/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp

Bug Summary

File:	tools/clang/lib/Sema/SemaDeclAttr.cpp
Warning:	line 4119, column 53 Potential leak of memory pointed to by field 'DiagStorage'

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaDeclAttr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -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 -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn325118/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-02-14-150435-17243-1 -x c++ /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp

/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp

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1//===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements decl-related attribute processing.
11//
12//===----------------------------------------------------------------------===//

14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/CXXInheritance.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/Expr.h"
22#include "clang/AST/ExprCXX.h"
23#include "clang/AST/Mangle.h"
24#include "clang/AST/RecursiveASTVisitor.h"
25#include "clang/Basic/CharInfo.h"
26#include "clang/Basic/SourceManager.h"
27#include "clang/Basic/TargetInfo.h"
28#include "clang/Lex/Preprocessor.h"
29#include "clang/Sema/DeclSpec.h"
30#include "clang/Sema/DelayedDiagnostic.h"
31#include "clang/Sema/Initialization.h"
32#include "clang/Sema/Lookup.h"
33#include "clang/Sema/Scope.h"
34#include "clang/Sema/SemaInternal.h"
35#include "llvm/ADT/STLExtras.h"
36#include "llvm/ADT/StringExtras.h"
37#include "llvm/Support/MathExtras.h"

39using namespace clang;
40using namespace sema;

42namespace AttributeLangSupport {
enum LANG {
  C,
  Cpp,
  ObjC
};
48} // end namespace AttributeLangSupport

50//===----------------------------------------------------------------------===//
51//  Helper functions
52//===----------------------------------------------------------------------===//

54/// isFunctionOrMethod - Return true if the given decl has function
55/// type (function or function-typed variable) or an Objective-C
56/// method.
57static bool isFunctionOrMethod(const Decl *D) {
return (D->getFunctionType() != nullptr) || isa<ObjCMethodDecl>(D);
59}

61/// \brief Return true if the given decl has function type (function or
62/// function-typed variable) or an Objective-C method or a block.
63static bool isFunctionOrMethodOrBlock(const Decl *D) {
return isFunctionOrMethod(D) || isa<BlockDecl>(D);
65}

67/// Return true if the given decl has a declarator that should have
68/// been processed by Sema::GetTypeForDeclarator.
69static bool hasDeclarator(const Decl *D) {
// In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) ||
       isa<ObjCPropertyDecl>(D);
73}

75/// hasFunctionProto - Return true if the given decl has a argument
76/// information. This decl should have already passed
77/// isFunctionOrMethod or isFunctionOrMethodOrBlock.
78static bool hasFunctionProto(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
  return isa<FunctionProtoType>(FnTy);
return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
82}

84/// getFunctionOrMethodNumParams - Return number of function or method
85/// parameters. It is an error to call this on a K&R function (use
86/// hasFunctionProto first).
87static unsigned getFunctionOrMethodNumParams(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
  return cast<FunctionProtoType>(FnTy)->getNumParams();
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
  return BD->getNumParams();
return cast<ObjCMethodDecl>(D)->param_size();
93}

95static QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
if (const FunctionType *FnTy = D->getFunctionType())
  return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
  return BD->getParamDecl(Idx)->getType();

return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType();
102}

104static SourceRange getFunctionOrMethodParamRange(const Decl *D, unsigned Idx) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
  return FD->getParamDecl(Idx)->getSourceRange();
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
  return MD->parameters()[Idx]->getSourceRange();
if (const auto *BD = dyn_cast<BlockDecl>(D))
  return BD->getParamDecl(Idx)->getSourceRange();
return SourceRange();
112}

114static QualType getFunctionOrMethodResultType(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
  return cast<FunctionType>(FnTy)->getReturnType();
return cast<ObjCMethodDecl>(D)->getReturnType();
118}

120static SourceRange getFunctionOrMethodResultSourceRange(const Decl *D) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
  return FD->getReturnTypeSourceRange();
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
  return MD->getReturnTypeSourceRange();
return SourceRange();
126}

128static bool isFunctionOrMethodVariadic(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType()) {
  const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy);
  return proto->isVariadic();
}
if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
  return BD->isVariadic();

return cast<ObjCMethodDecl>(D)->isVariadic();
137}

139static bool isInstanceMethod(const Decl *D) {
if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D))
  return MethodDecl->isInstance();
return false;
143}

145static inline bool isNSStringType(QualType T, ASTContext &Ctx) {
const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>();
if (!PT)
  return false;

ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface();
if (!Cls)
  return false;

IdentifierInfo* ClsName = Cls->getIdentifier();

// FIXME: Should we walk the chain of classes?
return ClsName == &Ctx.Idents.get("NSString") ||
       ClsName == &Ctx.Idents.get("NSMutableString");
159}

161static inline bool isCFStringType(QualType T, ASTContext &Ctx) {
const PointerType *PT = T->getAs<PointerType>();
if (!PT)
  return false;

const RecordType *RT = PT->getPointeeType()->getAs<RecordType>();
if (!RT)
  return false;

const RecordDecl *RD = RT->getDecl();
if (RD->getTagKind() != TTK_Struct)
  return false;

return RD->getIdentifier() == &Ctx.Idents.get("__CFString");
175}

177static unsigned getNumAttributeArgs(const AttributeList &Attr) {
// FIXME: Include the type in the argument list.
return Attr.getNumArgs() + Attr.hasParsedType();
180}

182template <typename Compare>
183static bool checkAttributeNumArgsImpl(Sema &S, const AttributeList &Attr,
                                    unsigned Num, unsigned Diag,
                                    Compare Comp) {
if (Comp(getNumAttributeArgs(Attr), Num)) {
  S.Diag(Attr.getLoc(), Diag) << Attr.getName() << Num;
  return false;
}

return true;
192}

194/// \brief Check if the attribute has exactly as many args as Num. May
195/// output an error.
196static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr,
                                unsigned Num) {
return checkAttributeNumArgsImpl(S, Attr, Num,
                                 diag::err_attribute_wrong_number_arguments,
                                 std::not_equal_to<unsigned>());
201}

203/// \brief Check if the attribute has at least as many args as Num. May
204/// output an error.
205static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr,
                                       unsigned Num) {
return checkAttributeNumArgsImpl(S, Attr, Num,
                                 diag::err_attribute_too_few_arguments,
                                 std::less<unsigned>());
210}

212/// \brief Check if the attribute has at most as many args as Num. May
213/// output an error.
214static bool checkAttributeAtMostNumArgs(Sema &S, const AttributeList &Attr,
                                       unsigned Num) {
return checkAttributeNumArgsImpl(S, Attr, Num,
                                 diag::err_attribute_too_many_arguments,
                                 std::greater<unsigned>());
219}

221/// \brief A helper function to provide Attribute Location for the Attr types
222/// AND the AttributeList.
223template <typename AttrInfo>
224static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
                             SourceLocation>::type
226getAttrLoc(const AttrInfo &Attr) {
return Attr.getLocation();
228}
229static SourceLocation getAttrLoc(const clang::AttributeList &Attr) {
return Attr.getLoc();
231}

233/// \brief A helper function to provide Attribute Name for the Attr types
234/// AND the AttributeList.
235template <typename AttrInfo>
236static typename std::enable_if<std::is_base_of<clang::Attr, AttrInfo>::value,
                             const AttrInfo *>::type
238getAttrName(const AttrInfo &Attr) {
return &Attr;
240}
241static const IdentifierInfo *getAttrName(const clang::AttributeList &Attr) {
return Attr.getName();
243}

245/// \brief If Expr is a valid integer constant, get the value of the integer
246/// expression and return success or failure. May output an error.
247template<typename AttrInfo>
248static bool checkUInt32Argument(Sema &S, const AttrInfo& Attr, const Expr *Expr,
                              uint32_t &Val, unsigned Idx = UINT_MAX(2147483647 *2U +1U)) {
llvm::APSInt I(32);
if (Expr->isTypeDependent() || Expr->isValueDependent() ||
    !Expr->isIntegerConstantExpr(I, S.Context)) {
  if (Idx != UINT_MAX(2147483647 *2U +1U))
    S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
      << getAttrName(Attr) << Idx << AANT_ArgumentIntegerConstant
      << Expr->getSourceRange();
  else
    S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_type)
      << getAttrName(Attr) << AANT_ArgumentIntegerConstant
      << Expr->getSourceRange();
  return false;
}

if (!I.isIntN(32)) {
  S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
      << I.toString(10, false) << 32 << /* Unsigned */ 1;
  return false;
}

Val = (uint32_t)I.getZExtValue();
return true;
272}

274/// \brief Wrapper around checkUInt32Argument, with an extra check to be sure
275/// that the result will fit into a regular (signed) int. All args have the same
276/// purpose as they do in checkUInt32Argument.
277template<typename AttrInfo>
278static bool checkPositiveIntArgument(Sema &S, const AttrInfo& Attr, const Expr *Expr,
                                   int &Val, unsigned Idx = UINT_MAX(2147483647 *2U +1U)) {
uint32_t UVal;
if (!checkUInt32Argument(S, Attr, Expr, UVal, Idx))
  return false;

if (UVal > (uint32_t)std::numeric_limits<int>::max()) {
  llvm::APSInt I(32); // for toString
  I = UVal;
  S.Diag(Expr->getExprLoc(), diag::err_ice_too_large)
      << I.toString(10, false) << 32 << /* Unsigned */ 0;
  return false;
}

Val = UVal;
return true;
294}

296/// \brief Diagnose mutually exclusive attributes when present on a given
297/// declaration. Returns true if diagnosed.
298template <typename AttrTy>
299static bool checkAttrMutualExclusion(Sema &S, Decl *D, SourceRange Range,
                                   IdentifierInfo *Ident) {
if (AttrTy *A = D->getAttr<AttrTy>()) {
  S.Diag(Range.getBegin(), diag::err_attributes_are_not_compatible) << Ident
                                                                    << A;
  S.Diag(A->getLocation(), diag::note_conflicting_attribute);
  return true;
}
return false;
308}

310/// \brief Check if IdxExpr is a valid parameter index for a function or
311/// instance method D.  May output an error.
312///
313/// \returns true if IdxExpr is a valid index.
314template <typename AttrInfo>
315static bool checkFunctionOrMethodParameterIndex(
  Sema &S, const Decl *D, const AttrInfo &Attr, unsigned AttrArgNum,
  const Expr *IdxExpr, uint64_t &Idx, bool AllowImplicitThis = false) {
assert(isFunctionOrMethodOrBlock(D))(static_cast <bool> (isFunctionOrMethodOrBlock(D)) ? void
 (0) : __assert_fail ("isFunctionOrMethodOrBlock(D)", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 318, __extension__ __PRETTY_FUNCTION__));

// In C++ the implicit 'this' function parameter also counts.
// Parameters are counted from one.
bool HP = hasFunctionProto(D);
bool HasImplicitThisParam = isInstanceMethod(D);
bool IV = HP && isFunctionOrMethodVariadic(D);
unsigned NumParams =
    (HP ? getFunctionOrMethodNumParams(D) : 0) + HasImplicitThisParam;

llvm::APSInt IdxInt;
if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() ||
    !IdxExpr->isIntegerConstantExpr(IdxInt, S.Context)) {
  S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_n_type)
    << getAttrName(Attr) << AttrArgNum << AANT_ArgumentIntegerConstant
    << IdxExpr->getSourceRange();
  return false;
}

Idx = IdxInt.getLimitedValue();
if (Idx < 1 || (!IV && Idx > NumParams)) {
  S.Diag(getAttrLoc(Attr), diag::err_attribute_argument_out_of_bounds)
    << getAttrName(Attr) << AttrArgNum << IdxExpr->getSourceRange();
  return false;
}
Idx--; // Convert to zero-based.
if (HasImplicitThisParam && !AllowImplicitThis) {
  if (Idx == 0) {
    S.Diag(getAttrLoc(Attr),
           diag::err_attribute_invalid_implicit_this_argument)
      << getAttrName(Attr) << IdxExpr->getSourceRange();
    return false;
  }
  --Idx;
}

return true;
355}

357/// \brief Check if the argument \p ArgNum of \p Attr is a ASCII string literal.
358/// If not emit an error and return false. If the argument is an identifier it
359/// will emit an error with a fixit hint and treat it as if it was a string
360/// literal.
361bool Sema::checkStringLiteralArgumentAttr(const AttributeList &Attr,
                                        unsigned ArgNum, StringRef &Str,
                                        SourceLocation *ArgLocation) {
// Look for identifiers. If we have one emit a hint to fix it to a literal.
if (Attr.isArgIdent(ArgNum)) {
  IdentifierLoc *Loc = Attr.getArgAsIdent(ArgNum);
  Diag(Loc->Loc, diag::err_attribute_argument_type)
      << Attr.getName() << AANT_ArgumentString
      << FixItHint::CreateInsertion(Loc->Loc, "\"")
      << FixItHint::CreateInsertion(getLocForEndOfToken(Loc->Loc), "\"");
  Str = Loc->Ident->getName();
  if (ArgLocation)
    *ArgLocation = Loc->Loc;
  return true;
}

// Now check for an actual string literal.
Expr *ArgExpr = Attr.getArgAsExpr(ArgNum);
StringLiteral *Literal = dyn_cast<StringLiteral>(ArgExpr->IgnoreParenCasts());
if (ArgLocation)
  *ArgLocation = ArgExpr->getLocStart();

if (!Literal || !Literal->isAscii()) {
  Diag(ArgExpr->getLocStart(), diag::err_attribute_argument_type)
      << Attr.getName() << AANT_ArgumentString;
  return false;
}

Str = Literal->getString();
return true;
391}

393/// \brief Applies the given attribute to the Decl without performing any
394/// additional semantic checking.
395template <typename AttrType>
396static void handleSimpleAttribute(Sema &S, Decl *D,
                                const AttributeList &Attr) {
D->addAttr(::new (S.Context) AttrType(Attr.getRange(), S.Context,
                                      Attr.getAttributeSpellingListIndex()));
400}

402template <typename AttrType>
403static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
                                              const AttributeList &Attr) {
handleSimpleAttribute<AttrType>(S, D, Attr);
406}

408/// \brief Applies the given attribute to the Decl so long as the Decl doesn't
409/// already have one of the given incompatible attributes.
410template <typename AttrType, typename IncompatibleAttrType,
        typename... IncompatibleAttrTypes>
412static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
                                              const AttributeList &Attr) {
if (checkAttrMutualExclusion<IncompatibleAttrType>(S, D, Attr.getRange(),
                                                   Attr.getName()))
  return;
handleSimpleAttributeWithExclusions<AttrType, IncompatibleAttrTypes...>(S, D,
                                                                        Attr);
419}

421/// \brief Check if the passed-in expression is of type int or bool.
422static bool isIntOrBool(Expr *Exp) {
QualType QT = Exp->getType();
return QT->isBooleanType() || QT->isIntegerType();
425}


428// Check to see if the type is a smart pointer of some kind.  We assume
429// it's a smart pointer if it defines both operator-> and operator*.
430static bool threadSafetyCheckIsSmartPointer(Sema &S, const RecordType* RT) {
DeclContextLookupResult Res1 = RT->getDecl()->lookup(
    S.Context.DeclarationNames.getCXXOperatorName(OO_Star));
if (Res1.empty())
  return false;

DeclContextLookupResult Res2 = RT->getDecl()->lookup(
    S.Context.DeclarationNames.getCXXOperatorName(OO_Arrow));
if (Res2.empty())
  return false;

return true;
442}

444/// \brief Check if passed in Decl is a pointer type.
445/// Note that this function may produce an error message.
446/// \return true if the Decl is a pointer type; false otherwise
447static bool threadSafetyCheckIsPointer(Sema &S, const Decl *D,
                                     const AttributeList &Attr) {
const ValueDecl *vd = cast<ValueDecl>(D);
QualType QT = vd->getType();
if (QT->isAnyPointerType())
  return true;

if (const RecordType *RT = QT->getAs<RecordType>()) {
  // If it's an incomplete type, it could be a smart pointer; skip it.
  // (We don't want to force template instantiation if we can avoid it,
  // since that would alter the order in which templates are instantiated.)
  if (RT->isIncompleteType())
    return true;

  if (threadSafetyCheckIsSmartPointer(S, RT))
    return true;
}

S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_pointer)
  << Attr.getName() << QT;
return false;
468}

470/// \brief Checks that the passed in QualType either is of RecordType or points
471/// to RecordType. Returns the relevant RecordType, null if it does not exit.
472static const RecordType *getRecordType(QualType QT) {
if (const RecordType *RT = QT->getAs<RecordType>())
  return RT;

// Now check if we point to record type.
if (const PointerType *PT = QT->getAs<PointerType>())
  return PT->getPointeeType()->getAs<RecordType>();

return nullptr;
481}

483static bool checkRecordTypeForCapability(Sema &S, QualType Ty) {
const RecordType *RT = getRecordType(Ty);

if (!RT)
  return false;

// Don't check for the capability if the class hasn't been defined yet.
if (RT->isIncompleteType())
  return true;

// Allow smart pointers to be used as capability objects.
// FIXME -- Check the type that the smart pointer points to.
if (threadSafetyCheckIsSmartPointer(S, RT))
  return true;

// Check if the record itself has a capability.
RecordDecl *RD = RT->getDecl();
if (RD->hasAttr<CapabilityAttr>())
  return true;

// Else check if any base classes have a capability.
if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
  CXXBasePaths BPaths(false, false);
  if (CRD->lookupInBases([](const CXXBaseSpecifier *BS, CXXBasePath &) {
        const auto *Type = BS->getType()->getAs<RecordType>();
        return Type->getDecl()->hasAttr<CapabilityAttr>();
      }, BPaths))
    return true;
}
return false;
513}

515static bool checkTypedefTypeForCapability(QualType Ty) {
const auto *TD = Ty->getAs<TypedefType>();
if (!TD)
  return false;

TypedefNameDecl *TN = TD->getDecl();
if (!TN)
  return false;

return TN->hasAttr<CapabilityAttr>();
525}

527static bool typeHasCapability(Sema &S, QualType Ty) {
if (checkTypedefTypeForCapability(Ty))
  return true;

if (checkRecordTypeForCapability(S, Ty))
  return true;

return false;
535}

537static bool isCapabilityExpr(Sema &S, const Expr *Ex) {
// Capability expressions are simple expressions involving the boolean logic
// operators &&, || or !, a simple DeclRefExpr, CastExpr or a ParenExpr. Once
// a DeclRefExpr is found, its type should be checked to determine whether it
// is a capability or not.

if (const auto *E = dyn_cast<CastExpr>(Ex))
  return isCapabilityExpr(S, E->getSubExpr());
else if (const auto *E = dyn_cast<ParenExpr>(Ex))
  return isCapabilityExpr(S, E->getSubExpr());
else if (const auto *E = dyn_cast<UnaryOperator>(Ex)) {
  if (E->getOpcode() == UO_LNot || E->getOpcode() == UO_AddrOf ||
      E->getOpcode() == UO_Deref)
    return isCapabilityExpr(S, E->getSubExpr());
  return false;
} else if (const auto *E = dyn_cast<BinaryOperator>(Ex)) {
  if (E->getOpcode() == BO_LAnd || E->getOpcode() == BO_LOr)
    return isCapabilityExpr(S, E->getLHS()) &&
           isCapabilityExpr(S, E->getRHS());
  return false;
}

return typeHasCapability(S, Ex->getType());
560}

562/// \brief Checks that all attribute arguments, starting from Sidx, resolve to
563/// a capability object.
564/// \param Sidx The attribute argument index to start checking with.
565/// \param ParamIdxOk Whether an argument can be indexing into a function
566/// parameter list.
567static void checkAttrArgsAreCapabilityObjs(Sema &S, Decl *D,
                                         const AttributeList &Attr,
                                         SmallVectorImpl<Expr *> &Args,
                                         int Sidx = 0,
                                         bool ParamIdxOk = false) {
for (unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) {
  Expr *ArgExp = Attr.getArgAsExpr(Idx);

  if (ArgExp->isTypeDependent()) {
    // FIXME -- need to check this again on template instantiation
    Args.push_back(ArgExp);
    continue;
  }

  if (StringLiteral *StrLit = dyn_cast<StringLiteral>(ArgExp)) {
    if (StrLit->getLength() == 0 ||
        (StrLit->isAscii() && StrLit->getString() == StringRef("*"))) {
      // Pass empty strings to the analyzer without warnings.
      // Treat "*" as the universal lock.
      Args.push_back(ArgExp);
      continue;
    }

    // We allow constant strings to be used as a placeholder for expressions
    // that are not valid C++ syntax, but warn that they are ignored.
    S.Diag(Attr.getLoc(), diag::warn_thread_attribute_ignored) <<
      Attr.getName();
    Args.push_back(ArgExp);
    continue;
  }

  QualType ArgTy = ArgExp->getType();

  // A pointer to member expression of the form  &MyClass::mu is treated
  // specially -- we need to look at the type of the member.
  if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(ArgExp))
    if (UOp->getOpcode() == UO_AddrOf)
      if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UOp->getSubExpr()))
        if (DRE->getDecl()->isCXXInstanceMember())
          ArgTy = DRE->getDecl()->getType();

  // First see if we can just cast to record type, or pointer to record type.
  const RecordType *RT = getRecordType(ArgTy);

  // Now check if we index into a record type function param.
  if(!RT && ParamIdxOk) {
    FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
    IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp);
    if(FD && IL) {
      unsigned int NumParams = FD->getNumParams();
      llvm::APInt ArgValue = IL->getValue();
      uint64_t ParamIdxFromOne = ArgValue.getZExtValue();
      uint64_t ParamIdxFromZero = ParamIdxFromOne - 1;
      if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) {
        S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range)
          << Attr.getName() << Idx + 1 << NumParams;
        continue;
      }
      ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType();
    }
  }

  // If the type does not have a capability, see if the components of the
  // expression have capabilities. This allows for writing C code where the
  // capability may be on the type, and the expression is a capability
  // boolean logic expression. Eg) requires_capability(A || B && !C)
  if (!typeHasCapability(S, ArgTy) && !isCapabilityExpr(S, ArgExp))
    S.Diag(Attr.getLoc(), diag::warn_thread_attribute_argument_not_lockable)
        << Attr.getName() << ArgTy;

  Args.push_back(ArgExp);
}
639}

641//===----------------------------------------------------------------------===//
642// Attribute Implementations
643//===----------------------------------------------------------------------===//

645static void handlePtGuardedVarAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (!threadSafetyCheckIsPointer(S, D, Attr))
  return;

D->addAttr(::new (S.Context)
           PtGuardedVarAttr(Attr.getRange(), S.Context,
                            Attr.getAttributeSpellingListIndex()));
653}

655static bool checkGuardedByAttrCommon(Sema &S, Decl *D,
                                   const AttributeList &Attr,
                                   Expr* &Arg) {
SmallVector<Expr*, 1> Args;
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size != 1)
  return false;

Arg = Args[0];

return true;
668}

670static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *Arg = nullptr;
if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
  return;

D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg,
                                      Attr.getAttributeSpellingListIndex()));
677}

679static void handlePtGuardedByAttr(Sema &S, Decl *D,
                                const AttributeList &Attr) {
Expr *Arg = nullptr;
if (!checkGuardedByAttrCommon(S, D, Attr, Arg))
  return;

if (!threadSafetyCheckIsPointer(S, D, Attr))
  return;

D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(),
                                             S.Context, Arg,
                                      Attr.getAttributeSpellingListIndex()));
691}

693static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D,
                                      const AttributeList &Attr,
                                      SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return false;

// Check that this attribute only applies to lockable types.
QualType QT = cast<ValueDecl>(D)->getType();
if (!QT->isDependentType() && !typeHasCapability(S, QT)) {
  S.Diag(Attr.getLoc(), diag::warn_thread_attribute_decl_not_lockable)
    << Attr.getName();
  return false;
}

// Check that all arguments are lockable objects.
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
if (Args.empty())
  return false;

return true;
713}

715static void handleAcquiredAfterAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
  return;

Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
           AcquiredAfterAttr(Attr.getRange(), S.Context,
                             StartArg, Args.size(),
                             Attr.getAttributeSpellingListIndex()));
726}

728static void handleAcquiredBeforeAttr(Sema &S, Decl *D,
                                   const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkAcquireOrderAttrCommon(S, D, Attr, Args))
  return;

Expr **StartArg = &Args[0];
D->addAttr(::new (S.Context)
           AcquiredBeforeAttr(Attr.getRange(), S.Context,
                              StartArg, Args.size(),
                              Attr.getAttributeSpellingListIndex()));
739}

741static bool checkLockFunAttrCommon(Sema &S, Decl *D,
                                 const AttributeList &Attr,
                                 SmallVectorImpl<Expr *> &Args) {
// zero or more arguments ok
// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true);

return true;
749}

751static void handleAssertSharedLockAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
  return;

unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? nullptr : &Args[0];
D->addAttr(::new (S.Context)
           AssertSharedLockAttr(Attr.getRange(), S.Context, StartArg, Size,
                                Attr.getAttributeSpellingListIndex()));
762}

764static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
                                        const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
  return;

unsigned Size = Args.size();
Expr **StartArg = Size == 0 ? nullptr : &Args[0];
D->addAttr(::new (S.Context)
           AssertExclusiveLockAttr(Attr.getRange(), S.Context,
                                   StartArg, Size,
                                   Attr.getAttributeSpellingListIndex()));
776}

778/// \brief Checks to be sure that the given parameter number is in bounds, and is
779/// an integral type. Will emit appropriate diagnostics if this returns
780/// false.
781///
782/// FuncParamNo is expected to be from the user, so is base-1. AttrArgNo is used
783/// to actually retrieve the argument, so it's base-0.
784template <typename AttrInfo>
785static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
                                  const AttrInfo &Attr, Expr *AttrArg,
                                  unsigned FuncParamNo, unsigned AttrArgNo,
                                  bool AllowDependentType = false) {
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, FD, Attr, FuncParamNo, AttrArg,
                                         Idx))
  return false;

const ParmVarDecl *Param = FD->getParamDecl(Idx);
if (AllowDependentType && Param->getType()->isDependentType())
  return true;
if (!Param->getType()->isIntegerType() && !Param->getType()->isCharType()) {
  SourceLocation SrcLoc = AttrArg->getLocStart();
  S.Diag(SrcLoc, diag::err_attribute_integers_only)
      << getAttrName(Attr) << Param->getSourceRange();
  return false;
}
return true;
804}

806/// \brief Checks to be sure that the given parameter number is in bounds, and is
807/// an integral type. Will emit appropriate diagnostics if this returns false.
808///
809/// FuncParamNo is expected to be from the user, so is base-1. AttrArgNo is used
810/// to actually retrieve the argument, so it's base-0.
811static bool checkParamIsIntegerType(Sema &S, const FunctionDecl *FD,
                                  const AttributeList &Attr,
                                  unsigned FuncParamNo, unsigned AttrArgNo,
                                  bool AllowDependentType = false) {
assert(Attr.isArgExpr(AttrArgNo) && "Expected expression argument")(static_cast <bool> (Attr.isArgExpr(AttrArgNo) &&
 "Expected expression argument") ? void (0) : __assert_fail (
"Attr.isArgExpr(AttrArgNo) && \"Expected expression argument\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 815, __extension__ __PRETTY_FUNCTION__));
return checkParamIsIntegerType(S, FD, Attr, Attr.getArgAsExpr(AttrArgNo),
                               FuncParamNo, AttrArgNo, AllowDependentType);
818}

820static void handleAllocSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
    !checkAttributeAtMostNumArgs(S, Attr, 2))
  return;

const auto *FD = cast<FunctionDecl>(D);
if (!FD->getReturnType()->isPointerType()) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
      << Attr.getName();
  return;
}

const Expr *SizeExpr = Attr.getArgAsExpr(0);
int SizeArgNo;
// Parameter indices are 1-indexed, hence Index=1
if (!checkPositiveIntArgument(S, Attr, SizeExpr, SizeArgNo, /*Index=*/1))
  return;

if (!checkParamIsIntegerType(S, FD, Attr, SizeArgNo, /*AttrArgNo=*/0))
  return;

// Args are 1-indexed, so 0 implies that the arg was not present
int NumberArgNo = 0;
if (Attr.getNumArgs() == 2) {
  const Expr *NumberExpr = Attr.getArgAsExpr(1);
  // Parameter indices are 1-based, hence Index=2
  if (!checkPositiveIntArgument(S, Attr, NumberExpr, NumberArgNo,
                                /*Index=*/2))
    return;

  if (!checkParamIsIntegerType(S, FD, Attr, NumberArgNo, /*AttrArgNo=*/1))
    return;
}

D->addAttr(::new (S.Context) AllocSizeAttr(
    Attr.getRange(), S.Context, SizeArgNo, NumberArgNo,
    Attr.getAttributeSpellingListIndex()));
857}

859static bool checkTryLockFunAttrCommon(Sema &S, Decl *D,
                                    const AttributeList &Attr,
                                    SmallVectorImpl<Expr *> &Args) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return false;

if (!isIntOrBool(Attr.getArgAsExpr(0))) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << 1 << AANT_ArgumentIntOrBool;
  return false;
}

// check that all arguments are lockable objects
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 1);

return true;
875}

877static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
                                          const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
  return;

D->addAttr(::new (S.Context)
           SharedTrylockFunctionAttr(Attr.getRange(), S.Context,
                                     Attr.getArgAsExpr(0),
                                     Args.data(), Args.size(),
                                     Attr.getAttributeSpellingListIndex()));
888}

890static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
                                             const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
  return;

D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(
    Attr.getRange(), S.Context, Attr.getArgAsExpr(0), Args.data(),
    Args.size(), Attr.getAttributeSpellingListIndex()));
899}

901static void handleLockReturnedAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
// check that the argument is lockable object
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size == 0)
  return;

D->addAttr(::new (S.Context)
           LockReturnedAttr(Attr.getRange(), S.Context, Args[0],
                            Attr.getAttributeSpellingListIndex()));
913}

915static void handleLocksExcludedAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

// check that all arguments are lockable objects
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
unsigned Size = Args.size();
if (Size == 0)
  return;
Expr **StartArg = &Args[0];

D->addAttr(::new (S.Context)
           LocksExcludedAttr(Attr.getRange(), S.Context, StartArg, Size,
                             Attr.getAttributeSpellingListIndex()));
931}

933static bool checkFunctionConditionAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr,
                                     Expr *&Cond, StringRef &Msg) {
Cond = Attr.getArgAsExpr(0);
if (!Cond->isTypeDependent()) {
  ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
  if (Converted.isInvalid())
    return false;
  Cond = Converted.get();
}

if (!S.checkStringLiteralArgumentAttr(Attr, 1, Msg))
  return false;

if (Msg.empty())
  Msg = "<no message provided>";

SmallVector<PartialDiagnosticAt, 8> Diags;
if (isa<FunctionDecl>(D) && !Cond->isValueDependent() &&
    !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(D),
                                              Diags)) {
  S.Diag(Attr.getLoc(), diag::err_attr_cond_never_constant_expr)
      << Attr.getName();
  for (const PartialDiagnosticAt &PDiag : Diags)
    S.Diag(PDiag.first, PDiag.second);
  return false;
}
return true;
961}

963static void handleEnableIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
S.Diag(Attr.getLoc(), diag::ext_clang_enable_if);

Expr *Cond;
StringRef Msg;
if (checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
  D->addAttr(::new (S.Context)
                 EnableIfAttr(Attr.getRange(), S.Context, Cond, Msg,
                              Attr.getAttributeSpellingListIndex()));
972}

974namespace {
975/// Determines if a given Expr references any of the given function's
976/// ParmVarDecls, or the function's implicit `this` parameter (if applicable).
977class ArgumentDependenceChecker
  : public RecursiveASTVisitor<ArgumentDependenceChecker> {
979#ifndef NDEBUG
const CXXRecordDecl *ClassType;
981#endif
llvm::SmallPtrSet<const ParmVarDecl *, 16> Parms;
bool Result;

985public:
ArgumentDependenceChecker(const FunctionDecl *FD) {
987#ifndef NDEBUG
  if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
    ClassType = MD->getParent();
  else
    ClassType = nullptr;
992#endif
  Parms.insert(FD->param_begin(), FD->param_end());
}

bool referencesArgs(Expr *E) {
  Result = false;
  TraverseStmt(E);
  return Result;
}

bool VisitCXXThisExpr(CXXThisExpr *E) {
  assert(E->getType()->getPointeeCXXRecordDecl() == ClassType &&(static_cast <bool> (E->getType()->getPointeeCXXRecordDecl
() == ClassType && "`this` doesn't refer to the enclosing class?"
) ? void (0) : __assert_fail ("E->getType()->getPointeeCXXRecordDecl() == ClassType && \"`this` doesn't refer to the enclosing class?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 1004, __extension__ __PRETTY_FUNCTION__))
         "`this` doesn't refer to the enclosing class?")(static_cast <bool> (E->getType()->getPointeeCXXRecordDecl
() == ClassType && "`this` doesn't refer to the enclosing class?"
) ? void (0) : __assert_fail ("E->getType()->getPointeeCXXRecordDecl() == ClassType && \"`this` doesn't refer to the enclosing class?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 1004, __extension__ __PRETTY_FUNCTION__));
  Result = true;
  return false;
}

bool VisitDeclRefExpr(DeclRefExpr *DRE) {
  if (const auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
    if (Parms.count(PVD)) {
      Result = true;
      return false;
    }
  return true;
}
1017};
1018}

1020static void handleDiagnoseIfAttr(Sema &S, Decl *D, const AttributeList &Attr) {
S.Diag(Attr.getLoc(), diag::ext_clang_diagnose_if);

Expr *Cond;
StringRef Msg;
if (!checkFunctionConditionAttr(S, D, Attr, Cond, Msg))
  return;

StringRef DiagTypeStr;
if (!S.checkStringLiteralArgumentAttr(Attr, 2, DiagTypeStr))
  return;

DiagnoseIfAttr::DiagnosticType DiagType;
if (!DiagnoseIfAttr::ConvertStrToDiagnosticType(DiagTypeStr, DiagType)) {
  S.Diag(Attr.getArgAsExpr(2)->getLocStart(),
         diag::err_diagnose_if_invalid_diagnostic_type);
  return;
}

bool ArgDependent = false;
if (const auto *FD = dyn_cast<FunctionDecl>(D))
  ArgDependent = ArgumentDependenceChecker(FD).referencesArgs(Cond);
D->addAttr(::new (S.Context) DiagnoseIfAttr(
    Attr.getRange(), S.Context, Cond, Msg, DiagType, ArgDependent, cast<NamedDecl>(D),
    Attr.getAttributeSpellingListIndex()));
1045}

1047static void handlePassObjectSizeAttr(Sema &S, Decl *D,
                                   const AttributeList &Attr) {
if (D->hasAttr<PassObjectSizeAttr>()) {
  S.Diag(D->getLocStart(), diag::err_attribute_only_once_per_parameter)
      << Attr.getName();
  return;
}

Expr *E = Attr.getArgAsExpr(0);
uint32_t Type;
if (!checkUInt32Argument(S, Attr, E, Type, /*Idx=*/1))
  return;

// pass_object_size's argument is passed in as the second argument of
// __builtin_object_size. So, it has the same constraints as that second
// argument; namely, it must be in the range [0, 3].
if (Type > 3) {
  S.Diag(E->getLocStart(), diag::err_attribute_argument_outof_range)
      << Attr.getName() << 0 << 3 << E->getSourceRange();
  return;
}

// pass_object_size is only supported on constant pointer parameters; as a
// kindness to users, we allow the parameter to be non-const for declarations.
// At this point, we have no clue if `D` belongs to a function declaration or
// definition, so we defer the constness check until later.
if (!cast<ParmVarDecl>(D)->getType()->isPointerType()) {
  S.Diag(D->getLocStart(), diag::err_attribute_pointers_only)
      << Attr.getName() << 1;
  return;
}

D->addAttr(::new (S.Context)
               PassObjectSizeAttr(Attr.getRange(), S.Context, (int)Type,
                                  Attr.getAttributeSpellingListIndex()));
1082}

1084static void handleConsumableAttr(Sema &S, Decl *D, const AttributeList &Attr) {
ConsumableAttr::ConsumedState DefaultState;

if (Attr.isArgIdent(0)) {
  IdentifierLoc *IL = Attr.getArgAsIdent(0);
  if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
                                                 DefaultState)) {
    S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << IL->Ident;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
      << Attr.getName() << AANT_ArgumentIdentifier;
  return;
}

D->addAttr(::new (S.Context)
           ConsumableAttr(Attr.getRange(), S.Context, DefaultState,
                          Attr.getAttributeSpellingListIndex()));
1104}

1106static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
                                      const AttributeList &Attr) {
ASTContext &CurrContext = S.getASTContext();
QualType ThisType = MD->getThisType(CurrContext)->getPointeeType();

if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
  if (!RD->hasAttr<ConsumableAttr>()) {
    S.Diag(Attr.getLoc(), diag::warn_attr_on_unconsumable_class) <<
      RD->getNameAsString();
    
    return false;
  }
}

return true;
1121}

1123static void handleCallableWhenAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
  return;

SmallVector<CallableWhenAttr::ConsumedState, 3> States;
for (unsigned ArgIndex = 0; ArgIndex < Attr.getNumArgs(); ++ArgIndex) {
  CallableWhenAttr::ConsumedState CallableState;
  
  StringRef StateString;
  SourceLocation Loc;
  if (Attr.isArgIdent(ArgIndex)) {
    IdentifierLoc *Ident = Attr.getArgAsIdent(ArgIndex);
    StateString = Ident->Ident->getName();
    Loc = Ident->Loc;
  } else {
    if (!S.checkStringLiteralArgumentAttr(Attr, ArgIndex, StateString, &Loc))
      return;
  }

  if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
                                                   CallableState)) {
    S.Diag(Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << StateString;
    return;
  }
    
  States.push_back(CallableState);
}

D->addAttr(::new (S.Context)
           CallableWhenAttr(Attr.getRange(), S.Context, States.data(),
             States.size(), Attr.getAttributeSpellingListIndex()));
1159}

1161static void handleParamTypestateAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
ParamTypestateAttr::ConsumedState ParamState;

if (Attr.isArgIdent(0)) {
  IdentifierLoc *Ident = Attr.getArgAsIdent(0);
  StringRef StateString = Ident->Ident->getName();

  if (!ParamTypestateAttr::ConvertStrToConsumedState(StateString,
                                                     ParamState)) {
    S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << StateString;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
    Attr.getName() << AANT_ArgumentIdentifier;
  return;
}

// FIXME: This check is currently being done in the analysis.  It can be
//        enabled here only after the parser propagates attributes at
//        template specialization definition, not declaration.
//QualType ReturnType = cast<ParmVarDecl>(D)->getType();
//const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
//
//if (!RD || !RD->hasAttr<ConsumableAttr>()) {
//    S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
//      ReturnType.getAsString();
//    return;
//}

D->addAttr(::new (S.Context)
           ParamTypestateAttr(Attr.getRange(), S.Context, ParamState,
                              Attr.getAttributeSpellingListIndex()));
1196}

1198static void handleReturnTypestateAttr(Sema &S, Decl *D,
                                    const AttributeList &Attr) {
ReturnTypestateAttr::ConsumedState ReturnState;

if (Attr.isArgIdent(0)) {
  IdentifierLoc *IL = Attr.getArgAsIdent(0);
  if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
                                                      ReturnState)) {
    S.Diag(IL->Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << IL->Ident;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
    Attr.getName() << AANT_ArgumentIdentifier;
  return;
}

// FIXME: This check is currently being done in the analysis.  It can be
//        enabled here only after the parser propagates attributes at
//        template specialization definition, not declaration.
//QualType ReturnType;
//
//if (const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D)) {
//  ReturnType = Param->getType();
//
//} else if (const CXXConstructorDecl *Constructor =
//             dyn_cast<CXXConstructorDecl>(D)) {
//  ReturnType = Constructor->getThisType(S.getASTContext())->getPointeeType();
//  
//} else {
//  
//  ReturnType = cast<FunctionDecl>(D)->getCallResultType();
//}
//
//const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
//
//if (!RD || !RD->hasAttr<ConsumableAttr>()) {
//    S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
//      ReturnType.getAsString();
//    return;
//}

D->addAttr(::new (S.Context)
           ReturnTypestateAttr(Attr.getRange(), S.Context, ReturnState,
                               Attr.getAttributeSpellingListIndex()));
1244}

1246static void handleSetTypestateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
  return;

SetTypestateAttr::ConsumedState NewState;
if (Attr.isArgIdent(0)) {
  IdentifierLoc *Ident = Attr.getArgAsIdent(0);
  StringRef Param = Ident->Ident->getName();
  if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
    S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << Param;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
    Attr.getName() << AANT_ArgumentIdentifier;
  return;
}

D->addAttr(::new (S.Context)
           SetTypestateAttr(Attr.getRange(), S.Context, NewState,
                            Attr.getAttributeSpellingListIndex()));
1268}

1270static void handleTestTypestateAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), Attr))
  return;

TestTypestateAttr::ConsumedState TestState;  
if (Attr.isArgIdent(0)) {
  IdentifierLoc *Ident = Attr.getArgAsIdent(0);
  StringRef Param = Ident->Ident->getName();
  if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
    S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported)
      << Attr.getName() << Param;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) <<
    Attr.getName() << AANT_ArgumentIdentifier;
  return;
}

D->addAttr(::new (S.Context)
           TestTypestateAttr(Attr.getRange(), S.Context, TestState,
                              Attr.getAttributeSpellingListIndex()));
1293}

1295static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D,
                                  const AttributeList &Attr) {
// Remember this typedef decl, we will need it later for diagnostics.
S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
1299}

1301static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (TagDecl *TD = dyn_cast<TagDecl>(D))
  TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context,
                                      Attr.getAttributeSpellingListIndex()));
else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
  bool BitfieldByteAligned = (!FD->getType()->isDependentType() &&
                              !FD->getType()->isIncompleteType() &&
                              FD->isBitField() &&
                              S.Context.getTypeAlign(FD->getType()) <= 8);

  if (S.getASTContext().getTargetInfo().getTriple().isPS4()) {
    if (BitfieldByteAligned)
      // The PS4 target needs to maintain ABI backwards compatibility.
      S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
        << Attr.getName() << FD->getType();
    else
      FD->addAttr(::new (S.Context) PackedAttr(
                  Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  } else {
    // Report warning about changed offset in the newer compiler versions.
    if (BitfieldByteAligned)
      S.Diag(Attr.getLoc(), diag::warn_attribute_packed_for_bitfield);

    FD->addAttr(::new (S.Context) PackedAttr(
                Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  }

} else
  S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
1330}

1332static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) {
// The IBOutlet/IBOutletCollection attributes only apply to instance
// variables or properties of Objective-C classes.  The outlet must also
// have an object reference type.
if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) {
  if (!VD->getType()->getAs<ObjCObjectPointerType>()) {
    S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
      << Attr.getName() << VD->getType() << 0;
    return false;
  }
}
else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
  if (!PD->getType()->getAs<ObjCObjectPointerType>()) {
    S.Diag(Attr.getLoc(), diag::warn_iboutlet_object_type)
      << Attr.getName() << PD->getType() << 1;
    return false;
  }
}
else {
  S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName();
  return false;
}

return true;
1356}

1358static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkIBOutletCommon(S, D, Attr))
  return;

D->addAttr(::new (S.Context)
           IBOutletAttr(Attr.getRange(), S.Context,
                        Attr.getAttributeSpellingListIndex()));
1365}

1367static void handleIBOutletCollection(Sema &S, Decl *D,
                                   const AttributeList &Attr) {

// The iboutletcollection attribute can have zero or one arguments.
if (Attr.getNumArgs() > 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
    << Attr.getName() << 1;
  return;
}

if (!checkIBOutletCommon(S, D, Attr))
  return;

ParsedType PT;

if (Attr.hasParsedType())
  PT = Attr.getTypeArg();
else {
  PT = S.getTypeName(S.Context.Idents.get("NSObject"), Attr.getLoc(),
                     S.getScopeForContext(D->getDeclContext()->getParent()));
  if (!PT) {
    S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << "NSObject";
    return;
  }
}

TypeSourceInfo *QTLoc = nullptr;
QualType QT = S.GetTypeFromParser(PT, &QTLoc);
if (!QTLoc)
  QTLoc = S.Context.getTrivialTypeSourceInfo(QT, Attr.getLoc());

// Diagnose use of non-object type in iboutletcollection attribute.
// FIXME. Gnu attribute extension ignores use of builtin types in
// attributes. So, __attribute__((iboutletcollection(char))) will be
// treated as __attribute__((iboutletcollection())).
if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
  S.Diag(Attr.getLoc(),
         QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
                             : diag::err_iboutletcollection_type) << QT;
  return;
}

D->addAttr(::new (S.Context)
           IBOutletCollectionAttr(Attr.getRange(), S.Context, QTLoc,
                                  Attr.getAttributeSpellingListIndex()));
1412}

1414bool Sema::isValidPointerAttrType(QualType T, bool RefOkay) {
if (RefOkay) {
  if (T->isReferenceType())
    return true;
} else {
  T = T.getNonReferenceType();
}

// The nonnull attribute, and other similar attributes, can be applied to a
// transparent union that contains a pointer type.
if (const RecordType *UT = T->getAsUnionType()) {
  if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) {
    RecordDecl *UD = UT->getDecl();
    for (const auto *I : UD->fields()) {
      QualType QT = I->getType();
      if (QT->isAnyPointerType() || QT->isBlockPointerType())
        return true;
    }
  }
}

return T->isAnyPointerType() || T->isBlockPointerType();
1436}

1438static bool attrNonNullArgCheck(Sema &S, QualType T, const AttributeList &Attr,
                              SourceRange AttrParmRange,
                              SourceRange TypeRange,
                              bool isReturnValue = false) {
if (!S.isValidPointerAttrType(T)) {
  if (isReturnValue)
    S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
        << Attr.getName() << AttrParmRange << TypeRange;
  else
    S.Diag(Attr.getLoc(), diag::warn_attribute_pointers_only)
        << Attr.getName() << AttrParmRange << TypeRange << 0;
  return false;
}
return true;
1452}

1454static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) {
SmallVector<unsigned, 8> NonNullArgs;
for (unsigned I = 0; I < Attr.getNumArgs(); ++I) {
  Expr *Ex = Attr.getArgAsExpr(I);
  uint64_t Idx;
  if (!checkFunctionOrMethodParameterIndex(S, D, Attr, I + 1, Ex, Idx))
    return;

  // Is the function argument a pointer type?
  if (Idx < getFunctionOrMethodNumParams(D) &&
      !attrNonNullArgCheck(S, getFunctionOrMethodParamType(D, Idx), Attr,
                           Ex->getSourceRange(),
                           getFunctionOrMethodParamRange(D, Idx)))
    continue;

  NonNullArgs.push_back(Idx);
}

// If no arguments were specified to __attribute__((nonnull)) then all pointer
// arguments have a nonnull attribute; warn if there aren't any. Skip this
// check if the attribute came from a macro expansion or a template
// instantiation.
if (NonNullArgs.empty() && Attr.getLoc().isFileID() &&
    !S.inTemplateInstantiation()) {
  bool AnyPointers = isFunctionOrMethodVariadic(D);
  for (unsigned I = 0, E = getFunctionOrMethodNumParams(D);
       I != E && !AnyPointers; ++I) {
    QualType T = getFunctionOrMethodParamType(D, I);
    if (T->isDependentType() || S.isValidPointerAttrType(T))
      AnyPointers = true;
  }

  if (!AnyPointers)
    S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers);
}

unsigned *Start = NonNullArgs.data();
unsigned Size = NonNullArgs.size();
llvm::array_pod_sort(Start, Start + Size);
D->addAttr(::new (S.Context)
           NonNullAttr(Attr.getRange(), S.Context, Start, Size,
                       Attr.getAttributeSpellingListIndex()));
1496}

1498static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
                                     const AttributeList &Attr) {
if (Attr.getNumArgs() > 0) {
  if (D->getFunctionType()) {
    handleNonNullAttr(S, D, Attr);
  } else {
    S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
      << D->getSourceRange();
  }
  return;
}

// Is the argument a pointer type?
if (!attrNonNullArgCheck(S, D->getType(), Attr, SourceRange(),
                         D->getSourceRange()))
  return;

D->addAttr(::new (S.Context)
           NonNullAttr(Attr.getRange(), S.Context, nullptr, 0,
                       Attr.getAttributeSpellingListIndex()));
1518}

1520static void handleReturnsNonNullAttr(Sema &S, Decl *D,
                                   const AttributeList &Attr) {
QualType ResultType = getFunctionOrMethodResultType(D);
SourceRange SR = getFunctionOrMethodResultSourceRange(D);
if (!attrNonNullArgCheck(S, ResultType, Attr, SourceRange(), SR,
                         /* isReturnValue */ true))
  return;

D->addAttr(::new (S.Context)
          ReturnsNonNullAttr(Attr.getRange(), S.Context,
                             Attr.getAttributeSpellingListIndex()));
1531}

1533static void handleNoEscapeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (D->isInvalidDecl())
  return;

// noescape only applies to pointer types.
QualType T = cast<ParmVarDecl>(D)->getType();
if (!S.isValidPointerAttrType(T, /* RefOkay */ true)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_pointers_only)
      << Attr.getName() << Attr.getRange() << 0;
  return;
}

D->addAttr(::new (S.Context) NoEscapeAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1547}

1549static void handleAssumeAlignedAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
Expr *E = Attr.getArgAsExpr(0),
     *OE = Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr;
S.AddAssumeAlignedAttr(Attr.getRange(), D, E, OE,
                       Attr.getAttributeSpellingListIndex());
1555}

1557static void handleAllocAlignAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
S.AddAllocAlignAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
                    Attr.getAttributeSpellingListIndex());
1561}

1563void Sema::AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
                              Expr *OE, unsigned SpellingListIndex) {
QualType ResultType = getFunctionOrMethodResultType(D);
SourceRange SR = getFunctionOrMethodResultSourceRange(D);

AssumeAlignedAttr TmpAttr(AttrRange, Context, E, OE, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();

if (!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
  Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
    << &TmpAttr << AttrRange << SR;
  return;
}

if (!E->isValueDependent()) {
  llvm::APSInt I(64);
  if (!E->isIntegerConstantExpr(I, Context)) {
    if (OE)
      Diag(AttrLoc, diag::err_attribute_argument_n_type)
        << &TmpAttr << 1 << AANT_ArgumentIntegerConstant
        << E->getSourceRange();
    else
      Diag(AttrLoc, diag::err_attribute_argument_type)
        << &TmpAttr << AANT_ArgumentIntegerConstant
        << E->getSourceRange();
    return;
  }

  if (!I.isPowerOf2()) {
    Diag(AttrLoc, diag::err_alignment_not_power_of_two)
      << E->getSourceRange();
    return;
  }
}

if (OE) {
  if (!OE->isValueDependent()) {
    llvm::APSInt I(64);
    if (!OE->isIntegerConstantExpr(I, Context)) {
      Diag(AttrLoc, diag::err_attribute_argument_n_type)
        << &TmpAttr << 2 << AANT_ArgumentIntegerConstant
        << OE->getSourceRange();
      return;
    }
  }
}

D->addAttr(::new (Context)
          AssumeAlignedAttr(AttrRange, Context, E, OE, SpellingListIndex));
1612}

1614void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
                           unsigned SpellingListIndex) {
QualType ResultType = getFunctionOrMethodResultType(D);

AllocAlignAttr TmpAttr(AttrRange, Context, 0, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();

if (!ResultType->isDependentType() &&
    !isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
  Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
      << &TmpAttr << AttrRange << getFunctionOrMethodResultSourceRange(D);
  return;
}

uint64_t IndexVal;
const auto *FuncDecl = cast<FunctionDecl>(D);
if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
                                         /*AttrArgNo=*/1, ParamExpr,
                                         IndexVal))
  return;

QualType Ty = getFunctionOrMethodParamType(D, IndexVal);
if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
  Diag(ParamExpr->getLocStart(), diag::err_attribute_integers_only)
      << &TmpAttr << FuncDecl->getParamDecl(IndexVal)->getSourceRange();
  return;
}

// We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
// because that has corrected for the implicit this parameter, and is zero-
// based.  The attribute expects what the user wrote explicitly.
llvm::APSInt Val;
ParamExpr->EvaluateAsInt(Val, Context);

D->addAttr(::new (Context) AllocAlignAttr(
    AttrRange, Context, Val.getZExtValue(), SpellingListIndex));
1650}

1652/// Normalize the attribute, __foo__ becomes foo.
1653/// Returns true if normalization was applied.
1654static bool normalizeName(StringRef &AttrName) {
if (AttrName.size() > 4 && AttrName.startswith("__") &&
    AttrName.endswith("__")) {
  AttrName = AttrName.drop_front(2).drop_back(2);
  return true;
}
return false;
1661}

1663static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) {
// This attribute must be applied to a function declaration. The first
// argument to the attribute must be an identifier, the name of the resource,
// for example: malloc. The following arguments must be argument indexes, the
// arguments must be of integer type for Returns, otherwise of pointer type.
// The difference between Holds and Takes is that a pointer may still be used
// after being held. free() should be __attribute((ownership_takes)), whereas
// a list append function may well be __attribute((ownership_holds)).

if (!AL.isArgIdent(0)) {
  S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
    << AL.getName() << 1 << AANT_ArgumentIdentifier;
  return;
}

// Figure out our Kind.
OwnershipAttr::OwnershipKind K =
    OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0,
                  AL.getAttributeSpellingListIndex()).getOwnKind();

// Check arguments.
switch (K) {
case OwnershipAttr::Takes:
case OwnershipAttr::Holds:
  if (AL.getNumArgs() < 2) {
    S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments)
      << AL.getName() << 2;
    return;
  }
  break;
case OwnershipAttr::Returns:
  if (AL.getNumArgs() > 2) {
    S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments)
      << AL.getName() << 1;
    return;
  }
  break;
}

IdentifierInfo *Module = AL.getArgAsIdent(0)->Ident;

StringRef ModuleName = Module->getName();
if (normalizeName(ModuleName)) {
  Module = &S.PP.getIdentifierTable().get(ModuleName);
}

SmallVector<unsigned, 8> OwnershipArgs;
for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
  Expr *Ex = AL.getArgAsExpr(i);
  uint64_t Idx;
  if (!checkFunctionOrMethodParameterIndex(S, D, AL, i, Ex, Idx))
    return;

  // Is the function argument a pointer type?
  QualType T = getFunctionOrMethodParamType(D, Idx);
  int Err = -1;  // No error
  switch (K) {
    case OwnershipAttr::Takes:
    case OwnershipAttr::Holds:
      if (!T->isAnyPointerType() && !T->isBlockPointerType())
        Err = 0;
      break;
    case OwnershipAttr::Returns:
      if (!T->isIntegerType())
        Err = 1;
      break;
  }
  if (-1 != Err) {
    S.Diag(AL.getLoc(), diag::err_ownership_type) << AL.getName() << Err
      << Ex->getSourceRange();
    return;
  }

  // Check we don't have a conflict with another ownership attribute.
  for (const auto *I : D->specific_attrs<OwnershipAttr>()) {
    // Cannot have two ownership attributes of different kinds for the same
    // index.
    if (I->getOwnKind() != K && I->args_end() !=
        std::find(I->args_begin(), I->args_end(), Idx)) {
      S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
        << AL.getName() << I;
      return;
    } else if (K == OwnershipAttr::Returns &&
               I->getOwnKind() == OwnershipAttr::Returns) {
      // A returns attribute conflicts with any other returns attribute using
      // a different index. Note, diagnostic reporting is 1-based, but stored
      // argument indexes are 0-based.
      if (std::find(I->args_begin(), I->args_end(), Idx) == I->args_end()) {
        S.Diag(I->getLocation(), diag::err_ownership_returns_index_mismatch)
            << *(I->args_begin()) + 1;
        if (I->args_size())
          S.Diag(AL.getLoc(), diag::note_ownership_returns_index_mismatch)
              << (unsigned)Idx + 1 << Ex->getSourceRange();
        return;
      }
    }
  }
  OwnershipArgs.push_back(Idx);
}

unsigned* start = OwnershipArgs.data();
unsigned size = OwnershipArgs.size();
llvm::array_pod_sort(start, start + size);

D->addAttr(::new (S.Context)
           OwnershipAttr(AL.getLoc(), S.Context, Module, start, size,
                         AL.getAttributeSpellingListIndex()));
1770}

1772static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (Attr.getNumArgs() > 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
    << Attr.getName() << 1;
  return;
}

NamedDecl *nd = cast<NamedDecl>(D);

// gcc rejects
// class c {
//   static int a __attribute__((weakref ("v2")));
//   static int b() __attribute__((weakref ("f3")));
// };
// and ignores the attributes of
// void f(void) {
//   static int a __attribute__((weakref ("v2")));
// }
// we reject them
const DeclContext *Ctx = D->getDeclContext()->getRedeclContext();
if (!Ctx->isFileContext()) {
  S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context)
    << nd;
  return;
}

// The GCC manual says
//
// At present, a declaration to which `weakref' is attached can only
// be `static'.
//
// It also says
//
// Without a TARGET,
// given as an argument to `weakref' or to `alias', `weakref' is
// equivalent to `weak'.
//
// gcc 4.4.1 will accept
// int a7 __attribute__((weakref));
// as
// int a7 __attribute__((weak));
// This looks like a bug in gcc. We reject that for now. We should revisit
// it if this behaviour is actually used.

// GCC rejects
// static ((alias ("y"), weakref)).
// Should we? How to check that weakref is before or after alias?

// FIXME: it would be good for us to keep the WeakRefAttr as-written instead
// of transforming it into an AliasAttr.  The WeakRefAttr never uses the
// StringRef parameter it was given anyway.
StringRef Str;
if (Attr.getNumArgs() && S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  // GCC will accept anything as the argument of weakref. Should we
  // check for an existing decl?
  D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
                                      Attr.getAttributeSpellingListIndex()));

D->addAttr(::new (S.Context)
           WeakRefAttr(Attr.getRange(), S.Context,
                       Attr.getAttributeSpellingListIndex()));
1834}

1836static void handleIFuncAttr(Sema &S, Decl *D, const AttributeList &Attr) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  return;

// Aliases should be on declarations, not definitions.
const auto *FD = cast<FunctionDecl>(D);
if (FD->isThisDeclarationADefinition()) {
  S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 1;
  return;
}

D->addAttr(::new (S.Context) IFuncAttr(Attr.getRange(), S.Context, Str,
                                       Attr.getAttributeSpellingListIndex()));
1850}

1852static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) {
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  return;

if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
  S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin);
  return;
}
if (S.Context.getTargetInfo().getTriple().isNVPTX()) {
  S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_nvptx);
}

// Aliases should be on declarations, not definitions.
if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
  if (FD->isThisDeclarationADefinition()) {
    S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << FD << 0;
    return;
  }
} else {
  const auto *VD = cast<VarDecl>(D);
  if (VD->isThisDeclarationADefinition() && VD->isExternallyVisible()) {
    S.Diag(Attr.getLoc(), diag::err_alias_is_definition) << VD << 0;
    return;
  }
}

// FIXME: check if target symbol exists in current file

D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, Str,
                                       Attr.getAttributeSpellingListIndex()));
1883}

1885static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<HotAttr>(S, D, Attr.getRange(), Attr.getName()))
  return;

D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context,
                                      Attr.getAttributeSpellingListIndex()));
1891}

1893static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<ColdAttr>(S, D, Attr.getRange(), Attr.getName()))
  return;

D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context,
                                     Attr.getAttributeSpellingListIndex()));
1899}

1901static void handleTLSModelAttr(Sema &S, Decl *D,
                             const AttributeList &Attr) {
StringRef Model;
SourceLocation LiteralLoc;
// Check that it is a string.
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Model, &LiteralLoc))
  return;

// Check that the value.
if (Model != "global-dynamic" && Model != "local-dynamic"
    && Model != "initial-exec" && Model != "local-exec") {
  S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
  return;
}

D->addAttr(::new (S.Context)
           TLSModelAttr(Attr.getRange(), S.Context, Model,
                        Attr.getAttributeSpellingListIndex()));
1919}

1921static void handleRestrictAttr(Sema &S, Decl *D, const AttributeList &Attr) {
QualType ResultType = getFunctionOrMethodResultType(D);
if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
  D->addAttr(::new (S.Context) RestrictAttr(
      Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  return;
}

S.Diag(Attr.getLoc(), diag::warn_attribute_return_pointers_only)
    << Attr.getName() << getFunctionOrMethodResultSourceRange(D);
1931}

1933static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (S.LangOpts.CPlusPlus) {
  S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
      << Attr.getName() << AttributeLangSupport::Cpp;
  return;
}

if (CommonAttr *CA = S.mergeCommonAttr(D, Attr.getRange(), Attr.getName(),
                                       Attr.getAttributeSpellingListIndex()))
  D->addAttr(CA);
1943}

1945static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<DisableTailCallsAttr>(S, D, Attr.getRange(),
                                                   Attr.getName()))
  return;

if (Attr.isDeclspecAttribute()) {
  const auto &Triple = S.getASTContext().getTargetInfo().getTriple();
  const auto &Arch = Triple.getArch();
  if (Arch != llvm::Triple::x86 &&
      (Arch != llvm::Triple::arm && Arch != llvm::Triple::thumb)) {
    S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_on_arch)
        << Attr.getName() << Triple.getArchName();
    return;
  }
}

D->addAttr(::new (S.Context) NakedAttr(Attr.getRange(), S.Context,
                                       Attr.getAttributeSpellingListIndex()));
1963}

1965static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &Attrs) {
if (hasDeclarator(D)) return;

if (S.CheckNoReturnAttr(Attrs))
  return;

if (!isa<ObjCMethodDecl>(D)) {
  S.Diag(Attrs.getLoc(), diag::warn_attribute_wrong_decl_type)
      << Attrs.getName() << ExpectedFunctionOrMethod;
  return;
}

D->addAttr(::new (S.Context) NoReturnAttr(
    Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
1979}

1981static void handleNoCallerSavedRegsAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
if (S.CheckNoCallerSavedRegsAttr(Attr))
  return;

D->addAttr(::new (S.Context) AnyX86NoCallerSavedRegistersAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
1988}

1990bool Sema::CheckNoReturnAttr(const AttributeList &Attrs) {
if (!checkAttributeNumArgs(*this, Attrs, 0)) {
  Attrs.setInvalid();
  return true;
}

return false;
1997}

1999bool Sema::CheckNoCallerSavedRegsAttr(const AttributeList &Attr) {
// Check whether the attribute is valid on the current target.
if (!Attr.existsInTarget(Context.getTargetInfo())) {
  Diag(Attr.getLoc(), diag::warn_unknown_attribute_ignored) << Attr.getName();
  Attr.setInvalid();
  return true;
}

if (!checkAttributeNumArgs(*this, Attr, 0)) {
  Attr.setInvalid();
  return true;
}

return false;
2013}

2015static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {

// The checking path for 'noreturn' and 'analyzer_noreturn' are different
// because 'analyzer_noreturn' does not impact the type.
if (!isFunctionOrMethodOrBlock(D)) {
  ValueDecl *VD = dyn_cast<ValueDecl>(D);
  if (!VD || (!VD->getType()->isBlockPointerType() &&
              !VD->getType()->isFunctionPointerType())) {
    S.Diag(Attr.getLoc(),
           Attr.isCXX11Attribute() ? diag::err_attribute_wrong_decl_type
                                   : diag::warn_attribute_wrong_decl_type)
      << Attr.getName() << ExpectedFunctionMethodOrBlock;
    return;
  }
}

D->addAttr(::new (S.Context)
           AnalyzerNoReturnAttr(Attr.getRange(), S.Context,
                                Attr.getAttributeSpellingListIndex()));
2035}

2037// PS3 PPU-specific.
2038static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) {
2039/*
Returning a Vector Class in Registers

According to the PPU ABI specifications, a class with a single member of 
vector type is returned in memory when used as the return value of a function.
This results in inefficient code when implementing vector classes. To return
the value in a single vector register, add the vecreturn attribute to the
class definition. This attribute is also applicable to struct types.

Example:

struct Vector
{
  __vector float xyzw;
} __attribute__((vecreturn));

Vector Add(Vector lhs, Vector rhs)
{
  Vector result;
  result.xyzw = vec_add(lhs.xyzw, rhs.xyzw);
  return result; // This will be returned in a register
}
2061*/
if (VecReturnAttr *A = D->getAttr<VecReturnAttr>()) {
  S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << A;
  return;
}

RecordDecl *record = cast<RecordDecl>(D);
int count = 0;

if (!isa<CXXRecordDecl>(record)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
  return;
}

if (!cast<CXXRecordDecl>(record)->isPOD()) {
  S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record);
  return;
}

for (const auto *I : record->fields()) {
  if ((count == 1) || !I->getType()->isVectorType()) {
    S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
    return;
  }
  count++;
}

D->addAttr(::new (S.Context)
           VecReturnAttr(Attr.getRange(), S.Context,
                         Attr.getAttributeSpellingListIndex()));
2091}

2093static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
                               const AttributeList &Attr) {
if (isa<ParmVarDecl>(D)) {
  // [[carries_dependency]] can only be applied to a parameter if it is a
  // parameter of a function declaration or lambda.
  if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
    S.Diag(Attr.getLoc(),
           diag::err_carries_dependency_param_not_function_decl);
    return;
  }
}

D->addAttr(::new (S.Context) CarriesDependencyAttr(
                                 Attr.getRange(), S.Context,
                                 Attr.getAttributeSpellingListIndex()));
2108}

2110static void handleNotTailCalledAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
if (checkAttrMutualExclusion<AlwaysInlineAttr>(S, D, Attr.getRange(),
                                               Attr.getName()))
  return;

D->addAttr(::new (S.Context) NotTailCalledAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2118}

2120static void handleDisableTailCallsAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
if (checkAttrMutualExclusion<NakedAttr>(S, D, Attr.getRange(),
                                        Attr.getName()))
  return;

D->addAttr(::new (S.Context) DisableTailCallsAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2128}

2130static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
  if (VD->hasLocalStorage()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
    return;
  }
} else if (!isFunctionOrMethod(D)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedVariableOrFunction;
  return;
}

D->addAttr(::new (S.Context)
           UsedAttr(Attr.getRange(), S.Context,
                    Attr.getAttributeSpellingListIndex()));
2145}

2147static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
bool IsCXX17Attr = Attr.isCXX11Attribute() && !Attr.getScopeName();

if (IsCXX17Attr && isa<VarDecl>(D)) {
  // The C++17 spelling of this attribute cannot be applied to a static data
  // member per [dcl.attr.unused]p2.
  if (cast<VarDecl>(D)->isStaticDataMember()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
        << Attr.getName() << ExpectedForMaybeUnused;
    return;
  }
}

// If this is spelled as the standard C++17 attribute, but not in C++17, warn
// about using it as an extension.
if (!S.getLangOpts().CPlusPlus17 && IsCXX17Attr)
  S.Diag(Attr.getLoc(), diag::ext_cxx17_attr) << Attr.getName();

D->addAttr(::new (S.Context) UnusedAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
2167}

2169static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
uint32_t priority = ConstructorAttr::DefaultPriority;
if (Attr.getNumArgs() &&
    !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
  return;

D->addAttr(::new (S.Context)
           ConstructorAttr(Attr.getRange(), S.Context, priority,
                           Attr.getAttributeSpellingListIndex()));
2178}

2180static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) {
uint32_t priority = DestructorAttr::DefaultPriority;
if (Attr.getNumArgs() &&
    !checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), priority))
  return;

D->addAttr(::new (S.Context)
           DestructorAttr(Attr.getRange(), S.Context, priority,
                          Attr.getAttributeSpellingListIndex()));
2189}

2191template <typename AttrTy>
2192static void handleAttrWithMessage(Sema &S, Decl *D,
                                const AttributeList &Attr) {
// Handle the case where the attribute has a text message.
StringRef Str;
if (Attr.getNumArgs() == 1 && !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  return;

D->addAttr(::new (S.Context) AttrTy(Attr.getRange(), S.Context, Str,
                                    Attr.getAttributeSpellingListIndex()));
2201}

2203static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
                                        const AttributeList &Attr) {
if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
  S.Diag(Attr.getLoc(), diag::err_objc_attr_protocol_requires_definition)
    << Attr.getName() << Attr.getRange();
  return;
}

D->addAttr(::new (S.Context)
        ObjCExplicitProtocolImplAttr(Attr.getRange(), S.Context,
                                     Attr.getAttributeSpellingListIndex()));
2214}

2216static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
                                IdentifierInfo *Platform,
                                VersionTuple Introduced,
                                VersionTuple Deprecated,
                                VersionTuple Obsoleted) {
StringRef PlatformName
  = AvailabilityAttr::getPrettyPlatformName(Platform->getName());
if (PlatformName.empty())
  PlatformName = Platform->getName();

// Ensure that Introduced <= Deprecated <= Obsoleted (although not all
// of these steps are needed).
if (!Introduced.empty() && !Deprecated.empty() &&
    !(Introduced <= Deprecated)) {
  S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
    << 1 << PlatformName << Deprecated.getAsString()
    << 0 << Introduced.getAsString();
  return true;
}

if (!Introduced.empty() && !Obsoleted.empty() &&
    !(Introduced <= Obsoleted)) {
  S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
    << 2 << PlatformName << Obsoleted.getAsString()
    << 0 << Introduced.getAsString();
  return true;
}

if (!Deprecated.empty() && !Obsoleted.empty() &&
    !(Deprecated <= Obsoleted)) {
  S.Diag(Range.getBegin(), diag::warn_availability_version_ordering)
    << 2 << PlatformName << Obsoleted.getAsString()
    << 1 << Deprecated.getAsString();
  return true;
}

return false;
2253}

2255/// \brief Check whether the two versions match.
2256///
2257/// If either version tuple is empty, then they are assumed to match. If
2258/// \p BeforeIsOkay is true, then \p X can be less than or equal to \p Y.
2259static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
                        bool BeforeIsOkay) {
if (X.empty() || Y.empty())
  return true;

if (X == Y)
  return true;

if (BeforeIsOkay && X < Y)
  return true;

return false;
2271}

2273AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
                                            IdentifierInfo *Platform,
                                            bool Implicit,
                                            VersionTuple Introduced,
                                            VersionTuple Deprecated,
                                            VersionTuple Obsoleted,
                                            bool IsUnavailable,
                                            StringRef Message,
                                            bool IsStrict,
                                            StringRef Replacement,
                                            AvailabilityMergeKind AMK,
                                            unsigned AttrSpellingListIndex) {
VersionTuple MergedIntroduced = Introduced;
VersionTuple MergedDeprecated = Deprecated;
VersionTuple MergedObsoleted = Obsoleted;
bool FoundAny = false;
bool OverrideOrImpl = false;
switch (AMK) {
case AMK_None:
case AMK_Redeclaration:
  OverrideOrImpl = false;
  break;

case AMK_Override:
case AMK_ProtocolImplementation:
  OverrideOrImpl = true;
  break;
}

if (D->hasAttrs()) {
  AttrVec &Attrs = D->getAttrs();
  for (unsigned i = 0, e = Attrs.size(); i != e;) {
    const AvailabilityAttr *OldAA = dyn_cast<AvailabilityAttr>(Attrs[i]);
    if (!OldAA) {
      ++i;
      continue;
    }

    IdentifierInfo *OldPlatform = OldAA->getPlatform();
    if (OldPlatform != Platform) {
      ++i;
      continue;
    }

    // If there is an existing availability attribute for this platform that
    // is explicit and the new one is implicit use the explicit one and
    // discard the new implicit attribute.
    if (!OldAA->isImplicit() && Implicit) {
      return nullptr;
    }

    // If there is an existing attribute for this platform that is implicit
    // and the new attribute is explicit then erase the old one and
    // continue processing the attributes.
    if (!Implicit && OldAA->isImplicit()) {
      Attrs.erase(Attrs.begin() + i);
      --e;
      continue;
    }

    FoundAny = true;
    VersionTuple OldIntroduced = OldAA->getIntroduced();
    VersionTuple OldDeprecated = OldAA->getDeprecated();
    VersionTuple OldObsoleted = OldAA->getObsoleted();
    bool OldIsUnavailable = OldAA->getUnavailable();

    if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl) ||
        !versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl) ||
        !versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl) ||
        !(OldIsUnavailable == IsUnavailable ||
          (OverrideOrImpl && !OldIsUnavailable && IsUnavailable))) {
      if (OverrideOrImpl) {
        int Which = -1;
        VersionTuple FirstVersion;
        VersionTuple SecondVersion;
        if (!versionsMatch(OldIntroduced, Introduced, OverrideOrImpl)) {
          Which = 0;
          FirstVersion = OldIntroduced;
          SecondVersion = Introduced;
        } else if (!versionsMatch(Deprecated, OldDeprecated, OverrideOrImpl)) {
          Which = 1;
          FirstVersion = Deprecated;
          SecondVersion = OldDeprecated;
        } else if (!versionsMatch(Obsoleted, OldObsoleted, OverrideOrImpl)) {
          Which = 2;
          FirstVersion = Obsoleted;
          SecondVersion = OldObsoleted;
        }

        if (Which == -1) {
          Diag(OldAA->getLocation(),
               diag::warn_mismatched_availability_override_unavail)
            << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
            << (AMK == AMK_Override);
        } else {
          Diag(OldAA->getLocation(),
               diag::warn_mismatched_availability_override)
            << Which
            << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
            << FirstVersion.getAsString() << SecondVersion.getAsString()
            << (AMK == AMK_Override);
        }
        if (AMK == AMK_Override)
          Diag(Range.getBegin(), diag::note_overridden_method);
        else
          Diag(Range.getBegin(), diag::note_protocol_method);
      } else {
        Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
        Diag(Range.getBegin(), diag::note_previous_attribute);
      }

      Attrs.erase(Attrs.begin() + i);
      --e;
      continue;
    }

    VersionTuple MergedIntroduced2 = MergedIntroduced;
    VersionTuple MergedDeprecated2 = MergedDeprecated;
    VersionTuple MergedObsoleted2 = MergedObsoleted;

    if (MergedIntroduced2.empty())
      MergedIntroduced2 = OldIntroduced;
    if (MergedDeprecated2.empty())
      MergedDeprecated2 = OldDeprecated;
    if (MergedObsoleted2.empty())
      MergedObsoleted2 = OldObsoleted;

    if (checkAvailabilityAttr(*this, OldAA->getRange(), Platform,
                              MergedIntroduced2, MergedDeprecated2,
                              MergedObsoleted2)) {
      Attrs.erase(Attrs.begin() + i);
      --e;
      continue;
    }

    MergedIntroduced = MergedIntroduced2;
    MergedDeprecated = MergedDeprecated2;
    MergedObsoleted = MergedObsoleted2;
    ++i;
  }
}

if (FoundAny &&
    MergedIntroduced == Introduced &&
    MergedDeprecated == Deprecated &&
    MergedObsoleted == Obsoleted)
  return nullptr;

// Only create a new attribute if !OverrideOrImpl, but we want to do
// the checking.
if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
                           MergedDeprecated, MergedObsoleted) &&
    !OverrideOrImpl) {
  auto *Avail =  ::new (Context) AvailabilityAttr(Range, Context, Platform,
                                          Introduced, Deprecated,
                                          Obsoleted, IsUnavailable, Message,
                                          IsStrict, Replacement,
                                          AttrSpellingListIndex);
  Avail->setImplicit(Implicit);
  return Avail;
}
return nullptr;
2435}

2437static void handleAvailabilityAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1))
  return;
IdentifierLoc *Platform = Attr.getArgAsIdent(0);
unsigned Index = Attr.getAttributeSpellingListIndex();

IdentifierInfo *II = Platform->Ident;
if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
  S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
    << Platform->Ident;

NamedDecl *ND = dyn_cast<NamedDecl>(D);
if (!ND) // We warned about this already, so just return.
  return;

AvailabilityChange Introduced = Attr.getAvailabilityIntroduced();
AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated();
AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted();
bool IsUnavailable = Attr.getUnavailableLoc().isValid();
bool IsStrict = Attr.getStrictLoc().isValid();
StringRef Str;
if (const StringLiteral *SE =
        dyn_cast_or_null<StringLiteral>(Attr.getMessageExpr()))
  Str = SE->getString();
StringRef Replacement;
if (const StringLiteral *SE =
        dyn_cast_or_null<StringLiteral>(Attr.getReplacementExpr()))
  Replacement = SE->getString();

AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, Attr.getRange(), II,
                                                    false/*Implicit*/,
                                                    Introduced.Version,
                                                    Deprecated.Version,
                                                    Obsoleted.Version,
                                                    IsUnavailable, Str,
                                                    IsStrict, Replacement,
                                                    Sema::AMK_None,
                                                    Index);
if (NewAttr)
  D->addAttr(NewAttr);

// Transcribe "ios" to "watchos" (and add a new attribute) if the versioning
// matches before the start of the watchOS platform.
if (S.Context.getTargetInfo().getTriple().isWatchOS()) {
  IdentifierInfo *NewII = nullptr;
  if (II->getName() == "ios")
    NewII = &S.Context.Idents.get("watchos");
  else if (II->getName() == "ios_app_extension")
    NewII = &S.Context.Idents.get("watchos_app_extension");

  if (NewII) {
      auto adjustWatchOSVersion = [](VersionTuple Version) -> VersionTuple {
        if (Version.empty())
          return Version;
        auto Major = Version.getMajor();
        auto NewMajor = Major >= 9 ? Major - 7 : 0;
        if (NewMajor >= 2) {
          if (Version.getMinor().hasValue()) {
            if (Version.getSubminor().hasValue())
              return VersionTuple(NewMajor, Version.getMinor().getValue(),
                                  Version.getSubminor().getValue());
            else
              return VersionTuple(NewMajor, Version.getMinor().getValue());
          }
        }

        return VersionTuple(2, 0);
      };

      auto NewIntroduced = adjustWatchOSVersion(Introduced.Version);
      auto NewDeprecated = adjustWatchOSVersion(Deprecated.Version);
      auto NewObsoleted = adjustWatchOSVersion(Obsoleted.Version);

      AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
                                                          Attr.getRange(),
                                                          NewII,
                                                          true/*Implicit*/,
                                                          NewIntroduced,
                                                          NewDeprecated,
                                                          NewObsoleted,
                                                          IsUnavailable, Str,
                                                          IsStrict,
                                                          Replacement,
                                                          Sema::AMK_None,
                                                          Index);
      if (NewAttr)
        D->addAttr(NewAttr);
    }
} else if (S.Context.getTargetInfo().getTriple().isTvOS()) {
  // Transcribe "ios" to "tvos" (and add a new attribute) if the versioning
  // matches before the start of the tvOS platform.
  IdentifierInfo *NewII = nullptr;
  if (II->getName() == "ios")
    NewII = &S.Context.Idents.get("tvos");
  else if (II->getName() == "ios_app_extension")
    NewII = &S.Context.Idents.get("tvos_app_extension");

  if (NewII) {
      AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
                                                          Attr.getRange(),
                                                          NewII,
                                                          true/*Implicit*/,
                                                          Introduced.Version,
                                                          Deprecated.Version,
                                                          Obsoleted.Version,
                                                          IsUnavailable, Str,
                                                          IsStrict,
                                                          Replacement,
                                                          Sema::AMK_None,
                                                          Index);
      if (NewAttr)
        D->addAttr(NewAttr);
    }
}
2552}

2554static void handleExternalSourceSymbolAttr(Sema &S, Decl *D,
                                         const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;
assert(checkAttributeAtMostNumArgs(S, Attr, 3) &&(static_cast <bool> (checkAttributeAtMostNumArgs(S, Attr
, 3) && "Invalid number of arguments in an external_source_symbol attribute"
) ? void (0) : __assert_fail ("checkAttributeAtMostNumArgs(S, Attr, 3) && \"Invalid number of arguments in an external_source_symbol attribute\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 2559, __extension__ __PRETTY_FUNCTION__))
       "Invalid number of arguments in an external_source_symbol attribute")(static_cast <bool> (checkAttributeAtMostNumArgs(S, Attr
, 3) && "Invalid number of arguments in an external_source_symbol attribute"
) ? void (0) : __assert_fail ("checkAttributeAtMostNumArgs(S, Attr, 3) && \"Invalid number of arguments in an external_source_symbol attribute\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 2559, __extension__ __PRETTY_FUNCTION__));

StringRef Language;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(0)))
  Language = SE->getString();
StringRef DefinedIn;
if (const auto *SE = dyn_cast_or_null<StringLiteral>(Attr.getArgAsExpr(1)))
  DefinedIn = SE->getString();
bool IsGeneratedDeclaration = Attr.getArgAsIdent(2) != nullptr;

D->addAttr(::new (S.Context) ExternalSourceSymbolAttr(
    Attr.getRange(), S.Context, Language, DefinedIn, IsGeneratedDeclaration,
    Attr.getAttributeSpellingListIndex()));
2572}

2574template <class T>
2575static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
                            typename T::VisibilityType value,
                            unsigned attrSpellingListIndex) {
T *existingAttr = D->getAttr<T>();
if (existingAttr) {
  typename T::VisibilityType existingValue = existingAttr->getVisibility();
  if (existingValue == value)
    return nullptr;
  S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
  S.Diag(range.getBegin(), diag::note_previous_attribute);
  D->dropAttr<T>();
}
return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
2588}

2590VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
                                        VisibilityAttr::VisibilityType Vis,
                                        unsigned AttrSpellingListIndex) {
return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
                                             AttrSpellingListIndex);
2595}

2597TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
                                    TypeVisibilityAttr::VisibilityType Vis,
                                    unsigned AttrSpellingListIndex) {
return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
                                                 AttrSpellingListIndex);
2602}

2604static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr,
                               bool isTypeVisibility) {
// Visibility attributes don't mean anything on a typedef.
if (isa<TypedefNameDecl>(D)) {
  S.Diag(Attr.getRange().getBegin(), diag::warn_attribute_ignored)
    << Attr.getName();
  return;
}

// 'type_visibility' can only go on a type or namespace.
if (isTypeVisibility &&
    !(isa<TagDecl>(D) ||
      isa<ObjCInterfaceDecl>(D) ||
      isa<NamespaceDecl>(D))) {
  S.Diag(Attr.getRange().getBegin(), diag::err_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedTypeOrNamespace;
  return;
}

// Check that the argument is a string literal.
StringRef TypeStr;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, TypeStr, &LiteralLoc))
  return;

VisibilityAttr::VisibilityType type;
if (!VisibilityAttr::ConvertStrToVisibilityType(TypeStr, type)) {
  S.Diag(LiteralLoc, diag::warn_attribute_type_not_supported)
    << Attr.getName() << TypeStr;
  return;
}

// Complain about attempts to use protected visibility on targets
// (like Darwin) that don't support it.
if (type == VisibilityAttr::Protected &&
    !S.Context.getTargetInfo().hasProtectedVisibility()) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_protected_visibility);
  type = VisibilityAttr::Default;
}

unsigned Index = Attr.getAttributeSpellingListIndex();
clang::Attr *newAttr;
if (isTypeVisibility) {
  newAttr = S.mergeTypeVisibilityAttr(D, Attr.getRange(),
                                  (TypeVisibilityAttr::VisibilityType) type,
                                      Index);
} else {
  newAttr = S.mergeVisibilityAttr(D, Attr.getRange(), type, Index);
}
if (newAttr)
  D->addAttr(newAttr);
2655}

2657static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl,
                                     const AttributeList &Attr) {
ObjCMethodDecl *method = cast<ObjCMethodDecl>(decl);
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << 1 << AANT_ArgumentIdentifier;
  return;
}

IdentifierLoc *IL = Attr.getArgAsIdent(0);
ObjCMethodFamilyAttr::FamilyKind F;
if (!ObjCMethodFamilyAttr::ConvertStrToFamilyKind(IL->Ident->getName(), F)) {
  S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << Attr.getName()
    << IL->Ident;
  return;
}

if (F == ObjCMethodFamilyAttr::OMF_init &&
    !method->getReturnType()->isObjCObjectPointerType()) {
  S.Diag(method->getLocation(), diag::err_init_method_bad_return_type)
      << method->getReturnType();
  // Ignore the attribute.
  return;
}

method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(),
                                                     S.Context, F,
                                      Attr.getAttributeSpellingListIndex()));
2685}

2687static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
  QualType T = TD->getUnderlyingType();
  if (!T->isCARCBridgableType()) {
    S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
    return;
  }
}
else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) {
  QualType T = PD->getType();
  if (!T->isCARCBridgableType()) {
    S.Diag(PD->getLocation(), diag::err_nsobject_attribute);
    return;
  }
}
else {
  // It is okay to include this attribute on properties, e.g.:
  //
  //  @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
  //
  // In this case it follows tradition and suppresses an error in the above
  // case.    
  S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
}
D->addAttr(::new (S.Context)
           ObjCNSObjectAttr(Attr.getRange(), S.Context,
                            Attr.getAttributeSpellingListIndex()));
2714}

2716static void handleObjCIndependentClass(Sema &S, Decl *D, const AttributeList &Attr) {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
  QualType T = TD->getUnderlyingType();
  if (!T->isObjCObjectPointerType()) {
    S.Diag(TD->getLocation(), diag::warn_ptr_independentclass_attribute);
    return;
  }
} else {
  S.Diag(D->getLocation(), diag::warn_independentclass_attribute);
  return;
}
D->addAttr(::new (S.Context)
           ObjCIndependentClassAttr(Attr.getRange(), S.Context,
                            Attr.getAttributeSpellingListIndex()));
2730}

2732static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << 1 << AANT_ArgumentIdentifier;
  return;
}

IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
BlocksAttr::BlockType type;
if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
    << Attr.getName() << II;
  return;
}

D->addAttr(::new (S.Context)
           BlocksAttr(Attr.getRange(), S.Context, type,
                      Attr.getAttributeSpellingListIndex()));
2750}

2752static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) {
unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
if (Attr.getNumArgs() > 0) {
  Expr *E = Attr.getArgAsExpr(0);
  llvm::APSInt Idx(32);
  if (E->isTypeDependent() || E->isValueDependent() ||
      !E->isIntegerConstantExpr(Idx, S.Context)) {
    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
      << Attr.getName() << 1 << AANT_ArgumentIntegerConstant
      << E->getSourceRange();
    return;
  }

  if (Idx.isSigned() && Idx.isNegative()) {
    S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero)
      << E->getSourceRange();
    return;
  }

  sentinel = Idx.getZExtValue();
}

unsigned nullPos = (unsigned)SentinelAttr::DefaultNullPos;
if (Attr.getNumArgs() > 1) {
  Expr *E = Attr.getArgAsExpr(1);
  llvm::APSInt Idx(32);
  if (E->isTypeDependent() || E->isValueDependent() ||
      !E->isIntegerConstantExpr(Idx, S.Context)) {
    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
      << Attr.getName() << 2 << AANT_ArgumentIntegerConstant
      << E->getSourceRange();
    return;
  }
  nullPos = Idx.getZExtValue();

  if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) {
    // FIXME: This error message could be improved, it would be nice
    // to say what the bounds actually are.
    S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one)
      << E->getSourceRange();
    return;
  }
}

if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
  const FunctionType *FT = FD->getType()->castAs<FunctionType>();
  if (isa<FunctionNoProtoType>(FT)) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments);
    return;
  }

  if (!cast<FunctionProtoType>(FT)->isVariadic()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
    return;
  }
} else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
  if (!MD->isVariadic()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0;
    return;
  }
} else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
  if (!BD->isVariadic()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 1;
    return;
  }
} else if (const VarDecl *V = dyn_cast<VarDecl>(D)) {
  QualType Ty = V->getType();
  if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
    const FunctionType *FT = Ty->isFunctionPointerType()
     ? D->getFunctionType()
     : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
    if (!cast<FunctionProtoType>(FT)->isVariadic()) {
      int m = Ty->isFunctionPointerType() ? 0 : 1;
      S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m;
      return;
    }
  } else {
    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
      << Attr.getName() << ExpectedFunctionMethodOrBlock;
    return;
  }
} else {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedFunctionMethodOrBlock;
  return;
}
D->addAttr(::new (S.Context)
           SentinelAttr(Attr.getRange(), S.Context, sentinel, nullPos,
                        Attr.getAttributeSpellingListIndex()));
2841}

2843static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) {
if (D->getFunctionType() &&
    D->getFunctionType()->getReturnType()->isVoidType()) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
    << Attr.getName() << 0;
  return;
}
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
  if (MD->getReturnType()->isVoidType()) {
    S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method)
    << Attr.getName() << 1;
    return;
  }

// If this is spelled as the standard C++17 attribute, but not in C++17, warn
// about using it as an extension.
if (!S.getLangOpts().CPlusPlus17 && Attr.isCXX11Attribute() &&
    !Attr.getScopeName())
  S.Diag(Attr.getLoc(), diag::ext_cxx17_attr) << Attr.getName();

D->addAttr(::new (S.Context) 
           WarnUnusedResultAttr(Attr.getRange(), S.Context,
                                Attr.getAttributeSpellingListIndex()));
2866}

2868static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// weak_import only applies to variable & function declarations.
bool isDef = false;
if (!D->canBeWeakImported(isDef)) {
  if (isDef)
    S.Diag(Attr.getLoc(), diag::warn_attribute_invalid_on_definition)
      << "weak_import";
  else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
           (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
            (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
    // Nothing to warn about here.
  } else
    S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
      << Attr.getName() << ExpectedVariableOrFunction;

  return;
}

D->addAttr(::new (S.Context)
           WeakImportAttr(Attr.getRange(), S.Context,
                          Attr.getAttributeSpellingListIndex()));
2889}

2891// Handles reqd_work_group_size and work_group_size_hint.
2892template <typename WorkGroupAttr>
2893static void handleWorkGroupSize(Sema &S, Decl *D,
                              const AttributeList &Attr) {
uint32_t WGSize[3];
for (unsigned i = 0; i < 3; ++i) {
  const Expr *E = Attr.getArgAsExpr(i);
  if (!checkUInt32Argument(S, Attr, E, WGSize[i], i))
    return;
  if (WGSize[i] == 0) {
    S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
      << Attr.getName() << E->getSourceRange();
    return;
  }
}

WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
if (Existing && !(Existing->getXDim() == WGSize[0] &&
                  Existing->getYDim() == WGSize[1] &&
                  Existing->getZDim() == WGSize[2]))
  S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();

D->addAttr(::new (S.Context) WorkGroupAttr(Attr.getRange(), S.Context,
                                           WGSize[0], WGSize[1], WGSize[2],
                                     Attr.getAttributeSpellingListIndex()));
2916}

2918// Handles intel_reqd_sub_group_size.
2919static void handleSubGroupSize(Sema &S, Decl *D, const AttributeList &Attr) {
uint32_t SGSize;
const Expr *E = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(S, Attr, E, SGSize))
  return;
if (SGSize == 0) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_is_zero)
      << Attr.getName() << E->getSourceRange();
  return;
}

OpenCLIntelReqdSubGroupSizeAttr *Existing =
    D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>();
if (Existing && Existing->getSubGroupSize() != SGSize)
  S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();

D->addAttr(::new (S.Context) OpenCLIntelReqdSubGroupSizeAttr(
    Attr.getRange(), S.Context, SGSize,
    Attr.getAttributeSpellingListIndex()));
2938}

2940static void handleVecTypeHint(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.hasParsedType()) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
    << Attr.getName() << 1;
  return;
}

TypeSourceInfo *ParmTSI = nullptr;
QualType ParmType = S.GetTypeFromParser(Attr.getTypeArg(), &ParmTSI);
assert(ParmTSI && "no type source info for attribute argument")(static_cast <bool> (ParmTSI && "no type source info for attribute argument"
) ? void (0) : __assert_fail ("ParmTSI && \"no type source info for attribute argument\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 2949, __extension__ __PRETTY_FUNCTION__));

if (!ParmType->isExtVectorType() && !ParmType->isFloatingType() &&
    (ParmType->isBooleanType() ||
     !ParmType->isIntegralType(S.getASTContext()))) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_vec_type_hint)
      << ParmType;
  return;
}

if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
  if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
    S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute) << Attr.getName();
    return;
  }
}

D->addAttr(::new (S.Context) VecTypeHintAttr(Attr.getLoc(), S.Context,
                                             ParmTSI,
                                      Attr.getAttributeSpellingListIndex()));
2969}

2971SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
                                  StringRef Name,
                                  unsigned AttrSpellingListIndex) {
if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
  if (ExistingAttr->getName() == Name)
    return nullptr;
  Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section);
  Diag(Range.getBegin(), diag::note_previous_attribute);
  return nullptr;
}
return ::new (Context) SectionAttr(Range, Context, Name,
                                   AttrSpellingListIndex);
2983}

2985bool Sema::checkSectionName(SourceLocation LiteralLoc, StringRef SecName) {
std::string Error = Context.getTargetInfo().isValidSectionSpecifier(SecName);
if (!Error.empty()) {
  Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error;
  return false;
}
return true;
2992}

2994static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Make sure that there is a string literal as the sections's single
// argument.
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc))
  return;

if (!S.checkSectionName(LiteralLoc, Str))
  return;

// If the target wants to validate the section specifier, make it happen.
std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
if (!Error.empty()) {
  S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
  << Error;
  return;
}

unsigned Index = Attr.getAttributeSpellingListIndex();
SectionAttr *NewAttr = S.mergeSectionAttr(D, Attr.getRange(), Str, Index);
if (NewAttr)
  D->addAttr(NewAttr);
3017}

3019// Check for things we'd like to warn about. Multiversioning issues are
3020// handled later in the process, once we know how many exist.
3021bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
enum FirstParam { Unsupported, Duplicate };
enum SecondParam { None, Architecture };
for (auto Str : {"tune=", "fpmath="})
  if (AttrStr.find(Str) != StringRef::npos)
    return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
           << Unsupported << None << Str;

TargetAttr::ParsedTargetAttr ParsedAttrs = TargetAttr::parse(AttrStr);

if (!ParsedAttrs.Architecture.empty() &&
    !Context.getTargetInfo().isValidCPUName(ParsedAttrs.Architecture))
  return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
         << Unsupported << Architecture << ParsedAttrs.Architecture;

if (ParsedAttrs.DuplicateArchitecture)
  return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
         << Duplicate << None << "arch=";

for (const auto &Feature : ParsedAttrs.Features) {
  auto CurFeature = StringRef(Feature).drop_front(); // remove + or -.
  if (!Context.getTargetInfo().isValidFeatureName(CurFeature))
    return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
           << Unsupported << None << CurFeature;
}

return true;
3048}

3050static void handleTargetAttr(Sema &S, Decl *D, const AttributeList &Attr) {
StringRef Str;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &LiteralLoc) ||
    !S.checkTargetAttr(LiteralLoc, Str))
  return;
unsigned Index = Attr.getAttributeSpellingListIndex();
TargetAttr *NewAttr =
    ::new (S.Context) TargetAttr(Attr.getRange(), S.Context, Str, Index);
D->addAttr(NewAttr);
3060}

3062static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *E = Attr.getArgAsExpr(0);
SourceLocation Loc = E->getExprLoc();
FunctionDecl *FD = nullptr;
DeclarationNameInfo NI;

// gcc only allows for simple identifiers. Since we support more than gcc, we
// will warn the user.
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  if (DRE->hasQualifier())
    S.Diag(Loc, diag::warn_cleanup_ext);
  FD = dyn_cast<FunctionDecl>(DRE->getDecl());
  NI = DRE->getNameInfo();
  if (!FD) {
    S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 1
      << NI.getName();
    return;
  }
} else if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
  if (ULE->hasExplicitTemplateArgs())
    S.Diag(Loc, diag::warn_cleanup_ext);
  FD = S.ResolveSingleFunctionTemplateSpecialization(ULE, true);
  NI = ULE->getNameInfo();
  if (!FD) {
    S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 2
      << NI.getName();
    if (ULE->getType() == S.Context.OverloadTy)
      S.NoteAllOverloadCandidates(ULE);
    return;
  }
} else {
  S.Diag(Loc, diag::err_attribute_cleanup_arg_not_function) << 0;
  return;
}

if (FD->getNumParams() != 1) {
  S.Diag(Loc, diag::err_attribute_cleanup_func_must_take_one_arg)
    << NI.getName();
  return;
}

// We're currently more strict than GCC about what function types we accept.
// If this ever proves to be a problem it should be easy to fix.
QualType Ty = S.Context.getPointerType(cast<VarDecl>(D)->getType());
QualType ParamTy = FD->getParamDecl(0)->getType();
if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
                                 ParamTy, Ty) != Sema::Compatible) {
  S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
    << NI.getName() << ParamTy << Ty;
  return;
}

D->addAttr(::new (S.Context)
           CleanupAttr(Attr.getRange(), S.Context, FD,
                       Attr.getAttributeSpellingListIndex()));
3117}

3119static void handleEnumExtensibilityAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
      << Attr.getName() << 0 << AANT_ArgumentIdentifier;
  return;
}

EnumExtensibilityAttr::Kind ExtensibilityKind;
IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
if (!EnumExtensibilityAttr::ConvertStrToKind(II->getName(),
                                             ExtensibilityKind)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
      << Attr.getName() << II;
  return;
}

D->addAttr(::new (S.Context) EnumExtensibilityAttr(
    Attr.getRange(), S.Context, ExtensibilityKind,
    Attr.getAttributeSpellingListIndex()));
3139}

3141/// Handle __attribute__((format_arg((idx)))) attribute based on
3142/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
3143static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) {
Expr *IdxExpr = Attr.getArgAsExpr(0);
uint64_t Idx;
if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, IdxExpr, Idx))
  return;

// Make sure the format string is really a string.
QualType Ty = getFunctionOrMethodParamType(D, Idx);

bool NotNSStringTy = !isNSStringType(Ty, S.Context);
if (NotNSStringTy &&
    !isCFStringType(Ty, S.Context) &&
    (!Ty->isPointerType() ||
     !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
  S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
      << "a string type" << IdxExpr->getSourceRange()
      << getFunctionOrMethodParamRange(D, 0);
  return;
}
Ty = getFunctionOrMethodResultType(D);
if (!isNSStringType(Ty, S.Context) &&
    !isCFStringType(Ty, S.Context) &&
    (!Ty->isPointerType() ||
     !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
  S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not)
      << (NotNSStringTy ? "string type" : "NSString")
      << IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
  return;
}

// We cannot use the Idx returned from checkFunctionOrMethodParameterIndex
// because that has corrected for the implicit this parameter, and is zero-
// based.  The attribute expects what the user wrote explicitly.
llvm::APSInt Val;
IdxExpr->EvaluateAsInt(Val, S.Context);

D->addAttr(::new (S.Context)
           FormatArgAttr(Attr.getRange(), S.Context, Val.getZExtValue(),
                         Attr.getAttributeSpellingListIndex()));
3182}

3184enum FormatAttrKind {
CFStringFormat,
NSStringFormat,
StrftimeFormat,
SupportedFormat,
IgnoredFormat,
InvalidFormat
3191};

3193/// getFormatAttrKind - Map from format attribute names to supported format
3194/// types.
3195static FormatAttrKind getFormatAttrKind(StringRef Format) {
return llvm::StringSwitch<FormatAttrKind>(Format)
    // Check for formats that get handled specially.
    .Case("NSString", NSStringFormat)
    .Case("CFString", CFStringFormat)
    .Case("strftime", StrftimeFormat)

    // Otherwise, check for supported formats.
    .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
    .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
    .Case("kprintf", SupportedFormat)         // OpenBSD.
    .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
    .Case("os_trace", SupportedFormat)
    .Case("os_log", SupportedFormat)

    .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
    .Default(InvalidFormat);
3212}

3214/// Handle __attribute__((init_priority(priority))) attributes based on
3215/// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
3216static void handleInitPriorityAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (!S.getLangOpts().CPlusPlus) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
  return;
}

if (S.getCurFunctionOrMethodDecl()) {
  S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
  Attr.setInvalid();
  return;
}
QualType T = cast<VarDecl>(D)->getType();
if (S.Context.getAsArrayType(T))
  T = S.Context.getBaseElementType(T);
if (!T->getAs<RecordType>()) {
  S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr);
  Attr.setInvalid();
  return;
}

Expr *E = Attr.getArgAsExpr(0);
uint32_t prioritynum;
if (!checkUInt32Argument(S, Attr, E, prioritynum)) {
  Attr.setInvalid();
  return;
}

if (prioritynum < 101 || prioritynum > 65535) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range)
    << E->getSourceRange() << Attr.getName() << 101 << 65535;
  Attr.setInvalid();
  return;
}
D->addAttr(::new (S.Context)
           InitPriorityAttr(Attr.getRange(), S.Context, prioritynum,
                            Attr.getAttributeSpellingListIndex()));
3253}

3255FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
                                IdentifierInfo *Format, int FormatIdx,
                                int FirstArg,
                                unsigned AttrSpellingListIndex) {
// Check whether we already have an equivalent format attribute.
for (auto *F : D->specific_attrs<FormatAttr>()) {
  if (F->getType() == Format &&
      F->getFormatIdx() == FormatIdx &&
      F->getFirstArg() == FirstArg) {
    // If we don't have a valid location for this attribute, adopt the
    // location.
    if (F->getLocation().isInvalid())
      F->setRange(Range);
    return nullptr;
  }
}

return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
                                  FirstArg, AttrSpellingListIndex);
3274}

3276/// Handle __attribute__((format(type,idx,firstarg))) attributes based on
3277/// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
3278static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << 1 << AANT_ArgumentIdentifier;
  return;
}

// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
bool HasImplicitThisParam = isInstanceMethod(D);
unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;

IdentifierInfo *II = Attr.getArgAsIdent(0)->Ident;
StringRef Format = II->getName();

if (normalizeName(Format)) {
  // If we've modified the string name, we need a new identifier for it.
  II = &S.Context.Idents.get(Format);
}

// Check for supported formats.
FormatAttrKind Kind = getFormatAttrKind(Format);

if (Kind == IgnoredFormat)
  return;

if (Kind == InvalidFormat) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
    << Attr.getName() << II->getName();
  return;
}

// checks for the 2nd argument
Expr *IdxExpr = Attr.getArgAsExpr(1);
uint32_t Idx;
if (!checkUInt32Argument(S, Attr, IdxExpr, Idx, 2))
  return;

if (Idx < 1 || Idx > NumArgs) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
    << Attr.getName() << 2 << IdxExpr->getSourceRange();
  return;
}

// FIXME: Do we need to bounds check?
unsigned ArgIdx = Idx - 1;

if (HasImplicitThisParam) {
  if (ArgIdx == 0) {
    S.Diag(Attr.getLoc(),
           diag::err_format_attribute_implicit_this_format_string)
      << IdxExpr->getSourceRange();
    return;
  }
  ArgIdx--;
}

// make sure the format string is really a string
QualType Ty = getFunctionOrMethodParamType(D, ArgIdx);

if (Kind == CFStringFormat) {
  if (!isCFStringType(Ty, S.Context)) {
    S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
      << "a CFString" << IdxExpr->getSourceRange()
      << getFunctionOrMethodParamRange(D, ArgIdx);
    return;
  }
} else if (Kind == NSStringFormat) {
  // FIXME: do we need to check if the type is NSString*?  What are the
  // semantics?
  if (!isNSStringType(Ty, S.Context)) {
    S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
      << "an NSString" << IdxExpr->getSourceRange()
      << getFunctionOrMethodParamRange(D, ArgIdx);
    return;
  }
} else if (!Ty->isPointerType() ||
           !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) {
  S.Diag(Attr.getLoc(), diag::err_format_attribute_not)
    << "a string type" << IdxExpr->getSourceRange()
    << getFunctionOrMethodParamRange(D, ArgIdx);
  return;
}

// check the 3rd argument
Expr *FirstArgExpr = Attr.getArgAsExpr(2);
uint32_t FirstArg;
if (!checkUInt32Argument(S, Attr, FirstArgExpr, FirstArg, 3))
  return;

// check if the function is variadic if the 3rd argument non-zero
if (FirstArg != 0) {
  if (isFunctionOrMethodVariadic(D)) {
    ++NumArgs; // +1 for ...
  } else {
    S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic);
    return;
  }
}

// strftime requires FirstArg to be 0 because it doesn't read from any
// variable the input is just the current time + the format string.
if (Kind == StrftimeFormat) {
  if (FirstArg != 0) {
    S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter)
      << FirstArgExpr->getSourceRange();
    return;
  }
// if 0 it disables parameter checking (to use with e.g. va_list)
} else if (FirstArg != 0 && FirstArg != NumArgs) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
    << Attr.getName() << 3 << FirstArgExpr->getSourceRange();
  return;
}

FormatAttr *NewAttr = S.mergeFormatAttr(D, Attr.getRange(), II,
                                        Idx, FirstArg,
                                        Attr.getAttributeSpellingListIndex());
if (NewAttr)
  D->addAttr(NewAttr);
3398}

3400static void handleTransparentUnionAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
// Try to find the underlying union declaration.
RecordDecl *RD = nullptr;
TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
if (TD && TD->getUnderlyingType()->isUnionType())
  RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
else
  RD = dyn_cast<RecordDecl>(D);

if (!RD || !RD->isUnion()) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedUnion;
  return;
}

if (!RD->isCompleteDefinition()) {
  if (!RD->isBeingDefined())
    S.Diag(Attr.getLoc(),
           diag::warn_transparent_union_attribute_not_definition);
  return;
}

RecordDecl::field_iterator Field = RD->field_begin(),
                        FieldEnd = RD->field_end();
if (Field == FieldEnd) {
  S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields);
  return;
}

FieldDecl *FirstField = *Field;
QualType FirstType = FirstField->getType();
if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) {
  S.Diag(FirstField->getLocation(),
         diag::warn_transparent_union_attribute_floating)
    << FirstType->isVectorType() << FirstType;
  return;
}

if (FirstType->isIncompleteType())
  return;
uint64_t FirstSize = S.Context.getTypeSize(FirstType);
uint64_t FirstAlign = S.Context.getTypeAlign(FirstType);
for (; Field != FieldEnd; ++Field) {
  QualType FieldType = Field->getType();
  if (FieldType->isIncompleteType())
    return;
  // FIXME: this isn't fully correct; we also need to test whether the
  // members of the union would all have the same calling convention as the
  // first member of the union. Checking just the size and alignment isn't
  // sufficient (consider structs passed on the stack instead of in registers
  // as an example).
  if (S.Context.getTypeSize(FieldType) != FirstSize ||
      S.Context.getTypeAlign(FieldType) > FirstAlign) {
    // Warn if we drop the attribute.
    bool isSize = S.Context.getTypeSize(FieldType) != FirstSize;
    unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType)
                               : S.Context.getTypeAlign(FieldType);
    S.Diag(Field->getLocation(),
        diag::warn_transparent_union_attribute_field_size_align)
      << isSize << Field->getDeclName() << FieldBits;
    unsigned FirstBits = isSize? FirstSize : FirstAlign;
    S.Diag(FirstField->getLocation(),
           diag::note_transparent_union_first_field_size_align)
      << isSize << FirstBits;
    return;
  }
}

RD->addAttr(::new (S.Context)
            TransparentUnionAttr(Attr.getRange(), S.Context,
                                 Attr.getAttributeSpellingListIndex()));
3472}

3474static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Make sure that there is a string literal as the annotation's single
// argument.
StringRef Str;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  return;

// Don't duplicate annotations that are already set.
for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
  if (I->getAnnotation() == Str)
    return;
}

D->addAttr(::new (S.Context)
           AnnotateAttr(Attr.getRange(), S.Context, Str,
                        Attr.getAttributeSpellingListIndex()));
3490}

3492static void handleAlignValueAttr(Sema &S, Decl *D,
                               const AttributeList &Attr) {
S.AddAlignValueAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
                    Attr.getAttributeSpellingListIndex());
3496}

3498void Sema::AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
                           unsigned SpellingListIndex) {
AlignValueAttr TmpAttr(AttrRange, Context, E, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();

QualType T;
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
  T = TD->getUnderlyingType();
else if (ValueDecl *VD = dyn_cast<ValueDecl>(D))
  T = VD->getType();
else
  llvm_unreachable("Unknown decl type for align_value")::llvm::llvm_unreachable_internal("Unknown decl type for align_value"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 3509);

if (!T->isDependentType() && !T->isAnyPointerType() &&
    !T->isReferenceType() && !T->isMemberPointerType()) {
  Diag(AttrLoc, diag::warn_attribute_pointer_or_reference_only)
    << &TmpAttr /*TmpAttr.getName()*/ << T << D->getSourceRange();
  return;
}

if (!E->isValueDependent()) {
  llvm::APSInt Alignment;
  ExprResult ICE
    = VerifyIntegerConstantExpression(E, &Alignment,
        diag::err_align_value_attribute_argument_not_int,
          /*AllowFold*/ false);
  if (ICE.isInvalid())
    return;

  if (!Alignment.isPowerOf2()) {
    Diag(AttrLoc, diag::err_alignment_not_power_of_two)
      << E->getSourceRange();
    return;
  }

  D->addAttr(::new (Context)
             AlignValueAttr(AttrRange, Context, ICE.get(),
             SpellingListIndex));
  return;
}

// Save dependent expressions in the AST to be instantiated.
D->addAttr(::new (Context) AlignValueAttr(TmpAttr));
3541}

3543static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// check the attribute arguments.
if (Attr.getNumArgs() > 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
    << Attr.getName() << 1;
  return;
}

if (Attr.getNumArgs() == 0) {
  D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context,
             true, nullptr, Attr.getAttributeSpellingListIndex()));
  return;
}

Expr *E = Attr.getArgAsExpr(0);
if (Attr.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
  S.Diag(Attr.getEllipsisLoc(),
         diag::err_pack_expansion_without_parameter_packs);
  return;
}

if (!Attr.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
  return;

if (E->isValueDependent()) {
  if (const auto *TND = dyn_cast<TypedefNameDecl>(D)) {
    if (!TND->getUnderlyingType()->isDependentType()) {
      S.Diag(Attr.getLoc(), diag::err_alignment_dependent_typedef_name)
          << E->getSourceRange();
      return;
    }
  }
}

S.AddAlignedAttr(Attr.getRange(), D, E, Attr.getAttributeSpellingListIndex(),
                 Attr.isPackExpansion());
3579}

3581void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
                        unsigned SpellingListIndex, bool IsPackExpansion) {
AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
SourceLocation AttrLoc = AttrRange.getBegin();

// C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
if (TmpAttr.isAlignas()) {
  // C++11 [dcl.align]p1:
  //   An alignment-specifier may be applied to a variable or to a class
  //   data member, but it shall not be applied to a bit-field, a function
  //   parameter, the formal parameter of a catch clause, or a variable
  //   declared with the register storage class specifier. An
  //   alignment-specifier may also be applied to the declaration of a class
  //   or enumeration type.
  // C11 6.7.5/2:
  //   An alignment attribute shall not be specified in a declaration of
  //   a typedef, or a bit-field, or a function, or a parameter, or an
  //   object declared with the register storage-class specifier.
  int DiagKind = -1;
  if (isa<ParmVarDecl>(D)) {
    DiagKind = 0;
  } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
    if (VD->getStorageClass() == SC_Register)
      DiagKind = 1;
    if (VD->isExceptionVariable())
      DiagKind = 2;
  } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
    if (FD->isBitField())
      DiagKind = 3;
  } else if (!isa<TagDecl>(D)) {
    Diag(AttrLoc, diag::err_attribute_wrong_decl_type) << &TmpAttr
      << (TmpAttr.isC11() ? ExpectedVariableOrField
                          : ExpectedVariableFieldOrTag);
    return;
  }
  if (DiagKind != -1) {
    Diag(AttrLoc, diag::err_alignas_attribute_wrong_decl_type)
      << &TmpAttr << DiagKind;
    return;
  }
}

if (E->isTypeDependent() || E->isValueDependent()) {
  // Save dependent expressions in the AST to be instantiated.
  AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
  AA->setPackExpansion(IsPackExpansion);
  D->addAttr(AA);
  return;
}

// FIXME: Cache the number on the Attr object?
llvm::APSInt Alignment;
ExprResult ICE
  = VerifyIntegerConstantExpression(E, &Alignment,
      diag::err_aligned_attribute_argument_not_int,
      /*AllowFold*/ false);
if (ICE.isInvalid())
  return;

uint64_t AlignVal = Alignment.getZExtValue();

// C++11 [dcl.align]p2:
//   -- if the constant expression evaluates to zero, the alignment
//      specifier shall have no effect
// C11 6.7.5p6:
//   An alignment specification of zero has no effect.
if (!(TmpAttr.isAlignas() && !Alignment)) {
  if (!llvm::isPowerOf2_64(AlignVal)) {
    Diag(AttrLoc, diag::err_alignment_not_power_of_two)
      << E->getSourceRange();
    return;
  }
}

// Alignment calculations can wrap around if it's greater than 2**28.
unsigned MaxValidAlignment =
    Context.getTargetInfo().getTriple().isOSBinFormatCOFF() ? 8192
                                                            : 268435456;
if (AlignVal > MaxValidAlignment) {
  Diag(AttrLoc, diag::err_attribute_aligned_too_great) << MaxValidAlignment
                                                       << E->getSourceRange();
  return;
}

if (Context.getTargetInfo().isTLSSupported()) {
  unsigned MaxTLSAlign =
      Context.toCharUnitsFromBits(Context.getTargetInfo().getMaxTLSAlign())
          .getQuantity();
  auto *VD = dyn_cast<VarDecl>(D);
  if (MaxTLSAlign && AlignVal > MaxTLSAlign && VD &&
      VD->getTLSKind() != VarDecl::TLS_None) {
    Diag(VD->getLocation(), diag::err_tls_var_aligned_over_maximum)
        << (unsigned)AlignVal << VD << MaxTLSAlign;
    return;
  }
}

AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true,
                                              ICE.get(), SpellingListIndex);
AA->setPackExpansion(IsPackExpansion);
D->addAttr(AA);
3682}

3684void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS,
                        unsigned SpellingListIndex, bool IsPackExpansion) {
// FIXME: Cache the number on the Attr object if non-dependent?
// FIXME: Perform checking of type validity
AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS,
                                              SpellingListIndex);
AA->setPackExpansion(IsPackExpansion);
D->addAttr(AA);
3692}

3694void Sema::CheckAlignasUnderalignment(Decl *D) {
assert(D->hasAttrs() && "no attributes on decl")(static_cast <bool> (D->hasAttrs() && "no attributes on decl"
) ? void (0) : __assert_fail ("D->hasAttrs() && \"no attributes on decl\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 3695, __extension__ __PRETTY_FUNCTION__));

QualType UnderlyingTy, DiagTy;
if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
  UnderlyingTy = DiagTy = VD->getType();
} else {
  UnderlyingTy = DiagTy = Context.getTagDeclType(cast<TagDecl>(D));
  if (EnumDecl *ED = dyn_cast<EnumDecl>(D))
    UnderlyingTy = ED->getIntegerType();
}
if (DiagTy->isDependentType() || DiagTy->isIncompleteType())
  return;

// C++11 [dcl.align]p5, C11 6.7.5/4:
//   The combined effect of all alignment attributes in a declaration shall
//   not specify an alignment that is less strict than the alignment that
//   would otherwise be required for the entity being declared.
AlignedAttr *AlignasAttr = nullptr;
unsigned Align = 0;
for (auto *I : D->specific_attrs<AlignedAttr>()) {
  if (I->isAlignmentDependent())
    return;
  if (I->isAlignas())
    AlignasAttr = I;
  Align = std::max(Align, I->getAlignment(Context));
}

if (AlignasAttr && Align) {
  CharUnits RequestedAlign = Context.toCharUnitsFromBits(Align);
  CharUnits NaturalAlign = Context.getTypeAlignInChars(UnderlyingTy);
  if (NaturalAlign > RequestedAlign)
    Diag(AlignasAttr->getLocation(), diag::err_alignas_underaligned)
      << DiagTy << (unsigned)NaturalAlign.getQuantity();
}
3729}

3731bool Sema::checkMSInheritanceAttrOnDefinition(
  CXXRecordDecl *RD, SourceRange Range, bool BestCase,
  MSInheritanceAttr::Spelling SemanticSpelling) {
assert(RD->hasDefinition() && "RD has no definition!")(static_cast <bool> (RD->hasDefinition() && "RD has no definition!"
) ? void (0) : __assert_fail ("RD->hasDefinition() && \"RD has no definition!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 3734, __extension__ __PRETTY_FUNCTION__));

// We may not have seen base specifiers or any virtual methods yet.  We will
// have to wait until the record is defined to catch any mismatches.
if (!RD->getDefinition()->isCompleteDefinition())
  return false;

// The unspecified model never matches what a definition could need.
if (SemanticSpelling == MSInheritanceAttr::Keyword_unspecified_inheritance)
  return false;

if (BestCase) {
  if (RD->calculateInheritanceModel() == SemanticSpelling)
    return false;
} else {
  if (RD->calculateInheritanceModel() <= SemanticSpelling)
    return false;
}

Diag(Range.getBegin(), diag::err_mismatched_ms_inheritance)
    << 0 /*definition*/;
Diag(RD->getDefinition()->getLocation(), diag::note_defined_here)
    << RD->getNameAsString();
return true;
3758}

3760/// parseModeAttrArg - Parses attribute mode string and returns parsed type
3761/// attribute.
3762static void parseModeAttrArg(Sema &S, StringRef Str, unsigned &DestWidth,
                           bool &IntegerMode, bool &ComplexMode) {
IntegerMode = true;
ComplexMode = false;
switch (Str.size()) {
case 2:
  switch (Str[0]) {
  case 'Q':
    DestWidth = 8;
    break;
  case 'H':
    DestWidth = 16;
    break;
  case 'S':
    DestWidth = 32;
    break;
  case 'D':
    DestWidth = 64;
    break;
  case 'X':
    DestWidth = 96;
    break;
  case 'T':
    DestWidth = 128;
    break;
  }
  if (Str[1] == 'F') {
    IntegerMode = false;
  } else if (Str[1] == 'C') {
    IntegerMode = false;
    ComplexMode = true;
  } else if (Str[1] != 'I') {
    DestWidth = 0;
  }
  break;
case 4:
  // FIXME: glibc uses 'word' to define register_t; this is narrower than a
  // pointer on PIC16 and other embedded platforms.
  if (Str == "word")
    DestWidth = S.Context.getTargetInfo().getRegisterWidth();
  else if (Str == "byte")
    DestWidth = S.Context.getTargetInfo().getCharWidth();
  break;
case 7:
  if (Str == "pointer")
    DestWidth = S.Context.getTargetInfo().getPointerWidth(0);
  break;
case 11:
  if (Str == "unwind_word")
    DestWidth = S.Context.getTargetInfo().getUnwindWordWidth();
  break;
}
3814}

3816/// handleModeAttr - This attribute modifies the width of a decl with primitive
3817/// type.
3818///
3819/// Despite what would be logical, the mode attribute is a decl attribute, not a
3820/// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be
3821/// HImode, not an intermediate pointer.
3822static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// This attribute isn't documented, but glibc uses it.  It changes
// the width of an int or unsigned int to the specified size.
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
    << AANT_ArgumentIdentifier;
  return;
}

IdentifierInfo *Name = Attr.getArgAsIdent(0)->Ident;

S.AddModeAttr(Attr.getRange(), D, Name, Attr.getAttributeSpellingListIndex());
3834}

3836void Sema::AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
                     unsigned SpellingListIndex, bool InInstantiation) {
StringRef Str = Name->getName();
normalizeName(Str);
SourceLocation AttrLoc = AttrRange.getBegin();

unsigned DestWidth = 0;
bool IntegerMode = true;
bool ComplexMode = false;
llvm::APInt VectorSize(64, 0);
if (Str.size() >= 4 && Str[0] == 'V') {
  // Minimal length of vector mode is 4: 'V' + NUMBER(>=1) + TYPE(>=2).
  size_t StrSize = Str.size();
  size_t VectorStringLength = 0;
  while ((VectorStringLength + 1) < StrSize &&
         isdigit(Str[VectorStringLength + 1]))
    ++VectorStringLength;
  if (VectorStringLength &&
      !Str.substr(1, VectorStringLength).getAsInteger(10, VectorSize) &&
      VectorSize.isPowerOf2()) {
    parseModeAttrArg(*this, Str.substr(VectorStringLength + 1), DestWidth,
                     IntegerMode, ComplexMode);
    // Avoid duplicate warning from template instantiation.
    if (!InInstantiation)
      Diag(AttrLoc, diag::warn_vector_mode_deprecated);
  } else {
    VectorSize = 0;
  }
}

if (!VectorSize)
  parseModeAttrArg(*this, Str, DestWidth, IntegerMode, ComplexMode);

// FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t
// and friends, at least with glibc.
// FIXME: Make sure floating-point mappings are accurate
// FIXME: Support XF and TF types
if (!DestWidth) {
  Diag(AttrLoc, diag::err_machine_mode) << 0 /*Unknown*/ << Name;
  return;
}

QualType OldTy;
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
  OldTy = TD->getUnderlyingType();
else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
  // Something like 'typedef enum { X } __attribute__((mode(XX))) T;'.
  // Try to get type from enum declaration, default to int.
  OldTy = ED->getIntegerType();
  if (OldTy.isNull())
    OldTy = Context.IntTy;
} else
  OldTy = cast<ValueDecl>(D)->getType();

if (OldTy->isDependentType()) {
  D->addAttr(::new (Context)
             ModeAttr(AttrRange, Context, Name, SpellingListIndex));
  return;
}

// Base type can also be a vector type (see PR17453).
// Distinguish between base type and base element type.
QualType OldElemTy = OldTy;
if (const VectorType *VT = OldTy->getAs<VectorType>())
  OldElemTy = VT->getElementType();

// GCC allows 'mode' attribute on enumeration types (even incomplete), except
// for vector modes. So, 'enum X __attribute__((mode(QI)));' forms a complete
// type, 'enum { A } __attribute__((mode(V4SI)))' is rejected.
if ((isa<EnumDecl>(D) || OldElemTy->getAs<EnumType>()) &&
    VectorSize.getBoolValue()) {
  Diag(AttrLoc, diag::err_enum_mode_vector_type) << Name << AttrRange;
  return;
}
bool IntegralOrAnyEnumType =
    OldElemTy->isIntegralOrEnumerationType() || OldElemTy->getAs<EnumType>();

if (!OldElemTy->getAs<BuiltinType>() && !OldElemTy->isComplexType() &&
    !IntegralOrAnyEnumType)
  Diag(AttrLoc, diag::err_mode_not_primitive);
else if (IntegerMode) {
  if (!IntegralOrAnyEnumType)
    Diag(AttrLoc, diag::err_mode_wrong_type);
} else if (ComplexMode) {
  if (!OldElemTy->isComplexType())
    Diag(AttrLoc, diag::err_mode_wrong_type);
} else {
  if (!OldElemTy->isFloatingType())
    Diag(AttrLoc, diag::err_mode_wrong_type);
}

QualType NewElemTy;

if (IntegerMode)
  NewElemTy = Context.getIntTypeForBitwidth(DestWidth,
                                            OldElemTy->isSignedIntegerType());
else
  NewElemTy = Context.getRealTypeForBitwidth(DestWidth);

if (NewElemTy.isNull()) {
  Diag(AttrLoc, diag::err_machine_mode) << 1 /*Unsupported*/ << Name;
  return;
}

if (ComplexMode) {
  NewElemTy = Context.getComplexType(NewElemTy);
}

QualType NewTy = NewElemTy;
if (VectorSize.getBoolValue()) {
  NewTy = Context.getVectorType(NewTy, VectorSize.getZExtValue(),
                                VectorType::GenericVector);
} else if (const VectorType *OldVT = OldTy->getAs<VectorType>()) {
  // Complex machine mode does not support base vector types.
  if (ComplexMode) {
    Diag(AttrLoc, diag::err_complex_mode_vector_type);
    return;
  }
  unsigned NumElements = Context.getTypeSize(OldElemTy) *
                         OldVT->getNumElements() /
                         Context.getTypeSize(NewElemTy);
  NewTy =
      Context.getVectorType(NewElemTy, NumElements, OldVT->getVectorKind());
}

if (NewTy.isNull()) {
  Diag(AttrLoc, diag::err_mode_wrong_type);
  return;
}

// Install the new type.
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
  TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy);
else if (EnumDecl *ED = dyn_cast<EnumDecl>(D))
  ED->setIntegerType(NewTy);
else
  cast<ValueDecl>(D)->setType(NewTy);

D->addAttr(::new (Context)
           ModeAttr(AttrRange, Context, Name, SpellingListIndex));
3976}

3978static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) {
D->addAttr(::new (S.Context)
           NoDebugAttr(Attr.getRange(), S.Context,
                       Attr.getAttributeSpellingListIndex()));
3982}

3984AlwaysInlineAttr *Sema::mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
                                            IdentifierInfo *Ident,
                                            unsigned AttrSpellingListIndex) {
if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
  Diag(Range.getBegin(), diag::warn_attribute_ignored) << Ident;
  Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
  return nullptr;
}

if (D->hasAttr<AlwaysInlineAttr>())
  return nullptr;

return ::new (Context) AlwaysInlineAttr(Range, Context,
                                        AttrSpellingListIndex);
3998}

4000CommonAttr *Sema::mergeCommonAttr(Decl *D, SourceRange Range,
                                IdentifierInfo *Ident,
                                unsigned AttrSpellingListIndex) {
if (checkAttrMutualExclusion<InternalLinkageAttr>(*this, D, Range, Ident))
  return nullptr;

return ::new (Context) CommonAttr(Range, Context, AttrSpellingListIndex);
4007}

4009InternalLinkageAttr *
4010Sema::mergeInternalLinkageAttr(Decl *D, SourceRange Range,
                             IdentifierInfo *Ident,
                             unsigned AttrSpellingListIndex) {
if (auto VD = dyn_cast<VarDecl>(D)) {
  // Attribute applies to Var but not any subclass of it (like ParmVar,
  // ImplicitParm or VarTemplateSpecialization).
  if (VD->getKind() != Decl::Var) {
    Diag(Range.getBegin(), diag::warn_attribute_wrong_decl_type)
        << Ident << (getLangOpts().CPlusPlus ? ExpectedFunctionVariableOrClass
                                             : ExpectedVariableOrFunction);
    return nullptr;
  }
  // Attribute does not apply to non-static local variables.
  if (VD->hasLocalStorage()) {
    Diag(VD->getLocation(), diag::warn_internal_linkage_local_storage);
    return nullptr;
  }
}

if (checkAttrMutualExclusion<CommonAttr>(*this, D, Range, Ident))
  return nullptr;

return ::new (Context)
    InternalLinkageAttr(Range, Context, AttrSpellingListIndex);
4034}

4036MinSizeAttr *Sema::mergeMinSizeAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex) {
if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
  Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'minsize'";
  Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
  return nullptr;
}

if (D->hasAttr<MinSizeAttr>())
  return nullptr;

return ::new (Context) MinSizeAttr(Range, Context, AttrSpellingListIndex);
4048}

4050OptimizeNoneAttr *Sema::mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
                                            unsigned AttrSpellingListIndex) {
if (AlwaysInlineAttr *Inline = D->getAttr<AlwaysInlineAttr>()) {
  Diag(Inline->getLocation(), diag::warn_attribute_ignored) << Inline;
  Diag(Range.getBegin(), diag::note_conflicting_attribute);
  D->dropAttr<AlwaysInlineAttr>();
}
if (MinSizeAttr *MinSize = D->getAttr<MinSizeAttr>()) {
  Diag(MinSize->getLocation(), diag::warn_attribute_ignored) << MinSize;
  Diag(Range.getBegin(), diag::note_conflicting_attribute);
  D->dropAttr<MinSizeAttr>();
}

if (D->hasAttr<OptimizeNoneAttr>())
  return nullptr;

return ::new (Context) OptimizeNoneAttr(Range, Context,
                                        AttrSpellingListIndex);
4068}

4070static void handleAlwaysInlineAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (checkAttrMutualExclusion<NotTailCalledAttr>(S, D, Attr.getRange(),
                                                Attr.getName()))
  return;

if (AlwaysInlineAttr *Inline = S.mergeAlwaysInlineAttr(
        D, Attr.getRange(), Attr.getName(),
        Attr.getAttributeSpellingListIndex()))
  D->addAttr(Inline);
4080}

4082static void handleMinSizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (MinSizeAttr *MinSize = S.mergeMinSizeAttr(
        D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
  D->addAttr(MinSize);
4086}

4088static void handleOptimizeNoneAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (OptimizeNoneAttr *Optnone = S.mergeOptimizeNoneAttr(
        D, Attr.getRange(), Attr.getAttributeSpellingListIndex()))
  D->addAttr(Optnone);
4093}

4095static void handleConstantAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<CUDASharedAttr>(S, D, Attr.getRange(),
                                             Attr.getName()))
  return;
auto *VD = cast<VarDecl>(D);
if (!VD->hasGlobalStorage()) {
  S.Diag(Attr.getLoc(), diag::err_cuda_nonglobal_constant);
  return;
}
D->addAttr(::new (S.Context) CUDAConstantAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4106}

4108static void handleSharedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<CUDAConstantAttr>(S, D, Attr.getRange(),
1
Taking false branch→
                                               Attr.getName()))
  return;
auto *VD = cast<VarDecl>(D);
// extern __shared__ is only allowed on arrays with no length (e.g.
// "int x[]").
if (VD->hasExternalStorage() && !isa<IncompleteArrayType>(VD->getType())) {
2
←
Taking false branch→
  S.Diag(Attr.getLoc(), diag::err_cuda_extern_shared) << VD;
  return;
}
if (S.getLangOpts().CUDA && VD->hasLocalStorage() &&
3
←
Assuming the condition is true→
22
←
Potential leak of memory pointed to by field 'DiagStorage'
    S.CUDADiagIfHostCode(Attr.getLoc(), diag::err_cuda_host_shared)
4
←
Calling 'operator<<'→
21
←
Returned allocated memory→
        << S.CurrentCUDATarget())
  return;
D->addAttr(::new (S.Context) CUDASharedAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
4125}

4127static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (checkAttrMutualExclusion<CUDADeviceAttr>(S, D, Attr.getRange(),
                                             Attr.getName()) ||
    checkAttrMutualExclusion<CUDAHostAttr>(S, D, Attr.getRange(),
                                           Attr.getName())) {
  return;
}
FunctionDecl *FD = cast<FunctionDecl>(D);
if (!FD->getReturnType()->isVoidType()) {
  SourceRange RTRange = FD->getReturnTypeSourceRange();
  S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return)
      << FD->getType()
      << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
                            : FixItHint());
  return;
}
if (const auto *Method = dyn_cast<CXXMethodDecl>(FD)) {
  if (Method->isInstance()) {
    S.Diag(Method->getLocStart(), diag::err_kern_is_nonstatic_method)
        << Method;
    return;
  }
  S.Diag(Method->getLocStart(), diag::warn_kern_is_method) << Method;
}
// Only warn for "inline" when compiling for host, to cut down on noise.
if (FD->isInlineSpecified() && !S.getLangOpts().CUDAIsDevice)
  S.Diag(FD->getLocStart(), diag::warn_kern_is_inline) << FD;

D->addAttr(::new (S.Context)
            CUDAGlobalAttr(Attr.getRange(), S.Context,
                           Attr.getAttributeSpellingListIndex()));
4158}

4160static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
FunctionDecl *Fn = cast<FunctionDecl>(D);
if (!Fn->isInlineSpecified()) {
  S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
  return;
}

D->addAttr(::new (S.Context)
           GNUInlineAttr(Attr.getRange(), S.Context,
                         Attr.getAttributeSpellingListIndex()));
4170}

4172static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (hasDeclarator(D)) return;

// Diagnostic is emitted elsewhere: here we store the (valid) Attr
// in the Decl node for syntactic reasoning, e.g., pretty-printing.
CallingConv CC;
if (S.CheckCallingConvAttr(Attr, CC, /*FD*/nullptr))
  return;

if (!isa<ObjCMethodDecl>(D)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedFunctionOrMethod;
  return;
}

switch (Attr.getKind()) {
case AttributeList::AT_FastCall:
  D->addAttr(::new (S.Context)
             FastCallAttr(Attr.getRange(), S.Context,
                          Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_StdCall:
  D->addAttr(::new (S.Context)
             StdCallAttr(Attr.getRange(), S.Context,
                         Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_ThisCall:
  D->addAttr(::new (S.Context)
             ThisCallAttr(Attr.getRange(), S.Context,
                          Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_CDecl:
  D->addAttr(::new (S.Context)
             CDeclAttr(Attr.getRange(), S.Context,
                       Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_Pascal:
  D->addAttr(::new (S.Context)
             PascalAttr(Attr.getRange(), S.Context,
                        Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_SwiftCall:
  D->addAttr(::new (S.Context)
             SwiftCallAttr(Attr.getRange(), S.Context,
                           Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_VectorCall:
  D->addAttr(::new (S.Context)
             VectorCallAttr(Attr.getRange(), S.Context,
                            Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_MSABI:
  D->addAttr(::new (S.Context)
             MSABIAttr(Attr.getRange(), S.Context,
                       Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_SysVABI:
  D->addAttr(::new (S.Context)
             SysVABIAttr(Attr.getRange(), S.Context,
                         Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_RegCall:
  D->addAttr(::new (S.Context) RegCallAttr(
      Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_Pcs: {
  PcsAttr::PCSType PCS;
  switch (CC) {
  case CC_AAPCS:
    PCS = PcsAttr::AAPCS;
    break;
  case CC_AAPCS_VFP:
    PCS = PcsAttr::AAPCS_VFP;
    break;
  default:
    llvm_unreachable("unexpected calling convention in pcs attribute")::llvm::llvm_unreachable_internal("unexpected calling convention in pcs attribute"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4247);
  }

  D->addAttr(::new (S.Context)
             PcsAttr(Attr.getRange(), S.Context, PCS,
                     Attr.getAttributeSpellingListIndex()));
  return;
}
case AttributeList::AT_IntelOclBicc:
  D->addAttr(::new (S.Context)
             IntelOclBiccAttr(Attr.getRange(), S.Context,
                              Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_PreserveMost:
  D->addAttr(::new (S.Context) PreserveMostAttr(
      Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  return;
case AttributeList::AT_PreserveAll:
  D->addAttr(::new (S.Context) PreserveAllAttr(
      Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
  return;
default:
  llvm_unreachable("unexpected attribute kind")::llvm::llvm_unreachable_internal("unexpected attribute kind"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4269);
}
4271}

4273static void handleSuppressAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

std::vector<StringRef> DiagnosticIdentifiers;
for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
  StringRef RuleName;

  if (!S.checkStringLiteralArgumentAttr(Attr, I, RuleName, nullptr))
    return;

  // FIXME: Warn if the rule name is unknown. This is tricky because only
  // clang-tidy knows about available rules.
  DiagnosticIdentifiers.push_back(RuleName);
}
D->addAttr(::new (S.Context) SuppressAttr(
    Attr.getRange(), S.Context, DiagnosticIdentifiers.data(),
    DiagnosticIdentifiers.size(), Attr.getAttributeSpellingListIndex()));
4291}

4293bool Sema::CheckCallingConvAttr(const AttributeList &Attrs, CallingConv &CC, 
                              const FunctionDecl *FD) {
if (Attrs.isInvalid())
  return true;

if (Attrs.hasProcessingCache()) {
  CC = (CallingConv) Attrs.getProcessingCache();
  return false;
}

unsigned ReqArgs = Attrs.getKind() == AttributeList::AT_Pcs ? 1 : 0;
if (!checkAttributeNumArgs(*this, Attrs, ReqArgs)) {
  Attrs.setInvalid();
  return true;
}

// TODO: diagnose uses of these conventions on the wrong target.
switch (Attrs.getKind()) {
case AttributeList::AT_CDecl: CC = CC_C; break;
case AttributeList::AT_FastCall: CC = CC_X86FastCall; break;
case AttributeList::AT_StdCall: CC = CC_X86StdCall; break;
case AttributeList::AT_ThisCall: CC = CC_X86ThisCall; break;
case AttributeList::AT_Pascal: CC = CC_X86Pascal; break;
case AttributeList::AT_SwiftCall: CC = CC_Swift; break;
case AttributeList::AT_VectorCall: CC = CC_X86VectorCall; break;
case AttributeList::AT_RegCall: CC = CC_X86RegCall; break;
case AttributeList::AT_MSABI:
  CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_C :
                                                           CC_Win64;
  break;
case AttributeList::AT_SysVABI:
  CC = Context.getTargetInfo().getTriple().isOSWindows() ? CC_X86_64SysV :
                                                           CC_C;
  break;
case AttributeList::AT_Pcs: {
  StringRef StrRef;
  if (!checkStringLiteralArgumentAttr(Attrs, 0, StrRef)) {
    Attrs.setInvalid();
    return true;
  }
  if (StrRef == "aapcs") {
    CC = CC_AAPCS;
    break;
  } else if (StrRef == "aapcs-vfp") {
    CC = CC_AAPCS_VFP;
    break;
  }

  Attrs.setInvalid();
  Diag(Attrs.getLoc(), diag::err_invalid_pcs);
  return true;
}
case AttributeList::AT_IntelOclBicc: CC = CC_IntelOclBicc; break;
case AttributeList::AT_PreserveMost: CC = CC_PreserveMost; break;
case AttributeList::AT_PreserveAll: CC = CC_PreserveAll; break;
default: llvm_unreachable("unexpected attribute kind")::llvm::llvm_unreachable_internal("unexpected attribute kind"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4348);
}

const TargetInfo &TI = Context.getTargetInfo();
TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC);
if (A != TargetInfo::CCCR_OK) {
  if (A == TargetInfo::CCCR_Warning)
    Diag(Attrs.getLoc(), diag::warn_cconv_ignored) << Attrs.getName();

  // This convention is not valid for the target. Use the default function or
  // method calling convention.
  bool IsCXXMethod = false, IsVariadic = false;
  if (FD) {
    IsCXXMethod = FD->isCXXInstanceMember();
    IsVariadic = FD->isVariadic();
  }
  CC = Context.getDefaultCallingConvention(IsVariadic, IsCXXMethod);
}

Attrs.setProcessingCache((unsigned) CC);
return false;
4369}

4371/// Pointer-like types in the default address space.
4372static bool isValidSwiftContextType(QualType type) {
if (!type->hasPointerRepresentation())
  return type->isDependentType();
return type->getPointeeType().getAddressSpace() == LangAS::Default;
4376}

4378/// Pointers and references in the default address space.
4379static bool isValidSwiftIndirectResultType(QualType type) {
if (auto ptrType = type->getAs<PointerType>()) {
  type = ptrType->getPointeeType();
} else if (auto refType = type->getAs<ReferenceType>()) {
  type = refType->getPointeeType();
} else {
  return type->isDependentType();
}
return type.getAddressSpace() == LangAS::Default;
4388}

4390/// Pointers and references to pointers in the default address space.
4391static bool isValidSwiftErrorResultType(QualType type) {
if (auto ptrType = type->getAs<PointerType>()) {
  type = ptrType->getPointeeType();
} else if (auto refType = type->getAs<ReferenceType>()) {
  type = refType->getPointeeType();
} else {
  return type->isDependentType();
}
if (!type.getQualifiers().empty())
  return false;
return isValidSwiftContextType(type);
4402}

4404static void handleParameterABIAttr(Sema &S, Decl *D, const AttributeList &Attrs,
                                 ParameterABI Abi) {
S.AddParameterABIAttr(Attrs.getRange(), D, Abi,
                      Attrs.getAttributeSpellingListIndex());
4408}

4410void Sema::AddParameterABIAttr(SourceRange range, Decl *D, ParameterABI abi,
                             unsigned spellingIndex) {

QualType type = cast<ParmVarDecl>(D)->getType();

if (auto existingAttr = D->getAttr<ParameterABIAttr>()) {
  if (existingAttr->getABI() != abi) {
    Diag(range.getBegin(), diag::err_attributes_are_not_compatible)
      << getParameterABISpelling(abi) << existingAttr;
    Diag(existingAttr->getLocation(), diag::note_conflicting_attribute);
    return;
  }
}

switch (abi) {
case ParameterABI::Ordinary:
  llvm_unreachable("explicit attribute for ordinary parameter ABI?")::llvm::llvm_unreachable_internal("explicit attribute for ordinary parameter ABI?"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4426);

case ParameterABI::SwiftContext:
  if (!isValidSwiftContextType(type)) {
    Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
      << getParameterABISpelling(abi)
      << /*pointer to pointer */ 0 << type;
  }
  D->addAttr(::new (Context)
             SwiftContextAttr(range, Context, spellingIndex));
  return;

case ParameterABI::SwiftErrorResult:
  if (!isValidSwiftErrorResultType(type)) {
    Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
      << getParameterABISpelling(abi)
      << /*pointer to pointer */ 1 << type;
  }
  D->addAttr(::new (Context)
             SwiftErrorResultAttr(range, Context, spellingIndex));
  return;

case ParameterABI::SwiftIndirectResult:
  if (!isValidSwiftIndirectResultType(type)) {
    Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
      << getParameterABISpelling(abi)
      << /*pointer*/ 0 << type;
  }
  D->addAttr(::new (Context)
             SwiftIndirectResultAttr(range, Context, spellingIndex));
  return;
}
llvm_unreachable("bad parameter ABI attribute")::llvm::llvm_unreachable_internal("bad parameter ABI attribute"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4458);
4459}

4461/// Checks a regparm attribute, returning true if it is ill-formed and
4462/// otherwise setting numParams to the appropriate value.
4463bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) {
if (Attr.isInvalid())
  return true;

if (!checkAttributeNumArgs(*this, Attr, 1)) {
  Attr.setInvalid();
  return true;
}

uint32_t NP;
Expr *NumParamsExpr = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(*this, Attr, NumParamsExpr, NP)) {
  Attr.setInvalid();
  return true;
}

if (Context.getTargetInfo().getRegParmMax() == 0) {
  Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform)
    << NumParamsExpr->getSourceRange();
  Attr.setInvalid();
  return true;
}

numParams = NP;
if (numParams > Context.getTargetInfo().getRegParmMax()) {
  Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number)
    << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange();
  Attr.setInvalid();
  return true;
}

return false;
4495}

4497// Checks whether an argument of launch_bounds attribute is
4498// acceptable, performs implicit conversion to Rvalue, and returns
4499// non-nullptr Expr result on success. Otherwise, it returns nullptr
4500// and may output an error.
4501static Expr *makeLaunchBoundsArgExpr(Sema &S, Expr *E,
                                   const CUDALaunchBoundsAttr &Attr,
                                   const unsigned Idx) {
if (S.DiagnoseUnexpandedParameterPack(E))
  return nullptr;

// Accept template arguments for now as they depend on something else.
// We'll get to check them when they eventually get instantiated.
if (E->isValueDependent())
  return E;

llvm::APSInt I(64);
if (!E->isIntegerConstantExpr(I, S.Context)) {
  S.Diag(E->getExprLoc(), diag::err_attribute_argument_n_type)
      << &Attr << Idx << AANT_ArgumentIntegerConstant << E->getSourceRange();
  return nullptr;
}
// Make sure we can fit it in 32 bits.
if (!I.isIntN(32)) {
  S.Diag(E->getExprLoc(), diag::err_ice_too_large) << I.toString(10, false)
                                                   << 32 << /* Unsigned */ 1;
  return nullptr;
}
if (I < 0)
  S.Diag(E->getExprLoc(), diag::warn_attribute_argument_n_negative)
      << &Attr << Idx << E->getSourceRange();

// We may need to perform implicit conversion of the argument.
InitializedEntity Entity = InitializedEntity::InitializeParameter(
    S.Context, S.Context.getConstType(S.Context.IntTy), /*consume*/ false);
ExprResult ValArg = S.PerformCopyInitialization(Entity, SourceLocation(), E);
assert(!ValArg.isInvalid() &&(static_cast <bool> (!ValArg.isInvalid() && "Unexpected PerformCopyInitialization() failure."
) ? void (0) : __assert_fail ("!ValArg.isInvalid() && \"Unexpected PerformCopyInitialization() failure.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4533, __extension__ __PRETTY_FUNCTION__))
       "Unexpected PerformCopyInitialization() failure.")(static_cast <bool> (!ValArg.isInvalid() && "Unexpected PerformCopyInitialization() failure."
) ? void (0) : __assert_fail ("!ValArg.isInvalid() && \"Unexpected PerformCopyInitialization() failure.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4533, __extension__ __PRETTY_FUNCTION__));

return ValArg.getAs<Expr>();
4536}

4538void Sema::AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
                             Expr *MinBlocks, unsigned SpellingListIndex) {
CUDALaunchBoundsAttr TmpAttr(AttrRange, Context, MaxThreads, MinBlocks,
                             SpellingListIndex);
MaxThreads = makeLaunchBoundsArgExpr(*this, MaxThreads, TmpAttr, 0);
if (MaxThreads == nullptr)
  return;

if (MinBlocks) {
  MinBlocks = makeLaunchBoundsArgExpr(*this, MinBlocks, TmpAttr, 1);
  if (MinBlocks == nullptr)
    return;
}

D->addAttr(::new (Context) CUDALaunchBoundsAttr(
    AttrRange, Context, MaxThreads, MinBlocks, SpellingListIndex));
4554}

4556static void handleLaunchBoundsAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1) ||
    !checkAttributeAtMostNumArgs(S, Attr, 2))
  return;

S.AddLaunchBoundsAttr(Attr.getRange(), D, Attr.getArgAsExpr(0),
                      Attr.getNumArgs() > 1 ? Attr.getArgAsExpr(1) : nullptr,
                      Attr.getAttributeSpellingListIndex());
4565}

4567static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
                                        const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << /* arg num = */ 1 << AANT_ArgumentIdentifier;
  return;
}

if (!checkAttributeNumArgs(S, Attr, 3))
  return;

IdentifierInfo *ArgumentKind = Attr.getArgAsIdent(0)->Ident;

if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedFunctionOrMethod;
  return;
}

uint64_t ArgumentIdx;
if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 2, Attr.getArgAsExpr(1),
                                         ArgumentIdx))
  return;

uint64_t TypeTagIdx;
if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 3, Attr.getArgAsExpr(2),
                                         TypeTagIdx))
  return;

bool IsPointer = (Attr.getName()->getName() == "pointer_with_type_tag");
if (IsPointer) {
  // Ensure that buffer has a pointer type.
  QualType BufferTy = getFunctionOrMethodParamType(D, ArgumentIdx);
  if (!BufferTy->isPointerType()) {
    S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only)
      << Attr.getName() << 0;
  }
}

D->addAttr(::new (S.Context)
           ArgumentWithTypeTagAttr(Attr.getRange(), S.Context, ArgumentKind,
                                   ArgumentIdx, TypeTagIdx, IsPointer,
                                   Attr.getAttributeSpellingListIndex()));
4610}

4612static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
                                       const AttributeList &Attr) {
if (!Attr.isArgIdent(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_type)
    << Attr.getName() << 1 << AANT_ArgumentIdentifier;
  return;
}

if (!checkAttributeNumArgs(S, Attr, 1))
  return;

if (!isa<VarDecl>(D)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedVariable;
  return;
}

IdentifierInfo *PointerKind = Attr.getArgAsIdent(0)->Ident;
TypeSourceInfo *MatchingCTypeLoc = nullptr;
S.GetTypeFromParser(Attr.getMatchingCType(), &MatchingCTypeLoc);
assert(MatchingCTypeLoc && "no type source info for attribute argument")(static_cast <bool> (MatchingCTypeLoc && "no type source info for attribute argument"
) ? void (0) : __assert_fail ("MatchingCTypeLoc && \"no type source info for attribute argument\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4632, __extension__ __PRETTY_FUNCTION__));

D->addAttr(::new (S.Context)
           TypeTagForDatatypeAttr(Attr.getRange(), S.Context, PointerKind,
                                  MatchingCTypeLoc,
                                  Attr.getLayoutCompatible(),
                                  Attr.getMustBeNull(),
                                  Attr.getAttributeSpellingListIndex()));
4640}

4642static void handleXRayLogArgsAttr(Sema &S, Decl *D,
                                const AttributeList &Attr) {
uint64_t ArgCount;

if (!checkFunctionOrMethodParameterIndex(S, D, Attr, 1, Attr.getArgAsExpr(0),
                                         ArgCount,
                                         true /* AllowImplicitThis*/))
  return;

// ArgCount isn't a parameter index [0;n), it's a count [1;n] - hence + 1.
D->addAttr(::new (S.Context)
               XRayLogArgsAttr(Attr.getRange(), S.Context, ++ArgCount,
                               Attr.getAttributeSpellingListIndex()));
4655}

4657//===----------------------------------------------------------------------===//
4658// Checker-specific attribute handlers.
4659//===----------------------------------------------------------------------===//

4661static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType type) {
return type->isDependentType() ||
       type->isObjCRetainableType();
4664}

4666static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) {
return type->isDependentType() || 
       type->isObjCObjectPointerType() || 
       S.Context.isObjCNSObjectType(type);
4670}

4672static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) {
return type->isDependentType() || 
       type->isPointerType() || 
       isValidSubjectOfNSAttribute(S, type);
4676}

4678static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
S.AddNSConsumedAttr(Attr.getRange(), D, Attr.getAttributeSpellingListIndex(),
                    Attr.getKind() == AttributeList::AT_NSConsumed,
                    /*template instantiation*/ false);
4682}

4684void Sema::AddNSConsumedAttr(SourceRange attrRange, Decl *D,
                           unsigned spellingIndex, bool isNSConsumed,
                           bool isTemplateInstantiation) {
ParmVarDecl *param = cast<ParmVarDecl>(D);
bool typeOK;

if (isNSConsumed) {
  typeOK = isValidSubjectOfNSAttribute(*this, param->getType());
} else {
  typeOK = isValidSubjectOfCFAttribute(*this, param->getType());
}

if (!typeOK) {
  // These attributes are normally just advisory, but in ARC, ns_consumed
  // is significant.  Allow non-dependent code to contain inappropriate
  // attributes even in ARC, but require template instantiations to be
  // set up correctly.
  Diag(D->getLocStart(),
       (isTemplateInstantiation && isNSConsumed &&
          getLangOpts().ObjCAutoRefCount
        ? diag::err_ns_attribute_wrong_parameter_type
        : diag::warn_ns_attribute_wrong_parameter_type))
    << attrRange
    << (isNSConsumed ? "ns_consumed" : "cf_consumed")
    << (isNSConsumed ? /*objc pointers*/ 0 : /*cf pointers*/ 1);
  return;
}

if (isNSConsumed)
  param->addAttr(::new (Context)
                 NSConsumedAttr(attrRange, Context, spellingIndex));
else
  param->addAttr(::new (Context)
                 CFConsumedAttr(attrRange, Context, spellingIndex));
4718}

4720bool Sema::checkNSReturnsRetainedReturnType(SourceLocation loc,
                                          QualType type) {
if (isValidSubjectOfNSReturnsRetainedAttribute(type))
  return false;

Diag(loc, diag::warn_ns_attribute_wrong_return_type)
  << "'ns_returns_retained'" << 0 << 0;
return true;
4728}

4730static void handleNSReturnsRetainedAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
QualType returnType;

if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
  returnType = MD->getReturnType();
else if (S.getLangOpts().ObjCAutoRefCount && hasDeclarator(D) &&
         (Attr.getKind() == AttributeList::AT_NSReturnsRetained))
  return; // ignore: was handled as a type attribute
else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D))
  returnType = PD->getType();
else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
  returnType = FD->getReturnType();
else if (auto *Param = dyn_cast<ParmVarDecl>(D)) {
  returnType = Param->getType()->getPointeeType();
  if (returnType.isNull()) {
    S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
        << Attr.getName() << /*pointer-to-CF*/2
        << Attr.getRange();
    return;
  }
} else if (Attr.isUsedAsTypeAttr()) {
  return;
} else {
  AttributeDeclKind ExpectedDeclKind;
  switch (Attr.getKind()) {
  default: llvm_unreachable("invalid ownership attribute")::llvm::llvm_unreachable_internal("invalid ownership attribute"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4756);
  case AttributeList::AT_NSReturnsRetained:
  case AttributeList::AT_NSReturnsAutoreleased:
  case AttributeList::AT_NSReturnsNotRetained:
    ExpectedDeclKind = ExpectedFunctionOrMethod;
    break;

  case AttributeList::AT_CFReturnsRetained:
  case AttributeList::AT_CFReturnsNotRetained:
    ExpectedDeclKind = ExpectedFunctionMethodOrParameter;
    break;
  }
  S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type)
      << Attr.getRange() << Attr.getName() << ExpectedDeclKind;
  return;
}

bool typeOK;
bool cf;
switch (Attr.getKind()) {
default: llvm_unreachable("invalid ownership attribute")::llvm::llvm_unreachable_internal("invalid ownership attribute"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4776);
case AttributeList::AT_NSReturnsRetained:
  typeOK = isValidSubjectOfNSReturnsRetainedAttribute(returnType);
  cf = false;
  break;
    
case AttributeList::AT_NSReturnsAutoreleased:
case AttributeList::AT_NSReturnsNotRetained:
  typeOK = isValidSubjectOfNSAttribute(S, returnType);
  cf = false;
  break;

case AttributeList::AT_CFReturnsRetained:
case AttributeList::AT_CFReturnsNotRetained:
  typeOK = isValidSubjectOfCFAttribute(S, returnType);
  cf = true;
  break;
}

if (!typeOK) {
  if (Attr.isUsedAsTypeAttr())
    return;

  if (isa<ParmVarDecl>(D)) {
    S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type)
        << Attr.getName() << /*pointer-to-CF*/2
        << Attr.getRange();
  } else {
    // Needs to be kept in sync with warn_ns_attribute_wrong_return_type.
    enum : unsigned {
      Function,
      Method,
      Property
    } SubjectKind = Function;
    if (isa<ObjCMethodDecl>(D))
      SubjectKind = Method;
    else if (isa<ObjCPropertyDecl>(D))
      SubjectKind = Property;
    S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
        << Attr.getName() << SubjectKind << cf
        << Attr.getRange();
  }
  return;
}

switch (Attr.getKind()) {
  default:
    llvm_unreachable("invalid ownership attribute")::llvm::llvm_unreachable_internal("invalid ownership attribute"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 4823);
  case AttributeList::AT_NSReturnsAutoreleased:
    D->addAttr(::new (S.Context) NSReturnsAutoreleasedAttr(
        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
    return;
  case AttributeList::AT_CFReturnsNotRetained:
    D->addAttr(::new (S.Context) CFReturnsNotRetainedAttr(
        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
    return;
  case AttributeList::AT_NSReturnsNotRetained:
    D->addAttr(::new (S.Context) NSReturnsNotRetainedAttr(
        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
    return;
  case AttributeList::AT_CFReturnsRetained:
    D->addAttr(::new (S.Context) CFReturnsRetainedAttr(
        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
    return;
  case AttributeList::AT_NSReturnsRetained:
    D->addAttr(::new (S.Context) NSReturnsRetainedAttr(
        Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
    return;
};
4845}

4847static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D,
                                            const AttributeList &Attrs) {
const int EP_ObjCMethod = 1;
const int EP_ObjCProperty = 2;

SourceLocation loc = Attrs.getLoc();
QualType resultType;
if (isa<ObjCMethodDecl>(D))
  resultType = cast<ObjCMethodDecl>(D)->getReturnType();
else
  resultType = cast<ObjCPropertyDecl>(D)->getType();

if (!resultType->isReferenceType() &&
    (!resultType->isPointerType() || resultType->isObjCRetainableType())) {
  S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type)
    << SourceRange(loc)
  << Attrs.getName()
  << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty)
  << /*non-retainable pointer*/ 2;

  // Drop the attribute.
  return;
}

D->addAttr(::new (S.Context) ObjCReturnsInnerPointerAttr(
    Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
4873}

4875static void handleObjCRequiresSuperAttr(Sema &S, Decl *D,
                                      const AttributeList &Attrs) {
ObjCMethodDecl *method = cast<ObjCMethodDecl>(D);

