/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/clang/lib/Sema/SemaType.cpp

Bug Summary

File:	build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/clang/lib/Sema/SemaType.cpp
Warning:	line 952, column 13 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name SemaType.cpp -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 -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/build-llvm -resource-dir /usr/lib/llvm-16/lib/clang/16.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/clang/lib/Sema -I /build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U 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-16/lib/clang/16.0.0/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 -fmacro-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/= -O3 -Wno-unused-command-line-argument -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 -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -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-2022-10-03-140002-15933-1 -x c++ /build/llvm-toolchain-snapshot-16~++20221003111214+1fa2019828ca/clang/lib/Sema/SemaType.cpp
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
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 type-related semantic analysis.
10//
11//===----------------------------------------------------------------------===//

13#include "TypeLocBuilder.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/ASTStructuralEquivalence.h"
18#include "clang/AST/CXXInheritance.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/Expr.h"
22#include "clang/AST/Type.h"
23#include "clang/AST/TypeLoc.h"
24#include "clang/AST/TypeLocVisitor.h"
25#include "clang/Basic/PartialDiagnostic.h"
26#include "clang/Basic/SourceLocation.h"
27#include "clang/Basic/Specifiers.h"
28#include "clang/Basic/TargetInfo.h"
29#include "clang/Lex/Preprocessor.h"
30#include "clang/Sema/DeclSpec.h"
31#include "clang/Sema/DelayedDiagnostic.h"
32#include "clang/Sema/Lookup.h"
33#include "clang/Sema/ParsedTemplate.h"
34#include "clang/Sema/ScopeInfo.h"
35#include "clang/Sema/SemaInternal.h"
36#include "clang/Sema/Template.h"
37#include "clang/Sema/TemplateInstCallback.h"
38#include "llvm/ADT/ArrayRef.h"
39#include "llvm/ADT/SmallPtrSet.h"
40#include "llvm/ADT/SmallString.h"
41#include "llvm/IR/DerivedTypes.h"
42#include "llvm/Support/ErrorHandling.h"
43#include <bitset>

45using namespace clang;

47enum TypeDiagSelector {
TDS_Function,
TDS_Pointer,
TDS_ObjCObjOrBlock
51};

53/// isOmittedBlockReturnType - Return true if this declarator is missing a
54/// return type because this is a omitted return type on a block literal.
55static bool isOmittedBlockReturnType(const Declarator &D) {
if (D.getContext() != DeclaratorContext::BlockLiteral ||
    D.getDeclSpec().hasTypeSpecifier())
  return false;

if (D.getNumTypeObjects() == 0)
  return true;   // ^{ ... }

if (D.getNumTypeObjects() == 1 &&
    D.getTypeObject(0).Kind == DeclaratorChunk::Function)
  return true;   // ^(int X, float Y) { ... }

return false;
68}

70/// diagnoseBadTypeAttribute - Diagnoses a type attribute which
71/// doesn't apply to the given type.
72static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
                                   QualType type) {
TypeDiagSelector WhichType;
bool useExpansionLoc = true;
switch (attr.getKind()) {
case ParsedAttr::AT_ObjCGC:
  WhichType = TDS_Pointer;
  break;
case ParsedAttr::AT_ObjCOwnership:
  WhichType = TDS_ObjCObjOrBlock;
  break;
default:
  // Assume everything else was a function attribute.
  WhichType = TDS_Function;
  useExpansionLoc = false;
  break;
}

SourceLocation loc = attr.getLoc();
StringRef name = attr.getAttrName()->getName();

// The GC attributes are usually written with macros;  special-case them.
IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
                                        : nullptr;
if (useExpansionLoc && loc.isMacroID() && II) {
  if (II->isStr("strong")) {
    if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
  } else if (II->isStr("weak")) {
    if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
  }
}

S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
  << type;
106}

108// objc_gc applies to Objective-C pointers or, otherwise, to the
109// smallest available pointer type (i.e. 'void*' in 'void**').
110#define OBJC_POINTER_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_ObjCGC: case ParsedAttr::AT_ObjCOwnership                                       \
case ParsedAttr::AT_ObjCGC:                                                  \
case ParsedAttr::AT_ObjCOwnership

114// Calling convention attributes.
115#define CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
 ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_SwiftAsyncCall: case ParsedAttr::AT_VectorCall
: case ParsedAttr::AT_AArch64VectorPcs: case ParsedAttr::AT_AArch64SVEPcs
: case ParsedAttr::AT_AMDGPUKernelCall: case ParsedAttr::AT_MSABI
: case ParsedAttr::AT_SysVABI: case ParsedAttr::AT_Pcs: case ParsedAttr
::AT_IntelOclBicc: case ParsedAttr::AT_PreserveMost: case ParsedAttr
::AT_PreserveAll                                            \
case ParsedAttr::AT_CDecl:                                                   \
case ParsedAttr::AT_FastCall:                                                \
case ParsedAttr::AT_StdCall:                                                 \
case ParsedAttr::AT_ThisCall:                                                \
case ParsedAttr::AT_RegCall:                                                 \
case ParsedAttr::AT_Pascal:                                                  \
case ParsedAttr::AT_SwiftCall:                                               \
case ParsedAttr::AT_SwiftAsyncCall:                                          \
case ParsedAttr::AT_VectorCall:                                              \
case ParsedAttr::AT_AArch64VectorPcs:                                        \
case ParsedAttr::AT_AArch64SVEPcs:                                           \
case ParsedAttr::AT_AMDGPUKernelCall:                                        \
case ParsedAttr::AT_MSABI:                                                   \
case ParsedAttr::AT_SysVABI:                                                 \
case ParsedAttr::AT_Pcs:                                                     \
case ParsedAttr::AT_IntelOclBicc:                                            \
case ParsedAttr::AT_PreserveMost:                                            \
case ParsedAttr::AT_PreserveAll

135// Function type attributes.
136#define FUNCTION_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_NSReturnsRetained: case ParsedAttr::AT_NoReturn
: case ParsedAttr::AT_Regparm: case ParsedAttr::AT_CmseNSCall
: case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: case ParsedAttr
::AT_AnyX86NoCfCheck: case ParsedAttr::AT_CDecl: case ParsedAttr
::AT_FastCall: case ParsedAttr::AT_StdCall: case ParsedAttr::
AT_ThisCall: case ParsedAttr::AT_RegCall: case ParsedAttr::AT_Pascal
: case ParsedAttr::AT_SwiftCall: case ParsedAttr::AT_SwiftAsyncCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_AArch64SVEPcs: case ParsedAttr::AT_AMDGPUKernelCall
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
 ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll                                           \
case ParsedAttr::AT_NSReturnsRetained:                                       \
case ParsedAttr::AT_NoReturn:                                                \
case ParsedAttr::AT_Regparm:                                                 \
case ParsedAttr::AT_CmseNSCall:                                              \
case ParsedAttr::AT_AnyX86NoCallerSavedRegisters:                            \
case ParsedAttr::AT_AnyX86NoCfCheck:                                         \
  CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
 ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_SwiftAsyncCall: case ParsedAttr::AT_VectorCall
: case ParsedAttr::AT_AArch64VectorPcs: case ParsedAttr::AT_AArch64SVEPcs
: case ParsedAttr::AT_AMDGPUKernelCall: case ParsedAttr::AT_MSABI
: case ParsedAttr::AT_SysVABI: case ParsedAttr::AT_Pcs: case ParsedAttr
::AT_IntelOclBicc: case ParsedAttr::AT_PreserveMost: case ParsedAttr
::AT_PreserveAll

145// Microsoft-specific type qualifiers.
146#define MS_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_Ptr32: case ParsedAttr::AT_Ptr64: case ParsedAttr
::AT_SPtr: case ParsedAttr::AT_UPtr                                                 \
case ParsedAttr::AT_Ptr32:                                                   \
case ParsedAttr::AT_Ptr64:                                                   \
case ParsedAttr::AT_SPtr:                                                    \
case ParsedAttr::AT_UPtr

152// Nullability qualifiers.
153#define NULLABILITY_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_TypeNonNull: case ParsedAttr::AT_TypeNullable
: case ParsedAttr::AT_TypeNullableResult: case ParsedAttr::AT_TypeNullUnspecified                                        \
case ParsedAttr::AT_TypeNonNull:                                             \
case ParsedAttr::AT_TypeNullable:                                            \
case ParsedAttr::AT_TypeNullableResult:                                      \
case ParsedAttr::AT_TypeNullUnspecified

159namespace {
/// An object which stores processing state for the entire
/// GetTypeForDeclarator process.
class TypeProcessingState {
  Sema &sema;

  /// The declarator being processed.
  Declarator &declarator;

  /// The index of the declarator chunk we're currently processing.
  /// May be the total number of valid chunks, indicating the
  /// DeclSpec.
  unsigned chunkIndex;

  /// The original set of attributes on the DeclSpec.
  SmallVector<ParsedAttr *, 2> savedAttrs;

  /// A list of attributes to diagnose the uselessness of when the
  /// processing is complete.
  SmallVector<ParsedAttr *, 2> ignoredTypeAttrs;

  /// Attributes corresponding to AttributedTypeLocs that we have not yet
  /// populated.
  // FIXME: The two-phase mechanism by which we construct Types and fill
  // their TypeLocs makes it hard to correctly assign these. We keep the
  // attributes in creation order as an attempt to make them line up
  // properly.
  using TypeAttrPair = std::pair<const AttributedType*, const Attr*>;
  SmallVector<TypeAttrPair, 8> AttrsForTypes;
  bool AttrsForTypesSorted = true;

  /// MacroQualifiedTypes mapping to macro expansion locations that will be
  /// stored in a MacroQualifiedTypeLoc.
  llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros;

  /// Flag to indicate we parsed a noderef attribute. This is used for
  /// validating that noderef was used on a pointer or array.
  bool parsedNoDeref;

public:
  TypeProcessingState(Sema &sema, Declarator &declarator)
      : sema(sema), declarator(declarator),
        chunkIndex(declarator.getNumTypeObjects()), parsedNoDeref(false) {}

  Sema &getSema() const {
    return sema;
  }

  Declarator &getDeclarator() const {
    return declarator;
  }

  bool isProcessingDeclSpec() const {
    return chunkIndex == declarator.getNumTypeObjects();
  }

  unsigned getCurrentChunkIndex() const {
    return chunkIndex;
  }

  void setCurrentChunkIndex(unsigned idx) {
    assert(idx <= declarator.getNumTypeObjects())(static_cast <bool> (idx <= declarator.getNumTypeObjects
()) ? void (0) : __assert_fail ("idx <= declarator.getNumTypeObjects()"
, "clang/lib/Sema/SemaType.cpp", 220, __extension__ __PRETTY_FUNCTION__
));
    chunkIndex = idx;
  }

  ParsedAttributesView &getCurrentAttributes() const {
    if (isProcessingDeclSpec())
      return getMutableDeclSpec().getAttributes();
    return declarator.getTypeObject(chunkIndex).getAttrs();
  }

  /// Save the current set of attributes on the DeclSpec.
  void saveDeclSpecAttrs() {
    // Don't try to save them multiple times.
    if (!savedAttrs.empty())
      return;

    DeclSpec &spec = getMutableDeclSpec();
    llvm::append_range(savedAttrs,
                       llvm::make_pointer_range(spec.getAttributes()));
  }

  /// Record that we had nowhere to put the given type attribute.
  /// We will diagnose such attributes later.
  void addIgnoredTypeAttr(ParsedAttr &attr) {
    ignoredTypeAttrs.push_back(&attr);
  }

  /// Diagnose all the ignored type attributes, given that the
  /// declarator worked out to the given type.
  void diagnoseIgnoredTypeAttrs(QualType type) const {
    for (auto *Attr : ignoredTypeAttrs)
      diagnoseBadTypeAttribute(getSema(), *Attr, type);
  }

  /// Get an attributed type for the given attribute, and remember the Attr
  /// object so that we can attach it to the AttributedTypeLoc.
  QualType getAttributedType(Attr *A, QualType ModifiedType,
                             QualType EquivType) {
    QualType T =
        sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType);
    AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A});
    AttrsForTypesSorted = false;
    return T;
  }

  /// Get a BTFTagAttributed type for the btf_type_tag attribute.
  QualType getBTFTagAttributedType(const BTFTypeTagAttr *BTFAttr,
                                   QualType WrappedType) {
    return sema.Context.getBTFTagAttributedType(BTFAttr, WrappedType);
  }

  /// Completely replace the \c auto in \p TypeWithAuto by
  /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if
  /// necessary.
  QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) {
    QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement);
    if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) {
      // Attributed type still should be an attributed type after replacement.
      auto *NewAttrTy = cast<AttributedType>(T.getTypePtr());
      for (TypeAttrPair &A : AttrsForTypes) {
        if (A.first == AttrTy)
          A.first = NewAttrTy;
      }
      AttrsForTypesSorted = false;
    }
    return T;
  }

  /// Extract and remove the Attr* for a given attributed type.
  const Attr *takeAttrForAttributedType(const AttributedType *AT) {
    if (!AttrsForTypesSorted) {
      llvm::stable_sort(AttrsForTypes, llvm::less_first());
      AttrsForTypesSorted = true;
    }

    // FIXME: This is quadratic if we have lots of reuses of the same
    // attributed type.
    for (auto It = std::partition_point(
             AttrsForTypes.begin(), AttrsForTypes.end(),
             [=](const TypeAttrPair &A) { return A.first < AT; });
         It != AttrsForTypes.end() && It->first == AT; ++It) {
      if (It->second) {
        const Attr *Result = It->second;
        It->second = nullptr;
        return Result;
      }
    }

    llvm_unreachable("no Attr* for AttributedType*")::llvm::llvm_unreachable_internal("no Attr* for AttributedType*"
, "clang/lib/Sema/SemaType.cpp", 308);
  }

  SourceLocation
  getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const {
    auto FoundLoc = LocsForMacros.find(MQT);
    assert(FoundLoc != LocsForMacros.end() &&(static_cast <bool> (FoundLoc != LocsForMacros.end() &&
 "Unable to find macro expansion location for MacroQualifedType"
) ? void (0) : __assert_fail ("FoundLoc != LocsForMacros.end() && \"Unable to find macro expansion location for MacroQualifedType\""
, "clang/lib/Sema/SemaType.cpp", 315, __extension__ __PRETTY_FUNCTION__
))
           "Unable to find macro expansion location for MacroQualifedType")(static_cast <bool> (FoundLoc != LocsForMacros.end() &&
 "Unable to find macro expansion location for MacroQualifedType"
) ? void (0) : __assert_fail ("FoundLoc != LocsForMacros.end() && \"Unable to find macro expansion location for MacroQualifedType\""
, "clang/lib/Sema/SemaType.cpp", 315, __extension__ __PRETTY_FUNCTION__
));
    return FoundLoc->second;
  }

  void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT,
                                            SourceLocation Loc) {
    LocsForMacros[MQT] = Loc;
  }

  void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; }

  bool didParseNoDeref() const { return parsedNoDeref; }

  ~TypeProcessingState() {
    if (savedAttrs.empty())
      return;

    getMutableDeclSpec().getAttributes().clearListOnly();
    for (ParsedAttr *AL : savedAttrs)
      getMutableDeclSpec().getAttributes().addAtEnd(AL);
  }

private:
  DeclSpec &getMutableDeclSpec() const {
    return const_cast<DeclSpec&>(declarator.getDeclSpec());
  }
};
342} // end anonymous namespace

344static void moveAttrFromListToList(ParsedAttr &attr,
                                 ParsedAttributesView &fromList,
                                 ParsedAttributesView &toList) {
fromList.remove(&attr);
toList.addAtEnd(&attr);
349}

351/// The location of a type attribute.
352enum TypeAttrLocation {
/// The attribute is in the decl-specifier-seq.
TAL_DeclSpec,
/// The attribute is part of a DeclaratorChunk.
TAL_DeclChunk,
/// The attribute is immediately after the declaration's name.
TAL_DeclName
359};

361static void processTypeAttrs(TypeProcessingState &state, QualType &type,
                           TypeAttrLocation TAL,
                           const ParsedAttributesView &attrs);

365static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                                 QualType &type);

368static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
                                           ParsedAttr &attr, QualType &type);

371static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                               QualType &type);

374static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
                                      ParsedAttr &attr, QualType &type);

377static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
                                    ParsedAttr &attr, QualType &type) {
if (attr.getKind() == ParsedAttr::AT_ObjCGC)
  return handleObjCGCTypeAttr(state, attr, type);
assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership)(static_cast <bool> (attr.getKind() == ParsedAttr::AT_ObjCOwnership
) ? void (0) : __assert_fail ("attr.getKind() == ParsedAttr::AT_ObjCOwnership"
, "clang/lib/Sema/SemaType.cpp", 381, __extension__ __PRETTY_FUNCTION__
));
return handleObjCOwnershipTypeAttr(state, attr, type);
383}

385/// Given the index of a declarator chunk, check whether that chunk
386/// directly specifies the return type of a function and, if so, find
387/// an appropriate place for it.
388///
389/// \param i - a notional index which the search will start
390///   immediately inside
391///
392/// \param onlyBlockPointers Whether we should only look into block
393/// pointer types (vs. all pointer types).
394static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
                                              unsigned i,
                                              bool onlyBlockPointers) {
assert(i <= declarator.getNumTypeObjects())(static_cast <bool> (i <= declarator.getNumTypeObjects
()) ? void (0) : __assert_fail ("i <= declarator.getNumTypeObjects()"
, "clang/lib/Sema/SemaType.cpp", 397, __extension__ __PRETTY_FUNCTION__
));

DeclaratorChunk *result = nullptr;

// First, look inwards past parens for a function declarator.
for (; i != 0; --i) {
  DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
  switch (fnChunk.Kind) {
  case DeclaratorChunk::Paren:
    continue;

  // If we find anything except a function, bail out.
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::Array:
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    return result;

  // If we do find a function declarator, scan inwards from that,
  // looking for a (block-)pointer declarator.
  case DeclaratorChunk::Function:
    for (--i; i != 0; --i) {
      DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
      switch (ptrChunk.Kind) {
      case DeclaratorChunk::Paren:
      case DeclaratorChunk::Array:
      case DeclaratorChunk::Function:
      case DeclaratorChunk::Reference:
      case DeclaratorChunk::Pipe:
        continue;

      case DeclaratorChunk::MemberPointer:
      case DeclaratorChunk::Pointer:
        if (onlyBlockPointers)
          continue;

        [[fallthrough]];

      case DeclaratorChunk::BlockPointer:
        result = &ptrChunk;
        goto continue_outer;
      }
      llvm_unreachable("bad declarator chunk kind")::llvm::llvm_unreachable_internal("bad declarator chunk kind"
, "clang/lib/Sema/SemaType.cpp", 441);
    }

    // If we run out of declarators doing that, we're done.
    return result;
  }
  llvm_unreachable("bad declarator chunk kind")::llvm::llvm_unreachable_internal("bad declarator chunk kind"
, "clang/lib/Sema/SemaType.cpp", 447);

  // Okay, reconsider from our new point.
continue_outer: ;
}

// Ran out of chunks, bail out.
return result;
455}

457/// Given that an objc_gc attribute was written somewhere on a
458/// declaration *other* than on the declarator itself (for which, use
459/// distributeObjCPointerTypeAttrFromDeclarator), and given that it
460/// didn't apply in whatever position it was written in, try to move
461/// it to a more appropriate position.
462static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
                                        ParsedAttr &attr, QualType type) {
Declarator &declarator = state.getDeclarator();

// Move it to the outermost normal or block pointer declarator.
for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
  switch (chunk.Kind) {
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::BlockPointer: {
    // But don't move an ARC ownership attribute to the return type
    // of a block.
    DeclaratorChunk *destChunk = nullptr;
    if (state.isProcessingDeclSpec() &&
        attr.getKind() == ParsedAttr::AT_ObjCOwnership)
      destChunk = maybeMovePastReturnType(declarator, i - 1,
                                          /*onlyBlockPointers=*/true);
    if (!destChunk) destChunk = &chunk;

    moveAttrFromListToList(attr, state.getCurrentAttributes(),
                           destChunk->getAttrs());
    return;
  }

  case DeclaratorChunk::Paren:
  case DeclaratorChunk::Array:
    continue;

  // We may be starting at the return type of a block.
  case DeclaratorChunk::Function:
    if (state.isProcessingDeclSpec() &&
        attr.getKind() == ParsedAttr::AT_ObjCOwnership) {
      if (DeclaratorChunk *dest = maybeMovePastReturnType(
                                    declarator, i,
                                    /*onlyBlockPointers=*/true)) {
        moveAttrFromListToList(attr, state.getCurrentAttributes(),
                               dest->getAttrs());
        return;
      }
    }
    goto error;

  // Don't walk through these.
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    goto error;
  }
}
error:

diagnoseBadTypeAttribute(state.getSema(), attr, type);
514}

516/// Distribute an objc_gc type attribute that was written on the
517/// declarator.
518static void distributeObjCPointerTypeAttrFromDeclarator(
  TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();

// objc_gc goes on the innermost pointer to something that's not a
// pointer.
unsigned innermost = -1U;
bool considerDeclSpec = true;
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i);
  switch (chunk.Kind) {
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::BlockPointer:
    innermost = i;
    continue;

  case DeclaratorChunk::Reference:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Paren:
  case DeclaratorChunk::Array:
  case DeclaratorChunk::Pipe:
    continue;

  case DeclaratorChunk::Function:
    considerDeclSpec = false;
    goto done;
  }
}
done:

// That might actually be the decl spec if we weren't blocked by
// anything in the declarator.
if (considerDeclSpec) {
  if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
    // Splice the attribute into the decl spec.  Prevents the
    // attribute from being applied multiple times and gives
    // the source-location-filler something to work with.
    state.saveDeclSpecAttrs();
    declarator.getMutableDeclSpec().getAttributes().takeOneFrom(
        declarator.getAttributes(), &attr);
    return;
  }
}

// Otherwise, if we found an appropriate chunk, splice the attribute
// into it.
if (innermost != -1U) {
  moveAttrFromListToList(attr, declarator.getAttributes(),
                         declarator.getTypeObject(innermost).getAttrs());
  return;
}

// Otherwise, diagnose when we're done building the type.
declarator.getAttributes().remove(&attr);
state.addIgnoredTypeAttr(attr);
573}

575/// A function type attribute was written somewhere in a declaration
576/// *other* than on the declarator itself or in the decl spec.  Given
577/// that it didn't apply in whatever position it was written in, try
578/// to move it to a more appropriate position.
579static void distributeFunctionTypeAttr(TypeProcessingState &state,
                                     ParsedAttr &attr, QualType type) {
Declarator &declarator = state.getDeclarator();

// Try to push the attribute from the return type of a function to
// the function itself.
for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
  switch (chunk.Kind) {
  case DeclaratorChunk::Function:
    moveAttrFromListToList(attr, state.getCurrentAttributes(),
                           chunk.getAttrs());
    return;

  case DeclaratorChunk::Paren:
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::Array:
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    continue;
  }
}

diagnoseBadTypeAttribute(state.getSema(), attr, type);
605}

607/// Try to distribute a function type attribute to the innermost
608/// function chunk or type.  Returns true if the attribute was
609/// distributed, false if no location was found.
610static bool distributeFunctionTypeAttrToInnermost(
  TypeProcessingState &state, ParsedAttr &attr,
  ParsedAttributesView &attrList, QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();

// Put it on the innermost function chunk, if there is one.
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i);
  if (chunk.Kind != DeclaratorChunk::Function) continue;

  moveAttrFromListToList(attr, attrList, chunk.getAttrs());
  return true;
}

return handleFunctionTypeAttr(state, attr, declSpecType);
625}

627/// A function type attribute was written in the decl spec.  Try to
628/// apply it somewhere.
629static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
                                                 ParsedAttr &attr,
                                                 QualType &declSpecType) {
state.saveDeclSpecAttrs();

// Try to distribute to the innermost.
if (distributeFunctionTypeAttrToInnermost(
        state, attr, state.getCurrentAttributes(), declSpecType))
  return;

// If that failed, diagnose the bad attribute when the declarator is
// fully built.
state.addIgnoredTypeAttr(attr);
642}

644/// A function type attribute was written on the declarator or declaration.
645/// Try to apply it somewhere.
646/// `Attrs` is the attribute list containing the declaration (either of the
647/// declarator or the declaration).
648static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
                                                   ParsedAttr &attr,
                                                   QualType &declSpecType) {
Declarator &declarator = state.getDeclarator();

// Try to distribute to the innermost.
if (distributeFunctionTypeAttrToInnermost(
        state, attr, declarator.getAttributes(), declSpecType))
  return;

// If that failed, diagnose the bad attribute when the declarator is
// fully built.
declarator.getAttributes().remove(&attr);
state.addIgnoredTypeAttr(attr);
662}

664/// Given that there are attributes written on the declarator or declaration
665/// itself, try to distribute any type attributes to the appropriate
666/// declarator chunk.
667///
668/// These are attributes like the following:
669///   int f ATTR;
670///   int (f ATTR)();
671/// but not necessarily this:
672///   int f() ATTR;
673///
674/// `Attrs` is the attribute list containing the declaration (either of the
675/// declarator or the declaration).
676static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
                                            QualType &declSpecType) {
// The called functions in this loop actually remove things from the current
// list, so iterating over the existing list isn't possible.  Instead, make a
// non-owning copy and iterate over that.
ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()};
for (ParsedAttr &attr : AttrsCopy) {
  // Do not distribute [[]] attributes. They have strict rules for what
  // they appertain to.
  if (attr.isStandardAttributeSyntax())
    continue;

  switch (attr.getKind()) {
  OBJC_POINTER_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_ObjCGC: case ParsedAttr::AT_ObjCOwnership:
    distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType);
    break;

  FUNCTION_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_NSReturnsRetained: case ParsedAttr::AT_NoReturn
: case ParsedAttr::AT_Regparm: case ParsedAttr::AT_CmseNSCall
: case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: case ParsedAttr
::AT_AnyX86NoCfCheck: case ParsedAttr::AT_CDecl: case ParsedAttr
::AT_FastCall: case ParsedAttr::AT_StdCall: case ParsedAttr::
AT_ThisCall: case ParsedAttr::AT_RegCall: case ParsedAttr::AT_Pascal
: case ParsedAttr::AT_SwiftCall: case ParsedAttr::AT_SwiftAsyncCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_AArch64SVEPcs: case ParsedAttr::AT_AMDGPUKernelCall
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
 ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll:
    distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType);
    break;

  MS_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_Ptr32: case ParsedAttr::AT_Ptr64: case ParsedAttr
::AT_SPtr: case ParsedAttr::AT_UPtr:
    // Microsoft type attributes cannot go after the declarator-id.
    continue;

  NULLABILITY_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_TypeNonNull: case ParsedAttr::AT_TypeNullable
: case ParsedAttr::AT_TypeNullableResult: case ParsedAttr::AT_TypeNullUnspecified:
    // Nullability specifiers cannot go after the declarator-id.

  // Objective-C __kindof does not get distributed.
  case ParsedAttr::AT_ObjCKindOf:
    continue;

  default:
    break;
  }
}
712}

714/// Add a synthetic '()' to a block-literal declarator if it is
715/// required, given the return type.
716static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
                                        QualType declSpecType) {
Declarator &declarator = state.getDeclarator();

// First, check whether the declarator would produce a function,
// i.e. whether the innermost semantic chunk is a function.
if (declarator.isFunctionDeclarator()) {
  // If so, make that declarator a prototyped declarator.
  declarator.getFunctionTypeInfo().hasPrototype = true;
  return;
}

// If there are any type objects, the type as written won't name a
// function, regardless of the decl spec type.  This is because a
// block signature declarator is always an abstract-declarator, and
// abstract-declarators can't just be parentheses chunks.  Therefore
// we need to build a function chunk unless there are no type
// objects and the decl spec type is a function.
if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
  return;

// Note that there *are* cases with invalid declarators where
// declarators consist solely of parentheses.  In general, these
// occur only in failed efforts to make function declarators, so
// faking up the function chunk is still the right thing to do.

// Otherwise, we need to fake up a function declarator.
SourceLocation loc = declarator.getBeginLoc();

// ...and *prepend* it to the declarator.
SourceLocation NoLoc;
declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
    /*HasProto=*/true,
    /*IsAmbiguous=*/false,
    /*LParenLoc=*/NoLoc,
    /*ArgInfo=*/nullptr,
    /*NumParams=*/0,
    /*EllipsisLoc=*/NoLoc,
    /*RParenLoc=*/NoLoc,
    /*RefQualifierIsLvalueRef=*/true,
    /*RefQualifierLoc=*/NoLoc,
    /*MutableLoc=*/NoLoc, EST_None,
    /*ESpecRange=*/SourceRange(),
    /*Exceptions=*/nullptr,
    /*ExceptionRanges=*/nullptr,
    /*NumExceptions=*/0,
    /*NoexceptExpr=*/nullptr,
    /*ExceptionSpecTokens=*/nullptr,
    /*DeclsInPrototype=*/None, loc, loc, declarator));

// For consistency, make sure the state still has us as processing
// the decl spec.
assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1)(static_cast <bool> (state.getCurrentChunkIndex() == declarator
.getNumTypeObjects() - 1) ? void (0) : __assert_fail ("state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1"
, "clang/lib/Sema/SemaType.cpp", 768, __extension__ __PRETTY_FUNCTION__
));
state.setCurrentChunkIndex(declarator.getNumTypeObjects());
770}

772static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
                                          unsigned &TypeQuals,
                                          QualType TypeSoFar,
                                          unsigned RemoveTQs,
                                          unsigned DiagID) {
// If this occurs outside a template instantiation, warn the user about
// it; they probably didn't mean to specify a redundant qualifier.
typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
                     QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
                     QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
                     QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
  if (!(RemoveTQs & Qual.first))
    continue;

  if (!S.inTemplateInstantiation()) {
    if (TypeQuals & Qual.first)
      S.Diag(Qual.second, DiagID)
        << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
        << FixItHint::CreateRemoval(Qual.second);
  }

  TypeQuals &= ~Qual.first;
}
796}

798/// Return true if this is omitted block return type. Also check type
799/// attributes and type qualifiers when returning true.
800static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
                                      QualType Result) {
if (!isOmittedBlockReturnType(declarator))
  return false;

// Warn if we see type attributes for omitted return type on a block literal.
SmallVector<ParsedAttr *, 2> ToBeRemoved;
for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
  if (AL.isInvalid() || !AL.isTypeAttr())
    continue;
  S.Diag(AL.getLoc(),
         diag::warn_block_literal_attributes_on_omitted_return_type)
      << AL;
  ToBeRemoved.push_back(&AL);
}
// Remove bad attributes from the list.
for (ParsedAttr *AL : ToBeRemoved)
  declarator.getMutableDeclSpec().getAttributes().remove(AL);

// Warn if we see type qualifiers for omitted return type on a block literal.
const DeclSpec &DS = declarator.getDeclSpec();
unsigned TypeQuals = DS.getTypeQualifiers();
diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
    diag::warn_block_literal_qualifiers_on_omitted_return_type);
declarator.getMutableDeclSpec().ClearTypeQualifiers();

return true;
827}

829/// Apply Objective-C type arguments to the given type.
830static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
                                ArrayRef<TypeSourceInfo *> typeArgs,
                                SourceRange typeArgsRange,
                                bool failOnError = false) {
// We can only apply type arguments to an Objective-C class type.
const auto *objcObjectType = type->getAs<ObjCObjectType>();
9
←
Assuming the object is a 'const class clang::ObjCObjectType *'→
if (!objcObjectType || !objcObjectType->getInterface()) {
10
←
Assuming 'objcObjectType' is non-null→
11
←
Assuming the condition is false→
12
←
Taking false branch→
  S.Diag(loc, diag::err_objc_type_args_non_class)
    << type
    << typeArgsRange;

  if (failOnError)
    return QualType();
  return type;
}

// The class type must be parameterized.
ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
if (!typeParams) {
13
←
Assuming 'typeParams' is non-null→
14
←
Taking false branch→
  S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
    << objcClass->getDeclName()
    << FixItHint::CreateRemoval(typeArgsRange);

  if (failOnError)
    return QualType();

  return type;
}

// The type must not already be specialized.
if (objcObjectType->isSpecialized()) {
15
←
Assuming the condition is false→
16
←
Taking false branch→
  S.Diag(loc, diag::err_objc_type_args_specialized_class)
    << type
    << FixItHint::CreateRemoval(typeArgsRange);

  if (failOnError)
    return QualType();

  return type;
}

// Check the type arguments.
SmallVector<QualType, 4> finalTypeArgs;
unsigned numTypeParams = typeParams->size();
bool anyPackExpansions = false;
for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
17
←
Assuming 'i' is not equal to 'n'→
18
←
Loop condition is true.  Entering loop body→
  TypeSourceInfo *typeArgInfo = typeArgs[i];
  QualType typeArg = typeArgInfo->getType();

  // Type arguments cannot have explicit qualifiers or nullability.
  // We ignore indirect sources of these, e.g. behind typedefs or
  // template arguments.
  if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
19
←
Assuming the condition is false→
20
←
Taking false branch→
    bool diagnosed = false;
    SourceRange rangeToRemove;
    if (auto attr = qual.getAs<AttributedTypeLoc>()) {
      rangeToRemove = attr.getLocalSourceRange();
      if (attr.getTypePtr()->getImmediateNullability()) {
        typeArg = attr.getTypePtr()->getModifiedType();
        S.Diag(attr.getBeginLoc(),
               diag::err_objc_type_arg_explicit_nullability)
            << typeArg << FixItHint::CreateRemoval(rangeToRemove);
        diagnosed = true;
      }
    }

    if (!diagnosed) {
      S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
          << typeArg << typeArg.getQualifiers().getAsString()
          << FixItHint::CreateRemoval(rangeToRemove);
    }
  }

  // Remove qualifiers even if they're non-local.
  typeArg = typeArg.getUnqualifiedType();

  finalTypeArgs.push_back(typeArg);

  if (typeArg->getAs<PackExpansionType>())
21
←
Assuming the object is not a 'const class clang::PackExpansionType *'→
22
←
Taking false branch→
    anyPackExpansions = true;

  // Find the corresponding type parameter, if there is one.
  ObjCTypeParamDecl *typeParam = nullptr;
  if (!anyPackExpansions22.1
'anyPackExpansions' is false
) {
23
←
Taking true branch→
    if (i < numTypeParams) {
24
←
Assuming 'i' is < 'numTypeParams'→
25
←
Taking true branch→
      typeParam = typeParams->begin()[i];
    } else {
      // Too many arguments.
      S.Diag(loc, diag::err_objc_type_args_wrong_arity)
        << false
        << objcClass->getDeclName()
        << (unsigned)typeArgs.size()
        << numTypeParams;
      S.Diag(objcClass->getLocation(), diag::note_previous_decl)
        << objcClass;

      if (failOnError)
        return QualType();

      return type;
    }
  }

  // Objective-C object pointer types must be substitutable for the bounds.
  if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
26
←
Assuming the object is a 'const class clang::ObjCObjectPointerType *'→
27
←
Assuming 'typeArgObjC' is non-null→
28
←
Taking true branch→
    // If we don't have a type parameter to match against, assume
    // everything is fine. There was a prior pack expansion that
    // means we won't be able to match anything.
    if (!typeParam) {
29
←
Assuming 'typeParam' is non-null→
30
←
Taking false branch→
      assert(anyPackExpansions && "Too many arguments?")(static_cast <bool> (anyPackExpansions && "Too many arguments?"
) ? void (0) : __assert_fail ("anyPackExpansions && \"Too many arguments?\""
, "clang/lib/Sema/SemaType.cpp", 940, __extension__ __PRETTY_FUNCTION__
));
      continue;
    }

    // Retrieve the bound.
    QualType bound = typeParam->getUnderlyingType();
    const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
31
←
Assuming the object is not a 'const class clang::ObjCObjectPointerType *'→
32
←
'boundObjC' initialized to a null pointer value→

    // Determine whether the type argument is substitutable for the bound.
    if (typeArgObjC->isObjCIdType()) {
33
←
Taking true branch→
      // When the type argument is 'id', the only acceptable type
      // parameter bound is 'id'.
      if (boundObjC->isObjCIdType())
34
←
Called C++ object pointer is null
        continue;
    } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
      // Otherwise, we follow the assignability rules.
      continue;
    }

    // Diagnose the mismatch.
    S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
           diag::err_objc_type_arg_does_not_match_bound)
        << typeArg << bound << typeParam->getDeclName();
    S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
      << typeParam->getDeclName();

    if (failOnError)
      return QualType();

    return type;
  }

  // Block pointer types are permitted for unqualified 'id' bounds.
  if (typeArg->isBlockPointerType()) {
    // If we don't have a type parameter to match against, assume
    // everything is fine. There was a prior pack expansion that
    // means we won't be able to match anything.
    if (!typeParam) {
      assert(anyPackExpansions && "Too many arguments?")(static_cast <bool> (anyPackExpansions && "Too many arguments?"
) ? void (0) : __assert_fail ("anyPackExpansions && \"Too many arguments?\""
, "clang/lib/Sema/SemaType.cpp", 978, __extension__ __PRETTY_FUNCTION__
));
      continue;
    }

    // Retrieve the bound.
    QualType bound = typeParam->getUnderlyingType();
    if (bound->isBlockCompatibleObjCPointerType(S.Context))
      continue;

    // Diagnose the mismatch.
    S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
           diag::err_objc_type_arg_does_not_match_bound)
        << typeArg << bound << typeParam->getDeclName();
    S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
      << typeParam->getDeclName();

    if (failOnError)
      return QualType();

    return type;
  }

  // Dependent types will be checked at instantiation time.
  if (typeArg->isDependentType()) {
    continue;
  }

  // Diagnose non-id-compatible type arguments.
  S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
         diag::err_objc_type_arg_not_id_compatible)
      << typeArg << typeArgInfo->getTypeLoc().getSourceRange();

  if (failOnError)
    return QualType();

  return type;
}

// Make sure we didn't have the wrong number of arguments.
if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
  S.Diag(loc, diag::err_objc_type_args_wrong_arity)
    << (typeArgs.size() < typeParams->size())
    << objcClass->getDeclName()
    << (unsigned)finalTypeArgs.size()
    << (unsigned)numTypeParams;
  S.Diag(objcClass->getLocation(), diag::note_previous_decl)
    << objcClass;

  if (failOnError)
    return QualType();

  return type;
}

// Success. Form the specialized type.
return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1034}

1036QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
                                    SourceLocation ProtocolLAngleLoc,
                                    ArrayRef<ObjCProtocolDecl *> Protocols,
                                    ArrayRef<SourceLocation> ProtocolLocs,
                                    SourceLocation ProtocolRAngleLoc,
                                    bool FailOnError) {
QualType Result = QualType(Decl->getTypeForDecl(), 0);
if (!Protocols.empty()) {
  bool HasError;
  Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
                                               HasError);
  if (HasError) {
    Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
      << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
    if (FailOnError) Result = QualType();
  }
  if (FailOnError && Result.isNull())
    return QualType();
}

return Result;
1057}

1059QualType Sema::BuildObjCObjectType(QualType BaseType,
                                 SourceLocation Loc,
                                 SourceLocation TypeArgsLAngleLoc,
                                 ArrayRef<TypeSourceInfo *> TypeArgs,
                                 SourceLocation TypeArgsRAngleLoc,
                                 SourceLocation ProtocolLAngleLoc,
                                 ArrayRef<ObjCProtocolDecl *> Protocols,
                                 ArrayRef<SourceLocation> ProtocolLocs,
                                 SourceLocation ProtocolRAngleLoc,
                                 bool FailOnError) {
QualType Result = BaseType;
if (!TypeArgs.empty()) {
6
←
Assuming the condition is true→
7
←
Taking true branch→
  Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
8
←
Calling 'applyObjCTypeArgs'→
                             SourceRange(TypeArgsLAngleLoc,
                                         TypeArgsRAngleLoc),
                             FailOnError);
  if (FailOnError && Result.isNull())
    return QualType();
}

if (!Protocols.empty()) {
  bool HasError;
  Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
                                               HasError);
  if (HasError) {
    Diag(Loc, diag::err_invalid_protocol_qualifiers)
      << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
    if (FailOnError) Result = QualType();
  }
  if (FailOnError && Result.isNull())
    return QualType();
}

return Result;
1093}

1095TypeResult Sema::actOnObjCProtocolQualifierType(
           SourceLocation lAngleLoc,
           ArrayRef<Decl *> protocols,
           ArrayRef<SourceLocation> protocolLocs,
           SourceLocation rAngleLoc) {
// Form id<protocol-list>.
QualType Result = Context.getObjCObjectType(
                    Context.ObjCBuiltinIdTy, { },
                    llvm::makeArrayRef(
                      (ObjCProtocolDecl * const *)protocols.data(),
                      protocols.size()),
                    false);
Result = Context.getObjCObjectPointerType(Result);

TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();

auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit

auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
                      .castAs<ObjCObjectTypeLoc>();
ObjCObjectTL.setHasBaseTypeAsWritten(false);
ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());

// No type arguments.
ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());

// Fill in protocol qualifiers.
ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
for (unsigned i = 0, n = protocols.size(); i != n; ++i)
  ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);

// We're done. Return the completed type to the parser.
return CreateParsedType(Result, ResultTInfo);
1132}

1134TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
           Scope *S,
           SourceLocation Loc,
           ParsedType BaseType,
           SourceLocation TypeArgsLAngleLoc,
           ArrayRef<ParsedType> TypeArgs,
           SourceLocation TypeArgsRAngleLoc,
           SourceLocation ProtocolLAngleLoc,
           ArrayRef<Decl *> Protocols,
           ArrayRef<SourceLocation> ProtocolLocs,
           SourceLocation ProtocolRAngleLoc) {
TypeSourceInfo *BaseTypeInfo = nullptr;
QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
if (T.isNull())
1
Taking false branch→
  return true;

// Handle missing type-source info.
if (!BaseTypeInfo1.1
'BaseTypeInfo' is null
)
2
←
Taking true branch→
  BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);

// Extract type arguments.
SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
3
←
Assuming 'i' is equal to 'n'→
4
←
Loop condition is false. Execution continues on line 1169→
  TypeSourceInfo *TypeArgInfo = nullptr;
  QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
  if (TypeArg.isNull()) {
    ActualTypeArgInfos.clear();
    break;
  }

  assert(TypeArgInfo && "No type source info?")(static_cast <bool> (TypeArgInfo && "No type source info?"
) ? void (0) : __assert_fail ("TypeArgInfo && \"No type source info?\""
, "clang/lib/Sema/SemaType.cpp", 1164, __extension__ __PRETTY_FUNCTION__
));
  ActualTypeArgInfos.push_back(TypeArgInfo);
}

// Build the object type.
QualType Result = BuildObjCObjectType(
5
←
Calling 'Sema::BuildObjCObjectType'→
    T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
    TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
    ProtocolLAngleLoc,
    llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
                       Protocols.size()),
    ProtocolLocs, ProtocolRAngleLoc,
    /*FailOnError=*/false);

if (Result == T)
  return BaseType;

// Create source information for this type.
TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
TypeLoc ResultTL = ResultTInfo->getTypeLoc();

// For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
// object pointer type. Fill in source information for it.
if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
  // The '*' is implicit.
  ObjCObjectPointerTL.setStarLoc(SourceLocation());
  ResultTL = ObjCObjectPointerTL.getPointeeLoc();
}

if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
  // Protocol qualifier information.
  if (OTPTL.getNumProtocols() > 0) {
    assert(OTPTL.getNumProtocols() == Protocols.size())(static_cast <bool> (OTPTL.getNumProtocols() == Protocols
.size()) ? void (0) : __assert_fail ("OTPTL.getNumProtocols() == Protocols.size()"
, "clang/lib/Sema/SemaType.cpp", 1196, __extension__ __PRETTY_FUNCTION__
));
    OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
    OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
    for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
      OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
  }

  // We're done. Return the completed type to the parser.
  return CreateParsedType(Result, ResultTInfo);
}

auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();

// Type argument information.
if (ObjCObjectTL.getNumTypeArgs() > 0) {
  assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size())(static_cast <bool> (ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos
.size()) ? void (0) : __assert_fail ("ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size()"
, "clang/lib/Sema/SemaType.cpp", 1211, __extension__ __PRETTY_FUNCTION__
));
  ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
  ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
  for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
    ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
} else {
  ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
  ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
}

// Protocol qualifier information.
if (ObjCObjectTL.getNumProtocols() > 0) {
  assert(ObjCObjectTL.getNumProtocols() == Protocols.size())(static_cast <bool> (ObjCObjectTL.getNumProtocols() == Protocols
.size()) ? void (0) : __assert_fail ("ObjCObjectTL.getNumProtocols() == Protocols.size()"
, "clang/lib/Sema/SemaType.cpp", 1223, __extension__ __PRETTY_FUNCTION__
));
  ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
  ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
  for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
    ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
} else {
  ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
  ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
}

// Base type.
ObjCObjectTL.setHasBaseTypeAsWritten(true);
if (ObjCObjectTL.getType() == T)
  ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
else
  ObjCObjectTL.getBaseLoc().initialize(Context, Loc);

// We're done. Return the completed type to the parser.
return CreateParsedType(Result, ResultTInfo);
1242}

1244static OpenCLAccessAttr::Spelling
1245getImageAccess(const ParsedAttributesView &Attrs) {
for (const ParsedAttr &AL : Attrs)
  if (AL.getKind() == ParsedAttr::AT_OpenCLAccess)
    return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling());
return OpenCLAccessAttr::Keyword_read_only;
1250}

1252static UnaryTransformType::UTTKind
1253TSTToUnaryTransformType(DeclSpec::TST SwitchTST) {
switch (SwitchTST) {
1255#define TRANSFORM_TYPE_TRAIT_DEF(Enum, Trait)                                  \
case TST_##Trait:                                                            \
  return UnaryTransformType::Enum;
1258#include "clang/Basic/TransformTypeTraits.def"
default:
  llvm_unreachable("attempted to parse a non-unary transform builtin")::llvm::llvm_unreachable_internal("attempted to parse a non-unary transform builtin"
, "clang/lib/Sema/SemaType.cpp", 1260);
}
1262}

1264/// Convert the specified declspec to the appropriate type
1265/// object.
1266/// \param state Specifies the declarator containing the declaration specifier
1267/// to be converted, along with other associated processing state.
1268/// \returns The type described by the declaration specifiers.  This function
1269/// never returns null.
1270static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
// FIXME: Should move the logic from DeclSpec::Finish to here for validity
// checking.

