/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST/Expr.cpp

Bug Summary

File:	clang/lib/AST/Expr.cpp
Warning:	line 315, column 5 Storage provided to placement new is only 0 bytes, whereas the allocated type requires 72 bytes

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 Expr.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 -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/include -D NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/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-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/AST -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e=. -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 -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-09-04-040900-46481-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST/Expr.cpp

/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/AST/Expr.cpp

→

1//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
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 class and subclasses.
10//
11//===----------------------------------------------------------------------===//

13#include "clang/AST/Expr.h"
14#include "clang/AST/APValue.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/Attr.h"
17#include "clang/AST/ComputeDependence.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/DependenceFlags.h"
22#include "clang/AST/EvaluatedExprVisitor.h"
23#include "clang/AST/ExprCXX.h"
24#include "clang/AST/IgnoreExpr.h"
25#include "clang/AST/Mangle.h"
26#include "clang/AST/RecordLayout.h"
27#include "clang/AST/StmtVisitor.h"
28#include "clang/Basic/Builtins.h"
29#include "clang/Basic/CharInfo.h"
30#include "clang/Basic/SourceManager.h"
31#include "clang/Basic/TargetInfo.h"
32#include "clang/Lex/Lexer.h"
33#include "clang/Lex/LiteralSupport.h"
34#include "llvm/Support/ErrorHandling.h"
35#include "llvm/Support/Format.h"
36#include "llvm/Support/raw_ostream.h"
37#include <algorithm>
38#include <cstring>
39using namespace clang;

41const Expr *Expr::getBestDynamicClassTypeExpr() const {
const Expr *E = this;
while (true) {
  E = E->IgnoreParenBaseCasts();

  // Follow the RHS of a comma operator.
  if (auto *BO = dyn_cast<BinaryOperator>(E)) {
    if (BO->getOpcode() == BO_Comma) {
      E = BO->getRHS();
      continue;
    }
  }

  // Step into initializer for materialized temporaries.
  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
    E = MTE->getSubExpr();
    continue;
  }

  break;
}

return E;
64}

66const CXXRecordDecl *Expr::getBestDynamicClassType() const {
const Expr *E = getBestDynamicClassTypeExpr();
QualType DerivedType = E->getType();
if (const PointerType *PTy = DerivedType->getAs<PointerType>())
  DerivedType = PTy->getPointeeType();

if (DerivedType->isDependentType())
  return nullptr;

const RecordType *Ty = DerivedType->castAs<RecordType>();
Decl *D = Ty->getDecl();
return cast<CXXRecordDecl>(D);
78}

80const Expr *Expr::skipRValueSubobjectAdjustments(
  SmallVectorImpl<const Expr *> &CommaLHSs,
  SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
const Expr *E = this;
while (true) {
  E = E->IgnoreParens();

  if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
    if ((CE->getCastKind() == CK_DerivedToBase ||
         CE->getCastKind() == CK_UncheckedDerivedToBase) &&
        E->getType()->isRecordType()) {
      E = CE->getSubExpr();
      auto *Derived =
          cast<CXXRecordDecl>(E->getType()->castAs<RecordType>()->getDecl());
      Adjustments.push_back(SubobjectAdjustment(CE, Derived));
      continue;
    }

    if (CE->getCastKind() == CK_NoOp) {
      E = CE->getSubExpr();
      continue;
    }
  } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
    if (!ME->isArrow()) {
      assert(ME->getBase()->getType()->isRecordType())(static_cast<void> (0));
      if (FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
        if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
          E = ME->getBase();
          Adjustments.push_back(SubobjectAdjustment(Field));
          continue;
        }
      }
    }
  } else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
    if (BO->getOpcode() == BO_PtrMemD) {
      assert(BO->getRHS()->isPRValue())(static_cast<void> (0));
      E = BO->getLHS();
      const MemberPointerType *MPT =
        BO->getRHS()->getType()->getAs<MemberPointerType>();
      Adjustments.push_back(SubobjectAdjustment(MPT, BO->getRHS()));
      continue;
    }
    if (BO->getOpcode() == BO_Comma) {
      CommaLHSs.push_back(BO->getLHS());
      E = BO->getRHS();
      continue;
    }
  }

  // Nothing changed.
  break;
}
return E;
133}

135bool Expr::isKnownToHaveBooleanValue(bool Semantic) const {
const Expr *E = IgnoreParens();

// If this value has _Bool type, it is obvious 0/1.
if (E->getType()->isBooleanType()) return true;
// If this is a non-scalar-integer type, we don't care enough to try.
if (!E->getType()->isIntegralOrEnumerationType()) return false;

if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
  switch (UO->getOpcode()) {
  case UO_Plus:
    return UO->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
  case UO_LNot:
    return true;
  default:
    return false;
  }
}

// Only look through implicit casts.  If the user writes
// '(int) (a && b)' treat it as an arbitrary int.
// FIXME: Should we look through any cast expression in !Semantic mode?
if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
  return CE->getSubExpr()->isKnownToHaveBooleanValue(Semantic);

if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
  switch (BO->getOpcode()) {
  default: return false;
  case BO_LT:   // Relational operators.
  case BO_GT:
  case BO_LE:
  case BO_GE:
  case BO_EQ:   // Equality operators.
  case BO_NE:
  case BO_LAnd: // AND operator.
  case BO_LOr:  // Logical OR operator.
    return true;

  case BO_And:  // Bitwise AND operator.
  case BO_Xor:  // Bitwise XOR operator.
  case BO_Or:   // Bitwise OR operator.
    // Handle things like (x==2)|(y==12).
    return BO->getLHS()->isKnownToHaveBooleanValue(Semantic) &&
           BO->getRHS()->isKnownToHaveBooleanValue(Semantic);

  case BO_Comma:
  case BO_Assign:
    return BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
  }
}

if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
  return CO->getTrueExpr()->isKnownToHaveBooleanValue(Semantic) &&
         CO->getFalseExpr()->isKnownToHaveBooleanValue(Semantic);

if (isa<ObjCBoolLiteralExpr>(E))
  return true;

if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
  return OVE->getSourceExpr()->isKnownToHaveBooleanValue(Semantic);

if (const FieldDecl *FD = E->getSourceBitField())
  if (!Semantic && FD->getType()->isUnsignedIntegerType() &&
      !FD->getBitWidth()->isValueDependent() &&
      FD->getBitWidthValue(FD->getASTContext()) == 1)
    return true;

return false;
203}

205// Amusing macro metaprogramming hack: check whether a class provides
206// a more specific implementation of getExprLoc().
207//
208// See also Stmt.cpp:{getBeginLoc(),getEndLoc()}.
209namespace {
/// This implementation is used when a class provides a custom
/// implementation of getExprLoc.
template <class E, class T>
SourceLocation getExprLocImpl(const Expr *expr,
                              SourceLocation (T::*v)() const) {
  return static_cast<const E*>(expr)->getExprLoc();
}

/// This implementation is used when a class doesn't provide
/// a custom implementation of getExprLoc.  Overload resolution
/// should pick it over the implementation above because it's
/// more specialized according to function template partial ordering.
template <class E>
SourceLocation getExprLocImpl(const Expr *expr,
                              SourceLocation (Expr::*v)() const) {
  return static_cast<const E *>(expr)->getBeginLoc();
}
227}

229SourceLocation Expr::getExprLoc() const {
switch (getStmtClass()) {
case Stmt::NoStmtClass: llvm_unreachable("statement without class")__builtin_unreachable();
232#define ABSTRACT_STMT(type)
233#define STMT(type, base) \
case Stmt::type##Class: break;
235#define EXPR(type, base) \
case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
237#include "clang/AST/StmtNodes.inc"
}
llvm_unreachable("unknown expression kind")__builtin_unreachable();
240}

242//===----------------------------------------------------------------------===//
243// Primary Expressions.
244//===----------------------------------------------------------------------===//

246static void AssertResultStorageKind(ConstantExpr::ResultStorageKind Kind) {
assert((Kind == ConstantExpr::RSK_APValue ||(static_cast<void> (0))
        Kind == ConstantExpr::RSK_Int64 || Kind == ConstantExpr::RSK_None) &&(static_cast<void> (0))
       "Invalid StorageKind Value")(static_cast<void> (0));
(void)Kind;
251}

253ConstantExpr::ResultStorageKind
254ConstantExpr::getStorageKind(const APValue &Value) {
switch (Value.getKind()) {
case APValue::None:
case APValue::Indeterminate:
  return ConstantExpr::RSK_None;
case APValue::Int:
  if (!Value.getInt().needsCleanup())
    return ConstantExpr::RSK_Int64;
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
default:
  return ConstantExpr::RSK_APValue;
}
266}

268ConstantExpr::ResultStorageKind
269ConstantExpr::getStorageKind(const Type *T, const ASTContext &Context) {
if (T->isIntegralOrEnumerationType() && Context.getTypeInfo(T).Width <= 64)
  return ConstantExpr::RSK_Int64;
return ConstantExpr::RSK_APValue;
273}

275ConstantExpr::ConstantExpr(Expr *SubExpr, ResultStorageKind StorageKind,
                         bool IsImmediateInvocation)
  : FullExpr(ConstantExprClass, SubExpr) {
ConstantExprBits.ResultKind = StorageKind;
ConstantExprBits.APValueKind = APValue::None;
ConstantExprBits.IsUnsigned = false;
ConstantExprBits.BitWidth = 0;
ConstantExprBits.HasCleanup = false;
ConstantExprBits.IsImmediateInvocation = IsImmediateInvocation;

if (StorageKind == ConstantExpr::RSK_APValue)
  ::new (getTrailingObjects<APValue>()) APValue();
287}

289ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
                                 ResultStorageKind StorageKind,
                                 bool IsImmediateInvocation) {
assert(!isa<ConstantExpr>(E))(static_cast<void> (0));
AssertResultStorageKind(StorageKind);

unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
    StorageKind == ConstantExpr::RSK_APValue,
    StorageKind == ConstantExpr::RSK_Int64);
void *Mem = Context.Allocate(Size, alignof(ConstantExpr));
return new (Mem) ConstantExpr(E, StorageKind, IsImmediateInvocation);
300}

302ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
                                 const APValue &Result) {
ResultStorageKind StorageKind = getStorageKind(Result);
ConstantExpr *Self = Create(Context, E, StorageKind);
Self->SetResult(Result, Context);
return Self;
308}

310ConstantExpr::ConstantExpr(EmptyShell Empty, ResultStorageKind StorageKind)
  : FullExpr(ConstantExprClass, Empty) {
ConstantExprBits.ResultKind = StorageKind;

if (StorageKind2.1
'StorageKind' is equal to RSK_APValue
1
'StorageKind' is equal to RSK_APValue
 == ConstantExpr::RSK_APValue)
3
←
Taking true branch→
  ::new (getTrailingObjects<APValue>()) APValue();
4
←
Calling 'TrailingObjects::getTrailingObjects'→
13
←
Returning from 'TrailingObjects::getTrailingObjects'→
14
←
Storage provided to placement new is only 0 bytes, whereas the allocated type requires 72 bytes
316}

318ConstantExpr *ConstantExpr::CreateEmpty(const ASTContext &Context,
                                      ResultStorageKind StorageKind) {
AssertResultStorageKind(StorageKind);

unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
    StorageKind == ConstantExpr::RSK_APValue,
1
Assuming 'StorageKind' is equal to RSK_APValue→
    StorageKind == ConstantExpr::RSK_Int64);
void *Mem = Context.Allocate(Size, alignof(ConstantExpr));
return new (Mem) ConstantExpr(EmptyShell(), StorageKind);
2
←
Calling constructor for 'ConstantExpr'→
327}

329void ConstantExpr::MoveIntoResult(APValue &Value, const ASTContext &Context) {
assert((unsigned)getStorageKind(Value) <= ConstantExprBits.ResultKind &&(static_cast<void> (0))
       "Invalid storage for this value kind")(static_cast<void> (0));
ConstantExprBits.APValueKind = Value.getKind();
switch (ConstantExprBits.ResultKind) {
case RSK_None:
  return;
case RSK_Int64:
  Int64Result() = *Value.getInt().getRawData();
  ConstantExprBits.BitWidth = Value.getInt().getBitWidth();
  ConstantExprBits.IsUnsigned = Value.getInt().isUnsigned();
  return;
case RSK_APValue:
  if (!ConstantExprBits.HasCleanup && Value.needsCleanup()) {
    ConstantExprBits.HasCleanup = true;
    Context.addDestruction(&APValueResult());
  }
  APValueResult() = std::move(Value);
  return;
}
llvm_unreachable("Invalid ResultKind Bits")__builtin_unreachable();
350}

352llvm::APSInt ConstantExpr::getResultAsAPSInt() const {
switch (ConstantExprBits.ResultKind) {
case ConstantExpr::RSK_APValue:
  return APValueResult().getInt();
case ConstantExpr::RSK_Int64:
  return llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
                      ConstantExprBits.IsUnsigned);
default:
  llvm_unreachable("invalid Accessor")__builtin_unreachable();
}
362}

364APValue ConstantExpr::getAPValueResult() const {

switch (ConstantExprBits.ResultKind) {
case ConstantExpr::RSK_APValue:
  return APValueResult();
case ConstantExpr::RSK_Int64:
  return APValue(
      llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
                   ConstantExprBits.IsUnsigned));
case ConstantExpr::RSK_None:
  if (ConstantExprBits.APValueKind == APValue::Indeterminate)
    return APValue::IndeterminateValue();
  return APValue();
}
llvm_unreachable("invalid ResultKind")__builtin_unreachable();
379}

381DeclRefExpr::DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
                       bool RefersToEnclosingVariableOrCapture, QualType T,
                       ExprValueKind VK, SourceLocation L,
                       const DeclarationNameLoc &LocInfo,
                       NonOdrUseReason NOUR)
  : Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D), DNLoc(LocInfo) {
DeclRefExprBits.HasQualifier = false;
DeclRefExprBits.HasTemplateKWAndArgsInfo = false;
DeclRefExprBits.HasFoundDecl = false;
DeclRefExprBits.HadMultipleCandidates = false;
DeclRefExprBits.RefersToEnclosingVariableOrCapture =
    RefersToEnclosingVariableOrCapture;
DeclRefExprBits.NonOdrUseReason = NOUR;
DeclRefExprBits.Loc = L;
setDependence(computeDependence(this, Ctx));
396}

398DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
                       NestedNameSpecifierLoc QualifierLoc,
                       SourceLocation TemplateKWLoc, ValueDecl *D,
                       bool RefersToEnclosingVariableOrCapture,
                       const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
                       const TemplateArgumentListInfo *TemplateArgs,
                       QualType T, ExprValueKind VK, NonOdrUseReason NOUR)
  : Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D),
    DNLoc(NameInfo.getInfo()) {
DeclRefExprBits.Loc = NameInfo.getLoc();
DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
if (QualifierLoc)
  new (getTrailingObjects<NestedNameSpecifierLoc>())
      NestedNameSpecifierLoc(QualifierLoc);
DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
if (FoundD)
  *getTrailingObjects<NamedDecl *>() = FoundD;
DeclRefExprBits.HasTemplateKWAndArgsInfo
  = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
DeclRefExprBits.RefersToEnclosingVariableOrCapture =
    RefersToEnclosingVariableOrCapture;
DeclRefExprBits.NonOdrUseReason = NOUR;
if (TemplateArgs) {
  auto Deps = TemplateArgumentDependence::None;
  getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
      TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
      Deps);
  assert(!(Deps & TemplateArgumentDependence::Dependent) &&(static_cast<void> (0))
         "built a DeclRefExpr with dependent template args")(static_cast<void> (0));
} else if (TemplateKWLoc.isValid()) {
  getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
      TemplateKWLoc);
}
DeclRefExprBits.HadMultipleCandidates = 0;
setDependence(computeDependence(this, Ctx));
433}

435DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
                               NestedNameSpecifierLoc QualifierLoc,
                               SourceLocation TemplateKWLoc, ValueDecl *D,
                               bool RefersToEnclosingVariableOrCapture,
                               SourceLocation NameLoc, QualType T,
                               ExprValueKind VK, NamedDecl *FoundD,
                               const TemplateArgumentListInfo *TemplateArgs,
                               NonOdrUseReason NOUR) {
return Create(Context, QualifierLoc, TemplateKWLoc, D,
              RefersToEnclosingVariableOrCapture,
              DeclarationNameInfo(D->getDeclName(), NameLoc),
              T, VK, FoundD, TemplateArgs, NOUR);
447}

449DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
                               NestedNameSpecifierLoc QualifierLoc,
                               SourceLocation TemplateKWLoc, ValueDecl *D,
                               bool RefersToEnclosingVariableOrCapture,
                               const DeclarationNameInfo &NameInfo,
                               QualType T, ExprValueKind VK,
                               NamedDecl *FoundD,
                               const TemplateArgumentListInfo *TemplateArgs,
                               NonOdrUseReason NOUR) {
// Filter out cases where the found Decl is the same as the value refenenced.
if (D == FoundD)
  FoundD = nullptr;

bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
std::size_t Size =
    totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
                     ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
        QualifierLoc ? 1 : 0, FoundD ? 1 : 0,
        HasTemplateKWAndArgsInfo ? 1 : 0,
        TemplateArgs ? TemplateArgs->size() : 0);

void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
                             RefersToEnclosingVariableOrCapture, NameInfo,
                             FoundD, TemplateArgs, T, VK, NOUR);
474}

476DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
                                    bool HasQualifier,
                                    bool HasFoundDecl,
                                    bool HasTemplateKWAndArgsInfo,
                                    unsigned NumTemplateArgs) {
assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo)(static_cast<void> (0));
std::size_t Size =
    totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
                     ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
        HasQualifier ? 1 : 0, HasFoundDecl ? 1 : 0, HasTemplateKWAndArgsInfo,
        NumTemplateArgs);
void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
return new (Mem) DeclRefExpr(EmptyShell());
489}

491void DeclRefExpr::setDecl(ValueDecl *NewD) {
D = NewD;
if (getType()->isUndeducedType())
  setType(NewD->getType());
setDependence(computeDependence(this, NewD->getASTContext()));
496}

498SourceLocation DeclRefExpr::getBeginLoc() const {
if (hasQualifier())
  return getQualifierLoc().getBeginLoc();
return getNameInfo().getBeginLoc();
502}
503SourceLocation DeclRefExpr::getEndLoc() const {
if (hasExplicitTemplateArgs())
  return getRAngleLoc();
return getNameInfo().getEndLoc();
507}

509SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(SourceLocation OpLoc,
                                                 SourceLocation LParen,
                                                 SourceLocation RParen,
                                                 QualType ResultTy,
                                                 TypeSourceInfo *TSI)
  : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary),
    OpLoc(OpLoc), LParen(LParen), RParen(RParen) {
setTypeSourceInfo(TSI);
setDependence(computeDependence(this));
518}

520SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(EmptyShell Empty,
                                                 QualType ResultTy)
  : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary) {}

524SYCLUniqueStableNameExpr *
525SYCLUniqueStableNameExpr::Create(const ASTContext &Ctx, SourceLocation OpLoc,
                               SourceLocation LParen, SourceLocation RParen,
                               TypeSourceInfo *TSI) {
QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
return new (Ctx)
    SYCLUniqueStableNameExpr(OpLoc, LParen, RParen, ResultTy, TSI);
531}

533SYCLUniqueStableNameExpr *
534SYCLUniqueStableNameExpr::CreateEmpty(const ASTContext &Ctx) {
QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
return new (Ctx) SYCLUniqueStableNameExpr(EmptyShell(), ResultTy);
537}

539std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context) const {
return SYCLUniqueStableNameExpr::ComputeName(Context,
                                             getTypeSourceInfo()->getType());
542}

544std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
                                                QualType Ty) {
auto MangleCallback = [](ASTContext &Ctx,
                         const NamedDecl *ND) -> llvm::Optional<unsigned> {
  // This replaces the 'lambda number' in the mangling with a unique number
  // based on its order in the declaration.  To provide some level of visual
  // notability (actual uniqueness from normal lambdas isn't necessary, as
  // these are used differently), we add 10,000 to the number.
  // For example:
  // _ZTSZ3foovEUlvE10005_
  // Demangles to: typeinfo name for foo()::'lambda10005'()
  // Note that the mangler subtracts 2, since with normal lambdas the lambda
  // mangling number '0' is an anonymous struct mangle, and '1' is omitted.
  // So 10,002 results in the first number being 10,000.
  if (Ctx.IsSYCLKernelNamingDecl(ND))
    return 10'002 + Ctx.GetSYCLKernelNamingIndex(ND);
  return llvm::None;
};
std::unique_ptr<MangleContext> Ctx{ItaniumMangleContext::create(
    Context, Context.getDiagnostics(), MangleCallback)};

std::string Buffer;
Buffer.reserve(128);
llvm::raw_string_ostream Out(Buffer);
Ctx->mangleTypeName(Ty, Out);

return Out.str();
571}

573PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
                             StringLiteral *SL)
  : Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary) {
PredefinedExprBits.Kind = IK;
assert((getIdentKind() == IK) &&(static_cast<void> (0))
       "IdentKind do not fit in PredefinedExprBitfields!")(static_cast<void> (0));
bool HasFunctionName = SL != nullptr;
PredefinedExprBits.HasFunctionName = HasFunctionName;
PredefinedExprBits.Loc = L;
if (HasFunctionName)
  setFunctionName(SL);
setDependence(computeDependence(this));
585}

587PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
  : Expr(PredefinedExprClass, Empty) {
PredefinedExprBits.HasFunctionName = HasFunctionName;
590}

592PredefinedExpr *PredefinedExpr::Create(const ASTContext &Ctx, SourceLocation L,
                                     QualType FNTy, IdentKind IK,
                                     StringLiteral *SL) {
bool HasFunctionName = SL != nullptr;
void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
                         alignof(PredefinedExpr));
return new (Mem) PredefinedExpr(L, FNTy, IK, SL);
599}

601PredefinedExpr *PredefinedExpr::CreateEmpty(const ASTContext &Ctx,
                                          bool HasFunctionName) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(HasFunctionName),
                         alignof(PredefinedExpr));
return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
606}

608StringRef PredefinedExpr::getIdentKindName(PredefinedExpr::IdentKind IK) {
switch (IK) {
case Func:
  return "__func__";
case Function:
  return "__FUNCTION__";
case FuncDName:
  return "__FUNCDNAME__";
case LFunction:
  return "L__FUNCTION__";
case PrettyFunction:
  return "__PRETTY_FUNCTION__";
case FuncSig:
  return "__FUNCSIG__";
case LFuncSig:
  return "L__FUNCSIG__";
case PrettyFunctionNoVirtual:
  break;
}
llvm_unreachable("Unknown ident kind for PredefinedExpr")__builtin_unreachable();
628}

630// FIXME: Maybe this should use DeclPrinter with a special "print predefined
631// expr" policy instead.
632std::string PredefinedExpr::ComputeName(IdentKind IK, const Decl *CurrentDecl) {
ASTContext &Context = CurrentDecl->getASTContext();

if (IK == PredefinedExpr::FuncDName) {
  if (const NamedDecl *ND = dyn_cast<NamedDecl>(CurrentDecl)) {
    std::unique_ptr<MangleContext> MC;
    MC.reset(Context.createMangleContext());

    if (MC->shouldMangleDeclName(ND)) {
      SmallString<256> Buffer;
      llvm::raw_svector_ostream Out(Buffer);
      GlobalDecl GD;
      if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(ND))
        GD = GlobalDecl(CD, Ctor_Base);
      else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(ND))
        GD = GlobalDecl(DD, Dtor_Base);
      else if (ND->hasAttr<CUDAGlobalAttr>())
        GD = GlobalDecl(cast<FunctionDecl>(ND));
      else
        GD = GlobalDecl(ND);
      MC->mangleName(GD, Out);

      if (!Buffer.empty() && Buffer.front() == '\01')
        return std::string(Buffer.substr(1));
      return std::string(Buffer.str());
    }
    return std::string(ND->getIdentifier()->getName());
  }
  return "";
}
if (isa<BlockDecl>(CurrentDecl)) {
  // For blocks we only emit something if it is enclosed in a function
  // For top-level block we'd like to include the name of variable, but we
  // don't have it at this point.
  auto DC = CurrentDecl->getDeclContext();
  if (DC->isFileContext())
    return "";

