/usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaExprCXX.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaExprCXX.cpp
Warning:	line 620, column 7 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaExprCXX.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include/clang/Sema -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangSema/../include -I /usr/src/gnu/usr.bin/clang/libclangSema/obj -I /usr/src/gnu/usr.bin/clang/libclangSema/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangSema/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaExprCXX.cpp
1//===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// Implements semantic analysis for C++ expressions.
11///
12//===----------------------------------------------------------------------===//

14#include "clang/Sema/Template.h"
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/// 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")((void)0);
  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")__builtin_unreachable();
}

// 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::getConstructorName(IdentifierInfo &II,
                                  SourceLocation NameLoc,
                                  Scope *S, CXXScopeSpec &SS,
                                  bool EnteringContext) {
CXXRecordDecl *CurClass = getCurrentClass(S, &SS);
assert(CurClass && &II == CurClass->getIdentifier() &&((void)0)
       "not a constructor name")((void)0);

// When naming a constructor as a member of a dependent context (eg, in a
// friend declaration or an inherited constructor declaration), form an
// unresolved "typename" type.
if (CurClass->isDependentContext() && !EnteringContext && SS.getScopeRep()) {
  QualType T = Context.getDependentNameType(ETK_None, SS.getScopeRep(), &II);
  return ParsedType::make(T);
}

if (SS.isNotEmpty() && RequireCompleteDeclContext(SS, CurClass))
  return ParsedType();

// Find the injected-class-name declaration. Note that we make no attempt to
// diagnose cases where the injected-class-name is shadowed: the only
// declaration that can validly shadow the injected-class-name is a
// non-static data member, and if the class contains both a non-static data
// member and a constructor then it is ill-formed (we check that in
// CheckCompletedCXXClass).
CXXRecordDecl *InjectedClassName = nullptr;
for (NamedDecl *ND : CurClass->lookup(&II)) {
  auto *RD = dyn_cast<CXXRecordDecl>(ND);
  if (RD && RD->isInjectedClassName()) {
    InjectedClassName = RD;
    break;
  }
}
if (!InjectedClassName) {
  if (!CurClass->isInvalidDecl()) {
    // FIXME: RequireCompleteDeclContext doesn't check dependent contexts
    // properly. Work around it here for now.
    Diag(SS.getLastQualifierNameLoc(),
         diag::err_incomplete_nested_name_spec) << CurClass << SS.getRange();
  }
  return ParsedType();
}

QualType T = Context.getTypeDeclType(InjectedClassName);
DiagnoseUseOfDecl(InjectedClassName, NameLoc);
MarkAnyDeclReferenced(NameLoc, InjectedClassName, /*OdrUse=*/false);

return ParsedType::make(T);
131}

133ParsedType 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 now, we accept all the cases in which the name given could plausibly
// be interpreted as a correct destructor name, issuing off-by-default
// extension diagnostics on the cases that don't strictly conform to the
// C++20 rules. This basically means we always consider looking in the
// nested-name-specifier prefix, the complete nested-name-specifier, and
// the scope, and accept if we find the expected type in any of the three
// places.

if (SS.isInvalid())
  return nullptr;

// Whether we've failed with a diagnostic already.
bool Failed = false;

llvm::SmallVector<NamedDecl*, 8> FoundDecls;
llvm::SmallPtrSet<CanonicalDeclPtr<Decl>, 8> FoundDeclSet;

// 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.
QualType SearchType =
    ObjectTypePtr ? GetTypeFromParser(ObjectTypePtr) : QualType();

auto CheckLookupResult = [&](LookupResult &Found) -> ParsedType {
  auto IsAcceptableResult = [&](NamedDecl *D) -> bool {
    auto *Type = dyn_cast<TypeDecl>(D->getUnderlyingDecl());
    if (!Type)
      return false;

    if (SearchType.isNull() || SearchType->isDependentType())
      return true;

    QualType T = Context.getTypeDeclType(Type);
    return Context.hasSameUnqualifiedType(T, SearchType);
  };

  unsigned NumAcceptableResults = 0;
  for (NamedDecl *D : Found) {
    if (IsAcceptableResult(D))
      ++NumAcceptableResults;

    // Don't list a class twice in the lookup failure diagnostic if it's
    // found by both its injected-class-name and by the name in the enclosing
    // scope.
    if (auto *RD = dyn_cast<CXXRecordDecl>(D))
      if (RD->isInjectedClassName())
        D = cast<NamedDecl>(RD->getParent());

    if (FoundDeclSet.insert(D).second)
      FoundDecls.push_back(D);
  }

  // As an extension, attempt to "fix" an ambiguity by erasing all non-type
  // results, and all non-matching results if we have a search type. It's not
  // clear what the right behavior is if destructor lookup hits an ambiguity,
  // but other compilers do generally accept at least some kinds of
  // ambiguity.
  if (Found.isAmbiguous() && NumAcceptableResults == 1) {
    Diag(NameLoc, diag::ext_dtor_name_ambiguous);
    LookupResult::Filter F = Found.makeFilter();
    while (F.hasNext()) {
      NamedDecl *D = F.next();
      if (auto *TD = dyn_cast<TypeDecl>(D->getUnderlyingDecl()))
        Diag(D->getLocation(), diag::note_destructor_type_here)
            << Context.getTypeDeclType(TD);
      else
        Diag(D->getLocation(), diag::note_destructor_nontype_here);

      if (!IsAcceptableResult(D))
        F.erase();
    }
    F.done();
  }

  if (Found.isAmbiguous())
    Failed = true;

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

  return nullptr;
};

bool IsDependent = false;

auto LookupInObjectType = [&]() -> ParsedType {
  if (Failed || SearchType.isNull())
    return nullptr;

  IsDependent |= SearchType->isDependentType();

  LookupResult Found(*this, &II, NameLoc, LookupDestructorName);
  DeclContext *LookupCtx = computeDeclContext(SearchType);
  if (!LookupCtx)
    return nullptr;
  LookupQualifiedName(Found, LookupCtx);
  return CheckLookupResult(Found);
};

auto LookupInNestedNameSpec = [&](CXXScopeSpec &LookupSS) -> ParsedType {
  if (Failed)
    return nullptr;

  IsDependent |= isDependentScopeSpecifier(LookupSS);
  DeclContext *LookupCtx = computeDeclContext(LookupSS, EnteringContext);
  if (!LookupCtx)
    return nullptr;

  LookupResult Found(*this, &II, NameLoc, LookupDestructorName);
  if (RequireCompleteDeclContext(LookupSS, LookupCtx)) {
    Failed = true;
    return nullptr;
  }
  LookupQualifiedName(Found, LookupCtx);
  return CheckLookupResult(Found);
};

auto LookupInScope = [&]() -> ParsedType {
  if (Failed || !S)
    return nullptr;

  LookupResult Found(*this, &II, NameLoc, LookupDestructorName);
  LookupName(Found, S);
  return CheckLookupResult(Found);
};

// C++2a [basic.lookup.qual]p6:
//   In a qualified-id of the form
//
//     nested-name-specifier[opt] type-name :: ~ type-name
//
//   the second type-name is looked up in the same scope as the first.
//
// We interpret this as meaning that if you do a dual-scope lookup for the
// first name, you also do a dual-scope lookup for the second name, per
// C++ [basic.lookup.classref]p4:
//
//   If the id-expression in a class member access is a qualified-id of the
//   form
//
//     class-name-or-namespace-name :: ...
//
//   the class-name-or-namespace-name following the . or -> is first looked
//   up in the class of the object expression and the name, if found, is used.
//   Otherwise, it is looked up in the context of the entire
//   postfix-expression.
//
// This looks in the same scopes as for an unqualified destructor name:
//
// 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 cv T.
//
// FIXME: The intent is unclear here. Should type-name::~type-name look in
// the scope anyway if it finds a non-matching name declared in the class?
// If both lookups succeed and find a dependent result, which result should
// we retain? (Same question for p->~type-name().)

if (NestedNameSpecifier *Prefix =
    SS.isSet() ? SS.getScopeRep()->getPrefix() : nullptr) {
  // This is
  //
  //   nested-name-specifier type-name :: ~ type-name
  //
  // Look for the second type-name in the nested-name-specifier.
  CXXScopeSpec PrefixSS;
  PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
  if (ParsedType T = LookupInNestedNameSpec(PrefixSS))
    return T;
} else {
  // This is one of
  //
  //   type-name :: ~ type-name
  //   ~ type-name
  //
  // Look in the scope and (if any) the object type.
  if (ParsedType T = LookupInScope())
    return T;
  if (ParsedType T = LookupInObjectType())
    return T;
}

if (Failed)
  return nullptr;

if (IsDependent) {
  // We didn't find our type, but that's OK: 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);
}

// The remaining cases are all non-standard extensions imitating the behavior
// of various other compilers.
unsigned NumNonExtensionDecls = FoundDecls.size();

if (SS.isSet()) {
  // For compatibility with older broken C++ rules and existing code,
  //
  //   nested-name-specifier :: ~ type-name
  //
  // also looks for type-name within the nested-name-specifier.
  if (ParsedType T = LookupInNestedNameSpec(SS)) {
    Diag(SS.getEndLoc(), diag::ext_dtor_named_in_wrong_scope)
        << SS.getRange()
        << FixItHint::CreateInsertion(SS.getEndLoc(),
                                      ("::" + II.getName()).str());
    return T;
  }

  // For compatibility with other compilers and older versions of Clang,
  //
  //   nested-name-specifier type-name :: ~ type-name
  //
  // also looks for type-name in the scope. Unfortunately, we can't
  // reasonably apply this fallback for dependent nested-name-specifiers.
  if (SS.getScopeRep()->getPrefix()) {
    if (ParsedType T = LookupInScope()) {
      Diag(SS.getEndLoc(), diag::ext_qualified_dtor_named_in_lexical_scope)
          << FixItHint::CreateRemoval(SS.getRange());
      Diag(FoundDecls.back()->getLocation(), diag::note_destructor_type_here)
          << GetTypeFromParser(T);
      return T;
    }
  }
}

// We didn't find anything matching; tell the user what we did find (if
// anything).

