/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp

Bug Summary

File:	tools/clang/lib/AST/ExprConstant.cpp
Warning:	line 11532, column 28 Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ExprConstant.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~svn373517/build-llvm/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn373517/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn373517/build-llvm/include -I /build/llvm-toolchain-snapshot-10~svn373517/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~svn373517/build-llvm/tools/clang/lib/AST -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~svn373517=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-10-02-234743-9763-1 -x c++ /build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp

/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp

→

1//===--- ExprConstant.cpp - Expression Constant Evaluator -----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Expr constant evaluator.
10//
11// Constant expression evaluation produces four main results:
12//
13//  * A success/failure flag indicating whether constant folding was successful.
14//    This is the 'bool' return value used by most of the code in this file. A
15//    'false' return value indicates that constant folding has failed, and any
16//    appropriate diagnostic has already been produced.
17//
18//  * An evaluated result, valid only if constant folding has not failed.
19//
20//  * A flag indicating if evaluation encountered (unevaluated) side-effects.
21//    These arise in cases such as (sideEffect(), 0) and (sideEffect() || 1),
22//    where it is possible to determine the evaluated result regardless.
23//
24//  * A set of notes indicating why the evaluation was not a constant expression
25//    (under the C++11 / C++1y rules only, at the moment), or, if folding failed
26//    too, why the expression could not be folded.
27//
28// If we are checking for a potential constant expression, failure to constant
29// fold a potential constant sub-expression will be indicated by a 'false'
30// return value (the expression could not be folded) and no diagnostic (the
31// expression is not necessarily non-constant).
32//
33//===----------------------------------------------------------------------===//

35#include <cstring>
36#include <functional>
37#include "Interp/Context.h"
38#include "Interp/Frame.h"
39#include "Interp/State.h"
40#include "clang/AST/APValue.h"
41#include "clang/AST/ASTContext.h"
42#include "clang/AST/ASTDiagnostic.h"
43#include "clang/AST/ASTLambda.h"
44#include "clang/AST/CXXInheritance.h"
45#include "clang/AST/CharUnits.h"
46#include "clang/AST/CurrentSourceLocExprScope.h"
47#include "clang/AST/Expr.h"
48#include "clang/AST/OSLog.h"
49#include "clang/AST/OptionalDiagnostic.h"
50#include "clang/AST/RecordLayout.h"
51#include "clang/AST/StmtVisitor.h"
52#include "clang/AST/TypeLoc.h"
53#include "clang/Basic/Builtins.h"
54#include "clang/Basic/FixedPoint.h"
55#include "clang/Basic/TargetInfo.h"
56#include "llvm/ADT/Optional.h"
57#include "llvm/ADT/SmallBitVector.h"
58#include "llvm/Support/SaveAndRestore.h"
59#include "llvm/Support/raw_ostream.h"

61#define DEBUG_TYPE"exprconstant" "exprconstant"

63using namespace clang;
64using llvm::APInt;
65using llvm::APSInt;
66using llvm::APFloat;
67using llvm::Optional;

69namespace {
struct LValue;
class CallStackFrame;
class EvalInfo;

using SourceLocExprScopeGuard =
    CurrentSourceLocExprScope::SourceLocExprScopeGuard;

static QualType getType(APValue::LValueBase B) {
  if (!B) return QualType();
  if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) {
    // FIXME: It's unclear where we're supposed to take the type from, and
    // this actually matters for arrays of unknown bound. Eg:
    //
    // extern int arr[]; void f() { extern int arr[3]; };
    // constexpr int *p = &arr[1]; // valid?
    //
    // For now, we take the array bound from the most recent declaration.
    for (auto *Redecl = cast<ValueDecl>(D->getMostRecentDecl()); Redecl;
         Redecl = cast_or_null<ValueDecl>(Redecl->getPreviousDecl())) {
      QualType T = Redecl->getType();
      if (!T->isIncompleteArrayType())
        return T;
    }
    return D->getType();
  }

  if (B.is<TypeInfoLValue>())
    return B.getTypeInfoType();

  if (B.is<DynamicAllocLValue>())
    return B.getDynamicAllocType();

  const Expr *Base = B.get<const Expr*>();

  // For a materialized temporary, the type of the temporary we materialized
  // may not be the type of the expression.
  if (const MaterializeTemporaryExpr *MTE =
          dyn_cast<MaterializeTemporaryExpr>(Base)) {
    SmallVector<const Expr *, 2> CommaLHSs;
    SmallVector<SubobjectAdjustment, 2> Adjustments;
    const Expr *Temp = MTE->GetTemporaryExpr();
    const Expr *Inner = Temp->skipRValueSubobjectAdjustments(CommaLHSs,
                                                             Adjustments);
    // Keep any cv-qualifiers from the reference if we generated a temporary
    // for it directly. Otherwise use the type after adjustment.
    if (!Adjustments.empty())
      return Inner->getType();
  }

  return Base->getType();
}

/// Get an LValue path entry, which is known to not be an array index, as a
/// field declaration.
static const FieldDecl *getAsField(APValue::LValuePathEntry E) {
  return dyn_cast_or_null<FieldDecl>(E.getAsBaseOrMember().getPointer());
}
/// Get an LValue path entry, which is known to not be an array index, as a
/// base class declaration.
static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) {
  return dyn_cast_or_null<CXXRecordDecl>(E.getAsBaseOrMember().getPointer());
}
/// Determine whether this LValue path entry for a base class names a virtual
/// base class.
static bool isVirtualBaseClass(APValue::LValuePathEntry E) {
  return E.getAsBaseOrMember().getInt();
}

/// Given an expression, determine the type used to store the result of
/// evaluating that expression.
static QualType getStorageType(ASTContext &Ctx, Expr *E) {
  if (E->isRValue())
    return E->getType();
  return Ctx.getLValueReferenceType(E->getType());
}

/// Given a CallExpr, try to get the alloc_size attribute. May return null.
static const AllocSizeAttr *getAllocSizeAttr(const CallExpr *CE) {
  const FunctionDecl *Callee = CE->getDirectCallee();
  return Callee ? Callee->getAttr<AllocSizeAttr>() : nullptr;
}

/// Attempts to unwrap a CallExpr (with an alloc_size attribute) from an Expr.
/// This will look through a single cast.
///
/// Returns null if we couldn't unwrap a function with alloc_size.
static const CallExpr *tryUnwrapAllocSizeCall(const Expr *E) {
  if (!E->getType()->isPointerType())
    return nullptr;

  E = E->IgnoreParens();
  // If we're doing a variable assignment from e.g. malloc(N), there will
  // probably be a cast of some kind. In exotic cases, we might also see a
  // top-level ExprWithCleanups. Ignore them either way.
  if (const auto *FE = dyn_cast<FullExpr>(E))
    E = FE->getSubExpr()->IgnoreParens();

  if (const auto *Cast = dyn_cast<CastExpr>(E))
    E = Cast->getSubExpr()->IgnoreParens();

  if (const auto *CE = dyn_cast<CallExpr>(E))
    return getAllocSizeAttr(CE) ? CE : nullptr;
  return nullptr;
}

/// Determines whether or not the given Base contains a call to a function
/// with the alloc_size attribute.
static bool isBaseAnAllocSizeCall(APValue::LValueBase Base) {
  const auto *E = Base.dyn_cast<const Expr *>();
  return E && E->getType()->isPointerType() && tryUnwrapAllocSizeCall(E);
}

/// The bound to claim that an array of unknown bound has.
/// The value in MostDerivedArraySize is undefined in this case. So, set it
/// to an arbitrary value that's likely to loudly break things if it's used.
static const uint64_t AssumedSizeForUnsizedArray =
    std::numeric_limits<uint64_t>::max() / 2;

/// Determines if an LValue with the given LValueBase will have an unsized
/// array in its designator.
/// Find the path length and type of the most-derived subobject in the given
/// path, and find the size of the containing array, if any.
static unsigned
findMostDerivedSubobject(ASTContext &Ctx, APValue::LValueBase Base,
                         ArrayRef<APValue::LValuePathEntry> Path,
                         uint64_t &ArraySize, QualType &Type, bool &IsArray,
                         bool &FirstEntryIsUnsizedArray) {
  // This only accepts LValueBases from APValues, and APValues don't support
  // arrays that lack size info.
  assert(!isBaseAnAllocSizeCall(Base) &&((!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here"
) ? static_cast<void> (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 200, __PRETTY_FUNCTION__))
         "Unsized arrays shouldn't appear here")((!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here"
) ? static_cast<void> (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 200, __PRETTY_FUNCTION__));
  unsigned MostDerivedLength = 0;
  Type = getType(Base);

  for (unsigned I = 0, N = Path.size(); I != N; ++I) {
    if (Type->isArrayType()) {
      const ArrayType *AT = Ctx.getAsArrayType(Type);
      Type = AT->getElementType();
      MostDerivedLength = I + 1;
      IsArray = true;

      if (auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
        ArraySize = CAT->getSize().getZExtValue();
      } else {
        assert(I == 0 && "unexpected unsized array designator")((I == 0 && "unexpected unsized array designator") ? static_cast
<void> (0) : __assert_fail ("I == 0 && \"unexpected unsized array designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 214, __PRETTY_FUNCTION__));
        FirstEntryIsUnsizedArray = true;
        ArraySize = AssumedSizeForUnsizedArray;
      }
    } else if (Type->isAnyComplexType()) {
      const ComplexType *CT = Type->castAs<ComplexType>();
      Type = CT->getElementType();
      ArraySize = 2;
      MostDerivedLength = I + 1;
      IsArray = true;
    } else if (const FieldDecl *FD = getAsField(Path[I])) {
      Type = FD->getType();
      ArraySize = 0;
      MostDerivedLength = I + 1;
      IsArray = false;
    } else {
      // Path[I] describes a base class.
      ArraySize = 0;
      IsArray = false;
    }
  }
  return MostDerivedLength;
}

/// A path from a glvalue to a subobject of that glvalue.
struct SubobjectDesignator {
  /// True if the subobject was named in a manner not supported by C++11. Such
  /// lvalues can still be folded, but they are not core constant expressions
  /// and we cannot perform lvalue-to-rvalue conversions on them.
  unsigned Invalid : 1;

  /// Is this a pointer one past the end of an object?
  unsigned IsOnePastTheEnd : 1;

  /// Indicator of whether the first entry is an unsized array.
  unsigned FirstEntryIsAnUnsizedArray : 1;

  /// Indicator of whether the most-derived object is an array element.
  unsigned MostDerivedIsArrayElement : 1;

  /// The length of the path to the most-derived object of which this is a
  /// subobject.
  unsigned MostDerivedPathLength : 28;

  /// The size of the array of which the most-derived object is an element.
  /// This will always be 0 if the most-derived object is not an array
  /// element. 0 is not an indicator of whether or not the most-derived object
  /// is an array, however, because 0-length arrays are allowed.
  ///
  /// If the current array is an unsized array, the value of this is
  /// undefined.
  uint64_t MostDerivedArraySize;

  /// The type of the most derived object referred to by this address.
  QualType MostDerivedType;

  typedef APValue::LValuePathEntry PathEntry;

  /// The entries on the path from the glvalue to the designated subobject.
  SmallVector<PathEntry, 8> Entries;

  SubobjectDesignator() : Invalid(true) {}

  explicit SubobjectDesignator(QualType T)
      : Invalid(false), IsOnePastTheEnd(false),
        FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false),
        MostDerivedPathLength(0), MostDerivedArraySize(0),
        MostDerivedType(T) {}

  SubobjectDesignator(ASTContext &Ctx, const APValue &V)
      : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false),
        FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false),
        MostDerivedPathLength(0), MostDerivedArraySize(0) {
    assert(V.isLValue() && "Non-LValue used to make an LValue designator?")((V.isLValue() && "Non-LValue used to make an LValue designator?"
) ? static_cast<void> (0) : __assert_fail ("V.isLValue() && \"Non-LValue used to make an LValue designator?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 287, __PRETTY_FUNCTION__));
    if (!Invalid) {
      IsOnePastTheEnd = V.isLValueOnePastTheEnd();
      ArrayRef<PathEntry> VEntries = V.getLValuePath();
      Entries.insert(Entries.end(), VEntries.begin(), VEntries.end());
      if (V.getLValueBase()) {
        bool IsArray = false;
        bool FirstIsUnsizedArray = false;
        MostDerivedPathLength = findMostDerivedSubobject(
            Ctx, V.getLValueBase(), V.getLValuePath(), MostDerivedArraySize,
            MostDerivedType, IsArray, FirstIsUnsizedArray);
        MostDerivedIsArrayElement = IsArray;
        FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray;
      }
    }
  }

  void truncate(ASTContext &Ctx, APValue::LValueBase Base,
                unsigned NewLength) {
    if (Invalid)
      return;

    assert(Base && "cannot truncate path for null pointer")((Base && "cannot truncate path for null pointer") ? static_cast
<void> (0) : __assert_fail ("Base && \"cannot truncate path for null pointer\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 309, __PRETTY_FUNCTION__));
    assert(NewLength <= Entries.size() && "not a truncation")((NewLength <= Entries.size() && "not a truncation"
) ? static_cast<void> (0) : __assert_fail ("NewLength <= Entries.size() && \"not a truncation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 310, __PRETTY_FUNCTION__));

    if (NewLength == Entries.size())
      return;
    Entries.resize(NewLength);

    bool IsArray = false;
    bool FirstIsUnsizedArray = false;
    MostDerivedPathLength = findMostDerivedSubobject(
        Ctx, Base, Entries, MostDerivedArraySize, MostDerivedType, IsArray,
        FirstIsUnsizedArray);
    MostDerivedIsArrayElement = IsArray;
    FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray;
  }

  void setInvalid() {
    Invalid = true;
    Entries.clear();
  }

  /// Determine whether the most derived subobject is an array without a
  /// known bound.
  bool isMostDerivedAnUnsizedArray() const {
    assert(!Invalid && "Calling this makes no sense on invalid designators")((!Invalid && "Calling this makes no sense on invalid designators"
) ? static_cast<void> (0) : __assert_fail ("!Invalid && \"Calling this makes no sense on invalid designators\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 333, __PRETTY_FUNCTION__));
    return Entries.size() == 1 && FirstEntryIsAnUnsizedArray;
  }

  /// Determine what the most derived array's size is. Results in an assertion
  /// failure if the most derived array lacks a size.
  uint64_t getMostDerivedArraySize() const {
    assert(!isMostDerivedAnUnsizedArray() && "Unsized array has no size")((!isMostDerivedAnUnsizedArray() && "Unsized array has no size"
) ? static_cast<void> (0) : __assert_fail ("!isMostDerivedAnUnsizedArray() && \"Unsized array has no size\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 340, __PRETTY_FUNCTION__));
    return MostDerivedArraySize;
  }

  /// Determine whether this is a one-past-the-end pointer.
  bool isOnePastTheEnd() const {
    assert(!Invalid)((!Invalid) ? static_cast<void> (0) : __assert_fail ("!Invalid"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 346, __PRETTY_FUNCTION__));
    if (IsOnePastTheEnd)
      return true;
    if (!isMostDerivedAnUnsizedArray() && MostDerivedIsArrayElement &&
        Entries[MostDerivedPathLength - 1].getAsArrayIndex() ==
            MostDerivedArraySize)
      return true;
    return false;
  }

  /// Get the range of valid index adjustments in the form
  ///   {maximum value that can be subtracted from this pointer,
  ///    maximum value that can be added to this pointer}
  std::pair<uint64_t, uint64_t> validIndexAdjustments() {
    if (Invalid || isMostDerivedAnUnsizedArray())
      return {0, 0};

    // [expr.add]p4: For the purposes of these operators, a pointer to a
    // nonarray object behaves the same as a pointer to the first element of
    // an array of length one with the type of the object as its element type.
    bool IsArray = MostDerivedPathLength == Entries.size() &&
                   MostDerivedIsArrayElement;
    uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex()
                                  : (uint64_t)IsOnePastTheEnd;
    uint64_t ArraySize =
        IsArray ? getMostDerivedArraySize() : (uint64_t)1;
    return {ArrayIndex, ArraySize - ArrayIndex};
  }

  /// Check that this refers to a valid subobject.
  bool isValidSubobject() const {
    if (Invalid)
      return false;
    return !isOnePastTheEnd();
  }
  /// Check that this refers to a valid subobject, and if not, produce a
  /// relevant diagnostic and set the designator as invalid.
  bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK);

  /// Get the type of the designated object.
  QualType getType(ASTContext &Ctx) const {
    assert(!Invalid && "invalid designator has no subobject type")((!Invalid && "invalid designator has no subobject type"
) ? static_cast<void> (0) : __assert_fail ("!Invalid && \"invalid designator has no subobject type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 387, __PRETTY_FUNCTION__));
    return MostDerivedPathLength == Entries.size()
               ? MostDerivedType
               : Ctx.getRecordType(getAsBaseClass(Entries.back()));
  }

  /// Update this designator to refer to the first element within this array.
  void addArrayUnchecked(const ConstantArrayType *CAT) {
    Entries.push_back(PathEntry::ArrayIndex(0));

    // This is a most-derived object.
    MostDerivedType = CAT->getElementType();
    MostDerivedIsArrayElement = true;
    MostDerivedArraySize = CAT->getSize().getZExtValue();
    MostDerivedPathLength = Entries.size();
  }
  /// Update this designator to refer to the first element within the array of
  /// elements of type T. This is an array of unknown size.
  void addUnsizedArrayUnchecked(QualType ElemTy) {
    Entries.push_back(PathEntry::ArrayIndex(0));

    MostDerivedType = ElemTy;
    MostDerivedIsArrayElement = true;
    // The value in MostDerivedArraySize is undefined in this case. So, set it
    // to an arbitrary value that's likely to loudly break things if it's
    // used.
    MostDerivedArraySize = AssumedSizeForUnsizedArray;
    MostDerivedPathLength = Entries.size();
  }
  /// Update this designator to refer to the given base or member of this
  /// object.
  void addDeclUnchecked(const Decl *D, bool Virtual = false) {
    Entries.push_back(APValue::BaseOrMemberType(D, Virtual));

    // If this isn't a base class, it's a new most-derived object.
    if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
      MostDerivedType = FD->getType();
      MostDerivedIsArrayElement = false;
      MostDerivedArraySize = 0;
      MostDerivedPathLength = Entries.size();
    }
  }
  /// Update this designator to refer to the given complex component.
  void addComplexUnchecked(QualType EltTy, bool Imag) {
    Entries.push_back(PathEntry::ArrayIndex(Imag));

    // This is technically a most-derived object, though in practice this
    // is unlikely to matter.
    MostDerivedType = EltTy;
    MostDerivedIsArrayElement = true;
    MostDerivedArraySize = 2;
    MostDerivedPathLength = Entries.size();
  }
  void diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info, const Expr *E);
  void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E,
                                 const APSInt &N);
  /// Add N to the address of this subobject.
  void adjustIndex(EvalInfo &Info, const Expr *E, APSInt N) {
    if (Invalid || !N) return;
    uint64_t TruncatedN = N.extOrTrunc(64).getZExtValue();
    if (isMostDerivedAnUnsizedArray()) {
      diagnoseUnsizedArrayPointerArithmetic(Info, E);
      // Can't verify -- trust that the user is doing the right thing (or if
      // not, trust that the caller will catch the bad behavior).
      // FIXME: Should we reject if this overflows, at least?
      Entries.back() = PathEntry::ArrayIndex(
          Entries.back().getAsArrayIndex() + TruncatedN);
      return;
    }

    // [expr.add]p4: For the purposes of these operators, a pointer to a
    // nonarray object behaves the same as a pointer to the first element of
    // an array of length one with the type of the object as its element type.
    bool IsArray = MostDerivedPathLength == Entries.size() &&
                   MostDerivedIsArrayElement;
    uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex()
                                  : (uint64_t)IsOnePastTheEnd;
    uint64_t ArraySize =
        IsArray ? getMostDerivedArraySize() : (uint64_t)1;

    if (N < -(int64_t)ArrayIndex || N > ArraySize - ArrayIndex) {
      // Calculate the actual index in a wide enough type, so we can include
      // it in the note.
      N = N.extend(std::max<unsigned>(N.getBitWidth() + 1, 65));
      (llvm::APInt&)N += ArrayIndex;
      assert(N.ugt(ArraySize) && "bounds check failed for in-bounds index")((N.ugt(ArraySize) && "bounds check failed for in-bounds index"
) ? static_cast<void> (0) : __assert_fail ("N.ugt(ArraySize) && \"bounds check failed for in-bounds index\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 472, __PRETTY_FUNCTION__));
      diagnosePointerArithmetic(Info, E, N);
      setInvalid();
      return;
    }

    ArrayIndex += TruncatedN;
    assert(ArrayIndex <= ArraySize &&((ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index"
) ? static_cast<void> (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 480, __PRETTY_FUNCTION__))
           "bounds check succeeded for out-of-bounds index")((ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index"
) ? static_cast<void> (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 480, __PRETTY_FUNCTION__));

    if (IsArray)
      Entries.back() = PathEntry::ArrayIndex(ArrayIndex);
    else
      IsOnePastTheEnd = (ArrayIndex != 0);
  }
};

/// A stack frame in the constexpr call stack.
class CallStackFrame : public interp::Frame {
public:
  EvalInfo &Info;

  /// Parent - The caller of this stack frame.
  CallStackFrame *Caller;

  /// Callee - The function which was called.
  const FunctionDecl *Callee;

  /// This - The binding for the this pointer in this call, if any.
  const LValue *This;

  /// Arguments - Parameter bindings for this function call, indexed by
  /// parameters' function scope indices.
  APValue *Arguments;

  /// Source location information about the default argument or default
  /// initializer expression we're evaluating, if any.
  CurrentSourceLocExprScope CurSourceLocExprScope;

  // Note that we intentionally use std::map here so that references to
  // values are stable.
  typedef std::pair<const void *, unsigned> MapKeyTy;
  typedef std::map<MapKeyTy, APValue> MapTy;
  /// Temporaries - Temporary lvalues materialized within this stack frame.
  MapTy Temporaries;

  /// CallLoc - The location of the call expression for this call.
  SourceLocation CallLoc;

  /// Index - The call index of this call.
  unsigned Index;

  /// The stack of integers for tracking version numbers for temporaries.
  SmallVector<unsigned, 2> TempVersionStack = {1};
  unsigned CurTempVersion = TempVersionStack.back();

  unsigned getTempVersion() const { return TempVersionStack.back(); }

  void pushTempVersion() {
    TempVersionStack.push_back(++CurTempVersion);
  }

  void popTempVersion() {
    TempVersionStack.pop_back();
  }

  // FIXME: Adding this to every 'CallStackFrame' may have a nontrivial impact
  // on the overall stack usage of deeply-recursing constexpr evaluations.
  // (We should cache this map rather than recomputing it repeatedly.)
  // But let's try this and see how it goes; we can look into caching the map
  // as a later change.

  /// LambdaCaptureFields - Mapping from captured variables/this to
  /// corresponding data members in the closure class.
  llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
  FieldDecl *LambdaThisCaptureField;

  CallStackFrame(EvalInfo &Info, SourceLocation CallLoc,
                 const FunctionDecl *Callee, const LValue *This,
                 APValue *Arguments);
  ~CallStackFrame();

  // Return the temporary for Key whose version number is Version.
  APValue *getTemporary(const void *Key, unsigned Version) {
    MapKeyTy KV(Key, Version);
    auto LB = Temporaries.lower_bound(KV);
    if (LB != Temporaries.end() && LB->first == KV)
      return &LB->second;
    // Pair (Key,Version) wasn't found in the map. Check that no elements
    // in the map have 'Key' as their key.
    assert((LB == Temporaries.end() || LB->first.first != Key) &&(((LB == Temporaries.end() || LB->first.first != Key) &&
 (LB == Temporaries.begin() || std::prev(LB)->first.first !=
 Key) && "Element with key 'Key' found in map") ? static_cast
<void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 564, __PRETTY_FUNCTION__))
           (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) &&(((LB == Temporaries.end() || LB->first.first != Key) &&
 (LB == Temporaries.begin() || std::prev(LB)->first.first !=
 Key) && "Element with key 'Key' found in map") ? static_cast
<void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 564, __PRETTY_FUNCTION__))
           "Element with key 'Key' found in map")(((LB == Temporaries.end() || LB->first.first != Key) &&
 (LB == Temporaries.begin() || std::prev(LB)->first.first !=
 Key) && "Element with key 'Key' found in map") ? static_cast
<void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 564, __PRETTY_FUNCTION__));
    return nullptr;
  }

  // Return the current temporary for Key in the map.
  APValue *getCurrentTemporary(const void *Key) {
    auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U)));
    if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key)
      return &std::prev(UB)->second;
    return nullptr;
  }

  // Return the version number of the current temporary for Key.
  unsigned getCurrentTemporaryVersion(const void *Key) const {
    auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U)));
    if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key)
      return std::prev(UB)->first.second;
    return 0;
  }

  /// Allocate storage for an object of type T in this stack frame.
  /// Populates LV with a handle to the created object. Key identifies
  /// the temporary within the stack frame, and must not be reused without
  /// bumping the temporary version number.
  template<typename KeyT>
  APValue &createTemporary(const KeyT *Key, QualType T,
                           bool IsLifetimeExtended, LValue &LV);

  void describe(llvm::raw_ostream &OS) override;

  Frame *getCaller() const override { return Caller; }
  SourceLocation getCallLocation() const override { return CallLoc; }
  const FunctionDecl *getCallee() const override { return Callee; }
};

/// Temporarily override 'this'.
class ThisOverrideRAII {
public:
  ThisOverrideRAII(CallStackFrame &Frame, const LValue *NewThis, bool Enable)
      : Frame(Frame), OldThis(Frame.This) {
    if (Enable)
      Frame.This = NewThis;
  }
  ~ThisOverrideRAII() {
    Frame.This = OldThis;
  }
private:
  CallStackFrame &Frame;
  const LValue *OldThis;
};
614}

616static bool HandleDestruction(EvalInfo &Info, const Expr *E,
                            const LValue &This, QualType ThisType);
618static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc,
                            APValue::LValueBase LVBase, APValue &Value,
                            QualType T);

622namespace {
/// A cleanup, and a flag indicating whether it is lifetime-extended.
class Cleanup {
  llvm::PointerIntPair<APValue*, 1, bool> Value;
  APValue::LValueBase Base;
  QualType T;

public:
  Cleanup(APValue *Val, APValue::LValueBase Base, QualType T,
          bool IsLifetimeExtended)
      : Value(Val, IsLifetimeExtended), Base(Base), T(T) {}

  bool isLifetimeExtended() const { return Value.getInt(); }
  bool endLifetime(EvalInfo &Info, bool RunDestructors) {
    if (RunDestructors) {
      SourceLocation Loc;
      if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>())
        Loc = VD->getLocation();
      else if (const Expr *E = Base.dyn_cast<const Expr*>())
        Loc = E->getExprLoc();
      return HandleDestruction(Info, Loc, Base, *Value.getPointer(), T);
    }
    *Value.getPointer() = APValue();
    return true;
  }

  bool hasSideEffect() {
    return T.isDestructedType();
  }
};

/// A reference to an object whose construction we are currently evaluating.
struct ObjectUnderConstruction {
  APValue::LValueBase Base;
  ArrayRef<APValue::LValuePathEntry> Path;
  friend bool operator==(const ObjectUnderConstruction &LHS,
                         const ObjectUnderConstruction &RHS) {
    return LHS.Base == RHS.Base && LHS.Path == RHS.Path;
  }
  friend llvm::hash_code hash_value(const ObjectUnderConstruction &Obj) {
    return llvm::hash_combine(Obj.Base, Obj.Path);
  }
};
enum class ConstructionPhase {
  None,
  Bases,
  AfterBases,
  Destroying,
  DestroyingBases
};
672}

674namespace llvm {
675template<> struct DenseMapInfo<ObjectUnderConstruction> {
using Base = DenseMapInfo<APValue::LValueBase>;
static ObjectUnderConstruction getEmptyKey() {
  return {Base::getEmptyKey(), {}}; }
static ObjectUnderConstruction getTombstoneKey() {
  return {Base::getTombstoneKey(), {}};
}
static unsigned getHashValue(const ObjectUnderConstruction &Object) {
  return hash_value(Object);
}
static bool isEqual(const ObjectUnderConstruction &LHS,
                    const ObjectUnderConstruction &RHS) {
  return LHS == RHS;
}
689};
690}

692namespace {
/// EvalInfo - This is a private struct used by the evaluator to capture
/// information about a subexpression as it is folded.  It retains information
/// about the AST context, but also maintains information about the folded
/// expression.
///
/// If an expression could be evaluated, it is still possible it is not a C
/// "integer constant expression" or constant expression.  If not, this struct
/// captures information about how and why not.
///
/// One bit of information passed *into* the request for constant folding
/// indicates whether the subexpression is "evaluated" or not according to C
/// rules.  For example, the RHS of (0 && foo()) is not evaluated.  We can
/// evaluate the expression regardless of what the RHS is, but C only allows
/// certain things in certain situations.
class EvalInfo : public interp::State {
public:
  ASTContext &Ctx;

  /// EvalStatus - Contains information about the evaluation.
  Expr::EvalStatus &EvalStatus;

  /// CurrentCall - The top of the constexpr call stack.
  CallStackFrame *CurrentCall;

  /// CallStackDepth - The number of calls in the call stack right now.
  unsigned CallStackDepth;

  /// NextCallIndex - The next call index to assign.
  unsigned NextCallIndex;

  /// StepsLeft - The remaining number of evaluation steps we're permitted
  /// to perform. This is essentially a limit for the number of statements
  /// we will evaluate.
  unsigned StepsLeft;

  /// Force the use of the experimental new constant interpreter, bailing out
  /// with an error if a feature is not supported.
  bool ForceNewConstInterp;

  /// Enable the experimental new constant interpreter.
  bool EnableNewConstInterp;

  /// BottomFrame - The frame in which evaluation started. This must be
  /// initialized after CurrentCall and CallStackDepth.
  CallStackFrame BottomFrame;

  /// A stack of values whose lifetimes end at the end of some surrounding
  /// evaluation frame.
  llvm::SmallVector<Cleanup, 16> CleanupStack;

  /// EvaluatingDecl - This is the declaration whose initializer is being
  /// evaluated, if any.
  APValue::LValueBase EvaluatingDecl;

  enum class EvaluatingDeclKind {
    None,
    /// We're evaluating the construction of EvaluatingDecl.
    Ctor,
    /// We're evaluating the destruction of EvaluatingDecl.
    Dtor,
  };
  EvaluatingDeclKind IsEvaluatingDecl = EvaluatingDeclKind::None;

  /// EvaluatingDeclValue - This is the value being constructed for the
  /// declaration whose initializer is being evaluated, if any.
  APValue *EvaluatingDeclValue;

  /// Set of objects that are currently being constructed.
  llvm::DenseMap<ObjectUnderConstruction, ConstructionPhase>
      ObjectsUnderConstruction;

  /// A dynamically-allocated heap object.
  struct DynAlloc {
    /// The value of this heap-allocated object.
    APValue Value;
    /// The allocating expression; used for diagnostics.
    const Expr *AllocExpr = nullptr;
  };

  struct DynAllocOrder {
    bool operator()(DynamicAllocLValue L, DynamicAllocLValue R) const {
      return L.getIndex() < R.getIndex();
    }
  };

  /// Current heap allocations, along with the location where each was
  /// allocated. We use std::map here because we need stable addresses
  /// for the stored APValues.
  std::map<DynamicAllocLValue, DynAlloc, DynAllocOrder> HeapAllocs;

  /// The number of heap allocations performed so far in this evaluation.
  unsigned NumHeapAllocs = 0;

  struct EvaluatingConstructorRAII {
    EvalInfo &EI;
    ObjectUnderConstruction Object;
    bool DidInsert;
    EvaluatingConstructorRAII(EvalInfo &EI, ObjectUnderConstruction Object,
                              bool HasBases)
        : EI(EI), Object(Object) {
      DidInsert =
          EI.ObjectsUnderConstruction
              .insert({Object, HasBases ? ConstructionPhase::Bases
                                        : ConstructionPhase::AfterBases})
              .second;
    }
    void finishedConstructingBases() {
      EI.ObjectsUnderConstruction[Object] = ConstructionPhase::AfterBases;
    }
    ~EvaluatingConstructorRAII() {
      if (DidInsert) EI.ObjectsUnderConstruction.erase(Object);
    }
  };

  struct EvaluatingDestructorRAII {
    EvalInfo &EI;
    ObjectUnderConstruction Object;
    bool DidInsert;
    EvaluatingDestructorRAII(EvalInfo &EI, ObjectUnderConstruction Object)
        : EI(EI), Object(Object) {
      DidInsert = EI.ObjectsUnderConstruction
                      .insert({Object, ConstructionPhase::Destroying})
                      .second;
    }
    void startedDestroyingBases() {
      EI.ObjectsUnderConstruction[Object] =
          ConstructionPhase::DestroyingBases;
    }
    ~EvaluatingDestructorRAII() {
      if (DidInsert)
        EI.ObjectsUnderConstruction.erase(Object);
    }
  };

  ConstructionPhase
  isEvaluatingCtorDtor(APValue::LValueBase Base,
                       ArrayRef<APValue::LValuePathEntry> Path) {
    return ObjectsUnderConstruction.lookup({Base, Path});
  }

  /// If we're currently speculatively evaluating, the outermost call stack
  /// depth at which we can mutate state, otherwise 0.
  unsigned SpeculativeEvaluationDepth = 0;

  /// The current array initialization index, if we're performing array
  /// initialization.
  uint64_t ArrayInitIndex = -1;

  /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further
  /// notes attached to it will also be stored, otherwise they will not be.
  bool HasActiveDiagnostic;

  /// Have we emitted a diagnostic explaining why we couldn't constant
  /// fold (not just why it's not strictly a constant expression)?
  bool HasFoldFailureDiagnostic;

  /// Whether or not we're in a context where the front end requires a
  /// constant value.
  bool InConstantContext;

  /// Whether we're checking that an expression is a potential constant
  /// expression. If so, do not fail on constructs that could become constant
  /// later on (such as a use of an undefined global).
  bool CheckingPotentialConstantExpression = false;

  /// Whether we're checking for an expression that has undefined behavior.
  /// If so, we will produce warnings if we encounter an operation that is
  /// always undefined.
  bool CheckingForUndefinedBehavior = false;

  enum EvaluationMode {
    /// Evaluate as a constant expression. Stop if we find that the expression
    /// is not a constant expression.
    EM_ConstantExpression,

    /// Evaluate as a constant expression. Stop if we find that the expression
    /// is not a constant expression. Some expressions can be retried in the
    /// optimizer if we don't constant fold them here, but in an unevaluated
    /// context we try to fold them immediately since the optimizer never
    /// gets a chance to look at it.
    EM_ConstantExpressionUnevaluated,

    /// Fold the expression to a constant. Stop if we hit a side-effect that
    /// we can't model.
    EM_ConstantFold,

    /// Evaluate in any way we know how. Don't worry about side-effects that
    /// can't be modeled.
    EM_IgnoreSideEffects,
  } EvalMode;

  /// Are we checking whether the expression is a potential constant
  /// expression?
  bool checkingPotentialConstantExpression() const override  {
    return CheckingPotentialConstantExpression;
  }

  /// Are we checking an expression for overflow?
  // FIXME: We should check for any kind of undefined or suspicious behavior
  // in such constructs, not just overflow.
  bool checkingForUndefinedBehavior() const override {
    return CheckingForUndefinedBehavior;
  }

  EvalInfo(const ASTContext &C, Expr::EvalStatus &S, EvaluationMode Mode)
      : Ctx(const_cast<ASTContext &>(C)), EvalStatus(S), CurrentCall(nullptr),
        CallStackDepth(0), NextCallIndex(1),
        StepsLeft(getLangOpts().ConstexprStepLimit),
        ForceNewConstInterp(getLangOpts().ForceNewConstInterp),
        EnableNewConstInterp(ForceNewConstInterp ||
                             getLangOpts().EnableNewConstInterp),
        BottomFrame(*this, SourceLocation(), nullptr, nullptr, nullptr),
        EvaluatingDecl((const ValueDecl *)nullptr),
        EvaluatingDeclValue(nullptr), HasActiveDiagnostic(false),
        HasFoldFailureDiagnostic(false), InConstantContext(false),
        EvalMode(Mode) {}

  ~EvalInfo() {
    discardCleanups();
  }

  void setEvaluatingDecl(APValue::LValueBase Base, APValue &Value,
                         EvaluatingDeclKind EDK = EvaluatingDeclKind::Ctor) {
    EvaluatingDecl = Base;
    IsEvaluatingDecl = EDK;
    EvaluatingDeclValue = &Value;
  }

  bool CheckCallLimit(SourceLocation Loc) {
    // Don't perform any constexpr calls (other than the call we're checking)
    // when checking a potential constant expression.
    if (checkingPotentialConstantExpression() && CallStackDepth > 1)
      return false;
    if (NextCallIndex == 0) {
      // NextCallIndex has wrapped around.
      FFDiag(Loc, diag::note_constexpr_call_limit_exceeded);
      return false;
    }
    if (CallStackDepth <= getLangOpts().ConstexprCallDepth)
      return true;
    FFDiag(Loc, diag::note_constexpr_depth_limit_exceeded)
      << getLangOpts().ConstexprCallDepth;
    return false;
  }

  std::pair<CallStackFrame *, unsigned>
  getCallFrameAndDepth(unsigned CallIndex) {
    assert(CallIndex && "no call index in getCallFrameAndDepth")((CallIndex && "no call index in getCallFrameAndDepth"
) ? static_cast<void> (0) : __assert_fail ("CallIndex && \"no call index in getCallFrameAndDepth\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 940, __PRETTY_FUNCTION__));
    // We will eventually hit BottomFrame, which has Index 1, so Frame can't
    // be null in this loop.
    unsigned Depth = CallStackDepth;
    CallStackFrame *Frame = CurrentCall;
    while (Frame->Index > CallIndex) {
      Frame = Frame->Caller;
      --Depth;
    }
    if (Frame->Index == CallIndex)
      return {Frame, Depth};
    return {nullptr, 0};
  }

  bool nextStep(const Stmt *S) {
    if (!StepsLeft) {
      FFDiag(S->getBeginLoc(), diag::note_constexpr_step_limit_exceeded);
      return false;
    }
    --StepsLeft;
    return true;
  }

  APValue *createHeapAlloc(const Expr *E, QualType T, LValue &LV);

  Optional<DynAlloc*> lookupDynamicAlloc(DynamicAllocLValue DA) {
    Optional<DynAlloc*> Result;
    auto It = HeapAllocs.find(DA);
    if (It != HeapAllocs.end())
      Result = &It->second;
    return Result;
  }

  void performLifetimeExtension() {
    // Disable the cleanups for lifetime-extended temporaries.
    CleanupStack.erase(
        std::remove_if(CleanupStack.begin(), CleanupStack.end(),
                       [](Cleanup &C) { return C.isLifetimeExtended(); }),
        CleanupStack.end());
   }

  /// Throw away any remaining cleanups at the end of evaluation. If any
  /// cleanups would have had a side-effect, note that as an unmodeled
  /// side-effect and return false. Otherwise, return true.
  bool discardCleanups() {
    for (Cleanup &C : CleanupStack)
      if (C.hasSideEffect())
        if (!noteSideEffect())
          return false;
    return true;
  }

private:
  interp::Frame *getCurrentFrame() override { return CurrentCall; }
  const interp::Frame *getBottomFrame() const override { return &BottomFrame; }

  bool hasActiveDiagnostic() override { return HasActiveDiagnostic; }
  void setActiveDiagnostic(bool Flag) override { HasActiveDiagnostic = Flag; }

  void setFoldFailureDiagnostic(bool Flag) override {
    HasFoldFailureDiagnostic = Flag;
  }

  Expr::EvalStatus &getEvalStatus() const override { return EvalStatus; }

  ASTContext &getCtx() const override { return Ctx; }

  // If we have a prior diagnostic, it will be noting that the expression
  // isn't a constant expression. This diagnostic is more important,
  // unless we require this evaluation to produce a constant expression.
  //
  // FIXME: We might want to show both diagnostics to the user in
  // EM_ConstantFold mode.
  bool hasPriorDiagnostic() override {
    if (!EvalStatus.Diag->empty()) {
      switch (EvalMode) {
      case EM_ConstantFold:
      case EM_IgnoreSideEffects:
        if (!HasFoldFailureDiagnostic)
          break;
        // We've already failed to fold something. Keep that diagnostic.
        LLVM_FALLTHROUGH[[gnu::fallthrough]];
      case EM_ConstantExpression:
      case EM_ConstantExpressionUnevaluated:
        setActiveDiagnostic(false);
        return true;
      }
    }
    return false;
  }

  unsigned getCallStackDepth() override { return CallStackDepth; }

public:
  /// Should we continue evaluation after encountering a side-effect that we
  /// couldn't model?
  bool keepEvaluatingAfterSideEffect() {
    switch (EvalMode) {
    case EM_IgnoreSideEffects:
      return true;

    case EM_ConstantExpression:
    case EM_ConstantExpressionUnevaluated:
    case EM_ConstantFold:
      // By default, assume any side effect might be valid in some other
      // evaluation of this expression from a different context.
      return checkingPotentialConstantExpression() ||
             checkingForUndefinedBehavior();
    }
    llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1049);
  }

  /// Note that we have had a side-effect, and determine whether we should
  /// keep evaluating.
  bool noteSideEffect() {
    EvalStatus.HasSideEffects = true;
    return keepEvaluatingAfterSideEffect();
  }

  /// Should we continue evaluation after encountering undefined behavior?
  bool keepEvaluatingAfterUndefinedBehavior() {
    switch (EvalMode) {
    case EM_IgnoreSideEffects:
    case EM_ConstantFold:
      return true;

    case EM_ConstantExpression:
    case EM_ConstantExpressionUnevaluated:
      return checkingForUndefinedBehavior();
    }
    llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1070);
  }

  /// Note that we hit something that was technically undefined behavior, but
  /// that we can evaluate past it (such as signed overflow or floating-point
  /// division by zero.)
  bool noteUndefinedBehavior() override {
    EvalStatus.HasUndefinedBehavior = true;
    return keepEvaluatingAfterUndefinedBehavior();
  }

  /// Should we continue evaluation as much as possible after encountering a
  /// construct which can't be reduced to a value?
  bool keepEvaluatingAfterFailure() const override {
    if (!StepsLeft)
      return false;

    switch (EvalMode) {
    case EM_ConstantExpression:
    case EM_ConstantExpressionUnevaluated:
    case EM_ConstantFold:
    case EM_IgnoreSideEffects:
      return checkingPotentialConstantExpression() ||
             checkingForUndefinedBehavior();
    }
    llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1095);
  }

  /// Notes that we failed to evaluate an expression that other expressions
  /// directly depend on, and determine if we should keep evaluating. This
  /// should only be called if we actually intend to keep evaluating.
  ///
  /// Call noteSideEffect() instead if we may be able to ignore the value that
  /// we failed to evaluate, e.g. if we failed to evaluate Foo() in:
  ///
  /// (Foo(), 1)      // use noteSideEffect
  /// (Foo() || true) // use noteSideEffect
  /// Foo() + 1       // use noteFailure
  LLVM_NODISCARD[[clang::warn_unused_result]] bool noteFailure() {
    // Failure when evaluating some expression often means there is some
    // subexpression whose evaluation was skipped. Therefore, (because we
    // don't track whether we skipped an expression when unwinding after an
    // evaluation failure) every evaluation failure that bubbles up from a
    // subexpression implies that a side-effect has potentially happened. We
    // skip setting the HasSideEffects flag to true until we decide to
    // continue evaluating after that point, which happens here.
    bool KeepGoing = keepEvaluatingAfterFailure();
    EvalStatus.HasSideEffects |= KeepGoing;
    return KeepGoing;
  }

  class ArrayInitLoopIndex {
    EvalInfo &Info;
    uint64_t OuterIndex;

  public:
    ArrayInitLoopIndex(EvalInfo &Info)
        : Info(Info), OuterIndex(Info.ArrayInitIndex) {
      Info.ArrayInitIndex = 0;
    }
    ~ArrayInitLoopIndex() { Info.ArrayInitIndex = OuterIndex; }

    operator uint64_t&() { return Info.ArrayInitIndex; }
  };
};

/// Object used to treat all foldable expressions as constant expressions.
struct FoldConstant {
  EvalInfo &Info;
  bool Enabled;
  bool HadNoPriorDiags;
  EvalInfo::EvaluationMode OldMode;

  explicit FoldConstant(EvalInfo &Info, bool Enabled)
    : Info(Info),
      Enabled(Enabled),
      HadNoPriorDiags(Info.EvalStatus.Diag &&
                      Info.EvalStatus.Diag->empty() &&
                      !Info.EvalStatus.HasSideEffects),
      OldMode(Info.EvalMode) {
    if (Enabled)
      Info.EvalMode = EvalInfo::EM_ConstantFold;
  }
  void keepDiagnostics() { Enabled = false; }
  ~FoldConstant() {
    if (Enabled && HadNoPriorDiags && !Info.EvalStatus.Diag->empty() &&
        !Info.EvalStatus.HasSideEffects)
      Info.EvalStatus.Diag->clear();
    Info.EvalMode = OldMode;
  }
};

/// RAII object used to set the current evaluation mode to ignore
/// side-effects.
struct IgnoreSideEffectsRAII {
  EvalInfo &Info;
  EvalInfo::EvaluationMode OldMode;
  explicit IgnoreSideEffectsRAII(EvalInfo &Info)
      : Info(Info), OldMode(Info.EvalMode) {
    Info.EvalMode = EvalInfo::EM_IgnoreSideEffects;
  }

  ~IgnoreSideEffectsRAII() { Info.EvalMode = OldMode; }
};

/// RAII object used to optionally suppress diagnostics and side-effects from
/// a speculative evaluation.
class SpeculativeEvaluationRAII {
  EvalInfo *Info = nullptr;
  Expr::EvalStatus OldStatus;
  unsigned OldSpeculativeEvaluationDepth;

  void moveFromAndCancel(SpeculativeEvaluationRAII &&Other) {
    Info = Other.Info;
    OldStatus = Other.OldStatus;
    OldSpeculativeEvaluationDepth = Other.OldSpeculativeEvaluationDepth;
    Other.Info = nullptr;
  }

  void maybeRestoreState() {
    if (!Info)
      return;

    Info->EvalStatus = OldStatus;
    Info->SpeculativeEvaluationDepth = OldSpeculativeEvaluationDepth;
  }

public:
  SpeculativeEvaluationRAII() = default;

  SpeculativeEvaluationRAII(
      EvalInfo &Info, SmallVectorImpl<PartialDiagnosticAt> *NewDiag = nullptr)
      : Info(&Info), OldStatus(Info.EvalStatus),
        OldSpeculativeEvaluationDepth(Info.SpeculativeEvaluationDepth) {
    Info.EvalStatus.Diag = NewDiag;
    Info.SpeculativeEvaluationDepth = Info.CallStackDepth + 1;
  }

  SpeculativeEvaluationRAII(const SpeculativeEvaluationRAII &Other) = delete;
  SpeculativeEvaluationRAII(SpeculativeEvaluationRAII &&Other) {
    moveFromAndCancel(std::move(Other));
  }

  SpeculativeEvaluationRAII &operator=(SpeculativeEvaluationRAII &&Other) {
    maybeRestoreState();
    moveFromAndCancel(std::move(Other));
    return *this;
  }

  ~SpeculativeEvaluationRAII() { maybeRestoreState(); }
};

/// RAII object wrapping a full-expression or block scope, and handling
/// the ending of the lifetime of temporaries created within it.
template<bool IsFullExpression>
class ScopeRAII {
  EvalInfo &Info;
  unsigned OldStackSize;
public:
  ScopeRAII(EvalInfo &Info)
      : Info(Info), OldStackSize(Info.CleanupStack.size()) {
    // Push a new temporary version. This is needed to distinguish between
    // temporaries created in different iterations of a loop.
    Info.CurrentCall->pushTempVersion();
  }
  bool destroy(bool RunDestructors = true) {
    bool OK = cleanup(Info, RunDestructors, OldStackSize);
    OldStackSize = -1U;
    return OK;
  }
  ~ScopeRAII() {
    if (OldStackSize != -1U)
      destroy(false);
    // Body moved to a static method to encourage the compiler to inline away
    // instances of this class.
    Info.CurrentCall->popTempVersion();
  }
private:
  static bool cleanup(EvalInfo &Info, bool RunDestructors,
                      unsigned OldStackSize) {
    assert(OldStackSize <= Info.CleanupStack.size() &&((OldStackSize <= Info.CleanupStack.size() && "running cleanups out of order?"
) ? static_cast<void> (0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1251, __PRETTY_FUNCTION__))
           "running cleanups out of order?")((OldStackSize <= Info.CleanupStack.size() && "running cleanups out of order?"
) ? static_cast<void> (0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1251, __PRETTY_FUNCTION__));

    // Run all cleanups for a block scope, and non-lifetime-extended cleanups
    // for a full-expression scope.
    bool Success = true;
    for (unsigned I = Info.CleanupStack.size(); I > OldStackSize; --I) {
      if (!(IsFullExpression &&
            Info.CleanupStack[I - 1].isLifetimeExtended())) {
        if (!Info.CleanupStack[I - 1].endLifetime(Info, RunDestructors)) {
          Success = false;
          break;
        }
      }
    }

    // Compact lifetime-extended cleanups.
    auto NewEnd = Info.CleanupStack.begin() + OldStackSize;
    if (IsFullExpression)
      NewEnd =
          std::remove_if(NewEnd, Info.CleanupStack.end(),
                         [](Cleanup &C) { return !C.isLifetimeExtended(); });
    Info.CleanupStack.erase(NewEnd, Info.CleanupStack.end());
    return Success;
  }
};
typedef ScopeRAII<false> BlockScopeRAII;
typedef ScopeRAII<true> FullExpressionRAII;
1278}

1280bool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E,
                                       CheckSubobjectKind CSK) {
if (Invalid)
  return false;
if (isOnePastTheEnd()) {
  Info.CCEDiag(E, diag::note_constexpr_past_end_subobject)
    << CSK;
  setInvalid();
  return false;
}
// Note, we do not diagnose if isMostDerivedAnUnsizedArray(), because there
// must actually be at least one array element; even a VLA cannot have a
// bound of zero. And if our index is nonzero, we already had a CCEDiag.
return true;
1294}

1296void SubobjectDesignator::diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info,
                                                              const Expr *E) {
Info.CCEDiag(E, diag::note_constexpr_unsized_array_indexed);
// Do not set the designator as invalid: we can represent this situation,
// and correct handling of __builtin_object_size requires us to do so.
1301}

1303void SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info,
                                                  const Expr *E,
                                                  const APSInt &N) {
// If we're complaining, we must be able to statically determine the size of
// the most derived array.
if (MostDerivedPathLength == Entries.size() && MostDerivedIsArrayElement)
  Info.CCEDiag(E, diag::note_constexpr_array_index)
    << N << /*array*/ 0
    << static_cast<unsigned>(getMostDerivedArraySize());
else
  Info.CCEDiag(E, diag::note_constexpr_array_index)
    << N << /*non-array*/ 1;
setInvalid();
1316}

1318CallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc,
                             const FunctionDecl *Callee, const LValue *This,
                             APValue *Arguments)
  : Info(Info), Caller(Info.CurrentCall), Callee(Callee), This(This),
    Arguments(Arguments), CallLoc(CallLoc), Index(Info.NextCallIndex++) {
Info.CurrentCall = this;
++Info.CallStackDepth;
1325}

1327CallStackFrame::~CallStackFrame() {
assert(Info.CurrentCall == this && "calls retired out of order")((Info.CurrentCall == this && "calls retired out of order"
) ? static_cast<void> (0) : __assert_fail ("Info.CurrentCall == this && \"calls retired out of order\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1328, __PRETTY_FUNCTION__));
--Info.CallStackDepth;
Info.CurrentCall = Caller;
1331}

1333static bool isRead(AccessKinds AK) {
return AK == AK_Read || AK == AK_ReadObjectRepresentation;
1335}

1337static bool isModification(AccessKinds AK) {
switch (AK) {
case AK_Read:
case AK_ReadObjectRepresentation:
case AK_MemberCall:
case AK_DynamicCast:
case AK_TypeId:
  return false;
case AK_Assign:
case AK_Increment:
case AK_Decrement:
case AK_Destroy:
  return true;
}
llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1351);
1352}

1354static bool isAnyAccess(AccessKinds AK) {
return isRead(AK) || isModification(AK);
1356}

1358/// Is this an access per the C++ definition?
1359static bool isFormalAccess(AccessKinds AK) {
return isAnyAccess(AK) && AK != AK_Destroy;
1361}

1363namespace {
struct ComplexValue {
private:
  bool IsInt;

public:
  APSInt IntReal, IntImag;
  APFloat FloatReal, FloatImag;

  ComplexValue() : FloatReal(APFloat::Bogus()), FloatImag(APFloat::Bogus()) {}

  void makeComplexFloat() { IsInt = false; }
  bool isComplexFloat() const { return !IsInt; }
  APFloat &getComplexFloatReal() { return FloatReal; }
  APFloat &getComplexFloatImag() { return FloatImag; }

  void makeComplexInt() { IsInt = true; }
  bool isComplexInt() const { return IsInt; }
  APSInt &getComplexIntReal() { return IntReal; }
  APSInt &getComplexIntImag() { return IntImag; }

  void moveInto(APValue &v) const {
    if (isComplexFloat())
      v = APValue(FloatReal, FloatImag);
    else
      v = APValue(IntReal, IntImag);
  }
  void setFrom(const APValue &v) {
    assert(v.isComplexFloat() || v.isComplexInt())((v.isComplexFloat() || v.isComplexInt()) ? static_cast<void
> (0) : __assert_fail ("v.isComplexFloat() || v.isComplexInt()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1391, __PRETTY_FUNCTION__));
    if (v.isComplexFloat()) {
      makeComplexFloat();
      FloatReal = v.getComplexFloatReal();
      FloatImag = v.getComplexFloatImag();
    } else {
      makeComplexInt();
      IntReal = v.getComplexIntReal();
      IntImag = v.getComplexIntImag();
    }
  }
};

struct LValue {
  APValue::LValueBase Base;
  CharUnits Offset;
  SubobjectDesignator Designator;
  bool IsNullPtr : 1;
  bool InvalidBase : 1;

  const APValue::LValueBase getLValueBase() const { return Base; }
  CharUnits &getLValueOffset() { return Offset; }
  const CharUnits &getLValueOffset() const { return Offset; }
  SubobjectDesignator &getLValueDesignator() { return Designator; }
  const SubobjectDesignator &getLValueDesignator() const { return Designator;}
  bool isNullPointer() const { return IsNullPtr;}

  unsigned getLValueCallIndex() const { return Base.getCallIndex(); }
  unsigned getLValueVersion() const { return Base.getVersion(); }

  void moveInto(APValue &V) const {
    if (Designator.Invalid)
      V = APValue(Base, Offset, APValue::NoLValuePath(), IsNullPtr);
    else {
      assert(!InvalidBase && "APValues can't handle invalid LValue bases")((!InvalidBase && "APValues can't handle invalid LValue bases"
) ? static_cast<void> (0) : __assert_fail ("!InvalidBase && \"APValues can't handle invalid LValue bases\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1425, __PRETTY_FUNCTION__));
      V = APValue(Base, Offset, Designator.Entries,
                  Designator.IsOnePastTheEnd, IsNullPtr);
    }
  }
  void setFrom(ASTContext &Ctx, const APValue &V) {
    assert(V.isLValue() && "Setting LValue from a non-LValue?")((V.isLValue() && "Setting LValue from a non-LValue?"
) ? static_cast<void> (0) : __assert_fail ("V.isLValue() && \"Setting LValue from a non-LValue?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1431, __PRETTY_FUNCTION__));
    Base = V.getLValueBase();
    Offset = V.getLValueOffset();
    InvalidBase = false;
    Designator = SubobjectDesignator(Ctx, V);
    IsNullPtr = V.isNullPointer();
  }

  void set(APValue::LValueBase B, bool BInvalid = false) {
1440#ifndef NDEBUG
    // We only allow a few types of invalid bases. Enforce that here.
    if (BInvalid) {
      const auto *E = B.get<const Expr *>();
      assert((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) &&(((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) &&
 "Unexpected type of invalid base") ? static_cast<void>
 (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1445, __PRETTY_FUNCTION__))
             "Unexpected type of invalid base")(((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) &&
 "Unexpected type of invalid base") ? static_cast<void>
 (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1445, __PRETTY_FUNCTION__));
    }
1447#endif

    Base = B;
    Offset = CharUnits::fromQuantity(0);
    InvalidBase = BInvalid;
    Designator = SubobjectDesignator(getType(B));
    IsNullPtr = false;
  }

  void setNull(QualType PointerTy, uint64_t TargetVal) {
    Base = (Expr *)nullptr;
    Offset = CharUnits::fromQuantity(TargetVal);
    InvalidBase = false;
    Designator = SubobjectDesignator(PointerTy->getPointeeType());
    IsNullPtr = true;
  }

  void setInvalid(APValue::LValueBase B, unsigned I = 0) {
    set(B, true);
  }

private:
  // Check that this LValue is not based on a null pointer. If it is, produce
  // a diagnostic and mark the designator as invalid.
  template <typename GenDiagType>
  bool checkNullPointerDiagnosingWith(const GenDiagType &GenDiag) {
    if (Designator.Invalid)
      return false;
    if (IsNullPtr) {
      GenDiag();
      Designator.setInvalid();
      return false;
    }
    return true;
  }

public:
  bool checkNullPointer(EvalInfo &Info, const Expr *E,
                        CheckSubobjectKind CSK) {
    return checkNullPointerDiagnosingWith([&Info, E, CSK] {
      Info.CCEDiag(E, diag::note_constexpr_null_subobject) << CSK;
    });
  }

  bool checkNullPointerForFoldAccess(EvalInfo &Info, const Expr *E,
                                     AccessKinds AK) {
    return checkNullPointerDiagnosingWith([&Info, E, AK] {
      Info.FFDiag(E, diag::note_constexpr_access_null) << AK;
    });
  }

  // Check this LValue refers to an object. If not, set the designator to be
  // invalid and emit a diagnostic.
  bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) {
    return (CSK == CSK_ArrayToPointer || checkNullPointer(Info, E, CSK)) &&
           Designator.checkSubobject(Info, E, CSK);
  }

  void addDecl(EvalInfo &Info, const Expr *E,
               const Decl *D, bool Virtual = false) {
    if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base))
      Designator.addDeclUnchecked(D, Virtual);
  }
  void addUnsizedArray(EvalInfo &Info, const Expr *E, QualType ElemTy) {
    if (!Designator.Entries.empty()) {
      Info.CCEDiag(E, diag::note_constexpr_unsupported_unsized_array);
      Designator.setInvalid();
      return;
    }
    if (checkSubobject(Info, E, CSK_ArrayToPointer)) {
      assert(getType(Base)->isPointerType() || getType(Base)->isArrayType())((getType(Base)->isPointerType() || getType(Base)->isArrayType
()) ? static_cast<void> (0) : __assert_fail ("getType(Base)->isPointerType() || getType(Base)->isArrayType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1517, __PRETTY_FUNCTION__));
      Designator.FirstEntryIsAnUnsizedArray = true;
      Designator.addUnsizedArrayUnchecked(ElemTy);
    }
  }
  void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) {
    if (checkSubobject(Info, E, CSK_ArrayToPointer))
      Designator.addArrayUnchecked(CAT);
  }
  void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) {
    if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real))
      Designator.addComplexUnchecked(EltTy, Imag);
  }
  void clearIsNullPointer() {
    IsNullPtr = false;
  }
  void adjustOffsetAndIndex(EvalInfo &Info, const Expr *E,
                            const APSInt &Index, CharUnits ElementSize) {
    // An index of 0 has no effect. (In C, adding 0 to a null pointer is UB,
    // but we're not required to diagnose it and it's valid in C++.)
    if (!Index)
      return;

    // Compute the new offset in the appropriate width, wrapping at 64 bits.
    // FIXME: When compiling for a 32-bit target, we should use 32-bit
    // offsets.
    uint64_t Offset64 = Offset.getQuantity();
    uint64_t ElemSize64 = ElementSize.getQuantity();
    uint64_t Index64 = Index.extOrTrunc(64).getZExtValue();
    Offset = CharUnits::fromQuantity(Offset64 + ElemSize64 * Index64);

    if (checkNullPointer(Info, E, CSK_ArrayIndex))
      Designator.adjustIndex(Info, E, Index);
    clearIsNullPointer();
  }
  void adjustOffset(CharUnits N) {
    Offset += N;
    if (N.getQuantity())
      clearIsNullPointer();
  }
};

struct MemberPtr {
  MemberPtr() {}
  explicit MemberPtr(const ValueDecl *Decl) :
    DeclAndIsDerivedMember(Decl, false), Path() {}

  /// The member or (direct or indirect) field referred to by this member
  /// pointer, or 0 if this is a null member pointer.
  const ValueDecl *getDecl() const {
    return DeclAndIsDerivedMember.getPointer();
  }
  /// Is this actually a member of some type derived from the relevant class?
  bool isDerivedMember() const {
    return DeclAndIsDerivedMember.getInt();
  }
  /// Get the class which the declaration actually lives in.
  const CXXRecordDecl *getContainingRecord() const {
    return cast<CXXRecordDecl>(
        DeclAndIsDerivedMember.getPointer()->getDeclContext());
  }

  void moveInto(APValue &V) const {
    V = APValue(getDecl(), isDerivedMember(), Path);
  }
  void setFrom(const APValue &V) {
    assert(V.isMemberPointer())((V.isMemberPointer()) ? static_cast<void> (0) : __assert_fail
 ("V.isMemberPointer()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1583, __PRETTY_FUNCTION__));
    DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl());
    DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember());
    Path.clear();
    ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath();
    Path.insert(Path.end(), P.begin(), P.end());
  }

  /// DeclAndIsDerivedMember - The member declaration, and a flag indicating
  /// whether the member is a member of some class derived from the class type
  /// of the member pointer.
  llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember;
  /// Path - The path of base/derived classes from the member declaration's
  /// class (exclusive) to the class type of the member pointer (inclusive).
  SmallVector<const CXXRecordDecl*, 4> Path;

  /// Perform a cast towards the class of the Decl (either up or down the
  /// hierarchy).
  bool castBack(const CXXRecordDecl *Class) {
    assert(!Path.empty())((!Path.empty()) ? static_cast<void> (0) : __assert_fail
 ("!Path.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1602, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Expected;
    if (Path.size() >= 2)
      Expected = Path[Path.size() - 2];
    else
      Expected = getContainingRecord();
    if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) {
      // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*),
      // if B does not contain the original member and is not a base or
      // derived class of the class containing the original member, the result
      // of the cast is undefined.
      // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to
      // (D::*). We consider that to be a language defect.
      return false;
    }
    Path.pop_back();
    return true;
  }
  /// Perform a base-to-derived member pointer cast.
  bool castToDerived(const CXXRecordDecl *Derived) {
    if (!getDecl())
      return true;
    if (!isDerivedMember()) {
      Path.push_back(Derived);
      return true;
    }
    if (!castBack(Derived))
      return false;
    if (Path.empty())
      DeclAndIsDerivedMember.setInt(false);
    return true;
  }
  /// Perform a derived-to-base member pointer cast.
  bool castToBase(const CXXRecordDecl *Base) {
    if (!getDecl())
      return true;
    if (Path.empty())
      DeclAndIsDerivedMember.setInt(true);
    if (isDerivedMember()) {
      Path.push_back(Base);
      return true;
    }
    return castBack(Base);
  }
};

/// Compare two member pointers, which are assumed to be of the same type.
static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) {
  if (!LHS.getDecl() || !RHS.getDecl())
    return !LHS.getDecl() && !RHS.getDecl();
  if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl())
    return false;
  return LHS.Path == RHS.Path;
}
1656}

1658static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E);
1659static bool EvaluateInPlace(APValue &Result, EvalInfo &Info,
                          const LValue &This, const Expr *E,
                          bool AllowNonLiteralTypes = false);
1662static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info,
                         bool InvalidBaseOK = false);
1664static bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info,
                          bool InvalidBaseOK = false);
1666static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result,
                                EvalInfo &Info);
1668static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info);
1669static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info);
1670static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result,
                                  EvalInfo &Info);
1672static bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info);
1673static bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info);
1674static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result,
                         EvalInfo &Info);
1676static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result);

1678/// Evaluate an integer or fixed point expression into an APResult.
1679static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result,
                                      EvalInfo &Info);

1682/// Evaluate only a fixed point expression into an APResult.
1683static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result,
                             EvalInfo &Info);

1686//===----------------------------------------------------------------------===//
1687// Misc utilities
1688//===----------------------------------------------------------------------===//

1690/// Negate an APSInt in place, converting it to a signed form if necessary, and
1691/// preserving its value (by extending by up to one bit as needed).
1692static void negateAsSigned(APSInt &Int) {
if (Int.isUnsigned() || Int.isMinSignedValue()) {
  Int = Int.extend(Int.getBitWidth() + 1);
  Int.setIsSigned(true);
}
Int = -Int;
1698}

1700template<typename KeyT>
1701APValue &CallStackFrame::createTemporary(const KeyT *Key, QualType T,
                                       bool IsLifetimeExtended, LValue &LV) {
unsigned Version = getTempVersion();
APValue::LValueBase Base(Key, Index, Version);
LV.set(Base);
APValue &Result = Temporaries[MapKeyTy(Key, Version)];
assert(Result.isAbsent() && "temporary created multiple times")((Result.isAbsent() && "temporary created multiple times"
) ? static_cast<void> (0) : __assert_fail ("Result.isAbsent() && \"temporary created multiple times\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1707, __PRETTY_FUNCTION__));

// If we're creating a temporary immediately in the operand of a speculative
// evaluation, don't register a cleanup to be run outside the speculative
// evaluation context, since we won't actually be able to initialize this
// object.
if (Index <= Info.SpeculativeEvaluationDepth) {
  if (T.isDestructedType())
    Info.noteSideEffect();
} else {
  Info.CleanupStack.push_back(Cleanup(&Result, Base, T, IsLifetimeExtended));
}
return Result;
1720}

1722APValue *EvalInfo::createHeapAlloc(const Expr *E, QualType T, LValue &LV) {
if (NumHeapAllocs > DynamicAllocLValue::getMaxIndex()) {
  FFDiag(E, diag::note_constexpr_heap_alloc_limit_exceeded);
  return nullptr;
}

DynamicAllocLValue DA(NumHeapAllocs++);
LV.set(APValue::LValueBase::getDynamicAlloc(DA, T));
auto Result = HeapAllocs.emplace(std::piecewise_construct,
                                 std::forward_as_tuple(DA), std::tuple<>());
assert(Result.second && "reused a heap alloc index?")((Result.second && "reused a heap alloc index?") ? static_cast
<void> (0) : __assert_fail ("Result.second && \"reused a heap alloc index?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1732, __PRETTY_FUNCTION__));
Result.first->second.AllocExpr = E;
return &Result.first->second.Value;
1735}

1737/// Produce a string describing the given constexpr call.
1738void CallStackFrame::describe(raw_ostream &Out) {
unsigned ArgIndex = 0;
bool IsMemberCall = isa<CXXMethodDecl>(Callee) &&
                    !isa<CXXConstructorDecl>(Callee) &&
                    cast<CXXMethodDecl>(Callee)->isInstance();

if (!IsMemberCall)
  Out << *Callee << '(';

if (This && IsMemberCall) {
  APValue Val;
  This->moveInto(Val);
  Val.printPretty(Out, Info.Ctx,
                  This->Designator.MostDerivedType);
  // FIXME: Add parens around Val if needed.
  Out << "->" << *Callee << '(';
  IsMemberCall = false;
}

for (FunctionDecl::param_const_iterator I = Callee->param_begin(),
     E = Callee->param_end(); I != E; ++I, ++ArgIndex) {
  if (ArgIndex > (unsigned)IsMemberCall)
    Out << ", ";

  const ParmVarDecl *Param = *I;
  const APValue &Arg = Arguments[ArgIndex];
  Arg.printPretty(Out, Info.Ctx, Param->getType());

  if (ArgIndex == 0 && IsMemberCall)
    Out << "->" << *Callee << '(';
}

Out << ')';
1771}

1773/// Evaluate an expression to see if it had side-effects, and discard its
1774/// result.
1775/// \return \c true if the caller should keep evaluating.
1776static bool EvaluateIgnoredValue(EvalInfo &Info, const Expr *E) {
APValue Scratch;
if (!Evaluate(Scratch, Info, E))
  // We don't need the value, but we might have skipped a side effect here.
  return Info.noteSideEffect();
return true;
1782}

1784/// Should this call expression be treated as a string literal?
1785static bool IsStringLiteralCall(const CallExpr *E) {
unsigned Builtin = E->getBuiltinCallee();
return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString ||
        Builtin == Builtin::BI__builtin___NSStringMakeConstantString);
1789}

1791static bool IsGlobalLValue(APValue::LValueBase B) {
// C++11 [expr.const]p3 An address constant expression is a prvalue core
// constant expression of pointer type that evaluates to...

// ... a null pointer value, or a prvalue core constant expression of type
// std::nullptr_t.
if (!B) return true;

if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) {
  // ... the address of an object with static storage duration,
  if (const VarDecl *VD = dyn_cast<VarDecl>(D))
    return VD->hasGlobalStorage();
  // ... the address of a function,
  return isa<FunctionDecl>(D);
}

if (B.is<TypeInfoLValue>() || B.is<DynamicAllocLValue>())
  return true;

const Expr *E = B.get<const Expr*>();
switch (E->getStmtClass()) {
default:
  return false;
case Expr::CompoundLiteralExprClass: {
  const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E);
  return CLE->isFileScope() && CLE->isLValue();
}
case Expr::MaterializeTemporaryExprClass:
  // A materialized temporary might have been lifetime-extended to static
  // storage duration.
  return cast<MaterializeTemporaryExpr>(E)->getStorageDuration() == SD_Static;
// A string literal has static storage duration.
case Expr::StringLiteralClass:
case Expr::PredefinedExprClass:
case Expr::ObjCStringLiteralClass:
case Expr::ObjCEncodeExprClass:
case Expr::CXXUuidofExprClass:
  return true;
case Expr::ObjCBoxedExprClass:
  return cast<ObjCBoxedExpr>(E)->isExpressibleAsConstantInitializer();
case Expr::CallExprClass:
  return IsStringLiteralCall(cast<CallExpr>(E));
// For GCC compatibility, &&label has static storage duration.
case Expr::AddrLabelExprClass:
  return true;
// A Block literal expression may be used as the initialization value for
// Block variables at global or local static scope.
case Expr::BlockExprClass:
  return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures();
case Expr::ImplicitValueInitExprClass:
  // FIXME:
  // We can never form an lvalue with an implicit value initialization as its
  // base through expression evaluation, so these only appear in one case: the
  // implicit variable declaration we invent when checking whether a constexpr
  // constructor can produce a constant expression. We must assume that such
  // an expression might be a global lvalue.
  return true;
}
1849}

1851static const ValueDecl *GetLValueBaseDecl(const LValue &LVal) {
return LVal.Base.dyn_cast<const ValueDecl*>();
1853}

1855static bool IsLiteralLValue(const LValue &Value) {
if (Value.getLValueCallIndex())
  return false;
const Expr *E = Value.Base.dyn_cast<const Expr*>();
return E && !isa<MaterializeTemporaryExpr>(E);
1860}

1862static bool IsWeakLValue(const LValue &Value) {
const ValueDecl *Decl = GetLValueBaseDecl(Value);
return Decl && Decl->isWeak();
1865}

1867static bool isZeroSized(const LValue &Value) {
const ValueDecl *Decl = GetLValueBaseDecl(Value);
if (Decl && isa<VarDecl>(Decl)) {
  QualType Ty = Decl->getType();
  if (Ty->isArrayType())
    return Ty->isIncompleteType() ||
           Decl->getASTContext().getTypeSize(Ty) == 0;
}
return false;
1876}

1878static bool HasSameBase(const LValue &A, const LValue &B) {
if (!A.getLValueBase())
37
←
Assuming the condition is true→
38
←
Taking true branch→
  return !B.getLValueBase();
39
←
Assuming the condition is true→
40
←
Returning the value 1, which participates in a condition later→
if (!B.getLValueBase())
  return false;

if (A.getLValueBase().getOpaqueValue() !=
    B.getLValueBase().getOpaqueValue()) {
  const Decl *ADecl = GetLValueBaseDecl(A);
  if (!ADecl)
    return false;
  const Decl *BDecl = GetLValueBaseDecl(B);
  if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl())
    return false;
}

return IsGlobalLValue(A.getLValueBase()) ||
       (A.getLValueCallIndex() == B.getLValueCallIndex() &&
        A.getLValueVersion() == B.getLValueVersion());
1897}

1899static void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) {
assert(Base && "no location for a null lvalue")((Base && "no location for a null lvalue") ? static_cast
<void> (0) : __assert_fail ("Base && \"no location for a null lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1900, __PRETTY_FUNCTION__));
const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>();
if (VD)
  Info.Note(VD->getLocation(), diag::note_declared_at);
else if (const Expr *E = Base.dyn_cast<const Expr*>())
  Info.Note(E->getExprLoc(), diag::note_constexpr_temporary_here);
else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) {
  // FIXME: Produce a note for dangling pointers too.
  if (Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA))
    Info.Note((*Alloc)->AllocExpr->getExprLoc(),
              diag::note_constexpr_dynamic_alloc_here);
}
// We have no information to show for a typeid(T) object.
1913}

1915enum class CheckEvaluationResultKind {
ConstantExpression,
FullyInitialized,
1918};

1920/// Materialized temporaries that we've already checked to determine if they're
1921/// initializsed by a constant expression.
1922using CheckedTemporaries =
  llvm::SmallPtrSet<const MaterializeTemporaryExpr *, 8>;

1925static bool CheckEvaluationResult(CheckEvaluationResultKind CERK,
                                EvalInfo &Info, SourceLocation DiagLoc,
                                QualType Type, const APValue &Value,
                                Expr::ConstExprUsage Usage,
                                SourceLocation SubobjectLoc,
                                CheckedTemporaries &CheckedTemps);

1932/// Check that this reference or pointer core constant expression is a valid
1933/// value for an address or reference constant expression. Return true if we
1934/// can fold this expression, whether or not it's a constant expression.
1935static bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc,
                                        QualType Type, const LValue &LVal,
                                        Expr::ConstExprUsage Usage,
                                        CheckedTemporaries &CheckedTemps) {
bool IsReferenceType = Type->isReferenceType();

APValue::LValueBase Base = LVal.getLValueBase();
const SubobjectDesignator &Designator = LVal.getLValueDesignator();

// Check that the object is a global. Note that the fake 'this' object we
// manufacture when checking potential constant expressions is conservatively
// assumed to be global here.
if (!IsGlobalLValue(Base)) {
  if (Info.getLangOpts().CPlusPlus11) {
    const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>();
    Info.FFDiag(Loc, diag::note_constexpr_non_global, 1)
      << IsReferenceType << !Designator.Entries.empty()
      << !!VD << VD;
    NoteLValueLocation(Info, Base);
  } else {
    Info.FFDiag(Loc);
  }
  // Don't allow references to temporaries to escape.
  return false;
}
assert((Info.checkingPotentialConstantExpression() ||(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex
() == 0) && "have call index for global lvalue") ? static_cast
<void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1962, __PRETTY_FUNCTION__))
        LVal.getLValueCallIndex() == 0) &&(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex
() == 0) && "have call index for global lvalue") ? static_cast
<void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1962, __PRETTY_FUNCTION__))
       "have call index for global lvalue")(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex
() == 0) && "have call index for global lvalue") ? static_cast
<void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 1962, __PRETTY_FUNCTION__));

if (Base.is<DynamicAllocLValue>()) {
  Info.FFDiag(Loc, diag::note_constexpr_dynamic_alloc)
      << IsReferenceType << !Designator.Entries.empty();
  NoteLValueLocation(Info, Base);
  return false;
}

if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) {
  if (const VarDecl *Var = dyn_cast<const VarDecl>(VD)) {
    // Check if this is a thread-local variable.
    if (Var->getTLSKind())
      // FIXME: Diagnostic!
      return false;

    // A dllimport variable never acts like a constant.
    if (Usage == Expr::EvaluateForCodeGen && Var->hasAttr<DLLImportAttr>())
      // FIXME: Diagnostic!
      return false;
  }
  if (const auto *FD = dyn_cast<const FunctionDecl>(VD)) {
    // __declspec(dllimport) must be handled very carefully:
    // We must never initialize an expression with the thunk in C++.
    // Doing otherwise would allow the same id-expression to yield
    // different addresses for the same function in different translation
    // units.  However, this means that we must dynamically initialize the
    // expression with the contents of the import address table at runtime.
    //
    // The C language has no notion of ODR; furthermore, it has no notion of
    // dynamic initialization.  This means that we are permitted to
    // perform initialization with the address of the thunk.
    if (Info.getLangOpts().CPlusPlus && Usage == Expr::EvaluateForCodeGen &&
        FD->hasAttr<DLLImportAttr>())
      // FIXME: Diagnostic!
      return false;
  }
} else if (const auto *MTE = dyn_cast_or_null<MaterializeTemporaryExpr>(
               Base.dyn_cast<const Expr *>())) {
  if (CheckedTemps.insert(MTE).second) {
    QualType TempType = getType(Base);
    if (TempType.isDestructedType()) {
      Info.FFDiag(MTE->getExprLoc(),
                  diag::note_constexpr_unsupported_tempoarary_nontrivial_dtor)
          << TempType;
      return false;
    }

    APValue *V = Info.Ctx.getMaterializedTemporaryValue(MTE, false);
    assert(V && "evasluation result refers to uninitialised temporary")((V && "evasluation result refers to uninitialised temporary"
) ? static_cast<void> (0) : __assert_fail ("V && \"evasluation result refers to uninitialised temporary\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2011, __PRETTY_FUNCTION__));
    if (!CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression,
                               Info, MTE->getExprLoc(), TempType, *V,
                               Usage, SourceLocation(), CheckedTemps))
      return false;
  }
}

// Allow address constant expressions to be past-the-end pointers. This is
// an extension: the standard requires them to point to an object.
if (!IsReferenceType)
  return true;

// A reference constant expression must refer to an object.
if (!Base) {
  // FIXME: diagnostic
  Info.CCEDiag(Loc);
  return true;
}

// Does this refer one past the end of some object?
if (!Designator.Invalid && Designator.isOnePastTheEnd()) {
  const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>();
  Info.FFDiag(Loc, diag::note_constexpr_past_end, 1)
    << !Designator.Entries.empty() << !!VD << VD;
  NoteLValueLocation(Info, Base);
}

return true;
2040}

2042/// Member pointers are constant expressions unless they point to a
2043/// non-virtual dllimport member function.
2044static bool CheckMemberPointerConstantExpression(EvalInfo &Info,
                                               SourceLocation Loc,
                                               QualType Type,
                                               const APValue &Value,
                                               Expr::ConstExprUsage Usage) {
const ValueDecl *Member = Value.getMemberPointerDecl();
const auto *FD = dyn_cast_or_null<CXXMethodDecl>(Member);
if (!FD)
  return true;
return Usage == Expr::EvaluateForMangling || FD->isVirtual() ||
       !FD->hasAttr<DLLImportAttr>();
2055}

2057/// Check that this core constant expression is of literal type, and if not,
2058/// produce an appropriate diagnostic.
2059static bool CheckLiteralType(EvalInfo &Info, const Expr *E,
                           const LValue *This = nullptr) {
if (!E->isRValue() || E->getType()->isLiteralType(Info.Ctx))
  return true;

// C++1y: A constant initializer for an object o [...] may also invoke
// constexpr constructors for o and its subobjects even if those objects
// are of non-literal class types.
//
// C++11 missed this detail for aggregates, so classes like this:
//   struct foo_t { union { int i; volatile int j; } u; };
// are not (obviously) initializable like so:
//   __attribute__((__require_constant_initialization__))
//   static const foo_t x = {{0}};
// because "i" is a subobject with non-literal initialization (due to the
// volatile member of the union). See:
//   http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1677
// Therefore, we use the C++1y behavior.
if (This && Info.EvaluatingDecl == This->getLValueBase())
  return true;

// Prvalue constant expressions must be of literal types.
if (Info.getLangOpts().CPlusPlus11)
  Info.FFDiag(E, diag::note_constexpr_nonliteral)
    << E->getType();
else
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
return false;
2087}

2089static bool CheckEvaluationResult(CheckEvaluationResultKind CERK,
                                EvalInfo &Info, SourceLocation DiagLoc,
                                QualType Type, const APValue &Value,
                                Expr::ConstExprUsage Usage,
                                SourceLocation SubobjectLoc,
                                CheckedTemporaries &CheckedTemps) {
if (!Value.hasValue()) {
  Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized)
    << true << Type;
  if (SubobjectLoc.isValid())
    Info.Note(SubobjectLoc, diag::note_constexpr_subobject_declared_here);
  return false;
}

// We allow _Atomic(T) to be initialized from anything that T can be
// initialized from.
if (const AtomicType *AT = Type->getAs<AtomicType>())
  Type = AT->getValueType();

// Core issue 1454: For a literal constant expression of array or class type,
// each subobject of its value shall have been initialized by a constant
// expression.
if (Value.isArray()) {
  QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType();
  for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) {
    if (!CheckEvaluationResult(CERK, Info, DiagLoc, EltTy,
                               Value.getArrayInitializedElt(I), Usage,
                               SubobjectLoc, CheckedTemps))
      return false;
  }
  if (!Value.hasArrayFiller())
    return true;
  return CheckEvaluationResult(CERK, Info, DiagLoc, EltTy,
                               Value.getArrayFiller(), Usage, SubobjectLoc,
                               CheckedTemps);
}
if (Value.isUnion() && Value.getUnionField()) {
  return CheckEvaluationResult(
      CERK, Info, DiagLoc, Value.getUnionField()->getType(),
      Value.getUnionValue(), Usage, Value.getUnionField()->getLocation(),
      CheckedTemps);
}
if (Value.isStruct()) {
  RecordDecl *RD = Type->castAs<RecordType>()->getDecl();
  if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) {
    unsigned BaseIndex = 0;
    for (const CXXBaseSpecifier &BS : CD->bases()) {
      if (!CheckEvaluationResult(CERK, Info, DiagLoc, BS.getType(),
                                 Value.getStructBase(BaseIndex), Usage,
                                 BS.getBeginLoc(), CheckedTemps))
        return false;
      ++BaseIndex;
    }
  }
  for (const auto *I : RD->fields()) {
    if (I->isUnnamedBitfield())
      continue;

    if (!CheckEvaluationResult(CERK, Info, DiagLoc, I->getType(),
                               Value.getStructField(I->getFieldIndex()),
                               Usage, I->getLocation(), CheckedTemps))
      return false;
  }
}

if (Value.isLValue() &&
    CERK == CheckEvaluationResultKind::ConstantExpression) {
  LValue LVal;
  LVal.setFrom(Info.Ctx, Value);
  return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal, Usage,
                                       CheckedTemps);
}

if (Value.isMemberPointer() &&
    CERK == CheckEvaluationResultKind::ConstantExpression)
  return CheckMemberPointerConstantExpression(Info, DiagLoc, Type, Value, Usage);

// Everything else is fine.
return true;
2168}

2170/// Check that this core constant expression value is a valid value for a
2171/// constant expression. If not, report an appropriate diagnostic. Does not
2172/// check that the expression is of literal type.
2173static bool
2174CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, QualType Type,
                      const APValue &Value,
                      Expr::ConstExprUsage Usage = Expr::EvaluateForCodeGen) {
CheckedTemporaries CheckedTemps;
return CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression,
                             Info, DiagLoc, Type, Value, Usage,
                             SourceLocation(), CheckedTemps);
2181}

2183/// Check that this evaluated value is fully-initialized and can be loaded by
2184/// an lvalue-to-rvalue conversion.
2185static bool CheckFullyInitialized(EvalInfo &Info, SourceLocation DiagLoc,
                                QualType Type, const APValue &Value) {
CheckedTemporaries CheckedTemps;
return CheckEvaluationResult(
    CheckEvaluationResultKind::FullyInitialized, Info, DiagLoc, Type, Value,
    Expr::EvaluateForCodeGen, SourceLocation(), CheckedTemps);
2191}

2193/// Enforce C++2a [expr.const]/4.17, which disallows new-expressions unless
2194/// "the allocated storage is deallocated within the evaluation".
2195static bool CheckMemoryLeaks(EvalInfo &Info) {
if (!Info.HeapAllocs.empty()) {
  // We can still fold to a constant despite a compile-time memory leak,
  // so long as the heap allocation isn't referenced in the result (we check
  // that in CheckConstantExpression).
  Info.CCEDiag(Info.HeapAllocs.begin()->second.AllocExpr,
               diag::note_constexpr_memory_leak)
      << unsigned(Info.HeapAllocs.size() - 1);
}
return true;
2205}

2207static bool EvalPointerValueAsBool(const APValue &Value, bool &Result) {
// A null base expression indicates a null pointer.  These are always
// evaluatable, and they are false unless the offset is zero.
if (!Value.getLValueBase()) {
  Result = !Value.getLValueOffset().isZero();
  return true;
}

// We have a non-null base.  These are generally known to be true, but if it's
// a weak declaration it can be null at runtime.
Result = true;
const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>();
return !Decl || !Decl->isWeak();
2220}

2222static bool HandleConversionToBool(const APValue &Val, bool &Result) {
switch (Val.getKind()) {
case APValue::None:
case APValue::Indeterminate:
  return false;
case APValue::Int:
  Result = Val.getInt().getBoolValue();
  return true;
case APValue::FixedPoint:
  Result = Val.getFixedPoint().getBoolValue();
  return true;
case APValue::Float:
  Result = !Val.getFloat().isZero();
  return true;
case APValue::ComplexInt:
  Result = Val.getComplexIntReal().getBoolValue() ||
           Val.getComplexIntImag().getBoolValue();
  return true;
case APValue::ComplexFloat:
  Result = !Val.getComplexFloatReal().isZero() ||
           !Val.getComplexFloatImag().isZero();
  return true;
case APValue::LValue:
  return EvalPointerValueAsBool(Val, Result);
case APValue::MemberPointer:
  Result = Val.getMemberPointerDecl();
  return true;
case APValue::Vector:
case APValue::Array:
case APValue::Struct:
case APValue::Union:
case APValue::AddrLabelDiff:
  return false;
}

llvm_unreachable("unknown APValue kind")::llvm::llvm_unreachable_internal("unknown APValue kind", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2257);
2258}

2260static bool EvaluateAsBooleanCondition(const Expr *E, bool &Result,
                                     EvalInfo &Info) {
assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition")((E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"
) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && \"missing lvalue-to-rvalue conv in bool condition\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2262, __PRETTY_FUNCTION__));
APValue Val;
if (!Evaluate(Val, Info, E))
  return false;
return HandleConversionToBool(Val, Result);
2267}

2269template<typename T>
2270static bool HandleOverflow(EvalInfo &Info, const Expr *E,
                         const T &SrcValue, QualType DestType) {
Info.CCEDiag(E, diag::note_constexpr_overflow)
  << SrcValue << DestType;
return Info.noteUndefinedBehavior();
2275}

2277static bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E,
                               QualType SrcType, const APFloat &Value,
                               QualType DestType, APSInt &Result) {
unsigned DestWidth = Info.Ctx.getIntWidth(DestType);
// Determine whether we are converting to unsigned or signed.
bool DestSigned = DestType->isSignedIntegerOrEnumerationType();

Result = APSInt(DestWidth, !DestSigned);
bool ignored;
if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored)
    & APFloat::opInvalidOp)
  return HandleOverflow(Info, E, Value, DestType);
return true;
2290}

2292static bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E,
                                 QualType SrcType, QualType DestType,
                                 APFloat &Result) {
APFloat Value = Result;
bool ignored;
Result.convert(Info.Ctx.getFloatTypeSemantics(DestType),
               APFloat::rmNearestTiesToEven, &ignored);
return true;
2300}

2302static APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E,
                               QualType DestType, QualType SrcType,
                               const APSInt &Value) {
unsigned DestWidth = Info.Ctx.getIntWidth(DestType);
// Figure out if this is a truncate, extend or noop cast.
// If the input is signed, do a sign extend, noop, or truncate.
APSInt Result = Value.extOrTrunc(DestWidth);
Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType());
if (DestType->isBooleanType())
  Result = Value.getBoolValue();
return Result;
2313}

2315static bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E,
                               QualType SrcType, const APSInt &Value,
                               QualType DestType, APFloat &Result) {
Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1);
Result.convertFromAPInt(Value, Value.isSigned(),
                        APFloat::rmNearestTiesToEven);
return true;
2322}

2324static bool truncateBitfieldValue(EvalInfo &Info, const Expr *E,
                                APValue &Value, const FieldDecl *FD) {
assert(FD->isBitField() && "truncateBitfieldValue on non-bitfield")((FD->isBitField() && "truncateBitfieldValue on non-bitfield"
) ? static_cast<void> (0) : __assert_fail ("FD->isBitField() && \"truncateBitfieldValue on non-bitfield\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2326, __PRETTY_FUNCTION__));

if (!Value.isInt()) {
  // Trying to store a pointer-cast-to-integer into a bitfield.
  // FIXME: In this case, we should provide the diagnostic for casting
  // a pointer to an integer.
  assert(Value.isLValue() && "integral value neither int nor lvalue?")((Value.isLValue() && "integral value neither int nor lvalue?"
) ? static_cast<void> (0) : __assert_fail ("Value.isLValue() && \"integral value neither int nor lvalue?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2332, __PRETTY_FUNCTION__));
  Info.FFDiag(E);
  return false;
}

APSInt &Int = Value.getInt();
unsigned OldBitWidth = Int.getBitWidth();
unsigned NewBitWidth = FD->getBitWidthValue(Info.Ctx);
if (NewBitWidth < OldBitWidth)
  Int = Int.trunc(NewBitWidth).extend(OldBitWidth);
return true;
2343}

2345static bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E,
                                llvm::APInt &Res) {
APValue SVal;
if (!Evaluate(SVal, Info, E))
  return false;
if (SVal.isInt()) {
  Res = SVal.getInt();
  return true;
}
if (SVal.isFloat()) {
  Res = SVal.getFloat().bitcastToAPInt();
  return true;
}
if (SVal.isVector()) {
  QualType VecTy = E->getType();
  unsigned VecSize = Info.Ctx.getTypeSize(VecTy);
  QualType EltTy = VecTy->castAs<VectorType>()->getElementType();
  unsigned EltSize = Info.Ctx.getTypeSize(EltTy);
  bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian();
  Res = llvm::APInt::getNullValue(VecSize);
  for (unsigned i = 0; i < SVal.getVectorLength(); i++) {
    APValue &Elt = SVal.getVectorElt(i);
    llvm::APInt EltAsInt;
    if (Elt.isInt()) {
      EltAsInt = Elt.getInt();
    } else if (Elt.isFloat()) {
      EltAsInt = Elt.getFloat().bitcastToAPInt();
    } else {
      // Don't try to handle vectors of anything other than int or float
      // (not sure if it's possible to hit this case).
      Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
      return false;
    }
    unsigned BaseEltSize = EltAsInt.getBitWidth();
    if (BigEndian)
      Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize);
    else
      Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize);
  }
  return true;
}
// Give up if the input isn't an int, float, or vector.  For example, we
// reject "(v4i16)(intptr_t)&a".
Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
return false;
2390}

2392/// Perform the given integer operation, which is known to need at most BitWidth
2393/// bits, and check for overflow in the original type (if that type was not an
2394/// unsigned type).
2395template<typename Operation>
2396static bool CheckedIntArithmetic(EvalInfo &Info, const Expr *E,
                               const APSInt &LHS, const APSInt &RHS,
                               unsigned BitWidth, Operation Op,
                               APSInt &Result) {
if (LHS.isUnsigned()) {
  Result = Op(LHS, RHS);
  return true;
}

APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false);
Result = Value.trunc(LHS.getBitWidth());
if (Result.extend(BitWidth) != Value) {
  if (Info.checkingForUndefinedBehavior())
    Info.Ctx.getDiagnostics().Report(E->getExprLoc(),
                                     diag::warn_integer_constant_overflow)
        << Result.toString(10) << E->getType();
  else
    return HandleOverflow(Info, E, Value, E->getType());
}
return true;
2416}

2418/// Perform the given binary integer operation.
2419static bool handleIntIntBinOp(EvalInfo &Info, const Expr *E, const APSInt &LHS,
                            BinaryOperatorKind Opcode, APSInt RHS,
                            APSInt &Result) {
switch (Opcode) {
default:
  Info.FFDiag(E);
  return false;
case BO_Mul:
  return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() * 2,
                              std::multiplies<APSInt>(), Result);
case BO_Add:
  return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1,
                              std::plus<APSInt>(), Result);
case BO_Sub:
  return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1,
                              std::minus<APSInt>(), Result);
case BO_And: Result = LHS & RHS; return true;
case BO_Xor: Result = LHS ^ RHS; return true;
case BO_Or:  Result = LHS | RHS; return true;
case BO_Div:
case BO_Rem:
  if (RHS == 0) {
    Info.FFDiag(E, diag::note_expr_divide_by_zero);
    return false;
  }
  Result = (Opcode == BO_Rem ? LHS % RHS : LHS / RHS);
  // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. APSInt supports
  // this operation and gives the two's complement result.
  if (RHS.isNegative() && RHS.isAllOnesValue() &&
      LHS.isSigned() && LHS.isMinSignedValue())
    return HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1),
                          E->getType());
  return true;
case BO_Shl: {
  if (Info.getLangOpts().OpenCL)
    // OpenCL 6.3j: shift values are effectively % word size of LHS.
    RHS &= APSInt(llvm::APInt(RHS.getBitWidth(),
                  static_cast<uint64_t>(LHS.getBitWidth() - 1)),
                  RHS.isUnsigned());
  else if (RHS.isSigned() && RHS.isNegative()) {
    // During constant-folding, a negative shift is an opposite shift. Such
    // a shift is not a constant expression.
    Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS;
    RHS = -RHS;
    goto shift_right;
  }
shift_left:
  // C++11 [expr.shift]p1: Shift width must be less than the bit width of
  // the shifted type.
  unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1);
  if (SA != RHS) {
    Info.CCEDiag(E, diag::note_constexpr_large_shift)
      << RHS << E->getType() << LHS.getBitWidth();
  } else if (LHS.isSigned() && !Info.getLangOpts().CPlusPlus2a) {
    // C++11 [expr.shift]p2: A signed left shift must have a non-negative
    // operand, and must not overflow the corresponding unsigned type.
    // C++2a [expr.shift]p2: E1 << E2 is the unique value congruent to
    // E1 x 2^E2 module 2^N.
    if (LHS.isNegative())
      Info.CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS;
    else if (LHS.countLeadingZeros() < SA)
      Info.CCEDiag(E, diag::note_constexpr_lshift_discards);
  }
  Result = LHS << SA;
  return true;
}
case BO_Shr: {
  if (Info.getLangOpts().OpenCL)
    // OpenCL 6.3j: shift values are effectively % word size of LHS.
    RHS &= APSInt(llvm::APInt(RHS.getBitWidth(),
                  static_cast<uint64_t>(LHS.getBitWidth() - 1)),
                  RHS.isUnsigned());
  else if (RHS.isSigned() && RHS.isNegative()) {
    // During constant-folding, a negative shift is an opposite shift. Such a
    // shift is not a constant expression.
    Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS;
    RHS = -RHS;
    goto shift_left;
  }
shift_right:
  // C++11 [expr.shift]p1: Shift width must be less than the bit width of the
  // shifted type.
  unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1);
  if (SA != RHS)
    Info.CCEDiag(E, diag::note_constexpr_large_shift)
      << RHS << E->getType() << LHS.getBitWidth();
  Result = LHS >> SA;
  return true;
}

case BO_LT: Result = LHS < RHS; return true;
case BO_GT: Result = LHS > RHS; return true;
case BO_LE: Result = LHS <= RHS; return true;
case BO_GE: Result = LHS >= RHS; return true;
case BO_EQ: Result = LHS == RHS; return true;
case BO_NE: Result = LHS != RHS; return true;
case BO_Cmp:
  llvm_unreachable("BO_Cmp should be handled elsewhere")::llvm::llvm_unreachable_internal("BO_Cmp should be handled elsewhere"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2516);
}
2518}

2520/// Perform the given binary floating-point operation, in-place, on LHS.
2521static bool handleFloatFloatBinOp(EvalInfo &Info, const Expr *E,
                                APFloat &LHS, BinaryOperatorKind Opcode,
                                const APFloat &RHS) {
switch (Opcode) {
default:
  Info.FFDiag(E);
  return false;
case BO_Mul:
  LHS.multiply(RHS, APFloat::rmNearestTiesToEven);
  break;
case BO_Add:
  LHS.add(RHS, APFloat::rmNearestTiesToEven);
  break;
case BO_Sub:
  LHS.subtract(RHS, APFloat::rmNearestTiesToEven);
  break;
case BO_Div:
  // [expr.mul]p4:
  //   If the second operand of / or % is zero the behavior is undefined.
  if (RHS.isZero())
    Info.CCEDiag(E, diag::note_expr_divide_by_zero);
  LHS.divide(RHS, APFloat::rmNearestTiesToEven);
  break;
}

// [expr.pre]p4:
//   If during the evaluation of an expression, the result is not
//   mathematically defined [...], the behavior is undefined.
// FIXME: C++ rules require us to not conform to IEEE 754 here.
if (LHS.isNaN()) {
  Info.CCEDiag(E, diag::note_constexpr_float_arithmetic) << LHS.isNaN();
  return Info.noteUndefinedBehavior();
}
return true;
2555}

2557/// Cast an lvalue referring to a base subobject to a derived class, by
2558/// truncating the lvalue's path to the given length.
2559static bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result,
                             const RecordDecl *TruncatedType,
                             unsigned TruncatedElements) {
SubobjectDesignator &D = Result.Designator;

// Check we actually point to a derived class object.
if (TruncatedElements == D.Entries.size())
  return true;
assert(TruncatedElements >= D.MostDerivedPathLength &&((TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class"
) ? static_cast<void> (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2568, __PRETTY_FUNCTION__))
       "not casting to a derived class")((TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class"
) ? static_cast<void> (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2568, __PRETTY_FUNCTION__));
if (!Result.checkSubobject(Info, E, CSK_Derived))
  return false;

// Truncate the path to the subobject, and remove any derived-to-base offsets.
const RecordDecl *RD = TruncatedType;
for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) {
  if (RD->isInvalidDecl()) return false;
  const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);
  const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]);
  if (isVirtualBaseClass(D.Entries[I]))
    Result.Offset -= Layout.getVBaseClassOffset(Base);
  else
    Result.Offset -= Layout.getBaseClassOffset(Base);
  RD = Base;
}
D.Entries.resize(TruncatedElements);
return true;
2586}

2588static bool HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj,
                                 const CXXRecordDecl *Derived,
                                 const CXXRecordDecl *Base,
                                 const ASTRecordLayout *RL = nullptr) {
if (!RL) {
  if (Derived->isInvalidDecl()) return false;
  RL = &Info.Ctx.getASTRecordLayout(Derived);
}

Obj.getLValueOffset() += RL->getBaseClassOffset(Base);
Obj.addDecl(Info, E, Base, /*Virtual*/ false);
return true;
2600}

2602static bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj,
                           const CXXRecordDecl *DerivedDecl,
                           const CXXBaseSpecifier *Base) {
const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();

if (!Base->isVirtual())
  return HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl);

SubobjectDesignator &D = Obj.Designator;
if (D.Invalid)
  return false;

// Extract most-derived object and corresponding type.
DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl();
if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength))
  return false;

// Find the virtual base class.
if (DerivedDecl->isInvalidDecl()) return false;
const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl);
Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl);
Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true);
return true;
2625}

2627static bool HandleLValueBasePath(EvalInfo &Info, const CastExpr *E,
                               QualType Type, LValue &Result) {
for (CastExpr::path_const_iterator PathI = E->path_begin(),
                                   PathE = E->path_end();
     PathI != PathE; ++PathI) {
  if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(),
                        *PathI))
    return false;
  Type = (*PathI)->getType();
}
return true;
2638}

2640/// Cast an lvalue referring to a derived class to a known base subobject.
2641static bool CastToBaseClass(EvalInfo &Info, const Expr *E, LValue &Result,
                          const CXXRecordDecl *DerivedRD,
                          const CXXRecordDecl *BaseRD) {
CXXBasePaths Paths(/*FindAmbiguities=*/false,
                   /*RecordPaths=*/true, /*DetectVirtual=*/false);
if (!DerivedRD->isDerivedFrom(BaseRD, Paths))
  llvm_unreachable("Class must be derived from the passed in base class!")::llvm::llvm_unreachable_internal("Class must be derived from the passed in base class!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2647);

for (CXXBasePathElement &Elem : Paths.front())
  if (!HandleLValueBase(Info, E, Result, Elem.Class, Elem.Base))
    return false;
return true;
2653}

2655/// Update LVal to refer to the given field, which must be a member of the type
2656/// currently described by LVal.
2657static bool HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal,
                             const FieldDecl *FD,
                             const ASTRecordLayout *RL = nullptr) {
if (!RL) {
  if (FD->getParent()->isInvalidDecl()) return false;
  RL = &Info.Ctx.getASTRecordLayout(FD->getParent());
}

unsigned I = FD->getFieldIndex();
LVal.adjustOffset(Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)));
LVal.addDecl(Info, E, FD);
return true;
2669}

2671/// Update LVal to refer to the given indirect field.
2672static bool HandleLValueIndirectMember(EvalInfo &Info, const Expr *E,
                                     LValue &LVal,
                                     const IndirectFieldDecl *IFD) {
for (const auto *C : IFD->chain())
  if (!HandleLValueMember(Info, E, LVal, cast<FieldDecl>(C)))
    return false;
return true;
2679}

2681/// Get the size of the given type in char units.
2682static bool HandleSizeof(EvalInfo &Info, SourceLocation Loc,
                       QualType Type, CharUnits &Size) {
// sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc
// extension.
if (Type->isVoidType() || Type->isFunctionType()) {
  Size = CharUnits::One();
  return true;
}

if (Type->isDependentType()) {
  Info.FFDiag(Loc);
  return false;
}

if (!Type->isConstantSizeType()) {
  // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2.
  // FIXME: Better diagnostic.
  Info.FFDiag(Loc);
  return false;
}

Size = Info.Ctx.getTypeSizeInChars(Type);
return true;
2705}

2707/// Update a pointer value to model pointer arithmetic.
2708/// \param Info - Information about the ongoing evaluation.
2709/// \param E - The expression being evaluated, for diagnostic purposes.
2710/// \param LVal - The pointer value to be updated.
2711/// \param EltTy - The pointee type represented by LVal.
2712/// \param Adjustment - The adjustment, in objects of type EltTy, to add.
2713static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E,
                                      LValue &LVal, QualType EltTy,
                                      APSInt Adjustment) {
CharUnits SizeOfPointee;
if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee))
  return false;

LVal.adjustOffsetAndIndex(Info, E, Adjustment, SizeOfPointee);
return true;
2722}

2724static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E,
                                      LValue &LVal, QualType EltTy,
                                      int64_t Adjustment) {
return HandleLValueArrayAdjustment(Info, E, LVal, EltTy,
                                   APSInt::get(Adjustment));
2729}

2731/// Update an lvalue to refer to a component of a complex number.
2732/// \param Info - Information about the ongoing evaluation.
2733/// \param LVal - The lvalue to be updated.
2734/// \param EltTy - The complex number's component type.
2735/// \param Imag - False for the real component, true for the imaginary.
2736static bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E,
                                     LValue &LVal, QualType EltTy,
                                     bool Imag) {
if (Imag) {
  CharUnits SizeOfComponent;
  if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent))
    return false;
  LVal.Offset += SizeOfComponent;
}
LVal.addComplex(Info, E, EltTy, Imag);
return true;
2747}

2749/// Try to evaluate the initializer for a variable declaration.
2750///
2751/// \param Info   Information about the ongoing evaluation.
2752/// \param E      An expression to be used when printing diagnostics.
2753/// \param VD     The variable whose initializer should be obtained.
2754/// \param Frame  The frame in which the variable was created. Must be null
2755///               if this variable is not local to the evaluation.
2756/// \param Result Filled in with a pointer to the value of the variable.
2757static bool evaluateVarDeclInit(EvalInfo &Info, const Expr *E,
                              const VarDecl *VD, CallStackFrame *Frame,
                              APValue *&Result, const LValue *LVal) {

// If this is a parameter to an active constexpr function call, perform
// argument substitution.
if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) {
  // Assume arguments of a potential constant expression are unknown
  // constant expressions.
  if (Info.checkingPotentialConstantExpression())
    return false;
  if (!Frame || !Frame->Arguments) {
    Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
    return false;
  }
  Result = &Frame->Arguments[PVD->getFunctionScopeIndex()];
  return true;
}

// If this is a local variable, dig out its value.
if (Frame) {
  Result = LVal ? Frame->getTemporary(VD, LVal->getLValueVersion())
                : Frame->getCurrentTemporary(VD);
  if (!Result) {
    // Assume variables referenced within a lambda's call operator that were
    // not declared within the call operator are captures and during checking
    // of a potential constant expression, assume they are unknown constant
    // expressions.
    assert(isLambdaCallOperator(Frame->Callee) &&((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext
() != Frame->Callee || VD->isInitCapture()) && "missing value for local variable"
) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2787, __PRETTY_FUNCTION__))
           (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) &&((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext
() != Frame->Callee || VD->isInitCapture()) && "missing value for local variable"
) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2787, __PRETTY_FUNCTION__))
           "missing value for local variable")((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext
() != Frame->Callee || VD->isInitCapture()) && "missing value for local variable"
) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2787, __PRETTY_FUNCTION__));
    if (Info.checkingPotentialConstantExpression())
      return false;
    // FIXME: implement capture evaluation during constant expr evaluation.
    Info.FFDiag(E->getBeginLoc(),
                diag::note_unimplemented_constexpr_lambda_feature_ast)
        << "captures not currently allowed";
    return false;
  }
  return true;
}

// Dig out the initializer, and use the declaration which it's attached to.
const Expr *Init = VD->getAnyInitializer(VD);
if (!Init || Init->isValueDependent()) {
  // If we're checking a potential constant expression, the variable could be
  // initialized later.
  if (!Info.checkingPotentialConstantExpression())
    Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

// If we're currently evaluating the initializer of this declaration, use that
// in-flight value.
if (Info.EvaluatingDecl.dyn_cast<const ValueDecl*>() == VD) {
  Result = Info.EvaluatingDeclValue;
  return true;
}

// Never evaluate the initializer of a weak variable. We can't be sure that
// this is the definition which will be used.
if (VD->isWeak()) {
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

// Check that we can fold the initializer. In C++, we will have already done
// this in the cases where it matters for conformance.
SmallVector<PartialDiagnosticAt, 8> Notes;
if (!VD->evaluateValue(Notes)) {
  Info.FFDiag(E, diag::note_constexpr_var_init_non_constant,
            Notes.size() + 1) << VD;
  Info.Note(VD->getLocation(), diag::note_declared_at);
  Info.addNotes(Notes);
  return false;
} else if (!VD->checkInitIsICE()) {
  Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant,
               Notes.size() + 1) << VD;
  Info.Note(VD->getLocation(), diag::note_declared_at);
  Info.addNotes(Notes);
}

Result = VD->getEvaluatedValue();
return true;
2841}

2843static bool IsConstNonVolatile(QualType T) {
Qualifiers Quals = T.getQualifiers();
return Quals.hasConst() && !Quals.hasVolatile();
2846}

2848/// Get the base index of the given base class within an APValue representing
2849/// the given derived class.
2850static unsigned getBaseIndex(const CXXRecordDecl *Derived,
                           const CXXRecordDecl *Base) {
Base = Base->getCanonicalDecl();
unsigned Index = 0;
for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(),
       E = Derived->bases_end(); I != E; ++I, ++Index) {
  if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base)
    return Index;
}

llvm_unreachable("base class missing from derived class's bases list")::llvm::llvm_unreachable_internal("base class missing from derived class's bases list"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2860);
2861}

2863/// Extract the value of a character from a string literal.
2864static APSInt extractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit,
                                          uint64_t Index) {
assert(!isa<SourceLocExpr>(Lit) &&((!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral"
) ? static_cast<void> (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2867, __PRETTY_FUNCTION__))
       "SourceLocExpr should have already been converted to a StringLiteral")((!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral"
) ? static_cast<void> (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2867, __PRETTY_FUNCTION__));

// FIXME: Support MakeStringConstant
if (const auto *ObjCEnc = dyn_cast<ObjCEncodeExpr>(Lit)) {
  std::string Str;
  Info.Ctx.getObjCEncodingForType(ObjCEnc->getEncodedType(), Str);
  assert(Index <= Str.size() && "Index too large")((Index <= Str.size() && "Index too large") ? static_cast
<void> (0) : __assert_fail ("Index <= Str.size() && \"Index too large\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2873, __PRETTY_FUNCTION__));
  return APSInt::getUnsigned(Str.c_str()[Index]);
}

if (auto PE = dyn_cast<PredefinedExpr>(Lit))
  Lit = PE->getFunctionName();
const StringLiteral *S = cast<StringLiteral>(Lit);
const ConstantArrayType *CAT =
    Info.Ctx.getAsConstantArrayType(S->getType());
assert(CAT && "string literal isn't an array")((CAT && "string literal isn't an array") ? static_cast
<void> (0) : __assert_fail ("CAT && \"string literal isn't an array\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2882, __PRETTY_FUNCTION__));
QualType CharType = CAT->getElementType();
assert(CharType->isIntegerType() && "unexpected character type")((CharType->isIntegerType() && "unexpected character type"
) ? static_cast<void> (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2884, __PRETTY_FUNCTION__));

APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(),
             CharType->isUnsignedIntegerType());
if (Index < S->getLength())
  Value = S->getCodeUnit(Index);
return Value;
2891}

2893// Expand a string literal into an array of characters.
2894//
2895// FIXME: This is inefficient; we should probably introduce something similar
2896// to the LLVM ConstantDataArray to make this cheaper.
2897static void expandStringLiteral(EvalInfo &Info, const StringLiteral *S,
                              APValue &Result,
                              QualType AllocType = QualType()) {
const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(
    AllocType.isNull() ? S->getType() : AllocType);
assert(CAT && "string literal isn't an array")((CAT && "string literal isn't an array") ? static_cast
<void> (0) : __assert_fail ("CAT && \"string literal isn't an array\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2902, __PRETTY_FUNCTION__));
QualType CharType = CAT->getElementType();
assert(CharType->isIntegerType() && "unexpected character type")((CharType->isIntegerType() && "unexpected character type"
) ? static_cast<void> (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2904, __PRETTY_FUNCTION__));

unsigned Elts = CAT->getSize().getZExtValue();
Result = APValue(APValue::UninitArray(),
                 std::min(S->getLength(), Elts), Elts);
APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(),
             CharType->isUnsignedIntegerType());
if (Result.hasArrayFiller())
  Result.getArrayFiller() = APValue(Value);
for (unsigned I = 0, N = Result.getArrayInitializedElts(); I != N; ++I) {
  Value = S->getCodeUnit(I);
  Result.getArrayInitializedElt(I) = APValue(Value);
}
2917}

2919// Expand an array so that it has more than Index filled elements.
2920static void expandArray(APValue &Array, unsigned Index) {
unsigned Size = Array.getArraySize();
assert(Index < Size)((Index < Size) ? static_cast<void> (0) : __assert_fail
 ("Index < Size", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 2922, __PRETTY_FUNCTION__));

// Always at least double the number of elements for which we store a value.
unsigned OldElts = Array.getArrayInitializedElts();
unsigned NewElts = std::max(Index+1, OldElts * 2);
NewElts = std::min(Size, std::max(NewElts, 8u));

// Copy the data across.
APValue NewValue(APValue::UninitArray(), NewElts, Size);
for (unsigned I = 0; I != OldElts; ++I)
  NewValue.getArrayInitializedElt(I).swap(Array.getArrayInitializedElt(I));
for (unsigned I = OldElts; I != NewElts; ++I)
  NewValue.getArrayInitializedElt(I) = Array.getArrayFiller();
if (NewValue.hasArrayFiller())
  NewValue.getArrayFiller() = Array.getArrayFiller();
Array.swap(NewValue);
2938}

2940/// Determine whether a type would actually be read by an lvalue-to-rvalue
2941/// conversion. If it's of class type, we may assume that the copy operation
2942/// is trivial. Note that this is never true for a union type with fields
2943/// (because the copy always "reads" the active member) and always true for
2944/// a non-class type.
2945static bool isReadByLvalueToRvalueConversion(QualType T) {
CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
if (!RD || (RD->isUnion() && !RD->field_empty()))
  return true;
if (RD->isEmpty())
  return false;

for (auto *Field : RD->fields())
  if (isReadByLvalueToRvalueConversion(Field->getType()))
    return true;

for (auto &BaseSpec : RD->bases())
  if (isReadByLvalueToRvalueConversion(BaseSpec.getType()))
    return true;

return false;
2961}

2963/// Diagnose an attempt to read from any unreadable field within the specified
2964/// type, which might be a class type.
2965static bool diagnoseMutableFields(EvalInfo &Info, const Expr *E, AccessKinds AK,
                                QualType T) {
CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
if (!RD)
  return false;

if (!RD->hasMutableFields())
  return false;

for (auto *Field : RD->fields()) {
  // If we're actually going to read this field in some way, then it can't
  // be mutable. If we're in a union, then assigning to a mutable field
  // (even an empty one) can change the active member, so that's not OK.
  // FIXME: Add core issue number for the union case.
  if (Field->isMutable() &&
      (RD->isUnion() || isReadByLvalueToRvalueConversion(Field->getType()))) {
    Info.FFDiag(E, diag::note_constexpr_access_mutable, 1) << AK << Field;
    Info.Note(Field->getLocation(), diag::note_declared_at);
    return true;
  }

  if (diagnoseMutableFields(Info, E, AK, Field->getType()))
    return true;
}

for (auto &BaseSpec : RD->bases())
  if (diagnoseMutableFields(Info, E, AK, BaseSpec.getType()))
    return true;

// All mutable fields were empty, and thus not actually read.
return false;
2996}

2998static bool lifetimeStartedInEvaluation(EvalInfo &Info,
                                      APValue::LValueBase Base,
                                      bool MutableSubobject = false) {
// A temporary we created.
if (Base.getCallIndex())
  return true;

auto *Evaluating = Info.EvaluatingDecl.dyn_cast<const ValueDecl*>();
if (!Evaluating)
  return false;

auto *BaseD = Base.dyn_cast<const ValueDecl*>();

switch (Info.IsEvaluatingDecl) {
case EvalInfo::EvaluatingDeclKind::None:
  return false;

case EvalInfo::EvaluatingDeclKind::Ctor:
  // The variable whose initializer we're evaluating.
  if (BaseD)
    return declaresSameEntity(Evaluating, BaseD);

  // A temporary lifetime-extended by the variable whose initializer we're
  // evaluating.
  if (auto *BaseE = Base.dyn_cast<const Expr *>())
    if (auto *BaseMTE = dyn_cast<MaterializeTemporaryExpr>(BaseE))
      return declaresSameEntity(BaseMTE->getExtendingDecl(), Evaluating);
  return false;

case EvalInfo::EvaluatingDeclKind::Dtor:
  // C++2a [expr.const]p6:
  //   [during constant destruction] the lifetime of a and its non-mutable
  //   subobjects (but not its mutable subobjects) [are] considered to start
  //   within e.
  //
  // FIXME: We can meaningfully extend this to cover non-const objects, but
  // we will need special handling: we should be able to access only
  // subobjects of such objects that are themselves declared const.
  if (!BaseD ||
      !(BaseD->getType().isConstQualified() ||
        BaseD->getType()->isReferenceType()) ||
      MutableSubobject)
    return false;
  return declaresSameEntity(Evaluating, BaseD);
}

llvm_unreachable("unknown evaluating decl kind")::llvm::llvm_unreachable_internal("unknown evaluating decl kind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3044);
3045}

3047namespace {
3048/// A handle to a complete object (an object that is not a subobject of
3049/// another object).
3050struct CompleteObject {
/// The identity of the object.
APValue::LValueBase Base;
/// The value of the complete object.
APValue *Value;
/// The type of the complete object.
QualType Type;

CompleteObject() : Value(nullptr) {}
CompleteObject(APValue::LValueBase Base, APValue *Value, QualType Type)
    : Base(Base), Value(Value), Type(Type) {}

bool mayAccessMutableMembers(EvalInfo &Info, AccessKinds AK) const {
  // In C++14 onwards, it is permitted to read a mutable member whose
  // lifetime began within the evaluation.
  // FIXME: Should we also allow this in C++11?
  if (!Info.getLangOpts().CPlusPlus14)
    return false;
  return lifetimeStartedInEvaluation(Info, Base, /*MutableSubobject*/true);
}

explicit operator bool() const { return !Type.isNull(); }
3072};
3073} // end anonymous namespace

3075static QualType getSubobjectType(QualType ObjType, QualType SubobjType,
                               bool IsMutable = false) {
// C++ [basic.type.qualifier]p1:
// - A const object is an object of type const T or a non-mutable subobject
//   of a const object.
if (ObjType.isConstQualified() && !IsMutable)
  SubobjType.addConst();
// - A volatile object is an object of type const T or a subobject of a
//   volatile object.
if (ObjType.isVolatileQualified())
  SubobjType.addVolatile();
return SubobjType;
3087}

3089/// Find the designated sub-object of an rvalue.
3090template<typename SubobjectHandler>
3091typename SubobjectHandler::result_type
3092findSubobject(EvalInfo &Info, const Expr *E, const CompleteObject &Obj,
            const SubobjectDesignator &Sub, SubobjectHandler &handler) {
if (Sub.Invalid)
  // A diagnostic will have already been produced.
  return handler.failed();
if (Sub.isOnePastTheEnd() || Sub.isMostDerivedAnUnsizedArray()) {
  if (Info.getLangOpts().CPlusPlus11)
    Info.FFDiag(E, Sub.isOnePastTheEnd()
                       ? diag::note_constexpr_access_past_end
                       : diag::note_constexpr_access_unsized_array)
        << handler.AccessKind;
  else
    Info.FFDiag(E);
  return handler.failed();
}

APValue *O = Obj.Value;
QualType ObjType = Obj.Type;
const FieldDecl *LastField = nullptr;
const FieldDecl *VolatileField = nullptr;

// Walk the designator's path to find the subobject.
for (unsigned I = 0, N = Sub.Entries.size(); /**/; ++I) {
  // Reading an indeterminate value is undefined, but assigning over one is OK.
  if (O->isAbsent() ||
      (O->isIndeterminate() && handler.AccessKind != AK_Assign &&
       handler.AccessKind != AK_ReadObjectRepresentation)) {
    if (!Info.checkingPotentialConstantExpression())
      Info.FFDiag(E, diag::note_constexpr_access_uninit)
          << handler.AccessKind << O->isIndeterminate();
    return handler.failed();
  }

  // C++ [class.ctor]p5, C++ [class.dtor]p5:
  //    const and volatile semantics are not applied on an object under
  //    {con,de}struction.
  if ((ObjType.isConstQualified() || ObjType.isVolatileQualified()) &&
      ObjType->isRecordType() &&
      Info.isEvaluatingCtorDtor(
          Obj.Base, llvm::makeArrayRef(Sub.Entries.begin(),
                                       Sub.Entries.begin() + I)) !=
                        ConstructionPhase::None) {
    ObjType = Info.Ctx.getCanonicalType(ObjType);
    ObjType.removeLocalConst();
    ObjType.removeLocalVolatile();
  }

  // If this is our last pass, check that the final object type is OK.
  if (I == N || (I == N - 1 && ObjType->isAnyComplexType())) {
    // Accesses to volatile objects are prohibited.
    if (ObjType.isVolatileQualified() && isFormalAccess(handler.AccessKind)) {
      if (Info.getLangOpts().CPlusPlus) {
        int DiagKind;
        SourceLocation Loc;
        const NamedDecl *Decl = nullptr;
        if (VolatileField) {
          DiagKind = 2;
          Loc = VolatileField->getLocation();
          Decl = VolatileField;
        } else if (auto *VD = Obj.Base.dyn_cast<const ValueDecl*>()) {
          DiagKind = 1;
          Loc = VD->getLocation();
          Decl = VD;
        } else {
          DiagKind = 0;
          if (auto *E = Obj.Base.dyn_cast<const Expr *>())
            Loc = E->getExprLoc();
        }
        Info.FFDiag(E, diag::note_constexpr_access_volatile_obj, 1)
            << handler.AccessKind << DiagKind << Decl;
        Info.Note(Loc, diag::note_constexpr_volatile_here) << DiagKind;
      } else {
        Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
      }
      return handler.failed();
    }

