/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp

Bug Summary

File:	clang/lib/AST/ExprConstant.cpp
Warning:	line 7914, column 32 Access to field 'Index' results in a dereference of a null pointer (loaded from field 'CurrentCall')

Annotated Source Code

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clang -cc1 -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 -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -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-12~++20200927111121+5811d723998/build-llvm/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST -I /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include -I /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/llvm/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-12/lib/clang/12.0.0/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-12~++20200927111121+5811d723998/build-llvm/tools/clang/lib/AST -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-09-28-092409-31635-1 -x c++ /build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp

/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/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 "Interp/Context.h"
36#include "Interp/Frame.h"
37#include "Interp/State.h"
38#include "clang/AST/APValue.h"
39#include "clang/AST/ASTContext.h"
40#include "clang/AST/ASTDiagnostic.h"
41#include "clang/AST/ASTLambda.h"
42#include "clang/AST/Attr.h"
43#include "clang/AST/CXXInheritance.h"
44#include "clang/AST/CharUnits.h"
45#include "clang/AST/CurrentSourceLocExprScope.h"
46#include "clang/AST/Expr.h"
47#include "clang/AST/OSLog.h"
48#include "clang/AST/OptionalDiagnostic.h"
49#include "clang/AST/RecordLayout.h"
50#include "clang/AST/StmtVisitor.h"
51#include "clang/AST/TypeLoc.h"
52#include "clang/Basic/Builtins.h"
53#include "clang/Basic/TargetInfo.h"
54#include "llvm/ADT/APFixedPoint.h"
55#include "llvm/ADT/Optional.h"
56#include "llvm/ADT/SmallBitVector.h"
57#include "llvm/Support/Debug.h"
58#include "llvm/Support/SaveAndRestore.h"
59#include "llvm/Support/raw_ostream.h"
60#include <cstring>
61#include <functional>

63#define DEBUG_TYPE"exprconstant" "exprconstant"

65using namespace clang;
66using llvm::APFixedPoint;
67using llvm::APInt;
68using llvm::APSInt;
69using llvm::APFloat;
70using llvm::FixedPointSemantics;
71using llvm::Optional;

73namespace {
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->getSubExpr();
    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(const ASTContext &Ctx, const 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 204, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 204, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 218, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 291, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 313, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 314, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 337, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 344, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 350, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 391, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 476, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 484, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 484, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 568, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 568, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 568, __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; }

  bool isStdFunction() const {
    for (const DeclContext *DC = Callee; DC; DC = DC->getParent())
      if (DC->isStdNamespace())
        return true;
    return false;
  }
};

/// 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;
};
625}

627static bool HandleDestruction(EvalInfo &Info, const Expr *E,
                            const LValue &This, QualType ThisType);
629static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc,
                            APValue::LValueBase LVBase, APValue &Value,
                            QualType T);

633namespace {
/// 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,
  AfterFields,
  Destroying,
  DestroyingBases
};
684}

686namespace llvm {
687template<> 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;
}
701};
702}

704namespace {
/// A dynamically-allocated heap object.
struct DynAlloc {
  /// The value of this heap-allocated object.
  APValue Value;
  /// The allocating expression; used for diagnostics. Either a CXXNewExpr
  /// or a CallExpr (the latter is for direct calls to operator new inside
  /// std::allocator<T>::allocate).
  const Expr *AllocExpr = nullptr;

  enum Kind {
    New,
    ArrayNew,
    StdAllocator
  };

  /// Get the kind of the allocation. This must match between allocation
  /// and deallocation.
  Kind getKind() const {
    if (auto *NE = dyn_cast<CXXNewExpr>(AllocExpr))
      return NE->isArray() ? ArrayNew : New;
    assert(isa<CallExpr>(AllocExpr))((isa<CallExpr>(AllocExpr)) ? static_cast<void> (
0) : __assert_fail ("isa<CallExpr>(AllocExpr)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 725, __PRETTY_FUNCTION__));
    return StdAllocator;
  }
};

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

/// 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;

  /// Enable the experimental new constant interpreter. If an expression is
  /// not supported by the interpreter, an error is triggered.
  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;

  /// 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;
    }
    void finishedConstructingFields() {
      EI.ObjectsUnderConstruction[Object] = ConstructionPhase::AfterFields;
    }
    ~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(C.getLangOpts().ConstexprStepLimit),
        EnableNewConstInterp(C.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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 967, __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;
  }

  /// Information about a stack frame for std::allocator<T>::[de]allocate.
  struct StdAllocatorCaller {
    unsigned FrameIndex;
    QualType ElemType;
    explicit operator bool() const { return FrameIndex != 0; };
  };

  StdAllocatorCaller getStdAllocatorCaller(StringRef FnName) const {
    for (const CallStackFrame *Call = CurrentCall; Call != &BottomFrame;
         Call = Call->Caller) {
      const auto *MD = dyn_cast_or_null<CXXMethodDecl>(Call->Callee);
      if (!MD)
        continue;
      const IdentifierInfo *FnII = MD->getIdentifier();
      if (!FnII || !FnII->isStr(FnName))
        continue;

      const auto *CTSD =
          dyn_cast<ClassTemplateSpecializationDecl>(MD->getParent());
      if (!CTSD)
        continue;

      const IdentifierInfo *ClassII = CTSD->getIdentifier();
      const TemplateArgumentList &TAL = CTSD->getTemplateArgs();
      if (CTSD->isInStdNamespace() && ClassII &&
          ClassII->isStr("allocator") && TAL.size() >= 1 &&
          TAL[0].getKind() == TemplateArgument::Type)
        return {Call->Index, TAL[0].getAsType()};
    }

    return {};
  }

  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() && !noteSideEffect()) {
        CleanupStack.clear();
        return false;
      }
    }
    CleanupStack.clear();
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1112);
  }

  /// 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1133);
  }

  /// 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1158);
  }

  /// 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1314, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1314, __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;
1341}

1343bool 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;
1357}

1359void 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.
1364}

1366void 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();
1379}

1381CallStackFrame::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;
1388}

1390CallStackFrame::~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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1391, __PRETTY_FUNCTION__));
--Info.CallStackDepth;
Info.CurrentCall = Caller;
1394}

1396static bool isRead(AccessKinds AK) {
return AK == AK_Read || AK == AK_ReadObjectRepresentation;
1398}

1400static 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_Construct:
case AK_Destroy:
  return true;
}
llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1415);
1416}

1418static bool isAnyAccess(AccessKinds AK) {
return isRead(AK) || isModification(AK);
1420}

1422/// Is this an access per the C++ definition?
1423static bool isFormalAccess(AccessKinds AK) {
return isAnyAccess(AK) && AK != AK_Construct && AK != AK_Destroy;
1425}

1427/// Is this kind of axcess valid on an indeterminate object value?
1428static bool isValidIndeterminateAccess(AccessKinds AK) {
switch (AK) {
case AK_Read:
case AK_Increment:
case AK_Decrement:
  // These need the object's value.
  return false;

case AK_ReadObjectRepresentation:
case AK_Assign:
case AK_Construct:
case AK_Destroy:
  // Construction and destruction don't need the value.
  return true;

case AK_MemberCall:
case AK_DynamicCast:
case AK_TypeId:
  // These aren't really meaningful on scalars.
  return true;
}
llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1449);
1450}

1452namespace {
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1480, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1514, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1520, __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) {
1529#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1534, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1534, __PRETTY_FUNCTION__));
    }
1536#endif

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

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

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

  std::string toString(ASTContext &Ctx, QualType T) const {
    APValue Printable;
    moveInto(Printable);
    return Printable.getAsString(Ctx, T);
  }

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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1613, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1679, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1698, __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;
}
1752}

1754static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E);
1755static bool EvaluateInPlace(APValue &Result, EvalInfo &Info,
                          const LValue &This, const Expr *E,
                          bool AllowNonLiteralTypes = false);
1758static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info,
                         bool InvalidBaseOK = false);
1760static bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info,
                          bool InvalidBaseOK = false);
1762static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result,
                                EvalInfo &Info);
1764static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info);
1765static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info);
1766static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result,
                                  EvalInfo &Info);
1768static bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info);
1769static bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info);
1770static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result,
                         EvalInfo &Info);
1772static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result);

1774/// Evaluate an integer or fixed point expression into an APResult.
1775static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result,
                                      EvalInfo &Info);

1778/// Evaluate only a fixed point expression into an APResult.
1779static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result,
                             EvalInfo &Info);

1782//===----------------------------------------------------------------------===//
1783// Misc utilities
1784//===----------------------------------------------------------------------===//

1786/// Negate an APSInt in place, converting it to a signed form if necessary, and
1787/// preserving its value (by extending by up to one bit as needed).
1788static void negateAsSigned(APSInt &Int) {
if (Int.isUnsigned() || Int.isMinSignedValue()) {
  Int = Int.extend(Int.getBitWidth() + 1);
  Int.setIsSigned(true);
}
Int = -Int;
1794}

1796template<typename KeyT>
1797APValue &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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1803, __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;
1816}

1818APValue *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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1828, __PRETTY_FUNCTION__));
Result.first->second.AllocExpr = E;
return &Result.first->second.Value;
1831}

1833/// Produce a string describing the given constexpr call.
1834void 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 << ')';
1867}

1869/// Evaluate an expression to see if it had side-effects, and discard its
1870/// result.
1871/// \return \c true if the caller should keep evaluating.
1872static 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;
1878}

1880/// Should this call expression be treated as a string literal?
1881static bool IsStringLiteralCall(const CallExpr *E) {
unsigned Builtin = E->getBuiltinCallee();
return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString ||
        Builtin == Builtin::BI__builtin___NSStringMakeConstantString);
1885}

1887static 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,
  // ... the address of a GUID [MS extension],
  return isa<FunctionDecl>(D) || isa<MSGuidDecl>(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:
  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;
}
1945}

1947static const ValueDecl *GetLValueBaseDecl(const LValue &LVal) {
return LVal.Base.dyn_cast<const ValueDecl*>();
1949}

1951static bool IsLiteralLValue(const LValue &Value) {
if (Value.getLValueCallIndex())
  return false;
const Expr *E = Value.Base.dyn_cast<const Expr*>();
return E && !isa<MaterializeTemporaryExpr>(E);
1956}

1958static bool IsWeakLValue(const LValue &Value) {
const ValueDecl *Decl = GetLValueBaseDecl(Value);
return Decl && Decl->isWeak();
1961}

1963static 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;
1972}

1974static bool HasSameBase(const LValue &A, const LValue &B) {
if (!A.getLValueBase())
  return !B.getLValueBase();
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());
1993}

1995static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 1996, __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<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.
2009}

2011enum class CheckEvaluationResultKind {
ConstantExpression,
FullyInitialized,
2014};

2016/// Materialized temporaries that we've already checked to determine if they're
2017/// initializsed by a constant expression.
2018using CheckedTemporaries =
  llvm::SmallPtrSet<const MaterializeTemporaryExpr *, 8>;

2021static bool CheckEvaluationResult(CheckEvaluationResultKind CERK,
                                EvalInfo &Info, SourceLocation DiagLoc,
                                QualType Type, const APValue &Value,
                                Expr::ConstExprUsage Usage,
                                SourceLocation SubobjectLoc,
                                CheckedTemporaries &CheckedTemps);

2028/// Check that this reference or pointer core constant expression is a valid
2029/// value for an address or reference constant expression. Return true if we
2030/// can fold this expression, whether or not it's a constant expression.
2031static 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();

if (auto *VD = LVal.getLValueBase().dyn_cast<const ValueDecl *>()) {
  if (auto *FD = dyn_cast<FunctionDecl>(VD)) {
    if (FD->isConsteval()) {
      Info.FFDiag(Loc, diag::note_consteval_address_accessible)
          << !Type->isAnyPointerType();
      Info.Note(FD->getLocation(), diag::note_declared_at);
      return false;
    }
  }
}

// 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;

    auto *VarD = dyn_cast_or_null<VarDecl>(VD);
    if (VarD && VarD->isConstexpr()) {
      // Non-static local constexpr variables have unintuitive semantics:
      //   constexpr int a = 1;
      //   constexpr const int *p = &a;
      // ... is invalid because the address of 'a' is not constant. Suggest
      // adding a 'static' in this case.
      Info.Note(VarD->getLocation(), diag::note_constexpr_not_static)
          << VarD
          << FixItHint::CreateInsertion(VarD->getBeginLoc(), "static ");
    } else {
      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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2082, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2082, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2082, __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 = MTE->getOrCreateValue(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2131, __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;
2160}

2162/// Member pointers are constant expressions unless they point to a
2163/// non-virtual dllimport member function.
2164static 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;
if (FD->isConsteval()) {
  Info.FFDiag(Loc, diag::note_consteval_address_accessible) << /*pointer*/ 0;
  Info.Note(FD->getLocation(), diag::note_declared_at);
  return false;
}
return Usage == Expr::EvaluateForMangling || FD->isVirtual() ||
       !FD->hasAttr<DLLImportAttr>();
2180}

2182/// Check that this core constant expression is of literal type, and if not,
2183/// produce an appropriate diagnostic.
2184static 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;
2212}

2214static 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;
2293}

2295/// Check that this core constant expression value is a valid value for a
2296/// constant expression. If not, report an appropriate diagnostic. Does not
2297/// check that the expression is of literal type.
2298static bool
2299CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, QualType Type,
                      const APValue &Value,
                      Expr::ConstExprUsage Usage = Expr::EvaluateForCodeGen) {
// Nothing to check for a constant expression of type 'cv void'.
if (Type->isVoidType())
  return true;

CheckedTemporaries CheckedTemps;
return CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression,
                             Info, DiagLoc, Type, Value, Usage,
                             SourceLocation(), CheckedTemps);
2310}

2312/// Check that this evaluated value is fully-initialized and can be loaded by
2313/// an lvalue-to-rvalue conversion.
2314static 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);
2320}

2322/// Enforce C++2a [expr.const]/4.17, which disallows new-expressions unless
2323/// "the allocated storage is deallocated within the evaluation".
2324static 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;
2334}

2336static 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();
2349}

2351static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2386);
2387}

2389static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2391, __PRETTY_FUNCTION__));
APValue Val;
if (!Evaluate(Val, Info, E))
  return false;
return HandleConversionToBool(Val, Result);
2396}

2398template<typename T>
2399static bool HandleOverflow(EvalInfo &Info, const Expr *E,
                         const T &SrcValue, QualType DestType) {
Info.CCEDiag(E, diag::note_constexpr_overflow)
  << SrcValue << DestType;
return Info.noteUndefinedBehavior();
2404}

2406static 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;
2419}

2421/// Get rounding mode used for evaluation of the specified expression.
2422/// \param[out] DynamicRM Is set to true is the requested rounding mode is
2423///                       dynamic.
2424/// If rounding mode is unknown at compile time, still try to evaluate the
2425/// expression. If the result is exact, it does not depend on rounding mode.
2426/// So return "tonearest" mode instead of "dynamic".
2427static llvm::RoundingMode getActiveRoundingMode(EvalInfo &Info, const Expr *E,
                                              bool &DynamicRM) {
llvm::RoundingMode RM =
    E->getFPFeaturesInEffect(Info.Ctx.getLangOpts()).getRoundingMode();
DynamicRM = (RM == llvm::RoundingMode::Dynamic);
if (DynamicRM)
  RM = llvm::RoundingMode::NearestTiesToEven;
return RM;
2435}

2437/// Check if the given evaluation result is allowed for constant evaluation.
2438static bool checkFloatingPointResult(EvalInfo &Info, const Expr *E,
                                   APFloat::opStatus St) {
FPOptions FPO = E->getFPFeaturesInEffect(Info.Ctx.getLangOpts());
if ((St & APFloat::opInexact) &&
    FPO.getRoundingMode() == llvm::RoundingMode::Dynamic) {
  // Inexact result means that it depends on rounding mode. If the requested
  // mode is dynamic, the evaluation cannot be made in compile time.
  Info.FFDiag(E, diag::note_constexpr_dynamic_rounding);
  return false;
}

if (St & APFloat::opStatus::opInvalidOp) {
  // There is no usefully definable result.
  Info.FFDiag(E);
  return false;
}

// FIXME: if:
// - evaluation triggered other FP exception, and
// - exception mode is not "ignore", and
// - the expression being evaluated is not a part of global variable
//   initializer,
// the evaluation probably need to be rejected.
return true;
2462}

2464static bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E,
                                 QualType SrcType, QualType DestType,
                                 APFloat &Result) {
assert(isa<CastExpr>(E) || isa<CompoundAssignOperator>(E))((isa<CastExpr>(E) || isa<CompoundAssignOperator>
(E)) ? static_cast<void> (0) : __assert_fail ("isa<CastExpr>(E) || isa<CompoundAssignOperator>(E)"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2467, __PRETTY_FUNCTION__));
bool DynamicRM;
llvm::RoundingMode RM = getActiveRoundingMode(Info, E, DynamicRM);
APFloat::opStatus St;
APFloat Value = Result;
bool ignored;
St = Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), RM, &ignored);
return checkFloatingPointResult(Info, E, St);
2475}

2477static 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;
2488}

2490static 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;
2497}

2499static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2501, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2507, __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;
2518}

2520static 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;
2565}

2567/// Perform the given integer operation, which is known to need at most BitWidth
2568/// bits, and check for overflow in the original type (if that type was not an
2569/// unsigned type).
2570template<typename Operation>
2571static 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;
2591}

2593/// Perform the given binary integer operation.
2594static 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().CPlusPlus20) {
    // 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2691);
}
2693}

2695/// Perform the given binary floating-point operation, in-place, on LHS.
2696static bool handleFloatFloatBinOp(EvalInfo &Info, const BinaryOperator *E,
                                APFloat &LHS, BinaryOperatorKind Opcode,
                                const APFloat &RHS) {
bool DynamicRM;
llvm::RoundingMode RM = getActiveRoundingMode(Info, E, DynamicRM);
APFloat::opStatus St;
switch (Opcode) {
default:
  Info.FFDiag(E);
  return false;
case BO_Mul:
  St = LHS.multiply(RHS, RM);
  break;
case BO_Add:
  St = LHS.add(RHS, RM);
  break;
case BO_Sub:
  St = LHS.subtract(RHS, RM);
  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);
  St = LHS.divide(RHS, RM);
  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 checkFloatingPointResult(Info, E, St);
2734}

2736static bool handleLogicalOpForVector(const APInt &LHSValue,
                                   BinaryOperatorKind Opcode,
                                   const APInt &RHSValue, APInt &Result) {
bool LHS = (LHSValue != 0);
bool RHS = (RHSValue != 0);

if (Opcode == BO_LAnd)
  Result = LHS && RHS;
else
  Result = LHS || RHS;
return true;
2747}
2748static bool handleLogicalOpForVector(const APFloat &LHSValue,
                                   BinaryOperatorKind Opcode,
                                   const APFloat &RHSValue, APInt &Result) {
bool LHS = !LHSValue.isZero();
bool RHS = !RHSValue.isZero();

if (Opcode == BO_LAnd)
  Result = LHS && RHS;
else
  Result = LHS || RHS;
return true;
2759}

2761static bool handleLogicalOpForVector(const APValue &LHSValue,
                                   BinaryOperatorKind Opcode,
                                   const APValue &RHSValue, APInt &Result) {
// The result is always an int type, however operands match the first.
if (LHSValue.getKind() == APValue::Int)
  return handleLogicalOpForVector(LHSValue.getInt(), Opcode,
                                  RHSValue.getInt(), Result);
assert(LHSValue.getKind() == APValue::Float && "Should be no other options")((LHSValue.getKind() == APValue::Float && "Should be no other options"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.getKind() == APValue::Float && \"Should be no other options\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2768, __PRETTY_FUNCTION__));
return handleLogicalOpForVector(LHSValue.getFloat(), Opcode,
                                RHSValue.getFloat(), Result);
2771}

2773template <typename APTy>
2774static bool
2775handleCompareOpForVectorHelper(const APTy &LHSValue, BinaryOperatorKind Opcode,
                             const APTy &RHSValue, APInt &Result) {
switch (Opcode) {
default:
  llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2779);
case BO_EQ:
  Result = (LHSValue == RHSValue);
  break;
case BO_NE:
  Result = (LHSValue != RHSValue);
  break;
case BO_LT:
  Result = (LHSValue < RHSValue);
  break;
case BO_GT:
  Result = (LHSValue > RHSValue);
  break;
case BO_LE:
  Result = (LHSValue <= RHSValue);
  break;
case BO_GE:
  Result = (LHSValue >= RHSValue);
  break;
}

return true;
2801}

2803static bool handleCompareOpForVector(const APValue &LHSValue,
                                   BinaryOperatorKind Opcode,
                                   const APValue &RHSValue, APInt &Result) {
// The result is always an int type, however operands match the first.
if (LHSValue.getKind() == APValue::Int)
  return handleCompareOpForVectorHelper(LHSValue.getInt(), Opcode,
                                        RHSValue.getInt(), Result);
assert(LHSValue.getKind() == APValue::Float && "Should be no other options")((LHSValue.getKind() == APValue::Float && "Should be no other options"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.getKind() == APValue::Float && \"Should be no other options\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2810, __PRETTY_FUNCTION__));
return handleCompareOpForVectorHelper(LHSValue.getFloat(), Opcode,
                                      RHSValue.getFloat(), Result);
2813}

2815// Perform binary operations for vector types, in place on the LHS.
2816static bool handleVectorVectorBinOp(EvalInfo &Info, const BinaryOperator *E,
                                  BinaryOperatorKind Opcode,
                                  APValue &LHSValue,
                                  const APValue &RHSValue) {
assert(Opcode != BO_PtrMemD && Opcode != BO_PtrMemI &&((Opcode != BO_PtrMemD && Opcode != BO_PtrMemI &&
 "Operation not supported on vector types") ? static_cast<
void> (0) : __assert_fail ("Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && \"Operation not supported on vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2821, __PRETTY_FUNCTION__))
       "Operation not supported on vector types")((Opcode != BO_PtrMemD && Opcode != BO_PtrMemI &&
 "Operation not supported on vector types") ? static_cast<
void> (0) : __assert_fail ("Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && \"Operation not supported on vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2821, __PRETTY_FUNCTION__));

const auto *VT = E->getType()->castAs<VectorType>();
unsigned NumElements = VT->getNumElements();
QualType EltTy = VT->getElementType();

// In the cases (typically C as I've observed) where we aren't evaluating
// constexpr but are checking for cases where the LHS isn't yet evaluatable,
// just give up.
if (!LHSValue.isVector()) {
  assert(LHSValue.isLValue() &&((LHSValue.isLValue() && "A vector result that isn't a vector OR uncalculated LValue"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.isLValue() && \"A vector result that isn't a vector OR uncalculated LValue\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2832, __PRETTY_FUNCTION__))
         "A vector result that isn't a vector OR uncalculated LValue")((LHSValue.isLValue() && "A vector result that isn't a vector OR uncalculated LValue"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.isLValue() && \"A vector result that isn't a vector OR uncalculated LValue\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2832, __PRETTY_FUNCTION__));
  Info.FFDiag(E);
  return false;
}

assert(LHSValue.getVectorLength() == NumElements &&((LHSValue.getVectorLength() == NumElements && RHSValue
.getVectorLength() == NumElements && "Different vector sizes"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && \"Different vector sizes\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2838, __PRETTY_FUNCTION__))
       RHSValue.getVectorLength() == NumElements && "Different vector sizes")((LHSValue.getVectorLength() == NumElements && RHSValue
.getVectorLength() == NumElements && "Different vector sizes"
) ? static_cast<void> (0) : __assert_fail ("LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && \"Different vector sizes\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2838, __PRETTY_FUNCTION__));

SmallVector<APValue, 4> ResultElements;

for (unsigned EltNum = 0; EltNum < NumElements; ++EltNum) {
  APValue LHSElt = LHSValue.getVectorElt(EltNum);
  APValue RHSElt = RHSValue.getVectorElt(EltNum);

  if (EltTy->isIntegerType()) {
    APSInt EltResult{Info.Ctx.getIntWidth(EltTy),
                     EltTy->isUnsignedIntegerType()};
    bool Success = true;

    if (BinaryOperator::isLogicalOp(Opcode))
      Success = handleLogicalOpForVector(LHSElt, Opcode, RHSElt, EltResult);
    else if (BinaryOperator::isComparisonOp(Opcode))
      Success = handleCompareOpForVector(LHSElt, Opcode, RHSElt, EltResult);
    else
      Success = handleIntIntBinOp(Info, E, LHSElt.getInt(), Opcode,
                                  RHSElt.getInt(), EltResult);

    if (!Success) {
      Info.FFDiag(E);
      return false;
    }
    ResultElements.emplace_back(EltResult);

  } else if (EltTy->isFloatingType()) {
    assert(LHSElt.getKind() == APValue::Float &&((LHSElt.getKind() == APValue::Float && RHSElt.getKind
() == APValue::Float && "Mismatched LHS/RHS/Result Type"
) ? static_cast<void> (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2868, __PRETTY_FUNCTION__))
           RHSElt.getKind() == APValue::Float &&((LHSElt.getKind() == APValue::Float && RHSElt.getKind
() == APValue::Float && "Mismatched LHS/RHS/Result Type"
) ? static_cast<void> (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2868, __PRETTY_FUNCTION__))
           "Mismatched LHS/RHS/Result Type")((LHSElt.getKind() == APValue::Float && RHSElt.getKind
() == APValue::Float && "Mismatched LHS/RHS/Result Type"
) ? static_cast<void> (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2868, __PRETTY_FUNCTION__));
    APFloat LHSFloat = LHSElt.getFloat();

    if (!handleFloatFloatBinOp(Info, E, LHSFloat, Opcode,
                               RHSElt.getFloat())) {
      Info.FFDiag(E);
      return false;
    }

    ResultElements.emplace_back(LHSFloat);
  }
}

LHSValue = APValue(ResultElements.data(), ResultElements.size());
return true;
2883}

2885/// Cast an lvalue referring to a base subobject to a derived class, by
2886/// truncating the lvalue's path to the given length.
2887static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2896, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2896, __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;
2914}

2916static 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;
2928}

2930static 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;
2953}

2955static 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;
2966}

2968/// Cast an lvalue referring to a derived class to a known base subobject.
2969static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 2975);

for (CXXBasePathElement &Elem : Paths.front())
  if (!HandleLValueBase(Info, E, Result, Elem.Class, Elem.Base))
    return false;
return true;
2981}

2983/// Update LVal to refer to the given field, which must be a member of the type
2984/// currently described by LVal.
2985static 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;
2997}

2999/// Update LVal to refer to the given indirect field.
3000static 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;
3007}

3009/// Get the size of the given type in char units.
3010static 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;
3033}

3035/// Update a pointer value to model pointer arithmetic.
3036/// \param Info - Information about the ongoing evaluation.
3037/// \param E - The expression being evaluated, for diagnostic purposes.
3038/// \param LVal - The pointer value to be updated.
3039/// \param EltTy - The pointee type represented by LVal.
3040/// \param Adjustment - The adjustment, in objects of type EltTy, to add.
3041static 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;
3050}

3052static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E,
                                      LValue &LVal, QualType EltTy,
                                      int64_t Adjustment) {
return HandleLValueArrayAdjustment(Info, E, LVal, EltTy,
                                   APSInt::get(Adjustment));
3057}

3059/// Update an lvalue to refer to a component of a complex number.
3060/// \param Info - Information about the ongoing evaluation.
3061/// \param LVal - The lvalue to be updated.
3062/// \param EltTy - The complex number's component type.
3063/// \param Imag - False for the real component, true for the imaginary.
3064static 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;
3075}

3077/// Try to evaluate the initializer for a variable declaration.
3078///
3079/// \param Info   Information about the ongoing evaluation.
3080/// \param E      An expression to be used when printing diagnostics.
3081/// \param VD     The variable whose initializer should be obtained.
3082/// \param Frame  The frame in which the variable was created. Must be null
3083///               if this variable is not local to the evaluation.
3084/// \param Result Filled in with a pointer to the value of the variable.
3085static 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_constexpr_function_param_value_unknown) << VD;
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3115, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3115, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3115, __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.
// FIXME: We should eventually check whether the variable has a reachable
// initializing declaration.
const Expr *Init = VD->getAnyInitializer(VD);
if (!Init) {
  // Don't diagnose during potential constant expression checking; an
  // initializer might be added later.
  if (!Info.checkingPotentialConstantExpression()) {
    Info.FFDiag(E, diag::note_constexpr_var_init_unknown, 1)
      << VD;
    Info.Note(VD->getLocation(), diag::note_declared_at);
  }
  return false;
}

if (Init->isValueDependent()) {
  // The DeclRefExpr is not value-dependent, but the variable it refers to
  // has a value-dependent initializer. This should only happen in
  // constant-folding cases, where the variable is not actually of a suitable
  // type for use in a constant expression (otherwise the DeclRefExpr would
  // have been value-dependent too), so diagnose that.
  assert(!VD->mightBeUsableInConstantExpressions(Info.Ctx))((!VD->mightBeUsableInConstantExpressions(Info.Ctx)) ? static_cast
<void> (0) : __assert_fail ("!VD->mightBeUsableInConstantExpressions(Info.Ctx)"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3148, __PRETTY_FUNCTION__));
  if (!Info.checkingPotentialConstantExpression()) {
    Info.FFDiag(E, Info.getLangOpts().CPlusPlus11
                       ? diag::note_constexpr_ltor_non_constexpr
                       : diag::note_constexpr_ltor_non_integral, 1)
        << VD << VD->getType();
    Info.Note(VD->getLocation(), diag::note_declared_at);
  }
  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;
}

// 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;
}

// Check that the variable is actually usable in constant expressions.
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);
}

// Never use the initializer of a weak variable, not even for constant
// folding. We can't be sure that this is the definition that will be used.
if (VD->isWeak()) {
  Info.FFDiag(E, diag::note_constexpr_var_init_weak) << VD;
  Info.Note(VD->getLocation(), diag::note_declared_at);
  return false;
}

Result = VD->getEvaluatedValue();
return true;
3195}

3197static bool IsConstNonVolatile(QualType T) {
Qualifiers Quals = T.getQualifiers();
return Quals.hasConst() && !Quals.hasVolatile();
3200}

3202/// Get the base index of the given base class within an APValue representing
3203/// the given derived class.
3204static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3214);
3215}

3217/// Extract the value of a character from a string literal.
3218static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3221, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3221, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3227, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3236, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3238, __PRETTY_FUNCTION__));

APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(),
             CharType->isUnsignedIntegerType());
if (Index < S->getLength())
  Value = S->getCodeUnit(Index);
return Value;
3245}

3247// Expand a string literal into an array of characters.
3248//
3249// FIXME: This is inefficient; we should probably introduce something similar
3250// to the LLVM ConstantDataArray to make this cheaper.
3251static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3256, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3258, __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);
}
3271}

3273// Expand an array so that it has more than Index filled elements.
3274static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3276, __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);
3292}

3294/// Determine whether a type would actually be read by an lvalue-to-rvalue
3295/// conversion. If it's of class type, we may assume that the copy operation
3296/// is trivial. Note that this is never true for a union type with fields
3297/// (because the copy always "reads" the active member) and always true for
3298/// a non-class type.
3299static bool isReadByLvalueToRvalueConversion(const CXXRecordDecl *RD);
3300static bool isReadByLvalueToRvalueConversion(QualType T) {
CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
return !RD || isReadByLvalueToRvalueConversion(RD);
3303}
3304static bool isReadByLvalueToRvalueConversion(const CXXRecordDecl *RD) {
// FIXME: A trivial copy of a union copies the object representation, even if
// the union is empty.
if (RD->isUnion())
  return !RD->field_empty();
if (RD->isEmpty())
  return false;

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

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

return false;
3322}

3324/// Diagnose an attempt to read from any unreadable field within the specified
3325/// type, which might be a class type.
3326static 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;
3357}

3359static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3405);
3406}

3408namespace {
3409/// A handle to a complete object (an object that is not a subobject of
3410/// another object).
3411struct 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 {
  // If this isn't a "real" access (eg, if it's just accessing the type
  // info), allow it. We assume the type doesn't change dynamically for
  // subobjects of constexpr objects (even though we'd hit UB here if it
  // did). FIXME: Is this right?
  if (!isAnyAccess(AK))
    return true;

  // 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(); }
3440};
3441} // end anonymous namespace

3443static 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;
3455}

3457/// Find the designated sub-object of an rvalue.
3458template<typename SubobjectHandler>
3459typename SubobjectHandler::result_type
3460findSubobject(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() && !(handler.AccessKind == AK_Construct && I == N)) ||
      (O->isIndeterminate() &&
       !isValidIndeterminateAccess(handler.AccessKind))) {
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3564, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3601, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3606, __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()) {
        if (I == N - 1 && handler.AccessKind == AK_Construct) {
          // Placement new onto an inactive union member makes it active.
          O->setUnion(Field, APValue());
        } else {
          // 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));
  }
}
3655}

3657namespace {
3658struct 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;
}
3680};
3681} // end anonymous namespace

3683/// Extract the designated sub-object of an rvalue.
3684static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3688, __PRETTY_FUNCTION__));
ExtractSubobjectHandler Handler = {Info, E, Result, AK};
return findSubobject(Info, E, Obj, Sub, Handler);
3691}

3693namespace {
3694struct 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;
}
3736};
3737} // end anonymous namespace

3739const AccessKinds ModifySubobjectHandler::AccessKind;

3741/// Update the designated sub-object of an rvalue to the given value.
3742static 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);
3748}

3750/// Find the position where two subobject designators diverge, or equivalently
3751/// the length of the common initial subsequence.
3752static 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;
3785}

3787/// Determine whether the given subobject designators refer to elements of the
3788/// same array object.
3789static 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;
3806}

3808/// Find the complete object to which an LValue refers.
3809static 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 ConstantExpr *CE =
        dyn_cast_or_null<ConstantExpr>(LVal.Base.dyn_cast<const Expr *>())) {
  /// Nested immediate invocation have been previously removed so if we found
  /// a ConstantExpr it can only be the EvaluatingDecl.
  assert(CE->isImmediateInvocation() && CE == Info.EvaluatingDecl)((CE->isImmediateInvocation() && CE == Info.EvaluatingDecl
) ? static_cast<void> (0) : __assert_fail ("CE->isImmediateInvocation() && CE == Info.EvaluatingDecl"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3858, __PRETTY_FUNCTION__));
  (void)CE;
  BaseVal = Info.EvaluatingDeclValue;
} else if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl *>()) {
  // Allow reading from a GUID declaration.
  if (auto *GD = dyn_cast<MSGuidDecl>(D)) {
    if (isModification(AK)) {
      // All the remaining cases do not permit modification of the object.
      Info.FFDiag(E, diag::note_constexpr_modify_global);
      return CompleteObject();
    }
    APValue &V = GD->getAsAPValue();
    if (V.isAbsent()) {
      Info.FFDiag(E, diag::note_constexpr_unsupported_layout)
          << GD->getType();
      return CompleteObject();
    }
    return CompleteObject(LVal.Base, &V, GD->getType());
  }

  // 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();
  }

  // In OpenCL if a variable is in constant address space it is a const value.
  bool IsConstant = BaseType.isConstQualified() ||
                    (Info.getLangOpts().OpenCL &&
                     BaseType.getAddressSpace() == LangAS::opencl_constant);

  // 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 (!IsConstant) {
        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 (IsConstant && Info.checkingPotentialConstantExpression() &&
               BaseType->isLiteralType(Info.Ctx) && !VD->hasDefinition()) {
      // This variable might end up being constexpr. Don't diagnose it yet.
    } else if (IsConstant) {
      // Keep evaluating to see what we can do. In particular, 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().CPlusPlus) {
        Info.CCEDiag(E, Info.getLangOpts().CPlusPlus11
                            ? diag::note_constexpr_ltor_non_constexpr
                            : diag::note_constexpr_ltor_non_integral, 1)
            << VD << BaseType;
        Info.Note(VD->getLocation(), diag::note_declared_at);
      } else {
        Info.CCEDiag(E);
      }
    } else {
      // Never allow reading a non-const value.
      if (Info.getLangOpts().CPlusPlus) {
        Info.FFDiag(E, Info.getLangOpts().CPlusPlus11
                           ? diag::note_constexpr_ltor_non_constexpr
                           : diag::note_constexpr_ltor_non_integral, 1)
            << VD << BaseType;
        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<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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3978, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 3978, __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 = MTE->getOrCreateValue(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4010, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4025, __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);
4040}