  SmallString<256> Buffer;
  llvm::raw_svector_ostream Out(Buffer);
  if (auto *DCBlock = dyn_cast<BlockDecl>(DC))
    // For nested blocks, propagate up to the parent.
    Out << ComputeName(IK, DCBlock);
  else if (auto *DCDecl = dyn_cast<Decl>(DC))
    Out << ComputeName(IK, DCDecl) << "_block_invoke";
  return std::string(Out.str());
}
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
  if (IK != PrettyFunction && IK != PrettyFunctionNoVirtual &&
      IK != FuncSig && IK != LFuncSig)
    return FD->getNameAsString();

  SmallString<256> Name;
  llvm::raw_svector_ostream Out(Name);

  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
    if (MD->isVirtual() && IK != PrettyFunctionNoVirtual)
      Out << "virtual ";
    if (MD->isStatic())
      Out << "static ";
  }

  PrintingPolicy Policy(Context.getLangOpts());
  std::string Proto;
  llvm::raw_string_ostream POut(Proto);

  const FunctionDecl *Decl = FD;
  if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
    Decl = Pattern;
  const FunctionType *AFT = Decl->getType()->getAs<FunctionType>();
  const FunctionProtoType *FT = nullptr;
  if (FD->hasWrittenPrototype())
    FT = dyn_cast<FunctionProtoType>(AFT);

  if (IK == FuncSig || IK == LFuncSig) {
    switch (AFT->getCallConv()) {
    case CC_C: POut << "__cdecl "; break;
    case CC_X86StdCall: POut << "__stdcall "; break;
    case CC_X86FastCall: POut << "__fastcall "; break;
    case CC_X86ThisCall: POut << "__thiscall "; break;
    case CC_X86VectorCall: POut << "__vectorcall "; break;
    case CC_X86RegCall: POut << "__regcall "; break;
    // Only bother printing the conventions that MSVC knows about.
    default: break;
    }
  }

  FD->printQualifiedName(POut, Policy);

  POut << "(";
  if (FT) {
    for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
      if (i) POut << ", ";
      POut << Decl->getParamDecl(i)->getType().stream(Policy);
    }

    if (FT->isVariadic()) {
      if (FD->getNumParams()) POut << ", ";
      POut << "...";
    } else if ((IK == FuncSig || IK == LFuncSig ||
                !Context.getLangOpts().CPlusPlus) &&
               !Decl->getNumParams()) {
      POut << "void";
    }
  }
  POut << ")";

  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
    assert(FT && "We must have a written prototype in this case.")(static_cast<void> (0));
    if (FT->isConst())
      POut << " const";
    if (FT->isVolatile())
      POut << " volatile";
    RefQualifierKind Ref = MD->getRefQualifier();
    if (Ref == RQ_LValue)
      POut << " &";
    else if (Ref == RQ_RValue)
      POut << " &&";
  }

  typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
  SpecsTy Specs;
  const DeclContext *Ctx = FD->getDeclContext();
  while (Ctx && isa<NamedDecl>(Ctx)) {
    const ClassTemplateSpecializationDecl *Spec
                             = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
    if (Spec && !Spec->isExplicitSpecialization())
      Specs.push_back(Spec);
    Ctx = Ctx->getParent();
  }

  std::string TemplateParams;
  llvm::raw_string_ostream TOut(TemplateParams);
  for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend();
       I != E; ++I) {
    const TemplateParameterList *Params
                = (*I)->getSpecializedTemplate()->getTemplateParameters();
    const TemplateArgumentList &Args = (*I)->getTemplateArgs();
    assert(Params->size() == Args.size())(static_cast<void> (0));
    for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
      StringRef Param = Params->getParam(i)->getName();
      if (Param.empty()) continue;
      TOut << Param << " = ";
      Args.get(i).print(
          Policy, TOut,
          TemplateParameterList::shouldIncludeTypeForArgument(Params, i));
      TOut << ", ";
    }
  }

  FunctionTemplateSpecializationInfo *FSI
                                        = FD->getTemplateSpecializationInfo();
  if (FSI && !FSI->isExplicitSpecialization()) {
    const TemplateParameterList* Params
                                = FSI->getTemplate()->getTemplateParameters();
    const TemplateArgumentList* Args = FSI->TemplateArguments;
    assert(Params->size() == Args->size())(static_cast<void> (0));
    for (unsigned i = 0, e = Params->size(); i != e; ++i) {
      StringRef Param = Params->getParam(i)->getName();
      if (Param.empty()) continue;
      TOut << Param << " = ";
      Args->get(i).print(Policy, TOut, /*IncludeType*/ true);
      TOut << ", ";
    }
  }

  TOut.flush();
  if (!TemplateParams.empty()) {
    // remove the trailing comma and space
    TemplateParams.resize(TemplateParams.size() - 2);
    POut << " [" << TemplateParams << "]";
  }

  POut.flush();

  // Print "auto" for all deduced return types. This includes C++1y return
  // type deduction and lambdas. For trailing return types resolve the
  // decltype expression. Otherwise print the real type when this is
  // not a constructor or destructor.
  if (isa<CXXMethodDecl>(FD) &&
       cast<CXXMethodDecl>(FD)->getParent()->isLambda())
    Proto = "auto " + Proto;
  else if (FT && FT->getReturnType()->getAs<DecltypeType>())
    FT->getReturnType()
        ->getAs<DecltypeType>()
        ->getUnderlyingType()
        .getAsStringInternal(Proto, Policy);
  else if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
    AFT->getReturnType().getAsStringInternal(Proto, Policy);

  Out << Proto;

  return std::string(Name);
}
if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(CurrentDecl)) {
  for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
    // Skip to its enclosing function or method, but not its enclosing
    // CapturedDecl.
    if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
      const Decl *D = Decl::castFromDeclContext(DC);
      return ComputeName(IK, D);
    }
  llvm_unreachable("CapturedDecl not inside a function or method")__builtin_unreachable();
}
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
  SmallString<256> Name;
  llvm::raw_svector_ostream Out(Name);
  Out << (MD->isInstanceMethod() ? '-' : '+');
  Out << '[';

  // For incorrect code, there might not be an ObjCInterfaceDecl.  Do
  // a null check to avoid a crash.
  if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
    Out << *ID;

  if (const ObjCCategoryImplDecl *CID =
      dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
    Out << '(' << *CID << ')';

  Out <<  ' ';
  MD->getSelector().print(Out);
  Out <<  ']';

  return std::string(Name);
}
if (isa<TranslationUnitDecl>(CurrentDecl) && IK == PrettyFunction) {
  // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
  return "top level";
}
return "";
862}

864void APNumericStorage::setIntValue(const ASTContext &C,
                                 const llvm::APInt &Val) {
if (hasAllocation())
  C.Deallocate(pVal);

BitWidth = Val.getBitWidth();
unsigned NumWords = Val.getNumWords();
const uint64_t* Words = Val.getRawData();
if (NumWords > 1) {
  pVal = new (C) uint64_t[NumWords];
  std::copy(Words, Words + NumWords, pVal);
} else if (NumWords == 1)
  VAL = Words[0];
else
  VAL = 0;
879}

881IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
                             QualType type, SourceLocation l)
  : Expr(IntegerLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l) {
assert(type->isIntegerType() && "Illegal type in IntegerLiteral")(static_cast<void> (0));
assert(V.getBitWidth() == C.getIntWidth(type) &&(static_cast<void> (0))
       "Integer type is not the correct size for constant.")(static_cast<void> (0));
setValue(C, V);
setDependence(ExprDependence::None);
889}

891IntegerLiteral *
892IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
                     QualType type, SourceLocation l) {
return new (C) IntegerLiteral(C, V, type, l);
895}

897IntegerLiteral *
898IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
return new (C) IntegerLiteral(Empty);
900}

902FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
                                   QualType type, SourceLocation l,
                                   unsigned Scale)
  : Expr(FixedPointLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l),
    Scale(Scale) {
assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral")(static_cast<void> (0));
assert(V.getBitWidth() == C.getTypeInfo(type).Width &&(static_cast<void> (0))
       "Fixed point type is not the correct size for constant.")(static_cast<void> (0));
setValue(C, V);
setDependence(ExprDependence::None);
912}

914FixedPointLiteral *FixedPointLiteral::CreateFromRawInt(const ASTContext &C,
                                                     const llvm::APInt &V,
                                                     QualType type,
                                                     SourceLocation l,
                                                     unsigned Scale) {
return new (C) FixedPointLiteral(C, V, type, l, Scale);
920}

922FixedPointLiteral *FixedPointLiteral::Create(const ASTContext &C,
                                           EmptyShell Empty) {
return new (C) FixedPointLiteral(Empty);
925}

927std::string FixedPointLiteral::getValueAsString(unsigned Radix) const {
// Currently the longest decimal number that can be printed is the max for an
// unsigned long _Accum: 4294967295.99999999976716935634613037109375
// which is 43 characters.
SmallString<64> S;
FixedPointValueToString(
    S, llvm::APSInt::getUnsigned(getValue().getZExtValue()), Scale);
return std::string(S.str());
935}

937void CharacterLiteral::print(unsigned Val, CharacterKind Kind,
                           raw_ostream &OS) {
switch (Kind) {
case CharacterLiteral::Ascii:
  break; // no prefix.
case CharacterLiteral::Wide:
  OS << 'L';
  break;
case CharacterLiteral::UTF8:
  OS << "u8";
  break;
case CharacterLiteral::UTF16:
  OS << 'u';
  break;
case CharacterLiteral::UTF32:
  OS << 'U';
  break;
}

switch (Val) {
case '\\':
  OS << "'\\\\'";
  break;
case '\'':
  OS << "'\\''";
  break;
case '\a':
  // TODO: K&R: the meaning of '\\a' is different in traditional C
  OS << "'\\a'";
  break;
case '\b':
  OS << "'\\b'";
  break;
// Nonstandard escape sequence.
/*case '\e':
  OS << "'\\e'";
  break;*/
case '\f':
  OS << "'\\f'";
  break;
case '\n':
  OS << "'\\n'";
  break;
case '\r':
  OS << "'\\r'";
  break;
case '\t':
  OS << "'\\t'";
  break;
case '\v':
  OS << "'\\v'";
  break;
default:
  // A character literal might be sign-extended, which
  // would result in an invalid \U escape sequence.
  // FIXME: multicharacter literals such as '\xFF\xFF\xFF\xFF'
  // are not correctly handled.
  if ((Val & ~0xFFu) == ~0xFFu && Kind == CharacterLiteral::Ascii)
    Val &= 0xFFu;
  if (Val < 256 && isPrintable((unsigned char)Val))
    OS << "'" << (char)Val << "'";
  else if (Val < 256)
    OS << "'\\x" << llvm::format("%02x", Val) << "'";
  else if (Val <= 0xFFFF)
    OS << "'\\u" << llvm::format("%04x", Val) << "'";
  else
    OS << "'\\U" << llvm::format("%08x", Val) << "'";
}
1005}

1007FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
                               bool isexact, QualType Type, SourceLocation L)
  : Expr(FloatingLiteralClass, Type, VK_PRValue, OK_Ordinary), Loc(L) {
setSemantics(V.getSemantics());
FloatingLiteralBits.IsExact = isexact;
setValue(C, V);
setDependence(ExprDependence::None);
1014}

1016FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
: Expr(FloatingLiteralClass, Empty) {
setRawSemantics(llvm::APFloatBase::S_IEEEhalf);
FloatingLiteralBits.IsExact = false;
1020}

1022FloatingLiteral *
1023FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
                      bool isexact, QualType Type, SourceLocation L) {
return new (C) FloatingLiteral(C, V, isexact, Type, L);
1026}

1028FloatingLiteral *
1029FloatingLiteral::Create(const ASTContext &C, EmptyShell Empty) {
return new (C) FloatingLiteral(C, Empty);
1031}

1033/// getValueAsApproximateDouble - This returns the value as an inaccurate
1034/// double.  Note that this may cause loss of precision, but is useful for
1035/// debugging dumps, etc.
1036double FloatingLiteral::getValueAsApproximateDouble() const {
llvm::APFloat V = getValue();
bool ignored;
V.convert(llvm::APFloat::IEEEdouble(), llvm::APFloat::rmNearestTiesToEven,
          &ignored);
return V.convertToDouble();
1042}

1044unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
                                       StringKind SK) {
unsigned CharByteWidth = 0;
switch (SK) {
case Ascii:
case UTF8:
  CharByteWidth = Target.getCharWidth();
  break;
case Wide:
  CharByteWidth = Target.getWCharWidth();
  break;
case UTF16:
  CharByteWidth = Target.getChar16Width();
  break;
case UTF32:
  CharByteWidth = Target.getChar32Width();
  break;
}
assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple")(static_cast<void> (0));
CharByteWidth /= 8;
assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&(static_cast<void> (0))
       "The only supported character byte widths are 1,2 and 4!")(static_cast<void> (0));
return CharByteWidth;
1067}

1069StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
                           StringKind Kind, bool Pascal, QualType Ty,
                           const SourceLocation *Loc,
                           unsigned NumConcatenated)
  : Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary) {
assert(Ctx.getAsConstantArrayType(Ty) &&(static_cast<void> (0))
       "StringLiteral must be of constant array type!")(static_cast<void> (0));
unsigned CharByteWidth = mapCharByteWidth(Ctx.getTargetInfo(), Kind);
unsigned ByteLength = Str.size();
assert((ByteLength % CharByteWidth == 0) &&(static_cast<void> (0))
       "The size of the data must be a multiple of CharByteWidth!")(static_cast<void> (0));

// Avoid the expensive division. The compiler should be able to figure it
// out by itself. However as of clang 7, even with the appropriate
// llvm_unreachable added just here, it is not able to do so.
unsigned Length;
switch (CharByteWidth) {
case 1:
  Length = ByteLength;
  break;
case 2:
  Length = ByteLength / 2;
  break;
case 4:
  Length = ByteLength / 4;
  break;
default:
  llvm_unreachable("Unsupported character width!")__builtin_unreachable();
}

StringLiteralBits.Kind = Kind;
StringLiteralBits.CharByteWidth = CharByteWidth;
StringLiteralBits.IsPascal = Pascal;
StringLiteralBits.NumConcatenated = NumConcatenated;
*getTrailingObjects<unsigned>() = Length;

// Initialize the trailing array of SourceLocation.
// This is safe since SourceLocation is POD-like.
std::memcpy(getTrailingObjects<SourceLocation>(), Loc,
            NumConcatenated * sizeof(SourceLocation));

// Initialize the trailing array of char holding the string data.
std::memcpy(getTrailingObjects<char>(), Str.data(), ByteLength);

setDependence(ExprDependence::None);
1114}

1116StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
                           unsigned Length, unsigned CharByteWidth)
  : Expr(StringLiteralClass, Empty) {
StringLiteralBits.CharByteWidth = CharByteWidth;
StringLiteralBits.NumConcatenated = NumConcatenated;
*getTrailingObjects<unsigned>() = Length;
1122}

1124StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
                                   StringKind Kind, bool Pascal, QualType Ty,
                                   const SourceLocation *Loc,
                                   unsigned NumConcatenated) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<unsigned, SourceLocation, char>(
                             1, NumConcatenated, Str.size()),
                         alignof(StringLiteral));
return new (Mem)
    StringLiteral(Ctx, Str, Kind, Pascal, Ty, Loc, NumConcatenated);
1133}

1135StringLiteral *StringLiteral::CreateEmpty(const ASTContext &Ctx,
                                        unsigned NumConcatenated,
                                        unsigned Length,
                                        unsigned CharByteWidth) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<unsigned, SourceLocation, char>(
                             1, NumConcatenated, Length * CharByteWidth),
                         alignof(StringLiteral));
return new (Mem)
    StringLiteral(EmptyShell(), NumConcatenated, Length, CharByteWidth);
1144}

1146void StringLiteral::outputString(raw_ostream &OS) const {
switch (getKind()) {
case Ascii: break; // no prefix.
case Wide:  OS << 'L'; break;
case UTF8:  OS << "u8"; break;
case UTF16: OS << 'u'; break;
case UTF32: OS << 'U'; break;
}
OS << '"';
static const char Hex[] = "0123456789ABCDEF";

unsigned LastSlashX = getLength();
for (unsigned I = 0, N = getLength(); I != N; ++I) {
  switch (uint32_t Char = getCodeUnit(I)) {
  default:
    // FIXME: Convert UTF-8 back to codepoints before rendering.

    // Convert UTF-16 surrogate pairs back to codepoints before rendering.
    // Leave invalid surrogates alone; we'll use \x for those.
    if (getKind() == UTF16 && I != N - 1 && Char >= 0xd800 &&
        Char <= 0xdbff) {
      uint32_t Trail = getCodeUnit(I + 1);
      if (Trail >= 0xdc00 && Trail <= 0xdfff) {
        Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
        ++I;
      }
    }

    if (Char > 0xff) {
      // If this is a wide string, output characters over 0xff using \x
      // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
      // codepoint: use \x escapes for invalid codepoints.
      if (getKind() == Wide ||
          (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
        // FIXME: Is this the best way to print wchar_t?
        OS << "\\x";
        int Shift = 28;
        while ((Char >> Shift) == 0)
          Shift -= 4;
        for (/**/; Shift >= 0; Shift -= 4)
          OS << Hex[(Char >> Shift) & 15];
        LastSlashX = I;
        break;
      }

      if (Char > 0xffff)
        OS << "\\U00"
           << Hex[(Char >> 20) & 15]
           << Hex[(Char >> 16) & 15];
      else
        OS << "\\u";
      OS << Hex[(Char >> 12) & 15]
         << Hex[(Char >>  8) & 15]
         << Hex[(Char >>  4) & 15]
         << Hex[(Char >>  0) & 15];
      break;
    }

    // If we used \x... for the previous character, and this character is a
    // hexadecimal digit, prevent it being slurped as part of the \x.
    if (LastSlashX + 1 == I) {
      switch (Char) {
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
        case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
        case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
          OS << "\"\"";
      }
    }

    assert(Char <= 0xff &&(static_cast<void> (0))
           "Characters above 0xff should already have been handled.")(static_cast<void> (0));

    if (isPrintable(Char))
      OS << (char)Char;
    else  // Output anything hard as an octal escape.
      OS << '\\'
         << (char)('0' + ((Char >> 6) & 7))
         << (char)('0' + ((Char >> 3) & 7))
         << (char)('0' + ((Char >> 0) & 7));
    break;
  // Handle some common non-printable cases to make dumps prettier.
  case '\\': OS << "\\\\"; break;
  case '"': OS << "\\\""; break;
  case '\a': OS << "\\a"; break;
  case '\b': OS << "\\b"; break;
  case '\f': OS << "\\f"; break;
  case '\n': OS << "\\n"; break;
  case '\r': OS << "\\r"; break;
  case '\t': OS << "\\t"; break;
  case '\v': OS << "\\v"; break;
  }
}
OS << '"';
1240}

1242/// getLocationOfByte - Return a source location that points to the specified
1243/// byte of this string literal.
1244///
1245/// Strings are amazingly complex.  They can be formed from multiple tokens and
1246/// can have escape sequences in them in addition to the usual trigraph and
1247/// escaped newline business.  This routine handles this complexity.
1248///
1249/// The *StartToken sets the first token to be searched in this function and
1250/// the *StartTokenByteOffset is the byte offset of the first token. Before
1251/// returning, it updates the *StartToken to the TokNo of the token being found
1252/// and sets *StartTokenByteOffset to the byte offset of the token in the
1253/// string.
1254/// Using these two parameters can reduce the time complexity from O(n^2) to
1255/// O(n) if one wants to get the location of byte for all the tokens in a
1256/// string.
1257///
1258SourceLocation
1259StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
                               const LangOptions &Features,
                               const TargetInfo &Target, unsigned *StartToken,
                               unsigned *StartTokenByteOffset) const {
assert((getKind() == StringLiteral::Ascii ||(static_cast<void> (0))
        getKind() == StringLiteral::UTF8) &&(static_cast<void> (0))
       "Only narrow string literals are currently supported")(static_cast<void> (0));

// Loop over all of the tokens in this string until we find the one that
// contains the byte we're looking for.
unsigned TokNo = 0;
unsigned StringOffset = 0;
if (StartToken)
  TokNo = *StartToken;
if (StartTokenByteOffset) {
  StringOffset = *StartTokenByteOffset;
  ByteNo -= StringOffset;
}
while (1) {
  assert(TokNo < getNumConcatenated() && "Invalid byte number!")(static_cast<void> (0));
  SourceLocation StrTokLoc = getStrTokenLoc(TokNo);

  // Get the spelling of the string so that we can get the data that makes up
  // the string literal, not the identifier for the macro it is potentially
  // expanded through.
  SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);

  // Re-lex the token to get its length and original spelling.
  std::pair<FileID, unsigned> LocInfo =
      SM.getDecomposedLoc(StrTokSpellingLoc);
  bool Invalid = false;
  StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
  if (Invalid) {
    if (StartTokenByteOffset != nullptr)
      *StartTokenByteOffset = StringOffset;
    if (StartToken != nullptr)
      *StartToken = TokNo;
    return StrTokSpellingLoc;
  }

  const char *StrData = Buffer.data()+LocInfo.second;

  // Create a lexer starting at the beginning of this token.
  Lexer TheLexer(SM.getLocForStartOfFile(LocInfo.first), Features,
                 Buffer.begin(), StrData, Buffer.end());
  Token TheTok;
  TheLexer.LexFromRawLexer(TheTok);

  // Use the StringLiteralParser to compute the length of the string in bytes.
  StringLiteralParser SLP(TheTok, SM, Features, Target);
  unsigned TokNumBytes = SLP.GetStringLength();

  // If the byte is in this token, return the location of the byte.
  if (ByteNo < TokNumBytes ||
      (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
    unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);

    // Now that we know the offset of the token in the spelling, use the
    // preprocessor to get the offset in the original source.
    if (StartTokenByteOffset != nullptr)
      *StartTokenByteOffset = StringOffset;
    if (StartToken != nullptr)
      *StartToken = TokNo;
    return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
  }

  // Move to the next string token.
  StringOffset += TokNumBytes;
  ++TokNo;
  ByteNo -= TokNumBytes;
}
1330}

1332/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1333/// corresponds to, e.g. "sizeof" or "[pre]++".
1334StringRef UnaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
1336#define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1337#include "clang/AST/OperationKinds.def"
}
llvm_unreachable("Unknown unary operator")__builtin_unreachable();
1340}

1342UnaryOperatorKind
1343UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
switch (OO) {
default: llvm_unreachable("No unary operator for overloaded function")__builtin_unreachable();
case OO_PlusPlus:   return Postfix ? UO_PostInc : UO_PreInc;
case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
case OO_Amp:        return UO_AddrOf;
case OO_Star:       return UO_Deref;
case OO_Plus:       return UO_Plus;
case OO_Minus:      return UO_Minus;
case OO_Tilde:      return UO_Not;
case OO_Exclaim:    return UO_LNot;
case OO_Coawait:    return UO_Coawait;
}
1356}

1358OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
switch (Opc) {
case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
case UO_AddrOf: return OO_Amp;
case UO_Deref: return OO_Star;
case UO_Plus: return OO_Plus;
case UO_Minus: return OO_Minus;
case UO_Not: return OO_Tilde;
case UO_LNot: return OO_Exclaim;
case UO_Coawait: return OO_Coawait;
default: return OO_None;
}
1371}


1374//===----------------------------------------------------------------------===//
1375// Postfix Operators.
1376//===----------------------------------------------------------------------===//