    // If we are reading an object of class type, there may still be more
    // things we need to check: if there are any mutable subobjects, we
    // cannot perform this read. (This only happens when performing a trivial
    // copy or assignment.)
    if (ObjType->isRecordType() &&
        !Obj.mayAccessMutableMembers(Info, handler.AccessKind) &&
        diagnoseMutableFields(Info, E, handler.AccessKind, ObjType))
      return handler.failed();
  }

  if (I == N) {
    if (!handler.found(*O, ObjType))
      return false;

    // If we modified a bit-field, truncate it to the right width.
    if (isModification(handler.AccessKind) &&
        LastField && LastField->isBitField() &&
        !truncateBitfieldValue(Info, E, *O, LastField))
      return false;

    return true;
  }

  LastField = nullptr;
  if (ObjType->isArrayType()) {
    // Next subobject is an array element.
    const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType);
    assert(CAT && "vla in literal type?")((CAT && "vla in literal type?") ? static_cast<void
> (0) : __assert_fail ("CAT && \"vla in literal type?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3196, __PRETTY_FUNCTION__));
    uint64_t Index = Sub.Entries[I].getAsArrayIndex();
    if (CAT->getSize().ule(Index)) {
      // Note, it should not be possible to form a pointer with a valid
      // designator which points more than one past the end of the array.
      if (Info.getLangOpts().CPlusPlus11)
        Info.FFDiag(E, diag::note_constexpr_access_past_end)
          << handler.AccessKind;
      else
        Info.FFDiag(E);
      return handler.failed();
    }

    ObjType = CAT->getElementType();

    if (O->getArrayInitializedElts() > Index)
      O = &O->getArrayInitializedElt(Index);
    else if (!isRead(handler.AccessKind)) {
      expandArray(*O, Index);
      O = &O->getArrayInitializedElt(Index);
    } else
      O = &O->getArrayFiller();
  } else if (ObjType->isAnyComplexType()) {
    // Next subobject is a complex number.
    uint64_t Index = Sub.Entries[I].getAsArrayIndex();
    if (Index > 1) {
      if (Info.getLangOpts().CPlusPlus11)
        Info.FFDiag(E, diag::note_constexpr_access_past_end)
          << handler.AccessKind;
      else
        Info.FFDiag(E);
      return handler.failed();
    }

    ObjType = getSubobjectType(
        ObjType, ObjType->castAs<ComplexType>()->getElementType());

    assert(I == N - 1 && "extracting subobject of scalar?")((I == N - 1 && "extracting subobject of scalar?") ? static_cast
<void> (0) : __assert_fail ("I == N - 1 && \"extracting subobject of scalar?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3233, __PRETTY_FUNCTION__));
    if (O->isComplexInt()) {
      return handler.found(Index ? O->getComplexIntImag()
                                 : O->getComplexIntReal(), ObjType);
    } else {
      assert(O->isComplexFloat())((O->isComplexFloat()) ? static_cast<void> (0) : __assert_fail
 ("O->isComplexFloat()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3238, __PRETTY_FUNCTION__));
      return handler.found(Index ? O->getComplexFloatImag()
                                 : O->getComplexFloatReal(), ObjType);
    }
  } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) {
    if (Field->isMutable() &&
        !Obj.mayAccessMutableMembers(Info, handler.AccessKind)) {
      Info.FFDiag(E, diag::note_constexpr_access_mutable, 1)
        << handler.AccessKind << Field;
      Info.Note(Field->getLocation(), diag::note_declared_at);
      return handler.failed();
    }

    // Next subobject is a class, struct or union field.
    RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl();
    if (RD->isUnion()) {
      const FieldDecl *UnionField = O->getUnionField();
      if (!UnionField ||
          UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) {
        // FIXME: If O->getUnionValue() is absent, report that there's no
        // active union member rather than reporting the prior active union
        // member. We'll need to fix nullptr_t to not use APValue() as its
        // representation first.
        Info.FFDiag(E, diag::note_constexpr_access_inactive_union_member)
          << handler.AccessKind << Field << !UnionField << UnionField;
        return handler.failed();
      }
      O = &O->getUnionValue();
    } else
      O = &O->getStructField(Field->getFieldIndex());

    ObjType = getSubobjectType(ObjType, Field->getType(), Field->isMutable());
    LastField = Field;
    if (Field->getType().isVolatileQualified())
      VolatileField = Field;
  } else {
    // Next subobject is a base class.
    const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl();
    const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]);
    O = &O->getStructBase(getBaseIndex(Derived, Base));

    ObjType = getSubobjectType(ObjType, Info.Ctx.getRecordType(Base));
  }
}
3282}

3284namespace {
3285struct ExtractSubobjectHandler {
EvalInfo &Info;
const Expr *E;
APValue &Result;
const AccessKinds AccessKind;

typedef bool result_type;
bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  Result = Subobj;
  if (AccessKind == AK_ReadObjectRepresentation)
    return true;
  return CheckFullyInitialized(Info, E->getExprLoc(), SubobjType, Result);
}
bool found(APSInt &Value, QualType SubobjType) {
  Result = APValue(Value);
  return true;
}
bool found(APFloat &Value, QualType SubobjType) {
  Result = APValue(Value);
  return true;
}
3307};
3308} // end anonymous namespace

3310/// Extract the designated sub-object of an rvalue.
3311static bool extractSubobject(EvalInfo &Info, const Expr *E,
                           const CompleteObject &Obj,
                           const SubobjectDesignator &Sub, APValue &Result,
                           AccessKinds AK = AK_Read) {
assert(AK == AK_Read || AK == AK_ReadObjectRepresentation)((AK == AK_Read || AK == AK_ReadObjectRepresentation) ? static_cast
<void> (0) : __assert_fail ("AK == AK_Read || AK == AK_ReadObjectRepresentation"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3315, __PRETTY_FUNCTION__));
ExtractSubobjectHandler Handler = {Info, E, Result, AK};
return findSubobject(Info, E, Obj, Sub, Handler);
3318}

3320namespace {
3321struct ModifySubobjectHandler {
EvalInfo &Info;
APValue &NewVal;
const Expr *E;

typedef bool result_type;
static const AccessKinds AccessKind = AK_Assign;

bool checkConst(QualType QT) {
  // Assigning to a const object has undefined behavior.
  if (QT.isConstQualified()) {
    Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT;
    return false;
  }
  return true;
}

bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;
  // We've been given ownership of NewVal, so just swap it in.
  Subobj.swap(NewVal);
  return true;
}
bool found(APSInt &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;
  if (!NewVal.isInt()) {
    // Maybe trying to write a cast pointer value into a complex?
    Info.FFDiag(E);
    return false;
  }
  Value = NewVal.getInt();
  return true;
}
bool found(APFloat &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;
  Value = NewVal.getFloat();
  return true;
}
3363};
3364} // end anonymous namespace

3366const AccessKinds ModifySubobjectHandler::AccessKind;

3368/// Update the designated sub-object of an rvalue to the given value.
3369static bool modifySubobject(EvalInfo &Info, const Expr *E,
                          const CompleteObject &Obj,
                          const SubobjectDesignator &Sub,
                          APValue &NewVal) {
ModifySubobjectHandler Handler = { Info, NewVal, E };
return findSubobject(Info, E, Obj, Sub, Handler);
3375}

3377/// Find the position where two subobject designators diverge, or equivalently
3378/// the length of the common initial subsequence.
3379static unsigned FindDesignatorMismatch(QualType ObjType,
                                     const SubobjectDesignator &A,
                                     const SubobjectDesignator &B,
                                     bool &WasArrayIndex) {
unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size());
for (/**/; I != N; ++I) {
  if (!ObjType.isNull() &&
      (ObjType->isArrayType() || ObjType->isAnyComplexType())) {
    // Next subobject is an array element.
    if (A.Entries[I].getAsArrayIndex() != B.Entries[I].getAsArrayIndex()) {
      WasArrayIndex = true;
      return I;
    }
    if (ObjType->isAnyComplexType())
      ObjType = ObjType->castAs<ComplexType>()->getElementType();
    else
      ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType();
  } else {
    if (A.Entries[I].getAsBaseOrMember() !=
        B.Entries[I].getAsBaseOrMember()) {
      WasArrayIndex = false;
      return I;
    }
    if (const FieldDecl *FD = getAsField(A.Entries[I]))
      // Next subobject is a field.
      ObjType = FD->getType();
    else
      // Next subobject is a base class.
      ObjType = QualType();
  }
}
WasArrayIndex = false;
return I;
3412}

3414/// Determine whether the given subobject designators refer to elements of the
3415/// same array object.
3416static bool AreElementsOfSameArray(QualType ObjType,
                                 const SubobjectDesignator &A,
                                 const SubobjectDesignator &B) {
if (A.Entries.size() != B.Entries.size())
  return false;

bool IsArray = A.MostDerivedIsArrayElement;
if (IsArray && A.MostDerivedPathLength != A.Entries.size())
  // A is a subobject of the array element.
  return false;

// If A (and B) designates an array element, the last entry will be the array
// index. That doesn't have to match. Otherwise, we're in the 'implicit array
// of length 1' case, and the entire path must match.
bool WasArrayIndex;
unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex);
return CommonLength >= A.Entries.size() - IsArray;
3433}

3435/// Find the complete object to which an LValue refers.
3436static CompleteObject findCompleteObject(EvalInfo &Info, const Expr *E,
                                       AccessKinds AK, const LValue &LVal,
                                       QualType LValType) {
if (LVal.InvalidBase) {
  Info.FFDiag(E);
  return CompleteObject();
}

if (!LVal.Base) {
  Info.FFDiag(E, diag::note_constexpr_access_null) << AK;
  return CompleteObject();
}

CallStackFrame *Frame = nullptr;
unsigned Depth = 0;
if (LVal.getLValueCallIndex()) {
  std::tie(Frame, Depth) =
      Info.getCallFrameAndDepth(LVal.getLValueCallIndex());
  if (!Frame) {
    Info.FFDiag(E, diag::note_constexpr_lifetime_ended, 1)
      << AK << LVal.Base.is<const ValueDecl*>();
    NoteLValueLocation(Info, LVal.Base);
    return CompleteObject();
  }
}

bool IsAccess = isAnyAccess(AK);

// C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type
// is not a constant expression (even if the object is non-volatile). We also
// apply this rule to C++98, in order to conform to the expected 'volatile'
// semantics.
if (isFormalAccess(AK) && LValType.isVolatileQualified()) {
  if (Info.getLangOpts().CPlusPlus)
    Info.FFDiag(E, diag::note_constexpr_access_volatile_type)
      << AK << LValType;
  else
    Info.FFDiag(E);
  return CompleteObject();
}

// Compute value storage location and type of base object.
APValue *BaseVal = nullptr;
QualType BaseType = getType(LVal.Base);

if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) {
  // In C++98, const, non-volatile integers initialized with ICEs are ICEs.
  // In C++11, constexpr, non-volatile variables initialized with constant
  // expressions are constant expressions too. Inside constexpr functions,
  // parameters are constant expressions even if they're non-const.
  // In C++1y, objects local to a constant expression (those with a Frame) are
  // both readable and writable inside constant expressions.
  // In C, such things can also be folded, although they are not ICEs.
  const VarDecl *VD = dyn_cast<VarDecl>(D);
  if (VD) {
    if (const VarDecl *VDef = VD->getDefinition(Info.Ctx))
      VD = VDef;
  }
  if (!VD || VD->isInvalidDecl()) {
    Info.FFDiag(E);
    return CompleteObject();
  }

  // Unless we're looking at a local variable or argument in a constexpr call,
  // the variable we're reading must be const.
  if (!Frame) {
    if (Info.getLangOpts().CPlusPlus14 &&
        lifetimeStartedInEvaluation(Info, LVal.Base)) {
      // OK, we can read and modify an object if we're in the process of
      // evaluating its initializer, because its lifetime began in this
      // evaluation.
    } else if (isModification(AK)) {
      // All the remaining cases do not permit modification of the object.
      Info.FFDiag(E, diag::note_constexpr_modify_global);
      return CompleteObject();
    } else if (VD->isConstexpr()) {
      // OK, we can read this variable.
    } else if (BaseType->isIntegralOrEnumerationType()) {
      // In OpenCL if a variable is in constant address space it is a const
      // value.
      if (!(BaseType.isConstQualified() ||
            (Info.getLangOpts().OpenCL &&
             BaseType.getAddressSpace() == LangAS::opencl_constant))) {
        if (!IsAccess)
          return CompleteObject(LVal.getLValueBase(), nullptr, BaseType);
        if (Info.getLangOpts().CPlusPlus) {
          Info.FFDiag(E, diag::note_constexpr_ltor_non_const_int, 1) << VD;
          Info.Note(VD->getLocation(), diag::note_declared_at);
        } else {
          Info.FFDiag(E);
        }
        return CompleteObject();
      }
    } else if (!IsAccess) {
      return CompleteObject(LVal.getLValueBase(), nullptr, BaseType);
    } else if (BaseType->isFloatingType() && BaseType.isConstQualified()) {
      // We support folding of const floating-point types, in order to make
      // static const data members of such types (supported as an extension)
      // more useful.
      if (Info.getLangOpts().CPlusPlus11) {
        Info.CCEDiag(E, diag::note_constexpr_ltor_non_constexpr, 1) << VD;
        Info.Note(VD->getLocation(), diag::note_declared_at);
      } else {
        Info.CCEDiag(E);
      }
    } else if (BaseType.isConstQualified() && VD->hasDefinition(Info.Ctx)) {
      Info.CCEDiag(E, diag::note_constexpr_ltor_non_constexpr) << VD;
      // Keep evaluating to see what we can do.
    } else {
      // FIXME: Allow folding of values of any literal type in all languages.
      if (Info.checkingPotentialConstantExpression() &&
          VD->getType().isConstQualified() && !VD->hasDefinition(Info.Ctx)) {
        // The definition of this variable could be constexpr. We can't
        // access it right now, but may be able to in future.
      } else if (Info.getLangOpts().CPlusPlus11) {
        Info.FFDiag(E, diag::note_constexpr_ltor_non_constexpr, 1) << VD;
        Info.Note(VD->getLocation(), diag::note_declared_at);
      } else {
        Info.FFDiag(E);
      }
      return CompleteObject();
    }
  }

  if (!evaluateVarDeclInit(Info, E, VD, Frame, BaseVal, &LVal))
    return CompleteObject();
} else if (DynamicAllocLValue DA = LVal.Base.dyn_cast<DynamicAllocLValue>()) {
  Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA);
  if (!Alloc) {
    Info.FFDiag(E, diag::note_constexpr_access_deleted_object) << AK;
    return CompleteObject();
  }
  return CompleteObject(LVal.Base, &(*Alloc)->Value,
                        LVal.Base.getDynamicAllocType());
} else {
  const Expr *Base = LVal.Base.dyn_cast<const Expr*>();

  if (!Frame) {
    if (const MaterializeTemporaryExpr *MTE =
            dyn_cast_or_null<MaterializeTemporaryExpr>(Base)) {
      assert(MTE->getStorageDuration() == SD_Static &&((MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary"
) ? static_cast<void> (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3577, __PRETTY_FUNCTION__))
             "should have a frame for a non-global materialized temporary")((MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary"
) ? static_cast<void> (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3577, __PRETTY_FUNCTION__));

      // Per C++1y [expr.const]p2:
      //  an lvalue-to-rvalue conversion [is not allowed unless it applies to]
      //   - a [...] glvalue of integral or enumeration type that refers to
      //     a non-volatile const object [...]
      //   [...]
      //   - a [...] glvalue of literal type that refers to a non-volatile
      //     object whose lifetime began within the evaluation of e.
      //
      // C++11 misses the 'began within the evaluation of e' check and
      // instead allows all temporaries, including things like:
      //   int &&r = 1;
      //   int x = ++r;
      //   constexpr int k = r;
      // Therefore we use the C++14 rules in C++11 too.
      //
      // Note that temporaries whose lifetimes began while evaluating a
      // variable's constructor are not usable while evaluating the
      // corresponding destructor, not even if they're of const-qualified
      // types.
      if (!(BaseType.isConstQualified() &&
            BaseType->isIntegralOrEnumerationType()) &&
          !lifetimeStartedInEvaluation(Info, LVal.Base)) {
        if (!IsAccess)
          return CompleteObject(LVal.getLValueBase(), nullptr, BaseType);
        Info.FFDiag(E, diag::note_constexpr_access_static_temporary, 1) << AK;
        Info.Note(MTE->getExprLoc(), diag::note_constexpr_temporary_here);
        return CompleteObject();
      }

      BaseVal = Info.Ctx.getMaterializedTemporaryValue(MTE, false);
      assert(BaseVal && "got reference to unevaluated temporary")((BaseVal && "got reference to unevaluated temporary"
) ? static_cast<void> (0) : __assert_fail ("BaseVal && \"got reference to unevaluated temporary\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3609, __PRETTY_FUNCTION__));
    } else {
      if (!IsAccess)
        return CompleteObject(LVal.getLValueBase(), nullptr, BaseType);
      APValue Val;
      LVal.moveInto(Val);
      Info.FFDiag(E, diag::note_constexpr_access_unreadable_object)
          << AK
          << Val.getAsString(Info.Ctx,
                             Info.Ctx.getLValueReferenceType(LValType));
      NoteLValueLocation(Info, LVal.Base);
      return CompleteObject();
    }
  } else {
    BaseVal = Frame->getTemporary(Base, LVal.Base.getVersion());
    assert(BaseVal && "missing value for temporary")((BaseVal && "missing value for temporary") ? static_cast
<void> (0) : __assert_fail ("BaseVal && \"missing value for temporary\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3624, __PRETTY_FUNCTION__));
  }
}

// In C++14, we can't safely access any mutable state when we might be
// evaluating after an unmodeled side effect.
//
// FIXME: Not all local state is mutable. Allow local constant subobjects
// to be read here (but take care with 'mutable' fields).
if ((Frame && Info.getLangOpts().CPlusPlus14 &&
     Info.EvalStatus.HasSideEffects) ||
    (isModification(AK) && Depth < Info.SpeculativeEvaluationDepth))
  return CompleteObject();

return CompleteObject(LVal.getLValueBase(), BaseVal, BaseType);
3639}

3641/// Perform an lvalue-to-rvalue conversion on the given glvalue. This
3642/// can also be used for 'lvalue-to-lvalue' conversions for looking up the
3643/// glvalue referred to by an entity of reference type.
3644///
3645/// \param Info - Information about the ongoing evaluation.
3646/// \param Conv - The expression for which we are performing the conversion.
3647///               Used for diagnostics.
3648/// \param Type - The type of the glvalue (before stripping cv-qualifiers in the
3649///               case of a non-class type).
3650/// \param LVal - The glvalue on which we are attempting to perform this action.
3651/// \param RVal - The produced value will be placed here.
3652/// \param WantObjectRepresentation - If true, we're looking for the object
3653///               representation rather than the value, and in particular,
3654///               there is no requirement that the result be fully initialized.
3655static bool
3656handleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, QualType Type,
                             const LValue &LVal, APValue &RVal,
                             bool WantObjectRepresentation = false) {
if (LVal.Designator.Invalid)
  return false;

// Check for special cases where there is no existing APValue to look at.
const Expr *Base = LVal.Base.dyn_cast<const Expr*>();

AccessKinds AK =
    WantObjectRepresentation ? AK_ReadObjectRepresentation : AK_Read;

if (Base && !LVal.getLValueCallIndex() && !Type.isVolatileQualified()) {
  if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Base)) {
    // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the
    // initializer until now for such expressions. Such an expression can't be
    // an ICE in C, so this only matters for fold.
    if (Type.isVolatileQualified()) {
      Info.FFDiag(Conv);
      return false;
    }
    APValue Lit;
    if (!Evaluate(Lit, Info, CLE->getInitializer()))
      return false;
    CompleteObject LitObj(LVal.Base, &Lit, Base->getType());
    return extractSubobject(Info, Conv, LitObj, LVal.Designator, RVal, AK);
  } else if (isa<StringLiteral>(Base) || isa<PredefinedExpr>(Base)) {
    // Special-case character extraction so we don't have to construct an
    // APValue for the whole string.
    assert(LVal.Designator.Entries.size() <= 1 &&((LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals"
) ? static_cast<void> (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3686, __PRETTY_FUNCTION__))
           "Can only read characters from string literals")((LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals"
) ? static_cast<void> (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 3686, __PRETTY_FUNCTION__));
    if (LVal.Designator.Entries.empty()) {
      // Fail for now for LValue to RValue conversion of an array.
      // (This shouldn't show up in C/C++, but it could be triggered by a
      // weird EvaluateAsRValue call from a tool.)
      Info.FFDiag(Conv);
      return false;
    }
    if (LVal.Designator.isOnePastTheEnd()) {
      if (Info.getLangOpts().CPlusPlus11)
        Info.FFDiag(Conv, diag::note_constexpr_access_past_end) << AK;
      else
        Info.FFDiag(Conv);
      return false;
    }
    uint64_t CharIndex = LVal.Designator.Entries[0].getAsArrayIndex();
    RVal = APValue(extractStringLiteralCharacter(Info, Base, CharIndex));
    return true;
  }
}

CompleteObject Obj = findCompleteObject(Info, Conv, AK, LVal, Type);
return Obj && extractSubobject(Info, Conv, Obj, LVal.Designator, RVal, AK);
3709}

3711/// Perform an assignment of Val to LVal. Takes ownership of Val.
3712static bool handleAssignment(EvalInfo &Info, const Expr *E, const LValue &LVal,
                           QualType LValType, APValue &Val) {
if (LVal.Designator.Invalid)
  return false;

if (!Info.getLangOpts().CPlusPlus14) {
  Info.FFDiag(E);
  return false;
}

CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType);
return Obj && modifySubobject(Info, E, Obj, LVal.Designator, Val);
3724}

3726namespace {
3727struct CompoundAssignSubobjectHandler {
EvalInfo &Info;
const Expr *E;
QualType PromotedLHSType;
BinaryOperatorKind Opcode;
const APValue &RHS;

static const AccessKinds AccessKind = AK_Assign;

typedef bool result_type;

bool checkConst(QualType QT) {
  // Assigning to a const object has undefined behavior.
  if (QT.isConstQualified()) {
    Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT;
    return false;
  }
  return true;
}

bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  switch (Subobj.getKind()) {
  case APValue::Int:
    return found(Subobj.getInt(), SubobjType);
  case APValue::Float:
    return found(Subobj.getFloat(), SubobjType);
  case APValue::ComplexInt:
  case APValue::ComplexFloat:
    // FIXME: Implement complex compound assignment.
    Info.FFDiag(E);
    return false;
  case APValue::LValue:
    return foundPointer(Subobj, SubobjType);
  default:
    // FIXME: can this happen?
    Info.FFDiag(E);
    return false;
  }
}
bool found(APSInt &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  if (!SubobjType->isIntegerType()) {
    // We don't support compound assignment on integer-cast-to-pointer
    // values.
    Info.FFDiag(E);
    return false;
  }

  if (RHS.isInt()) {
    APSInt LHS =
        HandleIntToIntCast(Info, E, PromotedLHSType, SubobjType, Value);
    if (!handleIntIntBinOp(Info, E, LHS, Opcode, RHS.getInt(), LHS))
      return false;
    Value = HandleIntToIntCast(Info, E, SubobjType, PromotedLHSType, LHS);
    return true;
  } else if (RHS.isFloat()) {
    APFloat FValue(0.0);
    return HandleIntToFloatCast(Info, E, SubobjType, Value, PromotedLHSType,
                                FValue) &&
           handleFloatFloatBinOp(Info, E, FValue, Opcode, RHS.getFloat()) &&
           HandleFloatToIntCast(Info, E, PromotedLHSType, FValue, SubobjType,
                                Value);
  }

  Info.FFDiag(E);
  return false;
}
bool found(APFloat &Value, QualType SubobjType) {
  return checkConst(SubobjType) &&
         HandleFloatToFloatCast(Info, E, SubobjType, PromotedLHSType,
                                Value) &&
         handleFloatFloatBinOp(Info, E, Value, Opcode, RHS.getFloat()) &&
         HandleFloatToFloatCast(Info, E, PromotedLHSType, SubobjType, Value);
}
bool foundPointer(APValue &Subobj, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  QualType PointeeType;
  if (const PointerType *PT = SubobjType->getAs<PointerType>())
    PointeeType = PT->getPointeeType();

  if (PointeeType.isNull() || !RHS.isInt() ||
      (Opcode != BO_Add && Opcode != BO_Sub)) {
    Info.FFDiag(E);
    return false;
  }

  APSInt Offset = RHS.getInt();
  if (Opcode == BO_Sub)
    negateAsSigned(Offset);

  LValue LVal;
  LVal.setFrom(Info.Ctx, Subobj);
  if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType, Offset))
    return false;
  LVal.moveInto(Subobj);
  return true;
}
3829};
3830} // end anonymous namespace

3832const AccessKinds CompoundAssignSubobjectHandler::AccessKind;

3834/// Perform a compound assignment of LVal <op>= RVal.
3835static bool handleCompoundAssignment(
  EvalInfo &Info, const Expr *E,
  const LValue &LVal, QualType LValType, QualType PromotedLValType,
  BinaryOperatorKind Opcode, const APValue &RVal) {
if (LVal.Designator.Invalid)
  return false;

if (!Info.getLangOpts().CPlusPlus14) {
  Info.FFDiag(E);
  return false;
}

CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType);
CompoundAssignSubobjectHandler Handler = { Info, E, PromotedLValType, Opcode,
                                           RVal };
return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler);
3851}

3853namespace {
3854struct IncDecSubobjectHandler {
EvalInfo &Info;
const UnaryOperator *E;
AccessKinds AccessKind;
APValue *Old;

typedef bool result_type;

bool checkConst(QualType QT) {
  // Assigning to a const object has undefined behavior.
  if (QT.isConstQualified()) {
    Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT;
    return false;
  }
  return true;
}

bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  // Stash the old value. Also clear Old, so we don't clobber it later
  // if we're post-incrementing a complex.
  if (Old) {
    *Old = Subobj;
    Old = nullptr;
  }

  switch (Subobj.getKind()) {
  case APValue::Int:
    return found(Subobj.getInt(), SubobjType);
  case APValue::Float:
    return found(Subobj.getFloat(), SubobjType);
  case APValue::ComplexInt:
    return found(Subobj.getComplexIntReal(),
                 SubobjType->castAs<ComplexType>()->getElementType()
                   .withCVRQualifiers(SubobjType.getCVRQualifiers()));
  case APValue::ComplexFloat:
    return found(Subobj.getComplexFloatReal(),
                 SubobjType->castAs<ComplexType>()->getElementType()
                   .withCVRQualifiers(SubobjType.getCVRQualifiers()));
  case APValue::LValue:
    return foundPointer(Subobj, SubobjType);
  default:
    // FIXME: can this happen?
    Info.FFDiag(E);
    return false;
  }
}
bool found(APSInt &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  if (!SubobjType->isIntegerType()) {
    // We don't support increment / decrement on integer-cast-to-pointer
    // values.
    Info.FFDiag(E);
    return false;
  }

  if (Old) *Old = APValue(Value);

  // bool arithmetic promotes to int, and the conversion back to bool
  // doesn't reduce mod 2^n, so special-case it.
  if (SubobjType->isBooleanType()) {
    if (AccessKind == AK_Increment)
      Value = 1;
    else
      Value = !Value;
    return true;
  }

  bool WasNegative = Value.isNegative();
  if (AccessKind == AK_Increment) {
    ++Value;

    if (!WasNegative && Value.isNegative() && E->canOverflow()) {
      APSInt ActualValue(Value, /*IsUnsigned*/true);
      return HandleOverflow(Info, E, ActualValue, SubobjType);
    }
  } else {
    --Value;

    if (WasNegative && !Value.isNegative() && E->canOverflow()) {
      unsigned BitWidth = Value.getBitWidth();
      APSInt ActualValue(Value.sext(BitWidth + 1), /*IsUnsigned*/false);
      ActualValue.setBit(BitWidth);
      return HandleOverflow(Info, E, ActualValue, SubobjType);
    }
  }
  return true;
}
bool found(APFloat &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  if (Old) *Old = APValue(Value);

  APFloat One(Value.getSemantics(), 1);
  if (AccessKind == AK_Increment)
    Value.add(One, APFloat::rmNearestTiesToEven);
  else
    Value.subtract(One, APFloat::rmNearestTiesToEven);
  return true;
}
bool foundPointer(APValue &Subobj, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  QualType PointeeType;
  if (const PointerType *PT = SubobjType->getAs<PointerType>())
    PointeeType = PT->getPointeeType();
  else {
    Info.FFDiag(E);
    return false;
  }

  LValue LVal;
  LVal.setFrom(Info.Ctx, Subobj);
  if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType,
                                   AccessKind == AK_Increment ? 1 : -1))
    return false;
  LVal.moveInto(Subobj);
  return true;
}
3977};
3978} // end anonymous namespace

3980/// Perform an increment or decrement on LVal.
3981static bool handleIncDec(EvalInfo &Info, const Expr *E, const LValue &LVal,
                       QualType LValType, bool IsIncrement, APValue *Old) {
if (LVal.Designator.Invalid)
  return false;

if (!Info.getLangOpts().CPlusPlus14) {
  Info.FFDiag(E);
  return false;
}

AccessKinds AK = IsIncrement ? AK_Increment : AK_Decrement;
CompleteObject Obj = findCompleteObject(Info, E, AK, LVal, LValType);
IncDecSubobjectHandler Handler = {Info, cast<UnaryOperator>(E), AK, Old};
return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler);
3995}

3997/// Build an lvalue for the object argument of a member function call.
3998static bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object,
                                 LValue &This) {
if (Object->getType()->isPointerType() && Object->isRValue())
  return EvaluatePointer(Object, This, Info);

if (Object->isGLValue())
  return EvaluateLValue(Object, This, Info);

if (Object->getType()->isLiteralType(Info.Ctx))
  return EvaluateTemporary(Object, This, Info);

Info.FFDiag(Object, diag::note_constexpr_nonliteral) << Object->getType();
return false;
4011}

4013/// HandleMemberPointerAccess - Evaluate a member access operation and build an
4014/// lvalue referring to the result.
4015///
4016/// \param Info - Information about the ongoing evaluation.
4017/// \param LV - An lvalue referring to the base of the member pointer.
4018/// \param RHS - The member pointer expression.
4019/// \param IncludeMember - Specifies whether the member itself is included in
4020///        the resulting LValue subobject designator. This is not possible when
4021///        creating a bound member function.
4022/// \return The field or method declaration to which the member pointer refers,
4023///         or 0 if evaluation fails.
4024static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info,
                                                QualType LVType,
                                                LValue &LV,
                                                const Expr *RHS,
                                                bool IncludeMember = true) {
MemberPtr MemPtr;
if (!EvaluateMemberPointer(RHS, MemPtr, Info))
  return nullptr;

// C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to
// member value, the behavior is undefined.
if (!MemPtr.getDecl()) {
  // FIXME: Specific diagnostic.
  Info.FFDiag(RHS);
  return nullptr;
}

if (MemPtr.isDerivedMember()) {
  // This is a member of some derived class. Truncate LV appropriately.
  // The end of the derived-to-base path for the base object must match the
  // derived-to-base path for the member pointer.
  if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() >
      LV.Designator.Entries.size()) {
    Info.FFDiag(RHS);
    return nullptr;
  }
  unsigned PathLengthToMember =
      LV.Designator.Entries.size() - MemPtr.Path.size();
  for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) {
    const CXXRecordDecl *LVDecl = getAsBaseClass(
        LV.Designator.Entries[PathLengthToMember + I]);
    const CXXRecordDecl *MPDecl = MemPtr.Path[I];
    if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) {
      Info.FFDiag(RHS);
      return nullptr;
    }
  }

  // Truncate the lvalue to the appropriate derived class.
  if (!CastToDerivedClass(Info, RHS, LV, MemPtr.getContainingRecord(),
                          PathLengthToMember))
    return nullptr;
} else if (!MemPtr.Path.empty()) {
  // Extend the LValue path with the member pointer's path.
  LV.Designator.Entries.reserve(LV.Designator.Entries.size() +
                                MemPtr.Path.size() + IncludeMember);

  // Walk down to the appropriate base class.
  if (const PointerType *PT = LVType->getAs<PointerType>())
    LVType = PT->getPointeeType();
  const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl();
  assert(RD && "member pointer access on non-class-type expression")((RD && "member pointer access on non-class-type expression"
) ? static_cast<void> (0) : __assert_fail ("RD && \"member pointer access on non-class-type expression\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4075, __PRETTY_FUNCTION__));
  // The first class in the path is that of the lvalue.
  for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) {
    const CXXRecordDecl *Base = MemPtr.Path[N - I - 1];
    if (!HandleLValueDirectBase(Info, RHS, LV, RD, Base))
      return nullptr;
    RD = Base;
  }
  // Finally cast to the class containing the member.
  if (!HandleLValueDirectBase(Info, RHS, LV, RD,
                              MemPtr.getContainingRecord()))
    return nullptr;
}

// Add the member. Note that we cannot build bound member functions here.
if (IncludeMember) {
  if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) {
    if (!HandleLValueMember(Info, RHS, LV, FD))
      return nullptr;
  } else if (const IndirectFieldDecl *IFD =
               dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) {
    if (!HandleLValueIndirectMember(Info, RHS, LV, IFD))
      return nullptr;
  } else {
    llvm_unreachable("can't construct reference to bound member function")::llvm::llvm_unreachable_internal("can't construct reference to bound member function"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4099);
  }
}

return MemPtr.getDecl();
4104}

4106static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info,
                                                const BinaryOperator *BO,
                                                LValue &LV,
                                                bool IncludeMember = true) {
assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI)((BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI
) ? static_cast<void> (0) : __assert_fail ("BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4110, __PRETTY_FUNCTION__));

if (!EvaluateObjectArgument(Info, BO->getLHS(), LV)) {
  if (Info.noteFailure()) {
    MemberPtr MemPtr;
    EvaluateMemberPointer(BO->getRHS(), MemPtr, Info);
  }
  return nullptr;
}

return HandleMemberPointerAccess(Info, BO->getLHS()->getType(), LV,
                                 BO->getRHS(), IncludeMember);
4122}

4124/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on
4125/// the provided lvalue, which currently refers to the base object.
4126static bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E,
                                  LValue &Result) {
SubobjectDesignator &D = Result.Designator;
if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived))
  return false;

QualType TargetQT = E->getType();
if (const PointerType *PT = TargetQT->getAs<PointerType>())
  TargetQT = PT->getPointeeType();

// Check this cast lands within the final derived-to-base subobject path.
if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) {
  Info.CCEDiag(E, diag::note_constexpr_invalid_downcast)
    << D.MostDerivedType << TargetQT;
  return false;
}

// Check the type of the final cast. We don't need to check the path,
// since a cast can only be formed if the path is unique.
unsigned NewEntriesSize = D.Entries.size() - E->path_size();
const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl();
const CXXRecordDecl *FinalType;
if (NewEntriesSize == D.MostDerivedPathLength)
  FinalType = D.MostDerivedType->getAsCXXRecordDecl();
else
  FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]);
if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) {
  Info.CCEDiag(E, diag::note_constexpr_invalid_downcast)
    << D.MostDerivedType << TargetQT;
  return false;
}

// Truncate the lvalue to the appropriate derived class.
return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize);
4160}

4162/// Get the value to use for a default-initialized object of type T.
4163static APValue getDefaultInitValue(QualType T) {
if (auto *RD = T->getAsCXXRecordDecl()) {
  if (RD->isUnion())
    return APValue((const FieldDecl*)nullptr);

  APValue Struct(APValue::UninitStruct(), RD->getNumBases(),
                 std::distance(RD->field_begin(), RD->field_end()));

  unsigned Index = 0;
  for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
         End = RD->bases_end(); I != End; ++I, ++Index)
    Struct.getStructBase(Index) = getDefaultInitValue(I->getType());

  for (const auto *I : RD->fields()) {
    if (I->isUnnamedBitfield())
      continue;
    Struct.getStructField(I->getFieldIndex()) =
        getDefaultInitValue(I->getType());
  }
  return Struct;
}

if (auto *AT =
        dyn_cast_or_null<ConstantArrayType>(T->getAsArrayTypeUnsafe())) {
  APValue Array(APValue::UninitArray(), 0, AT->getSize().getZExtValue());
  if (Array.hasArrayFiller())
    Array.getArrayFiller() = getDefaultInitValue(AT->getElementType());
  return Array;
}

return APValue::IndeterminateValue();
4194}

4196namespace {
4197enum EvalStmtResult {
/// Evaluation failed.
ESR_Failed,
/// Hit a 'return' statement.
ESR_Returned,
/// Evaluation succeeded.
ESR_Succeeded,
/// Hit a 'continue' statement.
ESR_Continue,
/// Hit a 'break' statement.
ESR_Break,
/// Still scanning for 'case' or 'default' statement.
ESR_CaseNotFound
4210};
4211}

4213static bool EvaluateVarDecl(EvalInfo &Info, const VarDecl *VD) {
// We don't need to evaluate the initializer for a static local.
if (!VD->hasLocalStorage())
  return true;

LValue Result;
APValue &Val =
    Info.CurrentCall->createTemporary(VD, VD->getType(), true, Result);

const Expr *InitE = VD->getInit();
if (!InitE) {
  Val = getDefaultInitValue(VD->getType());
  return true;
}

if (InitE->isValueDependent())
  return false;

if (!EvaluateInPlace(Val, Info, Result, InitE)) {
  // Wipe out any partially-computed value, to allow tracking that this
  // evaluation failed.
  Val = APValue();
  return false;
}

return true;
4239}

4241static bool EvaluateDecl(EvalInfo &Info, const Decl *D) {
bool OK = true;

if (const VarDecl *VD = dyn_cast<VarDecl>(D))
  OK &= EvaluateVarDecl(Info, VD);

if (const DecompositionDecl *DD = dyn_cast<DecompositionDecl>(D))
  for (auto *BD : DD->bindings())
    if (auto *VD = BD->getHoldingVar())
      OK &= EvaluateDecl(Info, VD);

return OK;
4253}


4256/// Evaluate a condition (either a variable declaration or an expression).
4257static bool EvaluateCond(EvalInfo &Info, const VarDecl *CondDecl,
                       const Expr *Cond, bool &Result) {
FullExpressionRAII Scope(Info);
if (CondDecl && !EvaluateDecl(Info, CondDecl))
  return false;
if (!EvaluateAsBooleanCondition(Cond, Result, Info))
  return false;
return Scope.destroy();
4265}

4267namespace {
4268/// A location where the result (returned value) of evaluating a
4269/// statement should be stored.
4270struct StmtResult {
/// The APValue that should be filled in with the returned value.
APValue &Value;
/// The location containing the result, if any (used to support RVO).
const LValue *Slot;
4275};

4277struct TempVersionRAII {
CallStackFrame &Frame;

TempVersionRAII(CallStackFrame &Frame) : Frame(Frame) {
  Frame.pushTempVersion();
}

~TempVersionRAII() {
  Frame.popTempVersion();
}
4287};

4289}

4291static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info,
                                 const Stmt *S,
                                 const SwitchCase *SC = nullptr);

4295/// Evaluate the body of a loop, and translate the result as appropriate.
4296static EvalStmtResult EvaluateLoopBody(StmtResult &Result, EvalInfo &Info,
                                     const Stmt *Body,
                                     const SwitchCase *Case = nullptr) {
BlockScopeRAII Scope(Info);

EvalStmtResult ESR = EvaluateStmt(Result, Info, Body, Case);
if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy())
  ESR = ESR_Failed;

switch (ESR) {
case ESR_Break:
  return ESR_Succeeded;
case ESR_Succeeded:
case ESR_Continue:
  return ESR_Continue;
case ESR_Failed:
case ESR_Returned:
case ESR_CaseNotFound:
  return ESR;
}
llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4316);
4317}

4319/// Evaluate a switch statement.
4320static EvalStmtResult EvaluateSwitch(StmtResult &Result, EvalInfo &Info,
                                   const SwitchStmt *SS) {
BlockScopeRAII Scope(Info);

// Evaluate the switch condition.
APSInt Value;
{
  if (const Stmt *Init = SS->getInit()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, Init);
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && !Scope.destroy())
        ESR = ESR_Failed;
      return ESR;
    }
  }

  FullExpressionRAII CondScope(Info);
  if (SS->getConditionVariable() &&
      !EvaluateDecl(Info, SS->getConditionVariable()))
    return ESR_Failed;
  if (!EvaluateInteger(SS->getCond(), Value, Info))
    return ESR_Failed;
  if (!CondScope.destroy())
    return ESR_Failed;
}

// Find the switch case corresponding to the value of the condition.
// FIXME: Cache this lookup.
const SwitchCase *Found = nullptr;
for (const SwitchCase *SC = SS->getSwitchCaseList(); SC;
     SC = SC->getNextSwitchCase()) {
  if (isa<DefaultStmt>(SC)) {
    Found = SC;
    continue;
  }

  const CaseStmt *CS = cast<CaseStmt>(SC);
  APSInt LHS = CS->getLHS()->EvaluateKnownConstInt(Info.Ctx);
  APSInt RHS = CS->getRHS() ? CS->getRHS()->EvaluateKnownConstInt(Info.Ctx)
                            : LHS;
  if (LHS <= Value && Value <= RHS) {
    Found = SC;
    break;
  }
}

if (!Found)
  return Scope.destroy() ? ESR_Failed : ESR_Succeeded;

// Search the switch body for the switch case and evaluate it from there.
EvalStmtResult ESR = EvaluateStmt(Result, Info, SS->getBody(), Found);
if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy())
  return ESR_Failed;

switch (ESR) {
case ESR_Break:
  return ESR_Succeeded;
case ESR_Succeeded:
case ESR_Continue:
case ESR_Failed:
case ESR_Returned:
  return ESR;
case ESR_CaseNotFound:
  // This can only happen if the switch case is nested within a statement
  // expression. We have no intention of supporting that.
  Info.FFDiag(Found->getBeginLoc(),
              diag::note_constexpr_stmt_expr_unsupported);
  return ESR_Failed;
}
llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4389);
4390}

4392// Evaluate a statement.
4393static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info,
                                 const Stmt *S, const SwitchCase *Case) {
if (!Info.nextStep(S))
  return ESR_Failed;

// If we're hunting down a 'case' or 'default' label, recurse through
// substatements until we hit the label.
if (Case) {
  switch (S->getStmtClass()) {
  case Stmt::CompoundStmtClass:
    // FIXME: Precompute which substatement of a compound statement we
    // would jump to, and go straight there rather than performing a
    // linear scan each time.
  case Stmt::LabelStmtClass:
  case Stmt::AttributedStmtClass:
  case Stmt::DoStmtClass:
    break;

  case Stmt::CaseStmtClass:
  case Stmt::DefaultStmtClass:
    if (Case == S)
      Case = nullptr;
    break;

  case Stmt::IfStmtClass: {
    // FIXME: Precompute which side of an 'if' we would jump to, and go
    // straight there rather than scanning both sides.
    const IfStmt *IS = cast<IfStmt>(S);

    // Wrap the evaluation in a block scope, in case it's a DeclStmt
    // preceded by our switch label.
    BlockScopeRAII Scope(Info);

    // Step into the init statement in case it brings an (uninitialized)
    // variable into scope.
    if (const Stmt *Init = IS->getInit()) {
      EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case);
      if (ESR != ESR_CaseNotFound) {
        assert(ESR != ESR_Succeeded)((ESR != ESR_Succeeded) ? static_cast<void> (0) : __assert_fail
 ("ESR != ESR_Succeeded", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4431, __PRETTY_FUNCTION__));
        return ESR;
      }
    }

    // Condition variable must be initialized if it exists.
    // FIXME: We can skip evaluating the body if there's a condition
    // variable, as there can't be any case labels within it.
    // (The same is true for 'for' statements.)

    EvalStmtResult ESR = EvaluateStmt(Result, Info, IS->getThen(), Case);
    if (ESR == ESR_Failed)
      return ESR;
    if (ESR != ESR_CaseNotFound)
      return Scope.destroy() ? ESR : ESR_Failed;
    if (!IS->getElse())
      return ESR_CaseNotFound;

    ESR = EvaluateStmt(Result, Info, IS->getElse(), Case);
    if (ESR == ESR_Failed)
      return ESR;
    if (ESR != ESR_CaseNotFound)
      return Scope.destroy() ? ESR : ESR_Failed;
    return ESR_CaseNotFound;
  }

  case Stmt::WhileStmtClass: {
    EvalStmtResult ESR =
        EvaluateLoopBody(Result, Info, cast<WhileStmt>(S)->getBody(), Case);
    if (ESR != ESR_Continue)
      return ESR;
    break;
  }

  case Stmt::ForStmtClass: {
    const ForStmt *FS = cast<ForStmt>(S);
    BlockScopeRAII Scope(Info);

    // Step into the init statement in case it brings an (uninitialized)
    // variable into scope.
    if (const Stmt *Init = FS->getInit()) {
      EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case);
      if (ESR != ESR_CaseNotFound) {
        assert(ESR != ESR_Succeeded)((ESR != ESR_Succeeded) ? static_cast<void> (0) : __assert_fail
 ("ESR != ESR_Succeeded", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4474, __PRETTY_FUNCTION__));
        return ESR;
      }
    }

    EvalStmtResult ESR =
        EvaluateLoopBody(Result, Info, FS->getBody(), Case);
    if (ESR != ESR_Continue)
      return ESR;
    if (FS->getInc()) {
      FullExpressionRAII IncScope(Info);
      if (!EvaluateIgnoredValue(Info, FS->getInc()) || !IncScope.destroy())
        return ESR_Failed;
    }
    break;
  }

  case Stmt::DeclStmtClass: {
    // Start the lifetime of any uninitialized variables we encounter. They
    // might be used by the selected branch of the switch.
    const DeclStmt *DS = cast<DeclStmt>(S);
    for (const auto *D : DS->decls()) {
      if (const auto *VD = dyn_cast<VarDecl>(D)) {
        if (VD->hasLocalStorage() && !VD->getInit())
          if (!EvaluateVarDecl(Info, VD))
            return ESR_Failed;
        // FIXME: If the variable has initialization that can't be jumped
        // over, bail out of any immediately-surrounding compound-statement
        // too. There can't be any case labels here.
      }
    }
    return ESR_CaseNotFound;
  }

  default:
    return ESR_CaseNotFound;
  }
}

switch (S->getStmtClass()) {
default:
  if (const Expr *E = dyn_cast<Expr>(S)) {
    // Don't bother evaluating beyond an expression-statement which couldn't
    // be evaluated.
    // FIXME: Do we need the FullExpressionRAII object here?
    // VisitExprWithCleanups should create one when necessary.
    FullExpressionRAII Scope(Info);
    if (!EvaluateIgnoredValue(Info, E) || !Scope.destroy())
      return ESR_Failed;
    return ESR_Succeeded;
  }

  Info.FFDiag(S->getBeginLoc());
  return ESR_Failed;

case Stmt::NullStmtClass:
  return ESR_Succeeded;

case Stmt::DeclStmtClass: {
  const DeclStmt *DS = cast<DeclStmt>(S);
  for (const auto *D : DS->decls()) {
    // Each declaration initialization is its own full-expression.
    FullExpressionRAII Scope(Info);
    if (!EvaluateDecl(Info, D) && !Info.noteFailure())
      return ESR_Failed;
    if (!Scope.destroy())
      return ESR_Failed;
  }
  return ESR_Succeeded;
}

case Stmt::ReturnStmtClass: {
  const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue();
  FullExpressionRAII Scope(Info);
  if (RetExpr &&
      !(Result.Slot
            ? EvaluateInPlace(Result.Value, Info, *Result.Slot, RetExpr)
            : Evaluate(Result.Value, Info, RetExpr)))
    return ESR_Failed;
  return Scope.destroy() ? ESR_Returned : ESR_Failed;
}

case Stmt::CompoundStmtClass: {
  BlockScopeRAII Scope(Info);

  const CompoundStmt *CS = cast<CompoundStmt>(S);
  for (const auto *BI : CS->body()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, BI, Case);
    if (ESR == ESR_Succeeded)
      Case = nullptr;
    else if (ESR != ESR_CaseNotFound) {
      if (ESR != ESR_Failed && !Scope.destroy())
        return ESR_Failed;
      return ESR;
    }
  }
  if (Case)
    return ESR_CaseNotFound;
  return Scope.destroy() ? ESR_Succeeded : ESR_Failed;
}

case Stmt::IfStmtClass: {
  const IfStmt *IS = cast<IfStmt>(S);

  // Evaluate the condition, as either a var decl or as an expression.
  BlockScopeRAII Scope(Info);
  if (const Stmt *Init = IS->getInit()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, Init);
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && !Scope.destroy())
        return ESR_Failed;
      return ESR;
    }
  }
  bool Cond;
  if (!EvaluateCond(Info, IS->getConditionVariable(), IS->getCond(), Cond))
    return ESR_Failed;

  if (const Stmt *SubStmt = Cond ? IS->getThen() : IS->getElse()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, SubStmt);
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && !Scope.destroy())
        return ESR_Failed;
      return ESR;
    }
  }
  return Scope.destroy() ? ESR_Succeeded : ESR_Failed;
}

case Stmt::WhileStmtClass: {
  const WhileStmt *WS = cast<WhileStmt>(S);
  while (true) {
    BlockScopeRAII Scope(Info);
    bool Continue;
    if (!EvaluateCond(Info, WS->getConditionVariable(), WS->getCond(),
                      Continue))
      return ESR_Failed;
    if (!Continue)
      break;

    EvalStmtResult ESR = EvaluateLoopBody(Result, Info, WS->getBody());
    if (ESR != ESR_Continue) {
      if (ESR != ESR_Failed && !Scope.destroy())
        return ESR_Failed;
      return ESR;
    }
    if (!Scope.destroy())
      return ESR_Failed;
  }
  return ESR_Succeeded;
}

case Stmt::DoStmtClass: {
  const DoStmt *DS = cast<DoStmt>(S);
  bool Continue;
  do {
    EvalStmtResult ESR = EvaluateLoopBody(Result, Info, DS->getBody(), Case);
    if (ESR != ESR_Continue)
      return ESR;
    Case = nullptr;

    FullExpressionRAII CondScope(Info);
    if (!EvaluateAsBooleanCondition(DS->getCond(), Continue, Info) ||
        !CondScope.destroy())
      return ESR_Failed;
  } while (Continue);
  return ESR_Succeeded;
}

case Stmt::ForStmtClass: {
  const ForStmt *FS = cast<ForStmt>(S);
  BlockScopeRAII ForScope(Info);
  if (FS->getInit()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit());
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && !ForScope.destroy())
        return ESR_Failed;
      return ESR;
    }
  }
  while (true) {
    BlockScopeRAII IterScope(Info);
    bool Continue = true;
    if (FS->getCond() && !EvaluateCond(Info, FS->getConditionVariable(),
                                       FS->getCond(), Continue))
      return ESR_Failed;
    if (!Continue)
      break;

    EvalStmtResult ESR = EvaluateLoopBody(Result, Info, FS->getBody());
    if (ESR != ESR_Continue) {
      if (ESR != ESR_Failed && (!IterScope.destroy() || !ForScope.destroy()))
        return ESR_Failed;
      return ESR;
    }

    if (FS->getInc()) {
      FullExpressionRAII IncScope(Info);
      if (!EvaluateIgnoredValue(Info, FS->getInc()) || !IncScope.destroy())
        return ESR_Failed;
    }

    if (!IterScope.destroy())
      return ESR_Failed;
  }
  return ForScope.destroy() ? ESR_Succeeded : ESR_Failed;
}

case Stmt::CXXForRangeStmtClass: {
  const CXXForRangeStmt *FS = cast<CXXForRangeStmt>(S);
  BlockScopeRAII Scope(Info);

  // Evaluate the init-statement if present.
  if (FS->getInit()) {
    EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit());
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && !Scope.destroy())
        return ESR_Failed;
      return ESR;
    }
  }

  // Initialize the __range variable.
  EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getRangeStmt());
  if (ESR != ESR_Succeeded) {
    if (ESR != ESR_Failed && !Scope.destroy())
      return ESR_Failed;
    return ESR;
  }

  // Create the __begin and __end iterators.
  ESR = EvaluateStmt(Result, Info, FS->getBeginStmt());
  if (ESR != ESR_Succeeded) {
    if (ESR != ESR_Failed && !Scope.destroy())
      return ESR_Failed;
    return ESR;
  }
  ESR = EvaluateStmt(Result, Info, FS->getEndStmt());
  if (ESR != ESR_Succeeded) {
    if (ESR != ESR_Failed && !Scope.destroy())
      return ESR_Failed;
    return ESR;
  }

  while (true) {
    // Condition: __begin != __end.
    {
      bool Continue = true;
      FullExpressionRAII CondExpr(Info);
      if (!EvaluateAsBooleanCondition(FS->getCond(), Continue, Info))
        return ESR_Failed;
      if (!Continue)
        break;
    }

    // User's variable declaration, initialized by *__begin.
    BlockScopeRAII InnerScope(Info);
    ESR = EvaluateStmt(Result, Info, FS->getLoopVarStmt());
    if (ESR != ESR_Succeeded) {
      if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy()))
        return ESR_Failed;
      return ESR;
    }

    // Loop body.
    ESR = EvaluateLoopBody(Result, Info, FS->getBody());
    if (ESR != ESR_Continue) {
      if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy()))
        return ESR_Failed;
      return ESR;
    }

    // Increment: ++__begin
    if (!EvaluateIgnoredValue(Info, FS->getInc()))
      return ESR_Failed;

    if (!InnerScope.destroy())
      return ESR_Failed;
  }

  return Scope.destroy() ? ESR_Succeeded : ESR_Failed;
}

case Stmt::SwitchStmtClass:
  return EvaluateSwitch(Result, Info, cast<SwitchStmt>(S));

case Stmt::ContinueStmtClass:
  return ESR_Continue;

case Stmt::BreakStmtClass:
  return ESR_Break;

case Stmt::LabelStmtClass:
  return EvaluateStmt(Result, Info, cast<LabelStmt>(S)->getSubStmt(), Case);

case Stmt::AttributedStmtClass:
  // As a general principle, C++11 attributes can be ignored without
  // any semantic impact.
  return EvaluateStmt(Result, Info, cast<AttributedStmt>(S)->getSubStmt(),
                      Case);

case Stmt::CaseStmtClass:
case Stmt::DefaultStmtClass:
  return EvaluateStmt(Result, Info, cast<SwitchCase>(S)->getSubStmt(), Case);
case Stmt::CXXTryStmtClass:
  // Evaluate try blocks by evaluating all sub statements.
  return EvaluateStmt(Result, Info, cast<CXXTryStmt>(S)->getTryBlock(), Case);
}
4782}

4784/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial
4785/// default constructor. If so, we'll fold it whether or not it's marked as
4786/// constexpr. If it is marked as constexpr, we will never implicitly define it,
4787/// so we need special handling.
4788static bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc,
                                         const CXXConstructorDecl *CD,
                                         bool IsValueInitialization) {
if (!CD->isTrivial() || !CD->isDefaultConstructor())
  return false;

// Value-initialization does not call a trivial default constructor, so such a
// call is a core constant expression whether or not the constructor is
// constexpr.
if (!CD->isConstexpr() && !IsValueInitialization) {
  if (Info.getLangOpts().CPlusPlus11) {
    // FIXME: If DiagDecl is an implicitly-declared special member function,
    // we should be much more explicit about why it's not constexpr.
    Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1)
      << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD;
    Info.Note(CD->getLocation(), diag::note_declared_at);
  } else {
    Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr);
  }
}
return true;
4809}

4811/// CheckConstexprFunction - Check that a function can be called in a constant
4812/// expression.
4813static bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc,
                                 const FunctionDecl *Declaration,
                                 const FunctionDecl *Definition,
                                 const Stmt *Body) {
// Potential constant expressions can contain calls to declared, but not yet
// defined, constexpr functions.
if (Info.checkingPotentialConstantExpression() && !Definition &&
    Declaration->isConstexpr())
  return false;

// Bail out if the function declaration itself is invalid.  We will
// have produced a relevant diagnostic while parsing it, so just
// note the problematic sub-expression.
if (Declaration->isInvalidDecl()) {
  Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

// DR1872: An instantiated virtual constexpr function can't be called in a
// constant expression (prior to C++20). We can still constant-fold such a
// call.
if (!Info.Ctx.getLangOpts().CPlusPlus2a && isa<CXXMethodDecl>(Declaration) &&
    cast<CXXMethodDecl>(Declaration)->isVirtual())
  Info.CCEDiag(CallLoc, diag::note_constexpr_virtual_call);

if (Definition && Definition->isInvalidDecl()) {
  Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

// Can we evaluate this function call?
if (Definition && Definition->isConstexpr() && Body)
  return true;

if (Info.getLangOpts().CPlusPlus11) {
  const FunctionDecl *DiagDecl = Definition ? Definition : Declaration;

  // If this function is not constexpr because it is an inherited
  // non-constexpr constructor, diagnose that directly.
  auto *CD = dyn_cast<CXXConstructorDecl>(DiagDecl);
  if (CD && CD->isInheritingConstructor()) {
    auto *Inherited = CD->getInheritedConstructor().getConstructor();
    if (!Inherited->isConstexpr())
      DiagDecl = CD = Inherited;
  }

  // FIXME: If DiagDecl is an implicitly-declared special member function
  // or an inheriting constructor, we should be much more explicit about why
  // it's not constexpr.
  if (CD && CD->isInheritingConstructor())
    Info.FFDiag(CallLoc, diag::note_constexpr_invalid_inhctor, 1)
      << CD->getInheritedConstructor().getConstructor()->getParent();
  else
    Info.FFDiag(CallLoc, diag::note_constexpr_invalid_function, 1)
      << DiagDecl->isConstexpr() << (bool)CD << DiagDecl;
  Info.Note(DiagDecl->getLocation(), diag::note_declared_at);
} else {
  Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr);
}
return false;
4873}

4875namespace {
4876struct CheckDynamicTypeHandler {
AccessKinds AccessKind;
typedef bool result_type;
bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) { return true; }
bool found(APSInt &Value, QualType SubobjType) { return true; }
bool found(APFloat &Value, QualType SubobjType) { return true; }
4883};
4884} // end anonymous namespace

4886/// Check that we can access the notional vptr of an object / determine its
4887/// dynamic type.
4888static bool checkDynamicType(EvalInfo &Info, const Expr *E, const LValue &This,
                           AccessKinds AK, bool Polymorphic) {
if (This.Designator.Invalid)
  return false;

CompleteObject Obj = findCompleteObject(Info, E, AK, This, QualType());

if (!Obj)
  return false;

if (!Obj.Value) {
  // The object is not usable in constant expressions, so we can't inspect
  // its value to see if it's in-lifetime or what the active union members
  // are. We can still check for a one-past-the-end lvalue.
  if (This.Designator.isOnePastTheEnd() ||
      This.Designator.isMostDerivedAnUnsizedArray()) {
    Info.FFDiag(E, This.Designator.isOnePastTheEnd()
                       ? diag::note_constexpr_access_past_end
                       : diag::note_constexpr_access_unsized_array)
        << AK;
    return false;
  } else if (Polymorphic) {
    // Conservatively refuse to perform a polymorphic operation if we would
    // not be able to read a notional 'vptr' value.
    APValue Val;
    This.moveInto(Val);
    QualType StarThisType =
        Info.Ctx.getLValueReferenceType(This.Designator.getType(Info.Ctx));
    Info.FFDiag(E, diag::note_constexpr_polymorphic_unknown_dynamic_type)
        << AK << Val.getAsString(Info.Ctx, StarThisType);
    return false;
  }
  return true;
}

CheckDynamicTypeHandler Handler{AK};
return Obj && findSubobject(Info, E, Obj, This.Designator, Handler);
4925}

4927/// Check that the pointee of the 'this' pointer in a member function call is
4928/// either within its lifetime or in its period of construction or destruction.
4929static bool
4930checkNonVirtualMemberCallThisPointer(EvalInfo &Info, const Expr *E,
                                   const LValue &This,
                                   const CXXMethodDecl *NamedMember) {
return checkDynamicType(
    Info, E, This,
    isa<CXXDestructorDecl>(NamedMember) ? AK_Destroy : AK_MemberCall, false);
4936}

4938struct DynamicType {
/// The dynamic class type of the object.
const CXXRecordDecl *Type;
/// The corresponding path length in the lvalue.
unsigned PathLength;
4943};

4945static const CXXRecordDecl *getBaseClassType(SubobjectDesignator &Designator,
                                           unsigned PathLength) {
assert(PathLength >= Designator.MostDerivedPathLength && PathLength <=((PathLength >= Designator.MostDerivedPathLength &&
 PathLength <= Designator.Entries.size() && "invalid path length"
) ? static_cast<void> (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4948, __PRETTY_FUNCTION__))
    Designator.Entries.size() && "invalid path length")((PathLength >= Designator.MostDerivedPathLength &&
 PathLength <= Designator.Entries.size() && "invalid path length"
) ? static_cast<void> (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 4948, __PRETTY_FUNCTION__));
return (PathLength == Designator.MostDerivedPathLength)
           ? Designator.MostDerivedType->getAsCXXRecordDecl()
           : getAsBaseClass(Designator.Entries[PathLength - 1]);
4952}

4954/// Determine the dynamic type of an object.
4955static Optional<DynamicType> ComputeDynamicType(EvalInfo &Info, const Expr *E,
                                              LValue &This, AccessKinds AK) {
// If we don't have an lvalue denoting an object of class type, there is no
// meaningful dynamic type. (We consider objects of non-class type to have no
// dynamic type.)
if (!checkDynamicType(Info, E, This, AK, true))
  return None;

// Refuse to compute a dynamic type in the presence of virtual bases. This
// shouldn't happen other than in constant-folding situations, since literal
// types can't have virtual bases.
//
// Note that consumers of DynamicType assume that the type has no virtual
// bases, and will need modifications if this restriction is relaxed.
const CXXRecordDecl *Class =
    This.Designator.MostDerivedType->getAsCXXRecordDecl();
if (!Class || Class->getNumVBases()) {
  Info.FFDiag(E);
  return None;
}

// FIXME: For very deep class hierarchies, it might be beneficial to use a
// binary search here instead. But the overwhelmingly common case is that
// we're not in the middle of a constructor, so it probably doesn't matter
// in practice.
ArrayRef<APValue::LValuePathEntry> Path = This.Designator.Entries;
for (unsigned PathLength = This.Designator.MostDerivedPathLength;
     PathLength <= Path.size(); ++PathLength) {
  switch (Info.isEvaluatingCtorDtor(This.getLValueBase(),
                                    Path.slice(0, PathLength))) {
  case ConstructionPhase::Bases:
  case ConstructionPhase::DestroyingBases:
    // We're constructing or destroying a base class. This is not the dynamic
    // type.
    break;

  case ConstructionPhase::None:
  case ConstructionPhase::AfterBases:
  case ConstructionPhase::Destroying:
    // We've finished constructing the base classes and not yet started
    // destroying them again, so this is the dynamic type.
    return DynamicType{getBaseClassType(This.Designator, PathLength),
                       PathLength};
  }
}

// CWG issue 1517: we're constructing a base class of the object described by
// 'This', so that object has not yet begun its period of construction and
// any polymorphic operation on it results in undefined behavior.
Info.FFDiag(E);
return None;
5006}

5008/// Perform virtual dispatch.
5009static const CXXMethodDecl *HandleVirtualDispatch(
  EvalInfo &Info, const Expr *E, LValue &This, const CXXMethodDecl *Found,
  llvm::SmallVectorImpl<QualType> &CovariantAdjustmentPath) {
Optional<DynamicType> DynType = ComputeDynamicType(
    Info, E, This,
    isa<CXXDestructorDecl>(Found) ? AK_Destroy : AK_MemberCall);
if (!DynType)
  return nullptr;

// Find the final overrider. It must be declared in one of the classes on the
// path from the dynamic type to the static type.
// FIXME: If we ever allow literal types to have virtual base classes, that
// won't be true.
const CXXMethodDecl *Callee = Found;
unsigned PathLength = DynType->PathLength;
for (/**/; PathLength <= This.Designator.Entries.size(); ++PathLength) {
  const CXXRecordDecl *Class = getBaseClassType(This.Designator, PathLength);
  const CXXMethodDecl *Overrider =
      Found->getCorrespondingMethodDeclaredInClass(Class, false);
  if (Overrider) {
    Callee = Overrider;
    break;
  }
}

// C++2a [class.abstract]p6:
//   the effect of making a virtual call to a pure virtual function [...] is
//   undefined
if (Callee->isPure()) {
  Info.FFDiag(E, diag::note_constexpr_pure_virtual_call, 1) << Callee;
  Info.Note(Callee->getLocation(), diag::note_declared_at);
  return nullptr;
}

// If necessary, walk the rest of the path to determine the sequence of
// covariant adjustment steps to apply.
if (!Info.Ctx.hasSameUnqualifiedType(Callee->getReturnType(),
                                     Found->getReturnType())) {
  CovariantAdjustmentPath.push_back(Callee->getReturnType());
  for (unsigned CovariantPathLength = PathLength + 1;
       CovariantPathLength != This.Designator.Entries.size();
       ++CovariantPathLength) {
    const CXXRecordDecl *NextClass =
        getBaseClassType(This.Designator, CovariantPathLength);
    const CXXMethodDecl *Next =
        Found->getCorrespondingMethodDeclaredInClass(NextClass, false);
    if (Next && !Info.Ctx.hasSameUnqualifiedType(
                    Next->getReturnType(), CovariantAdjustmentPath.back()))
      CovariantAdjustmentPath.push_back(Next->getReturnType());
  }
  if (!Info.Ctx.hasSameUnqualifiedType(Found->getReturnType(),
                                       CovariantAdjustmentPath.back()))
    CovariantAdjustmentPath.push_back(Found->getReturnType());
}

// Perform 'this' adjustment.
if (!CastToDerivedClass(Info, E, This, Callee->getParent(), PathLength))
  return nullptr;

return Callee;
5069}

5071/// Perform the adjustment from a value returned by a virtual function to
5072/// a value of the statically expected type, which may be a pointer or
5073/// reference to a base class of the returned type.
5074static bool HandleCovariantReturnAdjustment(EvalInfo &Info, const Expr *E,
                                          APValue &Result,
                                          ArrayRef<QualType> Path) {
assert(Result.isLValue() &&((Result.isLValue() && "unexpected kind of APValue for covariant return"
) ? static_cast<void> (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5078, __PRETTY_FUNCTION__))
       "unexpected kind of APValue for covariant return")((Result.isLValue() && "unexpected kind of APValue for covariant return"
) ? static_cast<void> (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5078, __PRETTY_FUNCTION__));
if (Result.isNullPointer())
  return true;

LValue LVal;
LVal.setFrom(Info.Ctx, Result);

const CXXRecordDecl *OldClass = Path[0]->getPointeeCXXRecordDecl();
for (unsigned I = 1; I != Path.size(); ++I) {
  const CXXRecordDecl *NewClass = Path[I]->getPointeeCXXRecordDecl();
  assert(OldClass && NewClass && "unexpected kind of covariant return")((OldClass && NewClass && "unexpected kind of covariant return"
) ? static_cast<void> (0) : __assert_fail ("OldClass && NewClass && \"unexpected kind of covariant return\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5088, __PRETTY_FUNCTION__));
  if (OldClass != NewClass &&
      !CastToBaseClass(Info, E, LVal, OldClass, NewClass))
    return false;
  OldClass = NewClass;
}

LVal.moveInto(Result);
return true;
5097}

5099/// Determine whether \p Base, which is known to be a direct base class of
5100/// \p Derived, is a public base class.
5101static bool isBaseClassPublic(const CXXRecordDecl *Derived,
                            const CXXRecordDecl *Base) {
for (const CXXBaseSpecifier &BaseSpec : Derived->bases()) {
  auto *BaseClass = BaseSpec.getType()->getAsCXXRecordDecl();
  if (BaseClass && declaresSameEntity(BaseClass, Base))
    return BaseSpec.getAccessSpecifier() == AS_public;
}
llvm_unreachable("Base is not a direct base of Derived")::llvm::llvm_unreachable_internal("Base is not a direct base of Derived"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5108);
5109}

5111/// Apply the given dynamic cast operation on the provided lvalue.
5112///
5113/// This implements the hard case of dynamic_cast, requiring a "runtime check"
5114/// to find a suitable target subobject.
5115static bool HandleDynamicCast(EvalInfo &Info, const ExplicitCastExpr *E,
                            LValue &Ptr) {
// We can't do anything with a non-symbolic pointer value.
SubobjectDesignator &D = Ptr.Designator;
if (D.Invalid)
  return false;

// C++ [expr.dynamic.cast]p6:
//   If v is a null pointer value, the result is a null pointer value.
if (Ptr.isNullPointer() && !E->isGLValue())
  return true;

// For all the other cases, we need the pointer to point to an object within
// its lifetime / period of construction / destruction, and we need to know
// its dynamic type.
Optional<DynamicType> DynType =
    ComputeDynamicType(Info, E, Ptr, AK_DynamicCast);
if (!DynType)
  return false;

// C++ [expr.dynamic.cast]p7:
//   If T is "pointer to cv void", then the result is a pointer to the most
//   derived object
if (E->getType()->isVoidPointerType())
  return CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength);

const CXXRecordDecl *C = E->getTypeAsWritten()->getPointeeCXXRecordDecl();
assert(C && "dynamic_cast target is not void pointer nor class")((C && "dynamic_cast target is not void pointer nor class"
) ? static_cast<void> (0) : __assert_fail ("C && \"dynamic_cast target is not void pointer nor class\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5142, __PRETTY_FUNCTION__));
CanQualType CQT = Info.Ctx.getCanonicalType(Info.Ctx.getRecordType(C));

auto RuntimeCheckFailed = [&] (CXXBasePaths *Paths) {
  // C++ [expr.dynamic.cast]p9:
  if (!E->isGLValue()) {
    //   The value of a failed cast to pointer type is the null pointer value
    //   of the required result type.
    auto TargetVal = Info.Ctx.getTargetNullPointerValue(E->getType());
    Ptr.setNull(E->getType(), TargetVal);
    return true;
  }

  //   A failed cast to reference type throws [...] std::bad_cast.
  unsigned DiagKind;
  if (!Paths && (declaresSameEntity(DynType->Type, C) ||
                 DynType->Type->isDerivedFrom(C)))
    DiagKind = 0;
  else if (!Paths || Paths->begin() == Paths->end())
    DiagKind = 1;
  else if (Paths->isAmbiguous(CQT))
    DiagKind = 2;
  else {
    assert(Paths->front().Access != AS_public && "why did the cast fail?")((Paths->front().Access != AS_public && "why did the cast fail?"
) ? static_cast<void> (0) : __assert_fail ("Paths->front().Access != AS_public && \"why did the cast fail?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5165, __PRETTY_FUNCTION__));
    DiagKind = 3;
  }
  Info.FFDiag(E, diag::note_constexpr_dynamic_cast_to_reference_failed)
      << DiagKind << Ptr.Designator.getType(Info.Ctx)
      << Info.Ctx.getRecordType(DynType->Type)
      << E->getType().getUnqualifiedType();
  return false;
};

// Runtime check, phase 1:
//   Walk from the base subobject towards the derived object looking for the
//   target type.
for (int PathLength = Ptr.Designator.Entries.size();
     PathLength >= (int)DynType->PathLength; --PathLength) {
  const CXXRecordDecl *Class = getBaseClassType(Ptr.Designator, PathLength);
  if (declaresSameEntity(Class, C))
    return CastToDerivedClass(Info, E, Ptr, Class, PathLength);
  // We can only walk across public inheritance edges.
  if (PathLength > (int)DynType->PathLength &&
      !isBaseClassPublic(getBaseClassType(Ptr.Designator, PathLength - 1),
                         Class))
    return RuntimeCheckFailed(nullptr);
}

// Runtime check, phase 2:
//   Search the dynamic type for an unambiguous public base of type C.
CXXBasePaths Paths(/*FindAmbiguities=*/true,
                   /*RecordPaths=*/true, /*DetectVirtual=*/false);
if (DynType->Type->isDerivedFrom(C, Paths) && !Paths.isAmbiguous(CQT) &&
    Paths.front().Access == AS_public) {
  // Downcast to the dynamic type...
  if (!CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength))
    return false;
  // ... then upcast to the chosen base class subobject.
  for (CXXBasePathElement &Elem : Paths.front())
    if (!HandleLValueBase(Info, E, Ptr, Elem.Class, Elem.Base))
      return false;
  return true;
}

// Otherwise, the runtime check fails.
return RuntimeCheckFailed(&Paths);
5208}

5210namespace {
5211struct StartLifetimeOfUnionMemberHandler {
const FieldDecl *Field;

static const AccessKinds AccessKind = AK_Assign;

typedef bool result_type;
bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  // We are supposed to perform no initialization but begin the lifetime of
  // the object. We interpret that as meaning to do what default
  // initialization of the object would do if all constructors involved were
  // trivial:
  //  * All base, non-variant member, and array element subobjects' lifetimes
  //    begin
  //  * No variant members' lifetimes begin
  //  * All scalar subobjects whose lifetimes begin have indeterminate values
  assert(SubobjType->isUnionType())((SubobjType->isUnionType()) ? static_cast<void> (0)
 : __assert_fail ("SubobjType->isUnionType()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5227, __PRETTY_FUNCTION__));
  if (!declaresSameEntity(Subobj.getUnionField(), Field) ||
      !Subobj.getUnionValue().hasValue())
    Subobj.setUnion(Field, getDefaultInitValue(Field->getType()));
  return true;
}
bool found(APSInt &Value, QualType SubobjType) {
  llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5234);
}
bool found(APFloat &Value, QualType SubobjType) {
  llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5237);
}
5239};
5240} // end anonymous namespace

5242const AccessKinds StartLifetimeOfUnionMemberHandler::AccessKind;

5244/// Handle a builtin simple-assignment or a call to a trivial assignment
5245/// operator whose left-hand side might involve a union member access. If it
5246/// does, implicitly start the lifetime of any accessed union elements per
5247/// C++20 [class.union]5.
5248static bool HandleUnionActiveMemberChange(EvalInfo &Info, const Expr *LHSExpr,
                                        const LValue &LHS) {
if (LHS.InvalidBase || LHS.Designator.Invalid)
  return false;

llvm::SmallVector<std::pair<unsigned, const FieldDecl*>, 4> UnionPathLengths;
// C++ [class.union]p5:
//   define the set S(E) of subexpressions of E as follows:
unsigned PathLength = LHS.Designator.Entries.size();
for (const Expr *E = LHSExpr; E != nullptr;) {
  //   -- If E is of the form A.B, S(E) contains the elements of S(A)...
  if (auto *ME = dyn_cast<MemberExpr>(E)) {
    auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
    // Note that we can't implicitly start the lifetime of a reference,
    // so we don't need to proceed any further if we reach one.
    if (!FD || FD->getType()->isReferenceType())
      break;

    //    ... and also contains A.B if B names a union member
    if (FD->getParent()->isUnion())
      UnionPathLengths.push_back({PathLength - 1, FD});

    E = ME->getBase();
    --PathLength;
    assert(declaresSameEntity(FD,((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .
getAsBaseOrMember().getPointer())) ? static_cast<void> (
0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5274, __PRETTY_FUNCTION__))
                              LHS.Designator.Entries[PathLength]((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .
getAsBaseOrMember().getPointer())) ? static_cast<void> (
0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5274, __PRETTY_FUNCTION__))
                                  .getAsBaseOrMember().getPointer()))((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .
getAsBaseOrMember().getPointer())) ? static_cast<void> (
0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5274, __PRETTY_FUNCTION__));

    //   -- If E is of the form A[B] and is interpreted as a built-in array
    //      subscripting operator, S(E) is [S(the array operand, if any)].
  } else if (auto *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
    // Step over an ArrayToPointerDecay implicit cast.
    auto *Base = ASE->getBase()->IgnoreImplicit();
    if (!Base->getType()->isArrayType())
      break;

    E = Base;
    --PathLength;

  } else if (auto *ICE = dyn_cast<ImplicitCastExpr>(E)) {
    // Step over a derived-to-base conversion.
    E = ICE->getSubExpr();
    if (ICE->getCastKind() == CK_NoOp)
      continue;
    if (ICE->getCastKind() != CK_DerivedToBase &&
        ICE->getCastKind() != CK_UncheckedDerivedToBase)
      break;
    // Walk path backwards as we walk up from the base to the derived class.
    for (const CXXBaseSpecifier *Elt : llvm::reverse(ICE->path())) {
      --PathLength;
      (void)Elt;
      assert(declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(),((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl
(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer
())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5301, __PRETTY_FUNCTION__))
                                LHS.Designator.Entries[PathLength]((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl
(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer
())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5301, __PRETTY_FUNCTION__))
                                    .getAsBaseOrMember().getPointer()))((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl
(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer
())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5301, __PRETTY_FUNCTION__));
    }

  //   -- Otherwise, S(E) is empty.
  } else {
    break;
  }
}

// Common case: no unions' lifetimes are started.
if (UnionPathLengths.empty())
  return true;

//   if modification of X [would access an inactive union member], an object
//   of the type of X is implicitly created
CompleteObject Obj =
    findCompleteObject(Info, LHSExpr, AK_Assign, LHS, LHSExpr->getType());
if (!Obj)
  return false;
for (std::pair<unsigned, const FieldDecl *> LengthAndField :
         llvm::reverse(UnionPathLengths)) {
  // Form a designator for the union object.
  SubobjectDesignator D = LHS.Designator;
  D.truncate(Info.Ctx, LHS.Base, LengthAndField.first);

  StartLifetimeOfUnionMemberHandler StartLifetime{LengthAndField.second};
  if (!findSubobject(Info, LHSExpr, Obj, D, StartLifetime))
    return false;
}

return true;
5332}

5334/// Determine if a class has any fields that might need to be copied by a
5335/// trivial copy or move operation.
5336static bool hasFields(const CXXRecordDecl *RD) {
if (!RD || RD->isEmpty())
  return false;
for (auto *FD : RD->fields()) {
  if (FD->isUnnamedBitfield())
    continue;
  return true;
}
for (auto &Base : RD->bases())
  if (hasFields(Base.getType()->getAsCXXRecordDecl()))
    return true;
return false;
5348}

5350namespace {
5351typedef SmallVector<APValue, 8> ArgVector;
5352}

5354/// EvaluateArgs - Evaluate the arguments to a function call.
5355static bool EvaluateArgs(ArrayRef<const Expr *> Args, ArgVector &ArgValues,
                       EvalInfo &Info, const FunctionDecl *Callee) {
bool Success = true;
llvm::SmallBitVector ForbiddenNullArgs;
if (Callee->hasAttr<NonNullAttr>()) {
  ForbiddenNullArgs.resize(Args.size());
  for (const auto *Attr : Callee->specific_attrs<NonNullAttr>()) {
    if (!Attr->args_size()) {
      ForbiddenNullArgs.set();
      break;
    } else
      for (auto Idx : Attr->args()) {
        unsigned ASTIdx = Idx.getASTIndex();
        if (ASTIdx >= Args.size())
          continue;
        ForbiddenNullArgs[ASTIdx] = 1;
      }
  }
}
for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end();
     I != E; ++I) {
  if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) {
    // If we're checking for a potential constant expression, evaluate all
    // initializers even if some of them fail.
    if (!Info.noteFailure())
      return false;
    Success = false;
  } else if (!ForbiddenNullArgs.empty() &&
             ForbiddenNullArgs[I - Args.begin()] &&
             ArgValues[I - Args.begin()].isNullPointer()) {
    Info.CCEDiag(*I, diag::note_non_null_attribute_failed);
    if (!Info.noteFailure())
      return false;
    Success = false;
  }
}
return Success;
5392}

5394/// Evaluate a function call.
5395static bool HandleFunctionCall(SourceLocation CallLoc,
                             const FunctionDecl *Callee, const LValue *This,
                             ArrayRef<const Expr*> Args, const Stmt *Body,
                             EvalInfo &Info, APValue &Result,
                             const LValue *ResultSlot) {
ArgVector ArgValues(Args.size());
if (!EvaluateArgs(Args, ArgValues, Info, Callee))
  return false;

if (!Info.CheckCallLimit(CallLoc))
  return false;

CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data());

// For a trivial copy or move assignment, perform an APValue copy. This is
// essential for unions, where the operations performed by the assignment
// operator cannot be represented as statements.
//
// Skip this for non-union classes with no fields; in that case, the defaulted
// copy/move does not actually read the object.
const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Callee);
if (MD && MD->isDefaulted() &&
    (MD->getParent()->isUnion() ||
     (MD->isTrivial() && hasFields(MD->getParent())))) {
  assert(This &&((This && (MD->isCopyAssignmentOperator() || MD->
isMoveAssignmentOperator())) ? static_cast<void> (0) : __assert_fail
 ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5420, __PRETTY_FUNCTION__))
         (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()))((This && (MD->isCopyAssignmentOperator() || MD->
isMoveAssignmentOperator())) ? static_cast<void> (0) : __assert_fail
 ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5420, __PRETTY_FUNCTION__));
  LValue RHS;
  RHS.setFrom(Info.Ctx, ArgValues[0]);
  APValue RHSValue;
  if (!handleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), RHS,
                                      RHSValue, MD->getParent()->isUnion()))
    return false;
  if (Info.getLangOpts().CPlusPlus2a && MD->isTrivial() &&
      !HandleUnionActiveMemberChange(Info, Args[0], *This))
    return false;
  if (!handleAssignment(Info, Args[0], *This, MD->getThisType(),
                        RHSValue))
    return false;
  This->moveInto(Result);
  return true;
} else if (MD && isLambdaCallOperator(MD)) {
  // We're in a lambda; determine the lambda capture field maps unless we're
  // just constexpr checking a lambda's call operator. constexpr checking is
  // done before the captures have been added to the closure object (unless
  // we're inferring constexpr-ness), so we don't have access to them in this
  // case. But since we don't need the captures to constexpr check, we can
  // just ignore them.
  if (!Info.checkingPotentialConstantExpression())
    MD->getParent()->getCaptureFields(Frame.LambdaCaptureFields,
                                      Frame.LambdaThisCaptureField);
}

StmtResult Ret = {Result, ResultSlot};
EvalStmtResult ESR = EvaluateStmt(Ret, Info, Body);
if (ESR == ESR_Succeeded) {
  if (Callee->getReturnType()->isVoidType())
    return true;
  Info.FFDiag(Callee->getEndLoc(), diag::note_constexpr_no_return);
}
return ESR == ESR_Returned;
5455}

5457/// Evaluate a constructor call.
5458static bool HandleConstructorCall(const Expr *E, const LValue &This,
                                APValue *ArgValues,
                                const CXXConstructorDecl *Definition,
                                EvalInfo &Info, APValue &Result) {
SourceLocation CallLoc = E->getExprLoc();
if (!Info.CheckCallLimit(CallLoc))
  return false;

const CXXRecordDecl *RD = Definition->getParent();
if (RD->getNumVBases()) {
  Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD;
  return false;
}

EvalInfo::EvaluatingConstructorRAII EvalObj(
    Info,
    ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries},
    RD->getNumBases());
CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues);

// FIXME: Creating an APValue just to hold a nonexistent return value is
// wasteful.
APValue RetVal;
StmtResult Ret = {RetVal, nullptr};

// If it's a delegating constructor, delegate.
if (Definition->isDelegatingConstructor()) {
  CXXConstructorDecl::init_const_iterator I = Definition->init_begin();
  {
    FullExpressionRAII InitScope(Info);
    if (!EvaluateInPlace(Result, Info, This, (*I)->getInit()) ||
        !InitScope.destroy())
      return false;
  }
  return EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed;
}

// For a trivial copy or move constructor, perform an APValue copy. This is
// essential for unions (or classes with anonymous union members), where the
// operations performed by the constructor cannot be represented by
// ctor-initializers.
//
// Skip this for empty non-union classes; we should not perform an
// lvalue-to-rvalue conversion on them because their copy constructor does not
// actually read them.
if (Definition->isDefaulted() && Definition->isCopyOrMoveConstructor() &&
    (Definition->getParent()->isUnion() ||
     (Definition->isTrivial() && hasFields(Definition->getParent())))) {
  LValue RHS;
  RHS.setFrom(Info.Ctx, ArgValues[0]);
  return handleLValueToRValueConversion(
      Info, E, Definition->getParamDecl(0)->getType().getNonReferenceType(),
      RHS, Result, Definition->getParent()->isUnion());
}

// Reserve space for the struct members.
if (!RD->isUnion() && !Result.hasValue())
  Result = APValue(APValue::UninitStruct(), RD->getNumBases(),
                   std::distance(RD->field_begin(), RD->field_end()));

if (RD->isInvalidDecl()) return false;
const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);

// A scope for temporaries lifetime-extended by reference members.
BlockScopeRAII LifetimeExtendedScope(Info);

bool Success = true;
unsigned BasesSeen = 0;
5526#ifndef NDEBUG
CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin();
5528#endif
CXXRecordDecl::field_iterator FieldIt = RD->field_begin();
auto SkipToField = [&](FieldDecl *FD, bool Indirect) {
  // We might be initializing the same field again if this is an indirect
  // field initialization.
  if (FieldIt == RD->field_end() ||
      FieldIt->getFieldIndex() > FD->getFieldIndex()) {
    assert(Indirect && "fields out of order?")((Indirect && "fields out of order?") ? static_cast<
void> (0) : __assert_fail ("Indirect && \"fields out of order?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5535, __PRETTY_FUNCTION__));
    return;
  }

  // Default-initialize any fields with no explicit initializer.
  for (; !declaresSameEntity(*FieldIt, FD); ++FieldIt) {
    assert(FieldIt != RD->field_end() && "missing field?")((FieldIt != RD->field_end() && "missing field?") ?
 static_cast<void> (0) : __assert_fail ("FieldIt != RD->field_end() && \"missing field?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5541, __PRETTY_FUNCTION__));
    if (!FieldIt->isUnnamedBitfield())
      Result.getStructField(FieldIt->getFieldIndex()) =
          getDefaultInitValue(FieldIt->getType());
  }
  ++FieldIt;
};
for (const auto *I : Definition->inits()) {
  LValue Subobject = This;
  LValue SubobjectParent = This;
  APValue *Value = &Result;

  // Determine the subobject to initialize.
  FieldDecl *FD = nullptr;
  if (I->isBaseInitializer()) {
    QualType BaseType(I->getBaseClass(), 0);
5557#ifndef NDEBUG
    // Non-virtual base classes are initialized in the order in the class
    // definition. We have already checked for virtual base classes.
    assert(!BaseIt->isVirtual() && "virtual base for literal type")((!BaseIt->isVirtual() && "virtual base for literal type"
) ? static_cast<void> (0) : __assert_fail ("!BaseIt->isVirtual() && \"virtual base for literal type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5560, __PRETTY_FUNCTION__));
    assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&((Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&
 "base class initializers not in expected order") ? static_cast
<void> (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5562, __PRETTY_FUNCTION__))
           "base class initializers not in expected order")((Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&
 "base class initializers not in expected order") ? static_cast
<void> (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5562, __PRETTY_FUNCTION__));
    ++BaseIt;
5564#endif
    if (!HandleLValueDirectBase(Info, I->getInit(), Subobject, RD,
                                BaseType->getAsCXXRecordDecl(), &Layout))
      return false;
    Value = &Result.getStructBase(BasesSeen++);
  } else if ((FD = I->getMember())) {
    if (!HandleLValueMember(Info, I->getInit(), Subobject, FD, &Layout))
      return false;
    if (RD->isUnion()) {
      Result = APValue(FD);
      Value = &Result.getUnionValue();
    } else {
      SkipToField(FD, false);
      Value = &Result.getStructField(FD->getFieldIndex());
    }
  } else if (IndirectFieldDecl *IFD = I->getIndirectMember()) {
    // Walk the indirect field decl's chain to find the object to initialize,
    // and make sure we've initialized every step along it.
    auto IndirectFieldChain = IFD->chain();
    for (auto *C : IndirectFieldChain) {
      FD = cast<FieldDecl>(C);
      CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent());
      // Switch the union field if it differs. This happens if we had
      // preceding zero-initialization, and we're now initializing a union
      // subobject other than the first.
      // FIXME: In this case, the values of the other subobjects are
      // specified, since zero-initialization sets all padding bits to zero.
      if (!Value->hasValue() ||
          (Value->isUnion() && Value->getUnionField() != FD)) {
        if (CD->isUnion())
          *Value = APValue(FD);
        else
          // FIXME: This immediately starts the lifetime of all members of an
          // anonymous struct. It would be preferable to strictly start member
          // lifetime in initialization order.
          *Value = getDefaultInitValue(Info.Ctx.getRecordType(CD));
      }
      // Store Subobject as its parent before updating it for the last element
      // in the chain.
      if (C == IndirectFieldChain.back())
        SubobjectParent = Subobject;
      if (!HandleLValueMember(Info, I->getInit(), Subobject, FD))
        return false;
      if (CD->isUnion())
        Value = &Value->getUnionValue();
      else {
        if (C == IndirectFieldChain.front() && !RD->isUnion())
          SkipToField(FD, true);
        Value = &Value->getStructField(FD->getFieldIndex());
      }
    }
  } else {
    llvm_unreachable("unknown base initializer kind")::llvm::llvm_unreachable_internal("unknown base initializer kind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5616);
  }

  // Need to override This for implicit field initializers as in this case
  // This refers to innermost anonymous struct/union containing initializer,
  // not to currently constructed class.
  const Expr *Init = I->getInit();
  ThisOverrideRAII ThisOverride(*Info.CurrentCall, &SubobjectParent,
                                isa<CXXDefaultInitExpr>(Init));
  FullExpressionRAII InitScope(Info);
  if (!EvaluateInPlace(*Value, Info, Subobject, Init) ||
      (FD && FD->isBitField() &&
       !truncateBitfieldValue(Info, Init, *Value, FD))) {
    // If we're checking for a potential constant expression, evaluate all
    // initializers even if some of them fail.
    if (!Info.noteFailure())
      return false;
    Success = false;
  }

  // This is the point at which the dynamic type of the object becomes this
  // class type.
  if (I->isBaseInitializer() && BasesSeen == RD->getNumBases())
    EvalObj.finishedConstructingBases();
}

// Default-initialize any remaining fields.
if (!RD->isUnion()) {
  for (; FieldIt != RD->field_end(); ++FieldIt) {
    if (!FieldIt->isUnnamedBitfield())
      Result.getStructField(FieldIt->getFieldIndex()) =
          getDefaultInitValue(FieldIt->getType());
  }
}

return Success &&
       EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed &&
       LifetimeExtendedScope.destroy();
5654}

5656static bool HandleConstructorCall(const Expr *E, const LValue &This,
                                ArrayRef<const Expr*> Args,
                                const CXXConstructorDecl *Definition,
                                EvalInfo &Info, APValue &Result) {
ArgVector ArgValues(Args.size());
if (!EvaluateArgs(Args, ArgValues, Info, Definition))
  return false;

return HandleConstructorCall(E, This, ArgValues.data(), Definition,
                             Info, Result);
5666}

5668static bool HandleDestructionImpl(EvalInfo &Info, SourceLocation CallLoc,
                                const LValue &This, APValue &Value,
                                QualType T) {
// Objects can only be destroyed while they're within their lifetimes.
// FIXME: We have no representation for whether an object of type nullptr_t
// is in its lifetime; it usually doesn't matter. Perhaps we should model it
// as indeterminate instead?
if (Value.isAbsent() && !T->isNullPtrType()) {
  APValue Printable;
  This.moveInto(Printable);
  Info.FFDiag(CallLoc, diag::note_constexpr_destroy_out_of_lifetime)
    << Printable.getAsString(Info.Ctx, Info.Ctx.getLValueReferenceType(T));
  return false;
}

// Invent an expression for location purposes.
// FIXME: We shouldn't need to do this.
OpaqueValueExpr LocE(CallLoc, Info.Ctx.IntTy, VK_RValue);

// For arrays, destroy elements right-to-left.
if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(T)) {
  uint64_t Size = CAT->getSize().getZExtValue();
  QualType ElemT = CAT->getElementType();

  LValue ElemLV = This;
  ElemLV.addArray(Info, &LocE, CAT);
  if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, Size))
    return false;

  // Ensure that we have actual array elements available to destroy; the
  // destructors might mutate the value, so we can't run them on the array
  // filler.
  if (Size && Size > Value.getArrayInitializedElts())
    expandArray(Value, Value.getArraySize() - 1);

  for (; Size != 0; --Size) {
    APValue &Elem = Value.getArrayInitializedElt(Size - 1);
    if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, -1) ||
        !HandleDestructionImpl(Info, CallLoc, ElemLV, Elem, ElemT))
      return false;
  }

  // End the lifetime of this array now.
  Value = APValue();
  return true;
}

const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
if (!RD) {
  if (T.isDestructedType()) {
    Info.FFDiag(CallLoc, diag::note_constexpr_unsupported_destruction) << T;
    return false;
  }

  Value = APValue();
  return true;
}

if (RD->getNumVBases()) {
  Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD;
  return false;
}

const CXXDestructorDecl *DD = RD->getDestructor();
if (!DD && !RD->hasTrivialDestructor()) {
  Info.FFDiag(CallLoc);
  return false;
}

if (!DD || DD->isTrivial() ||
    (RD->isAnonymousStructOrUnion() && RD->isUnion())) {
  // A trivial destructor just ends the lifetime of the object. Check for
  // this case before checking for a body, because we might not bother
  // building a body for a trivial destructor. Note that it doesn't matter
  // whether the destructor is constexpr in this case; all trivial
  // destructors are constexpr.
  //
  // If an anonymous union would be destroyed, some enclosing destructor must
  // have been explicitly defined, and the anonymous union destruction should
  // have no effect.
  Value = APValue();
  return true;
}

if (!Info.CheckCallLimit(CallLoc))
  return false;

const FunctionDecl *Definition = nullptr;
const Stmt *Body = DD->getBody(Definition);

if (!CheckConstexprFunction(Info, CallLoc, DD, Definition, Body))
  return false;

CallStackFrame Frame(Info, CallLoc, Definition, &This, nullptr);

// We're now in the period of destruction of this object.
unsigned BasesLeft = RD->getNumBases();
EvalInfo::EvaluatingDestructorRAII EvalObj(
    Info,
    ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries});
if (!EvalObj.DidInsert) {
  // C++2a [class.dtor]p19:
  //   the behavior is undefined if the destructor is invoked for an object
  //   whose lifetime has ended
  // (Note that formally the lifetime ends when the period of destruction
  // begins, even though certain uses of the object remain valid until the
  // period of destruction ends.)
  Info.FFDiag(CallLoc, diag::note_constexpr_double_destroy);
  return false;
}

// FIXME: Creating an APValue just to hold a nonexistent return value is
// wasteful.
APValue RetVal;
StmtResult Ret = {RetVal, nullptr};
if (EvaluateStmt(Ret, Info, Definition->getBody()) == ESR_Failed)
  return false;

// A union destructor does not implicitly destroy its members.
if (RD->isUnion())
  return true;

const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);

// We don't have a good way to iterate fields in reverse, so collect all the
// fields first and then walk them backwards.
SmallVector<FieldDecl*, 16> Fields(RD->field_begin(), RD->field_end());
for (const FieldDecl *FD : llvm::reverse(Fields)) {
  if (FD->isUnnamedBitfield())
    continue;

  LValue Subobject = This;
  if (!HandleLValueMember(Info, &LocE, Subobject, FD, &Layout))
    return false;

  APValue *SubobjectValue = &Value.getStructField(FD->getFieldIndex());
  if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue,
                             FD->getType()))
    return false;
}

if (BasesLeft != 0)
  EvalObj.startedDestroyingBases();

// Destroy base classes in reverse order.
for (const CXXBaseSpecifier &Base : llvm::reverse(RD->bases())) {
  --BasesLeft;

  QualType BaseType = Base.getType();
  LValue Subobject = This;
  if (!HandleLValueDirectBase(Info, &LocE, Subobject, RD,
                              BaseType->getAsCXXRecordDecl(), &Layout))
    return false;

  APValue *SubobjectValue = &Value.getStructBase(BasesLeft);
  if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue,
                             BaseType))
    return false;
}
assert(BasesLeft == 0 && "NumBases was wrong?")((BasesLeft == 0 && "NumBases was wrong?") ? static_cast
<void> (0) : __assert_fail ("BasesLeft == 0 && \"NumBases was wrong?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5827, __PRETTY_FUNCTION__));

// The period of destruction ends now. The object is gone.
Value = APValue();
return true;
5832}

5834namespace {
5835struct DestroyObjectHandler {
EvalInfo &Info;
const Expr *E;
const LValue &This;
const AccessKinds AccessKind;

typedef bool result_type;
bool failed() { return false; }
bool found(APValue &Subobj, QualType SubobjType) {
  return HandleDestructionImpl(Info, E->getExprLoc(), This, Subobj,
                               SubobjType);
}
bool found(APSInt &Value, QualType SubobjType) {
  Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem);
  return false;
}
bool found(APFloat &Value, QualType SubobjType) {
  Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem);
  return false;
}
5855};
5856}

5858/// Perform a destructor or pseudo-destructor call on the given object, which
5859/// might in general not be a complete object.
5860static bool HandleDestruction(EvalInfo &Info, const Expr *E,
                            const LValue &This, QualType ThisType) {
CompleteObject Obj = findCompleteObject(Info, E, AK_Destroy, This, ThisType);
DestroyObjectHandler Handler = {Info, E, This, AK_Destroy};
return Obj && findSubobject(Info, E, Obj, This.Designator, Handler);
5865}

5867/// Destroy and end the lifetime of the given complete object.
5868static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc,
                            APValue::LValueBase LVBase, APValue &Value,
                            QualType T) {
// If we've had an unmodeled side-effect, we can't rely on mutable state
// (such as the object we're about to destroy) being correct.
if (Info.EvalStatus.HasSideEffects)
  return false;

LValue LV;
LV.set({LVBase});
return HandleDestructionImpl(Info, Loc, LV, Value, T);
5879}

5881//===----------------------------------------------------------------------===//
5882// Generic Evaluation
5883//===----------------------------------------------------------------------===//
5884namespace {

5886class BitCastBuffer {
// FIXME: We're going to need bit-level granularity when we support
// bit-fields.
// FIXME: Its possible under the C++ standard for 'char' to not be 8 bits, but
// we don't support a host or target where that is the case. Still, we should
// use a more generic type in case we ever do.
SmallVector<Optional<unsigned char>, 32> Bytes;

static_assert(std::numeric_limits<unsigned char>::digits >= 8,
              "Need at least 8 bit unsigned char");

bool TargetIsLittleEndian;

5899public:
BitCastBuffer(CharUnits Width, bool TargetIsLittleEndian)
    : Bytes(Width.getQuantity()),
      TargetIsLittleEndian(TargetIsLittleEndian) {}

LLVM_NODISCARD[[clang::warn_unused_result]]
bool readObject(CharUnits Offset, CharUnits Width,
                SmallVectorImpl<unsigned char> &Output) const {
  for (CharUnits I = Offset, E = Offset + Width; I != E; ++I) {
    // If a byte of an integer is uninitialized, then the whole integer is
    // uninitalized.
    if (!Bytes[I.getQuantity()])
      return false;
    Output.push_back(*Bytes[I.getQuantity()]);
  }
  if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian)
    std::reverse(Output.begin(), Output.end());
  return true;
}

void writeObject(CharUnits Offset, SmallVectorImpl<unsigned char> &Input) {
  if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian)
    std::reverse(Input.begin(), Input.end());

  size_t Index = 0;
  for (unsigned char Byte : Input) {
    assert(!Bytes[Offset.getQuantity() + Index] && "overwriting a byte?")((!Bytes[Offset.getQuantity() + Index] && "overwriting a byte?"
) ? static_cast<void> (0) : __assert_fail ("!Bytes[Offset.getQuantity() + Index] && \"overwriting a byte?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5925, __PRETTY_FUNCTION__));
    Bytes[Offset.getQuantity() + Index] = Byte;
    ++Index;
  }
}

size_t size() { return Bytes.size(); }
5932};

5934/// Traverse an APValue to produce an BitCastBuffer, emulating how the current
5935/// target would represent the value at runtime.
5936class APValueToBufferConverter {
EvalInfo &Info;
BitCastBuffer Buffer;
const CastExpr *BCE;

APValueToBufferConverter(EvalInfo &Info, CharUnits ObjectWidth,
                         const CastExpr *BCE)
    : Info(Info),
      Buffer(ObjectWidth, Info.Ctx.getTargetInfo().isLittleEndian()),
      BCE(BCE) {}

bool visit(const APValue &Val, QualType Ty) {
  return visit(Val, Ty, CharUnits::fromQuantity(0));
}

// Write out Val with type Ty into Buffer starting at Offset.
bool visit(const APValue &Val, QualType Ty, CharUnits Offset) {
  assert((size_t)Offset.getQuantity() <= Buffer.size())(((size_t)Offset.getQuantity() <= Buffer.size()) ? static_cast
<void> (0) : __assert_fail ("(size_t)Offset.getQuantity() <= Buffer.size()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5953, __PRETTY_FUNCTION__));

  // As a special case, nullptr_t has an indeterminate value.
  if (Ty->isNullPtrType())
    return true;

  // Dig through Src to find the byte at SrcOffset.
  switch (Val.getKind()) {
  case APValue::Indeterminate:
  case APValue::None:
    return true;

  case APValue::Int:
    return visitInt(Val.getInt(), Ty, Offset);
  case APValue::Float:
    return visitFloat(Val.getFloat(), Ty, Offset);
  case APValue::Array:
    return visitArray(Val, Ty, Offset);
  case APValue::Struct:
    return visitRecord(Val, Ty, Offset);

  case APValue::ComplexInt:
  case APValue::ComplexFloat:
  case APValue::Vector:
  case APValue::FixedPoint:
    // FIXME: We should support these.

  case APValue::Union:
  case APValue::MemberPointer:
  case APValue::AddrLabelDiff: {
    Info.FFDiag(BCE->getBeginLoc(),
                diag::note_constexpr_bit_cast_unsupported_type)
        << Ty;
    return false;
  }

  case APValue::LValue:
    llvm_unreachable("LValue subobject in bit_cast?")::llvm::llvm_unreachable_internal("LValue subobject in bit_cast?"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5990);
  }
  llvm_unreachable("Unhandled APValue::ValueKind")::llvm::llvm_unreachable_internal("Unhandled APValue::ValueKind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 5992);
}

bool visitRecord(const APValue &Val, QualType Ty, CharUnits Offset) {
  const RecordDecl *RD = Ty->getAsRecordDecl();
  const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);

  // Visit the base classes.
  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
    for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) {
      const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I];
      CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl();

      if (!visitRecord(Val.getStructBase(I), BS.getType(),
                       Layout.getBaseClassOffset(BaseDecl) + Offset))
        return false;
    }
  }

  // Visit the fields.
  unsigned FieldIdx = 0;
  for (FieldDecl *FD : RD->fields()) {
    if (FD->isBitField()) {
      Info.FFDiag(BCE->getBeginLoc(),
                  diag::note_constexpr_bit_cast_unsupported_bitfield);
      return false;
    }

    uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx);

    assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0 &&((FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && "only bit-fields can have sub-char alignment"
) ? static_cast<void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6023, __PRETTY_FUNCTION__))
           "only bit-fields can have sub-char alignment")((FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && "only bit-fields can have sub-char alignment"
) ? static_cast<void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6023, __PRETTY_FUNCTION__));
    CharUnits FieldOffset =
        Info.Ctx.toCharUnitsFromBits(FieldOffsetBits) + Offset;
    QualType FieldTy = FD->getType();
    if (!visit(Val.getStructField(FieldIdx), FieldTy, FieldOffset))
      return false;
    ++FieldIdx;
  }

  return true;
}

bool visitArray(const APValue &Val, QualType Ty, CharUnits Offset) {
  const auto *CAT =
      dyn_cast_or_null<ConstantArrayType>(Ty->getAsArrayTypeUnsafe());
  if (!CAT)
    return false;

  CharUnits ElemWidth = Info.Ctx.getTypeSizeInChars(CAT->getElementType());
  unsigned NumInitializedElts = Val.getArrayInitializedElts();
  unsigned ArraySize = Val.getArraySize();
  // First, initialize the initialized elements.
  for (unsigned I = 0; I != NumInitializedElts; ++I) {
    const APValue &SubObj = Val.getArrayInitializedElt(I);
    if (!visit(SubObj, CAT->getElementType(), Offset + I * ElemWidth))
      return false;
  }

  // Next, initialize the rest of the array using the filler.
  if (Val.hasArrayFiller()) {
    const APValue &Filler = Val.getArrayFiller();
    for (unsigned I = NumInitializedElts; I != ArraySize; ++I) {
      if (!visit(Filler, CAT->getElementType(), Offset + I * ElemWidth))
        return false;
    }
  }

  return true;
}

bool visitInt(const APSInt &Val, QualType Ty, CharUnits Offset) {
  CharUnits Width = Info.Ctx.getTypeSizeInChars(Ty);
  SmallVector<unsigned char, 8> Bytes(Width.getQuantity());
  llvm::StoreIntToMemory(Val, &*Bytes.begin(), Width.getQuantity());
  Buffer.writeObject(Offset, Bytes);
  return true;
}

bool visitFloat(const APFloat &Val, QualType Ty, CharUnits Offset) {
  APSInt AsInt(Val.bitcastToAPInt());
  return visitInt(AsInt, Ty, Offset);
}

6076public:
static Optional<BitCastBuffer> convert(EvalInfo &Info, const APValue &Src,
                                       const CastExpr *BCE) {
  CharUnits DstSize = Info.Ctx.getTypeSizeInChars(BCE->getType());
  APValueToBufferConverter Converter(Info, DstSize, BCE);
  if (!Converter.visit(Src, BCE->getSubExpr()->getType()))
    return None;
  return Converter.Buffer;
}
6085};

6087/// Write an BitCastBuffer into an APValue.
6088class BufferToAPValueConverter {
EvalInfo &Info;
const BitCastBuffer &Buffer;
const CastExpr *BCE;

BufferToAPValueConverter(EvalInfo &Info, const BitCastBuffer &Buffer,
                         const CastExpr *BCE)
    : Info(Info), Buffer(Buffer), BCE(BCE) {}

// Emit an unsupported bit_cast type error. Sema refuses to build a bit_cast
// with an invalid type, so anything left is a deficiency on our part (FIXME).
// Ideally this will be unreachable.
llvm::NoneType unsupportedType(QualType Ty) {
  Info.FFDiag(BCE->getBeginLoc(),
              diag::note_constexpr_bit_cast_unsupported_type)
      << Ty;
  return None;
}

Optional<APValue> visit(const BuiltinType *T, CharUnits Offset,
                        const EnumType *EnumSugar = nullptr) {
  if (T->isNullPtrType()) {
    uint64_t NullValue = Info.Ctx.getTargetNullPointerValue(QualType(T, 0));
    return APValue((Expr *)nullptr,
                   /*Offset=*/CharUnits::fromQuantity(NullValue),
                   APValue::NoLValuePath{}, /*IsNullPtr=*/true);
  }

  CharUnits SizeOf = Info.Ctx.getTypeSizeInChars(T);
  SmallVector<uint8_t, 8> Bytes;
  if (!Buffer.readObject(Offset, SizeOf, Bytes)) {
    // If this is std::byte or unsigned char, then its okay to store an
    // indeterminate value.
    bool IsStdByte = EnumSugar && EnumSugar->isStdByteType();
    bool IsUChar =
        !EnumSugar && (T->isSpecificBuiltinType(BuiltinType::UChar) ||
                       T->isSpecificBuiltinType(BuiltinType::Char_U));
    if (!IsStdByte && !IsUChar) {
      QualType DisplayType(EnumSugar ? (const Type *)EnumSugar : T, 0);
      Info.FFDiag(BCE->getExprLoc(),
                  diag::note_constexpr_bit_cast_indet_dest)
          << DisplayType << Info.Ctx.getLangOpts().CharIsSigned;
      return None;
    }

    return APValue::IndeterminateValue();
  }

  APSInt Val(SizeOf.getQuantity() * Info.Ctx.getCharWidth(), true);
  llvm::LoadIntFromMemory(Val, &*Bytes.begin(), Bytes.size());

  if (T->isIntegralOrEnumerationType()) {
    Val.setIsSigned(T->isSignedIntegerOrEnumerationType());
    return APValue(Val);
  }

  if (T->isRealFloatingType()) {
    const llvm::fltSemantics &Semantics =
        Info.Ctx.getFloatTypeSemantics(QualType(T, 0));
    return APValue(APFloat(Semantics, Val));
  }

  return unsupportedType(QualType(T, 0));
}

Optional<APValue> visit(const RecordType *RTy, CharUnits Offset) {
  const RecordDecl *RD = RTy->getAsRecordDecl();
  const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);

  unsigned NumBases = 0;
  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
    NumBases = CXXRD->getNumBases();

  APValue ResultVal(APValue::UninitStruct(), NumBases,
                    std::distance(RD->field_begin(), RD->field_end()));

  // Visit the base classes.
  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
    for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) {
      const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I];
      CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl();
      if (BaseDecl->isEmpty() ||
          Info.Ctx.getASTRecordLayout(BaseDecl).getNonVirtualSize().isZero())
        continue;

      Optional<APValue> SubObj = visitType(
          BS.getType(), Layout.getBaseClassOffset(BaseDecl) + Offset);
      if (!SubObj)
        return None;
      ResultVal.getStructBase(I) = *SubObj;
    }
  }

  // Visit the fields.
  unsigned FieldIdx = 0;
  for (FieldDecl *FD : RD->fields()) {
    // FIXME: We don't currently support bit-fields. A lot of the logic for
    // this is in CodeGen, so we need to factor it around.
    if (FD->isBitField()) {
      Info.FFDiag(BCE->getBeginLoc(),
                  diag::note_constexpr_bit_cast_unsupported_bitfield);
      return None;
    }

    uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx);
    assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0)((FieldOffsetBits % Info.Ctx.getCharWidth() == 0) ? static_cast
<void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6193, __PRETTY_FUNCTION__));

    CharUnits FieldOffset =
        CharUnits::fromQuantity(FieldOffsetBits / Info.Ctx.getCharWidth()) +
        Offset;
    QualType FieldTy = FD->getType();
    Optional<APValue> SubObj = visitType(FieldTy, FieldOffset);
    if (!SubObj)
      return None;
    ResultVal.getStructField(FieldIdx) = *SubObj;
    ++FieldIdx;
  }

  return ResultVal;
}

Optional<APValue> visit(const EnumType *Ty, CharUnits Offset) {
  QualType RepresentationType = Ty->getDecl()->getIntegerType();
  assert(!RepresentationType.isNull() &&((!RepresentationType.isNull() && "enum forward decl should be caught by Sema"
) ? static_cast<void> (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6212, __PRETTY_FUNCTION__))
         "enum forward decl should be caught by Sema")((!RepresentationType.isNull() && "enum forward decl should be caught by Sema"
) ? static_cast<void> (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6212, __PRETTY_FUNCTION__));
  const BuiltinType *AsBuiltin =
      RepresentationType.getCanonicalType()->getAs<BuiltinType>();
  assert(AsBuiltin && "non-integral enum underlying type?")((AsBuiltin && "non-integral enum underlying type?") ?
 static_cast<void> (0) : __assert_fail ("AsBuiltin && \"non-integral enum underlying type?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6215, __PRETTY_FUNCTION__));
  // Recurse into the underlying type. Treat std::byte transparently as
  // unsigned char.
  return visit(AsBuiltin, Offset, /*EnumTy=*/Ty);
}

Optional<APValue> visit(const ConstantArrayType *Ty, CharUnits Offset) {
  size_t Size = Ty->getSize().getLimitedValue();
  CharUnits ElementWidth = Info.Ctx.getTypeSizeInChars(Ty->getElementType());

  APValue ArrayValue(APValue::UninitArray(), Size, Size);
  for (size_t I = 0; I != Size; ++I) {
    Optional<APValue> ElementValue =
        visitType(Ty->getElementType(), Offset + I * ElementWidth);
    if (!ElementValue)
      return None;
    ArrayValue.getArrayInitializedElt(I) = std::move(*ElementValue);
  }

  return ArrayValue;
}

Optional<APValue> visit(const Type *Ty, CharUnits Offset) {
  return unsupportedType(QualType(Ty, 0));
}

Optional<APValue> visitType(QualType Ty, CharUnits Offset) {
  QualType Can = Ty.getCanonicalType();

  switch (Can->getTypeClass()) {
6245#define TYPE(Class, Base)                                                      \
case Type::Class:                                                            \
  return visit(cast<Class##Type>(Can.getTypePtr()), Offset);
6248#define ABSTRACT_TYPE(Class, Base)
6249#define NON_CANONICAL_TYPE(Class, Base)                                        \
case Type::Class:                                                            \
  llvm_unreachable("non-canonical type should be impossible!")::llvm::llvm_unreachable_internal("non-canonical type should be impossible!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6251);
6252#define DEPENDENT_TYPE(Class, Base)                                            \
case Type::Class:                                                            \
  llvm_unreachable(                                                          \::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6255)
      "dependent types aren't supported in the constant evaluator!")::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6255);
6256#define NON_CANONICAL_UNLESS_DEPENDENT(Class, Base)case Type::Class: ::llvm::llvm_unreachable_internal("either dependent or not canonical!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6256);                            \
case Type::Class:                                                            \
  llvm_unreachable("either dependent or not canonical!")::llvm::llvm_unreachable_internal("either dependent or not canonical!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6258);
6259#include "clang/AST/TypeNodes.inc"
  }
  llvm_unreachable("Unhandled Type::TypeClass")::llvm::llvm_unreachable_internal("Unhandled Type::TypeClass"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6261);
}

6264public:
// Pull out a full value of type DstType.
static Optional<APValue> convert(EvalInfo &Info, BitCastBuffer &Buffer,
                                 const CastExpr *BCE) {
  BufferToAPValueConverter Converter(Info, Buffer, BCE);
  return Converter.visitType(BCE->getType(), CharUnits::fromQuantity(0));
}
6271};

6273static bool checkBitCastConstexprEligibilityType(SourceLocation Loc,
                                               QualType Ty, EvalInfo *Info,
                                               const ASTContext &Ctx,
                                               bool CheckingDest) {
Ty = Ty.getCanonicalType();

auto diag = [&](int Reason) {
  if (Info)
    Info->FFDiag(Loc, diag::note_constexpr_bit_cast_invalid_type)
        << CheckingDest << (Reason == 4) << Reason;
  return false;
};
auto note = [&](int Construct, QualType NoteTy, SourceLocation NoteLoc) {
  if (Info)
    Info->Note(NoteLoc, diag::note_constexpr_bit_cast_invalid_subtype)
        << NoteTy << Construct << Ty;
  return false;
};

if (Ty->isUnionType())
  return diag(0);
if (Ty->isPointerType())
  return diag(1);
if (Ty->isMemberPointerType())
  return diag(2);
if (Ty.isVolatileQualified())
  return diag(3);

if (RecordDecl *Record = Ty->getAsRecordDecl()) {
  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(Record)) {
    for (CXXBaseSpecifier &BS : CXXRD->bases())
      if (!checkBitCastConstexprEligibilityType(Loc, BS.getType(), Info, Ctx,
                                                CheckingDest))
        return note(1, BS.getType(), BS.getBeginLoc());
  }
  for (FieldDecl *FD : Record->fields()) {
    if (FD->getType()->isReferenceType())
      return diag(4);
    if (!checkBitCastConstexprEligibilityType(Loc, FD->getType(), Info, Ctx,
                                              CheckingDest))
      return note(0, FD->getType(), FD->getBeginLoc());
  }
}

if (Ty->isArrayType() &&
    !checkBitCastConstexprEligibilityType(Loc, Ctx.getBaseElementType(Ty),
                                          Info, Ctx, CheckingDest))
  return false;

return true;
6323}

6325static bool checkBitCastConstexprEligibility(EvalInfo *Info,
                                           const ASTContext &Ctx,
                                           const CastExpr *BCE) {
bool DestOK = checkBitCastConstexprEligibilityType(
    BCE->getBeginLoc(), BCE->getType(), Info, Ctx, true);
bool SourceOK = DestOK && checkBitCastConstexprEligibilityType(
                              BCE->getBeginLoc(),
                              BCE->getSubExpr()->getType(), Info, Ctx, false);
return SourceOK;
6334}

6336static bool handleLValueToRValueBitCast(EvalInfo &Info, APValue &DestValue,
                                      APValue &SourceValue,
                                      const CastExpr *BCE) {
assert(CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 &&((8 == 8 && Info.Ctx.getTargetInfo().getCharWidth() ==
&& "no host or target supports non 8-bit chars") ?
 static_cast<void> (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6340, __PRETTY_FUNCTION__))
       "no host or target supports non 8-bit chars")((8 == 8 && Info.Ctx.getTargetInfo().getCharWidth() ==
&& "no host or target supports non 8-bit chars") ?
 static_cast<void> (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6340, __PRETTY_FUNCTION__));
assert(SourceValue.isLValue() &&((SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!"
) ? static_cast<void> (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6342, __PRETTY_FUNCTION__))
       "LValueToRValueBitcast requires an lvalue operand!")((SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!"
) ? static_cast<void> (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6342, __PRETTY_FUNCTION__));

if (!checkBitCastConstexprEligibility(&Info, Info.Ctx, BCE))
  return false;

LValue SourceLValue;
APValue SourceRValue;
SourceLValue.setFrom(Info.Ctx, SourceValue);
if (!handleLValueToRValueConversion(
        Info, BCE, BCE->getSubExpr()->getType().withConst(), SourceLValue,
        SourceRValue, /*WantObjectRepresentation=*/true))
  return false;

// Read out SourceValue into a char buffer.
Optional<BitCastBuffer> Buffer =
    APValueToBufferConverter::convert(Info, SourceRValue, BCE);
if (!Buffer)
  return false;

// Write out the buffer into a new APValue.
Optional<APValue> MaybeDestValue =
    BufferToAPValueConverter::convert(Info, *Buffer, BCE);
if (!MaybeDestValue)
  return false;

DestValue = std::move(*MaybeDestValue);
return true;
6369}

6371template <class Derived>
6372class ExprEvaluatorBase
: public ConstStmtVisitor<Derived, bool> {
6374private:
Derived &getDerived() { return static_cast<Derived&>(*this); }
bool DerivedSuccess(const APValue &V, const Expr *E) {
  return getDerived().Success(V, E);
}
bool DerivedZeroInitialization(const Expr *E) {
  return getDerived().ZeroInitialization(E);
}

// Check whether a conditional operator with a non-constant condition is a
// potential constant expression. If neither arm is a potential constant
// expression, then the conditional operator is not either.
template<typename ConditionalOperator>
void CheckPotentialConstantConditional(const ConditionalOperator *E) {
  assert(Info.checkingPotentialConstantExpression())((Info.checkingPotentialConstantExpression()) ? static_cast<
void> (0) : __assert_fail ("Info.checkingPotentialConstantExpression()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6388, __PRETTY_FUNCTION__));

  // Speculatively evaluate both arms.
  SmallVector<PartialDiagnosticAt, 8> Diag;
  {
    SpeculativeEvaluationRAII Speculate(Info, &Diag);
    StmtVisitorTy::Visit(E->getFalseExpr());
    if (Diag.empty())
      return;
  }

  {
    SpeculativeEvaluationRAII Speculate(Info, &Diag);
    Diag.clear();
    StmtVisitorTy::Visit(E->getTrueExpr());
    if (Diag.empty())
      return;
  }

  Error(E, diag::note_constexpr_conditional_never_const);
}


template<typename ConditionalOperator>
bool HandleConditionalOperator(const ConditionalOperator *E) {
  bool BoolResult;
  if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) {
    if (Info.checkingPotentialConstantExpression() && Info.noteFailure()) {
      CheckPotentialConstantConditional(E);
      return false;
    }
    if (Info.noteFailure()) {
      StmtVisitorTy::Visit(E->getTrueExpr());
      StmtVisitorTy::Visit(E->getFalseExpr());
    }
    return false;
  }

  Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr();
  return StmtVisitorTy::Visit(EvalExpr);
}

6430protected:
EvalInfo &Info;
typedef ConstStmtVisitor<Derived, bool> StmtVisitorTy;
typedef ExprEvaluatorBase ExprEvaluatorBaseTy;

OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) {
  return Info.CCEDiag(E, D);
}

bool ZeroInitialization(const Expr *E) { return Error(E); }

6441public:
ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {}

EvalInfo &getEvalInfo() { return Info; }

/// Report an evaluation error. This should only be called when an error is
/// first discovered. When propagating an error, just return false.
bool Error(const Expr *E, diag::kind D) {
  Info.FFDiag(E, D);
  return false;
}
bool Error(const Expr *E) {
  return Error(E, diag::note_invalid_subexpr_in_const_expr);
}

bool VisitStmt(const Stmt *) {
  llvm_unreachable("Expression evaluator should not be called on stmts")::llvm::llvm_unreachable_internal("Expression evaluator should not be called on stmts"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6457);
}
bool VisitExpr(const Expr *E) {
  return Error(E);
}

bool VisitConstantExpr(const ConstantExpr *E)
  { return StmtVisitorTy::Visit(E->getSubExpr()); }
bool VisitParenExpr(const ParenExpr *E)
  { return StmtVisitorTy::Visit(E->getSubExpr()); }
bool VisitUnaryExtension(const UnaryOperator *E)
  { return StmtVisitorTy::Visit(E->getSubExpr()); }
bool VisitUnaryPlus(const UnaryOperator *E)
  { return StmtVisitorTy::Visit(E->getSubExpr()); }
bool VisitChooseExpr(const ChooseExpr *E)
  { return StmtVisitorTy::Visit(E->getChosenSubExpr()); }
bool VisitGenericSelectionExpr(const GenericSelectionExpr *E)
  { return StmtVisitorTy::Visit(E->getResultExpr()); }
bool VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E)
  { return StmtVisitorTy::Visit(E->getReplacement()); }
bool VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) {
  TempVersionRAII RAII(*Info.CurrentCall);
  SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope);
  return StmtVisitorTy::Visit(E->getExpr());
}
bool VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *E) {
  TempVersionRAII RAII(*Info.CurrentCall);
  // The initializer may not have been parsed yet, or might be erroneous.
  if (!E->getExpr())
    return Error(E);
  SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope);
  return StmtVisitorTy::Visit(E->getExpr());
}

bool VisitExprWithCleanups(const ExprWithCleanups *E) {
  FullExpressionRAII Scope(Info);
  return StmtVisitorTy::Visit(E->getSubExpr()) && Scope.destroy();
}

// Temporaries are registered when created, so we don't care about
// CXXBindTemporaryExpr.
bool VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
  return StmtVisitorTy::Visit(E->getSubExpr());
}

bool VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) {
  CCEDiag(E, diag::note_constexpr_invalid_cast) << 0;
  return static_cast<Derived*>(this)->VisitCastExpr(E);
}
bool VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) {
  if (!Info.Ctx.getLangOpts().CPlusPlus2a)
    CCEDiag(E, diag::note_constexpr_invalid_cast) << 1;
  return static_cast<Derived*>(this)->VisitCastExpr(E);
}
bool VisitBuiltinBitCastExpr(const BuiltinBitCastExpr *E) {
  return static_cast<Derived*>(this)->VisitCastExpr(E);
}

bool VisitBinaryOperator(const BinaryOperator *E) {
  switch (E->getOpcode()) {
  default:
    return Error(E);

  case BO_Comma:
    VisitIgnoredValue(E->getLHS());
    return StmtVisitorTy::Visit(E->getRHS());

  case BO_PtrMemD:
  case BO_PtrMemI: {
    LValue Obj;
    if (!HandleMemberPointerAccess(Info, E, Obj))
      return false;
    APValue Result;
    if (!handleLValueToRValueConversion(Info, E, E->getType(), Obj, Result))
      return false;
    return DerivedSuccess(Result, E);
  }
  }
}

bool VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) {
  // Evaluate and cache the common expression. We treat it as a temporary,
  // even though it's not quite the same thing.
  LValue CommonLV;
  if (!Evaluate(Info.CurrentCall->createTemporary(
                    E->getOpaqueValue(),
                    getStorageType(Info.Ctx, E->getOpaqueValue()), false,
                    CommonLV),
                Info, E->getCommon()))
    return false;

  return HandleConditionalOperator(E);
}

bool VisitConditionalOperator(const ConditionalOperator *E) {
  bool IsBcpCall = false;
  // If the condition (ignoring parens) is a __builtin_constant_p call,
  // the result is a constant expression if it can be folded without
  // side-effects. This is an important GNU extension. See GCC PR38377
  // for discussion.
  if (const CallExpr *CallCE =
        dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts()))
    if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p)
      IsBcpCall = true;

  // Always assume __builtin_constant_p(...) ? ... : ... is a potential
  // constant expression; we can't check whether it's potentially foldable.
  // FIXME: We should instead treat __builtin_constant_p as non-constant if
  // it would return 'false' in this mode.
  if (Info.checkingPotentialConstantExpression() && IsBcpCall)
    return false;

  FoldConstant Fold(Info, IsBcpCall);
  if (!HandleConditionalOperator(E)) {
    Fold.keepDiagnostics();
    return false;
  }

  return true;
}

bool VisitOpaqueValueExpr(const OpaqueValueExpr *E) {
  if (APValue *Value = Info.CurrentCall->getCurrentTemporary(E))
    return DerivedSuccess(*Value, E);

  const Expr *Source = E->getSourceExpr();
  if (!Source)
    return Error(E);
  if (Source == E) { // sanity checking.
    assert(0 && "OpaqueValueExpr recursively refers to itself")((0 && "OpaqueValueExpr recursively refers to itself"
) ? static_cast<void> (0) : __assert_fail ("0 && \"OpaqueValueExpr recursively refers to itself\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6586, __PRETTY_FUNCTION__));
    return Error(E);
  }
  return StmtVisitorTy::Visit(Source);
}

bool VisitCallExpr(const CallExpr *E) {
  APValue Result;
  if (!handleCallExpr(E, Result, nullptr))
    return false;
  return DerivedSuccess(Result, E);
}

bool handleCallExpr(const CallExpr *E, APValue &Result,
                   const LValue *ResultSlot) {
  const Expr *Callee = E->getCallee()->IgnoreParens();
  QualType CalleeType = Callee->getType();

  const FunctionDecl *FD = nullptr;
  LValue *This = nullptr, ThisVal;
  auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs());
  bool HasQualifier = false;

  // Extract function decl and 'this' pointer from the callee.
  if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) {
    const CXXMethodDecl *Member = nullptr;
    if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) {
      // Explicit bound member calls, such as x.f() or p->g();
      if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal))
        return false;
      Member = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
      if (!Member)
        return Error(Callee);
      This = &ThisVal;
      HasQualifier = ME->hasQualifier();
    } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) {
      // Indirect bound member calls ('.*' or '->*').
      Member = dyn_cast_or_null<CXXMethodDecl>(
          HandleMemberPointerAccess(Info, BE, ThisVal, false));
      if (!Member)
        return Error(Callee);
      This = &ThisVal;
    } else if (const auto *PDE = dyn_cast<CXXPseudoDestructorExpr>(Callee)) {
      if (!Info.getLangOpts().CPlusPlus2a)
        Info.CCEDiag(PDE, diag::note_constexpr_pseudo_destructor);
      // FIXME: If pseudo-destructor calls ever start ending the lifetime of
      // their callee, we should start calling HandleDestruction here.
      // For now, we just evaluate the object argument and discard it.
      return EvaluateObjectArgument(Info, PDE->getBase(), ThisVal);
    } else
      return Error(Callee);
    FD = Member;
  } else if (CalleeType->isFunctionPointerType()) {
    LValue Call;
    if (!EvaluatePointer(Callee, Call, Info))
      return false;

    if (!Call.getLValueOffset().isZero())
      return Error(Callee);
    FD = dyn_cast_or_null<FunctionDecl>(
                           Call.getLValueBase().dyn_cast<const ValueDecl*>());
    if (!FD)
      return Error(Callee);
    // Don't call function pointers which have been cast to some other type.
    // Per DR (no number yet), the caller and callee can differ in noexcept.
    if (!Info.Ctx.hasSameFunctionTypeIgnoringExceptionSpec(
      CalleeType->getPointeeType(), FD->getType())) {
      return Error(E);
    }

    // Overloaded operator calls to member functions are represented as normal
    // calls with '*this' as the first argument.
    const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
    if (MD && !MD->isStatic()) {
      // FIXME: When selecting an implicit conversion for an overloaded
      // operator delete, we sometimes try to evaluate calls to conversion
      // operators without a 'this' parameter!
      if (Args.empty())
        return Error(E);

      if (!EvaluateObjectArgument(Info, Args[0], ThisVal))
        return false;
      This = &ThisVal;
      Args = Args.slice(1);
    } else if (MD && MD->isLambdaStaticInvoker()) {
      // Map the static invoker for the lambda back to the call operator.
      // Conveniently, we don't have to slice out the 'this' argument (as is
      // being done for the non-static case), since a static member function
      // doesn't have an implicit argument passed in.
      const CXXRecordDecl *ClosureClass = MD->getParent();
      assert(((ClosureClass->captures_begin() == ClosureClass->captures_end
() && "Number of captures must be zero for conversion to function-ptr"
) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6678, __PRETTY_FUNCTION__))
          ClosureClass->captures_begin() == ClosureClass->captures_end() &&((ClosureClass->captures_begin() == ClosureClass->captures_end
() && "Number of captures must be zero for conversion to function-ptr"
) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6678, __PRETTY_FUNCTION__))
          "Number of captures must be zero for conversion to function-ptr")((ClosureClass->captures_begin() == ClosureClass->captures_end
() && "Number of captures must be zero for conversion to function-ptr"
) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6678, __PRETTY_FUNCTION__));

      const CXXMethodDecl *LambdaCallOp =
          ClosureClass->getLambdaCallOperator();

      // Set 'FD', the function that will be called below, to the call
      // operator.  If the closure object represents a generic lambda, find
      // the corresponding specialization of the call operator.

      if (ClosureClass->isGenericLambda()) {
        assert(MD->isFunctionTemplateSpecialization() &&((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a "
 "template specialization") ? static_cast<void> (0) : __assert_fail
 ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6690, __PRETTY_FUNCTION__))
               "A generic lambda's static-invoker function must be a "((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a "
 "template specialization") ? static_cast<void> (0) : __assert_fail
 ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6690, __PRETTY_FUNCTION__))
               "template specialization")((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a "
 "template specialization") ? static_cast<void> (0) : __assert_fail
 ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6690, __PRETTY_FUNCTION__));
        const TemplateArgumentList *TAL = MD->getTemplateSpecializationArgs();
        FunctionTemplateDecl *CallOpTemplate =
            LambdaCallOp->getDescribedFunctionTemplate();
        void *InsertPos = nullptr;
        FunctionDecl *CorrespondingCallOpSpecialization =
            CallOpTemplate->findSpecialization(TAL->asArray(), InsertPos);
        assert(CorrespondingCallOpSpecialization &&((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization "
 "that corresponds to our static invoker specialization") ? static_cast
<void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6699, __PRETTY_FUNCTION__))
               "We must always have a function call operator specialization "((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization "
 "that corresponds to our static invoker specialization") ? static_cast
<void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6699, __PRETTY_FUNCTION__))
               "that corresponds to our static invoker specialization")((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization "
 "that corresponds to our static invoker specialization") ? static_cast
<void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6699, __PRETTY_FUNCTION__));
        FD = cast<CXXMethodDecl>(CorrespondingCallOpSpecialization);
      } else
        FD = LambdaCallOp;
    }
  } else
    return Error(E);

  SmallVector<QualType, 4> CovariantAdjustmentPath;
  if (This) {
    auto *NamedMember = dyn_cast<CXXMethodDecl>(FD);
    if (NamedMember && NamedMember->isVirtual() && !HasQualifier) {
      // Perform virtual dispatch, if necessary.
      FD = HandleVirtualDispatch(Info, E, *This, NamedMember,
                                 CovariantAdjustmentPath);
      if (!FD)
        return false;
    } else {
      // Check that the 'this' pointer points to an object of the right type.
      // FIXME: If this is an assignment operator call, we may need to change
      // the active union member before we check this.
      if (!checkNonVirtualMemberCallThisPointer(Info, E, *This, NamedMember))
        return false;
    }
  }

  // Destructor calls are different enough that they have their own codepath.
  if (auto *DD = dyn_cast<CXXDestructorDecl>(FD)) {
    assert(This && "no 'this' pointer for destructor call")((This && "no 'this' pointer for destructor call") ? static_cast
<void> (0) : __assert_fail ("This && \"no 'this' pointer for destructor call\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6727, __PRETTY_FUNCTION__));
    return HandleDestruction(Info, E, *This,
                             Info.Ctx.getRecordType(DD->getParent()));
  }

  const FunctionDecl *Definition = nullptr;
  Stmt *Body = FD->getBody(Definition);

  if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body) ||
      !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, Info,
                          Result, ResultSlot))
    return false;

  if (!CovariantAdjustmentPath.empty() &&
      !HandleCovariantReturnAdjustment(Info, E, Result,
                                       CovariantAdjustmentPath))
    return false;

  return true;
}

bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) {
  return StmtVisitorTy::Visit(E->getInitializer());
}
bool VisitInitListExpr(const InitListExpr *E) {
  if (E->getNumInits() == 0)
    return DerivedZeroInitialization(E);
  if (E->getNumInits() == 1)
    return StmtVisitorTy::Visit(E->getInit(0));
  return Error(E);
}
bool VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
  return DerivedZeroInitialization(E);
}
bool VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
  return DerivedZeroInitialization(E);
}
bool VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
  return DerivedZeroInitialization(E);
}

/// A member expression where the object is a prvalue is itself a prvalue.
bool VisitMemberExpr(const MemberExpr *E) {
  assert(!Info.Ctx.getLangOpts().CPlusPlus11 &&((!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion"
) ? static_cast<void> (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6771, __PRETTY_FUNCTION__))
         "missing temporary materialization conversion")((!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion"
) ? static_cast<void> (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6771, __PRETTY_FUNCTION__));
  assert(!E->isArrow() && "missing call to bound member function?")((!E->isArrow() && "missing call to bound member function?"
) ? static_cast<void> (0) : __assert_fail ("!E->isArrow() && \"missing call to bound member function?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6772, __PRETTY_FUNCTION__));

  APValue Val;
  if (!Evaluate(Val, Info, E->getBase()))
    return false;

  QualType BaseTy = E->getBase()->getType();

  const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl());
  if (!FD) return Error(E);
  assert(!FD->getType()->isReferenceType() && "prvalue reference?")((!FD->getType()->isReferenceType() && "prvalue reference?"
) ? static_cast<void> (0) : __assert_fail ("!FD->getType()->isReferenceType() && \"prvalue reference?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6782, __PRETTY_FUNCTION__));
  assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() ==((BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl
() == FD->getParent()->getCanonicalDecl() && "record / field mismatch"
) ? static_cast<void> (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6784, __PRETTY_FUNCTION__))
         FD->getParent()->getCanonicalDecl() && "record / field mismatch")((BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl
() == FD->getParent()->getCanonicalDecl() && "record / field mismatch"
) ? static_cast<void> (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6784, __PRETTY_FUNCTION__));

  // Note: there is no lvalue base here. But this case should only ever
  // happen in C or in C++98, where we cannot be evaluating a constexpr
  // constructor, which is the only case the base matters.
  CompleteObject Obj(APValue::LValueBase(), &Val, BaseTy);
  SubobjectDesignator Designator(BaseTy);
  Designator.addDeclUnchecked(FD);

  APValue Result;
  return extractSubobject(Info, E, Obj, Designator, Result) &&
         DerivedSuccess(Result, E);
}

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    break;

  case CK_AtomicToNonAtomic: {
    APValue AtomicVal;
    // This does not need to be done in place even for class/array types:
    // atomic-to-non-atomic conversion implies copying the object
    // representation.
    if (!Evaluate(AtomicVal, Info, E->getSubExpr()))
      return false;
    return DerivedSuccess(AtomicVal, E);
  }

  case CK_NoOp:
  case CK_UserDefinedConversion:
    return StmtVisitorTy::Visit(E->getSubExpr());

  case CK_LValueToRValue: {
    LValue LVal;
    if (!EvaluateLValue(E->getSubExpr(), LVal, Info))
      return false;
    APValue RVal;
    // Note, we use the subexpression's type in order to retain cv-qualifiers.
    if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(),
                                        LVal, RVal))
      return false;
    return DerivedSuccess(RVal, E);
  }
  case CK_LValueToRValueBitCast: {
    APValue DestValue, SourceValue;
    if (!Evaluate(SourceValue, Info, E->getSubExpr()))
      return false;
    if (!handleLValueToRValueBitCast(Info, DestValue, SourceValue, E))
      return false;
    return DerivedSuccess(DestValue, E);
  }
  }

  return Error(E);
}

bool VisitUnaryPostInc(const UnaryOperator *UO) {
  return VisitUnaryPostIncDec(UO);
}
bool VisitUnaryPostDec(const UnaryOperator *UO) {
  return VisitUnaryPostIncDec(UO);
}
bool VisitUnaryPostIncDec(const UnaryOperator *UO) {
  if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure())
    return Error(UO);

  LValue LVal;
  if (!EvaluateLValue(UO->getSubExpr(), LVal, Info))
    return false;
  APValue RVal;
  if (!handleIncDec(this->Info, UO, LVal, UO->getSubExpr()->getType(),
                    UO->isIncrementOp(), &RVal))
    return false;
  return DerivedSuccess(RVal, UO);
}

bool VisitStmtExpr(const StmtExpr *E) {
  // We will have checked the full-expressions inside the statement expression
  // when they were completed, and don't need to check them again now.
  if (Info.checkingForUndefinedBehavior())
    return Error(E);

  const CompoundStmt *CS = E->getSubStmt();
  if (CS->body_empty())
    return true;

  BlockScopeRAII Scope(Info);
  for (CompoundStmt::const_body_iterator BI = CS->body_begin(),
                                         BE = CS->body_end();
       /**/; ++BI) {
    if (BI + 1 == BE) {
      const Expr *FinalExpr = dyn_cast<Expr>(*BI);
      if (!FinalExpr) {
        Info.FFDiag((*BI)->getBeginLoc(),
                    diag::note_constexpr_stmt_expr_unsupported);
        return false;
      }
      return this->Visit(FinalExpr) && Scope.destroy();
    }

    APValue ReturnValue;
    StmtResult Result = { ReturnValue, nullptr };
    EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI);
    if (ESR != ESR_Succeeded) {
      // FIXME: If the statement-expression terminated due to 'return',
      // 'break', or 'continue', it would be nice to propagate that to
      // the outer statement evaluation rather than bailing out.
      if (ESR != ESR_Failed)
        Info.FFDiag((*BI)->getBeginLoc(),
                    diag::note_constexpr_stmt_expr_unsupported);
      return false;
    }
  }

  llvm_unreachable("Return from function from the loop above.")::llvm::llvm_unreachable_internal("Return from function from the loop above."
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6899);
}

/// Visit a value which is evaluated, but whose value is ignored.
void VisitIgnoredValue(const Expr *E) {
  EvaluateIgnoredValue(Info, E);
}

/// Potentially visit a MemberExpr's base expression.
void VisitIgnoredBaseExpression(const Expr *E) {
  // While MSVC doesn't evaluate the base expression, it does diagnose the
  // presence of side-effecting behavior.
  if (Info.getLangOpts().MSVCCompat && !E->HasSideEffects(Info.Ctx))
    return;
  VisitIgnoredValue(E);
}
6915};

6917} // namespace

6919//===----------------------------------------------------------------------===//
6920// Common base class for lvalue and temporary evaluation.
6921//===----------------------------------------------------------------------===//
6922namespace {
6923template<class Derived>
6924class LValueExprEvaluatorBase
: public ExprEvaluatorBase<Derived> {
6926protected:
LValue &Result;
bool InvalidBaseOK;
typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy;
typedef ExprEvaluatorBase<Derived> ExprEvaluatorBaseTy;

bool Success(APValue::LValueBase B) {
  Result.set(B);
  return true;
}

bool evaluatePointer(const Expr *E, LValue &Result) {
  return EvaluatePointer(E, Result, this->Info, InvalidBaseOK);
}

6941public:
LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result, bool InvalidBaseOK)
    : ExprEvaluatorBaseTy(Info), Result(Result),
      InvalidBaseOK(InvalidBaseOK) {}

bool Success(const APValue &V, const Expr *E) {
  Result.setFrom(this->Info.Ctx, V);
  return true;
}

bool VisitMemberExpr(const MemberExpr *E) {
  // Handle non-static data members.
  QualType BaseTy;
  bool EvalOK;
  if (E->isArrow()) {
    EvalOK = evaluatePointer(E->getBase(), Result);
    BaseTy = E->getBase()->getType()->castAs<PointerType>()->getPointeeType();
  } else if (E->getBase()->isRValue()) {
    assert(E->getBase()->getType()->isRecordType())((E->getBase()->getType()->isRecordType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isRecordType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6959, __PRETTY_FUNCTION__));
    EvalOK = EvaluateTemporary(E->getBase(), Result, this->Info);
    BaseTy = E->getBase()->getType();
  } else {
    EvalOK = this->Visit(E->getBase());
    BaseTy = E->getBase()->getType();
  }
  if (!EvalOK) {
    if (!InvalidBaseOK)
      return false;
    Result.setInvalid(E);
    return true;
  }

  const ValueDecl *MD = E->getMemberDecl();
  if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) {
    assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() ==((BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl
() == FD->getParent()->getCanonicalDecl() && "record / field mismatch"
) ? static_cast<void> (0) : __assert_fail ("BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6976, __PRETTY_FUNCTION__))
           FD->getParent()->getCanonicalDecl() && "record / field mismatch")((BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl
() == FD->getParent()->getCanonicalDecl() && "record / field mismatch"
) ? static_cast<void> (0) : __assert_fail ("BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 6976, __PRETTY_FUNCTION__));
    (void)BaseTy;
    if (!HandleLValueMember(this->Info, E, Result, FD))
      return false;
  } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) {
    if (!HandleLValueIndirectMember(this->Info, E, Result, IFD))
      return false;
  } else
    return this->Error(E);

  if (MD->getType()->isReferenceType()) {
    APValue RefValue;
    if (!handleLValueToRValueConversion(this->Info, E, MD->getType(), Result,
                                        RefValue))
      return false;
    return Success(RefValue, E);
  }
  return true;
}

bool VisitBinaryOperator(const BinaryOperator *E) {
  switch (E->getOpcode()) {
  default:
    return ExprEvaluatorBaseTy::VisitBinaryOperator(E);

  case BO_PtrMemD:
  case BO_PtrMemI:
    return HandleMemberPointerAccess(this->Info, E, Result);
  }
}

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    return ExprEvaluatorBaseTy::VisitCastExpr(E);

  case CK_DerivedToBase:
  case CK_UncheckedDerivedToBase:
    if (!this->Visit(E->getSubExpr()))
      return false;

    // Now figure out the necessary offset to add to the base LV to get from
    // the derived class to the base class.
    return HandleLValueBasePath(this->Info, E, E->getSubExpr()->getType(),
                                Result);
  }
}
7023};
7024}

7026//===----------------------------------------------------------------------===//
7027// LValue Evaluation
7028//
7029// This is used for evaluating lvalues (in C and C++), xvalues (in C++11),
7030// function designators (in C), decl references to void objects (in C), and
7031// temporaries (if building with -Wno-address-of-temporary).
7032//
7033// LValue evaluation produces values comprising a base expression of one of the
7034// following types:
7035// - Declarations
7036//  * VarDecl
7037//  * FunctionDecl
7038// - Literals
7039//  * CompoundLiteralExpr in C (and in global scope in C++)
7040//  * StringLiteral
7041//  * PredefinedExpr
7042//  * ObjCStringLiteralExpr
7043//  * ObjCEncodeExpr
7044//  * AddrLabelExpr
7045//  * BlockExpr
7046//  * CallExpr for a MakeStringConstant builtin
7047// - typeid(T) expressions, as TypeInfoLValues
7048// - Locals and temporaries
7049//  * MaterializeTemporaryExpr
7050//  * Any Expr, with a CallIndex indicating the function in which the temporary
7051//    was evaluated, for cases where the MaterializeTemporaryExpr is missing
7052//    from the AST (FIXME).
7053//  * A MaterializeTemporaryExpr that has static storage duration, with no
7054//    CallIndex, for a lifetime-extended temporary.
7055// plus an offset in bytes.
7056//===----------------------------------------------------------------------===//
7057namespace {
7058class LValueExprEvaluator
: public LValueExprEvaluatorBase<LValueExprEvaluator> {
7060public:
LValueExprEvaluator(EvalInfo &Info, LValue &Result, bool InvalidBaseOK) :
  LValueExprEvaluatorBaseTy(Info, Result, InvalidBaseOK) {}

bool VisitVarDecl(const Expr *E, const VarDecl *VD);
bool VisitUnaryPreIncDec(const UnaryOperator *UO);

bool VisitDeclRefExpr(const DeclRefExpr *E);
bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); }
bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E);
bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E);
bool VisitMemberExpr(const MemberExpr *E);
bool VisitStringLiteral(const StringLiteral *E) { return Success(E); }
bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); }
bool VisitCXXTypeidExpr(const CXXTypeidExpr *E);
bool VisitCXXUuidofExpr(const CXXUuidofExpr *E);
bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E);
bool VisitUnaryDeref(const UnaryOperator *E);
bool VisitUnaryReal(const UnaryOperator *E);
bool VisitUnaryImag(const UnaryOperator *E);
bool VisitUnaryPreInc(const UnaryOperator *UO) {
  return VisitUnaryPreIncDec(UO);
}
bool VisitUnaryPreDec(const UnaryOperator *UO) {
  return VisitUnaryPreIncDec(UO);
}
bool VisitBinAssign(const BinaryOperator *BO);
bool VisitCompoundAssignOperator(const CompoundAssignOperator *CAO);

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    return LValueExprEvaluatorBaseTy::VisitCastExpr(E);

  case CK_LValueBitCast:
    this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2;
    if (!Visit(E->getSubExpr()))
      return false;
    Result.Designator.setInvalid();
    return true;

  case CK_BaseToDerived:
    if (!Visit(E->getSubExpr()))
      return false;
    return HandleBaseToDerivedCast(Info, E, Result);

  case CK_Dynamic:
    if (!Visit(E->getSubExpr()))
      return false;
    return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result);
  }
}
7112};
7113} // end anonymous namespace

7115/// Evaluate an expression as an lvalue. This can be legitimately called on
7116/// expressions which are not glvalues, in three cases:
7117///  * function designators in C, and
7118///  * "extern void" objects
7119///  * @selector() expressions in Objective-C
7120static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info,
                         bool InvalidBaseOK) {
assert(E->isGLValue() || E->getType()->isFunctionType() ||((E->isGLValue() || E->getType()->isFunctionType() ||
 E->getType()->isVoidType() || isa<ObjCSelectorExpr>
(E)) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7123, __PRETTY_FUNCTION__))
       E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E))((E->isGLValue() || E->getType()->isFunctionType() ||
 E->getType()->isVoidType() || isa<ObjCSelectorExpr>
(E)) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7123, __PRETTY_FUNCTION__));
return LValueExprEvaluator(Info, Result, InvalidBaseOK).Visit(E);
7125}

7127bool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl()))
  return Success(FD);
if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
  return VisitVarDecl(E, VD);
if (const BindingDecl *BD = dyn_cast<BindingDecl>(E->getDecl()))
  return Visit(BD->getBinding());
return Error(E);
7135}


7138bool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) {

// If we are within a lambda's call operator, check whether the 'VD' referred
// to within 'E' actually represents a lambda-capture that maps to a
// data-member/field within the closure object, and if so, evaluate to the
// field or what the field refers to.
if (Info.CurrentCall && isLambdaCallOperator(Info.CurrentCall->Callee) &&
    isa<DeclRefExpr>(E) &&
    cast<DeclRefExpr>(E)->refersToEnclosingVariableOrCapture()) {
  // We don't always have a complete capture-map when checking or inferring if
  // the function call operator meets the requirements of a constexpr function
  // - but we don't need to evaluate the captures to determine constexprness
  // (dcl.constexpr C++17).
  if (Info.checkingPotentialConstantExpression())
    return false;

  if (auto *FD = Info.CurrentCall->LambdaCaptureFields.lookup(VD)) {
    // Start with 'Result' referring to the complete closure object...
    Result = *Info.CurrentCall->This;
    // ... then update it to refer to the field of the closure object
    // that represents the capture.
    if (!HandleLValueMember(Info, E, Result, FD))
      return false;
    // And if the field is of reference type, update 'Result' to refer to what
    // the field refers to.
    if (FD->getType()->isReferenceType()) {
      APValue RVal;
      if (!handleLValueToRValueConversion(Info, E, FD->getType(), Result,
                                          RVal))
        return false;
      Result.setFrom(Info.Ctx, RVal);
    }
    return true;
  }
}
CallStackFrame *Frame = nullptr;
if (VD->hasLocalStorage() && Info.CurrentCall->Index > 1) {
  // Only if a local variable was declared in the function currently being
  // evaluated, do we expect to be able to find its value in the current
  // frame. (Otherwise it was likely declared in an enclosing context and
  // could either have a valid evaluatable value (for e.g. a constexpr
  // variable) or be ill-formed (and trigger an appropriate evaluation
  // diagnostic)).
  if (Info.CurrentCall->Callee &&
      Info.CurrentCall->Callee->Equals(VD->getDeclContext())) {
    Frame = Info.CurrentCall;
  }
}

if (!VD->getType()->isReferenceType()) {
  if (Frame) {
    Result.set({VD, Frame->Index,
                Info.CurrentCall->getCurrentTemporaryVersion(VD)});
    return true;
  }
  return Success(VD);
}

APValue *V;
if (!evaluateVarDeclInit(Info, E, VD, Frame, V, nullptr))
  return false;
if (!V->hasValue()) {
  // FIXME: Is it possible for V to be indeterminate here? If so, we should
  // adjust the diagnostic to say that.
  if (!Info.checkingPotentialConstantExpression())
    Info.FFDiag(E, diag::note_constexpr_use_uninit_reference);
  return false;
}
return Success(*V, E);
7207}

7209bool LValueExprEvaluator::VisitMaterializeTemporaryExpr(
  const MaterializeTemporaryExpr *E) {
// Walk through the expression to find the materialized temporary itself.
SmallVector<const Expr *, 2> CommaLHSs;
SmallVector<SubobjectAdjustment, 2> Adjustments;
const Expr *Inner = E->GetTemporaryExpr()->
    skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);

// If we passed any comma operators, evaluate their LHSs.
for (unsigned I = 0, N = CommaLHSs.size(); I != N; ++I)
  if (!EvaluateIgnoredValue(Info, CommaLHSs[I]))
    return false;

// A materialized temporary with static storage duration can appear within the
// result of a constant expression evaluation, so we need to preserve its
// value for use outside this evaluation.
APValue *Value;
if (E->getStorageDuration() == SD_Static) {
  Value = Info.Ctx.getMaterializedTemporaryValue(E, true);
  *Value = APValue();
  Result.set(E);
} else {
  Value = &Info.CurrentCall->createTemporary(
      E, E->getType(), E->getStorageDuration() == SD_Automatic, Result);
}

QualType Type = Inner->getType();

// Materialize the temporary itself.
if (!EvaluateInPlace(*Value, Info, Result, Inner)) {
  *Value = APValue();
  return false;
}

// Adjust our lvalue to refer to the desired subobject.
for (unsigned I = Adjustments.size(); I != 0; /**/) {
  --I;
  switch (Adjustments[I].Kind) {
  case SubobjectAdjustment::DerivedToBaseAdjustment:
    if (!HandleLValueBasePath(Info, Adjustments[I].DerivedToBase.BasePath,
                              Type, Result))
      return false;
    Type = Adjustments[I].DerivedToBase.BasePath->getType();
    break;

  case SubobjectAdjustment::FieldAdjustment:
    if (!HandleLValueMember(Info, E, Result, Adjustments[I].Field))
      return false;
    Type = Adjustments[I].Field->getType();
    break;

  case SubobjectAdjustment::MemberPointerAdjustment:
    if (!HandleMemberPointerAccess(this->Info, Type, Result,
                                   Adjustments[I].Ptr.RHS))
      return false;
    Type = Adjustments[I].Ptr.MPT->getPointeeType();
    break;
  }
}

return true;
7270}

7272bool
7273LValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) {
assert((!Info.getLangOpts().CPlusPlus || E->isFileScope()) &&(((!Info.getLangOpts().CPlusPlus || E->isFileScope()) &&
 "lvalue compound literal in c++?") ? static_cast<void>
 (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7275, __PRETTY_FUNCTION__))
       "lvalue compound literal in c++?")(((!Info.getLangOpts().CPlusPlus || E->isFileScope()) &&
 "lvalue compound literal in c++?") ? static_cast<void>
 (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7275, __PRETTY_FUNCTION__));
// Defer visiting the literal until the lvalue-to-rvalue conversion. We can
// only see this when folding in C, so there's no standard to follow here.
return Success(E);
7279}

7281bool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) {
TypeInfoLValue TypeInfo;

if (!E->isPotentiallyEvaluated()) {
  if (E->isTypeOperand())
    TypeInfo = TypeInfoLValue(E->getTypeOperand(Info.Ctx).getTypePtr());
  else
    TypeInfo = TypeInfoLValue(E->getExprOperand()->getType().getTypePtr());
} else {
  if (!Info.Ctx.getLangOpts().CPlusPlus2a) {
    Info.CCEDiag(E, diag::note_constexpr_typeid_polymorphic)
      << E->getExprOperand()->getType()
      << E->getExprOperand()->getSourceRange();
  }

  if (!Visit(E->getExprOperand()))
    return false;

  Optional<DynamicType> DynType =
      ComputeDynamicType(Info, E, Result, AK_TypeId);
  if (!DynType)
    return false;

  TypeInfo =
      TypeInfoLValue(Info.Ctx.getRecordType(DynType->Type).getTypePtr());
}

return Success(APValue::LValueBase::getTypeInfo(TypeInfo, E->getType()));
7309}

7311bool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) {
return Success(E);
7313}

7315bool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) {
// Handle static data members.
if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) {
  VisitIgnoredBaseExpression(E->getBase());
  return VisitVarDecl(E, VD);
}

// Handle static member functions.
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) {
  if (MD->isStatic()) {
    VisitIgnoredBaseExpression(E->getBase());
    return Success(MD);
  }
}

// Handle non-static data members.
return LValueExprEvaluatorBaseTy::VisitMemberExpr(E);
7332}

7334bool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) {
// FIXME: Deal with vectors as array subscript bases.
if (E->getBase()->getType()->isVectorType())
  return Error(E);

bool Success = true;
if (!evaluatePointer(E->getBase(), Result)) {
  if (!Info.noteFailure())
    return false;
  Success = false;
}

APSInt Index;
if (!EvaluateInteger(E->getIdx(), Index, Info))
  return false;

return Success &&
       HandleLValueArrayAdjustment(Info, E, Result, E->getType(), Index);
7352}

7354bool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) {
return evaluatePointer(E->getSubExpr(), Result);
7356}

7358bool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) {
if (!Visit(E->getSubExpr()))
  return false;
// __real is a no-op on scalar lvalues.
if (E->getSubExpr()->getType()->isAnyComplexType())
  HandleLValueComplexElement(Info, E, Result, E->getType(), false);
return true;
7365}

7367bool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
assert(E->getSubExpr()->getType()->isAnyComplexType() &&((E->getSubExpr()->getType()->isAnyComplexType() &&
 "lvalue __imag__ on scalar?") ? static_cast<void> (0) :
 __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7369, __PRETTY_FUNCTION__))
       "lvalue __imag__ on scalar?")((E->getSubExpr()->getType()->isAnyComplexType() &&
 "lvalue __imag__ on scalar?") ? static_cast<void> (0) :
 __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7369, __PRETTY_FUNCTION__));
if (!Visit(E->getSubExpr()))
  return false;
HandleLValueComplexElement(Info, E, Result, E->getType(), true);
return true;
7374}

7376bool LValueExprEvaluator::VisitUnaryPreIncDec(const UnaryOperator *UO) {
if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure())
  return Error(UO);

if (!this->Visit(UO->getSubExpr()))
  return false;

return handleIncDec(
    this->Info, UO, Result, UO->getSubExpr()->getType(),
    UO->isIncrementOp(), nullptr);
7386}

7388bool LValueExprEvaluator::VisitCompoundAssignOperator(
  const CompoundAssignOperator *CAO) {
if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure())
  return Error(CAO);

APValue RHS;

// The overall lvalue result is the result of evaluating the LHS.
if (!this->Visit(CAO->getLHS())) {
  if (Info.noteFailure())
    Evaluate(RHS, this->Info, CAO->getRHS());
  return false;
}

if (!Evaluate(RHS, this->Info, CAO->getRHS()))
  return false;

return handleCompoundAssignment(
    this->Info, CAO,
    Result, CAO->getLHS()->getType(), CAO->getComputationLHSType(),
    CAO->getOpForCompoundAssignment(CAO->getOpcode()), RHS);
7409}

7411bool LValueExprEvaluator::VisitBinAssign(const BinaryOperator *E) {
if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure())
  return Error(E);

APValue NewVal;

if (!this->Visit(E->getLHS())) {
  if (Info.noteFailure())
    Evaluate(NewVal, this->Info, E->getRHS());
  return false;
}

if (!Evaluate(NewVal, this->Info, E->getRHS()))
  return false;

if (Info.getLangOpts().CPlusPlus2a &&
    !HandleUnionActiveMemberChange(Info, E->getLHS(), Result))
  return false;

return handleAssignment(this->Info, E, Result, E->getLHS()->getType(),
                        NewVal);
7432}

7434//===----------------------------------------------------------------------===//
7435// Pointer Evaluation
7436//===----------------------------------------------------------------------===//

7438/// Attempts to compute the number of bytes available at the pointer
7439/// returned by a function with the alloc_size attribute. Returns true if we
7440/// were successful. Places an unsigned number into `Result`.
7441///
7442/// This expects the given CallExpr to be a call to a function with an
7443/// alloc_size attribute.
7444static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx,
                                          const CallExpr *Call,
                                          llvm::APInt &Result) {
const AllocSizeAttr *AllocSize = getAllocSizeAttr(Call);

assert(AllocSize && AllocSize->getElemSizeParam().isValid())((AllocSize && AllocSize->getElemSizeParam().isValid
()) ? static_cast<void> (0) : __assert_fail ("AllocSize && AllocSize->getElemSizeParam().isValid()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7449, __PRETTY_FUNCTION__));
unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex();
unsigned BitsInSizeT = Ctx.getTypeSize(Ctx.getSizeType());
if (Call->getNumArgs() <= SizeArgNo)
  return false;

auto EvaluateAsSizeT = [&](const Expr *E, APSInt &Into) {
  Expr::EvalResult ExprResult;
  if (!E->EvaluateAsInt(ExprResult, Ctx, Expr::SE_AllowSideEffects))
    return false;
  Into = ExprResult.Val.getInt();
  if (Into.isNegative() || !Into.isIntN(BitsInSizeT))
    return false;
  Into = Into.zextOrSelf(BitsInSizeT);
  return true;
};

APSInt SizeOfElem;
if (!EvaluateAsSizeT(Call->getArg(SizeArgNo), SizeOfElem))
  return false;

if (!AllocSize->getNumElemsParam().isValid()) {
  Result = std::move(SizeOfElem);
  return true;
}

APSInt NumberOfElems;
unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex();
if (!EvaluateAsSizeT(Call->getArg(NumArgNo), NumberOfElems))
  return false;

bool Overflow;
llvm::APInt BytesAvailable = SizeOfElem.umul_ov(NumberOfElems, Overflow);
if (Overflow)
  return false;

Result = std::move(BytesAvailable);
return true;
7487}

7489/// Convenience function. LVal's base must be a call to an alloc_size
7490/// function.
7491static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx,
                                          const LValue &LVal,
                                          llvm::APInt &Result) {
assert(isBaseAnAllocSizeCall(LVal.getLValueBase()) &&((isBaseAnAllocSizeCall(LVal.getLValueBase()) && "Can't get the size of a non alloc_size function"
) ? static_cast<void> (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7495, __PRETTY_FUNCTION__))
       "Can't get the size of a non alloc_size function")((isBaseAnAllocSizeCall(LVal.getLValueBase()) && "Can't get the size of a non alloc_size function"
) ? static_cast<void> (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7495, __PRETTY_FUNCTION__));
const auto *Base = LVal.getLValueBase().get<const Expr *>();
const CallExpr *CE = tryUnwrapAllocSizeCall(Base);
return getBytesReturnedByAllocSizeCall(Ctx, CE, Result);
7499}

7501/// Attempts to evaluate the given LValueBase as the result of a call to
7502/// a function with the alloc_size attribute. If it was possible to do so, this
7503/// function will return true, make Result's Base point to said function call,
7504/// and mark Result's Base as invalid.
7505static bool evaluateLValueAsAllocSize(EvalInfo &Info, APValue::LValueBase Base,
                                    LValue &Result) {
if (Base.isNull())
  return false;

// Because we do no form of static analysis, we only support const variables.
//
// Additionally, we can't support parameters, nor can we support static
// variables (in the latter case, use-before-assign isn't UB; in the former,
// we have no clue what they'll be assigned to).
const auto *VD =
    dyn_cast_or_null<VarDecl>(Base.dyn_cast<const ValueDecl *>());
if (!VD || !VD->isLocalVarDecl() || !VD->getType().isConstQualified())
  return false;

const Expr *Init = VD->getAnyInitializer();
if (!Init)
  return false;

const Expr *E = Init->IgnoreParens();
if (!tryUnwrapAllocSizeCall(E))
  return false;

// Store E instead of E unwrapped so that the type of the LValue's base is
// what the user wanted.
Result.setInvalid(E);

QualType Pointee = E->getType()->castAs<PointerType>()->getPointeeType();
Result.addUnsizedArray(Info, E, Pointee);
return true;
7535}

7537namespace {
7538class PointerExprEvaluator
: public ExprEvaluatorBase<PointerExprEvaluator> {
LValue &Result;
bool InvalidBaseOK;

bool Success(const Expr *E) {
  Result.set(E);
  return true;
}

bool evaluateLValue(const Expr *E, LValue &Result) {
  return EvaluateLValue(E, Result, Info, InvalidBaseOK);
}

bool evaluatePointer(const Expr *E, LValue &Result) {
  return EvaluatePointer(E, Result, Info, InvalidBaseOK);
}

bool visitNonBuiltinCallExpr(const CallExpr *E);
7557public:

PointerExprEvaluator(EvalInfo &info, LValue &Result, bool InvalidBaseOK)
    : ExprEvaluatorBaseTy(info), Result(Result),
      InvalidBaseOK(InvalidBaseOK) {}

bool Success(const APValue &V, const Expr *E) {
  Result.setFrom(Info.Ctx, V);
  return true;
}
bool ZeroInitialization(const Expr *E) {
  auto TargetVal = Info.Ctx.getTargetNullPointerValue(E->getType());
  Result.setNull(E->getType(), TargetVal);
  return true;
}

bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitCastExpr(const CastExpr* E);
bool VisitUnaryAddrOf(const UnaryOperator *E);
bool VisitObjCStringLiteral(const ObjCStringLiteral *E)
    { return Success(E); }
bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) {
  if (E->isExpressibleAsConstantInitializer())
    return Success(E);
  if (Info.noteFailure())
    EvaluateIgnoredValue(Info, E->getSubExpr());
  return Error(E);
}
bool VisitAddrLabelExpr(const AddrLabelExpr *E)
    { return Success(E); }
bool VisitCallExpr(const CallExpr *E);
bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp);
bool VisitBlockExpr(const BlockExpr *E) {
  if (!E->getBlockDecl()->hasCaptures())
    return Success(E);
  return Error(E);
}
bool VisitCXXThisExpr(const CXXThisExpr *E) {
  // Can't look at 'this' when checking a potential constant expression.
  if (Info.checkingPotentialConstantExpression())
    return false;
  if (!Info.CurrentCall->This) {
    if (Info.getLangOpts().CPlusPlus11)
      Info.FFDiag(E, diag::note_constexpr_this) << E->isImplicit();
    else
      Info.FFDiag(E);
    return false;
  }
  Result = *Info.CurrentCall->This;
  // If we are inside a lambda's call operator, the 'this' expression refers
  // to the enclosing '*this' object (either by value or reference) which is
  // either copied into the closure object's field that represents the '*this'
  // or refers to '*this'.
  if (isLambdaCallOperator(Info.CurrentCall->Callee)) {
    // Update 'Result' to refer to the data member/field of the closure object
    // that represents the '*this' capture.
    if (!HandleLValueMember(Info, E, Result,
                           Info.CurrentCall->LambdaThisCaptureField))
      return false;
    // If we captured '*this' by reference, replace the field with its referent.
    if (Info.CurrentCall->LambdaThisCaptureField->getType()
            ->isPointerType()) {
      APValue RVal;
      if (!handleLValueToRValueConversion(Info, E, E->getType(), Result,
                                          RVal))
        return false;

      Result.setFrom(Info.Ctx, RVal);
    }
  }
  return true;
}

bool VisitCXXNewExpr(const CXXNewExpr *E);

bool VisitSourceLocExpr(const SourceLocExpr *E) {
  assert(E->isStringType() && "SourceLocExpr isn't a pointer type?")((E->isStringType() && "SourceLocExpr isn't a pointer type?"
) ? static_cast<void> (0) : __assert_fail ("E->isStringType() && \"SourceLocExpr isn't a pointer type?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7633, __PRETTY_FUNCTION__));
  APValue LValResult = E->EvaluateInContext(
      Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr());
  Result.setFrom(Info.Ctx, LValResult);
  return true;
}

// FIXME: Missing: @protocol, @selector
7641};
7642} // end anonymous namespace

7644static bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info,
                          bool InvalidBaseOK) {
assert(E->isRValue() && E->getType()->hasPointerRepresentation())((E->isRValue() && E->getType()->hasPointerRepresentation
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->hasPointerRepresentation()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7646, __PRETTY_FUNCTION__));
26
←
'?' condition is true→
31
←
'?' condition is true→
return PointerExprEvaluator(Info, Result, InvalidBaseOK).Visit(E);
27
←
Returning value, which participates in a condition later→
32
←
Returning value, which participates in a condition later→
7648}

7650bool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
if (E->getOpcode() != BO_Add &&
    E->getOpcode() != BO_Sub)
  return ExprEvaluatorBaseTy::VisitBinaryOperator(E);

const Expr *PExp = E->getLHS();
const Expr *IExp = E->getRHS();
if (IExp->getType()->isPointerType())
  std::swap(PExp, IExp);

bool EvalPtrOK = evaluatePointer(PExp, Result);
if (!EvalPtrOK && !Info.noteFailure())
  return false;

llvm::APSInt Offset;
if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK)
  return false;

if (E->getOpcode() == BO_Sub)
  negateAsSigned(Offset);

QualType Pointee = PExp->getType()->castAs<PointerType>()->getPointeeType();
return HandleLValueArrayAdjustment(Info, E, Result, Pointee, Offset);
7673}

7675bool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) {
return evaluateLValue(E->getSubExpr(), Result);
7677}

7679bool PointerExprEvaluator::VisitCastExpr(const CastExpr *E) {
const Expr *SubExpr = E->getSubExpr();

switch (E->getCastKind()) {
default:
  break;
case CK_BitCast:
case CK_CPointerToObjCPointerCast:
case CK_BlockPointerToObjCPointerCast:
case CK_AnyPointerToBlockPointerCast:
case CK_AddressSpaceConversion:
  if (!Visit(SubExpr))
    return false;
  // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are
  // permitted in constant expressions in C++11. Bitcasts from cv void* are
  // also static_casts, but we disallow them as a resolution to DR1312.
  if (!E->getType()->isVoidPointerType()) {
    Result.Designator.setInvalid();
    if (SubExpr->getType()->isVoidPointerType())
      CCEDiag(E, diag::note_constexpr_invalid_cast)
        << 3 << SubExpr->getType();
    else
      CCEDiag(E, diag::note_constexpr_invalid_cast) << 2;
  }
  if (E->getCastKind() == CK_AddressSpaceConversion && Result.IsNullPtr)
    ZeroInitialization(E);
  return true;

case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
  if (!evaluatePointer(E->getSubExpr(), Result))
    return false;
  if (!Result.Base && Result.Offset.isZero())
    return true;

  // Now figure out the necessary offset to add to the base LV to get from
  // the derived class to the base class.
  return HandleLValueBasePath(Info, E, E->getSubExpr()->getType()->
                                castAs<PointerType>()->getPointeeType(),
                              Result);

case CK_BaseToDerived:
  if (!Visit(E->getSubExpr()))
    return false;
  if (!Result.Base && Result.Offset.isZero())
    return true;
  return HandleBaseToDerivedCast(Info, E, Result);

case CK_Dynamic:
  if (!Visit(E->getSubExpr()))
    return false;
  return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result);

case CK_NullToPointer:
  VisitIgnoredValue(E->getSubExpr());
  return ZeroInitialization(E);

case CK_IntegralToPointer: {
  CCEDiag(E, diag::note_constexpr_invalid_cast) << 2;

  APValue Value;
  if (!EvaluateIntegerOrLValue(SubExpr, Value, Info))
    break;

  if (Value.isInt()) {
    unsigned Size = Info.Ctx.getTypeSize(E->getType());
    uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue();
    Result.Base = (Expr*)nullptr;
    Result.InvalidBase = false;
    Result.Offset = CharUnits::fromQuantity(N);
    Result.Designator.setInvalid();
    Result.IsNullPtr = false;
    return true;
  } else {
    // Cast is of an lvalue, no need to change value.
    Result.setFrom(Info.Ctx, Value);
    return true;
  }
}

case CK_ArrayToPointerDecay: {
  if (SubExpr->isGLValue()) {
    if (!evaluateLValue(SubExpr, Result))
      return false;
  } else {
    APValue &Value = Info.CurrentCall->createTemporary(
        SubExpr, SubExpr->getType(), false, Result);
    if (!EvaluateInPlace(Value, Info, Result, SubExpr))
      return false;
  }
  // The result is a pointer to the first element of the array.
  auto *AT = Info.Ctx.getAsArrayType(SubExpr->getType());
  if (auto *CAT = dyn_cast<ConstantArrayType>(AT))
    Result.addArray(Info, E, CAT);
  else
    Result.addUnsizedArray(Info, E, AT->getElementType());
  return true;
}

case CK_FunctionToPointerDecay:
  return evaluateLValue(SubExpr, Result);

case CK_LValueToRValue: {
  LValue LVal;
  if (!evaluateLValue(E->getSubExpr(), LVal))
    return false;

  APValue RVal;
  // Note, we use the subexpression's type in order to retain cv-qualifiers.
  if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(),
                                      LVal, RVal))
    return InvalidBaseOK &&
           evaluateLValueAsAllocSize(Info, LVal.Base, Result);
  return Success(RVal, E);
}
}

return ExprEvaluatorBaseTy::VisitCastExpr(E);
7797}

7799static CharUnits GetAlignOfType(EvalInfo &Info, QualType T,
                              UnaryExprOrTypeTrait ExprKind) {
// C++ [expr.alignof]p3:
//     When alignof is applied to a reference type, the result is the
//     alignment of the referenced type.
if (const ReferenceType *Ref = T->getAs<ReferenceType>())
  T = Ref->getPointeeType();

if (T.getQualifiers().hasUnaligned())
  return CharUnits::One();

const bool AlignOfReturnsPreferred =
    Info.Ctx.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver7;

// __alignof is defined to return the preferred alignment.
// Before 8, clang returned the preferred alignment for alignof and _Alignof
// as well.
if (ExprKind == UETT_PreferredAlignOf || AlignOfReturnsPreferred)
  return Info.Ctx.toCharUnitsFromBits(
    Info.Ctx.getPreferredTypeAlign(T.getTypePtr()));
// alignof and _Alignof are defined to return the ABI alignment.
else if (ExprKind == UETT_AlignOf)
  return Info.Ctx.getTypeAlignInChars(T.getTypePtr());
else
  llvm_unreachable("GetAlignOfType on a non-alignment ExprKind")::llvm::llvm_unreachable_internal("GetAlignOfType on a non-alignment ExprKind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7823);
7824}

7826static CharUnits GetAlignOfExpr(EvalInfo &Info, const Expr *E,
                              UnaryExprOrTypeTrait ExprKind) {
E = E->IgnoreParens();

// The kinds of expressions that we have special-case logic here for
// should be kept up to date with the special checks for those
// expressions in Sema.

// alignof decl is always accepted, even if it doesn't make sense: we default
// to 1 in those cases.
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
  return Info.Ctx.getDeclAlign(DRE->getDecl(),
                               /*RefAsPointee*/true);

if (const MemberExpr *ME = dyn_cast<MemberExpr>(E))
  return Info.Ctx.getDeclAlign(ME->getMemberDecl(),
                               /*RefAsPointee*/true);

return GetAlignOfType(Info, E->getType(), ExprKind);
7845}

7847// To be clear: this happily visits unsupported builtins. Better name welcomed.
7848bool PointerExprEvaluator::visitNonBuiltinCallExpr(const CallExpr *E) {
if (ExprEvaluatorBaseTy::VisitCallExpr(E))
  return true;

if (!(InvalidBaseOK && getAllocSizeAttr(E)))
  return false;

Result.setInvalid(E);
QualType PointeeTy = E->getType()->castAs<PointerType>()->getPointeeType();
Result.addUnsizedArray(Info, E, PointeeTy);
return true;
7859}

7861bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (IsStringLiteralCall(E))
  return Success(E);

if (unsigned BuiltinOp = E->getBuiltinCallee())
  return VisitBuiltinCallExpr(E, BuiltinOp);

return visitNonBuiltinCallExpr(E);
7869}

7871bool PointerExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
                                              unsigned BuiltinOp) {
switch (BuiltinOp) {
case Builtin::BI__builtin_addressof:
  return evaluateLValue(E->getArg(0), Result);
case Builtin::BI__builtin_assume_aligned: {
  // We need to be very careful here because: if the pointer does not have the
  // asserted alignment, then the behavior is undefined, and undefined
  // behavior is non-constant.
  if (!evaluatePointer(E->getArg(0), Result))
    return false;

  LValue OffsetResult(Result);
  APSInt Alignment;
  if (!EvaluateInteger(E->getArg(1), Alignment, Info))
    return false;
  CharUnits Align = CharUnits::fromQuantity(Alignment.getZExtValue());

  if (E->getNumArgs() > 2) {
    APSInt Offset;
    if (!EvaluateInteger(E->getArg(2), Offset, Info))
      return false;

    int64_t AdditionalOffset = -Offset.getZExtValue();
    OffsetResult.Offset += CharUnits::fromQuantity(AdditionalOffset);
  }

  // If there is a base object, then it must have the correct alignment.
  if (OffsetResult.Base) {
    CharUnits BaseAlignment;
    if (const ValueDecl *VD =
        OffsetResult.Base.dyn_cast<const ValueDecl*>()) {
      BaseAlignment = Info.Ctx.getDeclAlign(VD);
    } else if (const Expr *E = OffsetResult.Base.dyn_cast<const Expr *>()) {
      BaseAlignment = GetAlignOfExpr(Info, E, UETT_AlignOf);
    } else {
      BaseAlignment = GetAlignOfType(
          Info, OffsetResult.Base.getTypeInfoType(), UETT_AlignOf);
    }

    if (BaseAlignment < Align) {
      Result.Designator.setInvalid();
      // FIXME: Add support to Diagnostic for long / long long.
      CCEDiag(E->getArg(0),
              diag::note_constexpr_baa_insufficient_alignment) << 0
        << (unsigned)BaseAlignment.getQuantity()
        << (unsigned)Align.getQuantity();
      return false;
    }
  }

  // The offset must also have the correct alignment.
  if (OffsetResult.Offset.alignTo(Align) != OffsetResult.Offset) {
    Result.Designator.setInvalid();

    (OffsetResult.Base
         ? CCEDiag(E->getArg(0),
                   diag::note_constexpr_baa_insufficient_alignment) << 1
         : CCEDiag(E->getArg(0),
                   diag::note_constexpr_baa_value_insufficient_alignment))
      << (int)OffsetResult.Offset.getQuantity()
      << (unsigned)Align.getQuantity();
    return false;
  }

  return true;
}
case Builtin::BI__builtin_launder:
  return evaluatePointer(E->getArg(0), Result);
case Builtin::BIstrchr:
case Builtin::BIwcschr:
case Builtin::BImemchr:
case Builtin::BIwmemchr:
  if (Info.getLangOpts().CPlusPlus11)
    Info.CCEDiag(E, diag::note_constexpr_invalid_function)
      << /*isConstexpr*/0 << /*isConstructor*/0
      << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'");
  else
    Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_strchr:
case Builtin::BI__builtin_wcschr:
case Builtin::BI__builtin_memchr:
case Builtin::BI__builtin_char_memchr:
case Builtin::BI__builtin_wmemchr: {
  if (!Visit(E->getArg(0)))
    return false;
  APSInt Desired;
  if (!EvaluateInteger(E->getArg(1), Desired, Info))
    return false;
  uint64_t MaxLength = uint64_t(-1);
  if (BuiltinOp != Builtin::BIstrchr &&
      BuiltinOp != Builtin::BIwcschr &&
      BuiltinOp != Builtin::BI__builtin_strchr &&
      BuiltinOp != Builtin::BI__builtin_wcschr) {
    APSInt N;
    if (!EvaluateInteger(E->getArg(2), N, Info))
      return false;
    MaxLength = N.getExtValue();
  }
  // We cannot find the value if there are no candidates to match against.
  if (MaxLength == 0u)
    return ZeroInitialization(E);
  if (!Result.checkNullPointerForFoldAccess(Info, E, AK_Read) ||
      Result.Designator.Invalid)
    return false;
  QualType CharTy = Result.Designator.getType(Info.Ctx);
  bool IsRawByte = BuiltinOp == Builtin::BImemchr ||
                   BuiltinOp == Builtin::BI__builtin_memchr;
  assert(IsRawByte ||((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->
getArg(0)->getType()->getPointeeType())) ? static_cast<
void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7982, __PRETTY_FUNCTION__))
         Info.Ctx.hasSameUnqualifiedType(((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->
getArg(0)->getType()->getPointeeType())) ? static_cast<
void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7982, __PRETTY_FUNCTION__))
             CharTy, E->getArg(0)->getType()->getPointeeType()))((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->
getArg(0)->getType()->getPointeeType())) ? static_cast<
void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 7982, __PRETTY_FUNCTION__));
  // Pointers to const void may point to objects of incomplete type.
  if (IsRawByte && CharTy->isIncompleteType()) {
    Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy;
    return false;
  }
  // Give up on byte-oriented matching against multibyte elements.
  // FIXME: We can compare the bytes in the correct order.
  if (IsRawByte && Info.Ctx.getTypeSizeInChars(CharTy) != CharUnits::One())
    return false;
  // Figure out what value we're actually looking for (after converting to
  // the corresponding unsigned type if necessary).
  uint64_t DesiredVal;
  bool StopAtNull = false;
  switch (BuiltinOp) {
  case Builtin::BIstrchr:
  case Builtin::BI__builtin_strchr:
    // strchr compares directly to the passed integer, and therefore
    // always fails if given an int that is not a char.
    if (!APSInt::isSameValue(HandleIntToIntCast(Info, E, CharTy,
                                                E->getArg(1)->getType(),
                                                Desired),
                             Desired))
      return ZeroInitialization(E);
    StopAtNull = true;
    LLVM_FALLTHROUGH[[gnu::fallthrough]];
  case Builtin::BImemchr:
  case Builtin::BI__builtin_memchr:
  case Builtin::BI__builtin_char_memchr:
    // memchr compares by converting both sides to unsigned char. That's also
    // correct for strchr if we get this far (to cope with plain char being
    // unsigned in the strchr case).
    DesiredVal = Desired.trunc(Info.Ctx.getCharWidth()).getZExtValue();
    break;

  case Builtin::BIwcschr:
  case Builtin::BI__builtin_wcschr:
    StopAtNull = true;
    LLVM_FALLTHROUGH[[gnu::fallthrough]];
  case Builtin::BIwmemchr:
  case Builtin::BI__builtin_wmemchr:
    // wcschr and wmemchr are given a wchar_t to look for. Just use it.
    DesiredVal = Desired.getZExtValue();
    break;
  }

  for (; MaxLength; --MaxLength) {
    APValue Char;
    if (!handleLValueToRValueConversion(Info, E, CharTy, Result, Char) ||
        !Char.isInt())
      return false;
    if (Char.getInt().getZExtValue() == DesiredVal)
      return true;
    if (StopAtNull && !Char.getInt())
      break;
    if (!HandleLValueArrayAdjustment(Info, E, Result, CharTy, 1))
      return false;
  }
  // Not found: return nullptr.
  return ZeroInitialization(E);
}

case Builtin::BImemcpy:
case Builtin::BImemmove:
case Builtin::BIwmemcpy:
case Builtin::BIwmemmove:
  if (Info.getLangOpts().CPlusPlus11)
    Info.CCEDiag(E, diag::note_constexpr_invalid_function)
      << /*isConstexpr*/0 << /*isConstructor*/0
      << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'");
  else
    Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_memcpy:
case Builtin::BI__builtin_memmove:
case Builtin::BI__builtin_wmemcpy:
case Builtin::BI__builtin_wmemmove: {
  bool WChar = BuiltinOp == Builtin::BIwmemcpy ||
               BuiltinOp == Builtin::BIwmemmove ||
               BuiltinOp == Builtin::BI__builtin_wmemcpy ||
               BuiltinOp == Builtin::BI__builtin_wmemmove;
  bool Move = BuiltinOp == Builtin::BImemmove ||
              BuiltinOp == Builtin::BIwmemmove ||
              BuiltinOp == Builtin::BI__builtin_memmove ||
              BuiltinOp == Builtin::BI__builtin_wmemmove;

  // The result of mem* is the first argument.
  if (!Visit(E->getArg(0)))
    return false;
  LValue Dest = Result;

  LValue Src;
  if (!EvaluatePointer(E->getArg(1), Src, Info))
    return false;

  APSInt N;
  if (!EvaluateInteger(E->getArg(2), N, Info))
    return false;
  assert(!N.isSigned() && "memcpy and friends take an unsigned size")((!N.isSigned() && "memcpy and friends take an unsigned size"
) ? static_cast<void> (0) : __assert_fail ("!N.isSigned() && \"memcpy and friends take an unsigned size\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8080, __PRETTY_FUNCTION__));

  // If the size is zero, we treat this as always being a valid no-op.
  // (Even if one of the src and dest pointers is null.)
  if (!N)
    return true;

  // Otherwise, if either of the operands is null, we can't proceed. Don't
  // try to determine the type of the copied objects, because there aren't
  // any.
  if (!Src.Base || !Dest.Base) {
    APValue Val;
    (!Src.Base ? Src : Dest).moveInto(Val);
    Info.FFDiag(E, diag::note_constexpr_memcpy_null)
        << Move << WChar << !!Src.Base
        << Val.getAsString(Info.Ctx, E->getArg(0)->getType());
    return false;
  }
  if (Src.Designator.Invalid || Dest.Designator.Invalid)
    return false;

  // We require that Src and Dest are both pointers to arrays of
  // trivially-copyable type. (For the wide version, the designator will be
  // invalid if the designated object is not a wchar_t.)
  QualType T = Dest.Designator.getType(Info.Ctx);
  QualType SrcT = Src.Designator.getType(Info.Ctx);
  if (!Info.Ctx.hasSameUnqualifiedType(T, SrcT)) {
    Info.FFDiag(E, diag::note_constexpr_memcpy_type_pun) << Move << SrcT << T;
    return false;
  }
  if (T->isIncompleteType()) {
    Info.FFDiag(E, diag::note_constexpr_memcpy_incomplete_type) << Move << T;
    return false;
  }
  if (!T.isTriviallyCopyableType(Info.Ctx)) {
    Info.FFDiag(E, diag::note_constexpr_memcpy_nontrivial) << Move << T;
    return false;
  }

  // Figure out how many T's we're copying.
  uint64_t TSize = Info.Ctx.getTypeSizeInChars(T).getQuantity();
  if (!WChar) {
    uint64_t Remainder;
    llvm::APInt OrigN = N;
    llvm::APInt::udivrem(OrigN, TSize, N, Remainder);
    if (Remainder) {
      Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported)
          << Move << WChar << 0 << T << OrigN.toString(10, /*Signed*/false)
          << (unsigned)TSize;
      return false;
    }
  }

  // Check that the copying will remain within the arrays, just so that we
  // can give a more meaningful diagnostic. This implicitly also checks that
  // N fits into 64 bits.
  uint64_t RemainingSrcSize = Src.Designator.validIndexAdjustments().second;
  uint64_t RemainingDestSize = Dest.Designator.validIndexAdjustments().second;
  if (N.ugt(RemainingSrcSize) || N.ugt(RemainingDestSize)) {
    Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported)
        << Move << WChar << (N.ugt(RemainingSrcSize) ? 1 : 2) << T
        << N.toString(10, /*Signed*/false);
    return false;
  }
  uint64_t NElems = N.getZExtValue();
  uint64_t NBytes = NElems * TSize;

  // Check for overlap.
  int Direction = 1;
  if (HasSameBase(Src, Dest)) {
    uint64_t SrcOffset = Src.getLValueOffset().getQuantity();
    uint64_t DestOffset = Dest.getLValueOffset().getQuantity();
    if (DestOffset >= SrcOffset && DestOffset - SrcOffset < NBytes) {
      // Dest is inside the source region.
      if (!Move) {
        Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar;
        return false;
      }
      // For memmove and friends, copy backwards.
      if (!HandleLValueArrayAdjustment(Info, E, Src, T, NElems - 1) ||
          !HandleLValueArrayAdjustment(Info, E, Dest, T, NElems - 1))
        return false;
      Direction = -1;
    } else if (!Move && SrcOffset >= DestOffset &&
               SrcOffset - DestOffset < NBytes) {
      // Src is inside the destination region for memcpy: invalid.
      Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar;
      return false;
    }
  }

  while (true) {
    APValue Val;
    // FIXME: Set WantObjectRepresentation to true if we're copying a
    // char-like type?
    if (!handleLValueToRValueConversion(Info, E, T, Src, Val) ||
        !handleAssignment(Info, E, Dest, T, Val))
      return false;
    // Do not iterate past the last element; if we're copying backwards, that
    // might take us off the start of the array.
    if (--NElems == 0)
      return true;
    if (!HandleLValueArrayAdjustment(Info, E, Src, T, Direction) ||
        !HandleLValueArrayAdjustment(Info, E, Dest, T, Direction))
      return false;
  }
}

default:
  return visitNonBuiltinCallExpr(E);
}
8191}

8193static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This,
                                   APValue &Result, const InitListExpr *ILE,
                                   QualType AllocType);

8197bool PointerExprEvaluator::VisitCXXNewExpr(const CXXNewExpr *E) {
if (!Info.getLangOpts().CPlusPlus2a)
  Info.CCEDiag(E, diag::note_constexpr_new);

// We cannot speculatively evaluate a delete expression.
if (Info.SpeculativeEvaluationDepth)
  return false;

FunctionDecl *OperatorNew = E->getOperatorNew();
if (!OperatorNew->isReplaceableGlobalAllocationFunction()) {
  Info.FFDiag(E, diag::note_constexpr_new_non_replaceable)
      << isa<CXXMethodDecl>(OperatorNew) << OperatorNew;
  return false;
}

bool IsNothrow = false;
if (E->getNumPlacementArgs()) {
  // The only new-placement list we support is of the form (std::nothrow).
  //
  // FIXME: There is no restriction on this, but it's not clear that any
  // other form makes any sense. We get here for cases such as:
  //
  //   new (std::align_val_t{N}) X(int)
  //
  // (which should presumably be valid only if N is a multiple of
  // alignof(int), and in any case can't be deallocated unless N is
  // alignof(X) and X has new-extended alignment).
  if (E->getNumPlacementArgs() != 1 ||
      !E->getPlacementArg(0)->getType()->isNothrowT())
    return Error(E, diag::note_constexpr_new_placement);

  LValue Nothrow;
  if (!EvaluateLValue(E->getPlacementArg(0), Nothrow, Info))
    return false;
  IsNothrow = true;
}

const Expr *Init = E->getInitializer();
const InitListExpr *ResizedArrayILE = nullptr;

QualType AllocType = E->getAllocatedType();
if (Optional<const Expr*> ArraySize = E->getArraySize()) {
  const Expr *Stripped = *ArraySize;
  for (; auto *ICE = dyn_cast<ImplicitCastExpr>(Stripped);
       Stripped = ICE->getSubExpr())
    if (ICE->getCastKind() != CK_NoOp &&
        ICE->getCastKind() != CK_IntegralCast)
      break;

  llvm::APSInt ArrayBound;
  if (!EvaluateInteger(Stripped, ArrayBound, Info))
    return false;

  // C++ [expr.new]p9:
  //   The expression is erroneous if:
  //   -- [...] its value before converting to size_t [or] applying the
  //      second standard conversion sequence is less than zero
  if (ArrayBound.isSigned() && ArrayBound.isNegative()) {
    if (IsNothrow)
      return ZeroInitialization(E);

    Info.FFDiag(*ArraySize, diag::note_constexpr_new_negative)
        << ArrayBound << (*ArraySize)->getSourceRange();
    return false;
  }

  //   -- its value is such that the size of the allocated object would
  //      exceed the implementation-defined limit
  if (ConstantArrayType::getNumAddressingBits(Info.Ctx, AllocType,
                                              ArrayBound) >
      ConstantArrayType::getMaxSizeBits(Info.Ctx)) {
    if (IsNothrow)
      return ZeroInitialization(E);

    Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_large)
      << ArrayBound << (*ArraySize)->getSourceRange();
    return false;
  }

  //   -- the new-initializer is a braced-init-list and the number of
  //      array elements for which initializers are provided [...]
  //      exceeds the number of elements to initialize
  if (Init) {
    auto *CAT = Info.Ctx.getAsConstantArrayType(Init->getType());
    assert(CAT && "unexpected type for array initializer")((CAT && "unexpected type for array initializer") ? static_cast
<void> (0) : __assert_fail ("CAT && \"unexpected type for array initializer\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8281, __PRETTY_FUNCTION__));

    unsigned Bits =
        std::max(CAT->getSize().getBitWidth(), ArrayBound.getBitWidth());
    llvm::APInt InitBound = CAT->getSize().zextOrSelf(Bits);
    llvm::APInt AllocBound = ArrayBound.zextOrSelf(Bits);
    if (InitBound.ugt(AllocBound)) {
      if (IsNothrow)
        return ZeroInitialization(E);

      Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_small)
          << AllocBound.toString(10, /*Signed=*/false)
          << InitBound.toString(10, /*Signed=*/false)
          << (*ArraySize)->getSourceRange();
      return false;
    }

    // If the sizes differ, we must have an initializer list, and we need
    // special handling for this case when we initialize.
    if (InitBound != AllocBound)
      ResizedArrayILE = cast<InitListExpr>(Init);
  }

  AllocType = Info.Ctx.getConstantArrayType(AllocType, ArrayBound,
                                            ArrayType::Normal, 0);
} else {
  assert(!AllocType->isArrayType() &&((!AllocType->isArrayType() && "array allocation with non-array new"
) ? static_cast<void> (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8308, __PRETTY_FUNCTION__))
         "array allocation with non-array new")((!AllocType->isArrayType() && "array allocation with non-array new"
) ? static_cast<void> (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8308, __PRETTY_FUNCTION__));
}

// Perform the allocation and obtain a pointer to the resulting object.
APValue *Val = Info.createHeapAlloc(E, AllocType, Result);
if (!Val)
  return false;

if (ResizedArrayILE) {
  if (!EvaluateArrayNewInitList(Info, Result, *Val, ResizedArrayILE,
                                AllocType))
    return false;
} else if (Init) {
  if (!EvaluateInPlace(*Val, Info, Result, Init))
    return false;
} else {
  *Val = getDefaultInitValue(AllocType);
}

// Array new returns a pointer to the first element, not a pointer to the
// array.
if (auto *AT = AllocType->getAsArrayTypeUnsafe())
  Result.addArray(Info, E, cast<ConstantArrayType>(AT));

return true;
8333}
8334//===----------------------------------------------------------------------===//
8335// Member Pointer Evaluation
8336//===----------------------------------------------------------------------===//

8338namespace {
8339class MemberPointerExprEvaluator
: public ExprEvaluatorBase<MemberPointerExprEvaluator> {
MemberPtr &Result;

bool Success(const ValueDecl *D) {
  Result = MemberPtr(D);
  return true;
}
8347public:

MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result)
  : ExprEvaluatorBaseTy(Info), Result(Result) {}

bool Success(const APValue &V, const Expr *E) {
  Result.setFrom(V);
  return true;
}
bool ZeroInitialization(const Expr *E) {
  return Success((const ValueDecl*)nullptr);
}

bool VisitCastExpr(const CastExpr *E);
bool VisitUnaryAddrOf(const UnaryOperator *E);
8362};
8363} // end anonymous namespace

8365static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result,
                                EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isMemberPointerType())((E->isRValue() && E->getType()->isMemberPointerType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isMemberPointerType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8367, __PRETTY_FUNCTION__));
return MemberPointerExprEvaluator(Info, Result).Visit(E);
8369}

8371bool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) {
switch (E->getCastKind()) {
default:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);

case CK_NullToMemberPointer:
  VisitIgnoredValue(E->getSubExpr());
  return ZeroInitialization(E);

case CK_BaseToDerivedMemberPointer: {
  if (!Visit(E->getSubExpr()))
    return false;
  if (E->path_empty())
    return true;
  // Base-to-derived member pointer casts store the path in derived-to-base
  // order, so iterate backwards. The CXXBaseSpecifier also provides us with
  // the wrong end of the derived->base arc, so stagger the path by one class.
  typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter;
  for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin());
       PathI != PathE; ++PathI) {
    assert(!(*PathI)->isVirtual() && "memptr cast through vbase")((!(*PathI)->isVirtual() && "memptr cast through vbase"
) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8391, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl();
    if (!Result.castToDerived(Derived))
      return Error(E);
  }
  const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass();
  if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl()))
    return Error(E);
  return true;
}

case CK_DerivedToBaseMemberPointer:
  if (!Visit(E->getSubExpr()))
    return false;
  for (CastExpr::path_const_iterator PathI = E->path_begin(),
       PathE = E->path_end(); PathI != PathE; ++PathI) {
    assert(!(*PathI)->isVirtual() && "memptr cast through vbase")((!(*PathI)->isVirtual() && "memptr cast through vbase"
) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8407, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl();
    if (!Result.castToBase(Base))
      return Error(E);
  }
  return true;
}
8414}

8416bool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) {
// C++11 [expr.unary.op]p3 has very strict rules on how the address of a
// member can be formed.
return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl());
8420}

8422//===----------------------------------------------------------------------===//
8423// Record Evaluation
8424//===----------------------------------------------------------------------===//

8426namespace {
class RecordExprEvaluator
: public ExprEvaluatorBase<RecordExprEvaluator> {
  const LValue &This;
  APValue &Result;
public:

  RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result)
    : ExprEvaluatorBaseTy(info), This(This), Result(Result) {}

  bool Success(const APValue &V, const Expr *E) {
    Result = V;
    return true;
  }
  bool ZeroInitialization(const Expr *E) {
    return ZeroInitialization(E, E->getType());
  }
  bool ZeroInitialization(const Expr *E, QualType T);

  bool VisitCallExpr(const CallExpr *E) {
    return handleCallExpr(E, Result, &This);
  }
  bool VisitCastExpr(const CastExpr *E);
  bool VisitInitListExpr(const InitListExpr *E);
  bool VisitCXXConstructExpr(const CXXConstructExpr *E) {
    return VisitCXXConstructExpr(E, E->getType());
  }
  bool VisitLambdaExpr(const LambdaExpr *E);
  bool VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E);
  bool VisitCXXConstructExpr(const CXXConstructExpr *E, QualType T);
  bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E);
  bool VisitBinCmp(const BinaryOperator *E);
};
8459}

8461/// Perform zero-initialization on an object of non-union class type.
8462/// C++11 [dcl.init]p5:
8463///  To zero-initialize an object or reference of type T means:
8464///    [...]
8465///    -- if T is a (possibly cv-qualified) non-union class type,
8466///       each non-static data member and each base-class subobject is
8467///       zero-initialized
8468static bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E,
                                        const RecordDecl *RD,
                                        const LValue &This, APValue &Result) {
assert(!RD->isUnion() && "Expected non-union class type")((!RD->isUnion() && "Expected non-union class type"
) ? static_cast<void> (0) : __assert_fail ("!RD->isUnion() && \"Expected non-union class type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8471, __PRETTY_FUNCTION__));
const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD);
Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0,
                 std::distance(RD->field_begin(), RD->field_end()));

if (RD->isInvalidDecl()) return false;
const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);

if (CD) {
  unsigned Index = 0;
  for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(),
         End = CD->bases_end(); I != End; ++I, ++Index) {
    const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
    LValue Subobject = This;
    if (!HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout))
      return false;
    if (!HandleClassZeroInitialization(Info, E, Base, Subobject,
                                       Result.getStructBase(Index)))
      return false;
  }
}

for (const auto *I : RD->fields()) {
  // -- if T is a reference type, no initialization is performed.
  if (I->getType()->isReferenceType())
    continue;

  LValue Subobject = This;
  if (!HandleLValueMember(Info, E, Subobject, I, &Layout))
    return false;

  ImplicitValueInitExpr VIE(I->getType());
  if (!EvaluateInPlace(
        Result.getStructField(I->getFieldIndex()), Info, Subobject, &VIE))
    return false;
}

return true;
8509}

8511bool RecordExprEvaluator::ZeroInitialization(const Expr *E, QualType T) {
const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
if (RD->isInvalidDecl()) return false;
if (RD->isUnion()) {
  // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the
  // object's first non-static named data member is zero-initialized
  RecordDecl::field_iterator I = RD->field_begin();
  if (I == RD->field_end()) {
    Result = APValue((const FieldDecl*)nullptr);
    return true;
  }

  LValue Subobject = This;
  if (!HandleLValueMember(Info, E, Subobject, *I))
    return false;
  Result = APValue(*I);
  ImplicitValueInitExpr VIE(I->getType());
  return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE);
}

if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) {
  Info.FFDiag(E, diag::note_constexpr_virtual_base) << RD;
  return false;
}

return HandleClassZeroInitialization(Info, E, RD, This, Result);
8537}

8539bool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) {
switch (E->getCastKind()) {
default:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);

case CK_ConstructorConversion:
  return Visit(E->getSubExpr());

case CK_DerivedToBase:
case CK_UncheckedDerivedToBase: {
  APValue DerivedObject;
  if (!Evaluate(DerivedObject, Info, E->getSubExpr()))
    return false;
  if (!DerivedObject.isStruct())
    return Error(E->getSubExpr());

  // Derived-to-base rvalue conversion: just slice off the derived part.
  APValue *Value = &DerivedObject;
  const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl();
  for (CastExpr::path_const_iterator PathI = E->path_begin(),
       PathE = E->path_end(); PathI != PathE; ++PathI) {
    assert(!(*PathI)->isVirtual() && "record rvalue with virtual base")((!(*PathI)->isVirtual() && "record rvalue with virtual base"
) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"record rvalue with virtual base\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8560, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl();
    Value = &Value->getStructBase(getBaseIndex(RD, Base));
    RD = Base;
  }
  Result = *Value;
  return true;
}
}
8569}

8571bool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
if (E->isTransparent())
  return Visit(E->getInit(0));

const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl();
if (RD->isInvalidDecl()) return false;
const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);
auto *CXXRD = dyn_cast<CXXRecordDecl>(RD);

EvalInfo::EvaluatingConstructorRAII EvalObj(
    Info,
    ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries},
    CXXRD && CXXRD->getNumBases());

if (RD->isUnion()) {
  const FieldDecl *Field = E->getInitializedFieldInUnion();
  Result = APValue(Field);
  if (!Field)
    return true;

  // If the initializer list for a union does not contain any elements, the
  // first element of the union is value-initialized.
  // FIXME: The element should be initialized from an initializer list.
  //        Is this difference ever observable for initializer lists which
  //        we don't build?
  ImplicitValueInitExpr VIE(Field->getType());
  const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE;

  LValue Subobject = This;
  if (!HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout))
    return false;

  // Temporarily override This, in case there's a CXXDefaultInitExpr in here.
  ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This,
                                isa<CXXDefaultInitExpr>(InitExpr));

  return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr);
}

if (!Result.hasValue())
  Result = APValue(APValue::UninitStruct(), CXXRD ? CXXRD->getNumBases() : 0,
                   std::distance(RD->field_begin(), RD->field_end()));
unsigned ElementNo = 0;
bool Success = true;

// Initialize base classes.
if (CXXRD && CXXRD->getNumBases()) {
  for (const auto &Base : CXXRD->bases()) {
    assert(ElementNo < E->getNumInits() && "missing init for base class")((ElementNo < E->getNumInits() && "missing init for base class"
) ? static_cast<void> (0) : __assert_fail ("ElementNo < E->getNumInits() && \"missing init for base class\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8619, __PRETTY_FUNCTION__));
    const Expr *Init = E->getInit(ElementNo);

    LValue Subobject = This;
    if (!HandleLValueBase(Info, Init, Subobject, CXXRD, &Base))
      return false;

    APValue &FieldVal = Result.getStructBase(ElementNo);
    if (!EvaluateInPlace(FieldVal, Info, Subobject, Init)) {
      if (!Info.noteFailure())
        return false;
      Success = false;
    }
    ++ElementNo;
  }

  EvalObj.finishedConstructingBases();
}

// Initialize members.
for (const auto *Field : RD->fields()) {
  // Anonymous bit-fields are not considered members of the class for
  // purposes of aggregate initialization.
  if (Field->isUnnamedBitfield())
    continue;

  LValue Subobject = This;

  bool HaveInit = ElementNo < E->getNumInits();

  // FIXME: Diagnostics here should point to the end of the initializer
  // list, not the start.
  if (!HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E,
                          Subobject, Field, &Layout))
    return false;

  // Perform an implicit value-initialization for members beyond the end of
  // the initializer list.
  ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType());
  const Expr *Init = HaveInit ? E->getInit(ElementNo++) : &VIE;

  // Temporarily override This, in case there's a CXXDefaultInitExpr in here.
  ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This,
                                isa<CXXDefaultInitExpr>(Init));

  APValue &FieldVal = Result.getStructField(Field->getFieldIndex());
  if (!EvaluateInPlace(FieldVal, Info, Subobject, Init) ||
      (Field->isBitField() && !truncateBitfieldValue(Info, Init,
                                                     FieldVal, Field))) {
    if (!Info.noteFailure())
      return false;
    Success = false;
  }
}

return Success;
8675}

8677bool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E,
                                              QualType T) {
// Note that E's type is not necessarily the type of our class here; we might
// be initializing an array element instead.
const CXXConstructorDecl *FD = E->getConstructor();
if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) return false;

bool ZeroInit = E->requiresZeroInitialization();
if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) {
  // If we've already performed zero-initialization, we're already done.
  if (Result.hasValue())
    return true;

  if (ZeroInit)
    return ZeroInitialization(E, T);

  Result = getDefaultInitValue(T);
  return true;
}

const FunctionDecl *Definition = nullptr;
auto Body = FD->getBody(Definition);

if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body))
  return false;

// Avoid materializing a temporary for an elidable copy/move constructor.
if (E->isElidable() && !ZeroInit)
  if (const MaterializeTemporaryExpr *ME
        = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0)))
    return Visit(ME->GetTemporaryExpr());

if (ZeroInit && !ZeroInitialization(E, T))
  return false;

auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs());
return HandleConstructorCall(E, This, Args,
                             cast<CXXConstructorDecl>(Definition), Info,
                             Result);
8716}

8718bool RecordExprEvaluator::VisitCXXInheritedCtorInitExpr(
  const CXXInheritedCtorInitExpr *E) {
if (!Info.CurrentCall) {
  assert(Info.checkingPotentialConstantExpression())((Info.checkingPotentialConstantExpression()) ? static_cast<
void> (0) : __assert_fail ("Info.checkingPotentialConstantExpression()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8721, __PRETTY_FUNCTION__));
  return false;
}

const CXXConstructorDecl *FD = E->getConstructor();
if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl())
  return false;

const FunctionDecl *Definition = nullptr;
auto Body = FD->getBody(Definition);

if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body))
  return false;

return HandleConstructorCall(E, This, Info.CurrentCall->Arguments,
                             cast<CXXConstructorDecl>(Definition), Info,
                             Result);
8738}

8740bool RecordExprEvaluator::VisitCXXStdInitializerListExpr(
  const CXXStdInitializerListExpr *E) {
const ConstantArrayType *ArrayType =
    Info.Ctx.getAsConstantArrayType(E->getSubExpr()->getType());

LValue Array;
if (!EvaluateLValue(E->getSubExpr(), Array, Info))
  return false;

// Get a pointer to the first element of the array.
Array.addArray(Info, E, ArrayType);

// FIXME: Perform the checks on the field types in SemaInit.
RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl();
RecordDecl::field_iterator Field = Record->field_begin();
if (Field == Record->field_end())
  return Error(E);

// Start pointer.
if (!Field->getType()->isPointerType() ||
    !Info.Ctx.hasSameType(Field->getType()->getPointeeType(),
                          ArrayType->getElementType()))
  return Error(E);

// FIXME: What if the initializer_list type has base classes, etc?
Result = APValue(APValue::UninitStruct(), 0, 2);
Array.moveInto(Result.getStructField(0));

if (++Field == Record->field_end())
  return Error(E);

if (Field->getType()->isPointerType() &&
    Info.Ctx.hasSameType(Field->getType()->getPointeeType(),
                         ArrayType->getElementType())) {
  // End pointer.
  if (!HandleLValueArrayAdjustment(Info, E, Array,
                                   ArrayType->getElementType(),
                                   ArrayType->getSize().getZExtValue()))
    return false;
  Array.moveInto(Result.getStructField(1));
} else if (Info.Ctx.hasSameType(Field->getType(), Info.Ctx.getSizeType()))
  // Length.
  Result.getStructField(1) = APValue(APSInt(ArrayType->getSize()));
else
  return Error(E);

if (++Field != Record->field_end())
  return Error(E);

return true;
8790}

8792bool RecordExprEvaluator::VisitLambdaExpr(const LambdaExpr *E) {
const CXXRecordDecl *ClosureClass = E->getLambdaClass();
if (ClosureClass->isInvalidDecl())
  return false;

const size_t NumFields =
    std::distance(ClosureClass->field_begin(), ClosureClass->field_end());

assert(NumFields == (size_t)std::distance(E->capture_init_begin(),((NumFields == (size_t)std::distance(E->capture_init_begin
(), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of "
 "fields within the closure type") ? static_cast<void> (
0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8803, __PRETTY_FUNCTION__))
                                          E->capture_init_end()) &&((NumFields == (size_t)std::distance(E->capture_init_begin
(), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of "
 "fields within the closure type") ? static_cast<void> (
0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8803, __PRETTY_FUNCTION__))
       "The number of lambda capture initializers should equal the number of "((NumFields == (size_t)std::distance(E->capture_init_begin
(), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of "
 "fields within the closure type") ? static_cast<void> (
0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8803, __PRETTY_FUNCTION__))
       "fields within the closure type")((NumFields == (size_t)std::distance(E->capture_init_begin
(), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of "
 "fields within the closure type") ? static_cast<void> (
0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8803, __PRETTY_FUNCTION__));

Result = APValue(APValue::UninitStruct(), /*NumBases*/0, NumFields);
// Iterate through all the lambda's closure object's fields and initialize
// them.
auto *CaptureInitIt = E->capture_init_begin();
const LambdaCapture *CaptureIt = ClosureClass->captures_begin();
bool Success = true;
for (const auto *Field : ClosureClass->fields()) {
  assert(CaptureInitIt != E->capture_init_end())((CaptureInitIt != E->capture_init_end()) ? static_cast<
void> (0) : __assert_fail ("CaptureInitIt != E->capture_init_end()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8812, __PRETTY_FUNCTION__));
  // Get the initializer for this field
  Expr *const CurFieldInit = *CaptureInitIt++;

  // If there is no initializer, either this is a VLA or an error has
  // occurred.
  if (!CurFieldInit)
    return Error(E);

  APValue &FieldVal = Result.getStructField(Field->getFieldIndex());
  if (!EvaluateInPlace(FieldVal, Info, This, CurFieldInit)) {
    if (!Info.keepEvaluatingAfterFailure())
      return false;
    Success = false;
  }
  ++CaptureIt;
}
return Success;
8830}

8832static bool EvaluateRecord(const Expr *E, const LValue &This,
                         APValue &Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isRecordType() &&((E->isRValue() && E->getType()->isRecordType
() && "can't evaluate expression as a record rvalue")
 ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8835, __PRETTY_FUNCTION__))
       "can't evaluate expression as a record rvalue")((E->isRValue() && E->getType()->isRecordType
() && "can't evaluate expression as a record rvalue")
 ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8835, __PRETTY_FUNCTION__));
return RecordExprEvaluator(Info, This, Result).Visit(E);
8837}

8839//===----------------------------------------------------------------------===//
8840// Temporary Evaluation
8841//
8842// Temporaries are represented in the AST as rvalues, but generally behave like
8843// lvalues. The full-object of which the temporary is a subobject is implicitly
8844// materialized so that a reference can bind to it.
8845//===----------------------------------------------------------------------===//
8846namespace {
8847class TemporaryExprEvaluator
: public LValueExprEvaluatorBase<TemporaryExprEvaluator> {
8849public:
TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) :
  LValueExprEvaluatorBaseTy(Info, Result, false) {}

/// Visit an expression which constructs the value of this temporary.
bool VisitConstructExpr(const Expr *E) {
  APValue &Value =
      Info.CurrentCall->createTemporary(E, E->getType(), false, Result);
  return EvaluateInPlace(Value, Info, Result, E);
}

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    return LValueExprEvaluatorBaseTy::VisitCastExpr(E);

  case CK_ConstructorConversion:
    return VisitConstructExpr(E->getSubExpr());
  }
}
bool VisitInitListExpr(const InitListExpr *E) {
  return VisitConstructExpr(E);
}
bool VisitCXXConstructExpr(const CXXConstructExpr *E) {
  return VisitConstructExpr(E);
}
bool VisitCallExpr(const CallExpr *E) {
  return VisitConstructExpr(E);
}
bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E) {
  return VisitConstructExpr(E);
}
bool VisitLambdaExpr(const LambdaExpr *E) {
  return VisitConstructExpr(E);
}
8884};
8885} // end anonymous namespace

8887/// Evaluate an expression of record type as a temporary.
8888static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isRecordType())((E->isRValue() && E->getType()->isRecordType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8889, __PRETTY_FUNCTION__));
return TemporaryExprEvaluator(Info, Result).Visit(E);
8891}

8893//===----------------------------------------------------------------------===//
8894// Vector Evaluation
8895//===----------------------------------------------------------------------===//

8897namespace {
class VectorExprEvaluator
: public ExprEvaluatorBase<VectorExprEvaluator> {
  APValue &Result;
public:

  VectorExprEvaluator(EvalInfo &info, APValue &Result)
    : ExprEvaluatorBaseTy(info), Result(Result) {}

  bool Success(ArrayRef<APValue> V, const Expr *E) {
    assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements())((V.size() == E->getType()->castAs<VectorType>()->
getNumElements()) ? static_cast<void> (0) : __assert_fail
 ("V.size() == E->getType()->castAs<VectorType>()->getNumElements()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8907, __PRETTY_FUNCTION__));
    // FIXME: remove this APValue copy.
    Result = APValue(V.data(), V.size());
    return true;
  }
  bool Success(const APValue &V, const Expr *E) {
    assert(V.isVector())((V.isVector()) ? static_cast<void> (0) : __assert_fail
 ("V.isVector()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8913, __PRETTY_FUNCTION__));
    Result = V;
    return true;
  }
  bool ZeroInitialization(const Expr *E);

  bool VisitUnaryReal(const UnaryOperator *E)
    { return Visit(E->getSubExpr()); }
  bool VisitCastExpr(const CastExpr* E);
  bool VisitInitListExpr(const InitListExpr *E);
  bool VisitUnaryImag(const UnaryOperator *E);
  // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div,
  //                 binary comparisons, binary and/or/xor,
  //                 shufflevector, ExtVectorElementExpr
};
8928} // end anonymous namespace

8930static bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue")((E->isRValue() && E->getType()->isVectorType
() &&"not a vector rvalue") ? static_cast<void>
 (0) : __assert_fail ("E->isRValue() && E->getType()->isVectorType() &&\"not a vector rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 8931, __PRETTY_FUNCTION__));
return VectorExprEvaluator(Info, Result).Visit(E);
8933}

8935bool VectorExprEvaluator::VisitCastExpr(const CastExpr *E) {
const VectorType *VTy = E->getType()->castAs<VectorType>();
unsigned NElts = VTy->getNumElements();

const Expr *SE = E->getSubExpr();
QualType SETy = SE->getType();

switch (E->getCastKind()) {
case CK_VectorSplat: {
  APValue Val = APValue();
  if (SETy->isIntegerType()) {
    APSInt IntResult;
    if (!EvaluateInteger(SE, IntResult, Info))
      return false;
    Val = APValue(std::move(IntResult));
  } else if (SETy->isRealFloatingType()) {
    APFloat FloatResult(0.0);
    if (!EvaluateFloat(SE, FloatResult, Info))
      return false;
    Val = APValue(std::move(FloatResult));
  } else {
    return Error(E);
  }

  // Splat and create vector APValue.
  SmallVector<APValue, 4> Elts(NElts, Val);
  return Success(Elts, E);
}
case CK_BitCast: {
  // Evaluate the operand into an APInt we can extract from.
  llvm::APInt SValInt;
  if (!EvalAndBitcastToAPInt(Info, SE, SValInt))
    return false;
  // Extract the elements
  QualType EltTy = VTy->getElementType();
  unsigned EltSize = Info.Ctx.getTypeSize(EltTy);
  bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian();
  SmallVector<APValue, 4> Elts;
  if (EltTy->isRealFloatingType()) {
    const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy);
    unsigned FloatEltSize = EltSize;
    if (&Sem == &APFloat::x87DoubleExtended())
      FloatEltSize = 80;
    for (unsigned i = 0; i < NElts; i++) {
      llvm::APInt Elt;
      if (BigEndian)
        Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize);
      else
        Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize);
      Elts.push_back(APValue(APFloat(Sem, Elt)));
    }
  } else if (EltTy->isIntegerType()) {
    for (unsigned i = 0; i < NElts; i++) {
      llvm::APInt Elt;
      if (BigEndian)
        Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize);
      else
        Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize);
      Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType())));
    }
  } else {
    return Error(E);
  }
  return Success(Elts, E);
}
default:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);
}
9003}

9005bool
9006VectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
const VectorType *VT = E->getType()->castAs<VectorType>();
unsigned NumInits = E->getNumInits();
unsigned NumElements = VT->getNumElements();

QualType EltTy = VT->getElementType();
SmallVector<APValue, 4> Elements;

// The number of initializers can be less than the number of
// vector elements. For OpenCL, this can be due to nested vector
// initialization. For GCC compatibility, missing trailing elements
// should be initialized with zeroes.
unsigned CountInits = 0, CountElts = 0;
while (CountElts < NumElements) {
  // Handle nested vector initialization.
  if (CountInits < NumInits
      && E->getInit(CountInits)->getType()->isVectorType()) {
    APValue v;
    if (!EvaluateVector(E->getInit(CountInits), v, Info))
      return Error(E);
    unsigned vlen = v.getVectorLength();
    for (unsigned j = 0; j < vlen; j++)
      Elements.push_back(v.getVectorElt(j));
    CountElts += vlen;
  } else if (EltTy->isIntegerType()) {
    llvm::APSInt sInt(32);
    if (CountInits < NumInits) {
      if (!EvaluateInteger(E->getInit(CountInits), sInt, Info))
        return false;
    } else // trailing integer zero.
      sInt = Info.Ctx.MakeIntValue(0, EltTy);
    Elements.push_back(APValue(sInt));
    CountElts++;
  } else {
    llvm::APFloat f(0.0);
    if (CountInits < NumInits) {
      if (!EvaluateFloat(E->getInit(CountInits), f, Info))
        return false;
    } else // trailing float zero.
      f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy));
    Elements.push_back(APValue(f));
    CountElts++;
  }
  CountInits++;
}
return Success(Elements, E);
9052}

9054bool
9055VectorExprEvaluator::ZeroInitialization(const Expr *E) {
const VectorType *VT = E->getType()->getAs<VectorType>();
QualType EltTy = VT->getElementType();
APValue ZeroElement;
if (EltTy->isIntegerType())
  ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy));
else
  ZeroElement =
      APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)));

SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement);
return Success(Elements, E);
9067}

9069bool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
VisitIgnoredValue(E->getSubExpr());
return ZeroInitialization(E);
9072}

9074//===----------------------------------------------------------------------===//
9075// Array Evaluation
9076//===----------------------------------------------------------------------===//

9078namespace {
class ArrayExprEvaluator
: public ExprEvaluatorBase<ArrayExprEvaluator> {
  const LValue &This;
  APValue &Result;
public:

  ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result)
    : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {}

  bool Success(const APValue &V, const Expr *E) {
    assert(V.isArray() && "expected array")((V.isArray() && "expected array") ? static_cast<void
> (0) : __assert_fail ("V.isArray() && \"expected array\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9089, __PRETTY_FUNCTION__));
    Result = V;
    return true;
  }

  bool ZeroInitialization(const Expr *E) {
    const ConstantArrayType *CAT =
        Info.Ctx.getAsConstantArrayType(E->getType());
    if (!CAT)
      return Error(E);

    Result = APValue(APValue::UninitArray(), 0,
                     CAT->getSize().getZExtValue());
    if (!Result.hasArrayFiller()) return true;

    // Zero-initialize all elements.
    LValue Subobject = This;
    Subobject.addArray(Info, E, CAT);
    ImplicitValueInitExpr VIE(CAT->getElementType());
    return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE);
  }

  bool VisitCallExpr(const CallExpr *E) {
    return handleCallExpr(E, Result, &This);
  }
  bool VisitInitListExpr(const InitListExpr *E,
                         QualType AllocType = QualType());
  bool VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E);
  bool VisitCXXConstructExpr(const CXXConstructExpr *E);
  bool VisitCXXConstructExpr(const CXXConstructExpr *E,
                             const LValue &Subobject,
                             APValue *Value, QualType Type);
  bool VisitStringLiteral(const StringLiteral *E,
                          QualType AllocType = QualType()) {
    expandStringLiteral(Info, E, Result, AllocType);
    return true;
  }
};
9127} // end anonymous namespace

9129static bool EvaluateArray(const Expr *E, const LValue &This,
                        APValue &Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue")((E->isRValue() && E->getType()->isArrayType
() && "not an array rvalue") ? static_cast<void>
 (0) : __assert_fail ("E->isRValue() && E->getType()->isArrayType() && \"not an array rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9131, __PRETTY_FUNCTION__));
return ArrayExprEvaluator(Info, This, Result).Visit(E);
9133}

9135static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This,
                                   APValue &Result, const InitListExpr *ILE,
                                   QualType AllocType) {
assert(ILE->isRValue() && ILE->getType()->isArrayType() &&((ILE->isRValue() && ILE->getType()->isArrayType
() && "not an array rvalue") ? static_cast<void>
 (0) : __assert_fail ("ILE->isRValue() && ILE->getType()->isArrayType() && \"not an array rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9139, __PRETTY_FUNCTION__))
       "not an array rvalue")((ILE->isRValue() && ILE->getType()->isArrayType
() && "not an array rvalue") ? static_cast<void>
 (0) : __assert_fail ("ILE->isRValue() && ILE->getType()->isArrayType() && \"not an array rvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9139, __PRETTY_FUNCTION__));
return ArrayExprEvaluator(Info, This, Result)
    .VisitInitListExpr(ILE, AllocType);
9142}

9144// Return true iff the given array filler may depend on the element index.
9145static bool MaybeElementDependentArrayFiller(const Expr *FillerExpr) {
// For now, just whitelist non-class value-initialization and initialization
// lists comprised of them.
if (isa<ImplicitValueInitExpr>(FillerExpr))
  return false;
if (const InitListExpr *ILE = dyn_cast<InitListExpr>(FillerExpr)) {
  for (unsigned I = 0, E = ILE->getNumInits(); I != E; ++I) {
    if (MaybeElementDependentArrayFiller(ILE->getInit(I)))
      return true;
  }
  return false;
}
return true;
9158}

9160bool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E,
                                         QualType AllocType) {
const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(
    AllocType.isNull() ? E->getType() : AllocType);
if (!CAT)
  return Error(E);

// C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...]
// an appropriately-typed string literal enclosed in braces.
if (E->isStringLiteralInit()) {
  auto *SL = dyn_cast<StringLiteral>(E->getInit(0)->IgnoreParens());
  // FIXME: Support ObjCEncodeExpr here once we support it in
  // ArrayExprEvaluator generally.
  if (!SL)
    return Error(E);
  return VisitStringLiteral(SL, AllocType);
}

bool Success = true;

assert((!Result.isArray() || Result.getArrayInitializedElts() == 0) &&(((!Result.isArray() || Result.getArrayInitializedElts() == 0
) && "zero-initialized array shouldn't have any initialized elts"
) ? static_cast<void> (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9181, __PRETTY_FUNCTION__))
       "zero-initialized array shouldn't have any initialized elts")(((!Result.isArray() || Result.getArrayInitializedElts() == 0
) && "zero-initialized array shouldn't have any initialized elts"
) ? static_cast<void> (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9181, __PRETTY_FUNCTION__));
APValue Filler;
if (Result.isArray() && Result.hasArrayFiller())
  Filler = Result.getArrayFiller();

unsigned NumEltsToInit = E->getNumInits();
unsigned NumElts = CAT->getSize().getZExtValue();
const Expr *FillerExpr = E->hasArrayFiller() ? E->getArrayFiller() : nullptr;

// If the initializer might depend on the array index, run it for each
// array element.
if (NumEltsToInit != NumElts && MaybeElementDependentArrayFiller(FillerExpr))
  NumEltsToInit = NumElts;

LLVM_DEBUG(llvm::dbgs() << "The number of elements to initialize: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("exprconstant")) { llvm::dbgs() << "The number of elements to initialize: "
 << NumEltsToInit << ".\n"; } } while (false)
                        << NumEltsToInit << ".\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("exprconstant")) { llvm::dbgs() << "The number of elements to initialize: "
 << NumEltsToInit << ".\n"; } } while (false);

Result = APValue(APValue::UninitArray(), NumEltsToInit, NumElts);

// If the array was previously zero-initialized, preserve the
// zero-initialized values.
if (Filler.hasValue()) {
  for (unsigned I = 0, E = Result.getArrayInitializedElts(); I != E; ++I)
    Result.getArrayInitializedElt(I) = Filler;
  if (Result.hasArrayFiller())
    Result.getArrayFiller() = Filler;
}

LValue Subobject = This;
Subobject.addArray(Info, E, CAT);
for (unsigned Index = 0; Index != NumEltsToInit; ++Index) {
  const Expr *Init =
      Index < E->getNumInits() ? E->getInit(Index) : FillerExpr;
  if (!EvaluateInPlace(Result.getArrayInitializedElt(Index),
                       Info, Subobject, Init) ||
      !HandleLValueArrayAdjustment(Info, Init, Subobject,
                                   CAT->getElementType(), 1)) {
    if (!Info.noteFailure())
      return false;
    Success = false;
  }
}

if (!Result.hasArrayFiller())
  return Success;

// If we get here, we have a trivial filler, which we can just evaluate
// once and splat over the rest of the array elements.
assert(FillerExpr && "no array filler for incomplete init list")((FillerExpr && "no array filler for incomplete init list"
) ? static_cast<void> (0) : __assert_fail ("FillerExpr && \"no array filler for incomplete init list\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9229, __PRETTY_FUNCTION__));
return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject,
                       FillerExpr) && Success;
9232}

9234bool ArrayExprEvaluator::VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E) {
LValue CommonLV;
if (E->getCommonExpr() &&
    !Evaluate(Info.CurrentCall->createTemporary(
                  E->getCommonExpr(),
                  getStorageType(Info.Ctx, E->getCommonExpr()), false,
                  CommonLV),
              Info, E->getCommonExpr()->getSourceExpr()))
  return false;

auto *CAT = cast<ConstantArrayType>(E->getType()->castAsArrayTypeUnsafe());

uint64_t Elements = CAT->getSize().getZExtValue();
Result = APValue(APValue::UninitArray(), Elements, Elements);

LValue Subobject = This;
Subobject.addArray(Info, E, CAT);

bool Success = true;
for (EvalInfo::ArrayInitLoopIndex Index(Info); Index != Elements; ++Index) {
  if (!EvaluateInPlace(Result.getArrayInitializedElt(Index),
                       Info, Subobject, E->getSubExpr()) ||
      !HandleLValueArrayAdjustment(Info, E, Subobject,
                                   CAT->getElementType(), 1)) {
    if (!Info.noteFailure())
      return false;
    Success = false;
  }
}

return Success;
9265}

9267bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) {
return VisitCXXConstructExpr(E, This, &Result, E->getType());
9269}

9271bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E,
                                             const LValue &Subobject,
                                             APValue *Value,
                                             QualType Type) {
bool HadZeroInit = Value->hasValue();

if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(Type)) {
  unsigned N = CAT->getSize().getZExtValue();

  // Preserve the array filler if we had prior zero-initialization.
  APValue Filler =
    HadZeroInit && Value->hasArrayFiller() ? Value->getArrayFiller()
                                           : APValue();

  *Value = APValue(APValue::UninitArray(), N, N);

  if (HadZeroInit)
    for (unsigned I = 0; I != N; ++I)
      Value->getArrayInitializedElt(I) = Filler;

  // Initialize the elements.
  LValue ArrayElt = Subobject;
  ArrayElt.addArray(Info, E, CAT);
  for (unsigned I = 0; I != N; ++I)
    if (!VisitCXXConstructExpr(E, ArrayElt, &Value->getArrayInitializedElt(I),
                               CAT->getElementType()) ||
        !HandleLValueArrayAdjustment(Info, E, ArrayElt,
                                     CAT->getElementType(), 1))
      return false;

  return true;
}

if (!Type->isRecordType())
  return Error(E);

return RecordExprEvaluator(Info, Subobject, *Value)
           .VisitCXXConstructExpr(E, Type);
9309}

9311//===----------------------------------------------------------------------===//
9312// Integer Evaluation
9313//
9314// As a GNU extension, we support casting pointers to sufficiently-wide integer
9315// types and back in constant folding. Integer values are thus represented
9316// either as an integer-valued APValue, or as an lvalue-valued APValue.
9317//===----------------------------------------------------------------------===//

9319namespace {
9320class IntExprEvaluator
      : public ExprEvaluatorBase<IntExprEvaluator> {
APValue &Result;
9323public:
IntExprEvaluator(EvalInfo &info, APValue &result)
    : ExprEvaluatorBaseTy(info), Result(result) {}

bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) {
  assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9329, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9329, __PRETTY_FUNCTION__));
  assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() &&((SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType
() && "Invalid evaluation result.") ? static_cast<
void> (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9331, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType
() && "Invalid evaluation result.") ? static_cast<
void> (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9331, __PRETTY_FUNCTION__));
  assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&((SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9333, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9333, __PRETTY_FUNCTION__));
  Result = APValue(SI);
  return true;
}
bool Success(const llvm::APSInt &SI, const Expr *E) {
  return Success(SI, E, Result);
}

bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) {
  assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9343, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9343, __PRETTY_FUNCTION__));
  assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&((I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9345, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9345, __PRETTY_FUNCTION__));
  Result = APValue(APSInt(I));
  Result.getInt().setIsUnsigned(
                          E->getType()->isUnsignedIntegerOrEnumerationType());
  return true;
}
bool Success(const llvm::APInt &I, const Expr *E) {
  return Success(I, E, Result);
}

bool Success(uint64_t Value, const Expr *E, APValue &Result) {
  assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9357, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9357, __PRETTY_FUNCTION__));
  Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType()));
  return true;
}
bool Success(uint64_t Value, const Expr *E) {
  return Success(Value, E, Result);
}

bool Success(CharUnits Size, const Expr *E) {
  return Success(Size.getQuantity(), E);
}

bool Success(const APValue &V, const Expr *E) {
  if (V.isLValue() || V.isAddrLabelDiff() || V.isIndeterminate()) {
    Result = V;
    return true;
  }
  return Success(V.getInt(), E);
}

bool ZeroInitialization(const Expr *E) { return Success(0, E); }

//===--------------------------------------------------------------------===//
//                            Visitor Methods
//===--------------------------------------------------------------------===//

bool VisitConstantExpr(const ConstantExpr *E);

bool VisitIntegerLiteral(const IntegerLiteral *E) {
  return Success(E->getValue(), E);
}
bool VisitCharacterLiteral(const CharacterLiteral *E) {
  return Success(E->getValue(), E);
}

bool CheckReferencedDecl(const Expr *E, const Decl *D);
bool VisitDeclRefExpr(const DeclRefExpr *E) {
  if (CheckReferencedDecl(E, E->getDecl()))
    return true;

  return ExprEvaluatorBaseTy::VisitDeclRefExpr(E);
}
bool VisitMemberExpr(const MemberExpr *E) {
  if (CheckReferencedDecl(E, E->getMemberDecl())) {
    VisitIgnoredBaseExpression(E->getBase());
    return true;
  }

  return ExprEvaluatorBaseTy::VisitMemberExpr(E);
}

bool VisitCallExpr(const CallExpr *E);
bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp);
bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitOffsetOfExpr(const OffsetOfExpr *E);
bool VisitUnaryOperator(const UnaryOperator *E);

bool VisitCastExpr(const CastExpr* E);
bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);

bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
  return Success(E->getValue(), E);
}

bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
  return Success(E->getValue(), E);
}

bool VisitArrayInitIndexExpr(const ArrayInitIndexExpr *E) {
  if (Info.ArrayInitIndex == uint64_t(-1)) {
    // We were asked to evaluate this subexpression independent of the
    // enclosing ArrayInitLoopExpr. We can't do that.
    Info.FFDiag(E);
    return false;
  }
  return Success(Info.ArrayInitIndex, E);
}

// Note, GNU defines __null as an integer, not a pointer.
bool VisitGNUNullExpr(const GNUNullExpr *E) {
  return ZeroInitialization(E);
}

bool VisitTypeTraitExpr(const TypeTraitExpr *E) {
  return Success(E->getValue(), E);
}

bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
  return Success(E->getValue(), E);
}

bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
  return Success(E->getValue(), E);
}

bool VisitUnaryReal(const UnaryOperator *E);
bool VisitUnaryImag(const UnaryOperator *E);

bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E);
bool VisitSizeOfPackExpr(const SizeOfPackExpr *E);
bool VisitSourceLocExpr(const SourceLocExpr *E);
// FIXME: Missing: array subscript of vector, member of vector
9459};

9461class FixedPointExprEvaluator
  : public ExprEvaluatorBase<FixedPointExprEvaluator> {
APValue &Result;

public:
FixedPointExprEvaluator(EvalInfo &info, APValue &result)
    : ExprEvaluatorBaseTy(info), Result(result) {}

bool Success(const llvm::APInt &I, const Expr *E) {
  return Success(
      APFixedPoint(I, Info.Ctx.getFixedPointSemantics(E->getType())), E);
}

bool Success(uint64_t Value, const Expr *E) {
  return Success(
      APFixedPoint(Value, Info.Ctx.getFixedPointSemantics(E->getType())), E);
}

bool Success(const APValue &V, const Expr *E) {
  return Success(V.getFixedPoint(), E);
}

bool Success(const APFixedPoint &V, const Expr *E) {
  assert(E->getType()->isFixedPointType() && "Invalid evaluation result.")((E->getType()->isFixedPointType() && "Invalid evaluation result."
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9484, __PRETTY_FUNCTION__));
  assert(V.getWidth() == Info.Ctx.getIntWidth(E->getType()) &&((V.getWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9486, __PRETTY_FUNCTION__))
         "Invalid evaluation result.")((V.getWidth() == Info.Ctx.getIntWidth(E->getType()) &&
 "Invalid evaluation result.") ? static_cast<void> (0) :
 __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9486, __PRETTY_FUNCTION__));
  Result = APValue(V);
  return true;
}

//===--------------------------------------------------------------------===//
//                            Visitor Methods
//===--------------------------------------------------------------------===//

bool VisitFixedPointLiteral(const FixedPointLiteral *E) {
  return Success(E->getValue(), E);
}

bool VisitCastExpr(const CastExpr *E);
bool VisitUnaryOperator(const UnaryOperator *E);
bool VisitBinaryOperator(const BinaryOperator *E);
9502};
9503} // end anonymous namespace

9505/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and
9506/// produce either the integer value or a pointer.
9507///
9508/// GCC has a heinous extension which folds casts between pointer types and
9509/// pointer-sized integral types. We support this by allowing the evaluation of
9510/// an integer rvalue to produce a pointer (represented as an lvalue) instead.
9511/// Some simple arithmetic on such values is supported (they are treated much
9512/// like char*).
9513static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result,
                                  EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType())((E->isRValue() && E->getType()->isIntegralOrEnumerationType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9515, __PRETTY_FUNCTION__));
return IntExprEvaluator(Info, Result).Visit(E);
9517}

9519static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) {
APValue Val;
if (!EvaluateIntegerOrLValue(E, Val, Info))
  return false;
if (!Val.isInt()) {
  // FIXME: It would be better to produce the diagnostic for casting
  //        a pointer to an integer.
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
}
Result = Val.getInt();
return true;
9531}

9533bool IntExprEvaluator::VisitSourceLocExpr(const SourceLocExpr *E) {
APValue Evaluated = E->EvaluateInContext(
    Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr());
return Success(Evaluated, E);
9537}

9539static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result,
                             EvalInfo &Info) {
if (E->getType()->isFixedPointType()) {
  APValue Val;
  if (!FixedPointExprEvaluator(Info, Val).Visit(E))
    return false;
  if (!Val.isFixedPoint())
    return false;

  Result = Val.getFixedPoint();
  return true;
}
return false;
9552}

9554static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result,
                                      EvalInfo &Info) {
if (E->getType()->isIntegerType()) {
  auto FXSema = Info.Ctx.getFixedPointSemantics(E->getType());
  APSInt Val;
  if (!EvaluateInteger(E, Val, Info))
    return false;
  Result = APFixedPoint(Val, FXSema);
  return true;
} else if (E->getType()->isFixedPointType()) {
  return EvaluateFixedPoint(E, Result, Info);
}
return false;
9567}

9569/// Check whether the given declaration can be directly converted to an integral
9570/// rvalue. If not, no diagnostic is produced; there are other things we can
9571/// try.
9572bool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) {
// Enums are integer constant exprs.
if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) {
  // Check for signedness/width mismatches between E type and ECD value.
  bool SameSign = (ECD->getInitVal().isSigned()
                   == E->getType()->isSignedIntegerOrEnumerationType());
  bool SameWidth = (ECD->getInitVal().getBitWidth()
                    == Info.Ctx.getIntWidth(E->getType()));
  if (SameSign && SameWidth)
    return Success(ECD->getInitVal(), E);
  else {
    // Get rid of mismatch (otherwise Success assertions will fail)
    // by computing a new value matching the type of E.
    llvm::APSInt Val = ECD->getInitVal();
    if (!SameSign)
      Val.setIsSigned(!ECD->getInitVal().isSigned());
    if (!SameWidth)
      Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType()));
    return Success(Val, E);
  }
}
return false;
9594}

9596/// Values returned by __builtin_classify_type, chosen to match the values
9597/// produced by GCC's builtin.
9598enum class GCCTypeClass {
None = -1,
Void = 0,
Integer = 1,
// GCC reserves 2 for character types, but instead classifies them as
// integers.
Enum = 3,
Bool = 4,
Pointer = 5,
// GCC reserves 6 for references, but appears to never use it (because
// expressions never have reference type, presumably).
PointerToDataMember = 7,
RealFloat = 8,
Complex = 9,
// GCC reserves 10 for functions, but does not use it since GCC version 6 due
// to decay to pointer. (Prior to version 6 it was only used in C++ mode).
// GCC claims to reserve 11 for pointers to member functions, but *actually*
// uses 12 for that purpose, same as for a class or struct. Maybe it
// internally implements a pointer to member as a struct?  Who knows.
PointerToMemberFunction = 12, // Not a bug, see above.
ClassOrStruct = 12,
Union = 13,
// GCC reserves 14 for arrays, but does not use it since GCC version 6 due to
// decay to pointer. (Prior to version 6 it was only used in C++ mode).
// GCC reserves 15 for strings, but actually uses 5 (pointer) for string
// literals.
9624};

9626/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way
9627/// as GCC.
9628static GCCTypeClass
9629EvaluateBuiltinClassifyType(QualType T, const LangOptions &LangOpts) {
assert(!T->isDependentType() && "unexpected dependent type")((!T->isDependentType() && "unexpected dependent type"
) ? static_cast<void> (0) : __assert_fail ("!T->isDependentType() && \"unexpected dependent type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9630, __PRETTY_FUNCTION__));

QualType CanTy = T.getCanonicalType();
const BuiltinType *BT = dyn_cast<BuiltinType>(CanTy);

switch (CanTy->getTypeClass()) {
9636#define TYPE(ID, BASE)
9637#define DEPENDENT_TYPE(ID, BASE) case Type::ID:
9638#define NON_CANONICAL_TYPE(ID, BASE) case Type::ID:
9639#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(ID, BASE) case Type::ID:
9640#include "clang/AST/TypeNodes.inc"
case Type::Auto:
case Type::DeducedTemplateSpecialization:
    llvm_unreachable("unexpected non-canonical or dependent type")::llvm::llvm_unreachable_internal("unexpected non-canonical or dependent type"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9643);

case Type::Builtin:
  switch (BT->getKind()) {
9647#define BUILTIN_TYPE(ID, SINGLETON_ID)
9648#define SIGNED_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: return GCCTypeClass::Integer;
9650#define FLOATING_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: return GCCTypeClass::RealFloat;
9652#define PLACEHOLDER_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: break;
9654#include "clang/AST/BuiltinTypes.def"
  case BuiltinType::Void:
    return GCCTypeClass::Void;

  case BuiltinType::Bool:
    return GCCTypeClass::Bool;

  case BuiltinType::Char_U:
  case BuiltinType::UChar:
  case BuiltinType::WChar_U:
  case BuiltinType::Char8:
  case BuiltinType::Char16:
  case BuiltinType::Char32:
  case BuiltinType::UShort:
  case BuiltinType::UInt:
  case BuiltinType::ULong:
  case BuiltinType::ULongLong:
  case BuiltinType::UInt128:
    return GCCTypeClass::Integer;

  case BuiltinType::UShortAccum:
  case BuiltinType::UAccum:
  case BuiltinType::ULongAccum:
  case BuiltinType::UShortFract:
  case BuiltinType::UFract:
  case BuiltinType::ULongFract:
  case BuiltinType::SatUShortAccum:
  case BuiltinType::SatUAccum:
  case BuiltinType::SatULongAccum:
  case BuiltinType::SatUShortFract:
  case BuiltinType::SatUFract:
  case BuiltinType::SatULongFract:
    return GCCTypeClass::None;

  case BuiltinType::NullPtr:

  case BuiltinType::ObjCId:
  case BuiltinType::ObjCClass:
  case BuiltinType::ObjCSel:
9693#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
  case BuiltinType::Id:
9695#include "clang/Basic/OpenCLImageTypes.def"
9696#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
  case BuiltinType::Id:
9698#include "clang/Basic/OpenCLExtensionTypes.def"
  case BuiltinType::OCLSampler:
  case BuiltinType::OCLEvent:
  case BuiltinType::OCLClkEvent:
  case BuiltinType::OCLQueue:
  case BuiltinType::OCLReserveID:
9704#define SVE_TYPE(Name, Id, SingletonId) \
  case BuiltinType::Id:
9706#include "clang/Basic/AArch64SVEACLETypes.def"
    return GCCTypeClass::None;

  case BuiltinType::Dependent:
    llvm_unreachable("unexpected dependent type")::llvm::llvm_unreachable_internal("unexpected dependent type"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9710);
  };
  llvm_unreachable("unexpected placeholder type")::llvm::llvm_unreachable_internal("unexpected placeholder type"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9712);

case Type::Enum:
  return LangOpts.CPlusPlus ? GCCTypeClass::Enum : GCCTypeClass::Integer;

case Type::Pointer:
case Type::ConstantArray:
case Type::VariableArray:
case Type::IncompleteArray:
case Type::FunctionNoProto:
case Type::FunctionProto:
  return GCCTypeClass::Pointer;

case Type::MemberPointer:
  return CanTy->isMemberDataPointerType()
             ? GCCTypeClass::PointerToDataMember
             : GCCTypeClass::PointerToMemberFunction;

case Type::Complex:
  return GCCTypeClass::Complex;

case Type::Record:
  return CanTy->isUnionType() ? GCCTypeClass::Union
                              : GCCTypeClass::ClassOrStruct;

case Type::Atomic:
  // GCC classifies _Atomic T the same as T.
  return EvaluateBuiltinClassifyType(
      CanTy->castAs<AtomicType>()->getValueType(), LangOpts);

case Type::BlockPointer:
case Type::Vector:
case Type::ExtVector:
case Type::ObjCObject:
case Type::ObjCInterface:
case Type::ObjCObjectPointer:
case Type::Pipe:
  // GCC classifies vectors as None. We follow its lead and classify all
  // other types that don't fit into the regular classification the same way.
  return GCCTypeClass::None;

case Type::LValueReference:
case Type::RValueReference:
  llvm_unreachable("invalid type for expression")::llvm::llvm_unreachable_internal("invalid type for expression"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9755);
}

llvm_unreachable("unexpected type class")::llvm::llvm_unreachable_internal("unexpected type class", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9758);
9759}