Sema &S = state.getSema();
Declarator &declarator = state.getDeclarator();
DeclSpec &DS = declarator.getMutableDeclSpec();
SourceLocation DeclLoc = declarator.getIdentifierLoc();
if (DeclLoc.isInvalid())
  DeclLoc = DS.getBeginLoc();

ASTContext &Context = S.Context;

QualType Result;
switch (DS.getTypeSpecType()) {
case DeclSpec::TST_void:
  Result = Context.VoidTy;
  break;
case DeclSpec::TST_char:
  if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
    Result = Context.CharTy;
  else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed)
    Result = Context.SignedCharTy;
  else {
    assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unsigned && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1295, __extension__ __PRETTY_FUNCTION__
))
           "Unknown TSS value")(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unsigned && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1295, __extension__ __PRETTY_FUNCTION__
));
    Result = Context.UnsignedCharTy;
  }
  break;
case DeclSpec::TST_wchar:
  if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
    Result = Context.WCharTy;
  else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed) {
    S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
      << DS.getSpecifierName(DS.getTypeSpecType(),
                             Context.getPrintingPolicy());
    Result = Context.getSignedWCharType();
  } else {
    assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unsigned && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1309, __extension__ __PRETTY_FUNCTION__
))
           "Unknown TSS value")(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unsigned && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1309, __extension__ __PRETTY_FUNCTION__
));
    S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
      << DS.getSpecifierName(DS.getTypeSpecType(),
                             Context.getPrintingPolicy());
    Result = Context.getUnsignedWCharType();
  }
  break;
case DeclSpec::TST_char8:
  assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1318, __extension__ __PRETTY_FUNCTION__
))
         "Unknown TSS value")(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1318, __extension__ __PRETTY_FUNCTION__
));
  Result = Context.Char8Ty;
  break;
case DeclSpec::TST_char16:
  assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1323, __extension__ __PRETTY_FUNCTION__
))
         "Unknown TSS value")(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1323, __extension__ __PRETTY_FUNCTION__
));
  Result = Context.Char16Ty;
  break;
case DeclSpec::TST_char32:
  assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1328, __extension__ __PRETTY_FUNCTION__
))
         "Unknown TSS value")(static_cast <bool> (DS.getTypeSpecSign() == TypeSpecifierSign
::Unspecified && "Unknown TSS value") ? void (0) : __assert_fail
 ("DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Unknown TSS value\""
, "clang/lib/Sema/SemaType.cpp", 1328, __extension__ __PRETTY_FUNCTION__
));
  Result = Context.Char32Ty;
  break;
case DeclSpec::TST_unspecified:
  // If this is a missing declspec in a block literal return context, then it
  // is inferred from the return statements inside the block.
  // The declspec is always missing in a lambda expr context; it is either
  // specified with a trailing return type or inferred.
  if (S.getLangOpts().CPlusPlus14 &&
      declarator.getContext() == DeclaratorContext::LambdaExpr) {
    // In C++1y, a lambda's implicit return type is 'auto'.
    Result = Context.getAutoDeductType();
    break;
  } else if (declarator.getContext() == DeclaratorContext::LambdaExpr ||
             checkOmittedBlockReturnType(S, declarator,
                                         Context.DependentTy)) {
    Result = Context.DependentTy;
    break;
  }

  // Unspecified typespec defaults to int in C90.  However, the C90 grammar
  // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
  // type-qualifier, or storage-class-specifier.  If not, emit an extwarn.
  // Note that the one exception to this is function definitions, which are
  // allowed to be completely missing a declspec.  This is handled in the
  // parser already though by it pretending to have seen an 'int' in this
  // case.
  if (S.getLangOpts().isImplicitIntRequired()) {
    S.Diag(DeclLoc, diag::warn_missing_type_specifier)
        << DS.getSourceRange()
        << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
  } else if (!DS.hasTypeSpecifier()) {
    // C99 and C++ require a type specifier.  For example, C99 6.7.2p2 says:
    // "At least one type specifier shall be given in the declaration
    // specifiers in each declaration, and in the specifier-qualifier list in
    // each struct declaration and type name."
    if (!S.getLangOpts().isImplicitIntAllowed() && !DS.isTypeSpecPipe()) {
      S.Diag(DeclLoc, diag::err_missing_type_specifier)
          << DS.getSourceRange();

      // When this occurs, often something is very broken with the value
      // being declared, poison it as invalid so we don't get chains of
      // errors.
      declarator.setInvalidType(true);
    } else if (S.getLangOpts().getOpenCLCompatibleVersion() >= 200 &&
               DS.isTypeSpecPipe()) {
      S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
          << DS.getSourceRange();
      declarator.setInvalidType(true);
    } else {
      assert(S.getLangOpts().isImplicitIntAllowed() &&(static_cast <bool> (S.getLangOpts().isImplicitIntAllowed
() && "implicit int is disabled?") ? void (0) : __assert_fail
 ("S.getLangOpts().isImplicitIntAllowed() && \"implicit int is disabled?\""
, "clang/lib/Sema/SemaType.cpp", 1379, __extension__ __PRETTY_FUNCTION__
))
             "implicit int is disabled?")(static_cast <bool> (S.getLangOpts().isImplicitIntAllowed
() && "implicit int is disabled?") ? void (0) : __assert_fail
 ("S.getLangOpts().isImplicitIntAllowed() && \"implicit int is disabled?\""
, "clang/lib/Sema/SemaType.cpp", 1379, __extension__ __PRETTY_FUNCTION__
));
      S.Diag(DeclLoc, diag::ext_missing_type_specifier)
          << DS.getSourceRange()
          << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
    }
  }

  [[fallthrough]];
case DeclSpec::TST_int: {
  if (DS.getTypeSpecSign() != TypeSpecifierSign::Unsigned) {
    switch (DS.getTypeSpecWidth()) {
    case TypeSpecifierWidth::Unspecified:
      Result = Context.IntTy;
      break;
    case TypeSpecifierWidth::Short:
      Result = Context.ShortTy;
      break;
    case TypeSpecifierWidth::Long:
      Result = Context.LongTy;
      break;
    case TypeSpecifierWidth::LongLong:
      Result = Context.LongLongTy;

      // 'long long' is a C99 or C++11 feature.
      if (!S.getLangOpts().C99) {
        if (S.getLangOpts().CPlusPlus)
          S.Diag(DS.getTypeSpecWidthLoc(),
                 S.getLangOpts().CPlusPlus11 ?
                 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
        else
          S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
      }
      break;
    }
  } else {
    switch (DS.getTypeSpecWidth()) {
    case TypeSpecifierWidth::Unspecified:
      Result = Context.UnsignedIntTy;
      break;
    case TypeSpecifierWidth::Short:
      Result = Context.UnsignedShortTy;
      break;
    case TypeSpecifierWidth::Long:
      Result = Context.UnsignedLongTy;
      break;
    case TypeSpecifierWidth::LongLong:
      Result = Context.UnsignedLongLongTy;

      // 'long long' is a C99 or C++11 feature.
      if (!S.getLangOpts().C99) {
        if (S.getLangOpts().CPlusPlus)
          S.Diag(DS.getTypeSpecWidthLoc(),
                 S.getLangOpts().CPlusPlus11 ?
                 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
        else
          S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
      }
      break;
    }
  }
  break;
}
case DeclSpec::TST_bitint: {
  if (!S.Context.getTargetInfo().hasBitIntType())
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "_BitInt";
  Result =
      S.BuildBitIntType(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned,
                        DS.getRepAsExpr(), DS.getBeginLoc());
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;
}
case DeclSpec::TST_accum: {
  switch (DS.getTypeSpecWidth()) {
  case TypeSpecifierWidth::Short:
    Result = Context.ShortAccumTy;
    break;
  case TypeSpecifierWidth::Unspecified:
    Result = Context.AccumTy;
    break;
  case TypeSpecifierWidth::Long:
    Result = Context.LongAccumTy;
    break;
  case TypeSpecifierWidth::LongLong:
    llvm_unreachable("Unable to specify long long as _Accum width")::llvm::llvm_unreachable_internal("Unable to specify long long as _Accum width"
, "clang/lib/Sema/SemaType.cpp", 1465);
  }

  if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
    Result = Context.getCorrespondingUnsignedType(Result);

  if (DS.isTypeSpecSat())
    Result = Context.getCorrespondingSaturatedType(Result);

  break;
}
case DeclSpec::TST_fract: {
  switch (DS.getTypeSpecWidth()) {
  case TypeSpecifierWidth::Short:
    Result = Context.ShortFractTy;
    break;
  case TypeSpecifierWidth::Unspecified:
    Result = Context.FractTy;
    break;
  case TypeSpecifierWidth::Long:
    Result = Context.LongFractTy;
    break;
  case TypeSpecifierWidth::LongLong:
    llvm_unreachable("Unable to specify long long as _Fract width")::llvm::llvm_unreachable_internal("Unable to specify long long as _Fract width"
, "clang/lib/Sema/SemaType.cpp", 1488);
  }

  if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
    Result = Context.getCorrespondingUnsignedType(Result);

  if (DS.isTypeSpecSat())
    Result = Context.getCorrespondingSaturatedType(Result);

  break;
}
case DeclSpec::TST_int128:
  if (!S.Context.getTargetInfo().hasInt128Type() &&
      !(S.getLangOpts().SYCLIsDevice || S.getLangOpts().CUDAIsDevice ||
        (S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice)))
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
      << "__int128";
  if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
    Result = Context.UnsignedInt128Ty;
  else
    Result = Context.Int128Ty;
  break;
case DeclSpec::TST_float16:
  // CUDA host and device may have different _Float16 support, therefore
  // do not diagnose _Float16 usage to avoid false alarm.
  // ToDo: more precise diagnostics for CUDA.
  if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA &&
      !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
      << "_Float16";
  Result = Context.Float16Ty;
  break;
case DeclSpec::TST_half:    Result = Context.HalfTy; break;
case DeclSpec::TST_BFloat16:
  if (!S.Context.getTargetInfo().hasBFloat16Type())
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
      << "__bf16";
  Result = Context.BFloat16Ty;
  break;
case DeclSpec::TST_float:   Result = Context.FloatTy; break;
case DeclSpec::TST_double:
  if (DS.getTypeSpecWidth() == TypeSpecifierWidth::Long)
    Result = Context.LongDoubleTy;
  else
    Result = Context.DoubleTy;
  if (S.getLangOpts().OpenCL) {
    if (!S.getOpenCLOptions().isSupported("cl_khr_fp64", S.getLangOpts()))
      S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
          << 0 << Result
          << (S.getLangOpts().getOpenCLCompatibleVersion() == 300
                  ? "cl_khr_fp64 and __opencl_c_fp64"
                  : "cl_khr_fp64");
    else if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp64", S.getLangOpts()))
      S.Diag(DS.getTypeSpecTypeLoc(), diag::ext_opencl_double_without_pragma);
  }
  break;
case DeclSpec::TST_float128:
  if (!S.Context.getTargetInfo().hasFloat128Type() &&
      !S.getLangOpts().SYCLIsDevice &&
      !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
      << "__float128";
  Result = Context.Float128Ty;
  break;
case DeclSpec::TST_ibm128:
  if (!S.Context.getTargetInfo().hasIbm128Type() &&
      !S.getLangOpts().SYCLIsDevice &&
      !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__ibm128";
  Result = Context.Ibm128Ty;
  break;
case DeclSpec::TST_bool:
  Result = Context.BoolTy; // _Bool or bool
  break;
case DeclSpec::TST_decimal32:    // _Decimal32
case DeclSpec::TST_decimal64:    // _Decimal64
case DeclSpec::TST_decimal128:   // _Decimal128
  S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
  Result = Context.IntTy;
  declarator.setInvalidType(true);
  break;
case DeclSpec::TST_class:
case DeclSpec::TST_enum:
case DeclSpec::TST_union:
case DeclSpec::TST_struct:
case DeclSpec::TST_interface: {
  TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl());
  if (!D) {
    // This can happen in C++ with ambiguous lookups.
    Result = Context.IntTy;
    declarator.setInvalidType(true);
    break;
  }

  // If the type is deprecated or unavailable, diagnose it.
  S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());

  assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "No qualifiers on tag names!") ? void (0) : __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"No qualifiers on tag names!\""
, "clang/lib/Sema/SemaType.cpp", 1588, __extension__ __PRETTY_FUNCTION__
))
         DS.getTypeSpecComplex() == 0 &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "No qualifiers on tag names!") ? void (0) : __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"No qualifiers on tag names!\""
, "clang/lib/Sema/SemaType.cpp", 1588, __extension__ __PRETTY_FUNCTION__
))
         DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "No qualifiers on tag names!") ? void (0) : __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"No qualifiers on tag names!\""
, "clang/lib/Sema/SemaType.cpp", 1588, __extension__ __PRETTY_FUNCTION__
))
         "No qualifiers on tag names!")(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "No qualifiers on tag names!") ? void (0) : __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"No qualifiers on tag names!\""
, "clang/lib/Sema/SemaType.cpp", 1588, __extension__ __PRETTY_FUNCTION__
));

  // TypeQuals handled by caller.
  Result = Context.getTypeDeclType(D);

  // In both C and C++, make an ElaboratedType.
  ElaboratedTypeKeyword Keyword
    = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
  Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result,
                               DS.isTypeSpecOwned() ? D : nullptr);
  break;
}
case DeclSpec::TST_typename: {
  assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "Can't handle qualifiers on typedef names yet!") ? void (0) :
 __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Can't handle qualifiers on typedef names yet!\""
, "clang/lib/Sema/SemaType.cpp", 1604, __extension__ __PRETTY_FUNCTION__
))
         DS.getTypeSpecComplex() == 0 &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "Can't handle qualifiers on typedef names yet!") ? void (0) :
 __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Can't handle qualifiers on typedef names yet!\""
, "clang/lib/Sema/SemaType.cpp", 1604, __extension__ __PRETTY_FUNCTION__
))
         DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "Can't handle qualifiers on typedef names yet!") ? void (0) :
 __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Can't handle qualifiers on typedef names yet!\""
, "clang/lib/Sema/SemaType.cpp", 1604, __extension__ __PRETTY_FUNCTION__
))
         "Can't handle qualifiers on typedef names yet!")(static_cast <bool> (DS.getTypeSpecWidth() == TypeSpecifierWidth
::Unspecified && DS.getTypeSpecComplex() == 0 &&
 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
 "Can't handle qualifiers on typedef names yet!") ? void (0) :
 __assert_fail ("DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified && \"Can't handle qualifiers on typedef names yet!\""
, "clang/lib/Sema/SemaType.cpp", 1604, __extension__ __PRETTY_FUNCTION__
));
  Result = S.GetTypeFromParser(DS.getRepAsType());
  if (Result.isNull()) {
    declarator.setInvalidType(true);
  }

  // TypeQuals handled by caller.
  break;
}
case DeclSpec::TST_typeof_unqualType:
case DeclSpec::TST_typeofType:
  // FIXME: Preserve type source info.
  Result = S.GetTypeFromParser(DS.getRepAsType());
  assert(!Result.isNull() && "Didn't get a type for typeof?")(static_cast <bool> (!Result.isNull() && "Didn't get a type for typeof?"
) ? void (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for typeof?\""
, "clang/lib/Sema/SemaType.cpp", 1617, __extension__ __PRETTY_FUNCTION__
));
  if (!Result->isDependentType())
    if (const TagType *TT = Result->getAs<TagType>())
      S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
  // TypeQuals handled by caller.
  Result = Context.getTypeOfType(
      Result, DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType
                  ? TypeOfKind::Unqualified
                  : TypeOfKind::Qualified);
  break;
case DeclSpec::TST_typeof_unqualExpr:
case DeclSpec::TST_typeofExpr: {
  Expr *E = DS.getRepAsExpr();
  assert(E && "Didn't get an expression for typeof?")(static_cast <bool> (E && "Didn't get an expression for typeof?"
) ? void (0) : __assert_fail ("E && \"Didn't get an expression for typeof?\""
, "clang/lib/Sema/SemaType.cpp", 1630, __extension__ __PRETTY_FUNCTION__
));
  // TypeQuals handled by caller.
  Result = S.BuildTypeofExprType(E, DS.getTypeSpecType() ==
                                            DeclSpec::TST_typeof_unqualExpr
                                        ? TypeOfKind::Unqualified
                                        : TypeOfKind::Qualified);
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;
}
case DeclSpec::TST_decltype: {
  Expr *E = DS.getRepAsExpr();
  assert(E && "Didn't get an expression for decltype?")(static_cast <bool> (E && "Didn't get an expression for decltype?"
) ? void (0) : __assert_fail ("E && \"Didn't get an expression for decltype?\""
, "clang/lib/Sema/SemaType.cpp", 1644, __extension__ __PRETTY_FUNCTION__
));
  // TypeQuals handled by caller.
  Result = S.BuildDecltypeType(E);
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;
}
1653#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case DeclSpec::TST_##Trait:
1654#include "clang/Basic/TransformTypeTraits.def"
  Result = S.GetTypeFromParser(DS.getRepAsType());
  assert(!Result.isNull() && "Didn't get a type for the transformation?")(static_cast <bool> (!Result.isNull() && "Didn't get a type for the transformation?"
) ? void (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for the transformation?\""
, "clang/lib/Sema/SemaType.cpp", 1656, __extension__ __PRETTY_FUNCTION__
));
  Result = S.BuildUnaryTransformType(
      Result, TSTToUnaryTransformType(DS.getTypeSpecType()),
      DS.getTypeSpecTypeLoc());
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;

case DeclSpec::TST_auto:
case DeclSpec::TST_decltype_auto: {
  auto AutoKW = DS.getTypeSpecType() == DeclSpec::TST_decltype_auto
                    ? AutoTypeKeyword::DecltypeAuto
                    : AutoTypeKeyword::Auto;

  ConceptDecl *TypeConstraintConcept = nullptr;
  llvm::SmallVector<TemplateArgument, 8> TemplateArgs;
  if (DS.isConstrainedAuto()) {
    if (TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId()) {
      TypeConstraintConcept =
          cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl());
      TemplateArgumentListInfo TemplateArgsInfo;
      TemplateArgsInfo.setLAngleLoc(TemplateId->LAngleLoc);
      TemplateArgsInfo.setRAngleLoc(TemplateId->RAngleLoc);
      ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                         TemplateId->NumArgs);
      S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
      for (const auto &ArgLoc : TemplateArgsInfo.arguments())
        TemplateArgs.push_back(ArgLoc.getArgument());
    } else {
      declarator.setInvalidType(true);
    }
  }
  Result = S.Context.getAutoType(QualType(), AutoKW,
                                 /*IsDependent*/ false, /*IsPack=*/false,
                                 TypeConstraintConcept, TemplateArgs);
  break;
}

case DeclSpec::TST_auto_type:
  Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
  break;

case DeclSpec::TST_unknown_anytype:
  Result = Context.UnknownAnyTy;
  break;

case DeclSpec::TST_atomic:
  Result = S.GetTypeFromParser(DS.getRepAsType());
  assert(!Result.isNull() && "Didn't get a type for _Atomic?")(static_cast <bool> (!Result.isNull() && "Didn't get a type for _Atomic?"
) ? void (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for _Atomic?\""
, "clang/lib/Sema/SemaType.cpp", 1706, __extension__ __PRETTY_FUNCTION__
));
  Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;

1714#define GENERIC_IMAGE_TYPE(ImgType, Id)                                        \
case DeclSpec::TST_##ImgType##_t:                                            \
  switch (getImageAccess(DS.getAttributes())) {                              \
  case OpenCLAccessAttr::Keyword_write_only:                                 \
    Result = Context.Id##WOTy;                                               \
    break;                                                                   \
  case OpenCLAccessAttr::Keyword_read_write:                                 \
    Result = Context.Id##RWTy;                                               \
    break;                                                                   \
  case OpenCLAccessAttr::Keyword_read_only:                                  \
    Result = Context.Id##ROTy;                                               \
    break;                                                                   \
  case OpenCLAccessAttr::SpellingNotCalculated:                              \
    llvm_unreachable("Spelling not yet calculated")::llvm::llvm_unreachable_internal("Spelling not yet calculated"
, "clang/lib/Sema/SemaType.cpp", 1727);                         \
  }                                                                          \
  break;
1730#include "clang/Basic/OpenCLImageTypes.def"

case DeclSpec::TST_error:
  Result = Context.IntTy;
  declarator.setInvalidType(true);
  break;
}

// FIXME: we want resulting declarations to be marked invalid, but claiming
// the type is invalid is too strong - e.g. it causes ActOnTypeName to return
// a null type.
if (Result->containsErrors())
  declarator.setInvalidType();

if (S.getLangOpts().OpenCL) {
  const auto &OpenCLOptions = S.getOpenCLOptions();
  bool IsOpenCLC30Compatible =
      S.getLangOpts().getOpenCLCompatibleVersion() == 300;
  // OpenCL C v3.0 s6.3.3 - OpenCL image types require __opencl_c_images
  // support.
  // OpenCL C v3.0 s6.2.1 - OpenCL 3d image write types requires support
  // for OpenCL C 2.0, or OpenCL C 3.0 or newer and the
  // __opencl_c_3d_image_writes feature. OpenCL C v3.0 API s4.2 - For devices
  // that support OpenCL 3.0, cl_khr_3d_image_writes must be returned when and
  // only when the optional feature is supported
  if ((Result->isImageType() || Result->isSamplerT()) &&
      (IsOpenCLC30Compatible &&
       !OpenCLOptions.isSupported("__opencl_c_images", S.getLangOpts()))) {
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
        << 0 << Result << "__opencl_c_images";
    declarator.setInvalidType();
  } else if (Result->isOCLImage3dWOType() &&
             !OpenCLOptions.isSupported("cl_khr_3d_image_writes",
                                        S.getLangOpts())) {
    S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
        << 0 << Result
        << (IsOpenCLC30Compatible
                ? "cl_khr_3d_image_writes and __opencl_c_3d_image_writes"
                : "cl_khr_3d_image_writes");
    declarator.setInvalidType();
  }
}

bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum ||
                        DS.getTypeSpecType() == DeclSpec::TST_fract;

// Only fixed point types can be saturated
if (DS.isTypeSpecSat() && !IsFixedPointType)
  S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec)
      << DS.getSpecifierName(DS.getTypeSpecType(),
                             Context.getPrintingPolicy());

// Handle complex types.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
  if (S.getLangOpts().Freestanding)
    S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
  Result = Context.getComplexType(Result);
} else if (DS.isTypeAltiVecVector()) {
  unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
  assert(typeSize > 0 && "type size for vector must be greater than 0 bits")(static_cast <bool> (typeSize > 0 && "type size for vector must be greater than 0 bits"
) ? void (0) : __assert_fail ("typeSize > 0 && \"type size for vector must be greater than 0 bits\""
, "clang/lib/Sema/SemaType.cpp", 1789, __extension__ __PRETTY_FUNCTION__
));
  VectorType::VectorKind VecKind = VectorType::AltiVecVector;
  if (DS.isTypeAltiVecPixel())
    VecKind = VectorType::AltiVecPixel;
  else if (DS.isTypeAltiVecBool())
    VecKind = VectorType::AltiVecBool;
  Result = Context.getVectorType(Result, 128/typeSize, VecKind);
}

// FIXME: Imaginary.
if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
  S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);

// Before we process any type attributes, synthesize a block literal
// function declarator if necessary.
if (declarator.getContext() == DeclaratorContext::BlockLiteral)
  maybeSynthesizeBlockSignature(state, Result);

// Apply any type attributes from the decl spec.  This may cause the
// list of type attributes to be temporarily saved while the type
// attributes are pushed around.
// pipe attributes will be handled later ( at GetFullTypeForDeclarator )
if (!DS.isTypeSpecPipe()) {
  // We also apply declaration attributes that "slide" to the decl spec.
  // Ordering can be important for attributes. The decalaration attributes
  // come syntactically before the decl spec attributes, so we process them
  // in that order.
  ParsedAttributesView SlidingAttrs;
  for (ParsedAttr &AL : declarator.getDeclarationAttributes()) {
    if (AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
      SlidingAttrs.addAtEnd(&AL);

      // For standard syntax attributes, which would normally appertain to the
      // declaration here, suggest moving them to the type instead. But only
      // do this for our own vendor attributes; moving other vendors'
      // attributes might hurt portability.
      // There's one special case that we need to deal with here: The
      // `MatrixType` attribute may only be used in a typedef declaration. If
      // it's being used anywhere else, don't output the warning as
      // ProcessDeclAttributes() will output an error anyway.
      if (AL.isStandardAttributeSyntax() && AL.isClangScope() &&
          !(AL.getKind() == ParsedAttr::AT_MatrixType &&
            DS.getStorageClassSpec() != DeclSpec::SCS_typedef)) {
        S.Diag(AL.getLoc(), diag::warn_type_attribute_deprecated_on_decl)
            << AL;
      }
    }
  }
  // During this call to processTypeAttrs(),
  // TypeProcessingState::getCurrentAttributes() will erroneously return a
  // reference to the DeclSpec attributes, rather than the declaration
  // attributes. However, this doesn't matter, as getCurrentAttributes()
  // is only called when distributing attributes from one attribute list
  // to another. Declaration attributes are always C++11 attributes, and these
  // are never distributed.
  processTypeAttrs(state, Result, TAL_DeclSpec, SlidingAttrs);
  processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes());
}

// Apply const/volatile/restrict qualifiers to T.
if (unsigned TypeQuals = DS.getTypeQualifiers()) {
  // Warn about CV qualifiers on function types.
  // C99 6.7.3p8:
  //   If the specification of a function type includes any type qualifiers,
  //   the behavior is undefined.
  // C++11 [dcl.fct]p7:
  //   The effect of a cv-qualifier-seq in a function declarator is not the
  //   same as adding cv-qualification on top of the function type. In the
  //   latter case, the cv-qualifiers are ignored.
  if (Result->isFunctionType()) {
    diagnoseAndRemoveTypeQualifiers(
        S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
        S.getLangOpts().CPlusPlus
            ? diag::warn_typecheck_function_qualifiers_ignored
            : diag::warn_typecheck_function_qualifiers_unspecified);
    // No diagnostic for 'restrict' or '_Atomic' applied to a
    // function type; we'll diagnose those later, in BuildQualifiedType.
  }

  // C++11 [dcl.ref]p1:
  //   Cv-qualified references are ill-formed except when the
  //   cv-qualifiers are introduced through the use of a typedef-name
  //   or decltype-specifier, in which case the cv-qualifiers are ignored.
  //
  // There don't appear to be any other contexts in which a cv-qualified
  // reference type could be formed, so the 'ill-formed' clause here appears
  // to never happen.
  if (TypeQuals && Result->isReferenceType()) {
    diagnoseAndRemoveTypeQualifiers(
        S, DS, TypeQuals, Result,
        DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
        diag::warn_typecheck_reference_qualifiers);
  }

  // C90 6.5.3 constraints: "The same type qualifier shall not appear more
  // than once in the same specifier-list or qualifier-list, either directly
  // or via one or more typedefs."
  if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
      && TypeQuals & Result.getCVRQualifiers()) {
    if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
      S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
        << "const";
    }

    if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
      S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
        << "volatile";
    }

    // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
    // produce a warning in this case.
  }

  QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);

  // If adding qualifiers fails, just use the unqualified type.
  if (Qualified.isNull())
    declarator.setInvalidType(true);
  else
    Result = Qualified;
}

assert(!Result.isNull() && "This function should not return a null type")(static_cast <bool> (!Result.isNull() && "This function should not return a null type"
) ? void (0) : __assert_fail ("!Result.isNull() && \"This function should not return a null type\""
, "clang/lib/Sema/SemaType.cpp", 1911, __extension__ __PRETTY_FUNCTION__
));
return Result;
1913}

1915static std::string getPrintableNameForEntity(DeclarationName Entity) {
if (Entity)
  return Entity.getAsString();

return "type name";
1920}

1922static bool isDependentOrGNUAutoType(QualType T) {
if (T->isDependentType())
  return true;

const auto *AT = dyn_cast<AutoType>(T);
return AT && AT->isGNUAutoType();
1928}

1930QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
                                Qualifiers Qs, const DeclSpec *DS) {
if (T.isNull())
  return QualType();

// Ignore any attempt to form a cv-qualified reference.
if (T->isReferenceType()) {
  Qs.removeConst();
  Qs.removeVolatile();
}

// Enforce C99 6.7.3p2: "Types other than pointer types derived from
// object or incomplete types shall not be restrict-qualified."
if (Qs.hasRestrict()) {
  unsigned DiagID = 0;
  QualType ProblemTy;

  if (T->isAnyPointerType() || T->isReferenceType() ||
      T->isMemberPointerType()) {
    QualType EltTy;
    if (T->isObjCObjectPointerType())
      EltTy = T;
    else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
      EltTy = PTy->getPointeeType();
    else
      EltTy = T->getPointeeType();

    // If we have a pointer or reference, the pointee must have an object
    // incomplete type.
    if (!EltTy->isIncompleteOrObjectType()) {
      DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
      ProblemTy = EltTy;
    }
  } else if (!isDependentOrGNUAutoType(T)) {
    // For an __auto_type variable, we may not have seen the initializer yet
    // and so have no idea whether the underlying type is a pointer type or
    // not.
    DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
    ProblemTy = T;
  }

  if (DiagID) {
    Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
    Qs.removeRestrict();
  }
}

return Context.getQualifiedType(T, Qs);
1978}

1980QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
                                unsigned CVRAU, const DeclSpec *DS) {
if (T.isNull())
  return QualType();

// Ignore any attempt to form a cv-qualified reference.
if (T->isReferenceType())
  CVRAU &=
      ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);

// Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
// TQ_unaligned;
unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);

// C11 6.7.3/5:
//   If the same qualifier appears more than once in the same
//   specifier-qualifier-list, either directly or via one or more typedefs,
//   the behavior is the same as if it appeared only once.
//
// It's not specified what happens when the _Atomic qualifier is applied to
// a type specified with the _Atomic specifier, but we assume that this
// should be treated as if the _Atomic qualifier appeared multiple times.
if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
  // C11 6.7.3/5:
  //   If other qualifiers appear along with the _Atomic qualifier in a
  //   specifier-qualifier-list, the resulting type is the so-qualified
  //   atomic type.
  //
  // Don't need to worry about array types here, since _Atomic can't be
  // applied to such types.
  SplitQualType Split = T.getSplitUnqualifiedType();
  T = BuildAtomicType(QualType(Split.Ty, 0),
                      DS ? DS->getAtomicSpecLoc() : Loc);
  if (T.isNull())
    return T;
  Split.Quals.addCVRQualifiers(CVR);
  return BuildQualifiedType(T, Loc, Split.Quals);
}

Qualifiers Q = Qualifiers::fromCVRMask(CVR);
Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
return BuildQualifiedType(T, Loc, Q, DS);
2022}

2024/// Build a paren type including \p T.
2025QualType Sema::BuildParenType(QualType T) {
return Context.getParenType(T);
2027}

2029/// Given that we're building a pointer or reference to the given
2030static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
                                         SourceLocation loc,
                                         bool isReference) {
// Bail out if retention is unrequired or already specified.
if (!type->isObjCLifetimeType() ||
    type.getObjCLifetime() != Qualifiers::OCL_None)
  return type;

Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;

// If the object type is const-qualified, we can safely use
// __unsafe_unretained.  This is safe (because there are no read
// barriers), and it'll be safe to coerce anything but __weak* to
// the resulting type.
if (type.isConstQualified()) {
  implicitLifetime = Qualifiers::OCL_ExplicitNone;

// Otherwise, check whether the static type does not require
// retaining.  This currently only triggers for Class (possibly
// protocol-qualifed, and arrays thereof).
} else if (type->isObjCARCImplicitlyUnretainedType()) {
  implicitLifetime = Qualifiers::OCL_ExplicitNone;

// If we are in an unevaluated context, like sizeof, skip adding a
// qualification.
} else if (S.isUnevaluatedContext()) {
  return type;

// If that failed, give an error and recover using __strong.  __strong
// is the option most likely to prevent spurious second-order diagnostics,
// like when binding a reference to a field.
} else {
  // These types can show up in private ivars in system headers, so
  // we need this to not be an error in those cases.  Instead we
  // want to delay.
  if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
    S.DelayedDiagnostics.add(
        sema::DelayedDiagnostic::makeForbiddenType(loc,
            diag::err_arc_indirect_no_ownership, type, isReference));
  } else {
    S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
  }
  implicitLifetime = Qualifiers::OCL_Strong;
}
assert(implicitLifetime && "didn't infer any lifetime!")(static_cast <bool> (implicitLifetime && "didn't infer any lifetime!"
) ? void (0) : __assert_fail ("implicitLifetime && \"didn't infer any lifetime!\""
, "clang/lib/Sema/SemaType.cpp", 2074, __extension__ __PRETTY_FUNCTION__
));

Qualifiers qs;
qs.addObjCLifetime(implicitLifetime);
return S.Context.getQualifiedType(type, qs);
2079}

2081static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
std::string Quals = FnTy->getMethodQuals().getAsString();

switch (FnTy->getRefQualifier()) {
case RQ_None:
  break;

case RQ_LValue:
  if (!Quals.empty())
    Quals += ' ';
  Quals += '&';
  break;

case RQ_RValue:
  if (!Quals.empty())
    Quals += ' ';
  Quals += "&&";
  break;
}

return Quals;
2102}

2104namespace {
2105/// Kinds of declarator that cannot contain a qualified function type.
2106///
2107/// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
2108///     a function type with a cv-qualifier or a ref-qualifier can only appear
2109///     at the topmost level of a type.
2110///
2111/// Parens and member pointers are permitted. We don't diagnose array and
2112/// function declarators, because they don't allow function types at all.
2113///
2114/// The values of this enum are used in diagnostics.
2115enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
2116} // end anonymous namespace

2118/// Check whether the type T is a qualified function type, and if it is,
2119/// diagnose that it cannot be contained within the given kind of declarator.
2120static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
                                 QualifiedFunctionKind QFK) {
// Does T refer to a function type with a cv-qualifier or a ref-qualifier?
const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
if (!FPT ||
    (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
  return false;

S.Diag(Loc, diag::err_compound_qualified_function_type)
  << QFK << isa<FunctionType>(T.IgnoreParens()) << T
  << getFunctionQualifiersAsString(FPT);
return true;
2132}

2134bool Sema::CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc) {
const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
if (!FPT ||
    (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
  return false;

Diag(Loc, diag::err_qualified_function_typeid)
    << T << getFunctionQualifiersAsString(FPT);
return true;
2143}

2145// Helper to deduce addr space of a pointee type in OpenCL mode.
2146static QualType deduceOpenCLPointeeAddrSpace(Sema &S, QualType PointeeType) {
if (!PointeeType->isUndeducedAutoType() && !PointeeType->isDependentType() &&
    !PointeeType->isSamplerT() &&
    !PointeeType.hasAddressSpace())
  PointeeType = S.getASTContext().getAddrSpaceQualType(
      PointeeType, S.getASTContext().getDefaultOpenCLPointeeAddrSpace());
return PointeeType;
2153}

2155/// Build a pointer type.
2156///
2157/// \param T The type to which we'll be building a pointer.
2158///
2159/// \param Loc The location of the entity whose type involves this
2160/// pointer type or, if there is no such entity, the location of the
2161/// type that will have pointer type.
2162///
2163/// \param Entity The name of the entity that involves the pointer
2164/// type, if known.
2165///
2166/// \returns A suitable pointer type, if there are no
2167/// errors. Otherwise, returns a NULL type.
2168QualType Sema::BuildPointerType(QualType T,
                              SourceLocation Loc, DeclarationName Entity) {
if (T->isReferenceType()) {
  // C++ 8.3.2p4: There shall be no ... pointers to references ...
  Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
    << getPrintableNameForEntity(Entity) << T;
  return QualType();
}

if (T->isFunctionType() && getLangOpts().OpenCL &&
    !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
                                          getLangOpts())) {
  Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
  return QualType();
}

if (getLangOpts().HLSL && Loc.isValid()) {
  Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
  return QualType();
}

if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
  return QualType();

assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType")(static_cast <bool> (!T->isObjCObjectType() &&
 "Should build ObjCObjectPointerType") ? void (0) : __assert_fail
 ("!T->isObjCObjectType() && \"Should build ObjCObjectPointerType\""
, "clang/lib/Sema/SemaType.cpp", 2192, __extension__ __PRETTY_FUNCTION__
));

// In ARC, it is forbidden to build pointers to unqualified pointers.
if (getLangOpts().ObjCAutoRefCount)
  T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);

if (getLangOpts().OpenCL)
  T = deduceOpenCLPointeeAddrSpace(*this, T);

// Build the pointer type.
return Context.getPointerType(T);
2203}

2205/// Build a reference type.
2206///
2207/// \param T The type to which we'll be building a reference.
2208///
2209/// \param Loc The location of the entity whose type involves this
2210/// reference type or, if there is no such entity, the location of the
2211/// type that will have reference type.
2212///
2213/// \param Entity The name of the entity that involves the reference
2214/// type, if known.
2215///
2216/// \returns A suitable reference type, if there are no
2217/// errors. Otherwise, returns a NULL type.
2218QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
                                SourceLocation Loc,
                                DeclarationName Entity) {
assert(Context.getCanonicalType(T) != Context.OverloadTy &&(static_cast <bool> (Context.getCanonicalType(T) != Context
.OverloadTy && "Unresolved overloaded function type")
 ? void (0) : __assert_fail ("Context.getCanonicalType(T) != Context.OverloadTy && \"Unresolved overloaded function type\""
, "clang/lib/Sema/SemaType.cpp", 2222, __extension__ __PRETTY_FUNCTION__
))
       "Unresolved overloaded function type")(static_cast <bool> (Context.getCanonicalType(T) != Context
.OverloadTy && "Unresolved overloaded function type")
 ? void (0) : __assert_fail ("Context.getCanonicalType(T) != Context.OverloadTy && \"Unresolved overloaded function type\""
, "clang/lib/Sema/SemaType.cpp", 2222, __extension__ __PRETTY_FUNCTION__
));

// C++0x [dcl.ref]p6:
//   If a typedef (7.1.3), a type template-parameter (14.3.1), or a
//   decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
//   type T, an attempt to create the type "lvalue reference to cv TR" creates
//   the type "lvalue reference to T", while an attempt to create the type
//   "rvalue reference to cv TR" creates the type TR.
bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();

// C++ [dcl.ref]p4: There shall be no references to references.
//
// According to C++ DR 106, references to references are only
// diagnosed when they are written directly (e.g., "int & &"),
// but not when they happen via a typedef:
//
//   typedef int& intref;
//   typedef intref& intref2;
//
// Parser::ParseDeclaratorInternal diagnoses the case where
// references are written directly; here, we handle the
// collapsing of references-to-references as described in C++0x.
// DR 106 and 540 introduce reference-collapsing into C++98/03.

