/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp

Bug Summary

File:	tools/clang/lib/Sema/SemaCUDA.cpp
Warning:	line 837, column 51 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 SemaCUDA.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~svn326425/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326425/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326425/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~svn326425/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-2018-03-01-211340-26438-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp

/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp

→

1//===--- SemaCUDA.cpp - Semantic Analysis for CUDA constructs -------------===//
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/// \file
10/// \brief This file implements semantic analysis for CUDA constructs.
11///
12//===----------------------------------------------------------------------===//

14#include "clang/AST/ASTContext.h"
15#include "clang/AST/Decl.h"
16#include "clang/AST/ExprCXX.h"
17#include "clang/Lex/Preprocessor.h"
18#include "clang/Sema/Lookup.h"
19#include "clang/Sema/Sema.h"
20#include "clang/Sema/SemaDiagnostic.h"
21#include "clang/Sema/SemaInternal.h"
22#include "clang/Sema/Template.h"
23#include "llvm/ADT/Optional.h"
24#include "llvm/ADT/SmallVector.h"
25using namespace clang;

27void Sema::PushForceCUDAHostDevice() {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 28, __extension__ __PRETTY_FUNCTION__));
ForceCUDAHostDeviceDepth++;
30}

32bool Sema::PopForceCUDAHostDevice() {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 33, __extension__ __PRETTY_FUNCTION__));
if (ForceCUDAHostDeviceDepth == 0)
  return false;
ForceCUDAHostDeviceDepth--;
return true;
38}

40ExprResult Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
                                       MultiExprArg ExecConfig,
                                       SourceLocation GGGLoc) {
FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl();
if (!ConfigDecl)
  return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use)
                   << "cudaConfigureCall");
QualType ConfigQTy = ConfigDecl->getType();

DeclRefExpr *ConfigDR = new (Context)
    DeclRefExpr(ConfigDecl, false, ConfigQTy, VK_LValue, LLLLoc);
MarkFunctionReferenced(LLLLoc, ConfigDecl);

return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, nullptr,
                     /*IsExecConfig=*/true);
55}

57Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const AttributeList *Attr) {
bool HasHostAttr = false;
bool HasDeviceAttr = false;
bool HasGlobalAttr = false;
bool HasInvalidTargetAttr = false;
while (Attr) {
  switch(Attr->getKind()){
  case AttributeList::AT_CUDAGlobal:
    HasGlobalAttr = true;
    break;
  case AttributeList::AT_CUDAHost:
    HasHostAttr = true;
    break;
  case AttributeList::AT_CUDADevice:
    HasDeviceAttr = true;
    break;
  case AttributeList::AT_CUDAInvalidTarget:
    HasInvalidTargetAttr = true;
    break;
  default:
    break;
  }
  Attr = Attr->getNext();
}
if (HasInvalidTargetAttr)
  return CFT_InvalidTarget;

if (HasGlobalAttr)
  return CFT_Global;

if (HasHostAttr && HasDeviceAttr)
  return CFT_HostDevice;

if (HasDeviceAttr)
  return CFT_Device;

return CFT_Host;
94}

96template <typename A>
97static bool hasAttr(const FunctionDecl *D, bool IgnoreImplicitAttr) {
return D->hasAttrs() && llvm::any_of(D->getAttrs(), [&](Attr *Attribute) {
         return isa<A>(Attribute) &&
                !(IgnoreImplicitAttr && Attribute->isImplicit());
       });
102}

104/// IdentifyCUDATarget - Determine the CUDA compilation target for this function
105Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D,
                                                bool IgnoreImplicitHDAttr) {
// Code that lives outside a function is run on the host.
if (D == nullptr)
  return CFT_Host;

if (D->hasAttr<CUDAInvalidTargetAttr>())
  return CFT_InvalidTarget;

if (D->hasAttr<CUDAGlobalAttr>())
  return CFT_Global;

if (hasAttr<CUDADeviceAttr>(D, IgnoreImplicitHDAttr)) {
  if (hasAttr<CUDAHostAttr>(D, IgnoreImplicitHDAttr))
    return CFT_HostDevice;
  return CFT_Device;
} else if (hasAttr<CUDAHostAttr>(D, IgnoreImplicitHDAttr)) {
  return CFT_Host;
} else if (D->isImplicit() && !IgnoreImplicitHDAttr) {
  // Some implicit declarations (like intrinsic functions) are not marked.
  // Set the most lenient target on them for maximal flexibility.
  return CFT_HostDevice;
}

return CFT_Host;
130}

132// * CUDA Call preference table
133//
134// F - from,
135// T - to
136// Ph - preference in host mode
137// Pd - preference in device mode
138// H  - handled in (x)
139// Preferences: N:native, SS:same side, HD:host-device, WS:wrong side, --:never.
140//
141// | F  | T  | Ph  | Pd  |  H  |
142// |----+----+-----+-----+-----+
143// | d  | d  | N   | N   | (c) |
144// | d  | g  | --  | --  | (a) |
145// | d  | h  | --  | --  | (e) |
146// | d  | hd | HD  | HD  | (b) |
147// | g  | d  | N   | N   | (c) |
148// | g  | g  | --  | --  | (a) |
149// | g  | h  | --  | --  | (e) |
150// | g  | hd | HD  | HD  | (b) |
151// | h  | d  | --  | --  | (e) |
152// | h  | g  | N   | N   | (c) |
153// | h  | h  | N   | N   | (c) |
154// | h  | hd | HD  | HD  | (b) |
155// | hd | d  | WS  | SS  | (d) |
156// | hd | g  | SS  | --  |(d/a)|
157// | hd | h  | SS  | WS  | (d) |
158// | hd | hd | HD  | HD  | (b) |

160Sema::CUDAFunctionPreference
161Sema::IdentifyCUDAPreference(const FunctionDecl *Caller,
                           const FunctionDecl *Callee) {
assert(Callee && "Callee must be valid.")(static_cast <bool> (Callee && "Callee must be valid."
) ? void (0) : __assert_fail ("Callee && \"Callee must be valid.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 163, __extension__ __PRETTY_FUNCTION__));
CUDAFunctionTarget CallerTarget = IdentifyCUDATarget(Caller);
CUDAFunctionTarget CalleeTarget = IdentifyCUDATarget(Callee);

// If one of the targets is invalid, the check always fails, no matter what
// the other target is.
if (CallerTarget == CFT_InvalidTarget || CalleeTarget == CFT_InvalidTarget)
  return CFP_Never;

// (a) Can't call global from some contexts until we support CUDA's
// dynamic parallelism.
if (CalleeTarget == CFT_Global &&
    (CallerTarget == CFT_Global || CallerTarget == CFT_Device))
  return CFP_Never;

// (b) Calling HostDevice is OK for everyone.
if (CalleeTarget == CFT_HostDevice)
  return CFP_HostDevice;

// (c) Best case scenarios
if (CalleeTarget == CallerTarget ||
    (CallerTarget == CFT_Host && CalleeTarget == CFT_Global) ||
    (CallerTarget == CFT_Global && CalleeTarget == CFT_Device))
  return CFP_Native;

// (d) HostDevice behavior depends on compilation mode.
if (CallerTarget == CFT_HostDevice) {
  // It's OK to call a compilation-mode matching function from an HD one.
  if ((getLangOpts().CUDAIsDevice && CalleeTarget == CFT_Device) ||
      (!getLangOpts().CUDAIsDevice &&
       (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)))
    return CFP_SameSide;

  // Calls from HD to non-mode-matching functions (i.e., to host functions
  // when compiling in device mode or to device functions when compiling in
  // host mode) are allowed at the sema level, but eventually rejected if
  // they're ever codegened.  TODO: Reject said calls earlier.
  return CFP_WrongSide;
}

// (e) Calling across device/host boundary is not something you should do.
if ((CallerTarget == CFT_Host && CalleeTarget == CFT_Device) ||
    (CallerTarget == CFT_Device && CalleeTarget == CFT_Host) ||
    (CallerTarget == CFT_Global && CalleeTarget == CFT_Host))
  return CFP_Never;

llvm_unreachable("All cases should've been handled by now.")::llvm::llvm_unreachable_internal("All cases should've been handled by now."
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 209);
210}

212void Sema::EraseUnwantedCUDAMatches(
  const FunctionDecl *Caller,
  SmallVectorImpl<std::pair<DeclAccessPair, FunctionDecl *>> &Matches) {
if (Matches.size() <= 1)
  return;

using Pair = std::pair<DeclAccessPair, FunctionDecl*>;

// Gets the CUDA function preference for a call from Caller to Match.
auto GetCFP = [&](const Pair &Match) {
  return IdentifyCUDAPreference(Caller, Match.second);
};

// Find the best call preference among the functions in Matches.
CUDAFunctionPreference BestCFP = GetCFP(*std::max_element(
    Matches.begin(), Matches.end(),
    [&](const Pair &M1, const Pair &M2) { return GetCFP(M1) < GetCFP(M2); }));

// Erase all functions with lower priority.
llvm::erase_if(Matches,
               [&](const Pair &Match) { return GetCFP(Match) < BestCFP; });
233}

235/// When an implicitly-declared special member has to invoke more than one
236/// base/field special member, conflicts may occur in the targets of these
237/// members. For example, if one base's member __host__ and another's is
238/// __device__, it's a conflict.
239/// This function figures out if the given targets \param Target1 and
240/// \param Target2 conflict, and if they do not it fills in
241/// \param ResolvedTarget with a target that resolves for both calls.
242/// \return true if there's a conflict, false otherwise.
243static bool
244resolveCalleeCUDATargetConflict(Sema::CUDAFunctionTarget Target1,
                              Sema::CUDAFunctionTarget Target2,
                              Sema::CUDAFunctionTarget *ResolvedTarget) {
// Only free functions and static member functions may be global.
assert(Target1 != Sema::CFT_Global)(static_cast <bool> (Target1 != Sema::CFT_Global) ? void
 (0) : __assert_fail ("Target1 != Sema::CFT_Global", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 248, __extension__ __PRETTY_FUNCTION__));
assert(Target2 != Sema::CFT_Global)(static_cast <bool> (Target2 != Sema::CFT_Global) ? void
 (0) : __assert_fail ("Target2 != Sema::CFT_Global", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 249, __extension__ __PRETTY_FUNCTION__));

if (Target1 == Sema::CFT_HostDevice) {
  *ResolvedTarget = Target2;
} else if (Target2 == Sema::CFT_HostDevice) {
  *ResolvedTarget = Target1;
} else if (Target1 != Target2) {
  return true;
} else {
  *ResolvedTarget = Target1;
}

return false;
262}

264bool Sema::inferCUDATargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl,
                                                 CXXSpecialMember CSM,
                                                 CXXMethodDecl *MemberDecl,
                                                 bool ConstRHS,
                                                 bool Diagnose) {
llvm::Optional<CUDAFunctionTarget> InferredTarget;

// We're going to invoke special member lookup; mark that these special
// members are called from this one, and not from its caller.
ContextRAII MethodContext(*this, MemberDecl);

// Look for special members in base classes that should be invoked from here.
// Infer the target of this member base on the ones it should call.
// Skip direct and indirect virtual bases for abstract classes.
llvm::SmallVector<const CXXBaseSpecifier *, 16> Bases;
for (const auto &B : ClassDecl->bases()) {
  if (!B.isVirtual()) {
    Bases.push_back(&B);
  }
}

if (!ClassDecl->isAbstract()) {
  for (const auto &VB : ClassDecl->vbases()) {
    Bases.push_back(&VB);
  }
}

for (const auto *B : Bases) {
  const RecordType *BaseType = B->getType()->getAs<RecordType>();
  if (!BaseType) {
    continue;
  }

  CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl());
  Sema::SpecialMemberOverloadResult SMOR =
      LookupSpecialMember(BaseClassDecl, CSM,
                          /* ConstArg */ ConstRHS,
                          /* VolatileArg */ false,
                          /* RValueThis */ false,
                          /* ConstThis */ false,
                          /* VolatileThis */ false);

  if (!SMOR.getMethod())
    continue;

  CUDAFunctionTarget BaseMethodTarget = IdentifyCUDATarget(SMOR.getMethod());
  if (!InferredTarget.hasValue()) {
    InferredTarget = BaseMethodTarget;
  } else {
    bool ResolutionError = resolveCalleeCUDATargetConflict(
        InferredTarget.getValue(), BaseMethodTarget,
        InferredTarget.getPointer());
    if (ResolutionError) {
      if (Diagnose) {
        Diag(ClassDecl->getLocation(),
             diag::note_implicit_member_target_infer_collision)
            << (unsigned)CSM << InferredTarget.getValue() << BaseMethodTarget;
      }
      MemberDecl->addAttr(CUDAInvalidTargetAttr::CreateImplicit(Context));
      return true;
    }
  }
}

// Same as for bases, but now for special members of fields.
for (const auto *F : ClassDecl->fields()) {
  if (F->isInvalidDecl()) {
    continue;
  }

  const RecordType *FieldType =
      Context.getBaseElementType(F->getType())->getAs<RecordType>();
  if (!FieldType) {
    continue;
  }

  CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(FieldType->getDecl());
  Sema::SpecialMemberOverloadResult SMOR =
      LookupSpecialMember(FieldRecDecl, CSM,
                          /* ConstArg */ ConstRHS && !F->isMutable(),
                          /* VolatileArg */ false,
                          /* RValueThis */ false,
                          /* ConstThis */ false,
                          /* VolatileThis */ false);

  if (!SMOR.getMethod())
    continue;

  CUDAFunctionTarget FieldMethodTarget =
      IdentifyCUDATarget(SMOR.getMethod());
  if (!InferredTarget.hasValue()) {
    InferredTarget = FieldMethodTarget;
  } else {
    bool ResolutionError = resolveCalleeCUDATargetConflict(
        InferredTarget.getValue(), FieldMethodTarget,
        InferredTarget.getPointer());
    if (ResolutionError) {
      if (Diagnose) {
        Diag(ClassDecl->getLocation(),
             diag::note_implicit_member_target_infer_collision)
            << (unsigned)CSM << InferredTarget.getValue()
            << FieldMethodTarget;
      }
      MemberDecl->addAttr(CUDAInvalidTargetAttr::CreateImplicit(Context));
      return true;
    }
  }
}

if (InferredTarget.hasValue()) {
  if (InferredTarget.getValue() == CFT_Device) {
    MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context));
  } else if (InferredTarget.getValue() == CFT_Host) {
    MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context));
  } else {
    MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context));
    MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context));
  }
} else {
  // If no target was inferred, mark this member as __host__ __device__;
  // it's the least restrictive option that can be invoked from any target.
  MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context));
  MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context));
}

return false;
390}

392bool Sema::isEmptyCudaConstructor(SourceLocation Loc, CXXConstructorDecl *CD) {
if (!CD->isDefined() && CD->isTemplateInstantiation())
  InstantiateFunctionDefinition(Loc, CD->getFirstDecl());

// (E.2.3.1, CUDA 7.5) A constructor for a class type is considered
// empty at a point in the translation unit, if it is either a
// trivial constructor
if (CD->isTrivial())
  return true;

// ... or it satisfies all of the following conditions:
// The constructor function has been defined.
// The constructor function has no parameters,
// and the function body is an empty compound statement.
if (!(CD->hasTrivialBody() && CD->getNumParams() == 0))
  return false;

// Its class has no virtual functions and no virtual base classes.
if (CD->getParent()->isDynamicClass())
  return false;

// The only form of initializer allowed is an empty constructor.
// This will recursively check all base classes and member initializers
if (!llvm::all_of(CD->inits(), [&](const CXXCtorInitializer *CI) {
      if (const CXXConstructExpr *CE =
              dyn_cast<CXXConstructExpr>(CI->getInit()))
        return isEmptyCudaConstructor(Loc, CE->getConstructor());
      return false;
    }))
  return false;

return true;
424}

426bool Sema::isEmptyCudaDestructor(SourceLocation Loc, CXXDestructorDecl *DD) {
// No destructor -> no problem.
if (!DD)
  return true;

if (!DD->isDefined() && DD->isTemplateInstantiation())
  InstantiateFunctionDefinition(Loc, DD->getFirstDecl());

// (E.2.3.1, CUDA 7.5) A destructor for a class type is considered
// empty at a point in the translation unit, if it is either a
// trivial constructor
if (DD->isTrivial())
  return true;

// ... or it satisfies all of the following conditions:
// The destructor function has been defined.
// and the function body is an empty compound statement.
if (!DD->hasTrivialBody())
  return false;

const CXXRecordDecl *ClassDecl = DD->getParent();

// Its class has no virtual functions and no virtual base classes.
if (ClassDecl->isDynamicClass())
  return false;

// Only empty destructors are allowed. This will recursively check
// destructors for all base classes...
if (!llvm::all_of(ClassDecl->bases(), [&](const CXXBaseSpecifier &BS) {
      if (CXXRecordDecl *RD = BS.getType()->getAsCXXRecordDecl())
        return isEmptyCudaDestructor(Loc, RD->getDestructor());
      return true;
    }))
  return false;

// ... and member fields.
if (!llvm::all_of(ClassDecl->fields(), [&](const FieldDecl *Field) {
      if (CXXRecordDecl *RD = Field->getType()
                                  ->getBaseElementTypeUnsafe()
                                  ->getAsCXXRecordDecl())
        return isEmptyCudaDestructor(Loc, RD->getDestructor());
      return true;
    }))
  return false;

return true;
472}

474// With -fcuda-host-device-constexpr, an unattributed constexpr function is
475// treated as implicitly __host__ __device__, unless:
476//  * it is a variadic function (device-side variadic functions are not
477//    allowed), or
478//  * a __device__ function with this signature was already declared, in which
479//    case in which case we output an error, unless the __device__ decl is in a
480//    system header, in which case we leave the constexpr function unattributed.
481//
482// In addition, all function decls are treated as __host__ __device__ when
483// ForceCUDAHostDeviceDepth > 0 (corresponding to code within a
484//   #pragma clang force_cuda_host_device_begin/end
485// pair).
486void Sema::maybeAddCUDAHostDeviceAttrs(FunctionDecl *NewD,
                                     const LookupResult &Previous) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 488, __extension__ __PRETTY_FUNCTION__));

if (ForceCUDAHostDeviceDepth > 0) {
  if (!NewD->hasAttr<CUDAHostAttr>())
    NewD->addAttr(CUDAHostAttr::CreateImplicit(Context));
  if (!NewD->hasAttr<CUDADeviceAttr>())
    NewD->addAttr(CUDADeviceAttr::CreateImplicit(Context));
  return;
}

if (!getLangOpts().CUDAHostDeviceConstexpr || !NewD->isConstexpr() ||
    NewD->isVariadic() || NewD->hasAttr<CUDAHostAttr>() ||
    NewD->hasAttr<CUDADeviceAttr>() || NewD->hasAttr<CUDAGlobalAttr>())
  return;

