/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp

Bug Summary

File:	tools/clang/lib/Sema/SemaExpr.cpp
Warning:	line 204, column 25 Potential leak of memory pointed to by field 'DiagStorage'

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaExpr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn329677/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-04-11-031539-24776-1 -x c++ /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp

/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp

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1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements semantic analysis for expressions.
11//
12//===----------------------------------------------------------------------===//

14#include "TreeTransform.h"
15#include "clang/AST/ASTConsumer.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/ASTLambda.h"
18#include "clang/AST/ASTMutationListener.h"
19#include "clang/AST/CXXInheritance.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/EvaluatedExprVisitor.h"
23#include "clang/AST/Expr.h"
24#include "clang/AST/ExprCXX.h"
25#include "clang/AST/ExprObjC.h"
26#include "clang/AST/ExprOpenMP.h"
27#include "clang/AST/RecursiveASTVisitor.h"
28#include "clang/AST/TypeLoc.h"
29#include "clang/Basic/PartialDiagnostic.h"
30#include "clang/Basic/SourceManager.h"
31#include "clang/Basic/TargetInfo.h"
32#include "clang/Lex/LiteralSupport.h"
33#include "clang/Lex/Preprocessor.h"
34#include "clang/Sema/AnalysisBasedWarnings.h"
35#include "clang/Sema/DeclSpec.h"
36#include "clang/Sema/DelayedDiagnostic.h"
37#include "clang/Sema/Designator.h"
38#include "clang/Sema/Initialization.h"
39#include "clang/Sema/Lookup.h"
40#include "clang/Sema/ParsedTemplate.h"
41#include "clang/Sema/Scope.h"
42#include "clang/Sema/ScopeInfo.h"
43#include "clang/Sema/SemaFixItUtils.h"
44#include "clang/Sema/SemaInternal.h"
45#include "clang/Sema/Template.h"
46#include "llvm/Support/ConvertUTF.h"
47using namespace clang;
48using namespace sema;

50/// \brief Determine whether the use of this declaration is valid, without
51/// emitting diagnostics.
52bool Sema::CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid) {
// See if this is an auto-typed variable whose initializer we are parsing.
if (ParsingInitForAutoVars.count(D))
  return false;

// See if this is a deleted function.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
  if (FD->isDeleted())
    return false;

  // If the function has a deduced return type, and we can't deduce it,
  // then we can't use it either.
  if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
      DeduceReturnType(FD, SourceLocation(), /*Diagnose*/ false))
    return false;
}

// See if this function is unavailable.
if (TreatUnavailableAsInvalid && D->getAvailability() == AR_Unavailable &&
    cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
  return false;

return true;
75}

77static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) {
// Warn if this is used but marked unused.
if (const auto *A = D->getAttr<UnusedAttr>()) {
  // [[maybe_unused]] should not diagnose uses, but __attribute__((unused))
  // should diagnose them.
  if (A->getSemanticSpelling() != UnusedAttr::CXX11_maybe_unused &&
      A->getSemanticSpelling() != UnusedAttr::C2x_maybe_unused) {
    const Decl *DC = cast_or_null<Decl>(S.getCurObjCLexicalContext());
    if (DC && !DC->hasAttr<UnusedAttr>())
      S.Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
  }
}
89}

91/// \brief Emit a note explaining that this function is deleted.
92void Sema::NoteDeletedFunction(FunctionDecl *Decl) {
assert(Decl->isDeleted())(static_cast <bool> (Decl->isDeleted()) ? void (0) :
 __assert_fail ("Decl->isDeleted()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 93, __extension__ __PRETTY_FUNCTION__));

CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Decl);

if (Method && Method->isDeleted() && Method->isDefaulted()) {
  // If the method was explicitly defaulted, point at that declaration.
  if (!Method->isImplicit())
    Diag(Decl->getLocation(), diag::note_implicitly_deleted);

  // Try to diagnose why this special member function was implicitly
  // deleted. This might fail, if that reason no longer applies.
  CXXSpecialMember CSM = getSpecialMember(Method);
  if (CSM != CXXInvalid)
    ShouldDeleteSpecialMember(Method, CSM, nullptr, /*Diagnose=*/true);

  return;
}

auto *Ctor = dyn_cast<CXXConstructorDecl>(Decl);
if (Ctor && Ctor->isInheritingConstructor())
  return NoteDeletedInheritingConstructor(Ctor);

Diag(Decl->getLocation(), diag::note_availability_specified_here)
  << Decl << true;
117}

119/// \brief Determine whether a FunctionDecl was ever declared with an
120/// explicit storage class.
121static bool hasAnyExplicitStorageClass(const FunctionDecl *D) {
for (auto I : D->redecls()) {
  if (I->getStorageClass() != SC_None)
    return true;
}
return false;
127}

129/// \brief Check whether we're in an extern inline function and referring to a
130/// variable or function with internal linkage (C11 6.7.4p3).
131///
132/// This is only a warning because we used to silently accept this code, but
133/// in many cases it will not behave correctly. This is not enabled in C++ mode
134/// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6)
135/// and so while there may still be user mistakes, most of the time we can't
136/// prove that there are errors.
137static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S,
                                                    const NamedDecl *D,
                                                    SourceLocation Loc) {
// This is disabled under C++; there are too many ways for this to fire in
// contexts where the warning is a false positive, or where it is technically
// correct but benign.
if (S.getLangOpts().CPlusPlus)
  return;

// Check if this is an inlined function or method.
FunctionDecl *Current = S.getCurFunctionDecl();
if (!Current)
  return;
if (!Current->isInlined())
  return;
if (!Current->isExternallyVisible())
  return;

// Check if the decl has internal linkage.
if (D->getFormalLinkage() != InternalLinkage)
  return;

// Downgrade from ExtWarn to Extension if
//  (1) the supposedly external inline function is in the main file,
//      and probably won't be included anywhere else.
//  (2) the thing we're referencing is a pure function.
//  (3) the thing we're referencing is another inline function.
// This last can give us false negatives, but it's better than warning on
// wrappers for simple C library functions.
const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D);
bool DowngradeWarning = S.getSourceManager().isInMainFile(Loc);
if (!DowngradeWarning && UsedFn)
  DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>();

S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline_quiet
                             : diag::ext_internal_in_extern_inline)
  << /*IsVar=*/!UsedFn << D;

S.MaybeSuggestAddingStaticToDecl(Current);

S.Diag(D->getCanonicalDecl()->getLocation(), diag::note_entity_declared_at)
    << D;
179}

181void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) {
const FunctionDecl *First = Cur->getFirstDecl();

// Suggest "static" on the function, if possible.
if (!hasAnyExplicitStorageClass(First)) {
  SourceLocation DeclBegin = First->getSourceRange().getBegin();
  Diag(DeclBegin, diag::note_convert_inline_to_static)
    << Cur << FixItHint::CreateInsertion(DeclBegin, "static ");
}
190}

192/// \brief Determine whether the use of this declaration is valid, and
193/// emit any corresponding diagnostics.
194///
195/// This routine diagnoses various problems with referencing
196/// declarations that can occur when using a declaration. For example,
197/// it might warn if a deprecated or unavailable declaration is being
198/// used, or produce an error (and return true) if a C++0x deleted
199/// function is being used.
200///
201/// \returns true if there was an error (this declaration cannot be
202/// referenced), false otherwise.
203///
204bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
                           const ObjCInterfaceDecl *UnknownObjCClass,
                           bool ObjCPropertyAccess,
                           bool AvoidPartialAvailabilityChecks) {
SourceLocation Loc = Locs.front();
if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
  // If there were any diagnostics suppressed by template argument deduction,
  // emit them now.
  auto Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
  if (Pos != SuppressedDiagnostics.end()) {
    for (const PartialDiagnosticAt &Suppressed : Pos->second)
      Diag(Suppressed.first, Suppressed.second);

    // Clear out the list of suppressed diagnostics, so that we don't emit
    // them again for this specialization. However, we don't obsolete this
    // entry from the table, because we want to avoid ever emitting these
    // diagnostics again.
    Pos->second.clear();
  }

  // C++ [basic.start.main]p3:
  //   The function 'main' shall not be used within a program.
  if (cast<FunctionDecl>(D)->isMain())
    Diag(Loc, diag::ext_main_used);
}

// See if this is an auto-typed variable whose initializer we are parsing.
if (ParsingInitForAutoVars.count(D)) {
  if (isa<BindingDecl>(D)) {
    Diag(Loc, diag::err_binding_cannot_appear_in_own_initializer)
      << D->getDeclName();
  } else {
    Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
      << D->getDeclName() << cast<VarDecl>(D)->getType();
  }
  return true;
}

// See if this is a deleted function.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
  if (FD->isDeleted()) {
    auto *Ctor = dyn_cast<CXXConstructorDecl>(FD);
    if (Ctor && Ctor->isInheritingConstructor())
      Diag(Loc, diag::err_deleted_inherited_ctor_use)
          << Ctor->getParent()
          << Ctor->getInheritedConstructor().getConstructor()->getParent();
    else 
      Diag(Loc, diag::err_deleted_function_use);
    NoteDeletedFunction(FD);
    return true;
  }

  // If the function has a deduced return type, and we can't deduce it,
  // then we can't use it either.
  if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
      DeduceReturnType(FD, Loc))
    return true;

  if (getLangOpts().CUDA && !CheckCUDACall(Loc, FD))
    return true;
}

auto getReferencedObjCProp = [](const NamedDecl *D) ->
                                    const ObjCPropertyDecl * {
  if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
    return MD->findPropertyDecl();
  return nullptr;
};
if (const ObjCPropertyDecl *ObjCPDecl = getReferencedObjCProp(D)) {
  if (diagnoseArgIndependentDiagnoseIfAttrs(ObjCPDecl, Loc))
    return true;
} else if (diagnoseArgIndependentDiagnoseIfAttrs(D, Loc)) {
    return true;
}

// [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions
// Only the variables omp_in and omp_out are allowed in the combiner.
// Only the variables omp_priv and omp_orig are allowed in the
// initializer-clause.
auto *DRD = dyn_cast<OMPDeclareReductionDecl>(CurContext);
if (LangOpts.OpenMP && DRD && !CurContext->containsDecl(D) &&
    isa<VarDecl>(D)) {
  Diag(Loc, diag::err_omp_wrong_var_in_declare_reduction)
      << getCurFunction()->HasOMPDeclareReductionCombiner;
  Diag(D->getLocation(), diag::note_entity_declared_at) << D;
  return true;
}

DiagnoseAvailabilityOfDecl(D, Locs, UnknownObjCClass, ObjCPropertyAccess,
                           AvoidPartialAvailabilityChecks);

DiagnoseUnusedOfDecl(*this, D, Loc);

diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc);

return false;
300}

302/// \brief Retrieve the message suffix that should be added to a
303/// diagnostic complaining about the given function being deleted or
304/// unavailable.
305std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
std::string Message;
if (FD->getAvailability(&Message))
  return ": " + Message;

return std::string();
311}

313/// DiagnoseSentinelCalls - This routine checks whether a call or
314/// message-send is to a declaration with the sentinel attribute, and
315/// if so, it checks that the requirements of the sentinel are
316/// satisfied.
317void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
                               ArrayRef<Expr *> Args) {
const SentinelAttr *attr = D->getAttr<SentinelAttr>();
if (!attr)
  return;

// The number of formal parameters of the declaration.
unsigned numFormalParams;

// The kind of declaration.  This is also an index into a %select in
// the diagnostic.
enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;

if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
  numFormalParams = MD->param_size();
  calleeType = CT_Method;
} else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
  numFormalParams = FD->param_size();
  calleeType = CT_Function;
} else if (isa<VarDecl>(D)) {
  QualType type = cast<ValueDecl>(D)->getType();
  const FunctionType *fn = nullptr;
  if (const PointerType *ptr = type->getAs<PointerType>()) {
    fn = ptr->getPointeeType()->getAs<FunctionType>();
    if (!fn) return;
    calleeType = CT_Function;
  } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
    fn = ptr->getPointeeType()->castAs<FunctionType>();
    calleeType = CT_Block;
  } else {
    return;
  }

  if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
    numFormalParams = proto->getNumParams();
  } else {
    numFormalParams = 0;
  }
} else {
  return;
}

// "nullPos" is the number of formal parameters at the end which
// effectively count as part of the variadic arguments.  This is
// useful if you would prefer to not have *any* formal parameters,
// but the language forces you to have at least one.
unsigned nullPos = attr->getNullPos();
assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel")(static_cast <bool> ((nullPos == 0 || nullPos == 1) &&
 "invalid null position on sentinel") ? void (0) : __assert_fail
 ("(nullPos == 0 || nullPos == 1) && \"invalid null position on sentinel\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 364, __extension__ __PRETTY_FUNCTION__));
numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);

// The number of arguments which should follow the sentinel.
unsigned numArgsAfterSentinel = attr->getSentinel();

// If there aren't enough arguments for all the formal parameters,
// the sentinel, and the args after the sentinel, complain.
if (Args.size() < numFormalParams + numArgsAfterSentinel + 1) {
  Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
  Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
  return;
}

// Otherwise, find the sentinel expression.
Expr *sentinelExpr = Args[Args.size() - numArgsAfterSentinel - 1];
if (!sentinelExpr) return;
if (sentinelExpr->isValueDependent()) return;
if (Context.isSentinelNullExpr(sentinelExpr)) return;

// Pick a reasonable string to insert.  Optimistically use 'nil', 'nullptr',
// or 'NULL' if those are actually defined in the context.  Only use
// 'nil' for ObjC methods, where it's much more likely that the
// variadic arguments form a list of object pointers.
SourceLocation MissingNilLoc
  = getLocForEndOfToken(sentinelExpr->getLocEnd());
std::string NullValue;
if (calleeType == CT_Method && PP.isMacroDefined("nil"))
  NullValue = "nil";
else if (getLangOpts().CPlusPlus11)
  NullValue = "nullptr";
else if (PP.isMacroDefined("NULL"))
  NullValue = "NULL";
else
  NullValue = "(void*) 0";

if (MissingNilLoc.isInvalid())
  Diag(Loc, diag::warn_missing_sentinel) << int(calleeType);
else
  Diag(MissingNilLoc, diag::warn_missing_sentinel) 
    << int(calleeType)
    << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
407}

409SourceRange Sema::getExprRange(Expr *E) const {
return E ? E->getSourceRange() : SourceRange();
411}

413//===----------------------------------------------------------------------===//
414//  Standard Promotions and Conversions
415//===----------------------------------------------------------------------===//

417/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
418ExprResult Sema::DefaultFunctionArrayConversion(Expr *E, bool Diagnose) {
// Handle any placeholder expressions which made it here.
if (E->getType()->isPlaceholderType()) {
  ExprResult result = CheckPlaceholderExpr(E);
  if (result.isInvalid()) return ExprError();
  E = result.get();
}

QualType Ty = E->getType();
assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type")(static_cast <bool> (!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"
) ? void (0) : __assert_fail ("!Ty.isNull() && \"DefaultFunctionArrayConversion - missing type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 427, __extension__ __PRETTY_FUNCTION__));

if (Ty->isFunctionType()) {
  if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()))
    if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl()))
      if (!checkAddressOfFunctionIsAvailable(FD, Diagnose, E->getExprLoc()))
        return ExprError();

  E = ImpCastExprToType(E, Context.getPointerType(Ty),
                        CK_FunctionToPointerDecay).get();
} else if (Ty->isArrayType()) {
  // In C90 mode, arrays only promote to pointers if the array expression is
  // an lvalue.  The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
  // type 'array of type' is converted to an expression that has type 'pointer
  // to type'...".  In C99 this was changed to: C99 6.3.2.1p3: "an expression
  // that has type 'array of type' ...".  The relevant change is "an lvalue"
  // (C90) to "an expression" (C99).
  //
  // C++ 4.2p1:
  // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
  // T" can be converted to an rvalue of type "pointer to T".
  //
  if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue())
    E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
                          CK_ArrayToPointerDecay).get();
}
return E;
454}

456static void CheckForNullPointerDereference(Sema &S, Expr *E) {
// Check to see if we are dereferencing a null pointer.  If so,
// and if not volatile-qualified, this is undefined behavior that the
// optimizer will delete, so warn about it.  People sometimes try to use this
// to get a deterministic trap and are surprised by clang's behavior.  This
// only handles the pattern "*null", which is a very syntactic check.
if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
  if (UO->getOpcode() == UO_Deref &&
      UO->getSubExpr()->IgnoreParenCasts()->
        isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
      !UO->getType().isVolatileQualified()) {
  S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
                        S.PDiag(diag::warn_indirection_through_null)
                          << UO->getSubExpr()->getSourceRange());
  S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
                      S.PDiag(diag::note_indirection_through_null));
}
473}

475static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE,
                                  SourceLocation AssignLoc,
                                  const Expr* RHS) {
const ObjCIvarDecl *IV = OIRE->getDecl();
if (!IV)
  return;

DeclarationName MemberName = IV->getDeclName();
IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
if (!Member || !Member->isStr("isa"))
  return;

const Expr *Base = OIRE->getBase();
QualType BaseType = Base->getType();
if (OIRE->isArrow())
  BaseType = BaseType->getPointeeType();
if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>())
  if (ObjCInterfaceDecl *IDecl = OTy->getInterface()) {
    ObjCInterfaceDecl *ClassDeclared = nullptr;
    ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
    if (!ClassDeclared->getSuperClass()
        && (*ClassDeclared->ivar_begin()) == IV) {
      if (RHS) {
        NamedDecl *ObjectSetClass =
          S.LookupSingleName(S.TUScope,
                             &S.Context.Idents.get("object_setClass"),
                             SourceLocation(), S.LookupOrdinaryName);
        if (ObjectSetClass) {
          SourceLocation RHSLocEnd = S.getLocForEndOfToken(RHS->getLocEnd());
          S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_assign) <<
          FixItHint::CreateInsertion(OIRE->getLocStart(), "object_setClass(") <<
          FixItHint::CreateReplacement(SourceRange(OIRE->getOpLoc(),
                                                   AssignLoc), ",") <<
          FixItHint::CreateInsertion(RHSLocEnd, ")");
        }
        else
          S.Diag(OIRE->getLocation(), diag::warn_objc_isa_assign);
      } else {
        NamedDecl *ObjectGetClass =
          S.LookupSingleName(S.TUScope,
                             &S.Context.Idents.get("object_getClass"),
                             SourceLocation(), S.LookupOrdinaryName);
        if (ObjectGetClass)
          S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_use) <<
          FixItHint::CreateInsertion(OIRE->getLocStart(), "object_getClass(") <<
          FixItHint::CreateReplacement(
                                       SourceRange(OIRE->getOpLoc(),
                                                   OIRE->getLocEnd()), ")");
        else
          S.Diag(OIRE->getLocation(), diag::warn_objc_isa_use);
      }
      S.Diag(IV->getLocation(), diag::note_ivar_decl);
    }
  }
529}

531ExprResult Sema::DefaultLvalueConversion(Expr *E) {
// Handle any placeholder expressions which made it here.
if (E->getType()->isPlaceholderType()) {
  ExprResult result = CheckPlaceholderExpr(E);
  if (result.isInvalid()) return ExprError();
  E = result.get();
}

// C++ [conv.lval]p1:
//   A glvalue of a non-function, non-array type T can be
//   converted to a prvalue.
if (!E->isGLValue()) return E;

QualType T = E->getType();
assert(!T.isNull() && "r-value conversion on typeless expression?")(static_cast <bool> (!T.isNull() && "r-value conversion on typeless expression?"
) ? void (0) : __assert_fail ("!T.isNull() && \"r-value conversion on typeless expression?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 545, __extension__ __PRETTY_FUNCTION__));

// We don't want to throw lvalue-to-rvalue casts on top of
// expressions of certain types in C++.
if (getLangOpts().CPlusPlus &&
    (E->getType() == Context.OverloadTy ||
     T->isDependentType() ||
     T->isRecordType()))
  return E;

// The C standard is actually really unclear on this point, and
// DR106 tells us what the result should be but not why.  It's
// generally best to say that void types just doesn't undergo
// lvalue-to-rvalue at all.  Note that expressions of unqualified
// 'void' type are never l-values, but qualified void can be.
if (T->isVoidType())
  return E;

// OpenCL usually rejects direct accesses to values of 'half' type.
if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
    T->isHalfType()) {
  Diag(E->getExprLoc(), diag::err_opencl_half_load_store)
    << 0 << T;
  return ExprError();
}

CheckForNullPointerDereference(*this, E);
if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(E->IgnoreParenCasts())) {
  NamedDecl *ObjectGetClass = LookupSingleName(TUScope,
                                   &Context.Idents.get("object_getClass"),
                                   SourceLocation(), LookupOrdinaryName);
  if (ObjectGetClass)
    Diag(E->getExprLoc(), diag::warn_objc_isa_use) <<
      FixItHint::CreateInsertion(OISA->getLocStart(), "object_getClass(") <<
      FixItHint::CreateReplacement(
                  SourceRange(OISA->getOpLoc(), OISA->getIsaMemberLoc()), ")");
  else
    Diag(E->getExprLoc(), diag::warn_objc_isa_use);
}
else if (const ObjCIvarRefExpr *OIRE =
          dyn_cast<ObjCIvarRefExpr>(E->IgnoreParenCasts()))
  DiagnoseDirectIsaAccess(*this, OIRE, SourceLocation(), /* Expr*/nullptr);

// C++ [conv.lval]p1:
//   [...] If T is a non-class type, the type of the prvalue is the
//   cv-unqualified version of T. Otherwise, the type of the
//   rvalue is T.
//
// C99 6.3.2.1p2:
//   If the lvalue has qualified type, the value has the unqualified
//   version of the type of the lvalue; otherwise, the value has the
//   type of the lvalue.
if (T.hasQualifiers())
  T = T.getUnqualifiedType();

// Under the MS ABI, lock down the inheritance model now.
if (T->isMemberPointerType() &&
    Context.getTargetInfo().getCXXABI().isMicrosoft())
  (void)isCompleteType(E->getExprLoc(), T);

UpdateMarkingForLValueToRValue(E);

// Loading a __weak object implicitly retains the value, so we need a cleanup to 
// balance that.
if (E->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
  Cleanup.setExprNeedsCleanups(true);

ExprResult Res = ImplicitCastExpr::Create(Context, T, CK_LValueToRValue, E,
                                          nullptr, VK_RValue);

// C11 6.3.2.1p2:
//   ... if the lvalue has atomic type, the value has the non-atomic version 
//   of the type of the lvalue ...
if (const AtomicType *Atomic = T->getAs<AtomicType>()) {
  T = Atomic->getValueType().getUnqualifiedType();
  Res = ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic, Res.get(),
                                 nullptr, VK_RValue);
}

return Res;
625}

627ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose) {
ExprResult Res = DefaultFunctionArrayConversion(E, Diagnose);
if (Res.isInvalid())
  return ExprError();
Res = DefaultLvalueConversion(Res.get());
if (Res.isInvalid())
  return ExprError();
return Res;
635}

637/// CallExprUnaryConversions - a special case of an unary conversion
638/// performed on a function designator of a call expression.
639ExprResult Sema::CallExprUnaryConversions(Expr *E) {
QualType Ty = E->getType();
ExprResult Res = E;
// Only do implicit cast for a function type, but not for a pointer
// to function type.
if (Ty->isFunctionType()) {
  Res = ImpCastExprToType(E, Context.getPointerType(Ty),
                          CK_FunctionToPointerDecay).get();
  if (Res.isInvalid())
    return ExprError();
}
Res = DefaultLvalueConversion(Res.get());
if (Res.isInvalid())
  return ExprError();
return Res.get();
654}

656/// UsualUnaryConversions - Performs various conversions that are common to most
657/// operators (C99 6.3). The conversions of array and function types are
658/// sometimes suppressed. For example, the array->pointer conversion doesn't
659/// apply if the array is an argument to the sizeof or address (&) operators.
660/// In these instances, this routine should *not* be called.
661ExprResult Sema::UsualUnaryConversions(Expr *E) {
// First, convert to an r-value.
ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
if (Res.isInvalid())
  return ExprError();
E = Res.get();

QualType Ty = E->getType();
assert(!Ty.isNull() && "UsualUnaryConversions - missing type")(static_cast <bool> (!Ty.isNull() && "UsualUnaryConversions - missing type"
) ? void (0) : __assert_fail ("!Ty.isNull() && \"UsualUnaryConversions - missing type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 669, __extension__ __PRETTY_FUNCTION__));

// Half FP have to be promoted to float unless it is natively supported
if (Ty->isHalfType() && !getLangOpts().NativeHalfType)
  return ImpCastExprToType(Res.get(), Context.FloatTy, CK_FloatingCast);

// Try to perform integral promotions if the object has a theoretically
// promotable type.
if (Ty->isIntegralOrUnscopedEnumerationType()) {
  // C99 6.3.1.1p2:
  //
  //   The following may be used in an expression wherever an int or
  //   unsigned int may be used:
  //     - an object or expression with an integer type whose integer
  //       conversion rank is less than or equal to the rank of int
  //       and unsigned int.
  //     - A bit-field of type _Bool, int, signed int, or unsigned int.
  //
  //   If an int can represent all values of the original type, the
  //   value is converted to an int; otherwise, it is converted to an
  //   unsigned int. These are called the integer promotions. All
  //   other types are unchanged by the integer promotions.

  QualType PTy = Context.isPromotableBitField(E);
  if (!PTy.isNull()) {
    E = ImpCastExprToType(E, PTy, CK_IntegralCast).get();
    return E;
  }
  if (Ty->isPromotableIntegerType()) {
    QualType PT = Context.getPromotedIntegerType(Ty);
    E = ImpCastExprToType(E, PT, CK_IntegralCast).get();
    return E;
  }
}
return E;
704}

706/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
707/// do not have a prototype. Arguments that have type float or __fp16
708/// are promoted to double. All other argument types are converted by
709/// UsualUnaryConversions().
710ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
QualType Ty = E->getType();
assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type")(static_cast <bool> (!Ty.isNull() && "DefaultArgumentPromotion - missing type"
) ? void (0) : __assert_fail ("!Ty.isNull() && \"DefaultArgumentPromotion - missing type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 712, __extension__ __PRETTY_FUNCTION__));

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

// If this is a 'float'  or '__fp16' (CVR qualified or typedef)
// promote to double.
// Note that default argument promotion applies only to float (and
// half/fp16); it does not apply to _Float16.
const BuiltinType *BTy = Ty->getAs<BuiltinType>();
if (BTy && (BTy->getKind() == BuiltinType::Half ||
            BTy->getKind() == BuiltinType::Float)) {
  if (getLangOpts().OpenCL &&
      !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
      if (BTy->getKind() == BuiltinType::Half) {
          E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get();
      }
  } else {
    E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get();
  }
}

// C++ performs lvalue-to-rvalue conversion as a default argument
// promotion, even on class types, but note:
//   C++11 [conv.lval]p2:
//     When an lvalue-to-rvalue conversion occurs in an unevaluated
//     operand or a subexpression thereof the value contained in the
//     referenced object is not accessed. Otherwise, if the glvalue
//     has a class type, the conversion copy-initializes a temporary
//     of type T from the glvalue and the result of the conversion
//     is a prvalue for the temporary.
// FIXME: add some way to gate this entire thing for correctness in
// potentially potentially evaluated contexts.
if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) {
  ExprResult Temp = PerformCopyInitialization(
                     InitializedEntity::InitializeTemporary(E->getType()),
                                              E->getExprLoc(), E);
  if (Temp.isInvalid())
    return ExprError();
  E = Temp.get();
}

return E;
757}

759/// Determine the degree of POD-ness for an expression.
760/// Incomplete types are considered POD, since this check can be performed
761/// when we're in an unevaluated context.
762Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) {
if (Ty->isIncompleteType()) {
  // C++11 [expr.call]p7:
  //   After these conversions, if the argument does not have arithmetic,
  //   enumeration, pointer, pointer to member, or class type, the program
  //   is ill-formed.
  //
  // Since we've already performed array-to-pointer and function-to-pointer
  // decay, the only such type in C++ is cv void. This also handles
  // initializer lists as variadic arguments.
  if (Ty->isVoidType())
    return VAK_Invalid;

  if (Ty->isObjCObjectType())
    return VAK_Invalid;
  return VAK_Valid;
}

if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
  return VAK_Invalid;

if (Ty.isCXX98PODType(Context))
  return VAK_Valid;

// C++11 [expr.call]p7:
//   Passing a potentially-evaluated argument of class type (Clause 9)
//   having a non-trivial copy constructor, a non-trivial move constructor,
//   or a non-trivial destructor, with no corresponding parameter,
//   is conditionally-supported with implementation-defined semantics.
if (getLangOpts().CPlusPlus11 && !Ty->isDependentType())
  if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl())
    if (!Record->hasNonTrivialCopyConstructor() &&
        !Record->hasNonTrivialMoveConstructor() &&
        !Record->hasNonTrivialDestructor())
      return VAK_ValidInCXX11;

if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType())
  return VAK_Valid;

if (Ty->isObjCObjectType())
  return VAK_Invalid;

if (getLangOpts().MSVCCompat)
  return VAK_MSVCUndefined;

// FIXME: In C++11, these cases are conditionally-supported, meaning we're
// permitted to reject them. We should consider doing so.
return VAK_Undefined;
810}

812void Sema::checkVariadicArgument(const Expr *E, VariadicCallType CT) {
// Don't allow one to pass an Objective-C interface to a vararg.
const QualType &Ty = E->getType();
VarArgKind VAK = isValidVarArgType(Ty);

// Complain about passing non-POD types through varargs.
switch (VAK) {
case VAK_ValidInCXX11:
  DiagRuntimeBehavior(
      E->getLocStart(), nullptr,
      PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg)
        << Ty << CT);
  LLVM_FALLTHROUGH[[clang::fallthrough]];
case VAK_Valid:
  if (Ty->isRecordType()) {
    // This is unlikely to be what the user intended. If the class has a
    // 'c_str' member function, the user probably meant to call that.
    DiagRuntimeBehavior(E->getLocStart(), nullptr,
                        PDiag(diag::warn_pass_class_arg_to_vararg)
                          << Ty << CT << hasCStrMethod(E) << ".c_str()");
  }
  break;

case VAK_Undefined:
case VAK_MSVCUndefined:
  DiagRuntimeBehavior(
      E->getLocStart(), nullptr,
      PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
        << getLangOpts().CPlusPlus11 << Ty << CT);
  break;

case VAK_Invalid:
  if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
    Diag(E->getLocStart(),
         diag::err_cannot_pass_non_trivial_c_struct_to_vararg) << Ty << CT;
  else if (Ty->isObjCObjectType())
    DiagRuntimeBehavior(
        E->getLocStart(), nullptr,
        PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
          << Ty << CT);
  else
    Diag(E->getLocStart(), diag::err_cannot_pass_to_vararg)
      << isa<InitListExpr>(E) << Ty << CT;
  break;
}
857}

859/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
860/// will create a trap if the resulting type is not a POD type.
861ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
                                                FunctionDecl *FDecl) {
if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
  // Strip the unbridged-cast placeholder expression off, if applicable.
  if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
      (CT == VariadicMethod ||
       (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
    E = stripARCUnbridgedCast(E);

  // Otherwise, do normal placeholder checking.
  } else {
    ExprResult ExprRes = CheckPlaceholderExpr(E);
    if (ExprRes.isInvalid())
      return ExprError();
    E = ExprRes.get();
  }
}

ExprResult ExprRes = DefaultArgumentPromotion(E);
if (ExprRes.isInvalid())
  return ExprError();
E = ExprRes.get();

// Diagnostics regarding non-POD argument types are
// emitted along with format string checking in Sema::CheckFunctionCall().
if (isValidVarArgType(E->getType()) == VAK_Undefined) {
  // Turn this into a trap.
  CXXScopeSpec SS;
  SourceLocation TemplateKWLoc;
  UnqualifiedId Name;
  Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
                     E->getLocStart());
  ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc,
                                        Name, true, false);
  if (TrapFn.isInvalid())
    return ExprError();

  ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(),
                                  E->getLocStart(), None,
                                  E->getLocEnd());
  if (Call.isInvalid())
    return ExprError();

  ExprResult Comma = ActOnBinOp(TUScope, E->getLocStart(), tok::comma,
                                Call.get(), E);
  if (Comma.isInvalid())
    return ExprError();
  return Comma.get();
}

if (!getLangOpts().CPlusPlus &&
    RequireCompleteType(E->getExprLoc(), E->getType(),
                        diag::err_call_incomplete_argument))
  return ExprError();

return E;
917}

919/// \brief Converts an integer to complex float type.  Helper function of
920/// UsualArithmeticConversions()
921///
922/// \return false if the integer expression is an integer type and is
923/// successfully converted to the complex type.
924static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
                                                ExprResult &ComplexExpr,
                                                QualType IntTy,
                                                QualType ComplexTy,
                                                bool SkipCast) {
if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
if (SkipCast) return false;
if (IntTy->isIntegerType()) {
  QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
  IntExpr = S.ImpCastExprToType(IntExpr.get(), fpTy, CK_IntegralToFloating);
  IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
                                CK_FloatingRealToComplex);
} else {
  assert(IntTy->isComplexIntegerType())(static_cast <bool> (IntTy->isComplexIntegerType()) ?
 void (0) : __assert_fail ("IntTy->isComplexIntegerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 937, __extension__ __PRETTY_FUNCTION__));
  IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
                                CK_IntegralComplexToFloatingComplex);
}
return false;
942}

944/// \brief Handle arithmetic conversion with complex types.  Helper function of
945/// UsualArithmeticConversions()
946static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
                                           ExprResult &RHS, QualType LHSType,
                                           QualType RHSType,
                                           bool IsCompAssign) {
// if we have an integer operand, the result is the complex type.
if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
                                           /*skipCast*/false))
  return LHSType;
if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
                                           /*skipCast*/IsCompAssign))
  return RHSType;

// This handles complex/complex, complex/float, or float/complex.
// When both operands are complex, the shorter operand is converted to the
// type of the longer, and that is the type of the result. This corresponds
// to what is done when combining two real floating-point operands.
// The fun begins when size promotion occur across type domains.
// From H&S 6.3.4: When one operand is complex and the other is a real
// floating-point type, the less precise type is converted, within it's
// real or complex domain, to the precision of the other type. For example,
// when combining a "long double" with a "double _Complex", the
// "double _Complex" is promoted to "long double _Complex".

// Compute the rank of the two types, regardless of whether they are complex.
int Order = S.Context.getFloatingTypeOrder(LHSType, RHSType);

auto *LHSComplexType = dyn_cast<ComplexType>(LHSType);
auto *RHSComplexType = dyn_cast<ComplexType>(RHSType);
QualType LHSElementType =
    LHSComplexType ? LHSComplexType->getElementType() : LHSType;
QualType RHSElementType =
    RHSComplexType ? RHSComplexType->getElementType() : RHSType;

QualType ResultType = S.Context.getComplexType(LHSElementType);
if (Order < 0) {
  // Promote the precision of the LHS if not an assignment.
  ResultType = S.Context.getComplexType(RHSElementType);
  if (!IsCompAssign) {
    if (LHSComplexType)
      LHS =
          S.ImpCastExprToType(LHS.get(), ResultType, CK_FloatingComplexCast);
    else
      LHS = S.ImpCastExprToType(LHS.get(), RHSElementType, CK_FloatingCast);
  }
} else if (Order > 0) {
  // Promote the precision of the RHS.
  if (RHSComplexType)
    RHS = S.ImpCastExprToType(RHS.get(), ResultType, CK_FloatingComplexCast);
  else
    RHS = S.ImpCastExprToType(RHS.get(), LHSElementType, CK_FloatingCast);
}
return ResultType;
998}

1000/// \brief Handle arithmetic conversion from integer to float.  Helper function
1001/// of UsualArithmeticConversions()
1002static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
                                         ExprResult &IntExpr,
                                         QualType FloatTy, QualType IntTy,
                                         bool ConvertFloat, bool ConvertInt) {
if (IntTy->isIntegerType()) {
  if (ConvertInt)
    // Convert intExpr to the lhs floating point type.
    IntExpr = S.ImpCastExprToType(IntExpr.get(), FloatTy,
                                  CK_IntegralToFloating);
  return FloatTy;
}
   
// Convert both sides to the appropriate complex float.
assert(IntTy->isComplexIntegerType())(static_cast <bool> (IntTy->isComplexIntegerType()) ?
 void (0) : __assert_fail ("IntTy->isComplexIntegerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1015, __extension__ __PRETTY_FUNCTION__));
QualType result = S.Context.getComplexType(FloatTy);

// _Complex int -> _Complex float
if (ConvertInt)
  IntExpr = S.ImpCastExprToType(IntExpr.get(), result,
                                CK_IntegralComplexToFloatingComplex);

// float -> _Complex float
if (ConvertFloat)
  FloatExpr = S.ImpCastExprToType(FloatExpr.get(), result,
                                  CK_FloatingRealToComplex);

return result;
1029}

1031/// \brief Handle arithmethic conversion with floating point types.  Helper
1032/// function of UsualArithmeticConversions()
1033static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
                                    ExprResult &RHS, QualType LHSType,
                                    QualType RHSType, bool IsCompAssign) {
bool LHSFloat = LHSType->isRealFloatingType();
bool RHSFloat = RHSType->isRealFloatingType();

// If we have two real floating types, convert the smaller operand
// to the bigger result.
if (LHSFloat && RHSFloat) {
  int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
  if (order > 0) {
    RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FloatingCast);
    return LHSType;
  }

  assert(order < 0 && "illegal float comparison")(static_cast <bool> (order < 0 && "illegal float comparison"
) ? void (0) : __assert_fail ("order < 0 && \"illegal float comparison\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1048, __extension__ __PRETTY_FUNCTION__));
  if (!IsCompAssign)
    LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FloatingCast);
  return RHSType;
}

if (LHSFloat) {
  // Half FP has to be promoted to float unless it is natively supported
  if (LHSType->isHalfType() && !S.getLangOpts().NativeHalfType)
    LHSType = S.Context.FloatTy;

  return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
                                    /*convertFloat=*/!IsCompAssign,
                                    /*convertInt=*/ true);
}
assert(RHSFloat)(static_cast <bool> (RHSFloat) ? void (0) : __assert_fail
 ("RHSFloat", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1063, __extension__ __PRETTY_FUNCTION__));
return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
                                  /*convertInt=*/ true,
                                  /*convertFloat=*/!IsCompAssign);
1067}

1069/// \brief Diagnose attempts to convert between __float128 and long double if
1070/// there is no support for such conversion. Helper function of
1071/// UsualArithmeticConversions().
1072static bool unsupportedTypeConversion(const Sema &S, QualType LHSType,
                                    QualType RHSType) {
/*  No issue converting if at least one of the types is not a floating point
    type or the two types have the same rank.
*/
if (!LHSType->isFloatingType() || !RHSType->isFloatingType() ||
    S.Context.getFloatingTypeOrder(LHSType, RHSType) == 0)
  return false;

assert(LHSType->isFloatingType() && RHSType->isFloatingType() &&(static_cast <bool> (LHSType->isFloatingType() &&
 RHSType->isFloatingType() && "The remaining types must be floating point types."
) ? void (0) : __assert_fail ("LHSType->isFloatingType() && RHSType->isFloatingType() && \"The remaining types must be floating point types.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1082, __extension__ __PRETTY_FUNCTION__))
       "The remaining types must be floating point types.")(static_cast <bool> (LHSType->isFloatingType() &&
 RHSType->isFloatingType() && "The remaining types must be floating point types."
) ? void (0) : __assert_fail ("LHSType->isFloatingType() && RHSType->isFloatingType() && \"The remaining types must be floating point types.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1082, __extension__ __PRETTY_FUNCTION__));

auto *LHSComplex = LHSType->getAs<ComplexType>();
auto *RHSComplex = RHSType->getAs<ComplexType>();

QualType LHSElemType = LHSComplex ?
  LHSComplex->getElementType() : LHSType;
QualType RHSElemType = RHSComplex ?
  RHSComplex->getElementType() : RHSType;

// No issue if the two types have the same representation
if (&S.Context.getFloatTypeSemantics(LHSElemType) ==
    &S.Context.getFloatTypeSemantics(RHSElemType))
  return false;

bool Float128AndLongDouble = (LHSElemType == S.Context.Float128Ty &&
                              RHSElemType == S.Context.LongDoubleTy);
Float128AndLongDouble |= (LHSElemType == S.Context.LongDoubleTy &&
                          RHSElemType == S.Context.Float128Ty);

// We've handled the situation where __float128 and long double have the same
// representation. We allow all conversions for all possible long double types
// except PPC's double double.
return Float128AndLongDouble &&
  (&S.Context.getFloatTypeSemantics(S.Context.LongDoubleTy) ==
   &llvm::APFloat::PPCDoubleDouble());
1108}

1110typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType);

1112namespace {
1113/// These helper callbacks are placed in an anonymous namespace to
1114/// permit their use as function template parameters.
1115ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) {
return S.ImpCastExprToType(op, toType, CK_IntegralCast);
1117}

1119ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) {
return S.ImpCastExprToType(op, S.Context.getComplexType(toType),
                           CK_IntegralComplexCast);
1122}
1123}

1125/// \brief Handle integer arithmetic conversions.  Helper function of
1126/// UsualArithmeticConversions()
1127template <PerformCastFn doLHSCast, PerformCastFn doRHSCast>
1128static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
                                      ExprResult &RHS, QualType LHSType,
                                      QualType RHSType, bool IsCompAssign) {
// The rules for this case are in C99 6.3.1.8
int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
if (LHSSigned == RHSSigned) {
  // Same signedness; use the higher-ranked type
  if (order >= 0) {
    RHS = (*doRHSCast)(S, RHS.get(), LHSType);
    return LHSType;
  } else if (!IsCompAssign)
    LHS = (*doLHSCast)(S, LHS.get(), RHSType);
  return RHSType;
} else if (order != (LHSSigned ? 1 : -1)) {
  // The unsigned type has greater than or equal rank to the
  // signed type, so use the unsigned type
  if (RHSSigned) {
    RHS = (*doRHSCast)(S, RHS.get(), LHSType);
    return LHSType;
  } else if (!IsCompAssign)
    LHS = (*doLHSCast)(S, LHS.get(), RHSType);
  return RHSType;
} else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
  // The two types are different widths; if we are here, that
  // means the signed type is larger than the unsigned type, so
  // use the signed type.
  if (LHSSigned) {
    RHS = (*doRHSCast)(S, RHS.get(), LHSType);
    return LHSType;
  } else if (!IsCompAssign)
    LHS = (*doLHSCast)(S, LHS.get(), RHSType);
  return RHSType;
} else {
  // The signed type is higher-ranked than the unsigned type,
  // but isn't actually any bigger (like unsigned int and long
  // on most 32-bit systems).  Use the unsigned type corresponding
  // to the signed type.
  QualType result =
    S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
  RHS = (*doRHSCast)(S, RHS.get(), result);
  if (!IsCompAssign)
    LHS = (*doLHSCast)(S, LHS.get(), result);
  return result;
}
1174}

1176/// \brief Handle conversions with GCC complex int extension.  Helper function
1177/// of UsualArithmeticConversions()
1178static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
                                         ExprResult &RHS, QualType LHSType,
                                         QualType RHSType,
                                         bool IsCompAssign) {
const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();

if (LHSComplexInt && RHSComplexInt) {
  QualType LHSEltType = LHSComplexInt->getElementType();
  QualType RHSEltType = RHSComplexInt->getElementType();
  QualType ScalarType =
    handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast>
      (S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign);

  return S.Context.getComplexType(ScalarType);
}

if (LHSComplexInt) {
  QualType LHSEltType = LHSComplexInt->getElementType();
  QualType ScalarType =
    handleIntegerConversion<doComplexIntegralCast, doIntegralCast>
      (S, LHS, RHS, LHSEltType, RHSType, IsCompAssign);
  QualType ComplexType = S.Context.getComplexType(ScalarType);
  RHS = S.ImpCastExprToType(RHS.get(), ComplexType,
                            CK_IntegralRealToComplex);

  return ComplexType;
}

assert(RHSComplexInt)(static_cast <bool> (RHSComplexInt) ? void (0) : __assert_fail
 ("RHSComplexInt", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1207, __extension__ __PRETTY_FUNCTION__));

QualType RHSEltType = RHSComplexInt->getElementType();
QualType ScalarType =
  handleIntegerConversion<doIntegralCast, doComplexIntegralCast>
    (S, LHS, RHS, LHSType, RHSEltType, IsCompAssign);
QualType ComplexType = S.Context.getComplexType(ScalarType);

if (!IsCompAssign)
  LHS = S.ImpCastExprToType(LHS.get(), ComplexType,
                            CK_IntegralRealToComplex);
return ComplexType;
1219}

1221/// UsualArithmeticConversions - Performs various conversions that are common to
1222/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
1223/// routine returns the first non-arithmetic type found. The client is
1224/// responsible for emitting appropriate error diagnostics.
1225QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
                                        bool IsCompAssign) {
if (!IsCompAssign) {
  LHS = UsualUnaryConversions(LHS.get());
  if (LHS.isInvalid())
    return QualType();
}

RHS = UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
  return QualType();

// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType =
  Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
QualType RHSType =
  Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();

// For conversion purposes, we ignore any atomic qualifier on the LHS.
if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>())
  LHSType = AtomicLHS->getValueType();

// If both types are identical, no conversion is needed.
if (LHSType == RHSType)
  return LHSType;

// If either side is a non-arithmetic type (e.g. a pointer), we are done.
// The caller can deal with this (e.g. pointer + int).
if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
  return QualType();

// Apply unary and bitfield promotions to the LHS's type.
QualType LHSUnpromotedType = LHSType;
if (LHSType->isPromotableIntegerType())
  LHSType = Context.getPromotedIntegerType(LHSType);
QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
if (!LHSBitfieldPromoteTy.isNull())
  LHSType = LHSBitfieldPromoteTy;
if (LHSType != LHSUnpromotedType && !IsCompAssign)
  LHS = ImpCastExprToType(LHS.get(), LHSType, CK_IntegralCast);

// If both types are identical, no conversion is needed.
if (LHSType == RHSType)
  return LHSType;

// At this point, we have two different arithmetic types.