4042/// Perform an lvalue-to-rvalue conversion on the given glvalue. This
4043/// can also be used for 'lvalue-to-lvalue' conversions for looking up the
4044/// glvalue referred to by an entity of reference type.
4045///
4046/// \param Info - Information about the ongoing evaluation.
4047/// \param Conv - The expression for which we are performing the conversion.
4048///               Used for diagnostics.
4049/// \param Type - The type of the glvalue (before stripping cv-qualifiers in the
4050///               case of a non-class type).
4051/// \param LVal - The glvalue on which we are attempting to perform this action.
4052/// \param RVal - The produced value will be placed here.
4053/// \param WantObjectRepresentation - If true, we're looking for the object
4054///               representation rather than the value, and in particular,
4055///               there is no requirement that the result be fully initialized.
4056static bool
4057handleLValueToRValueConversion(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4087, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4087, __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);
4110}

4112/// Perform an assignment of Val to LVal. Takes ownership of Val.
4113static 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);
4125}

4127namespace {
4128struct CompoundAssignSubobjectHandler {
EvalInfo &Info;
const CompoundAssignOperator *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);
  case APValue::Vector:
    return foundVector(Subobj, SubobjType);
  default:
    // FIXME: can this happen?
    Info.FFDiag(E);
    return false;
  }
}

bool foundVector(APValue &Value, QualType SubobjType) {
  if (!checkConst(SubobjType))
    return false;

  if (!SubobjType->isVectorType()) {
    Info.FFDiag(E);
    return false;
  }
  return handleVectorVectorBinOp(Info, E, Opcode, Value, RHS);
}

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;
}
4244};
4245} // end anonymous namespace

4247const AccessKinds CompoundAssignSubobjectHandler::AccessKind;

4249/// Perform a compound assignment of LVal <op>= RVal.
4250static bool handleCompoundAssignment(EvalInfo &Info,
                                   const CompoundAssignOperator *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);
4268}

4270namespace {
4271struct 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;
}
4394};
4395} // end anonymous namespace

4397/// Perform an increment or decrement on LVal.
4398static 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);
4412}

4414/// Build an lvalue for the object argument of a member function call.
4415static 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;
4428}

4430/// HandleMemberPointerAccess - Evaluate a member access operation and build an
4431/// lvalue referring to the result.
4432///
4433/// \param Info - Information about the ongoing evaluation.
4434/// \param LV - An lvalue referring to the base of the member pointer.
4435/// \param RHS - The member pointer expression.
4436/// \param IncludeMember - Specifies whether the member itself is included in
4437///        the resulting LValue subobject designator. This is not possible when
4438///        creating a bound member function.
4439/// \return The field or method declaration to which the member pointer refers,
4440///         or 0 if evaluation fails.
4441static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4492, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4516);
  }
}

return MemPtr.getDecl();
4521}

4523static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4527, __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);
4539}

4541/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on
4542/// the provided lvalue, which currently refers to the base object.
4543static 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);
4577}

4579/// Get the value to use for a default-initialized object of type T.
4580/// Return false if it encounters something invalid.
4581static bool getDefaultInitValue(QualType T, APValue &Result) {
bool Success = true;
if (auto *RD = T->getAsCXXRecordDecl()) {
  if (RD->isInvalidDecl()) {
    Result = APValue();
    return false;
  }
  if (RD->isUnion()) {
    Result = APValue((const FieldDecl *)nullptr);
    return true;
  }
  Result = APValue(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)
    Success &= getDefaultInitValue(I->getType(), Result.getStructBase(Index));

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

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

  return Success;
}

Result = APValue::IndeterminateValue();
return true;
4622}

4624namespace {
4625enum 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
4638};
4639}

4641static 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)
  return getDefaultInitValue(VD->getType(), Val);

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;
4665}

4667static 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;
4679}


4682/// Evaluate a condition (either a variable declaration or an expression).
4683static 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();
4691}

4693namespace {
4694/// A location where the result (returned value) of evaluating a
4695/// statement should be stored.
4696struct 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;
4701};

4703struct TempVersionRAII {
CallStackFrame &Frame;

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

~TempVersionRAII() {
  Frame.popTempVersion();
}
4713};

4715}

4717static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info,
                                 const Stmt *S,
                                 const SwitchCase *SC = nullptr);

4721/// Evaluate the body of a loop, and translate the result as appropriate.
4722static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4742);
4743}

4745/// Evaluate a switch statement.
4746static 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_Succeeded : ESR_Failed;

// 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4815);
4816}

4818// Evaluate a statement.
4819static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4857, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 4900, __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);
}
5208}

5210/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial
5211/// default constructor. If so, we'll fold it whether or not it's marked as
5212/// constexpr. If it is marked as constexpr, we will never implicitly define it,
5213/// so we need special handling.
5214static 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;
5235}

5237/// CheckConstexprFunction - Check that a function can be called in a constant
5238/// expression.
5239static 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().CPlusPlus20 && 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;
}

if (const auto *CtorDecl = dyn_cast_or_null<CXXConstructorDecl>(Definition)) {
  for (const auto *InitExpr : CtorDecl->inits()) {
    if (InitExpr->getInit() && InitExpr->getInit()->containsErrors())
      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;
5306}

5308namespace {
5309struct 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; }
5316};
5317} // end anonymous namespace

5319/// Check that we can access the notional vptr of an object / determine its
5320/// dynamic type.
5321static 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);
5358}

5360/// Check that the pointee of the 'this' pointer in a member function call is
5361/// either within its lifetime or in its period of construction or destruction.
5362static bool
5363checkNonVirtualMemberCallThisPointer(EvalInfo &Info, const Expr *E,
                                   const LValue &This,
                                   const CXXMethodDecl *NamedMember) {
return checkDynamicType(
    Info, E, This,
    isa<CXXDestructorDecl>(NamedMember) ? AK_Destroy : AK_MemberCall, false);
5369}

5371struct DynamicType {
/// The dynamic class type of the object.
const CXXRecordDecl *Type;
/// The corresponding path length in the lvalue.
unsigned PathLength;
5376};

5378static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5381, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5381, __PRETTY_FUNCTION__));
return (PathLength == Designator.MostDerivedPathLength)
           ? Designator.MostDerivedType->getAsCXXRecordDecl()
           : getAsBaseClass(Designator.Entries[PathLength - 1]);
5385}

5387/// Determine the dynamic type of an object.
5388static 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::AfterFields:
  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;
5440}

5442/// Perform virtual dispatch.
5443static 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;
5503}

5505/// Perform the adjustment from a value returned by a virtual function to
5506/// a value of the statically expected type, which may be a pointer or
5507/// reference to a base class of the returned type.
5508static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5512, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5512, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5522, __PRETTY_FUNCTION__));
  if (OldClass != NewClass &&
      !CastToBaseClass(Info, E, LVal, OldClass, NewClass))
    return false;
  OldClass = NewClass;
}

LVal.moveInto(Result);
return true;
5531}

5533/// Determine whether \p Base, which is known to be a direct base class of
5534/// \p Derived, is a public base class.
5535static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5542);
5543}

5545/// Apply the given dynamic cast operation on the provided lvalue.
5546///
5547/// This implements the hard case of dynamic_cast, requiring a "runtime check"
5548/// to find a suitable target subobject.
5549static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5576, __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.
    Ptr.setNull(Info.Ctx, E->getType());
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5598, __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);
5641}

5643namespace {
5644struct StartLifetimeOfUnionMemberHandler {
EvalInfo &Info;
const Expr *LHSExpr;
const FieldDecl *Field;
bool DuringInit;
bool Failed = false;
static const AccessKinds AccessKind = AK_Assign;

typedef bool result_type;
bool failed() { return Failed; }
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5663, __PRETTY_FUNCTION__));
  if (declaresSameEntity(Subobj.getUnionField(), Field)) {
    // This union member is already active. If it's also in-lifetime, there's
    // nothing to do.
    if (Subobj.getUnionValue().hasValue())
      return true;
  } else if (DuringInit) {
    // We're currently in the process of initializing a different union
    // member.  If we carried on, that initialization would attempt to
    // store to an inactive union member, resulting in undefined behavior.
    Info.FFDiag(LHSExpr,
                diag::note_constexpr_union_member_change_during_init);
    return false;
  }
  APValue Result;
  Failed = !getDefaultInitValue(Field->getType(), Result);
  Subobj.setUnion(Field, Result);
  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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5683);
}
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5686);
}
5688};
5689} // end anonymous namespace

5691const AccessKinds StartLifetimeOfUnionMemberHandler::AccessKind;

5693/// Handle a builtin simple-assignment or a call to a trivial assignment
5694/// operator whose left-hand side might involve a union member access. If it
5695/// does, implicitly start the lifetime of any accessed union elements per
5696/// C++20 [class.union]5.
5697static 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()) {
      //    ... of a non-class, non-array type, or of a class type with a
      //    trivial default constructor that is not deleted, or an array of
      //    such types.
      auto *RD =
          FD->getType()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
      if (!RD || RD->hasTrivialDefaultConstructor())
        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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5730, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5730, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5730, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5757, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5757, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5757, __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);

  bool DuringInit = Info.isEvaluatingCtorDtor(LHS.Base, D.Entries) ==
                    ConstructionPhase::AfterBases;
  StartLifetimeOfUnionMemberHandler StartLifetime{
      Info, LHSExpr, LengthAndField.second, DuringInit};
  if (!findSubobject(Info, LHSExpr, Obj, D, StartLifetime))
    return false;
}

return true;
5791}

5793namespace {
5794typedef SmallVector<APValue, 8> ArgVector;
5795}

5797/// EvaluateArgs - Evaluate the arguments to a function call.
5798static 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;
      }
  }
}
// FIXME: This is the wrong evaluation order for an assignment operator
// called via operator syntax.
for (unsigned Idx = 0; Idx < Args.size(); Idx++) {
  if (!Evaluate(ArgValues[Idx], Info, Args[Idx])) {
    // 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[Idx] &&
             ArgValues[Idx].isLValue() &&
             ArgValues[Idx].isNullPointer()) {
    Info.CCEDiag(Args[Idx], diag::note_non_null_attribute_failed);
    if (!Info.noteFailure())
      return false;
    Success = false;
  }
}
return Success;
5837}

5839/// Evaluate a function call.
5840static 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() &&
      isReadByLvalueToRvalueConversion(MD->getParent())))) {
  assert(This &&((This && (MD->isCopyAssignmentOperator() || MD->
isMoveAssignmentOperator())) ? static_cast<void> (0) : __assert_fail
 ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5866, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5866, __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().CPlusPlus20 && 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;
5901}

5903/// Evaluate a constructor call.
5904static 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() &&
      isReadByLvalueToRvalueConversion(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 (!Result.hasValue()) {
  if (!RD->isUnion())
    Result = APValue(APValue::UninitStruct(), RD->getNumBases(),
                     std::distance(RD->field_begin(), RD->field_end()));
  else
    // A union starts with no active member.
    Result = APValue((const FieldDecl*)nullptr);
}

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;
5978#ifndef NDEBUG
CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin();
5980#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5987, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 5993, __PRETTY_FUNCTION__));
    if (!FieldIt->isUnnamedBitfield())
      Success &= getDefaultInitValue(
          FieldIt->getType(),
          Result.getStructField(FieldIt->getFieldIndex()));
  }
  ++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);
6010#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6013, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6015, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6015, __PRETTY_FUNCTION__));
    ++BaseIt;
6017#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.
          Success &= getDefaultInitValue(Info.Ctx.getRecordType(CD), *Value);
      }
      // 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6069);
  }

  // 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())
      Success &= getDefaultInitValue(
          FieldIt->getType(),
          Result.getStructField(FieldIt->getFieldIndex()));
  }
}

EvalObj.finishedConstructingFields();

return Success &&
       EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed &&
       LifetimeExtendedScope.destroy();
6110}

6112static 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);
6122}

6124static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6283, __PRETTY_FUNCTION__));

// The period of destruction ends now. The object is gone.
Value = APValue();
return true;
6288}

6290namespace {
6291struct 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;
}
6311};
6312}

6314/// Perform a destructor or pseudo-destructor call on the given object, which
6315/// might in general not be a complete object.
6316static 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);
6321}

6323/// Destroy and end the lifetime of the given complete object.
6324static 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);
6335}

6337/// Perform a call to 'perator new' or to `__builtin_operator_new'.
6338static bool HandleOperatorNewCall(EvalInfo &Info, const CallExpr *E,
                                LValue &Result) {
if (Info.checkingPotentialConstantExpression() ||
    Info.SpeculativeEvaluationDepth)
  return false;

// This is permitted only within a call to std::allocator<T>::allocate.
auto Caller = Info.getStdAllocatorCaller("allocate");
if (!Caller) {
  Info.FFDiag(E->getExprLoc(), Info.getLangOpts().CPlusPlus20
                                   ? diag::note_constexpr_new_untyped
                                   : diag::note_constexpr_new);
  return false;
}

QualType ElemType = Caller.ElemType;
if (ElemType->isIncompleteType() || ElemType->isFunctionType()) {
  Info.FFDiag(E->getExprLoc(),
              diag::note_constexpr_new_not_complete_object_type)
      << (ElemType->isIncompleteType() ? 0 : 1) << ElemType;
  return false;
}

APSInt ByteSize;
if (!EvaluateInteger(E->getArg(0), ByteSize, Info))
  return false;
bool IsNothrow = false;
for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I) {
  EvaluateIgnoredValue(Info, E->getArg(I));
  IsNothrow |= E->getType()->isNothrowT();
}

CharUnits ElemSize;
if (!HandleSizeof(Info, E->getExprLoc(), ElemType, ElemSize))
  return false;
APInt Size, Remainder;
APInt ElemSizeAP(ByteSize.getBitWidth(), ElemSize.getQuantity());
APInt::udivrem(ByteSize, ElemSizeAP, Size, Remainder);
if (Remainder != 0) {
  // This likely indicates a bug in the implementation of 'std::allocator'.
  Info.FFDiag(E->getExprLoc(), diag::note_constexpr_operator_new_bad_size)
      << ByteSize << APSInt(ElemSizeAP, true) << ElemType;
  return false;
}

if (ByteSize.getActiveBits() > ConstantArrayType::getMaxSizeBits(Info.Ctx)) {
  if (IsNothrow) {
    Result.setNull(Info.Ctx, E->getType());
    return true;
  }

  Info.FFDiag(E, diag::note_constexpr_new_too_large) << APSInt(Size, true);
  return false;
}

QualType AllocType = Info.Ctx.getConstantArrayType(ElemType, Size, nullptr,
                                                   ArrayType::Normal, 0);
APValue *Val = Info.createHeapAlloc(E, AllocType, Result);
*Val = APValue(APValue::UninitArray(), 0, Size.getZExtValue());
Result.addArray(Info, E, cast<ConstantArrayType>(AllocType));
return true;
6399}

6401static bool hasVirtualDestructor(QualType T) {
if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
  if (CXXDestructorDecl *DD = RD->getDestructor())
    return DD->isVirtual();
return false;
6406}

6408static const FunctionDecl *getVirtualOperatorDelete(QualType T) {
if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
  if (CXXDestructorDecl *DD = RD->getDestructor())
    return DD->isVirtual() ? DD->getOperatorDelete() : nullptr;
return nullptr;
6413}

6415/// Check that the given object is a suitable pointer to a heap allocation that
6416/// still exists and is of the right kind for the purpose of a deletion.
6417///
6418/// On success, returns the heap allocation to deallocate. On failure, produces
6419/// a diagnostic and returns None.
6420static Optional<DynAlloc *> CheckDeleteKind(EvalInfo &Info, const Expr *E,
                                          const LValue &Pointer,
                                          DynAlloc::Kind DeallocKind) {
auto PointerAsString = [&] {
  return Pointer.toString(Info.Ctx, Info.Ctx.VoidPtrTy);
};

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 None;
}

Optional<DynAlloc *> Alloc = Info.lookupDynamicAlloc(DA);
if (!Alloc) {
  Info.FFDiag(E, diag::note_constexpr_double_delete);
  return None;
}

QualType AllocType = Pointer.Base.getDynamicAllocType();
if (DeallocKind != (*Alloc)->getKind()) {
  Info.FFDiag(E, diag::note_constexpr_new_delete_mismatch)
      << DeallocKind << (*Alloc)->getKind() << AllocType;
  NoteLValueLocation(Info, Pointer.Base);
  return None;
}

bool Subobject = false;
if (DeallocKind == DynAlloc::New) {
  Subobject = Pointer.Designator.MostDerivedPathLength != 0 ||
              Pointer.Designator.isOnePastTheEnd();
} else {
  Subobject = Pointer.Designator.Entries.size() != 1 ||
              Pointer.Designator.Entries[0].getAsArrayIndex() != 0;
}
if (Subobject) {
  Info.FFDiag(E, diag::note_constexpr_delete_subobject)
      << PointerAsString() << Pointer.Designator.isOnePastTheEnd();
  return None;
}

return Alloc;
6465}

6467// Perform a call to 'operator delete' or '__builtin_operator_delete'.
6468bool HandleOperatorDeleteCall(EvalInfo &Info, const CallExpr *E) {
if (Info.checkingPotentialConstantExpression() ||
    Info.SpeculativeEvaluationDepth)
  return false;

// This is permitted only within a call to std::allocator<T>::deallocate.
if (!Info.getStdAllocatorCaller("deallocate")) {
  Info.FFDiag(E->getExprLoc());
  return true;
}

LValue Pointer;
if (!EvaluatePointer(E->getArg(0), Pointer, Info))
  return false;
for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I)
  EvaluateIgnoredValue(Info, E->getArg(I));

if (Pointer.Designator.Invalid)
  return false;

// Deleting a null pointer has no effect.
if (Pointer.isNullPointer())
  return true;

if (!CheckDeleteKind(Info, E, Pointer, DynAlloc::StdAllocator))
  return false;

Info.HeapAllocs.erase(Pointer.Base.get<DynamicAllocLValue>());
return true;
6497}

6499//===----------------------------------------------------------------------===//
6500// Generic Evaluation
6501//===----------------------------------------------------------------------===//
6502namespace {

6504class 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;

6517public:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6543, __PRETTY_FUNCTION__));
    Bytes[Offset.getQuantity() + Index] = Byte;
    ++Index;
  }
}

size_t size() { return Bytes.size(); }
6550};

6552/// Traverse an APValue to produce an BitCastBuffer, emulating how the current
6553/// target would represent the value at runtime.
6554class 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6571, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6608);
  }
  llvm_unreachable("Unhandled APValue::ValueKind")::llvm::llvm_unreachable_internal("Unhandled APValue::ValueKind"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6610);
}

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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6641, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6641, __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) {
  APSInt AdjustedVal = Val;
  unsigned Width = AdjustedVal.getBitWidth();
  if (Ty->isBooleanType()) {
    Width = Info.Ctx.getTypeSize(Ty);
    AdjustedVal = AdjustedVal.extend(Width);
  }

  SmallVector<unsigned char, 8> Bytes(Width / 8);
  llvm::StoreIntToMemory(AdjustedVal, &*Bytes.begin(), Width / 8);
  Buffer.writeObject(Offset, Bytes);
  return true;
}

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

6700public:
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;
}
6709};

6711/// Write an BitCastBuffer into an APValue.
6712class 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;
}

llvm::NoneType unrepresentableValue(QualType Ty, const APSInt &Val) {
  Info.FFDiag(BCE->getBeginLoc(),
              diag::note_constexpr_bit_cast_unrepresentable_value)
      << Ty << Val.toString(/*Radix=*/10);
  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);

  // Work around floating point types that contain unused padding bytes. This
  // is really just `long double` on x86, which is the only fundamental type
  // with padding bytes.
  if (T->isRealFloatingType()) {
    const llvm::fltSemantics &Semantics =
        Info.Ctx.getFloatTypeSemantics(QualType(T, 0));
    unsigned NumBits = llvm::APFloatBase::getSizeInBits(Semantics);
    assert(NumBits % 8 == 0)((NumBits % 8 == 0) ? static_cast<void> (0) : __assert_fail
 ("NumBits % 8 == 0", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6756, __PRETTY_FUNCTION__));
    CharUnits NumBytes = CharUnits::fromQuantity(NumBits / 8);
    if (NumBytes != SizeOf)
      SizeOf = NumBytes;
  }

  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());

    unsigned IntWidth = Info.Ctx.getIntWidth(QualType(T, 0));
    if (IntWidth != Val.getBitWidth()) {
      APSInt Truncated = Val.trunc(IntWidth);
      if (Truncated.extend(Val.getBitWidth()) != Val)
        return unrepresentableValue(QualType(T, 0), Val);
      Val = Truncated;
    }

    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6847, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6866, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6866, __PRETTY_FUNCTION__));
  const auto *AsBuiltin =
      RepresentationType.getCanonicalType()->castAs<BuiltinType>();
  // 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()) {
6898#define TYPE(Class, Base)                                                      \
case Type::Class:                                                            \
  return visit(cast<Class##Type>(Can.getTypePtr()), Offset);
6901#define ABSTRACT_TYPE(Class, Base)
6902#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6904);
6905#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6908)
      "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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6908);
6909#define NON_CANONICAL_UNLESS_DEPENDENT(Class, Base)case Type::Class: ::llvm::llvm_unreachable_internal("either dependent or not canonical!"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6909);                            \
case Type::Class:                                                            \
  llvm_unreachable("either dependent or not canonical!")::llvm::llvm_unreachable_internal("either dependent or not canonical!"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6911);
6912#include "clang/AST/TypeNodes.inc"
  }
  llvm_unreachable("Unhandled Type::TypeClass")::llvm::llvm_unreachable_internal("Unhandled Type::TypeClass"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6914);
}

6917public:
// 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));
}
6924};

6926static 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;
6976}

6978static 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;
6987}

6989static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6993, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6993, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6995, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 6995, __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;
7022}

7024template <class Derived>
7025class ExprEvaluatorBase
: public ConstStmtVisitor<Derived, bool> {
7027private:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7041, __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);
}

7083protected:
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); }

7094public:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7110);
}
bool VisitExpr(const Expr *E) {
  return Error(E);
}

bool VisitConstantExpr(const ConstantExpr *E) {
  if (E->hasAPValueResult())
    return DerivedSuccess(E->getAPValueResult(), 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().CPlusPlus20)
    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 VisitCXXRewrittenBinaryOperator(const CXXRewrittenBinaryOperator *E) {
  return StmtVisitorTy::Visit(E->getSemanticForm());
}

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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7248, __PRETTY_FUNCTION__));
    return Error(E);
  }
  return StmtVisitorTy::Visit(Source);
}

bool VisitPseudoObjectExpr(const PseudoObjectExpr *E) {
  for (const Expr *SemE : E->semantics()) {
    if (auto *OVE = dyn_cast<OpaqueValueExpr>(SemE)) {
      // FIXME: We can't handle the case where an OpaqueValueExpr is also the
      // result expression: there could be two different LValues that would
      // refer to the same object in that case, and we can't model that.
      if (SemE == E->getResultExpr())
        return Error(E);

      // Unique OVEs get evaluated if and when we encounter them when
      // emitting the rest of the semantic form, rather than eagerly.
      if (OVE->isUnique())
        continue;

      LValue LV;
      if (!Evaluate(Info.CurrentCall->createTemporary(
                        OVE, getStorageType(Info.Ctx, OVE), false, LV),
                    Info, OVE->getSourceExpr()))
        return false;
    } else if (SemE == E->getResultExpr()) {
      if (!StmtVisitorTy::Visit(SemE))
        return false;
    } else {
      if (!EvaluateIgnoredValue(Info, SemE))
        return false;
    }
  }
  return true;
}

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 '->*').
      const ValueDecl *D =
          HandleMemberPointerAccess(Info, BE, ThisVal, false);
      if (!D)
        return false;
      Member = dyn_cast<CXXMethodDecl>(D);
      if (!Member)
        return Error(Callee);
      This = &ThisVal;
    } else if (const auto *PDE = dyn_cast<CXXPseudoDestructorExpr>(Callee)) {
      if (!Info.getLangOpts().CPlusPlus20)
        Info.CCEDiag(PDE, diag::note_constexpr_pseudo_destructor);
      return EvaluateObjectArgument(Info, PDE->getBase(), ThisVal) &&
             HandleDestruction(Info, PDE, ThisVal, PDE->getDestroyedType());
    } 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7371, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7371, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7371, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7383, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7383, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7383, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7392, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7392, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7392, __PRETTY_FUNCTION__));
        FD = cast<CXXMethodDecl>(CorrespondingCallOpSpecialization);
      } else
        FD = LambdaCallOp;
    } else if (FD->isReplaceableGlobalAllocationFunction()) {
      if (FD->getDeclName().getCXXOverloadedOperator() == OO_New ||
          FD->getDeclName().getCXXOverloadedOperator() == OO_Array_New) {
        LValue Ptr;
        if (!HandleOperatorNewCall(Info, E, Ptr))
          return false;
        Ptr.moveInto(Result);
        return true;
      } else {
        return HandleOperatorDeleteCall(Info, E);
      }
    }
  } 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7431, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7475, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7475, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7476, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7486, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7488, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7488, __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 VisitExtVectorElementExpr(const ExtVectorElementExpr *E) {
  APValue Val;
  if (!Evaluate(Val, Info, E->getBase()))
    return false;

  if (Val.isVector()) {
    SmallVector<uint32_t, 4> Indices;
    E->getEncodedElementAccess(Indices);
    if (Indices.size() == 1) {
      // Return scalar.
      return DerivedSuccess(Val.getVectorElt(Indices[0]), E);
    } else {
      // Construct new APValue vector.
      SmallVector<APValue, 4> Elts;
      for (unsigned I = 0; I < Indices.size(); ++I) {
        Elts.push_back(Val.getVectorElt(Indices[I]));
      }
      APValue VecResult(Elts.data(), Indices.size());
      return DerivedSuccess(VecResult, E);
    }
  }

  return false;
}

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);
  }

  case CK_AddressSpaceConversion: {
    APValue Value;
    if (!Evaluate(Value, Info, E->getSubExpr()))
      return false;
    return DerivedSuccess(Value, 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7635);
}

/// 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);
}
7651};

7653} // namespace

7655//===----------------------------------------------------------------------===//
7656// Common base class for lvalue and temporary evaluation.
7657//===----------------------------------------------------------------------===//
7658namespace {
7659template<class Derived>
7660class LValueExprEvaluatorBase
: public ExprEvaluatorBase<Derived> {
7662protected:
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);
}

7677public:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7695, __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->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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7712, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7712, __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);
  }
}
7759};
7760}

7762//===----------------------------------------------------------------------===//
7763// LValue Evaluation
7764//
7765// This is used for evaluating lvalues (in C and C++), xvalues (in C++11),
7766// function designators (in C), decl references to void objects (in C), and
7767// temporaries (if building with -Wno-address-of-temporary).
7768//
7769// LValue evaluation produces values comprising a base expression of one of the
7770// following types:
7771// - Declarations
7772//  * VarDecl
7773//  * FunctionDecl
7774// - Literals
7775//  * CompoundLiteralExpr in C (and in global scope in C++)
7776//  * StringLiteral
7777//  * PredefinedExpr
7778//  * ObjCStringLiteralExpr
7779//  * ObjCEncodeExpr
7780//  * AddrLabelExpr
7781//  * BlockExpr
7782//  * CallExpr for a MakeStringConstant builtin
7783// - typeid(T) expressions, as TypeInfoLValues
7784// - Locals and temporaries
7785//  * MaterializeTemporaryExpr
7786//  * Any Expr, with a CallIndex indicating the function in which the temporary
7787//    was evaluated, for cases where the MaterializeTemporaryExpr is missing
7788//    from the AST (FIXME).
7789//  * A MaterializeTemporaryExpr that has static storage duration, with no
7790//    CallIndex, for a lifetime-extended temporary.
7791//  * The ConstantExpr that is currently being evaluated during evaluation of an
7792//    immediate invocation.
7793// plus an offset in bytes.
7794//===----------------------------------------------------------------------===//
7795namespace {
7796class LValueExprEvaluator
: public LValueExprEvaluatorBase<LValueExprEvaluator> {
7798public:
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);
  }
}
7850};
7851} // end anonymous namespace

7853/// Evaluate an expression as an lvalue. This can be legitimately called on
7854/// expressions which are not glvalues, in three cases:
7855///  * function designators in C, and
7856///  * "extern void" objects
7857///  * @selector() expressions in Objective-C
7858static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7861, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 7861, __PRETTY_FUNCTION__));
return LValueExprEvaluator(Info, Result, InvalidBaseOK).Visit(E);
7863}

7865bool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) {
if (const FunctionDecl *FD1.1
'FD' is null
1
'FD' is null
 = dyn_cast<FunctionDecl>(E->getDecl()))
1
Assuming the object is not a 'FunctionDecl'→
2
←
Taking false branch→
  return Success(FD);
if (const VarDecl *VD3.1
'VD' is non-null
1
'VD' is non-null
 = dyn_cast<VarDecl>(E->getDecl()))
3
←
Assuming the object is a 'VarDecl'→
4
←
Taking true branch→
  return VisitVarDecl(E, VD);
5
←
Calling 'LValueExprEvaluator::VisitVarDecl'→
if (const BindingDecl *BD = dyn_cast<BindingDecl>(E->getDecl()))
  return Visit(BD->getBinding());
if (const MSGuidDecl *GD = dyn_cast<MSGuidDecl>(E->getDecl()))
  return Success(GD);
return Error(E);
7875}


7878bool 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) &&
6
←
Assuming field 'CurrentCall' is null→
    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) {
7
←
Calling 'VarDecl::hasLocalStorage'→
13
←
Returning from 'VarDecl::hasLocalStorage'→
14
←
Access to field 'Index' results in a dereference of a null pointer (loaded from field 'CurrentCall')
  // 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);
7947}

7949bool 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->getSubExpr()->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 = E->getOrCreateValue(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;
8010}

8012bool
8013LValueExprEvaluator::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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8015, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8015, __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);
8019}

8021bool 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().CPlusPlus20) {
    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()));
8049}

8051bool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) {
return Success(E->getGuidDecl());
8053}

8055bool 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);
8072}

8074bool 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);
8092}

8094bool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) {
return evaluatePointer(E->getSubExpr(), Result);
8096}

8098bool 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;
8105}

8107bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8109, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8109, __PRETTY_FUNCTION__));
if (!Visit(E->getSubExpr()))
  return false;
HandleLValueComplexElement(Info, E, Result, E->getType(), true);
return true;
8114}

8116bool 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);
8126}

8128bool 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);
8149}

8151bool 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().CPlusPlus20 &&
    !HandleUnionActiveMemberChange(Info, E->getLHS(), Result))
  return false;

return handleAssignment(this->Info, E, Result, E->getLHS()->getType(),
                        NewVal);
8172}

8174//===----------------------------------------------------------------------===//
8175// Pointer Evaluation
8176//===----------------------------------------------------------------------===//

8178/// Attempts to compute the number of bytes available at the pointer
8179/// returned by a function with the alloc_size attribute. Returns true if we
8180/// were successful. Places an unsigned number into `Result`.
8181///
8182/// This expects the given CallExpr to be a call to a function with an
8183/// alloc_size attribute.
8184static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8189, __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;
8227}

8229/// Convenience function. LVal's base must be a call to an alloc_size
8230/// function.
8231static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8235, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8235, __PRETTY_FUNCTION__));
const auto *Base = LVal.getLValueBase().get<const Expr *>();
const CallExpr *CE = tryUnwrapAllocSizeCall(Base);
return getBytesReturnedByAllocSizeCall(Ctx, CE, Result);
8239}

8241/// Attempts to evaluate the given LValueBase as the result of a call to
8242/// a function with the alloc_size attribute. If it was possible to do so, this
8243/// function will return true, make Result's Base point to said function call,
8244/// and mark Result's Base as invalid.
8245static 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;
8275}

8277namespace {
8278class 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);
8297public:

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) {
  Result.setNull(Info.Ctx, E->getType());
  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)) {
    // Ensure we actually have captured 'this'. (an error will have
    // been previously reported if not).
    if (!Info.CurrentCall->LambdaThisCaptureField)
      return false;

    // 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8377, __PRETTY_FUNCTION__));
  APValue LValResult = E->EvaluateInContext(
      Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr());
  Result.setFrom(Info.Ctx, LValResult);
  return true;
}

// FIXME: Missing: @protocol, @selector
8385};
8386} // end anonymous namespace

8388static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8390, __PRETTY_FUNCTION__));
return PointerExprEvaluator(Info, Result, InvalidBaseOK).Visit(E);
8392}

8394bool 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);
8417}

8419bool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) {
return evaluateLValue(E->getSubExpr(), Result);
8421}

8423bool 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()) {
    if (!Result.InvalidBase && !Result.Designator.Invalid &&
        !Result.IsNullPtr &&
        Info.Ctx.hasSameUnqualifiedType(Result.Designator.getType(Info.Ctx),
                                        E->getType()->getPointeeType()) &&
        Info.getStdAllocatorCaller("allocate")) {
      // Inside a call to std::allocator::allocate and friends, we permit
      // casting from void* back to cv1 T* for a pointer that points to a
      // cv2 T.
    } else {
      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);
8551}

8553static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8577);
8578}

8580static 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);
8599}

8601static CharUnits getBaseAlignment(EvalInfo &Info, const LValue &Value) {
if (const auto *VD = Value.Base.dyn_cast<const ValueDecl *>())
  return Info.Ctx.getDeclAlign(VD);
if (const auto *E = Value.Base.dyn_cast<const Expr *>())
  return GetAlignOfExpr(Info, E, UETT_AlignOf);
return GetAlignOfType(Info, Value.Base.getTypeInfoType(), UETT_AlignOf);
8607}

8609/// Evaluate the value of the alignment argument to __builtin_align_{up,down},
8610/// __builtin_is_aligned and __builtin_assume_aligned.
8611static bool getAlignmentArgument(const Expr *E, QualType ForType,
                               EvalInfo &Info, APSInt &Alignment) {
if (!EvaluateInteger(E, Alignment, Info))
  return false;
if (Alignment < 0 || !Alignment.isPowerOf2()) {
  Info.FFDiag(E, diag::note_constexpr_invalid_alignment) << Alignment;
  return false;
}
unsigned SrcWidth = Info.Ctx.getIntWidth(ForType);
APSInt MaxValue(APInt::getOneBitSet(SrcWidth, SrcWidth - 1));
if (APSInt::compareValues(Alignment, MaxValue) > 0) {
  Info.FFDiag(E, diag::note_constexpr_alignment_too_big)
      << MaxValue << ForType << Alignment;
  return false;
}
// Ensure both alignment and source value have the same bit width so that we
// don't assert when computing the resulting value.
APSInt ExtAlignment =
    APSInt(Alignment.zextOrTrunc(SrcWidth), /*isUnsigned=*/true);
assert(APSInt::compareValues(Alignment, ExtAlignment) == 0 &&((APSInt::compareValues(Alignment, ExtAlignment) == 0 &&
 "Alignment should not be changed by ext/trunc") ? static_cast
<void> (0) : __assert_fail ("APSInt::compareValues(Alignment, ExtAlignment) == 0 && \"Alignment should not be changed by ext/trunc\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8631, __PRETTY_FUNCTION__))
       "Alignment should not be changed by ext/trunc")((APSInt::compareValues(Alignment, ExtAlignment) == 0 &&
 "Alignment should not be changed by ext/trunc") ? static_cast
<void> (0) : __assert_fail ("APSInt::compareValues(Alignment, ExtAlignment) == 0 && \"Alignment should not be changed by ext/trunc\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8631, __PRETTY_FUNCTION__));
Alignment = ExtAlignment;
assert(Alignment.getBitWidth() == SrcWidth)((Alignment.getBitWidth() == SrcWidth) ? static_cast<void>
 (0) : __assert_fail ("Alignment.getBitWidth() == SrcWidth", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8633, __PRETTY_FUNCTION__));
return true;
8635}