9761/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way
9762/// as GCC.
9763static GCCTypeClass
9764EvaluateBuiltinClassifyType(const CallExpr *E, const LangOptions &LangOpts) {
// If no argument was supplied, default to None. This isn't
// ideal, however it is what gcc does.
if (E->getNumArgs() == 0)
  return GCCTypeClass::None;

// FIXME: Bizarrely, GCC treats a call with more than one argument as not
// being an ICE, but still folds it to a constant using the type of the first
// argument.
return EvaluateBuiltinClassifyType(E->getArg(0)->getType(), LangOpts);
9774}

9776/// EvaluateBuiltinConstantPForLValue - Determine the result of
9777/// __builtin_constant_p when applied to the given pointer.
9778///
9779/// A pointer is only "constant" if it is null (or a pointer cast to integer)
9780/// or it points to the first character of a string literal.
9781static bool EvaluateBuiltinConstantPForLValue(const APValue &LV) {
APValue::LValueBase Base = LV.getLValueBase();
if (Base.isNull()) {
  // A null base is acceptable.
  return true;
} else if (const Expr *E = Base.dyn_cast<const Expr *>()) {
  if (!isa<StringLiteral>(E))
    return false;
  return LV.getLValueOffset().isZero();
} else if (Base.is<TypeInfoLValue>()) {
  // Surprisingly, GCC considers __builtin_constant_p(&typeid(int)) to
  // evaluate to true.
  return true;
} else {
  // Any other base is not constant enough for GCC.
  return false;
}
9798}

9800/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to
9801/// GCC as we can manage.
9802static bool EvaluateBuiltinConstantP(EvalInfo &Info, const Expr *Arg) {
// This evaluation is not permitted to have side-effects, so evaluate it in
// a speculative evaluation context.
SpeculativeEvaluationRAII SpeculativeEval(Info);

// Constant-folding is always enabled for the operand of __builtin_constant_p
// (even when the enclosing evaluation context otherwise requires a strict
// language-specific constant expression).
FoldConstant Fold(Info, true);

QualType ArgType = Arg->getType();

// __builtin_constant_p always has one operand. The rules which gcc follows
// are not precisely documented, but are as follows:
//
//  - If the operand is of integral, floating, complex or enumeration type,
//    and can be folded to a known value of that type, it returns 1.
//  - If the operand can be folded to a pointer to the first character
//    of a string literal (or such a pointer cast to an integral type)
//    or to a null pointer or an integer cast to a pointer, it returns 1.
//
// Otherwise, it returns 0.
//
// FIXME: GCC also intends to return 1 for literals of aggregate types, but
// its support for this did not work prior to GCC 9 and is not yet well
// understood.
if (ArgType->isIntegralOrEnumerationType() || ArgType->isFloatingType() ||
    ArgType->isAnyComplexType() || ArgType->isPointerType() ||
    ArgType->isNullPtrType()) {
  APValue V;
  if (!::EvaluateAsRValue(Info, Arg, V)) {
    Fold.keepDiagnostics();
    return false;
  }

  // For a pointer (possibly cast to integer), there are special rules.
  if (V.getKind() == APValue::LValue)
    return EvaluateBuiltinConstantPForLValue(V);

  // Otherwise, any constant value is good enough.
  return V.hasValue();
}

// Anything else isn't considered to be sufficiently constant.
return false;
9847}

9849/// Retrieves the "underlying object type" of the given expression,
9850/// as used by __builtin_object_size.
9851static QualType getObjectType(APValue::LValueBase B) {
if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) {
  if (const VarDecl *VD = dyn_cast<VarDecl>(D))
    return VD->getType();
} else if (const Expr *E = B.get<const Expr*>()) {
  if (isa<CompoundLiteralExpr>(E))
    return E->getType();
} else if (B.is<TypeInfoLValue>()) {
  return B.getTypeInfoType();
} else if (B.is<DynamicAllocLValue>()) {
  return B.getDynamicAllocType();
}

return QualType();
9865}

9867/// A more selective version of E->IgnoreParenCasts for
9868/// tryEvaluateBuiltinObjectSize. This ignores some casts/parens that serve only
9869/// to change the type of E.
9870/// Ex. For E = `(short*)((char*)(&foo))`, returns `&foo`
9871///
9872/// Always returns an RValue with a pointer representation.
9873static const Expr *ignorePointerCastsAndParens(const Expr *E) {
assert(E->isRValue() && E->getType()->hasPointerRepresentation())((E->isRValue() && E->getType()->hasPointerRepresentation
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->hasPointerRepresentation()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9874, __PRETTY_FUNCTION__));

auto *NoParens = E->IgnoreParens();
auto *Cast = dyn_cast<CastExpr>(NoParens);
if (Cast == nullptr)
  return NoParens;

// We only conservatively allow a few kinds of casts, because this code is
// inherently a simple solution that seeks to support the common case.
auto CastKind = Cast->getCastKind();
if (CastKind != CK_NoOp && CastKind != CK_BitCast &&
    CastKind != CK_AddressSpaceConversion)
  return NoParens;

auto *SubExpr = Cast->getSubExpr();
if (!SubExpr->getType()->hasPointerRepresentation() || !SubExpr->isRValue())
  return NoParens;
return ignorePointerCastsAndParens(SubExpr);
9892}

9894/// Checks to see if the given LValue's Designator is at the end of the LValue's
9895/// record layout. e.g.
9896///   struct { struct { int a, b; } fst, snd; } obj;
9897///   obj.fst   // no
9898///   obj.snd   // yes
9899///   obj.fst.a // no
9900///   obj.fst.b // no
9901///   obj.snd.a // no
9902///   obj.snd.b // yes
9903///
9904/// Please note: this function is specialized for how __builtin_object_size
9905/// views "objects".
9906///
9907/// If this encounters an invalid RecordDecl or otherwise cannot determine the
9908/// correct result, it will always return true.
9909static bool isDesignatorAtObjectEnd(const ASTContext &Ctx, const LValue &LVal) {
assert(!LVal.Designator.Invalid)((!LVal.Designator.Invalid) ? static_cast<void> (0) : __assert_fail
 ("!LVal.Designator.Invalid", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9910, __PRETTY_FUNCTION__));

auto IsLastOrInvalidFieldDecl = [&Ctx](const FieldDecl *FD, bool &Invalid) {
  const RecordDecl *Parent = FD->getParent();
  Invalid = Parent->isInvalidDecl();
  if (Invalid || Parent->isUnion())
    return true;
  const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(Parent);
  return FD->getFieldIndex() + 1 == Layout.getFieldCount();
};

auto &Base = LVal.getLValueBase();
if (auto *ME = dyn_cast_or_null<MemberExpr>(Base.dyn_cast<const Expr *>())) {
  if (auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
    bool Invalid;
    if (!IsLastOrInvalidFieldDecl(FD, Invalid))
      return Invalid;
  } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(ME->getMemberDecl())) {
    for (auto *FD : IFD->chain()) {
      bool Invalid;
      if (!IsLastOrInvalidFieldDecl(cast<FieldDecl>(FD), Invalid))
        return Invalid;
    }
  }
}

unsigned I = 0;
QualType BaseType = getType(Base);
if (LVal.Designator.FirstEntryIsAnUnsizedArray) {
  // If we don't know the array bound, conservatively assume we're looking at
  // the final array element.
  ++I;
  if (BaseType->isIncompleteArrayType())
    BaseType = Ctx.getAsArrayType(BaseType)->getElementType();
  else
    BaseType = BaseType->castAs<PointerType>()->getPointeeType();
}

for (unsigned E = LVal.Designator.Entries.size(); I != E; ++I) {
  const auto &Entry = LVal.Designator.Entries[I];
  if (BaseType->isArrayType()) {
    // Because __builtin_object_size treats arrays as objects, we can ignore
    // the index iff this is the last array in the Designator.
    if (I + 1 == E)
      return true;
    const auto *CAT = cast<ConstantArrayType>(Ctx.getAsArrayType(BaseType));
    uint64_t Index = Entry.getAsArrayIndex();
    if (Index + 1 != CAT->getSize())
      return false;
    BaseType = CAT->getElementType();
  } else if (BaseType->isAnyComplexType()) {
    const auto *CT = BaseType->castAs<ComplexType>();
    uint64_t Index = Entry.getAsArrayIndex();
    if (Index != 1)
      return false;
    BaseType = CT->getElementType();
  } else if (auto *FD = getAsField(Entry)) {
    bool Invalid;
    if (!IsLastOrInvalidFieldDecl(FD, Invalid))
      return Invalid;
    BaseType = FD->getType();
  } else {
    assert(getAsBaseClass(Entry) && "Expecting cast to a base class")((getAsBaseClass(Entry) && "Expecting cast to a base class"
) ? static_cast<void> (0) : __assert_fail ("getAsBaseClass(Entry) && \"Expecting cast to a base class\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 9972, __PRETTY_FUNCTION__));
    return false;
  }
}
return true;
9977}

9979/// Tests to see if the LValue has a user-specified designator (that isn't
9980/// necessarily valid). Note that this always returns 'true' if the LValue has
9981/// an unsized array as its first designator entry, because there's currently no
9982/// way to tell if the user typed *foo or foo[0].
9983static bool refersToCompleteObject(const LValue &LVal) {
if (LVal.Designator.Invalid)
  return false;

if (!LVal.Designator.Entries.empty())
  return LVal.Designator.isMostDerivedAnUnsizedArray();

if (!LVal.InvalidBase)
  return true;

// If `E` is a MemberExpr, then the first part of the designator is hiding in
// the LValueBase.
const auto *E = LVal.Base.dyn_cast<const Expr *>();
return !E || !isa<MemberExpr>(E);
9997}

9999/// Attempts to detect a user writing into a piece of memory that's impossible
10000/// to figure out the size of by just using types.
10001static bool isUserWritingOffTheEnd(const ASTContext &Ctx, const LValue &LVal) {
const SubobjectDesignator &Designator = LVal.Designator;
// Notes:
// - Users can only write off of the end when we have an invalid base. Invalid
//   bases imply we don't know where the memory came from.
// - We used to be a bit more aggressive here; we'd only be conservative if
//   the array at the end was flexible, or if it had 0 or 1 elements. This
//   broke some common standard library extensions (PR30346), but was
//   otherwise seemingly fine. It may be useful to reintroduce this behavior
//   with some sort of whitelist. OTOH, it seems that GCC is always
//   conservative with the last element in structs (if it's an array), so our
//   current behavior is more compatible than a whitelisting approach would
//   be.
return LVal.InvalidBase &&
       Designator.Entries.size() == Designator.MostDerivedPathLength &&
       Designator.MostDerivedIsArrayElement &&
       isDesignatorAtObjectEnd(Ctx, LVal);
10018}

10020/// Converts the given APInt to CharUnits, assuming the APInt is unsigned.
10021/// Fails if the conversion would cause loss of precision.
10022static bool convertUnsignedAPIntToCharUnits(const llvm::APInt &Int,
                                          CharUnits &Result) {
auto CharUnitsMax = std::numeric_limits<CharUnits::QuantityType>::max();
if (Int.ugt(CharUnitsMax))
  return false;
Result = CharUnits::fromQuantity(Int.getZExtValue());
return true;
10029}

10031/// Helper for tryEvaluateBuiltinObjectSize -- Given an LValue, this will
10032/// determine how many bytes exist from the beginning of the object to either
10033/// the end of the current subobject, or the end of the object itself, depending
10034/// on what the LValue looks like + the value of Type.
10035///
10036/// If this returns false, the value of Result is undefined.
10037static bool determineEndOffset(EvalInfo &Info, SourceLocation ExprLoc,
                             unsigned Type, const LValue &LVal,
                             CharUnits &EndOffset) {
bool DetermineForCompleteObject = refersToCompleteObject(LVal);

auto CheckedHandleSizeof = [&](QualType Ty, CharUnits &Result) {
  if (Ty.isNull() || Ty->isIncompleteType() || Ty->isFunctionType())
    return false;
  return HandleSizeof(Info, ExprLoc, Ty, Result);
};

// We want to evaluate the size of the entire object. This is a valid fallback
// for when Type=1 and the designator is invalid, because we're asked for an
// upper-bound.
if (!(Type & 1) || LVal.Designator.Invalid || DetermineForCompleteObject) {
  // Type=3 wants a lower bound, so we can't fall back to this.
  if (Type == 3 && !DetermineForCompleteObject)
    return false;

  llvm::APInt APEndOffset;
  if (isBaseAnAllocSizeCall(LVal.getLValueBase()) &&
      getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset))
    return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset);

  if (LVal.InvalidBase)
    return false;

  QualType BaseTy = getObjectType(LVal.getLValueBase());
  return CheckedHandleSizeof(BaseTy, EndOffset);
}

// We want to evaluate the size of a subobject.
const SubobjectDesignator &Designator = LVal.Designator;

// The following is a moderately common idiom in C:
//
// struct Foo { int a; char c[1]; };
// struct Foo *F = (struct Foo *)malloc(sizeof(struct Foo) + strlen(Bar));
// strcpy(&F->c[0], Bar);
//
// In order to not break too much legacy code, we need to support it.
if (isUserWritingOffTheEnd(Info.Ctx, LVal)) {
  // If we can resolve this to an alloc_size call, we can hand that back,
  // because we know for certain how many bytes there are to write to.
  llvm::APInt APEndOffset;
  if (isBaseAnAllocSizeCall(LVal.getLValueBase()) &&
      getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset))
    return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset);

  // If we cannot determine the size of the initial allocation, then we can't
  // given an accurate upper-bound. However, we are still able to give
  // conservative lower-bounds for Type=3.
  if (Type == 1)
    return false;
}

CharUnits BytesPerElem;
if (!CheckedHandleSizeof(Designator.MostDerivedType, BytesPerElem))
  return false;

// According to the GCC documentation, we want the size of the subobject
// denoted by the pointer. But that's not quite right -- what we actually
// want is the size of the immediately-enclosing array, if there is one.
int64_t ElemsRemaining;
if (Designator.MostDerivedIsArrayElement &&
    Designator.Entries.size() == Designator.MostDerivedPathLength) {
  uint64_t ArraySize = Designator.getMostDerivedArraySize();
  uint64_t ArrayIndex = Designator.Entries.back().getAsArrayIndex();
  ElemsRemaining = ArraySize <= ArrayIndex ? 0 : ArraySize - ArrayIndex;
} else {
  ElemsRemaining = Designator.isOnePastTheEnd() ? 0 : 1;
}

EndOffset = LVal.getLValueOffset() + BytesPerElem * ElemsRemaining;
return true;
10112}

10114/// Tries to evaluate the __builtin_object_size for @p E. If successful,
10115/// returns true and stores the result in @p Size.
10116///
10117/// If @p WasError is non-null, this will report whether the failure to evaluate
10118/// is to be treated as an Error in IntExprEvaluator.
10119static bool tryEvaluateBuiltinObjectSize(const Expr *E, unsigned Type,
                                       EvalInfo &Info, uint64_t &Size) {
// Determine the denoted object.
LValue LVal;
{
  // The operand of __builtin_object_size is never evaluated for side-effects.
  // If there are any, but we can determine the pointed-to object anyway, then
  // ignore the side-effects.
  SpeculativeEvaluationRAII SpeculativeEval(Info);
  IgnoreSideEffectsRAII Fold(Info);

  if (E->isGLValue()) {
    // It's possible for us to be given GLValues if we're called via
    // Expr::tryEvaluateObjectSize.
    APValue RVal;
    if (!EvaluateAsRValue(Info, E, RVal))
      return false;
    LVal.setFrom(Info.Ctx, RVal);
  } else if (!EvaluatePointer(ignorePointerCastsAndParens(E), LVal, Info,
                              /*InvalidBaseOK=*/true))
    return false;
}

// If we point to before the start of the object, there are no accessible
// bytes.
if (LVal.getLValueOffset().isNegative()) {
  Size = 0;
  return true;
}

CharUnits EndOffset;
if (!determineEndOffset(Info, E->getExprLoc(), Type, LVal, EndOffset))
  return false;

// If we've fallen outside of the end offset, just pretend there's nothing to
// write to/read from.
if (EndOffset <= LVal.getLValueOffset())
  Size = 0;
else
  Size = (EndOffset - LVal.getLValueOffset()).getQuantity();
return true;
10160}

10162bool IntExprEvaluator::VisitConstantExpr(const ConstantExpr *E) {
llvm::SaveAndRestore<bool> InConstantContext(Info.InConstantContext, true);
if (E->getResultAPValueKind() != APValue::None)
  return Success(E->getAPValueResult(), E);
return ExprEvaluatorBaseTy::VisitConstantExpr(E);
10167}

10169bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (unsigned BuiltinOp = E->getBuiltinCallee())
  return VisitBuiltinCallExpr(E, BuiltinOp);

return ExprEvaluatorBaseTy::VisitCallExpr(E);
10174}

10176bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
                                          unsigned BuiltinOp) {
switch (unsigned BuiltinOp = E->getBuiltinCallee()) {
default:
  return ExprEvaluatorBaseTy::VisitCallExpr(E);

case Builtin::BI__builtin_dynamic_object_size:
case Builtin::BI__builtin_object_size: {
  // The type was checked when we built the expression.
  unsigned Type =
      E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue();
  assert(Type <= 3 && "unexpected type")((Type <= 3 && "unexpected type") ? static_cast<
void> (0) : __assert_fail ("Type <= 3 && \"unexpected type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10187, __PRETTY_FUNCTION__));

  uint64_t Size;
  if (tryEvaluateBuiltinObjectSize(E->getArg(0), Type, Info, Size))
    return Success(Size, E);

  if (E->getArg(0)->HasSideEffects(Info.Ctx))
    return Success((Type & 2) ? 0 : -1, E);

  // Expression had no side effects, but we couldn't statically determine the
  // size of the referenced object.
  switch (Info.EvalMode) {
  case EvalInfo::EM_ConstantExpression:
  case EvalInfo::EM_ConstantFold:
  case EvalInfo::EM_IgnoreSideEffects:
    // Leave it to IR generation.
    return Error(E);
  case EvalInfo::EM_ConstantExpressionUnevaluated:
    // Reduce it to a constant now.
    return Success((Type & 2) ? 0 : -1, E);
  }

  llvm_unreachable("unexpected EvalMode")::llvm::llvm_unreachable_internal("unexpected EvalMode", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10209);
}

case Builtin::BI__builtin_os_log_format_buffer_size: {
  analyze_os_log::OSLogBufferLayout Layout;
  analyze_os_log::computeOSLogBufferLayout(Info.Ctx, E, Layout);
  return Success(Layout.size().getQuantity(), E);
}

case Builtin::BI__builtin_bswap16:
case Builtin::BI__builtin_bswap32:
case Builtin::BI__builtin_bswap64: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  return Success(Val.byteSwap(), E);
}

case Builtin::BI__builtin_classify_type:
  return Success((int)EvaluateBuiltinClassifyType(E, Info.getLangOpts()), E);

case Builtin::BI__builtin_clrsb:
case Builtin::BI__builtin_clrsbl:
case Builtin::BI__builtin_clrsbll: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  return Success(Val.getBitWidth() - Val.getMinSignedBits(), E);
}

case Builtin::BI__builtin_clz:
case Builtin::BI__builtin_clzl:
case Builtin::BI__builtin_clzll:
case Builtin::BI__builtin_clzs: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;
  if (!Val)
    return Error(E);

  return Success(Val.countLeadingZeros(), E);
}

case Builtin::BI__builtin_constant_p: {
  const Expr *Arg = E->getArg(0);
  if (EvaluateBuiltinConstantP(Info, Arg))
    return Success(true, E);
  if (Info.InConstantContext || Arg->HasSideEffects(Info.Ctx)) {
    // Outside a constant context, eagerly evaluate to false in the presence
    // of side-effects in order to avoid -Wunsequenced false-positives in
    // a branch on __builtin_constant_p(expr).
    return Success(false, E);
  }
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

case Builtin::BI__builtin_is_constant_evaluated:
  return Success(Info.InConstantContext, E);

case Builtin::BI__builtin_ctz:
case Builtin::BI__builtin_ctzl:
case Builtin::BI__builtin_ctzll:
case Builtin::BI__builtin_ctzs: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;
  if (!Val)
    return Error(E);

  return Success(Val.countTrailingZeros(), E);
}

case Builtin::BI__builtin_eh_return_data_regno: {
  int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue();
  Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand);
  return Success(Operand, E);
}

case Builtin::BI__builtin_expect:
  return Visit(E->getArg(0));

case Builtin::BI__builtin_ffs:
case Builtin::BI__builtin_ffsl:
case Builtin::BI__builtin_ffsll: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  unsigned N = Val.countTrailingZeros();
  return Success(N == Val.getBitWidth() ? 0 : N + 1, E);
}

case Builtin::BI__builtin_fpclassify: {
  APFloat Val(0.0);
  if (!EvaluateFloat(E->getArg(5), Val, Info))
    return false;
  unsigned Arg;
  switch (Val.getCategory()) {
  case APFloat::fcNaN: Arg = 0; break;
  case APFloat::fcInfinity: Arg = 1; break;
  case APFloat::fcNormal: Arg = Val.isDenormal() ? 3 : 2; break;
  case APFloat::fcZero: Arg = 4; break;
  }
  return Visit(E->getArg(Arg));
}

case Builtin::BI__builtin_isinf_sign: {
  APFloat Val(0.0);
  return EvaluateFloat(E->getArg(0), Val, Info) &&
         Success(Val.isInfinity() ? (Val.isNegative() ? -1 : 1) : 0, E);
}

case Builtin::BI__builtin_isinf: {
  APFloat Val(0.0);
  return EvaluateFloat(E->getArg(0), Val, Info) &&
         Success(Val.isInfinity() ? 1 : 0, E);
}

case Builtin::BI__builtin_isfinite: {
  APFloat Val(0.0);
  return EvaluateFloat(E->getArg(0), Val, Info) &&
         Success(Val.isFinite() ? 1 : 0, E);
}

case Builtin::BI__builtin_isnan: {
  APFloat Val(0.0);
  return EvaluateFloat(E->getArg(0), Val, Info) &&
         Success(Val.isNaN() ? 1 : 0, E);
}

case Builtin::BI__builtin_isnormal: {
  APFloat Val(0.0);
  return EvaluateFloat(E->getArg(0), Val, Info) &&
         Success(Val.isNormal() ? 1 : 0, E);
}

case Builtin::BI__builtin_parity:
case Builtin::BI__builtin_parityl:
case Builtin::BI__builtin_parityll: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  return Success(Val.countPopulation() % 2, E);
}

case Builtin::BI__builtin_popcount:
case Builtin::BI__builtin_popcountl:
case Builtin::BI__builtin_popcountll: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  return Success(Val.countPopulation(), E);
}

case Builtin::BIstrlen:
case Builtin::BIwcslen:
  // A call to strlen is not a constant expression.
  if (Info.getLangOpts().CPlusPlus11)
    Info.CCEDiag(E, diag::note_constexpr_invalid_function)
      << /*isConstexpr*/0 << /*isConstructor*/0
      << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'");
  else
    Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_strlen:
case Builtin::BI__builtin_wcslen: {
  // As an extension, we support __builtin_strlen() as a constant expression,
  // and support folding strlen() to a constant.
  LValue String;
  if (!EvaluatePointer(E->getArg(0), String, Info))
    return false;

  QualType CharTy = E->getArg(0)->getType()->getPointeeType();

  // Fast path: if it's a string literal, search the string value.
  if (const StringLiteral *S = dyn_cast_or_null<StringLiteral>(
          String.getLValueBase().dyn_cast<const Expr *>())) {
    // The string literal may have embedded null characters. Find the first
    // one and truncate there.
    StringRef Str = S->getBytes();
    int64_t Off = String.Offset.getQuantity();
    if (Off >= 0 && (uint64_t)Off <= (uint64_t)Str.size() &&
        S->getCharByteWidth() == 1 &&
        // FIXME: Add fast-path for wchar_t too.
        Info.Ctx.hasSameUnqualifiedType(CharTy, Info.Ctx.CharTy)) {
      Str = Str.substr(Off);

      StringRef::size_type Pos = Str.find(0);
      if (Pos != StringRef::npos)
        Str = Str.substr(0, Pos);

      return Success(Str.size(), E);
    }

    // Fall through to slow path to issue appropriate diagnostic.
  }

  // Slow path: scan the bytes of the string looking for the terminating 0.
  for (uint64_t Strlen = 0; /**/; ++Strlen) {
    APValue Char;
    if (!handleLValueToRValueConversion(Info, E, CharTy, String, Char) ||
        !Char.isInt())
      return false;
    if (!Char.getInt())
      return Success(Strlen, E);
    if (!HandleLValueArrayAdjustment(Info, E, String, CharTy, 1))
      return false;
  }
}

case Builtin::BIstrcmp:
case Builtin::BIwcscmp:
case Builtin::BIstrncmp:
case Builtin::BIwcsncmp:
case Builtin::BImemcmp:
case Builtin::BIbcmp:
case Builtin::BIwmemcmp:
  // A call to strlen is not a constant expression.
  if (Info.getLangOpts().CPlusPlus11)
    Info.CCEDiag(E, diag::note_constexpr_invalid_function)
      << /*isConstexpr*/0 << /*isConstructor*/0
      << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'");
  else
    Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr);
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Builtin::BI__builtin_strcmp:
case Builtin::BI__builtin_wcscmp:
case Builtin::BI__builtin_strncmp:
case Builtin::BI__builtin_wcsncmp:
case Builtin::BI__builtin_memcmp:
case Builtin::BI__builtin_bcmp:
case Builtin::BI__builtin_wmemcmp: {
  LValue String1, String2;
  if (!EvaluatePointer(E->getArg(0), String1, Info) ||
      !EvaluatePointer(E->getArg(1), String2, Info))
    return false;

  uint64_t MaxLength = uint64_t(-1);
  if (BuiltinOp != Builtin::BIstrcmp &&
      BuiltinOp != Builtin::BIwcscmp &&
      BuiltinOp != Builtin::BI__builtin_strcmp &&
      BuiltinOp != Builtin::BI__builtin_wcscmp) {
    APSInt N;
    if (!EvaluateInteger(E->getArg(2), N, Info))
      return false;
    MaxLength = N.getExtValue();
  }

  // Empty substrings compare equal by definition.
  if (MaxLength == 0u)
    return Success(0, E);

  if (!String1.checkNullPointerForFoldAccess(Info, E, AK_Read) ||
      !String2.checkNullPointerForFoldAccess(Info, E, AK_Read) ||
      String1.Designator.Invalid || String2.Designator.Invalid)
    return false;

  QualType CharTy1 = String1.Designator.getType(Info.Ctx);
  QualType CharTy2 = String2.Designator.getType(Info.Ctx);

  bool IsRawByte = BuiltinOp == Builtin::BImemcmp ||
                   BuiltinOp == Builtin::BIbcmp ||
                   BuiltinOp == Builtin::BI__builtin_memcmp ||
                   BuiltinOp == Builtin::BI__builtin_bcmp;

  assert(IsRawByte ||((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->
getArg(0)->getType()->getPointeeType()) && Info
.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast
<void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10482, __PRETTY_FUNCTION__))
         (Info.Ctx.hasSameUnqualifiedType(((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->
getArg(0)->getType()->getPointeeType()) && Info
.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast
<void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10482, __PRETTY_FUNCTION__))
              CharTy1, E->getArg(0)->getType()->getPointeeType()) &&((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->
getArg(0)->getType()->getPointeeType()) && Info
.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast
<void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10482, __PRETTY_FUNCTION__))
          Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2)))((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->
getArg(0)->getType()->getPointeeType()) && Info
.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast
<void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10482, __PRETTY_FUNCTION__));

  const auto &ReadCurElems = [&](APValue &Char1, APValue &Char2) {
    return handleLValueToRValueConversion(Info, E, CharTy1, String1, Char1) &&
           handleLValueToRValueConversion(Info, E, CharTy2, String2, Char2) &&
           Char1.isInt() && Char2.isInt();
  };
  const auto &AdvanceElems = [&] {
    return HandleLValueArrayAdjustment(Info, E, String1, CharTy1, 1) &&
           HandleLValueArrayAdjustment(Info, E, String2, CharTy2, 1);
  };

  if (IsRawByte) {
    uint64_t BytesRemaining = MaxLength;
    // Pointers to const void may point to objects of incomplete type.
    if (CharTy1->isIncompleteType()) {
      Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy1;
      return false;
    }
    if (CharTy2->isIncompleteType()) {
      Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy2;
      return false;
    }
    uint64_t CharTy1Width{Info.Ctx.getTypeSize(CharTy1)};
    CharUnits CharTy1Size = Info.Ctx.toCharUnitsFromBits(CharTy1Width);
    // Give up on comparing between elements with disparate widths.
    if (CharTy1Size != Info.Ctx.getTypeSizeInChars(CharTy2))
      return false;
    uint64_t BytesPerElement = CharTy1Size.getQuantity();
    assert(BytesRemaining && "BytesRemaining should not be zero: the "((BytesRemaining && "BytesRemaining should not be zero: the "
 "following loop considers at least one element") ? static_cast
<void> (0) : __assert_fail ("BytesRemaining && \"BytesRemaining should not be zero: the \" \"following loop considers at least one element\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10512, __PRETTY_FUNCTION__))
                             "following loop considers at least one element")((BytesRemaining && "BytesRemaining should not be zero: the "
 "following loop considers at least one element") ? static_cast
<void> (0) : __assert_fail ("BytesRemaining && \"BytesRemaining should not be zero: the \" \"following loop considers at least one element\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10512, __PRETTY_FUNCTION__));
    while (true) {
      APValue Char1, Char2;
      if (!ReadCurElems(Char1, Char2))
        return false;
      // We have compatible in-memory widths, but a possible type and
      // (for `bool`) internal representation mismatch.
      // Assuming two's complement representation, including 0 for `false` and
      // 1 for `true`, we can check an appropriate number of elements for
      // equality even if they are not byte-sized.
      APSInt Char1InMem = Char1.getInt().extOrTrunc(CharTy1Width);
      APSInt Char2InMem = Char2.getInt().extOrTrunc(CharTy1Width);
      if (Char1InMem.ne(Char2InMem)) {
        // If the elements are byte-sized, then we can produce a three-way
        // comparison result in a straightforward manner.
        if (BytesPerElement == 1u) {
          // memcmp always compares unsigned chars.
          return Success(Char1InMem.ult(Char2InMem) ? -1 : 1, E);
        }
        // The result is byte-order sensitive, and we have multibyte elements.
        // FIXME: We can compare the remaining bytes in the correct order.
        return false;
      }
      if (!AdvanceElems())
        return false;
      if (BytesRemaining <= BytesPerElement)
        break;
      BytesRemaining -= BytesPerElement;
    }
    // Enough elements are equal to account for the memcmp limit.
    return Success(0, E);
  }

  bool StopAtNull =
      (BuiltinOp != Builtin::BImemcmp && BuiltinOp != Builtin::BIbcmp &&
       BuiltinOp != Builtin::BIwmemcmp &&
       BuiltinOp != Builtin::BI__builtin_memcmp &&
       BuiltinOp != Builtin::BI__builtin_bcmp &&
       BuiltinOp != Builtin::BI__builtin_wmemcmp);
  bool IsWide = BuiltinOp == Builtin::BIwcscmp ||
                BuiltinOp == Builtin::BIwcsncmp ||
                BuiltinOp == Builtin::BIwmemcmp ||
                BuiltinOp == Builtin::BI__builtin_wcscmp ||
                BuiltinOp == Builtin::BI__builtin_wcsncmp ||
                BuiltinOp == Builtin::BI__builtin_wmemcmp;

  for (; MaxLength; --MaxLength) {
    APValue Char1, Char2;
    if (!ReadCurElems(Char1, Char2))
      return false;
    if (Char1.getInt() != Char2.getInt()) {
      if (IsWide) // wmemcmp compares with wchar_t signedness.
        return Success(Char1.getInt() < Char2.getInt() ? -1 : 1, E);
      // memcmp always compares unsigned chars.
      return Success(Char1.getInt().ult(Char2.getInt()) ? -1 : 1, E);
    }
    if (StopAtNull && !Char1.getInt())
      return Success(0, E);
    assert(!(StopAtNull && !Char2.getInt()))((!(StopAtNull && !Char2.getInt())) ? static_cast<
void> (0) : __assert_fail ("!(StopAtNull && !Char2.getInt())"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10570, __PRETTY_FUNCTION__));
    if (!AdvanceElems())
      return false;
  }
  // We hit the strncmp / memcmp limit.
  return Success(0, E);
}

case Builtin::BI__atomic_always_lock_free:
case Builtin::BI__atomic_is_lock_free:
case Builtin::BI__c11_atomic_is_lock_free: {
  APSInt SizeVal;
  if (!EvaluateInteger(E->getArg(0), SizeVal, Info))
    return false;

  // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power
  // of two less than the maximum inline atomic width, we know it is
  // lock-free.  If the size isn't a power of two, or greater than the
  // maximum alignment where we promote atomics, we know it is not lock-free
  // (at least not in the sense of atomic_is_lock_free).  Otherwise,
  // the answer can only be determined at runtime; for example, 16-byte
  // atomics have lock-free implementations on some, but not all,
  // x86-64 processors.

  // Check power-of-two.
  CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue());
  if (Size.isPowerOfTwo()) {
    // Check against inlining width.
    unsigned InlineWidthBits =
        Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth();
    if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) {
      if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free ||
          Size == CharUnits::One() ||
          E->getArg(1)->isNullPointerConstant(Info.Ctx,
                                              Expr::NPC_NeverValueDependent))
        // OK, we will inline appropriately-aligned operations of this size,
        // and _Atomic(T) is appropriately-aligned.
        return Success(1, E);

      QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()->
        castAs<PointerType>()->getPointeeType();
      if (!PointeeType->isIncompleteType() &&
          Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) {
        // OK, we will inline operations on this object.
        return Success(1, E);
      }
    }
  }

  return BuiltinOp == Builtin::BI__atomic_always_lock_free ?
      Success(0, E) : Error(E);
}
case Builtin::BIomp_is_initial_device:
  // We can decide statically which value the runtime would return if called.
  return Success(Info.getLangOpts().OpenMPIsDevice ? 0 : 1, E);
case Builtin::BI__builtin_add_overflow:
case Builtin::BI__builtin_sub_overflow:
case Builtin::BI__builtin_mul_overflow:
case Builtin::BI__builtin_sadd_overflow:
case Builtin::BI__builtin_uadd_overflow:
case Builtin::BI__builtin_uaddl_overflow:
case Builtin::BI__builtin_uaddll_overflow:
case Builtin::BI__builtin_usub_overflow:
case Builtin::BI__builtin_usubl_overflow:
case Builtin::BI__builtin_usubll_overflow:
case Builtin::BI__builtin_umul_overflow:
case Builtin::BI__builtin_umull_overflow:
case Builtin::BI__builtin_umulll_overflow:
case Builtin::BI__builtin_saddl_overflow:
case Builtin::BI__builtin_saddll_overflow:
case Builtin::BI__builtin_ssub_overflow:
case Builtin::BI__builtin_ssubl_overflow:
case Builtin::BI__builtin_ssubll_overflow:
case Builtin::BI__builtin_smul_overflow:
case Builtin::BI__builtin_smull_overflow:
case Builtin::BI__builtin_smulll_overflow: {
  LValue ResultLValue;
  APSInt LHS, RHS;

  QualType ResultType = E->getArg(2)->getType()->getPointeeType();
  if (!EvaluateInteger(E->getArg(0), LHS, Info) ||
      !EvaluateInteger(E->getArg(1), RHS, Info) ||
      !EvaluatePointer(E->getArg(2), ResultLValue, Info))
    return false;

  APSInt Result;
  bool DidOverflow = false;

  // If the types don't have to match, enlarge all 3 to the largest of them.
  if (BuiltinOp == Builtin::BI__builtin_add_overflow ||
      BuiltinOp == Builtin::BI__builtin_sub_overflow ||
      BuiltinOp == Builtin::BI__builtin_mul_overflow) {
    bool IsSigned = LHS.isSigned() || RHS.isSigned() ||
                    ResultType->isSignedIntegerOrEnumerationType();
    bool AllSigned = LHS.isSigned() && RHS.isSigned() &&
                    ResultType->isSignedIntegerOrEnumerationType();
    uint64_t LHSSize = LHS.getBitWidth();
    uint64_t RHSSize = RHS.getBitWidth();
    uint64_t ResultSize = Info.Ctx.getTypeSize(ResultType);
    uint64_t MaxBits = std::max(std::max(LHSSize, RHSSize), ResultSize);

    // Add an additional bit if the signedness isn't uniformly agreed to. We
    // could do this ONLY if there is a signed and an unsigned that both have
    // MaxBits, but the code to check that is pretty nasty.  The issue will be
    // caught in the shrink-to-result later anyway.
    if (IsSigned && !AllSigned)
      ++MaxBits;

    LHS = APSInt(LHS.extOrTrunc(MaxBits), !IsSigned);
    RHS = APSInt(RHS.extOrTrunc(MaxBits), !IsSigned);
    Result = APSInt(MaxBits, !IsSigned);
  }

  // Find largest int.
  switch (BuiltinOp) {
  default:
    llvm_unreachable("Invalid value for BuiltinOp")::llvm::llvm_unreachable_internal("Invalid value for BuiltinOp"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10686);
  case Builtin::BI__builtin_add_overflow:
  case Builtin::BI__builtin_sadd_overflow:
  case Builtin::BI__builtin_saddl_overflow:
  case Builtin::BI__builtin_saddll_overflow:
  case Builtin::BI__builtin_uadd_overflow:
  case Builtin::BI__builtin_uaddl_overflow:
  case Builtin::BI__builtin_uaddll_overflow:
    Result = LHS.isSigned() ? LHS.sadd_ov(RHS, DidOverflow)
                            : LHS.uadd_ov(RHS, DidOverflow);
    break;
  case Builtin::BI__builtin_sub_overflow:
  case Builtin::BI__builtin_ssub_overflow:
  case Builtin::BI__builtin_ssubl_overflow:
  case Builtin::BI__builtin_ssubll_overflow:
  case Builtin::BI__builtin_usub_overflow:
  case Builtin::BI__builtin_usubl_overflow:
  case Builtin::BI__builtin_usubll_overflow:
    Result = LHS.isSigned() ? LHS.ssub_ov(RHS, DidOverflow)
                            : LHS.usub_ov(RHS, DidOverflow);
    break;
  case Builtin::BI__builtin_mul_overflow:
  case Builtin::BI__builtin_smul_overflow:
  case Builtin::BI__builtin_smull_overflow:
  case Builtin::BI__builtin_smulll_overflow:
  case Builtin::BI__builtin_umul_overflow:
  case Builtin::BI__builtin_umull_overflow:
  case Builtin::BI__builtin_umulll_overflow:
    Result = LHS.isSigned() ? LHS.smul_ov(RHS, DidOverflow)
                            : LHS.umul_ov(RHS, DidOverflow);
    break;
  }

  // In the case where multiple sizes are allowed, truncate and see if
  // the values are the same.
  if (BuiltinOp == Builtin::BI__builtin_add_overflow ||
      BuiltinOp == Builtin::BI__builtin_sub_overflow ||
      BuiltinOp == Builtin::BI__builtin_mul_overflow) {
    // APSInt doesn't have a TruncOrSelf, so we use extOrTrunc instead,
    // since it will give us the behavior of a TruncOrSelf in the case where
    // its parameter <= its size.  We previously set Result to be at least the
    // type-size of the result, so getTypeSize(ResultType) <= Result.BitWidth
    // will work exactly like TruncOrSelf.
    APSInt Temp = Result.extOrTrunc(Info.Ctx.getTypeSize(ResultType));
    Temp.setIsSigned(ResultType->isSignedIntegerOrEnumerationType());

    if (!APSInt::isSameValue(Temp, Result))
      DidOverflow = true;
    Result = Temp;
  }

  APValue APV{Result};
  if (!handleAssignment(Info, E, ResultLValue, ResultType, APV))
    return false;
  return Success(DidOverflow, E);
}
}
10743}

10745/// Determine whether this is a pointer past the end of the complete
10746/// object referred to by the lvalue.
10747static bool isOnePastTheEndOfCompleteObject(const ASTContext &Ctx,
                                          const LValue &LV) {
// A null pointer can be viewed as being "past the end" but we don't
// choose to look at it that way here.
if (!LV.getLValueBase())
  return false;

// If the designator is valid and refers to a subobject, we're not pointing
// past the end.
if (!LV.getLValueDesignator().Invalid &&
    !LV.getLValueDesignator().isOnePastTheEnd())
  return false;

// A pointer to an incomplete type might be past-the-end if the type's size is
// zero.  We cannot tell because the type is incomplete.
QualType Ty = getType(LV.getLValueBase());
if (Ty->isIncompleteType())
  return true;

// We're a past-the-end pointer if we point to the byte after the object,
// no matter what our type or path is.
auto Size = Ctx.getTypeSizeInChars(Ty);
return LV.getLValueOffset() == Size;
10770}

10772namespace {

10774/// Data recursive integer evaluator of certain binary operators.
10775///
10776/// We use a data recursive algorithm for binary operators so that we are able
10777/// to handle extreme cases of chained binary operators without causing stack
10778/// overflow.
10779class DataRecursiveIntBinOpEvaluator {
struct EvalResult {
  APValue Val;
  bool Failed;

  EvalResult() : Failed(false) { }

  void swap(EvalResult &RHS) {
    Val.swap(RHS.Val);
    Failed = RHS.Failed;
    RHS.Failed = false;
  }
};

struct Job {
  const Expr *E;
  EvalResult LHSResult; // meaningful only for binary operator expression.
  enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind;

  Job() = default;
  Job(Job &&) = default;

  void startSpeculativeEval(EvalInfo &Info) {
    SpecEvalRAII = SpeculativeEvaluationRAII(Info);
  }

private:
  SpeculativeEvaluationRAII SpecEvalRAII;
};

SmallVector<Job, 16> Queue;

IntExprEvaluator &IntEval;
EvalInfo &Info;
APValue &FinalResult;

10815public:
DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result)
  : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { }

/// True if \param E is a binary operator that we are going to handle
/// data recursively.
/// We handle binary operators that are comma, logical, or that have operands
/// with integral or enumeration type.
static bool shouldEnqueue(const BinaryOperator *E) {
  return E->getOpcode() == BO_Comma || E->isLogicalOp() ||
3
←
Returning zero, which participates in a condition later→
         (E->isRValue() && E->getType()->isIntegralOrEnumerationType() &&
          E->getLHS()->getType()->isIntegralOrEnumerationType() &&
          E->getRHS()->getType()->isIntegralOrEnumerationType());
}

bool Traverse(const BinaryOperator *E) {
  enqueue(E);
  EvalResult PrevResult;
  while (!Queue.empty())
    process(PrevResult);

  if (PrevResult.Failed) return false;

  FinalResult.swap(PrevResult.Val);
  return true;
}

10842private:
bool Success(uint64_t Value, const Expr *E, APValue &Result) {
  return IntEval.Success(Value, E, Result);
}
bool Success(const APSInt &Value, const Expr *E, APValue &Result) {
  return IntEval.Success(Value, E, Result);
}
bool Error(const Expr *E) {
  return IntEval.Error(E);
}
bool Error(const Expr *E, diag::kind D) {
  return IntEval.Error(E, D);
}

OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) {
  return Info.CCEDiag(E, D);
}

// Returns true if visiting the RHS is necessary, false otherwise.
bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E,
                       bool &SuppressRHSDiags);

bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult,
                const BinaryOperator *E, APValue &Result);

void EvaluateExpr(const Expr *E, EvalResult &Result) {
  Result.Failed = !Evaluate(Result.Val, Info, E);
  if (Result.Failed)
    Result.Val = APValue();
}

void process(EvalResult &Result);

void enqueue(const Expr *E) {
  E = E->IgnoreParens();
  Queue.resize(Queue.size()+1);
  Queue.back().E = E;
  Queue.back().Kind = Job::AnyExprKind;
}
10881};

10883}

10885bool DataRecursiveIntBinOpEvaluator::
     VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E,
                       bool &SuppressRHSDiags) {
if (E->getOpcode() == BO_Comma) {
  // Ignore LHS but note if we could not evaluate it.
  if (LHSResult.Failed)
    return Info.noteSideEffect();
  return true;
}

if (E->isLogicalOp()) {
  bool LHSAsBool;
  if (!LHSResult.Failed && HandleConversionToBool(LHSResult.Val, LHSAsBool)) {
    // We were able to evaluate the LHS, see if we can get away with not
    // evaluating the RHS: 0 && X -> 0, 1 || X -> 1
    if (LHSAsBool == (E->getOpcode() == BO_LOr)) {
      Success(LHSAsBool, E, LHSResult.Val);
      return false; // Ignore RHS
    }
  } else {
    LHSResult.Failed = true;

    // Since we weren't able to evaluate the left hand side, it
    // might have had side effects.
    if (!Info.noteSideEffect())
      return false;

    // We can't evaluate the LHS; however, sometimes the result
    // is determined by the RHS: X && 0 -> 0, X || 1 -> 1.
    // Don't ignore RHS and suppress diagnostics from this arm.
    SuppressRHSDiags = true;
  }

  return true;
}

assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&((E->getLHS()->getType()->isIntegralOrEnumerationType
() && E->getRHS()->getType()->isIntegralOrEnumerationType
()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10922, __PRETTY_FUNCTION__))
       E->getRHS()->getType()->isIntegralOrEnumerationType())((E->getLHS()->getType()->isIntegralOrEnumerationType
() && E->getRHS()->getType()->isIntegralOrEnumerationType
()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10922, __PRETTY_FUNCTION__));

if (LHSResult.Failed && !Info.noteFailure())
  return false; // Ignore RHS;

return true;
10928}

10930static void addOrSubLValueAsInteger(APValue &LVal, const APSInt &Index,
                                  bool IsSub) {
// Compute the new offset in the appropriate width, wrapping at 64 bits.
// FIXME: When compiling for a 32-bit target, we should use 32-bit
// offsets.
assert(!LVal.hasLValuePath() && "have designator for integer lvalue")((!LVal.hasLValuePath() && "have designator for integer lvalue"
) ? static_cast<void> (0) : __assert_fail ("!LVal.hasLValuePath() && \"have designator for integer lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10935, __PRETTY_FUNCTION__));
CharUnits &Offset = LVal.getLValueOffset();
uint64_t Offset64 = Offset.getQuantity();
uint64_t Index64 = Index.extOrTrunc(64).getZExtValue();
Offset = CharUnits::fromQuantity(IsSub ? Offset64 - Index64
                                       : Offset64 + Index64);
10941}

10943bool DataRecursiveIntBinOpEvaluator::
     VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult,
                const BinaryOperator *E, APValue &Result) {
if (E->getOpcode() == BO_Comma) {
  if (RHSResult.Failed)
    return false;
  Result = RHSResult.Val;
  return true;
}

if (E->isLogicalOp()) {
  bool lhsResult, rhsResult;
  bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult);
  bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult);

  if (LHSIsOK) {
    if (RHSIsOK) {
      if (E->getOpcode() == BO_LOr)
        return Success(lhsResult || rhsResult, E, Result);
      else
        return Success(lhsResult && rhsResult, E, Result);
    }
  } else {
    if (RHSIsOK) {
      // We can't evaluate the LHS; however, sometimes the result
      // is determined by the RHS: X && 0 -> 0, X || 1 -> 1.
      if (rhsResult == (E->getOpcode() == BO_LOr))
        return Success(rhsResult, E, Result);
    }
  }

  return false;
}

assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&((E->getLHS()->getType()->isIntegralOrEnumerationType
() && E->getRHS()->getType()->isIntegralOrEnumerationType
()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10978, __PRETTY_FUNCTION__))
       E->getRHS()->getType()->isIntegralOrEnumerationType())((E->getLHS()->getType()->isIntegralOrEnumerationType
() && E->getRHS()->getType()->isIntegralOrEnumerationType
()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 10978, __PRETTY_FUNCTION__));

if (LHSResult.Failed || RHSResult.Failed)
  return false;

const APValue &LHSVal = LHSResult.Val;
const APValue &RHSVal = RHSResult.Val;

// Handle cases like (unsigned long)&a + 4.
if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) {
  Result = LHSVal;
  addOrSubLValueAsInteger(Result, RHSVal.getInt(), E->getOpcode() == BO_Sub);
  return true;
}

// Handle cases like 4 + (unsigned long)&a
if (E->getOpcode() == BO_Add &&
    RHSVal.isLValue() && LHSVal.isInt()) {
  Result = RHSVal;
  addOrSubLValueAsInteger(Result, LHSVal.getInt(), /*IsSub*/false);
  return true;
}

if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) {
  // Handle (intptr_t)&&A - (intptr_t)&&B.
  if (!LHSVal.getLValueOffset().isZero() ||
      !RHSVal.getLValueOffset().isZero())
    return false;
  const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>();
  const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>();
  if (!LHSExpr || !RHSExpr)
    return false;
  const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr);
  const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr);
  if (!LHSAddrExpr || !RHSAddrExpr)
    return false;
  // Make sure both labels come from the same function.
  if (LHSAddrExpr->getLabel()->getDeclContext() !=
      RHSAddrExpr->getLabel()->getDeclContext())
    return false;
  Result = APValue(LHSAddrExpr, RHSAddrExpr);
  return true;
}

// All the remaining cases expect both operands to be an integer
if (!LHSVal.isInt() || !RHSVal.isInt())
  return Error(E);

// Set up the width and signedness manually, in case it can't be deduced
// from the operation we're performing.
// FIXME: Don't do this in the cases where we can deduce it.
APSInt Value(Info.Ctx.getIntWidth(E->getType()),
             E->getType()->isUnsignedIntegerOrEnumerationType());
if (!handleIntIntBinOp(Info, E, LHSVal.getInt(), E->getOpcode(),
                       RHSVal.getInt(), Value))
  return false;
return Success(Value, E, Result);
11035}

11037void DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) {
Job &job = Queue.back();

switch (job.Kind) {
  case Job::AnyExprKind: {
    if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) {
      if (shouldEnqueue(Bop)) {
        job.Kind = Job::BinOpKind;
        enqueue(Bop->getLHS());
        return;
      }
    }

    EvaluateExpr(job.E, Result);
    Queue.pop_back();
    return;
  }

  case Job::BinOpKind: {
    const BinaryOperator *Bop = cast<BinaryOperator>(job.E);
    bool SuppressRHSDiags = false;
    if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) {
      Queue.pop_back();
      return;
    }
    if (SuppressRHSDiags)
      job.startSpeculativeEval(Info);
    job.LHSResult.swap(Result);
    job.Kind = Job::BinOpVisitedLHSKind;
    enqueue(Bop->getRHS());
    return;
  }

  case Job::BinOpVisitedLHSKind: {
    const BinaryOperator *Bop = cast<BinaryOperator>(job.E);
    EvalResult RHS;
    RHS.swap(Result);
    Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val);
    Queue.pop_back();
    return;
  }
}

llvm_unreachable("Invalid Job::Kind!")::llvm::llvm_unreachable_internal("Invalid Job::Kind!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11080);
11081}

11083namespace {
11084/// Used when we determine that we should fail, but can keep evaluating prior to
11085/// noting that we had a failure.
11086class DelayedNoteFailureRAII {
EvalInfo &Info;
bool NoteFailure;

11090public:
DelayedNoteFailureRAII(EvalInfo &Info, bool NoteFailure = true)
    : Info(Info), NoteFailure(NoteFailure) {}
~DelayedNoteFailureRAII() {
  if (NoteFailure) {
    bool ContinueAfterFailure = Info.noteFailure();
    (void)ContinueAfterFailure;
    assert(ContinueAfterFailure &&((ContinueAfterFailure && "Shouldn't have kept evaluating on failure."
) ? static_cast<void> (0) : __assert_fail ("ContinueAfterFailure && \"Shouldn't have kept evaluating on failure.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11098, __PRETTY_FUNCTION__))
           "Shouldn't have kept evaluating on failure.")((ContinueAfterFailure && "Shouldn't have kept evaluating on failure."
) ? static_cast<void> (0) : __assert_fail ("ContinueAfterFailure && \"Shouldn't have kept evaluating on failure.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11098, __PRETTY_FUNCTION__));
  }
}
11101};
11102}

11104template <class SuccessCB, class AfterCB>
11105static bool
11106EvaluateComparisonBinaryOperator(EvalInfo &Info, const BinaryOperator *E,
                               SuccessCB &&Success, AfterCB &&DoAfter) {
assert(E->isComparisonOp() && "expected comparison operator")((E->isComparisonOp() && "expected comparison operator"
) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"expected comparison operator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11108, __PRETTY_FUNCTION__));
assert((E->getOpcode() == BO_Cmp ||(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType
()) && "unsupported binary expression evaluation") ? static_cast
<void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11111, __PRETTY_FUNCTION__))
        E->getType()->isIntegralOrEnumerationType()) &&(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType
()) && "unsupported binary expression evaluation") ? static_cast
<void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11111, __PRETTY_FUNCTION__))
       "unsupported binary expression evaluation")(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType
()) && "unsupported binary expression evaluation") ? static_cast
<void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11111, __PRETTY_FUNCTION__));
auto Error = [&](const Expr *E) {
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
};

using CCR = ComparisonCategoryResult;
bool IsRelational = E->isRelationalOp();
bool IsEquality = E->isEqualityOp();
if (E->getOpcode() == BO_Cmp) {
  const ComparisonCategoryInfo &CmpInfo =
      Info.Ctx.CompCategories.getInfoForType(E->getType());
  IsRelational = CmpInfo.isOrdered();
  IsEquality = CmpInfo.isEquality();
}

QualType LHSTy = E->getLHS()->getType();
QualType RHSTy = E->getRHS()->getType();

if (LHSTy->isIntegralOrEnumerationType() &&
    RHSTy->isIntegralOrEnumerationType()) {
  APSInt LHS, RHS;
  bool LHSOK = EvaluateInteger(E->getLHS(), LHS, Info);
  if (!LHSOK && !Info.noteFailure())
    return false;
  if (!EvaluateInteger(E->getRHS(), RHS, Info) || !LHSOK)
    return false;
  if (LHS < RHS)
    return Success(CCR::Less, E);
  if (LHS > RHS)
    return Success(CCR::Greater, E);
  return Success(CCR::Equal, E);
}

if (LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) {
  APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHSTy));
  APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHSTy));

  bool LHSOK = EvaluateFixedPointOrInteger(E->getLHS(), LHSFX, Info);
  if (!LHSOK && !Info.noteFailure())
    return false;
  if (!EvaluateFixedPointOrInteger(E->getRHS(), RHSFX, Info) || !LHSOK)
    return false;
  if (LHSFX < RHSFX)
    return Success(CCR::Less, E);
  if (LHSFX > RHSFX)
    return Success(CCR::Greater, E);
  return Success(CCR::Equal, E);
}

if (LHSTy->isAnyComplexType() || RHSTy->isAnyComplexType()) {
  ComplexValue LHS, RHS;
  bool LHSOK;
  if (E->isAssignmentOp()) {
    LValue LV;
    EvaluateLValue(E->getLHS(), LV, Info);
    LHSOK = false;
  } else if (LHSTy->isRealFloatingType()) {
    LHSOK = EvaluateFloat(E->getLHS(), LHS.FloatReal, Info);
    if (LHSOK) {
      LHS.makeComplexFloat();
      LHS.FloatImag = APFloat(LHS.FloatReal.getSemantics());
    }
  } else {
    LHSOK = EvaluateComplex(E->getLHS(), LHS, Info);
  }
  if (!LHSOK && !Info.noteFailure())
    return false;

  if (E->getRHS()->getType()->isRealFloatingType()) {
    if (!EvaluateFloat(E->getRHS(), RHS.FloatReal, Info) || !LHSOK)
      return false;
    RHS.makeComplexFloat();
    RHS.FloatImag = APFloat(RHS.FloatReal.getSemantics());
  } else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK)
    return false;

  if (LHS.isComplexFloat()) {
    APFloat::cmpResult CR_r =
      LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal());
    APFloat::cmpResult CR_i =
      LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag());
    bool IsEqual = CR_r == APFloat::cmpEqual && CR_i == APFloat::cmpEqual;
    return Success(IsEqual ? CCR::Equal : CCR::Nonequal, E);
  } else {
    assert(IsEquality && "invalid complex comparison")((IsEquality && "invalid complex comparison") ? static_cast
<void> (0) : __assert_fail ("IsEquality && \"invalid complex comparison\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11196, __PRETTY_FUNCTION__));
    bool IsEqual = LHS.getComplexIntReal() == RHS.getComplexIntReal() &&
                   LHS.getComplexIntImag() == RHS.getComplexIntImag();
    return Success(IsEqual ? CCR::Equal : CCR::Nonequal, E);
  }
}

if (LHSTy->isRealFloatingType() &&
    RHSTy->isRealFloatingType()) {
  APFloat RHS(0.0), LHS(0.0);

  bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info);
  if (!LHSOK && !Info.noteFailure())
    return false;

  if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK)
    return false;

  assert(E->isComparisonOp() && "Invalid binary operator!")((E->isComparisonOp() && "Invalid binary operator!"
) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"Invalid binary operator!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11214, __PRETTY_FUNCTION__));
  auto GetCmpRes = [&]() {
    switch (LHS.compare(RHS)) {
    case APFloat::cmpEqual:
      return CCR::Equal;
    case APFloat::cmpLessThan:
      return CCR::Less;
    case APFloat::cmpGreaterThan:
      return CCR::Greater;
    case APFloat::cmpUnordered:
      return CCR::Unordered;
    }
    llvm_unreachable("Unrecognised APFloat::cmpResult enum")::llvm::llvm_unreachable_internal("Unrecognised APFloat::cmpResult enum"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11226);
  };
  return Success(GetCmpRes(), E);
}

if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
  LValue LHSValue, RHSValue;

  bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info);
  if (!LHSOK && !Info.noteFailure())
    return false;

  if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK)
    return false;

  // Reject differing bases from the normal codepath; we special-case
  // comparisons to null.
  if (!HasSameBase(LHSValue, RHSValue)) {
    // Inequalities and subtractions between unrelated pointers have
    // unspecified or undefined behavior.
    if (!IsEquality)
      return Error(E);
    // A constant address may compare equal to the address of a symbol.
    // The one exception is that address of an object cannot compare equal
    // to a null pointer constant.
    if ((!LHSValue.Base && !LHSValue.Offset.isZero()) ||
        (!RHSValue.Base && !RHSValue.Offset.isZero()))
      return Error(E);
    // It's implementation-defined whether distinct literals will have
    // distinct addresses. In clang, the result of such a comparison is
    // unspecified, so it is not a constant expression. However, we do know
    // that the address of a literal will be non-null.
    if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) &&
        LHSValue.Base && RHSValue.Base)
      return Error(E);
    // We can't tell whether weak symbols will end up pointing to the same
    // object.
    if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue))
      return Error(E);
    // We can't compare the address of the start of one object with the
    // past-the-end address of another object, per C++ DR1652.
    if ((LHSValue.Base && LHSValue.Offset.isZero() &&
         isOnePastTheEndOfCompleteObject(Info.Ctx, RHSValue)) ||
        (RHSValue.Base && RHSValue.Offset.isZero() &&
         isOnePastTheEndOfCompleteObject(Info.Ctx, LHSValue)))
      return Error(E);
    // We can't tell whether an object is at the same address as another
    // zero sized object.
    if ((RHSValue.Base && isZeroSized(LHSValue)) ||
        (LHSValue.Base && isZeroSized(RHSValue)))
      return Error(E);
    return Success(CCR::Nonequal, E);
  }

  const CharUnits &LHSOffset = LHSValue.getLValueOffset();
  const CharUnits &RHSOffset = RHSValue.getLValueOffset();

  SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator();
  SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator();

  // C++11 [expr.rel]p3:
  //   Pointers to void (after pointer conversions) can be compared, with a
  //   result defined as follows: If both pointers represent the same
  //   address or are both the null pointer value, the result is true if the
  //   operator is <= or >= and false otherwise; otherwise the result is
  //   unspecified.
  // We interpret this as applying to pointers to *cv* void.
  if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && IsRelational)
    Info.CCEDiag(E, diag::note_constexpr_void_comparison);

  // C++11 [expr.rel]p2:
  // - If two pointers point to non-static data members of the same object,
  //   or to subobjects or array elements fo such members, recursively, the
  //   pointer to the later declared member compares greater provided the
  //   two members have the same access control and provided their class is
  //   not a union.
  //   [...]
  // - Otherwise pointer comparisons are unspecified.
  if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && IsRelational) {
    bool WasArrayIndex;
    unsigned Mismatch = FindDesignatorMismatch(
        getType(LHSValue.Base), LHSDesignator, RHSDesignator, WasArrayIndex);
    // At the point where the designators diverge, the comparison has a
    // specified value if:
    //  - we are comparing array indices
    //  - we are comparing fields of a union, or fields with the same access
    // Otherwise, the result is unspecified and thus the comparison is not a
    // constant expression.
    if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() &&
        Mismatch < RHSDesignator.Entries.size()) {
      const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]);
      const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]);
      if (!LF && !RF)
        Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes);
      else if (!LF)
        Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field)
            << getAsBaseClass(LHSDesignator.Entries[Mismatch])
            << RF->getParent() << RF;
      else if (!RF)
        Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field)
            << getAsBaseClass(RHSDesignator.Entries[Mismatch])
            << LF->getParent() << LF;
      else if (!LF->getParent()->isUnion() &&
               LF->getAccess() != RF->getAccess())
        Info.CCEDiag(E,
                     diag::note_constexpr_pointer_comparison_differing_access)
            << LF << LF->getAccess() << RF << RF->getAccess()
            << LF->getParent();
    }
  }

  // The comparison here must be unsigned, and performed with the same
  // width as the pointer.
  unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy);
  uint64_t CompareLHS = LHSOffset.getQuantity();
  uint64_t CompareRHS = RHSOffset.getQuantity();
  assert(PtrSize <= 64 && "Unexpected pointer width")((PtrSize <= 64 && "Unexpected pointer width") ? static_cast
<void> (0) : __assert_fail ("PtrSize <= 64 && \"Unexpected pointer width\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11342, __PRETTY_FUNCTION__));
  uint64_t Mask = ~0ULL >> (64 - PtrSize);
  CompareLHS &= Mask;
  CompareRHS &= Mask;

  // If there is a base and this is a relational operator, we can only
  // compare pointers within the object in question; otherwise, the result
  // depends on where the object is located in memory.
  if (!LHSValue.Base.isNull() && IsRelational) {
    QualType BaseTy = getType(LHSValue.Base);
    if (BaseTy->isIncompleteType())
      return Error(E);
    CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy);
    uint64_t OffsetLimit = Size.getQuantity();
    if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit)
      return Error(E);
  }

  if (CompareLHS < CompareRHS)
    return Success(CCR::Less, E);
  if (CompareLHS > CompareRHS)
    return Success(CCR::Greater, E);
  return Success(CCR::Equal, E);
}

if (LHSTy->isMemberPointerType()) {
  assert(IsEquality && "unexpected member pointer operation")((IsEquality && "unexpected member pointer operation"
) ? static_cast<void> (0) : __assert_fail ("IsEquality && \"unexpected member pointer operation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11368, __PRETTY_FUNCTION__));
  assert(RHSTy->isMemberPointerType() && "invalid comparison")((RHSTy->isMemberPointerType() && "invalid comparison"
) ? static_cast<void> (0) : __assert_fail ("RHSTy->isMemberPointerType() && \"invalid comparison\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11369, __PRETTY_FUNCTION__));

  MemberPtr LHSValue, RHSValue;

  bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info);
  if (!LHSOK && !Info.noteFailure())
    return false;

  if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK)
    return false;

  // C++11 [expr.eq]p2:
  //   If both operands are null, they compare equal. Otherwise if only one is
  //   null, they compare unequal.
  if (!LHSValue.getDecl() || !RHSValue.getDecl()) {
    bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl();
    return Success(Equal ? CCR::Equal : CCR::Nonequal, E);
  }

  //   Otherwise if either is a pointer to a virtual member function, the
  //   result is unspecified.
  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl()))
    if (MD->isVirtual())
      Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD;
  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl()))
    if (MD->isVirtual())
      Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD;

  //   Otherwise they compare equal if and only if they would refer to the
  //   same member of the same most derived object or the same subobject if
  //   they were dereferenced with a hypothetical object of the associated
  //   class type.
  bool Equal = LHSValue == RHSValue;
  return Success(Equal ? CCR::Equal : CCR::Nonequal, E);
}

if (LHSTy->isNullPtrType()) {
  assert(E->isComparisonOp() && "unexpected nullptr operation")((E->isComparisonOp() && "unexpected nullptr operation"
) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"unexpected nullptr operation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11406, __PRETTY_FUNCTION__));
  assert(RHSTy->isNullPtrType() && "missing pointer conversion")((RHSTy->isNullPtrType() && "missing pointer conversion"
) ? static_cast<void> (0) : __assert_fail ("RHSTy->isNullPtrType() && \"missing pointer conversion\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11407, __PRETTY_FUNCTION__));
  // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t
  // are compared, the result is true of the operator is <=, >= or ==, and
  // false otherwise.
  return Success(CCR::Equal, E);
}

return DoAfter();
11415}

11417bool RecordExprEvaluator::VisitBinCmp(const BinaryOperator *E) {
if (!CheckLiteralType(Info, E))
  return false;

auto OnSuccess = [&](ComparisonCategoryResult ResKind,
                     const BinaryOperator *E) {
  // Evaluation succeeded. Lookup the information for the comparison category
  // type and fetch the VarDecl for the result.
  const ComparisonCategoryInfo &CmpInfo =
      Info.Ctx.CompCategories.getInfoForType(E->getType());
  const VarDecl *VD =
      CmpInfo.getValueInfo(CmpInfo.makeWeakResult(ResKind))->VD;
  // Check and evaluate the result as a constant expression.
  LValue LV;
  LV.set(VD);
  if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result))
    return false;
  return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result);
};
return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() {
  return ExprEvaluatorBaseTy::VisitBinCmp(E);
});
11439}

11441bool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
// We don't call noteFailure immediately because the assignment happens after
// we evaluate LHS and RHS.
if (!Info.keepEvaluatingAfterFailure() && E->isAssignmentOp())
1
Assuming the condition is false→
  return Error(E);

DelayedNoteFailureRAII MaybeNoteFailureLater(Info, E->isAssignmentOp());
if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E))
2
←
Calling 'DataRecursiveIntBinOpEvaluator::shouldEnqueue'→
4
←
Returning from 'DataRecursiveIntBinOpEvaluator::shouldEnqueue'→
5
←
Taking false branch→
  return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E);

assert((!E->getLHS()->getType()->isIntegralOrEnumerationType() ||(((!E->getLHS()->getType()->isIntegralOrEnumerationType
() || !E->getRHS()->getType()->isIntegralOrEnumerationType
()) && "DataRecursiveIntBinOpEvaluator should have handled integral types"
) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11453, __PRETTY_FUNCTION__))
6
←
'?' condition is true→
        !E->getRHS()->getType()->isIntegralOrEnumerationType()) &&(((!E->getLHS()->getType()->isIntegralOrEnumerationType
() || !E->getRHS()->getType()->isIntegralOrEnumerationType
()) && "DataRecursiveIntBinOpEvaluator should have handled integral types"
) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11453, __PRETTY_FUNCTION__))
       "DataRecursiveIntBinOpEvaluator should have handled integral types")(((!E->getLHS()->getType()->isIntegralOrEnumerationType
() || !E->getRHS()->getType()->isIntegralOrEnumerationType
()) && "DataRecursiveIntBinOpEvaluator should have handled integral types"
) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11453, __PRETTY_FUNCTION__));

if (E->isComparisonOp()) {
7
←
Calling 'BinaryOperator::isComparisonOp'→
13
←
Returning from 'BinaryOperator::isComparisonOp'→
14
←
Taking false branch→
  // Evaluate builtin binary comparisons by evaluating them as C++2a three-way
  // comparisons and then translating the result.
  auto OnSuccess = [&](ComparisonCategoryResult ResKind,
                       const BinaryOperator *E) {
    using CCR = ComparisonCategoryResult;
    bool IsEqual   = ResKind == CCR::Equal,
         IsLess    = ResKind == CCR::Less,
         IsGreater = ResKind == CCR::Greater;
    auto Op = E->getOpcode();
    switch (Op) {
    default:
      llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11467);
    case BO_EQ:
    case BO_NE:
      return Success(IsEqual == (Op == BO_EQ), E);
    case BO_LT: return Success(IsLess, E);
    case BO_GT: return Success(IsGreater, E);
    case BO_LE: return Success(IsEqual || IsLess, E);
    case BO_GE: return Success(IsEqual || IsGreater, E);
    }
  };
  return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() {
    return ExprEvaluatorBaseTy::VisitBinaryOperator(E);
  });
}

QualType LHSTy = E->getLHS()->getType();
QualType RHSTy = E->getRHS()->getType();

if (LHSTy->isPointerType() && RHSTy->isPointerType() &&
15
←
Calling 'Type::isPointerType'→
18
←
Returning from 'Type::isPointerType'→
19
←
Calling 'Type::isPointerType'→
22
←
Returning from 'Type::isPointerType'→
24
←
Taking true branch→
    E->getOpcode() == BO_Sub) {
23
←
Assuming the condition is true→
  LValue LHSValue, RHSValue;

  bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info);
25
←
Calling 'EvaluatePointer'→
28
←
Returning from 'EvaluatePointer'→
  if (!LHSOK && !Info.noteFailure())
29
←
Assuming 'LHSOK' is true→
    return false;

  if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK34.1
'LHSOK' is true
1
'LHSOK' is true
1
'LHSOK' is true
)
30
←
Calling 'EvaluatePointer'→
33
←
Returning from 'EvaluatePointer'→
34
←
Assuming the condition is false→
35
←
Taking false branch→
    return false;

  // Reject differing bases from the normal codepath; we special-case
  // comparisons to null.
  if (!HasSameBase(LHSValue, RHSValue)) {
36
←
Calling 'HasSameBase'→
41
←
Returning from 'HasSameBase'→
42
←
Taking false branch→
    // Handle &&A - &&B.
    if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero())
      return Error(E);
    const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr *>();
    const Expr *RHSExpr = RHSValue.Base.dyn_cast<const Expr *>();
    if (!LHSExpr || !RHSExpr)
      return Error(E);
    const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr);
    const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr);
    if (!LHSAddrExpr || !RHSAddrExpr)
      return Error(E);
    // Make sure both labels come from the same function.
    if (LHSAddrExpr->getLabel()->getDeclContext() !=
        RHSAddrExpr->getLabel()->getDeclContext())
      return Error(E);
    return Success(APValue(LHSAddrExpr, RHSAddrExpr), E);
  }
  const CharUnits &LHSOffset = LHSValue.getLValueOffset();
  const CharUnits &RHSOffset = RHSValue.getLValueOffset();

  SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator();
  SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator();

  // C++11 [expr.add]p6:
  //   Unless both pointers point to elements of the same array object, or
  //   one past the last element of the array object, the behavior is
  //   undefined.
  if (!LHSDesignator.Invalid && !RHSDesignator.Invalid &&
43
←
Assuming field 'Invalid' is not equal to 0→
44
←
Taking false branch→
      !AreElementsOfSameArray(getType(LHSValue.Base), LHSDesignator,
                              RHSDesignator))
    Info.CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array);

  QualType Type = E->getLHS()->getType();
  QualType ElementType = Type->getAs<PointerType>()->getPointeeType();
45
←
Assuming the object is not a 'PointerType'→
46
←
Called C++ object pointer is null

  CharUnits ElementSize;
  if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize))
    return false;

  // As an extension, a type may have zero size (empty struct or union in
  // C, array of zero length). Pointer subtraction in such cases has
  // undefined behavior, so is not constant.
  if (ElementSize.isZero()) {
    Info.FFDiag(E, diag::note_constexpr_pointer_subtraction_zero_size)
        << ElementType;
    return false;
  }

  // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime,
  // and produce incorrect results when it overflows. Such behavior
  // appears to be non-conforming, but is common, so perhaps we should
  // assume the standard intended for such cases to be undefined behavior
  // and check for them.

  // Compute (LHSOffset - RHSOffset) / Size carefully, checking for
  // overflow in the final conversion to ptrdiff_t.
  APSInt LHS(llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false);
  APSInt RHS(llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false);
  APSInt ElemSize(llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true),
                  false);
  APSInt TrueResult = (LHS - RHS) / ElemSize;
  APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType()));

  if (Result.extend(65) != TrueResult &&
      !HandleOverflow(Info, E, TrueResult, E->getType()))
    return false;
  return Success(Result, E);
}

return ExprEvaluatorBaseTy::VisitBinaryOperator(E);
11569}

11571/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with
11572/// a result as the expression's type.
11573bool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr(
                                  const UnaryExprOrTypeTraitExpr *E) {
switch(E->getKind()) {
case UETT_PreferredAlignOf:
case UETT_AlignOf: {
  if (E->isArgumentType())
    return Success(GetAlignOfType(Info, E->getArgumentType(), E->getKind()),
                   E);
  else
    return Success(GetAlignOfExpr(Info, E->getArgumentExpr(), E->getKind()),
                   E);
}

case UETT_VecStep: {
  QualType Ty = E->getTypeOfArgument();

  if (Ty->isVectorType()) {
    unsigned n = Ty->castAs<VectorType>()->getNumElements();

    // The vec_step built-in functions that take a 3-component
    // vector return 4. (OpenCL 1.1 spec 6.11.12)
    if (n == 3)
      n = 4;

    return Success(n, E);
  } else
    return Success(1, E);
}

case UETT_SizeOf: {
  QualType SrcTy = E->getTypeOfArgument();
  // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
  //   the result is the size of the referenced type."
  if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>())
    SrcTy = Ref->getPointeeType();

  CharUnits Sizeof;
  if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof))
    return false;
  return Success(Sizeof, E);
}
case UETT_OpenMPRequiredSimdAlign:
  assert(E->isArgumentType())((E->isArgumentType()) ? static_cast<void> (0) : __assert_fail
 ("E->isArgumentType()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11615, __PRETTY_FUNCTION__));
  return Success(
      Info.Ctx.toCharUnitsFromBits(
                  Info.Ctx.getOpenMPDefaultSimdAlign(E->getArgumentType()))
          .getQuantity(),
      E);
}

llvm_unreachable("unknown expr/type trait")::llvm::llvm_unreachable_internal("unknown expr/type trait", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11623);
11624}

11626bool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) {
CharUnits Result;
unsigned n = OOE->getNumComponents();
if (n == 0)
  return Error(OOE);
QualType CurrentType = OOE->getTypeSourceInfo()->getType();
for (unsigned i = 0; i != n; ++i) {
  OffsetOfNode ON = OOE->getComponent(i);
  switch (ON.getKind()) {
  case OffsetOfNode::Array: {
    const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex());
    APSInt IdxResult;
    if (!EvaluateInteger(Idx, IdxResult, Info))
      return false;
    const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType);
    if (!AT)
      return Error(OOE);
    CurrentType = AT->getElementType();
    CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType);
    Result += IdxResult.getSExtValue() * ElementSize;
    break;
  }

  case OffsetOfNode::Field: {
    FieldDecl *MemberDecl = ON.getField();
    const RecordType *RT = CurrentType->getAs<RecordType>();
    if (!RT)
      return Error(OOE);
    RecordDecl *RD = RT->getDecl();
    if (RD->isInvalidDecl()) return false;
    const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD);
    unsigned i = MemberDecl->getFieldIndex();
    assert(i < RL.getFieldCount() && "offsetof field in wrong type")((i < RL.getFieldCount() && "offsetof field in wrong type"
) ? static_cast<void> (0) : __assert_fail ("i < RL.getFieldCount() && \"offsetof field in wrong type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11658, __PRETTY_FUNCTION__));
    Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i));
    CurrentType = MemberDecl->getType().getNonReferenceType();
    break;
  }

  case OffsetOfNode::Identifier:
    llvm_unreachable("dependent __builtin_offsetof")::llvm::llvm_unreachable_internal("dependent __builtin_offsetof"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11665);

  case OffsetOfNode::Base: {
    CXXBaseSpecifier *BaseSpec = ON.getBase();
    if (BaseSpec->isVirtual())
      return Error(OOE);

    // Find the layout of the class whose base we are looking into.
    const RecordType *RT = CurrentType->getAs<RecordType>();
    if (!RT)
      return Error(OOE);
    RecordDecl *RD = RT->getDecl();
    if (RD->isInvalidDecl()) return false;
    const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD);

    // Find the base class itself.
    CurrentType = BaseSpec->getType();
    const RecordType *BaseRT = CurrentType->getAs<RecordType>();
    if (!BaseRT)
      return Error(OOE);

    // Add the offset to the base.
    Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl()));
    break;
  }
  }
}
return Success(Result, OOE);
11693}

11695bool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) {
switch (E->getOpcode()) {
default:
  // Address, indirect, pre/post inc/dec, etc are not valid constant exprs.
  // See C99 6.6p3.
  return Error(E);
case UO_Extension:
  // FIXME: Should extension allow i-c-e extension expressions in its scope?
  // If so, we could clear the diagnostic ID.
  return Visit(E->getSubExpr());
case UO_Plus:
  // The result is just the value.
  return Visit(E->getSubExpr());
case UO_Minus: {
  if (!Visit(E->getSubExpr()))
    return false;
  if (!Result.isInt()) return Error(E);
  const APSInt &Value = Result.getInt();
  if (Value.isSigned() && Value.isMinSignedValue() && E->canOverflow() &&
      !HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1),
                      E->getType()))
    return false;
  return Success(-Value, E);
}
case UO_Not: {
  if (!Visit(E->getSubExpr()))
    return false;
  if (!Result.isInt()) return Error(E);
  return Success(~Result.getInt(), E);
}
case UO_LNot: {
  bool bres;
  if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info))
    return false;
  return Success(!bres, E);
}
}
11732}

11734/// HandleCast - This is used to evaluate implicit or explicit casts where the
11735/// result type is integer.
11736bool IntExprEvaluator::VisitCastExpr(const CastExpr *E) {
const Expr *SubExpr = E->getSubExpr();
QualType DestType = E->getType();
QualType SrcType = SubExpr->getType();

switch (E->getCastKind()) {
case CK_BaseToDerived:
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
case CK_Dynamic:
case CK_ToUnion:
case CK_ArrayToPointerDecay:
case CK_FunctionToPointerDecay:
case CK_NullToPointer:
case CK_NullToMemberPointer:
case CK_BaseToDerivedMemberPointer:
case CK_DerivedToBaseMemberPointer:
case CK_ReinterpretMemberPointer:
case CK_ConstructorConversion:
case CK_IntegralToPointer:
case CK_ToVoid:
case CK_VectorSplat:
case CK_IntegralToFloating:
case CK_FloatingCast:
case CK_CPointerToObjCPointerCast:
case CK_BlockPointerToObjCPointerCast:
case CK_AnyPointerToBlockPointerCast:
case CK_ObjCObjectLValueCast:
case CK_FloatingRealToComplex:
case CK_FloatingComplexToReal:
case CK_FloatingComplexCast:
case CK_FloatingComplexToIntegralComplex:
case CK_IntegralRealToComplex:
case CK_IntegralComplexCast:
case CK_IntegralComplexToFloatingComplex:
case CK_BuiltinFnToFnPtr:
case CK_ZeroToOCLOpaqueType:
case CK_NonAtomicToAtomic:
case CK_AddressSpaceConversion:
case CK_IntToOCLSampler:
case CK_FixedPointCast:
case CK_IntegralToFixedPoint:
  llvm_unreachable("invalid cast kind for integral value")::llvm::llvm_unreachable_internal("invalid cast kind for integral value"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11778);

case CK_BitCast:
case CK_Dependent:
case CK_LValueBitCast:
case CK_ARCProduceObject:
case CK_ARCConsumeObject:
case CK_ARCReclaimReturnedObject:
case CK_ARCExtendBlockObject:
case CK_CopyAndAutoreleaseBlockObject:
  return Error(E);

case CK_UserDefinedConversion:
case CK_LValueToRValue:
case CK_AtomicToNonAtomic:
case CK_NoOp:
case CK_LValueToRValueBitCast:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);

case CK_MemberPointerToBoolean:
case CK_PointerToBoolean:
case CK_IntegralToBoolean:
case CK_FloatingToBoolean:
case CK_BooleanToSignedIntegral:
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToBoolean: {
  bool BoolResult;
  if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info))
    return false;
  uint64_t IntResult = BoolResult;
  if (BoolResult && E->getCastKind() == CK_BooleanToSignedIntegral)
    IntResult = (uint64_t)-1;
  return Success(IntResult, E);
}

case CK_FixedPointToIntegral: {
  APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SrcType));
  if (!EvaluateFixedPoint(SubExpr, Src, Info))
    return false;
  bool Overflowed;
  llvm::APSInt Result = Src.convertToInt(
      Info.Ctx.getIntWidth(DestType),
      DestType->isSignedIntegerOrEnumerationType(), &Overflowed);
  if (Overflowed && !HandleOverflow(Info, E, Result, DestType))
    return false;
  return Success(Result, E);
}

case CK_FixedPointToBoolean: {
  // Unsigned padding does not affect this.
  APValue Val;
  if (!Evaluate(Val, Info, SubExpr))
    return false;
  return Success(Val.getFixedPoint().getBoolValue(), E);
}

case CK_IntegralCast: {
  if (!Visit(SubExpr))
    return false;

  if (!Result.isInt()) {
    // Allow casts of address-of-label differences if they are no-ops
    // or narrowing.  (The narrowing case isn't actually guaranteed to
    // be constant-evaluatable except in some narrow cases which are hard
    // to detect here.  We let it through on the assumption the user knows
    // what they are doing.)
    if (Result.isAddrLabelDiff())
      return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType);
    // Only allow casts of lvalues if they are lossless.
    return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType);
  }

  return Success(HandleIntToIntCast(Info, E, DestType, SrcType,
                                    Result.getInt()), E);
}

case CK_PointerToIntegral: {
  CCEDiag(E, diag::note_constexpr_invalid_cast) << 2;

  LValue LV;
  if (!EvaluatePointer(SubExpr, LV, Info))
    return false;

  if (LV.getLValueBase()) {
    // Only allow based lvalue casts if they are lossless.
    // FIXME: Allow a larger integer size than the pointer size, and allow
    // narrowing back down to pointer width in subsequent integral casts.
    // FIXME: Check integer type's active bits, not its type size.
    if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType))
      return Error(E);

    LV.Designator.setInvalid();
    LV.moveInto(Result);
    return true;
  }

  APSInt AsInt;
  APValue V;
  LV.moveInto(V);
  if (!V.toIntegralConstant(AsInt, SrcType, Info.Ctx))
    llvm_unreachable("Can't cast this!")::llvm::llvm_unreachable_internal("Can't cast this!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11878);

  return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E);
}

case CK_IntegralComplexToReal: {
  ComplexValue C;
  if (!EvaluateComplex(SubExpr, C, Info))
    return false;
  return Success(C.getComplexIntReal(), E);
}

case CK_FloatingToIntegral: {
  APFloat F(0.0);
  if (!EvaluateFloat(SubExpr, F, Info))
    return false;

  APSInt Value;
  if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value))
    return false;
  return Success(Value, E);
}
}

llvm_unreachable("unknown cast resulting in integral value")::llvm::llvm_unreachable_internal("unknown cast resulting in integral value"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11902);
11903}

11905bool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) {
if (E->getSubExpr()->getType()->isAnyComplexType()) {
  ComplexValue LV;
  if (!EvaluateComplex(E->getSubExpr(), LV, Info))
    return false;
  if (!LV.isComplexInt())
    return Error(E);
  return Success(LV.getComplexIntReal(), E);
}

return Visit(E->getSubExpr());
11916}

11918bool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
if (E->getSubExpr()->getType()->isComplexIntegerType()) {
  ComplexValue LV;
  if (!EvaluateComplex(E->getSubExpr(), LV, Info))
    return false;
  if (!LV.isComplexInt())
    return Error(E);
  return Success(LV.getComplexIntImag(), E);
}

VisitIgnoredValue(E->getSubExpr());
return Success(0, E);
11930}

11932bool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) {
return Success(E->getPackLength(), E);
11934}

11936bool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
return Success(E->getValue(), E);
11938}

11940bool FixedPointExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) {
switch (E->getOpcode()) {
  default:
    // Invalid unary operators
    return Error(E);
  case UO_Plus:
    // The result is just the value.
    return Visit(E->getSubExpr());
  case UO_Minus: {
    if (!Visit(E->getSubExpr())) return false;
    if (!Result.isFixedPoint())
      return Error(E);
    bool Overflowed;
    APFixedPoint Negated = Result.getFixedPoint().negate(&Overflowed);
    if (Overflowed && !HandleOverflow(Info, E, Negated, E->getType()))
      return false;
    return Success(Negated, E);
  }
  case UO_LNot: {
    bool bres;
    if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info))
      return false;
    return Success(!bres, E);
  }
}
11965}

11967bool FixedPointExprEvaluator::VisitCastExpr(const CastExpr *E) {
const Expr *SubExpr = E->getSubExpr();
QualType DestType = E->getType();
assert(DestType->isFixedPointType() &&((DestType->isFixedPointType() && "Expected destination type to be a fixed point type"
) ? static_cast<void> (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11971, __PRETTY_FUNCTION__))
       "Expected destination type to be a fixed point type")((DestType->isFixedPointType() && "Expected destination type to be a fixed point type"
) ? static_cast<void> (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 11971, __PRETTY_FUNCTION__));
auto DestFXSema = Info.Ctx.getFixedPointSemantics(DestType);

switch (E->getCastKind()) {
case CK_FixedPointCast: {
  APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SubExpr->getType()));
  if (!EvaluateFixedPoint(SubExpr, Src, Info))
    return false;
  bool Overflowed;
  APFixedPoint Result = Src.convert(DestFXSema, &Overflowed);
  if (Overflowed && !HandleOverflow(Info, E, Result, DestType))
    return false;
  return Success(Result, E);
}
case CK_IntegralToFixedPoint: {
  APSInt Src;
  if (!EvaluateInteger(SubExpr, Src, Info))
    return false;

  bool Overflowed;
  APFixedPoint IntResult = APFixedPoint::getFromIntValue(
      Src, Info.Ctx.getFixedPointSemantics(DestType), &Overflowed);

  if (Overflowed && !HandleOverflow(Info, E, IntResult, DestType))
    return false;

  return Success(IntResult, E);
}
case CK_NoOp:
case CK_LValueToRValue:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);
default:
  return Error(E);
}
12005}

12007bool FixedPointExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
const Expr *LHS = E->getLHS();
const Expr *RHS = E->getRHS();
FixedPointSemantics ResultFXSema =
    Info.Ctx.getFixedPointSemantics(E->getType());

APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHS->getType()));
if (!EvaluateFixedPointOrInteger(LHS, LHSFX, Info))
  return false;
APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHS->getType()));
if (!EvaluateFixedPointOrInteger(RHS, RHSFX, Info))
  return false;

switch (E->getOpcode()) {
case BO_Add: {
  bool AddOverflow, ConversionOverflow;
  APFixedPoint Result = LHSFX.add(RHSFX, &AddOverflow)
                            .convert(ResultFXSema, &ConversionOverflow);
  if ((AddOverflow || ConversionOverflow) &&
      !HandleOverflow(Info, E, Result, E->getType()))
    return false;
  return Success(Result, E);
}
default:
  return false;
}
llvm_unreachable("Should've exited before this")::llvm::llvm_unreachable_internal("Should've exited before this"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12033);
12034}

12036//===----------------------------------------------------------------------===//
12037// Float Evaluation
12038//===----------------------------------------------------------------------===//

12040namespace {
12041class FloatExprEvaluator
: public ExprEvaluatorBase<FloatExprEvaluator> {
APFloat &Result;
12044public:
FloatExprEvaluator(EvalInfo &info, APFloat &result)
  : ExprEvaluatorBaseTy(info), Result(result) {}

bool Success(const APValue &V, const Expr *e) {
  Result = V.getFloat();
  return true;
}

bool ZeroInitialization(const Expr *E) {
  Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType()));
  return true;
}

bool VisitCallExpr(const CallExpr *E);

bool VisitUnaryOperator(const UnaryOperator *E);
bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitFloatingLiteral(const FloatingLiteral *E);
bool VisitCastExpr(const CastExpr *E);

bool VisitUnaryReal(const UnaryOperator *E);
bool VisitUnaryImag(const UnaryOperator *E);

// FIXME: Missing: array subscript of vector, member of vector
12069};
12070} // end anonymous namespace

12072static bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isRealFloatingType())((E->isRValue() && E->getType()->isRealFloatingType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRealFloatingType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12073, __PRETTY_FUNCTION__));
return FloatExprEvaluator(Info, Result).Visit(E);
12075}

12077static bool TryEvaluateBuiltinNaN(const ASTContext &Context,
                                QualType ResultTy,
                                const Expr *Arg,
                                bool SNaN,
                                llvm::APFloat &Result) {
const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
if (!S) return false;

const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy);

llvm::APInt fill;

// Treat empty strings as if they were zero.
if (S->getString().empty())
  fill = llvm::APInt(32, 0);
else if (S->getString().getAsInteger(0, fill))
  return false;

if (Context.getTargetInfo().isNan2008()) {
  if (SNaN)
    Result = llvm::APFloat::getSNaN(Sem, false, &fill);
  else
    Result = llvm::APFloat::getQNaN(Sem, false, &fill);
} else {
  // Prior to IEEE 754-2008, architectures were allowed to choose whether
  // the first bit of their significand was set for qNaN or sNaN. MIPS chose
  // a different encoding to what became a standard in 2008, and for pre-
  // 2008 revisions, MIPS interpreted sNaN-2008 as qNan and qNaN-2008 as
  // sNaN. This is now known as "legacy NaN" encoding.
  if (SNaN)
    Result = llvm::APFloat::getQNaN(Sem, false, &fill);
  else
    Result = llvm::APFloat::getSNaN(Sem, false, &fill);
}

return true;
12113}

12115bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
switch (E->getBuiltinCallee()) {
default:
  return ExprEvaluatorBaseTy::VisitCallExpr(E);

case Builtin::BI__builtin_huge_val:
case Builtin::BI__builtin_huge_valf:
case Builtin::BI__builtin_huge_vall:
case Builtin::BI__builtin_huge_valf128:
case Builtin::BI__builtin_inf:
case Builtin::BI__builtin_inff:
case Builtin::BI__builtin_infl:
case Builtin::BI__builtin_inff128: {
  const llvm::fltSemantics &Sem =
    Info.Ctx.getFloatTypeSemantics(E->getType());
  Result = llvm::APFloat::getInf(Sem);
  return true;
}

case Builtin::BI__builtin_nans:
case Builtin::BI__builtin_nansf:
case Builtin::BI__builtin_nansl:
case Builtin::BI__builtin_nansf128:
  if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0),
                             true, Result))
    return Error(E);
  return true;

case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl:
case Builtin::BI__builtin_nanf128:
  // If this is __builtin_nan() turn this into a nan, otherwise we
  // can't constant fold it.
  if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0),
                             false, Result))
    return Error(E);
  return true;

case Builtin::BI__builtin_fabs:
case Builtin::BI__builtin_fabsf:
case Builtin::BI__builtin_fabsl:
case Builtin::BI__builtin_fabsf128:
  if (!EvaluateFloat(E->getArg(0), Result, Info))
    return false;

  if (Result.isNegative())
    Result.changeSign();
  return true;

// FIXME: Builtin::BI__builtin_powi
// FIXME: Builtin::BI__builtin_powif
// FIXME: Builtin::BI__builtin_powil

case Builtin::BI__builtin_copysign:
case Builtin::BI__builtin_copysignf:
case Builtin::BI__builtin_copysignl:
case Builtin::BI__builtin_copysignf128: {
  APFloat RHS(0.);
  if (!EvaluateFloat(E->getArg(0), Result, Info) ||
      !EvaluateFloat(E->getArg(1), RHS, Info))
    return false;
  Result.copySign(RHS);
  return true;
}
}
12181}

12183bool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) {
if (E->getSubExpr()->getType()->isAnyComplexType()) {
  ComplexValue CV;
  if (!EvaluateComplex(E->getSubExpr(), CV, Info))
    return false;
  Result = CV.FloatReal;
  return true;
}

return Visit(E->getSubExpr());
12193}

12195bool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
if (E->getSubExpr()->getType()->isAnyComplexType()) {
  ComplexValue CV;
  if (!EvaluateComplex(E->getSubExpr(), CV, Info))
    return false;
  Result = CV.FloatImag;
  return true;
}

VisitIgnoredValue(E->getSubExpr());
const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType());
Result = llvm::APFloat::getZero(Sem);
return true;
12208}

12210bool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) {
switch (E->getOpcode()) {
default: return Error(E);
case UO_Plus:
  return EvaluateFloat(E->getSubExpr(), Result, Info);
case UO_Minus:
  if (!EvaluateFloat(E->getSubExpr(), Result, Info))
    return false;
  Result.changeSign();
  return true;
}
12221}

12223bool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma)
  return ExprEvaluatorBaseTy::VisitBinaryOperator(E);

APFloat RHS(0.0);
bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info);
if (!LHSOK && !Info.noteFailure())
  return false;
return EvaluateFloat(E->getRHS(), RHS, Info) && LHSOK &&
       handleFloatFloatBinOp(Info, E, Result, E->getOpcode(), RHS);
12233}

12235bool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) {
Result = E->getValue();
return true;
12238}

12240bool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) {
const Expr* SubExpr = E->getSubExpr();

switch (E->getCastKind()) {
default:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);

case CK_IntegralToFloating: {
  APSInt IntResult;
  return EvaluateInteger(SubExpr, IntResult, Info) &&
         HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult,
                              E->getType(), Result);
}

case CK_FloatingCast: {
  if (!Visit(SubExpr))
    return false;
  return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(),
                                Result);
}

case CK_FloatingComplexToReal: {
  ComplexValue V;
  if (!EvaluateComplex(SubExpr, V, Info))
    return false;
  Result = V.getComplexFloatReal();
  return true;
}
}
12269}

12271//===----------------------------------------------------------------------===//
12272// Complex Evaluation (for float and integer)
12273//===----------------------------------------------------------------------===//

12275namespace {
12276class ComplexExprEvaluator
: public ExprEvaluatorBase<ComplexExprEvaluator> {
ComplexValue &Result;

12280public:
ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result)
  : ExprEvaluatorBaseTy(info), Result(Result) {}

bool Success(const APValue &V, const Expr *e) {
  Result.setFrom(V);
  return true;
}

bool ZeroInitialization(const Expr *E);

//===--------------------------------------------------------------------===//
//                            Visitor Methods
//===--------------------------------------------------------------------===//

bool VisitImaginaryLiteral(const ImaginaryLiteral *E);
bool VisitCastExpr(const CastExpr *E);
bool VisitBinaryOperator(const BinaryOperator *E);
bool VisitUnaryOperator(const UnaryOperator *E);
bool VisitInitListExpr(const InitListExpr *E);
12300};
12301} // end anonymous namespace

12303static bool EvaluateComplex(const Expr *E, ComplexValue &Result,
                          EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isAnyComplexType())((E->isRValue() && E->getType()->isAnyComplexType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isAnyComplexType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12305, __PRETTY_FUNCTION__));
return ComplexExprEvaluator(Info, Result).Visit(E);
12307}

12309bool ComplexExprEvaluator::ZeroInitialization(const Expr *E) {
QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
if (ElemTy->isRealFloatingType()) {
  Result.makeComplexFloat();
  APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy));
  Result.FloatReal = Zero;
  Result.FloatImag = Zero;
} else {
  Result.makeComplexInt();
  APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy);
  Result.IntReal = Zero;
  Result.IntImag = Zero;
}
return true;
12323}

12325bool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) {
const Expr* SubExpr = E->getSubExpr();

if (SubExpr->getType()->isRealFloatingType()) {
  Result.makeComplexFloat();
  APFloat &Imag = Result.FloatImag;
  if (!EvaluateFloat(SubExpr, Imag, Info))
    return false;

  Result.FloatReal = APFloat(Imag.getSemantics());
  return true;
} else {
  assert(SubExpr->getType()->isIntegerType() &&((SubExpr->getType()->isIntegerType() && "Unexpected imaginary literal."
) ? static_cast<void> (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12338, __PRETTY_FUNCTION__))
         "Unexpected imaginary literal.")((SubExpr->getType()->isIntegerType() && "Unexpected imaginary literal."
) ? static_cast<void> (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12338, __PRETTY_FUNCTION__));

  Result.makeComplexInt();
  APSInt &Imag = Result.IntImag;
  if (!EvaluateInteger(SubExpr, Imag, Info))
    return false;

  Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned());
  return true;
}
12348}

12350bool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) {

switch (E->getCastKind()) {
case CK_BitCast:
case CK_BaseToDerived:
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
case CK_Dynamic:
case CK_ToUnion:
case CK_ArrayToPointerDecay:
case CK_FunctionToPointerDecay:
case CK_NullToPointer:
case CK_NullToMemberPointer:
case CK_BaseToDerivedMemberPointer:
case CK_DerivedToBaseMemberPointer:
case CK_MemberPointerToBoolean:
case CK_ReinterpretMemberPointer:
case CK_ConstructorConversion:
case CK_IntegralToPointer:
case CK_PointerToIntegral:
case CK_PointerToBoolean:
case CK_ToVoid:
case CK_VectorSplat:
case CK_IntegralCast:
case CK_BooleanToSignedIntegral:
case CK_IntegralToBoolean:
case CK_IntegralToFloating:
case CK_FloatingToIntegral:
case CK_FloatingToBoolean:
case CK_FloatingCast:
case CK_CPointerToObjCPointerCast:
case CK_BlockPointerToObjCPointerCast:
case CK_AnyPointerToBlockPointerCast:
case CK_ObjCObjectLValueCast:
case CK_FloatingComplexToReal:
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToReal:
case CK_IntegralComplexToBoolean:
case CK_ARCProduceObject:
case CK_ARCConsumeObject:
case CK_ARCReclaimReturnedObject:
case CK_ARCExtendBlockObject:
case CK_CopyAndAutoreleaseBlockObject:
case CK_BuiltinFnToFnPtr:
case CK_ZeroToOCLOpaqueType:
case CK_NonAtomicToAtomic:
case CK_AddressSpaceConversion:
case CK_IntToOCLSampler:
case CK_FixedPointCast:
case CK_FixedPointToBoolean:
case CK_FixedPointToIntegral:
case CK_IntegralToFixedPoint:
  llvm_unreachable("invalid cast kind for complex value")::llvm::llvm_unreachable_internal("invalid cast kind for complex value"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12402);

case CK_LValueToRValue:
case CK_AtomicToNonAtomic:
case CK_NoOp:
case CK_LValueToRValueBitCast:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);

case CK_Dependent:
case CK_LValueBitCast:
case CK_UserDefinedConversion:
  return Error(E);

case CK_FloatingRealToComplex: {
  APFloat &Real = Result.FloatReal;
  if (!EvaluateFloat(E->getSubExpr(), Real, Info))
    return false;

  Result.makeComplexFloat();
  Result.FloatImag = APFloat(Real.getSemantics());
  return true;
}

case CK_FloatingComplexCast: {
  if (!Visit(E->getSubExpr()))
    return false;

  QualType To = E->getType()->getAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType();

  return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) &&
         HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag);
}

case CK_FloatingComplexToIntegralComplex: {
  if (!Visit(E->getSubExpr()))
    return false;

  QualType To = E->getType()->getAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType();
  Result.makeComplexInt();
  return HandleFloatToIntCast(Info, E, From, Result.FloatReal,
                              To, Result.IntReal) &&
         HandleFloatToIntCast(Info, E, From, Result.FloatImag,
                              To, Result.IntImag);
}

case CK_IntegralRealToComplex: {
  APSInt &Real = Result.IntReal;
  if (!EvaluateInteger(E->getSubExpr(), Real, Info))
    return false;

  Result.makeComplexInt();
  Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned());
  return true;
}

case CK_IntegralComplexCast: {
  if (!Visit(E->getSubExpr()))
    return false;

  QualType To = E->getType()->getAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType();

  Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal);
  Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag);
  return true;
}

case CK_IntegralComplexToFloatingComplex: {
  if (!Visit(E->getSubExpr()))
    return false;

  QualType To = E->getType()->castAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType();
  Result.makeComplexFloat();
  return HandleIntToFloatCast(Info, E, From, Result.IntReal,
                              To, Result.FloatReal) &&
         HandleIntToFloatCast(Info, E, From, Result.IntImag,
                              To, Result.FloatImag);
}
}

llvm_unreachable("unknown cast resulting in complex value")::llvm::llvm_unreachable_internal("unknown cast resulting in complex value"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12489);
12490}

12492bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma)
  return ExprEvaluatorBaseTy::VisitBinaryOperator(E);

// Track whether the LHS or RHS is real at the type system level. When this is
// the case we can simplify our evaluation strategy.
bool LHSReal = false, RHSReal = false;

bool LHSOK;
if (E->getLHS()->getType()->isRealFloatingType()) {
  LHSReal = true;
  APFloat &Real = Result.FloatReal;
  LHSOK = EvaluateFloat(E->getLHS(), Real, Info);
  if (LHSOK) {
    Result.makeComplexFloat();
    Result.FloatImag = APFloat(Real.getSemantics());
  }
} else {
  LHSOK = Visit(E->getLHS());
}
if (!LHSOK && !Info.noteFailure())
  return false;

ComplexValue RHS;
if (E->getRHS()->getType()->isRealFloatingType()) {
  RHSReal = true;
  APFloat &Real = RHS.FloatReal;
  if (!EvaluateFloat(E->getRHS(), Real, Info) || !LHSOK)
    return false;
  RHS.makeComplexFloat();
  RHS.FloatImag = APFloat(Real.getSemantics());
} else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK)
  return false;

assert(!(LHSReal && RHSReal) &&((!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real."
) ? static_cast<void> (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12527, __PRETTY_FUNCTION__))
       "Cannot have both operands of a complex operation be real.")((!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real."
) ? static_cast<void> (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12527, __PRETTY_FUNCTION__));
switch (E->getOpcode()) {
default: return Error(E);
case BO_Add:
  if (Result.isComplexFloat()) {
    Result.getComplexFloatReal().add(RHS.getComplexFloatReal(),
                                     APFloat::rmNearestTiesToEven);
    if (LHSReal)
      Result.getComplexFloatImag() = RHS.getComplexFloatImag();
    else if (!RHSReal)
      Result.getComplexFloatImag().add(RHS.getComplexFloatImag(),
                                       APFloat::rmNearestTiesToEven);
  } else {
    Result.getComplexIntReal() += RHS.getComplexIntReal();
    Result.getComplexIntImag() += RHS.getComplexIntImag();
  }
  break;
case BO_Sub:
  if (Result.isComplexFloat()) {
    Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(),
                                          APFloat::rmNearestTiesToEven);
    if (LHSReal) {
      Result.getComplexFloatImag() = RHS.getComplexFloatImag();
      Result.getComplexFloatImag().changeSign();
    } else if (!RHSReal) {
      Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(),
                                            APFloat::rmNearestTiesToEven);
    }
  } else {
    Result.getComplexIntReal() -= RHS.getComplexIntReal();
    Result.getComplexIntImag() -= RHS.getComplexIntImag();
  }
  break;
case BO_Mul:
  if (Result.isComplexFloat()) {
    // This is an implementation of complex multiplication according to the
    // constraints laid out in C11 Annex G. The implementation uses the
    // following naming scheme:
    //   (a + ib) * (c + id)
    ComplexValue LHS = Result;
    APFloat &A = LHS.getComplexFloatReal();
    APFloat &B = LHS.getComplexFloatImag();
    APFloat &C = RHS.getComplexFloatReal();
    APFloat &D = RHS.getComplexFloatImag();
    APFloat &ResR = Result.getComplexFloatReal();
    APFloat &ResI = Result.getComplexFloatImag();
    if (LHSReal) {
      assert(!RHSReal && "Cannot have two real operands for a complex op!")((!RHSReal && "Cannot have two real operands for a complex op!"
) ? static_cast<void> (0) : __assert_fail ("!RHSReal && \"Cannot have two real operands for a complex op!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12574, __PRETTY_FUNCTION__));
      ResR = A * C;
      ResI = A * D;
    } else if (RHSReal) {
      ResR = C * A;
      ResI = C * B;
    } else {
      // In the fully general case, we need to handle NaNs and infinities
      // robustly.
      APFloat AC = A * C;
      APFloat BD = B * D;
      APFloat AD = A * D;
      APFloat BC = B * C;
      ResR = AC - BD;
      ResI = AD + BC;
      if (ResR.isNaN() && ResI.isNaN()) {
        bool Recalc = false;
        if (A.isInfinity() || B.isInfinity()) {
          A = APFloat::copySign(
              APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A);
          B = APFloat::copySign(
              APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B);
          if (C.isNaN())
            C = APFloat::copySign(APFloat(C.getSemantics()), C);
          if (D.isNaN())
            D = APFloat::copySign(APFloat(D.getSemantics()), D);
          Recalc = true;
        }
        if (C.isInfinity() || D.isInfinity()) {
          C = APFloat::copySign(
              APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C);
          D = APFloat::copySign(
              APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D);
          if (A.isNaN())
            A = APFloat::copySign(APFloat(A.getSemantics()), A);
          if (B.isNaN())
            B = APFloat::copySign(APFloat(B.getSemantics()), B);
          Recalc = true;
        }
        if (!Recalc && (AC.isInfinity() || BD.isInfinity() ||
                        AD.isInfinity() || BC.isInfinity())) {
          if (A.isNaN())
            A = APFloat::copySign(APFloat(A.getSemantics()), A);
          if (B.isNaN())
            B = APFloat::copySign(APFloat(B.getSemantics()), B);
          if (C.isNaN())
            C = APFloat::copySign(APFloat(C.getSemantics()), C);
          if (D.isNaN())
            D = APFloat::copySign(APFloat(D.getSemantics()), D);
          Recalc = true;
        }
        if (Recalc) {
          ResR = APFloat::getInf(A.getSemantics()) * (A * C - B * D);
          ResI = APFloat::getInf(A.getSemantics()) * (A * D + B * C);
        }
      }
    }
  } else {
    ComplexValue LHS = Result;
    Result.getComplexIntReal() =
      (LHS.getComplexIntReal() * RHS.getComplexIntReal() -
       LHS.getComplexIntImag() * RHS.getComplexIntImag());
    Result.getComplexIntImag() =
      (LHS.getComplexIntReal() * RHS.getComplexIntImag() +
       LHS.getComplexIntImag() * RHS.getComplexIntReal());
  }
  break;
case BO_Div:
  if (Result.isComplexFloat()) {
    // This is an implementation of complex division according to the
    // constraints laid out in C11 Annex G. The implementation uses the
    // following naming scheme:
    //   (a + ib) / (c + id)
    ComplexValue LHS = Result;
    APFloat &A = LHS.getComplexFloatReal();
    APFloat &B = LHS.getComplexFloatImag();
    APFloat &C = RHS.getComplexFloatReal();
    APFloat &D = RHS.getComplexFloatImag();
    APFloat &ResR = Result.getComplexFloatReal();
    APFloat &ResI = Result.getComplexFloatImag();
    if (RHSReal) {
      ResR = A / C;
      ResI = B / C;
    } else {
      if (LHSReal) {
        // No real optimizations we can do here, stub out with zero.
        B = APFloat::getZero(A.getSemantics());
      }
      int DenomLogB = 0;
      APFloat MaxCD = maxnum(abs(C), abs(D));
      if (MaxCD.isFinite()) {
        DenomLogB = ilogb(MaxCD);
        C = scalbn(C, -DenomLogB, APFloat::rmNearestTiesToEven);
        D = scalbn(D, -DenomLogB, APFloat::rmNearestTiesToEven);
      }
      APFloat Denom = C * C + D * D;
      ResR = scalbn((A * C + B * D) / Denom, -DenomLogB,
                    APFloat::rmNearestTiesToEven);
      ResI = scalbn((B * C - A * D) / Denom, -DenomLogB,
                    APFloat::rmNearestTiesToEven);
      if (ResR.isNaN() && ResI.isNaN()) {
        if (Denom.isPosZero() && (!A.isNaN() || !B.isNaN())) {
          ResR = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * A;
          ResI = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * B;
        } else if ((A.isInfinity() || B.isInfinity()) && C.isFinite() &&
                   D.isFinite()) {
          A = APFloat::copySign(
              APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A);
          B = APFloat::copySign(
              APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B);
          ResR = APFloat::getInf(ResR.getSemantics()) * (A * C + B * D);
          ResI = APFloat::getInf(ResI.getSemantics()) * (B * C - A * D);
        } else if (MaxCD.isInfinity() && A.isFinite() && B.isFinite()) {
          C = APFloat::copySign(
              APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C);
          D = APFloat::copySign(
              APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D);
          ResR = APFloat::getZero(ResR.getSemantics()) * (A * C + B * D);
          ResI = APFloat::getZero(ResI.getSemantics()) * (B * C - A * D);
        }
      }
    }
  } else {
    if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0)
      return Error(E, diag::note_expr_divide_by_zero);

    ComplexValue LHS = Result;
    APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() +
      RHS.getComplexIntImag() * RHS.getComplexIntImag();
    Result.getComplexIntReal() =
      (LHS.getComplexIntReal() * RHS.getComplexIntReal() +
       LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den;
    Result.getComplexIntImag() =
      (LHS.getComplexIntImag() * RHS.getComplexIntReal() -
       LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den;
  }
  break;
}

return true;
12714}

12716bool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) {
// Get the operand value into 'Result'.
if (!Visit(E->getSubExpr()))
  return false;

switch (E->getOpcode()) {
default:
  return Error(E);
case UO_Extension:
  return true;
case UO_Plus:
  // The result is always just the subexpr.
  return true;
case UO_Minus:
  if (Result.isComplexFloat()) {
    Result.getComplexFloatReal().changeSign();
    Result.getComplexFloatImag().changeSign();
  }
  else {
    Result.getComplexIntReal() = -Result.getComplexIntReal();
    Result.getComplexIntImag() = -Result.getComplexIntImag();
  }
  return true;
case UO_Not:
  if (Result.isComplexFloat())
    Result.getComplexFloatImag().changeSign();
  else
    Result.getComplexIntImag() = -Result.getComplexIntImag();
  return true;
}
12746}

12748bool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
if (E->getNumInits() == 2) {
  if (E->getType()->isComplexType()) {
    Result.makeComplexFloat();
    if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info))
      return false;
    if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info))
      return false;
  } else {
    Result.makeComplexInt();
    if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info))
      return false;
    if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info))
      return false;
  }
  return true;
}
return ExprEvaluatorBaseTy::VisitInitListExpr(E);
12766}

12768//===----------------------------------------------------------------------===//
12769// Atomic expression evaluation, essentially just handling the NonAtomicToAtomic
12770// implicit conversion.
12771//===----------------------------------------------------------------------===//

12773namespace {
12774class AtomicExprEvaluator :
  public ExprEvaluatorBase<AtomicExprEvaluator> {
const LValue *This;
APValue &Result;
12778public:
AtomicExprEvaluator(EvalInfo &Info, const LValue *This, APValue &Result)
    : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {}

bool Success(const APValue &V, const Expr *E) {
  Result = V;
  return true;
}

bool ZeroInitialization(const Expr *E) {
  ImplicitValueInitExpr VIE(
      E->getType()->castAs<AtomicType>()->getValueType());
  // For atomic-qualified class (and array) types in C++, initialize the
  // _Atomic-wrapped subobject directly, in-place.
  return This ? EvaluateInPlace(Result, Info, *This, &VIE)
              : Evaluate(Result, Info, &VIE);
}

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    return ExprEvaluatorBaseTy::VisitCastExpr(E);
  case CK_NonAtomicToAtomic:
    return This ? EvaluateInPlace(Result, Info, *This, E->getSubExpr())
                : Evaluate(Result, Info, E->getSubExpr());
  }
}
12805};
12806} // end anonymous namespace

12808static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result,
                         EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isAtomicType())((E->isRValue() && E->getType()->isAtomicType
()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isAtomicType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12810, __PRETTY_FUNCTION__));
return AtomicExprEvaluator(Info, This, Result).Visit(E);
12812}

12814//===----------------------------------------------------------------------===//
12815// Void expression evaluation, primarily for a cast to void on the LHS of a
12816// comma operator
12817//===----------------------------------------------------------------------===//

12819namespace {
12820class VoidExprEvaluator
: public ExprEvaluatorBase<VoidExprEvaluator> {
12822public:
VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {}

bool Success(const APValue &V, const Expr *e) { return true; }

bool ZeroInitialization(const Expr *E) { return true; }

bool VisitCastExpr(const CastExpr *E) {
  switch (E->getCastKind()) {
  default:
    return ExprEvaluatorBaseTy::VisitCastExpr(E);
  case CK_ToVoid:
    VisitIgnoredValue(E->getSubExpr());
    return true;
  }
}

bool VisitCallExpr(const CallExpr *E) {
  switch (E->getBuiltinCallee()) {
  default:
    return ExprEvaluatorBaseTy::VisitCallExpr(E);
  case Builtin::BI__assume:
  case Builtin::BI__builtin_assume:
    // The argument is not evaluated!
    return true;
  }
}

bool VisitCXXDeleteExpr(const CXXDeleteExpr *E);
12851};
12852} // end anonymous namespace

12854static bool hasVirtualDestructor(QualType T) {
if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
  if (CXXDestructorDecl *DD = RD->getDestructor())
    return DD->isVirtual();
return false;
12859}

12861bool VoidExprEvaluator::VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
// We cannot speculatively evaluate a delete expression.
if (Info.SpeculativeEvaluationDepth)
  return false;

FunctionDecl *OperatorDelete = E->getOperatorDelete();
if (!OperatorDelete->isReplaceableGlobalAllocationFunction()) {
  Info.FFDiag(E, diag::note_constexpr_new_non_replaceable)
      << isa<CXXMethodDecl>(OperatorDelete) << OperatorDelete;
  return false;
}

const Expr *Arg = E->getArgument();

LValue Pointer;
if (!EvaluatePointer(Arg, Pointer, Info))
  return false;
if (Pointer.Designator.Invalid)
  return false;

// Deleting a null pointer has no effect.
if (Pointer.isNullPointer()) {
  // This is the only case where we need to produce an extension warning:
  // the only other way we can succeed is if we find a dynamic allocation,
  // and we will have warned when we allocated it in that case.
  if (!Info.getLangOpts().CPlusPlus2a)
    Info.CCEDiag(E, diag::note_constexpr_new);
  return true;
}

auto PointerAsString = [&] {
  APValue Printable;
  Pointer.moveInto(Printable);
  return Printable.getAsString(Info.Ctx, Arg->getType());
};

DynamicAllocLValue DA = Pointer.Base.dyn_cast<DynamicAllocLValue>();
if (!DA) {
  Info.FFDiag(E, diag::note_constexpr_delete_not_heap_alloc)
      << PointerAsString();
  if (Pointer.Base)
    NoteLValueLocation(Info, Pointer.Base);
  return false;
}
QualType AllocType = Pointer.Base.getDynamicAllocType();

Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA);
if (!Alloc) {
  Info.FFDiag(E, diag::note_constexpr_double_delete);
  return false;
}

if (E->isArrayForm() != AllocType->isConstantArrayType()) {
  Info.FFDiag(E, diag::note_constexpr_new_delete_mismatch)
    << E->isArrayForm() << AllocType;
  NoteLValueLocation(Info, Pointer.Base);
  return false;
}

bool Subobject = false;
if (E->isArrayForm()) {
  Subobject = Pointer.Designator.Entries.size() != 1 ||
              Pointer.Designator.Entries[0].getAsArrayIndex() != 0;
} else {
  Subobject = Pointer.Designator.MostDerivedPathLength != 0 ||
              Pointer.Designator.isOnePastTheEnd();
}
if (Subobject) {
  Info.FFDiag(E, diag::note_constexpr_delete_subobject)
      << PointerAsString() << Pointer.Designator.isOnePastTheEnd();
  return false;
}

// For the non-array case, the designator must be empty if the static type
// does not have a virtual destructor.
if (!E->isArrayForm() && Pointer.Designator.Entries.size() != 0 &&
    !hasVirtualDestructor(Arg->getType()->getPointeeType())) {
  Info.FFDiag(E, diag::note_constexpr_delete_base_nonvirt_dtor)
      << Arg->getType()->getPointeeType() << AllocType;
  return false;
}

if (!HandleDestruction(Info, E->getExprLoc(), Pointer.getLValueBase(),
                       (*Alloc)->Value, AllocType))
  return false;

if (!Info.HeapAllocs.erase(DA)) {
  // The element was already erased. This means the destructor call also
  // deleted the object.
  // FIXME: This probably results in undefined behavior before we get this
  // far, and should be diagnosed elsewhere first.
  Info.FFDiag(E, diag::note_constexpr_double_delete);
  return false;
}

return true;
12957}

12959static bool EvaluateVoid(const Expr *E, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isVoidType())((E->isRValue() && E->getType()->isVoidType(
)) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isVoidType()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 12960, __PRETTY_FUNCTION__));
return VoidExprEvaluator(Info).Visit(E);
12962}

12964//===----------------------------------------------------------------------===//
12965// Top level Expr::EvaluateAsRValue method.
12966//===----------------------------------------------------------------------===//

12968static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) {
// In C, function designators are not lvalues, but we evaluate them as if they
// are.
QualType T = E->getType();
if (E->isGLValue() || T->isFunctionType()) {
  LValue LV;
  if (!EvaluateLValue(E, LV, Info))
    return false;
  LV.moveInto(Result);
} else if (T->isVectorType()) {
  if (!EvaluateVector(E, Result, Info))
    return false;
} else if (T->isIntegralOrEnumerationType()) {
  if (!IntExprEvaluator(Info, Result).Visit(E))
    return false;
} else if (T->hasPointerRepresentation()) {
  LValue LV;
  if (!EvaluatePointer(E, LV, Info))
    return false;
  LV.moveInto(Result);
} else if (T->isRealFloatingType()) {
  llvm::APFloat F(0.0);
  if (!EvaluateFloat(E, F, Info))
    return false;
  Result = APValue(F);
} else if (T->isAnyComplexType()) {
  ComplexValue C;
  if (!EvaluateComplex(E, C, Info))
    return false;
  C.moveInto(Result);
} else if (T->isFixedPointType()) {
  if (!FixedPointExprEvaluator(Info, Result).Visit(E)) return false;
} else if (T->isMemberPointerType()) {
  MemberPtr P;
  if (!EvaluateMemberPointer(E, P, Info))
    return false;
  P.moveInto(Result);
  return true;
} else if (T->isArrayType()) {
  LValue LV;
  APValue &Value =
      Info.CurrentCall->createTemporary(E, T, false, LV);
  if (!EvaluateArray(E, LV, Value, Info))
    return false;
  Result = Value;
} else if (T->isRecordType()) {
  LValue LV;
  APValue &Value = Info.CurrentCall->createTemporary(E, T, false, LV);
  if (!EvaluateRecord(E, LV, Value, Info))
    return false;
  Result = Value;
} else if (T->isVoidType()) {
  if (!Info.getLangOpts().CPlusPlus11)
    Info.CCEDiag(E, diag::note_constexpr_nonliteral)
      << E->getType();
  if (!EvaluateVoid(E, Info))
    return false;
} else if (T->isAtomicType()) {
  QualType Unqual = T.getAtomicUnqualifiedType();
  if (Unqual->isArrayType() || Unqual->isRecordType()) {
    LValue LV;
    APValue &Value = Info.CurrentCall->createTemporary(E, Unqual, false, LV);
    if (!EvaluateAtomic(E, &LV, Value, Info))
      return false;
  } else {
    if (!EvaluateAtomic(E, nullptr, Result, Info))
      return false;
  }
} else if (Info.getLangOpts().CPlusPlus11) {
  Info.FFDiag(E, diag::note_constexpr_nonliteral) << E->getType();
  return false;
} else {
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
}

return true;
13045}

13047/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some
13048/// cases, the in-place evaluation is essential, since later initializers for
13049/// an object can indirectly refer to subobjects which were initialized earlier.
13050static bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This,
                          const Expr *E, bool AllowNonLiteralTypes) {
assert(!E->isValueDependent())((!E->isValueDependent()) ? static_cast<void> (0) : __assert_fail
 ("!E->isValueDependent()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13052, __PRETTY_FUNCTION__));

if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E, &This))
  return false;

if (E->isRValue()) {
  // Evaluate arrays and record types in-place, so that later initializers can
  // refer to earlier-initialized members of the object.
  QualType T = E->getType();
  if (T->isArrayType())
    return EvaluateArray(E, This, Result, Info);
  else if (T->isRecordType())
    return EvaluateRecord(E, This, Result, Info);
  else if (T->isAtomicType()) {
    QualType Unqual = T.getAtomicUnqualifiedType();
    if (Unqual->isArrayType() || Unqual->isRecordType())
      return EvaluateAtomic(E, &This, Result, Info);
  }
}

// For any other type, in-place evaluation is unimportant.
return Evaluate(Result, Info, E);
13074}

13076/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit
13077/// lvalue-to-rvalue cast if it is an lvalue.
13078static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) {
 if (Info.EnableNewConstInterp) {
  auto &InterpCtx = Info.Ctx.getInterpContext();
  switch (InterpCtx.evaluateAsRValue(Info, E, Result)) {
  case interp::InterpResult::Success:
    return true;
  case interp::InterpResult::Fail:
    return false;
  case interp::InterpResult::Bail:
    break;
  }
}

if (E->getType().isNull())
  return false;

if (!CheckLiteralType(Info, E))
  return false;

if (!::Evaluate(Result, Info, E))
  return false;

if (E->isGLValue()) {
  LValue LV;
  LV.setFrom(Info.Ctx, Result);
  if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result))
    return false;
}

// Check this core constant expression is a constant expression.
return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result) &&
       CheckMemoryLeaks(Info);
13110}

13112static bool FastEvaluateAsRValue(const Expr *Exp, Expr::EvalResult &Result,
                               const ASTContext &Ctx, bool &IsConst) {
// Fast-path evaluations of integer literals, since we sometimes see files
// containing vast quantities of these.
if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(Exp)) {
  Result.Val = APValue(APSInt(L->getValue(),
                              L->getType()->isUnsignedIntegerType()));
  IsConst = true;
  return true;
}

// This case should be rare, but we need to check it before we check on
// the type below.
if (Exp->getType().isNull()) {
  IsConst = false;
  return true;
}

// FIXME: Evaluating values of large array and record types can cause
// performance problems. Only do so in C++11 for now.
if (Exp->isRValue() && (Exp->getType()->isArrayType() ||
                        Exp->getType()->isRecordType()) &&
    !Ctx.getLangOpts().CPlusPlus11) {
  IsConst = false;
  return true;
}
return false;
13139}

13141static bool hasUnacceptableSideEffect(Expr::EvalStatus &Result,
                                    Expr::SideEffectsKind SEK) {
return (SEK < Expr::SE_AllowSideEffects && Result.HasSideEffects) ||
       (SEK < Expr::SE_AllowUndefinedBehavior && Result.HasUndefinedBehavior);
13145}

13147static bool EvaluateAsRValue(const Expr *E, Expr::EvalResult &Result,
                           const ASTContext &Ctx, EvalInfo &Info) {
bool IsConst;
if (FastEvaluateAsRValue(E, Result, Ctx, IsConst))
  return IsConst;

return EvaluateAsRValue(Info, E, Result.Val);
13154}

13156static bool EvaluateAsInt(const Expr *E, Expr::EvalResult &ExprResult,
                        const ASTContext &Ctx,
                        Expr::SideEffectsKind AllowSideEffects,
                        EvalInfo &Info) {
if (!E->getType()->isIntegralOrEnumerationType())
  return false;

if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info) ||
    !ExprResult.Val.isInt() ||
    hasUnacceptableSideEffect(ExprResult, AllowSideEffects))
  return false;

return true;
13169}

13171static bool EvaluateAsFixedPoint(const Expr *E, Expr::EvalResult &ExprResult,
                               const ASTContext &Ctx,
                               Expr::SideEffectsKind AllowSideEffects,
                               EvalInfo &Info) {
if (!E->getType()->isFixedPointType())
  return false;

if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info))
  return false;

if (!ExprResult.Val.isFixedPoint() ||
    hasUnacceptableSideEffect(ExprResult, AllowSideEffects))
  return false;

return true;
13186}

13188/// EvaluateAsRValue - Return true if this is a constant which we can fold using
13189/// any crazy technique (that has nothing to do with language standards) that
13190/// we want to.  If this function returns true, it returns the folded constant
13191/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion
13192/// will be applied to the result.
13193bool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx,
                          bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13196, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13196, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsRValue(this, Result, Ctx, Info);
13200}

13202bool Expr::EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx,
                                    bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13205, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13205, __PRETTY_FUNCTION__));
EvalResult Scratch;
return EvaluateAsRValue(Scratch, Ctx, InConstantContext) &&
       HandleConversionToBool(Scratch.Val, Result);
13209}

13211bool Expr::EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx,
                       SideEffectsKind AllowSideEffects,
                       bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13215, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13215, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsInt(this, Result, Ctx, AllowSideEffects, Info);
13219}

13221bool Expr::EvaluateAsFixedPoint(EvalResult &Result, const ASTContext &Ctx,
                              SideEffectsKind AllowSideEffects,
                              bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13225, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13225, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsFixedPoint(this, Result, Ctx, AllowSideEffects, Info);
13229}

13231bool Expr::EvaluateAsFloat(APFloat &Result, const ASTContext &Ctx,
                         SideEffectsKind AllowSideEffects,
                         bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13235, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13235, __PRETTY_FUNCTION__));

if (!getType()->isRealFloatingType())
  return false;

EvalResult ExprResult;
if (!EvaluateAsRValue(ExprResult, Ctx, InConstantContext) ||
    !ExprResult.Val.isFloat() ||
    hasUnacceptableSideEffect(ExprResult, AllowSideEffects))
  return false;

Result = ExprResult.Val.getFloat();
return true;
13248}

13250bool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx,
                          bool InConstantContext) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13253, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13253, __PRETTY_FUNCTION__));

EvalInfo Info(Ctx, Result, EvalInfo::EM_ConstantFold);
Info.InConstantContext = InConstantContext;
LValue LV;
CheckedTemporaries CheckedTemps;
if (!EvaluateLValue(this, LV, Info) || !Info.discardCleanups() ||
    Result.HasSideEffects ||
    !CheckLValueConstantExpression(Info, getExprLoc(),
                                   Ctx.getLValueReferenceType(getType()), LV,
                                   Expr::EvaluateForCodeGen, CheckedTemps))
  return false;

LV.moveInto(Result.Val);
return true;
13268}

13270bool Expr::EvaluateAsConstantExpr(EvalResult &Result, ConstExprUsage Usage,
                                const ASTContext &Ctx) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13273, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13273, __PRETTY_FUNCTION__));

EvalInfo::EvaluationMode EM = EvalInfo::EM_ConstantExpression;
EvalInfo Info(Ctx, Result, EM);
Info.InConstantContext = true;

if (!::Evaluate(Result.Val, Info, this) || Result.HasSideEffects)
  return false;

if (!Info.discardCleanups())
  llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13283);

return CheckConstantExpression(Info, getExprLoc(), getType(), Result.Val,
                               Usage) &&
       CheckMemoryLeaks(Info);
13288}

13290bool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx,
                               const VarDecl *VD,
                          SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13294, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13294, __PRETTY_FUNCTION__));

// FIXME: Evaluating initializers for large array and record types can cause
// performance problems. Only do so in C++11 for now.
if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) &&
    !Ctx.getLangOpts().CPlusPlus11)
  return false;

Expr::EvalStatus EStatus;
EStatus.Diag = &Notes;

EvalInfo Info(Ctx, EStatus, VD->isConstexpr()
                                    ? EvalInfo::EM_ConstantExpression
                                    : EvalInfo::EM_ConstantFold);
Info.setEvaluatingDecl(VD, Value);
Info.InConstantContext = true;

SourceLocation DeclLoc = VD->getLocation();
QualType DeclTy = VD->getType();

if (Info.EnableNewConstInterp) {
  auto &InterpCtx = const_cast<ASTContext &>(Ctx).getInterpContext();
  switch (InterpCtx.evaluateAsInitializer(Info, VD, Value)) {
  case interp::InterpResult::Fail:
    // Bail out if an error was encountered.
    return false;
  case interp::InterpResult::Success:
    // Evaluation succeeded and value was set.
    return CheckConstantExpression(Info, DeclLoc, DeclTy, Value);
  case interp::InterpResult::Bail:
    // Evaluate the value again for the tree evaluator to use.
    break;
  }
}

LValue LVal;
LVal.set(VD);

// C++11 [basic.start.init]p2:
//  Variables with static storage duration or thread storage duration shall be
//  zero-initialized before any other initialization takes place.
// This behavior is not present in C.
if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() &&
    !DeclTy->isReferenceType()) {
  ImplicitValueInitExpr VIE(DeclTy);
  if (!EvaluateInPlace(Value, Info, LVal, &VIE,
                       /*AllowNonLiteralTypes=*/true))
    return false;
}

if (!EvaluateInPlace(Value, Info, LVal, this,
                     /*AllowNonLiteralTypes=*/true) ||
    EStatus.HasSideEffects)
  return false;

// At this point, any lifetime-extended temporaries are completely
// initialized.
Info.performLifetimeExtension();

if (!Info.discardCleanups())
  llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13354);

return CheckConstantExpression(Info, DeclLoc, DeclTy, Value) &&
       CheckMemoryLeaks(Info);
13358}

13360bool VarDecl::evaluateDestruction(
  SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
assert(getEvaluatedValue() && !getEvaluatedValue()->isAbsent() &&((getEvaluatedValue() && !getEvaluatedValue()->isAbsent
() && "cannot evaluate destruction of non-constant-initialized variable"
) ? static_cast<void> (0) : __assert_fail ("getEvaluatedValue() && !getEvaluatedValue()->isAbsent() && \"cannot evaluate destruction of non-constant-initialized variable\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13363, __PRETTY_FUNCTION__))
       "cannot evaluate destruction of non-constant-initialized variable")((getEvaluatedValue() && !getEvaluatedValue()->isAbsent
() && "cannot evaluate destruction of non-constant-initialized variable"
) ? static_cast<void> (0) : __assert_fail ("getEvaluatedValue() && !getEvaluatedValue()->isAbsent() && \"cannot evaluate destruction of non-constant-initialized variable\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13363, __PRETTY_FUNCTION__));

Expr::EvalStatus EStatus;
EStatus.Diag = &Notes;

// Make a copy of the value for the destructor to mutate.
APValue DestroyedValue = *getEvaluatedValue();

EvalInfo Info(getASTContext(), EStatus, EvalInfo::EM_ConstantExpression);
Info.setEvaluatingDecl(this, DestroyedValue,
                       EvalInfo::EvaluatingDeclKind::Dtor);
Info.InConstantContext = true;

SourceLocation DeclLoc = getLocation();
QualType DeclTy = getType();

LValue LVal;
LVal.set(this);

// FIXME: Consider storing whether this variable has constant destruction in
// the EvaluatedStmt so that CodeGen can query it.
if (!HandleDestruction(Info, DeclLoc, LVal.Base, DestroyedValue, DeclTy) ||
    EStatus.HasSideEffects)
  return false;

if (!Info.discardCleanups())
  llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13389);

ensureEvaluatedStmt()->HasConstantDestruction = true;
return true;
13393}

13395/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
13396/// constant folded, but discard the result.
13397bool Expr::isEvaluatable(const ASTContext &Ctx, SideEffectsKind SEK) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13399, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13399, __PRETTY_FUNCTION__));

EvalResult Result;
return EvaluateAsRValue(Result, Ctx, /* in constant context */ true) &&
       !hasUnacceptableSideEffect(Result, SEK);
13404}

13406APSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx,
                  SmallVectorImpl<PartialDiagnosticAt> *Diag) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13409, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13409, __PRETTY_FUNCTION__));

EvalResult EVResult;
EVResult.Diag = Diag;
EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = true;

bool Result = ::EvaluateAsRValue(this, EVResult, Ctx, Info);
(void)Result;
assert(Result && "Could not evaluate expression")((Result && "Could not evaluate expression") ? static_cast
<void> (0) : __assert_fail ("Result && \"Could not evaluate expression\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13418, __PRETTY_FUNCTION__));
assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")((EVResult.Val.isInt() && "Expression did not evaluate to integer"
) ? static_cast<void> (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13419, __PRETTY_FUNCTION__));

return EVResult.Val.getInt();
13422}

13424APSInt Expr::EvaluateKnownConstIntCheckOverflow(
  const ASTContext &Ctx, SmallVectorImpl<PartialDiagnosticAt> *Diag) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13427, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13427, __PRETTY_FUNCTION__));

EvalResult EVResult;
EVResult.Diag = Diag;
EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = true;
Info.CheckingForUndefinedBehavior = true;

bool Result = ::EvaluateAsRValue(Info, this, EVResult.Val);
(void)Result;
assert(Result && "Could not evaluate expression")((Result && "Could not evaluate expression") ? static_cast
<void> (0) : __assert_fail ("Result && \"Could not evaluate expression\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13437, __PRETTY_FUNCTION__));
assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")((EVResult.Val.isInt() && "Expression did not evaluate to integer"
) ? static_cast<void> (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13438, __PRETTY_FUNCTION__));

return EVResult.Val.getInt();
13441}

13443void Expr::EvaluateForOverflow(const ASTContext &Ctx) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13445, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13445, __PRETTY_FUNCTION__));

bool IsConst;
EvalResult EVResult;
if (!FastEvaluateAsRValue(this, EVResult, Ctx, IsConst)) {
  EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects);
  Info.CheckingForUndefinedBehavior = true;
  (void)::EvaluateAsRValue(Info, this, EVResult.Val);
}
13454}

13456bool Expr::EvalResult::isGlobalLValue() const {
assert(Val.isLValue())((Val.isLValue()) ? static_cast<void> (0) : __assert_fail
 ("Val.isLValue()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13457, __PRETTY_FUNCTION__));
return IsGlobalLValue(Val.getLValueBase());
13459}


13462/// isIntegerConstantExpr - this recursive routine will test if an expression is
13463/// an integer constant expression.

