/build/source/clang/lib/Sema/SemaType.cpp

Bug Summary

File:	build/source/clang/lib/Sema/SemaType.cpp
Warning:	line 2688, column 24 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/source/build-llvm -resource-dir /usr/lib/llvm-17/lib/clang/17 -I tools/clang/lib/Sema -I /build/source/clang/lib/Sema -I /build/source/clang/include -I tools/clang/include -I include -I /build/source/llvm/include -D _DEBUG -D _GLIBCXX_ASSERTIONS -D _GNU_SOURCE -D _LIBCPP_ENABLE_ASSERTIONS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -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-17/lib/clang/17/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/source/build-llvm=build-llvm -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm=build-llvm -fcoverage-prefix-map=/build/source/= -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/source/build-llvm -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -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-2023-05-10-133810-16478-1 -x c++ /build/source/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 "llvm/TargetParser/RISCVTargetParser.h"
44#include <bitset>
45#include <optional>

47using namespace clang;

49enum TypeDiagSelector {
TDS_Function,
TDS_Pointer,
TDS_ObjCObjOrBlock
53};

55/// isOmittedBlockReturnType - Return true if this declarator is missing a
56/// return type because this is a omitted return type on a block literal.
57static 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;
70}

72/// diagnoseBadTypeAttribute - Diagnoses a type attribute which
73/// doesn't apply to the given type.
74static 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;
108}

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

116// Calling convention attributes.
117#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

137// Function type attributes.
138#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

147// Microsoft-specific type qualifiers.
148#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

154// Nullability qualifiers.
155#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

161namespace {
/// 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", 222, __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", 310);
  }

  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", 317, __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", 317, __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());
  }
};
344} // end anonymous namespace

346static void moveAttrFromListToList(ParsedAttr &attr,
                                 ParsedAttributesView &fromList,
                                 ParsedAttributesView &toList) {
fromList.remove(&attr);
toList.addAtEnd(&attr);
351}

353/// The location of a type attribute.
354enum 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
361};

363static void processTypeAttrs(TypeProcessingState &state, QualType &type,
                           TypeAttrLocation TAL,
                           const ParsedAttributesView &attrs);

367static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                                 QualType &type);

370static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
                                           ParsedAttr &attr, QualType &type);

373static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
                               QualType &type);

376static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
                                      ParsedAttr &attr, QualType &type);

379static 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", 383, __extension__ __PRETTY_FUNCTION__
));
return handleObjCOwnershipTypeAttr(state, attr, type);
385}

387/// Given the index of a declarator chunk, check whether that chunk
388/// directly specifies the return type of a function and, if so, find
389/// an appropriate place for it.
390///
391/// \param i - a notional index which the search will start
392///   immediately inside
393///
394/// \param onlyBlockPointers Whether we should only look into block
395/// pointer types (vs. all pointer types).
396static 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", 399, __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", 443);
    }

    // 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", 449);

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

// Ran out of chunks, bail out.
return result;
457}

459/// Given that an objc_gc attribute was written somewhere on a
460/// declaration *other* than on the declarator itself (for which, use
461/// distributeObjCPointerTypeAttrFromDeclarator), and given that it
462/// didn't apply in whatever position it was written in, try to move
463/// it to a more appropriate position.
464static 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);
516}

518/// Distribute an objc_gc type attribute that was written on the
519/// declarator.
520static 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);
575}

577/// A function type attribute was written somewhere in a declaration
578/// *other* than on the declarator itself or in the decl spec.  Given
579/// that it didn't apply in whatever position it was written in, try
580/// to move it to a more appropriate position.
581static 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);
607}

609/// Try to distribute a function type attribute to the innermost
610/// function chunk or type.  Returns true if the attribute was
611/// distributed, false if no location was found.
612static 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);
627}

629/// A function type attribute was written in the decl spec.  Try to
630/// apply it somewhere.
631static 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);
644}