8637// To be clear: this happily visits unsupported builtins. Better name welcomed.
8638bool 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;
8649}

8651bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (IsStringLiteralCall(E))
  return Success(E);

if (unsigned BuiltinOp = E->getBuiltinCallee())
  return VisitBuiltinCallExpr(E, BuiltinOp);

return visitNonBuiltinCallExpr(E);
8659}

8661// Determine if T is a character type for which we guarantee that
8662// sizeof(T) == 1.
8663static bool isOneByteCharacterType(QualType T) {
return T->isCharType() || T->isChar8Type();
8665}

8667bool 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 (!getAlignmentArgument(E->getArg(1), E->getArg(0)->getType(), Info,
                            Alignment))
    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 = getBaseAlignment(Info, OffsetResult);

    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_align_up:
case Builtin::BI__builtin_align_down: {
  if (!evaluatePointer(E->getArg(0), Result))
    return false;
  APSInt Alignment;
  if (!getAlignmentArgument(E->getArg(1), E->getArg(0)->getType(), Info,
                            Alignment))
    return false;
  CharUnits BaseAlignment = getBaseAlignment(Info, Result);
  CharUnits PtrAlign = BaseAlignment.alignmentAtOffset(Result.Offset);
  // For align_up/align_down, we can return the same value if the alignment
  // is known to be greater or equal to the requested value.
  if (PtrAlign.getQuantity() >= Alignment)
    return true;

  // The alignment could be greater than the minimum at run-time, so we cannot
  // infer much about the resulting pointer value. One case is possible:
  // For `_Alignas(32) char buf[N]; __builtin_align_down(&buf[idx], 32)` we
  // can infer the correct index if the requested alignment is smaller than
  // the base alignment so we can perform the computation on the offset.
  if (BaseAlignment.getQuantity() >= Alignment) {
    assert(Alignment.getBitWidth() <= 64 &&((Alignment.getBitWidth() <= 64 && "Cannot handle > 64-bit address-space"
) ? static_cast<void> (0) : __assert_fail ("Alignment.getBitWidth() <= 64 && \"Cannot handle > 64-bit address-space\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8748, __PRETTY_FUNCTION__))
           "Cannot handle > 64-bit address-space")((Alignment.getBitWidth() <= 64 && "Cannot handle > 64-bit address-space"
) ? static_cast<void> (0) : __assert_fail ("Alignment.getBitWidth() <= 64 && \"Cannot handle > 64-bit address-space\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8748, __PRETTY_FUNCTION__));
    uint64_t Alignment64 = Alignment.getZExtValue();
    CharUnits NewOffset = CharUnits::fromQuantity(
        BuiltinOp == Builtin::BI__builtin_align_down
            ? llvm::alignDown(Result.Offset.getQuantity(), Alignment64)
            : llvm::alignTo(Result.Offset.getQuantity(), Alignment64));
    Result.adjustOffset(NewOffset - Result.Offset);
    // TODO: diagnose out-of-bounds values/only allow for arrays?
    return true;
  }
  // Otherwise, we cannot constant-evaluate the result.
  Info.FFDiag(E->getArg(0), diag::note_constexpr_alignment_adjust)
      << Alignment;
  return false;
}
case Builtin::BI__builtin_operator_new:
  return HandleOperatorNewCall(Info, E, Result);
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8809, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8809, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8809, __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 && !isOneByteCharacterType(CharTy)) {
    Info.FFDiag(E, diag::note_constexpr_memchr_unsupported)
        << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'")
        << CharTy;
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 8911, __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)) {
    // FIXME: Consider using our bit_cast implementation to support this.
    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:
  break;
}

return visitNonBuiltinCallExpr(E);
9025}

9027static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This,
                                   APValue &Result, const InitListExpr *ILE,
                                   QualType AllocType);
9030static bool EvaluateArrayNewConstructExpr(EvalInfo &Info, LValue &This,
                                        APValue &Result,
                                        const CXXConstructExpr *CCE,
                                        QualType AllocType);

9035bool PointerExprEvaluator::VisitCXXNewExpr(const CXXNewExpr *E) {
if (!Info.getLangOpts().CPlusPlus20)
  Info.CCEDiag(E, diag::note_constexpr_new);

// We cannot speculatively evaluate a delete expression.
if (Info.SpeculativeEvaluationDepth)
  return false;

FunctionDecl *OperatorNew = E->getOperatorNew();

bool IsNothrow = false;
bool IsPlacement = false;
if (OperatorNew->isReservedGlobalPlacementOperator() &&
    Info.CurrentCall->isStdFunction() && !E->isArray()) {
  // FIXME Support array placement new.
  assert(E->getNumPlacementArgs() == 1)((E->getNumPlacementArgs() == 1) ? static_cast<void>
 (0) : __assert_fail ("E->getNumPlacementArgs() == 1", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9050, __PRETTY_FUNCTION__));
  if (!EvaluatePointer(E->getPlacementArg(0), Result, Info))
    return false;
  if (Result.Designator.Invalid)
    return false;
  IsPlacement = true;
} else if (!OperatorNew->isReplaceableGlobalAllocationFunction()) {
  Info.FFDiag(E, diag::note_constexpr_new_non_replaceable)
      << isa<CXXMethodDecl>(OperatorNew) << OperatorNew;
  return false;
} else 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;
const CXXConstructExpr *ResizedArrayCCE = nullptr;
bool ValueInit = false;

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) {
    // No initialization is performed.
  } else if (isa<CXXScalarValueInitExpr>(Init) ||
             isa<ImplicitValueInitExpr>(Init)) {
    ValueInit = true;
  } else if (auto *CCE = dyn_cast<CXXConstructExpr>(Init)) {
    ResizedArrayCCE = CCE;
  } else {
    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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9137, __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, nullptr,
                                            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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9164, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9164, __PRETTY_FUNCTION__));
}

APValue *Val;
if (IsPlacement) {
  AccessKinds AK = AK_Construct;
  struct FindObjectHandler {
    EvalInfo &Info;
    const Expr *E;
    QualType AllocType;
    const AccessKinds AccessKind;
    APValue *Value;

    typedef bool result_type;
    bool failed() { return false; }
    bool found(APValue &Subobj, QualType SubobjType) {
      // FIXME: Reject the cases where [basic.life]p8 would not permit the
      // old name of the object to be used to name the new object.
      if (!Info.Ctx.hasSameUnqualifiedType(SubobjType, AllocType)) {
        Info.FFDiag(E, diag::note_constexpr_placement_new_wrong_type) <<
          SubobjType << AllocType;
        return false;
      }
      Value = &Subobj;
      return true;
    }
    bool found(APSInt &Value, QualType SubobjType) {
      Info.FFDiag(E, diag::note_constexpr_construct_complex_elem);
      return false;
    }
    bool found(APFloat &Value, QualType SubobjType) {
      Info.FFDiag(E, diag::note_constexpr_construct_complex_elem);
      return false;
    }
  } Handler = {Info, E, AllocType, AK, nullptr};

  CompleteObject Obj = findCompleteObject(Info, E, AK, Result, AllocType);
  if (!Obj || !findSubobject(Info, E, Obj, Result.Designator, Handler))
    return false;

  Val = Handler.Value;

  // [basic.life]p1:
  //   The lifetime of an object o of type T ends when [...] the storage
  //   which the object occupies is [...] reused by an object that is not
  //   nested within o (6.6.2).
  *Val = APValue();
} else {
  // Perform the allocation and obtain a pointer to the resulting object.
  Val = Info.createHeapAlloc(E, AllocType, Result);
  if (!Val)
    return false;
}

if (ValueInit) {
  ImplicitValueInitExpr VIE(AllocType);
  if (!EvaluateInPlace(*Val, Info, Result, &VIE))
    return false;
} else if (ResizedArrayILE) {
  if (!EvaluateArrayNewInitList(Info, Result, *Val, ResizedArrayILE,
                                AllocType))
    return false;
} else if (ResizedArrayCCE) {
  if (!EvaluateArrayNewConstructExpr(Info, Result, *Val, ResizedArrayCCE,
                                     AllocType))
    return false;
} else if (Init) {
  if (!EvaluateInPlace(*Val, Info, Result, Init))
    return false;
} else if (!getDefaultInitValue(AllocType, *Val)) {
  return false;
}

// 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;
9243}
9244//===----------------------------------------------------------------------===//
9245// Member Pointer Evaluation
9246//===----------------------------------------------------------------------===//

9248namespace {
9249class MemberPointerExprEvaluator
: public ExprEvaluatorBase<MemberPointerExprEvaluator> {
MemberPtr &Result;

bool Success(const ValueDecl *D) {
  Result = MemberPtr(D);
  return true;
}
9257public:

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);
9272};
9273} // end anonymous namespace

9275static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9277, __PRETTY_FUNCTION__));
return MemberPointerExprEvaluator(Info, Result).Visit(E);
9279}

9281bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9301, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9317, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl();
    if (!Result.castToBase(Base))
      return Error(E);
  }
  return true;
}
9324}

9326bool 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());
9330}

9332//===----------------------------------------------------------------------===//
9333// Record Evaluation
9334//===----------------------------------------------------------------------===//

9336namespace {
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);
};
9369}

9371/// Perform zero-initialization on an object of non-union class type.
9372/// C++11 [dcl.init]p5:
9373///  To zero-initialize an object or reference of type T means:
9374///    [...]
9375///    -- if T is a (possibly cv-qualified) non-union class type,
9376///       each non-static data member and each base-class subobject is
9377///       zero-initialized
9378static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9381, __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;
9419}

9421bool 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);
9447}

9449bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9470, __PRETTY_FUNCTION__));
    const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl();
    Value = &Value->getStructBase(getBaseIndex(RD, Base));
    RD = Base;
  }
  Result = *Value;
  return true;
}
}
9479}

9481bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9529, __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;
  }
}

EvalObj.finishedConstructingFields();

return Success;
9587}

9589bool 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);

  return getDefaultInitValue(T, Result);
}

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->getSubExpr());

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);
9627}

9629bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9632, __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);
9649}

9651bool 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);

auto InvalidType = [&] {
  Info.FFDiag(E, diag::note_constexpr_unsupported_layout)
    << E->getType();
  return false;
};

// 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 InvalidType();

// Start pointer.
if (!Field->getType()->isPointerType() ||
    !Info.Ctx.hasSameType(Field->getType()->getPointeeType(),
                          ArrayType->getElementType()))
  return InvalidType();

// 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 InvalidType();

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 InvalidType();

if (++Field != Record->field_end())
  return InvalidType();

return true;
9707}

9709bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9720, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9720, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9720, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9720, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9729, __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;
9747}

9749static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9752, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9752, __PRETTY_FUNCTION__));
return RecordExprEvaluator(Info, This, Result).Visit(E);
9754}

9756//===----------------------------------------------------------------------===//
9757// Temporary Evaluation
9758//
9759// Temporaries are represented in the AST as rvalues, but generally behave like
9760// lvalues. The full-object of which the temporary is a subobject is implicitly
9761// materialized so that a reference can bind to it.
9762//===----------------------------------------------------------------------===//
9763namespace {
9764class TemporaryExprEvaluator
: public LValueExprEvaluatorBase<TemporaryExprEvaluator> {
9766public:
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);
}
9801};
9802} // end anonymous namespace

9804/// Evaluate an expression of record type as a temporary.
9805static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9806, __PRETTY_FUNCTION__));
return TemporaryExprEvaluator(Info, Result).Visit(E);
9808}

9810//===----------------------------------------------------------------------===//
9811// Vector Evaluation
9812//===----------------------------------------------------------------------===//

9814namespace {
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9824, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9830, __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);
  bool VisitBinaryOperator(const BinaryOperator *E);
  // FIXME: Missing: unary -, unary ~, conditional operator (for GNU
  //                 conditional select), shufflevector, ExtVectorElementExpr
};
9845} // end anonymous namespace

9847static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9848, __PRETTY_FUNCTION__));
return VectorExprEvaluator(Info, Result).Visit(E);
9850}

9852bool 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);
}
9920}

9922bool
9923VectorExprEvaluator::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);
9969}

9971bool
9972VectorExprEvaluator::ZeroInitialization(const Expr *E) {
const auto *VT = E->getType()->castAs<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);
9984}

9986bool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
VisitIgnoredValue(E->getSubExpr());
return ZeroInitialization(E);
9989}

9991bool VectorExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
BinaryOperatorKind Op = E->getOpcode();
assert(Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp &&((Op != BO_PtrMemD && Op != BO_PtrMemI && Op !=
 BO_Cmp && "Operation not supported on vector types")
 ? static_cast<void> (0) : __assert_fail ("Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && \"Operation not supported on vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9994, __PRETTY_FUNCTION__))
       "Operation not supported on vector types")((Op != BO_PtrMemD && Op != BO_PtrMemI && Op !=
 BO_Cmp && "Operation not supported on vector types")
 ? static_cast<void> (0) : __assert_fail ("Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && \"Operation not supported on vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 9994, __PRETTY_FUNCTION__));

if (Op == BO_Comma)
  return ExprEvaluatorBaseTy::VisitBinaryOperator(E);

Expr *LHS = E->getLHS();
Expr *RHS = E->getRHS();

assert(LHS->getType()->isVectorType() && RHS->getType()->isVectorType() &&((LHS->getType()->isVectorType() && RHS->getType
()->isVectorType() && "Must both be vector types")
 ? static_cast<void> (0) : __assert_fail ("LHS->getType()->isVectorType() && RHS->getType()->isVectorType() && \"Must both be vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10003, __PRETTY_FUNCTION__))
       "Must both be vector types")((LHS->getType()->isVectorType() && RHS->getType
()->isVectorType() && "Must both be vector types")
 ? static_cast<void> (0) : __assert_fail ("LHS->getType()->isVectorType() && RHS->getType()->isVectorType() && \"Must both be vector types\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10003, __PRETTY_FUNCTION__));
// Checking JUST the types are the same would be fine, except shifts don't
// need to have their types be the same (since you always shift by an int).
assert(LHS->getType()->getAs<VectorType>()->getNumElements() ==((LHS->getType()->getAs<VectorType>()->getNumElements
() == E->getType()->getAs<VectorType>()->getNumElements
() && RHS->getType()->getAs<VectorType>()
->getNumElements() == E->getType()->getAs<VectorType
>()->getNumElements() && "All operands must be the same size."
) ? static_cast<void> (0) : __assert_fail ("LHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && RHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && \"All operands must be the same size.\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10010, __PRETTY_FUNCTION__))
           E->getType()->getAs<VectorType>()->getNumElements() &&((LHS->getType()->getAs<VectorType>()->getNumElements
() == E->getType()->getAs<VectorType>()->getNumElements
() && RHS->getType()->getAs<VectorType>()
->getNumElements() == E->getType()->getAs<VectorType
>()->getNumElements() && "All operands must be the same size."
) ? static_cast<void> (0) : __assert_fail ("LHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && RHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && \"All operands must be the same size.\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10010, __PRETTY_FUNCTION__))
       RHS->getType()->getAs<VectorType>()->getNumElements() ==((LHS->getType()->getAs<VectorType>()->getNumElements
() == E->getType()->getAs<VectorType>()->getNumElements
() && RHS->getType()->getAs<VectorType>()
->getNumElements() == E->getType()->getAs<VectorType
>()->getNumElements() && "All operands must be the same size."
) ? static_cast<void> (0) : __assert_fail ("LHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && RHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && \"All operands must be the same size.\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10010, __PRETTY_FUNCTION__))
           E->getType()->getAs<VectorType>()->getNumElements() &&((LHS->getType()->getAs<VectorType>()->getNumElements
() == E->getType()->getAs<VectorType>()->getNumElements
() && RHS->getType()->getAs<VectorType>()
->getNumElements() == E->getType()->getAs<VectorType
>()->getNumElements() && "All operands must be the same size."
) ? static_cast<void> (0) : __assert_fail ("LHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && RHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && \"All operands must be the same size.\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10010, __PRETTY_FUNCTION__))
       "All operands must be the same size.")((LHS->getType()->getAs<VectorType>()->getNumElements
() == E->getType()->getAs<VectorType>()->getNumElements
() && RHS->getType()->getAs<VectorType>()
->getNumElements() == E->getType()->getAs<VectorType
>()->getNumElements() && "All operands must be the same size."
) ? static_cast<void> (0) : __assert_fail ("LHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && RHS->getType()->getAs<VectorType>()->getNumElements() == E->getType()->getAs<VectorType>()->getNumElements() && \"All operands must be the same size.\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10010, __PRETTY_FUNCTION__));

APValue LHSValue;
APValue RHSValue;
bool LHSOK = Evaluate(LHSValue, Info, LHS);
if (!LHSOK && !Info.noteFailure())
  return false;
if (!Evaluate(RHSValue, Info, RHS) || !LHSOK)
  return false;

if (!handleVectorVectorBinOp(Info, E, Op, LHSValue, RHSValue))
  return false;

return Success(LHSValue, E);
10024}

10026//===----------------------------------------------------------------------===//
10027// Array Evaluation
10028//===----------------------------------------------------------------------===//

10030namespace {
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10041, __PRETTY_FUNCTION__));
    Result = V;
    return true;
  }

  bool ZeroInitialization(const Expr *E) {
    const ConstantArrayType *CAT =
        Info.Ctx.getAsConstantArrayType(E->getType());
    if (!CAT) {
      if (E->getType()->isIncompleteArrayType()) {
        // We can be asked to zero-initialize a flexible array member; this
        // is represented as an ImplicitValueInitExpr of incomplete array
        // type. In this case, the array has zero elements.
        Result = APValue(APValue::UninitArray(), 0, 0);
        return true;
      }
      // FIXME: We could handle VLAs here.
      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;
  }
};
10088} // end anonymous namespace

10090static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10092, __PRETTY_FUNCTION__));
return ArrayExprEvaluator(Info, This, Result).Visit(E);
10094}

10096static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10100, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10100, __PRETTY_FUNCTION__));
return ArrayExprEvaluator(Info, This, Result)
    .VisitInitListExpr(ILE, AllocType);
10103}

10105static bool EvaluateArrayNewConstructExpr(EvalInfo &Info, LValue &This,
                                        APValue &Result,
                                        const CXXConstructExpr *CCE,
                                        QualType AllocType) {
assert(CCE->isRValue() && CCE->getType()->isArrayType() &&((CCE->isRValue() && CCE->getType()->isArrayType
() && "not an array rvalue") ? static_cast<void>
 (0) : __assert_fail ("CCE->isRValue() && CCE->getType()->isArrayType() && \"not an array rvalue\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10110, __PRETTY_FUNCTION__))
       "not an array rvalue")((CCE->isRValue() && CCE->getType()->isArrayType
() && "not an array rvalue") ? static_cast<void>
 (0) : __assert_fail ("CCE->isRValue() && CCE->getType()->isArrayType() && \"not an array rvalue\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10110, __PRETTY_FUNCTION__));
return ArrayExprEvaluator(Info, This, Result)
    .VisitCXXConstructExpr(CCE, This, &Result, AllocType);
10113}

10115// Return true iff the given array filler may depend on the element index.
10116static bool MaybeElementDependentArrayFiller(const Expr *FillerExpr) {
// For now, just allow 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;
10129}

10131bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10152, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10152, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10200, __PRETTY_FUNCTION__));
return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject,
                       FillerExpr) && Success;
10203}

10205bool 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;
10236}

10238bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) {
return VisitCXXConstructExpr(E, This, &Result, E->getType());
10240}

10242bool 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);
10280}

10282//===----------------------------------------------------------------------===//
10283// Integer Evaluation
10284//
10285// As a GNU extension, we support casting pointers to sufficiently-wide integer
10286// types and back in constant folding. Integer values are thus represented
10287// either as an integer-valued APValue, or as an lvalue-valued APValue.
10288//===----------------------------------------------------------------------===//

10290namespace {
10291class IntExprEvaluator
      : public ExprEvaluatorBase<IntExprEvaluator> {
APValue &Result;
10294public:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10300, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10300, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10302, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10302, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10304, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10304, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10314, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10314, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10316, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10316, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10328, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10328, __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 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);
bool VisitConceptSpecializationExpr(const ConceptSpecializationExpr *E);
bool VisitRequiresExpr(const RequiresExpr *E);
// FIXME: Missing: array subscript of vector, member of vector
10430};

10432class 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10455, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10457, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10457, __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);
10473};
10474} // end anonymous namespace

10476/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and
10477/// produce either the integer value or a pointer.
10478///
10479/// GCC has a heinous extension which folds casts between pointer types and
10480/// pointer-sized integral types. We support this by allowing the evaluation of
10481/// an integer rvalue to produce a pointer (represented as an lvalue) instead.
10482/// Some simple arithmetic on such values is supported (they are treated much
10483/// like char*).
10484static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10486, __PRETTY_FUNCTION__));
return IntExprEvaluator(Info, Result).Visit(E);
10488}

10490static 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;
10502}

10504bool IntExprEvaluator::VisitSourceLocExpr(const SourceLocExpr *E) {
APValue Evaluated = E->EvaluateInContext(
    Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr());
return Success(Evaluated, E);
10508}

10510static 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;
10523}

10525static 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;
10538}

10540/// Check whether the given declaration can be directly converted to an integral
10541/// rvalue. If not, no diagnostic is produced; there are other things we can
10542/// try.
10543bool 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;
10565}

10567/// Values returned by __builtin_classify_type, chosen to match the values
10568/// produced by GCC's builtin.
10569enum 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.
10595};

10597/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way
10598/// as GCC.
10599static GCCTypeClass
10600EvaluateBuiltinClassifyType(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10601, __PRETTY_FUNCTION__));

QualType CanTy = T.getCanonicalType();
const BuiltinType *BT = dyn_cast<BuiltinType>(CanTy);

switch (CanTy->getTypeClass()) {
10607#define TYPE(ID, BASE)
10608#define DEPENDENT_TYPE(ID, BASE) case Type::ID:
10609#define NON_CANONICAL_TYPE(ID, BASE) case Type::ID:
10610#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(ID, BASE) case Type::ID:
10611#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10614);

case Type::Builtin:
  switch (BT->getKind()) {
10618#define BUILTIN_TYPE(ID, SINGLETON_ID)
10619#define SIGNED_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: return GCCTypeClass::Integer;
10621#define FLOATING_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: return GCCTypeClass::RealFloat;
10623#define PLACEHOLDER_TYPE(ID, SINGLETON_ID) \
  case BuiltinType::ID: break;
10625#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:
10664#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
  case BuiltinType::Id:
10666#include "clang/Basic/OpenCLImageTypes.def"
10667#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
  case BuiltinType::Id:
10669#include "clang/Basic/OpenCLExtensionTypes.def"
  case BuiltinType::OCLSampler:
  case BuiltinType::OCLEvent:
  case BuiltinType::OCLClkEvent:
  case BuiltinType::OCLQueue:
  case BuiltinType::OCLReserveID:
10675#define SVE_TYPE(Name, Id, SingletonId) \
  case BuiltinType::Id:
10677#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10681);
  };
  llvm_unreachable("unexpected placeholder type")::llvm::llvm_unreachable_internal("unexpected placeholder type"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10683);

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::ConstantMatrix:
case Type::ObjCObject:
case Type::ObjCInterface:
case Type::ObjCObjectPointer:
case Type::Pipe:
case Type::ExtInt:
  // 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10728);
}

llvm_unreachable("unexpected type class")::llvm::llvm_unreachable_internal("unexpected type class", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10731);
10732}

10734/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way
10735/// as GCC.
10736static GCCTypeClass
10737EvaluateBuiltinClassifyType(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);
10747}

10749/// EvaluateBuiltinConstantPForLValue - Determine the result of
10750/// __builtin_constant_p when applied to the given pointer.
10751///
10752/// A pointer is only "constant" if it is null (or a pointer cast to integer)
10753/// or it points to the first character of a string literal.
10754static 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;
}
10771}

10773/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to
10774/// GCC as we can manage.
10775static 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) || Info.EvalStatus.HasSideEffects) {
    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;
10820}

10822/// Retrieves the "underlying object type" of the given expression,
10823/// as used by __builtin_object_size.
10824static 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.dyn_cast<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();
10838}

10840/// A more selective version of E->IgnoreParenCasts for
10841/// tryEvaluateBuiltinObjectSize. This ignores some casts/parens that serve only
10842/// to change the type of E.
10843/// Ex. For E = `(short*)((char*)(&foo))`, returns `&foo`
10844///
10845/// Always returns an RValue with a pointer representation.
10846static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10847, __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);
10865}

10867/// Checks to see if the given LValue's Designator is at the end of the LValue's
10868/// record layout. e.g.
10869///   struct { struct { int a, b; } fst, snd; } obj;
10870///   obj.fst   // no
10871///   obj.snd   // yes
10872///   obj.fst.a // no
10873///   obj.fst.b // no
10874///   obj.snd.a // no
10875///   obj.snd.b // yes
10876///
10877/// Please note: this function is specialized for how __builtin_object_size
10878/// views "objects".
10879///
10880/// If this encounters an invalid RecordDecl or otherwise cannot determine the
10881/// correct result, it will always return true.
10882static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10883, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 10945, __PRETTY_FUNCTION__));
    return false;
  }
}
return true;
10950}

10952/// Tests to see if the LValue has a user-specified designator (that isn't
10953/// necessarily valid). Note that this always returns 'true' if the LValue has
10954/// an unsized array as its first designator entry, because there's currently no
10955/// way to tell if the user typed *foo or foo[0].
10956static 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);
10970}

10972/// Attempts to detect a user writing into a piece of memory that's impossible
10973/// to figure out the size of by just using types.
10974static 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 list. 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 an explicit list approach would
//   be.
return LVal.InvalidBase &&
       Designator.Entries.size() == Designator.MostDerivedPathLength &&
       Designator.MostDerivedIsArrayElement &&
       isDesignatorAtObjectEnd(Ctx, LVal);
10991}

10993/// Converts the given APInt to CharUnits, assuming the APInt is unsigned.
10994/// Fails if the conversion would cause loss of precision.
10995static 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;
11002}

11004/// Helper for tryEvaluateBuiltinObjectSize -- Given an LValue, this will
11005/// determine how many bytes exist from the beginning of the object to either
11006/// the end of the current subobject, or the end of the object itself, depending
11007/// on what the LValue looks like + the value of Type.
11008///
11009/// If this returns false, the value of Result is undefined.
11010static 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;
11085}

11087/// Tries to evaluate the __builtin_object_size for @p E. If successful,
11088/// returns true and stores the result in @p Size.
11089///
11090/// If @p WasError is non-null, this will report whether the failure to evaluate
11091/// is to be treated as an Error in IntExprEvaluator.
11092static 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;
11133}

11135bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
if (unsigned BuiltinOp = E->getBuiltinCallee())
  return VisitBuiltinCallExpr(E, BuiltinOp);

return ExprEvaluatorBaseTy::VisitCallExpr(E);
11140}

11142static bool getBuiltinAlignArguments(const CallExpr *E, EvalInfo &Info,
                                   APValue &Val, APSInt &Alignment) {
QualType SrcTy = E->getArg(0)->getType();
if (!getAlignmentArgument(E->getArg(1), SrcTy, Info, Alignment))
  return false;
// Even though we are evaluating integer expressions we could get a pointer
// argument for the __builtin_is_aligned() case.
if (SrcTy->isPointerType()) {
  LValue Ptr;
  if (!EvaluatePointer(E->getArg(0), Ptr, Info))
    return false;
  Ptr.moveInto(Val);
} else if (!SrcTy->isIntegralOrEnumerationType()) {
  Info.FFDiag(E->getArg(0));
  return false;
} else {
  APSInt SrcInt;
  if (!EvaluateInteger(E->getArg(0), SrcInt, Info))
    return false;
  assert(SrcInt.getBitWidth() >= Alignment.getBitWidth() &&((SrcInt.getBitWidth() >= Alignment.getBitWidth() &&
 "Bit widths must be the same") ? static_cast<void> (0)
 : __assert_fail ("SrcInt.getBitWidth() >= Alignment.getBitWidth() && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11162, __PRETTY_FUNCTION__))
         "Bit widths must be the same")((SrcInt.getBitWidth() >= Alignment.getBitWidth() &&
 "Bit widths must be the same") ? static_cast<void> (0)
 : __assert_fail ("SrcInt.getBitWidth() >= Alignment.getBitWidth() && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11162, __PRETTY_FUNCTION__));
  Val = APValue(SrcInt);
}
assert(Val.hasValue())((Val.hasValue()) ? static_cast<void> (0) : __assert_fail
 ("Val.hasValue()", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11165, __PRETTY_FUNCTION__));
return true;
11167}

11169bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
                                          unsigned BuiltinOp) {
switch (BuiltinOp) {
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11180, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11202);
}

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_is_aligned: {
  APValue Src;
  APSInt Alignment;
  if (!getBuiltinAlignArguments(E, Info, Src, Alignment))
    return false;
  if (Src.isLValue()) {
    // If we evaluated a pointer, check the minimum known alignment.
    LValue Ptr;
    Ptr.setFrom(Info.Ctx, Src);
    CharUnits BaseAlignment = getBaseAlignment(Info, Ptr);
    CharUnits PtrAlign = BaseAlignment.alignmentAtOffset(Ptr.Offset);
    // We can return true if the known alignment at the computed offset is
    // greater than the requested alignment.
    assert(PtrAlign.isPowerOfTwo())((PtrAlign.isPowerOfTwo()) ? static_cast<void> (0) : __assert_fail
 ("PtrAlign.isPowerOfTwo()", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11224, __PRETTY_FUNCTION__));
    assert(Alignment.isPowerOf2())((Alignment.isPowerOf2()) ? static_cast<void> (0) : __assert_fail
 ("Alignment.isPowerOf2()", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11225, __PRETTY_FUNCTION__));
    if (PtrAlign.getQuantity() >= Alignment)
      return Success(1, E);
    // If the alignment is not known to be sufficient, some cases could still
    // be aligned at run time. However, if the requested alignment is less or
    // equal to the base alignment and the offset is not aligned, we know that
    // the run-time value can never be aligned.
    if (BaseAlignment.getQuantity() >= Alignment &&
        PtrAlign.getQuantity() < Alignment)
      return Success(0, E);
    // Otherwise we can't infer whether the value is sufficiently aligned.
    // TODO: __builtin_is_aligned(__builtin_align_{down,up{(expr, N), N)
    //  in cases where we can't fully evaluate the pointer.
    Info.FFDiag(E->getArg(0), diag::note_constexpr_alignment_compute)
        << Alignment;
    return false;
  }
  assert(Src.isInt())((Src.isInt()) ? static_cast<void> (0) : __assert_fail (
"Src.isInt()", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11242, __PRETTY_FUNCTION__));
  return Success((Src.getInt() & (Alignment - 1)) == 0 ? 1 : 0, E);
}
case Builtin::BI__builtin_align_up: {
  APValue Src;
  APSInt Alignment;
  if (!getBuiltinAlignArguments(E, Info, Src, Alignment))
    return false;
  if (!Src.isInt())
    return Error(E);
  APSInt AlignedVal =
      APSInt((Src.getInt() + (Alignment - 1)) & ~(Alignment - 1),
             Src.getInt().isUnsigned());
  assert(AlignedVal.getBitWidth() == Src.getInt().getBitWidth())((AlignedVal.getBitWidth() == Src.getInt().getBitWidth()) ? static_cast
<void> (0) : __assert_fail ("AlignedVal.getBitWidth() == Src.getInt().getBitWidth()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11255, __PRETTY_FUNCTION__));
  return Success(AlignedVal, E);
}
case Builtin::BI__builtin_align_down: {
  APValue Src;
  APSInt Alignment;
  if (!getBuiltinAlignArguments(E, Info, Src, Alignment))
    return false;
  if (!Src.isInt())
    return Error(E);
  APSInt AlignedVal =
      APSInt(Src.getInt() & ~(Alignment - 1), Src.getInt().isUnsigned());
  assert(AlignedVal.getBitWidth() == Src.getInt().getBitWidth())((AlignedVal.getBitWidth() == Src.getInt().getBitWidth()) ? static_cast
<void> (0) : __assert_fail ("AlignedVal.getBitWidth() == Src.getInt().getBitWidth()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11267, __PRETTY_FUNCTION__));
  return Success(AlignedVal, E);
}

case Builtin::BI__builtin_bitreverse8:
case Builtin::BI__builtin_bitreverse16:
case Builtin::BI__builtin_bitreverse32:
case Builtin::BI__builtin_bitreverse64: {
  APSInt Val;
  if (!EvaluateInteger(E->getArg(0), Val, Info))
    return false;

  return Success(Val.reverseBits(), 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: {
  const auto *Callee = Info.CurrentCall->getCallee();
  if (Info.InConstantContext && !Info.CheckingPotentialConstantExpression &&
      (Info.CallStackDepth == 1 ||
       (Info.CallStackDepth == 2 && Callee->isInStdNamespace() &&
        Callee->getIdentifier() &&
        Callee->getIdentifier()->isStr("is_constant_evaluated")))) {
    // FIXME: Find a better way to avoid duplicated diagnostics.
    if (Info.EvalStatus.Diag)
      Info.report((Info.CallStackDepth == 1) ? E->getExprLoc()
                                             : Info.CurrentCall->CallLoc,
                  diag::warn_is_constant_evaluated_always_true_constexpr)
          << (Info.CallStackDepth == 1 ? "__builtin_is_constant_evaluated"
                                       : "std::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:
case Builtin::BI__builtin_expect_with_probability:
  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::BI__builtin_rotateleft8:
case Builtin::BI__builtin_rotateleft16:
case Builtin::BI__builtin_rotateleft32:
case Builtin::BI__builtin_rotateleft64:
case Builtin::BI_rotl8: // Microsoft variants of rotate right
case Builtin::BI_rotl16:
case Builtin::BI_rotl:
case Builtin::BI_lrotl:
case Builtin::BI_rotl64: {
  APSInt Val, Amt;
  if (!EvaluateInteger(E->getArg(0), Val, Info) ||
      !EvaluateInteger(E->getArg(1), Amt, Info))
    return false;

  return Success(Val.rotl(Amt.urem(Val.getBitWidth())), E);
}

case Builtin::BI__builtin_rotateright8:
case Builtin::BI__builtin_rotateright16:
case Builtin::BI__builtin_rotateright32:
case Builtin::BI__builtin_rotateright64:
case Builtin::BI_rotr8: // Microsoft variants of rotate right
case Builtin::BI_rotr16:
case Builtin::BI_rotr:
case Builtin::BI_lrotr:
case Builtin::BI_rotr64: {
  APSInt Val, Amt;
  if (!EvaluateInteger(E->getArg(0), Val, Info) ||
      !EvaluateInteger(E->getArg(1), Amt, Info))
    return false;

  return Success(Val.rotr(Amt.urem(Val.getBitWidth())), 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11597, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11597, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11597, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11597, __PRETTY_FUNCTION__));

  // For memcmp, allow comparing any arrays of '[[un]signed] char' or
  // 'char8_t', but no other types.
  if (IsRawByte &&
      !(isOneByteCharacterType(CharTy1) && isOneByteCharacterType(CharTy2))) {
    // FIXME: Consider using our bit_cast implementation to support this.
    Info.FFDiag(E, diag::note_constexpr_memcmp_unsupported)
        << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'")
        << CharTy1 << CharTy2;
    return false;
  }

  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);
  };

  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().ne(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11645, __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 or equal to 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11761);
  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);
}
}
11818}

11820/// Determine whether this is a pointer past the end of the complete
11821/// object referred to by the lvalue.
11822static 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;
11845}

