/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp

Bug Summary

File:	tools/clang/lib/Sema/SemaExprCXX.cpp
Warning:	line 706, column 7 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 SemaExprCXX.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~svn326551/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326551/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~svn326551/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-2018-03-02-155150-1477-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp

/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp

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1//===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
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 semantic analysis for C++ expressions.
12///
13//===----------------------------------------------------------------------===//

15#include "clang/Sema/SemaInternal.h"
16#include "TreeTransform.h"
17#include "TypeLocBuilder.h"
18#include "clang/AST/ASTContext.h"
19#include "clang/AST/ASTLambda.h"
20#include "clang/AST/CXXInheritance.h"
21#include "clang/AST/CharUnits.h"
22#include "clang/AST/DeclObjC.h"
23#include "clang/AST/ExprCXX.h"
24#include "clang/AST/ExprObjC.h"
25#include "clang/AST/RecursiveASTVisitor.h"
26#include "clang/AST/TypeLoc.h"
27#include "clang/Basic/AlignedAllocation.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/TargetInfo.h"
30#include "clang/Lex/Preprocessor.h"
31#include "clang/Sema/DeclSpec.h"
32#include "clang/Sema/Initialization.h"
33#include "clang/Sema/Lookup.h"
34#include "clang/Sema/ParsedTemplate.h"
35#include "clang/Sema/Scope.h"
36#include "clang/Sema/ScopeInfo.h"
37#include "clang/Sema/SemaLambda.h"
38#include "clang/Sema/TemplateDeduction.h"
39#include "llvm/ADT/APInt.h"
40#include "llvm/ADT/STLExtras.h"
41#include "llvm/Support/ErrorHandling.h"
42using namespace clang;
43using namespace sema;

45/// \brief Handle the result of the special case name lookup for inheriting
46/// constructor declarations. 'NS::X::X' and 'NS::X<...>::X' are treated as
47/// constructor names in member using declarations, even if 'X' is not the
48/// name of the corresponding type.
49ParsedType Sema::getInheritingConstructorName(CXXScopeSpec &SS,
                                            SourceLocation NameLoc,
                                            IdentifierInfo &Name) {
NestedNameSpecifier *NNS = SS.getScopeRep();

// Convert the nested-name-specifier into a type.
QualType Type;
switch (NNS->getKind()) {
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
  Type = QualType(NNS->getAsType(), 0);
  break;

case NestedNameSpecifier::Identifier:
  // Strip off the last layer of the nested-name-specifier and build a
  // typename type for it.
  assert(NNS->getAsIdentifier() == &Name && "not a constructor name")(static_cast <bool> (NNS->getAsIdentifier() == &
Name && "not a constructor name") ? void (0) : __assert_fail
 ("NNS->getAsIdentifier() == &Name && \"not a constructor name\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 65, __extension__ __PRETTY_FUNCTION__));
  Type = Context.getDependentNameType(ETK_None, NNS->getPrefix(),
                                      NNS->getAsIdentifier());
  break;

case NestedNameSpecifier::Global:
case NestedNameSpecifier::Super:
case NestedNameSpecifier::Namespace:
case NestedNameSpecifier::NamespaceAlias:
  llvm_unreachable("Nested name specifier is not a type for inheriting ctor")::llvm::llvm_unreachable_internal("Nested name specifier is not a type for inheriting ctor"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 74);
}

// This reference to the type is located entirely at the location of the
// final identifier in the qualified-id.
return CreateParsedType(Type,
                        Context.getTrivialTypeSourceInfo(Type, NameLoc));
81}

83ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
                                 IdentifierInfo &II,
                                 SourceLocation NameLoc,
                                 Scope *S, CXXScopeSpec &SS,
                                 ParsedType ObjectTypePtr,
                                 bool EnteringContext) {
// Determine where to perform name lookup.

// FIXME: This area of the standard is very messy, and the current
// wording is rather unclear about which scopes we search for the
// destructor name; see core issues 399 and 555. Issue 399 in
// particular shows where the current description of destructor name
// lookup is completely out of line with existing practice, e.g.,
// this appears to be ill-formed:
//
//   namespace N {
//     template <typename T> struct S {
//       ~S();
//     };
//   }
//
//   void f(N::S<int>* s) {
//     s->N::S<int>::~S();
//   }
//
// See also PR6358 and PR6359.
// For this reason, we're currently only doing the C++03 version of this
// code; the C++0x version has to wait until we get a proper spec.
QualType SearchType;
DeclContext *LookupCtx = nullptr;
bool isDependent = false;
bool LookInScope = false;

if (SS.isInvalid())
  return nullptr;

// If we have an object type, it's because we are in a
// pseudo-destructor-expression or a member access expression, and
// we know what type we're looking for.
if (ObjectTypePtr)
  SearchType = GetTypeFromParser(ObjectTypePtr);

if (SS.isSet()) {
  NestedNameSpecifier *NNS = SS.getScopeRep();

  bool AlreadySearched = false;
  bool LookAtPrefix = true;
  // C++11 [basic.lookup.qual]p6:
  //   If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier,
  //   the type-names are looked up as types in the scope designated by the
  //   nested-name-specifier. Similarly, in a qualified-id of the form:
  //
  //     nested-name-specifier[opt] class-name :: ~ class-name
  //
  //   the second class-name is looked up in the same scope as the first.
  //
  // Here, we determine whether the code below is permitted to look at the
  // prefix of the nested-name-specifier.
  DeclContext *DC = computeDeclContext(SS, EnteringContext);
  if (DC && DC->isFileContext()) {
    AlreadySearched = true;
    LookupCtx = DC;
    isDependent = false;
  } else if (DC && isa<CXXRecordDecl>(DC)) {
    LookAtPrefix = false;
    LookInScope = true;
  }

  // The second case from the C++03 rules quoted further above.
  NestedNameSpecifier *Prefix = nullptr;
  if (AlreadySearched) {
    // Nothing left to do.
  } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
    CXXScopeSpec PrefixSS;
    PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
    LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
    isDependent = isDependentScopeSpecifier(PrefixSS);
  } else if (ObjectTypePtr) {
    LookupCtx = computeDeclContext(SearchType);
    isDependent = SearchType->isDependentType();
  } else {
    LookupCtx = computeDeclContext(SS, EnteringContext);
    isDependent = LookupCtx && LookupCtx->isDependentContext();
  }
} else if (ObjectTypePtr) {
  // C++ [basic.lookup.classref]p3:
  //   If the unqualified-id is ~type-name, the type-name is looked up
  //   in the context of the entire postfix-expression. If the type T
  //   of the object expression is of a class type C, the type-name is
  //   also looked up in the scope of class C. At least one of the
  //   lookups shall find a name that refers to (possibly
  //   cv-qualified) T.
  LookupCtx = computeDeclContext(SearchType);
  isDependent = SearchType->isDependentType();
  assert((isDependent || !SearchType->isIncompleteType()) &&(static_cast <bool> ((isDependent || !SearchType->isIncompleteType
()) && "Caller should have completed object type") ? void
 (0) : __assert_fail ("(isDependent || !SearchType->isIncompleteType()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 178, __extension__ __PRETTY_FUNCTION__))
         "Caller should have completed object type")(static_cast <bool> ((isDependent || !SearchType->isIncompleteType
()) && "Caller should have completed object type") ? void
 (0) : __assert_fail ("(isDependent || !SearchType->isIncompleteType()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 178, __extension__ __PRETTY_FUNCTION__));

  LookInScope = true;
} else {
  // Perform lookup into the current scope (only).
  LookInScope = true;
}

TypeDecl *NonMatchingTypeDecl = nullptr;
LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName);
for (unsigned Step = 0; Step != 2; ++Step) {
  // Look for the name first in the computed lookup context (if we
  // have one) and, if that fails to find a match, in the scope (if
  // we're allowed to look there).
  Found.clear();
  if (Step == 0 && LookupCtx) {
    if (RequireCompleteDeclContext(SS, LookupCtx))
      return nullptr;
    LookupQualifiedName(Found, LookupCtx);
  } else if (Step == 1 && LookInScope && S) {
    LookupName(Found, S);
  } else {
    continue;
  }

  // FIXME: Should we be suppressing ambiguities here?
  if (Found.isAmbiguous())
    return nullptr;

  if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) {
    QualType T = Context.getTypeDeclType(Type);
    MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false);

    if (SearchType.isNull() || SearchType->isDependentType() ||
        Context.hasSameUnqualifiedType(T, SearchType)) {
      // We found our type!

      return CreateParsedType(T,
                              Context.getTrivialTypeSourceInfo(T, NameLoc));
    }

    if (!SearchType.isNull())
      NonMatchingTypeDecl = Type;
  }

  // If the name that we found is a class template name, and it is
  // the same name as the template name in the last part of the
  // nested-name-specifier (if present) or the object type, then
  // this is the destructor for that class.
  // FIXME: This is a workaround until we get real drafting for core
  // issue 399, for which there isn't even an obvious direction.
  if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) {
    QualType MemberOfType;
    if (SS.isSet()) {
      if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) {
        // Figure out the type of the context, if it has one.
        if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx))
          MemberOfType = Context.getTypeDeclType(Record);
      }
    }
    if (MemberOfType.isNull())
      MemberOfType = SearchType;

    if (MemberOfType.isNull())
      continue;

    // We're referring into a class template specialization. If the
    // class template we found is the same as the template being
    // specialized, we found what we are looking for.
    if (const RecordType *Record = MemberOfType->getAs<RecordType>()) {
      if (ClassTemplateSpecializationDecl *Spec
            = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
        if (Spec->getSpecializedTemplate()->getCanonicalDecl() ==
              Template->getCanonicalDecl())
          return CreateParsedType(
              MemberOfType,
              Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));
      }

      continue;
    }

    // We're referring to an unresolved class template
    // specialization. Determine whether we class template we found
    // is the same as the template being specialized or, if we don't
    // know which template is being specialized, that it at least
    // has the same name.
    if (const TemplateSpecializationType *SpecType
          = MemberOfType->getAs<TemplateSpecializationType>()) {
      TemplateName SpecName = SpecType->getTemplateName();

      // The class template we found is the same template being
      // specialized.
      if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) {
        if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl())
          return CreateParsedType(
              MemberOfType,
              Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));

        continue;
      }

      // The class template we found has the same name as the
      // (dependent) template name being specialized.
      if (DependentTemplateName *DepTemplate
                                  = SpecName.getAsDependentTemplateName()) {
        if (DepTemplate->isIdentifier() &&
            DepTemplate->getIdentifier() == Template->getIdentifier())
          return CreateParsedType(
              MemberOfType,
              Context.getTrivialTypeSourceInfo(MemberOfType, NameLoc));

        continue;
      }
    }
  }
}

if (isDependent) {
  // We didn't find our type, but that's okay: it's dependent
  // anyway.

  // FIXME: What if we have no nested-name-specifier?
  QualType T = CheckTypenameType(ETK_None, SourceLocation(),
                                 SS.getWithLocInContext(Context),
                                 II, NameLoc);
  return ParsedType::make(T);
}

if (NonMatchingTypeDecl) {
  QualType T = Context.getTypeDeclType(NonMatchingTypeDecl);
  Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
    << T << SearchType;
  Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here)
    << T;
} else if (ObjectTypePtr)
  Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
    << &II;
else {
  SemaDiagnosticBuilder DtorDiag = Diag(NameLoc,
                                        diag::err_destructor_class_name);
  if (S) {
    const DeclContext *Ctx = S->getEntity();
    if (const CXXRecordDecl *Class = dyn_cast_or_null<CXXRecordDecl>(Ctx))
      DtorDiag << FixItHint::CreateReplacement(SourceRange(NameLoc),
                                               Class->getNameAsString());
  }
}

return nullptr;
328}

330ParsedType Sema::getDestructorTypeForDecltype(const DeclSpec &DS,
                                            ParsedType ObjectType) {
if (DS.getTypeSpecType() == DeclSpec::TST_error)
  return nullptr;

if (DS.getTypeSpecType() == DeclSpec::TST_decltype_auto) {
  Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid);
  return nullptr;
}

assert(DS.getTypeSpecType() == DeclSpec::TST_decltype &&(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_decltype && "unexpected type in getDestructorType"
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_decltype && \"unexpected type in getDestructorType\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 341, __extension__ __PRETTY_FUNCTION__))
       "unexpected type in getDestructorType")(static_cast <bool> (DS.getTypeSpecType() == DeclSpec::
TST_decltype && "unexpected type in getDestructorType"
) ? void (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_decltype && \"unexpected type in getDestructorType\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 341, __extension__ __PRETTY_FUNCTION__));
QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc());

// If we know the type of the object, check that the correct destructor
// type was named now; we can give better diagnostics this way.
QualType SearchType = GetTypeFromParser(ObjectType);
if (!SearchType.isNull() && !SearchType->isDependentType() &&
    !Context.hasSameUnqualifiedType(T, SearchType)) {
  Diag(DS.getTypeSpecTypeLoc(), diag::err_destructor_expr_type_mismatch)
    << T << SearchType;
  return nullptr;
}

return ParsedType::make(T);
355}

357bool Sema::checkLiteralOperatorId(const CXXScopeSpec &SS,
                                const UnqualifiedId &Name) {
assert(Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId)(static_cast <bool> (Name.getKind() == UnqualifiedIdKind
::IK_LiteralOperatorId) ? void (0) : __assert_fail ("Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 359, __extension__ __PRETTY_FUNCTION__));

if (!SS.isValid())
  return false;

switch (SS.getScopeRep()->getKind()) {
case NestedNameSpecifier::Identifier:
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
  // Per C++11 [over.literal]p2, literal operators can only be declared at
  // namespace scope. Therefore, this unqualified-id cannot name anything.
  // Reject it early, because we have no AST representation for this in the
  // case where the scope is dependent.
  Diag(Name.getLocStart(), diag::err_literal_operator_id_outside_namespace)
    << SS.getScopeRep();
  return true;

case NestedNameSpecifier::Global:
case NestedNameSpecifier::Super:
case NestedNameSpecifier::Namespace:
case NestedNameSpecifier::NamespaceAlias:
  return false;
}

llvm_unreachable("unknown nested name specifier kind")::llvm::llvm_unreachable_internal("unknown nested name specifier kind"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 383);
384}

386/// \brief Build a C++ typeid expression with a type operand.
387ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
                              SourceLocation TypeidLoc,
                              TypeSourceInfo *Operand,
                              SourceLocation RParenLoc) {
// C++ [expr.typeid]p4:
//   The top-level cv-qualifiers of the lvalue expression or the type-id
//   that is the operand of typeid are always ignored.
//   If the type of the type-id is a class type or a reference to a class
//   type, the class shall be completely-defined.
Qualifiers Quals;
QualType T
  = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(),
                                    Quals);
if (T->getAs<RecordType>() &&
    RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
  return ExprError();

if (T->isVariablyModifiedType())
  return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid) << T);

return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), Operand,
                                   SourceRange(TypeidLoc, RParenLoc));
409}

411/// \brief Build a C++ typeid expression with an expression operand.
412ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
                              SourceLocation TypeidLoc,
                              Expr *E,
                              SourceLocation RParenLoc) {
bool WasEvaluated = false;
if (E && !E->isTypeDependent()) {
  if (E->getType()->isPlaceholderType()) {
    ExprResult result = CheckPlaceholderExpr(E);
    if (result.isInvalid()) return ExprError();
    E = result.get();
  }

  QualType T = E->getType();
  if (const RecordType *RecordT = T->getAs<RecordType>()) {
    CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
    // C++ [expr.typeid]p3:
    //   [...] If the type of the expression is a class type, the class
    //   shall be completely-defined.
    if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid))
      return ExprError();

    // C++ [expr.typeid]p3:
    //   When typeid is applied to an expression other than an glvalue of a
    //   polymorphic class type [...] [the] expression is an unevaluated
    //   operand. [...]
    if (RecordD->isPolymorphic() && E->isGLValue()) {
      // The subexpression is potentially evaluated; switch the context
      // and recheck the subexpression.
      ExprResult Result = TransformToPotentiallyEvaluated(E);
      if (Result.isInvalid()) return ExprError();
      E = Result.get();

      // We require a vtable to query the type at run time.
      MarkVTableUsed(TypeidLoc, RecordD);
      WasEvaluated = true;
    }
  }

  // C++ [expr.typeid]p4:
  //   [...] If the type of the type-id is a reference to a possibly
  //   cv-qualified type, the result of the typeid expression refers to a
  //   std::type_info object representing the cv-unqualified referenced
  //   type.
  Qualifiers Quals;
  QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals);
  if (!Context.hasSameType(T, UnqualT)) {
    T = UnqualT;
    E = ImpCastExprToType(E, UnqualT, CK_NoOp, E->getValueKind()).get();
  }
}

if (E->getType()->isVariablyModifiedType())
  return ExprError(Diag(TypeidLoc, diag::err_variably_modified_typeid)
                   << E->getType());
else if (!inTemplateInstantiation() &&
         E->HasSideEffects(Context, WasEvaluated)) {
  // The expression operand for typeid is in an unevaluated expression
  // context, so side effects could result in unintended consequences.
  Diag(E->getExprLoc(), WasEvaluated
                            ? diag::warn_side_effects_typeid
                            : diag::warn_side_effects_unevaluated_context);
}

return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), E,
                                   SourceRange(TypeidLoc, RParenLoc));
477}

479/// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
480ExprResult
481Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
                   bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
// Find the std::type_info type.
if (!getStdNamespace())
  return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));

if (!CXXTypeInfoDecl) {
  IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
  LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
  LookupQualifiedName(R, getStdNamespace());
  CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
  // Microsoft's typeinfo doesn't have type_info in std but in the global
  // namespace if _HAS_EXCEPTIONS is defined to 0. See PR13153.
  if (!CXXTypeInfoDecl && LangOpts.MSVCCompat) {
    LookupQualifiedName(R, Context.getTranslationUnitDecl());
    CXXTypeInfoDecl = R.getAsSingle<RecordDecl>();
  }
  if (!CXXTypeInfoDecl)
    return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
}

if (!getLangOpts().RTTI) {
  return ExprError(Diag(OpLoc, diag::err_no_typeid_with_fno_rtti));
}

QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);

if (isType) {
  // The operand is a type; handle it as such.
  TypeSourceInfo *TInfo = nullptr;
  QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
                                 &TInfo);
  if (T.isNull())
    return ExprError();

  if (!TInfo)
    TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);

  return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc);
}

// The operand is an expression.
return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
524}

526/// Grabs __declspec(uuid()) off a type, or returns 0 if we cannot resolve to
527/// a single GUID.
528static void
529getUuidAttrOfType(Sema &SemaRef, QualType QT,
                llvm::SmallSetVector<const UuidAttr *, 1> &UuidAttrs) {
// Optionally remove one level of pointer, reference or array indirection.
const Type *Ty = QT.getTypePtr();
if (QT->isPointerType() || QT->isReferenceType())
  Ty = QT->getPointeeType().getTypePtr();
else if (QT->isArrayType())
  Ty = Ty->getBaseElementTypeUnsafe();

const auto *TD = Ty->getAsTagDecl();
if (!TD)
  return;

if (const auto *Uuid = TD->getMostRecentDecl()->getAttr<UuidAttr>()) {
  UuidAttrs.insert(Uuid);
  return;
}

// __uuidof can grab UUIDs from template arguments.
if (const auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(TD)) {
  const TemplateArgumentList &TAL = CTSD->getTemplateArgs();
  for (const TemplateArgument &TA : TAL.asArray()) {
    const UuidAttr *UuidForTA = nullptr;
    if (TA.getKind() == TemplateArgument::Type)
      getUuidAttrOfType(SemaRef, TA.getAsType(), UuidAttrs);
    else if (TA.getKind() == TemplateArgument::Declaration)
      getUuidAttrOfType(SemaRef, TA.getAsDecl()->getType(), UuidAttrs);

    if (UuidForTA)
      UuidAttrs.insert(UuidForTA);
  }
}
561}

563/// \brief Build a Microsoft __uuidof expression with a type operand.
564ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
                              SourceLocation TypeidLoc,
                              TypeSourceInfo *Operand,
                              SourceLocation RParenLoc) {
StringRef UuidStr;
if (!Operand->getType()->isDependentType()) {
  llvm::SmallSetVector<const UuidAttr *, 1> UuidAttrs;
  getUuidAttrOfType(*this, Operand->getType(), UuidAttrs);
  if (UuidAttrs.empty())
    return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
  if (UuidAttrs.size() > 1)
    return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
  UuidStr = UuidAttrs.back()->getGuid();
}

return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), Operand, UuidStr,
                                   SourceRange(TypeidLoc, RParenLoc));
581}

583/// \brief Build a Microsoft __uuidof expression with an expression operand.
584ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
                              SourceLocation TypeidLoc,
                              Expr *E,
                              SourceLocation RParenLoc) {
StringRef UuidStr;
if (!E->getType()->isDependentType()) {
  if (E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
    UuidStr = "00000000-0000-0000-0000-000000000000";
  } else {
    llvm::SmallSetVector<const UuidAttr *, 1> UuidAttrs;
    getUuidAttrOfType(*this, E->getType(), UuidAttrs);
    if (UuidAttrs.empty())
      return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
    if (UuidAttrs.size() > 1)
      return ExprError(Diag(TypeidLoc, diag::err_uuidof_with_multiple_guids));
    UuidStr = UuidAttrs.back()->getGuid();
  }
}

return new (Context) CXXUuidofExpr(TypeInfoType.withConst(), E, UuidStr,
                                   SourceRange(TypeidLoc, RParenLoc));
605}

607/// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
608ExprResult
609Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
                   bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
// If MSVCGuidDecl has not been cached, do the lookup.
if (!MSVCGuidDecl) {
  IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID");
  LookupResult R(*this, GuidII, SourceLocation(), LookupTagName);
  LookupQualifiedName(R, Context.getTranslationUnitDecl());
  MSVCGuidDecl = R.getAsSingle<RecordDecl>();
  if (!MSVCGuidDecl)
    return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof));
}

QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl);

if (isType) {
  // The operand is a type; handle it as such.
  TypeSourceInfo *TInfo = nullptr;
  QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr),
                                 &TInfo);
  if (T.isNull())
    return ExprError();

  if (!TInfo)
    TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc);

  return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc);
}

// The operand is an expression.
return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
639}

641/// ActOnCXXBoolLiteral - Parse {true,false} literals.
642ExprResult
643Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
assert((Kind == tok::kw_true || Kind == tok::kw_false) &&(static_cast <bool> ((Kind == tok::kw_true || Kind == tok
::kw_false) && "Unknown C++ Boolean value!") ? void (
0) : __assert_fail ("(Kind == tok::kw_true || Kind == tok::kw_false) && \"Unknown C++ Boolean value!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 645, __extension__ __PRETTY_FUNCTION__))
       "Unknown C++ Boolean value!")(static_cast <bool> ((Kind == tok::kw_true || Kind == tok
::kw_false) && "Unknown C++ Boolean value!") ? void (
0) : __assert_fail ("(Kind == tok::kw_true || Kind == tok::kw_false) && \"Unknown C++ Boolean value!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 645, __extension__ __PRETTY_FUNCTION__));
return new (Context)
    CXXBoolLiteralExpr(Kind == tok::kw_true, Context.BoolTy, OpLoc);
648}

650/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
651ExprResult
652Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
return new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
654}

656/// ActOnCXXThrow - Parse throw expressions.
657ExprResult
658Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
bool IsThrownVarInScope = false;
if (Ex) {
1
Assuming 'Ex' is null→
2
←
Taking false branch→
  // C++0x [class.copymove]p31:
  //   When certain criteria are met, an implementation is allowed to omit the
  //   copy/move construction of a class object [...]
  //
  //     - in a throw-expression, when the operand is the name of a
  //       non-volatile automatic object (other than a function or catch-
  //       clause parameter) whose scope does not extend beyond the end of the
  //       innermost enclosing try-block (if there is one), the copy/move
  //       operation from the operand to the exception object (15.1) can be
  //       omitted by constructing the automatic object directly into the
  //       exception object
  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Ex->IgnoreParens()))
    if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
      if (Var->hasLocalStorage() && !Var->getType().isVolatileQualified()) {
        for( ; S; S = S->getParent()) {
          if (S->isDeclScope(Var)) {
            IsThrownVarInScope = true;
            break;
          }

          if (S->getFlags() &
              (Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
               Scope::FunctionPrototypeScope | Scope::ObjCMethodScope |
               Scope::TryScope))
            break;
        }
      }
    }
}

return BuildCXXThrow(OpLoc, Ex, IsThrownVarInScope);
3
←
Calling 'Sema::BuildCXXThrow'→
692}

694ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
                             bool IsThrownVarInScope) {
// Don't report an error if 'throw' is used in system headers.
if (!getLangOpts().CXXExceptions &&
4
←
Assuming the condition is false→
    !getSourceManager().isInSystemHeader(OpLoc))
  Diag(OpLoc, diag::err_exceptions_disabled) << "throw";

// Exceptions aren't allowed in CUDA device code.
if (getLangOpts().CUDA)
5
←
Assuming the condition is true→
6
←
Taking true branch→
  CUDADiagIfDeviceCode(OpLoc, diag::err_cuda_device_exceptions)
7
←
Calling 'operator<<'→
24
←
Returned allocated memory→
      << "throw" << CurrentCUDATarget();

if (getCurScope() && getCurScope()->isOpenMPSimdDirectiveScope())
25
←
Potential leak of memory pointed to by field 'DiagStorage'
  Diag(OpLoc, diag::err_omp_simd_region_cannot_use_stmt) << "throw";

if (Ex && !Ex->isTypeDependent()) {
  QualType ExceptionObjectTy = Context.getExceptionObjectType(Ex->getType());
  if (CheckCXXThrowOperand(OpLoc, ExceptionObjectTy, Ex))
    return ExprError();

  // Initialize the exception result.  This implicitly weeds out
  // abstract types or types with inaccessible copy constructors.

  // C++0x [class.copymove]p31:
  //   When certain criteria are met, an implementation is allowed to omit the
  //   copy/move construction of a class object [...]
  //
  //     - in a throw-expression, when the operand is the name of a
  //       non-volatile automatic object (other than a function or
  //       catch-clause
  //       parameter) whose scope does not extend beyond the end of the
  //       innermost enclosing try-block (if there is one), the copy/move
  //       operation from the operand to the exception object (15.1) can be
  //       omitted by constructing the automatic object directly into the
  //       exception object
  const VarDecl *NRVOVariable = nullptr;
  if (IsThrownVarInScope)
    NRVOVariable = getCopyElisionCandidate(QualType(), Ex, false);

  InitializedEntity Entity = InitializedEntity::InitializeException(
      OpLoc, ExceptionObjectTy,
      /*NRVO=*/NRVOVariable != nullptr);
  ExprResult Res = PerformMoveOrCopyInitialization(
      Entity, NRVOVariable, QualType(), Ex, IsThrownVarInScope);
  if (Res.isInvalid())
    return ExprError();
  Ex = Res.get();
}

return new (Context)
    CXXThrowExpr(Ex, Context.VoidTy, OpLoc, IsThrownVarInScope);
745}

747static void
748collectPublicBases(CXXRecordDecl *RD,
                 llvm::DenseMap<CXXRecordDecl *, unsigned> &SubobjectsSeen,
                 llvm::SmallPtrSetImpl<CXXRecordDecl *> &VBases,
                 llvm::SetVector<CXXRecordDecl *> &PublicSubobjectsSeen,
                 bool ParentIsPublic) {
for (const CXXBaseSpecifier &BS : RD->bases()) {
  CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl();
  bool NewSubobject;
  // Virtual bases constitute the same subobject.  Non-virtual bases are
  // always distinct subobjects.
  if (BS.isVirtual())
    NewSubobject = VBases.insert(BaseDecl).second;
  else
    NewSubobject = true;

  if (NewSubobject)
    ++SubobjectsSeen[BaseDecl];

  // Only add subobjects which have public access throughout the entire chain.
  bool PublicPath = ParentIsPublic && BS.getAccessSpecifier() == AS_public;
  if (PublicPath)
    PublicSubobjectsSeen.insert(BaseDecl);

  // Recurse on to each base subobject.
  collectPublicBases(BaseDecl, SubobjectsSeen, VBases, PublicSubobjectsSeen,
                     PublicPath);
}
775}

777static void getUnambiguousPublicSubobjects(
  CXXRecordDecl *RD, llvm::SmallVectorImpl<CXXRecordDecl *> &Objects) {
llvm::DenseMap<CXXRecordDecl *, unsigned> SubobjectsSeen;
llvm::SmallSet<CXXRecordDecl *, 2> VBases;
llvm::SetVector<CXXRecordDecl *> PublicSubobjectsSeen;
SubobjectsSeen[RD] = 1;
PublicSubobjectsSeen.insert(RD);
collectPublicBases(RD, SubobjectsSeen, VBases, PublicSubobjectsSeen,
                   /*ParentIsPublic=*/true);

for (CXXRecordDecl *PublicSubobject : PublicSubobjectsSeen) {
  // Skip ambiguous objects.
  if (SubobjectsSeen[PublicSubobject] > 1)
    continue;

  Objects.push_back(PublicSubobject);
}
794}

796/// CheckCXXThrowOperand - Validate the operand of a throw.
797bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc,
                              QualType ExceptionObjectTy, Expr *E) {
//   If the type of the exception would be an incomplete type or a pointer
//   to an incomplete type other than (cv) void the program is ill-formed.
QualType Ty = ExceptionObjectTy;
bool isPointer = false;
if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
  Ty = Ptr->getPointeeType();
  isPointer = true;
}
if (!isPointer || !Ty->isVoidType()) {
  if (RequireCompleteType(ThrowLoc, Ty,
                          isPointer ? diag::err_throw_incomplete_ptr
                                    : diag::err_throw_incomplete,
                          E->getSourceRange()))
    return true;

  if (RequireNonAbstractType(ThrowLoc, ExceptionObjectTy,
                             diag::err_throw_abstract_type, E))
    return true;
}

// If the exception has class type, we need additional handling.
CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
if (!RD)
  return false;

// If we are throwing a polymorphic class type or pointer thereof,
// exception handling will make use of the vtable.
MarkVTableUsed(ThrowLoc, RD);

// If a pointer is thrown, the referenced object will not be destroyed.
if (isPointer)
  return false;

// If the class has a destructor, we must be able to call it.
if (!RD->hasIrrelevantDestructor()) {
  if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) {
    MarkFunctionReferenced(E->getExprLoc(), Destructor);
    CheckDestructorAccess(E->getExprLoc(), Destructor,
                          PDiag(diag::err_access_dtor_exception) << Ty);
    if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
      return true;
  }
}

// The MSVC ABI creates a list of all types which can catch the exception
// object.  This list also references the appropriate copy constructor to call
// if the object is caught by value and has a non-trivial copy constructor.
if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
  // We are only interested in the public, unambiguous bases contained within
  // the exception object.  Bases which are ambiguous or otherwise
  // inaccessible are not catchable types.
  llvm::SmallVector<CXXRecordDecl *, 2> UnambiguousPublicSubobjects;
  getUnambiguousPublicSubobjects(RD, UnambiguousPublicSubobjects);

  for (CXXRecordDecl *Subobject : UnambiguousPublicSubobjects) {
    // Attempt to lookup the copy constructor.  Various pieces of machinery
    // will spring into action, like template instantiation, which means this
    // cannot be a simple walk of the class's decls.  Instead, we must perform
    // lookup and overload resolution.
    CXXConstructorDecl *CD = LookupCopyingConstructor(Subobject, 0);
    if (!CD)
      continue;

    // Mark the constructor referenced as it is used by this throw expression.
    MarkFunctionReferenced(E->getExprLoc(), CD);

    // Skip this copy constructor if it is trivial, we don't need to record it
    // in the catchable type data.
    if (CD->isTrivial())
      continue;

    // The copy constructor is non-trivial, create a mapping from this class
    // type to this constructor.
    // N.B.  The selection of copy constructor is not sensitive to this
    // particular throw-site.  Lookup will be performed at the catch-site to
    // ensure that the copy constructor is, in fact, accessible (via
    // friendship or any other means).
    Context.addCopyConstructorForExceptionObject(Subobject, CD);

    // We don't keep the instantiated default argument expressions around so
    // we must rebuild them here.
    for (unsigned I = 1, E = CD->getNumParams(); I != E; ++I) {
      if (CheckCXXDefaultArgExpr(ThrowLoc, CD, CD->getParamDecl(I)))
        return true;
    }
  }
}

return false;
888}

890static QualType adjustCVQualifiersForCXXThisWithinLambda(
  ArrayRef<FunctionScopeInfo *> FunctionScopes, QualType ThisTy,
  DeclContext *CurSemaContext, ASTContext &ASTCtx) {

QualType ClassType = ThisTy->getPointeeType();
LambdaScopeInfo *CurLSI = nullptr;
DeclContext *CurDC = CurSemaContext;

// Iterate through the stack of lambdas starting from the innermost lambda to
// the outermost lambda, checking if '*this' is ever captured by copy - since
// that could change the cv-qualifiers of the '*this' object.
// The object referred to by '*this' starts out with the cv-qualifiers of its
// member function.  We then start with the innermost lambda and iterate
// outward checking to see if any lambda performs a by-copy capture of '*this'
// - and if so, any nested lambda must respect the 'constness' of that
// capturing lamdbda's call operator.
//

// Since the FunctionScopeInfo stack is representative of the lexical
// nesting of the lambda expressions during initial parsing (and is the best
// place for querying information about captures about lambdas that are
// partially processed) and perhaps during instantiation of function templates
// that contain lambda expressions that need to be transformed BUT not
// necessarily during instantiation of a nested generic lambda's function call
// operator (which might even be instantiated at the end of the TU) - at which
// time the DeclContext tree is mature enough to query capture information
// reliably - we use a two pronged approach to walk through all the lexically
// enclosing lambda expressions:
//
//  1) Climb down the FunctionScopeInfo stack as long as each item represents
//  a Lambda (i.e. LambdaScopeInfo) AND each LSI's 'closure-type' is lexically
//  enclosed by the call-operator of the LSI below it on the stack (while
//  tracking the enclosing DC for step 2 if needed).  Note the topmost LSI on
//  the stack represents the innermost lambda.
//
//  2) If we run out of enclosing LSI's, check if the enclosing DeclContext
//  represents a lambda's call operator.  If it does, we must be instantiating
//  a generic lambda's call operator (represented by the Current LSI, and
//  should be the only scenario where an inconsistency between the LSI and the
//  DeclContext should occur), so climb out the DeclContexts if they
//  represent lambdas, while querying the corresponding closure types
//  regarding capture information.

// 1) Climb down the function scope info stack.
for (int I = FunctionScopes.size();
     I-- && isa<LambdaScopeInfo>(FunctionScopes[I]) &&
     (!CurLSI || !CurLSI->Lambda || CurLSI->Lambda->getDeclContext() ==
                     cast<LambdaScopeInfo>(FunctionScopes[I])->CallOperator);
     CurDC = getLambdaAwareParentOfDeclContext(CurDC)) {
  CurLSI = cast<LambdaScopeInfo>(FunctionScopes[I]);

  if (!CurLSI->isCXXThisCaptured())
      continue;

  auto C = CurLSI->getCXXThisCapture();

  if (C.isCopyCapture()) {
    ClassType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
    if (CurLSI->CallOperator->isConst())
      ClassType.addConst();
    return ASTCtx.getPointerType(ClassType);
  }
}

// 2) We've run out of ScopeInfos but check if CurDC is a lambda (which can
// happen during instantiation of its nested generic lambda call operator)
if (isLambdaCallOperator(CurDC)) {
  assert(CurLSI && "While computing 'this' capture-type for a generic "(static_cast <bool> (CurLSI && "While computing 'this' capture-type for a generic "
 "lambda, we must have a corresponding LambdaScopeInfo") ? void
 (0) : __assert_fail ("CurLSI && \"While computing 'this' capture-type for a generic \" \"lambda, we must have a corresponding LambdaScopeInfo\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 958, __extension__ __PRETTY_FUNCTION__))
                   "lambda, we must have a corresponding LambdaScopeInfo")(static_cast <bool> (CurLSI && "While computing 'this' capture-type for a generic "
 "lambda, we must have a corresponding LambdaScopeInfo") ? void
 (0) : __assert_fail ("CurLSI && \"While computing 'this' capture-type for a generic \" \"lambda, we must have a corresponding LambdaScopeInfo\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 958, __extension__ __PRETTY_FUNCTION__));
  assert(isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) &&(static_cast <bool> (isGenericLambdaCallOperatorSpecialization
(CurLSI->CallOperator) && "While computing 'this' capture-type for a generic lambda, when we "
 "run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
 "lambda call oeprator") ? void (0) : __assert_fail ("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 963, __extension__ __PRETTY_FUNCTION__))
         "While computing 'this' capture-type for a generic lambda, when we "(static_cast <bool> (isGenericLambdaCallOperatorSpecialization
(CurLSI->CallOperator) && "While computing 'this' capture-type for a generic lambda, when we "
 "run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
 "lambda call oeprator") ? void (0) : __assert_fail ("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 963, __extension__ __PRETTY_FUNCTION__))
         "run out of enclosing LSI's, yet the enclosing DC is a "(static_cast <bool> (isGenericLambdaCallOperatorSpecialization
(CurLSI->CallOperator) && "While computing 'this' capture-type for a generic lambda, when we "
 "run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
 "lambda call oeprator") ? void (0) : __assert_fail ("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 963, __extension__ __PRETTY_FUNCTION__))
         "lambda-call-operator we must be (i.e. Current LSI) in a generic "(static_cast <bool> (isGenericLambdaCallOperatorSpecialization
(CurLSI->CallOperator) && "While computing 'this' capture-type for a generic lambda, when we "
 "run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
 "lambda call oeprator") ? void (0) : __assert_fail ("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 963, __extension__ __PRETTY_FUNCTION__))
         "lambda call oeprator")(static_cast <bool> (isGenericLambdaCallOperatorSpecialization
(CurLSI->CallOperator) && "While computing 'this' capture-type for a generic lambda, when we "
 "run out of enclosing LSI's, yet the enclosing DC is a " "lambda-call-operator we must be (i.e. Current LSI) in a generic "
 "lambda call oeprator") ? void (0) : __assert_fail ("isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) && \"While computing 'this' capture-type for a generic lambda, when we \" \"run out of enclosing LSI's, yet the enclosing DC is a \" \"lambda-call-operator we must be (i.e. Current LSI) in a generic \" \"lambda call oeprator\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 963, __extension__ __PRETTY_FUNCTION__));
  assert(CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator))(static_cast <bool> (CurDC == getLambdaAwareParentOfDeclContext
(CurLSI->CallOperator)) ? void (0) : __assert_fail ("CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 964, __extension__ __PRETTY_FUNCTION__));

  auto IsThisCaptured =
      [](CXXRecordDecl *Closure, bool &IsByCopy, bool &IsConst) {
    IsConst = false;
    IsByCopy = false;
    for (auto &&C : Closure->captures()) {
      if (C.capturesThis()) {
        if (C.getCaptureKind() == LCK_StarThis)
          IsByCopy = true;
        if (Closure->getLambdaCallOperator()->isConst())
          IsConst = true;
        return true;
      }
    }
    return false;
  };

  bool IsByCopyCapture = false;
  bool IsConstCapture = false;
  CXXRecordDecl *Closure = cast<CXXRecordDecl>(CurDC->getParent());
  while (Closure &&
         IsThisCaptured(Closure, IsByCopyCapture, IsConstCapture)) {
    if (IsByCopyCapture) {
      ClassType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
      if (IsConstCapture)
        ClassType.addConst();
      return ASTCtx.getPointerType(ClassType);
    }
    Closure = isLambdaCallOperator(Closure->getParent())
                  ? cast<CXXRecordDecl>(Closure->getParent()->getParent())
                  : nullptr;
  }
}
return ASTCtx.getPointerType(ClassType);
999}

1001QualType Sema::getCurrentThisType() {
DeclContext *DC = getFunctionLevelDeclContext();
QualType ThisTy = CXXThisTypeOverride;

if (CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC)) {
  if (method && method->isInstance())
    ThisTy = method->getThisType(Context);
}

if (ThisTy.isNull() && isLambdaCallOperator(CurContext) &&
    inTemplateInstantiation()) {

  assert(isa<CXXRecordDecl>(DC) &&(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Trying to get 'this' type from static method?") ? void (0) :
 __assert_fail ("isa<CXXRecordDecl>(DC) && \"Trying to get 'this' type from static method?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1014, __extension__ __PRETTY_FUNCTION__))
         "Trying to get 'this' type from static method?")(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Trying to get 'this' type from static method?") ? void (0) :
 __assert_fail ("isa<CXXRecordDecl>(DC) && \"Trying to get 'this' type from static method?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1014, __extension__ __PRETTY_FUNCTION__));

  // This is a lambda call operator that is being instantiated as a default
  // initializer. DC must point to the enclosing class type, so we can recover
  // the 'this' type from it.