// C++ [dcl.ref]p1:
//   A declarator that specifies the type "reference to cv void"
//   is ill-formed.
if (T->isVoidType()) {
  Diag(Loc, diag::err_reference_to_void);
  return QualType();
}

if (getLangOpts().HLSL && Loc.isValid()) {
  Diag(Loc, diag::err_hlsl_pointers_unsupported) << 1;
  return QualType();
}

if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
  return QualType();

if (T->isFunctionType() && getLangOpts().OpenCL &&
    !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
                                          getLangOpts())) {
  Diag(Loc, diag::err_opencl_function_pointer) << /*reference*/ 1;
  return QualType();
}

// In ARC, it is forbidden to build references to unqualified pointers.
if (getLangOpts().ObjCAutoRefCount)
  T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);

if (getLangOpts().OpenCL)
  T = deduceOpenCLPointeeAddrSpace(*this, T);

// Handle restrict on references.
if (LValueRef)
  return Context.getLValueReferenceType(T, SpelledAsLValue);
return Context.getRValueReferenceType(T);
2280}

2282/// Build a Read-only Pipe type.
2283///
2284/// \param T The type to which we'll be building a Pipe.
2285///
2286/// \param Loc We do not use it for now.
2287///
2288/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2289/// NULL type.
2290QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
return Context.getReadPipeType(T);
2292}

2294/// Build a Write-only Pipe type.
2295///
2296/// \param T The type to which we'll be building a Pipe.
2297///
2298/// \param Loc We do not use it for now.
2299///
2300/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2301/// NULL type.
2302QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
return Context.getWritePipeType(T);
2304}

2306/// Build a bit-precise integer type.
2307///
2308/// \param IsUnsigned Boolean representing the signedness of the type.
2309///
2310/// \param BitWidth Size of this int type in bits, or an expression representing
2311/// that.
2312///
2313/// \param Loc Location of the keyword.
2314QualType Sema::BuildBitIntType(bool IsUnsigned, Expr *BitWidth,
                             SourceLocation Loc) {
if (BitWidth->isInstantiationDependent())
  return Context.getDependentBitIntType(IsUnsigned, BitWidth);

llvm::APSInt Bits(32);
ExprResult ICE =
    VerifyIntegerConstantExpression(BitWidth, &Bits, /*FIXME*/ AllowFold);

if (ICE.isInvalid())
  return QualType();

size_t NumBits = Bits.getZExtValue();
if (!IsUnsigned && NumBits < 2) {
  Diag(Loc, diag::err_bit_int_bad_size) << 0;
  return QualType();
}

if (IsUnsigned && NumBits < 1) {
  Diag(Loc, diag::err_bit_int_bad_size) << 1;
  return QualType();
}

const TargetInfo &TI = getASTContext().getTargetInfo();
if (NumBits > TI.getMaxBitIntWidth()) {
  Diag(Loc, diag::err_bit_int_max_size)
      << IsUnsigned << static_cast<uint64_t>(TI.getMaxBitIntWidth());
  return QualType();
}

return Context.getBitIntType(IsUnsigned, NumBits);
2345}

2347/// Check whether the specified array bound can be evaluated using the relevant
2348/// language rules. If so, returns the possibly-converted expression and sets
2349/// SizeVal to the size. If not, but the expression might be a VLA bound,
2350/// returns ExprResult(). Otherwise, produces a diagnostic and returns
2351/// ExprError().
2352static ExprResult checkArraySize(Sema &S, Expr *&ArraySize,
                               llvm::APSInt &SizeVal, unsigned VLADiag,
                               bool VLAIsError) {
if (S.getLangOpts().CPlusPlus14 &&
    (VLAIsError ||
     !ArraySize->getType()->isIntegralOrUnscopedEnumerationType())) {
  // C++14 [dcl.array]p1:
  //   The constant-expression shall be a converted constant expression of
  //   type std::size_t.
  //
  // Don't apply this rule if we might be forming a VLA: in that case, we
  // allow non-constant expressions and constant-folding. We only need to use
  // the converted constant expression rules (to properly convert the source)
  // when the source expression is of class type.
  return S.CheckConvertedConstantExpression(
      ArraySize, S.Context.getSizeType(), SizeVal, Sema::CCEK_ArrayBound);
}

// If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
// (like gnu99, but not c99) accept any evaluatable value as an extension.
class VLADiagnoser : public Sema::VerifyICEDiagnoser {
public:
  unsigned VLADiag;
  bool VLAIsError;
  bool IsVLA = false;

  VLADiagnoser(unsigned VLADiag, bool VLAIsError)
      : VLADiag(VLADiag), VLAIsError(VLAIsError) {}

  Sema::SemaDiagnosticBuilder diagnoseNotICEType(Sema &S, SourceLocation Loc,
                                                 QualType T) override {
    return S.Diag(Loc, diag::err_array_size_non_int) << T;
  }

  Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S,
                                             SourceLocation Loc) override {
    IsVLA = !VLAIsError;
    return S.Diag(Loc, VLADiag);
  }

  Sema::SemaDiagnosticBuilder diagnoseFold(Sema &S,
                                           SourceLocation Loc) override {
    return S.Diag(Loc, diag::ext_vla_folded_to_constant);
  }
} Diagnoser(VLADiag, VLAIsError);

ExprResult R =
    S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser);
if (Diagnoser.IsVLA)
  return ExprResult();
return R;
2403}

2405bool Sema::checkArrayElementAlignment(QualType EltTy, SourceLocation Loc) {
EltTy = Context.getBaseElementType(EltTy);
if (EltTy->isIncompleteType() || EltTy->isDependentType() ||
    EltTy->isUndeducedType())
  return true;

CharUnits Size = Context.getTypeSizeInChars(EltTy);
CharUnits Alignment = Context.getTypeAlignInChars(EltTy);

if (Size.isMultipleOf(Alignment))
  return true;

Diag(Loc, diag::err_array_element_alignment)
    << EltTy << Size.getQuantity() << Alignment.getQuantity();
return false;
2420}

2422/// Build an array type.
2423///
2424/// \param T The type of each element in the array.
2425///
2426/// \param ASM C99 array size modifier (e.g., '*', 'static').
2427///
2428/// \param ArraySize Expression describing the size of the array.
2429///
2430/// \param Brackets The range from the opening '[' to the closing ']'.
2431///
2432/// \param Entity The name of the entity that involves the array
2433/// type, if known.
2434///
2435/// \returns A suitable array type, if there are no errors. Otherwise,
2436/// returns a NULL type.
2437QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
                            Expr *ArraySize, unsigned Quals,
                            SourceRange Brackets, DeclarationName Entity) {

SourceLocation Loc = Brackets.getBegin();
if (getLangOpts().CPlusPlus) {
  // C++ [dcl.array]p1:
  //   T is called the array element type; this type shall not be a reference
  //   type, the (possibly cv-qualified) type void, a function type or an
  //   abstract class type.
  //
  // C++ [dcl.array]p3:
  //   When several "array of" specifications are adjacent, [...] only the
  //   first of the constant expressions that specify the bounds of the arrays
  //   may be omitted.
  //
  // Note: function types are handled in the common path with C.
  if (T->isReferenceType()) {
    Diag(Loc, diag::err_illegal_decl_array_of_references)
    << getPrintableNameForEntity(Entity) << T;
    return QualType();
  }

  if (T->isVoidType() || T->isIncompleteArrayType()) {
    Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 0 << T;
    return QualType();
  }

  if (RequireNonAbstractType(Brackets.getBegin(), T,
                             diag::err_array_of_abstract_type))
    return QualType();

  // Mentioning a member pointer type for an array type causes us to lock in
  // an inheritance model, even if it's inside an unused typedef.
  if (Context.getTargetInfo().getCXXABI().isMicrosoft())
    if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
      if (!MPTy->getClass()->isDependentType())
        (void)isCompleteType(Loc, T);

} else {
  // C99 6.7.5.2p1: If the element type is an incomplete or function type,
  // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
  if (RequireCompleteSizedType(Loc, T,
                               diag::err_array_incomplete_or_sizeless_type))
    return QualType();
}

if (T->isSizelessType()) {
  Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 1 << T;
  return QualType();
}

if (T->isFunctionType()) {
  Diag(Loc, diag::err_illegal_decl_array_of_functions)
    << getPrintableNameForEntity(Entity) << T;
  return QualType();
}

if (const RecordType *EltTy = T->getAs<RecordType>()) {
  // If the element type is a struct or union that contains a variadic
  // array, accept it as a GNU extension: C99 6.7.2.1p2.
  if (EltTy->getDecl()->hasFlexibleArrayMember())
    Diag(Loc, diag::ext_flexible_array_in_array) << T;
} else if (T->isObjCObjectType()) {
  Diag(Loc, diag::err_objc_array_of_interfaces) << T;
  return QualType();
}

if (!checkArrayElementAlignment(T, Loc))
  return QualType();

// Do placeholder conversions on the array size expression.
if (ArraySize && ArraySize->hasPlaceholderType()) {
  ExprResult Result = CheckPlaceholderExpr(ArraySize);
  if (Result.isInvalid()) return QualType();
  ArraySize = Result.get();
}

// Do lvalue-to-rvalue conversions on the array size expression.
if (ArraySize && !ArraySize->isPRValue()) {
  ExprResult Result = DefaultLvalueConversion(ArraySize);
  if (Result.isInvalid())
    return QualType();

  ArraySize = Result.get();
}

// C99 6.7.5.2p1: The size expression shall have integer type.
// C++11 allows contextual conversions to such types.
if (!getLangOpts().CPlusPlus11 &&
    ArraySize && !ArraySize->isTypeDependent() &&
    !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
  Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
      << ArraySize->getType() << ArraySize->getSourceRange();
  return QualType();
}

// VLAs always produce at least a -Wvla diagnostic, sometimes an error.
unsigned VLADiag;
bool VLAIsError;
if (getLangOpts().OpenCL) {
  // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
  VLADiag = diag::err_opencl_vla;
  VLAIsError = true;
} else if (getLangOpts().C99) {
  VLADiag = diag::warn_vla_used;
  VLAIsError = false;
} else if (isSFINAEContext()) {
  VLADiag = diag::err_vla_in_sfinae;
  VLAIsError = true;
} else if (getLangOpts().OpenMP && isInOpenMPTaskUntiedContext()) {
  VLADiag = diag::err_openmp_vla_in_task_untied;
  VLAIsError = true;
} else {
  VLADiag = diag::ext_vla;
  VLAIsError = false;
}

llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
if (!ArraySize) {
  if (ASM == ArrayType::Star) {
    Diag(Loc, VLADiag);
    if (VLAIsError)
      return QualType();

    T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
  } else {
    T = Context.getIncompleteArrayType(T, ASM, Quals);
  }
} else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
  T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
} else {
  ExprResult R =
      checkArraySize(*this, ArraySize, ConstVal, VLADiag, VLAIsError);
  if (R.isInvalid())
    return QualType();

  if (!R.isUsable()) {
    // C99: an array with a non-ICE size is a VLA. We accept any expression
    // that we can fold to a non-zero positive value as a non-VLA as an
    // extension.
    T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
  } else if (!T->isDependentType() && !T->isIncompleteType() &&
             !T->isConstantSizeType()) {
    // C99: an array with an element type that has a non-constant-size is a
    // VLA.
    // FIXME: Add a note to explain why this isn't a VLA.
    Diag(Loc, VLADiag);
    if (VLAIsError)
      return QualType();
    T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
  } else {
    // C99 6.7.5.2p1: If the expression is a constant expression, it shall
    // have a value greater than zero.
    // In C++, this follows from narrowing conversions being disallowed.
    if (ConstVal.isSigned() && ConstVal.isNegative()) {
      if (Entity)
        Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size)
            << getPrintableNameForEntity(Entity)
            << ArraySize->getSourceRange();
      else
        Diag(ArraySize->getBeginLoc(),
             diag::err_typecheck_negative_array_size)
            << ArraySize->getSourceRange();
      return QualType();
    }
    if (ConstVal == 0) {
      // GCC accepts zero sized static arrays. We allow them when
      // we're not in a SFINAE context.
      Diag(ArraySize->getBeginLoc(),
           isSFINAEContext() ? diag::err_typecheck_zero_array_size
                             : diag::ext_typecheck_zero_array_size)
          << 0 << ArraySize->getSourceRange();
    }

    // Is the array too large?
    unsigned ActiveSizeBits =
        (!T->isDependentType() && !T->isVariablyModifiedType() &&
         !T->isIncompleteType() && !T->isUndeducedType())
            ? ConstantArrayType::getNumAddressingBits(Context, T, ConstVal)
            : ConstVal.getActiveBits();
    if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
      Diag(ArraySize->getBeginLoc(), diag::err_array_too_large)
          << toString(ConstVal, 10) << ArraySize->getSourceRange();
      return QualType();
    }

    T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
  }
}

if (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) {
  // CUDA device code and some other targets don't support VLAs.
  targetDiag(Loc, (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
                      ? diag::err_cuda_vla
                      : diag::err_vla_unsupported)
      << ((getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
              ? CurrentCUDATarget()
              : CFT_InvalidTarget);
}

// If this is not C99, diagnose array size modifiers on non-VLAs.
if (!getLangOpts().C99 && !T->isVariableArrayType() &&
    (ASM != ArrayType::Normal || Quals != 0)) {
  Diag(Loc, getLangOpts().CPlusPlus ? diag::err_c99_array_usage_cxx
                                    : diag::ext_c99_array_usage)
      << ASM;
}

// OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
// OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
// OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
if (getLangOpts().OpenCL) {
  const QualType ArrType = Context.getBaseElementType(T);
  if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
      ArrType->isSamplerT() || ArrType->isImageType()) {
    Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
    return QualType();
  }
}

return T;
2659}

2661QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr,
                             SourceLocation AttrLoc) {
// The base type must be integer (not Boolean or enumeration) or float, and
// can't already be a vector.
if ((!CurType->isDependentType() &&
     (!CurType->isBuiltinType() || CurType->isBooleanType() ||
      (!CurType->isIntegerType() && !CurType->isRealFloatingType())) &&
     !CurType->isBitIntType()) ||
    CurType->isArrayType()) {
  Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType;
  return QualType();
}
// Only support _BitInt elements with byte-sized power of 2 NumBits.
if (CurType->isBitIntType()) {
  unsigned NumBits = CurType->getAs<BitIntType>()->getNumBits();
  if (!llvm::isPowerOf2_32(NumBits) || NumBits < 8) {
    Diag(AttrLoc, diag::err_attribute_invalid_bitint_vector_type)
        << (NumBits < 8);
    return QualType();
  }
}

if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent())
  return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
                                             VectorType::GenericVector);

Optional<llvm::APSInt> VecSize = SizeExpr->getIntegerConstantExpr(Context);
if (!VecSize) {
  Diag(AttrLoc, diag::err_attribute_argument_type)
      << "vector_size" << AANT_ArgumentIntegerConstant
      << SizeExpr->getSourceRange();
  return QualType();
}

if (CurType->isDependentType())
  return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
                                             VectorType::GenericVector);

// vecSize is specified in bytes - convert to bits.
if (!VecSize->isIntN(61)) {
  // Bit size will overflow uint64.
  Diag(AttrLoc, diag::err_attribute_size_too_large)
      << SizeExpr->getSourceRange() << "vector";
  return QualType();
}
uint64_t VectorSizeBits = VecSize->getZExtValue() * 8;
unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType));

if (VectorSizeBits == 0) {
  Diag(AttrLoc, diag::err_attribute_zero_size)
      << SizeExpr->getSourceRange() << "vector";
  return QualType();
}

if (!TypeSize || VectorSizeBits % TypeSize) {
  Diag(AttrLoc, diag::err_attribute_invalid_size)
      << SizeExpr->getSourceRange();
  return QualType();
}

if (VectorSizeBits / TypeSize > std::numeric_limits<uint32_t>::max()) {
  Diag(AttrLoc, diag::err_attribute_size_too_large)
      << SizeExpr->getSourceRange() << "vector";
  return QualType();
}

return Context.getVectorType(CurType, VectorSizeBits / TypeSize,
                             VectorType::GenericVector);
2729}

2731/// Build an ext-vector type.
2732///
2733/// Run the required checks for the extended vector type.
2734QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
                                SourceLocation AttrLoc) {
// Unlike gcc's vector_size attribute, we do not allow vectors to be defined
// in conjunction with complex types (pointers, arrays, functions, etc.).
//
// Additionally, OpenCL prohibits vectors of booleans (they're considered a
// reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
// on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
// of bool aren't allowed.
//
// We explictly allow bool elements in ext_vector_type for C/C++.
bool IsNoBoolVecLang = getLangOpts().OpenCL || getLangOpts().OpenCLCPlusPlus;
if ((!T->isDependentType() && !T->isIntegerType() &&
     !T->isRealFloatingType()) ||
    (IsNoBoolVecLang && T->isBooleanType())) {
  Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
  return QualType();
}

// Only support _BitInt elements with byte-sized power of 2 NumBits.
if (T->isBitIntType()) {
  unsigned NumBits = T->getAs<BitIntType>()->getNumBits();
  if (!llvm::isPowerOf2_32(NumBits) || NumBits < 8) {
    Diag(AttrLoc, diag::err_attribute_invalid_bitint_vector_type)
        << (NumBits < 8);
    return QualType();
  }
}

if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
  Optional<llvm::APSInt> vecSize = ArraySize->getIntegerConstantExpr(Context);
  if (!vecSize) {
    Diag(AttrLoc, diag::err_attribute_argument_type)
      << "ext_vector_type" << AANT_ArgumentIntegerConstant
      << ArraySize->getSourceRange();
    return QualType();
  }

  if (!vecSize->isIntN(32)) {
    Diag(AttrLoc, diag::err_attribute_size_too_large)
        << ArraySize->getSourceRange() << "vector";
    return QualType();
  }
  // Unlike gcc's vector_size attribute, the size is specified as the
  // number of elements, not the number of bytes.
  unsigned vectorSize = static_cast<unsigned>(vecSize->getZExtValue());

  if (vectorSize == 0) {
    Diag(AttrLoc, diag::err_attribute_zero_size)
        << ArraySize->getSourceRange() << "vector";
    return QualType();
  }

  return Context.getExtVectorType(T, vectorSize);
}

return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2791}

2793QualType Sema::BuildMatrixType(QualType ElementTy, Expr *NumRows, Expr *NumCols,
                             SourceLocation AttrLoc) {
assert(Context.getLangOpts().MatrixTypes &&(static_cast <bool> (Context.getLangOpts().MatrixTypes &&
 "Should never build a matrix type when it is disabled") ? void
 (0) : __assert_fail ("Context.getLangOpts().MatrixTypes && \"Should never build a matrix type when it is disabled\""
, "clang/lib/Sema/SemaType.cpp", 2796, __extension__ __PRETTY_FUNCTION__
))
       "Should never build a matrix type when it is disabled")(static_cast <bool> (Context.getLangOpts().MatrixTypes &&
 "Should never build a matrix type when it is disabled") ? void
 (0) : __assert_fail ("Context.getLangOpts().MatrixTypes && \"Should never build a matrix type when it is disabled\""
, "clang/lib/Sema/SemaType.cpp", 2796, __extension__ __PRETTY_FUNCTION__
));

// Check element type, if it is not dependent.
if (!ElementTy->isDependentType() &&
    !MatrixType::isValidElementType(ElementTy)) {
  Diag(AttrLoc, diag::err_attribute_invalid_matrix_type) << ElementTy;
  return QualType();
}

if (NumRows->isTypeDependent() || NumCols->isTypeDependent() ||
    NumRows->isValueDependent() || NumCols->isValueDependent())
  return Context.getDependentSizedMatrixType(ElementTy, NumRows, NumCols,
                                             AttrLoc);

Optional<llvm::APSInt> ValueRows = NumRows->getIntegerConstantExpr(Context);
Optional<llvm::APSInt> ValueColumns =
    NumCols->getIntegerConstantExpr(Context);

auto const RowRange = NumRows->getSourceRange();
auto const ColRange = NumCols->getSourceRange();

// Both are row and column expressions are invalid.
if (!ValueRows && !ValueColumns) {
  Diag(AttrLoc, diag::err_attribute_argument_type)
      << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange
      << ColRange;
  return QualType();
}

// Only the row expression is invalid.
if (!ValueRows) {
  Diag(AttrLoc, diag::err_attribute_argument_type)
      << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange;
  return QualType();
}

// Only the column expression is invalid.
if (!ValueColumns) {
  Diag(AttrLoc, diag::err_attribute_argument_type)
      << "matrix_type" << AANT_ArgumentIntegerConstant << ColRange;
  return QualType();
}

// Check the matrix dimensions.
unsigned MatrixRows = static_cast<unsigned>(ValueRows->getZExtValue());
unsigned MatrixColumns = static_cast<unsigned>(ValueColumns->getZExtValue());
if (MatrixRows == 0 && MatrixColumns == 0) {
  Diag(AttrLoc, diag::err_attribute_zero_size)
      << "matrix" << RowRange << ColRange;
  return QualType();
}
if (MatrixRows == 0) {
  Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << RowRange;
  return QualType();
}
if (MatrixColumns == 0) {
  Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << ColRange;
  return QualType();
}
if (!ConstantMatrixType::isDimensionValid(MatrixRows)) {
  Diag(AttrLoc, diag::err_attribute_size_too_large)
      << RowRange << "matrix row";
  return QualType();
}
if (!ConstantMatrixType::isDimensionValid(MatrixColumns)) {
  Diag(AttrLoc, diag::err_attribute_size_too_large)
      << ColRange << "matrix column";
  return QualType();
}
return Context.getConstantMatrixType(ElementTy, MatrixRows, MatrixColumns);
2866}

2868bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
if (T->isArrayType() || T->isFunctionType()) {
  Diag(Loc, diag::err_func_returning_array_function)
    << T->isFunctionType() << T;
  return true;
}

// Functions cannot return half FP.
if (T->isHalfType() && !getLangOpts().NativeHalfArgsAndReturns &&
    !Context.getTargetInfo().allowHalfArgsAndReturns()) {
  Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
    FixItHint::CreateInsertion(Loc, "*");
  return true;
}

// Methods cannot return interface types. All ObjC objects are
// passed by reference.
if (T->isObjCObjectType()) {
  Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
      << 0 << T << FixItHint::CreateInsertion(Loc, "*");
  return true;
}

if (T.hasNonTrivialToPrimitiveDestructCUnion() ||
    T.hasNonTrivialToPrimitiveCopyCUnion())
  checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn,
                        NTCUK_Destruct|NTCUK_Copy);

// C++2a [dcl.fct]p12:
//   A volatile-qualified return type is deprecated
if (T.isVolatileQualified() && getLangOpts().CPlusPlus20)
  Diag(Loc, diag::warn_deprecated_volatile_return) << T;

return false;
2902}

2904/// Check the extended parameter information.  Most of the necessary
2905/// checking should occur when applying the parameter attribute; the
2906/// only other checks required are positional restrictions.
2907static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
                  const FunctionProtoType::ExtProtoInfo &EPI,
                  llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
assert(EPI.ExtParameterInfos && "shouldn't get here without param infos")(static_cast <bool> (EPI.ExtParameterInfos && "shouldn't get here without param infos"
) ? void (0) : __assert_fail ("EPI.ExtParameterInfos && \"shouldn't get here without param infos\""
, "clang/lib/Sema/SemaType.cpp", 2910, __extension__ __PRETTY_FUNCTION__
));

bool emittedError = false;
auto actualCC = EPI.ExtInfo.getCC();
enum class RequiredCC { OnlySwift, SwiftOrSwiftAsync };
auto checkCompatible = [&](unsigned paramIndex, RequiredCC required) {
  bool isCompatible =
      (required == RequiredCC::OnlySwift)
          ? (actualCC == CC_Swift)
          : (actualCC == CC_Swift || actualCC == CC_SwiftAsync);
  if (isCompatible || emittedError)
    return;
  S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
      << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI())
      << (required == RequiredCC::OnlySwift);
  emittedError = true;
};
for (size_t paramIndex = 0, numParams = paramTypes.size();
        paramIndex != numParams; ++paramIndex) {
  switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
  // Nothing interesting to check for orindary-ABI parameters.
  case ParameterABI::Ordinary:
    continue;

  // swift_indirect_result parameters must be a prefix of the function
  // arguments.
  case ParameterABI::SwiftIndirectResult:
    checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
    if (paramIndex != 0 &&
        EPI.ExtParameterInfos[paramIndex - 1].getABI()
          != ParameterABI::SwiftIndirectResult) {
      S.Diag(getParamLoc(paramIndex),
             diag::err_swift_indirect_result_not_first);
    }
    continue;

  case ParameterABI::SwiftContext:
    checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
    continue;

  // SwiftAsyncContext is not limited to swiftasynccall functions.
  case ParameterABI::SwiftAsyncContext:
    continue;

  // swift_error parameters must be preceded by a swift_context parameter.
  case ParameterABI::SwiftErrorResult:
    checkCompatible(paramIndex, RequiredCC::OnlySwift);
    if (paramIndex == 0 ||
        EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
            ParameterABI::SwiftContext) {
      S.Diag(getParamLoc(paramIndex),
             diag::err_swift_error_result_not_after_swift_context);
    }
    continue;
  }
  llvm_unreachable("bad ABI kind")::llvm::llvm_unreachable_internal("bad ABI kind", "clang/lib/Sema/SemaType.cpp"
, 2965);
}
2967}

2969QualType Sema::BuildFunctionType(QualType T,
                               MutableArrayRef<QualType> ParamTypes,
                               SourceLocation Loc, DeclarationName Entity,
                               const FunctionProtoType::ExtProtoInfo &EPI) {
bool Invalid = false;

Invalid |= CheckFunctionReturnType(T, Loc);

for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
  // FIXME: Loc is too inprecise here, should use proper locations for args.
  QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
  if (ParamType->isVoidType()) {
    Diag(Loc, diag::err_param_with_void_type);
    Invalid = true;
  } else if (ParamType->isHalfType() && !getLangOpts().NativeHalfArgsAndReturns &&
             !Context.getTargetInfo().allowHalfArgsAndReturns()) {
    // Disallow half FP arguments.
    Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
      FixItHint::CreateInsertion(Loc, "*");
    Invalid = true;
  }

  // C++2a [dcl.fct]p4:
  //   A parameter with volatile-qualified type is deprecated
  if (ParamType.isVolatileQualified() && getLangOpts().CPlusPlus20)
    Diag(Loc, diag::warn_deprecated_volatile_param) << ParamType;

  ParamTypes[Idx] = ParamType;
}

if (EPI.ExtParameterInfos) {
  checkExtParameterInfos(*this, ParamTypes, EPI,
                         [=](unsigned i) { return Loc; });
}

if (EPI.ExtInfo.getProducesResult()) {
  // This is just a warning, so we can't fail to build if we see it.
  checkNSReturnsRetainedReturnType(Loc, T);
}

if (Invalid)
  return QualType();

return Context.getFunctionType(T, ParamTypes, EPI);
3013}

3015/// Build a member pointer type \c T Class::*.
3016///
3017/// \param T the type to which the member pointer refers.
3018/// \param Class the class type into which the member pointer points.
3019/// \param Loc the location where this type begins
3020/// \param Entity the name of the entity that will have this member pointer type
3021///
3022/// \returns a member pointer type, if successful, or a NULL type if there was
3023/// an error.
3024QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
                                    SourceLocation Loc,
                                    DeclarationName Entity) {
// Verify that we're not building a pointer to pointer to function with
// exception specification.
if (CheckDistantExceptionSpec(T)) {
  Diag(Loc, diag::err_distant_exception_spec);
  return QualType();
}

// C++ 8.3.3p3: A pointer to member shall not point to ... a member
//   with reference type, or "cv void."
if (T->isReferenceType()) {
  Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
    << getPrintableNameForEntity(Entity) << T;
  return QualType();
}

if (T->isVoidType()) {
  Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
    << getPrintableNameForEntity(Entity);
  return QualType();
}

if (!Class->isDependentType() && !Class->isRecordType()) {
  Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
  return QualType();
}

if (T->isFunctionType() && getLangOpts().OpenCL &&
    !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
                                          getLangOpts())) {
  Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
  return QualType();
}

if (getLangOpts().HLSL && Loc.isValid()) {
  Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
  return QualType();
}

// Adjust the default free function calling convention to the default method
// calling convention.
bool IsCtorOrDtor =
    (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
    (Entity.getNameKind() == DeclarationName::CXXDestructorName);
if (T->isFunctionType())
  adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);

return Context.getMemberPointerType(T, Class.getTypePtr());
3074}

3076/// Build a block pointer type.
3077///
3078/// \param T The type to which we'll be building a block pointer.
3079///
3080/// \param Loc The source location, used for diagnostics.
3081///
3082/// \param Entity The name of the entity that involves the block pointer
3083/// type, if known.
3084///
3085/// \returns A suitable block pointer type, if there are no
3086/// errors. Otherwise, returns a NULL type.
3087QualType Sema::BuildBlockPointerType(QualType T,
                                   SourceLocation Loc,
                                   DeclarationName Entity) {
if (!T->isFunctionType()) {
  Diag(Loc, diag::err_nonfunction_block_type);
  return QualType();
}

if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
  return QualType();

if (getLangOpts().OpenCL)
  T = deduceOpenCLPointeeAddrSpace(*this, T);

return Context.getBlockPointerType(T);
3102}

3104QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
QualType QT = Ty.get();
if (QT.isNull()) {
  if (TInfo) *TInfo = nullptr;
  return QualType();
}

TypeSourceInfo *DI = nullptr;
if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
  QT = LIT->getType();
  DI = LIT->getTypeSourceInfo();
}

if (TInfo) *TInfo = DI;
return QT;
3119}

3121static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
                                          Qualifiers::ObjCLifetime ownership,
                                          unsigned chunkIndex);

3125/// Given that this is the declaration of a parameter under ARC,
3126/// attempt to infer attributes and such for pointer-to-whatever
3127/// types.
3128static void inferARCWriteback(TypeProcessingState &state,
                            QualType &declSpecType) {
Sema &S = state.getSema();
Declarator &declarator = state.getDeclarator();

// TODO: should we care about decl qualifiers?

// Check whether the declarator has the expected form.  We walk
// from the inside out in order to make the block logic work.
unsigned outermostPointerIndex = 0;
bool isBlockPointer = false;
unsigned numPointers = 0;
for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
  unsigned chunkIndex = i;
  DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
  switch (chunk.Kind) {
  case DeclaratorChunk::Paren:
    // Ignore parens.
    break;

  case DeclaratorChunk::Reference:
  case DeclaratorChunk::Pointer:
    // Count the number of pointers.  Treat references
    // interchangeably as pointers; if they're mis-ordered, normal
    // type building will discover that.
    outermostPointerIndex = chunkIndex;
    numPointers++;
    break;

  case DeclaratorChunk::BlockPointer:
    // If we have a pointer to block pointer, that's an acceptable
    // indirect reference; anything else is not an application of
    // the rules.
    if (numPointers != 1) return;
    numPointers++;
    outermostPointerIndex = chunkIndex;
    isBlockPointer = true;

    // We don't care about pointer structure in return values here.
    goto done;

  case DeclaratorChunk::Array: // suppress if written (id[])?
  case DeclaratorChunk::Function:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    return;
  }
}
done:

// If we have *one* pointer, then we want to throw the qualifier on
// the declaration-specifiers, which means that it needs to be a
// retainable object type.
if (numPointers == 1) {
  // If it's not a retainable object type, the rule doesn't apply.
  if (!declSpecType->isObjCRetainableType()) return;

  // If it already has lifetime, don't do anything.
  if (declSpecType.getObjCLifetime()) return;

  // Otherwise, modify the type in-place.
  Qualifiers qs;

  if (declSpecType->isObjCARCImplicitlyUnretainedType())
    qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
  else
    qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
  declSpecType = S.Context.getQualifiedType(declSpecType, qs);

// If we have *two* pointers, then we want to throw the qualifier on
// the outermost pointer.
} else if (numPointers == 2) {
  // If we don't have a block pointer, we need to check whether the
  // declaration-specifiers gave us something that will turn into a
  // retainable object pointer after we slap the first pointer on it.
  if (!isBlockPointer && !declSpecType->isObjCObjectType())
    return;

  // Look for an explicit lifetime attribute there.
  DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
  if (chunk.Kind != DeclaratorChunk::Pointer &&
      chunk.Kind != DeclaratorChunk::BlockPointer)
    return;
  for (const ParsedAttr &AL : chunk.getAttrs())
    if (AL.getKind() == ParsedAttr::AT_ObjCOwnership)
      return;

  transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
                                        outermostPointerIndex);

// Any other number of pointers/references does not trigger the rule.
} else return;

// TODO: mark whether we did this inference?
3222}

3224void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
                                   SourceLocation FallbackLoc,
                                   SourceLocation ConstQualLoc,
                                   SourceLocation VolatileQualLoc,
                                   SourceLocation RestrictQualLoc,
                                   SourceLocation AtomicQualLoc,
                                   SourceLocation UnalignedQualLoc) {
if (!Quals)
  return;

struct Qual {
  const char *Name;
  unsigned Mask;
  SourceLocation Loc;
} const QualKinds[5] = {
  { "const", DeclSpec::TQ_const, ConstQualLoc },
  { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
  { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
  { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
  { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
};

SmallString<32> QualStr;
unsigned NumQuals = 0;
SourceLocation Loc;
FixItHint FixIts[5];

// Build a string naming the redundant qualifiers.
for (auto &E : QualKinds) {
  if (Quals & E.Mask) {
    if (!QualStr.empty()) QualStr += ' ';
    QualStr += E.Name;

    // If we have a location for the qualifier, offer a fixit.
    SourceLocation QualLoc = E.Loc;
    if (QualLoc.isValid()) {
      FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
      if (Loc.isInvalid() ||
          getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
        Loc = QualLoc;
    }

    ++NumQuals;
  }
}

Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
  << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
3272}

3274// Diagnose pointless type qualifiers on the return type of a function.
3275static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
                                                Declarator &D,
                                                unsigned FunctionChunkIndex) {
const DeclaratorChunk::FunctionTypeInfo &FTI =
    D.getTypeObject(FunctionChunkIndex).Fun;
if (FTI.hasTrailingReturnType()) {
  S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
                              RetTy.getLocalCVRQualifiers(),
                              FTI.getTrailingReturnTypeLoc());
  return;
}

for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
              End = D.getNumTypeObjects();
     OuterChunkIndex != End; ++OuterChunkIndex) {
  DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
  switch (OuterChunk.Kind) {
  case DeclaratorChunk::Paren:
    continue;

  case DeclaratorChunk::Pointer: {
    DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
    S.diagnoseIgnoredQualifiers(
        diag::warn_qual_return_type,
        PTI.TypeQuals,
        SourceLocation(),
        PTI.ConstQualLoc,
        PTI.VolatileQualLoc,
        PTI.RestrictQualLoc,
        PTI.AtomicQualLoc,
        PTI.UnalignedQualLoc);
    return;
  }

  case DeclaratorChunk::Function:
  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::Array:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    // FIXME: We can't currently provide an accurate source location and a
    // fix-it hint for these.
    unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
    S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
                                RetTy.getCVRQualifiers() | AtomicQual,
                                D.getIdentifierLoc());
    return;
  }

  llvm_unreachable("unknown declarator chunk kind")::llvm::llvm_unreachable_internal("unknown declarator chunk kind"
, "clang/lib/Sema/SemaType.cpp", 3324);
}

// If the qualifiers come from a conversion function type, don't diagnose
// them -- they're not necessarily redundant, since such a conversion
// operator can be explicitly called as "x.operator const int()".
if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
  return;

// Just parens all the way out to the decl specifiers. Diagnose any qualifiers
// which are present there.
S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
                            D.getDeclSpec().getTypeQualifiers(),
                            D.getIdentifierLoc(),
                            D.getDeclSpec().getConstSpecLoc(),
                            D.getDeclSpec().getVolatileSpecLoc(),
                            D.getDeclSpec().getRestrictSpecLoc(),
                            D.getDeclSpec().getAtomicSpecLoc(),
                            D.getDeclSpec().getUnalignedSpecLoc());
3343}

3345static std::pair<QualType, TypeSourceInfo *>
3346InventTemplateParameter(TypeProcessingState &state, QualType T,
                      TypeSourceInfo *TrailingTSI, AutoType *Auto,
                      InventedTemplateParameterInfo &Info) {
Sema &S = state.getSema();
Declarator &D = state.getDeclarator();

const unsigned TemplateParameterDepth = Info.AutoTemplateParameterDepth;
const unsigned AutoParameterPosition = Info.TemplateParams.size();
const bool IsParameterPack = D.hasEllipsis();

// If auto is mentioned in a lambda parameter or abbreviated function
// template context, convert it to a template parameter type.

// Create the TemplateTypeParmDecl here to retrieve the corresponding
// template parameter type. Template parameters are temporarily added
// to the TU until the associated TemplateDecl is created.
TemplateTypeParmDecl *InventedTemplateParam =
    TemplateTypeParmDecl::Create(
        S.Context, S.Context.getTranslationUnitDecl(),
        /*KeyLoc=*/D.getDeclSpec().getTypeSpecTypeLoc(),
        /*NameLoc=*/D.getIdentifierLoc(),
        TemplateParameterDepth, AutoParameterPosition,
        S.InventAbbreviatedTemplateParameterTypeName(
            D.getIdentifier(), AutoParameterPosition), false,
        IsParameterPack, /*HasTypeConstraint=*/Auto->isConstrained());
InventedTemplateParam->setImplicit();
Info.TemplateParams.push_back(InventedTemplateParam);

// Attach type constraints to the new parameter.
if (Auto->isConstrained()) {
  if (TrailingTSI) {
    // The 'auto' appears in a trailing return type we've already built;
    // extract its type constraints to attach to the template parameter.
    AutoTypeLoc AutoLoc = TrailingTSI->getTypeLoc().getContainedAutoTypeLoc();
    TemplateArgumentListInfo TAL(AutoLoc.getLAngleLoc(), AutoLoc.getRAngleLoc());
    bool Invalid = false;
    for (unsigned Idx = 0; Idx < AutoLoc.getNumArgs(); ++Idx) {
      if (D.getEllipsisLoc().isInvalid() && !Invalid &&
          S.DiagnoseUnexpandedParameterPack(AutoLoc.getArgLoc(Idx),
                                            Sema::UPPC_TypeConstraint))
        Invalid = true;
      TAL.addArgument(AutoLoc.getArgLoc(Idx));
    }

    if (!Invalid) {
      S.AttachTypeConstraint(
          AutoLoc.getNestedNameSpecifierLoc(), AutoLoc.getConceptNameInfo(),
          AutoLoc.getNamedConcept(),
          AutoLoc.hasExplicitTemplateArgs() ? &TAL : nullptr,
          InventedTemplateParam, D.getEllipsisLoc());
    }
  } else {
    // The 'auto' appears in the decl-specifiers; we've not finished forming
    // TypeSourceInfo for it yet.
    TemplateIdAnnotation *TemplateId = D.getDeclSpec().getRepAsTemplateId();
    TemplateArgumentListInfo TemplateArgsInfo;
    bool Invalid = false;
    if (TemplateId->LAngleLoc.isValid()) {
      ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                         TemplateId->NumArgs);
      S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);

      if (D.getEllipsisLoc().isInvalid()) {
        for (TemplateArgumentLoc Arg : TemplateArgsInfo.arguments()) {
          if (S.DiagnoseUnexpandedParameterPack(Arg,
                                                Sema::UPPC_TypeConstraint)) {
            Invalid = true;
            break;
          }
        }
      }
    }
    if (!Invalid) {
      S.AttachTypeConstraint(
          D.getDeclSpec().getTypeSpecScope().getWithLocInContext(S.Context),
          DeclarationNameInfo(DeclarationName(TemplateId->Name),
                              TemplateId->TemplateNameLoc),
          cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl()),
          TemplateId->LAngleLoc.isValid() ? &TemplateArgsInfo : nullptr,
          InventedTemplateParam, D.getEllipsisLoc());
    }
  }
}

// Replace the 'auto' in the function parameter with this invented
// template type parameter.
// FIXME: Retain some type sugar to indicate that this was written
//  as 'auto'?
QualType Replacement(InventedTemplateParam->getTypeForDecl(), 0);
QualType NewT = state.ReplaceAutoType(T, Replacement);
TypeSourceInfo *NewTSI =
    TrailingTSI ? S.ReplaceAutoTypeSourceInfo(TrailingTSI, Replacement)
                : nullptr;
return {NewT, NewTSI};
3440}

3442static TypeSourceInfo *
3443GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
                             QualType T, TypeSourceInfo *ReturnTypeInfo);

3446static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
                                           TypeSourceInfo *&ReturnTypeInfo) {
Sema &SemaRef = state.getSema();
Declarator &D = state.getDeclarator();
QualType T;
ReturnTypeInfo = nullptr;

// The TagDecl owned by the DeclSpec.
TagDecl *OwnedTagDecl = nullptr;

switch (D.getName().getKind()) {
case UnqualifiedIdKind::IK_ImplicitSelfParam:
case UnqualifiedIdKind::IK_OperatorFunctionId:
case UnqualifiedIdKind::IK_Identifier:
case UnqualifiedIdKind::IK_LiteralOperatorId:
case UnqualifiedIdKind::IK_TemplateId:
  T = ConvertDeclSpecToType(state);

  if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
    OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
    // Owned declaration is embedded in declarator.
    OwnedTagDecl->setEmbeddedInDeclarator(true);
  }
  break;

case UnqualifiedIdKind::IK_ConstructorName:
case UnqualifiedIdKind::IK_ConstructorTemplateId:
case UnqualifiedIdKind::IK_DestructorName:
  // Constructors and destructors don't have return types. Use
  // "void" instead.
  T = SemaRef.Context.VoidTy;
  processTypeAttrs(state, T, TAL_DeclSpec,
                   D.getMutableDeclSpec().getAttributes());
  break;

case UnqualifiedIdKind::IK_DeductionGuideName:
  // Deduction guides have a trailing return type and no type in their
  // decl-specifier sequence. Use a placeholder return type for now.
  T = SemaRef.Context.DependentTy;
  break;

case UnqualifiedIdKind::IK_ConversionFunctionId:
  // The result type of a conversion function is the type that it
  // converts to.
  T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
                                &ReturnTypeInfo);
  break;
}

// Note: We don't need to distribute declaration attributes (i.e.
// D.getDeclarationAttributes()) because those are always C++11 attributes,
// and those don't get distributed.
distributeTypeAttrsFromDeclarator(state, T);

// Find the deduced type in this type. Look in the trailing return type if we
// have one, otherwise in the DeclSpec type.
// FIXME: The standard wording doesn't currently describe this.
DeducedType *Deduced = T->getContainedDeducedType();
bool DeducedIsTrailingReturnType = false;
if (Deduced && isa<AutoType>(Deduced) && D.hasTrailingReturnType()) {
  QualType T = SemaRef.GetTypeFromParser(D.getTrailingReturnType());
  Deduced = T.isNull() ? nullptr : T->getContainedDeducedType();
  DeducedIsTrailingReturnType = true;
}

// C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
if (Deduced) {
  AutoType *Auto = dyn_cast<AutoType>(Deduced);
  int Error = -1;

  // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
  // class template argument deduction)?
  bool IsCXXAutoType =
      (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
  bool IsDeducedReturnType = false;

  switch (D.getContext()) {
  case DeclaratorContext::LambdaExpr:
    // Declared return type of a lambda-declarator is implicit and is always
    // 'auto'.
    break;
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
    Error = 0;
    break;
  case DeclaratorContext::RequiresExpr:
    Error = 22;
    break;
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter: {
    InventedTemplateParameterInfo *Info = nullptr;
    if (D.getContext() == DeclaratorContext::Prototype) {
      // With concepts we allow 'auto' in function parameters.
      if (!SemaRef.getLangOpts().CPlusPlus20 || !Auto ||
          Auto->getKeyword() != AutoTypeKeyword::Auto) {
        Error = 0;
        break;
      } else if (!SemaRef.getCurScope()->isFunctionDeclarationScope()) {
        Error = 21;
        break;
      }

      Info = &SemaRef.InventedParameterInfos.back();
    } else {
      // In C++14, generic lambdas allow 'auto' in their parameters.
      if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto ||
          Auto->getKeyword() != AutoTypeKeyword::Auto) {
        Error = 16;
        break;
      }
      Info = SemaRef.getCurLambda();
      assert(Info && "No LambdaScopeInfo on the stack!")(static_cast <bool> (Info && "No LambdaScopeInfo on the stack!"
) ? void (0) : __assert_fail ("Info && \"No LambdaScopeInfo on the stack!\""
, "clang/lib/Sema/SemaType.cpp", 3557, __extension__ __PRETTY_FUNCTION__
));
    }