11847namespace {

11849/// Data recursive integer evaluator of certain binary operators.
11850///
11851/// We use a data recursive algorithm for binary operators so that we are able
11852/// to handle extreme cases of chained binary operators without causing stack
11853/// overflow.
11854class 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;

11890public:
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() ||
         (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;
}

11917private:
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;
}
11956};

11958}

11960bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11997, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 11997, __PRETTY_FUNCTION__));

if (LHSResult.Failed && !Info.noteFailure())
  return false; // Ignore RHS;

return true;
12003}

12005static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12010, __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);
12016}

12018bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12053, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12053, __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);
12110}

12112void 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12155);
12156}

12158namespace {
12159/// Used when we determine that we should fail, but can keep evaluating prior to
12160/// noting that we had a failure.
12161class DelayedNoteFailureRAII {
EvalInfo &Info;
bool NoteFailure;

12165public:
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12173, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12173, __PRETTY_FUNCTION__));
  }
}
12176};

12178enum class CmpResult {
Unequal,
Less,
Equal,
Greater,
Unordered,
12184};
12185}

12187template <class SuccessCB, class AfterCB>
12188static bool
12189EvaluateComparisonBinaryOperator(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12191, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12194, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12194, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12194, __PRETTY_FUNCTION__));
auto Error = [&](const Expr *E) {
  Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr);
  return false;
};

bool IsRelational = E->isRelationalOp() || E->getOpcode() == BO_Cmp;
bool IsEquality = E->isEqualityOp();

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(CmpResult::Less, E);
  if (LHS > RHS)
    return Success(CmpResult::Greater, E);
  return Success(CmpResult::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(CmpResult::Less, E);
  if (LHSFX > RHSFX)
    return Success(CmpResult::Greater, E);
  return Success(CmpResult::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 ? CmpResult::Equal : CmpResult::Unequal, 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12272, __PRETTY_FUNCTION__));
    bool IsEqual = LHS.getComplexIntReal() == RHS.getComplexIntReal() &&
                   LHS.getComplexIntImag() == RHS.getComplexIntImag();
    return Success(IsEqual ? CmpResult::Equal : CmpResult::Unequal, 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12290, __PRETTY_FUNCTION__));
  auto GetCmpRes = [&]() {
    switch (LHS.compare(RHS)) {
    case APFloat::cmpEqual:
      return CmpResult::Equal;
    case APFloat::cmpLessThan:
      return CmpResult::Less;
    case APFloat::cmpGreaterThan:
      return CmpResult::Greater;
    case APFloat::cmpUnordered:
      return CmpResult::Unordered;
    }
    llvm_unreachable("Unrecognised APFloat::cmpResult enum")::llvm::llvm_unreachable_internal("Unrecognised APFloat::cmpResult enum"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12302);
  };
  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) {
      Info.FFDiag(E, diag::note_constexpr_pointer_comparison_unspecified);
      return false;
    }
    // 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(CmpResult::Unequal, 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12420, __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(CmpResult::Less, E);
  if (CompareLHS > CompareRHS)
    return Success(CmpResult::Greater, E);
  return Success(CmpResult::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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12446, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12447, __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 ? CmpResult::Equal : CmpResult::Unequal, 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 ? CmpResult::Equal : CmpResult::Unequal, 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12484, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12485, __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(CmpResult::Equal, E);
}

return DoAfter();
12493}

12495bool RecordExprEvaluator::VisitBinCmp(const BinaryOperator *E) {
if (!CheckLiteralType(Info, E))
  return false;

auto OnSuccess = [&](CmpResult CR, const BinaryOperator *E) {
  ComparisonCategoryResult CCR;
  switch (CR) {
  case CmpResult::Unequal:
    llvm_unreachable("should never produce Unequal for three-way comparison")::llvm::llvm_unreachable_internal("should never produce Unequal for three-way comparison"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12503);
  case CmpResult::Less:
    CCR = ComparisonCategoryResult::Less;
    break;
  case CmpResult::Equal:
    CCR = ComparisonCategoryResult::Equal;
    break;
  case CmpResult::Greater:
    CCR = ComparisonCategoryResult::Greater;
    break;
  case CmpResult::Unordered:
    CCR = ComparisonCategoryResult::Unordered;
    break;
  }
  // 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(CCR))->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);
});
12532}

12534bool 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())
  return Error(E);

DelayedNoteFailureRAII MaybeNoteFailureLater(Info, E->isAssignmentOp());
if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E))
  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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12546, __PRETTY_FUNCTION__))
        !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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12546, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12546, __PRETTY_FUNCTION__));

if (E->isComparisonOp()) {
  // Evaluate builtin binary comparisons by evaluating them as three-way
  // comparisons and then translating the result.
  auto OnSuccess = [&](CmpResult CR, const BinaryOperator *E) {
    assert((CR != CmpResult::Unequal || E->isEqualityOp()) &&(((CR != CmpResult::Unequal || E->isEqualityOp()) &&
 "should only produce Unequal for equality comparisons") ? static_cast
<void> (0) : __assert_fail ("(CR != CmpResult::Unequal || E->isEqualityOp()) && \"should only produce Unequal for equality comparisons\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12553, __PRETTY_FUNCTION__))
           "should only produce Unequal for equality comparisons")(((CR != CmpResult::Unequal || E->isEqualityOp()) &&
 "should only produce Unequal for equality comparisons") ? static_cast
<void> (0) : __assert_fail ("(CR != CmpResult::Unequal || E->isEqualityOp()) && \"should only produce Unequal for equality comparisons\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12553, __PRETTY_FUNCTION__));
    bool IsEqual   = CR == CmpResult::Equal,
         IsLess    = CR == CmpResult::Less,
         IsGreater = CR == CmpResult::Greater;
    auto Op = E->getOpcode();
    switch (Op) {
    default:
      llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12560);
    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() &&
    E->getOpcode() == BO_Sub) {
  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)) {
    // 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 &&
      !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->castAs<PointerType>()->getPointeeType();

  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);
12666}

12668/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with
12669/// a result as the expression's type.
12670bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12712, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12720);
12721}

12723bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12755, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12762);

  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);
12790}

12792bool 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);
}
}
12829}

12831/// HandleCast - This is used to evaluate implicit or explicit casts where the
12832/// result type is integer.
12833bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12875);

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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12975);

  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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 12999);
13000}

13002bool 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());
13013}

13015bool 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);
13027}

13029bool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) {
return Success(E->getPackLength(), E);
13031}

13033bool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
return Success(E->getValue(), E);
13035}

13037bool IntExprEvaluator::VisitConceptSpecializationExpr(
     const ConceptSpecializationExpr *E) {
return Success(E->isSatisfied(), E);
13040}

13042bool IntExprEvaluator::VisitRequiresExpr(const RequiresExpr *E) {
return Success(E->isSatisfied(), E);
13044}

13046bool 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);
  }
}
13071}

13073bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13077, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13077, __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) {
    if (Info.checkingForUndefinedBehavior())
      Info.Ctx.getDiagnostics().Report(E->getExprLoc(),
                                       diag::warn_fixedpoint_constant_overflow)
        << Result.toString() << E->getType();
    else if (!HandleOverflow(Info, E, Result, E->getType()))
      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) {
    if (Info.checkingForUndefinedBehavior())
      Info.Ctx.getDiagnostics().Report(E->getExprLoc(),
                                       diag::warn_fixedpoint_constant_overflow)
        << IntResult.toString() << E->getType();
    else if (!HandleOverflow(Info, E, IntResult, E->getType()))
      return false;
  }

  return Success(IntResult, E);
}
case CK_NoOp:
case CK_LValueToRValue:
  return ExprEvaluatorBaseTy::VisitCastExpr(E);
default:
  return Error(E);
}
13123}

13125bool FixedPointExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma)
  return ExprEvaluatorBaseTy::VisitBinaryOperator(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;

bool OpOverflow = false, ConversionOverflow = false;
APFixedPoint Result(LHSFX.getSemantics());
switch (E->getOpcode()) {
case BO_Add: {
  Result = LHSFX.add(RHSFX, &OpOverflow)
                .convert(ResultFXSema, &ConversionOverflow);
  break;
}
case BO_Sub: {
  Result = LHSFX.sub(RHSFX, &OpOverflow)
                .convert(ResultFXSema, &ConversionOverflow);
  break;
}
case BO_Mul: {
  Result = LHSFX.mul(RHSFX, &OpOverflow)
                .convert(ResultFXSema, &ConversionOverflow);
  break;
}
case BO_Div: {
  if (RHSFX.getValue() == 0) {
    Info.FFDiag(E, diag::note_expr_divide_by_zero);
    return false;
  }
  Result = LHSFX.div(RHSFX, &OpOverflow)
                .convert(ResultFXSema, &ConversionOverflow);
  break;
}
case BO_Shl:
case BO_Shr: {
  FixedPointSemantics LHSSema = LHSFX.getSemantics();
  llvm::APSInt RHSVal = RHSFX.getValue();

  unsigned ShiftBW =
      LHSSema.getWidth() - (unsigned)LHSSema.hasUnsignedPadding();
  unsigned Amt = RHSVal.getLimitedValue(ShiftBW - 1);
  // Embedded-C 4.1.6.2.2:
  //   The right operand must be nonnegative and less than the total number
  //   of (nonpadding) bits of the fixed-point operand ...
  if (RHSVal.isNegative())
    Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHSVal;
  else if (Amt != RHSVal)
    Info.CCEDiag(E, diag::note_constexpr_large_shift)
        << RHSVal << E->getType() << ShiftBW;

  if (E->getOpcode() == BO_Shl)
    Result = LHSFX.shl(Amt, &OpOverflow);
  else
    Result = LHSFX.shr(Amt, &OpOverflow);
  break;
}
default:
  return false;
}
if (OpOverflow || ConversionOverflow) {
  if (Info.checkingForUndefinedBehavior())
    Info.Ctx.getDiagnostics().Report(E->getExprLoc(),
                                     diag::warn_fixedpoint_constant_overflow)
      << Result.toString() << E->getType();
  else if (!HandleOverflow(Info, E, Result, E->getType()))
    return false;
}
return Success(Result, E);
13203}

13205//===----------------------------------------------------------------------===//
13206// Float Evaluation
13207//===----------------------------------------------------------------------===//

13209namespace {
13210class FloatExprEvaluator
: public ExprEvaluatorBase<FloatExprEvaluator> {
APFloat &Result;
13213public:
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
13238};
13239} // end anonymous namespace

13241static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13242, __PRETTY_FUNCTION__));
return FloatExprEvaluator(Info, Result).Visit(E);
13244}

13246static 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;
13282}

13284bool 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;
}
}
13350}

13352bool 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());
13362}

13364bool 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;
13377}

13379bool 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;
}
13390}

13392bool 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);
13402}

13404bool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) {
Result = E->getValue();
return true;
13407}

13409bool 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;
}
}
13438}

13440//===----------------------------------------------------------------------===//
13441// Complex Evaluation (for float and integer)
13442//===----------------------------------------------------------------------===//

13444namespace {
13445class ComplexExprEvaluator
: public ExprEvaluatorBase<ComplexExprEvaluator> {
ComplexValue &Result;

13449public:
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);
bool VisitCallExpr(const CallExpr *E);
13470};
13471} // end anonymous namespace

13473static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13475, __PRETTY_FUNCTION__));
return ComplexExprEvaluator(Info, Result).Visit(E);
13477}

13479bool 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;
13493}

13495bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13508, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13508, __PRETTY_FUNCTION__));

  Result.makeComplexInt();
  APSInt &Imag = Result.IntImag;
  if (!EvaluateInteger(SubExpr, Imag, Info))
    return false;

  Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned());
  return true;
}
13518}

13520bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13572);

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()->castAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->castAs<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()->castAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->castAs<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()->castAs<ComplexType>()->getElementType();
  QualType From
    = E->getSubExpr()->getType()->castAs<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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13659);
13660}

13662bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13697, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13697, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13744, __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;
13884}

13886bool 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;
}
13916}

13918bool 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);
13936}

13938bool ComplexExprEvaluator::VisitCallExpr(const CallExpr *E) {
switch (E->getBuiltinCallee()) {
case Builtin::BI__builtin_complex:
  Result.makeComplexFloat();
  if (!EvaluateFloat(E->getArg(0), Result.FloatReal, Info))
    return false;
  if (!EvaluateFloat(E->getArg(1), Result.FloatImag, Info))
    return false;
  return true;

default:
  break;
}

return ExprEvaluatorBaseTy::VisitCallExpr(E);
13953}

13955//===----------------------------------------------------------------------===//
13956// Atomic expression evaluation, essentially just handling the NonAtomicToAtomic
13957// implicit conversion.
13958//===----------------------------------------------------------------------===//

13960namespace {
13961class AtomicExprEvaluator :
  public ExprEvaluatorBase<AtomicExprEvaluator> {
const LValue *This;
APValue &Result;
13965public:
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());
  }
}
13992};
13993} // end anonymous namespace

13995static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 13997, __PRETTY_FUNCTION__));
return AtomicExprEvaluator(Info, This, Result).Visit(E);
13999}

14001//===----------------------------------------------------------------------===//
14002// Void expression evaluation, primarily for a cast to void on the LHS of a
14003// comma operator
14004//===----------------------------------------------------------------------===//

14006namespace {
14007class VoidExprEvaluator
: public ExprEvaluatorBase<VoidExprEvaluator> {
14009public:
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()) {
  case Builtin::BI__assume:
  case Builtin::BI__builtin_assume:
    // The argument is not evaluated!
    return true;

  case Builtin::BI__builtin_operator_delete:
    return HandleOperatorDeleteCall(Info, E);

  default:
    break;
  }

  return ExprEvaluatorBaseTy::VisitCallExpr(E);
}

bool VisitCXXDeleteExpr(const CXXDeleteExpr *E);
14044};
14045} // end anonymous namespace

14047bool 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().CPlusPlus20)
    Info.CCEDiag(E, diag::note_constexpr_new);
  return true;
}

Optional<DynAlloc *> Alloc = CheckDeleteKind(
    Info, E, Pointer, E->isArrayForm() ? DynAlloc::ArrayNew : DynAlloc::New);
if (!Alloc)
  return false;
QualType AllocType = Pointer.Base.getDynamicAllocType();

// 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;
}

// For a class type with a virtual destructor, the selected operator delete
// is the one looked up when building the destructor.
if (!E->isArrayForm() && !E->isGlobalDelete()) {
  const FunctionDecl *VirtualDelete = getVirtualOperatorDelete(AllocType);
  if (VirtualDelete &&
      !VirtualDelete->isReplaceableGlobalAllocationFunction()) {
    Info.FFDiag(E, diag::note_constexpr_new_non_replaceable)
        << isa<CXXMethodDecl>(VirtualDelete) << VirtualDelete;
    return false;
  }
}

if (!HandleDestruction(Info, E->getExprLoc(), Pointer.getLValueBase(),
                       (*Alloc)->Value, AllocType))
  return false;

if (!Info.HeapAllocs.erase(Pointer.Base.dyn_cast<DynamicAllocLValue>())) {
  // 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;
14118}

14120static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14121, __PRETTY_FUNCTION__));
return VoidExprEvaluator(Info).Visit(E);
14123}

14125//===----------------------------------------------------------------------===//
14126// Top level Expr::EvaluateAsRValue method.
14127//===----------------------------------------------------------------------===//

14129static 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;
14206}

14208/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some
14209/// cases, the in-place evaluation is essential, since later initializers for
14210/// an object can indirectly refer to subobjects which were initialized earlier.
14211static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14213, __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);
14235}

14237/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit
14238/// lvalue-to-rvalue cast if it is an lvalue.
14239static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) {
if (Info.EnableNewConstInterp) {
  if (!Info.Ctx.getInterpContext().evaluateAsRValue(Info, E, Result))
    return false;
} else {
  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);
14264}

14266static 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;
14293}

14295static bool hasUnacceptableSideEffect(Expr::EvalStatus &Result,
                                    Expr::SideEffectsKind SEK) {
return (SEK < Expr::SE_AllowSideEffects && Result.HasSideEffects) ||
       (SEK < Expr::SE_AllowUndefinedBehavior && Result.HasUndefinedBehavior);
14299}

14301static 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);
14308}

14310static 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;
14323}

14325static 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;
14340}

14342/// EvaluateAsRValue - Return true if this is a constant which we can fold using
14343/// any crazy technique (that has nothing to do with language standards) that
14344/// we want to.  If this function returns true, it returns the folded constant
14345/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion
14346/// will be applied to the result.
14347bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14350, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14350, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsRValue(this, Result, Ctx, Info);
14354}

14356bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14359, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14359, __PRETTY_FUNCTION__));
EvalResult Scratch;
return EvaluateAsRValue(Scratch, Ctx, InConstantContext) &&
       HandleConversionToBool(Scratch.Val, Result);
14363}

14365bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14369, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14369, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsInt(this, Result, Ctx, AllowSideEffects, Info);
14373}

14375bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14379, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14379, __PRETTY_FUNCTION__));
EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects);
Info.InConstantContext = InConstantContext;
return ::EvaluateAsFixedPoint(this, Result, Ctx, AllowSideEffects, Info);
14383}

14385bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14389, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14389, __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;
14402}

14404bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14407, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14407, __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;
14422}

14424bool Expr::EvaluateAsConstantExpr(EvalResult &Result, ConstExprUsage Usage,
                                const ASTContext &Ctx, bool InPlace) 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14427, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14427, __PRETTY_FUNCTION__));

EvalInfo::EvaluationMode EM = EvalInfo::EM_ConstantExpression;
EvalInfo Info(Ctx, Result, EM);
Info.InConstantContext = true;

if (InPlace) {
  Info.setEvaluatingDecl(this, Result.Val);
  LValue LVal;
  LVal.set(this);
  if (!::EvaluateInPlace(Result.Val, Info, LVal, this) ||
      Result.HasSideEffects)
    return false;
} else 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14444);

return CheckConstantExpression(Info, getExprLoc(), getStorageType(Ctx, this),
                               Result.Val, Usage) &&
       CheckMemoryLeaks(Info);
14449}

14451bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14455, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14455, __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();
  if (!InterpCtx.evaluateAsInitializer(Info, VD, Value))
    return false;
} else {
  LValue LVal;
  LVal.set(VD);

  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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14493);
}
return CheckConstantExpression(Info, DeclLoc, DeclTy, Value) &&
       CheckMemoryLeaks(Info);
14497}

14499bool VarDecl::evaluateDestruction(
  SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
Expr::EvalStatus EStatus;
EStatus.Diag = &Notes;

// Make a copy of the value for the destructor to mutate, if we know it.
// Otherwise, treat the value as default-initialized; if the destructor works
// anyway, then the destruction is constant (and must be essentially empty).
APValue DestroyedValue;
if (getEvaluatedValue() && !getEvaluatedValue()->isAbsent())
  DestroyedValue = *getEvaluatedValue();
else if (!getDefaultInitValue(getType(), DestroyedValue))
  return false;

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);

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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14529);

ensureEvaluatedStmt()->HasConstantDestruction = true;
return true;
14533}

14535/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
14536/// constant folded, but discard the result.
14537bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14539, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14539, __PRETTY_FUNCTION__));

EvalResult Result;
return EvaluateAsRValue(Result, Ctx, /* in constant context */ true) &&
       !hasUnacceptableSideEffect(Result, SEK);
14544}

14546APSInt 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14549, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14549, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14558, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14559, __PRETTY_FUNCTION__));

return EVResult.Val.getInt();
14562}

14564APSInt 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14567, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14567, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14577, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14578, __PRETTY_FUNCTION__));

return EVResult.Val.getInt();
14581}

14583void 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14585, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14585, __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);
}
14594}

14596bool Expr::EvalResult::isGlobalLValue() const {
assert(Val.isLValue())((Val.isLValue()) ? static_cast<void> (0) : __assert_fail
 ("Val.isLValue()", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14597, __PRETTY_FUNCTION__));
return IsGlobalLValue(Val.getLValueBase());
14599}


14602/// isIntegerConstantExpr - this recursive routine will test if an expression is
14603/// an integer constant expression.

14605/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
14606/// comma, etc

14608// CheckICE - This function does the fundamental ICE checking: the returned
14609// ICEDiag contains an ICEKind indicating whether the expression is an ICE,
14610// and a (possibly null) SourceLocation indicating the location of the problem.
14611//
14612// Note that to reduce code duplication, this helper does no evaluation
14613// itself; the caller checks whether the expression is evaluatable, and
14614// in the rare cases where CheckICE actually cares about the evaluated
14615// value, it calls into Evaluate.

14617namespace {

14619enum 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
14628};

14630struct ICEDiag {
ICEKind Kind;
SourceLocation Loc;

ICEDiag(ICEKind IK, SourceLocation l) : Kind(IK), Loc(l) {}
14635};

14637}

14639static ICEDiag NoDiag() { return ICEDiag(IK_ICE, SourceLocation()); }

14641static ICEDiag Worst(ICEDiag A, ICEDiag B) { return A.Kind >= B.Kind ? A : B; }

14643static 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();
14654}

14656static 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14657, __PRETTY_FUNCTION__));
if (!E->getType()->isIntegralOrEnumerationType())
  return ICEDiag(IK_NotICE, E->getBeginLoc());

switch (E->getStmtClass()) {
14662#define ABSTRACT_STMT(Node)
14663#define STMT(Node, Base) case Expr::Node##Class:
14664#define EXPR(Node, Base)
14665#include "clang/AST/StmtNodes.inc"
case Expr::PredefinedExprClass:
case Expr::FloatingLiteralClass:
case Expr::ImaginaryLiteralClass:
case Expr::StringLiteralClass:
case Expr::ArraySubscriptExprClass:
case Expr::MatrixSubscriptExprClass:
case Expr::OMPArraySectionExprClass:
case Expr::OMPArrayShapingExprClass:
case Expr::OMPIteratorExprClass:
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::CXXAddrspaceCastExprClass:
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::RecoveryExprClass:
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::ConceptSpecializationExprClass:
case Expr::RequiresExprClass:
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::CXXRewrittenBinaryOperatorClass:
  return CheckICE(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm(),
                  Ctx);
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14856);
}
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 14960);
}
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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15056);
15057}

15059/// Evaluate an expression as a C++11 integral constant expression.
15060static 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;
15080}

15082bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15085, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15085, __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;
15096}

15098Optional<llvm::APSInt> Expr::getIntegerConstantExpr(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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15102, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15102, __PRETTY_FUNCTION__));

APSInt Value;

if (Ctx.getLangOpts().CPlusPlus11) {
  if (EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc))
    return Value;
  return None;
}

if (!isIntegerConstantExpr(Ctx, Loc))
  return None;

// 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15125);

return ExprResult.Val.getInt();
15128}

15130bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15132, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15132, __PRETTY_FUNCTION__));

return CheckICE(this, Ctx).Kind == IK_ICE;
15135}

15137bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15140, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15140, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15144, __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;
15168}

15170bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15175, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15175, __PRETTY_FUNCTION__));

Expr::EvalStatus Status;
EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpressionUnevaluated);
Info.InConstantContext = true;

LValue ThisVal;
const LValue *ThisPtr = nullptr;
if (This) {
15184#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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15186, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15187, __PRETTY_FUNCTION__));
15188#endif
  if (!This->isValueDependent() &&
      EvaluateObjectArgument(Info, This, ThisVal) &&
      !Info.EvalStatus.HasSideEffects)
    ThisPtr = &ThisVal;

  // Ignore any side-effects from a failed evaluation. This is safe because
  // they can't interfere with any other argument evaluation.
  Info.EvalStatus.HasSideEffects = 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) ||
      Info.EvalStatus.HasSideEffects)
    // If evaluation fails, throw away the argument entirely.
    ArgValues[I - Args.begin()] = APValue();

  // Ignore any side-effects from a failed evaluation. This is safe because
  // they can't interfere with any other argument evaluation.
  Info.EvalStatus.HasSideEffects = false;
}

// Parameter cleanups happen in the caller and are not part of this
// evaluation.
Info.discardCleanups();
Info.EvalStatus.HasSideEffects = false;

// Build fake call to Callee.
CallStackFrame Frame(Info, Callee->getLocation(), Callee, ThisPtr,
                     ArgValues.data());
// FIXME: Missing ExprWithCleanups in enable_if conditions?
FullExpressionRAII Scope(Info);
return Evaluate(Value, Info, this) && Scope.destroy() &&
       !Info.EvalStatus.HasSideEffects;
15225}

15227bool 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;

// Bail out if a constexpr constructor has an initializer that contains an
// error. We deliberately don't produce a diagnostic, as we have produced a
// relevant diagnostic when parsing the error initializer.
if (const auto *Ctor = dyn_cast<CXXConstructorDecl>(FD)) {
  for (const auto *InitExpr : Ctor->inits()) {
    if (InitExpr->getInit() && InitExpr->getInit()->containsErrors())
      return false;
  }
}
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) {
  Info.Ctx.getInterpContext().isPotentialConstantExpr(Info, FD);
  return Diags.empty();
}

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();
15282}

15284bool 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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15289, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15289, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15305, __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-12~++20200927111121+5811d723998/clang/lib/AST/ExprConstant.cpp"
, 15305, __PRETTY_FUNCTION__));
CallStackFrame Frame(Info, SourceLocation(), FD, nullptr, ArgValues.data());

APValue ResultScratch;
Evaluate(ResultScratch, Info, E);
return Diags.empty();
15311}

15313bool 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);
15321}

←

/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h

1//===- Decl.h - Classes for representing declarations -----------*- 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 Decl subclasses.
10//
11//===----------------------------------------------------------------------===//

13#ifndef LLVM_CLANG_AST_DECL_H
14#define LLVM_CLANG_AST_DECL_H

16#include "clang/AST/APValue.h"
17#include "clang/AST/ASTContextAllocate.h"
18#include "clang/AST/DeclAccessPair.h"
19#include "clang/AST/DeclBase.h"
20#include "clang/AST/DeclarationName.h"
21#include "clang/AST/ExternalASTSource.h"
22#include "clang/AST/NestedNameSpecifier.h"
23#include "clang/AST/Redeclarable.h"
24#include "clang/AST/Type.h"
25#include "clang/Basic/AddressSpaces.h"
26#include "clang/Basic/Diagnostic.h"
27#include "clang/Basic/IdentifierTable.h"
28#include "clang/Basic/LLVM.h"
29#include "clang/Basic/Linkage.h"
30#include "clang/Basic/OperatorKinds.h"
31#include "clang/Basic/PartialDiagnostic.h"
32#include "clang/Basic/PragmaKinds.h"
33#include "clang/Basic/SourceLocation.h"
34#include "clang/Basic/Specifiers.h"
35#include "clang/Basic/Visibility.h"
36#include "llvm/ADT/APSInt.h"
37#include "llvm/ADT/ArrayRef.h"
38#include "llvm/ADT/Optional.h"
39#include "llvm/ADT/PointerIntPair.h"
40#include "llvm/ADT/PointerUnion.h"
41#include "llvm/ADT/StringRef.h"
42#include "llvm/ADT/iterator_range.h"
43#include "llvm/Support/Casting.h"
44#include "llvm/Support/Compiler.h"
45#include "llvm/Support/TrailingObjects.h"
46#include <cassert>
47#include <cstddef>
48#include <cstdint>
49#include <string>
50#include <utility>

52namespace clang {

54class ASTContext;
55struct ASTTemplateArgumentListInfo;
56class Attr;
57class CompoundStmt;
58class DependentFunctionTemplateSpecializationInfo;
59class EnumDecl;
60class Expr;
61class FunctionTemplateDecl;
62class FunctionTemplateSpecializationInfo;
63class FunctionTypeLoc;
64class LabelStmt;
65class MemberSpecializationInfo;
66class Module;
67class NamespaceDecl;
68class ParmVarDecl;
69class RecordDecl;
70class Stmt;
71class StringLiteral;
72class TagDecl;
73class TemplateArgumentList;
74class TemplateArgumentListInfo;
75class TemplateParameterList;
76class TypeAliasTemplateDecl;
77class TypeLoc;
78class UnresolvedSetImpl;
79class VarTemplateDecl;

81/// The top declaration context.
82class TranslationUnitDecl : public Decl, public DeclContext {
ASTContext &Ctx;

/// The (most recently entered) anonymous namespace for this
/// translation unit, if one has been created.
NamespaceDecl *AnonymousNamespace = nullptr;

explicit TranslationUnitDecl(ASTContext &ctx);

virtual void anchor();

93public:
ASTContext &getASTContext() const { return Ctx; }

NamespaceDecl *getAnonymousNamespace() const { return AnonymousNamespace; }
void setAnonymousNamespace(NamespaceDecl *D) { AnonymousNamespace = D; }

static TranslationUnitDecl *Create(ASTContext &C);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TranslationUnit; }
static DeclContext *castToDeclContext(const TranslationUnitDecl *D) {
  return static_cast<DeclContext *>(const_cast<TranslationUnitDecl*>(D));
}
static TranslationUnitDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<TranslationUnitDecl *>(const_cast<DeclContext*>(DC));
}
110};

112/// Represents a `#pragma comment` line. Always a child of
113/// TranslationUnitDecl.
114class PragmaCommentDecl final
  : public Decl,
    private llvm::TrailingObjects<PragmaCommentDecl, char> {
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

PragmaMSCommentKind CommentKind;

PragmaCommentDecl(TranslationUnitDecl *TU, SourceLocation CommentLoc,
                  PragmaMSCommentKind CommentKind)
    : Decl(PragmaComment, TU, CommentLoc), CommentKind(CommentKind) {}

virtual void anchor();

129public:
static PragmaCommentDecl *Create(const ASTContext &C, TranslationUnitDecl *DC,
                                 SourceLocation CommentLoc,
                                 PragmaMSCommentKind CommentKind,
                                 StringRef Arg);
static PragmaCommentDecl *CreateDeserialized(ASTContext &C, unsigned ID,
                                             unsigned ArgSize);

PragmaMSCommentKind getCommentKind() const { return CommentKind; }

StringRef getArg() const { return getTrailingObjects<char>(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == PragmaComment; }
144};

146/// Represents a `#pragma detect_mismatch` line. Always a child of
147/// TranslationUnitDecl.
148class PragmaDetectMismatchDecl final
  : public Decl,
    private llvm::TrailingObjects<PragmaDetectMismatchDecl, char> {
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

size_t ValueStart;

PragmaDetectMismatchDecl(TranslationUnitDecl *TU, SourceLocation Loc,
                         size_t ValueStart)
    : Decl(PragmaDetectMismatch, TU, Loc), ValueStart(ValueStart) {}

virtual void anchor();

163public:
static PragmaDetectMismatchDecl *Create(const ASTContext &C,
                                        TranslationUnitDecl *DC,
                                        SourceLocation Loc, StringRef Name,
                                        StringRef Value);
static PragmaDetectMismatchDecl *
CreateDeserialized(ASTContext &C, unsigned ID, unsigned NameValueSize);

StringRef getName() const { return getTrailingObjects<char>(); }
StringRef getValue() const { return getTrailingObjects<char>() + ValueStart; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == PragmaDetectMismatch; }
177};

179/// Declaration context for names declared as extern "C" in C++. This
180/// is neither the semantic nor lexical context for such declarations, but is
181/// used to check for conflicts with other extern "C" declarations. Example:
182///
183/// \code
184///   namespace N { extern "C" void f(); } // #1
185///   void N::f() {}                       // #2
186///   namespace M { extern "C" void f(); } // #3
187/// \endcode
188///
189/// The semantic context of #1 is namespace N and its lexical context is the
190/// LinkageSpecDecl; the semantic context of #2 is namespace N and its lexical
191/// context is the TU. However, both declarations are also visible in the
192/// extern "C" context.
193///
194/// The declaration at #3 finds it is a redeclaration of \c N::f through
195/// lookup in the extern "C" context.
196class ExternCContextDecl : public Decl, public DeclContext {
explicit ExternCContextDecl(TranslationUnitDecl *TU)
  : Decl(ExternCContext, TU, SourceLocation()),
    DeclContext(ExternCContext) {}

virtual void anchor();

203public:
static ExternCContextDecl *Create(const ASTContext &C,
                                  TranslationUnitDecl *TU);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ExternCContext; }
static DeclContext *castToDeclContext(const ExternCContextDecl *D) {
  return static_cast<DeclContext *>(const_cast<ExternCContextDecl*>(D));
}
static ExternCContextDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<ExternCContextDecl *>(const_cast<DeclContext*>(DC));
}
216};

218/// This represents a decl that may have a name.  Many decls have names such
219/// as ObjCMethodDecl, but not \@class, etc.
220///
221/// Note that not every NamedDecl is actually named (e.g., a struct might
222/// be anonymous), and not every name is an identifier.
223class NamedDecl : public Decl {
/// The name of this declaration, which is typically a normal
/// identifier but may also be a special kind of name (C++
/// constructor, Objective-C selector, etc.)
DeclarationName Name;

virtual void anchor();

231private:
NamedDecl *getUnderlyingDeclImpl() LLVM_READONLY__attribute__((__pure__));

234protected:
NamedDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N)
    : Decl(DK, DC, L), Name(N) {}

238public:
/// Get the identifier that names this declaration, if there is one.
///
/// This will return NULL if this declaration has no name (e.g., for
/// an unnamed class) or if the name is a special name (C++ constructor,
/// Objective-C selector, etc.).
IdentifierInfo *getIdentifier() const { return Name.getAsIdentifierInfo(); }

/// Get the name of identifier for this declaration as a StringRef.
///
/// This requires that the declaration have a name and that it be a simple
/// identifier.
StringRef getName() const {
  assert(Name.isIdentifier() && "Name is not a simple identifier")((Name.isIdentifier() && "Name is not a simple identifier"
) ? static_cast<void> (0) : __assert_fail ("Name.isIdentifier() && \"Name is not a simple identifier\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 251, __PRETTY_FUNCTION__));
  return getIdentifier() ? getIdentifier()->getName() : "";
}

/// Get a human-readable name for the declaration, even if it is one of the
/// special kinds of names (C++ constructor, Objective-C selector, etc).
///
/// Creating this name requires expensive string manipulation, so it should
/// be called only when performance doesn't matter. For simple declarations,
/// getNameAsCString() should suffice.
//
// FIXME: This function should be renamed to indicate that it is not just an
// alternate form of getName(), and clients should move as appropriate.
//
// FIXME: Deprecated, move clients to getName().
std::string getNameAsString() const { return Name.getAsString(); }

/// Pretty-print the unqualified name of this declaration. Can be overloaded
/// by derived classes to provide a more user-friendly name when appropriate.
virtual void printName(raw_ostream &os) const;

/// Get the actual, stored name of the declaration, which may be a special
/// name.
///
/// Note that generally in diagnostics, the non-null \p NamedDecl* itself
/// should be sent into the diagnostic instead of using the result of
/// \p getDeclName().
///
/// A \p DeclarationName in a diagnostic will just be streamed to the output,
/// which will directly result in a call to \p DeclarationName::print.
///
/// A \p NamedDecl* in a diagnostic will also ultimately result in a call to
/// \p DeclarationName::print, but with two customisation points along the
/// way (\p getNameForDiagnostic and \p printName). These are used to print
/// the template arguments if any, and to provide a user-friendly name for
/// some entities (such as unnamed variables and anonymous records).
DeclarationName getDeclName() const { return Name; }

/// Set the name of this declaration.
void setDeclName(DeclarationName N) { Name = N; }

/// Returns a human-readable qualified name for this declaration, like
/// A::B::i, for i being member of namespace A::B.
///
/// If the declaration is not a member of context which can be named (record,
/// namespace), it will return the same result as printName().
///
/// Creating this name is expensive, so it should be called only when
/// performance doesn't matter.
void printQualifiedName(raw_ostream &OS) const;
void printQualifiedName(raw_ostream &OS, const PrintingPolicy &Policy) const;