646/// A function type attribute was written on the declarator or declaration.
647/// Try to apply it somewhere.
648/// `Attrs` is the attribute list containing the declaration (either of the
649/// declarator or the declaration).
650static 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);
664}

666/// Given that there are attributes written on the declarator or declaration
667/// itself, try to distribute any type attributes to the appropriate
668/// declarator chunk.
669///
670/// These are attributes like the following:
671///   int f ATTR;
672///   int (f ATTR)();
673/// but not necessarily this:
674///   int f() ATTR;
675///
676/// `Attrs` is the attribute list containing the declaration (either of the
677/// declarator or the declaration).
678static 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;
  }
}
714}

716/// Add a synthetic '()' to a block-literal declarator if it is
717/// required, given the return type.
718static 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=*/std::nullopt, 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", 770, __extension__ __PRETTY_FUNCTION__
));
state.setCurrentChunkIndex(declarator.getNumTypeObjects());
772}

774static 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;
}
798}

800/// Return true if this is omitted block return type. Also check type
801/// attributes and type qualifiers when returning true.
802static 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;
829}

831/// Apply Objective-C type arguments to the given type.
832static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
                                ArrayRef<TypeSourceInfo *> typeArgs,
                                SourceRange typeArgsRange, bool failOnError,
                                bool rebuilding) {
// We can only apply type arguments to an Objective-C class type.
const auto *objcObjectType = type->getAs<ObjCObjectType>();
if (!objcObjectType || !objcObjectType->getInterface()) {
  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) {
  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()) {
  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) {
  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()) {
    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;
      }
    }

    // When rebuilding, qualifiers might have gotten here through a
    // final substitution.
    if (!rebuilding && !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>())
    anyPackExpansions = true;

  // Find the corresponding type parameter, if there is one.
  ObjCTypeParamDecl *typeParam = nullptr;
  if (!anyPackExpansions) {
    if (i < numTypeParams) {
      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>()) {
    // 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", 944, __extension__ __PRETTY_FUNCTION__
));
      continue;
    }

    // Retrieve the bound.
    QualType bound = typeParam->getUnderlyingType();
    const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();

    // Determine whether the type argument is substitutable for the bound.
    if (typeArgObjC->isObjCIdType()) {
      // When the type argument is 'id', the only acceptable type
      // parameter bound is 'id'.
      if (boundObjC->isObjCIdType())
        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", 982, __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);
1038}

1040QualType 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;
1061}

1063QualType 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, bool Rebuilding) {
QualType Result = BaseType;
if (!TypeArgs.empty()) {
  Result =
      applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
                        SourceRange(TypeArgsLAngleLoc, TypeArgsRAngleLoc),
                        FailOnError, Rebuilding);
  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::ArrayRef((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);
1131}

1133TypeResult 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())
  return true;

// Handle missing type-source info.
if (!BaseTypeInfo)
  BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);

// Extract type arguments.
SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
  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", 1163, __extension__ __PRETTY_FUNCTION__
));
  ActualTypeArgInfos.push_back(TypeArgInfo);
}

// Build the object type.
QualType Result = BuildObjCObjectType(
    T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
    TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
    ProtocolLAngleLoc,
    llvm::ArrayRef((ObjCProtocolDecl *const *)Protocols.data(),
                   Protocols.size()),
    ProtocolLocs, ProtocolRAngleLoc,
    /*FailOnError=*/false,
    /*Rebuilding=*/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.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice) &&
      !S.getLangOpts().SYCLIsDevice)
    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", 1589, __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", 1589, __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", 1589, __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", 1589, __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", 1605, __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", 1605, __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", 1605, __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", 1605, __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", 1618, __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", 1631, __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", 1645, __extension__ __PRETTY_FUNCTION__
));
  // TypeQuals handled by caller.
  Result = S.BuildDecltypeType(E);
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;
}
1654#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case DeclSpec::TST_##Trait:
1655#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", 1657, __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", 1707, __extension__ __PRETTY_FUNCTION__
));
  Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
  if (Result.isNull()) {
    Result = Context.IntTy;
    declarator.setInvalidType(true);
  }
  break;