1378CallExpr::CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
                 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
                 SourceLocation RParenLoc, FPOptionsOverride FPFeatures,
                 unsigned MinNumArgs, ADLCallKind UsesADL)
  : Expr(SC, Ty, VK, OK_Ordinary), RParenLoc(RParenLoc) {
NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
unsigned NumPreArgs = PreArgs.size();
CallExprBits.NumPreArgs = NumPreArgs;
assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!")(static_cast<void> (0));

unsigned OffsetToTrailingObjects = offsetToTrailingObjects(SC);
CallExprBits.OffsetToTrailingObjects = OffsetToTrailingObjects;
assert((CallExprBits.OffsetToTrailingObjects == OffsetToTrailingObjects) &&(static_cast<void> (0))
       "OffsetToTrailingObjects overflow!")(static_cast<void> (0));

CallExprBits.UsesADL = static_cast<bool>(UsesADL);

setCallee(Fn);
for (unsigned I = 0; I != NumPreArgs; ++I)
  setPreArg(I, PreArgs[I]);
for (unsigned I = 0; I != Args.size(); ++I)
  setArg(I, Args[I]);
for (unsigned I = Args.size(); I != NumArgs; ++I)
  setArg(I, nullptr);

this->computeDependence();

CallExprBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
if (hasStoredFPFeatures())
  setStoredFPFeatures(FPFeatures);
1408}

1410CallExpr::CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
                 bool HasFPFeatures, EmptyShell Empty)
  : Expr(SC, Empty), NumArgs(NumArgs) {
CallExprBits.NumPreArgs = NumPreArgs;
assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!")(static_cast<void> (0));

unsigned OffsetToTrailingObjects = offsetToTrailingObjects(SC);
CallExprBits.OffsetToTrailingObjects = OffsetToTrailingObjects;
assert((CallExprBits.OffsetToTrailingObjects == OffsetToTrailingObjects) &&(static_cast<void> (0))
       "OffsetToTrailingObjects overflow!")(static_cast<void> (0));
CallExprBits.HasFPFeatures = HasFPFeatures;
1421}

1423CallExpr *CallExpr::Create(const ASTContext &Ctx, Expr *Fn,
                         ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
                         SourceLocation RParenLoc,
                         FPOptionsOverride FPFeatures, unsigned MinNumArgs,
                         ADLCallKind UsesADL) {
unsigned NumArgs = std::max<unsigned>(Args.size(), MinNumArgs);
unsigned SizeOfTrailingObjects = CallExpr::sizeOfTrailingObjects(
    /*NumPreArgs=*/0, NumArgs, FPFeatures.requiresTrailingStorage());
void *Mem =
    Ctx.Allocate(sizeof(CallExpr) + SizeOfTrailingObjects, alignof(CallExpr));
return new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
                          RParenLoc, FPFeatures, MinNumArgs, UsesADL);
1435}

1437CallExpr *CallExpr::CreateTemporary(void *Mem, Expr *Fn, QualType Ty,
                                  ExprValueKind VK, SourceLocation RParenLoc,
                                  ADLCallKind UsesADL) {
assert(!(reinterpret_cast<uintptr_t>(Mem) % alignof(CallExpr)) &&(static_cast<void> (0))
       "Misaligned memory in CallExpr::CreateTemporary!")(static_cast<void> (0));
return new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, /*Args=*/{}, Ty,
                          VK, RParenLoc, FPOptionsOverride(),
                          /*MinNumArgs=*/0, UsesADL);
1445}

1447CallExpr *CallExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
                              bool HasFPFeatures, EmptyShell Empty) {
unsigned SizeOfTrailingObjects =
    CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs, HasFPFeatures);
void *Mem =
    Ctx.Allocate(sizeof(CallExpr) + SizeOfTrailingObjects, alignof(CallExpr));
return new (Mem)
    CallExpr(CallExprClass, /*NumPreArgs=*/0, NumArgs, HasFPFeatures, Empty);
1455}

1457unsigned CallExpr::offsetToTrailingObjects(StmtClass SC) {
switch (SC) {
case CallExprClass:
  return sizeof(CallExpr);
case CXXOperatorCallExprClass:
  return sizeof(CXXOperatorCallExpr);
case CXXMemberCallExprClass:
  return sizeof(CXXMemberCallExpr);
case UserDefinedLiteralClass:
  return sizeof(UserDefinedLiteral);
case CUDAKernelCallExprClass:
  return sizeof(CUDAKernelCallExpr);
default:
  llvm_unreachable("unexpected class deriving from CallExpr!")__builtin_unreachable();
}
1472}

1474Decl *Expr::getReferencedDeclOfCallee() {
Expr *CEE = IgnoreParenImpCasts();

while (SubstNonTypeTemplateParmExpr *NTTP =
           dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) {
  CEE = NTTP->getReplacement()->IgnoreParenImpCasts();
}

// If we're calling a dereference, look at the pointer instead.
while (true) {
  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
    if (BO->isPtrMemOp()) {
      CEE = BO->getRHS()->IgnoreParenImpCasts();
      continue;
    }
  } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
    if (UO->getOpcode() == UO_Deref || UO->getOpcode() == UO_AddrOf ||
        UO->getOpcode() == UO_Plus) {
      CEE = UO->getSubExpr()->IgnoreParenImpCasts();
      continue;
    }
  }
  break;
}

if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
  return DRE->getDecl();
if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
  return ME->getMemberDecl();
if (auto *BE = dyn_cast<BlockExpr>(CEE))
  return BE->getBlockDecl();

return nullptr;
1507}

1509/// If this is a call to a builtin, return the builtin ID. If not, return 0.
1510unsigned CallExpr::getBuiltinCallee() const {
auto *FDecl =
    dyn_cast_or_null<FunctionDecl>(getCallee()->getReferencedDeclOfCallee());
return FDecl ? FDecl->getBuiltinID() : 0;
1514}

1516bool CallExpr::isUnevaluatedBuiltinCall(const ASTContext &Ctx) const {
if (unsigned BI = getBuiltinCallee())
  return Ctx.BuiltinInfo.isUnevaluated(BI);
return false;
1520}

1522QualType CallExpr::getCallReturnType(const ASTContext &Ctx) const {
const Expr *Callee = getCallee();
QualType CalleeType = Callee->getType();
if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
  CalleeType = FnTypePtr->getPointeeType();
} else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
  CalleeType = BPT->getPointeeType();
} else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) {
  if (isa<CXXPseudoDestructorExpr>(Callee->IgnoreParens()))
    return Ctx.VoidTy;

  if (isa<UnresolvedMemberExpr>(Callee->IgnoreParens()))
    return Ctx.DependentTy;

  // This should never be overloaded and so should never return null.
  CalleeType = Expr::findBoundMemberType(Callee);
  assert(!CalleeType.isNull())(static_cast<void> (0));
} else if (CalleeType->isDependentType() ||
           CalleeType->isSpecificPlaceholderType(BuiltinType::Overload)) {
  return Ctx.DependentTy;
}

const FunctionType *FnType = CalleeType->castAs<FunctionType>();
return FnType->getReturnType();
1546}

1548const Attr *CallExpr::getUnusedResultAttr(const ASTContext &Ctx) const {
// If the return type is a struct, union, or enum that is marked nodiscard,
// then return the return type attribute.
if (const TagDecl *TD = getCallReturnType(Ctx)->getAsTagDecl())
  if (const auto *A = TD->getAttr<WarnUnusedResultAttr>())
    return A;

// Otherwise, see if the callee is marked nodiscard and return that attribute
// instead.
const Decl *D = getCalleeDecl();
return D ? D->getAttr<WarnUnusedResultAttr>() : nullptr;
1559}

1561SourceLocation CallExpr::getBeginLoc() const {
if (isa<CXXOperatorCallExpr>(this))
  return cast<CXXOperatorCallExpr>(this)->getBeginLoc();

SourceLocation begin = getCallee()->getBeginLoc();
if (begin.isInvalid() && getNumArgs() > 0 && getArg(0))
  begin = getArg(0)->getBeginLoc();
return begin;
1569}
1570SourceLocation CallExpr::getEndLoc() const {
if (isa<CXXOperatorCallExpr>(this))
  return cast<CXXOperatorCallExpr>(this)->getEndLoc();

SourceLocation end = getRParenLoc();
if (end.isInvalid() && getNumArgs() > 0 && getArg(getNumArgs() - 1))
  end = getArg(getNumArgs() - 1)->getEndLoc();
return end;
1578}

1580OffsetOfExpr *OffsetOfExpr::Create(const ASTContext &C, QualType type,
                                 SourceLocation OperatorLoc,
                                 TypeSourceInfo *tsi,
                                 ArrayRef<OffsetOfNode> comps,
                                 ArrayRef<Expr*> exprs,
                                 SourceLocation RParenLoc) {
void *Mem = C.Allocate(
    totalSizeToAlloc<OffsetOfNode, Expr *>(comps.size(), exprs.size()));

return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
                              RParenLoc);
1591}

1593OffsetOfExpr *OffsetOfExpr::CreateEmpty(const ASTContext &C,
                                      unsigned numComps, unsigned numExprs) {
void *Mem =
    C.Allocate(totalSizeToAlloc<OffsetOfNode, Expr *>(numComps, numExprs));
return new (Mem) OffsetOfExpr(numComps, numExprs);
1598}

1600OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
                         SourceLocation OperatorLoc, TypeSourceInfo *tsi,
                         ArrayRef<OffsetOfNode> comps, ArrayRef<Expr *> exprs,
                         SourceLocation RParenLoc)
  : Expr(OffsetOfExprClass, type, VK_PRValue, OK_Ordinary),
    OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
    NumComps(comps.size()), NumExprs(exprs.size()) {
for (unsigned i = 0; i != comps.size(); ++i)
  setComponent(i, comps[i]);
for (unsigned i = 0; i != exprs.size(); ++i)
  setIndexExpr(i, exprs[i]);

setDependence(computeDependence(this));
1613}

1615IdentifierInfo *OffsetOfNode::getFieldName() const {
assert(getKind() == Field || getKind() == Identifier)(static_cast<void> (0));
if (getKind() == Field)
  return getField()->getIdentifier();

return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1621}

1623UnaryExprOrTypeTraitExpr::UnaryExprOrTypeTraitExpr(
  UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
  SourceLocation op, SourceLocation rp)
  : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_PRValue, OK_Ordinary),
    OpLoc(op), RParenLoc(rp) {
assert(ExprKind <= UETT_Last && "invalid enum value!")(static_cast<void> (0));
UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
assert(static_cast<unsigned>(ExprKind) == UnaryExprOrTypeTraitExprBits.Kind &&(static_cast<void> (0))
       "UnaryExprOrTypeTraitExprBits.Kind overflow!")(static_cast<void> (0));
UnaryExprOrTypeTraitExprBits.IsType = false;
Argument.Ex = E;
setDependence(computeDependence(this));
1635}

1637MemberExpr::MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
                     ValueDecl *MemberDecl,
                     const DeclarationNameInfo &NameInfo, QualType T,
                     ExprValueKind VK, ExprObjectKind OK,
                     NonOdrUseReason NOUR)
  : Expr(MemberExprClass, T, VK, OK), Base(Base), MemberDecl(MemberDecl),
    MemberDNLoc(NameInfo.getInfo()), MemberLoc(NameInfo.getLoc()) {
assert(!NameInfo.getName() ||(static_cast<void> (0))
       MemberDecl->getDeclName() == NameInfo.getName())(static_cast<void> (0));
MemberExprBits.IsArrow = IsArrow;
MemberExprBits.HasQualifierOrFoundDecl = false;
MemberExprBits.HasTemplateKWAndArgsInfo = false;
MemberExprBits.HadMultipleCandidates = false;
MemberExprBits.NonOdrUseReason = NOUR;
MemberExprBits.OperatorLoc = OperatorLoc;
setDependence(computeDependence(this));
1653}

1655MemberExpr *MemberExpr::Create(
  const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
  NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
  ValueDecl *MemberDecl, DeclAccessPair FoundDecl,
  DeclarationNameInfo NameInfo, const TemplateArgumentListInfo *TemplateArgs,
  QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR) {
bool HasQualOrFound = QualifierLoc || FoundDecl.getDecl() != MemberDecl ||
                      FoundDecl.getAccess() != MemberDecl->getAccess();
bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
std::size_t Size =
    totalSizeToAlloc<MemberExprNameQualifier, ASTTemplateKWAndArgsInfo,
                     TemplateArgumentLoc>(
        HasQualOrFound ? 1 : 0, HasTemplateKWAndArgsInfo ? 1 : 0,
        TemplateArgs ? TemplateArgs->size() : 0);

void *Mem = C.Allocate(Size, alignof(MemberExpr));
MemberExpr *E = new (Mem) MemberExpr(Base, IsArrow, OperatorLoc, MemberDecl,
                                     NameInfo, T, VK, OK, NOUR);

// FIXME: remove remaining dependence computation to computeDependence().
auto Deps = E->getDependence();
if (HasQualOrFound) {
  // FIXME: Wrong. We should be looking at the member declaration we found.
  if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent())
    Deps |= ExprDependence::TypeValueInstantiation;
  else if (QualifierLoc &&
           QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())
    Deps |= ExprDependence::Instantiation;

  E->MemberExprBits.HasQualifierOrFoundDecl = true;

  MemberExprNameQualifier *NQ =
      E->getTrailingObjects<MemberExprNameQualifier>();
  NQ->QualifierLoc = QualifierLoc;
  NQ->FoundDecl = FoundDecl;
}

E->MemberExprBits.HasTemplateKWAndArgsInfo =
    TemplateArgs || TemplateKWLoc.isValid();

if (TemplateArgs) {
  auto TemplateArgDeps = TemplateArgumentDependence::None;
  E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
      TemplateKWLoc, *TemplateArgs,
      E->getTrailingObjects<TemplateArgumentLoc>(), TemplateArgDeps);
  if (TemplateArgDeps & TemplateArgumentDependence::Instantiation)
    Deps |= ExprDependence::Instantiation;
} else if (TemplateKWLoc.isValid()) {
  E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
      TemplateKWLoc);
}
E->setDependence(Deps);

return E;
1709}

1711MemberExpr *MemberExpr::CreateEmpty(const ASTContext &Context,
                                  bool HasQualifier, bool HasFoundDecl,
                                  bool HasTemplateKWAndArgsInfo,
                                  unsigned NumTemplateArgs) {
assert((!NumTemplateArgs || HasTemplateKWAndArgsInfo) &&(static_cast<void> (0))
       "template args but no template arg info?")(static_cast<void> (0));
bool HasQualOrFound = HasQualifier || HasFoundDecl;
std::size_t Size =
    totalSizeToAlloc<MemberExprNameQualifier, ASTTemplateKWAndArgsInfo,
                     TemplateArgumentLoc>(HasQualOrFound ? 1 : 0,
                                          HasTemplateKWAndArgsInfo ? 1 : 0,
                                          NumTemplateArgs);
void *Mem = Context.Allocate(Size, alignof(MemberExpr));
return new (Mem) MemberExpr(EmptyShell());
1725}

1727void MemberExpr::setMemberDecl(ValueDecl *NewD) {
MemberDecl = NewD;
if (getType()->isUndeducedType())
  setType(NewD->getType());
setDependence(computeDependence(this));
1732}

1734SourceLocation MemberExpr::getBeginLoc() const {
if (isImplicitAccess()) {
  if (hasQualifier())
    return getQualifierLoc().getBeginLoc();
  return MemberLoc;
}

// FIXME: We don't want this to happen. Rather, we should be able to
// detect all kinds of implicit accesses more cleanly.
SourceLocation BaseStartLoc = getBase()->getBeginLoc();
if (BaseStartLoc.isValid())
  return BaseStartLoc;
return MemberLoc;
1747}
1748SourceLocation MemberExpr::getEndLoc() const {
SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
if (hasExplicitTemplateArgs())
  EndLoc = getRAngleLoc();
else if (EndLoc.isInvalid())
  EndLoc = getBase()->getEndLoc();
return EndLoc;
1755}

1757bool CastExpr::CastConsistency() const {
switch (getCastKind()) {
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
case CK_DerivedToBaseMemberPointer:
case CK_BaseToDerived:
case CK_BaseToDerivedMemberPointer:
  assert(!path_empty() && "Cast kind should have a base path!")(static_cast<void> (0));
  break;

case CK_CPointerToObjCPointerCast:
  assert(getType()->isObjCObjectPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isPointerType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_BlockPointerToObjCPointerCast:
  assert(getType()->isObjCObjectPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isBlockPointerType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_ReinterpretMemberPointer:
  assert(getType()->isMemberPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isMemberPointerType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_BitCast:
  // Arbitrary casts to C pointer types count as bitcasts.
  // Otherwise, we should only have block and ObjC pointer casts
  // here if they stay within the type kind.
  if (!getType()->isPointerType()) {
    assert(getType()->isObjCObjectPointerType() ==(static_cast<void> (0))
           getSubExpr()->getType()->isObjCObjectPointerType())(static_cast<void> (0));
    assert(getType()->isBlockPointerType() ==(static_cast<void> (0))
           getSubExpr()->getType()->isBlockPointerType())(static_cast<void> (0));
  }
  goto CheckNoBasePath;

case CK_AnyPointerToBlockPointerCast:
  assert(getType()->isBlockPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isAnyPointerType() &&(static_cast<void> (0))
         !getSubExpr()->getType()->isBlockPointerType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_CopyAndAutoreleaseBlockObject:
  assert(getType()->isBlockPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isBlockPointerType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_FunctionToPointerDecay:
  assert(getType()->isPointerType())(static_cast<void> (0));
  assert(getSubExpr()->getType()->isFunctionType())(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_AddressSpaceConversion: {
  auto Ty = getType();
  auto SETy = getSubExpr()->getType();
  assert(getValueKindForType(Ty) == Expr::getValueKindForType(SETy))(static_cast<void> (0));
  if (isPRValue() && !Ty->isDependentType() && !SETy->isDependentType()) {
    Ty = Ty->getPointeeType();
    SETy = SETy->getPointeeType();
  }
  assert((Ty->isDependentType() || SETy->isDependentType()) ||(static_cast<void> (0))
         (!Ty.isNull() && !SETy.isNull() &&(static_cast<void> (0))
          Ty.getAddressSpace() != SETy.getAddressSpace()))(static_cast<void> (0));
  goto CheckNoBasePath;
}
// These should not have an inheritance path.
case CK_Dynamic:
case CK_ToUnion:
case CK_ArrayToPointerDecay:
case CK_NullToMemberPointer:
case CK_NullToPointer:
case CK_ConstructorConversion:
case CK_IntegralToPointer:
case CK_PointerToIntegral:
case CK_ToVoid:
case CK_VectorSplat:
case CK_IntegralCast:
case CK_BooleanToSignedIntegral:
case CK_IntegralToFloating:
case CK_FloatingToIntegral:
case CK_FloatingCast:
case CK_ObjCObjectLValueCast:
case CK_FloatingRealToComplex:
case CK_FloatingComplexToReal:
case CK_FloatingComplexCast:
case CK_FloatingComplexToIntegralComplex:
case CK_IntegralRealToComplex:
case CK_IntegralComplexToReal:
case CK_IntegralComplexCast:
case CK_IntegralComplexToFloatingComplex:
case CK_ARCProduceObject:
case CK_ARCConsumeObject:
case CK_ARCReclaimReturnedObject:
case CK_ARCExtendBlockObject:
case CK_ZeroToOCLOpaqueType:
case CK_IntToOCLSampler:
case CK_FloatingToFixedPoint:
case CK_FixedPointToFloating:
case CK_FixedPointCast:
case CK_FixedPointToIntegral:
case CK_IntegralToFixedPoint:
case CK_MatrixCast:
  assert(!getType()->isBooleanType() && "unheralded conversion to bool")(static_cast<void> (0));
  goto CheckNoBasePath;

case CK_Dependent:
case CK_LValueToRValue:
case CK_NoOp:
case CK_AtomicToNonAtomic:
case CK_NonAtomicToAtomic:
case CK_PointerToBoolean:
case CK_IntegralToBoolean:
case CK_FloatingToBoolean:
case CK_MemberPointerToBoolean:
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToBoolean:
case CK_LValueBitCast:            // -> bool&
case CK_LValueToRValueBitCast:
case CK_UserDefinedConversion:    // operator bool()
case CK_BuiltinFnToFnPtr:
case CK_FixedPointToBoolean:
CheckNoBasePath:
  assert(path_empty() && "Cast kind should not have a base path!")(static_cast<void> (0));
  break;
}
return true;
1884}

1886const char *CastExpr::getCastKindName(CastKind CK) {
switch (CK) {
1888#define CAST_OPERATION(Name) case CK_##Name: return #Name;
1889#include "clang/AST/OperationKinds.def"
}
llvm_unreachable("Unhandled cast kind!")__builtin_unreachable();
1892}

1894namespace {
const Expr *skipImplicitTemporary(const Expr *E) {
  // Skip through reference binding to temporary.
  if (auto *Materialize = dyn_cast<MaterializeTemporaryExpr>(E))
    E = Materialize->getSubExpr();

  // Skip any temporary bindings; they're implicit.
  if (auto *Binder = dyn_cast<CXXBindTemporaryExpr>(E))
    E = Binder->getSubExpr();

  return E;
}
1906}

1908Expr *CastExpr::getSubExprAsWritten() {
const Expr *SubExpr = nullptr;
const CastExpr *E = this;
do {
  SubExpr = skipImplicitTemporary(E->getSubExpr());

  // Conversions by constructor and conversion functions have a
  // subexpression describing the call; strip it off.
  if (E->getCastKind() == CK_ConstructorConversion)
    SubExpr =
      skipImplicitTemporary(cast<CXXConstructExpr>(SubExpr->IgnoreImplicit())->getArg(0));
  else if (E->getCastKind() == CK_UserDefinedConversion) {
    SubExpr = SubExpr->IgnoreImplicit();
    assert((isa<CXXMemberCallExpr>(SubExpr) ||(static_cast<void> (0))
            isa<BlockExpr>(SubExpr)) &&(static_cast<void> (0))
           "Unexpected SubExpr for CK_UserDefinedConversion.")(static_cast<void> (0));
    if (auto *MCE = dyn_cast<CXXMemberCallExpr>(SubExpr))
      SubExpr = MCE->getImplicitObjectArgument();
  }

  // If the subexpression we're left with is an implicit cast, look
  // through that, too.
} while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));

return const_cast<Expr*>(SubExpr);
1933}

1935NamedDecl *CastExpr::getConversionFunction() const {
const Expr *SubExpr = nullptr;

for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(SubExpr)) {
  SubExpr = skipImplicitTemporary(E->getSubExpr());

  if (E->getCastKind() == CK_ConstructorConversion)
    return cast<CXXConstructExpr>(SubExpr)->getConstructor();

  if (E->getCastKind() == CK_UserDefinedConversion) {
    if (auto *MCE = dyn_cast<CXXMemberCallExpr>(SubExpr))
      return MCE->getMethodDecl();
  }
}

return nullptr;
1951}

1953CXXBaseSpecifier **CastExpr::path_buffer() {
switch (getStmtClass()) {
1955#define ABSTRACT_STMT(x)
1956#define CASTEXPR(Type, Base)                                                   \
case Stmt::Type##Class:                                                      \
  return static_cast<Type *>(this)->getTrailingObjects<CXXBaseSpecifier *>();
1959#define STMT(Type, Base)
1960#include "clang/AST/StmtNodes.inc"
default:
  llvm_unreachable("non-cast expressions not possible here")__builtin_unreachable();
}
1964}

1966const FieldDecl *CastExpr::getTargetFieldForToUnionCast(QualType unionType,
                                                      QualType opType) {
auto RD = unionType->castAs<RecordType>()->getDecl();
return getTargetFieldForToUnionCast(RD, opType);
1970}