/// Print only the nested name specifier part of a fully-qualified name,
/// including the '::' at the end. E.g.
///    when `printQualifiedName(D)` prints "A::B::i",
///    this function prints "A::B::".
void printNestedNameSpecifier(raw_ostream &OS) const;
void printNestedNameSpecifier(raw_ostream &OS,
                              const PrintingPolicy &Policy) const;

// FIXME: Remove string version.
std::string getQualifiedNameAsString() const;

/// Appends a human-readable name for this declaration into the given stream.
///
/// This is the method invoked by Sema when displaying a NamedDecl
/// in a diagnostic.  It does not necessarily produce the same
/// result as printName(); for example, class template
/// specializations are printed with their template arguments.
virtual void getNameForDiagnostic(raw_ostream &OS,
                                  const PrintingPolicy &Policy,
                                  bool Qualified) const;

/// Determine whether this declaration, if known to be well-formed within
/// its context, will replace the declaration OldD if introduced into scope.
///
/// A declaration will replace another declaration if, for example, it is
/// a redeclaration of the same variable or function, but not if it is a
/// declaration of a different kind (function vs. class) or an overloaded
/// function.
///
/// \param IsKnownNewer \c true if this declaration is known to be newer
/// than \p OldD (for instance, if this declaration is newly-created).
bool declarationReplaces(NamedDecl *OldD, bool IsKnownNewer = true) const;

/// Determine whether this declaration has linkage.
bool hasLinkage() const;

using Decl::isModulePrivate;
using Decl::setModulePrivate;

/// Determine whether this declaration is a C++ class member.
bool isCXXClassMember() const {
  const DeclContext *DC = getDeclContext();

  // C++0x [class.mem]p1:
  //   The enumerators of an unscoped enumeration defined in
  //   the class are members of the class.
  if (isa<EnumDecl>(DC))
    DC = DC->getRedeclContext();

  return DC->isRecord();
}

/// Determine whether the given declaration is an instance member of
/// a C++ class.
bool isCXXInstanceMember() const;

/// Determine what kind of linkage this entity has.
///
/// This is not the linkage as defined by the standard or the codegen notion
/// of linkage. It is just an implementation detail that is used to compute
/// those.
Linkage getLinkageInternal() const;

/// Get the linkage from a semantic point of view. Entities in
/// anonymous namespaces are external (in c++98).
Linkage getFormalLinkage() const {
  return clang::getFormalLinkage(getLinkageInternal());
}

/// True if this decl has external linkage.
bool hasExternalFormalLinkage() const {
  return isExternalFormalLinkage(getLinkageInternal());
}

bool isExternallyVisible() const {
  return clang::isExternallyVisible(getLinkageInternal());
}

/// Determine whether this declaration can be redeclared in a
/// different translation unit.
bool isExternallyDeclarable() const {
  return isExternallyVisible() && !getOwningModuleForLinkage();
}

/// Determines the visibility of this entity.
Visibility getVisibility() const {
  return getLinkageAndVisibility().getVisibility();
}

/// Determines the linkage and visibility of this entity.
LinkageInfo getLinkageAndVisibility() const;

/// Kinds of explicit visibility.
enum ExplicitVisibilityKind {
  /// Do an LV computation for, ultimately, a type.
  /// Visibility may be restricted by type visibility settings and
  /// the visibility of template arguments.
  VisibilityForType,

  /// Do an LV computation for, ultimately, a non-type declaration.
  /// Visibility may be restricted by value visibility settings and
  /// the visibility of template arguments.
  VisibilityForValue
};

/// If visibility was explicitly specified for this
/// declaration, return that visibility.
Optional<Visibility>
getExplicitVisibility(ExplicitVisibilityKind kind) const;

/// True if the computed linkage is valid. Used for consistency
/// checking. Should always return true.
bool isLinkageValid() const;

/// True if something has required us to compute the linkage
/// of this declaration.
///
/// Language features which can retroactively change linkage (like a
/// typedef name for linkage purposes) may need to consider this,
/// but hopefully only in transitory ways during parsing.
bool hasLinkageBeenComputed() const {
  return hasCachedLinkage();
}

/// Looks through UsingDecls and ObjCCompatibleAliasDecls for
/// the underlying named decl.
NamedDecl *getUnderlyingDecl() {
  // Fast-path the common case.
  if (this->getKind() != UsingShadow &&
      this->getKind() != ConstructorUsingShadow &&
      this->getKind() != ObjCCompatibleAlias &&
      this->getKind() != NamespaceAlias)
    return this;

  return getUnderlyingDeclImpl();
}
const NamedDecl *getUnderlyingDecl() const {
  return const_cast<NamedDecl*>(this)->getUnderlyingDecl();
}

NamedDecl *getMostRecentDecl() {
  return cast<NamedDecl>(static_cast<Decl *>(this)->getMostRecentDecl());
}
const NamedDecl *getMostRecentDecl() const {
  return const_cast<NamedDecl*>(this)->getMostRecentDecl();
}

ObjCStringFormatFamily getObjCFStringFormattingFamily() const;

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstNamed && K <= lastNamed; }
454};

456inline raw_ostream &operator<<(raw_ostream &OS, const NamedDecl &ND) {
ND.printName(OS);
return OS;
459}

461/// Represents the declaration of a label.  Labels also have a
462/// corresponding LabelStmt, which indicates the position that the label was
463/// defined at.  For normal labels, the location of the decl is the same as the
464/// location of the statement.  For GNU local labels (__label__), the decl
465/// location is where the __label__ is.
466class LabelDecl : public NamedDecl {
LabelStmt *TheStmt;
StringRef MSAsmName;
bool MSAsmNameResolved = false;

/// For normal labels, this is the same as the main declaration
/// label, i.e., the location of the identifier; for GNU local labels,
/// this is the location of the __label__ keyword.
SourceLocation LocStart;

LabelDecl(DeclContext *DC, SourceLocation IdentL, IdentifierInfo *II,
          LabelStmt *S, SourceLocation StartL)
    : NamedDecl(Label, DC, IdentL, II), TheStmt(S), LocStart(StartL) {}

void anchor() override;

482public:
static LabelDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation IdentL, IdentifierInfo *II);
static LabelDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation IdentL, IdentifierInfo *II,
                         SourceLocation GnuLabelL);
static LabelDecl *CreateDeserialized(ASTContext &C, unsigned ID);

LabelStmt *getStmt() const { return TheStmt; }
void setStmt(LabelStmt *T) { TheStmt = T; }

bool isGnuLocal() const { return LocStart != getLocation(); }
void setLocStart(SourceLocation L) { LocStart = L; }

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(LocStart, getLocation());
}

bool isMSAsmLabel() const { return !MSAsmName.empty(); }
bool isResolvedMSAsmLabel() const { return isMSAsmLabel() && MSAsmNameResolved; }
void setMSAsmLabel(StringRef Name);
StringRef getMSAsmLabel() const { return MSAsmName; }
void setMSAsmLabelResolved() { MSAsmNameResolved = true; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Label; }
509};

511/// Represent a C++ namespace.
512class NamespaceDecl : public NamedDecl, public DeclContext,
                    public Redeclarable<NamespaceDecl>
514{
/// The starting location of the source range, pointing
/// to either the namespace or the inline keyword.
SourceLocation LocStart;

/// The ending location of the source range.
SourceLocation RBraceLoc;

/// A pointer to either the anonymous namespace that lives just inside
/// this namespace or to the first namespace in the chain (the latter case
/// only when this is not the first in the chain), along with a
/// boolean value indicating whether this is an inline namespace.
llvm::PointerIntPair<NamespaceDecl *, 1, bool> AnonOrFirstNamespaceAndInline;

NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline,
              SourceLocation StartLoc, SourceLocation IdLoc,
              IdentifierInfo *Id, NamespaceDecl *PrevDecl);

using redeclarable_base = Redeclarable<NamespaceDecl>;

NamespaceDecl *getNextRedeclarationImpl() override;
NamespaceDecl *getPreviousDeclImpl() override;
NamespaceDecl *getMostRecentDeclImpl() override;

538public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static NamespaceDecl *Create(ASTContext &C, DeclContext *DC,
                             bool Inline, SourceLocation StartLoc,
                             SourceLocation IdLoc, IdentifierInfo *Id,
                             NamespaceDecl *PrevDecl);

static NamespaceDecl *CreateDeserialized(ASTContext &C, unsigned ID);

using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

/// Returns true if this is an anonymous namespace declaration.
///
/// For example:
/// \code
///   namespace {
///     ...
///   };
/// \endcode
/// q.v. C++ [namespace.unnamed]
bool isAnonymousNamespace() const {
  return !getIdentifier();
}

/// Returns true if this is an inline namespace declaration.
bool isInline() const {
  return AnonOrFirstNamespaceAndInline.getInt();
}

/// Set whether this is an inline namespace declaration.
void setInline(bool Inline) {
  AnonOrFirstNamespaceAndInline.setInt(Inline);
}

/// Get the original (first) namespace declaration.
NamespaceDecl *getOriginalNamespace();

/// Get the original (first) namespace declaration.
const NamespaceDecl *getOriginalNamespace() const;

/// Return true if this declaration is an original (first) declaration
/// of the namespace. This is false for non-original (subsequent) namespace
/// declarations and anonymous namespaces.
bool isOriginalNamespace() const;

/// Retrieve the anonymous namespace nested inside this namespace,
/// if any.
NamespaceDecl *getAnonymousNamespace() const {
  return getOriginalNamespace()->AnonOrFirstNamespaceAndInline.getPointer();
}

void setAnonymousNamespace(NamespaceDecl *D) {
  getOriginalNamespace()->AnonOrFirstNamespaceAndInline.setPointer(D);
}

/// Retrieves the canonical declaration of this namespace.
NamespaceDecl *getCanonicalDecl() override {
  return getOriginalNamespace();
}
const NamespaceDecl *getCanonicalDecl() const {
  return getOriginalNamespace();
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(LocStart, RBraceLoc);
}

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; }
SourceLocation getRBraceLoc() const { return RBraceLoc; }
void setLocStart(SourceLocation L) { LocStart = L; }
void setRBraceLoc(SourceLocation L) { RBraceLoc = L; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Namespace; }
static DeclContext *castToDeclContext(const NamespaceDecl *D) {
  return static_cast<DeclContext *>(const_cast<NamespaceDecl*>(D));
}
static NamespaceDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<NamespaceDecl *>(const_cast<DeclContext*>(DC));
}
629};

631/// Represent the declaration of a variable (in which case it is
632/// an lvalue) a function (in which case it is a function designator) or
633/// an enum constant.
634class ValueDecl : public NamedDecl {
QualType DeclType;

void anchor() override;

639protected:
ValueDecl(Kind DK, DeclContext *DC, SourceLocation L,
          DeclarationName N, QualType T)
  : NamedDecl(DK, DC, L, N), DeclType(T) {}

644public:
QualType getType() const { return DeclType; }
void setType(QualType newType) { DeclType = newType; }

/// Determine whether this symbol is weakly-imported,
///        or declared with the weak or weak-ref attr.
bool isWeak() const;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstValue && K <= lastValue; }
655};

657/// A struct with extended info about a syntactic
658/// name qualifier, to be used for the case of out-of-line declarations.
659struct QualifierInfo {
NestedNameSpecifierLoc QualifierLoc;

/// The number of "outer" template parameter lists.
/// The count includes all of the template parameter lists that were matched
/// against the template-ids occurring into the NNS and possibly (in the
/// case of an explicit specialization) a final "template <>".
unsigned NumTemplParamLists = 0;

/// A new-allocated array of size NumTemplParamLists,
/// containing pointers to the "outer" template parameter lists.
/// It includes all of the template parameter lists that were matched
/// against the template-ids occurring into the NNS and possibly (in the
/// case of an explicit specialization) a final "template <>".
TemplateParameterList** TemplParamLists = nullptr;

QualifierInfo() = default;
QualifierInfo(const QualifierInfo &) = delete;
QualifierInfo& operator=(const QualifierInfo &) = delete;

/// Sets info about "outer" template parameter lists.
void setTemplateParameterListsInfo(ASTContext &Context,
                                   ArrayRef<TemplateParameterList *> TPLists);
682};

684/// Represents a ValueDecl that came out of a declarator.
685/// Contains type source information through TypeSourceInfo.
686class DeclaratorDecl : public ValueDecl {
// A struct representing a TInfo, a trailing requires-clause and a syntactic
// qualifier, to be used for the (uncommon) case of out-of-line declarations
// and constrained function decls.
struct ExtInfo : public QualifierInfo {
  TypeSourceInfo *TInfo;
  Expr *TrailingRequiresClause = nullptr;
};

llvm::PointerUnion<TypeSourceInfo *, ExtInfo *> DeclInfo;

/// The start of the source range for this declaration,
/// ignoring outer template declarations.
SourceLocation InnerLocStart;

bool hasExtInfo() const { return DeclInfo.is<ExtInfo*>(); }
ExtInfo *getExtInfo() { return DeclInfo.get<ExtInfo*>(); }
const ExtInfo *getExtInfo() const { return DeclInfo.get<ExtInfo*>(); }

705protected:
DeclaratorDecl(Kind DK, DeclContext *DC, SourceLocation L,
               DeclarationName N, QualType T, TypeSourceInfo *TInfo,
               SourceLocation StartL)
    : ValueDecl(DK, DC, L, N, T), DeclInfo(TInfo), InnerLocStart(StartL) {}

711public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

TypeSourceInfo *getTypeSourceInfo() const {
  return hasExtInfo()
    ? getExtInfo()->TInfo
    : DeclInfo.get<TypeSourceInfo*>();
}

void setTypeSourceInfo(TypeSourceInfo *TI) {
  if (hasExtInfo())
    getExtInfo()->TInfo = TI;
  else
    DeclInfo = TI;
}

/// Return start of source range ignoring outer template declarations.
SourceLocation getInnerLocStart() const { return InnerLocStart; }
void setInnerLocStart(SourceLocation L) { InnerLocStart = L; }

/// Return start of source range taking into account any outer template
/// declarations.
SourceLocation getOuterLocStart() const;

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) {
  return getOuterLocStart();
}

/// Retrieve the nested-name-specifier that qualifies the name of this
/// declaration, if it was present in the source.
NestedNameSpecifier *getQualifier() const {
  return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier()
                      : nullptr;
}

/// Retrieve the nested-name-specifier (with source-location
/// information) that qualifies the name of this declaration, if it was
/// present in the source.
NestedNameSpecifierLoc getQualifierLoc() const {
  return hasExtInfo() ? getExtInfo()->QualifierLoc
                      : NestedNameSpecifierLoc();
}

void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc);

/// \brief Get the constraint-expression introduced by the trailing
/// requires-clause in the function/member declaration, or null if no
/// requires-clause was provided.
Expr *getTrailingRequiresClause() {
  return hasExtInfo() ? getExtInfo()->TrailingRequiresClause
                      : nullptr;
}

const Expr *getTrailingRequiresClause() const {
  return hasExtInfo() ? getExtInfo()->TrailingRequiresClause
                      : nullptr;
}

void setTrailingRequiresClause(Expr *TrailingRequiresClause);

unsigned getNumTemplateParameterLists() const {
  return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0;
}

TemplateParameterList *getTemplateParameterList(unsigned index) const {
  assert(index < getNumTemplateParameterLists())((index < getNumTemplateParameterLists()) ? static_cast<
void> (0) : __assert_fail ("index < getNumTemplateParameterLists()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 779, __PRETTY_FUNCTION__));
  return getExtInfo()->TemplParamLists[index];
}

void setTemplateParameterListsInfo(ASTContext &Context,
                                   ArrayRef<TemplateParameterList *> TPLists);

SourceLocation getTypeSpecStartLoc() const;
SourceLocation getTypeSpecEndLoc() const;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstDeclarator && K <= lastDeclarator;
}
794};

796/// Structure used to store a statement, the constant value to
797/// which it was evaluated (if any), and whether or not the statement
798/// is an integral constant expression (if known).
799struct EvaluatedStmt {
/// Whether this statement was already evaluated.
bool WasEvaluated : 1;

/// Whether this statement is being evaluated.
bool IsEvaluating : 1;

/// Whether we already checked whether this statement was an
/// integral constant expression.
bool CheckedICE : 1;

/// Whether we are checking whether this statement is an
/// integral constant expression.
bool CheckingICE : 1;

/// Whether this statement is an integral constant expression,
/// or in C++11, whether the statement is a constant expression. Only
/// valid if CheckedICE is true.
bool IsICE : 1;

/// Whether this variable is known to have constant destruction. That is,
/// whether running the destructor on the initial value is a side-effect
/// (and doesn't inspect any state that might have changed during program
/// execution). This is currently only computed if the destructor is
/// non-trivial.
bool HasConstantDestruction : 1;

Stmt *Value;
APValue Evaluated;

EvaluatedStmt()
    : WasEvaluated(false), IsEvaluating(false), CheckedICE(false),
      CheckingICE(false), IsICE(false), HasConstantDestruction(false) {}
832};

834/// Represents a variable declaration or definition.
835class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> {
836public:
/// Initialization styles.
enum InitializationStyle {
  /// C-style initialization with assignment
  CInit,

  /// Call-style initialization (C++98)
  CallInit,

  /// Direct list-initialization (C++11)
  ListInit
};

/// Kinds of thread-local storage.
enum TLSKind {
  /// Not a TLS variable.
  TLS_None,

  /// TLS with a known-constant initializer.
  TLS_Static,

  /// TLS with a dynamic initializer.
  TLS_Dynamic
};

/// Return the string used to specify the storage class \p SC.
///
/// It is illegal to call this function with SC == None.
static const char *getStorageClassSpecifierString(StorageClass SC);

866protected:
// A pointer union of Stmt * and EvaluatedStmt *. When an EvaluatedStmt, we
// have allocated the auxiliary struct of information there.
//
// TODO: It is a bit unfortunate to use a PointerUnion inside the VarDecl for
// this as *many* VarDecls are ParmVarDecls that don't have default
// arguments. We could save some space by moving this pointer union to be
// allocated in trailing space when necessary.
using InitType = llvm::PointerUnion<Stmt *, EvaluatedStmt *>;

/// The initializer for this variable or, for a ParmVarDecl, the
/// C++ default argument.
mutable InitType Init;

880private:
friend class ASTDeclReader;
friend class ASTNodeImporter;
friend class StmtIteratorBase;

class VarDeclBitfields {
  friend class ASTDeclReader;
  friend class VarDecl;

  unsigned SClass : 3;
  unsigned TSCSpec : 2;
  unsigned InitStyle : 2;

  /// Whether this variable is an ARC pseudo-__strong variable; see
  /// isARCPseudoStrong() for details.
  unsigned ARCPseudoStrong : 1;
};
enum { NumVarDeclBits = 8 };

899protected:
enum { NumParameterIndexBits = 8 };

enum DefaultArgKind {
  DAK_None,
  DAK_Unparsed,
  DAK_Uninstantiated,
  DAK_Normal
};

enum { NumScopeDepthOrObjCQualsBits = 7 };

class ParmVarDeclBitfields {
  friend class ASTDeclReader;
  friend class ParmVarDecl;

  unsigned : NumVarDeclBits;

  /// Whether this parameter inherits a default argument from a
  /// prior declaration.
  unsigned HasInheritedDefaultArg : 1;

  /// Describes the kind of default argument for this parameter. By default
  /// this is none. If this is normal, then the default argument is stored in
  /// the \c VarDecl initializer expression unless we were unable to parse
  /// (even an invalid) expression for the default argument.
  unsigned DefaultArgKind : 2;

  /// Whether this parameter undergoes K&R argument promotion.
  unsigned IsKNRPromoted : 1;

  /// Whether this parameter is an ObjC method parameter or not.
  unsigned IsObjCMethodParam : 1;

  /// If IsObjCMethodParam, a Decl::ObjCDeclQualifier.
  /// Otherwise, the number of function parameter scopes enclosing
  /// the function parameter scope in which this parameter was
  /// declared.
  unsigned ScopeDepthOrObjCQuals : NumScopeDepthOrObjCQualsBits;

  /// The number of parameters preceding this parameter in the
  /// function parameter scope in which it was declared.
  unsigned ParameterIndex : NumParameterIndexBits;
};

class NonParmVarDeclBitfields {
  friend class ASTDeclReader;
  friend class ImplicitParamDecl;
  friend class VarDecl;

  unsigned : NumVarDeclBits;

  // FIXME: We need something similar to CXXRecordDecl::DefinitionData.
  /// Whether this variable is a definition which was demoted due to
  /// module merge.
  unsigned IsThisDeclarationADemotedDefinition : 1;

  /// Whether this variable is the exception variable in a C++ catch
  /// or an Objective-C @catch statement.
  unsigned ExceptionVar : 1;

  /// Whether this local variable could be allocated in the return
  /// slot of its function, enabling the named return value optimization
  /// (NRVO).
  unsigned NRVOVariable : 1;

  /// Whether this variable is the for-range-declaration in a C++0x
  /// for-range statement.
  unsigned CXXForRangeDecl : 1;

  /// Whether this variable is the for-in loop declaration in Objective-C.
  unsigned ObjCForDecl : 1;

  /// Whether this variable is (C++1z) inline.
  unsigned IsInline : 1;

  /// Whether this variable has (C++1z) inline explicitly specified.
  unsigned IsInlineSpecified : 1;

  /// Whether this variable is (C++0x) constexpr.
  unsigned IsConstexpr : 1;

  /// Whether this variable is the implicit variable for a lambda
  /// init-capture.
  unsigned IsInitCapture : 1;

  /// Whether this local extern variable's previous declaration was
  /// declared in the same block scope. This controls whether we should merge
  /// the type of this declaration with its previous declaration.
  unsigned PreviousDeclInSameBlockScope : 1;

  /// Defines kind of the ImplicitParamDecl: 'this', 'self', 'vtt', '_cmd' or
  /// something else.
  unsigned ImplicitParamKind : 3;

  unsigned EscapingByref : 1;
};

union {
  unsigned AllBits;
  VarDeclBitfields VarDeclBits;
  ParmVarDeclBitfields ParmVarDeclBits;
  NonParmVarDeclBitfields NonParmVarDeclBits;
};

VarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
        SourceLocation IdLoc, IdentifierInfo *Id, QualType T,
        TypeSourceInfo *TInfo, StorageClass SC);

using redeclarable_base = Redeclarable<VarDecl>;

VarDecl *getNextRedeclarationImpl() override {
  return getNextRedeclaration();
}

VarDecl *getPreviousDeclImpl() override {
  return getPreviousDecl();
}

VarDecl *getMostRecentDeclImpl() override {
  return getMostRecentDecl();
}

1022public:
using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

static VarDecl *Create(ASTContext &C, DeclContext *DC,
                       SourceLocation StartLoc, SourceLocation IdLoc,
                       IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
                       StorageClass S);

static VarDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

/// Returns the storage class as written in the source. For the
/// computed linkage of symbol, see getLinkage.
StorageClass getStorageClass() const {
  return (StorageClass) VarDeclBits.SClass;
}
void setStorageClass(StorageClass SC);

void setTSCSpec(ThreadStorageClassSpecifier TSC) {
  VarDeclBits.TSCSpec = TSC;
  assert(VarDeclBits.TSCSpec == TSC && "truncation")((VarDeclBits.TSCSpec == TSC && "truncation") ? static_cast
<void> (0) : __assert_fail ("VarDeclBits.TSCSpec == TSC && \"truncation\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1051, __PRETTY_FUNCTION__));
}
ThreadStorageClassSpecifier getTSCSpec() const {
  return static_cast<ThreadStorageClassSpecifier>(VarDeclBits.TSCSpec);
}
TLSKind getTLSKind() const;

/// Returns true if a variable with function scope is a non-static local
/// variable.
bool hasLocalStorage() const {
  if (getStorageClass() == SC_None) {
8
←
Assuming the condition is false→
9
←
Taking false branch→
    // OpenCL v1.2 s6.5.3: The __constant or constant address space name is
    // used to describe variables allocated in global memory and which are
    // accessed inside a kernel(s) as read-only variables. As such, variables
    // in constant address space cannot have local storage.
    if (getType().getAddressSpace() == LangAS::opencl_constant)
      return false;
    // Second check is for C++11 [dcl.stc]p4.
    return !isFileVarDecl() && getTSCSpec() == TSCS_unspecified;
  }

  // Global Named Register (GNU extension)
  if (getStorageClass() == SC_Register && !isLocalVarDeclOrParm())
10
←
Assuming the condition is false→
    return false;

  // Return true for:  Auto, Register.
  // Return false for: Extern, Static, PrivateExtern, OpenCLWorkGroupLocal.

  return getStorageClass() >= SC_Auto;
11
←
Assuming the condition is true→
12
←
Returning the value 1, which participates in a condition later→
}

/// Returns true if a variable with function scope is a static local
/// variable.
bool isStaticLocal() const {
  return (getStorageClass() == SC_Static ||
          // C++11 [dcl.stc]p4
          (getStorageClass() == SC_None && getTSCSpec() == TSCS_thread_local))
    && !isFileVarDecl();
}

/// Returns true if a variable has extern or __private_extern__
/// storage.
bool hasExternalStorage() const {
  return getStorageClass() == SC_Extern ||
         getStorageClass() == SC_PrivateExtern;
}

/// Returns true for all variables that do not have local storage.
///
/// This includes all global variables as well as static variables declared
/// within a function.
bool hasGlobalStorage() const { return !hasLocalStorage(); }

/// Get the storage duration of this variable, per C++ [basic.stc].
StorageDuration getStorageDuration() const {
  return hasLocalStorage() ? SD_Automatic :
         getTSCSpec() ? SD_Thread : SD_Static;
}

/// Compute the language linkage.
LanguageLinkage getLanguageLinkage() const;

/// Determines whether this variable is a variable with external, C linkage.
bool isExternC() const;

/// Determines whether this variable's context is, or is nested within,
/// a C++ extern "C" linkage spec.
bool isInExternCContext() const;

/// Determines whether this variable's context is, or is nested within,
/// a C++ extern "C++" linkage spec.
bool isInExternCXXContext() const;

/// Returns true for local variable declarations other than parameters.
/// Note that this includes static variables inside of functions. It also
/// includes variables inside blocks.
///
///   void foo() { int x; static int y; extern int z; }
bool isLocalVarDecl() const {
  if (getKind() != Decl::Var && getKind() != Decl::Decomposition)
    return false;
  if (const DeclContext *DC = getLexicalDeclContext())
    return DC->getRedeclContext()->isFunctionOrMethod();
  return false;
}

/// Similar to isLocalVarDecl but also includes parameters.
bool isLocalVarDeclOrParm() const {
  return isLocalVarDecl() || getKind() == Decl::ParmVar;
}

/// Similar to isLocalVarDecl, but excludes variables declared in blocks.
bool isFunctionOrMethodVarDecl() const {
  if (getKind() != Decl::Var && getKind() != Decl::Decomposition)
    return false;
  const DeclContext *DC = getLexicalDeclContext()->getRedeclContext();
  return DC->isFunctionOrMethod() && DC->getDeclKind() != Decl::Block;
}

/// Determines whether this is a static data member.
///
/// This will only be true in C++, and applies to, e.g., the
/// variable 'x' in:
/// \code
/// struct S {
///   static int x;
/// };
/// \endcode
bool isStaticDataMember() const {
  // If it wasn't static, it would be a FieldDecl.
  return getKind() != Decl::ParmVar && getDeclContext()->isRecord();
}

VarDecl *getCanonicalDecl() override;
const VarDecl *getCanonicalDecl() const {
  return const_cast<VarDecl*>(this)->getCanonicalDecl();
}

enum DefinitionKind {
  /// This declaration is only a declaration.
  DeclarationOnly,

  /// This declaration is a tentative definition.
  TentativeDefinition,

  /// This declaration is definitely a definition.
  Definition
};

/// Check whether this declaration is a definition. If this could be
/// a tentative definition (in C), don't check whether there's an overriding
/// definition.
DefinitionKind isThisDeclarationADefinition(ASTContext &) const;
DefinitionKind isThisDeclarationADefinition() const {
  return isThisDeclarationADefinition(getASTContext());
}

/// Check whether this variable is defined in this translation unit.
DefinitionKind hasDefinition(ASTContext &) const;
DefinitionKind hasDefinition() const {
  return hasDefinition(getASTContext());
}

/// Get the tentative definition that acts as the real definition in a TU.
/// Returns null if there is a proper definition available.
VarDecl *getActingDefinition();
const VarDecl *getActingDefinition() const {
  return const_cast<VarDecl*>(this)->getActingDefinition();
}

/// Get the real (not just tentative) definition for this declaration.
VarDecl *getDefinition(ASTContext &);
const VarDecl *getDefinition(ASTContext &C) const {
  return const_cast<VarDecl*>(this)->getDefinition(C);
}
VarDecl *getDefinition() {
  return getDefinition(getASTContext());
}
const VarDecl *getDefinition() const {
  return const_cast<VarDecl*>(this)->getDefinition();
}

/// Determine whether this is or was instantiated from an out-of-line
/// definition of a static data member.
bool isOutOfLine() const override;

/// Returns true for file scoped variable declaration.
bool isFileVarDecl() const {
  Kind K = getKind();
  if (K == ParmVar || K == ImplicitParam)
    return false;

  if (getLexicalDeclContext()->getRedeclContext()->isFileContext())
    return true;

  if (isStaticDataMember())
    return true;

  return false;
}

/// Get the initializer for this variable, no matter which
/// declaration it is attached to.
const Expr *getAnyInitializer() const {
  const VarDecl *D;
  return getAnyInitializer(D);
}

/// Get the initializer for this variable, no matter which
/// declaration it is attached to. Also get that declaration.
const Expr *getAnyInitializer(const VarDecl *&D) const;

bool hasInit() const;
const Expr *getInit() const {
  return const_cast<VarDecl *>(this)->getInit();
}
Expr *getInit();

/// Retrieve the address of the initializer expression.
Stmt **getInitAddress();

void setInit(Expr *I);

/// Get the initializing declaration of this variable, if any. This is
/// usually the definition, except that for a static data member it can be
/// the in-class declaration.
VarDecl *getInitializingDeclaration();
const VarDecl *getInitializingDeclaration() const {
  return const_cast<VarDecl *>(this)->getInitializingDeclaration();
}

/// Determine whether this variable's value might be usable in a
/// constant expression, according to the relevant language standard.
/// This only checks properties of the declaration, and does not check
/// whether the initializer is in fact a constant expression.
bool mightBeUsableInConstantExpressions(ASTContext &C) const;

/// Determine whether this variable's value can be used in a
/// constant expression, according to the relevant language standard,
/// including checking whether it was initialized by a constant expression.
bool isUsableInConstantExpressions(ASTContext &C) const;

EvaluatedStmt *ensureEvaluatedStmt() const;

/// Attempt to evaluate the value of the initializer attached to this
/// declaration, and produce notes explaining why it cannot be evaluated or is
/// not a constant expression. Returns a pointer to the value if evaluation
/// succeeded, 0 otherwise.
APValue *evaluateValue() const;
APValue *evaluateValue(SmallVectorImpl<PartialDiagnosticAt> &Notes) const;

/// Return the already-evaluated value of this variable's
/// initializer, or NULL if the value is not yet known. Returns pointer
/// to untyped APValue if the value could not be evaluated.
APValue *getEvaluatedValue() const;

/// Evaluate the destruction of this variable to determine if it constitutes
/// constant destruction.
///
/// \pre isInitICE()
/// \return \c true if this variable has constant destruction, \c false if
///         not.
bool evaluateDestruction(SmallVectorImpl<PartialDiagnosticAt> &Notes) const;

/// Determines whether it is already known whether the
/// initializer is an integral constant expression or not.
bool isInitKnownICE() const;

/// Determines whether the initializer is an integral constant
/// expression, or in C++11, whether the initializer is a constant
/// expression.
///
/// \pre isInitKnownICE()
bool isInitICE() const;

/// Determine whether the value of the initializer attached to this
/// declaration is an integral constant expression.
bool checkInitIsICE() const;

void setInitStyle(InitializationStyle Style) {
  VarDeclBits.InitStyle = Style;
}

/// The style of initialization for this declaration.
///
/// C-style initialization is "int x = 1;". Call-style initialization is
/// a C++98 direct-initializer, e.g. "int x(1);". The Init expression will be
/// the expression inside the parens or a "ClassType(a,b,c)" class constructor
/// expression for class types. List-style initialization is C++11 syntax,
/// e.g. "int x{1};". Clients can distinguish between different forms of
/// initialization by checking this value. In particular, "int x = {1};" is
/// C-style, "int x({1})" is call-style, and "int x{1};" is list-style; the
/// Init expression in all three cases is an InitListExpr.
InitializationStyle getInitStyle() const {
  return static_cast<InitializationStyle>(VarDeclBits.InitStyle);
}

/// Whether the initializer is a direct-initializer (list or call).
bool isDirectInit() const {
  return getInitStyle() != CInit;
}

/// If this definition should pretend to be a declaration.
bool isThisDeclarationADemotedDefinition() const {
  return isa<ParmVarDecl>(this) ? false :
    NonParmVarDeclBits.IsThisDeclarationADemotedDefinition;
}

/// This is a definition which should be demoted to a declaration.
///
/// In some cases (mostly module merging) we can end up with two visible
/// definitions one of which needs to be demoted to a declaration to keep
/// the AST invariants.
void demoteThisDefinitionToDeclaration() {
  assert(isThisDeclarationADefinition() && "Not a definition!")((isThisDeclarationADefinition() && "Not a definition!"
) ? static_cast<void> (0) : __assert_fail ("isThisDeclarationADefinition() && \"Not a definition!\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1345, __PRETTY_FUNCTION__));
  assert(!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!")((!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!"
) ? static_cast<void> (0) : __assert_fail ("!isa<ParmVarDecl>(this) && \"Cannot demote ParmVarDecls!\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1346, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = 1;
}

/// Determine whether this variable is the exception variable in a
/// C++ catch statememt or an Objective-C \@catch statement.
bool isExceptionVariable() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ExceptionVar;
}
void setExceptionVariable(bool EV) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1356, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.ExceptionVar = EV;
}

/// Determine whether this local variable can be used with the named
/// return value optimization (NRVO).
///
/// The named return value optimization (NRVO) works by marking certain
/// non-volatile local variables of class type as NRVO objects. These
/// locals can be allocated within the return slot of their containing
/// function, in which case there is no need to copy the object to the
/// return slot when returning from the function. Within the function body,
/// each return that returns the NRVO object will have this variable as its
/// NRVO candidate.
bool isNRVOVariable() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.NRVOVariable;
}
void setNRVOVariable(bool NRVO) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1374, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.NRVOVariable = NRVO;
}

/// Determine whether this variable is the for-range-declaration in
/// a C++0x for-range statement.
bool isCXXForRangeDecl() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.CXXForRangeDecl;
}
void setCXXForRangeDecl(bool FRD) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1384, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.CXXForRangeDecl = FRD;
}

/// Determine whether this variable is a for-loop declaration for a
/// for-in statement in Objective-C.
bool isObjCForDecl() const {
  return NonParmVarDeclBits.ObjCForDecl;
}

void setObjCForDecl(bool FRD) {
  NonParmVarDeclBits.ObjCForDecl = FRD;
}

/// Determine whether this variable is an ARC pseudo-__strong variable. A
/// pseudo-__strong variable has a __strong-qualified type but does not
/// actually retain the object written into it. Generally such variables are
/// also 'const' for safety. There are 3 cases where this will be set, 1) if
/// the variable is annotated with the objc_externally_retained attribute, 2)
/// if its 'self' in a non-init method, or 3) if its the variable in an for-in
/// loop.
bool isARCPseudoStrong() const { return VarDeclBits.ARCPseudoStrong; }
void setARCPseudoStrong(bool PS) { VarDeclBits.ARCPseudoStrong = PS; }

/// Whether this variable is (C++1z) inline.
bool isInline() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInline;
}
bool isInlineSpecified() const {
  return isa<ParmVarDecl>(this) ? false
                                : NonParmVarDeclBits.IsInlineSpecified;
}
void setInlineSpecified() {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1417, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInline = true;
  NonParmVarDeclBits.IsInlineSpecified = true;
}
void setImplicitlyInline() {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1422, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInline = true;
}