  QualType ClassTy = Context.getTypeDeclType(cast<CXXRecordDecl>(DC));
  // There are no cv-qualifiers for 'this' within default initializers,
  // per [expr.prim.general]p4.
  ThisTy = Context.getPointerType(ClassTy);
}

// If we are within a lambda's call operator, the cv-qualifiers of 'this'
// might need to be adjusted if the lambda or any of its enclosing lambda's
// captures '*this' by copy.
if (!ThisTy.isNull() && isLambdaCallOperator(CurContext))
  return adjustCVQualifiersForCXXThisWithinLambda(FunctionScopes, ThisTy,
                                                  CurContext, Context);
return ThisTy;
1033}

1035Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
                                       Decl *ContextDecl,
                                       unsigned CXXThisTypeQuals,
                                       bool Enabled)
: S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
1040{
if (!Enabled || !ContextDecl)
  return;

CXXRecordDecl *Record = nullptr;
if (ClassTemplateDecl *Template = dyn_cast<ClassTemplateDecl>(ContextDecl))
  Record = Template->getTemplatedDecl();
else
  Record = cast<CXXRecordDecl>(ContextDecl);

// We care only for CVR qualifiers here, so cut everything else.
CXXThisTypeQuals &= Qualifiers::FastMask;
S.CXXThisTypeOverride
  = S.Context.getPointerType(
      S.Context.getRecordType(Record).withCVRQualifiers(CXXThisTypeQuals));

this->Enabled = true;
1057}


1060Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
if (Enabled) {
  S.CXXThisTypeOverride = OldCXXThisTypeOverride;
}
1064}

1066static Expr *captureThis(Sema &S, ASTContext &Context, RecordDecl *RD,
                       QualType ThisTy, SourceLocation Loc,
                       const bool ByCopy) {

QualType AdjustedThisTy = ThisTy;
// The type of the corresponding data member (not a 'this' pointer if 'by
// copy').
QualType CaptureThisFieldTy = ThisTy;
if (ByCopy) {
  // If we are capturing the object referred to by '*this' by copy, ignore any
  // cv qualifiers inherited from the type of the member function for the type
  // of the closure-type's corresponding data member and any use of 'this'.
  CaptureThisFieldTy = ThisTy->getPointeeType();
  CaptureThisFieldTy.removeLocalCVRQualifiers(Qualifiers::CVRMask);
  AdjustedThisTy = Context.getPointerType(CaptureThisFieldTy);
}

FieldDecl *Field = FieldDecl::Create(
    Context, RD, Loc, Loc, nullptr, CaptureThisFieldTy,
    Context.getTrivialTypeSourceInfo(CaptureThisFieldTy, Loc), nullptr, false,
    ICIS_NoInit);

Field->setImplicit(true);
Field->setAccess(AS_private);
RD->addDecl(Field);
Expr *This =
    new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit*/ true);
if (ByCopy) {
  Expr *StarThis =  S.CreateBuiltinUnaryOp(Loc,
                                    UO_Deref,
                                    This).get();
  InitializedEntity Entity = InitializedEntity::InitializeLambdaCapture(
    nullptr, CaptureThisFieldTy, Loc);
  InitializationKind InitKind = InitializationKind::CreateDirect(Loc, Loc, Loc);
  InitializationSequence Init(S, Entity, InitKind, StarThis);
  ExprResult ER = Init.Perform(S, Entity, InitKind, StarThis);
  if (ER.isInvalid()) return nullptr;
  return ER.get();
}
return This;
1106}

1108bool Sema::CheckCXXThisCapture(SourceLocation Loc, const bool Explicit,
  bool BuildAndDiagnose, const unsigned *const FunctionScopeIndexToStopAt,
  const bool ByCopy) {
// We don't need to capture this in an unevaluated context.
if (isUnevaluatedContext() && !Explicit)
  return true;

assert((!ByCopy || Explicit) && "cannot implicitly capture *this by value")(static_cast <bool> ((!ByCopy || Explicit) && "cannot implicitly capture *this by value"
) ? void (0) : __assert_fail ("(!ByCopy || Explicit) && \"cannot implicitly capture *this by value\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1115, __extension__ __PRETTY_FUNCTION__));

const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt ?
  *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;

// Check that we can capture the *enclosing object* (referred to by '*this')
// by the capturing-entity/closure (lambda/block/etc) at
// MaxFunctionScopesIndex-deep on the FunctionScopes stack.

// Note: The *enclosing object* can only be captured by-value by a
// closure that is a lambda, using the explicit notation:
//    [*this] { ... }.
// Every other capture of the *enclosing object* results in its by-reference
// capture.

// For a closure 'L' (at MaxFunctionScopesIndex in the FunctionScopes
// stack), we can capture the *enclosing object* only if:
// - 'L' has an explicit byref or byval capture of the *enclosing object*
// -  or, 'L' has an implicit capture.
// AND
//   -- there is no enclosing closure
//   -- or, there is some enclosing closure 'E' that has already captured the
//      *enclosing object*, and every intervening closure (if any) between 'E'
//      and 'L' can implicitly capture the *enclosing object*.
//   -- or, every enclosing closure can implicitly capture the
//      *enclosing object*


unsigned NumCapturingClosures = 0;
for (unsigned idx = MaxFunctionScopesIndex; idx != 0; idx--) {
  if (CapturingScopeInfo *CSI =
          dyn_cast<CapturingScopeInfo>(FunctionScopes[idx])) {
    if (CSI->CXXThisCaptureIndex != 0) {
      // 'this' is already being captured; there isn't anything more to do.
      CSI->Captures[CSI->CXXThisCaptureIndex - 1].markUsed(BuildAndDiagnose);
      break;
    }
    LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI);
    if (LSI && isGenericLambdaCallOperatorSpecialization(LSI->CallOperator)) {
      // This context can't implicitly capture 'this'; fail out.
      if (BuildAndDiagnose)
        Diag(Loc, diag::err_this_capture)
            << (Explicit && idx == MaxFunctionScopesIndex);
      return true;
    }
    if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByref ||
        CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval ||
        CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_Block ||
        CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_CapturedRegion ||
        (Explicit && idx == MaxFunctionScopesIndex)) {
      // Regarding (Explicit && idx == MaxFunctionScopesIndex): only the first
      // iteration through can be an explicit capture, all enclosing closures,
      // if any, must perform implicit captures.

      // This closure can capture 'this'; continue looking upwards.
      NumCapturingClosures++;
      continue;
    }
    // This context can't implicitly capture 'this'; fail out.
    if (BuildAndDiagnose)
      Diag(Loc, diag::err_this_capture)
          << (Explicit && idx == MaxFunctionScopesIndex);
    return true;
  }
  break;
}
if (!BuildAndDiagnose) return false;

// If we got here, then the closure at MaxFunctionScopesIndex on the
// FunctionScopes stack, can capture the *enclosing object*, so capture it
// (including implicit by-reference captures in any enclosing closures).

// In the loop below, respect the ByCopy flag only for the closure requesting
// the capture (i.e. first iteration through the loop below).  Ignore it for
// all enclosing closure's up to NumCapturingClosures (since they must be
// implicitly capturing the *enclosing  object* by reference (see loop
// above)).
assert((!ByCopy ||(static_cast <bool> ((!ByCopy || dyn_cast<LambdaScopeInfo
>(FunctionScopes[MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
 "*this) by copy") ? void (0) : __assert_fail ("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1195, __extension__ __PRETTY_FUNCTION__))
        dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) &&(static_cast <bool> ((!ByCopy || dyn_cast<LambdaScopeInfo
>(FunctionScopes[MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
 "*this) by copy") ? void (0) : __assert_fail ("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1195, __extension__ __PRETTY_FUNCTION__))
       "Only a lambda can capture the enclosing object (referred to by "(static_cast <bool> ((!ByCopy || dyn_cast<LambdaScopeInfo
>(FunctionScopes[MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
 "*this) by copy") ? void (0) : __assert_fail ("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1195, __extension__ __PRETTY_FUNCTION__))
       "*this) by copy")(static_cast <bool> ((!ByCopy || dyn_cast<LambdaScopeInfo
>(FunctionScopes[MaxFunctionScopesIndex])) && "Only a lambda can capture the enclosing object (referred to by "
 "*this) by copy") ? void (0) : __assert_fail ("(!ByCopy || dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) && \"Only a lambda can capture the enclosing object (referred to by \" \"*this) by copy\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1195, __extension__ __PRETTY_FUNCTION__));
// FIXME: We need to delay this marking in PotentiallyPotentiallyEvaluated
// contexts.
QualType ThisTy = getCurrentThisType();
for (unsigned idx = MaxFunctionScopesIndex; NumCapturingClosures;
    --idx, --NumCapturingClosures) {
  CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);
  Expr *ThisExpr = nullptr;

  if (LambdaScopeInfo *LSI = dyn_cast<LambdaScopeInfo>(CSI)) {
    // For lambda expressions, build a field and an initializing expression,
    // and capture the *enclosing object* by copy only if this is the first
    // iteration.
    ThisExpr = captureThis(*this, Context, LSI->Lambda, ThisTy, Loc,
                           ByCopy && idx == MaxFunctionScopesIndex);

  } else if (CapturedRegionScopeInfo *RSI
      = dyn_cast<CapturedRegionScopeInfo>(FunctionScopes[idx]))
    ThisExpr =
        captureThis(*this, Context, RSI->TheRecordDecl, ThisTy, Loc,
                    false/*ByCopy*/);

  bool isNested = NumCapturingClosures > 1;
  CSI->addThisCapture(isNested, Loc, ThisExpr, ByCopy);
}
return false;
1221}

1223ExprResult Sema::ActOnCXXThis(SourceLocation Loc) {
/// C++ 9.3.2: In the body of a non-static member function, the keyword this
/// is a non-lvalue expression whose value is the address of the object for
/// which the function is called.

QualType ThisTy = getCurrentThisType();
if (ThisTy.isNull()) return Diag(Loc, diag::err_invalid_this_use);

CheckCXXThisCapture(Loc);
return new (Context) CXXThisExpr(Loc, ThisTy, /*isImplicit=*/false);
1233}

1235bool Sema::isThisOutsideMemberFunctionBody(QualType BaseType) {
// If we're outside the body of a member function, then we'll have a specified
// type for 'this'.
if (CXXThisTypeOverride.isNull())
  return false;

// Determine whether we're looking into a class that's currently being
// defined.
CXXRecordDecl *Class = BaseType->getAsCXXRecordDecl();
return Class && Class->isBeingDefined();
1245}

1247/// Parse construction of a specified type.
1248/// Can be interpreted either as function-style casting ("int(x)")
1249/// or class type construction ("ClassType(x,y,z)")
1250/// or creation of a value-initialized type ("int()").
1251ExprResult
1252Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep,
                              SourceLocation LParenOrBraceLoc,
                              MultiExprArg exprs,
                              SourceLocation RParenOrBraceLoc,
                              bool ListInitialization) {
if (!TypeRep)
  return ExprError();

TypeSourceInfo *TInfo;
QualType Ty = GetTypeFromParser(TypeRep, &TInfo);
if (!TInfo)
  TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation());

auto Result = BuildCXXTypeConstructExpr(TInfo, LParenOrBraceLoc, exprs,
                                        RParenOrBraceLoc, ListInitialization);
// Avoid creating a non-type-dependent expression that contains typos.
// Non-type-dependent expressions are liable to be discarded without
// checking for embedded typos.
if (!Result.isInvalid() && Result.get()->isInstantiationDependent() &&
    !Result.get()->isTypeDependent())
  Result = CorrectDelayedTyposInExpr(Result.get());
return Result;
1274}

1276ExprResult
1277Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
                              SourceLocation LParenOrBraceLoc,
                              MultiExprArg Exprs,
                              SourceLocation RParenOrBraceLoc,
                              bool ListInitialization) {
QualType Ty = TInfo->getType();
SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();

if (Ty->isDependentType() || CallExpr::hasAnyTypeDependentArguments(Exprs)) {
  // FIXME: CXXUnresolvedConstructExpr does not model list-initialization
  // directly. We work around this by dropping the locations of the braces.
  SourceRange Locs = ListInitialization
                         ? SourceRange()
                         : SourceRange(LParenOrBraceLoc, RParenOrBraceLoc);
  return CXXUnresolvedConstructExpr::Create(Context, TInfo, Locs.getBegin(),
                                            Exprs, Locs.getEnd());
}

assert((!ListInitialization ||(static_cast <bool> ((!ListInitialization || (Exprs.size
() == 1 && isa<InitListExpr>(Exprs[0]))) &&
 "List initialization must have initializer list as expression."
) ? void (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1297, __extension__ __PRETTY_FUNCTION__))
        (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) &&(static_cast <bool> ((!ListInitialization || (Exprs.size
() == 1 && isa<InitListExpr>(Exprs[0]))) &&
 "List initialization must have initializer list as expression."
) ? void (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1297, __extension__ __PRETTY_FUNCTION__))
       "List initialization must have initializer list as expression.")(static_cast <bool> ((!ListInitialization || (Exprs.size
() == 1 && isa<InitListExpr>(Exprs[0]))) &&
 "List initialization must have initializer list as expression."
) ? void (0) : __assert_fail ("(!ListInitialization || (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) && \"List initialization must have initializer list as expression.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1297, __extension__ __PRETTY_FUNCTION__));
SourceRange FullRange = SourceRange(TyBeginLoc, RParenOrBraceLoc);

InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo);
InitializationKind Kind =
    Exprs.size()
        ? ListInitialization
              ? InitializationKind::CreateDirectList(
                    TyBeginLoc, LParenOrBraceLoc, RParenOrBraceLoc)
              : InitializationKind::CreateDirect(TyBeginLoc, LParenOrBraceLoc,
                                                 RParenOrBraceLoc)
        : InitializationKind::CreateValue(TyBeginLoc, LParenOrBraceLoc,
                                          RParenOrBraceLoc);

// C++1z [expr.type.conv]p1:
//   If the type is a placeholder for a deduced class type, [...perform class
//   template argument deduction...]
DeducedType *Deduced = Ty->getContainedDeducedType();
if (Deduced && isa<DeducedTemplateSpecializationType>(Deduced)) {
  Ty = DeduceTemplateSpecializationFromInitializer(TInfo, Entity,
                                                   Kind, Exprs);
  if (Ty.isNull())
    return ExprError();
  Entity = InitializedEntity::InitializeTemporary(TInfo, Ty);
}

// C++ [expr.type.conv]p1:
// If the expression list is a parenthesized single expression, the type
// conversion expression is equivalent (in definedness, and if defined in
// meaning) to the corresponding cast expression.
if (Exprs.size() == 1 && !ListInitialization &&
    !isa<InitListExpr>(Exprs[0])) {
  Expr *Arg = Exprs[0];
  return BuildCXXFunctionalCastExpr(TInfo, Ty, LParenOrBraceLoc, Arg,
                                    RParenOrBraceLoc);
}

//   For an expression of the form T(), T shall not be an array type.
QualType ElemTy = Ty;
if (Ty->isArrayType()) {
  if (!ListInitialization)
    return ExprError(Diag(TyBeginLoc, diag::err_value_init_for_array_type)
                       << FullRange);
  ElemTy = Context.getBaseElementType(Ty);
}

// There doesn't seem to be an explicit rule against this but sanity demands
// we only construct objects with object types.
if (Ty->isFunctionType())
  return ExprError(Diag(TyBeginLoc, diag::err_init_for_function_type)
                     << Ty << FullRange);

// C++17 [expr.type.conv]p2:
//   If the type is cv void and the initializer is (), the expression is a
//   prvalue of the specified type that performs no initialization.
if (!Ty->isVoidType() &&
    RequireCompleteType(TyBeginLoc, ElemTy,
                        diag::err_invalid_incomplete_type_use, FullRange))
  return ExprError();

//   Otherwise, the expression is a prvalue of the specified type whose
//   result object is direct-initialized (11.6) with the initializer.
InitializationSequence InitSeq(*this, Entity, Kind, Exprs);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Exprs);

if (Result.isInvalid())
  return Result;

Expr *Inner = Result.get();
if (CXXBindTemporaryExpr *BTE = dyn_cast_or_null<CXXBindTemporaryExpr>(Inner))
  Inner = BTE->getSubExpr();
if (!isa<CXXTemporaryObjectExpr>(Inner) &&
    !isa<CXXScalarValueInitExpr>(Inner)) {
  // If we created a CXXTemporaryObjectExpr, that node also represents the
  // functional cast. Otherwise, create an explicit cast to represent
  // the syntactic form of a functional-style cast that was used here.
  //
  // FIXME: Creating a CXXFunctionalCastExpr around a CXXConstructExpr
  // would give a more consistent AST representation than using a
  // CXXTemporaryObjectExpr. It's also weird that the functional cast
  // is sometimes handled by initialization and sometimes not.
  QualType ResultType = Result.get()->getType();
  SourceRange Locs = ListInitialization
                         ? SourceRange()
                         : SourceRange(LParenOrBraceLoc, RParenOrBraceLoc);
  Result = CXXFunctionalCastExpr::Create(
      Context, ResultType, Expr::getValueKindForType(Ty), TInfo, CK_NoOp,
      Result.get(), /*Path=*/nullptr, Locs.getBegin(), Locs.getEnd());
}

return Result;
1388}

1390/// \brief Determine whether the given function is a non-placement
1391/// deallocation function.
1392static bool isNonPlacementDeallocationFunction(Sema &S, FunctionDecl *FD) {
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
  return Method->isUsualDeallocationFunction();

if (FD->getOverloadedOperator() != OO_Delete &&
    FD->getOverloadedOperator() != OO_Array_Delete)
  return false;

unsigned UsualParams = 1;

if (S.getLangOpts().SizedDeallocation && UsualParams < FD->getNumParams() &&
    S.Context.hasSameUnqualifiedType(
        FD->getParamDecl(UsualParams)->getType(),
        S.Context.getSizeType()))
  ++UsualParams;

if (S.getLangOpts().AlignedAllocation && UsualParams < FD->getNumParams() &&
    S.Context.hasSameUnqualifiedType(
        FD->getParamDecl(UsualParams)->getType(),
        S.Context.getTypeDeclType(S.getStdAlignValT())))
  ++UsualParams;

return UsualParams == FD->getNumParams();
1415}

1417namespace {
struct UsualDeallocFnInfo {
  UsualDeallocFnInfo() : Found(), FD(nullptr) {}
  UsualDeallocFnInfo(Sema &S, DeclAccessPair Found)
      : Found(Found), FD(dyn_cast<FunctionDecl>(Found->getUnderlyingDecl())),
        Destroying(false), HasSizeT(false), HasAlignValT(false),
        CUDAPref(Sema::CFP_Native) {
    // A function template declaration is never a usual deallocation function.
    if (!FD)
      return;
    unsigned NumBaseParams = 1;
    if (FD->isDestroyingOperatorDelete()) {
      Destroying = true;
      ++NumBaseParams;
    }
    if (FD->getNumParams() == NumBaseParams + 2)
      HasAlignValT = HasSizeT = true;
    else if (FD->getNumParams() == NumBaseParams + 1) {
      HasSizeT = FD->getParamDecl(NumBaseParams)->getType()->isIntegerType();
      HasAlignValT = !HasSizeT;
    }

    // In CUDA, determine how much we'd like / dislike to call this.
    if (S.getLangOpts().CUDA)
      if (auto *Caller = dyn_cast<FunctionDecl>(S.CurContext))
        CUDAPref = S.IdentifyCUDAPreference(Caller, FD);
  }

  operator bool() const { return FD; }

  bool isBetterThan(const UsualDeallocFnInfo &Other, bool WantSize,
                    bool WantAlign) const {
    // C++ P0722:
    //   A destroying operator delete is preferred over a non-destroying
    //   operator delete.
    if (Destroying != Other.Destroying)
      return Destroying;

    // C++17 [expr.delete]p10:
    //   If the type has new-extended alignment, a function with a parameter
    //   of type std::align_val_t is preferred; otherwise a function without
    //   such a parameter is preferred
    if (HasAlignValT != Other.HasAlignValT)
      return HasAlignValT == WantAlign;

    if (HasSizeT != Other.HasSizeT)
      return HasSizeT == WantSize;

    // Use CUDA call preference as a tiebreaker.
    return CUDAPref > Other.CUDAPref;
  }

  DeclAccessPair Found;
  FunctionDecl *FD;
  bool Destroying, HasSizeT, HasAlignValT;
  Sema::CUDAFunctionPreference CUDAPref;
};
1474}

1476/// Determine whether a type has new-extended alignment. This may be called when
1477/// the type is incomplete (for a delete-expression with an incomplete pointee
1478/// type), in which case it will conservatively return false if the alignment is
1479/// not known.
1480static bool hasNewExtendedAlignment(Sema &S, QualType AllocType) {
return S.getLangOpts().AlignedAllocation &&
       S.getASTContext().getTypeAlignIfKnown(AllocType) >
           S.getASTContext().getTargetInfo().getNewAlign();
1484}

1486/// Select the correct "usual" deallocation function to use from a selection of
1487/// deallocation functions (either global or class-scope).
1488static UsualDeallocFnInfo resolveDeallocationOverload(
  Sema &S, LookupResult &R, bool WantSize, bool WantAlign,
  llvm::SmallVectorImpl<UsualDeallocFnInfo> *BestFns = nullptr) {
UsualDeallocFnInfo Best;

for (auto I = R.begin(), E = R.end(); I != E; ++I) {
  UsualDeallocFnInfo Info(S, I.getPair());
  if (!Info || !isNonPlacementDeallocationFunction(S, Info.FD) ||
      Info.CUDAPref == Sema::CFP_Never)
    continue;

  if (!Best) {
    Best = Info;
    if (BestFns)
      BestFns->push_back(Info);
    continue;
  }

  if (Best.isBetterThan(Info, WantSize, WantAlign))
    continue;

  //   If more than one preferred function is found, all non-preferred
  //   functions are eliminated from further consideration.
  if (BestFns && Info.isBetterThan(Best, WantSize, WantAlign))
    BestFns->clear();

  Best = Info;
  if (BestFns)
    BestFns->push_back(Info);
}

return Best;
1520}

1522/// Determine whether a given type is a class for which 'delete[]' would call
1523/// a member 'operator delete[]' with a 'size_t' parameter. This implies that
1524/// we need to store the array size (even if the type is
1525/// trivially-destructible).
1526static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc,
                                       QualType allocType) {
const RecordType *record =
  allocType->getBaseElementTypeUnsafe()->getAs<RecordType>();
if (!record) return false;

// Try to find an operator delete[] in class scope.

DeclarationName deleteName =
  S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete);
LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName);
S.LookupQualifiedName(ops, record->getDecl());

// We're just doing this for information.
ops.suppressDiagnostics();

// Very likely: there's no operator delete[].
if (ops.empty()) return false;

// If it's ambiguous, it should be illegal to call operator delete[]
// on this thing, so it doesn't matter if we allocate extra space or not.
if (ops.isAmbiguous()) return false;

// C++17 [expr.delete]p10:
//   If the deallocation functions have class scope, the one without a
//   parameter of type std::size_t is selected.
auto Best = resolveDeallocationOverload(
    S, ops, /*WantSize*/false,
    /*WantAlign*/hasNewExtendedAlignment(S, allocType));
return Best && Best.HasSizeT;
1556}

1558/// \brief Parsed a C++ 'new' expression (C++ 5.3.4).
1559///
1560/// E.g.:
1561/// @code new (memory) int[size][4] @endcode
1562/// or
1563/// @code ::new Foo(23, "hello") @endcode
1564///
1565/// \param StartLoc The first location of the expression.
1566/// \param UseGlobal True if 'new' was prefixed with '::'.
1567/// \param PlacementLParen Opening paren of the placement arguments.
1568/// \param PlacementArgs Placement new arguments.
1569/// \param PlacementRParen Closing paren of the placement arguments.
1570/// \param TypeIdParens If the type is in parens, the source range.
1571/// \param D The type to be allocated, as well as array dimensions.
1572/// \param Initializer The initializing expression or initializer-list, or null
1573///   if there is none.
1574ExprResult
1575Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
                SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
                SourceLocation PlacementRParen, SourceRange TypeIdParens,
                Declarator &D, Expr *Initializer) {
Expr *ArraySize = nullptr;
// If the specified type is an array, unwrap it and save the expression.
if (D.getNumTypeObjects() > 0 &&
    D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
  DeclaratorChunk &Chunk = D.getTypeObject(0);
  if (D.getDeclSpec().hasAutoTypeSpec())
    return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto)
      << D.getSourceRange());
  if (Chunk.Arr.hasStatic)
    return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
      << D.getSourceRange());
  if (!Chunk.Arr.NumElts)
    return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
      << D.getSourceRange());

  ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
  D.DropFirstTypeObject();
}

// Every dimension shall be of constant size.
if (ArraySize) {
  for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
    if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
      break;

    DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
    if (Expr *NumElts = (Expr *)Array.NumElts) {
      if (!NumElts->isTypeDependent() && !NumElts->isValueDependent()) {
        if (getLangOpts().CPlusPlus14) {
   // C++1y [expr.new]p6: Every constant-expression in a noptr-new-declarator
   //   shall be a converted constant expression (5.19) of type std::size_t
   //   and shall evaluate to a strictly positive value.
          unsigned IntWidth = Context.getTargetInfo().getIntWidth();
          assert(IntWidth && "Builtin type of size 0?")(static_cast <bool> (IntWidth && "Builtin type of size 0?"
) ? void (0) : __assert_fail ("IntWidth && \"Builtin type of size 0?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1612, __extension__ __PRETTY_FUNCTION__));
          llvm::APSInt Value(IntWidth);
          Array.NumElts
           = CheckConvertedConstantExpression(NumElts, Context.getSizeType(), Value,
                                              CCEK_NewExpr)
               .get();
        } else {
          Array.NumElts
            = VerifyIntegerConstantExpression(NumElts, nullptr,
                                              diag::err_new_array_nonconst)
                .get();
        }
        if (!Array.NumElts)
          return ExprError();
      }
    }
  }
}

TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/nullptr);
QualType AllocType = TInfo->getType();
if (D.isInvalidType())
  return ExprError();

SourceRange DirectInitRange;
if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer))
  DirectInitRange = List->getSourceRange();

return BuildCXXNew(SourceRange(StartLoc, D.getLocEnd()), UseGlobal,
                   PlacementLParen,
                   PlacementArgs,
                   PlacementRParen,
                   TypeIdParens,
                   AllocType,
                   TInfo,
                   ArraySize,
                   DirectInitRange,
                   Initializer);
1650}

1652static bool isLegalArrayNewInitializer(CXXNewExpr::InitializationStyle Style,
                                     Expr *Init) {
if (!Init)
  return true;
if (ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init))
  return PLE->getNumExprs() == 0;
if (isa<ImplicitValueInitExpr>(Init))
  return true;
else if (CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init))
  return !CCE->isListInitialization() &&
         CCE->getConstructor()->isDefaultConstructor();
else if (Style == CXXNewExpr::ListInit) {
  assert(isa<InitListExpr>(Init) &&(static_cast <bool> (isa<InitListExpr>(Init) &&
 "Shouldn't create list CXXConstructExprs for arrays.") ? void
 (0) : __assert_fail ("isa<InitListExpr>(Init) && \"Shouldn't create list CXXConstructExprs for arrays.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1665, __extension__ __PRETTY_FUNCTION__))
         "Shouldn't create list CXXConstructExprs for arrays.")(static_cast <bool> (isa<InitListExpr>(Init) &&
 "Shouldn't create list CXXConstructExprs for arrays.") ? void
 (0) : __assert_fail ("isa<InitListExpr>(Init) && \"Shouldn't create list CXXConstructExprs for arrays.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1665, __extension__ __PRETTY_FUNCTION__));
  return true;
}
return false;
1669}

1671// Emit a diagnostic if an aligned allocation/deallocation function that is not
1672// implemented in the standard library is selected.
1673static void diagnoseUnavailableAlignedAllocation(const FunctionDecl &FD,
                                               SourceLocation Loc, bool IsDelete,
                                               Sema &S) {
if (!S.getLangOpts().AlignedAllocationUnavailable)
  return;

// Return if there is a definition.
if (FD.isDefined())
  return;

bool IsAligned = false;
if (FD.isReplaceableGlobalAllocationFunction(&IsAligned) && IsAligned) {
  const llvm::Triple &T = S.getASTContext().getTargetInfo().getTriple();
  StringRef OSName = AvailabilityAttr::getPlatformNameSourceSpelling(
      S.getASTContext().getTargetInfo().getPlatformName());

  S.Diag(Loc, diag::warn_aligned_allocation_unavailable)
       << IsDelete << FD.getType().getAsString() << OSName
       << alignedAllocMinVersion(T.getOS()).getAsString();
  S.Diag(Loc, diag::note_silence_unligned_allocation_unavailable);
}
1694}

1696ExprResult
1697Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
                SourceLocation PlacementLParen,
                MultiExprArg PlacementArgs,
                SourceLocation PlacementRParen,
                SourceRange TypeIdParens,
                QualType AllocType,
                TypeSourceInfo *AllocTypeInfo,
                Expr *ArraySize,
                SourceRange DirectInitRange,
                Expr *Initializer) {
SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange();
SourceLocation StartLoc = Range.getBegin();

CXXNewExpr::InitializationStyle initStyle;
if (DirectInitRange.isValid()) {
  assert(Initializer && "Have parens but no initializer.")(static_cast <bool> (Initializer && "Have parens but no initializer."
) ? void (0) : __assert_fail ("Initializer && \"Have parens but no initializer.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1712, __extension__ __PRETTY_FUNCTION__));
  initStyle = CXXNewExpr::CallInit;
} else if (Initializer && isa<InitListExpr>(Initializer))
  initStyle = CXXNewExpr::ListInit;
else {
  assert((!Initializer || isa<ImplicitValueInitExpr>(Initializer) ||(static_cast <bool> ((!Initializer || isa<ImplicitValueInitExpr
>(Initializer) || isa<CXXConstructExpr>(Initializer)
) && "Initializer expression that cannot have been implicitly created."
) ? void (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1719, __extension__ __PRETTY_FUNCTION__))
          isa<CXXConstructExpr>(Initializer)) &&(static_cast <bool> ((!Initializer || isa<ImplicitValueInitExpr
>(Initializer) || isa<CXXConstructExpr>(Initializer)
) && "Initializer expression that cannot have been implicitly created."
) ? void (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1719, __extension__ __PRETTY_FUNCTION__))
         "Initializer expression that cannot have been implicitly created.")(static_cast <bool> ((!Initializer || isa<ImplicitValueInitExpr
>(Initializer) || isa<CXXConstructExpr>(Initializer)
) && "Initializer expression that cannot have been implicitly created."
) ? void (0) : __assert_fail ("(!Initializer || isa<ImplicitValueInitExpr>(Initializer) || isa<CXXConstructExpr>(Initializer)) && \"Initializer expression that cannot have been implicitly created.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1719, __extension__ __PRETTY_FUNCTION__));
  initStyle = CXXNewExpr::NoInit;
}

Expr **Inits = &Initializer;
unsigned NumInits = Initializer ? 1 : 0;
if (ParenListExpr *List = dyn_cast_or_null<ParenListExpr>(Initializer)) {
  assert(initStyle == CXXNewExpr::CallInit && "paren init for non-call init")(static_cast <bool> (initStyle == CXXNewExpr::CallInit &&
 "paren init for non-call init") ? void (0) : __assert_fail (
"initStyle == CXXNewExpr::CallInit && \"paren init for non-call init\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1726, __extension__ __PRETTY_FUNCTION__));
  Inits = List->getExprs();
  NumInits = List->getNumExprs();
}

// C++11 [expr.new]p15:
//   A new-expression that creates an object of type T initializes that
//   object as follows:
InitializationKind Kind
//     - If the new-initializer is omitted, the object is default-
//       initialized (8.5); if no initialization is performed,
//       the object has indeterminate value
  = initStyle == CXXNewExpr::NoInit
      ? InitializationKind::CreateDefault(TypeRange.getBegin())
//     - Otherwise, the new-initializer is interpreted according to the
//       initialization rules of 8.5 for direct-initialization.
      : initStyle == CXXNewExpr::ListInit
          ? InitializationKind::CreateDirectList(TypeRange.getBegin(),
                                                 Initializer->getLocStart(),
                                                 Initializer->getLocEnd())
          : InitializationKind::CreateDirect(TypeRange.getBegin(),
                                             DirectInitRange.getBegin(),
                                             DirectInitRange.getEnd());

// C++11 [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for.
auto *Deduced = AllocType->getContainedDeducedType();
if (Deduced && isa<DeducedTemplateSpecializationType>(Deduced)) {
  if (ArraySize)
    return ExprError(Diag(ArraySize->getExprLoc(),
                          diag::err_deduced_class_template_compound_type)
                     << /*array*/ 2 << ArraySize->getSourceRange());

  InitializedEntity Entity
    = InitializedEntity::InitializeNew(StartLoc, AllocType);
  AllocType = DeduceTemplateSpecializationFromInitializer(
      AllocTypeInfo, Entity, Kind, MultiExprArg(Inits, NumInits));
  if (AllocType.isNull())
    return ExprError();
} else if (Deduced) {
  bool Braced = (initStyle == CXXNewExpr::ListInit);
  if (NumInits == 1) {
    if (auto p = dyn_cast_or_null<InitListExpr>(Inits[0])) {
      Inits = p->getInits();
      NumInits = p->getNumInits();
      Braced = true;
    }
  }

  if (initStyle == CXXNewExpr::NoInit || NumInits == 0)
    return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg)
                     << AllocType << TypeRange);
  if (NumInits > 1) {
    Expr *FirstBad = Inits[1];
    return ExprError(Diag(FirstBad->getLocStart(),
                          diag::err_auto_new_ctor_multiple_expressions)
                     << AllocType << TypeRange);
  }
  if (Braced && !getLangOpts().CPlusPlus17)
    Diag(Initializer->getLocStart(), diag::ext_auto_new_list_init)
        << AllocType << TypeRange;
  Expr *Deduce = Inits[0];
  QualType DeducedType;
  if (DeduceAutoType(AllocTypeInfo, Deduce, DeducedType) == DAR_Failed)
    return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure)
                     << AllocType << Deduce->getType()
                     << TypeRange << Deduce->getSourceRange());
  if (DeducedType.isNull())
    return ExprError();
  AllocType = DeducedType;
}

// Per C++0x [expr.new]p5, the type being constructed may be a
// typedef of an array type.
if (!ArraySize) {
  if (const ConstantArrayType *Array
                            = Context.getAsConstantArrayType(AllocType)) {
    ArraySize = IntegerLiteral::Create(Context, Array->getSize(),
                                       Context.getSizeType(),
                                       TypeRange.getEnd());
    AllocType = Array->getElementType();
  }
}

if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange))
  return ExprError();

if (initStyle == CXXNewExpr::ListInit &&
    isStdInitializerList(AllocType, nullptr)) {
  Diag(AllocTypeInfo->getTypeLoc().getBeginLoc(),
       diag::warn_dangling_std_initializer_list)
      << /*at end of FE*/0 << Inits[0]->getSourceRange();
}

// In ARC, infer 'retaining' for the allocated
if (getLangOpts().ObjCAutoRefCount &&
    AllocType.getObjCLifetime() == Qualifiers::OCL_None &&
    AllocType->isObjCLifetimeType()) {
  AllocType = Context.getLifetimeQualifiedType(AllocType,
                                  AllocType->getObjCARCImplicitLifetime());
}

QualType ResultType = Context.getPointerType(AllocType);

if (ArraySize && ArraySize->getType()->isNonOverloadPlaceholderType()) {
  ExprResult result = CheckPlaceholderExpr(ArraySize);
  if (result.isInvalid()) return ExprError();
  ArraySize = result.get();
}
// C++98 5.3.4p6: "The expression in a direct-new-declarator shall have
//   integral or enumeration type with a non-negative value."
// C++11 [expr.new]p6: The expression [...] shall be of integral or unscoped
//   enumeration type, or a class type for which a single non-explicit
//   conversion function to integral or unscoped enumeration type exists.
// C++1y [expr.new]p6: The expression [...] is implicitly converted to
//   std::size_t.
llvm::Optional<uint64_t> KnownArraySize;
if (ArraySize && !ArraySize->isTypeDependent()) {
  ExprResult ConvertedSize;
  if (getLangOpts().CPlusPlus14) {
    assert(Context.getTargetInfo().getIntWidth() && "Builtin type of size 0?")(static_cast <bool> (Context.getTargetInfo().getIntWidth
() && "Builtin type of size 0?") ? void (0) : __assert_fail
 ("Context.getTargetInfo().getIntWidth() && \"Builtin type of size 0?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 1845, __extension__ __PRETTY_FUNCTION__));

    ConvertedSize = PerformImplicitConversion(ArraySize, Context.getSizeType(),
				AA_Converting);

    if (!ConvertedSize.isInvalid() &&
        ArraySize->getType()->getAs<RecordType>())
      // Diagnose the compatibility of this conversion.
      Diag(StartLoc, diag::warn_cxx98_compat_array_size_conversion)
        << ArraySize->getType() << 0 << "'size_t'";
  } else {
    class SizeConvertDiagnoser : public ICEConvertDiagnoser {
    protected:
      Expr *ArraySize;

    public:
      SizeConvertDiagnoser(Expr *ArraySize)
          : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false, false, false),
            ArraySize(ArraySize) {}

      SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
                                           QualType T) override {
        return S.Diag(Loc, diag::err_array_size_not_integral)
                 << S.getLangOpts().CPlusPlus11 << T;
      }

      SemaDiagnosticBuilder diagnoseIncomplete(
          Sema &S, SourceLocation Loc, QualType T) override {
        return S.Diag(Loc, diag::err_array_size_incomplete_type)
                 << T << ArraySize->getSourceRange();
      }