1972const FieldDecl *CastExpr::getTargetFieldForToUnionCast(const RecordDecl *RD,
                                                      QualType OpType) {
auto &Ctx = RD->getASTContext();
RecordDecl::field_iterator Field, FieldEnd;
for (Field = RD->field_begin(), FieldEnd = RD->field_end();
     Field != FieldEnd; ++Field) {
  if (Ctx.hasSameUnqualifiedType(Field->getType(), OpType) &&
      !Field->isUnnamedBitfield()) {
    return *Field;
  }
}
return nullptr;
1984}

1986FPOptionsOverride *CastExpr::getTrailingFPFeatures() {
assert(hasStoredFPFeatures())(static_cast<void> (0));
switch (getStmtClass()) {
case ImplicitCastExprClass:
  return static_cast<ImplicitCastExpr *>(this)
      ->getTrailingObjects<FPOptionsOverride>();
case CStyleCastExprClass:
  return static_cast<CStyleCastExpr *>(this)
      ->getTrailingObjects<FPOptionsOverride>();
case CXXFunctionalCastExprClass:
  return static_cast<CXXFunctionalCastExpr *>(this)
      ->getTrailingObjects<FPOptionsOverride>();
case CXXStaticCastExprClass:
  return static_cast<CXXStaticCastExpr *>(this)
      ->getTrailingObjects<FPOptionsOverride>();
default:
  llvm_unreachable("Cast does not have FPFeatures")__builtin_unreachable();
}
2004}

2006ImplicitCastExpr *ImplicitCastExpr::Create(const ASTContext &C, QualType T,
                                         CastKind Kind, Expr *Operand,
                                         const CXXCastPath *BasePath,
                                         ExprValueKind VK,
                                         FPOptionsOverride FPO) {
unsigned PathSize = (BasePath ? BasePath->size() : 0);
void *Buffer =
    C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
        PathSize, FPO.requiresTrailingStorage()));
// Per C++ [conv.lval]p3, lvalue-to-rvalue conversions on class and
// std::nullptr_t have special semantics not captured by CK_LValueToRValue.
assert((Kind != CK_LValueToRValue ||(static_cast<void> (0))
        !(T->isNullPtrType() || T->getAsCXXRecordDecl())) &&(static_cast<void> (0))
       "invalid type for lvalue-to-rvalue conversion")(static_cast<void> (0));
ImplicitCastExpr *E =
    new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, FPO, VK);
if (PathSize)
  std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
                            E->getTrailingObjects<CXXBaseSpecifier *>());
return E;
2026}

2028ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(const ASTContext &C,
                                              unsigned PathSize,
                                              bool HasFPFeatures) {
void *Buffer =
    C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
        PathSize, HasFPFeatures));
return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2035}

2037CStyleCastExpr *CStyleCastExpr::Create(const ASTContext &C, QualType T,
                                     ExprValueKind VK, CastKind K, Expr *Op,
                                     const CXXCastPath *BasePath,
                                     FPOptionsOverride FPO,
                                     TypeSourceInfo *WrittenTy,
                                     SourceLocation L, SourceLocation R) {
unsigned PathSize = (BasePath ? BasePath->size() : 0);
void *Buffer =
    C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
        PathSize, FPO.requiresTrailingStorage()));
CStyleCastExpr *E =
    new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, FPO, WrittenTy, L, R);
if (PathSize)
  std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
                            E->getTrailingObjects<CXXBaseSpecifier *>());
return E;
2053}

2055CStyleCastExpr *CStyleCastExpr::CreateEmpty(const ASTContext &C,
                                          unsigned PathSize,
                                          bool HasFPFeatures) {
void *Buffer =
    C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
        PathSize, HasFPFeatures));
return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2062}

2064/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2065/// corresponds to, e.g. "<<=".
2066StringRef BinaryOperator::getOpcodeStr(Opcode Op) {
switch (Op) {
2068#define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
2069#include "clang/AST/OperationKinds.def"
}
llvm_unreachable("Invalid OpCode!")__builtin_unreachable();
2072}

2074BinaryOperatorKind
2075BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
switch (OO) {
default: llvm_unreachable("Not an overloadable binary operator")__builtin_unreachable();
case OO_Plus: return BO_Add;
case OO_Minus: return BO_Sub;
case OO_Star: return BO_Mul;
case OO_Slash: return BO_Div;
case OO_Percent: return BO_Rem;
case OO_Caret: return BO_Xor;
case OO_Amp: return BO_And;
case OO_Pipe: return BO_Or;
case OO_Equal: return BO_Assign;
case OO_Spaceship: return BO_Cmp;
case OO_Less: return BO_LT;
case OO_Greater: return BO_GT;
case OO_PlusEqual: return BO_AddAssign;
case OO_MinusEqual: return BO_SubAssign;
case OO_StarEqual: return BO_MulAssign;
case OO_SlashEqual: return BO_DivAssign;
case OO_PercentEqual: return BO_RemAssign;
case OO_CaretEqual: return BO_XorAssign;
case OO_AmpEqual: return BO_AndAssign;
case OO_PipeEqual: return BO_OrAssign;
case OO_LessLess: return BO_Shl;
case OO_GreaterGreater: return BO_Shr;
case OO_LessLessEqual: return BO_ShlAssign;
case OO_GreaterGreaterEqual: return BO_ShrAssign;
case OO_EqualEqual: return BO_EQ;
case OO_ExclaimEqual: return BO_NE;
case OO_LessEqual: return BO_LE;
case OO_GreaterEqual: return BO_GE;
case OO_AmpAmp: return BO_LAnd;
case OO_PipePipe: return BO_LOr;
case OO_Comma: return BO_Comma;
case OO_ArrowStar: return BO_PtrMemI;
}
2111}

2113OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
static const OverloadedOperatorKind OverOps[] = {
  /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
  OO_Star, OO_Slash, OO_Percent,
  OO_Plus, OO_Minus,
  OO_LessLess, OO_GreaterGreater,
  OO_Spaceship,
  OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
  OO_EqualEqual, OO_ExclaimEqual,
  OO_Amp,
  OO_Caret,
  OO_Pipe,
  OO_AmpAmp,
  OO_PipePipe,
  OO_Equal, OO_StarEqual,
  OO_SlashEqual, OO_PercentEqual,
  OO_PlusEqual, OO_MinusEqual,
  OO_LessLessEqual, OO_GreaterGreaterEqual,
  OO_AmpEqual, OO_CaretEqual,
  OO_PipeEqual,
  OO_Comma
};
return OverOps[Opc];
2136}

2138bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
                                                    Opcode Opc,
                                                    Expr *LHS, Expr *RHS) {
if (Opc != BO_Add)
  return false;

// Check that we have one pointer and one integer operand.
Expr *PExp;
if (LHS->getType()->isPointerType()) {
  if (!RHS->getType()->isIntegerType())
    return false;
  PExp = LHS;
} else if (RHS->getType()->isPointerType()) {
  if (!LHS->getType()->isIntegerType())
    return false;
  PExp = RHS;
} else {
  return false;
}

// Check that the pointer is a nullptr.
if (!PExp->IgnoreParenCasts()
        ->isNullPointerConstant(Ctx, Expr::NPC_ValueDependentIsNotNull))
  return false;

// Check that the pointee type is char-sized.
const PointerType *PTy = PExp->getType()->getAs<PointerType>();
if (!PTy || !PTy->getPointeeType()->isCharType())
  return false;

return true;
2169}

2171static QualType getDecayedSourceLocExprType(const ASTContext &Ctx,
                                          SourceLocExpr::IdentKind Kind) {
switch (Kind) {
case SourceLocExpr::File:
case SourceLocExpr::Function: {
  QualType ArrTy = Ctx.getStringLiteralArrayType(Ctx.CharTy, 0);
  return Ctx.getPointerType(ArrTy->getAsArrayTypeUnsafe()->getElementType());
}
case SourceLocExpr::Line:
case SourceLocExpr::Column:
  return Ctx.UnsignedIntTy;
}
llvm_unreachable("unhandled case")__builtin_unreachable();
2184}

2186SourceLocExpr::SourceLocExpr(const ASTContext &Ctx, IdentKind Kind,
                           SourceLocation BLoc, SourceLocation RParenLoc,
                           DeclContext *ParentContext)
  : Expr(SourceLocExprClass, getDecayedSourceLocExprType(Ctx, Kind),
         VK_PRValue, OK_Ordinary),
    BuiltinLoc(BLoc), RParenLoc(RParenLoc), ParentContext(ParentContext) {
SourceLocExprBits.Kind = Kind;
setDependence(ExprDependence::None);
2194}

2196StringRef SourceLocExpr::getBuiltinStr() const {
switch (getIdentKind()) {
case File:
  return "__builtin_FILE";
case Function:
  return "__builtin_FUNCTION";
case Line:
  return "__builtin_LINE";
case Column:
  return "__builtin_COLUMN";
}
llvm_unreachable("unexpected IdentKind!")__builtin_unreachable();
2208}

2210APValue SourceLocExpr::EvaluateInContext(const ASTContext &Ctx,
                                       const Expr *DefaultExpr) const {
SourceLocation Loc;
const DeclContext *Context;

std::tie(Loc,
         Context) = [&]() -> std::pair<SourceLocation, const DeclContext *> {
  if (auto *DIE = dyn_cast_or_null<CXXDefaultInitExpr>(DefaultExpr))
    return {DIE->getUsedLocation(), DIE->getUsedContext()};
  if (auto *DAE = dyn_cast_or_null<CXXDefaultArgExpr>(DefaultExpr))
    return {DAE->getUsedLocation(), DAE->getUsedContext()};
  return {this->getLocation(), this->getParentContext()};
}();

PresumedLoc PLoc = Ctx.getSourceManager().getPresumedLoc(
    Ctx.getSourceManager().getExpansionRange(Loc).getEnd());

auto MakeStringLiteral = [&](StringRef Tmp) {
  using LValuePathEntry = APValue::LValuePathEntry;
  StringLiteral *Res = Ctx.getPredefinedStringLiteralFromCache(Tmp);
  // Decay the string to a pointer to the first character.
  LValuePathEntry Path[1] = {LValuePathEntry::ArrayIndex(0)};
  return APValue(Res, CharUnits::Zero(), Path, /*OnePastTheEnd=*/false);
};

switch (getIdentKind()) {
case SourceLocExpr::File: {
  SmallString<256> Path(PLoc.getFilename());
  Ctx.getLangOpts().remapPathPrefix(Path);
  return MakeStringLiteral(Path);
}
case SourceLocExpr::Function: {
  const Decl *CurDecl = dyn_cast_or_null<Decl>(Context);
  return MakeStringLiteral(
      CurDecl ? PredefinedExpr::ComputeName(PredefinedExpr::Function, CurDecl)
              : std::string(""));
}
case SourceLocExpr::Line:
case SourceLocExpr::Column: {
  llvm::APSInt IntVal(Ctx.getIntWidth(Ctx.UnsignedIntTy),
                      /*isUnsigned=*/true);
  IntVal = getIdentKind() == SourceLocExpr::Line ? PLoc.getLine()
                                                 : PLoc.getColumn();
  return APValue(IntVal);
}
}
llvm_unreachable("unhandled case")__builtin_unreachable();
2257}

2259InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
                         ArrayRef<Expr *> initExprs, SourceLocation rbraceloc)
  : Expr(InitListExprClass, QualType(), VK_PRValue, OK_Ordinary),
    InitExprs(C, initExprs.size()), LBraceLoc(lbraceloc),
    RBraceLoc(rbraceloc), AltForm(nullptr, true) {
sawArrayRangeDesignator(false);
InitExprs.insert(C, InitExprs.end(), initExprs.begin(), initExprs.end());

setDependence(computeDependence(this));
2268}

2270void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
if (NumInits > InitExprs.size())
  InitExprs.reserve(C, NumInits);
2273}

2275void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
InitExprs.resize(C, NumInits, nullptr);
2277}

2279Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
if (Init >= InitExprs.size()) {
  InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, nullptr);
  setInit(Init, expr);
  return nullptr;
}

Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
setInit(Init, expr);
return Result;
2289}

2291void InitListExpr::setArrayFiller(Expr *filler) {
assert(!hasArrayFiller() && "Filler already set!")(static_cast<void> (0));
ArrayFillerOrUnionFieldInit = filler;
// Fill out any "holes" in the array due to designated initializers.
Expr **inits = getInits();
for (unsigned i = 0, e = getNumInits(); i != e; ++i)
  if (inits[i] == nullptr)
    inits[i] = filler;
2299}

2301bool InitListExpr::isStringLiteralInit() const {
if (getNumInits() != 1)
  return false;
const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
if (!AT || !AT->getElementType()->isIntegerType())
  return false;
// It is possible for getInit() to return null.
const Expr *Init = getInit(0);
if (!Init)
  return false;
Init = Init->IgnoreParenImpCasts();
return isa<StringLiteral>(Init) || isa<ObjCEncodeExpr>(Init);
2313}

2315bool InitListExpr::isTransparent() const {
assert(isSemanticForm() && "syntactic form never semantically transparent")(static_cast<void> (0));

// A glvalue InitListExpr is always just sugar.
if (isGLValue()) {
  assert(getNumInits() == 1 && "multiple inits in glvalue init list")(static_cast<void> (0));
  return true;
}

// Otherwise, we're sugar if and only if we have exactly one initializer that
// is of the same type.
if (getNumInits() != 1 || !getInit(0))
  return false;

// Don't confuse aggregate initialization of a struct X { X &x; }; with a
// transparent struct copy.
if (!getInit(0)->isPRValue() && getType()->isRecordType())
  return false;

return getType().getCanonicalType() ==
       getInit(0)->getType().getCanonicalType();
2336}

2338bool InitListExpr::isIdiomaticZeroInitializer(const LangOptions &LangOpts) const {
assert(isSyntacticForm() && "only test syntactic form as zero initializer")(static_cast<void> (0));

if (LangOpts.CPlusPlus || getNumInits() != 1 || !getInit(0)) {
  return false;
}

const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(getInit(0)->IgnoreImplicit());
return Lit && Lit->getValue() == 0;
2347}

2349SourceLocation InitListExpr::getBeginLoc() const {
if (InitListExpr *SyntacticForm = getSyntacticForm())
  return SyntacticForm->getBeginLoc();
SourceLocation Beg = LBraceLoc;
if (Beg.isInvalid()) {
  // Find the first non-null initializer.
  for (InitExprsTy::const_iterator I = InitExprs.begin(),
                                   E = InitExprs.end();
    I != E; ++I) {
    if (Stmt *S = *I) {
      Beg = S->getBeginLoc();
      break;
    }
  }
}
return Beg;
2365}

2367SourceLocation InitListExpr::getEndLoc() const {
if (InitListExpr *SyntacticForm = getSyntacticForm())
  return SyntacticForm->getEndLoc();
SourceLocation End = RBraceLoc;
if (End.isInvalid()) {
  // Find the first non-null initializer from the end.
  for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
       E = InitExprs.rend();
       I != E; ++I) {
    if (Stmt *S = *I) {
      End = S->getEndLoc();
      break;
    }
  }
}
return End;
2383}

2385/// getFunctionType - Return the underlying function type for this block.
2386///
2387const FunctionProtoType *BlockExpr::getFunctionType() const {
// The block pointer is never sugared, but the function type might be.
return cast<BlockPointerType>(getType())
         ->getPointeeType()->castAs<FunctionProtoType>();
2391}

2393SourceLocation BlockExpr::getCaretLocation() const {
return TheBlock->getCaretLocation();
2395}
2396const Stmt *BlockExpr::getBody() const {
return TheBlock->getBody();
2398}
2399Stmt *BlockExpr::getBody() {
return TheBlock->getBody();
2401}


2404//===----------------------------------------------------------------------===//
2405// Generic Expression Routines
2406//===----------------------------------------------------------------------===//

2408bool Expr::isReadIfDiscardedInCPlusPlus11() const {
// In C++11, discarded-value expressions of a certain form are special,
// according to [expr]p10:
//   The lvalue-to-rvalue conversion (4.1) is applied only if the
//   expression is a glvalue of volatile-qualified type and it has
//   one of the following forms:
if (!isGLValue() || !getType().isVolatileQualified())
  return false;

const Expr *E = IgnoreParens();

//   - id-expression (5.1.1),
if (isa<DeclRefExpr>(E))
  return true;

//   - subscripting (5.2.1),
if (isa<ArraySubscriptExpr>(E))
  return true;

//   - class member access (5.2.5),
if (isa<MemberExpr>(E))
  return true;

//   - indirection (5.3.1),
if (auto *UO = dyn_cast<UnaryOperator>(E))
  if (UO->getOpcode() == UO_Deref)
    return true;

if (auto *BO = dyn_cast<BinaryOperator>(E)) {
  //   - pointer-to-member operation (5.5),
  if (BO->isPtrMemOp())
    return true;

  //   - comma expression (5.18) where the right operand is one of the above.
  if (BO->getOpcode() == BO_Comma)
    return BO->getRHS()->isReadIfDiscardedInCPlusPlus11();
}

//   - conditional expression (5.16) where both the second and the third
//     operands are one of the above, or
if (auto *CO = dyn_cast<ConditionalOperator>(E))
  return CO->getTrueExpr()->isReadIfDiscardedInCPlusPlus11() &&
         CO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
// The related edge case of "*x ?: *x".
if (auto *BCO =
        dyn_cast<BinaryConditionalOperator>(E)) {
  if (auto *OVE = dyn_cast<OpaqueValueExpr>(BCO->getTrueExpr()))
    return OVE->getSourceExpr()->isReadIfDiscardedInCPlusPlus11() &&
           BCO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
}

// Objective-C++ extensions to the rule.
if (isa<PseudoObjectExpr>(E) || isa<ObjCIvarRefExpr>(E))
  return true;

return false;
2464}

2466/// isUnusedResultAWarning - Return true if this immediate expression should
2467/// be warned about if the result is unused.  If so, fill in Loc and Ranges
2468/// with location to warn on and the source range[s] to report with the
2469/// warning.
2470bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
                                SourceRange &R1, SourceRange &R2,
                                ASTContext &Ctx) const {
// Don't warn if the expr is type dependent. The type could end up
// instantiating to void.
if (isTypeDependent())
  return false;

switch (getStmtClass()) {
default:
  if (getType()->isVoidType())
    return false;
  WarnE = this;
  Loc = getExprLoc();
  R1 = getSourceRange();
  return true;
case ParenExprClass:
  return cast<ParenExpr>(this)->getSubExpr()->
    isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case GenericSelectionExprClass:
  return cast<GenericSelectionExpr>(this)->getResultExpr()->
    isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case CoawaitExprClass:
case CoyieldExprClass:
  return cast<CoroutineSuspendExpr>(this)->getResumeExpr()->
    isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case ChooseExprClass:
  return cast<ChooseExpr>(this)->getChosenSubExpr()->
    isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case UnaryOperatorClass: {
  const UnaryOperator *UO = cast<UnaryOperator>(this);

  switch (UO->getOpcode()) {
  case UO_Plus:
  case UO_Minus:
  case UO_AddrOf:
  case UO_Not:
  case UO_LNot:
  case UO_Deref:
    break;
  case UO_Coawait:
    // This is just the 'operator co_await' call inside the guts of a
    // dependent co_await call.
  case UO_PostInc:
  case UO_PostDec:
  case UO_PreInc:
  case UO_PreDec:                 // ++/--
    return false;  // Not a warning.
  case UO_Real:
  case UO_Imag:
    // accessing a piece of a volatile complex is a side-effect.
    if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
        .isVolatileQualified())
      return false;
    break;
  case UO_Extension:
    return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
  }
  WarnE = this;
  Loc = UO->getOperatorLoc();
  R1 = UO->getSubExpr()->getSourceRange();
  return true;
}
case BinaryOperatorClass: {
  const BinaryOperator *BO = cast<BinaryOperator>(this);
  switch (BO->getOpcode()) {
    default:
      break;
    // Consider the RHS of comma for side effects. LHS was checked by
    // Sema::CheckCommaOperands.
    case BO_Comma:
      // ((foo = <blah>), 0) is an idiom for hiding the result (and
      // lvalue-ness) of an assignment written in a macro.
      if (IntegerLiteral *IE =
            dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
        if (IE->getValue() == 0)
          return false;
      return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
    // Consider '||', '&&' to have side effects if the LHS or RHS does.
    case BO_LAnd:
    case BO_LOr:
      if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
          !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
        return false;
      break;
  }
  if (BO->isAssignmentOp())
    return false;
  WarnE = this;
  Loc = BO->getOperatorLoc();
  R1 = BO->getLHS()->getSourceRange();
  R2 = BO->getRHS()->getSourceRange();
  return true;
}
case CompoundAssignOperatorClass:
case VAArgExprClass:
case AtomicExprClass:
  return false;

case ConditionalOperatorClass: {
  // If only one of the LHS or RHS is a warning, the operator might
  // be being used for control flow. Only warn if both the LHS and
  // RHS are warnings.
  const auto *Exp = cast<ConditionalOperator>(this);
  return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) &&
         Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
}
case BinaryConditionalOperatorClass: {
  const auto *Exp = cast<BinaryConditionalOperator>(this);
  return Exp->getFalseExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
}

case MemberExprClass:
  WarnE = this;
  Loc = cast<MemberExpr>(this)->getMemberLoc();
  R1 = SourceRange(Loc, Loc);
  R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
  return true;

case ArraySubscriptExprClass:
  WarnE = this;
  Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
  R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
  R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
  return true;

case CXXOperatorCallExprClass: {
  // Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
  // overloads as there is no reasonable way to define these such that they
  // have non-trivial, desirable side-effects. See the -Wunused-comparison
  // warning: operators == and != are commonly typo'ed, and so warning on them
  // provides additional value as well. If this list is updated,
  // DiagnoseUnusedComparison should be as well.
  const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this);
  switch (Op->getOperator()) {
  default:
    break;
  case OO_EqualEqual:
  case OO_ExclaimEqual:
  case OO_Less:
  case OO_Greater:
  case OO_GreaterEqual:
  case OO_LessEqual:
    if (Op->getCallReturnType(Ctx)->isReferenceType() ||
        Op->getCallReturnType(Ctx)->isVoidType())
      break;
    WarnE = this;
    Loc = Op->getOperatorLoc();
    R1 = Op->getSourceRange();
    return true;
  }

  // Fallthrough for generic call handling.
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
}
case CallExprClass:
case CXXMemberCallExprClass:
case UserDefinedLiteralClass: {
  // If this is a direct call, get the callee.
  const CallExpr *CE = cast<CallExpr>(this);
  if (const Decl *FD = CE->getCalleeDecl()) {
    // If the callee has attribute pure, const, or warn_unused_result, warn
    // about it. void foo() { strlen("bar"); } should warn.
    //
    // Note: If new cases are added here, DiagnoseUnusedExprResult should be
    // updated to match for QoI.
    if (CE->hasUnusedResultAttr(Ctx) ||
        FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>()) {
      WarnE = this;
      Loc = CE->getCallee()->getBeginLoc();
      R1 = CE->getCallee()->getSourceRange();

      if (unsigned NumArgs = CE->getNumArgs())
        R2 = SourceRange(CE->getArg(0)->getBeginLoc(),
                         CE->getArg(NumArgs - 1)->getEndLoc());
      return true;
    }
  }
  return false;
}