// Is D a __device__ function with the same signature as NewD, ignoring CUDA
// attributes?
auto IsMatchingDeviceFn = [&](NamedDecl *D) {
  if (UsingShadowDecl *Using = dyn_cast<UsingShadowDecl>(D))
    D = Using->getTargetDecl();
  FunctionDecl *OldD = D->getAsFunction();
  return OldD && OldD->hasAttr<CUDADeviceAttr>() &&
         !OldD->hasAttr<CUDAHostAttr>() &&
         !IsOverload(NewD, OldD, /* UseMemberUsingDeclRules = */ false,
                     /* ConsiderCudaAttrs = */ false);
};
auto It = llvm::find_if(Previous, IsMatchingDeviceFn);
if (It != Previous.end()) {
  // We found a __device__ function with the same name and signature as NewD
  // (ignoring CUDA attrs).  This is an error unless that function is defined
  // in a system header, in which case we simply return without making NewD
  // host+device.
  NamedDecl *Match = *It;
  if (!getSourceManager().isInSystemHeader(Match->getLocation())) {
    Diag(NewD->getLocation(),
         diag::err_cuda_unattributed_constexpr_cannot_overload_device)
        << NewD->getName();
    Diag(Match->getLocation(),
         diag::note_cuda_conflicting_device_function_declared_here);
  }
  return;
}

NewD->addAttr(CUDAHostAttr::CreateImplicit(Context));
NewD->addAttr(CUDADeviceAttr::CreateImplicit(Context));
533}

535// In CUDA, there are some constructs which may appear in semantically-valid
536// code, but trigger errors if we ever generate code for the function in which
537// they appear.  Essentially every construct you're not allowed to use on the
538// device falls into this category, because you are allowed to use these
539// constructs in a __host__ __device__ function, but only if that function is
540// never codegen'ed on the device.
541//
542// To handle semantic checking for these constructs, we keep track of the set of
543// functions we know will be emitted, either because we could tell a priori that
544// they would be emitted, or because they were transitively called by a
545// known-emitted function.
546//
547// We also keep a partial call graph of which not-known-emitted functions call
548// which other not-known-emitted functions.
549//
550// When we see something which is illegal if the current function is emitted
551// (usually by way of CUDADiagIfDeviceCode, CUDADiagIfHostCode, or
552// CheckCUDACall), we first check if the current function is known-emitted.  If
553// so, we immediately output the diagnostic.
554//
555// Otherwise, we "defer" the diagnostic.  It sits in Sema::CUDADeferredDiags
556// until we discover that the function is known-emitted, at which point we take
557// it out of this map and emit the diagnostic.

559Sema::CUDADiagBuilder::CUDADiagBuilder(Kind K, SourceLocation Loc,
                                     unsigned DiagID, FunctionDecl *Fn,
                                     Sema &S)
  : S(S), Loc(Loc), DiagID(DiagID), Fn(Fn),
    ShowCallStack(K == K_ImmediateWithCallStack || K == K_Deferred) {
switch (K) {
case K_Nop:
  break;
case K_Immediate:
case K_ImmediateWithCallStack:
  ImmediateDiag.emplace(S.Diag(Loc, DiagID));
  break;
case K_Deferred:
  assert(Fn && "Must have a function to attach the deferred diag to.")(static_cast <bool> (Fn && "Must have a function to attach the deferred diag to."
) ? void (0) : __assert_fail ("Fn && \"Must have a function to attach the deferred diag to.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 572, __extension__ __PRETTY_FUNCTION__));
  PartialDiag.emplace(S.PDiag(DiagID));
  break;
}
576}

578// Print notes showing how we can reach FD starting from an a priori
579// known-callable function.
580static void EmitCallStackNotes(Sema &S, FunctionDecl *FD) {
auto FnIt = S.CUDAKnownEmittedFns.find(FD);
while (FnIt != S.CUDAKnownEmittedFns.end()) {
  DiagnosticBuilder Builder(
      S.Diags.Report(FnIt->second.Loc, diag::note_called_by));
  Builder << FnIt->second.FD;
  Builder.setForceEmit();

  FnIt = S.CUDAKnownEmittedFns.find(FnIt->second.FD);
}
590}

592Sema::CUDADiagBuilder::~CUDADiagBuilder() {
if (ImmediateDiag) {
  // Emit our diagnostic and, if it was a warning or error, output a callstack
  // if Fn isn't a priori known-emitted.
  bool IsWarningOrError = S.getDiagnostics().getDiagnosticLevel(
                              DiagID, Loc) >= DiagnosticsEngine::Warning;
  ImmediateDiag.reset(); // Emit the immediate diag.
  if (IsWarningOrError && ShowCallStack)
    EmitCallStackNotes(S, Fn);
} else if (PartialDiag) {
  assert(ShowCallStack && "Must always show call stack for deferred diags.")(static_cast <bool> (ShowCallStack && "Must always show call stack for deferred diags."
) ? void (0) : __assert_fail ("ShowCallStack && \"Must always show call stack for deferred diags.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 602, __extension__ __PRETTY_FUNCTION__));
  S.CUDADeferredDiags[Fn].push_back({Loc, std::move(*PartialDiag)});
}
605}

607// Do we know that we will eventually codegen the given function?
608static bool IsKnownEmitted(Sema &S, FunctionDecl *FD) {
// Templates are emitted when they're instantiated.
if (FD->isDependentContext())
  return false;

// When compiling for device, host functions are never emitted.  Similarly,
// when compiling for host, device and global functions are never emitted.
// (Technically, we do emit a host-side stub for global functions, but this
// doesn't count for our purposes here.)
Sema::CUDAFunctionTarget T = S.IdentifyCUDATarget(FD);
if (S.getLangOpts().CUDAIsDevice && T == Sema::CFT_Host)
  return false;
if (!S.getLangOpts().CUDAIsDevice &&
    (T == Sema::CFT_Device || T == Sema::CFT_Global))
  return false;

// Check whether this function is externally visible -- if so, it's
// known-emitted.
//
// We have to check the GVA linkage of the function's *definition* -- if we
// only have a declaration, we don't know whether or not the function will be
// emitted, because (say) the definition could include "inline".
FunctionDecl *Def = FD->getDefinition();

if (Def &&
    !isDiscardableGVALinkage(S.getASTContext().GetGVALinkageForFunction(Def)))
  return true;

// Otherwise, the function is known-emitted if it's in our set of
// known-emitted functions.
return S.CUDAKnownEmittedFns.count(FD) > 0;
639}

641Sema::CUDADiagBuilder Sema::CUDADiagIfDeviceCode(SourceLocation Loc,
                                               unsigned DiagID) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 643, __extension__ __PRETTY_FUNCTION__));
CUDADiagBuilder::Kind DiagKind = [&] {
  switch (CurrentCUDATarget()) {
  case CFT_Global:
  case CFT_Device:
    return CUDADiagBuilder::K_Immediate;
  case CFT_HostDevice:
    // An HD function counts as host code if we're compiling for host, and
    // device code if we're compiling for device.  Defer any errors in device
    // mode until the function is known-emitted.
    if (getLangOpts().CUDAIsDevice) {
      return IsKnownEmitted(*this, dyn_cast<FunctionDecl>(CurContext))
                 ? CUDADiagBuilder::K_ImmediateWithCallStack
                 : CUDADiagBuilder::K_Deferred;
    }
    return CUDADiagBuilder::K_Nop;

  default:
    return CUDADiagBuilder::K_Nop;
  }
}();
return CUDADiagBuilder(DiagKind, Loc, DiagID,
                       dyn_cast<FunctionDecl>(CurContext), *this);
666}

668Sema::CUDADiagBuilder Sema::CUDADiagIfHostCode(SourceLocation Loc,
                                             unsigned DiagID) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 670, __extension__ __PRETTY_FUNCTION__));
CUDADiagBuilder::Kind DiagKind = [&] {
  switch (CurrentCUDATarget()) {
  case CFT_Host:
    return CUDADiagBuilder::K_Immediate;
  case CFT_HostDevice:
    // An HD function counts as host code if we're compiling for host, and
    // device code if we're compiling for device.  Defer any errors in device
    // mode until the function is known-emitted.
    if (getLangOpts().CUDAIsDevice)
      return CUDADiagBuilder::K_Nop;

    return IsKnownEmitted(*this, dyn_cast<FunctionDecl>(CurContext))
               ? CUDADiagBuilder::K_ImmediateWithCallStack
               : CUDADiagBuilder::K_Deferred;
  default:
    return CUDADiagBuilder::K_Nop;
  }
}();
return CUDADiagBuilder(DiagKind, Loc, DiagID,
                       dyn_cast<FunctionDecl>(CurContext), *this);
691}

693// Emit any deferred diagnostics for FD and erase them from the map in which
694// they're stored.
695static void EmitDeferredDiags(Sema &S, FunctionDecl *FD) {
auto It = S.CUDADeferredDiags.find(FD);
if (It == S.CUDADeferredDiags.end())
  return;
bool HasWarningOrError = false;
for (PartialDiagnosticAt &PDAt : It->second) {
  const SourceLocation &Loc = PDAt.first;
  const PartialDiagnostic &PD = PDAt.second;
  HasWarningOrError |= S.getDiagnostics().getDiagnosticLevel(
                           PD.getDiagID(), Loc) >= DiagnosticsEngine::Warning;
  DiagnosticBuilder Builder(S.Diags.Report(Loc, PD.getDiagID()));
  Builder.setForceEmit();
  PD.Emit(Builder);
}
S.CUDADeferredDiags.erase(It);

// FIXME: Should this be called after every warning/error emitted in the loop
// above, instead of just once per function?  That would be consistent with
// how we handle immediate errors, but it also seems like a bit much.
if (HasWarningOrError)
  EmitCallStackNotes(S, FD);
716}

718// Indicate that this function (and thus everything it transtively calls) will
719// be codegen'ed, and emit any deferred diagnostics on this function and its
720// (transitive) callees.
721static void MarkKnownEmitted(Sema &S, FunctionDecl *OrigCaller,
                           FunctionDecl *OrigCallee, SourceLocation OrigLoc) {
// Nothing to do if we already know that FD is emitted.
if (IsKnownEmitted(S, OrigCallee)) {
  assert(!S.CUDACallGraph.count(OrigCallee))(static_cast <bool> (!S.CUDACallGraph.count(OrigCallee)
) ? void (0) : __assert_fail ("!S.CUDACallGraph.count(OrigCallee)"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 725, __extension__ __PRETTY_FUNCTION__));
  return;
}

// We've just discovered that OrigCallee is known-emitted.  Walk our call
// graph to see what else we can now discover also must be emitted.

struct CallInfo {
  FunctionDecl *Caller;
  FunctionDecl *Callee;
  SourceLocation Loc;
};
llvm::SmallVector<CallInfo, 4> Worklist = {{OrigCaller, OrigCallee, OrigLoc}};
llvm::SmallSet<CanonicalDeclPtr<FunctionDecl>, 4> Seen;
Seen.insert(OrigCallee);
while (!Worklist.empty()) {
  CallInfo C = Worklist.pop_back_val();
  assert(!IsKnownEmitted(S, C.Callee) &&(static_cast <bool> (!IsKnownEmitted(S, C.Callee) &&
 "Worklist should not contain known-emitted functions.") ? void
 (0) : __assert_fail ("!IsKnownEmitted(S, C.Callee) && \"Worklist should not contain known-emitted functions.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 743, __extension__ __PRETTY_FUNCTION__))
         "Worklist should not contain known-emitted functions.")(static_cast <bool> (!IsKnownEmitted(S, C.Callee) &&
 "Worklist should not contain known-emitted functions.") ? void
 (0) : __assert_fail ("!IsKnownEmitted(S, C.Callee) && \"Worklist should not contain known-emitted functions.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 743, __extension__ __PRETTY_FUNCTION__));
  S.CUDAKnownEmittedFns[C.Callee] = {C.Caller, C.Loc};
  EmitDeferredDiags(S, C.Callee);

  // If this is a template instantiation, explore its callgraph as well:
  // Non-dependent calls are part of the template's callgraph, while dependent
  // calls are part of to the instantiation's call graph.
  if (auto *Templ = C.Callee->getPrimaryTemplate()) {
    FunctionDecl *TemplFD = Templ->getAsFunction();
    if (!Seen.count(TemplFD) && !S.CUDAKnownEmittedFns.count(TemplFD)) {
      Seen.insert(TemplFD);
      Worklist.push_back(
          {/* Caller = */ C.Caller, /* Callee = */ TemplFD, C.Loc});
    }
  }

  // Add all functions called by Callee to our worklist.
  auto CGIt = S.CUDACallGraph.find(C.Callee);
  if (CGIt == S.CUDACallGraph.end())
    continue;

  for (std::pair<CanonicalDeclPtr<FunctionDecl>, SourceLocation> FDLoc :
       CGIt->second) {
    FunctionDecl *NewCallee = FDLoc.first;
    SourceLocation CallLoc = FDLoc.second;
    if (Seen.count(NewCallee) || IsKnownEmitted(S, NewCallee))
      continue;
    Seen.insert(NewCallee);
    Worklist.push_back(
        {/* Caller = */ C.Callee, /* Callee = */ NewCallee, CallLoc});
  }

  // C.Callee is now known-emitted, so we no longer need to maintain its list
  // of callees in CUDACallGraph.
  S.CUDACallGraph.erase(CGIt);
}
779}

781bool Sema::CheckCUDACall(SourceLocation Loc, FunctionDecl *Callee) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 782, __extension__ __PRETTY_FUNCTION__));
assert(Callee && "Callee may not be null.")(static_cast <bool> (Callee && "Callee may not be null."
) ? void (0) : __assert_fail ("Callee && \"Callee may not be null.\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 783, __extension__ __PRETTY_FUNCTION__));
// FIXME: Is bailing out early correct here?  Should we instead assume that
// the caller is a global initializer?
FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext);
if (!Caller)
1
Assuming 'Caller' is non-null→
2
←
Taking false branch→
  return true;

// If the caller is known-emitted, mark the callee as known-emitted.
// Otherwise, mark the call in our call graph so we can traverse it later.
bool CallerKnownEmitted = IsKnownEmitted(*this, Caller);
if (CallerKnownEmitted)
3
←
Taking false branch→
  MarkKnownEmitted(*this, Caller, Callee, Loc);
else {
  // If we have
  //   host fn calls kernel fn calls host+device,
  // the HD function does not get instantiated on the host.  We model this by
  // omitting at the call to the kernel from the callgraph.  This ensures
  // that, when compiling for host, only HD functions actually called from the
  // host get marked as known-emitted.
  if (getLangOpts().CUDAIsDevice || IdentifyCUDATarget(Callee) != CFT_Global)
4
←
Assuming the condition is false→
5
←
Assuming the condition is false→
6
←
Taking false branch→
    CUDACallGraph[Caller].insert({Callee, Loc});
}

CUDADiagBuilder::Kind DiagKind = [&] {
  switch (IdentifyCUDAPreference(Caller, Callee)) {
  case CFP_Never:
    return CUDADiagBuilder::K_Immediate;
  case CFP_WrongSide:
    assert(Caller && "WrongSide calls require a non-null caller")(static_cast <bool> (Caller && "WrongSide calls require a non-null caller"
) ? void (0) : __assert_fail ("Caller && \"WrongSide calls require a non-null caller\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 811, __extension__ __PRETTY_FUNCTION__));
    // If we know the caller will be emitted, we know this wrong-side call
    // will be emitted, so it's an immediate error.  Otherwise, defer the
    // error until we know the caller is emitted.
    return CallerKnownEmitted ? CUDADiagBuilder::K_ImmediateWithCallStack
                              : CUDADiagBuilder::K_Deferred;
  default:
    return CUDADiagBuilder::K_Nop;
  }
}();

if (DiagKind == CUDADiagBuilder::K_Nop)
7
←
Taking false branch→
  return true;

// Avoid emitting this error twice for the same location.  Using a hashtable
// like this is unfortunate, but because we must continue parsing as normal
// after encountering a deferred error, it's otherwise very tricky for us to
// ensure that we only emit this deferred error once.
if (!LocsWithCUDACallDiags.insert({Caller, Loc}).second)
8
←
Assuming the condition is false→
9
←
Taking false branch→
  return true;

CUDADiagBuilder(DiagKind, Loc, diag::err_ref_bad_target, Caller, *this)
    << IdentifyCUDATarget(Callee) << Callee << IdentifyCUDATarget(Caller);
CUDADiagBuilder(DiagKind, Callee->getLocation(), diag::note_previous_decl,
10
←
Calling 'operator<<'→
27
←
Returned allocated memory→
                Caller, *this)
    << Callee;
return DiagKind != CUDADiagBuilder::K_Immediate &&
28
←
Potential leak of memory pointed to by field 'DiagStorage'
       DiagKind != CUDADiagBuilder::K_ImmediateWithCallStack;
839}

841void Sema::CUDASetLambdaAttrs(CXXMethodDecl *Method) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 842, __extension__ __PRETTY_FUNCTION__));
if (Method->hasAttr<CUDAHostAttr>() || Method->hasAttr<CUDADeviceAttr>())
  return;
FunctionDecl *CurFn = dyn_cast<FunctionDecl>(CurContext);
if (!CurFn)
  return;
CUDAFunctionTarget Target = IdentifyCUDATarget(CurFn);
if (Target == CFT_Global || Target == CFT_Device) {
  Method->addAttr(CUDADeviceAttr::CreateImplicit(Context));
} else if (Target == CFT_HostDevice) {
  Method->addAttr(CUDADeviceAttr::CreateImplicit(Context));
  Method->addAttr(CUDAHostAttr::CreateImplicit(Context));
}
855}