/// Whether this variable is (C++11) constexpr.
bool isConstexpr() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsConstexpr;
}
void setConstexpr(bool IC) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1431, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsConstexpr = IC;
}

/// Whether this variable is the implicit variable for a lambda init-capture.
bool isInitCapture() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInitCapture;
}
void setInitCapture(bool IC) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1440, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInitCapture = IC;
}

/// Determine whether this variable is actually a function parameter pack or
/// init-capture pack.
bool isParameterPack() const;

/// Whether this local extern variable declaration's previous declaration
/// was declared in the same block scope. Only correct in C++.
bool isPreviousDeclInSameBlockScope() const {
  return isa<ParmVarDecl>(this)
             ? false
             : NonParmVarDeclBits.PreviousDeclInSameBlockScope;
}
void setPreviousDeclInSameBlockScope(bool Same) {
  assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0
) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1456, __PRETTY_FUNCTION__));
  NonParmVarDeclBits.PreviousDeclInSameBlockScope = Same;
}

/// Indicates the capture is a __block variable that is captured by a block
/// that can potentially escape (a block for which BlockDecl::doesNotEscape
/// returns false).
bool isEscapingByref() const;

/// Indicates the capture is a __block variable that is never captured by an
/// escaping block.
bool isNonEscapingByref() const;

void setEscapingByref() {
  NonParmVarDeclBits.EscapingByref = true;
}

/// Retrieve the variable declaration from which this variable could
/// be instantiated, if it is an instantiation (rather than a non-template).
VarDecl *getTemplateInstantiationPattern() const;

/// If this variable is an instantiated static data member of a
/// class template specialization, returns the templated static data member
/// from which it was instantiated.
VarDecl *getInstantiatedFromStaticDataMember() const;

/// If this variable is an instantiation of a variable template or a
/// static data member of a class template, determine what kind of
/// template specialization or instantiation this is.
TemplateSpecializationKind getTemplateSpecializationKind() const;

/// Get the template specialization kind of this variable for the purposes of
/// template instantiation. This differs from getTemplateSpecializationKind()
/// for an instantiation of a class-scope explicit specialization.
TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const;

/// If this variable is an instantiation of a variable template or a
/// static data member of a class template, determine its point of
/// instantiation.
SourceLocation getPointOfInstantiation() const;

/// If this variable is an instantiation of a static data member of a
/// class template specialization, retrieves the member specialization
/// information.
MemberSpecializationInfo *getMemberSpecializationInfo() const;

/// For a static data member that was instantiated from a static
/// data member of a class template, set the template specialiation kind.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                      SourceLocation PointOfInstantiation = SourceLocation());

/// Specify that this variable is an instantiation of the
/// static data member VD.
void setInstantiationOfStaticDataMember(VarDecl *VD,
                                        TemplateSpecializationKind TSK);

/// Retrieves the variable template that is described by this
/// variable declaration.
///
/// Every variable template is represented as a VarTemplateDecl and a
/// VarDecl. The former contains template properties (such as
/// the template parameter lists) while the latter contains the
/// actual description of the template's
/// contents. VarTemplateDecl::getTemplatedDecl() retrieves the
/// VarDecl that from a VarTemplateDecl, while
/// getDescribedVarTemplate() retrieves the VarTemplateDecl from
/// a VarDecl.
VarTemplateDecl *getDescribedVarTemplate() const;

void setDescribedVarTemplate(VarTemplateDecl *Template);

// Is this variable known to have a definition somewhere in the complete
// program? This may be true even if the declaration has internal linkage and
// has no definition within this source file.
bool isKnownToBeDefined() const;

/// Is destruction of this variable entirely suppressed? If so, the variable
/// need not have a usable destructor at all.
bool isNoDestroy(const ASTContext &) const;

/// Would the destruction of this variable have any effect, and if so, what
/// kind?
QualType::DestructionKind needsDestruction(const ASTContext &Ctx) const;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstVar && K <= lastVar; }
1544};

1546class ImplicitParamDecl : public VarDecl {
void anchor() override;

1549public:
/// Defines the kind of the implicit parameter: is this an implicit parameter
/// with pointer to 'this', 'self', '_cmd', virtual table pointers, captured
/// context or something else.
enum ImplicitParamKind : unsigned {
  /// Parameter for Objective-C 'self' argument
  ObjCSelf,

  /// Parameter for Objective-C '_cmd' argument
  ObjCCmd,

  /// Parameter for C++ 'this' argument
  CXXThis,

  /// Parameter for C++ virtual table pointers
  CXXVTT,

  /// Parameter for captured context
  CapturedContext,

  /// Other implicit parameter
  Other,
};

/// Create implicit parameter.
static ImplicitParamDecl *Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation IdLoc, IdentifierInfo *Id,
                                 QualType T, ImplicitParamKind ParamKind);
static ImplicitParamDecl *Create(ASTContext &C, QualType T,
                                 ImplicitParamKind ParamKind);

static ImplicitParamDecl *CreateDeserialized(ASTContext &C, unsigned ID);

ImplicitParamDecl(ASTContext &C, DeclContext *DC, SourceLocation IdLoc,
                  IdentifierInfo *Id, QualType Type,
                  ImplicitParamKind ParamKind)
    : VarDecl(ImplicitParam, C, DC, IdLoc, IdLoc, Id, Type,
              /*TInfo=*/nullptr, SC_None) {
  NonParmVarDeclBits.ImplicitParamKind = ParamKind;
  setImplicit();
}

ImplicitParamDecl(ASTContext &C, QualType Type, ImplicitParamKind ParamKind)
    : VarDecl(ImplicitParam, C, /*DC=*/nullptr, SourceLocation(),
              SourceLocation(), /*Id=*/nullptr, Type,
              /*TInfo=*/nullptr, SC_None) {
  NonParmVarDeclBits.ImplicitParamKind = ParamKind;
  setImplicit();
}

/// Returns the implicit parameter kind.
ImplicitParamKind getParameterKind() const {
  return static_cast<ImplicitParamKind>(NonParmVarDeclBits.ImplicitParamKind);
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ImplicitParam; }
1607};

1609/// Represents a parameter to a function.
1610class ParmVarDecl : public VarDecl {
1611public:
enum { MaxFunctionScopeDepth = 255 };
enum { MaxFunctionScopeIndex = 255 };

1615protected:
ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
            SourceLocation IdLoc, IdentifierInfo *Id, QualType T,
            TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
    : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) {
  assert(ParmVarDeclBits.HasInheritedDefaultArg == false)((ParmVarDeclBits.HasInheritedDefaultArg == false) ? static_cast
<void> (0) : __assert_fail ("ParmVarDeclBits.HasInheritedDefaultArg == false"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1620, __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.DefaultArgKind == DAK_None)((ParmVarDeclBits.DefaultArgKind == DAK_None) ? static_cast<
void> (0) : __assert_fail ("ParmVarDeclBits.DefaultArgKind == DAK_None"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1621, __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.IsKNRPromoted == false)((ParmVarDeclBits.IsKNRPromoted == false) ? static_cast<void
> (0) : __assert_fail ("ParmVarDeclBits.IsKNRPromoted == false"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1622, __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.IsObjCMethodParam == false)((ParmVarDeclBits.IsObjCMethodParam == false) ? static_cast<
void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam == false"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1623, __PRETTY_FUNCTION__));
  setDefaultArg(DefArg);
}

1627public:
static ParmVarDecl *Create(ASTContext &C, DeclContext *DC,
                           SourceLocation StartLoc,
                           SourceLocation IdLoc, IdentifierInfo *Id,
                           QualType T, TypeSourceInfo *TInfo,
                           StorageClass S, Expr *DefArg);

static ParmVarDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

void setObjCMethodScopeInfo(unsigned parameterIndex) {
  ParmVarDeclBits.IsObjCMethodParam = true;
  setParameterIndex(parameterIndex);
}

void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) {
  assert(!ParmVarDeclBits.IsObjCMethodParam)((!ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void>
 (0) : __assert_fail ("!ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1644, __PRETTY_FUNCTION__));

  ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth;
  assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth &&
 "truncation!") ? static_cast<void> (0) : __assert_fail
 ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1648, __PRETTY_FUNCTION__))
         && "truncation!")((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth &&
 "truncation!") ? static_cast<void> (0) : __assert_fail
 ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1648, __PRETTY_FUNCTION__));

  setParameterIndex(parameterIndex);
}

bool isObjCMethodParameter() const {
  return ParmVarDeclBits.IsObjCMethodParam;
}

unsigned getFunctionScopeDepth() const {
  if (ParmVarDeclBits.IsObjCMethodParam) return 0;
  return ParmVarDeclBits.ScopeDepthOrObjCQuals;
}

static constexpr unsigned getMaxFunctionScopeDepth() {
  return (1u << NumScopeDepthOrObjCQualsBits) - 1;
}

/// Returns the index of this parameter in its prototype or method scope.
unsigned getFunctionScopeIndex() const {
  return getParameterIndex();
}

ObjCDeclQualifier getObjCDeclQualifier() const {
  if (!ParmVarDeclBits.IsObjCMethodParam) return OBJC_TQ_None;
  return ObjCDeclQualifier(ParmVarDeclBits.ScopeDepthOrObjCQuals);
}
void setObjCDeclQualifier(ObjCDeclQualifier QTVal) {
  assert(ParmVarDeclBits.IsObjCMethodParam)((ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void>
 (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1676, __PRETTY_FUNCTION__));
  ParmVarDeclBits.ScopeDepthOrObjCQuals = QTVal;
}

/// True if the value passed to this parameter must undergo
/// K&R-style default argument promotion:
///
/// C99 6.5.2.2.
///   If the expression that denotes the called function has a type
///   that does not include a prototype, the integer promotions are
///   performed on each argument, and arguments that have type float
///   are promoted to double.
bool isKNRPromoted() const {
  return ParmVarDeclBits.IsKNRPromoted;
}
void setKNRPromoted(bool promoted) {
  ParmVarDeclBits.IsKNRPromoted = promoted;
}

Expr *getDefaultArg();
const Expr *getDefaultArg() const {
  return const_cast<ParmVarDecl *>(this)->getDefaultArg();
}

void setDefaultArg(Expr *defarg);

/// Retrieve the source range that covers the entire default
/// argument.
SourceRange getDefaultArgRange() const;
void setUninstantiatedDefaultArg(Expr *arg);
Expr *getUninstantiatedDefaultArg();
const Expr *getUninstantiatedDefaultArg() const {
  return const_cast<ParmVarDecl *>(this)->getUninstantiatedDefaultArg();
}

/// Determines whether this parameter has a default argument,
/// either parsed or not.
bool hasDefaultArg() const;

/// Determines whether this parameter has a default argument that has not
/// yet been parsed. This will occur during the processing of a C++ class
/// whose member functions have default arguments, e.g.,
/// @code
///   class X {
///   public:
///     void f(int x = 17); // x has an unparsed default argument now
///   }; // x has a regular default argument now
/// @endcode
bool hasUnparsedDefaultArg() const {
  return ParmVarDeclBits.DefaultArgKind == DAK_Unparsed;
}

bool hasUninstantiatedDefaultArg() const {
  return ParmVarDeclBits.DefaultArgKind == DAK_Uninstantiated;
}

/// Specify that this parameter has an unparsed default argument.
/// The argument will be replaced with a real default argument via
/// setDefaultArg when the class definition enclosing the function
/// declaration that owns this default argument is completed.
void setUnparsedDefaultArg() {
  ParmVarDeclBits.DefaultArgKind = DAK_Unparsed;
}

bool hasInheritedDefaultArg() const {
  return ParmVarDeclBits.HasInheritedDefaultArg;
}

void setHasInheritedDefaultArg(bool I = true) {
  ParmVarDeclBits.HasInheritedDefaultArg = I;
}

QualType getOriginalType() const;

/// Sets the function declaration that owns this
/// ParmVarDecl. Since ParmVarDecls are often created before the
/// FunctionDecls that own them, this routine is required to update
/// the DeclContext appropriately.
void setOwningFunction(DeclContext *FD) { setDeclContext(FD); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ParmVar; }

1760private:
enum { ParameterIndexSentinel = (1 << NumParameterIndexBits) - 1 };

void setParameterIndex(unsigned parameterIndex) {
  if (parameterIndex >= ParameterIndexSentinel) {
    setParameterIndexLarge(parameterIndex);
    return;
  }

  ParmVarDeclBits.ParameterIndex = parameterIndex;
  assert(ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!")((ParmVarDeclBits.ParameterIndex == parameterIndex &&
 "truncation!") ? static_cast<void> (0) : __assert_fail
 ("ParmVarDeclBits.ParameterIndex == parameterIndex && \"truncation!\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 1770, __PRETTY_FUNCTION__));
}
unsigned getParameterIndex() const {
  unsigned d = ParmVarDeclBits.ParameterIndex;
  return d == ParameterIndexSentinel ? getParameterIndexLarge() : d;
}

void setParameterIndexLarge(unsigned parameterIndex);
unsigned getParameterIndexLarge() const;
1779};

1781enum class MultiVersionKind {
None,
Target,
CPUSpecific,
CPUDispatch
1786};

1788/// Represents a function declaration or definition.
1789///
1790/// Since a given function can be declared several times in a program,
1791/// there may be several FunctionDecls that correspond to that
1792/// function. Only one of those FunctionDecls will be found when
1793/// traversing the list of declarations in the context of the
1794/// FunctionDecl (e.g., the translation unit); this FunctionDecl
1795/// contains all of the information known about the function. Other,
1796/// previous declarations of the function are available via the
1797/// getPreviousDecl() chain.
1798class FunctionDecl : public DeclaratorDecl,
                   public DeclContext,
                   public Redeclarable<FunctionDecl> {
// This class stores some data in DeclContext::FunctionDeclBits
// to save some space. Use the provided accessors to access it.
1803public:
/// The kind of templated function a FunctionDecl can be.
enum TemplatedKind {
  // Not templated.
  TK_NonTemplate,
  // The pattern in a function template declaration.
  TK_FunctionTemplate,
  // A non-template function that is an instantiation or explicit
  // specialization of a member of a templated class.
  TK_MemberSpecialization,
  // An instantiation or explicit specialization of a function template.
  // Note: this might have been instantiated from a templated class if it
  // is a class-scope explicit specialization.
  TK_FunctionTemplateSpecialization,
  // A function template specialization that hasn't yet been resolved to a
  // particular specialized function template.
  TK_DependentFunctionTemplateSpecialization
};

/// Stashed information about a defaulted function definition whose body has
/// not yet been lazily generated.
class DefaultedFunctionInfo final
    : llvm::TrailingObjects<DefaultedFunctionInfo, DeclAccessPair> {
  friend TrailingObjects;
  unsigned NumLookups;

public:
  static DefaultedFunctionInfo *Create(ASTContext &Context,
                                       ArrayRef<DeclAccessPair> Lookups);
  /// Get the unqualified lookup results that should be used in this
  /// defaulted function definition.
  ArrayRef<DeclAccessPair> getUnqualifiedLookups() const {
    return {getTrailingObjects<DeclAccessPair>(), NumLookups};
  }
};

1839private:
/// A new[]'d array of pointers to VarDecls for the formal
/// parameters of this function.  This is null if a prototype or if there are
/// no formals.
ParmVarDecl **ParamInfo = nullptr;

/// The active member of this union is determined by
/// FunctionDeclBits.HasDefaultedFunctionInfo.
union {
  /// The body of the function.
  LazyDeclStmtPtr Body;
  /// Information about a future defaulted function definition.
  DefaultedFunctionInfo *DefaultedInfo;
};

unsigned ODRHash;

/// End part of this FunctionDecl's source range.
///
/// We could compute the full range in getSourceRange(). However, when we're
/// dealing with a function definition deserialized from a PCH/AST file,
/// we can only compute the full range once the function body has been
/// de-serialized, so it's far better to have the (sometimes-redundant)
/// EndRangeLoc.
SourceLocation EndRangeLoc;

/// The template or declaration that this declaration
/// describes or was instantiated from, respectively.
///
/// For non-templates, this value will be NULL. For function
/// declarations that describe a function template, this will be a
/// pointer to a FunctionTemplateDecl. For member functions
/// of class template specializations, this will be a MemberSpecializationInfo
/// pointer containing information about the specialization.
/// For function template specializations, this will be a
/// FunctionTemplateSpecializationInfo, which contains information about
/// the template being specialized and the template arguments involved in
/// that specialization.
llvm::PointerUnion<FunctionTemplateDecl *,
                   MemberSpecializationInfo *,
                   FunctionTemplateSpecializationInfo *,
                   DependentFunctionTemplateSpecializationInfo *>
  TemplateOrSpecialization;

/// Provides source/type location info for the declaration name embedded in
/// the DeclaratorDecl base class.
DeclarationNameLoc DNLoc;

/// Specify that this function declaration is actually a function
/// template specialization.
///
/// \param C the ASTContext.
///
/// \param Template the function template that this function template
/// specialization specializes.
///
/// \param TemplateArgs the template arguments that produced this
/// function template specialization from the template.
///
/// \param InsertPos If non-NULL, the position in the function template
/// specialization set where the function template specialization data will
/// be inserted.
///
/// \param TSK the kind of template specialization this is.
///
/// \param TemplateArgsAsWritten location info of template arguments.
///
/// \param PointOfInstantiation point at which the function template
/// specialization was first instantiated.
void setFunctionTemplateSpecialization(ASTContext &C,
                                       FunctionTemplateDecl *Template,
                                     const TemplateArgumentList *TemplateArgs,
                                       void *InsertPos,
                                       TemplateSpecializationKind TSK,
                        const TemplateArgumentListInfo *TemplateArgsAsWritten,
                                       SourceLocation PointOfInstantiation);

/// Specify that this record is an instantiation of the
/// member function FD.
void setInstantiationOfMemberFunction(ASTContext &C, FunctionDecl *FD,
                                      TemplateSpecializationKind TSK);

void setParams(ASTContext &C, ArrayRef<ParmVarDecl *> NewParamInfo);

// This is unfortunately needed because ASTDeclWriter::VisitFunctionDecl
// need to access this bit but we want to avoid making ASTDeclWriter
// a friend of FunctionDeclBitfields just for this.
bool isDeletedBit() const { return FunctionDeclBits.IsDeleted; }

/// Whether an ODRHash has been stored.
bool hasODRHash() const { return FunctionDeclBits.HasODRHash; }

/// State that an ODRHash has been stored.
void setHasODRHash(bool B = true) { FunctionDeclBits.HasODRHash = B; }

1934protected:
FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
             const DeclarationNameInfo &NameInfo, QualType T,
             TypeSourceInfo *TInfo, StorageClass S, bool isInlineSpecified,
             ConstexprSpecKind ConstexprKind,
             Expr *TrailingRequiresClause = nullptr);

using redeclarable_base = Redeclarable<FunctionDecl>;

FunctionDecl *getNextRedeclarationImpl() override {
  return getNextRedeclaration();
}

FunctionDecl *getPreviousDeclImpl() override {
  return getPreviousDecl();
}

FunctionDecl *getMostRecentDeclImpl() override {
  return getMostRecentDecl();
}

1955public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

static FunctionDecl *
Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
       SourceLocation NLoc, DeclarationName N, QualType T,
       TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified = false,
       bool hasWrittenPrototype = true,
       ConstexprSpecKind ConstexprKind = CSK_unspecified,
       Expr *TrailingRequiresClause = nullptr) {
  DeclarationNameInfo NameInfo(N, NLoc);
  return FunctionDecl::Create(C, DC, StartLoc, NameInfo, T, TInfo, SC,
                              isInlineSpecified, hasWrittenPrototype,
                              ConstexprKind, TrailingRequiresClause);
}

static FunctionDecl *Create(ASTContext &C, DeclContext *DC,
                            SourceLocation StartLoc,
                            const DeclarationNameInfo &NameInfo, QualType T,
                            TypeSourceInfo *TInfo, StorageClass SC,
                            bool isInlineSpecified, bool hasWrittenPrototype,
                            ConstexprSpecKind ConstexprKind,
                            Expr *TrailingRequiresClause);

static FunctionDecl *CreateDeserialized(ASTContext &C, unsigned ID);

DeclarationNameInfo getNameInfo() const {
  return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc);
}

void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy,
                          bool Qualified) const override;

void setRangeEnd(SourceLocation E) { EndRangeLoc = E; }

/// Returns the location of the ellipsis of a variadic function.
SourceLocation getEllipsisLoc() const {
  const auto *FPT = getType()->getAs<FunctionProtoType>();
  if (FPT && FPT->isVariadic())
    return FPT->getEllipsisLoc();
  return SourceLocation();
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

// Function definitions.
//
// A function declaration may be:
// - a non defining declaration,
// - a definition. A function may be defined because:
//   - it has a body, or will have it in the case of late parsing.
//   - it has an uninstantiated body. The body does not exist because the
//     function is not used yet, but the declaration is considered a
//     definition and does not allow other definition of this function.
//   - it does not have a user specified body, but it does not allow
//     redefinition, because it is deleted/defaulted or is defined through
//     some other mechanism (alias, ifunc).

/// Returns true if the function has a body.
///
/// The function body might be in any of the (re-)declarations of this
/// function. The variant that accepts a FunctionDecl pointer will set that
/// function declaration to the actual declaration containing the body (if
/// there is one).
bool hasBody(const FunctionDecl *&Definition) const;

bool hasBody() const override {
  const FunctionDecl* Definition;
  return hasBody(Definition);
}

/// Returns whether the function has a trivial body that does not require any
/// specific codegen.
bool hasTrivialBody() const;

/// Returns true if the function has a definition that does not need to be
/// instantiated.
///
/// The variant that accepts a FunctionDecl pointer will set that function
/// declaration to the declaration that is a definition (if there is one).
bool isDefined(const FunctionDecl *&Definition) const;

bool isDefined() const {
  const FunctionDecl* Definition;
  return isDefined(Definition);
}

/// Get the definition for this declaration.
FunctionDecl *getDefinition() {
  const FunctionDecl *Definition;
  if (isDefined(Definition))
    return const_cast<FunctionDecl *>(Definition);
  return nullptr;
}
const FunctionDecl *getDefinition() const {
  return const_cast<FunctionDecl *>(this)->getDefinition();
}

/// Retrieve the body (definition) of the function. The function body might be
/// in any of the (re-)declarations of this function. The variant that accepts
/// a FunctionDecl pointer will set that function declaration to the actual
/// declaration containing the body (if there is one).
/// NOTE: For checking if there is a body, use hasBody() instead, to avoid
/// unnecessary AST de-serialization of the body.
Stmt *getBody(const FunctionDecl *&Definition) const;

Stmt *getBody() const override {
  const FunctionDecl* Definition;
  return getBody(Definition);
}

/// Returns whether this specific declaration of the function is also a
/// definition that does not contain uninstantiated body.
///
/// This does not determine whether the function has been defined (e.g., in a
/// previous definition); for that information, use isDefined.
///
/// Note: the function declaration does not become a definition until the
/// parser reaches the definition, if called before, this function will return
/// `false`.
bool isThisDeclarationADefinition() const {
  return isDeletedAsWritten() || isDefaulted() ||
         doesThisDeclarationHaveABody() || hasSkippedBody() ||
         willHaveBody() || hasDefiningAttr();
}

/// Returns whether this specific declaration of the function has a body.
bool doesThisDeclarationHaveABody() const {
  return (!FunctionDeclBits.HasDefaultedFunctionInfo && Body) ||
         isLateTemplateParsed();
}

void setBody(Stmt *B);
void setLazyBody(uint64_t Offset) {
  FunctionDeclBits.HasDefaultedFunctionInfo = false;
  Body = LazyDeclStmtPtr(Offset);
}

void setDefaultedFunctionInfo(DefaultedFunctionInfo *Info);
DefaultedFunctionInfo *getDefaultedFunctionInfo() const;

/// Whether this function is variadic.
bool isVariadic() const;

/// Whether this function is marked as virtual explicitly.
bool isVirtualAsWritten() const {
  return FunctionDeclBits.IsVirtualAsWritten;
}

/// State that this function is marked as virtual explicitly.
void setVirtualAsWritten(bool V) { FunctionDeclBits.IsVirtualAsWritten = V; }

/// Whether this virtual function is pure, i.e. makes the containing class
/// abstract.
bool isPure() const { return FunctionDeclBits.IsPure; }
void setPure(bool P = true);

/// Whether this templated function will be late parsed.
bool isLateTemplateParsed() const {
  return FunctionDeclBits.IsLateTemplateParsed;
}

/// State that this templated function will be late parsed.
void setLateTemplateParsed(bool ILT = true) {
  FunctionDeclBits.IsLateTemplateParsed = ILT;
}

/// Whether this function is "trivial" in some specialized C++ senses.
/// Can only be true for default constructors, copy constructors,
/// copy assignment operators, and destructors.  Not meaningful until
/// the class has been fully built by Sema.
bool isTrivial() const { return FunctionDeclBits.IsTrivial; }
void setTrivial(bool IT) { FunctionDeclBits.IsTrivial = IT; }

bool isTrivialForCall() const { return FunctionDeclBits.IsTrivialForCall; }
void setTrivialForCall(bool IT) { FunctionDeclBits.IsTrivialForCall = IT; }

/// Whether this function is defaulted. Valid for e.g.
/// special member functions, defaulted comparisions (not methods!).
bool isDefaulted() const { return FunctionDeclBits.IsDefaulted; }
void setDefaulted(bool D = true) { FunctionDeclBits.IsDefaulted = D; }

/// Whether this function is explicitly defaulted.
bool isExplicitlyDefaulted() const {
  return FunctionDeclBits.IsExplicitlyDefaulted;
}

/// State that this function is explicitly defaulted.
void setExplicitlyDefaulted(bool ED = true) {
  FunctionDeclBits.IsExplicitlyDefaulted = ED;
}

/// True if this method is user-declared and was not
/// deleted or defaulted on its first declaration.
bool isUserProvided() const {
  auto *DeclAsWritten = this;
  if (FunctionDecl *Pattern = getTemplateInstantiationPattern())
    DeclAsWritten = Pattern;
  return !(DeclAsWritten->isDeleted() ||
           DeclAsWritten->getCanonicalDecl()->isDefaulted());
}

/// Whether falling off this function implicitly returns null/zero.
/// If a more specific implicit return value is required, front-ends
/// should synthesize the appropriate return statements.
bool hasImplicitReturnZero() const {
  return FunctionDeclBits.HasImplicitReturnZero;
}

/// State that falling off this function implicitly returns null/zero.
/// If a more specific implicit return value is required, front-ends
/// should synthesize the appropriate return statements.
void setHasImplicitReturnZero(bool IRZ) {
  FunctionDeclBits.HasImplicitReturnZero = IRZ;
}

/// Whether this function has a prototype, either because one
/// was explicitly written or because it was "inherited" by merging
/// a declaration without a prototype with a declaration that has a
/// prototype.
bool hasPrototype() const {
  return hasWrittenPrototype() || hasInheritedPrototype();
}

/// Whether this function has a written prototype.
bool hasWrittenPrototype() const {
  return FunctionDeclBits.HasWrittenPrototype;
}

/// State that this function has a written prototype.
void setHasWrittenPrototype(bool P = true) {
  FunctionDeclBits.HasWrittenPrototype = P;
}

/// Whether this function inherited its prototype from a
/// previous declaration.
bool hasInheritedPrototype() const {
  return FunctionDeclBits.HasInheritedPrototype;
}

/// State that this function inherited its prototype from a
/// previous declaration.
void setHasInheritedPrototype(bool P = true) {
  FunctionDeclBits.HasInheritedPrototype = P;
}

/// Whether this is a (C++11) constexpr function or constexpr constructor.
bool isConstexpr() const {
  return FunctionDeclBits.ConstexprKind != CSK_unspecified;
}
void setConstexprKind(ConstexprSpecKind CSK) {
  FunctionDeclBits.ConstexprKind = CSK;
}
ConstexprSpecKind getConstexprKind() const {
  return static_cast<ConstexprSpecKind>(FunctionDeclBits.ConstexprKind);
}
bool isConstexprSpecified() const {
  return FunctionDeclBits.ConstexprKind == CSK_constexpr;
}
bool isConsteval() const {
  return FunctionDeclBits.ConstexprKind == CSK_consteval;
}

/// Whether the instantiation of this function is pending.
/// This bit is set when the decision to instantiate this function is made
/// and unset if and when the function body is created. That leaves out
/// cases where instantiation did not happen because the template definition
/// was not seen in this TU. This bit remains set in those cases, under the
/// assumption that the instantiation will happen in some other TU.
bool instantiationIsPending() const {
  return FunctionDeclBits.InstantiationIsPending;
}

/// State that the instantiation of this function is pending.
/// (see instantiationIsPending)
void setInstantiationIsPending(bool IC) {
  FunctionDeclBits.InstantiationIsPending = IC;
}

/// Indicates the function uses __try.
bool usesSEHTry() const { return FunctionDeclBits.UsesSEHTry; }
void setUsesSEHTry(bool UST) { FunctionDeclBits.UsesSEHTry = UST; }

/// Indicates the function uses Floating Point constrained intrinsics
bool usesFPIntrin() const { return FunctionDeclBits.UsesFPIntrin; }
void setUsesFPIntrin(bool Val) { FunctionDeclBits.UsesFPIntrin = Val; }

/// Whether this function has been deleted.
///
/// A function that is "deleted" (via the C++0x "= delete" syntax)
/// acts like a normal function, except that it cannot actually be
/// called or have its address taken. Deleted functions are
/// typically used in C++ overload resolution to attract arguments
/// whose type or lvalue/rvalue-ness would permit the use of a
/// different overload that would behave incorrectly. For example,
/// one might use deleted functions to ban implicit conversion from
/// a floating-point number to an Integer type:
///
/// @code
/// struct Integer {
///   Integer(long); // construct from a long
///   Integer(double) = delete; // no construction from float or double
///   Integer(long double) = delete; // no construction from long double
/// };
/// @endcode
// If a function is deleted, its first declaration must be.
bool isDeleted() const {
  return getCanonicalDecl()->FunctionDeclBits.IsDeleted;
}

bool isDeletedAsWritten() const {
  return FunctionDeclBits.IsDeleted && !isDefaulted();
}

void setDeletedAsWritten(bool D = true) { FunctionDeclBits.IsDeleted = D; }

/// Determines whether this function is "main", which is the
/// entry point into an executable program.
bool isMain() const;

/// Determines whether this function is a MSVCRT user defined entry
/// point.
bool isMSVCRTEntryPoint() const;

/// Determines whether this operator new or delete is one
/// of the reserved global placement operators:
///    void *operator new(size_t, void *);
///    void *operator new[](size_t, void *);
///    void operator delete(void *, void *);
///    void operator delete[](void *, void *);
/// These functions have special behavior under [new.delete.placement]:
///    These functions are reserved, a C++ program may not define
///    functions that displace the versions in the Standard C++ library.
///    The provisions of [basic.stc.dynamic] do not apply to these
///    reserved placement forms of operator new and operator delete.
///
/// This function must be an allocation or deallocation function.
bool isReservedGlobalPlacementOperator() const;

/// Determines whether this function is one of the replaceable
/// global allocation functions:
///    void *operator new(size_t);
///    void *operator new(size_t, const std::nothrow_t &) noexcept;
///    void *operator new[](size_t);
///    void *operator new[](size_t, const std::nothrow_t &) noexcept;
///    void operator delete(void *) noexcept;
///    void operator delete(void *, std::size_t) noexcept;      [C++1y]
///    void operator delete(void *, const std::nothrow_t &) noexcept;
///    void operator delete[](void *) noexcept;
///    void operator delete[](void *, std::size_t) noexcept;    [C++1y]
///    void operator delete[](void *, const std::nothrow_t &) noexcept;
/// These functions have special behavior under C++1y [expr.new]:
///    An implementation is allowed to omit a call to a replaceable global
///    allocation function. [...]
///
/// If this function is an aligned allocation/deallocation function, return
/// the parameter number of the requested alignment through AlignmentParam.
///
/// If this function is an allocation/deallocation function that takes
/// the `std::nothrow_t` tag, return true through IsNothrow,
bool isReplaceableGlobalAllocationFunction(
    Optional<unsigned> *AlignmentParam = nullptr,
    bool *IsNothrow = nullptr) const;

/// Determine if this function provides an inline implementation of a builtin.
bool isInlineBuiltinDeclaration() const;

/// Determine whether this is a destroying operator delete.
bool isDestroyingOperatorDelete() const;

/// Compute the language linkage.
LanguageLinkage getLanguageLinkage() const;

/// Determines whether this function is a function with
/// external, C linkage.
bool isExternC() const;

/// Determines whether this function's context is, or is nested within,
/// a C++ extern "C" linkage spec.
bool isInExternCContext() const;

/// Determines whether this function's context is, or is nested within,
/// a C++ extern "C++" linkage spec.
bool isInExternCXXContext() const;

/// Determines whether this is a global function.
bool isGlobal() const;

/// Determines whether this function is known to be 'noreturn', through
/// an attribute on its declaration or its type.
bool isNoReturn() const;

/// True if the function was a definition but its body was skipped.
bool hasSkippedBody() const { return FunctionDeclBits.HasSkippedBody; }
void setHasSkippedBody(bool Skipped = true) {
  FunctionDeclBits.HasSkippedBody = Skipped;
}

/// True if this function will eventually have a body, once it's fully parsed.
bool willHaveBody() const { return FunctionDeclBits.WillHaveBody; }
void setWillHaveBody(bool V = true) { FunctionDeclBits.WillHaveBody = V; }

/// True if this function is considered a multiversioned function.
bool isMultiVersion() const {
  return getCanonicalDecl()->FunctionDeclBits.IsMultiVersion;
}

/// Sets the multiversion state for this declaration and all of its
/// redeclarations.
void setIsMultiVersion(bool V = true) {
  getCanonicalDecl()->FunctionDeclBits.IsMultiVersion = V;
}

/// Gets the kind of multiversioning attribute this declaration has. Note that
/// this can return a value even if the function is not multiversion, such as
/// the case of 'target'.
MultiVersionKind getMultiVersionKind() const;


/// True if this function is a multiversioned dispatch function as a part of
/// the cpu_specific/cpu_dispatch functionality.
bool isCPUDispatchMultiVersion() const;
/// True if this function is a multiversioned processor specific function as a
/// part of the cpu_specific/cpu_dispatch functionality.
bool isCPUSpecificMultiVersion() const;

/// True if this function is a multiversioned dispatch function as a part of
/// the target functionality.
bool isTargetMultiVersion() const;

/// \brief Get the associated-constraints of this function declaration.
/// Currently, this will either be a vector of size 1 containing the
/// trailing-requires-clause or an empty vector.
///
/// Use this instead of getTrailingRequiresClause for concepts APIs that
/// accept an ArrayRef of constraint expressions.
void getAssociatedConstraints(SmallVectorImpl<const Expr *> &AC) const {
  if (auto *TRC = getTrailingRequiresClause())
    AC.push_back(TRC);
}

void setPreviousDeclaration(FunctionDecl * PrevDecl);

FunctionDecl *getCanonicalDecl() override;
const FunctionDecl *getCanonicalDecl() const {
  return const_cast<FunctionDecl*>(this)->getCanonicalDecl();
}

unsigned getBuiltinID(bool ConsiderWrapperFunctions = false) const;

// ArrayRef interface to parameters.
ArrayRef<ParmVarDecl *> parameters() const {
  return {ParamInfo, getNumParams()};
}
MutableArrayRef<ParmVarDecl *> parameters() {
  return {ParamInfo, getNumParams()};
}

// Iterator access to formal parameters.
using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator;
using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator;

bool param_empty() const { return parameters().empty(); }
param_iterator param_begin() { return parameters().begin(); }
param_iterator param_end() { return parameters().end(); }
param_const_iterator param_begin() const { return parameters().begin(); }
param_const_iterator param_end() const { return parameters().end(); }
size_t param_size() const { return parameters().size(); }