// If we don't know precisely what we're looking at, let's not warn.
case UnresolvedLookupExprClass:
case CXXUnresolvedConstructExprClass:
case RecoveryExprClass:
  return false;

case CXXTemporaryObjectExprClass:
case CXXConstructExprClass: {
  if (const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl()) {
    const auto *WarnURAttr = Type->getAttr<WarnUnusedResultAttr>();
    if (Type->hasAttr<WarnUnusedAttr>() ||
        (WarnURAttr && WarnURAttr->IsCXX11NoDiscard())) {
      WarnE = this;
      Loc = getBeginLoc();
      R1 = getSourceRange();
      return true;
    }
  }

  const auto *CE = cast<CXXConstructExpr>(this);
  if (const CXXConstructorDecl *Ctor = CE->getConstructor()) {
    const auto *WarnURAttr = Ctor->getAttr<WarnUnusedResultAttr>();
    if (WarnURAttr && WarnURAttr->IsCXX11NoDiscard()) {
      WarnE = this;
      Loc = getBeginLoc();
      R1 = getSourceRange();

      if (unsigned NumArgs = CE->getNumArgs())
        R2 = SourceRange(CE->getArg(0)->getBeginLoc(),
                         CE->getArg(NumArgs - 1)->getEndLoc());
      return true;
    }
  }

  return false;
}

case ObjCMessageExprClass: {
  const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
  if (Ctx.getLangOpts().ObjCAutoRefCount &&
      ME->isInstanceMessage() &&
      !ME->getType()->isVoidType() &&
      ME->getMethodFamily() == OMF_init) {
    WarnE = this;
    Loc = getExprLoc();
    R1 = ME->getSourceRange();
    return true;
  }

  if (const ObjCMethodDecl *MD = ME->getMethodDecl())
    if (MD->hasAttr<WarnUnusedResultAttr>()) {
      WarnE = this;
      Loc = getExprLoc();
      return true;
    }

  return false;
}

case ObjCPropertyRefExprClass:
  WarnE = this;
  Loc = getExprLoc();
  R1 = getSourceRange();
  return true;

case PseudoObjectExprClass: {
  const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);

  // Only complain about things that have the form of a getter.
  if (isa<UnaryOperator>(PO->getSyntacticForm()) ||
      isa<BinaryOperator>(PO->getSyntacticForm()))
    return false;

  WarnE = this;
  Loc = getExprLoc();
  R1 = getSourceRange();
  return true;
}

case StmtExprClass: {
  // Statement exprs don't logically have side effects themselves, but are
  // sometimes used in macros in ways that give them a type that is unused.
  // For example ({ blah; foo(); }) will end up with a type if foo has a type.
  // however, if the result of the stmt expr is dead, we don't want to emit a
  // warning.
  const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
  if (!CS->body_empty()) {
    if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
      return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
    if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
      if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
        return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
  }

  if (getType()->isVoidType())
    return false;
  WarnE = this;
  Loc = cast<StmtExpr>(this)->getLParenLoc();
  R1 = getSourceRange();
  return true;
}
case CXXFunctionalCastExprClass:
case CStyleCastExprClass: {
  // Ignore an explicit cast to void, except in C++98 if the operand is a
  // volatile glvalue for which we would trigger an implicit read in any
  // other language mode. (Such an implicit read always happens as part of
  // the lvalue conversion in C, and happens in C++ for expressions of all
  // forms where it seems likely the user intended to trigger a volatile
  // load.)
  const CastExpr *CE = cast<CastExpr>(this);
  const Expr *SubE = CE->getSubExpr()->IgnoreParens();
  if (CE->getCastKind() == CK_ToVoid) {
    if (Ctx.getLangOpts().CPlusPlus && !Ctx.getLangOpts().CPlusPlus11 &&
        SubE->isReadIfDiscardedInCPlusPlus11()) {
      // Suppress the "unused value" warning for idiomatic usage of
      // '(void)var;' used to suppress "unused variable" warnings.
      if (auto *DRE = dyn_cast<DeclRefExpr>(SubE))
        if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
          if (!VD->isExternallyVisible())
            return false;

      // The lvalue-to-rvalue conversion would have no effect for an array.
      // It's implausible that the programmer expected this to result in a
      // volatile array load, so don't warn.
      if (SubE->getType()->isArrayType())
        return false;

      return SubE->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
    }
    return false;
  }

  // If this is a cast to a constructor conversion, check the operand.
  // Otherwise, the result of the cast is unused.
  if (CE->getCastKind() == CK_ConstructorConversion)
    return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
  if (CE->getCastKind() == CK_Dependent)
    return false;

  WarnE = this;
  if (const CXXFunctionalCastExpr *CXXCE =
          dyn_cast<CXXFunctionalCastExpr>(this)) {
    Loc = CXXCE->getBeginLoc();
    R1 = CXXCE->getSubExpr()->getSourceRange();
  } else {
    const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(this);
    Loc = CStyleCE->getLParenLoc();
    R1 = CStyleCE->getSubExpr()->getSourceRange();
  }
  return true;
}
case ImplicitCastExprClass: {
  const CastExpr *ICE = cast<ImplicitCastExpr>(this);

  // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
  if (ICE->getCastKind() == CK_LValueToRValue &&
      ICE->getSubExpr()->getType().isVolatileQualified())
    return false;

  return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
}
case CXXDefaultArgExprClass:
  return (cast<CXXDefaultArgExpr>(this)
          ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
case CXXDefaultInitExprClass:
  return (cast<CXXDefaultInitExpr>(this)
          ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));

case CXXNewExprClass:
  // FIXME: In theory, there might be new expressions that don't have side
  // effects (e.g. a placement new with an uninitialized POD).
case CXXDeleteExprClass:
  return false;
case MaterializeTemporaryExprClass:
  return cast<MaterializeTemporaryExpr>(this)
      ->getSubExpr()
      ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case CXXBindTemporaryExprClass:
  return cast<CXXBindTemporaryExpr>(this)->getSubExpr()
             ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
case ExprWithCleanupsClass:
  return cast<ExprWithCleanups>(this)->getSubExpr()
             ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
}
2835}

2837/// isOBJCGCCandidate - Check if an expression is objc gc'able.
2838/// returns true, if it is; false otherwise.
2839bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
const Expr *E = IgnoreParens();
switch (E->getStmtClass()) {
default:
  return false;
case ObjCIvarRefExprClass:
  return true;
case Expr::UnaryOperatorClass:
  return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case ImplicitCastExprClass:
  return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case MaterializeTemporaryExprClass:
  return cast<MaterializeTemporaryExpr>(E)->getSubExpr()->isOBJCGCCandidate(
      Ctx);
case CStyleCastExprClass:
  return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
case DeclRefExprClass: {
  const Decl *D = cast<DeclRefExpr>(E)->getDecl();

  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
    if (VD->hasGlobalStorage())
      return true;
    QualType T = VD->getType();
    // dereferencing to a  pointer is always a gc'able candidate,
    // unless it is __weak.
    return T->isPointerType() &&
           (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
  }
  return false;
}
case MemberExprClass: {
  const MemberExpr *M = cast<MemberExpr>(E);
  return M->getBase()->isOBJCGCCandidate(Ctx);
}
case ArraySubscriptExprClass:
  return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx);
}
2876}

2878bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
if (isTypeDependent())
  return false;
return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
2882}

2884QualType Expr::findBoundMemberType(const Expr *expr) {
assert(expr->hasPlaceholderType(BuiltinType::BoundMember))(static_cast<void> (0));

// Bound member expressions are always one of these possibilities:
//   x->m      x.m      x->*y      x.*y
// (possibly parenthesized)

expr = expr->IgnoreParens();
if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) {
  assert(isa<CXXMethodDecl>(mem->getMemberDecl()))(static_cast<void> (0));
  return mem->getMemberDecl()->getType();
}

if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) {
  QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
                    ->getPointeeType();
  assert(type->isFunctionType())(static_cast<void> (0));
  return type;
}

assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr))(static_cast<void> (0));
return QualType();
2906}

2908Expr *Expr::IgnoreImpCasts() {
return IgnoreExprNodes(this, IgnoreImplicitCastsSingleStep);
2910}

2912Expr *Expr::IgnoreCasts() {
return IgnoreExprNodes(this, IgnoreCastsSingleStep);
2914}

2916Expr *Expr::IgnoreImplicit() {
return IgnoreExprNodes(this, IgnoreImplicitSingleStep);
2918}

2920Expr *Expr::IgnoreImplicitAsWritten() {
return IgnoreExprNodes(this, IgnoreImplicitAsWrittenSingleStep);
2922}

2924Expr *Expr::IgnoreParens() {
return IgnoreExprNodes(this, IgnoreParensSingleStep);
2926}

2928Expr *Expr::IgnoreParenImpCasts() {
return IgnoreExprNodes(this, IgnoreParensSingleStep,
                       IgnoreImplicitCastsExtraSingleStep);
2931}

2933Expr *Expr::IgnoreParenCasts() {
return IgnoreExprNodes(this, IgnoreParensSingleStep, IgnoreCastsSingleStep);
2935}

2937Expr *Expr::IgnoreConversionOperatorSingleStep() {
if (auto *MCE = dyn_cast<CXXMemberCallExpr>(this)) {
  if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl()))
    return MCE->getImplicitObjectArgument();
}
return this;
2943}

2945Expr *Expr::IgnoreParenLValueCasts() {
return IgnoreExprNodes(this, IgnoreParensSingleStep,
                       IgnoreLValueCastsSingleStep);
2948}

2950Expr *Expr::IgnoreParenBaseCasts() {
return IgnoreExprNodes(this, IgnoreParensSingleStep,
                       IgnoreBaseCastsSingleStep);
2953}

2955Expr *Expr::IgnoreParenNoopCasts(const ASTContext &Ctx) {
auto IgnoreNoopCastsSingleStep = [&Ctx](Expr *E) {
  if (auto *CE = dyn_cast<CastExpr>(E)) {
    // We ignore integer <-> casts that are of the same width, ptr<->ptr and
    // ptr<->int casts of the same width. We also ignore all identity casts.
    Expr *SubExpr = CE->getSubExpr();
    bool IsIdentityCast =
        Ctx.hasSameUnqualifiedType(E->getType(), SubExpr->getType());
    bool IsSameWidthCast = (E->getType()->isPointerType() ||
                            E->getType()->isIntegralType(Ctx)) &&
                           (SubExpr->getType()->isPointerType() ||
                            SubExpr->getType()->isIntegralType(Ctx)) &&
                           (Ctx.getTypeSize(E->getType()) ==
                            Ctx.getTypeSize(SubExpr->getType()));

    if (IsIdentityCast || IsSameWidthCast)
      return SubExpr;
  } else if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
    return NTTP->getReplacement();

  return E;
};
return IgnoreExprNodes(this, IgnoreParensSingleStep,
                       IgnoreNoopCastsSingleStep);
2979}

2981Expr *Expr::IgnoreUnlessSpelledInSource() {
auto IgnoreImplicitConstructorSingleStep = [](Expr *E) {
  if (auto *Cast = dyn_cast<CXXFunctionalCastExpr>(E)) {
    auto *SE = Cast->getSubExpr();
    if (SE->getSourceRange() == E->getSourceRange())
      return SE;
  }

  if (auto *C = dyn_cast<CXXConstructExpr>(E)) {
    auto NumArgs = C->getNumArgs();
    if (NumArgs == 1 ||
        (NumArgs > 1 && isa<CXXDefaultArgExpr>(C->getArg(1)))) {
      Expr *A = C->getArg(0);
      if (A->getSourceRange() == E->getSourceRange() || C->isElidable())
        return A;
    }
  }
  return E;
};
auto IgnoreImplicitMemberCallSingleStep = [](Expr *E) {
  if (auto *C = dyn_cast<CXXMemberCallExpr>(E)) {
    Expr *ExprNode = C->getImplicitObjectArgument();
    if (ExprNode->getSourceRange() == E->getSourceRange()) {
      return ExprNode;
    }
    if (auto *PE = dyn_cast<ParenExpr>(ExprNode)) {
      if (PE->getSourceRange() == C->getSourceRange()) {
        return cast<Expr>(PE);
      }
    }
    ExprNode = ExprNode->IgnoreParenImpCasts();
    if (ExprNode->getSourceRange() == E->getSourceRange())
      return ExprNode;
  }
  return E;
};
return IgnoreExprNodes(
    this, IgnoreImplicitSingleStep, IgnoreImplicitCastsExtraSingleStep,
    IgnoreParensOnlySingleStep, IgnoreImplicitConstructorSingleStep,
    IgnoreImplicitMemberCallSingleStep);
3021}

3023bool Expr::isDefaultArgument() const {
const Expr *E = this;
if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
  E = M->getSubExpr();

while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
  E = ICE->getSubExprAsWritten();

return isa<CXXDefaultArgExpr>(E);
3032}

3034/// Skip over any no-op casts and any temporary-binding
3035/// expressions.
3036static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
  E = M->getSubExpr();

while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (ICE->getCastKind() == CK_NoOp)
    E = ICE->getSubExpr();
  else
    break;
}

while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
  E = BE->getSubExpr();

while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (ICE->getCastKind() == CK_NoOp)
    E = ICE->getSubExpr();
  else
    break;
}

return E->IgnoreParens();
3058}

3060/// isTemporaryObject - Determines if this expression produces a
3061/// temporary of the given class type.
3062bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy)))
  return false;

const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this);

// Temporaries are by definition pr-values of class type.
if (!E->Classify(C).isPRValue()) {
  // In this context, property reference is a message call and is pr-value.
  if (!isa<ObjCPropertyRefExpr>(E))
    return false;
}

// Black-list a few cases which yield pr-values of class type that don't
// refer to temporaries of that type:

// - implicit derived-to-base conversions
if (isa<ImplicitCastExpr>(E)) {
  switch (cast<ImplicitCastExpr>(E)->getCastKind()) {
  case CK_DerivedToBase:
  case CK_UncheckedDerivedToBase:
    return false;
  default:
    break;
  }
}

// - member expressions (all)
if (isa<MemberExpr>(E))
  return false;

if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E))
  if (BO->isPtrMemOp())
    return false;

// - opaque values (all)
if (isa<OpaqueValueExpr>(E))
  return false;

return true;
3102}

3104bool Expr::isImplicitCXXThis() const {
const Expr *E = this;

// Strip away parentheses and casts we don't care about.
while (true) {
  if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) {
    E = Paren->getSubExpr();
    continue;
  }

  if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
    if (ICE->getCastKind() == CK_NoOp ||
        ICE->getCastKind() == CK_LValueToRValue ||
        ICE->getCastKind() == CK_DerivedToBase ||
        ICE->getCastKind() == CK_UncheckedDerivedToBase) {
      E = ICE->getSubExpr();
      continue;
    }
  }

  if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) {
    if (UnOp->getOpcode() == UO_Extension) {
      E = UnOp->getSubExpr();
      continue;
    }
  }

  if (const MaterializeTemporaryExpr *M
                                    = dyn_cast<MaterializeTemporaryExpr>(E)) {
    E = M->getSubExpr();
    continue;
  }

  break;
}

if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E))
  return This->isImplicit();

return false;
3144}

3146/// hasAnyTypeDependentArguments - Determines if any of the expressions
3147/// in Exprs is type-dependent.
3148bool Expr::hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs) {
for (unsigned I = 0; I < Exprs.size(); ++I)
  if (Exprs[I]->isTypeDependent())
    return true;

return false;
3154}

3156bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
                               const Expr **Culprit) const {
assert(!isValueDependent() &&(static_cast<void> (0))
       "Expression evaluator can't be called on a dependent expression.")(static_cast<void> (0));

// This function is attempting whether an expression is an initializer
// which can be evaluated at compile-time. It very closely parallels
// ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
// will lead to unexpected results.  Like ConstExprEmitter, it falls back
// to isEvaluatable most of the time.
//
// If we ever capture reference-binding directly in the AST, we can
// kill the second parameter.

if (IsForRef) {
  EvalResult Result;
  if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
    return true;
  if (Culprit)
    *Culprit = this;
  return false;
}

switch (getStmtClass()) {
default: break;
case Stmt::ExprWithCleanupsClass:
  return cast<ExprWithCleanups>(this)->getSubExpr()->isConstantInitializer(
      Ctx, IsForRef, Culprit);
case StringLiteralClass:
case ObjCEncodeExprClass:
  return true;
case CXXTemporaryObjectExprClass:
case CXXConstructExprClass: {
  const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);

  if (CE->getConstructor()->isTrivial() &&
      CE->getConstructor()->getParent()->hasTrivialDestructor()) {
    // Trivial default constructor
    if (!CE->getNumArgs()) return true;

    // Trivial copy constructor
    assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument")(static_cast<void> (0));
    return CE->getArg(0)->isConstantInitializer(Ctx, false, Culprit);
  }

  break;
}
case ConstantExprClass: {
  // FIXME: We should be able to return "true" here, but it can lead to extra
  // error messages. E.g. in Sema/array-init.c.
  const Expr *Exp = cast<ConstantExpr>(this)->getSubExpr();
  return Exp->isConstantInitializer(Ctx, false, Culprit);
}
case CompoundLiteralExprClass: {
  // This handles gcc's extension that allows global initializers like
  // "struct x {int x;} x = (struct x) {};".
  // FIXME: This accepts other cases it shouldn't!
  const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
  return Exp->isConstantInitializer(Ctx, false, Culprit);
}
case DesignatedInitUpdateExprClass: {
  const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(this);
  return DIUE->getBase()->isConstantInitializer(Ctx, false, Culprit) &&
         DIUE->getUpdater()->isConstantInitializer(Ctx, false, Culprit);
}
case InitListExprClass: {
  const InitListExpr *ILE = cast<InitListExpr>(this);
  assert(ILE->isSemanticForm() && "InitListExpr must be in semantic form")(static_cast<void> (0));
  if (ILE->getType()->isArrayType()) {
    unsigned numInits = ILE->getNumInits();
    for (unsigned i = 0; i < numInits; i++) {
      if (!ILE->getInit(i)->isConstantInitializer(Ctx, false, Culprit))
        return false;
    }
    return true;
  }

  if (ILE->getType()->isRecordType()) {
    unsigned ElementNo = 0;
    RecordDecl *RD = ILE->getType()->castAs<RecordType>()->getDecl();
    for (const auto *Field : RD->fields()) {
      // If this is a union, skip all the fields that aren't being initialized.
      if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
        continue;

      // Don't emit anonymous bitfields, they just affect layout.
      if (Field->isUnnamedBitfield())
        continue;

      if (ElementNo < ILE->getNumInits()) {
        const Expr *Elt = ILE->getInit(ElementNo++);
        if (Field->isBitField()) {
          // Bitfields have to evaluate to an integer.
          EvalResult Result;
          if (!Elt->EvaluateAsInt(Result, Ctx)) {
            if (Culprit)
              *Culprit = Elt;
            return false;
          }
        } else {
          bool RefType = Field->getType()->isReferenceType();
          if (!Elt->isConstantInitializer(Ctx, RefType, Culprit))
            return false;
        }
      }
    }
    return true;
  }

  break;
}
case ImplicitValueInitExprClass:
case NoInitExprClass:
  return true;
case ParenExprClass:
  return cast<ParenExpr>(this)->getSubExpr()
    ->isConstantInitializer(Ctx, IsForRef, Culprit);
case GenericSelectionExprClass:
  return cast<GenericSelectionExpr>(this)->getResultExpr()
    ->isConstantInitializer(Ctx, IsForRef, Culprit);
case ChooseExprClass:
  if (cast<ChooseExpr>(this)->isConditionDependent()) {
    if (Culprit)
      *Culprit = this;
    return false;
  }
  return cast<ChooseExpr>(this)->getChosenSubExpr()
    ->isConstantInitializer(Ctx, IsForRef, Culprit);
case UnaryOperatorClass: {
  const UnaryOperator* Exp = cast<UnaryOperator>(this);
  if (Exp->getOpcode() == UO_Extension)
    return Exp->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);
  break;
}
case CXXFunctionalCastExprClass:
case CXXStaticCastExprClass:
case ImplicitCastExprClass:
case CStyleCastExprClass:
case ObjCBridgedCastExprClass:
case CXXDynamicCastExprClass:
case CXXReinterpretCastExprClass:
case CXXAddrspaceCastExprClass:
case CXXConstCastExprClass: {
  const CastExpr *CE = cast<CastExpr>(this);

  // Handle misc casts we want to ignore.
  if (CE->getCastKind() == CK_NoOp ||
      CE->getCastKind() == CK_LValueToRValue ||
      CE->getCastKind() == CK_ToUnion ||
      CE->getCastKind() == CK_ConstructorConversion ||
      CE->getCastKind() == CK_NonAtomicToAtomic ||
      CE->getCastKind() == CK_AtomicToNonAtomic ||
      CE->getCastKind() == CK_IntToOCLSampler)
    return CE->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);

  break;
}
case MaterializeTemporaryExprClass:
  return cast<MaterializeTemporaryExpr>(this)
      ->getSubExpr()
      ->isConstantInitializer(Ctx, false, Culprit);

case SubstNonTypeTemplateParmExprClass:
  return cast<SubstNonTypeTemplateParmExpr>(this)->getReplacement()
    ->isConstantInitializer(Ctx, false, Culprit);
case CXXDefaultArgExprClass:
  return cast<CXXDefaultArgExpr>(this)->getExpr()
    ->isConstantInitializer(Ctx, false, Culprit);
case CXXDefaultInitExprClass:
  return cast<CXXDefaultInitExpr>(this)->getExpr()
    ->isConstantInitializer(Ctx, false, Culprit);
}
// Allow certain forms of UB in constant initializers: signed integer
// overflow and floating-point division by zero. We'll give a warning on
// these, but they're common enough that we have to accept them.
if (isEvaluatable(Ctx, SE_AllowUndefinedBehavior))
  return true;
if (Culprit)
  *Culprit = this;
return false;
3336}

3338bool CallExpr::isBuiltinAssumeFalse(const ASTContext &Ctx) const {
const FunctionDecl* FD = getDirectCallee();
if (!FD || (FD->getBuiltinID() != Builtin::BI__assume &&
            FD->getBuiltinID() != Builtin::BI__builtin_assume))
  return false;

const Expr* Arg = getArg(0);
bool ArgVal;
return !Arg->isValueDependent() &&
       Arg->EvaluateAsBooleanCondition(ArgVal, Ctx) && !ArgVal;
3348}

3350namespace {
/// Look for any side effects within a Stmt.
class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
  typedef ConstEvaluatedExprVisitor<SideEffectFinder> Inherited;
  const bool IncludePossibleEffects;
  bool HasSideEffects;

public:
  explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
    : Inherited(Context),
      IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }

  bool hasSideEffects() const { return HasSideEffects; }

  void VisitDecl(const Decl *D) {
    if (!D)
      return;

    // We assume the caller checks subexpressions (eg, the initializer, VLA
    // bounds) for side-effects on our behalf.
    if (auto *VD = dyn_cast<VarDecl>(D)) {
      // Registering a destructor is a side-effect.
      if (IncludePossibleEffects && VD->isThisDeclarationADefinition() &&
          VD->needsDestruction(Context))
        HasSideEffects = true;
    }
  }

  void VisitDeclStmt(const DeclStmt *DS) {
    for (auto *D : DS->decls())
      VisitDecl(D);
    Inherited::VisitDeclStmt(DS);
  }

  void VisitExpr(const Expr *E) {
    if (!HasSideEffects &&
        E->HasSideEffects(Context, IncludePossibleEffects))
      HasSideEffects = true;
  }
};
3390}