// Diagnose attempts to convert between __float128 and long double where
// such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSType, RHSType))
  return QualType();

// Handle complex types first (C99 6.3.1.8p1).
if (LHSType->isComplexType() || RHSType->isComplexType())
  return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
                                      IsCompAssign);

// Now handle "real" floating types (i.e. float, double, long double).
if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
  return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
                               IsCompAssign);

// Handle GCC complex int extension.
if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
  return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
                                    IsCompAssign);

// Finally, we have two differing integer types.
return handleIntegerConversion<doIntegralCast, doIntegralCast>
         (*this, LHS, RHS, LHSType, RHSType, IsCompAssign);
1296}


1299//===----------------------------------------------------------------------===//
1300//  Semantic Analysis for various Expression Types
1301//===----------------------------------------------------------------------===//


1304ExprResult
1305Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
                              SourceLocation DefaultLoc,
                              SourceLocation RParenLoc,
                              Expr *ControllingExpr,
                              ArrayRef<ParsedType> ArgTypes,
                              ArrayRef<Expr *> ArgExprs) {
unsigned NumAssocs = ArgTypes.size();
assert(NumAssocs == ArgExprs.size())(static_cast <bool> (NumAssocs == ArgExprs.size()) ? void
 (0) : __assert_fail ("NumAssocs == ArgExprs.size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1312, __extension__ __PRETTY_FUNCTION__));

TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
for (unsigned i = 0; i < NumAssocs; ++i) {
  if (ArgTypes[i])
    (void) GetTypeFromParser(ArgTypes[i], &Types[i]);
  else
    Types[i] = nullptr;
}

ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
                                           ControllingExpr,
                                           llvm::makeArrayRef(Types, NumAssocs),
                                           ArgExprs);
delete [] Types;
return ER;
1328}

1330ExprResult
1331Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
                               SourceLocation DefaultLoc,
                               SourceLocation RParenLoc,
                               Expr *ControllingExpr,
                               ArrayRef<TypeSourceInfo *> Types,
                               ArrayRef<Expr *> Exprs) {
unsigned NumAssocs = Types.size();
assert(NumAssocs == Exprs.size())(static_cast <bool> (NumAssocs == Exprs.size()) ? void (
0) : __assert_fail ("NumAssocs == Exprs.size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1338, __extension__ __PRETTY_FUNCTION__));

// Decay and strip qualifiers for the controlling expression type, and handle
// placeholder type replacement. See committee discussion from WG14 DR423.
{
  EnterExpressionEvaluationContext Unevaluated(
      *this, Sema::ExpressionEvaluationContext::Unevaluated);
  ExprResult R = DefaultFunctionArrayLvalueConversion(ControllingExpr);
  if (R.isInvalid())
    return ExprError();
  ControllingExpr = R.get();
}

// The controlling expression is an unevaluated operand, so side effects are
// likely unintended.
if (!inTemplateInstantiation() &&
    ControllingExpr->HasSideEffects(Context, false))
  Diag(ControllingExpr->getExprLoc(),
       diag::warn_side_effects_unevaluated_context);

bool TypeErrorFound = false,
     IsResultDependent = ControllingExpr->isTypeDependent(),
     ContainsUnexpandedParameterPack
       = ControllingExpr->containsUnexpandedParameterPack();

for (unsigned i = 0; i < NumAssocs; ++i) {
  if (Exprs[i]->containsUnexpandedParameterPack())
    ContainsUnexpandedParameterPack = true;

  if (Types[i]) {
    if (Types[i]->getType()->containsUnexpandedParameterPack())
      ContainsUnexpandedParameterPack = true;

    if (Types[i]->getType()->isDependentType()) {
      IsResultDependent = true;
    } else {
      // C11 6.5.1.1p2 "The type name in a generic association shall specify a
      // complete object type other than a variably modified type."
      unsigned D = 0;
      if (Types[i]->getType()->isIncompleteType())
        D = diag::err_assoc_type_incomplete;
      else if (!Types[i]->getType()->isObjectType())
        D = diag::err_assoc_type_nonobject;
      else if (Types[i]->getType()->isVariablyModifiedType())
        D = diag::err_assoc_type_variably_modified;

      if (D != 0) {
        Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
          << Types[i]->getTypeLoc().getSourceRange()
          << Types[i]->getType();
        TypeErrorFound = true;
      }

      // C11 6.5.1.1p2 "No two generic associations in the same generic
      // selection shall specify compatible types."
      for (unsigned j = i+1; j < NumAssocs; ++j)
        if (Types[j] && !Types[j]->getType()->isDependentType() &&
            Context.typesAreCompatible(Types[i]->getType(),
                                       Types[j]->getType())) {
          Diag(Types[j]->getTypeLoc().getBeginLoc(),
               diag::err_assoc_compatible_types)
            << Types[j]->getTypeLoc().getSourceRange()
            << Types[j]->getType()
            << Types[i]->getType();
          Diag(Types[i]->getTypeLoc().getBeginLoc(),
               diag::note_compat_assoc)
            << Types[i]->getTypeLoc().getSourceRange()
            << Types[i]->getType();
          TypeErrorFound = true;
        }
    }
  }
}
if (TypeErrorFound)
  return ExprError();

// If we determined that the generic selection is result-dependent, don't
// try to compute the result expression.
if (IsResultDependent)
  return new (Context) GenericSelectionExpr(
      Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
      ContainsUnexpandedParameterPack);

SmallVector<unsigned, 1> CompatIndices;
unsigned DefaultIndex = -1U;
for (unsigned i = 0; i < NumAssocs; ++i) {
  if (!Types[i])
    DefaultIndex = i;
  else if (Context.typesAreCompatible(ControllingExpr->getType(),
                                      Types[i]->getType()))
    CompatIndices.push_back(i);
}

// C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
// type compatible with at most one of the types named in its generic
// association list."
if (CompatIndices.size() > 1) {
  // We strip parens here because the controlling expression is typically
  // parenthesized in macro definitions.
  ControllingExpr = ControllingExpr->IgnoreParens();
  Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_multi_match)
    << ControllingExpr->getSourceRange() << ControllingExpr->getType()
    << (unsigned) CompatIndices.size();
  for (unsigned I : CompatIndices) {
    Diag(Types[I]->getTypeLoc().getBeginLoc(),
         diag::note_compat_assoc)
      << Types[I]->getTypeLoc().getSourceRange()
      << Types[I]->getType();
  }
  return ExprError();
}

// C11 6.5.1.1p2 "If a generic selection has no default generic association,
// its controlling expression shall have type compatible with exactly one of
// the types named in its generic association list."
if (DefaultIndex == -1U && CompatIndices.size() == 0) {
  // We strip parens here because the controlling expression is typically
  // parenthesized in macro definitions.
  ControllingExpr = ControllingExpr->IgnoreParens();
  Diag(ControllingExpr->getLocStart(), diag::err_generic_sel_no_match)
    << ControllingExpr->getSourceRange() << ControllingExpr->getType();
  return ExprError();
}

// C11 6.5.1.1p3 "If a generic selection has a generic association with a
// type name that is compatible with the type of the controlling expression,
// then the result expression of the generic selection is the expression
// in that generic association. Otherwise, the result expression of the
// generic selection is the expression in the default generic association."
unsigned ResultIndex =
  CompatIndices.size() ? CompatIndices[0] : DefaultIndex;

return new (Context) GenericSelectionExpr(
    Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
    ContainsUnexpandedParameterPack, ResultIndex);
1473}

1475/// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the
1476/// location of the token and the offset of the ud-suffix within it.
1477static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc,
                                   unsigned Offset) {
return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(),
                                      S.getLangOpts());
1481}

1483/// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up
1484/// the corresponding cooked (non-raw) literal operator, and build a call to it.
1485static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope,
                                               IdentifierInfo *UDSuffix,
                                               SourceLocation UDSuffixLoc,
                                               ArrayRef<Expr*> Args,
                                               SourceLocation LitEndLoc) {
assert(Args.size() <= 2 && "too many arguments for literal operator")(static_cast <bool> (Args.size() <= 2 && "too many arguments for literal operator"
) ? void (0) : __assert_fail ("Args.size() <= 2 && \"too many arguments for literal operator\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1490, __extension__ __PRETTY_FUNCTION__));

QualType ArgTy[2];
for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) {
  ArgTy[ArgIdx] = Args[ArgIdx]->getType();
  if (ArgTy[ArgIdx]->isArrayType())
    ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]);
}

DeclarationName OpName =
  S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);

LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName);
if (S.LookupLiteralOperator(Scope, R, llvm::makeArrayRef(ArgTy, Args.size()),
                            /*AllowRaw*/ false, /*AllowTemplate*/ false,
                            /*AllowStringTemplate*/ false,
                            /*DiagnoseMissing*/ true) == Sema::LOLR_Error)
  return ExprError();

return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc);
1512}

1514/// ActOnStringLiteral - The specified tokens were lexed as pasted string
1515/// fragments (e.g. "foo" "bar" L"baz").  The result string has to handle string
1516/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1517/// multiple tokens.  However, the common case is that StringToks points to one
1518/// string.
1519///
1520ExprResult
1521Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) {
assert(!StringToks.empty() && "Must have at least one string!")(static_cast <bool> (!StringToks.empty() && "Must have at least one string!"
) ? void (0) : __assert_fail ("!StringToks.empty() && \"Must have at least one string!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1522, __extension__ __PRETTY_FUNCTION__));

StringLiteralParser Literal(StringToks, PP);
if (Literal.hadError)
  return ExprError();

SmallVector<SourceLocation, 4> StringTokLocs;
for (const Token &Tok : StringToks)
  StringTokLocs.push_back(Tok.getLocation());

QualType CharTy = Context.CharTy;
StringLiteral::StringKind Kind = StringLiteral::Ascii;
if (Literal.isWide()) {
  CharTy = Context.getWideCharType();
  Kind = StringLiteral::Wide;
} else if (Literal.isUTF8()) {
  Kind = StringLiteral::UTF8;
} else if (Literal.isUTF16()) {
  CharTy = Context.Char16Ty;
  Kind = StringLiteral::UTF16;
} else if (Literal.isUTF32()) {
  CharTy = Context.Char32Ty;
  Kind = StringLiteral::UTF32;
} else if (Literal.isPascal()) {
  CharTy = Context.UnsignedCharTy;
}

QualType CharTyConst = CharTy;
// A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
  CharTyConst.addConst();

// Get an array type for the string, according to C99 6.4.5.  This includes
// the nul terminator character as well as the string length for pascal
// strings.
QualType StrTy = Context.getConstantArrayType(CharTyConst,
                               llvm::APInt(32, Literal.GetNumStringChars()+1),
                               ArrayType::Normal, 0);

// OpenCL v1.1 s6.5.3: a string literal is in the constant address space.
if (getLangOpts().OpenCL) {
  StrTy = Context.getAddrSpaceQualType(StrTy, LangAS::opencl_constant);
}

// Pass &StringTokLocs[0], StringTokLocs.size() to factory!
StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
                                           Kind, Literal.Pascal, StrTy,
                                           &StringTokLocs[0],
                                           StringTokLocs.size());
if (Literal.getUDSuffix().empty())
  return Lit;

// We're building a user-defined literal.
IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
SourceLocation UDSuffixLoc =
  getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
                 Literal.getUDSuffixOffset());

// Make sure we're allowed user-defined literals here.
if (!UDLScope)
  return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));

// C++11 [lex.ext]p5: The literal L is treated as a call of the form
//   operator "" X (str, len)
QualType SizeType = Context.getSizeType();

DeclarationName OpName =
  Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);

QualType ArgTy[] = {
  Context.getArrayDecayedType(StrTy), SizeType
};

LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
switch (LookupLiteralOperator(UDLScope, R, ArgTy,
                              /*AllowRaw*/ false, /*AllowTemplate*/ false,
                              /*AllowStringTemplate*/ true,
                              /*DiagnoseMissing*/ true)) {

case LOLR_Cooked: {
  llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars());
  IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType,
                                                  StringTokLocs[0]);
  Expr *Args[] = { Lit, LenArg };

  return BuildLiteralOperatorCall(R, OpNameInfo, Args, StringTokLocs.back());
}

case LOLR_StringTemplate: {
  TemplateArgumentListInfo ExplicitArgs;

  unsigned CharBits = Context.getIntWidth(CharTy);
  bool CharIsUnsigned = CharTy->isUnsignedIntegerType();
  llvm::APSInt Value(CharBits, CharIsUnsigned);

  TemplateArgument TypeArg(CharTy);
  TemplateArgumentLocInfo TypeArgInfo(Context.getTrivialTypeSourceInfo(CharTy));
  ExplicitArgs.addArgument(TemplateArgumentLoc(TypeArg, TypeArgInfo));

  for (unsigned I = 0, N = Lit->getLength(); I != N; ++I) {
    Value = Lit->getCodeUnit(I);
    TemplateArgument Arg(Context, Value, CharTy);
    TemplateArgumentLocInfo ArgInfo;
    ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
  }
  return BuildLiteralOperatorCall(R, OpNameInfo, None, StringTokLocs.back(),
                                  &ExplicitArgs);
}
case LOLR_Raw:
case LOLR_Template:
case LOLR_ErrorNoDiagnostic:
  llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1635);
case LOLR_Error:
  return ExprError();
}
llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1639);
1640}

1642ExprResult
1643Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
                     SourceLocation Loc,
                     const CXXScopeSpec *SS) {
DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
1648}

1650/// BuildDeclRefExpr - Build an expression that references a
1651/// declaration that does not require a closure capture.
1652ExprResult
1653Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
                     const DeclarationNameInfo &NameInfo,
                     const CXXScopeSpec *SS, NamedDecl *FoundD,
                     const TemplateArgumentListInfo *TemplateArgs) {
bool RefersToCapturedVariable =
    isa<VarDecl>(D) &&
    NeedToCaptureVariable(cast<VarDecl>(D), NameInfo.getLoc());

DeclRefExpr *E;
if (isa<VarTemplateSpecializationDecl>(D)) {
  VarTemplateSpecializationDecl *VarSpec =
      cast<VarTemplateSpecializationDecl>(D);

  E = DeclRefExpr::Create(Context, SS ? SS->getWithLocInContext(Context)
                                      : NestedNameSpecifierLoc(),
                          VarSpec->getTemplateKeywordLoc(), D,
                          RefersToCapturedVariable, NameInfo.getLoc(), Ty, VK,
                          FoundD, TemplateArgs);
} else {
  assert(!TemplateArgs && "No template arguments for non-variable"(static_cast <bool> (!TemplateArgs && "No template arguments for non-variable"
 " template specialization references") ? void (0) : __assert_fail
 ("!TemplateArgs && \"No template arguments for non-variable\" \" template specialization references\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1673, __extension__ __PRETTY_FUNCTION__))
                          " template specialization references")(static_cast <bool> (!TemplateArgs && "No template arguments for non-variable"
 " template specialization references") ? void (0) : __assert_fail
 ("!TemplateArgs && \"No template arguments for non-variable\" \" template specialization references\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1673, __extension__ __PRETTY_FUNCTION__));
  E = DeclRefExpr::Create(Context, SS ? SS->getWithLocInContext(Context)
                                      : NestedNameSpecifierLoc(),
                          SourceLocation(), D, RefersToCapturedVariable,
                          NameInfo, Ty, VK, FoundD);
}

MarkDeclRefReferenced(E);

if (getLangOpts().ObjCWeak && isa<VarDecl>(D) &&
    Ty.getObjCLifetime() == Qualifiers::OCL_Weak && !isUnevaluatedContext() &&
    !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, E->getLocStart()))
  getCurFunction()->recordUseOfWeak(E);

FieldDecl *FD = dyn_cast<FieldDecl>(D);
if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(D))
  FD = IFD->getAnonField();
if (FD) {
  UnusedPrivateFields.remove(FD);
  // Just in case we're building an illegal pointer-to-member.
  if (FD->isBitField())
    E->setObjectKind(OK_BitField);
}

// C++ [expr.prim]/8: The expression [...] is a bit-field if the identifier
// designates a bit-field.
if (auto *BD = dyn_cast<BindingDecl>(D))
  if (auto *BE = BD->getBinding())
    E->setObjectKind(BE->getObjectKind());

return E;
1704}

1706/// Decomposes the given name into a DeclarationNameInfo, its location, and
1707/// possibly a list of template arguments.
1708///
1709/// If this produces template arguments, it is permitted to call
1710/// DecomposeTemplateName.
1711///
1712/// This actually loses a lot of source location information for
1713/// non-standard name kinds; we should consider preserving that in
1714/// some way.
1715void
1716Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
                           TemplateArgumentListInfo &Buffer,
                           DeclarationNameInfo &NameInfo,
                           const TemplateArgumentListInfo *&TemplateArgs) {
if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId) {
  Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
  Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);

  ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(),
                                     Id.TemplateId->NumArgs);
  translateTemplateArguments(TemplateArgsPtr, Buffer);

  TemplateName TName = Id.TemplateId->Template.get();
  SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
  NameInfo = Context.getNameForTemplate(TName, TNameLoc);
  TemplateArgs = &Buffer;
} else {
  NameInfo = GetNameFromUnqualifiedId(Id);
  TemplateArgs = nullptr;
}
1736}

1738static void emitEmptyLookupTypoDiagnostic(
  const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS,
  DeclarationName Typo, SourceLocation TypoLoc, ArrayRef<Expr *> Args,
  unsigned DiagnosticID, unsigned DiagnosticSuggestID) {
DeclContext *Ctx =
    SS.isEmpty() ? nullptr : SemaRef.computeDeclContext(SS, false);
2
←
'?' condition is true→
if (!TC) {
3
←
Assuming the condition is false→
4
←
Taking false branch→
  // Emit a special diagnostic for failed member lookups.
  // FIXME: computing the declaration context might fail here (?)
  if (Ctx)
    SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << Ctx
                                               << SS.getRange();
  else
    SemaRef.Diag(TypoLoc, DiagnosticID) << Typo;
  return;
}

std::string CorrectedStr = TC.getAsString(SemaRef.getLangOpts());
bool DroppedSpecifier =
    TC.WillReplaceSpecifier() && Typo.getAsString() == CorrectedStr;
5
←
Assuming the condition is false→
unsigned NoteID = TC.getCorrectionDeclAs<ImplicitParamDecl>()
6
←
Assuming the condition is false→
7
←
'?' condition is false→
                      ? diag::note_implicit_param_decl
                      : diag::note_previous_decl;
if (!Ctx)
8
←
Taking true branch→
  SemaRef.diagnoseTypo(TC, SemaRef.PDiag(DiagnosticSuggestID) << Typo,
9
←
Calling 'operator<<'→
22
←
Returned allocated memory→
                       SemaRef.PDiag(NoteID));
23
←
Calling 'Sema::PDiag'→
else
  SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
                               << Typo << Ctx << DroppedSpecifier
                               << SS.getRange(),
                       SemaRef.PDiag(NoteID));
1769}

1771/// Diagnose an empty lookup.
1772///
1773/// \return false if new lookup candidates were found
1774bool
1775Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
                        std::unique_ptr<CorrectionCandidateCallback> CCC,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        ArrayRef<Expr *> Args, TypoExpr **Out) {
DeclarationName Name = R.getLookupName();

unsigned diagnostic = diag::err_undeclared_var_use;
unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
    Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
    Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
  diagnostic = diag::err_undeclared_use;
  diagnostic_suggest = diag::err_undeclared_use_suggest;
}

// If the original lookup was an unqualified lookup, fake an
// unqualified lookup.  This is useful when (for example) the
// original lookup would not have found something because it was a
// dependent name.
DeclContext *DC = SS.isEmpty() ? CurContext : nullptr;
while (DC) {
  if (isa<CXXRecordDecl>(DC)) {
    LookupQualifiedName(R, DC);

    if (!R.empty()) {
      // Don't give errors about ambiguities in this lookup.
      R.suppressDiagnostics();

      // During a default argument instantiation the CurContext points
      // to a CXXMethodDecl; but we can't apply a this-> fixit inside a
      // function parameter list, hence add an explicit check.
      bool isDefaultArgument =
          !CodeSynthesisContexts.empty() &&
          CodeSynthesisContexts.back().Kind ==
              CodeSynthesisContext::DefaultFunctionArgumentInstantiation;
      CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
      bool isInstance = CurMethod &&
                        CurMethod->isInstance() &&
                        DC == CurMethod->getParent() && !isDefaultArgument;

      // Give a code modification hint to insert 'this->'.
      // TODO: fixit for inserting 'Base<T>::' in the other cases.
      // Actually quite difficult!
      if (getLangOpts().MSVCCompat)
        diagnostic = diag::ext_found_via_dependent_bases_lookup;
      if (isInstance) {
        Diag(R.getNameLoc(), diagnostic) << Name
          << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
        CheckCXXThisCapture(R.getNameLoc());
      } else {
        Diag(R.getNameLoc(), diagnostic) << Name;
      }

      // Do we really want to note all of these?
      for (NamedDecl *D : R)
        Diag(D->getLocation(), diag::note_dependent_var_use);

      // Return true if we are inside a default argument instantiation
      // and the found name refers to an instance member function, otherwise
      // the function calling DiagnoseEmptyLookup will try to create an
      // implicit member call and this is wrong for default argument.
      if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
        Diag(R.getNameLoc(), diag::err_member_call_without_object);
        return true;
      }

      // Tell the callee to try to recover.
      return false;
    }

    R.clear();
  }

  // In Microsoft mode, if we are performing lookup from within a friend
  // function definition declared at class scope then we must set
  // DC to the lexical parent to be able to search into the parent
  // class.
  if (getLangOpts().MSVCCompat && isa<FunctionDecl>(DC) &&
      cast<FunctionDecl>(DC)->getFriendObjectKind() &&
      DC->getLexicalParent()->isRecord())
    DC = DC->getLexicalParent();
  else
    DC = DC->getParent();
}

// We didn't find anything, so try to correct for a typo.
TypoCorrection Corrected;
if (S && Out) {
  SourceLocation TypoLoc = R.getNameLoc();
  assert(!ExplicitTemplateArgs &&(static_cast <bool> (!ExplicitTemplateArgs && "Diagnosing an empty lookup with explicit template args!"
) ? void (0) : __assert_fail ("!ExplicitTemplateArgs && \"Diagnosing an empty lookup with explicit template args!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1865, __extension__ __PRETTY_FUNCTION__))
         "Diagnosing an empty lookup with explicit template args!")(static_cast <bool> (!ExplicitTemplateArgs && "Diagnosing an empty lookup with explicit template args!"
) ? void (0) : __assert_fail ("!ExplicitTemplateArgs && \"Diagnosing an empty lookup with explicit template args!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 1865, __extension__ __PRETTY_FUNCTION__));
  *Out = CorrectTypoDelayed(
      R.getLookupNameInfo(), R.getLookupKind(), S, &SS, std::move(CCC),
      [=](const TypoCorrection &TC) {
        emitEmptyLookupTypoDiagnostic(TC, *this, SS, Name, TypoLoc, Args,
1
Calling 'emitEmptyLookupTypoDiagnostic'→
                                      diagnostic, diagnostic_suggest);
      },
      nullptr, CTK_ErrorRecovery);
  if (*Out)
    return true;
} else if (S && (Corrected =
                     CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S,
                                 &SS, std::move(CCC), CTK_ErrorRecovery))) {
  std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
  bool DroppedSpecifier =
      Corrected.WillReplaceSpecifier() && Name.getAsString() == CorrectedStr;
  R.setLookupName(Corrected.getCorrection());

  bool AcceptableWithRecovery = false;
  bool AcceptableWithoutRecovery = false;
  NamedDecl *ND = Corrected.getFoundDecl();
  if (ND) {
    if (Corrected.isOverloaded()) {
      OverloadCandidateSet OCS(R.getNameLoc(),
                               OverloadCandidateSet::CSK_Normal);
      OverloadCandidateSet::iterator Best;
      for (NamedDecl *CD : Corrected) {
        if (FunctionTemplateDecl *FTD =
                 dyn_cast<FunctionTemplateDecl>(CD))
          AddTemplateOverloadCandidate(
              FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
              Args, OCS);
        else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
          if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
            AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
                                 Args, OCS);
      }
      switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
      case OR_Success:
        ND = Best->FoundDecl;
        Corrected.setCorrectionDecl(ND);
        break;
      default:
        // FIXME: Arbitrarily pick the first declaration for the note.
        Corrected.setCorrectionDecl(ND);
        break;
      }
    }
    R.addDecl(ND);
    if (getLangOpts().CPlusPlus && ND->isCXXClassMember()) {
      CXXRecordDecl *Record = nullptr;
      if (Corrected.getCorrectionSpecifier()) {
        const Type *Ty = Corrected.getCorrectionSpecifier()->getAsType();
        Record = Ty->getAsCXXRecordDecl();
      }
      if (!Record)
        Record = cast<CXXRecordDecl>(
            ND->getDeclContext()->getRedeclContext());
      R.setNamingClass(Record);
    }

    auto *UnderlyingND = ND->getUnderlyingDecl();
    AcceptableWithRecovery = isa<ValueDecl>(UnderlyingND) ||
                             isa<FunctionTemplateDecl>(UnderlyingND);
    // FIXME: If we ended up with a typo for a type name or
    // Objective-C class name, we're in trouble because the parser
    // is in the wrong place to recover. Suggest the typo
    // correction, but don't make it a fix-it since we're not going
    // to recover well anyway.
    AcceptableWithoutRecovery =
        isa<TypeDecl>(UnderlyingND) || isa<ObjCInterfaceDecl>(UnderlyingND);
  } else {
    // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
    // because we aren't able to recover.
    AcceptableWithoutRecovery = true;
  }

  if (AcceptableWithRecovery || AcceptableWithoutRecovery) {
    unsigned NoteID = Corrected.getCorrectionDeclAs<ImplicitParamDecl>()
                          ? diag::note_implicit_param_decl
                          : diag::note_previous_decl;
    if (SS.isEmpty())
      diagnoseTypo(Corrected, PDiag(diagnostic_suggest) << Name,
                   PDiag(NoteID), AcceptableWithRecovery);
    else
      diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
                                << Name << computeDeclContext(SS, false)
                                << DroppedSpecifier << SS.getRange(),
                   PDiag(NoteID), AcceptableWithRecovery);

    // Tell the callee whether to try to recover.
    return !AcceptableWithRecovery;
  }
}
R.clear();

// Emit a special diagnostic for failed member lookups.
// FIXME: computing the declaration context might fail here (?)
if (!SS.isEmpty()) {
  Diag(R.getNameLoc(), diag::err_no_member)
    << Name << computeDeclContext(SS, false)
    << SS.getRange();
  return true;
}

// Give up, we can't recover.
Diag(R.getNameLoc(), diagnostic) << Name;
return true;
1973}

1975/// In Microsoft mode, if we are inside a template class whose parent class has
1976/// dependent base classes, and we can't resolve an unqualified identifier, then
1977/// assume the identifier is a member of a dependent base class.  We can only
1978/// recover successfully in static methods, instance methods, and other contexts
1979/// where 'this' is available.  This doesn't precisely match MSVC's
1980/// instantiation model, but it's close enough.
1981static Expr *
1982recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context,
                             DeclarationNameInfo &NameInfo,
                             SourceLocation TemplateKWLoc,
                             const TemplateArgumentListInfo *TemplateArgs) {
// Only try to recover from lookup into dependent bases in static methods or
// contexts where 'this' is available.
QualType ThisType = S.getCurrentThisType();
const CXXRecordDecl *RD = nullptr;
if (!ThisType.isNull())
  RD = ThisType->getPointeeType()->getAsCXXRecordDecl();
else if (auto *MD = dyn_cast<CXXMethodDecl>(S.CurContext))
  RD = MD->getParent();
if (!RD || !RD->hasAnyDependentBases())
  return nullptr;

// Diagnose this as unqualified lookup into a dependent base class.  If 'this'
// is available, suggest inserting 'this->' as a fixit.
SourceLocation Loc = NameInfo.getLoc();
auto DB = S.Diag(Loc, diag::ext_undeclared_unqual_id_with_dependent_base);
DB << NameInfo.getName() << RD;

if (!ThisType.isNull()) {
  DB << FixItHint::CreateInsertion(Loc, "this->");
  return CXXDependentScopeMemberExpr::Create(
      Context, /*This=*/nullptr, ThisType, /*IsArrow=*/true,
      /*Op=*/SourceLocation(), NestedNameSpecifierLoc(), TemplateKWLoc,
      /*FirstQualifierInScope=*/nullptr, NameInfo, TemplateArgs);
}

// Synthesize a fake NNS that points to the derived class.  This will
// perform name lookup during template instantiation.
CXXScopeSpec SS;
auto *NNS =
    NestedNameSpecifier::Create(Context, nullptr, true, RD->getTypeForDecl());
SS.MakeTrivial(Context, NNS, SourceRange(Loc, Loc));
return DependentScopeDeclRefExpr::Create(
    Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
    TemplateArgs);
2020}

2022ExprResult
2023Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
                      SourceLocation TemplateKWLoc, UnqualifiedId &Id,
                      bool HasTrailingLParen, bool IsAddressOfOperand,
                      std::unique_ptr<CorrectionCandidateCallback> CCC,
                      bool IsInlineAsmIdentifier, Token *KeywordReplacement) {
assert(!(IsAddressOfOperand && HasTrailingLParen) &&(static_cast <bool> (!(IsAddressOfOperand && HasTrailingLParen
) && "cannot be direct & operand and have a trailing lparen"
) ? void (0) : __assert_fail ("!(IsAddressOfOperand && HasTrailingLParen) && \"cannot be direct & operand and have a trailing lparen\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2029, __extension__ __PRETTY_FUNCTION__))
       "cannot be direct & operand and have a trailing lparen")(static_cast <bool> (!(IsAddressOfOperand && HasTrailingLParen
) && "cannot be direct & operand and have a trailing lparen"
) ? void (0) : __assert_fail ("!(IsAddressOfOperand && HasTrailingLParen) && \"cannot be direct & operand and have a trailing lparen\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2029, __extension__ __PRETTY_FUNCTION__));
if (SS.isInvalid())
  return ExprError();

TemplateArgumentListInfo TemplateArgsBuffer;

// Decompose the UnqualifiedId into the following data.
DeclarationNameInfo NameInfo;
const TemplateArgumentListInfo *TemplateArgs;
DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);

DeclarationName Name = NameInfo.getName();
IdentifierInfo *II = Name.getAsIdentifierInfo();
SourceLocation NameLoc = NameInfo.getLoc();

if (II && II->isEditorPlaceholder()) {
  // FIXME: When typed placeholders are supported we can create a typed
  // placeholder expression node.
  return ExprError();
}

// C++ [temp.dep.expr]p3:
//   An id-expression is type-dependent if it contains:
//     -- an identifier that was declared with a dependent type,
//        (note: handled after lookup)
//     -- a template-id that is dependent,
//        (note: handled in BuildTemplateIdExpr)
//     -- a conversion-function-id that specifies a dependent type,
//     -- a nested-name-specifier that contains a class-name that
//        names a dependent type.
// Determine whether this is a member of an unknown specialization;
// we need to handle these differently.
bool DependentID = false;
if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
    Name.getCXXNameType()->isDependentType()) {
  DependentID = true;
} else if (SS.isSet()) {
  if (DeclContext *DC = computeDeclContext(SS, false)) {
    if (RequireCompleteDeclContext(SS, DC))
      return ExprError();
  } else {
    DependentID = true;
  }
}

if (DependentID)
  return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
                                    IsAddressOfOperand, TemplateArgs);

// Perform the required lookup.
LookupResult R(*this, NameInfo,
               (Id.getKind() == UnqualifiedIdKind::IK_ImplicitSelfParam)
                   ? LookupObjCImplicitSelfParam
                   : LookupOrdinaryName);
if (TemplateArgs) {
  // Lookup the template name again to correctly establish the context in
  // which it was found. This is really unfortunate as we already did the
  // lookup to determine that it was a template name in the first place. If
  // this becomes a performance hit, we can work harder to preserve those
  // results until we get here but it's likely not worth it.
  bool MemberOfUnknownSpecialization;
  LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
                     MemberOfUnknownSpecialization);
  
  if (MemberOfUnknownSpecialization ||
      (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
    return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
                                      IsAddressOfOperand, TemplateArgs);
} else {
  bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl();
  LookupParsedName(R, S, &SS, !IvarLookupFollowUp);

  // If the result might be in a dependent base class, this is a dependent 
  // id-expression.
  if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
    return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
                                      IsAddressOfOperand, TemplateArgs);

  // If this reference is in an Objective-C method, then we need to do
  // some special Objective-C lookup, too.
  if (IvarLookupFollowUp) {
    ExprResult E(LookupInObjCMethod(R, S, II, true));
    if (E.isInvalid())
      return ExprError();

    if (Expr *Ex = E.getAs<Expr>())
      return Ex;
  }
}

if (R.isAmbiguous())
  return ExprError();

// This could be an implicitly declared function reference (legal in C90,
// extension in C99, forbidden in C++).
if (R.empty() && HasTrailingLParen && II && !getLangOpts().CPlusPlus) {
  NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
  if (D) R.addDecl(D);
}

// Determine whether this name might be a candidate for
// argument-dependent lookup.
bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);

if (R.empty() && !ADL) {
  if (SS.isEmpty() && getLangOpts().MSVCCompat) {
    if (Expr *E = recoverFromMSUnqualifiedLookup(*this, Context, NameInfo,
                                                 TemplateKWLoc, TemplateArgs))
      return E;
  }

  // Don't diagnose an empty lookup for inline assembly.
  if (IsInlineAsmIdentifier)
    return ExprError();

  // If this name wasn't predeclared and if this is not a function
  // call, diagnose the problem.
  TypoExpr *TE = nullptr;
  auto DefaultValidator = llvm::make_unique<CorrectionCandidateCallback>(
      II, SS.isValid() ? SS.getScopeRep() : nullptr);
  DefaultValidator->IsAddressOfOperand = IsAddressOfOperand;
  assert((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) &&(static_cast <bool> ((!CCC || CCC->IsAddressOfOperand
 == IsAddressOfOperand) && "Typo correction callback misconfigured"
) ? void (0) : __assert_fail ("(!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && \"Typo correction callback misconfigured\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2151, __extension__ __PRETTY_FUNCTION__))
         "Typo correction callback misconfigured")(static_cast <bool> ((!CCC || CCC->IsAddressOfOperand
 == IsAddressOfOperand) && "Typo correction callback misconfigured"
) ? void (0) : __assert_fail ("(!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && \"Typo correction callback misconfigured\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2151, __extension__ __PRETTY_FUNCTION__));
  if (CCC) {
    // Make sure the callback knows what the typo being diagnosed is.
    CCC->setTypoName(II);
    if (SS.isValid())
      CCC->setTypoNNS(SS.getScopeRep());
  }
  if (DiagnoseEmptyLookup(S, SS, R,
                          CCC ? std::move(CCC) : std::move(DefaultValidator),
                          nullptr, None, &TE)) {
    if (TE && KeywordReplacement) {
      auto &State = getTypoExprState(TE);
      auto BestTC = State.Consumer->getNextCorrection();
      if (BestTC.isKeyword()) {
        auto *II = BestTC.getCorrectionAsIdentifierInfo();
        if (State.DiagHandler)
          State.DiagHandler(BestTC);
        KeywordReplacement->startToken();
        KeywordReplacement->setKind(II->getTokenID());
        KeywordReplacement->setIdentifierInfo(II);
        KeywordReplacement->setLocation(BestTC.getCorrectionRange().getBegin());
        // Clean up the state associated with the TypoExpr, since it has
        // now been diagnosed (without a call to CorrectDelayedTyposInExpr).
        clearDelayedTypo(TE);
        // Signal that a correction to a keyword was performed by returning a
        // valid-but-null ExprResult.
        return (Expr*)nullptr;
      }
      State.Consumer->resetCorrectionStream();
    }
    return TE ? TE : ExprError();
  }

  assert(!R.empty() &&(static_cast <bool> (!R.empty() && "DiagnoseEmptyLookup returned false but added no results"
) ? void (0) : __assert_fail ("!R.empty() && \"DiagnoseEmptyLookup returned false but added no results\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2185, __extension__ __PRETTY_FUNCTION__))
         "DiagnoseEmptyLookup returned false but added no results")(static_cast <bool> (!R.empty() && "DiagnoseEmptyLookup returned false but added no results"
) ? void (0) : __assert_fail ("!R.empty() && \"DiagnoseEmptyLookup returned false but added no results\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2185, __extension__ __PRETTY_FUNCTION__));

  // If we found an Objective-C instance variable, let
  // LookupInObjCMethod build the appropriate expression to
  // reference the ivar.
  if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
    R.clear();
    ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
    // In a hopelessly buggy code, Objective-C instance variable
    // lookup fails and no expression will be built to reference it.
    if (!E.isInvalid() && !E.get())
      return ExprError();
    return E;
  }
}