1715#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", 1728);                         \
  }                                                                          \
  break;
1731#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", 1790, __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", 1912, __extension__ __PRETTY_FUNCTION__
));
return Result;
1914}

1916static std::string getPrintableNameForEntity(DeclarationName Entity) {
if (Entity)
  return Entity.getAsString();

return "type name";
1921}

1923static bool isDependentOrGNUAutoType(QualType T) {
if (T->isDependentType())
  return true;

const auto *AT = dyn_cast<AutoType>(T);
return AT && AT->isGNUAutoType();
1929}

1931QualType 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);
1979}

1981QualType 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);
2023}

2025/// Build a paren type including \p T.
2026QualType Sema::BuildParenType(QualType T) {
return Context.getParenType(T);
2028}

2030/// Given that we're building a pointer or reference to the given
2031static 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", 2075, __extension__ __PRETTY_FUNCTION__
));

Qualifiers qs;
qs.addObjCLifetime(implicitLifetime);
return S.Context.getQualifiedType(type, qs);
2080}

2082static 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;
2103}

2105namespace {
2106/// Kinds of declarator that cannot contain a qualified function type.
2107///
2108/// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
2109///     a function type with a cv-qualifier or a ref-qualifier can only appear
2110///     at the topmost level of a type.
2111///
2112/// Parens and member pointers are permitted. We don't diagnose array and
2113/// function declarators, because they don't allow function types at all.
2114///
2115/// The values of this enum are used in diagnostics.
2116enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
2117} // end anonymous namespace

2119/// Check whether the type T is a qualified function type, and if it is,
2120/// diagnose that it cannot be contained within the given kind of declarator.
2121static 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;
2133}

2135bool 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;
2144}

2146// Helper to deduce addr space of a pointee type in OpenCL mode.
2147static 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;
2154}

2156/// Build a pointer type.
2157///
2158/// \param T The type to which we'll be building a pointer.
2159///
2160/// \param Loc The location of the entity whose type involves this
2161/// pointer type or, if there is no such entity, the location of the
2162/// type that will have pointer type.
2163///
2164/// \param Entity The name of the entity that involves the pointer
2165/// type, if known.
2166///
2167/// \returns A suitable pointer type, if there are no
2168/// errors. Otherwise, returns a NULL type.
2169QualType 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", 2193, __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);

// In WebAssembly, pointers to reference types are illegal.
if (getASTContext().getTargetInfo().getTriple().isWasm() &&
    T->isWebAssemblyReferenceType()) {
  Diag(Loc, diag::err_wasm_reference_pr) << 0;
  return QualType();
}

// Build the pointer type.
return Context.getPointerType(T);
2211}

2213/// Build a reference type.
2214///
2215/// \param T The type to which we'll be building a reference.
2216///
2217/// \param Loc The location of the entity whose type involves this
2218/// reference type or, if there is no such entity, the location of the
2219/// type that will have reference type.
2220///
2221/// \param Entity The name of the entity that involves the reference
2222/// type, if known.
2223///
2224/// \returns A suitable reference type, if there are no
2225/// errors. Otherwise, returns a NULL type.
2226QualType 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", 2230, __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", 2230, __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);

// In WebAssembly, references to reference types are illegal.
if (getASTContext().getTargetInfo().getTriple().isWasm() &&
    T->isWebAssemblyReferenceType()) {
  Diag(Loc, diag::err_wasm_reference_pr) << 1;
  return QualType();
}

// Handle restrict on references.
if (LValueRef)
  return Context.getLValueReferenceType(T, SpelledAsLValue);
return Context.getRValueReferenceType(T);
2295}