3392bool Expr::HasSideEffects(const ASTContext &Ctx,
                        bool IncludePossibleEffects) const {
// In circumstances where we care about definite side effects instead of
// potential side effects, we want to ignore expressions that are part of a
// macro expansion as a potential side effect.
if (!IncludePossibleEffects && getExprLoc().isMacroID())
  return false;

switch (getStmtClass()) {
case NoStmtClass:
#define ABSTRACT_STMT(Type)
#define STMT(Type, Base) case Type##Class:
#define EXPR(Type, Base)
#include "clang/AST/StmtNodes.inc"
  llvm_unreachable("unexpected Expr kind")__builtin_unreachable();

case DependentScopeDeclRefExprClass:
case CXXUnresolvedConstructExprClass:
case CXXDependentScopeMemberExprClass:
case UnresolvedLookupExprClass:
case UnresolvedMemberExprClass:
case PackExpansionExprClass:
case SubstNonTypeTemplateParmPackExprClass:
case FunctionParmPackExprClass:
case TypoExprClass:
case RecoveryExprClass:
case CXXFoldExprClass:
  // Make a conservative assumption for dependent nodes.
  return IncludePossibleEffects;

case DeclRefExprClass:
case ObjCIvarRefExprClass:
case PredefinedExprClass:
case IntegerLiteralClass:
case FixedPointLiteralClass:
case FloatingLiteralClass:
case ImaginaryLiteralClass:
case StringLiteralClass:
case CharacterLiteralClass:
case OffsetOfExprClass:
case ImplicitValueInitExprClass:
case UnaryExprOrTypeTraitExprClass:
case AddrLabelExprClass:
case GNUNullExprClass:
case ArrayInitIndexExprClass:
case NoInitExprClass:
case CXXBoolLiteralExprClass:
case CXXNullPtrLiteralExprClass:
case CXXThisExprClass:
case CXXScalarValueInitExprClass:
case TypeTraitExprClass:
case ArrayTypeTraitExprClass:
case ExpressionTraitExprClass:
case CXXNoexceptExprClass:
case SizeOfPackExprClass:
case ObjCStringLiteralClass:
case ObjCEncodeExprClass:
case ObjCBoolLiteralExprClass:
case ObjCAvailabilityCheckExprClass:
case CXXUuidofExprClass:
case OpaqueValueExprClass:
case SourceLocExprClass:
case ConceptSpecializationExprClass:
case RequiresExprClass:
case SYCLUniqueStableNameExprClass:
  // These never have a side-effect.
  return false;

case ConstantExprClass:
  // FIXME: Move this into the "return false;" block above.
  return cast<ConstantExpr>(this)->getSubExpr()->HasSideEffects(
      Ctx, IncludePossibleEffects);

case CallExprClass:
case CXXOperatorCallExprClass:
case CXXMemberCallExprClass:
case CUDAKernelCallExprClass:
case UserDefinedLiteralClass: {
  // We don't know a call definitely has side effects, except for calls
  // to pure/const functions that definitely don't.
  // If the call itself is considered side-effect free, check the operands.
  const Decl *FD = cast<CallExpr>(this)->getCalleeDecl();
  bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
  if (IsPure || !IncludePossibleEffects)
    break;
  return true;
}

case BlockExprClass:
case CXXBindTemporaryExprClass:
  if (!IncludePossibleEffects)
    break;
  return true;

case MSPropertyRefExprClass:
case MSPropertySubscriptExprClass:
case CompoundAssignOperatorClass:
case VAArgExprClass:
case AtomicExprClass:
case CXXThrowExprClass:
case CXXNewExprClass:
case CXXDeleteExprClass:
case CoawaitExprClass:
case DependentCoawaitExprClass:
case CoyieldExprClass:
  // These always have a side-effect.
  return true;

case StmtExprClass: {
  // StmtExprs have a side-effect if any substatement does.
  SideEffectFinder Finder(Ctx, IncludePossibleEffects);
  Finder.Visit(cast<StmtExpr>(this)->getSubStmt());
  return Finder.hasSideEffects();
}

case ExprWithCleanupsClass:
  if (IncludePossibleEffects)
    if (cast<ExprWithCleanups>(this)->cleanupsHaveSideEffects())
      return true;
  break;

case ParenExprClass:
case ArraySubscriptExprClass:
case MatrixSubscriptExprClass:
case OMPArraySectionExprClass:
case OMPArrayShapingExprClass:
case OMPIteratorExprClass:
case MemberExprClass:
case ConditionalOperatorClass:
case BinaryConditionalOperatorClass:
case CompoundLiteralExprClass:
case ExtVectorElementExprClass:
case DesignatedInitExprClass:
case DesignatedInitUpdateExprClass:
case ArrayInitLoopExprClass:
case ParenListExprClass:
case CXXPseudoDestructorExprClass:
case CXXRewrittenBinaryOperatorClass:
case CXXStdInitializerListExprClass:
case SubstNonTypeTemplateParmExprClass:
case MaterializeTemporaryExprClass:
case ShuffleVectorExprClass:
case ConvertVectorExprClass:
case AsTypeExprClass:
  // These have a side-effect if any subexpression does.
  break;

case UnaryOperatorClass:
  if (cast<UnaryOperator>(this)->isIncrementDecrementOp())
    return true;
  break;

case BinaryOperatorClass:
  if (cast<BinaryOperator>(this)->isAssignmentOp())
    return true;
  break;

case InitListExprClass:
  // FIXME: The children for an InitListExpr doesn't include the array filler.
  if (const Expr *E = cast<InitListExpr>(this)->getArrayFiller())
    if (E->HasSideEffects(Ctx, IncludePossibleEffects))
      return true;
  break;

case GenericSelectionExprClass:
  return cast<GenericSelectionExpr>(this)->getResultExpr()->
      HasSideEffects(Ctx, IncludePossibleEffects);

case ChooseExprClass:
  return cast<ChooseExpr>(this)->getChosenSubExpr()->HasSideEffects(
      Ctx, IncludePossibleEffects);

case CXXDefaultArgExprClass:
  return cast<CXXDefaultArgExpr>(this)->getExpr()->HasSideEffects(
      Ctx, IncludePossibleEffects);

case CXXDefaultInitExprClass: {
  const FieldDecl *FD = cast<CXXDefaultInitExpr>(this)->getField();
  if (const Expr *E = FD->getInClassInitializer())
    return E->HasSideEffects(Ctx, IncludePossibleEffects);
  // If we've not yet parsed the initializer, assume it has side-effects.
  return true;
}

case CXXDynamicCastExprClass: {
  // A dynamic_cast expression has side-effects if it can throw.
  const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(this);
  if (DCE->getTypeAsWritten()->isReferenceType() &&
      DCE->getCastKind() == CK_Dynamic)
    return true;
  }
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case ImplicitCastExprClass:
case CStyleCastExprClass:
case CXXStaticCastExprClass:
case CXXReinterpretCastExprClass:
case CXXConstCastExprClass:
case CXXAddrspaceCastExprClass:
case CXXFunctionalCastExprClass:
case BuiltinBitCastExprClass: {
  // While volatile reads are side-effecting in both C and C++, we treat them
  // as having possible (not definite) side-effects. This allows idiomatic
  // code to behave without warning, such as sizeof(*v) for a volatile-
  // qualified pointer.
  if (!IncludePossibleEffects)
    break;

  const CastExpr *CE = cast<CastExpr>(this);
  if (CE->getCastKind() == CK_LValueToRValue &&
      CE->getSubExpr()->getType().isVolatileQualified())
    return true;
  break;
}

case CXXTypeidExprClass:
  // typeid might throw if its subexpression is potentially-evaluated, so has
  // side-effects in that case whether or not its subexpression does.
  return cast<CXXTypeidExpr>(this)->isPotentiallyEvaluated();

case CXXConstructExprClass:
case CXXTemporaryObjectExprClass: {
  const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
  if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
    return true;
  // A trivial constructor does not add any side-effects of its own. Just look
  // at its arguments.
  break;
}

case CXXInheritedCtorInitExprClass: {
  const auto *ICIE = cast<CXXInheritedCtorInitExpr>(this);
  if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
    return true;
  break;
}

case LambdaExprClass: {
  const LambdaExpr *LE = cast<LambdaExpr>(this);
  for (Expr *E : LE->capture_inits())
    if (E && E->HasSideEffects(Ctx, IncludePossibleEffects))
      return true;
  return false;
}

case PseudoObjectExprClass: {
  // Only look for side-effects in the semantic form, and look past
  // OpaqueValueExpr bindings in that form.
  const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
  for (PseudoObjectExpr::const_semantics_iterator I = PO->semantics_begin(),
                                                  E = PO->semantics_end();
       I != E; ++I) {
    const Expr *Subexpr = *I;
    if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Subexpr))
      Subexpr = OVE->getSourceExpr();
    if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
      return true;
  }
  return false;
}

case ObjCBoxedExprClass:
case ObjCArrayLiteralClass:
case ObjCDictionaryLiteralClass:
case ObjCSelectorExprClass:
case ObjCProtocolExprClass:
case ObjCIsaExprClass:
case ObjCIndirectCopyRestoreExprClass:
case ObjCSubscriptRefExprClass:
case ObjCBridgedCastExprClass:
case ObjCMessageExprClass:
case ObjCPropertyRefExprClass:
// FIXME: Classify these cases better.
  if (IncludePossibleEffects)
    return true;
  break;
}

// Recurse to children.
for (const Stmt *SubStmt : children())
  if (SubStmt &&
      cast<Expr>(SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
    return true;

return false;
3676}

3678FPOptions Expr::getFPFeaturesInEffect(const LangOptions &LO) const {
if (auto Call = dyn_cast<CallExpr>(this))
  return Call->getFPFeaturesInEffect(LO);
if (auto UO = dyn_cast<UnaryOperator>(this))
  return UO->getFPFeaturesInEffect(LO);
if (auto BO = dyn_cast<BinaryOperator>(this))
  return BO->getFPFeaturesInEffect(LO);
if (auto Cast = dyn_cast<CastExpr>(this))
  return Cast->getFPFeaturesInEffect(LO);
return FPOptions::defaultWithoutTrailingStorage(LO);
3688}

3690namespace {
/// Look for a call to a non-trivial function within an expression.
class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
{
  typedef ConstEvaluatedExprVisitor<NonTrivialCallFinder> Inherited;

  bool NonTrivial;

public:
  explicit NonTrivialCallFinder(const ASTContext &Context)
    : Inherited(Context), NonTrivial(false) { }

  bool hasNonTrivialCall() const { return NonTrivial; }

  void VisitCallExpr(const CallExpr *E) {
    if (const CXXMethodDecl *Method
        = dyn_cast_or_null<const CXXMethodDecl>(E->getCalleeDecl())) {
      if (Method->isTrivial()) {
        // Recurse to children of the call.
        Inherited::VisitStmt(E);
        return;
      }
    }

    NonTrivial = true;
  }

  void VisitCXXConstructExpr(const CXXConstructExpr *E) {
    if (E->getConstructor()->isTrivial()) {
      // Recurse to children of the call.
      Inherited::VisitStmt(E);
      return;
    }

    NonTrivial = true;
  }

  void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
    if (E->getTemporary()->getDestructor()->isTrivial()) {
      Inherited::VisitStmt(E);
      return;
    }

    NonTrivial = true;
  }
};
3736}

3738bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
NonTrivialCallFinder Finder(Ctx);
Finder.Visit(this);
return Finder.hasNonTrivialCall();
3742}

3744/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
3745/// pointer constant or not, as well as the specific kind of constant detected.
3746/// Null pointer constants can be integer constant expressions with the
3747/// value zero, casts of zero to void*, nullptr (C++0X), or __null
3748/// (a GNU extension).
3749Expr::NullPointerConstantKind
3750Expr::isNullPointerConstant(ASTContext &Ctx,
                          NullPointerConstantValueDependence NPC) const {
if (isValueDependent() &&
    (!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
  // Error-dependent expr should never be a null pointer.
  if (containsErrors())
    return NPCK_NotNull;
  switch (NPC) {
  case NPC_NeverValueDependent:
    llvm_unreachable("Unexpected value dependent expression!")__builtin_unreachable();
  case NPC_ValueDependentIsNull:
    if (isTypeDependent() || getType()->isIntegralType(Ctx))
      return NPCK_ZeroExpression;
    else
      return NPCK_NotNull;

  case NPC_ValueDependentIsNotNull:
    return NPCK_NotNull;
  }
}

// Strip off a cast to void*, if it exists. Except in C++.
if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
  if (!Ctx.getLangOpts().CPlusPlus) {
    // Check that it is a cast to void*.
    if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
      QualType Pointee = PT->getPointeeType();
      Qualifiers Qs = Pointee.getQualifiers();
      // Only (void*)0 or equivalent are treated as nullptr. If pointee type
      // has non-default address space it is not treated as nullptr.
      // (__generic void*)0 in OpenCL 2.0 should not be treated as nullptr
      // since it cannot be assigned to a pointer to constant address space.
      if ((Ctx.getLangOpts().OpenCLVersion >= 200 &&
           Pointee.getAddressSpace() == LangAS::opencl_generic) ||
          (Ctx.getLangOpts().OpenCL &&
           Ctx.getLangOpts().OpenCLVersion < 200 &&
           Pointee.getAddressSpace() == LangAS::opencl_private))
        Qs.removeAddressSpace();

      if (Pointee->isVoidType() && Qs.empty() && // to void*
          CE->getSubExpr()->getType()->isIntegerType()) // from int
        return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
    }
  }
} else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
  // Ignore the ImplicitCastExpr type entirely.
  return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
  // Accept ((void*)0) as a null pointer constant, as many other
  // implementations do.
  return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const GenericSelectionExpr *GE =
             dyn_cast<GenericSelectionExpr>(this)) {
  if (GE->isResultDependent())
    return NPCK_NotNull;
  return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(this)) {
  if (CE->isConditionDependent())
    return NPCK_NotNull;
  return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const CXXDefaultArgExpr *DefaultArg
             = dyn_cast<CXXDefaultArgExpr>(this)) {
  // See through default argument expressions.
  return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const CXXDefaultInitExpr *DefaultInit
             = dyn_cast<CXXDefaultInitExpr>(this)) {
  // See through default initializer expressions.
  return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
} else if (isa<GNUNullExpr>(this)) {
  // The GNU __null extension is always a null pointer constant.
  return NPCK_GNUNull;
} else if (const MaterializeTemporaryExpr *M
                                 = dyn_cast<MaterializeTemporaryExpr>(this)) {
  return M->getSubExpr()->isNullPointerConstant(Ctx, NPC);
} else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) {
  if (const Expr *Source = OVE->getSourceExpr())
    return Source->isNullPointerConstant(Ctx, NPC);
}

// If the expression has no type information, it cannot be a null pointer
// constant.
if (getType().isNull())
  return NPCK_NotNull;

// C++11 nullptr_t is always a null pointer constant.
if (getType()->isNullPtrType())
  return NPCK_CXX11_nullptr;

if (const RecordType *UT = getType()->getAsUnionType())
  if (!Ctx.getLangOpts().CPlusPlus11 &&
      UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
    if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){
      const Expr *InitExpr = CLE->getInitializer();
      if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr))
        return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC);
    }
// This expression must be an integer type.
if (!getType()->isIntegerType() ||
    (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
  return NPCK_NotNull;

if (Ctx.getLangOpts().CPlusPlus11) {
  // C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
  // value zero or a prvalue of type std::nullptr_t.
  // Microsoft mode permits C++98 rules reflecting MSVC behavior.
  const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(this);
  if (Lit && !Lit->getValue())
    return NPCK_ZeroLiteral;
  if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
    return NPCK_NotNull;
} else {
  // If we have an integer constant expression, we need to *evaluate* it and
  // test for the value 0.
  if (!isIntegerConstantExpr(Ctx))
    return NPCK_NotNull;
}

if (EvaluateKnownConstInt(Ctx) != 0)
  return NPCK_NotNull;

if (isa<IntegerLiteral>(this))
  return NPCK_ZeroLiteral;
return NPCK_ZeroExpression;
3873}

3875/// If this expression is an l-value for an Objective C
3876/// property, find the underlying property reference expression.
3877const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
const Expr *E = this;
while (true) {
  assert((E->isLValue() && E->getObjectKind() == OK_ObjCProperty) &&(static_cast<void> (0))
         "expression is not a property reference")(static_cast<void> (0));
  E = E->IgnoreParenCasts();
  if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
    if (BO->getOpcode() == BO_Comma) {
      E = BO->getRHS();
      continue;
    }
  }

  break;
}

return cast<ObjCPropertyRefExpr>(E);
3894}

3896bool Expr::isObjCSelfExpr() const {
const Expr *E = IgnoreParenImpCasts();

const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
if (!DRE)
  return false;

const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(DRE->getDecl());
if (!Param)
  return false;

const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Param->getDeclContext());
if (!M)
  return false;

return M->getSelfDecl() == Param;
3912}

3914FieldDecl *Expr::getSourceBitField() {
Expr *E = this->IgnoreParens();

while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (ICE->getCastKind() == CK_LValueToRValue ||
      (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp))
    E = ICE->getSubExpr()->IgnoreParens();
  else
    break;
}

if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
  if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
    if (Field->isBitField())
      return Field;

if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(E)) {
  FieldDecl *Ivar = IvarRef->getDecl();
  if (Ivar->isBitField())
    return Ivar;
}

if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) {
  if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
    if (Field->isBitField())
      return Field;

  if (BindingDecl *BD = dyn_cast<BindingDecl>(DeclRef->getDecl()))
    if (Expr *E = BD->getBinding())
      return E->getSourceBitField();
}

if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) {
  if (BinOp->isAssignmentOp() && BinOp->getLHS())
    return BinOp->getLHS()->getSourceBitField();

  if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
    return BinOp->getRHS()->getSourceBitField();
}

if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E))
  if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
    return UnOp->getSubExpr()->getSourceBitField();

return nullptr;
3959}

3961bool Expr::refersToVectorElement() const {
// FIXME: Why do we not just look at the ObjectKind here?
const Expr *E = this->IgnoreParens();

while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
  if (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp)
    E = ICE->getSubExpr()->IgnoreParens();
  else
    break;
}

if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
  return ASE->getBase()->getType()->isVectorType();

if (isa<ExtVectorElementExpr>(E))
  return true;

if (auto *DRE = dyn_cast<DeclRefExpr>(E))
  if (auto *BD = dyn_cast<BindingDecl>(DRE->getDecl()))
    if (auto *E = BD->getBinding())
      return E->refersToVectorElement();

return false;
3984}

3986bool Expr::refersToGlobalRegisterVar() const {
const Expr *E = this->IgnoreParenImpCasts();

if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
  if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
    if (VD->getStorageClass() == SC_Register &&
        VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
      return true;

return false;
3996}

3998bool Expr::isSameComparisonOperand(const Expr* E1, const Expr* E2) {
E1 = E1->IgnoreParens();
E2 = E2->IgnoreParens();

if (E1->getStmtClass() != E2->getStmtClass())
  return false;

switch (E1->getStmtClass()) {
  default:
    return false;
  case CXXThisExprClass:
    return true;
  case DeclRefExprClass: {
    // DeclRefExpr without an ImplicitCastExpr can happen for integral
    // template parameters.
    const auto *DRE1 = cast<DeclRefExpr>(E1);
    const auto *DRE2 = cast<DeclRefExpr>(E2);
    return DRE1->isPRValue() && DRE2->isPRValue() &&
           DRE1->getDecl() == DRE2->getDecl();
  }
  case ImplicitCastExprClass: {
    // Peel off implicit casts.
    while (true) {
      const auto *ICE1 = dyn_cast<ImplicitCastExpr>(E1);
      const auto *ICE2 = dyn_cast<ImplicitCastExpr>(E2);
      if (!ICE1 || !ICE2)
        return false;
      if (ICE1->getCastKind() != ICE2->getCastKind())
        return false;
      E1 = ICE1->getSubExpr()->IgnoreParens();
      E2 = ICE2->getSubExpr()->IgnoreParens();
      // The final cast must be one of these types.
      if (ICE1->getCastKind() == CK_LValueToRValue ||
          ICE1->getCastKind() == CK_ArrayToPointerDecay ||
          ICE1->getCastKind() == CK_FunctionToPointerDecay) {
        break;
      }
    }

    const auto *DRE1 = dyn_cast<DeclRefExpr>(E1);
    const auto *DRE2 = dyn_cast<DeclRefExpr>(E2);
    if (DRE1 && DRE2)
      return declaresSameEntity(DRE1->getDecl(), DRE2->getDecl());

    const auto *Ivar1 = dyn_cast<ObjCIvarRefExpr>(E1);
    const auto *Ivar2 = dyn_cast<ObjCIvarRefExpr>(E2);
    if (Ivar1 && Ivar2) {
      return Ivar1->isFreeIvar() && Ivar2->isFreeIvar() &&
             declaresSameEntity(Ivar1->getDecl(), Ivar2->getDecl());
    }

    const auto *Array1 = dyn_cast<ArraySubscriptExpr>(E1);
    const auto *Array2 = dyn_cast<ArraySubscriptExpr>(E2);
    if (Array1 && Array2) {
      if (!isSameComparisonOperand(Array1->getBase(), Array2->getBase()))
        return false;

      auto Idx1 = Array1->getIdx();
      auto Idx2 = Array2->getIdx();
      const auto Integer1 = dyn_cast<IntegerLiteral>(Idx1);
      const auto Integer2 = dyn_cast<IntegerLiteral>(Idx2);
      if (Integer1 && Integer2) {
        if (!llvm::APInt::isSameValue(Integer1->getValue(),
                                      Integer2->getValue()))
          return false;
      } else {
        if (!isSameComparisonOperand(Idx1, Idx2))
          return false;
      }

      return true;
    }

    // Walk the MemberExpr chain.
    while (isa<MemberExpr>(E1) && isa<MemberExpr>(E2)) {
      const auto *ME1 = cast<MemberExpr>(E1);
      const auto *ME2 = cast<MemberExpr>(E2);
      if (!declaresSameEntity(ME1->getMemberDecl(), ME2->getMemberDecl()))
        return false;
      if (const auto *D = dyn_cast<VarDecl>(ME1->getMemberDecl()))
        if (D->isStaticDataMember())
          return true;
      E1 = ME1->getBase()->IgnoreParenImpCasts();
      E2 = ME2->getBase()->IgnoreParenImpCasts();
    }

    if (isa<CXXThisExpr>(E1) && isa<CXXThisExpr>(E2))
      return true;

    // A static member variable can end the MemberExpr chain with either
    // a MemberExpr or a DeclRefExpr.
    auto getAnyDecl = [](const Expr *E) -> const ValueDecl * {
      if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
        return DRE->getDecl();
      if (const auto *ME = dyn_cast<MemberExpr>(E))
        return ME->getMemberDecl();
      return nullptr;
    };

    const ValueDecl *VD1 = getAnyDecl(E1);
    const ValueDecl *VD2 = getAnyDecl(E2);
    return declaresSameEntity(VD1, VD2);
  }
}
4102}

4104/// isArrow - Return true if the base expression is a pointer to vector,
4105/// return false if the base expression is a vector.
4106bool ExtVectorElementExpr::isArrow() const {
return getBase()->getType()->isPointerType();
4108}

4110unsigned ExtVectorElementExpr::getNumElements() const {
if (const VectorType *VT = getType()->getAs<VectorType>())
  return VT->getNumElements();
return 1;
4114}

4116/// containsDuplicateElements - Return true if any element access is repeated.
4117bool ExtVectorElementExpr::containsDuplicateElements() const {
// FIXME: Refactor this code to an accessor on the AST node which returns the
// "type" of component access, and share with code below and in Sema.
StringRef Comp = Accessor->getName();

// Halving swizzles do not contain duplicate elements.
if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
  return false;

// Advance past s-char prefix on hex swizzles.
if (Comp[0] == 's' || Comp[0] == 'S')
  Comp = Comp.substr(1);

for (unsigned i = 0, e = Comp.size(); i != e; ++i)
  if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos)
      return true;

return false;
4135}

4137/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
4138void ExtVectorElementExpr::getEncodedElementAccess(
  SmallVectorImpl<uint32_t> &Elts) const {
StringRef Comp = Accessor->getName();
bool isNumericAccessor = false;
if (Comp[0] == 's' || Comp[0] == 'S') {
  Comp = Comp.substr(1);
  isNumericAccessor = true;
}

bool isHi =   Comp == "hi";
bool isLo =   Comp == "lo";
bool isEven = Comp == "even";
bool isOdd  = Comp == "odd";

for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
  uint64_t Index;

  if (isHi)
    Index = e + i;
  else if (isLo)
    Index = i;
  else if (isEven)
    Index = 2 * i;
  else if (isOdd)
    Index = 2 * i + 1;
  else
    Index = ExtVectorType::getAccessorIdx(Comp[i], isNumericAccessor);