DeclContext *DC = method->getDeclContext();
if (const ObjCProtocolDecl *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) {
  S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
  << Attrs.getName() << 0;
  S.Diag(PDecl->getLocation(), diag::note_protocol_decl);
  return;
}
if (method->getMethodFamily() == OMF_dealloc) {
  S.Diag(D->getLocStart(), diag::warn_objc_requires_super_protocol)
  << Attrs.getName() << 1;
  return;
}

method->addAttr(::new (S.Context)
                ObjCRequiresSuperAttr(Attrs.getRange(), S.Context,
                                      Attrs.getAttributeSpellingListIndex()));
4895}

4897static void handleCFAuditedTransferAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
if (checkAttrMutualExclusion<CFUnknownTransferAttr>(S, D, Attr.getRange(),
                                                    Attr.getName()))
  return;

D->addAttr(::new (S.Context)
           CFAuditedTransferAttr(Attr.getRange(), S.Context,
                                 Attr.getAttributeSpellingListIndex()));
4906}

4908static void handleCFUnknownTransferAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
if (checkAttrMutualExclusion<CFAuditedTransferAttr>(S, D, Attr.getRange(),
                                                    Attr.getName()))
  return;

D->addAttr(::new (S.Context)
           CFUnknownTransferAttr(Attr.getRange(), S.Context,
           Attr.getAttributeSpellingListIndex()));
4917}

4919static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D,
                              const AttributeList &Attr) {
IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;

if (!Parm) {
  S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
  return;
}

// Typedefs only allow objc_bridge(id) and have some additional checking.
if (auto TD = dyn_cast<TypedefNameDecl>(D)) {
  if (!Parm->Ident->isStr("id")) {
    S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_id)
      << Attr.getName();
    return;
  }

  // Only allow 'cv void *'.
  QualType T = TD->getUnderlyingType();
  if (!T->isVoidPointerType()) {
    S.Diag(Attr.getLoc(), diag::err_objc_attr_typedef_not_void_pointer);
    return;
  }
}

D->addAttr(::new (S.Context)
           ObjCBridgeAttr(Attr.getRange(), S.Context, Parm->Ident,
                         Attr.getAttributeSpellingListIndex()));
4947}

4949static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
                                      const AttributeList &Attr) {
IdentifierLoc * Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : nullptr;

if (!Parm) {
  S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
  return;
}

D->addAttr(::new (S.Context)
           ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident,
                          Attr.getAttributeSpellingListIndex()));
4961}

4963static void handleObjCBridgeRelatedAttr(Sema &S, Scope *Sc, Decl *D,
                               const AttributeList &Attr) {
IdentifierInfo *RelatedClass =
  Attr.isArgIdent(0) ? Attr.getArgAsIdent(0)->Ident : nullptr;
if (!RelatedClass) {
  S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
  return;
}
IdentifierInfo *ClassMethod =
  Attr.getArgAsIdent(1) ? Attr.getArgAsIdent(1)->Ident : nullptr;
IdentifierInfo *InstanceMethod =
  Attr.getArgAsIdent(2) ? Attr.getArgAsIdent(2)->Ident : nullptr;
D->addAttr(::new (S.Context)
           ObjCBridgeRelatedAttr(Attr.getRange(), S.Context, RelatedClass,
                                 ClassMethod, InstanceMethod,
                                 Attr.getAttributeSpellingListIndex()));
4979}

4981static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
                                          const AttributeList &Attr) {
ObjCInterfaceDecl *IFace;
if (ObjCCategoryDecl *CatDecl =
        dyn_cast<ObjCCategoryDecl>(D->getDeclContext()))
  IFace = CatDecl->getClassInterface();
else
  IFace = cast<ObjCInterfaceDecl>(D->getDeclContext());

if (!IFace)
  return;

IFace->setHasDesignatedInitializers();
D->addAttr(::new (S.Context)
                ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context,
                                       Attr.getAttributeSpellingListIndex()));
4997}

4999static void handleObjCRuntimeName(Sema &S, Decl *D,
                                const AttributeList &Attr) {
StringRef MetaDataName;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, MetaDataName))
  return;
D->addAttr(::new (S.Context)
           ObjCRuntimeNameAttr(Attr.getRange(), S.Context,
                               MetaDataName,
                               Attr.getAttributeSpellingListIndex()));
5008}

5010// When a user wants to use objc_boxable with a union or struct
5011// but they don't have access to the declaration (legacy/third-party code)
5012// then they can 'enable' this feature with a typedef:
5013// typedef struct __attribute((objc_boxable)) legacy_struct legacy_struct;
5014static void handleObjCBoxable(Sema &S, Decl *D, const AttributeList &Attr) {
bool notify = false;

RecordDecl *RD = dyn_cast<RecordDecl>(D);
if (RD && RD->getDefinition()) {
  RD = RD->getDefinition();
  notify = true;
}

if (RD) {
  ObjCBoxableAttr *BoxableAttr = ::new (S.Context)
                        ObjCBoxableAttr(Attr.getRange(), S.Context,
                                        Attr.getAttributeSpellingListIndex());
  RD->addAttr(BoxableAttr);
  if (notify) {
    // we need to notify ASTReader/ASTWriter about
    // modification of existing declaration
    if (ASTMutationListener *L = S.getASTMutationListener())
      L->AddedAttributeToRecord(BoxableAttr, RD);
  }
}
5035}

5037static void handleObjCOwnershipAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
if (hasDeclarator(D)) return;

S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type)
  << Attr.getRange() << Attr.getName() << ExpectedVariable;
5043}

5045static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
                                        const AttributeList &Attr) {
ValueDecl *vd = cast<ValueDecl>(D);
QualType type = vd->getType();

if (!type->isDependentType() &&
    !type->isObjCLifetimeType()) {
  S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type)
    << type;
  return;
}

Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();

// If we have no lifetime yet, check the lifetime we're presumably
// going to infer.
if (lifetime == Qualifiers::OCL_None && !type->isDependentType())
  lifetime = type->getObjCARCImplicitLifetime();

switch (lifetime) {
case Qualifiers::OCL_None:
  assert(type->isDependentType() &&(static_cast <bool> (type->isDependentType() &&
 "didn't infer lifetime for non-dependent type?") ? void (0) :
 __assert_fail ("type->isDependentType() && \"didn't infer lifetime for non-dependent type?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 5067, __extension__ __PRETTY_FUNCTION__))
         "didn't infer lifetime for non-dependent type?")(static_cast <bool> (type->isDependentType() &&
 "didn't infer lifetime for non-dependent type?") ? void (0) :
 __assert_fail ("type->isDependentType() && \"didn't infer lifetime for non-dependent type?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 5067, __extension__ __PRETTY_FUNCTION__));
  break;

case Qualifiers::OCL_Weak:   // meaningful
case Qualifiers::OCL_Strong: // meaningful
  break;

case Qualifiers::OCL_ExplicitNone:
case Qualifiers::OCL_Autoreleasing:
  S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
    << (lifetime == Qualifiers::OCL_Autoreleasing);
  break;
}

D->addAttr(::new (S.Context)
           ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context,
                                   Attr.getAttributeSpellingListIndex()));
5084}

5086//===----------------------------------------------------------------------===//
5087// Microsoft specific attribute handlers.
5088//===----------------------------------------------------------------------===//

5090UuidAttr *Sema::mergeUuidAttr(Decl *D, SourceRange Range,
                            unsigned AttrSpellingListIndex, StringRef Uuid) {
if (const auto *UA = D->getAttr<UuidAttr>()) {
  if (UA->getGuid().equals_lower(Uuid))
    return nullptr;
  Diag(UA->getLocation(), diag::err_mismatched_uuid);
  Diag(Range.getBegin(), diag::note_previous_uuid);
  D->dropAttr<UuidAttr>();
}

return ::new (Context) UuidAttr(Range, Context, Uuid, AttrSpellingListIndex);
5101}

5103static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!S.LangOpts.CPlusPlus) {
  S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
    << Attr.getName() << AttributeLangSupport::C;
  return;
}

StringRef StrRef;
SourceLocation LiteralLoc;
if (!S.checkStringLiteralArgumentAttr(Attr, 0, StrRef, &LiteralLoc))
  return;

// GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
// "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", normalize to the former.
if (StrRef.size() == 38 && StrRef.front() == '{' && StrRef.back() == '}')
  StrRef = StrRef.drop_front().drop_back();

// Validate GUID length.
if (StrRef.size() != 36) {
  S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
  return;
}

for (unsigned i = 0; i < 36; ++i) {
  if (i == 8 || i == 13 || i == 18 || i == 23) {
    if (StrRef[i] != '-') {
      S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
      return;
    }
  } else if (!isHexDigit(StrRef[i])) {
    S.Diag(LiteralLoc, diag::err_attribute_uuid_malformed_guid);
    return;
  }
}

// FIXME: It'd be nice to also emit a fixit removing uuid(...) (and, if it's
// the only thing in the [] list, the [] too), and add an insertion of
// __declspec(uuid(...)).  But sadly, neither the SourceLocs of the commas
// separating attributes nor of the [ and the ] are in the AST.
// Cf "SourceLocations of attribute list delimiters - [[ ... , ... ]] etc"
// on cfe-dev.
if (Attr.isMicrosoftAttribute()) // Check for [uuid(...)] spelling.
  S.Diag(Attr.getLoc(), diag::warn_atl_uuid_deprecated);

UuidAttr *UA = S.mergeUuidAttr(D, Attr.getRange(),
                               Attr.getAttributeSpellingListIndex(), StrRef);
if (UA)
  D->addAttr(UA);
5151}

5153static void handleMSInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!S.LangOpts.CPlusPlus) {
  S.Diag(Attr.getLoc(), diag::err_attribute_not_supported_in_lang)
    << Attr.getName() << AttributeLangSupport::C;
  return;
}
MSInheritanceAttr *IA = S.mergeMSInheritanceAttr(
    D, Attr.getRange(), /*BestCase=*/true,
    Attr.getAttributeSpellingListIndex(),
    (MSInheritanceAttr::Spelling)Attr.getSemanticSpelling());
if (IA) {
  D->addAttr(IA);
  S.Consumer.AssignInheritanceModel(cast<CXXRecordDecl>(D));
}
5167}

5169static void handleDeclspecThreadAttr(Sema &S, Decl *D,
                                   const AttributeList &Attr) {
VarDecl *VD = cast<VarDecl>(D);
if (!S.Context.getTargetInfo().isTLSSupported()) {
  S.Diag(Attr.getLoc(), diag::err_thread_unsupported);
  return;
}
if (VD->getTSCSpec() != TSCS_unspecified) {
  S.Diag(Attr.getLoc(), diag::err_declspec_thread_on_thread_variable);
  return;
}
if (VD->hasLocalStorage()) {
  S.Diag(Attr.getLoc(), diag::err_thread_non_global) << "__declspec(thread)";
  return;
}
VD->addAttr(::new (S.Context) ThreadAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
5186}

5188static void handleAbiTagAttr(Sema &S, Decl *D, const AttributeList &Attr) {
SmallVector<StringRef, 4> Tags;
for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
  StringRef Tag;
  if (!S.checkStringLiteralArgumentAttr(Attr, I, Tag))
    return;
  Tags.push_back(Tag);
}

if (const auto *NS = dyn_cast<NamespaceDecl>(D)) {
  if (!NS->isInline()) {
    S.Diag(Attr.getLoc(), diag::warn_attr_abi_tag_namespace) << 0;
    return;
  }
  if (NS->isAnonymousNamespace()) {
    S.Diag(Attr.getLoc(), diag::warn_attr_abi_tag_namespace) << 1;
    return;
  }
  if (Attr.getNumArgs() == 0)
    Tags.push_back(NS->getName());
} else if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

// Store tags sorted and without duplicates.
std::sort(Tags.begin(), Tags.end());
Tags.erase(std::unique(Tags.begin(), Tags.end()), Tags.end());

D->addAttr(::new (S.Context)
           AbiTagAttr(Attr.getRange(), S.Context, Tags.data(), Tags.size(),
                      Attr.getAttributeSpellingListIndex()));
5218}

5220static void handleARMInterruptAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
// Check the attribute arguments.
if (Attr.getNumArgs() > 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
    << Attr.getName() << 1;
  return;
}

StringRef Str;
SourceLocation ArgLoc;

if (Attr.getNumArgs() == 0)
  Str = "";
else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
  return;

ARMInterruptAttr::InterruptType Kind;
if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
    << Attr.getName() << Str << ArgLoc;
  return;
}

unsigned Index = Attr.getAttributeSpellingListIndex();
D->addAttr(::new (S.Context)
           ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index));
5247}

5249static void handleMSP430InterruptAttr(Sema &S, Decl *D,
                                    const AttributeList &Attr) {
if (!checkAttributeNumArgs(S, Attr, 1))
  return;

if (!Attr.isArgExpr(0)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName()
    << AANT_ArgumentIntegerConstant;
  return;    
}

// FIXME: Check for decl - it should be void ()(void).

Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
llvm::APSInt NumParams(32);
if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
    << Attr.getName() << AANT_ArgumentIntegerConstant
    << NumParamsExpr->getSourceRange();
  return;
}

unsigned Num = NumParams.getLimitedValue(255);
if ((Num & 1) || Num > 30) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
    << Attr.getName() << (int)NumParams.getSExtValue()
    << NumParamsExpr->getSourceRange();
  return;
}

D->addAttr(::new (S.Context)
            MSP430InterruptAttr(Attr.getLoc(), S.Context, Num,
                                Attr.getAttributeSpellingListIndex()));
D->addAttr(UsedAttr::CreateImplicit(S.Context));
5283}

5285static void handleMipsInterruptAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
// Only one optional argument permitted.
if (Attr.getNumArgs() > 1) {
  S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
      << Attr.getName() << 1;
  return;
}

StringRef Str;
SourceLocation ArgLoc;

if (Attr.getNumArgs() == 0)
  Str = "";
else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
  return;

// Semantic checks for a function with the 'interrupt' attribute for MIPS:
// a) Must be a function.
// b) Must have no parameters.
// c) Must have the 'void' return type.
// d) Cannot have the 'mips16' attribute, as that instruction set
//    lacks the 'eret' instruction.
// e) The attribute itself must either have no argument or one of the
//    valid interrupt types, see [MipsInterruptDocs].

if (!isFunctionOrMethod(D)) {
  S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
      << "'interrupt'" << ExpectedFunctionOrMethod;
  return;
}

if (hasFunctionProto(D) && getFunctionOrMethodNumParams(D) != 0) {
  S.Diag(D->getLocation(), diag::warn_mips_interrupt_attribute)
      << 0;
  return;
}

if (!getFunctionOrMethodResultType(D)->isVoidType()) {
  S.Diag(D->getLocation(), diag::warn_mips_interrupt_attribute)
      << 1;
  return;
}

if (checkAttrMutualExclusion<Mips16Attr>(S, D, Attr.getRange(),
                                         Attr.getName()))
  return;

MipsInterruptAttr::InterruptType Kind;
if (!MipsInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
      << Attr.getName() << "'" + std::string(Str) + "'";
  return;
}

D->addAttr(::new (S.Context) MipsInterruptAttr(
    Attr.getLoc(), S.Context, Kind, Attr.getAttributeSpellingListIndex()));
5342}

5344static void handleAnyX86InterruptAttr(Sema &S, Decl *D,
                                    const AttributeList &Attr) {
// Semantic checks for a function with the 'interrupt' attribute.
// a) Must be a function.
// b) Must have the 'void' return type.
// c) Must take 1 or 2 arguments.
// d) The 1st argument must be a pointer.
// e) The 2nd argument (if any) must be an unsigned integer.
if (!isFunctionOrMethod(D) || !hasFunctionProto(D) || isInstanceMethod(D) ||
    CXXMethodDecl::isStaticOverloadedOperator(
        cast<NamedDecl>(D)->getDeclName().getCXXOverloadedOperator())) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
      << Attr.getName() << ExpectedFunctionWithProtoType;
  return;
}
// Interrupt handler must have void return type.
if (!getFunctionOrMethodResultType(D)->isVoidType()) {
  S.Diag(getFunctionOrMethodResultSourceRange(D).getBegin(),
         diag::err_anyx86_interrupt_attribute)
      << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
              ? 0
              : 1)
      << 0;
  return;
}
// Interrupt handler must have 1 or 2 parameters.
unsigned NumParams = getFunctionOrMethodNumParams(D);
if (NumParams < 1 || NumParams > 2) {
  S.Diag(D->getLocStart(), diag::err_anyx86_interrupt_attribute)
      << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
              ? 0
              : 1)
      << 1;
  return;
}
// The first argument must be a pointer.
if (!getFunctionOrMethodParamType(D, 0)->isPointerType()) {
  S.Diag(getFunctionOrMethodParamRange(D, 0).getBegin(),
         diag::err_anyx86_interrupt_attribute)
      << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
              ? 0
              : 1)
      << 2;
  return;
}
// The second argument, if present, must be an unsigned integer.
unsigned TypeSize =
    S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86_64
        ? 64
        : 32;
if (NumParams == 2 &&
    (!getFunctionOrMethodParamType(D, 1)->isUnsignedIntegerType() ||
     S.Context.getTypeSize(getFunctionOrMethodParamType(D, 1)) != TypeSize)) {
  S.Diag(getFunctionOrMethodParamRange(D, 1).getBegin(),
         diag::err_anyx86_interrupt_attribute)
      << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
              ? 0
              : 1)
      << 3 << S.Context.getIntTypeForBitwidth(TypeSize, /*Signed=*/false);
  return;
}
D->addAttr(::new (S.Context) AnyX86InterruptAttr(
    Attr.getLoc(), S.Context, Attr.getAttributeSpellingListIndex()));
D->addAttr(UsedAttr::CreateImplicit(S.Context));
5408}

5410static void handleAVRInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!isFunctionOrMethod(D)) {
  S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
      << "'interrupt'" << ExpectedFunction;
  return;
}

if (!checkAttributeNumArgs(S, Attr, 0))
  return;

handleSimpleAttribute<AVRInterruptAttr>(S, D, Attr);
5421}

5423static void handleAVRSignalAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!isFunctionOrMethod(D)) {
  S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
      << "'signal'" << ExpectedFunction;
  return;
}

if (!checkAttributeNumArgs(S, Attr, 0))
  return;

handleSimpleAttribute<AVRSignalAttr>(S, D, Attr);
5434}

5436static void handleInterruptAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Dispatch the interrupt attribute based on the current target.
switch (S.Context.getTargetInfo().getTriple().getArch()) {
case llvm::Triple::msp430:
  handleMSP430InterruptAttr(S, D, Attr);
  break;
case llvm::Triple::mipsel:
case llvm::Triple::mips:
  handleMipsInterruptAttr(S, D, Attr);
  break;
case llvm::Triple::x86:
case llvm::Triple::x86_64:
  handleAnyX86InterruptAttr(S, D, Attr);
  break;
case llvm::Triple::avr:
  handleAVRInterruptAttr(S, D, Attr);
  break;
default:
  handleARMInterruptAttr(S, D, Attr);
  break;
}
5457}

5459static void handleAMDGPUFlatWorkGroupSizeAttr(Sema &S, Decl *D,
                                            const AttributeList &Attr) {
uint32_t Min = 0;
Expr *MinExpr = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(S, Attr, MinExpr, Min))
  return;

uint32_t Max = 0;
Expr *MaxExpr = Attr.getArgAsExpr(1);
if (!checkUInt32Argument(S, Attr, MaxExpr, Max))
  return;

if (Min == 0 && Max != 0) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
    << Attr.getName() << 0;
  return;
}
if (Min > Max) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
    << Attr.getName() << 1;
  return;
}

D->addAttr(::new (S.Context)
           AMDGPUFlatWorkGroupSizeAttr(Attr.getLoc(), S.Context, Min, Max,
                                       Attr.getAttributeSpellingListIndex()));
5485}

5487static void handleAMDGPUWavesPerEUAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
uint32_t Min = 0;
Expr *MinExpr = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(S, Attr, MinExpr, Min))
  return;

uint32_t Max = 0;
if (Attr.getNumArgs() == 2) {
  Expr *MaxExpr = Attr.getArgAsExpr(1);
  if (!checkUInt32Argument(S, Attr, MaxExpr, Max))
    return;
}

if (Min == 0 && Max != 0) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
    << Attr.getName() << 0;
  return;
}
if (Max != 0 && Min > Max) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_invalid)
    << Attr.getName() << 1;
  return;
}

D->addAttr(::new (S.Context)
           AMDGPUWavesPerEUAttr(Attr.getLoc(), S.Context, Min, Max,
                                Attr.getAttributeSpellingListIndex()));
5515}

5517static void handleAMDGPUNumSGPRAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
uint32_t NumSGPR = 0;
Expr *NumSGPRExpr = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(S, Attr, NumSGPRExpr, NumSGPR))
  return;

D->addAttr(::new (S.Context)
           AMDGPUNumSGPRAttr(Attr.getLoc(), S.Context, NumSGPR,
                             Attr.getAttributeSpellingListIndex()));
5527}

5529static void handleAMDGPUNumVGPRAttr(Sema &S, Decl *D,
                                  const AttributeList &Attr) {
uint32_t NumVGPR = 0;
Expr *NumVGPRExpr = Attr.getArgAsExpr(0);
if (!checkUInt32Argument(S, Attr, NumVGPRExpr, NumVGPR))
  return;

D->addAttr(::new (S.Context)
           AMDGPUNumVGPRAttr(Attr.getLoc(), S.Context, NumVGPR,
                             Attr.getAttributeSpellingListIndex()));
5539}

5541static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D,
                                            const AttributeList& Attr) {
// If we try to apply it to a function pointer, don't warn, but don't
// do anything, either. It doesn't matter anyway, because there's nothing
// special about calling a force_align_arg_pointer function.
ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (VD && VD->getType()->isFunctionPointerType())
  return;
// Also don't warn on function pointer typedefs.
TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D);
if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
  TD->getUnderlyingType()->isFunctionType()))
  return;
// Attribute can only be applied to function types.
if (!isa<FunctionDecl>(D)) {
  S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
    << Attr.getName() << ExpectedFunction;
  return;
}

D->addAttr(::new (S.Context)
            X86ForceAlignArgPointerAttr(Attr.getRange(), S.Context,
                                      Attr.getAttributeSpellingListIndex()));
5564}

5566static void handleLayoutVersion(Sema &S, Decl *D, const AttributeList &Attr) {
uint32_t Version;
Expr *VersionExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
if (!checkUInt32Argument(S, Attr, Attr.getArgAsExpr(0), Version))
  return;

// TODO: Investigate what happens with the next major version of MSVC.
if (Version != LangOptions::MSVC2015) {
  S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
      << Attr.getName() << Version << VersionExpr->getSourceRange();
  return;
}

D->addAttr(::new (S.Context)
               LayoutVersionAttr(Attr.getRange(), S.Context, Version,
                                 Attr.getAttributeSpellingListIndex()));
5582}

5584DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range,
                                      unsigned AttrSpellingListIndex) {
if (D->hasAttr<DLLExportAttr>()) {
  Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'";
  return nullptr;
}

if (D->hasAttr<DLLImportAttr>())
  return nullptr;

return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
5595}

5597DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range,
                                      unsigned AttrSpellingListIndex) {
if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) {
  Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import;
  D->dropAttr<DLLImportAttr>();
}

if (D->hasAttr<DLLExportAttr>())
  return nullptr;

return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex);
5608}

5610static void handleDLLAttr(Sema &S, Decl *D, const AttributeList &A) {
if (isa<ClassTemplatePartialSpecializationDecl>(D) &&
    S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
  S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored)
      << A.getName();
  return;
}

if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
  if (FD->isInlined() && A.getKind() == AttributeList::AT_DLLImport &&
      !S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
    // MinGW doesn't allow dllimport on inline functions.
    S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored_on_inline)
        << A.getName();
    return;
  }
}

if (auto *MD = dyn_cast<CXXMethodDecl>(D)) {
  if (S.Context.getTargetInfo().getCXXABI().isMicrosoft() &&
      MD->getParent()->isLambda()) {
    S.Diag(A.getRange().getBegin(), diag::err_attribute_dll_lambda) << A.getName();
    return;
  }
}

unsigned Index = A.getAttributeSpellingListIndex();
Attr *NewAttr = A.getKind() == AttributeList::AT_DLLExport
                    ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index)
                    : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index);
if (NewAttr)
  D->addAttr(NewAttr);
5642}

5644MSInheritanceAttr *
5645Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
                           unsigned AttrSpellingListIndex,
                           MSInheritanceAttr::Spelling SemanticSpelling) {
if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) {
  if (IA->getSemanticSpelling() == SemanticSpelling)
    return nullptr;
  Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance)
      << 1 /*previous declaration*/;
  Diag(Range.getBegin(), diag::note_previous_ms_inheritance);
  D->dropAttr<MSInheritanceAttr>();
}

CXXRecordDecl *RD = cast<CXXRecordDecl>(D);
if (RD->hasDefinition()) {
  if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase,
                                         SemanticSpelling)) {
    return nullptr;
  }
} else {
  if (isa<ClassTemplatePartialSpecializationDecl>(RD)) {
    Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
        << 1 /*partial specialization*/;
    return nullptr;
  }
  if (RD->getDescribedClassTemplate()) {
    Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
        << 0 /*primary template*/;
    return nullptr;
  }
}

return ::new (Context)
    MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex);
5678}

5680static void handleCapabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// The capability attributes take a single string parameter for the name of
// the capability they represent. The lockable attribute does not take any
// parameters. However, semantically, both attributes represent the same
// concept, and so they use the same semantic attribute. Eventually, the
// lockable attribute will be removed.
//
// For backward compatibility, any capability which has no specified string
// literal will be considered a "mutex."
StringRef N("mutex");
SourceLocation LiteralLoc;
if (Attr.getKind() == AttributeList::AT_Capability &&
    !S.checkStringLiteralArgumentAttr(Attr, 0, N, &LiteralLoc))
  return;

// Currently, there are only two names allowed for a capability: role and
// mutex (case insensitive). Diagnose other capability names.
if (!N.equals_lower("mutex") && !N.equals_lower("role"))
  S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N;

D->addAttr(::new (S.Context) CapabilityAttr(Attr.getRange(), S.Context, N,
                                      Attr.getAttributeSpellingListIndex()));
5702}

5704static void handleAssertCapabilityAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
  return;

D->addAttr(::new (S.Context) AssertCapabilityAttr(Attr.getRange(), S.Context,
                                                  Args.data(), Args.size(),
                                      Attr.getAttributeSpellingListIndex()));
5713}

5715static void handleAcquireCapabilityAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
SmallVector<Expr*, 1> Args;
if (!checkLockFunAttrCommon(S, D, Attr, Args))
  return;

D->addAttr(::new (S.Context) AcquireCapabilityAttr(Attr.getRange(),
                                                   S.Context,
                                                   Args.data(), Args.size(),
                                      Attr.getAttributeSpellingListIndex()));
5725}

5727static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D,
                                         const AttributeList &Attr) {
SmallVector<Expr*, 2> Args;
if (!checkTryLockFunAttrCommon(S, D, Attr, Args))
  return;

D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(Attr.getRange(),
                                                      S.Context,
                                                      Attr.getArgAsExpr(0),
                                                      Args.data(),
                                                      Args.size(),
                                      Attr.getAttributeSpellingListIndex()));
5739}

5741static void handleReleaseCapabilityAttr(Sema &S, Decl *D,
                                      const AttributeList &Attr) {
// Check that all arguments are lockable objects.
SmallVector<Expr *, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args, 0, true);

D->addAttr(::new (S.Context) ReleaseCapabilityAttr(
    Attr.getRange(), S.Context, Args.data(), Args.size(),
    Attr.getAttributeSpellingListIndex()));
5750}

5752static void handleRequiresCapabilityAttr(Sema &S, Decl *D,
                                       const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

// check that all arguments are lockable objects
SmallVector<Expr*, 1> Args;
checkAttrArgsAreCapabilityObjs(S, D, Attr, Args);
if (Args.empty())
  return;

RequiresCapabilityAttr *RCA = ::new (S.Context)
  RequiresCapabilityAttr(Attr.getRange(), S.Context, Args.data(),
                         Args.size(), Attr.getAttributeSpellingListIndex());

D->addAttr(RCA);
5768}

5770static void handleDeprecatedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (auto *NSD = dyn_cast<NamespaceDecl>(D)) {
  if (NSD->isAnonymousNamespace()) {
    S.Diag(Attr.getLoc(), diag::warn_deprecated_anonymous_namespace);
    // Do not want to attach the attribute to the namespace because that will
    // cause confusing diagnostic reports for uses of declarations within the
    // namespace.
    return;
  }
}

// Handle the cases where the attribute has a text message.
StringRef Str, Replacement;
if (Attr.isArgExpr(0) && Attr.getArgAsExpr(0) &&
    !S.checkStringLiteralArgumentAttr(Attr, 0, Str))
  return;

// Only support a single optional message for Declspec and CXX11.
if (Attr.isDeclspecAttribute() || Attr.isCXX11Attribute())
  checkAttributeAtMostNumArgs(S, Attr, 1);
else if (Attr.isArgExpr(1) && Attr.getArgAsExpr(1) &&
         !S.checkStringLiteralArgumentAttr(Attr, 1, Replacement))
  return;

if (!S.getLangOpts().CPlusPlus14)
  if (Attr.isCXX11Attribute() &&
      !(Attr.hasScope() && Attr.getScopeName()->isStr("gnu")))
    S.Diag(Attr.getLoc(), diag::ext_cxx14_attr) << Attr.getName();

D->addAttr(::new (S.Context)
               DeprecatedAttr(Attr.getRange(), S.Context, Str, Replacement,
                              Attr.getAttributeSpellingListIndex()));
5802}

5804static bool isGlobalVar(const Decl *D) {
if (const auto *S = dyn_cast<VarDecl>(D))
  return S->hasGlobalStorage();
return false;
5808}

5810static void handleNoSanitizeAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (!checkAttributeAtLeastNumArgs(S, Attr, 1))
  return;

std::vector<StringRef> Sanitizers;

for (unsigned I = 0, E = Attr.getNumArgs(); I != E; ++I) {
  StringRef SanitizerName;
  SourceLocation LiteralLoc;

  if (!S.checkStringLiteralArgumentAttr(Attr, I, SanitizerName, &LiteralLoc))
    return;

  if (parseSanitizerValue(SanitizerName, /*AllowGroups=*/true) == 0)
    S.Diag(LiteralLoc, diag::warn_unknown_sanitizer_ignored) << SanitizerName;
  else if (isGlobalVar(D) && SanitizerName != "address")
    S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
        << Attr.getName() << ExpectedFunctionOrMethod;
  Sanitizers.push_back(SanitizerName);
}

D->addAttr(::new (S.Context) NoSanitizeAttr(
    Attr.getRange(), S.Context, Sanitizers.data(), Sanitizers.size(),
    Attr.getAttributeSpellingListIndex()));
5834}

5836static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
                                       const AttributeList &Attr) {
StringRef AttrName = Attr.getName()->getName();
normalizeName(AttrName);
StringRef SanitizerName = llvm::StringSwitch<StringRef>(AttrName)
                              .Case("no_address_safety_analysis", "address")
                              .Case("no_sanitize_address", "address")
                              .Case("no_sanitize_thread", "thread")
                              .Case("no_sanitize_memory", "memory");
if (isGlobalVar(D) && SanitizerName != "address")
  S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
      << Attr.getName() << ExpectedFunction;
D->addAttr(::new (S.Context)
               NoSanitizeAttr(Attr.getRange(), S.Context, &SanitizerName, 1,
                              Attr.getAttributeSpellingListIndex()));
5851}

5853static void handleInternalLinkageAttr(Sema &S, Decl *D,
                                    const AttributeList &Attr) {
if (InternalLinkageAttr *Internal =
        S.mergeInternalLinkageAttr(D, Attr.getRange(), Attr.getName(),
                                   Attr.getAttributeSpellingListIndex()))
  D->addAttr(Internal);
5859}

5861static void handleOpenCLNoSVMAttr(Sema &S, Decl *D, const AttributeList &Attr) {
if (S.LangOpts.OpenCLVersion != 200)
  S.Diag(Attr.getLoc(), diag::err_attribute_requires_opencl_version)
      << Attr.getName() << "2.0" << 0;
else
  S.Diag(Attr.getLoc(), diag::warn_opencl_attr_deprecated_ignored)
      << Attr.getName() << "2.0";
5868}

5870/// Handles semantic checking for features that are common to all attributes,
5871/// such as checking whether a parameter was properly specified, or the correct
5872/// number of arguments were passed, etc.
5873static bool handleCommonAttributeFeatures(Sema &S, Scope *scope, Decl *D,
                                        const AttributeList &Attr) {
// Several attributes carry different semantics than the parsing requires, so
// those are opted out of the common argument checks.
//
// We also bail on unknown and ignored attributes because those are handled
// as part of the target-specific handling logic.
if (Attr.getKind() == AttributeList::UnknownAttribute)
  return false;
// Check whether the attribute requires specific language extensions to be
// enabled.
if (!Attr.diagnoseLangOpts(S))
  return true;
// Check whether the attribute appertains to the given subject.
if (!Attr.diagnoseAppertainsTo(S, D))
  return true;
if (Attr.hasCustomParsing())
  return false;

if (Attr.getMinArgs() == Attr.getMaxArgs()) {
  // If there are no optional arguments, then checking for the argument count
  // is trivial.
  if (!checkAttributeNumArgs(S, Attr, Attr.getMinArgs()))
    return true;
} else {
  // There are optional arguments, so checking is slightly more involved.
  if (Attr.getMinArgs() &&
      !checkAttributeAtLeastNumArgs(S, Attr, Attr.getMinArgs()))
    return true;
  else if (!Attr.hasVariadicArg() && Attr.getMaxArgs() &&
           !checkAttributeAtMostNumArgs(S, Attr, Attr.getMaxArgs()))
    return true;
}

return false;
5908}

5910static void handleOpenCLAccessAttr(Sema &S, Decl *D,
                                 const AttributeList &Attr) {
if (D->isInvalidDecl())
  return;

// Check if there is only one access qualifier.
if (D->hasAttr<OpenCLAccessAttr>()) {
  S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers)
      << D->getSourceRange();
  D->setInvalidDecl(true);
  return;
}

// OpenCL v2.0 s6.6 - read_write can be used for image types to specify that an
// image object can be read and written.
// OpenCL v2.0 s6.13.6 - A kernel cannot read from and write to the same pipe
// object. Using the read_write (or __read_write) qualifier with the pipe
// qualifier is a compilation error.
if (const ParmVarDecl *PDecl = dyn_cast<ParmVarDecl>(D)) {
  const Type *DeclTy = PDecl->getType().getCanonicalType().getTypePtr();
  if (Attr.getName()->getName().find("read_write") != StringRef::npos) {
    if (S.getLangOpts().OpenCLVersion < 200 || DeclTy->isPipeType()) {
      S.Diag(Attr.getLoc(), diag::err_opencl_invalid_read_write)
          << Attr.getName() << PDecl->getType() << DeclTy->isImageType();
      D->setInvalidDecl(true);
      return;
    }
  }
}

D->addAttr(::new (S.Context) OpenCLAccessAttr(
    Attr.getRange(), S.Context, Attr.getAttributeSpellingListIndex()));
5942}

5944//===----------------------------------------------------------------------===//
5945// Top Level Sema Entry Points
5946//===----------------------------------------------------------------------===//

5948/// ProcessDeclAttribute - Apply the specific attribute to the specified decl if
5949/// the attribute applies to decls.  If the attribute is a type attribute, just
5950/// silently ignore it if a GNU attribute.
5951static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
                               const AttributeList &Attr,
                               bool IncludeCXX11Attributes) {
if (Attr.isInvalid() || Attr.getKind() == AttributeList::IgnoredAttribute)
  return;

// Ignore C++11 attributes on declarator chunks: they appertain to the type
// instead.
if (Attr.isCXX11Attribute() && !IncludeCXX11Attributes)
  return;

// Unknown attributes are automatically warned on. Target-specific attributes
// which do not apply to the current target architecture are treated as
// though they were unknown attributes.
if (Attr.getKind() == AttributeList::UnknownAttribute ||
    !Attr.existsInTarget(S.Context.getTargetInfo())) {
  S.Diag(Attr.getLoc(), Attr.isDeclspecAttribute()
                            ? diag::warn_unhandled_ms_attribute_ignored
                            : diag::warn_unknown_attribute_ignored)
      << Attr.getName();
  return;
}

if (handleCommonAttributeFeatures(S, scope, D, Attr))
  return;

switch (Attr.getKind()) {
default:
  if (!Attr.isStmtAttr()) {
    // Type attributes are handled elsewhere; silently move on.
    assert(Attr.isTypeAttr() && "Non-type attribute not handled")(static_cast <bool> (Attr.isTypeAttr() && "Non-type attribute not handled"
) ? void (0) : __assert_fail ("Attr.isTypeAttr() && \"Non-type attribute not handled\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 5981, __extension__ __PRETTY_FUNCTION__));
    break;
  }
  S.Diag(Attr.getLoc(), diag::err_stmt_attribute_invalid_on_decl)
      << Attr.getName() << D->getLocation();
  break;
case AttributeList::AT_Interrupt:
  handleInterruptAttr(S, D, Attr);
  break;
case AttributeList::AT_X86ForceAlignArgPointer:
  handleX86ForceAlignArgPointerAttr(S, D, Attr);
  break;
case AttributeList::AT_DLLExport:
case AttributeList::AT_DLLImport:
  handleDLLAttr(S, D, Attr);
  break;
case AttributeList::AT_Mips16:
  handleSimpleAttributeWithExclusions<Mips16Attr, MicroMipsAttr,
                                      MipsInterruptAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoMips16:
  handleSimpleAttribute<NoMips16Attr>(S, D, Attr);
  break;
case AttributeList::AT_MicroMips:
  handleSimpleAttributeWithExclusions<MicroMipsAttr, Mips16Attr>(S, D, Attr);
  break;
case AttributeList::AT_NoMicroMips:
  handleSimpleAttribute<NoMicroMipsAttr>(S, D, Attr);
  break;
case AttributeList::AT_MipsLongCall:
  handleSimpleAttributeWithExclusions<MipsLongCallAttr, MipsShortCallAttr>(
      S, D, Attr);
  break;
case AttributeList::AT_MipsShortCall:
  handleSimpleAttributeWithExclusions<MipsShortCallAttr, MipsLongCallAttr>(
      S, D, Attr);
  break;
case AttributeList::AT_AMDGPUFlatWorkGroupSize:
  handleAMDGPUFlatWorkGroupSizeAttr(S, D, Attr);
  break;
case AttributeList::AT_AMDGPUWavesPerEU:
  handleAMDGPUWavesPerEUAttr(S, D, Attr);
  break;
case AttributeList::AT_AMDGPUNumSGPR:
  handleAMDGPUNumSGPRAttr(S, D, Attr);
  break;
case AttributeList::AT_AMDGPUNumVGPR:
  handleAMDGPUNumVGPRAttr(S, D, Attr);
  break;
case AttributeList::AT_AVRSignal:
  handleAVRSignalAttr(S, D, Attr);
  break;
case AttributeList::AT_IBAction:
  handleSimpleAttribute<IBActionAttr>(S, D, Attr);
  break;
case AttributeList::AT_IBOutlet:
  handleIBOutlet(S, D, Attr);
  break;
case AttributeList::AT_IBOutletCollection:
  handleIBOutletCollection(S, D, Attr);
  break;
case AttributeList::AT_IFunc:
  handleIFuncAttr(S, D, Attr);
  break;
case AttributeList::AT_Alias:
  handleAliasAttr(S, D, Attr);
  break;
case AttributeList::AT_Aligned:
  handleAlignedAttr(S, D, Attr);
  break;
case AttributeList::AT_AlignValue:
  handleAlignValueAttr(S, D, Attr);
  break;
case AttributeList::AT_AllocSize:
  handleAllocSizeAttr(S, D, Attr);
  break;
case AttributeList::AT_AlwaysInline:
  handleAlwaysInlineAttr(S, D, Attr);
  break;
case AttributeList::AT_Artificial:
  handleSimpleAttribute<ArtificialAttr>(S, D, Attr);
  break;
case AttributeList::AT_AnalyzerNoReturn:
  handleAnalyzerNoReturnAttr(S, D, Attr);
  break;
case AttributeList::AT_TLSModel:
  handleTLSModelAttr(S, D, Attr);
  break;
case AttributeList::AT_Annotate:
  handleAnnotateAttr(S, D, Attr);
  break;
case AttributeList::AT_Availability:
  handleAvailabilityAttr(S, D, Attr);
  break;
case AttributeList::AT_CarriesDependency:
  handleDependencyAttr(S, scope, D, Attr);
  break;
case AttributeList::AT_Common:
  handleCommonAttr(S, D, Attr);
  break;
case AttributeList::AT_CUDAConstant:
  handleConstantAttr(S, D, Attr);
  break;
case AttributeList::AT_PassObjectSize:
  handlePassObjectSizeAttr(S, D, Attr);
  break;
case AttributeList::AT_Constructor:
  handleConstructorAttr(S, D, Attr);
  break;
case AttributeList::AT_CXX11NoReturn:
  handleSimpleAttribute<CXX11NoReturnAttr>(S, D, Attr);
  break;
case AttributeList::AT_Deprecated:
  handleDeprecatedAttr(S, D, Attr);
  break;
case AttributeList::AT_Destructor:
  handleDestructorAttr(S, D, Attr);
  break;
case AttributeList::AT_EnableIf:
  handleEnableIfAttr(S, D, Attr);
  break;
case AttributeList::AT_DiagnoseIf:
  handleDiagnoseIfAttr(S, D, Attr);
  break;
case AttributeList::AT_ExtVectorType:
  handleExtVectorTypeAttr(S, scope, D, Attr);
  break;
case AttributeList::AT_ExternalSourceSymbol:
  handleExternalSourceSymbolAttr(S, D, Attr);
  break;
case AttributeList::AT_MinSize:
  handleMinSizeAttr(S, D, Attr);
  break;
case AttributeList::AT_OptimizeNone:
  handleOptimizeNoneAttr(S, D, Attr);
  break;
case AttributeList::AT_FlagEnum:
  handleSimpleAttribute<FlagEnumAttr>(S, D, Attr);
  break;
case AttributeList::AT_EnumExtensibility:
  handleEnumExtensibilityAttr(S, D, Attr);
  break;
case AttributeList::AT_Flatten:
  handleSimpleAttribute<FlattenAttr>(S, D, Attr);
  break;
case AttributeList::AT_Format:
  handleFormatAttr(S, D, Attr);
  break;
case AttributeList::AT_FormatArg:
  handleFormatArgAttr(S, D, Attr);
  break;
case AttributeList::AT_CUDAGlobal:
  handleGlobalAttr(S, D, Attr);
  break;
case AttributeList::AT_CUDADevice:
  handleSimpleAttributeWithExclusions<CUDADeviceAttr, CUDAGlobalAttr>(S, D,
                                                                      Attr);
  break;
case AttributeList::AT_CUDAHost:
  handleSimpleAttributeWithExclusions<CUDAHostAttr, CUDAGlobalAttr>(S, D,
                                                                    Attr);
  break;
case AttributeList::AT_GNUInline:
  handleGNUInlineAttr(S, D, Attr);
  break;
case AttributeList::AT_CUDALaunchBounds:
  handleLaunchBoundsAttr(S, D, Attr);
  break;
case AttributeList::AT_Restrict:
  handleRestrictAttr(S, D, Attr);
  break;
case AttributeList::AT_MayAlias:
  handleSimpleAttribute<MayAliasAttr>(S, D, Attr);
  break;
case AttributeList::AT_Mode:
  handleModeAttr(S, D, Attr);
  break;
case AttributeList::AT_NoAlias:
  handleSimpleAttribute<NoAliasAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoCommon:
  handleSimpleAttribute<NoCommonAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoSplitStack:
  handleSimpleAttribute<NoSplitStackAttr>(S, D, Attr);
  break;
case AttributeList::AT_NonNull:
  if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(D))
    handleNonNullAttrParameter(S, PVD, Attr);
  else
    handleNonNullAttr(S, D, Attr);
  break;
case AttributeList::AT_ReturnsNonNull:
  handleReturnsNonNullAttr(S, D, Attr);
  break;
case AttributeList::AT_NoEscape:
  handleNoEscapeAttr(S, D, Attr);
  break;
case AttributeList::AT_AssumeAligned:
  handleAssumeAlignedAttr(S, D, Attr);
  break;
case AttributeList::AT_AllocAlign:
  handleAllocAlignAttr(S, D, Attr);
  break;
case AttributeList::AT_Overloadable:
  handleSimpleAttribute<OverloadableAttr>(S, D, Attr);
  break;
case AttributeList::AT_Ownership:
  handleOwnershipAttr(S, D, Attr);
  break;
case AttributeList::AT_Cold:
  handleColdAttr(S, D, Attr);
  break;
case AttributeList::AT_Hot:
  handleHotAttr(S, D, Attr);
  break;
case AttributeList::AT_Naked:
  handleNakedAttr(S, D, Attr);
  break;
case AttributeList::AT_NoReturn:
  handleNoReturnAttr(S, D, Attr);
  break;
case AttributeList::AT_NoThrow:
  handleSimpleAttribute<NoThrowAttr>(S, D, Attr);
  break;
case AttributeList::AT_CUDAShared:
  handleSharedAttr(S, D, Attr);
  break;
case AttributeList::AT_VecReturn:
  handleVecReturnAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCOwnership:
  handleObjCOwnershipAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCPreciseLifetime:
  handleObjCPreciseLifetimeAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCReturnsInnerPointer:
  handleObjCReturnsInnerPointerAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCRequiresSuper:
  handleObjCRequiresSuperAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCBridge:
  handleObjCBridgeAttr(S, scope, D, Attr);
  break;
case AttributeList::AT_ObjCBridgeMutable:
  handleObjCBridgeMutableAttr(S, scope, D, Attr);
  break;
case AttributeList::AT_ObjCBridgeRelated:
  handleObjCBridgeRelatedAttr(S, scope, D, Attr);
  break;
case AttributeList::AT_ObjCDesignatedInitializer:
  handleObjCDesignatedInitializer(S, D, Attr);
  break;
case AttributeList::AT_ObjCRuntimeName:
  handleObjCRuntimeName(S, D, Attr);
  break;
 case AttributeList::AT_ObjCRuntimeVisible:
  handleSimpleAttribute<ObjCRuntimeVisibleAttr>(S, D, Attr);
  break;
case AttributeList::AT_ObjCBoxable:
  handleObjCBoxable(S, D, Attr);
  break;
case AttributeList::AT_CFAuditedTransfer:
  handleCFAuditedTransferAttr(S, D, Attr);
  break;
case AttributeList::AT_CFUnknownTransfer:
  handleCFUnknownTransferAttr(S, D, Attr);
  break;
case AttributeList::AT_CFConsumed:
case AttributeList::AT_NSConsumed:
  handleNSConsumedAttr(S, D, Attr);
  break;
case AttributeList::AT_NSConsumesSelf:
  handleSimpleAttribute<NSConsumesSelfAttr>(S, D, Attr);
  break;
case AttributeList::AT_NSReturnsAutoreleased:
case AttributeList::AT_NSReturnsNotRetained:
case AttributeList::AT_CFReturnsNotRetained:
case AttributeList::AT_NSReturnsRetained:
case AttributeList::AT_CFReturnsRetained:
  handleNSReturnsRetainedAttr(S, D, Attr);
  break;
case AttributeList::AT_WorkGroupSizeHint:
  handleWorkGroupSize<WorkGroupSizeHintAttr>(S, D, Attr);
  break;
case AttributeList::AT_ReqdWorkGroupSize:
  handleWorkGroupSize<ReqdWorkGroupSizeAttr>(S, D, Attr);
  break;
case AttributeList::AT_OpenCLIntelReqdSubGroupSize:
  handleSubGroupSize(S, D, Attr);
  break;
case AttributeList::AT_VecTypeHint:
  handleVecTypeHint(S, D, Attr);
  break;
case AttributeList::AT_RequireConstantInit:
  handleSimpleAttribute<RequireConstantInitAttr>(S, D, Attr);
  break;
case AttributeList::AT_InitPriority:
  handleInitPriorityAttr(S, D, Attr);
  break;
case AttributeList::AT_Packed:
  handlePackedAttr(S, D, Attr);
  break;
case AttributeList::AT_Section:
  handleSectionAttr(S, D, Attr);
  break;
case AttributeList::AT_Target:
  handleTargetAttr(S, D, Attr);
  break;
case AttributeList::AT_Unavailable:
  handleAttrWithMessage<UnavailableAttr>(S, D, Attr);
  break;
case AttributeList::AT_ArcWeakrefUnavailable:
  handleSimpleAttribute<ArcWeakrefUnavailableAttr>(S, D, Attr);
  break;
case AttributeList::AT_ObjCRootClass:
  handleSimpleAttribute<ObjCRootClassAttr>(S, D, Attr);
  break;
case AttributeList::AT_ObjCSubclassingRestricted:
  handleSimpleAttribute<ObjCSubclassingRestrictedAttr>(S, D, Attr);
  break;
case AttributeList::AT_ObjCExplicitProtocolImpl:
  handleObjCSuppresProtocolAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCRequiresPropertyDefs:
  handleSimpleAttribute<ObjCRequiresPropertyDefsAttr>(S, D, Attr);
  break;
case AttributeList::AT_Unused:
  handleUnusedAttr(S, D, Attr);
  break;
case AttributeList::AT_ReturnsTwice:
  handleSimpleAttribute<ReturnsTwiceAttr>(S, D, Attr);
  break;
case AttributeList::AT_NotTailCalled:
  handleNotTailCalledAttr(S, D, Attr);
  break;
case AttributeList::AT_DisableTailCalls:
  handleDisableTailCallsAttr(S, D, Attr);
  break;
case AttributeList::AT_Used:
  handleUsedAttr(S, D, Attr);
  break;
case AttributeList::AT_Visibility:
  handleVisibilityAttr(S, D, Attr, false);
  break;
case AttributeList::AT_TypeVisibility:
  handleVisibilityAttr(S, D, Attr, true);
  break;
case AttributeList::AT_WarnUnused:
  handleSimpleAttribute<WarnUnusedAttr>(S, D, Attr);
  break;
case AttributeList::AT_WarnUnusedResult:
  handleWarnUnusedResult(S, D, Attr);
  break;
case AttributeList::AT_Weak:
  handleSimpleAttribute<WeakAttr>(S, D, Attr);
  break;
case AttributeList::AT_WeakRef:
  handleWeakRefAttr(S, D, Attr);
  break;
case AttributeList::AT_WeakImport:
  handleWeakImportAttr(S, D, Attr);
  break;
case AttributeList::AT_TransparentUnion:
  handleTransparentUnionAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCException:
  handleSimpleAttribute<ObjCExceptionAttr>(S, D, Attr);
  break;
case AttributeList::AT_ObjCMethodFamily:
  handleObjCMethodFamilyAttr(S, D, Attr);
  break;
case AttributeList::AT_ObjCNSObject:
  handleObjCNSObject(S, D, Attr);
  break;
case AttributeList::AT_ObjCIndependentClass:
  handleObjCIndependentClass(S, D, Attr);
  break;
case AttributeList::AT_Blocks:
  handleBlocksAttr(S, D, Attr);
  break;
case AttributeList::AT_Sentinel:
  handleSentinelAttr(S, D, Attr);
  break;
case AttributeList::AT_Const:
  handleSimpleAttribute<ConstAttr>(S, D, Attr);
  break;
case AttributeList::AT_Pure:
  handleSimpleAttribute<PureAttr>(S, D, Attr);
  break;
case AttributeList::AT_Cleanup:
  handleCleanupAttr(S, D, Attr);
  break;
case AttributeList::AT_NoDebug:
  handleNoDebugAttr(S, D, Attr);
  break;
case AttributeList::AT_NoDuplicate:
  handleSimpleAttribute<NoDuplicateAttr>(S, D, Attr);
  break;
case AttributeList::AT_Convergent:
  handleSimpleAttribute<ConvergentAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoInline:
  handleSimpleAttribute<NoInlineAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoInstrumentFunction: // Interacts with -pg.
  handleSimpleAttribute<NoInstrumentFunctionAttr>(S, D, Attr);
  break;
case AttributeList::AT_StdCall:
case AttributeList::AT_CDecl:
case AttributeList::AT_FastCall:
case AttributeList::AT_ThisCall:
case AttributeList::AT_Pascal:
case AttributeList::AT_RegCall:
case AttributeList::AT_SwiftCall:
case AttributeList::AT_VectorCall:
case AttributeList::AT_MSABI:
case AttributeList::AT_SysVABI:
case AttributeList::AT_Pcs:
case AttributeList::AT_IntelOclBicc:
case AttributeList::AT_PreserveMost:
case AttributeList::AT_PreserveAll:
  handleCallConvAttr(S, D, Attr);
  break;
case AttributeList::AT_Suppress:
  handleSuppressAttr(S, D, Attr);
  break;
case AttributeList::AT_OpenCLKernel:
  handleSimpleAttribute<OpenCLKernelAttr>(S, D, Attr);
  break;
case AttributeList::AT_OpenCLAccess:
  handleOpenCLAccessAttr(S, D, Attr);
  break;
case AttributeList::AT_OpenCLNoSVM:
  handleOpenCLNoSVMAttr(S, D, Attr);
  break;
case AttributeList::AT_SwiftContext:
  handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftContext);
  break;
case AttributeList::AT_SwiftErrorResult:
  handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftErrorResult);
  break;
case AttributeList::AT_SwiftIndirectResult:
  handleParameterABIAttr(S, D, Attr, ParameterABI::SwiftIndirectResult);
  break;
case AttributeList::AT_InternalLinkage:
  handleInternalLinkageAttr(S, D, Attr);
  break;
case AttributeList::AT_LTOVisibilityPublic:
  handleSimpleAttribute<LTOVisibilityPublicAttr>(S, D, Attr);
  break;

// Microsoft attributes:
case AttributeList::AT_EmptyBases:
  handleSimpleAttribute<EmptyBasesAttr>(S, D, Attr);
  break;
case AttributeList::AT_LayoutVersion:
  handleLayoutVersion(S, D, Attr);
  break;
case AttributeList::AT_TrivialABI:
  handleSimpleAttribute<TrivialABIAttr>(S, D, Attr);
  break;
case AttributeList::AT_MSNoVTable:
  handleSimpleAttribute<MSNoVTableAttr>(S, D, Attr);
  break;
case AttributeList::AT_MSStruct:
  handleSimpleAttribute<MSStructAttr>(S, D, Attr);
  break;
case AttributeList::AT_Uuid:
  handleUuidAttr(S, D, Attr);
  break;
case AttributeList::AT_MSInheritance:
  handleMSInheritanceAttr(S, D, Attr);
  break;
case AttributeList::AT_SelectAny:
  handleSimpleAttribute<SelectAnyAttr>(S, D, Attr);
  break;
case AttributeList::AT_Thread:
  handleDeclspecThreadAttr(S, D, Attr);
  break;

case AttributeList::AT_AbiTag:
  handleAbiTagAttr(S, D, Attr);
  break;

// Thread safety attributes:
case AttributeList::AT_AssertExclusiveLock:
  handleAssertExclusiveLockAttr(S, D, Attr);
  break;
case AttributeList::AT_AssertSharedLock:
  handleAssertSharedLockAttr(S, D, Attr);
  break;
case AttributeList::AT_GuardedVar:
  handleSimpleAttribute<GuardedVarAttr>(S, D, Attr);
  break;
case AttributeList::AT_PtGuardedVar:
  handlePtGuardedVarAttr(S, D, Attr);
  break;
case AttributeList::AT_ScopedLockable:
  handleSimpleAttribute<ScopedLockableAttr>(S, D, Attr);
  break;
case AttributeList::AT_NoSanitize:
  handleNoSanitizeAttr(S, D, Attr);
  break;
case AttributeList::AT_NoSanitizeSpecific:
  handleNoSanitizeSpecificAttr(S, D, Attr);
  break;
case AttributeList::AT_NoThreadSafetyAnalysis:
  handleSimpleAttribute<NoThreadSafetyAnalysisAttr>(S, D, Attr);
  break;
case AttributeList::AT_GuardedBy:
  handleGuardedByAttr(S, D, Attr);
  break;
case AttributeList::AT_PtGuardedBy:
  handlePtGuardedByAttr(S, D, Attr);
  break;
case AttributeList::AT_ExclusiveTrylockFunction:
  handleExclusiveTrylockFunctionAttr(S, D, Attr);
  break;
case AttributeList::AT_LockReturned:
  handleLockReturnedAttr(S, D, Attr);
  break;
case AttributeList::AT_LocksExcluded:
  handleLocksExcludedAttr(S, D, Attr);
  break;
case AttributeList::AT_SharedTrylockFunction:
  handleSharedTrylockFunctionAttr(S, D, Attr);
  break;
case AttributeList::AT_AcquiredBefore:
  handleAcquiredBeforeAttr(S, D, Attr);
  break;
case AttributeList::AT_AcquiredAfter:
  handleAcquiredAfterAttr(S, D, Attr);
  break;

// Capability analysis attributes.
case AttributeList::AT_Capability:
case AttributeList::AT_Lockable:
  handleCapabilityAttr(S, D, Attr);
  break;
case AttributeList::AT_RequiresCapability:
  handleRequiresCapabilityAttr(S, D, Attr);
  break;

case AttributeList::AT_AssertCapability:
  handleAssertCapabilityAttr(S, D, Attr);
  break;
case AttributeList::AT_AcquireCapability:
  handleAcquireCapabilityAttr(S, D, Attr);
  break;
case AttributeList::AT_ReleaseCapability:
  handleReleaseCapabilityAttr(S, D, Attr);
  break;
case AttributeList::AT_TryAcquireCapability:
  handleTryAcquireCapabilityAttr(S, D, Attr);
  break;

// Consumed analysis attributes.
case AttributeList::AT_Consumable:
  handleConsumableAttr(S, D, Attr);
  break;
case AttributeList::AT_ConsumableAutoCast:
  handleSimpleAttribute<ConsumableAutoCastAttr>(S, D, Attr);
  break;
case AttributeList::AT_ConsumableSetOnRead:
  handleSimpleAttribute<ConsumableSetOnReadAttr>(S, D, Attr);
  break;
case AttributeList::AT_CallableWhen:
  handleCallableWhenAttr(S, D, Attr);
  break;
case AttributeList::AT_ParamTypestate:
  handleParamTypestateAttr(S, D, Attr);
  break;
case AttributeList::AT_ReturnTypestate:
  handleReturnTypestateAttr(S, D, Attr);
  break;
case AttributeList::AT_SetTypestate:
  handleSetTypestateAttr(S, D, Attr);
  break;
case AttributeList::AT_TestTypestate:
  handleTestTypestateAttr(S, D, Attr);
  break;

// Type safety attributes.
case AttributeList::AT_ArgumentWithTypeTag:
  handleArgumentWithTypeTagAttr(S, D, Attr);
  break;
case AttributeList::AT_TypeTagForDatatype:
  handleTypeTagForDatatypeAttr(S, D, Attr);
  break;
case AttributeList::AT_AnyX86NoCallerSavedRegisters:
  handleNoCallerSavedRegsAttr(S, D, Attr);
  break;
case AttributeList::AT_RenderScriptKernel:
  handleSimpleAttribute<RenderScriptKernelAttr>(S, D, Attr);
  break;
// XRay attributes.
case AttributeList::AT_XRayInstrument:
  handleSimpleAttribute<XRayInstrumentAttr>(S, D, Attr);
  break;
case AttributeList::AT_XRayLogArgs:
  handleXRayLogArgsAttr(S, D, Attr);
  break;
}
6587}

6589/// ProcessDeclAttributeList - Apply all the decl attributes in the specified
6590/// attribute list to the specified decl, ignoring any type attributes.
6591void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
                                  const AttributeList *AttrList,
                                  bool IncludeCXX11Attributes) {
for (const AttributeList* l = AttrList; l; l = l->getNext())
  ProcessDeclAttribute(*this, S, D, *l, IncludeCXX11Attributes);

// FIXME: We should be able to handle these cases in TableGen.
// GCC accepts
// static int a9 __attribute__((weakref));
// but that looks really pointless. We reject it.
if (D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) {
  Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias)
    << cast<NamedDecl>(D);
  D->dropAttr<WeakRefAttr>();
  return;
}

// FIXME: We should be able to handle this in TableGen as well. It would be
// good to have a way to specify "these attributes must appear as a group",
// for these. Additionally, it would be good to have a way to specify "these
// attribute must never appear as a group" for attributes like cold and hot.
if (!D->hasAttr<OpenCLKernelAttr>()) {
  // These attributes cannot be applied to a non-kernel function.
  if (Attr *A = D->getAttr<ReqdWorkGroupSizeAttr>()) {
    // FIXME: This emits a different error message than
    // diag::err_attribute_wrong_decl_type + ExpectedKernelFunction.
    Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<WorkGroupSizeHintAttr>()) {
    Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<VecTypeHintAttr>()) {
    Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<AMDGPUFlatWorkGroupSizeAttr>()) {
    Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
      << A << ExpectedKernelFunction;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<AMDGPUWavesPerEUAttr>()) {
    Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
      << A << ExpectedKernelFunction;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<AMDGPUNumSGPRAttr>()) {
    Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
      << A << ExpectedKernelFunction;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<AMDGPUNumVGPRAttr>()) {
    Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
      << A << ExpectedKernelFunction;
    D->setInvalidDecl();
  } else if (Attr *A = D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>()) {
    Diag(D->getLocation(), diag::err_opencl_kernel_attr) << A;
    D->setInvalidDecl();
  }
}
6646}

6648// Helper for delayed processing TransparentUnion attribute.
6649void Sema::ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList) {
for (const AttributeList *Attr = AttrList; Attr; Attr = Attr->getNext())
  if (Attr->getKind() == AttributeList::AT_TransparentUnion) {
    handleTransparentUnionAttr(*this, D, *Attr);
    break;
  }
6655}

6657// Annotation attributes are the only attributes allowed after an access
6658// specifier.
6659bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
                                        const AttributeList *AttrList) {
for (const AttributeList* l = AttrList; l; l = l->getNext()) {
  if (l->getKind() == AttributeList::AT_Annotate) {
    ProcessDeclAttribute(*this, nullptr, ASDecl, *l, l->isCXX11Attribute());
  } else {
    Diag(l->getLoc(), diag::err_only_annotate_after_access_spec);
    return true;
  }
}

return false;
6671}

6673/// checkUnusedDeclAttributes - Check a list of attributes to see if it
6674/// contains any decl attributes that we should warn about.
6675static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) {
for ( ; A; A = A->getNext()) {
  // Only warn if the attribute is an unignored, non-type attribute.
  if (A->isUsedAsTypeAttr() || A->isInvalid()) continue;
  if (A->getKind() == AttributeList::IgnoredAttribute) continue;

  if (A->getKind() == AttributeList::UnknownAttribute) {
    S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored)
      << A->getName() << A->getRange();
  } else {
    S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl)
      << A->getName() << A->getRange();
  }
}
6689}

6691/// checkUnusedDeclAttributes - Given a declarator which is not being
6692/// used to build a declaration, complain about any decl attributes
6693/// which might be lying around on it.
6694void Sema::checkUnusedDeclAttributes(Declarator &D) {
::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList());
::checkUnusedDeclAttributes(*this, D.getAttributes());
for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i)
  ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs());
6699}

6701/// DeclClonePragmaWeak - clone existing decl (maybe definition),
6702/// \#pragma weak needs a non-definition decl and source may not have one.
6703NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
                                    SourceLocation Loc) {
assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND))(static_cast <bool> (isa<FunctionDecl>(ND) || isa
<VarDecl>(ND)) ? void (0) : __assert_fail ("isa<FunctionDecl>(ND) || isa<VarDecl>(ND)"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 6705, __extension__ __PRETTY_FUNCTION__));
NamedDecl *NewD = nullptr;
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
  FunctionDecl *NewFD;
  // FIXME: Missing call to CheckFunctionDeclaration().
  // FIXME: Mangling?
  // FIXME: Is the qualifier info correct?
  // FIXME: Is the DeclContext correct?
  NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(),
                               Loc, Loc, DeclarationName(II),
                               FD->getType(), FD->getTypeSourceInfo(),
                               SC_None, false/*isInlineSpecified*/,
                               FD->hasPrototype(),
                               false/*isConstexprSpecified*/);
  NewD = NewFD;

  if (FD->getQualifier())
    NewFD->setQualifierInfo(FD->getQualifierLoc());

  // Fake up parameter variables; they are declared as if this were
  // a typedef.
  QualType FDTy = FD->getType();
  if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) {
    SmallVector<ParmVarDecl*, 16> Params;
    for (const auto &AI : FT->param_types()) {
      ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, AI);
      Param->setScopeInfo(0, Params.size());
      Params.push_back(Param);
    }
    NewFD->setParams(Params);
  }
} else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) {
  NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(),
                         VD->getInnerLocStart(), VD->getLocation(), II,
                         VD->getType(), VD->getTypeSourceInfo(),
                         VD->getStorageClass());
  if (VD->getQualifier()) {
    VarDecl *NewVD = cast<VarDecl>(NewD);
    NewVD->setQualifierInfo(VD->getQualifierLoc());
  }
}
return NewD;
6747}

6749/// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak
6750/// applied to it, possibly with an alias.
6751void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
if (W.getUsed()) return; // only do this once
W.setUsed(true);
if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
  IdentifierInfo *NDId = ND->getIdentifier();
  NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation());
  NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(),
                                          W.getLocation()));
  NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
  WeakTopLevelDecl.push_back(NewD);
  // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
  // to insert Decl at TU scope, sorry.
  DeclContext *SavedContext = CurContext;
  CurContext = Context.getTranslationUnitDecl();
  NewD->setDeclContext(CurContext);
  NewD->setLexicalDeclContext(CurContext);
  PushOnScopeChains(NewD, S);
  CurContext = SavedContext;
} else { // just add weak to existing
  ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
}
6772}

6774void Sema::ProcessPragmaWeak(Scope *S, Decl *D) {
// It's valid to "forward-declare" #pragma weak, in which case we
// have to do this.
LoadExternalWeakUndeclaredIdentifiers();
if (!WeakUndeclaredIdentifiers.empty()) {
  NamedDecl *ND = nullptr;
  if (VarDecl *VD = dyn_cast<VarDecl>(D))
    if (VD->isExternC())
      ND = VD;
  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
    if (FD->isExternC())
      ND = FD;
  if (ND) {
    if (IdentifierInfo *Id = ND->getIdentifier()) {
      auto I = WeakUndeclaredIdentifiers.find(Id);
      if (I != WeakUndeclaredIdentifiers.end()) {
        WeakInfo W = I->second;
        DeclApplyPragmaWeak(S, ND, W);
        WeakUndeclaredIdentifiers[Id] = W;
      }
    }
  }
}
6797}

6799/// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in
6800/// it, apply them to D.  This is a bit tricky because PD can have attributes
6801/// specified in many different places, and we need to find and apply them all.
6802void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD) {
// Apply decl attributes from the DeclSpec if present.
if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList())
  ProcessDeclAttributeList(S, D, Attrs);

// Walk the declarator structure, applying decl attributes that were in a type
// position to the decl itself.  This handles cases like:
//   int *__attr__(x)** D;
// when X is a decl attribute.
for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i)
  if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs())
    ProcessDeclAttributeList(S, D, Attrs, /*IncludeCXX11Attributes=*/false);

// Finally, apply any attributes on the decl itself.
if (const AttributeList *Attrs = PD.getAttributes())
  ProcessDeclAttributeList(S, D, Attrs);

// Apply additional attributes specified by '#pragma clang attribute'.
AddPragmaAttributes(S, D);
6821}

6823/// Is the given declaration allowed to use a forbidden type?
6824/// If so, it'll still be annotated with an attribute that makes it
6825/// illegal to actually use.
6826static bool isForbiddenTypeAllowed(Sema &S, Decl *decl,
                                 const DelayedDiagnostic &diag,
                                 UnavailableAttr::ImplicitReason &reason) {
// Private ivars are always okay.  Unfortunately, people don't
// always properly make their ivars private, even in system headers.
// Plus we need to make fields okay, too.
if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) &&
    !isa<FunctionDecl>(decl))
  return false;

// Silently accept unsupported uses of __weak in both user and system
// declarations when it's been disabled, for ease of integration with
// -fno-objc-arc files.  We do have to take some care against attempts
// to define such things;  for now, we've only done that for ivars
// and properties.
if ((isa<ObjCIvarDecl>(decl) || isa<ObjCPropertyDecl>(decl))) {
  if (diag.getForbiddenTypeDiagnostic() == diag::err_arc_weak_disabled ||
      diag.getForbiddenTypeDiagnostic() == diag::err_arc_weak_no_runtime) {
    reason = UnavailableAttr::IR_ForbiddenWeak;
    return true;
  }
}

// Allow all sorts of things in system headers.
if (S.Context.getSourceManager().isInSystemHeader(decl->getLocation())) {
  // Currently, all the failures dealt with this way are due to ARC
  // restrictions.
  reason = UnavailableAttr::IR_ARCForbiddenType;
  return true;
}

return false;
6858}

6860/// Handle a delayed forbidden-type diagnostic.
6861static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag,
                                     Decl *decl) {
auto reason = UnavailableAttr::IR_None;
if (decl && isForbiddenTypeAllowed(S, decl, diag, reason)) {
  assert(reason && "didn't set reason?")(static_cast <bool> (reason && "didn't set reason?"
) ? void (0) : __assert_fail ("reason && \"didn't set reason?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 6865, __extension__ __PRETTY_FUNCTION__));
  decl->addAttr(UnavailableAttr::CreateImplicit(S.Context, "", reason,
                                                diag.Loc));
  return;
}
if (S.getLangOpts().ObjCAutoRefCount)
  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) {
    // FIXME: we may want to suppress diagnostics for all
    // kind of forbidden type messages on unavailable functions. 
    if (FD->hasAttr<UnavailableAttr>() &&
        diag.getForbiddenTypeDiagnostic() == 
        diag::err_arc_array_param_no_ownership) {
      diag.Triggered = true;
      return;
    }
  }

S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())
  << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument();
diag.Triggered = true;
6885}

6887static const AvailabilityAttr *getAttrForPlatform(ASTContext &Context,
                                                const Decl *D) {
// Check each AvailabilityAttr to find the one for this platform.
for (const auto *A : D->attrs()) {
  if (const auto *Avail = dyn_cast<AvailabilityAttr>(A)) {
    // FIXME: this is copied from CheckAvailability. We should try to
    // de-duplicate.