13465/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
13466/// comma, etc

13468// CheckICE - This function does the fundamental ICE checking: the returned
13469// ICEDiag contains an ICEKind indicating whether the expression is an ICE,
13470// and a (possibly null) SourceLocation indicating the location of the problem.
13471//
13472// Note that to reduce code duplication, this helper does no evaluation
13473// itself; the caller checks whether the expression is evaluatable, and
13474// in the rare cases where CheckICE actually cares about the evaluated
13475// value, it calls into Evaluate.

13477namespace {

13479enum ICEKind {
/// This expression is an ICE.
IK_ICE,
/// This expression is not an ICE, but if it isn't evaluated, it's
/// a legal subexpression for an ICE. This return value is used to handle
/// the comma operator in C99 mode, and non-constant subexpressions.
IK_ICEIfUnevaluated,
/// This expression is not an ICE, and is not a legal subexpression for one.
IK_NotICE
13488};

13490struct ICEDiag {
ICEKind Kind;
SourceLocation Loc;

ICEDiag(ICEKind IK, SourceLocation l) : Kind(IK), Loc(l) {}
13495};

13497}

13499static ICEDiag NoDiag() { return ICEDiag(IK_ICE, SourceLocation()); }

13501static ICEDiag Worst(ICEDiag A, ICEDiag B) { return A.Kind >= B.Kind ? A : B; }

13503static ICEDiag CheckEvalInICE(const Expr* E, const ASTContext &Ctx) {
Expr::EvalResult EVResult;
Expr::EvalStatus Status;
EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression);

Info.InConstantContext = true;
if (!::EvaluateAsRValue(E, EVResult, Ctx, Info) || EVResult.HasSideEffects ||
    !EVResult.Val.isInt())
  return ICEDiag(IK_NotICE, E->getBeginLoc());

return NoDiag();
13514}

13516static ICEDiag CheckICE(const Expr* E, const ASTContext &Ctx) {
assert(!E->isValueDependent() && "Should not see value dependent exprs!")((!E->isValueDependent() && "Should not see value dependent exprs!"
) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Should not see value dependent exprs!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13517, __PRETTY_FUNCTION__));
if (!E->getType()->isIntegralOrEnumerationType())
  return ICEDiag(IK_NotICE, E->getBeginLoc());

switch (E->getStmtClass()) {
13522#define ABSTRACT_STMT(Node)
13523#define STMT(Node, Base) case Expr::Node##Class:
13524#define EXPR(Node, Base)
13525#include "clang/AST/StmtNodes.inc"
case Expr::PredefinedExprClass:
case Expr::FloatingLiteralClass:
case Expr::ImaginaryLiteralClass:
case Expr::StringLiteralClass:
case Expr::ArraySubscriptExprClass:
case Expr::OMPArraySectionExprClass:
case Expr::MemberExprClass:
case Expr::CompoundAssignOperatorClass:
case Expr::CompoundLiteralExprClass:
case Expr::ExtVectorElementExprClass:
case Expr::DesignatedInitExprClass:
case Expr::ArrayInitLoopExprClass:
case Expr::ArrayInitIndexExprClass:
case Expr::NoInitExprClass:
case Expr::DesignatedInitUpdateExprClass:
case Expr::ImplicitValueInitExprClass:
case Expr::ParenListExprClass:
case Expr::VAArgExprClass:
case Expr::AddrLabelExprClass:
case Expr::StmtExprClass:
case Expr::CXXMemberCallExprClass:
case Expr::CUDAKernelCallExprClass:
case Expr::CXXDynamicCastExprClass:
case Expr::CXXTypeidExprClass:
case Expr::CXXUuidofExprClass:
case Expr::MSPropertyRefExprClass:
case Expr::MSPropertySubscriptExprClass:
case Expr::CXXNullPtrLiteralExprClass:
case Expr::UserDefinedLiteralClass:
case Expr::CXXThisExprClass:
case Expr::CXXThrowExprClass:
case Expr::CXXNewExprClass:
case Expr::CXXDeleteExprClass:
case Expr::CXXPseudoDestructorExprClass:
case Expr::UnresolvedLookupExprClass:
case Expr::TypoExprClass:
case Expr::DependentScopeDeclRefExprClass:
case Expr::CXXConstructExprClass:
case Expr::CXXInheritedCtorInitExprClass:
case Expr::CXXStdInitializerListExprClass:
case Expr::CXXBindTemporaryExprClass:
case Expr::ExprWithCleanupsClass:
case Expr::CXXTemporaryObjectExprClass:
case Expr::CXXUnresolvedConstructExprClass:
case Expr::CXXDependentScopeMemberExprClass:
case Expr::UnresolvedMemberExprClass:
case Expr::ObjCStringLiteralClass:
case Expr::ObjCBoxedExprClass:
case Expr::ObjCArrayLiteralClass:
case Expr::ObjCDictionaryLiteralClass:
case Expr::ObjCEncodeExprClass:
case Expr::ObjCMessageExprClass:
case Expr::ObjCSelectorExprClass:
case Expr::ObjCProtocolExprClass:
case Expr::ObjCIvarRefExprClass:
case Expr::ObjCPropertyRefExprClass:
case Expr::ObjCSubscriptRefExprClass:
case Expr::ObjCIsaExprClass:
case Expr::ObjCAvailabilityCheckExprClass:
case Expr::ShuffleVectorExprClass:
case Expr::ConvertVectorExprClass:
case Expr::BlockExprClass:
case Expr::NoStmtClass:
case Expr::OpaqueValueExprClass:
case Expr::PackExpansionExprClass:
case Expr::SubstNonTypeTemplateParmPackExprClass:
case Expr::FunctionParmPackExprClass:
case Expr::AsTypeExprClass:
case Expr::ObjCIndirectCopyRestoreExprClass:
case Expr::MaterializeTemporaryExprClass:
case Expr::PseudoObjectExprClass:
case Expr::AtomicExprClass:
case Expr::LambdaExprClass:
case Expr::CXXFoldExprClass:
case Expr::CoawaitExprClass:
case Expr::DependentCoawaitExprClass:
case Expr::CoyieldExprClass:
  return ICEDiag(IK_NotICE, E->getBeginLoc());

case Expr::InitListExprClass: {
  // C++03 [dcl.init]p13: If T is a scalar type, then a declaration of the
  // form "T x = { a };" is equivalent to "T x = a;".
  // Unless we're initializing a reference, T is a scalar as it is known to be
  // of integral or enumeration type.
  if (E->isRValue())
    if (cast<InitListExpr>(E)->getNumInits() == 1)
      return CheckICE(cast<InitListExpr>(E)->getInit(0), Ctx);
  return ICEDiag(IK_NotICE, E->getBeginLoc());
}

case Expr::SizeOfPackExprClass:
case Expr::GNUNullExprClass:
case Expr::SourceLocExprClass:
  return NoDiag();

case Expr::SubstNonTypeTemplateParmExprClass:
  return
    CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx);

case Expr::ConstantExprClass:
  return CheckICE(cast<ConstantExpr>(E)->getSubExpr(), Ctx);

case Expr::ParenExprClass:
  return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx);
case Expr::GenericSelectionExprClass:
  return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx);
case Expr::IntegerLiteralClass:
case Expr::FixedPointLiteralClass:
case Expr::CharacterLiteralClass:
case Expr::ObjCBoolLiteralExprClass:
case Expr::CXXBoolLiteralExprClass:
case Expr::CXXScalarValueInitExprClass:
case Expr::TypeTraitExprClass:
case Expr::ArrayTypeTraitExprClass:
case Expr::ExpressionTraitExprClass:
case Expr::CXXNoexceptExprClass:
  return NoDiag();
case Expr::CallExprClass:
case Expr::CXXOperatorCallExprClass: {
  // C99 6.6/3 allows function calls within unevaluated subexpressions of
  // constant expressions, but they can never be ICEs because an ICE cannot
  // contain an operand of (pointer to) function type.
  const CallExpr *CE = cast<CallExpr>(E);
  if (CE->getBuiltinCallee())
    return CheckEvalInICE(E, Ctx);
  return ICEDiag(IK_NotICE, E->getBeginLoc());
}
case Expr::DeclRefExprClass: {
  if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl()))
    return NoDiag();
  const ValueDecl *D = cast<DeclRefExpr>(E)->getDecl();
  if (Ctx.getLangOpts().CPlusPlus &&
      D && IsConstNonVolatile(D->getType())) {
    // Parameter variables are never constants.  Without this check,
    // getAnyInitializer() can find a default argument, which leads
    // to chaos.
    if (isa<ParmVarDecl>(D))
      return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation());

    // C++ 7.1.5.1p2
    //   A variable of non-volatile const-qualified integral or enumeration
    //   type initialized by an ICE can be used in ICEs.
    if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) {
      if (!Dcl->getType()->isIntegralOrEnumerationType())
        return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation());

      const VarDecl *VD;
      // Look for a declaration of this variable that has an initializer, and
      // check whether it is an ICE.
      if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE())
        return NoDiag();
      else
        return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation());
    }
  }
  return ICEDiag(IK_NotICE, E->getBeginLoc());
}
case Expr::UnaryOperatorClass: {
  const UnaryOperator *Exp = cast<UnaryOperator>(E);
  switch (Exp->getOpcode()) {
  case UO_PostInc:
  case UO_PostDec:
  case UO_PreInc:
  case UO_PreDec:
  case UO_AddrOf:
  case UO_Deref:
  case UO_Coawait:
    // C99 6.6/3 allows increment and decrement within unevaluated
    // subexpressions of constant expressions, but they can never be ICEs
    // because an ICE cannot contain an lvalue operand.
    return ICEDiag(IK_NotICE, E->getBeginLoc());
  case UO_Extension:
  case UO_LNot:
  case UO_Plus:
  case UO_Minus:
  case UO_Not:
  case UO_Real:
  case UO_Imag:
    return CheckICE(Exp->getSubExpr(), Ctx);
  }
  llvm_unreachable("invalid unary operator class")::llvm::llvm_unreachable_internal("invalid unary operator class"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13706);
}
case Expr::OffsetOfExprClass: {
  // Note that per C99, offsetof must be an ICE. And AFAIK, using
  // EvaluateAsRValue matches the proposed gcc behavior for cases like
  // "offsetof(struct s{int x[4];}, x[1.0])".  This doesn't affect
  // compliance: we should warn earlier for offsetof expressions with
  // array subscripts that aren't ICEs, and if the array subscripts
  // are ICEs, the value of the offsetof must be an integer constant.
  return CheckEvalInICE(E, Ctx);
}
case Expr::UnaryExprOrTypeTraitExprClass: {
  const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E);
  if ((Exp->getKind() ==  UETT_SizeOf) &&
      Exp->getTypeOfArgument()->isVariableArrayType())
    return ICEDiag(IK_NotICE, E->getBeginLoc());
  return NoDiag();
}
case Expr::BinaryOperatorClass: {
  const BinaryOperator *Exp = cast<BinaryOperator>(E);
  switch (Exp->getOpcode()) {
  case BO_PtrMemD:
  case BO_PtrMemI:
  case BO_Assign:
  case BO_MulAssign:
  case BO_DivAssign:
  case BO_RemAssign:
  case BO_AddAssign:
  case BO_SubAssign:
  case BO_ShlAssign:
  case BO_ShrAssign:
  case BO_AndAssign:
  case BO_XorAssign:
  case BO_OrAssign:
    // C99 6.6/3 allows assignments within unevaluated subexpressions of
    // constant expressions, but they can never be ICEs because an ICE cannot
    // contain an lvalue operand.
    return ICEDiag(IK_NotICE, E->getBeginLoc());

  case BO_Mul:
  case BO_Div:
  case BO_Rem:
  case BO_Add:
  case BO_Sub:
  case BO_Shl:
  case BO_Shr:
  case BO_LT:
  case BO_GT:
  case BO_LE:
  case BO_GE:
  case BO_EQ:
  case BO_NE:
  case BO_And:
  case BO_Xor:
  case BO_Or:
  case BO_Comma:
  case BO_Cmp: {
    ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
    ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
    if (Exp->getOpcode() == BO_Div ||
        Exp->getOpcode() == BO_Rem) {
      // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure
      // we don't evaluate one.
      if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) {
        llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx);
        if (REval == 0)
          return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc());
        if (REval.isSigned() && REval.isAllOnesValue()) {
          llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx);
          if (LEval.isMinSignedValue())
            return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc());
        }
      }
    }
    if (Exp->getOpcode() == BO_Comma) {
      if (Ctx.getLangOpts().C99) {
        // C99 6.6p3 introduces a strange edge case: comma can be in an ICE
        // if it isn't evaluated.
        if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE)
          return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc());
      } else {
        // In both C89 and C++, commas in ICEs are illegal.
        return ICEDiag(IK_NotICE, E->getBeginLoc());
      }
    }
    return Worst(LHSResult, RHSResult);
  }
  case BO_LAnd:
  case BO_LOr: {
    ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
    ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
    if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICEIfUnevaluated) {
      // Rare case where the RHS has a comma "side-effect"; we need
      // to actually check the condition to see whether the side
      // with the comma is evaluated.
      if ((Exp->getOpcode() == BO_LAnd) !=
          (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0))
        return RHSResult;
      return NoDiag();
    }

    return Worst(LHSResult, RHSResult);
  }
  }
  llvm_unreachable("invalid binary operator kind")::llvm::llvm_unreachable_internal("invalid binary operator kind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13810);
}
case Expr::ImplicitCastExprClass:
case Expr::CStyleCastExprClass:
case Expr::CXXFunctionalCastExprClass:
case Expr::CXXStaticCastExprClass:
case Expr::CXXReinterpretCastExprClass:
case Expr::CXXConstCastExprClass:
case Expr::ObjCBridgedCastExprClass: {
  const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr();
  if (isa<ExplicitCastExpr>(E)) {
    if (const FloatingLiteral *FL
          = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) {
      unsigned DestWidth = Ctx.getIntWidth(E->getType());
      bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType();
      APSInt IgnoredVal(DestWidth, !DestSigned);
      bool Ignored;
      // If the value does not fit in the destination type, the behavior is
      // undefined, so we are not required to treat it as a constant
      // expression.
      if (FL->getValue().convertToInteger(IgnoredVal,
                                          llvm::APFloat::rmTowardZero,
                                          &Ignored) & APFloat::opInvalidOp)
        return ICEDiag(IK_NotICE, E->getBeginLoc());
      return NoDiag();
    }
  }
  switch (cast<CastExpr>(E)->getCastKind()) {
  case CK_LValueToRValue:
  case CK_AtomicToNonAtomic:
  case CK_NonAtomicToAtomic:
  case CK_NoOp:
  case CK_IntegralToBoolean:
  case CK_IntegralCast:
    return CheckICE(SubExpr, Ctx);
  default:
    return ICEDiag(IK_NotICE, E->getBeginLoc());
  }
}
case Expr::BinaryConditionalOperatorClass: {
  const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E);
  ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx);
  if (CommonResult.Kind == IK_NotICE) return CommonResult;
  ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);
  if (FalseResult.Kind == IK_NotICE) return FalseResult;
  if (CommonResult.Kind == IK_ICEIfUnevaluated) return CommonResult;
  if (FalseResult.Kind == IK_ICEIfUnevaluated &&
      Exp->getCommon()->EvaluateKnownConstInt(Ctx) != 0) return NoDiag();
  return FalseResult;
}
case Expr::ConditionalOperatorClass: {
  const ConditionalOperator *Exp = cast<ConditionalOperator>(E);
  // If the condition (ignoring parens) is a __builtin_constant_p call,
  // then only the true side is actually considered in an integer constant
  // expression, and it is fully evaluated.  This is an important GNU
  // extension.  See GCC PR38377 for discussion.
  if (const CallExpr *CallCE
      = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
    if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p)
      return CheckEvalInICE(E, Ctx);
  ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx);
  if (CondResult.Kind == IK_NotICE)
    return CondResult;

  ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx);
  ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);

  if (TrueResult.Kind == IK_NotICE)
    return TrueResult;
  if (FalseResult.Kind == IK_NotICE)
    return FalseResult;
  if (CondResult.Kind == IK_ICEIfUnevaluated)
    return CondResult;
  if (TrueResult.Kind == IK_ICE && FalseResult.Kind == IK_ICE)
    return NoDiag();
  // Rare case where the diagnostics depend on which side is evaluated
  // Note that if we get here, CondResult is 0, and at least one of
  // TrueResult and FalseResult is non-zero.
  if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0)
    return FalseResult;
  return TrueResult;
}
case Expr::CXXDefaultArgExprClass:
  return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx);
case Expr::CXXDefaultInitExprClass:
  return CheckICE(cast<CXXDefaultInitExpr>(E)->getExpr(), Ctx);
case Expr::ChooseExprClass: {
  return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(), Ctx);
}
case Expr::BuiltinBitCastExprClass: {
  if (!checkBitCastConstexprEligibility(nullptr, Ctx, cast<CastExpr>(E)))
    return ICEDiag(IK_NotICE, E->getBeginLoc());
  return CheckICE(cast<CastExpr>(E)->getSubExpr(), Ctx);
}
}

llvm_unreachable("Invalid StmtClass!")::llvm::llvm_unreachable_internal("Invalid StmtClass!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13906);
13907}

13909/// Evaluate an expression as a C++11 integral constant expression.
13910static bool EvaluateCPlusPlus11IntegralConstantExpr(const ASTContext &Ctx,
                                                  const Expr *E,
                                                  llvm::APSInt *Value,
                                                  SourceLocation *Loc) {
if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
  if (Loc) *Loc = E->getExprLoc();
  return false;
}

APValue Result;
if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc))
  return false;

if (!Result.isInt()) {
  if (Loc) *Loc = E->getExprLoc();
  return false;
}

if (Value) *Value = Result.getInt();
return true;
13930}

13932bool Expr::isIntegerConstantExpr(const ASTContext &Ctx,
                               SourceLocation *Loc) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13935, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13935, __PRETTY_FUNCTION__));

if (Ctx.getLangOpts().CPlusPlus11)
  return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, nullptr, Loc);

ICEDiag D = CheckICE(this, Ctx);
if (D.Kind != IK_ICE) {
  if (Loc) *Loc = D.Loc;
  return false;
}
return true;
13946}

13948bool Expr::isIntegerConstantExpr(llvm::APSInt &Value, const ASTContext &Ctx,
                               SourceLocation *Loc, bool isEvaluated) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13951, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13951, __PRETTY_FUNCTION__));

if (Ctx.getLangOpts().CPlusPlus11)
  return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc);

if (!isIntegerConstantExpr(Ctx, Loc))
  return false;

// The only possible side-effects here are due to UB discovered in the
// evaluation (for instance, INT_MAX + 1). In such a case, we are still
// required to treat the expression as an ICE, so we produce the folded
// value.
EvalResult ExprResult;
Expr::EvalStatus Status;
EvalInfo Info(Ctx, Status, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = true;

if (!::EvaluateAsInt(this, ExprResult, Ctx, SE_AllowSideEffects, Info))
  llvm_unreachable("ICE cannot be evaluated!")::llvm::llvm_unreachable_internal("ICE cannot be evaluated!",
 "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13969);

Value = ExprResult.Val.getInt();
return true;
13973}

13975bool Expr::isCXX98IntegralConstantExpr(const ASTContext &Ctx) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13977, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13977, __PRETTY_FUNCTION__));

return CheckICE(this, Ctx).Kind == IK_ICE;
13980}

13982bool Expr::isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result,
                             SourceLocation *Loc) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13985, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13985, __PRETTY_FUNCTION__));

// We support this checking in C++98 mode in order to diagnose compatibility
// issues.
assert(Ctx.getLangOpts().CPlusPlus)((Ctx.getLangOpts().CPlusPlus) ? static_cast<void> (0) :
 __assert_fail ("Ctx.getLangOpts().CPlusPlus", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 13989, __PRETTY_FUNCTION__));

// Build evaluation settings.
Expr::EvalStatus Status;
SmallVector<PartialDiagnosticAt, 8> Diags;
Status.Diag = &Diags;
EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression);

APValue Scratch;
bool IsConstExpr =
    ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch) &&
    // FIXME: We don't produce a diagnostic for this, but the callers that
    // call us on arbitrary full-expressions should generally not care.
    Info.discardCleanups() && !Status.HasSideEffects;

if (!Diags.empty()) {
  IsConstExpr = false;
  if (Loc) *Loc = Diags[0].first;
} else if (!IsConstExpr) {
  // FIXME: This shouldn't happen.
  if (Loc) *Loc = getExprLoc();
}

return IsConstExpr;
14013}

14015bool Expr::EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx,
                                  const FunctionDecl *Callee,
                                  ArrayRef<const Expr*> Args,
                                  const Expr *This) const {
assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14020, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14020, __PRETTY_FUNCTION__));

Expr::EvalStatus Status;
EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpressionUnevaluated);
Info.InConstantContext = true;

LValue ThisVal;
const LValue *ThisPtr = nullptr;
if (This) {
14029#ifndef NDEBUG
  auto *MD = dyn_cast<CXXMethodDecl>(Callee);
  assert(MD && "Don't provide `this` for non-methods.")((MD && "Don't provide `this` for non-methods.") ? static_cast
<void> (0) : __assert_fail ("MD && \"Don't provide `this` for non-methods.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14031, __PRETTY_FUNCTION__));
  assert(!MD->isStatic() && "Don't provide `this` for static methods.")((!MD->isStatic() && "Don't provide `this` for static methods."
) ? static_cast<void> (0) : __assert_fail ("!MD->isStatic() && \"Don't provide `this` for static methods.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14032, __PRETTY_FUNCTION__));
14033#endif
  if (EvaluateObjectArgument(Info, This, ThisVal))
    ThisPtr = &ThisVal;
  if (Info.EvalStatus.HasSideEffects)
    return false;
}

ArgVector ArgValues(Args.size());
for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end();
     I != E; ++I) {
  if ((*I)->isValueDependent() ||
      !Evaluate(ArgValues[I - Args.begin()], Info, *I))
    // If evaluation fails, throw away the argument entirely.
    ArgValues[I - Args.begin()] = APValue();
  if (Info.EvalStatus.HasSideEffects)
    return false;
}

// Build fake call to Callee.
CallStackFrame Frame(Info, Callee->getLocation(), Callee, ThisPtr,
                     ArgValues.data());
return Evaluate(Value, Info, this) && Info.discardCleanups() &&
       !Info.EvalStatus.HasSideEffects;
14056}

14058bool Expr::isPotentialConstantExpr(const FunctionDecl *FD,
                                 SmallVectorImpl<
                                   PartialDiagnosticAt> &Diags) {
// FIXME: It would be useful to check constexpr function templates, but at the
// moment the constant expression evaluator cannot cope with the non-rigorous
// ASTs which we build for dependent expressions.
if (FD->isDependentContext())
  return true;

Expr::EvalStatus Status;
Status.Diag = &Diags;

EvalInfo Info(FD->getASTContext(), Status, EvalInfo::EM_ConstantExpression);
Info.InConstantContext = true;
Info.CheckingPotentialConstantExpression = true;

// The constexpr VM attempts to compile all methods to bytecode here.
if (Info.EnableNewConstInterp) {
  auto &InterpCtx = Info.Ctx.getInterpContext();
  switch (InterpCtx.isPotentialConstantExpr(Info, FD)) {
  case interp::InterpResult::Success:
  case interp::InterpResult::Fail:
    return Diags.empty();
  case interp::InterpResult::Bail:
    break;
  }
}

const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : nullptr;

// Fabricate an arbitrary expression on the stack and pretend that it
// is a temporary being used as the 'this' pointer.
LValue This;
ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy);
This.set({&VIE, Info.CurrentCall->Index});

ArrayRef<const Expr*> Args;

APValue Scratch;
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) {
  // Evaluate the call as a constant initializer, to allow the construction
  // of objects of non-literal types.
  Info.setEvaluatingDecl(This.getLValueBase(), Scratch);
  HandleConstructorCall(&VIE, This, Args, CD, Info, Scratch);
} else {
  SourceLocation Loc = FD->getLocation();
  HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : nullptr,
                     Args, FD->getBody(), Info, Scratch, nullptr);
}

return Diags.empty();
14110}

14112bool Expr::isPotentialConstantExprUnevaluated(Expr *E,
                                            const FunctionDecl *FD,
                                            SmallVectorImpl<
                                              PartialDiagnosticAt> &Diags) {
assert(!E->isValueDependent() &&((!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14117, __PRETTY_FUNCTION__))
       "Expression evaluator can't be called on a dependent expression.")((!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression."
) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14117, __PRETTY_FUNCTION__));

Expr::EvalStatus Status;
Status.Diag = &Diags;

EvalInfo Info(FD->getASTContext(), Status,
              EvalInfo::EM_ConstantExpressionUnevaluated);
Info.InConstantContext = true;
Info.CheckingPotentialConstantExpression = true;

// Fabricate a call stack frame to give the arguments a plausible cover story.
ArrayRef<const Expr*> Args;
ArgVector ArgValues(0);
bool Success = EvaluateArgs(Args, ArgValues, Info, FD);
(void)Success;
assert(Success &&((Success && "Failed to set up arguments for potential constant evaluation"
) ? static_cast<void> (0) : __assert_fail ("Success && \"Failed to set up arguments for potential constant evaluation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14133, __PRETTY_FUNCTION__))
       "Failed to set up arguments for potential constant evaluation")((Success && "Failed to set up arguments for potential constant evaluation"
) ? static_cast<void> (0) : __assert_fail ("Success && \"Failed to set up arguments for potential constant evaluation\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/AST/ExprConstant.cpp"
, 14133, __PRETTY_FUNCTION__));
CallStackFrame Frame(Info, SourceLocation(), FD, nullptr, ArgValues.data());

APValue ResultScratch;
Evaluate(ResultScratch, Info, E);
return Diags.empty();
14139}

14141bool Expr::tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx,
                               unsigned Type) const {
if (!getType()->isPointerType())
  return false;

Expr::EvalStatus Status;
EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantFold);
return tryEvaluateBuiltinObjectSize(this, Type, Info, Result);
14149}

←

/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h

→

1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines the Expr interface and subclasses.
10//
11//===----------------------------------------------------------------------===//

13#ifndef LLVM_CLANG_AST_EXPR_H
14#define LLVM_CLANG_AST_EXPR_H

16#include "clang/AST/APValue.h"
17#include "clang/AST/ASTVector.h"
18#include "clang/AST/Decl.h"
19#include "clang/AST/DeclAccessPair.h"
20#include "clang/AST/OperationKinds.h"
21#include "clang/AST/Stmt.h"
22#include "clang/AST/TemplateBase.h"
23#include "clang/AST/Type.h"
24#include "clang/Basic/CharInfo.h"
25#include "clang/Basic/FixedPoint.h"
26#include "clang/Basic/LangOptions.h"
27#include "clang/Basic/SyncScope.h"
28#include "clang/Basic/TypeTraits.h"
29#include "llvm/ADT/APFloat.h"
30#include "llvm/ADT/APSInt.h"
31#include "llvm/ADT/iterator.h"
32#include "llvm/ADT/iterator_range.h"
33#include "llvm/ADT/SmallVector.h"
34#include "llvm/ADT/StringRef.h"
35#include "llvm/Support/AtomicOrdering.h"
36#include "llvm/Support/Compiler.h"
37#include "llvm/Support/TrailingObjects.h"

39namespace clang {
class APValue;
class ASTContext;
class BlockDecl;
class CXXBaseSpecifier;
class CXXMemberCallExpr;
class CXXOperatorCallExpr;
class CastExpr;
class Decl;
class IdentifierInfo;
class MaterializeTemporaryExpr;
class NamedDecl;
class ObjCPropertyRefExpr;
class OpaqueValueExpr;
class ParmVarDecl;
class StringLiteral;
class TargetInfo;
class ValueDecl;

58/// A simple array of base specifiers.
59typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;

61/// An adjustment to be made to the temporary created when emitting a
62/// reference binding, which accesses a particular subobject of that temporary.
63struct SubobjectAdjustment {
enum {
  DerivedToBaseAdjustment,
  FieldAdjustment,
  MemberPointerAdjustment
} Kind;

struct DTB {
  const CastExpr *BasePath;
  const CXXRecordDecl *DerivedClass;
};

struct P {
  const MemberPointerType *MPT;
  Expr *RHS;
};

union {
  struct DTB DerivedToBase;
  FieldDecl *Field;
  struct P Ptr;
};

SubobjectAdjustment(const CastExpr *BasePath,
                    const CXXRecordDecl *DerivedClass)
  : Kind(DerivedToBaseAdjustment) {
  DerivedToBase.BasePath = BasePath;
  DerivedToBase.DerivedClass = DerivedClass;
}

SubobjectAdjustment(FieldDecl *Field)
  : Kind(FieldAdjustment) {
  this->Field = Field;
}

SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS)
  : Kind(MemberPointerAdjustment) {
  this->Ptr.MPT = MPT;
  this->Ptr.RHS = RHS;
}
103};

105/// This represents one expression.  Note that Expr's are subclasses of Stmt.
106/// This allows an expression to be transparently used any place a Stmt is
107/// required.
108class Expr : public ValueStmt {
QualType TR;

111public:
Expr() = delete;
Expr(const Expr&) = delete;
Expr(Expr &&) = delete;
Expr &operator=(const Expr&) = delete;
Expr &operator=(Expr&&) = delete;

118protected:
Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK,
     bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack)
  : ValueStmt(SC)
{
  ExprBits.TypeDependent = TD;
  ExprBits.ValueDependent = VD;
  ExprBits.InstantiationDependent = ID;
  ExprBits.ValueKind = VK;
  ExprBits.ObjectKind = OK;
  assert(ExprBits.ObjectKind == OK && "truncated kind")((ExprBits.ObjectKind == OK && "truncated kind") ? static_cast
<void> (0) : __assert_fail ("ExprBits.ObjectKind == OK && \"truncated kind\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 128, __PRETTY_FUNCTION__));
  ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
  setType(T);
}

/// Construct an empty expression.
explicit Expr(StmtClass SC, EmptyShell) : ValueStmt(SC) { }

136public:
QualType getType() const { return TR; }
void setType(QualType t) {
  // In C++, the type of an expression is always adjusted so that it
  // will not have reference type (C++ [expr]p6). Use
  // QualType::getNonReferenceType() to retrieve the non-reference
  // type. Additionally, inspect Expr::isLvalue to determine whether
  // an expression that is adjusted in this manner should be
  // considered an lvalue.
  assert((t.isNull() || !t->isReferenceType()) &&(((t.isNull() || !t->isReferenceType()) && "Expressions can't have reference type"
) ? static_cast<void> (0) : __assert_fail ("(t.isNull() || !t->isReferenceType()) && \"Expressions can't have reference type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 146, __PRETTY_FUNCTION__))
         "Expressions can't have reference type")(((t.isNull() || !t->isReferenceType()) && "Expressions can't have reference type"
) ? static_cast<void> (0) : __assert_fail ("(t.isNull() || !t->isReferenceType()) && \"Expressions can't have reference type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 146, __PRETTY_FUNCTION__));

  TR = t;
}

/// isValueDependent - Determines whether this expression is
/// value-dependent (C++ [temp.dep.constexpr]). For example, the
/// array bound of "Chars" in the following example is
/// value-dependent.
/// @code
/// template<int Size, char (&Chars)[Size]> struct meta_string;
/// @endcode
bool isValueDependent() const { return ExprBits.ValueDependent; }

/// Set whether this expression is value-dependent or not.
void setValueDependent(bool VD) {
  ExprBits.ValueDependent = VD;
}

/// isTypeDependent - Determines whether this expression is
/// type-dependent (C++ [temp.dep.expr]), which means that its type
/// could change from one template instantiation to the next. For
/// example, the expressions "x" and "x + y" are type-dependent in
/// the following code, but "y" is not type-dependent:
/// @code
/// template<typename T>
/// void add(T x, int y) {
///   x + y;
/// }
/// @endcode
bool isTypeDependent() const { return ExprBits.TypeDependent; }

/// Set whether this expression is type-dependent or not.
void setTypeDependent(bool TD) {
  ExprBits.TypeDependent = TD;
}

/// Whether this expression is instantiation-dependent, meaning that
/// it depends in some way on a template parameter, even if neither its type
/// nor (constant) value can change due to the template instantiation.
///
/// In the following example, the expression \c sizeof(sizeof(T() + T())) is
/// instantiation-dependent (since it involves a template parameter \c T), but
/// is neither type- nor value-dependent, since the type of the inner
/// \c sizeof is known (\c std::size_t) and therefore the size of the outer
/// \c sizeof is known.
///
/// \code
/// template<typename T>
/// void f(T x, T y) {
///   sizeof(sizeof(T() + T());
/// }
/// \endcode
///
bool isInstantiationDependent() const {
  return ExprBits.InstantiationDependent;
}

/// Set whether this expression is instantiation-dependent or not.
void setInstantiationDependent(bool ID) {
  ExprBits.InstantiationDependent = ID;
}

/// Whether this expression contains an unexpanded parameter
/// pack (for C++11 variadic templates).
///
/// Given the following function template:
///
/// \code
/// template<typename F, typename ...Types>
/// void forward(const F &f, Types &&...args) {
///   f(static_cast<Types&&>(args)...);
/// }
/// \endcode
///
/// The expressions \c args and \c static_cast<Types&&>(args) both
/// contain parameter packs.
bool containsUnexpandedParameterPack() const {
  return ExprBits.ContainsUnexpandedParameterPack;
}

/// Set the bit that describes whether this expression
/// contains an unexpanded parameter pack.
void setContainsUnexpandedParameterPack(bool PP = true) {
  ExprBits.ContainsUnexpandedParameterPack = PP;
}

/// getExprLoc - Return the preferred location for the arrow when diagnosing
/// a problem with a generic expression.
SourceLocation getExprLoc() const LLVM_READONLY__attribute__((__pure__));

/// isUnusedResultAWarning - Return true if this immediate expression should
/// be warned about if the result is unused.  If so, fill in expr, location,
/// and ranges with expr to warn on and source locations/ranges appropriate
/// for a warning.
bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc,
                            SourceRange &R1, SourceRange &R2,
                            ASTContext &Ctx) const;

/// isLValue - True if this expression is an "l-value" according to
/// the rules of the current language.  C and C++ give somewhat
/// different rules for this concept, but in general, the result of
/// an l-value expression identifies a specific object whereas the
/// result of an r-value expression is a value detached from any
/// specific storage.
///
/// C++11 divides the concept of "r-value" into pure r-values
/// ("pr-values") and so-called expiring values ("x-values"), which
/// identify specific objects that can be safely cannibalized for
/// their resources.  This is an unfortunate abuse of terminology on
/// the part of the C++ committee.  In Clang, when we say "r-value",
/// we generally mean a pr-value.
bool isLValue() const { return getValueKind() == VK_LValue; }
bool isRValue() const { return getValueKind() == VK_RValue; }
bool isXValue() const { return getValueKind() == VK_XValue; }
bool isGLValue() const { return getValueKind() != VK_RValue; }

enum LValueClassification {
  LV_Valid,
  LV_NotObjectType,
  LV_IncompleteVoidType,
  LV_DuplicateVectorComponents,
  LV_InvalidExpression,
  LV_InvalidMessageExpression,
  LV_MemberFunction,
  LV_SubObjCPropertySetting,
  LV_ClassTemporary,
  LV_ArrayTemporary
};
/// Reasons why an expression might not be an l-value.
LValueClassification ClassifyLValue(ASTContext &Ctx) const;

enum isModifiableLvalueResult {
  MLV_Valid,
  MLV_NotObjectType,
  MLV_IncompleteVoidType,
  MLV_DuplicateVectorComponents,
  MLV_InvalidExpression,
  MLV_LValueCast,           // Specialized form of MLV_InvalidExpression.
  MLV_IncompleteType,
  MLV_ConstQualified,
  MLV_ConstQualifiedField,
  MLV_ConstAddrSpace,
  MLV_ArrayType,
  MLV_NoSetterProperty,
  MLV_MemberFunction,
  MLV_SubObjCPropertySetting,
  MLV_InvalidMessageExpression,
  MLV_ClassTemporary,
  MLV_ArrayTemporary
};
/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
/// does not have an incomplete type, does not have a const-qualified type,
/// and if it is a structure or union, does not have any member (including,
/// recursively, any member or element of all contained aggregates or unions)
/// with a const-qualified type.
///
/// \param Loc [in,out] - A source location which *may* be filled
/// in with the location of the expression making this a
/// non-modifiable lvalue, if specified.
isModifiableLvalueResult
isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc = nullptr) const;

/// The return type of classify(). Represents the C++11 expression
///        taxonomy.
class Classification {
public:
  /// The various classification results. Most of these mean prvalue.
  enum Kinds {
    CL_LValue,
    CL_XValue,
    CL_Function, // Functions cannot be lvalues in C.
    CL_Void, // Void cannot be an lvalue in C.
    CL_AddressableVoid, // Void expression whose address can be taken in C.
    CL_DuplicateVectorComponents, // A vector shuffle with dupes.
    CL_MemberFunction, // An expression referring to a member function
    CL_SubObjCPropertySetting,
    CL_ClassTemporary, // A temporary of class type, or subobject thereof.
    CL_ArrayTemporary, // A temporary of array type.
    CL_ObjCMessageRValue, // ObjC message is an rvalue
    CL_PRValue // A prvalue for any other reason, of any other type
  };
  /// The results of modification testing.
  enum ModifiableType {
    CM_Untested, // testModifiable was false.
    CM_Modifiable,
    CM_RValue, // Not modifiable because it's an rvalue
    CM_Function, // Not modifiable because it's a function; C++ only
    CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext
    CM_NoSetterProperty,// Implicit assignment to ObjC property without setter
    CM_ConstQualified,
    CM_ConstQualifiedField,
    CM_ConstAddrSpace,
    CM_ArrayType,
    CM_IncompleteType
  };

private:
  friend class Expr;

  unsigned short Kind;
  unsigned short Modifiable;

  explicit Classification(Kinds k, ModifiableType m)
    : Kind(k), Modifiable(m)
  {}

public:
  Classification() {}

  Kinds getKind() const { return static_cast<Kinds>(Kind); }
  ModifiableType getModifiable() const {
    assert(Modifiable != CM_Untested && "Did not test for modifiability.")((Modifiable != CM_Untested && "Did not test for modifiability."
) ? static_cast<void> (0) : __assert_fail ("Modifiable != CM_Untested && \"Did not test for modifiability.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 358, __PRETTY_FUNCTION__));
    return static_cast<ModifiableType>(Modifiable);
  }
  bool isLValue() const { return Kind == CL_LValue; }
  bool isXValue() const { return Kind == CL_XValue; }
  bool isGLValue() const { return Kind <= CL_XValue; }
  bool isPRValue() const { return Kind >= CL_Function; }
  bool isRValue() const { return Kind >= CL_XValue; }
  bool isModifiable() const { return getModifiable() == CM_Modifiable; }

  /// Create a simple, modifiably lvalue
  static Classification makeSimpleLValue() {
    return Classification(CL_LValue, CM_Modifiable);
  }

};
/// Classify - Classify this expression according to the C++11
///        expression taxonomy.
///
/// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the
/// old lvalue vs rvalue. This function determines the type of expression this
/// is. There are three expression types:
/// - lvalues are classical lvalues as in C++03.
/// - prvalues are equivalent to rvalues in C++03.
/// - xvalues are expressions yielding unnamed rvalue references, e.g. a
///   function returning an rvalue reference.
/// lvalues and xvalues are collectively referred to as glvalues, while
/// prvalues and xvalues together form rvalues.
Classification Classify(ASTContext &Ctx) const {
  return ClassifyImpl(Ctx, nullptr);
}

/// ClassifyModifiable - Classify this expression according to the
///        C++11 expression taxonomy, and see if it is valid on the left side
///        of an assignment.
///
/// This function extends classify in that it also tests whether the
/// expression is modifiable (C99 6.3.2.1p1).
/// \param Loc A source location that might be filled with a relevant location
///            if the expression is not modifiable.
Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{
  return ClassifyImpl(Ctx, &Loc);
}

/// getValueKindForType - Given a formal return or parameter type,
/// give its value kind.
static ExprValueKind getValueKindForType(QualType T) {
  if (const ReferenceType *RT = T->getAs<ReferenceType>())
    return (isa<LValueReferenceType>(RT)
              ? VK_LValue
              : (RT->getPointeeType()->isFunctionType()
                   ? VK_LValue : VK_XValue));
  return VK_RValue;
}

/// getValueKind - The value kind that this expression produces.
ExprValueKind getValueKind() const {
  return static_cast<ExprValueKind>(ExprBits.ValueKind);
}

/// getObjectKind - The object kind that this expression produces.
/// Object kinds are meaningful only for expressions that yield an
/// l-value or x-value.
ExprObjectKind getObjectKind() const {
  return static_cast<ExprObjectKind>(ExprBits.ObjectKind);
}

bool isOrdinaryOrBitFieldObject() const {
  ExprObjectKind OK = getObjectKind();
  return (OK == OK_Ordinary || OK == OK_BitField);
}

/// setValueKind - Set the value kind produced by this expression.
void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; }

/// setObjectKind - Set the object kind produced by this expression.
void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; }

436private:
Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const;

439public:

/// Returns true if this expression is a gl-value that
/// potentially refers to a bit-field.
///
/// In C++, whether a gl-value refers to a bitfield is essentially
/// an aspect of the value-kind type system.
bool refersToBitField() const { return getObjectKind() == OK_BitField; }

/// If this expression refers to a bit-field, retrieve the
/// declaration of that bit-field.
///
/// Note that this returns a non-null pointer in subtly different
/// places than refersToBitField returns true.  In particular, this can
/// return a non-null pointer even for r-values loaded from
/// bit-fields, but it will return null for a conditional bit-field.
FieldDecl *getSourceBitField();

const FieldDecl *getSourceBitField() const {
  return const_cast<Expr*>(this)->getSourceBitField();
}

Decl *getReferencedDeclOfCallee();
const Decl *getReferencedDeclOfCallee() const {
  return const_cast<Expr*>(this)->getReferencedDeclOfCallee();
}

/// If this expression is an l-value for an Objective C
/// property, find the underlying property reference expression.
const ObjCPropertyRefExpr *getObjCProperty() const;

/// Check if this expression is the ObjC 'self' implicit parameter.
bool isObjCSelfExpr() const;

/// Returns whether this expression refers to a vector element.
bool refersToVectorElement() const;

/// Returns whether this expression refers to a global register
/// variable.
bool refersToGlobalRegisterVar() const;

/// Returns whether this expression has a placeholder type.
bool hasPlaceholderType() const {
  return getType()->isPlaceholderType();
}

/// Returns whether this expression has a specific placeholder type.
bool hasPlaceholderType(BuiltinType::Kind K) const {
  assert(BuiltinType::isPlaceholderTypeKind(K))((BuiltinType::isPlaceholderTypeKind(K)) ? static_cast<void
> (0) : __assert_fail ("BuiltinType::isPlaceholderTypeKind(K)"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 487, __PRETTY_FUNCTION__));
  if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType()))
    return BT->getKind() == K;
  return false;
}

/// isKnownToHaveBooleanValue - Return true if this is an integer expression
/// that is known to return 0 or 1.  This happens for _Bool/bool expressions
/// but also int expressions which are produced by things like comparisons in
/// C.
bool isKnownToHaveBooleanValue() const;

/// isIntegerConstantExpr - Return true if this expression is a valid integer
/// constant expression, and, if so, return its value in Result.  If not a
/// valid i-c-e, return false and fill in Loc (if specified) with the location
/// of the invalid expression.
///
/// Note: This does not perform the implicit conversions required by C++11
/// [expr.const]p5.
bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx,
                           SourceLocation *Loc = nullptr,
                           bool isEvaluated = true) const;
bool isIntegerConstantExpr(const ASTContext &Ctx,
                           SourceLocation *Loc = nullptr) const;

/// isCXX98IntegralConstantExpr - Return true if this expression is an
/// integral constant expression in C++98. Can only be used in C++.
bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const;

/// isCXX11ConstantExpr - Return true if this expression is a constant
/// expression in C++11. Can only be used in C++.
///
/// Note: This does not perform the implicit conversions required by C++11
/// [expr.const]p5.
bool isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result = nullptr,
                         SourceLocation *Loc = nullptr) const;

/// isPotentialConstantExpr - Return true if this function's definition
/// might be usable in a constant expression in C++11, if it were marked
/// constexpr. Return false if the function can never produce a constant
/// expression, along with diagnostics describing why not.
static bool isPotentialConstantExpr(const FunctionDecl *FD,
                                    SmallVectorImpl<
                                      PartialDiagnosticAt> &Diags);

/// isPotentialConstantExprUnevaluted - Return true if this expression might
/// be usable in a constant expression in C++11 in an unevaluated context, if
/// it were in function FD marked constexpr. Return false if the function can
/// never produce a constant expression, along with diagnostics describing
/// why not.
static bool isPotentialConstantExprUnevaluated(Expr *E,
                                               const FunctionDecl *FD,
                                               SmallVectorImpl<
                                                 PartialDiagnosticAt> &Diags);

/// isConstantInitializer - Returns true if this expression can be emitted to
/// IR as a constant, and thus can be used as a constant initializer in C.
/// If this expression is not constant and Culprit is non-null,
/// it is used to store the address of first non constant expr.
bool isConstantInitializer(ASTContext &Ctx, bool ForRef,
                           const Expr **Culprit = nullptr) const;

/// EvalStatus is a struct with detailed info about an evaluation in progress.
struct EvalStatus {
  /// Whether the evaluated expression has side effects.
  /// For example, (f() && 0) can be folded, but it still has side effects.
  bool HasSideEffects;

  /// Whether the evaluation hit undefined behavior.
  /// For example, 1.0 / 0.0 can be folded to Inf, but has undefined behavior.
  /// Likewise, INT_MAX + 1 can be folded to INT_MIN, but has UB.
  bool HasUndefinedBehavior;

  /// Diag - If this is non-null, it will be filled in with a stack of notes
  /// indicating why evaluation failed (or why it failed to produce a constant
  /// expression).
  /// If the expression is unfoldable, the notes will indicate why it's not
  /// foldable. If the expression is foldable, but not a constant expression,
  /// the notes will describes why it isn't a constant expression. If the
  /// expression *is* a constant expression, no notes will be produced.
  SmallVectorImpl<PartialDiagnosticAt> *Diag;

  EvalStatus()
      : HasSideEffects(false), HasUndefinedBehavior(false), Diag(nullptr) {}

  // hasSideEffects - Return true if the evaluated expression has
  // side effects.
  bool hasSideEffects() const {
    return HasSideEffects;
  }
};

/// EvalResult is a struct with detailed info about an evaluated expression.
struct EvalResult : EvalStatus {
  /// Val - This is the value the expression can be folded to.
  APValue Val;

  // isGlobalLValue - Return true if the evaluated lvalue expression
  // is global.
  bool isGlobalLValue() const;
};

/// EvaluateAsRValue - Return true if this is a constant which we can fold to
/// an rvalue using any crazy technique (that has nothing to do with language
/// standards) that we want to, even if the expression has side-effects. If
/// this function returns true, it returns the folded constant in Result. If
/// the expression is a glvalue, an lvalue-to-rvalue conversion will be
/// applied.
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx,
                      bool InConstantContext = false) const;

/// EvaluateAsBooleanCondition - Return true if this is a constant
/// which we can fold and convert to a boolean condition using
/// any crazy technique that we want to, even if the expression has
/// side-effects.
bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx,
                                bool InConstantContext = false) const;

enum SideEffectsKind {
  SE_NoSideEffects,          ///< Strictly evaluate the expression.
  SE_AllowUndefinedBehavior, ///< Allow UB that we can give a value, but not
                             ///< arbitrary unmodeled side effects.
  SE_AllowSideEffects        ///< Allow any unmodeled side effect.
};

/// EvaluateAsInt - Return true if this is a constant which we can fold and
/// convert to an integer, using any crazy technique that we want to.
bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx,
                   SideEffectsKind AllowSideEffects = SE_NoSideEffects,
                   bool InConstantContext = false) const;

/// EvaluateAsFloat - Return true if this is a constant which we can fold and
/// convert to a floating point value, using any crazy technique that we
/// want to.
bool EvaluateAsFloat(llvm::APFloat &Result, const ASTContext &Ctx,
                     SideEffectsKind AllowSideEffects = SE_NoSideEffects,
                     bool InConstantContext = false) const;

/// EvaluateAsFloat - Return true if this is a constant which we can fold and
/// convert to a fixed point value.
bool EvaluateAsFixedPoint(EvalResult &Result, const ASTContext &Ctx,
                          SideEffectsKind AllowSideEffects = SE_NoSideEffects,
                          bool InConstantContext = false) const;

/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
/// constant folded without side-effects, but discard the result.
bool isEvaluatable(const ASTContext &Ctx,
                   SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;

/// HasSideEffects - This routine returns true for all those expressions
/// which have any effect other than producing a value. Example is a function
/// call, volatile variable read, or throwing an exception. If
/// IncludePossibleEffects is false, this call treats certain expressions with
/// potential side effects (such as function call-like expressions,
/// instantiation-dependent expressions, or invocations from a macro) as not
/// having side effects.
bool HasSideEffects(const ASTContext &Ctx,
                    bool IncludePossibleEffects = true) const;

/// Determine whether this expression involves a call to any function
/// that is not trivial.
bool hasNonTrivialCall(const ASTContext &Ctx) const;

/// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded
/// integer. This must be called on an expression that constant folds to an
/// integer.
llvm::APSInt EvaluateKnownConstInt(
    const ASTContext &Ctx,
    SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const;

llvm::APSInt EvaluateKnownConstIntCheckOverflow(
    const ASTContext &Ctx,
    SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const;

void EvaluateForOverflow(const ASTContext &Ctx) const;

/// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an
/// lvalue with link time known address, with no side-effects.
bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx,
                      bool InConstantContext = false) const;

/// EvaluateAsInitializer - Evaluate an expression as if it were the
/// initializer of the given declaration. Returns true if the initializer
/// can be folded to a constant, and produces any relevant notes. In C++11,
/// notes will be produced if the expression is not a constant expression.
bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx,
                           const VarDecl *VD,
                           SmallVectorImpl<PartialDiagnosticAt> &Notes) const;

/// EvaluateWithSubstitution - Evaluate an expression as if from the context
/// of a call to the given function with the given arguments, inside an
/// unevaluated context. Returns true if the expression could be folded to a
/// constant.
bool EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx,
                              const FunctionDecl *Callee,
                              ArrayRef<const Expr*> Args,
                              const Expr *This = nullptr) const;

/// Indicates how the constant expression will be used.
enum ConstExprUsage { EvaluateForCodeGen, EvaluateForMangling };

/// Evaluate an expression that is required to be a constant expression.
bool EvaluateAsConstantExpr(EvalResult &Result, ConstExprUsage Usage,
                            const ASTContext &Ctx) const;

/// If the current Expr is a pointer, this will try to statically
/// determine the number of bytes available where the pointer is pointing.
/// Returns true if all of the above holds and we were able to figure out the
/// size, false otherwise.
///
/// \param Type - How to evaluate the size of the Expr, as defined by the
/// "type" parameter of __builtin_object_size
bool tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx,
                           unsigned Type) const;

/// Enumeration used to describe the kind of Null pointer constant
/// returned from \c isNullPointerConstant().
enum NullPointerConstantKind {
  /// Expression is not a Null pointer constant.
  NPCK_NotNull = 0,

  /// Expression is a Null pointer constant built from a zero integer
  /// expression that is not a simple, possibly parenthesized, zero literal.
  /// C++ Core Issue 903 will classify these expressions as "not pointers"
  /// once it is adopted.
  /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903
  NPCK_ZeroExpression,

  /// Expression is a Null pointer constant built from a literal zero.
  NPCK_ZeroLiteral,

  /// Expression is a C++11 nullptr.
  NPCK_CXX11_nullptr,

  /// Expression is a GNU-style __null constant.
  NPCK_GNUNull
};

/// Enumeration used to describe how \c isNullPointerConstant()
/// should cope with value-dependent expressions.
enum NullPointerConstantValueDependence {
  /// Specifies that the expression should never be value-dependent.
  NPC_NeverValueDependent = 0,

  /// Specifies that a value-dependent expression of integral or
  /// dependent type should be considered a null pointer constant.
  NPC_ValueDependentIsNull,

  /// Specifies that a value-dependent expression should be considered
  /// to never be a null pointer constant.
  NPC_ValueDependentIsNotNull
};

/// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to
/// a Null pointer constant. The return value can further distinguish the
/// kind of NULL pointer constant that was detected.
NullPointerConstantKind isNullPointerConstant(
    ASTContext &Ctx,
    NullPointerConstantValueDependence NPC) const;

/// isOBJCGCCandidate - Return true if this expression may be used in a read/
/// write barrier.
bool isOBJCGCCandidate(ASTContext &Ctx) const;

/// Returns true if this expression is a bound member function.
bool isBoundMemberFunction(ASTContext &Ctx) const;

/// Given an expression of bound-member type, find the type
/// of the member.  Returns null if this is an *overloaded* bound
/// member expression.
static QualType findBoundMemberType(const Expr *expr);

/// Skip past any implicit casts which might surround this expression until
/// reaching a fixed point. Skips:
/// * ImplicitCastExpr
/// * FullExpr
Expr *IgnoreImpCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreImpCasts() const {
  return const_cast<Expr *>(this)->IgnoreImpCasts();
}

/// Skip past any casts which might surround this expression until reaching
/// a fixed point. Skips:
/// * CastExpr
/// * FullExpr
/// * MaterializeTemporaryExpr
/// * SubstNonTypeTemplateParmExpr
Expr *IgnoreCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreCasts() const {
  return const_cast<Expr *>(this)->IgnoreCasts();
}

/// Skip past any implicit AST nodes which might surround this expression
/// until reaching a fixed point. Skips:
/// * What IgnoreImpCasts() skips
/// * MaterializeTemporaryExpr
/// * CXXBindTemporaryExpr
Expr *IgnoreImplicit() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreImplicit() const {
  return const_cast<Expr *>(this)->IgnoreImplicit();
}

/// Skip past any parentheses which might surround this expression until
/// reaching a fixed point. Skips:
/// * ParenExpr
/// * UnaryOperator if `UO_Extension`
/// * GenericSelectionExpr if `!isResultDependent()`
/// * ChooseExpr if `!isConditionDependent()`
/// * ConstantExpr
Expr *IgnoreParens() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreParens() const {
  return const_cast<Expr *>(this)->IgnoreParens();
}

/// Skip past any parentheses and implicit casts which might surround this
/// expression until reaching a fixed point.
/// FIXME: IgnoreParenImpCasts really ought to be equivalent to
/// IgnoreParens() + IgnoreImpCasts() until reaching a fixed point. However
/// this is currently not the case. Instead IgnoreParenImpCasts() skips:
/// * What IgnoreParens() skips
/// * What IgnoreImpCasts() skips
/// * MaterializeTemporaryExpr
/// * SubstNonTypeTemplateParmExpr
Expr *IgnoreParenImpCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreParenImpCasts() const {
  return const_cast<Expr *>(this)->IgnoreParenImpCasts();
}

/// Skip past any parentheses and casts which might surround this expression
/// until reaching a fixed point. Skips:
/// * What IgnoreParens() skips
/// * What IgnoreCasts() skips
Expr *IgnoreParenCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreParenCasts() const {
  return const_cast<Expr *>(this)->IgnoreParenCasts();
}

/// Skip conversion operators. If this Expr is a call to a conversion
/// operator, return the argument.
Expr *IgnoreConversionOperator() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreConversionOperator() const {
  return const_cast<Expr *>(this)->IgnoreConversionOperator();
}

/// Skip past any parentheses and lvalue casts which might surround this
/// expression until reaching a fixed point. Skips:
/// * What IgnoreParens() skips
/// * What IgnoreCasts() skips, except that only lvalue-to-rvalue
///   casts are skipped
/// FIXME: This is intended purely as a temporary workaround for code
/// that hasn't yet been rewritten to do the right thing about those
/// casts, and may disappear along with the last internal use.
Expr *IgnoreParenLValueCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreParenLValueCasts() const {
  return const_cast<Expr *>(this)->IgnoreParenLValueCasts();
}

/// Skip past any parenthese and casts which do not change the value
/// (including ptr->int casts of the same size) until reaching a fixed point.
/// Skips:
/// * What IgnoreParens() skips
/// * CastExpr which do not change the value
/// * SubstNonTypeTemplateParmExpr
Expr *IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY__attribute__((__pure__));
const Expr *IgnoreParenNoopCasts(const ASTContext &Ctx) const {
  return const_cast<Expr *>(this)->IgnoreParenNoopCasts(Ctx);
}

/// Skip past any parentheses and derived-to-base casts until reaching a
/// fixed point. Skips:
/// * What IgnoreParens() skips
/// * CastExpr which represent a derived-to-base cast (CK_DerivedToBase,
///   CK_UncheckedDerivedToBase and CK_NoOp)
Expr *ignoreParenBaseCasts() LLVM_READONLY__attribute__((__pure__));
const Expr *ignoreParenBaseCasts() const {
  return const_cast<Expr *>(this)->ignoreParenBaseCasts();
}

/// Determine whether this expression is a default function argument.
///
/// Default arguments are implicitly generated in the abstract syntax tree
/// by semantic analysis for function calls, object constructions, etc. in
/// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes;
/// this routine also looks through any implicit casts to determine whether
/// the expression is a default argument.
bool isDefaultArgument() const;

/// Determine whether the result of this expression is a
/// temporary object of the given class type.
bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const;

/// Whether this expression is an implicit reference to 'this' in C++.
bool isImplicitCXXThis() const;

static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs);

/// For an expression of class type or pointer to class type,
/// return the most derived class decl the expression is known to refer to.
///
/// If this expression is a cast, this method looks through it to find the
/// most derived decl that can be inferred from the expression.
/// This is valid because derived-to-base conversions have undefined
/// behavior if the object isn't dynamically of the derived type.
const CXXRecordDecl *getBestDynamicClassType() const;

/// Get the inner expression that determines the best dynamic class.
/// If this is a prvalue, we guarantee that it is of the most-derived type
/// for the object itself.
const Expr *getBestDynamicClassTypeExpr() const;

/// Walk outwards from an expression we want to bind a reference to and
/// find the expression whose lifetime needs to be extended. Record
/// the LHSs of comma expressions and adjustments needed along the path.
const Expr *skipRValueSubobjectAdjustments(
    SmallVectorImpl<const Expr *> &CommaLHS,
    SmallVectorImpl<SubobjectAdjustment> &Adjustments) const;
const Expr *skipRValueSubobjectAdjustments() const {
  SmallVector<const Expr *, 8> CommaLHSs;
  SmallVector<SubobjectAdjustment, 8> Adjustments;
  return skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
}

/// Checks that the two Expr's will refer to the same value as a comparison
/// operand.  The caller must ensure that the values referenced by the Expr's
/// are not modified between E1 and E2 or the result my be invalid.
static bool isSameComparisonOperand(const Expr* E1, const Expr* E2);

static bool classof(const Stmt *T) {
  return T->getStmtClass() >= firstExprConstant &&
         T->getStmtClass() <= lastExprConstant;
}
918};

920//===----------------------------------------------------------------------===//
921// Wrapper Expressions.
922//===----------------------------------------------------------------------===//

924/// FullExpr - Represents a "full-expression" node.
925class FullExpr : public Expr {
926protected:
Stmt *SubExpr;

FullExpr(StmtClass SC, Expr *subexpr)
  : Expr(SC, subexpr->getType(),
         subexpr->getValueKind(), subexpr->getObjectKind(),
         subexpr->isTypeDependent(), subexpr->isValueDependent(),
         subexpr->isInstantiationDependent(),
         subexpr->containsUnexpandedParameterPack()), SubExpr(subexpr) {}
FullExpr(StmtClass SC, EmptyShell Empty)
  : Expr(SC, Empty) {}
937public:
const Expr *getSubExpr() const { return cast<Expr>(SubExpr); }
Expr *getSubExpr() { return cast<Expr>(SubExpr); }

/// As with any mutator of the AST, be very careful when modifying an
/// existing AST to preserve its invariants.
void setSubExpr(Expr *E) { SubExpr = E; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() >= firstFullExprConstant &&
         T->getStmtClass() <= lastFullExprConstant;
}
949};

951/// ConstantExpr - An expression that occurs in a constant context and
952/// optionally the result of evaluating the expression.
953class ConstantExpr final
  : public FullExpr,
    private llvm::TrailingObjects<ConstantExpr, APValue, uint64_t> {
static_assert(std::is_same<uint64_t, llvm::APInt::WordType>::value,
              "this class assumes llvm::APInt::WordType is uint64_t for "
              "trail-allocated storage");

960public:
/// Describes the kind of result that can be trail-allocated.
enum ResultStorageKind { RSK_None, RSK_Int64, RSK_APValue };

964private:
size_t numTrailingObjects(OverloadToken<APValue>) const {
  return ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue;
}
size_t numTrailingObjects(OverloadToken<uint64_t>) const {
  return ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64;
}

void DefaultInit(ResultStorageKind StorageKind);
uint64_t &Int64Result() {
  assert(ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 &&((ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 &&
 "invalid accessor") ? static_cast<void> (0) : __assert_fail
 ("ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 && \"invalid accessor\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 975, __PRETTY_FUNCTION__))
         "invalid accessor")((ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 &&
 "invalid accessor") ? static_cast<void> (0) : __assert_fail
 ("ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 && \"invalid accessor\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 975, __PRETTY_FUNCTION__));
  return *getTrailingObjects<uint64_t>();
}
const uint64_t &Int64Result() const {
  return const_cast<ConstantExpr *>(this)->Int64Result();
}
APValue &APValueResult() {
  assert(ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue &&((ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue &&
 "invalid accessor") ? static_cast<void> (0) : __assert_fail
 ("ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue && \"invalid accessor\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 983, __PRETTY_FUNCTION__))
         "invalid accessor")((ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue &&
 "invalid accessor") ? static_cast<void> (0) : __assert_fail
 ("ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue && \"invalid accessor\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 983, __PRETTY_FUNCTION__));
  return *getTrailingObjects<APValue>();
}
const APValue &APValueResult() const {
  return const_cast<ConstantExpr *>(this)->APValueResult();
}

ConstantExpr(Expr *subexpr, ResultStorageKind StorageKind);
ConstantExpr(ResultStorageKind StorageKind, EmptyShell Empty);

993public:
friend TrailingObjects;
friend class ASTStmtReader;
friend class ASTStmtWriter;
static ConstantExpr *Create(const ASTContext &Context, Expr *E,
                            const APValue &Result);
static ConstantExpr *Create(const ASTContext &Context, Expr *E,
                            ResultStorageKind Storage = RSK_None);
static ConstantExpr *CreateEmpty(const ASTContext &Context,
                                 ResultStorageKind StorageKind,
                                 EmptyShell Empty);

static ResultStorageKind getStorageKind(const APValue &Value);
static ResultStorageKind getStorageKind(const Type *T,
                                        const ASTContext &Context);

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return SubExpr->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return SubExpr->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ConstantExprClass;
}

void SetResult(APValue Value, const ASTContext &Context) {
  MoveIntoResult(Value, Context);
}
void MoveIntoResult(APValue &Value, const ASTContext &Context);

APValue::ValueKind getResultAPValueKind() const {
  return static_cast<APValue::ValueKind>(ConstantExprBits.APValueKind);
}
ResultStorageKind getResultStorageKind() const {
  return static_cast<ResultStorageKind>(ConstantExprBits.ResultKind);
}
APValue getAPValueResult() const;
const APValue &getResultAsAPValue() const { return APValueResult(); }
llvm::APSInt getResultAsAPSInt() const;
// Iterators
child_range children() { return child_range(&SubExpr, &SubExpr+1); }
const_child_range children() const {
  return const_child_range(&SubExpr, &SubExpr + 1);
}
1039};

1041//===----------------------------------------------------------------------===//
1042// Primary Expressions.
1043//===----------------------------------------------------------------------===//

1045/// OpaqueValueExpr - An expression referring to an opaque object of a
1046/// fixed type and value class.  These don't correspond to concrete
1047/// syntax; instead they're used to express operations (usually copy
1048/// operations) on values whose source is generally obvious from
1049/// context.
1050class OpaqueValueExpr : public Expr {
friend class ASTStmtReader;
Expr *SourceExpr;

1054public:
OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK,
                ExprObjectKind OK = OK_Ordinary,
                Expr *SourceExpr = nullptr)
  : Expr(OpaqueValueExprClass, T, VK, OK,
         T->isDependentType() ||
         (SourceExpr && SourceExpr->isTypeDependent()),
         T->isDependentType() ||
         (SourceExpr && SourceExpr->isValueDependent()),
         T->isInstantiationDependentType() ||
         (SourceExpr && SourceExpr->isInstantiationDependent()),
         false),
    SourceExpr(SourceExpr) {
  setIsUnique(false);
  OpaqueValueExprBits.Loc = Loc;
}

/// Given an expression which invokes a copy constructor --- i.e.  a
/// CXXConstructExpr, possibly wrapped in an ExprWithCleanups ---
/// find the OpaqueValueExpr that's the source of the construction.
static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr);

explicit OpaqueValueExpr(EmptyShell Empty)
  : Expr(OpaqueValueExprClass, Empty) {}

/// Retrieve the location of this expression.
SourceLocation getLocation() const { return OpaqueValueExprBits.Loc; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceExpr ? SourceExpr->getBeginLoc() : getLocation();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceExpr ? SourceExpr->getEndLoc() : getLocation();
}
SourceLocation getExprLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceExpr ? SourceExpr->getExprLoc() : getLocation();
}

child_range children() {
  return child_range(child_iterator(), child_iterator());
}

const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}

/// The source expression of an opaque value expression is the
/// expression which originally generated the value.  This is
/// provided as a convenience for analyses that don't wish to
/// precisely model the execution behavior of the program.
///
/// The source expression is typically set when building the
/// expression which binds the opaque value expression in the first
/// place.
Expr *getSourceExpr() const { return SourceExpr; }

void setIsUnique(bool V) {
  assert((!V || SourceExpr) &&(((!V || SourceExpr) && "unique OVEs are expected to have source expressions"
) ? static_cast<void> (0) : __assert_fail ("(!V || SourceExpr) && \"unique OVEs are expected to have source expressions\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1112, __PRETTY_FUNCTION__))
         "unique OVEs are expected to have source expressions")(((!V || SourceExpr) && "unique OVEs are expected to have source expressions"
) ? static_cast<void> (0) : __assert_fail ("(!V || SourceExpr) && \"unique OVEs are expected to have source expressions\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1112, __PRETTY_FUNCTION__));
  OpaqueValueExprBits.IsUnique = V;
}

bool isUnique() const { return OpaqueValueExprBits.IsUnique; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == OpaqueValueExprClass;
}
1121};

1123/// A reference to a declared variable, function, enum, etc.
1124/// [C99 6.5.1p2]
1125///
1126/// This encodes all the information about how a declaration is referenced
1127/// within an expression.
1128///
1129/// There are several optional constructs attached to DeclRefExprs only when
1130/// they apply in order to conserve memory. These are laid out past the end of
1131/// the object, and flags in the DeclRefExprBitfield track whether they exist:
1132///
1133///   DeclRefExprBits.HasQualifier:
1134///       Specifies when this declaration reference expression has a C++
1135///       nested-name-specifier.
1136///   DeclRefExprBits.HasFoundDecl:
1137///       Specifies when this declaration reference expression has a record of
1138///       a NamedDecl (different from the referenced ValueDecl) which was found
1139///       during name lookup and/or overload resolution.
1140///   DeclRefExprBits.HasTemplateKWAndArgsInfo:
1141///       Specifies when this declaration reference expression has an explicit
1142///       C++ template keyword and/or template argument list.
1143///   DeclRefExprBits.RefersToEnclosingVariableOrCapture
1144///       Specifies when this declaration reference expression (validly)
1145///       refers to an enclosed local or a captured variable.
1146class DeclRefExpr final
  : public Expr,
    private llvm::TrailingObjects<DeclRefExpr, NestedNameSpecifierLoc,
                                  NamedDecl *, ASTTemplateKWAndArgsInfo,
                                  TemplateArgumentLoc> {
friend class ASTStmtReader;
friend class ASTStmtWriter;
friend TrailingObjects;

/// The declaration that we are referencing.
ValueDecl *D;

/// Provides source/type location info for the declaration name
/// embedded in D.
DeclarationNameLoc DNLoc;

size_t numTrailingObjects(OverloadToken<NestedNameSpecifierLoc>) const {
  return hasQualifier();
}

size_t numTrailingObjects(OverloadToken<NamedDecl *>) const {
  return hasFoundDecl();
}

size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
  return hasTemplateKWAndArgsInfo();
}

/// Test whether there is a distinct FoundDecl attached to the end of
/// this DRE.
bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; }

DeclRefExpr(const ASTContext &Ctx, NestedNameSpecifierLoc QualifierLoc,
            SourceLocation TemplateKWLoc, ValueDecl *D,
            bool RefersToEnlosingVariableOrCapture,
            const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
            const TemplateArgumentListInfo *TemplateArgs, QualType T,
            ExprValueKind VK, NonOdrUseReason NOUR);

/// Construct an empty declaration reference expression.
explicit DeclRefExpr(EmptyShell Empty) : Expr(DeclRefExprClass, Empty) {}

/// Computes the type- and value-dependence flags for this
/// declaration reference expression.
void computeDependence(const ASTContext &Ctx);

1192public:
DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
            bool RefersToEnclosingVariableOrCapture, QualType T,
            ExprValueKind VK, SourceLocation L,
            const DeclarationNameLoc &LocInfo = DeclarationNameLoc(),
            NonOdrUseReason NOUR = NOUR_None);

static DeclRefExpr *
Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
       SourceLocation TemplateKWLoc, ValueDecl *D,
       bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc,
       QualType T, ExprValueKind VK, NamedDecl *FoundD = nullptr,
       const TemplateArgumentListInfo *TemplateArgs = nullptr,
       NonOdrUseReason NOUR = NOUR_None);

static DeclRefExpr *
Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
       SourceLocation TemplateKWLoc, ValueDecl *D,
       bool RefersToEnclosingVariableOrCapture,
       const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK,
       NamedDecl *FoundD = nullptr,
       const TemplateArgumentListInfo *TemplateArgs = nullptr,
       NonOdrUseReason NOUR = NOUR_None);

/// Construct an empty declaration reference expression.
static DeclRefExpr *CreateEmpty(const ASTContext &Context, bool HasQualifier,
                                bool HasFoundDecl,
                                bool HasTemplateKWAndArgsInfo,
                                unsigned NumTemplateArgs);

ValueDecl *getDecl() { return D; }
const ValueDecl *getDecl() const { return D; }
void setDecl(ValueDecl *NewD) { D = NewD; }

DeclarationNameInfo getNameInfo() const {
  return DeclarationNameInfo(getDecl()->getDeclName(), getLocation(), DNLoc);
}

SourceLocation getLocation() const { return DeclRefExprBits.Loc; }
void setLocation(SourceLocation L) { DeclRefExprBits.Loc = L; }
SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

/// Determine whether this declaration reference was preceded by a
/// C++ nested-name-specifier, e.g., \c N::foo.
bool hasQualifier() const { return DeclRefExprBits.HasQualifier; }

/// If the name was qualified, retrieves the nested-name-specifier
/// that precedes the name, with source-location information.
NestedNameSpecifierLoc getQualifierLoc() const {
  if (!hasQualifier())
    return NestedNameSpecifierLoc();
  return *getTrailingObjects<NestedNameSpecifierLoc>();
}

/// If the name was qualified, retrieves the nested-name-specifier
/// that precedes the name. Otherwise, returns NULL.
NestedNameSpecifier *getQualifier() const {
  return getQualifierLoc().getNestedNameSpecifier();
}

/// Get the NamedDecl through which this reference occurred.
///
/// This Decl may be different from the ValueDecl actually referred to in the
/// presence of using declarations, etc. It always returns non-NULL, and may
/// simple return the ValueDecl when appropriate.

NamedDecl *getFoundDecl() {
  return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
}

/// Get the NamedDecl through which this reference occurred.
/// See non-const variant.
const NamedDecl *getFoundDecl() const {
  return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
}

bool hasTemplateKWAndArgsInfo() const {
  return DeclRefExprBits.HasTemplateKWAndArgsInfo;
}

/// Retrieve the location of the template keyword preceding
/// this name, if any.
SourceLocation getTemplateKeywordLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
}

/// Retrieve the location of the left angle bracket starting the
/// explicit template argument list following the name, if any.
SourceLocation getLAngleLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
}

/// Retrieve the location of the right angle bracket ending the
/// explicit template argument list following the name, if any.
SourceLocation getRAngleLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
}

/// Determines whether the name in this declaration reference
/// was preceded by the template keyword.
bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }

/// Determines whether this declaration reference was followed by an
/// explicit template argument list.
bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }

/// Copies the template arguments (if present) into the given
/// structure.
void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
  if (hasExplicitTemplateArgs())
    getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
        getTrailingObjects<TemplateArgumentLoc>(), List);
}

/// Retrieve the template arguments provided as part of this
/// template-id.
const TemplateArgumentLoc *getTemplateArgs() const {
  if (!hasExplicitTemplateArgs())
    return nullptr;
  return getTrailingObjects<TemplateArgumentLoc>();
}

/// Retrieve the number of template arguments provided as part of this
/// template-id.
unsigned getNumTemplateArgs() const {
  if (!hasExplicitTemplateArgs())
    return 0;
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
}

ArrayRef<TemplateArgumentLoc> template_arguments() const {
  return {getTemplateArgs(), getNumTemplateArgs()};
}

/// Returns true if this expression refers to a function that
/// was resolved from an overloaded set having size greater than 1.
bool hadMultipleCandidates() const {
  return DeclRefExprBits.HadMultipleCandidates;
}
/// Sets the flag telling whether this expression refers to
/// a function that was resolved from an overloaded set having size
/// greater than 1.
void setHadMultipleCandidates(bool V = true) {
  DeclRefExprBits.HadMultipleCandidates = V;
}

/// Is this expression a non-odr-use reference, and if so, why?
NonOdrUseReason isNonOdrUse() const {
  return static_cast<NonOdrUseReason>(DeclRefExprBits.NonOdrUseReason);
}

/// Does this DeclRefExpr refer to an enclosing local or a captured
/// variable?
bool refersToEnclosingVariableOrCapture() const {
  return DeclRefExprBits.RefersToEnclosingVariableOrCapture;
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == DeclRefExprClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}

const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1368};

1370/// Used by IntegerLiteral/FloatingLiteral to store the numeric without
1371/// leaking memory.
1372///
1373/// For large floats/integers, APFloat/APInt will allocate memory from the heap
1374/// to represent these numbers.  Unfortunately, when we use a BumpPtrAllocator
1375/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with
1376/// the APFloat/APInt values will never get freed. APNumericStorage uses
1377/// ASTContext's allocator for memory allocation.
1378class APNumericStorage {
union {
  uint64_t VAL;    ///< Used to store the <= 64 bits integer value.
  uint64_t *pVal;  ///< Used to store the >64 bits integer value.
};
unsigned BitWidth;

bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }

APNumericStorage(const APNumericStorage &) = delete;
void operator=(const APNumericStorage &) = delete;

1390protected:
APNumericStorage() : VAL(0), BitWidth(0) { }

llvm::APInt getIntValue() const {
  unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
  if (NumWords > 1)
    return llvm::APInt(BitWidth, NumWords, pVal);
  else
    return llvm::APInt(BitWidth, VAL);
}
void setIntValue(const ASTContext &C, const llvm::APInt &Val);
1401};

1403class APIntStorage : private APNumericStorage {
1404public:
llvm::APInt getValue() const { return getIntValue(); }
void setValue(const ASTContext &C, const llvm::APInt &Val) {
  setIntValue(C, Val);
}
1409};

1411class APFloatStorage : private APNumericStorage {
1412public:
llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const {
  return llvm::APFloat(Semantics, getIntValue());
}
void setValue(const ASTContext &C, const llvm::APFloat &Val) {
  setIntValue(C, Val.bitcastToAPInt());
}
1419};

1421class IntegerLiteral : public Expr, public APIntStorage {
SourceLocation Loc;

/// Construct an empty integer literal.
explicit IntegerLiteral(EmptyShell Empty)
  : Expr(IntegerLiteralClass, Empty) { }

1428public:
// type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy,
// or UnsignedLongLongTy
IntegerLiteral(const ASTContext &C, const llvm::APInt &V, QualType type,
               SourceLocation l);

/// Returns a new integer literal with value 'V' and type 'type'.
/// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy,
/// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V
/// \param V - the value that the returned integer literal contains.
static IntegerLiteral *Create(const ASTContext &C, const llvm::APInt &V,
                              QualType type, SourceLocation l);
/// Returns a new empty integer literal.
static IntegerLiteral *Create(const ASTContext &C, EmptyShell Empty);

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }

/// Retrieve the location of the literal.
SourceLocation getLocation() const { return Loc; }

void setLocation(SourceLocation Location) { Loc = Location; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == IntegerLiteralClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1462};

1464class FixedPointLiteral : public Expr, public APIntStorage {
SourceLocation Loc;
unsigned Scale;

/// \brief Construct an empty integer literal.
explicit FixedPointLiteral(EmptyShell Empty)
    : Expr(FixedPointLiteralClass, Empty) {}

public:
FixedPointLiteral(const ASTContext &C, const llvm::APInt &V, QualType type,
                  SourceLocation l, unsigned Scale);

// Store the int as is without any bit shifting.
static FixedPointLiteral *CreateFromRawInt(const ASTContext &C,
                                           const llvm::APInt &V,
                                           QualType type, SourceLocation l,
                                           unsigned Scale);

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }

/// \brief Retrieve the location of the literal.
SourceLocation getLocation() const { return Loc; }

void setLocation(SourceLocation Location) { Loc = Location; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == FixedPointLiteralClass;
}

std::string getValueAsString(unsigned Radix) const;

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1503};

1505class CharacterLiteral : public Expr {
1506public:
enum CharacterKind {
  Ascii,
  Wide,
  UTF8,
  UTF16,
  UTF32
};

1515private:
unsigned Value;
SourceLocation Loc;
1518public:
// type should be IntTy
CharacterLiteral(unsigned value, CharacterKind kind, QualType type,
                 SourceLocation l)
  : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
         false, false),
    Value(value), Loc(l) {
  CharacterLiteralBits.Kind = kind;
}

/// Construct an empty character literal.
CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { }

SourceLocation getLocation() const { return Loc; }
CharacterKind getKind() const {
  return static_cast<CharacterKind>(CharacterLiteralBits.Kind);
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }

unsigned getValue() const { return Value; }

void setLocation(SourceLocation Location) { Loc = Location; }
void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; }
void setValue(unsigned Val) { Value = Val; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == CharacterLiteralClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1556};

1558class FloatingLiteral : public Expr, private APFloatStorage {
SourceLocation Loc;

FloatingLiteral(const ASTContext &C, const llvm::APFloat &V, bool isexact,
                QualType Type, SourceLocation L);

/// Construct an empty floating-point literal.
explicit FloatingLiteral(const ASTContext &C, EmptyShell Empty);

1567public:
static FloatingLiteral *Create(const ASTContext &C, const llvm::APFloat &V,
                               bool isexact, QualType Type, SourceLocation L);
static FloatingLiteral *Create(const ASTContext &C, EmptyShell Empty);

llvm::APFloat getValue() const {
  return APFloatStorage::getValue(getSemantics());
}
void setValue(const ASTContext &C, const llvm::APFloat &Val) {
  assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics")((&getSemantics() == &Val.getSemantics() && "Inconsistent semantics"
) ? static_cast<void> (0) : __assert_fail ("&getSemantics() == &Val.getSemantics() && \"Inconsistent semantics\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1576, __PRETTY_FUNCTION__));
  APFloatStorage::setValue(C, Val);
}

/// Get a raw enumeration value representing the floating-point semantics of
/// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
llvm::APFloatBase::Semantics getRawSemantics() const {
  return static_cast<llvm::APFloatBase::Semantics>(
      FloatingLiteralBits.Semantics);
}

/// Set the raw enumeration value representing the floating-point semantics of
/// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
void setRawSemantics(llvm::APFloatBase::Semantics Sem) {
  FloatingLiteralBits.Semantics = Sem;
}

/// Return the APFloat semantics this literal uses.
const llvm::fltSemantics &getSemantics() const {
  return llvm::APFloatBase::EnumToSemantics(
      static_cast<llvm::APFloatBase::Semantics>(
          FloatingLiteralBits.Semantics));
}

/// Set the APFloat semantics this literal uses.
void setSemantics(const llvm::fltSemantics &Sem) {
  FloatingLiteralBits.Semantics = llvm::APFloatBase::SemanticsToEnum(Sem);
}

bool isExact() const { return FloatingLiteralBits.IsExact; }
void setExact(bool E) { FloatingLiteralBits.IsExact = E; }

/// getValueAsApproximateDouble - This returns the value as an inaccurate
/// double.  Note that this may cause loss of precision, but is useful for
/// debugging dumps, etc.
double getValueAsApproximateDouble() const;

SourceLocation getLocation() const { return Loc; }
void setLocation(SourceLocation L) { Loc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Loc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == FloatingLiteralClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1630};

1632/// ImaginaryLiteral - We support imaginary integer and floating point literals,
1633/// like "1.0i".  We represent these as a wrapper around FloatingLiteral and
1634/// IntegerLiteral classes.  Instances of this class always have a Complex type
1635/// whose element type matches the subexpression.
1636///
1637class ImaginaryLiteral : public Expr {
Stmt *Val;
1639public:
ImaginaryLiteral(Expr *val, QualType Ty)
  : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false,
         false, false),
    Val(val) {}

/// Build an empty imaginary literal.
explicit ImaginaryLiteral(EmptyShell Empty)
  : Expr(ImaginaryLiteralClass, Empty) { }

const Expr *getSubExpr() const { return cast<Expr>(Val); }
Expr *getSubExpr() { return cast<Expr>(Val); }
void setSubExpr(Expr *E) { Val = E; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return Val->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Val->getEndLoc(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ImaginaryLiteralClass;
}

// Iterators
child_range children() { return child_range(&Val, &Val+1); }
const_child_range children() const {
  return const_child_range(&Val, &Val + 1);
}
1667};

1669/// StringLiteral - This represents a string literal expression, e.g. "foo"
1670/// or L"bar" (wide strings). The actual string data can be obtained with
1671/// getBytes() and is NOT null-terminated. The length of the string data is
1672/// determined by calling getByteLength().
1673///
1674/// The C type for a string is always a ConstantArrayType. In C++, the char
1675/// type is const qualified, in C it is not.
1676///
1677/// Note that strings in C can be formed by concatenation of multiple string
1678/// literal pptokens in translation phase #6. This keeps track of the locations
1679/// of each of these pieces.
1680///
1681/// Strings in C can also be truncated and extended by assigning into arrays,
1682/// e.g. with constructs like:
1683///   char X[2] = "foobar";
1684/// In this case, getByteLength() will return 6, but the string literal will
1685/// have type "char[2]".
1686class StringLiteral final
  : public Expr,
    private llvm::TrailingObjects<StringLiteral, unsigned, SourceLocation,
                                  char> {
friend class ASTStmtReader;
friend TrailingObjects;

/// StringLiteral is followed by several trailing objects. They are in order:
///
/// * A single unsigned storing the length in characters of this string. The
///   length in bytes is this length times the width of a single character.
///   Always present and stored as a trailing objects because storing it in
///   StringLiteral would increase the size of StringLiteral by sizeof(void *)
///   due to alignment requirements. If you add some data to StringLiteral,
///   consider moving it inside StringLiteral.
///
/// * An array of getNumConcatenated() SourceLocation, one for each of the
///   token this string is made of.
///
/// * An array of getByteLength() char used to store the string data.

1707public:
enum StringKind { Ascii, Wide, UTF8, UTF16, UTF32 };

1710private:
unsigned numTrailingObjects(OverloadToken<unsigned>) const { return 1; }
unsigned numTrailingObjects(OverloadToken<SourceLocation>) const {
  return getNumConcatenated();
}

unsigned numTrailingObjects(OverloadToken<char>) const {
  return getByteLength();
}

char *getStrDataAsChar() { return getTrailingObjects<char>(); }
const char *getStrDataAsChar() const { return getTrailingObjects<char>(); }

const uint16_t *getStrDataAsUInt16() const {
  return reinterpret_cast<const uint16_t *>(getTrailingObjects<char>());
}

const uint32_t *getStrDataAsUInt32() const {
  return reinterpret_cast<const uint32_t *>(getTrailingObjects<char>());
}

/// Build a string literal.
StringLiteral(const ASTContext &Ctx, StringRef Str, StringKind Kind,
              bool Pascal, QualType Ty, const SourceLocation *Loc,
              unsigned NumConcatenated);

/// Build an empty string literal.
StringLiteral(EmptyShell Empty, unsigned NumConcatenated, unsigned Length,
              unsigned CharByteWidth);

/// Map a target and string kind to the appropriate character width.
static unsigned mapCharByteWidth(TargetInfo const &Target, StringKind SK);

/// Set one of the string literal token.
void setStrTokenLoc(unsigned TokNum, SourceLocation L) {
  assert(TokNum < getNumConcatenated() && "Invalid tok number")((TokNum < getNumConcatenated() && "Invalid tok number"
) ? static_cast<void> (0) : __assert_fail ("TokNum < getNumConcatenated() && \"Invalid tok number\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1745, __PRETTY_FUNCTION__));
  getTrailingObjects<SourceLocation>()[TokNum] = L;
}

1749public:
/// This is the "fully general" constructor that allows representation of
/// strings formed from multiple concatenated tokens.
static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
                             StringKind Kind, bool Pascal, QualType Ty,
                             const SourceLocation *Loc,
                             unsigned NumConcatenated);

/// Simple constructor for string literals made from one token.
static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
                             StringKind Kind, bool Pascal, QualType Ty,
                             SourceLocation Loc) {
  return Create(Ctx, Str, Kind, Pascal, Ty, &Loc, 1);
}

/// Construct an empty string literal.
static StringLiteral *CreateEmpty(const ASTContext &Ctx,
                                  unsigned NumConcatenated, unsigned Length,
                                  unsigned CharByteWidth);

StringRef getString() const {
  assert(getCharByteWidth() == 1 &&((getCharByteWidth() == 1 && "This function is used in places that assume strings use char"
) ? static_cast<void> (0) : __assert_fail ("getCharByteWidth() == 1 && \"This function is used in places that assume strings use char\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1771, __PRETTY_FUNCTION__))
         "This function is used in places that assume strings use char")((getCharByteWidth() == 1 && "This function is used in places that assume strings use char"
) ? static_cast<void> (0) : __assert_fail ("getCharByteWidth() == 1 && \"This function is used in places that assume strings use char\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1771, __PRETTY_FUNCTION__));
  return StringRef(getStrDataAsChar(), getByteLength());
}

/// Allow access to clients that need the byte representation, such as
/// ASTWriterStmt::VisitStringLiteral().
StringRef getBytes() const {
  // FIXME: StringRef may not be the right type to use as a result for this.
  return StringRef(getStrDataAsChar(), getByteLength());
}

void outputString(raw_ostream &OS) const;

uint32_t getCodeUnit(size_t i) const {
  assert(i < getLength() && "out of bounds access")((i < getLength() && "out of bounds access") ? static_cast
<void> (0) : __assert_fail ("i < getLength() && \"out of bounds access\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1785, __PRETTY_FUNCTION__));
  switch (getCharByteWidth()) {
  case 1:
    return static_cast<unsigned char>(getStrDataAsChar()[i]);
  case 2:
    return getStrDataAsUInt16()[i];
  case 4:
    return getStrDataAsUInt32()[i];
  }
  llvm_unreachable("Unsupported character width!")::llvm::llvm_unreachable_internal("Unsupported character width!"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1794);
}

unsigned getByteLength() const { return getCharByteWidth() * getLength(); }
unsigned getLength() const { return *getTrailingObjects<unsigned>(); }
unsigned getCharByteWidth() const { return StringLiteralBits.CharByteWidth; }

StringKind getKind() const {
  return static_cast<StringKind>(StringLiteralBits.Kind);
}

bool isAscii() const { return getKind() == Ascii; }
bool isWide() const { return getKind() == Wide; }
bool isUTF8() const { return getKind() == UTF8; }
bool isUTF16() const { return getKind() == UTF16; }
bool isUTF32() const { return getKind() == UTF32; }
bool isPascal() const { return StringLiteralBits.IsPascal; }

bool containsNonAscii() const {
  for (auto c : getString())
    if (!isASCII(c))
      return true;
  return false;
}

bool containsNonAsciiOrNull() const {
  for (auto c : getString())
    if (!isASCII(c) || !c)
      return true;
  return false;
}

/// getNumConcatenated - Get the number of string literal tokens that were
/// concatenated in translation phase #6 to form this string literal.
unsigned getNumConcatenated() const {
  return StringLiteralBits.NumConcatenated;
}

/// Get one of the string literal token.
SourceLocation getStrTokenLoc(unsigned TokNum) const {
  assert(TokNum < getNumConcatenated() && "Invalid tok number")((TokNum < getNumConcatenated() && "Invalid tok number"
) ? static_cast<void> (0) : __assert_fail ("TokNum < getNumConcatenated() && \"Invalid tok number\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1834, __PRETTY_FUNCTION__));
  return getTrailingObjects<SourceLocation>()[TokNum];
}

/// getLocationOfByte - Return a source location that points to the specified
/// byte of this string literal.
///
/// Strings are amazingly complex.  They can be formed from multiple tokens
/// and can have escape sequences in them in addition to the usual trigraph
/// and escaped newline business.  This routine handles this complexity.
///
SourceLocation
getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
                  const LangOptions &Features, const TargetInfo &Target,
                  unsigned *StartToken = nullptr,
                  unsigned *StartTokenByteOffset = nullptr) const;

typedef const SourceLocation *tokloc_iterator;

tokloc_iterator tokloc_begin() const {
  return getTrailingObjects<SourceLocation>();
}

tokloc_iterator tokloc_end() const {
  return getTrailingObjects<SourceLocation>() + getNumConcatenated();
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return *tokloc_begin(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return *(tokloc_end() - 1); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == StringLiteralClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
1875};

1877/// [C99 6.4.2.2] - A predefined identifier such as __func__.
1878class PredefinedExpr final
  : public Expr,
    private llvm::TrailingObjects<PredefinedExpr, Stmt *> {
friend class ASTStmtReader;
friend TrailingObjects;

// PredefinedExpr is optionally followed by a single trailing
// "Stmt *" for the predefined identifier. It is present if and only if
// hasFunctionName() is true and is always a "StringLiteral *".

1888public:
enum IdentKind {
  Func,
  Function,
  LFunction, // Same as Function, but as wide string.
  FuncDName,
  FuncSig,
  LFuncSig, // Same as FuncSig, but as as wide string
  PrettyFunction,
  /// The same as PrettyFunction, except that the
  /// 'virtual' keyword is omitted for virtual member functions.
  PrettyFunctionNoVirtual
};

1902private:
PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
               StringLiteral *SL);

explicit PredefinedExpr(EmptyShell Empty, bool HasFunctionName);

/// True if this PredefinedExpr has storage for a function name.
bool hasFunctionName() const { return PredefinedExprBits.HasFunctionName; }

void setFunctionName(StringLiteral *SL) {
  assert(hasFunctionName() &&((hasFunctionName() && "This PredefinedExpr has no storage for a function name!"
) ? static_cast<void> (0) : __assert_fail ("hasFunctionName() && \"This PredefinedExpr has no storage for a function name!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1913, __PRETTY_FUNCTION__))
         "This PredefinedExpr has no storage for a function name!")((hasFunctionName() && "This PredefinedExpr has no storage for a function name!"
) ? static_cast<void> (0) : __assert_fail ("hasFunctionName() && \"This PredefinedExpr has no storage for a function name!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 1913, __PRETTY_FUNCTION__));
  *getTrailingObjects<Stmt *>() = SL;
}

1917public:
/// Create a PredefinedExpr.
static PredefinedExpr *Create(const ASTContext &Ctx, SourceLocation L,
                              QualType FNTy, IdentKind IK, StringLiteral *SL);

/// Create an empty PredefinedExpr.
static PredefinedExpr *CreateEmpty(const ASTContext &Ctx,
                                   bool HasFunctionName);

IdentKind getIdentKind() const {
  return static_cast<IdentKind>(PredefinedExprBits.Kind);
}

SourceLocation getLocation() const { return PredefinedExprBits.Loc; }
void setLocation(SourceLocation L) { PredefinedExprBits.Loc = L; }

StringLiteral *getFunctionName() {
  return hasFunctionName()
             ? static_cast<StringLiteral *>(*getTrailingObjects<Stmt *>())
             : nullptr;
}

const StringLiteral *getFunctionName() const {
  return hasFunctionName()
             ? static_cast<StringLiteral *>(*getTrailingObjects<Stmt *>())
             : nullptr;
}

static StringRef getIdentKindName(IdentKind IK);
static std::string ComputeName(IdentKind IK, const Decl *CurrentDecl);

SourceLocation getBeginLoc() const { return getLocation(); }
SourceLocation getEndLoc() const { return getLocation(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == PredefinedExprClass;
}

// Iterators
child_range children() {
  return child_range(getTrailingObjects<Stmt *>(),
                     getTrailingObjects<Stmt *>() + hasFunctionName());
}

const_child_range children() const {
  return const_child_range(getTrailingObjects<Stmt *>(),
                           getTrailingObjects<Stmt *>() + hasFunctionName());
}
1965};

1967/// ParenExpr - This represents a parethesized expression, e.g. "(1)".  This
1968/// AST node is only formed if full location information is requested.
1969class ParenExpr : public Expr {
SourceLocation L, R;
Stmt *Val;
1972public:
ParenExpr(SourceLocation l, SourceLocation r, Expr *val)
  : Expr(ParenExprClass, val->getType(),
         val->getValueKind(), val->getObjectKind(),
         val->isTypeDependent(), val->isValueDependent(),
         val->isInstantiationDependent(),
         val->containsUnexpandedParameterPack()),
    L(l), R(r), Val(val) {}

/// Construct an empty parenthesized expression.
explicit ParenExpr(EmptyShell Empty)
  : Expr(ParenExprClass, Empty) { }

const Expr *getSubExpr() const { return cast<Expr>(Val); }
Expr *getSubExpr() { return cast<Expr>(Val); }
void setSubExpr(Expr *E) { Val = E; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return L; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return R; }

/// Get the location of the left parentheses '('.
SourceLocation getLParen() const { return L; }
void setLParen(SourceLocation Loc) { L = Loc; }

/// Get the location of the right parentheses ')'.
SourceLocation getRParen() const { return R; }
void setRParen(SourceLocation Loc) { R = Loc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ParenExprClass;
}

// Iterators
child_range children() { return child_range(&Val, &Val+1); }
const_child_range children() const {
  return const_child_range(&Val, &Val + 1);
}
2009};

2011/// UnaryOperator - This represents the unary-expression's (except sizeof and
2012/// alignof), the postinc/postdec operators from postfix-expression, and various
2013/// extensions.
2014///
2015/// Notes on various nodes:
2016///
2017/// Real/Imag - These return the real/imag part of a complex operand.  If
2018///   applied to a non-complex value, the former returns its operand and the
2019///   later returns zero in the type of the operand.
2020///
2021class UnaryOperator : public Expr {
Stmt *Val;

2024public:
typedef UnaryOperatorKind Opcode;

UnaryOperator(Expr *input, Opcode opc, QualType type, ExprValueKind VK,
              ExprObjectKind OK, SourceLocation l, bool CanOverflow)
    : Expr(UnaryOperatorClass, type, VK, OK,
           input->isTypeDependent() || type->isDependentType(),
           input->isValueDependent(),
           (input->isInstantiationDependent() ||
            type->isInstantiationDependentType()),
           input->containsUnexpandedParameterPack()),
      Val(input) {
  UnaryOperatorBits.Opc = opc;
  UnaryOperatorBits.CanOverflow = CanOverflow;
  UnaryOperatorBits.Loc = l;
}

/// Build an empty unary operator.
explicit UnaryOperator(EmptyShell Empty) : Expr(UnaryOperatorClass, Empty) {
  UnaryOperatorBits.Opc = UO_AddrOf;
}

Opcode getOpcode() const {
  return static_cast<Opcode>(UnaryOperatorBits.Opc);
}
void setOpcode(Opcode Opc) { UnaryOperatorBits.Opc = Opc; }

Expr *getSubExpr() const { return cast<Expr>(Val); }
void setSubExpr(Expr *E) { Val = E; }

/// getOperatorLoc - Return the location of the operator.
SourceLocation getOperatorLoc() const { return UnaryOperatorBits.Loc; }
void setOperatorLoc(SourceLocation L) { UnaryOperatorBits.Loc = L; }

/// Returns true if the unary operator can cause an overflow. For instance,
///   signed int i = INT_MAX; i++;
///   signed char c = CHAR_MAX; c++;
/// Due to integer promotions, c++ is promoted to an int before the postfix
/// increment, and the result is an int that cannot overflow. However, i++
/// can overflow.
bool canOverflow() const { return UnaryOperatorBits.CanOverflow; }
void setCanOverflow(bool C) { UnaryOperatorBits.CanOverflow = C; }

/// isPostfix - Return true if this is a postfix operation, like x++.
static bool isPostfix(Opcode Op) {
  return Op == UO_PostInc || Op == UO_PostDec;
}

/// isPrefix - Return true if this is a prefix operation, like --x.
static bool isPrefix(Opcode Op) {
  return Op == UO_PreInc || Op == UO_PreDec;
}

bool isPrefix() const { return isPrefix(getOpcode()); }
bool isPostfix() const { return isPostfix(getOpcode()); }

static bool isIncrementOp(Opcode Op) {
  return Op == UO_PreInc || Op == UO_PostInc;
}
bool isIncrementOp() const {
  return isIncrementOp(getOpcode());
}

static bool isDecrementOp(Opcode Op) {
  return Op == UO_PreDec || Op == UO_PostDec;
}
bool isDecrementOp() const {
  return isDecrementOp(getOpcode());
}

static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; }
bool isIncrementDecrementOp() const {
  return isIncrementDecrementOp(getOpcode());
}

static bool isArithmeticOp(Opcode Op) {
  return Op >= UO_Plus && Op <= UO_LNot;
}
bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); }

/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "sizeof" or "[pre]++"
static StringRef getOpcodeStr(Opcode Op);

/// Retrieve the unary opcode that corresponds to the given
/// overloaded operator.
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix);

/// Retrieve the overloaded operator kind that corresponds to
/// the given unary opcode.
static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return isPostfix() ? Val->getBeginLoc() : getOperatorLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return isPostfix() ? getOperatorLoc() : Val->getEndLoc();
}
SourceLocation getExprLoc() const { return getOperatorLoc(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == UnaryOperatorClass;
}

// Iterators
child_range children() { return child_range(&Val, &Val+1); }
const_child_range children() const {
  return const_child_range(&Val, &Val + 1);
}
2133};

2135/// Helper class for OffsetOfExpr.

2137// __builtin_offsetof(type, identifier(.identifier|[expr])*)
2138class OffsetOfNode {
2139public:
/// The kind of offsetof node we have.
enum Kind {
  /// An index into an array.
  Array = 0x00,
  /// A field.
  Field = 0x01,
  /// A field in a dependent type, known only by its name.
  Identifier = 0x02,
  /// An implicit indirection through a C++ base class, when the
  /// field found is in a base class.
  Base = 0x03
};

2153private:
enum { MaskBits = 2, Mask = 0x03 };

/// The source range that covers this part of the designator.
SourceRange Range;

/// The data describing the designator, which comes in three
/// different forms, depending on the lower two bits.
///   - An unsigned index into the array of Expr*'s stored after this node
///     in memory, for [constant-expression] designators.
///   - A FieldDecl*, for references to a known field.
///   - An IdentifierInfo*, for references to a field with a given name
///     when the class type is dependent.
///   - A CXXBaseSpecifier*, for references that look at a field in a
///     base class.
uintptr_t Data;

2170public:
/// Create an offsetof node that refers to an array element.
OffsetOfNode(SourceLocation LBracketLoc, unsigned Index,
             SourceLocation RBracketLoc)
    : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) {}

/// Create an offsetof node that refers to a field.
OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, SourceLocation NameLoc)
    : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
      Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) {}

/// Create an offsetof node that refers to an identifier.
OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name,
             SourceLocation NameLoc)
    : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
      Data(reinterpret_cast<uintptr_t>(Name) | Identifier) {}

/// Create an offsetof node that refers into a C++ base class.
explicit OffsetOfNode(const CXXBaseSpecifier *Base)
    : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {}

/// Determine what kind of offsetof node this is.
Kind getKind() const { return static_cast<Kind>(Data & Mask); }

/// For an array element node, returns the index into the array
/// of expressions.
unsigned getArrayExprIndex() const {
  assert(getKind() == Array)((getKind() == Array) ? static_cast<void> (0) : __assert_fail
 ("getKind() == Array", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2197, __PRETTY_FUNCTION__));
  return Data >> 2;
}

/// For a field offsetof node, returns the field.
FieldDecl *getField() const {
  assert(getKind() == Field)((getKind() == Field) ? static_cast<void> (0) : __assert_fail
 ("getKind() == Field", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2203, __PRETTY_FUNCTION__));
  return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask);
}

/// For a field or identifier offsetof node, returns the name of
/// the field.
IdentifierInfo *getFieldName() const;

/// For a base class node, returns the base specifier.
CXXBaseSpecifier *getBase() const {
  assert(getKind() == Base)((getKind() == Base) ? static_cast<void> (0) : __assert_fail
 ("getKind() == Base", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2213, __PRETTY_FUNCTION__));
  return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask);
}

/// Retrieve the source range that covers this offsetof node.
///
/// For an array element node, the source range contains the locations of
/// the square brackets. For a field or identifier node, the source range
/// contains the location of the period (if there is one) and the
/// identifier.
SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) { return Range; }
SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getBegin(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return Range.getEnd(); }
2226};

2228/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form
2229/// offsetof(record-type, member-designator). For example, given:
2230/// @code
2231/// struct S {
2232///   float f;
2233///   double d;
2234/// };
2235/// struct T {
2236///   int i;
2237///   struct S s[10];
2238/// };
2239/// @endcode
2240/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d).