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

      SemaDiagnosticBuilder noteExplicitConv(
          Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
        return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
                 << ConvTy->isEnumeralType() << ConvTy;
      }

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

      SemaDiagnosticBuilder noteAmbiguous(
          Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
        return S.Diag(Conv->getLocation(), diag::note_array_size_conversion)
                 << ConvTy->isEnumeralType() << ConvTy;
      }

      SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
                                               QualType T,
                                               QualType ConvTy) override {
        return S.Diag(Loc,
                      S.getLangOpts().CPlusPlus11
                        ? diag::warn_cxx98_compat_array_size_conversion
                        : diag::ext_array_size_conversion)
                 << T << ConvTy->isEnumeralType() << ConvTy;
      }
    } SizeDiagnoser(ArraySize);

    ConvertedSize = PerformContextualImplicitConversion(StartLoc, ArraySize,
                                                        SizeDiagnoser);
  }
  if (ConvertedSize.isInvalid())
    return ExprError();

  ArraySize = ConvertedSize.get();
  QualType SizeType = ArraySize->getType();

  if (!SizeType->isIntegralOrUnscopedEnumerationType())
    return ExprError();

  // C++98 [expr.new]p7:
  //   The expression in a direct-new-declarator shall have integral type
  //   with a non-negative value.
  //
  // Let's see if this is a constant < 0. If so, we reject it out of hand,
  // per CWG1464. Otherwise, if it's not a constant, we must have an
  // unparenthesized array type.
  if (!ArraySize->isValueDependent()) {
    llvm::APSInt Value;
    // We've already performed any required implicit conversion to integer or
    // unscoped enumeration type.
    // FIXME: Per CWG1464, we are required to check the value prior to
    // converting to size_t. This will never find a negative array size in
    // C++14 onwards, because Value is always unsigned here!
    if (ArraySize->isIntegerConstantExpr(Value, Context)) {
      if (Value.isSigned() && Value.isNegative()) {
        return ExprError(Diag(ArraySize->getLocStart(),
                              diag::err_typecheck_negative_array_size)
                         << ArraySize->getSourceRange());
      }

      if (!AllocType->isDependentType()) {
        unsigned ActiveSizeBits =
          ConstantArrayType::getNumAddressingBits(Context, AllocType, Value);
        if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context))
          return ExprError(Diag(ArraySize->getLocStart(),
                                diag::err_array_too_large)
                           << Value.toString(10)
                           << ArraySize->getSourceRange());
      }

      KnownArraySize = Value.getZExtValue();
    } else if (TypeIdParens.isValid()) {
      // Can't have dynamic array size when the type-id is in parentheses.
      Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst)
        << ArraySize->getSourceRange()
        << FixItHint::CreateRemoval(TypeIdParens.getBegin())
        << FixItHint::CreateRemoval(TypeIdParens.getEnd());

      TypeIdParens = SourceRange();
    }
  }

  // Note that we do *not* convert the argument in any way.  It can
  // be signed, larger than size_t, whatever.
}

FunctionDecl *OperatorNew = nullptr;
FunctionDecl *OperatorDelete = nullptr;
unsigned Alignment =
    AllocType->isDependentType() ? 0 : Context.getTypeAlign(AllocType);
unsigned NewAlignment = Context.getTargetInfo().getNewAlign();
bool PassAlignment = getLangOpts().AlignedAllocation &&
                     Alignment > NewAlignment;

if (!AllocType->isDependentType() &&
    !Expr::hasAnyTypeDependentArguments(PlacementArgs) &&
    FindAllocationFunctions(StartLoc,
                            SourceRange(PlacementLParen, PlacementRParen),
                            UseGlobal, AllocType, ArraySize, PassAlignment,
                            PlacementArgs, OperatorNew, OperatorDelete))
  return ExprError();

// If this is an array allocation, compute whether the usual array
// deallocation function for the type has a size_t parameter.
bool UsualArrayDeleteWantsSize = false;
if (ArraySize && !AllocType->isDependentType())
  UsualArrayDeleteWantsSize =
      doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType);

SmallVector<Expr *, 8> AllPlaceArgs;
if (OperatorNew) {
  const FunctionProtoType *Proto =
      OperatorNew->getType()->getAs<FunctionProtoType>();
  VariadicCallType CallType = Proto->isVariadic() ? VariadicFunction
                                                  : VariadicDoesNotApply;

  // We've already converted the placement args, just fill in any default
  // arguments. Skip the first parameter because we don't have a corresponding
  // argument. Skip the second parameter too if we're passing in the
  // alignment; we've already filled it in.
  if (GatherArgumentsForCall(PlacementLParen, OperatorNew, Proto,
                             PassAlignment ? 2 : 1, PlacementArgs,
                             AllPlaceArgs, CallType))
    return ExprError();

  if (!AllPlaceArgs.empty())
    PlacementArgs = AllPlaceArgs;

  // FIXME: This is wrong: PlacementArgs misses out the first (size) argument.
  DiagnoseSentinelCalls(OperatorNew, PlacementLParen, PlacementArgs);

  // FIXME: Missing call to CheckFunctionCall or equivalent

  // Warn if the type is over-aligned and is being allocated by (unaligned)
  // global operator new.
  if (PlacementArgs.empty() && !PassAlignment &&
      (OperatorNew->isImplicit() ||
       (OperatorNew->getLocStart().isValid() &&
        getSourceManager().isInSystemHeader(OperatorNew->getLocStart())))) {
    if (Alignment > NewAlignment)
      Diag(StartLoc, diag::warn_overaligned_type)
          << AllocType
          << unsigned(Alignment / Context.getCharWidth())
          << unsigned(NewAlignment / Context.getCharWidth());
  }
}

// Array 'new' can't have any initializers except empty parentheses.
// Initializer lists are also allowed, in C++11. Rely on the parser for the
// dialect distinction.
if (ArraySize && !isLegalArrayNewInitializer(initStyle, Initializer)) {
  SourceRange InitRange(Inits[0]->getLocStart(),
                        Inits[NumInits - 1]->getLocEnd());
  Diag(StartLoc, diag::err_new_array_init_args) << InitRange;
  return ExprError();
}

// If we can perform the initialization, and we've not already done so,
// do it now.
if (!AllocType->isDependentType() &&
    !Expr::hasAnyTypeDependentArguments(
        llvm::makeArrayRef(Inits, NumInits))) {
  // The type we initialize is the complete type, including the array bound.
  QualType InitType;
  if (KnownArraySize)
    InitType = Context.getConstantArrayType(
        AllocType, llvm::APInt(Context.getTypeSize(Context.getSizeType()),
                               *KnownArraySize),
        ArrayType::Normal, 0);
  else if (ArraySize)
    InitType =
        Context.getIncompleteArrayType(AllocType, ArrayType::Normal, 0);
  else
    InitType = AllocType;

  InitializedEntity Entity
    = InitializedEntity::InitializeNew(StartLoc, InitType);
  InitializationSequence InitSeq(*this, Entity, Kind,
                                 MultiExprArg(Inits, NumInits));
  ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind,
                                        MultiExprArg(Inits, NumInits));
  if (FullInit.isInvalid())
    return ExprError();

  // FullInit is our initializer; strip off CXXBindTemporaryExprs, because
  // we don't want the initialized object to be destructed.
  // FIXME: We should not create these in the first place.
  if (CXXBindTemporaryExpr *Binder =
          dyn_cast_or_null<CXXBindTemporaryExpr>(FullInit.get()))
    FullInit = Binder->getSubExpr();

  Initializer = FullInit.get();
}

// Mark the new and delete operators as referenced.
if (OperatorNew) {
  if (DiagnoseUseOfDecl(OperatorNew, StartLoc))
    return ExprError();
  MarkFunctionReferenced(StartLoc, OperatorNew);
  diagnoseUnavailableAlignedAllocation(*OperatorNew, StartLoc, false, *this);
}
if (OperatorDelete) {
  if (DiagnoseUseOfDecl(OperatorDelete, StartLoc))
    return ExprError();
  MarkFunctionReferenced(StartLoc, OperatorDelete);
  diagnoseUnavailableAlignedAllocation(*OperatorDelete, StartLoc, true, *this);
}

// C++0x [expr.new]p17:
//   If the new expression creates an array of objects of class type,
//   access and ambiguity control are done for the destructor.
QualType BaseAllocType = Context.getBaseElementType(AllocType);
if (ArraySize && !BaseAllocType->isDependentType()) {
  if (const RecordType *BaseRecordType = BaseAllocType->getAs<RecordType>()) {
    if (CXXDestructorDecl *dtor = LookupDestructor(
            cast<CXXRecordDecl>(BaseRecordType->getDecl()))) {
      MarkFunctionReferenced(StartLoc, dtor);
      CheckDestructorAccess(StartLoc, dtor,
                            PDiag(diag::err_access_dtor)
                              << BaseAllocType);
      if (DiagnoseUseOfDecl(dtor, StartLoc))
        return ExprError();
    }
  }
}

return new (Context)
    CXXNewExpr(Context, UseGlobal, OperatorNew, OperatorDelete, PassAlignment,
               UsualArrayDeleteWantsSize, PlacementArgs, TypeIdParens,
               ArraySize, initStyle, Initializer, ResultType, AllocTypeInfo,
               Range, DirectInitRange);
2114}

2116/// \brief Checks that a type is suitable as the allocated type
2117/// in a new-expression.
2118bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
                            SourceRange R) {
// C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
//   abstract class type or array thereof.
if (AllocType->isFunctionType())
  return Diag(Loc, diag::err_bad_new_type)
    << AllocType << 0 << R;
else if (AllocType->isReferenceType())
  return Diag(Loc, diag::err_bad_new_type)
    << AllocType << 1 << R;
else if (!AllocType->isDependentType() &&
         RequireCompleteType(Loc, AllocType, diag::err_new_incomplete_type,R))
  return true;
else if (RequireNonAbstractType(Loc, AllocType,
                                diag::err_allocation_of_abstract_type))
  return true;
else if (AllocType->isVariablyModifiedType())
  return Diag(Loc, diag::err_variably_modified_new_type)
           << AllocType;
else if (AllocType.getAddressSpace() != LangAS::Default)
  return Diag(Loc, diag::err_address_space_qualified_new)
    << AllocType.getUnqualifiedType()
    << AllocType.getQualifiers().getAddressSpaceAttributePrintValue();
else if (getLangOpts().ObjCAutoRefCount) {
  if (const ArrayType *AT = Context.getAsArrayType(AllocType)) {
    QualType BaseAllocType = Context.getBaseElementType(AT);
    if (BaseAllocType.getObjCLifetime() == Qualifiers::OCL_None &&
        BaseAllocType->isObjCLifetimeType())
      return Diag(Loc, diag::err_arc_new_array_without_ownership)
        << BaseAllocType;
  }
}

return false;
2152}

2154static bool resolveAllocationOverload(
  Sema &S, LookupResult &R, SourceRange Range, SmallVectorImpl<Expr *> &Args,
  bool &PassAlignment, FunctionDecl *&Operator,
  OverloadCandidateSet *AlignedCandidates, Expr *AlignArg, bool Diagnose) {
OverloadCandidateSet Candidates(R.getNameLoc(),
                                OverloadCandidateSet::CSK_Normal);
for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
     Alloc != AllocEnd; ++Alloc) {
  // Even member operator new/delete are implicitly treated as
  // static, so don't use AddMemberCandidate.
  NamedDecl *D = (*Alloc)->getUnderlyingDecl();

  if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) {
    S.AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(),
                                   /*ExplicitTemplateArgs=*/nullptr, Args,
                                   Candidates,
                                   /*SuppressUserConversions=*/false);
    continue;
  }

  FunctionDecl *Fn = cast<FunctionDecl>(D);
  S.AddOverloadCandidate(Fn, Alloc.getPair(), Args, Candidates,
                         /*SuppressUserConversions=*/false);
}

// Do the resolution.
OverloadCandidateSet::iterator Best;
switch (Candidates.BestViableFunction(S, R.getNameLoc(), Best)) {
case OR_Success: {
  // Got one!
  FunctionDecl *FnDecl = Best->Function;
  if (S.CheckAllocationAccess(R.getNameLoc(), Range, R.getNamingClass(),
                              Best->FoundDecl) == Sema::AR_inaccessible)
    return true;

  Operator = FnDecl;
  return false;
}

case OR_No_Viable_Function:
  // C++17 [expr.new]p13:
  //   If no matching function is found and the allocated object type has
  //   new-extended alignment, the alignment argument is removed from the
  //   argument list, and overload resolution is performed again.
  if (PassAlignment) {
    PassAlignment = false;
    AlignArg = Args[1];
    Args.erase(Args.begin() + 1);
    return resolveAllocationOverload(S, R, Range, Args, PassAlignment,
                                     Operator, &Candidates, AlignArg,
                                     Diagnose);
  }

  // MSVC will fall back on trying to find a matching global operator new
  // if operator new[] cannot be found.  Also, MSVC will leak by not
  // generating a call to operator delete or operator delete[], but we
  // will not replicate that bug.
  // FIXME: Find out how this interacts with the std::align_val_t fallback
  // once MSVC implements it.
  if (R.getLookupName().getCXXOverloadedOperator() == OO_Array_New &&
      S.Context.getLangOpts().MSVCCompat) {
    R.clear();
    R.setLookupName(S.Context.DeclarationNames.getCXXOperatorName(OO_New));
    S.LookupQualifiedName(R, S.Context.getTranslationUnitDecl());
    // FIXME: This will give bad diagnostics pointing at the wrong functions.
    return resolveAllocationOverload(S, R, Range, Args, PassAlignment,
                                     Operator, /*Candidates=*/nullptr,
                                     /*AlignArg=*/nullptr, Diagnose);
  }

  if (Diagnose) {
    S.Diag(R.getNameLoc(), diag::err_ovl_no_viable_function_in_call)
        << R.getLookupName() << Range;

    // If we have aligned candidates, only note the align_val_t candidates
    // from AlignedCandidates and the non-align_val_t candidates from
    // Candidates.
    if (AlignedCandidates) {
      auto IsAligned = [](OverloadCandidate &C) {
        return C.Function->getNumParams() > 1 &&
               C.Function->getParamDecl(1)->getType()->isAlignValT();
      };
      auto IsUnaligned = [&](OverloadCandidate &C) { return !IsAligned(C); };

      // This was an overaligned allocation, so list the aligned candidates
      // first.
      Args.insert(Args.begin() + 1, AlignArg);
      AlignedCandidates->NoteCandidates(S, OCD_AllCandidates, Args, "",
                                        R.getNameLoc(), IsAligned);
      Args.erase(Args.begin() + 1);
      Candidates.NoteCandidates(S, OCD_AllCandidates, Args, "", R.getNameLoc(),
                                IsUnaligned);
    } else {
      Candidates.NoteCandidates(S, OCD_AllCandidates, Args);
    }
  }
  return true;

case OR_Ambiguous:
  if (Diagnose) {
    S.Diag(R.getNameLoc(), diag::err_ovl_ambiguous_call)
        << R.getLookupName() << Range;
    Candidates.NoteCandidates(S, OCD_ViableCandidates, Args);
  }
  return true;

case OR_Deleted: {
  if (Diagnose) {
    S.Diag(R.getNameLoc(), diag::err_ovl_deleted_call)
        << Best->Function->isDeleted() << R.getLookupName()
        << S.getDeletedOrUnavailableSuffix(Best->Function) << Range;
    Candidates.NoteCandidates(S, OCD_AllCandidates, Args);
  }
  return true;
}
}
llvm_unreachable("Unreachable, bad result from BestViableFunction")::llvm::llvm_unreachable_internal("Unreachable, bad result from BestViableFunction"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2270);
2271}


2274/// FindAllocationFunctions - Finds the overloads of operator new and delete
2275/// that are appropriate for the allocation.
2276bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
                                 bool UseGlobal, QualType AllocType,
                                 bool IsArray, bool &PassAlignment,
                                 MultiExprArg PlaceArgs,
                                 FunctionDecl *&OperatorNew,
                                 FunctionDecl *&OperatorDelete,
                                 bool Diagnose) {
// --- Choosing an allocation function ---
// C++ 5.3.4p8 - 14 & 18
// 1) If UseGlobal is true, only look in the global scope. Else, also look
//   in the scope of the allocated class.
// 2) If an array size is given, look for operator new[], else look for
//   operator new.
// 3) The first argument is always size_t. Append the arguments from the
//   placement form.

SmallVector<Expr*, 8> AllocArgs;
AllocArgs.reserve((PassAlignment ? 2 : 1) + PlaceArgs.size());

// We don't care about the actual value of these arguments.
// FIXME: Should the Sema create the expression and embed it in the syntax
// tree? Or should the consumer just recalculate the value?
// FIXME: Using a dummy value will interact poorly with attribute enable_if.
IntegerLiteral Size(Context, llvm::APInt::getNullValue(
                    Context.getTargetInfo().getPointerWidth(0)),
                    Context.getSizeType(),
                    SourceLocation());
AllocArgs.push_back(&Size);

QualType AlignValT = Context.VoidTy;
if (PassAlignment) {
  DeclareGlobalNewDelete();
  AlignValT = Context.getTypeDeclType(getStdAlignValT());
}
CXXScalarValueInitExpr Align(AlignValT, nullptr, SourceLocation());
if (PassAlignment)
  AllocArgs.push_back(&Align);

AllocArgs.insert(AllocArgs.end(), PlaceArgs.begin(), PlaceArgs.end());

// C++ [expr.new]p8:
//   If the allocated type is a non-array type, the allocation
//   function's name is operator new and the deallocation function's
//   name is operator delete. If the allocated type is an array
//   type, the allocation function's name is operator new[] and the
//   deallocation function's name is operator delete[].
DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
    IsArray ? OO_Array_New : OO_New);

QualType AllocElemType = Context.getBaseElementType(AllocType);

// Find the allocation function.
{
  LookupResult R(*this, NewName, StartLoc, LookupOrdinaryName);

  // C++1z [expr.new]p9:
  //   If the new-expression begins with a unary :: operator, the allocation
  //   function's name is looked up in the global scope. Otherwise, if the
  //   allocated type is a class type T or array thereof, the allocation
  //   function's name is looked up in the scope of T.
  if (AllocElemType->isRecordType() && !UseGlobal)
    LookupQualifiedName(R, AllocElemType->getAsCXXRecordDecl());

  // We can see ambiguity here if the allocation function is found in
  // multiple base classes.
  if (R.isAmbiguous())
    return true;

  //   If this lookup fails to find the name, or if the allocated type is not
  //   a class type, the allocation function's name is looked up in the
  //   global scope.
  if (R.empty())
    LookupQualifiedName(R, Context.getTranslationUnitDecl());

  assert(!R.empty() && "implicitly declared allocation functions not found")(static_cast <bool> (!R.empty() && "implicitly declared allocation functions not found"
) ? void (0) : __assert_fail ("!R.empty() && \"implicitly declared allocation functions not found\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2350, __extension__ __PRETTY_FUNCTION__));
  assert(!R.isAmbiguous() && "global allocation functions are ambiguous")(static_cast <bool> (!R.isAmbiguous() && "global allocation functions are ambiguous"
) ? void (0) : __assert_fail ("!R.isAmbiguous() && \"global allocation functions are ambiguous\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2351, __extension__ __PRETTY_FUNCTION__));

  // We do our own custom access checks below.
  R.suppressDiagnostics();

  if (resolveAllocationOverload(*this, R, Range, AllocArgs, PassAlignment,
                                OperatorNew, /*Candidates=*/nullptr,
                                /*AlignArg=*/nullptr, Diagnose))
    return true;
}

// We don't need an operator delete if we're running under -fno-exceptions.
if (!getLangOpts().Exceptions) {
  OperatorDelete = nullptr;
  return false;
}

// Note, the name of OperatorNew might have been changed from array to
// non-array by resolveAllocationOverload.
DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
    OperatorNew->getDeclName().getCXXOverloadedOperator() == OO_Array_New
        ? OO_Array_Delete
        : OO_Delete);

// C++ [expr.new]p19:
//
//   If the new-expression begins with a unary :: operator, the
//   deallocation function's name is looked up in the global
//   scope. Otherwise, if the allocated type is a class type T or an
//   array thereof, the deallocation function's name is looked up in
//   the scope of T. If this lookup fails to find the name, or if
//   the allocated type is not a class type or array thereof, the
//   deallocation function's name is looked up in the global scope.
LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName);
if (AllocElemType->isRecordType() && !UseGlobal) {
  CXXRecordDecl *RD
    = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl());
  LookupQualifiedName(FoundDelete, RD);
}
if (FoundDelete.isAmbiguous())
  return true; // FIXME: clean up expressions?

bool FoundGlobalDelete = FoundDelete.empty();
if (FoundDelete.empty()) {
  DeclareGlobalNewDelete();
  LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());
}

FoundDelete.suppressDiagnostics();

SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches;

// Whether we're looking for a placement operator delete is dictated
// by whether we selected a placement operator new, not by whether
// we had explicit placement arguments.  This matters for things like
//   struct A { void *operator new(size_t, int = 0); ... };
//   A *a = new A()
//
// We don't have any definition for what a "placement allocation function"
// is, but we assume it's any allocation function whose
// parameter-declaration-clause is anything other than (size_t).
//
// FIXME: Should (size_t, std::align_val_t) also be considered non-placement?
// This affects whether an exception from the constructor of an overaligned
// type uses the sized or non-sized form of aligned operator delete.
bool isPlacementNew = !PlaceArgs.empty() || OperatorNew->param_size() != 1 ||
                      OperatorNew->isVariadic();

if (isPlacementNew) {
  // C++ [expr.new]p20:
  //   A declaration of a placement deallocation function matches the
  //   declaration of a placement allocation function if it has the
  //   same number of parameters and, after parameter transformations
  //   (8.3.5), all parameter types except the first are
  //   identical. [...]
  //
  // To perform this comparison, we compute the function type that
  // the deallocation function should have, and use that type both
  // for template argument deduction and for comparison purposes.
  QualType ExpectedFunctionType;
  {
    const FunctionProtoType *Proto
      = OperatorNew->getType()->getAs<FunctionProtoType>();

    SmallVector<QualType, 4> ArgTypes;
    ArgTypes.push_back(Context.VoidPtrTy);
    for (unsigned I = 1, N = Proto->getNumParams(); I < N; ++I)
      ArgTypes.push_back(Proto->getParamType(I));

    FunctionProtoType::ExtProtoInfo EPI;
    // FIXME: This is not part of the standard's rule.
    EPI.Variadic = Proto->isVariadic();

    ExpectedFunctionType
      = Context.getFunctionType(Context.VoidTy, ArgTypes, EPI);
  }

  for (LookupResult::iterator D = FoundDelete.begin(),
                           DEnd = FoundDelete.end();
       D != DEnd; ++D) {
    FunctionDecl *Fn = nullptr;
    if (FunctionTemplateDecl *FnTmpl =
            dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) {
      // Perform template argument deduction to try to match the
      // expected function type.
      TemplateDeductionInfo Info(StartLoc);
      if (DeduceTemplateArguments(FnTmpl, nullptr, ExpectedFunctionType, Fn,
                                  Info))
        continue;
    } else
      Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl());

    if (Context.hasSameType(adjustCCAndNoReturn(Fn->getType(),
                                                ExpectedFunctionType,
                                                /*AdjustExcpetionSpec*/true),
                            ExpectedFunctionType))
      Matches.push_back(std::make_pair(D.getPair(), Fn));
  }

  if (getLangOpts().CUDA)
    EraseUnwantedCUDAMatches(dyn_cast<FunctionDecl>(CurContext), Matches);
} else {
  // C++1y [expr.new]p22:
  //   For a non-placement allocation function, the normal deallocation
  //   function lookup is used
  //
  // Per [expr.delete]p10, this lookup prefers a member operator delete
  // without a size_t argument, but prefers a non-member operator delete
  // with a size_t where possible (which it always is in this case).
  llvm::SmallVector<UsualDeallocFnInfo, 4> BestDeallocFns;
  UsualDeallocFnInfo Selected = resolveDeallocationOverload(
      *this, FoundDelete, /*WantSize*/ FoundGlobalDelete,
      /*WantAlign*/ hasNewExtendedAlignment(*this, AllocElemType),
      &BestDeallocFns);
  if (Selected)
    Matches.push_back(std::make_pair(Selected.Found, Selected.FD));
  else {
    // If we failed to select an operator, all remaining functions are viable
    // but ambiguous.
    for (auto Fn : BestDeallocFns)
      Matches.push_back(std::make_pair(Fn.Found, Fn.FD));
  }
}

// C++ [expr.new]p20:
//   [...] If the lookup finds a single matching deallocation
//   function, that function will be called; otherwise, no
//   deallocation function will be called.
if (Matches.size() == 1) {
  OperatorDelete = Matches[0].second;

  // C++1z [expr.new]p23:
  //   If the lookup finds a usual deallocation function (3.7.4.2)
  //   with a parameter of type std::size_t and that function, considered
  //   as a placement deallocation function, would have been
  //   selected as a match for the allocation function, the program
  //   is ill-formed.
  if (getLangOpts().CPlusPlus11 && isPlacementNew &&
      isNonPlacementDeallocationFunction(*this, OperatorDelete)) {
    UsualDeallocFnInfo Info(*this,
                            DeclAccessPair::make(OperatorDelete, AS_public));
    // Core issue, per mail to core reflector, 2016-10-09:
    //   If this is a member operator delete, and there is a corresponding
    //   non-sized member operator delete, this isn't /really/ a sized
    //   deallocation function, it just happens to have a size_t parameter.
    bool IsSizedDelete = Info.HasSizeT;
    if (IsSizedDelete && !FoundGlobalDelete) {
      auto NonSizedDelete =
          resolveDeallocationOverload(*this, FoundDelete, /*WantSize*/false,
                                      /*WantAlign*/Info.HasAlignValT);
      if (NonSizedDelete && !NonSizedDelete.HasSizeT &&
          NonSizedDelete.HasAlignValT == Info.HasAlignValT)
        IsSizedDelete = false;
    }

    if (IsSizedDelete) {
      SourceRange R = PlaceArgs.empty()
                          ? SourceRange()
                          : SourceRange(PlaceArgs.front()->getLocStart(),
                                        PlaceArgs.back()->getLocEnd());
      Diag(StartLoc, diag::err_placement_new_non_placement_delete) << R;
      if (!OperatorDelete->isImplicit())
        Diag(OperatorDelete->getLocation(), diag::note_previous_decl)
            << DeleteName;
    }
  }

  CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(),
                        Matches[0].first);
} else if (!Matches.empty()) {
  // We found multiple suitable operators. Per [expr.new]p20, that means we
  // call no 'operator delete' function, but we should at least warn the user.
  // FIXME: Suppress this warning if the construction cannot throw.
  Diag(StartLoc, diag::warn_ambiguous_suitable_delete_function_found)
    << DeleteName << AllocElemType;

  for (auto &Match : Matches)
    Diag(Match.second->getLocation(),
         diag::note_member_declared_here) << DeleteName;
}

return false;
2553}

2555/// DeclareGlobalNewDelete - Declare the global forms of operator new and
2556/// delete. These are:
2557/// @code
2558///   // C++03:
2559///   void* operator new(std::size_t) throw(std::bad_alloc);
2560///   void* operator new[](std::size_t) throw(std::bad_alloc);
2561///   void operator delete(void *) throw();
2562///   void operator delete[](void *) throw();
2563///   // C++11:
2564///   void* operator new(std::size_t);
2565///   void* operator new[](std::size_t);
2566///   void operator delete(void *) noexcept;
2567///   void operator delete[](void *) noexcept;
2568///   // C++1y:
2569///   void* operator new(std::size_t);
2570///   void* operator new[](std::size_t);
2571///   void operator delete(void *) noexcept;
2572///   void operator delete[](void *) noexcept;
2573///   void operator delete(void *, std::size_t) noexcept;
2574///   void operator delete[](void *, std::size_t) noexcept;
2575/// @endcode
2576/// Note that the placement and nothrow forms of new are *not* implicitly
2577/// declared. Their use requires including \<new\>.
2578void Sema::DeclareGlobalNewDelete() {
if (GlobalNewDeleteDeclared)
  return;

// C++ [basic.std.dynamic]p2:
//   [...] The following allocation and deallocation functions (18.4) are
//   implicitly declared in global scope in each translation unit of a
//   program
//
//     C++03:
//     void* operator new(std::size_t) throw(std::bad_alloc);
//     void* operator new[](std::size_t) throw(std::bad_alloc);
//     void  operator delete(void*) throw();
//     void  operator delete[](void*) throw();
//     C++11:
//     void* operator new(std::size_t);
//     void* operator new[](std::size_t);
//     void  operator delete(void*) noexcept;
//     void  operator delete[](void*) noexcept;
//     C++1y:
//     void* operator new(std::size_t);
//     void* operator new[](std::size_t);
//     void  operator delete(void*) noexcept;
//     void  operator delete[](void*) noexcept;
//     void  operator delete(void*, std::size_t) noexcept;
//     void  operator delete[](void*, std::size_t) noexcept;
//
//   These implicit declarations introduce only the function names operator
//   new, operator new[], operator delete, operator delete[].
//
// Here, we need to refer to std::bad_alloc, so we will implicitly declare
// "std" or "bad_alloc" as necessary to form the exception specification.
// However, we do not make these implicit declarations visible to name
// lookup.
if (!StdBadAlloc && !getLangOpts().CPlusPlus11) {
  // The "std::bad_alloc" class has not yet been declared, so build it
  // implicitly.
  StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
                                      getOrCreateStdNamespace(),
                                      SourceLocation(), SourceLocation(),
                                    &PP.getIdentifierTable().get("bad_alloc"),
                                      nullptr);
  getStdBadAlloc()->setImplicit(true);
}
if (!StdAlignValT && getLangOpts().AlignedAllocation) {
  // The "std::align_val_t" enum class has not yet been declared, so build it
  // implicitly.
  auto *AlignValT = EnumDecl::Create(
      Context, getOrCreateStdNamespace(), SourceLocation(), SourceLocation(),
      &PP.getIdentifierTable().get("align_val_t"), nullptr, true, true, true);
  AlignValT->setIntegerType(Context.getSizeType());
  AlignValT->setPromotionType(Context.getSizeType());
  AlignValT->setImplicit(true);
  StdAlignValT = AlignValT;
}

GlobalNewDeleteDeclared = true;

QualType VoidPtr = Context.getPointerType(Context.VoidTy);
QualType SizeT = Context.getSizeType();

auto DeclareGlobalAllocationFunctions = [&](OverloadedOperatorKind Kind,
                                            QualType Return, QualType Param) {
  llvm::SmallVector<QualType, 3> Params;
  Params.push_back(Param);

  // Create up to four variants of the function (sized/aligned).
  bool HasSizedVariant = getLangOpts().SizedDeallocation &&
                         (Kind == OO_Delete || Kind == OO_Array_Delete);
  bool HasAlignedVariant = getLangOpts().AlignedAllocation;

  int NumSizeVariants = (HasSizedVariant ? 2 : 1);
  int NumAlignVariants = (HasAlignedVariant ? 2 : 1);
  for (int Sized = 0; Sized < NumSizeVariants; ++Sized) {
    if (Sized)
      Params.push_back(SizeT);

    for (int Aligned = 0; Aligned < NumAlignVariants; ++Aligned) {
      if (Aligned)
        Params.push_back(Context.getTypeDeclType(getStdAlignValT()));

      DeclareGlobalAllocationFunction(
          Context.DeclarationNames.getCXXOperatorName(Kind), Return, Params);

      if (Aligned)
        Params.pop_back();
    }
  }
};

DeclareGlobalAllocationFunctions(OO_New, VoidPtr, SizeT);
DeclareGlobalAllocationFunctions(OO_Array_New, VoidPtr, SizeT);
DeclareGlobalAllocationFunctions(OO_Delete, Context.VoidTy, VoidPtr);
DeclareGlobalAllocationFunctions(OO_Array_Delete, Context.VoidTy, VoidPtr);
2672}

2674/// DeclareGlobalAllocationFunction - Declares a single implicit global
2675/// allocation function if it doesn't already exist.
2676void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
                                         QualType Return,
                                         ArrayRef<QualType> Params) {
DeclContext *GlobalCtx = Context.getTranslationUnitDecl();

// Check if this function is already declared.
DeclContext::lookup_result R = GlobalCtx->lookup(Name);
for (DeclContext::lookup_iterator Alloc = R.begin(), AllocEnd = R.end();
     Alloc != AllocEnd; ++Alloc) {
  // Only look at non-template functions, as it is the predefined,
  // non-templated allocation function we are trying to declare here.
  if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) {
    if (Func->getNumParams() == Params.size()) {
      llvm::SmallVector<QualType, 3> FuncParams;
      for (auto *P : Func->parameters())
        FuncParams.push_back(
            Context.getCanonicalType(P->getType().getUnqualifiedType()));
      if (llvm::makeArrayRef(FuncParams) == Params) {
        // Make the function visible to name lookup, even if we found it in
        // an unimported module. It either is an implicitly-declared global
        // allocation function, or is suppressing that function.
        Func->setVisibleDespiteOwningModule();
        return;
      }
    }
  }
}

FunctionProtoType::ExtProtoInfo EPI;

QualType BadAllocType;
bool HasBadAllocExceptionSpec
  = (Name.getCXXOverloadedOperator() == OO_New ||
     Name.getCXXOverloadedOperator() == OO_Array_New);
if (HasBadAllocExceptionSpec) {
  if (!getLangOpts().CPlusPlus11) {
    BadAllocType = Context.getTypeDeclType(getStdBadAlloc());
    assert(StdBadAlloc && "Must have std::bad_alloc declared")(static_cast <bool> (StdBadAlloc && "Must have std::bad_alloc declared"
) ? void (0) : __assert_fail ("StdBadAlloc && \"Must have std::bad_alloc declared\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2713, __extension__ __PRETTY_FUNCTION__));
    EPI.ExceptionSpec.Type = EST_Dynamic;
    EPI.ExceptionSpec.Exceptions = llvm::makeArrayRef(BadAllocType);
  }
} else {
  EPI.ExceptionSpec =
      getLangOpts().CPlusPlus11 ? EST_BasicNoexcept : EST_DynamicNone;
}

auto CreateAllocationFunctionDecl = [&](Attr *ExtraAttr) {
  QualType FnType = Context.getFunctionType(Return, Params, EPI);
  FunctionDecl *Alloc = FunctionDecl::Create(
      Context, GlobalCtx, SourceLocation(), SourceLocation(), Name,
      FnType, /*TInfo=*/nullptr, SC_None, false, true);
  Alloc->setImplicit();
  // Global allocation functions should always be visible.
  Alloc->setVisibleDespiteOwningModule();

  // Implicit sized deallocation functions always have default visibility.
  Alloc->addAttr(
      VisibilityAttr::CreateImplicit(Context, VisibilityAttr::Default));

  llvm::SmallVector<ParmVarDecl *, 3> ParamDecls;
  for (QualType T : Params) {
    ParamDecls.push_back(ParmVarDecl::Create(
        Context, Alloc, SourceLocation(), SourceLocation(), nullptr, T,
        /*TInfo=*/nullptr, SC_None, nullptr));
    ParamDecls.back()->setImplicit();
  }
  Alloc->setParams(ParamDecls);
  if (ExtraAttr)
    Alloc->addAttr(ExtraAttr);
  Context.getTranslationUnitDecl()->addDecl(Alloc);
  IdResolver.tryAddTopLevelDecl(Alloc, Name);
};

if (!LangOpts.CUDA)
  CreateAllocationFunctionDecl(nullptr);
else {
  // Host and device get their own declaration so each can be
  // defined or re-declared independently.
  CreateAllocationFunctionDecl(CUDAHostAttr::CreateImplicit(Context));
  CreateAllocationFunctionDecl(CUDADeviceAttr::CreateImplicit(Context));
}
2757}

2759FunctionDecl *Sema::FindUsualDeallocationFunction(SourceLocation StartLoc,
                                                bool CanProvideSize,
                                                bool Overaligned,
                                                DeclarationName Name) {
DeclareGlobalNewDelete();

LookupResult FoundDelete(*this, Name, StartLoc, LookupOrdinaryName);
LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl());

// FIXME: It's possible for this to result in ambiguity, through a
// user-declared variadic operator delete or the enable_if attribute. We
// should probably not consider those cases to be usual deallocation
// functions. But for now we just make an arbitrary choice in that case.
auto Result = resolveDeallocationOverload(*this, FoundDelete, CanProvideSize,
                                          Overaligned);
assert(Result.FD && "operator delete missing from global scope?")(static_cast <bool> (Result.FD && "operator delete missing from global scope?"
) ? void (0) : __assert_fail ("Result.FD && \"operator delete missing from global scope?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2774, __extension__ __PRETTY_FUNCTION__));
return Result.FD;
2776}

2778FunctionDecl *Sema::FindDeallocationFunctionForDestructor(SourceLocation Loc,
                                                        CXXRecordDecl *RD) {
DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Delete);

FunctionDecl *OperatorDelete = nullptr;
if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete))
  return nullptr;
if (OperatorDelete)
  return OperatorDelete;

// If there's no class-specific operator delete, look up the global
// non-array delete.
return FindUsualDeallocationFunction(
    Loc, true, hasNewExtendedAlignment(*this, Context.getRecordType(RD)),
    Name);
2793}

2795bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
                                  DeclarationName Name,
                                  FunctionDecl *&Operator, bool Diagnose) {
LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
// Try to find operator delete/operator delete[] in class scope.
LookupQualifiedName(Found, RD);

if (Found.isAmbiguous())
  return true;

Found.suppressDiagnostics();

bool Overaligned = hasNewExtendedAlignment(*this, Context.getRecordType(RD));

// C++17 [expr.delete]p10:
//   If the deallocation functions have class scope, the one without a
//   parameter of type std::size_t is selected.
llvm::SmallVector<UsualDeallocFnInfo, 4> Matches;
resolveDeallocationOverload(*this, Found, /*WantSize*/ false,
                            /*WantAlign*/ Overaligned, &Matches);

// If we could find an overload, use it.
if (Matches.size() == 1) {
  Operator = cast<CXXMethodDecl>(Matches[0].FD);

  // FIXME: DiagnoseUseOfDecl?
  if (Operator->isDeleted()) {
    if (Diagnose) {
      Diag(StartLoc, diag::err_deleted_function_use);
      NoteDeletedFunction(Operator);
    }
    return true;
  }

  if (CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(),
                            Matches[0].Found, Diagnose) == AR_inaccessible)
    return true;

  return false;
}

// We found multiple suitable operators; complain about the ambiguity.
// FIXME: The standard doesn't say to do this; it appears that the intent
// is that this should never happen.
if (!Matches.empty()) {
  if (Diagnose) {
    Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found)
      << Name << RD;
    for (auto &Match : Matches)
      Diag(Match.FD->getLocation(), diag::note_member_declared_here) << Name;
  }
  return true;
}

// We did find operator delete/operator delete[] declarations, but
// none of them were suitable.
if (!Found.empty()) {
  if (Diagnose) {
    Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
      << Name << RD;

    for (NamedDecl *D : Found)
      Diag(D->getUnderlyingDecl()->getLocation(),
           diag::note_member_declared_here) << Name;
  }
  return true;
}