    // Check if this is an App Extension "platform", and if so chop off
    // the suffix for matching with the actual platform.
    StringRef ActualPlatform = Avail->getPlatform()->getName();
    StringRef RealizedPlatform = ActualPlatform;
    if (Context.getLangOpts().AppExt) {
      size_t suffix = RealizedPlatform.rfind("_app_extension");
      if (suffix != StringRef::npos)
        RealizedPlatform = RealizedPlatform.slice(0, suffix);
    }

    StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();

    // Match the platform name.
    if (RealizedPlatform == TargetPlatform)
      return Avail;
  }
}
return nullptr;
6913}

6915/// The diagnostic we should emit for \c D, and the declaration that
6916/// originated it, or \c AR_Available.
6917///
6918/// \param D The declaration to check.
6919/// \param Message If non-null, this will be populated with the message from
6920/// the availability attribute that is selected.
6921static std::pair<AvailabilityResult, const NamedDecl *>
6922ShouldDiagnoseAvailabilityOfDecl(const NamedDecl *D, std::string *Message) {
AvailabilityResult Result = D->getAvailability(Message);

// For typedefs, if the typedef declaration appears available look
// to the underlying type to see if it is more restrictive.
while (const TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
  if (Result == AR_Available) {
    if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
      D = TT->getDecl();
      Result = D->getAvailability(Message);
      continue;
    }
  }
  break;
}

// Forward class declarations get their attributes from their definition.
if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(D)) {
  if (IDecl->getDefinition()) {
    D = IDecl->getDefinition();
    Result = D->getAvailability(Message);
  }
}

if (const auto *ECD = dyn_cast<EnumConstantDecl>(D))
  if (Result == AR_Available) {
    const DeclContext *DC = ECD->getDeclContext();
    if (const auto *TheEnumDecl = dyn_cast<EnumDecl>(DC)) {
      Result = TheEnumDecl->getAvailability(Message);
      D = TheEnumDecl;
    }
  }

return {Result, D};
6956}


6959/// \brief whether we should emit a diagnostic for \c K and \c DeclVersion in
6960/// the context of \c Ctx. For example, we should emit an unavailable diagnostic
6961/// in a deprecated context, but not the other way around.
6962static bool ShouldDiagnoseAvailabilityInContext(Sema &S, AvailabilityResult K,
                                              VersionTuple DeclVersion,
                                              Decl *Ctx) {
assert(K != AR_Available && "Expected an unavailable declaration here!")(static_cast <bool> (K != AR_Available && "Expected an unavailable declaration here!"
) ? void (0) : __assert_fail ("K != AR_Available && \"Expected an unavailable declaration here!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 6965, __extension__ __PRETTY_FUNCTION__));

// Checks if we should emit the availability diagnostic in the context of C.
auto CheckContext = [&](const Decl *C) {
  if (K == AR_NotYetIntroduced) {
    if (const AvailabilityAttr *AA = getAttrForPlatform(S.Context, C))
      if (AA->getIntroduced() >= DeclVersion)
        return true;
  } else if (K == AR_Deprecated)
    if (C->isDeprecated())
      return true;

  if (C->isUnavailable())
    return true;
  return false;
};

// FIXME: This is a temporary workaround! Some existing Apple headers depends
// on nested declarations in an @interface having the availability of the
// interface when they really shouldn't: they are members of the enclosing
// context, and can referenced from there.
if (S.OriginalLexicalContext && cast<Decl>(S.OriginalLexicalContext) != Ctx) {
  auto *OrigCtx = cast<Decl>(S.OriginalLexicalContext);
  if (CheckContext(OrigCtx))
    return false;

  // An implementation implicitly has the availability of the interface.
  if (auto *CatOrImpl = dyn_cast<ObjCImplDecl>(OrigCtx)) {
    if (const ObjCInterfaceDecl *Interface = CatOrImpl->getClassInterface())
      if (CheckContext(Interface))
        return false;
  }
  // A category implicitly has the availability of the interface.
  else if (auto *CatD = dyn_cast<ObjCCategoryDecl>(OrigCtx))
    if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
      if (CheckContext(Interface))
        return false;
}

do {
  if (CheckContext(Ctx))
    return false;

  // An implementation implicitly has the availability of the interface.
  if (auto *CatOrImpl = dyn_cast<ObjCImplDecl>(Ctx)) {
    if (const ObjCInterfaceDecl *Interface = CatOrImpl->getClassInterface())
      if (CheckContext(Interface))
        return false;
  }
  // A category implicitly has the availability of the interface.
  else if (auto *CatD = dyn_cast<ObjCCategoryDecl>(Ctx))
    if (const ObjCInterfaceDecl *Interface = CatD->getClassInterface())
      if (CheckContext(Interface))
        return false;
} while ((Ctx = cast_or_null<Decl>(Ctx->getDeclContext())));

return true;
7022}

7024static bool
7025shouldDiagnoseAvailabilityByDefault(const ASTContext &Context,
                                  const VersionTuple &DeploymentVersion,
                                  const VersionTuple &DeclVersion) {
const auto &Triple = Context.getTargetInfo().getTriple();
VersionTuple ForceAvailabilityFromVersion;
switch (Triple.getOS()) {
case llvm::Triple::IOS:
case llvm::Triple::TvOS:
  ForceAvailabilityFromVersion = VersionTuple(/*Major=*/11);
  break;
case llvm::Triple::WatchOS:
  ForceAvailabilityFromVersion = VersionTuple(/*Major=*/4);
  break;
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX:
  ForceAvailabilityFromVersion = VersionTuple(/*Major=*/10, /*Minor=*/13);
  break;
default:
  // New targets should always warn about availability.
  return Triple.getVendor() == llvm::Triple::Apple;
}
return DeploymentVersion >= ForceAvailabilityFromVersion ||
       DeclVersion >= ForceAvailabilityFromVersion;
7048}

7050static NamedDecl *findEnclosingDeclToAnnotate(Decl *OrigCtx) {
for (Decl *Ctx = OrigCtx; Ctx;
     Ctx = cast_or_null<Decl>(Ctx->getDeclContext())) {
  if (isa<TagDecl>(Ctx) || isa<FunctionDecl>(Ctx) || isa<ObjCMethodDecl>(Ctx))
    return cast<NamedDecl>(Ctx);
  if (auto *CD = dyn_cast<ObjCContainerDecl>(Ctx)) {
    if (auto *Imp = dyn_cast<ObjCImplDecl>(Ctx))
      return Imp->getClassInterface();
    return CD;
  }
}

return dyn_cast<NamedDecl>(OrigCtx);
7063}

7065namespace {

7067struct AttributeInsertion {
StringRef Prefix;
SourceLocation Loc;
StringRef Suffix;

static AttributeInsertion createInsertionAfter(const NamedDecl *D) {
  return {" ", D->getLocEnd(), ""};
}
static AttributeInsertion createInsertionAfter(SourceLocation Loc) {
  return {" ", Loc, ""};
}
static AttributeInsertion createInsertionBefore(const NamedDecl *D) {
  return {"", D->getLocStart(), "\n"};
}
7081};

7083} // end anonymous namespace

7085/// Returns a source location in which it's appropriate to insert a new
7086/// attribute for the given declaration \D.
7087static Optional<AttributeInsertion>
7088createAttributeInsertion(const NamedDecl *D, const SourceManager &SM,
                       const LangOptions &LangOpts) {
if (isa<ObjCPropertyDecl>(D))
  return AttributeInsertion::createInsertionAfter(D);
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
  if (MD->hasBody())
    return None;
  return AttributeInsertion::createInsertionAfter(D);
}
if (const auto *TD = dyn_cast<TagDecl>(D)) {
  SourceLocation Loc =
      Lexer::getLocForEndOfToken(TD->getInnerLocStart(), 0, SM, LangOpts);
  if (Loc.isInvalid())
    return None;
  // Insert after the 'struct'/whatever keyword.
  return AttributeInsertion::createInsertionAfter(Loc);
}
return AttributeInsertion::createInsertionBefore(D);
7106}

7108/// Actually emit an availability diagnostic for a reference to an unavailable
7109/// decl.
7110///
7111/// \param Ctx The context that the reference occurred in
7112/// \param ReferringDecl The exact declaration that was referenced.
7113/// \param OffendingDecl A related decl to \c ReferringDecl that has an
7114/// availability attribute corrisponding to \c K attached to it. Note that this
7115/// may not be the same as ReferringDecl, i.e. if an EnumDecl is annotated and
7116/// we refer to a member EnumConstantDecl, ReferringDecl is the EnumConstantDecl
7117/// and OffendingDecl is the EnumDecl.
7118static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K,
                                    Decl *Ctx, const NamedDecl *ReferringDecl,
                                    const NamedDecl *OffendingDecl,
                                    StringRef Message, SourceLocation Loc,
                                    const ObjCInterfaceDecl *UnknownObjCClass,
                                    const ObjCPropertyDecl *ObjCProperty,
                                    bool ObjCPropertyAccess) {
// Diagnostics for deprecated or unavailable.
unsigned diag, diag_message, diag_fwdclass_message;
unsigned diag_available_here = diag::note_availability_specified_here;
SourceLocation NoteLocation = OffendingDecl->getLocation();

// Matches 'diag::note_property_attribute' options.
unsigned property_note_select;

// Matches diag::note_availability_specified_here.
unsigned available_here_select_kind;

VersionTuple DeclVersion;
if (const AvailabilityAttr *AA = getAttrForPlatform(S.Context, OffendingDecl))
  DeclVersion = AA->getIntroduced();

if (!ShouldDiagnoseAvailabilityInContext(S, K, DeclVersion, Ctx))
  return;

// The declaration can have multiple availability attributes, we are looking
// at one of them.
const AvailabilityAttr *A = getAttrForPlatform(S.Context, OffendingDecl);
if (A && A->isInherited()) {
  for (const Decl *Redecl = OffendingDecl->getMostRecentDecl(); Redecl;
       Redecl = Redecl->getPreviousDecl()) {
    const AvailabilityAttr *AForRedecl =
        getAttrForPlatform(S.Context, Redecl);
    if (AForRedecl && !AForRedecl->isInherited()) {
      // If D is a declaration with inherited attributes, the note should
      // point to the declaration with actual attributes.
      NoteLocation = Redecl->getLocation();
      break;
    }
  }
}

switch (K) {
case AR_NotYetIntroduced: {
  // We would like to emit the diagnostic even if -Wunguarded-availability is
  // not specified for deployment targets >= to iOS 11 or equivalent or
  // for declarations that were introduced in iOS 11 (macOS 10.13, ...) or
  // later.
  const AvailabilityAttr *AA =
      getAttrForPlatform(S.getASTContext(), OffendingDecl);
  VersionTuple Introduced = AA->getIntroduced();

  bool UseNewWarning = shouldDiagnoseAvailabilityByDefault(
      S.Context, S.Context.getTargetInfo().getPlatformMinVersion(),
      Introduced);
  unsigned Warning = UseNewWarning ? diag::warn_unguarded_availability_new
                                   : diag::warn_unguarded_availability;

  S.Diag(Loc, Warning)
      << OffendingDecl
      << AvailabilityAttr::getPrettyPlatformName(
             S.getASTContext().getTargetInfo().getPlatformName())
      << Introduced.getAsString();

  S.Diag(OffendingDecl->getLocation(), diag::note_availability_specified_here)
      << OffendingDecl << /* partial */ 3;

  if (const auto *Enclosing = findEnclosingDeclToAnnotate(Ctx)) {
    if (auto *TD = dyn_cast<TagDecl>(Enclosing))
      if (TD->getDeclName().isEmpty()) {
        S.Diag(TD->getLocation(),
               diag::note_decl_unguarded_availability_silence)
            << /*Anonymous*/ 1 << TD->getKindName();
        return;
      }
    auto FixitNoteDiag =
        S.Diag(Enclosing->getLocation(),
               diag::note_decl_unguarded_availability_silence)
        << /*Named*/ 0 << Enclosing;
    // Don't offer a fixit for declarations with availability attributes.
    if (Enclosing->hasAttr<AvailabilityAttr>())
      return;
    if (!S.getPreprocessor().isMacroDefined("API_AVAILABLE"))
      return;
    Optional<AttributeInsertion> Insertion = createAttributeInsertion(
        Enclosing, S.getSourceManager(), S.getLangOpts());
    if (!Insertion)
      return;
    std::string PlatformName =
        AvailabilityAttr::getPlatformNameSourceSpelling(
            S.getASTContext().getTargetInfo().getPlatformName())
            .lower();
    std::string Introduced =
        OffendingDecl->getVersionIntroduced().getAsString();
    FixitNoteDiag << FixItHint::CreateInsertion(
        Insertion->Loc,
        (llvm::Twine(Insertion->Prefix) + "API_AVAILABLE(" + PlatformName +
         "(" + Introduced + "))" + Insertion->Suffix)
            .str());
  }
  return;
}
case AR_Deprecated:
  diag = !ObjCPropertyAccess ? diag::warn_deprecated
                             : diag::warn_property_method_deprecated;
  diag_message = diag::warn_deprecated_message;
  diag_fwdclass_message = diag::warn_deprecated_fwdclass_message;
  property_note_select = /* deprecated */ 0;
  available_here_select_kind = /* deprecated */ 2;
  if (const auto *Attr = OffendingDecl->getAttr<DeprecatedAttr>())
    NoteLocation = Attr->getLocation();
  break;

case AR_Unavailable:
  diag = !ObjCPropertyAccess ? diag::err_unavailable
                             : diag::err_property_method_unavailable;
  diag_message = diag::err_unavailable_message;
  diag_fwdclass_message = diag::warn_unavailable_fwdclass_message;
  property_note_select = /* unavailable */ 1;
  available_here_select_kind = /* unavailable */ 0;

  if (auto Attr = OffendingDecl->getAttr<UnavailableAttr>()) {
    if (Attr->isImplicit() && Attr->getImplicitReason()) {
      // Most of these failures are due to extra restrictions in ARC;
      // reflect that in the primary diagnostic when applicable.
      auto flagARCError = [&] {
        if (S.getLangOpts().ObjCAutoRefCount &&
            S.getSourceManager().isInSystemHeader(
                OffendingDecl->getLocation()))
          diag = diag::err_unavailable_in_arc;
      };

      switch (Attr->getImplicitReason()) {
      case UnavailableAttr::IR_None: break;

      case UnavailableAttr::IR_ARCForbiddenType:
        flagARCError();
        diag_available_here = diag::note_arc_forbidden_type;
        break;

      case UnavailableAttr::IR_ForbiddenWeak:
        if (S.getLangOpts().ObjCWeakRuntime)
          diag_available_here = diag::note_arc_weak_disabled;
        else
          diag_available_here = diag::note_arc_weak_no_runtime;
        break;

      case UnavailableAttr::IR_ARCForbiddenConversion:
        flagARCError();
        diag_available_here = diag::note_performs_forbidden_arc_conversion;
        break;

      case UnavailableAttr::IR_ARCInitReturnsUnrelated:
        flagARCError();
        diag_available_here = diag::note_arc_init_returns_unrelated;
        break;

      case UnavailableAttr::IR_ARCFieldWithOwnership:
        flagARCError();
        diag_available_here = diag::note_arc_field_with_ownership;
        break;
      }
    }
  }
  break;

case AR_Available:
  llvm_unreachable("Warning for availability of available declaration?")::llvm::llvm_unreachable_internal("Warning for availability of available declaration?"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7285);
}

CharSourceRange UseRange;
StringRef Replacement;
if (K == AR_Deprecated) {
  if (auto Attr = OffendingDecl->getAttr<DeprecatedAttr>())
    Replacement = Attr->getReplacement();
  if (auto Attr = getAttrForPlatform(S.Context, OffendingDecl))
    Replacement = Attr->getReplacement();

  if (!Replacement.empty())
    UseRange =
        CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
}

if (!Message.empty()) {
  S.Diag(Loc, diag_message) << ReferringDecl << Message
    << (UseRange.isValid() ?
        FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
  if (ObjCProperty)
    S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
        << ObjCProperty->getDeclName() << property_note_select;
} else if (!UnknownObjCClass) {
  S.Diag(Loc, diag) << ReferringDecl
    << (UseRange.isValid() ?
        FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
  if (ObjCProperty)
    S.Diag(ObjCProperty->getLocation(), diag::note_property_attribute)
        << ObjCProperty->getDeclName() << property_note_select;
} else {
  S.Diag(Loc, diag_fwdclass_message) << ReferringDecl
    << (UseRange.isValid() ?
        FixItHint::CreateReplacement(UseRange, Replacement) : FixItHint());
  S.Diag(UnknownObjCClass->getLocation(), diag::note_forward_class);
}

S.Diag(NoteLocation, diag_available_here)
  << OffendingDecl << available_here_select_kind;
7324}

7326static void handleDelayedAvailabilityCheck(Sema &S, DelayedDiagnostic &DD,
                                         Decl *Ctx) {
assert(DD.Kind == DelayedDiagnostic::Availability &&(static_cast <bool> (DD.Kind == DelayedDiagnostic::Availability
 && "Expected an availability diagnostic here") ? void
 (0) : __assert_fail ("DD.Kind == DelayedDiagnostic::Availability && \"Expected an availability diagnostic here\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7329, __extension__ __PRETTY_FUNCTION__))
       "Expected an availability diagnostic here")(static_cast <bool> (DD.Kind == DelayedDiagnostic::Availability
 && "Expected an availability diagnostic here") ? void
 (0) : __assert_fail ("DD.Kind == DelayedDiagnostic::Availability && \"Expected an availability diagnostic here\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7329, __extension__ __PRETTY_FUNCTION__));

DD.Triggered = true;
DoEmitAvailabilityWarning(
    S, DD.getAvailabilityResult(), Ctx, DD.getAvailabilityReferringDecl(),
    DD.getAvailabilityOffendingDecl(), DD.getAvailabilityMessage(), DD.Loc,
    DD.getUnknownObjCClass(), DD.getObjCProperty(), false);
7336}

7338void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
assert(DelayedDiagnostics.getCurrentPool())(static_cast <bool> (DelayedDiagnostics.getCurrentPool(
)) ? void (0) : __assert_fail ("DelayedDiagnostics.getCurrentPool()"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7339, __extension__ __PRETTY_FUNCTION__));
DelayedDiagnosticPool &poppedPool = *DelayedDiagnostics.getCurrentPool();
DelayedDiagnostics.popWithoutEmitting(state);

// When delaying diagnostics to run in the context of a parsed
// declaration, we only want to actually emit anything if parsing
// succeeds.
if (!decl) return;

// We emit all the active diagnostics in this pool or any of its
// parents.  In general, we'll get one pool for the decl spec
// and a child pool for each declarator; in a decl group like:
//   deprecated_typedef foo, *bar, baz();
// only the declarator pops will be passed decls.  This is correct;
// we really do need to consider delayed diagnostics from the decl spec
// for each of the different declarations.
const DelayedDiagnosticPool *pool = &poppedPool;
do {
  for (DelayedDiagnosticPool::pool_iterator
         i = pool->pool_begin(), e = pool->pool_end(); i != e; ++i) {
    // This const_cast is a bit lame.  Really, Triggered should be mutable.
    DelayedDiagnostic &diag = const_cast<DelayedDiagnostic&>(*i);
    if (diag.Triggered)
      continue;

    switch (diag.Kind) {
    case DelayedDiagnostic::Availability:
      // Don't bother giving deprecation/unavailable diagnostics if
      // the decl is invalid.
      if (!decl->isInvalidDecl())
        handleDelayedAvailabilityCheck(*this, diag, decl);
      break;

    case DelayedDiagnostic::Access:
      HandleDelayedAccessCheck(diag, decl);
      break;

    case DelayedDiagnostic::ForbiddenType:
      handleDelayedForbiddenType(*this, diag, decl);
      break;
    }
  }
} while ((pool = pool->getParent()));
7382}

7384/// Given a set of delayed diagnostics, re-emit them as if they had
7385/// been delayed in the current context instead of in the given pool.
7386/// Essentially, this just moves them to the current pool.
7387void Sema::redelayDiagnostics(DelayedDiagnosticPool &pool) {
DelayedDiagnosticPool *curPool = DelayedDiagnostics.getCurrentPool();
assert(curPool && "re-emitting in undelayed context not supported")(static_cast <bool> (curPool && "re-emitting in undelayed context not supported"
) ? void (0) : __assert_fail ("curPool && \"re-emitting in undelayed context not supported\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7389, __extension__ __PRETTY_FUNCTION__));
curPool->steal(pool);
7391}

7393static void EmitAvailabilityWarning(Sema &S, AvailabilityResult AR,
                                  const NamedDecl *ReferringDecl,
                                  const NamedDecl *OffendingDecl,
                                  StringRef Message, SourceLocation Loc,
                                  const ObjCInterfaceDecl *UnknownObjCClass,
                                  const ObjCPropertyDecl *ObjCProperty,
                                  bool ObjCPropertyAccess) {
// Delay if we're currently parsing a declaration.
if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
  S.DelayedDiagnostics.add(
      DelayedDiagnostic::makeAvailability(
          AR, Loc, ReferringDecl, OffendingDecl, UnknownObjCClass,
          ObjCProperty, Message, ObjCPropertyAccess));
  return;
}

Decl *Ctx = cast<Decl>(S.getCurLexicalContext());
DoEmitAvailabilityWarning(S, AR, Ctx, ReferringDecl, OffendingDecl,
                          Message, Loc, UnknownObjCClass, ObjCProperty,
                          ObjCPropertyAccess);
7413}

7415namespace {

7417/// Returns true if the given statement can be a body-like child of \p Parent.
7418bool isBodyLikeChildStmt(const Stmt *S, const Stmt *Parent) {
switch (Parent->getStmtClass()) {
case Stmt::IfStmtClass:
  return cast<IfStmt>(Parent)->getThen() == S ||
         cast<IfStmt>(Parent)->getElse() == S;
case Stmt::WhileStmtClass:
  return cast<WhileStmt>(Parent)->getBody() == S;
case Stmt::DoStmtClass:
  return cast<DoStmt>(Parent)->getBody() == S;
case Stmt::ForStmtClass:
  return cast<ForStmt>(Parent)->getBody() == S;
case Stmt::CXXForRangeStmtClass:
  return cast<CXXForRangeStmt>(Parent)->getBody() == S;
case Stmt::ObjCForCollectionStmtClass:
  return cast<ObjCForCollectionStmt>(Parent)->getBody() == S;
case Stmt::CaseStmtClass:
case Stmt::DefaultStmtClass:
  return cast<SwitchCase>(Parent)->getSubStmt() == S;
default:
  return false;
}
7439}

7441class StmtUSEFinder : public RecursiveASTVisitor<StmtUSEFinder> {
const Stmt *Target;

7444public:
bool VisitStmt(Stmt *S) { return S != Target; }

/// Returns true if the given statement is present in the given declaration.
static bool isContained(const Stmt *Target, const Decl *D) {
  StmtUSEFinder Visitor;
  Visitor.Target = Target;
  return !Visitor.TraverseDecl(const_cast<Decl *>(D));
}
7453};

7455/// Traverses the AST and finds the last statement that used a given
7456/// declaration.
7457class LastDeclUSEFinder : public RecursiveASTVisitor<LastDeclUSEFinder> {
const Decl *D;

7460public:
bool VisitDeclRefExpr(DeclRefExpr *DRE) {
  if (DRE->getDecl() == D)
    return false;
  return true;
}

static const Stmt *findLastStmtThatUsesDecl(const Decl *D,
                                            const CompoundStmt *Scope) {
  LastDeclUSEFinder Visitor;
  Visitor.D = D;
  for (auto I = Scope->body_rbegin(), E = Scope->body_rend(); I != E; ++I) {
    const Stmt *S = *I;
    if (!Visitor.TraverseStmt(const_cast<Stmt *>(S)))
      return S;
  }
  return nullptr;
}
7478};

7480/// \brief This class implements -Wunguarded-availability.
7481///
7482/// This is done with a traversal of the AST of a function that makes reference
7483/// to a partially available declaration. Whenever we encounter an \c if of the
7484/// form: \c if(@available(...)), we use the version from the condition to visit
7485/// the then statement.
7486class DiagnoseUnguardedAvailability
  : public RecursiveASTVisitor<DiagnoseUnguardedAvailability> {
typedef RecursiveASTVisitor<DiagnoseUnguardedAvailability> Base;

Sema &SemaRef;
Decl *Ctx;

/// Stack of potentially nested 'if (@available(...))'s.
SmallVector<VersionTuple, 8> AvailabilityStack;
SmallVector<const Stmt *, 16> StmtStack;

void DiagnoseDeclAvailability(NamedDecl *D, SourceRange Range);

7499public:
DiagnoseUnguardedAvailability(Sema &SemaRef, Decl *Ctx)
    : SemaRef(SemaRef), Ctx(Ctx) {
  AvailabilityStack.push_back(
      SemaRef.Context.getTargetInfo().getPlatformMinVersion());
}

bool TraverseDecl(Decl *D) {
  // Avoid visiting nested functions to prevent duplicate warnings.
  if (!D || isa<FunctionDecl>(D))
    return true;
  return Base::TraverseDecl(D);
}

bool TraverseStmt(Stmt *S) {
  if (!S)
    return true;
  StmtStack.push_back(S);
  bool Result = Base::TraverseStmt(S);
  StmtStack.pop_back();
  return Result;
}

void IssueDiagnostics(Stmt *S) { TraverseStmt(S); }

bool TraverseIfStmt(IfStmt *If);

bool TraverseLambdaExpr(LambdaExpr *E) { return true; }

// for 'case X:' statements, don't bother looking at the 'X'; it can't lead
// to any useful diagnostics.
bool TraverseCaseStmt(CaseStmt *CS) { return TraverseStmt(CS->getSubStmt()); }

bool VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *PRE) {
  if (PRE->isClassReceiver())
    DiagnoseDeclAvailability(PRE->getClassReceiver(), PRE->getReceiverLocation());
  return true;
}

bool VisitObjCMessageExpr(ObjCMessageExpr *Msg) {
  if (ObjCMethodDecl *D = Msg->getMethodDecl())
    DiagnoseDeclAvailability(
        D, SourceRange(Msg->getSelectorStartLoc(), Msg->getLocEnd()));
  return true;
}

bool VisitDeclRefExpr(DeclRefExpr *DRE) {
  DiagnoseDeclAvailability(DRE->getDecl(),
                           SourceRange(DRE->getLocStart(), DRE->getLocEnd()));
  return true;
}

bool VisitMemberExpr(MemberExpr *ME) {
  DiagnoseDeclAvailability(ME->getMemberDecl(),
                           SourceRange(ME->getLocStart(), ME->getLocEnd()));
  return true;
}

bool VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) {
  SemaRef.Diag(E->getLocStart(), diag::warn_at_available_unchecked_use)
      << (!SemaRef.getLangOpts().ObjC1);
  return true;
}

bool VisitTypeLoc(TypeLoc Ty);
7564};

7566void DiagnoseUnguardedAvailability::DiagnoseDeclAvailability(
  NamedDecl *D, SourceRange Range) {
AvailabilityResult Result;
const NamedDecl *OffendingDecl;
std::tie(Result, OffendingDecl) =
  ShouldDiagnoseAvailabilityOfDecl(D, nullptr);
if (Result != AR_Available) {
  // All other diagnostic kinds have already been handled in
  // DiagnoseAvailabilityOfDecl.
  if (Result != AR_NotYetIntroduced)
    return;

  const AvailabilityAttr *AA =
    getAttrForPlatform(SemaRef.getASTContext(), OffendingDecl);
  VersionTuple Introduced = AA->getIntroduced();

  if (AvailabilityStack.back() >= Introduced)
    return;

  // If the context of this function is less available than D, we should not
  // emit a diagnostic.
  if (!ShouldDiagnoseAvailabilityInContext(SemaRef, Result, Introduced, Ctx))
    return;

  // We would like to emit the diagnostic even if -Wunguarded-availability is
  // not specified for deployment targets >= to iOS 11 or equivalent or
  // for declarations that were introduced in iOS 11 (macOS 10.13, ...) or
  // later.
  unsigned DiagKind =
      shouldDiagnoseAvailabilityByDefault(
          SemaRef.Context,
          SemaRef.Context.getTargetInfo().getPlatformMinVersion(), Introduced)
          ? diag::warn_unguarded_availability_new
          : diag::warn_unguarded_availability;

  SemaRef.Diag(Range.getBegin(), DiagKind)
      << Range << D
      << AvailabilityAttr::getPrettyPlatformName(
             SemaRef.getASTContext().getTargetInfo().getPlatformName())
      << Introduced.getAsString();

  SemaRef.Diag(OffendingDecl->getLocation(),
               diag::note_availability_specified_here)
      << OffendingDecl << /* partial */ 3;

  auto FixitDiag =
      SemaRef.Diag(Range.getBegin(), diag::note_unguarded_available_silence)
      << Range << D
      << (SemaRef.getLangOpts().ObjC1 ? /*@available*/ 0
                                      : /*__builtin_available*/ 1);

  // Find the statement which should be enclosed in the if @available check.
  if (StmtStack.empty())
    return;
  const Stmt *StmtOfUse = StmtStack.back();
  const CompoundStmt *Scope = nullptr;
  for (const Stmt *S : llvm::reverse(StmtStack)) {
    if (const auto *CS = dyn_cast<CompoundStmt>(S)) {
      Scope = CS;
      break;
    }
    if (isBodyLikeChildStmt(StmtOfUse, S)) {
      // The declaration won't be seen outside of the statement, so we don't
      // have to wrap the uses of any declared variables in if (@available).
      // Therefore we can avoid setting Scope here.
      break;
    }
    StmtOfUse = S;
  }
  const Stmt *LastStmtOfUse = nullptr;
  if (isa<DeclStmt>(StmtOfUse) && Scope) {
    for (const Decl *D : cast<DeclStmt>(StmtOfUse)->decls()) {
      if (StmtUSEFinder::isContained(StmtStack.back(), D)) {
        LastStmtOfUse = LastDeclUSEFinder::findLastStmtThatUsesDecl(D, Scope);
        break;
      }
    }
  }

  const SourceManager &SM = SemaRef.getSourceManager();
  SourceLocation IfInsertionLoc =
      SM.getExpansionLoc(StmtOfUse->getLocStart());
  SourceLocation StmtEndLoc =
      SM.getExpansionRange(
            (LastStmtOfUse ? LastStmtOfUse : StmtOfUse)->getLocEnd())
          .second;
  if (SM.getFileID(IfInsertionLoc) != SM.getFileID(StmtEndLoc))
    return;

  StringRef Indentation = Lexer::getIndentationForLine(IfInsertionLoc, SM);
  const char *ExtraIndentation = "    ";
  std::string FixItString;
  llvm::raw_string_ostream FixItOS(FixItString);
  FixItOS << "if (" << (SemaRef.getLangOpts().ObjC1 ? "@available"
                                                    : "__builtin_available")
          << "("
          << AvailabilityAttr::getPlatformNameSourceSpelling(
                 SemaRef.getASTContext().getTargetInfo().getPlatformName())
          << " " << Introduced.getAsString() << ", *)) {\n"
          << Indentation << ExtraIndentation;
  FixitDiag << FixItHint::CreateInsertion(IfInsertionLoc, FixItOS.str());
  SourceLocation ElseInsertionLoc = Lexer::findLocationAfterToken(
      StmtEndLoc, tok::semi, SM, SemaRef.getLangOpts(),
      /*SkipTrailingWhitespaceAndNewLine=*/false);
  if (ElseInsertionLoc.isInvalid())
    ElseInsertionLoc =
        Lexer::getLocForEndOfToken(StmtEndLoc, 0, SM, SemaRef.getLangOpts());
  FixItOS.str().clear();
  FixItOS << "\n"
          << Indentation << "} else {\n"
          << Indentation << ExtraIndentation
          << "// Fallback on earlier versions\n"
          << Indentation << "}";
  FixitDiag << FixItHint::CreateInsertion(ElseInsertionLoc, FixItOS.str());
}
7681}

7683bool DiagnoseUnguardedAvailability::VisitTypeLoc(TypeLoc Ty) {
const Type *TyPtr = Ty.getTypePtr();
SourceRange Range{Ty.getBeginLoc(), Ty.getEndLoc()};

if (Range.isInvalid())
  return true;

if (const TagType *TT = dyn_cast<TagType>(TyPtr)) {
  TagDecl *TD = TT->getDecl();
  DiagnoseDeclAvailability(TD, Range);

} else if (const TypedefType *TD = dyn_cast<TypedefType>(TyPtr)) {
  TypedefNameDecl *D = TD->getDecl();
  DiagnoseDeclAvailability(D, Range);

} else if (const auto *ObjCO = dyn_cast<ObjCObjectType>(TyPtr)) {
  if (NamedDecl *D = ObjCO->getInterface())
    DiagnoseDeclAvailability(D, Range);
}

return true;
7704}

7706bool DiagnoseUnguardedAvailability::TraverseIfStmt(IfStmt *If) {
VersionTuple CondVersion;
if (auto *E = dyn_cast<ObjCAvailabilityCheckExpr>(If->getCond())) {
  CondVersion = E->getVersion();

  // If we're using the '*' case here or if this check is redundant, then we
  // use the enclosing version to check both branches.
  if (CondVersion.empty() || CondVersion <= AvailabilityStack.back())
    return TraverseStmt(If->getThen()) && TraverseStmt(If->getElse());
} else {
  // This isn't an availability checking 'if', we can just continue.
  return Base::TraverseIfStmt(If);
}

AvailabilityStack.push_back(CondVersion);
bool ShouldContinue = TraverseStmt(If->getThen());
AvailabilityStack.pop_back();

return ShouldContinue && TraverseStmt(If->getElse());
7725}

7727} // end anonymous namespace

7729void Sema::DiagnoseUnguardedAvailabilityViolations(Decl *D) {
Stmt *Body = nullptr;

if (auto *FD = D->getAsFunction()) {
  // FIXME: We only examine the pattern decl for availability violations now,
  // but we should also examine instantiated templates.
  if (FD->isTemplateInstantiation())
    return;

  Body = FD->getBody();
} else if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
  Body = MD->getBody();
else if (auto *BD = dyn_cast<BlockDecl>(D))
  Body = BD->getBody();

assert(Body && "Need a body here!")(static_cast <bool> (Body && "Need a body here!"
) ? void (0) : __assert_fail ("Body && \"Need a body here!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/lib/Sema/SemaDeclAttr.cpp"
, 7744, __extension__ __PRETTY_FUNCTION__));

DiagnoseUnguardedAvailability(*this, D).IssueDiagnostics(Body);
7747}

7749void Sema::DiagnoseAvailabilityOfDecl(NamedDecl *D, SourceLocation Loc,
                                    const ObjCInterfaceDecl *UnknownObjCClass,
                                    bool ObjCPropertyAccess,
                                    bool AvoidPartialAvailabilityChecks) {
std::string Message;
AvailabilityResult Result;
const NamedDecl* OffendingDecl;
// See if this declaration is unavailable, deprecated, or partial.
std::tie(Result, OffendingDecl) = ShouldDiagnoseAvailabilityOfDecl(D, &Message);
if (Result == AR_Available)
  return;

if (Result == AR_NotYetIntroduced) {
  if (AvoidPartialAvailabilityChecks)
    return;

  // We need to know the @available context in the current function to
  // diagnose this use, let DiagnoseUnguardedAvailabilityViolations do that
  // when we're done parsing the current function.
  if (getCurFunctionOrMethodDecl()) {
    getEnclosingFunction()->HasPotentialAvailabilityViolations = true;
    return;
  } else if (getCurBlock() || getCurLambda()) {
    getCurFunction()->HasPotentialAvailabilityViolations = true;
    return;
  }
}

const ObjCPropertyDecl *ObjCPDecl = nullptr;
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
  if (const ObjCPropertyDecl *PD = MD->findPropertyDecl()) {
    AvailabilityResult PDeclResult = PD->getAvailability(nullptr);
    if (PDeclResult == Result)
      ObjCPDecl = PD;
  }
}

EmitAvailabilityWarning(*this, Result, D, OffendingDecl, Message, Loc,
                        UnknownObjCClass, ObjCPDecl, ObjCPropertyAccess);
7788}

←

/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h

→

1//===--- Sema.h - Semantic Analysis & AST Building --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the Sema class, which performs semantic analysis and
11// builds ASTs.
12//
13//===----------------------------------------------------------------------===//

15#ifndef LLVM_CLANG_SEMA_SEMA_H
16#define LLVM_CLANG_SEMA_SEMA_H

18#include "clang/AST/Attr.h"
19#include "clang/AST/Availability.h"
20#include "clang/AST/DeclarationName.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/Expr.h"
23#include "clang/AST/ExprObjC.h"
24#include "clang/AST/ExternalASTSource.h"
25#include "clang/AST/LocInfoType.h"
26#include "clang/AST/MangleNumberingContext.h"
27#include "clang/AST/NSAPI.h"
28#include "clang/AST/PrettyPrinter.h"
29#include "clang/AST/StmtCXX.h"
30#include "clang/AST/TypeLoc.h"
31#include "clang/AST/TypeOrdering.h"
32#include "clang/Basic/ExpressionTraits.h"
33#include "clang/Basic/LangOptions.h"
34#include "clang/Basic/Module.h"
35#include "clang/Basic/OpenMPKinds.h"
36#include "clang/Basic/PragmaKinds.h"
37#include "clang/Basic/Specifiers.h"
38#include "clang/Basic/TemplateKinds.h"
39#include "clang/Basic/TypeTraits.h"
40#include "clang/Sema/AnalysisBasedWarnings.h"
41#include "clang/Sema/CleanupInfo.h"
42#include "clang/Sema/DeclSpec.h"
43#include "clang/Sema/ExternalSemaSource.h"
44#include "clang/Sema/IdentifierResolver.h"
45#include "clang/Sema/ObjCMethodList.h"
46#include "clang/Sema/Ownership.h"
47#include "clang/Sema/Scope.h"
48#include "clang/Sema/ScopeInfo.h"
49#include "clang/Sema/TypoCorrection.h"
50#include "clang/Sema/Weak.h"
51#include "llvm/ADT/ArrayRef.h"
52#include "llvm/ADT/Optional.h"
53#include "llvm/ADT/SetVector.h"
54#include "llvm/ADT/SmallPtrSet.h"
55#include "llvm/ADT/SmallVector.h"
56#include "llvm/ADT/TinyPtrVector.h"
57#include <deque>
58#include <memory>
59#include <string>
60#include <vector>

62namespace llvm {
class APSInt;
template <typename ValueT> struct DenseMapInfo;
template <typename ValueT, typename ValueInfoT> class DenseSet;
class SmallBitVector;
struct InlineAsmIdentifierInfo;
68}

70namespace clang {
class ADLResult;
class ASTConsumer;
class ASTContext;
class ASTMutationListener;
class ASTReader;
class ASTWriter;
class ArrayType;
class AttributeList;
class BindingDecl;
class BlockDecl;
class CapturedDecl;
class CXXBasePath;
class CXXBasePaths;
class CXXBindTemporaryExpr;
typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
class CXXConstructorDecl;
class CXXConversionDecl;
class CXXDeleteExpr;
class CXXDestructorDecl;
class CXXFieldCollector;
class CXXMemberCallExpr;
class CXXMethodDecl;
class CXXScopeSpec;
class CXXTemporary;
class CXXTryStmt;
class CallExpr;
class ClassTemplateDecl;
class ClassTemplatePartialSpecializationDecl;
class ClassTemplateSpecializationDecl;
class VarTemplatePartialSpecializationDecl;
class CodeCompleteConsumer;
class CodeCompletionAllocator;
class CodeCompletionTUInfo;
class CodeCompletionResult;
class CoroutineBodyStmt;
class Decl;
class DeclAccessPair;
class DeclContext;
class DeclRefExpr;
class DeclaratorDecl;
class DeducedTemplateArgument;
class DependentDiagnostic;
class DesignatedInitExpr;
class Designation;
class EnableIfAttr;
class EnumConstantDecl;
class Expr;
class ExtVectorType;
class FormatAttr;
class FriendDecl;
class FunctionDecl;
class FunctionProtoType;
class FunctionTemplateDecl;
class ImplicitConversionSequence;
typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
class InitListExpr;
class InitializationKind;
class InitializationSequence;
class InitializedEntity;
class IntegerLiteral;
class LabelStmt;
class LambdaExpr;
class LangOptions;
class LocalInstantiationScope;
class LookupResult;
class MacroInfo;
typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
class ModuleLoader;
class MultiLevelTemplateArgumentList;
class NamedDecl;
class ObjCCategoryDecl;
class ObjCCategoryImplDecl;
class ObjCCompatibleAliasDecl;
class ObjCContainerDecl;
class ObjCImplDecl;
class ObjCImplementationDecl;
class ObjCInterfaceDecl;
class ObjCIvarDecl;
template <class T> class ObjCList;
class ObjCMessageExpr;
class ObjCMethodDecl;
class ObjCPropertyDecl;
class ObjCProtocolDecl;
class OMPThreadPrivateDecl;
class OMPDeclareReductionDecl;
class OMPDeclareSimdDecl;
class OMPClause;
struct OverloadCandidate;
class OverloadCandidateSet;
class OverloadExpr;
class ParenListExpr;
class ParmVarDecl;
class Preprocessor;
class PseudoDestructorTypeStorage;
class PseudoObjectExpr;
class QualType;
class StandardConversionSequence;
class Stmt;
class StringLiteral;
class SwitchStmt;
class TemplateArgument;
class TemplateArgumentList;
class TemplateArgumentLoc;
class TemplateDecl;
class TemplateInstantiationCallback;
class TemplateParameterList;
class TemplatePartialOrderingContext;
class TemplateTemplateParmDecl;
class Token;
class TypeAliasDecl;
class TypedefDecl;
class TypedefNameDecl;
class TypeLoc;
class TypoCorrectionConsumer;
class UnqualifiedId;
class UnresolvedLookupExpr;
class UnresolvedMemberExpr;
class UnresolvedSetImpl;
class UnresolvedSetIterator;
class UsingDecl;
class UsingShadowDecl;
class ValueDecl;
class VarDecl;
class VarTemplateSpecializationDecl;
class VisibilityAttr;
class VisibleDeclConsumer;
class IndirectFieldDecl;
struct DeductionFailureInfo;
class TemplateSpecCandidateSet;

201namespace sema {
class AccessedEntity;
class BlockScopeInfo;
class CapturedRegionScopeInfo;
class CapturingScopeInfo;
class CompoundScopeInfo;
class DelayedDiagnostic;
class DelayedDiagnosticPool;
class FunctionScopeInfo;
class LambdaScopeInfo;
class PossiblyUnreachableDiag;
class SemaPPCallbacks;
class TemplateDeductionInfo;
214}

216namespace threadSafety {
class BeforeSet;
void threadSafetyCleanup(BeforeSet* Cache);
219}

221// FIXME: No way to easily map from TemplateTypeParmTypes to
222// TemplateTypeParmDecls, so we have this horrible PointerUnion.
223typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
                SourceLocation> UnexpandedParameterPack;

226/// Describes whether we've seen any nullability information for the given
227/// file.
228struct FileNullability {
/// The first pointer declarator (of any pointer kind) in the file that does
/// not have a corresponding nullability annotation.
SourceLocation PointerLoc;

/// The end location for the first pointer declarator in the file. Used for
/// placing fix-its.
SourceLocation PointerEndLoc;

/// Which kind of pointer declarator we saw.
uint8_t PointerKind;

/// Whether we saw any type nullability annotations in the given file.
bool SawTypeNullability = false;
242};

244/// A mapping from file IDs to a record of whether we've seen nullability
245/// information in that file.
246class FileNullabilityMap {
/// A mapping from file IDs to the nullability information for each file ID.
llvm::DenseMap<FileID, FileNullability> Map;

/// A single-element cache based on the file ID.
struct {
  FileID File;
  FileNullability Nullability;
} Cache;

256public:
FileNullability &operator[](FileID file) {
  // Check the single-element cache.
  if (file == Cache.File)
    return Cache.Nullability;

  // It's not in the single-element cache; flush the cache if we have one.
  if (!Cache.File.isInvalid()) {
    Map[Cache.File] = Cache.Nullability;
  }

  // Pull this entry into the cache.
  Cache.File = file;
  Cache.Nullability = Map[file];
  return Cache.Nullability;
}
272};

274/// Sema - This implements semantic analysis and AST building for C.
275class Sema {
Sema(const Sema &) = delete;
void operator=(const Sema &) = delete;

///\brief Source of additional semantic information.
ExternalSemaSource *ExternalSource;

///\brief Whether Sema has generated a multiplexer and has to delete it.
bool isMultiplexExternalSource;

static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);

bool isVisibleSlow(const NamedDecl *D);

/// Determine whether two declarations should be linked together, given that
/// the old declaration might not be visible and the new declaration might
/// not have external linkage.
bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
                                  const NamedDecl *New) {
  if (isVisible(Old))
   return true;
  // See comment in below overload for why it's safe to compute the linkage
  // of the new declaration here.
  if (New->isExternallyDeclarable()) {
    assert(Old->isExternallyDeclarable() &&(static_cast <bool> (Old->isExternallyDeclarable() &&
 "should not have found a non-externally-declarable previous decl"
) ? void (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 300, __extension__ __PRETTY_FUNCTION__))
           "should not have found a non-externally-declarable previous decl")(static_cast <bool> (Old->isExternallyDeclarable() &&
 "should not have found a non-externally-declarable previous decl"
) ? void (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 300, __extension__ __PRETTY_FUNCTION__));
    return true;
  }
  return false;
}
bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);

307public:
typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
typedef OpaquePtr<TemplateName> TemplateTy;
typedef OpaquePtr<QualType> TypeTy;

OpenCLOptions OpenCLFeatures;
FPOptions FPFeatures;

const LangOptions &LangOpts;
Preprocessor &PP;
ASTContext &Context;
ASTConsumer &Consumer;
DiagnosticsEngine &Diags;
SourceManager &SourceMgr;

/// \brief Flag indicating whether or not to collect detailed statistics.
bool CollectStats;

/// \brief Code-completion consumer.
CodeCompleteConsumer *CodeCompleter;

/// CurContext - This is the current declaration context of parsing.
DeclContext *CurContext;

/// \brief Generally null except when we temporarily switch decl contexts,
/// like in \see ActOnObjCTemporaryExitContainerContext.
DeclContext *OriginalLexicalContext;

/// VAListTagName - The declaration name corresponding to __va_list_tag.
/// This is used as part of a hack to omit that class from ADL results.
DeclarationName VAListTagName;

bool MSStructPragmaOn; // True when \#pragma ms_struct on

/// \brief Controls member pointer representation format under the MS ABI.
LangOptions::PragmaMSPointersToMembersKind
    MSPointerToMemberRepresentationMethod;

/// Stack of active SEH __finally scopes.  Can be empty.
SmallVector<Scope*, 2> CurrentSEHFinally;

/// \brief Source location for newly created implicit MSInheritanceAttrs
SourceLocation ImplicitMSInheritanceAttrLoc;

/// \brief pragma clang section kind
enum PragmaClangSectionKind {
  PCSK_Invalid      = 0,
  PCSK_BSS          = 1,
  PCSK_Data         = 2,
  PCSK_Rodata       = 3,
  PCSK_Text         = 4
 };

enum PragmaClangSectionAction {
  PCSA_Set     = 0,
  PCSA_Clear   = 1
};

struct PragmaClangSection {
  std::string SectionName;
  bool Valid = false;
  SourceLocation PragmaLocation;

  void Act(SourceLocation PragmaLocation,
           PragmaClangSectionAction Action,
           StringLiteral* Name);
 };

 PragmaClangSection PragmaClangBSSSection;
 PragmaClangSection PragmaClangDataSection;
 PragmaClangSection PragmaClangRodataSection;
 PragmaClangSection PragmaClangTextSection;

enum PragmaMsStackAction {
  PSK_Reset     = 0x0,                // #pragma ()
  PSK_Set       = 0x1,                // #pragma (value)
  PSK_Push      = 0x2,                // #pragma (push[, id])
  PSK_Pop       = 0x4,                // #pragma (pop[, id])
  PSK_Show      = 0x8,                // #pragma (show) -- only for "pack"!
  PSK_Push_Set  = PSK_Push | PSK_Set, // #pragma (push[, id], value)
  PSK_Pop_Set   = PSK_Pop | PSK_Set,  // #pragma (pop[, id], value)
};

template<typename ValueType>
struct PragmaStack {
  struct Slot {
    llvm::StringRef StackSlotLabel;
    ValueType Value;
    SourceLocation PragmaLocation;
    SourceLocation PragmaPushLocation;
    Slot(llvm::StringRef StackSlotLabel, ValueType Value,
         SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
        : StackSlotLabel(StackSlotLabel), Value(Value),
          PragmaLocation(PragmaLocation),
          PragmaPushLocation(PragmaPushLocation) {}
  };
  void Act(SourceLocation PragmaLocation,
           PragmaMsStackAction Action,
           llvm::StringRef StackSlotLabel,
           ValueType Value);

  // MSVC seems to add artificial slots to #pragma stacks on entering a C++
  // method body to restore the stacks on exit, so it works like this:
  //
  //   struct S {
  //     #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
  //     void Method {}
  //     #pragma <name>(pop, InternalPragmaSlot)
  //   };
  //
  // It works even with #pragma vtordisp, although MSVC doesn't support
  //   #pragma vtordisp(push [, id], n)
  // syntax.
  //
  // Push / pop a named sentinel slot.
  void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
    assert((Action == PSK_Push || Action == PSK_Pop) &&(static_cast <bool> ((Action == PSK_Push || Action == PSK_Pop
) && "Can only push / pop #pragma stack sentinels!") ?
 void (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 424, __extension__ __PRETTY_FUNCTION__))
           "Can only push / pop #pragma stack sentinels!")(static_cast <bool> ((Action == PSK_Push || Action == PSK_Pop
) && "Can only push / pop #pragma stack sentinels!") ?
 void (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 424, __extension__ __PRETTY_FUNCTION__));
    Act(CurrentPragmaLocation, Action, Label, CurrentValue);
  }

  // Constructors.
  explicit PragmaStack(const ValueType &Default)
      : DefaultValue(Default), CurrentValue(Default) {}

  bool hasValue() const { return CurrentValue != DefaultValue; }

  SmallVector<Slot, 2> Stack;
  ValueType DefaultValue; // Value used for PSK_Reset action.
  ValueType CurrentValue;
  SourceLocation CurrentPragmaLocation;
};
// FIXME: We should serialize / deserialize these if they occur in a PCH (but
// we shouldn't do so if they're in a module).

/// \brief Whether to insert vtordisps prior to virtual bases in the Microsoft
/// C++ ABI.  Possible values are 0, 1, and 2, which mean:
///
/// 0: Suppress all vtordisps
/// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
///    structors
/// 2: Always insert vtordisps to support RTTI on partially constructed
///    objects
PragmaStack<MSVtorDispAttr::Mode> VtorDispStack;
// #pragma pack.
// Sentinel to represent when the stack is set to mac68k alignment.
static const unsigned kMac68kAlignmentSentinel = ~0U;
PragmaStack<unsigned> PackStack;
// The current #pragma pack values and locations at each #include.
struct PackIncludeState {
  unsigned CurrentValue;
  SourceLocation CurrentPragmaLocation;
  bool HasNonDefaultValue, ShouldWarnOnInclude;
};
SmallVector<PackIncludeState, 8> PackIncludeStack;
// Segment #pragmas.
PragmaStack<StringLiteral *> DataSegStack;
PragmaStack<StringLiteral *> BSSSegStack;
PragmaStack<StringLiteral *> ConstSegStack;
PragmaStack<StringLiteral *> CodeSegStack;

// RAII object to push / pop sentinel slots for all MS #pragma stacks.
// Actions should be performed only if we enter / exit a C++ method body.
class PragmaStackSentinelRAII {
public:
  PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
  ~PragmaStackSentinelRAII();

private:
  Sema &S;
  StringRef SlotLabel;
  bool ShouldAct;
};

/// A mapping that describes the nullability we've seen in each header file.
FileNullabilityMap NullabilityMap;

/// Last section used with #pragma init_seg.
StringLiteral *CurInitSeg;
SourceLocation CurInitSegLoc;

/// VisContext - Manages the stack for \#pragma GCC visibility.
void *VisContext; // Really a "PragmaVisStack*"

/// \brief This represents the stack of attributes that were pushed by
/// \#pragma clang attribute.
struct PragmaAttributeEntry {
  SourceLocation Loc;
  AttributeList *Attribute;
  SmallVector<attr::SubjectMatchRule, 4> MatchRules;
  bool IsUsed;
};
SmallVector<PragmaAttributeEntry, 2> PragmaAttributeStack;

/// \brief The declaration that is currently receiving an attribute from the
/// #pragma attribute stack.
const Decl *PragmaAttributeCurrentTargetDecl;

/// \brief This represents the last location of a "#pragma clang optimize off"
/// directive if such a directive has not been closed by an "on" yet. If
/// optimizations are currently "on", this is set to an invalid location.
SourceLocation OptimizeOffPragmaLocation;

/// \brief Flag indicating if Sema is building a recovery call expression.
///
/// This flag is used to avoid building recovery call expressions
/// if Sema is already doing so, which would cause infinite recursions.
bool IsBuildingRecoveryCallExpr;

/// Used to control the generation of ExprWithCleanups.
CleanupInfo Cleanup;

/// ExprCleanupObjects - This is the stack of objects requiring
/// cleanup that are created by the current full expression.  The
/// element type here is ExprWithCleanups::Object.
SmallVector<BlockDecl*, 8> ExprCleanupObjects;

/// \brief Store a list of either DeclRefExprs or MemberExprs
///  that contain a reference to a variable (constant) that may or may not
///  be odr-used in this Expr, and we won't know until all lvalue-to-rvalue
///  and discarded value conversions have been applied to all subexpressions
///  of the enclosing full expression.  This is cleared at the end of each
///  full expression.
llvm::SmallPtrSet<Expr*, 2> MaybeODRUseExprs;

/// \brief Stack containing information about each of the nested
/// function, block, and method scopes that are currently active.
///
/// This array is never empty.  Clients should ignore the first
/// element, which is used to cache a single FunctionScopeInfo
/// that's used to parse every top-level function.
SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;

typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
  ExtVectorDeclsType;

/// ExtVectorDecls - This is a list all the extended vector types. This allows
/// us to associate a raw vector type with one of the ext_vector type names.
/// This is only necessary for issuing pretty diagnostics.
ExtVectorDeclsType ExtVectorDecls;

/// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
std::unique_ptr<CXXFieldCollector> FieldCollector;

typedef llvm::SmallSetVector<const NamedDecl*, 16> NamedDeclSetType;

/// \brief Set containing all declared private fields that are not used.
NamedDeclSetType UnusedPrivateFields;

/// \brief Set containing all typedefs that are likely unused.
llvm::SmallSetVector<const TypedefNameDecl *, 4>
    UnusedLocalTypedefNameCandidates;

/// \brief Delete-expressions to be analyzed at the end of translation unit
///
/// This list contains class members, and locations of delete-expressions
/// that could not be proven as to whether they mismatch with new-expression
/// used in initializer of the field.
typedef std::pair<SourceLocation, bool> DeleteExprLoc;
typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;

typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;

/// PureVirtualClassDiagSet - a set of class declarations which we have
/// emitted a list of pure virtual functions. Used to prevent emitting the
/// same list more than once.
std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;

/// ParsingInitForAutoVars - a set of declarations with auto types for which
/// we are currently parsing the initializer.
llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;

/// \brief Look for a locally scoped extern "C" declaration by the given name.
NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);

typedef LazyVector<VarDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
  TentativeDefinitionsType;

/// \brief All the tentative definitions encountered in the TU.
TentativeDefinitionsType TentativeDefinitions;

typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
  UnusedFileScopedDeclsType;

/// \brief The set of file scoped decls seen so far that have not been used
/// and must warn if not used. Only contains the first declaration.
UnusedFileScopedDeclsType UnusedFileScopedDecls;

typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
  DelegatingCtorDeclsType;

/// \brief All the delegating constructors seen so far in the file, used for
/// cycle detection at the end of the TU.
DelegatingCtorDeclsType DelegatingCtorDecls;

/// \brief All the overriding functions seen during a class definition
/// that had their exception spec checks delayed, plus the overridden
/// function.
SmallVector<std::pair<const CXXMethodDecl*, const CXXMethodDecl*>, 2>
  DelayedExceptionSpecChecks;

/// \brief All the members seen during a class definition which were both
/// explicitly defaulted and had explicitly-specified exception
/// specifications, along with the function type containing their
/// user-specified exception specification. Those exception specifications
/// were overridden with the default specifications, but we still need to
/// check whether they are compatible with the default specification, and
/// we can't do that until the nesting set of class definitions is complete.
SmallVector<std::pair<CXXMethodDecl*, const FunctionProtoType*>, 2>
  DelayedDefaultedMemberExceptionSpecs;

typedef llvm::MapVector<const FunctionDecl *,
                        std::unique_ptr<LateParsedTemplate>>
    LateParsedTemplateMapT;
LateParsedTemplateMapT LateParsedTemplateMap;

/// \brief Callback to the parser to parse templated functions when needed.
typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
typedef void LateTemplateParserCleanupCB(void *P);
LateTemplateParserCB *LateTemplateParser;
LateTemplateParserCleanupCB *LateTemplateParserCleanup;
void *OpaqueParser;

void SetLateTemplateParser(LateTemplateParserCB *LTP,
                           LateTemplateParserCleanupCB *LTPCleanup,
                           void *P) {
  LateTemplateParser = LTP;
  LateTemplateParserCleanup = LTPCleanup;
  OpaqueParser = P;
}

class DelayedDiagnostics;

class DelayedDiagnosticsState {
  sema::DelayedDiagnosticPool *SavedPool;
  friend class Sema::DelayedDiagnostics;
};
typedef DelayedDiagnosticsState ParsingDeclState;
typedef DelayedDiagnosticsState ProcessingContextState;

/// A class which encapsulates the logic for delaying diagnostics
/// during parsing and other processing.
class DelayedDiagnostics {
  /// \brief The current pool of diagnostics into which delayed
  /// diagnostics should go.
  sema::DelayedDiagnosticPool *CurPool;

public:
  DelayedDiagnostics() : CurPool(nullptr) {}

  /// Adds a delayed diagnostic.
  void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h

  /// Determines whether diagnostics should be delayed.
  bool shouldDelayDiagnostics() { return CurPool != nullptr; }

  /// Returns the current delayed-diagnostics pool.
  sema::DelayedDiagnosticPool *getCurrentPool() const {
    return CurPool;
  }

  /// Enter a new scope.  Access and deprecation diagnostics will be
  /// collected in this pool.
  DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = &pool;
    return state;
  }

  /// Leave a delayed-diagnostic state that was previously pushed.
  /// Do not emit any of the diagnostics.  This is performed as part
  /// of the bookkeeping of popping a pool "properly".
  void popWithoutEmitting(DelayedDiagnosticsState state) {
    CurPool = state.SavedPool;
  }

  /// Enter a new scope where access and deprecation diagnostics are
  /// not delayed.
  DelayedDiagnosticsState pushUndelayed() {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = nullptr;
    return state;
  }

  /// Undo a previous pushUndelayed().
  void popUndelayed(DelayedDiagnosticsState state) {
    assert(CurPool == nullptr)(static_cast <bool> (CurPool == nullptr) ? void (0) : __assert_fail
 ("CurPool == nullptr", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 700, __extension__ __PRETTY_FUNCTION__));
    CurPool = state.SavedPool;
  }
} DelayedDiagnostics;

/// A RAII object to temporarily push a declaration context.
class ContextRAII {
private:
  Sema &S;
  DeclContext *SavedContext;
  ProcessingContextState SavedContextState;
  QualType SavedCXXThisTypeOverride;

public:
  ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
    : S(S), SavedContext(S.CurContext),
      SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
      SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
  {
    assert(ContextToPush && "pushing null context")(static_cast <bool> (ContextToPush && "pushing null context"
) ? void (0) : __assert_fail ("ContextToPush && \"pushing null context\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 719, __extension__ __PRETTY_FUNCTION__));
    S.CurContext = ContextToPush;
    if (NewThisContext)
      S.CXXThisTypeOverride = QualType();
  }

  void pop() {
    if (!SavedContext) return;
    S.CurContext = SavedContext;
    S.DelayedDiagnostics.popUndelayed(SavedContextState);
    S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
    SavedContext = nullptr;
  }

  ~ContextRAII() {
    pop();
  }
};

/// \brief RAII object to handle the state changes required to synthesize
/// a function body.
class SynthesizedFunctionScope {
  Sema &S;
  Sema::ContextRAII SavedContext;
  bool PushedCodeSynthesisContext = false;

public:
  SynthesizedFunctionScope(Sema &S, DeclContext *DC)
      : S(S), SavedContext(S, DC) {
    S.PushFunctionScope();
    S.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
    if (auto *FD = dyn_cast<FunctionDecl>(DC))
      FD->setWillHaveBody(true);
    else
      assert(isa<ObjCMethodDecl>(DC))(static_cast <bool> (isa<ObjCMethodDecl>(DC)) ? void
 (0) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 754, __extension__ __PRETTY_FUNCTION__));
  }

  void addContextNote(SourceLocation UseLoc) {
    assert(!PushedCodeSynthesisContext)(static_cast <bool> (!PushedCodeSynthesisContext) ? void
 (0) : __assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 758, __extension__ __PRETTY_FUNCTION__));

    Sema::CodeSynthesisContext Ctx;
    Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
    Ctx.PointOfInstantiation = UseLoc;
    Ctx.Entity = cast<Decl>(S.CurContext);
    S.pushCodeSynthesisContext(Ctx);

    PushedCodeSynthesisContext = true;
  }

  ~SynthesizedFunctionScope() {
    if (PushedCodeSynthesisContext)
      S.popCodeSynthesisContext();
    if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
      FD->setWillHaveBody(false);
    S.PopExpressionEvaluationContext();
    S.PopFunctionScopeInfo();
  }
};

/// WeakUndeclaredIdentifiers - Identifiers contained in
/// \#pragma weak before declared. rare. may alias another
/// identifier, declared or undeclared
llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;

/// ExtnameUndeclaredIdentifiers - Identifiers contained in
/// \#pragma redefine_extname before declared.  Used in Solaris system headers
/// to define functions that occur in multiple standards to call the version
/// in the currently selected standard.
llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;


/// \brief Load weak undeclared identifiers from the external source.
void LoadExternalWeakUndeclaredIdentifiers();

/// WeakTopLevelDecl - Translation-unit scoped declarations generated by
/// \#pragma weak during processing of other Decls.
/// I couldn't figure out a clean way to generate these in-line, so
/// we store them here and handle separately -- which is a hack.
/// It would be best to refactor this.
SmallVector<Decl*,2> WeakTopLevelDecl;

IdentifierResolver IdResolver;

/// Translation Unit Scope - useful to Objective-C actions that need
/// to lookup file scope declarations in the "ordinary" C decl namespace.
/// For example, user-defined classes, built-in "id" type, etc.
Scope *TUScope;

/// \brief The C++ "std" namespace, where the standard library resides.
LazyDeclPtr StdNamespace;

/// \brief The C++ "std::bad_alloc" class, which is defined by the C++
/// standard library.
LazyDeclPtr StdBadAlloc;

/// \brief The C++ "std::align_val_t" enum class, which is defined by the C++
/// standard library.
LazyDeclPtr StdAlignValT;

/// \brief The C++ "std::experimental" namespace, where the experimental parts
/// of the standard library resides.
NamespaceDecl *StdExperimentalNamespaceCache;

/// \brief The C++ "std::initializer_list" template, which is defined in
/// \<initializer_list>.
ClassTemplateDecl *StdInitializerList;

/// \brief The C++ "type_info" declaration, which is defined in \<typeinfo>.
RecordDecl *CXXTypeInfoDecl;

/// \brief The MSVC "_GUID" struct, which is defined in MSVC header files.
RecordDecl *MSVCGuidDecl;

/// \brief Caches identifiers/selectors for NSFoundation APIs.
std::unique_ptr<NSAPI> NSAPIObj;

/// \brief The declaration of the Objective-C NSNumber class.
ObjCInterfaceDecl *NSNumberDecl;

/// \brief The declaration of the Objective-C NSValue class.
ObjCInterfaceDecl *NSValueDecl;

/// \brief Pointer to NSNumber type (NSNumber *).
QualType NSNumberPointer;

/// \brief Pointer to NSValue type (NSValue *).
QualType NSValuePointer;

/// \brief The Objective-C NSNumber methods used to create NSNumber literals.
ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];

/// \brief The declaration of the Objective-C NSString class.
ObjCInterfaceDecl *NSStringDecl;

/// \brief Pointer to NSString type (NSString *).
QualType NSStringPointer;

/// \brief The declaration of the stringWithUTF8String: method.
ObjCMethodDecl *StringWithUTF8StringMethod;

/// \brief The declaration of the valueWithBytes:objCType: method.
ObjCMethodDecl *ValueWithBytesObjCTypeMethod;

/// \brief The declaration of the Objective-C NSArray class.
ObjCInterfaceDecl *NSArrayDecl;

/// \brief The declaration of the arrayWithObjects:count: method.
ObjCMethodDecl *ArrayWithObjectsMethod;

/// \brief The declaration of the Objective-C NSDictionary class.
ObjCInterfaceDecl *NSDictionaryDecl;

/// \brief The declaration of the dictionaryWithObjects:forKeys:count: method.
ObjCMethodDecl *DictionaryWithObjectsMethod;

/// \brief id<NSCopying> type.
QualType QIDNSCopying;

/// \brief will hold 'respondsToSelector:'
Selector RespondsToSelectorSel;

/// A flag to remember whether the implicit forms of operator new and delete
/// have been declared.
bool GlobalNewDeleteDeclared;

/// A flag to indicate that we're in a context that permits abstract
/// references to fields.  This is really a
bool AllowAbstractFieldReference;

/// \brief Describes how the expressions currently being parsed are
/// evaluated at run-time, if at all.
enum class ExpressionEvaluationContext {
  /// \brief The current expression and its subexpressions occur within an
  /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
  /// \c sizeof, where the type of the expression may be significant but
  /// no code will be generated to evaluate the value of the expression at
  /// run time.
  Unevaluated,

  /// \brief The current expression occurs within a braced-init-list within
  /// an unevaluated operand. This is mostly like a regular unevaluated
  /// context, except that we still instantiate constexpr functions that are
  /// referenced here so that we can perform narrowing checks correctly.
  UnevaluatedList,

  /// \brief The current expression occurs within a discarded statement.
  /// This behaves largely similarly to an unevaluated operand in preventing
  /// definitions from being required, but not in other ways.
  DiscardedStatement,

  /// \brief The current expression occurs within an unevaluated
  /// operand that unconditionally permits abstract references to
  /// fields, such as a SIZE operator in MS-style inline assembly.
  UnevaluatedAbstract,

  /// \brief The current context is "potentially evaluated" in C++11 terms,
  /// but the expression is evaluated at compile-time (like the values of
  /// cases in a switch statement).
  ConstantEvaluated,

  /// \brief The current expression is potentially evaluated at run time,
  /// which means that code may be generated to evaluate the value of the
  /// expression at run time.
  PotentiallyEvaluated,

  /// \brief The current expression is potentially evaluated, but any
  /// declarations referenced inside that expression are only used if
  /// in fact the current expression is used.
  ///
  /// This value is used when parsing default function arguments, for which
  /// we would like to provide diagnostics (e.g., passing non-POD arguments
  /// through varargs) but do not want to mark declarations as "referenced"
  /// until the default argument is used.
  PotentiallyEvaluatedIfUsed
};

/// \brief Data structure used to record current or nested
/// expression evaluation contexts.
struct ExpressionEvaluationContextRecord {
  /// \brief The expression evaluation context.
  ExpressionEvaluationContext Context;

  /// \brief Whether the enclosing context needed a cleanup.
  CleanupInfo ParentCleanup;

  /// \brief Whether we are in a decltype expression.
  bool IsDecltype;

  /// \brief The number of active cleanup objects when we entered
  /// this expression evaluation context.
  unsigned NumCleanupObjects;

  /// \brief The number of typos encountered during this expression evaluation
  /// context (i.e. the number of TypoExprs created).
  unsigned NumTypos;

  llvm::SmallPtrSet<Expr*, 2> SavedMaybeODRUseExprs;

  /// \brief The lambdas that are present within this context, if it
  /// is indeed an unevaluated context.
  SmallVector<LambdaExpr *, 2> Lambdas;

  /// \brief The declaration that provides context for lambda expressions
  /// and block literals if the normal declaration context does not
  /// suffice, e.g., in a default function argument.
  Decl *ManglingContextDecl;

  /// \brief The context information used to mangle lambda expressions
  /// and block literals within this context.
  ///
  /// This mangling information is allocated lazily, since most contexts
  /// do not have lambda expressions or block literals.
  std::unique_ptr<MangleNumberingContext> MangleNumbering;

  /// \brief If we are processing a decltype type, a set of call expressions
  /// for which we have deferred checking the completeness of the return type.
  SmallVector<CallExpr *, 8> DelayedDecltypeCalls;

  /// \brief If we are processing a decltype type, a set of temporary binding
  /// expressions for which we have deferred checking the destructor.
  SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;

  ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
                                    unsigned NumCleanupObjects,
                                    CleanupInfo ParentCleanup,
                                    Decl *ManglingContextDecl,
                                    bool IsDecltype)
    : Context(Context), ParentCleanup(ParentCleanup),
      IsDecltype(IsDecltype), NumCleanupObjects(NumCleanupObjects),
      NumTypos(0),
      ManglingContextDecl(ManglingContextDecl), MangleNumbering() { }

  /// \brief Retrieve the mangling numbering context, used to consistently
  /// number constructs like lambdas for mangling.
  MangleNumberingContext &getMangleNumberingContext(ASTContext &Ctx);

  bool isUnevaluated() const {
    return Context == ExpressionEvaluationContext::Unevaluated ||
           Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
           Context == ExpressionEvaluationContext::UnevaluatedList;
  }
  bool isConstantEvaluated() const {
    return Context == ExpressionEvaluationContext::ConstantEvaluated;
  }
};

/// A stack of expression evaluation contexts.
SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;

/// \brief Compute the mangling number context for a lambda expression or
/// block literal.
///
/// \param DC - The DeclContext containing the lambda expression or
/// block literal.
/// \param[out] ManglingContextDecl - Returns the ManglingContextDecl
/// associated with the context, if relevant.
MangleNumberingContext *getCurrentMangleNumberContext(
  const DeclContext *DC,
  Decl *&ManglingContextDecl);


/// SpecialMemberOverloadResult - The overloading result for a special member
/// function.
///
/// This is basically a wrapper around PointerIntPair. The lowest bits of the
/// integer are used to determine whether overload resolution succeeded.
class SpecialMemberOverloadResult {
public:
  enum Kind {
    NoMemberOrDeleted,
    Ambiguous,
    Success
  };

private:
  llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;

public:
  SpecialMemberOverloadResult() : Pair() {}
  SpecialMemberOverloadResult(CXXMethodDecl *MD)
      : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}

  CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
  void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }

  Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
  void setKind(Kind K) { Pair.setInt(K); }
};

class SpecialMemberOverloadResultEntry
    : public llvm::FastFoldingSetNode,
      public SpecialMemberOverloadResult {
public:
  SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
    : FastFoldingSetNode(ID)
  {}
};

/// \brief A cache of special member function overload resolution results
/// for C++ records.
llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;

/// \brief A cache of the flags available in enumerations with the flag_bits
/// attribute.
mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;

/// \brief The kind of translation unit we are processing.
///
/// When we're processing a complete translation unit, Sema will perform
/// end-of-translation-unit semantic tasks (such as creating
/// initializers for tentative definitions in C) once parsing has
/// completed. Modules and precompiled headers perform different kinds of
/// checks.
TranslationUnitKind TUKind;

llvm::BumpPtrAllocator BumpAlloc;

/// \brief The number of SFINAE diagnostics that have been trapped.
unsigned NumSFINAEErrors;

typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
  UnparsedDefaultArgInstantiationsMap;

/// \brief A mapping from parameters with unparsed default arguments to the
/// set of instantiations of each parameter.
///
/// This mapping is a temporary data structure used when parsing
/// nested class templates or nested classes of class templates,
/// where we might end up instantiating an inner class before the
/// default arguments of its methods have been parsed.
UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;

// Contains the locations of the beginning of unparsed default
// argument locations.
llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;

/// UndefinedInternals - all the used, undefined objects which require a
/// definition in this translation unit.
llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;

/// Determine if VD, which must be a variable or function, is an external
/// symbol that nonetheless can't be referenced from outside this translation
/// unit because its type has no linkage and it's not extern "C".
bool isExternalWithNoLinkageType(ValueDecl *VD);

/// Obtain a sorted list of functions that are undefined but ODR-used.
void getUndefinedButUsed(
    SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);

/// Retrieves list of suspicious delete-expressions that will be checked at
/// the end of translation unit.
const llvm::MapVector<FieldDecl *, DeleteLocs> &
getMismatchingDeleteExpressions() const;

typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;

/// Method Pool - allows efficient lookup when typechecking messages to "id".
/// We need to maintain a list, since selectors can have differing signatures
/// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
/// of selectors are "overloaded").
/// At the head of the list it is recorded whether there were 0, 1, or >= 2
/// methods inside categories with a particular selector.
GlobalMethodPool MethodPool;

/// Method selectors used in a \@selector expression. Used for implementation
/// of -Wselector.
llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;

/// Kinds of C++ special members.
enum CXXSpecialMember {
  CXXDefaultConstructor,
  CXXCopyConstructor,
  CXXMoveConstructor,
  CXXCopyAssignment,
  CXXMoveAssignment,
  CXXDestructor,
  CXXInvalid
};

typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
    SpecialMemberDecl;

/// The C++ special members which we are currently in the process of
/// declaring. If this process recursively triggers the declaration of the
/// same special member, we should act as if it is not yet declared.
llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;

/// The function definitions which were renamed as part of typo-correction
/// to match their respective declarations. We want to keep track of them
/// to ensure that we don't emit a "redefinition" error if we encounter a
/// correctly named definition after the renamed definition.
llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;

/// Stack of types that correspond to the parameter entities that are
/// currently being copy-initialized. Can be empty.
llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;

void ReadMethodPool(Selector Sel);
void updateOutOfDateSelector(Selector Sel);

/// Private Helper predicate to check for 'self'.
bool isSelfExpr(Expr *RExpr);
bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);

/// \brief Cause the active diagnostic on the DiagosticsEngine to be
/// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
/// should not be used elsewhere.
void EmitCurrentDiagnostic(unsigned DiagID);

/// Records and restores the FP_CONTRACT state on entry/exit of compound
/// statements.
class FPContractStateRAII {
public:
  FPContractStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
  ~FPContractStateRAII() { S.FPFeatures = OldFPFeaturesState; }

private:
  Sema& S;
  FPOptions OldFPFeaturesState;
};

void addImplicitTypedef(StringRef Name, QualType T);

1184public:
Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
     TranslationUnitKind TUKind = TU_Complete,
     CodeCompleteConsumer *CompletionConsumer = nullptr);
~Sema();

/// \brief Perform initialization that occurs after the parser has been
/// initialized but before it parses anything.
void Initialize();

const LangOptions &getLangOpts() const { return LangOpts; }
OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
FPOptions     &getFPOptions() { return FPFeatures; }

DiagnosticsEngine &getDiagnostics() const { return Diags; }
SourceManager &getSourceManager() const { return SourceMgr; }
Preprocessor &getPreprocessor() const { return PP; }
ASTContext &getASTContext() const { return Context; }
ASTConsumer &getASTConsumer() const { return Consumer; }
ASTMutationListener *getASTMutationListener() const;
ExternalSemaSource* getExternalSource() const { return ExternalSource; }

///\brief Registers an external source. If an external source already exists,
/// creates a multiplex external source and appends to it.
///
///\param[in] E - A non-null external sema source.
///
void addExternalSource(ExternalSemaSource *E);

void PrintStats() const;

/// \brief Helper class that creates diagnostics with optional
/// template instantiation stacks.
///
/// This class provides a wrapper around the basic DiagnosticBuilder
/// class that emits diagnostics. SemaDiagnosticBuilder is
/// responsible for emitting the diagnostic (as DiagnosticBuilder
/// does) and, if the diagnostic comes from inside a template
/// instantiation, printing the template instantiation stack as
/// well.
class SemaDiagnosticBuilder : public DiagnosticBuilder {
  Sema &SemaRef;
  unsigned DiagID;

public:
  SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
    : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }

  // This is a cunning lie. DiagnosticBuilder actually performs move
  // construction in its copy constructor (but due to varied uses, it's not
  // possible to conveniently express this as actual move construction). So
  // the default copy ctor here is fine, because the base class disables the
  // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
  // in that case anwyay.
  SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;

  ~SemaDiagnosticBuilder() {
    // If we aren't active, there is nothing to do.
    if (!isActive()) return;

    // Otherwise, we need to emit the diagnostic. First flush the underlying
    // DiagnosticBuilder data, and clear the diagnostic builder itself so it
    // won't emit the diagnostic in its own destructor.
    //
    // This seems wasteful, in that as written the DiagnosticBuilder dtor will
    // do its own needless checks to see if the diagnostic needs to be
    // emitted. However, because we take care to ensure that the builder
    // objects never escape, a sufficiently smart compiler will be able to
    // eliminate that code.
    FlushCounts();
    Clear();

    // Dispatch to Sema to emit the diagnostic.
    SemaRef.EmitCurrentDiagnostic(DiagID);
  }

  /// Teach operator<< to produce an object of the correct type.
  template<typename T>
  friend const SemaDiagnosticBuilder &operator<<(
      const SemaDiagnosticBuilder &Diag, const T &Value) {
    const DiagnosticBuilder &BaseDiag = Diag;
    BaseDiag << Value;
    return Diag;
  }
};

/// \brief Emit a diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) {
  DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
  return SemaDiagnosticBuilder(DB, *this, DiagID);
}

/// \brief Emit a partial diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic& PD);

/// \brief Build a partial diagnostic.
PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h

bool findMacroSpelling(SourceLocation &loc, StringRef name);

/// \brief Get a string to suggest for zero-initialization of a type.
std::string
getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;

/// \brief Calls \c Lexer::getLocForEndOfToken()
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);

/// \brief Retrieve the module loader associated with the preprocessor.
ModuleLoader &getModuleLoader() const;

void emitAndClearUnusedLocalTypedefWarnings();

void ActOnStartOfTranslationUnit();
void ActOnEndOfTranslationUnit();

void CheckDelegatingCtorCycles();

Scope *getScopeForContext(DeclContext *Ctx);

void PushFunctionScope();
void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
sema::LambdaScopeInfo *PushLambdaScope();

/// \brief This is used to inform Sema what the current TemplateParameterDepth
/// is during Parsing.  Currently it is used to pass on the depth
/// when parsing generic lambda 'auto' parameters.
void RecordParsingTemplateParameterDepth(unsigned Depth);

void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
                             RecordDecl *RD,
                             CapturedRegionKind K);
void
PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
                     const Decl *D = nullptr,
                     const BlockExpr *blkExpr = nullptr);

sema::FunctionScopeInfo *getCurFunction() const {
  return FunctionScopes.back();
}

sema::FunctionScopeInfo *getEnclosingFunction() const {
  if (FunctionScopes.empty())
    return nullptr;

  for (int e = FunctionScopes.size()-1; e >= 0; --e) {
    if (isa<sema::BlockScopeInfo>(FunctionScopes[e]))
      continue;
    return FunctionScopes[e];
  }
  return nullptr;
}

template <typename ExprT>
void recordUseOfEvaluatedWeak(const ExprT *E, bool IsRead=true) {
  if (!isUnevaluatedContext())
    getCurFunction()->recordUseOfWeak(E, IsRead);
}

void PushCompoundScope(bool IsStmtExpr);
void PopCompoundScope();

sema::CompoundScopeInfo &getCurCompoundScope() const;

bool hasAnyUnrecoverableErrorsInThisFunction() const;

/// \brief Retrieve the current block, if any.
sema::BlockScopeInfo *getCurBlock();

/// Retrieve the current lambda scope info, if any.
/// \param IgnoreNonLambdaCapturingScope true if should find the top-most
/// lambda scope info ignoring all inner capturing scopes that are not
/// lambda scopes.
sema::LambdaScopeInfo *
getCurLambda(bool IgnoreNonLambdaCapturingScope = false);

/// \brief Retrieve the current generic lambda info, if any.
sema::LambdaScopeInfo *getCurGenericLambda();

/// \brief Retrieve the current captured region, if any.
sema::CapturedRegionScopeInfo *getCurCapturedRegion();

/// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }

void ActOnComment(SourceRange Comment);

//===--------------------------------------------------------------------===//
// Type Analysis / Processing: SemaType.cpp.
//

QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
                            const DeclSpec *DS = nullptr);
QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
                            const DeclSpec *DS = nullptr);
QualType BuildPointerType(QualType T,
                          SourceLocation Loc, DeclarationName Entity);
QualType BuildReferenceType(QualType T, bool LValueRef,
                            SourceLocation Loc, DeclarationName Entity);
QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
                        Expr *ArraySize, unsigned Quals,
                        SourceRange Brackets, DeclarationName Entity);
QualType BuildExtVectorType(QualType T, Expr *ArraySize,
                            SourceLocation AttrLoc);
QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
                               SourceLocation AttrLoc);

bool CheckFunctionReturnType(QualType T, SourceLocation Loc);

/// \brief Build a function type.
///
/// This routine checks the function type according to C++ rules and
/// under the assumption that the result type and parameter types have
/// just been instantiated from a template. It therefore duplicates
/// some of the behavior of GetTypeForDeclarator, but in a much
/// simpler form that is only suitable for this narrow use case.
///
/// \param T The return type of the function.
///
/// \param ParamTypes The parameter types of the function. This array
/// will be modified to account for adjustments to the types of the
/// function parameters.
///
/// \param Loc The location of the entity whose type involves this
/// function type or, if there is no such entity, the location of the
/// type that will have function type.
///
/// \param Entity The name of the entity that involves the function
/// type, if known.
///
/// \param EPI Extra information about the function type. Usually this will
/// be taken from an existing function with the same prototype.
///
/// \returns A suitable function type, if there are no errors. The
/// unqualified type will always be a FunctionProtoType.
/// Otherwise, returns a NULL type.
QualType BuildFunctionType(QualType T,
                           MutableArrayRef<QualType> ParamTypes,
                           SourceLocation Loc, DeclarationName Entity,
                           const FunctionProtoType::ExtProtoInfo &EPI);

QualType BuildMemberPointerType(QualType T, QualType Class,
                                SourceLocation Loc,
                                DeclarationName Entity);
QualType BuildBlockPointerType(QualType T,
                               SourceLocation Loc, DeclarationName Entity);
QualType BuildParenType(QualType T);
QualType BuildAtomicType(QualType T, SourceLocation Loc);
QualType BuildReadPipeType(QualType T,
                       SourceLocation Loc);
QualType BuildWritePipeType(QualType T,
                       SourceLocation Loc);

TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
                                             TypeSourceInfo *ReturnTypeInfo);

/// \brief Package the given type and TSI into a ParsedType.
ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
DeclarationNameInfo GetNameForDeclarator(Declarator &D);
DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
static QualType GetTypeFromParser(ParsedType Ty,
                                  TypeSourceInfo **TInfo = nullptr);
CanThrowResult canThrow(const Expr *E);
const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
                                              const FunctionProtoType *FPT);
void UpdateExceptionSpec(FunctionDecl *FD,
                         const FunctionProtoType::ExceptionSpecInfo &ESI);
bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
bool CheckDistantExceptionSpec(QualType T);
bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
bool CheckEquivalentExceptionSpec(
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool CheckEquivalentExceptionSpec(
    const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
                              const PartialDiagnostic &NestedDiagID,
                              const PartialDiagnostic &NoteID,
                              const FunctionProtoType *Superset,
                              SourceLocation SuperLoc,
                              const FunctionProtoType *Subset,
                              SourceLocation SubLoc);
bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
                             const PartialDiagnostic &NoteID,
                             const FunctionProtoType *Target,
                             SourceLocation TargetLoc,
                             const FunctionProtoType *Source,
                             SourceLocation SourceLoc);

TypeResult ActOnTypeName(Scope *S, Declarator &D);

/// \brief The parser has parsed the context-sensitive type 'instancetype'
/// in an Objective-C message declaration. Return the appropriate type.
ParsedType ActOnObjCInstanceType(SourceLocation Loc);

/// \brief Abstract class used to diagnose incomplete types.
struct TypeDiagnoser {
  TypeDiagnoser() {}

  virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
  virtual ~TypeDiagnoser() {}
};

static int getPrintable(int I) { return I; }
static unsigned getPrintable(unsigned I) { return I; }
static bool getPrintable(bool B) { return B; }
static const char * getPrintable(const char *S) { return S; }
static StringRef getPrintable(StringRef S) { return S; }
static const std::string &getPrintable(const std::string &S) { return S; }
static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
  return II;
}
static DeclarationName getPrintable(DeclarationName N) { return N; }
static QualType getPrintable(QualType T) { return T; }
static SourceRange getPrintable(SourceRange R) { return R; }
static SourceRange getPrintable(SourceLocation L) { return L; }
static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}

template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
  unsigned DiagID;
  std::tuple<const Ts &...> Args;

  template <std::size_t... Is>
  void emit(const SemaDiagnosticBuilder &DB,
            llvm::index_sequence<Is...>) const {
    // Apply all tuple elements to the builder in order.
    bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
    (void)Dummy;
  }

public:
  BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
      : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
    assert(DiagID != 0 && "no diagnostic for type diagnoser")(static_cast <bool> (DiagID != 0 && "no diagnostic for type diagnoser"
) ? void (0) : __assert_fail ("DiagID != 0 && \"no diagnostic for type diagnoser\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1523, __extension__ __PRETTY_FUNCTION__));
  }