2242class OffsetOfExpr final
  : public Expr,
    private llvm::TrailingObjects<OffsetOfExpr, OffsetOfNode, Expr *> {
SourceLocation OperatorLoc, RParenLoc;
// Base type;
TypeSourceInfo *TSInfo;
// Number of sub-components (i.e. instances of OffsetOfNode).
unsigned NumComps;
// Number of sub-expressions (i.e. array subscript expressions).
unsigned NumExprs;

size_t numTrailingObjects(OverloadToken<OffsetOfNode>) const {
  return NumComps;
}

OffsetOfExpr(const ASTContext &C, QualType type,
             SourceLocation OperatorLoc, TypeSourceInfo *tsi,
             ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs,
             SourceLocation RParenLoc);

explicit OffsetOfExpr(unsigned numComps, unsigned numExprs)
  : Expr(OffsetOfExprClass, EmptyShell()),
    TSInfo(nullptr), NumComps(numComps), NumExprs(numExprs) {}

2266public:

static OffsetOfExpr *Create(const ASTContext &C, QualType type,
                            SourceLocation OperatorLoc, TypeSourceInfo *tsi,
                            ArrayRef<OffsetOfNode> comps,
                            ArrayRef<Expr*> exprs, SourceLocation RParenLoc);

static OffsetOfExpr *CreateEmpty(const ASTContext &C,
                                 unsigned NumComps, unsigned NumExprs);

/// getOperatorLoc - Return the location of the operator.
SourceLocation getOperatorLoc() const { return OperatorLoc; }
void setOperatorLoc(SourceLocation L) { OperatorLoc = L; }

/// Return the location of the right parentheses.
SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation R) { RParenLoc = R; }

TypeSourceInfo *getTypeSourceInfo() const {
  return TSInfo;
}
void setTypeSourceInfo(TypeSourceInfo *tsi) {
  TSInfo = tsi;
}

const OffsetOfNode &getComponent(unsigned Idx) const {
  assert(Idx < NumComps && "Subscript out of range")((Idx < NumComps && "Subscript out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < NumComps && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2292, __PRETTY_FUNCTION__));
  return getTrailingObjects<OffsetOfNode>()[Idx];
}

void setComponent(unsigned Idx, OffsetOfNode ON) {
  assert(Idx < NumComps && "Subscript out of range")((Idx < NumComps && "Subscript out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < NumComps && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2297, __PRETTY_FUNCTION__));
  getTrailingObjects<OffsetOfNode>()[Idx] = ON;
}

unsigned getNumComponents() const {
  return NumComps;
}

Expr* getIndexExpr(unsigned Idx) {
  assert(Idx < NumExprs && "Subscript out of range")((Idx < NumExprs && "Subscript out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < NumExprs && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2306, __PRETTY_FUNCTION__));
  return getTrailingObjects<Expr *>()[Idx];
}

const Expr *getIndexExpr(unsigned Idx) const {
  assert(Idx < NumExprs && "Subscript out of range")((Idx < NumExprs && "Subscript out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < NumExprs && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2311, __PRETTY_FUNCTION__));
  return getTrailingObjects<Expr *>()[Idx];
}

void setIndexExpr(unsigned Idx, Expr* E) {
  assert(Idx < NumComps && "Subscript out of range")((Idx < NumComps && "Subscript out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < NumComps && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2316, __PRETTY_FUNCTION__));
  getTrailingObjects<Expr *>()[Idx] = E;
}

unsigned getNumExpressions() const {
  return NumExprs;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return OperatorLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == OffsetOfExprClass;
}

// Iterators
child_range children() {
  Stmt **begin = reinterpret_cast<Stmt **>(getTrailingObjects<Expr *>());
  return child_range(begin, begin + NumExprs);
}
const_child_range children() const {
  Stmt *const *begin =
      reinterpret_cast<Stmt *const *>(getTrailingObjects<Expr *>());
  return const_child_range(begin, begin + NumExprs);
}
friend TrailingObjects;
2342};

2344/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated)
2345/// expression operand.  Used for sizeof/alignof (C99 6.5.3.4) and
2346/// vec_step (OpenCL 1.1 6.11.12).
2347class UnaryExprOrTypeTraitExpr : public Expr {
union {
  TypeSourceInfo *Ty;
  Stmt *Ex;
} Argument;
SourceLocation OpLoc, RParenLoc;

2354public:
UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo,
                         QualType resultType, SourceLocation op,
                         SourceLocation rp) :
    Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
         false, // Never type-dependent (C++ [temp.dep.expr]p3).
         // Value-dependent if the argument is type-dependent.
         TInfo->getType()->isDependentType(),
         TInfo->getType()->isInstantiationDependentType(),
         TInfo->getType()->containsUnexpandedParameterPack()),
    OpLoc(op), RParenLoc(rp) {
  UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
  UnaryExprOrTypeTraitExprBits.IsType = true;
  Argument.Ty = TInfo;
}

UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E,
                         QualType resultType, SourceLocation op,
                         SourceLocation rp);

/// Construct an empty sizeof/alignof expression.
explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty)
  : Expr(UnaryExprOrTypeTraitExprClass, Empty) { }

UnaryExprOrTypeTrait getKind() const {
  return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind);
}
void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;}

bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; }
QualType getArgumentType() const {
  return getArgumentTypeInfo()->getType();
}
TypeSourceInfo *getArgumentTypeInfo() const {
  assert(isArgumentType() && "calling getArgumentType() when arg is expr")((isArgumentType() && "calling getArgumentType() when arg is expr"
) ? static_cast<void> (0) : __assert_fail ("isArgumentType() && \"calling getArgumentType() when arg is expr\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2388, __PRETTY_FUNCTION__));
  return Argument.Ty;
}
Expr *getArgumentExpr() {
  assert(!isArgumentType() && "calling getArgumentExpr() when arg is type")((!isArgumentType() && "calling getArgumentExpr() when arg is type"
) ? static_cast<void> (0) : __assert_fail ("!isArgumentType() && \"calling getArgumentExpr() when arg is type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2392, __PRETTY_FUNCTION__));
  return static_cast<Expr*>(Argument.Ex);
}
const Expr *getArgumentExpr() const {
  return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr();
}

void setArgument(Expr *E) {
  Argument.Ex = E;
  UnaryExprOrTypeTraitExprBits.IsType = false;
}
void setArgument(TypeSourceInfo *TInfo) {
  Argument.Ty = TInfo;
  UnaryExprOrTypeTraitExprBits.IsType = true;
}

/// Gets the argument type, or the type of the argument expression, whichever
/// is appropriate.
QualType getTypeOfArgument() const {
  return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType();
}

SourceLocation getOperatorLoc() const { return OpLoc; }
void setOperatorLoc(SourceLocation L) { OpLoc = L; }

SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return OpLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == UnaryExprOrTypeTraitExprClass;
}

// Iterators
child_range children();
const_child_range children() const;
2430};

2432//===----------------------------------------------------------------------===//
2433// Postfix Operators.
2434//===----------------------------------------------------------------------===//

2436/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
2437class ArraySubscriptExpr : public Expr {
enum { LHS, RHS, END_EXPR };
Stmt *SubExprs[END_EXPR];

bool lhsIsBase() const { return getRHS()->getType()->isIntegerType(); }

2443public:
ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t,
                   ExprValueKind VK, ExprObjectKind OK,
                   SourceLocation rbracketloc)
: Expr(ArraySubscriptExprClass, t, VK, OK,
       lhs->isTypeDependent() || rhs->isTypeDependent(),
       lhs->isValueDependent() || rhs->isValueDependent(),
       (lhs->isInstantiationDependent() ||
        rhs->isInstantiationDependent()),
       (lhs->containsUnexpandedParameterPack() ||
        rhs->containsUnexpandedParameterPack())) {
  SubExprs[LHS] = lhs;
  SubExprs[RHS] = rhs;
  ArraySubscriptExprBits.RBracketLoc = rbracketloc;
}

/// Create an empty array subscript expression.
explicit ArraySubscriptExpr(EmptyShell Shell)
  : Expr(ArraySubscriptExprClass, Shell) { }

/// An array access can be written A[4] or 4[A] (both are equivalent).
/// - getBase() and getIdx() always present the normalized view: A[4].
///    In this case getBase() returns "A" and getIdx() returns "4".
/// - getLHS() and getRHS() present the syntactic view. e.g. for
///    4[A] getLHS() returns "4".
/// Note: Because vector element access is also written A[4] we must
/// predicate the format conversion in getBase and getIdx only on the
/// the type of the RHS, as it is possible for the LHS to be a vector of
/// integer type
Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); }
const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
void setLHS(Expr *E) { SubExprs[LHS] = E; }

Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); }
const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
void setRHS(Expr *E) { SubExprs[RHS] = E; }

Expr *getBase() { return lhsIsBase() ? getLHS() : getRHS(); }
const Expr *getBase() const { return lhsIsBase() ? getLHS() : getRHS(); }

Expr *getIdx() { return lhsIsBase() ? getRHS() : getLHS(); }
const Expr *getIdx() const { return lhsIsBase() ? getRHS() : getLHS(); }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getLHS()->getBeginLoc();
}
SourceLocation getEndLoc() const { return getRBracketLoc(); }

SourceLocation getRBracketLoc() const {
  return ArraySubscriptExprBits.RBracketLoc;
}
void setRBracketLoc(SourceLocation L) {
  ArraySubscriptExprBits.RBracketLoc = L;
}

SourceLocation getExprLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getBase()->getExprLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ArraySubscriptExprClass;
}

// Iterators
child_range children() {
  return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
}
const_child_range children() const {
  return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
}
2513};

2515/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
2516/// CallExpr itself represents a normal function call, e.g., "f(x, 2)",
2517/// while its subclasses may represent alternative syntax that (semantically)
2518/// results in a function call. For example, CXXOperatorCallExpr is
2519/// a subclass for overloaded operator calls that use operator syntax, e.g.,
2520/// "str1 + str2" to resolve to a function call.
2521class CallExpr : public Expr {
enum { FN = 0, PREARGS_START = 1 };

/// The number of arguments in the call expression.
unsigned NumArgs;

/// The location of the right parenthese. This has a different meaning for
/// the derived classes of CallExpr.
SourceLocation RParenLoc;

void updateDependenciesFromArg(Expr *Arg);

// CallExpr store some data in trailing objects. However since CallExpr
// is used a base of other expression classes we cannot use
// llvm::TrailingObjects. Instead we manually perform the pointer arithmetic
// and casts.
//
// The trailing objects are in order:
//
// * A single "Stmt *" for the callee expression.
//
// * An array of getNumPreArgs() "Stmt *" for the pre-argument expressions.
//
// * An array of getNumArgs() "Stmt *" for the argument expressions.
//
// Note that we store the offset in bytes from the this pointer to the start
// of the trailing objects. It would be perfectly possible to compute it
// based on the dynamic kind of the CallExpr. However 1.) we have plenty of
// space in the bit-fields of Stmt. 2.) It was benchmarked to be faster to
// compute this once and then load the offset from the bit-fields of Stmt,
// instead of re-computing the offset each time the trailing objects are
// accessed.

/// Return a pointer to the start of the trailing array of "Stmt *".
Stmt **getTrailingStmts() {
  return reinterpret_cast<Stmt **>(reinterpret_cast<char *>(this) +
                                   CallExprBits.OffsetToTrailingObjects);
}
Stmt *const *getTrailingStmts() const {
  return const_cast<CallExpr *>(this)->getTrailingStmts();
}

/// Map a statement class to the appropriate offset in bytes from the
/// this pointer to the trailing objects.
static unsigned offsetToTrailingObjects(StmtClass SC);

2567public:
enum class ADLCallKind : bool { NotADL, UsesADL };
static constexpr ADLCallKind NotADL = ADLCallKind::NotADL;
static constexpr ADLCallKind UsesADL = ADLCallKind::UsesADL;

2572protected:
/// Build a call expression, assuming that appropriate storage has been
/// allocated for the trailing objects.
CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
         ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
         SourceLocation RParenLoc, unsigned MinNumArgs, ADLCallKind UsesADL);

/// Build an empty call expression, for deserialization.
CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
         EmptyShell Empty);

/// Return the size in bytes needed for the trailing objects.
/// Used by the derived classes to allocate the right amount of storage.
static unsigned sizeOfTrailingObjects(unsigned NumPreArgs, unsigned NumArgs) {
  return (1 + NumPreArgs + NumArgs) * sizeof(Stmt *);
}

Stmt *getPreArg(unsigned I) {
  assert(I < getNumPreArgs() && "Prearg access out of range!")((I < getNumPreArgs() && "Prearg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumPreArgs() && \"Prearg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2590, __PRETTY_FUNCTION__));
  return getTrailingStmts()[PREARGS_START + I];
}
const Stmt *getPreArg(unsigned I) const {
  assert(I < getNumPreArgs() && "Prearg access out of range!")((I < getNumPreArgs() && "Prearg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumPreArgs() && \"Prearg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2594, __PRETTY_FUNCTION__));
  return getTrailingStmts()[PREARGS_START + I];
}
void setPreArg(unsigned I, Stmt *PreArg) {
  assert(I < getNumPreArgs() && "Prearg access out of range!")((I < getNumPreArgs() && "Prearg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumPreArgs() && \"Prearg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2598, __PRETTY_FUNCTION__));
  getTrailingStmts()[PREARGS_START + I] = PreArg;
}

unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; }

2604public:
/// Create a call expression. Fn is the callee expression, Args is the
/// argument array, Ty is the type of the call expression (which is *not*
/// the return type in general), VK is the value kind of the call expression
/// (lvalue, rvalue, ...), and RParenLoc is the location of the right
/// parenthese in the call expression. MinNumArgs specifies the minimum
/// number of arguments. The actual number of arguments will be the greater
/// of Args.size() and MinNumArgs. This is used in a few places to allocate
/// enough storage for the default arguments. UsesADL specifies whether the
/// callee was found through argument-dependent lookup.
///
/// Note that you can use CreateTemporary if you need a temporary call
/// expression on the stack.
static CallExpr *Create(const ASTContext &Ctx, Expr *Fn,
                        ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
                        SourceLocation RParenLoc, unsigned MinNumArgs = 0,
                        ADLCallKind UsesADL = NotADL);

/// Create a temporary call expression with no arguments in the memory
/// pointed to by Mem. Mem must points to at least sizeof(CallExpr)
/// + sizeof(Stmt *) bytes of storage, aligned to alignof(CallExpr):
///
/// \code{.cpp}
///   alignas(CallExpr) char Buffer[sizeof(CallExpr) + sizeof(Stmt *)];
///   CallExpr *TheCall = CallExpr::CreateTemporary(Buffer, etc);
/// \endcode
static CallExpr *CreateTemporary(void *Mem, Expr *Fn, QualType Ty,
                                 ExprValueKind VK, SourceLocation RParenLoc,
                                 ADLCallKind UsesADL = NotADL);

/// Create an empty call expression, for deserialization.
static CallExpr *CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
                             EmptyShell Empty);

Expr *getCallee() { return cast<Expr>(getTrailingStmts()[FN]); }
const Expr *getCallee() const { return cast<Expr>(getTrailingStmts()[FN]); }
void setCallee(Expr *F) { getTrailingStmts()[FN] = F; }

ADLCallKind getADLCallKind() const {
  return static_cast<ADLCallKind>(CallExprBits.UsesADL);
}
void setADLCallKind(ADLCallKind V = UsesADL) {
  CallExprBits.UsesADL = static_cast<bool>(V);
}
bool usesADL() const { return getADLCallKind() == UsesADL; }

Decl *getCalleeDecl() { return getCallee()->getReferencedDeclOfCallee(); }
const Decl *getCalleeDecl() const {
  return getCallee()->getReferencedDeclOfCallee();
}

/// If the callee is a FunctionDecl, return it. Otherwise return null.
FunctionDecl *getDirectCallee() {
  return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
}
const FunctionDecl *getDirectCallee() const {
  return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
}

/// getNumArgs - Return the number of actual arguments to this call.
unsigned getNumArgs() const { return NumArgs; }

/// Retrieve the call arguments.
Expr **getArgs() {
  return reinterpret_cast<Expr **>(getTrailingStmts() + PREARGS_START +
                                   getNumPreArgs());
}
const Expr *const *getArgs() const {
  return reinterpret_cast<const Expr *const *>(
      getTrailingStmts() + PREARGS_START + getNumPreArgs());
}

/// getArg - Return the specified argument.
Expr *getArg(unsigned Arg) {
  assert(Arg < getNumArgs() && "Arg access out of range!")((Arg < getNumArgs() && "Arg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Arg < getNumArgs() && \"Arg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2678, __PRETTY_FUNCTION__));
  return getArgs()[Arg];
}
const Expr *getArg(unsigned Arg) const {
  assert(Arg < getNumArgs() && "Arg access out of range!")((Arg < getNumArgs() && "Arg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Arg < getNumArgs() && \"Arg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2682, __PRETTY_FUNCTION__));
  return getArgs()[Arg];
}

/// setArg - Set the specified argument.
void setArg(unsigned Arg, Expr *ArgExpr) {
  assert(Arg < getNumArgs() && "Arg access out of range!")((Arg < getNumArgs() && "Arg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Arg < getNumArgs() && \"Arg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2688, __PRETTY_FUNCTION__));
  getArgs()[Arg] = ArgExpr;
}

/// Reduce the number of arguments in this call expression. This is used for
/// example during error recovery to drop extra arguments. There is no way
/// to perform the opposite because: 1.) We don't track how much storage
/// we have for the argument array 2.) This would potentially require growing
/// the argument array, something we cannot support since the arguments are
/// stored in a trailing array.
void shrinkNumArgs(unsigned NewNumArgs) {
  assert((NewNumArgs <= getNumArgs()) &&(((NewNumArgs <= getNumArgs()) && "shrinkNumArgs cannot increase the number of arguments!"
) ? static_cast<void> (0) : __assert_fail ("(NewNumArgs <= getNumArgs()) && \"shrinkNumArgs cannot increase the number of arguments!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2700, __PRETTY_FUNCTION__))
         "shrinkNumArgs cannot increase the number of arguments!")(((NewNumArgs <= getNumArgs()) && "shrinkNumArgs cannot increase the number of arguments!"
) ? static_cast<void> (0) : __assert_fail ("(NewNumArgs <= getNumArgs()) && \"shrinkNumArgs cannot increase the number of arguments!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 2700, __PRETTY_FUNCTION__));
  NumArgs = NewNumArgs;
}

/// Bluntly set a new number of arguments without doing any checks whatsoever.
/// Only used during construction of a CallExpr in a few places in Sema.
/// FIXME: Find a way to remove it.
void setNumArgsUnsafe(unsigned NewNumArgs) { NumArgs = NewNumArgs; }

typedef ExprIterator arg_iterator;
typedef ConstExprIterator const_arg_iterator;
typedef llvm::iterator_range<arg_iterator> arg_range;
typedef llvm::iterator_range<const_arg_iterator> const_arg_range;

arg_range arguments() { return arg_range(arg_begin(), arg_end()); }
const_arg_range arguments() const {
  return const_arg_range(arg_begin(), arg_end());
}

arg_iterator arg_begin() {
  return getTrailingStmts() + PREARGS_START + getNumPreArgs();
}
arg_iterator arg_end() { return arg_begin() + getNumArgs(); }

const_arg_iterator arg_begin() const {
  return getTrailingStmts() + PREARGS_START + getNumPreArgs();
}
const_arg_iterator arg_end() const { return arg_begin() + getNumArgs(); }

/// This method provides fast access to all the subexpressions of
/// a CallExpr without going through the slower virtual child_iterator
/// interface.  This provides efficient reverse iteration of the
/// subexpressions.  This is currently used for CFG construction.
ArrayRef<Stmt *> getRawSubExprs() {
  return llvm::makeArrayRef(getTrailingStmts(),
                            PREARGS_START + getNumPreArgs() + getNumArgs());
}

/// getNumCommas - Return the number of commas that must have been present in
/// this function call.
unsigned getNumCommas() const { return getNumArgs() ? getNumArgs() - 1 : 0; }

/// getBuiltinCallee - If this is a call to a builtin, return the builtin ID
/// of the callee. If not, return 0.
unsigned getBuiltinCallee() const;

/// Returns \c true if this is a call to a builtin which does not
/// evaluate side-effects within its arguments.
bool isUnevaluatedBuiltinCall(const ASTContext &Ctx) const;

/// getCallReturnType - Get the return type of the call expr. This is not
/// always the type of the expr itself, if the return type is a reference
/// type.
QualType getCallReturnType(const ASTContext &Ctx) const;

/// Returns the WarnUnusedResultAttr that is either declared on the called
/// function, or its return type declaration.
const Attr *getUnusedResultAttr(const ASTContext &Ctx) const;

/// Returns true if this call expression should warn on unused results.
bool hasUnusedResultAttr(const ASTContext &Ctx) const {
  return getUnusedResultAttr(Ctx) != nullptr;
}

SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

/// Return true if this is a call to __assume() or __builtin_assume() with
/// a non-value-dependent constant parameter evaluating as false.
bool isBuiltinAssumeFalse(const ASTContext &Ctx) const;

bool isCallToStdMove() const {
  const FunctionDecl *FD = getDirectCallee();
  return getNumArgs() == 1 && FD && FD->isInStdNamespace() &&
         FD->getIdentifier() && FD->getIdentifier()->isStr("move");
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() >= firstCallExprConstant &&
         T->getStmtClass() <= lastCallExprConstant;
}

// Iterators
child_range children() {
  return child_range(getTrailingStmts(), getTrailingStmts() + PREARGS_START +
                                             getNumPreArgs() + getNumArgs());
}

const_child_range children() const {
  return const_child_range(getTrailingStmts(),
                           getTrailingStmts() + PREARGS_START +
                               getNumPreArgs() + getNumArgs());
}
2796};

2798/// Extra data stored in some MemberExpr objects.
2799struct MemberExprNameQualifier {
/// The nested-name-specifier that qualifies the name, including
/// source-location information.
NestedNameSpecifierLoc QualifierLoc;

/// The DeclAccessPair through which the MemberDecl was found due to
/// name qualifiers.
DeclAccessPair FoundDecl;
2807};

2809/// MemberExpr - [C99 6.5.2.3] Structure and Union Members.  X->F and X.F.
2810///
2811class MemberExpr final
  : public Expr,
    private llvm::TrailingObjects<MemberExpr, MemberExprNameQualifier,
                                  ASTTemplateKWAndArgsInfo,
                                  TemplateArgumentLoc> {
friend class ASTReader;
friend class ASTStmtReader;
friend class ASTStmtWriter;
friend TrailingObjects;

/// Base - the expression for the base pointer or structure references.  In
/// X.F, this is "X".
Stmt *Base;

/// MemberDecl - This is the decl being referenced by the field/member name.
/// In X.F, this is the decl referenced by F.
ValueDecl *MemberDecl;

/// MemberDNLoc - Provides source/type location info for the
/// declaration name embedded in MemberDecl.
DeclarationNameLoc MemberDNLoc;

/// MemberLoc - This is the location of the member name.
SourceLocation MemberLoc;

size_t numTrailingObjects(OverloadToken<MemberExprNameQualifier>) const {
  return hasQualifierOrFoundDecl();
}

size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
  return hasTemplateKWAndArgsInfo();
}

bool hasQualifierOrFoundDecl() const {
  return MemberExprBits.HasQualifierOrFoundDecl;
}

bool hasTemplateKWAndArgsInfo() const {
  return MemberExprBits.HasTemplateKWAndArgsInfo;
}

MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
           ValueDecl *MemberDecl, const DeclarationNameInfo &NameInfo,
           QualType T, ExprValueKind VK, ExprObjectKind OK,
           NonOdrUseReason NOUR);
MemberExpr(EmptyShell Empty)
    : Expr(MemberExprClass, Empty), Base(), MemberDecl() {}

2859public:
static MemberExpr *Create(const ASTContext &C, Expr *Base, bool IsArrow,
                          SourceLocation OperatorLoc,
                          NestedNameSpecifierLoc QualifierLoc,
                          SourceLocation TemplateKWLoc, ValueDecl *MemberDecl,
                          DeclAccessPair FoundDecl,
                          DeclarationNameInfo MemberNameInfo,
                          const TemplateArgumentListInfo *TemplateArgs,
                          QualType T, ExprValueKind VK, ExprObjectKind OK,
                          NonOdrUseReason NOUR);

/// Create an implicit MemberExpr, with no location, qualifier, template
/// arguments, and so on. Suitable only for non-static member access.
static MemberExpr *CreateImplicit(const ASTContext &C, Expr *Base,
                                  bool IsArrow, ValueDecl *MemberDecl,
                                  QualType T, ExprValueKind VK,
                                  ExprObjectKind OK) {
  return Create(C, Base, IsArrow, SourceLocation(), NestedNameSpecifierLoc(),
                SourceLocation(), MemberDecl,
                DeclAccessPair::make(MemberDecl, MemberDecl->getAccess()),
                DeclarationNameInfo(), nullptr, T, VK, OK, NOUR_None);
}

static MemberExpr *CreateEmpty(const ASTContext &Context, bool HasQualifier,
                               bool HasFoundDecl,
                               bool HasTemplateKWAndArgsInfo,
                               unsigned NumTemplateArgs);

void setBase(Expr *E) { Base = E; }
Expr *getBase() const { return cast<Expr>(Base); }

/// Retrieve the member declaration to which this expression refers.
///
/// The returned declaration will be a FieldDecl or (in C++) a VarDecl (for
/// static data members), a CXXMethodDecl, or an EnumConstantDecl.
ValueDecl *getMemberDecl() const { return MemberDecl; }
void setMemberDecl(ValueDecl *D) { MemberDecl = D; }

/// Retrieves the declaration found by lookup.
DeclAccessPair getFoundDecl() const {
  if (!hasQualifierOrFoundDecl())
    return DeclAccessPair::make(getMemberDecl(),
                                getMemberDecl()->getAccess());
  return getTrailingObjects<MemberExprNameQualifier>()->FoundDecl;
}

/// Determines whether this member expression actually had
/// a C++ nested-name-specifier prior to the name of the member, e.g.,
/// x->Base::foo.
bool hasQualifier() const { return getQualifier() != nullptr; }

/// If the member name was qualified, retrieves the
/// nested-name-specifier that precedes the member name, with source-location
/// information.
NestedNameSpecifierLoc getQualifierLoc() const {
  if (!hasQualifierOrFoundDecl())
    return NestedNameSpecifierLoc();
  return getTrailingObjects<MemberExprNameQualifier>()->QualifierLoc;
}

/// If the member name was qualified, retrieves the
/// nested-name-specifier that precedes the member name. Otherwise, returns
/// NULL.
NestedNameSpecifier *getQualifier() const {
  return getQualifierLoc().getNestedNameSpecifier();
}

/// Retrieve the location of the template keyword preceding
/// the member name, if any.
SourceLocation getTemplateKeywordLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
}

/// Retrieve the location of the left angle bracket starting the
/// explicit template argument list following the member name, if any.
SourceLocation getLAngleLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
}

/// Retrieve the location of the right angle bracket ending the
/// explicit template argument list following the member name, if any.
SourceLocation getRAngleLoc() const {
  if (!hasTemplateKWAndArgsInfo())
    return SourceLocation();
  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
}

/// Determines whether the member name was preceded by the template keyword.
bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }

/// Determines whether the member name was followed by an
/// explicit template argument list.
bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }

/// Copies the template arguments (if present) into the given
/// structure.
void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
  if (hasExplicitTemplateArgs())
    getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
        getTrailingObjects<TemplateArgumentLoc>(), List);
}

/// Retrieve the template arguments provided as part of this
/// template-id.
const TemplateArgumentLoc *getTemplateArgs() const {
  if (!hasExplicitTemplateArgs())
    return nullptr;

  return getTrailingObjects<TemplateArgumentLoc>();
}

/// Retrieve the number of template arguments provided as part of this
/// template-id.
unsigned getNumTemplateArgs() const {
  if (!hasExplicitTemplateArgs())
    return 0;

  return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
}

ArrayRef<TemplateArgumentLoc> template_arguments() const {
  return {getTemplateArgs(), getNumTemplateArgs()};
}

/// Retrieve the member declaration name info.
DeclarationNameInfo getMemberNameInfo() const {
  return DeclarationNameInfo(MemberDecl->getDeclName(),
                             MemberLoc, MemberDNLoc);
}

SourceLocation getOperatorLoc() const { return MemberExprBits.OperatorLoc; }

bool isArrow() const { return MemberExprBits.IsArrow; }
void setArrow(bool A) { MemberExprBits.IsArrow = A; }

/// getMemberLoc - Return the location of the "member", in X->F, it is the
/// location of 'F'.
SourceLocation getMemberLoc() const { return MemberLoc; }
void setMemberLoc(SourceLocation L) { MemberLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

SourceLocation getExprLoc() const LLVM_READONLY__attribute__((__pure__)) { return MemberLoc; }

/// Determine whether the base of this explicit is implicit.
bool isImplicitAccess() const {
  return getBase() && getBase()->isImplicitCXXThis();
}

/// Returns true if this member expression refers to a method that
/// was resolved from an overloaded set having size greater than 1.
bool hadMultipleCandidates() const {
  return MemberExprBits.HadMultipleCandidates;
}
/// Sets the flag telling whether this expression refers to
/// a method that was resolved from an overloaded set having size
/// greater than 1.
void setHadMultipleCandidates(bool V = true) {
  MemberExprBits.HadMultipleCandidates = V;
}

/// Returns true if virtual dispatch is performed.
/// If the member access is fully qualified, (i.e. X::f()), virtual
/// dispatching is not performed. In -fapple-kext mode qualified
/// calls to virtual method will still go through the vtable.
bool performsVirtualDispatch(const LangOptions &LO) const {
  return LO.AppleKext || !hasQualifier();
}

/// Is this expression a non-odr-use reference, and if so, why?
/// This is only meaningful if the named member is a static member.
NonOdrUseReason isNonOdrUse() const {
  return static_cast<NonOdrUseReason>(MemberExprBits.NonOdrUseReason);
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == MemberExprClass;
}

// Iterators
child_range children() { return child_range(&Base, &Base+1); }
const_child_range children() const {
  return const_child_range(&Base, &Base + 1);
}
3048};

3050/// CompoundLiteralExpr - [C99 6.5.2.5]
3051///
3052class CompoundLiteralExpr : public Expr {
/// LParenLoc - If non-null, this is the location of the left paren in a
/// compound literal like "(int){4}".  This can be null if this is a
/// synthesized compound expression.
SourceLocation LParenLoc;

/// The type as written.  This can be an incomplete array type, in
/// which case the actual expression type will be different.
/// The int part of the pair stores whether this expr is file scope.
llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope;
Stmt *Init;
3063public:
CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo,
                    QualType T, ExprValueKind VK, Expr *init, bool fileScope)
  : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary,
         tinfo->getType()->isDependentType(),
         init->isValueDependent(),
         (init->isInstantiationDependent() ||
          tinfo->getType()->isInstantiationDependentType()),
         init->containsUnexpandedParameterPack()),
    LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {}

/// Construct an empty compound literal.
explicit CompoundLiteralExpr(EmptyShell Empty)
  : Expr(CompoundLiteralExprClass, Empty) { }

const Expr *getInitializer() const { return cast<Expr>(Init); }
Expr *getInitializer() { return cast<Expr>(Init); }
void setInitializer(Expr *E) { Init = E; }

bool isFileScope() const { return TInfoAndScope.getInt(); }
void setFileScope(bool FS) { TInfoAndScope.setInt(FS); }

SourceLocation getLParenLoc() const { return LParenLoc; }
void setLParenLoc(SourceLocation L) { LParenLoc = L; }

TypeSourceInfo *getTypeSourceInfo() const {
  return TInfoAndScope.getPointer();
}
void setTypeSourceInfo(TypeSourceInfo *tinfo) {
  TInfoAndScope.setPointer(tinfo);
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  // FIXME: Init should never be null.
  if (!Init)
    return SourceLocation();
  if (LParenLoc.isInvalid())
    return Init->getBeginLoc();
  return LParenLoc;
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  // FIXME: Init should never be null.
  if (!Init)
    return SourceLocation();
  return Init->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == CompoundLiteralExprClass;
}

// Iterators
child_range children() { return child_range(&Init, &Init+1); }
const_child_range children() const {
  return const_child_range(&Init, &Init + 1);
}
3119};

3121/// CastExpr - Base class for type casts, including both implicit
3122/// casts (ImplicitCastExpr) and explicit casts that have some
3123/// representation in the source code (ExplicitCastExpr's derived
3124/// classes).
3125class CastExpr : public Expr {
Stmt *Op;

bool CastConsistency() const;

const CXXBaseSpecifier * const *path_buffer() const {
  return const_cast<CastExpr*>(this)->path_buffer();
}
CXXBaseSpecifier **path_buffer();

3135protected:
CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, const CastKind kind,
         Expr *op, unsigned BasePathSize)
    : Expr(SC, ty, VK, OK_Ordinary,
           // Cast expressions are type-dependent if the type is
           // dependent (C++ [temp.dep.expr]p3).
           ty->isDependentType(),
           // Cast expressions are value-dependent if the type is
           // dependent or if the subexpression is value-dependent.
           ty->isDependentType() || (op && op->isValueDependent()),
           (ty->isInstantiationDependentType() ||
            (op && op->isInstantiationDependent())),
           // An implicit cast expression doesn't (lexically) contain an
           // unexpanded pack, even if its target type does.
           ((SC != ImplicitCastExprClass &&
             ty->containsUnexpandedParameterPack()) ||
            (op && op->containsUnexpandedParameterPack()))),
      Op(op) {
  CastExprBits.Kind = kind;
  CastExprBits.PartOfExplicitCast = false;
  CastExprBits.BasePathSize = BasePathSize;
  assert((CastExprBits.BasePathSize == BasePathSize) &&(((CastExprBits.BasePathSize == BasePathSize) && "BasePathSize overflow!"
) ? static_cast<void> (0) : __assert_fail ("(CastExprBits.BasePathSize == BasePathSize) && \"BasePathSize overflow!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3157, __PRETTY_FUNCTION__))
         "BasePathSize overflow!")(((CastExprBits.BasePathSize == BasePathSize) && "BasePathSize overflow!"
) ? static_cast<void> (0) : __assert_fail ("(CastExprBits.BasePathSize == BasePathSize) && \"BasePathSize overflow!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3157, __PRETTY_FUNCTION__));
  assert(CastConsistency())((CastConsistency()) ? static_cast<void> (0) : __assert_fail
 ("CastConsistency()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3158, __PRETTY_FUNCTION__));
}

/// Construct an empty cast.
CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize)
  : Expr(SC, Empty) {
  CastExprBits.PartOfExplicitCast = false;
  CastExprBits.BasePathSize = BasePathSize;
  assert((CastExprBits.BasePathSize == BasePathSize) &&(((CastExprBits.BasePathSize == BasePathSize) && "BasePathSize overflow!"
) ? static_cast<void> (0) : __assert_fail ("(CastExprBits.BasePathSize == BasePathSize) && \"BasePathSize overflow!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3167, __PRETTY_FUNCTION__))
         "BasePathSize overflow!")(((CastExprBits.BasePathSize == BasePathSize) && "BasePathSize overflow!"
) ? static_cast<void> (0) : __assert_fail ("(CastExprBits.BasePathSize == BasePathSize) && \"BasePathSize overflow!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3167, __PRETTY_FUNCTION__));
}

3170public:
CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; }
void setCastKind(CastKind K) { CastExprBits.Kind = K; }

static const char *getCastKindName(CastKind CK);
const char *getCastKindName() const { return getCastKindName(getCastKind()); }

Expr *getSubExpr() { return cast<Expr>(Op); }
const Expr *getSubExpr() const { return cast<Expr>(Op); }
void setSubExpr(Expr *E) { Op = E; }

/// Retrieve the cast subexpression as it was written in the source
/// code, looking through any implicit casts or other intermediate nodes
/// introduced by semantic analysis.
Expr *getSubExprAsWritten();
const Expr *getSubExprAsWritten() const {
  return const_cast<CastExpr *>(this)->getSubExprAsWritten();
}

/// If this cast applies a user-defined conversion, retrieve the conversion
/// function that it invokes.
NamedDecl *getConversionFunction() const;

typedef CXXBaseSpecifier **path_iterator;
typedef const CXXBaseSpecifier *const *path_const_iterator;
bool path_empty() const { return path_size() == 0; }
unsigned path_size() const { return CastExprBits.BasePathSize; }
path_iterator path_begin() { return path_buffer(); }
path_iterator path_end() { return path_buffer() + path_size(); }
path_const_iterator path_begin() const { return path_buffer(); }
path_const_iterator path_end() const { return path_buffer() + path_size(); }

llvm::iterator_range<path_iterator> path() {
  return llvm::make_range(path_begin(), path_end());
}
llvm::iterator_range<path_const_iterator> path() const {
  return llvm::make_range(path_begin(), path_end());
}

const FieldDecl *getTargetUnionField() const {
  assert(getCastKind() == CK_ToUnion)((getCastKind() == CK_ToUnion) ? static_cast<void> (0) :
 __assert_fail ("getCastKind() == CK_ToUnion", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3210, __PRETTY_FUNCTION__));
  return getTargetFieldForToUnionCast(getType(), getSubExpr()->getType());
}

static const FieldDecl *getTargetFieldForToUnionCast(QualType unionType,
                                                     QualType opType);
static const FieldDecl *getTargetFieldForToUnionCast(const RecordDecl *RD,
                                                     QualType opType);

static bool classof(const Stmt *T) {
  return T->getStmtClass() >= firstCastExprConstant &&
         T->getStmtClass() <= lastCastExprConstant;
}

// Iterators
child_range children() { return child_range(&Op, &Op+1); }
const_child_range children() const { return const_child_range(&Op, &Op + 1); }
3227};

3229/// ImplicitCastExpr - Allows us to explicitly represent implicit type
3230/// conversions, which have no direct representation in the original
3231/// source code. For example: converting T[]->T*, void f()->void
3232/// (*f)(), float->double, short->int, etc.
3233///
3234/// In C, implicit casts always produce rvalues. However, in C++, an
3235/// implicit cast whose result is being bound to a reference will be
3236/// an lvalue or xvalue. For example:
3237///
3238/// @code
3239/// class Base { };
3240/// class Derived : public Base { };
3241/// Derived &&ref();
3242/// void f(Derived d) {
3243///   Base& b = d; // initializer is an ImplicitCastExpr
3244///                // to an lvalue of type Base
3245///   Base&& r = ref(); // initializer is an ImplicitCastExpr
3246///                     // to an xvalue of type Base
3247/// }
3248/// @endcode
3249class ImplicitCastExpr final
  : public CastExpr,
    private llvm::TrailingObjects<ImplicitCastExpr, CXXBaseSpecifier *> {

ImplicitCastExpr(QualType ty, CastKind kind, Expr *op,
                 unsigned BasePathLength, ExprValueKind VK)
  : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { }

/// Construct an empty implicit cast.
explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize)
  : CastExpr(ImplicitCastExprClass, Shell, PathSize) { }

3261public:
enum OnStack_t { OnStack };
ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op,
                 ExprValueKind VK)
  : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) {
}

bool isPartOfExplicitCast() const { return CastExprBits.PartOfExplicitCast; }
void setIsPartOfExplicitCast(bool PartOfExplicitCast) {
  CastExprBits.PartOfExplicitCast = PartOfExplicitCast;
}

static ImplicitCastExpr *Create(const ASTContext &Context, QualType T,
                                CastKind Kind, Expr *Operand,
                                const CXXCastPath *BasePath,
                                ExprValueKind Cat);

static ImplicitCastExpr *CreateEmpty(const ASTContext &Context,
                                     unsigned PathSize);

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSubExpr()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSubExpr()->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ImplicitCastExprClass;
}

friend TrailingObjects;
friend class CastExpr;
3294};

3296/// ExplicitCastExpr - An explicit cast written in the source
3297/// code.
3298///
3299/// This class is effectively an abstract class, because it provides
3300/// the basic representation of an explicitly-written cast without
3301/// specifying which kind of cast (C cast, functional cast, static
3302/// cast, etc.) was written; specific derived classes represent the
3303/// particular style of cast and its location information.
3304///
3305/// Unlike implicit casts, explicit cast nodes have two different
3306/// types: the type that was written into the source code, and the
3307/// actual type of the expression as determined by semantic
3308/// analysis. These types may differ slightly. For example, in C++ one
3309/// can cast to a reference type, which indicates that the resulting
3310/// expression will be an lvalue or xvalue. The reference type, however,
3311/// will not be used as the type of the expression.
3312class ExplicitCastExpr : public CastExpr {
/// TInfo - Source type info for the (written) type
/// this expression is casting to.
TypeSourceInfo *TInfo;

3317protected:
ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK,
                 CastKind kind, Expr *op, unsigned PathSize,
                 TypeSourceInfo *writtenTy)
  : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {}

/// Construct an empty explicit cast.
ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize)
  : CastExpr(SC, Shell, PathSize) { }

3327public:
/// getTypeInfoAsWritten - Returns the type source info for the type
/// that this expression is casting to.
TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; }
void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; }

/// getTypeAsWritten - Returns the type that this expression is
/// casting to, as written in the source code.
QualType getTypeAsWritten() const { return TInfo->getType(); }

static bool classof(const Stmt *T) {
   return T->getStmtClass() >= firstExplicitCastExprConstant &&
          T->getStmtClass() <= lastExplicitCastExprConstant;
}
3341};

3343/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style
3344/// cast in C++ (C++ [expr.cast]), which uses the syntax
3345/// (Type)expr. For example: @c (int)f.
3346class CStyleCastExpr final
  : public ExplicitCastExpr,
    private llvm::TrailingObjects<CStyleCastExpr, CXXBaseSpecifier *> {
SourceLocation LPLoc; // the location of the left paren
SourceLocation RPLoc; // the location of the right paren

CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op,
               unsigned PathSize, TypeSourceInfo *writtenTy,
               SourceLocation l, SourceLocation r)
  : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize,
                     writtenTy), LPLoc(l), RPLoc(r) {}

/// Construct an empty C-style explicit cast.
explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize)
  : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { }

3362public:
static CStyleCastExpr *Create(const ASTContext &Context, QualType T,
                              ExprValueKind VK, CastKind K,
                              Expr *Op, const CXXCastPath *BasePath,
                              TypeSourceInfo *WrittenTy, SourceLocation L,
                              SourceLocation R);

static CStyleCastExpr *CreateEmpty(const ASTContext &Context,
                                   unsigned PathSize);

SourceLocation getLParenLoc() const { return LPLoc; }
void setLParenLoc(SourceLocation L) { LPLoc = L; }

SourceLocation getRParenLoc() const { return RPLoc; }
void setRParenLoc(SourceLocation L) { RPLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LPLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSubExpr()->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == CStyleCastExprClass;
}

friend TrailingObjects;
friend class CastExpr;
3389};

3391/// A builtin binary operation expression such as "x + y" or "x <= y".
3392///
3393/// This expression node kind describes a builtin binary operation,
3394/// such as "x + y" for integer values "x" and "y". The operands will
3395/// already have been converted to appropriate types (e.g., by
3396/// performing promotions or conversions).
3397///
3398/// In C++, where operators may be overloaded, a different kind of
3399/// expression node (CXXOperatorCallExpr) is used to express the
3400/// invocation of an overloaded operator with operator syntax. Within
3401/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is
3402/// used to store an expression "x + y" depends on the subexpressions
3403/// for x and y. If neither x or y is type-dependent, and the "+"
3404/// operator resolves to a built-in operation, BinaryOperator will be
3405/// used to express the computation (x and y may still be
3406/// value-dependent). If either x or y is type-dependent, or if the
3407/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will
3408/// be used to express the computation.
3409class BinaryOperator : public Expr {
enum { LHS, RHS, END_EXPR };
Stmt *SubExprs[END_EXPR];

3413public:
typedef BinaryOperatorKind Opcode;

BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
               ExprValueKind VK, ExprObjectKind OK,
               SourceLocation opLoc, FPOptions FPFeatures)
  : Expr(BinaryOperatorClass, ResTy, VK, OK,
         lhs->isTypeDependent() || rhs->isTypeDependent(),
         lhs->isValueDependent() || rhs->isValueDependent(),
         (lhs->isInstantiationDependent() ||
          rhs->isInstantiationDependent()),
         (lhs->containsUnexpandedParameterPack() ||
          rhs->containsUnexpandedParameterPack())) {
  BinaryOperatorBits.Opc = opc;
  BinaryOperatorBits.FPFeatures = FPFeatures.getInt();
  BinaryOperatorBits.OpLoc = opLoc;
  SubExprs[LHS] = lhs;
  SubExprs[RHS] = rhs;
  assert(!isCompoundAssignmentOp() &&((!isCompoundAssignmentOp() && "Use CompoundAssignOperator for compound assignments"
) ? static_cast<void> (0) : __assert_fail ("!isCompoundAssignmentOp() && \"Use CompoundAssignOperator for compound assignments\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3432, __PRETTY_FUNCTION__))
         "Use CompoundAssignOperator for compound assignments")((!isCompoundAssignmentOp() && "Use CompoundAssignOperator for compound assignments"
) ? static_cast<void> (0) : __assert_fail ("!isCompoundAssignmentOp() && \"Use CompoundAssignOperator for compound assignments\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3432, __PRETTY_FUNCTION__));
}

/// Construct an empty binary operator.
explicit BinaryOperator(EmptyShell Empty) : Expr(BinaryOperatorClass, Empty) {
  BinaryOperatorBits.Opc = BO_Comma;
}

SourceLocation getExprLoc() const { return getOperatorLoc(); }
SourceLocation getOperatorLoc() const { return BinaryOperatorBits.OpLoc; }
void setOperatorLoc(SourceLocation L) { BinaryOperatorBits.OpLoc = L; }

Opcode getOpcode() const {
  return static_cast<Opcode>(BinaryOperatorBits.Opc);
}
void setOpcode(Opcode Opc) { BinaryOperatorBits.Opc = Opc; }

Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
void setLHS(Expr *E) { SubExprs[LHS] = E; }
Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
void setRHS(Expr *E) { SubExprs[RHS] = E; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getLHS()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getRHS()->getEndLoc();
}

/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
/// corresponds to, e.g. "<<=".
static StringRef getOpcodeStr(Opcode Op);

StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); }

/// Retrieve the binary opcode that corresponds to the given
/// overloaded operator.
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO);

/// Retrieve the overloaded operator kind that corresponds to
/// the given binary opcode.
static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);

/// predicates to categorize the respective opcodes.
static bool isPtrMemOp(Opcode Opc) {
  return Opc == BO_PtrMemD || Opc == BO_PtrMemI;
}
bool isPtrMemOp() const { return isPtrMemOp(getOpcode()); }

static bool isMultiplicativeOp(Opcode Opc) {
  return Opc >= BO_Mul && Opc <= BO_Rem;
}
bool isMultiplicativeOp() const { return isMultiplicativeOp(getOpcode()); }
static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; }
bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); }
static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; }
bool isShiftOp() const { return isShiftOp(getOpcode()); }

static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; }
bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); }

static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; }
bool isRelationalOp() const { return isRelationalOp(getOpcode()); }

static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; }
bool isEqualityOp() const { return isEqualityOp(getOpcode()); }

static bool isComparisonOp(Opcode Opc) { return Opc >= BO_Cmp && Opc<=BO_NE; }
9
←
Assuming 'Opc' is < BO_Cmp→
10
←
Returning zero, which participates in a condition later→
bool isComparisonOp() const { return isComparisonOp(getOpcode()); }
8
←
Calling 'BinaryOperator::isComparisonOp'→
11
←
Returning from 'BinaryOperator::isComparisonOp'→
12
←
Returning zero, which participates in a condition later→

static bool isCommaOp(Opcode Opc) { return Opc == BO_Comma; }
bool isCommaOp() const { return isCommaOp(getOpcode()); }

static Opcode negateComparisonOp(Opcode Opc) {
  switch (Opc) {
  default:
    llvm_unreachable("Not a comparison operator.")::llvm::llvm_unreachable_internal("Not a comparison operator."
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3508);
  case BO_LT: return BO_GE;
  case BO_GT: return BO_LE;
  case BO_LE: return BO_GT;
  case BO_GE: return BO_LT;
  case BO_EQ: return BO_NE;
  case BO_NE: return BO_EQ;
  }
}

static Opcode reverseComparisonOp(Opcode Opc) {
  switch (Opc) {
  default:
    llvm_unreachable("Not a comparison operator.")::llvm::llvm_unreachable_internal("Not a comparison operator."
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3521);
  case BO_LT: return BO_GT;
  case BO_GT: return BO_LT;
  case BO_LE: return BO_GE;
  case BO_GE: return BO_LE;
  case BO_EQ:
  case BO_NE:
    return Opc;
  }
}

static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; }
bool isLogicalOp() const { return isLogicalOp(getOpcode()); }

static bool isAssignmentOp(Opcode Opc) {
  return Opc >= BO_Assign && Opc <= BO_OrAssign;
}
bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); }

static bool isCompoundAssignmentOp(Opcode Opc) {
  return Opc > BO_Assign && Opc <= BO_OrAssign;
}
bool isCompoundAssignmentOp() const {
  return isCompoundAssignmentOp(getOpcode());
}
static Opcode getOpForCompoundAssignment(Opcode Opc) {
  assert(isCompoundAssignmentOp(Opc))((isCompoundAssignmentOp(Opc)) ? static_cast<void> (0) :
 __assert_fail ("isCompoundAssignmentOp(Opc)", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3547, __PRETTY_FUNCTION__));
  if (Opc >= BO_AndAssign)
    return Opcode(unsigned(Opc) - BO_AndAssign + BO_And);
  else
    return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul);
}

static bool isShiftAssignOp(Opcode Opc) {
  return Opc == BO_ShlAssign || Opc == BO_ShrAssign;
}
bool isShiftAssignOp() const {
  return isShiftAssignOp(getOpcode());
}

// Return true if a binary operator using the specified opcode and operands
// would match the 'p = (i8*)nullptr + n' idiom for casting a pointer-sized
// integer to a pointer.
static bool isNullPointerArithmeticExtension(ASTContext &Ctx, Opcode Opc,
                                             Expr *LHS, Expr *RHS);

static bool classof(const Stmt *S) {
  return S->getStmtClass() >= firstBinaryOperatorConstant &&
         S->getStmtClass() <= lastBinaryOperatorConstant;
}

// Iterators
child_range children() {
  return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
}
const_child_range children() const {
  return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
}

// Set the FP contractability status of this operator. Only meaningful for
// operations on floating point types.
void setFPFeatures(FPOptions F) {
  BinaryOperatorBits.FPFeatures = F.getInt();
}

FPOptions getFPFeatures() const {
  return FPOptions(BinaryOperatorBits.FPFeatures);
}

// Get the FP contractability status of this operator. Only meaningful for
// operations on floating point types.
bool isFPContractableWithinStatement() const {
  return getFPFeatures().allowFPContractWithinStatement();
}

// Get the FENV_ACCESS status of this operator. Only meaningful for
// operations on floating point types.
bool isFEnvAccessOn() const { return getFPFeatures().allowFEnvAccess(); }

3600protected:
BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
               ExprValueKind VK, ExprObjectKind OK,
               SourceLocation opLoc, FPOptions FPFeatures, bool dead2)
  : Expr(CompoundAssignOperatorClass, ResTy, VK, OK,
         lhs->isTypeDependent() || rhs->isTypeDependent(),
         lhs->isValueDependent() || rhs->isValueDependent(),
         (lhs->isInstantiationDependent() ||
          rhs->isInstantiationDependent()),
         (lhs->containsUnexpandedParameterPack() ||
          rhs->containsUnexpandedParameterPack())) {
  BinaryOperatorBits.Opc = opc;
  BinaryOperatorBits.FPFeatures = FPFeatures.getInt();
  BinaryOperatorBits.OpLoc = opLoc;
  SubExprs[LHS] = lhs;
  SubExprs[RHS] = rhs;
}

BinaryOperator(StmtClass SC, EmptyShell Empty) : Expr(SC, Empty) {
  BinaryOperatorBits.Opc = BO_MulAssign;
}
3621};

3623/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep
3624/// track of the type the operation is performed in.  Due to the semantics of
3625/// these operators, the operands are promoted, the arithmetic performed, an
3626/// implicit conversion back to the result type done, then the assignment takes
3627/// place.  This captures the intermediate type which the computation is done
3628/// in.
3629class CompoundAssignOperator : public BinaryOperator {
QualType ComputationLHSType;
QualType ComputationResultType;
3632public:
CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType,
                       ExprValueKind VK, ExprObjectKind OK,
                       QualType CompLHSType, QualType CompResultType,
                       SourceLocation OpLoc, FPOptions FPFeatures)
  : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, FPFeatures,
                   true),
    ComputationLHSType(CompLHSType),
    ComputationResultType(CompResultType) {
  assert(isCompoundAssignmentOp() &&((isCompoundAssignmentOp() && "Only should be used for compound assignments"
) ? static_cast<void> (0) : __assert_fail ("isCompoundAssignmentOp() && \"Only should be used for compound assignments\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3642, __PRETTY_FUNCTION__))
         "Only should be used for compound assignments")((isCompoundAssignmentOp() && "Only should be used for compound assignments"
) ? static_cast<void> (0) : __assert_fail ("isCompoundAssignmentOp() && \"Only should be used for compound assignments\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3642, __PRETTY_FUNCTION__));
}

/// Build an empty compound assignment operator expression.
explicit CompoundAssignOperator(EmptyShell Empty)
  : BinaryOperator(CompoundAssignOperatorClass, Empty) { }

// The two computation types are the type the LHS is converted
// to for the computation and the type of the result; the two are
// distinct in a few cases (specifically, int+=ptr and ptr-=ptr).
QualType getComputationLHSType() const { return ComputationLHSType; }
void setComputationLHSType(QualType T) { ComputationLHSType = T; }

QualType getComputationResultType() const { return ComputationResultType; }
void setComputationResultType(QualType T) { ComputationResultType = T; }

static bool classof(const Stmt *S) {
  return S->getStmtClass() == CompoundAssignOperatorClass;
}
3661};

3663/// AbstractConditionalOperator - An abstract base class for
3664/// ConditionalOperator and BinaryConditionalOperator.
3665class AbstractConditionalOperator : public Expr {
SourceLocation QuestionLoc, ColonLoc;
friend class ASTStmtReader;

3669protected:
AbstractConditionalOperator(StmtClass SC, QualType T,
                            ExprValueKind VK, ExprObjectKind OK,
                            bool TD, bool VD, bool ID,
                            bool ContainsUnexpandedParameterPack,
                            SourceLocation qloc,
                            SourceLocation cloc)
  : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack),
    QuestionLoc(qloc), ColonLoc(cloc) {}

AbstractConditionalOperator(StmtClass SC, EmptyShell Empty)
  : Expr(SC, Empty) { }

3682public:
// getCond - Return the expression representing the condition for
//   the ?: operator.
Expr *getCond() const;

// getTrueExpr - Return the subexpression representing the value of
//   the expression if the condition evaluates to true.
Expr *getTrueExpr() const;

// getFalseExpr - Return the subexpression representing the value of
//   the expression if the condition evaluates to false.  This is
//   the same as getRHS.
Expr *getFalseExpr() const;

SourceLocation getQuestionLoc() const { return QuestionLoc; }
SourceLocation getColonLoc() const { return ColonLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ConditionalOperatorClass ||
         T->getStmtClass() == BinaryConditionalOperatorClass;
}
3703};

3705/// ConditionalOperator - The ?: ternary operator.  The GNU "missing
3706/// middle" extension is a BinaryConditionalOperator.
3707class ConditionalOperator : public AbstractConditionalOperator {
enum { COND, LHS, RHS, END_EXPR };
Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.

friend class ASTStmtReader;
3712public:
ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs,
                    SourceLocation CLoc, Expr *rhs,
                    QualType t, ExprValueKind VK, ExprObjectKind OK)
  : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK,
         // FIXME: the type of the conditional operator doesn't
         // depend on the type of the conditional, but the standard
         // seems to imply that it could. File a bug!
         (lhs->isTypeDependent() || rhs->isTypeDependent()),
         (cond->isValueDependent() || lhs->isValueDependent() ||
          rhs->isValueDependent()),
         (cond->isInstantiationDependent() ||
          lhs->isInstantiationDependent() ||
          rhs->isInstantiationDependent()),
         (cond->containsUnexpandedParameterPack() ||
          lhs->containsUnexpandedParameterPack() ||
          rhs->containsUnexpandedParameterPack()),
                                QLoc, CLoc) {
  SubExprs[COND] = cond;
  SubExprs[LHS] = lhs;
  SubExprs[RHS] = rhs;
}

/// Build an empty conditional operator.
explicit ConditionalOperator(EmptyShell Empty)
  : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { }

// getCond - Return the expression representing the condition for
//   the ?: operator.
Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }

// getTrueExpr - Return the subexpression representing the value of
//   the expression if the condition evaluates to true.
Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); }

// getFalseExpr - Return the subexpression representing the value of
//   the expression if the condition evaluates to false.  This is
//   the same as getRHS.
Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); }

Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getCond()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getRHS()->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ConditionalOperatorClass;
}

// Iterators
child_range children() {
  return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
}
const_child_range children() const {
  return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
}
3773};

3775/// BinaryConditionalOperator - The GNU extension to the conditional
3776/// operator which allows the middle operand to be omitted.
3777///
3778/// This is a different expression kind on the assumption that almost
3779/// every client ends up needing to know that these are different.
3780class BinaryConditionalOperator : public AbstractConditionalOperator {
enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS };

/// - the common condition/left-hand-side expression, which will be
///   evaluated as the opaque value
/// - the condition, expressed in terms of the opaque value
/// - the left-hand-side, expressed in terms of the opaque value
/// - the right-hand-side
Stmt *SubExprs[NUM_SUBEXPRS];
OpaqueValueExpr *OpaqueValue;

friend class ASTStmtReader;
3792public:
BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue,
                          Expr *cond, Expr *lhs, Expr *rhs,
                          SourceLocation qloc, SourceLocation cloc,
                          QualType t, ExprValueKind VK, ExprObjectKind OK)
  : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK,
         (common->isTypeDependent() || rhs->isTypeDependent()),
         (common->isValueDependent() || rhs->isValueDependent()),
         (common->isInstantiationDependent() ||
          rhs->isInstantiationDependent()),
         (common->containsUnexpandedParameterPack() ||
          rhs->containsUnexpandedParameterPack()),
                                qloc, cloc),
    OpaqueValue(opaqueValue) {
  SubExprs[COMMON] = common;
  SubExprs[COND] = cond;
  SubExprs[LHS] = lhs;
  SubExprs[RHS] = rhs;
  assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value")((OpaqueValue->getSourceExpr() == common && "Wrong opaque value"
) ? static_cast<void> (0) : __assert_fail ("OpaqueValue->getSourceExpr() == common && \"Wrong opaque value\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 3810, __PRETTY_FUNCTION__));
}

/// Build an empty conditional operator.
explicit BinaryConditionalOperator(EmptyShell Empty)
  : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { }

/// getCommon - Return the common expression, written to the
///   left of the condition.  The opaque value will be bound to the
///   result of this expression.
Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); }

/// getOpaqueValue - Return the opaque value placeholder.
OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; }

/// getCond - Return the condition expression; this is defined
///   in terms of the opaque value.
Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }

/// getTrueExpr - Return the subexpression which will be
///   evaluated if the condition evaluates to true;  this is defined
///   in terms of the opaque value.
Expr *getTrueExpr() const {
  return cast<Expr>(SubExprs[LHS]);
}

/// getFalseExpr - Return the subexpression which will be
///   evaluated if the condnition evaluates to false; this is
///   defined in terms of the opaque value.
Expr *getFalseExpr() const {
  return cast<Expr>(SubExprs[RHS]);
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getCommon()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getFalseExpr()->getEndLoc();
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == BinaryConditionalOperatorClass;
}

// Iterators
child_range children() {
  return child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
}
const_child_range children() const {
  return const_child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
}
3861};

3863inline Expr *AbstractConditionalOperator::getCond() const {
if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
  return co->getCond();
return cast<BinaryConditionalOperator>(this)->getCond();
3867}

3869inline Expr *AbstractConditionalOperator::getTrueExpr() const {
if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
  return co->getTrueExpr();
return cast<BinaryConditionalOperator>(this)->getTrueExpr();
3873}

3875inline Expr *AbstractConditionalOperator::getFalseExpr() const {
if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
  return co->getFalseExpr();
return cast<BinaryConditionalOperator>(this)->getFalseExpr();
3879}

3881/// AddrLabelExpr - The GNU address of label extension, representing &&label.
3882class AddrLabelExpr : public Expr {
SourceLocation AmpAmpLoc, LabelLoc;
LabelDecl *Label;
3885public:
AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L,
              QualType t)
  : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false,
         false),
    AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {}

/// Build an empty address of a label expression.
explicit AddrLabelExpr(EmptyShell Empty)
  : Expr(AddrLabelExprClass, Empty) { }

SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; }
void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; }
SourceLocation getLabelLoc() const { return LabelLoc; }
void setLabelLoc(SourceLocation L) { LabelLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return AmpAmpLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return LabelLoc; }

LabelDecl *getLabel() const { return Label; }
void setLabel(LabelDecl *L) { Label = L; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == AddrLabelExprClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
3918};

3920/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
3921/// The StmtExpr contains a single CompoundStmt node, which it evaluates and
3922/// takes the value of the last subexpression.
3923///
3924/// A StmtExpr is always an r-value; values "returned" out of a
3925/// StmtExpr will be copied.
3926class StmtExpr : public Expr {
Stmt *SubStmt;
SourceLocation LParenLoc, RParenLoc;
3929public:
// FIXME: Does type-dependence need to be computed differently?
// FIXME: Do we need to compute instantiation instantiation-dependence for
// statements? (ugh!)
StmtExpr(CompoundStmt *substmt, QualType T,
         SourceLocation lp, SourceLocation rp) :
  Expr(StmtExprClass, T, VK_RValue, OK_Ordinary,
       T->isDependentType(), false, false, false),
  SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { }

/// Build an empty statement expression.
explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { }

CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); }
const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); }
void setSubStmt(CompoundStmt *S) { SubStmt = S; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LParenLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

SourceLocation getLParenLoc() const { return LParenLoc; }
void setLParenLoc(SourceLocation L) { LParenLoc = L; }
SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == StmtExprClass;
}

// Iterators
child_range children() { return child_range(&SubStmt, &SubStmt+1); }
const_child_range children() const {
  return const_child_range(&SubStmt, &SubStmt + 1);
}
3963};

3965/// ShuffleVectorExpr - clang-specific builtin-in function
3966/// __builtin_shufflevector.
3967/// This AST node represents a operator that does a constant
3968/// shuffle, similar to LLVM's shufflevector instruction. It takes
3969/// two vectors and a variable number of constant indices,
3970/// and returns the appropriately shuffled vector.
3971class ShuffleVectorExpr : public Expr {
SourceLocation BuiltinLoc, RParenLoc;

// SubExprs - the list of values passed to the __builtin_shufflevector
// function. The first two are vectors, and the rest are constant
// indices.  The number of values in this list is always
// 2+the number of indices in the vector type.
Stmt **SubExprs;
unsigned NumExprs;

3981public:
ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args, QualType Type,
                  SourceLocation BLoc, SourceLocation RP);

/// Build an empty vector-shuffle expression.
explicit ShuffleVectorExpr(EmptyShell Empty)
  : Expr(ShuffleVectorExprClass, Empty), SubExprs(nullptr) { }

SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }

SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ShuffleVectorExprClass;
}

/// getNumSubExprs - Return the size of the SubExprs array.  This includes the
/// constant expression, the actual arguments passed in, and the function
/// pointers.
unsigned getNumSubExprs() const { return NumExprs; }

/// Retrieve the array of expressions.
Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }

/// getExpr - Return the Expr at the specified index.
Expr *getExpr(unsigned Index) {
  assert((Index < NumExprs) && "Arg access out of range!")(((Index < NumExprs) && "Arg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("(Index < NumExprs) && \"Arg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4012, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[Index]);
}
const Expr *getExpr(unsigned Index) const {
  assert((Index < NumExprs) && "Arg access out of range!")(((Index < NumExprs) && "Arg access out of range!"
) ? static_cast<void> (0) : __assert_fail ("(Index < NumExprs) && \"Arg access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4016, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[Index]);
}

void setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs);

llvm::APSInt getShuffleMaskIdx(const ASTContext &Ctx, unsigned N) const {
  assert((N < NumExprs - 2) && "Shuffle idx out of range!")(((N < NumExprs - 2) && "Shuffle idx out of range!"
) ? static_cast<void> (0) : __assert_fail ("(N < NumExprs - 2) && \"Shuffle idx out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4023, __PRETTY_FUNCTION__));
  return getExpr(N+2)->EvaluateKnownConstInt(Ctx);
}

// Iterators
child_range children() {
  return child_range(&SubExprs[0], &SubExprs[0]+NumExprs);
}
const_child_range children() const {
  return const_child_range(&SubExprs[0], &SubExprs[0] + NumExprs);
}
4034};

4036/// ConvertVectorExpr - Clang builtin function __builtin_convertvector
4037/// This AST node provides support for converting a vector type to another
4038/// vector type of the same arity.
4039class ConvertVectorExpr : public Expr {
4040private:
Stmt *SrcExpr;
TypeSourceInfo *TInfo;
SourceLocation BuiltinLoc, RParenLoc;

friend class ASTReader;
friend class ASTStmtReader;
explicit ConvertVectorExpr(EmptyShell Empty) : Expr(ConvertVectorExprClass, Empty) {}

4049public:
ConvertVectorExpr(Expr* SrcExpr, TypeSourceInfo *TI, QualType DstType,
           ExprValueKind VK, ExprObjectKind OK,
           SourceLocation BuiltinLoc, SourceLocation RParenLoc)
  : Expr(ConvertVectorExprClass, DstType, VK, OK,
         DstType->isDependentType(),
         DstType->isDependentType() || SrcExpr->isValueDependent(),
         (DstType->isInstantiationDependentType() ||
          SrcExpr->isInstantiationDependent()),
         (DstType->containsUnexpandedParameterPack() ||
          SrcExpr->containsUnexpandedParameterPack())),
SrcExpr(SrcExpr), TInfo(TI), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {}

/// getSrcExpr - Return the Expr to be converted.
Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }

/// getTypeSourceInfo - Return the destination type.
TypeSourceInfo *getTypeSourceInfo() const {
  return TInfo;
}
void setTypeSourceInfo(TypeSourceInfo *ti) {
  TInfo = ti;
}

/// getBuiltinLoc - Return the location of the __builtin_convertvector token.
SourceLocation getBuiltinLoc() const { return BuiltinLoc; }

/// getRParenLoc - Return the location of final right parenthesis.
SourceLocation getRParenLoc() const { return RParenLoc; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ConvertVectorExprClass;
}

// Iterators
child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
const_child_range children() const {
  return const_child_range(&SrcExpr, &SrcExpr + 1);
}
4091};

4093/// ChooseExpr - GNU builtin-in function __builtin_choose_expr.
4094/// This AST node is similar to the conditional operator (?:) in C, with
4095/// the following exceptions:
4096/// - the test expression must be a integer constant expression.
4097/// - the expression returned acts like the chosen subexpression in every
4098///   visible way: the type is the same as that of the chosen subexpression,
4099///   and all predicates (whether it's an l-value, whether it's an integer
4100///   constant expression, etc.) return the same result as for the chosen
4101///   sub-expression.
4102class ChooseExpr : public Expr {
enum { COND, LHS, RHS, END_EXPR };
Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
SourceLocation BuiltinLoc, RParenLoc;
bool CondIsTrue;
4107public:
ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs,
           QualType t, ExprValueKind VK, ExprObjectKind OK,
           SourceLocation RP, bool condIsTrue,
           bool TypeDependent, bool ValueDependent)
  : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent,
         (cond->isInstantiationDependent() ||
          lhs->isInstantiationDependent() ||
          rhs->isInstantiationDependent()),
         (cond->containsUnexpandedParameterPack() ||
          lhs->containsUnexpandedParameterPack() ||
          rhs->containsUnexpandedParameterPack())),
    BuiltinLoc(BLoc), RParenLoc(RP), CondIsTrue(condIsTrue) {
    SubExprs[COND] = cond;
    SubExprs[LHS] = lhs;
    SubExprs[RHS] = rhs;
  }

/// Build an empty __builtin_choose_expr.
explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { }

/// isConditionTrue - Return whether the condition is true (i.e. not
/// equal to zero).
bool isConditionTrue() const {
  assert(!isConditionDependent() &&((!isConditionDependent() && "Dependent condition isn't true or false"
) ? static_cast<void> (0) : __assert_fail ("!isConditionDependent() && \"Dependent condition isn't true or false\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4132, __PRETTY_FUNCTION__))
         "Dependent condition isn't true or false")((!isConditionDependent() && "Dependent condition isn't true or false"
) ? static_cast<void> (0) : __assert_fail ("!isConditionDependent() && \"Dependent condition isn't true or false\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4132, __PRETTY_FUNCTION__));
  return CondIsTrue;
}
void setIsConditionTrue(bool isTrue) { CondIsTrue = isTrue; }

bool isConditionDependent() const {
  return getCond()->isTypeDependent() || getCond()->isValueDependent();
}

/// getChosenSubExpr - Return the subexpression chosen according to the
/// condition.
Expr *getChosenSubExpr() const {
  return isConditionTrue() ? getLHS() : getRHS();
}

Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
void setCond(Expr *E) { SubExprs[COND] = E; }
Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
void setLHS(Expr *E) { SubExprs[LHS] = E; }
Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
void setRHS(Expr *E) { SubExprs[RHS] = E; }

SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }

SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ChooseExprClass;
}

// Iterators
child_range children() {
  return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
}
const_child_range children() const {
  return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
}
4174};

4176/// GNUNullExpr - Implements the GNU __null extension, which is a name
4177/// for a null pointer constant that has integral type (e.g., int or
4178/// long) and is the same size and alignment as a pointer. The __null
4179/// extension is typically only used by system headers, which define
4180/// NULL as __null in C++ rather than using 0 (which is an integer
4181/// that may not match the size of a pointer).
4182class GNUNullExpr : public Expr {
/// TokenLoc - The location of the __null keyword.
SourceLocation TokenLoc;

4186public:
GNUNullExpr(QualType Ty, SourceLocation Loc)
  : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false,
         false),
    TokenLoc(Loc) { }

/// Build an empty GNU __null expression.
explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { }

/// getTokenLocation - The location of the __null token.
SourceLocation getTokenLocation() const { return TokenLoc; }
void setTokenLocation(SourceLocation L) { TokenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return TokenLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return TokenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == GNUNullExprClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
4213};

4215/// Represents a call to the builtin function \c __builtin_va_arg.
4216class VAArgExpr : public Expr {
Stmt *Val;
llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfo;
SourceLocation BuiltinLoc, RParenLoc;
4220public:
VAArgExpr(SourceLocation BLoc, Expr *e, TypeSourceInfo *TInfo,
          SourceLocation RPLoc, QualType t, bool IsMS)
    : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, t->isDependentType(),
           false, (TInfo->getType()->isInstantiationDependentType() ||
                   e->isInstantiationDependent()),
           (TInfo->getType()->containsUnexpandedParameterPack() ||
            e->containsUnexpandedParameterPack())),
      Val(e), TInfo(TInfo, IsMS), BuiltinLoc(BLoc), RParenLoc(RPLoc) {}

/// Create an empty __builtin_va_arg expression.
explicit VAArgExpr(EmptyShell Empty)
    : Expr(VAArgExprClass, Empty), Val(nullptr), TInfo(nullptr, false) {}

const Expr *getSubExpr() const { return cast<Expr>(Val); }
Expr *getSubExpr() { return cast<Expr>(Val); }
void setSubExpr(Expr *E) { Val = E; }

/// Returns whether this is really a Win64 ABI va_arg expression.
bool isMicrosoftABI() const { return TInfo.getInt(); }
void setIsMicrosoftABI(bool IsMS) { TInfo.setInt(IsMS); }

TypeSourceInfo *getWrittenTypeInfo() const { return TInfo.getPointer(); }
void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo.setPointer(TI); }

SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }

SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == VAArgExprClass;
}

// Iterators
child_range children() { return child_range(&Val, &Val+1); }
const_child_range children() const {
  return const_child_range(&Val, &Val + 1);
}
4263};

4265/// Represents a function call to one of __builtin_LINE(), __builtin_COLUMN(),
4266/// __builtin_FUNCTION(), or __builtin_FILE().
4267class SourceLocExpr final : public Expr {
SourceLocation BuiltinLoc, RParenLoc;
DeclContext *ParentContext;

4271public:
enum IdentKind { Function, File, Line, Column };

SourceLocExpr(const ASTContext &Ctx, IdentKind Type, SourceLocation BLoc,
              SourceLocation RParenLoc, DeclContext *Context);

/// Build an empty call expression.
explicit SourceLocExpr(EmptyShell Empty) : Expr(SourceLocExprClass, Empty) {}

/// Return the result of evaluating this SourceLocExpr in the specified
/// (and possibly null) default argument or initialization context.
APValue EvaluateInContext(const ASTContext &Ctx,
                          const Expr *DefaultExpr) const;

/// Return a string representing the name of the specific builtin function.
StringRef getBuiltinStr() const;

IdentKind getIdentKind() const {
  return static_cast<IdentKind>(SourceLocExprBits.Kind);
}

bool isStringType() const {
  switch (getIdentKind()) {
  case File:
  case Function:
    return true;
  case Line:
  case Column:
    return false;
  }
  llvm_unreachable("unknown source location expression kind")::llvm::llvm_unreachable_internal("unknown source location expression kind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4301);
}
bool isIntType() const LLVM_READONLY__attribute__((__pure__)) { return !isStringType(); }

/// If the SourceLocExpr has been resolved return the subexpression
/// representing the resolved value. Otherwise return null.
const DeclContext *getParentContext() const { return ParentContext; }
DeclContext *getParentContext() { return ParentContext; }

SourceLocation getLocation() const { return BuiltinLoc; }
SourceLocation getBeginLoc() const { return BuiltinLoc; }
SourceLocation getEndLoc() const { return RParenLoc; }

child_range children() {
  return child_range(child_iterator(), child_iterator());
}

const_child_range children() const {
  return const_child_range(child_iterator(), child_iterator());
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == SourceLocExprClass;
}

4326private:
friend class ASTStmtReader;
4328};

4330/// Describes an C or C++ initializer list.
4331///
4332/// InitListExpr describes an initializer list, which can be used to
4333/// initialize objects of different types, including
4334/// struct/class/union types, arrays, and vectors. For example:
4335///
4336/// @code
4337/// struct foo x = { 1, { 2, 3 } };
4338/// @endcode
4339///
4340/// Prior to semantic analysis, an initializer list will represent the
4341/// initializer list as written by the user, but will have the
4342/// placeholder type "void". This initializer list is called the
4343/// syntactic form of the initializer, and may contain C99 designated
4344/// initializers (represented as DesignatedInitExprs), initializations
4345/// of subobject members without explicit braces, and so on. Clients
4346/// interested in the original syntax of the initializer list should
4347/// use the syntactic form of the initializer list.
4348///
4349/// After semantic analysis, the initializer list will represent the
4350/// semantic form of the initializer, where the initializations of all
4351/// subobjects are made explicit with nested InitListExpr nodes and
4352/// C99 designators have been eliminated by placing the designated
4353/// initializations into the subobject they initialize. Additionally,
4354/// any "holes" in the initialization, where no initializer has been
4355/// specified for a particular subobject, will be replaced with
4356/// implicitly-generated ImplicitValueInitExpr expressions that
4357/// value-initialize the subobjects. Note, however, that the
4358/// initializer lists may still have fewer initializers than there are
4359/// elements to initialize within the object.
4360///
4361/// After semantic analysis has completed, given an initializer list,
4362/// method isSemanticForm() returns true if and only if this is the
4363/// semantic form of the initializer list (note: the same AST node
4364/// may at the same time be the syntactic form).
4365/// Given the semantic form of the initializer list, one can retrieve
4366/// the syntactic form of that initializer list (when different)
4367/// using method getSyntacticForm(); the method returns null if applied
4368/// to a initializer list which is already in syntactic form.
4369/// Similarly, given the syntactic form (i.e., an initializer list such
4370/// that isSemanticForm() returns false), one can retrieve the semantic
4371/// form using method getSemanticForm().
4372/// Since many initializer lists have the same syntactic and semantic forms,
4373/// getSyntacticForm() may return NULL, indicating that the current
4374/// semantic initializer list also serves as its syntactic form.
4375class InitListExpr : public Expr {
// FIXME: Eliminate this vector in favor of ASTContext allocation
typedef ASTVector<Stmt *> InitExprsTy;
InitExprsTy InitExprs;
SourceLocation LBraceLoc, RBraceLoc;

/// The alternative form of the initializer list (if it exists).
/// The int part of the pair stores whether this initializer list is
/// in semantic form. If not null, the pointer points to:
///   - the syntactic form, if this is in semantic form;
///   - the semantic form, if this is in syntactic form.
llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm;

/// Either:
///  If this initializer list initializes an array with more elements than
///  there are initializers in the list, specifies an expression to be used
///  for value initialization of the rest of the elements.
/// Or
///  If this initializer list initializes a union, specifies which
///  field within the union will be initialized.
llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit;

4397public:
InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
             ArrayRef<Expr*> initExprs, SourceLocation rbraceloc);

/// Build an empty initializer list.
explicit InitListExpr(EmptyShell Empty)
  : Expr(InitListExprClass, Empty), AltForm(nullptr, true) { }

unsigned getNumInits() const { return InitExprs.size(); }

/// Retrieve the set of initializers.
Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); }

/// Retrieve the set of initializers.
Expr * const *getInits() const {
  return reinterpret_cast<Expr * const *>(InitExprs.data());
}

ArrayRef<Expr *> inits() {
  return llvm::makeArrayRef(getInits(), getNumInits());
}

ArrayRef<Expr *> inits() const {
  return llvm::makeArrayRef(getInits(), getNumInits());
}

const Expr *getInit(unsigned Init) const {
  assert(Init < getNumInits() && "Initializer access out of range!")((Init < getNumInits() && "Initializer access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Init < getNumInits() && \"Initializer access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4424, __PRETTY_FUNCTION__));
  return cast_or_null<Expr>(InitExprs[Init]);
}

Expr *getInit(unsigned Init) {
  assert(Init < getNumInits() && "Initializer access out of range!")((Init < getNumInits() && "Initializer access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Init < getNumInits() && \"Initializer access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4429, __PRETTY_FUNCTION__));
  return cast_or_null<Expr>(InitExprs[Init]);
}

void setInit(unsigned Init, Expr *expr) {
  assert(Init < getNumInits() && "Initializer access out of range!")((Init < getNumInits() && "Initializer access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Init < getNumInits() && \"Initializer access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4434, __PRETTY_FUNCTION__));
  InitExprs[Init] = expr;

  if (expr) {
    ExprBits.TypeDependent |= expr->isTypeDependent();
    ExprBits.ValueDependent |= expr->isValueDependent();
    ExprBits.InstantiationDependent |= expr->isInstantiationDependent();
    ExprBits.ContainsUnexpandedParameterPack |=
        expr->containsUnexpandedParameterPack();
  }
}

/// Reserve space for some number of initializers.
void reserveInits(const ASTContext &C, unsigned NumInits);

/// Specify the number of initializers
///
/// If there are more than @p NumInits initializers, the remaining
/// initializers will be destroyed. If there are fewer than @p
/// NumInits initializers, NULL expressions will be added for the
/// unknown initializers.
void resizeInits(const ASTContext &Context, unsigned NumInits);

/// Updates the initializer at index @p Init with the new
/// expression @p expr, and returns the old expression at that
/// location.
///
/// When @p Init is out of range for this initializer list, the
/// initializer list will be extended with NULL expressions to
/// accommodate the new entry.
Expr *updateInit(const ASTContext &C, unsigned Init, Expr *expr);

/// If this initializer list initializes an array with more elements
/// than there are initializers in the list, specifies an expression to be
/// used for value initialization of the rest of the elements.
Expr *getArrayFiller() {
  return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>();
}
const Expr *getArrayFiller() const {
  return const_cast<InitListExpr *>(this)->getArrayFiller();
}
void setArrayFiller(Expr *filler);

/// Return true if this is an array initializer and its array "filler"
/// has been set.
bool hasArrayFiller() const { return getArrayFiller(); }

/// If this initializes a union, specifies which field in the
/// union to initialize.
///
/// Typically, this field is the first named field within the
/// union. However, a designated initializer can specify the
/// initialization of a different field within the union.
FieldDecl *getInitializedFieldInUnion() {
  return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>();
}
const FieldDecl *getInitializedFieldInUnion() const {
  return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion();
}
void setInitializedFieldInUnion(FieldDecl *FD) {
  assert((FD == nullptr(((FD == nullptr || getInitializedFieldInUnion() == nullptr ||
 getInitializedFieldInUnion() == FD) && "Only one field of a union may be initialized at a time!"
) ? static_cast<void> (0) : __assert_fail ("(FD == nullptr || getInitializedFieldInUnion() == nullptr || getInitializedFieldInUnion() == FD) && \"Only one field of a union may be initialized at a time!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4497, __PRETTY_FUNCTION__))
          || getInitializedFieldInUnion() == nullptr(((FD == nullptr || getInitializedFieldInUnion() == nullptr ||
 getInitializedFieldInUnion() == FD) && "Only one field of a union may be initialized at a time!"
) ? static_cast<void> (0) : __assert_fail ("(FD == nullptr || getInitializedFieldInUnion() == nullptr || getInitializedFieldInUnion() == FD) && \"Only one field of a union may be initialized at a time!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4497, __PRETTY_FUNCTION__))
          || getInitializedFieldInUnion() == FD)(((FD == nullptr || getInitializedFieldInUnion() == nullptr ||
 getInitializedFieldInUnion() == FD) && "Only one field of a union may be initialized at a time!"
) ? static_cast<void> (0) : __assert_fail ("(FD == nullptr || getInitializedFieldInUnion() == nullptr || getInitializedFieldInUnion() == FD) && \"Only one field of a union may be initialized at a time!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4497, __PRETTY_FUNCTION__))
         && "Only one field of a union may be initialized at a time!")(((FD == nullptr || getInitializedFieldInUnion() == nullptr ||
 getInitializedFieldInUnion() == FD) && "Only one field of a union may be initialized at a time!"
) ? static_cast<void> (0) : __assert_fail ("(FD == nullptr || getInitializedFieldInUnion() == nullptr || getInitializedFieldInUnion() == FD) && \"Only one field of a union may be initialized at a time!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4497, __PRETTY_FUNCTION__));
  ArrayFillerOrUnionFieldInit = FD;
}

// Explicit InitListExpr's originate from source code (and have valid source
// locations). Implicit InitListExpr's are created by the semantic analyzer.
// FIXME: This is wrong; InitListExprs created by semantic analysis have
// valid source locations too!
bool isExplicit() const {
  return LBraceLoc.isValid() && RBraceLoc.isValid();
}

// Is this an initializer for an array of characters, initialized by a string
// literal or an @encode?
bool isStringLiteralInit() const;

/// Is this a transparent initializer list (that is, an InitListExpr that is
/// purely syntactic, and whose semantics are that of the sole contained
/// initializer)?
bool isTransparent() const;

/// Is this the zero initializer {0} in a language which considers it
/// idiomatic?
bool isIdiomaticZeroInitializer(const LangOptions &LangOpts) const;

SourceLocation getLBraceLoc() const { return LBraceLoc; }
void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; }
SourceLocation getRBraceLoc() const { return RBraceLoc; }
void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; }

bool isSemanticForm() const { return AltForm.getInt(); }
InitListExpr *getSemanticForm() const {
  return isSemanticForm() ? nullptr : AltForm.getPointer();
}
bool isSyntacticForm() const {
  return !AltForm.getInt() || !AltForm.getPointer();
}
InitListExpr *getSyntacticForm() const {
  return isSemanticForm() ? AltForm.getPointer() : nullptr;
}

void setSyntacticForm(InitListExpr *Init) {
  AltForm.setPointer(Init);
  AltForm.setInt(true);
  Init->AltForm.setPointer(this);
  Init->AltForm.setInt(false);
}

bool hadArrayRangeDesignator() const {
  return InitListExprBits.HadArrayRangeDesignator != 0;
}
void sawArrayRangeDesignator(bool ARD = true) {
  InitListExprBits.HadArrayRangeDesignator = ARD;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

static bool classof(const Stmt *T) {
  return T->getStmtClass() == InitListExprClass;
}

// Iterators
child_range children() {
  const_child_range CCR = const_cast<const InitListExpr *>(this)->children();
  return child_range(cast_away_const(CCR.begin()),
                     cast_away_const(CCR.end()));
}

const_child_range children() const {
  // FIXME: This does not include the array filler expression.
  if (InitExprs.empty())
    return const_child_range(const_child_iterator(), const_child_iterator());
  return const_child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size());
}

typedef InitExprsTy::iterator iterator;
typedef InitExprsTy::const_iterator const_iterator;
typedef InitExprsTy::reverse_iterator reverse_iterator;
typedef InitExprsTy::const_reverse_iterator const_reverse_iterator;

iterator begin() { return InitExprs.begin(); }
const_iterator begin() const { return InitExprs.begin(); }
iterator end() { return InitExprs.end(); }
const_iterator end() const { return InitExprs.end(); }
reverse_iterator rbegin() { return InitExprs.rbegin(); }
const_reverse_iterator rbegin() const { return InitExprs.rbegin(); }
reverse_iterator rend() { return InitExprs.rend(); }
const_reverse_iterator rend() const { return InitExprs.rend(); }

friend class ASTStmtReader;
friend class ASTStmtWriter;
4589};

4591/// Represents a C99 designated initializer expression.
4592///
4593/// A designated initializer expression (C99 6.7.8) contains one or
4594/// more designators (which can be field designators, array
4595/// designators, or GNU array-range designators) followed by an
4596/// expression that initializes the field or element(s) that the
4597/// designators refer to. For example, given:
4598///
4599/// @code
4600/// struct point {
4601///   double x;
4602///   double y;
4603/// };
4604/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 };
4605/// @endcode
4606///
4607/// The InitListExpr contains three DesignatedInitExprs, the first of
4608/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two
4609/// designators, one array designator for @c [2] followed by one field
4610/// designator for @c .y. The initialization expression will be 1.0.
4611class DesignatedInitExpr final
  : public Expr,
    private llvm::TrailingObjects<DesignatedInitExpr, Stmt *> {
4614public:
/// Forward declaration of the Designator class.
class Designator;

4618private:
/// The location of the '=' or ':' prior to the actual initializer
/// expression.
SourceLocation EqualOrColonLoc;

/// Whether this designated initializer used the GNU deprecated
/// syntax rather than the C99 '=' syntax.
unsigned GNUSyntax : 1;

/// The number of designators in this initializer expression.
unsigned NumDesignators : 15;

/// The number of subexpressions of this initializer expression,
/// which contains both the initializer and any additional
/// expressions used by array and array-range designators.
unsigned NumSubExprs : 16;

/// The designators in this designated initialization
/// expression.
Designator *Designators;

DesignatedInitExpr(const ASTContext &C, QualType Ty,
                   llvm::ArrayRef<Designator> Designators,
                   SourceLocation EqualOrColonLoc, bool GNUSyntax,
                   ArrayRef<Expr *> IndexExprs, Expr *Init);

explicit DesignatedInitExpr(unsigned NumSubExprs)
  : Expr(DesignatedInitExprClass, EmptyShell()),
    NumDesignators(0), NumSubExprs(NumSubExprs), Designators(nullptr) { }

4648public:
/// A field designator, e.g., ".x".
struct FieldDesignator {
  /// Refers to the field that is being initialized. The low bit
  /// of this field determines whether this is actually a pointer
  /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When
  /// initially constructed, a field designator will store an
  /// IdentifierInfo*. After semantic analysis has resolved that
  /// name, the field designator will instead store a FieldDecl*.
  uintptr_t NameOrField;

  /// The location of the '.' in the designated initializer.
  unsigned DotLoc;

  /// The location of the field name in the designated initializer.
  unsigned FieldLoc;
};

/// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
struct ArrayOrRangeDesignator {
  /// Location of the first index expression within the designated
  /// initializer expression's list of subexpressions.
  unsigned Index;
  /// The location of the '[' starting the array range designator.
  unsigned LBracketLoc;
  /// The location of the ellipsis separating the start and end
  /// indices. Only valid for GNU array-range designators.
  unsigned EllipsisLoc;
  /// The location of the ']' terminating the array range designator.
  unsigned RBracketLoc;
};

/// Represents a single C99 designator.
///
/// @todo This class is infuriatingly similar to clang::Designator,
/// but minor differences (storing indices vs. storing pointers)
/// keep us from reusing it. Try harder, later, to rectify these
/// differences.
class Designator {
  /// The kind of designator this describes.
  enum {
    FieldDesignator,
    ArrayDesignator,
    ArrayRangeDesignator
  } Kind;

  union {
    /// A field designator, e.g., ".x".
    struct FieldDesignator Field;
    /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
    struct ArrayOrRangeDesignator ArrayOrRange;
  };
  friend class DesignatedInitExpr;

public:
  Designator() {}

  /// Initializes a field designator.
  Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc,
             SourceLocation FieldLoc)
    : Kind(FieldDesignator) {
    Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01;
    Field.DotLoc = DotLoc.getRawEncoding();
    Field.FieldLoc = FieldLoc.getRawEncoding();
  }

  /// Initializes an array designator.
  Designator(unsigned Index, SourceLocation LBracketLoc,
             SourceLocation RBracketLoc)
    : Kind(ArrayDesignator) {
    ArrayOrRange.Index = Index;
    ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
    ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding();
    ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
  }

  /// Initializes a GNU array-range designator.
  Designator(unsigned Index, SourceLocation LBracketLoc,
             SourceLocation EllipsisLoc, SourceLocation RBracketLoc)
    : Kind(ArrayRangeDesignator) {
    ArrayOrRange.Index = Index;
    ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
    ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding();
    ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
  }

  bool isFieldDesignator() const { return Kind == FieldDesignator; }
  bool isArrayDesignator() const { return Kind == ArrayDesignator; }
  bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; }

  IdentifierInfo *getFieldName() const;

  FieldDecl *getField() const {
    assert(Kind == FieldDesignator && "Only valid on a field designator")((Kind == FieldDesignator && "Only valid on a field designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == FieldDesignator && \"Only valid on a field designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4741, __PRETTY_FUNCTION__));
    if (Field.NameOrField & 0x01)
      return nullptr;
    else
      return reinterpret_cast<FieldDecl *>(Field.NameOrField);
  }

  void setField(FieldDecl *FD) {
    assert(Kind == FieldDesignator && "Only valid on a field designator")((Kind == FieldDesignator && "Only valid on a field designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == FieldDesignator && \"Only valid on a field designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4749, __PRETTY_FUNCTION__));
    Field.NameOrField = reinterpret_cast<uintptr_t>(FD);
  }

  SourceLocation getDotLoc() const {
    assert(Kind == FieldDesignator && "Only valid on a field designator")((Kind == FieldDesignator && "Only valid on a field designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == FieldDesignator && \"Only valid on a field designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4754, __PRETTY_FUNCTION__));
    return SourceLocation::getFromRawEncoding(Field.DotLoc);
  }

  SourceLocation getFieldLoc() const {
    assert(Kind == FieldDesignator && "Only valid on a field designator")((Kind == FieldDesignator && "Only valid on a field designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == FieldDesignator && \"Only valid on a field designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4759, __PRETTY_FUNCTION__));
    return SourceLocation::getFromRawEncoding(Field.FieldLoc);
  }

  SourceLocation getLBracketLoc() const {
    assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4765, __PRETTY_FUNCTION__))
           "Only valid on an array or array-range designator")(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4765, __PRETTY_FUNCTION__));
    return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc);
  }

  SourceLocation getRBracketLoc() const {
    assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4771, __PRETTY_FUNCTION__))
           "Only valid on an array or array-range designator")(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4771, __PRETTY_FUNCTION__));
    return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc);
  }

  SourceLocation getEllipsisLoc() const {
    assert(Kind == ArrayRangeDesignator &&((Kind == ArrayRangeDesignator && "Only valid on an array-range designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == ArrayRangeDesignator && \"Only valid on an array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4777, __PRETTY_FUNCTION__))
           "Only valid on an array-range designator")((Kind == ArrayRangeDesignator && "Only valid on an array-range designator"
) ? static_cast<void> (0) : __assert_fail ("Kind == ArrayRangeDesignator && \"Only valid on an array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4777, __PRETTY_FUNCTION__));
    return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc);
  }

  unsigned getFirstExprIndex() const {
    assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4783, __PRETTY_FUNCTION__))
           "Only valid on an array or array-range designator")(((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
 "Only valid on an array or array-range designator") ? static_cast
<void> (0) : __assert_fail ("(Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && \"Only valid on an array or array-range designator\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4783, __PRETTY_FUNCTION__));
    return ArrayOrRange.Index;
  }

  SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
    if (Kind == FieldDesignator)
      return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc();
    else
      return getLBracketLoc();
  }
  SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
    return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc();
  }
  SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) {
    return SourceRange(getBeginLoc(), getEndLoc());
  }
};

static DesignatedInitExpr *Create(const ASTContext &C,
                                  llvm::ArrayRef<Designator> Designators,
                                  ArrayRef<Expr*> IndexExprs,
                                  SourceLocation EqualOrColonLoc,
                                  bool GNUSyntax, Expr *Init);

static DesignatedInitExpr *CreateEmpty(const ASTContext &C,
                                       unsigned NumIndexExprs);

/// Returns the number of designators in this initializer.
unsigned size() const { return NumDesignators; }

// Iterator access to the designators.
llvm::MutableArrayRef<Designator> designators() {
  return {Designators, NumDesignators};
}

llvm::ArrayRef<Designator> designators() const {
  return {Designators, NumDesignators};
}

Designator *getDesignator(unsigned Idx) { return &designators()[Idx]; }
const Designator *getDesignator(unsigned Idx) const {
  return &designators()[Idx];
}

void setDesignators(const ASTContext &C, const Designator *Desigs,
                    unsigned NumDesigs);

Expr *getArrayIndex(const Designator &D) const;
Expr *getArrayRangeStart(const Designator &D) const;
Expr *getArrayRangeEnd(const Designator &D) const;

/// Retrieve the location of the '=' that precedes the
/// initializer value itself, if present.
SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; }
void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; }

/// Whether this designated initializer should result in direct-initialization
/// of the designated subobject (eg, '{.foo{1, 2, 3}}').
bool isDirectInit() const { return EqualOrColonLoc.isInvalid(); }

/// Determines whether this designated initializer used the
/// deprecated GNU syntax for designated initializers.
bool usesGNUSyntax() const { return GNUSyntax; }
void setGNUSyntax(bool GNU) { GNUSyntax = GNU; }

/// Retrieve the initializer value.
Expr *getInit() const {
  return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin());
}

void setInit(Expr *init) {
  *child_begin() = init;
}

/// Retrieve the total number of subexpressions in this
/// designated initializer expression, including the actual
/// initialized value and any expressions that occur within array
/// and array-range designators.
unsigned getNumSubExprs() const { return NumSubExprs; }

Expr *getSubExpr(unsigned Idx) const {
  assert(Idx < NumSubExprs && "Subscript out of range")((Idx < NumSubExprs && "Subscript out of range") ?
 static_cast<void> (0) : __assert_fail ("Idx < NumSubExprs && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4864, __PRETTY_FUNCTION__));
  return cast<Expr>(getTrailingObjects<Stmt *>()[Idx]);
}

void setSubExpr(unsigned Idx, Expr *E) {
  assert(Idx < NumSubExprs && "Subscript out of range")((Idx < NumSubExprs && "Subscript out of range") ?
 static_cast<void> (0) : __assert_fail ("Idx < NumSubExprs && \"Subscript out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 4869, __PRETTY_FUNCTION__));
  getTrailingObjects<Stmt *>()[Idx] = E;
}

/// Replaces the designator at index @p Idx with the series
/// of designators in [First, Last).
void ExpandDesignator(const ASTContext &C, unsigned Idx,
                      const Designator *First, const Designator *Last);

SourceRange getDesignatorsSourceRange() const;

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

static bool classof(const Stmt *T) {
  return T->getStmtClass() == DesignatedInitExprClass;
}

// Iterators
child_range children() {
  Stmt **begin = getTrailingObjects<Stmt *>();
  return child_range(begin, begin + NumSubExprs);
}
const_child_range children() const {
  Stmt * const *begin = getTrailingObjects<Stmt *>();
  return const_child_range(begin, begin + NumSubExprs);
}

friend TrailingObjects;
4898};

4900/// Represents a place-holder for an object not to be initialized by
4901/// anything.
4902///
4903/// This only makes sense when it appears as part of an updater of a
4904/// DesignatedInitUpdateExpr (see below). The base expression of a DIUE
4905/// initializes a big object, and the NoInitExpr's mark the spots within the
4906/// big object not to be overwritten by the updater.
4907///
4908/// \see DesignatedInitUpdateExpr
4909class NoInitExpr : public Expr {
4910public:
explicit NoInitExpr(QualType ty)
  : Expr(NoInitExprClass, ty, VK_RValue, OK_Ordinary,
         false, false, ty->isInstantiationDependentType(), false) { }

explicit NoInitExpr(EmptyShell Empty)
  : Expr(NoInitExprClass, Empty) { }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == NoInitExprClass;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
4932};

4934// In cases like:
4935//   struct Q { int a, b, c; };
4936//   Q *getQ();
4937//   void foo() {
4938//     struct A { Q q; } a = { *getQ(), .q.b = 3 };
4939//   }
4940//
4941// We will have an InitListExpr for a, with type A, and then a
4942// DesignatedInitUpdateExpr for "a.q" with type Q. The "base" for this DIUE
4943// is the call expression *getQ(); the "updater" for the DIUE is ".q.b = 3"
4944//
4945class DesignatedInitUpdateExpr : public Expr {
// BaseAndUpdaterExprs[0] is the base expression;
// BaseAndUpdaterExprs[1] is an InitListExpr overwriting part of the base.
Stmt *BaseAndUpdaterExprs[2];

4950public:
DesignatedInitUpdateExpr(const ASTContext &C, SourceLocation lBraceLoc,
                         Expr *baseExprs, SourceLocation rBraceLoc);

explicit DesignatedInitUpdateExpr(EmptyShell Empty)
  : Expr(DesignatedInitUpdateExprClass, Empty) { }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__));
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__));

static bool classof(const Stmt *T) {
  return T->getStmtClass() == DesignatedInitUpdateExprClass;
}

Expr *getBase() const { return cast<Expr>(BaseAndUpdaterExprs[0]); }
void setBase(Expr *Base) { BaseAndUpdaterExprs[0] = Base; }

InitListExpr *getUpdater() const {
  return cast<InitListExpr>(BaseAndUpdaterExprs[1]);
}
void setUpdater(Expr *Updater) { BaseAndUpdaterExprs[1] = Updater; }

// Iterators
// children = the base and the updater
child_range children() {
  return child_range(&BaseAndUpdaterExprs[0], &BaseAndUpdaterExprs[0] + 2);
}
const_child_range children() const {
  return const_child_range(&BaseAndUpdaterExprs[0],
                           &BaseAndUpdaterExprs[0] + 2);
}
4981};

4983/// Represents a loop initializing the elements of an array.
4984///
4985/// The need to initialize the elements of an array occurs in a number of
4986/// contexts:
4987///
4988///  * in the implicit copy/move constructor for a class with an array member
4989///  * when a lambda-expression captures an array by value
4990///  * when a decomposition declaration decomposes an array
4991///
4992/// There are two subexpressions: a common expression (the source array)
4993/// that is evaluated once up-front, and a per-element initializer that
4994/// runs once for each array element.
4995///
4996/// Within the per-element initializer, the common expression may be referenced
4997/// via an OpaqueValueExpr, and the current index may be obtained via an
4998/// ArrayInitIndexExpr.
4999class ArrayInitLoopExpr : public Expr {
Stmt *SubExprs[2];

explicit ArrayInitLoopExpr(EmptyShell Empty)
    : Expr(ArrayInitLoopExprClass, Empty), SubExprs{} {}

5005public:
explicit ArrayInitLoopExpr(QualType T, Expr *CommonInit, Expr *ElementInit)
    : Expr(ArrayInitLoopExprClass, T, VK_RValue, OK_Ordinary, false,
           CommonInit->isValueDependent() || ElementInit->isValueDependent(),
           T->isInstantiationDependentType(),
           CommonInit->containsUnexpandedParameterPack() ||
               ElementInit->containsUnexpandedParameterPack()),
      SubExprs{CommonInit, ElementInit} {}

/// Get the common subexpression shared by all initializations (the source
/// array).
OpaqueValueExpr *getCommonExpr() const {
  return cast<OpaqueValueExpr>(SubExprs[0]);
}

/// Get the initializer to use for each array element.
Expr *getSubExpr() const { return cast<Expr>(SubExprs[1]); }

llvm::APInt getArraySize() const {
  return cast<ConstantArrayType>(getType()->castAsArrayTypeUnsafe())
      ->getSize();
}

static bool classof(const Stmt *S) {
  return S->getStmtClass() == ArrayInitLoopExprClass;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getCommonExpr()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getCommonExpr()->getEndLoc();
}

child_range children() {
  return child_range(SubExprs, SubExprs + 2);
}
const_child_range children() const {
  return const_child_range(SubExprs, SubExprs + 2);
}

friend class ASTReader;
friend class ASTStmtReader;
friend class ASTStmtWriter;
5049};

5051/// Represents the index of the current element of an array being
5052/// initialized by an ArrayInitLoopExpr. This can only appear within the
5053/// subexpression of an ArrayInitLoopExpr.
5054class ArrayInitIndexExpr : public Expr {
explicit ArrayInitIndexExpr(EmptyShell Empty)
    : Expr(ArrayInitIndexExprClass, Empty) {}

5058public:
explicit ArrayInitIndexExpr(QualType T)
    : Expr(ArrayInitIndexExprClass, T, VK_RValue, OK_Ordinary,
           false, false, false, false) {}

static bool classof(const Stmt *S) {
  return S->getStmtClass() == ArrayInitIndexExprClass;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }

child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}

friend class ASTReader;
friend class ASTStmtReader;
5079};

5081/// Represents an implicitly-generated value initialization of
5082/// an object of a given type.
5083///
5084/// Implicit value initializations occur within semantic initializer
5085/// list expressions (InitListExpr) as placeholders for subobject
5086/// initializations not explicitly specified by the user.
5087///
5088/// \see InitListExpr
5089class ImplicitValueInitExpr : public Expr {
5090public:
explicit ImplicitValueInitExpr(QualType ty)
  : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary,
         false, false, ty->isInstantiationDependentType(), false) { }

/// Construct an empty implicit value initialization.
explicit ImplicitValueInitExpr(EmptyShell Empty)
  : Expr(ImplicitValueInitExprClass, Empty) { }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ImplicitValueInitExprClass;
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
5113};

5115class ParenListExpr final
  : public Expr,
    private llvm::TrailingObjects<ParenListExpr, Stmt *> {
friend class ASTStmtReader;
friend TrailingObjects;

/// The location of the left and right parentheses.
SourceLocation LParenLoc, RParenLoc;

/// Build a paren list.
ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
              SourceLocation RParenLoc);

/// Build an empty paren list.
ParenListExpr(EmptyShell Empty, unsigned NumExprs);

5131public:
/// Create a paren list.
static ParenListExpr *Create(const ASTContext &Ctx, SourceLocation LParenLoc,
                             ArrayRef<Expr *> Exprs,
                             SourceLocation RParenLoc);

/// Create an empty paren list.
static ParenListExpr *CreateEmpty(const ASTContext &Ctx, unsigned NumExprs);

/// Return the number of expressions in this paren list.
unsigned getNumExprs() const { return ParenListExprBits.NumExprs; }

Expr *getExpr(unsigned Init) {
  assert(Init < getNumExprs() && "Initializer access out of range!")((Init < getNumExprs() && "Initializer access out of range!"
) ? static_cast<void> (0) : __assert_fail ("Init < getNumExprs() && \"Initializer access out of range!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5144, __PRETTY_FUNCTION__));
  return getExprs()[Init];
}

const Expr *getExpr(unsigned Init) const {
  return const_cast<ParenListExpr *>(this)->getExpr(Init);
}

Expr **getExprs() {
  return reinterpret_cast<Expr **>(getTrailingObjects<Stmt *>());
}

ArrayRef<Expr *> exprs() {
  return llvm::makeArrayRef(getExprs(), getNumExprs());
}

SourceLocation getLParenLoc() const { return LParenLoc; }
SourceLocation getRParenLoc() const { return RParenLoc; }
SourceLocation getBeginLoc() const { return getLParenLoc(); }
SourceLocation getEndLoc() const { return getRParenLoc(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ParenListExprClass;
}

// Iterators
child_range children() {
  return child_range(getTrailingObjects<Stmt *>(),
                     getTrailingObjects<Stmt *>() + getNumExprs());
}
const_child_range children() const {
  return const_child_range(getTrailingObjects<Stmt *>(),
                           getTrailingObjects<Stmt *>() + getNumExprs());
}
5178};

5180/// Represents a C11 generic selection.
5181///
5182/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling
5183/// expression, followed by one or more generic associations.  Each generic
5184/// association specifies a type name and an expression, or "default" and an
5185/// expression (in which case it is known as a default generic association).
5186/// The type and value of the generic selection are identical to those of its
5187/// result expression, which is defined as the expression in the generic
5188/// association with a type name that is compatible with the type of the
5189/// controlling expression, or the expression in the default generic association
5190/// if no types are compatible.  For example:
5191///
5192/// @code
5193/// _Generic(X, double: 1, float: 2, default: 3)
5194/// @endcode
5195///
5196/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f
5197/// or 3 if "hello".
5198///
5199/// As an extension, generic selections are allowed in C++, where the following
5200/// additional semantics apply:
5201///
5202/// Any generic selection whose controlling expression is type-dependent or
5203/// which names a dependent type in its association list is result-dependent,
5204/// which means that the choice of result expression is dependent.
5205/// Result-dependent generic associations are both type- and value-dependent.
5206class GenericSelectionExpr final
  : public Expr,
    private llvm::TrailingObjects<GenericSelectionExpr, Stmt *,
                                  TypeSourceInfo *> {
friend class ASTStmtReader;
friend class ASTStmtWriter;
friend TrailingObjects;

/// The number of association expressions and the index of the result
/// expression in the case where the generic selection expression is not
/// result-dependent. The result index is equal to ResultDependentIndex
/// if and only if the generic selection expression is result-dependent.
unsigned NumAssocs, ResultIndex;
enum : unsigned {
  ResultDependentIndex = std::numeric_limits<unsigned>::max(),
  ControllingIndex = 0,
  AssocExprStartIndex = 1
};

/// The location of the "default" and of the right parenthesis.
SourceLocation DefaultLoc, RParenLoc;

// GenericSelectionExpr is followed by several trailing objects.
// They are (in order):
//
// * A single Stmt * for the controlling expression.
// * An array of getNumAssocs() Stmt * for the association expressions.
// * An array of getNumAssocs() TypeSourceInfo *, one for each of the
//   association expressions.
unsigned numTrailingObjects(OverloadToken<Stmt *>) const {
  // Add one to account for the controlling expression; the remainder
  // are the associated expressions.
  return 1 + getNumAssocs();
}

unsigned numTrailingObjects(OverloadToken<TypeSourceInfo *>) const {
  return getNumAssocs();
}

template <bool Const> class AssociationIteratorTy;
/// Bundle together an association expression and its TypeSourceInfo.
/// The Const template parameter is for the const and non-const versions
/// of AssociationTy.
template <bool Const> class AssociationTy {
  friend class GenericSelectionExpr;
  template <bool OtherConst> friend class AssociationIteratorTy;
  using ExprPtrTy =
      typename std::conditional<Const, const Expr *, Expr *>::type;
  using TSIPtrTy = typename std::conditional<Const, const TypeSourceInfo *,
                                             TypeSourceInfo *>::type;
  ExprPtrTy E;
  TSIPtrTy TSI;
  bool Selected;
  AssociationTy(ExprPtrTy E, TSIPtrTy TSI, bool Selected)
      : E(E), TSI(TSI), Selected(Selected) {}

public:
  ExprPtrTy getAssociationExpr() const { return E; }
  TSIPtrTy getTypeSourceInfo() const { return TSI; }
  QualType getType() const { return TSI ? TSI->getType() : QualType(); }
  bool isSelected() const { return Selected; }
  AssociationTy *operator->() { return this; }
  const AssociationTy *operator->() const { return this; }
}; // class AssociationTy

/// Iterator over const and non-const Association objects. The Association
/// objects are created on the fly when the iterator is dereferenced.
/// This abstract over how exactly the association expressions and the
/// corresponding TypeSourceInfo * are stored.
template <bool Const>
class AssociationIteratorTy
    : public llvm::iterator_facade_base<
          AssociationIteratorTy<Const>, std::input_iterator_tag,
          AssociationTy<Const>, std::ptrdiff_t, AssociationTy<Const>,
          AssociationTy<Const>> {
  friend class GenericSelectionExpr;
  // FIXME: This iterator could conceptually be a random access iterator, and
  // it would be nice if we could strengthen the iterator category someday.
  // However this iterator does not satisfy two requirements of forward
  // iterators:
  // a) reference = T& or reference = const T&
  // b) If It1 and It2 are both dereferenceable, then It1 == It2 if and only
  //    if *It1 and *It2 are bound to the same objects.
  // An alternative design approach was discussed during review;
  // store an Association object inside the iterator, and return a reference
  // to it when dereferenced. This idea was discarded beacuse of nasty
  // lifetime issues:
  //    AssociationIterator It = ...;
  //    const Association &Assoc = *It++; // Oops, Assoc is dangling.
  using BaseTy = typename AssociationIteratorTy::iterator_facade_base;
  using StmtPtrPtrTy =
      typename std::conditional<Const, const Stmt *const *, Stmt **>::type;
  using TSIPtrPtrTy =
      typename std::conditional<Const, const TypeSourceInfo *const *,
                                TypeSourceInfo **>::type;
  StmtPtrPtrTy E; // = nullptr; FIXME: Once support for gcc 4.8 is dropped.
  TSIPtrPtrTy TSI; // Kept in sync with E.
  unsigned Offset = 0, SelectedOffset = 0;
  AssociationIteratorTy(StmtPtrPtrTy E, TSIPtrPtrTy TSI, unsigned Offset,
                        unsigned SelectedOffset)
      : E(E), TSI(TSI), Offset(Offset), SelectedOffset(SelectedOffset) {}

public:
  AssociationIteratorTy() : E(nullptr), TSI(nullptr) {}
  typename BaseTy::reference operator*() const {
    return AssociationTy<Const>(cast<Expr>(*E), *TSI,
                                Offset == SelectedOffset);
  }
  typename BaseTy::pointer operator->() const { return **this; }
  using BaseTy::operator++;
  AssociationIteratorTy &operator++() {
    ++E;
    ++TSI;
    ++Offset;
    return *this;
  }
  bool operator==(AssociationIteratorTy Other) const { return E == Other.E; }
}; // class AssociationIterator

/// Build a non-result-dependent generic selection expression.
GenericSelectionExpr(const ASTContext &Context, SourceLocation GenericLoc,
                     Expr *ControllingExpr,
                     ArrayRef<TypeSourceInfo *> AssocTypes,
                     ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
                     SourceLocation RParenLoc,
                     bool ContainsUnexpandedParameterPack,
                     unsigned ResultIndex);

/// Build a result-dependent generic selection expression.
GenericSelectionExpr(const ASTContext &Context, SourceLocation GenericLoc,
                     Expr *ControllingExpr,
                     ArrayRef<TypeSourceInfo *> AssocTypes,
                     ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
                     SourceLocation RParenLoc,
                     bool ContainsUnexpandedParameterPack);

/// Build an empty generic selection expression for deserialization.
explicit GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs);

5345public:
/// Create a non-result-dependent generic selection expression.
static GenericSelectionExpr *
Create(const ASTContext &Context, SourceLocation GenericLoc,
       Expr *ControllingExpr, ArrayRef<TypeSourceInfo *> AssocTypes,
       ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
       SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
       unsigned ResultIndex);

/// Create a result-dependent generic selection expression.
static GenericSelectionExpr *
Create(const ASTContext &Context, SourceLocation GenericLoc,
       Expr *ControllingExpr, ArrayRef<TypeSourceInfo *> AssocTypes,
       ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
       SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack);

/// Create an empty generic selection expression for deserialization.
static GenericSelectionExpr *CreateEmpty(const ASTContext &Context,
                                         unsigned NumAssocs);

using Association = AssociationTy<false>;
using ConstAssociation = AssociationTy<true>;
using AssociationIterator = AssociationIteratorTy<false>;
using ConstAssociationIterator = AssociationIteratorTy<true>;
using association_range = llvm::iterator_range<AssociationIterator>;
using const_association_range =
    llvm::iterator_range<ConstAssociationIterator>;

/// The number of association expressions.
unsigned getNumAssocs() const { return NumAssocs; }

/// The zero-based index of the result expression's generic association in
/// the generic selection's association list.  Defined only if the
/// generic selection is not result-dependent.
unsigned getResultIndex() const {
  assert(!isResultDependent() &&((!isResultDependent() && "Generic selection is result-dependent but getResultIndex called!"
) ? static_cast<void> (0) : __assert_fail ("!isResultDependent() && \"Generic selection is result-dependent but getResultIndex called!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5381, __PRETTY_FUNCTION__))
         "Generic selection is result-dependent but getResultIndex called!")((!isResultDependent() && "Generic selection is result-dependent but getResultIndex called!"
) ? static_cast<void> (0) : __assert_fail ("!isResultDependent() && \"Generic selection is result-dependent but getResultIndex called!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5381, __PRETTY_FUNCTION__));
  return ResultIndex;
}

/// Whether this generic selection is result-dependent.
bool isResultDependent() const { return ResultIndex == ResultDependentIndex; }

/// Return the controlling expression of this generic selection expression.
Expr *getControllingExpr() {
  return cast<Expr>(getTrailingObjects<Stmt *>()[ControllingIndex]);
}
const Expr *getControllingExpr() const {
  return cast<Expr>(getTrailingObjects<Stmt *>()[ControllingIndex]);
}

/// Return the result expression of this controlling expression. Defined if
/// and only if the generic selection expression is not result-dependent.
Expr *getResultExpr() {
  return cast<Expr>(
      getTrailingObjects<Stmt *>()[AssocExprStartIndex + getResultIndex()]);
}
const Expr *getResultExpr() const {
  return cast<Expr>(
      getTrailingObjects<Stmt *>()[AssocExprStartIndex + getResultIndex()]);
}

ArrayRef<Expr *> getAssocExprs() const {
  return {reinterpret_cast<Expr *const *>(getTrailingObjects<Stmt *>() +
                                          AssocExprStartIndex),
          NumAssocs};
}
ArrayRef<TypeSourceInfo *> getAssocTypeSourceInfos() const {
  return {getTrailingObjects<TypeSourceInfo *>(), NumAssocs};
}

/// Return the Ith association expression with its TypeSourceInfo,
/// bundled together in GenericSelectionExpr::(Const)Association.
Association getAssociation(unsigned I) {
  assert(I < getNumAssocs() &&((I < getNumAssocs() && "Out-of-range index in GenericSelectionExpr::getAssociation!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumAssocs() && \"Out-of-range index in GenericSelectionExpr::getAssociation!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5420, __PRETTY_FUNCTION__))
         "Out-of-range index in GenericSelectionExpr::getAssociation!")((I < getNumAssocs() && "Out-of-range index in GenericSelectionExpr::getAssociation!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumAssocs() && \"Out-of-range index in GenericSelectionExpr::getAssociation!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5420, __PRETTY_FUNCTION__));
  return Association(
      cast<Expr>(getTrailingObjects<Stmt *>()[AssocExprStartIndex + I]),
      getTrailingObjects<TypeSourceInfo *>()[I],
      !isResultDependent() && (getResultIndex() == I));
}
ConstAssociation getAssociation(unsigned I) const {
  assert(I < getNumAssocs() &&((I < getNumAssocs() && "Out-of-range index in GenericSelectionExpr::getAssociation!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumAssocs() && \"Out-of-range index in GenericSelectionExpr::getAssociation!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5428, __PRETTY_FUNCTION__))
         "Out-of-range index in GenericSelectionExpr::getAssociation!")((I < getNumAssocs() && "Out-of-range index in GenericSelectionExpr::getAssociation!"
) ? static_cast<void> (0) : __assert_fail ("I < getNumAssocs() && \"Out-of-range index in GenericSelectionExpr::getAssociation!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5428, __PRETTY_FUNCTION__));
  return ConstAssociation(
      cast<Expr>(getTrailingObjects<Stmt *>()[AssocExprStartIndex + I]),
      getTrailingObjects<TypeSourceInfo *>()[I],
      !isResultDependent() && (getResultIndex() == I));
}

association_range associations() {
  AssociationIterator Begin(getTrailingObjects<Stmt *>() +
                                AssocExprStartIndex,
                            getTrailingObjects<TypeSourceInfo *>(),
                            /*Offset=*/0, ResultIndex);
  AssociationIterator End(Begin.E + NumAssocs, Begin.TSI + NumAssocs,
                          /*Offset=*/NumAssocs, ResultIndex);
  return llvm::make_range(Begin, End);
}

const_association_range associations() const {
  ConstAssociationIterator Begin(getTrailingObjects<Stmt *>() +
                                     AssocExprStartIndex,
                                 getTrailingObjects<TypeSourceInfo *>(),
                                 /*Offset=*/0, ResultIndex);
  ConstAssociationIterator End(Begin.E + NumAssocs, Begin.TSI + NumAssocs,
                               /*Offset=*/NumAssocs, ResultIndex);
  return llvm::make_range(Begin, End);
}

SourceLocation getGenericLoc() const {
  return GenericSelectionExprBits.GenericLoc;
}
SourceLocation getDefaultLoc() const { return DefaultLoc; }
SourceLocation getRParenLoc() const { return RParenLoc; }
SourceLocation getBeginLoc() const { return getGenericLoc(); }
SourceLocation getEndLoc() const { return getRParenLoc(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == GenericSelectionExprClass;
}

child_range children() {
  return child_range(getTrailingObjects<Stmt *>(),
                     getTrailingObjects<Stmt *>() +
                         numTrailingObjects(OverloadToken<Stmt *>()));
}
const_child_range children() const {
  return const_child_range(getTrailingObjects<Stmt *>(),
                           getTrailingObjects<Stmt *>() +
                               numTrailingObjects(OverloadToken<Stmt *>()));
}
5477};

5479//===----------------------------------------------------------------------===//
5480// Clang Extensions
5481//===----------------------------------------------------------------------===//

5483/// ExtVectorElementExpr - This represents access to specific elements of a
5484/// vector, and may occur on the left hand side or right hand side.  For example
5485/// the following is legal:  "V.xy = V.zw" if V is a 4 element extended vector.
5486///
5487/// Note that the base may have either vector or pointer to vector type, just
5488/// like a struct field reference.
5489///
5490class ExtVectorElementExpr : public Expr {
Stmt *Base;
IdentifierInfo *Accessor;
SourceLocation AccessorLoc;
5494public:
ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base,
                     IdentifierInfo &accessor, SourceLocation loc)
  : Expr(ExtVectorElementExprClass, ty, VK,
         (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent),
         base->isTypeDependent(), base->isValueDependent(),
         base->isInstantiationDependent(),
         base->containsUnexpandedParameterPack()),
    Base(base), Accessor(&accessor), AccessorLoc(loc) {}

/// Build an empty vector element expression.
explicit ExtVectorElementExpr(EmptyShell Empty)
  : Expr(ExtVectorElementExprClass, Empty) { }

const Expr *getBase() const { return cast<Expr>(Base); }
Expr *getBase() { return cast<Expr>(Base); }
void setBase(Expr *E) { Base = E; }

IdentifierInfo &getAccessor() const { return *Accessor; }
void setAccessor(IdentifierInfo *II) { Accessor = II; }

SourceLocation getAccessorLoc() const { return AccessorLoc; }
void setAccessorLoc(SourceLocation L) { AccessorLoc = L; }

/// getNumElements - Get the number of components being selected.
unsigned getNumElements() const;

/// containsDuplicateElements - Return true if any element access is
/// repeated.
bool containsDuplicateElements() const;

/// getEncodedElementAccess - Encode the elements accessed into an llvm
/// aggregate Constant of ConstantInt(s).
void getEncodedElementAccess(SmallVectorImpl<uint32_t> &Elts) const;

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getBase()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return AccessorLoc; }

/// isArrow - Return true if the base expression is a pointer to vector,
/// return false if the base expression is a vector.
bool isArrow() const;

static bool classof(const Stmt *T) {
  return T->getStmtClass() == ExtVectorElementExprClass;
}

// Iterators
child_range children() { return child_range(&Base, &Base+1); }
const_child_range children() const {
  return const_child_range(&Base, &Base + 1);
}
5547};

5549/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
5550/// ^{ statement-body }   or   ^(int arg1, float arg2){ statement-body }
5551class BlockExpr : public Expr {
5552protected:
BlockDecl *TheBlock;
5554public:
BlockExpr(BlockDecl *BD, QualType ty)
  : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary,
         ty->isDependentType(), ty->isDependentType(),
         ty->isInstantiationDependentType() || BD->isDependentContext(),
         false),
    TheBlock(BD) {}

/// Build an empty block expression.
explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { }

const BlockDecl *getBlockDecl() const { return TheBlock; }
BlockDecl *getBlockDecl() { return TheBlock; }
void setBlockDecl(BlockDecl *BD) { TheBlock = BD; }

// Convenience functions for probing the underlying BlockDecl.
SourceLocation getCaretLocation() const;
const Stmt *getBody() const;
Stmt *getBody();

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getCaretLocation();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getBody()->getEndLoc();
}

/// getFunctionType - Return the underlying function type for this block.
const FunctionProtoType *getFunctionType() const;

static bool classof(const Stmt *T) {
  return T->getStmtClass() == BlockExprClass;
}

// Iterators
child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}
5595};

5597/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2]
5598/// This AST node provides support for reinterpreting a type to another
5599/// type of the same size.
5600class AsTypeExpr : public Expr {
5601private:
Stmt *SrcExpr;
SourceLocation BuiltinLoc, RParenLoc;

friend class ASTReader;
friend class ASTStmtReader;
explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {}

5609public:
AsTypeExpr(Expr* SrcExpr, QualType DstType,
           ExprValueKind VK, ExprObjectKind OK,
           SourceLocation BuiltinLoc, SourceLocation RParenLoc)
  : Expr(AsTypeExprClass, DstType, VK, OK,
         DstType->isDependentType(),
         DstType->isDependentType() || SrcExpr->isValueDependent(),
         (DstType->isInstantiationDependentType() ||
          SrcExpr->isInstantiationDependent()),
         (DstType->containsUnexpandedParameterPack() ||
          SrcExpr->containsUnexpandedParameterPack())),
SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {}

/// getSrcExpr - Return the Expr to be converted.
Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }

/// getBuiltinLoc - Return the location of the __builtin_astype token.
SourceLocation getBuiltinLoc() const { return BuiltinLoc; }

/// getRParenLoc - Return the location of final right parenthesis.
SourceLocation getRParenLoc() const { return RParenLoc; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == AsTypeExprClass;
}

// Iterators
child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
const_child_range children() const {
  return const_child_range(&SrcExpr, &SrcExpr + 1);
}
5643};

5645/// PseudoObjectExpr - An expression which accesses a pseudo-object
5646/// l-value.  A pseudo-object is an abstract object, accesses to which
5647/// are translated to calls.  The pseudo-object expression has a
5648/// syntactic form, which shows how the expression was actually
5649/// written in the source code, and a semantic form, which is a series
5650/// of expressions to be executed in order which detail how the
5651/// operation is actually evaluated.  Optionally, one of the semantic
5652/// forms may also provide a result value for the expression.
5653///
5654/// If any of the semantic-form expressions is an OpaqueValueExpr,
5655/// that OVE is required to have a source expression, and it is bound
5656/// to the result of that source expression.  Such OVEs may appear
5657/// only in subsequent semantic-form expressions and as
5658/// sub-expressions of the syntactic form.
5659///
5660/// PseudoObjectExpr should be used only when an operation can be
5661/// usefully described in terms of fairly simple rewrite rules on
5662/// objects and functions that are meant to be used by end-developers.
5663/// For example, under the Itanium ABI, dynamic casts are implemented
5664/// as a call to a runtime function called __dynamic_cast; using this
5665/// class to describe that would be inappropriate because that call is
5666/// not really part of the user-visible semantics, and instead the
5667/// cast is properly reflected in the AST and IR-generation has been
5668/// taught to generate the call as necessary.  In contrast, an
5669/// Objective-C property access is semantically defined to be
5670/// equivalent to a particular message send, and this is very much
5671/// part of the user model.  The name of this class encourages this
5672/// modelling design.
5673class PseudoObjectExpr final
  : public Expr,
    private llvm::TrailingObjects<PseudoObjectExpr, Expr *> {
// PseudoObjectExprBits.NumSubExprs - The number of sub-expressions.
// Always at least two, because the first sub-expression is the
// syntactic form.

// PseudoObjectExprBits.ResultIndex - The index of the
// sub-expression holding the result.  0 means the result is void,
// which is unambiguous because it's the index of the syntactic
// form.  Note that this is therefore 1 higher than the value passed
// in to Create, which is an index within the semantic forms.
// Note also that ASTStmtWriter assumes this encoding.