// This is guaranteed from this point on.
assert(!R.empty() || ADL)(static_cast <bool> (!R.empty() || ADL) ? void (0) : __assert_fail
 ("!R.empty() || ADL", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2202, __extension__ __PRETTY_FUNCTION__));

// Check whether this might be a C++ implicit instance member access.
// C++ [class.mfct.non-static]p3:
//   When an id-expression that is not part of a class member access
//   syntax and not used to form a pointer to member is used in the
//   body of a non-static member function of class X, if name lookup
//   resolves the name in the id-expression to a non-static non-type
//   member of some class C, the id-expression is transformed into a
//   class member access expression using (*this) as the
//   postfix-expression to the left of the . operator.
//
// But we don't actually need to do this for '&' operands if R
// resolved to a function or overloaded function set, because the
// expression is ill-formed if it actually works out to be a
// non-static member function:
//
// C++ [expr.ref]p4:
//   Otherwise, if E1.E2 refers to a non-static member function. . .
//   [t]he expression can be used only as the left-hand operand of a
//   member function call.
//
// There are other safeguards against such uses, but it's important
// to get this right here so that we don't end up making a
// spuriously dependent expression if we're inside a dependent
// instance method.
if (!R.empty() && (*R.begin())->isCXXClassMember()) {
  bool MightBeImplicitMember;
  if (!IsAddressOfOperand)
    MightBeImplicitMember = true;
  else if (!SS.isEmpty())
    MightBeImplicitMember = false;
  else if (R.isOverloadedResult())
    MightBeImplicitMember = false;
  else if (R.isUnresolvableResult())
    MightBeImplicitMember = true;
  else
    MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
                            isa<IndirectFieldDecl>(R.getFoundDecl()) ||
                            isa<MSPropertyDecl>(R.getFoundDecl());

  if (MightBeImplicitMember)
    return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc,
                                           R, TemplateArgs, S);
}

if (TemplateArgs || TemplateKWLoc.isValid()) {

  // In C++1y, if this is a variable template id, then check it
  // in BuildTemplateIdExpr().
  // The single lookup result must be a variable template declaration.
  if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId && Id.TemplateId &&
      Id.TemplateId->Kind == TNK_Var_template) {
    assert(R.getAsSingle<VarTemplateDecl>() &&(static_cast <bool> (R.getAsSingle<VarTemplateDecl>
() && "There should only be one declaration found.") ?
 void (0) : __assert_fail ("R.getAsSingle<VarTemplateDecl>() && \"There should only be one declaration found.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2256, __extension__ __PRETTY_FUNCTION__))
           "There should only be one declaration found.")(static_cast <bool> (R.getAsSingle<VarTemplateDecl>
() && "There should only be one declaration found.") ?
 void (0) : __assert_fail ("R.getAsSingle<VarTemplateDecl>() && \"There should only be one declaration found.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2256, __extension__ __PRETTY_FUNCTION__));
  }

  return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs);
}

return BuildDeclarationNameExpr(SS, R, ADL);
2263}

2265/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
2266/// declaration name, generally during template instantiation.
2267/// There's a large number of things which don't need to be done along
2268/// this path.
2269ExprResult Sema::BuildQualifiedDeclarationNameExpr(
  CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo,
  bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI) {
DeclContext *DC = computeDeclContext(SS, false);
if (!DC)
  return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
                                   NameInfo, /*TemplateArgs=*/nullptr);

if (RequireCompleteDeclContext(SS, DC))
  return ExprError();

LookupResult R(*this, NameInfo, LookupOrdinaryName);
LookupQualifiedName(R, DC);

if (R.isAmbiguous())
  return ExprError();

if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
  return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
                                   NameInfo, /*TemplateArgs=*/nullptr);

if (R.empty()) {
  Diag(NameInfo.getLoc(), diag::err_no_member)
    << NameInfo.getName() << DC << SS.getRange();
  return ExprError();
}

if (const TypeDecl *TD = R.getAsSingle<TypeDecl>()) {
  // Diagnose a missing typename if this resolved unambiguously to a type in
  // a dependent context.  If we can recover with a type, downgrade this to
  // a warning in Microsoft compatibility mode.
  unsigned DiagID = diag::err_typename_missing;
  if (RecoveryTSI && getLangOpts().MSVCCompat)
    DiagID = diag::ext_typename_missing;
  SourceLocation Loc = SS.getBeginLoc();
  auto D = Diag(Loc, DiagID);
  D << SS.getScopeRep() << NameInfo.getName().getAsString()
    << SourceRange(Loc, NameInfo.getEndLoc());

  // Don't recover if the caller isn't expecting us to or if we're in a SFINAE
  // context.
  if (!RecoveryTSI)
    return ExprError();

  // Only issue the fixit if we're prepared to recover.
  D << FixItHint::CreateInsertion(Loc, "typename ");

  // Recover by pretending this was an elaborated type.
  QualType Ty = Context.getTypeDeclType(TD);
  TypeLocBuilder TLB;
  TLB.pushTypeSpec(Ty).setNameLoc(NameInfo.getLoc());

  QualType ET = getElaboratedType(ETK_None, SS, Ty);
  ElaboratedTypeLoc QTL = TLB.push<ElaboratedTypeLoc>(ET);
  QTL.setElaboratedKeywordLoc(SourceLocation());
  QTL.setQualifierLoc(SS.getWithLocInContext(Context));

  *RecoveryTSI = TLB.getTypeSourceInfo(Context, ET);

  return ExprEmpty();
}

// Defend against this resolving to an implicit member access. We usually
// won't get here if this might be a legitimate a class member (we end up in
// BuildMemberReferenceExpr instead), but this can be valid if we're forming
// a pointer-to-member or in an unevaluated context in C++11.
if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand)
  return BuildPossibleImplicitMemberExpr(SS,
                                         /*TemplateKWLoc=*/SourceLocation(),
                                         R, /*TemplateArgs=*/nullptr, S);

return BuildDeclarationNameExpr(SS, R, /* ADL */ false);
2341}

2343/// LookupInObjCMethod - The parser has read a name in, and Sema has
2344/// detected that we're currently inside an ObjC method.  Perform some
2345/// additional lookup.
2346///
2347/// Ideally, most of this would be done by lookup, but there's
2348/// actually quite a lot of extra work involved.
2349///
2350/// Returns a null sentinel to indicate trivial success.
2351ExprResult
2352Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
                       IdentifierInfo *II, bool AllowBuiltinCreation) {
SourceLocation Loc = Lookup.getNameLoc();
ObjCMethodDecl *CurMethod = getCurMethodDecl();

// Check for error condition which is already reported.
if (!CurMethod)
  return ExprError();

// There are two cases to handle here.  1) scoped lookup could have failed,
// in which case we should look for an ivar.  2) scoped lookup could have
// found a decl, but that decl is outside the current instance method (i.e.
// a global variable).  In these two cases, we do a lookup for an ivar with
// this name, if the lookup sucedes, we replace it our current decl.

// If we're in a class method, we don't normally want to look for
// ivars.  But if we don't find anything else, and there's an
// ivar, that's an error.
bool IsClassMethod = CurMethod->isClassMethod();

bool LookForIvars;
if (Lookup.empty())
  LookForIvars = true;
else if (IsClassMethod)
  LookForIvars = false;
else
  LookForIvars = (Lookup.isSingleResult() &&
                  Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
ObjCInterfaceDecl *IFace = nullptr;
if (LookForIvars) {
  IFace = CurMethod->getClassInterface();
  ObjCInterfaceDecl *ClassDeclared;
  ObjCIvarDecl *IV = nullptr;
  if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
    // Diagnose using an ivar in a class method.
    if (IsClassMethod)
      return ExprError(Diag(Loc, diag::err_ivar_use_in_class_method)
                       << IV->getDeclName());

    // If we're referencing an invalid decl, just return this as a silent
    // error node.  The error diagnostic was already emitted on the decl.
    if (IV->isInvalidDecl())
      return ExprError();

    // Check if referencing a field with __attribute__((deprecated)).
    if (DiagnoseUseOfDecl(IV, Loc))
      return ExprError();

    // Diagnose the use of an ivar outside of the declaring class.
    if (IV->getAccessControl() == ObjCIvarDecl::Private &&
        !declaresSameEntity(ClassDeclared, IFace) &&
        !getLangOpts().DebuggerSupport)
      Diag(Loc, diag::err_private_ivar_access) << IV->getDeclName();

    // FIXME: This should use a new expr for a direct reference, don't
    // turn this into Self->ivar, just return a BareIVarExpr or something.
    IdentifierInfo &II = Context.Idents.get("self");
    UnqualifiedId SelfName;
    SelfName.setIdentifier(&II, SourceLocation());
    SelfName.setKind(UnqualifiedIdKind::IK_ImplicitSelfParam);
    CXXScopeSpec SelfScopeSpec;
    SourceLocation TemplateKWLoc;
    ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc,
                                            SelfName, false, false);
    if (SelfExpr.isInvalid())
      return ExprError();

    SelfExpr = DefaultLvalueConversion(SelfExpr.get());
    if (SelfExpr.isInvalid())
      return ExprError();

    MarkAnyDeclReferenced(Loc, IV, true);

    ObjCMethodFamily MF = CurMethod->getMethodFamily();
    if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize &&
        !IvarBacksCurrentMethodAccessor(IFace, CurMethod, IV))
      Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName();

    ObjCIvarRefExpr *Result = new (Context)
        ObjCIvarRefExpr(IV, IV->getUsageType(SelfExpr.get()->getType()), Loc,
                        IV->getLocation(), SelfExpr.get(), true, true);

    if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
      if (!isUnevaluatedContext() &&
          !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
        getCurFunction()->recordUseOfWeak(Result);
    }
    if (getLangOpts().ObjCAutoRefCount) {
      if (CurContext->isClosure())
        Diag(Loc, diag::warn_implicitly_retains_self)
          << FixItHint::CreateInsertion(Loc, "self->");
    }
    
    return Result;
  }
} else if (CurMethod->isInstanceMethod()) {
  // We should warn if a local variable hides an ivar.
  if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
    ObjCInterfaceDecl *ClassDeclared;
    if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
      if (IV->getAccessControl() != ObjCIvarDecl::Private ||
          declaresSameEntity(IFace, ClassDeclared))
        Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
    }
  }
} else if (Lookup.isSingleResult() &&
           Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
  // If accessing a stand-alone ivar in a class method, this is an error.
  if (const ObjCIvarDecl *IV = dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl()))
    return ExprError(Diag(Loc, diag::err_ivar_use_in_class_method)
                     << IV->getDeclName());
}

if (Lookup.empty() && II && AllowBuiltinCreation) {
  // FIXME. Consolidate this with similar code in LookupName.
  if (unsigned BuiltinID = II->getBuiltinID()) {
    if (!(getLangOpts().CPlusPlus &&
          Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
      NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
                                         S, Lookup.isForRedeclaration(),
                                         Lookup.getNameLoc());
      if (D) Lookup.addDecl(D);
    }
  }
}
// Sentinel value saying that we didn't do anything special.
return ExprResult((Expr *)nullptr);
2479}

2481/// \brief Cast a base object to a member's actual type.
2482///
2483/// Logically this happens in three phases:
2484///
2485/// * First we cast from the base type to the naming class.
2486///   The naming class is the class into which we were looking
2487///   when we found the member;  it's the qualifier type if a
2488///   qualifier was provided, and otherwise it's the base type.
2489///
2490/// * Next we cast from the naming class to the declaring class.
2491///   If the member we found was brought into a class's scope by
2492///   a using declaration, this is that class;  otherwise it's
2493///   the class declaring the member.
2494///
2495/// * Finally we cast from the declaring class to the "true"
2496///   declaring class of the member.  This conversion does not
2497///   obey access control.
2498ExprResult
2499Sema::PerformObjectMemberConversion(Expr *From,
                                  NestedNameSpecifier *Qualifier,
                                  NamedDecl *FoundDecl,
                                  NamedDecl *Member) {
CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
if (!RD)
  return From;

QualType DestRecordType;
QualType DestType;
QualType FromRecordType;
QualType FromType = From->getType();
bool PointerConversions = false;
if (isa<FieldDecl>(Member)) {
  DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));

  if (FromType->getAs<PointerType>()) {
    DestType = Context.getPointerType(DestRecordType);
    FromRecordType = FromType->getPointeeType();
    PointerConversions = true;
  } else {
    DestType = DestRecordType;
    FromRecordType = FromType;
  }
} else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
  if (Method->isStatic())
    return From;

  DestType = Method->getThisType(Context);
  DestRecordType = DestType->getPointeeType();

  if (FromType->getAs<PointerType>()) {
    FromRecordType = FromType->getPointeeType();
    PointerConversions = true;
  } else {
    FromRecordType = FromType;
    DestType = DestRecordType;
  }
} else {
  // No conversion necessary.
  return From;
}

if (DestType->isDependentType() || FromType->isDependentType())
  return From;

// If the unqualified types are the same, no conversion is necessary.
if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
  return From;

SourceRange FromRange = From->getSourceRange();
SourceLocation FromLoc = FromRange.getBegin();

ExprValueKind VK = From->getValueKind();

// C++ [class.member.lookup]p8:
//   [...] Ambiguities can often be resolved by qualifying a name with its
//   class name.
//
// If the member was a qualified name and the qualified referred to a
// specific base subobject type, we'll cast to that intermediate type
// first and then to the object in which the member is declared. That allows
// one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
//
//   class Base { public: int x; };
//   class Derived1 : public Base { };
//   class Derived2 : public Base { };
//   class VeryDerived : public Derived1, public Derived2 { void f(); };
//
//   void VeryDerived::f() {
//     x = 17; // error: ambiguous base subobjects
//     Derived1::x = 17; // okay, pick the Base subobject of Derived1
//   }
if (Qualifier && Qualifier->getAsType()) {
  QualType QType = QualType(Qualifier->getAsType(), 0);
  assert(QType->isRecordType() && "lookup done with non-record type")(static_cast <bool> (QType->isRecordType() &&
 "lookup done with non-record type") ? void (0) : __assert_fail
 ("QType->isRecordType() && \"lookup done with non-record type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2574, __extension__ __PRETTY_FUNCTION__));

  QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);

  // In C++98, the qualifier type doesn't actually have to be a base
  // type of the object type, in which case we just ignore it.
  // Otherwise build the appropriate casts.
  if (IsDerivedFrom(FromLoc, FromRecordType, QRecordType)) {
    CXXCastPath BasePath;
    if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
                                     FromLoc, FromRange, &BasePath))
      return ExprError();

    if (PointerConversions)
      QType = Context.getPointerType(QType);
    From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
                             VK, &BasePath).get();

    FromType = QType;
    FromRecordType = QRecordType;

    // If the qualifier type was the same as the destination type,
    // we're done.
    if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
      return From;
  }
}

bool IgnoreAccess = false;

// If we actually found the member through a using declaration, cast
// down to the using declaration's type.
//
// Pointer equality is fine here because only one declaration of a
// class ever has member declarations.
if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
  assert(isa<UsingShadowDecl>(FoundDecl))(static_cast <bool> (isa<UsingShadowDecl>(FoundDecl
)) ? void (0) : __assert_fail ("isa<UsingShadowDecl>(FoundDecl)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2610, __extension__ __PRETTY_FUNCTION__));
  QualType URecordType = Context.getTypeDeclType(
                         cast<CXXRecordDecl>(FoundDecl->getDeclContext()));

  // We only need to do this if the naming-class to declaring-class
  // conversion is non-trivial.
  if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
    assert(IsDerivedFrom(FromLoc, FromRecordType, URecordType))(static_cast <bool> (IsDerivedFrom(FromLoc, FromRecordType
, URecordType)) ? void (0) : __assert_fail ("IsDerivedFrom(FromLoc, FromRecordType, URecordType)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2617, __extension__ __PRETTY_FUNCTION__));
    CXXCastPath BasePath;
    if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
                                     FromLoc, FromRange, &BasePath))
      return ExprError();

    QualType UType = URecordType;
    if (PointerConversions)
      UType = Context.getPointerType(UType);
    From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
                             VK, &BasePath).get();
    FromType = UType;
    FromRecordType = URecordType;
  }

  // We don't do access control for the conversion from the
  // declaring class to the true declaring class.
  IgnoreAccess = true;
}

CXXCastPath BasePath;
if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
                                 FromLoc, FromRange, &BasePath,
                                 IgnoreAccess))
  return ExprError();

return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
                         VK, &BasePath);
2645}

2647bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
                                    const LookupResult &R,
                                    bool HasTrailingLParen) {
// Only when used directly as the postfix-expression of a call.
if (!HasTrailingLParen)
  return false;

// Never if a scope specifier was provided.
if (SS.isSet())
  return false;

// Only in C++ or ObjC++.
if (!getLangOpts().CPlusPlus)
  return false;

// Turn off ADL when we find certain kinds of declarations during
// normal lookup:
for (NamedDecl *D : R) {
  // C++0x [basic.lookup.argdep]p3:
  //     -- a declaration of a class member
  // Since using decls preserve this property, we check this on the
  // original decl.
  if (D->isCXXClassMember())
    return false;

  // C++0x [basic.lookup.argdep]p3:
  //     -- a block-scope function declaration that is not a
  //        using-declaration
  // NOTE: we also trigger this for function templates (in fact, we
  // don't check the decl type at all, since all other decl types
  // turn off ADL anyway).
  if (isa<UsingShadowDecl>(D))
    D = cast<UsingShadowDecl>(D)->getTargetDecl();
  else if (D->getLexicalDeclContext()->isFunctionOrMethod())
    return false;

  // C++0x [basic.lookup.argdep]p3:
  //     -- a declaration that is neither a function or a function
  //        template
  // And also for builtin functions.
  if (isa<FunctionDecl>(D)) {
    FunctionDecl *FDecl = cast<FunctionDecl>(D);

    // But also builtin functions.
    if (FDecl->getBuiltinID() && FDecl->isImplicit())
      return false;
  } else if (!isa<FunctionTemplateDecl>(D))
    return false;
}

return true;
2698}


2701/// Diagnoses obvious problems with the use of the given declaration
2702/// as an expression.  This is only actually called for lookups that
2703/// were not overloaded, and it doesn't promise that the declaration
2704/// will in fact be used.
2705static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
if (D->isInvalidDecl())
  return true;

if (isa<TypedefNameDecl>(D)) {
  S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
  return true;
}

if (isa<ObjCInterfaceDecl>(D)) {
  S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
  return true;
}

if (isa<NamespaceDecl>(D)) {
  S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
  return true;
}

return false;
2725}

2727ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                        LookupResult &R, bool NeedsADL,
                                        bool AcceptInvalidDecl) {
// If this is a single, fully-resolved result and we don't need ADL,
// just build an ordinary singleton decl ref.
if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
  return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), R.getFoundDecl(),
                                  R.getRepresentativeDecl(), nullptr,
                                  AcceptInvalidDecl);

// We only need to check the declaration if there's exactly one
// result, because in the overloaded case the results can only be
// functions and function templates.
if (R.isSingleResult() &&
    CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
  return ExprError();

// Otherwise, just build an unresolved lookup expression.  Suppress
// any lookup-related diagnostics; we'll hash these out later, when
// we've picked a target.
R.suppressDiagnostics();

UnresolvedLookupExpr *ULE
  = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
                                 SS.getWithLocInContext(Context),
                                 R.getLookupNameInfo(),
                                 NeedsADL, R.isOverloadedResult(),
                                 R.begin(), R.end());

return ULE;
2757}

2759static void
2760diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
                                 ValueDecl *var, DeclContext *DC);

2763/// \brief Complete semantic analysis for a reference to the given declaration.
2764ExprResult Sema::BuildDeclarationNameExpr(
  const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
  NamedDecl *FoundD, const TemplateArgumentListInfo *TemplateArgs,
  bool AcceptInvalidDecl) {
assert(D && "Cannot refer to a NULL declaration")(static_cast <bool> (D && "Cannot refer to a NULL declaration"
) ? void (0) : __assert_fail ("D && \"Cannot refer to a NULL declaration\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2768, __extension__ __PRETTY_FUNCTION__));
assert(!isa<FunctionTemplateDecl>(D) &&(static_cast <bool> (!isa<FunctionTemplateDecl>(D
) && "Cannot refer unambiguously to a function template"
) ? void (0) : __assert_fail ("!isa<FunctionTemplateDecl>(D) && \"Cannot refer unambiguously to a function template\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2770, __extension__ __PRETTY_FUNCTION__))
       "Cannot refer unambiguously to a function template")(static_cast <bool> (!isa<FunctionTemplateDecl>(D
) && "Cannot refer unambiguously to a function template"
) ? void (0) : __assert_fail ("!isa<FunctionTemplateDecl>(D) && \"Cannot refer unambiguously to a function template\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2770, __extension__ __PRETTY_FUNCTION__));

SourceLocation Loc = NameInfo.getLoc();
if (CheckDeclInExpr(*this, Loc, D))
  return ExprError();

if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
  // Specifically diagnose references to class templates that are missing
  // a template argument list.
  Diag(Loc, diag::err_template_decl_ref) << (isa<VarTemplateDecl>(D) ? 1 : 0)
                                         << Template << SS.getRange();
  Diag(Template->getLocation(), diag::note_template_decl_here);
  return ExprError();
}

// Make sure that we're referring to a value.
ValueDecl *VD = dyn_cast<ValueDecl>(D);
if (!VD) {
  Diag(Loc, diag::err_ref_non_value)
    << D << SS.getRange();
  Diag(D->getLocation(), diag::note_declared_at);
  return ExprError();
}

// Check whether this declaration can be used. Note that we suppress
// this check when we're going to perform argument-dependent lookup
// on this function name, because this might not be the function
// that overload resolution actually selects.
if (DiagnoseUseOfDecl(VD, Loc))
  return ExprError();

// Only create DeclRefExpr's for valid Decl's.
if (VD->isInvalidDecl() && !AcceptInvalidDecl)
  return ExprError();

// Handle members of anonymous structs and unions.  If we got here,
// and the reference is to a class member indirect field, then this
// must be the subject of a pointer-to-member expression.
if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
  if (!indirectField->isCXXClassMember())
    return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
                                                    indirectField);

{
  QualType type = VD->getType();
  if (type.isNull())
    return ExprError();
  if (auto *FPT = type->getAs<FunctionProtoType>()) {
    // C++ [except.spec]p17:
    //   An exception-specification is considered to be needed when:
    //   - in an expression, the function is the unique lookup result or
    //     the selected member of a set of overloaded functions.
    ResolveExceptionSpec(Loc, FPT);
    type = VD->getType();
  }
  ExprValueKind valueKind = VK_RValue;

  switch (D->getKind()) {
  // Ignore all the non-ValueDecl kinds.
2829#define ABSTRACT_DECL(kind)
2830#define VALUE(type, base)
2831#define DECL(type, base) \
  case Decl::type:
2833#include "clang/AST/DeclNodes.inc"
    llvm_unreachable("invalid value decl kind")::llvm::llvm_unreachable_internal("invalid value decl kind", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2834);

  // These shouldn't make it here.
  case Decl::ObjCAtDefsField:
  case Decl::ObjCIvar:
    llvm_unreachable("forming non-member reference to ivar?")::llvm::llvm_unreachable_internal("forming non-member reference to ivar?"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2839);

  // Enum constants are always r-values and never references.
  // Unresolved using declarations are dependent.
  case Decl::EnumConstant:
  case Decl::UnresolvedUsingValue:
  case Decl::OMPDeclareReduction:
    valueKind = VK_RValue;
    break;

  // Fields and indirect fields that got here must be for
  // pointer-to-member expressions; we just call them l-values for
  // internal consistency, because this subexpression doesn't really
  // exist in the high-level semantics.
  case Decl::Field:
  case Decl::IndirectField:
    assert(getLangOpts().CPlusPlus &&(static_cast <bool> (getLangOpts().CPlusPlus &&
 "building reference to field in C?") ? void (0) : __assert_fail
 ("getLangOpts().CPlusPlus && \"building reference to field in C?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2856, __extension__ __PRETTY_FUNCTION__))
           "building reference to field in C?")(static_cast <bool> (getLangOpts().CPlusPlus &&
 "building reference to field in C?") ? void (0) : __assert_fail
 ("getLangOpts().CPlusPlus && \"building reference to field in C?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2856, __extension__ __PRETTY_FUNCTION__));

    // These can't have reference type in well-formed programs, but
    // for internal consistency we do this anyway.
    type = type.getNonReferenceType();
    valueKind = VK_LValue;
    break;

  // Non-type template parameters are either l-values or r-values
  // depending on the type.
  case Decl::NonTypeTemplateParm: {
    if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
      type = reftype->getPointeeType();
      valueKind = VK_LValue; // even if the parameter is an r-value reference
      break;
    }

    // For non-references, we need to strip qualifiers just in case
    // the template parameter was declared as 'const int' or whatever.
    valueKind = VK_RValue;
    type = type.getUnqualifiedType();
    break;
  }

  case Decl::Var:
  case Decl::VarTemplateSpecialization:
  case Decl::VarTemplatePartialSpecialization:
  case Decl::Decomposition:
  case Decl::OMPCapturedExpr:
    // In C, "extern void blah;" is valid and is an r-value.
    if (!getLangOpts().CPlusPlus &&
        !type.hasQualifiers() &&
        type->isVoidType()) {
      valueKind = VK_RValue;
      break;
    }
    LLVM_FALLTHROUGH[[clang::fallthrough]];

  case Decl::ImplicitParam:
  case Decl::ParmVar: {
    // These are always l-values.
    valueKind = VK_LValue;
    type = type.getNonReferenceType();

    // FIXME: Does the addition of const really only apply in
    // potentially-evaluated contexts? Since the variable isn't actually
    // captured in an unevaluated context, it seems that the answer is no.
    if (!isUnevaluatedContext()) {
      QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc);
      if (!CapturedType.isNull())
        type = CapturedType;
    }
    
    break;
  }

  case Decl::Binding: {
    // These are always lvalues.
    valueKind = VK_LValue;
    type = type.getNonReferenceType();
    // FIXME: Support lambda-capture of BindingDecls, once CWG actually
    // decides how that's supposed to work.
    auto *BD = cast<BindingDecl>(VD);
    if (BD->getDeclContext()->isFunctionOrMethod() &&
        BD->getDeclContext() != CurContext)
      diagnoseUncapturableValueReference(*this, Loc, BD, CurContext);
    break;
  }
      
  case Decl::Function: {
    if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) {
      if (!Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
        type = Context.BuiltinFnTy;
        valueKind = VK_RValue;
        break;
      }
    }

    const FunctionType *fty = type->castAs<FunctionType>();

    // If we're referring to a function with an __unknown_anytype
    // result type, make the entire expression __unknown_anytype.
    if (fty->getReturnType() == Context.UnknownAnyTy) {
      type = Context.UnknownAnyTy;
      valueKind = VK_RValue;
      break;
    }

    // Functions are l-values in C++.
    if (getLangOpts().CPlusPlus) {
      valueKind = VK_LValue;
      break;
    }
    
    // C99 DR 316 says that, if a function type comes from a
    // function definition (without a prototype), that type is only
    // used for checking compatibility. Therefore, when referencing
    // the function, we pretend that we don't have the full function
    // type.
    if (!cast<FunctionDecl>(VD)->hasPrototype() &&
        isa<FunctionProtoType>(fty))
      type = Context.getFunctionNoProtoType(fty->getReturnType(),
                                            fty->getExtInfo());

    // Functions are r-values in C.
    valueKind = VK_RValue;
    break;
  }

  case Decl::CXXDeductionGuide:
    llvm_unreachable("building reference to deduction guide")::llvm::llvm_unreachable_internal("building reference to deduction guide"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 2966);

  case Decl::MSProperty:
    valueKind = VK_LValue;
    break;

  case Decl::CXXMethod:
    // If we're referring to a method with an __unknown_anytype
    // result type, make the entire expression __unknown_anytype.
    // This should only be possible with a type written directly.
    if (const FunctionProtoType *proto
          = dyn_cast<FunctionProtoType>(VD->getType()))
      if (proto->getReturnType() == Context.UnknownAnyTy) {
        type = Context.UnknownAnyTy;
        valueKind = VK_RValue;
        break;
      }

    // C++ methods are l-values if static, r-values if non-static.
    if (cast<CXXMethodDecl>(VD)->isStatic()) {
      valueKind = VK_LValue;
      break;
    }
    LLVM_FALLTHROUGH[[clang::fallthrough]];

  case Decl::CXXConversion:
  case Decl::CXXDestructor:
  case Decl::CXXConstructor:
    valueKind = VK_RValue;
    break;
  }

  return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS, FoundD,
                          TemplateArgs);
}
3001}

3003static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source,
                                  SmallString<32> &Target) {
Target.resize(CharByteWidth * (Source.size() + 1));
char *ResultPtr = &Target[0];
const llvm::UTF8 *ErrorPtr;
bool success =
    llvm::ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr);
(void)success;
assert(success)(static_cast <bool> (success) ? void (0) : __assert_fail
 ("success", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3011, __extension__ __PRETTY_FUNCTION__));
Target.resize(ResultPtr - &Target[0]);
3013}

3015ExprResult Sema::BuildPredefinedExpr(SourceLocation Loc,
                                   PredefinedExpr::IdentType IT) {
// Pick the current block, lambda, captured statement or function.
Decl *currentDecl = nullptr;
if (const BlockScopeInfo *BSI = getCurBlock())
  currentDecl = BSI->TheDecl;
else if (const LambdaScopeInfo *LSI = getCurLambda())
  currentDecl = LSI->CallOperator;
else if (const CapturedRegionScopeInfo *CSI = getCurCapturedRegion())
  currentDecl = CSI->TheCapturedDecl;
else
  currentDecl = getCurFunctionOrMethodDecl();

if (!currentDecl) {
  Diag(Loc, diag::ext_predef_outside_function);
  currentDecl = Context.getTranslationUnitDecl();
}

QualType ResTy;
StringLiteral *SL = nullptr;
if (cast<DeclContext>(currentDecl)->isDependentContext())
  ResTy = Context.DependentTy;
else {
  // Pre-defined identifiers are of type char[x], where x is the length of
  // the string.
  auto Str = PredefinedExpr::ComputeName(IT, currentDecl);
  unsigned Length = Str.length();

  llvm::APInt LengthI(32, Length + 1);
  if (IT == PredefinedExpr::LFunction) {
    ResTy = Context.WideCharTy.withConst();
    SmallString<32> RawChars;
    ConvertUTF8ToWideString(Context.getTypeSizeInChars(ResTy).getQuantity(),
                            Str, RawChars);
    ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal,
                                         /*IndexTypeQuals*/ 0);
    SL = StringLiteral::Create(Context, RawChars, StringLiteral::Wide,
                               /*Pascal*/ false, ResTy, Loc);
  } else {
    ResTy = Context.CharTy.withConst();
    ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal,
                                         /*IndexTypeQuals*/ 0);
    SL = StringLiteral::Create(Context, Str, StringLiteral::Ascii,
                               /*Pascal*/ false, ResTy, Loc);
  }
}

return new (Context) PredefinedExpr(Loc, ResTy, IT, SL);
3063}

3065ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
PredefinedExpr::IdentType IT;

switch (Kind) {
default: llvm_unreachable("Unknown simple primary expr!")::llvm::llvm_unreachable_internal("Unknown simple primary expr!"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3069);
case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
case tok::kw___FUNCDNAME__: IT = PredefinedExpr::FuncDName; break; // [MS]
case tok::kw___FUNCSIG__: IT = PredefinedExpr::FuncSig; break; // [MS]
case tok::kw_L__FUNCTION__: IT = PredefinedExpr::LFunction; break;
case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
}

return BuildPredefinedExpr(Loc, IT);
3079}

3081ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) {
SmallString<16> CharBuffer;
bool Invalid = false;
StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
if (Invalid)
  return ExprError();

CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
                          PP, Tok.getKind());
if (Literal.hadError())
  return ExprError();

QualType Ty;
if (Literal.isWide())
  Ty = Context.WideCharTy; // L'x' -> wchar_t in C and C++.
else if (Literal.isUTF16())
  Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11.
else if (Literal.isUTF32())
  Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11.
else if (!getLangOpts().CPlusPlus || Literal.isMultiChar())
  Ty = Context.IntTy;   // 'x' -> int in C, 'wxyz' -> int in C++.
else
  Ty = Context.CharTy;  // 'x' -> char in C++

CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
if (Literal.isWide())
  Kind = CharacterLiteral::Wide;
else if (Literal.isUTF16())
  Kind = CharacterLiteral::UTF16;
else if (Literal.isUTF32())
  Kind = CharacterLiteral::UTF32;
else if (Literal.isUTF8())
  Kind = CharacterLiteral::UTF8;

Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
                                           Tok.getLocation());

if (Literal.getUDSuffix().empty())
  return Lit;

// We're building a user-defined literal.
IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
SourceLocation UDSuffixLoc =
  getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());

// Make sure we're allowed user-defined literals here.
if (!UDLScope)
  return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl));

// C++11 [lex.ext]p6: The literal L is treated as a call of the form
//   operator "" X (ch)
return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
                                      Lit, Tok.getLocation());
3134}

3136ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) {
unsigned IntSize = Context.getTargetInfo().getIntWidth();
return IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val),
                              Context.IntTy, Loc);
3140}

3142static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
                                QualType Ty, SourceLocation Loc) {
const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty);

using llvm::APFloat;
APFloat Val(Format);

APFloat::opStatus result = Literal.GetFloatValue(Val);

// Overflow is always an error, but underflow is only an error if
// we underflowed to zero (APFloat reports denormals as underflow).
if ((result & APFloat::opOverflow) ||
    ((result & APFloat::opUnderflow) && Val.isZero())) {
  unsigned diagnostic;
  SmallString<20> buffer;
  if (result & APFloat::opOverflow) {
    diagnostic = diag::warn_float_overflow;
    APFloat::getLargest(Format).toString(buffer);
  } else {
    diagnostic = diag::warn_float_underflow;
    APFloat::getSmallest(Format).toString(buffer);
  }

  S.Diag(Loc, diagnostic)
    << Ty
    << StringRef(buffer.data(), buffer.size());
}

bool isExact = (result == APFloat::opOK);
return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc);
3172}

3174bool Sema::CheckLoopHintExpr(Expr *E, SourceLocation Loc) {
assert(E && "Invalid expression")(static_cast <bool> (E && "Invalid expression")
 ? void (0) : __assert_fail ("E && \"Invalid expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3175, __extension__ __PRETTY_FUNCTION__));

if (E->isValueDependent())
  return false;

QualType QT = E->getType();
if (!QT->isIntegerType() || QT->isBooleanType() || QT->isCharType()) {
  Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_type) << QT;
  return true;
}

llvm::APSInt ValueAPS;
ExprResult R = VerifyIntegerConstantExpression(E, &ValueAPS);

if (R.isInvalid())
  return true;

bool ValueIsPositive = ValueAPS.isStrictlyPositive();
if (!ValueIsPositive || ValueAPS.getActiveBits() > 31) {
  Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_value)
      << ValueAPS.toString(10) << ValueIsPositive;
  return true;
}

return false;
3200}

3202ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
// Fast path for a single digit (which is quite common).  A single digit
// cannot have a trigraph, escaped newline, radix prefix, or suffix.
if (Tok.getLength() == 1) {
  const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
  return ActOnIntegerConstant(Tok.getLocation(), Val-'0');
}

SmallString<128> SpellingBuffer;
// NumericLiteralParser wants to overread by one character.  Add padding to
// the buffer in case the token is copied to the buffer.  If getSpelling()
// returns a StringRef to the memory buffer, it should have a null char at
// the EOF, so it is also safe.
SpellingBuffer.resize(Tok.getLength() + 1);

// Get the spelling of the token, which eliminates trigraphs, etc.
bool Invalid = false;
StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
if (Invalid)
  return ExprError();

NumericLiteralParser Literal(TokSpelling, Tok.getLocation(), PP);
if (Literal.hadError)
  return ExprError();

if (Literal.hasUDSuffix()) {
  // We're building a user-defined literal.
  IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
  SourceLocation UDSuffixLoc =
    getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());

  // Make sure we're allowed user-defined literals here.
  if (!UDLScope)
    return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl));

  QualType CookedTy;
  if (Literal.isFloatingLiteral()) {
    // C++11 [lex.ext]p4: If S contains a literal operator with parameter type
    // long double, the literal is treated as a call of the form
    //   operator "" X (f L)
    CookedTy = Context.LongDoubleTy;
  } else {
    // C++11 [lex.ext]p3: If S contains a literal operator with parameter type
    // unsigned long long, the literal is treated as a call of the form
    //   operator "" X (n ULL)
    CookedTy = Context.UnsignedLongLongTy;
  }

  DeclarationName OpName =
    Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
  DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
  OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);

  SourceLocation TokLoc = Tok.getLocation();

  // Perform literal operator lookup to determine if we're building a raw
  // literal or a cooked one.
  LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
  switch (LookupLiteralOperator(UDLScope, R, CookedTy,
                                /*AllowRaw*/ true, /*AllowTemplate*/ true,
                                /*AllowStringTemplate*/ false,
                                /*DiagnoseMissing*/ !Literal.isImaginary)) {
  case LOLR_ErrorNoDiagnostic:
    // Lookup failure for imaginary constants isn't fatal, there's still the
    // GNU extension producing _Complex types.
    break;
  case LOLR_Error:
    return ExprError();
  case LOLR_Cooked: {
    Expr *Lit;
    if (Literal.isFloatingLiteral()) {
      Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation());
    } else {
      llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0);
      if (Literal.GetIntegerValue(ResultVal))
        Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
            << /* Unsigned */ 1;
      Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy,
                                   Tok.getLocation());
    }
    return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
  }

  case LOLR_Raw: {
    // C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the
    // literal is treated as a call of the form
    //   operator "" X ("n")
    unsigned Length = Literal.getUDSuffixOffset();
    QualType StrTy = Context.getConstantArrayType(
        Context.CharTy.withConst(), llvm::APInt(32, Length + 1),
        ArrayType::Normal, 0);
    Expr *Lit = StringLiteral::Create(
        Context, StringRef(TokSpelling.data(), Length), StringLiteral::Ascii,
        /*Pascal*/false, StrTy, &TokLoc, 1);
    return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
  }

  case LOLR_Template: {
    // C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator
    // template), L is treated as a call fo the form
    //   operator "" X <'c1', 'c2', ... 'ck'>()
    // where n is the source character sequence c1 c2 ... ck.
    TemplateArgumentListInfo ExplicitArgs;
    unsigned CharBits = Context.getIntWidth(Context.CharTy);
    bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType();
    llvm::APSInt Value(CharBits, CharIsUnsigned);
    for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) {
      Value = TokSpelling[I];
      TemplateArgument Arg(Context, Value, Context.CharTy);
      TemplateArgumentLocInfo ArgInfo;
      ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
    }
    return BuildLiteralOperatorCall(R, OpNameInfo, None, TokLoc,
                                    &ExplicitArgs);
  }
  case LOLR_StringTemplate:
    llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3318);
  }
}

Expr *Res;

if (Literal.isFloatingLiteral()) {
  QualType Ty;
  if (Literal.isHalf){
    if (getOpenCLOptions().isEnabled("cl_khr_fp16"))
      Ty = Context.HalfTy;
    else {
      Diag(Tok.getLocation(), diag::err_half_const_requires_fp16);
      return ExprError();
    }
  } else if (Literal.isFloat)
    Ty = Context.FloatTy;
  else if (Literal.isLong)
    Ty = Context.LongDoubleTy;
  else if (Literal.isFloat16)
    Ty = Context.Float16Ty;
  else if (Literal.isFloat128)
    Ty = Context.Float128Ty;
  else
    Ty = Context.DoubleTy;

  Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation());

  if (Ty == Context.DoubleTy) {
    if (getLangOpts().SinglePrecisionConstants) {
      const BuiltinType *BTy = Ty->getAs<BuiltinType>();
      if (BTy->getKind() != BuiltinType::Float) {
        Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
      }
    } else if (getLangOpts().OpenCL &&
               !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
      // Impose single-precision float type when cl_khr_fp64 is not enabled.
      Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
      Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
    }
  }
} else if (!Literal.isIntegerLiteral()) {
  return ExprError();
} else {
  QualType Ty;

  // 'long long' is a C99 or C++11 feature.
  if (!getLangOpts().C99 && Literal.isLongLong) {
    if (getLangOpts().CPlusPlus)
      Diag(Tok.getLocation(),
           getLangOpts().CPlusPlus11 ?
           diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
    else
      Diag(Tok.getLocation(), diag::ext_c99_longlong);
  }

  // Get the value in the widest-possible width.
  unsigned MaxWidth = Context.getTargetInfo().getIntMaxTWidth();
  llvm::APInt ResultVal(MaxWidth, 0);

  if (Literal.GetIntegerValue(ResultVal)) {
    // If this value didn't fit into uintmax_t, error and force to ull.
    Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
        << /* Unsigned */ 1;
    Ty = Context.UnsignedLongLongTy;
    assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&(static_cast <bool> (Context.getTypeSize(Ty) == ResultVal
.getBitWidth() && "long long is not intmax_t?") ? void
 (0) : __assert_fail ("Context.getTypeSize(Ty) == ResultVal.getBitWidth() && \"long long is not intmax_t?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3384, __extension__ __PRETTY_FUNCTION__))
           "long long is not intmax_t?")(static_cast <bool> (Context.getTypeSize(Ty) == ResultVal
.getBitWidth() && "long long is not intmax_t?") ? void
 (0) : __assert_fail ("Context.getTypeSize(Ty) == ResultVal.getBitWidth() && \"long long is not intmax_t?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3384, __extension__ __PRETTY_FUNCTION__));
  } else {
    // If this value fits into a ULL, try to figure out what else it fits into
    // according to the rules of C99 6.4.4.1p5.