857void Sema::checkCUDATargetOverload(FunctionDecl *NewFD,
                                 const LookupResult &Previous) {
assert(getLangOpts().CUDA && "Should only be called during CUDA compilation")(static_cast <bool> (getLangOpts().CUDA && "Should only be called during CUDA compilation"
) ? void (0) : __assert_fail ("getLangOpts().CUDA && \"Should only be called during CUDA compilation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/lib/Sema/SemaCUDA.cpp"
, 859, __extension__ __PRETTY_FUNCTION__));
CUDAFunctionTarget NewTarget = IdentifyCUDATarget(NewFD);
for (NamedDecl *OldND : Previous) {
  FunctionDecl *OldFD = OldND->getAsFunction();
  if (!OldFD)
    continue;

  CUDAFunctionTarget OldTarget = IdentifyCUDATarget(OldFD);
  // Don't allow HD and global functions to overload other functions with the
  // same signature.  We allow overloading based on CUDA attributes so that
  // functions can have different implementations on the host and device, but
  // HD/global functions "exist" in some sense on both the host and device, so
  // should have the same implementation on both sides.
  if (NewTarget != OldTarget &&
      ((NewTarget == CFT_HostDevice) || (OldTarget == CFT_HostDevice) ||
       (NewTarget == CFT_Global) || (OldTarget == CFT_Global)) &&
      !IsOverload(NewFD, OldFD, /* UseMemberUsingDeclRules = */ false,
                  /* ConsiderCudaAttrs = */ false)) {
    Diag(NewFD->getLocation(), diag::err_cuda_ovl_target)
        << NewTarget << NewFD->getDeclName() << OldTarget << OldFD;
    Diag(OldFD->getLocation(), diag::note_previous_declaration);
    NewFD->setInvalidDecl();
    break;
  }
}
884}

886template <typename AttrTy>
887static void copyAttrIfPresent(Sema &S, FunctionDecl *FD,
                            const FunctionDecl &TemplateFD) {
if (AttrTy *Attribute = TemplateFD.getAttr<AttrTy>()) {
  AttrTy *Clone = Attribute->clone(S.Context);
  Clone->setInherited(true);
  FD->addAttr(Clone);
}
894}

896void Sema::inheritCUDATargetAttrs(FunctionDecl *FD,
                                const FunctionTemplateDecl &TD) {
const FunctionDecl &TemplateFD = *TD.getTemplatedDecl();
copyAttrIfPresent<CUDAGlobalAttr>(*this, FD, TemplateFD);
copyAttrIfPresent<CUDAHostAttr>(*this, FD, TemplateFD);
copyAttrIfPresent<CUDADeviceAttr>(*this, FD, TemplateFD);
902}

←

/build/llvm-toolchain-snapshot-7~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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~svn326425/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,
                             bool Diagnose = true);
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);

ParsedTemplateArgument ActOnTemplateTypeArgument(TypeResult ParsedType);

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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7170, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7461, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7461, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7583, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7583, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7588, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7588, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7619, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7619, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 7639, __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.
//
8520private:
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;
8526public:
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.
//
8572private:
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());

8610public:
/// \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);

9874private:
unsigned ForceCUDAHostDeviceDepth = 0;

9877public:
/// 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())
11
←
Assuming the condition is false→
12
←
Taking false branch→
      *Diag.ImmediateDiag << Value;
    else if (Diag.PartialDiag.hasValue())
13
←
Assuming the condition is true→
14
←
Taking true branch→
      *Diag.PartialDiag << Value;
15
←
Calling 'operator<<'→
26
←
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);

10082public:
/// 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

10303public:
SourceLocation getLocationOfStringLiteralByte(const StringLiteral *SL,
                                              unsigned ByteNo) const;

10307private:
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);

10365public:
// Used by C++ template instantiation.
ExprResult SemaBuiltinShuffleVector(CallExpr *TheCall);
ExprResult SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
                                 SourceLocation BuiltinLoc,
                                 SourceLocation RParenLoc);

10372private:
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);
10392public:
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);

10411private:
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);

10446public:
void CheckFloatComparison(SourceLocation Loc, Expr *LHS, Expr *RHS);

10449private:
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);
10479public:
/// \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;

10505private:
/// \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;

10541protected:
friend class Parser;
friend class InitializationSequence;
friend class ASTReader;
friend class ASTDeclReader;
friend class ASTWriter;

10548public:
/// 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;

10603private:
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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10610, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10610, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10613, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10613, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10613, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10615, __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~svn326425/tools/clang/include/clang/Sema/Sema.h"
, 10615, __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);

10659public:
/// \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);
10679};

10681/// \brief RAII object that enters a new expression evaluation context.
10682class EnterExpressionEvaluationContext {
Sema &Actions;
bool Entered = true;

10686public:

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();
}
10728};

10730DeductionFailureInfo
10731MakeDeductionFailureInfo(ASTContext &Context, Sema::TemplateDeductionResult TDK,
                       sema::TemplateDeductionInfo &Info);

10734/// \brief Contains a late templated function.
10735/// Will be parsed at the end of the translation unit, used by Sema & Parser.
10736struct LateParsedTemplate {
CachedTokens Toks;
/// \brief The template function declaration to be late parsed.
Decl *D;
10740};

10742} // end namespace clang

10744namespace llvm {
10745// Hash a FunctionDeclAndLoc by looking at both its FunctionDecl and its
10746// SourceLocation.
10747template <> 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;
}
10768};
10769} // namespace llvm

10771#endif

←

/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h

→

1//===- Decl.h - Classes for representing declarations -----------*- 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 Decl subclasses.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_CLANG_AST_DECL_H
15#define LLVM_CLANG_AST_DECL_H

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

51namespace clang {

53class ASTContext;
54struct ASTTemplateArgumentListInfo;
55class Attr;
56class CompoundStmt;
57class DependentFunctionTemplateSpecializationInfo;
58class EnumDecl;
59class Expr;
60class FunctionTemplateDecl;
61class FunctionTemplateSpecializationInfo;
62class LabelStmt;
63class MemberSpecializationInfo;
64class Module;
65class NamespaceDecl;
66class ParmVarDecl;
67class RecordDecl;
68class Stmt;
69class StringLiteral;
70class TagDecl;
71class TemplateArgumentList;
72class TemplateArgumentListInfo;
73class TemplateParameterList;
74class TypeAliasTemplateDecl;
75class TypeLoc;
76class UnresolvedSetImpl;
77class VarTemplateDecl;

79/// A container of type source information.
80///
81/// A client can read the relevant info using TypeLoc wrappers, e.g:
82/// @code
83/// TypeLoc TL = TypeSourceInfo->getTypeLoc();
84/// TL.getStartLoc().print(OS, SrcMgr);
85/// @endcode
86class LLVM_ALIGNAS(8)alignas(8) TypeSourceInfo {
// Contains a memory block after the class, used for type source information,
// allocated by ASTContext.
friend class ASTContext;

QualType Ty;

TypeSourceInfo(QualType ty) : Ty(ty) {}

95public:
/// Return the type wrapped by this type source info.
QualType getType() const { return Ty; }

/// Return the TypeLoc wrapper for the type source info.
TypeLoc getTypeLoc() const; // implemented in TypeLoc.h

/// Override the type stored in this TypeSourceInfo. Use with caution!
void overrideType(QualType T) { Ty = T; }
104};

106/// The top declaration context.
107class TranslationUnitDecl : public Decl, public DeclContext {
ASTContext &Ctx;

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

explicit TranslationUnitDecl(ASTContext &ctx);

virtual void anchor();

118public:
ASTContext &getASTContext() const { return Ctx; }

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

static TranslationUnitDecl *Create(ASTContext &C);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TranslationUnit; }
static DeclContext *castToDeclContext(const TranslationUnitDecl *D) {
  return static_cast<DeclContext *>(const_cast<TranslationUnitDecl*>(D));
}
static TranslationUnitDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<TranslationUnitDecl *>(const_cast<DeclContext*>(DC));
}
135};

137/// Represents a `#pragma comment` line. Always a child of
138/// TranslationUnitDecl.
139class PragmaCommentDecl final
  : public Decl,
    private llvm::TrailingObjects<PragmaCommentDecl, char> {
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

PragmaMSCommentKind CommentKind;

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

virtual void anchor();

154public:
static PragmaCommentDecl *Create(const ASTContext &C, TranslationUnitDecl *DC,
                                 SourceLocation CommentLoc,
                                 PragmaMSCommentKind CommentKind,
                                 StringRef Arg);
static PragmaCommentDecl *CreateDeserialized(ASTContext &C, unsigned ID,
                                             unsigned ArgSize);

PragmaMSCommentKind getCommentKind() const { return CommentKind; }

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == PragmaComment; }
169};

171/// Represents a `#pragma detect_mismatch` line. Always a child of
172/// TranslationUnitDecl.
173class PragmaDetectMismatchDecl final
  : public Decl,
    private llvm::TrailingObjects<PragmaDetectMismatchDecl, char> {
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

size_t ValueStart;

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

virtual void anchor();

188public:
static PragmaDetectMismatchDecl *Create(const ASTContext &C,
                                        TranslationUnitDecl *DC,
                                        SourceLocation Loc, StringRef Name,
                                        StringRef Value);
static PragmaDetectMismatchDecl *
CreateDeserialized(ASTContext &C, unsigned ID, unsigned NameValueSize);

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == PragmaDetectMismatch; }
202};

204/// Declaration context for names declared as extern "C" in C++. This
205/// is neither the semantic nor lexical context for such declarations, but is
206/// used to check for conflicts with other extern "C" declarations. Example:
207///
208/// \code
209///   namespace N { extern "C" void f(); } // #1
210///   void N::f() {}                       // #2
211///   namespace M { extern "C" void f(); } // #3
212/// \endcode
213///
214/// The semantic context of #1 is namespace N and its lexical context is the
215/// LinkageSpecDecl; the semantic context of #2 is namespace N and its lexical
216/// context is the TU. However, both declarations are also visible in the
217/// extern "C" context.
218///
219/// The declaration at #3 finds it is a redeclaration of \c N::f through
220/// lookup in the extern "C" context.
221class ExternCContextDecl : public Decl, public DeclContext {
explicit ExternCContextDecl(TranslationUnitDecl *TU)
  : Decl(ExternCContext, TU, SourceLocation()),
    DeclContext(ExternCContext) {}

virtual void anchor();

228public:
static ExternCContextDecl *Create(const ASTContext &C,
                                  TranslationUnitDecl *TU);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ExternCContext; }
static DeclContext *castToDeclContext(const ExternCContextDecl *D) {
  return static_cast<DeclContext *>(const_cast<ExternCContextDecl*>(D));
}
static ExternCContextDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<ExternCContextDecl *>(const_cast<DeclContext*>(DC));
}
241};

243/// This represents a decl that may have a name.  Many decls have names such
244/// as ObjCMethodDecl, but not \@class, etc.
245///
246/// Note that not every NamedDecl is actually named (e.g., a struct might
247/// be anonymous), and not every name is an identifier.
248class NamedDecl : public Decl {
/// The name of this declaration, which is typically a normal
/// identifier but may also be a special kind of name (C++
/// constructor, Objective-C selector, etc.)
DeclarationName Name;

virtual void anchor();

256private:
NamedDecl *getUnderlyingDeclImpl() LLVM_READONLY__attribute__((__pure__));

259protected:
NamedDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N)
    : Decl(DK, DC, L), Name(N) {}

263public:
/// Get the identifier that names this declaration, if there is one.
///
/// This will return NULL if this declaration has no name (e.g., for
/// an unnamed class) or if the name is a special name (C++ constructor,
/// Objective-C selector, etc.).
IdentifierInfo *getIdentifier() const { return Name.getAsIdentifierInfo(); }

/// Get the name of identifier for this declaration as a StringRef.
///
/// This requires that the declaration have a name and that it be a simple
/// identifier.
StringRef getName() const {
  assert(Name.isIdentifier() && "Name is not a simple identifier")(static_cast <bool> (Name.isIdentifier() && "Name is not a simple identifier"
) ? void (0) : __assert_fail ("Name.isIdentifier() && \"Name is not a simple identifier\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 276, __extension__ __PRETTY_FUNCTION__));
  return getIdentifier() ? getIdentifier()->getName() : "";
}

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

virtual void printName(raw_ostream &os) const;

/// Get the actual, stored name of the declaration, which may be a special
/// name.
DeclarationName getDeclName() const { return Name; }

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

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

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

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

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

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

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

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

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

  return DC->isRecord();
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

ObjCStringFormatFamily getObjCFStringFormattingFamily() const;

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstNamed && K <= lastNamed; }
456};

458inline raw_ostream &operator<<(raw_ostream &OS, const NamedDecl &ND) {
ND.printName(OS);
return OS;
461}

463/// Represents the declaration of a label.  Labels also have a
464/// corresponding LabelStmt, which indicates the position that the label was
465/// defined at.  For normal labels, the location of the decl is the same as the
466/// location of the statement.  For GNU local labels (__label__), the decl
467/// location is where the __label__ is.
468class LabelDecl : public NamedDecl {
LabelStmt *TheStmt;
StringRef MSAsmName;
bool MSAsmNameResolved = false;

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

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

void anchor() override;

484public:
static LabelDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation IdentL, IdentifierInfo *II);
static LabelDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation IdentL, IdentifierInfo *II,
                         SourceLocation GnuLabelL);
static LabelDecl *CreateDeserialized(ASTContext &C, unsigned ID);

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

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

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

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Label; }
511};

513/// Represent a C++ namespace.
514class NamespaceDecl : public NamedDecl, public DeclContext, 
                    public Redeclarable<NamespaceDecl> 
516{
/// The starting location of the source range, pointing
/// to either the namespace or the inline keyword.
SourceLocation LocStart;

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

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

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

using redeclarable_base = Redeclarable<NamespaceDecl>;

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

540public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Namespace; }
static DeclContext *castToDeclContext(const NamespaceDecl *D) {
  return static_cast<DeclContext *>(const_cast<NamespaceDecl*>(D));
}
static NamespaceDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<NamespaceDecl *>(const_cast<DeclContext*>(DC));
}
631};

633/// Represent the declaration of a variable (in which case it is
634/// an lvalue) a function (in which case it is a function designator) or
635/// an enum constant.
636class ValueDecl : public NamedDecl {
QualType DeclType;

void anchor() override;

641protected:
ValueDecl(Kind DK, DeclContext *DC, SourceLocation L,
          DeclarationName N, QualType T)
  : NamedDecl(DK, DC, L, N), DeclType(T) {}

646public:
QualType getType() const { return DeclType; }
void setType(QualType newType) { DeclType = newType; }

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstValue && K <= lastValue; }
657};

659/// A struct with extended info about a syntactic
660/// name qualifier, to be used for the case of out-of-line declarations.
661struct QualifierInfo {
NestedNameSpecifierLoc QualifierLoc;

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

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

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

/// Sets info about "outer" template parameter lists.
void setTemplateParameterListsInfo(ASTContext &Context,
                                   ArrayRef<TemplateParameterList *> TPLists);
684};

686/// Represents a ValueDecl that came out of a declarator.
687/// Contains type source information through TypeSourceInfo.
688class DeclaratorDecl : public ValueDecl {
// A struct representing both a TInfo and a syntactic qualifier,
// to be used for the (uncommon) case of out-of-line declarations.
struct ExtInfo : public QualifierInfo {
  TypeSourceInfo *TInfo;
};

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

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

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

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

711public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

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

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

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

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

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

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

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

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

void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc);

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

TemplateParameterList *getTemplateParameterList(unsigned index) const {
  assert(index < getNumTemplateParameterLists())(static_cast <bool> (index < getNumTemplateParameterLists
()) ? void (0) : __assert_fail ("index < getNumTemplateParameterLists()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 764, __extension__ __PRETTY_FUNCTION__));
  return getExtInfo()->TemplParamLists[index];
}

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

SourceLocation getTypeSpecStartLoc() const;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstDeclarator && K <= lastDeclarator;
}
778};

780/// Structure used to store a statement, the constant value to
781/// which it was evaluated (if any), and whether or not the statement
782/// is an integral constant expression (if known).
783struct EvaluatedStmt {
/// Whether this statement was already evaluated.
bool WasEvaluated : 1;

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

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

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

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

Stmt *Value;
APValue Evaluated;

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

809};

811/// Represents a variable declaration or definition.
812class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> {
813public:
/// Initialization styles.
enum InitializationStyle {
  /// C-style initialization with assignment
  CInit,

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

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

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

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

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

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

843protected:
// A pointer union of Stmt * and EvaluatedStmt *. When an EvaluatedStmt, we
// have allocated the auxiliary struct of information there.
//
// TODO: It is a bit unfortunate to use a PointerUnion inside the VarDecl for
// this as *many* VarDecls are ParmVarDecls that don't have default
// arguments. We could save some space by moving this pointer union to be
// allocated in trailing space when necessary.
using InitType = llvm::PointerUnion<Stmt *, EvaluatedStmt *>;

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

857private:
friend class ASTDeclReader;
friend class ASTNodeImporter;
friend class StmtIteratorBase;

class VarDeclBitfields {
  friend class ASTDeclReader;
  friend class VarDecl;

  unsigned SClass : 3;
  unsigned TSCSpec : 2;
  unsigned InitStyle : 2;
};
enum { NumVarDeclBits = 7 };

872protected:
enum { NumParameterIndexBits = 8 };

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

class ParmVarDeclBitfields {
  friend class ASTDeclReader;
  friend class ParmVarDecl;

  unsigned : NumVarDeclBits;

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

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

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

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

  /// If IsObjCMethodParam, a Decl::ObjCDeclQualifier.
  /// Otherwise, the number of function parameter scopes enclosing
  /// the function parameter scope in which this parameter was
  /// declared.
  unsigned ScopeDepthOrObjCQuals : 7;

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

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

  unsigned : NumVarDeclBits;

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

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

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

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

  /// Whether this variable is an ARC pseudo-__strong
  /// variable;  see isARCPseudoStrong() for details.
  unsigned ARCPseudoStrong : 1;

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

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

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

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

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

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

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

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

using redeclarable_base = Redeclarable<VarDecl>;