    // We'll deal with inventing template parameters for 'auto' in trailing
    // return types when we pick up the trailing return type when processing
    // the function chunk.
    if (!DeducedIsTrailingReturnType)
      T = InventTemplateParameter(state, T, nullptr, Auto, *Info).first;
    break;
  }
  case DeclaratorContext::Member: {
    if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
        D.isFunctionDeclarator())
      break;
    bool Cxx = SemaRef.getLangOpts().CPlusPlus;
    if (isa<ObjCContainerDecl>(SemaRef.CurContext)) {
      Error = 6; // Interface member.
    } else {
      switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
      case TTK_Enum: llvm_unreachable("unhandled tag kind")::llvm::llvm_unreachable_internal("unhandled tag kind", "clang/lib/Sema/SemaType.cpp"
, 3576);
      case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break;
      case TTK_Union:  Error = Cxx ? 3 : 4; /* Union member */ break;
      case TTK_Class:  Error = 5; /* Class member */ break;
      case TTK_Interface: Error = 6; /* Interface member */ break;
      }
    }
    if (D.getDeclSpec().isFriendSpecified())
      Error = 20; // Friend type
    break;
  }
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
    Error = 7; // Exception declaration
    break;
  case DeclaratorContext::TemplateParam:
    if (isa<DeducedTemplateSpecializationType>(Deduced) &&
        !SemaRef.getLangOpts().CPlusPlus20)
      Error = 19; // Template parameter (until C++20)
    else if (!SemaRef.getLangOpts().CPlusPlus17)
      Error = 8; // Template parameter (until C++17)
    break;
  case DeclaratorContext::BlockLiteral:
    Error = 9; // Block literal
    break;
  case DeclaratorContext::TemplateArg:
    // Within a template argument list, a deduced template specialization
    // type will be reinterpreted as a template template argument.
    if (isa<DeducedTemplateSpecializationType>(Deduced) &&
        !D.getNumTypeObjects() &&
        D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier)
      break;
    [[fallthrough]];
  case DeclaratorContext::TemplateTypeArg:
    Error = 10; // Template type argument
    break;
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
    Error = 12; // Type alias
    break;
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
    if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
      Error = 13; // Function return type
    IsDeducedReturnType = true;
    break;
  case DeclaratorContext::ConversionId:
    if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
      Error = 14; // conversion-type-id
    IsDeducedReturnType = true;
    break;
  case DeclaratorContext::FunctionalCast:
    if (isa<DeducedTemplateSpecializationType>(Deduced))
      break;
    if (SemaRef.getLangOpts().CPlusPlus2b && IsCXXAutoType &&
        !Auto->isDecltypeAuto())
      break; // auto(x)
    [[fallthrough]];
  case DeclaratorContext::TypeName:
  case DeclaratorContext::Association:
    Error = 15; // Generic
    break;
  case DeclaratorContext::File:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
    // FIXME: P0091R3 (erroneously) does not permit class template argument
    // deduction in conditions, for-init-statements, and other declarations
    // that are not simple-declarations.
    break;
  case DeclaratorContext::CXXNew:
    // FIXME: P0091R3 does not permit class template argument deduction here,
    // but we follow GCC and allow it anyway.
    if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
      Error = 17; // 'new' type
    break;
  case DeclaratorContext::KNRTypeList:
    Error = 18; // K&R function parameter
    break;
  }

  if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
    Error = 11;

  // In Objective-C it is an error to use 'auto' on a function declarator
  // (and everywhere for '__auto_type').
  if (D.isFunctionDeclarator() &&
      (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
    Error = 13;

  SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
  if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
    AutoRange = D.getName().getSourceRange();

  if (Error != -1) {
    unsigned Kind;
    if (Auto) {
      switch (Auto->getKeyword()) {
      case AutoTypeKeyword::Auto: Kind = 0; break;
      case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
      case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
      }
    } else {
      assert(isa<DeducedTemplateSpecializationType>(Deduced) &&(static_cast <bool> (isa<DeducedTemplateSpecializationType
>(Deduced) && "unknown auto type") ? void (0) : __assert_fail
 ("isa<DeducedTemplateSpecializationType>(Deduced) && \"unknown auto type\""
, "clang/lib/Sema/SemaType.cpp", 3681, __extension__ __PRETTY_FUNCTION__
))
             "unknown auto type")(static_cast <bool> (isa<DeducedTemplateSpecializationType
>(Deduced) && "unknown auto type") ? void (0) : __assert_fail
 ("isa<DeducedTemplateSpecializationType>(Deduced) && \"unknown auto type\""
, "clang/lib/Sema/SemaType.cpp", 3681, __extension__ __PRETTY_FUNCTION__
));
      Kind = 3;
    }

    auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
    TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();

    SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
      << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
      << QualType(Deduced, 0) << AutoRange;
    if (auto *TD = TN.getAsTemplateDecl())
      SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here);

    T = SemaRef.Context.IntTy;
    D.setInvalidType(true);
  } else if (Auto && D.getContext() != DeclaratorContext::LambdaExpr) {
    // If there was a trailing return type, we already got
    // warn_cxx98_compat_trailing_return_type in the parser.
    SemaRef.Diag(AutoRange.getBegin(),
                 D.getContext() == DeclaratorContext::LambdaExprParameter
                     ? diag::warn_cxx11_compat_generic_lambda
                 : IsDeducedReturnType
                     ? diag::warn_cxx11_compat_deduced_return_type
                     : diag::warn_cxx98_compat_auto_type_specifier)
        << AutoRange;
  }
}

if (SemaRef.getLangOpts().CPlusPlus &&
    OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
  // Check the contexts where C++ forbids the declaration of a new class
  // or enumeration in a type-specifier-seq.
  unsigned DiagID = 0;
  switch (D.getContext()) {
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
    // Class and enumeration definitions are syntactically not allowed in
    // trailing return types.
    llvm_unreachable("parser should not have allowed this")::llvm::llvm_unreachable_internal("parser should not have allowed this"
, "clang/lib/Sema/SemaType.cpp", 3719);
    break;
  case DeclaratorContext::File:
  case DeclaratorContext::Member:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
    // C++11 [dcl.type]p3:
    //   A type-specifier-seq shall not define a class or enumeration unless
    //   it appears in the type-id of an alias-declaration (7.1.3) that is not
    //   the declaration of a template-declaration.
  case DeclaratorContext::AliasDecl:
    break;
  case DeclaratorContext::AliasTemplate:
    DiagID = diag::err_type_defined_in_alias_template;
    break;
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::Association:
    DiagID = diag::err_type_defined_in_type_specifier;
    break;
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::RequiresExpr:
    // C++ [dcl.fct]p6:
    //   Types shall not be defined in return or parameter types.
    DiagID = diag::err_type_defined_in_param_type;
    break;
  case DeclaratorContext::Condition:
    // C++ 6.4p2:
    // The type-specifier-seq shall not contain typedef and shall not declare
    // a new class or enumeration.
    DiagID = diag::err_type_defined_in_condition;
    break;
  }

  if (DiagID != 0) {
    SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
        << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
    D.setInvalidType(true);
  }
}

assert(!T.isNull() && "This function should not return a null type")(static_cast <bool> (!T.isNull() && "This function should not return a null type"
) ? void (0) : __assert_fail ("!T.isNull() && \"This function should not return a null type\""
, "clang/lib/Sema/SemaType.cpp", 3774, __extension__ __PRETTY_FUNCTION__
));
return T;
3776}

3778/// Produce an appropriate diagnostic for an ambiguity between a function
3779/// declarator and a C++ direct-initializer.
3780static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
                                     DeclaratorChunk &DeclType, QualType RT) {
const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity")(static_cast <bool> (FTI.isAmbiguous && "no direct-initializer / function ambiguity"
) ? void (0) : __assert_fail ("FTI.isAmbiguous && \"no direct-initializer / function ambiguity\""
, "clang/lib/Sema/SemaType.cpp", 3783, __extension__ __PRETTY_FUNCTION__
));

// If the return type is void there is no ambiguity.
if (RT->isVoidType())
  return;

// An initializer for a non-class type can have at most one argument.
if (!RT->isRecordType() && FTI.NumParams > 1)
  return;

// An initializer for a reference must have exactly one argument.
if (RT->isReferenceType() && FTI.NumParams != 1)
  return;

// Only warn if this declarator is declaring a function at block scope, and
// doesn't have a storage class (such as 'extern') specified.
if (!D.isFunctionDeclarator() ||
    D.getFunctionDefinitionKind() != FunctionDefinitionKind::Declaration ||
    !S.CurContext->isFunctionOrMethod() ||
    D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_unspecified)
  return;

// Inside a condition, a direct initializer is not permitted. We allow one to
// be parsed in order to give better diagnostics in condition parsing.
if (D.getContext() == DeclaratorContext::Condition)
  return;

SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);

S.Diag(DeclType.Loc,
       FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
                     : diag::warn_empty_parens_are_function_decl)
    << ParenRange;

// If the declaration looks like:
//   T var1,
//   f();
// and name lookup finds a function named 'f', then the ',' was
// probably intended to be a ';'.
if (!D.isFirstDeclarator() && D.getIdentifier()) {
  FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
  FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
  if (Comma.getFileID() != Name.getFileID() ||
      Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
    LookupResult Result(S, D.getIdentifier(), SourceLocation(),
                        Sema::LookupOrdinaryName);
    if (S.LookupName(Result, S.getCurScope()))
      S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
        << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
        << D.getIdentifier();
    Result.suppressDiagnostics();
  }
}

if (FTI.NumParams > 0) {
  // For a declaration with parameters, eg. "T var(T());", suggest adding
  // parens around the first parameter to turn the declaration into a
  // variable declaration.
  SourceRange Range = FTI.Params[0].Param->getSourceRange();
  SourceLocation B = Range.getBegin();
  SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
  // FIXME: Maybe we should suggest adding braces instead of parens
  // in C++11 for classes that don't have an initializer_list constructor.
  S.Diag(B, diag::note_additional_parens_for_variable_declaration)
    << FixItHint::CreateInsertion(B, "(")
    << FixItHint::CreateInsertion(E, ")");
} else {
  // For a declaration without parameters, eg. "T var();", suggest replacing
  // the parens with an initializer to turn the declaration into a variable
  // declaration.
  const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();

  // Empty parens mean value-initialization, and no parens mean
  // default initialization. These are equivalent if the default
  // constructor is user-provided or if zero-initialization is a
  // no-op.
  if (RD && RD->hasDefinition() &&
      (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
    S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
      << FixItHint::CreateRemoval(ParenRange);
  else {
    std::string Init =
        S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
    if (Init.empty() && S.LangOpts.CPlusPlus11)
      Init = "{}";
    if (!Init.empty())
      S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
        << FixItHint::CreateReplacement(ParenRange, Init);
  }
}
3873}

3875/// Produce an appropriate diagnostic for a declarator with top-level
3876/// parentheses.
3877static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) {
DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1);
assert(Paren.Kind == DeclaratorChunk::Paren &&(static_cast <bool> (Paren.Kind == DeclaratorChunk::Paren
 && "do not have redundant top-level parentheses") ? void
 (0) : __assert_fail ("Paren.Kind == DeclaratorChunk::Paren && \"do not have redundant top-level parentheses\""
, "clang/lib/Sema/SemaType.cpp", 3880, __extension__ __PRETTY_FUNCTION__
))
       "do not have redundant top-level parentheses")(static_cast <bool> (Paren.Kind == DeclaratorChunk::Paren
 && "do not have redundant top-level parentheses") ? void
 (0) : __assert_fail ("Paren.Kind == DeclaratorChunk::Paren && \"do not have redundant top-level parentheses\""
, "clang/lib/Sema/SemaType.cpp", 3880, __extension__ __PRETTY_FUNCTION__
));

// This is a syntactic check; we're not interested in cases that arise
// during template instantiation.
if (S.inTemplateInstantiation())
  return;

// Check whether this could be intended to be a construction of a temporary
// object in C++ via a function-style cast.
bool CouldBeTemporaryObject =
    S.getLangOpts().CPlusPlus && D.isExpressionContext() &&
    !D.isInvalidType() && D.getIdentifier() &&
    D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier &&
    (T->isRecordType() || T->isDependentType()) &&
    D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator();

bool StartsWithDeclaratorId = true;
for (auto &C : D.type_objects()) {
  switch (C.Kind) {
  case DeclaratorChunk::Paren:
    if (&C == &Paren)
      continue;
    [[fallthrough]];
  case DeclaratorChunk::Pointer:
    StartsWithDeclaratorId = false;
    continue;

  case DeclaratorChunk::Array:
    if (!C.Arr.NumElts)
      CouldBeTemporaryObject = false;
    continue;

  case DeclaratorChunk::Reference:
    // FIXME: Suppress the warning here if there is no initializer; we're
    // going to give an error anyway.
    // We assume that something like 'T (&x) = y;' is highly likely to not
    // be intended to be a temporary object.
    CouldBeTemporaryObject = false;
    StartsWithDeclaratorId = false;
    continue;

  case DeclaratorChunk::Function:
    // In a new-type-id, function chunks require parentheses.
    if (D.getContext() == DeclaratorContext::CXXNew)
      return;
    // FIXME: "A(f())" deserves a vexing-parse warning, not just a
    // redundant-parens warning, but we don't know whether the function
    // chunk was syntactically valid as an expression here.
    CouldBeTemporaryObject = false;
    continue;

  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    // These cannot appear in expressions.
    CouldBeTemporaryObject = false;
    StartsWithDeclaratorId = false;
    continue;
  }
}

// FIXME: If there is an initializer, assume that this is not intended to be
// a construction of a temporary object.

// Check whether the name has already been declared; if not, this is not a
// function-style cast.
if (CouldBeTemporaryObject) {
  LookupResult Result(S, D.getIdentifier(), SourceLocation(),
                      Sema::LookupOrdinaryName);
  if (!S.LookupName(Result, S.getCurScope()))
    CouldBeTemporaryObject = false;
  Result.suppressDiagnostics();
}

SourceRange ParenRange(Paren.Loc, Paren.EndLoc);

if (!CouldBeTemporaryObject) {
  // If we have A (::B), the parentheses affect the meaning of the program.
  // Suppress the warning in that case. Don't bother looking at the DeclSpec
  // here: even (e.g.) "int ::x" is visually ambiguous even though it's
  // formally unambiguous.
  if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) {
    for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS;
         NNS = NNS->getPrefix()) {
      if (NNS->getKind() == NestedNameSpecifier::Global)
        return;
    }
  }

  S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator)
      << ParenRange << FixItHint::CreateRemoval(Paren.Loc)
      << FixItHint::CreateRemoval(Paren.EndLoc);
  return;
}

S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration)
    << ParenRange << D.getIdentifier();
auto *RD = T->getAsCXXRecordDecl();
if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor())
  S.Diag(Paren.Loc, diag::note_raii_guard_add_name)
      << FixItHint::CreateInsertion(Paren.Loc, " varname") << T
      << D.getIdentifier();
// FIXME: A cast to void is probably a better suggestion in cases where it's
// valid (when there is no initializer and we're not in a condition).
S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses)
    << FixItHint::CreateInsertion(D.getBeginLoc(), "(")
    << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")");
S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration)
    << FixItHint::CreateRemoval(Paren.Loc)
    << FixItHint::CreateRemoval(Paren.EndLoc);
3990}

3992/// Helper for figuring out the default CC for a function declarator type.  If
3993/// this is the outermost chunk, then we can determine the CC from the
3994/// declarator context.  If not, then this could be either a member function
3995/// type or normal function type.
3996static CallingConv getCCForDeclaratorChunk(
  Sema &S, Declarator &D, const ParsedAttributesView &AttrList,
  const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) {
assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function)(static_cast <bool> (D.getTypeObject(ChunkIndex).Kind ==
 DeclaratorChunk::Function) ? void (0) : __assert_fail ("D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function"
, "clang/lib/Sema/SemaType.cpp", 3999, __extension__ __PRETTY_FUNCTION__
));

// Check for an explicit CC attribute.
for (const ParsedAttr &AL : AttrList) {
  switch (AL.getKind()) {
  CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
 ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_SwiftAsyncCall: case ParsedAttr::AT_VectorCall
: case ParsedAttr::AT_AArch64VectorPcs: case ParsedAttr::AT_AArch64SVEPcs
: case ParsedAttr::AT_AMDGPUKernelCall: case ParsedAttr::AT_MSABI
: case ParsedAttr::AT_SysVABI: case ParsedAttr::AT_Pcs: case ParsedAttr
::AT_IntelOclBicc: case ParsedAttr::AT_PreserveMost: case ParsedAttr
::AT_PreserveAll : {
    // Ignore attributes that don't validate or can't apply to the
    // function type.  We'll diagnose the failure to apply them in
    // handleFunctionTypeAttr.
    CallingConv CC;
    if (!S.CheckCallingConvAttr(AL, CC) &&
        (!FTI.isVariadic || supportsVariadicCall(CC))) {
      return CC;
    }
    break;
  }

  default:
    break;
  }
}

bool IsCXXInstanceMethod = false;

if (S.getLangOpts().CPlusPlus) {
  // Look inwards through parentheses to see if this chunk will form a
  // member pointer type or if we're the declarator.  Any type attributes
  // between here and there will override the CC we choose here.
  unsigned I = ChunkIndex;
  bool FoundNonParen = false;
  while (I && !FoundNonParen) {
    --I;
    if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
      FoundNonParen = true;
  }

  if (FoundNonParen) {
    // If we're not the declarator, we're a regular function type unless we're
    // in a member pointer.
    IsCXXInstanceMethod =
        D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
  } else if (D.getContext() == DeclaratorContext::LambdaExpr) {
    // This can only be a call operator for a lambda, which is an instance
    // method.
    IsCXXInstanceMethod = true;
  } else {
    // We're the innermost decl chunk, so must be a function declarator.
    assert(D.isFunctionDeclarator())(static_cast <bool> (D.isFunctionDeclarator()) ? void (
0) : __assert_fail ("D.isFunctionDeclarator()", "clang/lib/Sema/SemaType.cpp"
, 4046, __extension__ __PRETTY_FUNCTION__));

    // If we're inside a record, we're declaring a method, but it could be
    // explicitly or implicitly static.
    IsCXXInstanceMethod =
        D.isFirstDeclarationOfMember() &&
        D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
        !D.isStaticMember();
  }
}

CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
                                                       IsCXXInstanceMethod);

// Attribute AT_OpenCLKernel affects the calling convention for SPIR
// and AMDGPU targets, hence it cannot be treated as a calling
// convention attribute. This is the simplest place to infer
// calling convention for OpenCL kernels.
if (S.getLangOpts().OpenCL) {
  for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
    if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) {
      CC = CC_OpenCLKernel;
      break;
    }
  }
} else if (S.getLangOpts().CUDA) {
  // If we're compiling CUDA/HIP code and targeting SPIR-V we need to make
  // sure the kernels will be marked with the right calling convention so that
  // they will be visible by the APIs that ingest SPIR-V.
  llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
  if (Triple.getArch() == llvm::Triple::spirv32 ||
      Triple.getArch() == llvm::Triple::spirv64) {
    for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
      if (AL.getKind() == ParsedAttr::AT_CUDAGlobal) {
        CC = CC_OpenCLKernel;
        break;
      }
    }
  }
}

return CC;
4088}

4090namespace {
/// A simple notion of pointer kinds, which matches up with the various
/// pointer declarators.
enum class SimplePointerKind {
  Pointer,
  BlockPointer,
  MemberPointer,
  Array,
};
4099} // end anonymous namespace

4101IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
switch (nullability) {
case NullabilityKind::NonNull:
  if (!Ident__Nonnull)
    Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
  return Ident__Nonnull;

case NullabilityKind::Nullable:
  if (!Ident__Nullable)
    Ident__Nullable = PP.getIdentifierInfo("_Nullable");
  return Ident__Nullable;

case NullabilityKind::NullableResult:
  if (!Ident__Nullable_result)
    Ident__Nullable_result = PP.getIdentifierInfo("_Nullable_result");
  return Ident__Nullable_result;

case NullabilityKind::Unspecified:
  if (!Ident__Null_unspecified)
    Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
  return Ident__Null_unspecified;
}
llvm_unreachable("Unknown nullability kind.")::llvm::llvm_unreachable_internal("Unknown nullability kind."
, "clang/lib/Sema/SemaType.cpp", 4123);
4124}

4126/// Retrieve the identifier "NSError".
4127IdentifierInfo *Sema::getNSErrorIdent() {
if (!Ident_NSError)
  Ident_NSError = PP.getIdentifierInfo("NSError");

return Ident_NSError;
4132}

4134/// Check whether there is a nullability attribute of any kind in the given
4135/// attribute list.
4136static bool hasNullabilityAttr(const ParsedAttributesView &attrs) {
for (const ParsedAttr &AL : attrs) {
  if (AL.getKind() == ParsedAttr::AT_TypeNonNull ||
      AL.getKind() == ParsedAttr::AT_TypeNullable ||
      AL.getKind() == ParsedAttr::AT_TypeNullableResult ||
      AL.getKind() == ParsedAttr::AT_TypeNullUnspecified)
    return true;
}

return false;
4146}

4148namespace {
/// Describes the kind of a pointer a declarator describes.
enum class PointerDeclaratorKind {
  // Not a pointer.
  NonPointer,
  // Single-level pointer.
  SingleLevelPointer,
  // Multi-level pointer (of any pointer kind).
  MultiLevelPointer,
  // CFFooRef*
  MaybePointerToCFRef,
  // CFErrorRef*
  CFErrorRefPointer,
  // NSError**
  NSErrorPointerPointer,
};

/// Describes a declarator chunk wrapping a pointer that marks inference as
/// unexpected.
// These values must be kept in sync with diagnostics.
enum class PointerWrappingDeclaratorKind {
  /// Pointer is top-level.
  None = -1,
  /// Pointer is an array element.
  Array = 0,
  /// Pointer is the referent type of a C++ reference.
  Reference = 1
};
4176} // end anonymous namespace

4178/// Classify the given declarator, whose type-specified is \c type, based on
4179/// what kind of pointer it refers to.
4180///
4181/// This is used to determine the default nullability.
4182static PointerDeclaratorKind
4183classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
                        PointerWrappingDeclaratorKind &wrappingKind) {
unsigned numNormalPointers = 0;

// For any dependent type, we consider it a non-pointer.
if (type->isDependentType())
  return PointerDeclaratorKind::NonPointer;

// Look through the declarator chunks to identify pointers.
for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i);
  switch (chunk.Kind) {
  case DeclaratorChunk::Array:
    if (numNormalPointers == 0)
      wrappingKind = PointerWrappingDeclaratorKind::Array;
    break;

  case DeclaratorChunk::Function:
  case DeclaratorChunk::Pipe:
    break;

  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::MemberPointer:
    return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
                                 : PointerDeclaratorKind::SingleLevelPointer;

  case DeclaratorChunk::Paren:
    break;

  case DeclaratorChunk::Reference:
    if (numNormalPointers == 0)
      wrappingKind = PointerWrappingDeclaratorKind::Reference;
    break;

  case DeclaratorChunk::Pointer:
    ++numNormalPointers;
    if (numNormalPointers > 2)
      return PointerDeclaratorKind::MultiLevelPointer;
    break;
  }
}

// Then, dig into the type specifier itself.
unsigned numTypeSpecifierPointers = 0;
do {
  // Decompose normal pointers.
  if (auto ptrType = type->getAs<PointerType>()) {
    ++numNormalPointers;

    if (numNormalPointers > 2)
      return PointerDeclaratorKind::MultiLevelPointer;

    type = ptrType->getPointeeType();
    ++numTypeSpecifierPointers;
    continue;
  }

  // Decompose block pointers.
  if (type->getAs<BlockPointerType>()) {
    return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
                                 : PointerDeclaratorKind::SingleLevelPointer;
  }

  // Decompose member pointers.
  if (type->getAs<MemberPointerType>()) {
    return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
                                 : PointerDeclaratorKind::SingleLevelPointer;
  }

  // Look at Objective-C object pointers.
  if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
    ++numNormalPointers;
    ++numTypeSpecifierPointers;

    // If this is NSError**, report that.
    if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
      if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
          numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
        return PointerDeclaratorKind::NSErrorPointerPointer;
      }
    }

    break;
  }

  // Look at Objective-C class types.
  if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
    if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
      if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
        return PointerDeclaratorKind::NSErrorPointerPointer;
    }

    break;
  }

  // If at this point we haven't seen a pointer, we won't see one.
  if (numNormalPointers == 0)
    return PointerDeclaratorKind::NonPointer;

  if (auto recordType = type->getAs<RecordType>()) {
    RecordDecl *recordDecl = recordType->getDecl();

    // If this is CFErrorRef*, report it as such.
    if (numNormalPointers == 2 && numTypeSpecifierPointers < 2 &&
        S.isCFError(recordDecl)) {
      return PointerDeclaratorKind::CFErrorRefPointer;
    }
    break;
  }

  break;
} while (true);

switch (numNormalPointers) {
case 0:
  return PointerDeclaratorKind::NonPointer;

case 1:
  return PointerDeclaratorKind::SingleLevelPointer;

case 2:
  return PointerDeclaratorKind::MaybePointerToCFRef;

default:
  return PointerDeclaratorKind::MultiLevelPointer;
}
4309}

4311bool Sema::isCFError(RecordDecl *RD) {
// If we already know about CFError, test it directly.
if (CFError)
  return CFError == RD;

// Check whether this is CFError, which we identify based on its bridge to
// NSError. CFErrorRef used to be declared with "objc_bridge" but is now
// declared with "objc_bridge_mutable", so look for either one of the two
// attributes.
if (RD->getTagKind() == TTK_Struct) {
  IdentifierInfo *bridgedType = nullptr;
  if (auto bridgeAttr = RD->getAttr<ObjCBridgeAttr>())
    bridgedType = bridgeAttr->getBridgedType();
  else if (auto bridgeAttr = RD->getAttr<ObjCBridgeMutableAttr>())
    bridgedType = bridgeAttr->getBridgedType();

  if (bridgedType == getNSErrorIdent()) {
    CFError = RD;
    return true;
  }
}

return false;
4334}

4336static FileID getNullabilityCompletenessCheckFileID(Sema &S,
                                                  SourceLocation loc) {
// If we're anywhere in a function, method, or closure context, don't perform
// completeness checks.
for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
  if (ctx->isFunctionOrMethod())
    return FileID();

  if (ctx->isFileContext())
    break;
}

// We only care about the expansion location.
loc = S.SourceMgr.getExpansionLoc(loc);
FileID file = S.SourceMgr.getFileID(loc);
if (file.isInvalid())
  return FileID();

// Retrieve file information.
bool invalid = false;
const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
if (invalid || !sloc.isFile())
  return FileID();

// We don't want to perform completeness checks on the main file or in
// system headers.
const SrcMgr::FileInfo &fileInfo = sloc.getFile();
if (fileInfo.getIncludeLoc().isInvalid())
  return FileID();
if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
    S.Diags.getSuppressSystemWarnings()) {
  return FileID();
}

return file;
4371}

4373/// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
4374/// taking into account whitespace before and after.
4375template <typename DiagBuilderT>
4376static void fixItNullability(Sema &S, DiagBuilderT &Diag,
                           SourceLocation PointerLoc,
                           NullabilityKind Nullability) {
assert(PointerLoc.isValid())(static_cast <bool> (PointerLoc.isValid()) ? void (0) :
 __assert_fail ("PointerLoc.isValid()", "clang/lib/Sema/SemaType.cpp"
, 4379, __extension__ __PRETTY_FUNCTION__));
if (PointerLoc.isMacroID())
  return;

SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
  return;

const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
if (!NextChar)
  return;

SmallString<32> InsertionTextBuf{" "};
InsertionTextBuf += getNullabilitySpelling(Nullability);
InsertionTextBuf += " ";
StringRef InsertionText = InsertionTextBuf.str();

if (isWhitespace(*NextChar)) {
  InsertionText = InsertionText.drop_back();
} else if (NextChar[-1] == '[') {
  if (NextChar[0] == ']')
    InsertionText = InsertionText.drop_back().drop_front();
  else
    InsertionText = InsertionText.drop_front();
} else if (!isAsciiIdentifierContinue(NextChar[0], /*allow dollar*/ true) &&
           !isAsciiIdentifierContinue(NextChar[-1], /*allow dollar*/ true)) {
  InsertionText = InsertionText.drop_back().drop_front();
}

Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
4409}

4411static void emitNullabilityConsistencyWarning(Sema &S,
                                            SimplePointerKind PointerKind,
                                            SourceLocation PointerLoc,
                                            SourceLocation PointerEndLoc) {
assert(PointerLoc.isValid())(static_cast <bool> (PointerLoc.isValid()) ? void (0) :
 __assert_fail ("PointerLoc.isValid()", "clang/lib/Sema/SemaType.cpp"
, 4415, __extension__ __PRETTY_FUNCTION__));

if (PointerKind == SimplePointerKind::Array) {
  S.Diag(PointerLoc, diag::warn_nullability_missing_array);
} else {
  S.Diag(PointerLoc, diag::warn_nullability_missing)
    << static_cast<unsigned>(PointerKind);
}

auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc;
if (FixItLoc.isMacroID())
  return;

auto addFixIt = [&](NullabilityKind Nullability) {
  auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it);
  Diag << static_cast<unsigned>(Nullability);
  Diag << static_cast<unsigned>(PointerKind);
  fixItNullability(S, Diag, FixItLoc, Nullability);
};
addFixIt(NullabilityKind::Nullable);
addFixIt(NullabilityKind::NonNull);
4436}

4438/// Complains about missing nullability if the file containing \p pointerLoc
4439/// has other uses of nullability (either the keywords or the \c assume_nonnull
4440/// pragma).
4441///
4442/// If the file has \e not seen other uses of nullability, this particular
4443/// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
4444static void
4445checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind,
                          SourceLocation pointerLoc,
                          SourceLocation pointerEndLoc = SourceLocation()) {
// Determine which file we're performing consistency checking for.
FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
if (file.isInvalid())
  return;

// If we haven't seen any type nullability in this file, we won't warn now
// about anything.
FileNullability &fileNullability = S.NullabilityMap[file];
if (!fileNullability.SawTypeNullability) {
  // If this is the first pointer declarator in the file, and the appropriate
  // warning is on, record it in case we need to diagnose it retroactively.
  diag::kind diagKind;
  if (pointerKind == SimplePointerKind::Array)
    diagKind = diag::warn_nullability_missing_array;
  else
    diagKind = diag::warn_nullability_missing;

  if (fileNullability.PointerLoc.isInvalid() &&
      !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
    fileNullability.PointerLoc = pointerLoc;
    fileNullability.PointerEndLoc = pointerEndLoc;
    fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
  }

  return;
}

// Complain about missing nullability.
emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc);
4477}

4479/// Marks that a nullability feature has been used in the file containing
4480/// \p loc.
4481///
4482/// If this file already had pointer types in it that were missing nullability,
4483/// the first such instance is retroactively diagnosed.
4484///
4485/// \sa checkNullabilityConsistency
4486static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
FileID file = getNullabilityCompletenessCheckFileID(S, loc);
if (file.isInvalid())
  return;

FileNullability &fileNullability = S.NullabilityMap[file];
if (fileNullability.SawTypeNullability)
  return;
fileNullability.SawTypeNullability = true;

// If we haven't seen any type nullability before, now we have. Retroactively
// diagnose the first unannotated pointer, if there was one.
if (fileNullability.PointerLoc.isInvalid())
  return;

auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc,
                                  fileNullability.PointerEndLoc);
4504}

4506/// Returns true if any of the declarator chunks before \p endIndex include a
4507/// level of indirection: array, pointer, reference, or pointer-to-member.
4508///
4509/// Because declarator chunks are stored in outer-to-inner order, testing
4510/// every chunk before \p endIndex is testing all chunks that embed the current
4511/// chunk as part of their type.
4512///
4513/// It is legal to pass the result of Declarator::getNumTypeObjects() as the
4514/// end index, in which case all chunks are tested.
4515static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
unsigned i = endIndex;
while (i != 0) {
  // Walk outwards along the declarator chunks.
  --i;
  const DeclaratorChunk &DC = D.getTypeObject(i);
  switch (DC.Kind) {
  case DeclaratorChunk::Paren:
    break;
  case DeclaratorChunk::Array:
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::MemberPointer:
    return true;
  case DeclaratorChunk::Function:
  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::Pipe:
    // These are invalid anyway, so just ignore.
    break;
  }
}
return false;
4537}

4539static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
return (Chunk.Kind == DeclaratorChunk::Pointer ||
        Chunk.Kind == DeclaratorChunk::Array);
4542}

4544template<typename AttrT>
4545static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
AL.setUsedAsTypeAttr();
return ::new (Ctx) AttrT(Ctx, AL);
4548}

4550static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
                                 NullabilityKind NK) {
switch (NK) {
case NullabilityKind::NonNull:
  return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);

case NullabilityKind::Nullable:
  return createSimpleAttr<TypeNullableAttr>(Ctx, Attr);

case NullabilityKind::NullableResult:
  return createSimpleAttr<TypeNullableResultAttr>(Ctx, Attr);

case NullabilityKind::Unspecified:
  return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr);
}
llvm_unreachable("unknown NullabilityKind")::llvm::llvm_unreachable_internal("unknown NullabilityKind", "clang/lib/Sema/SemaType.cpp"
, 4565);
4566}

4568// Diagnose whether this is a case with the multiple addr spaces.
4569// Returns true if this is an invalid case.
4570// ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4571// by qualifiers for two or more different address spaces."
4572static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld,
                                              LangAS ASNew,
                                              SourceLocation AttrLoc) {
if (ASOld != LangAS::Default) {
  if (ASOld != ASNew) {
    S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
    return true;
  }
  // Emit a warning if they are identical; it's likely unintended.
  S.Diag(AttrLoc,
         diag::warn_attribute_address_multiple_identical_qualifiers);
}
return false;
4585}

4587static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
                                              QualType declSpecType,
                                              TypeSourceInfo *TInfo) {
// The TypeSourceInfo that this function returns will not be a null type.
// If there is an error, this function will fill in a dummy type as fallback.
QualType T = declSpecType;
Declarator &D = state.getDeclarator();
Sema &S = state.getSema();
ASTContext &Context = S.Context;
const LangOptions &LangOpts = S.getLangOpts();

// The name we're declaring, if any.
DeclarationName Name;
if (D.getIdentifier())
  Name = D.getIdentifier();

// Does this declaration declare a typedef-name?
bool IsTypedefName =
    D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
    D.getContext() == DeclaratorContext::AliasDecl ||
    D.getContext() == DeclaratorContext::AliasTemplate;

// Does T refer to a function type with a cv-qualifier or a ref-qualifier?
bool IsQualifiedFunction = T->isFunctionProtoType() &&
    (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() ||
     T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);

// If T is 'decltype(auto)', the only declarators we can have are parens
// and at most one function declarator if this is a function declaration.
// If T is a deduced class template specialization type, we can have no
// declarator chunks at all.
if (auto *DT = T->getAs<DeducedType>()) {
  const AutoType *AT = T->getAs<AutoType>();
  bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
  if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
    for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
      unsigned Index = E - I - 1;
      DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
      unsigned DiagId = IsClassTemplateDeduction
                            ? diag::err_deduced_class_template_compound_type
                            : diag::err_decltype_auto_compound_type;
      unsigned DiagKind = 0;
      switch (DeclChunk.Kind) {
      case DeclaratorChunk::Paren:
        // FIXME: Rejecting this is a little silly.
        if (IsClassTemplateDeduction) {
          DiagKind = 4;
          break;
        }
        continue;
      case DeclaratorChunk::Function: {
        if (IsClassTemplateDeduction) {
          DiagKind = 3;
          break;
        }
        unsigned FnIndex;
        if (D.isFunctionDeclarationContext() &&
            D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
          continue;
        DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
        break;
      }
      case DeclaratorChunk::Pointer:
      case DeclaratorChunk::BlockPointer:
      case DeclaratorChunk::MemberPointer:
        DiagKind = 0;
        break;
      case DeclaratorChunk::Reference:
        DiagKind = 1;
        break;
      case DeclaratorChunk::Array:
        DiagKind = 2;
        break;
      case DeclaratorChunk::Pipe:
        break;
      }

      S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
      D.setInvalidType(true);
      break;
    }
  }
}

// Determine whether we should infer _Nonnull on pointer types.
Optional<NullabilityKind> inferNullability;
bool inferNullabilityCS = false;
bool inferNullabilityInnerOnly = false;
bool inferNullabilityInnerOnlyComplete = false;

// Are we in an assume-nonnull region?
bool inAssumeNonNullRegion = false;
SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
if (assumeNonNullLoc.isValid()) {
  inAssumeNonNullRegion = true;
  recordNullabilitySeen(S, assumeNonNullLoc);
}

// Whether to complain about missing nullability specifiers or not.
enum {
  /// Never complain.
  CAMN_No,
  /// Complain on the inner pointers (but not the outermost
  /// pointer).
  CAMN_InnerPointers,
  /// Complain about any pointers that don't have nullability
  /// specified or inferred.
  CAMN_Yes
} complainAboutMissingNullability = CAMN_No;
unsigned NumPointersRemaining = 0;
auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;

if (IsTypedefName) {
  // For typedefs, we do not infer any nullability (the default),
  // and we only complain about missing nullability specifiers on
  // inner pointers.
  complainAboutMissingNullability = CAMN_InnerPointers;

  if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
      !T->getNullability(S.Context)) {
    // Note that we allow but don't require nullability on dependent types.
    ++NumPointersRemaining;
  }

  for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
    DeclaratorChunk &chunk = D.getTypeObject(i);
    switch (chunk.Kind) {
    case DeclaratorChunk::Array:
    case DeclaratorChunk::Function:
    case DeclaratorChunk::Pipe:
      break;

    case DeclaratorChunk::BlockPointer:
    case DeclaratorChunk::MemberPointer:
      ++NumPointersRemaining;
      break;

    case DeclaratorChunk::Paren:
    case DeclaratorChunk::Reference:
      continue;

    case DeclaratorChunk::Pointer:
      ++NumPointersRemaining;
      continue;
    }
  }
} else {
  bool isFunctionOrMethod = false;
  switch (auto context = state.getDeclarator().getContext()) {
  case DeclaratorContext::ObjCParameter:
  case DeclaratorContext::ObjCResult:
  case DeclaratorContext::Prototype:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
    isFunctionOrMethod = true;
    [[fallthrough]];

  case DeclaratorContext::Member:
    if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
      complainAboutMissingNullability = CAMN_No;
      break;
    }

    // Weak properties are inferred to be nullable.
    if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) {
      inferNullability = NullabilityKind::Nullable;
      break;
    }

    [[fallthrough]];

  case DeclaratorContext::File:
  case DeclaratorContext::KNRTypeList: {
    complainAboutMissingNullability = CAMN_Yes;

    // Nullability inference depends on the type and declarator.
    auto wrappingKind = PointerWrappingDeclaratorKind::None;
    switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
    case PointerDeclaratorKind::NonPointer:
    case PointerDeclaratorKind::MultiLevelPointer:
      // Cannot infer nullability.
      break;

    case PointerDeclaratorKind::SingleLevelPointer:
      // Infer _Nonnull if we are in an assumes-nonnull region.
      if (inAssumeNonNullRegion) {
        complainAboutInferringWithinChunk = wrappingKind;
        inferNullability = NullabilityKind::NonNull;
        inferNullabilityCS = (context == DeclaratorContext::ObjCParameter ||
                              context == DeclaratorContext::ObjCResult);
      }
      break;

    case PointerDeclaratorKind::CFErrorRefPointer:
    case PointerDeclaratorKind::NSErrorPointerPointer:
      // Within a function or method signature, infer _Nullable at both
      // levels.
      if (isFunctionOrMethod && inAssumeNonNullRegion)
        inferNullability = NullabilityKind::Nullable;
      break;

    case PointerDeclaratorKind::MaybePointerToCFRef:
      if (isFunctionOrMethod) {
        // On pointer-to-pointer parameters marked cf_returns_retained or
        // cf_returns_not_retained, if the outer pointer is explicit then
        // infer the inner pointer as _Nullable.
        auto hasCFReturnsAttr =
            [](const ParsedAttributesView &AttrList) -> bool {
          return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) ||
                 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained);
        };
        if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
          if (hasCFReturnsAttr(D.getDeclarationAttributes()) ||
              hasCFReturnsAttr(D.getAttributes()) ||
              hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
              hasCFReturnsAttr(D.getDeclSpec().getAttributes())) {
            inferNullability = NullabilityKind::Nullable;
            inferNullabilityInnerOnly = true;
          }
        }
      }
      break;
    }
    break;
  }

  case DeclaratorContext::ConversionId:
    complainAboutMissingNullability = CAMN_Yes;
    break;

  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::Block:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::Condition:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::TemplateParam:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::RequiresExpr:
  case DeclaratorContext::Association:
    // Don't infer in these contexts.
    break;
  }
}

// Local function that returns true if its argument looks like a va_list.
auto isVaList = [&S](QualType T) -> bool {
  auto *typedefTy = T->getAs<TypedefType>();
  if (!typedefTy)
    return false;
  TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
  do {
    if (typedefTy->getDecl() == vaListTypedef)
      return true;
    if (auto *name = typedefTy->getDecl()->getIdentifier())
      if (name->isStr("va_list"))
        return true;
    typedefTy = typedefTy->desugar()->getAs<TypedefType>();
  } while (typedefTy);
  return false;
};

// Local function that checks the nullability for a given pointer declarator.
// Returns true if _Nonnull was inferred.
auto inferPointerNullability =
    [&](SimplePointerKind pointerKind, SourceLocation pointerLoc,
        SourceLocation pointerEndLoc,
        ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * {
  // We've seen a pointer.
  if (NumPointersRemaining > 0)
    --NumPointersRemaining;

  // If a nullability attribute is present, there's nothing to do.
  if (hasNullabilityAttr(attrs))
    return nullptr;

  // If we're supposed to infer nullability, do so now.
  if (inferNullability && !inferNullabilityInnerOnlyComplete) {
    ParsedAttr::Syntax syntax = inferNullabilityCS
                                    ? ParsedAttr::AS_ContextSensitiveKeyword
                                    : ParsedAttr::AS_Keyword;
    ParsedAttr *nullabilityAttr = Pool.create(
        S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
        nullptr, SourceLocation(), nullptr, 0, syntax);

    attrs.addAtEnd(nullabilityAttr);

    if (inferNullabilityCS) {
      state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
        ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
    }

    if (pointerLoc.isValid() &&
        complainAboutInferringWithinChunk !=
          PointerWrappingDeclaratorKind::None) {
      auto Diag =
          S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
      Diag << static_cast<int>(complainAboutInferringWithinChunk);
      fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
    }

    if (inferNullabilityInnerOnly)
      inferNullabilityInnerOnlyComplete = true;
    return nullabilityAttr;
  }

  // If we're supposed to complain about missing nullability, do so
  // now if it's truly missing.
  switch (complainAboutMissingNullability) {
  case CAMN_No:
    break;

  case CAMN_InnerPointers:
    if (NumPointersRemaining == 0)
      break;
    [[fallthrough]];

  case CAMN_Yes:
    checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc);
  }
  return nullptr;
};

// If the type itself could have nullability but does not, infer pointer
// nullability and perform consistency checking.
if (S.CodeSynthesisContexts.empty()) {
  if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
      !T->getNullability(S.Context)) {
    if (isVaList(T)) {
      // Record that we've seen a pointer, but do nothing else.
      if (NumPointersRemaining > 0)
        --NumPointersRemaining;
    } else {
      SimplePointerKind pointerKind = SimplePointerKind::Pointer;
      if (T->isBlockPointerType())
        pointerKind = SimplePointerKind::BlockPointer;
      else if (T->isMemberPointerType())
        pointerKind = SimplePointerKind::MemberPointer;

      if (auto *attr = inferPointerNullability(
              pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
              D.getDeclSpec().getEndLoc(),
              D.getMutableDeclSpec().getAttributes(),
              D.getMutableDeclSpec().getAttributePool())) {
        T = state.getAttributedType(
            createNullabilityAttr(Context, *attr, *inferNullability), T, T);
      }
    }
  }

  if (complainAboutMissingNullability == CAMN_Yes &&
      T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) &&
      D.isPrototypeContext() &&
      !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
    checkNullabilityConsistency(S, SimplePointerKind::Array,
                                D.getDeclSpec().getTypeSpecTypeLoc());
  }
}

bool ExpectNoDerefChunk =
    state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref);