    // Octal, Hexadecimal, and integers with a U suffix are allowed to
    // be an unsigned int.
    bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;

    // Check from smallest to largest, picking the smallest type we can.
    unsigned Width = 0;

    // Microsoft specific integer suffixes are explicitly sized.
    if (Literal.MicrosoftInteger) {
      if (Literal.MicrosoftInteger == 8 && !Literal.isUnsigned) {
        Width = 8;
        Ty = Context.CharTy;
      } else {
        Width = Literal.MicrosoftInteger;
        Ty = Context.getIntTypeForBitwidth(Width,
                                           /*Signed=*/!Literal.isUnsigned);
      }
    }

    if (Ty.isNull() && !Literal.isLong && !Literal.isLongLong) {
      // Are int/unsigned possibilities?
      unsigned IntSize = Context.getTargetInfo().getIntWidth();

      // Does it fit in a unsigned int?
      if (ResultVal.isIntN(IntSize)) {
        // Does it fit in a signed int?
        if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
          Ty = Context.IntTy;
        else if (AllowUnsigned)
          Ty = Context.UnsignedIntTy;
        Width = IntSize;
      }
    }

    // Are long/unsigned long possibilities?
    if (Ty.isNull() && !Literal.isLongLong) {
      unsigned LongSize = Context.getTargetInfo().getLongWidth();

      // Does it fit in a unsigned long?
      if (ResultVal.isIntN(LongSize)) {
        // Does it fit in a signed long?
        if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
          Ty = Context.LongTy;
        else if (AllowUnsigned)
          Ty = Context.UnsignedLongTy;
        // Check according to the rules of C90 6.1.3.2p5. C++03 [lex.icon]p2
        // is compatible.
        else if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) {
          const unsigned LongLongSize =
              Context.getTargetInfo().getLongLongWidth();
          Diag(Tok.getLocation(),
               getLangOpts().CPlusPlus
                   ? Literal.isLong
                         ? diag::warn_old_implicitly_unsigned_long_cxx
                         : /*C++98 UB*/ diag::
                               ext_old_implicitly_unsigned_long_cxx
                   : diag::warn_old_implicitly_unsigned_long)
              << (LongLongSize > LongSize ? /*will have type 'long long'*/ 0
                                          : /*will be ill-formed*/ 1);
          Ty = Context.UnsignedLongTy;
        }
        Width = LongSize;
      }
    }

    // Check long long if needed.
    if (Ty.isNull()) {
      unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();

      // Does it fit in a unsigned long long?
      if (ResultVal.isIntN(LongLongSize)) {
        // Does it fit in a signed long long?
        // To be compatible with MSVC, hex integer literals ending with the
        // LL or i64 suffix are always signed in Microsoft mode.
        if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
            (getLangOpts().MSVCCompat && Literal.isLongLong)))
          Ty = Context.LongLongTy;
        else if (AllowUnsigned)
          Ty = Context.UnsignedLongLongTy;
        Width = LongLongSize;
      }
    }

    // If we still couldn't decide a type, we probably have something that
    // does not fit in a signed long long, but has no U suffix.
    if (Ty.isNull()) {
      Diag(Tok.getLocation(), diag::ext_integer_literal_too_large_for_signed);
      Ty = Context.UnsignedLongLongTy;
      Width = Context.getTargetInfo().getLongLongWidth();
    }

    if (ResultVal.getBitWidth() != Width)
      ResultVal = ResultVal.trunc(Width);
  }
  Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
}

// If this is an imaginary literal, create the ImaginaryLiteral wrapper.
if (Literal.isImaginary) {
  Res = new (Context) ImaginaryLiteral(Res,
                                      Context.getComplexType(Res->getType()));

  Diag(Tok.getLocation(), diag::ext_imaginary_constant);
}
return Res;
3494}

3496ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
assert(E && "ActOnParenExpr() missing expr")(static_cast <bool> (E && "ActOnParenExpr() missing expr"
) ? void (0) : __assert_fail ("E && \"ActOnParenExpr() missing expr\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3497, __extension__ __PRETTY_FUNCTION__));
return new (Context) ParenExpr(L, R, E);
3499}

3501static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
                                       SourceLocation Loc,
                                       SourceRange ArgRange) {
// [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
// scalar or vector data type argument..."
// Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
// type (C99 6.2.5p18) or void.
if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
  S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
    << T << ArgRange;
  return true;
}

assert((T->isVoidType() || !T->isIncompleteType()) &&(static_cast <bool> ((T->isVoidType() || !T->isIncompleteType
()) && "Scalar types should always be complete") ? void
 (0) : __assert_fail ("(T->isVoidType() || !T->isIncompleteType()) && \"Scalar types should always be complete\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3515, __extension__ __PRETTY_FUNCTION__))
       "Scalar types should always be complete")(static_cast <bool> ((T->isVoidType() || !T->isIncompleteType
()) && "Scalar types should always be complete") ? void
 (0) : __assert_fail ("(T->isVoidType() || !T->isIncompleteType()) && \"Scalar types should always be complete\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3515, __extension__ __PRETTY_FUNCTION__));
return false;
3517}

3519static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
                                         SourceLocation Loc,
                                         SourceRange ArgRange,
                                         UnaryExprOrTypeTrait TraitKind) {
// Invalid types must be hard errors for SFINAE in C++.
if (S.LangOpts.CPlusPlus)
  return true;

// C99 6.5.3.4p1:
if (T->isFunctionType() &&
    (TraitKind == UETT_SizeOf || TraitKind == UETT_AlignOf)) {
  // sizeof(function)/alignof(function) is allowed as an extension.
  S.Diag(Loc, diag::ext_sizeof_alignof_function_type)
    << TraitKind << ArgRange;
  return false;
}

// Allow sizeof(void)/alignof(void) as an extension, unless in OpenCL where
// this is an error (OpenCL v1.1 s6.3.k)
if (T->isVoidType()) {
  unsigned DiagID = S.LangOpts.OpenCL ? diag::err_opencl_sizeof_alignof_type
                                      : diag::ext_sizeof_alignof_void_type;
  S.Diag(Loc, DiagID) << TraitKind << ArgRange;
  return false;
}

return true;
3546}

3548static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
                                           SourceLocation Loc,
                                           SourceRange ArgRange,
                                           UnaryExprOrTypeTrait TraitKind) {
// Reject sizeof(interface) and sizeof(interface<proto>) if the
// runtime doesn't allow it.
if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) {
  S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
    << T << (TraitKind == UETT_SizeOf)
    << ArgRange;
  return true;
}

return false;
3562}

3564/// \brief Check whether E is a pointer from a decayed array type (the decayed
3565/// pointer type is equal to T) and emit a warning if it is.
3566static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T,
                                   Expr *E) {
// Don't warn if the operation changed the type.
if (T != E->getType())
  return;

// Now look for array decays.
ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E);
if (!ICE || ICE->getCastKind() != CK_ArrayToPointerDecay)
  return;

S.Diag(Loc, diag::warn_sizeof_array_decay) << ICE->getSourceRange()
                                           << ICE->getType()
                                           << ICE->getSubExpr()->getType();
3580}

3582/// \brief Check the constraints on expression operands to unary type expression
3583/// and type traits.
3584///
3585/// Completes any types necessary and validates the constraints on the operand
3586/// expression. The logic mostly mirrors the type-based overload, but may modify
3587/// the expression as it completes the type for that expression through template
3588/// instantiation, etc.
3589bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
                                          UnaryExprOrTypeTrait ExprKind) {
QualType ExprTy = E->getType();
assert(!ExprTy->isReferenceType())(static_cast <bool> (!ExprTy->isReferenceType()) ? void
 (0) : __assert_fail ("!ExprTy->isReferenceType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3592, __extension__ __PRETTY_FUNCTION__));

if (ExprKind == UETT_VecStep)
  return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
                                      E->getSourceRange());

// Whitelist some types as extensions
if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
                                    E->getSourceRange(), ExprKind))
  return false;

// 'alignof' applied to an expression only requires the base element type of
// the expression to be complete. 'sizeof' requires the expression's type to
// be complete (and will attempt to complete it if it's an array of unknown
// bound).
if (ExprKind == UETT_AlignOf) {
  if (RequireCompleteType(E->getExprLoc(),
                          Context.getBaseElementType(E->getType()),
                          diag::err_sizeof_alignof_incomplete_type, ExprKind,
                          E->getSourceRange()))
    return true;
} else {
  if (RequireCompleteExprType(E, diag::err_sizeof_alignof_incomplete_type,
                              ExprKind, E->getSourceRange()))
    return true;
}

// Completing the expression's type may have changed it.
ExprTy = E->getType();
assert(!ExprTy->isReferenceType())(static_cast <bool> (!ExprTy->isReferenceType()) ? void
 (0) : __assert_fail ("!ExprTy->isReferenceType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3621, __extension__ __PRETTY_FUNCTION__));

if (ExprTy->isFunctionType()) {
  Diag(E->getExprLoc(), diag::err_sizeof_alignof_function_type)
    << ExprKind << E->getSourceRange();
  return true;
}

// The operand for sizeof and alignof is in an unevaluated expression context,
// so side effects could result in unintended consequences.
if ((ExprKind == UETT_SizeOf || ExprKind == UETT_AlignOf) &&
    !inTemplateInstantiation() && E->HasSideEffects(Context, false))
  Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);

if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
                                     E->getSourceRange(), ExprKind))
  return true;

if (ExprKind == UETT_SizeOf) {
  if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
    if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
      QualType OType = PVD->getOriginalType();
      QualType Type = PVD->getType();
      if (Type->isPointerType() && OType->isArrayType()) {
        Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
          << Type << OType;
        Diag(PVD->getLocation(), diag::note_declared_at);
      }
    }
  }

  // Warn on "sizeof(array op x)" and "sizeof(x op array)", where the array
  // decays into a pointer and returns an unintended result. This is most
  // likely a typo for "sizeof(array) op x".
  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E->IgnoreParens())) {
    warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
                             BO->getLHS());
    warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
                             BO->getRHS());
  }
}

return false;
3664}

3666/// \brief Check the constraints on operands to unary expression and type
3667/// traits.
3668///
3669/// This will complete any types necessary, and validate the various constraints
3670/// on those operands.
3671///
3672/// The UsualUnaryConversions() function is *not* called by this routine.
3673/// C99 6.3.2.1p[2-4] all state:
3674///   Except when it is the operand of the sizeof operator ...
3675///
3676/// C++ [expr.sizeof]p4
3677///   The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
3678///   standard conversions are not applied to the operand of sizeof.
3679///
3680/// This policy is followed for all of the unary trait expressions.
3681bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
                                          SourceLocation OpLoc,
                                          SourceRange ExprRange,
                                          UnaryExprOrTypeTrait ExprKind) {
if (ExprType->isDependentType())
  return false;

// C++ [expr.sizeof]p2:
//     When applied to a reference or a reference type, the result
//     is the size of the referenced type.
// C++11 [expr.alignof]p3:
//     When alignof is applied to a reference type, the result
//     shall be the alignment of the referenced type.
if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
  ExprType = Ref->getPointeeType();

// C11 6.5.3.4/3, C++11 [expr.alignof]p3:
//   When alignof or _Alignof is applied to an array type, the result
//   is the alignment of the element type.
if (ExprKind == UETT_AlignOf || ExprKind == UETT_OpenMPRequiredSimdAlign)
  ExprType = Context.getBaseElementType(ExprType);

if (ExprKind == UETT_VecStep)
  return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);

// Whitelist some types as extensions
if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
                                    ExprKind))
  return false;

if (RequireCompleteType(OpLoc, ExprType,
                        diag::err_sizeof_alignof_incomplete_type,
                        ExprKind, ExprRange))
  return true;

if (ExprType->isFunctionType()) {
  Diag(OpLoc, diag::err_sizeof_alignof_function_type)
    << ExprKind << ExprRange;
  return true;
}

if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
                                     ExprKind))
  return true;

return false;
3727}

3729static bool CheckAlignOfExpr(Sema &S, Expr *E) {
E = E->IgnoreParens();

// Cannot know anything else if the expression is dependent.
if (E->isTypeDependent())
  return false;

if (E->getObjectKind() == OK_BitField) {
  S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
     << 1 << E->getSourceRange();
  return true;
}

ValueDecl *D = nullptr;
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  D = DRE->getDecl();
} else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
  D = ME->getMemberDecl();
}

// If it's a field, require the containing struct to have a
// complete definition so that we can compute the layout.
//
// This can happen in C++11 onwards, either by naming the member
// in a way that is not transformed into a member access expression
// (in an unevaluated operand, for instance), or by naming the member
// in a trailing-return-type.
//
// For the record, since __alignof__ on expressions is a GCC
// extension, GCC seems to permit this but always gives the
// nonsensical answer 0.
//
// We don't really need the layout here --- we could instead just
// directly check for all the appropriate alignment-lowing
// attributes --- but that would require duplicating a lot of
// logic that just isn't worth duplicating for such a marginal
// use-case.
if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
  // Fast path this check, since we at least know the record has a
  // definition if we can find a member of it.
  if (!FD->getParent()->isCompleteDefinition()) {
    S.Diag(E->getExprLoc(), diag::err_alignof_member_of_incomplete_type)
      << E->getSourceRange();
    return true;
  }

  // Otherwise, if it's a field, and the field doesn't have
  // reference type, then it must have a complete type (or be a
  // flexible array member, which we explicitly want to
  // white-list anyway), which makes the following checks trivial.
  if (!FD->getType()->isReferenceType())
    return false;
}

return S.CheckUnaryExprOrTypeTraitOperand(E, UETT_AlignOf);
3784}

3786bool Sema::CheckVecStepExpr(Expr *E) {
E = E->IgnoreParens();

// Cannot know anything else if the expression is dependent.
if (E->isTypeDependent())
  return false;

return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
3794}

3796static void captureVariablyModifiedType(ASTContext &Context, QualType T,
                                      CapturingScopeInfo *CSI) {
assert(T->isVariablyModifiedType())(static_cast <bool> (T->isVariablyModifiedType()) ? void
 (0) : __assert_fail ("T->isVariablyModifiedType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3798, __extension__ __PRETTY_FUNCTION__));
assert(CSI != nullptr)(static_cast <bool> (CSI != nullptr) ? void (0) : __assert_fail
 ("CSI != nullptr", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3799, __extension__ __PRETTY_FUNCTION__));

// We're going to walk down into the type and look for VLA expressions.
do {
  const Type *Ty = T.getTypePtr();
  switch (Ty->getTypeClass()) {
3805#define TYPE(Class, Base)
3806#define ABSTRACT_TYPE(Class, Base)
3807#define NON_CANONICAL_TYPE(Class, Base)
3808#define DEPENDENT_TYPE(Class, Base) case Type::Class:
3809#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
3810#include "clang/AST/TypeNodes.def"
    T = QualType();
    break;
  // These types are never variably-modified.
  case Type::Builtin:
  case Type::Complex:
  case Type::Vector:
  case Type::ExtVector:
  case Type::Record:
  case Type::Enum:
  case Type::Elaborated:
  case Type::TemplateSpecialization:
  case Type::ObjCObject:
  case Type::ObjCInterface:
  case Type::ObjCObjectPointer:
  case Type::ObjCTypeParam:
  case Type::Pipe:
    llvm_unreachable("type class is never variably-modified!")::llvm::llvm_unreachable_internal("type class is never variably-modified!"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 3827);
  case Type::Adjusted:
    T = cast<AdjustedType>(Ty)->getOriginalType();
    break;
  case Type::Decayed:
    T = cast<DecayedType>(Ty)->getPointeeType();
    break;
  case Type::Pointer:
    T = cast<PointerType>(Ty)->getPointeeType();
    break;
  case Type::BlockPointer:
    T = cast<BlockPointerType>(Ty)->getPointeeType();
    break;
  case Type::LValueReference:
  case Type::RValueReference:
    T = cast<ReferenceType>(Ty)->getPointeeType();
    break;
  case Type::MemberPointer:
    T = cast<MemberPointerType>(Ty)->getPointeeType();
    break;
  case Type::ConstantArray:
  case Type::IncompleteArray:
    // Losing element qualification here is fine.
    T = cast<ArrayType>(Ty)->getElementType();
    break;
  case Type::VariableArray: {
    // Losing element qualification here is fine.
    const VariableArrayType *VAT = cast<VariableArrayType>(Ty);

    // Unknown size indication requires no size computation.
    // Otherwise, evaluate and record it.
    if (auto Size = VAT->getSizeExpr()) {
      if (!CSI->isVLATypeCaptured(VAT)) {
        RecordDecl *CapRecord = nullptr;
        if (auto LSI = dyn_cast<LambdaScopeInfo>(CSI)) {
          CapRecord = LSI->Lambda;
        } else if (auto CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
          CapRecord = CRSI->TheRecordDecl;
        }
        if (CapRecord) {
          auto ExprLoc = Size->getExprLoc();
          auto SizeType = Context.getSizeType();
          // Build the non-static data member.
          auto Field =
              FieldDecl::Create(Context, CapRecord, ExprLoc, ExprLoc,
                                /*Id*/ nullptr, SizeType, /*TInfo*/ nullptr,
                                /*BW*/ nullptr, /*Mutable*/ false,
                                /*InitStyle*/ ICIS_NoInit);
          Field->setImplicit(true);
          Field->setAccess(AS_private);
          Field->setCapturedVLAType(VAT);
          CapRecord->addDecl(Field);

          CSI->addVLATypeCapture(ExprLoc, SizeType);
        }
      }
    }
    T = VAT->getElementType();
    break;
  }
  case Type::FunctionProto:
  case Type::FunctionNoProto:
    T = cast<FunctionType>(Ty)->getReturnType();
    break;
  case Type::Paren:
  case Type::TypeOf:
  case Type::UnaryTransform:
  case Type::Attributed:
  case Type::SubstTemplateTypeParm:
  case Type::PackExpansion:
    // Keep walking after single level desugaring.
    T = T.getSingleStepDesugaredType(Context);
    break;
  case Type::Typedef:
    T = cast<TypedefType>(Ty)->desugar();
    break;
  case Type::Decltype:
    T = cast<DecltypeType>(Ty)->desugar();
    break;
  case Type::Auto:
  case Type::DeducedTemplateSpecialization:
    T = cast<DeducedType>(Ty)->getDeducedType();
    break;
  case Type::TypeOfExpr:
    T = cast<TypeOfExprType>(Ty)->getUnderlyingExpr()->getType();
    break;
  case Type::Atomic:
    T = cast<AtomicType>(Ty)->getValueType();
    break;
  }
} while (!T.isNull() && T->isVariablyModifiedType());
3918}

3920/// \brief Build a sizeof or alignof expression given a type operand.
3921ExprResult
3922Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
                                   SourceLocation OpLoc,
                                   UnaryExprOrTypeTrait ExprKind,
                                   SourceRange R) {
if (!TInfo)
  return ExprError();

QualType T = TInfo->getType();

if (!T->isDependentType() &&
    CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
  return ExprError();

if (T->isVariablyModifiedType() && FunctionScopes.size() > 1) {
  if (auto *TT = T->getAs<TypedefType>()) {
    for (auto I = FunctionScopes.rbegin(),
              E = std::prev(FunctionScopes.rend());
         I != E; ++I) {
      auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
      if (CSI == nullptr)
        break;
      DeclContext *DC = nullptr;
      if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
        DC = LSI->CallOperator;
      else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
        DC = CRSI->TheCapturedDecl;
      else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
        DC = BSI->TheDecl;
      if (DC) {
        if (DC->containsDecl(TT->getDecl()))
          break;
        captureVariablyModifiedType(Context, T, CSI);
      }
    }
  }
}

// C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
return new (Context) UnaryExprOrTypeTraitExpr(
    ExprKind, TInfo, Context.getSizeType(), OpLoc, R.getEnd());
3962}

3964/// \brief Build a sizeof or alignof expression given an expression
3965/// operand.
3966ExprResult
3967Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
                                   UnaryExprOrTypeTrait ExprKind) {
ExprResult PE = CheckPlaceholderExpr(E);
if (PE.isInvalid()) 
  return ExprError();

E = PE.get();

// Verify that the operand is valid.
bool isInvalid = false;
if (E->isTypeDependent()) {
  // Delay type-checking for type-dependent expressions.
} else if (ExprKind == UETT_AlignOf) {
  isInvalid = CheckAlignOfExpr(*this, E);
} else if (ExprKind == UETT_VecStep) {
  isInvalid = CheckVecStepExpr(E);
} else if (ExprKind == UETT_OpenMPRequiredSimdAlign) {
    Diag(E->getExprLoc(), diag::err_openmp_default_simd_align_expr);
    isInvalid = true;
} else if (E->refersToBitField()) {  // C99 6.5.3.4p1.
  Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 0;
  isInvalid = true;
} else {
  isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
}

if (isInvalid)
  return ExprError();

if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) {
  PE = TransformToPotentiallyEvaluated(E);
  if (PE.isInvalid()) return ExprError();
  E = PE.get();
}

// C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
return new (Context) UnaryExprOrTypeTraitExpr(
    ExprKind, E, Context.getSizeType(), OpLoc, E->getSourceRange().getEnd());
4005}

4007/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
4008/// expr and the same for @c alignof and @c __alignof
4009/// Note that the ArgRange is invalid if isType is false.
4010ExprResult
4011Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
                                  UnaryExprOrTypeTrait ExprKind, bool IsType,
                                  void *TyOrEx, SourceRange ArgRange) {
// If error parsing type, ignore.
if (!TyOrEx) return ExprError();

if (IsType) {
  TypeSourceInfo *TInfo;
  (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
  return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
}

Expr *ArgEx = (Expr *)TyOrEx;
ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
return Result;
4026}

4028static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
                                   bool IsReal) {
if (V.get()->isTypeDependent())
  return S.Context.DependentTy;

// _Real and _Imag are only l-values for normal l-values.
if (V.get()->getObjectKind() != OK_Ordinary) {
  V = S.DefaultLvalueConversion(V.get());
  if (V.isInvalid())
    return QualType();
}

// These operators return the element type of a complex type.
if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
  return CT->getElementType();

// Otherwise they pass through real integer and floating point types here.
if (V.get()->getType()->isArithmeticType())
  return V.get()->getType();

// Test for placeholders.
ExprResult PR = S.CheckPlaceholderExpr(V.get());
if (PR.isInvalid()) return QualType();
if (PR.get() != V.get()) {
  V = PR;
  return CheckRealImagOperand(S, V, Loc, IsReal);
}

// Reject anything else.
S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
  << (IsReal ? "__real" : "__imag");
return QualType();
4060}



4064ExprResult
4065Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
                        tok::TokenKind Kind, Expr *Input) {
UnaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown unary op!")::llvm::llvm_unreachable_internal("Unknown unary op!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4069);
case tok::plusplus:   Opc = UO_PostInc; break;
case tok::minusminus: Opc = UO_PostDec; break;
}

// Since this might is a postfix expression, get rid of ParenListExprs.
ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input);
if (Result.isInvalid()) return ExprError();
Input = Result.get();

return BuildUnaryOp(S, OpLoc, Opc, Input);
4080}

4082/// \brief Diagnose if arithmetic on the given ObjC pointer is illegal.
4083///
4084/// \return true on error
4085static bool checkArithmeticOnObjCPointer(Sema &S,
                                       SourceLocation opLoc,
                                       Expr *op) {
assert(op->getType()->isObjCObjectPointerType())(static_cast <bool> (op->getType()->isObjCObjectPointerType
()) ? void (0) : __assert_fail ("op->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4088, __extension__ __PRETTY_FUNCTION__));
if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic() &&
    !S.LangOpts.ObjCSubscriptingLegacyRuntime)
  return false;

S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface)
  << op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType()
  << op->getSourceRange();
return true;
4097}

4099static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base) {
auto *BaseNoParens = Base->IgnoreParens();
if (auto *MSProp = dyn_cast<MSPropertyRefExpr>(BaseNoParens))
  return MSProp->getPropertyDecl()->getType()->isArrayType();
return isa<MSPropertySubscriptExpr>(BaseNoParens);
4104}

4106ExprResult
4107Sema::ActOnArraySubscriptExpr(Scope *S, Expr *base, SourceLocation lbLoc,
                            Expr *idx, SourceLocation rbLoc) {
if (base && !base->getType().isNull() &&
    base->getType()->isSpecificPlaceholderType(BuiltinType::OMPArraySection))
  return ActOnOMPArraySectionExpr(base, lbLoc, idx, SourceLocation(),
                                  /*Length=*/nullptr, rbLoc);

// Since this might be a postfix expression, get rid of ParenListExprs.
if (isa<ParenListExpr>(base)) {
  ExprResult result = MaybeConvertParenListExprToParenExpr(S, base);
  if (result.isInvalid()) return ExprError();
  base = result.get();
}

// Handle any non-overload placeholder types in the base and index
// expressions.  We can't handle overloads here because the other
// operand might be an overloadable type, in which case the overload
// resolution for the operator overload should get the first crack
// at the overload.
bool IsMSPropertySubscript = false;
if (base->getType()->isNonOverloadPlaceholderType()) {
  IsMSPropertySubscript = isMSPropertySubscriptExpr(*this, base);
  if (!IsMSPropertySubscript) {
    ExprResult result = CheckPlaceholderExpr(base);
    if (result.isInvalid())
      return ExprError();
    base = result.get();
  }
}
if (idx->getType()->isNonOverloadPlaceholderType()) {
  ExprResult result = CheckPlaceholderExpr(idx);
  if (result.isInvalid()) return ExprError();
  idx = result.get();
}

// Build an unanalyzed expression if either operand is type-dependent.
if (getLangOpts().CPlusPlus &&
    (base->isTypeDependent() || idx->isTypeDependent())) {
  return new (Context) ArraySubscriptExpr(base, idx, Context.DependentTy,
                                          VK_LValue, OK_Ordinary, rbLoc);
}

// MSDN, property (C++)
// https://msdn.microsoft.com/en-us/library/yhfk0thd(v=vs.120).aspx
// This attribute can also be used in the declaration of an empty array in a
// class or structure definition. For example:
// __declspec(property(get=GetX, put=PutX)) int x[];
// The above statement indicates that x[] can be used with one or more array
// indices. In this case, i=p->x[a][b] will be turned into i=p->GetX(a, b),
// and p->x[a][b] = i will be turned into p->PutX(a, b, i);
if (IsMSPropertySubscript) {
  // Build MS property subscript expression if base is MS property reference
  // or MS property subscript.
  return new (Context) MSPropertySubscriptExpr(
      base, idx, Context.PseudoObjectTy, VK_LValue, OK_Ordinary, rbLoc);
}

// Use C++ overloaded-operator rules if either operand has record
// type.  The spec says to do this if either type is *overloadable*,
// but enum types can't declare subscript operators or conversion
// operators, so there's nothing interesting for overload resolution
// to do if there aren't any record types involved.
//
// ObjC pointers have their own subscripting logic that is not tied
// to overload resolution and so should not take this path.
if (getLangOpts().CPlusPlus &&
    (base->getType()->isRecordType() ||
     (!base->getType()->isObjCObjectPointerType() &&
      idx->getType()->isRecordType()))) {
  return CreateOverloadedArraySubscriptExpr(lbLoc, rbLoc, base, idx);
}

return CreateBuiltinArraySubscriptExpr(base, lbLoc, idx, rbLoc);
4180}

4182ExprResult Sema::ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
                                        Expr *LowerBound,
                                        SourceLocation ColonLoc, Expr *Length,
                                        SourceLocation RBLoc) {
if (Base->getType()->isPlaceholderType() &&
    !Base->getType()->isSpecificPlaceholderType(
        BuiltinType::OMPArraySection)) {
  ExprResult Result = CheckPlaceholderExpr(Base);
  if (Result.isInvalid())
    return ExprError();
  Base = Result.get();
}
if (LowerBound && LowerBound->getType()->isNonOverloadPlaceholderType()) {
  ExprResult Result = CheckPlaceholderExpr(LowerBound);
  if (Result.isInvalid())
    return ExprError();
  Result = DefaultLvalueConversion(Result.get());
  if (Result.isInvalid())
    return ExprError();
  LowerBound = Result.get();
}
if (Length && Length->getType()->isNonOverloadPlaceholderType()) {
  ExprResult Result = CheckPlaceholderExpr(Length);
  if (Result.isInvalid())
    return ExprError();
  Result = DefaultLvalueConversion(Result.get());
  if (Result.isInvalid())
    return ExprError();
  Length = Result.get();
}

// Build an unanalyzed expression if either operand is type-dependent.
if (Base->isTypeDependent() ||
    (LowerBound &&
     (LowerBound->isTypeDependent() || LowerBound->isValueDependent())) ||
    (Length && (Length->isTypeDependent() || Length->isValueDependent()))) {
  return new (Context)
      OMPArraySectionExpr(Base, LowerBound, Length, Context.DependentTy,
                          VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
}

// Perform default conversions.
QualType OriginalTy = OMPArraySectionExpr::getBaseOriginalType(Base);
QualType ResultTy;
if (OriginalTy->isAnyPointerType()) {
  ResultTy = OriginalTy->getPointeeType();
} else if (OriginalTy->isArrayType()) {
  ResultTy = OriginalTy->getAsArrayTypeUnsafe()->getElementType();
} else {
  return ExprError(
      Diag(Base->getExprLoc(), diag::err_omp_typecheck_section_value)
      << Base->getSourceRange());
}
// C99 6.5.2.1p1
if (LowerBound) {
  auto Res = PerformOpenMPImplicitIntegerConversion(LowerBound->getExprLoc(),
                                                    LowerBound);
  if (Res.isInvalid())
    return ExprError(Diag(LowerBound->getExprLoc(),
                          diag::err_omp_typecheck_section_not_integer)
                     << 0 << LowerBound->getSourceRange());
  LowerBound = Res.get();

  if (LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
      LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
    Diag(LowerBound->getExprLoc(), diag::warn_omp_section_is_char)
        << 0 << LowerBound->getSourceRange();
}
if (Length) {
  auto Res =
      PerformOpenMPImplicitIntegerConversion(Length->getExprLoc(), Length);
  if (Res.isInvalid())
    return ExprError(Diag(Length->getExprLoc(),
                          diag::err_omp_typecheck_section_not_integer)
                     << 1 << Length->getSourceRange());
  Length = Res.get();

  if (Length->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
      Length->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
    Diag(Length->getExprLoc(), diag::warn_omp_section_is_char)
        << 1 << Length->getSourceRange();
}

// C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
// C++ [expr.sub]p1: The type "T" shall be a completely-defined object
// type. Note that functions are not objects, and that (in C99 parlance)
// incomplete types are not object types.
if (ResultTy->isFunctionType()) {
  Diag(Base->getExprLoc(), diag::err_omp_section_function_type)
      << ResultTy << Base->getSourceRange();
  return ExprError();
}

if (RequireCompleteType(Base->getExprLoc(), ResultTy,
                        diag::err_omp_section_incomplete_type, Base))
  return ExprError();

if (LowerBound && !OriginalTy->isAnyPointerType()) {
  llvm::APSInt LowerBoundValue;
  if (LowerBound->EvaluateAsInt(LowerBoundValue, Context)) {
    // OpenMP 4.5, [2.4 Array Sections]
    // The array section must be a subset of the original array.
    if (LowerBoundValue.isNegative()) {
      Diag(LowerBound->getExprLoc(), diag::err_omp_section_not_subset_of_array)
          << LowerBound->getSourceRange();
      return ExprError();
    }
  }
}

if (Length) {
  llvm::APSInt LengthValue;
  if (Length->EvaluateAsInt(LengthValue, Context)) {
    // OpenMP 4.5, [2.4 Array Sections]
    // The length must evaluate to non-negative integers.
    if (LengthValue.isNegative()) {
      Diag(Length->getExprLoc(), diag::err_omp_section_length_negative)
          << LengthValue.toString(/*Radix=*/10, /*Signed=*/true)
          << Length->getSourceRange();
      return ExprError();
    }
  }
} else if (ColonLoc.isValid() &&
           (OriginalTy.isNull() || (!OriginalTy->isConstantArrayType() &&
                                    !OriginalTy->isVariableArrayType()))) {
  // OpenMP 4.5, [2.4 Array Sections]
  // When the size of the array dimension is not known, the length must be
  // specified explicitly.
  Diag(ColonLoc, diag::err_omp_section_length_undefined)
      << (!OriginalTy.isNull() && OriginalTy->isArrayType());
  return ExprError();
}

if (!Base->getType()->isSpecificPlaceholderType(
        BuiltinType::OMPArraySection)) {
  ExprResult Result = DefaultFunctionArrayLvalueConversion(Base);
  if (Result.isInvalid())
    return ExprError();
  Base = Result.get();
}
return new (Context)
    OMPArraySectionExpr(Base, LowerBound, Length, Context.OMPArraySectionTy,
                        VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
4325}

4327ExprResult
4328Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
                                    Expr *Idx, SourceLocation RLoc) {
Expr *LHSExp = Base;
Expr *RHSExp = Idx;

ExprValueKind VK = VK_LValue;
ExprObjectKind OK = OK_Ordinary;

// Per C++ core issue 1213, the result is an xvalue if either operand is
// a non-lvalue array, and an lvalue otherwise.
if (getLangOpts().CPlusPlus11 &&
    ((LHSExp->getType()->isArrayType() && !LHSExp->isLValue()) ||
     (RHSExp->getType()->isArrayType() && !RHSExp->isLValue())))
  VK = VK_XValue;

// Perform default conversions.
if (!LHSExp->getType()->getAs<VectorType>()) {
  ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
  if (Result.isInvalid())
    return ExprError();
  LHSExp = Result.get();
}
ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
if (Result.isInvalid())
  return ExprError();
RHSExp = Result.get();

QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();

// C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
// to the expression *((e1)+(e2)). This means the array "Base" may actually be
// in the subscript position. As a result, we need to derive the array base
// and index from the expression types.
Expr *BaseExpr, *IndexExpr;
QualType ResultType;
if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
  BaseExpr = LHSExp;
  IndexExpr = RHSExp;
  ResultType = Context.DependentTy;
} else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
  BaseExpr = LHSExp;
  IndexExpr = RHSExp;
  ResultType = PTy->getPointeeType();
} else if (const ObjCObjectPointerType *PTy =
             LHSTy->getAs<ObjCObjectPointerType>()) {
  BaseExpr = LHSExp;
  IndexExpr = RHSExp;

  // Use custom logic if this should be the pseudo-object subscript
  // expression.
  if (!LangOpts.isSubscriptPointerArithmetic())
    return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, nullptr,
                                        nullptr);

  ResultType = PTy->getPointeeType();
} else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
   // Handle the uncommon case of "123[Ptr]".
  BaseExpr = RHSExp;
  IndexExpr = LHSExp;
  ResultType = PTy->getPointeeType();
} else if (const ObjCObjectPointerType *PTy =
             RHSTy->getAs<ObjCObjectPointerType>()) {
   // Handle the uncommon case of "123[Ptr]".
  BaseExpr = RHSExp;
  IndexExpr = LHSExp;
  ResultType = PTy->getPointeeType();
  if (!LangOpts.isSubscriptPointerArithmetic()) {
    Diag(LLoc, diag::err_subscript_nonfragile_interface)
      << ResultType << BaseExpr->getSourceRange();
    return ExprError();
  }
} else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
  BaseExpr = LHSExp;    // vectors: V[123]
  IndexExpr = RHSExp;
  VK = LHSExp->getValueKind();
  if (VK != VK_RValue)
    OK = OK_VectorComponent;

  ResultType = VTy->getElementType();
  QualType BaseType = BaseExpr->getType();
  Qualifiers BaseQuals = BaseType.getQualifiers();
  Qualifiers MemberQuals = ResultType.getQualifiers();
  Qualifiers Combined = BaseQuals + MemberQuals;
  if (Combined != MemberQuals)
    ResultType = Context.getQualifiedType(ResultType, Combined);
} else if (LHSTy->isArrayType()) {
  // If we see an array that wasn't promoted by
  // DefaultFunctionArrayLvalueConversion, it must be an array that
  // wasn't promoted because of the C90 rule that doesn't
  // allow promoting non-lvalue arrays.  Warn, then
  // force the promotion here.
  Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
      LHSExp->getSourceRange();
  LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
                             CK_ArrayToPointerDecay).get();
  LHSTy = LHSExp->getType();

  BaseExpr = LHSExp;
  IndexExpr = RHSExp;
  ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
} else if (RHSTy->isArrayType()) {
  // Same as previous, except for 123[f().a] case
  Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
      RHSExp->getSourceRange();
  RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
                             CK_ArrayToPointerDecay).get();
  RHSTy = RHSExp->getType();

  BaseExpr = RHSExp;
  IndexExpr = LHSExp;
  ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
} else {
  return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
     << LHSExp->getSourceRange() << RHSExp->getSourceRange());
}
// C99 6.5.2.1p1
if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
  return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
                   << IndexExpr->getSourceRange());

if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
     IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
       && !IndexExpr->isTypeDependent())
  Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();

// C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
// C++ [expr.sub]p1: The type "T" shall be a completely-defined object
// type. Note that Functions are not objects, and that (in C99 parlance)
// incomplete types are not object types.
if (ResultType->isFunctionType()) {
  Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
    << ResultType << BaseExpr->getSourceRange();
  return ExprError();
}

if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) {
  // GNU extension: subscripting on pointer to void
  Diag(LLoc, diag::ext_gnu_subscript_void_type)
    << BaseExpr->getSourceRange();

  // C forbids expressions of unqualified void type from being l-values.
  // See IsCForbiddenLValueType.
  if (!ResultType.hasQualifiers()) VK = VK_RValue;
} else if (!ResultType->isDependentType() &&
    RequireCompleteType(LLoc, ResultType,
                        diag::err_subscript_incomplete_type, BaseExpr))
  return ExprError();

assert(VK == VK_RValue || LangOpts.CPlusPlus ||(static_cast <bool> (VK == VK_RValue || LangOpts.CPlusPlus
 || !ResultType.isCForbiddenLValueType()) ? void (0) : __assert_fail
 ("VK == VK_RValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4477, __extension__ __PRETTY_FUNCTION__))
       !ResultType.isCForbiddenLValueType())(static_cast <bool> (VK == VK_RValue || LangOpts.CPlusPlus
 || !ResultType.isCForbiddenLValueType()) ? void (0) : __assert_fail
 ("VK == VK_RValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4477, __extension__ __PRETTY_FUNCTION__));

return new (Context)
    ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc);
4481}

4483bool Sema::CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
                                ParmVarDecl *Param) {
if (Param->hasUnparsedDefaultArg()) {
  Diag(CallLoc,
       diag::err_use_of_default_argument_to_function_declared_later) <<
    FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
  Diag(UnparsedDefaultArgLocs[Param],
       diag::note_default_argument_declared_here);
  return true;
}

if (Param->hasUninstantiatedDefaultArg()) {
  Expr *UninstExpr = Param->getUninstantiatedDefaultArg();

  EnterExpressionEvaluationContext EvalContext(
      *this, ExpressionEvaluationContext::PotentiallyEvaluated, Param);

  // Instantiate the expression.
  //
  // FIXME: Pass in a correct Pattern argument, otherwise
  // getTemplateInstantiationArgs uses the lexical context of FD, e.g.
  //
  // template<typename T>
  // struct A {
  //   static int FooImpl();
  //
  //   template<typename Tp>
  //   // bug: default argument A<T>::FooImpl() is evaluated with 2-level
  //   // template argument list [[T], [Tp]], should be [[Tp]].
  //   friend A<Tp> Foo(int a);
  // };
  //
  // template<typename T>
  // A<T> Foo(int a = A<T>::FooImpl());
  MultiLevelTemplateArgumentList MutiLevelArgList
    = getTemplateInstantiationArgs(FD, nullptr, /*RelativeToPrimary=*/true);

  InstantiatingTemplate Inst(*this, CallLoc, Param,
                             MutiLevelArgList.getInnermost());
  if (Inst.isInvalid())
    return true;
  if (Inst.isAlreadyInstantiating()) {
    Diag(Param->getLocStart(), diag::err_recursive_default_argument) << FD;
    Param->setInvalidDecl();
    return true;
  }

  ExprResult Result;
  {
    // C++ [dcl.fct.default]p5:
    //   The names in the [default argument] expression are bound, and
    //   the semantic constraints are checked, at the point where the
    //   default argument expression appears.
    ContextRAII SavedContext(*this, FD);
    LocalInstantiationScope Local(*this);
    Result = SubstInitializer(UninstExpr, MutiLevelArgList,
                              /*DirectInit*/false);
  }
  if (Result.isInvalid())
    return true;

  // Check the expression as an initializer for the parameter.
  InitializedEntity Entity
    = InitializedEntity::InitializeParameter(Context, Param);
  InitializationKind Kind
    = InitializationKind::CreateCopy(Param->getLocation(),
           /*FIXME:EqualLoc*/UninstExpr->getLocStart());
  Expr *ResultE = Result.getAs<Expr>();

  InitializationSequence InitSeq(*this, Entity, Kind, ResultE);
  Result = InitSeq.Perform(*this, Entity, Kind, ResultE);
  if (Result.isInvalid())
    return true;

  Result = ActOnFinishFullExpr(Result.getAs<Expr>(),
                               Param->getOuterLocStart());
  if (Result.isInvalid())
    return true;

  // Remember the instantiated default argument.
  Param->setDefaultArg(Result.getAs<Expr>());
  if (ASTMutationListener *L = getASTMutationListener()) {
    L->DefaultArgumentInstantiated(Param);
  }
}