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

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

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

992public:
using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

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

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

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

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

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

void setTSCSpec(ThreadStorageClassSpecifier TSC) {
  VarDeclBits.TSCSpec = TSC;
  assert(VarDeclBits.TSCSpec == TSC && "truncation")(static_cast <bool> (VarDeclBits.TSCSpec == TSC &&
 "truncation") ? void (0) : __assert_fail ("VarDeclBits.TSCSpec == TSC && \"truncation\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1021, __extension__ __PRETTY_FUNCTION__));
}
ThreadStorageClassSpecifier getTSCSpec() const {
  return static_cast<ThreadStorageClassSpecifier>(VarDeclBits.TSCSpec);
}
TLSKind getTLSKind() const;

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

  // Global Named Register (GNU extension)
  if (getStorageClass() == SC_Register && !isLocalVarDeclOrParm())
    return false;

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

  return getStorageClass() >= SC_Auto;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  if (isStaticDataMember())
    return true;

  return false;
}

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

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

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

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

void setInit(Expr *I);

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

EvaluatedStmt *ensureEvaluatedStmt() const;

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

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

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

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

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

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

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

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

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

/// \brief This is a definition which should be demoted to a declaration.
///
/// In some cases (mostly module merging) we can end up with two visible
/// definitions one of which needs to be demoted to a declaration to keep
/// the AST invariants.
void demoteThisDefinitionToDeclaration() {
  assert(isThisDeclarationADefinition() && "Not a definition!")(static_cast <bool> (isThisDeclarationADefinition() &&
 "Not a definition!") ? void (0) : __assert_fail ("isThisDeclarationADefinition() && \"Not a definition!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1294, __extension__ __PRETTY_FUNCTION__));
  assert(!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!")(static_cast <bool> (!isa<ParmVarDecl>(this) &&
 "Cannot demote ParmVarDecls!") ? void (0) : __assert_fail ("!isa<ParmVarDecl>(this) && \"Cannot demote ParmVarDecls!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1295, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = 1;
}

/// \brief Determine whether this variable is the exception variable in a
/// C++ catch statememt or an Objective-C \@catch statement.
bool isExceptionVariable() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ExceptionVar;
}
void setExceptionVariable(bool EV) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1305, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.ExceptionVar = EV;
}

/// \brief Determine whether this local variable can be used with the named
/// return value optimization (NRVO).
///
/// The named return value optimization (NRVO) works by marking certain
/// non-volatile local variables of class type as NRVO objects. These
/// locals can be allocated within the return slot of their containing
/// function, in which case there is no need to copy the object to the
/// return slot when returning from the function. Within the function body,
/// each return that returns the NRVO object will have this variable as its
/// NRVO candidate.
bool isNRVOVariable() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.NRVOVariable;
}
void setNRVOVariable(bool NRVO) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1323, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.NRVOVariable = NRVO;
}

/// \brief Determine whether this variable is the for-range-declaration in
/// a C++0x for-range statement.
bool isCXXForRangeDecl() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.CXXForRangeDecl;
}
void setCXXForRangeDecl(bool FRD) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1333, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.CXXForRangeDecl = FRD;
}

/// \brief Determine whether this variable is an ARC pseudo-__strong
/// variable.  A pseudo-__strong variable has a __strong-qualified
/// type but does not actually retain the object written into it.
/// Generally such variables are also 'const' for safety.
bool isARCPseudoStrong() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ARCPseudoStrong;
}
void setARCPseudoStrong(bool ps) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1345, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.ARCPseudoStrong = ps;
}

/// Whether this variable is (C++1z) inline.
bool isInline() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInline;
}
bool isInlineSpecified() const {
  return isa<ParmVarDecl>(this) ? false
                                : NonParmVarDeclBits.IsInlineSpecified;
}
void setInlineSpecified() {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1358, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInline = true;
  NonParmVarDeclBits.IsInlineSpecified = true;
}
void setImplicitlyInline() {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1363, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInline = true;
}

/// Whether this variable is (C++11) constexpr.
bool isConstexpr() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsConstexpr;
}
void setConstexpr(bool IC) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1372, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsConstexpr = IC;
}

/// Whether this variable is the implicit variable for a lambda init-capture.
bool isInitCapture() const {
  return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInitCapture;
}
void setInitCapture(bool IC) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1381, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.IsInitCapture = IC;
}

/// Whether this local extern variable declaration's previous declaration
/// was declared in the same block scope. Only correct in C++.
bool isPreviousDeclInSameBlockScope() const {
  return isa<ParmVarDecl>(this)
             ? false
             : NonParmVarDeclBits.PreviousDeclInSameBlockScope;
}
void setPreviousDeclInSameBlockScope(bool Same) {
  assert(!isa<ParmVarDecl>(this))(static_cast <bool> (!isa<ParmVarDecl>(this)) ? void
 (0) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1393, __extension__ __PRETTY_FUNCTION__));
  NonParmVarDeclBits.PreviousDeclInSameBlockScope = Same;
}

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

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

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

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

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

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

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

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

void setDescribedVarTemplate(VarTemplateDecl *Template);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstVar && K <= lastVar; }
1449};

1451class ImplicitParamDecl : public VarDecl {
void anchor() override;

1454public:
/// Defines the kind of the implicit parameter: is this an implicit parameter
/// with pointer to 'this', 'self', '_cmd', virtual table pointers, captured
/// context or something else.
enum ImplicitParamKind : unsigned {
  /// Parameter for Objective-C 'self' argument
  ObjCSelf,

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

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

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

  /// Parameter for captured context
  CapturedContext,

  /// Other implicit parameter
  Other,
};

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

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

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

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

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ImplicitParam; }
1512};

1514/// Represents a parameter to a function.
1515class ParmVarDecl : public VarDecl {
1516public:
enum { MaxFunctionScopeDepth = 255 };
enum { MaxFunctionScopeIndex = 255 };

1520protected:
ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
            SourceLocation IdLoc, IdentifierInfo *Id, QualType T,
            TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
    : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) {
  assert(ParmVarDeclBits.HasInheritedDefaultArg == false)(static_cast <bool> (ParmVarDeclBits.HasInheritedDefaultArg
 == false) ? void (0) : __assert_fail ("ParmVarDeclBits.HasInheritedDefaultArg == false"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1525, __extension__ __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.DefaultArgKind == DAK_None)(static_cast <bool> (ParmVarDeclBits.DefaultArgKind == DAK_None
) ? void (0) : __assert_fail ("ParmVarDeclBits.DefaultArgKind == DAK_None"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1526, __extension__ __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.IsKNRPromoted == false)(static_cast <bool> (ParmVarDeclBits.IsKNRPromoted == false
) ? void (0) : __assert_fail ("ParmVarDeclBits.IsKNRPromoted == false"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1527, __extension__ __PRETTY_FUNCTION__));
  assert(ParmVarDeclBits.IsObjCMethodParam == false)(static_cast <bool> (ParmVarDeclBits.IsObjCMethodParam ==
 false) ? void (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam == false"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1528, __extension__ __PRETTY_FUNCTION__));
  setDefaultArg(DefArg);
}

1532public:
static ParmVarDecl *Create(ASTContext &C, DeclContext *DC,
                           SourceLocation StartLoc,
                           SourceLocation IdLoc, IdentifierInfo *Id,
                           QualType T, TypeSourceInfo *TInfo,
                           StorageClass S, Expr *DefArg);

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

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

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

void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) {
  assert(!ParmVarDeclBits.IsObjCMethodParam)(static_cast <bool> (!ParmVarDeclBits.IsObjCMethodParam
) ? void (0) : __assert_fail ("!ParmVarDeclBits.IsObjCMethodParam"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1549, __extension__ __PRETTY_FUNCTION__));

  ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth;
  assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth(static_cast <bool> (ParmVarDeclBits.ScopeDepthOrObjCQuals
 == scopeDepth && "truncation!") ? void (0) : __assert_fail
 ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1553, __extension__ __PRETTY_FUNCTION__))
         && "truncation!")(static_cast <bool> (ParmVarDeclBits.ScopeDepthOrObjCQuals
 == scopeDepth && "truncation!") ? void (0) : __assert_fail
 ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1553, __extension__ __PRETTY_FUNCTION__));

  setParameterIndex(parameterIndex);
}

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

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

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

ObjCDeclQualifier getObjCDeclQualifier() const {
  if (!ParmVarDeclBits.IsObjCMethodParam) return OBJC_TQ_None;
  return ObjCDeclQualifier(ParmVarDeclBits.ScopeDepthOrObjCQuals);
}
void setObjCDeclQualifier(ObjCDeclQualifier QTVal) {
  assert(ParmVarDeclBits.IsObjCMethodParam)(static_cast <bool> (ParmVarDeclBits.IsObjCMethodParam)
 ? void (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1577, __extension__ __PRETTY_FUNCTION__));
  ParmVarDeclBits.ScopeDepthOrObjCQuals = QTVal;
}

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

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

void setDefaultArg(Expr *defarg);

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

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

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

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

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

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

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

QualType getOriginalType() const;

/// \brief Determine whether this parameter is actually a function
/// parameter pack.
bool isParameterPack() const;

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

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

1665private:
enum { ParameterIndexSentinel = (1 << NumParameterIndexBits) - 1 };

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

  ParmVarDeclBits.ParameterIndex = parameterIndex;
  assert(ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!")(static_cast <bool> (ParmVarDeclBits.ParameterIndex == parameterIndex
 && "truncation!") ? void (0) : __assert_fail ("ParmVarDeclBits.ParameterIndex == parameterIndex && \"truncation!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 1675, __extension__ __PRETTY_FUNCTION__));
}
unsigned getParameterIndex() const {
  unsigned d = ParmVarDeclBits.ParameterIndex;
  return d == ParameterIndexSentinel ? getParameterIndexLarge() : d;
}

void setParameterIndexLarge(unsigned parameterIndex);
unsigned getParameterIndexLarge() const;
1684};

1686/// Represents a function declaration or definition.
1687///
1688/// Since a given function can be declared several times in a program,
1689/// there may be several FunctionDecls that correspond to that
1690/// function. Only one of those FunctionDecls will be found when
1691/// traversing the list of declarations in the context of the
1692/// FunctionDecl (e.g., the translation unit); this FunctionDecl
1693/// contains all of the information known about the function. Other,
1694/// previous declarations of the function are available via the
1695/// getPreviousDecl() chain.
1696class FunctionDecl : public DeclaratorDecl, public DeclContext,
                   public Redeclarable<FunctionDecl> {
1698public:
/// \brief The kind of templated function a FunctionDecl can be.
enum TemplatedKind {
  TK_NonTemplate,
  TK_FunctionTemplate,
  TK_MemberSpecialization,
  TK_FunctionTemplateSpecialization,
  TK_DependentFunctionTemplateSpecialization
};

1708private:
/// A new[]'d array of pointers to VarDecls for the formal
/// parameters of this function.  This is null if a prototype or if there are
/// no formals.
ParmVarDecl **ParamInfo = nullptr;

LazyDeclStmtPtr Body;

// FIXME: This can be packed into the bitfields in DeclContext.
// NOTE: VC++ packs bitfields poorly if the types differ.
unsigned SClass : 3;
unsigned IsInline : 1;
unsigned IsInlineSpecified : 1;

1722protected:
// This is shared by CXXConstructorDecl, CXXConversionDecl, and
// CXXDeductionGuideDecl.
unsigned IsExplicitSpecified : 1;

1727private:
unsigned IsVirtualAsWritten : 1;
unsigned IsPure : 1;
unsigned HasInheritedPrototype : 1;
unsigned HasWrittenPrototype : 1;
unsigned IsDeleted : 1;
unsigned IsTrivial : 1; // sunk from CXXMethodDecl

/// This flag indicates whether this function is trivial for the purpose of
/// calls. This is meaningful only when this function is a copy/move
/// constructor or a destructor.
unsigned IsTrivialForCall : 1;

unsigned IsDefaulted : 1; // sunk from CXXMethoDecl
unsigned IsExplicitlyDefaulted : 1; //sunk from CXXMethodDecl
unsigned HasImplicitReturnZero : 1;
unsigned IsLateTemplateParsed : 1;
unsigned IsConstexpr : 1;
unsigned InstantiationIsPending : 1;

/// \brief Indicates if the function uses __try.
unsigned UsesSEHTry : 1;

/// \brief Indicates if the function was a definition but its body was
/// skipped.
unsigned HasSkippedBody : 1;

/// Indicates if the function declaration will have a body, once we're done
/// parsing it.
unsigned WillHaveBody : 1;

/// Indicates that this function is a multiversioned function using attribute
/// 'target'.
unsigned IsMultiVersion : 1;

1762protected:
/// [C++17] Only used by CXXDeductionGuideDecl. Declared here to avoid
/// increasing the size of CXXDeductionGuideDecl by the size of an unsigned
/// int as opposed to adding a single bit to FunctionDecl.
/// Indicates that the Deduction Guide is the implicitly generated 'copy
/// deduction candidate' (is used during overload resolution).
unsigned IsCopyDeductionCandidate : 1;

1770private:

/// Store the ODRHash after first calculation.
unsigned HasODRHash : 1;
unsigned ODRHash;

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

/// \brief The template or declaration that this declaration
/// describes or was instantiated from, respectively.
///
/// For non-templates, this value will be NULL. For function
/// declarations that describe a function template, this will be a
/// pointer to a FunctionTemplateDecl. For member functions
/// of class template specializations, this will be a MemberSpecializationInfo
/// pointer containing information about the specialization.
/// For function template specializations, this will be a
/// FunctionTemplateSpecializationInfo, which contains information about
/// the template being specialized and the template arguments involved in
/// that specialization.
llvm::PointerUnion4<FunctionTemplateDecl *,
                    MemberSpecializationInfo *,
                    FunctionTemplateSpecializationInfo *,
                    DependentFunctionTemplateSpecializationInfo *>
  TemplateOrSpecialization;

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

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

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

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

1843protected:
FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
             const DeclarationNameInfo &NameInfo, QualType T,
             TypeSourceInfo *TInfo, StorageClass S, bool isInlineSpecified,
             bool isConstexprSpecified)
    : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
                     StartLoc),
      DeclContext(DK), redeclarable_base(C), SClass(S),
      IsInline(isInlineSpecified), IsInlineSpecified(isInlineSpecified),
      IsExplicitSpecified(false), IsVirtualAsWritten(false), IsPure(false),
      HasInheritedPrototype(false), HasWrittenPrototype(true),
      IsDeleted(false), IsTrivial(false), IsTrivialForCall(false),
      IsDefaulted(false),
      IsExplicitlyDefaulted(false), HasImplicitReturnZero(false),
      IsLateTemplateParsed(false), IsConstexpr(isConstexprSpecified),
      InstantiationIsPending(false), UsesSEHTry(false), HasSkippedBody(false),
      WillHaveBody(false), IsMultiVersion(false),
      IsCopyDeductionCandidate(false), HasODRHash(false), ODRHash(0),
      EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {}

using redeclarable_base = Redeclarable<FunctionDecl>;

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

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

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

1877public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

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

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

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

static FunctionDecl *Create(ASTContext &C, DeclContext *DC,
                            SourceLocation StartLoc,
                            const DeclarationNameInfo &NameInfo,
                            QualType T, TypeSourceInfo *TInfo,
                            StorageClass SC,
                            bool isInlineSpecified,
                            bool hasWrittenPrototype,
                            bool isConstexprSpecified = false);

static FunctionDecl *CreateDeserialized(ASTContext &C, unsigned ID);
                     
DeclarationNameInfo getNameInfo() const {
  return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc);
}

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

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

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

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

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

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

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

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

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

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

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

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

/// Returns whether this specific declaration of the function is also a
/// definition that does not contain uninstantiated body.
///
/// This does not determine whether the function has been defined (e.g., in a
/// previous definition); for that information, use isDefined.
bool isThisDeclarationADefinition() const {
  return IsDeleted || IsDefaulted || Body || HasSkippedBody ||
         IsLateTemplateParsed || WillHaveBody || hasDefiningAttr();
}

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

void setBody(Stmt *B);
void setLazyBody(uint64_t Offset) { Body = Offset; }

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

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

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

/// Whether this templated function will be late parsed.
bool isLateTemplateParsed() const { return IsLateTemplateParsed; }
void setLateTemplateParsed(bool ILT = true) { IsLateTemplateParsed = ILT; }

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

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

/// Whether this function is defaulted per C++0x. Only valid for
/// special member functions.
bool isDefaulted() const { return IsDefaulted; }
void setDefaulted(bool D = true) { IsDefaulted = D; }

/// Whether this function is explicitly defaulted per C++0x. Only valid
/// for special member functions.
bool isExplicitlyDefaulted() const { return IsExplicitlyDefaulted; }
void setExplicitlyDefaulted(bool ED = true) { IsExplicitlyDefaulted = ED; }

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

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

bool hasWrittenPrototype() const { return HasWrittenPrototype; }

/// \brief Whether this function inherited its prototype from a
/// previous declaration.
bool hasInheritedPrototype() const { return HasInheritedPrototype; }
void setHasInheritedPrototype(bool P = true) { HasInheritedPrototype = P; }

/// Whether this is a (C++11) constexpr function or constexpr constructor.
bool isConstexpr() const { return IsConstexpr; }
void setConstexpr(bool IC) { IsConstexpr = IC; }

/// \brief Whether the instantiation of this function is pending.
/// This bit is set when the decision to instantiate this function is made
/// and unset if and when the function body is created. That leaves out
/// cases where instantiation did not happen because the template definition
/// was not seen in this TU. This bit remains set in those cases, under the
/// assumption that the instantiation will happen in some other TU.
bool instantiationIsPending() const { return InstantiationIsPending; }
void setInstantiationIsPending(bool IC) { InstantiationIsPending = IC; }

/// \brief Indicates the function uses __try.
bool usesSEHTry() const { return UsesSEHTry; }
void setUsesSEHTry(bool UST) { UsesSEHTry = UST; }

/// \brief Whether this function has been deleted.
///
/// A function that is "deleted" (via the C++0x "= delete" syntax)
/// acts like a normal function, except that it cannot actually be
/// called or have its address taken. Deleted functions are
/// typically used in C++ overload resolution to attract arguments
/// whose type or lvalue/rvalue-ness would permit the use of a
/// different overload that would behave incorrectly. For example,
/// one might use deleted functions to ban implicit conversion from
/// a floating-point number to an Integer type:
///
/// @code
/// struct Integer {
///   Integer(long); // construct from a long
///   Integer(double) = delete; // no construction from float or double
///   Integer(long double) = delete; // no construction from long double
/// };
/// @endcode
// If a function is deleted, its first declaration must be.
bool isDeleted() const { return getCanonicalDecl()->IsDeleted; }
bool isDeletedAsWritten() const { return IsDeleted && !IsDefaulted; }
void setDeletedAsWritten(bool D = true) { IsDeleted = D; }