Expr **getSubExprsBuffer() { return getTrailingObjects<Expr *>(); }
const Expr * const *getSubExprsBuffer() const {
  return getTrailingObjects<Expr *>();
}

PseudoObjectExpr(QualType type, ExprValueKind VK,
                 Expr *syntactic, ArrayRef<Expr*> semantic,
                 unsigned resultIndex);

PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs);

unsigned getNumSubExprs() const {
  return PseudoObjectExprBits.NumSubExprs;
}

5702public:
/// NoResult - A value for the result index indicating that there is
/// no semantic result.
enum : unsigned { NoResult = ~0U };

static PseudoObjectExpr *Create(const ASTContext &Context, Expr *syntactic,
                                ArrayRef<Expr*> semantic,
                                unsigned resultIndex);

static PseudoObjectExpr *Create(const ASTContext &Context, EmptyShell shell,
                                unsigned numSemanticExprs);

/// Return the syntactic form of this expression, i.e. the
/// expression it actually looks like.  Likely to be expressed in
/// terms of OpaqueValueExprs bound in the semantic form.
Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; }
const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; }

/// Return the index of the result-bearing expression into the semantics
/// expressions, or PseudoObjectExpr::NoResult if there is none.
unsigned getResultExprIndex() const {
  if (PseudoObjectExprBits.ResultIndex == 0) return NoResult;
  return PseudoObjectExprBits.ResultIndex - 1;
}

/// Return the result-bearing expression, or null if there is none.
Expr *getResultExpr() {
  if (PseudoObjectExprBits.ResultIndex == 0)
    return nullptr;
  return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex];
}
const Expr *getResultExpr() const {
  return const_cast<PseudoObjectExpr*>(this)->getResultExpr();
}

unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; }

typedef Expr * const *semantics_iterator;
typedef const Expr * const *const_semantics_iterator;
semantics_iterator semantics_begin() {
  return getSubExprsBuffer() + 1;
}
const_semantics_iterator semantics_begin() const {
  return getSubExprsBuffer() + 1;
}
semantics_iterator semantics_end() {
  return getSubExprsBuffer() + getNumSubExprs();
}
const_semantics_iterator semantics_end() const {
  return getSubExprsBuffer() + getNumSubExprs();
}

llvm::iterator_range<semantics_iterator> semantics() {
  return llvm::make_range(semantics_begin(), semantics_end());
}
llvm::iterator_range<const_semantics_iterator> semantics() const {
  return llvm::make_range(semantics_begin(), semantics_end());
}

Expr *getSemanticExpr(unsigned index) {
  assert(index + 1 < getNumSubExprs())((index + 1 < getNumSubExprs()) ? static_cast<void> (
0) : __assert_fail ("index + 1 < getNumSubExprs()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5762, __PRETTY_FUNCTION__));
  return getSubExprsBuffer()[index + 1];
}
const Expr *getSemanticExpr(unsigned index) const {
  return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index);
}

SourceLocation getExprLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSyntacticForm()->getExprLoc();
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSyntacticForm()->getBeginLoc();
}
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getSyntacticForm()->getEndLoc();
}

child_range children() {
  const_child_range CCR =
      const_cast<const PseudoObjectExpr *>(this)->children();
  return child_range(cast_away_const(CCR.begin()),
                     cast_away_const(CCR.end()));
}
const_child_range children() const {
  Stmt *const *cs = const_cast<Stmt *const *>(
      reinterpret_cast<const Stmt *const *>(getSubExprsBuffer()));
  return const_child_range(cs, cs + getNumSubExprs());
}

static bool classof(const Stmt *T) {
  return T->getStmtClass() == PseudoObjectExprClass;
}

friend TrailingObjects;
friend class ASTStmtReader;
5798};

5800/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*,
5801/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the
5802/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>,
5803/// and corresponding __opencl_atomic_* for OpenCL 2.0.
5804/// All of these instructions take one primary pointer, at least one memory
5805/// order. The instructions for which getScopeModel returns non-null value
5806/// take one synch scope.
5807class AtomicExpr : public Expr {
5808public:
enum AtomicOp {
5810#define BUILTIN(ID, TYPE, ATTRS)
5811#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID,
5812#include "clang/Basic/Builtins.def"
  // Avoid trailing comma
  BI_First = 0
};

5817private:
/// Location of sub-expressions.
/// The location of Scope sub-expression is NumSubExprs - 1, which is
/// not fixed, therefore is not defined in enum.
enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR };
Stmt *SubExprs[END_EXPR + 1];
unsigned NumSubExprs;
SourceLocation BuiltinLoc, RParenLoc;
AtomicOp Op;

friend class ASTStmtReader;
5828public:
AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t,
           AtomicOp op, SourceLocation RP);

/// Determine the number of arguments the specified atomic builtin
/// should have.
static unsigned getNumSubExprs(AtomicOp Op);

/// Build an empty AtomicExpr.
explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { }

Expr *getPtr() const {
  return cast<Expr>(SubExprs[PTR]);
}
Expr *getOrder() const {
  return cast<Expr>(SubExprs[ORDER]);
}
Expr *getScope() const {
  assert(getScopeModel() && "No scope")((getScopeModel() && "No scope") ? static_cast<void
> (0) : __assert_fail ("getScopeModel() && \"No scope\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5846, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[NumSubExprs - 1]);
}
Expr *getVal1() const {
  if (Op == AO__c11_atomic_init || Op == AO__opencl_atomic_init)
    return cast<Expr>(SubExprs[ORDER]);
  assert(NumSubExprs > VAL1)((NumSubExprs > VAL1) ? static_cast<void> (0) : __assert_fail
 ("NumSubExprs > VAL1", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5852, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[VAL1]);
}
Expr *getOrderFail() const {
  assert(NumSubExprs > ORDER_FAIL)((NumSubExprs > ORDER_FAIL) ? static_cast<void> (0) :
 __assert_fail ("NumSubExprs > ORDER_FAIL", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5856, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[ORDER_FAIL]);
}
Expr *getVal2() const {
  if (Op == AO__atomic_exchange)
    return cast<Expr>(SubExprs[ORDER_FAIL]);
  assert(NumSubExprs > VAL2)((NumSubExprs > VAL2) ? static_cast<void> (0) : __assert_fail
 ("NumSubExprs > VAL2", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5862, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[VAL2]);
}
Expr *getWeak() const {
  assert(NumSubExprs > WEAK)((NumSubExprs > WEAK) ? static_cast<void> (0) : __assert_fail
 ("NumSubExprs > WEAK", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5866, __PRETTY_FUNCTION__));
  return cast<Expr>(SubExprs[WEAK]);
}
QualType getValueType() const;

AtomicOp getOp() const { return Op; }
unsigned getNumSubExprs() const { return NumSubExprs; }

Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
const Expr * const *getSubExprs() const {
  return reinterpret_cast<Expr * const *>(SubExprs);
}

bool isVolatile() const {
  return getPtr()->getType()->getPointeeType().isVolatileQualified();
}

bool isCmpXChg() const {
  return getOp() == AO__c11_atomic_compare_exchange_strong ||
         getOp() == AO__c11_atomic_compare_exchange_weak ||
         getOp() == AO__opencl_atomic_compare_exchange_strong ||
         getOp() == AO__opencl_atomic_compare_exchange_weak ||
         getOp() == AO__atomic_compare_exchange ||
         getOp() == AO__atomic_compare_exchange_n;
}

bool isOpenCL() const {
  return getOp() >= AO__opencl_atomic_init &&
         getOp() <= AO__opencl_atomic_fetch_max;
}

SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
SourceLocation getRParenLoc() const { return RParenLoc; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return BuiltinLoc; }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return RParenLoc; }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == AtomicExprClass;
}

// Iterators
child_range children() {
  return child_range(SubExprs, SubExprs+NumSubExprs);
}
const_child_range children() const {
  return const_child_range(SubExprs, SubExprs + NumSubExprs);
}

/// Get atomic scope model for the atomic op code.
/// \return empty atomic scope model if the atomic op code does not have
///   scope operand.
static std::unique_ptr<AtomicScopeModel> getScopeModel(AtomicOp Op) {
  auto Kind =
      (Op >= AO__opencl_atomic_load && Op <= AO__opencl_atomic_fetch_max)
          ? AtomicScopeModelKind::OpenCL
          : AtomicScopeModelKind::None;
  return AtomicScopeModel::create(Kind);
}

/// Get atomic scope model.
/// \return empty atomic scope model if this atomic expression does not have
///   scope operand.
std::unique_ptr<AtomicScopeModel> getScopeModel() const {
  return getScopeModel(getOp());
}
5932};

5934/// TypoExpr - Internal placeholder for expressions where typo correction
5935/// still needs to be performed and/or an error diagnostic emitted.
5936class TypoExpr : public Expr {
5937public:
TypoExpr(QualType T)
    : Expr(TypoExprClass, T, VK_LValue, OK_Ordinary,
           /*isTypeDependent*/ true,
           /*isValueDependent*/ true,
           /*isInstantiationDependent*/ true,
           /*containsUnexpandedParameterPack*/ false) {
  assert(T->isDependentType() && "TypoExpr given a non-dependent type")((T->isDependentType() && "TypoExpr given a non-dependent type"
) ? static_cast<void> (0) : __assert_fail ("T->isDependentType() && \"TypoExpr given a non-dependent type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Expr.h"
, 5944, __PRETTY_FUNCTION__));
}

child_range children() {
  return child_range(child_iterator(), child_iterator());
}
const_child_range children() const {
  return const_child_range(const_child_iterator(), const_child_iterator());
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }
SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { return SourceLocation(); }

static bool classof(const Stmt *T) {
  return T->getStmtClass() == TypoExprClass;
}

5961};
5962} // end namespace clang

5964#endif // LLVM_CLANG_AST_EXPR_H

←

/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h

1//===- Type.h - C Language Family Type Representation -----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// C Language Family Type Representation
11///
12/// This file defines the clang::Type interface and subclasses, used to
13/// represent types for languages in the C family.
14//
15//===----------------------------------------------------------------------===//

17#ifndef LLVM_CLANG_AST_TYPE_H
18#define LLVM_CLANG_AST_TYPE_H

20#include "clang/AST/NestedNameSpecifier.h"
21#include "clang/AST/TemplateName.h"
22#include "clang/Basic/AddressSpaces.h"
23#include "clang/Basic/AttrKinds.h"
24#include "clang/Basic/Diagnostic.h"
25#include "clang/Basic/ExceptionSpecificationType.h"
26#include "clang/Basic/LLVM.h"
27#include "clang/Basic/Linkage.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/SourceLocation.h"
30#include "clang/Basic/Specifiers.h"
31#include "clang/Basic/Visibility.h"
32#include "llvm/ADT/APInt.h"
33#include "llvm/ADT/APSInt.h"
34#include "llvm/ADT/ArrayRef.h"
35#include "llvm/ADT/FoldingSet.h"
36#include "llvm/ADT/None.h"
37#include "llvm/ADT/Optional.h"
38#include "llvm/ADT/PointerIntPair.h"
39#include "llvm/ADT/PointerUnion.h"
40#include "llvm/ADT/StringRef.h"
41#include "llvm/ADT/Twine.h"
42#include "llvm/ADT/iterator_range.h"
43#include "llvm/Support/Casting.h"
44#include "llvm/Support/Compiler.h"
45#include "llvm/Support/ErrorHandling.h"
46#include "llvm/Support/PointerLikeTypeTraits.h"
47#include "llvm/Support/type_traits.h"
48#include "llvm/Support/TrailingObjects.h"
49#include <cassert>
50#include <cstddef>
51#include <cstdint>
52#include <cstring>
53#include <string>
54#include <type_traits>
55#include <utility>

57namespace clang {

59class ExtQuals;
60class QualType;
61class TagDecl;
62class Type;

64enum {
TypeAlignmentInBits = 4,
TypeAlignment = 1 << TypeAlignmentInBits
67};

69} // namespace clang

71namespace llvm {

template <typename T>
struct PointerLikeTypeTraits;
template<>
struct PointerLikeTypeTraits< ::clang::Type*> {
  static inline void *getAsVoidPointer(::clang::Type *P) { return P; }

  static inline ::clang::Type *getFromVoidPointer(void *P) {
    return static_cast< ::clang::Type*>(P);
  }

  enum { NumLowBitsAvailable = clang::TypeAlignmentInBits };
};

template<>
struct PointerLikeTypeTraits< ::clang::ExtQuals*> {
  static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; }

  static inline ::clang::ExtQuals *getFromVoidPointer(void *P) {
    return static_cast< ::clang::ExtQuals*>(P);
  }

  enum { NumLowBitsAvailable = clang::TypeAlignmentInBits };
};

97} // namespace llvm

99namespace clang {

101class ASTContext;
102template <typename> class CanQual;
103class CXXRecordDecl;
104class DeclContext;
105class EnumDecl;
106class Expr;
107class ExtQualsTypeCommonBase;
108class FunctionDecl;
109class IdentifierInfo;
110class NamedDecl;
111class ObjCInterfaceDecl;
112class ObjCProtocolDecl;
113class ObjCTypeParamDecl;
114struct PrintingPolicy;
115class RecordDecl;
116class Stmt;
117class TagDecl;
118class TemplateArgument;
119class TemplateArgumentListInfo;
120class TemplateArgumentLoc;
121class TemplateTypeParmDecl;
122class TypedefNameDecl;
123class UnresolvedUsingTypenameDecl;

125using CanQualType = CanQual<Type>;

127// Provide forward declarations for all of the *Type classes.
128#define TYPE(Class, Base) class Class##Type;
129#include "clang/AST/TypeNodes.inc"

131/// The collection of all-type qualifiers we support.
132/// Clang supports five independent qualifiers:
133/// * C99: const, volatile, and restrict
134/// * MS: __unaligned
135/// * Embedded C (TR18037): address spaces
136/// * Objective C: the GC attributes (none, weak, or strong)
137class Qualifiers {
138public:
enum TQ { // NOTE: These flags must be kept in sync with DeclSpec::TQ.
  Const    = 0x1,
  Restrict = 0x2,
  Volatile = 0x4,
  CVRMask = Const | Volatile | Restrict
};

enum GC {
  GCNone = 0,
  Weak,
  Strong
};

enum ObjCLifetime {
  /// There is no lifetime qualification on this type.
  OCL_None,

  /// This object can be modified without requiring retains or
  /// releases.
  OCL_ExplicitNone,

  /// Assigning into this object requires the old value to be
  /// released and the new value to be retained.  The timing of the
  /// release of the old value is inexact: it may be moved to
  /// immediately after the last known point where the value is
  /// live.
  OCL_Strong,

  /// Reading or writing from this object requires a barrier call.
  OCL_Weak,

  /// Assigning into this object requires a lifetime extension.
  OCL_Autoreleasing
};

enum {
  /// The maximum supported address space number.
  /// 23 bits should be enough for anyone.
  MaxAddressSpace = 0x7fffffu,

  /// The width of the "fast" qualifier mask.
  FastWidth = 3,

  /// The fast qualifier mask.
  FastMask = (1 << FastWidth) - 1
};

/// Returns the common set of qualifiers while removing them from
/// the given sets.
static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R) {
  // If both are only CVR-qualified, bit operations are sufficient.
  if (!(L.Mask & ~CVRMask) && !(R.Mask & ~CVRMask)) {
    Qualifiers Q;
    Q.Mask = L.Mask & R.Mask;
    L.Mask &= ~Q.Mask;
    R.Mask &= ~Q.Mask;
    return Q;
  }

  Qualifiers Q;
  unsigned CommonCRV = L.getCVRQualifiers() & R.getCVRQualifiers();
  Q.addCVRQualifiers(CommonCRV);
  L.removeCVRQualifiers(CommonCRV);
  R.removeCVRQualifiers(CommonCRV);

  if (L.getObjCGCAttr() == R.getObjCGCAttr()) {
    Q.setObjCGCAttr(L.getObjCGCAttr());
    L.removeObjCGCAttr();
    R.removeObjCGCAttr();
  }

  if (L.getObjCLifetime() == R.getObjCLifetime()) {
    Q.setObjCLifetime(L.getObjCLifetime());
    L.removeObjCLifetime();
    R.removeObjCLifetime();
  }

  if (L.getAddressSpace() == R.getAddressSpace()) {
    Q.setAddressSpace(L.getAddressSpace());
    L.removeAddressSpace();
    R.removeAddressSpace();
  }
  return Q;
}

static Qualifiers fromFastMask(unsigned Mask) {
  Qualifiers Qs;
  Qs.addFastQualifiers(Mask);
  return Qs;
}

static Qualifiers fromCVRMask(unsigned CVR) {
  Qualifiers Qs;
  Qs.addCVRQualifiers(CVR);
  return Qs;
}

static Qualifiers fromCVRUMask(unsigned CVRU) {
  Qualifiers Qs;
  Qs.addCVRUQualifiers(CVRU);
  return Qs;
}

// Deserialize qualifiers from an opaque representation.
static Qualifiers fromOpaqueValue(unsigned opaque) {
  Qualifiers Qs;
  Qs.Mask = opaque;
  return Qs;
}

// Serialize these qualifiers into an opaque representation.
unsigned getAsOpaqueValue() const {
  return Mask;
}

bool hasConst() const { return Mask & Const; }
bool hasOnlyConst() const { return Mask == Const; }
void removeConst() { Mask &= ~Const; }
void addConst() { Mask |= Const; }

bool hasVolatile() const { return Mask & Volatile; }
bool hasOnlyVolatile() const { return Mask == Volatile; }
void removeVolatile() { Mask &= ~Volatile; }
void addVolatile() { Mask |= Volatile; }

bool hasRestrict() const { return Mask & Restrict; }
bool hasOnlyRestrict() const { return Mask == Restrict; }
void removeRestrict() { Mask &= ~Restrict; }
void addRestrict() { Mask |= Restrict; }

bool hasCVRQualifiers() const { return getCVRQualifiers(); }
unsigned getCVRQualifiers() const { return Mask & CVRMask; }
unsigned getCVRUQualifiers() const { return Mask & (CVRMask | UMask); }

void setCVRQualifiers(unsigned mask) {
  assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 274, __PRETTY_FUNCTION__));
  Mask = (Mask & ~CVRMask) | mask;
}
void removeCVRQualifiers(unsigned mask) {
  assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 278, __PRETTY_FUNCTION__));
  Mask &= ~mask;
}
void removeCVRQualifiers() {
  removeCVRQualifiers(CVRMask);
}
void addCVRQualifiers(unsigned mask) {
  assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 285, __PRETTY_FUNCTION__));
  Mask |= mask;
}
void addCVRUQualifiers(unsigned mask) {
  assert(!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits")((!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask & ~UMask) && \"bitmask contains non-CVRU bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 289, __PRETTY_FUNCTION__));
  Mask |= mask;
}

bool hasUnaligned() const { return Mask & UMask; }
void setUnaligned(bool flag) {
  Mask = (Mask & ~UMask) | (flag ? UMask : 0);
}
void removeUnaligned() { Mask &= ~UMask; }
void addUnaligned() { Mask |= UMask; }

bool hasObjCGCAttr() const { return Mask & GCAttrMask; }
GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); }
void setObjCGCAttr(GC type) {
  Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift);
}
void removeObjCGCAttr() { setObjCGCAttr(GCNone); }
void addObjCGCAttr(GC type) {
  assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 307, __PRETTY_FUNCTION__));
  setObjCGCAttr(type);
}
Qualifiers withoutObjCGCAttr() const {
  Qualifiers qs = *this;
  qs.removeObjCGCAttr();
  return qs;
}
Qualifiers withoutObjCLifetime() const {
  Qualifiers qs = *this;
  qs.removeObjCLifetime();
  return qs;
}
Qualifiers withoutAddressSpace() const {
  Qualifiers qs = *this;
  qs.removeAddressSpace();
  return qs;
}

bool hasObjCLifetime() const { return Mask & LifetimeMask; }
ObjCLifetime getObjCLifetime() const {
  return ObjCLifetime((Mask & LifetimeMask) >> LifetimeShift);
}
void setObjCLifetime(ObjCLifetime type) {
  Mask = (Mask & ~LifetimeMask) | (type << LifetimeShift);
}
void removeObjCLifetime() { setObjCLifetime(OCL_None); }
void addObjCLifetime(ObjCLifetime type) {
  assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 335, __PRETTY_FUNCTION__));
  assert(!hasObjCLifetime())((!hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
 ("!hasObjCLifetime()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 336, __PRETTY_FUNCTION__));
  Mask |= (type << LifetimeShift);
}

/// True if the lifetime is neither None or ExplicitNone.
bool hasNonTrivialObjCLifetime() const {
  ObjCLifetime lifetime = getObjCLifetime();
  return (lifetime > OCL_ExplicitNone);
}

/// True if the lifetime is either strong or weak.
bool hasStrongOrWeakObjCLifetime() const {
  ObjCLifetime lifetime = getObjCLifetime();
  return (lifetime == OCL_Strong || lifetime == OCL_Weak);
}

bool hasAddressSpace() const { return Mask & AddressSpaceMask; }
LangAS getAddressSpace() const {
  return static_cast<LangAS>(Mask >> AddressSpaceShift);
}
bool hasTargetSpecificAddressSpace() const {
  return isTargetAddressSpace(getAddressSpace());
}
/// Get the address space attribute value to be printed by diagnostics.
unsigned getAddressSpaceAttributePrintValue() const {
  auto Addr = getAddressSpace();
  // This function is not supposed to be used with language specific
  // address spaces. If that happens, the diagnostic message should consider
  // printing the QualType instead of the address space value.
  assert(Addr == LangAS::Default || hasTargetSpecificAddressSpace())((Addr == LangAS::Default || hasTargetSpecificAddressSpace())
 ? static_cast<void> (0) : __assert_fail ("Addr == LangAS::Default || hasTargetSpecificAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 365, __PRETTY_FUNCTION__));
  if (Addr != LangAS::Default)
    return toTargetAddressSpace(Addr);
  // TODO: The diagnostic messages where Addr may be 0 should be fixed
  // since it cannot differentiate the situation where 0 denotes the default
  // address space or user specified __attribute__((address_space(0))).
  return 0;
}
void setAddressSpace(LangAS space) {
  assert((unsigned)space <= MaxAddressSpace)(((unsigned)space <= MaxAddressSpace) ? static_cast<void
> (0) : __assert_fail ("(unsigned)space <= MaxAddressSpace"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 374, __PRETTY_FUNCTION__));
  Mask = (Mask & ~AddressSpaceMask)
       | (((uint32_t) space) << AddressSpaceShift);
}
void removeAddressSpace() { setAddressSpace(LangAS::Default); }
void addAddressSpace(LangAS space) {
  assert(space != LangAS::Default)((space != LangAS::Default) ? static_cast<void> (0) : __assert_fail
 ("space != LangAS::Default", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 380, __PRETTY_FUNCTION__));
  setAddressSpace(space);
}

// Fast qualifiers are those that can be allocated directly
// on a QualType object.
bool hasFastQualifiers() const { return getFastQualifiers(); }
unsigned getFastQualifiers() const { return Mask & FastMask; }
void setFastQualifiers(unsigned mask) {
  assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 389, __PRETTY_FUNCTION__));
  Mask = (Mask & ~FastMask) | mask;
}
void removeFastQualifiers(unsigned mask) {
  assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 393, __PRETTY_FUNCTION__));
  Mask &= ~mask;
}
void removeFastQualifiers() {
  removeFastQualifiers(FastMask);
}
void addFastQualifiers(unsigned mask) {
  assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 400, __PRETTY_FUNCTION__));
  Mask |= mask;
}

/// Return true if the set contains any qualifiers which require an ExtQuals
/// node to be allocated.
bool hasNonFastQualifiers() const { return Mask & ~FastMask; }
Qualifiers getNonFastQualifiers() const {
  Qualifiers Quals = *this;
  Quals.setFastQualifiers(0);
  return Quals;
}

/// Return true if the set contains any qualifiers.
bool hasQualifiers() const { return Mask; }
bool empty() const { return !Mask; }

/// Add the qualifiers from the given set to this set.
void addQualifiers(Qualifiers Q) {
  // If the other set doesn't have any non-boolean qualifiers, just
  // bit-or it in.
  if (!(Q.Mask & ~CVRMask))
    Mask |= Q.Mask;
  else {
    Mask |= (Q.Mask & CVRMask);
    if (Q.hasAddressSpace())
      addAddressSpace(Q.getAddressSpace());
    if (Q.hasObjCGCAttr())
      addObjCGCAttr(Q.getObjCGCAttr());
    if (Q.hasObjCLifetime())
      addObjCLifetime(Q.getObjCLifetime());
  }
}

/// Remove the qualifiers from the given set from this set.
void removeQualifiers(Qualifiers Q) {
  // If the other set doesn't have any non-boolean qualifiers, just
  // bit-and the inverse in.
  if (!(Q.Mask & ~CVRMask))
    Mask &= ~Q.Mask;
  else {
    Mask &= ~(Q.Mask & CVRMask);
    if (getObjCGCAttr() == Q.getObjCGCAttr())
      removeObjCGCAttr();
    if (getObjCLifetime() == Q.getObjCLifetime())
      removeObjCLifetime();
    if (getAddressSpace() == Q.getAddressSpace())
      removeAddressSpace();
  }
}

/// Add the qualifiers from the given set to this set, given that
/// they don't conflict.
void addConsistentQualifiers(Qualifiers qs) {
  assert(getAddressSpace() == qs.getAddressSpace() ||((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
 ("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 455, __PRETTY_FUNCTION__))
         !hasAddressSpace() || !qs.hasAddressSpace())((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
 ("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 455, __PRETTY_FUNCTION__));
  assert(getObjCGCAttr() == qs.getObjCGCAttr() ||((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
 !qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
 ("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 457, __PRETTY_FUNCTION__))
         !hasObjCGCAttr() || !qs.hasObjCGCAttr())((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
 !qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
 ("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 457, __PRETTY_FUNCTION__));
  assert(getObjCLifetime() == qs.getObjCLifetime() ||((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
 ("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 459, __PRETTY_FUNCTION__))
         !hasObjCLifetime() || !qs.hasObjCLifetime())((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
 ("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 459, __PRETTY_FUNCTION__));
  Mask |= qs.Mask;
}

/// Returns true if address space A is equal to or a superset of B.
/// OpenCL v2.0 defines conversion rules (OpenCLC v2.0 s6.5.5) and notion of
/// overlapping address spaces.
/// CL1.1 or CL1.2:
///   every address space is a superset of itself.
/// CL2.0 adds:
///   __generic is a superset of any address space except for __constant.
static bool isAddressSpaceSupersetOf(LangAS A, LangAS B) {
  // Address spaces must match exactly.
  return A == B ||
         // Otherwise in OpenCLC v2.0 s6.5.5: every address space except
         // for __constant can be used as __generic.
         (A == LangAS::opencl_generic && B != LangAS::opencl_constant);
}

/// Returns true if the address space in these qualifiers is equal to or
/// a superset of the address space in the argument qualifiers.
bool isAddressSpaceSupersetOf(Qualifiers other) const {
  return isAddressSpaceSupersetOf(getAddressSpace(), other.getAddressSpace());
}

/// Determines if these qualifiers compatibly include another set.
/// Generally this answers the question of whether an object with the other
/// qualifiers can be safely used as an object with these qualifiers.
bool compatiblyIncludes(Qualifiers other) const {
  return isAddressSpaceSupersetOf(other) &&
         // ObjC GC qualifiers can match, be added, or be removed, but can't
         // be changed.
         (getObjCGCAttr() == other.getObjCGCAttr() || !hasObjCGCAttr() ||
          !other.hasObjCGCAttr()) &&
         // ObjC lifetime qualifiers must match exactly.
         getObjCLifetime() == other.getObjCLifetime() &&
         // CVR qualifiers may subset.
         (((Mask & CVRMask) | (other.Mask & CVRMask)) == (Mask & CVRMask)) &&
         // U qualifier may superset.
         (!other.hasUnaligned() || hasUnaligned());
}

/// Determines if these qualifiers compatibly include another set of
/// qualifiers from the narrow perspective of Objective-C ARC lifetime.
///
/// One set of Objective-C lifetime qualifiers compatibly includes the other
/// if the lifetime qualifiers match, or if both are non-__weak and the
/// including set also contains the 'const' qualifier, or both are non-__weak
/// and one is None (which can only happen in non-ARC modes).
bool compatiblyIncludesObjCLifetime(Qualifiers other) const {
  if (getObjCLifetime() == other.getObjCLifetime())
    return true;

  if (getObjCLifetime() == OCL_Weak || other.getObjCLifetime() == OCL_Weak)
    return false;

  if (getObjCLifetime() == OCL_None || other.getObjCLifetime() == OCL_None)
    return true;

  return hasConst();
}

/// Determine whether this set of qualifiers is a strict superset of
/// another set of qualifiers, not considering qualifier compatibility.
bool isStrictSupersetOf(Qualifiers Other) const;

bool operator==(Qualifiers Other) const { return Mask == Other.Mask; }
bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; }

explicit operator bool() const { return hasQualifiers(); }

Qualifiers &operator+=(Qualifiers R) {
  addQualifiers(R);
  return *this;
}

// Union two qualifier sets.  If an enumerated qualifier appears
// in both sets, use the one from the right.
friend Qualifiers operator+(Qualifiers L, Qualifiers R) {
  L += R;
  return L;
}

Qualifiers &operator-=(Qualifiers R) {
  removeQualifiers(R);
  return *this;
}

/// Compute the difference between two qualifier sets.
friend Qualifiers operator-(Qualifiers L, Qualifiers R) {
  L -= R;
  return L;
}

std::string getAsString() const;
std::string getAsString(const PrintingPolicy &Policy) const;

bool isEmptyWhenPrinted(const PrintingPolicy &Policy) const;
void print(raw_ostream &OS, const PrintingPolicy &Policy,
           bool appendSpaceIfNonEmpty = false) const;

void Profile(llvm::FoldingSetNodeID &ID) const {
  ID.AddInteger(Mask);
}

564private:
// bits:     |0 1 2|3|4 .. 5|6  ..  8|9   ...   31|
//           |C R V|U|GCAttr|Lifetime|AddressSpace|
uint32_t Mask = 0;

static const uint32_t UMask = 0x8;
static const uint32_t UShift = 3;
static const uint32_t GCAttrMask = 0x30;
static const uint32_t GCAttrShift = 4;
static const uint32_t LifetimeMask = 0x1C0;
static const uint32_t LifetimeShift = 6;
static const uint32_t AddressSpaceMask =
    ~(CVRMask | UMask | GCAttrMask | LifetimeMask);
static const uint32_t AddressSpaceShift = 9;
578};

580/// A std::pair-like structure for storing a qualified type split
581/// into its local qualifiers and its locally-unqualified type.
582struct SplitQualType {
/// The locally-unqualified type.
const Type *Ty = nullptr;

/// The local qualifiers.
Qualifiers Quals;

SplitQualType() = default;
SplitQualType(const Type *ty, Qualifiers qs) : Ty(ty), Quals(qs) {}

SplitQualType getSingleStepDesugaredType() const; // end of this file

// Make std::tie work.
std::pair<const Type *,Qualifiers> asPair() const {
  return std::pair<const Type *, Qualifiers>(Ty, Quals);
}

friend bool operator==(SplitQualType a, SplitQualType b) {
  return a.Ty == b.Ty && a.Quals == b.Quals;
}
friend bool operator!=(SplitQualType a, SplitQualType b) {
  return a.Ty != b.Ty || a.Quals != b.Quals;
}
605};

607/// The kind of type we are substituting Objective-C type arguments into.
608///
609/// The kind of substitution affects the replacement of type parameters when
610/// no concrete type information is provided, e.g., when dealing with an
611/// unspecialized type.
612enum class ObjCSubstitutionContext {
/// An ordinary type.
Ordinary,

/// The result type of a method or function.
Result,

/// The parameter type of a method or function.
Parameter,

/// The type of a property.
Property,

/// The superclass of a type.
Superclass,
627};

629/// A (possibly-)qualified type.
630///
631/// For efficiency, we don't store CV-qualified types as nodes on their
632/// own: instead each reference to a type stores the qualifiers.  This
633/// greatly reduces the number of nodes we need to allocate for types (for
634/// example we only need one for 'int', 'const int', 'volatile int',
635/// 'const volatile int', etc).
636///
637/// As an added efficiency bonus, instead of making this a pair, we
638/// just store the two bits we care about in the low bits of the
639/// pointer.  To handle the packing/unpacking, we make QualType be a
640/// simple wrapper class that acts like a smart pointer.  A third bit
641/// indicates whether there are extended qualifiers present, in which
642/// case the pointer points to a special structure.
643class QualType {
friend class QualifierCollector;

// Thankfully, these are efficiently composable.
llvm::PointerIntPair<llvm::PointerUnion<const Type *, const ExtQuals *>,
                     Qualifiers::FastWidth> Value;

const ExtQuals *getExtQualsUnsafe() const {
  return Value.getPointer().get<const ExtQuals*>();
}

const Type *getTypePtrUnsafe() const {
  return Value.getPointer().get<const Type*>();
}

const ExtQualsTypeCommonBase *getCommonPtr() const {
  assert(!isNull() && "Cannot retrieve a NULL type pointer")((!isNull() && "Cannot retrieve a NULL type pointer")
 ? static_cast<void> (0) : __assert_fail ("!isNull() && \"Cannot retrieve a NULL type pointer\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 659, __PRETTY_FUNCTION__));
  auto CommonPtrVal = reinterpret_cast<uintptr_t>(Value.getOpaqueValue());
  CommonPtrVal &= ~(uintptr_t)((1 << TypeAlignmentInBits) - 1);
  return reinterpret_cast<ExtQualsTypeCommonBase*>(CommonPtrVal);
}

665public:
QualType() = default;
QualType(const Type *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
QualType(const ExtQuals *Ptr, unsigned Quals) : Value(Ptr, Quals) {}

unsigned getLocalFastQualifiers() const { return Value.getInt(); }
void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); }

/// Retrieves a pointer to the underlying (unqualified) type.
///
/// This function requires that the type not be NULL. If the type might be
/// NULL, use the (slightly less efficient) \c getTypePtrOrNull().
const Type *getTypePtr() const;

const Type *getTypePtrOrNull() const;

/// Retrieves a pointer to the name of the base type.
const IdentifierInfo *getBaseTypeIdentifier() const;

/// Divides a QualType into its unqualified type and a set of local
/// qualifiers.
SplitQualType split() const;

void *getAsOpaquePtr() const { return Value.getOpaqueValue(); }

static QualType getFromOpaquePtr(const void *Ptr) {
  QualType T;
  T.Value.setFromOpaqueValue(const_cast<void*>(Ptr));
  return T;
}

const Type &operator*() const {
  return *getTypePtr();
}

const Type *operator->() const {
  return getTypePtr();
}

bool isCanonical() const;
bool isCanonicalAsParam() const;

/// Return true if this QualType doesn't point to a type yet.
bool isNull() const {
  return Value.getPointer().isNull();
}

/// Determine whether this particular QualType instance has the
/// "const" qualifier set, without looking through typedefs that may have
/// added "const" at a different level.
bool isLocalConstQualified() const {
  return (getLocalFastQualifiers() & Qualifiers::Const);
}

/// Determine whether this type is const-qualified.
bool isConstQualified() const;

/// Determine whether this particular QualType instance has the
/// "restrict" qualifier set, without looking through typedefs that may have
/// added "restrict" at a different level.
bool isLocalRestrictQualified() const {
  return (getLocalFastQualifiers() & Qualifiers::Restrict);
}

/// Determine whether this type is restrict-qualified.
bool isRestrictQualified() const;

/// Determine whether this particular QualType instance has the
/// "volatile" qualifier set, without looking through typedefs that may have
/// added "volatile" at a different level.
bool isLocalVolatileQualified() const {
  return (getLocalFastQualifiers() & Qualifiers::Volatile);
}

/// Determine whether this type is volatile-qualified.
bool isVolatileQualified() const;

/// Determine whether this particular QualType instance has any
/// qualifiers, without looking through any typedefs that might add
/// qualifiers at a different level.
bool hasLocalQualifiers() const {
  return getLocalFastQualifiers() || hasLocalNonFastQualifiers();
}

/// Determine whether this type has any qualifiers.
bool hasQualifiers() const;

/// Determine whether this particular QualType instance has any
/// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType
/// instance.
bool hasLocalNonFastQualifiers() const {
  return Value.getPointer().is<const ExtQuals*>();
}

/// Retrieve the set of qualifiers local to this particular QualType
/// instance, not including any qualifiers acquired through typedefs or
/// other sugar.
Qualifiers getLocalQualifiers() const;

/// Retrieve the set of qualifiers applied to this type.
Qualifiers getQualifiers() const;

/// Retrieve the set of CVR (const-volatile-restrict) qualifiers
/// local to this particular QualType instance, not including any qualifiers
/// acquired through typedefs or other sugar.
unsigned getLocalCVRQualifiers() const {
  return getLocalFastQualifiers();
}

/// Retrieve the set of CVR (const-volatile-restrict) qualifiers
/// applied to this type.
unsigned getCVRQualifiers() const;

bool isConstant(const ASTContext& Ctx) const {
  return QualType::isConstant(*this, Ctx);
}

/// Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
bool isPODType(const ASTContext &Context) const;

/// Return true if this is a POD type according to the rules of the C++98
/// standard, regardless of the current compilation's language.
bool isCXX98PODType(const ASTContext &Context) const;

/// Return true if this is a POD type according to the more relaxed rules
/// of the C++11 standard, regardless of the current compilation's language.
/// (C++0x [basic.types]p9). Note that, unlike
/// CXXRecordDecl::isCXX11StandardLayout, this takes DRs into account.
bool isCXX11PODType(const ASTContext &Context) const;

/// Return true if this is a trivial type per (C++0x [basic.types]p9)
bool isTrivialType(const ASTContext &Context) const;

/// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
bool isTriviallyCopyableType(const ASTContext &Context) const;


/// Returns true if it is a class and it might be dynamic.
bool mayBeDynamicClass() const;

/// Returns true if it is not a class or if the class might not be dynamic.
bool mayBeNotDynamicClass() const;

// Don't promise in the API that anything besides 'const' can be
// easily added.

/// Add the `const` type qualifier to this QualType.
void addConst() {
  addFastQualifiers(Qualifiers::Const);
}
QualType withConst() const {
  return withFastQualifiers(Qualifiers::Const);
}

/// Add the `volatile` type qualifier to this QualType.
void addVolatile() {
  addFastQualifiers(Qualifiers::Volatile);
}
QualType withVolatile() const {
  return withFastQualifiers(Qualifiers::Volatile);
}

/// Add the `restrict` qualifier to this QualType.
void addRestrict() {
  addFastQualifiers(Qualifiers::Restrict);
}
QualType withRestrict() const {
  return withFastQualifiers(Qualifiers::Restrict);
}

QualType withCVRQualifiers(unsigned CVR) const {
  return withFastQualifiers(CVR);
}

void addFastQualifiers(unsigned TQs) {
  assert(!(TQs & ~Qualifiers::FastMask)((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 841, __PRETTY_FUNCTION__))
         && "non-fast qualifier bits set in mask!")((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 841, __PRETTY_FUNCTION__));
  Value.setInt(Value.getInt() | TQs);
}

void removeLocalConst();
void removeLocalVolatile();
void removeLocalRestrict();
void removeLocalCVRQualifiers(unsigned Mask);

void removeLocalFastQualifiers() { Value.setInt(0); }
void removeLocalFastQualifiers(unsigned Mask) {
  assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers")((!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!(Mask & ~Qualifiers::FastMask) && \"mask has non-fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 852, __PRETTY_FUNCTION__));
  Value.setInt(Value.getInt() & ~Mask);
}

// Creates a type with the given qualifiers in addition to any
// qualifiers already on this type.
QualType withFastQualifiers(unsigned TQs) const {
  QualType T = *this;
  T.addFastQualifiers(TQs);
  return T;
}

// Creates a type with exactly the given fast qualifiers, removing
// any existing fast qualifiers.
QualType withExactLocalFastQualifiers(unsigned TQs) const {
  return withoutLocalFastQualifiers().withFastQualifiers(TQs);
}

// Removes fast qualifiers, but leaves any extended qualifiers in place.
QualType withoutLocalFastQualifiers() const {
  QualType T = *this;
  T.removeLocalFastQualifiers();
  return T;
}

QualType getCanonicalType() const;

/// Return this type with all of the instance-specific qualifiers
/// removed, but without removing any qualifiers that may have been applied
/// through typedefs.
QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); }

/// Retrieve the unqualified variant of the given type,
/// removing as little sugar as possible.
///
/// This routine looks through various kinds of sugar to find the
/// least-desugared type that is unqualified. For example, given:
///
/// \code
/// typedef int Integer;
/// typedef const Integer CInteger;
/// typedef CInteger DifferenceType;
/// \endcode
///
/// Executing \c getUnqualifiedType() on the type \c DifferenceType will
/// desugar until we hit the type \c Integer, which has no qualifiers on it.
///
/// The resulting type might still be qualified if it's sugar for an array
/// type.  To strip qualifiers even from within a sugared array type, use
/// ASTContext::getUnqualifiedArrayType.
inline QualType getUnqualifiedType() const;

/// Retrieve the unqualified variant of the given type, removing as little
/// sugar as possible.
///
/// Like getUnqualifiedType(), but also returns the set of
/// qualifiers that were built up.
///
/// The resulting type might still be qualified if it's sugar for an array
/// type.  To strip qualifiers even from within a sugared array type, use
/// ASTContext::getUnqualifiedArrayType.
inline SplitQualType getSplitUnqualifiedType() const;

/// Determine whether this type is more qualified than the other
/// given type, requiring exact equality for non-CVR qualifiers.
bool isMoreQualifiedThan(QualType Other) const;

/// Determine whether this type is at least as qualified as the other
/// given type, requiring exact equality for non-CVR qualifiers.
bool isAtLeastAsQualifiedAs(QualType Other) const;

QualType getNonReferenceType() const;

/// Determine the type of a (typically non-lvalue) expression with the
/// specified result type.
///
/// This routine should be used for expressions for which the return type is
/// explicitly specified (e.g., in a cast or call) and isn't necessarily
/// an lvalue. It removes a top-level reference (since there are no
/// expressions of reference type) and deletes top-level cvr-qualifiers
/// from non-class types (in C++) or all types (in C).
QualType getNonLValueExprType(const ASTContext &Context) const;

/// Return the specified type with any "sugar" removed from
/// the type.  This takes off typedefs, typeof's etc.  If the outer level of
/// the type is already concrete, it returns it unmodified.  This is similar
/// to getting the canonical type, but it doesn't remove *all* typedefs.  For
/// example, it returns "T*" as "T*", (not as "int*"), because the pointer is
/// concrete.
///
/// Qualifiers are left in place.
QualType getDesugaredType(const ASTContext &Context) const {
  return getDesugaredType(*this, Context);
}

SplitQualType getSplitDesugaredType() const {
  return getSplitDesugaredType(*this);
}

/// Return the specified type with one level of "sugar" removed from
/// the type.
///
/// This routine takes off the first typedef, typeof, etc. If the outer level
/// of the type is already concrete, it returns it unmodified.
QualType getSingleStepDesugaredType(const ASTContext &Context) const {
  return getSingleStepDesugaredTypeImpl(*this, Context);
}

/// Returns the specified type after dropping any
/// outer-level parentheses.
QualType IgnoreParens() const {
  if (isa<ParenType>(*this))
    return QualType::IgnoreParens(*this);
  return *this;
}

/// Indicate whether the specified types and qualifiers are identical.
friend bool operator==(const QualType &LHS, const QualType &RHS) {
  return LHS.Value == RHS.Value;
}
friend bool operator!=(const QualType &LHS, const QualType &RHS) {
  return LHS.Value != RHS.Value;
}
friend bool operator<(const QualType &LHS, const QualType &RHS) {
  return LHS.Value < RHS.Value;
}

static std::string getAsString(SplitQualType split,
                               const PrintingPolicy &Policy) {
  return getAsString(split.Ty, split.Quals, Policy);
}
static std::string getAsString(const Type *ty, Qualifiers qs,
                               const PrintingPolicy &Policy);

std::string getAsString() const;
std::string getAsString(const PrintingPolicy &Policy) const;

void print(raw_ostream &OS, const PrintingPolicy &Policy,
           const Twine &PlaceHolder = Twine(),
           unsigned Indentation = 0) const;

static void print(SplitQualType split, raw_ostream &OS,
                  const PrintingPolicy &policy, const Twine &PlaceHolder,
                  unsigned Indentation = 0) {
  return print(split.Ty, split.Quals, OS, policy, PlaceHolder, Indentation);
}

static void print(const Type *ty, Qualifiers qs,
                  raw_ostream &OS, const PrintingPolicy &policy,
                  const Twine &PlaceHolder,
                  unsigned Indentation = 0);

void getAsStringInternal(std::string &Str,
                         const PrintingPolicy &Policy) const;

static void getAsStringInternal(SplitQualType split, std::string &out,
                                const PrintingPolicy &policy) {
  return getAsStringInternal(split.Ty, split.Quals, out, policy);
}

static void getAsStringInternal(const Type *ty, Qualifiers qs,
                                std::string &out,
                                const PrintingPolicy &policy);

class StreamedQualTypeHelper {
  const QualType &T;
  const PrintingPolicy &Policy;
  const Twine &PlaceHolder;
  unsigned Indentation;

public:
  StreamedQualTypeHelper(const QualType &T, const PrintingPolicy &Policy,
                         const Twine &PlaceHolder, unsigned Indentation)
      : T(T), Policy(Policy), PlaceHolder(PlaceHolder),
        Indentation(Indentation) {}

  friend raw_ostream &operator<<(raw_ostream &OS,
                                 const StreamedQualTypeHelper &SQT) {
    SQT.T.print(OS, SQT.Policy, SQT.PlaceHolder, SQT.Indentation);
    return OS;
  }
};

StreamedQualTypeHelper stream(const PrintingPolicy &Policy,
                              const Twine &PlaceHolder = Twine(),
                              unsigned Indentation = 0) const {
  return StreamedQualTypeHelper(*this, Policy, PlaceHolder, Indentation);
}

void dump(const char *s) const;
void dump() const;
void dump(llvm::raw_ostream &OS) const;

void Profile(llvm::FoldingSetNodeID &ID) const {
  ID.AddPointer(getAsOpaquePtr());
}

/// Return the address space of this type.
inline LangAS getAddressSpace() const;

/// Returns gc attribute of this type.
inline Qualifiers::GC getObjCGCAttr() const;

/// true when Type is objc's weak.
bool isObjCGCWeak() const {
  return getObjCGCAttr() == Qualifiers::Weak;
}

/// true when Type is objc's strong.
bool isObjCGCStrong() const {
  return getObjCGCAttr() == Qualifiers::Strong;
}

/// Returns lifetime attribute of this type.
Qualifiers::ObjCLifetime getObjCLifetime() const {
  return getQualifiers().getObjCLifetime();
}

bool hasNonTrivialObjCLifetime() const {
  return getQualifiers().hasNonTrivialObjCLifetime();
}

bool hasStrongOrWeakObjCLifetime() const {
  return getQualifiers().hasStrongOrWeakObjCLifetime();
}

// true when Type is objc's weak and weak is enabled but ARC isn't.
bool isNonWeakInMRRWithObjCWeak(const ASTContext &Context) const;

enum PrimitiveDefaultInitializeKind {
  /// The type does not fall into any of the following categories. Note that
  /// this case is zero-valued so that values of this enum can be used as a
  /// boolean condition for non-triviality.
  PDIK_Trivial,

  /// The type is an Objective-C retainable pointer type that is qualified
  /// with the ARC __strong qualifier.
  PDIK_ARCStrong,

  /// The type is an Objective-C retainable pointer type that is qualified
  /// with the ARC __weak qualifier.
  PDIK_ARCWeak,

  /// The type is a struct containing a field whose type is not PCK_Trivial.
  PDIK_Struct
};

/// Functions to query basic properties of non-trivial C struct types.

/// Check if this is a non-trivial type that would cause a C struct
/// transitively containing this type to be non-trivial to default initialize
/// and return the kind.
PrimitiveDefaultInitializeKind
isNonTrivialToPrimitiveDefaultInitialize() const;

enum PrimitiveCopyKind {
  /// The type does not fall into any of the following categories. Note that
  /// this case is zero-valued so that values of this enum can be used as a
  /// boolean condition for non-triviality.
  PCK_Trivial,

  /// The type would be trivial except that it is volatile-qualified. Types
  /// that fall into one of the other non-trivial cases may additionally be
  /// volatile-qualified.
  PCK_VolatileTrivial,

  /// The type is an Objective-C retainable pointer type that is qualified
  /// with the ARC __strong qualifier.
  PCK_ARCStrong,

  /// The type is an Objective-C retainable pointer type that is qualified
  /// with the ARC __weak qualifier.
  PCK_ARCWeak,

  /// The type is a struct containing a field whose type is neither
  /// PCK_Trivial nor PCK_VolatileTrivial.
  /// Note that a C++ struct type does not necessarily match this; C++ copying
  /// semantics are too complex to express here, in part because they depend
  /// on the exact constructor or assignment operator that is chosen by
  /// overload resolution to do the copy.
  PCK_Struct
};

/// Check if this is a non-trivial type that would cause a C struct
/// transitively containing this type to be non-trivial to copy and return the
/// kind.
PrimitiveCopyKind isNonTrivialToPrimitiveCopy() const;

/// Check if this is a non-trivial type that would cause a C struct
/// transitively containing this type to be non-trivial to destructively
/// move and return the kind. Destructive move in this context is a C++-style
/// move in which the source object is placed in a valid but unspecified state
/// after it is moved, as opposed to a truly destructive move in which the
/// source object is placed in an uninitialized state.
PrimitiveCopyKind isNonTrivialToPrimitiveDestructiveMove() const;

enum DestructionKind {
  DK_none,
  DK_cxx_destructor,
  DK_objc_strong_lifetime,
  DK_objc_weak_lifetime,
  DK_nontrivial_c_struct
};

/// Returns a nonzero value if objects of this type require
/// non-trivial work to clean up after.  Non-zero because it's
/// conceivable that qualifiers (objc_gc(weak)?) could make
/// something require destruction.
DestructionKind isDestructedType() const {
  return isDestructedTypeImpl(*this);
}

/// Check if this is or contains a C union that is non-trivial to
/// default-initialize, which is a union that has a member that is non-trivial
/// to default-initialize. If this returns true,
/// isNonTrivialToPrimitiveDefaultInitialize returns PDIK_Struct.
bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const;

/// Check if this is or contains a C union that is non-trivial to destruct,
/// which is a union that has a member that is non-trivial to destruct. If
/// this returns true, isDestructedType returns DK_nontrivial_c_struct.
bool hasNonTrivialToPrimitiveDestructCUnion() const;

/// Check if this is or contains a C union that is non-trivial to copy, which
/// is a union that has a member that is non-trivial to copy. If this returns
/// true, isNonTrivialToPrimitiveCopy returns PCK_Struct.
bool hasNonTrivialToPrimitiveCopyCUnion() const;

/// Determine whether expressions of the given type are forbidden
/// from being lvalues in C.
///
/// The expression types that are forbidden to be lvalues are:
///   - 'void', but not qualified void
///   - function types
///
/// The exact rule here is C99 6.3.2.1:
///   An lvalue is an expression with an object type or an incomplete
///   type other than void.
bool isCForbiddenLValueType() const;

/// Substitute type arguments for the Objective-C type parameters used in the
/// subject type.
///
/// \param ctx ASTContext in which the type exists.
///
/// \param typeArgs The type arguments that will be substituted for the
/// Objective-C type parameters in the subject type, which are generally
/// computed via \c Type::getObjCSubstitutions. If empty, the type
/// parameters will be replaced with their bounds or id/Class, as appropriate
/// for the context.
///
/// \param context The context in which the subject type was written.
///
/// \returns the resulting type.
QualType substObjCTypeArgs(ASTContext &ctx,
                           ArrayRef<QualType> typeArgs,
                           ObjCSubstitutionContext context) const;

/// Substitute type arguments from an object type for the Objective-C type
/// parameters used in the subject type.
///
/// This operation combines the computation of type arguments for
/// substitution (\c Type::getObjCSubstitutions) with the actual process of
/// substitution (\c QualType::substObjCTypeArgs) for the convenience of
/// callers that need to perform a single substitution in isolation.
///
/// \param objectType The type of the object whose member type we're
/// substituting into. For example, this might be the receiver of a message
/// or the base of a property access.
///
/// \param dc The declaration context from which the subject type was
/// retrieved, which indicates (for example) which type parameters should
/// be substituted.
///
/// \param context The context in which the subject type was written.
///
/// \returns the subject type after replacing all of the Objective-C type
/// parameters with their corresponding arguments.
QualType substObjCMemberType(QualType objectType,
                             const DeclContext *dc,
                             ObjCSubstitutionContext context) const;

/// Strip Objective-C "__kindof" types from the given type.
QualType stripObjCKindOfType(const ASTContext &ctx) const;

/// Remove all qualifiers including _Atomic.
QualType getAtomicUnqualifiedType() const;

1240private:
// These methods are implemented in a separate translation unit;
// "static"-ize them to avoid creating temporary QualTypes in the
// caller.
static bool isConstant(QualType T, const ASTContext& Ctx);
static QualType getDesugaredType(QualType T, const ASTContext &Context);
static SplitQualType getSplitDesugaredType(QualType T);
static SplitQualType getSplitUnqualifiedTypeImpl(QualType type);
static QualType getSingleStepDesugaredTypeImpl(QualType type,
                                               const ASTContext &C);
static QualType IgnoreParens(QualType T);
static DestructionKind isDestructedTypeImpl(QualType type);

/// Check if \param RD is or contains a non-trivial C union.
static bool hasNonTrivialToPrimitiveDefaultInitializeCUnion(const RecordDecl *RD);
static bool hasNonTrivialToPrimitiveDestructCUnion(const RecordDecl *RD);
static bool hasNonTrivialToPrimitiveCopyCUnion(const RecordDecl *RD);
1257};

1259} // namespace clang

1261namespace llvm {

1263/// Implement simplify_type for QualType, so that we can dyn_cast from QualType
1264/// to a specific Type class.
1265template<> struct simplify_type< ::clang::QualType> {
using SimpleType = const ::clang::Type *;

static SimpleType getSimplifiedValue(::clang::QualType Val) {
  return Val.getTypePtr();
}
1271};

1273// Teach SmallPtrSet that QualType is "basically a pointer".
1274template<>
1275struct PointerLikeTypeTraits<clang::QualType> {
static inline void *getAsVoidPointer(clang::QualType P) {
  return P.getAsOpaquePtr();
}

static inline clang::QualType getFromVoidPointer(void *P) {
  return clang::QualType::getFromOpaquePtr(P);
}

// Various qualifiers go in low bits.
enum { NumLowBitsAvailable = 0 };
1286};

1288} // namespace llvm

1290namespace clang {

1292/// Base class that is common to both the \c ExtQuals and \c Type
1293/// classes, which allows \c QualType to access the common fields between the
1294/// two.
1295class ExtQualsTypeCommonBase {
friend class ExtQuals;
friend class QualType;
friend class Type;

/// The "base" type of an extended qualifiers type (\c ExtQuals) or
/// a self-referential pointer (for \c Type).
///
/// This pointer allows an efficient mapping from a QualType to its
/// underlying type pointer.
const Type *const BaseType;

/// The canonical type of this type.  A QualType.
QualType CanonicalType;

ExtQualsTypeCommonBase(const Type *baseType, QualType canon)
    : BaseType(baseType), CanonicalType(canon) {}
1312};

1314/// We can encode up to four bits in the low bits of a
1315/// type pointer, but there are many more type qualifiers that we want
1316/// to be able to apply to an arbitrary type.  Therefore we have this
1317/// struct, intended to be heap-allocated and used by QualType to
1318/// store qualifiers.
1319///
1320/// The current design tags the 'const', 'restrict', and 'volatile' qualifiers
1321/// in three low bits on the QualType pointer; a fourth bit records whether
1322/// the pointer is an ExtQuals node. The extended qualifiers (address spaces,
1323/// Objective-C GC attributes) are much more rare.
1324class ExtQuals : public ExtQualsTypeCommonBase, public llvm::FoldingSetNode {
// NOTE: changing the fast qualifiers should be straightforward as
// long as you don't make 'const' non-fast.
// 1. Qualifiers:
//    a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ).
//       Fast qualifiers must occupy the low-order bits.
//    b) Update Qualifiers::FastWidth and FastMask.
// 2. QualType:
//    a) Update is{Volatile,Restrict}Qualified(), defined inline.
//    b) Update remove{Volatile,Restrict}, defined near the end of
//       this header.
// 3. ASTContext:
//    a) Update get{Volatile,Restrict}Type.

/// The immutable set of qualifiers applied by this node. Always contains
/// extended qualifiers.
Qualifiers Quals;

ExtQuals *this_() { return this; }

1344public:
ExtQuals(const Type *baseType, QualType canon, Qualifiers quals)
    : ExtQualsTypeCommonBase(baseType,
                             canon.isNull() ? QualType(this_(), 0) : canon),
      Quals(quals) {
  assert(Quals.hasNonFastQualifiers()((Quals.hasNonFastQualifiers() && "ExtQuals created with no fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("Quals.hasNonFastQualifiers() && \"ExtQuals created with no fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1350, __PRETTY_FUNCTION__))
         && "ExtQuals created with no fast qualifiers")((Quals.hasNonFastQualifiers() && "ExtQuals created with no fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("Quals.hasNonFastQualifiers() && \"ExtQuals created with no fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1350, __PRETTY_FUNCTION__));
  assert(!Quals.hasFastQualifiers()((!Quals.hasFastQualifiers() && "ExtQuals created with fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"ExtQuals created with fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1352, __PRETTY_FUNCTION__))
         && "ExtQuals created with fast qualifiers")((!Quals.hasFastQualifiers() && "ExtQuals created with fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"ExtQuals created with fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1352, __PRETTY_FUNCTION__));
}

Qualifiers getQualifiers() const { return Quals; }

bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); }
Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); }

bool hasObjCLifetime() const { return Quals.hasObjCLifetime(); }
Qualifiers::ObjCLifetime getObjCLifetime() const {
  return Quals.getObjCLifetime();
}

bool hasAddressSpace() const { return Quals.hasAddressSpace(); }
LangAS getAddressSpace() const { return Quals.getAddressSpace(); }

const Type *getBaseType() const { return BaseType; }

1370public:
void Profile(llvm::FoldingSetNodeID &ID) const {
  Profile(ID, getBaseType(), Quals);
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    const Type *BaseType,
                    Qualifiers Quals) {
  assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!")((!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"fast qualifiers in ExtQuals hash!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1378, __PRETTY_FUNCTION__));
  ID.AddPointer(BaseType);
  Quals.Profile(ID);
}
1382};

1384/// The kind of C++11 ref-qualifier associated with a function type.
1385/// This determines whether a member function's "this" object can be an
1386/// lvalue, rvalue, or neither.
1387enum RefQualifierKind {
/// No ref-qualifier was provided.
RQ_None = 0,

/// An lvalue ref-qualifier was provided (\c &).
RQ_LValue,

/// An rvalue ref-qualifier was provided (\c &&).
RQ_RValue
1396};

1398/// Which keyword(s) were used to create an AutoType.
1399enum class AutoTypeKeyword {
/// auto
Auto,

/// decltype(auto)
DecltypeAuto,

/// __auto_type (GNU extension)
GNUAutoType
1408};

1410/// The base class of the type hierarchy.
1411///
1412/// A central concept with types is that each type always has a canonical
1413/// type.  A canonical type is the type with any typedef names stripped out
1414/// of it or the types it references.  For example, consider:
1415///
1416///  typedef int  foo;
1417///  typedef foo* bar;
1418///    'int *'    'foo *'    'bar'
1419///
1420/// There will be a Type object created for 'int'.  Since int is canonical, its
1421/// CanonicalType pointer points to itself.  There is also a Type for 'foo' (a
1422/// TypedefType).  Its CanonicalType pointer points to the 'int' Type.  Next
1423/// there is a PointerType that represents 'int*', which, like 'int', is
1424/// canonical.  Finally, there is a PointerType type for 'foo*' whose canonical
1425/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type
1426/// is also 'int*'.
1427///
1428/// Non-canonical types are useful for emitting diagnostics, without losing
1429/// information about typedefs being used.  Canonical types are useful for type
1430/// comparisons (they allow by-pointer equality tests) and useful for reasoning
1431/// about whether something has a particular form (e.g. is a function type),
1432/// because they implicitly, recursively, strip all typedefs out of a type.
1433///
1434/// Types, once created, are immutable.
1435///
1436class alignas(8) Type : public ExtQualsTypeCommonBase {
1437public:
enum TypeClass {
1439#define TYPE(Class, Base) Class,
1440#define LAST_TYPE(Class) TypeLast = Class
1441#define ABSTRACT_TYPE(Class, Base)
1442#include "clang/AST/TypeNodes.inc"
};

1445private:
/// Bitfields required by the Type class.
class TypeBitfields {
  friend class Type;
  template <class T> friend class TypePropertyCache;

  /// TypeClass bitfield - Enum that specifies what subclass this belongs to.
  unsigned TC : 8;

  /// Whether this type is a dependent type (C++ [temp.dep.type]).
  unsigned Dependent : 1;

  /// Whether this type somehow involves a template parameter, even
  /// if the resolution of the type does not depend on a template parameter.
  unsigned InstantiationDependent : 1;

  /// Whether this type is a variably-modified type (C99 6.7.5).
  unsigned VariablyModified : 1;

  /// Whether this type contains an unexpanded parameter pack
  /// (for C++11 variadic templates).
  unsigned ContainsUnexpandedParameterPack : 1;

  /// True if the cache (i.e. the bitfields here starting with
  /// 'Cache') is valid.
  mutable unsigned CacheValid : 1;

  /// Linkage of this type.
  mutable unsigned CachedLinkage : 3;

  /// Whether this type involves and local or unnamed types.
  mutable unsigned CachedLocalOrUnnamed : 1;

  /// Whether this type comes from an AST file.
  mutable unsigned FromAST : 1;

  bool isCacheValid() const {
    return CacheValid;
  }

  Linkage getLinkage() const {
    assert(isCacheValid() && "getting linkage from invalid cache")((isCacheValid() && "getting linkage from invalid cache"
) ? static_cast<void> (0) : __assert_fail ("isCacheValid() && \"getting linkage from invalid cache\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1486, __PRETTY_FUNCTION__));
    return static_cast<Linkage>(CachedLinkage);
  }

  bool hasLocalOrUnnamedType() const {
    assert(isCacheValid() && "getting linkage from invalid cache")((isCacheValid() && "getting linkage from invalid cache"
) ? static_cast<void> (0) : __assert_fail ("isCacheValid() && \"getting linkage from invalid cache\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 1491, __PRETTY_FUNCTION__));
    return CachedLocalOrUnnamed;
  }
};
enum { NumTypeBits = 18 };

1497protected:
// These classes allow subclasses to somewhat cleanly pack bitfields
// into Type.

class ArrayTypeBitfields {
  friend class ArrayType;

  unsigned : NumTypeBits;

  /// CVR qualifiers from declarations like
  /// 'int X[static restrict 4]'. For function parameters only.
  unsigned IndexTypeQuals : 3;

  /// Storage class qualifiers from declarations like
  /// 'int X[static restrict 4]'. For function parameters only.
  /// Actually an ArrayType::ArraySizeModifier.
  unsigned SizeModifier : 3;
};

class BuiltinTypeBitfields {
  friend class BuiltinType;

  unsigned : NumTypeBits;

  /// The kind (BuiltinType::Kind) of builtin type this is.
  unsigned Kind : 8;
};

/// FunctionTypeBitfields store various bits belonging to FunctionProtoType.
/// Only common bits are stored here. Additional uncommon bits are stored
/// in a trailing object after FunctionProtoType.
class FunctionTypeBitfields {
  friend class FunctionProtoType;
  friend class FunctionType;

  unsigned : NumTypeBits;

  /// Extra information which affects how the function is called, like
  /// regparm and the calling convention.
  unsigned ExtInfo : 12;

  /// The ref-qualifier associated with a \c FunctionProtoType.
  ///
  /// This is a value of type \c RefQualifierKind.
  unsigned RefQualifier : 2;

  /// Used only by FunctionProtoType, put here to pack with the
  /// other bitfields.
  /// The qualifiers are part of FunctionProtoType because...
  ///
  /// C++ 8.3.5p4: The return type, the parameter type list and the
  /// cv-qualifier-seq, [...], are part of the function type.
  unsigned FastTypeQuals : Qualifiers::FastWidth;
  /// Whether this function has extended Qualifiers.
  unsigned HasExtQuals : 1;

  /// The number of parameters this function has, not counting '...'.
  /// According to [implimits] 8 bits should be enough here but this is
  /// somewhat easy to exceed with metaprogramming and so we would like to
  /// keep NumParams as wide as reasonably possible.
  unsigned NumParams : 16;

  /// The type of exception specification this function has.
  unsigned ExceptionSpecType : 4;

  /// Whether this function has extended parameter information.
  unsigned HasExtParameterInfos : 1;

  /// Whether the function is variadic.
  unsigned Variadic : 1;

  /// Whether this function has a trailing return type.
  unsigned HasTrailingReturn : 1;
};

class ObjCObjectTypeBitfields {
  friend class ObjCObjectType;

  unsigned : NumTypeBits;

  /// The number of type arguments stored directly on this object type.
  unsigned NumTypeArgs : 7;

  /// The number of protocols stored directly on this object type.
  unsigned NumProtocols : 6;

  /// Whether this is a "kindof" type.
  unsigned IsKindOf : 1;
};

class ReferenceTypeBitfields {
  friend class ReferenceType;

  unsigned : NumTypeBits;

  /// True if the type was originally spelled with an lvalue sigil.
  /// This is never true of rvalue references but can also be false
  /// on lvalue references because of C++0x [dcl.typedef]p9,
  /// as follows:
  ///
  ///   typedef int &ref;    // lvalue, spelled lvalue
  ///   typedef int &&rvref; // rvalue
  ///   ref &a;              // lvalue, inner ref, spelled lvalue
  ///   ref &&a;             // lvalue, inner ref
  ///   rvref &a;            // lvalue, inner ref, spelled lvalue
  ///   rvref &&a;           // rvalue, inner ref
  unsigned SpelledAsLValue : 1;

  /// True if the inner type is a reference type.  This only happens
  /// in non-canonical forms.
  unsigned InnerRef : 1;
};

class TypeWithKeywordBitfields {
  friend class TypeWithKeyword;

  unsigned : NumTypeBits;

  /// An ElaboratedTypeKeyword.  8 bits for efficient access.
  unsigned Keyword : 8;
};

enum { NumTypeWithKeywordBits = 8 };

class ElaboratedTypeBitfields {
  friend class ElaboratedType;

  unsigned : NumTypeBits;
  unsigned : NumTypeWithKeywordBits;

  /// Whether the ElaboratedType has a trailing OwnedTagDecl.
  unsigned HasOwnedTagDecl : 1;
};

class VectorTypeBitfields {
  friend class VectorType;
  friend class DependentVectorType;

  unsigned : NumTypeBits;

  /// The kind of vector, either a generic vector type or some
  /// target-specific vector type such as for AltiVec or Neon.
  unsigned VecKind : 3;

  /// The number of elements in the vector.
  unsigned NumElements : 29 - NumTypeBits;

  enum { MaxNumElements = (1 << (29 - NumTypeBits)) - 1 };
};

class AttributedTypeBitfields {
  friend class AttributedType;

  unsigned : NumTypeBits;

  /// An AttributedType::Kind
  unsigned AttrKind : 32 - NumTypeBits;
};

class AutoTypeBitfields {
  friend class AutoType;

  unsigned : NumTypeBits;

  /// Was this placeholder type spelled as 'auto', 'decltype(auto)',
  /// or '__auto_type'?  AutoTypeKeyword value.
  unsigned Keyword : 2;
};

class SubstTemplateTypeParmPackTypeBitfields {
  friend class SubstTemplateTypeParmPackType;

  unsigned : NumTypeBits;

  /// The number of template arguments in \c Arguments, which is
  /// expected to be able to hold at least 1024 according to [implimits].
  /// However as this limit is somewhat easy to hit with template
  /// metaprogramming we'd prefer to keep it as large as possible.
  /// At the moment it has been left as a non-bitfield since this type
  /// safely fits in 64 bits as an unsigned, so there is no reason to
  /// introduce the performance impact of a bitfield.
  unsigned NumArgs;
};

class TemplateSpecializationTypeBitfields {
  friend class TemplateSpecializationType;

  unsigned : NumTypeBits;

  /// Whether this template specialization type is a substituted type alias.
  unsigned TypeAlias : 1;

  /// The number of template arguments named in this class template
  /// specialization, which is expected to be able to hold at least 1024
  /// according to [implimits]. However, as this limit is somewhat easy to
  /// hit with template metaprogramming we'd prefer to keep it as large
  /// as possible. At the moment it has been left as a non-bitfield since
  /// this type safely fits in 64 bits as an unsigned, so there is no reason
  /// to introduce the performance impact of a bitfield.
  unsigned NumArgs;
};

class DependentTemplateSpecializationTypeBitfields {
  friend class DependentTemplateSpecializationType;

  unsigned : NumTypeBits;
  unsigned : NumTypeWithKeywordBits;

  /// The number of template arguments named in this class template
  /// specialization, which is expected to be able to hold at least 1024
  /// according to [implimits]. However, as this limit is somewhat easy to
  /// hit with template metaprogramming we'd prefer to keep it as large
  /// as possible. At the moment it has been left as a non-bitfield since
  /// this type safely fits in 64 bits as an unsigned, so there is no reason
  /// to introduce the performance impact of a bitfield.
  unsigned NumArgs;
};

class PackExpansionTypeBitfields {
  friend class PackExpansionType;

  unsigned : NumTypeBits;

  /// The number of expansions that this pack expansion will
  /// generate when substituted (+1), which is expected to be able to
  /// hold at least 1024 according to [implimits]. However, as this limit
  /// is somewhat easy to hit with template metaprogramming we'd prefer to
  /// keep it as large as possible. At the moment it has been left as a
  /// non-bitfield since this type safely fits in 64 bits as an unsigned, so
  /// there is no reason to introduce the performance impact of a bitfield.
  ///
  /// This field will only have a non-zero value when some of the parameter
  /// packs that occur within the pattern have been substituted but others
  /// have not.
  unsigned NumExpansions;
};

union {
  TypeBitfields TypeBits;
  ArrayTypeBitfields ArrayTypeBits;
  AttributedTypeBitfields AttributedTypeBits;
  AutoTypeBitfields AutoTypeBits;
  BuiltinTypeBitfields BuiltinTypeBits;
  FunctionTypeBitfields FunctionTypeBits;
  ObjCObjectTypeBitfields ObjCObjectTypeBits;
  ReferenceTypeBitfields ReferenceTypeBits;
  TypeWithKeywordBitfields TypeWithKeywordBits;
  ElaboratedTypeBitfields ElaboratedTypeBits;
  VectorTypeBitfields VectorTypeBits;
  SubstTemplateTypeParmPackTypeBitfields SubstTemplateTypeParmPackTypeBits;
  TemplateSpecializationTypeBitfields TemplateSpecializationTypeBits;
  DependentTemplateSpecializationTypeBitfields
    DependentTemplateSpecializationTypeBits;
  PackExpansionTypeBitfields PackExpansionTypeBits;

  static_assert(sizeof(TypeBitfields) <= 8,
                "TypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(ArrayTypeBitfields) <= 8,
                "ArrayTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(AttributedTypeBitfields) <= 8,
                "AttributedTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(AutoTypeBitfields) <= 8,
                "AutoTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(BuiltinTypeBitfields) <= 8,
                "BuiltinTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(FunctionTypeBitfields) <= 8,
                "FunctionTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(ObjCObjectTypeBitfields) <= 8,
                "ObjCObjectTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(ReferenceTypeBitfields) <= 8,
                "ReferenceTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(TypeWithKeywordBitfields) <= 8,
                "TypeWithKeywordBitfields is larger than 8 bytes!");
  static_assert(sizeof(ElaboratedTypeBitfields) <= 8,
                "ElaboratedTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(VectorTypeBitfields) <= 8,
                "VectorTypeBitfields is larger than 8 bytes!");
  static_assert(sizeof(SubstTemplateTypeParmPackTypeBitfields) <= 8,
                "SubstTemplateTypeParmPackTypeBitfields is larger"
                " than 8 bytes!");
  static_assert(sizeof(TemplateSpecializationTypeBitfields) <= 8,
                "TemplateSpecializationTypeBitfields is larger"
                " than 8 bytes!");
  static_assert(sizeof(DependentTemplateSpecializationTypeBitfields) <= 8,
                "DependentTemplateSpecializationTypeBitfields is larger"
                " than 8 bytes!");
  static_assert(sizeof(PackExpansionTypeBitfields) <= 8,
                "PackExpansionTypeBitfields is larger than 8 bytes");
};

1787private:
template <class T> friend class TypePropertyCache;

/// Set whether this type comes from an AST file.
void setFromAST(bool V = true) const {
  TypeBits.FromAST = V;
}

1795protected:
friend class ASTContext;

Type(TypeClass tc, QualType canon, bool Dependent,
     bool InstantiationDependent, bool VariablyModified,
     bool ContainsUnexpandedParameterPack)
    : ExtQualsTypeCommonBase(this,
                             canon.isNull() ? QualType(this_(), 0) : canon) {
  TypeBits.TC = tc;
  TypeBits.Dependent = Dependent;
  TypeBits.InstantiationDependent = Dependent || InstantiationDependent;
  TypeBits.VariablyModified = VariablyModified;
  TypeBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
  TypeBits.CacheValid = false;
  TypeBits.CachedLocalOrUnnamed = false;
  TypeBits.CachedLinkage = NoLinkage;
  TypeBits.FromAST = false;
}

// silence VC++ warning C4355: 'this' : used in base member initializer list
Type *this_() { return this; }

void setDependent(bool D = true) {
  TypeBits.Dependent = D;
  if (D)
    TypeBits.InstantiationDependent = true;
}

void setInstantiationDependent(bool D = true) {
  TypeBits.InstantiationDependent = D; }

void setVariablyModified(bool VM = true) { TypeBits.VariablyModified = VM; }

void setContainsUnexpandedParameterPack(bool PP = true) {
  TypeBits.ContainsUnexpandedParameterPack = PP;
}

1832public:
friend class ASTReader;
friend class ASTWriter;

Type(const Type &) = delete;
Type(Type &&) = delete;
Type &operator=(const Type &) = delete;
Type &operator=(Type &&) = delete;

TypeClass getTypeClass() const { return static_cast<TypeClass>(TypeBits.TC); }

/// Whether this type comes from an AST file.
bool isFromAST() const { return TypeBits.FromAST; }

/// Whether this type is or contains an unexpanded parameter
/// pack, used to support C++0x variadic templates.
///
/// A type that contains a parameter pack shall be expanded by the
/// ellipsis operator at some point. For example, the typedef in the
/// following example contains an unexpanded parameter pack 'T':
///
/// \code
/// template<typename ...T>
/// struct X {
///   typedef T* pointer_types; // ill-formed; T is a parameter pack.
/// };
/// \endcode
///
/// Note that this routine does not specify which
bool containsUnexpandedParameterPack() const {
  return TypeBits.ContainsUnexpandedParameterPack;
}

/// Determines if this type would be canonical if it had no further
/// qualification.
bool isCanonicalUnqualified() const {
  return CanonicalType == QualType(this, 0);
}

/// Pull a single level of sugar off of this locally-unqualified type.
/// Users should generally prefer SplitQualType::getSingleStepDesugaredType()
/// or QualType::getSingleStepDesugaredType(const ASTContext&).
QualType getLocallyUnqualifiedSingleStepDesugaredType() const;

/// Types are partitioned into 3 broad categories (C99 6.2.5p1):
/// object types, function types, and incomplete types.

/// Return true if this is an incomplete type.
/// A type that can describe objects, but which lacks information needed to
/// determine its size (e.g. void, or a fwd declared struct). Clients of this
/// routine will need to determine if the size is actually required.
///
/// Def If non-null, and the type refers to some kind of declaration
/// that can be completed (such as a C struct, C++ class, or Objective-C
/// class), will be set to the declaration.
bool isIncompleteType(NamedDecl **Def = nullptr) const;

/// Return true if this is an incomplete or object
/// type, in other words, not a function type.
bool isIncompleteOrObjectType() const {
  return !isFunctionType();
}

/// Determine whether this type is an object type.
bool isObjectType() const {
  // C++ [basic.types]p8:
  //   An object type is a (possibly cv-qualified) type that is not a
  //   function type, not a reference type, and not a void type.
  return !isReferenceType() && !isFunctionType() && !isVoidType();
}

/// Return true if this is a literal type
/// (C++11 [basic.types]p10)
bool isLiteralType(const ASTContext &Ctx) const;

/// Test if this type is a standard-layout type.
/// (C++0x [basic.type]p9)
bool isStandardLayoutType() const;

/// Helper methods to distinguish type categories. All type predicates
/// operate on the canonical type, ignoring typedefs and qualifiers.

/// Returns true if the type is a builtin type.
bool isBuiltinType() const;

/// Test for a particular builtin type.
bool isSpecificBuiltinType(unsigned K) const;

/// Test for a type which does not represent an actual type-system type but
/// is instead used as a placeholder for various convenient purposes within
/// Clang.  All such types are BuiltinTypes.
bool isPlaceholderType() const;
const BuiltinType *getAsPlaceholderType() const;

/// Test for a specific placeholder type.
bool isSpecificPlaceholderType(unsigned K) const;

/// Test for a placeholder type other than Overload; see
/// BuiltinType::isNonOverloadPlaceholderType.
bool isNonOverloadPlaceholderType() const;

/// isIntegerType() does *not* include complex integers (a GCC extension).
/// isComplexIntegerType() can be used to test for complex integers.
bool isIntegerType() const;     // C99 6.2.5p17 (int, char, bool, enum)
bool isEnumeralType() const;

/// Determine whether this type is a scoped enumeration type.
bool isScopedEnumeralType() const;
bool isBooleanType() const;
bool isCharType() const;
bool isWideCharType() const;
bool isChar8Type() const;
bool isChar16Type() const;
bool isChar32Type() const;
bool isAnyCharacterType() const;
bool isIntegralType(const ASTContext &Ctx) const;

/// Determine whether this type is an integral or enumeration type.
bool isIntegralOrEnumerationType() const;

/// Determine whether this type is an integral or unscoped enumeration type.
bool isIntegralOrUnscopedEnumerationType() const;

/// Floating point categories.
bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double)
/// isComplexType() does *not* include complex integers (a GCC extension).
/// isComplexIntegerType() can be used to test for complex integers.
bool isComplexType() const;      // C99 6.2.5p11 (complex)
bool isAnyComplexType() const;   // C99 6.2.5p11 (complex) + Complex Int.
bool isFloatingType() const;     // C99 6.2.5p11 (real floating + complex)
bool isHalfType() const;         // OpenCL 6.1.1.1, NEON (IEEE 754-2008 half)
bool isFloat16Type() const;      // C11 extension ISO/IEC TS 18661
bool isFloat128Type() const;
bool isRealType() const;         // C99 6.2.5p17 (real floating + integer)
bool isArithmeticType() const;   // C99 6.2.5p18 (integer + floating)
bool isVoidType() const;         // C99 6.2.5p19
bool isScalarType() const;       // C99 6.2.5p21 (arithmetic + pointers)
bool isAggregateType() const;
bool isFundamentalType() const;
bool isCompoundType() const;

// Type Predicates: Check to see if this type is structurally the specified
// type, ignoring typedefs and qualifiers.
bool isFunctionType() const;
bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); }
bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); }
bool isPointerType() const;
bool isAnyPointerType() const;   // Any C pointer or ObjC object pointer
bool isBlockPointerType() const;
bool isVoidPointerType() const;
bool isReferenceType() const;
bool isLValueReferenceType() const;
bool isRValueReferenceType() const;
bool isFunctionPointerType() const;
bool isFunctionReferenceType() const;
bool isMemberPointerType() const;
bool isMemberFunctionPointerType() const;
bool isMemberDataPointerType() const;
bool isArrayType() const;
bool isConstantArrayType() const;
bool isIncompleteArrayType() const;
bool isVariableArrayType() const;
bool isDependentSizedArrayType() const;
bool isRecordType() const;
bool isClassType() const;
bool isStructureType() const;
bool isObjCBoxableRecordType() const;
bool isInterfaceType() const;
bool isStructureOrClassType() const;
bool isUnionType() const;
bool isComplexIntegerType() const;            // GCC _Complex integer type.
bool isVectorType() const;                    // GCC vector type.
bool isExtVectorType() const;                 // Extended vector type.
bool isDependentAddressSpaceType() const;     // value-dependent address space qualifier
bool isObjCObjectPointerType() const;         // pointer to ObjC object
bool isObjCRetainableType() const;            // ObjC object or block pointer
bool isObjCLifetimeType() const;              // (array of)* retainable type
bool isObjCIndirectLifetimeType() const;      // (pointer to)* lifetime type
bool isObjCNSObjectType() const;              // __attribute__((NSObject))
bool isObjCIndependentClassType() const;      // __attribute__((objc_independent_class))
// FIXME: change this to 'raw' interface type, so we can used 'interface' type
// for the common case.
bool isObjCObjectType() const;                // NSString or typeof(*(id)0)
bool isObjCQualifiedInterfaceType() const;    // NSString<foo>
bool isObjCQualifiedIdType() const;           // id<foo>
bool isObjCQualifiedClassType() const;        // Class<foo>
bool isObjCObjectOrInterfaceType() const;
bool isObjCIdType() const;                    // id
bool isDecltypeType() const;
/// Was this type written with the special inert-in-ARC __unsafe_unretained
/// qualifier?
///
/// This approximates the answer to the following question: if this
/// translation unit were compiled in ARC, would this type be qualified
/// with __unsafe_unretained?
bool isObjCInertUnsafeUnretainedType() const {
  return hasAttr(attr::ObjCInertUnsafeUnretained);
}

/// Whether the type is Objective-C 'id' or a __kindof type of an
/// object type, e.g., __kindof NSView * or __kindof id
/// <NSCopying>.
///
/// \param bound Will be set to the bound on non-id subtype types,
/// which will be (possibly specialized) Objective-C class type, or
/// null for 'id.
bool isObjCIdOrObjectKindOfType(const ASTContext &ctx,
                                const ObjCObjectType *&bound) const;

bool isObjCClassType() const;                 // Class

/// Whether the type is Objective-C 'Class' or a __kindof type of an
/// Class type, e.g., __kindof Class <NSCopying>.
///
/// Unlike \c isObjCIdOrObjectKindOfType, there is no relevant bound
/// here because Objective-C's type system cannot express "a class
/// object for a subclass of NSFoo".
bool isObjCClassOrClassKindOfType() const;

bool isBlockCompatibleObjCPointerType(ASTContext &ctx) const;
bool isObjCSelType() const;                 // Class
bool isObjCBuiltinType() const;               // 'id' or 'Class'
bool isObjCARCBridgableType() const;
bool isCARCBridgableType() const;
bool isTemplateTypeParmType() const;          // C++ template type parameter
bool isNullPtrType() const;                   // C++11 std::nullptr_t
bool isNothrowT() const;                      // C++   std::nothrow_t
bool isAlignValT() const;                     // C++17 std::align_val_t
bool isStdByteType() const;                   // C++17 std::byte
bool isAtomicType() const;                    // C11 _Atomic()

2063#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
bool is##Id##Type() const;
2065#include "clang/Basic/OpenCLImageTypes.def"

bool isImageType() const;                     // Any OpenCL image type

bool isSamplerT() const;                      // OpenCL sampler_t
bool isEventT() const;                        // OpenCL event_t
bool isClkEventT() const;                     // OpenCL clk_event_t
bool isQueueT() const;                        // OpenCL queue_t
bool isReserveIDT() const;                    // OpenCL reserve_id_t

2075#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
bool is##Id##Type() const;
2077#include "clang/Basic/OpenCLExtensionTypes.def"
// Type defined in cl_intel_device_side_avc_motion_estimation OpenCL extension
bool isOCLIntelSubgroupAVCType() const;
bool isOCLExtOpaqueType() const;              // Any OpenCL extension type

bool isPipeType() const;                      // OpenCL pipe type
bool isOpenCLSpecificType() const;            // Any OpenCL specific type

/// Determines if this type, which must satisfy
/// isObjCLifetimeType(), is implicitly __unsafe_unretained rather
/// than implicitly __strong.
bool isObjCARCImplicitlyUnretainedType() const;

/// Return the implicit lifetime for this type, which must not be dependent.
Qualifiers::ObjCLifetime getObjCARCImplicitLifetime() const;

enum ScalarTypeKind {
  STK_CPointer,
  STK_BlockPointer,
  STK_ObjCObjectPointer,
  STK_MemberPointer,
  STK_Bool,
  STK_Integral,
  STK_Floating,
  STK_IntegralComplex,
  STK_FloatingComplex,
  STK_FixedPoint
};

/// Given that this is a scalar type, classify it.
ScalarTypeKind getScalarTypeKind() const;

/// Whether this type is a dependent type, meaning that its definition
/// somehow depends on a template parameter (C++ [temp.dep.type]).
bool isDependentType() const { return TypeBits.Dependent; }

/// Determine whether this type is an instantiation-dependent type,
/// meaning that the type involves a template parameter (even if the
/// definition does not actually depend on the type substituted for that
/// template parameter).
bool isInstantiationDependentType() const {
  return TypeBits.InstantiationDependent;
}

/// Determine whether this type is an undeduced type, meaning that
/// it somehow involves a C++11 'auto' type or similar which has not yet been
/// deduced.
bool isUndeducedType() const;

/// Whether this type is a variably-modified type (C99 6.7.5).
bool isVariablyModifiedType() const { return TypeBits.VariablyModified; }

/// Whether this type involves a variable-length array type
/// with a definite size.
bool hasSizedVLAType() const;

/// Whether this type is or contains a local or unnamed type.
bool hasUnnamedOrLocalType() const;

bool isOverloadableType() const;

/// Determine wither this type is a C++ elaborated-type-specifier.
bool isElaboratedTypeSpecifier() const;

bool canDecayToPointerType() const;

/// Whether this type is represented natively as a pointer.  This includes
/// pointers, references, block pointers, and Objective-C interface,
/// qualified id, and qualified interface types, as well as nullptr_t.
bool hasPointerRepresentation() const;

/// Whether this type can represent an objective pointer type for the
/// purpose of GC'ability
bool hasObjCPointerRepresentation() const;

/// Determine whether this type has an integer representation
/// of some sort, e.g., it is an integer type or a vector.
bool hasIntegerRepresentation() const;

/// Determine whether this type has an signed integer representation
/// of some sort, e.g., it is an signed integer type or a vector.
bool hasSignedIntegerRepresentation() const;

/// Determine whether this type has an unsigned integer representation
/// of some sort, e.g., it is an unsigned integer type or a vector.
bool hasUnsignedIntegerRepresentation() const;

/// Determine whether this type has a floating-point representation
/// of some sort, e.g., it is a floating-point type or a vector thereof.
bool hasFloatingRepresentation() const;

// Type Checking Functions: Check to see if this type is structurally the
// specified type, ignoring typedefs and qualifiers, and return a pointer to
// the best type we can.
const RecordType *getAsStructureType() const;
/// NOTE: getAs*ArrayType are methods on ASTContext.
const RecordType *getAsUnionType() const;
const ComplexType *getAsComplexIntegerType() const; // GCC complex int type.
const ObjCObjectType *getAsObjCInterfaceType() const;

// The following is a convenience method that returns an ObjCObjectPointerType
// for object declared using an interface.
const ObjCObjectPointerType *getAsObjCInterfacePointerType() const;
const ObjCObjectPointerType *getAsObjCQualifiedIdType() const;
const ObjCObjectPointerType *getAsObjCQualifiedClassType() const;
const ObjCObjectType *getAsObjCQualifiedInterfaceType() const;

/// Retrieves the CXXRecordDecl that this type refers to, either
/// because the type is a RecordType or because it is the injected-class-name
/// type of a class template or class template partial specialization.
CXXRecordDecl *getAsCXXRecordDecl() const;

/// Retrieves the RecordDecl this type refers to.
RecordDecl *getAsRecordDecl() const;

/// Retrieves the TagDecl that this type refers to, either
/// because the type is a TagType or because it is the injected-class-name
/// type of a class template or class template partial specialization.
TagDecl *getAsTagDecl() const;

/// If this is a pointer or reference to a RecordType, return the
/// CXXRecordDecl that the type refers to.
///
/// If this is not a pointer or reference, or the type being pointed to does
/// not refer to a CXXRecordDecl, returns NULL.
const CXXRecordDecl *getPointeeCXXRecordDecl() const;

/// Get the DeducedType whose type will be deduced for a variable with
/// an initializer of this type. This looks through declarators like pointer
/// types, but not through decltype or typedefs.
DeducedType *getContainedDeducedType() const;

/// Get the AutoType whose type will be deduced for a variable with
/// an initializer of this type. This looks through declarators like pointer
/// types, but not through decltype or typedefs.
AutoType *getContainedAutoType() const {
  return dyn_cast_or_null<AutoType>(getContainedDeducedType());
}

/// Determine whether this type was written with a leading 'auto'
/// corresponding to a trailing return type (possibly for a nested
/// function type within a pointer to function type or similar).
bool hasAutoForTrailingReturnType() const;

/// Member-template getAs<specific type>'.  Look through sugar for
/// an instance of \<specific type>.   This scheme will eventually
/// replace the specific getAsXXXX methods above.
///
/// There are some specializations of this member template listed
/// immediately following this class.
template <typename T> const T *getAs() const;

/// Member-template getAsAdjusted<specific type>. Look through specific kinds
/// of sugar (parens, attributes, etc) for an instance of \<specific type>.
/// This is used when you need to walk over sugar nodes that represent some
/// kind of type adjustment from a type that was written as a \<specific type>
/// to another type that is still canonically a \<specific type>.
template <typename T> const T *getAsAdjusted() const;

/// A variant of getAs<> for array types which silently discards
/// qualifiers from the outermost type.
const ArrayType *getAsArrayTypeUnsafe() const;

/// Member-template castAs<specific type>.  Look through sugar for
/// the underlying instance of \<specific type>.
///
/// This method has the same relationship to getAs<T> as cast<T> has
/// to dyn_cast<T>; which is to say, the underlying type *must*
/// have the intended type, and this method will never return null.
template <typename T> const T *castAs() const;

/// A variant of castAs<> for array type which silently discards
/// qualifiers from the outermost type.
const ArrayType *castAsArrayTypeUnsafe() const;

/// Determine whether this type had the specified attribute applied to it
/// (looking through top-level type sugar).
bool hasAttr(attr::Kind AK) const;

/// Get the base element type of this type, potentially discarding type
/// qualifiers.  This should never be used when type qualifiers
/// are meaningful.
const Type *getBaseElementTypeUnsafe() const;

/// If this is an array type, return the element type of the array,
/// potentially with type qualifiers missing.
/// This should never be used when type qualifiers are meaningful.
const Type *getArrayElementTypeNoTypeQual() const;

/// If this is a pointer type, return the pointee type.
/// If this is an array type, return the array element type.
/// This should never be used when type qualifiers are meaningful.
const Type *getPointeeOrArrayElementType() const;

/// If this is a pointer, ObjC object pointer, or block
/// pointer, this returns the respective pointee.
QualType getPointeeType() const;

/// Return the specified type with any "sugar" removed from the type,
/// removing any typedefs, typeofs, etc., as well as any qualifiers.
const Type *getUnqualifiedDesugaredType() const;

/// More type predicates useful for type checking/promotion
bool isPromotableIntegerType() const; // C99 6.3.1.1p2

/// Return true if this is an integer type that is
/// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..],
/// or an enum decl which has a signed representation.
bool isSignedIntegerType() const;

/// Return true if this is an integer type that is
/// unsigned, according to C99 6.2.5p6 [which returns true for _Bool],
/// or an enum decl which has an unsigned representation.
bool isUnsignedIntegerType() const;

/// Determines whether this is an integer type that is signed or an
/// enumeration types whose underlying type is a signed integer type.
bool isSignedIntegerOrEnumerationType() const;

/// Determines whether this is an integer type that is unsigned or an
/// enumeration types whose underlying type is a unsigned integer type.
bool isUnsignedIntegerOrEnumerationType() const;

/// Return true if this is a fixed point type according to
/// ISO/IEC JTC1 SC22 WG14 N1169.
bool isFixedPointType() const;

/// Return true if this is a fixed point or integer type.
bool isFixedPointOrIntegerType() const;

/// Return true if this is a saturated fixed point type according to
/// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
bool isSaturatedFixedPointType() const;

/// Return true if this is a saturated fixed point type according to
/// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
bool isUnsaturatedFixedPointType() const;

/// Return true if this is a fixed point type that is signed according
/// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
bool isSignedFixedPointType() const;

/// Return true if this is a fixed point type that is unsigned according
/// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
bool isUnsignedFixedPointType() const;

/// Return true if this is not a variable sized type,
/// according to the rules of C99 6.7.5p3.  It is not legal to call this on
/// incomplete types.
bool isConstantSizeType() const;

/// Returns true if this type can be represented by some
/// set of type specifiers.
bool isSpecifierType() const;

/// Determine the linkage of this type.
Linkage getLinkage() const;

/// Determine the visibility of this type.
Visibility getVisibility() const {
  return getLinkageAndVisibility().getVisibility();
}

/// Return true if the visibility was explicitly set is the code.
bool isVisibilityExplicit() const {
  return getLinkageAndVisibility().isVisibilityExplicit();
}

/// Determine the linkage and visibility of this type.
LinkageInfo getLinkageAndVisibility() const;

/// True if the computed linkage is valid. Used for consistency
/// checking. Should always return true.
bool isLinkageValid() const;

/// Determine the nullability of the given type.
///
/// Note that nullability is only captured as sugar within the type
/// system, not as part of the canonical type, so nullability will
/// be lost by canonicalization and desugaring.
Optional<NullabilityKind> getNullability(const ASTContext &context) const;

/// Determine whether the given type can have a nullability
/// specifier applied to it, i.e., if it is any kind of pointer type.
///
/// \param ResultIfUnknown The value to return if we don't yet know whether
///        this type can have nullability because it is dependent.
bool canHaveNullability(bool ResultIfUnknown = true) const;

/// Retrieve the set of substitutions required when accessing a member
/// of the Objective-C receiver type that is declared in the given context.
///
/// \c *this is the type of the object we're operating on, e.g., the
/// receiver for a message send or the base of a property access, and is
/// expected to be of some object or object pointer type.
///
/// \param dc The declaration context for which we are building up a
/// substitution mapping, which should be an Objective-C class, extension,
/// category, or method within.
///
/// \returns an array of type arguments that can be substituted for
/// the type parameters of the given declaration context in any type described
/// within that context, or an empty optional to indicate that no
/// substitution is required.
Optional<ArrayRef<QualType>>
getObjCSubstitutions(const DeclContext *dc) const;

/// Determines if this is an ObjC interface type that may accept type
/// parameters.
bool acceptsObjCTypeParams() const;

const char *getTypeClassName() const;

QualType getCanonicalTypeInternal() const {
  return CanonicalType;
}

CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h
void dump() const;
void dump(llvm::raw_ostream &OS) const;
2397};

2399/// This will check for a TypedefType by removing any existing sugar
2400/// until it reaches a TypedefType or a non-sugared type.
2401template <> const TypedefType *Type::getAs() const;

2403/// This will check for a TemplateSpecializationType by removing any
2404/// existing sugar until it reaches a TemplateSpecializationType or a
2405/// non-sugared type.
2406template <> const TemplateSpecializationType *Type::getAs() const;

2408/// This will check for an AttributedType by removing any existing sugar
2409/// until it reaches an AttributedType or a non-sugared type.
2410template <> const AttributedType *Type::getAs() const;

2412// We can do canonical leaf types faster, because we don't have to
2413// worry about preserving child type decoration.
2414#define TYPE(Class, Base)
2415#define LEAF_TYPE(Class) \
2416template <> inline const Class##Type *Type::getAs() const { \
return dyn_cast<Class##Type>(CanonicalType); \
2418} \
2419template <> inline const Class##Type *Type::castAs() const { \
return cast<Class##Type>(CanonicalType); \
2421}
2422#include "clang/AST/TypeNodes.inc"

2424/// This class is used for builtin types like 'int'.  Builtin
2425/// types are always canonical and have a literal name field.
2426class BuiltinType : public Type {
2427public:
enum Kind {
2429// OpenCL image types
2430#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) Id,
2431#include "clang/Basic/OpenCLImageTypes.def"
2432// OpenCL extension types
2433#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) Id,
2434#include "clang/Basic/OpenCLExtensionTypes.def"
2435// SVE Types
2436#define SVE_TYPE(Name, Id, SingletonId) Id,
2437#include "clang/Basic/AArch64SVEACLETypes.def"
2438// All other builtin types
2439#define BUILTIN_TYPE(Id, SingletonId) Id,
2440#define LAST_BUILTIN_TYPE(Id) LastKind = Id
2441#include "clang/AST/BuiltinTypes.def"
};

2444private:
friend class ASTContext; // ASTContext creates these.

BuiltinType(Kind K)
    : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent),
           /*InstantiationDependent=*/(K == Dependent),
           /*VariablyModified=*/false,
           /*Unexpanded parameter pack=*/false) {
  BuiltinTypeBits.Kind = K;
}

2455public:
Kind getKind() const { return static_cast<Kind>(BuiltinTypeBits.Kind); }
StringRef getName(const PrintingPolicy &Policy) const;

const char *getNameAsCString(const PrintingPolicy &Policy) const {
  // The StringRef is null-terminated.
  StringRef str = getName(Policy);
  assert(!str.empty() && str.data()[str.size()] == '\0')((!str.empty() && str.data()[str.size()] == '\0') ? static_cast
<void> (0) : __assert_fail ("!str.empty() && str.data()[str.size()] == '\\0'"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 2462, __PRETTY_FUNCTION__));
  return str.data();
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

bool isInteger() const {
  return getKind() >= Bool && getKind() <= Int128;
}

bool isSignedInteger() const {
  return getKind() >= Char_S && getKind() <= Int128;
}

bool isUnsignedInteger() const {
  return getKind() >= Bool && getKind() <= UInt128;
}

bool isFloatingPoint() const {
  return getKind() >= Half && getKind() <= Float128;
}

/// Determines whether the given kind corresponds to a placeholder type.
static bool isPlaceholderTypeKind(Kind K) {
  return K >= Overload;
}

/// Determines whether this type is a placeholder type, i.e. a type
/// which cannot appear in arbitrary positions in a fully-formed
/// expression.
bool isPlaceholderType() const {
  return isPlaceholderTypeKind(getKind());
}

/// Determines whether this type is a placeholder type other than
/// Overload.  Most placeholder types require only syntactic
/// information about their context in order to be resolved (e.g.
/// whether it is a call expression), which means they can (and
/// should) be resolved in an earlier "phase" of analysis.
/// Overload expressions sometimes pick up further information
/// from their context, like whether the context expects a
/// specific function-pointer type, and so frequently need
/// special treatment.
bool isNonOverloadPlaceholderType() const {
  return getKind() > Overload;
}

static bool classof(const Type *T) { return T->getTypeClass() == Builtin; }
2511};

2513/// Complex values, per C99 6.2.5p11.  This supports the C99 complex
2514/// types (_Complex float etc) as well as the GCC integer complex extensions.
2515class ComplexType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType ElementType;

ComplexType(QualType Element, QualType CanonicalPtr)
    : Type(Complex, CanonicalPtr, Element->isDependentType(),
           Element->isInstantiationDependentType(),
           Element->isVariablyModifiedType(),
           Element->containsUnexpandedParameterPack()),
      ElementType(Element) {}

2527public:
QualType getElementType() const { return ElementType; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getElementType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) {
  ID.AddPointer(Element.getAsOpaquePtr());
}

static bool classof(const Type *T) { return T->getTypeClass() == Complex; }
2542};

2544/// Sugar for parentheses used when specifying types.
2545class ParenType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType Inner;

ParenType(QualType InnerType, QualType CanonType)
    : Type(Paren, CanonType, InnerType->isDependentType(),
           InnerType->isInstantiationDependentType(),
           InnerType->isVariablyModifiedType(),
           InnerType->containsUnexpandedParameterPack()),
      Inner(InnerType) {}

2557public:
QualType getInnerType() const { return Inner; }

bool isSugared() const { return true; }
QualType desugar() const { return getInnerType(); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getInnerType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Inner) {
  Inner.Profile(ID);
}

static bool classof(const Type *T) { return T->getTypeClass() == Paren; }
2572};

2574/// PointerType - C99 6.7.5.1 - Pointer Declarators.
2575class PointerType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType PointeeType;

PointerType(QualType Pointee, QualType CanonicalPtr)
    : Type(Pointer, CanonicalPtr, Pointee->isDependentType(),
           Pointee->isInstantiationDependentType(),
           Pointee->isVariablyModifiedType(),
           Pointee->containsUnexpandedParameterPack()),
      PointeeType(Pointee) {}

2587public:
QualType getPointeeType() const { return PointeeType; }

/// Returns true if address spaces of pointers overlap.
/// OpenCL v2.0 defines conversion rules for pointers to different
/// address spaces (OpenCLC v2.0 s6.5.5) and notion of overlapping
/// address spaces.
/// CL1.1 or CL1.2:
///   address spaces overlap iff they are they same.
/// CL2.0 adds:
///   __generic overlaps with any address space except for __constant.
bool isAddressSpaceOverlapping(const PointerType &other) const {
  Qualifiers thisQuals = PointeeType.getQualifiers();
  Qualifiers otherQuals = other.getPointeeType().getQualifiers();
  // Address spaces overlap if at least one of them is a superset of another
  return thisQuals.isAddressSpaceSupersetOf(otherQuals) ||
         otherQuals.isAddressSpaceSupersetOf(thisQuals);
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getPointeeType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
  ID.AddPointer(Pointee.getAsOpaquePtr());
}

static bool classof(const Type *T) { return T->getTypeClass() == Pointer; }
2618};

2620/// Represents a type which was implicitly adjusted by the semantic
2621/// engine for arbitrary reasons.  For example, array and function types can
2622/// decay, and function types can have their calling conventions adjusted.
2623class AdjustedType : public Type, public llvm::FoldingSetNode {
QualType OriginalTy;
QualType AdjustedTy;

2627protected:
friend class ASTContext; // ASTContext creates these.

AdjustedType(TypeClass TC, QualType OriginalTy, QualType AdjustedTy,
             QualType CanonicalPtr)
    : Type(TC, CanonicalPtr, OriginalTy->isDependentType(),
           OriginalTy->isInstantiationDependentType(),
           OriginalTy->isVariablyModifiedType(),
           OriginalTy->containsUnexpandedParameterPack()),
      OriginalTy(OriginalTy), AdjustedTy(AdjustedTy) {}

2638public:
QualType getOriginalType() const { return OriginalTy; }
QualType getAdjustedType() const { return AdjustedTy; }

bool isSugared() const { return true; }
QualType desugar() const { return AdjustedTy; }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, OriginalTy, AdjustedTy);
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Orig, QualType New) {
  ID.AddPointer(Orig.getAsOpaquePtr());
  ID.AddPointer(New.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Adjusted || T->getTypeClass() == Decayed;
}
2657};

2659/// Represents a pointer type decayed from an array or function type.
2660class DecayedType : public AdjustedType {
friend class ASTContext; // ASTContext creates these.

inline
DecayedType(QualType OriginalType, QualType Decayed, QualType Canonical);

2666public:
QualType getDecayedType() const { return getAdjustedType(); }

inline QualType getPointeeType() const;

static bool classof(const Type *T) { return T->getTypeClass() == Decayed; }
2672};

2674/// Pointer to a block type.
2675/// This type is to represent types syntactically represented as
2676/// "void (^)(int)", etc. Pointee is required to always be a function type.
2677class BlockPointerType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

// Block is some kind of pointer type
QualType PointeeType;

BlockPointerType(QualType Pointee, QualType CanonicalCls)
    : Type(BlockPointer, CanonicalCls, Pointee->isDependentType(),
           Pointee->isInstantiationDependentType(),
           Pointee->isVariablyModifiedType(),
           Pointee->containsUnexpandedParameterPack()),
      PointeeType(Pointee) {}

2690public:
// Get the pointee type. Pointee is required to always be a function type.
QualType getPointeeType() const { return PointeeType; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
    Profile(ID, getPointeeType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
    ID.AddPointer(Pointee.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == BlockPointer;
}
2708};

2710/// Base for LValueReferenceType and RValueReferenceType
2711class ReferenceType : public Type, public llvm::FoldingSetNode {
QualType PointeeType;

2714protected:
ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef,
              bool SpelledAsLValue)
    : Type(tc, CanonicalRef, Referencee->isDependentType(),
           Referencee->isInstantiationDependentType(),
           Referencee->isVariablyModifiedType(),
           Referencee->containsUnexpandedParameterPack()),
      PointeeType(Referencee) {
  ReferenceTypeBits.SpelledAsLValue = SpelledAsLValue;
  ReferenceTypeBits.InnerRef = Referencee->isReferenceType();
}

2726public:
bool isSpelledAsLValue() const { return ReferenceTypeBits.SpelledAsLValue; }
bool isInnerRef() const { return ReferenceTypeBits.InnerRef; }

QualType getPointeeTypeAsWritten() const { return PointeeType; }

QualType getPointeeType() const {
  // FIXME: this might strip inner qualifiers; okay?
  const ReferenceType *T = this;
  while (T->isInnerRef())
    T = T->PointeeType->castAs<ReferenceType>();
  return T->PointeeType;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, PointeeType, isSpelledAsLValue());
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    QualType Referencee,
                    bool SpelledAsLValue) {
  ID.AddPointer(Referencee.getAsOpaquePtr());
  ID.AddBoolean(SpelledAsLValue);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == LValueReference ||
         T->getTypeClass() == RValueReference;
}
2755};

2757/// An lvalue reference type, per C++11 [dcl.ref].
2758class LValueReferenceType : public ReferenceType {
friend class ASTContext; // ASTContext creates these

LValueReferenceType(QualType Referencee, QualType CanonicalRef,
                    bool SpelledAsLValue)
    : ReferenceType(LValueReference, Referencee, CanonicalRef,
                    SpelledAsLValue) {}

2766public:
bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == LValueReference;
}
2773};

2775/// An rvalue reference type, per C++11 [dcl.ref].
2776class RValueReferenceType : public ReferenceType {
friend class ASTContext; // ASTContext creates these

RValueReferenceType(QualType Referencee, QualType CanonicalRef)
     : ReferenceType(RValueReference, Referencee, CanonicalRef, false) {}

2782public:
bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == RValueReference;
}
2789};

2791/// A pointer to member type per C++ 8.3.3 - Pointers to members.
2792///
2793/// This includes both pointers to data members and pointer to member functions.
2794class MemberPointerType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType PointeeType;

/// The class of which the pointee is a member. Must ultimately be a
/// RecordType, but could be a typedef or a template parameter too.
const Type *Class;

MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr)
    : Type(MemberPointer, CanonicalPtr,
           Cls->isDependentType() || Pointee->isDependentType(),
           (Cls->isInstantiationDependentType() ||
            Pointee->isInstantiationDependentType()),
           Pointee->isVariablyModifiedType(),
           (Cls->containsUnexpandedParameterPack() ||
            Pointee->containsUnexpandedParameterPack())),
           PointeeType(Pointee), Class(Cls) {}

2813public:
QualType getPointeeType() const { return PointeeType; }

/// Returns true if the member type (i.e. the pointee type) is a
/// function type rather than a data-member type.
bool isMemberFunctionPointer() const {
  return PointeeType->isFunctionProtoType();
}

/// Returns true if the member type (i.e. the pointee type) is a
/// data type rather than a function type.
bool isMemberDataPointer() const {
  return !PointeeType->isFunctionProtoType();
}

const Type *getClass() const { return Class; }
CXXRecordDecl *getMostRecentCXXRecordDecl() const;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getPointeeType(), getClass());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee,
                    const Type *Class) {
  ID.AddPointer(Pointee.getAsOpaquePtr());
  ID.AddPointer(Class);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == MemberPointer;
}
2847};

2849/// Represents an array type, per C99 6.7.5.2 - Array Declarators.
2850class ArrayType : public Type, public llvm::FoldingSetNode {
2851public:
/// Capture whether this is a normal array (e.g. int X[4])
/// an array with a static size (e.g. int X[static 4]), or an array
/// with a star size (e.g. int X[*]).
/// 'static' is only allowed on function parameters.
enum ArraySizeModifier {
  Normal, Static, Star
};

2860private:
/// The element type of the array.
QualType ElementType;

2864protected:
friend class ASTContext; // ASTContext creates these.

// C++ [temp.dep.type]p1:
//   A type is dependent if it is...
//     - an array type constructed from any dependent type or whose
//       size is specified by a constant expression that is
//       value-dependent,
ArrayType(TypeClass tc, QualType et, QualType can,
          ArraySizeModifier sm, unsigned tq,
          bool ContainsUnexpandedParameterPack)
    : Type(tc, can, et->isDependentType() || tc == DependentSizedArray,
           et->isInstantiationDependentType() || tc == DependentSizedArray,
           (tc == VariableArray || et->isVariablyModifiedType()),
           ContainsUnexpandedParameterPack),
      ElementType(et) {
  ArrayTypeBits.IndexTypeQuals = tq;
  ArrayTypeBits.SizeModifier = sm;
}

2884public:
QualType getElementType() const { return ElementType; }

ArraySizeModifier getSizeModifier() const {
  return ArraySizeModifier(ArrayTypeBits.SizeModifier);
}

Qualifiers getIndexTypeQualifiers() const {
  return Qualifiers::fromCVRMask(getIndexTypeCVRQualifiers());
}

unsigned getIndexTypeCVRQualifiers() const {
  return ArrayTypeBits.IndexTypeQuals;
}

static bool classof(const Type *T) {
  return T->getTypeClass() == ConstantArray ||
         T->getTypeClass() == VariableArray ||
         T->getTypeClass() == IncompleteArray ||
         T->getTypeClass() == DependentSizedArray;
}
2905};

2907/// Represents the canonical version of C arrays with a specified constant size.
2908/// For example, the canonical type for 'int A[4 + 4*100]' is a
2909/// ConstantArrayType where the element type is 'int' and the size is 404.
2910class ConstantArrayType : public ArrayType {
llvm::APInt Size; // Allows us to unique the type.

ConstantArrayType(QualType et, QualType can, const llvm::APInt &size,
                  ArraySizeModifier sm, unsigned tq)
    : ArrayType(ConstantArray, et, can, sm, tq,
                et->containsUnexpandedParameterPack()),
      Size(size) {}

2919protected:
friend class ASTContext; // ASTContext creates these.

ConstantArrayType(TypeClass tc, QualType et, QualType can,
                  const llvm::APInt &size, ArraySizeModifier sm, unsigned tq)
    : ArrayType(tc, et, can, sm, tq, et->containsUnexpandedParameterPack()),
      Size(size) {}

2927public:
const llvm::APInt &getSize() const { return Size; }
bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

/// Determine the number of bits required to address a member of
// an array with the given element type and number of elements.
static unsigned getNumAddressingBits(const ASTContext &Context,
                                     QualType ElementType,
                                     const llvm::APInt &NumElements);

/// Determine the maximum number of active bits that an array's size
/// can require, which limits the maximum size of the array.
static unsigned getMaxSizeBits(const ASTContext &Context);

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getElementType(), getSize(),
          getSizeModifier(), getIndexTypeCVRQualifiers());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType ET,
                    const llvm::APInt &ArraySize, ArraySizeModifier SizeMod,
                    unsigned TypeQuals) {
  ID.AddPointer(ET.getAsOpaquePtr());
  ID.AddInteger(ArraySize.getZExtValue());
  ID.AddInteger(SizeMod);
  ID.AddInteger(TypeQuals);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == ConstantArray;
}
2959};

2961/// Represents a C array with an unspecified size.  For example 'int A[]' has
2962/// an IncompleteArrayType where the element type is 'int' and the size is
2963/// unspecified.
2964class IncompleteArrayType : public ArrayType {
friend class ASTContext; // ASTContext creates these.

IncompleteArrayType(QualType et, QualType can,
                    ArraySizeModifier sm, unsigned tq)
    : ArrayType(IncompleteArray, et, can, sm, tq,
                et->containsUnexpandedParameterPack()) {}

2972public:
friend class StmtIteratorBase;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == IncompleteArray;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getElementType(), getSizeModifier(),
          getIndexTypeCVRQualifiers());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType ET,
                    ArraySizeModifier SizeMod, unsigned TypeQuals) {
  ID.AddPointer(ET.getAsOpaquePtr());
  ID.AddInteger(SizeMod);
  ID.AddInteger(TypeQuals);
}
2993};

2995/// Represents a C array with a specified size that is not an
2996/// integer-constant-expression.  For example, 'int s[x+foo()]'.
2997/// Since the size expression is an arbitrary expression, we store it as such.
2998///
2999/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and
3000/// should not be: two lexically equivalent variable array types could mean
3001/// different things, for example, these variables do not have the same type
3002/// dynamically:
3003///
3004/// void foo(int x) {
3005///   int Y[x];
3006///   ++x;
3007///   int Z[x];
3008/// }
3009class VariableArrayType : public ArrayType {
friend class ASTContext; // ASTContext creates these.

/// An assignment-expression. VLA's are only permitted within
/// a function block.
Stmt *SizeExpr;

/// The range spanned by the left and right array brackets.
SourceRange Brackets;

VariableArrayType(QualType et, QualType can, Expr *e,
                  ArraySizeModifier sm, unsigned tq,
                  SourceRange brackets)
    : ArrayType(VariableArray, et, can, sm, tq,
                et->containsUnexpandedParameterPack()),
      SizeExpr((Stmt*) e), Brackets(brackets) {}

3026public:
friend class StmtIteratorBase;

Expr *getSizeExpr() const {
  // We use C-style casts instead of cast<> here because we do not wish
  // to have a dependency of Type.h on Stmt.h/Expr.h.
  return (Expr*) SizeExpr;
}

SourceRange getBracketsRange() const { return Brackets; }
SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == VariableArray;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  llvm_unreachable("Cannot unique VariableArrayTypes.")::llvm::llvm_unreachable_internal("Cannot unique VariableArrayTypes."
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3047);
}
3049};

3051/// Represents an array type in C++ whose size is a value-dependent expression.
3052///
3053/// For example:
3054/// \code
3055/// template<typename T, int Size>
3056/// class array {
3057///   T data[Size];
3058/// };
3059/// \endcode
3060///
3061/// For these types, we won't actually know what the array bound is
3062/// until template instantiation occurs, at which point this will
3063/// become either a ConstantArrayType or a VariableArrayType.
3064class DependentSizedArrayType : public ArrayType {
friend class ASTContext; // ASTContext creates these.

const ASTContext &Context;

/// An assignment expression that will instantiate to the
/// size of the array.
///
/// The expression itself might be null, in which case the array
/// type will have its size deduced from an initializer.
Stmt *SizeExpr;

/// The range spanned by the left and right array brackets.
SourceRange Brackets;

DependentSizedArrayType(const ASTContext &Context, QualType et, QualType can,
                        Expr *e, ArraySizeModifier sm, unsigned tq,
                        SourceRange brackets);

3083public:
friend class StmtIteratorBase;

Expr *getSizeExpr() const {
  // We use C-style casts instead of cast<> here because we do not wish
  // to have a dependency of Type.h on Stmt.h/Expr.h.
  return (Expr*) SizeExpr;
}

SourceRange getBracketsRange() const { return Brackets; }
SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentSizedArray;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getElementType(),
          getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    QualType ET, ArraySizeModifier SizeMod,
                    unsigned TypeQuals, Expr *E);
3111};

3113/// Represents an extended address space qualifier where the input address space
3114/// value is dependent. Non-dependent address spaces are not represented with a
3115/// special Type subclass; they are stored on an ExtQuals node as part of a QualType.
3116///
3117/// For example:
3118/// \code
3119/// template<typename T, int AddrSpace>
3120/// class AddressSpace {
3121///   typedef T __attribute__((address_space(AddrSpace))) type;
3122/// }
3123/// \endcode
3124class DependentAddressSpaceType : public Type, public llvm::FoldingSetNode {
friend class ASTContext;

const ASTContext &Context;
Expr *AddrSpaceExpr;
QualType PointeeType;
SourceLocation loc;

DependentAddressSpaceType(const ASTContext &Context, QualType PointeeType,
                          QualType can, Expr *AddrSpaceExpr,
                          SourceLocation loc);

3136public:
Expr *getAddrSpaceExpr() const { return AddrSpaceExpr; }
QualType getPointeeType() const { return PointeeType; }
SourceLocation getAttributeLoc() const { return loc; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentAddressSpace;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getPointeeType(), getAddrSpaceExpr());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    QualType PointeeType, Expr *AddrSpaceExpr);
3154};

3156/// Represents an extended vector type where either the type or size is
3157/// dependent.
3158///
3159/// For example:
3160/// \code
3161/// template<typename T, int Size>
3162/// class vector {
3163///   typedef T __attribute__((ext_vector_type(Size))) type;
3164/// }
3165/// \endcode
3166class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode {
friend class ASTContext;

const ASTContext &Context;
Expr *SizeExpr;

/// The element type of the array.
QualType ElementType;

SourceLocation loc;

DependentSizedExtVectorType(const ASTContext &Context, QualType ElementType,
                            QualType can, Expr *SizeExpr, SourceLocation loc);

3180public:
Expr *getSizeExpr() const { return SizeExpr; }
QualType getElementType() const { return ElementType; }
SourceLocation getAttributeLoc() const { return loc; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentSizedExtVector;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getElementType(), getSizeExpr());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    QualType ElementType, Expr *SizeExpr);
3198};


3201/// Represents a GCC generic vector type. This type is created using
3202/// __attribute__((vector_size(n)), where "n" specifies the vector size in
3203/// bytes; or from an Altivec __vector or vector declaration.
3204/// Since the constructor takes the number of vector elements, the
3205/// client is responsible for converting the size into the number of elements.
3206class VectorType : public Type, public llvm::FoldingSetNode {
3207public:
enum VectorKind {
  /// not a target-specific vector type
  GenericVector,

  /// is AltiVec vector
  AltiVecVector,

  /// is AltiVec 'vector Pixel'
  AltiVecPixel,

  /// is AltiVec 'vector bool ...'
  AltiVecBool,

  /// is ARM Neon vector
  NeonVector,

  /// is ARM Neon polynomial vector
  NeonPolyVector
};

3228protected:
friend class ASTContext; // ASTContext creates these.

/// The element type of the vector.
QualType ElementType;

VectorType(QualType vecType, unsigned nElements, QualType canonType,
           VectorKind vecKind);

VectorType(TypeClass tc, QualType vecType, unsigned nElements,
           QualType canonType, VectorKind vecKind);

3240public:
QualType getElementType() const { return ElementType; }
unsigned getNumElements() const { return VectorTypeBits.NumElements; }

static bool isVectorSizeTooLarge(unsigned NumElements) {
  return NumElements > VectorTypeBitfields::MaxNumElements;
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

VectorKind getVectorKind() const {
  return VectorKind(VectorTypeBits.VecKind);
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getElementType(), getNumElements(),
          getTypeClass(), getVectorKind());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType,
                    unsigned NumElements, TypeClass TypeClass,
                    VectorKind VecKind) {
  ID.AddPointer(ElementType.getAsOpaquePtr());
  ID.AddInteger(NumElements);
  ID.AddInteger(TypeClass);
  ID.AddInteger(VecKind);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector;
}
3272};

3274/// Represents a vector type where either the type or size is dependent.
3275////
3276/// For example:
3277/// \code
3278/// template<typename T, int Size>
3279/// class vector {
3280///   typedef T __attribute__((vector_size(Size))) type;
3281/// }
3282/// \endcode
3283class DependentVectorType : public Type, public llvm::FoldingSetNode {
friend class ASTContext;

const ASTContext &Context;
QualType ElementType;
Expr *SizeExpr;
SourceLocation Loc;

DependentVectorType(const ASTContext &Context, QualType ElementType,
                         QualType CanonType, Expr *SizeExpr,
                         SourceLocation Loc, VectorType::VectorKind vecKind);

3295public:
Expr *getSizeExpr() const { return SizeExpr; }
QualType getElementType() const { return ElementType; }
SourceLocation getAttributeLoc() const { return Loc; }
VectorType::VectorKind getVectorKind() const {
  return VectorType::VectorKind(VectorTypeBits.VecKind);
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentVector;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getElementType(), getSizeExpr(), getVectorKind());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    QualType ElementType, const Expr *SizeExpr,
                    VectorType::VectorKind VecKind);
3317};

3319/// ExtVectorType - Extended vector type. This type is created using
3320/// __attribute__((ext_vector_type(n)), where "n" is the number of elements.
3321/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This
3322/// class enables syntactic extensions, like Vector Components for accessing
3323/// points (as .xyzw), colors (as .rgba), and textures (modeled after OpenGL
3324/// Shading Language).
3325class ExtVectorType : public VectorType {
friend class ASTContext; // ASTContext creates these.