// Walk the DeclTypeInfo, building the recursive type as we go.
// DeclTypeInfos are ordered from the identifier out, which is
// opposite of what we want :).
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
  unsigned chunkIndex = e - i - 1;
  state.setCurrentChunkIndex(chunkIndex);
  DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
  IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
  switch (DeclType.Kind) {
  case DeclaratorChunk::Paren:
    if (i == 0)
      warnAboutRedundantParens(S, D, T);
    T = S.BuildParenType(T);
    break;
  case DeclaratorChunk::BlockPointer:
    // If blocks are disabled, emit an error.
    if (!LangOpts.Blocks)
      S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;

    // Handle pointer nullability.
    inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc,
                            DeclType.EndLoc, DeclType.getAttrs(),
                            state.getDeclarator().getAttributePool());

    T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
    if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
      // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
      // qualified with const.
      if (LangOpts.OpenCL)
        DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
      T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
    }
    break;
  case DeclaratorChunk::Pointer:
    // Verify that we're not building a pointer to pointer to function with
    // exception specification.
    if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
      S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
      D.setInvalidType(true);
      // Build the type anyway.
    }

    // Handle pointer nullability
    inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
                            DeclType.EndLoc, DeclType.getAttrs(),
                            state.getDeclarator().getAttributePool());

    if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) {
      T = Context.getObjCObjectPointerType(T);
      if (DeclType.Ptr.TypeQuals)
        T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
      break;
    }

    // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
    // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
    // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
    if (LangOpts.OpenCL) {
      if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
          T->isBlockPointerType()) {
        S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
        D.setInvalidType(true);
      }
    }

    T = S.BuildPointerType(T, DeclType.Loc, Name);
    if (DeclType.Ptr.TypeQuals)
      T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
    break;
  case DeclaratorChunk::Reference: {
    // Verify that we're not building a reference to pointer to function with
    // exception specification.
    if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
      S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
      D.setInvalidType(true);
      // Build the type anyway.
    }
    T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);

    if (DeclType.Ref.HasRestrict)
      T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
    break;
  }
  case DeclaratorChunk::Array: {
    // Verify that we're not building an array of pointers to function with
    // exception specification.
    if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
      S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
      D.setInvalidType(true);
      // Build the type anyway.
    }
    DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
    Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
    ArrayType::ArraySizeModifier ASM;
    if (ATI.isStar)
      ASM = ArrayType::Star;
    else if (ATI.hasStatic)
      ASM = ArrayType::Static;
    else
      ASM = ArrayType::Normal;
    if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
      // FIXME: This check isn't quite right: it allows star in prototypes
      // for function definitions, and disallows some edge cases detailed
      // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
      S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
      ASM = ArrayType::Normal;
      D.setInvalidType(true);
    }

    // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
    // shall appear only in a declaration of a function parameter with an
    // array type, ...
    if (ASM == ArrayType::Static || ATI.TypeQuals) {
      if (!(D.isPrototypeContext() ||
            D.getContext() == DeclaratorContext::KNRTypeList)) {
        S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
            (ASM == ArrayType::Static ? "'static'" : "type qualifier");
        // Remove the 'static' and the type qualifiers.
        if (ASM == ArrayType::Static)
          ASM = ArrayType::Normal;
        ATI.TypeQuals = 0;
        D.setInvalidType(true);
      }

      // C99 6.7.5.2p1: ... and then only in the outermost array type
      // derivation.
      if (hasOuterPointerLikeChunk(D, chunkIndex)) {
        S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
          (ASM == ArrayType::Static ? "'static'" : "type qualifier");
        if (ASM == ArrayType::Static)
          ASM = ArrayType::Normal;
        ATI.TypeQuals = 0;
        D.setInvalidType(true);
      }
    }
    const AutoType *AT = T->getContainedAutoType();
    // Allow arrays of auto if we are a generic lambda parameter.
    // i.e. [](auto (&array)[5]) { return array[0]; }; OK
    if (AT && D.getContext() != DeclaratorContext::LambdaExprParameter) {
      // We've already diagnosed this for decltype(auto).
      if (!AT->isDecltypeAuto())
        S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
            << getPrintableNameForEntity(Name) << T;
      T = QualType();
      break;
    }

    // Array parameters can be marked nullable as well, although it's not
    // necessary if they're marked 'static'.
    if (complainAboutMissingNullability == CAMN_Yes &&
        !hasNullabilityAttr(DeclType.getAttrs()) &&
        ASM != ArrayType::Static &&
        D.isPrototypeContext() &&
        !hasOuterPointerLikeChunk(D, chunkIndex)) {
      checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
    }

    T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
                         SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
    break;
  }
  case DeclaratorChunk::Function: {
    // If the function declarator has a prototype (i.e. it is not () and
    // does not have a K&R-style identifier list), then the arguments are part
    // of the type, otherwise the argument list is ().
    DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
    IsQualifiedFunction =
        FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier();

    // Check for auto functions and trailing return type and adjust the
    // return type accordingly.
    if (!D.isInvalidType()) {
      // trailing-return-type is only required if we're declaring a function,
      // and not, for instance, a pointer to a function.
      if (D.getDeclSpec().hasAutoTypeSpec() &&
          !FTI.hasTrailingReturnType() && chunkIndex == 0) {
        if (!S.getLangOpts().CPlusPlus14) {
          S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
                 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
                     ? diag::err_auto_missing_trailing_return
                     : diag::err_deduced_return_type);
          T = Context.IntTy;
          D.setInvalidType(true);
        } else {
          S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
                 diag::warn_cxx11_compat_deduced_return_type);
        }
      } else if (FTI.hasTrailingReturnType()) {
        // T must be exactly 'auto' at this point. See CWG issue 681.
        if (isa<ParenType>(T)) {
          S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens)
              << T << D.getSourceRange();
          D.setInvalidType(true);
        } else if (D.getName().getKind() ==
                   UnqualifiedIdKind::IK_DeductionGuideName) {
          if (T != Context.DependentTy) {
            S.Diag(D.getDeclSpec().getBeginLoc(),
                   diag::err_deduction_guide_with_complex_decl)
                << D.getSourceRange();
            D.setInvalidType(true);
          }
        } else if (D.getContext() != DeclaratorContext::LambdaExpr &&
                   (T.hasQualifiers() || !isa<AutoType>(T) ||
                    cast<AutoType>(T)->getKeyword() !=
                        AutoTypeKeyword::Auto ||
                    cast<AutoType>(T)->isConstrained())) {
          S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
                 diag::err_trailing_return_without_auto)
              << T << D.getDeclSpec().getSourceRange();
          D.setInvalidType(true);
        }
        T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
        if (T.isNull()) {
          // An error occurred parsing the trailing return type.
          T = Context.IntTy;
          D.setInvalidType(true);
        } else if (AutoType *Auto = T->getContainedAutoType()) {
          // If the trailing return type contains an `auto`, we may need to
          // invent a template parameter for it, for cases like
          // `auto f() -> C auto` or `[](auto (*p) -> auto) {}`.
          InventedTemplateParameterInfo *InventedParamInfo = nullptr;
          if (D.getContext() == DeclaratorContext::Prototype)
            InventedParamInfo = &S.InventedParameterInfos.back();
          else if (D.getContext() == DeclaratorContext::LambdaExprParameter)
            InventedParamInfo = S.getCurLambda();
          if (InventedParamInfo) {
            std::tie(T, TInfo) = InventTemplateParameter(
                state, T, TInfo, Auto, *InventedParamInfo);
          }
        }
      } else {
        // This function type is not the type of the entity being declared,
        // so checking the 'auto' is not the responsibility of this chunk.
      }
    }

    // C99 6.7.5.3p1: The return type may not be a function or array type.
    // For conversion functions, we'll diagnose this particular error later.
    if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
        (D.getName().getKind() !=
         UnqualifiedIdKind::IK_ConversionFunctionId)) {
      unsigned diagID = diag::err_func_returning_array_function;
      // Last processing chunk in block context means this function chunk
      // represents the block.
      if (chunkIndex == 0 &&
          D.getContext() == DeclaratorContext::BlockLiteral)
        diagID = diag::err_block_returning_array_function;
      S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
      T = Context.IntTy;
      D.setInvalidType(true);
    }

    // Do not allow returning half FP value.
    // FIXME: This really should be in BuildFunctionType.
    if (T->isHalfType()) {
      if (S.getLangOpts().OpenCL) {
        if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
                                                    S.getLangOpts())) {
          S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
              << T << 0 /*pointer hint*/;
          D.setInvalidType(true);
        }
      } else if (!S.getLangOpts().NativeHalfArgsAndReturns &&
                 !S.Context.getTargetInfo().allowHalfArgsAndReturns()) {
        S.Diag(D.getIdentifierLoc(),
          diag::err_parameters_retval_cannot_have_fp16_type) << 1;
        D.setInvalidType(true);
      }
    }

    if (LangOpts.OpenCL) {
      // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
      // function.
      if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
          T->isPipeType()) {
        S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
            << T << 1 /*hint off*/;
        D.setInvalidType(true);
      }
      // OpenCL doesn't support variadic functions and blocks
      // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
      // We also allow here any toolchain reserved identifiers.
      if (FTI.isVariadic &&
          !S.getOpenCLOptions().isAvailableOption(
              "__cl_clang_variadic_functions", S.getLangOpts()) &&
          !(D.getIdentifier() &&
            ((D.getIdentifier()->getName() == "printf" &&
              LangOpts.getOpenCLCompatibleVersion() >= 120) ||
             D.getIdentifier()->getName().startswith("__")))) {
        S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
        D.setInvalidType(true);
      }
    }

    // Methods cannot return interface types. All ObjC objects are
    // passed by reference.
    if (T->isObjCObjectType()) {
      SourceLocation DiagLoc, FixitLoc;
      if (TInfo) {
        DiagLoc = TInfo->getTypeLoc().getBeginLoc();
        FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc());
      } else {
        DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
        FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc());
      }
      S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
        << 0 << T
        << FixItHint::CreateInsertion(FixitLoc, "*");

      T = Context.getObjCObjectPointerType(T);
      if (TInfo) {
        TypeLocBuilder TLB;
        TLB.pushFullCopy(TInfo->getTypeLoc());
        ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
        TLoc.setStarLoc(FixitLoc);
        TInfo = TLB.getTypeSourceInfo(Context, T);
      }

      D.setInvalidType(true);
    }

    // cv-qualifiers on return types are pointless except when the type is a
    // class type in C++.
    if ((T.getCVRQualifiers() || T->isAtomicType()) &&
        !(S.getLangOpts().CPlusPlus &&
          (T->isDependentType() || T->isRecordType()))) {
      if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
          D.getFunctionDefinitionKind() ==
              FunctionDefinitionKind::Definition) {
        // [6.9.1/3] qualified void return is invalid on a C
        // function definition.  Apparently ok on declarations and
        // in C++ though (!)
        S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
      } else
        diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);

      // C++2a [dcl.fct]p12:
      //   A volatile-qualified return type is deprecated
      if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20)
        S.Diag(DeclType.Loc, diag::warn_deprecated_volatile_return) << T;
    }

    // Objective-C ARC ownership qualifiers are ignored on the function
    // return type (by type canonicalization). Complain if this attribute
    // was written here.
    if (T.getQualifiers().hasObjCLifetime()) {
      SourceLocation AttrLoc;
      if (chunkIndex + 1 < D.getNumTypeObjects()) {
        DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
        for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) {
          if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
            AttrLoc = AL.getLoc();
            break;
          }
        }
      }
      if (AttrLoc.isInvalid()) {
        for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
          if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
            AttrLoc = AL.getLoc();
            break;
          }
        }
      }

      if (AttrLoc.isValid()) {
        // The ownership attributes are almost always written via
        // the predefined
        // __strong/__weak/__autoreleasing/__unsafe_unretained.
        if (AttrLoc.isMacroID())
          AttrLoc =
              S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin();

        S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
          << T.getQualifiers().getObjCLifetime();
      }
    }

    if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
      // C++ [dcl.fct]p6:
      //   Types shall not be defined in return or parameter types.
      TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
      S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
        << Context.getTypeDeclType(Tag);
    }

    // Exception specs are not allowed in typedefs. Complain, but add it
    // anyway.
    if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17)
      S.Diag(FTI.getExceptionSpecLocBeg(),
             diag::err_exception_spec_in_typedef)
          << (D.getContext() == DeclaratorContext::AliasDecl ||
              D.getContext() == DeclaratorContext::AliasTemplate);

    // If we see "T var();" or "T var(T());" at block scope, it is probably
    // an attempt to initialize a variable, not a function declaration.
    if (FTI.isAmbiguous)
      warnAboutAmbiguousFunction(S, D, DeclType, T);

    FunctionType::ExtInfo EI(
        getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex));

    // OpenCL disallows functions without a prototype, but it doesn't enforce
    // strict prototypes as in C2x because it allows a function definition to
    // have an identifier list. See OpenCL 3.0 6.11/g for more details.
    if (!FTI.NumParams && !FTI.isVariadic &&
        !LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL) {
      // Simple void foo(), where the incoming T is the result type.
      T = Context.getFunctionNoProtoType(T, EI);
    } else {
      // We allow a zero-parameter variadic function in C if the
      // function is marked with the "overloadable" attribute. Scan
      // for this attribute now.
      if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus)
        if (!D.getDeclarationAttributes().hasAttribute(
                ParsedAttr::AT_Overloadable) &&
            !D.getAttributes().hasAttribute(ParsedAttr::AT_Overloadable) &&
            !D.getDeclSpec().getAttributes().hasAttribute(
                ParsedAttr::AT_Overloadable))
          S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);

      if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
        // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
        // definition.
        S.Diag(FTI.Params[0].IdentLoc,
               diag::err_ident_list_in_fn_declaration);
        D.setInvalidType(true);
        // Recover by creating a K&R-style function type, if possible.
        T = (!LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL)
                ? Context.getFunctionNoProtoType(T, EI)
                : Context.IntTy;
        break;
      }

      FunctionProtoType::ExtProtoInfo EPI;
      EPI.ExtInfo = EI;
      EPI.Variadic = FTI.isVariadic;
      EPI.EllipsisLoc = FTI.getEllipsisLoc();
      EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
      EPI.TypeQuals.addCVRUQualifiers(
          FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers()
                               : 0);
      EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
                  : FTI.RefQualifierIsLValueRef? RQ_LValue
                  : RQ_RValue;

      // Otherwise, we have a function with a parameter list that is
      // potentially variadic.
      SmallVector<QualType, 16> ParamTys;
      ParamTys.reserve(FTI.NumParams);

      SmallVector<FunctionProtoType::ExtParameterInfo, 16>
        ExtParameterInfos(FTI.NumParams);
      bool HasAnyInterestingExtParameterInfos = false;

      for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
        ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
        QualType ParamTy = Param->getType();
        assert(!ParamTy.isNull() && "Couldn't parse type?")(static_cast <bool> (!ParamTy.isNull() && "Couldn't parse type?"
) ? void (0) : __assert_fail ("!ParamTy.isNull() && \"Couldn't parse type?\""
, "clang/lib/Sema/SemaType.cpp", 5416, __extension__ __PRETTY_FUNCTION__
));

        // Look for 'void'.  void is allowed only as a single parameter to a
        // function with no other parameters (C99 6.7.5.3p10).  We record
        // int(void) as a FunctionProtoType with an empty parameter list.
        if (ParamTy->isVoidType()) {
          // If this is something like 'float(int, void)', reject it.  'void'
          // is an incomplete type (C99 6.2.5p19) and function decls cannot
          // have parameters of incomplete type.
          if (FTI.NumParams != 1 || FTI.isVariadic) {
            S.Diag(FTI.Params[i].IdentLoc, diag::err_void_only_param);
            ParamTy = Context.IntTy;
            Param->setType(ParamTy);
          } else if (FTI.Params[i].Ident) {
            // Reject, but continue to parse 'int(void abc)'.
            S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
            ParamTy = Context.IntTy;
            Param->setType(ParamTy);
          } else {
            // Reject, but continue to parse 'float(const void)'.
            if (ParamTy.hasQualifiers())
              S.Diag(DeclType.Loc, diag::err_void_param_qualified);

            // Do not add 'void' to the list.
            break;
          }
        } else if (ParamTy->isHalfType()) {
          // Disallow half FP parameters.
          // FIXME: This really should be in BuildFunctionType.
          if (S.getLangOpts().OpenCL) {
            if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
                                                        S.getLangOpts())) {
              S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
                  << ParamTy << 0;
              D.setInvalidType();
              Param->setInvalidDecl();
            }
          } else if (!S.getLangOpts().NativeHalfArgsAndReturns &&
                     !S.Context.getTargetInfo().allowHalfArgsAndReturns()) {
            S.Diag(Param->getLocation(),
              diag::err_parameters_retval_cannot_have_fp16_type) << 0;
            D.setInvalidType();
          }
        } else if (!FTI.hasPrototype) {
          if (ParamTy->isPromotableIntegerType()) {
            ParamTy = Context.getPromotedIntegerType(ParamTy);
            Param->setKNRPromoted(true);
          } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
            if (BTy->getKind() == BuiltinType::Float) {
              ParamTy = Context.DoubleTy;
              Param->setKNRPromoted(true);
            }
          }
        } else if (S.getLangOpts().OpenCL && ParamTy->isBlockPointerType()) {
          // OpenCL 2.0 s6.12.5: A block cannot be a parameter of a function.
          S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
              << ParamTy << 1 /*hint off*/;
          D.setInvalidType();
        }

        if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
          ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
          HasAnyInterestingExtParameterInfos = true;
        }

        if (auto attr = Param->getAttr<ParameterABIAttr>()) {
          ExtParameterInfos[i] =
            ExtParameterInfos[i].withABI(attr->getABI());
          HasAnyInterestingExtParameterInfos = true;
        }

        if (Param->hasAttr<PassObjectSizeAttr>()) {
          ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
          HasAnyInterestingExtParameterInfos = true;
        }

        if (Param->hasAttr<NoEscapeAttr>()) {
          ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true);
          HasAnyInterestingExtParameterInfos = true;
        }

        ParamTys.push_back(ParamTy);
      }

      if (HasAnyInterestingExtParameterInfos) {
        EPI.ExtParameterInfos = ExtParameterInfos.data();
        checkExtParameterInfos(S, ParamTys, EPI,
            [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
      }

      SmallVector<QualType, 4> Exceptions;
      SmallVector<ParsedType, 2> DynamicExceptions;
      SmallVector<SourceRange, 2> DynamicExceptionRanges;
      Expr *NoexceptExpr = nullptr;

      if (FTI.getExceptionSpecType() == EST_Dynamic) {
        // FIXME: It's rather inefficient to have to split into two vectors
        // here.
        unsigned N = FTI.getNumExceptions();
        DynamicExceptions.reserve(N);
        DynamicExceptionRanges.reserve(N);
        for (unsigned I = 0; I != N; ++I) {
          DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
          DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
        }
      } else if (isComputedNoexcept(FTI.getExceptionSpecType())) {
        NoexceptExpr = FTI.NoexceptExpr;
      }

      S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
                                    FTI.getExceptionSpecType(),
                                    DynamicExceptions,
                                    DynamicExceptionRanges,
                                    NoexceptExpr,
                                    Exceptions,
                                    EPI.ExceptionSpec);

      // FIXME: Set address space from attrs for C++ mode here.
      // OpenCLCPlusPlus: A class member function has an address space.
      auto IsClassMember = [&]() {
        return (!state.getDeclarator().getCXXScopeSpec().isEmpty() &&
                state.getDeclarator()
                        .getCXXScopeSpec()
                        .getScopeRep()
                        ->getKind() == NestedNameSpecifier::TypeSpec) ||
               state.getDeclarator().getContext() ==
                   DeclaratorContext::Member ||
               state.getDeclarator().getContext() ==
                   DeclaratorContext::LambdaExpr;
      };

      if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) {
        LangAS ASIdx = LangAS::Default;
        // Take address space attr if any and mark as invalid to avoid adding
        // them later while creating QualType.
        if (FTI.MethodQualifiers)
          for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) {
            LangAS ASIdxNew = attr.asOpenCLLangAS();
            if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew,
                                                    attr.getLoc()))
              D.setInvalidType(true);
            else
              ASIdx = ASIdxNew;
          }
        // If a class member function's address space is not set, set it to
        // __generic.
        LangAS AS =
            (ASIdx == LangAS::Default ? S.getDefaultCXXMethodAddrSpace()
                                      : ASIdx);
        EPI.TypeQuals.addAddressSpace(AS);
      }
      T = Context.getFunctionType(T, ParamTys, EPI);
    }
    break;
  }
  case DeclaratorChunk::MemberPointer: {
    // The scope spec must refer to a class, or be dependent.
    CXXScopeSpec &SS = DeclType.Mem.Scope();
    QualType ClsType;

    // Handle pointer nullability.
    inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc,
                            DeclType.EndLoc, DeclType.getAttrs(),
                            state.getDeclarator().getAttributePool());

    if (SS.isInvalid()) {
      // Avoid emitting extra errors if we already errored on the scope.
      D.setInvalidType(true);
    } else if (S.isDependentScopeSpecifier(SS) ||
               isa_and_nonnull<CXXRecordDecl>(S.computeDeclContext(SS))) {
      NestedNameSpecifier *NNS = SS.getScopeRep();
      NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
      switch (NNS->getKind()) {
      case NestedNameSpecifier::Identifier:
        ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
                                               NNS->getAsIdentifier());
        break;

      case NestedNameSpecifier::Namespace:
      case NestedNameSpecifier::NamespaceAlias:
      case NestedNameSpecifier::Global:
      case NestedNameSpecifier::Super:
        llvm_unreachable("Nested-name-specifier must name a type")::llvm::llvm_unreachable_internal("Nested-name-specifier must name a type"
, "clang/lib/Sema/SemaType.cpp", 5598);

      case NestedNameSpecifier::TypeSpec:
      case NestedNameSpecifier::TypeSpecWithTemplate:
        ClsType = QualType(NNS->getAsType(), 0);
        // Note: if the NNS has a prefix and ClsType is a nondependent
        // TemplateSpecializationType, then the NNS prefix is NOT included
        // in ClsType; hence we wrap ClsType into an ElaboratedType.
        // NOTE: in particular, no wrap occurs if ClsType already is an
        // Elaborated, DependentName, or DependentTemplateSpecialization.
        if (isa<TemplateSpecializationType>(NNS->getAsType()))
          ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
        break;
      }
    } else {
      S.Diag(DeclType.Mem.Scope().getBeginLoc(),
           diag::err_illegal_decl_mempointer_in_nonclass)
        << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
        << DeclType.Mem.Scope().getRange();
      D.setInvalidType(true);
    }

    if (!ClsType.isNull())
      T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
                                   D.getIdentifier());
    if (T.isNull()) {
      T = Context.IntTy;
      D.setInvalidType(true);
    } else if (DeclType.Mem.TypeQuals) {
      T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
    }
    break;
  }

  case DeclaratorChunk::Pipe: {
    T = S.BuildReadPipeType(T, DeclType.Loc);
    processTypeAttrs(state, T, TAL_DeclSpec,
                     D.getMutableDeclSpec().getAttributes());
    break;
  }
  }

  if (T.isNull()) {
    D.setInvalidType(true);
    T = Context.IntTy;
  }

  // See if there are any attributes on this declarator chunk.
  processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs());

  if (DeclType.Kind != DeclaratorChunk::Paren) {
    if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType))
      S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array);

    ExpectNoDerefChunk = state.didParseNoDeref();
  }
}

if (ExpectNoDerefChunk)
  S.Diag(state.getDeclarator().getBeginLoc(),
         diag::warn_noderef_on_non_pointer_or_array);

// GNU warning -Wstrict-prototypes
//   Warn if a function declaration or definition is without a prototype.
//   This warning is issued for all kinds of unprototyped function
//   declarations (i.e. function type typedef, function pointer etc.)
//   C99 6.7.5.3p14:
//   The empty list in a function declarator that is not part of a definition
//   of that function specifies that no information about the number or types
//   of the parameters is supplied.
// See ActOnFinishFunctionBody() and MergeFunctionDecl() for handling of
// function declarations whose behavior changes in C2x.
if (!LangOpts.requiresStrictPrototypes()) {
  bool IsBlock = false;
  for (const DeclaratorChunk &DeclType : D.type_objects()) {
    switch (DeclType.Kind) {
    case DeclaratorChunk::BlockPointer:
      IsBlock = true;
      break;
    case DeclaratorChunk::Function: {
      const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
      // We suppress the warning when there's no LParen location, as this
      // indicates the declaration was an implicit declaration, which gets
      // warned about separately via -Wimplicit-function-declaration. We also
      // suppress the warning when we know the function has a prototype.
      if (!FTI.hasPrototype && FTI.NumParams == 0 && !FTI.isVariadic &&
          FTI.getLParenLoc().isValid())
        S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
            << IsBlock
            << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
      IsBlock = false;
      break;
    }
    default:
      break;
    }
  }
}

assert(!T.isNull() && "T must not be null after this point")(static_cast <bool> (!T.isNull() && "T must not be null after this point"
) ? void (0) : __assert_fail ("!T.isNull() && \"T must not be null after this point\""
, "clang/lib/Sema/SemaType.cpp", 5697, __extension__ __PRETTY_FUNCTION__
));

if (LangOpts.CPlusPlus && T->isFunctionType()) {
  const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
  assert(FnTy && "Why oh why is there not a FunctionProtoType here?")(static_cast <bool> (FnTy && "Why oh why is there not a FunctionProtoType here?"
) ? void (0) : __assert_fail ("FnTy && \"Why oh why is there not a FunctionProtoType here?\""
, "clang/lib/Sema/SemaType.cpp", 5701, __extension__ __PRETTY_FUNCTION__
));

  // C++ 8.3.5p4:
  //   A cv-qualifier-seq shall only be part of the function type
  //   for a nonstatic member function, the function type to which a pointer
  //   to member refers, or the top-level function type of a function typedef
  //   declaration.
  //
  // Core issue 547 also allows cv-qualifiers on function types that are
  // top-level template type arguments.
  enum { NonMember, Member, DeductionGuide } Kind = NonMember;
  if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName)
    Kind = DeductionGuide;
  else if (!D.getCXXScopeSpec().isSet()) {
    if ((D.getContext() == DeclaratorContext::Member ||
         D.getContext() == DeclaratorContext::LambdaExpr) &&
        !D.getDeclSpec().isFriendSpecified())
      Kind = Member;
  } else {
    DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
    if (!DC || DC->isRecord())
      Kind = Member;
  }

  // C++11 [dcl.fct]p6 (w/DR1417):
  // An attempt to specify a function type with a cv-qualifier-seq or a
  // ref-qualifier (including by typedef-name) is ill-formed unless it is:
  //  - the function type for a non-static member function,
  //  - the function type to which a pointer to member refers,
  //  - the top-level function type of a function typedef declaration or
  //    alias-declaration,
  //  - the type-id in the default argument of a type-parameter, or
  //  - the type-id of a template-argument for a type-parameter
  //
  // FIXME: Checking this here is insufficient. We accept-invalid on:
  //
  //   template<typename T> struct S { void f(T); };
  //   S<int() const> s;
  //
  // ... for instance.
  if (IsQualifiedFunction &&
      !(Kind == Member &&
        D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
      !IsTypedefName && D.getContext() != DeclaratorContext::TemplateArg &&
      D.getContext() != DeclaratorContext::TemplateTypeArg) {
    SourceLocation Loc = D.getBeginLoc();
    SourceRange RemovalRange;
    unsigned I;
    if (D.isFunctionDeclarator(I)) {
      SmallVector<SourceLocation, 4> RemovalLocs;
      const DeclaratorChunk &Chunk = D.getTypeObject(I);
      assert(Chunk.Kind == DeclaratorChunk::Function)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Function
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Function"
, "clang/lib/Sema/SemaType.cpp", 5752, __extension__ __PRETTY_FUNCTION__
));

      if (Chunk.Fun.hasRefQualifier())
        RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());

      if (Chunk.Fun.hasMethodTypeQualifiers())
        Chunk.Fun.MethodQualifiers->forEachQualifier(
            [&](DeclSpec::TQ TypeQual, StringRef QualName,
                SourceLocation SL) { RemovalLocs.push_back(SL); });

      if (!RemovalLocs.empty()) {
        llvm::sort(RemovalLocs,
                   BeforeThanCompare<SourceLocation>(S.getSourceManager()));
        RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
        Loc = RemovalLocs.front();
      }
    }

    S.Diag(Loc, diag::err_invalid_qualified_function_type)
      << Kind << D.isFunctionDeclarator() << T
      << getFunctionQualifiersAsString(FnTy)
      << FixItHint::CreateRemoval(RemovalRange);

    // Strip the cv-qualifiers and ref-qualifiers from the type.
    FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
    EPI.TypeQuals.removeCVRQualifiers();
    EPI.RefQualifier = RQ_None;

    T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
                                EPI);
    // Rebuild any parens around the identifier in the function type.
    for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
      if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
        break;
      T = S.BuildParenType(T);
    }
  }
}

// Apply any undistributed attributes from the declaration or declarator.
ParsedAttributesView NonSlidingAttrs;
for (ParsedAttr &AL : D.getDeclarationAttributes()) {
  if (!AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
    NonSlidingAttrs.addAtEnd(&AL);
  }
}
processTypeAttrs(state, T, TAL_DeclName, NonSlidingAttrs);
processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());

// Diagnose any ignored type attributes.
state.diagnoseIgnoredTypeAttrs(T);

// C++0x [dcl.constexpr]p9:
//  A constexpr specifier used in an object declaration declares the object
//  as const.
if (D.getDeclSpec().getConstexprSpecifier() == ConstexprSpecKind::Constexpr &&
    T->isObjectType())
  T.addConst();

// C++2a [dcl.fct]p4:
//   A parameter with volatile-qualified type is deprecated
if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20 &&
    (D.getContext() == DeclaratorContext::Prototype ||
     D.getContext() == DeclaratorContext::LambdaExprParameter))
  S.Diag(D.getIdentifierLoc(), diag::warn_deprecated_volatile_param) << T;

// If there was an ellipsis in the declarator, the declaration declares a
// parameter pack whose type may be a pack expansion type.
if (D.hasEllipsis()) {
  // C++0x [dcl.fct]p13:
  //   A declarator-id or abstract-declarator containing an ellipsis shall
  //   only be used in a parameter-declaration. Such a parameter-declaration
  //   is a parameter pack (14.5.3). [...]
  switch (D.getContext()) {
  case DeclaratorContext::Prototype:
  case DeclaratorContext::LambdaExprParameter:
  case DeclaratorContext::RequiresExpr:
    // C++0x [dcl.fct]p13:
    //   [...] When it is part of a parameter-declaration-clause, the
    //   parameter pack is a function parameter pack (14.5.3). The type T
    //   of the declarator-id of the function parameter pack shall contain
    //   a template parameter pack; each template parameter pack in T is
    //   expanded by the function parameter pack.
    //
    // We represent function parameter packs as function parameters whose
    // type is a pack expansion.
    if (!T->containsUnexpandedParameterPack() &&
        (!LangOpts.CPlusPlus20 || !T->getContainedAutoType())) {
      S.Diag(D.getEllipsisLoc(),
           diag::err_function_parameter_pack_without_parameter_packs)
        << T <<  D.getSourceRange();
      D.setEllipsisLoc(SourceLocation());
    } else {
      T = Context.getPackExpansionType(T, None, /*ExpectPackInType=*/false);
    }
    break;
  case DeclaratorContext::TemplateParam:
    // C++0x [temp.param]p15:
    //   If a template-parameter is a [...] is a parameter-declaration that
    //   declares a parameter pack (8.3.5), then the template-parameter is a
    //   template parameter pack (14.5.3).
    //
    // Note: core issue 778 clarifies that, if there are any unexpanded
    // parameter packs in the type of the non-type template parameter, then
    // it expands those parameter packs.
    if (T->containsUnexpandedParameterPack())
      T = Context.getPackExpansionType(T, None);
    else
      S.Diag(D.getEllipsisLoc(),
             LangOpts.CPlusPlus11
               ? diag::warn_cxx98_compat_variadic_templates
               : diag::ext_variadic_templates);
    break;

  case DeclaratorContext::File:
  case DeclaratorContext::KNRTypeList:
  case DeclaratorContext::ObjCParameter: // FIXME: special diagnostic here?
  case DeclaratorContext::ObjCResult:    // FIXME: special diagnostic here?
  case DeclaratorContext::TypeName:
  case DeclaratorContext::FunctionalCast:
  case DeclaratorContext::CXXNew:
  case DeclaratorContext::AliasDecl:
  case DeclaratorContext::AliasTemplate:
  case DeclaratorContext::Member:
  case DeclaratorContext::Block:
  case DeclaratorContext::ForInit:
  case DeclaratorContext::SelectionInit:
  case DeclaratorContext::Condition:
  case DeclaratorContext::CXXCatch:
  case DeclaratorContext::ObjCCatch:
  case DeclaratorContext::BlockLiteral:
  case DeclaratorContext::LambdaExpr:
  case DeclaratorContext::ConversionId:
  case DeclaratorContext::TrailingReturn:
  case DeclaratorContext::TrailingReturnVar:
  case DeclaratorContext::TemplateArg:
  case DeclaratorContext::TemplateTypeArg:
  case DeclaratorContext::Association:
    // FIXME: We may want to allow parameter packs in block-literal contexts
    // in the future.
    S.Diag(D.getEllipsisLoc(),
           diag::err_ellipsis_in_declarator_not_parameter);
    D.setEllipsisLoc(SourceLocation());
    break;
  }
}

assert(!T.isNull() && "T must not be null at the end of this function")(static_cast <bool> (!T.isNull() && "T must not be null at the end of this function"
) ? void (0) : __assert_fail ("!T.isNull() && \"T must not be null at the end of this function\""
, "clang/lib/Sema/SemaType.cpp", 5899, __extension__ __PRETTY_FUNCTION__
));
if (D.isInvalidType())
  return Context.getTrivialTypeSourceInfo(T);

return GetTypeSourceInfoForDeclarator(state, T, TInfo);
5904}

5906/// GetTypeForDeclarator - Convert the type for the specified
5907/// declarator to Type instances.
5908///
5909/// The result of this call will never be null, but the associated
5910/// type may be a null type if there's an unrecoverable error.
5911TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
// Determine the type of the declarator. Not all forms of declarator
// have a type.

TypeProcessingState state(*this, D);

TypeSourceInfo *ReturnTypeInfo = nullptr;
QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
  inferARCWriteback(state, T);

return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
5923}

5925static void transferARCOwnershipToDeclSpec(Sema &S,
                                         QualType &declSpecTy,
                                         Qualifiers::ObjCLifetime ownership) {
if (declSpecTy->isObjCRetainableType() &&
    declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
  Qualifiers qs;
  qs.addObjCLifetime(ownership);
  declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
}
5934}

5936static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
                                          Qualifiers::ObjCLifetime ownership,
                                          unsigned chunkIndex) {
Sema &S = state.getSema();
Declarator &D = state.getDeclarator();

// Look for an explicit lifetime attribute.
DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership))
  return;

const char *attrStr = nullptr;
switch (ownership) {
case Qualifiers::OCL_None: llvm_unreachable("no ownership!")::llvm::llvm_unreachable_internal("no ownership!", "clang/lib/Sema/SemaType.cpp"
, 5949);
case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
case Qualifiers::OCL_Strong: attrStr = "strong"; break;
case Qualifiers::OCL_Weak: attrStr = "weak"; break;
case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
}

IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
Arg->Ident = &S.Context.Idents.get(attrStr);
Arg->Loc = SourceLocation();

ArgsUnion Args(Arg);

// If there wasn't one, add one (with an invalid source location
// so that we don't make an AttributedType for it).
ParsedAttr *attr = D.getAttributePool().create(
    &S.Context.Idents.get("objc_ownership"), SourceLocation(),
    /*scope*/ nullptr, SourceLocation(),
    /*args*/ &Args, 1, ParsedAttr::AS_GNU);
chunk.getAttrs().addAtEnd(attr);
// TODO: mark whether we did this inference?
5970}

5972/// Used for transferring ownership in casts resulting in l-values.
5973static void transferARCOwnership(TypeProcessingState &state,
                               QualType &declSpecTy,
                               Qualifiers::ObjCLifetime ownership) {
Sema &S = state.getSema();
Declarator &D = state.getDeclarator();

int inner = -1;
bool hasIndirection = false;
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
  DeclaratorChunk &chunk = D.getTypeObject(i);
  switch (chunk.Kind) {
  case DeclaratorChunk::Paren:
    // Ignore parens.
    break;

  case DeclaratorChunk::Array:
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::Pointer:
    if (inner != -1)
      hasIndirection = true;
    inner = i;
    break;

  case DeclaratorChunk::BlockPointer:
    if (inner != -1)
      transferARCOwnershipToDeclaratorChunk(state, ownership, i);
    return;

  case DeclaratorChunk::Function:
  case DeclaratorChunk::MemberPointer:
  case DeclaratorChunk::Pipe:
    return;
  }
}

if (inner == -1)
  return;

DeclaratorChunk &chunk = D.getTypeObject(inner);
if (chunk.Kind == DeclaratorChunk::Pointer) {
  if (declSpecTy->isObjCRetainableType())
    return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
  if (declSpecTy->isObjCObjectType() && hasIndirection)
    return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
} else {
  assert(chunk.Kind == DeclaratorChunk::Array ||(static_cast <bool> (chunk.Kind == DeclaratorChunk::Array
 || chunk.Kind == DeclaratorChunk::Reference) ? void (0) : __assert_fail
 ("chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk::Reference"
, "clang/lib/Sema/SemaType.cpp", 6019, __extension__ __PRETTY_FUNCTION__
))
         chunk.Kind == DeclaratorChunk::Reference)(static_cast <bool> (chunk.Kind == DeclaratorChunk::Array
 || chunk.Kind == DeclaratorChunk::Reference) ? void (0) : __assert_fail
 ("chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk::Reference"
, "clang/lib/Sema/SemaType.cpp", 6019, __extension__ __PRETTY_FUNCTION__
));
  return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
}
6022}

6024TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
TypeProcessingState state(*this, D);

TypeSourceInfo *ReturnTypeInfo = nullptr;
QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);

if (getLangOpts().ObjC) {
  Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
  if (ownership != Qualifiers::OCL_None)
    transferARCOwnership(state, declSpecTy, ownership);
}

return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
6037}

6039static void fillAttributedTypeLoc(AttributedTypeLoc TL,
                                TypeProcessingState &State) {
TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr()));
6042}

6044namespace {
class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
  Sema &SemaRef;
  ASTContext &Context;
  TypeProcessingState &State;
  const DeclSpec &DS;

public:
  TypeSpecLocFiller(Sema &S, ASTContext &Context, TypeProcessingState &State,
                    const DeclSpec &DS)
      : SemaRef(S), Context(Context), State(State), DS(DS) {}

  void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
    Visit(TL.getModifiedLoc());
    fillAttributedTypeLoc(TL, State);
  }
  void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
    Visit(TL.getWrappedLoc());
  }
  void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
    Visit(TL.getInnerLoc());
    TL.setExpansionLoc(
        State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
  }
  void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
    Visit(TL.getUnqualifiedLoc());
  }
  // Allow to fill pointee's type locations, e.g.,
  //   int __attr * __attr * __attr *p;
  void VisitPointerTypeLoc(PointerTypeLoc TL) { Visit(TL.getNextTypeLoc()); }
  void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
    TL.setNameLoc(DS.getTypeSpecTypeLoc());
  }
  void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
    TL.setNameLoc(DS.getTypeSpecTypeLoc());
    // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
    // addition field. What we have is good enough for display of location
    // of 'fixit' on interface name.
    TL.setNameEndLoc(DS.getEndLoc());
  }
  void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
    TypeSourceInfo *RepTInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
    TL.copy(RepTInfo->getTypeLoc());
  }
  void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
    TypeSourceInfo *RepTInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
    TL.copy(RepTInfo->getTypeLoc());
  }
  void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);

    // If we got no declarator info from previous Sema routines,
    // just fill with the typespec loc.
    if (!TInfo) {
      TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
      return;
    }

    TypeLoc OldTL = TInfo->getTypeLoc();
    if (TInfo->getType()->getAs<ElaboratedType>()) {
      ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
      TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
          .castAs<TemplateSpecializationTypeLoc>();
      TL.copy(NamedTL);
    } else {
      TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
      assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc())(static_cast <bool> (TL.getRAngleLoc() == OldTL.castAs<
TemplateSpecializationTypeLoc>().getRAngleLoc()) ? void (0
) : __assert_fail ("TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc()"
, "clang/lib/Sema/SemaType.cpp", 6113, __extension__ __PRETTY_FUNCTION__
));
    }