// If the default argument expression is not set yet, we are building it now.
if (!Param->hasInit()) {
  Diag(Param->getLocStart(), diag::err_recursive_default_argument) << FD;
  Param->setInvalidDecl();
  return true;
}

// If the default expression creates temporaries, we need to
// push them to the current stack of expression temporaries so they'll
// be properly destroyed.
// FIXME: We should really be rebuilding the default argument with new
// bound temporaries; see the comment in PR5810.
// We don't need to do that with block decls, though, because
// blocks in default argument expression can never capture anything.
if (auto Init = dyn_cast<ExprWithCleanups>(Param->getInit())) {
  // Set the "needs cleanups" bit regardless of whether there are
  // any explicit objects.
  Cleanup.setExprNeedsCleanups(Init->cleanupsHaveSideEffects());

  // Append all the objects to the cleanup list.  Right now, this
  // should always be a no-op, because blocks in default argument
  // expressions should never be able to capture anything.
  assert(!Init->getNumObjects() &&(static_cast <bool> (!Init->getNumObjects() &&
 "default argument expression has capturing blocks?") ? void (
0) : __assert_fail ("!Init->getNumObjects() && \"default argument expression has capturing blocks?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4592, __extension__ __PRETTY_FUNCTION__))
         "default argument expression has capturing blocks?")(static_cast <bool> (!Init->getNumObjects() &&
 "default argument expression has capturing blocks?") ? void (
0) : __assert_fail ("!Init->getNumObjects() && \"default argument expression has capturing blocks?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4592, __extension__ __PRETTY_FUNCTION__));
}

// We already type-checked the argument, so we know it works. 
// Just mark all of the declarations in this potentially-evaluated expression
// as being "referenced".
MarkDeclarationsReferencedInExpr(Param->getDefaultArg(),
                                 /*SkipLocalVariables=*/true);
return false;
4601}

4603ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
                                      FunctionDecl *FD, ParmVarDecl *Param) {
if (CheckCXXDefaultArgExpr(CallLoc, FD, Param))
  return ExprError();
return CXXDefaultArgExpr::Create(Context, CallLoc, Param);
4608}

4610Sema::VariadicCallType
4611Sema::getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto,
                        Expr *Fn) {
if (Proto && Proto->isVariadic()) {
  if (dyn_cast_or_null<CXXConstructorDecl>(FDecl))
    return VariadicConstructor;
  else if (Fn && Fn->getType()->isBlockPointerType())
    return VariadicBlock;
  else if (FDecl) {
    if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
      if (Method->isInstance())
        return VariadicMethod;
  } else if (Fn && Fn->getType() == Context.BoundMemberTy)
    return VariadicMethod;
  return VariadicFunction;
}
return VariadicDoesNotApply;
4627}

4629namespace {
4630class FunctionCallCCC : public FunctionCallFilterCCC {
4631public:
FunctionCallCCC(Sema &SemaRef, const IdentifierInfo *FuncName,
                unsigned NumArgs, MemberExpr *ME)
    : FunctionCallFilterCCC(SemaRef, NumArgs, false, ME),
      FunctionName(FuncName) {}

bool ValidateCandidate(const TypoCorrection &candidate) override {
  if (!candidate.getCorrectionSpecifier() ||
      candidate.getCorrectionAsIdentifierInfo() != FunctionName) {
    return false;
  }

  return FunctionCallFilterCCC::ValidateCandidate(candidate);
}

4646private:
const IdentifierInfo *const FunctionName;
4648};
4649}

4651static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn,
                                             FunctionDecl *FDecl,
                                             ArrayRef<Expr *> Args) {
MemberExpr *ME = dyn_cast<MemberExpr>(Fn);
DeclarationName FuncName = FDecl->getDeclName();
SourceLocation NameLoc = ME ? ME->getMemberLoc() : Fn->getLocStart();

if (TypoCorrection Corrected = S.CorrectTypo(
        DeclarationNameInfo(FuncName, NameLoc), Sema::LookupOrdinaryName,
        S.getScopeForContext(S.CurContext), nullptr,
        llvm::make_unique<FunctionCallCCC>(S, FuncName.getAsIdentifierInfo(),
                                           Args.size(), ME),
        Sema::CTK_ErrorRecovery)) {
  if (NamedDecl *ND = Corrected.getFoundDecl()) {
    if (Corrected.isOverloaded()) {
      OverloadCandidateSet OCS(NameLoc, OverloadCandidateSet::CSK_Normal);
      OverloadCandidateSet::iterator Best;
      for (NamedDecl *CD : Corrected) {
        if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
          S.AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none), Args,
                                 OCS);
      }
      switch (OCS.BestViableFunction(S, NameLoc, Best)) {
      case OR_Success:
        ND = Best->FoundDecl;
        Corrected.setCorrectionDecl(ND);
        break;
      default:
        break;
      }
    }
    ND = ND->getUnderlyingDecl();
    if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND))
      return Corrected;
  }
}
return TypoCorrection();
4688}

4690/// ConvertArgumentsForCall - Converts the arguments specified in
4691/// Args/NumArgs to the parameter types of the function FDecl with
4692/// function prototype Proto. Call is the call expression itself, and
4693/// Fn is the function expression. For a C++ member function, this
4694/// routine does not attempt to convert the object argument. Returns
4695/// true if the call is ill-formed.
4696bool
4697Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
                            FunctionDecl *FDecl,
                            const FunctionProtoType *Proto,
                            ArrayRef<Expr *> Args,
                            SourceLocation RParenLoc,
                            bool IsExecConfig) {
// Bail out early if calling a builtin with custom typechecking.
if (FDecl)
  if (unsigned ID = FDecl->getBuiltinID())
    if (Context.BuiltinInfo.hasCustomTypechecking(ID))
      return false;

// C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
// assignment, to the types of the corresponding parameter, ...
unsigned NumParams = Proto->getNumParams();
bool Invalid = false;
unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumParams;
unsigned FnKind = Fn->getType()->isBlockPointerType()
                     ? 1 /* block */
                     : (IsExecConfig ? 3 /* kernel function (exec config) */
                                     : 0 /* function */);

// If too few arguments are available (and we don't have default
// arguments for the remaining parameters), don't make the call.
if (Args.size() < NumParams) {
  if (Args.size() < MinArgs) {
    TypoCorrection TC;
    if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
      unsigned diag_id =
          MinArgs == NumParams && !Proto->isVariadic()
              ? diag::err_typecheck_call_too_few_args_suggest
              : diag::err_typecheck_call_too_few_args_at_least_suggest;
      diagnoseTypo(TC, PDiag(diag_id) << FnKind << MinArgs
                                      << static_cast<unsigned>(Args.size())
                                      << TC.getCorrectionRange());
    } else if (MinArgs == 1 && FDecl && FDecl->getParamDecl(0)->getDeclName())
      Diag(RParenLoc,
           MinArgs == NumParams && !Proto->isVariadic()
               ? diag::err_typecheck_call_too_few_args_one
               : diag::err_typecheck_call_too_few_args_at_least_one)
          << FnKind << FDecl->getParamDecl(0) << Fn->getSourceRange();
    else
      Diag(RParenLoc, MinArgs == NumParams && !Proto->isVariadic()
                          ? diag::err_typecheck_call_too_few_args
                          : diag::err_typecheck_call_too_few_args_at_least)
          << FnKind << MinArgs << static_cast<unsigned>(Args.size())
          << Fn->getSourceRange();

    // Emit the location of the prototype.
    if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
      Diag(FDecl->getLocStart(), diag::note_callee_decl)
        << FDecl;

    return true;
  }
  Call->setNumArgs(Context, NumParams);
}

// If too many are passed and not variadic, error on the extras and drop
// them.
if (Args.size() > NumParams) {
  if (!Proto->isVariadic()) {
    TypoCorrection TC;
    if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
      unsigned diag_id =
          MinArgs == NumParams && !Proto->isVariadic()
              ? diag::err_typecheck_call_too_many_args_suggest
              : diag::err_typecheck_call_too_many_args_at_most_suggest;
      diagnoseTypo(TC, PDiag(diag_id) << FnKind << NumParams
                                      << static_cast<unsigned>(Args.size())
                                      << TC.getCorrectionRange());
    } else if (NumParams == 1 && FDecl &&
               FDecl->getParamDecl(0)->getDeclName())
      Diag(Args[NumParams]->getLocStart(),
           MinArgs == NumParams
               ? diag::err_typecheck_call_too_many_args_one
               : diag::err_typecheck_call_too_many_args_at_most_one)
          << FnKind << FDecl->getParamDecl(0)
          << static_cast<unsigned>(Args.size()) << Fn->getSourceRange()
          << SourceRange(Args[NumParams]->getLocStart(),
                         Args.back()->getLocEnd());
    else
      Diag(Args[NumParams]->getLocStart(),
           MinArgs == NumParams
               ? diag::err_typecheck_call_too_many_args
               : diag::err_typecheck_call_too_many_args_at_most)
          << FnKind << NumParams << static_cast<unsigned>(Args.size())
          << Fn->getSourceRange()
          << SourceRange(Args[NumParams]->getLocStart(),
                         Args.back()->getLocEnd());

    // Emit the location of the prototype.
    if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
      Diag(FDecl->getLocStart(), diag::note_callee_decl)
        << FDecl;
    
    // This deletes the extra arguments.
    Call->setNumArgs(Context, NumParams);
    return true;
  }
}
SmallVector<Expr *, 8> AllArgs;
VariadicCallType CallType = getVariadicCallType(FDecl, Proto, Fn);

Invalid = GatherArgumentsForCall(Call->getLocStart(), FDecl,
                                 Proto, 0, Args, AllArgs, CallType);
if (Invalid)
  return true;
unsigned TotalNumArgs = AllArgs.size();
for (unsigned i = 0; i < TotalNumArgs; ++i)
  Call->setArg(i, AllArgs[i]);

return false;
4810}

4812bool Sema::GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
                                const FunctionProtoType *Proto,
                                unsigned FirstParam, ArrayRef<Expr *> Args,
                                SmallVectorImpl<Expr *> &AllArgs,
                                VariadicCallType CallType, bool AllowExplicit,
                                bool IsListInitialization) {
unsigned NumParams = Proto->getNumParams();
bool Invalid = false;
size_t ArgIx = 0;
// Continue to check argument types (even if we have too few/many args).
for (unsigned i = FirstParam; i < NumParams; i++) {
  QualType ProtoArgType = Proto->getParamType(i);

  Expr *Arg;
  ParmVarDecl *Param = FDecl ? FDecl->getParamDecl(i) : nullptr;
  if (ArgIx < Args.size()) {
    Arg = Args[ArgIx++];

    if (RequireCompleteType(Arg->getLocStart(),
                            ProtoArgType,
                            diag::err_call_incomplete_argument, Arg))
      return true;

    // Strip the unbridged-cast placeholder expression off, if applicable.
    bool CFAudited = false;
    if (Arg->getType() == Context.ARCUnbridgedCastTy &&
        FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
        (!Param || !Param->hasAttr<CFConsumedAttr>()))
      Arg = stripARCUnbridgedCast(Arg);
    else if (getLangOpts().ObjCAutoRefCount &&
             FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
             (!Param || !Param->hasAttr<CFConsumedAttr>()))
      CFAudited = true;

    if (Proto->getExtParameterInfo(i).isNoEscape())
      if (auto *BE = dyn_cast<BlockExpr>(Arg->IgnoreParenNoopCasts(Context)))
        BE->getBlockDecl()->setDoesNotEscape();

    InitializedEntity Entity =
        Param ? InitializedEntity::InitializeParameter(Context, Param,
                                                       ProtoArgType)
              : InitializedEntity::InitializeParameter(
                    Context, ProtoArgType, Proto->isParamConsumed(i));

    // Remember that parameter belongs to a CF audited API.
    if (CFAudited)
      Entity.setParameterCFAudited();

    ExprResult ArgE = PerformCopyInitialization(
        Entity, SourceLocation(), Arg, IsListInitialization, AllowExplicit);
    if (ArgE.isInvalid())
      return true;

    Arg = ArgE.getAs<Expr>();
  } else {
    assert(Param && "can't use default arguments without a known callee")(static_cast <bool> (Param && "can't use default arguments without a known callee"
) ? void (0) : __assert_fail ("Param && \"can't use default arguments without a known callee\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 4867, __extension__ __PRETTY_FUNCTION__));

    ExprResult ArgExpr =
      BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
    if (ArgExpr.isInvalid())
      return true;

    Arg = ArgExpr.getAs<Expr>();
  }

  // Check for array bounds violations for each argument to the call. This
  // check only triggers warnings when the argument isn't a more complex Expr
  // with its own checking, such as a BinaryOperator.
  CheckArrayAccess(Arg);

  // Check for violations of C99 static array rules (C99 6.7.5.3p7).
  CheckStaticArrayArgument(CallLoc, Param, Arg);

  AllArgs.push_back(Arg);
}

// If this is a variadic call, handle args passed through "...".
if (CallType != VariadicDoesNotApply) {
  // Assume that extern "C" functions with variadic arguments that
  // return __unknown_anytype aren't *really* variadic.
  if (Proto->getReturnType() == Context.UnknownAnyTy && FDecl &&
      FDecl->isExternC()) {
    for (Expr *A : Args.slice(ArgIx)) {
      QualType paramType; // ignored
      ExprResult arg = checkUnknownAnyArg(CallLoc, A, paramType);
      Invalid |= arg.isInvalid();
      AllArgs.push_back(arg.get());
    }

  // Otherwise do argument promotion, (C99 6.5.2.2p7).
  } else {
    for (Expr *A : Args.slice(ArgIx)) {
      ExprResult Arg = DefaultVariadicArgumentPromotion(A, CallType, FDecl);
      Invalid |= Arg.isInvalid();
      AllArgs.push_back(Arg.get());
    }
  }

  // Check for array bounds violations.
  for (Expr *A : Args.slice(ArgIx))
    CheckArrayAccess(A);
}
return Invalid;
4915}

4917static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
if (DecayedTypeLoc DTL = TL.getAs<DecayedTypeLoc>())
  TL = DTL.getOriginalLoc();
if (ArrayTypeLoc ATL = TL.getAs<ArrayTypeLoc>())
  S.Diag(PVD->getLocation(), diag::note_callee_static_array)
    << ATL.getLocalSourceRange();
4924}

4926/// CheckStaticArrayArgument - If the given argument corresponds to a static
4927/// array parameter, check that it is non-null, and that if it is formed by
4928/// array-to-pointer decay, the underlying array is sufficiently large.
4929///
4930/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
4931/// array type derivation, then for each call to the function, the value of the
4932/// corresponding actual argument shall provide access to the first element of
4933/// an array with at least as many elements as specified by the size expression.
4934void
4935Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
                             ParmVarDecl *Param,
                             const Expr *ArgExpr) {
// Static array parameters are not supported in C++.
if (!Param || getLangOpts().CPlusPlus)
  return;

QualType OrigTy = Param->getOriginalType();

const ArrayType *AT = Context.getAsArrayType(OrigTy);
if (!AT || AT->getSizeModifier() != ArrayType::Static)
  return;

if (ArgExpr->isNullPointerConstant(Context,
                                   Expr::NPC_NeverValueDependent)) {
  Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
  DiagnoseCalleeStaticArrayParam(*this, Param);
  return;
}

const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
if (!CAT)
  return;

const ConstantArrayType *ArgCAT =
  Context.getAsConstantArrayType(ArgExpr->IgnoreParenImpCasts()->getType());
if (!ArgCAT)
  return;

if (ArgCAT->getSize().ult(CAT->getSize())) {
  Diag(CallLoc, diag::warn_static_array_too_small)
    << ArgExpr->getSourceRange()
    << (unsigned) ArgCAT->getSize().getZExtValue()
    << (unsigned) CAT->getSize().getZExtValue();
  DiagnoseCalleeStaticArrayParam(*this, Param);
}
4971}

4973/// Given a function expression of unknown-any type, try to rebuild it
4974/// to have a function type.
4975static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);

4977/// Is the given type a placeholder that we need to lower out
4978/// immediately during argument processing?
4979static bool isPlaceholderToRemoveAsArg(QualType type) {
// Placeholders are never sugared.
const BuiltinType *placeholder = dyn_cast<BuiltinType>(type);
if (!placeholder) return false;

switch (placeholder->getKind()) {
// Ignore all the non-placeholder types.
4986#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id:
4988#include "clang/Basic/OpenCLImageTypes.def"
4989#define PLACEHOLDER_TYPE(ID, SINGLETON_ID)
4990#define BUILTIN_TYPE(ID, SINGLETON_ID) case BuiltinType::ID:
4991#include "clang/AST/BuiltinTypes.def"
  return false;

// We cannot lower out overload sets; they might validly be resolved
// by the call machinery.
case BuiltinType::Overload:
  return false;

// Unbridged casts in ARC can be handled in some call positions and
// should be left in place.
case BuiltinType::ARCUnbridgedCast:
  return false;

// Pseudo-objects should be converted as soon as possible.
case BuiltinType::PseudoObject:
  return true;

// The debugger mode could theoretically but currently does not try
// to resolve unknown-typed arguments based on known parameter types.
case BuiltinType::UnknownAny:
  return true;

// These are always invalid as call arguments and should be reported.
case BuiltinType::BoundMember:
case BuiltinType::BuiltinFn:
case BuiltinType::OMPArraySection:
  return true;

}
llvm_unreachable("bad builtin type kind")::llvm::llvm_unreachable_internal("bad builtin type kind", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5020);
5021}

5023/// Check an argument list for placeholders that we won't try to
5024/// handle later.
5025static bool checkArgsForPlaceholders(Sema &S, MultiExprArg args) {
// Apply this processing to all the arguments at once instead of
// dying at the first failure.
bool hasInvalid = false;
for (size_t i = 0, e = args.size(); i != e; i++) {
  if (isPlaceholderToRemoveAsArg(args[i]->getType())) {
    ExprResult result = S.CheckPlaceholderExpr(args[i]);
    if (result.isInvalid()) hasInvalid = true;
    else args[i] = result.get();
  } else if (hasInvalid) {
    (void)S.CorrectDelayedTyposInExpr(args[i]);
  }
}
return hasInvalid;
5039}

5041/// If a builtin function has a pointer argument with no explicit address
5042/// space, then it should be able to accept a pointer to any address
5043/// space as input.  In order to do this, we need to replace the
5044/// standard builtin declaration with one that uses the same address space
5045/// as the call.
5046///
5047/// \returns nullptr If this builtin is not a candidate for a rewrite i.e.
5048///                  it does not contain any pointer arguments without
5049///                  an address space qualifer.  Otherwise the rewritten
5050///                  FunctionDecl is returned.
5051/// TODO: Handle pointer return types.
5052static FunctionDecl *rewriteBuiltinFunctionDecl(Sema *Sema, ASTContext &Context,
                                              const FunctionDecl *FDecl,
                                              MultiExprArg ArgExprs) {

QualType DeclType = FDecl->getType();
const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(DeclType);

if (!Context.BuiltinInfo.hasPtrArgsOrResult(FDecl->getBuiltinID()) ||
    !FT || FT->isVariadic() || ArgExprs.size() != FT->getNumParams())
  return nullptr;

bool NeedsNewDecl = false;
unsigned i = 0;
SmallVector<QualType, 8> OverloadParams;

for (QualType ParamType : FT->param_types()) {

  // Convert array arguments to pointer to simplify type lookup.
  ExprResult ArgRes =
      Sema->DefaultFunctionArrayLvalueConversion(ArgExprs[i++]);
  if (ArgRes.isInvalid())
    return nullptr;
  Expr *Arg = ArgRes.get();
  QualType ArgType = Arg->getType();
  if (!ParamType->isPointerType() ||
      ParamType.getQualifiers().hasAddressSpace() ||
      !ArgType->isPointerType() ||
      !ArgType->getPointeeType().getQualifiers().hasAddressSpace()) {
    OverloadParams.push_back(ParamType);
    continue;
  }

  NeedsNewDecl = true;
  LangAS AS = ArgType->getPointeeType().getAddressSpace();

  QualType PointeeType = ParamType->getPointeeType();
  PointeeType = Context.getAddrSpaceQualType(PointeeType, AS);
  OverloadParams.push_back(Context.getPointerType(PointeeType));
}

if (!NeedsNewDecl)
  return nullptr;

FunctionProtoType::ExtProtoInfo EPI;
QualType OverloadTy = Context.getFunctionType(FT->getReturnType(),
                                              OverloadParams, EPI);
DeclContext *Parent = Context.getTranslationUnitDecl();
FunctionDecl *OverloadDecl = FunctionDecl::Create(Context, Parent,
                                                  FDecl->getLocation(),
                                                  FDecl->getLocation(),
                                                  FDecl->getIdentifier(),
                                                  OverloadTy,
                                                  /*TInfo=*/nullptr,
                                                  SC_Extern, false,
                                                  /*hasPrototype=*/true);
SmallVector<ParmVarDecl*, 16> Params;
FT = cast<FunctionProtoType>(OverloadTy);
for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
  QualType ParamType = FT->getParamType(i);
  ParmVarDecl *Parm =
      ParmVarDecl::Create(Context, OverloadDecl, SourceLocation(),
                              SourceLocation(), nullptr, ParamType,
                              /*TInfo=*/nullptr, SC_None, nullptr);
  Parm->setScopeInfo(0, i);
  Params.push_back(Parm);
}
OverloadDecl->setParams(Params);
return OverloadDecl;
5120}

5122static void checkDirectCallValidity(Sema &S, const Expr *Fn,
                                  FunctionDecl *Callee,
                                  MultiExprArg ArgExprs) {
// `Callee` (when called with ArgExprs) may be ill-formed. enable_if (and
// similar attributes) really don't like it when functions are called with an
// invalid number of args.
if (S.TooManyArguments(Callee->getNumParams(), ArgExprs.size(),
                       /*PartialOverloading=*/false) &&
    !Callee->isVariadic())
  return;
if (Callee->getMinRequiredArguments() > ArgExprs.size())
  return;

if (const EnableIfAttr *Attr = S.CheckEnableIf(Callee, ArgExprs, true)) {
  S.Diag(Fn->getLocStart(),
         isa<CXXMethodDecl>(Callee)
             ? diag::err_ovl_no_viable_member_function_in_call
             : diag::err_ovl_no_viable_function_in_call)
      << Callee << Callee->getSourceRange();
  S.Diag(Callee->getLocation(),
         diag::note_ovl_candidate_disabled_by_function_cond_attr)
      << Attr->getCond()->getSourceRange() << Attr->getMessage();
  return;
}
5146}

5148static bool enclosingClassIsRelatedToClassInWhichMembersWereFound(
  const UnresolvedMemberExpr *const UME, Sema &S) {

const auto GetFunctionLevelDCIfCXXClass =
    [](Sema &S) -> const CXXRecordDecl * {
  const DeclContext *const DC = S.getFunctionLevelDeclContext();
  if (!DC || !DC->getParent())
    return nullptr;

  // If the call to some member function was made from within a member
  // function body 'M' return return 'M's parent.
  if (const auto *MD = dyn_cast<CXXMethodDecl>(DC))
    return MD->getParent()->getCanonicalDecl();
  // else the call was made from within a default member initializer of a
  // class, so return the class.
  if (const auto *RD = dyn_cast<CXXRecordDecl>(DC))
    return RD->getCanonicalDecl();
  return nullptr;
};
// If our DeclContext is neither a member function nor a class (in the
// case of a lambda in a default member initializer), we can't have an
// enclosing 'this'.

const CXXRecordDecl *const CurParentClass = GetFunctionLevelDCIfCXXClass(S);
if (!CurParentClass)
  return false;

// The naming class for implicit member functions call is the class in which
// name lookup starts.
const CXXRecordDecl *const NamingClass =
    UME->getNamingClass()->getCanonicalDecl();
assert(NamingClass && "Must have naming class even for implicit access")(static_cast <bool> (NamingClass && "Must have naming class even for implicit access"
) ? void (0) : __assert_fail ("NamingClass && \"Must have naming class even for implicit access\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5179, __extension__ __PRETTY_FUNCTION__));

// If the unresolved member functions were found in a 'naming class' that is
// related (either the same or derived from) to the class that contains the
// member function that itself contained the implicit member access.

return CurParentClass == NamingClass ||
       CurParentClass->isDerivedFrom(NamingClass);
5187}

5189static void
5190tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
  Sema &S, const UnresolvedMemberExpr *const UME, SourceLocation CallLoc) {

if (!UME)
  return;

LambdaScopeInfo *const CurLSI = S.getCurLambda();
// Only try and implicitly capture 'this' within a C++ Lambda if it hasn't
// already been captured, or if this is an implicit member function call (if
// it isn't, an attempt to capture 'this' should already have been made).
if (!CurLSI || CurLSI->ImpCaptureStyle == CurLSI->ImpCap_None ||
    !UME->isImplicitAccess() || CurLSI->isCXXThisCaptured())
  return;

// Check if the naming class in which the unresolved members were found is
// related (same as or is a base of) to the enclosing class.

if (!enclosingClassIsRelatedToClassInWhichMembersWereFound(UME, S))
  return;

      
DeclContext *EnclosingFunctionCtx = S.CurContext->getParent()->getParent();
// If the enclosing function is not dependent, then this lambda is
// capture ready, so if we can capture this, do so.
if (!EnclosingFunctionCtx->isDependentContext()) {
  // If the current lambda and all enclosing lambdas can capture 'this' -
  // then go ahead and capture 'this' (since our unresolved overload set
  // contains at least one non-static member function).
  if (!S.CheckCXXThisCapture(CallLoc, /*Explcit*/ false, /*Diagnose*/ false))
    S.CheckCXXThisCapture(CallLoc);
} else if (S.CurContext->isDependentContext()) {
  // ... since this is an implicit member reference, that might potentially
  // involve a 'this' capture, mark 'this' for potential capture in
  // enclosing lambdas.
  if (CurLSI->ImpCaptureStyle != CurLSI->ImpCap_None)
    CurLSI->addPotentialThisCapture(CallLoc);
}
5227}

5229/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
5230/// This provides the location of the left/right parens and a list of comma
5231/// locations.
5232ExprResult Sema::ActOnCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
                             MultiExprArg ArgExprs, SourceLocation RParenLoc,
                             Expr *ExecConfig, bool IsExecConfig) {
// Since this might be a postfix expression, get rid of ParenListExprs.
ExprResult Result = MaybeConvertParenListExprToParenExpr(Scope, Fn);
if (Result.isInvalid()) return ExprError();
Fn = Result.get();

if (checkArgsForPlaceholders(*this, ArgExprs))
  return ExprError();

if (getLangOpts().CPlusPlus) {
  // If this is a pseudo-destructor expression, build the call immediately.
  if (isa<CXXPseudoDestructorExpr>(Fn)) {
    if (!ArgExprs.empty()) {
      // Pseudo-destructor calls should not have any arguments.
      Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
          << FixItHint::CreateRemoval(
                 SourceRange(ArgExprs.front()->getLocStart(),
                             ArgExprs.back()->getLocEnd()));
    }

    return new (Context)
        CallExpr(Context, Fn, None, Context.VoidTy, VK_RValue, RParenLoc);
  }
  if (Fn->getType() == Context.PseudoObjectTy) {
    ExprResult result = CheckPlaceholderExpr(Fn);
    if (result.isInvalid()) return ExprError();
    Fn = result.get();
  }

  // Determine whether this is a dependent call inside a C++ template,
  // in which case we won't do any semantic analysis now.
  bool Dependent = false;
  if (Fn->isTypeDependent())
    Dependent = true;
  else if (Expr::hasAnyTypeDependentArguments(ArgExprs))
    Dependent = true;

  if (Dependent) {
    if (ExecConfig) {
      return new (Context) CUDAKernelCallExpr(
          Context, Fn, cast<CallExpr>(ExecConfig), ArgExprs,
          Context.DependentTy, VK_RValue, RParenLoc);
    } else {

     tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
          *this, dyn_cast<UnresolvedMemberExpr>(Fn->IgnoreParens()),
          Fn->getLocStart());

      return new (Context) CallExpr(
          Context, Fn, ArgExprs, Context.DependentTy, VK_RValue, RParenLoc);
    }
  }

  // Determine whether this is a call to an object (C++ [over.call.object]).
  if (Fn->getType()->isRecordType())
    return BuildCallToObjectOfClassType(Scope, Fn, LParenLoc, ArgExprs,
                                        RParenLoc);

  if (Fn->getType() == Context.UnknownAnyTy) {
    ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
    if (result.isInvalid()) return ExprError();
    Fn = result.get();
  }

  if (Fn->getType() == Context.BoundMemberTy) {
    return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
                                     RParenLoc);
  }
}

// Check for overloaded calls.  This can happen even in C due to extensions.
if (Fn->getType() == Context.OverloadTy) {
  OverloadExpr::FindResult find = OverloadExpr::find(Fn);

  // We aren't supposed to apply this logic if there's an '&' involved.
  if (!find.HasFormOfMemberPointer) {
    if (Expr::hasAnyTypeDependentArguments(ArgExprs))
      return new (Context) CallExpr(
          Context, Fn, ArgExprs, Context.DependentTy, VK_RValue, RParenLoc);
    OverloadExpr *ovl = find.Expression;
    if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(ovl))
      return BuildOverloadedCallExpr(
          Scope, Fn, ULE, LParenLoc, ArgExprs, RParenLoc, ExecConfig,
          /*AllowTypoCorrection=*/true, find.IsAddressOfOperand);
    return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
                                     RParenLoc);
  }
}

// If we're directly calling a function, get the appropriate declaration.
if (Fn->getType() == Context.UnknownAnyTy) {
  ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
  if (result.isInvalid()) return ExprError();
  Fn = result.get();
}

Expr *NakedFn = Fn->IgnoreParens();

bool CallingNDeclIndirectly = false;
NamedDecl *NDecl = nullptr;
if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn)) {
  if (UnOp->getOpcode() == UO_AddrOf) {
    CallingNDeclIndirectly = true;
    NakedFn = UnOp->getSubExpr()->IgnoreParens();
  }
}

if (isa<DeclRefExpr>(NakedFn)) {
  NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();

  FunctionDecl *FDecl = dyn_cast<FunctionDecl>(NDecl);
  if (FDecl && FDecl->getBuiltinID()) {
    // Rewrite the function decl for this builtin by replacing parameters
    // with no explicit address space with the address space of the arguments
    // in ArgExprs.
    if ((FDecl =
             rewriteBuiltinFunctionDecl(this, Context, FDecl, ArgExprs))) {
      NDecl = FDecl;
      Fn = DeclRefExpr::Create(
          Context, FDecl->getQualifierLoc(), SourceLocation(), FDecl, false,
          SourceLocation(), FDecl->getType(), Fn->getValueKind(), FDecl);
    }
  }
} else if (isa<MemberExpr>(NakedFn))
  NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();

if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(NDecl)) {
  if (CallingNDeclIndirectly &&
      !checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
                                         Fn->getLocStart()))
    return ExprError();

  if (getLangOpts().OpenCL && checkOpenCLDisabledDecl(*FD, *Fn))
    return ExprError();

  checkDirectCallValidity(*this, Fn, FD, ArgExprs);
}

return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs, RParenLoc,
                             ExecConfig, IsExecConfig);
5374}

5376/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
5377///
5378/// __builtin_astype( value, dst type )
5379///
5380ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
                               SourceLocation BuiltinLoc,
                               SourceLocation RParenLoc) {
ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
QualType DstTy = GetTypeFromParser(ParsedDestTy);
QualType SrcTy = E->getType();
if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
  return ExprError(Diag(BuiltinLoc,
                        diag::err_invalid_astype_of_different_size)
                   << DstTy
                   << SrcTy
                   << E->getSourceRange());
return new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc, RParenLoc);
5394}

5396/// ActOnConvertVectorExpr - create a new convert-vector expression from the
5397/// provided arguments.
5398///
5399/// __builtin_convertvector( value, dst type )
5400///
5401ExprResult Sema::ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
                                      SourceLocation BuiltinLoc,
                                      SourceLocation RParenLoc) {
TypeSourceInfo *TInfo;
GetTypeFromParser(ParsedDestTy, &TInfo);
return SemaConvertVectorExpr(E, TInfo, BuiltinLoc, RParenLoc);
5407}

5409/// BuildResolvedCallExpr - Build a call to a resolved expression,
5410/// i.e. an expression not of \p OverloadTy.  The expression should
5411/// unary-convert to an expression of function-pointer or
5412/// block-pointer type.
5413///
5414/// \param NDecl the declaration being called, if available
5415ExprResult
5416Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
                          SourceLocation LParenLoc,
                          ArrayRef<Expr *> Args,
                          SourceLocation RParenLoc,
                          Expr *Config, bool IsExecConfig) {
FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);

// Functions with 'interrupt' attribute cannot be called directly.
if (FDecl && FDecl->hasAttr<AnyX86InterruptAttr>()) {
  Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_called);
  return ExprError();
}

// Interrupt handlers don't save off the VFP regs automatically on ARM,
// so there's some risk when calling out to non-interrupt handler functions
// that the callee might not preserve them. This is easy to diagnose here,
// but can be very challenging to debug.
if (auto *Caller = getCurFunctionDecl())
  if (Caller->hasAttr<ARMInterruptAttr>()) {
    bool VFP = Context.getTargetInfo().hasFeature("vfp");
    if (VFP && (!FDecl || !FDecl->hasAttr<ARMInterruptAttr>()))
      Diag(Fn->getExprLoc(), diag::warn_arm_interrupt_calling_convention);
  }

// Promote the function operand.
// We special-case function promotion here because we only allow promoting
// builtin functions to function pointers in the callee of a call.
ExprResult Result;
if (BuiltinID &&
    Fn->getType()->isSpecificBuiltinType(BuiltinType::BuiltinFn)) {
  Result = ImpCastExprToType(Fn, Context.getPointerType(FDecl->getType()),
                             CK_BuiltinFnToFnPtr).get();
} else {
  Result = CallExprUnaryConversions(Fn);
}
if (Result.isInvalid())
  return ExprError();
Fn = Result.get();

// Make the call expr early, before semantic checks.  This guarantees cleanup
// of arguments and function on error.
CallExpr *TheCall;
if (Config)
  TheCall = new (Context) CUDAKernelCallExpr(Context, Fn,
                                             cast<CallExpr>(Config), Args,
                                             Context.BoolTy, VK_RValue,
                                             RParenLoc);
else
  TheCall = new (Context) CallExpr(Context, Fn, Args, Context.BoolTy,
                                   VK_RValue, RParenLoc);

if (!getLangOpts().CPlusPlus) {
  // C cannot always handle TypoExpr nodes in builtin calls and direct
  // function calls as their argument checking don't necessarily handle
  // dependent types properly, so make sure any TypoExprs have been
  // dealt with.
  ExprResult Result = CorrectDelayedTyposInExpr(TheCall);
  if (!Result.isUsable()) return ExprError();
  TheCall = dyn_cast<CallExpr>(Result.get());
  if (!TheCall) return Result;
  Args = llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs());
}

// Bail out early if calling a builtin with custom typechecking.
if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
  return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);

retry:
const FunctionType *FuncT;
if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
  // C99 6.5.2.2p1 - "The expression that denotes the called function shall
  // have type pointer to function".
  FuncT = PT->getPointeeType()->getAs<FunctionType>();
  if (!FuncT)
    return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
                       << Fn->getType() << Fn->getSourceRange());
} else if (const BlockPointerType *BPT =
             Fn->getType()->getAs<BlockPointerType>()) {
  FuncT = BPT->getPointeeType()->castAs<FunctionType>();
} else {
  // Handle calls to expressions of unknown-any type.
  if (Fn->getType() == Context.UnknownAnyTy) {
    ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
    if (rewrite.isInvalid()) return ExprError();
    Fn = rewrite.get();
    TheCall->setCallee(Fn);
    goto retry;
  }

  return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
    << Fn->getType() << Fn->getSourceRange());
}

if (getLangOpts().CUDA) {
  if (Config) {
    // CUDA: Kernel calls must be to global functions
    if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
      return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
          << FDecl << Fn->getSourceRange());

    // CUDA: Kernel function must have 'void' return type
    if (!FuncT->getReturnType()->isVoidType())
      return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
          << Fn->getType() << Fn->getSourceRange());
  } else {
    // CUDA: Calls to global functions must be configured
    if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
      return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
          << FDecl << Fn->getSourceRange());
  }
}

// Check for a valid return type
if (CheckCallReturnType(FuncT->getReturnType(), Fn->getLocStart(), TheCall,
                        FDecl))
  return ExprError();

// We know the result type of the call, set it.
TheCall->setType(FuncT->getCallResultType(Context));
TheCall->setValueKind(Expr::getValueKindForType(FuncT->getReturnType()));

const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT);
if (Proto) {
  if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, RParenLoc,
                              IsExecConfig))
    return ExprError();
} else {
  assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!")(static_cast <bool> (isa<FunctionNoProtoType>(FuncT
) && "Unknown FunctionType!") ? void (0) : __assert_fail
 ("isa<FunctionNoProtoType>(FuncT) && \"Unknown FunctionType!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5544, __extension__ __PRETTY_FUNCTION__));

  if (FDecl) {
    // Check if we have too few/too many template arguments, based
    // on our knowledge of the function definition.
    const FunctionDecl *Def = nullptr;
    if (FDecl->hasBody(Def) && Args.size() != Def->param_size()) {
      Proto = Def->getType()->getAs<FunctionProtoType>();
     if (!Proto || !(Proto->isVariadic() && Args.size() >= Def->param_size()))
        Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
        << (Args.size() > Def->param_size()) << FDecl << Fn->getSourceRange();
    }
    
    // If the function we're calling isn't a function prototype, but we have
    // a function prototype from a prior declaratiom, use that prototype.
    if (!FDecl->hasPrototype())
      Proto = FDecl->getType()->getAs<FunctionProtoType>();
  }

  // Promote the arguments (C99 6.5.2.2p6).
  for (unsigned i = 0, e = Args.size(); i != e; i++) {
    Expr *Arg = Args[i];

    if (Proto && i < Proto->getNumParams()) {
      InitializedEntity Entity = InitializedEntity::InitializeParameter(
          Context, Proto->getParamType(i), Proto->isParamConsumed(i));
      ExprResult ArgE =
          PerformCopyInitialization(Entity, SourceLocation(), Arg);
      if (ArgE.isInvalid())
        return true;
      
      Arg = ArgE.getAs<Expr>();

    } else {
      ExprResult ArgE = DefaultArgumentPromotion(Arg);

      if (ArgE.isInvalid())
        return true;

      Arg = ArgE.getAs<Expr>();
    }
    
    if (RequireCompleteType(Arg->getLocStart(),
                            Arg->getType(),
                            diag::err_call_incomplete_argument, Arg))
      return ExprError();

    TheCall->setArg(i, Arg);
  }
}

if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
  if (!Method->isStatic())
    return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
      << Fn->getSourceRange());

// Check for sentinels
if (NDecl)
  DiagnoseSentinelCalls(NDecl, LParenLoc, Args);

// Do special checking on direct calls to functions.
if (FDecl) {
  if (CheckFunctionCall(FDecl, TheCall, Proto))
    return ExprError();

  if (BuiltinID)
    return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
} else if (NDecl) {
  if (CheckPointerCall(NDecl, TheCall, Proto))
    return ExprError();
} else {
  if (CheckOtherCall(TheCall, Proto))
    return ExprError();
}

return MaybeBindToTemporary(TheCall);
5620}

5622ExprResult
5623Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
                         SourceLocation RParenLoc, Expr *InitExpr) {
assert(Ty && "ActOnCompoundLiteral(): missing type")(static_cast <bool> (Ty && "ActOnCompoundLiteral(): missing type"
) ? void (0) : __assert_fail ("Ty && \"ActOnCompoundLiteral(): missing type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5625, __extension__ __PRETTY_FUNCTION__));
assert(InitExpr && "ActOnCompoundLiteral(): missing expression")(static_cast <bool> (InitExpr && "ActOnCompoundLiteral(): missing expression"
) ? void (0) : __assert_fail ("InitExpr && \"ActOnCompoundLiteral(): missing expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5626, __extension__ __PRETTY_FUNCTION__));

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

return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
5634}

5636ExprResult
5637Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
                             SourceLocation RParenLoc, Expr *LiteralExpr) {
QualType literalType = TInfo->getType();

if (literalType->isArrayType()) {
  if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
        diag::err_illegal_decl_array_incomplete_type,
        SourceRange(LParenLoc,
                    LiteralExpr->getSourceRange().getEnd())))
    return ExprError();
  if (literalType->isVariableArrayType())
    return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
      << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
} else if (!literalType->isDependentType() &&
           RequireCompleteType(LParenLoc, literalType,
             diag::err_typecheck_decl_incomplete_type,
             SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
  return ExprError();

InitializedEntity Entity
  = InitializedEntity::InitializeCompoundLiteralInit(TInfo);
InitializationKind Kind
  = InitializationKind::CreateCStyleCast(LParenLoc, 
                                         SourceRange(LParenLoc, RParenLoc),
                                         /*InitList=*/true);
InitializationSequence InitSeq(*this, Entity, Kind, LiteralExpr);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind, LiteralExpr,
                                    &literalType);
if (Result.isInvalid())
  return ExprError();
LiteralExpr = Result.get();

bool isFileScope = !CurContext->isFunctionOrMethod();
if (isFileScope &&
    !LiteralExpr->isTypeDependent() &&
    !LiteralExpr->isValueDependent() &&
    !literalType->isDependentType()) { // 6.5.2.5p3
  if (CheckForConstantInitializer(LiteralExpr, literalType))
    return ExprError();
}

// In C, compound literals are l-values for some reason.
// For GCC compatibility, in C++, file-scope array compound literals with
// constant initializers are also l-values, and compound literals are
// otherwise prvalues.
//
// (GCC also treats C++ list-initialized file-scope array prvalues with
// constant initializers as l-values, but that's non-conforming, so we don't
// follow it there.)
//
// FIXME: It would be better to handle the lvalue cases as materializing and
// lifetime-extending a temporary object, but our materialized temporaries
// representation only supports lifetime extension from a variable, not "out
// of thin air".
// FIXME: For C++, we might want to instead lifetime-extend only if a pointer
// is bound to the result of applying array-to-pointer decay to the compound
// literal.
// FIXME: GCC supports compound literals of reference type, which should
// obviously have a value kind derived from the kind of reference involved.
ExprValueKind VK =
    (getLangOpts().CPlusPlus && !(isFileScope && literalType->isArrayType()))
        ? VK_RValue
        : VK_LValue;

return MaybeBindToTemporary(
    new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
                                      VK, LiteralExpr, isFileScope));
5704}

5706ExprResult
5707Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
                  SourceLocation RBraceLoc) {
// Immediately handle non-overload placeholders.  Overloads can be
// resolved contextually, but everything else here can't.
for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
  if (InitArgList[I]->getType()->isNonOverloadPlaceholderType()) {
    ExprResult result = CheckPlaceholderExpr(InitArgList[I]);

    // Ignore failures; dropping the entire initializer list because
    // of one failure would be terrible for indexing/etc.
    if (result.isInvalid()) continue;

    InitArgList[I] = result.get();
  }
}

// Semantic analysis for initializers is done by ActOnDeclarator() and
// CheckInitializer() - it requires knowledge of the object being initialized.

InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitArgList,
                                             RBraceLoc);
E->setType(Context.VoidTy); // FIXME: just a place holder for now.
return E;
5730}

5732/// Do an explicit extend of the given block pointer if we're in ARC.
5733void Sema::maybeExtendBlockObject(ExprResult &E) {
assert(E.get()->getType()->isBlockPointerType())(static_cast <bool> (E.get()->getType()->isBlockPointerType
()) ? void (0) : __assert_fail ("E.get()->getType()->isBlockPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5734, __extension__ __PRETTY_FUNCTION__));
assert(E.get()->isRValue())(static_cast <bool> (E.get()->isRValue()) ? void (0)
 : __assert_fail ("E.get()->isRValue()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5735, __extension__ __PRETTY_FUNCTION__));

// Only do this in an r-value context.
if (!getLangOpts().ObjCAutoRefCount) return;

E = ImplicitCastExpr::Create(Context, E.get()->getType(),
                             CK_ARCExtendBlockObject, E.get(),
                             /*base path*/ nullptr, VK_RValue);
Cleanup.setExprNeedsCleanups(true);
5744}

5746/// Prepare a conversion of the given expression to an ObjC object
5747/// pointer type.
5748CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
QualType type = E.get()->getType();
if (type->isObjCObjectPointerType()) {
  return CK_BitCast;
} else if (type->isBlockPointerType()) {
  maybeExtendBlockObject(E);
  return CK_BlockPointerToObjCPointerCast;
} else {
  assert(type->isPointerType())(static_cast <bool> (type->isPointerType()) ? void (
0) : __assert_fail ("type->isPointerType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5756, __extension__ __PRETTY_FUNCTION__));
  return CK_CPointerToObjCPointerCast;
}
5759}

5761/// Prepares for a scalar cast, performing all the necessary stages
5762/// except the final cast and returning the kind required.
5763CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
// Both Src and Dest are scalar types, i.e. arithmetic or pointer.
// Also, callers should have filtered out the invalid cases with
// pointers.  Everything else should be possible.

QualType SrcTy = Src.get()->getType();
if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
  return CK_NoOp;

switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
case Type::STK_MemberPointer:
  llvm_unreachable("member pointer type in C")::llvm::llvm_unreachable_internal("member pointer type in C",
 "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5774);

case Type::STK_CPointer:
case Type::STK_BlockPointer:
case Type::STK_ObjCObjectPointer:
  switch (DestTy->getScalarTypeKind()) {
  case Type::STK_CPointer: {
    LangAS SrcAS = SrcTy->getPointeeType().getAddressSpace();
    LangAS DestAS = DestTy->getPointeeType().getAddressSpace();
    if (SrcAS != DestAS)
      return CK_AddressSpaceConversion;
    return CK_BitCast;
  }
  case Type::STK_BlockPointer:
    return (SrcKind == Type::STK_BlockPointer
              ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
  case Type::STK_ObjCObjectPointer:
    if (SrcKind == Type::STK_ObjCObjectPointer)
      return CK_BitCast;
    if (SrcKind == Type::STK_CPointer)
      return CK_CPointerToObjCPointerCast;
    maybeExtendBlockObject(Src);
    return CK_BlockPointerToObjCPointerCast;
  case Type::STK_Bool:
    return CK_PointerToBoolean;
  case Type::STK_Integral:
    return CK_PointerToIntegral;
  case Type::STK_Floating:
  case Type::STK_FloatingComplex:
  case Type::STK_IntegralComplex:
  case Type::STK_MemberPointer:
    llvm_unreachable("illegal cast from pointer")::llvm::llvm_unreachable_internal("illegal cast from pointer"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5805);
  }
  llvm_unreachable("Should have returned before this")::llvm::llvm_unreachable_internal("Should have returned before this"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5807);

case Type::STK_Bool: // casting from bool is like casting from an integer
case Type::STK_Integral:
  switch (DestTy->getScalarTypeKind()) {
  case Type::STK_CPointer:
  case Type::STK_ObjCObjectPointer:
  case Type::STK_BlockPointer:
    if (Src.get()->isNullPointerConstant(Context,
                                         Expr::NPC_ValueDependentIsNull))
      return CK_NullToPointer;
    return CK_IntegralToPointer;
  case Type::STK_Bool:
    return CK_IntegralToBoolean;
  case Type::STK_Integral:
    return CK_IntegralCast;
  case Type::STK_Floating:
    return CK_IntegralToFloating;
  case Type::STK_IntegralComplex:
    Src = ImpCastExprToType(Src.get(),
                    DestTy->castAs<ComplexType>()->getElementType(),
                    CK_IntegralCast);
    return CK_IntegralRealToComplex;
  case Type::STK_FloatingComplex:
    Src = ImpCastExprToType(Src.get(),
                    DestTy->castAs<ComplexType>()->getElementType(),
                    CK_IntegralToFloating);
    return CK_FloatingRealToComplex;
  case Type::STK_MemberPointer:
    llvm_unreachable("member pointer type in C")::llvm::llvm_unreachable_internal("member pointer type in C",
 "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5836);
  }
  llvm_unreachable("Should have returned before this")::llvm::llvm_unreachable_internal("Should have returned before this"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5838);

case Type::STK_Floating:
  switch (DestTy->getScalarTypeKind()) {
  case Type::STK_Floating:
    return CK_FloatingCast;
  case Type::STK_Bool:
    return CK_FloatingToBoolean;
  case Type::STK_Integral:
    return CK_FloatingToIntegral;
  case Type::STK_FloatingComplex:
    Src = ImpCastExprToType(Src.get(),
                            DestTy->castAs<ComplexType>()->getElementType(),
                            CK_FloatingCast);
    return CK_FloatingRealToComplex;
  case Type::STK_IntegralComplex:
    Src = ImpCastExprToType(Src.get(),
                            DestTy->castAs<ComplexType>()->getElementType(),
                            CK_FloatingToIntegral);
    return CK_IntegralRealToComplex;
  case Type::STK_CPointer:
  case Type::STK_ObjCObjectPointer:
  case Type::STK_BlockPointer:
    llvm_unreachable("valid float->pointer cast?")::llvm::llvm_unreachable_internal("valid float->pointer cast?"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5861);
  case Type::STK_MemberPointer:
    llvm_unreachable("member pointer type in C")::llvm::llvm_unreachable_internal("member pointer type in C",
 "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5863);
  }
  llvm_unreachable("Should have returned before this")::llvm::llvm_unreachable_internal("Should have returned before this"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5865);

case Type::STK_FloatingComplex:
  switch (DestTy->getScalarTypeKind()) {
  case Type::STK_FloatingComplex:
    return CK_FloatingComplexCast;
  case Type::STK_IntegralComplex:
    return CK_FloatingComplexToIntegralComplex;
  case Type::STK_Floating: {
    QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
    if (Context.hasSameType(ET, DestTy))
      return CK_FloatingComplexToReal;
    Src = ImpCastExprToType(Src.get(), ET, CK_FloatingComplexToReal);
    return CK_FloatingCast;
  }
  case Type::STK_Bool:
    return CK_FloatingComplexToBoolean;
  case Type::STK_Integral:
    Src = ImpCastExprToType(Src.get(),
                            SrcTy->castAs<ComplexType>()->getElementType(),
                            CK_FloatingComplexToReal);
    return CK_FloatingToIntegral;
  case Type::STK_CPointer:
  case Type::STK_ObjCObjectPointer:
  case Type::STK_BlockPointer:
    llvm_unreachable("valid complex float->pointer cast?")::llvm::llvm_unreachable_internal("valid complex float->pointer cast?"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5890);
  case Type::STK_MemberPointer:
    llvm_unreachable("member pointer type in C")::llvm::llvm_unreachable_internal("member pointer type in C",
 "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5892);
  }
  llvm_unreachable("Should have returned before this")::llvm::llvm_unreachable_internal("Should have returned before this"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5894);

case Type::STK_IntegralComplex:
  switch (DestTy->getScalarTypeKind()) {
  case Type::STK_FloatingComplex:
    return CK_IntegralComplexToFloatingComplex;
  case Type::STK_IntegralComplex:
    return CK_IntegralComplexCast;
  case Type::STK_Integral: {
    QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
    if (Context.hasSameType(ET, DestTy))
      return CK_IntegralComplexToReal;
    Src = ImpCastExprToType(Src.get(), ET, CK_IntegralComplexToReal);
    return CK_IntegralCast;
  }
  case Type::STK_Bool:
    return CK_IntegralComplexToBoolean;
  case Type::STK_Floating:
    Src = ImpCastExprToType(Src.get(),
                            SrcTy->castAs<ComplexType>()->getElementType(),
                            CK_IntegralComplexToReal);
    return CK_IntegralToFloating;
  case Type::STK_CPointer:
  case Type::STK_ObjCObjectPointer:
  case Type::STK_BlockPointer:
    llvm_unreachable("valid complex int->pointer cast?")::llvm::llvm_unreachable_internal("valid complex int->pointer cast?"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5919);
  case Type::STK_MemberPointer:
    llvm_unreachable("member pointer type in C")::llvm::llvm_unreachable_internal("member pointer type in C",
 "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5921);
  }
  llvm_unreachable("Should have returned before this")::llvm::llvm_unreachable_internal("Should have returned before this"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5923);
}

llvm_unreachable("Unhandled scalar cast")::llvm::llvm_unreachable_internal("Unhandled scalar cast", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5926);
5927}

5929static bool breakDownVectorType(QualType type, uint64_t &len,
                              QualType &eltType) {
// Vectors are simple.
if (const VectorType *vecType = type->getAs<VectorType>()) {
  len = vecType->getNumElements();
  eltType = vecType->getElementType();
  assert(eltType->isScalarType())(static_cast <bool> (eltType->isScalarType()) ? void
 (0) : __assert_fail ("eltType->isScalarType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5935, __extension__ __PRETTY_FUNCTION__));
  return true;
}

// We allow lax conversion to and from non-vector types, but only if
// they're real types (i.e. non-complex, non-pointer scalar types).
if (!type->isRealType()) return false;

len = 1;
eltType = type;
return true;
5946}

5948/// Are the two types lax-compatible vector types?  That is, given
5949/// that one of them is a vector, do they have equal storage sizes,
5950/// where the storage size is the number of elements times the element
5951/// size?
5952///
5953/// This will also return false if either of the types is neither a
5954/// vector nor a real type.
5955bool Sema::areLaxCompatibleVectorTypes(QualType srcTy, QualType destTy) {
assert(destTy->isVectorType() || srcTy->isVectorType())(static_cast <bool> (destTy->isVectorType() || srcTy
->isVectorType()) ? void (0) : __assert_fail ("destTy->isVectorType() || srcTy->isVectorType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5956, __extension__ __PRETTY_FUNCTION__));

// Disallow lax conversions between scalars and ExtVectors (these
// conversions are allowed for other vector types because common headers
// depend on them).  Most scalar OP ExtVector cases are handled by the
// splat path anyway, which does what we want (convert, not bitcast).
// What this rules out for ExtVectors is crazy things like char4*float.
if (srcTy->isScalarType() && destTy->isExtVectorType()) return false;
if (destTy->isScalarType() && srcTy->isExtVectorType()) return false;

uint64_t srcLen, destLen;
QualType srcEltTy, destEltTy;
if (!breakDownVectorType(srcTy, srcLen, srcEltTy)) return false;
if (!breakDownVectorType(destTy, destLen, destEltTy)) return false;

// ASTContext::getTypeSize will return the size rounded up to a
// power of 2, so instead of using that, we need to use the raw
// element size multiplied by the element count.
uint64_t srcEltSize = Context.getTypeSize(srcEltTy);
uint64_t destEltSize = Context.getTypeSize(destEltTy);

return (srcLen * srcEltSize == destLen * destEltSize);
5978}

5980/// Is this a legal conversion between two types, one of which is
5981/// known to be a vector type?
5982bool Sema::isLaxVectorConversion(QualType srcTy, QualType destTy) {
assert(destTy->isVectorType() || srcTy->isVectorType())(static_cast <bool> (destTy->isVectorType() || srcTy
->isVectorType()) ? void (0) : __assert_fail ("destTy->isVectorType() || srcTy->isVectorType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5983, __extension__ __PRETTY_FUNCTION__));

if (!Context.getLangOpts().LaxVectorConversions)
  return false;
return areLaxCompatibleVectorTypes(srcTy, destTy);
5988}

5990bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
                         CastKind &Kind) {
assert(VectorTy->isVectorType() && "Not a vector type!")(static_cast <bool> (VectorTy->isVectorType() &&
 "Not a vector type!") ? void (0) : __assert_fail ("VectorTy->isVectorType() && \"Not a vector type!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 5992, __extension__ __PRETTY_FUNCTION__));

if (Ty->isVectorType() || Ty->isIntegralType(Context)) {
  if (!areLaxCompatibleVectorTypes(Ty, VectorTy))
    return Diag(R.getBegin(),
                Ty->isVectorType() ?
                diag::err_invalid_conversion_between_vectors :
                diag::err_invalid_conversion_between_vector_and_integer)
      << VectorTy << Ty << R;
} else
  return Diag(R.getBegin(),
              diag::err_invalid_conversion_between_vector_and_scalar)
    << VectorTy << Ty << R;

Kind = CK_BitCast;
return false;
6008}

6010ExprResult Sema::prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr) {
QualType DestElemTy = VectorTy->castAs<VectorType>()->getElementType();

if (DestElemTy == SplattedExpr->getType())
  return SplattedExpr;

assert(DestElemTy->isFloatingType() ||(static_cast <bool> (DestElemTy->isFloatingType() ||
 DestElemTy->isIntegralOrEnumerationType()) ? void (0) : __assert_fail
 ("DestElemTy->isFloatingType() || DestElemTy->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6017, __extension__ __PRETTY_FUNCTION__))
       DestElemTy->isIntegralOrEnumerationType())(static_cast <bool> (DestElemTy->isFloatingType() ||
 DestElemTy->isIntegralOrEnumerationType()) ? void (0) : __assert_fail
 ("DestElemTy->isFloatingType() || DestElemTy->isIntegralOrEnumerationType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6017, __extension__ __PRETTY_FUNCTION__));

CastKind CK;
if (VectorTy->isExtVectorType() && SplattedExpr->getType()->isBooleanType()) {
  // OpenCL requires that we convert `true` boolean expressions to -1, but
  // only when splatting vectors.
  if (DestElemTy->isFloatingType()) {
    // To avoid having to have a CK_BooleanToSignedFloating cast kind, we cast
    // in two steps: boolean to signed integral, then to floating.
    ExprResult CastExprRes = ImpCastExprToType(SplattedExpr, Context.IntTy,
                                               CK_BooleanToSignedIntegral);
    SplattedExpr = CastExprRes.get();
    CK = CK_IntegralToFloating;
  } else {
    CK = CK_BooleanToSignedIntegral;
  }
} else {
  ExprResult CastExprRes = SplattedExpr;
  CK = PrepareScalarCast(CastExprRes, DestElemTy);
  if (CastExprRes.isInvalid())
    return ExprError();
  SplattedExpr = CastExprRes.get();
}
return ImpCastExprToType(SplattedExpr, DestElemTy, CK);
6041}

6043ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
                                  Expr *CastExpr, CastKind &Kind) {
assert(DestTy->isExtVectorType() && "Not an extended vector type!")(static_cast <bool> (DestTy->isExtVectorType() &&
 "Not an extended vector type!") ? void (0) : __assert_fail (
"DestTy->isExtVectorType() && \"Not an extended vector type!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6045, __extension__ __PRETTY_FUNCTION__));

QualType SrcTy = CastExpr->getType();

// If SrcTy is a VectorType, the total size must match to explicitly cast to
// an ExtVectorType.
// In OpenCL, casts between vectors of different types are not allowed.
// (See OpenCL 6.2).
if (SrcTy->isVectorType()) {
  if (!areLaxCompatibleVectorTypes(SrcTy, DestTy) ||
      (getLangOpts().OpenCL &&
       !Context.hasSameUnqualifiedType(DestTy, SrcTy))) {
    Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
      << DestTy << SrcTy << R;
    return ExprError();
  }
  Kind = CK_BitCast;
  return CastExpr;
}

// All non-pointer scalars can be cast to ExtVector type.  The appropriate
// conversion will take place first from scalar to elt type, and then
// splat from elt type to vector.
if (SrcTy->isPointerType())
  return Diag(R.getBegin(),
              diag::err_invalid_conversion_between_vector_and_scalar)
    << DestTy << SrcTy << R;

Kind = CK_VectorSplat;
return prepareVectorSplat(DestTy, CastExpr);
6075}

6077ExprResult
6078Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
                  Declarator &D, ParsedType &Ty,
                  SourceLocation RParenLoc, Expr *CastExpr) {
assert(!D.isInvalidType() && (CastExpr != nullptr) &&(static_cast <bool> (!D.isInvalidType() && (CastExpr
 != nullptr) && "ActOnCastExpr(): missing type or expr"
) ? void (0) : __assert_fail ("!D.isInvalidType() && (CastExpr != nullptr) && \"ActOnCastExpr(): missing type or expr\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6082, __extension__ __PRETTY_FUNCTION__))
       "ActOnCastExpr(): missing type or expr")(static_cast <bool> (!D.isInvalidType() && (CastExpr
 != nullptr) && "ActOnCastExpr(): missing type or expr"
) ? void (0) : __assert_fail ("!D.isInvalidType() && (CastExpr != nullptr) && \"ActOnCastExpr(): missing type or expr\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6082, __extension__ __PRETTY_FUNCTION__));

TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
if (D.isInvalidType())
  return ExprError();

if (getLangOpts().CPlusPlus) {
  // Check that there are no default arguments (C++ only).
  CheckExtraCXXDefaultArguments(D);
} else {
  // Make sure any TypoExprs have been dealt with.
  ExprResult Res = CorrectDelayedTyposInExpr(CastExpr);
  if (!Res.isUsable())
    return ExprError();
  CastExpr = Res.get();
}

checkUnusedDeclAttributes(D);

QualType castType = castTInfo->getType();
Ty = CreateParsedType(castType, castTInfo);

bool isVectorLiteral = false;

// Check for an altivec or OpenCL literal,
// i.e. all the elements are integer constants.
ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
if ((getLangOpts().AltiVec || getLangOpts().ZVector || getLangOpts().OpenCL)
     && castType->isVectorType() && (PE || PLE)) {
  if (PLE && PLE->getNumExprs() == 0) {
    Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
    return ExprError();
  }
  if (PE || PLE->getNumExprs() == 1) {
    Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
    if (!E->getType()->isVectorType())
      isVectorLiteral = true;
  }
  else
    isVectorLiteral = true;
}

// If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
// then handle it as such.
if (isVectorLiteral)
  return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);

// If the Expr being casted is a ParenListExpr, handle it specially.
// This is not an AltiVec-style cast, so turn the ParenListExpr into a
// sequence of BinOp comma operators.
if (isa<ParenListExpr>(CastExpr)) {
  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
  if (Result.isInvalid()) return ExprError();
  CastExpr = Result.get();
}

if (getLangOpts().CPlusPlus && !castType->isVoidType() &&
    !getSourceManager().isInSystemMacro(LParenLoc))
  Diag(LParenLoc, diag::warn_old_style_cast) << CastExpr->getSourceRange();

CheckTollFreeBridgeCast(castType, CastExpr);

CheckObjCBridgeRelatedCast(castType, CastExpr);

DiscardMisalignedMemberAddress(castType.getTypePtr(), CastExpr);

return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
6150}

6152ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
                                  SourceLocation RParenLoc, Expr *E,
                                  TypeSourceInfo *TInfo) {
assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&(static_cast <bool> ((isa<ParenListExpr>(E) || isa
<ParenExpr>(E)) && "Expected paren or paren list expression"
) ? void (0) : __assert_fail ("(isa<ParenListExpr>(E) || isa<ParenExpr>(E)) && \"Expected paren or paren list expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6156, __extension__ __PRETTY_FUNCTION__))
       "Expected paren or paren list expression")(static_cast <bool> ((isa<ParenListExpr>(E) || isa
<ParenExpr>(E)) && "Expected paren or paren list expression"
) ? void (0) : __assert_fail ("(isa<ParenListExpr>(E) || isa<ParenExpr>(E)) && \"Expected paren or paren list expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6156, __extension__ __PRETTY_FUNCTION__));

Expr **exprs;
unsigned numExprs;
Expr *subExpr;
SourceLocation LiteralLParenLoc, LiteralRParenLoc;
if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
  LiteralLParenLoc = PE->getLParenLoc();
  LiteralRParenLoc = PE->getRParenLoc();
  exprs = PE->getExprs();
  numExprs = PE->getNumExprs();
} else { // isa<ParenExpr> by assertion at function entrance
  LiteralLParenLoc = cast<ParenExpr>(E)->getLParen();
  LiteralRParenLoc = cast<ParenExpr>(E)->getRParen();
  subExpr = cast<ParenExpr>(E)->getSubExpr();
  exprs = &subExpr;
  numExprs = 1;
}

QualType Ty = TInfo->getType();
assert(Ty->isVectorType() && "Expected vector type")(static_cast <bool> (Ty->isVectorType() && "Expected vector type"
) ? void (0) : __assert_fail ("Ty->isVectorType() && \"Expected vector type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6176, __extension__ __PRETTY_FUNCTION__));

SmallVector<Expr *, 8> initExprs;
const VectorType *VTy = Ty->getAs<VectorType>();
unsigned numElems = Ty->getAs<VectorType>()->getNumElements();

// '(...)' form of vector initialization in AltiVec: the number of
// initializers must be one or must match the size of the vector.
// If a single value is specified in the initializer then it will be
// replicated to all the components of the vector
if (VTy->getVectorKind() == VectorType::AltiVecVector) {
  // The number of initializers must be one or must match the size of the
  // vector. If a single value is specified in the initializer then it will
  // be replicated to all the components of the vector
  if (numExprs == 1) {
    QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
    ExprResult Literal = DefaultLvalueConversion(exprs[0]);
    if (Literal.isInvalid())
      return ExprError();
    Literal = ImpCastExprToType(Literal.get(), ElemTy,
                                PrepareScalarCast(Literal, ElemTy));
    return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
  }
  else if (numExprs < numElems) {
    Diag(E->getExprLoc(),
         diag::err_incorrect_number_of_vector_initializers);
    return ExprError();
  }
  else
    initExprs.append(exprs, exprs + numExprs);
}
else {
  // For OpenCL, when the number of initializers is a single value,
  // it will be replicated to all components of the vector.
  if (getLangOpts().OpenCL &&
      VTy->getVectorKind() == VectorType::GenericVector &&
      numExprs == 1) {
      QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
      ExprResult Literal = DefaultLvalueConversion(exprs[0]);
      if (Literal.isInvalid())
        return ExprError();
      Literal = ImpCastExprToType(Literal.get(), ElemTy,
                                  PrepareScalarCast(Literal, ElemTy));
      return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
  }
  
  initExprs.append(exprs, exprs + numExprs);
}
// FIXME: This means that pretty-printing the final AST will produce curly
// braces instead of the original commas.
InitListExpr *initE = new (Context) InitListExpr(Context, LiteralLParenLoc,
                                                 initExprs, LiteralRParenLoc);
initE->setType(Ty);
return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
6230}

6232/// This is not an AltiVec-style cast or or C++ direct-initialization, so turn
6233/// the ParenListExpr into a sequence of comma binary operators.
6234ExprResult
6235Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
if (!E)
  return OrigExpr;

ExprResult Result(E->getExpr(0));

for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
  Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
                      E->getExpr(i));

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

return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
6249}

6251ExprResult Sema::ActOnParenListExpr(SourceLocation L,
                                  SourceLocation R,
                                  MultiExprArg Val) {
Expr *expr = new (Context) ParenListExpr(Context, L, Val, R);
return expr;
6256}

6258/// \brief Emit a specialized diagnostic when one expression is a null pointer
6259/// constant and the other is not a pointer.  Returns true if a diagnostic is
6260/// emitted.
6261bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
                                    SourceLocation QuestionLoc) {
Expr *NullExpr = LHSExpr;
Expr *NonPointerExpr = RHSExpr;
Expr::NullPointerConstantKind NullKind =
    NullExpr->isNullPointerConstant(Context,
                                    Expr::NPC_ValueDependentIsNotNull);

if (NullKind == Expr::NPCK_NotNull) {
  NullExpr = RHSExpr;
  NonPointerExpr = LHSExpr;
  NullKind =
      NullExpr->isNullPointerConstant(Context,
                                      Expr::NPC_ValueDependentIsNotNull);
}

if (NullKind == Expr::NPCK_NotNull)
  return false;

if (NullKind == Expr::NPCK_ZeroExpression)
  return false;

if (NullKind == Expr::NPCK_ZeroLiteral) {
  // In this case, check to make sure that we got here from a "NULL"
  // string in the source code.
  NullExpr = NullExpr->IgnoreParenImpCasts();
  SourceLocation loc = NullExpr->getExprLoc();
  if (!findMacroSpelling(loc, "NULL"))
    return false;
}

int DiagType = (NullKind == Expr::NPCK_CXX11_nullptr);
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
    << NonPointerExpr->getType() << DiagType
    << NonPointerExpr->getSourceRange();
return true;
6297}

6299/// \brief Return false if the condition expression is valid, true otherwise.
6300static bool checkCondition(Sema &S, Expr *Cond, SourceLocation QuestionLoc) {
QualType CondTy = Cond->getType();

// OpenCL v1.1 s6.3.i says the condition cannot be a floating point type.
if (S.getLangOpts().OpenCL && CondTy->isFloatingType()) {
  S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
    << CondTy << Cond->getSourceRange();
  return true;
}

// C99 6.5.15p2
if (CondTy->isScalarType()) return false;

S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_scalar)
  << CondTy << Cond->getSourceRange();
return true;
6316}

6318/// \brief Handle when one or both operands are void type.
6319static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
                                       ExprResult &RHS) {
  Expr *LHSExpr = LHS.get();
  Expr *RHSExpr = RHS.get();

  if (!LHSExpr->getType()->isVoidType())
    S.Diag(RHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
      << RHSExpr->getSourceRange();
  if (!RHSExpr->getType()->isVoidType())
    S.Diag(LHSExpr->getLocStart(), diag::ext_typecheck_cond_one_void)
      << LHSExpr->getSourceRange();
  LHS = S.ImpCastExprToType(LHS.get(), S.Context.VoidTy, CK_ToVoid);
  RHS = S.ImpCastExprToType(RHS.get(), S.Context.VoidTy, CK_ToVoid);
  return S.Context.VoidTy;
6333}

6335/// \brief Return false if the NullExpr can be promoted to PointerTy,
6336/// true otherwise.
6337static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
                                      QualType PointerTy) {
if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
    !NullExpr.get()->isNullPointerConstant(S.Context,
                                          Expr::NPC_ValueDependentIsNull))
  return true;

NullExpr = S.ImpCastExprToType(NullExpr.get(), PointerTy, CK_NullToPointer);
return false;
6346}

6348/// \brief Checks compatibility between two pointers and return the resulting
6349/// type.
6350static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
                                                   ExprResult &RHS,
                                                   SourceLocation Loc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();

if (S.Context.hasSameType(LHSTy, RHSTy)) {
  // Two identical pointers types are always compatible.
  return LHSTy;
}

QualType lhptee, rhptee;

// Get the pointee types.
bool IsBlockPointer = false;
if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
  lhptee = LHSBTy->getPointeeType();
  rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
  IsBlockPointer = true;
} else {
  lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
  rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
}

// C99 6.5.15p6: If both operands are pointers to compatible types or to
// differently qualified versions of compatible types, the result type is
// a pointer to an appropriately qualified version of the composite
// type.

// Only CVR-qualifiers exist in the standard, and the differently-qualified
// clause doesn't make sense for our extensions. E.g. address space 2 should
// be incompatible with address space 3: they may live on different devices or
// anything.
Qualifiers lhQual = lhptee.getQualifiers();
Qualifiers rhQual = rhptee.getQualifiers();

LangAS ResultAddrSpace = LangAS::Default;
LangAS LAddrSpace = lhQual.getAddressSpace();
LangAS RAddrSpace = rhQual.getAddressSpace();
if (S.getLangOpts().OpenCL) {
  // OpenCL v1.1 s6.5 - Conversion between pointers to distinct address
  // spaces is disallowed.
  if (lhQual.isAddressSpaceSupersetOf(rhQual))
    ResultAddrSpace = LAddrSpace;
  else if (rhQual.isAddressSpaceSupersetOf(lhQual))
    ResultAddrSpace = RAddrSpace;
  else {
    S.Diag(Loc,
           diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
        << LHSTy << RHSTy << 2 << LHS.get()->getSourceRange()
        << RHS.get()->getSourceRange();
    return QualType();
  }
}

unsigned MergedCVRQual = lhQual.getCVRQualifiers() | rhQual.getCVRQualifiers();
auto LHSCastKind = CK_BitCast, RHSCastKind = CK_BitCast;
lhQual.removeCVRQualifiers();
rhQual.removeCVRQualifiers();

// OpenCL v2.0 specification doesn't extend compatibility of type qualifiers
// (C99 6.7.3) for address spaces. We assume that the check should behave in
// the same manner as it's defined for CVR qualifiers, so for OpenCL two
// qual types are compatible iff
//  * corresponded types are compatible
//  * CVR qualifiers are equal
//  * address spaces are equal
// Thus for conditional operator we merge CVR and address space unqualified
// pointees and if there is a composite type we return a pointer to it with
// merged qualifiers.
if (S.getLangOpts().OpenCL) {
  LHSCastKind = LAddrSpace == ResultAddrSpace
                    ? CK_BitCast
                    : CK_AddressSpaceConversion;
  RHSCastKind = RAddrSpace == ResultAddrSpace
                    ? CK_BitCast
                    : CK_AddressSpaceConversion;
  lhQual.removeAddressSpace();
  rhQual.removeAddressSpace();
}

lhptee = S.Context.getQualifiedType(lhptee.getUnqualifiedType(), lhQual);
rhptee = S.Context.getQualifiedType(rhptee.getUnqualifiedType(), rhQual);

QualType CompositeTy = S.Context.mergeTypes(lhptee, rhptee);

if (CompositeTy.isNull()) {
  // In this situation, we assume void* type. No especially good
  // reason, but this is what gcc does, and we do have to pick
  // to get a consistent AST.
  QualType incompatTy;
  incompatTy = S.Context.getPointerType(
      S.Context.getAddrSpaceQualType(S.Context.VoidTy, ResultAddrSpace));
  LHS = S.ImpCastExprToType(LHS.get(), incompatTy, LHSCastKind);
  RHS = S.ImpCastExprToType(RHS.get(), incompatTy, RHSCastKind);
  // FIXME: For OpenCL the warning emission and cast to void* leaves a room
  // for casts between types with incompatible address space qualifiers.
  // For the following code the compiler produces casts between global and
  // local address spaces of the corresponded innermost pointees:
  // local int *global *a;
  // global int *global *b;
  // a = (0 ? a : b); // see C99 6.5.16.1.p1.
  S.Diag(Loc, diag::ext_typecheck_cond_incompatible_pointers)
      << LHSTy << RHSTy << LHS.get()->getSourceRange()
      << RHS.get()->getSourceRange();
  return incompatTy;
}

// The pointer types are compatible.
// In case of OpenCL ResultTy should have the address space qualifier
// which is a superset of address spaces of both the 2nd and the 3rd
// operands of the conditional operator.
QualType ResultTy = [&, ResultAddrSpace]() {
  if (S.getLangOpts().OpenCL) {
    Qualifiers CompositeQuals = CompositeTy.getQualifiers();
    CompositeQuals.setAddressSpace(ResultAddrSpace);
    return S.Context
        .getQualifiedType(CompositeTy.getUnqualifiedType(), CompositeQuals)
        .withCVRQualifiers(MergedCVRQual);
  }
  return CompositeTy.withCVRQualifiers(MergedCVRQual);
}();
if (IsBlockPointer)
  ResultTy = S.Context.getBlockPointerType(ResultTy);
else
  ResultTy = S.Context.getPointerType(ResultTy);

LHS = S.ImpCastExprToType(LHS.get(), ResultTy, LHSCastKind);
RHS = S.ImpCastExprToType(RHS.get(), ResultTy, RHSCastKind);
return ResultTy;
6480}

6482/// \brief Return the resulting type when the operands are both block pointers.
6483static QualType checkConditionalBlockPointerCompatibility(Sema &S,
                                                        ExprResult &LHS,
                                                        ExprResult &RHS,
                                                        SourceLocation Loc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();

if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
  if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
    QualType destType = S.Context.getPointerType(S.Context.VoidTy);
    LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
    RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
    return destType;
  }
  S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
    << LHSTy << RHSTy << LHS.get()->getSourceRange()
    << RHS.get()->getSourceRange();
  return QualType();
}

// We have 2 block pointer types.
return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
6505}

6507/// \brief Return the resulting type when the operands are both pointers.
6508static QualType
6509checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
                                          ExprResult &RHS,
                                          SourceLocation Loc) {
// get the pointer types
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();

// get the "pointed to" types
QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();

// ignore qualifiers on void (C99 6.5.15p3, clause 6)
if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
  // Figure out necessary qualifiers (C99 6.5.15p6)
  QualType destPointee
    = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
  QualType destType = S.Context.getPointerType(destPointee);
  // Add qualifiers if necessary.
  LHS = S.ImpCastExprToType(LHS.get(), destType, CK_NoOp);
  // Promote to void*.
  RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
  return destType;
}
if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
  QualType destPointee
    = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
  QualType destType = S.Context.getPointerType(destPointee);
  // Add qualifiers if necessary.
  RHS = S.ImpCastExprToType(RHS.get(), destType, CK_NoOp);
  // Promote to void*.
  LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
  return destType;
}

return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
6544}

6546/// \brief Return false if the first expression is not an integer and the second
6547/// expression is not a pointer, true otherwise.
6548static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
                                      Expr* PointerExpr, SourceLocation Loc,
                                      bool IsIntFirstExpr) {
if (!PointerExpr->getType()->isPointerType() ||
    !Int.get()->getType()->isIntegerType())
  return false;

Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();

S.Diag(Loc, diag::ext_typecheck_cond_pointer_integer_mismatch)
  << Expr1->getType() << Expr2->getType()
  << Expr1->getSourceRange() << Expr2->getSourceRange();
Int = S.ImpCastExprToType(Int.get(), PointerExpr->getType(),
                          CK_IntegralToPointer);
return true;
6564}

6566/// \brief Simple conversion between integer and floating point types.
6567///
6568/// Used when handling the OpenCL conditional operator where the
6569/// condition is a vector while the other operands are scalar.
6570///
6571/// OpenCL v1.1 s6.3.i and s6.11.6 together require that the scalar
6572/// types are either integer or floating type. Between the two
6573/// operands, the type with the higher rank is defined as the "result
6574/// type". The other operand needs to be promoted to the same type. No
6575/// other type promotion is allowed. We cannot use
6576/// UsualArithmeticConversions() for this purpose, since it always
6577/// promotes promotable types.
6578static QualType OpenCLArithmeticConversions(Sema &S, ExprResult &LHS,
                                          ExprResult &RHS,
                                          SourceLocation QuestionLoc) {
LHS = S.DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
  return QualType();
RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
  return QualType();

// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType =
  S.Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
QualType RHSType =
  S.Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();

if (!LHSType->isIntegerType() && !LHSType->isRealFloatingType()) {
  S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
    << LHSType << LHS.get()->getSourceRange();
  return QualType();
}

if (!RHSType->isIntegerType() && !RHSType->isRealFloatingType()) {
  S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
    << RHSType << RHS.get()->getSourceRange();
  return QualType();
}

// If both types are identical, no conversion is needed.
if (LHSType == RHSType)
  return LHSType;

// Now handle "real" floating types (i.e. float, double, long double).
if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
  return handleFloatConversion(S, LHS, RHS, LHSType, RHSType,
                               /*IsCompAssign = */ false);

// Finally, we have two differing integer types.
return handleIntegerConversion<doIntegralCast, doIntegralCast>
(S, LHS, RHS, LHSType, RHSType, /*IsCompAssign = */ false);
6619}

6621/// \brief Convert scalar operands to a vector that matches the
6622///        condition in length.
6623///
6624/// Used when handling the OpenCL conditional operator where the
6625/// condition is a vector while the other operands are scalar.
6626///
6627/// We first compute the "result type" for the scalar operands
6628/// according to OpenCL v1.1 s6.3.i. Both operands are then converted
6629/// into a vector of that type where the length matches the condition
6630/// vector type. s6.11.6 requires that the element types of the result
6631/// and the condition must have the same number of bits.
6632static QualType
6633OpenCLConvertScalarsToVectors(Sema &S, ExprResult &LHS, ExprResult &RHS,
                            QualType CondTy, SourceLocation QuestionLoc) {
QualType ResTy = OpenCLArithmeticConversions(S, LHS, RHS, QuestionLoc);
if (ResTy.isNull()) return QualType();

const VectorType *CV = CondTy->getAs<VectorType>();
assert(CV)(static_cast <bool> (CV) ? void (0) : __assert_fail ("CV"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6639, __extension__ __PRETTY_FUNCTION__));

// Determine the vector result type
unsigned NumElements = CV->getNumElements();
QualType VectorTy = S.Context.getExtVectorType(ResTy, NumElements);

// Ensure that all types have the same number of bits
if (S.Context.getTypeSize(CV->getElementType())
    != S.Context.getTypeSize(ResTy)) {
  // Since VectorTy is created internally, it does not pretty print
  // with an OpenCL name. Instead, we just print a description.
  std::string EleTyName = ResTy.getUnqualifiedType().getAsString();
  SmallString<64> Str;
  llvm::raw_svector_ostream OS(Str);
  OS << "(vector of " << NumElements << " '" << EleTyName << "' values)";
  S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
    << CondTy << OS.str();
  return QualType();
}

// Convert operands to the vector result type
LHS = S.ImpCastExprToType(LHS.get(), VectorTy, CK_VectorSplat);
RHS = S.ImpCastExprToType(RHS.get(), VectorTy, CK_VectorSplat);

return VectorTy;
6664}

6666/// \brief Return false if this is a valid OpenCL condition vector
6667static bool checkOpenCLConditionVector(Sema &S, Expr *Cond,
                                     SourceLocation QuestionLoc) {
// OpenCL v1.1 s6.11.6 says the elements of the vector must be of
// integral type.
const VectorType *CondTy = Cond->getType()->getAs<VectorType>();
assert(CondTy)(static_cast <bool> (CondTy) ? void (0) : __assert_fail
 ("CondTy", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6672, __extension__ __PRETTY_FUNCTION__));
QualType EleTy = CondTy->getElementType();
if (EleTy->isIntegerType()) return false;

S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
  << Cond->getType() << Cond->getSourceRange();
return true;
6679}

6681/// \brief Return false if the vector condition type and the vector
6682///        result type are compatible.
6683///
6684/// OpenCL v1.1 s6.11.6 requires that both vector types have the same
6685/// number of elements, and their element types have the same number
6686/// of bits.
6687static bool checkVectorResult(Sema &S, QualType CondTy, QualType VecResTy,
                            SourceLocation QuestionLoc) {
const VectorType *CV = CondTy->getAs<VectorType>();
const VectorType *RV = VecResTy->getAs<VectorType>();
assert(CV && RV)(static_cast <bool> (CV && RV) ? void (0) : __assert_fail
 ("CV && RV", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 6691, __extension__ __PRETTY_FUNCTION__));

if (CV->getNumElements() != RV->getNumElements()) {
  S.Diag(QuestionLoc, diag::err_conditional_vector_size)
    << CondTy << VecResTy;
  return true;
}