/// \brief Determines whether this function is "main", which is the
/// entry point into an executable program.
bool isMain() const;

/// \brief Determines whether this function is a MSVCRT user defined entry
/// point.
bool isMSVCRTEntryPoint() const;

/// \brief Determines whether this operator new or delete is one
/// of the reserved global placement operators:
///    void *operator new(size_t, void *);
///    void *operator new[](size_t, void *);
///    void operator delete(void *, void *);
///    void operator delete[](void *, void *);
/// These functions have special behavior under [new.delete.placement]:
///    These functions are reserved, a C++ program may not define
///    functions that displace the versions in the Standard C++ library.
///    The provisions of [basic.stc.dynamic] do not apply to these
///    reserved placement forms of operator new and operator delete.
///
/// This function must be an allocation or deallocation function.
bool isReservedGlobalPlacementOperator() const;

/// \brief Determines whether this function is one of the replaceable
/// global allocation functions:
///    void *operator new(size_t);
///    void *operator new(size_t, const std::nothrow_t &) noexcept;
///    void *operator new[](size_t);
///    void *operator new[](size_t, const std::nothrow_t &) noexcept;
///    void operator delete(void *) noexcept;
///    void operator delete(void *, std::size_t) noexcept;      [C++1y]
///    void operator delete(void *, const std::nothrow_t &) noexcept;
///    void operator delete[](void *) noexcept;
///    void operator delete[](void *, std::size_t) noexcept;    [C++1y]
///    void operator delete[](void *, const std::nothrow_t &) noexcept;
/// These functions have special behavior under C++1y [expr.new]:
///    An implementation is allowed to omit a call to a replaceable global
///    allocation function. [...]
///
/// If this function is an aligned allocation/deallocation function, return
/// true through IsAligned.
bool isReplaceableGlobalAllocationFunction(bool *IsAligned = nullptr) const;

/// \brief Determine whether this is a destroying operator delete.
bool isDestroyingOperatorDelete() const;

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

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

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

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

/// \brief Determines whether this is a global function.
bool isGlobal() const;

/// \brief Determines whether this function is known to be 'noreturn', through
/// an attribute on its declaration or its type.
bool isNoReturn() const;

/// \brief True if the function was a definition but its body was skipped.
bool hasSkippedBody() const { return HasSkippedBody; }
void setHasSkippedBody(bool Skipped = true) { HasSkippedBody = Skipped; }

/// True if this function will eventually have a body, once it's fully parsed.
bool willHaveBody() const { return WillHaveBody; }
void setWillHaveBody(bool V = true) { WillHaveBody = V; }

/// True if this function is considered a multiversioned function.
bool isMultiVersion() const { return getCanonicalDecl()->IsMultiVersion; }

/// Sets the multiversion state for this declaration and all of its
/// redeclarations.
void setIsMultiVersion(bool V = true) {
  getCanonicalDecl()->IsMultiVersion = V;
}

void setPreviousDeclaration(FunctionDecl * PrevDecl);

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

unsigned getBuiltinID() const;

// ArrayRef interface to parameters.
ArrayRef<ParmVarDecl *> parameters() const {
  return {ParamInfo, getNumParams()};
}
MutableArrayRef<ParmVarDecl *> parameters() {
  return {ParamInfo, getNumParams()};
}

// Iterator access to formal parameters.
using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator;
using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator;

bool param_empty() const { return parameters().empty(); }
param_iterator param_begin() { return parameters().begin(); }
param_iterator param_end() { return parameters().end(); }
param_const_iterator param_begin() const { return parameters().begin(); }
param_const_iterator param_end() const { return parameters().end(); }
size_t param_size() const { return parameters().size(); }

/// Return the number of parameters this function must have based on its
/// FunctionType.  This is the length of the ParamInfo array after it has been
/// created.
unsigned getNumParams() const;

const ParmVarDecl *getParamDecl(unsigned i) const {
  assert(i < getNumParams() && "Illegal param #")(static_cast <bool> (i < getNumParams() && "Illegal param #"
) ? void (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2228, __extension__ __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
ParmVarDecl *getParamDecl(unsigned i) {
  assert(i < getNumParams() && "Illegal param #")(static_cast <bool> (i < getNumParams() && "Illegal param #"
) ? void (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2232, __extension__ __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
void setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
  setParams(getASTContext(), NewParamInfo);
}

/// Returns the minimum number of arguments needed to call this function. This
/// may be fewer than the number of function parameters, if some of the
/// parameters have default arguments (in C++).
unsigned getMinRequiredArguments() const;

QualType getReturnType() const {
  assert(getType()->getAs<FunctionType>() && "Expected a FunctionType!")(static_cast <bool> (getType()->getAs<FunctionType
>() && "Expected a FunctionType!") ? void (0) : __assert_fail
 ("getType()->getAs<FunctionType>() && \"Expected a FunctionType!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2245, __extension__ __PRETTY_FUNCTION__));
  return getType()->getAs<FunctionType>()->getReturnType();
}

/// \brief Attempt to compute an informative source range covering the
/// function return type. This may omit qualifiers and other information with
/// limited representation in the AST.
SourceRange getReturnTypeSourceRange() const;

/// \brief Attempt to compute an informative source range covering the
/// function exception specification, if any.
SourceRange getExceptionSpecSourceRange() const;

/// \brief Determine the type of an expression that calls this function.
QualType getCallResultType() const {
  assert(getType()->getAs<FunctionType>() && "Expected a FunctionType!")(static_cast <bool> (getType()->getAs<FunctionType
>() && "Expected a FunctionType!") ? void (0) : __assert_fail
 ("getType()->getAs<FunctionType>() && \"Expected a FunctionType!\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2260, __extension__ __PRETTY_FUNCTION__));
  return getType()->getAs<FunctionType>()->getCallResultType(getASTContext());
}

/// \brief Returns the WarnUnusedResultAttr that is either declared on this
/// function, or its return type declaration.
const Attr *getUnusedResultAttr() const;

/// \brief Returns true if this function or its return type has the
/// warn_unused_result attribute.
bool hasUnusedResultAttr() const { return getUnusedResultAttr() != nullptr; }

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

/// \brief Determine whether the "inline" keyword was specified for this
/// function.
bool isInlineSpecified() const { return IsInlineSpecified; }

/// Set whether the "inline" keyword was specified for this function.
void setInlineSpecified(bool I) {
  IsInlineSpecified = I;
  IsInline = I;
}

/// Flag that this function is implicitly inline.
void setImplicitlyInline() {
  IsInline = true;
}

/// \brief Determine whether this function should be inlined, because it is
/// either marked "inline" or "constexpr" or is a member function of a class
/// that was defined in the class body.
bool isInlined() const { return IsInline; }

bool isInlineDefinitionExternallyVisible() const;

bool isMSExternInline() const;

bool doesDeclarationForceExternallyVisibleDefinition() const;

/// Whether this function declaration represents an C++ overloaded
/// operator, e.g., "operator+".
bool isOverloadedOperator() const {
  return getOverloadedOperator() != OO_None;
}

OverloadedOperatorKind getOverloadedOperator() const;

const IdentifierInfo *getLiteralIdentifier() const;

/// \brief If this function is an instantiation of a member function
/// of a class template specialization, retrieves the function from
/// which it was instantiated.
///
/// This routine will return non-NULL for (non-templated) member
/// functions of class templates and for instantiations of function
/// templates. For example, given:
///
/// \code
/// template<typename T>
/// struct X {
///   void f(T);
/// };
/// \endcode
///
/// The declaration for X<int>::f is a (non-templated) FunctionDecl
/// whose parent is the class template specialization X<int>. For
/// this declaration, getInstantiatedFromFunction() will return
/// the FunctionDecl X<T>::A. When a complete definition of
/// X<int>::A is required, it will be instantiated from the
/// declaration returned by getInstantiatedFromMemberFunction().
FunctionDecl *getInstantiatedFromMemberFunction() const;

/// \brief What kind of templated function this is.
TemplatedKind getTemplatedKind() const;

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

/// \brief Specify that this record is an instantiation of the
/// member function FD.
void setInstantiationOfMemberFunction(FunctionDecl *FD,
                                      TemplateSpecializationKind TSK) {
  setInstantiationOfMemberFunction(getASTContext(), FD, TSK);
}

/// \brief Retrieves the function template that is described by this
/// function declaration.
///
/// Every function template is represented as a FunctionTemplateDecl
/// and a FunctionDecl (or something derived from FunctionDecl). The
/// former contains template properties (such as the template
/// parameter lists) while the latter contains the actual
/// description of the template's
/// contents. FunctionTemplateDecl::getTemplatedDecl() retrieves the
/// FunctionDecl that describes the function template,
/// getDescribedFunctionTemplate() retrieves the
/// FunctionTemplateDecl from a FunctionDecl.
FunctionTemplateDecl *getDescribedFunctionTemplate() const;

void setDescribedFunctionTemplate(FunctionTemplateDecl *Template);

/// \brief Determine whether this function is a function template
/// specialization.
bool isFunctionTemplateSpecialization() const {
  return getPrimaryTemplate() != nullptr;
}

/// \brief Retrieve the class scope template pattern that this function
///  template specialization is instantiated from.
FunctionDecl *getClassScopeSpecializationPattern() const;

/// \brief If this function is actually a function template specialization,
/// retrieve information about this function template specialization.
/// Otherwise, returns NULL.
FunctionTemplateSpecializationInfo *getTemplateSpecializationInfo() const;

/// \brief Determines whether this function is a function template
/// specialization or a member of a class template specialization that can
/// be implicitly instantiated.
bool isImplicitlyInstantiable() const;

/// \brief Determines if the given function was instantiated from a
/// function template.
bool isTemplateInstantiation() const;

/// \brief Retrieve the function declaration from which this function could
/// be instantiated, if it is an instantiation (rather than a non-template
/// or a specialization, for example).
FunctionDecl *getTemplateInstantiationPattern() const;

/// \brief Retrieve the primary template that this function template
/// specialization either specializes or was instantiated from.
///
/// If this function declaration is not a function template specialization,
/// returns NULL.
FunctionTemplateDecl *getPrimaryTemplate() const;

/// \brief Retrieve the template arguments used to produce this function
/// template specialization from the primary template.
///
/// If this function declaration is not a function template specialization,
/// returns NULL.
const TemplateArgumentList *getTemplateSpecializationArgs() const;

/// \brief Retrieve the template argument list as written in the sources,
/// if any.
///
/// If this function declaration is not a function template specialization
/// or if it had no explicit template argument list, returns NULL.
/// Note that it an explicit template argument list may be written empty,
/// e.g., template<> void foo<>(char* s);
const ASTTemplateArgumentListInfo*
getTemplateSpecializationArgsAsWritten() const;

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

/// \brief Specifies that this function declaration is actually a
/// dependent function template specialization.
void setDependentTemplateSpecialization(ASTContext &Context,
                           const UnresolvedSetImpl &Templates,
                    const TemplateArgumentListInfo &TemplateArgs);

DependentFunctionTemplateSpecializationInfo *
getDependentSpecializationInfo() const;

/// \brief Determine what kind of template instantiation this function
/// represents.
TemplateSpecializationKind getTemplateSpecializationKind() const;

/// \brief Determine what kind of template instantiation this function
/// represents.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                      SourceLocation PointOfInstantiation = SourceLocation());

/// \brief Retrieve the (first) point of instantiation of a function template
/// specialization or a member of a class template specialization.
///
/// \returns the first point of instantiation, if this function was
/// instantiated from a template; otherwise, returns an invalid source
/// location.
SourceLocation getPointOfInstantiation() const;

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

/// \brief Identify a memory copying or setting function.
/// If the given function is a memory copy or setting function, returns
/// the corresponding Builtin ID. If the function is not a memory function,
/// returns 0.
unsigned getMemoryFunctionKind() const;

/// \brief Returns ODRHash of the function.  This value is calculated and
/// stored on first call, then the stored value returned on the other calls.
unsigned getODRHash();

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) {
  return K >= firstFunction && K <= lastFunction;
}
static DeclContext *castToDeclContext(const FunctionDecl *D) {
  return static_cast<DeclContext *>(const_cast<FunctionDecl*>(D));
}
static FunctionDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<FunctionDecl *>(const_cast<DeclContext*>(DC));
}
2500};

2502/// Represents a member of a struct/union/class.
2503class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> {
unsigned BitField : 1;
unsigned Mutable : 1;
mutable unsigned CachedFieldIndex : 30;

/// The kinds of value we can store in InitializerOrBitWidth.
///
/// Note that this is compatible with InClassInitStyle except for
/// ISK_CapturedVLAType.
enum InitStorageKind {
  /// If the pointer is null, there's nothing special.  Otherwise,
  /// this is a bitfield and the pointer is the Expr* storing the
  /// bit-width.
  ISK_NoInit = (unsigned) ICIS_NoInit,

  /// The pointer is an (optional due to delayed parsing) Expr*
  /// holding the copy-initializer.
  ISK_InClassCopyInit = (unsigned) ICIS_CopyInit,

  /// The pointer is an (optional due to delayed parsing) Expr*
  /// holding the list-initializer.
  ISK_InClassListInit = (unsigned) ICIS_ListInit,

  /// The pointer is a VariableArrayType* that's been captured;
  /// the enclosing context is a lambda or captured statement.
  ISK_CapturedVLAType,
};

/// If this is a bitfield with a default member initializer, this
/// structure is used to represent the two expressions.
struct InitAndBitWidth {
  Expr *Init;
  Expr *BitWidth;
};

/// \brief Storage for either the bit-width, the in-class initializer, or
/// both (via InitAndBitWidth), or the captured variable length array bound.
///
/// If the storage kind is ISK_InClassCopyInit or
/// ISK_InClassListInit, but the initializer is null, then this
/// field has an in-class initializer that has not yet been parsed
/// and attached.
// FIXME: Tail-allocate this to reduce the size of FieldDecl in the
// overwhelmingly common case that we have none of these things.
llvm::PointerIntPair<void *, 2, InitStorageKind> InitStorage;

2549protected:
FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc,
          SourceLocation IdLoc, IdentifierInfo *Id,
          QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
          InClassInitStyle InitStyle)
  : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
    BitField(false), Mutable(Mutable), CachedFieldIndex(0),
    InitStorage(nullptr, (InitStorageKind) InitStyle) {
  if (BW)
    setBitWidth(BW);
}

2561public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static FieldDecl *Create(const ASTContext &C, DeclContext *DC,
                         SourceLocation StartLoc, SourceLocation IdLoc,
                         IdentifierInfo *Id, QualType T,
                         TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
                         InClassInitStyle InitStyle);

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

/// Returns the index of this field within its record,
/// as appropriate for passing to ASTRecordLayout::getFieldOffset.
unsigned getFieldIndex() const;

/// Determines whether this field is mutable (C++ only).
bool isMutable() const { return Mutable; }

/// Determines whether this field is a bitfield.
bool isBitField() const { return BitField; }

/// Determines whether this is an unnamed bitfield.
bool isUnnamedBitfield() const { return isBitField() && !getDeclName(); }

/// Determines whether this field is a
/// representative for an anonymous struct or union. Such fields are
/// unnamed and are implicitly generated by the implementation to
/// store the data for the anonymous union or struct.
bool isAnonymousStructOrUnion() const;

Expr *getBitWidth() const {
  if (!BitField)
    return nullptr;
  void *Ptr = InitStorage.getPointer();
  if (getInClassInitStyle())
    return static_cast<InitAndBitWidth*>(Ptr)->BitWidth;
  return static_cast<Expr*>(Ptr);
}

unsigned getBitWidthValue(const ASTContext &Ctx) const;

/// Set the bit-field width for this member.
// Note: used by some clients (i.e., do not remove it).
void setBitWidth(Expr *Width) {
  assert(!hasCapturedVLAType() && !BitField &&(static_cast <bool> (!hasCapturedVLAType() && !
BitField && "bit width or captured type already set")
 ? void (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2607, __extension__ __PRETTY_FUNCTION__))
         "bit width or captured type already set")(static_cast <bool> (!hasCapturedVLAType() && !
BitField && "bit width or captured type already set")
 ? void (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2607, __extension__ __PRETTY_FUNCTION__));
  assert(Width && "no bit width specified")(static_cast <bool> (Width && "no bit width specified"
) ? void (0) : __assert_fail ("Width && \"no bit width specified\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2608, __extension__ __PRETTY_FUNCTION__));
  InitStorage.setPointer(
      InitStorage.getInt()
          ? new (getASTContext())
                InitAndBitWidth{getInClassInitializer(), Width}
          : static_cast<void*>(Width));
  BitField = true;
}

/// Remove the bit-field width from this member.
// Note: used by some clients (i.e., do not remove it).
void removeBitWidth() {
  assert(isBitField() && "no bitfield width to remove")(static_cast <bool> (isBitField() && "no bitfield width to remove"
) ? void (0) : __assert_fail ("isBitField() && \"no bitfield width to remove\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2620, __extension__ __PRETTY_FUNCTION__));
  InitStorage.setPointer(getInClassInitializer());
  BitField = false;
}

/// Get the kind of (C++11) default member initializer that this field has.
InClassInitStyle getInClassInitStyle() const {
  InitStorageKind storageKind = InitStorage.getInt();
  return (storageKind == ISK_CapturedVLAType
            ? ICIS_NoInit : (InClassInitStyle) storageKind);
}

/// Determine whether this member has a C++11 default member initializer.
bool hasInClassInitializer() const {
  return getInClassInitStyle() != ICIS_NoInit;
}

/// Get the C++11 default member initializer for this member, or null if one
/// has not been set. If a valid declaration has a default member initializer,
/// but this returns null, then we have not parsed and attached it yet.
Expr *getInClassInitializer() const {
  if (!hasInClassInitializer())
    return nullptr;
  void *Ptr = InitStorage.getPointer();
  if (BitField)
    return static_cast<InitAndBitWidth*>(Ptr)->Init;
  return static_cast<Expr*>(Ptr);
}

/// Set the C++11 in-class initializer for this member.
void setInClassInitializer(Expr *Init) {
  assert(hasInClassInitializer() && !getInClassInitializer())(static_cast <bool> (hasInClassInitializer() &&
 !getInClassInitializer()) ? void (0) : __assert_fail ("hasInClassInitializer() && !getInClassInitializer()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2651, __extension__ __PRETTY_FUNCTION__));
  if (BitField)
    static_cast<InitAndBitWidth*>(InitStorage.getPointer())->Init = Init;
  else
    InitStorage.setPointer(Init);
}

/// Remove the C++11 in-class initializer from this member.
void removeInClassInitializer() {
  assert(hasInClassInitializer() && "no initializer to remove")(static_cast <bool> (hasInClassInitializer() &&
 "no initializer to remove") ? void (0) : __assert_fail ("hasInClassInitializer() && \"no initializer to remove\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2660, __extension__ __PRETTY_FUNCTION__));
  InitStorage.setPointerAndInt(getBitWidth(), ISK_NoInit);
}

/// \brief Determine whether this member captures the variable length array
/// type.
bool hasCapturedVLAType() const {
  return InitStorage.getInt() == ISK_CapturedVLAType;
}

/// \brief Get the captured variable length array type.
const VariableArrayType *getCapturedVLAType() const {
  return hasCapturedVLAType() ? static_cast<const VariableArrayType *>(
                                    InitStorage.getPointer())
                              : nullptr;
}

/// \brief Set the captured variable length array type for this field.
void setCapturedVLAType(const VariableArrayType *VLAType);

/// Returns the parent of this field declaration, which
/// is the struct in which this field is defined.
const RecordDecl *getParent() const {
  return cast<RecordDecl>(getDeclContext());
}

RecordDecl *getParent() {
  return cast<RecordDecl>(getDeclContext());
}

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

/// Retrieves the canonical declaration of this field.
FieldDecl *getCanonicalDecl() override { return getFirstDecl(); }
const FieldDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstField && K <= lastField; }
2699};

2701/// An instance of this object exists for each enum constant
2702/// that is defined.  For example, in "enum X {a,b}", each of a/b are
2703/// EnumConstantDecl's, X is an instance of EnumDecl, and the type of a/b is a
2704/// TagType for the X EnumDecl.
2705class EnumConstantDecl : public ValueDecl, public Mergeable<EnumConstantDecl> {
Stmt *Init; // an integer constant expression
llvm::APSInt Val; // The value.