  Elts.push_back(Index);
}
4168}

4170ShuffleVectorExpr::ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr *> args,
                                   QualType Type, SourceLocation BLoc,
                                   SourceLocation RP)
  : Expr(ShuffleVectorExprClass, Type, VK_PRValue, OK_Ordinary),
    BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(args.size()) {
SubExprs = new (C) Stmt*[args.size()];
for (unsigned i = 0; i != args.size(); i++)
  SubExprs[i] = args[i];

setDependence(computeDependence(this));
4180}

4182void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
if (SubExprs) C.Deallocate(SubExprs);

this->NumExprs = Exprs.size();
SubExprs = new (C) Stmt*[NumExprs];
memcpy(SubExprs, Exprs.data(), sizeof(Expr *) * Exprs.size());
4188}

4190GenericSelectionExpr::GenericSelectionExpr(
  const ASTContext &, SourceLocation GenericLoc, Expr *ControllingExpr,
  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
  SourceLocation DefaultLoc, SourceLocation RParenLoc,
  bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
  : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
         AssocExprs[ResultIndex]->getValueKind(),
         AssocExprs[ResultIndex]->getObjectKind()),
    NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
    DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
assert(AssocTypes.size() == AssocExprs.size() &&(static_cast<void> (0))
       "Must have the same number of association expressions"(static_cast<void> (0))
       " and TypeSourceInfo!")(static_cast<void> (0));
assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!")(static_cast<void> (0));

GenericSelectionExprBits.GenericLoc = GenericLoc;
getTrailingObjects<Stmt *>()[ControllingIndex] = ControllingExpr;
std::copy(AssocExprs.begin(), AssocExprs.end(),
          getTrailingObjects<Stmt *>() + AssocExprStartIndex);
std::copy(AssocTypes.begin(), AssocTypes.end(),
          getTrailingObjects<TypeSourceInfo *>());

setDependence(computeDependence(this, ContainsUnexpandedParameterPack));
4213}

4215GenericSelectionExpr::GenericSelectionExpr(
  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
  SourceLocation DefaultLoc, SourceLocation RParenLoc,
  bool ContainsUnexpandedParameterPack)
  : Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
         OK_Ordinary),
    NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
    DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
assert(AssocTypes.size() == AssocExprs.size() &&(static_cast<void> (0))
       "Must have the same number of association expressions"(static_cast<void> (0))
       " and TypeSourceInfo!")(static_cast<void> (0));

GenericSelectionExprBits.GenericLoc = GenericLoc;
getTrailingObjects<Stmt *>()[ControllingIndex] = ControllingExpr;
std::copy(AssocExprs.begin(), AssocExprs.end(),
          getTrailingObjects<Stmt *>() + AssocExprStartIndex);
std::copy(AssocTypes.begin(), AssocTypes.end(),
          getTrailingObjects<TypeSourceInfo *>());

setDependence(computeDependence(this, ContainsUnexpandedParameterPack));
4236}

4238GenericSelectionExpr::GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs)
  : Expr(GenericSelectionExprClass, Empty), NumAssocs(NumAssocs) {}

4241GenericSelectionExpr *GenericSelectionExpr::Create(
  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
  SourceLocation DefaultLoc, SourceLocation RParenLoc,
  bool ContainsUnexpandedParameterPack, unsigned ResultIndex) {
unsigned NumAssocs = AssocExprs.size();
void *Mem = Context.Allocate(
    totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
    alignof(GenericSelectionExpr));
return new (Mem) GenericSelectionExpr(
    Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
    RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4253}

4255GenericSelectionExpr *GenericSelectionExpr::Create(
  const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
  ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
  SourceLocation DefaultLoc, SourceLocation RParenLoc,
  bool ContainsUnexpandedParameterPack) {
unsigned NumAssocs = AssocExprs.size();
void *Mem = Context.Allocate(
    totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
    alignof(GenericSelectionExpr));
return new (Mem) GenericSelectionExpr(
    Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
    RParenLoc, ContainsUnexpandedParameterPack);
4267}

4269GenericSelectionExpr *
4270GenericSelectionExpr::CreateEmpty(const ASTContext &Context,
                                unsigned NumAssocs) {
void *Mem = Context.Allocate(
    totalSizeToAlloc<Stmt *, TypeSourceInfo *>(1 + NumAssocs, NumAssocs),
    alignof(GenericSelectionExpr));
return new (Mem) GenericSelectionExpr(EmptyShell(), NumAssocs);
4276}

4278//===----------------------------------------------------------------------===//
4279//  DesignatedInitExpr
4280//===----------------------------------------------------------------------===//

4282IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
assert(Kind == FieldDesignator && "Only valid on a field designator")(static_cast<void> (0));
if (Field.NameOrField & 0x01)
  return reinterpret_cast<IdentifierInfo *>(Field.NameOrField & ~0x01);
return getField()->getIdentifier();
4287}

4289DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
                                     llvm::ArrayRef<Designator> Designators,
                                     SourceLocation EqualOrColonLoc,
                                     bool GNUSyntax,
                                     ArrayRef<Expr *> IndexExprs, Expr *Init)
  : Expr(DesignatedInitExprClass, Ty, Init->getValueKind(),
         Init->getObjectKind()),
    EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
    NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
this->Designators = new (C) Designator[NumDesignators];

// Record the initializer itself.
child_iterator Child = child_begin();
*Child++ = Init;

// Copy the designators and their subexpressions, computing
// value-dependence along the way.
unsigned IndexIdx = 0;
for (unsigned I = 0; I != NumDesignators; ++I) {
  this->Designators[I] = Designators[I];
  if (this->Designators[I].isArrayDesignator()) {
    // Copy the index expressions into permanent storage.
    *Child++ = IndexExprs[IndexIdx++];
  } else if (this->Designators[I].isArrayRangeDesignator()) {
    // Copy the start/end expressions into permanent storage.
    *Child++ = IndexExprs[IndexIdx++];
    *Child++ = IndexExprs[IndexIdx++];
  }
}

assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions")(static_cast<void> (0));
setDependence(computeDependence(this));
4321}

4323DesignatedInitExpr *
4324DesignatedInitExpr::Create(const ASTContext &C,
                         llvm::ArrayRef<Designator> Designators,
                         ArrayRef<Expr*> IndexExprs,
                         SourceLocation ColonOrEqualLoc,
                         bool UsesColonSyntax, Expr *Init) {
void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(IndexExprs.size() + 1),
                       alignof(DesignatedInitExpr));
return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
                                    ColonOrEqualLoc, UsesColonSyntax,
                                    IndexExprs, Init);
4334}

4336DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(const ASTContext &C,
                                                  unsigned NumIndexExprs) {
void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(NumIndexExprs + 1),
                       alignof(DesignatedInitExpr));
return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
4341}

4343void DesignatedInitExpr::setDesignators(const ASTContext &C,
                                      const Designator *Desigs,
                                      unsigned NumDesigs) {
Designators = new (C) Designator[NumDesigs];
NumDesignators = NumDesigs;
for (unsigned I = 0; I != NumDesigs; ++I)
  Designators[I] = Desigs[I];
4350}

4352SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
if (size() == 1)
  return DIE->getDesignator(0)->getSourceRange();
return SourceRange(DIE->getDesignator(0)->getBeginLoc(),
                   DIE->getDesignator(size() - 1)->getEndLoc());
4358}

4360SourceLocation DesignatedInitExpr::getBeginLoc() const {
SourceLocation StartLoc;
auto *DIE = const_cast<DesignatedInitExpr *>(this);
Designator &First = *DIE->getDesignator(0);
if (First.isFieldDesignator())
  StartLoc = GNUSyntax ? First.Field.FieldLoc : First.Field.DotLoc;
else
  StartLoc = First.ArrayOrRange.LBracketLoc;
return StartLoc;
4369}

4371SourceLocation DesignatedInitExpr::getEndLoc() const {
return getInit()->getEndLoc();
4373}

4375Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) const {
assert(D.Kind == Designator::ArrayDesignator && "Requires array designator")(static_cast<void> (0));
return getSubExpr(D.ArrayOrRange.Index + 1);
4378}

4380Expr *DesignatedInitExpr::getArrayRangeStart(const Designator &D) const {
assert(D.Kind == Designator::ArrayRangeDesignator &&(static_cast<void> (0))
       "Requires array range designator")(static_cast<void> (0));
return getSubExpr(D.ArrayOrRange.Index + 1);
4384}

4386Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator &D) const {
assert(D.Kind == Designator::ArrayRangeDesignator &&(static_cast<void> (0))
       "Requires array range designator")(static_cast<void> (0));
return getSubExpr(D.ArrayOrRange.Index + 2);
4390}

4392/// Replaces the designator at index @p Idx with the series
4393/// of designators in [First, Last).
4394void DesignatedInitExpr::ExpandDesignator(const ASTContext &C, unsigned Idx,
                                        const Designator *First,
                                        const Designator *Last) {
unsigned NumNewDesignators = Last - First;
if (NumNewDesignators == 0) {
  std::copy_backward(Designators + Idx + 1,
                     Designators + NumDesignators,
                     Designators + Idx);
  --NumNewDesignators;
  return;
}
if (NumNewDesignators == 1) {
  Designators[Idx] = *First;
  return;
}

Designator *NewDesignators
  = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
std::copy(Designators, Designators + Idx, NewDesignators);
std::copy(First, Last, NewDesignators + Idx);
std::copy(Designators + Idx + 1, Designators + NumDesignators,
          NewDesignators + Idx + NumNewDesignators);
Designators = NewDesignators;
NumDesignators = NumDesignators - 1 + NumNewDesignators;
4418}

4420DesignatedInitUpdateExpr::DesignatedInitUpdateExpr(const ASTContext &C,
                                                 SourceLocation lBraceLoc,
                                                 Expr *baseExpr,
                                                 SourceLocation rBraceLoc)
  : Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_PRValue,
         OK_Ordinary) {
BaseAndUpdaterExprs[0] = baseExpr;

InitListExpr *ILE = new (C) InitListExpr(C, lBraceLoc, None, rBraceLoc);
ILE->setType(baseExpr->getType());
BaseAndUpdaterExprs[1] = ILE;

// FIXME: this is wrong, set it correctly.
setDependence(ExprDependence::None);
4434}

4436SourceLocation DesignatedInitUpdateExpr::getBeginLoc() const {
return getBase()->getBeginLoc();
4438}

4440SourceLocation DesignatedInitUpdateExpr::getEndLoc() const {
return getBase()->getEndLoc();
4442}

4444ParenListExpr::ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
                           SourceLocation RParenLoc)
  : Expr(ParenListExprClass, QualType(), VK_PRValue, OK_Ordinary),
    LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
ParenListExprBits.NumExprs = Exprs.size();

for (unsigned I = 0, N = Exprs.size(); I != N; ++I)
  getTrailingObjects<Stmt *>()[I] = Exprs[I];
setDependence(computeDependence(this));
4453}

4455ParenListExpr::ParenListExpr(EmptyShell Empty, unsigned NumExprs)
  : Expr(ParenListExprClass, Empty) {
ParenListExprBits.NumExprs = NumExprs;
4458}

4460ParenListExpr *ParenListExpr::Create(const ASTContext &Ctx,
                                   SourceLocation LParenLoc,
                                   ArrayRef<Expr *> Exprs,
                                   SourceLocation RParenLoc) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<Stmt *>(Exprs.size()),
                         alignof(ParenListExpr));
return new (Mem) ParenListExpr(LParenLoc, Exprs, RParenLoc);
4467}

4469ParenListExpr *ParenListExpr::CreateEmpty(const ASTContext &Ctx,
                                        unsigned NumExprs) {
void *Mem =
    Ctx.Allocate(totalSizeToAlloc<Stmt *>(NumExprs), alignof(ParenListExpr));
return new (Mem) ParenListExpr(EmptyShell(), NumExprs);
4474}

4476BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
                             Opcode opc, QualType ResTy, ExprValueKind VK,
                             ExprObjectKind OK, SourceLocation opLoc,
                             FPOptionsOverride FPFeatures)
  : Expr(BinaryOperatorClass, ResTy, VK, OK) {
BinaryOperatorBits.Opc = opc;
assert(!isCompoundAssignmentOp() &&(static_cast<void> (0))
       "Use CompoundAssignOperator for compound assignments")(static_cast<void> (0));
BinaryOperatorBits.OpLoc = opLoc;
SubExprs[LHS] = lhs;
SubExprs[RHS] = rhs;
BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
if (hasStoredFPFeatures())
  setStoredFPFeatures(FPFeatures);
setDependence(computeDependence(this));
4491}

4493BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
                             Opcode opc, QualType ResTy, ExprValueKind VK,
                             ExprObjectKind OK, SourceLocation opLoc,
                             FPOptionsOverride FPFeatures, bool dead2)
  : Expr(CompoundAssignOperatorClass, ResTy, VK, OK) {
BinaryOperatorBits.Opc = opc;
assert(isCompoundAssignmentOp() &&(static_cast<void> (0))
       "Use CompoundAssignOperator for compound assignments")(static_cast<void> (0));
BinaryOperatorBits.OpLoc = opLoc;
SubExprs[LHS] = lhs;
SubExprs[RHS] = rhs;
BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
if (hasStoredFPFeatures())
  setStoredFPFeatures(FPFeatures);
setDependence(computeDependence(this));
4508}

4510BinaryOperator *BinaryOperator::CreateEmpty(const ASTContext &C,
                                          bool HasFPFeatures) {
unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
void *Mem =
    C.Allocate(sizeof(BinaryOperator) + Extra, alignof(BinaryOperator));
return new (Mem) BinaryOperator(EmptyShell());
4516}

4518BinaryOperator *BinaryOperator::Create(const ASTContext &C, Expr *lhs,
                                     Expr *rhs, Opcode opc, QualType ResTy,
                                     ExprValueKind VK, ExprObjectKind OK,
                                     SourceLocation opLoc,
                                     FPOptionsOverride FPFeatures) {
bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
void *Mem =
    C.Allocate(sizeof(BinaryOperator) + Extra, alignof(BinaryOperator));
return new (Mem)
    BinaryOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures);
4529}

4531CompoundAssignOperator *
4532CompoundAssignOperator::CreateEmpty(const ASTContext &C, bool HasFPFeatures) {
unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
void *Mem = C.Allocate(sizeof(CompoundAssignOperator) + Extra,
                       alignof(CompoundAssignOperator));
return new (Mem) CompoundAssignOperator(C, EmptyShell(), HasFPFeatures);
4537}

4539CompoundAssignOperator *
4540CompoundAssignOperator::Create(const ASTContext &C, Expr *lhs, Expr *rhs,
                             Opcode opc, QualType ResTy, ExprValueKind VK,
                             ExprObjectKind OK, SourceLocation opLoc,
                             FPOptionsOverride FPFeatures,
                             QualType CompLHSType, QualType CompResultType) {
bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
void *Mem = C.Allocate(sizeof(CompoundAssignOperator) + Extra,
                       alignof(CompoundAssignOperator));
return new (Mem)
    CompoundAssignOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures,
                           CompLHSType, CompResultType);
4552}

4554UnaryOperator *UnaryOperator::CreateEmpty(const ASTContext &C,
                                        bool hasFPFeatures) {
void *Mem = C.Allocate(totalSizeToAlloc<FPOptionsOverride>(hasFPFeatures),
                       alignof(UnaryOperator));
return new (Mem) UnaryOperator(hasFPFeatures, EmptyShell());
4559}

4561UnaryOperator::UnaryOperator(const ASTContext &Ctx, Expr *input, Opcode opc,
                           QualType type, ExprValueKind VK, ExprObjectKind OK,
                           SourceLocation l, bool CanOverflow,
                           FPOptionsOverride FPFeatures)
  : Expr(UnaryOperatorClass, type, VK, OK), Val(input) {
UnaryOperatorBits.Opc = opc;
UnaryOperatorBits.CanOverflow = CanOverflow;
UnaryOperatorBits.Loc = l;
UnaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
if (hasStoredFPFeatures())
  setStoredFPFeatures(FPFeatures);
setDependence(computeDependence(this, Ctx));
4573}

4575UnaryOperator *UnaryOperator::Create(const ASTContext &C, Expr *input,
                                   Opcode opc, QualType type,
                                   ExprValueKind VK, ExprObjectKind OK,
                                   SourceLocation l, bool CanOverflow,
                                   FPOptionsOverride FPFeatures) {
bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
unsigned Size = totalSizeToAlloc<FPOptionsOverride>(HasFPFeatures);
void *Mem = C.Allocate(Size, alignof(UnaryOperator));
return new (Mem)
    UnaryOperator(C, input, opc, type, VK, OK, l, CanOverflow, FPFeatures);
4585}

4587const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e))
  e = ewc->getSubExpr();
if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e))
  e = m->getSubExpr();
e = cast<CXXConstructExpr>(e)->getArg(0);
while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
  e = ice->getSubExpr();
return cast<OpaqueValueExpr>(e);
4596}

4598PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &Context,
                                         EmptyShell sh,
                                         unsigned numSemanticExprs) {
void *buffer =
    Context.Allocate(totalSizeToAlloc<Expr *>(1 + numSemanticExprs),
                     alignof(PseudoObjectExpr));
return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
4605}

4607PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
: Expr(PseudoObjectExprClass, shell) {
PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
4610}

4612PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &C, Expr *syntax,
                                         ArrayRef<Expr*> semantics,
                                         unsigned resultIndex) {
assert(syntax && "no syntactic expression!")(static_cast<void> (0));
assert(semantics.size() && "no semantic expressions!")(static_cast<void> (0));

QualType type;
ExprValueKind VK;
if (resultIndex == NoResult) {
  type = C.VoidTy;
  VK = VK_PRValue;
} else {
  assert(resultIndex < semantics.size())(static_cast<void> (0));
  type = semantics[resultIndex]->getType();
  VK = semantics[resultIndex]->getValueKind();
  assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary)(static_cast<void> (0));
}

void *buffer = C.Allocate(totalSizeToAlloc<Expr *>(semantics.size() + 1),
                          alignof(PseudoObjectExpr));
return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
                                    resultIndex);
4634}

4636PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
                                 Expr *syntax, ArrayRef<Expr *> semantics,
                                 unsigned resultIndex)
  : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary) {
PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
PseudoObjectExprBits.ResultIndex = resultIndex + 1;

for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) {
  Expr *E = (i == 0 ? syntax : semantics[i-1]);
  getSubExprsBuffer()[i] = E;

  if (isa<OpaqueValueExpr>(E))
    assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != nullptr &&(static_cast<void> (0))
           "opaque-value semantic expressions for pseudo-object "(static_cast<void> (0))
           "operations must have sources")(static_cast<void> (0));
}

setDependence(computeDependence(this));
4654}

4656//===----------------------------------------------------------------------===//
4657//  Child Iterators for iterating over subexpressions/substatements
4658//===----------------------------------------------------------------------===//

4660// UnaryExprOrTypeTraitExpr
4661Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
const_child_range CCR =
    const_cast<const UnaryExprOrTypeTraitExpr *>(this)->children();
return child_range(cast_away_const(CCR.begin()), cast_away_const(CCR.end()));
4665}

4667Stmt::const_child_range UnaryExprOrTypeTraitExpr::children() const {
// If this is of a type and the type is a VLA type (and not a typedef), the
// size expression of the VLA needs to be treated as an executable expression.
// Why isn't this weirdness documented better in StmtIterator?
if (isArgumentType()) {
  if (const VariableArrayType *T =
          dyn_cast<VariableArrayType>(getArgumentType().getTypePtr()))
    return const_child_range(const_child_iterator(T), const_child_iterator());
  return const_child_range(const_child_iterator(), const_child_iterator());
}
return const_child_range(&Argument.Ex, &Argument.Ex + 1);
4678}

4680AtomicExpr::AtomicExpr(SourceLocation BLoc, ArrayRef<Expr *> args, QualType t,
                     AtomicOp op, SourceLocation RP)
  : Expr(AtomicExprClass, t, VK_PRValue, OK_Ordinary),
    NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) {
assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions")(static_cast<void> (0));
for (unsigned i = 0; i != args.size(); i++)
  SubExprs[i] = args[i];
setDependence(computeDependence(this));
4688}

4690unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) {
switch (Op) {
case AO__c11_atomic_init:
case AO__opencl_atomic_init:
case AO__c11_atomic_load:
case AO__atomic_load_n:
  return 2;

case AO__opencl_atomic_load:
case AO__c11_atomic_store:
case AO__c11_atomic_exchange:
case AO__atomic_load:
case AO__atomic_store:
case AO__atomic_store_n:
case AO__atomic_exchange_n:
case AO__c11_atomic_fetch_add:
case AO__c11_atomic_fetch_sub:
case AO__c11_atomic_fetch_and:
case AO__c11_atomic_fetch_or:
case AO__c11_atomic_fetch_xor:
case AO__c11_atomic_fetch_max:
case AO__c11_atomic_fetch_min:
case AO__atomic_fetch_add:
case AO__atomic_fetch_sub:
case AO__atomic_fetch_and:
case AO__atomic_fetch_or:
case AO__atomic_fetch_xor:
case AO__atomic_fetch_nand:
case AO__atomic_add_fetch:
case AO__atomic_sub_fetch:
case AO__atomic_and_fetch:
case AO__atomic_or_fetch:
case AO__atomic_xor_fetch:
case AO__atomic_nand_fetch:
case AO__atomic_min_fetch:
case AO__atomic_max_fetch:
case AO__atomic_fetch_min:
case AO__atomic_fetch_max:
  return 3;

case AO__opencl_atomic_store:
case AO__opencl_atomic_exchange:
case AO__opencl_atomic_fetch_add:
case AO__opencl_atomic_fetch_sub:
case AO__opencl_atomic_fetch_and:
case AO__opencl_atomic_fetch_or:
case AO__opencl_atomic_fetch_xor:
case AO__opencl_atomic_fetch_min:
case AO__opencl_atomic_fetch_max:
case AO__atomic_exchange:
  return 4;

case AO__c11_atomic_compare_exchange_strong:
case AO__c11_atomic_compare_exchange_weak:
  return 5;

case AO__opencl_atomic_compare_exchange_strong:
case AO__opencl_atomic_compare_exchange_weak:
case AO__atomic_compare_exchange:
case AO__atomic_compare_exchange_n:
  return 6;
}
llvm_unreachable("unknown atomic op")__builtin_unreachable();
4753}

4755QualType AtomicExpr::getValueType() const {
auto T = getPtr()->getType()->castAs<PointerType>()->getPointeeType();
if (auto AT = T->getAs<AtomicType>())
  return AT->getValueType();
return T;
4760}

4762QualType OMPArraySectionExpr::getBaseOriginalType(const Expr *Base) {
unsigned ArraySectionCount = 0;
while (auto *OASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParens())) {
  Base = OASE->getBase();
  ++ArraySectionCount;
}
while (auto *ASE =
           dyn_cast<ArraySubscriptExpr>(Base->IgnoreParenImpCasts())) {
  Base = ASE->getBase();
  ++ArraySectionCount;
}
Base = Base->IgnoreParenImpCasts();
auto OriginalTy = Base->getType();
if (auto *DRE = dyn_cast<DeclRefExpr>(Base))
  if (auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
    OriginalTy = PVD->getOriginalType().getNonReferenceType();

for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
  if (OriginalTy->isAnyPointerType())
    OriginalTy = OriginalTy->getPointeeType();
  else {
    assert (OriginalTy->isArrayType())(static_cast<void> (0));
    OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
  }
}
return OriginalTy;
4788}