QualType CVE = CV->getElementType();
QualType RVE = RV->getElementType();

if (S.Context.getTypeSize(CVE) != S.Context.getTypeSize(RVE)) {
  S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
    << CondTy << VecResTy;
  return true;
}

return false;
6709}

6711/// \brief Return the resulting type for the conditional operator in
6712///        OpenCL (aka "ternary selection operator", OpenCL v1.1
6713///        s6.3.i) when the condition is a vector type.
6714static QualType
6715OpenCLCheckVectorConditional(Sema &S, ExprResult &Cond,
                           ExprResult &LHS, ExprResult &RHS,
                           SourceLocation QuestionLoc) {
Cond = S.DefaultFunctionArrayLvalueConversion(Cond.get()); 
if (Cond.isInvalid())
  return QualType();
QualType CondTy = Cond.get()->getType();

if (checkOpenCLConditionVector(S, Cond.get(), QuestionLoc))
  return QualType();

// If either operand is a vector then find the vector type of the
// result as specified in OpenCL v1.1 s6.3.i.
if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  QualType VecResTy = S.CheckVectorOperands(LHS, RHS, QuestionLoc,
                                            /*isCompAssign*/false,
                                            /*AllowBothBool*/true,
                                            /*AllowBoolConversions*/false);
  if (VecResTy.isNull()) return QualType();
  // The result type must match the condition type as specified in
  // OpenCL v1.1 s6.11.6.
  if (checkVectorResult(S, CondTy, VecResTy, QuestionLoc))
    return QualType();
  return VecResTy;
}

// Both operands are scalar.
return OpenCLConvertScalarsToVectors(S, LHS, RHS, CondTy, QuestionLoc);
6744}

6746/// \brief Return true if the Expr is block type
6747static bool checkBlockType(Sema &S, const Expr *E) {
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
  QualType Ty = CE->getCallee()->getType();
  if (Ty->isBlockPointerType()) {
    S.Diag(E->getExprLoc(), diag::err_opencl_ternary_with_block);
    return true;
  }
}
return false;
6756}

6758/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
6759/// In that case, LHS = cond.
6760/// C99 6.5.15
6761QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
                                      ExprResult &RHS, ExprValueKind &VK,
                                      ExprObjectKind &OK,
                                      SourceLocation QuestionLoc) {

ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
if (!LHSResult.isUsable()) return QualType();
LHS = LHSResult;

ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
if (!RHSResult.isUsable()) return QualType();
RHS = RHSResult;

// C++ is sufficiently different to merit its own checker.
if (getLangOpts().CPlusPlus)
  return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);

VK = VK_RValue;
OK = OK_Ordinary;

// The OpenCL operator with a vector condition is sufficiently
// different to merit its own checker.
if (getLangOpts().OpenCL && Cond.get()->getType()->isVectorType())
  return OpenCLCheckVectorConditional(*this, Cond, LHS, RHS, QuestionLoc);

// First, check the condition.
Cond = UsualUnaryConversions(Cond.get());
if (Cond.isInvalid())
  return QualType();
if (checkCondition(*this, Cond.get(), QuestionLoc))
  return QualType();

// Now check the two expressions.
if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType())
  return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false,
                             /*AllowBothBool*/true,
                             /*AllowBoolConversions*/false);

QualType ResTy = UsualArithmeticConversions(LHS, RHS);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();

QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();

// Diagnose attempts to convert between __float128 and long double where
// such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSTy, RHSTy)) {
  Diag(QuestionLoc,
       diag::err_typecheck_cond_incompatible_operands) << LHSTy << RHSTy
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
  return QualType();
}

// OpenCL v2.0 s6.12.5 - Blocks cannot be used as expressions of the ternary
// selection operator (?:).
if (getLangOpts().OpenCL &&
    (checkBlockType(*this, LHS.get()) | checkBlockType(*this, RHS.get()))) {
  return QualType();
}

// If both operands have arithmetic type, do the usual arithmetic conversions
// to find a common type: C99 6.5.15p3,5.
if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
  LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
  RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));

  return ResTy;
}

// If both operands are the same structure or union type, the result is that
// type.
if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) {    // C99 6.5.15p3
  if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
    if (LHSRT->getDecl() == RHSRT->getDecl())
      // "If both the operands have structure or union type, the result has
      // that type."  This implies that CV qualifiers are dropped.
      return LHSTy.getUnqualifiedType();
  // FIXME: Type of conditional expression must be complete in C mode.
}

// C99 6.5.15p5: "If both operands have void type, the result has void type."
// The following || allows only one side to be void (a GCC-ism).
if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
  return checkConditionalVoidType(*this, LHS, RHS);
}

// C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
// the type of the other operand."
if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;

// All objective-c pointer type analysis is done here.
QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
                                                      QuestionLoc);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();
if (!compositeType.isNull())
  return compositeType;


// Handle block pointer types.
if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
  return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
                                                   QuestionLoc);

// Check constraints for C object pointers types (C99 6.5.15p3,6).
if (LHSTy->isPointerType() && RHSTy->isPointerType())
  return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
                                                     QuestionLoc);

// GCC compatibility: soften pointer/integer mismatch.  Note that
// null pointers have been filtered out by this point.
if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
    /*isIntFirstExpr=*/true))
  return RHSTy;
if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
    /*isIntFirstExpr=*/false))
  return LHSTy;

// Emit a better diagnostic if one of the expressions is a null pointer
// constant and the other is not a pointer type. In this case, the user most
// likely forgot to take the address of the other expression.
if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
  return QualType();

// Otherwise, the operands are not compatible.
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
  << LHSTy << RHSTy << LHS.get()->getSourceRange()
  << RHS.get()->getSourceRange();
return QualType();
6893}

6895/// FindCompositeObjCPointerType - Helper method to find composite type of
6896/// two objective-c pointer types of the two input expressions.
6897QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
                                          SourceLocation QuestionLoc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();

// Handle things like Class and struct objc_class*.  Here we case the result
// to the pseudo-builtin, because that will be implicitly cast back to the
// redefinition type if an attempt is made to access its fields.
if (LHSTy->isObjCClassType() &&
    (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
  RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
  return LHSTy;
}
if (RHSTy->isObjCClassType() &&
    (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
  LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
  return RHSTy;
}
// And the same for struct objc_object* / id
if (LHSTy->isObjCIdType() &&
    (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
  RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
  return LHSTy;
}
if (RHSTy->isObjCIdType() &&
    (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
  LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
  return RHSTy;
}
// And the same for struct objc_selector* / SEL
if (Context.isObjCSelType(LHSTy) &&
    (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
  RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_BitCast);
  return LHSTy;
}
if (Context.isObjCSelType(RHSTy) &&
    (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
  LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_BitCast);
  return RHSTy;
}
// Check constraints for Objective-C object pointers types.
if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {

  if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
    // Two identical object pointer types are always compatible.
    return LHSTy;
  }
  const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
  const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
  QualType compositeType = LHSTy;

  // If both operands are interfaces and either operand can be
  // assigned to the other, use that type as the composite
  // type. This allows
  //   xxx ? (A*) a : (B*) b
  // where B is a subclass of A.
  //
  // Additionally, as for assignment, if either type is 'id'
  // allow silent coercion. Finally, if the types are
  // incompatible then make sure to use 'id' as the composite
  // type so the result is acceptable for sending messages to.

  // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
  // It could return the composite type.
  if (!(compositeType =
        Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull()) {
    // Nothing more to do.
  } else if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
    compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
  } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
    compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
  } else if ((LHSTy->isObjCQualifiedIdType() ||
              RHSTy->isObjCQualifiedIdType()) &&
             Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
    // Need to handle "id<xx>" explicitly.
    // GCC allows qualified id and any Objective-C type to devolve to
    // id. Currently localizing to here until clear this should be
    // part of ObjCQualifiedIdTypesAreCompatible.
    compositeType = Context.getObjCIdType();
  } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
    compositeType = Context.getObjCIdType();
  } else {
    Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
    << LHSTy << RHSTy
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    QualType incompatTy = Context.getObjCIdType();
    LHS = ImpCastExprToType(LHS.get(), incompatTy, CK_BitCast);
    RHS = ImpCastExprToType(RHS.get(), incompatTy, CK_BitCast);
    return incompatTy;
  }
  // The object pointer types are compatible.
  LHS = ImpCastExprToType(LHS.get(), compositeType, CK_BitCast);
  RHS = ImpCastExprToType(RHS.get(), compositeType, CK_BitCast);
  return compositeType;
}
// Check Objective-C object pointer types and 'void *'
if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
  if (getLangOpts().ObjCAutoRefCount) {
    // ARC forbids the implicit conversion of object pointers to 'void *',
    // so these types are not compatible.
    Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
        << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    LHS = RHS = true;
    return QualType();
  }
  QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
  QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
  QualType destPointee
  = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
  QualType destType = Context.getPointerType(destPointee);
  // Add qualifiers if necessary.
  LHS = ImpCastExprToType(LHS.get(), destType, CK_NoOp);
  // Promote to void*.
  RHS = ImpCastExprToType(RHS.get(), destType, CK_BitCast);
  return destType;
}
if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
  if (getLangOpts().ObjCAutoRefCount) {
    // ARC forbids the implicit conversion of object pointers to 'void *',
    // so these types are not compatible.
    Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
        << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    LHS = RHS = true;
    return QualType();
  }
  QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
  QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
  QualType destPointee
  = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
  QualType destType = Context.getPointerType(destPointee);
  // Add qualifiers if necessary.
  RHS = ImpCastExprToType(RHS.get(), destType, CK_NoOp);
  // Promote to void*.
  LHS = ImpCastExprToType(LHS.get(), destType, CK_BitCast);
  return destType;
}
return QualType();
7034}

7036/// SuggestParentheses - Emit a note with a fixit hint that wraps
7037/// ParenRange in parentheses.
7038static void SuggestParentheses(Sema &Self, SourceLocation Loc,
                             const PartialDiagnostic &Note,
                             SourceRange ParenRange) {
SourceLocation EndLoc = Self.getLocForEndOfToken(ParenRange.getEnd());
if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
    EndLoc.isValid()) {
  Self.Diag(Loc, Note)
    << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
    << FixItHint::CreateInsertion(EndLoc, ")");
} else {
  // We can't display the parentheses, so just show the bare note.
  Self.Diag(Loc, Note) << ParenRange;
}
7051}

7053static bool IsArithmeticOp(BinaryOperatorKind Opc) {
return BinaryOperator::isAdditiveOp(Opc) ||
       BinaryOperator::isMultiplicativeOp(Opc) ||
       BinaryOperator::isShiftOp(Opc);
7057}

7059/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
7060/// expression, either using a built-in or overloaded operator,
7061/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
7062/// expression.
7063static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
                                 Expr **RHSExprs) {
// Don't strip parenthesis: we should not warn if E is in parenthesis.
E = E->IgnoreImpCasts();
E = E->IgnoreConversionOperator();
E = E->IgnoreImpCasts();

// Built-in binary operator.
if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
  if (IsArithmeticOp(OP->getOpcode())) {
    *Opcode = OP->getOpcode();
    *RHSExprs = OP->getRHS();
    return true;
  }
}

// Overloaded operator.
if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
  if (Call->getNumArgs() != 2)
    return false;

  // Make sure this is really a binary operator that is safe to pass into
  // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
  OverloadedOperatorKind OO = Call->getOperator();
  if (OO < OO_Plus || OO > OO_Arrow ||
      OO == OO_PlusPlus || OO == OO_MinusMinus)
    return false;

  BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
  if (IsArithmeticOp(OpKind)) {
    *Opcode = OpKind;
    *RHSExprs = Call->getArg(1);
    return true;
  }
}

return false;
7100}

7102/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
7103/// or is a logical expression such as (x==y) which has int type, but is
7104/// commonly interpreted as boolean.
7105static bool ExprLooksBoolean(Expr *E) {
E = E->IgnoreParenImpCasts();

if (E->getType()->isBooleanType())
  return true;
if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
  return OP->isComparisonOp() || OP->isLogicalOp();
if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
  return OP->getOpcode() == UO_LNot;
if (E->getType()->isPointerType())
  return true;

return false;
7118}

7120/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
7121/// and binary operator are mixed in a way that suggests the programmer assumed
7122/// the conditional operator has higher precedence, for example:
7123/// "int x = a + someBinaryCondition ? 1 : 2".
7124static void DiagnoseConditionalPrecedence(Sema &Self,
                                        SourceLocation OpLoc,
                                        Expr *Condition,
                                        Expr *LHSExpr,
                                        Expr *RHSExpr) {
BinaryOperatorKind CondOpcode;
Expr *CondRHS;

if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
  return;
if (!ExprLooksBoolean(CondRHS))
  return;

// The condition is an arithmetic binary expression, with a right-
// hand side that looks boolean, so warn.

Self.Diag(OpLoc, diag::warn_precedence_conditional)
    << Condition->getSourceRange()
    << BinaryOperator::getOpcodeStr(CondOpcode);

SuggestParentheses(Self, OpLoc,
  Self.PDiag(diag::note_precedence_silence)
    << BinaryOperator::getOpcodeStr(CondOpcode),
  SourceRange(Condition->getLocStart(), Condition->getLocEnd()));

SuggestParentheses(Self, OpLoc,
  Self.PDiag(diag::note_precedence_conditional_first),
  SourceRange(CondRHS->getLocStart(), RHSExpr->getLocEnd()));
7152}

7154/// Compute the nullability of a conditional expression.
7155static QualType computeConditionalNullability(QualType ResTy, bool IsBin,
                                            QualType LHSTy, QualType RHSTy,
                                            ASTContext &Ctx) {
if (!ResTy->isAnyPointerType())
  return ResTy;

auto GetNullability = [&Ctx](QualType Ty) {
  Optional<NullabilityKind> Kind = Ty->getNullability(Ctx);
  if (Kind)
    return *Kind;
  return NullabilityKind::Unspecified;
};

auto LHSKind = GetNullability(LHSTy), RHSKind = GetNullability(RHSTy);
NullabilityKind MergedKind;

// Compute nullability of a binary conditional expression.
if (IsBin) {
  if (LHSKind == NullabilityKind::NonNull)
    MergedKind = NullabilityKind::NonNull;
  else
    MergedKind = RHSKind;
// Compute nullability of a normal conditional expression.
} else {
  if (LHSKind == NullabilityKind::Nullable ||
      RHSKind == NullabilityKind::Nullable)
    MergedKind = NullabilityKind::Nullable;
  else if (LHSKind == NullabilityKind::NonNull)
    MergedKind = RHSKind;
  else if (RHSKind == NullabilityKind::NonNull)
    MergedKind = LHSKind;
  else
    MergedKind = NullabilityKind::Unspecified;
}

// Return if ResTy already has the correct nullability.
if (GetNullability(ResTy) == MergedKind)
  return ResTy;

// Strip all nullability from ResTy.
while (ResTy->getNullability(Ctx))
  ResTy = ResTy.getSingleStepDesugaredType(Ctx);

// Create a new AttributedType with the new nullability kind.
auto NewAttr = AttributedType::getNullabilityAttrKind(MergedKind);
return Ctx.getAttributedType(NewAttr, ResTy, ResTy);
7201}

7203/// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
7204/// in the case of a the GNU conditional expr extension.
7205ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
                                  SourceLocation ColonLoc,
                                  Expr *CondExpr, Expr *LHSExpr,
                                  Expr *RHSExpr) {
if (!getLangOpts().CPlusPlus) {
  // C cannot handle TypoExpr nodes in the condition because it
  // doesn't handle dependent types properly, so make sure any TypoExprs have
  // been dealt with before checking the operands.
  ExprResult CondResult = CorrectDelayedTyposInExpr(CondExpr);
  ExprResult LHSResult = CorrectDelayedTyposInExpr(LHSExpr);
  ExprResult RHSResult = CorrectDelayedTyposInExpr(RHSExpr);

  if (!CondResult.isUsable())
    return ExprError();

  if (LHSExpr) {
    if (!LHSResult.isUsable())
      return ExprError();
  }

  if (!RHSResult.isUsable())
    return ExprError();

  CondExpr = CondResult.get();
  LHSExpr = LHSResult.get();
  RHSExpr = RHSResult.get();
}

// If this is the gnu "x ?: y" extension, analyze the types as though the LHS
// was the condition.
OpaqueValueExpr *opaqueValue = nullptr;
Expr *commonExpr = nullptr;
if (!LHSExpr) {
  commonExpr = CondExpr;
  // Lower out placeholder types first.  This is important so that we don't
  // try to capture a placeholder. This happens in few cases in C++; such
  // as Objective-C++'s dictionary subscripting syntax.
  if (commonExpr->hasPlaceholderType()) {
    ExprResult result = CheckPlaceholderExpr(commonExpr);
    if (!result.isUsable()) return ExprError();
    commonExpr = result.get();
  }
  // We usually want to apply unary conversions *before* saving, except
  // in the special case of a C++ l-value conditional.
  if (!(getLangOpts().CPlusPlus
        && !commonExpr->isTypeDependent()
        && commonExpr->getValueKind() == RHSExpr->getValueKind()
        && commonExpr->isGLValue()
        && commonExpr->isOrdinaryOrBitFieldObject()
        && RHSExpr->isOrdinaryOrBitFieldObject()
        && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
    ExprResult commonRes = UsualUnaryConversions(commonExpr);
    if (commonRes.isInvalid())
      return ExprError();
    commonExpr = commonRes.get();
  }

  // If the common expression is a class or array prvalue, materialize it
  // so that we can safely refer to it multiple times.
  if (commonExpr->isRValue() && (commonExpr->getType()->isRecordType() ||
                                 commonExpr->getType()->isArrayType())) {
    ExprResult MatExpr = TemporaryMaterializationConversion(commonExpr);
    if (MatExpr.isInvalid())
      return ExprError();
    commonExpr = MatExpr.get();
  }

  opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
                                              commonExpr->getType(),
                                              commonExpr->getValueKind(),
                                              commonExpr->getObjectKind(),
                                              commonExpr);
  LHSExpr = CondExpr = opaqueValue;
}

QualType LHSTy = LHSExpr->getType(), RHSTy = RHSExpr->getType();
ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
ExprResult Cond = CondExpr, LHS = LHSExpr, RHS = RHSExpr;
QualType result = CheckConditionalOperands(Cond, LHS, RHS, 
                                           VK, OK, QuestionLoc);
if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
    RHS.isInvalid())
  return ExprError();

DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
                              RHS.get());

CheckBoolLikeConversion(Cond.get(), QuestionLoc);

result = computeConditionalNullability(result, commonExpr, LHSTy, RHSTy,
                                       Context);

if (!commonExpr)
  return new (Context)
      ConditionalOperator(Cond.get(), QuestionLoc, LHS.get(), ColonLoc,
                          RHS.get(), result, VK, OK);

return new (Context) BinaryConditionalOperator(
    commonExpr, opaqueValue, Cond.get(), LHS.get(), RHS.get(), QuestionLoc,
    ColonLoc, result, VK, OK);
7306}

7308// checkPointerTypesForAssignment - This is a very tricky routine (despite
7309// being closely modeled after the C99 spec:-). The odd characteristic of this
7310// routine is it effectively iqnores the qualifiers on the top level pointee.
7311// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
7312// FIXME: add a couple examples in this comment.
7313static Sema::AssignConvertType
7314checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
assert(LHSType.isCanonical() && "LHS not canonicalized!")(static_cast <bool> (LHSType.isCanonical() && "LHS not canonicalized!"
) ? void (0) : __assert_fail ("LHSType.isCanonical() && \"LHS not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7315, __extension__ __PRETTY_FUNCTION__));
assert(RHSType.isCanonical() && "RHS not canonicalized!")(static_cast <bool> (RHSType.isCanonical() && "RHS not canonicalized!"
) ? void (0) : __assert_fail ("RHSType.isCanonical() && \"RHS not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7316, __extension__ __PRETTY_FUNCTION__));

// get the "pointed to" type (ignoring qualifiers at the top level)
const Type *lhptee, *rhptee;
Qualifiers lhq, rhq;
std::tie(lhptee, lhq) =
    cast<PointerType>(LHSType)->getPointeeType().split().asPair();
std::tie(rhptee, rhq) =
    cast<PointerType>(RHSType)->getPointeeType().split().asPair();

Sema::AssignConvertType ConvTy = Sema::Compatible;

// C99 6.5.16.1p1: This following citation is common to constraints
// 3 & 4 (below). ...and the type *pointed to* by the left has all the
// qualifiers of the type *pointed to* by the right;

// As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
    lhq.compatiblyIncludesObjCLifetime(rhq)) {
  // Ignore lifetime for further calculation.
  lhq.removeObjCLifetime();
  rhq.removeObjCLifetime();
}

if (!lhq.compatiblyIncludes(rhq)) {
  // Treat address-space mismatches as fatal.  TODO: address subspaces
  if (!lhq.isAddressSpaceSupersetOf(rhq))
    ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;

  // It's okay to add or remove GC or lifetime qualifiers when converting to
  // and from void*.
  else if (lhq.withoutObjCGCAttr().withoutObjCLifetime()
                      .compatiblyIncludes(
                              rhq.withoutObjCGCAttr().withoutObjCLifetime())
           && (lhptee->isVoidType() || rhptee->isVoidType()))
    ; // keep old

  // Treat lifetime mismatches as fatal.
  else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
    ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
  
  // For GCC/MS compatibility, other qualifier mismatches are treated
  // as still compatible in C.
  else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
}

// C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
// incomplete type and the other is a pointer to a qualified or unqualified
// version of void...
if (lhptee->isVoidType()) {
  if (rhptee->isIncompleteOrObjectType())
    return ConvTy;

  // As an extension, we allow cast to/from void* to function pointer.
  assert(rhptee->isFunctionType())(static_cast <bool> (rhptee->isFunctionType()) ? void
 (0) : __assert_fail ("rhptee->isFunctionType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7370, __extension__ __PRETTY_FUNCTION__));
  return Sema::FunctionVoidPointer;
}

if (rhptee->isVoidType()) {
  if (lhptee->isIncompleteOrObjectType())
    return ConvTy;

  // As an extension, we allow cast to/from void* to function pointer.
  assert(lhptee->isFunctionType())(static_cast <bool> (lhptee->isFunctionType()) ? void
 (0) : __assert_fail ("lhptee->isFunctionType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7379, __extension__ __PRETTY_FUNCTION__));
  return Sema::FunctionVoidPointer;
}

// C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
// unqualified versions of compatible types, ...
QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
  // Check if the pointee types are compatible ignoring the sign.
  // We explicitly check for char so that we catch "char" vs
  // "unsigned char" on systems where "char" is unsigned.
  if (lhptee->isCharType())
    ltrans = S.Context.UnsignedCharTy;
  else if (lhptee->hasSignedIntegerRepresentation())
    ltrans = S.Context.getCorrespondingUnsignedType(ltrans);

  if (rhptee->isCharType())
    rtrans = S.Context.UnsignedCharTy;
  else if (rhptee->hasSignedIntegerRepresentation())
    rtrans = S.Context.getCorrespondingUnsignedType(rtrans);

  if (ltrans == rtrans) {
    // Types are compatible ignoring the sign. Qualifier incompatibility
    // takes priority over sign incompatibility because the sign
    // warning can be disabled.
    if (ConvTy != Sema::Compatible)
      return ConvTy;

    return Sema::IncompatiblePointerSign;
  }

  // If we are a multi-level pointer, it's possible that our issue is simply
  // one of qualification - e.g. char ** -> const char ** is not allowed. If
  // the eventual target type is the same and the pointers have the same
  // level of indirection, this must be the issue.
  if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
    do {
      lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
      rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
    } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));

    if (lhptee == rhptee)
      return Sema::IncompatibleNestedPointerQualifiers;
  }

  // General pointer incompatibility takes priority over qualifiers.
  return Sema::IncompatiblePointer;
}
if (!S.getLangOpts().CPlusPlus &&
    S.IsFunctionConversion(ltrans, rtrans, ltrans))
  return Sema::IncompatiblePointer;
return ConvTy;
7431}

7433/// checkBlockPointerTypesForAssignment - This routine determines whether two
7434/// block pointer types are compatible or whether a block and normal pointer
7435/// are compatible. It is more restrict than comparing two function pointer
7436// types.
7437static Sema::AssignConvertType
7438checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
                                  QualType RHSType) {
assert(LHSType.isCanonical() && "LHS not canonicalized!")(static_cast <bool> (LHSType.isCanonical() && "LHS not canonicalized!"
) ? void (0) : __assert_fail ("LHSType.isCanonical() && \"LHS not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7440, __extension__ __PRETTY_FUNCTION__));
assert(RHSType.isCanonical() && "RHS not canonicalized!")(static_cast <bool> (RHSType.isCanonical() && "RHS not canonicalized!"
) ? void (0) : __assert_fail ("RHSType.isCanonical() && \"RHS not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7441, __extension__ __PRETTY_FUNCTION__));

QualType lhptee, rhptee;

// get the "pointed to" type (ignoring qualifiers at the top level)
lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();

// In C++, the types have to match exactly.
if (S.getLangOpts().CPlusPlus)
  return Sema::IncompatibleBlockPointer;

Sema::AssignConvertType ConvTy = Sema::Compatible;

// For blocks we enforce that qualifiers are identical.
Qualifiers LQuals = lhptee.getLocalQualifiers();
Qualifiers RQuals = rhptee.getLocalQualifiers();
if (S.getLangOpts().OpenCL) {
  LQuals.removeAddressSpace();
  RQuals.removeAddressSpace();
}
if (LQuals != RQuals)
  ConvTy = Sema::CompatiblePointerDiscardsQualifiers;

// FIXME: OpenCL doesn't define the exact compile time semantics for a block
// assignment.
// The current behavior is similar to C++ lambdas. A block might be
// assigned to a variable iff its return type and parameters are compatible
// (C99 6.2.7) with the corresponding return type and parameters of the LHS of
// an assignment. Presumably it should behave in way that a function pointer
// assignment does in C, so for each parameter and return type:
//  * CVR and address space of LHS should be a superset of CVR and address
//  space of RHS.
//  * unqualified types should be compatible.
if (S.getLangOpts().OpenCL) {
  if (!S.Context.typesAreBlockPointerCompatible(
          S.Context.getQualifiedType(LHSType.getUnqualifiedType(), LQuals),
          S.Context.getQualifiedType(RHSType.getUnqualifiedType(), RQuals)))
    return Sema::IncompatibleBlockPointer;
} else if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
  return Sema::IncompatibleBlockPointer;

return ConvTy;
7484}

7486/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
7487/// for assignment compatibility.
7488static Sema::AssignConvertType
7489checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
                                 QualType RHSType) {
assert(LHSType.isCanonical() && "LHS was not canonicalized!")(static_cast <bool> (LHSType.isCanonical() && "LHS was not canonicalized!"
) ? void (0) : __assert_fail ("LHSType.isCanonical() && \"LHS was not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7491, __extension__ __PRETTY_FUNCTION__));
assert(RHSType.isCanonical() && "RHS was not canonicalized!")(static_cast <bool> (RHSType.isCanonical() && "RHS was not canonicalized!"
) ? void (0) : __assert_fail ("RHSType.isCanonical() && \"RHS was not canonicalized!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7492, __extension__ __PRETTY_FUNCTION__));

if (LHSType->isObjCBuiltinType()) {
  // Class is not compatible with ObjC object pointers.
  if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
      !RHSType->isObjCQualifiedClassType())
    return Sema::IncompatiblePointer;
  return Sema::Compatible;
}
if (RHSType->isObjCBuiltinType()) {
  if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
      !LHSType->isObjCQualifiedClassType())
    return Sema::IncompatiblePointer;
  return Sema::Compatible;
}
QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();

if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
    // make an exception for id<P>
    !LHSType->isObjCQualifiedIdType())
  return Sema::CompatiblePointerDiscardsQualifiers;

if (S.Context.typesAreCompatible(LHSType, RHSType))
  return Sema::Compatible;
if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
  return Sema::IncompatibleObjCQualifiedId;
return Sema::IncompatiblePointer;
7520}

7522Sema::AssignConvertType
7523Sema::CheckAssignmentConstraints(SourceLocation Loc,
                               QualType LHSType, QualType RHSType) {
// Fake up an opaque expression.  We don't actually care about what
// cast operations are required, so if CheckAssignmentConstraints
// adds casts to this they'll be wasted, but fortunately that doesn't
// usually happen on valid code.
OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
ExprResult RHSPtr = &RHSExpr;
CastKind K;

return CheckAssignmentConstraints(LHSType, RHSPtr, K, /*ConvertRHS=*/false);
7534}

7536/// This helper function returns true if QT is a vector type that has element
7537/// type ElementType.
7538static bool isVector(QualType QT, QualType ElementType) {
if (const VectorType *VT = QT->getAs<VectorType>())
  return VT->getElementType() == ElementType;
return false;
7542}

7544/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
7545/// has code to accommodate several GCC extensions when type checking
7546/// pointers. Here are some objectionable examples that GCC considers warnings:
7547///
7548///  int a, *pint;
7549///  short *pshort;
7550///  struct foo *pfoo;
7551///
7552///  pint = pshort; // warning: assignment from incompatible pointer type
7553///  a = pint; // warning: assignment makes integer from pointer without a cast
7554///  pint = a; // warning: assignment makes pointer from integer without a cast
7555///  pint = pfoo; // warning: assignment from incompatible pointer type
7556///
7557/// As a result, the code for dealing with pointers is more complex than the
7558/// C99 spec dictates.
7559///
7560/// Sets 'Kind' for any result kind except Incompatible.
7561Sema::AssignConvertType
7562Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
                               CastKind &Kind, bool ConvertRHS) {
QualType RHSType = RHS.get()->getType();
QualType OrigLHSType = LHSType;

// Get canonical types.  We're not formatting these types, just comparing
// them.
LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();

// Common case: no conversion required.
if (LHSType == RHSType) {
  Kind = CK_NoOp;
  return Compatible;
}

// If we have an atomic type, try a non-atomic assignment, then just add an
// atomic qualification step.
if (const AtomicType *AtomicTy = dyn_cast<AtomicType>(LHSType)) {
  Sema::AssignConvertType result =
    CheckAssignmentConstraints(AtomicTy->getValueType(), RHS, Kind);
  if (result != Compatible)
    return result;
  if (Kind != CK_NoOp && ConvertRHS)
    RHS = ImpCastExprToType(RHS.get(), AtomicTy->getValueType(), Kind);
  Kind = CK_NonAtomicToAtomic;
  return Compatible;
}

// If the left-hand side is a reference type, then we are in a
// (rare!) case where we've allowed the use of references in C,
// e.g., as a parameter type in a built-in function. In this case,
// just make sure that the type referenced is compatible with the
// right-hand side type. The caller is responsible for adjusting
// LHSType so that the resulting expression does not have reference
// type.
if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
  if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
    Kind = CK_LValueBitCast;
    return Compatible;
  }
  return Incompatible;
}

// Allow scalar to ExtVector assignments, and assignments of an ExtVector type
// to the same ExtVector type.
if (LHSType->isExtVectorType()) {
  if (RHSType->isExtVectorType())
    return Incompatible;
  if (RHSType->isArithmeticType()) {
    // CK_VectorSplat does T -> vector T, so first cast to the element type.
    if (ConvertRHS)
      RHS = prepareVectorSplat(LHSType, RHS.get());
    Kind = CK_VectorSplat;
    return Compatible;
  }
}

// Conversions to or from vector type.
if (LHSType->isVectorType() || RHSType->isVectorType()) {
  if (LHSType->isVectorType() && RHSType->isVectorType()) {
    // Allow assignments of an AltiVec vector type to an equivalent GCC
    // vector type and vice versa
    if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
      Kind = CK_BitCast;
      return Compatible;
    }

    // If we are allowing lax vector conversions, and LHS and RHS are both
    // vectors, the total size only needs to be the same. This is a bitcast;
    // no bits are changed but the result type is different.
    if (isLaxVectorConversion(RHSType, LHSType)) {
      Kind = CK_BitCast;
      return IncompatibleVectors;
    }
  }

  // When the RHS comes from another lax conversion (e.g. binops between
  // scalars and vectors) the result is canonicalized as a vector. When the
  // LHS is also a vector, the lax is allowed by the condition above. Handle
  // the case where LHS is a scalar.
  if (LHSType->isScalarType()) {
    const VectorType *VecType = RHSType->getAs<VectorType>();
    if (VecType && VecType->getNumElements() == 1 &&
        isLaxVectorConversion(RHSType, LHSType)) {
      ExprResult *VecExpr = &RHS;
      *VecExpr = ImpCastExprToType(VecExpr->get(), LHSType, CK_BitCast);
      Kind = CK_BitCast;
      return Compatible;
    }
  }

  return Incompatible;
}

// Diagnose attempts to convert between __float128 and long double where
// such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSType, RHSType))
  return Incompatible;

// Disallow assigning a _Complex to a real type in C++ mode since it simply
// discards the imaginary part.
if (getLangOpts().CPlusPlus && RHSType->getAs<ComplexType>() &&
    !LHSType->getAs<ComplexType>())
  return Incompatible;

// Arithmetic conversions.
if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
    !(getLangOpts().CPlusPlus && LHSType->isEnumeralType())) {
  if (ConvertRHS)
    Kind = PrepareScalarCast(RHS, LHSType);
  return Compatible;
}

// Conversions to normal pointers.
if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
  // U* -> T*
  if (isa<PointerType>(RHSType)) {
    LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
    LangAS AddrSpaceR = RHSType->getPointeeType().getAddressSpace();
    Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
    return checkPointerTypesForAssignment(*this, LHSType, RHSType);
  }

  // int -> T*
  if (RHSType->isIntegerType()) {
    Kind = CK_IntegralToPointer; // FIXME: null?
    return IntToPointer;
  }

  // C pointers are not compatible with ObjC object pointers,
  // with two exceptions:
  if (isa<ObjCObjectPointerType>(RHSType)) {
    //  - conversions to void*
    if (LHSPointer->getPointeeType()->isVoidType()) {
      Kind = CK_BitCast;
      return Compatible;
    }

    //  - conversions from 'Class' to the redefinition type
    if (RHSType->isObjCClassType() &&
        Context.hasSameType(LHSType, 
                            Context.getObjCClassRedefinitionType())) {
      Kind = CK_BitCast;
      return Compatible;
    }

    Kind = CK_BitCast;
    return IncompatiblePointer;
  }

  // U^ -> void*
  if (RHSType->getAs<BlockPointerType>()) {
    if (LHSPointer->getPointeeType()->isVoidType()) {
      LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
      LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
                              ->getPointeeType()
                              .getAddressSpace();
      Kind =
          AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
      return Compatible;
    }
  }

  return Incompatible;
}

// Conversions to block pointers.
if (isa<BlockPointerType>(LHSType)) {
  // U^ -> T^
  if (RHSType->isBlockPointerType()) {
    LangAS AddrSpaceL = LHSType->getAs<BlockPointerType>()
                            ->getPointeeType()
                            .getAddressSpace();
    LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
                            ->getPointeeType()
                            .getAddressSpace();
    Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
    return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
  }

  // int or null -> T^
  if (RHSType->isIntegerType()) {
    Kind = CK_IntegralToPointer; // FIXME: null
    return IntToBlockPointer;
  }

  // id -> T^
  if (getLangOpts().ObjC1 && RHSType->isObjCIdType()) {
    Kind = CK_AnyPointerToBlockPointerCast;
    return Compatible;
  }

  // void* -> T^
  if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
    if (RHSPT->getPointeeType()->isVoidType()) {
      Kind = CK_AnyPointerToBlockPointerCast;
      return Compatible;
    }

  return Incompatible;
}

// Conversions to Objective-C pointers.
if (isa<ObjCObjectPointerType>(LHSType)) {
  // A* -> B*
  if (RHSType->isObjCObjectPointerType()) {
    Kind = CK_BitCast;
    Sema::AssignConvertType result = 
      checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
    if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
        result == Compatible && 
        !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
      result = IncompatibleObjCWeakRef;
    return result;
  }

  // int or null -> A*
  if (RHSType->isIntegerType()) {
    Kind = CK_IntegralToPointer; // FIXME: null
    return IntToPointer;
  }

  // In general, C pointers are not compatible with ObjC object pointers,
  // with two exceptions:
  if (isa<PointerType>(RHSType)) {
    Kind = CK_CPointerToObjCPointerCast;

    //  - conversions from 'void*'
    if (RHSType->isVoidPointerType()) {
      return Compatible;
    }

    //  - conversions to 'Class' from its redefinition type
    if (LHSType->isObjCClassType() &&
        Context.hasSameType(RHSType, 
                            Context.getObjCClassRedefinitionType())) {
      return Compatible;
    }

    return IncompatiblePointer;
  }

  // Only under strict condition T^ is compatible with an Objective-C pointer.
  if (RHSType->isBlockPointerType() && 
      LHSType->isBlockCompatibleObjCPointerType(Context)) {
    if (ConvertRHS)
      maybeExtendBlockObject(RHS);
    Kind = CK_BlockPointerToObjCPointerCast;
    return Compatible;
  }

  return Incompatible;
}

// Conversions from pointers that are not covered by the above.
if (isa<PointerType>(RHSType)) {
  // T* -> _Bool
  if (LHSType == Context.BoolTy) {
    Kind = CK_PointerToBoolean;
    return Compatible;
  }

  // T* -> int
  if (LHSType->isIntegerType()) {
    Kind = CK_PointerToIntegral;
    return PointerToInt;
  }

  return Incompatible;
}

// Conversions from Objective-C pointers that are not covered by the above.
if (isa<ObjCObjectPointerType>(RHSType)) {
  // T* -> _Bool
  if (LHSType == Context.BoolTy) {
    Kind = CK_PointerToBoolean;
    return Compatible;
  }

  // T* -> int
  if (LHSType->isIntegerType()) {
    Kind = CK_PointerToIntegral;
    return PointerToInt;
  }

  return Incompatible;
}

// struct A -> struct B
if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
  if (Context.typesAreCompatible(LHSType, RHSType)) {
    Kind = CK_NoOp;
    return Compatible;
  }
}

if (LHSType->isSamplerT() && RHSType->isIntegerType()) {
  Kind = CK_IntToOCLSampler;
  return Compatible;
}

return Incompatible;
7865}

7867/// \brief Constructs a transparent union from an expression that is
7868/// used to initialize the transparent union.
7869static void ConstructTransparentUnion(Sema &S, ASTContext &C,
                                    ExprResult &EResult, QualType UnionType,
                                    FieldDecl *Field) {
// Build an initializer list that designates the appropriate member
// of the transparent union.
Expr *E = EResult.get();
InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
                                                 E, SourceLocation());
Initializer->setType(UnionType);
Initializer->setInitializedFieldInUnion(Field);

// Build a compound literal constructing a value of the transparent
// union type from this initializer list.
TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
EResult = new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
                                      VK_RValue, Initializer, false);
7885}

7887Sema::AssignConvertType
7888Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
                                             ExprResult &RHS) {
QualType RHSType = RHS.get()->getType();

// If the ArgType is a Union type, we want to handle a potential
// transparent_union GCC extension.
const RecordType *UT = ArgType->getAsUnionType();
if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
  return Incompatible;

// The field to initialize within the transparent union.
RecordDecl *UD = UT->getDecl();
FieldDecl *InitField = nullptr;
// It's compatible if the expression matches any of the fields.
for (auto *it : UD->fields()) {
  if (it->getType()->isPointerType()) {
    // If the transparent union contains a pointer type, we allow:
    // 1) void pointer
    // 2) null pointer constant
    if (RHSType->isPointerType())
      if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
        RHS = ImpCastExprToType(RHS.get(), it->getType(), CK_BitCast);
        InitField = it;
        break;
      }

    if (RHS.get()->isNullPointerConstant(Context,
                                         Expr::NPC_ValueDependentIsNull)) {
      RHS = ImpCastExprToType(RHS.get(), it->getType(),
                              CK_NullToPointer);
      InitField = it;
      break;
    }
  }

  CastKind Kind;
  if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
        == Compatible) {
    RHS = ImpCastExprToType(RHS.get(), it->getType(), Kind);
    InitField = it;
    break;
  }
}

if (!InitField)
  return Incompatible;

ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
return Compatible;
7937}

7939Sema::AssignConvertType
7940Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &CallerRHS,
                                     bool Diagnose,
                                     bool DiagnoseCFAudited,
                                     bool ConvertRHS) {
// We need to be able to tell the caller whether we diagnosed a problem, if
// they ask us to issue diagnostics.
assert((ConvertRHS || !Diagnose) && "can't indicate whether we diagnosed")(static_cast <bool> ((ConvertRHS || !Diagnose) &&
 "can't indicate whether we diagnosed") ? void (0) : __assert_fail
 ("(ConvertRHS || !Diagnose) && \"can't indicate whether we diagnosed\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 7946, __extension__ __PRETTY_FUNCTION__));

// If ConvertRHS is false, we want to leave the caller's RHS untouched. Sadly,
// we can't avoid *all* modifications at the moment, so we need some somewhere
// to put the updated value.
ExprResult LocalRHS = CallerRHS;
ExprResult &RHS = ConvertRHS ? CallerRHS : LocalRHS;

if (getLangOpts().CPlusPlus) {
  if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
    // C++ 5.17p3: If the left operand is not of class type, the
    // expression is implicitly converted (C++ 4) to the
    // cv-unqualified type of the left operand.
    QualType RHSType = RHS.get()->getType();
    if (Diagnose) {
      RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
                                      AA_Assigning);
    } else {
      ImplicitConversionSequence ICS =
          TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
                                /*SuppressUserConversions=*/false,
                                /*AllowExplicit=*/false,
                                /*InOverloadResolution=*/false,
                                /*CStyle=*/false,
                                /*AllowObjCWritebackConversion=*/false);
      if (ICS.isFailure())
        return Incompatible;
      RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
                                      ICS, AA_Assigning);
    }
    if (RHS.isInvalid())
      return Incompatible;
    Sema::AssignConvertType result = Compatible;
    if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
        !CheckObjCARCUnavailableWeakConversion(LHSType, RHSType))
      result = IncompatibleObjCWeakRef;
    return result;
  }