  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
    const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
    emit(DB, llvm::index_sequence_for<Ts...>());
    DB << T;
  }
};

1533private:
bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
                             TypeDiagnoser *Diagnoser);

struct ModuleScope {
  clang::Module *Module = nullptr;
  bool ModuleInterface = false;
  VisibleModuleSet OuterVisibleModules;
};
/// The modules we're currently parsing.
llvm::SmallVector<ModuleScope, 16> ModuleScopes;

/// Get the module whose scope we are currently within.
Module *getCurrentModule() const {
  return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
}

VisibleModuleSet VisibleModules;

1552public:
/// \brief Get the module owning an entity.
Module *getOwningModule(Decl *Entity) { return Entity->getOwningModule(); }

/// \brief Make a merged definition of an existing hidden definition \p ND
/// visible at the specified location.
void makeMergedDefinitionVisible(NamedDecl *ND);

bool isModuleVisible(const Module *M) { return VisibleModules.isVisible(M); }

/// Determine whether a declaration is visible to name lookup.
bool isVisible(const NamedDecl *D) {
  return !D->isHidden() || isVisibleSlow(D);
}

/// Determine whether any declaration of an entity is visible.
bool
hasVisibleDeclaration(const NamedDecl *D,
                      llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
  return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
}
bool hasVisibleDeclarationSlow(const NamedDecl *D,
                               llvm::SmallVectorImpl<Module *> *Modules);

bool hasVisibleMergedDefinition(NamedDecl *Def);
bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);

/// Determine if \p D and \p Suggested have a structurally compatible
/// layout as described in C11 6.2.7/1.
bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);

/// Determine if \p D has a visible definition. If not, suggest a declaration
/// that should be made visible to expose the definition.
bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
                          bool OnlyNeedComplete = false);
bool hasVisibleDefinition(const NamedDecl *D) {
  NamedDecl *Hidden;
  return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
}

/// Determine if the template parameter \p D has a visible default argument.
bool
hasVisibleDefaultArgument(const NamedDecl *D,
                          llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is an explicit
/// specialization declaration for a specialization of a template. (For a
/// member specialization, use hasVisibleMemberSpecialization.)
bool hasVisibleExplicitSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is a member
/// specialization declaration (as opposed to an instantiated declaration).
bool hasVisibleMemberSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if \p A and \p B are equivalent internal linkage declarations
/// from different modules, and thus an ambiguity error can be downgraded to
/// an extension warning.
bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
                                            const NamedDecl *B);
void diagnoseEquivalentInternalLinkageDeclarations(
    SourceLocation Loc, const NamedDecl *D,
    ArrayRef<const NamedDecl *> Equiv);

bool isCompleteType(SourceLocation Loc, QualType T) {
  return !RequireCompleteTypeImpl(Loc, T, nullptr);
}
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         TypeDiagnoser &Diagnoser);
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         unsigned DiagID);

template <typename... Ts>
bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
                         const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteType(Loc, T, Diagnoser);
}

void completeExprArrayBound(Expr *E);
bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
bool RequireCompleteExprType(Expr *E, unsigned DiagID);

template <typename... Ts>
bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteExprType(E, Diagnoser);
}

bool RequireLiteralType(SourceLocation Loc, QualType T,
                        TypeDiagnoser &Diagnoser);
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);

template <typename... Ts>
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
                        const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireLiteralType(Loc, T, Diagnoser);
}

QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
                           const CXXScopeSpec &SS, QualType T);

QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
/// If AsUnevaluated is false, E is treated as though it were an evaluated
/// context, such as when building a type for decltype(auto).
QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
                           bool AsUnevaluated = true);
QualType BuildUnaryTransformType(QualType BaseType,
                                 UnaryTransformType::UTTKind UKind,
                                 SourceLocation Loc);

//===--------------------------------------------------------------------===//
// Symbol table / Decl tracking callbacks: SemaDecl.cpp.
//

struct SkipBodyInfo {
  SkipBodyInfo()
      : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
        New(nullptr) {}
  bool ShouldSkip;
  bool CheckSameAsPrevious;
  NamedDecl *Previous;
  NamedDecl *New;
};

DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);

void DiagnoseUseOfUnimplementedSelectors();

bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;

ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
                       Scope *S, CXXScopeSpec *SS = nullptr,
                       bool isClassName = false, bool HasTrailingDot = false,
                       ParsedType ObjectType = nullptr,
                       bool IsCtorOrDtorName = false,
                       bool WantNontrivialTypeSourceInfo = false,
                       bool IsClassTemplateDeductionContext = true,
                       IdentifierInfo **CorrectedII = nullptr);
TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
void DiagnoseUnknownTypeName(IdentifierInfo *&II,
                             SourceLocation IILoc,
                             Scope *S,
                             CXXScopeSpec *SS,
                             ParsedType &SuggestedType,
                             bool IsTemplateName = false);

/// Attempt to behave like MSVC in situations where lookup of an unqualified
/// type name has failed in a dependent context. In these situations, we
/// automatically form a DependentTypeName that will retry lookup in a related
/// scope during instantiation.
ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
                                    SourceLocation NameLoc,
                                    bool IsTemplateTypeArg);

/// \brief Describes the result of the name lookup and resolution performed
/// by \c ClassifyName().
enum NameClassificationKind {
  NC_Unknown,
  NC_Error,
  NC_Keyword,
  NC_Type,
  NC_Expression,
  NC_NestedNameSpecifier,
  NC_TypeTemplate,
  NC_VarTemplate,
  NC_FunctionTemplate
};

class NameClassification {
  NameClassificationKind Kind;
  ExprResult Expr;
  TemplateName Template;
  ParsedType Type;

  explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}

public:
  NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}

  NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}

  NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}

  static NameClassification Error() {
    return NameClassification(NC_Error);
  }

  static NameClassification Unknown() {
    return NameClassification(NC_Unknown);
  }

  static NameClassification NestedNameSpecifier() {
    return NameClassification(NC_NestedNameSpecifier);
  }

  static NameClassification TypeTemplate(TemplateName Name) {
    NameClassification Result(NC_TypeTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification VarTemplate(TemplateName Name) {
    NameClassification Result(NC_VarTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification FunctionTemplate(TemplateName Name) {
    NameClassification Result(NC_FunctionTemplate);
    Result.Template = Name;
    return Result;
  }

  NameClassificationKind getKind() const { return Kind; }

  ParsedType getType() const {
    assert(Kind == NC_Type)(static_cast <bool> (Kind == NC_Type) ? void (0) : __assert_fail
 ("Kind == NC_Type", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1772, __extension__ __PRETTY_FUNCTION__));
    return Type;
  }

  ExprResult getExpression() const {
    assert(Kind == NC_Expression)(static_cast <bool> (Kind == NC_Expression) ? void (0) :
 __assert_fail ("Kind == NC_Expression", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1777, __extension__ __PRETTY_FUNCTION__));
    return Expr;
  }

  TemplateName getTemplateName() const {
    assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||(static_cast <bool> (Kind == NC_TypeTemplate || Kind ==
 NC_FunctionTemplate || Kind == NC_VarTemplate) ? void (0) : __assert_fail
 ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1783, __extension__ __PRETTY_FUNCTION__))
           Kind == NC_VarTemplate)(static_cast <bool> (Kind == NC_TypeTemplate || Kind ==
 NC_FunctionTemplate || Kind == NC_VarTemplate) ? void (0) : __assert_fail
 ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1783, __extension__ __PRETTY_FUNCTION__));
    return Template;
  }

  TemplateNameKind getTemplateNameKind() const {
    switch (Kind) {
    case NC_TypeTemplate:
      return TNK_Type_template;
    case NC_FunctionTemplate:
      return TNK_Function_template;
    case NC_VarTemplate:
      return TNK_Var_template;
    default:
      llvm_unreachable("unsupported name classification.")::llvm::llvm_unreachable_internal("unsupported name classification."
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 1796);
    }
  }
};

/// \brief Perform name lookup on the given name, classifying it based on
/// the results of name lookup and the following token.
///
/// This routine is used by the parser to resolve identifiers and help direct
/// parsing. When the identifier cannot be found, this routine will attempt
/// to correct the typo and classify based on the resulting name.
///
/// \param S The scope in which we're performing name lookup.
///
/// \param SS The nested-name-specifier that precedes the name.
///
/// \param Name The identifier. If typo correction finds an alternative name,
/// this pointer parameter will be updated accordingly.
///
/// \param NameLoc The location of the identifier.
///
/// \param NextToken The token following the identifier. Used to help
/// disambiguate the name.
///
/// \param IsAddressOfOperand True if this name is the operand of a unary
///        address of ('&') expression, assuming it is classified as an
///        expression.
///
/// \param CCC The correction callback, if typo correction is desired.
NameClassification
ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name,
             SourceLocation NameLoc, const Token &NextToken,
             bool IsAddressOfOperand,
             std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr);

/// Describes the detailed kind of a template name. Used in diagnostics.
enum class TemplateNameKindForDiagnostics {
  ClassTemplate,
  FunctionTemplate,
  VarTemplate,
  AliasTemplate,
  TemplateTemplateParam,
  DependentTemplate
};
TemplateNameKindForDiagnostics
getTemplateNameKindForDiagnostics(TemplateName Name);

/// Determine whether it's plausible that E was intended to be a
/// template-name.
bool mightBeIntendedToBeTemplateName(ExprResult E) {
  if (!getLangOpts().CPlusPlus || E.isInvalid())
    return false;
  if (auto *DRE = dyn_cast<DeclRefExpr>(E.get()))
    return !DRE->hasExplicitTemplateArgs();
  if (auto *ME = dyn_cast<MemberExpr>(E.get()))
    return !ME->hasExplicitTemplateArgs();
  // Any additional cases recognized here should also be handled by
  // diagnoseExprIntendedAsTemplateName.
  return false;
}
void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
                                        SourceLocation Less,
                                        SourceLocation Greater);

Decl *ActOnDeclarator(Scope *S, Declarator &D);

NamedDecl *HandleDeclarator(Scope *S, Declarator &D,
                            MultiTemplateParamsArg TemplateParameterLists);
void RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S);
bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
                                  DeclarationName Name,
                                  SourceLocation Loc);
void
diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
                          SourceLocation FallbackLoc,
                          SourceLocation ConstQualLoc = SourceLocation(),
                          SourceLocation VolatileQualLoc = SourceLocation(),
                          SourceLocation RestrictQualLoc = SourceLocation(),
                          SourceLocation AtomicQualLoc = SourceLocation(),
                          SourceLocation UnalignedQualLoc = SourceLocation());

static bool adjustContextForLocalExternDecl(DeclContext *&DC);
void DiagnoseFunctionSpecifiers(const DeclSpec &DS);
NamedDecl *getShadowedDeclaration(const TypedefNameDecl *D,
                                  const LookupResult &R);
NamedDecl *getShadowedDeclaration(const VarDecl *D, const LookupResult &R);
void CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl,
                 const LookupResult &R);
void CheckShadow(Scope *S, VarDecl *D);

/// Warn if 'E', which is an expression that is about to be modified, refers
/// to a shadowing declaration.
void CheckShadowingDeclModification(Expr *E, SourceLocation Loc);

void DiagnoseShadowingLambdaDecls(const sema::LambdaScopeInfo *LSI);

1893private:
/// Map of current shadowing declarations to shadowed declarations. Warn if
/// it looks like the user is trying to modify the shadowing declaration.
llvm::DenseMap<const NamedDecl *, const NamedDecl *> ShadowingDecls;

1898public:
void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
void handleTagNumbering(const TagDecl *Tag, Scope *TagScope);
void setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
                                  TypedefNameDecl *NewTD);
void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                  TypeSourceInfo *TInfo,
                                  LookupResult &Previous);
NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
                                LookupResult &Previous, bool &Redeclaration);
NamedDecl *ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope,
                                   ArrayRef<BindingDecl *> Bindings = None);
NamedDecl *
ActOnDecompositionDeclarator(Scope *S, Declarator &D,
                             MultiTemplateParamsArg TemplateParamLists);
// Returns true if the variable declaration is a redeclaration
bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
void CheckVariableDeclarationType(VarDecl *NewVD);
bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
                                   Expr *Init);
void CheckCompleteVariableDeclaration(VarDecl *VD);
void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);

NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope);
bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);

bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);

void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD);
void FindHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
void NoteHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
// Returns true if the function declaration is a redeclaration
bool CheckFunctionDeclaration(Scope *S,
                              FunctionDecl *NewFD, LookupResult &Previous,
                              bool IsMemberSpecialization);
bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
void CheckMain(FunctionDecl *FD, const DeclSpec &D);
void CheckMSVCRTEntryPoint(FunctionDecl *FD);
Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
                                        SourceLocation Loc,
                                        QualType T);
ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
                            SourceLocation NameLoc, IdentifierInfo *Name,
                            QualType T, TypeSourceInfo *TSInfo,
                            StorageClass SC);
void ActOnParamDefaultArgument(Decl *param,
                               SourceLocation EqualLoc,
                               Expr *defarg);
void ActOnParamUnparsedDefaultArgument(Decl *param,
                                       SourceLocation EqualLoc,
                                       SourceLocation ArgLoc);
void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc);
bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
                             SourceLocation EqualLoc);

void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit);
void ActOnUninitializedDecl(Decl *dcl);
void ActOnInitializerError(Decl *Dcl);

void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc);
void ActOnCXXForRangeDecl(Decl *D);
StmtResult ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
                                      IdentifierInfo *Ident,
                                      ParsedAttributes &Attrs,
                                      SourceLocation AttrEnd);
void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
void FinalizeDeclaration(Decl *D);
DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
                                       ArrayRef<Decl *> Group);
DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef<Decl *> Group);

/// Should be called on all declarations that might have attached
/// documentation comments.
void ActOnDocumentableDecl(Decl *D);
void ActOnDocumentableDecls(ArrayRef<Decl *> Group);

void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
                                     SourceLocation LocAfterDecls);
void CheckForFunctionRedefinition(
    FunctionDecl *FD, const FunctionDecl *EffectiveDefinition = nullptr,
    SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D,
                              MultiTemplateParamsArg TemplateParamLists,
                              SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D,
                              SkipBodyInfo *SkipBody = nullptr);
void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
bool isObjCMethodDecl(Decl *D) {
  return D && isa<ObjCMethodDecl>(D);
}

/// \brief Determine whether we can delay parsing the body of a function or
/// function template until it is used, assuming we don't care about emitting
/// code for that function.
///
/// This will be \c false if we may need the body of the function in the
/// middle of parsing an expression (where it's impractical to switch to
/// parsing a different function), for instance, if it's constexpr in C++11
/// or has an 'auto' return type in C++14. These cases are essentially bugs.
bool canDelayFunctionBody(const Declarator &D);

/// \brief Determine whether we can skip parsing the body of a function
/// definition, assuming we don't care about analyzing its body or emitting
/// code for that function.
///
/// This will be \c false only if we may need the body of the function in
/// order to parse the rest of the program (for instance, if it is
/// \c constexpr in C++11 or has an 'auto' return type in C++14).
bool canSkipFunctionBody(Decl *D);

void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
Decl *ActOnSkippedFunctionBody(Decl *Decl);
void ActOnFinishInlineFunctionDef(FunctionDecl *D);

/// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
/// attribute for which parsing is delayed.
void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);

/// \brief Diagnose any unused parameters in the given sequence of
/// ParmVarDecl pointers.
void DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters);

/// \brief Diagnose whether the size of parameters or return value of a
/// function or obj-c method definition is pass-by-value and larger than a
/// specified threshold.
void
DiagnoseSizeOfParametersAndReturnValue(ArrayRef<ParmVarDecl *> Parameters,
                                       QualType ReturnTy, NamedDecl *D);

void DiagnoseInvalidJumps(Stmt *Body);
Decl *ActOnFileScopeAsmDecl(Expr *expr,
                            SourceLocation AsmLoc,
                            SourceLocation RParenLoc);

/// \brief Handle a C++11 empty-declaration and attribute-declaration.
Decl *ActOnEmptyDeclaration(Scope *S,
                            AttributeList *AttrList,
                            SourceLocation SemiLoc);

enum class ModuleDeclKind {
  Interface,      ///< 'export module X;'
  Implementation, ///< 'module X;'
  Partition,      ///< 'module partition X;'
};

/// The parser has processed a module-declaration that begins the definition
/// of a module interface or implementation.
DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc,
                               SourceLocation ModuleLoc, ModuleDeclKind MDK,
                               ModuleIdPath Path);

/// \brief The parser has processed a module import declaration.
///
/// \param AtLoc The location of the '@' symbol, if any.
///
/// \param ImportLoc The location of the 'import' keyword.
///
/// \param Path The module access path.
DeclResult ActOnModuleImport(SourceLocation AtLoc, SourceLocation ImportLoc,
                             ModuleIdPath Path);

/// \brief The parser has processed a module import translated from a
/// #include or similar preprocessing directive.
void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
void BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod);

/// \brief The parsed has entered a submodule.
void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod);
/// \brief The parser has left a submodule.
void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod);

/// \brief Create an implicit import of the given module at the given
/// source location, for error recovery, if possible.
///
/// This routine is typically used when an entity found by name lookup
/// is actually hidden within a module that we know about but the user
/// has forgotten to import.
void createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
                                                Module *Mod);

/// Kinds of missing import. Note, the values of these enumerators correspond
/// to %select values in diagnostics.
enum class MissingImportKind {
  Declaration,
  Definition,
  DefaultArgument,
  ExplicitSpecialization,
  PartialSpecialization
};

/// \brief Diagnose that the specified declaration needs to be visible but
/// isn't, and suggest a module import that would resolve the problem.
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           MissingImportKind MIK, bool Recover = true);
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           SourceLocation DeclLoc, ArrayRef<Module *> Modules,
                           MissingImportKind MIK, bool Recover);

Decl *ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
                           SourceLocation LBraceLoc);
Decl *ActOnFinishExportDecl(Scope *S, Decl *ExportDecl,
                            SourceLocation RBraceLoc);

/// \brief We've found a use of a templated declaration that would trigger an
/// implicit instantiation. Check that any relevant explicit specializations
/// and partial specializations are visible, and diagnose if not.
void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);

/// \brief We've found a use of a template specialization that would select a
/// partial specialization. Check that the partial specialization is visible,
/// and diagnose if not.
void checkPartialSpecializationVisibility(SourceLocation Loc,
                                          NamedDecl *Spec);

/// \brief Retrieve a suitable printing policy.
PrintingPolicy getPrintingPolicy() const {
  return getPrintingPolicy(Context, PP);
}

/// \brief Retrieve a suitable printing policy.
static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
                                        const Preprocessor &PP);

/// Scope actions.
void ActOnPopScope(SourceLocation Loc, Scope *S);
void ActOnTranslationUnitScope(Scope *S);

Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 RecordDecl *&AnonRecord);
Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 MultiTemplateParamsArg TemplateParams,
                                 bool IsExplicitInstantiation,
                                 RecordDecl *&AnonRecord);

Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
                                  AccessSpecifier AS,
                                  RecordDecl *Record,
                                  const PrintingPolicy &Policy);

Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
                                     RecordDecl *Record);

/// Common ways to introduce type names without a tag for use in diagnostics.
/// Keep in sync with err_tag_reference_non_tag.
enum NonTagKind {
  NTK_NonStruct,
  NTK_NonClass,
  NTK_NonUnion,
  NTK_NonEnum,
  NTK_Typedef,
  NTK_TypeAlias,
  NTK_Template,
  NTK_TypeAliasTemplate,
  NTK_TemplateTemplateArgument,
};

/// Given a non-tag type declaration, returns an enum useful for indicating
/// what kind of non-tag type this is.
NonTagKind getNonTagTypeDeclKind(const Decl *D, TagTypeKind TTK);

bool isAcceptableTagRedeclaration(const TagDecl *Previous,
                                  TagTypeKind NewTag, bool isDefinition,
                                  SourceLocation NewTagLoc,
                                  const IdentifierInfo *Name);

enum TagUseKind {
  TUK_Reference,   // Reference to a tag:  'struct foo *X;'
  TUK_Declaration, // Fwd decl of a tag:   'struct foo;'
  TUK_Definition,  // Definition of a tag: 'struct foo { int X; } Y;'
  TUK_Friend       // Friend declaration:  'friend struct foo;'
};

Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
               SourceLocation KWLoc, CXXScopeSpec &SS, IdentifierInfo *Name,
               SourceLocation NameLoc, AttributeList *Attr,
               AccessSpecifier AS, SourceLocation ModulePrivateLoc,
               MultiTemplateParamsArg TemplateParameterLists, bool &OwnedDecl,
               bool &IsDependent, SourceLocation ScopedEnumKWLoc,
               bool ScopedEnumUsesClassTag, TypeResult UnderlyingType,
               bool IsTypeSpecifier, bool IsTemplateParamOrArg,
               SkipBodyInfo *SkipBody = nullptr);

Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
                              unsigned TagSpec, SourceLocation TagLoc,
                              CXXScopeSpec &SS,
                              IdentifierInfo *Name, SourceLocation NameLoc,
                              AttributeList *Attr,
                              MultiTemplateParamsArg TempParamLists);

TypeResult ActOnDependentTag(Scope *S,
                             unsigned TagSpec,
                             TagUseKind TUK,
                             const CXXScopeSpec &SS,
                             IdentifierInfo *Name,
                             SourceLocation TagLoc,
                             SourceLocation NameLoc);

void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
               IdentifierInfo *ClassName,
               SmallVectorImpl<Decl *> &Decls);
Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
                 Declarator &D, Expr *BitfieldWidth);

FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
                       Declarator &D, Expr *BitfieldWidth,
                       InClassInitStyle InitStyle,
                       AccessSpecifier AS);
MSPropertyDecl *HandleMSProperty(Scope *S, RecordDecl *TagD,
                                 SourceLocation DeclStart,
                                 Declarator &D, Expr *BitfieldWidth,
                                 InClassInitStyle InitStyle,
                                 AccessSpecifier AS,
                                 AttributeList *MSPropertyAttr);

FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
                          TypeSourceInfo *TInfo,
                          RecordDecl *Record, SourceLocation Loc,
                          bool Mutable, Expr *BitfieldWidth,
                          InClassInitStyle InitStyle,
                          SourceLocation TSSL,
                          AccessSpecifier AS, NamedDecl *PrevDecl,
                          Declarator *D = nullptr);

bool CheckNontrivialField(FieldDecl *FD);
void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM);

enum TrivialABIHandling {
  /// The triviality of a method unaffected by "trivial_abi".
  TAH_IgnoreTrivialABI,

  /// The triviality of a method affected by "trivial_abi".
  TAH_ConsiderTrivialABI
};

bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
                            TrivialABIHandling TAH = TAH_IgnoreTrivialABI,
                            bool Diagnose = false);
CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
void ActOnLastBitfield(SourceLocation DeclStart,
                       SmallVectorImpl<Decl *> &AllIvarDecls);
Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
                Declarator &D, Expr *BitfieldWidth,
                tok::ObjCKeywordKind visibility);

// This is used for both record definitions and ObjC interface declarations.
void ActOnFields(Scope* S, SourceLocation RecLoc, Decl *TagDecl,
                 ArrayRef<Decl *> Fields,
                 SourceLocation LBrac, SourceLocation RBrac,
                 AttributeList *AttrList);

/// ActOnTagStartDefinition - Invoked when we have entered the
/// scope of a tag's definition (e.g., for an enumeration, class,
/// struct, or union).
void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);

/// Perform ODR-like check for C/ObjC when merging tag types from modules.
/// Differently from C++, actually parse the body and reject / error out
/// in case of a structural mismatch.
bool ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev,
                              SkipBodyInfo &SkipBody);

typedef void *SkippedDefinitionContext;

/// \brief Invoked when we enter a tag definition that we're skipping.
SkippedDefinitionContext ActOnTagStartSkippedDefinition(Scope *S, Decl *TD);

Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);

/// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
/// C++ record definition's base-specifiers clause and are starting its
/// member declarations.
void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
                                     SourceLocation FinalLoc,
                                     bool IsFinalSpelledSealed,
                                     SourceLocation LBraceLoc);

/// ActOnTagFinishDefinition - Invoked once we have finished parsing
/// the definition of a tag (enumeration, class, struct, or union).
void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
                              SourceRange BraceRange);

void ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context);

void ActOnObjCContainerFinishDefinition();

/// \brief Invoked when we must temporarily exit the objective-c container
/// scope for parsing/looking-up C constructs.
///
/// Must be followed by a call to \see ActOnObjCReenterContainerContext
void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
void ActOnObjCReenterContainerContext(DeclContext *DC);

/// ActOnTagDefinitionError - Invoked when there was an unrecoverable
/// error parsing the definition of a tag.
void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);

EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
                                    EnumConstantDecl *LastEnumConst,
                                    SourceLocation IdLoc,
                                    IdentifierInfo *Id,
                                    Expr *val);
bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
                            QualType EnumUnderlyingTy, bool IsFixed,
                            const EnumDecl *Prev);

/// Determine whether the body of an anonymous enumeration should be skipped.
/// \param II The name of the first enumerator.
SkipBodyInfo shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
                                    SourceLocation IILoc);

Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
                        SourceLocation IdLoc, IdentifierInfo *Id,
                        AttributeList *Attrs, SourceLocation EqualLoc,
                        Expr *Val);
void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
                   Decl *EnumDecl,
                   ArrayRef<Decl *> Elements,
                   Scope *S, AttributeList *Attr);

DeclContext *getContainingDC(DeclContext *DC);

/// Set the current declaration context until it gets popped.
void PushDeclContext(Scope *S, DeclContext *DC);
void PopDeclContext();

/// EnterDeclaratorContext - Used when we must lookup names in the context
/// of a declarator's nested name specifier.
void EnterDeclaratorContext(Scope *S, DeclContext *DC);
void ExitDeclaratorContext(Scope *S);

/// Push the parameters of D, which must be a function, into scope.
void ActOnReenterFunctionContext(Scope* S, Decl* D);
void ActOnExitFunctionContext();

DeclContext *getFunctionLevelDeclContext();

/// getCurFunctionDecl - If inside of a function body, this returns a pointer
/// to the function decl for the function being parsed.  If we're currently
/// in a 'block', this returns the containing context.
FunctionDecl *getCurFunctionDecl();

/// getCurMethodDecl - If inside of a method body, this returns a pointer to
/// the method decl for the method being parsed.  If we're currently
/// in a 'block', this returns the containing context.
ObjCMethodDecl *getCurMethodDecl();

/// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
/// or C function we're in, otherwise return null.  If we're currently
/// in a 'block', this returns the containing context.
NamedDecl *getCurFunctionOrMethodDecl();

/// Add this decl to the scope shadowed decl chains.
void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);

/// \brief Make the given externally-produced declaration visible at the
/// top level scope.
///
/// \param D The externally-produced declaration to push.
///
/// \param Name The name of the externally-produced declaration.
void pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name);

/// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
/// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
/// true if 'D' belongs to the given declaration context.
///
/// \param AllowInlineNamespace If \c true, allow the declaration to be in the
///        enclosing namespace set of the context, rather than contained
///        directly within it.
bool isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S = nullptr,
                   bool AllowInlineNamespace = false);

/// Finds the scope corresponding to the given decl context, if it
/// happens to be an enclosing scope.  Otherwise return NULL.
static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);

/// Subroutines of ActOnDeclarator().
TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
                              TypeSourceInfo *TInfo);
bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);

/// \brief Describes the kind of merge to perform for availability
/// attributes (including "deprecated", "unavailable", and "availability").
enum AvailabilityMergeKind {
  /// \brief Don't merge availability attributes at all.
  AMK_None,
  /// \brief Merge availability attributes for a redeclaration, which requires
  /// an exact match.
  AMK_Redeclaration,
  /// \brief Merge availability attributes for an override, which requires
  /// an exact match or a weakening of constraints.
  AMK_Override,
  /// \brief Merge availability attributes for an implementation of
  /// a protocol requirement.
  AMK_ProtocolImplementation,
};

/// Attribute merging methods. Return true if a new attribute was added.
AvailabilityAttr *mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
                                        IdentifierInfo *Platform,
                                        bool Implicit,
                                        VersionTuple Introduced,
                                        VersionTuple Deprecated,
                                        VersionTuple Obsoleted,
                                        bool IsUnavailable,
                                        StringRef Message,
                                        bool IsStrict, StringRef Replacement,
                                        AvailabilityMergeKind AMK,
                                        unsigned AttrSpellingListIndex);
TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
                                     TypeVisibilityAttr::VisibilityType Vis,
                                            unsigned AttrSpellingListIndex);
VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
                                    VisibilityAttr::VisibilityType Vis,
                                    unsigned AttrSpellingListIndex);
UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
                        unsigned AttrSpellingListIndex, StringRef Uuid);
DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
MSInheritanceAttr *
mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
                       unsigned AttrSpellingListIndex,
                       MSInheritanceAttr::Spelling SemanticSpelling);
FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
                            IdentifierInfo *Format, int FormatIdx,
                            int FirstArg, unsigned AttrSpellingListIndex);
SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
                              unsigned AttrSpellingListIndex);
AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
                                        IdentifierInfo *Ident,
                                        unsigned AttrSpellingListIndex);
MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
                              unsigned AttrSpellingListIndex);
OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
                                        unsigned AttrSpellingListIndex);
InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, SourceRange Range,
                                              IdentifierInfo *Ident,
                                              unsigned AttrSpellingListIndex);
CommonAttr *mergeCommonAttr(Decl *D, SourceRange Range, IdentifierInfo *Ident,
                            unsigned AttrSpellingListIndex);

void mergeDeclAttributes(NamedDecl *New, Decl *Old,
                         AvailabilityMergeKind AMK = AMK_Redeclaration);
void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
                          LookupResult &OldDecls);
bool MergeFunctionDecl(FunctionDecl *New, NamedDecl *&Old, Scope *S,
                       bool MergeTypeWithOld);
bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
                                  Scope *S, bool MergeTypeWithOld);
void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
void MergeVarDecl(VarDecl *New, LookupResult &Previous);
void MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool MergeTypeWithOld);
void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
bool checkVarDeclRedefinition(VarDecl *OldDefn, VarDecl *NewDefn);
void notePreviousDefinition(const NamedDecl *Old, SourceLocation New);
bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);

// AssignmentAction - This is used by all the assignment diagnostic functions
// to represent what is actually causing the operation
enum AssignmentAction {
  AA_Assigning,
  AA_Passing,
  AA_Returning,
  AA_Converting,
  AA_Initializing,
  AA_Sending,
  AA_Casting,
  AA_Passing_CFAudited
};

/// C++ Overloading.
enum OverloadKind {
  /// This is a legitimate overload: the existing declarations are
  /// functions or function templates with different signatures.
  Ovl_Overload,

  /// This is not an overload because the signature exactly matches
  /// an existing declaration.
  Ovl_Match,

  /// This is not an overload because the lookup results contain a
  /// non-function.
  Ovl_NonFunction
};
OverloadKind CheckOverload(Scope *S,
                           FunctionDecl *New,
                           const LookupResult &OldDecls,
                           NamedDecl *&OldDecl,
                           bool IsForUsingDecl);
bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl,
                bool ConsiderCudaAttrs = true);

/// \brief Checks availability of the function depending on the current
/// function context.Inside an unavailable function,unavailability is ignored.
///
/// \returns true if \p FD is unavailable and current context is inside
/// an available function, false otherwise.
bool isFunctionConsideredUnavailable(FunctionDecl *FD);

ImplicitConversionSequence
TryImplicitConversion(Expr *From, QualType ToType,
                      bool SuppressUserConversions,
                      bool AllowExplicit,
                      bool InOverloadResolution,
                      bool CStyle,
                      bool AllowObjCWritebackConversion);

bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
bool IsComplexPromotion(QualType FromType, QualType ToType);
bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
                         bool InOverloadResolution,
                         QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCPointerConversion(QualType FromType, QualType ToType,
                             QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCWritebackConversion(QualType FromType, QualType ToType,
                               QualType &ConvertedType);
bool IsBlockPointerConversion(QualType FromType, QualType ToType,
                              QualType& ConvertedType);
bool FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
                                const FunctionProtoType *NewType,
                                unsigned *ArgPos = nullptr);
void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
                                QualType FromType, QualType ToType);

void maybeExtendBlockObject(ExprResult &E);
CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
bool CheckPointerConversion(Expr *From, QualType ToType,
                            CastKind &Kind,
                            CXXCastPath& BasePath,
                            bool IgnoreBaseAccess,
                            bool Diagnose = true);
bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
                               bool InOverloadResolution,
                               QualType &ConvertedType);
bool CheckMemberPointerConversion(Expr *From, QualType ToType,
                                  CastKind &Kind,
                                  CXXCastPath &BasePath,
                                  bool IgnoreBaseAccess);
bool IsQualificationConversion(QualType FromType, QualType ToType,
                               bool CStyle, bool &ObjCLifetimeConversion);
bool IsFunctionConversion(QualType FromType, QualType ToType,
                          QualType &ResultTy);
bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
bool isSameOrCompatibleFunctionType(CanQualType Param, CanQualType Arg);

ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
                                           const VarDecl *NRVOCandidate,
                                           QualType ResultType,
                                           Expr *Value,
                                           bool AllowNRVO = true);

bool CanPerformCopyInitialization(const InitializedEntity &Entity,
                                  ExprResult Init);
ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
                                     SourceLocation EqualLoc,
                                     ExprResult Init,
                                     bool TopLevelOfInitList = false,
                                     bool AllowExplicit = false);
ExprResult PerformObjectArgumentInitialization(Expr *From,
                                               NestedNameSpecifier *Qualifier,
                                               NamedDecl *FoundDecl,
                                               CXXMethodDecl *Method);

ExprResult PerformContextuallyConvertToBool(Expr *From);
ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);

/// Contexts in which a converted constant expression is required.
enum CCEKind {
  CCEK_CaseValue,   ///< Expression in a case label.
  CCEK_Enumerator,  ///< Enumerator value with fixed underlying type.
  CCEK_TemplateArg, ///< Value of a non-type template parameter.
  CCEK_NewExpr,     ///< Constant expression in a noptr-new-declarator.
  CCEK_ConstexprIf  ///< Condition in a constexpr if statement.
};
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            llvm::APSInt &Value, CCEKind CCE);
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            APValue &Value, CCEKind CCE);

/// \brief Abstract base class used to perform a contextual implicit
/// conversion from an expression to any type passing a filter.
class ContextualImplicitConverter {
public:
  bool Suppress;
  bool SuppressConversion;

  ContextualImplicitConverter(bool Suppress = false,
                              bool SuppressConversion = false)
      : Suppress(Suppress), SuppressConversion(SuppressConversion) {}

  /// \brief Determine whether the specified type is a valid destination type
  /// for this conversion.
  virtual bool match(QualType T) = 0;

  /// \brief Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a diagnostic when the expression has incomplete class type.
  virtual SemaDiagnosticBuilder
  diagnoseIncomplete(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a diagnostic when the only matching conversion function
  /// is explicit.
  virtual SemaDiagnosticBuilder diagnoseExplicitConv(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  /// \brief Emits a note for the explicit conversion function.
  virtual SemaDiagnosticBuilder
  noteExplicitConv(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// \brief Emits a diagnostic when there are multiple possible conversion
  /// functions.
  virtual SemaDiagnosticBuilder
  diagnoseAmbiguous(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a note for one of the candidate conversions.
  virtual SemaDiagnosticBuilder
  noteAmbiguous(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// \brief Emits a diagnostic when we picked a conversion function
  /// (for cases when we are not allowed to pick a conversion function).
  virtual SemaDiagnosticBuilder diagnoseConversion(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  virtual ~ContextualImplicitConverter() {}
};

class ICEConvertDiagnoser : public ContextualImplicitConverter {
  bool AllowScopedEnumerations;

public:
  ICEConvertDiagnoser(bool AllowScopedEnumerations,
                      bool Suppress, bool SuppressConversion)
      : ContextualImplicitConverter(Suppress, SuppressConversion),
        AllowScopedEnumerations(AllowScopedEnumerations) {}

  /// Match an integral or (possibly scoped) enumeration type.
  bool match(QualType T) override;

  SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) override {
    return diagnoseNotInt(S, Loc, T);
  }

  /// \brief Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNotInt(Sema &S, SourceLocation Loc, QualType T) = 0;
};

/// Perform a contextual implicit conversion.
ExprResult PerformContextualImplicitConversion(
    SourceLocation Loc, Expr *FromE, ContextualImplicitConverter &Converter);


enum ObjCSubscriptKind {
  OS_Array,
  OS_Dictionary,
  OS_Error
};
ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);

// Note that LK_String is intentionally after the other literals, as
// this is used for diagnostics logic.
enum ObjCLiteralKind {
  LK_Array,
  LK_Dictionary,
  LK_Numeric,
  LK_Boxed,
  LK_String,
  LK_Block,
  LK_None
};
ObjCLiteralKind CheckLiteralKind(Expr *FromE);

ExprResult PerformObjectMemberConversion(Expr *From,
                                         NestedNameSpecifier *Qualifier,
                                         NamedDecl *FoundDecl,
                                         NamedDecl *Member);

// Members have to be NamespaceDecl* or TranslationUnitDecl*.
// TODO: make this is a typesafe union.
typedef llvm::SmallSetVector<DeclContext   *, 16> AssociatedNamespaceSet;
typedef llvm::SmallSetVector<CXXRecordDecl *, 16> AssociatedClassSet;

void AddOverloadCandidate(FunctionDecl *Function,
                          DeclAccessPair FoundDecl,
                          ArrayRef<Expr *> Args,
                          OverloadCandidateSet &CandidateSet,
                          bool SuppressUserConversions = false,
                          bool PartialOverloading = false,
                          bool AllowExplicit = false,
                          ConversionSequenceList EarlyConversions = None);
void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
                    ArrayRef<Expr *> Args,
                    OverloadCandidateSet &CandidateSet,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    bool SuppressUserConversions = false,
                    bool PartialOverloading = false,
                    bool FirstArgumentIsBase = false);
void AddMethodCandidate(DeclAccessPair FoundDecl,
                        QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversion = false);
void AddMethodCandidate(CXXMethodDecl *Method,
                        DeclAccessPair FoundDecl,
                        CXXRecordDecl *ActingContext, QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversions = false,
                        bool PartialOverloading = false,
                        ConversionSequenceList EarlyConversions = None);
void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
                                DeclAccessPair FoundDecl,
                                CXXRecordDecl *ActingContext,
                               TemplateArgumentListInfo *ExplicitTemplateArgs,
                                QualType ObjectType,
                                Expr::Classification ObjectClassification,
                                ArrayRef<Expr *> Args,
                                OverloadCandidateSet& CandidateSet,
                                bool SuppressUserConversions = false,
                                bool PartialOverloading = false);
void AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
                                  DeclAccessPair FoundDecl,
                               TemplateArgumentListInfo *ExplicitTemplateArgs,
                                  ArrayRef<Expr *> Args,
                                  OverloadCandidateSet& CandidateSet,
                                  bool SuppressUserConversions = false,
                                  bool PartialOverloading = false);
bool CheckNonDependentConversions(FunctionTemplateDecl *FunctionTemplate,
                                  ArrayRef<QualType> ParamTypes,
                                  ArrayRef<Expr *> Args,
                                  OverloadCandidateSet &CandidateSet,
                                  ConversionSequenceList &Conversions,
                                  bool SuppressUserConversions,
                                  CXXRecordDecl *ActingContext = nullptr,
                                  QualType ObjectType = QualType(),
                                  Expr::Classification
                                      ObjectClassification = {});
void AddConversionCandidate(CXXConversionDecl *Conversion,
                            DeclAccessPair FoundDecl,
                            CXXRecordDecl *ActingContext,
                            Expr *From, QualType ToType,
                            OverloadCandidateSet& CandidateSet,
                            bool AllowObjCConversionOnExplicit,
                            bool AllowResultConversion = true);
void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
                                    DeclAccessPair FoundDecl,
                                    CXXRecordDecl *ActingContext,
                                    Expr *From, QualType ToType,
                                    OverloadCandidateSet &CandidateSet,
                                    bool AllowObjCConversionOnExplicit,
                                    bool AllowResultConversion = true);
void AddSurrogateCandidate(CXXConversionDecl *Conversion,
                           DeclAccessPair FoundDecl,
                           CXXRecordDecl *ActingContext,
                           const FunctionProtoType *Proto,
                           Expr *Object, ArrayRef<Expr *> Args,
                           OverloadCandidateSet& CandidateSet);
void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
                                 SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                 OverloadCandidateSet& CandidateSet,
                                 SourceRange OpRange = SourceRange());
void AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args,
                         OverloadCandidateSet& CandidateSet,
                         bool IsAssignmentOperator = false,
                         unsigned NumContextualBoolArguments = 0);
void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
                                  SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                  OverloadCandidateSet& CandidateSet);
void AddArgumentDependentLookupCandidates(DeclarationName Name,
                                          SourceLocation Loc,
                                          ArrayRef<Expr *> Args,
                              TemplateArgumentListInfo *ExplicitTemplateArgs,
                                          OverloadCandidateSet& CandidateSet,
                                          bool PartialOverloading = false);

// Emit as a 'note' the specific overload candidate
void NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn,
                           QualType DestType = QualType(),
                           bool TakingAddress = false);

// Emit as a series of 'note's all template and non-templates identified by
// the expression Expr
void NoteAllOverloadCandidates(Expr *E, QualType DestType = QualType(),
                               bool TakingAddress = false);

/// Check the enable_if expressions on the given function. Returns the first
/// failing attribute, or NULL if they were all successful.
EnableIfAttr *CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
                            bool MissingImplicitThis = false);

/// Find the failed Boolean condition within a given Boolean
/// constant expression, and describe it with a string.
///
/// \param AllowTopLevelCond Whether to allow the result to be the
/// complete top-level condition.
std::pair<Expr *, std::string>
findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// non-ArgDependent DiagnoseIfAttrs.
///
/// Argument-dependent diagnose_if attributes should be checked each time a
/// function is used as a direct callee of a function call.
///
/// Returns true if any errors were emitted.
bool diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
                                         const Expr *ThisArg,
                                         ArrayRef<const Expr *> Args,
                                         SourceLocation Loc);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// ArgDependent DiagnoseIfAttrs.
///
/// Argument-independent diagnose_if attributes should be checked on every use
/// of a function.
///
/// Returns true if any errors were emitted.
bool diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND,
                                           SourceLocation Loc);

/// Returns whether the given function's address can be taken or not,
/// optionally emitting a diagnostic if the address can't be taken.
///
/// Returns false if taking the address of the function is illegal.
bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function,
                                       bool Complain = false,
                                       SourceLocation Loc = SourceLocation());

// [PossiblyAFunctionType]  -->   [Return]
// NonFunctionType --> NonFunctionType
// R (A) --> R(A)
// R (*)(A) --> R (A)
// R (&)(A) --> R (A)
// R (S::*)(A) --> R (A)
QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);

FunctionDecl *
ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
                                   QualType TargetType,
                                   bool Complain,
                                   DeclAccessPair &Found,
                                   bool *pHadMultipleCandidates = nullptr);

FunctionDecl *
resolveAddressOfOnlyViableOverloadCandidate(Expr *E,
                                            DeclAccessPair &FoundResult);

bool resolveAndFixAddressOfOnlyViableOverloadCandidate(
    ExprResult &SrcExpr, bool DoFunctionPointerConversion = false);

FunctionDecl *
ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
                                            bool Complain = false,
                                            DeclAccessPair *Found = nullptr);

bool ResolveAndFixSingleFunctionTemplateSpecialization(
                    ExprResult &SrcExpr,
                    bool DoFunctionPointerConverion = false,
                    bool Complain = false,
                    SourceRange OpRangeForComplaining = SourceRange(),
                    QualType DestTypeForComplaining = QualType(),
                    unsigned DiagIDForComplaining = 0);


Expr *FixOverloadedFunctionReference(Expr *E,
                                     DeclAccessPair FoundDecl,
                                     FunctionDecl *Fn);
ExprResult FixOverloadedFunctionReference(ExprResult,
                                          DeclAccessPair FoundDecl,
                                          FunctionDecl *Fn);

void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
                                 ArrayRef<Expr *> Args,
                                 OverloadCandidateSet &CandidateSet,
                                 bool PartialOverloading = false);

// An enum used to represent the different possible results of building a
// range-based for loop.
enum ForRangeStatus {
  FRS_Success,
  FRS_NoViableFunction,
  FRS_DiagnosticIssued
};

ForRangeStatus BuildForRangeBeginEndCall(SourceLocation Loc,
                                         SourceLocation RangeLoc,
                                         const DeclarationNameInfo &NameInfo,
                                         LookupResult &MemberLookup,
                                         OverloadCandidateSet *CandidateSet,
                                         Expr *Range, ExprResult *CallExpr);

ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
                                   UnresolvedLookupExpr *ULE,
                                   SourceLocation LParenLoc,
                                   MultiExprArg Args,
                                   SourceLocation RParenLoc,
                                   Expr *ExecConfig,
                                   bool AllowTypoCorrection=true,
                                   bool CalleesAddressIsTaken=false);

bool buildOverloadedCallSet(Scope *S, Expr *Fn, UnresolvedLookupExpr *ULE,
                            MultiExprArg Args, SourceLocation RParenLoc,
                            OverloadCandidateSet *CandidateSet,
                            ExprResult *Result);

ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
                                   UnaryOperatorKind Opc,
                                   const UnresolvedSetImpl &Fns,
                                   Expr *input, bool RequiresADL = true);

ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
                                 BinaryOperatorKind Opc,
                                 const UnresolvedSetImpl &Fns,
                                 Expr *LHS, Expr *RHS,
                                 bool RequiresADL = true);

ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
                                              SourceLocation RLoc,
                                              Expr *Base,Expr *Idx);

ExprResult
BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
                          SourceLocation LParenLoc,
                          MultiExprArg Args,
                          SourceLocation RParenLoc);
ExprResult
BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
                             MultiExprArg Args,
                             SourceLocation RParenLoc);

ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
                                    SourceLocation OpLoc,
                                    bool *NoArrowOperatorFound = nullptr);

/// CheckCallReturnType - Checks that a call expression's return type is
/// complete. Returns true on failure. The location passed in is the location
/// that best represents the call.
bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
                         CallExpr *CE, FunctionDecl *FD);

/// Helpers for dealing with blocks and functions.
bool CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
                              bool CheckParameterNames);
void CheckCXXDefaultArguments(FunctionDecl *FD);
void CheckExtraCXXDefaultArguments(Declarator &D);
Scope *getNonFieldDeclScope(Scope *S);

/// \name Name lookup
///
/// These routines provide name lookup that is used during semantic
/// analysis to resolve the various kinds of names (identifiers,
/// overloaded operator names, constructor names, etc.) into zero or
/// more declarations within a particular scope. The major entry
/// points are LookupName, which performs unqualified name lookup,
/// and LookupQualifiedName, which performs qualified name lookup.
///
/// All name lookup is performed based on some specific criteria,
/// which specify what names will be visible to name lookup and how
/// far name lookup should work. These criteria are important both
/// for capturing language semantics (certain lookups will ignore
/// certain names, for example) and for performance, since name
/// lookup is often a bottleneck in the compilation of C++. Name
/// lookup criteria is specified via the LookupCriteria enumeration.
///
/// The results of name lookup can vary based on the kind of name
/// lookup performed, the current language, and the translation
/// unit. In C, for example, name lookup will either return nothing
/// (no entity found) or a single declaration. In C++, name lookup
/// can additionally refer to a set of overloaded functions or
/// result in an ambiguity. All of the possible results of name
/// lookup are captured by the LookupResult class, which provides
/// the ability to distinguish among them.
//@{

/// @brief Describes the kind of name lookup to perform.
enum LookupNameKind {
  /// Ordinary name lookup, which finds ordinary names (functions,
  /// variables, typedefs, etc.) in C and most kinds of names
  /// (functions, variables, members, types, etc.) in C++.
  LookupOrdinaryName = 0,
  /// Tag name lookup, which finds the names of enums, classes,
  /// structs, and unions.
  LookupTagName,
  /// Label name lookup.
  LookupLabel,
  /// Member name lookup, which finds the names of
  /// class/struct/union members.
  LookupMemberName,
  /// Look up of an operator name (e.g., operator+) for use with
  /// operator overloading. This lookup is similar to ordinary name
  /// lookup, but will ignore any declarations that are class members.
  LookupOperatorName,
  /// Look up of a name that precedes the '::' scope resolution
  /// operator in C++. This lookup completely ignores operator, object,
  /// function, and enumerator names (C++ [basic.lookup.qual]p1).
  LookupNestedNameSpecifierName,
  /// Look up a namespace name within a C++ using directive or
  /// namespace alias definition, ignoring non-namespace names (C++
  /// [basic.lookup.udir]p1).
  LookupNamespaceName,
  /// Look up all declarations in a scope with the given name,
  /// including resolved using declarations.  This is appropriate
  /// for checking redeclarations for a using declaration.
  LookupUsingDeclName,
  /// Look up an ordinary name that is going to be redeclared as a
  /// name with linkage. This lookup ignores any declarations that
  /// are outside of the current scope unless they have linkage. See
  /// C99 6.2.2p4-5 and C++ [basic.link]p6.
  LookupRedeclarationWithLinkage,
  /// Look up a friend of a local class. This lookup does not look
  /// outside the innermost non-class scope. See C++11 [class.friend]p11.
  LookupLocalFriendName,
  /// Look up the name of an Objective-C protocol.
  LookupObjCProtocolName,
  /// Look up implicit 'self' parameter of an objective-c method.
  LookupObjCImplicitSelfParam,
  /// \brief Look up the name of an OpenMP user-defined reduction operation.
  LookupOMPReductionName,
  /// \brief Look up any declaration with any name.
  LookupAnyName
};

/// \brief Specifies whether (or how) name lookup is being performed for a
/// redeclaration (vs. a reference).
enum RedeclarationKind {
  /// \brief The lookup is a reference to this name that is not for the
  /// purpose of redeclaring the name.
  NotForRedeclaration = 0,
  /// \brief The lookup results will be used for redeclaration of a name,
  /// if an entity by that name already exists and is visible.
  ForVisibleRedeclaration,
  /// \brief The lookup results will be used for redeclaration of a name
  /// with external linkage; non-visible lookup results with external linkage
  /// may also be found.
  ForExternalRedeclaration
};

RedeclarationKind forRedeclarationInCurContext() {
  // A declaration with an owning module for linkage can never link against
  // anything that is not visible. We don't need to check linkage here; if
  // the context has internal linkage, redeclaration lookup won't find things
  // from other TUs, and we can't safely compute linkage yet in general.
  if (cast<Decl>(CurContext)
          ->getOwningModuleForLinkage(/*IgnoreLinkage*/true))
    return ForVisibleRedeclaration;
  return ForExternalRedeclaration;
}

/// \brief The possible outcomes of name lookup for a literal operator.
enum LiteralOperatorLookupResult {
  /// \brief The lookup resulted in an error.
  LOLR_Error,
  /// \brief The lookup found no match but no diagnostic was issued.
  LOLR_ErrorNoDiagnostic,
  /// \brief The lookup found a single 'cooked' literal operator, which
  /// expects a normal literal to be built and passed to it.
  LOLR_Cooked,
  /// \brief The lookup found a single 'raw' literal operator, which expects
  /// a string literal containing the spelling of the literal token.
  LOLR_Raw,
  /// \brief The lookup found an overload set of literal operator templates,
  /// which expect the characters of the spelling of the literal token to be
  /// passed as a non-type template argument pack.
  LOLR_Template,
  /// \brief The lookup found an overload set of literal operator templates,
  /// which expect the character type and characters of the spelling of the
  /// string literal token to be passed as template arguments.
  LOLR_StringTemplate
};

SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D,
                                                CXXSpecialMember SM,
                                                bool ConstArg,
                                                bool VolatileArg,
                                                bool RValueThis,
                                                bool ConstThis,
                                                bool VolatileThis);

typedef std::function<void(const TypoCorrection &)> TypoDiagnosticGenerator;
typedef std::function<ExprResult(Sema &, TypoExpr *, TypoCorrection)>
    TypoRecoveryCallback;

3108private:
bool CppLookupName(LookupResult &R, Scope *S);

struct TypoExprState {
  std::unique_ptr<TypoCorrectionConsumer> Consumer;
  TypoDiagnosticGenerator DiagHandler;
  TypoRecoveryCallback RecoveryHandler;
  TypoExprState();
  TypoExprState(TypoExprState &&other) noexcept;
  TypoExprState &operator=(TypoExprState &&other) noexcept;
};

/// \brief The set of unhandled TypoExprs and their associated state.
llvm::MapVector<TypoExpr *, TypoExprState> DelayedTypos;

/// \brief Creates a new TypoExpr AST node.
TypoExpr *createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC,
                            TypoDiagnosticGenerator TDG,
                            TypoRecoveryCallback TRC);

// \brief The set of known/encountered (unique, canonicalized) NamespaceDecls.
//
// The boolean value will be true to indicate that the namespace was loaded
// from an AST/PCH file, or false otherwise.
llvm::MapVector<NamespaceDecl*, bool> KnownNamespaces;

/// \brief Whether we have already loaded known namespaces from an extenal
/// source.
bool LoadedExternalKnownNamespaces;

/// \brief Helper for CorrectTypo and CorrectTypoDelayed used to create and
/// populate a new TypoCorrectionConsumer. Returns nullptr if typo correction
/// should be skipped entirely.
std::unique_ptr<TypoCorrectionConsumer>
makeTypoCorrectionConsumer(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind, Scope *S,
                           CXXScopeSpec *SS,
                           std::unique_ptr<CorrectionCandidateCallback> CCC,
                           DeclContext *MemberContext, bool EnteringContext,
                           const ObjCObjectPointerType *OPT,
                           bool ErrorRecovery);

3150public:
const TypoExprState &getTypoExprState(TypoExpr *TE) const;

/// \brief Clears the state of the given TypoExpr.
void clearDelayedTypo(TypoExpr *TE);

/// \brief Look up a name, looking for a single declaration.  Return
/// null if the results were absent, ambiguous, or overloaded.
///
/// It is preferable to use the elaborated form and explicitly handle
/// ambiguity and overloaded.
NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
                            SourceLocation Loc,
                            LookupNameKind NameKind,
                            RedeclarationKind Redecl
                              = NotForRedeclaration);
bool LookupName(LookupResult &R, Scope *S,
                bool AllowBuiltinCreation = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         bool InUnqualifiedLookup = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         CXXScopeSpec &SS);
bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
                      bool AllowBuiltinCreation = false,
                      bool EnteringContext = false);
ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
                                 RedeclarationKind Redecl
                                   = NotForRedeclaration);
bool LookupInSuper(LookupResult &R, CXXRecordDecl *Class);

void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
                                  QualType T1, QualType T2,
                                  UnresolvedSetImpl &Functions);

LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
                               SourceLocation GnuLabelLoc = SourceLocation());

DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
                                             unsigned Quals);
CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                       bool RValueThis, unsigned ThisQuals);
CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class,
                                            unsigned Quals);
CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                      bool RValueThis, unsigned ThisQuals);
CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);

bool checkLiteralOperatorId(const CXXScopeSpec &SS, const UnqualifiedId &Id);
LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
                                                  ArrayRef<QualType> ArgTys,
                                                  bool AllowRaw,
                                                  bool AllowTemplate,
                                                  bool AllowStringTemplate,
                                                  bool DiagnoseMissing);
bool isKnownName(StringRef name);

void ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc,
                             ArrayRef<Expr *> Args, ADLResult &Functions);

void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool LoadExternal = true);
void LookupVisibleDecls(DeclContext *Ctx, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool IncludeDependentBases = false,
                        bool LoadExternal = true);

enum CorrectTypoKind {
  CTK_NonError,     // CorrectTypo used in a non error recovery situation.
  CTK_ErrorRecovery // CorrectTypo used in normal error recovery.
};

TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind,
                           Scope *S, CXXScopeSpec *SS,
                           std::unique_ptr<CorrectionCandidateCallback> CCC,
                           CorrectTypoKind Mode,
                           DeclContext *MemberContext = nullptr,
                           bool EnteringContext = false,
                           const ObjCObjectPointerType *OPT = nullptr,
                           bool RecordFailure = true);

TypoExpr *CorrectTypoDelayed(const DeclarationNameInfo &Typo,
                             Sema::LookupNameKind LookupKind, Scope *S,
                             CXXScopeSpec *SS,
                             std::unique_ptr<CorrectionCandidateCallback> CCC,
                             TypoDiagnosticGenerator TDG,
                             TypoRecoveryCallback TRC, CorrectTypoKind Mode,
                             DeclContext *MemberContext = nullptr,
                             bool EnteringContext = false,
                             const ObjCObjectPointerType *OPT = nullptr);

/// \brief Process any TypoExprs in the given Expr and its children,
/// generating diagnostics as appropriate and returning a new Expr if there
/// were typos that were all successfully corrected and ExprError if one or
/// more typos could not be corrected.
///
/// \param E The Expr to check for TypoExprs.
///
/// \param InitDecl A VarDecl to avoid because the Expr being corrected is its
/// initializer.
///
/// \param Filter A function applied to a newly rebuilt Expr to determine if
/// it is an acceptable/usable result from a single combination of typo
/// corrections. As long as the filter returns ExprError, different
/// combinations of corrections will be tried until all are exhausted.
ExprResult
CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; });

ExprResult
CorrectDelayedTyposInExpr(Expr *E,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(E, nullptr, Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; }) {
  return ER.isInvalid() ? ER : CorrectDelayedTyposInExpr(ER.get(), Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(ER, nullptr, Filter);
}

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  bool ErrorRecovery = true);

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  const PartialDiagnostic &PrevNote,
                  bool ErrorRecovery = true);

void MarkTypoCorrectedFunctionDefinition(const NamedDecl *F);

void FindAssociatedClassesAndNamespaces(SourceLocation InstantiationLoc,
                                        ArrayRef<Expr *> Args,
                                 AssociatedNamespaceSet &AssociatedNamespaces,
                                 AssociatedClassSet &AssociatedClasses);

void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
                          bool ConsiderLinkage, bool AllowInlineNamespace);

bool CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old);

void DiagnoseAmbiguousLookup(LookupResult &Result);
//@}

ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
                                        SourceLocation IdLoc,
                                        bool TypoCorrection = false);
NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
                               Scope *S, bool ForRedeclaration,
                               SourceLocation Loc);
NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
                                    Scope *S);
void AddKnownFunctionAttributes(FunctionDecl *FD);

// More parsing and symbol table subroutines.

void ProcessPragmaWeak(Scope *S, Decl *D);
// Decl attributes - this routine is the top level dispatcher.
void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD);
// Helper for delayed processing of attributes.
void ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList);
void ProcessDeclAttributeList(Scope *S, Decl *D, const AttributeList *AL,
                              bool IncludeCXX11Attributes = true);
bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
                                    const AttributeList *AttrList);

void checkUnusedDeclAttributes(Declarator &D);

/// Determine if type T is a valid subject for a nonnull and similar
/// attributes. By default, we look through references (the behavior used by
/// nonnull), but if the second parameter is true, then we treat a reference
/// type as valid.
bool isValidPointerAttrType(QualType T, bool RefOkay = false);

bool CheckRegparmAttr(const AttributeList &attr, unsigned &value);
bool CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
                          const FunctionDecl *FD = nullptr);
bool CheckNoReturnAttr(const AttributeList &attr);
bool CheckNoCallerSavedRegsAttr(const AttributeList &attr);
bool checkStringLiteralArgumentAttr(const AttributeList &Attr,
                                    unsigned ArgNum, StringRef &Str,
                                    SourceLocation *ArgLocation = nullptr);
bool checkSectionName(SourceLocation LiteralLoc, StringRef Str);
bool checkTargetAttr(SourceLocation LiteralLoc, StringRef Str);
bool checkMSInheritanceAttrOnDefinition(
    CXXRecordDecl *RD, SourceRange Range, bool BestCase,
    MSInheritanceAttr::Spelling SemanticSpelling);

void CheckAlignasUnderalignment(Decl *D);

/// Adjust the calling convention of a method to be the ABI default if it
/// wasn't specified explicitly.  This handles method types formed from
/// function type typedefs and typename template arguments.
void adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
                            SourceLocation Loc);

// Check if there is an explicit attribute, but only look through parens.
// The intent is to look for an attribute on the current declarator, but not
// one that came from a typedef.
bool hasExplicitCallingConv(QualType &T);

/// Get the outermost AttributedType node that sets a calling convention.
/// Valid types should not have multiple attributes with different CCs.
const AttributedType *getCallingConvAttributedType(QualType T) const;

/// Check whether a nullability type specifier can be added to the given
/// type.
///
/// \param type The type to which the nullability specifier will be
/// added. On success, this type will be updated appropriately.
///
/// \param nullability The nullability specifier to add.
///
/// \param nullabilityLoc The location of the nullability specifier.
///
/// \param isContextSensitive Whether this nullability specifier was
/// written as a context-sensitive keyword (in an Objective-C
/// method) or an Objective-C property attribute, rather than as an
/// underscored type specifier.
///
/// \param allowArrayTypes Whether to accept nullability specifiers on an
/// array type (e.g., because it will decay to a pointer).
///
/// \returns true if nullability cannot be applied, false otherwise.
bool checkNullabilityTypeSpecifier(QualType &type, NullabilityKind nullability,
                                   SourceLocation nullabilityLoc,
                                   bool isContextSensitive,
                                   bool allowArrayTypes);

/// \brief Stmt attributes - this routine is the top level dispatcher.
StmtResult ProcessStmtAttributes(Stmt *Stmt, AttributeList *Attrs,
                                 SourceRange Range);

void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *MethodDecl,
                                 bool IsProtocolMethodDecl);

void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *Overridden,
                                 bool IsProtocolMethodDecl);

/// WarnExactTypedMethods - This routine issues a warning if method
/// implementation declaration matches exactly that of its declaration.
void WarnExactTypedMethods(ObjCMethodDecl *Method,
                           ObjCMethodDecl *MethodDecl,
                           bool IsProtocolMethodDecl);

typedef llvm::SmallPtrSet<Selector, 8> SelectorSet;

/// CheckImplementationIvars - This routine checks if the instance variables
/// listed in the implelementation match those listed in the interface.
void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
                              ObjCIvarDecl **Fields, unsigned nIvars,
                              SourceLocation Loc);

/// ImplMethodsVsClassMethods - This is main routine to warn if any method
/// remains unimplemented in the class or category \@implementation.
void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
                               ObjCContainerDecl* IDecl,
                               bool IncompleteImpl = false);

/// DiagnoseUnimplementedProperties - This routine warns on those properties
/// which must be implemented by this implementation.
void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
                                     ObjCContainerDecl *CDecl,
                                     bool SynthesizeProperties);

/// Diagnose any null-resettable synthesized setters.
void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl);

/// DefaultSynthesizeProperties - This routine default synthesizes all
/// properties which must be synthesized in the class's \@implementation.
void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl,
                                 ObjCInterfaceDecl *IDecl,
                                 SourceLocation AtEnd);
void DefaultSynthesizeProperties(Scope *S, Decl *D, SourceLocation AtEnd);

/// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
/// an ivar synthesized for 'Method' and 'Method' is a property accessor
/// declared in class 'IFace'.
bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace,
                                    ObjCMethodDecl *Method, ObjCIvarDecl *IV);

/// DiagnoseUnusedBackingIvarInAccessor - Issue an 'unused' warning if ivar which
/// backs the property is not used in the property's accessor.
void DiagnoseUnusedBackingIvarInAccessor(Scope *S,
                                         const ObjCImplementationDecl *ImplD);

/// GetIvarBackingPropertyAccessor - If method is a property setter/getter and
/// it property has a backing ivar, returns this ivar; otherwise, returns NULL.
/// It also returns ivar's property on success.
ObjCIvarDecl *GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
                                             const ObjCPropertyDecl *&PDecl) const;

/// Called by ActOnProperty to handle \@property declarations in
/// class extensions.
ObjCPropertyDecl *HandlePropertyInClassExtension(Scope *S,
                    SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD,
                    Selector GetterSel,
                    SourceLocation GetterNameLoc,
                    Selector SetterSel,
                    SourceLocation SetterNameLoc,
                    const bool isReadWrite,
                    unsigned &Attributes,
                    const unsigned AttributesAsWritten,
                    QualType T,
                    TypeSourceInfo *TSI,
                    tok::ObjCKeywordKind MethodImplKind);

/// Called by ActOnProperty and HandlePropertyInClassExtension to
/// handle creating the ObjcPropertyDecl for a category or \@interface.
ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
                                     ObjCContainerDecl *CDecl,
                                     SourceLocation AtLoc,
                                     SourceLocation LParenLoc,
                                     FieldDeclarator &FD,
                                     Selector GetterSel,
                                     SourceLocation GetterNameLoc,
                                     Selector SetterSel,
                                     SourceLocation SetterNameLoc,
                                     const bool isReadWrite,
                                     const unsigned Attributes,
                                     const unsigned AttributesAsWritten,
                                     QualType T,
                                     TypeSourceInfo *TSI,
                                     tok::ObjCKeywordKind MethodImplKind,
                                     DeclContext *lexicalDC = nullptr);

/// AtomicPropertySetterGetterRules - This routine enforces the rule (via
/// warning) when atomic property has one but not the other user-declared
/// setter or getter.
void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
                                     ObjCInterfaceDecl* IDecl);

void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);

void DiagnoseMissingDesignatedInitOverrides(
                                        const ObjCImplementationDecl *ImplD,
                                        const ObjCInterfaceDecl *IFD);

void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);

enum MethodMatchStrategy {
  MMS_loose,
  MMS_strict
};

/// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
/// true, or false, accordingly.
bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
                                const ObjCMethodDecl *PrevMethod,
                                MethodMatchStrategy strategy = MMS_strict);

/// MatchAllMethodDeclarations - Check methods declaraed in interface or
/// or protocol against those declared in their implementations.
void MatchAllMethodDeclarations(const SelectorSet &InsMap,
                                const SelectorSet &ClsMap,
                                SelectorSet &InsMapSeen,
                                SelectorSet &ClsMapSeen,
                                ObjCImplDecl* IMPDecl,
                                ObjCContainerDecl* IDecl,
                                bool &IncompleteImpl,
                                bool ImmediateClass,
                                bool WarnCategoryMethodImpl=false);

/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
/// category matches with those implemented in its primary class and
/// warns each time an exact match is found.
void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);

/// \brief Add the given method to the list of globally-known methods.
void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);

3539private:
/// AddMethodToGlobalPool - Add an instance or factory method to the global
/// pool. See descriptoin of AddInstanceMethodToGlobalPool.
void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);

/// LookupMethodInGlobalPool - Returns the instance or factory method and
/// optionally warns if there are multiple signatures.
ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
                                         bool receiverIdOrClass,
                                         bool instance);

3550public:
/// \brief - Returns instance or factory methods in global method pool for
/// given selector. It checks the desired kind first, if none is found, and
/// parameter checkTheOther is set, it then checks the other kind. If no such
/// method or only one method is found, function returns false; otherwise, it
/// returns true.
bool
CollectMultipleMethodsInGlobalPool(Selector Sel,
                                   SmallVectorImpl<ObjCMethodDecl*>& Methods,
                                   bool InstanceFirst, bool CheckTheOther,
                                   const ObjCObjectType *TypeBound = nullptr);

bool
AreMultipleMethodsInGlobalPool(Selector Sel, ObjCMethodDecl *BestMethod,
                               SourceRange R, bool receiverIdOrClass,
                               SmallVectorImpl<ObjCMethodDecl*>& Methods);

void
DiagnoseMultipleMethodInGlobalPool(SmallVectorImpl<ObjCMethodDecl*> &Methods,
                                   Selector Sel, SourceRange R,
                                   bool receiverIdOrClass);

3572private:
/// \brief - Returns a selector which best matches given argument list or
/// nullptr if none could be found
ObjCMethodDecl *SelectBestMethod(Selector Sel, MultiExprArg Args,
                                 bool IsInstance,
                                 SmallVectorImpl<ObjCMethodDecl*>& Methods);


/// \brief Record the typo correction failure and return an empty correction.
TypoCorrection FailedCorrection(IdentifierInfo *Typo, SourceLocation TypoLoc,
                                bool RecordFailure = true) {
  if (RecordFailure)
    TypoCorrectionFailures[Typo].insert(TypoLoc);
  return TypoCorrection();
}

3588public:
/// AddInstanceMethodToGlobalPool - All instance methods in a translation
/// unit are added to a global pool. This allows us to efficiently associate
/// a selector with a method declaraation for purposes of typechecking
/// messages sent to "id" (where the class of the object is unknown).
void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/true);
}

/// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/false);
}

/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
/// pool.
void AddAnyMethodToGlobalPool(Decl *D);

/// LookupInstanceMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R,
                                                 bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/true);
}

/// LookupFactoryMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupFactoryMethodInGlobalPool(Selector Sel, SourceRange R,
                                                bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/false);
}

const ObjCMethodDecl *SelectorsForTypoCorrection(Selector Sel,
                            QualType ObjectType=QualType());
/// LookupImplementedMethodInGlobalPool - Returns the method which has an
/// implementation.
ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);

/// CollectIvarsToConstructOrDestruct - Collect those ivars which require
/// initialization.
void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
                                SmallVectorImpl<ObjCIvarDecl*> &Ivars);

//===--------------------------------------------------------------------===//
// Statement Parsing Callbacks: SemaStmt.cpp.
3635public:
class FullExprArg {
public:
  FullExprArg() : E(nullptr) { }
  FullExprArg(Sema &actions) : E(nullptr) { }

  ExprResult release() {
    return E;
  }

  Expr *get() const { return E; }

  Expr *operator->() {
    return E;
  }

private:
  // FIXME: No need to make the entire Sema class a friend when it's just
  // Sema::MakeFullExpr that needs access to the constructor below.
  friend class Sema;

  explicit FullExprArg(Expr *expr) : E(expr) {}

  Expr *E;
};

FullExprArg MakeFullExpr(Expr *Arg) {
  return MakeFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation());
}
FullExprArg MakeFullExpr(Expr *Arg, SourceLocation CC) {
  return FullExprArg(ActOnFinishFullExpr(Arg, CC).get());
}
FullExprArg MakeFullDiscardedValueExpr(Expr *Arg) {
  ExprResult FE =
    ActOnFinishFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation(),
                        /*DiscardedValue*/ true);
  return FullExprArg(FE.get());
}

StmtResult ActOnExprStmt(ExprResult Arg);
StmtResult ActOnExprStmtError();

StmtResult ActOnNullStmt(SourceLocation SemiLoc,
                         bool HasLeadingEmptyMacro = false);

void ActOnStartOfCompoundStmt(bool IsStmtExpr);
void ActOnFinishOfCompoundStmt();
StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
                             ArrayRef<Stmt *> Elts, bool isStmtExpr);

/// \brief A RAII object to enter scope of a compound statement.
class CompoundScopeRAII {
public:
  CompoundScopeRAII(Sema &S, bool IsStmtExpr = false) : S(S) {
    S.ActOnStartOfCompoundStmt(IsStmtExpr);
  }

  ~CompoundScopeRAII() {
    S.ActOnFinishOfCompoundStmt();
  }

private:
  Sema &S;
};

/// An RAII helper that pops function a function scope on exit.
struct FunctionScopeRAII {
  Sema &S;
  bool Active;
  FunctionScopeRAII(Sema &S) : S(S), Active(true) {}
  ~FunctionScopeRAII() {
    if (Active)
      S.PopFunctionScopeInfo();
  }
  void disable() { Active = false; }
};

StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
                                 SourceLocation StartLoc,
                                 SourceLocation EndLoc);
void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
StmtResult ActOnForEachLValueExpr(Expr *E);
StmtResult ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
                                 SourceLocation DotDotDotLoc, Expr *RHSVal,
                                 SourceLocation ColonLoc);
void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);

StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
                                    SourceLocation ColonLoc,
                                    Stmt *SubStmt, Scope *CurScope);
StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
                          SourceLocation ColonLoc, Stmt *SubStmt);

StmtResult ActOnAttributedStmt(SourceLocation AttrLoc,
                               ArrayRef<const Attr*> Attrs,
                               Stmt *SubStmt);

class ConditionResult;
StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
                                  Stmt *InitStmt,
                                  ConditionResult Cond);
StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
                                         Stmt *Switch, Stmt *Body);
StmtResult ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
                          Stmt *Body);
StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
                       SourceLocation WhileLoc, SourceLocation CondLParen,
                       Expr *Cond, SourceLocation CondRParen);

StmtResult ActOnForStmt(SourceLocation ForLoc,
                        SourceLocation LParenLoc,
                        Stmt *First,
                        ConditionResult Second,
                        FullExprArg Third,
                        SourceLocation RParenLoc,
                        Stmt *Body);
ExprResult CheckObjCForCollectionOperand(SourceLocation forLoc,
                                         Expr *collection);
StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
                                      Stmt *First, Expr *collection,
                                      SourceLocation RParenLoc);
StmtResult FinishObjCForCollectionStmt(Stmt *ForCollection, Stmt *Body);

enum BuildForRangeKind {
  /// Initial building of a for-range statement.
  BFRK_Build,
  /// Instantiation or recovery rebuild of a for-range statement. Don't
  /// attempt any typo-correction.
  BFRK_Rebuild,
  /// Determining whether a for-range statement could be built. Avoid any
  /// unnecessary or irreversible actions.
  BFRK_Check
};

StmtResult ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                Stmt *LoopVar,
                                SourceLocation ColonLoc, Expr *Collection,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                SourceLocation ColonLoc,
                                Stmt *RangeDecl, Stmt *Begin, Stmt *End,
                                Expr *Cond, Expr *Inc,
                                Stmt *LoopVarDecl,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);

StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
                         SourceLocation LabelLoc,
                         LabelDecl *TheDecl);
StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
                                 SourceLocation StarLoc,
                                 Expr *DestExp);
StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
StmtResult ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope);

void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind, unsigned NumParams);
typedef std::pair<StringRef, QualType> CapturedParamNameType;
void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind,
                              ArrayRef<CapturedParamNameType> Params);
StmtResult ActOnCapturedRegionEnd(Stmt *S);
void ActOnCapturedRegionError();
RecordDecl *CreateCapturedStmtRecordDecl(CapturedDecl *&CD,
                                         SourceLocation Loc,
                                         unsigned NumParams);
VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
                                 bool AllowParamOrMoveConstructible);
bool isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
                            bool AllowParamOrMoveConstructible);

StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
                           Scope *CurScope);
StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);

StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
                           bool IsVolatile, unsigned NumOutputs,
                           unsigned NumInputs, IdentifierInfo **Names,
                           MultiExprArg Constraints, MultiExprArg Exprs,
                           Expr *AsmString, MultiExprArg Clobbers,
                           SourceLocation RParenLoc);

void FillInlineAsmIdentifierInfo(Expr *Res,
                                 llvm::InlineAsmIdentifierInfo &Info);
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                                     UnqualifiedId &Id,
                                     bool IsUnevaluatedContext);
bool LookupInlineAsmField(StringRef Base, StringRef Member,
                          unsigned &Offset, SourceLocation AsmLoc);
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member,
                                       SourceLocation AsmLoc);
StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
                          ArrayRef<Token> AsmToks,
                          StringRef AsmString,
                          unsigned NumOutputs, unsigned NumInputs,
                          ArrayRef<StringRef> Constraints,
                          ArrayRef<StringRef> Clobbers,
                          ArrayRef<Expr*> Exprs,
                          SourceLocation EndLoc);
LabelDecl *GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
                                 SourceLocation Location,
                                 bool AlwaysCreate);

VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
                                SourceLocation StartLoc,
                                SourceLocation IdLoc, IdentifierInfo *Id,
                                bool Invalid = false);

Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);

StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
                                Decl *Parm, Stmt *Body);

StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);

StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
                              MultiStmtArg Catch, Stmt *Finally);

StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
                                Scope *CurScope);
ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
                                          Expr *operand);
StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
                                       Expr *SynchExpr,
                                       Stmt *SynchBody);

StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);

VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
                                   SourceLocation StartLoc,
                                   SourceLocation IdLoc,
                                   IdentifierInfo *Id);

Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);

StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
                              Decl *ExDecl, Stmt *HandlerBlock);
StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
                            ArrayRef<Stmt *> Handlers);

StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
                            SourceLocation TryLoc, Stmt *TryBlock,
                            Stmt *Handler);
StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
                               Expr *FilterExpr,
                               Stmt *Block);
void ActOnStartSEHFinallyBlock();
void ActOnAbortSEHFinallyBlock();
StmtResult ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block);
StmtResult ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope);

void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);

bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;

/// \brief If it's a file scoped decl that must warn if not used, keep track
/// of it.
void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);

/// DiagnoseUnusedExprResult - If the statement passed in is an expression
/// whose result is unused, warn.
void DiagnoseUnusedExprResult(const Stmt *S);
void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
void DiagnoseUnusedDecl(const NamedDecl *ND);

/// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
/// statement as a \p Body, and it is located on the same line.
///
/// This helps prevent bugs due to typos, such as:
///     if (condition);
///       do_stuff();
void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
                           const Stmt *Body,
                           unsigned DiagID);

/// Warn if a for/while loop statement \p S, which is followed by
/// \p PossibleBody, has a suspicious null statement as a body.
void DiagnoseEmptyLoopBody(const Stmt *S,
                           const Stmt *PossibleBody);

/// Warn if a value is moved to itself.
void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
                      SourceLocation OpLoc);

/// \brief Warn if we're implicitly casting from a _Nullable pointer type to a
/// _Nonnull one.
void diagnoseNullableToNonnullConversion(QualType DstType, QualType SrcType,
                                         SourceLocation Loc);

/// Warn when implicitly casting 0 to nullptr.
void diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E);