/// Return the number of parameters this function must have based on its
/// FunctionType.  This is the length of the ParamInfo array after it has been
/// created.
unsigned getNumParams() const;

const ParmVarDecl *getParamDecl(unsigned i) const {
  assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast
<void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2441, __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
ParmVarDecl *getParamDecl(unsigned i) {
  assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast
<void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2445, __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
void setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
  setParams(getASTContext(), NewParamInfo);
}

/// Returns the minimum number of arguments needed to call this function. This
/// may be fewer than the number of function parameters, if some of the
/// parameters have default arguments (in C++).
unsigned getMinRequiredArguments() const;

/// Determine whether this function has a single parameter, or multiple
/// parameters where all but the first have default arguments.
///
/// This notion is used in the definition of copy/move constructors and
/// initializer list constructors. Note that, unlike getMinRequiredArguments,
/// parameter packs are not treated specially here.
bool hasOneParamOrDefaultArgs() const;

/// Find the source location information for how the type of this function
/// was written. May be absent (for example if the function was declared via
/// a typedef) and may contain a different type from that of the function
/// (for example if the function type was adjusted by an attribute).
FunctionTypeLoc getFunctionTypeLoc() const;

QualType getReturnType() const {
  return getType()->castAs<FunctionType>()->getReturnType();
}

/// Attempt to compute an informative source range covering the
/// function return type. This may omit qualifiers and other information with
/// limited representation in the AST.
SourceRange getReturnTypeSourceRange() const;

/// Attempt to compute an informative source range covering the
/// function parameters, including the ellipsis of a variadic function.
/// The source range excludes the parentheses, and is invalid if there are
/// no parameters and no ellipsis.
SourceRange getParametersSourceRange() const;

/// Get the declared return type, which may differ from the actual return
/// type if the return type is deduced.
QualType getDeclaredReturnType() const {
  auto *TSI = getTypeSourceInfo();
  QualType T = TSI ? TSI->getType() : getType();
  return T->castAs<FunctionType>()->getReturnType();
}

/// Gets the ExceptionSpecificationType as declared.
ExceptionSpecificationType getExceptionSpecType() const {
  auto *TSI = getTypeSourceInfo();
  QualType T = TSI ? TSI->getType() : getType();
  const auto *FPT = T->getAs<FunctionProtoType>();
  return FPT ? FPT->getExceptionSpecType() : EST_None;
}

/// Attempt to compute an informative source range covering the
/// function exception specification, if any.
SourceRange getExceptionSpecSourceRange() const;

/// Determine the type of an expression that calls this function.
QualType getCallResultType() const {
  return getType()->castAs<FunctionType>()->getCallResultType(
      getASTContext());
}

/// Returns the storage class as written in the source. For the
/// computed linkage of symbol, see getLinkage.
StorageClass getStorageClass() const {
  return static_cast<StorageClass>(FunctionDeclBits.SClass);
}

/// Sets the storage class as written in the source.
void setStorageClass(StorageClass SClass) {
  FunctionDeclBits.SClass = SClass;
}

/// Determine whether the "inline" keyword was specified for this
/// function.
bool isInlineSpecified() const { return FunctionDeclBits.IsInlineSpecified; }

/// Set whether the "inline" keyword was specified for this function.
void setInlineSpecified(bool I) {
  FunctionDeclBits.IsInlineSpecified = I;
  FunctionDeclBits.IsInline = I;
}

/// Flag that this function is implicitly inline.
void setImplicitlyInline(bool I = true) { FunctionDeclBits.IsInline = I; }

/// Determine whether this function should be inlined, because it is
/// either marked "inline" or "constexpr" or is a member function of a class
/// that was defined in the class body.
bool isInlined() const { return FunctionDeclBits.IsInline; }

bool isInlineDefinitionExternallyVisible() const;

bool isMSExternInline() const;

bool doesDeclarationForceExternallyVisibleDefinition() const;

bool isStatic() const { return getStorageClass() == SC_Static; }

/// Whether this function declaration represents an C++ overloaded
/// operator, e.g., "operator+".
bool isOverloadedOperator() const {
  return getOverloadedOperator() != OO_None;
}

OverloadedOperatorKind getOverloadedOperator() const;

const IdentifierInfo *getLiteralIdentifier() const;

/// If this function is an instantiation of a member function
/// of a class template specialization, retrieves the function from
/// which it was instantiated.
///
/// This routine will return non-NULL for (non-templated) member
/// functions of class templates and for instantiations of function
/// templates. For example, given:
///
/// \code
/// template<typename T>
/// struct X {
///   void f(T);
/// };
/// \endcode
///
/// The declaration for X<int>::f is a (non-templated) FunctionDecl
/// whose parent is the class template specialization X<int>. For
/// this declaration, getInstantiatedFromFunction() will return
/// the FunctionDecl X<T>::A. When a complete definition of
/// X<int>::A is required, it will be instantiated from the
/// declaration returned by getInstantiatedFromMemberFunction().
FunctionDecl *getInstantiatedFromMemberFunction() const;

/// What kind of templated function this is.
TemplatedKind getTemplatedKind() const;

/// If this function is an instantiation of a member function of a
/// class template specialization, retrieves the member specialization
/// information.
MemberSpecializationInfo *getMemberSpecializationInfo() const;

/// Specify that this record is an instantiation of the
/// member function FD.
void setInstantiationOfMemberFunction(FunctionDecl *FD,
                                      TemplateSpecializationKind TSK) {
  setInstantiationOfMemberFunction(getASTContext(), FD, TSK);
}

/// Retrieves the function template that is described by this
/// function declaration.
///
/// Every function template is represented as a FunctionTemplateDecl
/// and a FunctionDecl (or something derived from FunctionDecl). The
/// former contains template properties (such as the template
/// parameter lists) while the latter contains the actual
/// description of the template's
/// contents. FunctionTemplateDecl::getTemplatedDecl() retrieves the
/// FunctionDecl that describes the function template,
/// getDescribedFunctionTemplate() retrieves the
/// FunctionTemplateDecl from a FunctionDecl.
FunctionTemplateDecl *getDescribedFunctionTemplate() const;

void setDescribedFunctionTemplate(FunctionTemplateDecl *Template);

/// Determine whether this function is a function template
/// specialization.
bool isFunctionTemplateSpecialization() const {
  return getPrimaryTemplate() != nullptr;
}

/// If this function is actually a function template specialization,
/// retrieve information about this function template specialization.
/// Otherwise, returns NULL.
FunctionTemplateSpecializationInfo *getTemplateSpecializationInfo() const;

/// Determines whether this function is a function template
/// specialization or a member of a class template specialization that can
/// be implicitly instantiated.
bool isImplicitlyInstantiable() const;

/// Determines if the given function was instantiated from a
/// function template.
bool isTemplateInstantiation() const;

/// Retrieve the function declaration from which this function could
/// be instantiated, if it is an instantiation (rather than a non-template
/// or a specialization, for example).
///
/// If \p ForDefinition is \c false, explicit specializations will be treated
/// as if they were implicit instantiations. This will then find the pattern
/// corresponding to non-definition portions of the declaration, such as
/// default arguments and the exception specification.
FunctionDecl *
getTemplateInstantiationPattern(bool ForDefinition = true) const;

/// Retrieve the primary template that this function template
/// specialization either specializes or was instantiated from.
///
/// If this function declaration is not a function template specialization,
/// returns NULL.
FunctionTemplateDecl *getPrimaryTemplate() const;

/// Retrieve the template arguments used to produce this function
/// template specialization from the primary template.
///
/// If this function declaration is not a function template specialization,
/// returns NULL.
const TemplateArgumentList *getTemplateSpecializationArgs() const;

/// Retrieve the template argument list as written in the sources,
/// if any.
///
/// If this function declaration is not a function template specialization
/// or if it had no explicit template argument list, returns NULL.
/// Note that it an explicit template argument list may be written empty,
/// e.g., template<> void foo<>(char* s);
const ASTTemplateArgumentListInfo*
getTemplateSpecializationArgsAsWritten() const;

/// Specify that this function declaration is actually a function
/// template specialization.
///
/// \param Template the function template that this function template
/// specialization specializes.
///
/// \param TemplateArgs the template arguments that produced this
/// function template specialization from the template.
///
/// \param InsertPos If non-NULL, the position in the function template
/// specialization set where the function template specialization data will
/// be inserted.
///
/// \param TSK the kind of template specialization this is.
///
/// \param TemplateArgsAsWritten location info of template arguments.
///
/// \param PointOfInstantiation point at which the function template
/// specialization was first instantiated.
void setFunctionTemplateSpecialization(FunctionTemplateDecl *Template,
              const TemplateArgumentList *TemplateArgs,
              void *InsertPos,
              TemplateSpecializationKind TSK = TSK_ImplicitInstantiation,
              const TemplateArgumentListInfo *TemplateArgsAsWritten = nullptr,
              SourceLocation PointOfInstantiation = SourceLocation()) {
  setFunctionTemplateSpecialization(getASTContext(), Template, TemplateArgs,
                                    InsertPos, TSK, TemplateArgsAsWritten,
                                    PointOfInstantiation);
}

/// Specifies that this function declaration is actually a
/// dependent function template specialization.
void setDependentTemplateSpecialization(ASTContext &Context,
                           const UnresolvedSetImpl &Templates,
                    const TemplateArgumentListInfo &TemplateArgs);

DependentFunctionTemplateSpecializationInfo *
getDependentSpecializationInfo() const;

/// Determine what kind of template instantiation this function
/// represents.
TemplateSpecializationKind getTemplateSpecializationKind() const;

/// Determine the kind of template specialization this function represents
/// for the purpose of template instantiation.
TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const;

/// Determine what kind of template instantiation this function
/// represents.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                      SourceLocation PointOfInstantiation = SourceLocation());

/// Retrieve the (first) point of instantiation of a function template
/// specialization or a member of a class template specialization.
///
/// \returns the first point of instantiation, if this function was
/// instantiated from a template; otherwise, returns an invalid source
/// location.
SourceLocation getPointOfInstantiation() const;

/// Determine whether this is or was instantiated from an out-of-line
/// definition of a member function.
bool isOutOfLine() const override;

/// Identify a memory copying or setting function.
/// If the given function is a memory copy or setting function, returns
/// the corresponding Builtin ID. If the function is not a memory function,
/// returns 0.
unsigned getMemoryFunctionKind() const;

/// Returns ODRHash of the function.  This value is calculated and
/// stored on first call, then the stored value returned on the other calls.
unsigned getODRHash();

/// Returns cached ODRHash of the function.  This must have been previously
/// computed and stored.
unsigned getODRHash() const;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstFunction && K <= lastFunction;
}
static DeclContext *castToDeclContext(const FunctionDecl *D) {
  return static_cast<DeclContext *>(const_cast<FunctionDecl*>(D));
}
static FunctionDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<FunctionDecl *>(const_cast<DeclContext*>(DC));
}
2758};

2760/// Represents a member of a struct/union/class.
2761class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> {
unsigned BitField : 1;
unsigned Mutable : 1;
mutable unsigned CachedFieldIndex : 30;

/// The kinds of value we can store in InitializerOrBitWidth.
///
/// Note that this is compatible with InClassInitStyle except for
/// ISK_CapturedVLAType.
enum InitStorageKind {
  /// If the pointer is null, there's nothing special.  Otherwise,
  /// this is a bitfield and the pointer is the Expr* storing the
  /// bit-width.
  ISK_NoInit = (unsigned) ICIS_NoInit,

  /// The pointer is an (optional due to delayed parsing) Expr*
  /// holding the copy-initializer.
  ISK_InClassCopyInit = (unsigned) ICIS_CopyInit,

  /// The pointer is an (optional due to delayed parsing) Expr*
  /// holding the list-initializer.
  ISK_InClassListInit = (unsigned) ICIS_ListInit,

  /// The pointer is a VariableArrayType* that's been captured;
  /// the enclosing context is a lambda or captured statement.
  ISK_CapturedVLAType,
};

/// If this is a bitfield with a default member initializer, this
/// structure is used to represent the two expressions.
struct InitAndBitWidth {
  Expr *Init;
  Expr *BitWidth;
};

/// Storage for either the bit-width, the in-class initializer, or
/// both (via InitAndBitWidth), or the captured variable length array bound.
///
/// If the storage kind is ISK_InClassCopyInit or
/// ISK_InClassListInit, but the initializer is null, then this
/// field has an in-class initializer that has not yet been parsed
/// and attached.
// FIXME: Tail-allocate this to reduce the size of FieldDecl in the
// overwhelmingly common case that we have none of these things.
llvm::PointerIntPair<void *, 2, InitStorageKind> InitStorage;

2807protected:
FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc,
          SourceLocation IdLoc, IdentifierInfo *Id,
          QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
          InClassInitStyle InitStyle)
  : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
    BitField(false), Mutable(Mutable), CachedFieldIndex(0),
    InitStorage(nullptr, (InitStorageKind) InitStyle) {
  if (BW)
    setBitWidth(BW);
}

2819public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static FieldDecl *Create(const ASTContext &C, DeclContext *DC,
                         SourceLocation StartLoc, SourceLocation IdLoc,
                         IdentifierInfo *Id, QualType T,
                         TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
                         InClassInitStyle InitStyle);

static FieldDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// Returns the index of this field within its record,
/// as appropriate for passing to ASTRecordLayout::getFieldOffset.
unsigned getFieldIndex() const;

/// Determines whether this field is mutable (C++ only).
bool isMutable() const { return Mutable; }

/// Determines whether this field is a bitfield.
bool isBitField() const { return BitField; }

/// Determines whether this is an unnamed bitfield.
bool isUnnamedBitfield() const { return isBitField() && !getDeclName(); }

/// Determines whether this field is a
/// representative for an anonymous struct or union. Such fields are
/// unnamed and are implicitly generated by the implementation to
/// store the data for the anonymous union or struct.
bool isAnonymousStructOrUnion() const;

Expr *getBitWidth() const {
  if (!BitField)
    return nullptr;
  void *Ptr = InitStorage.getPointer();
  if (getInClassInitStyle())
    return static_cast<InitAndBitWidth*>(Ptr)->BitWidth;
  return static_cast<Expr*>(Ptr);
}

unsigned getBitWidthValue(const ASTContext &Ctx) const;

/// Set the bit-field width for this member.
// Note: used by some clients (i.e., do not remove it).
void setBitWidth(Expr *Width) {
  assert(!hasCapturedVLAType() && !BitField &&((!hasCapturedVLAType() && !BitField && "bit width or captured type already set"
) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2865, __PRETTY_FUNCTION__))
         "bit width or captured type already set")((!hasCapturedVLAType() && !BitField && "bit width or captured type already set"
) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2865, __PRETTY_FUNCTION__));
  assert(Width && "no bit width specified")((Width && "no bit width specified") ? static_cast<
void> (0) : __assert_fail ("Width && \"no bit width specified\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2866, __PRETTY_FUNCTION__));
  InitStorage.setPointer(
      InitStorage.getInt()
          ? new (getASTContext())
                InitAndBitWidth{getInClassInitializer(), Width}
          : static_cast<void*>(Width));
  BitField = true;
}

/// Remove the bit-field width from this member.
// Note: used by some clients (i.e., do not remove it).
void removeBitWidth() {
  assert(isBitField() && "no bitfield width to remove")((isBitField() && "no bitfield width to remove") ? static_cast
<void> (0) : __assert_fail ("isBitField() && \"no bitfield width to remove\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2878, __PRETTY_FUNCTION__));
  InitStorage.setPointer(getInClassInitializer());
  BitField = false;
}

/// Is this a zero-length bit-field? Such bit-fields aren't really bit-fields
/// at all and instead act as a separator between contiguous runs of other
/// bit-fields.
bool isZeroLengthBitField(const ASTContext &Ctx) const;

/// Determine if this field is a subobject of zero size, that is, either a
/// zero-length bit-field or a field of empty class type with the
/// [[no_unique_address]] attribute.
bool isZeroSize(const ASTContext &Ctx) const;

/// Get the kind of (C++11) default member initializer that this field has.
InClassInitStyle getInClassInitStyle() const {
  InitStorageKind storageKind = InitStorage.getInt();
  return (storageKind == ISK_CapturedVLAType
            ? ICIS_NoInit : (InClassInitStyle) storageKind);
}

/// Determine whether this member has a C++11 default member initializer.
bool hasInClassInitializer() const {
  return getInClassInitStyle() != ICIS_NoInit;
}

/// Get the C++11 default member initializer for this member, or null if one
/// has not been set. If a valid declaration has a default member initializer,
/// but this returns null, then we have not parsed and attached it yet.
Expr *getInClassInitializer() const {
  if (!hasInClassInitializer())
    return nullptr;
  void *Ptr = InitStorage.getPointer();
  if (BitField)
    return static_cast<InitAndBitWidth*>(Ptr)->Init;
  return static_cast<Expr*>(Ptr);
}

/// Set the C++11 in-class initializer for this member.
void setInClassInitializer(Expr *Init) {
  assert(hasInClassInitializer() && !getInClassInitializer())((hasInClassInitializer() && !getInClassInitializer()
) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && !getInClassInitializer()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2919, __PRETTY_FUNCTION__));
  if (BitField)
    static_cast<InitAndBitWidth*>(InitStorage.getPointer())->Init = Init;
  else
    InitStorage.setPointer(Init);
}

/// Remove the C++11 in-class initializer from this member.
void removeInClassInitializer() {
  assert(hasInClassInitializer() && "no initializer to remove")((hasInClassInitializer() && "no initializer to remove"
) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && \"no initializer to remove\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 2928, __PRETTY_FUNCTION__));
  InitStorage.setPointerAndInt(getBitWidth(), ISK_NoInit);
}

/// Determine whether this member captures the variable length array
/// type.
bool hasCapturedVLAType() const {
  return InitStorage.getInt() == ISK_CapturedVLAType;
}

/// Get the captured variable length array type.
const VariableArrayType *getCapturedVLAType() const {
  return hasCapturedVLAType() ? static_cast<const VariableArrayType *>(
                                    InitStorage.getPointer())
                              : nullptr;
}

/// Set the captured variable length array type for this field.
void setCapturedVLAType(const VariableArrayType *VLAType);

/// Returns the parent of this field declaration, which
/// is the struct in which this field is defined.
///
/// Returns null if this is not a normal class/struct field declaration, e.g.
/// ObjCAtDefsFieldDecl, ObjCIvarDecl.
const RecordDecl *getParent() const {
  return dyn_cast<RecordDecl>(getDeclContext());
}

RecordDecl *getParent() {
  return dyn_cast<RecordDecl>(getDeclContext());
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

/// Retrieves the canonical declaration of this field.
FieldDecl *getCanonicalDecl() override { return getFirstDecl(); }
const FieldDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstField && K <= lastField; }
2970};

2972/// An instance of this object exists for each enum constant
2973/// that is defined.  For example, in "enum X {a,b}", each of a/b are
2974/// EnumConstantDecl's, X is an instance of EnumDecl, and the type of a/b is a
2975/// TagType for the X EnumDecl.
2976class EnumConstantDecl : public ValueDecl, public Mergeable<EnumConstantDecl> {
Stmt *Init; // an integer constant expression
llvm::APSInt Val; // The value.

2980protected:
EnumConstantDecl(DeclContext *DC, SourceLocation L,
                 IdentifierInfo *Id, QualType T, Expr *E,
                 const llvm::APSInt &V)
  : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt*)E), Val(V) {}

2986public:
friend class StmtIteratorBase;

static EnumConstantDecl *Create(ASTContext &C, EnumDecl *DC,
                                SourceLocation L, IdentifierInfo *Id,
                                QualType T, Expr *E,
                                const llvm::APSInt &V);
static EnumConstantDecl *CreateDeserialized(ASTContext &C, unsigned ID);

const Expr *getInitExpr() const { return (const Expr*) Init; }
Expr *getInitExpr() { return (Expr*) Init; }
const llvm::APSInt &getInitVal() const { return Val; }

void setInitExpr(Expr *E) { Init = (Stmt*) E; }
void setInitVal(const llvm::APSInt &V) { Val = V; }

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

/// Retrieves the canonical declaration of this enumerator.
EnumConstantDecl *getCanonicalDecl() override { return getFirstDecl(); }
const EnumConstantDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == EnumConstant; }
3011};

3013/// Represents a field injected from an anonymous union/struct into the parent
3014/// scope. These are always implicit.
3015class IndirectFieldDecl : public ValueDecl,
                        public Mergeable<IndirectFieldDecl> {
NamedDecl **Chaining;
unsigned ChainingSize;

IndirectFieldDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                  DeclarationName N, QualType T,
                  MutableArrayRef<NamedDecl *> CH);

void anchor() override;

3026public:
friend class ASTDeclReader;

static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation L, IdentifierInfo *Id,
                                 QualType T, llvm::MutableArrayRef<NamedDecl *> CH);

static IndirectFieldDecl *CreateDeserialized(ASTContext &C, unsigned ID);

using chain_iterator = ArrayRef<NamedDecl *>::const_iterator;

ArrayRef<NamedDecl *> chain() const {
  return llvm::makeArrayRef(Chaining, ChainingSize);
}
chain_iterator chain_begin() const { return chain().begin(); }
chain_iterator chain_end() const { return chain().end(); }

unsigned getChainingSize() const { return ChainingSize; }

FieldDecl *getAnonField() const {
  assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail
 ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 3046, __PRETTY_FUNCTION__));
  return cast<FieldDecl>(chain().back());
}

VarDecl *getVarDecl() const {
  assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail
 ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 3051, __PRETTY_FUNCTION__));
  return dyn_cast<VarDecl>(chain().front());
}

IndirectFieldDecl *getCanonicalDecl() override { return getFirstDecl(); }
const IndirectFieldDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == IndirectField; }
3061};

3063/// Represents a declaration of a type.
3064class TypeDecl : public NamedDecl {
friend class ASTContext;

/// This indicates the Type object that represents
/// this TypeDecl.  It is a cache maintained by
/// ASTContext::getTypedefType, ASTContext::getTagDeclType, and
/// ASTContext::getTemplateTypeParmType, and TemplateTypeParmDecl.
mutable const Type *TypeForDecl = nullptr;

/// The start of the source range for this declaration.
SourceLocation LocStart;

void anchor() override;

3078protected:
TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id,
         SourceLocation StartL = SourceLocation())
  : NamedDecl(DK, DC, L, Id), LocStart(StartL) {}

3083public:
// Low-level accessor. If you just want the type defined by this node,
// check out ASTContext::getTypeDeclType or one of
// ASTContext::getTypedefType, ASTContext::getRecordType, etc. if you
// already know the specific kind of node this is.
const Type *getTypeForDecl() const { return TypeForDecl; }
void setTypeForDecl(const Type *TD) { TypeForDecl = TD; }

SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; }
void setLocStart(SourceLocation L) { LocStart = L; }
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  if (LocStart.isValid())
    return SourceRange(LocStart, getLocation());
  else
    return SourceRange(getLocation());
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstType && K <= lastType; }
3103};

3105/// Base class for declarations which introduce a typedef-name.
3106class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> {
struct alignas(8) ModedTInfo {
  TypeSourceInfo *first;
  QualType second;
};

/// If int part is 0, we have not computed IsTransparentTag.
/// Otherwise, IsTransparentTag is (getInt() >> 1).
mutable llvm::PointerIntPair<
    llvm::PointerUnion<TypeSourceInfo *, ModedTInfo *>, 2>
    MaybeModedTInfo;

void anchor() override;

3120protected:
TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC,
                SourceLocation StartLoc, SourceLocation IdLoc,
                IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C),
      MaybeModedTInfo(TInfo, 0) {}

using redeclarable_base = Redeclarable<TypedefNameDecl>;

TypedefNameDecl *getNextRedeclarationImpl() override {
  return getNextRedeclaration();
}

TypedefNameDecl *getPreviousDeclImpl() override {
  return getPreviousDecl();
}

TypedefNameDecl *getMostRecentDeclImpl() override {
  return getMostRecentDecl();
}

3141public:
using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

bool isModed() const {
  return MaybeModedTInfo.getPointer().is<ModedTInfo *>();
}

TypeSourceInfo *getTypeSourceInfo() const {
  return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->first
                   : MaybeModedTInfo.getPointer().get<TypeSourceInfo *>();
}

QualType getUnderlyingType() const {
  return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->second
                   : MaybeModedTInfo.getPointer()
                         .get<TypeSourceInfo *>()
                         ->getType();
}

void setTypeSourceInfo(TypeSourceInfo *newType) {
  MaybeModedTInfo.setPointer(newType);
}

void setModedTypeSourceInfo(TypeSourceInfo *unmodedTSI, QualType modedTy) {
  MaybeModedTInfo.setPointer(new (getASTContext(), 8)
                                 ModedTInfo({unmodedTSI, modedTy}));
}

/// Retrieves the canonical declaration of this typedef-name.
TypedefNameDecl *getCanonicalDecl() override { return getFirstDecl(); }
const TypedefNameDecl *getCanonicalDecl() const { return getFirstDecl(); }

/// Retrieves the tag declaration for which this is the typedef name for
/// linkage purposes, if any.
///
/// \param AnyRedecl Look for the tag declaration in any redeclaration of
/// this typedef declaration.
TagDecl *getAnonDeclWithTypedefName(bool AnyRedecl = false) const;

/// Determines if this typedef shares a name and spelling location with its
/// underlying tag type, as is the case with the NS_ENUM macro.
bool isTransparentTag() const {
  if (MaybeModedTInfo.getInt())
    return MaybeModedTInfo.getInt() & 0x2;
  return isTransparentTagSlow();
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstTypedefName && K <= lastTypedefName;
}

3202private:
bool isTransparentTagSlow() const;
3204};

3206/// Represents the declaration of a typedef-name via the 'typedef'
3207/// type specifier.
3208class TypedefDecl : public TypedefNameDecl {
TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
            SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {}

3213public:
static TypedefDecl *Create(ASTContext &C, DeclContext *DC,
                           SourceLocation StartLoc, SourceLocation IdLoc,
                           IdentifierInfo *Id, TypeSourceInfo *TInfo);
static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Typedef; }
3224};

3226/// Represents the declaration of a typedef-name via a C++11
3227/// alias-declaration.
3228class TypeAliasDecl : public TypedefNameDecl {
/// The template for which this is the pattern, if any.
TypeAliasTemplateDecl *Template;

TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
              SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo),
      Template(nullptr) {}

3237public:
static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC,
                             SourceLocation StartLoc, SourceLocation IdLoc,
                             IdentifierInfo *Id, TypeSourceInfo *TInfo);
static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

TypeAliasTemplateDecl *getDescribedAliasTemplate() const { return Template; }
void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT) { Template = TAT; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TypeAlias; }
3251};

3253/// Represents the declaration of a struct/union/class/enum.
3254class TagDecl : public TypeDecl,
              public DeclContext,
              public Redeclarable<TagDecl> {
// This class stores some data in DeclContext::TagDeclBits
// to save some space. Use the provided accessors to access it.
3259public:
// This is really ugly.
using TagKind = TagTypeKind;

3263private:
SourceRange BraceRange;

// A struct representing syntactic qualifier info,
// to be used for the (uncommon) case of out-of-line declarations.
using ExtInfo = QualifierInfo;

/// If the (out-of-line) tag declaration name
/// is qualified, it points to the qualifier info (nns and range);
/// otherwise, if the tag declaration is anonymous and it is part of
/// a typedef or alias, it points to the TypedefNameDecl (used for mangling);
/// otherwise, if the tag declaration is anonymous and it is used as a
/// declaration specifier for variables, it points to the first VarDecl (used
/// for mangling);
/// otherwise, it is a null (TypedefNameDecl) pointer.
llvm::PointerUnion<TypedefNameDecl *, ExtInfo *> TypedefNameDeclOrQualifier;

bool hasExtInfo() const { return TypedefNameDeclOrQualifier.is<ExtInfo *>(); }
ExtInfo *getExtInfo() { return TypedefNameDeclOrQualifier.get<ExtInfo *>(); }
const ExtInfo *getExtInfo() const {
  return TypedefNameDeclOrQualifier.get<ExtInfo *>();
}

3286protected:
TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
        SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
        SourceLocation StartL);

using redeclarable_base = Redeclarable<TagDecl>;

TagDecl *getNextRedeclarationImpl() override {
  return getNextRedeclaration();
}

TagDecl *getPreviousDeclImpl() override {
  return getPreviousDecl();
}

TagDecl *getMostRecentDeclImpl() override {
  return getMostRecentDecl();
}

/// Completes the definition of this tag declaration.
///
/// This is a helper function for derived classes.
void completeDefinition();

/// True if this decl is currently being defined.
void setBeingDefined(bool V = true) { TagDeclBits.IsBeingDefined = V; }

/// Indicates whether it is possible for declarations of this kind
/// to have an out-of-date definition.
///
/// This option is only enabled when modules are enabled.
void setMayHaveOutOfDateDef(bool V = true) {
  TagDeclBits.MayHaveOutOfDateDef = V;
}

3321public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

SourceRange getBraceRange() const { return BraceRange; }
void setBraceRange(SourceRange R) { BraceRange = R; }

/// Return SourceLocation representing start of source
/// range ignoring outer template declarations.
SourceLocation getInnerLocStart() const { return getBeginLoc(); }

/// Return SourceLocation representing start of source
/// range taking into account any outer template declarations.
SourceLocation getOuterLocStart() const;
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

TagDecl *getCanonicalDecl() override;
const TagDecl *getCanonicalDecl() const {
  return const_cast<TagDecl*>(this)->getCanonicalDecl();
}

/// Return true if this declaration is a completion definition of the type.
/// Provided for consistency.
bool isThisDeclarationADefinition() const {
  return isCompleteDefinition();
}

/// Return true if this decl has its body fully specified.
bool isCompleteDefinition() const { return TagDeclBits.IsCompleteDefinition; }

/// True if this decl has its body fully specified.
void setCompleteDefinition(bool V = true) {
  TagDeclBits.IsCompleteDefinition = V;
}

/// Return true if this complete decl is
/// required to be complete for some existing use.
bool isCompleteDefinitionRequired() const {
  return TagDeclBits.IsCompleteDefinitionRequired;
}

/// True if this complete decl is
/// required to be complete for some existing use.
void setCompleteDefinitionRequired(bool V = true) {
  TagDeclBits.IsCompleteDefinitionRequired = V;
}

/// Return true if this decl is currently being defined.
bool isBeingDefined() const { return TagDeclBits.IsBeingDefined; }

/// True if this tag declaration is "embedded" (i.e., defined or declared
/// for the very first time) in the syntax of a declarator.
bool isEmbeddedInDeclarator() const {
  return TagDeclBits.IsEmbeddedInDeclarator;
}

/// True if this tag declaration is "embedded" (i.e., defined or declared
/// for the very first time) in the syntax of a declarator.
void setEmbeddedInDeclarator(bool isInDeclarator) {
  TagDeclBits.IsEmbeddedInDeclarator = isInDeclarator;
}

/// True if this tag is free standing, e.g. "struct foo;".
bool isFreeStanding() const { return TagDeclBits.IsFreeStanding; }

/// True if this tag is free standing, e.g. "struct foo;".
void setFreeStanding(bool isFreeStanding = true) {
  TagDeclBits.IsFreeStanding = isFreeStanding;
}

/// Indicates whether it is possible for declarations of this kind
/// to have an out-of-date definition.
///
/// This option is only enabled when modules are enabled.
bool mayHaveOutOfDateDef() const { return TagDeclBits.MayHaveOutOfDateDef; }

/// Whether this declaration declares a type that is
/// dependent, i.e., a type that somehow depends on template
/// parameters.
bool isDependentType() const { return isDependentContext(); }

/// Starts the definition of this tag declaration.
///
/// This method should be invoked at the beginning of the definition
/// of this tag declaration. It will set the tag type into a state
/// where it is in the process of being defined.
void startDefinition();

/// Returns the TagDecl that actually defines this
///  struct/union/class/enum.  When determining whether or not a
///  struct/union/class/enum has a definition, one should use this
///  method as opposed to 'isDefinition'.  'isDefinition' indicates
///  whether or not a specific TagDecl is defining declaration, not
///  whether or not the struct/union/class/enum type is defined.
///  This method returns NULL if there is no TagDecl that defines
///  the struct/union/class/enum.
TagDecl *getDefinition() const;

StringRef getKindName() const {
  return TypeWithKeyword::getTagTypeKindName(getTagKind());
}

TagKind getTagKind() const {
  return static_cast<TagKind>(TagDeclBits.TagDeclKind);
}

void setTagKind(TagKind TK) { TagDeclBits.TagDeclKind = TK; }

bool isStruct() const { return getTagKind() == TTK_Struct; }
bool isInterface() const { return getTagKind() == TTK_Interface; }
bool isClass()  const { return getTagKind() == TTK_Class; }
bool isUnion()  const { return getTagKind() == TTK_Union; }
bool isEnum()   const { return getTagKind() == TTK_Enum; }

/// Is this tag type named, either directly or via being defined in
/// a typedef of this type?
///
/// C++11 [basic.link]p8:
///   A type is said to have linkage if and only if:
///     - it is a class or enumeration type that is named (or has a
///       name for linkage purposes) and the name has linkage; ...
/// C++11 [dcl.typedef]p9:
///   If the typedef declaration defines an unnamed class (or enum),
///   the first typedef-name declared by the declaration to be that
///   class type (or enum type) is used to denote the class type (or
///   enum type) for linkage purposes only.
///
/// C does not have an analogous rule, but the same concept is
/// nonetheless useful in some places.
bool hasNameForLinkage() const {
  return (getDeclName() || getTypedefNameForAnonDecl());
}

TypedefNameDecl *getTypedefNameForAnonDecl() const {
  return hasExtInfo() ? nullptr
                      : TypedefNameDeclOrQualifier.get<TypedefNameDecl *>();
}

void setTypedefNameForAnonDecl(TypedefNameDecl *TDD);

/// Retrieve the nested-name-specifier that qualifies the name of this
/// declaration, if it was present in the source.
NestedNameSpecifier *getQualifier() const {
  return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier()
                      : nullptr;
}

/// Retrieve the nested-name-specifier (with source-location
/// information) that qualifies the name of this declaration, if it was
/// present in the source.
NestedNameSpecifierLoc getQualifierLoc() const {
  return hasExtInfo() ? getExtInfo()->QualifierLoc
                      : NestedNameSpecifierLoc();
}

void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc);

unsigned getNumTemplateParameterLists() const {
  return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0;
}

TemplateParameterList *getTemplateParameterList(unsigned i) const {
  assert(i < getNumTemplateParameterLists())((i < getNumTemplateParameterLists()) ? static_cast<void
> (0) : __assert_fail ("i < getNumTemplateParameterLists()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 3493, __PRETTY_FUNCTION__));
  return getExtInfo()->TemplParamLists[i];
}

void setTemplateParameterListsInfo(ASTContext &Context,
                                   ArrayRef<TemplateParameterList *> TPLists);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstTag && K <= lastTag; }

static DeclContext *castToDeclContext(const TagDecl *D) {
  return static_cast<DeclContext *>(const_cast<TagDecl*>(D));
}

static TagDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<TagDecl *>(const_cast<DeclContext*>(DC));
}
3511};

3513/// Represents an enum.  In C++11, enums can be forward-declared
3514/// with a fixed underlying type, and in C we allow them to be forward-declared
3515/// with no underlying type as an extension.
3516class EnumDecl : public TagDecl {
// This class stores some data in DeclContext::EnumDeclBits
// to save some space. Use the provided accessors to access it.