2297/// Build a Read-only Pipe type.
2298///
2299/// \param T The type to which we'll be building a Pipe.
2300///
2301/// \param Loc We do not use it for now.
2302///
2303/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2304/// NULL type.
2305QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
return Context.getReadPipeType(T);
2307}

2309/// Build a Write-only Pipe type.
2310///
2311/// \param T The type to which we'll be building a Pipe.
2312///
2313/// \param Loc We do not use it for now.
2314///
2315/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2316/// NULL type.
2317QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
return Context.getWritePipeType(T);
2319}

2321/// Build a bit-precise integer type.
2322///
2323/// \param IsUnsigned Boolean representing the signedness of the type.
2324///
2325/// \param BitWidth Size of this int type in bits, or an expression representing
2326/// that.
2327///
2328/// \param Loc Location of the keyword.
2329QualType 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);
2360}

2362/// Check whether the specified array bound can be evaluated using the relevant
2363/// language rules. If so, returns the possibly-converted expression and sets
2364/// SizeVal to the size. If not, but the expression might be a VLA bound,
2365/// returns ExprResult(). Otherwise, produces a diagnostic and returns
2366/// ExprError().
2367static 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;
2418}

2420bool 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;
2435}

2437/// Build an array type.
2438///
2439/// \param T The type of each element in the array.
2440///
2441/// \param ASM C99 array size modifier (e.g., '*', 'static').
2442///
2443/// \param ArraySize Expression describing the size of the array.
2444///
2445/// \param Brackets The range from the opening '[' to the closing ']'.
2446///
2447/// \param Entity The name of the entity that involves the array
2448/// type, if known.
2449///
2450/// \returns A suitable array type, if there are no errors. Otherwise,
2451/// returns a NULL type.
2452QualType 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.
  bool IsCUDADevice = (getLangOpts().CUDA && getLangOpts().CUDAIsDevice);
  targetDiag(Loc,
             IsCUDADevice ? diag::err_cuda_vla : diag::err_vla_unsupported)
      << (IsCUDADevice ? CurrentCUDATarget() : 0);
}

// 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;
2672}

2674QualType 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() &&
11
←
Assuming the condition is false→
12
←
Taking false branch→
     (!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()) {
13
←
Taking true branch→
  unsigned NumBits = CurType->getAs<BitIntType>()->getNumBits();
14
←
Assuming the object is not a 'const class clang::BitIntType *'→
15
←
Called C++ object pointer is null
  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);

std::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);
2743}

2745/// Build an ext-vector type.
2746///
2747/// Run the required checks for the extended vector type.
2748QualType 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()) {
  std::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);
2806}

2808QualType 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", 2811, __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", 2811, __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);

std::optional<llvm::APSInt> ValueRows =
    NumRows->getIntegerConstantExpr(Context);
std::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);
2882}

2884bool 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;

if (T.getAddressSpace() != LangAS::Default && getLangOpts().HLSL)
  return true;
return false;
2920}

2922/// Check the extended parameter information.  Most of the necessary
2923/// checking should occur when applying the parameter attribute; the
2924/// only other checks required are positional restrictions.
2925static 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", 2928, __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"
, 2983);
}
2985}

2987QualType 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);
3031}

3033/// Build a member pointer type \c T Class::*.
3034///
3035/// \param T the type to which the member pointer refers.
3036/// \param Class the class type into which the member pointer points.
3037/// \param Loc the location where this type begins
3038/// \param Entity the name of the entity that will have this member pointer type
3039///
3040/// \returns a member pointer type, if successful, or a NULL type if there was
3041/// an error.
3042QualType 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());
3092}

3094/// Build a block pointer type.
3095///
3096/// \param T The type to which we'll be building a block pointer.
3097///
3098/// \param Loc The source location, used for diagnostics.
3099///
3100/// \param Entity The name of the entity that involves the block pointer
3101/// type, if known.
3102///
3103/// \returns A suitable block pointer type, if there are no
3104/// errors. Otherwise, returns a NULL type.
3105QualType 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);
3120}