4790RecoveryExpr::RecoveryExpr(ASTContext &Ctx, QualType T, SourceLocation BeginLoc,
                         SourceLocation EndLoc, ArrayRef<Expr *> SubExprs)
  : Expr(RecoveryExprClass, T.getNonReferenceType(),
         T->isDependentType() ? VK_LValue : getValueKindForType(T),
         OK_Ordinary),
    BeginLoc(BeginLoc), EndLoc(EndLoc), NumExprs(SubExprs.size()) {
assert(!T.isNull())(static_cast<void> (0));
assert(llvm::all_of(SubExprs, [](Expr* E) { return E != nullptr; }))(static_cast<void> (0));

llvm::copy(SubExprs, getTrailingObjects<Expr *>());
setDependence(computeDependence(this));
4801}

4803RecoveryExpr *RecoveryExpr::Create(ASTContext &Ctx, QualType T,
                                 SourceLocation BeginLoc,
                                 SourceLocation EndLoc,
                                 ArrayRef<Expr *> SubExprs) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<Expr *>(SubExprs.size()),
                         alignof(RecoveryExpr));
return new (Mem) RecoveryExpr(Ctx, T, BeginLoc, EndLoc, SubExprs);
4810}

4812RecoveryExpr *RecoveryExpr::CreateEmpty(ASTContext &Ctx, unsigned NumSubExprs) {
void *Mem = Ctx.Allocate(totalSizeToAlloc<Expr *>(NumSubExprs),
                         alignof(RecoveryExpr));
return new (Mem) RecoveryExpr(EmptyShell(), NumSubExprs);
4816}

4818void OMPArrayShapingExpr::setDimensions(ArrayRef<Expr *> Dims) {
assert((static_cast<void> (0))
    NumDims == Dims.size() &&(static_cast<void> (0))
    "Preallocated number of dimensions is different from the provided one.")(static_cast<void> (0));
llvm::copy(Dims, getTrailingObjects<Expr *>());
4823}

4825void OMPArrayShapingExpr::setBracketsRanges(ArrayRef<SourceRange> BR) {
assert((static_cast<void> (0))
    NumDims == BR.size() &&(static_cast<void> (0))
    "Preallocated number of dimensions is different from the provided one.")(static_cast<void> (0));
llvm::copy(BR, getTrailingObjects<SourceRange>());
4830}

4832OMPArrayShapingExpr::OMPArrayShapingExpr(QualType ExprTy, Expr *Op,
                                       SourceLocation L, SourceLocation R,
                                       ArrayRef<Expr *> Dims)
  : Expr(OMPArrayShapingExprClass, ExprTy, VK_LValue, OK_Ordinary), LPLoc(L),
    RPLoc(R), NumDims(Dims.size()) {
setBase(Op);
setDimensions(Dims);
setDependence(computeDependence(this));
4840}

4842OMPArrayShapingExpr *
4843OMPArrayShapingExpr::Create(const ASTContext &Context, QualType T, Expr *Op,
                          SourceLocation L, SourceLocation R,
                          ArrayRef<Expr *> Dims,
                          ArrayRef<SourceRange> BracketRanges) {
assert(Dims.size() == BracketRanges.size() &&(static_cast<void> (0))
       "Different number of dimensions and brackets ranges.")(static_cast<void> (0));
void *Mem = Context.Allocate(
    totalSizeToAlloc<Expr *, SourceRange>(Dims.size() + 1, Dims.size()),
    alignof(OMPArrayShapingExpr));
auto *E = new (Mem) OMPArrayShapingExpr(T, Op, L, R, Dims);
E->setBracketsRanges(BracketRanges);
return E;
4855}

4857OMPArrayShapingExpr *OMPArrayShapingExpr::CreateEmpty(const ASTContext &Context,
                                                    unsigned NumDims) {
void *Mem = Context.Allocate(
    totalSizeToAlloc<Expr *, SourceRange>(NumDims + 1, NumDims),
    alignof(OMPArrayShapingExpr));
return new (Mem) OMPArrayShapingExpr(EmptyShell(), NumDims);
4863}

4865void OMPIteratorExpr::setIteratorDeclaration(unsigned I, Decl *D) {
assert(I < NumIterators &&(static_cast<void> (0))
       "Idx is greater or equal the number of iterators definitions.")(static_cast<void> (0));
getTrailingObjects<Decl *>()[I] = D;
4869}

4871void OMPIteratorExpr::setAssignmentLoc(unsigned I, SourceLocation Loc) {
assert(I < NumIterators &&(static_cast<void> (0))
       "Idx is greater or equal the number of iterators definitions.")(static_cast<void> (0));
getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::AssignLoc)] = Loc;
4877}

4879void OMPIteratorExpr::setIteratorRange(unsigned I, Expr *Begin,
                                     SourceLocation ColonLoc, Expr *End,
                                     SourceLocation SecondColonLoc,
                                     Expr *Step) {
assert(I < NumIterators &&(static_cast<void> (0))
       "Idx is greater or equal the number of iterators definitions.")(static_cast<void> (0));
getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
                             static_cast<int>(RangeExprOffset::Begin)] =
    Begin;
getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
                             static_cast<int>(RangeExprOffset::End)] = End;
getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
                             static_cast<int>(RangeExprOffset::Step)] = Step;
getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::FirstColonLoc)] =
    ColonLoc;
getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::SecondColonLoc)] =
    SecondColonLoc;
4900}

4902Decl *OMPIteratorExpr::getIteratorDecl(unsigned I) {
return getTrailingObjects<Decl *>()[I];
4904}

4906OMPIteratorExpr::IteratorRange OMPIteratorExpr::getIteratorRange(unsigned I) {
IteratorRange Res;
Res.Begin =
    getTrailingObjects<Expr *>()[I * static_cast<int>(
                                         RangeExprOffset::Total) +
                                 static_cast<int>(RangeExprOffset::Begin)];
Res.End =
    getTrailingObjects<Expr *>()[I * static_cast<int>(
                                         RangeExprOffset::Total) +
                                 static_cast<int>(RangeExprOffset::End)];
Res.Step =
    getTrailingObjects<Expr *>()[I * static_cast<int>(
                                         RangeExprOffset::Total) +
                                 static_cast<int>(RangeExprOffset::Step)];
return Res;
4921}

4923SourceLocation OMPIteratorExpr::getAssignLoc(unsigned I) const {
return getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::AssignLoc)];
4927}

4929SourceLocation OMPIteratorExpr::getColonLoc(unsigned I) const {
return getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::FirstColonLoc)];
4933}

4935SourceLocation OMPIteratorExpr::getSecondColonLoc(unsigned I) const {
return getTrailingObjects<
    SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
                      static_cast<int>(RangeLocOffset::SecondColonLoc)];
4939}

4941void OMPIteratorExpr::setHelper(unsigned I, const OMPIteratorHelperData &D) {
getTrailingObjects<OMPIteratorHelperData>()[I] = D;
4943}

4945OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) {
return getTrailingObjects<OMPIteratorHelperData>()[I];
4947}

4949const OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) const {
return getTrailingObjects<OMPIteratorHelperData>()[I];
4951}

4953OMPIteratorExpr::OMPIteratorExpr(
  QualType ExprTy, SourceLocation IteratorKwLoc, SourceLocation L,
  SourceLocation R, ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
  ArrayRef<OMPIteratorHelperData> Helpers)
  : Expr(OMPIteratorExprClass, ExprTy, VK_LValue, OK_Ordinary),
    IteratorKwLoc(IteratorKwLoc), LPLoc(L), RPLoc(R),
    NumIterators(Data.size()) {
for (unsigned I = 0, E = Data.size(); I < E; ++I) {
  const IteratorDefinition &D = Data[I];
  setIteratorDeclaration(I, D.IteratorDecl);
  setAssignmentLoc(I, D.AssignmentLoc);
  setIteratorRange(I, D.Range.Begin, D.ColonLoc, D.Range.End,
                   D.SecondColonLoc, D.Range.Step);
  setHelper(I, Helpers[I]);
}
setDependence(computeDependence(this));
4969}

4971OMPIteratorExpr *
4972OMPIteratorExpr::Create(const ASTContext &Context, QualType T,
                      SourceLocation IteratorKwLoc, SourceLocation L,
                      SourceLocation R,
                      ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
                      ArrayRef<OMPIteratorHelperData> Helpers) {
assert(Data.size() == Helpers.size() &&(static_cast<void> (0))
       "Data and helpers must have the same size.")(static_cast<void> (0));
void *Mem = Context.Allocate(
    totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
        Data.size(), Data.size() * static_cast<int>(RangeExprOffset::Total),
        Data.size() * static_cast<int>(RangeLocOffset::Total),
        Helpers.size()),
    alignof(OMPIteratorExpr));
return new (Mem) OMPIteratorExpr(T, IteratorKwLoc, L, R, Data, Helpers);
4986}

4988OMPIteratorExpr *OMPIteratorExpr::CreateEmpty(const ASTContext &Context,
                                            unsigned NumIterators) {
void *Mem = Context.Allocate(
    totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
        NumIterators, NumIterators * static_cast<int>(RangeExprOffset::Total),
        NumIterators * static_cast<int>(RangeLocOffset::Total), NumIterators),
    alignof(OMPIteratorExpr));
return new (Mem) OMPIteratorExpr(EmptyShell(), NumIterators);
4996}

←

/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/include/llvm/Support/TrailingObjects.h

1//===--- TrailingObjects.h - Variable-length classes ------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This header defines support for implementing classes that have
11/// some trailing object (or arrays of objects) appended to them. The
12/// main purpose is to make it obvious where this idiom is being used,
13/// and to make the usage more idiomatic and more difficult to get
14/// wrong.
15///
16/// The TrailingObject template abstracts away the reinterpret_cast,
17/// pointer arithmetic, and size calculations used for the allocation
18/// and access of appended arrays of objects, and takes care that they
19/// are all allocated at their required alignment. Additionally, it
20/// ensures that the base type is final -- deriving from a class that
21/// expects data appended immediately after it is typically not safe.
22///
23/// Users are expected to derive from this template, and provide
24/// numTrailingObjects implementations for each trailing type except
25/// the last, e.g. like this sample:
26///
27/// \code
28/// class VarLengthObj : private TrailingObjects<VarLengthObj, int, double> {
29///   friend TrailingObjects;
30///
31///   unsigned NumInts, NumDoubles;
32///   size_t numTrailingObjects(OverloadToken<int>) const { return NumInts; }
33///  };
34/// \endcode
35///
36/// You can access the appended arrays via 'getTrailingObjects', and
37/// determine the size needed for allocation via
38/// 'additionalSizeToAlloc' and 'totalSizeToAlloc'.
39///
40/// All the methods implemented by this class are are intended for use
41/// by the implementation of the class, not as part of its interface
42/// (thus, private inheritance is suggested).
43///
44//===----------------------------------------------------------------------===//
45 
46#ifndef LLVM_SUPPORT_TRAILINGOBJECTS_H
47#define LLVM_SUPPORT_TRAILINGOBJECTS_H
48 
49#include "llvm/Support/AlignOf.h"
50#include "llvm/Support/Alignment.h"
51#include "llvm/Support/Compiler.h"
52#include "llvm/Support/MathExtras.h"
53#include "llvm/Support/type_traits.h"
54#include <new>
55#include <type_traits>
56 
57namespace llvm {
58 
59namespace trailing_objects_internal {
60/// Helper template to calculate the max alignment requirement for a set of
61/// objects.
62template <typename First, typename... Rest> class AlignmentCalcHelper {
63private:
64  enum {
65    FirstAlignment = alignof(First),
66    RestAlignment = AlignmentCalcHelper<Rest...>::Alignment,
67  };
68 
69public:
70  enum {
71    Alignment = FirstAlignment > RestAlignment ? FirstAlignment : RestAlignment
72  };
73};
74 
75template <typename First> class AlignmentCalcHelper<First> {
76public:
77  enum { Alignment = alignof(First) };
78};
79 
80/// The base class for TrailingObjects* classes.
81class TrailingObjectsBase {
82protected:
83  /// OverloadToken's purpose is to allow specifying function overloads
84  /// for different types, without actually taking the types as
85  /// parameters. (Necessary because member function templates cannot
86  /// be specialized, so overloads must be used instead of
87  /// specialization.)
88  template <typename T> struct OverloadToken {};
89};
90 
91// Just a little helper for transforming a type pack into the same
92// number of a different type. e.g.:
93//   ExtractSecondType<Foo..., int>::type
94template <typename Ty1, typename Ty2> struct ExtractSecondType {
95  typedef Ty2 type;
96};
97 
98// TrailingObjectsImpl is somewhat complicated, because it is a
99// recursively inheriting template, in order to handle the template
100// varargs. Each level of inheritance picks off a single trailing type
101// then recurses on the rest. The "Align", "BaseTy", and
102// "TopTrailingObj" arguments are passed through unchanged through the
103// recursion. "PrevTy" is, at each level, the type handled by the
104// level right above it.
105 
106template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
107          typename... MoreTys>
108class TrailingObjectsImpl {
109  // The main template definition is never used -- the two
110  // specializations cover all possibilities.
111};
112 
113template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
114          typename NextTy, typename... MoreTys>
115class TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy, NextTy,
116                          MoreTys...>
117    : public TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy,
118                                 MoreTys...> {
119 
120  typedef TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy, MoreTys...>
121      ParentType;
122 
123  struct RequiresRealignment {
124    static const bool value = alignof(PrevTy) < alignof(NextTy);
125  };
126 
127  static constexpr bool requiresRealignment() {
128    return RequiresRealignment::value;
129  }
130 
131protected:
132  // Ensure the inherited getTrailingObjectsImpl is not hidden.
133  using ParentType::getTrailingObjectsImpl;
134 
135  // These two functions are helper functions for
136  // TrailingObjects::getTrailingObjects. They recurse to the left --
137  // the result for each type in the list of trailing types depends on
138  // the result of calling the function on the type to the
139  // left. However, the function for the type to the left is
140  // implemented by a *subclass* of this class, so we invoke it via
141  // the TopTrailingObj, which is, via the
142  // curiously-recurring-template-pattern, the most-derived type in
143  // this recursion, and thus, contains all the overloads.
144  static const NextTy *
145  getTrailingObjectsImpl(const BaseTy *Obj,
146                         TrailingObjectsBase::OverloadToken<NextTy>) {
147    auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
148                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
149                TopTrailingObj::callNumTrailingObjects(
150                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
151 
152    if (requiresRealignment())
153      return reinterpret_cast<const NextTy *>(
154          alignAddr(Ptr, Align::Of<NextTy>()));
155    else
156      return reinterpret_cast<const NextTy *>(Ptr);
157  }
158 
159  static NextTy *
160  getTrailingObjectsImpl(BaseTy *Obj,
161                         TrailingObjectsBase::OverloadToken<NextTy>) {
162    auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
8
←
'Ptr' initialized here→
163                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
7
←
Passing value via 1st parameter 'Obj'→
164                TopTrailingObj::callNumTrailingObjects(
165                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
166 
167    if (requiresRealignment())
9
←
Taking false branch→
168      return reinterpret_cast<NextTy *>(alignAddr(Ptr, Align::Of<NextTy>()));
169    else
170      return reinterpret_cast<NextTy *>(Ptr);
10
←
Returning pointer (loaded from 'Ptr')→
171  }
172 
173  // Helper function for TrailingObjects::additionalSizeToAlloc: this
174  // function recurses to superclasses, each of which requires one
175  // fewer size_t argument, and adds its own size.
176  static constexpr size_t additionalSizeToAllocImpl(
177      size_t SizeSoFar, size_t Count1,
178      typename ExtractSecondType<MoreTys, size_t>::type... MoreCounts) {
179    return ParentType::additionalSizeToAllocImpl(
180        (requiresRealignment() ? llvm::alignTo<alignof(NextTy)>(SizeSoFar)
181                               : SizeSoFar) +
182            sizeof(NextTy) * Count1,
183        MoreCounts...);
184  }
185};
186 
187// The base case of the TrailingObjectsImpl inheritance recursion,
188// when there's no more trailing types.
189template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy>
190class alignas(Align) TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy>
191    : public TrailingObjectsBase {
192protected:
193  // This is a dummy method, only here so the "using" doesn't fail --
194  // it will never be called, because this function recurses backwards
195  // up the inheritance chain to subclasses.
196  static void getTrailingObjectsImpl();
197 
198  static constexpr size_t additionalSizeToAllocImpl(size_t SizeSoFar) {
199    return SizeSoFar;
200  }
201 
202  template <bool CheckAlignment> static void verifyTrailingObjectsAlignment() {}
203};
204 
205} // end namespace trailing_objects_internal
206 
207// Finally, the main type defined in this file, the one intended for users...
208 
209/// See the file comment for details on the usage of the
210/// TrailingObjects type.
211template <typename BaseTy, typename... TrailingTys>
212class TrailingObjects : private trailing_objects_internal::TrailingObjectsImpl<
213                            trailing_objects_internal::AlignmentCalcHelper<
214                                TrailingTys...>::Alignment,
215                            BaseTy, TrailingObjects<BaseTy, TrailingTys...>,
216                            BaseTy, TrailingTys...> {
217 
218  template <int A, typename B, typename T, typename P, typename... M>
219  friend class trailing_objects_internal::TrailingObjectsImpl;
220 
221  template <typename... Tys> class Foo {};
222 
223  typedef trailing_objects_internal::TrailingObjectsImpl<
224      trailing_objects_internal::AlignmentCalcHelper<TrailingTys...>::Alignment,
225      BaseTy, TrailingObjects<BaseTy, TrailingTys...>, BaseTy, TrailingTys...>
226      ParentType;
227  using TrailingObjectsBase = trailing_objects_internal::TrailingObjectsBase;
228 
229  using ParentType::getTrailingObjectsImpl;
230 
231  // This function contains only a static_assert BaseTy is final. The
232  // static_assert must be in a function, and not at class-level
233  // because BaseTy isn't complete at class instantiation time, but
234  // will be by the time this function is instantiated.
235  static void verifyTrailingObjectsAssertions() {
236    static_assert(std::is_final<BaseTy>(), "BaseTy must be final.");
237  }
238 
239  // These two methods are the base of the recursion for this method.
240  static const BaseTy *
241  getTrailingObjectsImpl(const BaseTy *Obj,
242                         TrailingObjectsBase::OverloadToken<BaseTy>) {
243    return Obj;
244  }
245 
246  static BaseTy *
247  getTrailingObjectsImpl(BaseTy *Obj,
248                         TrailingObjectsBase::OverloadToken<BaseTy>) {
249    return Obj;
250  }
251 
252  // callNumTrailingObjects simply calls numTrailingObjects on the
253  // provided Obj -- except when the type being queried is BaseTy
254  // itself. There is always only one of the base object, so that case
255  // is handled here. (An additional benefit of indirecting through
256  // this function is that consumers only say "friend
257  // TrailingObjects", and thus, only this class itself can call the
258  // numTrailingObjects function.)
259  static size_t
260  callNumTrailingObjects(const BaseTy *Obj,
261                         TrailingObjectsBase::OverloadToken<BaseTy>) {
262    return 1;
263  }
264 
265  template <typename T>
266  static size_t callNumTrailingObjects(const BaseTy *Obj,
267                                       TrailingObjectsBase::OverloadToken<T>) {
268    return Obj->numTrailingObjects(TrailingObjectsBase::OverloadToken<T>());
269  }
270 
271public:
272  // Make this (privately inherited) member public.
273#ifndef _MSC_VER
274  using ParentType::OverloadToken;
275#else
276  // An MSVC bug prevents the above from working, (last tested at CL version
277  // 19.28). "Class5" in TrailingObjectsTest.cpp tests the problematic case.
278  template <typename T>
279  using OverloadToken = typename ParentType::template OverloadToken<T>;
280#endif
281 
282  /// Returns a pointer to the trailing object array of the given type
283  /// (which must be one of those specified in the class template). The
284  /// array may have zero or more elements in it.
285  template <typename T> const T *getTrailingObjects() const {
286    verifyTrailingObjectsAssertions();
287    // Forwards to an impl function with overloads, since member
288    // function templates can't be specialized.
289    return this->getTrailingObjectsImpl(
290        static_cast<const BaseTy *>(this),
291        TrailingObjectsBase::OverloadToken<T>());
292  }
293 
294  /// Returns a pointer to the trailing object array of the given type
295  /// (which must be one of those specified in the class template). The
296  /// array may have zero or more elements in it.
297  template <typename T> T *getTrailingObjects() {
298    verifyTrailingObjectsAssertions();
299    // Forwards to an impl function with overloads, since member
300    // function templates can't be specialized.
301    return this->getTrailingObjectsImpl(
6
←
Calling 'TrailingObjectsImpl::getTrailingObjectsImpl'→
11
←
Returning from 'TrailingObjectsImpl::getTrailingObjectsImpl'→
12
←
Returning pointer→
302        static_cast<BaseTy *>(this), TrailingObjectsBase::OverloadToken<T>());
5
←
Passing value via 1st parameter 'Obj'→
303  }
304 
305  /// Returns the size of the trailing data, if an object were
306  /// allocated with the given counts (The counts are in the same order
307  /// as the template arguments). This does not include the size of the
308  /// base object.  The template arguments must be the same as those
309  /// used in the class; they are supplied here redundantly only so
310  /// that it's clear what the counts are counting in callers.
311  template <typename... Tys>
312  static constexpr std::enable_if_t<
313      std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
314  additionalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
315                        TrailingTys, size_t>::type... Counts) {
316    return ParentType::additionalSizeToAllocImpl(0, Counts...);
317  }
318 
319  /// Returns the total size of an object if it were allocated with the
320  /// given trailing object counts. This is the same as
321  /// additionalSizeToAlloc, except it *does* include the size of the base
322  /// object.
323  template <typename... Tys>
324  static constexpr std::enable_if_t<
325      std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
326  totalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
327                   TrailingTys, size_t>::type... Counts) {
328    return sizeof(BaseTy) + ParentType::additionalSizeToAllocImpl(0, Counts...);
329  }
330 
331  TrailingObjects() = default;
332  TrailingObjects(const TrailingObjects &) = delete;
333  TrailingObjects(TrailingObjects &&) = delete;
334  TrailingObjects &operator=(const TrailingObjects &) = delete;
335  TrailingObjects &operator=(TrailingObjects &&) = delete;
336 
337  /// A type where its ::with_counts template member has a ::type member
338  /// suitable for use as uninitialized storage for an object with the given
339  /// trailing object counts. The template arguments are similar to those
340  /// of additionalSizeToAlloc.
341  ///
342  /// Use with FixedSizeStorageOwner, e.g.:
343  ///
344  /// \code{.cpp}
345  ///
346  /// MyObj::FixedSizeStorage<void *>::with_counts<1u>::type myStackObjStorage;
347  /// MyObj::FixedSizeStorageOwner
348  ///     myStackObjOwner(new ((void *)&myStackObjStorage) MyObj);
349  /// MyObj *const myStackObjPtr = myStackObjOwner.get();
350  ///
351  /// \endcode
352  template <typename... Tys> struct FixedSizeStorage {
353    template <size_t... Counts> struct with_counts {
354      enum { Size = totalSizeToAlloc<Tys...>(Counts...) };
355      struct type {
356        alignas(BaseTy) char buffer[Size];
357      };
358    };
359  };
360 
361  /// A type that acts as the owner for an object placed into fixed storage.
362  class FixedSizeStorageOwner {
363  public:
364    FixedSizeStorageOwner(BaseTy *p) : p(p) {}
365    ~FixedSizeStorageOwner() {
366      assert(p && "FixedSizeStorageOwner owns null?")(static_cast<void> (0));
367      p->~BaseTy();
368    }
369 
370    BaseTy *get() { return p; }
371    const BaseTy *get() const { return p; }
372 
373  private:
374    FixedSizeStorageOwner(const FixedSizeStorageOwner &) = delete;
375    FixedSizeStorageOwner(FixedSizeStorageOwner &&) = delete;
376    FixedSizeStorageOwner &operator=(const FixedSizeStorageOwner &) = delete;
377    FixedSizeStorageOwner &operator=(FixedSizeStorageOwner &&) = delete;
378 
379    BaseTy *const p;
380  };
381};
382 
383} // end namespace llvm
384 
385#endif