/// This represent the integer type that the enum corresponds
/// to for code generation purposes.  Note that the enumerator constants may
/// have a different type than this does.
///
/// If the underlying integer type was explicitly stated in the source
/// code, this is a TypeSourceInfo* for that type. Otherwise this type
/// was automatically deduced somehow, and this is a Type*.
///
/// Normally if IsFixed(), this would contain a TypeSourceInfo*, but in
/// some cases it won't.
///
/// The underlying type of an enumeration never has any qualifiers, so
/// we can get away with just storing a raw Type*, and thus save an
/// extra pointer when TypeSourceInfo is needed.
llvm::PointerUnion<const Type *, TypeSourceInfo *> IntegerType;

/// The integer type that values of this type should
/// promote to.  In C, enumerators are generally of an integer type
/// directly, but gcc-style large enumerators (and all enumerators
/// in C++) are of the enum type instead.
QualType PromotionType;

/// If this enumeration is an instantiation of a member enumeration
/// of a class template specialization, this is the member specialization
/// information.
MemberSpecializationInfo *SpecializationInfo = nullptr;

/// Store the ODRHash after first calculation.
/// The corresponding flag HasODRHash is in EnumDeclBits
/// and can be accessed with the provided accessors.
unsigned ODRHash;

EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
         SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
         bool Scoped, bool ScopedUsingClassTag, bool Fixed);

void anchor() override;

void setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
                                  TemplateSpecializationKind TSK);

/// Sets the width in bits required to store all the
/// non-negative enumerators of this enum.
void setNumPositiveBits(unsigned Num) {
  EnumDeclBits.NumPositiveBits = Num;
  assert(EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount")((EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount"
) ? static_cast<void> (0) : __assert_fail ("EnumDeclBits.NumPositiveBits == Num && \"can't store this bitcount\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 3565, __PRETTY_FUNCTION__));
}

/// Returns the width in bits required to store all the
/// negative enumerators of this enum. (see getNumNegativeBits)
void setNumNegativeBits(unsigned Num) { EnumDeclBits.NumNegativeBits = Num; }

3572public:
/// True if this tag declaration is a scoped enumeration. Only
/// possible in C++11 mode.
void setScoped(bool Scoped = true) { EnumDeclBits.IsScoped = Scoped; }

/// If this tag declaration is a scoped enum,
/// then this is true if the scoped enum was declared using the class
/// tag, false if it was declared with the struct tag. No meaning is
/// associated if this tag declaration is not a scoped enum.
void setScopedUsingClassTag(bool ScopedUCT = true) {
  EnumDeclBits.IsScopedUsingClassTag = ScopedUCT;
}

/// True if this is an Objective-C, C++11, or
/// Microsoft-style enumeration with a fixed underlying type.
void setFixed(bool Fixed = true) { EnumDeclBits.IsFixed = Fixed; }

3589private:
/// True if a valid hash is stored in ODRHash.
bool hasODRHash() const { return EnumDeclBits.HasODRHash; }
void setHasODRHash(bool Hash = true) { EnumDeclBits.HasODRHash = Hash; }

3594public:
friend class ASTDeclReader;

EnumDecl *getCanonicalDecl() override {
  return cast<EnumDecl>(TagDecl::getCanonicalDecl());
}
const EnumDecl *getCanonicalDecl() const {
  return const_cast<EnumDecl*>(this)->getCanonicalDecl();
}

EnumDecl *getPreviousDecl() {
  return cast_or_null<EnumDecl>(
          static_cast<TagDecl *>(this)->getPreviousDecl());
}
const EnumDecl *getPreviousDecl() const {
  return const_cast<EnumDecl*>(this)->getPreviousDecl();
}

EnumDecl *getMostRecentDecl() {
  return cast<EnumDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl());
}
const EnumDecl *getMostRecentDecl() const {
  return const_cast<EnumDecl*>(this)->getMostRecentDecl();
}

EnumDecl *getDefinition() const {
  return cast_or_null<EnumDecl>(TagDecl::getDefinition());
}

static EnumDecl *Create(ASTContext &C, DeclContext *DC,
                        SourceLocation StartLoc, SourceLocation IdLoc,
                        IdentifierInfo *Id, EnumDecl *PrevDecl,
                        bool IsScoped, bool IsScopedUsingClassTag,
                        bool IsFixed);
static EnumDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// When created, the EnumDecl corresponds to a
/// forward-declared enum. This method is used to mark the
/// declaration as being defined; its enumerators have already been
/// added (via DeclContext::addDecl). NewType is the new underlying
/// type of the enumeration type.
void completeDefinition(QualType NewType,
                        QualType PromotionType,
                        unsigned NumPositiveBits,
                        unsigned NumNegativeBits);

// Iterates through the enumerators of this enumeration.
using enumerator_iterator = specific_decl_iterator<EnumConstantDecl>;
using enumerator_range =
    llvm::iterator_range<specific_decl_iterator<EnumConstantDecl>>;

enumerator_range enumerators() const {
  return enumerator_range(enumerator_begin(), enumerator_end());
}

enumerator_iterator enumerator_begin() const {
  const EnumDecl *E = getDefinition();
  if (!E)
    E = this;
  return enumerator_iterator(E->decls_begin());
}

enumerator_iterator enumerator_end() const {
  const EnumDecl *E = getDefinition();
  if (!E)
    E = this;
  return enumerator_iterator(E->decls_end());
}

/// Return the integer type that enumerators should promote to.
QualType getPromotionType() const { return PromotionType; }

/// Set the promotion type.
void setPromotionType(QualType T) { PromotionType = T; }

/// Return the integer type this enum decl corresponds to.
/// This returns a null QualType for an enum forward definition with no fixed
/// underlying type.
QualType getIntegerType() const {
  if (!IntegerType)
    return QualType();
  if (const Type *T = IntegerType.dyn_cast<const Type*>())
    return QualType(T, 0);
  return IntegerType.get<TypeSourceInfo*>()->getType().getUnqualifiedType();
}

/// Set the underlying integer type.
void setIntegerType(QualType T) { IntegerType = T.getTypePtrOrNull(); }

/// Set the underlying integer type source info.
void setIntegerTypeSourceInfo(TypeSourceInfo *TInfo) { IntegerType = TInfo; }

/// Return the type source info for the underlying integer type,
/// if no type source info exists, return 0.
TypeSourceInfo *getIntegerTypeSourceInfo() const {
  return IntegerType.dyn_cast<TypeSourceInfo*>();
}

/// Retrieve the source range that covers the underlying type if
/// specified.
SourceRange getIntegerTypeRange() const LLVM_READONLY__attribute__((__pure__));

/// Returns the width in bits required to store all the
/// non-negative enumerators of this enum.
unsigned getNumPositiveBits() const { return EnumDeclBits.NumPositiveBits; }

/// Returns the width in bits required to store all the
/// negative enumerators of this enum.  These widths include
/// the rightmost leading 1;  that is:
///
/// MOST NEGATIVE ENUMERATOR     PATTERN     NUM NEGATIVE BITS
/// ------------------------     -------     -----------------
///                       -1     1111111                     1
///                      -10     1110110                     5
///                     -101     1001011                     8
unsigned getNumNegativeBits() const { return EnumDeclBits.NumNegativeBits; }

/// Returns true if this is a C++11 scoped enumeration.
bool isScoped() const { return EnumDeclBits.IsScoped; }

/// Returns true if this is a C++11 scoped enumeration.
bool isScopedUsingClassTag() const {
  return EnumDeclBits.IsScopedUsingClassTag;
}

/// Returns true if this is an Objective-C, C++11, or
/// Microsoft-style enumeration with a fixed underlying type.
bool isFixed() const { return EnumDeclBits.IsFixed; }

unsigned getODRHash();

/// Returns true if this can be considered a complete type.
bool isComplete() const {
  // IntegerType is set for fixed type enums and non-fixed but implicitly
  // int-sized Microsoft enums.
  return isCompleteDefinition() || IntegerType;
}

/// Returns true if this enum is either annotated with
/// enum_extensibility(closed) or isn't annotated with enum_extensibility.
bool isClosed() const;

/// Returns true if this enum is annotated with flag_enum and isn't annotated
/// with enum_extensibility(open).
bool isClosedFlag() const;

/// Returns true if this enum is annotated with neither flag_enum nor
/// enum_extensibility(open).
bool isClosedNonFlag() const;

/// Retrieve the enum definition from which this enumeration could
/// be instantiated, if it is an instantiation (rather than a non-template).
EnumDecl *getTemplateInstantiationPattern() const;

/// Returns the enumeration (declared within the template)
/// from which this enumeration type was instantiated, or NULL if
/// this enumeration was not instantiated from any template.
EnumDecl *getInstantiatedFromMemberEnum() const;

/// If this enumeration is a member of a specialization of a
/// templated class, determine what kind of template specialization
/// or instantiation this is.
TemplateSpecializationKind getTemplateSpecializationKind() const;

/// For an enumeration member that was instantiated from a member
/// enumeration of a templated class, set the template specialiation kind.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                      SourceLocation PointOfInstantiation = SourceLocation());

/// If this enumeration is an instantiation of a member enumeration of
/// a class template specialization, retrieves the member specialization
/// information.
MemberSpecializationInfo *getMemberSpecializationInfo() const {
  return SpecializationInfo;
}

/// Specify that this enumeration is an instantiation of the
/// member enumeration ED.
void setInstantiationOfMemberEnum(EnumDecl *ED,
                                  TemplateSpecializationKind TSK) {
  setInstantiationOfMemberEnum(getASTContext(), ED, TSK);
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Enum; }
3779};

3781/// Represents a struct/union/class.  For example:
3782///   struct X;                  // Forward declaration, no "body".
3783///   union Y { int A, B; };     // Has body with members A and B (FieldDecls).
3784/// This decl will be marked invalid if *any* members are invalid.
3785class RecordDecl : public TagDecl {
// This class stores some data in DeclContext::RecordDeclBits
// to save some space. Use the provided accessors to access it.
3788public:
friend class DeclContext;
/// Enum that represents the different ways arguments are passed to and
/// returned from function calls. This takes into account the target-specific
/// and version-specific rules along with the rules determined by the
/// language.
enum ArgPassingKind : unsigned {
  /// The argument of this type can be passed directly in registers.
  APK_CanPassInRegs,

  /// The argument of this type cannot be passed directly in registers.
  /// Records containing this type as a subobject are not forced to be passed
  /// indirectly. This value is used only in C++. This value is required by
  /// C++ because, in uncommon situations, it is possible for a class to have
  /// only trivial copy/move constructors even when one of its subobjects has
  /// a non-trivial copy/move constructor (if e.g. the corresponding copy/move
  /// constructor in the derived class is deleted).
  APK_CannotPassInRegs,

  /// The argument of this type cannot be passed directly in registers.
  /// Records containing this type as a subobject are forced to be passed
  /// indirectly.
  APK_CanNeverPassInRegs
};

3813protected:
RecordDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
           SourceLocation StartLoc, SourceLocation IdLoc,
           IdentifierInfo *Id, RecordDecl *PrevDecl);

3818public:
static RecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC,
                          SourceLocation StartLoc, SourceLocation IdLoc,
                          IdentifierInfo *Id, RecordDecl* PrevDecl = nullptr);
static RecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID);

RecordDecl *getPreviousDecl() {
  return cast_or_null<RecordDecl>(
          static_cast<TagDecl *>(this)->getPreviousDecl());
}
const RecordDecl *getPreviousDecl() const {
  return const_cast<RecordDecl*>(this)->getPreviousDecl();
}

RecordDecl *getMostRecentDecl() {
  return cast<RecordDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl());
}
const RecordDecl *getMostRecentDecl() const {
  return const_cast<RecordDecl*>(this)->getMostRecentDecl();
}

bool hasFlexibleArrayMember() const {
  return RecordDeclBits.HasFlexibleArrayMember;
}

void setHasFlexibleArrayMember(bool V) {
  RecordDeclBits.HasFlexibleArrayMember = V;
}

/// Whether this is an anonymous struct or union. To be an anonymous
/// struct or union, it must have been declared without a name and
/// there must be no objects of this type declared, e.g.,
/// @code
///   union { int i; float f; };
/// @endcode
/// is an anonymous union but neither of the following are:
/// @code
///  union X { int i; float f; };
///  union { int i; float f; } obj;
/// @endcode
bool isAnonymousStructOrUnion() const {
  return RecordDeclBits.AnonymousStructOrUnion;
}

void setAnonymousStructOrUnion(bool Anon) {
  RecordDeclBits.AnonymousStructOrUnion = Anon;
}

bool hasObjectMember() const { return RecordDeclBits.HasObjectMember; }
void setHasObjectMember(bool val) { RecordDeclBits.HasObjectMember = val; }

bool hasVolatileMember() const { return RecordDeclBits.HasVolatileMember; }

void setHasVolatileMember(bool val) {
  RecordDeclBits.HasVolatileMember = val;
}

bool hasLoadedFieldsFromExternalStorage() const {
  return RecordDeclBits.LoadedFieldsFromExternalStorage;
}

void setHasLoadedFieldsFromExternalStorage(bool val) const {
  RecordDeclBits.LoadedFieldsFromExternalStorage = val;
}

/// Functions to query basic properties of non-trivial C structs.
bool isNonTrivialToPrimitiveDefaultInitialize() const {
  return RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize;
}

void setNonTrivialToPrimitiveDefaultInitialize(bool V) {
  RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize = V;
}

bool isNonTrivialToPrimitiveCopy() const {
  return RecordDeclBits.NonTrivialToPrimitiveCopy;
}

void setNonTrivialToPrimitiveCopy(bool V) {
  RecordDeclBits.NonTrivialToPrimitiveCopy = V;
}

bool isNonTrivialToPrimitiveDestroy() const {
  return RecordDeclBits.NonTrivialToPrimitiveDestroy;
}

void setNonTrivialToPrimitiveDestroy(bool V) {
  RecordDeclBits.NonTrivialToPrimitiveDestroy = V;
}

bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const {
  return RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion;
}

void setHasNonTrivialToPrimitiveDefaultInitializeCUnion(bool V) {
  RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion = V;
}

bool hasNonTrivialToPrimitiveDestructCUnion() const {
  return RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion;
}

void setHasNonTrivialToPrimitiveDestructCUnion(bool V) {
  RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion = V;
}

bool hasNonTrivialToPrimitiveCopyCUnion() const {
  return RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion;
}

void setHasNonTrivialToPrimitiveCopyCUnion(bool V) {
  RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion = V;
}

/// Determine whether this class can be passed in registers. In C++ mode,
/// it must have at least one trivial, non-deleted copy or move constructor.
/// FIXME: This should be set as part of completeDefinition.
bool canPassInRegisters() const {
  return getArgPassingRestrictions() == APK_CanPassInRegs;
}

ArgPassingKind getArgPassingRestrictions() const {
  return static_cast<ArgPassingKind>(RecordDeclBits.ArgPassingRestrictions);
}

void setArgPassingRestrictions(ArgPassingKind Kind) {
  RecordDeclBits.ArgPassingRestrictions = Kind;
}

bool isParamDestroyedInCallee() const {
  return RecordDeclBits.ParamDestroyedInCallee;
}

void setParamDestroyedInCallee(bool V) {
  RecordDeclBits.ParamDestroyedInCallee = V;
}

/// Determines whether this declaration represents the
/// injected class name.
///
/// The injected class name in C++ is the name of the class that
/// appears inside the class itself. For example:
///
/// \code
/// struct C {
///   // C is implicitly declared here as a synonym for the class name.
/// };
///
/// C::C c; // same as "C c;"
/// \endcode
bool isInjectedClassName() const;

/// Determine whether this record is a class describing a lambda
/// function object.
bool isLambda() const;

/// Determine whether this record is a record for captured variables in
/// CapturedStmt construct.
bool isCapturedRecord() const;

/// Mark the record as a record for captured variables in CapturedStmt
/// construct.
void setCapturedRecord();

/// Returns the RecordDecl that actually defines
///  this struct/union/class.  When determining whether or not a
///  struct/union/class is completely defined, one should use this
///  method as opposed to 'isCompleteDefinition'.
///  'isCompleteDefinition' indicates whether or not a specific
///  RecordDecl is a completed definition, not whether or not the
///  record type is defined.  This method returns NULL if there is
///  no RecordDecl that defines the struct/union/tag.
RecordDecl *getDefinition() const {
  return cast_or_null<RecordDecl>(TagDecl::getDefinition());
}

/// Returns whether this record is a union, or contains (at any nesting level)
/// a union member. This is used by CMSE to warn about possible information
/// leaks.
bool isOrContainsUnion() const;

// Iterator access to field members. The field iterator only visits
// the non-static data members of this class, ignoring any static
// data members, functions, constructors, destructors, etc.
using field_iterator = specific_decl_iterator<FieldDecl>;
using field_range = llvm::iterator_range<specific_decl_iterator<FieldDecl>>;

field_range fields() const { return field_range(field_begin(), field_end()); }
field_iterator field_begin() const;

field_iterator field_end() const {
  return field_iterator(decl_iterator());
}

// Whether there are any fields (non-static data members) in this record.
bool field_empty() const {
  return field_begin() == field_end();
}

/// Note that the definition of this type is now complete.
virtual void completeDefinition();

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstRecord && K <= lastRecord;
}

/// Get whether or not this is an ms_struct which can
/// be turned on with an attribute, pragma, or -mms-bitfields
/// commandline option.
bool isMsStruct(const ASTContext &C) const;

/// Whether we are allowed to insert extra padding between fields.
/// These padding are added to help AddressSanitizer detect
/// intra-object-overflow bugs.
bool mayInsertExtraPadding(bool EmitRemark = false) const;

/// Finds the first data member which has a name.
/// nullptr is returned if no named data member exists.
const FieldDecl *findFirstNamedDataMember() const;

4039private:
/// Deserialize just the fields.
void LoadFieldsFromExternalStorage() const;
4042};

4044class FileScopeAsmDecl : public Decl {
StringLiteral *AsmString;
SourceLocation RParenLoc;

FileScopeAsmDecl(DeclContext *DC, StringLiteral *asmstring,
                 SourceLocation StartL, SourceLocation EndL)
  : Decl(FileScopeAsm, DC, StartL), AsmString(asmstring), RParenLoc(EndL) {}

virtual void anchor();

4054public:
static FileScopeAsmDecl *Create(ASTContext &C, DeclContext *DC,
                                StringLiteral *Str, SourceLocation AsmLoc,
                                SourceLocation RParenLoc);

static FileScopeAsmDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceLocation getAsmLoc() const { return getLocation(); }
SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(getAsmLoc(), getRParenLoc());
}

const StringLiteral *getAsmString() const { return AsmString; }
StringLiteral *getAsmString() { return AsmString; }
void setAsmString(StringLiteral *Asm) { AsmString = Asm; }

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == FileScopeAsm; }
4074};

4076/// Represents a block literal declaration, which is like an
4077/// unnamed FunctionDecl.  For example:
4078/// ^{ statement-body }   or   ^(int arg1, float arg2){ statement-body }
4079class BlockDecl : public Decl, public DeclContext {
// This class stores some data in DeclContext::BlockDeclBits
// to save some space. Use the provided accessors to access it.
4082public:
/// A class which contains all the information about a particular
/// captured value.
class Capture {
  enum {
    flag_isByRef = 0x1,
    flag_isNested = 0x2
  };

  /// The variable being captured.
  llvm::PointerIntPair<VarDecl*, 2> VariableAndFlags;

  /// The copy expression, expressed in terms of a DeclRef (or
  /// BlockDeclRef) to the captured variable.  Only required if the
  /// variable has a C++ class type.
  Expr *CopyExpr;

public:
  Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy)
    : VariableAndFlags(variable,
                (byRef ? flag_isByRef : 0) | (nested ? flag_isNested : 0)),
      CopyExpr(copy) {}

  /// The variable being captured.
  VarDecl *getVariable() const { return VariableAndFlags.getPointer(); }

  /// Whether this is a "by ref" capture, i.e. a capture of a __block
  /// variable.
  bool isByRef() const { return VariableAndFlags.getInt() & flag_isByRef; }

  bool isEscapingByref() const {
    return getVariable()->isEscapingByref();
  }

  bool isNonEscapingByref() const {
    return getVariable()->isNonEscapingByref();
  }

  /// Whether this is a nested capture, i.e. the variable captured
  /// is not from outside the immediately enclosing function/block.
  bool isNested() const { return VariableAndFlags.getInt() & flag_isNested; }

  bool hasCopyExpr() const { return CopyExpr != nullptr; }
  Expr *getCopyExpr() const { return CopyExpr; }
  void setCopyExpr(Expr *e) { CopyExpr = e; }
};

4129private:
/// A new[]'d array of pointers to ParmVarDecls for the formal
/// parameters of this function.  This is null if a prototype or if there are
/// no formals.
ParmVarDecl **ParamInfo = nullptr;
unsigned NumParams = 0;

Stmt *Body = nullptr;
TypeSourceInfo *SignatureAsWritten = nullptr;

const Capture *Captures = nullptr;
unsigned NumCaptures = 0;

unsigned ManglingNumber = 0;
Decl *ManglingContextDecl = nullptr;

4145protected:
BlockDecl(DeclContext *DC, SourceLocation CaretLoc);

4148public:
static BlockDecl *Create(ASTContext &C, DeclContext *DC, SourceLocation L);
static BlockDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceLocation getCaretLocation() const { return getLocation(); }

bool isVariadic() const { return BlockDeclBits.IsVariadic; }
void setIsVariadic(bool value) { BlockDeclBits.IsVariadic = value; }

CompoundStmt *getCompoundBody() const { return (CompoundStmt*) Body; }
Stmt *getBody() const override { return (Stmt*) Body; }
void setBody(CompoundStmt *B) { Body = (Stmt*) B; }

void setSignatureAsWritten(TypeSourceInfo *Sig) { SignatureAsWritten = Sig; }
TypeSourceInfo *getSignatureAsWritten() const { return SignatureAsWritten; }

// ArrayRef access to formal parameters.
ArrayRef<ParmVarDecl *> parameters() const {
  return {ParamInfo, getNumParams()};
}
MutableArrayRef<ParmVarDecl *> parameters() {
  return {ParamInfo, getNumParams()};
}

// Iterator access to formal parameters.
using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator;
using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator;

bool param_empty() const { return parameters().empty(); }
param_iterator param_begin() { return parameters().begin(); }
param_iterator param_end() { return parameters().end(); }
param_const_iterator param_begin() const { return parameters().begin(); }
param_const_iterator param_end() const { return parameters().end(); }
size_t param_size() const { return parameters().size(); }

unsigned getNumParams() const { return NumParams; }

const ParmVarDecl *getParamDecl(unsigned i) const {
  assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast
<void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4186, __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
ParmVarDecl *getParamDecl(unsigned i) {
  assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast
<void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4190, __PRETTY_FUNCTION__));
  return ParamInfo[i];
}

void setParams(ArrayRef<ParmVarDecl *> NewParamInfo);

/// True if this block (or its nested blocks) captures
/// anything of local storage from its enclosing scopes.
bool hasCaptures() const { return NumCaptures || capturesCXXThis(); }

/// Returns the number of captured variables.
/// Does not include an entry for 'this'.
unsigned getNumCaptures() const { return NumCaptures; }

using capture_const_iterator = ArrayRef<Capture>::const_iterator;

ArrayRef<Capture> captures() const { return {Captures, NumCaptures}; }

capture_const_iterator capture_begin() const { return captures().begin(); }
capture_const_iterator capture_end() const { return captures().end(); }

bool capturesCXXThis() const { return BlockDeclBits.CapturesCXXThis; }
void setCapturesCXXThis(bool B = true) { BlockDeclBits.CapturesCXXThis = B; }

bool blockMissingReturnType() const {
  return BlockDeclBits.BlockMissingReturnType;
}

void setBlockMissingReturnType(bool val = true) {
  BlockDeclBits.BlockMissingReturnType = val;
}

bool isConversionFromLambda() const {
  return BlockDeclBits.IsConversionFromLambda;
}

void setIsConversionFromLambda(bool val = true) {
  BlockDeclBits.IsConversionFromLambda = val;
}

bool doesNotEscape() const { return BlockDeclBits.DoesNotEscape; }
void setDoesNotEscape(bool B = true) { BlockDeclBits.DoesNotEscape = B; }

bool canAvoidCopyToHeap() const {
  return BlockDeclBits.CanAvoidCopyToHeap;
}
void setCanAvoidCopyToHeap(bool B = true) {
  BlockDeclBits.CanAvoidCopyToHeap = B;
}

bool capturesVariable(const VarDecl *var) const;

void setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
                 bool CapturesCXXThis);

unsigned getBlockManglingNumber() const { return ManglingNumber; }

Decl *getBlockManglingContextDecl() const { return ManglingContextDecl; }

void setBlockMangling(unsigned Number, Decl *Ctx) {
  ManglingNumber = Number;
  ManglingContextDecl = Ctx;
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Block; }
static DeclContext *castToDeclContext(const BlockDecl *D) {
  return static_cast<DeclContext *>(const_cast<BlockDecl*>(D));
}
static BlockDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<BlockDecl *>(const_cast<DeclContext*>(DC));
}
4265};

4267/// Represents the body of a CapturedStmt, and serves as its DeclContext.
4268class CapturedDecl final
  : public Decl,
    public DeclContext,
    private llvm::TrailingObjects<CapturedDecl, ImplicitParamDecl *> {
4272protected:
size_t numTrailingObjects(OverloadToken<ImplicitParamDecl>) {
  return NumParams;
}

4277private:
/// The number of parameters to the outlined function.
unsigned NumParams;

/// The position of context parameter in list of parameters.
unsigned ContextParam;

/// The body of the outlined function.
llvm::PointerIntPair<Stmt *, 1, bool> BodyAndNothrow;

explicit CapturedDecl(DeclContext *DC, unsigned NumParams);

ImplicitParamDecl *const *getParams() const {
  return getTrailingObjects<ImplicitParamDecl *>();
}

ImplicitParamDecl **getParams() {
  return getTrailingObjects<ImplicitParamDecl *>();
}

4297public:
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

static CapturedDecl *Create(ASTContext &C, DeclContext *DC,
                            unsigned NumParams);
static CapturedDecl *CreateDeserialized(ASTContext &C, unsigned ID,
                                        unsigned NumParams);

Stmt *getBody() const override;
void setBody(Stmt *B);

bool isNothrow() const;
void setNothrow(bool Nothrow = true);

unsigned getNumParams() const { return NumParams; }

ImplicitParamDecl *getParam(unsigned i) const {
  assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4316, __PRETTY_FUNCTION__));
  return getParams()[i];
}
void setParam(unsigned i, ImplicitParamDecl *P) {
  assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4320, __PRETTY_FUNCTION__));
  getParams()[i] = P;
}

// ArrayRef interface to parameters.
ArrayRef<ImplicitParamDecl *> parameters() const {
  return {getParams(), getNumParams()};
}
MutableArrayRef<ImplicitParamDecl *> parameters() {
  return {getParams(), getNumParams()};
}

/// Retrieve the parameter containing captured variables.
ImplicitParamDecl *getContextParam() const {
  assert(ContextParam < NumParams)((ContextParam < NumParams) ? static_cast<void> (0) :
 __assert_fail ("ContextParam < NumParams", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4334, __PRETTY_FUNCTION__));
  return getParam(ContextParam);
}
void setContextParam(unsigned i, ImplicitParamDecl *P) {
  assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4338, __PRETTY_FUNCTION__));
  ContextParam = i;
  setParam(i, P);
}
unsigned getContextParamPosition() const { return ContextParam; }

using param_iterator = ImplicitParamDecl *const *;
using param_range = llvm::iterator_range<param_iterator>;

/// Retrieve an iterator pointing to the first parameter decl.
param_iterator param_begin() const { return getParams(); }
/// Retrieve an iterator one past the last parameter decl.
param_iterator param_end() const { return getParams() + NumParams; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Captured; }
static DeclContext *castToDeclContext(const CapturedDecl *D) {
  return static_cast<DeclContext *>(const_cast<CapturedDecl *>(D));
}
static CapturedDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<CapturedDecl *>(const_cast<DeclContext *>(DC));
}
4361};

4363/// Describes a module import declaration, which makes the contents
4364/// of the named module visible in the current translation unit.
4365///
4366/// An import declaration imports the named module (or submodule). For example:
4367/// \code
4368///   @import std.vector;
4369/// \endcode
4370///
4371/// Import declarations can also be implicitly generated from
4372/// \#include/\#import directives.
4373class ImportDecl final : public Decl,
                       llvm::TrailingObjects<ImportDecl, SourceLocation> {
friend class ASTContext;
friend class ASTDeclReader;
friend class ASTReader;
friend TrailingObjects;

/// The imported module.
Module *ImportedModule = nullptr;

/// The next import in the list of imports local to the translation
/// unit being parsed (not loaded from an AST file).
///
/// Includes a bit that indicates whether we have source-location information
/// for each identifier in the module name.
///
/// When the bit is false, we only have a single source location for the
/// end of the import declaration.
llvm::PointerIntPair<ImportDecl *, 1, bool> NextLocalImportAndComplete;

ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported,
           ArrayRef<SourceLocation> IdentifierLocs);

ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported,
           SourceLocation EndLoc);

ImportDecl(EmptyShell Empty) : Decl(Import, Empty) {}

bool isImportComplete() const { return NextLocalImportAndComplete.getInt(); }

void setImportComplete(bool C) { NextLocalImportAndComplete.setInt(C); }

/// The next import in the list of imports local to the translation
/// unit being parsed (not loaded from an AST file).
ImportDecl *getNextLocalImport() const {
  return NextLocalImportAndComplete.getPointer();
}

void setNextLocalImport(ImportDecl *Import) {
  NextLocalImportAndComplete.setPointer(Import);
}

4415public:
/// Create a new module import declaration.
static ImportDecl *Create(ASTContext &C, DeclContext *DC,
                          SourceLocation StartLoc, Module *Imported,
                          ArrayRef<SourceLocation> IdentifierLocs);

/// Create a new module import declaration for an implicitly-generated
/// import.
static ImportDecl *CreateImplicit(ASTContext &C, DeclContext *DC,
                                  SourceLocation StartLoc, Module *Imported,
                                  SourceLocation EndLoc);

/// Create a new, deserialized module import declaration.
static ImportDecl *CreateDeserialized(ASTContext &C, unsigned ID,
                                      unsigned NumLocations);

/// Retrieve the module that was imported by the import declaration.
Module *getImportedModule() const { return ImportedModule; }

/// Retrieves the locations of each of the identifiers that make up
/// the complete module name in the import declaration.
///
/// This will return an empty array if the locations of the individual
/// identifiers aren't available.
ArrayRef<SourceLocation> getIdentifierLocs() const;

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Import; }
4445};

4447/// Represents a C++ Modules TS module export declaration.
4448///
4449/// For example:
4450/// \code
4451///   export void foo();
4452/// \endcode
4453class ExportDecl final : public Decl, public DeclContext {
virtual void anchor();

4456private:
friend class ASTDeclReader;

/// The source location for the right brace (if valid).
SourceLocation RBraceLoc;

ExportDecl(DeclContext *DC, SourceLocation ExportLoc)
    : Decl(Export, DC, ExportLoc), DeclContext(Export),
      RBraceLoc(SourceLocation()) {}

4466public:
static ExportDecl *Create(ASTContext &C, DeclContext *DC,
                          SourceLocation ExportLoc);
static ExportDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceLocation getExportLoc() const { return getLocation(); }
SourceLocation getRBraceLoc() const { return RBraceLoc; }
void setRBraceLoc(SourceLocation L) { RBraceLoc = L; }

bool hasBraces() const { return RBraceLoc.isValid(); }

SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) {
  if (hasBraces())
    return RBraceLoc;
  // No braces: get the end location of the (only) declaration in context
  // (if present).
  return decls_empty() ? getLocation() : decls_begin()->getEndLoc();
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(getLocation(), getEndLoc());
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Export; }
static DeclContext *castToDeclContext(const ExportDecl *D) {
  return static_cast<DeclContext *>(const_cast<ExportDecl*>(D));
}
static ExportDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<ExportDecl *>(const_cast<DeclContext*>(DC));
}
4497};

4499/// Represents an empty-declaration.
4500class EmptyDecl : public Decl {
EmptyDecl(DeclContext *DC, SourceLocation L) : Decl(Empty, DC, L) {}

virtual void anchor();

4505public:
static EmptyDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation L);
static EmptyDecl *CreateDeserialized(ASTContext &C, unsigned ID);

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Empty; }
4512};

4514/// Insertion operator for diagnostics.  This allows sending NamedDecl's
4515/// into a diagnostic with <<.
4516inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         const NamedDecl* ND) {
DB.AddTaggedVal(reinterpret_cast<intptr_t>(ND),
                DiagnosticsEngine::ak_nameddecl);
return DB;
4521}
4522inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                         const NamedDecl* ND) {
PD.AddTaggedVal(reinterpret_cast<intptr_t>(ND),
                DiagnosticsEngine::ak_nameddecl);
return PD;
4527}

4529template<typename decl_type>
4530void Redeclarable<decl_type>::setPreviousDecl(decl_type *PrevDecl) {
// Note: This routine is implemented here because we need both NamedDecl
// and Redeclarable to be defined.
assert(RedeclLink.isFirst() &&((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain"
) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4534, __PRETTY_FUNCTION__))
       "setPreviousDecl on a decl already in a redeclaration chain")((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain"
) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4534, __PRETTY_FUNCTION__));

if (PrevDecl) {
  // Point to previous. Make sure that this is actually the most recent
  // redeclaration, or we can build invalid chains. If the most recent
  // redeclaration is invalid, it won't be PrevDecl, but we want it anyway.
  First = PrevDecl->getFirstDecl();
  assert(First->RedeclLink.isFirst() && "Expected first")((First->RedeclLink.isFirst() && "Expected first")
 ? static_cast<void> (0) : __assert_fail ("First->RedeclLink.isFirst() && \"Expected first\""
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4541, __PRETTY_FUNCTION__));
  decl_type *MostRecent = First->getNextRedeclaration();
  RedeclLink = PreviousDeclLink(cast<decl_type>(MostRecent));

  // If the declaration was previously visible, a redeclaration of it remains
  // visible even if it wouldn't be visible by itself.
  static_cast<decl_type*>(this)->IdentifierNamespace |=
    MostRecent->getIdentifierNamespace() &
    (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type);
} else {
  // Make this first.
  First = static_cast<decl_type*>(this);
}

// First one will point to this one as latest.
First->RedeclLink.setLatest(static_cast<decl_type*>(this));

assert(!isa<NamedDecl>(static_cast<decl_type*>(this)) ||((!isa<NamedDecl>(static_cast<decl_type*>(this)) ||
 cast<NamedDecl>(static_cast<decl_type*>(this))->
isLinkageValid()) ? static_cast<void> (0) : __assert_fail
 ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4559, __PRETTY_FUNCTION__))
       cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid())((!isa<NamedDecl>(static_cast<decl_type*>(this)) ||
 cast<NamedDecl>(static_cast<decl_type*>(this))->
isLinkageValid()) ? static_cast<void> (0) : __assert_fail
 ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()"
, "/build/llvm-toolchain-snapshot-12~++20200927111121+5811d723998/clang/include/clang/AST/Decl.h"
, 4559, __PRETTY_FUNCTION__));
4560}

4562// Inline function definitions.

4564/// Check if the given decl is complete.
4565///
4566/// We use this function to break a cycle between the inline definitions in
4567/// Type.h and Decl.h.
4568inline bool IsEnumDeclComplete(EnumDecl *ED) {
return ED->isComplete();
4570}

4572/// Check if the given decl is scoped.
4573///
4574/// We use this function to break a cycle between the inline definitions in
4575/// Type.h and Decl.h.
4576inline bool IsEnumDeclScoped(EnumDecl *ED) {
return ED->isScoped();
4578}

4580/// OpenMP variants are mangled early based on their OpenMP context selector.
4581/// The new name looks likes this:
4582///  <name> + OpenMPVariantManglingSeparatorStr + <mangled OpenMP context>
4583static constexpr StringRef getOpenMPVariantManglingSeparatorStr() {
return "$ompvariant";
4585}

4587} // namespace clang

4589#endif // LLVM_CLANG_AST_DECL_H