3122QualType 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;
3137}

3139static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
                                          Qualifiers::ObjCLifetime ownership,
                                          unsigned chunkIndex);

3143/// Given that this is the declaration of a parameter under ARC,
3144/// attempt to infer attributes and such for pointer-to-whatever
3145/// types.
3146static 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?
3240}

3242void 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];
3290}

3292// Diagnose pointless type qualifiers on the return type of a function.
3293static 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", 3342);
}

// 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());
3361}

3363static std::pair<QualType, TypeSourceInfo *>
3364InventTemplateParameter(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};
3458}

3460static TypeSourceInfo *
3461GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
                             QualType T, TypeSourceInfo *ReturnTypeInfo);

3464static 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", 3575, __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"
, 3594);
      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().CPlusPlus23 && 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", 3699, __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", 3699, __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", 3737);
    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", 3792, __extension__ __PRETTY_FUNCTION__
));
return T;
3794}

3796/// Produce an appropriate diagnostic for an ambiguity between a function
3797/// declarator and a C++ direct-initializer.
3798static 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", 3801, __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);
  }
}
3891}

3893/// Produce an appropriate diagnostic for a declarator with top-level
3894/// parentheses.
3895static 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", 3898, __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", 3898, __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);
4008}

4010/// Helper for figuring out the default CC for a function declarator type.  If
4011/// this is the outermost chunk, then we can determine the CC from the
4012/// declarator context.  If not, then this could be either a member function
4013/// type or normal function type.
4014static 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", 4017, __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"
, 4064, __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;
4106}

4108namespace {
/// A simple notion of pointer kinds, which matches up with the various
/// pointer declarators.
enum class SimplePointerKind {
  Pointer,
  BlockPointer,
  MemberPointer,
  Array,
};
4117} // end anonymous namespace

4119IdentifierInfo *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", 4141);
4142}

4144/// Retrieve the identifier "NSError".
4145IdentifierInfo *Sema::getNSErrorIdent() {
if (!Ident_NSError)
  Ident_NSError = PP.getIdentifierInfo("NSError");

return Ident_NSError;
4150}

4152/// Check whether there is a nullability attribute of any kind in the given
4153/// attribute list.
4154static 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;
4164}

4166namespace {
/// 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
};
4194} // end anonymous namespace

4196/// Classify the given declarator, whose type-specified is \c type, based on
4197/// what kind of pointer it refers to.
4198///
4199/// This is used to determine the default nullability.
4200static PointerDeclaratorKind
4201classifyPointerDeclarator(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;
}
4327}

4329bool 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;
4352}

4354static 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;
4389}

4391/// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
4392/// taking into account whitespace before and after.
4393template <typename DiagBuilderT>
4394static 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"
, 4397, __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);
4427}

4429static 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"
, 4433, __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);
4454}

4456/// Complains about missing nullability if the file containing \p pointerLoc
4457/// has other uses of nullability (either the keywords or the \c assume_nonnull
4458/// pragma).
4459///
4460/// If the file has \e not seen other uses of nullability, this particular
4461/// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
4462static void
4463checkNullabilityConsistency(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);
4495}

4497/// Marks that a nullability feature has been used in the file containing
4498/// \p loc.
4499///
4500/// If this file already had pointer types in it that were missing nullability,
4501/// the first such instance is retroactively diagnosed.
4502///
4503/// \sa checkNullabilityConsistency
4504static 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);
4522}

4524/// Returns true if any of the declarator chunks before \p endIndex include a
4525/// level of indirection: array, pointer, reference, or pointer-to-member.
4526///
4527/// Because declarator chunks are stored in outer-to-inner order, testing
4528/// every chunk before \p endIndex is testing all chunks that embed the current
4529/// chunk as part of their type.
4530///
4531/// It is legal to pass the result of Declarator::getNumTypeObjects() as the
4532/// end index, in which case all chunks are tested.
4533static 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;
4555}