Operator = nullptr;
return false;
2865}

2867namespace {
2868/// \brief Checks whether delete-expression, and new-expression used for
2869///  initializing deletee have the same array form.
2870class MismatchingNewDeleteDetector {
2871public:
enum MismatchResult {
  /// Indicates that there is no mismatch or a mismatch cannot be proven.
  NoMismatch,
  /// Indicates that variable is initialized with mismatching form of \a new.
  VarInitMismatches,
  /// Indicates that member is initialized with mismatching form of \a new.
  MemberInitMismatches,
  /// Indicates that 1 or more constructors' definitions could not been
  /// analyzed, and they will be checked again at the end of translation unit.
  AnalyzeLater
};

/// \param EndOfTU True, if this is the final analysis at the end of
/// translation unit. False, if this is the initial analysis at the point
/// delete-expression was encountered.
explicit MismatchingNewDeleteDetector(bool EndOfTU)
    : Field(nullptr), IsArrayForm(false), EndOfTU(EndOfTU),
      HasUndefinedConstructors(false) {}

/// \brief Checks whether pointee of a delete-expression is initialized with
/// matching form of new-expression.
///
/// If return value is \c VarInitMismatches or \c MemberInitMismatches at the
/// point where delete-expression is encountered, then a warning will be
/// issued immediately. If return value is \c AnalyzeLater at the point where
/// delete-expression is seen, then member will be analyzed at the end of
/// translation unit. \c AnalyzeLater is returned iff at least one constructor
/// couldn't be analyzed. If at least one constructor initializes the member
/// with matching type of new, the return value is \c NoMismatch.
MismatchResult analyzeDeleteExpr(const CXXDeleteExpr *DE);
/// \brief Analyzes a class member.
/// \param Field Class member to analyze.
/// \param DeleteWasArrayForm Array form-ness of the delete-expression used
/// for deleting the \p Field.
MismatchResult analyzeField(FieldDecl *Field, bool DeleteWasArrayForm);
FieldDecl *Field;
/// List of mismatching new-expressions used for initialization of the pointee
llvm::SmallVector<const CXXNewExpr *, 4> NewExprs;
/// Indicates whether delete-expression was in array form.
bool IsArrayForm;

2913private:
const bool EndOfTU;
/// \brief Indicates that there is at least one constructor without body.
bool HasUndefinedConstructors;
/// \brief Returns \c CXXNewExpr from given initialization expression.
/// \param E Expression used for initializing pointee in delete-expression.
/// E can be a single-element \c InitListExpr consisting of new-expression.
const CXXNewExpr *getNewExprFromInitListOrExpr(const Expr *E);
/// \brief Returns whether member is initialized with mismatching form of
/// \c new either by the member initializer or in-class initialization.
///
/// If bodies of all constructors are not visible at the end of translation
/// unit or at least one constructor initializes member with the matching
/// form of \c new, mismatch cannot be proven, and this function will return
/// \c NoMismatch.
MismatchResult analyzeMemberExpr(const MemberExpr *ME);
/// \brief Returns whether variable is initialized with mismatching form of
/// \c new.
///
/// If variable is initialized with matching form of \c new or variable is not
/// initialized with a \c new expression, this function will return true.
/// If variable is initialized with mismatching form of \c new, returns false.
/// \param D Variable to analyze.
bool hasMatchingVarInit(const DeclRefExpr *D);
/// \brief Checks whether the constructor initializes pointee with mismatching
/// form of \c new.
///
/// Returns true, if member is initialized with matching form of \c new in
/// member initializer list. Returns false, if member is initialized with the
/// matching form of \c new in this constructor's initializer or given
/// constructor isn't defined at the point where delete-expression is seen, or
/// member isn't initialized by the constructor.
bool hasMatchingNewInCtor(const CXXConstructorDecl *CD);
/// \brief Checks whether member is initialized with matching form of
/// \c new in member initializer list.
bool hasMatchingNewInCtorInit(const CXXCtorInitializer *CI);
/// Checks whether member is initialized with mismatching form of \c new by
/// in-class initializer.
MismatchResult analyzeInClassInitializer();
2952};
2953}

2955MismatchingNewDeleteDetector::MismatchResult
2956MismatchingNewDeleteDetector::analyzeDeleteExpr(const CXXDeleteExpr *DE) {
NewExprs.clear();
assert(DE && "Expected delete-expression")(static_cast <bool> (DE && "Expected delete-expression"
) ? void (0) : __assert_fail ("DE && \"Expected delete-expression\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2958, __extension__ __PRETTY_FUNCTION__));
IsArrayForm = DE->isArrayForm();
const Expr *E = DE->getArgument()->IgnoreParenImpCasts();
if (const MemberExpr *ME = dyn_cast<const MemberExpr>(E)) {
  return analyzeMemberExpr(ME);
} else if (const DeclRefExpr *D = dyn_cast<const DeclRefExpr>(E)) {
  if (!hasMatchingVarInit(D))
    return VarInitMismatches;
}
return NoMismatch;
2968}

2970const CXXNewExpr *
2971MismatchingNewDeleteDetector::getNewExprFromInitListOrExpr(const Expr *E) {
assert(E != nullptr && "Expected a valid initializer expression")(static_cast <bool> (E != nullptr && "Expected a valid initializer expression"
) ? void (0) : __assert_fail ("E != nullptr && \"Expected a valid initializer expression\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 2972, __extension__ __PRETTY_FUNCTION__));
E = E->IgnoreParenImpCasts();
if (const InitListExpr *ILE = dyn_cast<const InitListExpr>(E)) {
  if (ILE->getNumInits() == 1)
    E = dyn_cast<const CXXNewExpr>(ILE->getInit(0)->IgnoreParenImpCasts());
}

return dyn_cast_or_null<const CXXNewExpr>(E);
2980}

2982bool MismatchingNewDeleteDetector::hasMatchingNewInCtorInit(
  const CXXCtorInitializer *CI) {
const CXXNewExpr *NE = nullptr;
if (Field == CI->getMember() &&
    (NE = getNewExprFromInitListOrExpr(CI->getInit()))) {
  if (NE->isArray() == IsArrayForm)
    return true;
  else
    NewExprs.push_back(NE);
}
return false;
2993}

2995bool MismatchingNewDeleteDetector::hasMatchingNewInCtor(
  const CXXConstructorDecl *CD) {
if (CD->isImplicit())
  return false;
const FunctionDecl *Definition = CD;
if (!CD->isThisDeclarationADefinition() && !CD->isDefined(Definition)) {
  HasUndefinedConstructors = true;
  return EndOfTU;
}
for (const auto *CI : cast<const CXXConstructorDecl>(Definition)->inits()) {
  if (hasMatchingNewInCtorInit(CI))
    return true;
}
return false;
3009}

3011MismatchingNewDeleteDetector::MismatchResult
3012MismatchingNewDeleteDetector::analyzeInClassInitializer() {
assert(Field != nullptr && "This should be called only for members")(static_cast <bool> (Field != nullptr && "This should be called only for members"
) ? void (0) : __assert_fail ("Field != nullptr && \"This should be called only for members\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3013, __extension__ __PRETTY_FUNCTION__));
const Expr *InitExpr = Field->getInClassInitializer();
if (!InitExpr)
  return EndOfTU ? NoMismatch : AnalyzeLater;
if (const CXXNewExpr *NE = getNewExprFromInitListOrExpr(InitExpr)) {
  if (NE->isArray() != IsArrayForm) {
    NewExprs.push_back(NE);
    return MemberInitMismatches;
  }
}
return NoMismatch;
3024}

3026MismatchingNewDeleteDetector::MismatchResult
3027MismatchingNewDeleteDetector::analyzeField(FieldDecl *Field,
                                         bool DeleteWasArrayForm) {
assert(Field != nullptr && "Analysis requires a valid class member.")(static_cast <bool> (Field != nullptr && "Analysis requires a valid class member."
) ? void (0) : __assert_fail ("Field != nullptr && \"Analysis requires a valid class member.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3029, __extension__ __PRETTY_FUNCTION__));
this->Field = Field;
IsArrayForm = DeleteWasArrayForm;
const CXXRecordDecl *RD = cast<const CXXRecordDecl>(Field->getParent());
for (const auto *CD : RD->ctors()) {
  if (hasMatchingNewInCtor(CD))
    return NoMismatch;
}
if (HasUndefinedConstructors)
  return EndOfTU ? NoMismatch : AnalyzeLater;
if (!NewExprs.empty())
  return MemberInitMismatches;
return Field->hasInClassInitializer() ? analyzeInClassInitializer()
                                      : NoMismatch;
3043}

3045MismatchingNewDeleteDetector::MismatchResult
3046MismatchingNewDeleteDetector::analyzeMemberExpr(const MemberExpr *ME) {
assert(ME != nullptr && "Expected a member expression")(static_cast <bool> (ME != nullptr && "Expected a member expression"
) ? void (0) : __assert_fail ("ME != nullptr && \"Expected a member expression\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3047, __extension__ __PRETTY_FUNCTION__));
if (FieldDecl *F = dyn_cast<FieldDecl>(ME->getMemberDecl()))
  return analyzeField(F, IsArrayForm);
return NoMismatch;
3051}

3053bool MismatchingNewDeleteDetector::hasMatchingVarInit(const DeclRefExpr *D) {
const CXXNewExpr *NE = nullptr;
if (const VarDecl *VD = dyn_cast<const VarDecl>(D->getDecl())) {
  if (VD->hasInit() && (NE = getNewExprFromInitListOrExpr(VD->getInit())) &&
      NE->isArray() != IsArrayForm) {
    NewExprs.push_back(NE);
  }
}
return NewExprs.empty();
3062}

3064static void
3065DiagnoseMismatchedNewDelete(Sema &SemaRef, SourceLocation DeleteLoc,
                          const MismatchingNewDeleteDetector &Detector) {
SourceLocation EndOfDelete = SemaRef.getLocForEndOfToken(DeleteLoc);
FixItHint H;
if (!Detector.IsArrayForm)
  H = FixItHint::CreateInsertion(EndOfDelete, "[]");
else {
  SourceLocation RSquare = Lexer::findLocationAfterToken(
      DeleteLoc, tok::l_square, SemaRef.getSourceManager(),
      SemaRef.getLangOpts(), true);
  if (RSquare.isValid())
    H = FixItHint::CreateRemoval(SourceRange(EndOfDelete, RSquare));
}
SemaRef.Diag(DeleteLoc, diag::warn_mismatched_delete_new)
    << Detector.IsArrayForm << H;

for (const auto *NE : Detector.NewExprs)
  SemaRef.Diag(NE->getExprLoc(), diag::note_allocated_here)
      << Detector.IsArrayForm;
3084}

3086void Sema::AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE) {
if (Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation()))
  return;
MismatchingNewDeleteDetector Detector(/*EndOfTU=*/false);
switch (Detector.analyzeDeleteExpr(DE)) {
case MismatchingNewDeleteDetector::VarInitMismatches:
case MismatchingNewDeleteDetector::MemberInitMismatches: {
  DiagnoseMismatchedNewDelete(*this, DE->getLocStart(), Detector);
  break;
}
case MismatchingNewDeleteDetector::AnalyzeLater: {
  DeleteExprs[Detector.Field].push_back(
      std::make_pair(DE->getLocStart(), DE->isArrayForm()));
  break;
}
case MismatchingNewDeleteDetector::NoMismatch:
  break;
}
3104}

3106void Sema::AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
                                   bool DeleteWasArrayForm) {
MismatchingNewDeleteDetector Detector(/*EndOfTU=*/true);
switch (Detector.analyzeField(Field, DeleteWasArrayForm)) {
case MismatchingNewDeleteDetector::VarInitMismatches:
  llvm_unreachable("This analysis should have been done for class members.")::llvm::llvm_unreachable_internal("This analysis should have been done for class members."
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3111);
case MismatchingNewDeleteDetector::AnalyzeLater:
  llvm_unreachable("Analysis cannot be postponed any point beyond end of "::llvm::llvm_unreachable_internal("Analysis cannot be postponed any point beyond end of "
 "translation unit.", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3114)
                   "translation unit.")::llvm::llvm_unreachable_internal("Analysis cannot be postponed any point beyond end of "
 "translation unit.", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3114);
case MismatchingNewDeleteDetector::MemberInitMismatches:
  DiagnoseMismatchedNewDelete(*this, DeleteLoc, Detector);
  break;
case MismatchingNewDeleteDetector::NoMismatch:
  break;
}
3121}

3123/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
3124/// @code ::delete ptr; @endcode
3125/// or
3126/// @code delete [] ptr; @endcode
3127ExprResult
3128Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
                   bool ArrayForm, Expr *ExE) {
// C++ [expr.delete]p1:
//   The operand shall have a pointer type, or a class type having a single
//   non-explicit conversion function to a pointer type. The result has type
//   void.
//
// DR599 amends "pointer type" to "pointer to object type" in both cases.

ExprResult Ex = ExE;
FunctionDecl *OperatorDelete = nullptr;
bool ArrayFormAsWritten = ArrayForm;
bool UsualArrayDeleteWantsSize = false;

if (!Ex.get()->isTypeDependent()) {
  // Perform lvalue-to-rvalue cast, if needed.
  Ex = DefaultLvalueConversion(Ex.get());
  if (Ex.isInvalid())
    return ExprError();

  QualType Type = Ex.get()->getType();

  class DeleteConverter : public ContextualImplicitConverter {
  public:
    DeleteConverter() : ContextualImplicitConverter(false, true) {}

    bool match(QualType ConvType) override {
      // FIXME: If we have an operator T* and an operator void*, we must pick
      // the operator T*.
      if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
        if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType())
          return true;
      return false;
    }

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

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

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

    SemaDiagnosticBuilder noteExplicitConv(Sema &S, CXXConversionDecl *Conv,
                                           QualType ConvTy) override {
      return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
        << ConvTy;
    }

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

    SemaDiagnosticBuilder noteAmbiguous(Sema &S, CXXConversionDecl *Conv,
                                        QualType ConvTy) override {
      return S.Diag(Conv->getLocation(), diag::note_delete_conversion)
        << ConvTy;
    }

    SemaDiagnosticBuilder diagnoseConversion(Sema &S, SourceLocation Loc,
                                             QualType T,
                                             QualType ConvTy) override {
      llvm_unreachable("conversion functions are permitted")::llvm::llvm_unreachable_internal("conversion functions are permitted"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3199);
    }
  } Converter;

  Ex = PerformContextualImplicitConversion(StartLoc, Ex.get(), Converter);
  if (Ex.isInvalid())
    return ExprError();
  Type = Ex.get()->getType();
  if (!Converter.match(Type))
    // FIXME: PerformContextualImplicitConversion should return ExprError
    //        itself in this case.
    return ExprError();

  QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
  QualType PointeeElem = Context.getBaseElementType(Pointee);

  if (Pointee.getAddressSpace() != LangAS::Default)
    return Diag(Ex.get()->getLocStart(),
                diag::err_address_space_qualified_delete)
             << Pointee.getUnqualifiedType()
             << Pointee.getQualifiers().getAddressSpaceAttributePrintValue();

  CXXRecordDecl *PointeeRD = nullptr;
  if (Pointee->isVoidType() && !isSFINAEContext()) {
    // The C++ standard bans deleting a pointer to a non-object type, which
    // effectively bans deletion of "void*". However, most compilers support
    // this, so we treat it as a warning unless we're in a SFINAE context.
    Diag(StartLoc, diag::ext_delete_void_ptr_operand)
      << Type << Ex.get()->getSourceRange();
  } else if (Pointee->isFunctionType() || Pointee->isVoidType()) {
    return ExprError(Diag(StartLoc, diag::err_delete_operand)
      << Type << Ex.get()->getSourceRange());
  } else if (!Pointee->isDependentType()) {
    // FIXME: This can result in errors if the definition was imported from a
    // module but is hidden.
    if (!RequireCompleteType(StartLoc, Pointee,
                             diag::warn_delete_incomplete, Ex.get())) {
      if (const RecordType *RT = PointeeElem->getAs<RecordType>())
        PointeeRD = cast<CXXRecordDecl>(RT->getDecl());
    }
  }

  if (Pointee->isArrayType() && !ArrayForm) {
    Diag(StartLoc, diag::warn_delete_array_type)
        << Type << Ex.get()->getSourceRange()
        << FixItHint::CreateInsertion(getLocForEndOfToken(StartLoc), "[]");
    ArrayForm = true;
  }

  DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
                                    ArrayForm ? OO_Array_Delete : OO_Delete);

  if (PointeeRD) {
    if (!UseGlobal &&
        FindDeallocationFunction(StartLoc, PointeeRD, DeleteName,
                                 OperatorDelete))
      return ExprError();

    // If we're allocating an array of records, check whether the
    // usual operator delete[] has a size_t parameter.
    if (ArrayForm) {
      // If the user specifically asked to use the global allocator,
      // we'll need to do the lookup into the class.
      if (UseGlobal)
        UsualArrayDeleteWantsSize =
          doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem);

      // Otherwise, the usual operator delete[] should be the
      // function we just found.
      else if (OperatorDelete && isa<CXXMethodDecl>(OperatorDelete))
        UsualArrayDeleteWantsSize =
          UsualDeallocFnInfo(*this,
                             DeclAccessPair::make(OperatorDelete, AS_public))
            .HasSizeT;
    }

    if (!PointeeRD->hasIrrelevantDestructor())
      if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
        MarkFunctionReferenced(StartLoc,
                                  const_cast<CXXDestructorDecl*>(Dtor));
        if (DiagnoseUseOfDecl(Dtor, StartLoc))
          return ExprError();
      }

    CheckVirtualDtorCall(PointeeRD->getDestructor(), StartLoc,
                         /*IsDelete=*/true, /*CallCanBeVirtual=*/true,
                         /*WarnOnNonAbstractTypes=*/!ArrayForm,
                         SourceLocation());
  }

  if (!OperatorDelete) {
    bool IsComplete = isCompleteType(StartLoc, Pointee);
    bool CanProvideSize =
        IsComplete && (!ArrayForm || UsualArrayDeleteWantsSize ||
                       Pointee.isDestructedType());
    bool Overaligned = hasNewExtendedAlignment(*this, Pointee);

    // Look for a global declaration.
    OperatorDelete = FindUsualDeallocationFunction(StartLoc, CanProvideSize,
                                                   Overaligned, DeleteName);
  }

  MarkFunctionReferenced(StartLoc, OperatorDelete);

  // Check access and ambiguity of destructor if we're going to call it.
  // Note that this is required even for a virtual delete.
  bool IsVirtualDelete = false;
  if (PointeeRD) {
    if (CXXDestructorDecl *Dtor = LookupDestructor(PointeeRD)) {
      CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor,
                            PDiag(diag::err_access_dtor) << PointeeElem);
      IsVirtualDelete = Dtor->isVirtual();
    }
  }

  diagnoseUnavailableAlignedAllocation(*OperatorDelete, StartLoc, true,
                                       *this);

  // Convert the operand to the type of the first parameter of operator
  // delete. This is only necessary if we selected a destroying operator
  // delete that we are going to call (non-virtually); converting to void*
  // is trivial and left to AST consumers to handle.
  QualType ParamType = OperatorDelete->getParamDecl(0)->getType();
  if (!IsVirtualDelete && !ParamType->getPointeeType()->isVoidType()) {
    Qualifiers Qs = Pointee.getQualifiers();
    if (Qs.hasCVRQualifiers()) {
      // Qualifiers are irrelevant to this conversion; we're only looking
      // for access and ambiguity.
      Qs.removeCVRQualifiers();
      QualType Unqual = Context.getPointerType(
          Context.getQualifiedType(Pointee.getUnqualifiedType(), Qs));
      Ex = ImpCastExprToType(Ex.get(), Unqual, CK_NoOp);
    }
    Ex = PerformImplicitConversion(Ex.get(), ParamType, AA_Passing);
    if (Ex.isInvalid())
      return ExprError();
  }
}

CXXDeleteExpr *Result = new (Context) CXXDeleteExpr(
    Context.VoidTy, UseGlobal, ArrayForm, ArrayFormAsWritten,
    UsualArrayDeleteWantsSize, OperatorDelete, Ex.get(), StartLoc);
AnalyzeDeleteExprMismatch(Result);
return Result;
3343}

3345void Sema::CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
                              bool IsDelete, bool CallCanBeVirtual,
                              bool WarnOnNonAbstractTypes,
                              SourceLocation DtorLoc) {
if (!dtor || dtor->isVirtual() || !CallCanBeVirtual || isUnevaluatedContext())
  return;

// C++ [expr.delete]p3:
//   In the first alternative (delete object), if the static type of the
//   object to be deleted is different from its dynamic type, the static
//   type shall be a base class of the dynamic type of the object to be
//   deleted and the static type shall have a virtual destructor or the
//   behavior is undefined.
//
const CXXRecordDecl *PointeeRD = dtor->getParent();
// Note: a final class cannot be derived from, no issue there
if (!PointeeRD->isPolymorphic() || PointeeRD->hasAttr<FinalAttr>())
  return;

// If the superclass is in a system header, there's nothing that can be done.
// The `delete` (where we emit the warning) can be in a system header,
// what matters for this warning is where the deleted type is defined.
if (getSourceManager().isInSystemHeader(PointeeRD->getLocation()))
  return;

QualType ClassType = dtor->getThisType(Context)->getPointeeType();
if (PointeeRD->isAbstract()) {
  // If the class is abstract, we warn by default, because we're
  // sure the code has undefined behavior.
  Diag(Loc, diag::warn_delete_abstract_non_virtual_dtor) << (IsDelete ? 0 : 1)
                                                         << ClassType;
} else if (WarnOnNonAbstractTypes) {
  // Otherwise, if this is not an array delete, it's a bit suspect,
  // but not necessarily wrong.
  Diag(Loc, diag::warn_delete_non_virtual_dtor) << (IsDelete ? 0 : 1)
                                                << ClassType;
}
if (!IsDelete) {
  std::string TypeStr;
  ClassType.getAsStringInternal(TypeStr, getPrintingPolicy());
  Diag(DtorLoc, diag::note_delete_non_virtual)
      << FixItHint::CreateInsertion(DtorLoc, TypeStr + "::");
}
3388}

3390Sema::ConditionResult Sema::ActOnConditionVariable(Decl *ConditionVar,
                                                 SourceLocation StmtLoc,
                                                 ConditionKind CK) {
ExprResult E =
    CheckConditionVariable(cast<VarDecl>(ConditionVar), StmtLoc, CK);
if (E.isInvalid())
  return ConditionError();
return ConditionResult(*this, ConditionVar, MakeFullExpr(E.get(), StmtLoc),
                       CK == ConditionKind::ConstexprIf);
3399}

3401/// \brief Check the use of the given variable as a C++ condition in an if,
3402/// while, do-while, or switch statement.
3403ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar,
                                      SourceLocation StmtLoc,
                                      ConditionKind CK) {
if (ConditionVar->isInvalidDecl())
  return ExprError();

QualType T = ConditionVar->getType();

// C++ [stmt.select]p2:
//   The declarator shall not specify a function or an array.
if (T->isFunctionType())
  return ExprError(Diag(ConditionVar->getLocation(),
                        diag::err_invalid_use_of_function_type)
                     << ConditionVar->getSourceRange());
else if (T->isArrayType())
  return ExprError(Diag(ConditionVar->getLocation(),
                        diag::err_invalid_use_of_array_type)
                   << ConditionVar->getSourceRange());

ExprResult Condition = DeclRefExpr::Create(
    Context, NestedNameSpecifierLoc(), SourceLocation(), ConditionVar,
    /*enclosing*/ false, ConditionVar->getLocation(),
    ConditionVar->getType().getNonReferenceType(), VK_LValue);

MarkDeclRefReferenced(cast<DeclRefExpr>(Condition.get()));

switch (CK) {
case ConditionKind::Boolean:
  return CheckBooleanCondition(StmtLoc, Condition.get());

case ConditionKind::ConstexprIf:
  return CheckBooleanCondition(StmtLoc, Condition.get(), true);

case ConditionKind::Switch:
  return CheckSwitchCondition(StmtLoc, Condition.get());
}

llvm_unreachable("unexpected condition kind")::llvm::llvm_unreachable_internal("unexpected condition kind"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3440);
3441}

3443/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
3444ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr) {
// C++ 6.4p4:
// The value of a condition that is an initialized declaration in a statement
// other than a switch statement is the value of the declared variable
// implicitly converted to type bool. If that conversion is ill-formed, the
// program is ill-formed.
// The value of a condition that is an expression is the value of the
// expression, implicitly converted to bool.
//
// FIXME: Return this value to the caller so they don't need to recompute it.
llvm::APSInt Value(/*BitWidth*/1);
return (IsConstexpr && !CondExpr->isValueDependent())
           ? CheckConvertedConstantExpression(CondExpr, Context.BoolTy, Value,
                                              CCEK_ConstexprIf)
           : PerformContextuallyConvertToBool(CondExpr);
3459}

3461/// Helper function to determine whether this is the (deprecated) C++
3462/// conversion from a string literal to a pointer to non-const char or
3463/// non-const wchar_t (for narrow and wide string literals,
3464/// respectively).
3465bool
3466Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
// Look inside the implicit cast, if it exists.
if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
  From = Cast->getSubExpr();

// A string literal (2.13.4) that is not a wide string literal can
// be converted to an rvalue of type "pointer to char"; a wide
// string literal can be converted to an rvalue of type "pointer
// to wchar_t" (C++ 4.2p2).
if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens()))
  if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
    if (const BuiltinType *ToPointeeType
        = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
      // This conversion is considered only when there is an
      // explicit appropriate pointer target type (C++ 4.2p2).
      if (!ToPtrType->getPointeeType().hasQualifiers()) {
        switch (StrLit->getKind()) {
          case StringLiteral::UTF8:
          case StringLiteral::UTF16:
          case StringLiteral::UTF32:
            // We don't allow UTF literals to be implicitly converted
            break;
          case StringLiteral::Ascii:
            return (ToPointeeType->getKind() == BuiltinType::Char_U ||
                    ToPointeeType->getKind() == BuiltinType::Char_S);
          case StringLiteral::Wide:
            return Context.typesAreCompatible(Context.getWideCharType(),
                                              QualType(ToPointeeType, 0));
        }
      }
    }

return false;
3499}

3501static ExprResult BuildCXXCastArgument(Sema &S,
                                     SourceLocation CastLoc,
                                     QualType Ty,
                                     CastKind Kind,
                                     CXXMethodDecl *Method,
                                     DeclAccessPair FoundDecl,
                                     bool HadMultipleCandidates,
                                     Expr *From) {
switch (Kind) {
default: llvm_unreachable("Unhandled cast kind!")::llvm::llvm_unreachable_internal("Unhandled cast kind!", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3510);
case CK_ConstructorConversion: {
  CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
  SmallVector<Expr*, 8> ConstructorArgs;

  if (S.RequireNonAbstractType(CastLoc, Ty,
                               diag::err_allocation_of_abstract_type))
    return ExprError();

  if (S.CompleteConstructorCall(Constructor, From, CastLoc, ConstructorArgs))
    return ExprError();

  S.CheckConstructorAccess(CastLoc, Constructor, FoundDecl,
                           InitializedEntity::InitializeTemporary(Ty));
  if (S.DiagnoseUseOfDecl(Method, CastLoc))
    return ExprError();

  ExprResult Result = S.BuildCXXConstructExpr(
      CastLoc, Ty, FoundDecl, cast<CXXConstructorDecl>(Method),
      ConstructorArgs, HadMultipleCandidates,
      /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
      CXXConstructExpr::CK_Complete, SourceRange());
  if (Result.isInvalid())
    return ExprError();

  return S.MaybeBindToTemporary(Result.getAs<Expr>());
}

case CK_UserDefinedConversion: {
  assert(!From->getType()->isPointerType() && "Arg can't have pointer type!")(static_cast <bool> (!From->getType()->isPointerType
() && "Arg can't have pointer type!") ? void (0) : __assert_fail
 ("!From->getType()->isPointerType() && \"Arg can't have pointer type!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3539, __extension__ __PRETTY_FUNCTION__));

  S.CheckMemberOperatorAccess(CastLoc, From, /*arg*/ nullptr, FoundDecl);
  if (S.DiagnoseUseOfDecl(Method, CastLoc))
    return ExprError();

  // Create an implicit call expr that calls it.
  CXXConversionDecl *Conv = cast<CXXConversionDecl>(Method);
  ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Conv,
                                               HadMultipleCandidates);
  if (Result.isInvalid())
    return ExprError();
  // Record usage of conversion in an implicit cast.
  Result = ImplicitCastExpr::Create(S.Context, Result.get()->getType(),
                                    CK_UserDefinedConversion, Result.get(),
                                    nullptr, Result.get()->getValueKind());

  return S.MaybeBindToTemporary(Result.get());
}
}
3559}

3561/// PerformImplicitConversion - Perform an implicit conversion of the
3562/// expression From to the type ToType using the pre-computed implicit
3563/// conversion sequence ICS. Returns the converted
3564/// expression. Action is the kind of conversion we're performing,
3565/// used in the error message.
3566ExprResult
3567Sema::PerformImplicitConversion(Expr *From, QualType ToType,
                              const ImplicitConversionSequence &ICS,
                              AssignmentAction Action,
                              CheckedConversionKind CCK) {
switch (ICS.getKind()) {
case ImplicitConversionSequence::StandardConversion: {
  ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard,
                                             Action, CCK);
  if (Res.isInvalid())
    return ExprError();
  From = Res.get();
  break;
}

case ImplicitConversionSequence::UserDefinedConversion: {

    FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
    CastKind CastKind;
    QualType BeforeToType;
    assert(FD && "no conversion function for user-defined conversion seq")(static_cast <bool> (FD && "no conversion function for user-defined conversion seq"
) ? void (0) : __assert_fail ("FD && \"no conversion function for user-defined conversion seq\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3586, __extension__ __PRETTY_FUNCTION__));
    if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
      CastKind = CK_UserDefinedConversion;

      // If the user-defined conversion is specified by a conversion function,
      // the initial standard conversion sequence converts the source type to
      // the implicit object parameter of the conversion function.
      BeforeToType = Context.getTagDeclType(Conv->getParent());
    } else {
      const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD);
      CastKind = CK_ConstructorConversion;
      // Do no conversion if dealing with ... for the first conversion.
      if (!ICS.UserDefined.EllipsisConversion) {
        // If the user-defined conversion is specified by a constructor, the
        // initial standard conversion sequence converts the source type to
        // the type required by the argument of the constructor
        BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
      }
    }
    // Watch out for ellipsis conversion.
    if (!ICS.UserDefined.EllipsisConversion) {
      ExprResult Res =
        PerformImplicitConversion(From, BeforeToType,
                                  ICS.UserDefined.Before, AA_Converting,
                                  CCK);
      if (Res.isInvalid())
        return ExprError();
      From = Res.get();
    }

    ExprResult CastArg
      = BuildCXXCastArgument(*this,
                             From->getLocStart(),
                             ToType.getNonReferenceType(),
                             CastKind, cast<CXXMethodDecl>(FD),
                             ICS.UserDefined.FoundConversionFunction,
                             ICS.UserDefined.HadMultipleCandidates,
                             From);

    if (CastArg.isInvalid())
      return ExprError();

    From = CastArg.get();

    return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
                                     AA_Converting, CCK);
}

case ImplicitConversionSequence::AmbiguousConversion:
  ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(),
                        PDiag(diag::err_typecheck_ambiguous_condition)
                          << From->getSourceRange());
   return ExprError();

case ImplicitConversionSequence::EllipsisConversion:
  llvm_unreachable("Cannot perform an ellipsis conversion")::llvm::llvm_unreachable_internal("Cannot perform an ellipsis conversion"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3641);

case ImplicitConversionSequence::BadConversion:
  bool Diagnosed =
      DiagnoseAssignmentResult(Incompatible, From->getExprLoc(), ToType,
                               From->getType(), From, Action);
  assert(Diagnosed && "failed to diagnose bad conversion")(static_cast <bool> (Diagnosed && "failed to diagnose bad conversion"
) ? void (0) : __assert_fail ("Diagnosed && \"failed to diagnose bad conversion\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3647, __extension__ __PRETTY_FUNCTION__)); (void)Diagnosed;
  return ExprError();
}

// Everything went well.
return From;
3653}

3655/// PerformImplicitConversion - Perform an implicit conversion of the
3656/// expression From to the type ToType by following the standard
3657/// conversion sequence SCS. Returns the converted
3658/// expression. Flavor is the context in which we're performing this
3659/// conversion, for use in error messages.
3660ExprResult
3661Sema::PerformImplicitConversion(Expr *From, QualType ToType,
                              const StandardConversionSequence& SCS,
                              AssignmentAction Action,
                              CheckedConversionKind CCK) {
bool CStyle = (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast);

// Overall FIXME: we are recomputing too many types here and doing far too
// much extra work. What this means is that we need to keep track of more
// information that is computed when we try the implicit conversion initially,
// so that we don't need to recompute anything here.
QualType FromType = From->getType();

if (SCS.CopyConstructor) {
  // FIXME: When can ToType be a reference type?
  assert(!ToType->isReferenceType())(static_cast <bool> (!ToType->isReferenceType()) ? void
 (0) : __assert_fail ("!ToType->isReferenceType()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3675, __extension__ __PRETTY_FUNCTION__));
  if (SCS.Second == ICK_Derived_To_Base) {
    SmallVector<Expr*, 8> ConstructorArgs;
    if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
                                From, /*FIXME:ConstructLoc*/SourceLocation(),
                                ConstructorArgs))
      return ExprError();
    return BuildCXXConstructExpr(
        /*FIXME:ConstructLoc*/ SourceLocation(), ToType,
        SCS.FoundCopyConstructor, SCS.CopyConstructor,
        ConstructorArgs, /*HadMultipleCandidates*/ false,
        /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
        CXXConstructExpr::CK_Complete, SourceRange());
  }
  return BuildCXXConstructExpr(
      /*FIXME:ConstructLoc*/ SourceLocation(), ToType,
      SCS.FoundCopyConstructor, SCS.CopyConstructor,
      From, /*HadMultipleCandidates*/ false,
      /*ListInit*/ false, /*StdInitListInit*/ false, /*ZeroInit*/ false,
      CXXConstructExpr::CK_Complete, SourceRange());
}

// Resolve overloaded function references.
if (Context.hasSameType(FromType, Context.OverloadTy)) {
  DeclAccessPair Found;
  FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType,
                                                        true, Found);
  if (!Fn)
    return ExprError();

  if (DiagnoseUseOfDecl(Fn, From->getLocStart()))
    return ExprError();

  From = FixOverloadedFunctionReference(From, Found, Fn);
  FromType = From->getType();
}

// If we're converting to an atomic type, first convert to the corresponding
// non-atomic type.
QualType ToAtomicType;
if (const AtomicType *ToAtomic = ToType->getAs<AtomicType>()) {
  ToAtomicType = ToType;
  ToType = ToAtomic->getValueType();
}

QualType InitialFromType = FromType;
// Perform the first implicit conversion.
switch (SCS.First) {
case ICK_Identity:
  if (const AtomicType *FromAtomic = FromType->getAs<AtomicType>()) {
    FromType = FromAtomic->getValueType().getUnqualifiedType();
    From = ImplicitCastExpr::Create(Context, FromType, CK_AtomicToNonAtomic,
                                    From, /*BasePath=*/nullptr, VK_RValue);
  }
  break;

case ICK_Lvalue_To_Rvalue: {
  assert(From->getObjectKind() != OK_ObjCProperty)(static_cast <bool> (From->getObjectKind() != OK_ObjCProperty
) ? void (0) : __assert_fail ("From->getObjectKind() != OK_ObjCProperty"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3732, __extension__ __PRETTY_FUNCTION__));
  ExprResult FromRes = DefaultLvalueConversion(From);
  assert(!FromRes.isInvalid() && "Can't perform deduced conversion?!")(static_cast <bool> (!FromRes.isInvalid() && "Can't perform deduced conversion?!"
) ? void (0) : __assert_fail ("!FromRes.isInvalid() && \"Can't perform deduced conversion?!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3734, __extension__ __PRETTY_FUNCTION__));
  From = FromRes.get();
  FromType = From->getType();
  break;
}

case ICK_Array_To_Pointer:
  FromType = Context.getArrayDecayedType(FromType);
  From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Function_To_Pointer:
  FromType = Context.getPointerType(FromType);
  From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

default:
  llvm_unreachable("Improper first standard conversion")::llvm::llvm_unreachable_internal("Improper first standard conversion"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3753);
}

// Perform the second implicit conversion
switch (SCS.Second) {
case ICK_Identity:
  // C++ [except.spec]p5:
  //   [For] assignment to and initialization of pointers to functions,
  //   pointers to member functions, and references to functions: the
  //   target entity shall allow at least the exceptions allowed by the
  //   source value in the assignment or initialization.
  switch (Action) {
  case AA_Assigning:
  case AA_Initializing:
    // Note, function argument passing and returning are initialization.
  case AA_Passing:
  case AA_Returning:
  case AA_Sending:
  case AA_Passing_CFAudited:
    if (CheckExceptionSpecCompatibility(From, ToType))
      return ExprError();
    break;

  case AA_Casting:
  case AA_Converting:
    // Casts and implicit conversions are not initialization, so are not
    // checked for exception specification mismatches.
    break;
  }
  // Nothing else to do.
  break;

case ICK_Integral_Promotion:
case ICK_Integral_Conversion:
  if (ToType->isBooleanType()) {
    assert(FromType->castAs<EnumType>()->getDecl()->isFixed() &&(static_cast <bool> (FromType->castAs<EnumType>
()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion
 && "only enums with fixed underlying type can promote to bool"
) ? void (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3790, __extension__ __PRETTY_FUNCTION__))
           SCS.Second == ICK_Integral_Promotion &&(static_cast <bool> (FromType->castAs<EnumType>
()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion
 && "only enums with fixed underlying type can promote to bool"
) ? void (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3790, __extension__ __PRETTY_FUNCTION__))
           "only enums with fixed underlying type can promote to bool")(static_cast <bool> (FromType->castAs<EnumType>
()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion
 && "only enums with fixed underlying type can promote to bool"
) ? void (0) : __assert_fail ("FromType->castAs<EnumType>()->getDecl()->isFixed() && SCS.Second == ICK_Integral_Promotion && \"only enums with fixed underlying type can promote to bool\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3790, __extension__ __PRETTY_FUNCTION__));
    From = ImpCastExprToType(From, ToType, CK_IntegralToBoolean,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();
  } else {
    From = ImpCastExprToType(From, ToType, CK_IntegralCast,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();
  }
  break;

case ICK_Floating_Promotion:
case ICK_Floating_Conversion:
  From = ImpCastExprToType(From, ToType, CK_FloatingCast,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Complex_Promotion:
case ICK_Complex_Conversion: {
  QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType();
  QualType ToEl = ToType->getAs<ComplexType>()->getElementType();
  CastKind CK;
  if (FromEl->isRealFloatingType()) {
    if (ToEl->isRealFloatingType())
      CK = CK_FloatingComplexCast;
    else
      CK = CK_FloatingComplexToIntegralComplex;
  } else if (ToEl->isRealFloatingType()) {
    CK = CK_IntegralComplexToFloatingComplex;
  } else {
    CK = CK_IntegralComplexCast;
  }
  From = ImpCastExprToType(From, ToType, CK,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;
}

case ICK_Floating_Integral:
  if (ToType->isRealFloatingType())
    From = ImpCastExprToType(From, ToType, CK_IntegralToFloating,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();
  else
    From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Compatible_Conversion:
    From = ImpCastExprToType(From, ToType, CK_NoOp,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Writeback_Conversion:
case ICK_Pointer_Conversion: {
  if (SCS.IncompatibleObjC && Action != AA_Casting) {
    // Diagnose incompatible Objective-C conversions
    if (Action == AA_Initializing || Action == AA_Assigning)
      Diag(From->getLocStart(),
           diag::ext_typecheck_convert_incompatible_pointer)
        << ToType << From->getType() << Action
        << From->getSourceRange() << 0;
    else
      Diag(From->getLocStart(),
           diag::ext_typecheck_convert_incompatible_pointer)
        << From->getType() << ToType << Action
        << From->getSourceRange() << 0;

    if (From->getType()->isObjCObjectPointerType() &&
        ToType->isObjCObjectPointerType())
      EmitRelatedResultTypeNote(From);
  } else if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
             !CheckObjCARCUnavailableWeakConversion(ToType,
                                                    From->getType())) {
    if (Action == AA_Initializing)
      Diag(From->getLocStart(),
           diag::err_arc_weak_unavailable_assign);
    else
      Diag(From->getLocStart(),
           diag::err_arc_convesion_of_weak_unavailable)
        << (Action == AA_Casting) << From->getType() << ToType
        << From->getSourceRange();
  }