2709protected:
EnumConstantDecl(DeclContext *DC, SourceLocation L,
                 IdentifierInfo *Id, QualType T, Expr *E,
                 const llvm::APSInt &V)
  : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt*)E), Val(V) {}

2715public:
friend class StmtIteratorBase;

static EnumConstantDecl *Create(ASTContext &C, EnumDecl *DC,
                                SourceLocation L, IdentifierInfo *Id,
                                QualType T, Expr *E,
                                const llvm::APSInt &V);
static EnumConstantDecl *CreateDeserialized(ASTContext &C, unsigned ID);

const Expr *getInitExpr() const { return (const Expr*) Init; }
Expr *getInitExpr() { return (Expr*) Init; }
const llvm::APSInt &getInitVal() const { return Val; }

void setInitExpr(Expr *E) { Init = (Stmt*) E; }
void setInitVal(const llvm::APSInt &V) { Val = V; }

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

/// Retrieves the canonical declaration of this enumerator.
EnumConstantDecl *getCanonicalDecl() override { return getFirstDecl(); }
const EnumConstantDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == EnumConstant; }
2740};

2742/// Represents a field injected from an anonymous union/struct into the parent
2743/// scope. These are always implicit.
2744class IndirectFieldDecl : public ValueDecl,
                        public Mergeable<IndirectFieldDecl> {
NamedDecl **Chaining;
unsigned ChainingSize;

IndirectFieldDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                  DeclarationName N, QualType T,
                  MutableArrayRef<NamedDecl *> CH);

void anchor() override;

2755public:
friend class ASTDeclReader;

static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation L, IdentifierInfo *Id,
                                 QualType T, llvm::MutableArrayRef<NamedDecl *> CH);

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

using chain_iterator = ArrayRef<NamedDecl *>::const_iterator;

ArrayRef<NamedDecl *> chain() const {
  return llvm::makeArrayRef(Chaining, ChainingSize);
}
chain_iterator chain_begin() const { return chain().begin(); }
chain_iterator chain_end() const { return chain().end(); }

unsigned getChainingSize() const { return ChainingSize; }

FieldDecl *getAnonField() const {
  assert(chain().size() >= 2)(static_cast <bool> (chain().size() >= 2) ? void (0)
 : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2775, __extension__ __PRETTY_FUNCTION__));
  return cast<FieldDecl>(chain().back());
}

VarDecl *getVarDecl() const {
  assert(chain().size() >= 2)(static_cast <bool> (chain().size() >= 2) ? void (0)
 : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 2780, __extension__ __PRETTY_FUNCTION__));
  return dyn_cast<VarDecl>(chain().front());
}

IndirectFieldDecl *getCanonicalDecl() override { return getFirstDecl(); }
const IndirectFieldDecl *getCanonicalDecl() const { return getFirstDecl(); }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == IndirectField; }
2790};

2792/// Represents a declaration of a type.
2793class TypeDecl : public NamedDecl {
friend class ASTContext;

/// This indicates the Type object that represents
/// this TypeDecl.  It is a cache maintained by
/// ASTContext::getTypedefType, ASTContext::getTagDeclType, and
/// ASTContext::getTemplateTypeParmType, and TemplateTypeParmDecl.
mutable const Type *TypeForDecl = nullptr;

/// The start of the source range for this declaration.
SourceLocation LocStart;

void anchor() override;

2807protected:
TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id,
         SourceLocation StartL = SourceLocation())
  : NamedDecl(DK, DC, L, Id), LocStart(StartL) {}

2812public:
// Low-level accessor. If you just want the type defined by this node,
// check out ASTContext::getTypeDeclType or one of
// ASTContext::getTypedefType, ASTContext::getRecordType, etc. if you
// already know the specific kind of node this is.
const Type *getTypeForDecl() const { return TypeForDecl; }
void setTypeForDecl(const Type *TD) { TypeForDecl = TD; }

SourceLocation getLocStart() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; }
void setLocStart(SourceLocation L) { LocStart = L; }
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  if (LocStart.isValid())
    return SourceRange(LocStart, getLocation());
  else
    return SourceRange(getLocation());
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K >= firstType && K <= lastType; }
2832};

2834/// Base class for declarations which introduce a typedef-name.
2835class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> {
struct LLVM_ALIGNAS(8)alignas(8) ModedTInfo {
  TypeSourceInfo *first;
  QualType second;
};

/// If int part is 0, we have not computed IsTransparentTag.
/// Otherwise, IsTransparentTag is (getInt() >> 1).
mutable llvm::PointerIntPair<
    llvm::PointerUnion<TypeSourceInfo *, ModedTInfo *>, 2>
    MaybeModedTInfo;

void anchor() override;

2849protected:
TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC,
                SourceLocation StartLoc, SourceLocation IdLoc,
                IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C),
      MaybeModedTInfo(TInfo, 0) {}

using redeclarable_base = Redeclarable<TypedefNameDecl>;

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

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

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

2870public:
using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

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

bool isModed() const {
  return MaybeModedTInfo.getPointer().is<ModedTInfo *>();
}

TypeSourceInfo *getTypeSourceInfo() const {
  return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->first
                   : MaybeModedTInfo.getPointer().get<TypeSourceInfo *>();
}

QualType getUnderlyingType() const {
  return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->second
                   : MaybeModedTInfo.getPointer()
                         .get<TypeSourceInfo *>()
                         ->getType();
}

void setTypeSourceInfo(TypeSourceInfo *newType) {
  MaybeModedTInfo.setPointer(newType);
}

void setModedTypeSourceInfo(TypeSourceInfo *unmodedTSI, QualType modedTy) {
  MaybeModedTInfo.setPointer(new (getASTContext(), 8)
                                 ModedTInfo({unmodedTSI, modedTy}));
}

/// Retrieves the canonical declaration of this typedef-name.
TypedefNameDecl *getCanonicalDecl() override { return getFirstDecl(); }
const TypedefNameDecl *getCanonicalDecl() const { return getFirstDecl(); }

/// Retrieves the tag declaration for which this is the typedef name for
/// linkage purposes, if any.
///
/// \param AnyRedecl Look for the tag declaration in any redeclaration of
/// this typedef declaration.
TagDecl *getAnonDeclWithTypedefName(bool AnyRedecl = false) const;

/// Determines if this typedef shares a name and spelling location with its
/// underlying tag type, as is the case with the NS_ENUM macro.
bool isTransparentTag() const {
  if (MaybeModedTInfo.getInt())
    return MaybeModedTInfo.getInt() & 0x2;
  return isTransparentTagSlow();
}

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

2931private:
bool isTransparentTagSlow() const;
2933};

2935/// Represents the declaration of a typedef-name via the 'typedef'
2936/// type specifier.
2937class TypedefDecl : public TypedefNameDecl {
TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
            SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {}

2942public:
static TypedefDecl *Create(ASTContext &C, DeclContext *DC,
                           SourceLocation StartLoc, SourceLocation IdLoc,
                           IdentifierInfo *Id, TypeSourceInfo *TInfo);
static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID);

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Typedef; }
2953};

2955/// Represents the declaration of a typedef-name via a C++11
2956/// alias-declaration.
2957class TypeAliasDecl : public TypedefNameDecl {
/// The template for which this is the pattern, if any.
TypeAliasTemplateDecl *Template;

TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
              SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
    : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo),
      Template(nullptr) {}

2966public:
static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC,
                             SourceLocation StartLoc, SourceLocation IdLoc,
                             IdentifierInfo *Id, TypeSourceInfo *TInfo);
static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID);

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

TypeAliasTemplateDecl *getDescribedAliasTemplate() const { return Template; }
void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT) { Template = TAT; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TypeAlias; }
2980};

2982/// Represents the declaration of a struct/union/class/enum.
2983class TagDecl
: public TypeDecl, public DeclContext, public Redeclarable<TagDecl> {
2985public:
// This is really ugly.
using TagKind = TagTypeKind;

2989private:
// FIXME: This can be packed into the bitfields in Decl.
/// The TagKind enum.
unsigned TagDeclKind : 3;

/// True if this is a definition ("struct foo {};"), false if it is a
/// declaration ("struct foo;").  It is not considered a definition
/// until the definition has been fully processed.
unsigned IsCompleteDefinition : 1;

2999protected:
/// True if this is currently being defined.
unsigned IsBeingDefined : 1;

3003private:
/// True if this tag declaration is "embedded" (i.e., defined or declared
/// for the very first time) in the syntax of a declarator.
unsigned IsEmbeddedInDeclarator : 1;

/// True if this tag is free standing, e.g. "struct foo;".
unsigned IsFreeStanding : 1;

3011protected:
// These are used by (and only defined for) EnumDecl.
unsigned NumPositiveBits : 8;
unsigned NumNegativeBits : 8;

/// True if this tag declaration is a scoped enumeration. Only
/// possible in C++11 mode.
unsigned IsScoped : 1;

/// If this tag declaration is a scoped enum,
/// then this is true if the scoped enum was declared using the class
/// tag, false if it was declared with the struct tag. No meaning is
/// associated if this tag declaration is not a scoped enum.
unsigned IsScopedUsingClassTag : 1;

/// True if this is an enumeration with fixed underlying type. Only
/// possible in C++11, Microsoft extensions, or Objective C mode.
unsigned IsFixed : 1;

/// Indicates whether it is possible for declarations of this kind
/// to have an out-of-date definition.
///
/// This option is only enabled when modules are enabled.
unsigned MayHaveOutOfDateDef : 1;

/// Has the full definition of this type been required by a use somewhere in
/// the TU.
unsigned IsCompleteDefinitionRequired : 1;

3040private:
SourceRange BraceRange;

// A struct representing syntactic qualifier info,
// to be used for the (uncommon) case of out-of-line declarations.
using ExtInfo = QualifierInfo;

/// \brief If the (out-of-line) tag declaration name
/// is qualified, it points to the qualifier info (nns and range);
/// otherwise, if the tag declaration is anonymous and it is part of
/// a typedef or alias, it points to the TypedefNameDecl (used for mangling);
/// otherwise, if the tag declaration is anonymous and it is used as a
/// declaration specifier for variables, it points to the first VarDecl (used
/// for mangling);
/// otherwise, it is a null (TypedefNameDecl) pointer.
llvm::PointerUnion<TypedefNameDecl *, ExtInfo *> TypedefNameDeclOrQualifier;

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

3063protected:
TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
        SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
        SourceLocation StartL)
    : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
      TagDeclKind(TK), IsCompleteDefinition(false), IsBeingDefined(false),
      IsEmbeddedInDeclarator(false), IsFreeStanding(false),
      IsCompleteDefinitionRequired(false),
      TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
  assert((DK != Enum || TK == TTK_Enum) &&(static_cast <bool> ((DK != Enum || TK == TTK_Enum) &&
 "EnumDecl not matched with TTK_Enum") ? void (0) : __assert_fail
 ("(DK != Enum || TK == TTK_Enum) && \"EnumDecl not matched with TTK_Enum\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3073, __extension__ __PRETTY_FUNCTION__))
         "EnumDecl not matched with TTK_Enum")(static_cast <bool> ((DK != Enum || TK == TTK_Enum) &&
 "EnumDecl not matched with TTK_Enum") ? void (0) : __assert_fail
 ("(DK != Enum || TK == TTK_Enum) && \"EnumDecl not matched with TTK_Enum\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3073, __extension__ __PRETTY_FUNCTION__));
  setPreviousDecl(PrevDecl);
}

using redeclarable_base = Redeclarable<TagDecl>;

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

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

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

/// @brief Completes the definition of this tag declaration.
///
/// This is a helper function for derived classes.
void completeDefinition();

3096public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

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

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

SourceRange getBraceRange() const { return BraceRange; }
void setBraceRange(SourceRange R) { BraceRange = R; }

/// Return SourceLocation representing start of source
/// range ignoring outer template declarations.
SourceLocation getInnerLocStart() const { return getLocStart(); }

/// Return SourceLocation representing start of source
/// range taking into account any outer template declarations.
SourceLocation getOuterLocStart() const;
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

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

/// Return true if this declaration is a completion definition of the type.
/// Provided for consistency.
bool isThisDeclarationADefinition() const {
  return isCompleteDefinition();
}

/// Return true if this decl has its body fully specified.
bool isCompleteDefinition() const {
  return IsCompleteDefinition;
}

/// \brief Return true if this complete decl is
/// required to be complete for some existing use.
bool isCompleteDefinitionRequired() const {
  return IsCompleteDefinitionRequired;
}

/// Return true if this decl is currently being defined.
bool isBeingDefined() const {
  return IsBeingDefined;
}

bool isEmbeddedInDeclarator() const {
  return IsEmbeddedInDeclarator;
}
void setEmbeddedInDeclarator(bool isInDeclarator) {
  IsEmbeddedInDeclarator = isInDeclarator;
}

bool isFreeStanding() const { return IsFreeStanding; }
void setFreeStanding(bool isFreeStanding = true) {
  IsFreeStanding = isFreeStanding;
}

/// \brief Whether this declaration declares a type that is
/// dependent, i.e., a type that somehow depends on template
/// parameters.
bool isDependentType() const { return isDependentContext(); }

/// Starts the definition of this tag declaration.
///
/// This method should be invoked at the beginning of the definition
/// of this tag declaration. It will set the tag type into a state
/// where it is in the process of being defined.
void startDefinition();

/// Returns the TagDecl that actually defines this
///  struct/union/class/enum.  When determining whether or not a
///  struct/union/class/enum has a definition, one should use this
///  method as opposed to 'isDefinition'.  'isDefinition' indicates
///  whether or not a specific TagDecl is defining declaration, not
///  whether or not the struct/union/class/enum type is defined.
///  This method returns NULL if there is no TagDecl that defines
///  the struct/union/class/enum.
TagDecl *getDefinition() const;

void setCompleteDefinition(bool V) { IsCompleteDefinition = V; }

void setCompleteDefinitionRequired(bool V = true) {
  IsCompleteDefinitionRequired = V;
}

StringRef getKindName() const {
  return TypeWithKeyword::getTagTypeKindName(getTagKind());
}

TagKind getTagKind() const {
  return TagKind(TagDeclKind);
}

void setTagKind(TagKind TK) { TagDeclKind = TK; }

bool isStruct() const { return getTagKind() == TTK_Struct; }
bool isInterface() const { return getTagKind() == TTK_Interface; }
bool isClass()  const { return getTagKind() == TTK_Class; }
bool isUnion()  const { return getTagKind() == TTK_Union; }
bool isEnum()   const { return getTagKind() == TTK_Enum; }

/// Is this tag type named, either directly or via being defined in
/// a typedef of this type?
///
/// C++11 [basic.link]p8:
///   A type is said to have linkage if and only if:
///     - it is a class or enumeration type that is named (or has a
///       name for linkage purposes) and the name has linkage; ...
/// C++11 [dcl.typedef]p9:
///   If the typedef declaration defines an unnamed class (or enum),
///   the first typedef-name declared by the declaration to be that
///   class type (or enum type) is used to denote the class type (or
///   enum type) for linkage purposes only.
///
/// C does not have an analogous rule, but the same concept is
/// nonetheless useful in some places.
bool hasNameForLinkage() const {
  return (getDeclName() || getTypedefNameForAnonDecl());
}

TypedefNameDecl *getTypedefNameForAnonDecl() const {
  return hasExtInfo() ? nullptr
                      : TypedefNameDeclOrQualifier.get<TypedefNameDecl *>();
}

void setTypedefNameForAnonDecl(TypedefNameDecl *TDD);

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

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

void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc);

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

TemplateParameterList *getTemplateParameterList(unsigned i) const {
  assert(i < getNumTemplateParameterLists())(static_cast <bool> (i < getNumTemplateParameterLists
()) ? void (0) : __assert_fail ("i < getNumTemplateParameterLists()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3253, __extension__ __PRETTY_FUNCTION__));
  return getExtInfo()->TemplParamLists[i];
}