ParsingDeclState PushParsingDeclaration(sema::DelayedDiagnosticPool &pool) {
  return DelayedDiagnostics.push(pool);
}
void PopParsingDeclaration(ParsingDeclState state, Decl *decl);

typedef ProcessingContextState ParsingClassState;
ParsingClassState PushParsingClass() {
  return DelayedDiagnostics.pushUndelayed();
}
void PopParsingClass(ParsingClassState state) {
  DelayedDiagnostics.popUndelayed(state);
}

void redelayDiagnostics(sema::DelayedDiagnosticPool &pool);

void DiagnoseAvailabilityOfDecl(NamedDecl *D, SourceLocation Loc,
                                const ObjCInterfaceDecl *UnknownObjCClass,
                                bool ObjCPropertyAccess,
                                bool AvoidPartialAvailabilityChecks = false);

bool makeUnavailableInSystemHeader(SourceLocation loc,
                                   UnavailableAttr::ImplicitReason reason);

/// \brief Issue any -Wunguarded-availability warnings in \c FD
void DiagnoseUnguardedAvailabilityViolations(Decl *FD);

//===--------------------------------------------------------------------===//
// Expression Parsing Callbacks: SemaExpr.cpp.

bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid);
bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
                       const ObjCInterfaceDecl *UnknownObjCClass = nullptr,
                       bool ObjCPropertyAccess = false,
                       bool AvoidPartialAvailabilityChecks = false);
void NoteDeletedFunction(FunctionDecl *FD);
void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD);
std::string getDeletedOrUnavailableSuffix(const FunctionDecl *FD);
bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
                                      ObjCMethodDecl *Getter,
                                      SourceLocation Loc);
void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
                           ArrayRef<Expr *> Args);

void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                     Decl *LambdaContextDecl = nullptr,
                                     bool IsDecltype = false);
enum ReuseLambdaContextDecl_t { ReuseLambdaContextDecl };
void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                     ReuseLambdaContextDecl_t,
                                     bool IsDecltype = false);
void PopExpressionEvaluationContext();

void DiscardCleanupsInEvaluationContext();

ExprResult TransformToPotentiallyEvaluated(Expr *E);
ExprResult HandleExprEvaluationContextForTypeof(Expr *E);

ExprResult ActOnConstantExpression(ExprResult Res);

// Functions for marking a declaration referenced.  These functions also
// contain the relevant logic for marking if a reference to a function or
// variable is an odr-use (in the C++11 sense).  There are separate variants
// for expressions referring to a decl; these exist because odr-use marking
// needs to be delayed for some constant variables when we build one of the
// named expressions.
//
// MightBeOdrUse indicates whether the use could possibly be an odr-use, and
// should usually be true. This only needs to be set to false if the lack of
// odr-use cannot be determined from the current context (for instance,
// because the name denotes a virtual function and was written without an
// explicit nested-name-specifier).
void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse);
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
                            bool MightBeOdrUse = true);
void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base = nullptr);
void MarkMemberReferenced(MemberExpr *E);

void UpdateMarkingForLValueToRValue(Expr *E);
void CleanupVarDeclMarking();

enum TryCaptureKind {
  TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
};

/// \brief Try to capture the given variable.
///
/// \param Var The variable to capture.
///
/// \param Loc The location at which the capture occurs.
///
/// \param Kind The kind of capture, which may be implicit (for either a
/// block or a lambda), or explicit by-value or by-reference (for a lambda).
///
/// \param EllipsisLoc The location of the ellipsis, if one is provided in
/// an explicit lambda capture.
///
/// \param BuildAndDiagnose Whether we are actually supposed to add the
/// captures or diagnose errors. If false, this routine merely check whether
/// the capture can occur without performing the capture itself or complaining
/// if the variable cannot be captured.
///
/// \param CaptureType Will be set to the type of the field used to capture
/// this variable in the innermost block or lambda. Only valid when the
/// variable can be captured.
///
/// \param DeclRefType Will be set to the type of a reference to the capture
/// from within the current scope. Only valid when the variable can be
/// captured.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// variables that may or may not be used in certain specializations of
/// a nested generic lambda.
///
/// \returns true if an error occurred (i.e., the variable cannot be
/// captured) and false if the capture succeeded.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
                        SourceLocation EllipsisLoc, bool BuildAndDiagnose,
                        QualType &CaptureType,
                        QualType &DeclRefType,
                        const unsigned *const FunctionScopeIndexToStopAt);

/// \brief Try to capture the given variable.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
                        TryCaptureKind Kind = TryCapture_Implicit,
                        SourceLocation EllipsisLoc = SourceLocation());

/// \brief Checks if the variable must be captured.
bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);

/// \brief Given a variable, determine the type that a reference to that
/// variable will have in the given scope.
QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);

/// Mark all of the declarations referenced within a particular AST node as
/// referenced. Used when template instantiation instantiates a non-dependent
/// type -- entities referenced by the type are now referenced.
void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
void MarkDeclarationsReferencedInExpr(Expr *E,
                                      bool SkipLocalVariables = false);

/// \brief Try to recover by turning the given expression into a
/// call.  Returns true if recovery was attempted or an error was
/// emitted; this may also leave the ExprResult invalid.
bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
                          bool ForceComplain = false,
                          bool (*IsPlausibleResult)(QualType) = nullptr);

/// \brief Figure out if an expression could be turned into a call.
bool tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
                   UnresolvedSetImpl &NonTemplateOverloads);

/// \brief Conditionally issue a diagnostic based on the current
/// evaluation context.
///
/// \param Statement If Statement is non-null, delay reporting the
/// diagnostic until the function body is parsed, and then do a basic
/// reachability analysis to determine if the statement is reachable.
/// If it is unreachable, the diagnostic will not be emitted.
bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
                         const PartialDiagnostic &PD);

// Primary Expressions.
SourceRange getExprRange(Expr *E) const;

ExprResult ActOnIdExpression(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand,
    std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr,
    bool IsInlineAsmIdentifier = false, Token *KeywordReplacement = nullptr);

void DecomposeUnqualifiedId(const UnqualifiedId &Id,
                            TemplateArgumentListInfo &Buffer,
                            DeclarationNameInfo &NameInfo,
                            const TemplateArgumentListInfo *&TemplateArgs);

bool
DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
                    std::unique_ptr<CorrectionCandidateCallback> CCC,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    ArrayRef<Expr *> Args = None, TypoExpr **Out = nullptr);

ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
                              IdentifierInfo *II,
                              bool AllowBuiltinCreation=false);

ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
                                      SourceLocation TemplateKWLoc,
                                      const DeclarationNameInfo &NameInfo,
                                      bool isAddressOfOperand,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
                            ExprValueKind VK,
                            SourceLocation Loc,
                            const CXXScopeSpec *SS = nullptr);
ExprResult
BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
                 const DeclarationNameInfo &NameInfo,
                 const CXXScopeSpec *SS = nullptr,
                 NamedDecl *FoundD = nullptr,
                 const TemplateArgumentListInfo *TemplateArgs = nullptr);
ExprResult
BuildAnonymousStructUnionMemberReference(
    const CXXScopeSpec &SS,
    SourceLocation nameLoc,
    IndirectFieldDecl *indirectField,
    DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_none),
    Expr *baseObjectExpr = nullptr,
    SourceLocation opLoc = SourceLocation());

ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
                                           SourceLocation TemplateKWLoc,
                                           LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                           const Scope *S);
ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
                                   SourceLocation TemplateKWLoc,
                                   LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                   bool IsDefiniteInstance,
                                   const Scope *S);
bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
                                const LookupResult &R,
                                bool HasTrailingLParen);

ExprResult
BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
                                  const DeclarationNameInfo &NameInfo,
                                  bool IsAddressOfOperand, const Scope *S,
                                  TypeSourceInfo **RecoveryTSI = nullptr);

ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                              const DeclarationNameInfo &NameInfo,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                    LookupResult &R,
                                    bool NeedsADL,
                                    bool AcceptInvalidDecl = false);
ExprResult BuildDeclarationNameExpr(
    const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
    NamedDecl *FoundD = nullptr,
    const TemplateArgumentListInfo *TemplateArgs = nullptr,
    bool AcceptInvalidDecl = false);

ExprResult BuildLiteralOperatorCall(LookupResult &R,
                    DeclarationNameInfo &SuffixInfo,
                    ArrayRef<Expr *> Args,
                    SourceLocation LitEndLoc,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr);

ExprResult BuildPredefinedExpr(SourceLocation Loc,
                               PredefinedExpr::IdentType IT);
ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);

bool CheckLoopHintExpr(Expr *E, SourceLocation Loc);

ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = nullptr);
ExprResult ActOnCharacterConstant(const Token &Tok,
                                  Scope *UDLScope = nullptr);
ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
ExprResult ActOnParenListExpr(SourceLocation L,
                              SourceLocation R,
                              MultiExprArg Val);

/// ActOnStringLiteral - The specified tokens were lexed as pasted string
/// fragments (e.g. "foo" "bar" L"baz").
ExprResult ActOnStringLiteral(ArrayRef<Token> StringToks,
                              Scope *UDLScope = nullptr);

ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
                                     SourceLocation DefaultLoc,
                                     SourceLocation RParenLoc,
                                     Expr *ControllingExpr,
                                     ArrayRef<ParsedType> ArgTypes,
                                     ArrayRef<Expr *> ArgExprs);
ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
                                      SourceLocation DefaultLoc,
                                      SourceLocation RParenLoc,
                                      Expr *ControllingExpr,
                                      ArrayRef<TypeSourceInfo *> Types,
                                      ArrayRef<Expr *> Exprs);

// Binary/Unary Operators.  'Tok' is the token for the operator.
ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
                                Expr *InputExpr);
ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
                        UnaryOperatorKind Opc, Expr *Input);
ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
                        tok::TokenKind Op, Expr *Input);

QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc);

ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
                                          SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind,
                                          SourceRange R);
ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind);
ExprResult
  ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
                                UnaryExprOrTypeTrait ExprKind,
                                bool IsType, void *TyOrEx,
                                SourceRange ArgRange);

ExprResult CheckPlaceholderExpr(Expr *E);
bool CheckVecStepExpr(Expr *E);

bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
                                      SourceRange ExprRange,
                                      UnaryExprOrTypeTrait ExprKind);
ExprResult ActOnSizeofParameterPackExpr(Scope *S,
                                        SourceLocation OpLoc,
                                        IdentifierInfo &Name,
                                        SourceLocation NameLoc,
                                        SourceLocation RParenLoc);
ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
                               tok::TokenKind Kind, Expr *Input);

ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
                                   Expr *Idx, SourceLocation RLoc);
ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
                                           Expr *Idx, SourceLocation RLoc);
ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
                                    Expr *LowerBound, SourceLocation ColonLoc,
                                    Expr *Length, SourceLocation RBLoc);

// This struct is for use by ActOnMemberAccess to allow
// BuildMemberReferenceExpr to be able to reinvoke ActOnMemberAccess after
// changing the access operator from a '.' to a '->' (to see if that is the
// change needed to fix an error about an unknown member, e.g. when the class
// defines a custom operator->).
struct ActOnMemberAccessExtraArgs {
  Scope *S;
  UnqualifiedId &Id;
  Decl *ObjCImpDecl;
};

ExprResult BuildMemberReferenceExpr(
    Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow,
    CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo,
    const TemplateArgumentListInfo *TemplateArgs,
    const Scope *S,
    ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult
BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc,
                         bool IsArrow, const CXXScopeSpec &SS,
                         SourceLocation TemplateKWLoc,
                         NamedDecl *FirstQualifierInScope, LookupResult &R,
                         const TemplateArgumentListInfo *TemplateArgs,
                         const Scope *S,
                         bool SuppressQualifierCheck = false,
                         ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
                                   SourceLocation OpLoc,
                                   const CXXScopeSpec &SS, FieldDecl *Field,
                                   DeclAccessPair FoundDecl,
                                   const DeclarationNameInfo &MemberNameInfo);

ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);

bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
                                   const CXXScopeSpec &SS,
                                   const LookupResult &R);

ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
                                    bool IsArrow, SourceLocation OpLoc,
                                    const CXXScopeSpec &SS,
                                    SourceLocation TemplateKWLoc,
                                    NamedDecl *FirstQualifierInScope,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
                                 SourceLocation OpLoc,
                                 tok::TokenKind OpKind,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 UnqualifiedId &Member,
                                 Decl *ObjCImpDecl);

void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
                             FunctionDecl *FDecl,
                             const FunctionProtoType *Proto,
                             ArrayRef<Expr *> Args,
                             SourceLocation RParenLoc,
                             bool ExecConfig = false);
void CheckStaticArrayArgument(SourceLocation CallLoc,
                              ParmVarDecl *Param,
                              const Expr *ArgExpr);

/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
/// This provides the location of the left/right parens and a list of comma
/// locations.
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
                         MultiExprArg ArgExprs, SourceLocation RParenLoc,
                         Expr *ExecConfig = nullptr,
                         bool IsExecConfig = false);
ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
                                 SourceLocation LParenLoc,
                                 ArrayRef<Expr *> Arg,
                                 SourceLocation RParenLoc,
                                 Expr *Config = nullptr,
                                 bool IsExecConfig = false);

ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
                                   MultiExprArg ExecConfig,
                                   SourceLocation GGGLoc);

ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
                         Declarator &D, ParsedType &Ty,
                         SourceLocation RParenLoc, Expr *CastExpr);
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
                               TypeSourceInfo *Ty,
                               SourceLocation RParenLoc,
                               Expr *Op);
CastKind PrepareScalarCast(ExprResult &src, QualType destType);

/// \brief Build an altivec or OpenCL literal.
ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
                              SourceLocation RParenLoc, Expr *E,
                              TypeSourceInfo *TInfo);

ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);

ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
                                ParsedType Ty,
                                SourceLocation RParenLoc,
                                Expr *InitExpr);

ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
                                    TypeSourceInfo *TInfo,
                                    SourceLocation RParenLoc,
                                    Expr *LiteralExpr);

ExprResult ActOnInitList(SourceLocation LBraceLoc,
                         MultiExprArg InitArgList,
                         SourceLocation RBraceLoc);

ExprResult ActOnDesignatedInitializer(Designation &Desig,
                                      SourceLocation Loc,
                                      bool GNUSyntax,
                                      ExprResult Init);

4396private:
static BinaryOperatorKind ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind);

4399public:
ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
                      tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
                      BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
                              Expr *LHSExpr, Expr *RHSExpr);

void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc);

/// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
/// in the case of a the GNU conditional expr extension.
ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
                              SourceLocation ColonLoc,
                              Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);

/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
                          LabelDecl *TheDecl);

void ActOnStartStmtExpr();
ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
                         SourceLocation RPLoc); // "({..})"
void ActOnStmtExprError();

// __builtin_offsetof(type, identifier(.identifier|[expr])*)
struct OffsetOfComponent {
  SourceLocation LocStart, LocEnd;
  bool isBrackets;  // true if [expr], false if .ident
  union {
    IdentifierInfo *IdentInfo;
    Expr *E;
  } U;
};

/// __builtin_offsetof(type, a.b[123][456].c)
ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
                                TypeSourceInfo *TInfo,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);
ExprResult ActOnBuiltinOffsetOf(Scope *S,
                                SourceLocation BuiltinLoc,
                                SourceLocation TypeLoc,
                                ParsedType ParsedArgTy,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);

// __builtin_choose_expr(constExpr, expr1, expr2)
ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
                           Expr *CondExpr, Expr *LHSExpr,
                           Expr *RHSExpr, SourceLocation RPLoc);

// __builtin_va_arg(expr, type)
ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
                      SourceLocation RPLoc);
ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
                          TypeSourceInfo *TInfo, SourceLocation RPLoc);

// __null
ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);

bool CheckCaseExpression(Expr *E);

/// \brief Describes the result of an "if-exists" condition check.
enum IfExistsResult {
  /// \brief The symbol exists.
  IER_Exists,

  /// \brief The symbol does not exist.
  IER_DoesNotExist,

  /// \brief The name is a dependent name, so the results will differ
  /// from one instantiation to the next.
  IER_Dependent,

  /// \brief An error occurred.
  IER_Error
};

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
                             const DeclarationNameInfo &TargetNameInfo);

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
                             bool IsIfExists, CXXScopeSpec &SS,
                             UnqualifiedId &Name);

StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      NestedNameSpecifierLoc QualifierLoc,
                                      DeclarationNameInfo NameInfo,
                                      Stmt *Nested);
StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      CXXScopeSpec &SS, UnqualifiedId &Name,
                                      Stmt *Nested);

//===------------------------- "Block" Extension ------------------------===//

/// ActOnBlockStart - This callback is invoked when a block literal is
/// started.
void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockArguments - This callback allows processing of block arguments.
/// If there are no arguments, this is still invoked.
void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
                         Scope *CurScope);

/// ActOnBlockError - If there is an error parsing a block, this callback
/// is invoked to pop the information about the block from the action impl.
void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockStmtExpr - This is called when the body of a block statement
/// literal was successfully completed.  ^(int x){...}
ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
                              Scope *CurScope);

//===---------------------------- Clang Extensions ----------------------===//

/// __builtin_convertvector(...)
ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
                                  SourceLocation BuiltinLoc,
                                  SourceLocation RParenLoc);

//===---------------------------- OpenCL Features -----------------------===//

/// __builtin_astype(...)
ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
                           SourceLocation BuiltinLoc,
                           SourceLocation RParenLoc);

//===---------------------------- C++ Features --------------------------===//

// Act on C++ namespaces
Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
                             SourceLocation NamespaceLoc,
                             SourceLocation IdentLoc,
                             IdentifierInfo *Ident,
                             SourceLocation LBrace,
                             AttributeList *AttrList,
                             UsingDirectiveDecl * &UsingDecl);
void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);

NamespaceDecl *getStdNamespace() const;
NamespaceDecl *getOrCreateStdNamespace();

NamespaceDecl *lookupStdExperimentalNamespace();

CXXRecordDecl *getStdBadAlloc() const;
EnumDecl *getStdAlignValT() const;

/// \brief Tests whether Ty is an instance of std::initializer_list and, if
/// it is and Element is not NULL, assigns the element type to Element.
bool isStdInitializerList(QualType Ty, QualType *Element);

/// \brief Looks for the std::initializer_list template and instantiates it
/// with Element, or emits an error if it's not found.
///
/// \returns The instantiated template, or null on error.
QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);

/// \brief Determine whether Ctor is an initializer-list constructor, as
/// defined in [dcl.init.list]p2.
bool isInitListConstructor(const FunctionDecl *Ctor);

Decl *ActOnUsingDirective(Scope *CurScope,
                          SourceLocation UsingLoc,
                          SourceLocation NamespcLoc,
                          CXXScopeSpec &SS,
                          SourceLocation IdentLoc,
                          IdentifierInfo *NamespcName,
                          AttributeList *AttrList);

void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);

Decl *ActOnNamespaceAliasDef(Scope *CurScope,
                             SourceLocation NamespaceLoc,
                             SourceLocation AliasLoc,
                             IdentifierInfo *Alias,
                             CXXScopeSpec &SS,
                             SourceLocation IdentLoc,
                             IdentifierInfo *Ident);

void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
                          const LookupResult &PreviousDecls,
                          UsingShadowDecl *&PrevShadow);
UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
                                      NamedDecl *Target,
                                      UsingShadowDecl *PrevDecl);

bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
                                 bool HasTypenameKeyword,
                                 const CXXScopeSpec &SS,
                                 SourceLocation NameLoc,
                                 const LookupResult &Previous);
bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
                             bool HasTypename,
                             const CXXScopeSpec &SS,
                             const DeclarationNameInfo &NameInfo,
                             SourceLocation NameLoc);

NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
                                 SourceLocation UsingLoc,
                                 bool HasTypenameKeyword,
                                 SourceLocation TypenameLoc,
                                 CXXScopeSpec &SS,
                                 DeclarationNameInfo NameInfo,
                                 SourceLocation EllipsisLoc,
                                 AttributeList *AttrList,
                                 bool IsInstantiation);
NamedDecl *BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
                              ArrayRef<NamedDecl *> Expansions);

bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);

/// Given a derived-class using shadow declaration for a constructor and the
/// correspnding base class constructor, find or create the implicit
/// synthesized derived class constructor to use for this initialization.
CXXConstructorDecl *
findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor,
                          ConstructorUsingShadowDecl *DerivedShadow);

Decl *ActOnUsingDeclaration(Scope *CurScope,
                            AccessSpecifier AS,
                            SourceLocation UsingLoc,
                            SourceLocation TypenameLoc,
                            CXXScopeSpec &SS,
                            UnqualifiedId &Name,
                            SourceLocation EllipsisLoc,
                            AttributeList *AttrList);
Decl *ActOnAliasDeclaration(Scope *CurScope,
                            AccessSpecifier AS,
                            MultiTemplateParamsArg TemplateParams,
                            SourceLocation UsingLoc,
                            UnqualifiedId &Name,
                            AttributeList *AttrList,
                            TypeResult Type,
                            Decl *DeclFromDeclSpec);

/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
///
/// \param ConstructKind - a CXXConstructExpr::ConstructionKind
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

/// Build a CXXConstructExpr whose constructor has already been resolved if
/// it denotes an inherited constructor.
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

// FIXME: Can we remove this and have the above BuildCXXConstructExpr check if
// the constructor can be elidable?
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs, bool HadMultipleCandidates,
                      bool IsListInitialization,
                      bool IsStdInitListInitialization, bool RequiresZeroInit,
                      unsigned ConstructKind, SourceRange ParenRange);

ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field);


/// Instantiate or parse a C++ default argument expression as necessary.
/// Return true on error.
bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
                            ParmVarDecl *Param);

/// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
/// the default expr if needed.
ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
                                  FunctionDecl *FD,
                                  ParmVarDecl *Param);

/// FinalizeVarWithDestructor - Prepare for calling destructor on the
/// constructed variable.
void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);

/// \brief Helper class that collects exception specifications for
/// implicitly-declared special member functions.
class ImplicitExceptionSpecification {
  // Pointer to allow copying
  Sema *Self;
  // We order exception specifications thus:
  // noexcept is the most restrictive, but is only used in C++11.
  // throw() comes next.
  // Then a throw(collected exceptions)
  // Finally no specification, which is expressed as noexcept(false).
  // throw(...) is used instead if any called function uses it.
  ExceptionSpecificationType ComputedEST;
  llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
  SmallVector<QualType, 4> Exceptions;

  void ClearExceptions() {
    ExceptionsSeen.clear();
    Exceptions.clear();
  }

public:
  explicit ImplicitExceptionSpecification(Sema &Self)
    : Self(&Self), ComputedEST(EST_BasicNoexcept) {
    if (!Self.getLangOpts().CPlusPlus11)
      ComputedEST = EST_DynamicNone;
  }

  /// \brief Get the computed exception specification type.
  ExceptionSpecificationType getExceptionSpecType() const {
    assert(ComputedEST != EST_ComputedNoexcept &&(static_cast <bool> (ComputedEST != EST_ComputedNoexcept
 && "noexcept(expr) should not be a possible result")
 ? void (0) : __assert_fail ("ComputedEST != EST_ComputedNoexcept && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 4723, __extension__ __PRETTY_FUNCTION__))
           "noexcept(expr) should not be a possible result")(static_cast <bool> (ComputedEST != EST_ComputedNoexcept
 && "noexcept(expr) should not be a possible result")
 ? void (0) : __assert_fail ("ComputedEST != EST_ComputedNoexcept && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 4723, __extension__ __PRETTY_FUNCTION__));
    return ComputedEST;
  }

  /// \brief The number of exceptions in the exception specification.
  unsigned size() const { return Exceptions.size(); }

  /// \brief The set of exceptions in the exception specification.
  const QualType *data() const { return Exceptions.data(); }

  /// \brief Integrate another called method into the collected data.
  void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method);

  /// \brief Integrate an invoked expression into the collected data.
  void CalledExpr(Expr *E);

  /// \brief Overwrite an EPI's exception specification with this
  /// computed exception specification.
  FunctionProtoType::ExceptionSpecInfo getExceptionSpec() const {
    FunctionProtoType::ExceptionSpecInfo ESI;
    ESI.Type = getExceptionSpecType();
    if (ESI.Type == EST_Dynamic) {
      ESI.Exceptions = Exceptions;
    } else if (ESI.Type == EST_None) {
      /// C++11 [except.spec]p14:
      ///   The exception-specification is noexcept(false) if the set of
      ///   potential exceptions of the special member function contains "any"
      ESI.Type = EST_ComputedNoexcept;
      ESI.NoexceptExpr = Self->ActOnCXXBoolLiteral(SourceLocation(),
                                                   tok::kw_false).get();
    }
    return ESI;
  }
};

/// \brief Determine what sort of exception specification a defaulted
/// copy constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
                                         CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted
/// default constructor of a class will have, and whether the parameter
/// will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defautled
/// copy assignment operator of a class will have, and whether the
/// parameter will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted move
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted move
/// assignment operator of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted
/// destructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification an inheriting
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
                                   CXXConstructorDecl *CD);

/// \brief Evaluate the implicit exception specification for a defaulted
/// special member function.
void EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD);

/// \brief Check the given exception-specification and update the
/// exception specification information with the results.
void checkExceptionSpecification(bool IsTopLevel,
                                 ExceptionSpecificationType EST,
                                 ArrayRef<ParsedType> DynamicExceptions,
                                 ArrayRef<SourceRange> DynamicExceptionRanges,
                                 Expr *NoexceptExpr,
                                 SmallVectorImpl<QualType> &Exceptions,
                                 FunctionProtoType::ExceptionSpecInfo &ESI);

/// \brief Determine if we're in a case where we need to (incorrectly) eagerly
/// parse an exception specification to work around a libstdc++ bug.
bool isLibstdcxxEagerExceptionSpecHack(const Declarator &D);

/// \brief Add an exception-specification to the given member function
/// (or member function template). The exception-specification was parsed
/// after the method itself was declared.
void actOnDelayedExceptionSpecification(Decl *Method,
       ExceptionSpecificationType EST,
       SourceRange SpecificationRange,
       ArrayRef<ParsedType> DynamicExceptions,
       ArrayRef<SourceRange> DynamicExceptionRanges,
       Expr *NoexceptExpr);

class InheritedConstructorInfo;

/// \brief Determine if a special member function should have a deleted
/// definition when it is defaulted.
bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
                               InheritedConstructorInfo *ICI = nullptr,
                               bool Diagnose = false);

/// \brief Declare the implicit default constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// default constructor will be added.
///
/// \returns The implicitly-declared default constructor.
CXXConstructorDecl *DeclareImplicitDefaultConstructor(
                                                   CXXRecordDecl *ClassDecl);

/// DefineImplicitDefaultConstructor - Checks for feasibility of
/// defining this constructor as the default constructor.
void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
                                      CXXConstructorDecl *Constructor);

/// \brief Declare the implicit destructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// destructor will be added.
///
/// \returns The implicitly-declared destructor.
CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitDestructor - Checks for feasibility of
/// defining this destructor as the default destructor.
void DefineImplicitDestructor(SourceLocation CurrentLocation,
                              CXXDestructorDecl *Destructor);

/// \brief Build an exception spec for destructors that don't have one.
///
/// C++11 says that user-defined destructors with no exception spec get one
/// that looks as if the destructor was implicitly declared.
void AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
                                   CXXDestructorDecl *Destructor);

/// \brief Define the specified inheriting constructor.
void DefineInheritingConstructor(SourceLocation UseLoc,
                                 CXXConstructorDecl *Constructor);

/// \brief Declare the implicit copy constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy constructor will be added.
///
/// \returns The implicitly-declared copy constructor.
CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitCopyConstructor - Checks for feasibility of
/// defining this constructor as the copy constructor.
void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// \brief Declare the implicit move constructor for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move constructor will be added.
///
/// \returns The implicitly-declared move constructor, or NULL if it wasn't
/// declared.
CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitMoveConstructor - Checks for feasibility of
/// defining this constructor as the move constructor.
void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// \brief Declare the implicit copy assignment operator for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy assignment operator will be added.
///
/// \returns The implicitly-declared copy assignment operator.
CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);

/// \brief Defines an implicitly-declared copy assignment operator.
void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// \brief Declare the implicit move assignment operator for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move assignment operator will be added.
///
/// \returns The implicitly-declared move assignment operator, or NULL if it
/// wasn't declared.
CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);

/// \brief Defines an implicitly-declared move assignment operator.
void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// \brief Force the declaration of any implicitly-declared members of this
/// class.
void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);

/// \brief Check a completed declaration of an implicit special member.
void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD);

/// \brief Determine whether the given function is an implicitly-deleted
/// special member function.
bool isImplicitlyDeleted(FunctionDecl *FD);

/// \brief Check whether 'this' shows up in the type of a static member
/// function after the (naturally empty) cv-qualifier-seq would be.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);

/// \brief Whether this' shows up in the exception specification of a static
/// member function.
bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);

/// \brief Check whether 'this' shows up in the attributes of the given
/// static member function.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);

/// MaybeBindToTemporary - If the passed in expression has a record type with
/// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
/// it simply returns the passed in expression.
ExprResult MaybeBindToTemporary(Expr *E);

bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
                             MultiExprArg ArgsPtr,
                             SourceLocation Loc,
                             SmallVectorImpl<Expr*> &ConvertedArgs,
                             bool AllowExplicit = false,
                             bool IsListInitialization = false);

ParsedType getInheritingConstructorName(CXXScopeSpec &SS,
                                        SourceLocation NameLoc,
                                        IdentifierInfo &Name);

ParsedType getDestructorName(SourceLocation TildeLoc,
                             IdentifierInfo &II, SourceLocation NameLoc,
                             Scope *S, CXXScopeSpec &SS,
                             ParsedType ObjectType,
                             bool EnteringContext);

ParsedType getDestructorTypeForDecltype(const DeclSpec &DS,
                                        ParsedType ObjectType);

// Checks that reinterpret casts don't have undefined behavior.
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
                                    bool IsDereference, SourceRange Range);

/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             SourceLocation LAngleBracketLoc,
                             Declarator &D,
                             SourceLocation RAngleBracketLoc,
                             SourceLocation LParenLoc,
                             Expr *E,
                             SourceLocation RParenLoc);

ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             TypeSourceInfo *Ty,
                             Expr *E,
                             SourceRange AngleBrackets,
                             SourceRange Parens);

ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXTypeid - Parse typeid( something ).
ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXUuidof - Parse __uuidof( something ).
ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

/// \brief Handle a C++1z fold-expression: ( expr op ... op expr ).
ExprResult ActOnCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            tok::TokenKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            BinaryOperatorKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildEmptyCXXFoldExpr(SourceLocation EllipsisLoc,
                                 BinaryOperatorKind Operator);

//// ActOnCXXThis -  Parse 'this' pointer.
ExprResult ActOnCXXThis(SourceLocation loc);

/// \brief Try to retrieve the type of the 'this' pointer.
///
/// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
QualType getCurrentThisType();

/// \brief When non-NULL, the C++ 'this' expression is allowed despite the
/// current context not being a non-static member function. In such cases,
/// this provides the type used for 'this'.
QualType CXXThisTypeOverride;

/// \brief RAII object used to temporarily allow the C++ 'this' expression
/// to be used, with the given qualifiers on the current class type.
class CXXThisScopeRAII {
  Sema &S;
  QualType OldCXXThisTypeOverride;
  bool Enabled;

public:
  /// \brief Introduce a new scope where 'this' may be allowed (when enabled),
  /// using the given declaration (which is either a class template or a
  /// class) along with the given qualifiers.
  /// along with the qualifiers placed on '*this'.
  CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
                   bool Enabled = true);

  ~CXXThisScopeRAII();
};

/// \brief Make sure the value of 'this' is actually available in the current
/// context, if it is a potentially evaluated context.
///
/// \param Loc The location at which the capture of 'this' occurs.
///
/// \param Explicit Whether 'this' is explicitly captured in a lambda
/// capture list.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// 'this' that may or may not be used in certain specializations of
/// a nested generic lambda (depending on whether the name resolves to
/// a non-static member function or a static function).
/// \return returns 'true' if failed, 'false' if success.
bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false,
    bool BuildAndDiagnose = true,
    const unsigned *const FunctionScopeIndexToStopAt = nullptr,
    bool ByCopy = false);

/// \brief Determine whether the given type is the type of *this that is used
/// outside of the body of a member function for a type that is currently
/// being defined.
bool isThisOutsideMemberFunctionBody(QualType BaseType);

/// ActOnCXXBoolLiteral - Parse {true,false} literals.
ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);


/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);

ExprResult
ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef<AvailabilitySpec> AvailSpecs,
                               SourceLocation AtLoc, SourceLocation RParen);

/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);

//// ActOnCXXThrow -  Parse throw expressions.
ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
                         bool IsThrownVarInScope);
bool CheckCXXThrowOperand(SourceLocation ThrowLoc, QualType ThrowTy, Expr *E);

/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
/// Can be interpreted either as function-style casting ("int(x)")
/// or class type construction ("ClassType(x,y,z)")
/// or creation of a value-initialized type ("int()").
ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
                                     SourceLocation LParenOrBraceLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenOrBraceLoc,
                                     bool ListInitialization);

ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
                                     SourceLocation LParenLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenLoc,
                                     bool ListInitialization);

/// ActOnCXXNew - Parsed a C++ 'new' expression.
ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens, Declarator &D,
                       Expr *Initializer);
ExprResult BuildCXXNew(SourceRange Range, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens,
                       QualType AllocType,
                       TypeSourceInfo *AllocTypeInfo,
                       Expr *ArraySize,
                       SourceRange DirectInitRange,
                       Expr *Initializer);

bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
                        SourceRange R);
bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
                             bool UseGlobal, QualType AllocType, bool IsArray,
                             bool &PassAlignment, MultiExprArg PlaceArgs,
                             FunctionDecl *&OperatorNew,
                             FunctionDecl *&OperatorDelete);
void DeclareGlobalNewDelete();
void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
                                     ArrayRef<QualType> Params);

bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
                              DeclarationName Name, FunctionDecl* &Operator,
                              bool Diagnose = true);
FunctionDecl *FindUsualDeallocationFunction(SourceLocation StartLoc,
                                            bool CanProvideSize,
                                            bool Overaligned,
                                            DeclarationName Name);
FunctionDecl *FindDeallocationFunctionForDestructor(SourceLocation StartLoc,
                                                    CXXRecordDecl *RD);

/// ActOnCXXDelete - Parsed a C++ 'delete' expression
ExprResult ActOnCXXDelete(SourceLocation StartLoc,
                          bool UseGlobal, bool ArrayForm,
                          Expr *Operand);
void CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
                          bool IsDelete, bool CallCanBeVirtual,
                          bool WarnOnNonAbstractTypes,
                          SourceLocation DtorLoc);

ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
                             Expr *Operand, SourceLocation RParen);
ExprResult BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
                                SourceLocation RParen);

/// \brief Parsed one of the type trait support pseudo-functions.
ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<ParsedType> Args,
                          SourceLocation RParenLoc);
ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<TypeSourceInfo *> Args,
                          SourceLocation RParenLoc);

/// ActOnArrayTypeTrait - Parsed one of the binary type trait support
/// pseudo-functions.
ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               ParsedType LhsTy,
                               Expr *DimExpr,
                               SourceLocation RParen);

ExprResult BuildArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               TypeSourceInfo *TSInfo,
                               Expr *DimExpr,
                               SourceLocation RParen);

/// ActOnExpressionTrait - Parsed one of the unary type trait support
/// pseudo-functions.
ExprResult ActOnExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult BuildExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult ActOnStartCXXMemberReference(Scope *S,
                                        Expr *Base,
                                        SourceLocation OpLoc,
                                        tok::TokenKind OpKind,
                                        ParsedType &ObjectType,
                                        bool &MayBePseudoDestructor);

ExprResult BuildPseudoDestructorExpr(Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     const CXXScopeSpec &SS,
                                     TypeSourceInfo *ScopeType,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                   PseudoDestructorTypeStorage DestroyedType);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     CXXScopeSpec &SS,
                                     UnqualifiedId &FirstTypeName,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                     UnqualifiedId &SecondTypeName);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     SourceLocation TildeLoc,
                                     const DeclSpec& DS);

/// MaybeCreateExprWithCleanups - If the current full-expression
/// requires any cleanups, surround it with a ExprWithCleanups node.
/// Otherwise, just returns the passed-in expression.
Expr *MaybeCreateExprWithCleanups(Expr *SubExpr);
Stmt *MaybeCreateStmtWithCleanups(Stmt *SubStmt);
ExprResult MaybeCreateExprWithCleanups(ExprResult SubExpr);

MaterializeTemporaryExpr *
CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
                               bool BoundToLvalueReference);

ExprResult ActOnFinishFullExpr(Expr *Expr) {
  return ActOnFinishFullExpr(Expr, Expr ? Expr->getExprLoc()
                                        : SourceLocation());
}
ExprResult ActOnFinishFullExpr(Expr *Expr, SourceLocation CC,
                               bool DiscardedValue = false,
                               bool IsConstexpr = false,
                               bool IsLambdaInitCaptureInitializer = false);
StmtResult ActOnFinishFullStmt(Stmt *Stmt);

// Marks SS invalid if it represents an incomplete type.
bool RequireCompleteDeclContext(CXXScopeSpec &SS, DeclContext *DC);

DeclContext *computeDeclContext(QualType T);
DeclContext *computeDeclContext(const CXXScopeSpec &SS,
                                bool EnteringContext = false);
bool isDependentScopeSpecifier(const CXXScopeSpec &SS);
CXXRecordDecl *getCurrentInstantiationOf(NestedNameSpecifier *NNS);

/// \brief The parser has parsed a global nested-name-specifier '::'.
///
/// \param CCLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXGlobalScopeSpecifier(SourceLocation CCLoc, CXXScopeSpec &SS);

/// \brief The parser has parsed a '__super' nested-name-specifier.
///
/// \param SuperLoc The location of the '__super' keyword.
///
/// \param ColonColonLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
                              SourceLocation ColonColonLoc, CXXScopeSpec &SS);

bool isAcceptableNestedNameSpecifier(const NamedDecl *SD,
                                     bool *CanCorrect = nullptr);
NamedDecl *FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS);

/// \brief Keeps information about an identifier in a nested-name-spec.
///
struct NestedNameSpecInfo {
  /// \brief The type of the object, if we're parsing nested-name-specifier in
  /// a member access expression.
  ParsedType ObjectType;

  /// \brief The identifier preceding the '::'.
  IdentifierInfo *Identifier;

  /// \brief The location of the identifier.
  SourceLocation IdentifierLoc;

  /// \brief The location of the '::'.
  SourceLocation CCLoc;

  /// \brief Creates info object for the most typical case.
  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
           SourceLocation ColonColonLoc, ParsedType ObjectType = ParsedType())
    : ObjectType(ObjectType), Identifier(II), IdentifierLoc(IdLoc),
      CCLoc(ColonColonLoc) {
  }

  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
                     SourceLocation ColonColonLoc, QualType ObjectType)
    : ObjectType(ParsedType::make(ObjectType)), Identifier(II),
      IdentifierLoc(IdLoc), CCLoc(ColonColonLoc) {
  }
};

bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
                                  NestedNameSpecInfo &IdInfo);

bool BuildCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 NamedDecl *ScopeLookupResult,
                                 bool ErrorRecoveryLookup,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

/// \brief The parser has parsed a nested-name-specifier 'identifier::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param IdInfo Parser information about an identifier in the
/// nested-name-spec.
///
/// \param EnteringContext Whether we're entering the context nominated by
/// this nested-name-specifier.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param ErrorRecoveryLookup If true, then this method is called to improve
/// error recovery. In this case do not emit error message.
///
/// \param IsCorrectedToColon If not null, suggestions to replace '::' -> ':'
/// are allowed.  The bool value pointed by this parameter is set to 'true'
/// if the identifier is treated as if it was followed by ':', not '::'.
///
/// \param OnlyNamespace If true, only considers namespaces in lookup.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 bool ErrorRecoveryLookup = false,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

ExprResult ActOnDecltypeExpression(Expr *E);

bool ActOnCXXNestedNameSpecifierDecltype(CXXScopeSpec &SS,
                                         const DeclSpec &DS,
                                         SourceLocation ColonColonLoc);

bool IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
                               NestedNameSpecInfo &IdInfo,
                               bool EnteringContext);

/// \brief The parser has parsed a nested-name-specifier
/// 'template[opt] template-name < template-args >::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param TemplateKWLoc the location of the 'template' keyword, if any.
/// \param TemplateName the template name.
/// \param TemplateNameLoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
/// \param CCLoc The location of the '::'.
///
/// \param EnteringContext Whether we're entering the context of the
/// nested-name-specifier.
///
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 TemplateTy TemplateName,
                                 SourceLocation TemplateNameLoc,
                                 SourceLocation LAngleLoc,
                                 ASTTemplateArgsPtr TemplateArgs,
                                 SourceLocation RAngleLoc,
                                 SourceLocation CCLoc,
                                 bool EnteringContext);

/// \brief Given a C++ nested-name-specifier, produce an annotation value
/// that the parser can use later to reconstruct the given
/// nested-name-specifier.
///
/// \param SS A nested-name-specifier.
///
/// \returns A pointer containing all of the information in the
/// nested-name-specifier \p SS.
void *SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS);

/// \brief Given an annotation pointer for a nested-name-specifier, restore
/// the nested-name-specifier structure.
///
/// \param Annotation The annotation pointer, produced by
/// \c SaveNestedNameSpecifierAnnotation().
///
/// \param AnnotationRange The source range corresponding to the annotation.
///
/// \param SS The nested-name-specifier that will be updated with the contents
/// of the annotation pointer.
void RestoreNestedNameSpecifierAnnotation(void *Annotation,
                                          SourceRange AnnotationRange,
                                          CXXScopeSpec &SS);

bool ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
/// scope or nested-name-specifier) is parsed, part of a declarator-id.
/// After this method is called, according to [C++ 3.4.3p3], names should be
/// looked up in the declarator-id's scope, until the declarator is parsed and
/// ActOnCXXExitDeclaratorScope is called.
/// The 'SS' should be a non-empty valid CXXScopeSpec.
bool ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS);

/// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
/// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
/// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
/// Used to indicate that names should revert to being looked up in the
/// defining scope.
void ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
/// initializer for the declaration 'Dcl'.
/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
/// static data member of class X, names should be looked up in the scope of
/// class X.
void ActOnCXXEnterDeclInitializer(Scope *S, Decl *Dcl);

/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
/// initializer for the declaration 'Dcl'.
void ActOnCXXExitDeclInitializer(Scope *S, Decl *Dcl);

/// \brief Create a new lambda closure type.
CXXRecordDecl *createLambdaClosureType(SourceRange IntroducerRange,
                                       TypeSourceInfo *Info,
                                       bool KnownDependent,
                                       LambdaCaptureDefault CaptureDefault);

/// \brief Start the definition of a lambda expression.
CXXMethodDecl *startLambdaDefinition(CXXRecordDecl *Class,
                                     SourceRange IntroducerRange,
                                     TypeSourceInfo *MethodType,
                                     SourceLocation EndLoc,
                                     ArrayRef<ParmVarDecl *> Params,
                                     bool IsConstexprSpecified);

/// \brief Endow the lambda scope info with the relevant properties.
void buildLambdaScope(sema::LambdaScopeInfo *LSI,
                      CXXMethodDecl *CallOperator,
                      SourceRange IntroducerRange,
                      LambdaCaptureDefault CaptureDefault,
                      SourceLocation CaptureDefaultLoc,
                      bool ExplicitParams,
                      bool ExplicitResultType,
                      bool Mutable);

/// \brief Perform initialization analysis of the init-capture and perform
/// any implicit conversions such as an lvalue-to-rvalue conversion if
/// not being used to initialize a reference.
ParsedType actOnLambdaInitCaptureInitialization(
    SourceLocation Loc, bool ByRef, IdentifierInfo *Id,
    LambdaCaptureInitKind InitKind, Expr *&Init) {
  return ParsedType::make(buildLambdaInitCaptureInitialization(
      Loc, ByRef, Id, InitKind != LambdaCaptureInitKind::CopyInit, Init));
}
QualType buildLambdaInitCaptureInitialization(SourceLocation Loc, bool ByRef,
                                              IdentifierInfo *Id,
                                              bool DirectInit, Expr *&Init);

/// \brief Create a dummy variable within the declcontext of the lambda's
///  call operator, for name lookup purposes for a lambda init capture.
///
///  CodeGen handles emission of lambda captures, ignoring these dummy
///  variables appropriately.
VarDecl *createLambdaInitCaptureVarDecl(SourceLocation Loc,
                                        QualType InitCaptureType,
                                        IdentifierInfo *Id,
                                        unsigned InitStyle, Expr *Init);

/// \brief Build the implicit field for an init-capture.
FieldDecl *buildInitCaptureField(sema::LambdaScopeInfo *LSI, VarDecl *Var);

/// \brief Note that we have finished the explicit captures for the
/// given lambda.
void finishLambdaExplicitCaptures(sema::LambdaScopeInfo *LSI);

/// \brief Introduce the lambda parameters into scope.
void addLambdaParameters(CXXMethodDecl *CallOperator, Scope *CurScope);

/// \brief Deduce a block or lambda's return type based on the return
/// statements present in the body.
void deduceClosureReturnType(sema::CapturingScopeInfo &CSI);

/// ActOnStartOfLambdaDefinition - This is called just before we start
/// parsing the body of a lambda; it analyzes the explicit captures and
/// arguments, and sets up various data-structures for the body of the
/// lambda.
void ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
                                  Declarator &ParamInfo, Scope *CurScope);

/// ActOnLambdaError - If there is an error parsing a lambda, this callback
/// is invoked to pop the information about the lambda.
void ActOnLambdaError(SourceLocation StartLoc, Scope *CurScope,
                      bool IsInstantiation = false);

/// ActOnLambdaExpr - This is called when the body of a lambda expression
/// was successfully completed.
ExprResult ActOnLambdaExpr(SourceLocation StartLoc, Stmt *Body,
                           Scope *CurScope);

/// \brief Does copying/destroying the captured variable have side effects?
bool CaptureHasSideEffects(const sema::LambdaScopeInfo::Capture &From);

/// \brief Diagnose if an explicit lambda capture is unused.
void DiagnoseUnusedLambdaCapture(const sema::LambdaScopeInfo::Capture &From);

/// \brief Complete a lambda-expression having processed and attached the
/// lambda body.
ExprResult BuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
                           sema::LambdaScopeInfo *LSI);

/// Get the return type to use for a lambda's conversion function(s) to
/// function pointer type, given the type of the call operator.
QualType
getLambdaConversionFunctionResultType(const FunctionProtoType *CallOpType);

/// \brief Define the "body" of the conversion from a lambda object to a
/// function pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToFunctionPointerConversion(
       SourceLocation CurrentLoc, CXXConversionDecl *Conv);

/// \brief Define the "body" of the conversion from a lambda object to a
/// block pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToBlockPointerConversion(SourceLocation CurrentLoc,
                                                  CXXConversionDecl *Conv);

ExprResult BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
                                         SourceLocation ConvLocation,
                                         CXXConversionDecl *Conv,
                                         Expr *Src);

// ParseObjCStringLiteral - Parse Objective-C string literals.
ExprResult ParseObjCStringLiteral(SourceLocation *AtLocs,
                                  ArrayRef<Expr *> Strings);

ExprResult BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S);

/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
/// numeric literal expression. Type of the expression will be "NSNumber *"
/// or "id" if NSNumber is unavailable.
ExprResult BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number);
ExprResult ActOnObjCBoolLiteral(SourceLocation AtLoc, SourceLocation ValueLoc,
                                bool Value);
ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements);

/// BuildObjCBoxedExpr - builds an ObjCBoxedExpr AST node for the
/// '@' prefixed parenthesized expression. The type of the expression will
/// either be "NSNumber *", "NSString *" or "NSValue *" depending on the type
/// of ValueType, which is allowed to be a built-in numeric type, "char *",
/// "const char *" or C structure with attribute 'objc_boxable'.
ExprResult BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr);

ExprResult BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
                                        Expr *IndexExpr,
                                        ObjCMethodDecl *getterMethod,
                                        ObjCMethodDecl *setterMethod);

ExprResult BuildObjCDictionaryLiteral(SourceRange SR,
                             MutableArrayRef<ObjCDictionaryElement> Elements);

ExprResult BuildObjCEncodeExpression(SourceLocation AtLoc,
                                TypeSourceInfo *EncodedTypeInfo,
                                SourceLocation RParenLoc);
ExprResult BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl,
                                  CXXConversionDecl *Method,
                                  bool HadMultipleCandidates);

ExprResult ParseObjCEncodeExpression(SourceLocation AtLoc,
                                     SourceLocation EncodeLoc,
                                     SourceLocation LParenLoc,
                                     ParsedType Ty,
                                     SourceLocation RParenLoc);

/// ParseObjCSelectorExpression - Build selector expression for \@selector
ExprResult ParseObjCSelectorExpression(Selector Sel,
                                       SourceLocation AtLoc,
                                       SourceLocation SelLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation RParenLoc,
                                       bool WarnMultipleSelectors);

/// ParseObjCProtocolExpression - Build protocol expression for \@protocol
ExprResult ParseObjCProtocolExpression(IdentifierInfo * ProtocolName,
                                       SourceLocation AtLoc,
                                       SourceLocation ProtoLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation ProtoIdLoc,
                                       SourceLocation RParenLoc);

//===--------------------------------------------------------------------===//
// C++ Declarations
//
Decl *ActOnStartLinkageSpecification(Scope *S,
                                     SourceLocation ExternLoc,
                                     Expr *LangStr,
                                     SourceLocation LBraceLoc);
Decl *ActOnFinishLinkageSpecification(Scope *S,
                                      Decl *LinkageSpec,
                                      SourceLocation RBraceLoc);


//===--------------------------------------------------------------------===//
// C++ Classes
//
bool isCurrentClassName(const IdentifierInfo &II, Scope *S,
                        const CXXScopeSpec *SS = nullptr);
bool isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS);

bool ActOnAccessSpecifier(AccessSpecifier Access,
                          SourceLocation ASLoc,
                          SourceLocation ColonLoc,
                          AttributeList *Attrs = nullptr);

NamedDecl *ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS,
                               Declarator &D,
                               MultiTemplateParamsArg TemplateParameterLists,
                               Expr *BitfieldWidth, const VirtSpecifiers &VS,
                               InClassInitStyle InitStyle);

void ActOnStartCXXInClassMemberInitializer();
void ActOnFinishCXXInClassMemberInitializer(Decl *VarDecl,
                                            SourceLocation EqualLoc,
                                            Expr *Init);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  SourceLocation LParenLoc,
                                  ArrayRef<Expr *> Args,
                                  SourceLocation RParenLoc,
                                  SourceLocation EllipsisLoc);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *InitList,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *Init,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemberInitializer(ValueDecl *Member,
                                     Expr *Init,
                                     SourceLocation IdLoc);

MemInitResult BuildBaseInitializer(QualType BaseType,
                                   TypeSourceInfo *BaseTInfo,
                                   Expr *Init,
                                   CXXRecordDecl *ClassDecl,
                                   SourceLocation EllipsisLoc);

MemInitResult BuildDelegatingInitializer(TypeSourceInfo *TInfo,
                                         Expr *Init,
                                         CXXRecordDecl *ClassDecl);

bool SetDelegatingInitializer(CXXConstructorDecl *Constructor,
                              CXXCtorInitializer *Initializer);

bool SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
                         ArrayRef<CXXCtorInitializer *> Initializers = None);

void SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation);


/// MarkBaseAndMemberDestructorsReferenced - Given a record decl,
/// mark all the non-trivial destructors of its members and bases as
/// referenced.
void MarkBaseAndMemberDestructorsReferenced(SourceLocation Loc,
                                            CXXRecordDecl *Record);

/// \brief The list of classes whose vtables have been used within
/// this translation unit, and the source locations at which the
/// first use occurred.
typedef std::pair<CXXRecordDecl*, SourceLocation> VTableUse;

/// \brief The list of vtables that are required but have not yet been
/// materialized.
SmallVector<VTableUse, 16> VTableUses;

/// \brief The set of classes whose vtables have been used within
/// this translation unit, and a bit that will be true if the vtable is
/// required to be emitted (otherwise, it should be emitted only if needed
/// by code generation).
llvm::DenseMap<CXXRecordDecl *, bool> VTablesUsed;

/// \brief Load any externally-stored vtable uses.
void LoadExternalVTableUses();

/// \brief Note that the vtable for the given class was used at the
/// given location.
void MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
                    bool DefinitionRequired = false);

/// \brief Mark the exception specifications of all virtual member functions
/// in the given class as needed.
void MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
                                           const CXXRecordDecl *RD);

/// MarkVirtualMembersReferenced - Will mark all members of the given
/// CXXRecordDecl referenced.
void MarkVirtualMembersReferenced(SourceLocation Loc,
                                  const CXXRecordDecl *RD);

/// \brief Define all of the vtables that have been used in this
/// translation unit and reference any virtual members used by those
/// vtables.
///
/// \returns true if any work was done, false otherwise.
bool DefineUsedVTables();

void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl);

void ActOnMemInitializers(Decl *ConstructorDecl,
                          SourceLocation ColonLoc,
                          ArrayRef<CXXCtorInitializer*> MemInits,
                          bool AnyErrors);

/// \brief Check class-level dllimport/dllexport attribute. The caller must
/// ensure that referenceDLLExportedClassMethods is called some point later
/// when all outer classes of Class are complete.
void checkClassLevelDLLAttribute(CXXRecordDecl *Class);

void referenceDLLExportedClassMethods();

void propagateDLLAttrToBaseClassTemplate(
    CXXRecordDecl *Class, Attr *ClassAttr,
    ClassTemplateSpecializationDecl *BaseTemplateSpec,
    SourceLocation BaseLoc);

void CheckCompletedCXXClass(CXXRecordDecl *Record);

/// Check that the C++ class annoated with "trivial_abi" satisfies all the
/// conditions that are needed for the attribute to have an effect.
void checkIllFormedTrivialABIStruct(CXXRecordDecl &RD);

void ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
                                       Decl *TagDecl,
                                       SourceLocation LBrac,
                                       SourceLocation RBrac,
                                       AttributeList *AttrList);
void ActOnFinishCXXMemberDecls();
void ActOnFinishCXXNonNestedClass(Decl *D);

void ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param);
unsigned ActOnReenterTemplateScope(Scope *S, Decl *Template);
void ActOnStartDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnDelayedCXXMethodParameter(Scope *S, Decl *Param);
void ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnFinishDelayedMemberInitializers(Decl *Record);
void MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD,
                              CachedTokens &Toks);
void UnmarkAsLateParsedTemplate(FunctionDecl *FD);
bool IsInsideALocalClassWithinATemplateFunction();

Decl *ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   Expr *AssertMessageExpr,
                                   SourceLocation RParenLoc);
Decl *BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   StringLiteral *AssertMessageExpr,
                                   SourceLocation RParenLoc,
                                   bool Failed);

FriendDecl *CheckFriendTypeDecl(SourceLocation LocStart,
                                SourceLocation FriendLoc,
                                TypeSourceInfo *TSInfo);
Decl *ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
                          MultiTemplateParamsArg TemplateParams);
NamedDecl *ActOnFriendFunctionDecl(Scope *S, Declarator &D,
                                   MultiTemplateParamsArg TemplateParams);

QualType CheckConstructorDeclarator(Declarator &D, QualType R,
                                    StorageClass& SC);
void CheckConstructor(CXXConstructorDecl *Constructor);
QualType CheckDestructorDeclarator(Declarator &D, QualType R,
                                   StorageClass& SC);
bool CheckDestructor(CXXDestructorDecl *Destructor);
void CheckConversionDeclarator(Declarator &D, QualType &R,
                               StorageClass& SC);
Decl *ActOnConversionDeclarator(CXXConversionDecl *Conversion);
void CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
                                   StorageClass &SC);
void CheckDeductionGuideTemplate(FunctionTemplateDecl *TD);

void CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD);
void CheckExplicitlyDefaultedMemberExceptionSpec(CXXMethodDecl *MD,
                                                 const FunctionProtoType *T);
void CheckDelayedMemberExceptionSpecs();

//===--------------------------------------------------------------------===//
// C++ Derived Classes
//

/// ActOnBaseSpecifier - Parsed a base specifier
CXXBaseSpecifier *CheckBaseSpecifier(CXXRecordDecl *Class,
                                     SourceRange SpecifierRange,
                                     bool Virtual, AccessSpecifier Access,
                                     TypeSourceInfo *TInfo,
                                     SourceLocation EllipsisLoc);

BaseResult ActOnBaseSpecifier(Decl *classdecl,
                              SourceRange SpecifierRange,
                              ParsedAttributes &Attrs,
                              bool Virtual, AccessSpecifier Access,
                              ParsedType basetype,
                              SourceLocation BaseLoc,
                              SourceLocation EllipsisLoc);

bool AttachBaseSpecifiers(CXXRecordDecl *Class,
                          MutableArrayRef<CXXBaseSpecifier *> Bases);
void ActOnBaseSpecifiers(Decl *ClassDecl,
                         MutableArrayRef<CXXBaseSpecifier *> Bases);

bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base);
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
                   CXXBasePaths &Paths);

// FIXME: I don't like this name.
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath);

bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  SourceLocation Loc, SourceRange Range,
                                  CXXCastPath *BasePath = nullptr,
                                  bool IgnoreAccess = false);
bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  unsigned InaccessibleBaseID,
                                  unsigned AmbigiousBaseConvID,
                                  SourceLocation Loc, SourceRange Range,
                                  DeclarationName Name,
                                  CXXCastPath *BasePath,
                                  bool IgnoreAccess = false);

std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths);

bool CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionReturnType - Checks whether the return types are
/// covariant, according to C++ [class.virtual]p5.
bool CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionExceptionSpec - Checks whether the exception
/// spec is a subset of base spec.
bool CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
                                          const CXXMethodDecl *Old);

bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange);

/// CheckOverrideControl - Check C++11 override control semantics.
void CheckOverrideControl(NamedDecl *D);

/// DiagnoseAbsenceOfOverrideControl - Diagnose if 'override' keyword was
/// not used in the declaration of an overriding method.
void DiagnoseAbsenceOfOverrideControl(NamedDecl *D);

/// CheckForFunctionMarkedFinal - Checks whether a virtual member function
/// overrides a virtual member function marked 'final', according to
/// C++11 [class.virtual]p4.
bool CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
                                            const CXXMethodDecl *Old);


//===--------------------------------------------------------------------===//
// C++ Access Control
//

enum AccessResult {
  AR_accessible,
  AR_inaccessible,
  AR_dependent,
  AR_delayed
};

bool SetMemberAccessSpecifier(NamedDecl *MemberDecl,
                              NamedDecl *PrevMemberDecl,
                              AccessSpecifier LexicalAS);

AccessResult CheckUnresolvedMemberAccess(UnresolvedMemberExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckUnresolvedLookupAccess(UnresolvedLookupExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckAllocationAccess(SourceLocation OperatorLoc,
                                   SourceRange PlacementRange,
                                   CXXRecordDecl *NamingClass,
                                   DeclAccessPair FoundDecl,
                                   bool Diagnose = true);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    bool IsCopyBindingRefToTemp = false);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    const PartialDiagnostic &PDiag);
AccessResult CheckDestructorAccess(SourceLocation Loc,
                                   CXXDestructorDecl *Dtor,
                                   const PartialDiagnostic &PDiag,
                                   QualType objectType = QualType());
AccessResult CheckFriendAccess(NamedDecl *D);
AccessResult CheckMemberAccess(SourceLocation UseLoc,
                               CXXRecordDecl *NamingClass,
                               DeclAccessPair Found);
AccessResult CheckMemberOperatorAccess(SourceLocation Loc,
                                       Expr *ObjectExpr,
                                       Expr *ArgExpr,
                                       DeclAccessPair FoundDecl);
AccessResult CheckAddressOfMemberAccess(Expr *OvlExpr,
                                        DeclAccessPair FoundDecl);
AccessResult CheckBaseClassAccess(SourceLocation AccessLoc,
                                  QualType Base, QualType Derived,
                                  const CXXBasePath &Path,
                                  unsigned DiagID,
                                  bool ForceCheck = false,
                                  bool ForceUnprivileged = false);
void CheckLookupAccess(const LookupResult &R);
bool IsSimplyAccessible(NamedDecl *decl, DeclContext *Ctx);
bool isSpecialMemberAccessibleForDeletion(CXXMethodDecl *decl,
                                          AccessSpecifier access,
                                          QualType objectType);

void HandleDependentAccessCheck(const DependentDiagnostic &DD,
                       const MultiLevelTemplateArgumentList &TemplateArgs);
void PerformDependentDiagnostics(const DeclContext *Pattern,
                      const MultiLevelTemplateArgumentList &TemplateArgs);

void HandleDelayedAccessCheck(sema::DelayedDiagnostic &DD, Decl *Ctx);

/// \brief When true, access checking violations are treated as SFINAE
/// failures rather than hard errors.
bool AccessCheckingSFINAE;

enum AbstractDiagSelID {
  AbstractNone = -1,
  AbstractReturnType,
  AbstractParamType,
  AbstractVariableType,
  AbstractFieldType,
  AbstractIvarType,
  AbstractSynthesizedIvarType,
  AbstractArrayType
};

bool isAbstractType(SourceLocation Loc, QualType T);
bool RequireNonAbstractType(SourceLocation Loc, QualType T,
                            TypeDiagnoser &Diagnoser);
template <typename... Ts>
bool RequireNonAbstractType(SourceLocation Loc, QualType T, unsigned DiagID,
                            const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireNonAbstractType(Loc, T, Diagnoser);
}

void DiagnoseAbstractType(const CXXRecordDecl *RD);

//===--------------------------------------------------------------------===//
// C++ Overloaded Operators [C++ 13.5]
//

bool CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl);

bool CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl);

//===--------------------------------------------------------------------===//
// C++ Templates [C++ 14]
//
void FilterAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true);
bool hasAnyAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true);

void LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS,
                        QualType ObjectType, bool EnteringContext,
                        bool &MemberOfUnknownSpecialization);

TemplateNameKind isTemplateName(Scope *S,
                                CXXScopeSpec &SS,
                                bool hasTemplateKeyword,
                                UnqualifiedId &Name,
                                ParsedType ObjectType,
                                bool EnteringContext,
                                TemplateTy &Template,
                                bool &MemberOfUnknownSpecialization);

/// Determine whether a particular identifier might be the name in a C++1z
/// deduction-guide declaration.
bool isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
                          SourceLocation NameLoc,
                          ParsedTemplateTy *Template = nullptr);

bool DiagnoseUnknownTemplateName(const IdentifierInfo &II,
                                 SourceLocation IILoc,
                                 Scope *S,
                                 const CXXScopeSpec *SS,
                                 TemplateTy &SuggestedTemplate,
                                 TemplateNameKind &SuggestedKind);

bool DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
                                    NamedDecl *Instantiation,
                                    bool InstantiatedFromMember,
                                    const NamedDecl *Pattern,
                                    const NamedDecl *PatternDef,
                                    TemplateSpecializationKind TSK,
                                    bool Complain = true);

void DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl);
TemplateDecl *AdjustDeclIfTemplate(Decl *&Decl);

NamedDecl *ActOnTypeParameter(Scope *S, bool Typename,
                         SourceLocation EllipsisLoc,
                         SourceLocation KeyLoc,
                         IdentifierInfo *ParamName,
                         SourceLocation ParamNameLoc,
                         unsigned Depth, unsigned Position,
                         SourceLocation EqualLoc,
                         ParsedType DefaultArg);

QualType CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
                                           SourceLocation Loc);
QualType CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc);

NamedDecl *ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
                                    unsigned Depth,
                                    unsigned Position,
                                    SourceLocation EqualLoc,
                                    Expr *DefaultArg);
NamedDecl *ActOnTemplateTemplateParameter(Scope *S,
                                     SourceLocation TmpLoc,
                                     TemplateParameterList *Params,
                                     SourceLocation EllipsisLoc,
                                     IdentifierInfo *ParamName,
                                     SourceLocation ParamNameLoc,
                                     unsigned Depth,
                                     unsigned Position,
                                     SourceLocation EqualLoc,
                                     ParsedTemplateArgument DefaultArg);

TemplateParameterList *
ActOnTemplateParameterList(unsigned Depth,
                           SourceLocation ExportLoc,
                           SourceLocation TemplateLoc,
                           SourceLocation LAngleLoc,
                           ArrayRef<NamedDecl *> Params,
                           SourceLocation RAngleLoc,
                           Expr *RequiresClause);

/// \brief The context in which we are checking a template parameter list.
enum TemplateParamListContext {
  TPC_ClassTemplate,
  TPC_VarTemplate,
  TPC_FunctionTemplate,
  TPC_ClassTemplateMember,
  TPC_FriendClassTemplate,
  TPC_FriendFunctionTemplate,
  TPC_FriendFunctionTemplateDefinition,
  TPC_TypeAliasTemplate
};

bool CheckTemplateParameterList(TemplateParameterList *NewParams,
                                TemplateParameterList *OldParams,
                                TemplateParamListContext TPC);
TemplateParameterList *MatchTemplateParametersToScopeSpecifier(
    SourceLocation DeclStartLoc, SourceLocation DeclLoc,
    const CXXScopeSpec &SS, TemplateIdAnnotation *TemplateId,
    ArrayRef<TemplateParameterList *> ParamLists,
    bool IsFriend, bool &IsMemberSpecialization, bool &Invalid);

DeclResult CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
                              SourceLocation KWLoc, CXXScopeSpec &SS,
                              IdentifierInfo *Name, SourceLocation NameLoc,
                              AttributeList *Attr,
                              TemplateParameterList *TemplateParams,
                              AccessSpecifier AS,
                              SourceLocation ModulePrivateLoc,
                              SourceLocation FriendLoc,
                              unsigned NumOuterTemplateParamLists,
                          TemplateParameterList **OuterTemplateParamLists,
                              SkipBodyInfo *SkipBody = nullptr);

TemplateArgumentLoc getTrivialTemplateArgumentLoc(const TemplateArgument &Arg,
                                                  QualType NTTPType,
                                                  SourceLocation Loc);

void translateTemplateArguments(const ASTTemplateArgsPtr &In,
                                TemplateArgumentListInfo &Out);

void NoteAllFoundTemplates(TemplateName Name);

QualType CheckTemplateIdType(TemplateName Template,
                             SourceLocation TemplateLoc,
                            TemplateArgumentListInfo &TemplateArgs);

TypeResult
ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
                    TemplateTy Template, IdentifierInfo *TemplateII,
                    SourceLocation TemplateIILoc,
                    SourceLocation LAngleLoc,
                    ASTTemplateArgsPtr TemplateArgs,
                    SourceLocation RAngleLoc,
                    bool IsCtorOrDtorName = false,
                    bool IsClassName = false);

/// \brief Parsed an elaborated-type-specifier that refers to a template-id,
/// such as \c class T::template apply<U>.
TypeResult ActOnTagTemplateIdType(TagUseKind TUK,
                                  TypeSpecifierType TagSpec,
                                  SourceLocation TagLoc,
                                  CXXScopeSpec &SS,
                                  SourceLocation TemplateKWLoc,
                                  TemplateTy TemplateD,
                                  SourceLocation TemplateLoc,
                                  SourceLocation LAngleLoc,
                                  ASTTemplateArgsPtr TemplateArgsIn,
                                  SourceLocation RAngleLoc);

DeclResult ActOnVarTemplateSpecialization(
    Scope *S, Declarator &D, TypeSourceInfo *DI,
    SourceLocation TemplateKWLoc, TemplateParameterList *TemplateParams,
    StorageClass SC, bool IsPartialSpecialization);

DeclResult CheckVarTemplateId(VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              SourceLocation TemplateNameLoc,
                              const TemplateArgumentListInfo &TemplateArgs);

ExprResult CheckVarTemplateId(const CXXScopeSpec &SS,
                              const DeclarationNameInfo &NameInfo,
                              VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildTemplateIdExpr(const CXXScopeSpec &SS,
                               SourceLocation TemplateKWLoc,
                               LookupResult &R,
                               bool RequiresADL,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
                                        SourceLocation TemplateKWLoc,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

TemplateNameKind ActOnDependentTemplateName(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext,
    TemplateTy &Template, bool AllowInjectedClassName = false);

DeclResult
ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec, TagUseKind TUK,
                                 SourceLocation KWLoc,
                                 SourceLocation ModulePrivateLoc,
                                 TemplateIdAnnotation &TemplateId,
                                 AttributeList *Attr,
                               MultiTemplateParamsArg TemplateParameterLists,
                                 SkipBodyInfo *SkipBody = nullptr);

bool CheckTemplatePartialSpecializationArgs(SourceLocation Loc,
                                            TemplateDecl *PrimaryTemplate,
                                            unsigned NumExplicitArgs,
                                            ArrayRef<TemplateArgument> Args);
void CheckTemplatePartialSpecialization(
    ClassTemplatePartialSpecializationDecl *Partial);
void CheckTemplatePartialSpecialization(
    VarTemplatePartialSpecializationDecl *Partial);

Decl *ActOnTemplateDeclarator(Scope *S,
                              MultiTemplateParamsArg TemplateParameterLists,
                              Declarator &D);

bool
CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
                                       TemplateSpecializationKind NewTSK,
                                       NamedDecl *PrevDecl,
                                       TemplateSpecializationKind PrevTSK,
                                       SourceLocation PrevPtOfInstantiation,
                                       bool &SuppressNew);

bool CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
                  const TemplateArgumentListInfo &ExplicitTemplateArgs,
                                                  LookupResult &Previous);

bool CheckFunctionTemplateSpecialization(FunctionDecl *FD,
                       TemplateArgumentListInfo *ExplicitTemplateArgs,
                                         LookupResult &Previous);
bool CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous);
void CompleteMemberSpecialization(NamedDecl *Member, LookupResult &Previous);

DeclResult
ActOnExplicitInstantiation(Scope *S,
                           SourceLocation ExternLoc,
                           SourceLocation TemplateLoc,
                           unsigned TagSpec,
                           SourceLocation KWLoc,
                           const CXXScopeSpec &SS,
                           TemplateTy Template,
                           SourceLocation TemplateNameLoc,
                           SourceLocation LAngleLoc,
                           ASTTemplateArgsPtr TemplateArgs,
                           SourceLocation RAngleLoc,
                           AttributeList *Attr);

DeclResult
ActOnExplicitInstantiation(Scope *S,
                           SourceLocation ExternLoc,
                           SourceLocation TemplateLoc,
                           unsigned TagSpec,
                           SourceLocation KWLoc,
                           CXXScopeSpec &SS,
                           IdentifierInfo *Name,
                           SourceLocation NameLoc,
                           AttributeList *Attr);

DeclResult ActOnExplicitInstantiation(Scope *S,
                                      SourceLocation ExternLoc,
                                      SourceLocation TemplateLoc,
                                      Declarator &D);

TemplateArgumentLoc
SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
                                        SourceLocation TemplateLoc,
                                        SourceLocation RAngleLoc,
                                        Decl *Param,
                                        SmallVectorImpl<TemplateArgument>
                                          &Converted,
                                        bool &HasDefaultArg);

/// \brief Specifies the context in which a particular template
/// argument is being checked.
enum CheckTemplateArgumentKind {
  /// \brief The template argument was specified in the code or was
  /// instantiated with some deduced template arguments.
  CTAK_Specified,

  /// \brief The template argument was deduced via template argument
  /// deduction.
  CTAK_Deduced,

  /// \brief The template argument was deduced from an array bound
  /// via template argument deduction.
  CTAK_DeducedFromArrayBound
};

bool CheckTemplateArgument(NamedDecl *Param,
                           TemplateArgumentLoc &Arg,
                           NamedDecl *Template,
                           SourceLocation TemplateLoc,
                           SourceLocation RAngleLoc,
                           unsigned ArgumentPackIndex,
                         SmallVectorImpl<TemplateArgument> &Converted,
                           CheckTemplateArgumentKind CTAK = CTAK_Specified);

/// \brief Check that the given template arguments can be be provided to
/// the given template, converting the arguments along the way.
///
/// \param Template The template to which the template arguments are being
/// provided.
///
/// \param TemplateLoc The location of the template name in the source.
///
/// \param TemplateArgs The list of template arguments. If the template is
/// a template template parameter, this function may extend the set of
/// template arguments to also include substituted, defaulted template
/// arguments.
///
/// \param PartialTemplateArgs True if the list of template arguments is
/// intentionally partial, e.g., because we're checking just the initial
/// set of template arguments.
///
/// \param Converted Will receive the converted, canonicalized template
/// arguments.
///
/// \param UpdateArgsWithConversions If \c true, update \p TemplateArgs to
/// contain the converted forms of the template arguments as written.
/// Otherwise, \p TemplateArgs will not be modified.
///
/// \returns true if an error occurred, false otherwise.
bool CheckTemplateArgumentList(TemplateDecl *Template,
                               SourceLocation TemplateLoc,
                               TemplateArgumentListInfo &TemplateArgs,
                               bool PartialTemplateArgs,
                               SmallVectorImpl<TemplateArgument> &Converted,
                               bool UpdateArgsWithConversions = true);

bool CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
                               TemplateArgumentLoc &Arg,
                         SmallVectorImpl<TemplateArgument> &Converted);

bool CheckTemplateArgument(TemplateTypeParmDecl *Param,
                           TypeSourceInfo *Arg);
ExprResult CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
                                 QualType InstantiatedParamType, Expr *Arg,
                                 TemplateArgument &Converted,
                             CheckTemplateArgumentKind CTAK = CTAK_Specified);
bool CheckTemplateArgument(TemplateTemplateParmDecl *Param,
                           TemplateArgumentLoc &Arg,
                           unsigned ArgumentPackIndex);

ExprResult
BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
                                        QualType ParamType,
                                        SourceLocation Loc);
ExprResult
BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
                                            SourceLocation Loc);

/// \brief Enumeration describing how template parameter lists are compared
/// for equality.
enum TemplateParameterListEqualKind {
  /// \brief We are matching the template parameter lists of two templates
  /// that might be redeclarations.
  ///
  /// \code
  /// template<typename T> struct X;
  /// template<typename T> struct X;
  /// \endcode
  TPL_TemplateMatch,

  /// \brief We are matching the template parameter lists of two template
  /// template parameters as part of matching the template parameter lists
  /// of two templates that might be redeclarations.
  ///
  /// \code
  /// template<template<int I> class TT> struct X;
  /// template<template<int Value> class Other> struct X;
  /// \endcode
  TPL_TemplateTemplateParmMatch,

  /// \brief We are matching the template parameter lists of a template
  /// template argument against the template parameter lists of a template
  /// template parameter.
  ///
  /// \code
  /// template<template<int Value> class Metafun> struct X;
  /// template<int Value> struct integer_c;
  /// X<integer_c> xic;
  /// \endcode
  TPL_TemplateTemplateArgumentMatch
};

bool TemplateParameterListsAreEqual(TemplateParameterList *New,
                                    TemplateParameterList *Old,
                                    bool Complain,
                                    TemplateParameterListEqualKind Kind,
                                    SourceLocation TemplateArgLoc
                                      = SourceLocation());

bool CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams);

/// \brief Called when the parser has parsed a C++ typename
/// specifier, e.g., "typename T::type".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param II the identifier we're retrieving (e.g., 'type' in the example).
/// \param IdLoc the location of the identifier.
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS, const IdentifierInfo &II,
                  SourceLocation IdLoc);

/// \brief Called when the parser has parsed a C++ typename
/// specifier that ends in a template-id, e.g.,
/// "typename MetaFun::template apply<T1, T2>".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param TemplateLoc the location of the 'template' keyword, if any.
/// \param TemplateName The template name.
/// \param TemplateII The identifier used to name the template.
/// \param TemplateIILoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS,
                  SourceLocation TemplateLoc,
                  TemplateTy TemplateName,
                  IdentifierInfo *TemplateII,
                  SourceLocation TemplateIILoc,
                  SourceLocation LAngleLoc,
                  ASTTemplateArgsPtr TemplateArgs,
                  SourceLocation RAngleLoc);

QualType CheckTypenameType(ElaboratedTypeKeyword Keyword,
                           SourceLocation KeywordLoc,
                           NestedNameSpecifierLoc QualifierLoc,
                           const IdentifierInfo &II,
                           SourceLocation IILoc);

TypeSourceInfo *RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
                                                  SourceLocation Loc,
                                                  DeclarationName Name);
bool RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS);

ExprResult RebuildExprInCurrentInstantiation(Expr *E);
bool RebuildTemplateParamsInCurrentInstantiation(
                                              TemplateParameterList *Params);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgumentList &Args);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgument *Args,
                                unsigned NumArgs);

//===--------------------------------------------------------------------===//
// C++ Variadic Templates (C++0x [temp.variadic])
//===--------------------------------------------------------------------===//

/// Determine whether an unexpanded parameter pack might be permitted in this
/// location. Useful for error recovery.
bool isUnexpandedParameterPackPermitted();

/// \brief The context in which an unexpanded parameter pack is
/// being diagnosed.
///
/// Note that the values of this enumeration line up with the first
/// argument to the \c err_unexpanded_parameter_pack diagnostic.
enum UnexpandedParameterPackContext {
  /// \brief An arbitrary expression.
  UPPC_Expression = 0,

  /// \brief The base type of a class type.
  UPPC_BaseType,

  /// \brief The type of an arbitrary declaration.
  UPPC_DeclarationType,

  /// \brief The type of a data member.
  UPPC_DataMemberType,

  /// \brief The size of a bit-field.
  UPPC_BitFieldWidth,

  /// \brief The expression in a static assertion.
  UPPC_StaticAssertExpression,

  /// \brief The fixed underlying type of an enumeration.
  UPPC_FixedUnderlyingType,

  /// \brief The enumerator value.
  UPPC_EnumeratorValue,

  /// \brief A using declaration.
  UPPC_UsingDeclaration,

  /// \brief A friend declaration.
  UPPC_FriendDeclaration,

  /// \brief A declaration qualifier.
  UPPC_DeclarationQualifier,

  /// \brief An initializer.
  UPPC_Initializer,

  /// \brief A default argument.
  UPPC_DefaultArgument,

  /// \brief The type of a non-type template parameter.
  UPPC_NonTypeTemplateParameterType,