  }
  void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
    assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr ||(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_typeofExpr || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr"
, "clang/lib/Sema/SemaType.cpp", 6119, __extension__ __PRETTY_FUNCTION__
))
           DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr)(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_typeofExpr || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr"
, "clang/lib/Sema/SemaType.cpp", 6119, __extension__ __PRETTY_FUNCTION__
));
    TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
    TL.setParensRange(DS.getTypeofParensRange());
  }
  void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
    assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType ||(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_typeofType || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofType || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType"
, "clang/lib/Sema/SemaType.cpp", 6125, __extension__ __PRETTY_FUNCTION__
))
           DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType)(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_typeofType || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofType || DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType"
, "clang/lib/Sema/SemaType.cpp", 6125, __extension__ __PRETTY_FUNCTION__
));
    TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
    TL.setParensRange(DS.getTypeofParensRange());
    assert(DS.getRepAsType())(static_cast <bool> (DS.getRepAsType()) ? void (0) : __assert_fail
 ("DS.getRepAsType()", "clang/lib/Sema/SemaType.cpp", 6128, __extension__
 __PRETTY_FUNCTION__));
    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
    TL.setUnmodifiedTInfo(TInfo);
  }
  void VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
    assert(DS.getTypeSpecType() == DeclSpec::TST_decltype)(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_decltype) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_decltype"
, "clang/lib/Sema/SemaType.cpp", 6134, __extension__ __PRETTY_FUNCTION__
));
    TL.setDecltypeLoc(DS.getTypeSpecTypeLoc());
    TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
  }
  void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
    assert(DS.isTransformTypeTrait(DS.getTypeSpecType()))(static_cast <bool> (DS.isTransformTypeTrait(DS.getTypeSpecType
())) ? void (0) : __assert_fail ("DS.isTransformTypeTrait(DS.getTypeSpecType())"
, "clang/lib/Sema/SemaType.cpp", 6139, __extension__ __PRETTY_FUNCTION__
));
    TL.setKWLoc(DS.getTypeSpecTypeLoc());
    TL.setParensRange(DS.getTypeofParensRange());
    assert(DS.getRepAsType())(static_cast <bool> (DS.getRepAsType()) ? void (0) : __assert_fail
 ("DS.getRepAsType()", "clang/lib/Sema/SemaType.cpp", 6142, __extension__
 __PRETTY_FUNCTION__));
    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
    TL.setUnderlyingTInfo(TInfo);
  }
  void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
    // By default, use the source location of the type specifier.
    TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
    if (TL.needsExtraLocalData()) {
      // Set info for the written builtin specifiers.
      TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
      // Try to have a meaningful source location.
      if (TL.getWrittenSignSpec() != TypeSpecifierSign::Unspecified)
        TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
      if (TL.getWrittenWidthSpec() != TypeSpecifierWidth::Unspecified)
        TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
    }
  }
  void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
    if (DS.getTypeSpecType() == TST_typename) {
      TypeSourceInfo *TInfo = nullptr;
      Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
      if (TInfo)
        if (auto ETL = TInfo->getTypeLoc().getAs<ElaboratedTypeLoc>()) {
          TL.copy(ETL);
          return;
        }
    }
    const ElaboratedType *T = TL.getTypePtr();
    TL.setElaboratedKeywordLoc(T->getKeyword() != ETK_None
                                   ? DS.getTypeSpecTypeLoc()
                                   : SourceLocation());
    const CXXScopeSpec& SS = DS.getTypeSpecScope();
    TL.setQualifierLoc(SS.getWithLocInContext(Context));
    Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
  }
  void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
    assert(DS.getTypeSpecType() == TST_typename)(static_cast <bool> (DS.getTypeSpecType() == TST_typename
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_typename"
, "clang/lib/Sema/SemaType.cpp", 6179, __extension__ __PRETTY_FUNCTION__
));
    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
    assert(TInfo)(static_cast <bool> (TInfo) ? void (0) : __assert_fail (
"TInfo", "clang/lib/Sema/SemaType.cpp", 6182, __extension__ __PRETTY_FUNCTION__
));
    TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
  }
  void VisitDependentTemplateSpecializationTypeLoc(
                               DependentTemplateSpecializationTypeLoc TL) {
    assert(DS.getTypeSpecType() == TST_typename)(static_cast <bool> (DS.getTypeSpecType() == TST_typename
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_typename"
, "clang/lib/Sema/SemaType.cpp", 6187, __extension__ __PRETTY_FUNCTION__
));
    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
    assert(TInfo)(static_cast <bool> (TInfo) ? void (0) : __assert_fail (
"TInfo", "clang/lib/Sema/SemaType.cpp", 6190, __extension__ __PRETTY_FUNCTION__
));
    TL.copy(
        TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
  }
  void VisitAutoTypeLoc(AutoTypeLoc TL) {
    assert(DS.getTypeSpecType() == TST_auto ||(static_cast <bool> (DS.getTypeSpecType() == TST_auto ||
 DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType
() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_auto || DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified"
, "clang/lib/Sema/SemaType.cpp", 6198, __extension__ __PRETTY_FUNCTION__
))
           DS.getTypeSpecType() == TST_decltype_auto ||(static_cast <bool> (DS.getTypeSpecType() == TST_auto ||
 DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType
() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_auto || DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified"
, "clang/lib/Sema/SemaType.cpp", 6198, __extension__ __PRETTY_FUNCTION__
))
           DS.getTypeSpecType() == TST_auto_type ||(static_cast <bool> (DS.getTypeSpecType() == TST_auto ||
 DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType
() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_auto || DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified"
, "clang/lib/Sema/SemaType.cpp", 6198, __extension__ __PRETTY_FUNCTION__
))
           DS.getTypeSpecType() == TST_unspecified)(static_cast <bool> (DS.getTypeSpecType() == TST_auto ||
 DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType
() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == TST_auto || DS.getTypeSpecType() == TST_decltype_auto || DS.getTypeSpecType() == TST_auto_type || DS.getTypeSpecType() == TST_unspecified"
, "clang/lib/Sema/SemaType.cpp", 6198, __extension__ __PRETTY_FUNCTION__
));
    TL.setNameLoc(DS.getTypeSpecTypeLoc());
    if (DS.getTypeSpecType() == TST_decltype_auto)
      TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
    if (!DS.isConstrainedAuto())
      return;
    TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId();
    if (!TemplateId)
      return;
    if (DS.getTypeSpecScope().isNotEmpty())
      TL.setNestedNameSpecifierLoc(
          DS.getTypeSpecScope().getWithLocInContext(Context));
    else
      TL.setNestedNameSpecifierLoc(NestedNameSpecifierLoc());
    TL.setTemplateKWLoc(TemplateId->TemplateKWLoc);
    TL.setConceptNameLoc(TemplateId->TemplateNameLoc);
    TL.setFoundDecl(nullptr);
    TL.setLAngleLoc(TemplateId->LAngleLoc);
    TL.setRAngleLoc(TemplateId->RAngleLoc);
    if (TemplateId->NumArgs == 0)
      return;
    TemplateArgumentListInfo TemplateArgsInfo;
    ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                       TemplateId->NumArgs);
    SemaRef.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
    for (unsigned I = 0; I < TemplateId->NumArgs; ++I)
      TL.setArgLocInfo(I, TemplateArgsInfo.arguments()[I].getLocInfo());
  }
  void VisitTagTypeLoc(TagTypeLoc TL) {
    TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
  }
  void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
    // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
    // or an _Atomic qualifier.
    if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
      TL.setKWLoc(DS.getTypeSpecTypeLoc());
      TL.setParensRange(DS.getTypeofParensRange());

      TypeSourceInfo *TInfo = nullptr;
      Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
      assert(TInfo)(static_cast <bool> (TInfo) ? void (0) : __assert_fail (
"TInfo", "clang/lib/Sema/SemaType.cpp", 6238, __extension__ __PRETTY_FUNCTION__
));
      TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
    } else {
      TL.setKWLoc(DS.getAtomicSpecLoc());
      // No parens, to indicate this was spelled as an _Atomic qualifier.
      TL.setParensRange(SourceRange());
      Visit(TL.getValueLoc());
    }
  }

  void VisitPipeTypeLoc(PipeTypeLoc TL) {
    TL.setKWLoc(DS.getTypeSpecTypeLoc());

    TypeSourceInfo *TInfo = nullptr;
    Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
    TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
  }

  void VisitExtIntTypeLoc(BitIntTypeLoc TL) {
    TL.setNameLoc(DS.getTypeSpecTypeLoc());
  }

  void VisitDependentExtIntTypeLoc(DependentBitIntTypeLoc TL) {
    TL.setNameLoc(DS.getTypeSpecTypeLoc());
  }

  void VisitTypeLoc(TypeLoc TL) {
    // FIXME: add other typespec types and change this to an assert.
    TL.initialize(Context, DS.getTypeSpecTypeLoc());
  }
};

class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
  ASTContext &Context;
  TypeProcessingState &State;
  const DeclaratorChunk &Chunk;

public:
  DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State,
                      const DeclaratorChunk &Chunk)
      : Context(Context), State(State), Chunk(Chunk) {}

  void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
    llvm_unreachable("qualified type locs not expected here!")::llvm::llvm_unreachable_internal("qualified type locs not expected here!"
, "clang/lib/Sema/SemaType.cpp", 6281);
  }
  void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
    llvm_unreachable("decayed type locs not expected here!")::llvm::llvm_unreachable_internal("decayed type locs not expected here!"
, "clang/lib/Sema/SemaType.cpp", 6284);
  }

  void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
    fillAttributedTypeLoc(TL, State);
  }
  void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
    // nothing
  }
  void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
    // nothing
  }
  void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::BlockPointer)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::BlockPointer
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::BlockPointer"
, "clang/lib/Sema/SemaType.cpp", 6297, __extension__ __PRETTY_FUNCTION__
));
    TL.setCaretLoc(Chunk.Loc);
  }
  void VisitPointerTypeLoc(PointerTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Pointer)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Pointer
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pointer"
, "clang/lib/Sema/SemaType.cpp", 6301, __extension__ __PRETTY_FUNCTION__
));
    TL.setStarLoc(Chunk.Loc);
  }
  void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Pointer)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Pointer
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pointer"
, "clang/lib/Sema/SemaType.cpp", 6305, __extension__ __PRETTY_FUNCTION__
));
    TL.setStarLoc(Chunk.Loc);
  }
  void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::MemberPointer)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::MemberPointer
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::MemberPointer"
, "clang/lib/Sema/SemaType.cpp", 6309, __extension__ __PRETTY_FUNCTION__
));
    const CXXScopeSpec& SS = Chunk.Mem.Scope();
    NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);

    const Type* ClsTy = TL.getClass();
    QualType ClsQT = QualType(ClsTy, 0);
    TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
    // Now copy source location info into the type loc component.
    TypeLoc ClsTL = ClsTInfo->getTypeLoc();
    switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
    case NestedNameSpecifier::Identifier:
      assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc")(static_cast <bool> (isa<DependentNameType>(ClsTy
) && "Unexpected TypeLoc") ? void (0) : __assert_fail
 ("isa<DependentNameType>(ClsTy) && \"Unexpected TypeLoc\""
, "clang/lib/Sema/SemaType.cpp", 6320, __extension__ __PRETTY_FUNCTION__
));
      {
        DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
        DNTLoc.setElaboratedKeywordLoc(SourceLocation());
        DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
        DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
      }
      break;

    case NestedNameSpecifier::TypeSpec:
    case NestedNameSpecifier::TypeSpecWithTemplate:
      if (isa<ElaboratedType>(ClsTy)) {
        ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
        ETLoc.setElaboratedKeywordLoc(SourceLocation());
        ETLoc.setQualifierLoc(NNSLoc.getPrefix());
        TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
        NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
      } else {
        ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
      }
      break;

    case NestedNameSpecifier::Namespace:
    case NestedNameSpecifier::NamespaceAlias:
    case NestedNameSpecifier::Global:
    case NestedNameSpecifier::Super:
      llvm_unreachable("Nested-name-specifier must name a type")::llvm::llvm_unreachable_internal("Nested-name-specifier must name a type"
, "clang/lib/Sema/SemaType.cpp", 6346);
    }

    // Finally fill in MemberPointerLocInfo fields.
    TL.setStarLoc(Chunk.Mem.StarLoc);
    TL.setClassTInfo(ClsTInfo);
  }
  void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Reference)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Reference
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Reference"
, "clang/lib/Sema/SemaType.cpp", 6354, __extension__ __PRETTY_FUNCTION__
));
    // 'Amp' is misleading: this might have been originally
    /// spelled with AmpAmp.
    TL.setAmpLoc(Chunk.Loc);
  }
  void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Reference)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Reference
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Reference"
, "clang/lib/Sema/SemaType.cpp", 6360, __extension__ __PRETTY_FUNCTION__
));
    assert(!Chunk.Ref.LValueRef)(static_cast <bool> (!Chunk.Ref.LValueRef) ? void (0) :
 __assert_fail ("!Chunk.Ref.LValueRef", "clang/lib/Sema/SemaType.cpp"
, 6361, __extension__ __PRETTY_FUNCTION__));
    TL.setAmpAmpLoc(Chunk.Loc);
  }
  void VisitArrayTypeLoc(ArrayTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Array)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Array
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Array"
, "clang/lib/Sema/SemaType.cpp", 6365, __extension__ __PRETTY_FUNCTION__
));
    TL.setLBracketLoc(Chunk.Loc);
    TL.setRBracketLoc(Chunk.EndLoc);
    TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
  }
  void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Function)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Function
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Function"
, "clang/lib/Sema/SemaType.cpp", 6371, __extension__ __PRETTY_FUNCTION__
));
    TL.setLocalRangeBegin(Chunk.Loc);
    TL.setLocalRangeEnd(Chunk.EndLoc);

    const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
    TL.setLParenLoc(FTI.getLParenLoc());
    TL.setRParenLoc(FTI.getRParenLoc());
    for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
      ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
      TL.setParam(tpi++, Param);
    }
    TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
  }
  void VisitParenTypeLoc(ParenTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Paren)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Paren
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Paren"
, "clang/lib/Sema/SemaType.cpp", 6385, __extension__ __PRETTY_FUNCTION__
));
    TL.setLParenLoc(Chunk.Loc);
    TL.setRParenLoc(Chunk.EndLoc);
  }
  void VisitPipeTypeLoc(PipeTypeLoc TL) {
    assert(Chunk.Kind == DeclaratorChunk::Pipe)(static_cast <bool> (Chunk.Kind == DeclaratorChunk::Pipe
) ? void (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pipe"
, "clang/lib/Sema/SemaType.cpp", 6390, __extension__ __PRETTY_FUNCTION__
));
    TL.setKWLoc(Chunk.Loc);
  }
  void VisitBitIntTypeLoc(BitIntTypeLoc TL) {
    TL.setNameLoc(Chunk.Loc);
  }
  void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
    TL.setExpansionLoc(Chunk.Loc);
  }
  void VisitVectorTypeLoc(VectorTypeLoc TL) { TL.setNameLoc(Chunk.Loc); }
  void VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL) {
    TL.setNameLoc(Chunk.Loc);
  }
  void VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
    TL.setNameLoc(Chunk.Loc);
  }
  void
  VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL) {
    TL.setNameLoc(Chunk.Loc);
  }

  void VisitTypeLoc(TypeLoc TL) {
    llvm_unreachable("unsupported TypeLoc kind in declarator!")::llvm::llvm_unreachable_internal("unsupported TypeLoc kind in declarator!"
, "clang/lib/Sema/SemaType.cpp", 6412);
  }
};
6415} // end anonymous namespace

6417static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
SourceLocation Loc;
switch (Chunk.Kind) {
case DeclaratorChunk::Function:
case DeclaratorChunk::Array:
case DeclaratorChunk::Paren:
case DeclaratorChunk::Pipe:
  llvm_unreachable("cannot be _Atomic qualified")::llvm::llvm_unreachable_internal("cannot be _Atomic qualified"
, "clang/lib/Sema/SemaType.cpp", 6424);

case DeclaratorChunk::Pointer:
  Loc = Chunk.Ptr.AtomicQualLoc;
  break;

case DeclaratorChunk::BlockPointer:
case DeclaratorChunk::Reference:
case DeclaratorChunk::MemberPointer:
  // FIXME: Provide a source location for the _Atomic keyword.
  break;
}

ATL.setKWLoc(Loc);
ATL.setParensRange(SourceRange());
6439}

6441static void
6442fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,
                               const ParsedAttributesView &Attrs) {
for (const ParsedAttr &AL : Attrs) {
  if (AL.getKind() == ParsedAttr::AT_AddressSpace) {
    DASTL.setAttrNameLoc(AL.getLoc());
    DASTL.setAttrExprOperand(AL.getArgAsExpr(0));
    DASTL.setAttrOperandParensRange(SourceRange());
    return;
  }
}

llvm_unreachable(::llvm::llvm_unreachable_internal("no address_space attribute found at the expected location!"
, "clang/lib/Sema/SemaType.cpp", 6454)
    "no address_space attribute found at the expected location!")::llvm::llvm_unreachable_internal("no address_space attribute found at the expected location!"
, "clang/lib/Sema/SemaType.cpp", 6454);
6455}

6457static void fillMatrixTypeLoc(MatrixTypeLoc MTL,
                            const ParsedAttributesView &Attrs) {
for (const ParsedAttr &AL : Attrs) {
  if (AL.getKind() == ParsedAttr::AT_MatrixType) {
    MTL.setAttrNameLoc(AL.getLoc());
    MTL.setAttrRowOperand(AL.getArgAsExpr(0));
    MTL.setAttrColumnOperand(AL.getArgAsExpr(1));
    MTL.setAttrOperandParensRange(SourceRange());
    return;
  }
}

llvm_unreachable("no matrix_type attribute found at the expected location!")::llvm::llvm_unreachable_internal("no matrix_type attribute found at the expected location!"
, "clang/lib/Sema/SemaType.cpp", 6469);
6470}

6472/// Create and instantiate a TypeSourceInfo with type source information.
6473///
6474/// \param T QualType referring to the type as written in source code.
6475///
6476/// \param ReturnTypeInfo For declarators whose return type does not show
6477/// up in the normal place in the declaration specifiers (such as a C++
6478/// conversion function), this pointer will refer to a type source information
6479/// for that return type.
6480static TypeSourceInfo *
6481GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
                             QualType T, TypeSourceInfo *ReturnTypeInfo) {
Sema &S = State.getSema();
Declarator &D = State.getDeclarator();

TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T);
UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();

// Handle parameter packs whose type is a pack expansion.
if (isa<PackExpansionType>(T)) {
  CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
  CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
}

for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
  // An AtomicTypeLoc might be produced by an atomic qualifier in this
  // declarator chunk.
  if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
    fillAtomicQualLoc(ATL, D.getTypeObject(i));
    CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
  }

  while (MacroQualifiedTypeLoc TL = CurrTL.getAs<MacroQualifiedTypeLoc>()) {
    TL.setExpansionLoc(
        State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
    CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
  }

  while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
    fillAttributedTypeLoc(TL, State);
    CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
  }

  while (DependentAddressSpaceTypeLoc TL =
             CurrTL.getAs<DependentAddressSpaceTypeLoc>()) {
    fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
    CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc();
  }

  if (MatrixTypeLoc TL = CurrTL.getAs<MatrixTypeLoc>())
    fillMatrixTypeLoc(TL, D.getTypeObject(i).getAttrs());

  // FIXME: Ordering here?
  while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
    CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();

  DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL);
  CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
}

// If we have different source information for the return type, use
// that.  This really only applies to C++ conversion functions.
if (ReturnTypeInfo) {
  TypeLoc TL = ReturnTypeInfo->getTypeLoc();
  assert(TL.getFullDataSize() == CurrTL.getFullDataSize())(static_cast <bool> (TL.getFullDataSize() == CurrTL.getFullDataSize
()) ? void (0) : __assert_fail ("TL.getFullDataSize() == CurrTL.getFullDataSize()"
, "clang/lib/Sema/SemaType.cpp", 6535, __extension__ __PRETTY_FUNCTION__
));
  memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
} else {
  TypeSpecLocFiller(S, S.Context, State, D.getDeclSpec()).Visit(CurrTL);
}

return TInfo;
6542}

6544/// Create a LocInfoType to hold the given QualType and TypeSourceInfo.
6545ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
// FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
// and Sema during declaration parsing. Try deallocating/caching them when
// it's appropriate, instead of allocating them and keeping them around.
LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
                                                     TypeAlignment);
new (LocT) LocInfoType(T, TInfo);
assert(LocT->getTypeClass() != T->getTypeClass() &&(static_cast <bool> (LocT->getTypeClass() != T->getTypeClass
() && "LocInfoType's TypeClass conflicts with an existing Type class"
) ? void (0) : __assert_fail ("LocT->getTypeClass() != T->getTypeClass() && \"LocInfoType's TypeClass conflicts with an existing Type class\""
, "clang/lib/Sema/SemaType.cpp", 6553, __extension__ __PRETTY_FUNCTION__
))
       "LocInfoType's TypeClass conflicts with an existing Type class")(static_cast <bool> (LocT->getTypeClass() != T->getTypeClass
() && "LocInfoType's TypeClass conflicts with an existing Type class"
) ? void (0) : __assert_fail ("LocT->getTypeClass() != T->getTypeClass() && \"LocInfoType's TypeClass conflicts with an existing Type class\""
, "clang/lib/Sema/SemaType.cpp", 6553, __extension__ __PRETTY_FUNCTION__
));
return ParsedType::make(QualType(LocT, 0));
6555}

6557void LocInfoType::getAsStringInternal(std::string &Str,
                                    const PrintingPolicy &Policy) const {
llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
 " was used directly instead of getting the QualType through"
 " GetTypeFromParser", "clang/lib/Sema/SemaType.cpp", 6561)
       " was used directly instead of getting the QualType through"::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
 " was used directly instead of getting the QualType through"
 " GetTypeFromParser", "clang/lib/Sema/SemaType.cpp", 6561)
       " GetTypeFromParser")::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
 " was used directly instead of getting the QualType through"
 " GetTypeFromParser", "clang/lib/Sema/SemaType.cpp", 6561);
6562}

6564TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
// C99 6.7.6: Type names have no identifier.  This is already validated by
// the parser.
assert(D.getIdentifier() == nullptr &&(static_cast <bool> (D.getIdentifier() == nullptr &&
 "Type name should have no identifier!") ? void (0) : __assert_fail
 ("D.getIdentifier() == nullptr && \"Type name should have no identifier!\""
, "clang/lib/Sema/SemaType.cpp", 6568, __extension__ __PRETTY_FUNCTION__
))
       "Type name should have no identifier!")(static_cast <bool> (D.getIdentifier() == nullptr &&
 "Type name should have no identifier!") ? void (0) : __assert_fail
 ("D.getIdentifier() == nullptr && \"Type name should have no identifier!\""
, "clang/lib/Sema/SemaType.cpp", 6568, __extension__ __PRETTY_FUNCTION__
));

TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType T = TInfo->getType();
if (D.isInvalidType())
  return true;

// Make sure there are no unused decl attributes on the declarator.
// We don't want to do this for ObjC parameters because we're going
// to apply them to the actual parameter declaration.
// Likewise, we don't want to do this for alias declarations, because
// we are actually going to build a declaration from this eventually.
if (D.getContext() != DeclaratorContext::ObjCParameter &&
    D.getContext() != DeclaratorContext::AliasDecl &&
    D.getContext() != DeclaratorContext::AliasTemplate)
  checkUnusedDeclAttributes(D);

if (getLangOpts().CPlusPlus) {
  // Check that there are no default arguments (C++ only).
  CheckExtraCXXDefaultArguments(D);
}

return CreateParsedType(T, TInfo);
6591}

6593ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
QualType T = Context.getObjCInstanceType();
TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
return CreateParsedType(T, TInfo);
6597}

6599//===----------------------------------------------------------------------===//
6600// Type Attribute Processing
6601//===----------------------------------------------------------------------===//

6603/// Build an AddressSpace index from a constant expression and diagnose any
6604/// errors related to invalid address_spaces. Returns true on successfully
6605/// building an AddressSpace index.
6606static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx,
                                 const Expr *AddrSpace,
                                 SourceLocation AttrLoc) {
if (!AddrSpace->isValueDependent()) {
  Optional<llvm::APSInt> OptAddrSpace =
      AddrSpace->getIntegerConstantExpr(S.Context);
  if (!OptAddrSpace) {
    S.Diag(AttrLoc, diag::err_attribute_argument_type)
        << "'address_space'" << AANT_ArgumentIntegerConstant
        << AddrSpace->getSourceRange();
    return false;
  }
  llvm::APSInt &addrSpace = *OptAddrSpace;

  // Bounds checking.
  if (addrSpace.isSigned()) {
    if (addrSpace.isNegative()) {
      S.Diag(AttrLoc, diag::err_attribute_address_space_negative)
          << AddrSpace->getSourceRange();
      return false;
    }
    addrSpace.setIsSigned(false);
  }

  llvm::APSInt max(addrSpace.getBitWidth());
  max =
      Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace;

  if (addrSpace > max) {
    S.Diag(AttrLoc, diag::err_attribute_address_space_too_high)
        << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange();
    return false;
  }

  ASIdx =
      getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue()));
  return true;
}

// Default value for DependentAddressSpaceTypes
ASIdx = LangAS::Default;
return true;
6648}

6650/// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression
6651/// is uninstantiated. If instantiated it will apply the appropriate address
6652/// space to the type. This function allows dependent template variables to be
6653/// used in conjunction with the address_space attribute
6654QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
                                   SourceLocation AttrLoc) {
if (!AddrSpace->isValueDependent()) {
  if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx,
                                          AttrLoc))
    return QualType();

  return Context.getAddrSpaceQualType(T, ASIdx);
}

// A check with similar intentions as checking if a type already has an
// address space except for on a dependent types, basically if the
// current type is already a DependentAddressSpaceType then its already
// lined up to have another address space on it and we can't have
// multiple address spaces on the one pointer indirection
if (T->getAs<DependentAddressSpaceType>()) {
  Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
  return QualType();
}

return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc);
6675}

6677QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
                                   SourceLocation AttrLoc) {
LangAS ASIdx;
if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc))
  return QualType();
return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc);
6683}

6685static void HandleBTFTypeTagAttribute(QualType &Type, const ParsedAttr &Attr,
                                    TypeProcessingState &State) {
Sema &S = State.getSema();

// Check the number of attribute arguments.
if (Attr.getNumArgs() != 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
      << Attr << 1;
  Attr.setInvalid();
  return;
}

// Ensure the argument is a string.
auto *StrLiteral = dyn_cast<StringLiteral>(Attr.getArgAsExpr(0));
if (!StrLiteral) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
      << Attr << AANT_ArgumentString;
  Attr.setInvalid();
  return;
}

ASTContext &Ctx = S.Context;
StringRef BTFTypeTag = StrLiteral->getString();
Type = State.getBTFTagAttributedType(
    ::new (Ctx) BTFTypeTagAttr(Ctx, Attr, BTFTypeTag), Type);
6710}

6712/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
6713/// specified type.  The attribute contains 1 argument, the id of the address
6714/// space for the type.
6715static void HandleAddressSpaceTypeAttribute(QualType &Type,
                                          const ParsedAttr &Attr,
                                          TypeProcessingState &State) {
Sema &S = State.getSema();

// ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
// qualified by an address-space qualifier."
if (Type->isFunctionType()) {
  S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
  Attr.setInvalid();
  return;
}

LangAS ASIdx;
if (Attr.getKind() == ParsedAttr::AT_AddressSpace) {

  // Check the attribute arguments.
  if (Attr.getNumArgs() != 1) {
    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
                                                                      << 1;
    Attr.setInvalid();
    return;
  }

  Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
  LangAS ASIdx;
  if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) {
    Attr.setInvalid();
    return;
  }

  ASTContext &Ctx = S.Context;
  auto *ASAttr =
      ::new (Ctx) AddressSpaceAttr(Ctx, Attr, static_cast<unsigned>(ASIdx));

  // If the expression is not value dependent (not templated), then we can
  // apply the address space qualifiers just to the equivalent type.
  // Otherwise, we make an AttributedType with the modified and equivalent
  // type the same, and wrap it in a DependentAddressSpaceType. When this
  // dependent type is resolved, the qualifier is added to the equivalent type
  // later.
  QualType T;
  if (!ASArgExpr->isValueDependent()) {
    QualType EquivType =
        S.BuildAddressSpaceAttr(Type, ASIdx, ASArgExpr, Attr.getLoc());
    if (EquivType.isNull()) {
      Attr.setInvalid();
      return;
    }
    T = State.getAttributedType(ASAttr, Type, EquivType);
  } else {
    T = State.getAttributedType(ASAttr, Type, Type);
    T = S.BuildAddressSpaceAttr(T, ASIdx, ASArgExpr, Attr.getLoc());
  }

  if (!T.isNull())
    Type = T;
  else
    Attr.setInvalid();
} else {
  // The keyword-based type attributes imply which address space to use.
  ASIdx = S.getLangOpts().SYCLIsDevice ? Attr.asSYCLLangAS()
                                       : Attr.asOpenCLLangAS();

  if (ASIdx == LangAS::Default)
    llvm_unreachable("Invalid address space")::llvm::llvm_unreachable_internal("Invalid address space", "clang/lib/Sema/SemaType.cpp"
, 6780);

  if (DiagnoseMultipleAddrSpaceAttributes(S, Type.getAddressSpace(), ASIdx,
                                          Attr.getLoc())) {
    Attr.setInvalid();
    return;
  }

  Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
}
6790}

6792/// handleObjCOwnershipTypeAttr - Process an objc_ownership
6793/// attribute on the specified type.
6794///
6795/// Returns 'true' if the attribute was handled.
6796static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
                                      ParsedAttr &attr, QualType &type) {
bool NonObjCPointer = false;

if (!type->isDependentType() && !type->isUndeducedType()) {
  if (const PointerType *ptr = type->getAs<PointerType>()) {
    QualType pointee = ptr->getPointeeType();
    if (pointee->isObjCRetainableType() || pointee->isPointerType())
      return false;
    // It is important not to lose the source info that there was an attribute
    // applied to non-objc pointer. We will create an attributed type but
    // its type will be the same as the original type.
    NonObjCPointer = true;
  } else if (!type->isObjCRetainableType()) {
    return false;
  }

  // Don't accept an ownership attribute in the declspec if it would
  // just be the return type of a block pointer.
  if (state.isProcessingDeclSpec()) {
    Declarator &D = state.getDeclarator();
    if (maybeMovePastReturnType(D, D.getNumTypeObjects(),
                                /*onlyBlockPointers=*/true))
      return false;
  }
}

Sema &S = state.getSema();
SourceLocation AttrLoc = attr.getLoc();
if (AttrLoc.isMacroID())
  AttrLoc =
      S.getSourceManager().getImmediateExpansionRange(AttrLoc).getBegin();

if (!attr.isArgIdent(0)) {
  S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr
                                                     << AANT_ArgumentString;
  attr.setInvalid();
  return true;
}

IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
Qualifiers::ObjCLifetime lifetime;
if (II->isStr("none"))
  lifetime = Qualifiers::OCL_ExplicitNone;
else if (II->isStr("strong"))
  lifetime = Qualifiers::OCL_Strong;
else if (II->isStr("weak"))
  lifetime = Qualifiers::OCL_Weak;
else if (II->isStr("autoreleasing"))
  lifetime = Qualifiers::OCL_Autoreleasing;
else {
  S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr << II;
  attr.setInvalid();
  return true;
}

// Just ignore lifetime attributes other than __weak and __unsafe_unretained
// outside of ARC mode.
if (!S.getLangOpts().ObjCAutoRefCount &&
    lifetime != Qualifiers::OCL_Weak &&
    lifetime != Qualifiers::OCL_ExplicitNone) {
  return true;
}

SplitQualType underlyingType = type.split();

// Check for redundant/conflicting ownership qualifiers.
if (Qualifiers::ObjCLifetime previousLifetime
      = type.getQualifiers().getObjCLifetime()) {
  // If it's written directly, that's an error.
  if (S.Context.hasDirectOwnershipQualifier(type)) {
    S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
      << type;
    return true;
  }

  // Otherwise, if the qualifiers actually conflict, pull sugar off
  // and remove the ObjCLifetime qualifiers.
  if (previousLifetime != lifetime) {
    // It's possible to have multiple local ObjCLifetime qualifiers. We
    // can't stop after we reach a type that is directly qualified.
    const Type *prevTy = nullptr;
    while (!prevTy || prevTy != underlyingType.Ty) {
      prevTy = underlyingType.Ty;
      underlyingType = underlyingType.getSingleStepDesugaredType();
    }
    underlyingType.Quals.removeObjCLifetime();
  }
}

underlyingType.Quals.addObjCLifetime(lifetime);

if (NonObjCPointer) {
  StringRef name = attr.getAttrName()->getName();
  switch (lifetime) {
  case Qualifiers::OCL_None:
  case Qualifiers::OCL_ExplicitNone:
    break;
  case Qualifiers::OCL_Strong: name = "__strong"; break;
  case Qualifiers::OCL_Weak: name = "__weak"; break;
  case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
  }
  S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
    << TDS_ObjCObjOrBlock << type;
}

// Don't actually add the __unsafe_unretained qualifier in non-ARC files,
// because having both 'T' and '__unsafe_unretained T' exist in the type
// system causes unfortunate widespread consistency problems.  (For example,
// they're not considered compatible types, and we mangle them identicially
// as template arguments.)  These problems are all individually fixable,
// but it's easier to just not add the qualifier and instead sniff it out
// in specific places using isObjCInertUnsafeUnretainedType().
//
// Doing this does means we miss some trivial consistency checks that
// would've triggered in ARC, but that's better than trying to solve all
// the coexistence problems with __unsafe_unretained.
if (!S.getLangOpts().ObjCAutoRefCount &&
    lifetime == Qualifiers::OCL_ExplicitNone) {
  type = state.getAttributedType(
      createSimpleAttr<ObjCInertUnsafeUnretainedAttr>(S.Context, attr),
      type, type);
  return true;
}

QualType origType = type;
if (!NonObjCPointer)
  type = S.Context.getQualifiedType(underlyingType);

// If we have a valid source location for the attribute, use an
// AttributedType instead.
if (AttrLoc.isValid()) {
  type = state.getAttributedType(::new (S.Context)
                                     ObjCOwnershipAttr(S.Context, attr, II),
                                 origType, type);
}

auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
                          unsigned diagnostic, QualType type) {
  if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
    S.DelayedDiagnostics.add(
        sema::DelayedDiagnostic::makeForbiddenType(
            S.getSourceManager().getExpansionLoc(loc),
            diagnostic, type, /*ignored*/ 0));
  } else {
    S.Diag(loc, diagnostic);
  }
};

// Sometimes, __weak isn't allowed.
if (lifetime == Qualifiers::OCL_Weak &&
    !S.getLangOpts().ObjCWeak && !NonObjCPointer) {

  // Use a specialized diagnostic if the runtime just doesn't support them.
  unsigned diagnostic =
    (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled
                                     : diag::err_arc_weak_no_runtime);

  // In any case, delay the diagnostic until we know what we're parsing.
  diagnoseOrDelay(S, AttrLoc, diagnostic, type);

  attr.setInvalid();
  return true;
}

// Forbid __weak for class objects marked as
// objc_arc_weak_reference_unavailable
if (lifetime == Qualifiers::OCL_Weak) {
  if (const ObjCObjectPointerType *ObjT =
        type->getAs<ObjCObjectPointerType>()) {
    if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
      if (Class->isArcWeakrefUnavailable()) {
        S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
        S.Diag(ObjT->getInterfaceDecl()->getLocation(),
               diag::note_class_declared);
      }
    }
  }
}

return true;
6977}

6979/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
6980/// attribute on the specified type.  Returns true to indicate that
6981/// the attribute was handled, false to indicate that the type does
6982/// not permit the attribute.
6983static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                               QualType &type) {
Sema &S = state.getSema();

// Delay if this isn't some kind of pointer.
if (!type->isPointerType() &&
    !type->isObjCObjectPointerType() &&
    !type->isBlockPointerType())
  return false;

if (type.getObjCGCAttr() != Qualifiers::GCNone) {
  S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
  attr.setInvalid();
  return true;
}

// Check the attribute arguments.
if (!attr.isArgIdent(0)) {
  S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
      << attr << AANT_ArgumentString;
  attr.setInvalid();
  return true;
}
Qualifiers::GC GCAttr;
if (attr.getNumArgs() > 1) {
  S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr
                                                                    << 1;
  attr.setInvalid();
  return true;
}

IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
if (II->isStr("weak"))
  GCAttr = Qualifiers::Weak;
else if (II->isStr("strong"))
  GCAttr = Qualifiers::Strong;
else {
  S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
      << attr << II;
  attr.setInvalid();
  return true;
}

QualType origType = type;
type = S.Context.getObjCGCQualType(origType, GCAttr);

// Make an attributed type to preserve the source information.
if (attr.getLoc().isValid())
  type = state.getAttributedType(
      ::new (S.Context) ObjCGCAttr(S.Context, attr, II), origType, type);

return true;
7035}

7037namespace {
/// A helper class to unwrap a type down to a function for the
/// purposes of applying attributes there.
///
/// Use:
///   FunctionTypeUnwrapper unwrapped(SemaRef, T);
///   if (unwrapped.isFunctionType()) {
///     const FunctionType *fn = unwrapped.get();
///     // change fn somehow
///     T = unwrapped.wrap(fn);
///   }
struct FunctionTypeUnwrapper {
  enum WrapKind {
    Desugar,
    Attributed,
    Parens,
    Array,
    Pointer,
    BlockPointer,
    Reference,
    MemberPointer,
    MacroQualified,
  };

  QualType Original;
  const FunctionType *Fn;
  SmallVector<unsigned char /*WrapKind*/, 8> Stack;

  FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
    while (true) {
      const Type *Ty = T.getTypePtr();
      if (isa<FunctionType>(Ty)) {
        Fn = cast<FunctionType>(Ty);
        return;
      } else if (isa<ParenType>(Ty)) {
        T = cast<ParenType>(Ty)->getInnerType();
        Stack.push_back(Parens);
      } else if (isa<ConstantArrayType>(Ty) || isa<VariableArrayType>(Ty) ||
                 isa<IncompleteArrayType>(Ty)) {
        T = cast<ArrayType>(Ty)->getElementType();
        Stack.push_back(Array);
      } else if (isa<PointerType>(Ty)) {
        T = cast<PointerType>(Ty)->getPointeeType();
        Stack.push_back(Pointer);
      } else if (isa<BlockPointerType>(Ty)) {
        T = cast<BlockPointerType>(Ty)->getPointeeType();
        Stack.push_back(BlockPointer);
      } else if (isa<MemberPointerType>(Ty)) {
        T = cast<MemberPointerType>(Ty)->getPointeeType();
        Stack.push_back(MemberPointer);
      } else if (isa<ReferenceType>(Ty)) {
        T = cast<ReferenceType>(Ty)->getPointeeType();
        Stack.push_back(Reference);
      } else if (isa<AttributedType>(Ty)) {
        T = cast<AttributedType>(Ty)->getEquivalentType();
        Stack.push_back(Attributed);
      } else if (isa<MacroQualifiedType>(Ty)) {
        T = cast<MacroQualifiedType>(Ty)->getUnderlyingType();
        Stack.push_back(MacroQualified);
      } else {
        const Type *DTy = Ty->getUnqualifiedDesugaredType();
        if (Ty == DTy) {
          Fn = nullptr;
          return;
        }

        T = QualType(DTy, 0);
        Stack.push_back(Desugar);
      }
    }
  }

  bool isFunctionType() const { return (Fn != nullptr); }
  const FunctionType *get() const { return Fn; }

  QualType wrap(Sema &S, const FunctionType *New) {
    // If T wasn't modified from the unwrapped type, do nothing.
    if (New == get()) return Original;

    Fn = New;
    return wrap(S.Context, Original, 0);
  }

private:
  QualType wrap(ASTContext &C, QualType Old, unsigned I) {
    if (I == Stack.size())
      return C.getQualifiedType(Fn, Old.getQualifiers());

    // Build up the inner type, applying the qualifiers from the old
    // type to the new type.
    SplitQualType SplitOld = Old.split();

    // As a special case, tail-recurse if there are no qualifiers.
    if (SplitOld.Quals.empty())
      return wrap(C, SplitOld.Ty, I);
    return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
  }

  QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
    if (I == Stack.size()) return QualType(Fn, 0);

    switch (static_cast<WrapKind>(Stack[I++])) {
    case Desugar:
      // This is the point at which we potentially lose source
      // information.
      return wrap(C, Old->getUnqualifiedDesugaredType(), I);

    case Attributed:
      return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I);

    case Parens: {
      QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
      return C.getParenType(New);
    }

    case MacroQualified:
      return wrap(C, cast<MacroQualifiedType>(Old)->getUnderlyingType(), I);

    case Array: {
      if (const auto *CAT = dyn_cast<ConstantArrayType>(Old)) {
        QualType New = wrap(C, CAT->getElementType(), I);
        return C.getConstantArrayType(New, CAT->getSize(), CAT->getSizeExpr(),
                                      CAT->getSizeModifier(),
                                      CAT->getIndexTypeCVRQualifiers());
      }

      if (const auto *VAT = dyn_cast<VariableArrayType>(Old)) {
        QualType New = wrap(C, VAT->getElementType(), I);
        return C.getVariableArrayType(
            New, VAT->getSizeExpr(), VAT->getSizeModifier(),
            VAT->getIndexTypeCVRQualifiers(), VAT->getBracketsRange());
      }

      const auto *IAT = cast<IncompleteArrayType>(Old);
      QualType New = wrap(C, IAT->getElementType(), I);
      return C.getIncompleteArrayType(New, IAT->getSizeModifier(),
                                      IAT->getIndexTypeCVRQualifiers());
    }

    case Pointer: {
      QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
      return C.getPointerType(New);
    }

    case BlockPointer: {
      QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
      return C.getBlockPointerType(New);
    }

    case MemberPointer: {
      const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
      QualType New = wrap(C, OldMPT->getPointeeType(), I);
      return C.getMemberPointerType(New, OldMPT->getClass());
    }

    case Reference: {
      const ReferenceType *OldRef = cast<ReferenceType>(Old);
      QualType New = wrap(C, OldRef->getPointeeType(), I);
      if (isa<LValueReferenceType>(OldRef))
        return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
      else
        return C.getRValueReferenceType(New);
    }
    }

    llvm_unreachable("unknown wrapping kind")::llvm::llvm_unreachable_internal("unknown wrapping kind", "clang/lib/Sema/SemaType.cpp"
, 7202);
  }
};
7205} // end anonymous namespace

7207static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
                                           ParsedAttr &PAttr, QualType &Type) {
Sema &S = State.getSema();

Attr *A;
switch (PAttr.getKind()) {
default: llvm_unreachable("Unknown attribute kind")::llvm::llvm_unreachable_internal("Unknown attribute kind", "clang/lib/Sema/SemaType.cpp"
, 7213);
case ParsedAttr::AT_Ptr32:
  A = createSimpleAttr<Ptr32Attr>(S.Context, PAttr);
  break;
case ParsedAttr::AT_Ptr64:
  A = createSimpleAttr<Ptr64Attr>(S.Context, PAttr);
  break;
case ParsedAttr::AT_SPtr:
  A = createSimpleAttr<SPtrAttr>(S.Context, PAttr);
  break;
case ParsedAttr::AT_UPtr:
  A = createSimpleAttr<UPtrAttr>(S.Context, PAttr);
  break;
}

std::bitset<attr::LastAttr> Attrs;
QualType Desugared = Type;
for (;;) {
  if (const TypedefType *TT = dyn_cast<TypedefType>(Desugared)) {
    Desugared = TT->desugar();
    continue;
  } else if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Desugared)) {
    Desugared = ET->desugar();
    continue;
  }
  const AttributedType *AT = dyn_cast<AttributedType>(Desugared);
  if (!AT)
    break;
  Attrs[AT->getAttrKind()] = true;
  Desugared = AT->getModifiedType();
}

// You cannot specify duplicate type attributes, so if the attribute has
// already been applied, flag it.
attr::Kind NewAttrKind = A->getKind();
if (Attrs[NewAttrKind]) {
  S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
  return true;
}
Attrs[NewAttrKind] = true;

// You cannot have both __sptr and __uptr on the same type, nor can you
// have __ptr32 and __ptr64.
if (Attrs[attr::Ptr32] && Attrs[attr::Ptr64]) {
  S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
      << "'__ptr32'"
      << "'__ptr64'";
  return true;
} else if (Attrs[attr::SPtr] && Attrs[attr::UPtr]) {
  S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
      << "'__sptr'"
      << "'__uptr'";
  return true;
}

// Check the raw (i.e., desugared) Canonical type to see if it
// is a pointer type.
if (!isa<PointerType>(Desugared)) {
  // Pointer type qualifiers can only operate on pointer types, but not
  // pointer-to-member types.
  if (Type->isMemberPointerType())
    S.Diag(PAttr.getLoc(), diag::err_attribute_no_member_pointers) << PAttr;
  else
    S.Diag(PAttr.getLoc(), diag::err_attribute_pointers_only) << PAttr << 0;
  return true;
}

// Add address space to type based on its attributes.
LangAS ASIdx = LangAS::Default;
uint64_t PtrWidth = S.Context.getTargetInfo().getPointerWidth(0);
if (PtrWidth == 32) {
  if (Attrs[attr::Ptr64])
    ASIdx = LangAS::ptr64;
  else if (Attrs[attr::UPtr])
    ASIdx = LangAS::ptr32_uptr;
} else if (PtrWidth == 64 && Attrs[attr::Ptr32]) {
  if (Attrs[attr::UPtr])
    ASIdx = LangAS::ptr32_uptr;
  else
    ASIdx = LangAS::ptr32_sptr;
}

QualType Pointee = Type->getPointeeType();
if (ASIdx != LangAS::Default)
  Pointee = S.Context.getAddrSpaceQualType(
      S.Context.removeAddrSpaceQualType(Pointee), ASIdx);
Type = State.getAttributedType(A, Type, S.Context.getPointerType(Pointee));
return false;
7301}