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

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

static DeclContext *castToDeclContext(const TagDecl *D) {
  return static_cast<DeclContext *>(const_cast<TagDecl*>(D));
}

static TagDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<TagDecl *>(const_cast<DeclContext*>(DC));
}
3271};

3273/// Represents an enum.  In C++11, enums can be forward-declared
3274/// with a fixed underlying type, and in C we allow them to be forward-declared
3275/// with no underlying type as an extension.
3276class EnumDecl : public TagDecl {
/// This represent the integer type that the enum corresponds
/// to for code generation purposes.  Note that the enumerator constants may
/// have a different type than this does.
///
/// If the underlying integer type was explicitly stated in the source
/// code, this is a TypeSourceInfo* for that type. Otherwise this type
/// was automatically deduced somehow, and this is a Type*.
///
/// Normally if IsFixed(), this would contain a TypeSourceInfo*, but in
/// some cases it won't.
///
/// The underlying type of an enumeration never has any qualifiers, so
/// we can get away with just storing a raw Type*, and thus save an
/// extra pointer when TypeSourceInfo is needed.
llvm::PointerUnion<const Type *, TypeSourceInfo *> IntegerType;

/// The integer type that values of this type should
/// promote to.  In C, enumerators are generally of an integer type
/// directly, but gcc-style large enumerators (and all enumerators
/// in C++) are of the enum type instead.
QualType PromotionType;

/// \brief If this enumeration is an instantiation of a member enumeration
/// of a class template specialization, this is the member specialization
/// information.
MemberSpecializationInfo *SpecializationInfo = nullptr;

EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
         SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
         bool Scoped, bool ScopedUsingClassTag, bool Fixed)
    : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
  assert(Scoped || !ScopedUsingClassTag)(static_cast <bool> (Scoped || !ScopedUsingClassTag) ? void
 (0) : __assert_fail ("Scoped || !ScopedUsingClassTag", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3308, __extension__ __PRETTY_FUNCTION__));
  IntegerType = (const Type *)nullptr;
  NumNegativeBits = 0;
  NumPositiveBits = 0;
  IsScoped = Scoped;
  IsScopedUsingClassTag = ScopedUsingClassTag;
  IsFixed = Fixed;
}

void anchor() override;

void setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
                                  TemplateSpecializationKind TSK);
3321public:
friend class ASTDeclReader;

EnumDecl *getCanonicalDecl() override {
  return cast<EnumDecl>(TagDecl::getCanonicalDecl());
}
const EnumDecl *getCanonicalDecl() const {
  return const_cast<EnumDecl*>(this)->getCanonicalDecl();
}

EnumDecl *getPreviousDecl() {
  return cast_or_null<EnumDecl>(
          static_cast<TagDecl *>(this)->getPreviousDecl());
}
const EnumDecl *getPreviousDecl() const {
  return const_cast<EnumDecl*>(this)->getPreviousDecl();
}

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

EnumDecl *getDefinition() const {
  return cast_or_null<EnumDecl>(TagDecl::getDefinition());
}

static EnumDecl *Create(ASTContext &C, DeclContext *DC,
                        SourceLocation StartLoc, SourceLocation IdLoc,
                        IdentifierInfo *Id, EnumDecl *PrevDecl,
                        bool IsScoped, bool IsScopedUsingClassTag,
                        bool IsFixed);
static EnumDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// When created, the EnumDecl corresponds to a
/// forward-declared enum. This method is used to mark the
/// declaration as being defined; its enumerators have already been
/// added (via DeclContext::addDecl). NewType is the new underlying
/// type of the enumeration type.
void completeDefinition(QualType NewType,
                        QualType PromotionType,
                        unsigned NumPositiveBits,
                        unsigned NumNegativeBits);

// Iterates through the enumerators of this enumeration.
using enumerator_iterator = specific_decl_iterator<EnumConstantDecl>;
using enumerator_range =
    llvm::iterator_range<specific_decl_iterator<EnumConstantDecl>>;

enumerator_range enumerators() const {
  return enumerator_range(enumerator_begin(), enumerator_end());
}

enumerator_iterator enumerator_begin() const {
  const EnumDecl *E = getDefinition();
  if (!E)
    E = this;
  return enumerator_iterator(E->decls_begin());
}

enumerator_iterator enumerator_end() const {
  const EnumDecl *E = getDefinition();
  if (!E)
    E = this;
  return enumerator_iterator(E->decls_end());
}

/// Return the integer type that enumerators should promote to.
QualType getPromotionType() const { return PromotionType; }

/// Set the promotion type.
void setPromotionType(QualType T) { PromotionType = T; }

/// Return the integer type this enum decl corresponds to.
/// This returns a null QualType for an enum forward definition with no fixed
/// underlying type.
QualType getIntegerType() const {
  if (!IntegerType)
    return QualType();
  if (const Type *T = IntegerType.dyn_cast<const Type*>())
    return QualType(T, 0);
  return IntegerType.get<TypeSourceInfo*>()->getType().getUnqualifiedType();
}

/// \brief Set the underlying integer type.
void setIntegerType(QualType T) { IntegerType = T.getTypePtrOrNull(); }

/// \brief Set the underlying integer type source info.
void setIntegerTypeSourceInfo(TypeSourceInfo *TInfo) { IntegerType = TInfo; }

/// \brief Return the type source info for the underlying integer type,
/// if no type source info exists, return 0.
TypeSourceInfo *getIntegerTypeSourceInfo() const {
  return IntegerType.dyn_cast<TypeSourceInfo*>();
}

/// \brief Retrieve the source range that covers the underlying type if
/// specified.
SourceRange getIntegerTypeRange() const LLVM_READONLY__attribute__((__pure__));

/// \brief Returns the width in bits required to store all the
/// non-negative enumerators of this enum.
unsigned getNumPositiveBits() const {
  return NumPositiveBits;
}
void setNumPositiveBits(unsigned Num) {
  NumPositiveBits = Num;
  assert(NumPositiveBits == Num && "can't store this bitcount")(static_cast <bool> (NumPositiveBits == Num && "can't store this bitcount"
) ? void (0) : __assert_fail ("NumPositiveBits == Num && \"can't store this bitcount\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3430, __extension__ __PRETTY_FUNCTION__));
}

/// \brief Returns the width in bits required to store all the
/// negative enumerators of this enum.  These widths include
/// the rightmost leading 1;  that is:
///
/// MOST NEGATIVE ENUMERATOR     PATTERN     NUM NEGATIVE BITS
/// ------------------------     -------     -----------------
///                       -1     1111111                     1
///                      -10     1110110                     5
///                     -101     1001011                     8
unsigned getNumNegativeBits() const {
  return NumNegativeBits;
}
void setNumNegativeBits(unsigned Num) {
  NumNegativeBits = Num;
}

/// \brief Returns true if this is a C++11 scoped enumeration.
bool isScoped() const {
  return IsScoped;
}

/// \brief Returns true if this is a C++11 scoped enumeration.
bool isScopedUsingClassTag() const {
  return IsScopedUsingClassTag;
}

/// \brief Returns true if this is an Objective-C, C++11, or
/// Microsoft-style enumeration with a fixed underlying type.
bool isFixed() const {
  return IsFixed;
}

/// \brief Returns true if this can be considered a complete type.
bool isComplete() const {
  // IntegerType is set for fixed type enums and non-fixed but implicitly
  // int-sized Microsoft enums.
  return isCompleteDefinition() || IntegerType;
}

/// Returns true if this enum is either annotated with
/// enum_extensibility(closed) or isn't annotated with enum_extensibility.
bool isClosed() const;

/// Returns true if this enum is annotated with flag_enum and isn't annotated
/// with enum_extensibility(open).
bool isClosedFlag() const;

/// Returns true if this enum is annotated with neither flag_enum nor
/// enum_extensibility(open).
bool isClosedNonFlag() const;

/// \brief Retrieve the enum definition from which this enumeration could
/// be instantiated, if it is an instantiation (rather than a non-template).
EnumDecl *getTemplateInstantiationPattern() const;

/// \brief Returns the enumeration (declared within the template)
/// from which this enumeration type was instantiated, or NULL if
/// this enumeration was not instantiated from any template.
EnumDecl *getInstantiatedFromMemberEnum() const;

/// \brief If this enumeration is a member of a specialization of a
/// templated class, determine what kind of template specialization
/// or instantiation this is.
TemplateSpecializationKind getTemplateSpecializationKind() const;

/// \brief For an enumeration member that was instantiated from a member
/// enumeration of a templated class, set the template specialiation kind.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                      SourceLocation PointOfInstantiation = SourceLocation());

/// \brief If this enumeration is an instantiation of a member enumeration of
/// a class template specialization, retrieves the member specialization
/// information.
MemberSpecializationInfo *getMemberSpecializationInfo() const {
  return SpecializationInfo;
}

/// \brief Specify that this enumeration is an instantiation of the
/// member enumeration ED.
void setInstantiationOfMemberEnum(EnumDecl *ED,
                                  TemplateSpecializationKind TSK) {
  setInstantiationOfMemberEnum(getASTContext(), ED, TSK);
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Enum; }
3519};

3521/// Represents a struct/union/class.  For example:
3522///   struct X;                  // Forward declaration, no "body".
3523///   union Y { int A, B; };     // Has body with members A and B (FieldDecls).
3524/// This decl will be marked invalid if *any* members are invalid.
3525class RecordDecl : public TagDecl {
friend class DeclContext;

// FIXME: This can be packed into the bitfields in Decl.
/// This is true if this struct ends with a flexible
/// array member (e.g. int X[]) or if this union contains a struct that does.
/// If so, this cannot be contained in arrays or other structs as a member.
bool HasFlexibleArrayMember : 1;

/// Whether this is the type of an anonymous struct or union.
bool AnonymousStructOrUnion : 1;

/// This is true if this struct has at least one member
/// containing an Objective-C object pointer type.
bool HasObjectMember : 1;

/// This is true if struct has at least one member of
/// 'volatile' type.
bool HasVolatileMember : 1;

/// Whether the field declarations of this record have been loaded
/// from external storage. To avoid unnecessary deserialization of
/// methods/nested types we allow deserialization of just the fields
/// when needed.
mutable bool LoadedFieldsFromExternalStorage : 1;

/// Basic properties of non-trivial C structs.
bool NonTrivialToPrimitiveDefaultInitialize : 1;
bool NonTrivialToPrimitiveCopy : 1;
bool NonTrivialToPrimitiveDestroy : 1;

3556protected:
RecordDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
           SourceLocation StartLoc, SourceLocation IdLoc,
           IdentifierInfo *Id, RecordDecl *PrevDecl);

3561public:
static RecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC,
                          SourceLocation StartLoc, SourceLocation IdLoc,
                          IdentifierInfo *Id, RecordDecl* PrevDecl = nullptr);
static RecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID);

RecordDecl *getPreviousDecl() {
  return cast_or_null<RecordDecl>(
          static_cast<TagDecl *>(this)->getPreviousDecl());
}
const RecordDecl *getPreviousDecl() const {
  return const_cast<RecordDecl*>(this)->getPreviousDecl();
}

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

bool hasFlexibleArrayMember() const { return HasFlexibleArrayMember; }
void setHasFlexibleArrayMember(bool V) { HasFlexibleArrayMember = V; }

/// Whether this is an anonymous struct or union. To be an anonymous
/// struct or union, it must have been declared without a name and
/// there must be no objects of this type declared, e.g.,
/// @code
///   union { int i; float f; };
/// @endcode
/// is an anonymous union but neither of the following are:
/// @code
///  union X { int i; float f; };
///  union { int i; float f; } obj;
/// @endcode
bool isAnonymousStructOrUnion() const { return AnonymousStructOrUnion; }
void setAnonymousStructOrUnion(bool Anon) {
  AnonymousStructOrUnion = Anon;
}

bool hasObjectMember() const { return HasObjectMember; }
void setHasObjectMember (bool val) { HasObjectMember = val; }

bool hasVolatileMember() const { return HasVolatileMember; }
void setHasVolatileMember (bool val) { HasVolatileMember = val; }

bool hasLoadedFieldsFromExternalStorage() const {
  return LoadedFieldsFromExternalStorage;
}
void setHasLoadedFieldsFromExternalStorage(bool val) {
  LoadedFieldsFromExternalStorage = val;
}

/// Functions to query basic properties of non-trivial C structs.
bool isNonTrivialToPrimitiveDefaultInitialize() const {
  return NonTrivialToPrimitiveDefaultInitialize;
}

void setNonTrivialToPrimitiveDefaultInitialize() {
  NonTrivialToPrimitiveDefaultInitialize = true;
}

bool isNonTrivialToPrimitiveCopy() const {
  return NonTrivialToPrimitiveCopy;
}

void setNonTrivialToPrimitiveCopy() {
  NonTrivialToPrimitiveCopy = true;
}

bool isNonTrivialToPrimitiveDestroy() const {
  return NonTrivialToPrimitiveDestroy;
}

void setNonTrivialToPrimitiveDestroy() {
  NonTrivialToPrimitiveDestroy = true;
}

/// \brief Determines whether this declaration represents the
/// injected class name.
///
/// The injected class name in C++ is the name of the class that
/// appears inside the class itself. For example:
///
/// \code
/// struct C {
///   // C is implicitly declared here as a synonym for the class name.
/// };
///
/// C::C c; // same as "C c;"
/// \endcode
bool isInjectedClassName() const;

/// \brief Determine whether this record is a class describing a lambda
/// function object.
bool isLambda() const;

/// \brief Determine whether this record is a record for captured variables in
/// CapturedStmt construct.
bool isCapturedRecord() const;

/// \brief Mark the record as a record for captured variables in CapturedStmt
/// construct.
void setCapturedRecord();

/// Returns the RecordDecl that actually defines
///  this struct/union/class.  When determining whether or not a
///  struct/union/class is completely defined, one should use this
///  method as opposed to 'isCompleteDefinition'.
///  'isCompleteDefinition' indicates whether or not a specific
///  RecordDecl is a completed definition, not whether or not the
///  record type is defined.  This method returns NULL if there is
///  no RecordDecl that defines the struct/union/tag.
RecordDecl *getDefinition() const {
  return cast_or_null<RecordDecl>(TagDecl::getDefinition());
}

// Iterator access to field members. The field iterator only visits
// the non-static data members of this class, ignoring any static
// data members, functions, constructors, destructors, etc.
using field_iterator = specific_decl_iterator<FieldDecl>;
using field_range = llvm::iterator_range<specific_decl_iterator<FieldDecl>>;

field_range fields() const { return field_range(field_begin(), field_end()); }
field_iterator field_begin() const;

field_iterator field_end() const {
  return field_iterator(decl_iterator());
}

// Whether there are any fields (non-static data members) in this record.
bool field_empty() const {
  return field_begin() == field_end();
}

/// Note that the definition of this type is now complete.
virtual void completeDefinition();

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

/// \brief Get whether or not this is an ms_struct which can
/// be turned on with an attribute, pragma, or -mms-bitfields
/// commandline option.
bool isMsStruct(const ASTContext &C) const;

/// \brief Whether we are allowed to insert extra padding between fields.
/// These padding are added to help AddressSanitizer detect
/// intra-object-overflow bugs.
bool mayInsertExtraPadding(bool EmitRemark = false) const;

/// Finds the first data member which has a name.
/// nullptr is returned if no named data member exists.
const FieldDecl *findFirstNamedDataMember() const;  

3718private:
/// \brief Deserialize just the fields.
void LoadFieldsFromExternalStorage() const;
3721};

3723class FileScopeAsmDecl : public Decl {
StringLiteral *AsmString;
SourceLocation RParenLoc;

FileScopeAsmDecl(DeclContext *DC, StringLiteral *asmstring,
                 SourceLocation StartL, SourceLocation EndL)
  : Decl(FileScopeAsm, DC, StartL), AsmString(asmstring), RParenLoc(EndL) {}

virtual void anchor();

3733public:
static FileScopeAsmDecl *Create(ASTContext &C, DeclContext *DC,
                                StringLiteral *Str, SourceLocation AsmLoc,
                                SourceLocation RParenLoc);

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

SourceLocation getAsmLoc() const { return getLocation(); }
SourceLocation getRParenLoc() const { return RParenLoc; }
void setRParenLoc(SourceLocation L) { RParenLoc = L; }
SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(getAsmLoc(), getRParenLoc());
}

const StringLiteral *getAsmString() const { return AsmString; }
StringLiteral *getAsmString() { return AsmString; }
void setAsmString(StringLiteral *Asm) { AsmString = Asm; }

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == FileScopeAsm; }
3753};

3755/// Pepresents a block literal declaration, which is like an
3756/// unnamed FunctionDecl.  For example:
3757/// ^{ statement-body }   or   ^(int arg1, float arg2){ statement-body }
3758class BlockDecl : public Decl, public DeclContext {
3759public:
/// A class which contains all the information about a particular
/// captured value.
class Capture {
  enum {
    flag_isByRef = 0x1,
    flag_isNested = 0x2
  };

  /// The variable being captured.
  llvm::PointerIntPair<VarDecl*, 2> VariableAndFlags;

  /// The copy expression, expressed in terms of a DeclRef (or
  /// BlockDeclRef) to the captured variable.  Only required if the
  /// variable has a C++ class type.
  Expr *CopyExpr;

public:
  Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy)
    : VariableAndFlags(variable,
                (byRef ? flag_isByRef : 0) | (nested ? flag_isNested : 0)),
      CopyExpr(copy) {}

  /// The variable being captured.
  VarDecl *getVariable() const { return VariableAndFlags.getPointer(); }

  /// Whether this is a "by ref" capture, i.e. a capture of a __block
  /// variable.
  bool isByRef() const { return VariableAndFlags.getInt() & flag_isByRef; }

  /// Whether this is a nested capture, i.e. the variable captured
  /// is not from outside the immediately enclosing function/block.
  bool isNested() const { return VariableAndFlags.getInt() & flag_isNested; }

  bool hasCopyExpr() const { return CopyExpr != nullptr; }
  Expr *getCopyExpr() const { return CopyExpr; }
  void setCopyExpr(Expr *e) { CopyExpr = e; }
};

3798private:
// FIXME: This can be packed into the bitfields in Decl.
bool IsVariadic : 1;
bool CapturesCXXThis : 1;
bool BlockMissingReturnType : 1;
bool IsConversionFromLambda : 1;