  CastKind Kind;
  CXXCastPath BasePath;
  if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle))
    return ExprError();

  // Make sure we extend blocks if necessary.
  // FIXME: doing this here is really ugly.
  if (Kind == CK_BlockPointerToObjCPointerCast) {
    ExprResult E = From;
    (void) PrepareCastToObjCObjectPointer(E);
    From = E.get();
  }
  if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
    CheckObjCConversion(SourceRange(), ToType, From, CCK);
  From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
           .get();
  break;
}

case ICK_Pointer_Member: {
  CastKind Kind;
  CXXCastPath BasePath;
  if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle))
    return ExprError();
  if (CheckExceptionSpecCompatibility(From, ToType))
    return ExprError();

  // We may not have been able to figure out what this member pointer resolved
  // to up until this exact point.  Attempt to lock-in it's inheritance model.
  if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
    (void)isCompleteType(From->getExprLoc(), From->getType());
    (void)isCompleteType(From->getExprLoc(), ToType);
  }

  From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath, CCK)
           .get();
  break;
}

case ICK_Boolean_Conversion:
  // Perform half-to-boolean conversion via float.
  if (From->getType()->isHalfType()) {
    From = ImpCastExprToType(From, Context.FloatTy, CK_FloatingCast).get();
    FromType = Context.FloatTy;
  }

  From = ImpCastExprToType(From, Context.BoolTy,
                           ScalarTypeToBooleanCastKind(FromType),
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Derived_To_Base: {
  CXXCastPath BasePath;
  if (CheckDerivedToBaseConversion(From->getType(),
                                   ToType.getNonReferenceType(),
                                   From->getLocStart(),
                                   From->getSourceRange(),
                                   &BasePath,
                                   CStyle))
    return ExprError();

  From = ImpCastExprToType(From, ToType.getNonReferenceType(),
                    CK_DerivedToBase, From->getValueKind(),
                    &BasePath, CCK).get();
  break;
}

case ICK_Vector_Conversion:
  From = ImpCastExprToType(From, ToType, CK_BitCast,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Vector_Splat: {
  // Vector splat from any arithmetic type to a vector.
  Expr *Elem = prepareVectorSplat(ToType, From).get();
  From = ImpCastExprToType(Elem, ToType, CK_VectorSplat, VK_RValue,
                           /*BasePath=*/nullptr, CCK).get();
  break;
}

case ICK_Complex_Real:
  // Case 1.  x -> _Complex y
  if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) {
    QualType ElType = ToComplex->getElementType();
    bool isFloatingComplex = ElType->isRealFloatingType();

    // x -> y
    if (Context.hasSameUnqualifiedType(ElType, From->getType())) {
      // do nothing
    } else if (From->getType()->isRealFloatingType()) {
      From = ImpCastExprToType(From, ElType,
              isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).get();
    } else {
      assert(From->getType()->isIntegerType())(static_cast <bool> (From->getType()->isIntegerType
()) ? void (0) : __assert_fail ("From->getType()->isIntegerType()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3963, __extension__ __PRETTY_FUNCTION__));
      From = ImpCastExprToType(From, ElType,
              isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).get();
    }
    // y -> _Complex y
    From = ImpCastExprToType(From, ToType,
                 isFloatingComplex ? CK_FloatingRealToComplex
                                   : CK_IntegralRealToComplex).get();

  // Case 2.  _Complex x -> y
  } else {
    const ComplexType *FromComplex = From->getType()->getAs<ComplexType>();
    assert(FromComplex)(static_cast <bool> (FromComplex) ? void (0) : __assert_fail
 ("FromComplex", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3975, __extension__ __PRETTY_FUNCTION__));

    QualType ElType = FromComplex->getElementType();
    bool isFloatingComplex = ElType->isRealFloatingType();

    // _Complex x -> x
    From = ImpCastExprToType(From, ElType,
                 isFloatingComplex ? CK_FloatingComplexToReal
                                   : CK_IntegralComplexToReal,
                             VK_RValue, /*BasePath=*/nullptr, CCK).get();

    // x -> y
    if (Context.hasSameUnqualifiedType(ElType, ToType)) {
      // do nothing
    } else if (ToType->isRealFloatingType()) {
      From = ImpCastExprToType(From, ToType,
                 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating,
                               VK_RValue, /*BasePath=*/nullptr, CCK).get();
    } else {
      assert(ToType->isIntegerType())(static_cast <bool> (ToType->isIntegerType()) ? void
 (0) : __assert_fail ("ToType->isIntegerType()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 3994, __extension__ __PRETTY_FUNCTION__));
      From = ImpCastExprToType(From, ToType,
                 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast,
                               VK_RValue, /*BasePath=*/nullptr, CCK).get();
    }
  }
  break;

case ICK_Block_Pointer_Conversion: {
  From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;
}

case ICK_TransparentUnionConversion: {
  ExprResult FromRes = From;
  Sema::AssignConvertType ConvTy =
    CheckTransparentUnionArgumentConstraints(ToType, FromRes);
  if (FromRes.isInvalid())
    return ExprError();
  From = FromRes.get();
  assert ((ConvTy == Sema::Compatible) &&(static_cast <bool> ((ConvTy == Sema::Compatible) &&
 "Improper transparent union conversion") ? void (0) : __assert_fail
 ("(ConvTy == Sema::Compatible) && \"Improper transparent union conversion\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4016, __extension__ __PRETTY_FUNCTION__))
          "Improper transparent union conversion")(static_cast <bool> ((ConvTy == Sema::Compatible) &&
 "Improper transparent union conversion") ? void (0) : __assert_fail
 ("(ConvTy == Sema::Compatible) && \"Improper transparent union conversion\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4016, __extension__ __PRETTY_FUNCTION__));
  (void)ConvTy;
  break;
}

case ICK_Zero_Event_Conversion:
  From = ImpCastExprToType(From, ToType,
                           CK_ZeroToOCLEvent,
                           From->getValueKind()).get();
  break;

case ICK_Zero_Queue_Conversion:
  From = ImpCastExprToType(From, ToType,
                           CK_ZeroToOCLQueue,
                           From->getValueKind()).get();
  break;

case ICK_Lvalue_To_Rvalue:
case ICK_Array_To_Pointer:
case ICK_Function_To_Pointer:
case ICK_Function_Conversion:
case ICK_Qualification:
case ICK_Num_Conversion_Kinds:
case ICK_C_Only_Conversion:
case ICK_Incompatible_Pointer_Conversion:
  llvm_unreachable("Improper second standard conversion")::llvm::llvm_unreachable_internal("Improper second standard conversion"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4041);
}

switch (SCS.Third) {
case ICK_Identity:
  // Nothing to do.
  break;

case ICK_Function_Conversion:
  // If both sides are functions (or pointers/references to them), there could
  // be incompatible exception declarations.
  if (CheckExceptionSpecCompatibility(From, ToType))
    return ExprError();

  From = ImpCastExprToType(From, ToType, CK_NoOp,
                           VK_RValue, /*BasePath=*/nullptr, CCK).get();
  break;

case ICK_Qualification: {
  // The qualification keeps the category of the inner expression, unless the
  // target type isn't a reference.
  ExprValueKind VK = ToType->isReferenceType() ?
                                From->getValueKind() : VK_RValue;
  From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context),
                           CK_NoOp, VK, /*BasePath=*/nullptr, CCK).get();

  if (SCS.DeprecatedStringLiteralToCharPtr &&
      !getLangOpts().WritableStrings) {
    Diag(From->getLocStart(), getLangOpts().CPlusPlus11
         ? diag::ext_deprecated_string_literal_conversion
         : diag::warn_deprecated_string_literal_conversion)
      << ToType.getNonReferenceType();
  }

  break;
}

default:
  llvm_unreachable("Improper third standard conversion")::llvm::llvm_unreachable_internal("Improper third standard conversion"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4079);
}

// If this conversion sequence involved a scalar -> atomic conversion, perform
// that conversion now.
if (!ToAtomicType.isNull()) {
  assert(Context.hasSameType((static_cast <bool> (Context.hasSameType( ToAtomicType->
castAs<AtomicType>()->getValueType(), From->getType
())) ? void (0) : __assert_fail ("Context.hasSameType( ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType())"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4086, __extension__ __PRETTY_FUNCTION__))
      ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType()))(static_cast <bool> (Context.hasSameType( ToAtomicType->
castAs<AtomicType>()->getValueType(), From->getType
())) ? void (0) : __assert_fail ("Context.hasSameType( ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType())"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4086, __extension__ __PRETTY_FUNCTION__));
  From = ImpCastExprToType(From, ToAtomicType, CK_NonAtomicToAtomic,
                           VK_RValue, nullptr, CCK).get();
}

// If this conversion sequence succeeded and involved implicitly converting a
// _Nullable type to a _Nonnull one, complain.
if (CCK == CCK_ImplicitConversion)
  diagnoseNullableToNonnullConversion(ToType, InitialFromType,
                                      From->getLocStart());

return From;
4098}

4100/// \brief Check the completeness of a type in a unary type trait.
4101///
4102/// If the particular type trait requires a complete type, tries to complete
4103/// it. If completing the type fails, a diagnostic is emitted and false
4104/// returned. If completing the type succeeds or no completion was required,
4105/// returns true.
4106static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S, TypeTrait UTT,
                                              SourceLocation Loc,
                                              QualType ArgTy) {
// C++0x [meta.unary.prop]p3:
//   For all of the class templates X declared in this Clause, instantiating
//   that template with a template argument that is a class template
//   specialization may result in the implicit instantiation of the template
//   argument if and only if the semantics of X require that the argument
//   must be a complete type.
// We apply this rule to all the type trait expressions used to implement
// these class templates. We also try to follow any GCC documented behavior
// in these expressions to ensure portability of standard libraries.
switch (UTT) {
default: llvm_unreachable("not a UTT")::llvm::llvm_unreachable_internal("not a UTT", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4119);
  // is_complete_type somewhat obviously cannot require a complete type.
case UTT_IsCompleteType:
  // Fall-through

  // These traits are modeled on the type predicates in C++0x
  // [meta.unary.cat] and [meta.unary.comp]. They are not specified as
  // requiring a complete type, as whether or not they return true cannot be
  // impacted by the completeness of the type.
case UTT_IsVoid:
case UTT_IsIntegral:
case UTT_IsFloatingPoint:
case UTT_IsArray:
case UTT_IsPointer:
case UTT_IsLvalueReference:
case UTT_IsRvalueReference:
case UTT_IsMemberFunctionPointer:
case UTT_IsMemberObjectPointer:
case UTT_IsEnum:
case UTT_IsUnion:
case UTT_IsClass:
case UTT_IsFunction:
case UTT_IsReference:
case UTT_IsArithmetic:
case UTT_IsFundamental:
case UTT_IsObject:
case UTT_IsScalar:
case UTT_IsCompound:
case UTT_IsMemberPointer:
  // Fall-through

  // These traits are modeled on type predicates in C++0x [meta.unary.prop]
  // which requires some of its traits to have the complete type. However,
  // the completeness of the type cannot impact these traits' semantics, and
  // so they don't require it. This matches the comments on these traits in
  // Table 49.
case UTT_IsConst:
case UTT_IsVolatile:
case UTT_IsSigned:
case UTT_IsUnsigned:

// This type trait always returns false, checking the type is moot.
case UTT_IsInterfaceClass:
  return true;

// C++14 [meta.unary.prop]:
//   If T is a non-union class type, T shall be a complete type.
case UTT_IsEmpty:
case UTT_IsPolymorphic:
case UTT_IsAbstract:
  if (const auto *RD = ArgTy->getAsCXXRecordDecl())
    if (!RD->isUnion())
      return !S.RequireCompleteType(
          Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
  return true;

// C++14 [meta.unary.prop]:
//   If T is a class type, T shall be a complete type.
case UTT_IsFinal:
case UTT_IsSealed:
  if (ArgTy->getAsCXXRecordDecl())
    return !S.RequireCompleteType(
        Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
  return true;

// C++1z [meta.unary.prop]:
//   remove_all_extents_t<T> shall be a complete type or cv void.
case UTT_IsAggregate:
case UTT_IsTrivial:
case UTT_IsTriviallyCopyable:
case UTT_IsStandardLayout:
case UTT_IsPOD:
case UTT_IsLiteral:
// Per the GCC type traits documentation, T shall be a complete type, cv void,
// or an array of unknown bound. But GCC actually imposes the same constraints
// as above.
case UTT_HasNothrowAssign:
case UTT_HasNothrowMoveAssign:
case UTT_HasNothrowConstructor:
case UTT_HasNothrowCopy:
case UTT_HasTrivialAssign:
case UTT_HasTrivialMoveAssign:
case UTT_HasTrivialDefaultConstructor:
case UTT_HasTrivialMoveConstructor:
case UTT_HasTrivialCopy:
case UTT_HasTrivialDestructor:
case UTT_HasVirtualDestructor:
  ArgTy = QualType(ArgTy->getBaseElementTypeUnsafe(), 0);
  LLVM_FALLTHROUGH[[clang::fallthrough]];

// C++1z [meta.unary.prop]:
//   T shall be a complete type, cv void, or an array of unknown bound.
case UTT_IsDestructible:
case UTT_IsNothrowDestructible:
case UTT_IsTriviallyDestructible:
case UTT_HasUniqueObjectRepresentations:
  if (ArgTy->isIncompleteArrayType() || ArgTy->isVoidType())
    return true;

  return !S.RequireCompleteType(
      Loc, ArgTy, diag::err_incomplete_type_used_in_type_trait_expr);
}
4221}

4223static bool HasNoThrowOperator(const RecordType *RT, OverloadedOperatorKind Op,
                             Sema &Self, SourceLocation KeyLoc, ASTContext &C,
                             bool (CXXRecordDecl::*HasTrivial)() const,
                             bool (CXXRecordDecl::*HasNonTrivial)() const,
                             bool (CXXMethodDecl::*IsDesiredOp)() const)
4228{
CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
if ((RD->*HasTrivial)() && !(RD->*HasNonTrivial)())
  return true;

DeclarationName Name = C.DeclarationNames.getCXXOperatorName(Op);
DeclarationNameInfo NameInfo(Name, KeyLoc);
LookupResult Res(Self, NameInfo, Sema::LookupOrdinaryName);
if (Self.LookupQualifiedName(Res, RD)) {
  bool FoundOperator = false;
  Res.suppressDiagnostics();
  for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end();
       Op != OpEnd; ++Op) {
    if (isa<FunctionTemplateDecl>(*Op))
      continue;

    CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op);
    if((Operator->*IsDesiredOp)()) {
      FoundOperator = true;
      const FunctionProtoType *CPT =
        Operator->getType()->getAs<FunctionProtoType>();
      CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
      if (!CPT || !CPT->isNothrow(C))
        return false;
    }
  }
  return FoundOperator;
}
return false;
4257}

4259static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
                                 SourceLocation KeyLoc, QualType T) {
assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")(static_cast <bool> (!T->isDependentType() &&
 "Cannot evaluate traits of dependent type") ? void (0) : __assert_fail
 ("!T->isDependentType() && \"Cannot evaluate traits of dependent type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4261, __extension__ __PRETTY_FUNCTION__));

ASTContext &C = Self.Context;
switch(UTT) {
default: llvm_unreachable("not a UTT")::llvm::llvm_unreachable_internal("not a UTT", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4265);
  // Type trait expressions corresponding to the primary type category
  // predicates in C++0x [meta.unary.cat].
case UTT_IsVoid:
  return T->isVoidType();
case UTT_IsIntegral:
  return T->isIntegralType(C);
case UTT_IsFloatingPoint:
  return T->isFloatingType();
case UTT_IsArray:
  return T->isArrayType();
case UTT_IsPointer:
  return T->isPointerType();
case UTT_IsLvalueReference:
  return T->isLValueReferenceType();
case UTT_IsRvalueReference:
  return T->isRValueReferenceType();
case UTT_IsMemberFunctionPointer:
  return T->isMemberFunctionPointerType();
case UTT_IsMemberObjectPointer:
  return T->isMemberDataPointerType();
case UTT_IsEnum:
  return T->isEnumeralType();
case UTT_IsUnion:
  return T->isUnionType();
case UTT_IsClass:
  return T->isClassType() || T->isStructureType() || T->isInterfaceType();
case UTT_IsFunction:
  return T->isFunctionType();

  // Type trait expressions which correspond to the convenient composition
  // predicates in C++0x [meta.unary.comp].
case UTT_IsReference:
  return T->isReferenceType();
case UTT_IsArithmetic:
  return T->isArithmeticType() && !T->isEnumeralType();
case UTT_IsFundamental:
  return T->isFundamentalType();
case UTT_IsObject:
  return T->isObjectType();
case UTT_IsScalar:
  // Note: semantic analysis depends on Objective-C lifetime types to be
  // considered scalar types. However, such types do not actually behave
  // like scalar types at run time (since they may require retain/release
  // operations), so we report them as non-scalar.
  if (T->isObjCLifetimeType()) {
    switch (T.getObjCLifetime()) {
    case Qualifiers::OCL_None:
    case Qualifiers::OCL_ExplicitNone:
      return true;

    case Qualifiers::OCL_Strong:
    case Qualifiers::OCL_Weak:
    case Qualifiers::OCL_Autoreleasing:
      return false;
    }
  }

  return T->isScalarType();
case UTT_IsCompound:
  return T->isCompoundType();
case UTT_IsMemberPointer:
  return T->isMemberPointerType();

  // Type trait expressions which correspond to the type property predicates
  // in C++0x [meta.unary.prop].
case UTT_IsConst:
  return T.isConstQualified();
case UTT_IsVolatile:
  return T.isVolatileQualified();
case UTT_IsTrivial:
  return T.isTrivialType(C);
case UTT_IsTriviallyCopyable:
  return T.isTriviallyCopyableType(C);
case UTT_IsStandardLayout:
  return T->isStandardLayoutType();
case UTT_IsPOD:
  return T.isPODType(C);
case UTT_IsLiteral:
  return T->isLiteralType(C);
case UTT_IsEmpty:
  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return !RD->isUnion() && RD->isEmpty();
  return false;
case UTT_IsPolymorphic:
  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return !RD->isUnion() && RD->isPolymorphic();
  return false;
case UTT_IsAbstract:
  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return !RD->isUnion() && RD->isAbstract();
  return false;
case UTT_IsAggregate:
  // Report vector extensions and complex types as aggregates because they
  // support aggregate initialization. GCC mirrors this behavior for vectors
  // but not _Complex.
  return T->isAggregateType() || T->isVectorType() || T->isExtVectorType() ||
         T->isAnyComplexType();
// __is_interface_class only returns true when CL is invoked in /CLR mode and
// even then only when it is used with the 'interface struct ...' syntax
// Clang doesn't support /CLR which makes this type trait moot.
case UTT_IsInterfaceClass:
  return false;
case UTT_IsFinal:
case UTT_IsSealed:
  if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return RD->hasAttr<FinalAttr>();
  return false;
case UTT_IsSigned:
  return T->isSignedIntegerType();
case UTT_IsUnsigned:
  return T->isUnsignedIntegerType();

  // Type trait expressions which query classes regarding their construction,
  // destruction, and copying. Rather than being based directly on the
  // related type predicates in the standard, they are specified by both
  // GCC[1] and the Embarcadero C++ compiler[2], and Clang implements those
  // specifications.
  //
  //   1: http://gcc.gnu/.org/onlinedocs/gcc/Type-Traits.html
  //   2: http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
  //
  // Note that these builtins do not behave as documented in g++: if a class
  // has both a trivial and a non-trivial special member of a particular kind,
  // they return false! For now, we emulate this behavior.
  // FIXME: This appears to be a g++ bug: more complex cases reveal that it
  // does not correctly compute triviality in the presence of multiple special
  // members of the same kind. Revisit this once the g++ bug is fixed.
case UTT_HasTrivialDefaultConstructor:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If __is_pod (type) is true then the trait is true, else if type is
  //   a cv class or union type (or array thereof) with a trivial default
  //   constructor ([class.ctor]) then the trait is true, else it is false.
  if (T.isPODType(C))
    return true;
  if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
    return RD->hasTrivialDefaultConstructor() &&
           !RD->hasNonTrivialDefaultConstructor();
  return false;
case UTT_HasTrivialMoveConstructor:
  //  This trait is implemented by MSVC 2012 and needed to parse the
  //  standard library headers. Specifically this is used as the logic
  //  behind std::is_trivially_move_constructible (20.9.4.3).
  if (T.isPODType(C))
    return true;
  if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
    return RD->hasTrivialMoveConstructor() && !RD->hasNonTrivialMoveConstructor();
  return false;
case UTT_HasTrivialCopy:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If __is_pod (type) is true or type is a reference type then
  //   the trait is true, else if type is a cv class or union type
  //   with a trivial copy constructor ([class.copy]) then the trait
  //   is true, else it is false.
  if (T.isPODType(C) || T->isReferenceType())
    return true;
  if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return RD->hasTrivialCopyConstructor() &&
           !RD->hasNonTrivialCopyConstructor();
  return false;
case UTT_HasTrivialMoveAssign:
  //  This trait is implemented by MSVC 2012 and needed to parse the
  //  standard library headers. Specifically it is used as the logic
  //  behind std::is_trivially_move_assignable (20.9.4.3)
  if (T.isPODType(C))
    return true;
  if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
    return RD->hasTrivialMoveAssignment() && !RD->hasNonTrivialMoveAssignment();
  return false;
case UTT_HasTrivialAssign:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If type is const qualified or is a reference type then the
  //   trait is false. Otherwise if __is_pod (type) is true then the
  //   trait is true, else if type is a cv class or union type with
  //   a trivial copy assignment ([class.copy]) then the trait is
  //   true, else it is false.
  // Note: the const and reference restrictions are interesting,
  // given that const and reference members don't prevent a class
  // from having a trivial copy assignment operator (but do cause
  // errors if the copy assignment operator is actually used, q.v.
  // [class.copy]p12).

  if (T.isConstQualified())
    return false;
  if (T.isPODType(C))
    return true;
  if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    return RD->hasTrivialCopyAssignment() &&
           !RD->hasNonTrivialCopyAssignment();
  return false;
case UTT_IsDestructible:
case UTT_IsTriviallyDestructible:
case UTT_IsNothrowDestructible:
  // C++14 [meta.unary.prop]:
  //   For reference types, is_destructible<T>::value is true.
  if (T->isReferenceType())
    return true;

  // Objective-C++ ARC: autorelease types don't require destruction.
  if (T->isObjCLifetimeType() &&
      T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
    return true;

  // C++14 [meta.unary.prop]:
  //   For incomplete types and function types, is_destructible<T>::value is
  //   false.
  if (T->isIncompleteType() || T->isFunctionType())
    return false;

  // A type that requires destruction (via a non-trivial destructor or ARC
  // lifetime semantics) is not trivially-destructible.
  if (UTT == UTT_IsTriviallyDestructible && T.isDestructedType())
    return false;

  // C++14 [meta.unary.prop]:
  //   For object types and given U equal to remove_all_extents_t<T>, if the
  //   expression std::declval<U&>().~U() is well-formed when treated as an
  //   unevaluated operand (Clause 5), then is_destructible<T>::value is true
  if (auto *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
    CXXDestructorDecl *Destructor = Self.LookupDestructor(RD);
    if (!Destructor)
      return false;
    //  C++14 [dcl.fct.def.delete]p2:
    //    A program that refers to a deleted function implicitly or
    //    explicitly, other than to declare it, is ill-formed.
    if (Destructor->isDeleted())
      return false;
    if (C.getLangOpts().AccessControl && Destructor->getAccess() != AS_public)
      return false;
    if (UTT == UTT_IsNothrowDestructible) {
      const FunctionProtoType *CPT =
          Destructor->getType()->getAs<FunctionProtoType>();
      CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
      if (!CPT || !CPT->isNothrow(C))
        return false;
    }
  }
  return true;

case UTT_HasTrivialDestructor:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
  //   If __is_pod (type) is true or type is a reference type
  //   then the trait is true, else if type is a cv class or union
  //   type (or array thereof) with a trivial destructor
  //   ([class.dtor]) then the trait is true, else it is
  //   false.
  if (T.isPODType(C) || T->isReferenceType())
    return true;

  // Objective-C++ ARC: autorelease types don't require destruction.
  if (T->isObjCLifetimeType() &&
      T.getObjCLifetime() == Qualifiers::OCL_Autoreleasing)
    return true;

  if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl())
    return RD->hasTrivialDestructor();
  return false;
// TODO: Propagate nothrowness for implicitly declared special members.
case UTT_HasNothrowAssign:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If type is const qualified or is a reference type then the
  //   trait is false. Otherwise if __has_trivial_assign (type)
  //   is true then the trait is true, else if type is a cv class
  //   or union type with copy assignment operators that are known
  //   not to throw an exception then the trait is true, else it is
  //   false.
  if (C.getBaseElementType(T).isConstQualified())
    return false;
  if (T->isReferenceType())
    return false;
  if (T.isPODType(C) || T->isObjCLifetimeType())
    return true;

  if (const RecordType *RT = T->getAs<RecordType>())
    return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
                              &CXXRecordDecl::hasTrivialCopyAssignment,
                              &CXXRecordDecl::hasNonTrivialCopyAssignment,
                              &CXXMethodDecl::isCopyAssignmentOperator);
  return false;
case UTT_HasNothrowMoveAssign:
  //  This trait is implemented by MSVC 2012 and needed to parse the
  //  standard library headers. Specifically this is used as the logic
  //  behind std::is_nothrow_move_assignable (20.9.4.3).
  if (T.isPODType(C))
    return true;

  if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>())
    return HasNoThrowOperator(RT, OO_Equal, Self, KeyLoc, C,
                              &CXXRecordDecl::hasTrivialMoveAssignment,
                              &CXXRecordDecl::hasNonTrivialMoveAssignment,
                              &CXXMethodDecl::isMoveAssignmentOperator);
  return false;
case UTT_HasNothrowCopy:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If __has_trivial_copy (type) is true then the trait is true, else
  //   if type is a cv class or union type with copy constructors that are
  //   known not to throw an exception then the trait is true, else it is
  //   false.
  if (T.isPODType(C) || T->isReferenceType() || T->isObjCLifetimeType())
    return true;
  if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) {
    if (RD->hasTrivialCopyConstructor() &&
        !RD->hasNonTrivialCopyConstructor())
      return true;

    bool FoundConstructor = false;
    unsigned FoundTQs;
    for (const auto *ND : Self.LookupConstructors(RD)) {
      // A template constructor is never a copy constructor.
      // FIXME: However, it may actually be selected at the actual overload
      // resolution point.
      if (isa<FunctionTemplateDecl>(ND->getUnderlyingDecl()))
        continue;
      // UsingDecl itself is not a constructor
      if (isa<UsingDecl>(ND))
        continue;
      auto *Constructor = cast<CXXConstructorDecl>(ND->getUnderlyingDecl());
      if (Constructor->isCopyConstructor(FoundTQs)) {
        FoundConstructor = true;
        const FunctionProtoType *CPT
            = Constructor->getType()->getAs<FunctionProtoType>();
        CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
        if (!CPT)
          return false;
        // TODO: check whether evaluating default arguments can throw.
        // For now, we'll be conservative and assume that they can throw.
        if (!CPT->isNothrow(C) || CPT->getNumParams() > 1)
          return false;
      }
    }

    return FoundConstructor;
  }
  return false;
case UTT_HasNothrowConstructor:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
  //   If __has_trivial_constructor (type) is true then the trait is
  //   true, else if type is a cv class or union type (or array
  //   thereof) with a default constructor that is known not to
  //   throw an exception then the trait is true, else it is false.
  if (T.isPODType(C) || T->isObjCLifetimeType())
    return true;
  if (CXXRecordDecl *RD = C.getBaseElementType(T)->getAsCXXRecordDecl()) {
    if (RD->hasTrivialDefaultConstructor() &&
        !RD->hasNonTrivialDefaultConstructor())
      return true;

    bool FoundConstructor = false;
    for (const auto *ND : Self.LookupConstructors(RD)) {
      // FIXME: In C++0x, a constructor template can be a default constructor.
      if (isa<FunctionTemplateDecl>(ND->getUnderlyingDecl()))
        continue;
      // UsingDecl itself is not a constructor
      if (isa<UsingDecl>(ND))
        continue;
      auto *Constructor = cast<CXXConstructorDecl>(ND->getUnderlyingDecl());
      if (Constructor->isDefaultConstructor()) {
        FoundConstructor = true;
        const FunctionProtoType *CPT
            = Constructor->getType()->getAs<FunctionProtoType>();
        CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
        if (!CPT)
          return false;
        // FIXME: check whether evaluating default arguments can throw.
        // For now, we'll be conservative and assume that they can throw.
        if (!CPT->isNothrow(C) || CPT->getNumParams() > 0)
          return false;
      }
    }
    return FoundConstructor;
  }
  return false;
case UTT_HasVirtualDestructor:
  // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html:
  //   If type is a class type with a virtual destructor ([class.dtor])
  //   then the trait is true, else it is false.
  if (CXXRecordDecl *RD = T->getAsCXXRecordDecl())
    if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD))
      return Destructor->isVirtual();
  return false;

  // These type trait expressions are modeled on the specifications for the
  // Embarcadero C++0x type trait functions:
  //   http://docwiki.embarcadero.com/RADStudio/XE/en/Type_Trait_Functions_(C%2B%2B0x)_Index
case UTT_IsCompleteType:
  // http://docwiki.embarcadero.com/RADStudio/XE/en/Is_complete_type_(typename_T_):
  //   Returns True if and only if T is a complete type at the point of the
  //   function call.
  return !T->isIncompleteType();
case UTT_HasUniqueObjectRepresentations:
  return C.hasUniqueObjectRepresentations(T);
}
4657}

4659static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
                                  QualType RhsT, SourceLocation KeyLoc);

4662static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
                            ArrayRef<TypeSourceInfo *> Args,
                            SourceLocation RParenLoc) {
if (Kind <= UTT_Last)
  return EvaluateUnaryTypeTrait(S, Kind, KWLoc, Args[0]->getType());

// Evaluate BTT_ReferenceBindsToTemporary alongside the IsConstructible
// traits to avoid duplication.
if (Kind <= BTT_Last && Kind != BTT_ReferenceBindsToTemporary)
  return EvaluateBinaryTypeTrait(S, Kind, Args[0]->getType(),
                                 Args[1]->getType(), RParenLoc);

switch (Kind) {
case clang::BTT_ReferenceBindsToTemporary:
case clang::TT_IsConstructible:
case clang::TT_IsNothrowConstructible:
case clang::TT_IsTriviallyConstructible: {
  // C++11 [meta.unary.prop]:
  //   is_trivially_constructible is defined as:
  //
  //     is_constructible<T, Args...>::value is true and the variable
  //     definition for is_constructible, as defined below, is known to call
  //     no operation that is not trivial.
  //
  //   The predicate condition for a template specialization
  //   is_constructible<T, Args...> shall be satisfied if and only if the
  //   following variable definition would be well-formed for some invented
  //   variable t:
  //
  //     T t(create<Args>()...);
  assert(!Args.empty())(static_cast <bool> (!Args.empty()) ? void (0) : __assert_fail
 ("!Args.empty()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4692, __extension__ __PRETTY_FUNCTION__));

  // Precondition: T and all types in the parameter pack Args shall be
  // complete types, (possibly cv-qualified) void, or arrays of
  // unknown bound.
  for (const auto *TSI : Args) {
    QualType ArgTy = TSI->getType();
    if (ArgTy->isVoidType() || ArgTy->isIncompleteArrayType())
      continue;

    if (S.RequireCompleteType(KWLoc, ArgTy,
        diag::err_incomplete_type_used_in_type_trait_expr))
      return false;
  }

  // Make sure the first argument is not incomplete nor a function type.
  QualType T = Args[0]->getType();
  if (T->isIncompleteType() || T->isFunctionType())
    return false;

  // Make sure the first argument is not an abstract type.
  CXXRecordDecl *RD = T->getAsCXXRecordDecl();
  if (RD && RD->isAbstract())
    return false;

  SmallVector<OpaqueValueExpr, 2> OpaqueArgExprs;
  SmallVector<Expr *, 2> ArgExprs;
  ArgExprs.reserve(Args.size() - 1);
  for (unsigned I = 1, N = Args.size(); I != N; ++I) {
    QualType ArgTy = Args[I]->getType();
    if (ArgTy->isObjectType() || ArgTy->isFunctionType())
      ArgTy = S.Context.getRValueReferenceType(ArgTy);
    OpaqueArgExprs.push_back(
        OpaqueValueExpr(Args[I]->getTypeLoc().getLocStart(),
                        ArgTy.getNonLValueExprType(S.Context),
                        Expr::getValueKindForType(ArgTy)));
  }
  for (Expr &E : OpaqueArgExprs)
    ArgExprs.push_back(&E);

  // Perform the initialization in an unevaluated context within a SFINAE
  // trap at translation unit scope.
  EnterExpressionEvaluationContext Unevaluated(
      S, Sema::ExpressionEvaluationContext::Unevaluated);
  Sema::SFINAETrap SFINAE(S, /*AccessCheckingSFINAE=*/true);
  Sema::ContextRAII TUContext(S, S.Context.getTranslationUnitDecl());
  InitializedEntity To(InitializedEntity::InitializeTemporary(Args[0]));
  InitializationKind InitKind(InitializationKind::CreateDirect(KWLoc, KWLoc,
                                                               RParenLoc));
  InitializationSequence Init(S, To, InitKind, ArgExprs);
  if (Init.Failed())
    return false;

  ExprResult Result = Init.Perform(S, To, InitKind, ArgExprs);
  if (Result.isInvalid() || SFINAE.hasErrorOccurred())
    return false;

  if (Kind == clang::TT_IsConstructible)
    return true;

  if (Kind == clang::BTT_ReferenceBindsToTemporary) {
    if (!T->isReferenceType())
      return false;

    return !Init.isDirectReferenceBinding();
  }

  if (Kind == clang::TT_IsNothrowConstructible)
    return S.canThrow(Result.get()) == CT_Cannot;

  if (Kind == clang::TT_IsTriviallyConstructible) {
    // Under Objective-C ARC and Weak, if the destination has non-trivial
    // Objective-C lifetime, this is a non-trivial construction.
    if (T.getNonReferenceType().hasNonTrivialObjCLifetime())
      return false;

    // The initialization succeeded; now make sure there are no non-trivial
    // calls.
    return !Result.get()->hasNonTrivialCall(S.Context);
  }

  llvm_unreachable("unhandled type trait")::llvm::llvm_unreachable_internal("unhandled type trait", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4773);
  return false;
}
  default: llvm_unreachable("not a TT")::llvm::llvm_unreachable_internal("not a TT", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4776);
}

return false;
4780}

4782ExprResult Sema::BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                              ArrayRef<TypeSourceInfo *> Args,
                              SourceLocation RParenLoc) {
QualType ResultType = Context.getLogicalOperationType();

if (Kind <= UTT_Last && !CheckUnaryTypeTraitTypeCompleteness(
                             *this, Kind, KWLoc, Args[0]->getType()))
  return ExprError();

bool Dependent = false;
for (unsigned I = 0, N = Args.size(); I != N; ++I) {
  if (Args[I]->getType()->isDependentType()) {
    Dependent = true;
    break;
  }
}

bool Result = false;
if (!Dependent)
  Result = evaluateTypeTrait(*this, Kind, KWLoc, Args, RParenLoc);

return TypeTraitExpr::Create(Context, ResultType, KWLoc, Kind, Args,
                             RParenLoc, Result);
4805}

4807ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                              ArrayRef<ParsedType> Args,
                              SourceLocation RParenLoc) {
SmallVector<TypeSourceInfo *, 4> ConvertedArgs;
ConvertedArgs.reserve(Args.size());

for (unsigned I = 0, N = Args.size(); I != N; ++I) {
  TypeSourceInfo *TInfo;
  QualType T = GetTypeFromParser(Args[I], &TInfo);
  if (!TInfo)
    TInfo = Context.getTrivialTypeSourceInfo(T, KWLoc);

  ConvertedArgs.push_back(TInfo);
}

return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
4823}

4825static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
                                  QualType RhsT, SourceLocation KeyLoc) {
assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&(static_cast <bool> (!LhsT->isDependentType() &&
 !RhsT->isDependentType() && "Cannot evaluate traits of dependent types"
) ? void (0) : __assert_fail ("!LhsT->isDependentType() && !RhsT->isDependentType() && \"Cannot evaluate traits of dependent types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4828, __extension__ __PRETTY_FUNCTION__))
       "Cannot evaluate traits of dependent types")(static_cast <bool> (!LhsT->isDependentType() &&
 !RhsT->isDependentType() && "Cannot evaluate traits of dependent types"
) ? void (0) : __assert_fail ("!LhsT->isDependentType() && !RhsT->isDependentType() && \"Cannot evaluate traits of dependent types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4828, __extension__ __PRETTY_FUNCTION__));

switch(BTT) {
case BTT_IsBaseOf: {
  // C++0x [meta.rel]p2
  // Base is a base class of Derived without regard to cv-qualifiers or
  // Base and Derived are not unions and name the same class type without
  // regard to cv-qualifiers.

  const RecordType *lhsRecord = LhsT->getAs<RecordType>();
  const RecordType *rhsRecord = RhsT->getAs<RecordType>();
  if (!rhsRecord || !lhsRecord) {
    const ObjCObjectType *LHSObjTy = LhsT->getAs<ObjCObjectType>();
    const ObjCObjectType *RHSObjTy = RhsT->getAs<ObjCObjectType>();
    if (!LHSObjTy || !RHSObjTy)
      return false;

    ObjCInterfaceDecl *BaseInterface = LHSObjTy->getInterface();
    ObjCInterfaceDecl *DerivedInterface = RHSObjTy->getInterface();
    if (!BaseInterface || !DerivedInterface)
      return false;

    if (Self.RequireCompleteType(
            KeyLoc, RhsT, diag::err_incomplete_type_used_in_type_trait_expr))
      return false;

    return BaseInterface->isSuperClassOf(DerivedInterface);
  }

  assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT)(static_cast <bool> (Self.Context.hasSameUnqualifiedType
(LhsT, RhsT) == (lhsRecord == rhsRecord)) ? void (0) : __assert_fail
 ("Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord == rhsRecord)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4858, __extension__ __PRETTY_FUNCTION__))
           == (lhsRecord == rhsRecord))(static_cast <bool> (Self.Context.hasSameUnqualifiedType
(LhsT, RhsT) == (lhsRecord == rhsRecord)) ? void (0) : __assert_fail
 ("Self.Context.hasSameUnqualifiedType(LhsT, RhsT) == (lhsRecord == rhsRecord)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 4858, __extension__ __PRETTY_FUNCTION__));

  if (lhsRecord == rhsRecord)
    return !lhsRecord->getDecl()->isUnion();

  // C++0x [meta.rel]p2:
  //   If Base and Derived are class types and are different types
  //   (ignoring possible cv-qualifiers) then Derived shall be a
  //   complete type.
  if (Self.RequireCompleteType(KeyLoc, RhsT,
                        diag::err_incomplete_type_used_in_type_trait_expr))
    return false;

  return cast<CXXRecordDecl>(rhsRecord->getDecl())
    ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl()));
}
case BTT_IsSame:
  return Self.Context.hasSameType(LhsT, RhsT);
case BTT_TypeCompatible: {
  // GCC ignores cv-qualifiers on arrays for this builtin.
  Qualifiers LhsQuals, RhsQuals;
  QualType Lhs = Self.getASTContext().getUnqualifiedArrayType(LhsT, LhsQuals);
  QualType Rhs = Self.getASTContext().getUnqualifiedArrayType(RhsT, RhsQuals);
  return Self.Context.typesAreCompatible(Lhs, Rhs);
}
case BTT_IsConvertible:
case BTT_IsConvertibleTo: {
  // C++0x [meta.rel]p4:
  //   Given the following function prototype:
  //
  //     template <class T>
  //       typename add_rvalue_reference<T>::type create();
  //
  //   the predicate condition for a template specialization
  //   is_convertible<From, To> shall be satisfied if and only if
  //   the return expression in the following code would be
  //   well-formed, including any implicit conversions to the return
  //   type of the function:
  //
  //     To test() {
  //       return create<From>();
  //     }
  //
  //   Access checking is performed as if in a context unrelated to To and
  //   From. Only the validity of the immediate context of the expression
  //   of the return-statement (including conversions to the return type)
  //   is considered.
  //
  // We model the initialization as a copy-initialization of a temporary
  // of the appropriate type, which for this expression is identical to the
  // return statement (since NRVO doesn't apply).