7303/// Map a nullability attribute kind to a nullability kind.
7304static NullabilityKind mapNullabilityAttrKind(ParsedAttr::Kind kind) {
switch (kind) {
case ParsedAttr::AT_TypeNonNull:
  return NullabilityKind::NonNull;

case ParsedAttr::AT_TypeNullable:
  return NullabilityKind::Nullable;

case ParsedAttr::AT_TypeNullableResult:
  return NullabilityKind::NullableResult;

case ParsedAttr::AT_TypeNullUnspecified:
  return NullabilityKind::Unspecified;

default:
  llvm_unreachable("not a nullability attribute kind")::llvm::llvm_unreachable_internal("not a nullability attribute kind"
, "clang/lib/Sema/SemaType.cpp", 7319);
}
7321}

7323/// Applies a nullability type specifier to the given type, if possible.
7324///
7325/// \param state The type processing state.
7326///
7327/// \param type The type to which the nullability specifier will be
7328/// added. On success, this type will be updated appropriately.
7329///
7330/// \param attr The attribute as written on the type.
7331///
7332/// \param allowOnArrayType Whether to accept nullability specifiers on an
7333/// array type (e.g., because it will decay to a pointer).
7334///
7335/// \returns true if a problem has been diagnosed, false on success.
7336static bool checkNullabilityTypeSpecifier(TypeProcessingState &state,
                                        QualType &type,
                                        ParsedAttr &attr,
                                        bool allowOnArrayType) {
Sema &S = state.getSema();

NullabilityKind nullability = mapNullabilityAttrKind(attr.getKind());
SourceLocation nullabilityLoc = attr.getLoc();
bool isContextSensitive = attr.isContextSensitiveKeywordAttribute();

recordNullabilitySeen(S, nullabilityLoc);

// Check for existing nullability attributes on the type.
QualType desugared = type;
while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) {
  // Check whether there is already a null
  if (auto existingNullability = attributed->getImmediateNullability()) {
    // Duplicated nullability.
    if (nullability == *existingNullability) {
      S.Diag(nullabilityLoc, diag::warn_nullability_duplicate)
        << DiagNullabilityKind(nullability, isContextSensitive)
        << FixItHint::CreateRemoval(nullabilityLoc);

      break;
    }

    // Conflicting nullability.
    S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
      << DiagNullabilityKind(nullability, isContextSensitive)
      << DiagNullabilityKind(*existingNullability, false);
    return true;
  }

  desugared = attributed->getModifiedType();
}

// If there is already a different nullability specifier, complain.
// This (unlike the code above) looks through typedefs that might
// have nullability specifiers on them, which means we cannot
// provide a useful Fix-It.
if (auto existingNullability = desugared->getNullability(S.Context)) {
  if (nullability != *existingNullability) {
    S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
      << DiagNullabilityKind(nullability, isContextSensitive)
      << DiagNullabilityKind(*existingNullability, false);

    // Try to find the typedef with the existing nullability specifier.
    if (auto typedefType = desugared->getAs<TypedefType>()) {
      TypedefNameDecl *typedefDecl = typedefType->getDecl();
      QualType underlyingType = typedefDecl->getUnderlyingType();
      if (auto typedefNullability
            = AttributedType::stripOuterNullability(underlyingType)) {
        if (*typedefNullability == *existingNullability) {
          S.Diag(typedefDecl->getLocation(), diag::note_nullability_here)
            << DiagNullabilityKind(*existingNullability, false);
        }
      }
    }

    return true;
  }
}

// If this definitely isn't a pointer type, reject the specifier.
if (!desugared->canHaveNullability() &&
    !(allowOnArrayType && desugared->isArrayType())) {
  S.Diag(nullabilityLoc, diag::err_nullability_nonpointer)
    << DiagNullabilityKind(nullability, isContextSensitive) << type;
  return true;
}

// For the context-sensitive keywords/Objective-C property
// attributes, require that the type be a single-level pointer.
if (isContextSensitive) {
  // Make sure that the pointee isn't itself a pointer type.
  const Type *pointeeType = nullptr;
  if (desugared->isArrayType())
    pointeeType = desugared->getArrayElementTypeNoTypeQual();
  else if (desugared->isAnyPointerType())
    pointeeType = desugared->getPointeeType().getTypePtr();

  if (pointeeType && (pointeeType->isAnyPointerType() ||
                      pointeeType->isObjCObjectPointerType() ||
                      pointeeType->isMemberPointerType())) {
    S.Diag(nullabilityLoc, diag::err_nullability_cs_multilevel)
      << DiagNullabilityKind(nullability, true)
      << type;
    S.Diag(nullabilityLoc, diag::note_nullability_type_specifier)
      << DiagNullabilityKind(nullability, false)
      << type
      << FixItHint::CreateReplacement(nullabilityLoc,
                                      getNullabilitySpelling(nullability));
    return true;
  }
}

// Form the attributed type.
type = state.getAttributedType(
    createNullabilityAttr(S.Context, attr, nullability), type, type);
return false;
7436}

7438/// Check the application of the Objective-C '__kindof' qualifier to
7439/// the given type.
7440static bool checkObjCKindOfType(TypeProcessingState &state, QualType &type,
                              ParsedAttr &attr) {
Sema &S = state.getSema();

if (isa<ObjCTypeParamType>(type)) {
  // Build the attributed type to record where __kindof occurred.
  type = state.getAttributedType(
      createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, type);
  return false;
}

// Find out if it's an Objective-C object or object pointer type;
const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>();
const ObjCObjectType *objType = ptrType ? ptrType->getObjectType()
                                        : type->getAs<ObjCObjectType>();

// If not, we can't apply __kindof.
if (!objType) {
  // FIXME: Handle dependent types that aren't yet object types.
  S.Diag(attr.getLoc(), diag::err_objc_kindof_nonobject)
    << type;
  return true;
}

// Rebuild the "equivalent" type, which pushes __kindof down into
// the object type.
// There is no need to apply kindof on an unqualified id type.
QualType equivType = S.Context.getObjCObjectType(
    objType->getBaseType(), objType->getTypeArgsAsWritten(),
    objType->getProtocols(),
    /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true);

// If we started with an object pointer type, rebuild it.
if (ptrType) {
  equivType = S.Context.getObjCObjectPointerType(equivType);
  if (auto nullability = type->getNullability(S.Context)) {
    // We create a nullability attribute from the __kindof attribute.
    // Make sure that will make sense.
    assert(attr.getAttributeSpellingListIndex() == 0 &&(static_cast <bool> (attr.getAttributeSpellingListIndex
() == 0 && "multiple spellings for __kindof?") ? void
 (0) : __assert_fail ("attr.getAttributeSpellingListIndex() == 0 && \"multiple spellings for __kindof?\""
, "clang/lib/Sema/SemaType.cpp", 7479, __extension__ __PRETTY_FUNCTION__
))
           "multiple spellings for __kindof?")(static_cast <bool> (attr.getAttributeSpellingListIndex
() == 0 && "multiple spellings for __kindof?") ? void
 (0) : __assert_fail ("attr.getAttributeSpellingListIndex() == 0 && \"multiple spellings for __kindof?\""
, "clang/lib/Sema/SemaType.cpp", 7479, __extension__ __PRETTY_FUNCTION__
));
    Attr *A = createNullabilityAttr(S.Context, attr, *nullability);
    A->setImplicit(true);
    equivType = state.getAttributedType(A, equivType, equivType);
  }
}

// Build the attributed type to record where __kindof occurred.
type = state.getAttributedType(
    createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, equivType);
return false;
7490}

7492/// Distribute a nullability type attribute that cannot be applied to
7493/// the type specifier to a pointer, block pointer, or member pointer
7494/// declarator, complaining if necessary.
7495///
7496/// \returns true if the nullability annotation was distributed, false
7497/// otherwise.
7498static bool distributeNullabilityTypeAttr(TypeProcessingState &state,
                                        QualType type, ParsedAttr &attr) {
Declarator &declarator = state.getDeclarator();

/// Attempt to move the attribute to the specified chunk.
auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool {
  // If there is already a nullability attribute there, don't add
  // one.
  if (hasNullabilityAttr(chunk.getAttrs()))
    return false;

  // Complain about the nullability qualifier being in the wrong
  // place.
  enum {
    PK_Pointer,
    PK_BlockPointer,
    PK_MemberPointer,
    PK_FunctionPointer,
    PK_MemberFunctionPointer,
  } pointerKind
    = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer
                                                           : PK_Pointer)
      : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer
      : inFunction? PK_MemberFunctionPointer : PK_MemberPointer;

  auto diag = state.getSema().Diag(attr.getLoc(),
                                   diag::warn_nullability_declspec)
    << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()),
                           attr.isContextSensitiveKeywordAttribute())
    << type
    << static_cast<unsigned>(pointerKind);

  // FIXME: MemberPointer chunks don't carry the location of the *.
  if (chunk.Kind != DeclaratorChunk::MemberPointer) {
    diag << FixItHint::CreateRemoval(attr.getLoc())
         << FixItHint::CreateInsertion(
                state.getSema().getPreprocessor().getLocForEndOfToken(
                    chunk.Loc),
                " " + attr.getAttrName()->getName().str() + " ");
  }

  moveAttrFromListToList(attr, state.getCurrentAttributes(),
                         chunk.getAttrs());
  return true;
};

// Move it to the outermost pointer, member pointer, or block
// pointer declarator.
for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
  DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
  switch (chunk.Kind) {
  case DeclaratorChunk::Pointer:
  case DeclaratorChunk::BlockPointer:
  case DeclaratorChunk::MemberPointer:
    return moveToChunk(chunk, false);

  case DeclaratorChunk::Paren:
  case DeclaratorChunk::Array:
    continue;

  case DeclaratorChunk::Function:
    // Try to move past the return type to a function/block/member
    // function pointer.
    if (DeclaratorChunk *dest = maybeMovePastReturnType(
                                  declarator, i,
                                  /*onlyBlockPointers=*/false)) {
      return moveToChunk(*dest, true);
    }

    return false;

  // Don't walk through these.
  case DeclaratorChunk::Reference:
  case DeclaratorChunk::Pipe:
    return false;
  }
}

return false;
7577}

7579static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) {
assert(!Attr.isInvalid())(static_cast <bool> (!Attr.isInvalid()) ? void (0) : __assert_fail
 ("!Attr.isInvalid()", "clang/lib/Sema/SemaType.cpp", 7580, __extension__
 __PRETTY_FUNCTION__));
switch (Attr.getKind()) {
default:
  llvm_unreachable("not a calling convention attribute")::llvm::llvm_unreachable_internal("not a calling convention attribute"
, "clang/lib/Sema/SemaType.cpp", 7583);
case ParsedAttr::AT_CDecl:
  return createSimpleAttr<CDeclAttr>(Ctx, Attr);
case ParsedAttr::AT_FastCall:
  return createSimpleAttr<FastCallAttr>(Ctx, Attr);
case ParsedAttr::AT_StdCall:
  return createSimpleAttr<StdCallAttr>(Ctx, Attr);
case ParsedAttr::AT_ThisCall:
  return createSimpleAttr<ThisCallAttr>(Ctx, Attr);
case ParsedAttr::AT_RegCall:
  return createSimpleAttr<RegCallAttr>(Ctx, Attr);
case ParsedAttr::AT_Pascal:
  return createSimpleAttr<PascalAttr>(Ctx, Attr);
case ParsedAttr::AT_SwiftCall:
  return createSimpleAttr<SwiftCallAttr>(Ctx, Attr);
case ParsedAttr::AT_SwiftAsyncCall:
  return createSimpleAttr<SwiftAsyncCallAttr>(Ctx, Attr);
case ParsedAttr::AT_VectorCall:
  return createSimpleAttr<VectorCallAttr>(Ctx, Attr);
case ParsedAttr::AT_AArch64VectorPcs:
  return createSimpleAttr<AArch64VectorPcsAttr>(Ctx, Attr);
case ParsedAttr::AT_AArch64SVEPcs:
  return createSimpleAttr<AArch64SVEPcsAttr>(Ctx, Attr);
case ParsedAttr::AT_AMDGPUKernelCall:
  return createSimpleAttr<AMDGPUKernelCallAttr>(Ctx, Attr);
case ParsedAttr::AT_Pcs: {
  // The attribute may have had a fixit applied where we treated an
  // identifier as a string literal.  The contents of the string are valid,
  // but the form may not be.
  StringRef Str;
  if (Attr.isArgExpr(0))
    Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
  else
    Str = Attr.getArgAsIdent(0)->Ident->getName();
  PcsAttr::PCSType Type;
  if (!PcsAttr::ConvertStrToPCSType(Str, Type))
    llvm_unreachable("already validated the attribute")::llvm::llvm_unreachable_internal("already validated the attribute"
, "clang/lib/Sema/SemaType.cpp", 7619);
  return ::new (Ctx) PcsAttr(Ctx, Attr, Type);
}
case ParsedAttr::AT_IntelOclBicc:
  return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr);
case ParsedAttr::AT_MSABI:
  return createSimpleAttr<MSABIAttr>(Ctx, Attr);
case ParsedAttr::AT_SysVABI:
  return createSimpleAttr<SysVABIAttr>(Ctx, Attr);
case ParsedAttr::AT_PreserveMost:
  return createSimpleAttr<PreserveMostAttr>(Ctx, Attr);
case ParsedAttr::AT_PreserveAll:
  return createSimpleAttr<PreserveAllAttr>(Ctx, Attr);
}
llvm_unreachable("unexpected attribute kind!")::llvm::llvm_unreachable_internal("unexpected attribute kind!"
, "clang/lib/Sema/SemaType.cpp", 7633);
7634}

7636/// Process an individual function attribute.  Returns true to
7637/// indicate that the attribute was handled, false if it wasn't.
7638static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                                 QualType &type) {
Sema &S = state.getSema();

FunctionTypeUnwrapper unwrapped(S, type);

if (attr.getKind() == ParsedAttr::AT_NoReturn) {
  if (S.CheckAttrNoArgs(attr))
    return true;

  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  // Otherwise we can process right away.
  FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
  type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  return true;
}

if (attr.getKind() == ParsedAttr::AT_CmseNSCall) {
  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  // Ignore if we don't have CMSE enabled.
  if (!S.getLangOpts().Cmse) {
    S.Diag(attr.getLoc(), diag::warn_attribute_ignored) << attr;
    attr.setInvalid();
    return true;
  }

  // Otherwise we can process right away.
  FunctionType::ExtInfo EI =
      unwrapped.get()->getExtInfo().withCmseNSCall(true);
  type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  return true;
}

// ns_returns_retained is not always a type attribute, but if we got
// here, we're treating it as one right now.
if (attr.getKind() == ParsedAttr::AT_NSReturnsRetained) {
  if (attr.getNumArgs()) return true;

  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  // Check whether the return type is reasonable.
  if (S.checkNSReturnsRetainedReturnType(attr.getLoc(),
                                         unwrapped.get()->getReturnType()))
    return true;

  // Only actually change the underlying type in ARC builds.
  QualType origType = type;
  if (state.getSema().getLangOpts().ObjCAutoRefCount) {
    FunctionType::ExtInfo EI
      = unwrapped.get()->getExtInfo().withProducesResult(true);
    type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  }
  type = state.getAttributedType(
      createSimpleAttr<NSReturnsRetainedAttr>(S.Context, attr),
      origType, type);
  return true;
}

if (attr.getKind() == ParsedAttr::AT_AnyX86NoCallerSavedRegisters) {
  if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
    return true;

  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  FunctionType::ExtInfo EI =
      unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true);
  type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  return true;
}

if (attr.getKind() == ParsedAttr::AT_AnyX86NoCfCheck) {
  if (!S.getLangOpts().CFProtectionBranch) {
    S.Diag(attr.getLoc(), diag::warn_nocf_check_attribute_ignored);
    attr.setInvalid();
    return true;
  }

  if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
    return true;

  // If this is not a function type, warning will be asserted by subject
  // check.
  if (!unwrapped.isFunctionType())
    return true;

  FunctionType::ExtInfo EI =
    unwrapped.get()->getExtInfo().withNoCfCheck(true);
  type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  return true;
}

if (attr.getKind() == ParsedAttr::AT_Regparm) {
  unsigned value;
  if (S.CheckRegparmAttr(attr, value))
    return true;

  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  // Diagnose regparm with fastcall.
  const FunctionType *fn = unwrapped.get();
  CallingConv CC = fn->getCallConv();
  if (CC == CC_X86FastCall) {
    S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
      << FunctionType::getNameForCallConv(CC)
      << "regparm";
    attr.setInvalid();
    return true;
  }

  FunctionType::ExtInfo EI =
    unwrapped.get()->getExtInfo().withRegParm(value);
  type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
  return true;
}

if (attr.getKind() == ParsedAttr::AT_NoThrow) {
  // Delay if this is not a function type.
  if (!unwrapped.isFunctionType())
    return false;

  if (S.CheckAttrNoArgs(attr)) {
    attr.setInvalid();
    return true;
  }

  // Otherwise we can process right away.
  auto *Proto = unwrapped.get()->castAs<FunctionProtoType>();

  // MSVC ignores nothrow if it is in conflict with an explicit exception
  // specification.
  if (Proto->hasExceptionSpec()) {
    switch (Proto->getExceptionSpecType()) {
    case EST_None:
      llvm_unreachable("This doesn't have an exception spec!")::llvm::llvm_unreachable_internal("This doesn't have an exception spec!"
, "clang/lib/Sema/SemaType.cpp", 7783);

    case EST_DynamicNone:
    case EST_BasicNoexcept:
    case EST_NoexceptTrue:
    case EST_NoThrow:
      // Exception spec doesn't conflict with nothrow, so don't warn.
      [[fallthrough]];
    case EST_Unparsed:
    case EST_Uninstantiated:
    case EST_DependentNoexcept:
    case EST_Unevaluated:
      // We don't have enough information to properly determine if there is a
      // conflict, so suppress the warning.
      break;
    case EST_Dynamic:
    case EST_MSAny:
    case EST_NoexceptFalse:
      S.Diag(attr.getLoc(), diag::warn_nothrow_attribute_ignored);
      break;
    }
    return true;
  }

  type = unwrapped.wrap(
      S, S.Context
             .getFunctionTypeWithExceptionSpec(
                 QualType{Proto, 0},
                 FunctionProtoType::ExceptionSpecInfo{EST_NoThrow})
             ->getAs<FunctionType>());
  return true;
}

// Delay if the type didn't work out to a function.
if (!unwrapped.isFunctionType()) return false;

// Otherwise, a calling convention.
CallingConv CC;
if (S.CheckCallingConvAttr(attr, CC))
  return true;

const FunctionType *fn = unwrapped.get();
CallingConv CCOld = fn->getCallConv();
Attr *CCAttr = getCCTypeAttr(S.Context, attr);

if (CCOld != CC) {
  // Error out on when there's already an attribute on the type
  // and the CCs don't match.
  if (S.getCallingConvAttributedType(type)) {
    S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
      << FunctionType::getNameForCallConv(CC)
      << FunctionType::getNameForCallConv(CCOld);
    attr.setInvalid();
    return true;
  }
}

// Diagnose use of variadic functions with calling conventions that
// don't support them (e.g. because they're callee-cleanup).
// We delay warning about this on unprototyped function declarations
// until after redeclaration checking, just in case we pick up a
// prototype that way.  And apparently we also "delay" warning about
// unprototyped function types in general, despite not necessarily having
// much ability to diagnose it later.
if (!supportsVariadicCall(CC)) {
  const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
  if (FnP && FnP->isVariadic()) {
    // stdcall and fastcall are ignored with a warning for GCC and MS
    // compatibility.
    if (CC == CC_X86StdCall || CC == CC_X86FastCall)
      return S.Diag(attr.getLoc(), diag::warn_cconv_unsupported)
             << FunctionType::getNameForCallConv(CC)
             << (int)Sema::CallingConventionIgnoredReason::VariadicFunction;

    attr.setInvalid();
    return S.Diag(attr.getLoc(), diag::err_cconv_varargs)
           << FunctionType::getNameForCallConv(CC);
  }
}

// Also diagnose fastcall with regparm.
if (CC == CC_X86FastCall && fn->getHasRegParm()) {
  S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
      << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall);
  attr.setInvalid();
  return true;
}

// Modify the CC from the wrapped function type, wrap it all back, and then
// wrap the whole thing in an AttributedType as written.  The modified type
// might have a different CC if we ignored the attribute.
QualType Equivalent;
if (CCOld == CC) {
  Equivalent = type;
} else {
  auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
  Equivalent =
    unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
}
type = state.getAttributedType(CCAttr, type, Equivalent);
return true;
7884}

7886bool Sema::hasExplicitCallingConv(QualType T) {
const AttributedType *AT;

// Stop if we'd be stripping off a typedef sugar node to reach the
// AttributedType.
while ((AT = T->getAs<AttributedType>()) &&
       AT->getAs<TypedefType>() == T->getAs<TypedefType>()) {
  if (AT->isCallingConv())
    return true;
  T = AT->getModifiedType();
}
return false;
7898}

7900void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
                                SourceLocation Loc) {
FunctionTypeUnwrapper Unwrapped(*this, T);
const FunctionType *FT = Unwrapped.get();
bool IsVariadic = (isa<FunctionProtoType>(FT) &&
                   cast<FunctionProtoType>(FT)->isVariadic());
CallingConv CurCC = FT->getCallConv();
CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic);

if (CurCC == ToCC)
  return;

// MS compiler ignores explicit calling convention attributes on structors. We
// should do the same.
if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) {
  // Issue a warning on ignored calling convention -- except of __stdcall.
  // Again, this is what MS compiler does.
  if (CurCC != CC_X86StdCall)
    Diag(Loc, diag::warn_cconv_unsupported)
        << FunctionType::getNameForCallConv(CurCC)
        << (int)Sema::CallingConventionIgnoredReason::ConstructorDestructor;
// Default adjustment.
} else {
  // Only adjust types with the default convention.  For example, on Windows
  // we should adjust a __cdecl type to __thiscall for instance methods, and a
  // __thiscall type to __cdecl for static methods.
  CallingConv DefaultCC =
      Context.getDefaultCallingConvention(IsVariadic, IsStatic);

  if (CurCC != DefaultCC || DefaultCC == ToCC)
    return;

  if (hasExplicitCallingConv(T))
    return;
}

FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
QualType Wrapped = Unwrapped.wrap(*this, FT);
T = Context.getAdjustedType(T, Wrapped);
7939}

7941/// HandleVectorSizeAttribute - this attribute is only applicable to integral
7942/// and float scalars, although arrays, pointers, and function return values are
7943/// allowed in conjunction with this construct. Aggregates with this attribute
7944/// are invalid, even if they are of the same size as a corresponding scalar.
7945/// The raw attribute should contain precisely 1 argument, the vector size for
7946/// the variable, measured in bytes. If curType and rawAttr are well formed,
7947/// this routine will return a new vector type.
7948static void HandleVectorSizeAttr(QualType &CurType, const ParsedAttr &Attr,
                               Sema &S) {
// Check the attribute arguments.
if (Attr.getNumArgs() != 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
                                                                    << 1;
  Attr.setInvalid();
  return;
}

Expr *SizeExpr = Attr.getArgAsExpr(0);
QualType T = S.BuildVectorType(CurType, SizeExpr, Attr.getLoc());
if (!T.isNull())
  CurType = T;
else
  Attr.setInvalid();
7964}

7966/// Process the OpenCL-like ext_vector_type attribute when it occurs on
7967/// a type.
7968static void HandleExtVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
                                  Sema &S) {
// check the attribute arguments.
if (Attr.getNumArgs() != 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
                                                                    << 1;
  return;
}

Expr *SizeExpr = Attr.getArgAsExpr(0);
QualType T = S.BuildExtVectorType(CurType, SizeExpr, Attr.getLoc());
if (!T.isNull())
  CurType = T;
7981}

7983static bool isPermittedNeonBaseType(QualType &Ty,
                                  VectorType::VectorKind VecKind, Sema &S) {
const BuiltinType *BTy = Ty->getAs<BuiltinType>();
if (!BTy)
  return false;

llvm::Triple Triple = S.Context.getTargetInfo().getTriple();

// Signed poly is mathematically wrong, but has been baked into some ABIs by
// now.
bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
                      Triple.getArch() == llvm::Triple::aarch64_32 ||
                      Triple.getArch() == llvm::Triple::aarch64_be;
if (VecKind == VectorType::NeonPolyVector) {
  if (IsPolyUnsigned) {
    // AArch64 polynomial vectors are unsigned.
    return BTy->getKind() == BuiltinType::UChar ||
           BTy->getKind() == BuiltinType::UShort ||
           BTy->getKind() == BuiltinType::ULong ||
           BTy->getKind() == BuiltinType::ULongLong;
  } else {
    // AArch32 polynomial vectors are signed.
    return BTy->getKind() == BuiltinType::SChar ||
           BTy->getKind() == BuiltinType::Short ||
           BTy->getKind() == BuiltinType::LongLong;
  }
}

// Non-polynomial vector types: the usual suspects are allowed, as well as
// float64_t on AArch64.
if ((Triple.isArch64Bit() || Triple.getArch() == llvm::Triple::aarch64_32) &&
    BTy->getKind() == BuiltinType::Double)
  return true;

return BTy->getKind() == BuiltinType::SChar ||
       BTy->getKind() == BuiltinType::UChar ||
       BTy->getKind() == BuiltinType::Short ||
       BTy->getKind() == BuiltinType::UShort ||
       BTy->getKind() == BuiltinType::Int ||
       BTy->getKind() == BuiltinType::UInt ||
       BTy->getKind() == BuiltinType::Long ||
       BTy->getKind() == BuiltinType::ULong ||
       BTy->getKind() == BuiltinType::LongLong ||
       BTy->getKind() == BuiltinType::ULongLong ||
       BTy->getKind() == BuiltinType::Float ||
       BTy->getKind() == BuiltinType::Half ||
       BTy->getKind() == BuiltinType::BFloat16;
8030}

8032static bool verifyValidIntegerConstantExpr(Sema &S, const ParsedAttr &Attr,
                                         llvm::APSInt &Result) {
const auto *AttrExpr = Attr.getArgAsExpr(0);
if (!AttrExpr->isTypeDependent()) {
  if (Optional<llvm::APSInt> Res =
          AttrExpr->getIntegerConstantExpr(S.Context)) {
    Result = *Res;
    return true;
  }
}
S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
    << Attr << AANT_ArgumentIntegerConstant << AttrExpr->getSourceRange();
Attr.setInvalid();
return false;
8046}

8048/// HandleNeonVectorTypeAttr - The "neon_vector_type" and
8049/// "neon_polyvector_type" attributes are used to create vector types that
8050/// are mangled according to ARM's ABI.  Otherwise, these types are identical
8051/// to those created with the "vector_size" attribute.  Unlike "vector_size"
8052/// the argument to these Neon attributes is the number of vector elements,
8053/// not the vector size in bytes.  The vector width and element type must
8054/// match one of the standard Neon vector types.
8055static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
                                   Sema &S, VectorType::VectorKind VecKind) {
// Target must have NEON (or MVE, whose vectors are similar enough
// not to need a separate attribute)
if (!S.Context.getTargetInfo().hasFeature("neon") &&
    !S.Context.getTargetInfo().hasFeature("mve")) {
  S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
      << Attr << "'neon' or 'mve'";
  Attr.setInvalid();
  return;
}
// Check the attribute arguments.
if (Attr.getNumArgs() != 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
                                                                    << 1;
  Attr.setInvalid();
  return;
}
// The number of elements must be an ICE.
llvm::APSInt numEltsInt(32);
if (!verifyValidIntegerConstantExpr(S, Attr, numEltsInt))
  return;

// Only certain element types are supported for Neon vectors.
if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
  Attr.setInvalid();
  return;
}

// The total size of the vector must be 64 or 128 bits.
unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
unsigned vecSize = typeSize * numElts;
if (vecSize != 64 && vecSize != 128) {
  S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
  Attr.setInvalid();
  return;
}

CurType = S.Context.getVectorType(CurType, numElts, VecKind);
8096}

8098/// HandleArmSveVectorBitsTypeAttr - The "arm_sve_vector_bits" attribute is
8099/// used to create fixed-length versions of sizeless SVE types defined by
8100/// the ACLE, such as svint32_t and svbool_t.
8101static void HandleArmSveVectorBitsTypeAttr(QualType &CurType, ParsedAttr &Attr,
                                         Sema &S) {
// Target must have SVE.
if (!S.Context.getTargetInfo().hasFeature("sve")) {
  S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr << "'sve'";
  Attr.setInvalid();
  return;
}

// Attribute is unsupported if '-msve-vector-bits=<bits>' isn't specified, or
// if <bits>+ syntax is used.
if (!S.getLangOpts().VScaleMin ||
    S.getLangOpts().VScaleMin != S.getLangOpts().VScaleMax) {
  S.Diag(Attr.getLoc(), diag::err_attribute_arm_feature_sve_bits_unsupported)
      << Attr;
  Attr.setInvalid();
  return;
}

// Check the attribute arguments.
if (Attr.getNumArgs() != 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
      << Attr << 1;
  Attr.setInvalid();
  return;
}

// The vector size must be an integer constant expression.
llvm::APSInt SveVectorSizeInBits(32);
if (!verifyValidIntegerConstantExpr(S, Attr, SveVectorSizeInBits))
  return;

unsigned VecSize = static_cast<unsigned>(SveVectorSizeInBits.getZExtValue());

// The attribute vector size must match -msve-vector-bits.
if (VecSize != S.getLangOpts().VScaleMin * 128) {
  S.Diag(Attr.getLoc(), diag::err_attribute_bad_sve_vector_size)
      << VecSize << S.getLangOpts().VScaleMin * 128;
  Attr.setInvalid();
  return;
}

// Attribute can only be attached to a single SVE vector or predicate type.
if (!CurType->isVLSTBuiltinType()) {
  S.Diag(Attr.getLoc(), diag::err_attribute_invalid_sve_type)
      << Attr << CurType;
  Attr.setInvalid();
  return;
}

const auto *BT = CurType->castAs<BuiltinType>();

QualType EltType = CurType->getSveEltType(S.Context);
unsigned TypeSize = S.Context.getTypeSize(EltType);
VectorType::VectorKind VecKind = VectorType::SveFixedLengthDataVector;
if (BT->getKind() == BuiltinType::SveBool) {
  // Predicates are represented as i8.
  VecSize /= S.Context.getCharWidth() * S.Context.getCharWidth();
  VecKind = VectorType::SveFixedLengthPredicateVector;
} else
  VecSize /= TypeSize;
CurType = S.Context.getVectorType(EltType, VecSize, VecKind);
8163}

8165static void HandleArmMveStrictPolymorphismAttr(TypeProcessingState &State,
                                             QualType &CurType,
                                             ParsedAttr &Attr) {
const VectorType *VT = dyn_cast<VectorType>(CurType);
if (!VT || VT->getVectorKind() != VectorType::NeonVector) {
  State.getSema().Diag(Attr.getLoc(),
                       diag::err_attribute_arm_mve_polymorphism);
  Attr.setInvalid();
  return;
}

CurType =
    State.getAttributedType(createSimpleAttr<ArmMveStrictPolymorphismAttr>(
                                State.getSema().Context, Attr),
                            CurType, CurType);
8180}

8182/// Handle OpenCL Access Qualifier Attribute.
8183static void HandleOpenCLAccessAttr(QualType &CurType, const ParsedAttr &Attr,
                                 Sema &S) {
// OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type.
if (!(CurType->isImageType() || CurType->isPipeType())) {
  S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier);
  Attr.setInvalid();
  return;
}

if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) {
  QualType BaseTy = TypedefTy->desugar();

  std::string PrevAccessQual;
  if (BaseTy->isPipeType()) {
    if (TypedefTy->getDecl()->hasAttr<OpenCLAccessAttr>()) {
      OpenCLAccessAttr *Attr =
          TypedefTy->getDecl()->getAttr<OpenCLAccessAttr>();
      PrevAccessQual = Attr->getSpelling();
    } else {
      PrevAccessQual = "read_only";
    }
  } else if (const BuiltinType* ImgType = BaseTy->getAs<BuiltinType>()) {

    switch (ImgType->getKind()) {
      #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
    case BuiltinType::Id:                                          \
      PrevAccessQual = #Access;                                    \
      break;
      #include "clang/Basic/OpenCLImageTypes.def"
    default:
      llvm_unreachable("Unable to find corresponding image type.")::llvm::llvm_unreachable_internal("Unable to find corresponding image type."
, "clang/lib/Sema/SemaType.cpp", 8213);
    }
  } else {
    llvm_unreachable("unexpected type")::llvm::llvm_unreachable_internal("unexpected type", "clang/lib/Sema/SemaType.cpp"
, 8216);
  }
  StringRef AttrName = Attr.getAttrName()->getName();
  if (PrevAccessQual == AttrName.ltrim("_")) {
    // Duplicated qualifiers
    S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec)
       << AttrName << Attr.getRange();
  } else {
    // Contradicting qualifiers
    S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
  }

  S.Diag(TypedefTy->getDecl()->getBeginLoc(),
         diag::note_opencl_typedef_access_qualifier) << PrevAccessQual;
} else if (CurType->isPipeType()) {
  if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) {
    QualType ElemType = CurType->castAs<PipeType>()->getElementType();
    CurType = S.Context.getWritePipeType(ElemType);
  }
}
8236}

8238/// HandleMatrixTypeAttr - "matrix_type" attribute, like ext_vector_type
8239static void HandleMatrixTypeAttr(QualType &CurType, const ParsedAttr &Attr,
                               Sema &S) {
if (!S.getLangOpts().MatrixTypes) {
  S.Diag(Attr.getLoc(), diag::err_builtin_matrix_disabled);
  return;
}

if (Attr.getNumArgs() != 2) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
      << Attr << 2;
  return;
}

Expr *RowsExpr = Attr.getArgAsExpr(0);
Expr *ColsExpr = Attr.getArgAsExpr(1);
QualType T = S.BuildMatrixType(CurType, RowsExpr, ColsExpr, Attr.getLoc());
if (!T.isNull())
  CurType = T;
8257}

8259static void HandleAnnotateTypeAttr(TypeProcessingState &State,
                                 QualType &CurType, const ParsedAttr &PA) {
Sema &S = State.getSema();

if (PA.getNumArgs() < 1) {
  S.Diag(PA.getLoc(), diag::err_attribute_too_few_arguments) << PA << 1;
  return;
}

// Make sure that there is a string literal as the annotation's first
// argument.
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(PA, 0, Str))
  return;

llvm::SmallVector<Expr *, 4> Args;
Args.reserve(PA.getNumArgs() - 1);
for (unsigned Idx = 1; Idx < PA.getNumArgs(); Idx++) {
  assert(!PA.isArgIdent(Idx))(static_cast <bool> (!PA.isArgIdent(Idx)) ? void (0) : __assert_fail
 ("!PA.isArgIdent(Idx)", "clang/lib/Sema/SemaType.cpp", 8277,
 __extension__ __PRETTY_FUNCTION__));
  Args.push_back(PA.getArgAsExpr(Idx));
}
if (!S.ConstantFoldAttrArgs(PA, Args))
  return;
auto *AnnotateTypeAttr =
    AnnotateTypeAttr::Create(S.Context, Str, Args.data(), Args.size(), PA);
CurType = State.getAttributedType(AnnotateTypeAttr, CurType, CurType);
8285}

8287static void HandleLifetimeBoundAttr(TypeProcessingState &State,
                                  QualType &CurType,
                                  ParsedAttr &Attr) {
if (State.getDeclarator().isDeclarationOfFunction()) {
  CurType = State.getAttributedType(
      createSimpleAttr<LifetimeBoundAttr>(State.getSema().Context, Attr),
      CurType, CurType);
}
8295}

8297static void processTypeAttrs(TypeProcessingState &state, QualType &type,
                           TypeAttrLocation TAL,
                           const ParsedAttributesView &attrs) {

state.setParsedNoDeref(false);
if (attrs.empty())
  return;

// Scan through and apply attributes to this type where it makes sense.  Some
// attributes (such as __address_space__, __vector_size__, etc) apply to the
// type, but others can be present in the type specifiers even though they
// apply to the decl.  Here we apply type attributes and ignore the rest.

// This loop modifies the list pretty frequently, but we still need to make
// sure we visit every element once. Copy the attributes list, and iterate
// over that.
ParsedAttributesView AttrsCopy{attrs};
for (ParsedAttr &attr : AttrsCopy) {

  // Skip attributes that were marked to be invalid.
  if (attr.isInvalid())
    continue;

  if (attr.isStandardAttributeSyntax()) {
    // [[gnu::...]] attributes are treated as declaration attributes, so may
    // not appertain to a DeclaratorChunk. If we handle them as type
    // attributes, accept them in that position and diagnose the GCC
    // incompatibility.
    if (attr.isGNUScope()) {
      bool IsTypeAttr = attr.isTypeAttr();
      if (TAL == TAL_DeclChunk) {
        state.getSema().Diag(attr.getLoc(),
                             IsTypeAttr
                                 ? diag::warn_gcc_ignores_type_attr
                                 : diag::warn_cxx11_gnu_attribute_on_type)
            << attr;
        if (!IsTypeAttr)
          continue;
      }
    } else if (TAL != TAL_DeclSpec && TAL != TAL_DeclChunk &&
               !attr.isTypeAttr()) {
      // Otherwise, only consider type processing for a C++11 attribute if
      // - it has actually been applied to a type (decl-specifier-seq or
      //   declarator chunk), or
      // - it is a type attribute, irrespective of where it was applied (so
      //   that we can support the legacy behavior of some type attributes
      //   that can be applied to the declaration name).
      continue;
    }
  }

  // If this is an attribute we can handle, do so now,
  // otherwise, add it to the FnAttrs list for rechaining.
  switch (attr.getKind()) {
  default:
    // A [[]] attribute on a declarator chunk must appertain to a type.
    if (attr.isStandardAttributeSyntax() && TAL == TAL_DeclChunk) {
      state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
          << attr;
      attr.setUsedAsTypeAttr();
    }
    break;

  case ParsedAttr::UnknownAttribute:
    if (attr.isStandardAttributeSyntax()) {
      state.getSema().Diag(attr.getLoc(),
                           diag::warn_unknown_attribute_ignored)
          << attr << attr.getRange();
      // Mark the attribute as invalid so we don't emit the same diagnostic
      // multiple times.
      attr.setInvalid();
    }
    break;

  case ParsedAttr::IgnoredAttribute:
    break;

  case ParsedAttr::AT_BTFTypeTag:
    HandleBTFTypeTagAttribute(type, attr, state);
    attr.setUsedAsTypeAttr();
    break;

  case ParsedAttr::AT_MayAlias:
    // FIXME: This attribute needs to actually be handled, but if we ignore
    // it it breaks large amounts of Linux software.
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_OpenCLPrivateAddressSpace:
  case ParsedAttr::AT_OpenCLGlobalAddressSpace:
  case ParsedAttr::AT_OpenCLGlobalDeviceAddressSpace:
  case ParsedAttr::AT_OpenCLGlobalHostAddressSpace:
  case ParsedAttr::AT_OpenCLLocalAddressSpace:
  case ParsedAttr::AT_OpenCLConstantAddressSpace:
  case ParsedAttr::AT_OpenCLGenericAddressSpace:
  case ParsedAttr::AT_AddressSpace:
    HandleAddressSpaceTypeAttribute(type, attr, state);
    attr.setUsedAsTypeAttr();
    break;
  OBJC_POINTER_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_ObjCGC: case ParsedAttr::AT_ObjCOwnership:
    if (!handleObjCPointerTypeAttr(state, attr, type))
      distributeObjCPointerTypeAttr(state, attr, type);
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_VectorSize:
    HandleVectorSizeAttr(type, attr, state.getSema());
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_ExtVectorType:
    HandleExtVectorTypeAttr(type, attr, state.getSema());
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_NeonVectorType:
    HandleNeonVectorTypeAttr(type, attr, state.getSema(),
                             VectorType::NeonVector);
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_NeonPolyVectorType:
    HandleNeonVectorTypeAttr(type, attr, state.getSema(),
                             VectorType::NeonPolyVector);
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_ArmSveVectorBits:
    HandleArmSveVectorBitsTypeAttr(type, attr, state.getSema());
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_ArmMveStrictPolymorphism: {
    HandleArmMveStrictPolymorphismAttr(state, type, attr);
    attr.setUsedAsTypeAttr();
    break;
  }
  case ParsedAttr::AT_OpenCLAccess:
    HandleOpenCLAccessAttr(type, attr, state.getSema());
    attr.setUsedAsTypeAttr();
    break;
  case ParsedAttr::AT_LifetimeBound:
    if (TAL == TAL_DeclChunk)
      HandleLifetimeBoundAttr(state, type, attr);
    break;

  case ParsedAttr::AT_NoDeref: {
    // FIXME: `noderef` currently doesn't work correctly in [[]] syntax.
    // See https://github.com/llvm/llvm-project/issues/55790 for details.
    // For the time being, we simply emit a warning that the attribute is
    // ignored.
    if (attr.isStandardAttributeSyntax()) {
      state.getSema().Diag(attr.getLoc(), diag::warn_attribute_ignored)
          << attr;
      break;
    }
    ASTContext &Ctx = state.getSema().Context;
    type = state.getAttributedType(createSimpleAttr<NoDerefAttr>(Ctx, attr),
                                   type, type);
    attr.setUsedAsTypeAttr();
    state.setParsedNoDeref(true);
    break;
  }

  case ParsedAttr::AT_MatrixType:
    HandleMatrixTypeAttr(type, attr, state.getSema());
    attr.setUsedAsTypeAttr();
    break;

  MS_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_Ptr32: case ParsedAttr::AT_Ptr64: case ParsedAttr
::AT_SPtr: case ParsedAttr::AT_UPtr:
    if (!handleMSPointerTypeQualifierAttr(state, attr, type))
      attr.setUsedAsTypeAttr();
    break;


  NULLABILITY_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_TypeNonNull: case ParsedAttr::AT_TypeNullable
: case ParsedAttr::AT_TypeNullableResult: case ParsedAttr::AT_TypeNullUnspecified:
    // Either add nullability here or try to distribute it.  We
    // don't want to distribute the nullability specifier past any
    // dependent type, because that complicates the user model.
    if (type->canHaveNullability() || type->isDependentType() ||
        type->isArrayType() ||
        !distributeNullabilityTypeAttr(state, type, attr)) {
      unsigned endIndex;
      if (TAL == TAL_DeclChunk)
        endIndex = state.getCurrentChunkIndex();
      else
        endIndex = state.getDeclarator().getNumTypeObjects();
      bool allowOnArrayType =
          state.getDeclarator().isPrototypeContext() &&
          !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex);
      if (checkNullabilityTypeSpecifier(
            state,
            type,
            attr,
            allowOnArrayType)) {
        attr.setInvalid();
      }

      attr.setUsedAsTypeAttr();
    }
    break;

  case ParsedAttr::AT_ObjCKindOf:
    // '__kindof' must be part of the decl-specifiers.
    switch (TAL) {
    case TAL_DeclSpec:
      break;

    case TAL_DeclChunk:
    case TAL_DeclName:
      state.getSema().Diag(attr.getLoc(),
                           diag::err_objc_kindof_wrong_position)
          << FixItHint::CreateRemoval(attr.getLoc())
          << FixItHint::CreateInsertion(
                 state.getDeclarator().getDeclSpec().getBeginLoc(),
                 "__kindof ");
      break;
    }