  /// \brief The type of an exception.
  UPPC_ExceptionType,

  /// \brief Partial specialization.
  UPPC_PartialSpecialization,

  /// \brief Microsoft __if_exists.
  UPPC_IfExists,

  /// \brief Microsoft __if_not_exists.
  UPPC_IfNotExists,

  /// \brief Lambda expression.
  UPPC_Lambda,

  /// \brief Block expression,
  UPPC_Block
};

/// \brief Diagnose unexpanded parameter packs.
///
/// \param Loc The location at which we should emit the diagnostic.
///
/// \param UPPC The context in which we are diagnosing unexpanded
/// parameter packs.
///
/// \param Unexpanded the set of unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPacks(SourceLocation Loc,
                                      UnexpandedParameterPackContext UPPC,
                                ArrayRef<UnexpandedParameterPack> Unexpanded);

/// \brief If the given type contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The source location where a diagnostc should be emitted.
///
/// \param T The type that is being checked for unexpanded parameter
/// packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc, TypeSourceInfo *T,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given expression contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param E The expression that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(Expr *E,
                     UnexpandedParameterPackContext UPPC = UPPC_Expression);

/// \brief If the given nested-name-specifier contains an unexpanded
/// parameter pack, diagnose the error.
///
/// \param SS The nested-name-specifier that is being checked for
/// unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const CXXScopeSpec &SS,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param NameInfo The name (with source location information) that
/// is being checked for unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const DeclarationNameInfo &NameInfo,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given template name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The location of the template name.
///
/// \param Template The template name that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc,
                                     TemplateName Template,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given template argument contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param Arg The template argument that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(TemplateArgumentLoc Arg,
                                     UnexpandedParameterPackContext UPPC);

/// \brief Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgument Arg,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgumentLoc Arg,
                  SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param T The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(QualType T,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param TL The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TypeLoc TL,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// nested-name-specifier.
///
/// \param NNS The nested-name-specifier that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(NestedNameSpecifierLoc NNS,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// name.
///
/// \param NameInfo The name that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(const DeclarationNameInfo &NameInfo,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Invoked when parsing a template argument followed by an
/// ellipsis, which creates a pack expansion.
///
/// \param Arg The template argument preceding the ellipsis, which
/// may already be invalid.
///
/// \param EllipsisLoc The location of the ellipsis.
ParsedTemplateArgument ActOnPackExpansion(const ParsedTemplateArgument &Arg,
                                          SourceLocation EllipsisLoc);

/// \brief Invoked when parsing a type followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Type The type preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
TypeResult ActOnPackExpansion(ParsedType Type, SourceLocation EllipsisLoc);

/// \brief Construct a pack expansion type from the pattern of the pack
/// expansion.
TypeSourceInfo *CheckPackExpansion(TypeSourceInfo *Pattern,
                                   SourceLocation EllipsisLoc,
                                   Optional<unsigned> NumExpansions);

/// \brief Construct a pack expansion type from the pattern of the pack
/// expansion.
QualType CheckPackExpansion(QualType Pattern,
                            SourceRange PatternRange,
                            SourceLocation EllipsisLoc,
                            Optional<unsigned> NumExpansions);

/// \brief Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult ActOnPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc);

/// \brief Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult CheckPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc,
                              Optional<unsigned> NumExpansions);

/// \brief Determine whether we could expand a pack expansion with the
/// given set of parameter packs into separate arguments by repeatedly
/// transforming the pattern.
///
/// \param EllipsisLoc The location of the ellipsis that identifies the
/// pack expansion.
///
/// \param PatternRange The source range that covers the entire pattern of
/// the pack expansion.
///
/// \param Unexpanded The set of unexpanded parameter packs within the
/// pattern.
///
/// \param ShouldExpand Will be set to \c true if the transformer should
/// expand the corresponding pack expansions into separate arguments. When
/// set, \c NumExpansions must also be set.
///
/// \param RetainExpansion Whether the caller should add an unexpanded
/// pack expansion after all of the expanded arguments. This is used
/// when extending explicitly-specified template argument packs per
/// C++0x [temp.arg.explicit]p9.
///
/// \param NumExpansions The number of separate arguments that will be in
/// the expanded form of the corresponding pack expansion. This is both an
/// input and an output parameter, which can be set by the caller if the
/// number of expansions is known a priori (e.g., due to a prior substitution)
/// and will be set by the callee when the number of expansions is known.
/// The callee must set this value when \c ShouldExpand is \c true; it may
/// set this value in other cases.
///
/// \returns true if an error occurred (e.g., because the parameter packs
/// are to be instantiated with arguments of different lengths), false
/// otherwise. If false, \c ShouldExpand (and possibly \c NumExpansions)
/// must be set.
bool CheckParameterPacksForExpansion(SourceLocation EllipsisLoc,
                                     SourceRange PatternRange,
                           ArrayRef<UnexpandedParameterPack> Unexpanded,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                                     bool &ShouldExpand,
                                     bool &RetainExpansion,
                                     Optional<unsigned> &NumExpansions);

/// \brief Determine the number of arguments in the given pack expansion
/// type.
///
/// This routine assumes that the number of arguments in the expansion is
/// consistent across all of the unexpanded parameter packs in its pattern.
///
/// Returns an empty Optional if the type can't be expanded.
Optional<unsigned> getNumArgumentsInExpansion(QualType T,
    const MultiLevelTemplateArgumentList &TemplateArgs);

/// \brief Determine whether the given declarator contains any unexpanded
/// parameter packs.
///
/// This routine is used by the parser to disambiguate function declarators
/// with an ellipsis prior to the ')', e.g.,
///
/// \code
///   void f(T...);
/// \endcode
///
/// To determine whether we have an (unnamed) function parameter pack or
/// a variadic function.
///
/// \returns true if the declarator contains any unexpanded parameter packs,
/// false otherwise.
bool containsUnexpandedParameterPacks(Declarator &D);

/// \brief Returns the pattern of the pack expansion for a template argument.
///
/// \param OrigLoc The template argument to expand.
///
/// \param Ellipsis Will be set to the location of the ellipsis.
///
/// \param NumExpansions Will be set to the number of expansions that will
/// be generated from this pack expansion, if known a priori.
TemplateArgumentLoc getTemplateArgumentPackExpansionPattern(
    TemplateArgumentLoc OrigLoc,
    SourceLocation &Ellipsis,
    Optional<unsigned> &NumExpansions) const;

/// Given a template argument that contains an unexpanded parameter pack, but
/// which has already been substituted, attempt to determine the number of
/// elements that will be produced once this argument is fully-expanded.
///
/// This is intended for use when transforming 'sizeof...(Arg)' in order to
/// avoid actually expanding the pack where possible.
Optional<unsigned> getFullyPackExpandedSize(TemplateArgument Arg);

//===--------------------------------------------------------------------===//
// C++ Template Argument Deduction (C++ [temp.deduct])
//===--------------------------------------------------------------------===//

/// Adjust the type \p ArgFunctionType to match the calling convention,
/// noreturn, and optionally the exception specification of \p FunctionType.
/// Deduction often wants to ignore these properties when matching function
/// types.
QualType adjustCCAndNoReturn(QualType ArgFunctionType, QualType FunctionType,
                             bool AdjustExceptionSpec = false);

/// \brief Describes the result of template argument deduction.
///
/// The TemplateDeductionResult enumeration describes the result of
/// template argument deduction, as returned from
/// DeduceTemplateArguments(). The separate TemplateDeductionInfo
/// structure provides additional information about the results of
/// template argument deduction, e.g., the deduced template argument
/// list (if successful) or the specific template parameters or
/// deduced arguments that were involved in the failure.
enum TemplateDeductionResult {
  /// \brief Template argument deduction was successful.
  TDK_Success = 0,
  /// \brief The declaration was invalid; do nothing.
  TDK_Invalid,
  /// \brief Template argument deduction exceeded the maximum template
  /// instantiation depth (which has already been diagnosed).
  TDK_InstantiationDepth,
  /// \brief Template argument deduction did not deduce a value
  /// for every template parameter.
  TDK_Incomplete,
  /// \brief Template argument deduction produced inconsistent
  /// deduced values for the given template parameter.
  TDK_Inconsistent,
  /// \brief Template argument deduction failed due to inconsistent
  /// cv-qualifiers on a template parameter type that would
  /// otherwise be deduced, e.g., we tried to deduce T in "const T"
  /// but were given a non-const "X".
  TDK_Underqualified,
  /// \brief Substitution of the deduced template argument values
  /// resulted in an error.
  TDK_SubstitutionFailure,
  /// \brief After substituting deduced template arguments, a dependent
  /// parameter type did not match the corresponding argument.
  TDK_DeducedMismatch,
  /// \brief After substituting deduced template arguments, an element of
  /// a dependent parameter type did not match the corresponding element
  /// of the corresponding argument (when deducing from an initializer list).
  TDK_DeducedMismatchNested,
  /// \brief A non-depnedent component of the parameter did not match the
  /// corresponding component of the argument.
  TDK_NonDeducedMismatch,
  /// \brief When performing template argument deduction for a function
  /// template, there were too many call arguments.
  TDK_TooManyArguments,
  /// \brief When performing template argument deduction for a function
  /// template, there were too few call arguments.
  TDK_TooFewArguments,
  /// \brief The explicitly-specified template arguments were not valid
  /// template arguments for the given template.
  TDK_InvalidExplicitArguments,
  /// \brief Checking non-dependent argument conversions failed.
  TDK_NonDependentConversionFailure,
  /// \brief Deduction failed; that's all we know.
  TDK_MiscellaneousDeductionFailure,
  /// \brief CUDA Target attributes do not match.
  TDK_CUDATargetMismatch
};

TemplateDeductionResult
DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(VarTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult SubstituteExplicitTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo &ExplicitTemplateArgs,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    SmallVectorImpl<QualType> &ParamTypes, QualType *FunctionType,
    sema::TemplateDeductionInfo &Info);

/// brief A function argument from which we performed template argument
// deduction for a call.
struct OriginalCallArg {
  OriginalCallArg(QualType OriginalParamType, bool DecomposedParam,
                  unsigned ArgIdx, QualType OriginalArgType)
      : OriginalParamType(OriginalParamType),
        DecomposedParam(DecomposedParam), ArgIdx(ArgIdx),
        OriginalArgType(OriginalArgType) {}

  QualType OriginalParamType;
  bool DecomposedParam;
  unsigned ArgIdx;
  QualType OriginalArgType;
};

TemplateDeductionResult FinishTemplateArgumentDeduction(
    FunctionTemplateDecl *FunctionTemplate,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    unsigned NumExplicitlySpecified, FunctionDecl *&Specialization,
    sema::TemplateDeductionInfo &Info,
    SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs = nullptr,
    bool PartialOverloading = false,
    llvm::function_ref<bool()> CheckNonDependent = []{ return false; });

TemplateDeductionResult DeduceTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args,
    FunctionDecl *&Specialization, sema::TemplateDeductionInfo &Info,
    bool PartialOverloading,
    llvm::function_ref<bool(ArrayRef<QualType>)> CheckNonDependent);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        QualType ArgFunctionType,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        QualType ToType,
                        CXXConversionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

/// \brief Substitute Replacement for \p auto in \p TypeWithAuto
QualType SubstAutoType(QualType TypeWithAuto, QualType Replacement);
/// \brief Substitute Replacement for auto in TypeWithAuto
TypeSourceInfo* SubstAutoTypeSourceInfo(TypeSourceInfo *TypeWithAuto,
                                        QualType Replacement);
/// \brief Completely replace the \c auto in \p TypeWithAuto by
/// \p Replacement. This does not retain any \c auto type sugar.
QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement);

/// \brief Result type of DeduceAutoType.
enum DeduceAutoResult {
  DAR_Succeeded,
  DAR_Failed,
  DAR_FailedAlreadyDiagnosed
};

DeduceAutoResult
DeduceAutoType(TypeSourceInfo *AutoType, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
DeduceAutoResult
DeduceAutoType(TypeLoc AutoTypeLoc, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
void DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init);
bool DeduceReturnType(FunctionDecl *FD, SourceLocation Loc,
                      bool Diagnose = true);

/// \brief Declare implicit deduction guides for a class template if we've
/// not already done so.
void DeclareImplicitDeductionGuides(TemplateDecl *Template,
                                    SourceLocation Loc);

QualType DeduceTemplateSpecializationFromInitializer(
    TypeSourceInfo *TInfo, const InitializedEntity &Entity,
    const InitializationKind &Kind, MultiExprArg Init);

QualType deduceVarTypeFromInitializer(VarDecl *VDecl, DeclarationName Name,
                                      QualType Type, TypeSourceInfo *TSI,
                                      SourceRange Range, bool DirectInit,
                                      Expr *Init);

TypeLoc getReturnTypeLoc(FunctionDecl *FD) const;

bool DeduceFunctionTypeFromReturnExpr(FunctionDecl *FD,
                                      SourceLocation ReturnLoc,
                                      Expr *&RetExpr, AutoType *AT);

FunctionTemplateDecl *getMoreSpecializedTemplate(FunctionTemplateDecl *FT1,
                                                 FunctionTemplateDecl *FT2,
                                                 SourceLocation Loc,
                                         TemplatePartialOrderingContext TPOC,
                                                 unsigned NumCallArguments1,
                                                 unsigned NumCallArguments2);
UnresolvedSetIterator
getMostSpecialized(UnresolvedSetIterator SBegin, UnresolvedSetIterator SEnd,
                   TemplateSpecCandidateSet &FailedCandidates,
                   SourceLocation Loc,
                   const PartialDiagnostic &NoneDiag,
                   const PartialDiagnostic &AmbigDiag,
                   const PartialDiagnostic &CandidateDiag,
                   bool Complain = true, QualType TargetType = QualType());

ClassTemplatePartialSpecializationDecl *
getMoreSpecializedPartialSpecialization(
                                ClassTemplatePartialSpecializationDecl *PS1,
                                ClassTemplatePartialSpecializationDecl *PS2,
                                SourceLocation Loc);

bool isMoreSpecializedThanPrimary(ClassTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

VarTemplatePartialSpecializationDecl *getMoreSpecializedPartialSpecialization(
    VarTemplatePartialSpecializationDecl *PS1,
    VarTemplatePartialSpecializationDecl *PS2, SourceLocation Loc);

bool isMoreSpecializedThanPrimary(VarTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

bool isTemplateTemplateParameterAtLeastAsSpecializedAs(
    TemplateParameterList *P, TemplateDecl *AArg, SourceLocation Loc);

void MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs,
                                bool OnlyDeduced,
                                unsigned Depth,
                                llvm::SmallBitVector &Used);
void MarkDeducedTemplateParameters(
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced) {
  return MarkDeducedTemplateParameters(Context, FunctionTemplate, Deduced);
}
static void MarkDeducedTemplateParameters(ASTContext &Ctx,
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced);

//===--------------------------------------------------------------------===//
// C++ Template Instantiation
//

MultiLevelTemplateArgumentList
getTemplateInstantiationArgs(NamedDecl *D,
                             const TemplateArgumentList *Innermost = nullptr,
                             bool RelativeToPrimary = false,
                             const FunctionDecl *Pattern = nullptr);

/// A context in which code is being synthesized (where a source location
/// alone is not sufficient to identify the context). This covers template
/// instantiation and various forms of implicitly-generated functions.
struct CodeSynthesisContext {
  /// \brief The kind of template instantiation we are performing
  enum SynthesisKind {
    /// We are instantiating a template declaration. The entity is
    /// the declaration we're instantiating (e.g., a CXXRecordDecl).
    TemplateInstantiation,

    /// We are instantiating a default argument for a template
    /// parameter. The Entity is the template parameter whose argument is
    /// being instantiated, the Template is the template, and the
    /// TemplateArgs/NumTemplateArguments provide the template arguments as
    /// specified.
    DefaultTemplateArgumentInstantiation,

    /// We are instantiating a default argument for a function.
    /// The Entity is the ParmVarDecl, and TemplateArgs/NumTemplateArgs
    /// provides the template arguments as specified.
    DefaultFunctionArgumentInstantiation,

    /// We are substituting explicit template arguments provided for
    /// a function template. The entity is a FunctionTemplateDecl.
    ExplicitTemplateArgumentSubstitution,

    /// We are substituting template argument determined as part of
    /// template argument deduction for either a class template
    /// partial specialization or a function template. The
    /// Entity is either a {Class|Var}TemplatePartialSpecializationDecl or
    /// a TemplateDecl.
    DeducedTemplateArgumentSubstitution,

    /// We are substituting prior template arguments into a new
    /// template parameter. The template parameter itself is either a
    /// NonTypeTemplateParmDecl or a TemplateTemplateParmDecl.
    PriorTemplateArgumentSubstitution,

    /// We are checking the validity of a default template argument that
    /// has been used when naming a template-id.
    DefaultTemplateArgumentChecking,

    /// We are instantiating the exception specification for a function
    /// template which was deferred until it was needed.
    ExceptionSpecInstantiation,

    /// We are declaring an implicit special member function.
    DeclaringSpecialMember,

    /// We are defining a synthesized function (such as a defaulted special
    /// member).
    DefiningSynthesizedFunction,

    /// Added for Template instantiation observation.
    /// Memoization means we are _not_ instantiating a template because
    /// it is already instantiated (but we entered a context where we
    /// would have had to if it was not already instantiated).
    Memoization
  } Kind;

  /// \brief Was the enclosing context a non-instantiation SFINAE context?
  bool SavedInNonInstantiationSFINAEContext;

  /// \brief The point of instantiation or synthesis within the source code.
  SourceLocation PointOfInstantiation;

  /// \brief The entity that is being synthesized.
  Decl *Entity;

  /// \brief The template (or partial specialization) in which we are
  /// performing the instantiation, for substitutions of prior template
  /// arguments.
  NamedDecl *Template;

  /// \brief The list of template arguments we are substituting, if they
  /// are not part of the entity.
  const TemplateArgument *TemplateArgs;

  // FIXME: Wrap this union around more members, or perhaps store the
  // kind-specific members in the RAII object owning the context.
  union {
    /// \brief The number of template arguments in TemplateArgs.
    unsigned NumTemplateArgs;

    /// \brief The special member being declared or defined.
    CXXSpecialMember SpecialMember;
  };

  ArrayRef<TemplateArgument> template_arguments() const {
    assert(Kind != DeclaringSpecialMember)(static_cast <bool> (Kind != DeclaringSpecialMember) ? void
 (0) : __assert_fail ("Kind != DeclaringSpecialMember", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7167, __extension__ __PRETTY_FUNCTION__));
    return {TemplateArgs, NumTemplateArgs};
  }

  /// \brief The template deduction info object associated with the
  /// substitution or checking of explicit or deduced template arguments.
  sema::TemplateDeductionInfo *DeductionInfo;

  /// \brief The source range that covers the construct that cause
  /// the instantiation, e.g., the template-id that causes a class
  /// template instantiation.
  SourceRange InstantiationRange;

  CodeSynthesisContext()
    : Kind(TemplateInstantiation), Entity(nullptr), Template(nullptr),
      TemplateArgs(nullptr), NumTemplateArgs(0), DeductionInfo(nullptr) {}

  /// \brief Determines whether this template is an actual instantiation
  /// that should be counted toward the maximum instantiation depth.
  bool isInstantiationRecord() const;
};

/// \brief List of active code synthesis contexts.
///
/// This vector is treated as a stack. As synthesis of one entity requires
/// synthesis of another, additional contexts are pushed onto the stack.
SmallVector<CodeSynthesisContext, 16> CodeSynthesisContexts;

/// Specializations whose definitions are currently being instantiated.
llvm::DenseSet<std::pair<Decl *, unsigned>> InstantiatingSpecializations;

/// Non-dependent types used in templates that have already been instantiated
/// by some template instantiation.
llvm::DenseSet<QualType> InstantiatedNonDependentTypes;

/// \brief Extra modules inspected when performing a lookup during a template
/// instantiation. Computed lazily.
SmallVector<Module*, 16> CodeSynthesisContextLookupModules;

/// \brief Cache of additional modules that should be used for name lookup
/// within the current template instantiation. Computed lazily; use
/// getLookupModules() to get a complete set.
llvm::DenseSet<Module*> LookupModulesCache;

/// \brief Get the set of additional modules that should be checked during
/// name lookup. A module and its imports become visible when instanting a
/// template defined within it.
llvm::DenseSet<Module*> &getLookupModules();

/// \brief Map from the most recent declaration of a namespace to the most
/// recent visible declaration of that namespace.
llvm::DenseMap<NamedDecl*, NamedDecl*> VisibleNamespaceCache;

/// \brief Whether we are in a SFINAE context that is not associated with
/// template instantiation.
///
/// This is used when setting up a SFINAE trap (\c see SFINAETrap) outside
/// of a template instantiation or template argument deduction.
bool InNonInstantiationSFINAEContext;

/// \brief The number of \p CodeSynthesisContexts that are not template
/// instantiations and, therefore, should not be counted as part of the
/// instantiation depth.
///
/// When the instantiation depth reaches the user-configurable limit
/// \p LangOptions::InstantiationDepth we will abort instantiation.
// FIXME: Should we have a similar limit for other forms of synthesis?
unsigned NonInstantiationEntries;

/// \brief The depth of the context stack at the point when the most recent
/// error or warning was produced.
///
/// This value is used to suppress printing of redundant context stacks
/// when there are multiple errors or warnings in the same instantiation.
// FIXME: Does this belong in Sema? It's tough to implement it anywhere else.
unsigned LastEmittedCodeSynthesisContextDepth = 0;

/// \brief The template instantiation callbacks to trace or track
/// instantiations (objects can be chained).
///
/// This callbacks is used to print, trace or track template
/// instantiations as they are being constructed.
std::vector<std::unique_ptr<TemplateInstantiationCallback>>
    TemplateInstCallbacks;

/// \brief The current index into pack expansion arguments that will be
/// used for substitution of parameter packs.
///
/// The pack expansion index will be -1 to indicate that parameter packs
/// should be instantiated as themselves. Otherwise, the index specifies
/// which argument within the parameter pack will be used for substitution.
int ArgumentPackSubstitutionIndex;

/// \brief RAII object used to change the argument pack substitution index
/// within a \c Sema object.
///
/// See \c ArgumentPackSubstitutionIndex for more information.
class ArgumentPackSubstitutionIndexRAII {
  Sema &Self;
  int OldSubstitutionIndex;

public:
  ArgumentPackSubstitutionIndexRAII(Sema &Self, int NewSubstitutionIndex)
    : Self(Self), OldSubstitutionIndex(Self.ArgumentPackSubstitutionIndex) {
    Self.ArgumentPackSubstitutionIndex = NewSubstitutionIndex;
  }

  ~ArgumentPackSubstitutionIndexRAII() {
    Self.ArgumentPackSubstitutionIndex = OldSubstitutionIndex;
  }
};

friend class ArgumentPackSubstitutionRAII;

/// \brief For each declaration that involved template argument deduction, the
/// set of diagnostics that were suppressed during that template argument
/// deduction.
///
/// FIXME: Serialize this structure to the AST file.
typedef llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >
  SuppressedDiagnosticsMap;
SuppressedDiagnosticsMap SuppressedDiagnostics;

/// \brief A stack object to be created when performing template
/// instantiation.
///
/// Construction of an object of type \c InstantiatingTemplate
/// pushes the current instantiation onto the stack of active
/// instantiations. If the size of this stack exceeds the maximum
/// number of recursive template instantiations, construction
/// produces an error and evaluates true.
///
/// Destruction of this object will pop the named instantiation off
/// the stack.
struct InstantiatingTemplate {
  /// \brief Note that we are instantiating a class template,
  /// function template, variable template, alias template,
  /// or a member thereof.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        Decl *Entity,
                        SourceRange InstantiationRange = SourceRange());

  struct ExceptionSpecification {};
  /// \brief Note that we are instantiating an exception specification
  /// of a function template.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionDecl *Entity, ExceptionSpecification,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating a default argument in a
  /// template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateParameter Param, TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are substituting either explicitly-specified or
  /// deduced template arguments during function template argument deduction.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionTemplateDecl *FunctionTemplate,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        CodeSynthesisContext::SynthesisKind Kind,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a class template declaration.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a class template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ClassTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a variable template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        VarTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating a default argument for a function
  /// parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ParmVarDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are substituting prior template arguments into a
  /// non-type parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        NonTypeTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// \brief Note that we are substituting prior template arguments into a
  /// template template parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        TemplateTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// \brief Note that we are checking the default template argument
  /// against the template parameter for a given template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        NamedDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);


  /// \brief Note that we have finished instantiating this template.
  void Clear();

  ~InstantiatingTemplate() { Clear(); }

  /// \brief Determines whether we have exceeded the maximum
  /// recursive template instantiations.
  bool isInvalid() const { return Invalid; }

  /// \brief Determine whether we are already instantiating this
  /// specialization in some surrounding active instantiation.
  bool isAlreadyInstantiating() const { return AlreadyInstantiating; }

private:
  Sema &SemaRef;
  bool Invalid;
  bool AlreadyInstantiating;
  bool CheckInstantiationDepth(SourceLocation PointOfInstantiation,
                               SourceRange InstantiationRange);

  InstantiatingTemplate(
      Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
      SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
      Decl *Entity, NamedDecl *Template = nullptr,
      ArrayRef<TemplateArgument> TemplateArgs = None,
      sema::TemplateDeductionInfo *DeductionInfo = nullptr);

  InstantiatingTemplate(const InstantiatingTemplate&) = delete;

  InstantiatingTemplate&
  operator=(const InstantiatingTemplate&) = delete;
};

void pushCodeSynthesisContext(CodeSynthesisContext Ctx);
void popCodeSynthesisContext();

/// Determine whether we are currently performing template instantiation.
bool inTemplateInstantiation() const {
  return CodeSynthesisContexts.size() > NonInstantiationEntries;
}

void PrintContextStack() {
  if (!CodeSynthesisContexts.empty() &&
      CodeSynthesisContexts.size() != LastEmittedCodeSynthesisContextDepth) {
    PrintInstantiationStack();
    LastEmittedCodeSynthesisContextDepth = CodeSynthesisContexts.size();
  }
  if (PragmaAttributeCurrentTargetDecl)
    PrintPragmaAttributeInstantiationPoint();
}
void PrintInstantiationStack();

void PrintPragmaAttributeInstantiationPoint();

/// \brief Determines whether we are currently in a context where
/// template argument substitution failures are not considered
/// errors.
///
/// \returns An empty \c Optional if we're not in a SFINAE context.
/// Otherwise, contains a pointer that, if non-NULL, contains the nearest
/// template-deduction context object, which can be used to capture
/// diagnostics that will be suppressed.
Optional<sema::TemplateDeductionInfo *> isSFINAEContext() const;

/// \brief Determines whether we are currently in a context that
/// is not evaluated as per C++ [expr] p5.
bool isUnevaluatedContext() const {
  assert(!ExprEvalContexts.empty() &&(static_cast <bool> (!ExprEvalContexts.empty() &&
 "Must be in an expression evaluation context") ? void (0) : __assert_fail
 ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7458, __extension__ __PRETTY_FUNCTION__))
         "Must be in an expression evaluation context")(static_cast <bool> (!ExprEvalContexts.empty() &&
 "Must be in an expression evaluation context") ? void (0) : __assert_fail
 ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7458, __extension__ __PRETTY_FUNCTION__));
  return ExprEvalContexts.back().isUnevaluated();
}

/// \brief RAII class used to determine whether SFINAE has
/// trapped any errors that occur during template argument
/// deduction.
class SFINAETrap {
  Sema &SemaRef;
  unsigned PrevSFINAEErrors;
  bool PrevInNonInstantiationSFINAEContext;
  bool PrevAccessCheckingSFINAE;
  bool PrevLastDiagnosticIgnored;

public:
  explicit SFINAETrap(Sema &SemaRef, bool AccessCheckingSFINAE = false)
    : SemaRef(SemaRef), PrevSFINAEErrors(SemaRef.NumSFINAEErrors),
      PrevInNonInstantiationSFINAEContext(
                                    SemaRef.InNonInstantiationSFINAEContext),
      PrevAccessCheckingSFINAE(SemaRef.AccessCheckingSFINAE),
      PrevLastDiagnosticIgnored(
          SemaRef.getDiagnostics().isLastDiagnosticIgnored())
  {
    if (!SemaRef.isSFINAEContext())
      SemaRef.InNonInstantiationSFINAEContext = true;
    SemaRef.AccessCheckingSFINAE = AccessCheckingSFINAE;
  }

  ~SFINAETrap() {
    SemaRef.NumSFINAEErrors = PrevSFINAEErrors;
    SemaRef.InNonInstantiationSFINAEContext
      = PrevInNonInstantiationSFINAEContext;
    SemaRef.AccessCheckingSFINAE = PrevAccessCheckingSFINAE;
    SemaRef.getDiagnostics().setLastDiagnosticIgnored(
        PrevLastDiagnosticIgnored);
  }

  /// \brief Determine whether any SFINAE errors have been trapped.
  bool hasErrorOccurred() const {
    return SemaRef.NumSFINAEErrors > PrevSFINAEErrors;
  }
};

/// \brief RAII class used to indicate that we are performing provisional
/// semantic analysis to determine the validity of a construct, so
/// typo-correction and diagnostics in the immediate context (not within
/// implicitly-instantiated templates) should be suppressed.
class TentativeAnalysisScope {
  Sema &SemaRef;
  // FIXME: Using a SFINAETrap for this is a hack.
  SFINAETrap Trap;
  bool PrevDisableTypoCorrection;
public:
  explicit TentativeAnalysisScope(Sema &SemaRef)
      : SemaRef(SemaRef), Trap(SemaRef, true),
        PrevDisableTypoCorrection(SemaRef.DisableTypoCorrection) {
    SemaRef.DisableTypoCorrection = true;
  }
  ~TentativeAnalysisScope() {
    SemaRef.DisableTypoCorrection = PrevDisableTypoCorrection;
  }
};

/// \brief The current instantiation scope used to store local
/// variables.
LocalInstantiationScope *CurrentInstantiationScope;

/// \brief Tracks whether we are in a context where typo correction is
/// disabled.
bool DisableTypoCorrection;

/// \brief The number of typos corrected by CorrectTypo.
unsigned TyposCorrected;

typedef llvm::SmallSet<SourceLocation, 2> SrcLocSet;
typedef llvm::DenseMap<IdentifierInfo *, SrcLocSet> IdentifierSourceLocations;

/// \brief A cache containing identifiers for which typo correction failed and
/// their locations, so that repeated attempts to correct an identifier in a
/// given location are ignored if typo correction already failed for it.
IdentifierSourceLocations TypoCorrectionFailures;

/// \brief Worker object for performing CFG-based warnings.
sema::AnalysisBasedWarnings AnalysisWarnings;
threadSafety::BeforeSet *ThreadSafetyDeclCache;

/// \brief An entity for which implicit template instantiation is required.
///
/// The source location associated with the declaration is the first place in
/// the source code where the declaration was "used". It is not necessarily
/// the point of instantiation (which will be either before or after the
/// namespace-scope declaration that triggered this implicit instantiation),
/// However, it is the location that diagnostics should generally refer to,
/// because users will need to know what code triggered the instantiation.
typedef std::pair<ValueDecl *, SourceLocation> PendingImplicitInstantiation;

/// \brief The queue of implicit template instantiations that are required
/// but have not yet been performed.
std::deque<PendingImplicitInstantiation> PendingInstantiations;

class GlobalEagerInstantiationScope {
public:
  GlobalEagerInstantiationScope(Sema &S, bool Enabled)
      : S(S), Enabled(Enabled) {
    if (!Enabled) return;

    SavedPendingInstantiations.swap(S.PendingInstantiations);
    SavedVTableUses.swap(S.VTableUses);
  }

  void perform() {
    if (Enabled) {
      S.DefineUsedVTables();
      S.PerformPendingInstantiations();
    }
  }

  ~GlobalEagerInstantiationScope() {
    if (!Enabled) return;

    // Restore the set of pending vtables.
    assert(S.VTableUses.empty() &&(static_cast <bool> (S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7580, __extension__ __PRETTY_FUNCTION__))
           "VTableUses should be empty before it is discarded.")(static_cast <bool> (S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7580, __extension__ __PRETTY_FUNCTION__));
    S.VTableUses.swap(SavedVTableUses);

    // Restore the set of pending implicit instantiations.
    assert(S.PendingInstantiations.empty() &&(static_cast <bool> (S.PendingInstantiations.empty() &&
 "PendingInstantiations should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7585, __extension__ __PRETTY_FUNCTION__))
           "PendingInstantiations should be empty before it is discarded.")(static_cast <bool> (S.PendingInstantiations.empty() &&
 "PendingInstantiations should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7585, __extension__ __PRETTY_FUNCTION__));
    S.PendingInstantiations.swap(SavedPendingInstantiations);
  }

private:
  Sema &S;
  SmallVector<VTableUse, 16> SavedVTableUses;
  std::deque<PendingImplicitInstantiation> SavedPendingInstantiations;
  bool Enabled;
};

/// \brief The queue of implicit template instantiations that are required
/// and must be performed within the current local scope.
///
/// This queue is only used for member functions of local classes in
/// templates, which must be instantiated in the same scope as their
/// enclosing function, so that they can reference function-local
/// types, static variables, enumerators, etc.
std::deque<PendingImplicitInstantiation> PendingLocalImplicitInstantiations;

class LocalEagerInstantiationScope {
public:
  LocalEagerInstantiationScope(Sema &S) : S(S) {
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

  void perform() { S.PerformPendingInstantiations(/*LocalOnly=*/true); }

  ~LocalEagerInstantiationScope() {
    assert(S.PendingLocalImplicitInstantiations.empty() &&(static_cast <bool> (S.PendingLocalImplicitInstantiations
.empty() && "there shouldn't be any pending local implicit instantiations"
) ? void (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7616, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending local implicit instantiations")(static_cast <bool> (S.PendingLocalImplicitInstantiations
.empty() && "there shouldn't be any pending local implicit instantiations"
) ? void (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7616, __extension__ __PRETTY_FUNCTION__));
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

private:
  Sema &S;
  std::deque<PendingImplicitInstantiation>
      SavedPendingLocalImplicitInstantiations;
};

/// A helper class for building up ExtParameterInfos.
class ExtParameterInfoBuilder {
  SmallVector<FunctionProtoType::ExtParameterInfo, 16> Infos;
  bool HasInteresting = false;

public:
  /// Set the ExtParameterInfo for the parameter at the given index,
  ///
  void set(unsigned index, FunctionProtoType::ExtParameterInfo info) {
    assert(Infos.size() <= index)(static_cast <bool> (Infos.size() <= index) ? void (
0) : __assert_fail ("Infos.size() <= index", "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 7636, __extension__ __PRETTY_FUNCTION__));
    Infos.resize(index);
    Infos.push_back(info);

    if (!HasInteresting)
      HasInteresting = (info != FunctionProtoType::ExtParameterInfo());
  }

  /// Return a pointer (suitable for setting in an ExtProtoInfo) to the
  /// ExtParameterInfo array we've built up.
  const FunctionProtoType::ExtParameterInfo *
  getPointerOrNull(unsigned numParams) {
    if (!HasInteresting) return nullptr;
    Infos.resize(numParams);
    return Infos.data();
  }
};

void PerformPendingInstantiations(bool LocalOnly = false);

TypeSourceInfo *SubstType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity,
                          bool AllowDeducedTST = false);

QualType SubstType(QualType T,
                   const MultiLevelTemplateArgumentList &TemplateArgs,
                   SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstType(TypeLoc TL,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstFunctionDeclType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                                      SourceLocation Loc,
                                      DeclarationName Entity,
                                      CXXRecordDecl *ThisContext,
                                      unsigned ThisTypeQuals);
void SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
                        const MultiLevelTemplateArgumentList &Args);
bool SubstExceptionSpec(SourceLocation Loc,
                        FunctionProtoType::ExceptionSpecInfo &ESI,
                        SmallVectorImpl<QualType> &ExceptionStorage,
                        const MultiLevelTemplateArgumentList &Args);
ParmVarDecl *SubstParmVarDecl(ParmVarDecl *D,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                              int indexAdjustment,
                              Optional<unsigned> NumExpansions,
                              bool ExpectParameterPack);
bool SubstParmTypes(SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
                    const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
                    const MultiLevelTemplateArgumentList &TemplateArgs,
                    SmallVectorImpl<QualType> &ParamTypes,
                    SmallVectorImpl<ParmVarDecl *> *OutParams,
                    ExtParameterInfoBuilder &ParamInfos);
ExprResult SubstExpr(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

/// \brief Substitute the given template arguments into a list of
/// expressions, expanding pack expansions if required.
///
/// \param Exprs The list of expressions to substitute into.
///
/// \param IsCall Whether this is some form of call, in which case
/// default arguments will be dropped.
///
/// \param TemplateArgs The set of template arguments to substitute.
///
/// \param Outputs Will receive all of the substituted arguments.
///
/// \returns true if an error occurred, false otherwise.
bool SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall,
                const MultiLevelTemplateArgumentList &TemplateArgs,
                SmallVectorImpl<Expr *> &Outputs);

StmtResult SubstStmt(Stmt *S,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

Decl *SubstDecl(Decl *D, DeclContext *Owner,
                const MultiLevelTemplateArgumentList &TemplateArgs);

ExprResult SubstInitializer(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     bool CXXDirectInit);

bool
SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
                    CXXRecordDecl *Pattern,
                    const MultiLevelTemplateArgumentList &TemplateArgs);

bool
InstantiateClass(SourceLocation PointOfInstantiation,
                 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
                 const MultiLevelTemplateArgumentList &TemplateArgs,
                 TemplateSpecializationKind TSK,
                 bool Complain = true);

bool InstantiateEnum(SourceLocation PointOfInstantiation,
                     EnumDecl *Instantiation, EnumDecl *Pattern,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     TemplateSpecializationKind TSK);

bool InstantiateInClassInitializer(
    SourceLocation PointOfInstantiation, FieldDecl *Instantiation,
    FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs);

struct LateInstantiatedAttribute {
  const Attr *TmplAttr;
  LocalInstantiationScope *Scope;
  Decl *NewDecl;

  LateInstantiatedAttribute(const Attr *A, LocalInstantiationScope *S,
                            Decl *D)
    : TmplAttr(A), Scope(S), NewDecl(D)
  { }
};
typedef SmallVector<LateInstantiatedAttribute, 16> LateInstantiatedAttrVec;

void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
                      const Decl *Pattern, Decl *Inst,
                      LateInstantiatedAttrVec *LateAttrs = nullptr,
                      LocalInstantiationScope *OuterMostScope = nullptr);

void
InstantiateAttrsForDecl(const MultiLevelTemplateArgumentList &TemplateArgs,
                        const Decl *Pattern, Decl *Inst,
                        LateInstantiatedAttrVec *LateAttrs = nullptr,
                        LocalInstantiationScope *OuterMostScope = nullptr);

bool usesPartialOrExplicitSpecialization(
    SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec);

bool
InstantiateClassTemplateSpecialization(SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                         TemplateSpecializationKind TSK,
                         bool Complain = true);

void InstantiateClassMembers(SourceLocation PointOfInstantiation,
                             CXXRecordDecl *Instantiation,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                             TemplateSpecializationKind TSK);

void InstantiateClassTemplateSpecializationMembers(
                                        SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                                              TemplateSpecializationKind TSK);

NestedNameSpecifierLoc
SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
                         const MultiLevelTemplateArgumentList &TemplateArgs);

DeclarationNameInfo
SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
                         const MultiLevelTemplateArgumentList &TemplateArgs);
TemplateName
SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, TemplateName Name,
                  SourceLocation Loc,
                  const MultiLevelTemplateArgumentList &TemplateArgs);
bool Subst(const TemplateArgumentLoc *Args, unsigned NumArgs,
           TemplateArgumentListInfo &Result,
           const MultiLevelTemplateArgumentList &TemplateArgs);

void InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
                              FunctionDecl *Function);
FunctionDecl *InstantiateFunctionDeclaration(FunctionTemplateDecl *FTD,
                                             const TemplateArgumentList *Args,
                                             SourceLocation Loc);
void InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
                                   FunctionDecl *Function,
                                   bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);
VarTemplateSpecializationDecl *BuildVarTemplateInstantiation(
    VarTemplateDecl *VarTemplate, VarDecl *FromVar,
    const TemplateArgumentList &TemplateArgList,
    const TemplateArgumentListInfo &TemplateArgsInfo,
    SmallVectorImpl<TemplateArgument> &Converted,
    SourceLocation PointOfInstantiation, void *InsertPos,
    LateInstantiatedAttrVec *LateAttrs = nullptr,
    LocalInstantiationScope *StartingScope = nullptr);
VarTemplateSpecializationDecl *CompleteVarTemplateSpecializationDecl(
    VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void
BuildVariableInstantiation(VarDecl *NewVar, VarDecl *OldVar,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                           LateInstantiatedAttrVec *LateAttrs,
                           DeclContext *Owner,
                           LocalInstantiationScope *StartingScope,
                           bool InstantiatingVarTemplate = false);
void InstantiateVariableInitializer(
    VarDecl *Var, VarDecl *OldVar,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
                                   VarDecl *Var, bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);

void InstantiateMemInitializers(CXXConstructorDecl *New,
                                const CXXConstructorDecl *Tmpl,
                          const MultiLevelTemplateArgumentList &TemplateArgs);

NamedDecl *FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
                        const MultiLevelTemplateArgumentList &TemplateArgs,
                        bool FindingInstantiatedContext = false);
DeclContext *FindInstantiatedContext(SourceLocation Loc, DeclContext *DC,
                        const MultiLevelTemplateArgumentList &TemplateArgs);

// Objective-C declarations.
enum ObjCContainerKind {
  OCK_None = -1,
  OCK_Interface = 0,
  OCK_Protocol,
  OCK_Category,
  OCK_ClassExtension,
  OCK_Implementation,
  OCK_CategoryImplementation
};
ObjCContainerKind getObjCContainerKind() const;

DeclResult actOnObjCTypeParam(Scope *S,
                              ObjCTypeParamVariance variance,
                              SourceLocation varianceLoc,
                              unsigned index,
                              IdentifierInfo *paramName,
                              SourceLocation paramLoc,
                              SourceLocation colonLoc,
                              ParsedType typeBound);

ObjCTypeParamList *actOnObjCTypeParamList(Scope *S, SourceLocation lAngleLoc,
                                          ArrayRef<Decl *> typeParams,
                                          SourceLocation rAngleLoc);
void popObjCTypeParamList(Scope *S, ObjCTypeParamList *typeParamList);

Decl *ActOnStartClassInterface(Scope *S,
                               SourceLocation AtInterfaceLoc,
                               IdentifierInfo *ClassName,
                               SourceLocation ClassLoc,
                               ObjCTypeParamList *typeParamList,
                               IdentifierInfo *SuperName,
                               SourceLocation SuperLoc,
                               ArrayRef<ParsedType> SuperTypeArgs,
                               SourceRange SuperTypeArgsRange,
                               Decl * const *ProtoRefs,
                               unsigned NumProtoRefs,
                               const SourceLocation *ProtoLocs,
                               SourceLocation EndProtoLoc,
                               AttributeList *AttrList);

void ActOnSuperClassOfClassInterface(Scope *S,
                                     SourceLocation AtInterfaceLoc,
                                     ObjCInterfaceDecl *IDecl,
                                     IdentifierInfo *ClassName,
                                     SourceLocation ClassLoc,
                                     IdentifierInfo *SuperName,
                                     SourceLocation SuperLoc,
                                     ArrayRef<ParsedType> SuperTypeArgs,
                                     SourceRange SuperTypeArgsRange);

void ActOnTypedefedProtocols(SmallVectorImpl<Decl *> &ProtocolRefs,
                             SmallVectorImpl<SourceLocation> &ProtocolLocs,
                             IdentifierInfo *SuperName,
                             SourceLocation SuperLoc);

Decl *ActOnCompatibilityAlias(
                  SourceLocation AtCompatibilityAliasLoc,
                  IdentifierInfo *AliasName,  SourceLocation AliasLocation,
                  IdentifierInfo *ClassName, SourceLocation ClassLocation);

bool CheckForwardProtocolDeclarationForCircularDependency(
  IdentifierInfo *PName,
  SourceLocation &PLoc, SourceLocation PrevLoc,
  const ObjCList<ObjCProtocolDecl> &PList);

Decl *ActOnStartProtocolInterface(
                  SourceLocation AtProtoInterfaceLoc,
                  IdentifierInfo *ProtocolName, SourceLocation ProtocolLoc,
                  Decl * const *ProtoRefNames, unsigned NumProtoRefs,
                  const SourceLocation *ProtoLocs,
                  SourceLocation EndProtoLoc,
                  AttributeList *AttrList);

Decl *ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
                                  IdentifierInfo *ClassName,
                                  SourceLocation ClassLoc,
                                  ObjCTypeParamList *typeParamList,
                                  IdentifierInfo *CategoryName,
                                  SourceLocation CategoryLoc,
                                  Decl * const *ProtoRefs,
                                  unsigned NumProtoRefs,
                                  const SourceLocation *ProtoLocs,
                                  SourceLocation EndProtoLoc,
                                  AttributeList *AttrList);

Decl *ActOnStartClassImplementation(
                  SourceLocation AtClassImplLoc,
                  IdentifierInfo *ClassName, SourceLocation ClassLoc,
                  IdentifierInfo *SuperClassname,
                  SourceLocation SuperClassLoc);

Decl *ActOnStartCategoryImplementation(SourceLocation AtCatImplLoc,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassLoc,
                                       IdentifierInfo *CatName,
                                       SourceLocation CatLoc);

DeclGroupPtrTy ActOnFinishObjCImplementation(Decl *ObjCImpDecl,
                                             ArrayRef<Decl *> Decls);

DeclGroupPtrTy ActOnForwardClassDeclaration(SourceLocation Loc,
                 IdentifierInfo **IdentList,
                 SourceLocation *IdentLocs,
                 ArrayRef<ObjCTypeParamList *> TypeParamLists,
                 unsigned NumElts);

DeclGroupPtrTy ActOnForwardProtocolDeclaration(SourceLocation AtProtoclLoc,
                                      ArrayRef<IdentifierLocPair> IdentList,
                                      AttributeList *attrList);

void FindProtocolDeclaration(bool WarnOnDeclarations, bool ForObjCContainer,
                             ArrayRef<IdentifierLocPair> ProtocolId,
                             SmallVectorImpl<Decl *> &Protocols);

void DiagnoseTypeArgsAndProtocols(IdentifierInfo *ProtocolId,
                                  SourceLocation ProtocolLoc,
                                  IdentifierInfo *TypeArgId,
                                  SourceLocation TypeArgLoc,
                                  bool SelectProtocolFirst = false);

/// Given a list of identifiers (and their locations), resolve the
/// names to either Objective-C protocol qualifiers or type
/// arguments, as appropriate.
void actOnObjCTypeArgsOrProtocolQualifiers(
       Scope *S,
       ParsedType baseType,
       SourceLocation lAngleLoc,
       ArrayRef<IdentifierInfo *> identifiers,
       ArrayRef<SourceLocation> identifierLocs,
       SourceLocation rAngleLoc,
       SourceLocation &typeArgsLAngleLoc,
       SmallVectorImpl<ParsedType> &typeArgs,
       SourceLocation &typeArgsRAngleLoc,
       SourceLocation &protocolLAngleLoc,
       SmallVectorImpl<Decl *> &protocols,
       SourceLocation &protocolRAngleLoc,
       bool warnOnIncompleteProtocols);

/// Build a an Objective-C protocol-qualified 'id' type where no
/// base type was specified.
TypeResult actOnObjCProtocolQualifierType(
             SourceLocation lAngleLoc,
             ArrayRef<Decl *> protocols,
             ArrayRef<SourceLocation> protocolLocs,
             SourceLocation rAngleLoc);

/// Build a specialized and/or protocol-qualified Objective-C type.
TypeResult actOnObjCTypeArgsAndProtocolQualifiers(
             Scope *S,
             SourceLocation Loc,
             ParsedType BaseType,
             SourceLocation TypeArgsLAngleLoc,
             ArrayRef<ParsedType> TypeArgs,
             SourceLocation TypeArgsRAngleLoc,
             SourceLocation ProtocolLAngleLoc,
             ArrayRef<Decl *> Protocols,
             ArrayRef<SourceLocation> ProtocolLocs,
             SourceLocation ProtocolRAngleLoc);

/// Build an Objective-C type parameter type.
QualType BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
                                SourceLocation ProtocolLAngleLoc,
                                ArrayRef<ObjCProtocolDecl *> Protocols,
                                ArrayRef<SourceLocation> ProtocolLocs,
                                SourceLocation ProtocolRAngleLoc,
                                bool FailOnError = false);

/// Build an Objective-C object pointer type.
QualType BuildObjCObjectType(QualType BaseType,
                             SourceLocation Loc,
                             SourceLocation TypeArgsLAngleLoc,
                             ArrayRef<TypeSourceInfo *> TypeArgs,
                             SourceLocation TypeArgsRAngleLoc,
                             SourceLocation ProtocolLAngleLoc,
                             ArrayRef<ObjCProtocolDecl *> Protocols,
                             ArrayRef<SourceLocation> ProtocolLocs,
                             SourceLocation ProtocolRAngleLoc,
                             bool FailOnError = false);

/// Check the application of the Objective-C '__kindof' qualifier to
/// the given type.
bool checkObjCKindOfType(QualType &type, SourceLocation loc);

/// Ensure attributes are consistent with type.
/// \param [in, out] Attributes The attributes to check; they will
/// be modified to be consistent with \p PropertyTy.
void CheckObjCPropertyAttributes(Decl *PropertyPtrTy,
                                 SourceLocation Loc,
                                 unsigned &Attributes,
                                 bool propertyInPrimaryClass);

/// Process the specified property declaration and create decls for the
/// setters and getters as needed.
/// \param property The property declaration being processed
void ProcessPropertyDecl(ObjCPropertyDecl *property);


void DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
                              ObjCPropertyDecl *SuperProperty,
                              const IdentifierInfo *Name,
                              bool OverridingProtocolProperty);

void DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
                                      ObjCInterfaceDecl *ID);

Decl *ActOnAtEnd(Scope *S, SourceRange AtEnd,
                 ArrayRef<Decl *> allMethods = None,
                 ArrayRef<DeclGroupPtrTy> allTUVars = None);

Decl *ActOnProperty(Scope *S, SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD, ObjCDeclSpec &ODS,
                    Selector GetterSel, Selector SetterSel,
                    tok::ObjCKeywordKind MethodImplKind,
                    DeclContext *lexicalDC = nullptr);

Decl *ActOnPropertyImplDecl(Scope *S,
                            SourceLocation AtLoc,
                            SourceLocation PropertyLoc,
                            bool ImplKind,
                            IdentifierInfo *PropertyId,
                            IdentifierInfo *PropertyIvar,
                            SourceLocation PropertyIvarLoc,
                            ObjCPropertyQueryKind QueryKind);

enum ObjCSpecialMethodKind {
  OSMK_None,
  OSMK_Alloc,
  OSMK_New,
  OSMK_Copy,
  OSMK_RetainingInit,
  OSMK_NonRetainingInit
};

struct ObjCArgInfo {
  IdentifierInfo *Name;
  SourceLocation NameLoc;
  // The Type is null if no type was specified, and the DeclSpec is invalid
  // in this case.
  ParsedType Type;
  ObjCDeclSpec DeclSpec;

  /// ArgAttrs - Attribute list for this argument.
  AttributeList *ArgAttrs;
};

Decl *ActOnMethodDeclaration(
  Scope *S,
  SourceLocation BeginLoc, // location of the + or -.
  SourceLocation EndLoc,   // location of the ; or {.
  tok::TokenKind MethodType,
  ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
  ArrayRef<SourceLocation> SelectorLocs, Selector Sel,
  // optional arguments. The number of types/arguments is obtained
  // from the Sel.getNumArgs().
  ObjCArgInfo *ArgInfo,
  DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
  AttributeList *AttrList, tok::ObjCKeywordKind MethodImplKind,
  bool isVariadic, bool MethodDefinition);

ObjCMethodDecl *LookupMethodInQualifiedType(Selector Sel,
                                            const ObjCObjectPointerType *OPT,
                                            bool IsInstance);
ObjCMethodDecl *LookupMethodInObjectType(Selector Sel, QualType Ty,
                                         bool IsInstance);

bool CheckARCMethodDecl(ObjCMethodDecl *method);
bool inferObjCARCLifetime(ValueDecl *decl);

ExprResult
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
                          Expr *BaseExpr,
                          SourceLocation OpLoc,
                          DeclarationName MemberName,
                          SourceLocation MemberLoc,
                          SourceLocation SuperLoc, QualType SuperType,
                          bool Super);

ExprResult
ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
                          IdentifierInfo &propertyName,
                          SourceLocation receiverNameLoc,
                          SourceLocation propertyNameLoc);

ObjCMethodDecl *tryCaptureObjCSelf(SourceLocation Loc);

/// \brief Describes the kind of message expression indicated by a message
/// send that starts with an identifier.
enum ObjCMessageKind {
  /// \brief The message is sent to 'super'.
  ObjCSuperMessage,
  /// \brief The message is an instance message.
  ObjCInstanceMessage,
  /// \brief The message is a class message, and the identifier is a type
  /// name.
  ObjCClassMessage
};

ObjCMessageKind getObjCMessageKind(Scope *S,
                                   IdentifierInfo *Name,
                                   SourceLocation NameLoc,
                                   bool IsSuper,
                                   bool HasTrailingDot,
                                   ParsedType &ReceiverType);

ExprResult ActOnSuperMessage(Scope *S, SourceLocation SuperLoc,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
                             QualType ReceiverType,
                             SourceLocation SuperLoc,
                             Selector Sel,
                             ObjCMethodDecl *Method,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args,
                             bool isImplicit = false);

ExprResult BuildClassMessageImplicit(QualType ReceiverType,
                                     bool isSuperReceiver,
                                     SourceLocation Loc,
                                     Selector Sel,
                                     ObjCMethodDecl *Method,
                                     MultiExprArg Args);

ExprResult ActOnClassMessage(Scope *S,
                             ParsedType Receiver,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildInstanceMessage(Expr *Receiver,
                                QualType ReceiverType,
                                SourceLocation SuperLoc,
                                Selector Sel,
                                ObjCMethodDecl *Method,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args,
                                bool isImplicit = false);

ExprResult BuildInstanceMessageImplicit(Expr *Receiver,
                                        QualType ReceiverType,
                                        SourceLocation Loc,
                                        Selector Sel,
                                        ObjCMethodDecl *Method,
                                        MultiExprArg Args);

ExprResult ActOnInstanceMessage(Scope *S,
                                Expr *Receiver,
                                Selector Sel,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args);

ExprResult BuildObjCBridgedCast(SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                TypeSourceInfo *TSInfo,
                                Expr *SubExpr);

ExprResult ActOnObjCBridgedCast(Scope *S,
                                SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                ParsedType Type,
                                SourceLocation RParenLoc,
                                Expr *SubExpr);

void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr);

void CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr);

bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
                                   CastKind &Kind);

bool checkObjCBridgeRelatedComponents(SourceLocation Loc,
                                      QualType DestType, QualType SrcType,
                                      ObjCInterfaceDecl *&RelatedClass,
                                      ObjCMethodDecl *&ClassMethod,
                                      ObjCMethodDecl *&InstanceMethod,
                                      TypedefNameDecl *&TDNDecl,
                                      bool CfToNs, bool Diagnose = true);

bool CheckObjCBridgeRelatedConversions(SourceLocation Loc,
                                       QualType DestType, QualType SrcType,
                                       Expr *&SrcExpr, bool Diagnose = true);

bool ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&SrcExpr,
                                        bool Diagnose = true);

bool checkInitMethod(ObjCMethodDecl *method, QualType receiverTypeIfCall);

/// \brief Check whether the given new method is a valid override of the
/// given overridden method, and set any properties that should be inherited.
void CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
                             const ObjCMethodDecl *Overridden);

/// \brief Describes the compatibility of a result type with its method.
enum ResultTypeCompatibilityKind {
  RTC_Compatible,
  RTC_Incompatible,
  RTC_Unknown
};

void CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod,
                              ObjCInterfaceDecl *CurrentClass,
                              ResultTypeCompatibilityKind RTC);

enum PragmaOptionsAlignKind {
  POAK_Native,  // #pragma options align=native
  POAK_Natural, // #pragma options align=natural
  POAK_Packed,  // #pragma options align=packed
  POAK_Power,   // #pragma options align=power
  POAK_Mac68k,  // #pragma options align=mac68k
  POAK_Reset    // #pragma options align=reset
};

/// ActOnPragmaClangSection - Called on well formed \#pragma clang section
void ActOnPragmaClangSection(SourceLocation PragmaLoc,
                             PragmaClangSectionAction Action,
                             PragmaClangSectionKind SecKind, StringRef SecName);

/// ActOnPragmaOptionsAlign - Called on well formed \#pragma options align.
void ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
                             SourceLocation PragmaLoc);

/// ActOnPragmaPack - Called on well formed \#pragma pack(...).
void ActOnPragmaPack(SourceLocation PragmaLoc, PragmaMsStackAction Action,
                     StringRef SlotLabel, Expr *Alignment);

enum class PragmaPackDiagnoseKind {
  NonDefaultStateAtInclude,
  ChangedStateAtExit
};

void DiagnoseNonDefaultPragmaPack(PragmaPackDiagnoseKind Kind,
                                  SourceLocation IncludeLoc);
void DiagnoseUnterminatedPragmaPack();

/// ActOnPragmaMSStruct - Called on well formed \#pragma ms_struct [on|off].
void ActOnPragmaMSStruct(PragmaMSStructKind Kind);

/// ActOnPragmaMSComment - Called on well formed
/// \#pragma comment(kind, "arg").
void ActOnPragmaMSComment(SourceLocation CommentLoc, PragmaMSCommentKind Kind,
                          StringRef Arg);

/// ActOnPragmaMSPointersToMembers - called on well formed \#pragma
/// pointers_to_members(representation method[, general purpose
/// representation]).
void ActOnPragmaMSPointersToMembers(
    LangOptions::PragmaMSPointersToMembersKind Kind,
    SourceLocation PragmaLoc);

/// \brief Called on well formed \#pragma vtordisp().
void ActOnPragmaMSVtorDisp(PragmaMsStackAction Action,
                           SourceLocation PragmaLoc,
                           MSVtorDispAttr::Mode Value);

enum PragmaSectionKind {
  PSK_DataSeg,
  PSK_BSSSeg,
  PSK_ConstSeg,
  PSK_CodeSeg,
};

bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  DeclaratorDecl *TheDecl);
bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  SourceLocation PragmaSectionLocation);

/// \brief Called on well formed \#pragma bss_seg/data_seg/const_seg/code_seg.
void ActOnPragmaMSSeg(SourceLocation PragmaLocation,
                      PragmaMsStackAction Action,
                      llvm::StringRef StackSlotLabel,
                      StringLiteral *SegmentName,
                      llvm::StringRef PragmaName);

/// \brief Called on well formed \#pragma section().
void ActOnPragmaMSSection(SourceLocation PragmaLocation,
                          int SectionFlags, StringLiteral *SegmentName);

/// \brief Called on well-formed \#pragma init_seg().
void ActOnPragmaMSInitSeg(SourceLocation PragmaLocation,
                          StringLiteral *SegmentName);

/// \brief Called on #pragma clang __debug dump II
void ActOnPragmaDump(Scope *S, SourceLocation Loc, IdentifierInfo *II);

/// ActOnPragmaDetectMismatch - Call on well-formed \#pragma detect_mismatch
void ActOnPragmaDetectMismatch(SourceLocation Loc, StringRef Name,
                               StringRef Value);

/// ActOnPragmaUnused - Called on well-formed '\#pragma unused'.
void ActOnPragmaUnused(const Token &Identifier,
                       Scope *curScope,
                       SourceLocation PragmaLoc);

/// ActOnPragmaVisibility - Called on well formed \#pragma GCC visibility... .
void ActOnPragmaVisibility(const IdentifierInfo* VisType,
                           SourceLocation PragmaLoc);

NamedDecl *DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
                               SourceLocation Loc);
void DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W);

/// ActOnPragmaWeakID - Called on well formed \#pragma weak ident.
void ActOnPragmaWeakID(IdentifierInfo* WeakName,
                       SourceLocation PragmaLoc,
                       SourceLocation WeakNameLoc);

/// ActOnPragmaRedefineExtname - Called on well formed
/// \#pragma redefine_extname oldname newname.
void ActOnPragmaRedefineExtname(IdentifierInfo* WeakName,
                                IdentifierInfo* AliasName,
                                SourceLocation PragmaLoc,
                                SourceLocation WeakNameLoc,
                                SourceLocation AliasNameLoc);

/// ActOnPragmaWeakAlias - Called on well formed \#pragma weak ident = ident.
void ActOnPragmaWeakAlias(IdentifierInfo* WeakName,
                          IdentifierInfo* AliasName,
                          SourceLocation PragmaLoc,
                          SourceLocation WeakNameLoc,
                          SourceLocation AliasNameLoc);

/// ActOnPragmaFPContract - Called on well formed
/// \#pragma {STDC,OPENCL} FP_CONTRACT and
/// \#pragma clang fp contract
void ActOnPragmaFPContract(LangOptions::FPContractModeKind FPC);

/// AddAlignmentAttributesForRecord - Adds any needed alignment attributes to
/// a the record decl, to handle '\#pragma pack' and '\#pragma options align'.
void AddAlignmentAttributesForRecord(RecordDecl *RD);

/// AddMsStructLayoutForRecord - Adds ms_struct layout attribute to record.
void AddMsStructLayoutForRecord(RecordDecl *RD);

/// FreePackedContext - Deallocate and null out PackContext.
void FreePackedContext();

/// PushNamespaceVisibilityAttr - Note that we've entered a
/// namespace with a visibility attribute.
void PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
                                 SourceLocation Loc);

/// AddPushedVisibilityAttribute - If '\#pragma GCC visibility' was used,
/// add an appropriate visibility attribute.
void AddPushedVisibilityAttribute(Decl *RD);

/// PopPragmaVisibility - Pop the top element of the visibility stack; used
/// for '\#pragma GCC visibility' and visibility attributes on namespaces.
void PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc);

/// FreeVisContext - Deallocate and null out VisContext.
void FreeVisContext();

/// AddCFAuditedAttribute - Check whether we're currently within
/// '\#pragma clang arc_cf_code_audited' and, if so, consider adding
/// the appropriate attribute.
void AddCFAuditedAttribute(Decl *D);

/// \brief Called on well-formed '\#pragma clang attribute push'.
void ActOnPragmaAttributePush(AttributeList &Attribute,
                              SourceLocation PragmaLoc,
                              attr::ParsedSubjectMatchRuleSet Rules);

/// \brief Called on well-formed '\#pragma clang attribute pop'.
void ActOnPragmaAttributePop(SourceLocation PragmaLoc);

/// \brief Adds the attributes that have been specified using the
/// '\#pragma clang attribute push' directives to the given declaration.
void AddPragmaAttributes(Scope *S, Decl *D);

void DiagnoseUnterminatedPragmaAttribute();

/// \brief Called on well formed \#pragma clang optimize.
void ActOnPragmaOptimize(bool On, SourceLocation PragmaLoc);

/// \brief Get the location for the currently active "\#pragma clang optimize
/// off". If this location is invalid, then the state of the pragma is "on".
SourceLocation getOptimizeOffPragmaLocation() const {
  return OptimizeOffPragmaLocation;
}

/// \brief Only called on function definitions; if there is a pragma in scope
/// with the effect of a range-based optnone, consider marking the function
/// with attribute optnone.
void AddRangeBasedOptnone(FunctionDecl *FD);

/// \brief Adds the 'optnone' attribute to the function declaration if there
/// are no conflicts; Loc represents the location causing the 'optnone'
/// attribute to be added (usually because of a pragma).
void AddOptnoneAttributeIfNoConflicts(FunctionDecl *FD, SourceLocation Loc);

/// AddAlignedAttr - Adds an aligned attribute to a particular declaration.
void AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
                    unsigned SpellingListIndex, bool IsPackExpansion);
void AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *T,
                    unsigned SpellingListIndex, bool IsPackExpansion);

/// AddAssumeAlignedAttr - Adds an assume_aligned attribute to a particular
/// declaration.
void AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E, Expr *OE,
                          unsigned SpellingListIndex);

/// AddAllocAlignAttr - Adds an alloc_align attribute to a particular
/// declaration.
void AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
                       unsigned SpellingListIndex);

/// AddAlignValueAttr - Adds an align_value attribute to a particular
/// declaration.
void AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
                       unsigned SpellingListIndex);

/// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
/// declaration.
void AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
                         Expr *MinBlocks, unsigned SpellingListIndex);

/// AddModeAttr - Adds a mode attribute to a particular declaration.
void AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
                 unsigned SpellingListIndex, bool InInstantiation = false);

void AddParameterABIAttr(SourceRange AttrRange, Decl *D,
                         ParameterABI ABI, unsigned SpellingListIndex);

void AddNSConsumedAttr(SourceRange AttrRange, Decl *D,
                       unsigned SpellingListIndex, bool isNSConsumed,
                       bool isTemplateInstantiation);

bool checkNSReturnsRetainedReturnType(SourceLocation loc, QualType type);

//===--------------------------------------------------------------------===//
// C++ Coroutines TS
//
bool ActOnCoroutineBodyStart(Scope *S, SourceLocation KwLoc,
                             StringRef Keyword);
ExprResult ActOnCoawaitExpr(Scope *S, SourceLocation KwLoc, Expr *E);
ExprResult ActOnCoyieldExpr(Scope *S, SourceLocation KwLoc, Expr *E);
StmtResult ActOnCoreturnStmt(Scope *S, SourceLocation KwLoc, Expr *E);

ExprResult BuildResolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                    bool IsImplicit = false);
ExprResult BuildUnresolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                      UnresolvedLookupExpr* Lookup);
ExprResult BuildCoyieldExpr(SourceLocation KwLoc, Expr *E);
StmtResult BuildCoreturnStmt(SourceLocation KwLoc, Expr *E,
                             bool IsImplicit = false);
StmtResult BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs);
bool buildCoroutineParameterMoves(SourceLocation Loc);
VarDecl *buildCoroutinePromise(SourceLocation Loc);
void CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body);

//===--------------------------------------------------------------------===//
// OpenCL extensions.
//
8517private:
std::string CurrOpenCLExtension;
/// Extensions required by an OpenCL type.
llvm::DenseMap<const Type*, std::set<std::string>> OpenCLTypeExtMap;
/// Extensions required by an OpenCL declaration.
llvm::DenseMap<const Decl*, std::set<std::string>> OpenCLDeclExtMap;
8523public:
llvm::StringRef getCurrentOpenCLExtension() const {
  return CurrOpenCLExtension;
}
void setCurrentOpenCLExtension(llvm::StringRef Ext) {
  CurrOpenCLExtension = Ext;
}

/// \brief Set OpenCL extensions for a type which can only be used when these
/// OpenCL extensions are enabled. If \p Exts is empty, do nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForType(QualType T, llvm::StringRef Exts);

/// \brief Set OpenCL extensions for a declaration which can only be
/// used when these OpenCL extensions are enabled. If \p Exts is empty, do
/// nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForDecl(Decl *FD, llvm::StringRef Exts);

/// \brief Set current OpenCL extensions for a type which can only be used
/// when these OpenCL extensions are enabled. If current OpenCL extension is
/// empty, do nothing.
void setCurrentOpenCLExtensionForType(QualType T);

/// \brief Set current OpenCL extensions for a declaration which
/// can only be used when these OpenCL extensions are enabled. If current
/// OpenCL extension is empty, do nothing.
void setCurrentOpenCLExtensionForDecl(Decl *FD);

bool isOpenCLDisabledDecl(Decl *FD);

/// \brief Check if type \p T corresponding to declaration specifier \p DS
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType T);

/// \brief Check if declaration \p D used by expression \p E
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledDecl(const NamedDecl &D, const Expr &E);

//===--------------------------------------------------------------------===//
// OpenMP directives and clauses.
//
8569private:
void *VarDataSharingAttributesStack;
/// Set to true inside '#pragma omp declare target' region.
bool IsInOpenMPDeclareTargetContext = false;
/// \brief Initialization of data-sharing attributes stack.
void InitDataSharingAttributesStack();
void DestroyDataSharingAttributesStack();
ExprResult
VerifyPositiveIntegerConstantInClause(Expr *Op, OpenMPClauseKind CKind,
                                      bool StrictlyPositive = true);
/// Returns OpenMP nesting level for current directive.
unsigned getOpenMPNestingLevel() const;

/// Adjusts the function scopes index for the target-based regions.
void adjustOpenMPTargetScopeIndex(unsigned &FunctionScopesIndex,
                                  unsigned Level) const;

/// Push new OpenMP function region for non-capturing function.
void pushOpenMPFunctionRegion();

/// Pop OpenMP function region for non-capturing function.
void popOpenMPFunctionRegion(const sema::FunctionScopeInfo *OldFSI);

/// Checks if a type or a declaration is disabled due to the owning extension
/// being disabled, and emits diagnostic messages if it is disabled.
/// \param D type or declaration to be checked.
/// \param DiagLoc source location for the diagnostic message.
/// \param DiagInfo information to be emitted for the diagnostic message.
/// \param SrcRange source range of the declaration.
/// \param Map maps type or declaration to the extensions.
/// \param Selector selects diagnostic message: 0 for type and 1 for
///        declaration.
/// \return true if the type or declaration is disabled.
template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
bool checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc, DiagInfoT DiagInfo,
                                   MapT &Map, unsigned Selector = 0,
                                   SourceRange SrcRange = SourceRange());

8607public:
/// \brief Return true if the provided declaration \a VD should be captured by
/// reference.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool IsOpenMPCapturedByRef(ValueDecl *D, unsigned Level);

/// \brief Check if the specified variable is used in one of the private
/// clauses (private, firstprivate, lastprivate, reduction etc.) in OpenMP
/// constructs.
VarDecl *IsOpenMPCapturedDecl(ValueDecl *D);
ExprResult getOpenMPCapturedExpr(VarDecl *Capture, ExprValueKind VK,
                                 ExprObjectKind OK, SourceLocation Loc);

/// \brief Check if the specified variable is used in 'private' clause.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPPrivateDecl(ValueDecl *D, unsigned Level);

/// Sets OpenMP capture kind (OMPC_private, OMPC_firstprivate, OMPC_map etc.)
/// for \p FD based on DSA for the provided corresponding captured declaration
/// \p D.
void setOpenMPCaptureKind(FieldDecl *FD, ValueDecl *D, unsigned Level);

/// \brief Check if the specified variable is captured  by 'target' directive.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPTargetCapturedDecl(ValueDecl *D, unsigned Level);

ExprResult PerformOpenMPImplicitIntegerConversion(SourceLocation OpLoc,
                                                  Expr *Op);
/// \brief Called on start of new data sharing attribute block.
void StartOpenMPDSABlock(OpenMPDirectiveKind K,
                         const DeclarationNameInfo &DirName, Scope *CurScope,
                         SourceLocation Loc);
/// \brief Start analysis of clauses.
void StartOpenMPClause(OpenMPClauseKind K);
/// \brief End analysis of clauses.
void EndOpenMPClause();
/// \brief Called on end of data sharing attribute block.
void EndOpenMPDSABlock(Stmt *CurDirective);

/// \brief Check if the current region is an OpenMP loop region and if it is,
/// mark loop control variable, used in \p Init for loop initialization, as
/// private by default.
/// \param Init First part of the for loop.
void ActOnOpenMPLoopInitialization(SourceLocation ForLoc, Stmt *Init);

// OpenMP directives and clauses.
/// \brief Called on correct id-expression from the '#pragma omp
/// threadprivate'.
ExprResult ActOnOpenMPIdExpression(Scope *CurScope,
                                   CXXScopeSpec &ScopeSpec,
                                   const DeclarationNameInfo &Id);
/// \brief Called on well-formed '#pragma omp threadprivate'.
DeclGroupPtrTy ActOnOpenMPThreadprivateDirective(
                                   SourceLocation Loc,
                                   ArrayRef<Expr *> VarList);
/// \brief Builds a new OpenMPThreadPrivateDecl and checks its correctness.
OMPThreadPrivateDecl *CheckOMPThreadPrivateDecl(
                                   SourceLocation Loc,
                                   ArrayRef<Expr *> VarList);
/// \brief Check if the specified type is allowed to be used in 'omp declare
/// reduction' construct.
QualType ActOnOpenMPDeclareReductionType(SourceLocation TyLoc,
                                         TypeResult ParsedType);
/// \brief Called on start of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveStart(
    Scope *S, DeclContext *DC, DeclarationName Name,
    ArrayRef<std::pair<QualType, SourceLocation>> ReductionTypes,
    AccessSpecifier AS, Decl *PrevDeclInScope = nullptr);
/// \brief Initialize declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerStart(Scope *S, Decl *D);
/// \brief Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerEnd(Decl *D, Expr *Combiner);
/// \brief Initialize declare reduction construct initializer.
/// \return omp_priv variable.
VarDecl *ActOnOpenMPDeclareReductionInitializerStart(Scope *S, Decl *D);
/// \brief Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionInitializerEnd(Decl *D, Expr *Initializer,
                                               VarDecl *OmpPrivParm);
/// \brief Called at the end of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveEnd(
    Scope *S, DeclGroupPtrTy DeclReductions, bool IsValid);

/// Called on the start of target region i.e. '#pragma omp declare target'.
bool ActOnStartOpenMPDeclareTargetDirective(SourceLocation Loc);
/// Called at the end of target region i.e. '#pragme omp end declare target'.
void ActOnFinishOpenMPDeclareTargetDirective();
/// Called on correct id-expression from the '#pragma omp declare target'.
void ActOnOpenMPDeclareTargetName(Scope *CurScope, CXXScopeSpec &ScopeSpec,
                                  const DeclarationNameInfo &Id,
                                  OMPDeclareTargetDeclAttr::MapTypeTy MT,
                                  NamedDeclSetType &SameDirectiveDecls);
/// Check declaration inside target region.
void checkDeclIsAllowedInOpenMPTarget(Expr *E, Decl *D,
                                      SourceLocation IdLoc = SourceLocation());
/// Return true inside OpenMP declare target region.
bool isInOpenMPDeclareTargetContext() const {
  return IsInOpenMPDeclareTargetContext;
}
/// Return true inside OpenMP target region.
bool isInOpenMPTargetExecutionDirective() const;
/// Return true if (un)supported features for the current target should be
/// diagnosed if OpenMP (offloading) is enabled.
bool shouldDiagnoseTargetSupportFromOpenMP() const {
  return !getLangOpts().OpenMPIsDevice || isInOpenMPDeclareTargetContext() ||
    isInOpenMPTargetExecutionDirective();
}

/// Return the number of captured regions created for an OpenMP directive.
static int getOpenMPCaptureLevels(OpenMPDirectiveKind Kind);

/// \brief Initialization of captured region for OpenMP region.
void ActOnOpenMPRegionStart(OpenMPDirectiveKind DKind, Scope *CurScope);
/// \brief End of OpenMP region.
///
/// \param S Statement associated with the current OpenMP region.
/// \param Clauses List of clauses for the current OpenMP region.
///
/// \returns Statement for finished OpenMP region.
StmtResult ActOnOpenMPRegionEnd(StmtResult S, ArrayRef<OMPClause *> Clauses);
StmtResult ActOnOpenMPExecutableDirective(
    OpenMPDirectiveKind Kind, const DeclarationNameInfo &DirName,
    OpenMPDirectiveKind CancelRegion, ArrayRef<OMPClause *> Clauses,
    Stmt *AStmt, SourceLocation StartLoc, SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp parallel' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt,
                                        SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp for' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp for simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp sections' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp section' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSectionDirective(Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp single' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSingleDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp master' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPMasterDirective(Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp critical' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPCriticalDirective(const DeclarationNameInfo &DirName,
                                        ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp parallel for' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp parallel for simd' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp parallel sections' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                                Stmt *AStmt,
                                                SourceLocation StartLoc,
                                                SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp task' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTaskDirective(ArrayRef<OMPClause *> Clauses,
                                    Stmt *AStmt, SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskyield'.
StmtResult ActOnOpenMPTaskyieldDirective(SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp barrier'.
StmtResult ActOnOpenMPBarrierDirective(SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskwait'.
StmtResult ActOnOpenMPTaskwaitDirective(SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskgroup'.
StmtResult ActOnOpenMPTaskgroupDirective(ArrayRef<OMPClause *> Clauses,
                                         Stmt *AStmt, SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp flush'.
StmtResult ActOnOpenMPFlushDirective(ArrayRef<OMPClause *> Clauses,
                                     SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp ordered' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPOrderedDirective(ArrayRef<OMPClause *> Clauses,
                                       Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp atomic' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target data' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTargetDataDirective(ArrayRef<OMPClause *> Clauses,
                                          Stmt *AStmt, SourceLocation StartLoc,
                                          SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target enter data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetEnterDataDirective(ArrayRef<OMPClause *> Clauses,
                                               SourceLocation StartLoc,
                                               SourceLocation EndLoc,
                                               Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp target exit data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetExitDataDirective(ArrayRef<OMPClause *> Clauses,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc,
                                              Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp target parallel' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelDirective(ArrayRef<OMPClause *> Clauses,
                                              Stmt *AStmt,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target parallel for' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPTargetParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                     Stmt *AStmt, SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp cancellation point'.
StmtResult
ActOnOpenMPCancellationPointDirective(SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// \brief Called on well-formed '\#pragma omp cancel'.
StmtResult ActOnOpenMPCancelDirective(ArrayRef<OMPClause *> Clauses,
                                      SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// \brief Called on well-formed '\#pragma omp taskloop' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTaskLoopDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp taskloop simd' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTaskLoopSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target update'.
StmtResult ActOnOpenMPTargetUpdateDirective(ArrayRef<OMPClause *> Clauses,
                                            SourceLocation StartLoc,
                                            SourceLocation EndLoc,
                                            Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp distribute parallel for' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target parallel for simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target simd' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTargetSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                           Stmt *AStmt,
                                           SourceLocation StartLoc,
                                           SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target teams distribute' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for
/// simd' after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);