  // Functions aren't allowed to return function or array types.
  if (RhsT->isFunctionType() || RhsT->isArrayType())
    return false;

  // A return statement in a void function must have void type.
  if (RhsT->isVoidType())
    return LhsT->isVoidType();

  // A function definition requires a complete, non-abstract return type.
  if (!Self.isCompleteType(KeyLoc, RhsT) || Self.isAbstractType(KeyLoc, RhsT))
    return false;

  // Compute the result of add_rvalue_reference.
  if (LhsT->isObjectType() || LhsT->isFunctionType())
    LhsT = Self.Context.getRValueReferenceType(LhsT);

  // Build a fake source and destination for initialization.
  InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT));
  OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
                       Expr::getValueKindForType(LhsT));
  Expr *FromPtr = &From;
  InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc,
                                                         SourceLocation()));

  // Perform the initialization in an unevaluated context within a SFINAE
  // trap at translation unit scope.
  EnterExpressionEvaluationContext Unevaluated(
      Self, Sema::ExpressionEvaluationContext::Unevaluated);
  Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
  Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
  InitializationSequence Init(Self, To, Kind, FromPtr);
  if (Init.Failed())
    return false;

  ExprResult Result = Init.Perform(Self, To, Kind, FromPtr);
  return !Result.isInvalid() && !SFINAE.hasErrorOccurred();
}

case BTT_IsAssignable:
case BTT_IsNothrowAssignable:
case BTT_IsTriviallyAssignable: {
  // C++11 [meta.unary.prop]p3:
  //   is_trivially_assignable is defined as:
  //     is_assignable<T, U>::value is true and the assignment, as defined by
  //     is_assignable, is known to call no operation that is not trivial
  //
  //   is_assignable is defined as:
  //     The expression declval<T>() = declval<U>() is well-formed when
  //     treated as an unevaluated operand (Clause 5).
  //
  //   For both, T and U shall be complete types, (possibly cv-qualified)
  //   void, or arrays of unknown bound.
  if (!LhsT->isVoidType() && !LhsT->isIncompleteArrayType() &&
      Self.RequireCompleteType(KeyLoc, LhsT,
        diag::err_incomplete_type_used_in_type_trait_expr))
    return false;
  if (!RhsT->isVoidType() && !RhsT->isIncompleteArrayType() &&
      Self.RequireCompleteType(KeyLoc, RhsT,
        diag::err_incomplete_type_used_in_type_trait_expr))
    return false;

  // cv void is never assignable.
  if (LhsT->isVoidType() || RhsT->isVoidType())
    return false;

  // Build expressions that emulate the effect of declval<T>() and
  // declval<U>().
  if (LhsT->isObjectType() || LhsT->isFunctionType())
    LhsT = Self.Context.getRValueReferenceType(LhsT);
  if (RhsT->isObjectType() || RhsT->isFunctionType())
    RhsT = Self.Context.getRValueReferenceType(RhsT);
  OpaqueValueExpr Lhs(KeyLoc, LhsT.getNonLValueExprType(Self.Context),
                      Expr::getValueKindForType(LhsT));
  OpaqueValueExpr Rhs(KeyLoc, RhsT.getNonLValueExprType(Self.Context),
                      Expr::getValueKindForType(RhsT));

  // Attempt the assignment in an unevaluated context within a SFINAE
  // trap at translation unit scope.
  EnterExpressionEvaluationContext Unevaluated(
      Self, Sema::ExpressionEvaluationContext::Unevaluated);
  Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true);
  Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl());
  ExprResult Result = Self.BuildBinOp(/*S=*/nullptr, KeyLoc, BO_Assign, &Lhs,
                                      &Rhs);
  if (Result.isInvalid() || SFINAE.hasErrorOccurred())
    return false;

  if (BTT == BTT_IsAssignable)
    return true;

  if (BTT == BTT_IsNothrowAssignable)
    return Self.canThrow(Result.get()) == CT_Cannot;

  if (BTT == BTT_IsTriviallyAssignable) {
    // Under Objective-C ARC and Weak, if the destination has non-trivial
    // Objective-C lifetime, this is a non-trivial assignment.
    if (LhsT.getNonReferenceType().hasNonTrivialObjCLifetime())
      return false;

    return !Result.get()->hasNonTrivialCall(Self.Context);
  }

  llvm_unreachable("unhandled type trait")::llvm::llvm_unreachable_internal("unhandled type trait", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5012);
  return false;
}
  default: llvm_unreachable("not a BTT")::llvm::llvm_unreachable_internal("not a BTT", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5015);
}
llvm_unreachable("Unknown type trait or not implemented")::llvm::llvm_unreachable_internal("Unknown type trait or not implemented"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5017);
5018}

5020ExprResult Sema::ActOnArrayTypeTrait(ArrayTypeTrait ATT,
                                   SourceLocation KWLoc,
                                   ParsedType Ty,
                                   Expr* DimExpr,
                                   SourceLocation RParen) {
TypeSourceInfo *TSInfo;
QualType T = GetTypeFromParser(Ty, &TSInfo);
if (!TSInfo)
  TSInfo = Context.getTrivialTypeSourceInfo(T);

return BuildArrayTypeTrait(ATT, KWLoc, TSInfo, DimExpr, RParen);
5031}

5033static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
                                         QualType T, Expr *DimExpr,
                                         SourceLocation KeyLoc) {
assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")(static_cast <bool> (!T->isDependentType() &&
 "Cannot evaluate traits of dependent type") ? void (0) : __assert_fail
 ("!T->isDependentType() && \"Cannot evaluate traits of dependent type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5036, __extension__ __PRETTY_FUNCTION__));

switch(ATT) {
case ATT_ArrayRank:
  if (T->isArrayType()) {
    unsigned Dim = 0;
    while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
      ++Dim;
      T = AT->getElementType();
    }
    return Dim;
  }
  return 0;

case ATT_ArrayExtent: {
  llvm::APSInt Value;
  uint64_t Dim;
  if (Self.VerifyIntegerConstantExpression(DimExpr, &Value,
        diag::err_dimension_expr_not_constant_integer,
        false).isInvalid())
    return 0;
  if (Value.isSigned() && Value.isNegative()) {
    Self.Diag(KeyLoc, diag::err_dimension_expr_not_constant_integer)
      << DimExpr->getSourceRange();
    return 0;
  }
  Dim = Value.getLimitedValue();

  if (T->isArrayType()) {
    unsigned D = 0;
    bool Matched = false;
    while (const ArrayType *AT = Self.Context.getAsArrayType(T)) {
      if (Dim == D) {
        Matched = true;
        break;
      }
      ++D;
      T = AT->getElementType();
    }

    if (Matched && T->isArrayType()) {
      if (const ConstantArrayType *CAT = Self.Context.getAsConstantArrayType(T))
        return CAT->getSize().getLimitedValue();
    }
  }
  return 0;
}
}
llvm_unreachable("Unknown type trait or not implemented")::llvm::llvm_unreachable_internal("Unknown type trait or not implemented"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5084);
5085}

5087ExprResult Sema::BuildArrayTypeTrait(ArrayTypeTrait ATT,
                                   SourceLocation KWLoc,
                                   TypeSourceInfo *TSInfo,
                                   Expr* DimExpr,
                                   SourceLocation RParen) {
QualType T = TSInfo->getType();

// FIXME: This should likely be tracked as an APInt to remove any host
// assumptions about the width of size_t on the target.
uint64_t Value = 0;
if (!T->isDependentType())
  Value = EvaluateArrayTypeTrait(*this, ATT, T, DimExpr, KWLoc);

// While the specification for these traits from the Embarcadero C++
// compiler's documentation says the return type is 'unsigned int', Clang
// returns 'size_t'. On Windows, the primary platform for the Embarcadero
// compiler, there is no difference. On several other platforms this is an
// important distinction.
return new (Context) ArrayTypeTraitExpr(KWLoc, ATT, TSInfo, Value, DimExpr,
                                        RParen, Context.getSizeType());
5107}

5109ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
                                    SourceLocation KWLoc,
                                    Expr *Queried,
                                    SourceLocation RParen) {
// If error parsing the expression, ignore.
if (!Queried)
  return ExprError();

ExprResult Result = BuildExpressionTrait(ET, KWLoc, Queried, RParen);

return Result;
5120}

5122static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
switch (ET) {
case ET_IsLValueExpr: return E->isLValue();
case ET_IsRValueExpr: return E->isRValue();
}
llvm_unreachable("Expression trait not covered by switch")::llvm::llvm_unreachable_internal("Expression trait not covered by switch"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5127);
5128}

5130ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
                                    SourceLocation KWLoc,
                                    Expr *Queried,
                                    SourceLocation RParen) {
if (Queried->isTypeDependent()) {
  // Delay type-checking for type-dependent expressions.
} else if (Queried->getType()->isPlaceholderType()) {
  ExprResult PE = CheckPlaceholderExpr(Queried);
  if (PE.isInvalid()) return ExprError();
  return BuildExpressionTrait(ET, KWLoc, PE.get(), RParen);
}

bool Value = EvaluateExpressionTrait(ET, Queried);

return new (Context)
    ExpressionTraitExpr(KWLoc, ET, Queried, Value, RParen, Context.BoolTy);
5146}

5148QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
                                          ExprValueKind &VK,
                                          SourceLocation Loc,
                                          bool isIndirect) {
assert(!LHS.get()->getType()->isPlaceholderType() &&(static_cast <bool> (!LHS.get()->getType()->isPlaceholderType
() && !RHS.get()->getType()->isPlaceholderType(
) && "placeholders should have been weeded out by now"
) ? void (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5154, __extension__ __PRETTY_FUNCTION__))
       !RHS.get()->getType()->isPlaceholderType() &&(static_cast <bool> (!LHS.get()->getType()->isPlaceholderType
() && !RHS.get()->getType()->isPlaceholderType(
) && "placeholders should have been weeded out by now"
) ? void (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5154, __extension__ __PRETTY_FUNCTION__))
       "placeholders should have been weeded out by now")(static_cast <bool> (!LHS.get()->getType()->isPlaceholderType
() && !RHS.get()->getType()->isPlaceholderType(
) && "placeholders should have been weeded out by now"
) ? void (0) : __assert_fail ("!LHS.get()->getType()->isPlaceholderType() && !RHS.get()->getType()->isPlaceholderType() && \"placeholders should have been weeded out by now\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5154, __extension__ __PRETTY_FUNCTION__));

// The LHS undergoes lvalue conversions if this is ->*, and undergoes the
// temporary materialization conversion otherwise.
if (isIndirect)
  LHS = DefaultLvalueConversion(LHS.get());
else if (LHS.get()->isRValue())
  LHS = TemporaryMaterializationConversion(LHS.get());
if (LHS.isInvalid())
  return QualType();

// The RHS always undergoes lvalue conversions.
RHS = DefaultLvalueConversion(RHS.get());
if (RHS.isInvalid()) return QualType();

const char *OpSpelling = isIndirect ? "->*" : ".*";
// C++ 5.5p2
//   The binary operator .* [p3: ->*] binds its second operand, which shall
//   be of type "pointer to member of T" (where T is a completely-defined
//   class type) [...]
QualType RHSType = RHS.get()->getType();
const MemberPointerType *MemPtr = RHSType->getAs<MemberPointerType>();
if (!MemPtr) {
  Diag(Loc, diag::err_bad_memptr_rhs)
    << OpSpelling << RHSType << RHS.get()->getSourceRange();
  return QualType();
}

QualType Class(MemPtr->getClass(), 0);

// Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the
// member pointer points must be completely-defined. However, there is no
// reason for this semantic distinction, and the rule is not enforced by
// other compilers. Therefore, we do not check this property, as it is
// likely to be considered a defect.

// C++ 5.5p2
//   [...] to its first operand, which shall be of class T or of a class of
//   which T is an unambiguous and accessible base class. [p3: a pointer to
//   such a class]
QualType LHSType = LHS.get()->getType();
if (isIndirect) {
  if (const PointerType *Ptr = LHSType->getAs<PointerType>())
    LHSType = Ptr->getPointeeType();
  else {
    Diag(Loc, diag::err_bad_memptr_lhs)
      << OpSpelling << 1 << LHSType
      << FixItHint::CreateReplacement(SourceRange(Loc), ".*");
    return QualType();
  }
}

if (!Context.hasSameUnqualifiedType(Class, LHSType)) {
  // If we want to check the hierarchy, we need a complete type.
  if (RequireCompleteType(Loc, LHSType, diag::err_bad_memptr_lhs,
                          OpSpelling, (int)isIndirect)) {
    return QualType();
  }

  if (!IsDerivedFrom(Loc, LHSType, Class)) {
    Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
      << (int)isIndirect << LHS.get()->getType();
    return QualType();
  }

  CXXCastPath BasePath;
  if (CheckDerivedToBaseConversion(LHSType, Class, Loc,
                                   SourceRange(LHS.get()->getLocStart(),
                                               RHS.get()->getLocEnd()),
                                   &BasePath))
    return QualType();

  // Cast LHS to type of use.
  QualType UseType = Context.getQualifiedType(Class, LHSType.getQualifiers());
  if (isIndirect)
    UseType = Context.getPointerType(UseType);
  ExprValueKind VK = isIndirect ? VK_RValue : LHS.get()->getValueKind();
  LHS = ImpCastExprToType(LHS.get(), UseType, CK_DerivedToBase, VK,
                          &BasePath);
}

if (isa<CXXScalarValueInitExpr>(RHS.get()->IgnoreParens())) {
  // Diagnose use of pointer-to-member type which when used as
  // the functional cast in a pointer-to-member expression.
  Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
   return QualType();
}

// C++ 5.5p2
//   The result is an object or a function of the type specified by the
//   second operand.
// The cv qualifiers are the union of those in the pointer and the left side,
// in accordance with 5.5p5 and 5.2.5.
QualType Result = MemPtr->getPointeeType();
Result = Context.getCVRQualifiedType(Result, LHSType.getCVRQualifiers());

// C++0x [expr.mptr.oper]p6:
//   In a .* expression whose object expression is an rvalue, the program is
//   ill-formed if the second operand is a pointer to member function with
//   ref-qualifier &. In a ->* expression or in a .* expression whose object
//   expression is an lvalue, the program is ill-formed if the second operand
//   is a pointer to member function with ref-qualifier &&.
if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) {
  switch (Proto->getRefQualifier()) {
  case RQ_None:
    // Do nothing
    break;

  case RQ_LValue:
    if (!isIndirect && !LHS.get()->Classify(Context).isLValue()) {
      // C++2a allows functions with ref-qualifier & if they are also 'const'.
      if (Proto->isConst())
        Diag(Loc, getLangOpts().CPlusPlus2a
                      ? diag::warn_cxx17_compat_pointer_to_const_ref_member_on_rvalue
                      : diag::ext_pointer_to_const_ref_member_on_rvalue);
      else
        Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
            << RHSType << 1 << LHS.get()->getSourceRange();
    }
    break;

  case RQ_RValue:
    if (isIndirect || !LHS.get()->Classify(Context).isRValue())
      Diag(Loc, diag::err_pointer_to_member_oper_value_classify)
        << RHSType << 0 << LHS.get()->getSourceRange();
    break;
  }
}

// C++ [expr.mptr.oper]p6:
//   The result of a .* expression whose second operand is a pointer
//   to a data member is of the same value category as its
//   first operand. The result of a .* expression whose second
//   operand is a pointer to a member function is a prvalue. The
//   result of an ->* expression is an lvalue if its second operand
//   is a pointer to data member and a prvalue otherwise.
if (Result->isFunctionType()) {
  VK = VK_RValue;
  return Context.BoundMemberTy;
} else if (isIndirect) {
  VK = VK_LValue;
} else {
  VK = LHS.get()->getValueKind();
}

return Result;
5300}

5302/// \brief Try to convert a type to another according to C++11 5.16p3.
5303///
5304/// This is part of the parameter validation for the ? operator. If either
5305/// value operand is a class type, the two operands are attempted to be
5306/// converted to each other. This function does the conversion in one direction.
5307/// It returns true if the program is ill-formed and has already been diagnosed
5308/// as such.
5309static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
                              SourceLocation QuestionLoc,
                              bool &HaveConversion,
                              QualType &ToType) {
HaveConversion = false;
ToType = To->getType();

InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(),
                                                         SourceLocation());
// C++11 5.16p3
//   The process for determining whether an operand expression E1 of type T1
//   can be converted to match an operand expression E2 of type T2 is defined
//   as follows:
//   -- If E2 is an lvalue: E1 can be converted to match E2 if E1 can be
//      implicitly converted to type "lvalue reference to T2", subject to the
//      constraint that in the conversion the reference must bind directly to
//      an lvalue.
//   -- If E2 is an xvalue: E1 can be converted to match E2 if E1 can be
//      implicitly conveted to the type "rvalue reference to R2", subject to
//      the constraint that the reference must bind directly.
if (To->isLValue() || To->isXValue()) {
  QualType T = To->isLValue() ? Self.Context.getLValueReferenceType(ToType)
                              : Self.Context.getRValueReferenceType(ToType);

  InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);

  InitializationSequence InitSeq(Self, Entity, Kind, From);
  if (InitSeq.isDirectReferenceBinding()) {
    ToType = T;
    HaveConversion = true;
    return false;
  }

  if (InitSeq.isAmbiguous())
    return InitSeq.Diagnose(Self, Entity, Kind, From);
}

//   -- If E2 is an rvalue, or if the conversion above cannot be done:
//      -- if E1 and E2 have class type, and the underlying class types are
//         the same or one is a base class of the other:
QualType FTy = From->getType();
QualType TTy = To->getType();
const RecordType *FRec = FTy->getAs<RecordType>();
const RecordType *TRec = TTy->getAs<RecordType>();
bool FDerivedFromT = FRec && TRec && FRec != TRec &&
                     Self.IsDerivedFrom(QuestionLoc, FTy, TTy);
if (FRec && TRec && (FRec == TRec || FDerivedFromT ||
                     Self.IsDerivedFrom(QuestionLoc, TTy, FTy))) {
  //         E1 can be converted to match E2 if the class of T2 is the
  //         same type as, or a base class of, the class of T1, and
  //         [cv2 > cv1].
  if (FRec == TRec || FDerivedFromT) {
    if (TTy.isAtLeastAsQualifiedAs(FTy)) {
      InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
      InitializationSequence InitSeq(Self, Entity, Kind, From);
      if (InitSeq) {
        HaveConversion = true;
        return false;
      }

      if (InitSeq.isAmbiguous())
        return InitSeq.Diagnose(Self, Entity, Kind, From);
    }
  }

  return false;
}

//     -- Otherwise: E1 can be converted to match E2 if E1 can be
//        implicitly converted to the type that expression E2 would have
//        if E2 were converted to an rvalue (or the type it has, if E2 is
//        an rvalue).
//
// This actually refers very narrowly to the lvalue-to-rvalue conversion, not
// to the array-to-pointer or function-to-pointer conversions.
TTy = TTy.getNonLValueExprType(Self.Context);

InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy);
InitializationSequence InitSeq(Self, Entity, Kind, From);
HaveConversion = !InitSeq.Failed();
ToType = TTy;
if (InitSeq.isAmbiguous())
  return InitSeq.Diagnose(Self, Entity, Kind, From);

return false;
5394}

5396/// \brief Try to find a common type for two according to C++0x 5.16p5.
5397///
5398/// This is part of the parameter validation for the ? operator. If either
5399/// value operand is a class type, overload resolution is used to find a
5400/// conversion to a common type.
5401static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS,
                                  SourceLocation QuestionLoc) {
Expr *Args[2] = { LHS.get(), RHS.get() };
OverloadCandidateSet CandidateSet(QuestionLoc,
                                  OverloadCandidateSet::CSK_Operator);
Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args,
                                  CandidateSet);

OverloadCandidateSet::iterator Best;
switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) {
  case OR_Success: {
    // We found a match. Perform the conversions on the arguments and move on.
    ExprResult LHSRes = Self.PerformImplicitConversion(
        LHS.get(), Best->BuiltinParamTypes[0], Best->Conversions[0],
        Sema::AA_Converting);
    if (LHSRes.isInvalid())
      break;
    LHS = LHSRes;

    ExprResult RHSRes = Self.PerformImplicitConversion(
        RHS.get(), Best->BuiltinParamTypes[1], Best->Conversions[1],
        Sema::AA_Converting);
    if (RHSRes.isInvalid())
      break;
    RHS = RHSRes;
    if (Best->Function)
      Self.MarkFunctionReferenced(QuestionLoc, Best->Function);
    return false;
  }

  case OR_No_Viable_Function:

    // Emit a better diagnostic if one of the expressions is a null pointer
    // constant and the other is a pointer type. In this case, the user most
    // likely forgot to take the address of the other expression.
    if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
      return true;

    Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
      << LHS.get()->getType() << RHS.get()->getType()
      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    return true;

  case OR_Ambiguous:
    Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl)
      << LHS.get()->getType() << RHS.get()->getType()
      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    // FIXME: Print the possible common types by printing the return types of
    // the viable candidates.
    break;

  case OR_Deleted:
    llvm_unreachable("Conditional operator has only built-in overloads")::llvm::llvm_unreachable_internal("Conditional operator has only built-in overloads"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5453);
}
return true;
5456}

5458/// \brief Perform an "extended" implicit conversion as returned by
5459/// TryClassUnification.
5460static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(),
                                                         SourceLocation());
Expr *Arg = E.get();
InitializationSequence InitSeq(Self, Entity, Kind, Arg);
ExprResult Result = InitSeq.Perform(Self, Entity, Kind, Arg);
if (Result.isInvalid())
  return true;

E = Result;
return false;
5472}

5474/// \brief Check the operands of ?: under C++ semantics.
5475///
5476/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
5477/// extension. In this case, LHS == Cond. (But they're not aliases.)
5478QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
                                         ExprResult &RHS, ExprValueKind &VK,
                                         ExprObjectKind &OK,
                                         SourceLocation QuestionLoc) {
// FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
// interface pointers.

// C++11 [expr.cond]p1
//   The first expression is contextually converted to bool.
//
// FIXME; GCC's vector extension permits the use of a?b:c where the type of
//        a is that of a integer vector with the same number of elements and
//        size as the vectors of b and c. If one of either b or c is a scalar
//        it is implicitly converted to match the type of the vector.
//        Otherwise the expression is ill-formed. If both b and c are scalars,
//        then b and c are checked and converted to the type of a if possible.
//        Unlike the OpenCL ?: operator, the expression is evaluated as
//        (a[0] != 0 ? b[0] : c[0], .. , a[n] != 0 ? b[n] : c[n]).
if (!Cond.get()->isTypeDependent()) {
  ExprResult CondRes = CheckCXXBooleanCondition(Cond.get());
  if (CondRes.isInvalid())
    return QualType();
  Cond = CondRes;
}

// Assume r-value.
VK = VK_RValue;
OK = OK_Ordinary;

// Either of the arguments dependent?
if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent())
  return Context.DependentTy;

// C++11 [expr.cond]p2
//   If either the second or the third operand has type (cv) void, ...
QualType LTy = LHS.get()->getType();
QualType RTy = RHS.get()->getType();
bool LVoid = LTy->isVoidType();
bool RVoid = RTy->isVoidType();
if (LVoid || RVoid) {
  //   ... one of the following shall hold:
  //   -- The second or the third operand (but not both) is a (possibly
  //      parenthesized) throw-expression; the result is of the type
  //      and value category of the other.
  bool LThrow = isa<CXXThrowExpr>(LHS.get()->IgnoreParenImpCasts());
  bool RThrow = isa<CXXThrowExpr>(RHS.get()->IgnoreParenImpCasts());
  if (LThrow != RThrow) {
    Expr *NonThrow = LThrow ? RHS.get() : LHS.get();
    VK = NonThrow->getValueKind();
    // DR (no number yet): the result is a bit-field if the
    // non-throw-expression operand is a bit-field.
    OK = NonThrow->getObjectKind();
    return NonThrow->getType();
  }

  //   -- Both the second and third operands have type void; the result is of
  //      type void and is a prvalue.
  if (LVoid && RVoid)
    return Context.VoidTy;

  // Neither holds, error.
  Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
    << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
  return QualType();
}

// Neither is void.

// C++11 [expr.cond]p3
//   Otherwise, if the second and third operand have different types, and
//   either has (cv) class type [...] an attempt is made to convert each of
//   those operands to the type of the other.
if (!Context.hasSameType(LTy, RTy) &&
    (LTy->isRecordType() || RTy->isRecordType())) {
  // These return true if a single direction is already ambiguous.
  QualType L2RType, R2LType;
  bool HaveL2R, HaveR2L;
  if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType))
    return QualType();
  if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType))
    return QualType();

  //   If both can be converted, [...] the program is ill-formed.
  if (HaveL2R && HaveR2L) {
    Diag(QuestionLoc, diag::err_conditional_ambiguous)
      << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    return QualType();
  }

  //   If exactly one conversion is possible, that conversion is applied to
  //   the chosen operand and the converted operands are used in place of the
  //   original operands for the remainder of this section.
  if (HaveL2R) {
    if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid())
      return QualType();
    LTy = LHS.get()->getType();
  } else if (HaveR2L) {
    if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid())
      return QualType();
    RTy = RHS.get()->getType();
  }
}

// C++11 [expr.cond]p3
//   if both are glvalues of the same value category and the same type except
//   for cv-qualification, an attempt is made to convert each of those
//   operands to the type of the other.
// FIXME:
//   Resolving a defect in P0012R1: we extend this to cover all cases where
//   one of the operands is reference-compatible with the other, in order
//   to support conditionals between functions differing in noexcept.
ExprValueKind LVK = LHS.get()->getValueKind();
ExprValueKind RVK = RHS.get()->getValueKind();
if (!Context.hasSameType(LTy, RTy) &&
    LVK == RVK && LVK != VK_RValue) {
  // DerivedToBase was already handled by the class-specific case above.
  // FIXME: Should we allow ObjC conversions here?
  bool DerivedToBase, ObjCConversion, ObjCLifetimeConversion;
  if (CompareReferenceRelationship(
          QuestionLoc, LTy, RTy, DerivedToBase,
          ObjCConversion, ObjCLifetimeConversion) == Ref_Compatible &&
      !DerivedToBase && !ObjCConversion && !ObjCLifetimeConversion &&
      // [...] subject to the constraint that the reference must bind
      // directly [...]
      !RHS.get()->refersToBitField() &&
      !RHS.get()->refersToVectorElement()) {
    RHS = ImpCastExprToType(RHS.get(), LTy, CK_NoOp, RVK);
    RTy = RHS.get()->getType();
  } else if (CompareReferenceRelationship(
                 QuestionLoc, RTy, LTy, DerivedToBase,
                 ObjCConversion, ObjCLifetimeConversion) == Ref_Compatible &&
             !DerivedToBase && !ObjCConversion && !ObjCLifetimeConversion &&
             !LHS.get()->refersToBitField() &&
             !LHS.get()->refersToVectorElement()) {
    LHS = ImpCastExprToType(LHS.get(), RTy, CK_NoOp, LVK);
    LTy = LHS.get()->getType();
  }
}

// C++11 [expr.cond]p4
//   If the second and third operands are glvalues of the same value
//   category and have the same type, the result is of that type and
//   value category and it is a bit-field if the second or the third
//   operand is a bit-field, or if both are bit-fields.
// We only extend this to bitfields, not to the crazy other kinds of
// l-values.
bool Same = Context.hasSameType(LTy, RTy);
if (Same && LVK == RVK && LVK != VK_RValue &&
    LHS.get()->isOrdinaryOrBitFieldObject() &&
    RHS.get()->isOrdinaryOrBitFieldObject()) {
  VK = LHS.get()->getValueKind();
  if (LHS.get()->getObjectKind() == OK_BitField ||
      RHS.get()->getObjectKind() == OK_BitField)
    OK = OK_BitField;

  // If we have function pointer types, unify them anyway to unify their
  // exception specifications, if any.
  if (LTy->isFunctionPointerType() || LTy->isMemberFunctionPointerType()) {
    Qualifiers Qs = LTy.getQualifiers();
    LTy = FindCompositePointerType(QuestionLoc, LHS, RHS,
                                   /*ConvertArgs*/false);
    LTy = Context.getQualifiedType(LTy, Qs);

    assert(!LTy.isNull() && "failed to find composite pointer type for "(static_cast <bool> (!LTy.isNull() && "failed to find composite pointer type for "
 "canonically equivalent function ptr types") ? void (0) : __assert_fail
 ("!LTy.isNull() && \"failed to find composite pointer type for \" \"canonically equivalent function ptr types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5643, __extension__ __PRETTY_FUNCTION__))
                            "canonically equivalent function ptr types")(static_cast <bool> (!LTy.isNull() && "failed to find composite pointer type for "
 "canonically equivalent function ptr types") ? void (0) : __assert_fail
 ("!LTy.isNull() && \"failed to find composite pointer type for \" \"canonically equivalent function ptr types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5643, __extension__ __PRETTY_FUNCTION__));
    assert(Context.hasSameType(LTy, RTy) && "bad composite pointer type")(static_cast <bool> (Context.hasSameType(LTy, RTy) &&
 "bad composite pointer type") ? void (0) : __assert_fail ("Context.hasSameType(LTy, RTy) && \"bad composite pointer type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5644, __extension__ __PRETTY_FUNCTION__));
  }

  return LTy;
}

// C++11 [expr.cond]p5
//   Otherwise, the result is a prvalue. If the second and third operands
//   do not have the same type, and either has (cv) class type, ...
if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
  //   ... overload resolution is used to determine the conversions (if any)
  //   to be applied to the operands. If the overload resolution fails, the
  //   program is ill-formed.
  if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
    return QualType();
}

// C++11 [expr.cond]p6
//   Lvalue-to-rvalue, array-to-pointer, and function-to-pointer standard
//   conversions are performed on the second and third operands.
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();
LTy = LHS.get()->getType();
RTy = RHS.get()->getType();

//   After those conversions, one of the following shall hold:
//   -- The second and third operands have the same type; the result
//      is of that type. If the operands have class type, the result
//      is a prvalue temporary of the result type, which is
//      copy-initialized from either the second operand or the third
//      operand depending on the value of the first operand.
if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) {
  if (LTy->isRecordType()) {
    // The operands have class type. Make a temporary copy.
    InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy);

    ExprResult LHSCopy = PerformCopyInitialization(Entity,
                                                   SourceLocation(),
                                                   LHS);
    if (LHSCopy.isInvalid())
      return QualType();

    ExprResult RHSCopy = PerformCopyInitialization(Entity,
                                                   SourceLocation(),
                                                   RHS);
    if (RHSCopy.isInvalid())
      return QualType();

    LHS = LHSCopy;
    RHS = RHSCopy;
  }

  // If we have function pointer types, unify them anyway to unify their
  // exception specifications, if any.
  if (LTy->isFunctionPointerType() || LTy->isMemberFunctionPointerType()) {
    LTy = FindCompositePointerType(QuestionLoc, LHS, RHS);
    assert(!LTy.isNull() && "failed to find composite pointer type for "(static_cast <bool> (!LTy.isNull() && "failed to find composite pointer type for "
 "canonically equivalent function ptr types") ? void (0) : __assert_fail
 ("!LTy.isNull() && \"failed to find composite pointer type for \" \"canonically equivalent function ptr types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5703, __extension__ __PRETTY_FUNCTION__))
                            "canonically equivalent function ptr types")(static_cast <bool> (!LTy.isNull() && "failed to find composite pointer type for "
 "canonically equivalent function ptr types") ? void (0) : __assert_fail
 ("!LTy.isNull() && \"failed to find composite pointer type for \" \"canonically equivalent function ptr types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5703, __extension__ __PRETTY_FUNCTION__));
  }

  return LTy;
}

// Extension: conditional operator involving vector types.
if (LTy->isVectorType() || RTy->isVectorType())
  return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false,
                             /*AllowBothBool*/true,
                             /*AllowBoolConversions*/false);

//   -- The second and third operands have arithmetic or enumeration type;
//      the usual arithmetic conversions are performed to bring them to a
//      common type, and the result is of that type.
if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
  QualType ResTy = UsualArithmeticConversions(LHS, RHS);
  if (LHS.isInvalid() || RHS.isInvalid())
    return QualType();
  if (ResTy.isNull()) {
    Diag(QuestionLoc,
         diag::err_typecheck_cond_incompatible_operands) << LTy << RTy
      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    return QualType();
  }

  LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
  RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));

  return ResTy;
}

//   -- The second and third operands have pointer type, or one has pointer
//      type and the other is a null pointer constant, or both are null
//      pointer constants, at least one of which is non-integral; pointer
//      conversions and qualification conversions are performed to bring them
//      to their composite pointer type. The result is of the composite
//      pointer type.
//   -- The second and third operands have pointer to member type, or one has
//      pointer to member type and the other is a null pointer constant;
//      pointer to member conversions and qualification conversions are
//      performed to bring them to a common type, whose cv-qualification
//      shall match the cv-qualification of either the second or the third
//      operand. The result is of the common type.
QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS);
if (!Composite.isNull())
  return Composite;

// Similarly, attempt to find composite type of two objective-c pointers.
Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc);
if (!Composite.isNull())
  return Composite;

// Check if we are using a null with a non-pointer type.
if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
  return QualType();

Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
  << LHS.get()->getType() << RHS.get()->getType()
  << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
5764}

5766static FunctionProtoType::ExceptionSpecInfo
5767mergeExceptionSpecs(Sema &S, FunctionProtoType::ExceptionSpecInfo ESI1,
                  FunctionProtoType::ExceptionSpecInfo ESI2,
                  SmallVectorImpl<QualType> &ExceptionTypeStorage) {
ExceptionSpecificationType EST1 = ESI1.Type;
ExceptionSpecificationType EST2 = ESI2.Type;

// If either of them can throw anything, that is the result.
if (EST1 == EST_None) return ESI1;
if (EST2 == EST_None) return ESI2;
if (EST1 == EST_MSAny) return ESI1;
if (EST2 == EST_MSAny) return ESI2;

// If either of them is non-throwing, the result is the other.
if (EST1 == EST_DynamicNone) return ESI2;
if (EST2 == EST_DynamicNone) return ESI1;
if (EST1 == EST_BasicNoexcept) return ESI2;
if (EST2 == EST_BasicNoexcept) return ESI1;

// If either of them is a non-value-dependent computed noexcept, that
// determines the result.
if (EST2 == EST_ComputedNoexcept && ESI2.NoexceptExpr &&
    !ESI2.NoexceptExpr->isValueDependent())
  return !ESI2.NoexceptExpr->EvaluateKnownConstInt(S.Context) ? ESI2 : ESI1;
if (EST1 == EST_ComputedNoexcept && ESI1.NoexceptExpr &&
    !ESI1.NoexceptExpr->isValueDependent())
  return !ESI1.NoexceptExpr->EvaluateKnownConstInt(S.Context) ? ESI1 : ESI2;
// If we're left with value-dependent computed noexcept expressions, we're
// stuck. Before C++17, we can just drop the exception specification entirely,
// since it's not actually part of the canonical type. And this should never
// happen in C++17, because it would mean we were computing the composite
// pointer type of dependent types, which should never happen.
if (EST1 == EST_ComputedNoexcept || EST2 == EST_ComputedNoexcept) {
  assert(!S.getLangOpts().CPlusPlus17 &&(static_cast <bool> (!S.getLangOpts().CPlusPlus17 &&
 "computing composite pointer type of dependent types") ? void
 (0) : __assert_fail ("!S.getLangOpts().CPlusPlus17 && \"computing composite pointer type of dependent types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5800, __extension__ __PRETTY_FUNCTION__))
         "computing composite pointer type of dependent types")(static_cast <bool> (!S.getLangOpts().CPlusPlus17 &&
 "computing composite pointer type of dependent types") ? void
 (0) : __assert_fail ("!S.getLangOpts().CPlusPlus17 && \"computing composite pointer type of dependent types\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5800, __extension__ __PRETTY_FUNCTION__));
  return FunctionProtoType::ExceptionSpecInfo();
}

// Switch over the possibilities so that people adding new values know to
// update this function.
switch (EST1) {
case EST_None:
case EST_DynamicNone:
case EST_MSAny:
case EST_BasicNoexcept:
case EST_ComputedNoexcept:
  llvm_unreachable("handled above")::llvm::llvm_unreachable_internal("handled above", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5812);

case EST_Dynamic: {
  // This is the fun case: both exception specifications are dynamic. Form
  // the union of the two lists.
  assert(EST2 == EST_Dynamic && "other cases should already be handled")(static_cast <bool> (EST2 == EST_Dynamic && "other cases should already be handled"
) ? void (0) : __assert_fail ("EST2 == EST_Dynamic && \"other cases should already be handled\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5817, __extension__ __PRETTY_FUNCTION__));
  llvm::SmallPtrSet<QualType, 8> Found;
  for (auto &Exceptions : {ESI1.Exceptions, ESI2.Exceptions})
    for (QualType E : Exceptions)
      if (Found.insert(S.Context.getCanonicalType(E)).second)
        ExceptionTypeStorage.push_back(E);