// Don't tell the user about declarations we shouldn't have found.
FoundDecls.resize(NumNonExtensionDecls);

// List types before non-types.
std::stable_sort(FoundDecls.begin(), FoundDecls.end(),
                 [](NamedDecl *A, NamedDecl *B) {
                   return isa<TypeDecl>(A->getUnderlyingDecl()) >
                          isa<TypeDecl>(B->getUnderlyingDecl());
                 });

// Suggest a fixit to properly name the destroyed type.
auto MakeFixItHint = [&]{
  const CXXRecordDecl *Destroyed = nullptr;
  // FIXME: If we have a scope specifier, suggest its last component?
  if (!SearchType.isNull())
    Destroyed = SearchType->getAsCXXRecordDecl();
  else if (S)
    Destroyed = dyn_cast_or_null<CXXRecordDecl>(S->getEntity());
  if (Destroyed)
    return FixItHint::CreateReplacement(SourceRange(NameLoc),
                                        Destroyed->getNameAsString());
  return FixItHint();
};

if (FoundDecls.empty()) {
  // FIXME: Attempt typo-correction?
  Diag(NameLoc, diag::err_undeclared_destructor_name)
    << &II << MakeFixItHint();
} else if (!SearchType.isNull() && FoundDecls.size() == 1) {
  if (auto *TD = dyn_cast<TypeDecl>(FoundDecls[0]->getUnderlyingDecl())) {
    assert(!SearchType.isNull() &&((void)0)
           "should only reject a type result if we have a search type")((void)0);
    QualType T = Context.getTypeDeclType(TD);
    Diag(NameLoc, diag::err_destructor_expr_type_mismatch)
        << T << SearchType << MakeFixItHint();
  } else {
    Diag(NameLoc, diag::err_destructor_expr_nontype)
        << &II << MakeFixItHint();
  }
} else {
  Diag(NameLoc, SearchType.isNull() ? diag::err_destructor_name_nontype
                                    : diag::err_destructor_expr_mismatch)
      << &II << SearchType << MakeFixItHint();
}

for (NamedDecl *FoundD : FoundDecls) {
  if (auto *TD = dyn_cast<TypeDecl>(FoundD->getUnderlyingDecl()))
    Diag(FoundD->getLocation(), diag::note_destructor_type_here)
        << Context.getTypeDeclType(TD);
  else
    Diag(FoundD->getLocation(), diag::note_destructor_nontype_here)
        << FoundD;
}

return nullptr;
457}

459ParsedType 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 &&((void)0)
       "unexpected type in getDestructorType")((void)0);
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);
484}

486bool Sema::checkLiteralOperatorId(const CXXScopeSpec &SS,
                                const UnqualifiedId &Name, bool IsUDSuffix) {
assert(Name.getKind() == UnqualifiedIdKind::IK_LiteralOperatorId)((void)0);
if (!IsUDSuffix) {
  // [over.literal] p8
  //
  // double operator""_Bq(long double);  // OK: not a reserved identifier
  // double operator"" _Bq(long double); // ill-formed, no diagnostic required
  IdentifierInfo *II = Name.Identifier;
  ReservedIdentifierStatus Status = II->isReserved(PP.getLangOpts());
  SourceLocation Loc = Name.getEndLoc();
  if (Status != ReservedIdentifierStatus::NotReserved &&
      !PP.getSourceManager().isInSystemHeader(Loc)) {
    Diag(Loc, diag::warn_reserved_extern_symbol)
        << II << static_cast<int>(Status)
        << FixItHint::CreateReplacement(
               Name.getSourceRange(),
               (StringRef("operator\"\"") + II->getName()).str());
  }
}

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.getBeginLoc(), 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")__builtin_unreachable();
530}

532/// Build a C++ typeid expression with a type operand.
533ExprResult 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);

if (CheckQualifiedFunctionForTypeId(T, TypeidLoc))
  return ExprError();

return new (Context) CXXTypeidExpr(TypeInfoType.withConst(), Operand,
                                   SourceRange(TypeidLoc, RParenLoc));
558}

560/// Build a C++ typeid expression with an expression operand.
561ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType,
                              SourceLocation TypeidLoc,
                              Expr *E,
                              SourceLocation RParenLoc) {
bool WasEvaluated = false;
if (E && !E->isTypeDependent()) {
13
←
Assuming 'E' is null→
  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()) {
      if (isUnevaluatedContext()) {
        // The operand was processed in unevaluated context, 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;
    }
  }

  ExprResult Result = CheckUnevaluatedOperand(E);
  if (Result.isInvalid())
    return ExprError();
  E = Result.get();

  // 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())
14
←
Called C++ object pointer is null
  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));
634}

636/// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression);
637ExprResult
638Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
                   bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
// typeid is not supported in OpenCL.
if (getLangOpts().OpenCLCPlusPlus) {
1
Assuming field 'OpenCLCPlusPlus' is 0→
2
←
Taking false branch→
  return ExprError(Diag(OpLoc, diag::err_openclcxx_not_supported)
                   << "typeid");
}

// Find the std::type_info type.
if (!getStdNamespace())
3
←
Assuming the condition is false→
4
←
Taking false branch→
  return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));

if (!CXXTypeInfoDecl) {
5
←
Assuming field 'CXXTypeInfoDecl' is non-null→
6
←
Taking false branch→
  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) {
7
←
Assuming field 'RTTI' is not equal to 0→
8
←
Taking false branch→
  return ExprError(Diag(OpLoc, diag::err_no_typeid_with_fno_rtti));
}

QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl);

if (isType) {
9
←
Assuming 'isType' is false→
10
←
Taking false branch→
  // 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.
ExprResult Result =
    BuildCXXTypeId(TypeInfoType, OpLoc, (Expr *)TyOrExpr, RParenLoc);
11
←
Passing value via 3rd parameter 'E'→
12
←
Calling 'Sema::BuildCXXTypeId'→

if (!getLangOpts().RTTIData && !Result.isInvalid())
  if (auto *CTE = dyn_cast<CXXTypeidExpr>(Result.get()))
    if (CTE->isPotentiallyEvaluated() && !CTE->isMostDerived(Context))
      Diag(OpLoc, diag::warn_no_typeid_with_rtti_disabled)
          << (getDiagnostics().getDiagnosticOptions().getFormat() ==
              DiagnosticOptions::MSVC);
return Result;
696}

698/// Grabs __declspec(uuid()) off a type, or returns 0 if we cannot resolve to
699/// a single GUID.
700static void
701getUuidAttrOfType(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);
  }
}
733}

735/// Build a Microsoft __uuidof expression with a type operand.
736ExprResult Sema::BuildCXXUuidof(QualType Type,
                              SourceLocation TypeidLoc,
                              TypeSourceInfo *Operand,
                              SourceLocation RParenLoc) {
MSGuidDecl *Guid = nullptr;
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));
  Guid = UuidAttrs.back()->getGuidDecl();
}

return new (Context)
    CXXUuidofExpr(Type, Operand, Guid, SourceRange(TypeidLoc, RParenLoc));
753}

755/// Build a Microsoft __uuidof expression with an expression operand.
756ExprResult Sema::BuildCXXUuidof(QualType Type, SourceLocation TypeidLoc,
                              Expr *E, SourceLocation RParenLoc) {
MSGuidDecl *Guid = nullptr;
if (!E->getType()->isDependentType()) {
  if (E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
    // A null pointer results in {00000000-0000-0000-0000-000000000000}.
    Guid = Context.getMSGuidDecl(MSGuidDecl::Parts{});
  } 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));
    Guid = UuidAttrs.back()->getGuidDecl();
  }
}

return new (Context)
    CXXUuidofExpr(Type, E, Guid, SourceRange(TypeidLoc, RParenLoc));
776}

778/// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression);
779ExprResult
780Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc,
                   bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
QualType GuidType = Context.getMSGuidType();
GuidType.addConst();

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);
801}

803/// ActOnCXXBoolLiteral - Parse {true,false} literals.
804ExprResult
805Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
assert((Kind == tok::kw_true || Kind == tok::kw_false) &&((void)0)
       "Unknown C++ Boolean value!")((void)0);
return new (Context)
    CXXBoolLiteralExpr(Kind == tok::kw_true, Context.BoolTy, OpLoc);
810}

812/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
813ExprResult
814Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
return new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc);
816}

818/// ActOnCXXThrow - Parse throw expressions.
819ExprResult
820Sema::ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *Ex) {
bool IsThrownVarInScope = false;
if (Ex) {
  // 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);
854}

856ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
                             bool IsThrownVarInScope) {
// Don't report an error if 'throw' is used in system headers.
if (!getLangOpts().CXXExceptions &&
    !getSourceManager().isInSystemHeader(OpLoc) && !getLangOpts().CUDA) {
  // Delay error emission for the OpenMP device code.
  targetDiag(OpLoc, diag::err_exceptions_disabled) << "throw";
}