ExtVectorType(QualType vecType, unsigned nElements, QualType canonType)
    : VectorType(ExtVector, vecType, nElements, canonType, GenericVector) {}

3331public:
static int getPointAccessorIdx(char c) {
  switch (c) {
  default: return -1;
  case 'x': case 'r': return 0;
  case 'y': case 'g': return 1;
  case 'z': case 'b': return 2;
  case 'w': case 'a': return 3;
  }
}

static int getNumericAccessorIdx(char c) {
  switch (c) {
    default: return -1;
    case '0': return 0;
    case '1': return 1;
    case '2': return 2;
    case '3': return 3;
    case '4': return 4;
    case '5': return 5;
    case '6': return 6;
    case '7': return 7;
    case '8': return 8;
    case '9': return 9;
    case 'A':
    case 'a': return 10;
    case 'B':
    case 'b': return 11;
    case 'C':
    case 'c': return 12;
    case 'D':
    case 'd': return 13;
    case 'E':
    case 'e': return 14;
    case 'F':
    case 'f': return 15;
  }
}

static int getAccessorIdx(char c, bool isNumericAccessor) {
  if (isNumericAccessor)
    return getNumericAccessorIdx(c);
  else
    return getPointAccessorIdx(c);
}

bool isAccessorWithinNumElements(char c, bool isNumericAccessor) const {
  if (int idx = getAccessorIdx(c, isNumericAccessor)+1)
    return unsigned(idx-1) < getNumElements();
  return false;
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == ExtVector;
}
3389};

3391/// FunctionType - C99 6.7.5.3 - Function Declarators.  This is the common base
3392/// class of FunctionNoProtoType and FunctionProtoType.
3393class FunctionType : public Type {
// The type returned by the function.
QualType ResultType;

3397public:
/// Interesting information about a specific parameter that can't simply
/// be reflected in parameter's type. This is only used by FunctionProtoType
/// but is in FunctionType to make this class available during the
/// specification of the bases of FunctionProtoType.
///
/// It makes sense to model language features this way when there's some
/// sort of parameter-specific override (such as an attribute) that
/// affects how the function is called.  For example, the ARC ns_consumed
/// attribute changes whether a parameter is passed at +0 (the default)
/// or +1 (ns_consumed).  This must be reflected in the function type,
/// but isn't really a change to the parameter type.
///
/// One serious disadvantage of modelling language features this way is
/// that they generally do not work with language features that attempt
/// to destructure types.  For example, template argument deduction will
/// not be able to match a parameter declared as
///   T (*)(U)
/// against an argument of type
///   void (*)(__attribute__((ns_consumed)) id)
/// because the substitution of T=void, U=id into the former will
/// not produce the latter.
class ExtParameterInfo {
  enum {
    ABIMask = 0x0F,
    IsConsumed = 0x10,
    HasPassObjSize = 0x20,
    IsNoEscape = 0x40,
  };
  unsigned char Data = 0;

public:
  ExtParameterInfo() = default;

  /// Return the ABI treatment of this parameter.
  ParameterABI getABI() const { return ParameterABI(Data & ABIMask); }
  ExtParameterInfo withABI(ParameterABI kind) const {
    ExtParameterInfo copy = *this;
    copy.Data = (copy.Data & ~ABIMask) | unsigned(kind);
    return copy;
  }

  /// Is this parameter considered "consumed" by Objective-C ARC?
  /// Consumed parameters must have retainable object type.
  bool isConsumed() const { return (Data & IsConsumed); }
  ExtParameterInfo withIsConsumed(bool consumed) const {
    ExtParameterInfo copy = *this;
    if (consumed)
      copy.Data |= IsConsumed;
    else
      copy.Data &= ~IsConsumed;
    return copy;
  }

  bool hasPassObjectSize() const { return Data & HasPassObjSize; }
  ExtParameterInfo withHasPassObjectSize() const {
    ExtParameterInfo Copy = *this;
    Copy.Data |= HasPassObjSize;
    return Copy;
  }

  bool isNoEscape() const { return Data & IsNoEscape; }
  ExtParameterInfo withIsNoEscape(bool NoEscape) const {
    ExtParameterInfo Copy = *this;
    if (NoEscape)
      Copy.Data |= IsNoEscape;
    else
      Copy.Data &= ~IsNoEscape;
    return Copy;
  }

  unsigned char getOpaqueValue() const { return Data; }
  static ExtParameterInfo getFromOpaqueValue(unsigned char data) {
    ExtParameterInfo result;
    result.Data = data;
    return result;
  }

  friend bool operator==(ExtParameterInfo lhs, ExtParameterInfo rhs) {
    return lhs.Data == rhs.Data;
  }

  friend bool operator!=(ExtParameterInfo lhs, ExtParameterInfo rhs) {
    return lhs.Data != rhs.Data;
  }
};

/// A class which abstracts out some details necessary for
/// making a call.
///
/// It is not actually used directly for storing this information in
/// a FunctionType, although FunctionType does currently use the
/// same bit-pattern.
///
// If you add a field (say Foo), other than the obvious places (both,
// constructors, compile failures), what you need to update is
// * Operator==
// * getFoo
// * withFoo
// * functionType. Add Foo, getFoo.
// * ASTContext::getFooType
// * ASTContext::mergeFunctionTypes
// * FunctionNoProtoType::Profile
// * FunctionProtoType::Profile
// * TypePrinter::PrintFunctionProto
// * AST read and write
// * Codegen
class ExtInfo {
  friend class FunctionType;

  // Feel free to rearrange or add bits, but if you go over 12,
  // you'll need to adjust both the Bits field below and
  // Type::FunctionTypeBitfields.

  //   |  CC  |noreturn|produces|nocallersavedregs|regparm|nocfcheck|
  //   |0 .. 4|   5    |    6   |       7         |8 .. 10|    11   |
  //
  // regparm is either 0 (no regparm attribute) or the regparm value+1.
  enum { CallConvMask = 0x1F };
  enum { NoReturnMask = 0x20 };
  enum { ProducesResultMask = 0x40 };
  enum { NoCallerSavedRegsMask = 0x80 };
  enum { NoCfCheckMask = 0x800 };
  enum {
    RegParmMask = ~(CallConvMask | NoReturnMask | ProducesResultMask |
                    NoCallerSavedRegsMask | NoCfCheckMask),
    RegParmOffset = 8
  }; // Assumed to be the last field
  uint16_t Bits = CC_C;

  ExtInfo(unsigned Bits) : Bits(static_cast<uint16_t>(Bits)) {}

 public:
   // Constructor with no defaults. Use this when you know that you
   // have all the elements (when reading an AST file for example).
   ExtInfo(bool noReturn, bool hasRegParm, unsigned regParm, CallingConv cc,
           bool producesResult, bool noCallerSavedRegs, bool NoCfCheck) {
     assert((!hasRegParm || regParm < 7) && "Invalid regparm value")(((!hasRegParm || regParm < 7) && "Invalid regparm value"
) ? static_cast<void> (0) : __assert_fail ("(!hasRegParm || regParm < 7) && \"Invalid regparm value\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3534, __PRETTY_FUNCTION__));
     Bits = ((unsigned)cc) | (noReturn ? NoReturnMask : 0) |
            (producesResult ? ProducesResultMask : 0) |
            (noCallerSavedRegs ? NoCallerSavedRegsMask : 0) |
            (hasRegParm ? ((regParm + 1) << RegParmOffset) : 0) |
            (NoCfCheck ? NoCfCheckMask : 0);
  }

  // Constructor with all defaults. Use when for example creating a
  // function known to use defaults.
  ExtInfo() = default;

  // Constructor with just the calling convention, which is an important part
  // of the canonical type.
  ExtInfo(CallingConv CC) : Bits(CC) {}

  bool getNoReturn() const { return Bits & NoReturnMask; }
  bool getProducesResult() const { return Bits & ProducesResultMask; }
  bool getNoCallerSavedRegs() const { return Bits & NoCallerSavedRegsMask; }
  bool getNoCfCheck() const { return Bits & NoCfCheckMask; }
  bool getHasRegParm() const { return (Bits >> RegParmOffset) != 0; }

  unsigned getRegParm() const {
    unsigned RegParm = (Bits & RegParmMask) >> RegParmOffset;
    if (RegParm > 0)
      --RegParm;
    return RegParm;
  }

  CallingConv getCC() const { return CallingConv(Bits & CallConvMask); }

  bool operator==(ExtInfo Other) const {
    return Bits == Other.Bits;
  }
  bool operator!=(ExtInfo Other) const {
    return Bits != Other.Bits;
  }

  // Note that we don't have setters. That is by design, use
  // the following with methods instead of mutating these objects.

  ExtInfo withNoReturn(bool noReturn) const {
    if (noReturn)
      return ExtInfo(Bits | NoReturnMask);
    else
      return ExtInfo(Bits & ~NoReturnMask);
  }

  ExtInfo withProducesResult(bool producesResult) const {
    if (producesResult)
      return ExtInfo(Bits | ProducesResultMask);
    else
      return ExtInfo(Bits & ~ProducesResultMask);
  }

  ExtInfo withNoCallerSavedRegs(bool noCallerSavedRegs) const {
    if (noCallerSavedRegs)
      return ExtInfo(Bits | NoCallerSavedRegsMask);
    else
      return ExtInfo(Bits & ~NoCallerSavedRegsMask);
  }

  ExtInfo withNoCfCheck(bool noCfCheck) const {
    if (noCfCheck)
      return ExtInfo(Bits | NoCfCheckMask);
    else
      return ExtInfo(Bits & ~NoCfCheckMask);
  }

  ExtInfo withRegParm(unsigned RegParm) const {
    assert(RegParm < 7 && "Invalid regparm value")((RegParm < 7 && "Invalid regparm value") ? static_cast
<void> (0) : __assert_fail ("RegParm < 7 && \"Invalid regparm value\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3604, __PRETTY_FUNCTION__));
    return ExtInfo((Bits & ~RegParmMask) |
                   ((RegParm + 1) << RegParmOffset));
  }

  ExtInfo withCallingConv(CallingConv cc) const {
    return ExtInfo((Bits & ~CallConvMask) | (unsigned) cc);
  }

  void Profile(llvm::FoldingSetNodeID &ID) const {
    ID.AddInteger(Bits);
  }
};

/// A simple holder for a QualType representing a type in an
/// exception specification. Unfortunately needed by FunctionProtoType
/// because TrailingObjects cannot handle repeated types.
struct ExceptionType { QualType Type; };

/// A simple holder for various uncommon bits which do not fit in
/// FunctionTypeBitfields. Aligned to alignof(void *) to maintain the
/// alignment of subsequent objects in TrailingObjects. You must update
/// hasExtraBitfields in FunctionProtoType after adding extra data here.
struct alignas(void *) FunctionTypeExtraBitfields {
  /// The number of types in the exception specification.
  /// A whole unsigned is not needed here and according to
  /// [implimits] 8 bits would be enough here.
  unsigned NumExceptionType;
};

3634protected:
FunctionType(TypeClass tc, QualType res,
             QualType Canonical, bool Dependent,
             bool InstantiationDependent,
             bool VariablyModified, bool ContainsUnexpandedParameterPack,
             ExtInfo Info)
    : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
           ContainsUnexpandedParameterPack),
      ResultType(res) {
  FunctionTypeBits.ExtInfo = Info.Bits;
}

Qualifiers getFastTypeQuals() const {
  return Qualifiers::fromFastMask(FunctionTypeBits.FastTypeQuals);
}

3650public:
QualType getReturnType() const { return ResultType; }

bool getHasRegParm() const { return getExtInfo().getHasRegParm(); }
unsigned getRegParmType() const { return getExtInfo().getRegParm(); }

/// Determine whether this function type includes the GNU noreturn
/// attribute. The C++11 [[noreturn]] attribute does not affect the function
/// type.
bool getNoReturnAttr() const { return getExtInfo().getNoReturn(); }

CallingConv getCallConv() const { return getExtInfo().getCC(); }
ExtInfo getExtInfo() const { return ExtInfo(FunctionTypeBits.ExtInfo); }

static_assert((~Qualifiers::FastMask & Qualifiers::CVRMask) == 0,
              "Const, volatile and restrict are assumed to be a subset of "
              "the fast qualifiers.");

bool isConst() const { return getFastTypeQuals().hasConst(); }
bool isVolatile() const { return getFastTypeQuals().hasVolatile(); }
bool isRestrict() const { return getFastTypeQuals().hasRestrict(); }

/// Determine the type of an expression that calls a function of
/// this type.
QualType getCallResultType(const ASTContext &Context) const {
  return getReturnType().getNonLValueExprType(Context);
}

static StringRef getNameForCallConv(CallingConv CC);

static bool classof(const Type *T) {
  return T->getTypeClass() == FunctionNoProto ||
         T->getTypeClass() == FunctionProto;
}
3684};

3686/// Represents a K&R-style 'int foo()' function, which has
3687/// no information available about its arguments.
3688class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

FunctionNoProtoType(QualType Result, QualType Canonical, ExtInfo Info)
    : FunctionType(FunctionNoProto, Result, Canonical,
                   /*Dependent=*/false, /*InstantiationDependent=*/false,
                   Result->isVariablyModifiedType(),
                   /*ContainsUnexpandedParameterPack=*/false, Info) {}

3697public:
// No additional state past what FunctionType provides.

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getReturnType(), getExtInfo());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType,
                    ExtInfo Info) {
  Info.Profile(ID);
  ID.AddPointer(ResultType.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == FunctionNoProto;
}
3716};

3718/// Represents a prototype with parameter type info, e.g.
3719/// 'int foo(int)' or 'int foo(void)'.  'void' is represented as having no
3720/// parameters, not as having a single void parameter. Such a type can have
3721/// an exception specification, but this specification is not part of the
3722/// canonical type. FunctionProtoType has several trailing objects, some of
3723/// which optional. For more information about the trailing objects see
3724/// the first comment inside FunctionProtoType.
3725class FunctionProtoType final
  : public FunctionType,
    public llvm::FoldingSetNode,
    private llvm::TrailingObjects<
        FunctionProtoType, QualType, FunctionType::FunctionTypeExtraBitfields,
        FunctionType::ExceptionType, Expr *, FunctionDecl *,
        FunctionType::ExtParameterInfo, Qualifiers> {
friend class ASTContext; // ASTContext creates these.
friend TrailingObjects;

// FunctionProtoType is followed by several trailing objects, some of
// which optional. They are in order:
//
// * An array of getNumParams() QualType holding the parameter types.
//   Always present. Note that for the vast majority of FunctionProtoType,
//   these will be the only trailing objects.
//
// * Optionally if some extra data is stored in FunctionTypeExtraBitfields
//   (see FunctionTypeExtraBitfields and FunctionTypeBitfields):
//   a single FunctionTypeExtraBitfields. Present if and only if
//   hasExtraBitfields() is true.
//
// * Optionally exactly one of:
//   * an array of getNumExceptions() ExceptionType,
//   * a single Expr *,
//   * a pair of FunctionDecl *,
//   * a single FunctionDecl *
//   used to store information about the various types of exception
//   specification. See getExceptionSpecSize for the details.
//
// * Optionally an array of getNumParams() ExtParameterInfo holding
//   an ExtParameterInfo for each of the parameters. Present if and
//   only if hasExtParameterInfos() is true.
//
// * Optionally a Qualifiers object to represent extra qualifiers that can't
//   be represented by FunctionTypeBitfields.FastTypeQuals. Present if and only
//   if hasExtQualifiers() is true.
//
// The optional FunctionTypeExtraBitfields has to be before the data
// related to the exception specification since it contains the number
// of exception types.
//
// We put the ExtParameterInfos last.  If all were equal, it would make
// more sense to put these before the exception specification, because
// it's much easier to skip past them compared to the elaborate switch
// required to skip the exception specification.  However, all is not
// equal; ExtParameterInfos are used to model very uncommon features,
// and it's better not to burden the more common paths.

3774public:
/// Holds information about the various types of exception specification.
/// ExceptionSpecInfo is not stored as such in FunctionProtoType but is
/// used to group together the various bits of information about the
/// exception specification.
struct ExceptionSpecInfo {
  /// The kind of exception specification this is.
  ExceptionSpecificationType Type = EST_None;

  /// Explicitly-specified list of exception types.
  ArrayRef<QualType> Exceptions;

  /// Noexcept expression, if this is a computed noexcept specification.
  Expr *NoexceptExpr = nullptr;

  /// The function whose exception specification this is, for
  /// EST_Unevaluated and EST_Uninstantiated.
  FunctionDecl *SourceDecl = nullptr;

  /// The function template whose exception specification this is instantiated
  /// from, for EST_Uninstantiated.
  FunctionDecl *SourceTemplate = nullptr;

  ExceptionSpecInfo() = default;

  ExceptionSpecInfo(ExceptionSpecificationType EST) : Type(EST) {}
};

/// Extra information about a function prototype. ExtProtoInfo is not
/// stored as such in FunctionProtoType but is used to group together
/// the various bits of extra information about a function prototype.
struct ExtProtoInfo {
  FunctionType::ExtInfo ExtInfo;
  bool Variadic : 1;
  bool HasTrailingReturn : 1;
  Qualifiers TypeQuals;
  RefQualifierKind RefQualifier = RQ_None;
  ExceptionSpecInfo ExceptionSpec;
  const ExtParameterInfo *ExtParameterInfos = nullptr;

  ExtProtoInfo() : Variadic(false), HasTrailingReturn(false) {}

  ExtProtoInfo(CallingConv CC)
      : ExtInfo(CC), Variadic(false), HasTrailingReturn(false) {}

  ExtProtoInfo withExceptionSpec(const ExceptionSpecInfo &ESI) {
    ExtProtoInfo Result(*this);
    Result.ExceptionSpec = ESI;
    return Result;
  }
};

3826private:
unsigned numTrailingObjects(OverloadToken<QualType>) const {
  return getNumParams();
}

unsigned numTrailingObjects(OverloadToken<FunctionTypeExtraBitfields>) const {
  return hasExtraBitfields();
}

unsigned numTrailingObjects(OverloadToken<ExceptionType>) const {
  return getExceptionSpecSize().NumExceptionType;
}

unsigned numTrailingObjects(OverloadToken<Expr *>) const {
  return getExceptionSpecSize().NumExprPtr;
}

unsigned numTrailingObjects(OverloadToken<FunctionDecl *>) const {
  return getExceptionSpecSize().NumFunctionDeclPtr;
}

unsigned numTrailingObjects(OverloadToken<ExtParameterInfo>) const {
  return hasExtParameterInfos() ? getNumParams() : 0;
}

/// Determine whether there are any argument types that
/// contain an unexpanded parameter pack.
static bool containsAnyUnexpandedParameterPack(const QualType *ArgArray,
                                               unsigned numArgs) {
  for (unsigned Idx = 0; Idx < numArgs; ++Idx)
    if (ArgArray[Idx]->containsUnexpandedParameterPack())
      return true;

  return false;
}

FunctionProtoType(QualType result, ArrayRef<QualType> params,
                  QualType canonical, const ExtProtoInfo &epi);

/// This struct is returned by getExceptionSpecSize and is used to
/// translate an ExceptionSpecificationType to the number and kind
/// of trailing objects related to the exception specification.
struct ExceptionSpecSizeHolder {
  unsigned NumExceptionType;
  unsigned NumExprPtr;
  unsigned NumFunctionDeclPtr;
};

/// Return the number and kind of trailing objects
/// related to the exception specification.
static ExceptionSpecSizeHolder
getExceptionSpecSize(ExceptionSpecificationType EST, unsigned NumExceptions) {
  switch (EST) {
  case EST_None:
  case EST_DynamicNone:
  case EST_MSAny:
  case EST_BasicNoexcept:
  case EST_Unparsed:
  case EST_NoThrow:
    return {0, 0, 0};

  case EST_Dynamic:
    return {NumExceptions, 0, 0};

  case EST_DependentNoexcept:
  case EST_NoexceptFalse:
  case EST_NoexceptTrue:
    return {0, 1, 0};

  case EST_Uninstantiated:
    return {0, 0, 2};

  case EST_Unevaluated:
    return {0, 0, 1};
  }
  llvm_unreachable("bad exception specification kind")::llvm::llvm_unreachable_internal("bad exception specification kind"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3901);
}

/// Return the number and kind of trailing objects
/// related to the exception specification.
ExceptionSpecSizeHolder getExceptionSpecSize() const {
  return getExceptionSpecSize(getExceptionSpecType(), getNumExceptions());
}

/// Whether the trailing FunctionTypeExtraBitfields is present.
static bool hasExtraBitfields(ExceptionSpecificationType EST) {
  // If the exception spec type is EST_Dynamic then we have > 0 exception
  // types and the exact number is stored in FunctionTypeExtraBitfields.
  return EST == EST_Dynamic;
}

/// Whether the trailing FunctionTypeExtraBitfields is present.
bool hasExtraBitfields() const {
  return hasExtraBitfields(getExceptionSpecType());
}

bool hasExtQualifiers() const {
  return FunctionTypeBits.HasExtQuals;
}

3926public:
unsigned getNumParams() const { return FunctionTypeBits.NumParams; }

QualType getParamType(unsigned i) const {
  assert(i < getNumParams() && "invalid parameter index")((i < getNumParams() && "invalid parameter index")
 ? static_cast<void> (0) : __assert_fail ("i < getNumParams() && \"invalid parameter index\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3930, __PRETTY_FUNCTION__));
  return param_type_begin()[i];
}

ArrayRef<QualType> getParamTypes() const {
  return llvm::makeArrayRef(param_type_begin(), param_type_end());
}

ExtProtoInfo getExtProtoInfo() const {
  ExtProtoInfo EPI;
  EPI.ExtInfo = getExtInfo();
  EPI.Variadic = isVariadic();
  EPI.HasTrailingReturn = hasTrailingReturn();
  EPI.ExceptionSpec.Type = getExceptionSpecType();
  EPI.TypeQuals = getMethodQuals();
  EPI.RefQualifier = getRefQualifier();
  if (EPI.ExceptionSpec.Type == EST_Dynamic) {
    EPI.ExceptionSpec.Exceptions = exceptions();
  } else if (isComputedNoexcept(EPI.ExceptionSpec.Type)) {
    EPI.ExceptionSpec.NoexceptExpr = getNoexceptExpr();
  } else if (EPI.ExceptionSpec.Type == EST_Uninstantiated) {
    EPI.ExceptionSpec.SourceDecl = getExceptionSpecDecl();
    EPI.ExceptionSpec.SourceTemplate = getExceptionSpecTemplate();
  } else if (EPI.ExceptionSpec.Type == EST_Unevaluated) {
    EPI.ExceptionSpec.SourceDecl = getExceptionSpecDecl();
  }
  EPI.ExtParameterInfos = getExtParameterInfosOrNull();
  return EPI;
}

/// Get the kind of exception specification on this function.
ExceptionSpecificationType getExceptionSpecType() const {
  return static_cast<ExceptionSpecificationType>(
      FunctionTypeBits.ExceptionSpecType);
}

/// Return whether this function has any kind of exception spec.
bool hasExceptionSpec() const { return getExceptionSpecType() != EST_None; }

/// Return whether this function has a dynamic (throw) exception spec.
bool hasDynamicExceptionSpec() const {
  return isDynamicExceptionSpec(getExceptionSpecType());
}

/// Return whether this function has a noexcept exception spec.
bool hasNoexceptExceptionSpec() const {
  return isNoexceptExceptionSpec(getExceptionSpecType());
}

/// Return whether this function has a dependent exception spec.
bool hasDependentExceptionSpec() const;

/// Return whether this function has an instantiation-dependent exception
/// spec.
bool hasInstantiationDependentExceptionSpec() const;

/// Return the number of types in the exception specification.
unsigned getNumExceptions() const {
  return getExceptionSpecType() == EST_Dynamic
             ? getTrailingObjects<FunctionTypeExtraBitfields>()
                   ->NumExceptionType
             : 0;
}

/// Return the ith exception type, where 0 <= i < getNumExceptions().
QualType getExceptionType(unsigned i) const {
  assert(i < getNumExceptions() && "Invalid exception number!")((i < getNumExceptions() && "Invalid exception number!"
) ? static_cast<void> (0) : __assert_fail ("i < getNumExceptions() && \"Invalid exception number!\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 3996, __PRETTY_FUNCTION__));
  return exception_begin()[i];
}

/// Return the expression inside noexcept(expression), or a null pointer
/// if there is none (because the exception spec is not of this form).
Expr *getNoexceptExpr() const {
  if (!isComputedNoexcept(getExceptionSpecType()))
    return nullptr;
  return *getTrailingObjects<Expr *>();
}

/// If this function type has an exception specification which hasn't
/// been determined yet (either because it has not been evaluated or because
/// it has not been instantiated), this is the function whose exception
/// specification is represented by this type.
FunctionDecl *getExceptionSpecDecl() const {
  if (getExceptionSpecType() != EST_Uninstantiated &&
      getExceptionSpecType() != EST_Unevaluated)
    return nullptr;
  return getTrailingObjects<FunctionDecl *>()[0];
}

/// If this function type has an uninstantiated exception
/// specification, this is the function whose exception specification
/// should be instantiated to find the exception specification for
/// this type.
FunctionDecl *getExceptionSpecTemplate() const {
  if (getExceptionSpecType() != EST_Uninstantiated)
    return nullptr;
  return getTrailingObjects<FunctionDecl *>()[1];
}

/// Determine whether this function type has a non-throwing exception
/// specification.
CanThrowResult canThrow() const;

/// Determine whether this function type has a non-throwing exception
/// specification. If this depends on template arguments, returns
/// \c ResultIfDependent.
bool isNothrow(bool ResultIfDependent = false) const {
  return ResultIfDependent ? canThrow() != CT_Can : canThrow() == CT_Cannot;
}

/// Whether this function prototype is variadic.
bool isVariadic() const { return FunctionTypeBits.Variadic; }

/// Determines whether this function prototype contains a
/// parameter pack at the end.
///
/// A function template whose last parameter is a parameter pack can be
/// called with an arbitrary number of arguments, much like a variadic
/// function.
bool isTemplateVariadic() const;

/// Whether this function prototype has a trailing return type.
bool hasTrailingReturn() const { return FunctionTypeBits.HasTrailingReturn; }

Qualifiers getMethodQuals() const {
  if (hasExtQualifiers())
    return *getTrailingObjects<Qualifiers>();
  else
    return getFastTypeQuals();
}

/// Retrieve the ref-qualifier associated with this function type.
RefQualifierKind getRefQualifier() const {
  return static_cast<RefQualifierKind>(FunctionTypeBits.RefQualifier);
}

using param_type_iterator = const QualType *;
using param_type_range = llvm::iterator_range<param_type_iterator>;

param_type_range param_types() const {
  return param_type_range(param_type_begin(), param_type_end());
}

param_type_iterator param_type_begin() const {
  return getTrailingObjects<QualType>();
}

param_type_iterator param_type_end() const {
  return param_type_begin() + getNumParams();
}

using exception_iterator = const QualType *;

ArrayRef<QualType> exceptions() const {
  return llvm::makeArrayRef(exception_begin(), exception_end());
}

exception_iterator exception_begin() const {
  return reinterpret_cast<exception_iterator>(
      getTrailingObjects<ExceptionType>());
}

exception_iterator exception_end() const {
  return exception_begin() + getNumExceptions();
}

/// Is there any interesting extra information for any of the parameters
/// of this function type?
bool hasExtParameterInfos() const {
  return FunctionTypeBits.HasExtParameterInfos;
}

ArrayRef<ExtParameterInfo> getExtParameterInfos() const {
  assert(hasExtParameterInfos())((hasExtParameterInfos()) ? static_cast<void> (0) : __assert_fail
 ("hasExtParameterInfos()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4103, __PRETTY_FUNCTION__));
  return ArrayRef<ExtParameterInfo>(getTrailingObjects<ExtParameterInfo>(),
                                    getNumParams());
}

/// Return a pointer to the beginning of the array of extra parameter
/// information, if present, or else null if none of the parameters
/// carry it.  This is equivalent to getExtProtoInfo().ExtParameterInfos.
const ExtParameterInfo *getExtParameterInfosOrNull() const {
  if (!hasExtParameterInfos())
    return nullptr;
  return getTrailingObjects<ExtParameterInfo>();
}

ExtParameterInfo getExtParameterInfo(unsigned I) const {
  assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4118, __PRETTY_FUNCTION__));
  if (hasExtParameterInfos())
    return getTrailingObjects<ExtParameterInfo>()[I];
  return ExtParameterInfo();
}

ParameterABI getParameterABI(unsigned I) const {
  assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4125, __PRETTY_FUNCTION__));
  if (hasExtParameterInfos())
    return getTrailingObjects<ExtParameterInfo>()[I].getABI();
  return ParameterABI::Ordinary;
}

bool isParamConsumed(unsigned I) const {
  assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4132, __PRETTY_FUNCTION__));
  if (hasExtParameterInfos())
    return getTrailingObjects<ExtParameterInfo>()[I].isConsumed();
  return false;
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void printExceptionSpecification(raw_ostream &OS,
                                 const PrintingPolicy &Policy) const;

static bool classof(const Type *T) {
  return T->getTypeClass() == FunctionProto;
}

void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx);
static void Profile(llvm::FoldingSetNodeID &ID, QualType Result,
                    param_type_iterator ArgTys, unsigned NumArgs,
                    const ExtProtoInfo &EPI, const ASTContext &Context,
                    bool Canonical);
4153};

4155/// Represents the dependent type named by a dependently-scoped
4156/// typename using declaration, e.g.
4157///   using typename Base<T>::foo;
4158///
4159/// Template instantiation turns these into the underlying type.
4160class UnresolvedUsingType : public Type {
friend class ASTContext; // ASTContext creates these.

UnresolvedUsingTypenameDecl *Decl;

UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D)
    : Type(UnresolvedUsing, QualType(), true, true, false,
           /*ContainsUnexpandedParameterPack=*/false),
      Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {}

4170public:
UnresolvedUsingTypenameDecl *getDecl() const { return Decl; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == UnresolvedUsing;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  return Profile(ID, Decl);
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    UnresolvedUsingTypenameDecl *D) {
  ID.AddPointer(D);
}
4188};

4190class TypedefType : public Type {
TypedefNameDecl *Decl;

4193protected:
friend class ASTContext; // ASTContext creates these.

TypedefType(TypeClass tc, const TypedefNameDecl *D, QualType can)
    : Type(tc, can, can->isDependentType(),
           can->isInstantiationDependentType(),
           can->isVariablyModifiedType(),
           /*ContainsUnexpandedParameterPack=*/false),
      Decl(const_cast<TypedefNameDecl*>(D)) {
  assert(!isa<TypedefType>(can) && "Invalid canonical type")((!isa<TypedefType>(can) && "Invalid canonical type"
) ? static_cast<void> (0) : __assert_fail ("!isa<TypedefType>(can) && \"Invalid canonical type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4202, __PRETTY_FUNCTION__));
}

4205public:
TypedefNameDecl *getDecl() const { return Decl; }

bool isSugared() const { return true; }
QualType desugar() const;

static bool classof(const Type *T) { return T->getTypeClass() == Typedef; }
4212};

4214/// Sugar type that represents a type that was qualified by a qualifier written
4215/// as a macro invocation.
4216class MacroQualifiedType : public Type {
friend class ASTContext; // ASTContext creates these.

QualType UnderlyingTy;
const IdentifierInfo *MacroII;

MacroQualifiedType(QualType UnderlyingTy, QualType CanonTy,
                   const IdentifierInfo *MacroII)
    : Type(MacroQualified, CanonTy, UnderlyingTy->isDependentType(),
           UnderlyingTy->isInstantiationDependentType(),
           UnderlyingTy->isVariablyModifiedType(),
           UnderlyingTy->containsUnexpandedParameterPack()),
      UnderlyingTy(UnderlyingTy), MacroII(MacroII) {
  assert(isa<AttributedType>(UnderlyingTy) &&((isa<AttributedType>(UnderlyingTy) && "Expected a macro qualified type to only wrap attributed types."
) ? static_cast<void> (0) : __assert_fail ("isa<AttributedType>(UnderlyingTy) && \"Expected a macro qualified type to only wrap attributed types.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4230, __PRETTY_FUNCTION__))
         "Expected a macro qualified type to only wrap attributed types.")((isa<AttributedType>(UnderlyingTy) && "Expected a macro qualified type to only wrap attributed types."
) ? static_cast<void> (0) : __assert_fail ("isa<AttributedType>(UnderlyingTy) && \"Expected a macro qualified type to only wrap attributed types.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4230, __PRETTY_FUNCTION__));
}

4233public:
const IdentifierInfo *getMacroIdentifier() const { return MacroII; }
QualType getUnderlyingType() const { return UnderlyingTy; }

/// Return this attributed type's modified type with no qualifiers attached to
/// it.
QualType getModifiedType() const;

bool isSugared() const { return true; }
QualType desugar() const;

static bool classof(const Type *T) {
  return T->getTypeClass() == MacroQualified;
}
4247};

4249/// Represents a `typeof` (or __typeof__) expression (a GCC extension).
4250class TypeOfExprType : public Type {
Expr *TOExpr;

4253protected:
friend class ASTContext; // ASTContext creates these.

TypeOfExprType(Expr *E, QualType can = QualType());

4258public:
Expr *getUnderlyingExpr() const { return TOExpr; }

/// Remove a single level of sugar.
QualType desugar() const;

/// Returns whether this type directly provides sugar.
bool isSugared() const;

static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; }
4268};

4270/// Internal representation of canonical, dependent
4271/// `typeof(expr)` types.
4272///
4273/// This class is used internally by the ASTContext to manage
4274/// canonical, dependent types, only. Clients will only see instances
4275/// of this class via TypeOfExprType nodes.
4276class DependentTypeOfExprType
: public TypeOfExprType, public llvm::FoldingSetNode {
const ASTContext &Context;

4280public:
DependentTypeOfExprType(const ASTContext &Context, Expr *E)
    : TypeOfExprType(E), Context(Context) {}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getUnderlyingExpr());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    Expr *E);
4290};

4292/// Represents `typeof(type)`, a GCC extension.
4293class TypeOfType : public Type {
friend class ASTContext; // ASTContext creates these.

QualType TOType;

TypeOfType(QualType T, QualType can)
    : Type(TypeOf, can, T->isDependentType(),
           T->isInstantiationDependentType(),
           T->isVariablyModifiedType(),
           T->containsUnexpandedParameterPack()),
      TOType(T) {
  assert(!isa<TypedefType>(can) && "Invalid canonical type")((!isa<TypedefType>(can) && "Invalid canonical type"
) ? static_cast<void> (0) : __assert_fail ("!isa<TypedefType>(can) && \"Invalid canonical type\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4304, __PRETTY_FUNCTION__));
}

4307public:
QualType getUnderlyingType() const { return TOType; }

/// Remove a single level of sugar.
QualType desugar() const { return getUnderlyingType(); }

/// Returns whether this type directly provides sugar.
bool isSugared() const { return true; }

static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; }
4317};

4319/// Represents the type `decltype(expr)` (C++11).
4320class DecltypeType : public Type {
Expr *E;
QualType UnderlyingType;

4324protected:
friend class ASTContext; // ASTContext creates these.

DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType());

4329public:
Expr *getUnderlyingExpr() const { return E; }
QualType getUnderlyingType() const { return UnderlyingType; }

/// Remove a single level of sugar.
QualType desugar() const;

/// Returns whether this type directly provides sugar.
bool isSugared() const;

static bool classof(const Type *T) { return T->getTypeClass() == Decltype; }
4340};

4342/// Internal representation of canonical, dependent
4343/// decltype(expr) types.
4344///
4345/// This class is used internally by the ASTContext to manage
4346/// canonical, dependent types, only. Clients will only see instances
4347/// of this class via DecltypeType nodes.
4348class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode {
const ASTContext &Context;

4351public:
DependentDecltypeType(const ASTContext &Context, Expr *E);

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, Context, getUnderlyingExpr());
}

static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
                    Expr *E);
4360};

4362/// A unary type transform, which is a type constructed from another.
4363class UnaryTransformType : public Type {
4364public:
enum UTTKind {
  EnumUnderlyingType
};

4369private:
/// The untransformed type.
QualType BaseType;

/// The transformed type if not dependent, otherwise the same as BaseType.
QualType UnderlyingType;

UTTKind UKind;

4378protected:
friend class ASTContext;

UnaryTransformType(QualType BaseTy, QualType UnderlyingTy, UTTKind UKind,
                   QualType CanonicalTy);

4384public:
bool isSugared() const { return !isDependentType(); }
QualType desugar() const { return UnderlyingType; }

QualType getUnderlyingType() const { return UnderlyingType; }
QualType getBaseType() const { return BaseType; }

UTTKind getUTTKind() const { return UKind; }

static bool classof(const Type *T) {
  return T->getTypeClass() == UnaryTransform;
}
4396};

4398/// Internal representation of canonical, dependent
4399/// __underlying_type(type) types.
4400///
4401/// This class is used internally by the ASTContext to manage
4402/// canonical, dependent types, only. Clients will only see instances
4403/// of this class via UnaryTransformType nodes.
4404class DependentUnaryTransformType : public UnaryTransformType,
                                  public llvm::FoldingSetNode {
4406public:
DependentUnaryTransformType(const ASTContext &C, QualType BaseType,
                            UTTKind UKind);

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getBaseType(), getUTTKind());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType BaseType,
                    UTTKind UKind) {
  ID.AddPointer(BaseType.getAsOpaquePtr());
  ID.AddInteger((unsigned)UKind);
}
4419};

4421class TagType : public Type {
friend class ASTReader;

/// Stores the TagDecl associated with this type. The decl may point to any
/// TagDecl that declares the entity.
TagDecl *decl;

4428protected:
TagType(TypeClass TC, const TagDecl *D, QualType can);

4431public:
TagDecl *getDecl() const;

/// Determines whether this type is in the process of being defined.
bool isBeingDefined() const;

static bool classof(const Type *T) {
  return T->getTypeClass() == Enum || T->getTypeClass() == Record;
}
4440};

4442/// A helper class that allows the use of isa/cast/dyncast
4443/// to detect TagType objects of structs/unions/classes.
4444class RecordType : public TagType {
4445protected:
friend class ASTContext; // ASTContext creates these.

explicit RecordType(const RecordDecl *D)
    : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) {}
explicit RecordType(TypeClass TC, RecordDecl *D)
    : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) {}

4453public:
RecordDecl *getDecl() const {
  return reinterpret_cast<RecordDecl*>(TagType::getDecl());
}

/// Recursively check all fields in the record for const-ness. If any field
/// is declared const, return true. Otherwise, return false.
bool hasConstFields() const;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) { return T->getTypeClass() == Record; }
4466};

4468/// A helper class that allows the use of isa/cast/dyncast
4469/// to detect TagType objects of enums.
4470class EnumType : public TagType {
friend class ASTContext; // ASTContext creates these.

explicit EnumType(const EnumDecl *D)
    : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) {}

4476public:
EnumDecl *getDecl() const {
  return reinterpret_cast<EnumDecl*>(TagType::getDecl());
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) { return T->getTypeClass() == Enum; }
4485};

4487/// An attributed type is a type to which a type attribute has been applied.
4488///
4489/// The "modified type" is the fully-sugared type to which the attributed
4490/// type was applied; generally it is not canonically equivalent to the
4491/// attributed type. The "equivalent type" is the minimally-desugared type
4492/// which the type is canonically equivalent to.
4493///
4494/// For example, in the following attributed type:
4495///     int32_t __attribute__((vector_size(16)))
4496///   - the modified type is the TypedefType for int32_t
4497///   - the equivalent type is VectorType(16, int32_t)
4498///   - the canonical type is VectorType(16, int)
4499class AttributedType : public Type, public llvm::FoldingSetNode {
4500public:
using Kind = attr::Kind;

4503private:
friend class ASTContext; // ASTContext creates these

QualType ModifiedType;
QualType EquivalentType;

AttributedType(QualType canon, attr::Kind attrKind, QualType modified,
               QualType equivalent)
    : Type(Attributed, canon, equivalent->isDependentType(),
           equivalent->isInstantiationDependentType(),
           equivalent->isVariablyModifiedType(),
           equivalent->containsUnexpandedParameterPack()),
      ModifiedType(modified), EquivalentType(equivalent) {
  AttributedTypeBits.AttrKind = attrKind;
}

4519public:
Kind getAttrKind() const {
  return static_cast<Kind>(AttributedTypeBits.AttrKind);
}

QualType getModifiedType() const { return ModifiedType; }
QualType getEquivalentType() const { return EquivalentType; }

bool isSugared() const { return true; }
QualType desugar() const { return getEquivalentType(); }

/// Does this attribute behave like a type qualifier?
///
/// A type qualifier adjusts a type to provide specialized rules for
/// a specific object, like the standard const and volatile qualifiers.
/// This includes attributes controlling things like nullability,
/// address spaces, and ARC ownership.  The value of the object is still
/// largely described by the modified type.
///
/// In contrast, many type attributes "rewrite" their modified type to
/// produce a fundamentally different type, not necessarily related in any
/// formalizable way to the original type.  For example, calling convention
/// and vector attributes are not simple type qualifiers.
///
/// Type qualifiers are often, but not always, reflected in the canonical
/// type.
bool isQualifier() const;

bool isMSTypeSpec() const;

bool isCallingConv() const;

llvm::Optional<NullabilityKind> getImmediateNullability() const;

/// Retrieve the attribute kind corresponding to the given
/// nullability kind.
static Kind getNullabilityAttrKind(NullabilityKind kind) {
  switch (kind) {
  case NullabilityKind::NonNull:
    return attr::TypeNonNull;

  case NullabilityKind::Nullable:
    return attr::TypeNullable;

  case NullabilityKind::Unspecified:
    return attr::TypeNullUnspecified;
  }
  llvm_unreachable("Unknown nullability kind.")::llvm::llvm_unreachable_internal("Unknown nullability kind."
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4566);
}

/// Strip off the top-level nullability annotation on the given
/// type, if it's there.
///
/// \param T The type to strip. If the type is exactly an
/// AttributedType specifying nullability (without looking through
/// type sugar), the nullability is returned and this type changed
/// to the underlying modified type.
///
/// \returns the top-level nullability, if present.
static Optional<NullabilityKind> stripOuterNullability(QualType &T);

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getAttrKind(), ModifiedType, EquivalentType);
}

static void Profile(llvm::FoldingSetNodeID &ID, Kind attrKind,
                    QualType modified, QualType equivalent) {
  ID.AddInteger(attrKind);
  ID.AddPointer(modified.getAsOpaquePtr());
  ID.AddPointer(equivalent.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Attributed;
}
4594};

4596class TemplateTypeParmType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

// Helper data collector for canonical types.
struct CanonicalTTPTInfo {
  unsigned Depth : 15;
  unsigned ParameterPack : 1;
  unsigned Index : 16;
};

union {
  // Info for the canonical type.
  CanonicalTTPTInfo CanTTPTInfo;

  // Info for the non-canonical type.
  TemplateTypeParmDecl *TTPDecl;
};

/// Build a non-canonical type.
TemplateTypeParmType(TemplateTypeParmDecl *TTPDecl, QualType Canon)
    : Type(TemplateTypeParm, Canon, /*Dependent=*/true,
           /*InstantiationDependent=*/true,
           /*VariablyModified=*/false,
           Canon->containsUnexpandedParameterPack()),
      TTPDecl(TTPDecl) {}

/// Build the canonical type.
TemplateTypeParmType(unsigned D, unsigned I, bool PP)
    : Type(TemplateTypeParm, QualType(this, 0),
           /*Dependent=*/true,
           /*InstantiationDependent=*/true,
           /*VariablyModified=*/false, PP) {
  CanTTPTInfo.Depth = D;
  CanTTPTInfo.Index = I;
  CanTTPTInfo.ParameterPack = PP;
}

const CanonicalTTPTInfo& getCanTTPTInfo() const {
  QualType Can = getCanonicalTypeInternal();
  return Can->castAs<TemplateTypeParmType>()->CanTTPTInfo;
}

4638public:
unsigned getDepth() const { return getCanTTPTInfo().Depth; }
unsigned getIndex() const { return getCanTTPTInfo().Index; }
bool isParameterPack() const { return getCanTTPTInfo().ParameterPack; }

TemplateTypeParmDecl *getDecl() const {
  return isCanonicalUnqualified() ? nullptr : TTPDecl;
}

IdentifierInfo *getIdentifier() const;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getDepth(), getIndex(), isParameterPack(), getDecl());
}

static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth,
                    unsigned Index, bool ParameterPack,
                    TemplateTypeParmDecl *TTPDecl) {
  ID.AddInteger(Depth);
  ID.AddInteger(Index);
  ID.AddBoolean(ParameterPack);
  ID.AddPointer(TTPDecl);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == TemplateTypeParm;
}
4668};

4670/// Represents the result of substituting a type for a template
4671/// type parameter.
4672///
4673/// Within an instantiated template, all template type parameters have
4674/// been replaced with these.  They are used solely to record that a
4675/// type was originally written as a template type parameter;
4676/// therefore they are never canonical.
4677class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode {
friend class ASTContext;

// The original type parameter.
const TemplateTypeParmType *Replaced;

SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon)
    : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType(),
           Canon->isInstantiationDependentType(),
           Canon->isVariablyModifiedType(),
           Canon->containsUnexpandedParameterPack()),
      Replaced(Param) {}

4690public:
/// Gets the template parameter that was substituted for.
const TemplateTypeParmType *getReplacedParameter() const {
  return Replaced;
}

/// Gets the type that was substituted for the template
/// parameter.
QualType getReplacementType() const {
  return getCanonicalTypeInternal();
}

bool isSugared() const { return true; }
QualType desugar() const { return getReplacementType(); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getReplacedParameter(), getReplacementType());
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    const TemplateTypeParmType *Replaced,
                    QualType Replacement) {
  ID.AddPointer(Replaced);
  ID.AddPointer(Replacement.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == SubstTemplateTypeParm;
}
4719};

4721/// Represents the result of substituting a set of types for a template
4722/// type parameter pack.
4723///
4724/// When a pack expansion in the source code contains multiple parameter packs
4725/// and those parameter packs correspond to different levels of template
4726/// parameter lists, this type node is used to represent a template type
4727/// parameter pack from an outer level, which has already had its argument pack
4728/// substituted but that still lives within a pack expansion that itself
4729/// could not be instantiated. When actually performing a substitution into
4730/// that pack expansion (e.g., when all template parameters have corresponding
4731/// arguments), this type will be replaced with the \c SubstTemplateTypeParmType
4732/// at the current pack substitution index.
4733class SubstTemplateTypeParmPackType : public Type, public llvm::FoldingSetNode {
friend class ASTContext;

/// The original type parameter.
const TemplateTypeParmType *Replaced;

/// A pointer to the set of template arguments that this
/// parameter pack is instantiated with.
const TemplateArgument *Arguments;

SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param,
                              QualType Canon,
                              const TemplateArgument &ArgPack);

4747public:
IdentifierInfo *getIdentifier() const { return Replaced->getIdentifier(); }

/// Gets the template parameter that was substituted for.
const TemplateTypeParmType *getReplacedParameter() const {
  return Replaced;
}

unsigned getNumArgs() const {
  return SubstTemplateTypeParmPackTypeBits.NumArgs;
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

TemplateArgument getArgumentPack() const;

void Profile(llvm::FoldingSetNodeID &ID);
static void Profile(llvm::FoldingSetNodeID &ID,
                    const TemplateTypeParmType *Replaced,
                    const TemplateArgument &ArgPack);

static bool classof(const Type *T) {
  return T->getTypeClass() == SubstTemplateTypeParmPack;
}
4772};

4774/// Common base class for placeholders for types that get replaced by
4775/// placeholder type deduction: C++11 auto, C++14 decltype(auto), C++17 deduced
4776/// class template types, and (eventually) constrained type names from the C++
4777/// Concepts TS.
4778///
4779/// These types are usually a placeholder for a deduced type. However, before
4780/// the initializer is attached, or (usually) if the initializer is
4781/// type-dependent, there is no deduced type and the type is canonical. In
4782/// the latter case, it is also a dependent type.
4783class DeducedType : public Type {
4784protected:
DeducedType(TypeClass TC, QualType DeducedAsType, bool IsDependent,
            bool IsInstantiationDependent, bool ContainsParameterPack)
    : Type(TC,
           // FIXME: Retain the sugared deduced type?
           DeducedAsType.isNull() ? QualType(this, 0)
                                  : DeducedAsType.getCanonicalType(),
           IsDependent, IsInstantiationDependent,
           /*VariablyModified=*/false, ContainsParameterPack) {
  if (!DeducedAsType.isNull()) {
    if (DeducedAsType->isDependentType())
      setDependent();
    if (DeducedAsType->isInstantiationDependentType())
      setInstantiationDependent();
    if (DeducedAsType->containsUnexpandedParameterPack())
      setContainsUnexpandedParameterPack();
  }
}

4803public:
bool isSugared() const { return !isCanonicalUnqualified(); }
QualType desugar() const { return getCanonicalTypeInternal(); }

/// Get the type deduced for this placeholder type, or null if it's
/// either not been deduced or was deduced to a dependent type.
QualType getDeducedType() const {
  return !isCanonicalUnqualified() ? getCanonicalTypeInternal() : QualType();
}
bool isDeduced() const {
  return !isCanonicalUnqualified() || isDependentType();
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Auto ||
         T->getTypeClass() == DeducedTemplateSpecialization;
}
4820};

4822/// Represents a C++11 auto or C++14 decltype(auto) type.
4823class AutoType : public DeducedType, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
         bool IsDeducedAsDependent, bool IsDeducedAsPack)
    : DeducedType(Auto, DeducedAsType, IsDeducedAsDependent,
                  IsDeducedAsDependent, IsDeducedAsPack) {
  AutoTypeBits.Keyword = (unsigned)Keyword;
}

4833public:
bool isDecltypeAuto() const {
  return getKeyword() == AutoTypeKeyword::DecltypeAuto;
}

AutoTypeKeyword getKeyword() const {
  return (AutoTypeKeyword)AutoTypeBits.Keyword;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getDeducedType(), getKeyword(), isDependentType(),
          containsUnexpandedParameterPack());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Deduced,
                    AutoTypeKeyword Keyword, bool IsDependent, bool IsPack) {
  ID.AddPointer(Deduced.getAsOpaquePtr());
  ID.AddInteger((unsigned)Keyword);
  ID.AddBoolean(IsDependent);
  ID.AddBoolean(IsPack);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Auto;
}
4858};

4860/// Represents a C++17 deduced template specialization type.
4861class DeducedTemplateSpecializationType : public DeducedType,
                                        public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

/// The name of the template whose arguments will be deduced.
TemplateName Template;

DeducedTemplateSpecializationType(TemplateName Template,
                                  QualType DeducedAsType,
                                  bool IsDeducedAsDependent)
    : DeducedType(DeducedTemplateSpecialization, DeducedAsType,
                  IsDeducedAsDependent || Template.isDependent(),
                  IsDeducedAsDependent || Template.isInstantiationDependent(),
                  Template.containsUnexpandedParameterPack()),
      Template(Template) {}

4877public:
/// Retrieve the name of the template that we are deducing.
TemplateName getTemplateName() const { return Template;}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getTemplateName(), getDeducedType(), isDependentType());
}

static void Profile(llvm::FoldingSetNodeID &ID, TemplateName Template,
                    QualType Deduced, bool IsDependent) {
  Template.Profile(ID);
  ID.AddPointer(Deduced.getAsOpaquePtr());
  ID.AddBoolean(IsDependent);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == DeducedTemplateSpecialization;
}
4895};

4897/// Represents a type template specialization; the template
4898/// must be a class template, a type alias template, or a template
4899/// template parameter.  A template which cannot be resolved to one of
4900/// these, e.g. because it is written with a dependent scope
4901/// specifier, is instead represented as a
4902/// @c DependentTemplateSpecializationType.
4903///
4904/// A non-dependent template specialization type is always "sugar",
4905/// typically for a \c RecordType.  For example, a class template
4906/// specialization type of \c vector<int> will refer to a tag type for
4907/// the instantiation \c std::vector<int, std::allocator<int>>
4908///
4909/// Template specializations are dependent if either the template or
4910/// any of the template arguments are dependent, in which case the
4911/// type may also be canonical.
4912///
4913/// Instances of this type are allocated with a trailing array of
4914/// TemplateArguments, followed by a QualType representing the
4915/// non-canonical aliased type when the template is a type alias
4916/// template.
4917class alignas(8) TemplateSpecializationType
  : public Type,
    public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

/// The name of the template being specialized.  This is
/// either a TemplateName::Template (in which case it is a
/// ClassTemplateDecl*, a TemplateTemplateParmDecl*, or a
/// TypeAliasTemplateDecl*), a
/// TemplateName::SubstTemplateTemplateParmPack, or a
/// TemplateName::SubstTemplateTemplateParm (in which case the
/// replacement must, recursively, be one of these).
TemplateName Template;

TemplateSpecializationType(TemplateName T,
                           ArrayRef<TemplateArgument> Args,
                           QualType Canon,
                           QualType Aliased);

4936public:
/// Determine whether any of the given template arguments are dependent.
static bool anyDependentTemplateArguments(ArrayRef<TemplateArgumentLoc> Args,
                                          bool &InstantiationDependent);

static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &,
                                          bool &InstantiationDependent);

/// True if this template specialization type matches a current
/// instantiation in the context in which it is found.
bool isCurrentInstantiation() const {
  return isa<InjectedClassNameType>(getCanonicalTypeInternal());
}

/// Determine if this template specialization type is for a type alias
/// template that has been substituted.
///
/// Nearly every template specialization type whose template is an alias
/// template will be substituted. However, this is not the case when
/// the specialization contains a pack expansion but the template alias
/// does not have a corresponding parameter pack, e.g.,
///
/// \code
/// template<typename T, typename U, typename V> struct S;
/// template<typename T, typename U> using A = S<T, int, U>;
/// template<typename... Ts> struct X {
///   typedef A<Ts...> type; // not a type alias
/// };
/// \endcode
bool isTypeAlias() const { return TemplateSpecializationTypeBits.TypeAlias; }

/// Get the aliased type, if this is a specialization of a type alias
/// template.
QualType getAliasedType() const {
  assert(isTypeAlias() && "not a type alias template specialization")((isTypeAlias() && "not a type alias template specialization"
) ? static_cast<void> (0) : __assert_fail ("isTypeAlias() && \"not a type alias template specialization\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 4970, __PRETTY_FUNCTION__));
  return *reinterpret_cast<const QualType*>(end());
}

using iterator = const TemplateArgument *;

iterator begin() const { return getArgs(); }
iterator end() const; // defined inline in TemplateBase.h

/// Retrieve the name of the template that we are specializing.
TemplateName getTemplateName() const { return Template; }

/// Retrieve the template arguments.
const TemplateArgument *getArgs() const {
  return reinterpret_cast<const TemplateArgument *>(this + 1);
}

/// Retrieve the number of template arguments.
unsigned getNumArgs() const {
  return TemplateSpecializationTypeBits.NumArgs;
}

/// Retrieve a specific template argument as a type.
/// \pre \c isArgType(Arg)
const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h

ArrayRef<TemplateArgument> template_arguments() const {
  return {getArgs(), getNumArgs()};
}

bool isSugared() const {
  return !isDependentType() || isCurrentInstantiation() || isTypeAlias();
}

QualType desugar() const {
  return isTypeAlias() ? getAliasedType() : getCanonicalTypeInternal();
}

void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) {
  Profile(ID, Template, template_arguments(), Ctx);
  if (isTypeAlias())
    getAliasedType().Profile(ID);
}

static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T,
                    ArrayRef<TemplateArgument> Args,
                    const ASTContext &Context);

static bool classof(const Type *T) {
  return T->getTypeClass() == TemplateSpecialization;
}
5021};

5023/// Print a template argument list, including the '<' and '>'
5024/// enclosing the template arguments.
5025void printTemplateArgumentList(raw_ostream &OS,
                             ArrayRef<TemplateArgument> Args,
                             const PrintingPolicy &Policy);

5029void printTemplateArgumentList(raw_ostream &OS,
                             ArrayRef<TemplateArgumentLoc> Args,
                             const PrintingPolicy &Policy);

5033void printTemplateArgumentList(raw_ostream &OS,
                             const TemplateArgumentListInfo &Args,
                             const PrintingPolicy &Policy);

5037/// The injected class name of a C++ class template or class
5038/// template partial specialization.  Used to record that a type was
5039/// spelled with a bare identifier rather than as a template-id; the
5040/// equivalent for non-templated classes is just RecordType.
5041///
5042/// Injected class name types are always dependent.  Template
5043/// instantiation turns these into RecordTypes.
5044///
5045/// Injected class name types are always canonical.  This works
5046/// because it is impossible to compare an injected class name type
5047/// with the corresponding non-injected template type, for the same
5048/// reason that it is impossible to directly compare template
5049/// parameters from different dependent contexts: injected class name
5050/// types can only occur within the scope of a particular templated
5051/// declaration, and within that scope every template specialization
5052/// will canonicalize to the injected class name (when appropriate
5053/// according to the rules of the language).
5054class InjectedClassNameType : public Type {
friend class ASTContext; // ASTContext creates these.
friend class ASTNodeImporter;
friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not
                        // currently suitable for AST reading, too much
                        // interdependencies.

CXXRecordDecl *Decl;

/// The template specialization which this type represents.
/// For example, in
///   template <class T> class A { ... };
/// this is A<T>, whereas in
///   template <class X, class Y> class A<B<X,Y> > { ... };
/// this is A<B<X,Y> >.
///
/// It is always unqualified, always a template specialization type,
/// and always dependent.
QualType InjectedType;

InjectedClassNameType(CXXRecordDecl *D, QualType TST)
    : Type(InjectedClassName, QualType(), /*Dependent=*/true,
           /*InstantiationDependent=*/true,
           /*VariablyModified=*/false,
           /*ContainsUnexpandedParameterPack=*/false),
      Decl(D), InjectedType(TST) {
  assert(isa<TemplateSpecializationType>(TST))((isa<TemplateSpecializationType>(TST)) ? static_cast<
void> (0) : __assert_fail ("isa<TemplateSpecializationType>(TST)"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5080, __PRETTY_FUNCTION__));
  assert(!TST.hasQualifiers())((!TST.hasQualifiers()) ? static_cast<void> (0) : __assert_fail
 ("!TST.hasQualifiers()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5081, __PRETTY_FUNCTION__));
  assert(TST->isDependentType())((TST->isDependentType()) ? static_cast<void> (0) : __assert_fail
 ("TST->isDependentType()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5082, __PRETTY_FUNCTION__));
}

5085public:
QualType getInjectedSpecializationType() const { return InjectedType; }

const TemplateSpecializationType *getInjectedTST() const {
  return cast<TemplateSpecializationType>(InjectedType.getTypePtr());
}

TemplateName getTemplateName() const {
  return getInjectedTST()->getTemplateName();
}

CXXRecordDecl *getDecl() const;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == InjectedClassName;
}
5104};

5106/// The kind of a tag type.
5107enum TagTypeKind {
/// The "struct" keyword.
TTK_Struct,

/// The "__interface" keyword.
TTK_Interface,

/// The "union" keyword.
TTK_Union,

/// The "class" keyword.
TTK_Class,

/// The "enum" keyword.
TTK_Enum
5122};

5124/// The elaboration keyword that precedes a qualified type name or
5125/// introduces an elaborated-type-specifier.
5126enum ElaboratedTypeKeyword {
/// The "struct" keyword introduces the elaborated-type-specifier.
ETK_Struct,

/// The "__interface" keyword introduces the elaborated-type-specifier.
ETK_Interface,

/// The "union" keyword introduces the elaborated-type-specifier.
ETK_Union,

/// The "class" keyword introduces the elaborated-type-specifier.
ETK_Class,

/// The "enum" keyword introduces the elaborated-type-specifier.
ETK_Enum,

/// The "typename" keyword precedes the qualified type name, e.g.,
/// \c typename T::type.
ETK_Typename,

/// No keyword precedes the qualified type name.
ETK_None
5148};

5150/// A helper class for Type nodes having an ElaboratedTypeKeyword.
5151/// The keyword in stored in the free bits of the base class.
5152/// Also provides a few static helpers for converting and printing
5153/// elaborated type keyword and tag type kind enumerations.
5154class TypeWithKeyword : public Type {
5155protected:
TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc,
                QualType Canonical, bool Dependent,
                bool InstantiationDependent, bool VariablyModified,
                bool ContainsUnexpandedParameterPack)
    : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
           ContainsUnexpandedParameterPack) {
  TypeWithKeywordBits.Keyword = Keyword;
}

5165public:
ElaboratedTypeKeyword getKeyword() const {
  return static_cast<ElaboratedTypeKeyword>(TypeWithKeywordBits.Keyword);
}

/// Converts a type specifier (DeclSpec::TST) into an elaborated type keyword.
static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec);

/// Converts a type specifier (DeclSpec::TST) into a tag type kind.
/// It is an error to provide a type specifier which *isn't* a tag kind here.
static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec);

/// Converts a TagTypeKind into an elaborated type keyword.
static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag);

/// Converts an elaborated type keyword into a TagTypeKind.
/// It is an error to provide an elaborated type keyword
/// which *isn't* a tag kind here.
static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword);

static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword);

static StringRef getKeywordName(ElaboratedTypeKeyword Keyword);

static StringRef getTagTypeKindName(TagTypeKind Kind) {
  return getKeywordName(getKeywordForTagTypeKind(Kind));
}

class CannotCastToThisType {};
static CannotCastToThisType classof(const Type *);
5195};

5197/// Represents a type that was referred to using an elaborated type
5198/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type,
5199/// or both.
5200///
5201/// This type is used to keep track of a type name as written in the
5202/// source code, including tag keywords and any nested-name-specifiers.
5203/// The type itself is always "sugar", used to express what was written
5204/// in the source code but containing no additional semantic information.
5205class ElaboratedType final
  : public TypeWithKeyword,
    public llvm::FoldingSetNode,
    private llvm::TrailingObjects<ElaboratedType, TagDecl *> {
friend class ASTContext; // ASTContext creates these
friend TrailingObjects;

/// The nested name specifier containing the qualifier.
NestedNameSpecifier *NNS;

/// The type that this qualified name refers to.
QualType NamedType;

/// The (re)declaration of this tag type owned by this occurrence is stored
/// as a trailing object if there is one. Use getOwnedTagDecl to obtain
/// it, or obtain a null pointer if there is none.

ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
               QualType NamedType, QualType CanonType, TagDecl *OwnedTagDecl)
    : TypeWithKeyword(Keyword, Elaborated, CanonType,
                      NamedType->isDependentType(),
                      NamedType->isInstantiationDependentType(),
                      NamedType->isVariablyModifiedType(),
                      NamedType->containsUnexpandedParameterPack()),
      NNS(NNS), NamedType(NamedType) {
  ElaboratedTypeBits.HasOwnedTagDecl = false;
  if (OwnedTagDecl) {
    ElaboratedTypeBits.HasOwnedTagDecl = true;
    *getTrailingObjects<TagDecl *>() = OwnedTagDecl;
  }
  assert(!(Keyword == ETK_None && NNS == nullptr) &&((!(Keyword == ETK_None && NNS == nullptr) &&
 "ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5237, __PRETTY_FUNCTION__))
         "ElaboratedType cannot have elaborated type keyword "((!(Keyword == ETK_None && NNS == nullptr) &&
 "ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5237, __PRETTY_FUNCTION__))
         "and name qualifier both null.")((!(Keyword == ETK_None && NNS == nullptr) &&
 "ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5237, __PRETTY_FUNCTION__));
}

5240public:
/// Retrieve the qualification on this type.
NestedNameSpecifier *getQualifier() const { return NNS; }

/// Retrieve the type named by the qualified-id.
QualType getNamedType() const { return NamedType; }

/// Remove a single level of sugar.
QualType desugar() const { return getNamedType(); }

/// Returns whether this type directly provides sugar.
bool isSugared() const { return true; }

/// Return the (re)declaration of this type owned by this occurrence of this
/// type, or nullptr if there is none.
TagDecl *getOwnedTagDecl() const {
  return ElaboratedTypeBits.HasOwnedTagDecl ? *getTrailingObjects<TagDecl *>()
                                            : nullptr;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getKeyword(), NNS, NamedType, getOwnedTagDecl());
}

static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
                    NestedNameSpecifier *NNS, QualType NamedType,
                    TagDecl *OwnedTagDecl) {
  ID.AddInteger(Keyword);
  ID.AddPointer(NNS);
  NamedType.Profile(ID);
  ID.AddPointer(OwnedTagDecl);
}

static bool classof(const Type *T) { return T->getTypeClass() == Elaborated; }
5274};

5276/// Represents a qualified type name for which the type name is
5277/// dependent.
5278///
5279/// DependentNameType represents a class of dependent types that involve a
5280/// possibly dependent nested-name-specifier (e.g., "T::") followed by a
5281/// name of a type. The DependentNameType may start with a "typename" (for a
5282/// typename-specifier), "class", "struct", "union", or "enum" (for a
5283/// dependent elaborated-type-specifier), or nothing (in contexts where we
5284/// know that we must be referring to a type, e.g., in a base class specifier).
5285/// Typically the nested-name-specifier is dependent, but in MSVC compatibility
5286/// mode, this type is used with non-dependent names to delay name lookup until
5287/// instantiation.
5288class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

/// The nested name specifier containing the qualifier.
NestedNameSpecifier *NNS;

/// The type that this typename specifier refers to.
const IdentifierInfo *Name;

DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
                  const IdentifierInfo *Name, QualType CanonType)
    : TypeWithKeyword(Keyword, DependentName, CanonType, /*Dependent=*/true,
                      /*InstantiationDependent=*/true,
                      /*VariablyModified=*/false,
                      NNS->containsUnexpandedParameterPack()),
      NNS(NNS), Name(Name) {}

5305public:
/// Retrieve the qualification on this type.
NestedNameSpecifier *getQualifier() const { return NNS; }

/// Retrieve the type named by the typename specifier as an identifier.
///
/// This routine will return a non-NULL identifier pointer when the
/// form of the original typename was terminated by an identifier,
/// e.g., "typename T::type".
const IdentifierInfo *getIdentifier() const {
  return Name;
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getKeyword(), NNS, Name);
}

static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
                    NestedNameSpecifier *NNS, const IdentifierInfo *Name) {
  ID.AddInteger(Keyword);
  ID.AddPointer(NNS);
  ID.AddPointer(Name);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentName;
}
5335};

5337/// Represents a template specialization type whose template cannot be
5338/// resolved, e.g.
5339///   A<T>::template B<T>
5340class alignas(8) DependentTemplateSpecializationType
  : public TypeWithKeyword,
    public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

/// The nested name specifier containing the qualifier.
NestedNameSpecifier *NNS;

/// The identifier of the template.
const IdentifierInfo *Name;

DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword,
                                    NestedNameSpecifier *NNS,
                                    const IdentifierInfo *Name,
                                    ArrayRef<TemplateArgument> Args,
                                    QualType Canon);

const TemplateArgument *getArgBuffer() const {
  return reinterpret_cast<const TemplateArgument*>(this+1);
}

TemplateArgument *getArgBuffer() {
  return reinterpret_cast<TemplateArgument*>(this+1);
}

5365public:
NestedNameSpecifier *getQualifier() const { return NNS; }
const IdentifierInfo *getIdentifier() const { return Name; }

/// Retrieve the template arguments.
const TemplateArgument *getArgs() const {
  return getArgBuffer();
}

/// Retrieve the number of template arguments.
unsigned getNumArgs() const {
  return DependentTemplateSpecializationTypeBits.NumArgs;
}

const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h

ArrayRef<TemplateArgument> template_arguments() const {
  return {getArgs(), getNumArgs()};
}

using iterator = const TemplateArgument *;

iterator begin() const { return getArgs(); }
iterator end() const; // inline in TemplateBase.h

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context) {
  Profile(ID, Context, getKeyword(), NNS, Name, {getArgs(), getNumArgs()});
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    const ASTContext &Context,
                    ElaboratedTypeKeyword Keyword,
                    NestedNameSpecifier *Qualifier,
                    const IdentifierInfo *Name,
                    ArrayRef<TemplateArgument> Args);

static bool classof(const Type *T) {
  return T->getTypeClass() == DependentTemplateSpecialization;
}
5407};

5409/// Represents a pack expansion of types.
5410///
5411/// Pack expansions are part of C++11 variadic templates. A pack
5412/// expansion contains a pattern, which itself contains one or more
5413/// "unexpanded" parameter packs. When instantiated, a pack expansion
5414/// produces a series of types, each instantiated from the pattern of
5415/// the expansion, where the Ith instantiation of the pattern uses the
5416/// Ith arguments bound to each of the unexpanded parameter packs. The
5417/// pack expansion is considered to "expand" these unexpanded
5418/// parameter packs.
5419///
5420/// \code
5421/// template<typename ...Types> struct tuple;
5422///
5423/// template<typename ...Types>
5424/// struct tuple_of_references {
5425///   typedef tuple<Types&...> type;
5426/// };
5427/// \endcode
5428///
5429/// Here, the pack expansion \c Types&... is represented via a
5430/// PackExpansionType whose pattern is Types&.
5431class PackExpansionType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these

/// The pattern of the pack expansion.
QualType Pattern;

PackExpansionType(QualType Pattern, QualType Canon,
                  Optional<unsigned> NumExpansions)
    : Type(PackExpansion, Canon, /*Dependent=*/Pattern->isDependentType(),
           /*InstantiationDependent=*/true,
           /*VariablyModified=*/Pattern->isVariablyModifiedType(),
           /*ContainsUnexpandedParameterPack=*/false),
      Pattern(Pattern) {
  PackExpansionTypeBits.NumExpansions =
      NumExpansions ? *NumExpansions + 1 : 0;
}

5448public:
/// Retrieve the pattern of this pack expansion, which is the
/// type that will be repeatedly instantiated when instantiating the
/// pack expansion itself.
QualType getPattern() const { return Pattern; }

/// Retrieve the number of expansions that this pack expansion will
/// generate, if known.
Optional<unsigned> getNumExpansions() const {
  if (PackExpansionTypeBits.NumExpansions)
    return PackExpansionTypeBits.NumExpansions - 1;
  return None;
}

bool isSugared() const { return !Pattern->isDependentType(); }
QualType desugar() const { return isSugared() ? Pattern : QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getPattern(), getNumExpansions());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType Pattern,
                    Optional<unsigned> NumExpansions) {
  ID.AddPointer(Pattern.getAsOpaquePtr());
  ID.AddBoolean(NumExpansions.hasValue());
  if (NumExpansions)
    ID.AddInteger(*NumExpansions);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == PackExpansion;
}
5480};

5482/// This class wraps the list of protocol qualifiers. For types that can
5483/// take ObjC protocol qualifers, they can subclass this class.
5484template <class T>
5485class ObjCProtocolQualifiers {
5486protected:
ObjCProtocolQualifiers() = default;

ObjCProtocolDecl * const *getProtocolStorage() const {
  return const_cast<ObjCProtocolQualifiers*>(this)->getProtocolStorage();
}

ObjCProtocolDecl **getProtocolStorage() {
  return static_cast<T*>(this)->getProtocolStorageImpl();
}

void setNumProtocols(unsigned N) {
  static_cast<T*>(this)->setNumProtocolsImpl(N);
}

void initialize(ArrayRef<ObjCProtocolDecl *> protocols) {
  setNumProtocols(protocols.size());
  assert(getNumProtocols() == protocols.size() &&((getNumProtocols() == protocols.size() && "bitfield overflow in protocol count"
) ? static_cast<void> (0) : __assert_fail ("getNumProtocols() == protocols.size() && \"bitfield overflow in protocol count\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5504, __PRETTY_FUNCTION__))
         "bitfield overflow in protocol count")((getNumProtocols() == protocols.size() && "bitfield overflow in protocol count"
) ? static_cast<void> (0) : __assert_fail ("getNumProtocols() == protocols.size() && \"bitfield overflow in protocol count\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5504, __PRETTY_FUNCTION__));
  if (!protocols.empty())
    memcpy(getProtocolStorage(), protocols.data(),
           protocols.size() * sizeof(ObjCProtocolDecl*));
}

5510public:
using qual_iterator = ObjCProtocolDecl * const *;
using qual_range = llvm::iterator_range<qual_iterator>;

qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
qual_iterator qual_begin() const { return getProtocolStorage(); }
qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); }

bool qual_empty() const { return getNumProtocols() == 0; }

/// Return the number of qualifying protocols in this type, or 0 if
/// there are none.
unsigned getNumProtocols() const {
  return static_cast<const T*>(this)->getNumProtocolsImpl();
}

/// Fetch a protocol by index.
ObjCProtocolDecl *getProtocol(unsigned I) const {
  assert(I < getNumProtocols() && "Out-of-range protocol access")((I < getNumProtocols() && "Out-of-range protocol access"
) ? static_cast<void> (0) : __assert_fail ("I < getNumProtocols() && \"Out-of-range protocol access\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5528, __PRETTY_FUNCTION__));
  return qual_begin()[I];
}

/// Retrieve all of the protocol qualifiers.
ArrayRef<ObjCProtocolDecl *> getProtocols() const {
  return ArrayRef<ObjCProtocolDecl *>(qual_begin(), getNumProtocols());
}
5536};

5538/// Represents a type parameter type in Objective C. It can take
5539/// a list of protocols.
5540class ObjCTypeParamType : public Type,
                        public ObjCProtocolQualifiers<ObjCTypeParamType>,
                        public llvm::FoldingSetNode {
friend class ASTContext;
friend class ObjCProtocolQualifiers<ObjCTypeParamType>;

/// The number of protocols stored on this type.
unsigned NumProtocols : 6;

ObjCTypeParamDecl *OTPDecl;

/// The protocols are stored after the ObjCTypeParamType node. In the
/// canonical type, the list of protocols are sorted alphabetically
/// and uniqued.
ObjCProtocolDecl **getProtocolStorageImpl();

/// Return the number of qualifying protocols in this interface type,
/// or 0 if there are none.
unsigned getNumProtocolsImpl() const {
  return NumProtocols;
}

void setNumProtocolsImpl(unsigned N) {
  NumProtocols = N;
}

ObjCTypeParamType(const ObjCTypeParamDecl *D,
                  QualType can,
                  ArrayRef<ObjCProtocolDecl *> protocols);

5570public:
bool isSugared() const { return true; }
QualType desugar() const { return getCanonicalTypeInternal(); }

static bool classof(const Type *T) {
  return T->getTypeClass() == ObjCTypeParam;
}

void Profile(llvm::FoldingSetNodeID &ID);
static void Profile(llvm::FoldingSetNodeID &ID,
                    const ObjCTypeParamDecl *OTPDecl,
                    ArrayRef<ObjCProtocolDecl *> protocols);

ObjCTypeParamDecl *getDecl() const { return OTPDecl; }
5584};

5586/// Represents a class type in Objective C.
5587///
5588/// Every Objective C type is a combination of a base type, a set of
5589/// type arguments (optional, for parameterized classes) and a list of
5590/// protocols.
5591///
5592/// Given the following declarations:
5593/// \code
5594///   \@class C<T>;
5595///   \@protocol P;
5596/// \endcode
5597///
5598/// 'C' is an ObjCInterfaceType C.  It is sugar for an ObjCObjectType
5599/// with base C and no protocols.
5600///
5601/// 'C<P>' is an unspecialized ObjCObjectType with base C and protocol list [P].
5602/// 'C<C*>' is a specialized ObjCObjectType with type arguments 'C*' and no
5603/// protocol list.
5604/// 'C<C*><P>' is a specialized ObjCObjectType with base C, type arguments 'C*',
5605/// and protocol list [P].
5606///
5607/// 'id' is a TypedefType which is sugar for an ObjCObjectPointerType whose
5608/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType
5609/// and no protocols.
5610///
5611/// 'id<P>' is an ObjCObjectPointerType whose pointee is an ObjCObjectType
5612/// with base BuiltinType::ObjCIdType and protocol list [P].  Eventually
5613/// this should get its own sugar class to better represent the source.
5614class ObjCObjectType : public Type,
                     public ObjCProtocolQualifiers<ObjCObjectType> {
friend class ObjCProtocolQualifiers<ObjCObjectType>;

// ObjCObjectType.NumTypeArgs - the number of type arguments stored
// after the ObjCObjectPointerType node.
// ObjCObjectType.NumProtocols - the number of protocols stored
// after the type arguments of ObjCObjectPointerType node.
//
// These protocols are those written directly on the type.  If
// protocol qualifiers ever become additive, the iterators will need
// to get kindof complicated.
//
// In the canonical object type, these are sorted alphabetically
// and uniqued.

/// Either a BuiltinType or an InterfaceType or sugar for either.
QualType BaseType;

/// Cached superclass type.
mutable llvm::PointerIntPair<const ObjCObjectType *, 1, bool>
  CachedSuperClassType;

QualType *getTypeArgStorage();
const QualType *getTypeArgStorage() const {
  return const_cast<ObjCObjectType *>(this)->getTypeArgStorage();
}

ObjCProtocolDecl **getProtocolStorageImpl();
/// Return the number of qualifying protocols in this interface type,
/// or 0 if there are none.
unsigned getNumProtocolsImpl() const {
  return ObjCObjectTypeBits.NumProtocols;
}
void setNumProtocolsImpl(unsigned N) {
  ObjCObjectTypeBits.NumProtocols = N;
}

5652protected:
enum Nonce_ObjCInterface { Nonce_ObjCInterface };

ObjCObjectType(QualType Canonical, QualType Base,
               ArrayRef<QualType> typeArgs,
               ArrayRef<ObjCProtocolDecl *> protocols,
               bool isKindOf);

ObjCObjectType(enum Nonce_ObjCInterface)
      : Type(ObjCInterface, QualType(), false, false, false, false),
        BaseType(QualType(this_(), 0)) {
  ObjCObjectTypeBits.NumProtocols = 0;
  ObjCObjectTypeBits.NumTypeArgs = 0;
  ObjCObjectTypeBits.IsKindOf = 0;
}

void computeSuperClassTypeSlow() const;

5670public:
/// Gets the base type of this object type.  This is always (possibly
/// sugar for) one of:
///  - the 'id' builtin type (as opposed to the 'id' type visible to the
///    user, which is a typedef for an ObjCObjectPointerType)
///  - the 'Class' builtin type (same caveat)
///  - an ObjCObjectType (currently always an ObjCInterfaceType)
QualType getBaseType() const { return BaseType; }

bool isObjCId() const {
  return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId);
}

bool isObjCClass() const {
  return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass);
}

bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); }
bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); }
bool isObjCUnqualifiedIdOrClass() const {
  if (!qual_empty()) return false;
  if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>())
    return T->getKind() == BuiltinType::ObjCId ||
           T->getKind() == BuiltinType::ObjCClass;
  return false;
}
bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); }
bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); }

/// Gets the interface declaration for this object type, if the base type
/// really is an interface.
ObjCInterfaceDecl *getInterface() const;

/// Determine whether this object type is "specialized", meaning
/// that it has type arguments.
bool isSpecialized() const;

/// Determine whether this object type was written with type arguments.
bool isSpecializedAsWritten() const {
  return ObjCObjectTypeBits.NumTypeArgs > 0;
}

/// Determine whether this object type is "unspecialized", meaning
/// that it has no type arguments.
bool isUnspecialized() const { return !isSpecialized(); }

/// Determine whether this object type is "unspecialized" as
/// written, meaning that it has no type arguments.
bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }

/// Retrieve the type arguments of this object type (semantically).
ArrayRef<QualType> getTypeArgs() const;

/// Retrieve the type arguments of this object type as they were
/// written.
ArrayRef<QualType> getTypeArgsAsWritten() const {
  return llvm::makeArrayRef(getTypeArgStorage(),
                            ObjCObjectTypeBits.NumTypeArgs);
}

/// Whether this is a "__kindof" type as written.
bool isKindOfTypeAsWritten() const { return ObjCObjectTypeBits.IsKindOf; }

/// Whether this ia a "__kindof" type (semantically).
bool isKindOfType() const;

/// Retrieve the type of the superclass of this object type.
///
/// This operation substitutes any type arguments into the
/// superclass of the current class type, potentially producing a
/// specialization of the superclass type. Produces a null type if
/// there is no superclass.
QualType getSuperClassType() const {
  if (!CachedSuperClassType.getInt())
    computeSuperClassTypeSlow();

  assert(CachedSuperClassType.getInt() && "Superclass not set?")((CachedSuperClassType.getInt() && "Superclass not set?"
) ? static_cast<void> (0) : __assert_fail ("CachedSuperClassType.getInt() && \"Superclass not set?\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 5746, __PRETTY_FUNCTION__));
  return QualType(CachedSuperClassType.getPointer(), 0);
}

/// Strip off the Objective-C "kindof" type and (with it) any
/// protocol qualifiers.
QualType stripObjCKindOfTypeAndQuals(const ASTContext &ctx) const;

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == ObjCObject ||
         T->getTypeClass() == ObjCInterface;
}
5761};

5763/// A class providing a concrete implementation
5764/// of ObjCObjectType, so as to not increase the footprint of
5765/// ObjCInterfaceType.  Code outside of ASTContext and the core type
5766/// system should not reference this type.
5767class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode {
friend class ASTContext;

// If anyone adds fields here, ObjCObjectType::getProtocolStorage()
// will need to be modified.

ObjCObjectTypeImpl(QualType Canonical, QualType Base,
                   ArrayRef<QualType> typeArgs,
                   ArrayRef<ObjCProtocolDecl *> protocols,
                   bool isKindOf)
    : ObjCObjectType(Canonical, Base, typeArgs, protocols, isKindOf) {}

5779public:
void Profile(llvm::FoldingSetNodeID &ID);
static void Profile(llvm::FoldingSetNodeID &ID,
                    QualType Base,
                    ArrayRef<QualType> typeArgs,
                    ArrayRef<ObjCProtocolDecl *> protocols,
                    bool isKindOf);
5786};

5788inline QualType *ObjCObjectType::getTypeArgStorage() {
return reinterpret_cast<QualType *>(static_cast<ObjCObjectTypeImpl*>(this)+1);
5790}

5792inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorageImpl() {
  return reinterpret_cast<ObjCProtocolDecl**>(
           getTypeArgStorage() + ObjCObjectTypeBits.NumTypeArgs);
5795}

5797inline ObjCProtocolDecl **ObjCTypeParamType::getProtocolStorageImpl() {
  return reinterpret_cast<ObjCProtocolDecl**>(
           static_cast<ObjCTypeParamType*>(this)+1);
5800}

5802/// Interfaces are the core concept in Objective-C for object oriented design.
5803/// They basically correspond to C++ classes.  There are two kinds of interface
5804/// types: normal interfaces like `NSString`, and qualified interfaces, which
5805/// are qualified with a protocol list like `NSString<NSCopyable, NSAmazing>`.
5806///
5807/// ObjCInterfaceType guarantees the following properties when considered
5808/// as a subtype of its superclass, ObjCObjectType:
5809///   - There are no protocol qualifiers.  To reinforce this, code which
5810///     tries to invoke the protocol methods via an ObjCInterfaceType will
5811///     fail to compile.
5812///   - It is its own base type.  That is, if T is an ObjCInterfaceType*,
5813///     T->getBaseType() == QualType(T, 0).
5814class ObjCInterfaceType : public ObjCObjectType {
friend class ASTContext; // ASTContext creates these.
friend class ASTReader;
friend class ObjCInterfaceDecl;

mutable ObjCInterfaceDecl *Decl;

ObjCInterfaceType(const ObjCInterfaceDecl *D)
    : ObjCObjectType(Nonce_ObjCInterface),
      Decl(const_cast<ObjCInterfaceDecl*>(D)) {}

5825public:
/// Get the declaration of this interface.
ObjCInterfaceDecl *getDecl() const { return Decl; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

static bool classof(const Type *T) {
  return T->getTypeClass() == ObjCInterface;
}

// Nonsense to "hide" certain members of ObjCObjectType within this
// class.  People asking for protocols on an ObjCInterfaceType are
// not going to get what they want: ObjCInterfaceTypes are
// guaranteed to have no protocols.
enum {
  qual_iterator,
  qual_begin,
  qual_end,
  getNumProtocols,
  getProtocol
};
5847};

5849inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const {
QualType baseType = getBaseType();
while (const auto *ObjT = baseType->getAs<ObjCObjectType>()) {
  if (const auto *T = dyn_cast<ObjCInterfaceType>(ObjT))
    return T->getDecl();

  baseType = ObjT->getBaseType();
}

return nullptr;
5859}

5861/// Represents a pointer to an Objective C object.
5862///
5863/// These are constructed from pointer declarators when the pointee type is
5864/// an ObjCObjectType (or sugar for one).  In addition, the 'id' and 'Class'
5865/// types are typedefs for these, and the protocol-qualified types 'id<P>'
5866/// and 'Class<P>' are translated into these.
5867///
5868/// Pointers to pointers to Objective C objects are still PointerTypes;
5869/// only the first level of pointer gets it own type implementation.
5870class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType PointeeType;

ObjCObjectPointerType(QualType Canonical, QualType Pointee)
    : Type(ObjCObjectPointer, Canonical,
           Pointee->isDependentType(),
           Pointee->isInstantiationDependentType(),
           Pointee->isVariablyModifiedType(),
           Pointee->containsUnexpandedParameterPack()),
      PointeeType(Pointee) {}

5883public:
/// Gets the type pointed to by this ObjC pointer.
/// The result will always be an ObjCObjectType or sugar thereof.
QualType getPointeeType() const { return PointeeType; }

/// Gets the type pointed to by this ObjC pointer.  Always returns non-null.
///
/// This method is equivalent to getPointeeType() except that
/// it discards any typedefs (or other sugar) between this
/// type and the "outermost" object type.  So for:
/// \code
///   \@class A; \@protocol P; \@protocol Q;
///   typedef A<P> AP;
///   typedef A A1;
///   typedef A1<P> A1P;
///   typedef A1P<Q> A1PQ;
/// \endcode
/// For 'A*', getObjectType() will return 'A'.
/// For 'A<P>*', getObjectType() will return 'A<P>'.
/// For 'AP*', getObjectType() will return 'A<P>'.
/// For 'A1*', getObjectType() will return 'A'.
/// For 'A1<P>*', getObjectType() will return 'A1<P>'.
/// For 'A1P*', getObjectType() will return 'A1<P>'.
/// For 'A1PQ*', getObjectType() will return 'A1<Q>', because
///   adding protocols to a protocol-qualified base discards the
///   old qualifiers (for now).  But if it didn't, getObjectType()
///   would return 'A1P<Q>' (and we'd have to make iterating over
///   qualifiers more complicated).
const ObjCObjectType *getObjectType() const {
  return PointeeType->castAs<ObjCObjectType>();
}

/// If this pointer points to an Objective C
/// \@interface type, gets the type for that interface.  Any protocol
/// qualifiers on the interface are ignored.
///
/// \return null if the base type for this pointer is 'id' or 'Class'
const ObjCInterfaceType *getInterfaceType() const;

/// If this pointer points to an Objective \@interface
/// type, gets the declaration for that interface.
///
/// \return null if the base type for this pointer is 'id' or 'Class'
ObjCInterfaceDecl *getInterfaceDecl() const {
  return getObjectType()->getInterface();
}

/// True if this is equivalent to the 'id' type, i.e. if
/// its object type is the primitive 'id' type with no protocols.
bool isObjCIdType() const {
  return getObjectType()->isObjCUnqualifiedId();
}

/// True if this is equivalent to the 'Class' type,
/// i.e. if its object tive is the primitive 'Class' type with no protocols.
bool isObjCClassType() const {
  return getObjectType()->isObjCUnqualifiedClass();
}

/// True if this is equivalent to the 'id' or 'Class' type,
bool isObjCIdOrClassType() const {
  return getObjectType()->isObjCUnqualifiedIdOrClass();
}

/// True if this is equivalent to 'id<P>' for some non-empty set of
/// protocols.
bool isObjCQualifiedIdType() const {
  return getObjectType()->isObjCQualifiedId();
}

/// True if this is equivalent to 'Class<P>' for some non-empty set of
/// protocols.
bool isObjCQualifiedClassType() const {
  return getObjectType()->isObjCQualifiedClass();
}

/// Whether this is a "__kindof" type.
bool isKindOfType() const { return getObjectType()->isKindOfType(); }

/// Whether this type is specialized, meaning that it has type arguments.
bool isSpecialized() const { return getObjectType()->isSpecialized(); }

/// Whether this type is specialized, meaning that it has type arguments.
bool isSpecializedAsWritten() const {
  return getObjectType()->isSpecializedAsWritten();
}

/// Whether this type is unspecialized, meaning that is has no type arguments.
bool isUnspecialized() const { return getObjectType()->isUnspecialized(); }

/// Determine whether this object type is "unspecialized" as
/// written, meaning that it has no type arguments.
bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }

/// Retrieve the type arguments for this type.
ArrayRef<QualType> getTypeArgs() const {
  return getObjectType()->getTypeArgs();
}

/// Retrieve the type arguments for this type.
ArrayRef<QualType> getTypeArgsAsWritten() const {
  return getObjectType()->getTypeArgsAsWritten();
}

/// An iterator over the qualifiers on the object type.  Provided
/// for convenience.  This will always iterate over the full set of
/// protocols on a type, not just those provided directly.
using qual_iterator = ObjCObjectType::qual_iterator;
using qual_range = llvm::iterator_range<qual_iterator>;

qual_range quals() const { return qual_range(qual_begin(), qual_end()); }

qual_iterator qual_begin() const {
  return getObjectType()->qual_begin();
}

qual_iterator qual_end() const {
  return getObjectType()->qual_end();
}

bool qual_empty() const { return getObjectType()->qual_empty(); }

/// Return the number of qualifying protocols on the object type.
unsigned getNumProtocols() const {
  return getObjectType()->getNumProtocols();
}

/// Retrieve a qualifying protocol by index on the object type.
ObjCProtocolDecl *getProtocol(unsigned I) const {
  return getObjectType()->getProtocol(I);
}

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

/// Retrieve the type of the superclass of this object pointer type.
///
/// This operation substitutes any type arguments into the
/// superclass of the current class type, potentially producing a
/// pointer to a specialization of the superclass type. Produces a
/// null type if there is no superclass.
QualType getSuperClassType() const;

/// Strip off the Objective-C "kindof" type and (with it) any
/// protocol qualifiers.
const ObjCObjectPointerType *stripObjCKindOfTypeAndQuals(
                               const ASTContext &ctx) const;

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getPointeeType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
  ID.AddPointer(T.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == ObjCObjectPointer;
}
6042};

6044class AtomicType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType ValueType;

AtomicType(QualType ValTy, QualType Canonical)
    : Type(Atomic, Canonical, ValTy->isDependentType(),
           ValTy->isInstantiationDependentType(),
           ValTy->isVariablyModifiedType(),
           ValTy->containsUnexpandedParameterPack()),
      ValueType(ValTy) {}

6056public:
/// Gets the type contained by this atomic type, i.e.
/// the type returned by performing an atomic load of this atomic type.
QualType getValueType() const { return ValueType; }

bool isSugared() const { return false; }
QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getValueType());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
  ID.AddPointer(T.getAsOpaquePtr());
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Atomic;
}
6075};

6077/// PipeType - OpenCL20.
6078class PipeType : public Type, public llvm::FoldingSetNode {
friend class ASTContext; // ASTContext creates these.

QualType ElementType;
bool isRead;

PipeType(QualType elemType, QualType CanonicalPtr, bool isRead)
    : Type(Pipe, CanonicalPtr, elemType->isDependentType(),
           elemType->isInstantiationDependentType(),
           elemType->isVariablyModifiedType(),
           elemType->containsUnexpandedParameterPack()),
      ElementType(elemType), isRead(isRead) {}

6091public:
QualType getElementType() const { return ElementType; }

bool isSugared() const { return false; }

QualType desugar() const { return QualType(this, 0); }

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, getElementType(), isReadOnly());
}

static void Profile(llvm::FoldingSetNodeID &ID, QualType T, bool isRead) {
  ID.AddPointer(T.getAsOpaquePtr());
  ID.AddBoolean(isRead);
}

static bool classof(const Type *T) {
  return T->getTypeClass() == Pipe;
}

bool isReadOnly() const { return isRead; }
6112};

6114/// A qualifier set is used to build a set of qualifiers.
6115class QualifierCollector : public Qualifiers {
6116public:
QualifierCollector(Qualifiers Qs = Qualifiers()) : Qualifiers(Qs) {}

/// Collect any qualifiers on the given type and return an
/// unqualified type.  The qualifiers are assumed to be consistent
/// with those already in the type.
const Type *strip(QualType type) {
  addFastQualifiers(type.getLocalFastQualifiers());
  if (!type.hasLocalNonFastQualifiers())
    return type.getTypePtrUnsafe();

  const ExtQuals *extQuals = type.getExtQualsUnsafe();
  addConsistentQualifiers(extQuals->getQualifiers());
  return extQuals->getBaseType();
}

/// Apply the collected qualifiers to the given type.
QualType apply(const ASTContext &Context, QualType QT) const;

/// Apply the collected qualifiers to the given type.
QualType apply(const ASTContext &Context, const Type* T) const;
6137};

6139// Inline function definitions.

6141inline SplitQualType SplitQualType::getSingleStepDesugaredType() const {
SplitQualType desugar =
  Ty->getLocallyUnqualifiedSingleStepDesugaredType().split();
desugar.Quals.addConsistentQualifiers(Quals);
return desugar;
6146}

6148inline const Type *QualType::getTypePtr() const {
return getCommonPtr()->BaseType;
6150}

6152inline const Type *QualType::getTypePtrOrNull() const {
return (isNull() ? nullptr : getCommonPtr()->BaseType);
6154}

6156inline SplitQualType QualType::split() const {
if (!hasLocalNonFastQualifiers())
  return SplitQualType(getTypePtrUnsafe(),
                       Qualifiers::fromFastMask(getLocalFastQualifiers()));

const ExtQuals *eq = getExtQualsUnsafe();
Qualifiers qs = eq->getQualifiers();
qs.addFastQualifiers(getLocalFastQualifiers());
return SplitQualType(eq->getBaseType(), qs);
6165}

6167inline Qualifiers QualType::getLocalQualifiers() const {
Qualifiers Quals;
if (hasLocalNonFastQualifiers())
  Quals = getExtQualsUnsafe()->getQualifiers();
Quals.addFastQualifiers(getLocalFastQualifiers());
return Quals;
6173}

6175inline Qualifiers QualType::getQualifiers() const {
Qualifiers quals = getCommonPtr()->CanonicalType.getLocalQualifiers();
quals.addFastQualifiers(getLocalFastQualifiers());
return quals;
6179}

6181inline unsigned QualType::getCVRQualifiers() const {
unsigned cvr = getCommonPtr()->CanonicalType.getLocalCVRQualifiers();
cvr |= getLocalCVRQualifiers();
return cvr;
6185}

6187inline QualType QualType::getCanonicalType() const {
QualType canon = getCommonPtr()->CanonicalType;
return canon.withFastQualifiers(getLocalFastQualifiers());
6190}

6192inline bool QualType::isCanonical() const {
return getTypePtr()->isCanonicalUnqualified();
6194}

6196inline bool QualType::isCanonicalAsParam() const {
if (!isCanonical()) return false;
if (hasLocalQualifiers()) return false;

const Type *T = getTypePtr();
if (T->isVariablyModifiedType() && T->hasSizedVLAType())
  return false;

return !isa<FunctionType>(T) && !isa<ArrayType>(T);
6205}

6207inline bool QualType::isConstQualified() const {
return isLocalConstQualified() ||
       getCommonPtr()->CanonicalType.isLocalConstQualified();
6210}

6212inline bool QualType::isRestrictQualified() const {
return isLocalRestrictQualified() ||
       getCommonPtr()->CanonicalType.isLocalRestrictQualified();
6215}


6218inline bool QualType::isVolatileQualified() const {
return isLocalVolatileQualified() ||
       getCommonPtr()->CanonicalType.isLocalVolatileQualified();
6221}

6223inline bool QualType::hasQualifiers() const {
return hasLocalQualifiers() ||
       getCommonPtr()->CanonicalType.hasLocalQualifiers();
6226}

6228inline QualType QualType::getUnqualifiedType() const {
if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
  return QualType(getTypePtr(), 0);

return QualType(getSplitUnqualifiedTypeImpl(*this).Ty, 0);
6233}

6235inline SplitQualType QualType::getSplitUnqualifiedType() const {
if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
  return split();

return getSplitUnqualifiedTypeImpl(*this);
6240}

6242inline void QualType::removeLocalConst() {
removeLocalFastQualifiers(Qualifiers::Const);
6244}

6246inline void QualType::removeLocalRestrict() {
removeLocalFastQualifiers(Qualifiers::Restrict);
6248}

6250inline void QualType::removeLocalVolatile() {
removeLocalFastQualifiers(Qualifiers::Volatile);
6252}

6254inline void QualType::removeLocalCVRQualifiers(unsigned Mask) {
assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits")((!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(Mask & ~Qualifiers::CVRMask) && \"mask has non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 6255, __PRETTY_FUNCTION__));
static_assert((int)Qualifiers::CVRMask == (int)Qualifiers::FastMask,
              "Fast bits differ from CVR bits!");

// Fast path: we don't need to touch the slow qualifiers.
removeLocalFastQualifiers(Mask);
6261}

6263/// Return the address space of this type.
6264inline LangAS QualType::getAddressSpace() const {
return getQualifiers().getAddressSpace();
6266}

6268/// Return the gc attribute of this type.
6269inline Qualifiers::GC QualType::getObjCGCAttr() const {
return getQualifiers().getObjCGCAttr();
6271}

6273inline bool QualType::hasNonTrivialToPrimitiveDefaultInitializeCUnion() const {
if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
  return hasNonTrivialToPrimitiveDefaultInitializeCUnion(RD);
return false;
6277}

6279inline bool QualType::hasNonTrivialToPrimitiveDestructCUnion() const {
if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
  return hasNonTrivialToPrimitiveDestructCUnion(RD);
return false;
6283}

6285inline bool QualType::hasNonTrivialToPrimitiveCopyCUnion() const {
if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
  return hasNonTrivialToPrimitiveCopyCUnion(RD);
return false;
6289}

6291inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) {
if (const auto *PT = t.getAs<PointerType>()) {
  if (const auto *FT = PT->getPointeeType()->getAs<FunctionType>())
    return FT->getExtInfo();
} else if (const auto *FT = t.getAs<FunctionType>())
  return FT->getExtInfo();

return FunctionType::ExtInfo();
6299}

6301inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) {
return getFunctionExtInfo(*t);
6303}

6305/// Determine whether this type is more
6306/// qualified than the Other type. For example, "const volatile int"
6307/// is more qualified than "const int", "volatile int", and
6308/// "int". However, it is not more qualified than "const volatile
6309/// int".
6310inline bool QualType::isMoreQualifiedThan(QualType other) const {
Qualifiers MyQuals = getQualifiers();
Qualifiers OtherQuals = other.getQualifiers();
return (MyQuals != OtherQuals && MyQuals.compatiblyIncludes(OtherQuals));
6314}

6316/// Determine whether this type is at last
6317/// as qualified as the Other type. For example, "const volatile
6318/// int" is at least as qualified as "const int", "volatile int",
6319/// "int", and "const volatile int".
6320inline bool QualType::isAtLeastAsQualifiedAs(QualType other) const {
Qualifiers OtherQuals = other.getQualifiers();

// Ignore __unaligned qualifier if this type is a void.
if (getUnqualifiedType()->isVoidType())
  OtherQuals.removeUnaligned();

return getQualifiers().compatiblyIncludes(OtherQuals);
6328}

6330/// If Type is a reference type (e.g., const
6331/// int&), returns the type that the reference refers to ("const
6332/// int"). Otherwise, returns the type itself. This routine is used
6333/// throughout Sema to implement C++ 5p6:
6334///
6335///   If an expression initially has the type "reference to T" (8.3.2,
6336///   8.5.3), the type is adjusted to "T" prior to any further
6337///   analysis, the expression designates the object or function
6338///   denoted by the reference, and the expression is an lvalue.
6339inline QualType QualType::getNonReferenceType() const {
if (const auto *RefType = (*this)->getAs<ReferenceType>())
  return RefType->getPointeeType();
else
  return *this;
6344}

6346inline bool QualType::isCForbiddenLValueType() const {
return ((getTypePtr()->isVoidType() && !hasQualifiers()) ||
        getTypePtr()->isFunctionType());
6349}

6351/// Tests whether the type is categorized as a fundamental type.
6352///
6353/// \returns True for types specified in C++0x [basic.fundamental].
6354inline bool Type::isFundamentalType() const {
return isVoidType() ||
       isNullPtrType() ||
       // FIXME: It's really annoying that we don't have an
       // 'isArithmeticType()' which agrees with the standard definition.
       (isArithmeticType() && !isEnumeralType());
6360}

6362/// Tests whether the type is categorized as a compound type.
6363///
6364/// \returns True for types specified in C++0x [basic.compound].
6365inline bool Type::isCompoundType() const {
// C++0x [basic.compound]p1:
//   Compound types can be constructed in the following ways:
//    -- arrays of objects of a given type [...];
return isArrayType() ||
//    -- functions, which have parameters of given types [...];
       isFunctionType() ||
//    -- pointers to void or objects or functions [...];
       isPointerType() ||
//    -- references to objects or functions of a given type. [...]
       isReferenceType() ||
//    -- classes containing a sequence of objects of various types, [...];
       isRecordType() ||
//    -- unions, which are classes capable of containing objects of different
//               types at different times;
       isUnionType() ||
//    -- enumerations, which comprise a set of named constant values. [...];
       isEnumeralType() ||
//    -- pointers to non-static class members, [...].
       isMemberPointerType();
6385}

6387inline bool Type::isFunctionType() const {
return isa<FunctionType>(CanonicalType);
6389}

6391inline bool Type::isPointerType() const {
return isa<PointerType>(CanonicalType);
16
←
Assuming field 'CanonicalType' is a 'PointerType'→
17
←
Returning the value 1, which participates in a condition later→
20
←
Assuming field 'CanonicalType' is a 'PointerType'→
21
←
Returning the value 1, which participates in a condition later→
6393}

6395inline bool Type::isAnyPointerType() const {
return isPointerType() || isObjCObjectPointerType();
6397}

6399inline bool Type::isBlockPointerType() const {
return isa<BlockPointerType>(CanonicalType);
6401}

6403inline bool Type::isReferenceType() const {
return isa<ReferenceType>(CanonicalType);
6405}

6407inline bool Type::isLValueReferenceType() const {
return isa<LValueReferenceType>(CanonicalType);
6409}

6411inline bool Type::isRValueReferenceType() const {
return isa<RValueReferenceType>(CanonicalType);
6413}

6415inline bool Type::isFunctionPointerType() const {
if (const auto *T = getAs<PointerType>())
  return T->getPointeeType()->isFunctionType();
else
  return false;
6420}

6422inline bool Type::isFunctionReferenceType() const {
if (const auto *T = getAs<ReferenceType>())
  return T->getPointeeType()->isFunctionType();
else
  return false;
6427}

6429inline bool Type::isMemberPointerType() const {
return isa<MemberPointerType>(CanonicalType);
6431}

6433inline bool Type::isMemberFunctionPointerType() const {
if (const auto *T = getAs<MemberPointerType>())
  return T->isMemberFunctionPointer();
else
  return false;
6438}

6440inline bool Type::isMemberDataPointerType() const {
if (const auto *T = getAs<MemberPointerType>())
  return T->isMemberDataPointer();
else
  return false;
6445}

6447inline bool Type::isArrayType() const {
return isa<ArrayType>(CanonicalType);
6449}

6451inline bool Type::isConstantArrayType() const {
return isa<ConstantArrayType>(CanonicalType);
6453}

6455inline bool Type::isIncompleteArrayType() const {
return isa<IncompleteArrayType>(CanonicalType);
6457}

6459inline bool Type::isVariableArrayType() const {
return isa<VariableArrayType>(CanonicalType);
6461}

6463inline bool Type::isDependentSizedArrayType() const {
return isa<DependentSizedArrayType>(CanonicalType);
6465}

6467inline bool Type::isBuiltinType() const {
return isa<BuiltinType>(CanonicalType);
6469}

6471inline bool Type::isRecordType() const {
return isa<RecordType>(CanonicalType);
6473}

6475inline bool Type::isEnumeralType() const {
return isa<EnumType>(CanonicalType);
6477}

6479inline bool Type::isAnyComplexType() const {
return isa<ComplexType>(CanonicalType);
6481}

6483inline bool Type::isVectorType() const {
return isa<VectorType>(CanonicalType);
6485}

6487inline bool Type::isExtVectorType() const {
return isa<ExtVectorType>(CanonicalType);
6489}

6491inline bool Type::isDependentAddressSpaceType() const {
return isa<DependentAddressSpaceType>(CanonicalType);
6493}

6495inline bool Type::isObjCObjectPointerType() const {
return isa<ObjCObjectPointerType>(CanonicalType);
6497}

6499inline bool Type::isObjCObjectType() const {
return isa<ObjCObjectType>(CanonicalType);
6501}

6503inline bool Type::isObjCObjectOrInterfaceType() const {
return isa<ObjCInterfaceType>(CanonicalType) ||
  isa<ObjCObjectType>(CanonicalType);
6506}

6508inline bool Type::isAtomicType() const {
return isa<AtomicType>(CanonicalType);
6510}

6512inline bool Type::isObjCQualifiedIdType() const {
if (const auto *OPT = getAs<ObjCObjectPointerType>())
  return OPT->isObjCQualifiedIdType();
return false;
6516}

6518inline bool Type::isObjCQualifiedClassType() const {
if (const auto *OPT = getAs<ObjCObjectPointerType>())
  return OPT->isObjCQualifiedClassType();
return false;
6522}

6524inline bool Type::isObjCIdType() const {
if (const auto *OPT = getAs<ObjCObjectPointerType>())
  return OPT->isObjCIdType();
return false;
6528}

6530inline bool Type::isObjCClassType() const {
if (const auto *OPT = getAs<ObjCObjectPointerType>())
  return OPT->isObjCClassType();
return false;
6534}

6536inline bool Type::isObjCSelType() const {
if (const auto *OPT = getAs<PointerType>())
  return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel);
return false;
6540}

6542inline bool Type::isObjCBuiltinType() const {
return isObjCIdType() || isObjCClassType() || isObjCSelType();
6544}

6546inline bool Type::isDecltypeType() const {
return isa<DecltypeType>(this);
6548}

6550#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
inline bool Type::is##Id##Type() const { \
  return isSpecificBuiltinType(BuiltinType::Id); \
}
6554#include "clang/Basic/OpenCLImageTypes.def"

6556inline bool Type::isSamplerT() const {
return isSpecificBuiltinType(BuiltinType::OCLSampler);
6558}

6560inline bool Type::isEventT() const {
return isSpecificBuiltinType(BuiltinType::OCLEvent);
6562}

6564inline bool Type::isClkEventT() const {
return isSpecificBuiltinType(BuiltinType::OCLClkEvent);
6566}

6568inline bool Type::isQueueT() const {
return isSpecificBuiltinType(BuiltinType::OCLQueue);
6570}

6572inline bool Type::isReserveIDT() const {
return isSpecificBuiltinType(BuiltinType::OCLReserveID);
6574}

6576inline bool Type::isImageType() const {
6577#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) is##Id##Type() ||
return
6579#include "clang/Basic/OpenCLImageTypes.def"
    false; // end boolean or operation
6581}

6583inline bool Type::isPipeType() const {
return isa<PipeType>(CanonicalType);
6585}

6587#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
inline bool Type::is##Id##Type() const { \
  return isSpecificBuiltinType(BuiltinType::Id); \
}
6591#include "clang/Basic/OpenCLExtensionTypes.def"

6593inline bool Type::isOCLIntelSubgroupAVCType() const {
6594#define INTEL_SUBGROUP_AVC_TYPE(ExtType, Id) \
isOCLIntelSubgroupAVC##Id##Type() ||
return
6597#include "clang/Basic/OpenCLExtensionTypes.def"
  false; // end of boolean or operation
6599}

6601inline bool Type::isOCLExtOpaqueType() const {
6602#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) is##Id##Type() ||
return
6604#include "clang/Basic/OpenCLExtensionTypes.def"
  false; // end of boolean or operation
6606}

6608inline bool Type::isOpenCLSpecificType() const {
return isSamplerT() || isEventT() || isImageType() || isClkEventT() ||
       isQueueT() || isReserveIDT() || isPipeType() || isOCLExtOpaqueType();
6611}

6613inline bool Type::isTemplateTypeParmType() const {
return isa<TemplateTypeParmType>(CanonicalType);
6615}

6617inline bool Type::isSpecificBuiltinType(unsigned K) const {
if (const BuiltinType *BT = getAs<BuiltinType>())
  if (BT->getKind() == (BuiltinType::Kind) K)
    return true;
return false;
6622}

6624inline bool Type::isPlaceholderType() const {
if (const auto *BT = dyn_cast<BuiltinType>(this))
  return BT->isPlaceholderType();
return false;
6628}

6630inline const BuiltinType *Type::getAsPlaceholderType() const {
if (const auto *BT = dyn_cast<BuiltinType>(this))
  if (BT->isPlaceholderType())
    return BT;
return nullptr;
6635}

6637inline bool Type::isSpecificPlaceholderType(unsigned K) const {
assert(BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K))((BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K)) ?
 static_cast<void> (0) : __assert_fail ("BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K)"
, "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 6638, __PRETTY_FUNCTION__));
if (const auto *BT = dyn_cast<BuiltinType>(this))
  return (BT->getKind() == (BuiltinType::Kind) K);
return false;
6642}

6644inline bool Type::isNonOverloadPlaceholderType() const {
if (const auto *BT = dyn_cast<BuiltinType>(this))
  return BT->isNonOverloadPlaceholderType();
return false;
6648}

6650inline bool Type::isVoidType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() == BuiltinType::Void;
return false;
6654}

6656inline bool Type::isHalfType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() == BuiltinType::Half;
// FIXME: Should we allow complex __fp16? Probably not.
return false;
6661}

6663inline bool Type::isFloat16Type() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() == BuiltinType::Float16;
return false;
6667}

6669inline bool Type::isFloat128Type() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() == BuiltinType::Float128;
return false;
6673}

6675inline bool Type::isNullPtrType() const {
if (const auto *BT = getAs<BuiltinType>())
  return BT->getKind() == BuiltinType::NullPtr;
return false;
6679}

6681bool IsEnumDeclComplete(EnumDecl *);
6682bool IsEnumDeclScoped(EnumDecl *);

6684inline bool Type::isIntegerType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() >= BuiltinType::Bool &&
         BT->getKind() <= BuiltinType::Int128;
if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
  // Incomplete enum types are not treated as integer types.
  // FIXME: In C++, enum types are never integer types.
  return IsEnumDeclComplete(ET->getDecl()) &&
    !IsEnumDeclScoped(ET->getDecl());
}
return false;
6695}

6697inline bool Type::isFixedPointType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
  return BT->getKind() >= BuiltinType::ShortAccum &&
         BT->getKind() <= BuiltinType::SatULongFract;
}
return false;
6703}

6705inline bool Type::isFixedPointOrIntegerType() const {
return isFixedPointType() || isIntegerType();
6707}

6709inline bool Type::isSaturatedFixedPointType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
  return BT->getKind() >= BuiltinType::SatShortAccum &&
         BT->getKind() <= BuiltinType::SatULongFract;
}
return false;
6715}

6717inline bool Type::isUnsaturatedFixedPointType() const {
return isFixedPointType() && !isSaturatedFixedPointType();
6719}

6721inline bool Type::isSignedFixedPointType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
  return ((BT->getKind() >= BuiltinType::ShortAccum &&
           BT->getKind() <= BuiltinType::LongAccum) ||
          (BT->getKind() >= BuiltinType::ShortFract &&
           BT->getKind() <= BuiltinType::LongFract) ||
          (BT->getKind() >= BuiltinType::SatShortAccum &&
           BT->getKind() <= BuiltinType::SatLongAccum) ||
          (BT->getKind() >= BuiltinType::SatShortFract &&
           BT->getKind() <= BuiltinType::SatLongFract));
}
return false;
6733}

6735inline bool Type::isUnsignedFixedPointType() const {
return isFixedPointType() && !isSignedFixedPointType();
6737}

6739inline bool Type::isScalarType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() > BuiltinType::Void &&
         BT->getKind() <= BuiltinType::NullPtr;
if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType))
  // Enums are scalar types, but only if they are defined.  Incomplete enums
  // are not treated as scalar types.
  return IsEnumDeclComplete(ET->getDecl());
return isa<PointerType>(CanonicalType) ||
       isa<BlockPointerType>(CanonicalType) ||
       isa<MemberPointerType>(CanonicalType) ||
       isa<ComplexType>(CanonicalType) ||
       isa<ObjCObjectPointerType>(CanonicalType);
6752}

6754inline bool Type::isIntegralOrEnumerationType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() >= BuiltinType::Bool &&
         BT->getKind() <= BuiltinType::Int128;

// Check for a complete enum type; incomplete enum types are not properly an
// enumeration type in the sense required here.
if (const auto *ET = dyn_cast<EnumType>(CanonicalType))
  return IsEnumDeclComplete(ET->getDecl());

return false;
6765}

6767inline bool Type::isBooleanType() const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
  return BT->getKind() == BuiltinType::Bool;
return false;
6771}

6773inline bool Type::isUndeducedType() const {
auto *DT = getContainedDeducedType();
return DT && !DT->isDeduced();
6776}

6778/// Determines whether this is a type for which one can define
6779/// an overloaded operator.
6780inline bool Type::isOverloadableType() const {
return isDependentType() || isRecordType() || isEnumeralType();
6782}

6784/// Determines whether this type can decay to a pointer type.
6785inline bool Type::canDecayToPointerType() const {
return isFunctionType() || isArrayType();
6787}

6789inline bool Type::hasPointerRepresentation() const {
return (isPointerType() || isReferenceType() || isBlockPointerType() ||
        isObjCObjectPointerType() || isNullPtrType());
6792}

6794inline bool Type::hasObjCPointerRepresentation() const {
return isObjCObjectPointerType();
6796}

6798inline const Type *Type::getBaseElementTypeUnsafe() const {
const Type *type = this;
while (const ArrayType *arrayType = type->getAsArrayTypeUnsafe())
  type = arrayType->getElementType().getTypePtr();
return type;
6803}

6805inline const Type *Type::getPointeeOrArrayElementType() const {
const Type *type = this;
if (type->isAnyPointerType())
  return type->getPointeeType().getTypePtr();
else if (type->isArrayType())
  return type->getBaseElementTypeUnsafe();
return type;
6812}

6814/// Insertion operator for diagnostics. This allows sending Qualifiers into a
6815/// diagnostic with <<.
6816inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         Qualifiers Q) {
DB.AddTaggedVal(Q.getAsOpaqueValue(),
                DiagnosticsEngine::ArgumentKind::ak_qual);
return DB;
6821}

6823/// Insertion operator for partial diagnostics. This allows sending Qualifiers
6824/// into a diagnostic with <<.
6825inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                         Qualifiers Q) {
PD.AddTaggedVal(Q.getAsOpaqueValue(),
                DiagnosticsEngine::ArgumentKind::ak_qual);
return PD;
6830}

6832/// Insertion operator for diagnostics.  This allows sending QualType's into a
6833/// diagnostic with <<.
6834inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         QualType T) {
DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()),
                DiagnosticsEngine::ak_qualtype);
return DB;
6839}

6841/// Insertion operator for partial diagnostics.  This allows sending QualType's
6842/// into a diagnostic with <<.
6843inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                         QualType T) {
PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()),
                DiagnosticsEngine::ak_qualtype);
return PD;
6848}

6850// Helper class template that is used by Type::getAs to ensure that one does
6851// not try to look through a qualified type to get to an array type.
6852template <typename T>
6853using TypeIsArrayType =
  std::integral_constant<bool, std::is_same<T, ArrayType>::value ||
                                   std::is_base_of<ArrayType, T>::value>;

6857// Member-template getAs<specific type>'.
6858template <typename T> const T *Type::getAs() const {
static_assert(!TypeIsArrayType<T>::value,
              "ArrayType cannot be used with getAs!");

// If this is directly a T type, return it.
if (const auto *Ty = dyn_cast<T>(this))
  return Ty;

// If the canonical form of this type isn't the right kind, reject it.
if (!isa<T>(CanonicalType))
  return nullptr;

// If this is a typedef for the type, strip the typedef off without
// losing all typedef information.
return cast<T>(getUnqualifiedDesugaredType());
6873}

6875template <typename T> const T *Type::getAsAdjusted() const {
static_assert(!TypeIsArrayType<T>::value, "ArrayType cannot be used with getAsAdjusted!");

// If this is directly a T type, return it.
if (const auto *Ty = dyn_cast<T>(this))
  return Ty;

// If the canonical form of this type isn't the right kind, reject it.
if (!isa<T>(CanonicalType))
  return nullptr;

// Strip off type adjustments that do not modify the underlying nature of the
// type.
const Type *Ty = this;
while (Ty) {
  if (const auto *A = dyn_cast<AttributedType>(Ty))
    Ty = A->getModifiedType().getTypePtr();
  else if (const auto *E = dyn_cast<ElaboratedType>(Ty))
    Ty = E->desugar().getTypePtr();
  else if (const auto *P = dyn_cast<ParenType>(Ty))
    Ty = P->desugar().getTypePtr();
  else if (const auto *A = dyn_cast<AdjustedType>(Ty))
    Ty = A->desugar().getTypePtr();
  else if (const auto *M = dyn_cast<MacroQualifiedType>(Ty))
    Ty = M->desugar().getTypePtr();
  else
    break;
}

// Just because the canonical type is correct does not mean we can use cast<>,
// since we may not have stripped off all the sugar down to the base type.
return dyn_cast<T>(Ty);
6907}

6909inline const ArrayType *Type::getAsArrayTypeUnsafe() const {
// If this is directly an array type, return it.
if (const auto *arr = dyn_cast<ArrayType>(this))
  return arr;

// If the canonical form of this type isn't the right kind, reject it.
if (!isa<ArrayType>(CanonicalType))
  return nullptr;

// If this is a typedef for the type, strip the typedef off without
// losing all typedef information.
return cast<ArrayType>(getUnqualifiedDesugaredType());
6921}

6923template <typename T> const T *Type::castAs() const {
static_assert(!TypeIsArrayType<T>::value,
              "ArrayType cannot be used with castAs!");

if (const auto *ty = dyn_cast<T>(this)) return ty;
assert(isa<T>(CanonicalType))((isa<T>(CanonicalType)) ? static_cast<void> (0) :
 __assert_fail ("isa<T>(CanonicalType)", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 6928, __PRETTY_FUNCTION__));
return cast<T>(getUnqualifiedDesugaredType());
6930}

6932inline const ArrayType *Type::castAsArrayTypeUnsafe() const {
assert(isa<ArrayType>(CanonicalType))((isa<ArrayType>(CanonicalType)) ? static_cast<void>
 (0) : __assert_fail ("isa<ArrayType>(CanonicalType)", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 6933, __PRETTY_FUNCTION__));
if (const auto *arr = dyn_cast<ArrayType>(this)) return arr;
return cast<ArrayType>(getUnqualifiedDesugaredType());
6936}

6938DecayedType::DecayedType(QualType OriginalType, QualType DecayedPtr,
                       QualType CanonicalPtr)
  : AdjustedType(Decayed, OriginalType, DecayedPtr, CanonicalPtr) {
6941#ifndef NDEBUG
QualType Adjusted = getAdjustedType();
(void)AttributedType::stripOuterNullability(Adjusted);
assert(isa<PointerType>(Adjusted))((isa<PointerType>(Adjusted)) ? static_cast<void>
 (0) : __assert_fail ("isa<PointerType>(Adjusted)", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/AST/Type.h"
, 6944, __PRETTY_FUNCTION__));
6945#endif
6946}

6948QualType DecayedType::getPointeeType() const {
QualType Decayed = getDecayedType();
(void)AttributedType::stripOuterNullability(Decayed);
return cast<PointerType>(Decayed)->getPointeeType();
6952}

6954// Get the decimal string representation of a fixed point type, represented
6955// as a scaled integer.
6956// TODO: At some point, we should change the arguments to instead just accept an
6957// APFixedPoint instead of APSInt and scale.
6958void FixedPointValueToString(SmallVectorImpl<char> &Str, llvm::APSInt Val,
                           unsigned Scale);

6961} // namespace clang

6963#endif // LLVM_CLANG_AST_TYPE_H