  FunctionProtoType::ExceptionSpecInfo Result(EST_Dynamic);
  Result.Exceptions = ExceptionTypeStorage;
  return Result;
}

case EST_Unevaluated:
case EST_Uninstantiated:
case EST_Unparsed:
  llvm_unreachable("shouldn't see unresolved exception specifications here")::llvm::llvm_unreachable_internal("shouldn't see unresolved exception specifications here"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5832);
}

llvm_unreachable("invalid ExceptionSpecificationType")::llvm::llvm_unreachable_internal("invalid ExceptionSpecificationType"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5835);
5836}

5838/// \brief Find a merged pointer type and convert the two expressions to it.
5839///
5840/// This finds the composite pointer type (or member pointer type) for @p E1
5841/// and @p E2 according to C++1z 5p14. It converts both expressions to this
5842/// type and returns it.
5843/// It does not emit diagnostics.
5844///
5845/// \param Loc The location of the operator requiring these two expressions to
5846/// be converted to the composite pointer type.
5847///
5848/// \param ConvertArgs If \c false, do not convert E1 and E2 to the target type.
5849QualType Sema::FindCompositePointerType(SourceLocation Loc,
                                      Expr *&E1, Expr *&E2,
                                      bool ConvertArgs) {
assert(getLangOpts().CPlusPlus && "This function assumes C++")(static_cast <bool> (getLangOpts().CPlusPlus &&
 "This function assumes C++") ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"This function assumes C++\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5852, __extension__ __PRETTY_FUNCTION__));

// C++1z [expr]p14:
//   The composite pointer type of two operands p1 and p2 having types T1
//   and T2
QualType T1 = E1->getType(), T2 = E2->getType();

//   where at least one is a pointer or pointer to member type or
//   std::nullptr_t is:
bool T1IsPointerLike = T1->isAnyPointerType() || T1->isMemberPointerType() ||
                       T1->isNullPtrType();
bool T2IsPointerLike = T2->isAnyPointerType() || T2->isMemberPointerType() ||
                       T2->isNullPtrType();
if (!T1IsPointerLike && !T2IsPointerLike)
  return QualType();

//   - if both p1 and p2 are null pointer constants, std::nullptr_t;
// This can't actually happen, following the standard, but we also use this
// to implement the end of [expr.conv], which hits this case.
//
//   - if either p1 or p2 is a null pointer constant, T2 or T1, respectively;
if (T1IsPointerLike &&
    E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
  if (ConvertArgs)
    E2 = ImpCastExprToType(E2, T1, T1->isMemberPointerType()
                                       ? CK_NullToMemberPointer
                                       : CK_NullToPointer).get();
  return T1;
}
if (T2IsPointerLike &&
    E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
  if (ConvertArgs)
    E1 = ImpCastExprToType(E1, T2, T2->isMemberPointerType()
                                       ? CK_NullToMemberPointer
                                       : CK_NullToPointer).get();
  return T2;
}

// Now both have to be pointers or member pointers.
if (!T1IsPointerLike || !T2IsPointerLike)
  return QualType();
assert(!T1->isNullPtrType() && !T2->isNullPtrType() &&(static_cast <bool> (!T1->isNullPtrType() &&
 !T2->isNullPtrType() && "nullptr_t should be a null pointer constant"
) ? void (0) : __assert_fail ("!T1->isNullPtrType() && !T2->isNullPtrType() && \"nullptr_t should be a null pointer constant\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5894, __extension__ __PRETTY_FUNCTION__))
       "nullptr_t should be a null pointer constant")(static_cast <bool> (!T1->isNullPtrType() &&
 !T2->isNullPtrType() && "nullptr_t should be a null pointer constant"
) ? void (0) : __assert_fail ("!T1->isNullPtrType() && !T2->isNullPtrType() && \"nullptr_t should be a null pointer constant\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 5894, __extension__ __PRETTY_FUNCTION__));

//  - if T1 or T2 is "pointer to cv1 void" and the other type is
//    "pointer to cv2 T", "pointer to cv12 void", where cv12 is
//    the union of cv1 and cv2;
//  - if T1 or T2 is "pointer to noexcept function" and the other type is
//    "pointer to function", where the function types are otherwise the same,
//    "pointer to function";
//     FIXME: This rule is defective: it should also permit removing noexcept
//     from a pointer to member function.  As a Clang extension, we also
//     permit removing 'noreturn', so we generalize this rule to;
//     - [Clang] If T1 and T2 are both of type "pointer to function" or
//       "pointer to member function" and the pointee types can be unified
//       by a function pointer conversion, that conversion is applied
//       before checking the following rules.
//  - if T1 is "pointer to cv1 C1" and T2 is "pointer to cv2 C2", where C1
//    is reference-related to C2 or C2 is reference-related to C1 (8.6.3),
//    the cv-combined type of T1 and T2 or the cv-combined type of T2 and T1,
//    respectively;
//  - if T1 is "pointer to member of C1 of type cv1 U1" and T2 is "pointer
//    to member of C2 of type cv2 U2" where C1 is reference-related to C2 or
//    C2 is reference-related to C1 (8.6.3), the cv-combined type of T2 and
//    T1 or the cv-combined type of T1 and T2, respectively;
//  - if T1 and T2 are similar types (4.5), the cv-combined type of T1 and
//    T2;
//
// If looked at in the right way, these bullets all do the same thing.
// What we do here is, we build the two possible cv-combined types, and try
// the conversions in both directions. If only one works, or if the two
// composite types are the same, we have succeeded.
// FIXME: extended qualifiers?
//
// Note that this will fail to find a composite pointer type for "pointer
// to void" and "pointer to function". We can't actually perform the final
// conversion in this case, even though a composite pointer type formally
// exists.
SmallVector<unsigned, 4> QualifierUnion;
SmallVector<std::pair<const Type *, const Type *>, 4> MemberOfClass;
QualType Composite1 = T1;
QualType Composite2 = T2;
unsigned NeedConstBefore = 0;
while (true) {
  const PointerType *Ptr1, *Ptr2;
  if ((Ptr1 = Composite1->getAs<PointerType>()) &&
      (Ptr2 = Composite2->getAs<PointerType>())) {
    Composite1 = Ptr1->getPointeeType();
    Composite2 = Ptr2->getPointeeType();

    // If we're allowed to create a non-standard composite type, keep track
    // of where we need to fill in additional 'const' qualifiers.
    if (Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
      NeedConstBefore = QualifierUnion.size();

    QualifierUnion.push_back(
               Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
    MemberOfClass.push_back(std::make_pair(nullptr, nullptr));
    continue;
  }

  const MemberPointerType *MemPtr1, *MemPtr2;
  if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
      (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
    Composite1 = MemPtr1->getPointeeType();
    Composite2 = MemPtr2->getPointeeType();

    // If we're allowed to create a non-standard composite type, keep track
    // of where we need to fill in additional 'const' qualifiers.
    if (Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers())
      NeedConstBefore = QualifierUnion.size();

    QualifierUnion.push_back(
               Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
    MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
                                           MemPtr2->getClass()));
    continue;
  }

  // FIXME: block pointer types?

  // Cannot unwrap any more types.
  break;
}

// Apply the function pointer conversion to unify the types. We've already
// unwrapped down to the function types, and we want to merge rather than
// just convert, so do this ourselves rather than calling
// IsFunctionConversion.
//
// FIXME: In order to match the standard wording as closely as possible, we
// currently only do this under a single level of pointers. Ideally, we would
// allow this in general, and set NeedConstBefore to the relevant depth on
// the side(s) where we changed anything.
if (QualifierUnion.size() == 1) {
  if (auto *FPT1 = Composite1->getAs<FunctionProtoType>()) {
    if (auto *FPT2 = Composite2->getAs<FunctionProtoType>()) {
      FunctionProtoType::ExtProtoInfo EPI1 = FPT1->getExtProtoInfo();
      FunctionProtoType::ExtProtoInfo EPI2 = FPT2->getExtProtoInfo();

      // The result is noreturn if both operands are.
      bool Noreturn =
          EPI1.ExtInfo.getNoReturn() && EPI2.ExtInfo.getNoReturn();
      EPI1.ExtInfo = EPI1.ExtInfo.withNoReturn(Noreturn);
      EPI2.ExtInfo = EPI2.ExtInfo.withNoReturn(Noreturn);

      // The result is nothrow if both operands are.
      SmallVector<QualType, 8> ExceptionTypeStorage;
      EPI1.ExceptionSpec = EPI2.ExceptionSpec =
          mergeExceptionSpecs(*this, EPI1.ExceptionSpec, EPI2.ExceptionSpec,
                              ExceptionTypeStorage);

      Composite1 = Context.getFunctionType(FPT1->getReturnType(),
                                           FPT1->getParamTypes(), EPI1);
      Composite2 = Context.getFunctionType(FPT2->getReturnType(),
                                           FPT2->getParamTypes(), EPI2);
    }
  }
}

if (NeedConstBefore) {
  // Extension: Add 'const' to qualifiers that come before the first qualifier
  // mismatch, so that our (non-standard!) composite type meets the
  // requirements of C++ [conv.qual]p4 bullet 3.
  for (unsigned I = 0; I != NeedConstBefore; ++I)
    if ((QualifierUnion[I] & Qualifiers::Const) == 0)
      QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const;
}

// Rewrap the composites as pointers or member pointers with the union CVRs.
auto MOC = MemberOfClass.rbegin();
for (unsigned CVR : llvm::reverse(QualifierUnion)) {
  Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
  auto Classes = *MOC++;
  if (Classes.first && Classes.second) {
    // Rebuild member pointer type
    Composite1 = Context.getMemberPointerType(
        Context.getQualifiedType(Composite1, Quals), Classes.first);
    Composite2 = Context.getMemberPointerType(
        Context.getQualifiedType(Composite2, Quals), Classes.second);
  } else {
    // Rebuild pointer type
    Composite1 =
        Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
    Composite2 =
        Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
  }
}

struct Conversion {
  Sema &S;
  Expr *&E1, *&E2;
  QualType Composite;
  InitializedEntity Entity;
  InitializationKind Kind;
  InitializationSequence E1ToC, E2ToC;
  bool Viable;

  Conversion(Sema &S, SourceLocation Loc, Expr *&E1, Expr *&E2,
             QualType Composite)
      : S(S), E1(E1), E2(E2), Composite(Composite),
        Entity(InitializedEntity::InitializeTemporary(Composite)),
        Kind(InitializationKind::CreateCopy(Loc, SourceLocation())),
        E1ToC(S, Entity, Kind, E1), E2ToC(S, Entity, Kind, E2),
        Viable(E1ToC && E2ToC) {}

  bool perform() {
    ExprResult E1Result = E1ToC.Perform(S, Entity, Kind, E1);
    if (E1Result.isInvalid())
      return true;
    E1 = E1Result.getAs<Expr>();

    ExprResult E2Result = E2ToC.Perform(S, Entity, Kind, E2);
    if (E2Result.isInvalid())
      return true;
    E2 = E2Result.getAs<Expr>();

    return false;
  }
};

// Try to convert to each composite pointer type.
Conversion C1(*this, Loc, E1, E2, Composite1);
if (C1.Viable && Context.hasSameType(Composite1, Composite2)) {
  if (ConvertArgs && C1.perform())
    return QualType();
  return C1.Composite;
}
Conversion C2(*this, Loc, E1, E2, Composite2);

if (C1.Viable == C2.Viable) {
  // Either Composite1 and Composite2 are viable and are different, or
  // neither is viable.
  // FIXME: How both be viable and different?
  return QualType();
}

// Convert to the chosen type.
if (ConvertArgs && (C1.Viable ? C1 : C2).perform())
  return QualType();

return C1.Viable ? C1.Composite : C2.Composite;
6094}

6096ExprResult Sema::MaybeBindToTemporary(Expr *E) {
if (!E)
  return ExprError();

assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?")(static_cast <bool> (!isa<CXXBindTemporaryExpr>(E
) && "Double-bound temporary?") ? void (0) : __assert_fail
 ("!isa<CXXBindTemporaryExpr>(E) && \"Double-bound temporary?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6100, __extension__ __PRETTY_FUNCTION__));

// If the result is a glvalue, we shouldn't bind it.
if (!E->isRValue())
  return E;

// In ARC, calls that return a retainable type can return retained,
// in which case we have to insert a consuming cast.
if (getLangOpts().ObjCAutoRefCount &&
    E->getType()->isObjCRetainableType()) {

  bool ReturnsRetained;

  // For actual calls, we compute this by examining the type of the
  // called value.
  if (CallExpr *Call = dyn_cast<CallExpr>(E)) {
    Expr *Callee = Call->getCallee()->IgnoreParens();
    QualType T = Callee->getType();

    if (T == Context.BoundMemberTy) {
      // Handle pointer-to-members.
      if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Callee))
        T = BinOp->getRHS()->getType();
      else if (MemberExpr *Mem = dyn_cast<MemberExpr>(Callee))
        T = Mem->getMemberDecl()->getType();
    }

    if (const PointerType *Ptr = T->getAs<PointerType>())
      T = Ptr->getPointeeType();
    else if (const BlockPointerType *Ptr = T->getAs<BlockPointerType>())
      T = Ptr->getPointeeType();
    else if (const MemberPointerType *MemPtr = T->getAs<MemberPointerType>())
      T = MemPtr->getPointeeType();

    const FunctionType *FTy = T->getAs<FunctionType>();
    assert(FTy && "call to value not of function type?")(static_cast <bool> (FTy && "call to value not of function type?"
) ? void (0) : __assert_fail ("FTy && \"call to value not of function type?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6135, __extension__ __PRETTY_FUNCTION__));
    ReturnsRetained = FTy->getExtInfo().getProducesResult();

  // ActOnStmtExpr arranges things so that StmtExprs of retainable
  // type always produce a +1 object.
  } else if (isa<StmtExpr>(E)) {
    ReturnsRetained = true;

  // We hit this case with the lambda conversion-to-block optimization;
  // we don't want any extra casts here.
  } else if (isa<CastExpr>(E) &&
             isa<BlockExpr>(cast<CastExpr>(E)->getSubExpr())) {
    return E;

  // For message sends and property references, we try to find an
  // actual method.  FIXME: we should infer retention by selector in
  // cases where we don't have an actual method.
  } else {
    ObjCMethodDecl *D = nullptr;
    if (ObjCMessageExpr *Send = dyn_cast<ObjCMessageExpr>(E)) {
      D = Send->getMethodDecl();
    } else if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(E)) {
      D = BoxedExpr->getBoxingMethod();
    } else if (ObjCArrayLiteral *ArrayLit = dyn_cast<ObjCArrayLiteral>(E)) {
      // Don't do reclaims if we're using the zero-element array
      // constant.
      if (ArrayLit->getNumElements() == 0 &&
          Context.getLangOpts().ObjCRuntime.hasEmptyCollections())
        return E;

      D = ArrayLit->getArrayWithObjectsMethod();
    } else if (ObjCDictionaryLiteral *DictLit
                                      = dyn_cast<ObjCDictionaryLiteral>(E)) {
      // Don't do reclaims if we're using the zero-element dictionary
      // constant.
      if (DictLit->getNumElements() == 0 &&
          Context.getLangOpts().ObjCRuntime.hasEmptyCollections())
        return E;

      D = DictLit->getDictWithObjectsMethod();
    }

    ReturnsRetained = (D && D->hasAttr<NSReturnsRetainedAttr>());

    // Don't do reclaims on performSelector calls; despite their
    // return type, the invoked method doesn't necessarily actually
    // return an object.
    if (!ReturnsRetained &&
        D && D->getMethodFamily() == OMF_performSelector)
      return E;
  }

  // Don't reclaim an object of Class type.
  if (!ReturnsRetained && E->getType()->isObjCARCImplicitlyUnretainedType())
    return E;

  Cleanup.setExprNeedsCleanups(true);

  CastKind ck = (ReturnsRetained ? CK_ARCConsumeObject
                                 : CK_ARCReclaimReturnedObject);
  return ImplicitCastExpr::Create(Context, E->getType(), ck, E, nullptr,
                                  VK_RValue);
}

if (!getLangOpts().CPlusPlus)
  return E;

// Search for the base element type (cf. ASTContext::getBaseElementType) with
// a fast path for the common case that the type is directly a RecordType.
const Type *T = Context.getCanonicalType(E->getType().getTypePtr());
const RecordType *RT = nullptr;
while (!RT) {
  switch (T->getTypeClass()) {
  case Type::Record:
    RT = cast<RecordType>(T);
    break;
  case Type::ConstantArray:
  case Type::IncompleteArray:
  case Type::VariableArray:
  case Type::DependentSizedArray:
    T = cast<ArrayType>(T)->getElementType().getTypePtr();
    break;
  default:
    return E;
  }
}

// That should be enough to guarantee that this type is complete, if we're
// not processing a decltype expression.
CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
if (RD->isInvalidDecl() || RD->isDependentContext())
  return E;

bool IsDecltype = ExprEvalContexts.back().IsDecltype;
CXXDestructorDecl *Destructor = IsDecltype ? nullptr : LookupDestructor(RD);

if (Destructor) {
  MarkFunctionReferenced(E->getExprLoc(), Destructor);
  CheckDestructorAccess(E->getExprLoc(), Destructor,
                        PDiag(diag::err_access_dtor_temp)
                          << E->getType());
  if (DiagnoseUseOfDecl(Destructor, E->getExprLoc()))
    return ExprError();

  // If destructor is trivial, we can avoid the extra copy.
  if (Destructor->isTrivial())
    return E;

  // We need a cleanup, but we don't need to remember the temporary.
  Cleanup.setExprNeedsCleanups(true);
}

CXXTemporary *Temp = CXXTemporary::Create(Context, Destructor);
CXXBindTemporaryExpr *Bind = CXXBindTemporaryExpr::Create(Context, Temp, E);

if (IsDecltype)
  ExprEvalContexts.back().DelayedDecltypeBinds.push_back(Bind);

return Bind;
6254}

6256ExprResult
6257Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) {
if (SubExpr.isInvalid())
  return ExprError();

return MaybeCreateExprWithCleanups(SubExpr.get());
6262}

6264Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) {
assert(SubExpr && "subexpression can't be null!")(static_cast <bool> (SubExpr && "subexpression can't be null!"
) ? void (0) : __assert_fail ("SubExpr && \"subexpression can't be null!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6265, __extension__ __PRETTY_FUNCTION__));

CleanupVarDeclMarking();

unsigned FirstCleanup = ExprEvalContexts.back().NumCleanupObjects;
assert(ExprCleanupObjects.size() >= FirstCleanup)(static_cast <bool> (ExprCleanupObjects.size() >= FirstCleanup
) ? void (0) : __assert_fail ("ExprCleanupObjects.size() >= FirstCleanup"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6270, __extension__ __PRETTY_FUNCTION__));
assert(Cleanup.exprNeedsCleanups() ||(static_cast <bool> (Cleanup.exprNeedsCleanups() || ExprCleanupObjects
.size() == FirstCleanup) ? void (0) : __assert_fail ("Cleanup.exprNeedsCleanups() || ExprCleanupObjects.size() == FirstCleanup"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6272, __extension__ __PRETTY_FUNCTION__))
       ExprCleanupObjects.size() == FirstCleanup)(static_cast <bool> (Cleanup.exprNeedsCleanups() || ExprCleanupObjects
.size() == FirstCleanup) ? void (0) : __assert_fail ("Cleanup.exprNeedsCleanups() || ExprCleanupObjects.size() == FirstCleanup"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6272, __extension__ __PRETTY_FUNCTION__));
if (!Cleanup.exprNeedsCleanups())
  return SubExpr;

auto Cleanups = llvm::makeArrayRef(ExprCleanupObjects.begin() + FirstCleanup,
                                   ExprCleanupObjects.size() - FirstCleanup);

auto *E = ExprWithCleanups::Create(
    Context, SubExpr, Cleanup.cleanupsHaveSideEffects(), Cleanups);
DiscardCleanupsInEvaluationContext();

return E;
6284}

6286Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) {
assert(SubStmt && "sub-statement can't be null!")(static_cast <bool> (SubStmt && "sub-statement can't be null!"
) ? void (0) : __assert_fail ("SubStmt && \"sub-statement can't be null!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6287, __extension__ __PRETTY_FUNCTION__));

CleanupVarDeclMarking();

if (!Cleanup.exprNeedsCleanups())
  return SubStmt;

// FIXME: In order to attach the temporaries, wrap the statement into
// a StmtExpr; currently this is only used for asm statements.
// This is hacky, either create a new CXXStmtWithTemporaries statement or
// a new AsmStmtWithTemporaries.
CompoundStmt *CompStmt = CompoundStmt::Create(
    Context, SubStmt, SourceLocation(), SourceLocation());
Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(),
                                 SourceLocation());
return MaybeCreateExprWithCleanups(E);
6303}

6305/// Process the expression contained within a decltype. For such expressions,
6306/// certain semantic checks on temporaries are delayed until this point, and
6307/// are omitted for the 'topmost' call in the decltype expression. If the
6308/// topmost call bound a temporary, strip that temporary off the expression.
6309ExprResult Sema::ActOnDecltypeExpression(Expr *E) {
assert(ExprEvalContexts.back().IsDecltype && "not in a decltype expression")(static_cast <bool> (ExprEvalContexts.back().IsDecltype
 && "not in a decltype expression") ? void (0) : __assert_fail
 ("ExprEvalContexts.back().IsDecltype && \"not in a decltype expression\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6310, __extension__ __PRETTY_FUNCTION__));

// C++11 [expr.call]p11:
//   If a function call is a prvalue of object type,
// -- if the function call is either
//   -- the operand of a decltype-specifier, or
//   -- the right operand of a comma operator that is the operand of a
//      decltype-specifier,
//   a temporary object is not introduced for the prvalue.

// Recursively rebuild ParenExprs and comma expressions to strip out the
// outermost CXXBindTemporaryExpr, if any.
if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
  ExprResult SubExpr = ActOnDecltypeExpression(PE->getSubExpr());
  if (SubExpr.isInvalid())
    return ExprError();
  if (SubExpr.get() == PE->getSubExpr())
    return E;
  return ActOnParenExpr(PE->getLParen(), PE->getRParen(), SubExpr.get());
}
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
  if (BO->getOpcode() == BO_Comma) {
    ExprResult RHS = ActOnDecltypeExpression(BO->getRHS());
    if (RHS.isInvalid())
      return ExprError();
    if (RHS.get() == BO->getRHS())
      return E;
    return new (Context) BinaryOperator(
        BO->getLHS(), RHS.get(), BO_Comma, BO->getType(), BO->getValueKind(),
        BO->getObjectKind(), BO->getOperatorLoc(), BO->getFPFeatures());
  }
}

CXXBindTemporaryExpr *TopBind = dyn_cast<CXXBindTemporaryExpr>(E);
CallExpr *TopCall = TopBind ? dyn_cast<CallExpr>(TopBind->getSubExpr())
                            : nullptr;
if (TopCall)
  E = TopCall;
else
  TopBind = nullptr;

// Disable the special decltype handling now.
ExprEvalContexts.back().IsDecltype = false;

// In MS mode, don't perform any extra checking of call return types within a
// decltype expression.
if (getLangOpts().MSVCCompat)
  return E;

// Perform the semantic checks we delayed until this point.
for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeCalls.size();
     I != N; ++I) {
  CallExpr *Call = ExprEvalContexts.back().DelayedDecltypeCalls[I];
  if (Call == TopCall)
    continue;

  if (CheckCallReturnType(Call->getCallReturnType(Context),
                          Call->getLocStart(),
                          Call, Call->getDirectCallee()))
    return ExprError();
}

// Now all relevant types are complete, check the destructors are accessible
// and non-deleted, and annotate them on the temporaries.
for (unsigned I = 0, N = ExprEvalContexts.back().DelayedDecltypeBinds.size();
     I != N; ++I) {
  CXXBindTemporaryExpr *Bind =
    ExprEvalContexts.back().DelayedDecltypeBinds[I];
  if (Bind == TopBind)
    continue;

  CXXTemporary *Temp = Bind->getTemporary();

  CXXRecordDecl *RD =
    Bind->getType()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
  CXXDestructorDecl *Destructor = LookupDestructor(RD);
  Temp->setDestructor(Destructor);

  MarkFunctionReferenced(Bind->getExprLoc(), Destructor);
  CheckDestructorAccess(Bind->getExprLoc(), Destructor,
                        PDiag(diag::err_access_dtor_temp)
                          << Bind->getType());
  if (DiagnoseUseOfDecl(Destructor, Bind->getExprLoc()))
    return ExprError();

  // We need a cleanup, but we don't need to remember the temporary.
  Cleanup.setExprNeedsCleanups(true);
}

// Possibly strip off the top CXXBindTemporaryExpr.
return E;
6401}

6403/// Note a set of 'operator->' functions that were used for a member access.
6404static void noteOperatorArrows(Sema &S,
                             ArrayRef<FunctionDecl *> OperatorArrows) {
unsigned SkipStart = OperatorArrows.size(), SkipCount = 0;
// FIXME: Make this configurable?
unsigned Limit = 9;
if (OperatorArrows.size() > Limit) {
  // Produce Limit-1 normal notes and one 'skipping' note.
  SkipStart = (Limit - 1) / 2 + (Limit - 1) % 2;
  SkipCount = OperatorArrows.size() - (Limit - 1);
}

for (unsigned I = 0; I < OperatorArrows.size(); /**/) {
  if (I == SkipStart) {
    S.Diag(OperatorArrows[I]->getLocation(),
           diag::note_operator_arrows_suppressed)
        << SkipCount;
    I += SkipCount;
  } else {
    S.Diag(OperatorArrows[I]->getLocation(), diag::note_operator_arrow_here)
        << OperatorArrows[I]->getCallResultType();
    ++I;
  }
}
6427}

6429ExprResult Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base,
                                            SourceLocation OpLoc,
                                            tok::TokenKind OpKind,
                                            ParsedType &ObjectType,
                                            bool &MayBePseudoDestructor) {
// Since this might be a postfix expression, get rid of ParenListExprs.
ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
if (Result.isInvalid()) return ExprError();
Base = Result.get();

Result = CheckPlaceholderExpr(Base);
if (Result.isInvalid()) return ExprError();
Base = Result.get();

QualType BaseType = Base->getType();
MayBePseudoDestructor = false;
if (BaseType->isDependentType()) {
  // If we have a pointer to a dependent type and are using the -> operator,
  // the object type is the type that the pointer points to. We might still
  // have enough information about that type to do something useful.
  if (OpKind == tok::arrow)
    if (const PointerType *Ptr = BaseType->getAs<PointerType>())
      BaseType = Ptr->getPointeeType();

  ObjectType = ParsedType::make(BaseType);
  MayBePseudoDestructor = true;
  return Base;
}

// C++ [over.match.oper]p8:
//   [...] When operator->returns, the operator-> is applied  to the value
//   returned, with the original second operand.
if (OpKind == tok::arrow) {
  QualType StartingType = BaseType;
  bool NoArrowOperatorFound = false;
  bool FirstIteration = true;
  FunctionDecl *CurFD = dyn_cast<FunctionDecl>(CurContext);
  // The set of types we've considered so far.
  llvm::SmallPtrSet<CanQualType,8> CTypes;
  SmallVector<FunctionDecl*, 8> OperatorArrows;
  CTypes.insert(Context.getCanonicalType(BaseType));

  while (BaseType->isRecordType()) {
    if (OperatorArrows.size() >= getLangOpts().ArrowDepth) {
      Diag(OpLoc, diag::err_operator_arrow_depth_exceeded)
        << StartingType << getLangOpts().ArrowDepth << Base->getSourceRange();
      noteOperatorArrows(*this, OperatorArrows);
      Diag(OpLoc, diag::note_operator_arrow_depth)
        << getLangOpts().ArrowDepth;
      return ExprError();
    }

    Result = BuildOverloadedArrowExpr(
        S, Base, OpLoc,
        // When in a template specialization and on the first loop iteration,
        // potentially give the default diagnostic (with the fixit in a
        // separate note) instead of having the error reported back to here
        // and giving a diagnostic with a fixit attached to the error itself.
        (FirstIteration && CurFD && CurFD->isFunctionTemplateSpecialization())
            ? nullptr
            : &NoArrowOperatorFound);
    if (Result.isInvalid()) {
      if (NoArrowOperatorFound) {
        if (FirstIteration) {
          Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
            << BaseType << 1 << Base->getSourceRange()
            << FixItHint::CreateReplacement(OpLoc, ".");
          OpKind = tok::period;
          break;
        }
        Diag(OpLoc, diag::err_typecheck_member_reference_arrow)
          << BaseType << Base->getSourceRange();
        CallExpr *CE = dyn_cast<CallExpr>(Base);
        if (Decl *CD = (CE ? CE->getCalleeDecl() : nullptr)) {
          Diag(CD->getLocStart(),
               diag::note_member_reference_arrow_from_operator_arrow);
        }
      }
      return ExprError();
    }
    Base = Result.get();
    if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base))
      OperatorArrows.push_back(OpCall->getDirectCallee());
    BaseType = Base->getType();
    CanQualType CBaseType = Context.getCanonicalType(BaseType);
    if (!CTypes.insert(CBaseType).second) {
      Diag(OpLoc, diag::err_operator_arrow_circular) << StartingType;
      noteOperatorArrows(*this, OperatorArrows);
      return ExprError();
    }
    FirstIteration = false;
  }

  if (OpKind == tok::arrow &&
      (BaseType->isPointerType() || BaseType->isObjCObjectPointerType()))
    BaseType = BaseType->getPointeeType();
}

// Objective-C properties allow "." access on Objective-C pointer types,
// so adjust the base type to the object type itself.
if (BaseType->isObjCObjectPointerType())
  BaseType = BaseType->getPointeeType();

// C++ [basic.lookup.classref]p2:
//   [...] If the type of the object expression is of pointer to scalar
//   type, the unqualified-id is looked up in the context of the complete
//   postfix-expression.
//
// This also indicates that we could be parsing a pseudo-destructor-name.
// Note that Objective-C class and object types can be pseudo-destructor
// expressions or normal member (ivar or property) access expressions, and
// it's legal for the type to be incomplete if this is a pseudo-destructor
// call.  We'll do more incomplete-type checks later in the lookup process,
// so just skip this check for ObjC types.
if (BaseType->isObjCObjectOrInterfaceType()) {
  ObjectType = ParsedType::make(BaseType);
  MayBePseudoDestructor = true;
  return Base;
} else if (!BaseType->isRecordType()) {
  ObjectType = nullptr;
  MayBePseudoDestructor = true;
  return Base;
}

// The object type must be complete (or dependent), or
// C++11 [expr.prim.general]p3:
//   Unlike the object expression in other contexts, *this is not required to
//   be of complete type for purposes of class member access (5.2.5) outside
//   the member function body.
if (!BaseType->isDependentType() &&
    !isThisOutsideMemberFunctionBody(BaseType) &&
    RequireCompleteType(OpLoc, BaseType, diag::err_incomplete_member_access))
  return ExprError();

// C++ [basic.lookup.classref]p2:
//   If the id-expression in a class member access (5.2.5) is an
//   unqualified-id, and the type of the object expression is of a class
//   type C (or of pointer to a class type C), the unqualified-id is looked
//   up in the scope of class C. [...]
ObjectType = ParsedType::make(BaseType);
return Base;
6570}

6572static bool CheckArrow(Sema& S, QualType& ObjectType, Expr *&Base,
                 tok::TokenKind& OpKind, SourceLocation OpLoc) {
if (Base->hasPlaceholderType()) {
  ExprResult result = S.CheckPlaceholderExpr(Base);
  if (result.isInvalid()) return true;
  Base = result.get();
}
ObjectType = Base->getType();

// C++ [expr.pseudo]p2:
//   The left-hand side of the dot operator shall be of scalar type. The
//   left-hand side of the arrow operator shall be of pointer to scalar type.
//   This scalar type is the object type.
// Note that this is rather different from the normal handling for the
// arrow operator.
if (OpKind == tok::arrow) {
  if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) {
    ObjectType = Ptr->getPointeeType();
  } else if (!Base->isTypeDependent()) {
    // The user wrote "p->" when they probably meant "p."; fix it.
    S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
      << ObjectType << true
      << FixItHint::CreateReplacement(OpLoc, ".");
    if (S.isSFINAEContext())
      return true;

    OpKind = tok::period;
  }
}

return false;
6603}

6605/// \brief Check if it's ok to try and recover dot pseudo destructor calls on
6606/// pointer objects.
6607static bool
6608canRecoverDotPseudoDestructorCallsOnPointerObjects(Sema &SemaRef,
                                                 QualType DestructedType) {
// If this is a record type, check if its destructor is callable.
if (auto *RD = DestructedType->getAsCXXRecordDecl()) {
  if (CXXDestructorDecl *D = SemaRef.LookupDestructor(RD))
    return SemaRef.CanUseDecl(D, /*TreatUnavailableAsInvalid=*/false);
  return false;
}

// Otherwise, check if it's a type for which it's valid to use a pseudo-dtor.
return DestructedType->isDependentType() || DestructedType->isScalarType() ||
       DestructedType->isVectorType();
6620}

6622ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
                                         SourceLocation OpLoc,
                                         tok::TokenKind OpKind,
                                         const CXXScopeSpec &SS,
                                         TypeSourceInfo *ScopeTypeInfo,
                                         SourceLocation CCLoc,
                                         SourceLocation TildeLoc,
                                       PseudoDestructorTypeStorage Destructed) {
TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();

QualType ObjectType;
if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
  return ExprError();

if (!ObjectType->isDependentType() && !ObjectType->isScalarType() &&
    !ObjectType->isVectorType()) {
  if (getLangOpts().MSVCCompat && ObjectType->isVoidType())
    Diag(OpLoc, diag::ext_pseudo_dtor_on_void) << Base->getSourceRange();
  else {
    Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar)
      << ObjectType << Base->getSourceRange();
    return ExprError();
  }
}

// C++ [expr.pseudo]p2:
//   [...] The cv-unqualified versions of the object type and of the type
//   designated by the pseudo-destructor-name shall be the same type.
if (DestructedTypeInfo) {
  QualType DestructedType = DestructedTypeInfo->getType();
  SourceLocation DestructedTypeStart
    = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin();
  if (!DestructedType->isDependentType() && !ObjectType->isDependentType()) {
    if (!Context.hasSameUnqualifiedType(DestructedType, ObjectType)) {
      // Detect dot pseudo destructor calls on pointer objects, e.g.:
      //   Foo *foo;
      //   foo.~Foo();
      if (OpKind == tok::period && ObjectType->isPointerType() &&
          Context.hasSameUnqualifiedType(DestructedType,
                                         ObjectType->getPointeeType())) {
        auto Diagnostic =
            Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
            << ObjectType << /*IsArrow=*/0 << Base->getSourceRange();

        // Issue a fixit only when the destructor is valid.
        if (canRecoverDotPseudoDestructorCallsOnPointerObjects(
                *this, DestructedType))
          Diagnostic << FixItHint::CreateReplacement(OpLoc, "->");

        // Recover by setting the object type to the destructed type and the
        // operator to '->'.
        ObjectType = DestructedType;
        OpKind = tok::arrow;
      } else {
        Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch)
            << ObjectType << DestructedType << Base->getSourceRange()
            << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();

        // Recover by setting the destructed type to the object type.
        DestructedType = ObjectType;
        DestructedTypeInfo =
            Context.getTrivialTypeSourceInfo(ObjectType, DestructedTypeStart);
        Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
      }
    } else if (DestructedType.getObjCLifetime() !=
                                              ObjectType.getObjCLifetime()) {

      if (DestructedType.getObjCLifetime() == Qualifiers::OCL_None) {
        // Okay: just pretend that the user provided the correctly-qualified
        // type.
      } else {
        Diag(DestructedTypeStart, diag::err_arc_pseudo_dtor_inconstant_quals)
          << ObjectType << DestructedType << Base->getSourceRange()
          << DestructedTypeInfo->getTypeLoc().getLocalSourceRange();
      }

      // Recover by setting the destructed type to the object type.
      DestructedType = ObjectType;
      DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType,
                                                         DestructedTypeStart);
      Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
    }
  }
}

// C++ [expr.pseudo]p2:
//   [...] Furthermore, the two type-names in a pseudo-destructor-name of the
//   form
//
//     ::[opt] nested-name-specifier[opt] type-name :: ~ type-name
//
//   shall designate the same scalar type.
if (ScopeTypeInfo) {
  QualType ScopeType = ScopeTypeInfo->getType();
  if (!ScopeType->isDependentType() && !ObjectType->isDependentType() &&
      !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) {

    Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(),
         diag::err_pseudo_dtor_type_mismatch)
      << ObjectType << ScopeType << Base->getSourceRange()
      << ScopeTypeInfo->getTypeLoc().getLocalSourceRange();

    ScopeType = QualType();
    ScopeTypeInfo = nullptr;
  }
}

Expr *Result
  = new (Context) CXXPseudoDestructorExpr(Context, Base,
                                          OpKind == tok::arrow, OpLoc,
                                          SS.getWithLocInContext(Context),
                                          ScopeTypeInfo,
                                          CCLoc,
                                          TildeLoc,
                                          Destructed);

return Result;
6739}

6741ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                         SourceLocation OpLoc,
                                         tok::TokenKind OpKind,
                                         CXXScopeSpec &SS,
                                         UnqualifiedId &FirstTypeName,
                                         SourceLocation CCLoc,
                                         SourceLocation TildeLoc,
                                         UnqualifiedId &SecondTypeName) {
assert((FirstTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId ||(static_cast <bool> ((FirstTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid first type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(FirstTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid first type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6751, __extension__ __PRETTY_FUNCTION__))
        FirstTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) &&(static_cast <bool> ((FirstTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid first type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(FirstTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid first type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6751, __extension__ __PRETTY_FUNCTION__))
       "Invalid first type name in pseudo-destructor")(static_cast <bool> ((FirstTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid first type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(FirstTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || FirstTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid first type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6751, __extension__ __PRETTY_FUNCTION__));
assert((SecondTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId ||(static_cast <bool> ((SecondTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid second type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(SecondTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid second type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6754, __extension__ __PRETTY_FUNCTION__))
        SecondTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) &&(static_cast <bool> ((SecondTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid second type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(SecondTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid second type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6754, __extension__ __PRETTY_FUNCTION__))
       "Invalid second type name in pseudo-destructor")(static_cast <bool> ((SecondTypeName.getKind() == UnqualifiedIdKind
::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind
::IK_Identifier) && "Invalid second type name in pseudo-destructor"
) ? void (0) : __assert_fail ("(SecondTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId || SecondTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) && \"Invalid second type name in pseudo-destructor\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 6754, __extension__ __PRETTY_FUNCTION__));

QualType ObjectType;
if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
  return ExprError();

// Compute the object type that we should use for name lookup purposes. Only
// record types and dependent types matter.
ParsedType ObjectTypePtrForLookup;
if (!SS.isSet()) {
  if (ObjectType->isRecordType())
    ObjectTypePtrForLookup = ParsedType::make(ObjectType);
  else if (ObjectType->isDependentType())
    ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
}