// Exceptions aren't allowed in CUDA device code.
if (getLangOpts().CUDA)
  CUDADiagIfDeviceCode(OpLoc, diag::err_cuda_device_exceptions)
      << "throw" << CurrentCUDATarget();

if (getCurScope() && getCurScope()->isOpenMPSimdDirectiveScope())
  Diag(OpLoc, diag::err_omp_simd_region_cannot_use_stmt) << "throw";

if (Ex && !Ex->isTypeDependent()) {
  // 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
  NamedReturnInfo NRInfo =
      IsThrownVarInScope ? getNamedReturnInfo(Ex) : NamedReturnInfo();

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

  InitializedEntity Entity =
      InitializedEntity::InitializeException(OpLoc, ExceptionObjectTy);
  ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRInfo, Ex);
  if (Res.isInvalid())
    return ExprError();
  Ex = Res.get();
}

// PPC MMA non-pointer types are not allowed as throw expr types.
if (Ex && Context.getTargetInfo().getTriple().isPPC64())
  CheckPPCMMAType(Ex->getType(), Ex->getBeginLoc());

return new (Context)
    CXXThrowExpr(Ex, Context.VoidTy, OpLoc, IsThrownVarInScope);
910}

912static void
913collectPublicBases(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);
}
940}

942static 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);
}
959}

961/// CheckCXXThrowOperand - Validate the operand of a throw.
962bool 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 (!isPointer && Ty->isSizelessType()) {
    Diag(ThrowLoc, diag::err_throw_sizeless) << Ty << 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 || CD->isDeleted())
      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;
    }
  }
}

// Under the Itanium C++ ABI, memory for the exception object is allocated by
// the runtime with no ability for the compiler to request additional
// alignment. Warn if the exception type requires alignment beyond the minimum
// guaranteed by the target C++ runtime.
if (Context.getTargetInfo().getCXXABI().isItaniumFamily()) {
  CharUnits TypeAlign = Context.getTypeAlignInChars(Ty);
  CharUnits ExnObjAlign = Context.getExnObjectAlignment();
  if (ExnObjAlign < TypeAlign) {
    Diag(ThrowLoc, diag::warn_throw_underaligned_obj);
    Diag(ThrowLoc, diag::note_throw_underaligned_obj)
        << Ty << (unsigned)TypeAlign.getQuantity()
        << (unsigned)ExnObjAlign.getQuantity();
  }
}

return false;
1073}

1075static 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 "((void)0)
                   "lambda, we must have a corresponding LambdaScopeInfo")((void)0);
  assert(isGenericLambdaCallOperatorSpecialization(CurLSI->CallOperator) &&((void)0)
         "While computing 'this' capture-type for a generic lambda, when we "((void)0)
         "run out of enclosing LSI's, yet the enclosing DC is a "((void)0)
         "lambda-call-operator we must be (i.e. Current LSI) in a generic "((void)0)
         "lambda call oeprator")((void)0);
  assert(CurDC == getLambdaAwareParentOfDeclContext(CurLSI->CallOperator))((void)0);

  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);
1184}

1186QualType Sema::getCurrentThisType() {
DeclContext *DC = getFunctionLevelDeclContext();
QualType ThisTy = CXXThisTypeOverride;

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

if (ThisTy.isNull() && isLambdaCallOperator(CurContext) &&
    inTemplateInstantiation() && isa<CXXRecordDecl>(DC)) {

  // 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;
1214}

1216Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
                                       Decl *ContextDecl,
                                       Qualifiers CXXThisTypeQuals,
                                       bool Enabled)
: S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
1221{
if (!Enabled || !ContextDecl)
  return;

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

QualType T = S.Context.getRecordType(Record);
T = S.getASTContext().getQualifiedType(T, CXXThisTypeQuals);

S.CXXThisTypeOverride = S.Context.getPointerType(T);

this->Enabled = true;
1237}


1240Sema::CXXThisScopeRAII::~CXXThisScopeRAII() {
if (Enabled) {
  S.CXXThisTypeOverride = OldCXXThisTypeOverride;
}
1244}

1246static void buildLambdaThisCaptureFixit(Sema &Sema, LambdaScopeInfo *LSI) {
SourceLocation DiagLoc = LSI->IntroducerRange.getEnd();
assert(!LSI->isCXXThisCaptured())((void)0);
//  [=, this] {};   // until C++20: Error: this when = is the default
if (LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_LambdaByval &&
    !Sema.getLangOpts().CPlusPlus20)
  return;
Sema.Diag(DiagLoc, diag::note_lambda_this_capture_fixit)
    << FixItHint::CreateInsertion(
           DiagLoc, LSI->NumExplicitCaptures > 0 ? ", this" : "this");
1256}

1258bool 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")((void)0);

const int 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 (int 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);
        if (!Explicit)
          buildLambdaThisCaptureFixit(*this, LSI);
      }
      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);

    if (!Explicit)
      buildLambdaThisCaptureFixit(*this, LSI);
    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 ||((void)0)
        dyn_cast<LambdaScopeInfo>(FunctionScopes[MaxFunctionScopesIndex])) &&((void)0)
       "Only a lambda can capture the enclosing object (referred to by "((void)0)
       "*this) by copy")((void)0);
QualType ThisTy = getCurrentThisType();
for (int idx = MaxFunctionScopesIndex; NumCapturingClosures;
     --idx, --NumCapturingClosures) {
  CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[idx]);

  // The type of the corresponding data member (not a 'this' pointer if 'by
  // copy').
  QualType CaptureType = 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'.
    CaptureType = ThisTy->getPointeeType();
    CaptureType.removeLocalCVRQualifiers(Qualifiers::CVRMask);
  }

  bool isNested = NumCapturingClosures > 1;
  CSI->addThisCapture(isNested, Loc, CaptureType, ByCopy);
}
return false;
1374}

1376ExprResult 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);
return BuildCXXThisExpr(Loc, ThisTy, /*IsImplicit=*/false);
1385}

1387Expr *Sema::BuildCXXThisExpr(SourceLocation Loc, QualType Type,
                           bool IsImplicit) {
auto *This = new (Context) CXXThisExpr(Loc, Type, IsImplicit);
MarkThisReferenced(This);
return This;
1392}

1394void Sema::MarkThisReferenced(CXXThisExpr *This) {
CheckCXXThisCapture(This->getExprLoc());
1396}

1398bool 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();
1408}

1410/// Parse construction of a specified type.
1411/// Can be interpreted either as function-style casting ("int(x)")
1412/// or class type construction ("ClassType(x,y,z)")
1413/// or creation of a value-initialized type ("int()").
1414ExprResult
1415Sema::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());
else if (Result.isInvalid())
  Result = CreateRecoveryExpr(TInfo->getTypeLoc().getBeginLoc(),
                              RParenOrBraceLoc, exprs, Ty);
return Result;
1440}

1442ExprResult
1443Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
                              SourceLocation LParenOrBraceLoc,
                              MultiExprArg Exprs,
                              SourceLocation RParenOrBraceLoc,
                              bool ListInitialization) {
QualType Ty = TInfo->getType();
SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();

assert((!ListInitialization ||((void)0)
        (Exprs.size() == 1 && isa<InitListExpr>(Exprs[0]))) &&((void)0)
       "List initialization must have initializer list as expression.")((void)0);
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);
}

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, Ty.getNonReferenceType(),
                                            TInfo, Locs.getBegin(), Exprs,
                                            Locs.getEnd());
}

// 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, CurFPFeatureOverrides(),
      Locs.getBegin(), Locs.getEnd());
}

return Result;
1556}

1558bool Sema::isUsualDeallocationFunction(const CXXMethodDecl *Method) {
// [CUDA] Ignore this function, if we can't call it.
const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext);
if (getLangOpts().CUDA) {
  auto CallPreference = IdentifyCUDAPreference(Caller, Method);
  // If it's not callable at all, it's not the right function.
  if (CallPreference < CFP_WrongSide)
    return false;
  if (CallPreference == CFP_WrongSide) {
    // Maybe. We have to check if there are better alternatives.
    DeclContext::lookup_result R =
        Method->getDeclContext()->lookup(Method->getDeclName());
    for (const auto *D : R) {
      if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
        if (IdentifyCUDAPreference(Caller, FD) > CFP_WrongSide)
          return false;
      }
    }
    // We've found no better variants.
  }
}

SmallVector<const FunctionDecl*, 4> PreventedBy;
bool Result = Method->isUsualDeallocationFunction(PreventedBy);

if (Result || !getLangOpts().CUDA || PreventedBy.empty())
  return Result;

// In case of CUDA, return true if none of the 1-argument deallocator
// functions are actually callable.
return llvm::none_of(PreventedBy, [&](const FunctionDecl *FD) {
  assert(FD->getNumParams() == 1 &&((void)0)
         "Only single-operand functions should be in PreventedBy")((void)0);
  return IdentifyCUDAPreference(Caller, FD) >= CFP_HostDevice;
});
1593}

1595/// Determine whether the given function is a non-placement
1596/// deallocation function.
1597static bool isNonPlacementDeallocationFunction(Sema &S, FunctionDecl *FD) {
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD))
  return S.isUsualDeallocationFunction(Method);

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();
1620}

1622namespace {
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 (NumBaseParams < FD->getNumParams() &&
        S.Context.hasSameUnqualifiedType(
            FD->getParamDecl(NumBaseParams)->getType(),
            S.Context.getSizeType())) {
      ++NumBaseParams;
      HasSizeT = true;
    }

    if (NumBaseParams < FD->getNumParams() &&
        FD->getParamDecl(NumBaseParams)->getType()->isAlignValT()) {
      ++NumBaseParams;
      HasAlignValT = true;
    }