    // Apply it regardless.
    if (checkObjCKindOfType(state, type, attr))
      attr.setInvalid();
    break;

  case ParsedAttr::AT_NoThrow:
  // Exception Specifications aren't generally supported in C mode throughout
  // clang, so revert to attribute-based handling for C.
    if (!state.getSema().getLangOpts().CPlusPlus)
      break;
    [[fallthrough]];
  FUNCTION_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_NSReturnsRetained: case ParsedAttr::AT_NoReturn
: case ParsedAttr::AT_Regparm: case ParsedAttr::AT_CmseNSCall
: case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: case ParsedAttr
::AT_AnyX86NoCfCheck: case ParsedAttr::AT_CDecl: case ParsedAttr
::AT_FastCall: case ParsedAttr::AT_StdCall: case ParsedAttr::
AT_ThisCall: case ParsedAttr::AT_RegCall: case ParsedAttr::AT_Pascal
: case ParsedAttr::AT_SwiftCall: case ParsedAttr::AT_SwiftAsyncCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_AArch64SVEPcs: case ParsedAttr::AT_AMDGPUKernelCall
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
 ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll:
    attr.setUsedAsTypeAttr();

    // Attributes with standard syntax have strict rules for what they
    // appertain to and hence should not use the "distribution" logic below.
    if (attr.isStandardAttributeSyntax()) {
      if (!handleFunctionTypeAttr(state, attr, type)) {
        diagnoseBadTypeAttribute(state.getSema(), attr, type);
        attr.setInvalid();
      }
      break;
    }

    // Never process function type attributes as part of the
    // declaration-specifiers.
    if (TAL == TAL_DeclSpec)
      distributeFunctionTypeAttrFromDeclSpec(state, attr, type);

    // Otherwise, handle the possible delays.
    else if (!handleFunctionTypeAttr(state, attr, type))
      distributeFunctionTypeAttr(state, attr, type);
    break;
  case ParsedAttr::AT_AcquireHandle: {
    if (!type->isFunctionType())
      return;

    if (attr.getNumArgs() != 1) {
      state.getSema().Diag(attr.getLoc(),
                           diag::err_attribute_wrong_number_arguments)
          << attr << 1;
      attr.setInvalid();
      return;
    }

    StringRef HandleType;
    if (!state.getSema().checkStringLiteralArgumentAttr(attr, 0, HandleType))
      return;
    type = state.getAttributedType(
        AcquireHandleAttr::Create(state.getSema().Context, HandleType, attr),
        type, type);
    attr.setUsedAsTypeAttr();
    break;
  }
  case ParsedAttr::AT_AnnotateType: {
    HandleAnnotateTypeAttr(state, type, attr);
    attr.setUsedAsTypeAttr();
    break;
  }
  }

  // Handle attributes that are defined in a macro. We do not want this to be
  // applied to ObjC builtin attributes.
  if (isa<AttributedType>(type) && attr.hasMacroIdentifier() &&
      !type.getQualifiers().hasObjCLifetime() &&
      !type.getQualifiers().hasObjCGCAttr() &&
      attr.getKind() != ParsedAttr::AT_ObjCGC &&
      attr.getKind() != ParsedAttr::AT_ObjCOwnership) {
    const IdentifierInfo *MacroII = attr.getMacroIdentifier();
    type = state.getSema().Context.getMacroQualifiedType(type, MacroII);
    state.setExpansionLocForMacroQualifiedType(
        cast<MacroQualifiedType>(type.getTypePtr()),
        attr.getMacroExpansionLoc());
  }
}
8584}

8586void Sema::completeExprArrayBound(Expr *E) {
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
  if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
    if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
      auto *Def = Var->getDefinition();
      if (!Def) {
        SourceLocation PointOfInstantiation = E->getExprLoc();
        runWithSufficientStackSpace(PointOfInstantiation, [&] {
          InstantiateVariableDefinition(PointOfInstantiation, Var);
        });
        Def = Var->getDefinition();

        // If we don't already have a point of instantiation, and we managed
        // to instantiate a definition, this is the point of instantiation.
        // Otherwise, we don't request an end-of-TU instantiation, so this is
        // not a point of instantiation.
        // FIXME: Is this really the right behavior?
        if (Var->getPointOfInstantiation().isInvalid() && Def) {
          assert(Var->getTemplateSpecializationKind() ==(static_cast <bool> (Var->getTemplateSpecializationKind
() == TSK_ImplicitInstantiation && "explicit instantiation with no point of instantiation"
) ? void (0) : __assert_fail ("Var->getTemplateSpecializationKind() == TSK_ImplicitInstantiation && \"explicit instantiation with no point of instantiation\""
, "clang/lib/Sema/SemaType.cpp", 8606, __extension__ __PRETTY_FUNCTION__
))
                     TSK_ImplicitInstantiation &&(static_cast <bool> (Var->getTemplateSpecializationKind
() == TSK_ImplicitInstantiation && "explicit instantiation with no point of instantiation"
) ? void (0) : __assert_fail ("Var->getTemplateSpecializationKind() == TSK_ImplicitInstantiation && \"explicit instantiation with no point of instantiation\""
, "clang/lib/Sema/SemaType.cpp", 8606, __extension__ __PRETTY_FUNCTION__
))
                 "explicit instantiation with no point of instantiation")(static_cast <bool> (Var->getTemplateSpecializationKind
() == TSK_ImplicitInstantiation && "explicit instantiation with no point of instantiation"
) ? void (0) : __assert_fail ("Var->getTemplateSpecializationKind() == TSK_ImplicitInstantiation && \"explicit instantiation with no point of instantiation\""
, "clang/lib/Sema/SemaType.cpp", 8606, __extension__ __PRETTY_FUNCTION__
));
          Var->setTemplateSpecializationKind(
              Var->getTemplateSpecializationKind(), PointOfInstantiation);
        }
      }

      // Update the type to the definition's type both here and within the
      // expression.
      if (Def) {
        DRE->setDecl(Def);
        QualType T = Def->getType();
        DRE->setType(T);
        // FIXME: Update the type on all intervening expressions.
        E->setType(T);
      }

      // We still go on to try to complete the type independently, as it
      // may also require instantiations or diagnostics if it remains
      // incomplete.
    }
  }
}
8628}

8630QualType Sema::getCompletedType(Expr *E) {
// Incomplete array types may be completed by the initializer attached to
// their definitions. For static data members of class templates and for
// variable templates, we need to instantiate the definition to get this
// initializer and complete the type.
if (E->getType()->isIncompleteArrayType())
  completeExprArrayBound(E);

// FIXME: Are there other cases which require instantiating something other
// than the type to complete the type of an expression?

return E->getType();
8642}

8644/// Ensure that the type of the given expression is complete.
8645///
8646/// This routine checks whether the expression \p E has a complete type. If the
8647/// expression refers to an instantiable construct, that instantiation is
8648/// performed as needed to complete its type. Furthermore
8649/// Sema::RequireCompleteType is called for the expression's type (or in the
8650/// case of a reference type, the referred-to type).
8651///
8652/// \param E The expression whose type is required to be complete.
8653/// \param Kind Selects which completeness rules should be applied.
8654/// \param Diagnoser The object that will emit a diagnostic if the type is
8655/// incomplete.
8656///
8657/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
8658/// otherwise.
8659bool Sema::RequireCompleteExprType(Expr *E, CompleteTypeKind Kind,
                                 TypeDiagnoser &Diagnoser) {
return RequireCompleteType(E->getExprLoc(), getCompletedType(E), Kind,
                           Diagnoser);
8663}

8665bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
BoundTypeDiagnoser<> Diagnoser(DiagID);
return RequireCompleteExprType(E, CompleteTypeKind::Default, Diagnoser);
8668}

8670/// Ensure that the type T is a complete type.
8671///
8672/// This routine checks whether the type @p T is complete in any
8673/// context where a complete type is required. If @p T is a complete
8674/// type, returns false. If @p T is a class template specialization,
8675/// this routine then attempts to perform class template
8676/// instantiation. If instantiation fails, or if @p T is incomplete
8677/// and cannot be completed, issues the diagnostic @p diag (giving it
8678/// the type @p T) and returns true.
8679///
8680/// @param Loc  The location in the source that the incomplete type
8681/// diagnostic should refer to.
8682///
8683/// @param T  The type that this routine is examining for completeness.
8684///
8685/// @param Kind Selects which completeness rules should be applied.
8686///
8687/// @returns @c true if @p T is incomplete and a diagnostic was emitted,
8688/// @c false otherwise.
8689bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
                             CompleteTypeKind Kind,
                             TypeDiagnoser &Diagnoser) {
if (RequireCompleteTypeImpl(Loc, T, Kind, &Diagnoser))
  return true;
if (const TagType *Tag = T->getAs<TagType>()) {
  if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
    Tag->getDecl()->setCompleteDefinitionRequired();
    Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
  }
}
return false;
8701}

8703bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
if (!Suggested)
  return false;

// FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
// and isolate from other C++ specific checks.
StructuralEquivalenceContext Ctx(
    D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
    StructuralEquivalenceKind::Default,
    false /*StrictTypeSpelling*/, true /*Complain*/,
    true /*ErrorOnTagTypeMismatch*/);
return Ctx.IsEquivalent(D, Suggested);
8716}

8718bool Sema::hasAcceptableDefinition(NamedDecl *D, NamedDecl **Suggested,
                                 AcceptableKind Kind, bool OnlyNeedComplete) {
// Easy case: if we don't have modules, all declarations are visible.
if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility)
  return true;

// If this definition was instantiated from a template, map back to the
// pattern from which it was instantiated.
if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
  // We're in the middle of defining it; this definition should be treated
  // as visible.
  return true;
} else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
  if (auto *Pattern = RD->getTemplateInstantiationPattern())
    RD = Pattern;
  D = RD->getDefinition();
} else if (auto *ED = dyn_cast<EnumDecl>(D)) {
  if (auto *Pattern = ED->getTemplateInstantiationPattern())
    ED = Pattern;
  if (OnlyNeedComplete && (ED->isFixed() || getLangOpts().MSVCCompat)) {
    // If the enum has a fixed underlying type, it may have been forward
    // declared. In -fms-compatibility, `enum Foo;` will also forward declare
    // the enum and assign it the underlying type of `int`. Since we're only
    // looking for a complete type (not a definition), any visible declaration
    // of it will do.
    *Suggested = nullptr;
    for (auto *Redecl : ED->redecls()) {
      if (isAcceptable(Redecl, Kind))
        return true;
      if (Redecl->isThisDeclarationADefinition() ||
          (Redecl->isCanonicalDecl() && !*Suggested))
        *Suggested = Redecl;
    }

    return false;
  }
  D = ED->getDefinition();
} else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
  if (auto *Pattern = FD->getTemplateInstantiationPattern())
    FD = Pattern;
  D = FD->getDefinition();
} else if (auto *VD = dyn_cast<VarDecl>(D)) {
  if (auto *Pattern = VD->getTemplateInstantiationPattern())
    VD = Pattern;
  D = VD->getDefinition();
}

assert(D && "missing definition for pattern of instantiated definition")(static_cast <bool> (D && "missing definition for pattern of instantiated definition"
) ? void (0) : __assert_fail ("D && \"missing definition for pattern of instantiated definition\""
, "clang/lib/Sema/SemaType.cpp", 8765, __extension__ __PRETTY_FUNCTION__
));

*Suggested = D;

auto DefinitionIsAcceptable = [&] {
  // The (primary) definition might be in a visible module.
  if (isAcceptable(D, Kind))
    return true;

  // A visible module might have a merged definition instead.
  if (D->isModulePrivate() ? hasMergedDefinitionInCurrentModule(D)
                           : hasVisibleMergedDefinition(D)) {
    if (CodeSynthesisContexts.empty() &&
        !getLangOpts().ModulesLocalVisibility) {
      // Cache the fact that this definition is implicitly visible because
      // there is a visible merged definition.
      D->setVisibleDespiteOwningModule();
    }
    return true;
  }

  return false;
};

if (DefinitionIsAcceptable())
  return true;

// The external source may have additional definitions of this entity that are
// visible, so complete the redeclaration chain now and ask again.
if (auto *Source = Context.getExternalSource()) {
  Source->CompleteRedeclChain(D);
  return DefinitionIsAcceptable();
}

return false;
8800}

8802/// Determine whether there is any declaration of \p D that was ever a
8803///        definition (perhaps before module merging) and is currently visible.
8804/// \param D The definition of the entity.
8805/// \param Suggested Filled in with the declaration that should be made visible
8806///        in order to provide a definition of this entity.
8807/// \param OnlyNeedComplete If \c true, we only need the type to be complete,
8808///        not defined. This only matters for enums with a fixed underlying
8809///        type, since in all other cases, a type is complete if and only if it
8810///        is defined.
8811bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
                              bool OnlyNeedComplete) {
return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Visible,
                               OnlyNeedComplete);
8815}

8817/// Determine whether there is any declaration of \p D that was ever a
8818///        definition (perhaps before module merging) and is currently
8819///        reachable.
8820/// \param D The definition of the entity.
8821/// \param Suggested Filled in with the declaration that should be made
8822/// reachable
8823///        in order to provide a definition of this entity.
8824/// \param OnlyNeedComplete If \c true, we only need the type to be complete,
8825///        not defined. This only matters for enums with a fixed underlying
8826///        type, since in all other cases, a type is complete if and only if it
8827///        is defined.
8828bool Sema::hasReachableDefinition(NamedDecl *D, NamedDecl **Suggested,
                                bool OnlyNeedComplete) {
return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Reachable,
                               OnlyNeedComplete);
8832}

8834/// Locks in the inheritance model for the given class and all of its bases.
8835static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
RD = RD->getMostRecentNonInjectedDecl();
if (!RD->hasAttr<MSInheritanceAttr>()) {
  MSInheritanceModel IM;
  bool BestCase = false;
  switch (S.MSPointerToMemberRepresentationMethod) {
  case LangOptions::PPTMK_BestCase:
    BestCase = true;
    IM = RD->calculateInheritanceModel();
    break;
  case LangOptions::PPTMK_FullGeneralitySingleInheritance:
    IM = MSInheritanceModel::Single;
    break;
  case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
    IM = MSInheritanceModel::Multiple;
    break;
  case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
    IM = MSInheritanceModel::Unspecified;
    break;
  }

  SourceRange Loc = S.ImplicitMSInheritanceAttrLoc.isValid()
                        ? S.ImplicitMSInheritanceAttrLoc
                        : RD->getSourceRange();
  RD->addAttr(MSInheritanceAttr::CreateImplicit(
      S.getASTContext(), BestCase, Loc, AttributeCommonInfo::AS_Microsoft,
      MSInheritanceAttr::Spelling(IM)));
  S.Consumer.AssignInheritanceModel(RD);
}
8864}

8866/// The implementation of RequireCompleteType
8867bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
                                 CompleteTypeKind Kind,
                                 TypeDiagnoser *Diagnoser) {
// FIXME: Add this assertion to make sure we always get instantiation points.
//  assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
// FIXME: Add this assertion to help us flush out problems with
// checking for dependent types and type-dependent expressions.
//
//  assert(!T->isDependentType() &&
//         "Can't ask whether a dependent type is complete");

if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
  if (!MPTy->getClass()->isDependentType()) {
    if (getLangOpts().CompleteMemberPointers &&
        !MPTy->getClass()->getAsCXXRecordDecl()->isBeingDefined() &&
        RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), Kind,
                            diag::err_memptr_incomplete))
      return true;

    // We lock in the inheritance model once somebody has asked us to ensure
    // that a pointer-to-member type is complete.
    if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
      (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0));
      assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
    }
  }
}

NamedDecl *Def = nullptr;
bool AcceptSizeless = (Kind == CompleteTypeKind::AcceptSizeless);
bool Incomplete = (T->isIncompleteType(&Def) ||
                   (!AcceptSizeless && T->isSizelessBuiltinType()));

// Check that any necessary explicit specializations are visible. For an
// enum, we just need the declaration, so don't check this.
if (Def && !isa<EnumDecl>(Def))
  checkSpecializationReachability(Loc, Def);

// If we have a complete type, we're done.
if (!Incomplete) {
  NamedDecl *Suggested = nullptr;
  if (Def &&
      !hasReachableDefinition(Def, &Suggested, /*OnlyNeedComplete=*/true)) {
    // If the user is going to see an error here, recover by making the
    // definition visible.
    bool TreatAsComplete = Diagnoser && !isSFINAEContext();
    if (Diagnoser && Suggested)
      diagnoseMissingImport(Loc, Suggested, MissingImportKind::Definition,
                            /*Recover*/ TreatAsComplete);
    return !TreatAsComplete;
  } else if (Def && !TemplateInstCallbacks.empty()) {
    CodeSynthesisContext TempInst;
    TempInst.Kind = CodeSynthesisContext::Memoization;
    TempInst.Template = Def;
    TempInst.Entity = Def;
    TempInst.PointOfInstantiation = Loc;
    atTemplateBegin(TemplateInstCallbacks, *this, TempInst);
    atTemplateEnd(TemplateInstCallbacks, *this, TempInst);
  }

  return false;
}

TagDecl *Tag = dyn_cast_or_null<TagDecl>(Def);
ObjCInterfaceDecl *IFace = dyn_cast_or_null<ObjCInterfaceDecl>(Def);

// Give the external source a chance to provide a definition of the type.
// This is kept separate from completing the redeclaration chain so that
// external sources such as LLDB can avoid synthesizing a type definition
// unless it's actually needed.
if (Tag || IFace) {
  // Avoid diagnosing invalid decls as incomplete.
  if (Def->isInvalidDecl())
    return true;

  // Give the external AST source a chance to complete the type.
  if (auto *Source = Context.getExternalSource()) {
    if (Tag && Tag->hasExternalLexicalStorage())
        Source->CompleteType(Tag);
    if (IFace && IFace->hasExternalLexicalStorage())
        Source->CompleteType(IFace);
    // If the external source completed the type, go through the motions
    // again to ensure we're allowed to use the completed type.
    if (!T->isIncompleteType())
      return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
  }
}

// If we have a class template specialization or a class member of a
// class template specialization, or an array with known size of such,
// try to instantiate it.
if (auto *RD = dyn_cast_or_null<CXXRecordDecl>(Tag)) {
  bool Instantiated = false;
  bool Diagnosed = false;
  if (RD->isDependentContext()) {
    // Don't try to instantiate a dependent class (eg, a member template of
    // an instantiated class template specialization).
    // FIXME: Can this ever happen?
  } else if (auto *ClassTemplateSpec =
          dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
    if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
      runWithSufficientStackSpace(Loc, [&] {
        Diagnosed = InstantiateClassTemplateSpecialization(
            Loc, ClassTemplateSpec, TSK_ImplicitInstantiation,
            /*Complain=*/Diagnoser);
      });
      Instantiated = true;
    }
  } else {
    CXXRecordDecl *Pattern = RD->getInstantiatedFromMemberClass();
    if (!RD->isBeingDefined() && Pattern) {
      MemberSpecializationInfo *MSI = RD->getMemberSpecializationInfo();
      assert(MSI && "Missing member specialization information?")(static_cast <bool> (MSI && "Missing member specialization information?"
) ? void (0) : __assert_fail ("MSI && \"Missing member specialization information?\""
, "clang/lib/Sema/SemaType.cpp", 8979, __extension__ __PRETTY_FUNCTION__
));
      // This record was instantiated from a class within a template.
      if (MSI->getTemplateSpecializationKind() !=
          TSK_ExplicitSpecialization) {
        runWithSufficientStackSpace(Loc, [&] {
          Diagnosed = InstantiateClass(Loc, RD, Pattern,
                                       getTemplateInstantiationArgs(RD),
                                       TSK_ImplicitInstantiation,
                                       /*Complain=*/Diagnoser);
        });
        Instantiated = true;
      }
    }
  }

  if (Instantiated) {
    // Instantiate* might have already complained that the template is not
    // defined, if we asked it to.
    if (Diagnoser && Diagnosed)
      return true;
    // If we instantiated a definition, check that it's usable, even if
    // instantiation produced an error, so that repeated calls to this
    // function give consistent answers.
    if (!T->isIncompleteType())
      return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
  }
}

// FIXME: If we didn't instantiate a definition because of an explicit
// specialization declaration, check that it's visible.

if (!Diagnoser)
  return true;

Diagnoser->diagnose(*this, Loc, T);

// If the type was a forward declaration of a class/struct/union
// type, produce a note.
if (Tag && !Tag->isInvalidDecl() && !Tag->getLocation().isInvalid())
  Diag(Tag->getLocation(),
       Tag->isBeingDefined() ? diag::note_type_being_defined
                             : diag::note_forward_declaration)
    << Context.getTagDeclType(Tag);

// If the Objective-C class was a forward declaration, produce a note.
if (IFace && !IFace->isInvalidDecl() && !IFace->getLocation().isInvalid())
  Diag(IFace->getLocation(), diag::note_forward_class);

// If we have external information that we can use to suggest a fix,
// produce a note.
if (ExternalSource)
  ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);

return true;
9033}

9035bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
                             CompleteTypeKind Kind, unsigned DiagID) {
BoundTypeDiagnoser<> Diagnoser(DiagID);
return RequireCompleteType(Loc, T, Kind, Diagnoser);
9039}

9041/// Get diagnostic %select index for tag kind for
9042/// literal type diagnostic message.
9043/// WARNING: Indexes apply to particular diagnostics only!
9044///
9045/// \returns diagnostic %select index.
9046static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
switch (Tag) {
case TTK_Struct: return 0;
case TTK_Interface: return 1;
case TTK_Class:  return 2;
default: llvm_unreachable("Invalid tag kind for literal type diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for literal type diagnostic!"
, "clang/lib/Sema/SemaType.cpp", 9051);
}
9053}

9055/// Ensure that the type T is a literal type.
9056///
9057/// This routine checks whether the type @p T is a literal type. If @p T is an
9058/// incomplete type, an attempt is made to complete it. If @p T is a literal
9059/// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
9060/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
9061/// it the type @p T), along with notes explaining why the type is not a
9062/// literal type, and returns true.
9063///
9064/// @param Loc  The location in the source that the non-literal type
9065/// diagnostic should refer to.
9066///
9067/// @param T  The type that this routine is examining for literalness.
9068///
9069/// @param Diagnoser Emits a diagnostic if T is not a literal type.
9070///
9071/// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
9072/// @c false otherwise.
9073bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
                            TypeDiagnoser &Diagnoser) {
assert(!T->isDependentType() && "type should not be dependent")(static_cast <bool> (!T->isDependentType() &&
 "type should not be dependent") ? void (0) : __assert_fail (
"!T->isDependentType() && \"type should not be dependent\""
, "clang/lib/Sema/SemaType.cpp", 9075, __extension__ __PRETTY_FUNCTION__
));

QualType ElemType = Context.getBaseElementType(T);
if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) &&
    T->isLiteralType(Context))
  return false;

Diagnoser.diagnose(*this, Loc, T);

if (T->isVariableArrayType())
  return true;

const RecordType *RT = ElemType->getAs<RecordType>();
if (!RT)
  return true;

const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());

// A partially-defined class type can't be a literal type, because a literal
// class type must have a trivial destructor (which can't be checked until
// the class definition is complete).
if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T))
  return true;

// [expr.prim.lambda]p3:
//   This class type is [not] a literal type.
if (RD->isLambda() && !getLangOpts().CPlusPlus17) {
  Diag(RD->getLocation(), diag::note_non_literal_lambda);
  return true;
}

// If the class has virtual base classes, then it's not an aggregate, and
// cannot have any constexpr constructors or a trivial default constructor,
// so is non-literal. This is better to diagnose than the resulting absence
// of constexpr constructors.
if (RD->getNumVBases()) {
  Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
    << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
  for (const auto &I : RD->vbases())
    Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
        << I.getSourceRange();
} else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
           !RD->hasTrivialDefaultConstructor()) {
  Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
} else if (RD->hasNonLiteralTypeFieldsOrBases()) {
  for (const auto &I : RD->bases()) {
    if (!I.getType()->isLiteralType(Context)) {
      Diag(I.getBeginLoc(), diag::note_non_literal_base_class)
          << RD << I.getType() << I.getSourceRange();
      return true;
    }
  }
  for (const auto *I : RD->fields()) {
    if (!I->getType()->isLiteralType(Context) ||
        I->getType().isVolatileQualified()) {
      Diag(I->getLocation(), diag::note_non_literal_field)
        << RD << I << I->getType()
        << I->getType().isVolatileQualified();
      return true;
    }
  }
} else if (getLangOpts().CPlusPlus20 ? !RD->hasConstexprDestructor()
                                     : !RD->hasTrivialDestructor()) {
  // All fields and bases are of literal types, so have trivial or constexpr
  // destructors. If this class's destructor is non-trivial / non-constexpr,
  // it must be user-declared.
  CXXDestructorDecl *Dtor = RD->getDestructor();
  assert(Dtor && "class has literal fields and bases but no dtor?")(static_cast <bool> (Dtor && "class has literal fields and bases but no dtor?"
) ? void (0) : __assert_fail ("Dtor && \"class has literal fields and bases but no dtor?\""
, "clang/lib/Sema/SemaType.cpp", 9142, __extension__ __PRETTY_FUNCTION__
));
  if (!Dtor)
    return true;

  if (getLangOpts().CPlusPlus20) {
    Diag(Dtor->getLocation(), diag::note_non_literal_non_constexpr_dtor)
        << RD;
  } else {
    Diag(Dtor->getLocation(), Dtor->isUserProvided()
                                  ? diag::note_non_literal_user_provided_dtor
                                  : diag::note_non_literal_nontrivial_dtor)
        << RD;
    if (!Dtor->isUserProvided())
      SpecialMemberIsTrivial(Dtor, CXXDestructor, TAH_IgnoreTrivialABI,
                             /*Diagnose*/ true);
  }
}

return true;
9161}

9163bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
BoundTypeDiagnoser<> Diagnoser(DiagID);
return RequireLiteralType(Loc, T, Diagnoser);
9166}

9168/// Retrieve a version of the type 'T' that is elaborated by Keyword, qualified
9169/// by the nested-name-specifier contained in SS, and that is (re)declared by
9170/// OwnedTagDecl, which is nullptr if this is not a (re)declaration.
9171QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
                               const CXXScopeSpec &SS, QualType T,
                               TagDecl *OwnedTagDecl) {
if (T.isNull())
  return T;
return Context.getElaboratedType(
    Keyword, SS.isValid() ? SS.getScopeRep() : nullptr, T, OwnedTagDecl);
9178}

9180QualType Sema::BuildTypeofExprType(Expr *E, TypeOfKind Kind) {
assert(!E->hasPlaceholderType() && "unexpected placeholder")(static_cast <bool> (!E->hasPlaceholderType() &&
 "unexpected placeholder") ? void (0) : __assert_fail ("!E->hasPlaceholderType() && \"unexpected placeholder\""
, "clang/lib/Sema/SemaType.cpp", 9181, __extension__ __PRETTY_FUNCTION__
));

if (!getLangOpts().CPlusPlus && E->refersToBitField())
  Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
      << (Kind == TypeOfKind::Unqualified ? 3 : 2);

if (!E->isTypeDependent()) {
  QualType T = E->getType();
  if (const TagType *TT = T->getAs<TagType>())
    DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
}
return Context.getTypeOfExprType(E, Kind);
9193}

9195/// getDecltypeForExpr - Given an expr, will return the decltype for
9196/// that expression, according to the rules in C++11
9197/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
9198QualType Sema::getDecltypeForExpr(Expr *E) {
if (E->isTypeDependent())
  return Context.DependentTy;

Expr *IDExpr = E;
if (auto *ImplCastExpr = dyn_cast<ImplicitCastExpr>(E))
  IDExpr = ImplCastExpr->getSubExpr();

// C++11 [dcl.type.simple]p4:
//   The type denoted by decltype(e) is defined as follows:

// C++20:
//     - if E is an unparenthesized id-expression naming a non-type
//       template-parameter (13.2), decltype(E) is the type of the
//       template-parameter after performing any necessary type deduction
// Note that this does not pick up the implicit 'const' for a template
// parameter object. This rule makes no difference before C++20 so we apply
// it unconditionally.
if (const auto *SNTTPE = dyn_cast<SubstNonTypeTemplateParmExpr>(IDExpr))
  return SNTTPE->getParameterType(Context);

//     - if e is an unparenthesized id-expression or an unparenthesized class
//       member access (5.2.5), decltype(e) is the type of the entity named
//       by e. If there is no such entity, or if e names a set of overloaded
//       functions, the program is ill-formed;
//
// We apply the same rules for Objective-C ivar and property references.
if (const auto *DRE = dyn_cast<DeclRefExpr>(IDExpr)) {
  const ValueDecl *VD = DRE->getDecl();
  QualType T = VD->getType();
  return isa<TemplateParamObjectDecl>(VD) ? T.getUnqualifiedType() : T;
}
if (const auto *ME = dyn_cast<MemberExpr>(IDExpr)) {
  if (const auto *VD = ME->getMemberDecl())
    if (isa<FieldDecl>(VD) || isa<VarDecl>(VD))
      return VD->getType();
} else if (const auto *IR = dyn_cast<ObjCIvarRefExpr>(IDExpr)) {
  return IR->getDecl()->getType();
} else if (const auto *PR = dyn_cast<ObjCPropertyRefExpr>(IDExpr)) {
  if (PR->isExplicitProperty())
    return PR->getExplicitProperty()->getType();
} else if (const auto *PE = dyn_cast<PredefinedExpr>(IDExpr)) {
  return PE->getType();
}

// C++11 [expr.lambda.prim]p18:
//   Every occurrence of decltype((x)) where x is a possibly
//   parenthesized id-expression that names an entity of automatic
//   storage duration is treated as if x were transformed into an
//   access to a corresponding data member of the closure type that
//   would have been declared if x were an odr-use of the denoted
//   entity.
if (getCurLambda() && isa<ParenExpr>(IDExpr)) {
  if (auto *DRE = dyn_cast<DeclRefExpr>(IDExpr->IgnoreParens())) {
    if (auto *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
      QualType T = getCapturedDeclRefType(Var, DRE->getLocation());
      if (!T.isNull())
        return Context.getLValueReferenceType(T);
    }
  }
}

return Context.getReferenceQualifiedType(E);
9261}

9263QualType Sema::BuildDecltypeType(Expr *E, bool AsUnevaluated) {
assert(!E->hasPlaceholderType() && "unexpected placeholder")(static_cast <bool> (!E->hasPlaceholderType() &&
 "unexpected placeholder") ? void (0) : __assert_fail ("!E->hasPlaceholderType() && \"unexpected placeholder\""
, "clang/lib/Sema/SemaType.cpp", 9264, __extension__ __PRETTY_FUNCTION__
));

if (AsUnevaluated && CodeSynthesisContexts.empty() &&
    !E->isInstantiationDependent() && E->HasSideEffects(Context, false)) {
  // The expression operand for decltype is in an unevaluated expression
  // context, so side effects could result in unintended consequences.
  // Exclude instantiation-dependent expressions, because 'decltype' is often
  // used to build SFINAE gadgets.
  Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
}
return Context.getDecltypeType(E, getDecltypeForExpr(E));
9275}

9277static QualType GetEnumUnderlyingType(Sema &S, QualType BaseType,
                                    SourceLocation Loc) {
assert(BaseType->isEnumeralType())(static_cast <bool> (BaseType->isEnumeralType()) ? void
 (0) : __assert_fail ("BaseType->isEnumeralType()", "clang/lib/Sema/SemaType.cpp"
, 9279, __extension__ __PRETTY_FUNCTION__));
EnumDecl *ED = BaseType->castAs<EnumType>()->getDecl();
assert(ED && "EnumType has no EnumDecl")(static_cast <bool> (ED && "EnumType has no EnumDecl"
) ? void (0) : __assert_fail ("ED && \"EnumType has no EnumDecl\""
, "clang/lib/Sema/SemaType.cpp", 9281, __extension__ __PRETTY_FUNCTION__
));

S.DiagnoseUseOfDecl(ED, Loc);

QualType Underlying = ED->getIntegerType();
assert(!Underlying.isNull())(static_cast <bool> (!Underlying.isNull()) ? void (0) :
 __assert_fail ("!Underlying.isNull()", "clang/lib/Sema/SemaType.cpp"
, 9286, __extension__ __PRETTY_FUNCTION__));

return Underlying;
9289}

9291QualType Sema::BuiltinEnumUnderlyingType(QualType BaseType,
                                       SourceLocation Loc) {
if (!BaseType->isEnumeralType()) {
  Diag(Loc, diag::err_only_enums_have_underlying_types);
  return QualType();
}

// The enum could be incomplete if we're parsing its definition or
// recovering from an error.
NamedDecl *FwdDecl = nullptr;
if (BaseType->isIncompleteType(&FwdDecl)) {
  Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
  Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
  return QualType();
}

return GetEnumUnderlyingType(*this, BaseType, Loc);
9308}

9310QualType Sema::BuiltinAddPointer(QualType BaseType, SourceLocation Loc) {
QualType Pointer = BaseType.isReferenceable() || BaseType->isVoidType()
                       ? BuildPointerType(BaseType.getNonReferenceType(), Loc,
                                          DeclarationName())
                       : BaseType;

return Pointer.isNull() ? QualType() : Pointer;
9317}

9319QualType Sema::BuiltinRemovePointer(QualType BaseType, SourceLocation Loc) {
// We don't want block pointers or ObjectiveC's id type.
if (!BaseType->isAnyPointerType() || BaseType->isObjCIdType())
  return BaseType;

return BaseType->getPointeeType();
9325}

9327QualType Sema::BuiltinDecay(QualType BaseType, SourceLocation Loc) {
QualType Underlying = BaseType.getNonReferenceType();
if (Underlying->isArrayType())
  return Context.getDecayedType(Underlying);

if (Underlying->isFunctionType())
  return BuiltinAddPointer(BaseType, Loc);

SplitQualType Split = Underlying.getSplitUnqualifiedType();
// std::decay is supposed to produce 'std::remove_cv', but since 'restrict' is
// in the same group of qualifiers as 'const' and 'volatile', we're extending
// '__decay(T)' so that it removes all qualifiers.
Split.Quals.removeCVRQualifiers();
return Context.getQualifiedType(Split);
9341}

9343QualType Sema::BuiltinAddReference(QualType BaseType, UTTKind UKind,
                                 SourceLocation Loc) {
assert(LangOpts.CPlusPlus)(static_cast <bool> (LangOpts.CPlusPlus) ? void (0) : __assert_fail
 ("LangOpts.CPlusPlus", "clang/lib/Sema/SemaType.cpp", 9345, __extension__
 __PRETTY_FUNCTION__));
QualType Reference =
    BaseType.isReferenceable()
        ? BuildReferenceType(BaseType,
                             UKind == UnaryTransformType::AddLvalueReference,
                             Loc, DeclarationName())
        : BaseType;
return Reference.isNull() ? QualType() : Reference;
9353}

9355QualType Sema::BuiltinRemoveExtent(QualType BaseType, UTTKind UKind,
                                 SourceLocation Loc) {
if (UKind == UnaryTransformType::RemoveAllExtents)
  return Context.getBaseElementType(BaseType);

if (const auto *AT = Context.getAsArrayType(BaseType))
  return AT->getElementType();

return BaseType;
9364}

9366QualType Sema::BuiltinRemoveReference(QualType BaseType, UTTKind UKind,
                                    SourceLocation Loc) {
assert(LangOpts.CPlusPlus)(static_cast <bool> (LangOpts.CPlusPlus) ? void (0) : __assert_fail
 ("LangOpts.CPlusPlus", "clang/lib/Sema/SemaType.cpp", 9368, __extension__
 __PRETTY_FUNCTION__));
QualType T = BaseType.getNonReferenceType();
if (UKind == UTTKind::RemoveCVRef &&
    (T.isConstQualified() || T.isVolatileQualified())) {
  Qualifiers Quals;
  QualType Unqual = Context.getUnqualifiedArrayType(T, Quals);
  Quals.removeConst();
  Quals.removeVolatile();
  T = Context.getQualifiedType(Unqual, Quals);
}
return T;
9379}

9381QualType Sema::BuiltinChangeCVRQualifiers(QualType BaseType, UTTKind UKind,
                                        SourceLocation Loc) {
if ((BaseType->isReferenceType() && UKind != UTTKind::RemoveRestrict) ||
    BaseType->isFunctionType())
  return BaseType;

Qualifiers Quals;
QualType Unqual = Context.getUnqualifiedArrayType(BaseType, Quals);

if (UKind == UTTKind::RemoveConst || UKind == UTTKind::RemoveCV)
  Quals.removeConst();
if (UKind == UTTKind::RemoveVolatile || UKind == UTTKind::RemoveCV)
  Quals.removeVolatile();
if (UKind == UTTKind::RemoveRestrict)
  Quals.removeRestrict();

return Context.getQualifiedType(Unqual, Quals);
9398}

9400static QualType ChangeIntegralSignedness(Sema &S, QualType BaseType,
                                       bool IsMakeSigned,
                                       SourceLocation Loc) {
if (BaseType->isEnumeralType()) {
  QualType Underlying = GetEnumUnderlyingType(S, BaseType, Loc);
  if (auto *BitInt = dyn_cast<BitIntType>(Underlying)) {
    unsigned int Bits = BitInt->getNumBits();
    if (Bits > 1)
      return S.Context.getBitIntType(!IsMakeSigned, Bits);

    S.Diag(Loc, diag::err_make_signed_integral_only)
        << IsMakeSigned << /*_BitInt(1)*/ true << BaseType << 1 << Underlying;
    return QualType();
  }
  if (Underlying->isBooleanType()) {
    S.Diag(Loc, diag::err_make_signed_integral_only)
        << IsMakeSigned << /*_BitInt(1)*/ false << BaseType << 1
        << Underlying;
    return QualType();
  }
}

bool Int128Unsupported = !S.Context.getTargetInfo().hasInt128Type();
std::array<CanQualType *, 6> AllSignedIntegers = {
    &S.Context.SignedCharTy, &S.Context.ShortTy,    &S.Context.IntTy,
    &S.Context.LongTy,       &S.Context.LongLongTy, &S.Context.Int128Ty};
ArrayRef<CanQualType *> AvailableSignedIntegers(
    AllSignedIntegers.data(), AllSignedIntegers.size() - Int128Unsupported);
std::array<CanQualType *, 6> AllUnsignedIntegers = {
    &S.Context.UnsignedCharTy,     &S.Context.UnsignedShortTy,
    &S.Context.UnsignedIntTy,      &S.Context.UnsignedLongTy,
    &S.Context.UnsignedLongLongTy, &S.Context.UnsignedInt128Ty};
ArrayRef<CanQualType *> AvailableUnsignedIntegers(AllUnsignedIntegers.data(),
                                                  AllUnsignedIntegers.size() -
                                                      Int128Unsupported);
ArrayRef<CanQualType *> *Consider =
    IsMakeSigned ? &AvailableSignedIntegers : &AvailableUnsignedIntegers;

uint64_t BaseSize = S.Context.getTypeSize(BaseType);
auto *Result =
    llvm::find_if(*Consider, [&S, BaseSize](const CanQual<Type> *T) {
      return BaseSize == S.Context.getTypeSize(T->getTypePtr());
    });

assert(Result != Consider->end())(static_cast <bool> (Result != Consider->end()) ? void
 (0) : __assert_fail ("Result != Consider->end()", "clang/lib/Sema/SemaType.cpp"
, 9444, __extension__ __PRETTY_FUNCTION__));
return QualType((*Result)->getTypePtr(), 0);
9446}

9448QualType Sema::BuiltinChangeSignedness(QualType BaseType, UTTKind UKind,
                                     SourceLocation Loc) {
bool IsMakeSigned = UKind == UnaryTransformType::MakeSigned;
if ((!BaseType->isIntegerType() && !BaseType->isEnumeralType()) ||
    BaseType->isBooleanType() ||
    (BaseType->isBitIntType() &&
     BaseType->getAs<BitIntType>()->getNumBits() < 2)) {
  Diag(Loc, diag::err_make_signed_integral_only)
      << IsMakeSigned << BaseType->isBitIntType() << BaseType << 0;
  return QualType();
}

bool IsNonIntIntegral =
    BaseType->isChar16Type() || BaseType->isChar32Type() ||
    BaseType->isWideCharType() || BaseType->isEnumeralType();

QualType Underlying =
    IsNonIntIntegral
        ? ChangeIntegralSignedness(*this, BaseType, IsMakeSigned, Loc)
    : IsMakeSigned ? Context.getCorrespondingSignedType(BaseType)
                   : Context.getCorrespondingUnsignedType(BaseType);
if (Underlying.isNull())
  return Underlying;
return Context.getQualifiedType(Underlying, BaseType.getQualifiers());
9472}

9474QualType Sema::BuildUnaryTransformType(QualType BaseType, UTTKind UKind,
                                     SourceLocation Loc) {
if (BaseType->isDependentType())
  return Context.getUnaryTransformType(BaseType, BaseType, UKind);
QualType Result;
switch (UKind) {
case UnaryTransformType::EnumUnderlyingType: {
  Result = BuiltinEnumUnderlyingType(BaseType, Loc);
  break;
}
case UnaryTransformType::AddPointer: {
  Result = BuiltinAddPointer(BaseType, Loc);
  break;
}
case UnaryTransformType::RemovePointer: {
  Result = BuiltinRemovePointer(BaseType, Loc);
  break;
}
case UnaryTransformType::Decay: {
  Result = BuiltinDecay(BaseType, Loc);
  break;
}
case UnaryTransformType::AddLvalueReference:
case UnaryTransformType::AddRvalueReference: {
  Result = BuiltinAddReference(BaseType, UKind, Loc);
  break;
}
case UnaryTransformType::RemoveAllExtents:
case UnaryTransformType::RemoveExtent: {
  Result = BuiltinRemoveExtent(BaseType, UKind, Loc);
  break;
}
case UnaryTransformType::RemoveCVRef:
case UnaryTransformType::RemoveReference: {
  Result = BuiltinRemoveReference(BaseType, UKind, Loc);
  break;
}
case UnaryTransformType::RemoveConst:
case UnaryTransformType::RemoveCV:
case UnaryTransformType::RemoveRestrict:
case UnaryTransformType::RemoveVolatile: {
  Result = BuiltinChangeCVRQualifiers(BaseType, UKind, Loc);
  break;
}
case UnaryTransformType::MakeSigned:
case UnaryTransformType::MakeUnsigned: {
  Result = BuiltinChangeSignedness(BaseType, UKind, Loc);
  break;
}
}

return !Result.isNull()
           ? Context.getUnaryTransformType(BaseType, Result, UKind)
           : Result;
9528}

9530QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
if (!isDependentOrGNUAutoType(T)) {
  // FIXME: It isn't entirely clear whether incomplete atomic types
  // are allowed or not; for simplicity, ban them for the moment.
  if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
    return QualType();

  int DisallowedKind = -1;
  if (T->isArrayType())
    DisallowedKind = 1;
  else if (T->isFunctionType())
    DisallowedKind = 2;
  else if (T->isReferenceType())
    DisallowedKind = 3;
  else if (T->isAtomicType())
    DisallowedKind = 4;
  else if (T.hasQualifiers())
    DisallowedKind = 5;
  else if (T->isSizelessType())
    DisallowedKind = 6;
  else if (!T.isTriviallyCopyableType(Context))
    // Some other non-trivially-copyable type (probably a C++ class)
    DisallowedKind = 7;
  else if (T->isBitIntType())
    DisallowedKind = 8;

  if (DisallowedKind != -1) {
    Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
    return QualType();
  }

  // FIXME: Do we need any handling for ARC here?
}

// Build the pointer type.
return Context.getAtomicType(T);
9566}