// Convert the name of the type being destructed (following the ~) into a
// type (with source-location information).
QualType DestructedType;
TypeSourceInfo *DestructedTypeInfo = nullptr;
PseudoDestructorTypeStorage Destructed;
if (SecondTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) {
  ParsedType T = getTypeName(*SecondTypeName.Identifier,
                             SecondTypeName.StartLocation,
                             S, &SS, true, false, ObjectTypePtrForLookup,
                             /*IsCtorOrDtorName*/true);
  if (!T &&
      ((SS.isSet() && !computeDeclContext(SS, false)) ||
       (!SS.isSet() && ObjectType->isDependentType()))) {
    // The name of the type being destroyed is a dependent name, and we
    // couldn't find anything useful in scope. Just store the identifier and
    // it's location, and we'll perform (qualified) name lookup again at
    // template instantiation time.
    Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier,
                                             SecondTypeName.StartLocation);
  } else if (!T) {
    Diag(SecondTypeName.StartLocation,
         diag::err_pseudo_dtor_destructor_non_type)
      << SecondTypeName.Identifier << ObjectType;
    if (isSFINAEContext())
      return ExprError();

    // Recover by assuming we had the right type all along.
    DestructedType = ObjectType;
  } else
    DestructedType = GetTypeFromParser(T, &DestructedTypeInfo);
} else {
  // Resolve the template-id to a type.
  TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId;
  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                     TemplateId->NumArgs);
  TypeResult T = ActOnTemplateIdType(TemplateId->SS,
                                     TemplateId->TemplateKWLoc,
                                     TemplateId->Template,
                                     TemplateId->Name,
                                     TemplateId->TemplateNameLoc,
                                     TemplateId->LAngleLoc,
                                     TemplateArgsPtr,
                                     TemplateId->RAngleLoc,
                                     /*IsCtorOrDtorName*/true);
  if (T.isInvalid() || !T.get()) {
    // Recover by assuming we had the right type all along.
    DestructedType = ObjectType;
  } else
    DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo);
}

// If we've performed some kind of recovery, (re-)build the type source
// information.
if (!DestructedType.isNull()) {
  if (!DestructedTypeInfo)
    DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType,
                                                SecondTypeName.StartLocation);
  Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo);
}

// Convert the name of the scope type (the type prior to '::') into a type.
TypeSourceInfo *ScopeTypeInfo = nullptr;
QualType ScopeType;
if (FirstTypeName.getKind() == UnqualifiedIdKind::IK_TemplateId ||
    FirstTypeName.Identifier) {
  if (FirstTypeName.getKind() == UnqualifiedIdKind::IK_Identifier) {
    ParsedType T = getTypeName(*FirstTypeName.Identifier,
                               FirstTypeName.StartLocation,
                               S, &SS, true, false, ObjectTypePtrForLookup,
                               /*IsCtorOrDtorName*/true);
    if (!T) {
      Diag(FirstTypeName.StartLocation,
           diag::err_pseudo_dtor_destructor_non_type)
        << FirstTypeName.Identifier << ObjectType;

      if (isSFINAEContext())
        return ExprError();

      // Just drop this type. It's unnecessary anyway.
      ScopeType = QualType();
    } else
      ScopeType = GetTypeFromParser(T, &ScopeTypeInfo);
  } else {
    // Resolve the template-id to a type.
    TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId;
    ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
                                       TemplateId->NumArgs);
    TypeResult T = ActOnTemplateIdType(TemplateId->SS,
                                       TemplateId->TemplateKWLoc,
                                       TemplateId->Template,
                                       TemplateId->Name,
                                       TemplateId->TemplateNameLoc,
                                       TemplateId->LAngleLoc,
                                       TemplateArgsPtr,
                                       TemplateId->RAngleLoc,
                                       /*IsCtorOrDtorName*/true);
    if (T.isInvalid() || !T.get()) {
      // Recover by dropping this type.
      ScopeType = QualType();
    } else
      ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo);
  }
}

if (!ScopeType.isNull() && !ScopeTypeInfo)
  ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType,
                                                FirstTypeName.StartLocation);


return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS,
                                 ScopeTypeInfo, CCLoc, TildeLoc,
                                 Destructed);
6882}

6884ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                         SourceLocation OpLoc,
                                         tok::TokenKind OpKind,
                                         SourceLocation TildeLoc,
                                         const DeclSpec& DS) {
QualType ObjectType;
if (CheckArrow(*this, ObjectType, Base, OpKind, OpLoc))
  return ExprError();

QualType T = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc(),
                               false);

TypeLocBuilder TLB;
DecltypeTypeLoc DecltypeTL = TLB.push<DecltypeTypeLoc>(T);
DecltypeTL.setNameLoc(DS.getTypeSpecTypeLoc());
TypeSourceInfo *DestructedTypeInfo = TLB.getTypeSourceInfo(Context, T);
PseudoDestructorTypeStorage Destructed(DestructedTypeInfo);

return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, CXXScopeSpec(),
                                 nullptr, SourceLocation(), TildeLoc,
                                 Destructed);
6905}

6907ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl,
                                      CXXConversionDecl *Method,
                                      bool HadMultipleCandidates) {
if (Method->getParent()->isLambda() &&
    Method->getConversionType()->isBlockPointerType()) {
  // This is a lambda coversion to block pointer; check if the argument
  // is a LambdaExpr.
  Expr *SubE = E;
  CastExpr *CE = dyn_cast<CastExpr>(SubE);
  if (CE && CE->getCastKind() == CK_NoOp)
    SubE = CE->getSubExpr();
  SubE = SubE->IgnoreParens();
  if (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(SubE))
    SubE = BE->getSubExpr();
  if (isa<LambdaExpr>(SubE)) {
    // For the conversion to block pointer on a lambda expression, we
    // construct a special BlockLiteral instead; this doesn't really make
    // a difference in ARC, but outside of ARC the resulting block literal
    // follows the normal lifetime rules for block literals instead of being
    // autoreleased.
    DiagnosticErrorTrap Trap(Diags);
    PushExpressionEvaluationContext(
        ExpressionEvaluationContext::PotentiallyEvaluated);
    ExprResult Exp = BuildBlockForLambdaConversion(E->getExprLoc(),
                                                   E->getExprLoc(),
                                                   Method, E);
    PopExpressionEvaluationContext();

    if (Exp.isInvalid())
      Diag(E->getExprLoc(), diag::note_lambda_to_block_conv);
    return Exp;
  }
}

ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/nullptr,
                                        FoundDecl, Method);
if (Exp.isInvalid())
  return true;

MemberExpr *ME = new (Context) MemberExpr(
    Exp.get(), /*IsArrow=*/false, SourceLocation(), Method, SourceLocation(),
    Context.BoundMemberTy, VK_RValue, OK_Ordinary);
if (HadMultipleCandidates)
  ME->setHadMultipleCandidates(true);
MarkMemberReferenced(ME);

QualType ResultType = Method->getReturnType();
ExprValueKind VK = Expr::getValueKindForType(ResultType);
ResultType = ResultType.getNonLValueExprType(Context);

CXXMemberCallExpr *CE =
  new (Context) CXXMemberCallExpr(Context, ME, None, ResultType, VK,
                                  Exp.get()->getLocEnd());

if (CheckFunctionCall(Method, CE,
                      Method->getType()->castAs<FunctionProtoType>()))
  return ExprError();

return CE;
6966}

6968ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
                                    SourceLocation RParen) {
// If the operand is an unresolved lookup expression, the expression is ill-
// formed per [over.over]p1, because overloaded function names cannot be used
// without arguments except in explicit contexts.
ExprResult R = CheckPlaceholderExpr(Operand);
if (R.isInvalid())
  return R;

// The operand may have been modified when checking the placeholder type.
Operand = R.get();

if (!inTemplateInstantiation() && Operand->HasSideEffects(Context, false)) {
  // The expression operand for noexcept is in an unevaluated expression
  // context, so side effects could result in unintended consequences.
  Diag(Operand->getExprLoc(), diag::warn_side_effects_unevaluated_context);
}

CanThrowResult CanThrow = canThrow(Operand);
return new (Context)
    CXXNoexceptExpr(Context.BoolTy, Operand, CanThrow, KeyLoc, RParen);
6989}

6991ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation,
                                 Expr *Operand, SourceLocation RParen) {
return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen);
6994}

6996static bool IsSpecialDiscardedValue(Expr *E) {
// In C++11, discarded-value expressions of a certain form are special,
// according to [expr]p10:
//   The lvalue-to-rvalue conversion (4.1) is applied only if the
//   expression is an lvalue of volatile-qualified type and it has
//   one of the following forms:
E = E->IgnoreParens();

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

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

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

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

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

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

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

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

return false;
7049}

7051/// Perform the conversions required for an expression used in a
7052/// context that ignores the result.
7053ExprResult Sema::IgnoredValueConversions(Expr *E) {
if (E->hasPlaceholderType()) {
  ExprResult result = CheckPlaceholderExpr(E);
  if (result.isInvalid()) return E;
  E = result.get();
}

// C99 6.3.2.1:
//   [Except in specific positions,] an lvalue that does not have
//   array type is converted to the value stored in the
//   designated object (and is no longer an lvalue).
if (E->isRValue()) {
  // In C, function designators (i.e. expressions of function type)
  // are r-values, but we still want to do function-to-pointer decay
  // on them.  This is both technically correct and convenient for
  // some clients.
  if (!getLangOpts().CPlusPlus && E->getType()->isFunctionType())
    return DefaultFunctionArrayConversion(E);

  return E;
}

if (getLangOpts().CPlusPlus)  {
  // The C++11 standard defines the notion of a discarded-value expression;
  // normally, we don't need to do anything to handle it, but if it is a
  // volatile lvalue with a special form, we perform an lvalue-to-rvalue
  // conversion.
  if (getLangOpts().CPlusPlus11 && E->isGLValue() &&
      E->getType().isVolatileQualified() &&
      IsSpecialDiscardedValue(E)) {
    ExprResult Res = DefaultLvalueConversion(E);
    if (Res.isInvalid())
      return E;
    E = Res.get();
  }

  // C++1z:
  //   If the expression is a prvalue after this optional conversion, the
  //   temporary materialization conversion is applied.
  //
  // We skip this step: IR generation is able to synthesize the storage for
  // itself in the aggregate case, and adding the extra node to the AST is
  // just clutter.
  // FIXME: We don't emit lifetime markers for the temporaries due to this.
  // FIXME: Do any other AST consumers care about this?
  return E;
}

// GCC seems to also exclude expressions of incomplete enum type.
if (const EnumType *T = E->getType()->getAs<EnumType>()) {
  if (!T->getDecl()->isComplete()) {
    // FIXME: stupid workaround for a codegen bug!
    E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).get();
    return E;
  }
}

ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
if (Res.isInvalid())
  return E;
E = Res.get();

if (!E->getType()->isVoidType())
  RequireCompleteType(E->getExprLoc(), E->getType(),
                      diag::err_incomplete_type);
return E;
7119}

7121// If we can unambiguously determine whether Var can never be used
7122// in a constant expression, return true.
7123//  - if the variable and its initializer are non-dependent, then
7124//    we can unambiguously check if the variable is a constant expression.
7125//  - if the initializer is not value dependent - we can determine whether
7126//    it can be used to initialize a constant expression.  If Init can not
7127//    be used to initialize a constant expression we conclude that Var can
7128//    never be a constant expression.
7129//  - FXIME: if the initializer is dependent, we can still do some analysis and
7130//    identify certain cases unambiguously as non-const by using a Visitor:
7131//      - such as those that involve odr-use of a ParmVarDecl, involve a new
7132//        delete, lambda-expr, dynamic-cast, reinterpret-cast etc...
7133static inline bool VariableCanNeverBeAConstantExpression(VarDecl *Var,
  ASTContext &Context) {
if (isa<ParmVarDecl>(Var)) return true;
const VarDecl *DefVD = nullptr;

// If there is no initializer - this can not be a constant expression.
if (!Var->getAnyInitializer(DefVD)) return true;
assert(DefVD)(static_cast <bool> (DefVD) ? void (0) : __assert_fail (
"DefVD", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7140, __extension__ __PRETTY_FUNCTION__));
if (DefVD->isWeak()) return false;
EvaluatedStmt *Eval = DefVD->ensureEvaluatedStmt();

Expr *Init = cast<Expr>(Eval->Value);

if (Var->getType()->isDependentType() || Init->isValueDependent()) {
  // FIXME: Teach the constant evaluator to deal with the non-dependent parts
  // of value-dependent expressions, and use it here to determine whether the
  // initializer is a potential constant expression.
  return false;
}

return !IsVariableAConstantExpression(Var, Context);
7154}

7156/// \brief Check if the current lambda has any potential captures
7157/// that must be captured by any of its enclosing lambdas that are ready to
7158/// capture. If there is a lambda that can capture a nested
7159/// potential-capture, go ahead and do so.  Also, check to see if any
7160/// variables are uncaptureable or do not involve an odr-use so do not
7161/// need to be captured.

7163static void CheckIfAnyEnclosingLambdasMustCaptureAnyPotentialCaptures(
  Expr *const FE, LambdaScopeInfo *const CurrentLSI, Sema &S) {

assert(!S.isUnevaluatedContext())(static_cast <bool> (!S.isUnevaluatedContext()) ? void (
0) : __assert_fail ("!S.isUnevaluatedContext()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7166, __extension__ __PRETTY_FUNCTION__));
assert(S.CurContext->isDependentContext())(static_cast <bool> (S.CurContext->isDependentContext
()) ? void (0) : __assert_fail ("S.CurContext->isDependentContext()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7167, __extension__ __PRETTY_FUNCTION__));
7168#ifndef NDEBUG
DeclContext *DC = S.CurContext;
while (DC && isa<CapturedDecl>(DC))
  DC = DC->getParent();
assert((static_cast <bool> (CurrentLSI->CallOperator == DC &&
 "The current call operator must be synchronized with Sema's CurContext"
) ? void (0) : __assert_fail ("CurrentLSI->CallOperator == DC && \"The current call operator must be synchronized with Sema's CurContext\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7174, __extension__ __PRETTY_FUNCTION__))
    CurrentLSI->CallOperator == DC &&(static_cast <bool> (CurrentLSI->CallOperator == DC &&
 "The current call operator must be synchronized with Sema's CurContext"
) ? void (0) : __assert_fail ("CurrentLSI->CallOperator == DC && \"The current call operator must be synchronized with Sema's CurContext\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7174, __extension__ __PRETTY_FUNCTION__))
    "The current call operator must be synchronized with Sema's CurContext")(static_cast <bool> (CurrentLSI->CallOperator == DC &&
 "The current call operator must be synchronized with Sema's CurContext"
) ? void (0) : __assert_fail ("CurrentLSI->CallOperator == DC && \"The current call operator must be synchronized with Sema's CurContext\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7174, __extension__ __PRETTY_FUNCTION__));
7175#endif // NDEBUG

const bool IsFullExprInstantiationDependent = FE->isInstantiationDependent();

ArrayRef<const FunctionScopeInfo *> FunctionScopesArrayRef(
    S.FunctionScopes.data(), S.FunctionScopes.size());

// All the potentially captureable variables in the current nested
// lambda (within a generic outer lambda), must be captured by an
// outer lambda that is enclosed within a non-dependent context.
const unsigned NumPotentialCaptures =
    CurrentLSI->getNumPotentialVariableCaptures();
for (unsigned I = 0; I != NumPotentialCaptures; ++I) {
  Expr *VarExpr = nullptr;
  VarDecl *Var = nullptr;
  CurrentLSI->getPotentialVariableCapture(I, Var, VarExpr);
  // If the variable is clearly identified as non-odr-used and the full
  // expression is not instantiation dependent, only then do we not
  // need to check enclosing lambda's for speculative captures.
  // For e.g.:
  // Even though 'x' is not odr-used, it should be captured.
  // int test() {
  //   const int x = 10;
  //   auto L = [=](auto a) {
  //     (void) +x + a;
  //   };
  // }
  if (CurrentLSI->isVariableExprMarkedAsNonODRUsed(VarExpr) &&
      !IsFullExprInstantiationDependent)
    continue;

  // If we have a capture-capable lambda for the variable, go ahead and
  // capture the variable in that lambda (and all its enclosing lambdas).
  if (const Optional<unsigned> Index =
          getStackIndexOfNearestEnclosingCaptureCapableLambda(
              FunctionScopesArrayRef, Var, S)) {
    const unsigned FunctionScopeIndexOfCapturableLambda = Index.getValue();
    MarkVarDeclODRUsed(Var, VarExpr->getExprLoc(), S,
                       &FunctionScopeIndexOfCapturableLambda);
  }
  const bool IsVarNeverAConstantExpression =
      VariableCanNeverBeAConstantExpression(Var, S.Context);
  if (!IsFullExprInstantiationDependent || IsVarNeverAConstantExpression) {
    // This full expression is not instantiation dependent or the variable
    // can not be used in a constant expression - which means
    // this variable must be odr-used here, so diagnose a
    // capture violation early, if the variable is un-captureable.
    // This is purely for diagnosing errors early.  Otherwise, this
    // error would get diagnosed when the lambda becomes capture ready.
    QualType CaptureType, DeclRefType;
    SourceLocation ExprLoc = VarExpr->getExprLoc();
    if (S.tryCaptureVariable(Var, ExprLoc, S.TryCapture_Implicit,
                        /*EllipsisLoc*/ SourceLocation(),
                        /*BuildAndDiagnose*/false, CaptureType,
                        DeclRefType, nullptr)) {
      // We will never be able to capture this variable, and we need
      // to be able to in any and all instantiations, so diagnose it.
      S.tryCaptureVariable(Var, ExprLoc, S.TryCapture_Implicit,
                        /*EllipsisLoc*/ SourceLocation(),
                        /*BuildAndDiagnose*/true, CaptureType,
                        DeclRefType, nullptr);
    }
  }
}

// Check if 'this' needs to be captured.
if (CurrentLSI->hasPotentialThisCapture()) {
  // If we have a capture-capable lambda for 'this', go ahead and capture
  // 'this' in that lambda (and all its enclosing lambdas).
  if (const Optional<unsigned> Index =
          getStackIndexOfNearestEnclosingCaptureCapableLambda(
              FunctionScopesArrayRef, /*0 is 'this'*/ nullptr, S)) {
    const unsigned FunctionScopeIndexOfCapturableLambda = Index.getValue();
    S.CheckCXXThisCapture(CurrentLSI->PotentialThisCaptureLocation,
                          /*Explicit*/ false, /*BuildAndDiagnose*/ true,
                          &FunctionScopeIndexOfCapturableLambda);
  }
}

// Reset all the potential captures at the end of each full-expression.
CurrentLSI->clearPotentialCaptures();
7256}

7258static ExprResult attemptRecovery(Sema &SemaRef,
                                const TypoCorrectionConsumer &Consumer,
                                const TypoCorrection &TC) {
LookupResult R(SemaRef, Consumer.getLookupResult().getLookupNameInfo(),
               Consumer.getLookupResult().getLookupKind());
const CXXScopeSpec *SS = Consumer.getSS();
CXXScopeSpec NewSS;

// Use an approprate CXXScopeSpec for building the expr.
if (auto *NNS = TC.getCorrectionSpecifier())
  NewSS.MakeTrivial(SemaRef.Context, NNS, TC.getCorrectionRange());
else if (SS && !TC.WillReplaceSpecifier())
  NewSS = *SS;

if (auto *ND = TC.getFoundDecl()) {
  R.setLookupName(ND->getDeclName());
  R.addDecl(ND);
  if (ND->isCXXClassMember()) {
    // Figure out the correct naming class to add to the LookupResult.
    CXXRecordDecl *Record = nullptr;
    if (auto *NNS = TC.getCorrectionSpecifier())
      Record = NNS->getAsType()->getAsCXXRecordDecl();
    if (!Record)
      Record =
          dyn_cast<CXXRecordDecl>(ND->getDeclContext()->getRedeclContext());
    if (Record)
      R.setNamingClass(Record);

    // Detect and handle the case where the decl might be an implicit
    // member.
    bool MightBeImplicitMember;
    if (!Consumer.isAddressOfOperand())
      MightBeImplicitMember = true;
    else if (!NewSS.isEmpty())
      MightBeImplicitMember = false;
    else if (R.isOverloadedResult())
      MightBeImplicitMember = false;
    else if (R.isUnresolvableResult())
      MightBeImplicitMember = true;
    else
      MightBeImplicitMember = isa<FieldDecl>(ND) ||
                              isa<IndirectFieldDecl>(ND) ||
                              isa<MSPropertyDecl>(ND);

    if (MightBeImplicitMember)
      return SemaRef.BuildPossibleImplicitMemberExpr(
          NewSS, /*TemplateKWLoc*/ SourceLocation(), R,
          /*TemplateArgs*/ nullptr, /*S*/ nullptr);
  } else if (auto *Ivar = dyn_cast<ObjCIvarDecl>(ND)) {
    return SemaRef.LookupInObjCMethod(R, Consumer.getScope(),
                                      Ivar->getIdentifier());
  }
}

return SemaRef.BuildDeclarationNameExpr(NewSS, R, /*NeedsADL*/ false,
                                        /*AcceptInvalidDecl*/ true);
7314}

7316namespace {
7317class FindTypoExprs : public RecursiveASTVisitor<FindTypoExprs> {
llvm::SmallSetVector<TypoExpr *, 2> &TypoExprs;

7320public:
explicit FindTypoExprs(llvm::SmallSetVector<TypoExpr *, 2> &TypoExprs)
    : TypoExprs(TypoExprs) {}
bool VisitTypoExpr(TypoExpr *TE) {
  TypoExprs.insert(TE);
  return true;
}
7327};

7329class TransformTypos : public TreeTransform<TransformTypos> {
typedef TreeTransform<TransformTypos> BaseTransform;

VarDecl *InitDecl; // A decl to avoid as a correction because it is in the
                   // process of being initialized.
llvm::function_ref<ExprResult(Expr *)> ExprFilter;
llvm::SmallSetVector<TypoExpr *, 2> TypoExprs, AmbiguousTypoExprs;
llvm::SmallDenseMap<TypoExpr *, ExprResult, 2> TransformCache;
llvm::SmallDenseMap<OverloadExpr *, Expr *, 4> OverloadResolution;

/// \brief Emit diagnostics for all of the TypoExprs encountered.
/// If the TypoExprs were successfully corrected, then the diagnostics should
/// suggest the corrections. Otherwise the diagnostics will not suggest
/// anything (having been passed an empty TypoCorrection).
void EmitAllDiagnostics() {
  for (TypoExpr *TE : TypoExprs) {
    auto &State = SemaRef.getTypoExprState(TE);
    if (State.DiagHandler) {
      TypoCorrection TC = State.Consumer->getCurrentCorrection();
      ExprResult Replacement = TransformCache[TE];

      // Extract the NamedDecl from the transformed TypoExpr and add it to the
      // TypoCorrection, replacing the existing decls. This ensures the right
      // NamedDecl is used in diagnostics e.g. in the case where overload
      // resolution was used to select one from several possible decls that
      // had been stored in the TypoCorrection.
      if (auto *ND = getDeclFromExpr(
              Replacement.isInvalid() ? nullptr : Replacement.get()))
        TC.setCorrectionDecl(ND);

      State.DiagHandler(TC);
    }
    SemaRef.clearDelayedTypo(TE);
  }
}

/// \brief If corrections for the first TypoExpr have been exhausted for a
/// given combination of the other TypoExprs, retry those corrections against
/// the next combination of substitutions for the other TypoExprs by advancing
/// to the next potential correction of the second TypoExpr. For the second
/// and subsequent TypoExprs, if its stream of corrections has been exhausted,
/// the stream is reset and the next TypoExpr's stream is advanced by one (a
/// TypoExpr's correction stream is advanced by removing the TypoExpr from the
/// TransformCache). Returns true if there is still any untried combinations
/// of corrections.
bool CheckAndAdvanceTypoExprCorrectionStreams() {
  for (auto TE : TypoExprs) {
    auto &State = SemaRef.getTypoExprState(TE);
    TransformCache.erase(TE);
    if (!State.Consumer->finished())
      return true;
    State.Consumer->resetCorrectionStream();
  }
  return false;
}

NamedDecl *getDeclFromExpr(Expr *E) {
  if (auto *OE = dyn_cast_or_null<OverloadExpr>(E))
    E = OverloadResolution[OE];

  if (!E)
    return nullptr;
  if (auto *DRE = dyn_cast<DeclRefExpr>(E))
    return DRE->getFoundDecl();
  if (auto *ME = dyn_cast<MemberExpr>(E))
    return ME->getFoundDecl();
  // FIXME: Add any other expr types that could be be seen by the delayed typo
  // correction TreeTransform for which the corresponding TypoCorrection could
  // contain multiple decls.
  return nullptr;
}

ExprResult TryTransform(Expr *E) {
  Sema::SFINAETrap Trap(SemaRef);
  ExprResult Res = TransformExpr(E);
  if (Trap.hasErrorOccurred() || Res.isInvalid())
    return ExprError();

  return ExprFilter(Res.get());
}

7410public:
TransformTypos(Sema &SemaRef, VarDecl *InitDecl, llvm::function_ref<ExprResult(Expr *)> Filter)
    : BaseTransform(SemaRef), InitDecl(InitDecl), ExprFilter(Filter) {}

ExprResult RebuildCallExpr(Expr *Callee, SourceLocation LParenLoc,
                                 MultiExprArg Args,
                                 SourceLocation RParenLoc,
                                 Expr *ExecConfig = nullptr) {
  auto Result = BaseTransform::RebuildCallExpr(Callee, LParenLoc, Args,
                                               RParenLoc, ExecConfig);
  if (auto *OE = dyn_cast<OverloadExpr>(Callee)) {
    if (Result.isUsable()) {
      Expr *ResultCall = Result.get();
      if (auto *BE = dyn_cast<CXXBindTemporaryExpr>(ResultCall))
        ResultCall = BE->getSubExpr();
      if (auto *CE = dyn_cast<CallExpr>(ResultCall))
        OverloadResolution[OE] = CE->getCallee();
    }
  }
  return Result;
}

ExprResult TransformLambdaExpr(LambdaExpr *E) { return Owned(E); }

ExprResult TransformBlockExpr(BlockExpr *E) { return Owned(E); }

ExprResult Transform(Expr *E) {
  ExprResult Res;
  while (true) {
    Res = TryTransform(E);

    // Exit if either the transform was valid or if there were no TypoExprs
    // to transform that still have any untried correction candidates..
    if (!Res.isInvalid() ||
        !CheckAndAdvanceTypoExprCorrectionStreams())
      break;
  }

  // Ensure none of the TypoExprs have multiple typo correction candidates
  // with the same edit length that pass all the checks and filters.
  // TODO: Properly handle various permutations of possible corrections when
  // there is more than one potentially ambiguous typo correction.
  // Also, disable typo correction while attempting the transform when
  // handling potentially ambiguous typo corrections as any new TypoExprs will
  // have been introduced by the application of one of the correction
  // candidates and add little to no value if corrected.
  SemaRef.DisableTypoCorrection = true;
  while (!AmbiguousTypoExprs.empty()) {
    auto TE  = AmbiguousTypoExprs.back();
    auto Cached = TransformCache[TE];
    auto &State = SemaRef.getTypoExprState(TE);
    State.Consumer->saveCurrentPosition();
    TransformCache.erase(TE);
    if (!TryTransform(E).isInvalid()) {
      State.Consumer->resetCorrectionStream();
      TransformCache.erase(TE);
      Res = ExprError();
      break;
    }
    AmbiguousTypoExprs.remove(TE);
    State.Consumer->restoreSavedPosition();
    TransformCache[TE] = Cached;
  }
  SemaRef.DisableTypoCorrection = false;

  // Ensure that all of the TypoExprs within the current Expr have been found.
  if (!Res.isUsable())
    FindTypoExprs(TypoExprs).TraverseStmt(E);

  EmitAllDiagnostics();

  return Res;
}

ExprResult TransformTypoExpr(TypoExpr *E) {
  // If the TypoExpr hasn't been seen before, record it. Otherwise, return the
  // cached transformation result if there is one and the TypoExpr isn't the
  // first one that was encountered.
  auto &CacheEntry = TransformCache[E];
  if (!TypoExprs.insert(E) && !CacheEntry.isUnset()) {
    return CacheEntry;
  }

  auto &State = SemaRef.getTypoExprState(E);
  assert(State.Consumer && "Cannot transform a cleared TypoExpr")(static_cast <bool> (State.Consumer && "Cannot transform a cleared TypoExpr"
) ? void (0) : __assert_fail ("State.Consumer && \"Cannot transform a cleared TypoExpr\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7494, __extension__ __PRETTY_FUNCTION__));

  // For the first TypoExpr and an uncached TypoExpr, find the next likely
  // typo correction and return it.
  while (TypoCorrection TC = State.Consumer->getNextCorrection()) {
    if (InitDecl && TC.getFoundDecl() == InitDecl)
      continue;
    // FIXME: If we would typo-correct to an invalid declaration, it's
    // probably best to just suppress all errors from this typo correction.
    ExprResult NE = State.RecoveryHandler ?
        State.RecoveryHandler(SemaRef, E, TC) :
        attemptRecovery(SemaRef, *State.Consumer, TC);
    if (!NE.isInvalid()) {
      // Check whether there may be a second viable correction with the same
      // edit distance; if so, remember this TypoExpr may have an ambiguous
      // correction so it can be more thoroughly vetted later.
      TypoCorrection Next;
      if ((Next = State.Consumer->peekNextCorrection()) &&
          Next.getEditDistance(false) == TC.getEditDistance(false)) {
        AmbiguousTypoExprs.insert(E);
      } else {
        AmbiguousTypoExprs.remove(E);
      }
      assert(!NE.isUnset() &&(static_cast <bool> (!NE.isUnset() && "Typo was transformed into a valid-but-null ExprResult"
) ? void (0) : __assert_fail ("!NE.isUnset() && \"Typo was transformed into a valid-but-null ExprResult\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7518, __extension__ __PRETTY_FUNCTION__))
             "Typo was transformed into a valid-but-null ExprResult")(static_cast <bool> (!NE.isUnset() && "Typo was transformed into a valid-but-null ExprResult"
) ? void (0) : __assert_fail ("!NE.isUnset() && \"Typo was transformed into a valid-but-null ExprResult\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7518, __extension__ __PRETTY_FUNCTION__));
      return CacheEntry = NE;
    }
  }
  return CacheEntry = ExprError();
}
7524};
7525}

7527ExprResult
7528Sema::CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl,
                              llvm::function_ref<ExprResult(Expr *)> Filter) {
// If the current evaluation context indicates there are uncorrected typos
// and the current expression isn't guaranteed to not have typos, try to
// resolve any TypoExpr nodes that might be in the expression.
if (E && !ExprEvalContexts.empty() && ExprEvalContexts.back().NumTypos &&
    (E->isTypeDependent() || E->isValueDependent() ||
     E->isInstantiationDependent())) {
  auto TyposInContext = ExprEvalContexts.back().NumTypos;
  assert(TyposInContext < ~0U && "Recursive call of CorrectDelayedTyposInExpr")(static_cast <bool> (TyposInContext < ~0U &&
 "Recursive call of CorrectDelayedTyposInExpr") ? void (0) : __assert_fail
 ("TyposInContext < ~0U && \"Recursive call of CorrectDelayedTyposInExpr\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7537, __extension__ __PRETTY_FUNCTION__));
  ExprEvalContexts.back().NumTypos = ~0U;
  auto TyposResolved = DelayedTypos.size();
  auto Result = TransformTypos(*this, InitDecl, Filter).Transform(E);
  ExprEvalContexts.back().NumTypos = TyposInContext;
  TyposResolved -= DelayedTypos.size();
  if (Result.isInvalid() || Result.get() != E) {
    ExprEvalContexts.back().NumTypos -= TyposResolved;
    return Result;
  }
  assert(TyposResolved == 0 && "Corrected typo but got same Expr back?")(static_cast <bool> (TyposResolved == 0 && "Corrected typo but got same Expr back?"
) ? void (0) : __assert_fail ("TyposResolved == 0 && \"Corrected typo but got same Expr back?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7547, __extension__ __PRETTY_FUNCTION__));
}
return E;
7550}

7552ExprResult Sema::ActOnFinishFullExpr(Expr *FE, SourceLocation CC,
                                   bool DiscardedValue,
                                   bool IsConstexpr,
                                   bool IsLambdaInitCaptureInitializer) {
ExprResult FullExpr = FE;

if (!FullExpr.get())
  return ExprError();

// If we are an init-expression in a lambdas init-capture, we should not
// diagnose an unexpanded pack now (will be diagnosed once lambda-expr
// containing full-expression is done).
// template<class ... Ts> void test(Ts ... t) {
//   test([&a(t)]() { <-- (t) is an init-expr that shouldn't be diagnosed now.
//     return a;
//   }() ...);
// }
// FIXME: This is a hack. It would be better if we pushed the lambda scope
// when we parse the lambda introducer, and teach capturing (but not
// unexpanded pack detection) to walk over LambdaScopeInfos which don't have a
// corresponding class yet (that is, have LambdaScopeInfo either represent a
// lambda where we've entered the introducer but not the body, or represent a
// lambda where we've entered the body, depending on where the
// parser/instantiation has got to).
if (!IsLambdaInitCaptureInitializer &&
    DiagnoseUnexpandedParameterPack(FullExpr.get()))
  return ExprError();

// Top-level expressions default to 'id' when we're in a debugger.
if (DiscardedValue && getLangOpts().DebuggerCastResultToId &&
    FullExpr.get()->getType() == Context.UnknownAnyTy) {
  FullExpr = forceUnknownAnyToType(FullExpr.get(), Context.getObjCIdType());
  if (FullExpr.isInvalid())
    return ExprError();
}

if (DiscardedValue) {
  FullExpr = CheckPlaceholderExpr(FullExpr.get());
  if (FullExpr.isInvalid())
    return ExprError();

  FullExpr = IgnoredValueConversions(FullExpr.get());
  if (FullExpr.isInvalid())
    return ExprError();
}

FullExpr = CorrectDelayedTyposInExpr(FullExpr.get());
if (FullExpr.isInvalid())
  return ExprError();

CheckCompletedExpr(FullExpr.get(), CC, IsConstexpr);

// At the end of this full expression (which could be a deeply nested
// lambda), if there is a potential capture within the nested lambda,
// have the outer capture-able lambda try and capture it.
// Consider the following code:
// void f(int, int);
// void f(const int&, double);
// void foo() {
//  const int x = 10, y = 20;
//  auto L = [=](auto a) {
//      auto M = [=](auto b) {
//         f(x, b); <-- requires x to be captured by L and M
//         f(y, a); <-- requires y to be captured by L, but not all Ms
//      };
//   };
// }

// FIXME: Also consider what happens for something like this that involves
// the gnu-extension statement-expressions or even lambda-init-captures:
//   void f() {
//     const int n = 0;
//     auto L =  [&](auto a) {
//       +n + ({ 0; a; });
//     };
//   }
//
// Here, we see +n, and then the full-expression 0; ends, so we don't
// capture n (and instead remove it from our list of potential captures),
// and then the full-expression +n + ({ 0; }); ends, but it's too late
// for us to see that we need to capture n after all.

LambdaScopeInfo *const CurrentLSI =
    getCurLambda(/*IgnoreCapturedRegions=*/true);
// FIXME: PR 17877 showed that getCurLambda() can return a valid pointer
// even if CurContext is not a lambda call operator. Refer to that Bug Report
// for an example of the code that might cause this asynchrony.
// By ensuring we are in the context of a lambda's call operator
// we can fix the bug (we only need to check whether we need to capture
// if we are within a lambda's body); but per the comments in that
// PR, a proper fix would entail :
//   "Alternative suggestion:
//   - Add to Sema an integer holding the smallest (outermost) scope
//     index that we are *lexically* within, and save/restore/set to
//     FunctionScopes.size() in InstantiatingTemplate's
//     constructor/destructor.
//  - Teach the handful of places that iterate over FunctionScopes to
//    stop at the outermost enclosing lexical scope."
DeclContext *DC = CurContext;
while (DC && isa<CapturedDecl>(DC))
  DC = DC->getParent();
const bool IsInLambdaDeclContext = isLambdaCallOperator(DC);
if (IsInLambdaDeclContext && CurrentLSI &&
    CurrentLSI->hasPotentialCaptures() && !FullExpr.isInvalid())
  CheckIfAnyEnclosingLambdasMustCaptureAnyPotentialCaptures(FE, CurrentLSI,
                                                            *this);
return MaybeCreateExprWithCleanups(FullExpr);
7659}

7661StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) {
if (!FullStmt) return StmtError();

return MaybeCreateStmtWithCleanups(FullStmt);
7665}

7667Sema::IfExistsResult
7668Sema::CheckMicrosoftIfExistsSymbol(Scope *S,
                                 CXXScopeSpec &SS,
                                 const DeclarationNameInfo &TargetNameInfo) {
DeclarationName TargetName = TargetNameInfo.getName();
if (!TargetName)
  return IER_DoesNotExist;

// If the name itself is dependent, then the result is dependent.
if (TargetName.isDependentName())
  return IER_Dependent;

// Do the redeclaration lookup in the current scope.
LookupResult R(*this, TargetNameInfo, Sema::LookupAnyName,
               Sema::NotForRedeclaration);
LookupParsedName(R, S, &SS);
R.suppressDiagnostics();

switch (R.getResultKind()) {
case LookupResult::Found:
case LookupResult::FoundOverloaded:
case LookupResult::FoundUnresolvedValue:
case LookupResult::Ambiguous:
  return IER_Exists;

case LookupResult::NotFound:
  return IER_DoesNotExist;

case LookupResult::NotFoundInCurrentInstantiation:
  return IER_Dependent;
}

llvm_unreachable("Invalid LookupResult Kind!")::llvm::llvm_unreachable_internal("Invalid LookupResult Kind!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaExprCXX.cpp"
, 7699);
7700}

7702Sema::IfExistsResult
7703Sema::CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
                                 bool IsIfExists, CXXScopeSpec &SS,
                                 UnqualifiedId &Name) {
DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name);

// Check for an unexpanded parameter pack.
auto UPPC = IsIfExists ? UPPC_IfExists : UPPC_IfNotExists;
if (DiagnoseUnexpandedParameterPack(SS, UPPC) ||
    DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC))
  return IER_Error;

return CheckMicrosoftIfExistsSymbol(S, SS, TargetNameInfo);
7715}

←

/build/llvm-toolchain-snapshot-7~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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())
8
←
Assuming the condition is false→
9
←
Taking false branch→
      *Diag.ImmediateDiag << Value;
    else if (Diag.PartialDiag.hasValue())
10
←
Assuming the condition is true→
11
←
Taking true branch→
      *Diag.PartialDiag << Value;
12
←
Calling 'operator<<'→
23
←
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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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)
17
←
Taking false branch→
    return DiagStorage;

  if (Allocator)
18
←
Assuming the condition is false→
19
←
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~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 140, __extension__ __PRETTY_FUNCTION__));
    DiagStorage = new Storage;
20
←
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)
14
←
Assuming the condition is true→
15
←
Taking true branch→
    DiagStorage = getStorage();
16
←
Calling 'PartialDiagnostic::getStorage'→
21
←
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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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~svn326551/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),
13
←
Calling 'PartialDiagnostic::AddTaggedVal'→
22
←
Returned allocated memory→
                  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