    // 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);
  }

  explicit 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;
};
1687}

1689/// Determine whether a type has new-extended alignment. This may be called when
1690/// the type is incomplete (for a delete-expression with an incomplete pointee
1691/// type), in which case it will conservatively return false if the alignment is
1692/// not known.
1693static bool hasNewExtendedAlignment(Sema &S, QualType AllocType) {
return S.getLangOpts().AlignedAllocation &&
       S.getASTContext().getTypeAlignIfKnown(AllocType) >
           S.getASTContext().getTargetInfo().getNewAlign();
1697}

1699/// Select the correct "usual" deallocation function to use from a selection of
1700/// deallocation functions (either global or class-scope).
1701static 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;
1733}

1735/// Determine whether a given type is a class for which 'delete[]' would call
1736/// a member 'operator delete[]' with a 'size_t' parameter. This implies that
1737/// we need to store the array size (even if the type is
1738/// trivially-destructible).
1739static 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;
1769}

1771/// Parsed a C++ 'new' expression (C++ 5.3.4).
1772///
1773/// E.g.:
1774/// @code new (memory) int[size][4] @endcode
1775/// or
1776/// @code ::new Foo(23, "hello") @endcode
1777///
1778/// \param StartLoc The first location of the expression.
1779/// \param UseGlobal True if 'new' was prefixed with '::'.
1780/// \param PlacementLParen Opening paren of the placement arguments.
1781/// \param PlacementArgs Placement new arguments.
1782/// \param PlacementRParen Closing paren of the placement arguments.
1783/// \param TypeIdParens If the type is in parens, the source range.
1784/// \param D The type to be allocated, as well as array dimensions.
1785/// \param Initializer The initializing expression or initializer-list, or null
1786///   if there is none.
1787ExprResult
1788Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
                SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
                SourceLocation PlacementRParen, SourceRange TypeIdParens,
                Declarator &D, Expr *Initializer) {
Optional<Expr *> ArraySize;
// 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 && !Initializer)
    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()) {
        // FIXME: GCC permits constant folding here. We should either do so consistently
        // or not do so at all, rather than changing behavior in C++14 onwards.
        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.
          llvm::APSInt Value(Context.getIntWidth(Context.getSizeType()));
          Array.NumElts
           = CheckConvertedConstantExpression(NumElts, Context.getSizeType(), Value,
                                              CCEK_ArrayBound)
               .get();
        } else {
          Array.NumElts =
              VerifyIntegerConstantExpression(
                  NumElts, nullptr, diag::err_new_array_nonconst, AllowFold)
                  .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.getEndLoc()), UseGlobal,
                   PlacementLParen, PlacementArgs, PlacementRParen,
                   TypeIdParens, AllocType, TInfo, ArraySize, DirectInitRange,
                   Initializer);
1857}

1859static 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) &&((void)0)
         "Shouldn't create list CXXConstructExprs for arrays.")((void)0);
  return true;
}
return false;
1876}

1878bool
1879Sema::isUnavailableAlignedAllocationFunction(const FunctionDecl &FD) const {
if (!getLangOpts().AlignedAllocationUnavailable)
  return false;
if (FD.isDefined())
  return false;
Optional<unsigned> AlignmentParam;
if (FD.isReplaceableGlobalAllocationFunction(&AlignmentParam) &&
    AlignmentParam.hasValue())
  return true;
return false;
1889}

1891// Emit a diagnostic if an aligned allocation/deallocation function that is not
1892// implemented in the standard library is selected.
1893void Sema::diagnoseUnavailableAlignedAllocation(const FunctionDecl &FD,
                                              SourceLocation Loc) {
if (isUnavailableAlignedAllocationFunction(FD)) {
  const llvm::Triple &T = getASTContext().getTargetInfo().getTriple();
  StringRef OSName = AvailabilityAttr::getPlatformNameSourceSpelling(
      getASTContext().getTargetInfo().getPlatformName());
  VersionTuple OSVersion = alignedAllocMinVersion(T.getOS());

  OverloadedOperatorKind Kind = FD.getDeclName().getCXXOverloadedOperator();
  bool IsDelete = Kind == OO_Delete || Kind == OO_Array_Delete;
  Diag(Loc, diag::err_aligned_allocation_unavailable)
      << IsDelete << FD.getType().getAsString() << OSName
      << OSVersion.getAsString() << OSVersion.empty();
  Diag(Loc, diag::note_silence_aligned_allocation_unavailable);
}
1908}

1910ExprResult
1911Sema::BuildCXXNew(SourceRange Range, bool UseGlobal,
                SourceLocation PlacementLParen,
                MultiExprArg PlacementArgs,
                SourceLocation PlacementRParen,
                SourceRange TypeIdParens,
                QualType AllocType,
                TypeSourceInfo *AllocTypeInfo,
                Optional<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.")((void)0);
  initStyle = CXXNewExpr::CallInit;
} else if (Initializer && isa<InitListExpr>(Initializer))
  initStyle = CXXNewExpr::ListInit;
else {
  assert((!Initializer || isa<ImplicitValueInitExpr>(Initializer) ||((void)0)
          isa<CXXConstructExpr>(Initializer)) &&((void)0)
         "Initializer expression that cannot have been implicitly created.")((void)0);
  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")((void)0);
  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->getBeginLoc(),
                      Initializer->getEndLoc())
                : 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 ? (*ArraySize)->getExprLoc() : TypeRange.getBegin(),
             diag::err_deduced_class_template_compound_type)
        << /*array*/ 2
        << (ArraySize ? (*ArraySize)->getSourceRange() : TypeRange));

  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->getBeginLoc(),
                          diag::err_auto_new_ctor_multiple_expressions)
                     << AllocType << TypeRange);
  }
  if (Braced && !getLangOpts().CPlusPlus17)
    Diag(Initializer->getBeginLoc(), 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();

// 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 &&
    (*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 && !(*ArraySize)->isTypeDependent()) {
  ExprResult ConvertedSize;
  if (getLangOpts().CPlusPlus14) {
    assert(Context.getTargetInfo().getIntWidth() && "Builtin type of size 0?")((void)0);

    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()) {
    // 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 (Optional<llvm::APSInt> Value =
            (*ArraySize)->getIntegerConstantExpr(Context)) {
      if (Value->isSigned() && Value->isNegative()) {
        return ExprError(Diag((*ArraySize)->getBeginLoc(),
                              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)->getBeginLoc(), diag::err_array_too_large)
              << toString(*Value, 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)->getBeginLoc(), 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;

AllocationFunctionScope Scope = UseGlobal ? AFS_Global : AFS_Both;
if (!AllocType->isDependentType() &&
    !Expr::hasAnyTypeDependentArguments(PlacementArgs) &&
    FindAllocationFunctions(
        StartLoc, SourceRange(PlacementLParen, PlacementRParen), Scope, Scope,
        AllocType, ArraySize.hasValue(), 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) {
  auto *Proto = OperatorNew->getType()->castAs<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.
  unsigned NumImplicitArgs = PassAlignment ? 2 : 1;
  if (GatherArgumentsForCall(PlacementLParen, OperatorNew, Proto,
                             NumImplicitArgs, PlacementArgs, AllPlaceArgs,
                             CallType))
    return ExprError();

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

  // We would like to perform some checking on the given `operator new` call,
  // but the PlacementArgs does not contain the implicit arguments,
  // namely allocation size and maybe allocation alignment,
  // so we need to conjure them.

  QualType SizeTy = Context.getSizeType();
  unsigned SizeTyWidth = Context.getTypeSize(SizeTy);

  llvm::APInt SingleEltSize(
      SizeTyWidth, Context.getTypeSizeInChars(AllocType).getQuantity());

  // How many bytes do we want to allocate here?
  llvm::Optional<llvm::APInt> AllocationSize;
  if (!ArraySize.hasValue() && !AllocType->isDependentType()) {
    // For non-array operator new, we only want to allocate one element.
    AllocationSize = SingleEltSize;
  } else if (KnownArraySize.hasValue() && !AllocType->isDependentType()) {
    // For array operator new, only deal with static array size case.
    bool Overflow;
    AllocationSize = llvm::APInt(SizeTyWidth, *KnownArraySize)
                         .umul_ov(SingleEltSize, Overflow);
    (void)Overflow;
    assert(((void)0)
        !Overflow &&((void)0)
        "Expected that all the overflows would have been handled already.")((void)0);
  }

  IntegerLiteral AllocationSizeLiteral(
      Context,
      AllocationSize.getValueOr(llvm::APInt::getNullValue(SizeTyWidth)),
      SizeTy, SourceLocation());
  // Otherwise, if we failed to constant-fold the allocation size, we'll
  // just give up and pass-in something opaque, that isn't a null pointer.
  OpaqueValueExpr OpaqueAllocationSize(SourceLocation(), SizeTy, VK_PRValue,
                                       OK_Ordinary, /*SourceExpr=*/nullptr);

  // Let's synthesize the alignment argument in case we will need it.
  // Since we *really* want to allocate these on stack, this is slightly ugly
  // because there might not be a `std::align_val_t` type.
  EnumDecl *StdAlignValT = getStdAlignValT();
  QualType AlignValT =
      StdAlignValT ? Context.getTypeDeclType(StdAlignValT) : SizeTy;
  IntegerLiteral AlignmentLiteral(
      Context,
      llvm::APInt(Context.getTypeSize(SizeTy),
                  Alignment / Context.getCharWidth()),
      SizeTy, SourceLocation());
  ImplicitCastExpr DesiredAlignment(ImplicitCastExpr::OnStack, AlignValT,
                                    CK_IntegralCast, &AlignmentLiteral,
                                    VK_PRValue, FPOptionsOverride());