/// A new[]'d array of pointers to ParmVarDecls for the formal
/// parameters of this function.  This is null if a prototype or if there are
/// no formals.
ParmVarDecl **ParamInfo = nullptr;
unsigned NumParams = 0;

Stmt *Body = nullptr;
TypeSourceInfo *SignatureAsWritten = nullptr;

const Capture *Captures = nullptr;
unsigned NumCaptures = 0;

unsigned ManglingNumber = 0;
Decl *ManglingContextDecl = nullptr;

3820protected:
BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
    : Decl(Block, DC, CaretLoc), DeclContext(Block), IsVariadic(false),
      CapturesCXXThis(false), BlockMissingReturnType(true),
      IsConversionFromLambda(false) {}

3826public:
static BlockDecl *Create(ASTContext &C, DeclContext *DC, SourceLocation L); 
static BlockDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceLocation getCaretLocation() const { return getLocation(); }

bool isVariadic() const { return IsVariadic; }
void setIsVariadic(bool value) { IsVariadic = value; }

CompoundStmt *getCompoundBody() const { return (CompoundStmt*) Body; }
Stmt *getBody() const override { return (Stmt*) Body; }
void setBody(CompoundStmt *B) { Body = (Stmt*) B; }

void setSignatureAsWritten(TypeSourceInfo *Sig) { SignatureAsWritten = Sig; }
TypeSourceInfo *getSignatureAsWritten() const { return SignatureAsWritten; }

// ArrayRef access to formal parameters.
ArrayRef<ParmVarDecl *> parameters() const {
  return {ParamInfo, getNumParams()};
}
MutableArrayRef<ParmVarDecl *> parameters() {
  return {ParamInfo, getNumParams()};
}

// Iterator access to formal parameters.
using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator;
using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator;

bool param_empty() const { return parameters().empty(); }
param_iterator param_begin() { return parameters().begin(); }
param_iterator param_end() { return parameters().end(); }
param_const_iterator param_begin() const { return parameters().begin(); }
param_const_iterator param_end() const { return parameters().end(); }
size_t param_size() const { return parameters().size(); }

unsigned getNumParams() const { return NumParams; }

const ParmVarDecl *getParamDecl(unsigned i) const {
  assert(i < getNumParams() && "Illegal param #")(static_cast <bool> (i < getNumParams() && "Illegal param #"
) ? void (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3864, __extension__ __PRETTY_FUNCTION__));
  return ParamInfo[i];
}
ParmVarDecl *getParamDecl(unsigned i) {
  assert(i < getNumParams() && "Illegal param #")(static_cast <bool> (i < getNumParams() && "Illegal param #"
) ? void (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3868, __extension__ __PRETTY_FUNCTION__));
  return ParamInfo[i];
}

void setParams(ArrayRef<ParmVarDecl *> NewParamInfo);

/// True if this block (or its nested blocks) captures
/// anything of local storage from its enclosing scopes.
bool hasCaptures() const { return NumCaptures != 0 || CapturesCXXThis; }

/// Returns the number of captured variables.
/// Does not include an entry for 'this'.
unsigned getNumCaptures() const { return NumCaptures; }

using capture_const_iterator = ArrayRef<Capture>::const_iterator;

ArrayRef<Capture> captures() const { return {Captures, NumCaptures}; }

capture_const_iterator capture_begin() const { return captures().begin(); }
capture_const_iterator capture_end() const { return captures().end(); }

bool capturesCXXThis() const { return CapturesCXXThis; }
bool blockMissingReturnType() const { return BlockMissingReturnType; }
void setBlockMissingReturnType(bool val) { BlockMissingReturnType = val; }

bool isConversionFromLambda() const { return IsConversionFromLambda; }
void setIsConversionFromLambda(bool val) { IsConversionFromLambda = val; }

bool capturesVariable(const VarDecl *var) const;

void setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
                 bool CapturesCXXThis);

 unsigned getBlockManglingNumber() const {
   return ManglingNumber;
 }

 Decl *getBlockManglingContextDecl() const {
   return ManglingContextDecl;    
 }

void setBlockMangling(unsigned Number, Decl *Ctx) {
  ManglingNumber = Number;
  ManglingContextDecl = Ctx;
}

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

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Block; }
static DeclContext *castToDeclContext(const BlockDecl *D) {
  return static_cast<DeclContext *>(const_cast<BlockDecl*>(D));
}
static BlockDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<BlockDecl *>(const_cast<DeclContext*>(DC));
}
3925};

3927/// Represents the body of a CapturedStmt, and serves as its DeclContext.
3928class CapturedDecl final
  : public Decl,
    public DeclContext,
    private llvm::TrailingObjects<CapturedDecl, ImplicitParamDecl *> {
3932protected:
size_t numTrailingObjects(OverloadToken<ImplicitParamDecl>) {
  return NumParams;
}

3937private:
/// \brief The number of parameters to the outlined function.
unsigned NumParams;

/// \brief The position of context parameter in list of parameters.
unsigned ContextParam;

/// \brief The body of the outlined function.
llvm::PointerIntPair<Stmt *, 1, bool> BodyAndNothrow;

explicit CapturedDecl(DeclContext *DC, unsigned NumParams);

ImplicitParamDecl *const *getParams() const {
  return getTrailingObjects<ImplicitParamDecl *>();
}

ImplicitParamDecl **getParams() {
  return getTrailingObjects<ImplicitParamDecl *>();
}

3957public:
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

static CapturedDecl *Create(ASTContext &C, DeclContext *DC,
                            unsigned NumParams);
static CapturedDecl *CreateDeserialized(ASTContext &C, unsigned ID,
                                        unsigned NumParams);

Stmt *getBody() const override;
void setBody(Stmt *B);

bool isNothrow() const;
void setNothrow(bool Nothrow = true);

unsigned getNumParams() const { return NumParams; }

ImplicitParamDecl *getParam(unsigned i) const {
  assert(i < NumParams)(static_cast <bool> (i < NumParams) ? void (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3976, __extension__ __PRETTY_FUNCTION__));
  return getParams()[i];
}
void setParam(unsigned i, ImplicitParamDecl *P) {
  assert(i < NumParams)(static_cast <bool> (i < NumParams) ? void (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3980, __extension__ __PRETTY_FUNCTION__));
  getParams()[i] = P;
}

// ArrayRef interface to parameters.
ArrayRef<ImplicitParamDecl *> parameters() const {
  return {getParams(), getNumParams()};
}
MutableArrayRef<ImplicitParamDecl *> parameters() {
  return {getParams(), getNumParams()};
}

/// \brief Retrieve the parameter containing captured variables.
ImplicitParamDecl *getContextParam() const {
  assert(ContextParam < NumParams)(static_cast <bool> (ContextParam < NumParams) ? void
 (0) : __assert_fail ("ContextParam < NumParams", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3994, __extension__ __PRETTY_FUNCTION__));
  return getParam(ContextParam);
}
void setContextParam(unsigned i, ImplicitParamDecl *P) {
  assert(i < NumParams)(static_cast <bool> (i < NumParams) ? void (0) : __assert_fail
 ("i < NumParams", "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 3998, __extension__ __PRETTY_FUNCTION__));
  ContextParam = i;
  setParam(i, P);
}
unsigned getContextParamPosition() const { return ContextParam; }

using param_iterator = ImplicitParamDecl *const *;
using param_range = llvm::iterator_range<param_iterator>;

/// \brief Retrieve an iterator pointing to the first parameter decl.
param_iterator param_begin() const { return getParams(); }
/// \brief Retrieve an iterator one past the last parameter decl.
param_iterator param_end() const { return getParams() + NumParams; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Captured; }
static DeclContext *castToDeclContext(const CapturedDecl *D) {
  return static_cast<DeclContext *>(const_cast<CapturedDecl *>(D));
}
static CapturedDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<CapturedDecl *>(const_cast<DeclContext *>(DC));
}
4021};

4023/// \brief Describes a module import declaration, which makes the contents
4024/// of the named module visible in the current translation unit.
4025///
4026/// An import declaration imports the named module (or submodule). For example:
4027/// \code
4028///   @import std.vector;
4029/// \endcode
4030///
4031/// Import declarations can also be implicitly generated from
4032/// \#include/\#import directives.
4033class ImportDecl final : public Decl,
                       llvm::TrailingObjects<ImportDecl, SourceLocation> {
friend class ASTContext;
friend class ASTDeclReader;
friend class ASTReader;
friend TrailingObjects;

/// \brief The imported module, along with a bit that indicates whether
/// we have source-location information for each identifier in the module
/// name. 
///
/// When the bit is false, we only have a single source location for the
/// end of the import declaration.
llvm::PointerIntPair<Module *, 1, bool> ImportedAndComplete;

/// \brief The next import in the list of imports local to the translation
/// unit being parsed (not loaded from an AST file).
ImportDecl *NextLocalImport = nullptr;

ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported,
           ArrayRef<SourceLocation> IdentifierLocs);

ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported,
           SourceLocation EndLoc);

ImportDecl(EmptyShell Empty) : Decl(Import, Empty) {}

4060public:
/// \brief Create a new module import declaration.
static ImportDecl *Create(ASTContext &C, DeclContext *DC, 
                          SourceLocation StartLoc, Module *Imported,
                          ArrayRef<SourceLocation> IdentifierLocs);

/// \brief Create a new module import declaration for an implicitly-generated
/// import.
static ImportDecl *CreateImplicit(ASTContext &C, DeclContext *DC, 
                                  SourceLocation StartLoc, Module *Imported, 
                                  SourceLocation EndLoc);

/// \brief Create a new, deserialized module import declaration.
static ImportDecl *CreateDeserialized(ASTContext &C, unsigned ID, 
                                      unsigned NumLocations);

/// \brief Retrieve the module that was imported by the import declaration.
Module *getImportedModule() const { return ImportedAndComplete.getPointer(); }

/// \brief Retrieves the locations of each of the identifiers that make up
/// the complete module name in the import declaration.
///
/// This will return an empty array if the locations of the individual
/// identifiers aren't available.
ArrayRef<SourceLocation> getIdentifierLocs() const;

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

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Import; }
4090};

4092/// \brief Represents a C++ Modules TS module export declaration.
4093///
4094/// For example:
4095/// \code
4096///   export void foo();
4097/// \endcode
4098class ExportDecl final : public Decl, public DeclContext {
virtual void anchor();

4101private:
friend class ASTDeclReader;

/// \brief The source location for the right brace (if valid).
SourceLocation RBraceLoc;

ExportDecl(DeclContext *DC, SourceLocation ExportLoc)
    : Decl(Export, DC, ExportLoc), DeclContext(Export),
      RBraceLoc(SourceLocation()) {}

4111public:
static ExportDecl *Create(ASTContext &C, DeclContext *DC,
                          SourceLocation ExportLoc);
static ExportDecl *CreateDeserialized(ASTContext &C, unsigned ID);

SourceLocation getExportLoc() const { return getLocation(); }
SourceLocation getRBraceLoc() const { return RBraceLoc; }
void setRBraceLoc(SourceLocation L) { RBraceLoc = L; }

SourceLocation getLocEnd() const LLVM_READONLY__attribute__((__pure__)) {
  if (RBraceLoc.isValid())
    return RBraceLoc;
  // No braces: get the end location of the (only) declaration in context
  // (if present).
  return decls_empty() ? getLocation() : decls_begin()->getLocEnd();
}

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

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Export; }
static DeclContext *castToDeclContext(const ExportDecl *D) {
  return static_cast<DeclContext *>(const_cast<ExportDecl*>(D));
}
static ExportDecl *castFromDeclContext(const DeclContext *DC) {
  return static_cast<ExportDecl *>(const_cast<DeclContext*>(DC));
}
4140};

4142/// Represents an empty-declaration.
4143class EmptyDecl : public Decl {
EmptyDecl(DeclContext *DC, SourceLocation L) : Decl(Empty, DC, L) {}

virtual void anchor();

4148public:
static EmptyDecl *Create(ASTContext &C, DeclContext *DC,
                         SourceLocation L);
static EmptyDecl *CreateDeserialized(ASTContext &C, unsigned ID);

static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Empty; }
4155};

4157/// Insertion operator for diagnostics.  This allows sending NamedDecl's
4158/// into a diagnostic with <<.
4159inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         const NamedDecl* ND) {
DB.AddTaggedVal(reinterpret_cast<intptr_t>(ND),
                DiagnosticsEngine::ak_nameddecl);
return DB;
4164}
4165inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                         const NamedDecl* ND) {
PD.AddTaggedVal(reinterpret_cast<intptr_t>(ND),
16
←
Calling 'PartialDiagnostic::AddTaggedVal'→
25
←
Returned allocated memory→
                DiagnosticsEngine::ak_nameddecl);
return PD;
4170}

4172template<typename decl_type>
4173void Redeclarable<decl_type>::setPreviousDecl(decl_type *PrevDecl) {
// Note: This routine is implemented here because we need both NamedDecl
// and Redeclarable to be defined.
assert(RedeclLink.NextIsLatest() &&(static_cast <bool> (RedeclLink.NextIsLatest() &&
 "setPreviousDecl on a decl already in a redeclaration chain"
) ? void (0) : __assert_fail ("RedeclLink.NextIsLatest() && \"setPreviousDecl on a decl already in a redeclaration chain\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 4177, __extension__ __PRETTY_FUNCTION__))
       "setPreviousDecl on a decl already in a redeclaration chain")(static_cast <bool> (RedeclLink.NextIsLatest() &&
 "setPreviousDecl on a decl already in a redeclaration chain"
) ? void (0) : __assert_fail ("RedeclLink.NextIsLatest() && \"setPreviousDecl on a decl already in a redeclaration chain\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 4177, __extension__ __PRETTY_FUNCTION__));

if (PrevDecl) {
  // Point to previous. Make sure that this is actually the most recent
  // redeclaration, or we can build invalid chains. If the most recent
  // redeclaration is invalid, it won't be PrevDecl, but we want it anyway.
  First = PrevDecl->getFirstDecl();
  assert(First->RedeclLink.NextIsLatest() && "Expected first")(static_cast <bool> (First->RedeclLink.NextIsLatest(
) && "Expected first") ? void (0) : __assert_fail ("First->RedeclLink.NextIsLatest() && \"Expected first\""
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 4184, __extension__ __PRETTY_FUNCTION__));
  decl_type *MostRecent = First->getNextRedeclaration();
  RedeclLink = PreviousDeclLink(cast<decl_type>(MostRecent));

  // If the declaration was previously visible, a redeclaration of it remains
  // visible even if it wouldn't be visible by itself.
  static_cast<decl_type*>(this)->IdentifierNamespace |=
    MostRecent->getIdentifierNamespace() &
    (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type);
} else {
  // Make this first.
  First = static_cast<decl_type*>(this);
}

// First one will point to this one as latest.
First->RedeclLink.setLatest(static_cast<decl_type*>(this));

assert(!isa<NamedDecl>(static_cast<decl_type*>(this)) ||(static_cast <bool> (!isa<NamedDecl>(static_cast<
decl_type*>(this)) || cast<NamedDecl>(static_cast<
decl_type*>(this))->isLinkageValid()) ? void (0) : __assert_fail
 ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 4202, __extension__ __PRETTY_FUNCTION__))
       cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid())(static_cast <bool> (!isa<NamedDecl>(static_cast<
decl_type*>(this)) || cast<NamedDecl>(static_cast<
decl_type*>(this))->isLinkageValid()) ? void (0) : __assert_fail
 ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()"
, "/build/llvm-toolchain-snapshot-7~svn326425/tools/clang/include/clang/AST/Decl.h"
, 4202, __extension__ __PRETTY_FUNCTION__));
4203}

4205// Inline function definitions.

4207/// Check if the given decl is complete.
4208///
4209/// We use this function to break a cycle between the inline definitions in
4210/// Type.h and Decl.h.
4211inline bool IsEnumDeclComplete(EnumDecl *ED) {
return ED->isComplete();
4213}

4215/// Check if the given decl is scoped.
4216///
4217/// We use this function to break a cycle between the inline definitions in
4218/// Type.h and Decl.h.
4219inline bool IsEnumDeclScoped(EnumDecl *ED) {
return ED->isScoped();
4221}

4223} // namespace clang

4225#endif // LLVM_CLANG_AST_DECL_H

←

/build/llvm-toolchain-snapshot-7~svn326425/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/LLVM.h"
21#include "clang/Basic/SourceLocation.h"
22#include "llvm/ADT/SmallVector.h"
23#include "llvm/ADT/StringRef.h"
24#include <cassert>
25#include <cstdint>
26#include <string>
27#include <type_traits>
28#include <utility>

30namespace clang {

32class DeclContext;
33class IdentifierInfo;

35class PartialDiagnostic {
36public:
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 {
  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 = 0;

  /// \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;

  Storage() = default;
};

/// \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;
  }
};

118private:
// 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 = 0;

/// \brief Storage for args and ranges.
mutable Storage *DiagStorage = nullptr;

/// \brief Allocator used to allocate storage for this diagnostic.
StorageAllocator *Allocator = nullptr;

/// \brief Retrieve storage for this particular diagnostic.
Storage *getStorage() const {
  if (DiagStorage)
20
←
Taking false branch→
    return DiagStorage;

  if (Allocator)
21
←
Assuming the condition is false→
22
←
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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 140, __extension__ __PRETTY_FUNCTION__));
    DiagStorage = new Storage;
23
←
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);
}

184public:
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) {}

PartialDiagnostic(unsigned DiagID, StorageAllocator &Allocator)
    : DiagID(DiagID), Allocator(&Allocator) {}

PartialDiagnostic(const PartialDiagnostic &Other)
    : DiagID(Other.DiagID), 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()), 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)
17
←
Assuming the condition is true→
18
←
Taking true branch→
    DiagStorage = getStorage();
19
←
Calling 'PartialDiagnostic::getStorage'→
24
←
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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 338, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 339, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __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~svn326425/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __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);
  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;
}
409};

411inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         const PartialDiagnostic &PD) {
PD.Emit(DB);
return DB;
415}

417/// \brief A partial diagnostic along with the source location where this
418/// diagnostic occurs.
419using PartialDiagnosticAt = std::pair<SourceLocation, PartialDiagnostic>;

421} // namespace clang

423#endif // LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H