/// Checks correctness of linear modifiers.
bool CheckOpenMPLinearModifier(OpenMPLinearClauseKind LinKind,
                               SourceLocation LinLoc);
/// Checks that the specified declaration matches requirements for the linear
/// decls.
bool CheckOpenMPLinearDecl(ValueDecl *D, SourceLocation ELoc,
                           OpenMPLinearClauseKind LinKind, QualType Type);

/// \brief Called on well-formed '\#pragma omp declare simd' after parsing of
/// the associated method/function.
DeclGroupPtrTy ActOnOpenMPDeclareSimdDirective(
    DeclGroupPtrTy DG, OMPDeclareSimdDeclAttr::BranchStateTy BS,
    Expr *Simdlen, ArrayRef<Expr *> Uniforms, ArrayRef<Expr *> Aligneds,
    ArrayRef<Expr *> Alignments, ArrayRef<Expr *> Linears,
    ArrayRef<unsigned> LinModifiers, ArrayRef<Expr *> Steps, SourceRange SR);

OMPClause *ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind,
                                       Expr *Expr,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed 'if' clause.
OMPClause *ActOnOpenMPIfClause(OpenMPDirectiveKind NameModifier,
                               Expr *Condition, SourceLocation StartLoc,
                               SourceLocation LParenLoc,
                               SourceLocation NameModifierLoc,
                               SourceLocation ColonLoc,
                               SourceLocation EndLoc);
/// \brief Called on well-formed 'final' clause.
OMPClause *ActOnOpenMPFinalClause(Expr *Condition, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'num_threads' clause.
OMPClause *ActOnOpenMPNumThreadsClause(Expr *NumThreads,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed 'safelen' clause.
OMPClause *ActOnOpenMPSafelenClause(Expr *Length,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'simdlen' clause.
OMPClause *ActOnOpenMPSimdlenClause(Expr *Length, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'collapse' clause.
OMPClause *ActOnOpenMPCollapseClause(Expr *NumForLoops,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'ordered' clause.
OMPClause *
ActOnOpenMPOrderedClause(SourceLocation StartLoc, SourceLocation EndLoc,
                         SourceLocation LParenLoc = SourceLocation(),
                         Expr *NumForLoops = nullptr);
/// \brief Called on well-formed 'grainsize' clause.
OMPClause *ActOnOpenMPGrainsizeClause(Expr *Size, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed 'num_tasks' clause.
OMPClause *ActOnOpenMPNumTasksClause(Expr *NumTasks, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'hint' clause.
OMPClause *ActOnOpenMPHintClause(Expr *Hint, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc);

OMPClause *ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
                                   unsigned Argument,
                                   SourceLocation ArgumentLoc,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'default' clause.
OMPClause *ActOnOpenMPDefaultClause(OpenMPDefaultClauseKind Kind,
                                    SourceLocation KindLoc,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'proc_bind' clause.
OMPClause *ActOnOpenMPProcBindClause(OpenMPProcBindClauseKind Kind,
                                     SourceLocation KindLoc,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);

OMPClause *ActOnOpenMPSingleExprWithArgClause(
    OpenMPClauseKind Kind, ArrayRef<unsigned> Arguments, Expr *Expr,
    SourceLocation StartLoc, SourceLocation LParenLoc,
    ArrayRef<SourceLocation> ArgumentsLoc, SourceLocation DelimLoc,
    SourceLocation EndLoc);
/// \brief Called on well-formed 'schedule' clause.
OMPClause *ActOnOpenMPScheduleClause(
    OpenMPScheduleClauseModifier M1, OpenMPScheduleClauseModifier M2,
    OpenMPScheduleClauseKind Kind, Expr *ChunkSize, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation M1Loc, SourceLocation M2Loc,
    SourceLocation KindLoc, SourceLocation CommaLoc, SourceLocation EndLoc);

OMPClause *ActOnOpenMPClause(OpenMPClauseKind Kind, SourceLocation StartLoc,
                             SourceLocation EndLoc);
/// \brief Called on well-formed 'nowait' clause.
OMPClause *ActOnOpenMPNowaitClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'untied' clause.
OMPClause *ActOnOpenMPUntiedClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'mergeable' clause.
OMPClause *ActOnOpenMPMergeableClause(SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed 'read' clause.
OMPClause *ActOnOpenMPReadClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// \brief Called on well-formed 'write' clause.
OMPClause *ActOnOpenMPWriteClause(SourceLocation StartLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'update' clause.
OMPClause *ActOnOpenMPUpdateClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'capture' clause.
OMPClause *ActOnOpenMPCaptureClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'seq_cst' clause.
OMPClause *ActOnOpenMPSeqCstClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'threads' clause.
OMPClause *ActOnOpenMPThreadsClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'simd' clause.
OMPClause *ActOnOpenMPSIMDClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// \brief Called on well-formed 'nogroup' clause.
OMPClause *ActOnOpenMPNogroupClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);

OMPClause *ActOnOpenMPVarListClause(
    OpenMPClauseKind Kind, ArrayRef<Expr *> Vars, Expr *TailExpr,
    SourceLocation StartLoc, SourceLocation LParenLoc,
    SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId, OpenMPDependClauseKind DepKind,
    OpenMPLinearClauseKind LinKind, OpenMPMapClauseKind MapTypeModifier,
    OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
    SourceLocation DepLinMapLoc);
/// \brief Called on well-formed 'private' clause.
OMPClause *ActOnOpenMPPrivateClause(ArrayRef<Expr *> VarList,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'firstprivate' clause.
OMPClause *ActOnOpenMPFirstprivateClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed 'lastprivate' clause.
OMPClause *ActOnOpenMPLastprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'shared' clause.
OMPClause *ActOnOpenMPSharedClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'reduction' clause.
OMPClause *ActOnOpenMPReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'task_reduction' clause.
OMPClause *ActOnOpenMPTaskReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'in_reduction' clause.
OMPClause *ActOnOpenMPInReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// \brief Called on well-formed 'linear' clause.
OMPClause *
ActOnOpenMPLinearClause(ArrayRef<Expr *> VarList, Expr *Step,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        OpenMPLinearClauseKind LinKind, SourceLocation LinLoc,
                        SourceLocation ColonLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'aligned' clause.
OMPClause *ActOnOpenMPAlignedClause(ArrayRef<Expr *> VarList,
                                    Expr *Alignment,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation ColonLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'copyin' clause.
OMPClause *ActOnOpenMPCopyinClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'copyprivate' clause.
OMPClause *ActOnOpenMPCopyprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'flush' pseudo clause.
OMPClause *ActOnOpenMPFlushClause(ArrayRef<Expr *> VarList,
                                  SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'depend' clause.
OMPClause *
ActOnOpenMPDependClause(OpenMPDependClauseKind DepKind, SourceLocation DepLoc,
                        SourceLocation ColonLoc, ArrayRef<Expr *> VarList,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        SourceLocation EndLoc);
/// \brief Called on well-formed 'device' clause.
OMPClause *ActOnOpenMPDeviceClause(Expr *Device, SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'map' clause.
OMPClause *
ActOnOpenMPMapClause(OpenMPMapClauseKind MapTypeModifier,
                     OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
                     SourceLocation MapLoc, SourceLocation ColonLoc,
                     ArrayRef<Expr *> VarList, SourceLocation StartLoc,
                     SourceLocation LParenLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'num_teams' clause.
OMPClause *ActOnOpenMPNumTeamsClause(Expr *NumTeams, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'thread_limit' clause.
OMPClause *ActOnOpenMPThreadLimitClause(Expr *ThreadLimit,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'priority' clause.
OMPClause *ActOnOpenMPPriorityClause(Expr *Priority, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'dist_schedule' clause.
OMPClause *ActOnOpenMPDistScheduleClause(
    OpenMPDistScheduleClauseKind Kind, Expr *ChunkSize,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation KindLoc,
    SourceLocation CommaLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'defaultmap' clause.
OMPClause *ActOnOpenMPDefaultmapClause(
    OpenMPDefaultmapClauseModifier M, OpenMPDefaultmapClauseKind Kind,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation MLoc,
    SourceLocation KindLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'to' clause.
OMPClause *ActOnOpenMPToClause(ArrayRef<Expr *> VarList,
                               SourceLocation StartLoc,
                               SourceLocation LParenLoc,
                               SourceLocation EndLoc);
/// \brief Called on well-formed 'from' clause.
OMPClause *ActOnOpenMPFromClause(ArrayRef<Expr *> VarList,
                                 SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc);
/// Called on well-formed 'use_device_ptr' clause.
OMPClause *ActOnOpenMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc);
/// Called on well-formed 'is_device_ptr' clause.
OMPClause *ActOnOpenMPIsDevicePtrClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);

/// \brief The kind of conversion being performed.
enum CheckedConversionKind {
  /// \brief An implicit conversion.
  CCK_ImplicitConversion,
  /// \brief A C-style cast.
  CCK_CStyleCast,
  /// \brief A functional-style cast.
  CCK_FunctionalCast,
  /// \brief A cast other than a C-style cast.
  CCK_OtherCast
};

/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit
/// cast.  If there is already an implicit cast, merge into the existing one.
/// If isLvalue, the result of the cast is an lvalue.
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK,
                             ExprValueKind VK = VK_RValue,
                             const CXXCastPath *BasePath = nullptr,
                             CheckedConversionKind CCK
                                = CCK_ImplicitConversion);

/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
/// to the conversion from scalar type ScalarTy to the Boolean type.
static CastKind ScalarTypeToBooleanCastKind(QualType ScalarTy);

/// IgnoredValueConversions - Given that an expression's result is
/// syntactically ignored, perform any conversions that are
/// required.
ExprResult IgnoredValueConversions(Expr *E);

// UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts
// functions and arrays to their respective pointers (C99 6.3.2.1).
ExprResult UsualUnaryConversions(Expr *E);

/// CallExprUnaryConversions - a special case of an unary conversion
/// performed on a function designator of a call expression.
ExprResult CallExprUnaryConversions(Expr *E);

// DefaultFunctionArrayConversion - converts functions and arrays
// to their respective pointers (C99 6.3.2.1).
ExprResult DefaultFunctionArrayConversion(Expr *E, bool Diagnose = true);

// DefaultFunctionArrayLvalueConversion - converts functions and
// arrays to their respective pointers and performs the
// lvalue-to-rvalue conversion.
ExprResult DefaultFunctionArrayLvalueConversion(Expr *E,
                                                bool Diagnose = true);

// DefaultLvalueConversion - performs lvalue-to-rvalue conversion on
// the operand.  This is DefaultFunctionArrayLvalueConversion,
// except that it assumes the operand isn't of function or array
// type.
ExprResult DefaultLvalueConversion(Expr *E);

// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
// do not have a prototype. Integer promotions are performed on each
// argument, and arguments that have type float are promoted to double.
ExprResult DefaultArgumentPromotion(Expr *E);

/// If \p E is a prvalue denoting an unmaterialized temporary, materialize
/// it as an xvalue. In C++98, the result will still be a prvalue, because
/// we don't have xvalues there.
ExprResult TemporaryMaterializationConversion(Expr *E);

// Used for emitting the right warning by DefaultVariadicArgumentPromotion
enum VariadicCallType {
  VariadicFunction,
  VariadicBlock,
  VariadicMethod,
  VariadicConstructor,
  VariadicDoesNotApply
};

VariadicCallType getVariadicCallType(FunctionDecl *FDecl,
                                     const FunctionProtoType *Proto,
                                     Expr *Fn);

// Used for determining in which context a type is allowed to be passed to a
// vararg function.
enum VarArgKind {
  VAK_Valid,
  VAK_ValidInCXX11,
  VAK_Undefined,
  VAK_MSVCUndefined,
  VAK_Invalid
};

// Determines which VarArgKind fits an expression.
VarArgKind isValidVarArgType(const QualType &Ty);

/// Check to see if the given expression is a valid argument to a variadic
/// function, issuing a diagnostic if not.
void checkVariadicArgument(const Expr *E, VariadicCallType CT);

/// Check to see if a given expression could have '.c_str()' called on it.
bool hasCStrMethod(const Expr *E);

/// GatherArgumentsForCall - Collector argument expressions for various
/// form of call prototypes.
bool GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
                            const FunctionProtoType *Proto,
                            unsigned FirstParam, ArrayRef<Expr *> Args,
                            SmallVectorImpl<Expr *> &AllArgs,
                            VariadicCallType CallType = VariadicDoesNotApply,
                            bool AllowExplicit = false,
                            bool IsListInitialization = false);

// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
// will create a runtime trap if the resulting type is not a POD type.
ExprResult DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
                                            FunctionDecl *FDecl);

// UsualArithmeticConversions - performs the UsualUnaryConversions on it's
// operands and then handles various conversions that are common to binary
// operators (C99 6.3.1.8). If both operands aren't arithmetic, this
// routine returns the first non-arithmetic type found. The client is
// responsible for emitting appropriate error diagnostics.
QualType UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
                                    bool IsCompAssign = false);

/// AssignConvertType - All of the 'assignment' semantic checks return this
/// enum to indicate whether the assignment was allowed.  These checks are
/// done for simple assignments, as well as initialization, return from
/// function, argument passing, etc.  The query is phrased in terms of a
/// source and destination type.
enum AssignConvertType {
  /// Compatible - the types are compatible according to the standard.
  Compatible,

  /// PointerToInt - The assignment converts a pointer to an int, which we
  /// accept as an extension.
  PointerToInt,

  /// IntToPointer - The assignment converts an int to a pointer, which we
  /// accept as an extension.
  IntToPointer,

  /// FunctionVoidPointer - The assignment is between a function pointer and
  /// void*, which the standard doesn't allow, but we accept as an extension.
  FunctionVoidPointer,

  /// IncompatiblePointer - The assignment is between two pointers types that
  /// are not compatible, but we accept them as an extension.
  IncompatiblePointer,

  /// IncompatiblePointerSign - The assignment is between two pointers types
  /// which point to integers which have a different sign, but are otherwise
  /// identical. This is a subset of the above, but broken out because it's by
  /// far the most common case of incompatible pointers.
  IncompatiblePointerSign,

  /// CompatiblePointerDiscardsQualifiers - The assignment discards
  /// c/v/r qualifiers, which we accept as an extension.
  CompatiblePointerDiscardsQualifiers,

  /// IncompatiblePointerDiscardsQualifiers - The assignment
  /// discards qualifiers that we don't permit to be discarded,
  /// like address spaces.
  IncompatiblePointerDiscardsQualifiers,

  /// IncompatibleNestedPointerQualifiers - The assignment is between two
  /// nested pointer types, and the qualifiers other than the first two
  /// levels differ e.g. char ** -> const char **, but we accept them as an
  /// extension.
  IncompatibleNestedPointerQualifiers,

  /// IncompatibleVectors - The assignment is between two vector types that
  /// have the same size, which we accept as an extension.
  IncompatibleVectors,

  /// IntToBlockPointer - The assignment converts an int to a block
  /// pointer. We disallow this.
  IntToBlockPointer,

  /// IncompatibleBlockPointer - The assignment is between two block
  /// pointers types that are not compatible.
  IncompatibleBlockPointer,

  /// IncompatibleObjCQualifiedId - The assignment is between a qualified
  /// id type and something else (that is incompatible with it). For example,
  /// "id <XXX>" = "Foo *", where "Foo *" doesn't implement the XXX protocol.
  IncompatibleObjCQualifiedId,

  /// IncompatibleObjCWeakRef - Assigning a weak-unavailable object to an
  /// object with __weak qualifier.
  IncompatibleObjCWeakRef,

  /// Incompatible - We reject this conversion outright, it is invalid to
  /// represent it in the AST.
  Incompatible
};

/// DiagnoseAssignmentResult - Emit a diagnostic, if required, for the
/// assignment conversion type specified by ConvTy.  This returns true if the
/// conversion was invalid or false if the conversion was accepted.
bool DiagnoseAssignmentResult(AssignConvertType ConvTy,
                              SourceLocation Loc,
                              QualType DstType, QualType SrcType,
                              Expr *SrcExpr, AssignmentAction Action,
                              bool *Complained = nullptr);

/// IsValueInFlagEnum - Determine if a value is allowed as part of a flag
/// enum. If AllowMask is true, then we also allow the complement of a valid
/// value, to be used as a mask.
bool IsValueInFlagEnum(const EnumDecl *ED, const llvm::APInt &Val,
                       bool AllowMask) const;

/// DiagnoseAssignmentEnum - Warn if assignment to enum is a constant
/// integer not in the range of enum values.
void DiagnoseAssignmentEnum(QualType DstType, QualType SrcType,
                            Expr *SrcExpr);

/// CheckAssignmentConstraints - Perform type checking for assignment,
/// argument passing, variable initialization, and function return values.
/// C99 6.5.16.
AssignConvertType CheckAssignmentConstraints(SourceLocation Loc,
                                             QualType LHSType,
                                             QualType RHSType);

/// Check assignment constraints and optionally prepare for a conversion of
/// the RHS to the LHS type. The conversion is prepared for if ConvertRHS
/// is true.
AssignConvertType CheckAssignmentConstraints(QualType LHSType,
                                             ExprResult &RHS,
                                             CastKind &Kind,
                                             bool ConvertRHS = true);

/// Check assignment constraints for an assignment of RHS to LHSType.
///
/// \param LHSType The destination type for the assignment.
/// \param RHS The source expression for the assignment.
/// \param Diagnose If \c true, diagnostics may be produced when checking
///        for assignability. If a diagnostic is produced, \p RHS will be
///        set to ExprError(). Note that this function may still return
///        without producing a diagnostic, even for an invalid assignment.
/// \param DiagnoseCFAudited If \c true, the target is a function parameter
///        in an audited Core Foundation API and does not need to be checked
///        for ARC retain issues.
/// \param ConvertRHS If \c true, \p RHS will be updated to model the
///        conversions necessary to perform the assignment. If \c false,
///        \p Diagnose must also be \c false.
AssignConvertType CheckSingleAssignmentConstraints(
    QualType LHSType, ExprResult &RHS, bool Diagnose = true,
    bool DiagnoseCFAudited = false, bool ConvertRHS = true);

// \brief If the lhs type is a transparent union, check whether we
// can initialize the transparent union with the given expression.
AssignConvertType CheckTransparentUnionArgumentConstraints(QualType ArgType,
                                                           ExprResult &RHS);

bool IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType);

bool CheckExceptionSpecCompatibility(Expr *From, QualType ToType);

ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit = false);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit,
                                     ImplicitConversionSequence& ICS);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const ImplicitConversionSequence& ICS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK
                                        = CCK_ImplicitConversion);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const StandardConversionSequence& SCS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK);

/// the following "Check" methods will return a valid/converted QualType
/// or a null QualType (indicating an error diagnostic was issued).

/// type checking binary operators (subroutines of CreateBuiltinBinOp).
QualType InvalidOperands(SourceLocation Loc, ExprResult &LHS,
                         ExprResult &RHS);
QualType InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
                               ExprResult &RHS);
QualType CheckPointerToMemberOperands( // C++ 5.5
  ExprResult &LHS, ExprResult &RHS, ExprValueKind &VK,
  SourceLocation OpLoc, bool isIndirect);
QualType CheckMultiplyDivideOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign,
  bool IsDivide);
QualType CheckRemainderOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  bool IsCompAssign = false);
QualType CheckAdditionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, QualType* CompLHSTy = nullptr);
QualType CheckSubtractionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  QualType* CompLHSTy = nullptr);
QualType CheckShiftOperands( // C99 6.5.7
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, bool IsCompAssign = false);
QualType CheckCompareOperands( // C99 6.5.8/9
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, bool isRelational);
QualType CheckBitwiseOperands( // C99 6.5.[10...12]
    ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
    BinaryOperatorKind Opc);
QualType CheckLogicalOperands( // C99 6.5.[13,14]
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc);
// CheckAssignmentOperands is used for both simple and compound assignment.
// For simple assignment, pass both expressions and a null converted type.
// For compound assignment, pass both expressions and the converted type.
QualType CheckAssignmentOperands( // C99 6.5.16.[1,2]
  Expr *LHSExpr, ExprResult &RHS, SourceLocation Loc, QualType CompoundType);

ExprResult checkPseudoObjectIncDec(Scope *S, SourceLocation OpLoc,
                                   UnaryOperatorKind Opcode, Expr *Op);
ExprResult checkPseudoObjectAssignment(Scope *S, SourceLocation OpLoc,
                                       BinaryOperatorKind Opcode,
                                       Expr *LHS, Expr *RHS);
ExprResult checkPseudoObjectRValue(Expr *E);
Expr *recreateSyntacticForm(PseudoObjectExpr *E);

QualType CheckConditionalOperands( // C99 6.5.15
  ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation QuestionLoc);
QualType CXXCheckConditionalOperands( // C++ 5.16
  ExprResult &cond, ExprResult &lhs, ExprResult &rhs,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation questionLoc);
QualType FindCompositePointerType(SourceLocation Loc, Expr *&E1, Expr *&E2,
                                  bool ConvertArgs = true);
QualType FindCompositePointerType(SourceLocation Loc,
                                  ExprResult &E1, ExprResult &E2,
                                  bool ConvertArgs = true) {
  Expr *E1Tmp = E1.get(), *E2Tmp = E2.get();
  QualType Composite =
      FindCompositePointerType(Loc, E1Tmp, E2Tmp, ConvertArgs);
  E1 = E1Tmp;
  E2 = E2Tmp;
  return Composite;
}

QualType FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
                                      SourceLocation QuestionLoc);

bool DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
                                SourceLocation QuestionLoc);

void DiagnoseAlwaysNonNullPointer(Expr *E,
                                  Expr::NullPointerConstantKind NullType,
                                  bool IsEqual, SourceRange Range);

/// type checking for vector binary operators.
QualType CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
                             SourceLocation Loc, bool IsCompAssign,
                             bool AllowBothBool, bool AllowBoolConversion);
QualType GetSignedVectorType(QualType V);
QualType CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc,
                                    BinaryOperatorKind Opc);
QualType CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc);

bool areLaxCompatibleVectorTypes(QualType srcType, QualType destType);
bool isLaxVectorConversion(QualType srcType, QualType destType);

/// type checking declaration initializers (C99 6.7.8)
bool CheckForConstantInitializer(Expr *e, QualType t);

// type checking C++ declaration initializers (C++ [dcl.init]).

/// ReferenceCompareResult - Expresses the result of comparing two
/// types (cv1 T1 and cv2 T2) to determine their compatibility for the
/// purposes of initialization by reference (C++ [dcl.init.ref]p4).
enum ReferenceCompareResult {
  /// Ref_Incompatible - The two types are incompatible, so direct
  /// reference binding is not possible.
  Ref_Incompatible = 0,
  /// Ref_Related - The two types are reference-related, which means
  /// that their unqualified forms (T1 and T2) are either the same
  /// or T1 is a base class of T2.
  Ref_Related,
  /// Ref_Compatible - The two types are reference-compatible.
  Ref_Compatible
};

ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc,
                                                    QualType T1, QualType T2,
                                                    bool &DerivedToBase,
                                                    bool &ObjCConversion,
                                              bool &ObjCLifetimeConversion);

ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
                               Expr *CastExpr, CastKind &CastKind,
                               ExprValueKind &VK, CXXCastPath &Path);

/// \brief Force an expression with unknown-type to an expression of the
/// given type.
ExprResult forceUnknownAnyToType(Expr *E, QualType ToType);

/// \brief Type-check an expression that's being passed to an
/// __unknown_anytype parameter.
ExprResult checkUnknownAnyArg(SourceLocation callLoc,
                              Expr *result, QualType &paramType);

// CheckVectorCast - check type constraints for vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size.
// returns true if the cast is invalid
bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
                     CastKind &Kind);

/// \brief Prepare `SplattedExpr` for a vector splat operation, adding
/// implicit casts if necessary.
ExprResult prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr);

// CheckExtVectorCast - check type constraints for extended vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size,
// or vectors and the element type of that vector.
// returns the cast expr
ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr,
                              CastKind &Kind);

ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type,
                                      SourceLocation LParenLoc,
                                      Expr *CastExpr,
                                      SourceLocation RParenLoc);

enum ARCConversionResult { ACR_okay, ACR_unbridged, ACR_error };

/// \brief Checks for invalid conversions and casts between
/// retainable pointers and other pointer kinds for ARC and Weak.
ARCConversionResult CheckObjCConversion(SourceRange castRange,
                                        QualType castType, Expr *&op,
                                        CheckedConversionKind CCK,
                                        bool Diagnose = true,
                                        bool DiagnoseCFAudited = false,
                                        BinaryOperatorKind Opc = BO_PtrMemD
                                        );

Expr *stripARCUnbridgedCast(Expr *e);
void diagnoseARCUnbridgedCast(Expr *e);

bool CheckObjCARCUnavailableWeakConversion(QualType castType,
                                           QualType ExprType);

/// checkRetainCycles - Check whether an Objective-C message send
/// might create an obvious retain cycle.
void checkRetainCycles(ObjCMessageExpr *msg);
void checkRetainCycles(Expr *receiver, Expr *argument);
void checkRetainCycles(VarDecl *Var, Expr *Init);

/// checkUnsafeAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained type.
bool checkUnsafeAssigns(SourceLocation Loc, QualType LHS, Expr *RHS);

/// checkUnsafeExprAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained expression.
void checkUnsafeExprAssigns(SourceLocation Loc, Expr *LHS, Expr *RHS);

/// CheckMessageArgumentTypes - Check types in an Obj-C message send.
/// \param Method - May be null.
/// \param [out] ReturnType - The return type of the send.
/// \return true iff there were any incompatible types.
bool CheckMessageArgumentTypes(QualType ReceiverType,
                               MultiExprArg Args, Selector Sel,
                               ArrayRef<SourceLocation> SelectorLocs,
                               ObjCMethodDecl *Method, bool isClassMessage,
                               bool isSuperMessage,
                               SourceLocation lbrac, SourceLocation rbrac,
                               SourceRange RecRange,
                               QualType &ReturnType, ExprValueKind &VK);

/// \brief Determine the result of a message send expression based on
/// the type of the receiver, the method expected to receive the message,
/// and the form of the message send.
QualType getMessageSendResultType(QualType ReceiverType,
                                  ObjCMethodDecl *Method,
                                  bool isClassMessage, bool isSuperMessage);

/// \brief If the given expression involves a message send to a method
/// with a related result type, emit a note describing what happened.
void EmitRelatedResultTypeNote(const Expr *E);

/// \brief Given that we had incompatible pointer types in a return
/// statement, check whether we're in a method with a related result
/// type, and if so, emit a note describing what happened.
void EmitRelatedResultTypeNoteForReturn(QualType destType);

class ConditionResult {
  Decl *ConditionVar;
  FullExprArg Condition;
  bool Invalid;
  bool HasKnownValue;
  bool KnownValue;

  friend class Sema;
  ConditionResult(Sema &S, Decl *ConditionVar, FullExprArg Condition,
                  bool IsConstexpr)
      : ConditionVar(ConditionVar), Condition(Condition), Invalid(false),
        HasKnownValue(IsConstexpr && Condition.get() &&
                      !Condition.get()->isValueDependent()),
        KnownValue(HasKnownValue &&
                   !!Condition.get()->EvaluateKnownConstInt(S.Context)) {}
  explicit ConditionResult(bool Invalid)
      : ConditionVar(nullptr), Condition(nullptr), Invalid(Invalid),
        HasKnownValue(false), KnownValue(false) {}

public:
  ConditionResult() : ConditionResult(false) {}
  bool isInvalid() const { return Invalid; }
  std::pair<VarDecl *, Expr *> get() const {
    return std::make_pair(cast_or_null<VarDecl>(ConditionVar),
                          Condition.get());
  }
  llvm::Optional<bool> getKnownValue() const {
    if (!HasKnownValue)
      return None;
    return KnownValue;
  }
};
static ConditionResult ConditionError() { return ConditionResult(true); }

enum class ConditionKind {
  Boolean,     ///< A boolean condition, from 'if', 'while', 'for', or 'do'.
  ConstexprIf, ///< A constant boolean condition from 'if constexpr'.
  Switch       ///< An integral condition for a 'switch' statement.
};

ConditionResult ActOnCondition(Scope *S, SourceLocation Loc,
                               Expr *SubExpr, ConditionKind CK);

ConditionResult ActOnConditionVariable(Decl *ConditionVar,
                                       SourceLocation StmtLoc,
                                       ConditionKind CK);

DeclResult ActOnCXXConditionDeclaration(Scope *S, Declarator &D);

ExprResult CheckConditionVariable(VarDecl *ConditionVar,
                                  SourceLocation StmtLoc,
                                  ConditionKind CK);
ExprResult CheckSwitchCondition(SourceLocation SwitchLoc, Expr *Cond);

/// CheckBooleanCondition - Diagnose problems involving the use of
/// the given expression as a boolean condition (e.g. in an if
/// statement).  Also performs the standard function and array
/// decays, possibly changing the input variable.
///
/// \param Loc - A location associated with the condition, e.g. the
/// 'if' keyword.
/// \return true iff there were any errors
ExprResult CheckBooleanCondition(SourceLocation Loc, Expr *E,
                                 bool IsConstexpr = false);

/// DiagnoseAssignmentAsCondition - Given that an expression is
/// being used as a boolean condition, warn if it's an assignment.
void DiagnoseAssignmentAsCondition(Expr *E);

/// \brief Redundant parentheses over an equality comparison can indicate
/// that the user intended an assignment used as condition.
void DiagnoseEqualityWithExtraParens(ParenExpr *ParenE);

/// CheckCXXBooleanCondition - Returns true if conversion to bool is invalid.
ExprResult CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr = false);

/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have
/// the specified width and sign.  If an overflow occurs, detect it and emit
/// the specified diagnostic.
void ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &OldVal,
                                        unsigned NewWidth, bool NewSign,
                                        SourceLocation Loc, unsigned DiagID);

/// Checks that the Objective-C declaration is declared in the global scope.
/// Emits an error and marks the declaration as invalid if it's not declared
/// in the global scope.
bool CheckObjCDeclScope(Decl *D);

/// \brief Abstract base class used for diagnosing integer constant
/// expression violations.
class VerifyICEDiagnoser {
public:
  bool Suppress;

  VerifyICEDiagnoser(bool Suppress = false) : Suppress(Suppress) { }

  virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) =0;
  virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR);
  virtual ~VerifyICEDiagnoser() { }
};

/// VerifyIntegerConstantExpression - Verifies that an expression is an ICE,
/// and reports the appropriate diagnostics. Returns false on success.
/// Can optionally return the value of the expression.
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           VerifyICEDiagnoser &Diagnoser,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           unsigned DiagID,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E,
                                           llvm::APSInt *Result = nullptr);

/// VerifyBitField - verifies that a bit field expression is an ICE and has
/// the correct width, and that the field type is valid.
/// Returns false on success.
/// Can optionally return whether the bit-field is of width 0
ExprResult VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
                          QualType FieldTy, bool IsMsStruct,
                          Expr *BitWidth, bool *ZeroWidth = nullptr);

9871private:
unsigned ForceCUDAHostDeviceDepth = 0;

9874public:
/// Increments our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  So long as this count is greater
/// than zero, all functions encountered will be __host__ __device__.
void PushForceCUDAHostDevice();

/// Decrements our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  Returns false if the count is 0
/// before incrementing, so you can emit an error.
bool PopForceCUDAHostDevice();

/// Diagnostics that are emitted only if we discover that the given function
/// must be codegen'ed.  Because handling these correctly adds overhead to
/// compilation, this is currently only enabled for CUDA compilations.
llvm::DenseMap<CanonicalDeclPtr<FunctionDecl>,
               std::vector<PartialDiagnosticAt>>
    CUDADeferredDiags;

/// A pair of a canonical FunctionDecl and a SourceLocation.  When used as the
/// key in a hashtable, both the FD and location are hashed.
struct FunctionDeclAndLoc {
  CanonicalDeclPtr<FunctionDecl> FD;
  SourceLocation Loc;
};

/// FunctionDecls and SourceLocations for which CheckCUDACall has emitted a
/// (maybe deferred) "bad call" diagnostic.  We use this to avoid emitting the
/// same deferred diag twice.
llvm::DenseSet<FunctionDeclAndLoc> LocsWithCUDACallDiags;

/// An inverse call graph, mapping known-emitted functions to one of their
/// known-emitted callers (plus the location of the call).
///
/// Functions that we can tell a priori must be emitted aren't added to this
/// map.
llvm::DenseMap</* Callee = */ CanonicalDeclPtr<FunctionDecl>,
               /* Caller = */ FunctionDeclAndLoc>
    CUDAKnownEmittedFns;

/// A partial call graph maintained during CUDA compilation to support
/// deferred diagnostics.
///
/// Functions are only added here if, at the time they're considered, they are
/// not known-emitted.  As soon as we discover that a function is
/// known-emitted, we remove it and everything it transitively calls from this
/// set and add those functions to CUDAKnownEmittedFns.
llvm::DenseMap</* Caller = */ CanonicalDeclPtr<FunctionDecl>,
               /* Callees = */ llvm::MapVector<CanonicalDeclPtr<FunctionDecl>,
                                               SourceLocation>>
    CUDACallGraph;

/// Diagnostic builder for CUDA errors which may or may not be deferred.
///
/// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
/// which are not allowed to appear inside __device__ functions and are
/// allowed to appear in __host__ __device__ functions only if the host+device
/// function is never codegen'ed.
///
/// To handle this, we use the notion of "deferred diagnostics", where we
/// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
///
/// This class lets you emit either a regular diagnostic, a deferred
/// diagnostic, or no diagnostic at all, according to an argument you pass to
/// its constructor, thus simplifying the process of creating these "maybe
/// deferred" diagnostics.
class CUDADiagBuilder {
public:
  enum Kind {
    /// Emit no diagnostics.
    K_Nop,
    /// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
    K_Immediate,
    /// Emit the diagnostic immediately, and, if it's a warning or error, also
    /// emit a call stack showing how this function can be reached by an a
    /// priori known-emitted function.
    K_ImmediateWithCallStack,
    /// Create a deferred diagnostic, which is emitted only if the function
    /// it's attached to is codegen'ed.  Also emit a call stack as with
    /// K_ImmediateWithCallStack.
    K_Deferred
  };

  CUDADiagBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
                  FunctionDecl *Fn, Sema &S);
  ~CUDADiagBuilder();

  /// Convertible to bool: True if we immediately emitted an error, false if
  /// we didn't emit an error or we created a deferred error.
  ///
  /// Example usage:
  ///
  ///   if (CUDADiagBuilder(...) << foo << bar)
  ///     return ExprError();
  ///
  /// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
  /// want to use these instead of creating a CUDADiagBuilder yourself.
  operator bool() const { return ImmediateDiag.hasValue(); }

  template <typename T>
  friend const CUDADiagBuilder &operator<<(const CUDADiagBuilder &Diag,
                                           const T &Value) {
    if (Diag.ImmediateDiag.hasValue())
5
←
Assuming the condition is false→
6
←
Taking false branch→
      *Diag.ImmediateDiag << Value;
    else if (Diag.PartialDiag.hasValue())
7
←
Assuming the condition is true→
8
←
Taking true branch→
      *Diag.PartialDiag << Value;
9
←
Calling 'operator<<'→
20
←
Returned allocated memory→
    return Diag;
  }

private:
  Sema &S;
  SourceLocation Loc;
  unsigned DiagID;
  FunctionDecl *Fn;
  bool ShowCallStack;

  // Invariant: At most one of these Optionals has a value.
  // FIXME: Switch these to a Variant once that exists.
  llvm::Optional<SemaDiagnosticBuilder> ImmediateDiag;
  llvm::Optional<PartialDiagnostic> PartialDiag;
};

/// Creates a CUDADiagBuilder that emits the diagnostic if the current context
/// is "used as device code".
///
/// - If CurContext is a __host__ function, does not emit any diagnostics.
/// - If CurContext is a __device__ or __global__ function, emits the
///   diagnostics immediately.
/// - If CurContext is a __host__ __device__ function and we are compiling for
///   the device, creates a diagnostic which is emitted if and when we realize
///   that the function will be codegen'ed.
///
/// Example usage:
///
///  // Variable-length arrays are not allowed in CUDA device code.
///  if (CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget())
///    return ExprError();
///  // Otherwise, continue parsing as normal.
CUDADiagBuilder CUDADiagIfDeviceCode(SourceLocation Loc, unsigned DiagID);

/// Creates a CUDADiagBuilder that emits the diagnostic if the current context
/// is "used as host code".
///
/// Same as CUDADiagIfDeviceCode, with "host" and "device" switched.
CUDADiagBuilder CUDADiagIfHostCode(SourceLocation Loc, unsigned DiagID);

enum CUDAFunctionTarget {
  CFT_Device,
  CFT_Global,
  CFT_Host,
  CFT_HostDevice,
  CFT_InvalidTarget
};

/// Determines whether the given function is a CUDA device/host/kernel/etc.
/// function.
///
/// Use this rather than examining the function's attributes yourself -- you
/// will get it wrong.  Returns CFT_Host if D is null.
CUDAFunctionTarget IdentifyCUDATarget(const FunctionDecl *D,
                                      bool IgnoreImplicitHDAttr = false);
CUDAFunctionTarget IdentifyCUDATarget(const AttributeList *Attr);

/// Gets the CUDA target for the current context.
CUDAFunctionTarget CurrentCUDATarget() {
  return IdentifyCUDATarget(dyn_cast<FunctionDecl>(CurContext));
}

// CUDA function call preference. Must be ordered numerically from
// worst to best.
enum CUDAFunctionPreference {
  CFP_Never,      // Invalid caller/callee combination.
  CFP_WrongSide,  // Calls from host-device to host or device
                  // function that do not match current compilation
                  // mode.
  CFP_HostDevice, // Any calls to host/device functions.
  CFP_SameSide,   // Calls from host-device to host or device
                  // function matching current compilation mode.
  CFP_Native,     // host-to-host or device-to-device calls.
};

/// Identifies relative preference of a given Caller/Callee
/// combination, based on their host/device attributes.
/// \param Caller function which needs address of \p Callee.
///               nullptr in case of global context.
/// \param Callee target function
///
/// \returns preference value for particular Caller/Callee combination.
CUDAFunctionPreference IdentifyCUDAPreference(const FunctionDecl *Caller,
                                              const FunctionDecl *Callee);

/// Determines whether Caller may invoke Callee, based on their CUDA
/// host/device attributes.  Returns false if the call is not allowed.
///
/// Note: Will return true for CFP_WrongSide calls.  These may appear in
/// semantically correct CUDA programs, but only if they're never codegen'ed.
bool IsAllowedCUDACall(const FunctionDecl *Caller,
                       const FunctionDecl *Callee) {
  return IdentifyCUDAPreference(Caller, Callee) != CFP_Never;
}

/// May add implicit CUDAHostAttr and CUDADeviceAttr attributes to FD,
/// depending on FD and the current compilation settings.
void maybeAddCUDAHostDeviceAttrs(FunctionDecl *FD,
                                 const LookupResult &Previous);

10079public:
/// Check whether we're allowed to call Callee from the current context.
///
/// - If the call is never allowed in a semantically-correct program
///   (CFP_Never), emits an error and returns false.
///
/// - If the call is allowed in semantically-correct programs, but only if
///   it's never codegen'ed (CFP_WrongSide), creates a deferred diagnostic to
///   be emitted if and when the caller is codegen'ed, and returns true.
///
///   Will only create deferred diagnostics for a given SourceLocation once,
///   so you can safely call this multiple times without generating duplicate
///   deferred errors.
///
/// - Otherwise, returns true without emitting any diagnostics.
bool CheckCUDACall(SourceLocation Loc, FunctionDecl *Callee);

/// Set __device__ or __host__ __device__ attributes on the given lambda
/// operator() method.
///
/// CUDA lambdas declared inside __device__ or __global__ functions inherit
/// the __device__ attribute.  Similarly, lambdas inside __host__ __device__
/// functions become __host__ __device__ themselves.
void CUDASetLambdaAttrs(CXXMethodDecl *Method);

/// Finds a function in \p Matches with highest calling priority
/// from \p Caller context and erases all functions with lower
/// calling priority.
void EraseUnwantedCUDAMatches(
    const FunctionDecl *Caller,
    SmallVectorImpl<std::pair<DeclAccessPair, FunctionDecl *>> &Matches);

/// Given a implicit special member, infer its CUDA target from the
/// calls it needs to make to underlying base/field special members.
/// \param ClassDecl the class for which the member is being created.
/// \param CSM the kind of special member.
/// \param MemberDecl the special member itself.
/// \param ConstRHS true if this is a copy operation with a const object on
///        its RHS.
/// \param Diagnose true if this call should emit diagnostics.
/// \return true if there was an error inferring.
/// The result of this call is implicit CUDA target attribute(s) attached to
/// the member declaration.
bool inferCUDATargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl,
                                             CXXSpecialMember CSM,
                                             CXXMethodDecl *MemberDecl,
                                             bool ConstRHS,
                                             bool Diagnose);

/// \return true if \p CD can be considered empty according to CUDA
/// (E.2.3.1 in CUDA 7.5 Programming guide).
bool isEmptyCudaConstructor(SourceLocation Loc, CXXConstructorDecl *CD);
bool isEmptyCudaDestructor(SourceLocation Loc, CXXDestructorDecl *CD);

/// Check whether NewFD is a valid overload for CUDA. Emits
/// diagnostics and invalidates NewFD if not.
void checkCUDATargetOverload(FunctionDecl *NewFD,
                             const LookupResult &Previous);
/// Copies target attributes from the template TD to the function FD.
void inheritCUDATargetAttrs(FunctionDecl *FD, const FunctionTemplateDecl &TD);

/// \name Code completion
//@{
/// \brief Describes the context in which code completion occurs.
enum ParserCompletionContext {
  /// \brief Code completion occurs at top-level or namespace context.
  PCC_Namespace,
  /// \brief Code completion occurs within a class, struct, or union.
  PCC_Class,
  /// \brief Code completion occurs within an Objective-C interface, protocol,
  /// or category.
  PCC_ObjCInterface,
  /// \brief Code completion occurs within an Objective-C implementation or
  /// category implementation
  PCC_ObjCImplementation,
  /// \brief Code completion occurs within the list of instance variables
  /// in an Objective-C interface, protocol, category, or implementation.
  PCC_ObjCInstanceVariableList,
  /// \brief Code completion occurs following one or more template
  /// headers.
  PCC_Template,
  /// \brief Code completion occurs following one or more template
  /// headers within a class.
  PCC_MemberTemplate,
  /// \brief Code completion occurs within an expression.
  PCC_Expression,
  /// \brief Code completion occurs within a statement, which may
  /// also be an expression or a declaration.
  PCC_Statement,
  /// \brief Code completion occurs at the beginning of the
  /// initialization statement (or expression) in a for loop.
  PCC_ForInit,
  /// \brief Code completion occurs within the condition of an if,
  /// while, switch, or for statement.
  PCC_Condition,
  /// \brief Code completion occurs within the body of a function on a
  /// recovery path, where we do not have a specific handle on our position
  /// in the grammar.
  PCC_RecoveryInFunction,
  /// \brief Code completion occurs where only a type is permitted.
  PCC_Type,
  /// \brief Code completion occurs in a parenthesized expression, which
  /// might also be a type cast.
  PCC_ParenthesizedExpression,
  /// \brief Code completion occurs within a sequence of declaration
  /// specifiers within a function, method, or block.
  PCC_LocalDeclarationSpecifiers
};

void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path);
void CodeCompleteOrdinaryName(Scope *S,
                              ParserCompletionContext CompletionContext);
void CodeCompleteDeclSpec(Scope *S, DeclSpec &DS,
                          bool AllowNonIdentifiers,
                          bool AllowNestedNameSpecifiers);

struct CodeCompleteExpressionData;
void CodeCompleteExpression(Scope *S,
                            const CodeCompleteExpressionData &Data);
void CodeCompleteMemberReferenceExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc, bool IsArrow,
                                     bool IsBaseExprStatement);
void CodeCompletePostfixExpression(Scope *S, ExprResult LHS);
void CodeCompleteTag(Scope *S, unsigned TagSpec);
void CodeCompleteTypeQualifiers(DeclSpec &DS);
void CodeCompleteFunctionQualifiers(DeclSpec &DS, Declarator &D,
                                    const VirtSpecifiers *VS = nullptr);
void CodeCompleteBracketDeclarator(Scope *S);
void CodeCompleteCase(Scope *S);
void CodeCompleteCall(Scope *S, Expr *Fn, ArrayRef<Expr *> Args);
void CodeCompleteConstructor(Scope *S, QualType Type, SourceLocation Loc,
                             ArrayRef<Expr *> Args);
void CodeCompleteInitializer(Scope *S, Decl *D);
void CodeCompleteReturn(Scope *S);
void CodeCompleteAfterIf(Scope *S);
void CodeCompleteAssignmentRHS(Scope *S, Expr *LHS);

void CodeCompleteQualifiedId(Scope *S, CXXScopeSpec &SS,
                             bool EnteringContext);
void CodeCompleteUsing(Scope *S);
void CodeCompleteUsingDirective(Scope *S);
void CodeCompleteNamespaceDecl(Scope *S);
void CodeCompleteNamespaceAliasDecl(Scope *S);
void CodeCompleteOperatorName(Scope *S);
void CodeCompleteConstructorInitializer(
                              Decl *Constructor,
                              ArrayRef<CXXCtorInitializer *> Initializers);

void CodeCompleteLambdaIntroducer(Scope *S, LambdaIntroducer &Intro,
                                  bool AfterAmpersand);

void CodeCompleteObjCAtDirective(Scope *S);
void CodeCompleteObjCAtVisibility(Scope *S);
void CodeCompleteObjCAtStatement(Scope *S);
void CodeCompleteObjCAtExpression(Scope *S);
void CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS);
void CodeCompleteObjCPropertyGetter(Scope *S);
void CodeCompleteObjCPropertySetter(Scope *S);
void CodeCompleteObjCPassingType(Scope *S, ObjCDeclSpec &DS,
                                 bool IsParameter);
void CodeCompleteObjCMessageReceiver(Scope *S);
void CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression);
void CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression,
                                  bool IsSuper = false);
void CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
                                     ArrayRef<IdentifierInfo *> SelIdents,
                                     bool AtArgumentExpression,
                                     ObjCInterfaceDecl *Super = nullptr);
void CodeCompleteObjCForCollection(Scope *S,
                                   DeclGroupPtrTy IterationVar);
void CodeCompleteObjCSelector(Scope *S,
                              ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCProtocolReferences(
                                       ArrayRef<IdentifierLocPair> Protocols);
void CodeCompleteObjCProtocolDecl(Scope *S);
void CodeCompleteObjCInterfaceDecl(Scope *S);
void CodeCompleteObjCSuperclass(Scope *S,
                                IdentifierInfo *ClassName,
                                SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationDecl(Scope *S);
void CodeCompleteObjCInterfaceCategory(Scope *S,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationCategory(Scope *S,
                                            IdentifierInfo *ClassName,
                                            SourceLocation ClassNameLoc);
void CodeCompleteObjCPropertyDefinition(Scope *S);
void CodeCompleteObjCPropertySynthesizeIvar(Scope *S,
                                            IdentifierInfo *PropertyName);
void CodeCompleteObjCMethodDecl(Scope *S, Optional<bool> IsInstanceMethod,
                                ParsedType ReturnType);
void CodeCompleteObjCMethodDeclSelector(Scope *S,
                                        bool IsInstanceMethod,
                                        bool AtParameterName,
                                        ParsedType ReturnType,
                                        ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCClassPropertyRefExpr(Scope *S, IdentifierInfo &ClassName,
                                          SourceLocation ClassNameLoc,
                                          bool IsBaseExprStatement);
void CodeCompletePreprocessorDirective(bool InConditional);
void CodeCompleteInPreprocessorConditionalExclusion(Scope *S);
void CodeCompletePreprocessorMacroName(bool IsDefinition);
void CodeCompletePreprocessorExpression();
void CodeCompletePreprocessorMacroArgument(Scope *S,
                                           IdentifierInfo *Macro,
                                           MacroInfo *MacroInfo,
                                           unsigned Argument);
void CodeCompleteNaturalLanguage();
void CodeCompleteAvailabilityPlatformName();
void GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
                                 CodeCompletionTUInfo &CCTUInfo,
                SmallVectorImpl<CodeCompletionResult> &Results);
//@}

//===--------------------------------------------------------------------===//
// Extra semantic analysis beyond the C type system

10300public:
SourceLocation getLocationOfStringLiteralByte(const StringLiteral *SL,
                                              unsigned ByteNo) const;

10304private:
void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                      const ArraySubscriptExpr *ASE=nullptr,
                      bool AllowOnePastEnd=true, bool IndexNegated=false);
void CheckArrayAccess(const Expr *E);
// Used to grab the relevant information from a FormatAttr and a
// FunctionDeclaration.
struct FormatStringInfo {
  unsigned FormatIdx;
  unsigned FirstDataArg;
  bool HasVAListArg;
};

static bool getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
                                FormatStringInfo *FSI);
bool CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                       const FunctionProtoType *Proto);
bool CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation loc,
                         ArrayRef<const Expr *> Args);
bool CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
                      const FunctionProtoType *Proto);
bool CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto);
void CheckConstructorCall(FunctionDecl *FDecl,
                          ArrayRef<const Expr *> Args,
                          const FunctionProtoType *Proto,
                          SourceLocation Loc);

void checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
               const Expr *ThisArg, ArrayRef<const Expr *> Args,
               bool IsMemberFunction, SourceLocation Loc, SourceRange Range,
               VariadicCallType CallType);

bool CheckObjCString(Expr *Arg);
ExprResult CheckOSLogFormatStringArg(Expr *Arg);

ExprResult CheckBuiltinFunctionCall(FunctionDecl *FDecl,
                                    unsigned BuiltinID, CallExpr *TheCall);

bool CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
                                  unsigned MaxWidth);
bool CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool CheckAArch64BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckSystemZBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinGatherScatterScale(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall);
bool SemaBuiltinVAStartARMMicrosoft(CallExpr *Call);
bool SemaBuiltinUnorderedCompare(CallExpr *TheCall);
bool SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs);
bool SemaBuiltinVSX(CallExpr *TheCall);
bool SemaBuiltinOSLogFormat(CallExpr *TheCall);

10362public:
// Used by C++ template instantiation.
ExprResult SemaBuiltinShuffleVector(CallExpr *TheCall);
ExprResult SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
                                 SourceLocation BuiltinLoc,
                                 SourceLocation RParenLoc);

10369private:
bool SemaBuiltinPrefetch(CallExpr *TheCall);
bool SemaBuiltinAllocaWithAlign(CallExpr *TheCall);
bool SemaBuiltinAssume(CallExpr *TheCall);
bool SemaBuiltinAssumeAligned(CallExpr *TheCall);
bool SemaBuiltinLongjmp(CallExpr *TheCall);
bool SemaBuiltinSetjmp(CallExpr *TheCall);
ExprResult SemaBuiltinAtomicOverloaded(ExprResult TheCallResult);
ExprResult SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult);
ExprResult SemaAtomicOpsOverloaded(ExprResult TheCallResult,
                                   AtomicExpr::AtomicOp Op);
bool SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
                            llvm::APSInt &Result);
bool SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
                                 int Low, int High);
bool SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
                                    unsigned Multiple);
bool SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
                              int ArgNum, unsigned ExpectedFieldNum,
                              bool AllowName);
10389public:
enum FormatStringType {
  FST_Scanf,
  FST_Printf,
  FST_NSString,
  FST_Strftime,
  FST_Strfmon,
  FST_Kprintf,
  FST_FreeBSDKPrintf,
  FST_OSTrace,
  FST_OSLog,
  FST_Unknown
};
static FormatStringType GetFormatStringType(const FormatAttr *Format);

bool FormatStringHasSArg(const StringLiteral *FExpr);

static bool GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx);

10408private:
bool CheckFormatArguments(const FormatAttr *Format,
                          ArrayRef<const Expr *> Args,
                          bool IsCXXMember,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange Range,
                          llvm::SmallBitVector &CheckedVarArgs);
bool CheckFormatArguments(ArrayRef<const Expr *> Args,
                          bool HasVAListArg, unsigned format_idx,
                          unsigned firstDataArg, FormatStringType Type,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange range,
                          llvm::SmallBitVector &CheckedVarArgs);

void CheckAbsoluteValueFunction(const CallExpr *Call,
                                const FunctionDecl *FDecl);

void CheckMaxUnsignedZero(const CallExpr *Call, const FunctionDecl *FDecl);

void CheckMemaccessArguments(const CallExpr *Call,
                             unsigned BId,
                             IdentifierInfo *FnName);

void CheckStrlcpycatArguments(const CallExpr *Call,
                              IdentifierInfo *FnName);

void CheckStrncatArguments(const CallExpr *Call,
                           IdentifierInfo *FnName);

void CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
                        SourceLocation ReturnLoc,
                        bool isObjCMethod = false,
                        const AttrVec *Attrs = nullptr,
                        const FunctionDecl *FD = nullptr);

10443public:
void CheckFloatComparison(SourceLocation Loc, Expr *LHS, Expr *RHS);

10446private:
void CheckImplicitConversions(Expr *E, SourceLocation CC = SourceLocation());
void CheckBoolLikeConversion(Expr *E, SourceLocation CC);
void CheckForIntOverflow(Expr *E);
void CheckUnsequencedOperations(Expr *E);

/// \brief Perform semantic checks on a completed expression. This will either
/// be a full-expression or a default argument expression.
void CheckCompletedExpr(Expr *E, SourceLocation CheckLoc = SourceLocation(),
                        bool IsConstexpr = false);

void CheckBitFieldInitialization(SourceLocation InitLoc, FieldDecl *Field,
                                 Expr *Init);

/// Check if there is a field shadowing.
void CheckShadowInheritedFields(const SourceLocation &Loc,
                                DeclarationName FieldName,
                                const CXXRecordDecl *RD);

/// \brief Check if the given expression contains 'break' or 'continue'
/// statement that produces control flow different from GCC.
void CheckBreakContinueBinding(Expr *E);

/// \brief Check whether receiver is mutable ObjC container which
/// attempts to add itself into the container
void CheckObjCCircularContainer(ObjCMessageExpr *Message);

void AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE);
void AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
                               bool DeleteWasArrayForm);
10476public:
/// \brief Register a magic integral constant to be used as a type tag.
void RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
                                uint64_t MagicValue, QualType Type,
                                bool LayoutCompatible, bool MustBeNull);

struct TypeTagData {
  TypeTagData() {}

  TypeTagData(QualType Type, bool LayoutCompatible, bool MustBeNull) :
      Type(Type), LayoutCompatible(LayoutCompatible),
      MustBeNull(MustBeNull)
  {}

  QualType Type;

  /// If true, \c Type should be compared with other expression's types for
  /// layout-compatibility.
  unsigned LayoutCompatible : 1;
  unsigned MustBeNull : 1;
};

/// A pair of ArgumentKind identifier and magic value.  This uniquely
/// identifies the magic value.
typedef std::pair<const IdentifierInfo *, uint64_t> TypeTagMagicValue;

10502private:
/// \brief A map from magic value to type information.
std::unique_ptr<llvm::DenseMap<TypeTagMagicValue, TypeTagData>>
    TypeTagForDatatypeMagicValues;

/// \brief Peform checks on a call of a function with argument_with_type_tag
/// or pointer_with_type_tag attributes.
void CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
                              const ArrayRef<const Expr *> ExprArgs,
                              SourceLocation CallSiteLoc);

/// \brief Check if we are taking the address of a packed field
/// as this may be a problem if the pointer value is dereferenced.
void CheckAddressOfPackedMember(Expr *rhs);

/// \brief The parser's current scope.
///
/// The parser maintains this state here.
Scope *CurScope;

mutable IdentifierInfo *Ident_super;
mutable IdentifierInfo *Ident___float128;

/// Nullability type specifiers.
IdentifierInfo *Ident__Nonnull = nullptr;
IdentifierInfo *Ident__Nullable = nullptr;
IdentifierInfo *Ident__Null_unspecified = nullptr;

IdentifierInfo *Ident_NSError = nullptr;

/// \brief The handler for the FileChanged preprocessor events.
///
/// Used for diagnostics that implement custom semantic analysis for #include
/// directives, like -Wpragma-pack.
sema::SemaPPCallbacks *SemaPPCallbackHandler;

10538protected:
friend class Parser;
friend class InitializationSequence;
friend class ASTReader;
friend class ASTDeclReader;
friend class ASTWriter;

10545public:
/// Retrieve the keyword associated
IdentifierInfo *getNullabilityKeyword(NullabilityKind nullability);

/// The struct behind the CFErrorRef pointer.
RecordDecl *CFError = nullptr;

/// Retrieve the identifier "NSError".
IdentifierInfo *getNSErrorIdent();

/// \brief Retrieve the parser's current scope.
///
/// This routine must only be used when it is certain that semantic analysis
/// and the parser are in precisely the same context, which is not the case
/// when, e.g., we are performing any kind of template instantiation.
/// Therefore, the only safe places to use this scope are in the parser
/// itself and in routines directly invoked from the parser and *never* from
/// template substitution or instantiation.
Scope *getCurScope() const { return CurScope; }

void incrementMSManglingNumber() const {
  return CurScope->incrementMSManglingNumber();
}

IdentifierInfo *getSuperIdentifier() const;
IdentifierInfo *getFloat128Identifier() const;

Decl *getObjCDeclContext() const;

DeclContext *getCurLexicalContext() const {
  return OriginalLexicalContext ? OriginalLexicalContext : CurContext;
}

const DeclContext *getCurObjCLexicalContext() const {
  const DeclContext *DC = getCurLexicalContext();
  // A category implicitly has the attribute of the interface.
  if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(DC))
    DC = CatD->getClassInterface();
  return DC;
}

/// \brief To be used for checking whether the arguments being passed to
/// function exceeds the number of parameters expected for it.
static bool TooManyArguments(size_t NumParams, size_t NumArgs,
                             bool PartialOverloading = false) {
  // We check whether we're just after a comma in code-completion.
  if (NumArgs > 0 && PartialOverloading)
    return NumArgs + 1 > NumParams; // If so, we view as an extra argument.
  return NumArgs > NumParams;
}

// Emitting members of dllexported classes is delayed until the class
// (including field initializers) is fully parsed.
SmallVector<CXXRecordDecl*, 4> DelayedDllExportClasses;

10600private:
class SavePendingParsedClassStateRAII {
public:
  SavePendingParsedClassStateRAII(Sema &S) : S(S) { swapSavedState(); }

  ~SavePendingParsedClassStateRAII() {
    assert(S.DelayedExceptionSpecChecks.empty() &&(static_cast <bool> (S.DelayedExceptionSpecChecks.empty
() && "there shouldn't be any pending delayed exception spec checks"
) ? void (0) : __assert_fail ("S.DelayedExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10607, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed exception spec checks")(static_cast <bool> (S.DelayedExceptionSpecChecks.empty
() && "there shouldn't be any pending delayed exception spec checks"
) ? void (0) : __assert_fail ("S.DelayedExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10607, __extension__ __PRETTY_FUNCTION__));
    assert(S.DelayedDefaultedMemberExceptionSpecs.empty() &&(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10610, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed defaulted member "(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10610, __extension__ __PRETTY_FUNCTION__))
           "exception specs")(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10610, __extension__ __PRETTY_FUNCTION__));
    assert(S.DelayedDllExportClasses.empty() &&(static_cast <bool> (S.DelayedDllExportClasses.empty() &&
 "there shouldn't be any pending delayed DLL export classes")
 ? void (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10612, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed DLL export classes")(static_cast <bool> (S.DelayedDllExportClasses.empty() &&
 "there shouldn't be any pending delayed DLL export classes")
 ? void (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Sema/Sema.h"
, 10612, __extension__ __PRETTY_FUNCTION__));
    swapSavedState();
  }

private:
  Sema &S;
  decltype(DelayedExceptionSpecChecks) SavedExceptionSpecChecks;
  decltype(DelayedDefaultedMemberExceptionSpecs)
      SavedDefaultedMemberExceptionSpecs;
  decltype(DelayedDllExportClasses) SavedDllExportClasses;

  void swapSavedState() {
    SavedExceptionSpecChecks.swap(S.DelayedExceptionSpecChecks);
    SavedDefaultedMemberExceptionSpecs.swap(
        S.DelayedDefaultedMemberExceptionSpecs);
    SavedDllExportClasses.swap(S.DelayedDllExportClasses);
  }
};

/// \brief Helper class that collects misaligned member designations and
/// their location info for delayed diagnostics.
struct MisalignedMember {
  Expr *E;
  RecordDecl *RD;
  ValueDecl *MD;
  CharUnits Alignment;

  MisalignedMember() : E(), RD(), MD(), Alignment() {}
  MisalignedMember(Expr *E, RecordDecl *RD, ValueDecl *MD,
                   CharUnits Alignment)
      : E(E), RD(RD), MD(MD), Alignment(Alignment) {}
  explicit MisalignedMember(Expr *E)
      : MisalignedMember(E, nullptr, nullptr, CharUnits()) {}

  bool operator==(const MisalignedMember &m) { return this->E == m.E; }
};
/// \brief Small set of gathered accesses to potentially misaligned members
/// due to the packed attribute.
SmallVector<MisalignedMember, 4> MisalignedMembers;

/// \brief Adds an expression to the set of gathered misaligned members.
void AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
                                   CharUnits Alignment);

10656public:
/// \brief Diagnoses the current set of gathered accesses. This typically
/// happens at full expression level. The set is cleared after emitting the
/// diagnostics.
void DiagnoseMisalignedMembers();

/// \brief This function checks if the expression is in the sef of potentially
/// misaligned members and it is converted to some pointer type T with lower
/// or equal alignment requirements. If so it removes it. This is used when
/// we do not want to diagnose such misaligned access (e.g. in conversions to
/// void*).
void DiscardMisalignedMemberAddress(const Type *T, Expr *E);

/// \brief This function calls Action when it determines that E designates a
/// misaligned member due to the packed attribute. This is used to emit
/// local diagnostics like in reference binding.
void RefersToMemberWithReducedAlignment(
    Expr *E,
    llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
        Action);
10676};

10678/// \brief RAII object that enters a new expression evaluation context.
10679class EnterExpressionEvaluationContext {
Sema &Actions;
bool Entered = true;

10683public:

EnterExpressionEvaluationContext(Sema &Actions,
                                 Sema::ExpressionEvaluationContext NewContext,
                                 Decl *LambdaContextDecl = nullptr,
                                 bool IsDecltype = false,
                                 bool ShouldEnter = true)
    : Actions(Actions), Entered(ShouldEnter) {
  if (Entered)
    Actions.PushExpressionEvaluationContext(NewContext, LambdaContextDecl,
                                            IsDecltype);
}
EnterExpressionEvaluationContext(Sema &Actions,
                                 Sema::ExpressionEvaluationContext NewContext,
                                 Sema::ReuseLambdaContextDecl_t,
                                 bool IsDecltype = false)
  : Actions(Actions) {
  Actions.PushExpressionEvaluationContext(NewContext,
                                          Sema::ReuseLambdaContextDecl,
                                          IsDecltype);
}

enum InitListTag { InitList };
EnterExpressionEvaluationContext(Sema &Actions, InitListTag,
                                 bool ShouldEnter = true)
    : Actions(Actions), Entered(false) {
  // In C++11 onwards, narrowing checks are performed on the contents of
  // braced-init-lists, even when they occur within unevaluated operands.
  // Therefore we still need to instantiate constexpr functions used in such
  // a context.
  if (ShouldEnter && Actions.isUnevaluatedContext() &&
      Actions.getLangOpts().CPlusPlus11) {
    Actions.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::UnevaluatedList, nullptr, false);
    Entered = true;
  }
}

~EnterExpressionEvaluationContext() {
  if (Entered)
    Actions.PopExpressionEvaluationContext();
}
10725};

10727DeductionFailureInfo
10728MakeDeductionFailureInfo(ASTContext &Context, Sema::TemplateDeductionResult TDK,
                       sema::TemplateDeductionInfo &Info);

10731/// \brief Contains a late templated function.
10732/// Will be parsed at the end of the translation unit, used by Sema & Parser.
10733struct LateParsedTemplate {
CachedTokens Toks;
/// \brief The template function declaration to be late parsed.
Decl *D;
10737};

10739} // end namespace clang

10741namespace llvm {
10742// Hash a FunctionDeclAndLoc by looking at both its FunctionDecl and its
10743// SourceLocation.
10744template <> struct DenseMapInfo<clang::Sema::FunctionDeclAndLoc> {
using FunctionDeclAndLoc = clang::Sema::FunctionDeclAndLoc;
using FDBaseInfo = DenseMapInfo<clang::CanonicalDeclPtr<clang::FunctionDecl>>;

static FunctionDeclAndLoc getEmptyKey() {
  return {FDBaseInfo::getEmptyKey(), clang::SourceLocation()};
}

static FunctionDeclAndLoc getTombstoneKey() {
  return {FDBaseInfo::getTombstoneKey(), clang::SourceLocation()};
}

static unsigned getHashValue(const FunctionDeclAndLoc &FDL) {
  return hash_combine(FDBaseInfo::getHashValue(FDL.FD),
                      FDL.Loc.getRawEncoding());
}

static bool isEqual(const FunctionDeclAndLoc &LHS,
                    const FunctionDeclAndLoc &RHS) {
  return LHS.FD == RHS.FD && LHS.Loc == RHS.Loc;
}
10765};
10766} // namespace llvm

10768#endif

←

/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h

1//===--- PartialDiagnostic.h - Diagnostic "closures" ------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9///
10/// \file
11/// \brief Implements a partial diagnostic that can be emitted anwyhere
12/// in a DiagnosticBuilder stream.
13///
14//===----------------------------------------------------------------------===//

16#ifndef LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H
17#define LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H

19#include "clang/Basic/Diagnostic.h"
20#include "clang/Basic/SourceLocation.h"
21#include "llvm/ADT/STLExtras.h"
22#include "llvm/Support/Compiler.h"
23#include "llvm/Support/DataTypes.h"
24#include <cassert>

26namespace clang {

28class PartialDiagnostic {
29public:
enum {
    // The MaxArguments and MaxFixItHints member enum values from
    // DiagnosticsEngine are private but DiagnosticsEngine declares
    // PartialDiagnostic a friend.  These enum values are redeclared
    // here so that the nested Storage class below can access them.
    MaxArguments = DiagnosticsEngine::MaxArguments
};

struct Storage {
  Storage() : NumDiagArgs(0) { }

  enum {
      /// \brief The maximum number of arguments we can hold. We
      /// currently only support up to 10 arguments (%0-%9).
      ///
      /// A single diagnostic with more than that almost certainly has to
      /// be simplified anyway.
      MaxArguments = PartialDiagnostic::MaxArguments
  };

  /// \brief The number of entries in Arguments.
  unsigned char NumDiagArgs;

  /// \brief Specifies for each argument whether it is in DiagArgumentsStr
  /// or in DiagArguments.
  unsigned char DiagArgumentsKind[MaxArguments];

  /// \brief The values for the various substitution positions.
  ///
  /// This is used when the argument is not an std::string. The specific value
  /// is mangled into an intptr_t and the interpretation depends on exactly
  /// what sort of argument kind it is.
  intptr_t DiagArgumentsVal[MaxArguments];

  /// \brief The values for the various substitution positions that have
  /// string arguments.
  std::string DiagArgumentsStr[MaxArguments];

  /// \brief The list of ranges added to this diagnostic.
  SmallVector<CharSourceRange, 8> DiagRanges;

  /// \brief If valid, provides a hint with some code to insert, remove, or
  /// modify at a particular position.
  SmallVector<FixItHint, 6>  FixItHints;
};

/// \brief An allocator for Storage objects, which uses a small cache to
/// objects, used to reduce malloc()/free() traffic for partial diagnostics.
class StorageAllocator {
  static const unsigned NumCached = 16;
  Storage Cached[NumCached];
  Storage *FreeList[NumCached];
  unsigned NumFreeListEntries;

public:
  StorageAllocator();
  ~StorageAllocator();

  /// \brief Allocate new storage.
  Storage *Allocate() {
    if (NumFreeListEntries == 0)
      return new Storage;

    Storage *Result = FreeList[--NumFreeListEntries];
    Result->NumDiagArgs = 0;
    Result->DiagRanges.clear();
    Result->FixItHints.clear();
    return Result;
  }

  /// \brief Free the given storage object.
  void Deallocate(Storage *S) {
    if (S >= Cached && S <= Cached + NumCached) {
      FreeList[NumFreeListEntries++] = S;
      return;
    }

    delete S;
  }
};

111private:
// NOTE: Sema assumes that PartialDiagnostic is location-invariant
// in the sense that its bits can be safely memcpy'ed and destructed
// in the new location.

/// \brief The diagnostic ID.
mutable unsigned DiagID;

/// \brief Storage for args and ranges.
mutable Storage *DiagStorage;

/// \brief Allocator used to allocate storage for this diagnostic.
StorageAllocator *Allocator;

/// \brief Retrieve storage for this particular diagnostic.
Storage *getStorage() const {
  if (DiagStorage)
14
←
Taking false branch→
    return DiagStorage;

  if (Allocator)
15
←
Assuming the condition is false→
16
←
Taking false branch→
    DiagStorage = Allocator->Allocate();
  else {
    assert(Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))(static_cast <bool> (Allocator != reinterpret_cast<StorageAllocator
 *>(~uintptr_t(0))) ? void (0) : __assert_fail ("Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0))"
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 133, __extension__ __PRETTY_FUNCTION__));
    DiagStorage = new Storage;
17
←
Memory is allocated→
  }
  return DiagStorage;
}

void freeStorage() {
  if (!DiagStorage)
    return;

  // The hot path for PartialDiagnostic is when we just used it to wrap an ID
  // (typically so we have the flexibility of passing a more complex
  // diagnostic into the callee, but that does not commonly occur).
  //
  // Split this out into a slow function for silly compilers (*cough*) which
  // can't do decent partial inlining.
  freeStorageSlow();
}

void freeStorageSlow() {
  if (Allocator)
    Allocator->Deallocate(DiagStorage);
  else if (Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))
    delete DiagStorage;
  DiagStorage = nullptr;
}

void AddSourceRange(const CharSourceRange &R) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->DiagRanges.push_back(R);
}

void AddFixItHint(const FixItHint &Hint) const {
  if (Hint.isNull())
    return;

  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->FixItHints.push_back(Hint);
}

177public:
struct NullDiagnostic {};
/// \brief Create a null partial diagnostic, which cannot carry a payload,
/// and only exists to be swapped with a real partial diagnostic.
PartialDiagnostic(NullDiagnostic)
  : DiagID(0), DiagStorage(nullptr), Allocator(nullptr) { }

PartialDiagnostic(unsigned DiagID, StorageAllocator &Allocator)
  : DiagID(DiagID), DiagStorage(nullptr), Allocator(&Allocator) { }

PartialDiagnostic(const PartialDiagnostic &Other)
  : DiagID(Other.DiagID), DiagStorage(nullptr), Allocator(Other.Allocator)
{
  if (Other.DiagStorage) {
    DiagStorage = getStorage();
    *DiagStorage = *Other.DiagStorage;
  }
}

PartialDiagnostic(PartialDiagnostic &&Other)
  : DiagID(Other.DiagID), DiagStorage(Other.DiagStorage),
    Allocator(Other.Allocator) {
  Other.DiagStorage = nullptr;
}

PartialDiagnostic(const PartialDiagnostic &Other, Storage *DiagStorage)
  : DiagID(Other.DiagID), DiagStorage(DiagStorage),
    Allocator(reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))
{
  if (Other.DiagStorage)
    *this->DiagStorage = *Other.DiagStorage;
}

PartialDiagnostic(const Diagnostic &Other, StorageAllocator &Allocator)
  : DiagID(Other.getID()), DiagStorage(nullptr), Allocator(&Allocator)
{
  // Copy arguments.
  for (unsigned I = 0, N = Other.getNumArgs(); I != N; ++I) {
    if (Other.getArgKind(I) == DiagnosticsEngine::ak_std_string)
      AddString(Other.getArgStdStr(I));
    else
      AddTaggedVal(Other.getRawArg(I), Other.getArgKind(I));
  }

  // Copy source ranges.
  for (unsigned I = 0, N = Other.getNumRanges(); I != N; ++I)
    AddSourceRange(Other.getRange(I));

  // Copy fix-its.
  for (unsigned I = 0, N = Other.getNumFixItHints(); I != N; ++I)
    AddFixItHint(Other.getFixItHint(I));
}

PartialDiagnostic &operator=(const PartialDiagnostic &Other) {
  DiagID = Other.DiagID;
  if (Other.DiagStorage) {
    if (!DiagStorage)
      DiagStorage = getStorage();

    *DiagStorage = *Other.DiagStorage;
  } else {
    freeStorage();
  }

  return *this;
}

PartialDiagnostic &operator=(PartialDiagnostic &&Other) {
  freeStorage();

  DiagID = Other.DiagID;
  DiagStorage = Other.DiagStorage;
  Allocator = Other.Allocator;

  Other.DiagStorage = nullptr;
  return *this;
}

~PartialDiagnostic() {
  freeStorage();
}

void swap(PartialDiagnostic &PD) {
  std::swap(DiagID, PD.DiagID);
  std::swap(DiagStorage, PD.DiagStorage);
  std::swap(Allocator, PD.Allocator);
}

unsigned getDiagID() const { return DiagID; }

void AddTaggedVal(intptr_t V, DiagnosticsEngine::ArgumentKind Kind) const {
  if (!DiagStorage)
11
←
Assuming the condition is true→
12
←
Taking true branch→
    DiagStorage = getStorage();
13
←
Calling 'PartialDiagnostic::getStorage'→
18
←
Returned allocated memory→

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 272, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 272, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs] = Kind;
  DiagStorage->DiagArgumentsVal[DiagStorage->NumDiagArgs++] = V;
}

void AddString(StringRef V) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 282, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 282, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs]
    = DiagnosticsEngine::ak_std_string;
  DiagStorage->DiagArgumentsStr[DiagStorage->NumDiagArgs++] = V;
}

void Emit(const DiagnosticBuilder &DB) const {
  if (!DiagStorage)
    return;

  // Add all arguments.
  for (unsigned i = 0, e = DiagStorage->NumDiagArgs; i != e; ++i) {
    if ((DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]
          == DiagnosticsEngine::ak_std_string)
      DB.AddString(DiagStorage->DiagArgumentsStr[i]);
    else
      DB.AddTaggedVal(DiagStorage->DiagArgumentsVal[i],
          (DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]);
  }

  // Add all ranges.
  for (const CharSourceRange &Range : DiagStorage->DiagRanges)
    DB.AddSourceRange(Range);

  // Add all fix-its.
  for (const FixItHint &Fix : DiagStorage->FixItHints)
    DB.AddFixItHint(Fix);
}

void EmitToString(DiagnosticsEngine &Diags,
                  SmallVectorImpl<char> &Buf) const {
  // FIXME: It should be possible to render a diagnostic to a string without
  //        messing with the state of the diagnostics engine.
  DiagnosticBuilder DB(Diags.Report(getDiagID()));
  Emit(DB);
  DB.FlushCounts();
  Diagnostic(&Diags).FormatDiagnostic(Buf);
  DB.Clear();
  Diags.Clear();
}

/// \brief Clear out this partial diagnostic, giving it a new diagnostic ID
/// and removing all of its arguments, ranges, and fix-it hints.
void Reset(unsigned DiagID = 0) {
  this->DiagID = DiagID;
  freeStorage();
}

bool hasStorage() const { return DiagStorage != nullptr; }

/// Retrieve the string argument at the given index.
StringRef getStringArg(unsigned I) {
  assert(DiagStorage && "No diagnostic storage?")(static_cast <bool> (DiagStorage && "No diagnostic storage?"
) ? void (0) : __assert_fail ("DiagStorage && \"No diagnostic storage?\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 334, __extension__ __PRETTY_FUNCTION__));
  assert(I < DiagStorage->NumDiagArgs && "Not enough diagnostic args")(static_cast <bool> (I < DiagStorage->NumDiagArgs
 && "Not enough diagnostic args") ? void (0) : __assert_fail
 ("I < DiagStorage->NumDiagArgs && \"Not enough diagnostic args\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 335, __extension__ __PRETTY_FUNCTION__));
  assert(DiagStorage->DiagArgumentsKind[I](static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 337, __extension__ __PRETTY_FUNCTION__))
           == DiagnosticsEngine::ak_std_string && "Not a string arg")(static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 337, __extension__ __PRETTY_FUNCTION__));
  return DiagStorage->DiagArgumentsStr[I];
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           unsigned I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_uint);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           int I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_sint);
10
←
Calling 'PartialDiagnostic::AddTaggedVal'→
19
←
Returned allocated memory→
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const char *S) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(S),
                  DiagnosticsEngine::ak_c_string);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  StringRef S) {

  PD.AddString(S);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const IdentifierInfo *II) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(II),
                  DiagnosticsEngine::ak_identifierinfo);
  return PD;
}

// Adds a DeclContext to the diagnostic. The enable_if template magic is here
// so that we only match those arguments that are (statically) DeclContexts;
// other arguments that derive from DeclContext (e.g., RecordDecls) will not
// match.
template<typename T>
friend inline
typename std::enable_if<std::is_same<T, DeclContext>::value,
                        const PartialDiagnostic &>::type
operator<<(const PartialDiagnostic &PD, T *DC) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(DC),
                  DiagnosticsEngine::ak_declcontext);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  SourceRange R) {
  PD.AddSourceRange(CharSourceRange::getTokenRange(R));
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const CharSourceRange &R) {
  PD.AddSourceRange(R);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           const FixItHint &Hint) {
  PD.AddFixItHint(Hint);
  return PD;
}

406};

408inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         const PartialDiagnostic &PD) {
PD.Emit(DB);
return DB;
412}

414/// \brief A partial diagnostic along with the source location where this
415/// diagnostic occurs.
416typedef std::pair<SourceLocation, PartialDiagnostic> PartialDiagnosticAt;

418}  // end namespace clang
419#endif