  // Adjust placement args by prepending conjured size and alignment exprs.
  llvm::SmallVector<Expr *, 8> CallArgs;
  CallArgs.reserve(NumImplicitArgs + PlacementArgs.size());
  CallArgs.emplace_back(AllocationSize.hasValue()
                            ? static_cast<Expr *>(&AllocationSizeLiteral)
                            : &OpaqueAllocationSize);
  if (PassAlignment)
    CallArgs.emplace_back(&DesiredAlignment);
  CallArgs.insert(CallArgs.end(), PlacementArgs.begin(), PlacementArgs.end());

  DiagnoseSentinelCalls(OperatorNew, PlacementLParen, CallArgs);

  checkCall(OperatorNew, Proto, /*ThisArg=*/nullptr, CallArgs,
            /*IsMemberFunction=*/false, StartLoc, Range, CallType);

  // Warn if the type is over-aligned and is being allocated by (unaligned)
  // global operator new.
  if (PlacementArgs.empty() && !PassAlignment &&
      (OperatorNew->isImplicit() ||
       (OperatorNew->getBeginLoc().isValid() &&
        getSourceManager().isInSystemHeader(OperatorNew->getBeginLoc())))) {
    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]->getBeginLoc(),
                        Inits[NumInits - 1]->getEndLoc());
  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),
        *ArraySize, 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();

  // FIXME: If we have a KnownArraySize, check that the array bound of the
  // initializer is no greater than that constant value.

  if (ArraySize && !*ArraySize) {
    auto *CAT = Context.getAsConstantArrayType(Initializer->getType());
    if (CAT) {
      // FIXME: Track that the array size was inferred rather than explicitly
      // specified.
      ArraySize = IntegerLiteral::Create(
          Context, CAT->getSize(), Context.getSizeType(), TypeRange.getEnd());
    } else {
      Diag(TypeRange.getEnd(), diag::err_new_array_size_unknown_from_init)
          << Initializer->getSourceRange();
    }
  }
}

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

return CXXNewExpr::Create(Context, UseGlobal, OperatorNew, OperatorDelete,
                          PassAlignment, UsualArrayDeleteWantsSize,
                          PlacementArgs, TypeIdParens, ArraySize, initStyle,
                          Initializer, ResultType, AllocTypeInfo, Range,
                          DirectInitRange);
2383}

2385/// Checks that a type is suitable as the allocated type
2386/// in a new-expression.
2387bool 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() &&
         RequireCompleteSizedType(
             Loc, AllocType, diag::err_new_incomplete_or_sizeless_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 &&
         !getLangOpts().OpenCLCPlusPlus)
  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;
2423}

2425static 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) {
    // If this is an allocation of the form 'new (p) X' for some object
    // pointer p (or an expression that will decay to such a pointer),
    // diagnose the missing inclusion of <new>.
    if (!R.isClassLookup() && Args.size() == 2 &&
        (Args[1]->getType()->isObjectPointerType() ||
         Args[1]->getType()->isArrayType())) {
      S.Diag(R.getNameLoc(), diag::err_need_header_before_placement_new)
          << R.getLookupName() << Range;
      // Listing the candidates is unlikely to be useful; skip it.
      return true;
    }

    // Finish checking all candidates before we note any. This checking can
    // produce additional diagnostics so can't be interleaved with our
    // emission of notes.
    //
    // For an aligned allocation, separately check the aligned and unaligned
    // candidates with their respective argument lists.
    SmallVector<OverloadCandidate*, 32> Cands;
    SmallVector<OverloadCandidate*, 32> AlignedCands;
    llvm::SmallVector<Expr*, 4> AlignedArgs;
    if (AlignedCandidates) {
      auto IsAligned = [](OverloadCandidate &C) {
        return C.Function->getNumParams() > 1 &&
               C.Function->getParamDecl(1)->getType()->isAlignValT();
      };
      auto IsUnaligned = [&](OverloadCandidate &C) { return !IsAligned(C); };

      AlignedArgs.reserve(Args.size() + 1);
      AlignedArgs.push_back(Args[0]);
      AlignedArgs.push_back(AlignArg);
      AlignedArgs.append(Args.begin() + 1, Args.end());
      AlignedCands = AlignedCandidates->CompleteCandidates(
          S, OCD_AllCandidates, AlignedArgs, R.getNameLoc(), IsAligned);

      Cands = Candidates.CompleteCandidates(S, OCD_AllCandidates, Args,
                                            R.getNameLoc(), IsUnaligned);
    } else {
      Cands = Candidates.CompleteCandidates(S, OCD_AllCandidates, Args,
                                            R.getNameLoc());
    }

    S.Diag(R.getNameLoc(), diag::err_ovl_no_viable_function_in_call)
        << R.getLookupName() << Range;
    if (AlignedCandidates)
      AlignedCandidates->NoteCandidates(S, AlignedArgs, AlignedCands, "",
                                        R.getNameLoc());
    Candidates.NoteCandidates(S, Args, Cands, "", R.getNameLoc());
  }
  return true;

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

case OR_Deleted: {
  if (Diagnose) {
    Candidates.NoteCandidates(
        PartialDiagnosticAt(R.getNameLoc(),
                            S.PDiag(diag::err_ovl_deleted_call)
                                << R.getLookupName() << Range),
        S, OCD_AllCandidates, Args);
  }
  return true;
}
}
llvm_unreachable("Unreachable, bad result from BestViableFunction")__builtin_unreachable();
2569}

2571bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
                                 AllocationFunctionScope NewScope,
                                 AllocationFunctionScope DeleteScope,
                                 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 looking in AFS_Global scope for allocation functions, only look in
//    the global scope. Else, if AFS_Class, only look in the scope of the
//    allocated class. If AFS_Both, look in both.
// 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() && NewScope != AFS_Global)
    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()) {
    if (NewScope == AFS_Class)
      return true;

    LookupQualifiedName(R, Context.getTranslationUnitDecl());
  }

  if (getLangOpts().OpenCLCPlusPlus && R.empty()) {
    if (PlaceArgs.empty()) {
      Diag(StartLoc, diag::err_openclcxx_not_supported) << "default new";
    } else {
      Diag(StartLoc, diag::err_openclcxx_placement_new);
    }
    return true;
  }

  assert(!R.empty() && "implicitly declared allocation functions not found")((void)0);
  assert(!R.isAmbiguous() && "global allocation functions are ambiguous")((void)0);

  // 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() && DeleteScope != AFS_Global) {
  auto *RD =
      cast<CXXRecordDecl>(AllocElemType->castAs<RecordType>()->getDecl());
  LookupQualifiedName(FoundDelete, RD);
}
if (FoundDelete.isAmbiguous())
  return true; // FIXME: clean up expressions?

// Filter out any destroying operator deletes. We can't possibly call such a
// function in this context, because we're handling the case where the object
// was not successfully constructed.
// FIXME: This is not covered by the language rules yet.
{
  LookupResult::Filter Filter = FoundDelete.makeFilter();
  while (Filter.hasNext()) {
    auto *FD = dyn_cast<FunctionDecl>(Filter.next()->getUnderlyingDecl());
    if (FD && FD->isDestroyingOperatorDelete())
      Filter.erase();
  }
  Filter.done();
}

bool FoundGlobalDelete = FoundDelete.empty();
if (FoundDelete.empty()) {
  FoundDelete.clear(LookupOrdinaryName);

  if (DeleteScope == AFS_Class)
    return true;

  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;
  {
    auto *Proto = OperatorNew->getType()->castAs<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()->getBeginLoc(),
                                        PlaceArgs.back()->getEndLoc());
      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;
2881}

2883/// DeclareGlobalNewDelete - Declare the global forms of operator new and
2884/// delete. These are:
2885/// @code
2886///   // C++03:
2887///   void* operator new(std::size_t) throw(std::bad_alloc);
2888///   void* operator new[](std::size_t) throw(std::bad_alloc);
2889///   void operator delete(void *) throw();
2890///   void operator delete[](void *) throw();
2891///   // C++11:
2892///   void* operator new(std::size_t);
2893///   void* operator new[](std::size_t);
2894///   void operator delete(void *) noexcept;
2895///   void operator delete[](void *) noexcept;
2896///   // C++1y:
2897///   void* operator new(std::size_t);
2898///   void* operator new[](std::size_t);
2899///   void operator delete(void *) noexcept;
2900///   void operator delete[](void *) noexcept;
2901///   void operator delete(void *, std::size_t) noexcept;
2902///   void operator delete[](void *, std::size_t) noexcept;
2903/// @endcode
2904/// Note that the placement and nothrow forms of new are *not* implicitly
2905/// declared. Their use requires including \<new\>.
2906void Sema::DeclareGlobalNewDelete() {
if (GlobalNewDeleteDeclared)
  return;

// The implicitly declared new and delete operators
// are not supported in OpenCL.
if (getLangOpts().OpenCLCPlusPlus)
  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);
3005}

3007/// DeclareGlobalAllocationFunction - Declares a single implicit global
3008/// allocation function if it doesn't already exist.
3009void 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(Context.getDefaultCallingConvention(
    /*IsVariadic=*/false, /*IsCXXMethod=*/false, /*IsBuiltin=*/true));

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")((void)0);
    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();