4557static bool IsNoDerefableChunk(const DeclaratorChunk &Chunk) {
return (Chunk.Kind == DeclaratorChunk::Pointer ||
        Chunk.Kind == DeclaratorChunk::Array);
4560}

4562template<typename AttrT>
4563static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
AL.setUsedAsTypeAttr();
return ::new (Ctx) AttrT(Ctx, AL);
4566}

4568static 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"
, 4583);
4584}

4586// Diagnose whether this is a case with the multiple addr spaces.
4587// Returns true if this is an invalid case.
4588// ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4589// by qualifiers for two or more different address spaces."
4590static 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;
4603}

4605static 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.
std::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()) {
    // 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()) {
      // Weak properties cannot be nonnull, and should not complain about
      // missing nullable attributes during completeness checks.
      complainAboutMissingNullability = CAMN_No;
      if (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::Form form =
        inferNullabilityCS ? ParsedAttr::Form::ContextSensitiveKeyword()
                           : ParsedAttr::Form::Keyword(false /*IsAlignAs*/);
    ParsedAttr *nullabilityAttr = Pool.create(
        S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
        nullptr, SourceLocation(), nullptr, 0, form);

    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()) {
    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() && !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 :).

// Track if the produced type matches the structure of the declarator.
// This is used later to decide if we can fill `TypeLoc` from
// `DeclaratorChunk`s. E.g. it must be false if Clang recovers from
// an error by replacing the type with `int`.
bool AreDeclaratorChunksValid = true;
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;

    // Microsoft property fields can have multiple sizeless array chunks
    // (i.e. int x[][][]). Skip all of these except one to avoid creating
    // bad incomplete array types.
    if (chunkIndex != 0 && !ArraySize &&
        D.getDeclSpec().getAttributes().hasMSPropertyAttr()) {
      // This is a sizeless chunk. If the next is also, skip this one.
      DeclaratorChunk &NextDeclType = D.getTypeObject(chunkIndex - 1);
      if (NextDeclType.Kind == DeclaratorChunk::Array &&
          !NextDeclType.Arr.NumElts)
        break;
    }

    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);
      }
    }

    // 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);
          AreDeclaratorChunksValid = false;
        } 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);
          // FIXME: recover and fill decls in `TypeLoc`s.
          AreDeclaratorChunksValid = false;
        } 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);
            // FIXME: recover and fill decls in `TypeLoc`s.
            AreDeclaratorChunksValid = false;
          }
        } 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);
          // FIXME: recover and fill decls in `TypeLoc`s.
          AreDeclaratorChunksValid = false;
        }
        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);
      AreDeclaratorChunksValid = false;
    }

    // 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);
      } else {
        AreDeclaratorChunksValid = false;
      }

      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. We also allow it in C2x per WG14 N2975.
      if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus) {
        if (LangOpts.C2x)
          S.Diag(FTI.getEllipsisLoc(),
                 diag::warn_c17_compat_ellipsis_only_parameter);
        else 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;
        AreDeclaratorChunksValid = false;
        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", 5462, __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 (Context.isPromotableIntegerType(ParamTy)) {
            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", 5644);

      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());
    else
      AreDeclaratorChunksValid = false;

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

  // 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", 5748, __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", 5752, __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", 5803, __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, std::nullopt,
                                       /*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, std::nullopt);
    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", 5951, __extension__ __PRETTY_FUNCTION__
));
if (!AreDeclaratorChunksValid)
  return Context.getTrivialTypeSourceInfo(T);
return GetTypeSourceInfoForDeclarator(state, T, TInfo);
5955}

5957/// GetTypeForDeclarator - Convert the type for the specified
5958/// declarator to Type instances.
5959///
5960/// The result of this call will never be null, but the associated
5961/// type may be a null type if there's an unrecoverable error.
5962TypeSourceInfo *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);
5974}

5976static 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);
}