  Alloc->addAttr(VisibilityAttr::CreateImplicit(
      Context, LangOpts.GlobalAllocationFunctionVisibilityHidden
                   ? VisibilityAttr::Hidden
                   : 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);
  AddKnownFunctionAttributesForReplaceableGlobalAllocationFunction(Alloc);
  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));
}
3093}

3095FunctionDecl *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?")((void)0);
return Result.FD;
3112}

3114FunctionDecl *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);
3129}

3131bool 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;
3201}

3203namespace {
3204/// Checks whether delete-expression, and new-expression used for
3205///  initializing deletee have the same array form.
3206class MismatchingNewDeleteDetector {
3207public:
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) {}

/// 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);
/// 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;

3249private:
const bool EndOfTU;
/// Indicates that there is at least one constructor without body.
bool HasUndefinedConstructors;
/// 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);
/// 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);
/// 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);
/// 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);
/// 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();
3288};
3289}

3291MismatchingNewDeleteDetector::MismatchResult
3292MismatchingNewDeleteDetector::analyzeDeleteExpr(const CXXDeleteExpr *DE) {
NewExprs.clear();
assert(DE && "Expected delete-expression")((void)0);
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;
3304}

3306const CXXNewExpr *
3307MismatchingNewDeleteDetector::getNewExprFromInitListOrExpr(const Expr *E) {
assert(E != nullptr && "Expected a valid initializer expression")((void)0);
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);
3316}

3318bool 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;
3329}

3331bool 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;
3345}

3347MismatchingNewDeleteDetector::MismatchResult
3348MismatchingNewDeleteDetector::analyzeInClassInitializer() {
assert(Field != nullptr && "This should be called only for members")((void)0);
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;
3360}

3362MismatchingNewDeleteDetector::MismatchResult
3363MismatchingNewDeleteDetector::analyzeField(FieldDecl *Field,
                                         bool DeleteWasArrayForm) {
assert(Field != nullptr && "Analysis requires a valid class member.")((void)0);
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;
3379}

3381MismatchingNewDeleteDetector::MismatchResult
3382MismatchingNewDeleteDetector::analyzeMemberExpr(const MemberExpr *ME) {
assert(ME != nullptr && "Expected a member expression")((void)0);
if (FieldDecl *F = dyn_cast<FieldDecl>(ME->getMemberDecl()))
  return analyzeField(F, IsArrayForm);
return NoMismatch;
3387}

3389bool 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();
3398}

3400static void
3401DiagnoseMismatchedNewDelete(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;
3420}

3422void 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->getBeginLoc(), Detector);
  break;
}
case MismatchingNewDeleteDetector::AnalyzeLater: {
  DeleteExprs[Detector.Field].push_back(
      std::make_pair(DE->getBeginLoc(), DE->isArrayForm()));
  break;
}
case MismatchingNewDeleteDetector::NoMismatch:
  break;
}
3440}

3442void 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.")__builtin_unreachable();
case MismatchingNewDeleteDetector::AnalyzeLater:
  llvm_unreachable("Analysis cannot be postponed any point beyond end of "__builtin_unreachable()
                   "translation unit.")__builtin_unreachable();
case MismatchingNewDeleteDetector::MemberInitMismatches:
  DiagnoseMismatchedNewDelete(*this, DeleteLoc, Detector);
  break;
case MismatchingNewDeleteDetector::NoMismatch:
  break;
}
3457}

3459/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
3460/// @code ::delete ptr; @endcode
3461/// or
3462/// @code delete [] ptr; @endcode
3463ExprResult
3464Sema::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")__builtin_unreachable();
    }
  } 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->castAs<PointerType>()->getPointeeType();
  QualType PointeeElem = Context.getBaseElementType(Pointee);

  if (Pointee.getAddressSpace() != LangAS::Default &&
      !getLangOpts().OpenCLCPlusPlus)
    return Diag(Ex.get()->getBeginLoc(),
                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() ||
             Pointee->isSizelessType()) {
    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) {
    if (getLangOpts().OpenCLCPlusPlus) {
      Diag(StartLoc, diag::err_openclcxx_not_supported) << "default delete";
      return ExprError();
    }

    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();
    }
  }

  DiagnoseUseOfDecl(OperatorDelete, StartLoc);

  // 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;
3685}

3687static bool resolveBuiltinNewDeleteOverload(Sema &S, CallExpr *TheCall,
                                          bool IsDelete,
                                          FunctionDecl *&Operator) {

DeclarationName NewName = S.Context.DeclarationNames.getCXXOperatorName(
    IsDelete ? OO_Delete : OO_New);

LookupResult R(S, NewName, TheCall->getBeginLoc(), Sema::LookupOrdinaryName);
S.LookupQualifiedName(R, S.Context.getTranslationUnitDecl());
assert(!R.empty() && "implicitly declared allocation functions not found")((void)0);
assert(!R.isAmbiguous() && "global allocation functions are ambiguous")((void)0);

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

SmallVector<Expr *, 8> Args(TheCall->arg_begin(), TheCall->arg_end());
OverloadCandidateSet Candidates(R.getNameLoc(),
                                OverloadCandidateSet::CSK_Normal);
for (LookupResult::iterator FnOvl = R.begin(), FnOvlEnd = R.end();
     FnOvl != FnOvlEnd; ++FnOvl) {
  // Even member operator new/delete are implicitly treated as
  // static, so don't use AddMemberCandidate.
  NamedDecl *D = (*FnOvl)->getUnderlyingDecl();

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

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

SourceRange Range = TheCall->getSourceRange();

// Do the resolution.
OverloadCandidateSet::iterator Best;
switch (Candidates.BestViableFunction(S, R.getNameLoc(), Best)) {
case OR_Success: {
  // Got one!
  FunctionDecl *FnDecl = Best->Function;
  assert(R.getNamingClass() == nullptr &&((void)0)
         "class members should not be considered")((void)0);

  if (!FnDecl->isReplaceableGlobalAllocationFunction()) {
    S.Diag(R.getNameLoc(), diag::err_builtin_operator_new_delete_not_usual)
        << (IsDelete ? 1 : 0) << Range;
    S.Diag(FnDecl->getLocation(), diag::note_non_usual_function_declared_here)
        << R.getLookupName() << FnDecl->getSourceRange();
    return true;
  }

  Operator = FnDecl;
  return false;
}

case OR_No_Viable_Function:
  Candidates.NoteCandidates(
      PartialDiagnosticAt(R.getNameLoc(),
                          S.PDiag(diag::err_ovl_no_viable_function_in_call)
                              << R.getLookupName() << Range),
      S, OCD_AllCandidates, Args);
  return true;

case OR_Ambiguous:
  Candidates.NoteCandidates(
      PartialDiagnosticAt(R.getNameLoc(),
                          S.PDiag(diag::err_ovl_ambiguous_call)
                              << R.getLookupName() << Range),
      S, OCD_AmbiguousCandidates, Args);
  return true;

case OR_Deleted: {
  Candidates.NoteCandidates(
      PartialDiagnosticAt(R.getNameLoc(), S.PDiag(diag::err_ovl_deleted_call)
                                              << R.getLookupName() << Range),
      S, OCD_AllCandidates, Args);
  return true;
}
}
llvm_unreachable("Unreachable, bad result from BestViableFunction")__builtin_unreachable();
3772}

3774ExprResult
3775Sema::SemaBuiltinOperatorNewDeleteOverloaded(ExprResult TheCallResult,
                                           bool IsDelete) {
CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
if (!getLangOpts().CPlusPlus) {
  Diag(TheCall->getExprLoc(), diag::err_builtin_requires_language)
      << (IsDelete ? "__builtin_operator_delete" : "__builtin_operator_new")
      << "C++";
  return ExprError();
}
// CodeGen assumes it can find the global new and delete to call,
// so ensure that they are declared.
DeclareGlobalNewDelete();

FunctionDecl *OperatorNewOrDelete = nullptr;
if (resolveBuiltinNewDeleteOverload(*this, TheCall, IsDelete,
                                    OperatorNewOrDelete))
  return ExprError();
assert(OperatorNewOrDelete && "should be found")((void)0);

DiagnoseUseOfDecl(OperatorNewOrDelete, TheCall->getExprLoc());
MarkFunctionReferenced(TheCall->getExprLoc(), OperatorNewOrDelete);

TheCall->setType(OperatorNewOrDelete->getReturnType());
for (unsigned i = 0; i != TheCall->getNumArgs(); ++i) {
  QualType ParamTy = OperatorNewOrDelete->getParamDecl(i)->getType();
  InitializedEntity Entity =
      InitializedEntity::InitializeParameter(Context, ParamTy, false);
  ExprResult Arg = PerformCopyInitialization(
      Entity, TheCall->getArg(i)->getBeginLoc(), TheCall->getArg(i));
  if (Arg.isInvalid())
    return ExprError();
  TheCall->setArg(i, Arg.get());
}
auto Callee = dyn_cast<ImplicitCastExpr>(TheCall->getCallee());
assert(Callee && Callee->getCastKind() == CK_BuiltinFnToFnPtr &&((void)0)
       "Callee expected to be implicit cast to a builtin function pointer")((void)0);
Callee->setType(OperatorNewOrDelete->getType());

return TheCallResult;
3814}

3816void 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()->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 + "::");
}
3859}

3861Sema::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);
3870}

3872/// Check the use of the given variable as a C++ condition in an if,
3873/// while, do-while, or switch statement.
3874ExprResult 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 = BuildDeclRefExpr(
    ConditionVar, ConditionVar->getType().getNonReferenceType(), VK_LValue,
    ConditionVar->getLocation());

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")__builtin_unreachable();
3909}

3911/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
3912ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr) {
// C++11 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.
//
// C++2b 8.5.2p2
// If the if statement is of the form if constexpr, the value of the condition
// is contextually converted to bool and the converted expression shall be
// a constant expression.
//

ExprResult E = PerformContextuallyConvertToBool(CondExpr);
if (!IsConstexpr || E.isInvalid() || E.get()->isValueDependent())
  return E;

// FIXME: Return this value to the caller so they don't need to recompute it.
llvm::APSInt Cond;
E = VerifyIntegerConstantExpression(
    E.get(), &Cond,
    diag::err_constexpr_if_condition_expression_is_not_constant);
return E;
3937}

3939/// Helper function to determine whether this is the (deprecated) C++
3940/// conversion from a string literal to a pointer to non-const char or
3941/// non-const wchar_t (for narrow and wide string literals,
3942/// respectively).
3943bool
3944Sema::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;
3977}

3979static 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!")__builtin_unreachable();
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, Ty, 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!")((void)0);

  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(),
                                    S.CurFPFeatureOverrides());

  return S.MaybeBindToTemporary(Result.get());
}
}
4039}

4041/// PerformImplicitConversion - Perform an implicit conversion of the
4042/// expression From to the type ToType using the pre-computed implicit
4043/// conversion sequence ICS. Returns the converted
4044/// expression. Action is the kind of conversion we're performing,
4045/// used in the error message.
4046ExprResult
4047Sema::PerformImplicitConversion(Expr *From, QualType ToType,
                              const ImplicitConversionSequence &ICS,
                              AssignmentAction Action,
                              CheckedConversionKind CCK) {
// C++ [over.match.oper]p7: [...] operands of class type are converted [...]
if (CCK == CCK_ForBuiltinOverloadedOp && !From->getType()->isRecordType())
  return From;

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")((void)0);
    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->getBeginLoc(), ToType.getNonReferenceType(), CastKind,
        cast<CXXMethodDecl>(FD), ICS.UserDefined.FoundConversionFunction,
        ICS.UserDefined.HadMultipleCandidates, From);

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

    From = CastArg.get();

    // C++ [over.match.oper]p7:
    //   [...] the second standard conversion sequence of a user-defined
    //   conversion sequence is not applied.
    if (CCK == CCK_ForBuiltinOverloadedOp)
      return From;

    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")__builtin_unreachable();

case ImplicitConversionSequence::BadConversion:
  Sema::AssignConvertType ConvTy =
      CheckAssignmentConstraints(From->getExprLoc(), ToType, From->getType());
  bool Diagnosed = DiagnoseAssignmentResult(
      ConvTy == Compatible ? Incompatible : ConvTy, From->getExprLoc(),
      ToType, From->getType(), From, Action);
  assert(Diagnosed && "failed to diagnose bad conversion")((void)0); (void)Diagnosed;
  return ExprError();
}

// Everything went well.
return From;
4141}

4143/// PerformImplicitConversion - Perform an implicit conversion of the
4144/// expression From to the type ToType by following the standard
4145/// conversion sequence SCS. Returns the converted
4146/// expression. Flavor is the context in which we're performing this
4147/// conversion, for use in error messages.
4148ExprResult
4149Sema::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())((void)0);
  if (SCS.Second == ICK_Derived_To_Base) {
    SmallVector<Expr*, 8> ConstructorArgs;
    if (CompleteConstructorCall(
            cast<CXXConstructorDecl>(SCS.CopyConstructor), ToType, 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->getBeginLoc()))
    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_PRValue,
                                    FPOptionsOverride());
  }
  break;

case ICK_Lvalue_To_Rvalue: {
  assert(From->getObjectKind() != OK_ObjCProperty)((void)0);
  ExprResult FromRes = DefaultLvalueConversion(From);
  if (FromRes.isInvalid())
    return ExprError();

  From = FromRes.get();
  FromType = From->getType();
  break;
}

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

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

default:
  llvm_unreachable("Improper first standard conversion")__builtin_unreachable();
}

// 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() &&((void)0)
           SCS.Second == ICK_Integral_Promotion &&((void)0)
           "only enums with fixed underlying type can promote to bool")((void)0);
    From = ImpCastExprToType(From, ToType, CK_IntegralToBoolean, VK_PRValue,
                             /*BasePath=*/nullptr, CCK)
               .get();
  } else {
    From = ImpCastExprToType(From, ToType, CK_IntegralCast, VK_PRValue,
                             /*BasePath=*/nullptr, CCK)
               .get();
  }
  break;

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

case ICK_Complex_Promotion:
case ICK_Complex_Conversion: {
  QualType FromEl = From->getType()->castAs<ComplexType>()->getElementType();
  QualType ToEl = ToType->castAs<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_PRValue, /*BasePath=*/nullptr,
                           CCK)
             .get();
  break;
}

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

case ICK_Compatible_Conversion:
  From = ImpCastExprToType(From, ToType, CK_NoOp, From->getValueKind(),
                           /*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->getBeginLoc(),
           diag::ext_typecheck_convert_incompatible_pointer)
          << ToType << From->getType() << Action << From->getSourceRange()
          << 0;
    else
      Diag(From->getBeginLoc(),
           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->getBeginLoc(), diag::err_arc_weak_unavailable_assign);
    else
      Diag(From->getBeginLoc(), diag::err_arc_convesion_of_weak_unavailable)
          << (Action == AA_Casting) << From->getType() << ToType
          << From->getSourceRange();
  }

  // Defer address space conversion to the third conversion.
  QualType FromPteeType = From->getType()->getPointeeType();
  QualType ToPteeType = ToType->getPointeeType();
  QualType NewToType = ToType;
  if (!FromPteeType.isNull() && !ToPteeType.isNull() &&
      FromPteeType.getAddressSpace() != ToPteeType.getAddressSpace()) {
    NewToType = Context.removeAddrSpaceQualType(ToPteeType);
    NewToType = Context.getAddrSpaceQualType(NewToType,
                                             FromPteeType.getAddressSpace());
    if (ToType->isObjCObjectPointerType())
      NewToType = Context.getObjCObjectPointerType(NewToType);
    else if (ToType->isBlockPointerType())
      NewToType = Context.getBlockPointerType(NewToType);
    else
      NewToType = Context.getPointerType(NewToType);
  }

  CastKind Kind;
  CXXCastPath BasePath;
  if (CheckPointerConversion(From, NewToType, 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(), NewToType, From, CCK);
  From = ImpCastExprToType(From, NewToType, Kind, VK_PRValue, &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_PRValue, &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_PRValue,
                           /*BasePath=*/nullptr, CCK)
             .get();
  break;

case ICK_Derived_To_Base: {
  CXXCastPath BasePath;
  if (CheckDerivedToBaseConversion(
          From->getType(), ToType.getNonReferenceType(), From->getBeginLoc(),
          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_PRValue,
                           /*BasePath=*/nullptr, CCK)
             .get();
  break;

case ICK_SVE_Vector_Conversion:
  From = ImpCastExprToType(From, ToType, CK_BitCast, VK_PRValue,
                           /*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_PRValue,
                           /*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())((void)0);
      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 {
    auto *FromComplex = From->getType()->castAs<ComplexType>();
    QualType ElType = FromComplex->getElementType();
    bool isFloatingComplex = ElType->isRealFloatingType();

    // _Complex x -> x
    From = ImpCastExprToType(From, ElType,
                             isFloatingComplex ? CK_FloatingComplexToReal
                                               : CK_IntegralComplexToReal,
                             VK_PRValue, /*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_PRValue, /*BasePath=*/nullptr, CCK)
                 .get();
    } else {
      assert(ToType->isIntegerType())((void)0);
      From = ImpCastExprToType(From, ToType,
                               isFloatingComplex ? CK_FloatingToIntegral
                                                 : CK_IntegralCast,
                               VK_PRValue, /*BasePath=*/nullptr, CCK)
                 .get();
    }
  }
  break;

case ICK_Block_Pointer_Conversion: {
  LangAS AddrSpaceL =
      ToType->castAs<BlockPointerType>()->getPointeeType().getAddressSpace();
  LangAS AddrSpaceR =
      FromType->castAs<BlockPointerType>()->getPointeeType().getAddressSpace();
  assert(Qualifiers::isAddressSpaceSupersetOf(AddrSpaceL, AddrSpaceR) &&((void)0)
         "Invalid cast")((void)0);
  CastKind Kind =
      AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
  From = ImpCastExprToType(From, ToType.getUnqualifiedType(), Kind,
                           VK_PRValue, /*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) &&((void)0)
          "Improper transparent union conversion")((void)0);
  (void)ConvTy;
  break;
}

case ICK_Zero_Event_Conversion:
case ICK_Zero_Queue_Conversion:
  From = ImpCastExprToType(From, ToType,
                           CK_ZeroToOCLOpaqueType,
                           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")__builtin_unreachable();
}

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_PRValue,
                           /*BasePath=*/nullptr, CCK)
             .get();
  break;

case ICK_Qualification: {
  ExprValueKind VK = From->getValueKind();
  CastKind CK = CK_NoOp;

  if (ToType->isReferenceType() &&
      ToType->getPointeeType().getAddressSpace() !=
          From->getType().getAddressSpace())
    CK = CK_AddressSpaceConversion;

  if (ToType->isPointerType() &&
      ToType->getPointeeType().getAddressSpace() !=
          From->getType()->getPointeeType().getAddressSpace())
    CK = CK_AddressSpaceConversion;

  From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context), CK, VK,
                           /*BasePath=*/nullptr, CCK)
             .get();

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

  break;
}

default:
  llvm_unreachable("Improper third standard conversion")__builtin_unreachable();
}

// If this conversion sequence involved a scalar -> atomic conversion, perform
// that conversion now.
if (!ToAtomicType.isNull()) {
  assert(Context.hasSameType(((void)0)
      ToAtomicType->castAs<AtomicType>()->getValueType(), From->getType()))((void)0);
  From = ImpCastExprToType(From, ToAtomicType, CK_NonAtomicToAtomic,
                           VK_PRValue, nullptr, CCK)
             .get();
}

// Materialize a temporary if we're implicitly converting to a reference
// type. This is not required by the C++ rules but is necessary to maintain
// AST invariants.
if (ToType->isReferenceType() && From->isPRValue()) {
  ExprResult Res = TemporaryMaterializationConversion(From);
  if (Res.isInvalid())
    return ExprError();
  From = Res.get();
}

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

return From;
4648}

4650/// Check the completeness of a type in a unary type trait.
4651///
4652/// If the particular type trait requires a complete type, tries to complete
4653/// it. If completing the type fails, a diagnostic is emitted and false
4654/// returned. If completing the type succeeds or no completion was required,
4655/// returns true.
4656static 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")__builtin_unreachable();
  // 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[[gnu::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);
}
4771}

4773static 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)
4778{
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;
      auto *CPT = Operator->getType()->castAs<FunctionProtoType>();
      CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
      if (!CPT || !CPT->isNothrow())
        return false;
    }
  }
  return FoundOperator;
}
return false;
4806}

4808static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
                                 SourceLocation KeyLoc, QualType T) {
assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")((void)0);

ASTContext &C = Self.Context;
switch(UTT) {
default: llvm_unreachable("not a UTT")__builtin_unreachable();
  // 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->isAnyPointerType();
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:
  // Enum types should always return false.
  // Floating points should always return true.
  return T->isFloatingType() ||
         (T->isSignedIntegerType() && !T->isEnumeralType());
case UTT_IsUnsigned:
  // Enum types should always return false.
  return T->isUnsignedIntegerType() && !T->isEnumeralType();

  // 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) {
      auto *CPT = Destructor->getType()->castAs<FunctionProtoType>();
      CPT = Self.ResolveExceptionSpec(KeyLoc, CPT);
      if (!CPT || !CPT->isNothrow())
        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;
        auto *CPT = Constructor->getType()->castAs<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() || 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;
        auto *CPT = Constructor->getType()->castAs<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() || 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);
}
5207}

5209static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
                                  QualType RhsT, SourceLocation KeyLoc);

5212static 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())((void)0);

  // 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;

  llvm::BumpPtrAllocator OpaqueExprAllocator;
  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);
    ArgExprs.push_back(
        new (OpaqueExprAllocator.Allocate<OpaqueValueExpr>())
            OpaqueValueExpr(Args[I]->getTypeLoc().getBeginLoc(),
                            ArgTy.getNonLValueExprType(S.Context),
                            Expr::getValueKindForType(ArgTy)));
  }

  // 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")__builtin_unreachable();
  return false;
}
  default: llvm_unreachable("not a TT")__builtin_unreachable();
}

return false;
5329}

5331ExprResult 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);
5354}

5356ExprResult 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);
5372}

5374static bool EvaluateBinaryTypeTrait(Sema &Self, TypeTrait BTT, QualType LhsT,
                                  QualType RhsT, SourceLocation KeyLoc) {
assert(!LhsT->isDependentType() && !RhsT->isDependentType() &&((void)0)
       "Cannot evaluate traits of dependent types")((void)0);

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)((void)0)
           == (lhsRecord == rhsRecord))((void)0);

  // Unions are never base classes, and never have base classes.
  // It doesn't matter if they are complete or not. See PR#41843
  if (lhsRecord && lhsRecord->getDecl()->isUnion())
    return false;
  if (rhsRecord && rhsRecord->getDecl()->isUnion())
    return false;

  if (lhsRecord == rhsRecord)
    return true;

  // 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())
    return false;

  // Treat the assignment as unused for the purpose of -Wdeprecated-volatile.
  Self.CheckUnusedVolatileAssignment(Result.get());

  if (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")__builtin_unreachable();
  return false;
}
  default: llvm_unreachable("not a BTT")__builtin_unreachable();
}
llvm_unreachable("Unknown type trait or not implemented")__builtin_unreachable();
5580}

5582ExprResult 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);
5593}

5595static uint64_t EvaluateArrayTypeTrait(Sema &Self, ArrayTypeTrait ATT,
                                         QualType T, Expr *DimExpr,
                                         SourceLocation KeyLoc) {
assert(!T->isDependentType() && "Cannot evaluate traits of dependent type")((void)0);

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)
          .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")__builtin_unreachable();
5647}

5649ExprResult 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());
5669}

5671ExprResult 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;
5682}

5684static bool EvaluateExpressionTrait(ExpressionTrait ET, Expr *E) {
switch (ET) {
case ET_IsLValueExpr: return E->isLValue();
case ET_IsRValueExpr:
  return E->isPRValue();
}
llvm_unreachable("Expression trait not covered by switch")__builtin_unreachable();
5691}

5693ExprResult 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);
5709}

5711QualType Sema::CheckPointerToMemberOperands(ExprResult &LHS, ExprResult &RHS,
                                          ExprValueKind &VK,
                                          SourceLocation Loc,
                                          bool isIndirect) {
assert(!LHS.get()->getType()->isPlaceholderType() &&((void)0)
       !RHS.get()->getType()->isPlaceholderType() &&((void)0)
       "placeholders should have been weeded out by now")((void)0);

// 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()->isPRValue())
  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()->getBeginLoc(), RHS.get()->getEndLoc()),
          &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_PRValue : 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 their cv-qualifier-seq
      // is (exactly) 'const'.
      if (Proto->isConst() && !Proto->isVolatile())
        Diag(Loc, getLangOpts().CPlusPlus20
                      ? 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_PRValue;
  return Context.BoundMemberTy;
} else if (isIndirect) {
  VK = VK_LValue;
} else {
  VK = LHS.get()->getValueKind();
}

return Result;
5864}

5866/// Try to convert a type to another according to C++11 5.16p3.
5867///
5868/// This is part of the parameter validation for the ? operator. If either
5869/// value operand is a class type, the two operands are attempted to be
5870/// converted to each other. This function does the conversion in one direction.
5871/// It returns true if the program is ill-formed and has already been diagnosed
5872/// as such.
5873static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
                              SourceLocation QuestionLoc,
                              bool &HaveConversion,
                              QualType &ToType) {
HaveConversion = false;
ToType = To->getType();

InitializationKind Kind =
    InitializationKind::CreateCopy(To->getBeginLoc(), 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 converted 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;
5958}

5960/// Try to find a common type for two according to C++0x 5.16p5.
5961///
5962/// This is part of the parameter validation for the ? operator. If either
5963/// value operand is a class type, overload resolution is used to find a
5964/// conversion to a common type.
5965static 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")__builtin_unreachable();
}
return true;
6020}

6022/// Perform an "extended" implicit conversion as returned by
6023/// TryClassUnification.
6024static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) {
InitializedEntity Entity = InitializedEntity::InitializeTemporary(T);
InitializationKind Kind =
    InitializationKind::CreateCopy(E.get()->getBeginLoc(), 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;
6036}

6038// Check the condition operand of ?: to see if it is valid for the GCC
6039// extension.
6040static bool isValidVectorForConditionalCondition(ASTContext &Ctx,
                                               QualType CondTy) {
if (!CondTy->isVectorType() && !CondTy->isExtVectorType())
  return false;
const QualType EltTy =
    cast<VectorType>(CondTy.getCanonicalType())->getElementType();
assert(!EltTy->isBooleanType() && !EltTy->isEnumeralType() &&((void)0)
       "Vectors cant be boolean or enum types")((void)0);
return EltTy->isIntegralType(Ctx);
6049}

6051QualType Sema::CheckVectorConditionalTypes(ExprResult &Cond, ExprResult &LHS,
                                         ExprResult &RHS,
                                         SourceLocation QuestionLoc) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());

QualType CondType = Cond.get()->getType();
const auto *CondVT = CondType->castAs<VectorType>();
QualType CondElementTy = CondVT->getElementType();
unsigned CondElementCount = CondVT->getNumElements();
QualType LHSType = LHS.get()->getType();
const auto *LHSVT = LHSType->getAs<VectorType>();
QualType RHSType = RHS.get()->getType();
const auto *RHSVT = RHSType->getAs<VectorType>();

QualType ResultType;


if (LHSVT && RHSVT) {
  if (isa<ExtVectorType>(CondVT) != isa<ExtVectorType>(LHSVT)) {
    Diag(QuestionLoc, diag::err_conditional_vector_cond_result_mismatch)
        << /*isExtVector*/ isa<ExtVectorType>(CondVT);
    return {};
  }

  // If both are vector types, they must be the same type.
  if (!Context.hasSameType(LHSType, RHSType)) {
    Diag(QuestionLoc, diag::err_conditional_vector_mismatched)
        << LHSType << RHSType;
    return {};
  }
  ResultType = LHSType;
} else if (LHSVT || RHSVT) {
  ResultType = CheckVectorOperands(
      LHS, RHS, QuestionLoc, /*isCompAssign*/ false, /*AllowBothBool*/ true,
      /*AllowBoolConversions*/ false);
  if (ResultType.isNull())
    return {};
} else {