  // FIXME: Currently, we fall through and treat C++ classes like C
  // structures.
  // FIXME: We also fall through for atomics; not sure what should
  // happen there, though.
} else if (RHS.get()->getType() == Context.OverloadTy) {
  // As a set of extensions to C, we support overloading on functions. These
  // functions need to be resolved here.
  DeclAccessPair DAP;
  if (FunctionDecl *FD = ResolveAddressOfOverloadedFunction(
          RHS.get(), LHSType, /*Complain=*/false, DAP))
    RHS = FixOverloadedFunctionReference(RHS.get(), DAP, FD);
  else
    return Incompatible;
}

// C99 6.5.16.1p1: the left operand is a pointer and the right is
// a null pointer constant.
if ((LHSType->isPointerType() || LHSType->isObjCObjectPointerType() ||
     LHSType->isBlockPointerType()) &&
    RHS.get()->isNullPointerConstant(Context,
                                     Expr::NPC_ValueDependentIsNull)) {
  if (Diagnose || ConvertRHS) {
    CastKind Kind;
    CXXCastPath Path;
    CheckPointerConversion(RHS.get(), LHSType, Kind, Path,
                           /*IgnoreBaseAccess=*/false, Diagnose);
    if (ConvertRHS)
      RHS = ImpCastExprToType(RHS.get(), LHSType, Kind, VK_RValue, &Path);
  }
  return Compatible;
}

// This check seems unnatural, however it is necessary to ensure the proper
// conversion of functions/arrays. If the conversion were done for all
// DeclExpr's (created by ActOnIdExpression), it would mess up the unary
// expressions that suppress this implicit conversion (&, sizeof).
//
// Suppress this for references: C++ 8.5.3p5.
if (!LHSType->isReferenceType()) {
  // FIXME: We potentially allocate here even if ConvertRHS is false.
  RHS = DefaultFunctionArrayLvalueConversion(RHS.get(), Diagnose);
  if (RHS.isInvalid())
    return Incompatible;
}

Expr *PRE = RHS.get()->IgnoreParenCasts();
if (Diagnose && isa<ObjCProtocolExpr>(PRE)) {
  ObjCProtocolDecl *PDecl = cast<ObjCProtocolExpr>(PRE)->getProtocol();
  if (PDecl && !PDecl->hasDefinition()) {
    Diag(PRE->getExprLoc(), diag::warn_atprotocol_protocol) << PDecl;
    Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl;
  }
}

CastKind Kind;
Sema::AssignConvertType result =
  CheckAssignmentConstraints(LHSType, RHS, Kind, ConvertRHS);

// C99 6.5.16.1p2: The value of the right operand is converted to the
// type of the assignment expression.
// CheckAssignmentConstraints allows the left-hand side to be a reference,
// so that we can use references in built-in functions even in C.
// The getNonReferenceType() call makes sure that the resulting expression
// does not have reference type.
if (result != Incompatible && RHS.get()->getType() != LHSType) {
  QualType Ty = LHSType.getNonLValueExprType(Context);
  Expr *E = RHS.get();

  // Check for various Objective-C errors. If we are not reporting
  // diagnostics and just checking for errors, e.g., during overload
  // resolution, return Incompatible to indicate the failure.
  if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
      CheckObjCConversion(SourceRange(), Ty, E, CCK_ImplicitConversion,
                          Diagnose, DiagnoseCFAudited) != ACR_okay) {
    if (!Diagnose)
      return Incompatible;
  }
  if (getLangOpts().ObjC1 &&
      (CheckObjCBridgeRelatedConversions(E->getLocStart(), LHSType,
                                         E->getType(), E, Diagnose) ||
       ConversionToObjCStringLiteralCheck(LHSType, E, Diagnose))) {
    if (!Diagnose)
      return Incompatible;
    // Replace the expression with a corrected version and continue so we
    // can find further errors.
    RHS = E;
    return Compatible;
  }
  
  if (ConvertRHS)
    RHS = ImpCastExprToType(E, Ty, Kind);
}
return result;
8078}

8080QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
                             ExprResult &RHS) {
Diag(Loc, diag::err_typecheck_invalid_operands)
  << LHS.get()->getType() << RHS.get()->getType()
  << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
8086}

8088// Diagnose cases where a scalar was implicitly converted to a vector and
8089// diagnose the underlying types. Otherwise, diagnose the error
8090// as invalid vector logical operands for non-C++ cases.
8091QualType Sema::InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
                                          ExprResult &RHS) {
QualType LHSType = LHS.get()->IgnoreImpCasts()->getType();
QualType RHSType = RHS.get()->IgnoreImpCasts()->getType();

bool LHSNatVec = LHSType->isVectorType();
bool RHSNatVec = RHSType->isVectorType();

if (!(LHSNatVec && RHSNatVec)) {
  Expr *Vector = LHSNatVec ? LHS.get() : RHS.get();
  Expr *NonVector = !LHSNatVec ? LHS.get() : RHS.get();
  Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
      << 0 << Vector->getType() << NonVector->IgnoreImpCasts()->getType()
      << Vector->getSourceRange();
  return QualType();
}

Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
    << 1 << LHSType << RHSType << LHS.get()->getSourceRange()
    << RHS.get()->getSourceRange();

return QualType();
8113}

8115/// Try to convert a value of non-vector type to a vector type by converting
8116/// the type to the element type of the vector and then performing a splat.
8117/// If the language is OpenCL, we only use conversions that promote scalar
8118/// rank; for C, Obj-C, and C++ we allow any real scalar conversion except
8119/// for float->int.
8120///
8121/// OpenCL V2.0 6.2.6.p2:
8122/// An error shall occur if any scalar operand type has greater rank
8123/// than the type of the vector element.
8124///
8125/// \param scalar - if non-null, actually perform the conversions
8126/// \return true if the operation fails (but without diagnosing the failure)
8127static bool tryVectorConvertAndSplat(Sema &S, ExprResult *scalar,
                                   QualType scalarTy,
                                   QualType vectorEltTy,
                                   QualType vectorTy,
                                   unsigned &DiagID) {
// The conversion to apply to the scalar before splatting it,
// if necessary.
CastKind scalarCast = CK_NoOp;

if (vectorEltTy->isIntegralType(S.Context)) {
  if (S.getLangOpts().OpenCL && (scalarTy->isRealFloatingType() ||
      (scalarTy->isIntegerType() &&
       S.Context.getIntegerTypeOrder(vectorEltTy, scalarTy) < 0))) {
    DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
    return true;
  }
  if (!scalarTy->isIntegralType(S.Context))
    return true;
  scalarCast = CK_IntegralCast;
} else if (vectorEltTy->isRealFloatingType()) {
  if (scalarTy->isRealFloatingType()) {
    if (S.getLangOpts().OpenCL &&
        S.Context.getFloatingTypeOrder(vectorEltTy, scalarTy) < 0) {
      DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
      return true;
    }
    scalarCast = CK_FloatingCast;
  }
  else if (scalarTy->isIntegralType(S.Context))
    scalarCast = CK_IntegralToFloating;
  else
    return true;
} else {
  return true;
}

// Adjust scalar if desired.
if (scalar) {
  if (scalarCast != CK_NoOp)
    *scalar = S.ImpCastExprToType(scalar->get(), vectorEltTy, scalarCast);
  *scalar = S.ImpCastExprToType(scalar->get(), vectorTy, CK_VectorSplat);
}
return false;
8170}

8172/// Convert vector E to a vector with the same number of elements but different
8173/// element type.
8174static ExprResult convertVector(Expr *E, QualType ElementType, Sema &S) {
const auto *VecTy = E->getType()->getAs<VectorType>();
assert(VecTy && "Expression E must be a vector")(static_cast <bool> (VecTy && "Expression E must be a vector"
) ? void (0) : __assert_fail ("VecTy && \"Expression E must be a vector\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8176, __extension__ __PRETTY_FUNCTION__));
QualType NewVecTy = S.Context.getVectorType(ElementType,
                                            VecTy->getNumElements(),
                                            VecTy->getVectorKind());

// Look through the implicit cast. Return the subexpression if its type is
// NewVecTy.
if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
  if (ICE->getSubExpr()->getType() == NewVecTy)
    return ICE->getSubExpr();

auto Cast = ElementType->isIntegerType() ? CK_IntegralCast : CK_FloatingCast;
return S.ImpCastExprToType(E, NewVecTy, Cast);
8189}

8191/// Test if a (constant) integer Int can be casted to another integer type
8192/// IntTy without losing precision.
8193static bool canConvertIntToOtherIntTy(Sema &S, ExprResult *Int,
                                    QualType OtherIntTy) {
QualType IntTy = Int->get()->getType().getUnqualifiedType();

// Reject cases where the value of the Int is unknown as that would
// possibly cause truncation, but accept cases where the scalar can be
// demoted without loss of precision.
llvm::APSInt Result;
bool CstInt = Int->get()->EvaluateAsInt(Result, S.Context);
int Order = S.Context.getIntegerTypeOrder(OtherIntTy, IntTy);
bool IntSigned = IntTy->hasSignedIntegerRepresentation();
bool OtherIntSigned = OtherIntTy->hasSignedIntegerRepresentation();

if (CstInt) {
  // If the scalar is constant and is of a higher order and has more active
  // bits that the vector element type, reject it.
  unsigned NumBits = IntSigned
                         ? (Result.isNegative() ? Result.getMinSignedBits()
                                                : Result.getActiveBits())
                         : Result.getActiveBits();
  if (Order < 0 && S.Context.getIntWidth(OtherIntTy) < NumBits)
    return true;

  // If the signedness of the scalar type and the vector element type
  // differs and the number of bits is greater than that of the vector
  // element reject it.
  return (IntSigned != OtherIntSigned &&
          NumBits > S.Context.getIntWidth(OtherIntTy));
}

// Reject cases where the value of the scalar is not constant and it's
// order is greater than that of the vector element type.
return (Order < 0);
8226}

8228/// Test if a (constant) integer Int can be casted to floating point type
8229/// FloatTy without losing precision.
8230static bool canConvertIntTyToFloatTy(Sema &S, ExprResult *Int,
                                   QualType FloatTy) {
QualType IntTy = Int->get()->getType().getUnqualifiedType();

// Determine if the integer constant can be expressed as a floating point
// number of the appropriate type.
llvm::APSInt Result;
bool CstInt = Int->get()->EvaluateAsInt(Result, S.Context);
uint64_t Bits = 0;
if (CstInt) {
  // Reject constants that would be truncated if they were converted to
  // the floating point type. Test by simple to/from conversion.
  // FIXME: Ideally the conversion to an APFloat and from an APFloat
  //        could be avoided if there was a convertFromAPInt method
  //        which could signal back if implicit truncation occurred.
  llvm::APFloat Float(S.Context.getFloatTypeSemantics(FloatTy));
  Float.convertFromAPInt(Result, IntTy->hasSignedIntegerRepresentation(),
                         llvm::APFloat::rmTowardZero);
  llvm::APSInt ConvertBack(S.Context.getIntWidth(IntTy),
                           !IntTy->hasSignedIntegerRepresentation());
  bool Ignored = false;
  Float.convertToInteger(ConvertBack, llvm::APFloat::rmNearestTiesToEven,
                         &Ignored);
  if (Result != ConvertBack)
    return true;
} else {
  // Reject types that cannot be fully encoded into the mantissa of
  // the float.
  Bits = S.Context.getTypeSize(IntTy);
  unsigned FloatPrec = llvm::APFloat::semanticsPrecision(
      S.Context.getFloatTypeSemantics(FloatTy));
  if (Bits > FloatPrec)
    return true;
}

return false;
8266}

8268/// Attempt to convert and splat Scalar into a vector whose types matches
8269/// Vector following GCC conversion rules. The rule is that implicit
8270/// conversion can occur when Scalar can be casted to match Vector's element
8271/// type without causing truncation of Scalar.
8272static bool tryGCCVectorConvertAndSplat(Sema &S, ExprResult *Scalar,
                                      ExprResult *Vector) {
QualType ScalarTy = Scalar->get()->getType().getUnqualifiedType();
QualType VectorTy = Vector->get()->getType().getUnqualifiedType();
const VectorType *VT = VectorTy->getAs<VectorType>();

assert(!isa<ExtVectorType>(VT) &&(static_cast <bool> (!isa<ExtVectorType>(VT) &&
 "ExtVectorTypes should not be handled here!") ? void (0) : __assert_fail
 ("!isa<ExtVectorType>(VT) && \"ExtVectorTypes should not be handled here!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8279, __extension__ __PRETTY_FUNCTION__))
       "ExtVectorTypes should not be handled here!")(static_cast <bool> (!isa<ExtVectorType>(VT) &&
 "ExtVectorTypes should not be handled here!") ? void (0) : __assert_fail
 ("!isa<ExtVectorType>(VT) && \"ExtVectorTypes should not be handled here!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8279, __extension__ __PRETTY_FUNCTION__));

QualType VectorEltTy = VT->getElementType();

// Reject cases where the vector element type or the scalar element type are
// not integral or floating point types.
if (!VectorEltTy->isArithmeticType() || !ScalarTy->isArithmeticType())
  return true;

// The conversion to apply to the scalar before splatting it,
// if necessary.
CastKind ScalarCast = CK_NoOp;

// Accept cases where the vector elements are integers and the scalar is
// an integer.
// FIXME: Notionally if the scalar was a floating point value with a precise
//        integral representation, we could cast it to an appropriate integer
//        type and then perform the rest of the checks here. GCC will perform
//        this conversion in some cases as determined by the input language.
//        We should accept it on a language independent basis.
if (VectorEltTy->isIntegralType(S.Context) &&
    ScalarTy->isIntegralType(S.Context) &&
    S.Context.getIntegerTypeOrder(VectorEltTy, ScalarTy)) {

  if (canConvertIntToOtherIntTy(S, Scalar, VectorEltTy))
    return true;

  ScalarCast = CK_IntegralCast;
} else if (VectorEltTy->isRealFloatingType()) {
  if (ScalarTy->isRealFloatingType()) {

    // Reject cases where the scalar type is not a constant and has a higher
    // Order than the vector element type.
    llvm::APFloat Result(0.0);
    bool CstScalar = Scalar->get()->EvaluateAsFloat(Result, S.Context);
    int Order = S.Context.getFloatingTypeOrder(VectorEltTy, ScalarTy);
    if (!CstScalar && Order < 0)
      return true;

    // If the scalar cannot be safely casted to the vector element type,
    // reject it.
    if (CstScalar) {
      bool Truncated = false;
      Result.convert(S.Context.getFloatTypeSemantics(VectorEltTy),
                     llvm::APFloat::rmNearestTiesToEven, &Truncated);
      if (Truncated)
        return true;
    }

    ScalarCast = CK_FloatingCast;
  } else if (ScalarTy->isIntegralType(S.Context)) {
    if (canConvertIntTyToFloatTy(S, Scalar, VectorEltTy))
      return true;

    ScalarCast = CK_IntegralToFloating;
  } else
    return true;
}

// Adjust scalar if desired.
if (Scalar) {
  if (ScalarCast != CK_NoOp)
    *Scalar = S.ImpCastExprToType(Scalar->get(), VectorEltTy, ScalarCast);
  *Scalar = S.ImpCastExprToType(Scalar->get(), VectorTy, CK_VectorSplat);
}
return false;
8345}

8347QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
                                 SourceLocation Loc, bool IsCompAssign,
                                 bool AllowBothBool,
                                 bool AllowBoolConversions) {
if (!IsCompAssign) {
  LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
  if (LHS.isInvalid())
    return QualType();
}
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
  return QualType();

// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType = LHS.get()->getType().getUnqualifiedType();
QualType RHSType = RHS.get()->getType().getUnqualifiedType();

const VectorType *LHSVecType = LHSType->getAs<VectorType>();
const VectorType *RHSVecType = RHSType->getAs<VectorType>();
assert(LHSVecType || RHSVecType)(static_cast <bool> (LHSVecType || RHSVecType) ? void (
0) : __assert_fail ("LHSVecType || RHSVecType", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8367, __extension__ __PRETTY_FUNCTION__));

// AltiVec-style "vector bool op vector bool" combinations are allowed
// for some operators but not others.
if (!AllowBothBool &&
    LHSVecType && LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
    RHSVecType && RHSVecType->getVectorKind() == VectorType::AltiVecBool)
  return InvalidOperands(Loc, LHS, RHS);

// If the vector types are identical, return.
if (Context.hasSameType(LHSType, RHSType))
  return LHSType;

// If we have compatible AltiVec and GCC vector types, use the AltiVec type.
if (LHSVecType && RHSVecType &&
    Context.areCompatibleVectorTypes(LHSType, RHSType)) {
  if (isa<ExtVectorType>(LHSVecType)) {
    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
    return LHSType;
  }

  if (!IsCompAssign)
    LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
  return RHSType;
}

// AllowBoolConversions says that bool and non-bool AltiVec vectors
// can be mixed, with the result being the non-bool type.  The non-bool
// operand must have integer element type.
if (AllowBoolConversions && LHSVecType && RHSVecType &&
    LHSVecType->getNumElements() == RHSVecType->getNumElements() &&
    (Context.getTypeSize(LHSVecType->getElementType()) ==
     Context.getTypeSize(RHSVecType->getElementType()))) {
  if (LHSVecType->getVectorKind() == VectorType::AltiVecVector &&
      LHSVecType->getElementType()->isIntegerType() &&
      RHSVecType->getVectorKind() == VectorType::AltiVecBool) {
    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
    return LHSType;
  }
  if (!IsCompAssign &&
      LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
      RHSVecType->getVectorKind() == VectorType::AltiVecVector &&
      RHSVecType->getElementType()->isIntegerType()) {
    LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
    return RHSType;
  }
}

// If there's a vector type and a scalar, try to convert the scalar to
// the vector element type and splat.
unsigned DiagID = diag::err_typecheck_vector_not_convertable;
if (!RHSVecType) {
  if (isa<ExtVectorType>(LHSVecType)) {
    if (!tryVectorConvertAndSplat(*this, &RHS, RHSType,
                                  LHSVecType->getElementType(), LHSType,
                                  DiagID))
      return LHSType;
  } else {
    if (!tryGCCVectorConvertAndSplat(*this, &RHS, &LHS))
      return LHSType;
  }
}
if (!LHSVecType) {
  if (isa<ExtVectorType>(RHSVecType)) {
    if (!tryVectorConvertAndSplat(*this, (IsCompAssign ? nullptr : &LHS),
                                  LHSType, RHSVecType->getElementType(),
                                  RHSType, DiagID))
      return RHSType;
  } else {
    if (LHS.get()->getValueKind() == VK_LValue ||
        !tryGCCVectorConvertAndSplat(*this, &LHS, &RHS))
      return RHSType;
  }
}

// FIXME: The code below also handles conversion between vectors and
// non-scalars, we should break this down into fine grained specific checks
// and emit proper diagnostics.
QualType VecType = LHSVecType ? LHSType : RHSType;
const VectorType *VT = LHSVecType ? LHSVecType : RHSVecType;
QualType OtherType = LHSVecType ? RHSType : LHSType;
ExprResult *OtherExpr = LHSVecType ? &RHS : &LHS;
if (isLaxVectorConversion(OtherType, VecType)) {
  // If we're allowing lax vector conversions, only the total (data) size
  // needs to be the same. For non compound assignment, if one of the types is
  // scalar, the result is always the vector type.
  if (!IsCompAssign) {
    *OtherExpr = ImpCastExprToType(OtherExpr->get(), VecType, CK_BitCast);
    return VecType;
  // In a compound assignment, lhs += rhs, 'lhs' is a lvalue src, forbidding
  // any implicit cast. Here, the 'rhs' should be implicit casted to 'lhs'
  // type. Note that this is already done by non-compound assignments in
  // CheckAssignmentConstraints. If it's a scalar type, only bitcast for
  // <1 x T> -> T. The result is also a vector type.
  } else if (OtherType->isExtVectorType() || OtherType->isVectorType() ||
             (OtherType->isScalarType() && VT->getNumElements() == 1)) {
    ExprResult *RHSExpr = &RHS;
    *RHSExpr = ImpCastExprToType(RHSExpr->get(), LHSType, CK_BitCast);
    return VecType;
  }
}

// Okay, the expression is invalid.

// If there's a non-vector, non-real operand, diagnose that.
if ((!RHSVecType && !RHSType->isRealType()) ||
    (!LHSVecType && !LHSType->isRealType())) {
  Diag(Loc, diag::err_typecheck_vector_not_convertable_non_scalar)
    << LHSType << RHSType
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
  return QualType();
}

// OpenCL V1.1 6.2.6.p1:
// If the operands are of more than one vector type, then an error shall
// occur. Implicit conversions between vector types are not permitted, per
// section 6.2.1.
if (getLangOpts().OpenCL &&
    RHSVecType && isa<ExtVectorType>(RHSVecType) &&
    LHSVecType && isa<ExtVectorType>(LHSVecType)) {
  Diag(Loc, diag::err_opencl_implicit_vector_conversion) << LHSType
                                                         << RHSType;
  return QualType();
}


// If there is a vector type that is not a ExtVector and a scalar, we reach
// this point if scalar could not be converted to the vector's element type
// without truncation.
if ((RHSVecType && !isa<ExtVectorType>(RHSVecType)) ||
    (LHSVecType && !isa<ExtVectorType>(LHSVecType))) {
  QualType Scalar = LHSVecType ? RHSType : LHSType;
  QualType Vector = LHSVecType ? LHSType : RHSType;
  unsigned ScalarOrVector = LHSVecType && RHSVecType ? 1 : 0;
  Diag(Loc,
       diag::err_typecheck_vector_not_convertable_implict_truncation)
      << ScalarOrVector << Scalar << Vector;

  return QualType();
}

// Otherwise, use the generic diagnostic.
Diag(Loc, DiagID)
  << LHSType << RHSType
  << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
8513}

8515// checkArithmeticNull - Detect when a NULL constant is used improperly in an
8516// expression.  These are mainly cases where the null pointer is used as an
8517// integer instead of a pointer.
8518static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
                              SourceLocation Loc, bool IsCompare) {
// The canonical way to check for a GNU null is with isNullPointerConstant,
// but we use a bit of a hack here for speed; this is a relatively
// hot path, and isNullPointerConstant is slow.
bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());

QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();

// Avoid analyzing cases where the result will either be invalid (and
// diagnosed as such) or entirely valid and not something to warn about.
if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
    NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
  return;

// Comparison operations would not make sense with a null pointer no matter
// what the other expression is.
if (!IsCompare) {
  S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
      << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
      << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
  return;
}

// The rest of the operations only make sense with a null pointer
// if the other expression is a pointer.
if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
    NonNullType->canDecayToPointerType())
  return;

S.Diag(Loc, diag::warn_null_in_comparison_operation)
    << LHSNull /* LHS is NULL */ << NonNullType
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
8552}

8554static void DiagnoseBadDivideOrRemainderValues(Sema& S, ExprResult &LHS,
                                             ExprResult &RHS,
                                             SourceLocation Loc, bool IsDiv) {
// Check for division/remainder by zero.
llvm::APSInt RHSValue;
if (!RHS.get()->isValueDependent() &&
    RHS.get()->EvaluateAsInt(RHSValue, S.Context) && RHSValue == 0)
  S.DiagRuntimeBehavior(Loc, RHS.get(),
                        S.PDiag(diag::warn_remainder_division_by_zero)
                          << IsDiv << RHS.get()->getSourceRange());
8564}

8566QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
                                         SourceLocation Loc,
                                         bool IsCompAssign, bool IsDiv) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType())
  return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
                             /*AllowBothBool*/getLangOpts().AltiVec,
                             /*AllowBoolConversions*/false);

QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();


if (compType.isNull() || !compType->isArithmeticType())
  return InvalidOperands(Loc, LHS, RHS);
if (IsDiv)
  DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, IsDiv);
return compType;
8587}

8589QualType Sema::CheckRemainderOperands(
ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  if (LHS.get()->getType()->hasIntegerRepresentation() && 
      RHS.get()->getType()->hasIntegerRepresentation())
    return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
                               /*AllowBothBool*/getLangOpts().AltiVec,
                               /*AllowBoolConversions*/false);
  return InvalidOperands(Loc, LHS, RHS);
}

QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();

if (compType.isNull() || !compType->isIntegerType())
  return InvalidOperands(Loc, LHS, RHS);
DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, false /* IsDiv */);
return compType;
8611}

8613/// \brief Diagnose invalid arithmetic on two void pointers.
8614static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
                                              Expr *LHSExpr, Expr *RHSExpr) {
S.Diag(Loc, S.getLangOpts().CPlusPlus
              ? diag::err_typecheck_pointer_arith_void_type
              : diag::ext_gnu_void_ptr)
  << 1 /* two pointers */ << LHSExpr->getSourceRange()
                          << RHSExpr->getSourceRange();
8621}

8623/// \brief Diagnose invalid arithmetic on a void pointer.
8624static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
                                          Expr *Pointer) {
S.Diag(Loc, S.getLangOpts().CPlusPlus
              ? diag::err_typecheck_pointer_arith_void_type
              : diag::ext_gnu_void_ptr)
  << 0 /* one pointer */ << Pointer->getSourceRange();
8630}

8632/// \brief Diagnose invalid arithmetic on a null pointer.
8633///
8634/// If \p IsGNUIdiom is true, the operation is using the 'p = (i8*)nullptr + n'
8635/// idiom, which we recognize as a GNU extension.
8636///
8637static void diagnoseArithmeticOnNullPointer(Sema &S, SourceLocation Loc,
                                          Expr *Pointer, bool IsGNUIdiom) {
if (IsGNUIdiom)
  S.Diag(Loc, diag::warn_gnu_null_ptr_arith)
    << Pointer->getSourceRange();
else
  S.Diag(Loc, diag::warn_pointer_arith_null_ptr)
    << S.getLangOpts().CPlusPlus << Pointer->getSourceRange();
8645}

8647/// \brief Diagnose invalid arithmetic on two function pointers.
8648static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
                                                  Expr *LHS, Expr *RHS) {
assert(LHS->getType()->isAnyPointerType())(static_cast <bool> (LHS->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("LHS->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8650, __extension__ __PRETTY_FUNCTION__));
assert(RHS->getType()->isAnyPointerType())(static_cast <bool> (RHS->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("RHS->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8651, __extension__ __PRETTY_FUNCTION__));
S.Diag(Loc, S.getLangOpts().CPlusPlus
              ? diag::err_typecheck_pointer_arith_function_type
              : diag::ext_gnu_ptr_func_arith)
  << 1 /* two pointers */ << LHS->getType()->getPointeeType()
  // We only show the second type if it differs from the first.
  << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
                                                 RHS->getType())
  << RHS->getType()->getPointeeType()
  << LHS->getSourceRange() << RHS->getSourceRange();
8661}

8663/// \brief Diagnose invalid arithmetic on a function pointer.
8664static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
                                              Expr *Pointer) {
assert(Pointer->getType()->isAnyPointerType())(static_cast <bool> (Pointer->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("Pointer->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8666, __extension__ __PRETTY_FUNCTION__));
S.Diag(Loc, S.getLangOpts().CPlusPlus
              ? diag::err_typecheck_pointer_arith_function_type
              : diag::ext_gnu_ptr_func_arith)
  << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
  << 0 /* one pointer, so only one type */
  << Pointer->getSourceRange();
8673}

8675/// \brief Emit error if Operand is incomplete pointer type
8676///
8677/// \returns True if pointer has incomplete type
8678static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
                                               Expr *Operand) {
QualType ResType = Operand->getType();
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
  ResType = ResAtomicType->getValueType();

assert(ResType->isAnyPointerType() && !ResType->isDependentType())(static_cast <bool> (ResType->isAnyPointerType() &&
 !ResType->isDependentType()) ? void (0) : __assert_fail (
"ResType->isAnyPointerType() && !ResType->isDependentType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8684, __extension__ __PRETTY_FUNCTION__));
QualType PointeeTy = ResType->getPointeeType();
return S.RequireCompleteType(Loc, PointeeTy,
                             diag::err_typecheck_arithmetic_incomplete_type,
                             PointeeTy, Operand->getSourceRange());
8689}

8691/// \brief Check the validity of an arithmetic pointer operand.
8692///
8693/// If the operand has pointer type, this code will check for pointer types
8694/// which are invalid in arithmetic operations. These will be diagnosed
8695/// appropriately, including whether or not the use is supported as an
8696/// extension.
8697///
8698/// \returns True when the operand is valid to use (even if as an extension).
8699static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
                                          Expr *Operand) {
QualType ResType = Operand->getType();
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
  ResType = ResAtomicType->getValueType();

if (!ResType->isAnyPointerType()) return true;

QualType PointeeTy = ResType->getPointeeType();
if (PointeeTy->isVoidType()) {
  diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
  return !S.getLangOpts().CPlusPlus;
}
if (PointeeTy->isFunctionType()) {
  diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
  return !S.getLangOpts().CPlusPlus;
}

if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;

return true;
8720}

8722/// \brief Check the validity of a binary arithmetic operation w.r.t. pointer
8723/// operands.
8724///
8725/// This routine will diagnose any invalid arithmetic on pointer operands much
8726/// like \see checkArithmeticOpPointerOperand. However, it has special logic
8727/// for emitting a single diagnostic even for operations where both LHS and RHS
8728/// are (potentially problematic) pointers.
8729///
8730/// \returns True when the operand is valid to use (even if as an extension).
8731static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
                                              Expr *LHSExpr, Expr *RHSExpr) {
bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
if (!isLHSPointer && !isRHSPointer) return true;

QualType LHSPointeeTy, RHSPointeeTy;
if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();

// if both are pointers check if operation is valid wrt address spaces
if (S.getLangOpts().OpenCL && isLHSPointer && isRHSPointer) {
  const PointerType *lhsPtr = LHSExpr->getType()->getAs<PointerType>();
  const PointerType *rhsPtr = RHSExpr->getType()->getAs<PointerType>();
  if (!lhsPtr->isAddressSpaceOverlapping(*rhsPtr)) {
    S.Diag(Loc,
           diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
        << LHSExpr->getType() << RHSExpr->getType() << 1 /*arithmetic op*/
        << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
    return false;
  }
}

// Check for arithmetic on pointers to incomplete types.
bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
if (isLHSVoidPtr || isRHSVoidPtr) {
  if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
  else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
  else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);

  return !S.getLangOpts().CPlusPlus;
}

bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
if (isLHSFuncPtr || isRHSFuncPtr) {
  if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
  else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
                                                              RHSExpr);
  else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);

  return !S.getLangOpts().CPlusPlus;
}

if (isLHSPointer && checkArithmeticIncompletePointerType(S, Loc, LHSExpr))
  return false;
if (isRHSPointer && checkArithmeticIncompletePointerType(S, Loc, RHSExpr))
  return false;

return true;
8782}

8784/// diagnoseStringPlusInt - Emit a warning when adding an integer to a string
8785/// literal.
8786static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc,
                                Expr *LHSExpr, Expr *RHSExpr) {
StringLiteral* StrExpr = dyn_cast<StringLiteral>(LHSExpr->IgnoreImpCasts());
Expr* IndexExpr = RHSExpr;
if (!StrExpr) {
  StrExpr = dyn_cast<StringLiteral>(RHSExpr->IgnoreImpCasts());
  IndexExpr = LHSExpr;
}

bool IsStringPlusInt = StrExpr &&
    IndexExpr->getType()->isIntegralOrUnscopedEnumerationType();
if (!IsStringPlusInt || IndexExpr->isValueDependent())
  return;

llvm::APSInt index;
if (IndexExpr->EvaluateAsInt(index, Self.getASTContext())) {
  unsigned StrLenWithNull = StrExpr->getLength() + 1;
  if (index.isNonNegative() &&
      index <= llvm::APSInt(llvm::APInt(index.getBitWidth(), StrLenWithNull),
                            index.isUnsigned()))
    return;
}

SourceRange DiagRange(LHSExpr->getLocStart(), RHSExpr->getLocEnd());
Self.Diag(OpLoc, diag::warn_string_plus_int)
    << DiagRange << IndexExpr->IgnoreImpCasts()->getType();

// Only print a fixit for "str" + int, not for int + "str".
if (IndexExpr == RHSExpr) {
  SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getLocEnd());
  Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
      << FixItHint::CreateInsertion(LHSExpr->getLocStart(), "&")
      << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
      << FixItHint::CreateInsertion(EndLoc, "]");
} else
  Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
8822}

8824/// \brief Emit a warning when adding a char literal to a string.
8825static void diagnoseStringPlusChar(Sema &Self, SourceLocation OpLoc,
                                 Expr *LHSExpr, Expr *RHSExpr) {
const Expr *StringRefExpr = LHSExpr;
const CharacterLiteral *CharExpr =
    dyn_cast<CharacterLiteral>(RHSExpr->IgnoreImpCasts());

if (!CharExpr) {
  CharExpr = dyn_cast<CharacterLiteral>(LHSExpr->IgnoreImpCasts());
  StringRefExpr = RHSExpr;
}

if (!CharExpr || !StringRefExpr)
  return;

const QualType StringType = StringRefExpr->getType();

// Return if not a PointerType.
if (!StringType->isAnyPointerType())
  return;

// Return if not a CharacterType.
if (!StringType->getPointeeType()->isAnyCharacterType())
  return;

ASTContext &Ctx = Self.getASTContext();
SourceRange DiagRange(LHSExpr->getLocStart(), RHSExpr->getLocEnd());

const QualType CharType = CharExpr->getType();
if (!CharType->isAnyCharacterType() &&
    CharType->isIntegerType() &&
    llvm::isUIntN(Ctx.getCharWidth(), CharExpr->getValue())) {
  Self.Diag(OpLoc, diag::warn_string_plus_char)
      << DiagRange << Ctx.CharTy;
} else {
  Self.Diag(OpLoc, diag::warn_string_plus_char)
      << DiagRange << CharExpr->getType();
}

// Only print a fixit for str + char, not for char + str.
if (isa<CharacterLiteral>(RHSExpr->IgnoreImpCasts())) {
  SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getLocEnd());
  Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
      << FixItHint::CreateInsertion(LHSExpr->getLocStart(), "&")
      << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
      << FixItHint::CreateInsertion(EndLoc, "]");
} else {
  Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
}
8873}

8875/// \brief Emit error when two pointers are incompatible.
8876static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
                                         Expr *LHSExpr, Expr *RHSExpr) {
assert(LHSExpr->getType()->isAnyPointerType())(static_cast <bool> (LHSExpr->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("LHSExpr->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8878, __extension__ __PRETTY_FUNCTION__));
assert(RHSExpr->getType()->isAnyPointerType())(static_cast <bool> (RHSExpr->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("RHSExpr->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8879, __extension__ __PRETTY_FUNCTION__));
S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
  << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
  << RHSExpr->getSourceRange();
8883}

8885// C99 6.5.6
8886QualType Sema::CheckAdditionOperands(ExprResult &LHS, ExprResult &RHS,
                                   SourceLocation Loc, BinaryOperatorKind Opc,
                                   QualType* CompLHSTy) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  QualType compType = CheckVectorOperands(
      LHS, RHS, Loc, CompLHSTy,
      /*AllowBothBool*/getLangOpts().AltiVec,
      /*AllowBoolConversions*/getLangOpts().ZVector);
  if (CompLHSTy) *CompLHSTy = compType;
  return compType;
}

QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();

// Diagnose "string literal" '+' int and string '+' "char literal".
if (Opc == BO_Add) {
  diagnoseStringPlusInt(*this, Loc, LHS.get(), RHS.get());
  diagnoseStringPlusChar(*this, Loc, LHS.get(), RHS.get());
}

// handle the common case first (both operands are arithmetic).
if (!compType.isNull() && compType->isArithmeticType()) {
  if (CompLHSTy) *CompLHSTy = compType;
  return compType;
}

// Type-checking.  Ultimately the pointer's going to be in PExp;
// note that we bias towards the LHS being the pointer.
Expr *PExp = LHS.get(), *IExp = RHS.get();

bool isObjCPointer;
if (PExp->getType()->isPointerType()) {
  isObjCPointer = false;
} else if (PExp->getType()->isObjCObjectPointerType()) {
  isObjCPointer = true;
} else {
  std::swap(PExp, IExp);
  if (PExp->getType()->isPointerType()) {
    isObjCPointer = false;
  } else if (PExp->getType()->isObjCObjectPointerType()) {
    isObjCPointer = true;
  } else {
    return InvalidOperands(Loc, LHS, RHS);
  }
}
assert(PExp->getType()->isAnyPointerType())(static_cast <bool> (PExp->getType()->isAnyPointerType
()) ? void (0) : __assert_fail ("PExp->getType()->isAnyPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 8936, __extension__ __PRETTY_FUNCTION__));

if (!IExp->getType()->isIntegerType())
  return InvalidOperands(Loc, LHS, RHS);

// Adding to a null pointer results in undefined behavior.
if (PExp->IgnoreParenCasts()->isNullPointerConstant(
        Context, Expr::NPC_ValueDependentIsNotNull)) {
  // In C++ adding zero to a null pointer is defined.
  llvm::APSInt KnownVal;
  if (!getLangOpts().CPlusPlus ||
      (!IExp->isValueDependent() && 
       (!IExp->EvaluateAsInt(KnownVal, Context) || KnownVal != 0))) {
    // Check the conditions to see if this is the 'p = nullptr + n' idiom.
    bool IsGNUIdiom = BinaryOperator::isNullPointerArithmeticExtension(
        Context, BO_Add, PExp, IExp);
    diagnoseArithmeticOnNullPointer(*this, Loc, PExp, IsGNUIdiom);
  }
}

if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
  return QualType();

if (isObjCPointer && checkArithmeticOnObjCPointer(*this, Loc, PExp))
  return QualType();

// Check array bounds for pointer arithemtic
CheckArrayAccess(PExp, IExp);

if (CompLHSTy) {
  QualType LHSTy = Context.isPromotableBitField(LHS.get());
  if (LHSTy.isNull()) {
    LHSTy = LHS.get()->getType();
    if (LHSTy->isPromotableIntegerType())
      LHSTy = Context.getPromotedIntegerType(LHSTy);
  }
  *CompLHSTy = LHSTy;
}

return PExp->getType();
8976}

8978// C99 6.5.6
8979QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
                                      SourceLocation Loc,
                                      QualType* CompLHSTy) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  QualType compType = CheckVectorOperands(
      LHS, RHS, Loc, CompLHSTy,
      /*AllowBothBool*/getLangOpts().AltiVec,
      /*AllowBoolConversions*/getLangOpts().ZVector);
  if (CompLHSTy) *CompLHSTy = compType;
  return compType;
}

QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();

// Enforce type constraints: C99 6.5.6p3.

// Handle the common case first (both operands are arithmetic).
if (!compType.isNull() && compType->isArithmeticType()) {
  if (CompLHSTy) *CompLHSTy = compType;
  return compType;
}

// Either ptr - int   or   ptr - ptr.
if (LHS.get()->getType()->isAnyPointerType()) {
  QualType lpointee = LHS.get()->getType()->getPointeeType();

  // Diagnose bad cases where we step over interface counts.
  if (LHS.get()->getType()->isObjCObjectPointerType() &&
      checkArithmeticOnObjCPointer(*this, Loc, LHS.get()))
    return QualType();

  // The result type of a pointer-int computation is the pointer type.
  if (RHS.get()->getType()->isIntegerType()) {
    // Subtracting from a null pointer should produce a warning.
    // The last argument to the diagnose call says this doesn't match the
    // GNU int-to-pointer idiom.
    if (LHS.get()->IgnoreParenCasts()->isNullPointerConstant(Context,
                                         Expr::NPC_ValueDependentIsNotNull)) {
      // In C++ adding zero to a null pointer is defined.
      llvm::APSInt KnownVal;
      if (!getLangOpts().CPlusPlus || 
          (!RHS.get()->isValueDependent() &&
           (!RHS.get()->EvaluateAsInt(KnownVal, Context) || KnownVal != 0))) {
        diagnoseArithmeticOnNullPointer(*this, Loc, LHS.get(), false);
      }
    }

    if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
      return QualType();

    // Check array bounds for pointer arithemtic
    CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/nullptr,
                     /*AllowOnePastEnd*/true, /*IndexNegated*/true);

    if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
    return LHS.get()->getType();
  }

  // Handle pointer-pointer subtractions.
  if (const PointerType *RHSPTy
        = RHS.get()->getType()->getAs<PointerType>()) {
    QualType rpointee = RHSPTy->getPointeeType();

    if (getLangOpts().CPlusPlus) {
      // Pointee types must be the same: C++ [expr.add]
      if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
        diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
      }
    } else {
      // Pointee types must be compatible C99 6.5.6p3
      if (!Context.typesAreCompatible(
              Context.getCanonicalType(lpointee).getUnqualifiedType(),
              Context.getCanonicalType(rpointee).getUnqualifiedType())) {
        diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
        return QualType();
      }
    }

    if (!checkArithmeticBinOpPointerOperands(*this, Loc,
                                             LHS.get(), RHS.get()))
      return QualType();

    // FIXME: Add warnings for nullptr - ptr.

    // The pointee type may have zero size.  As an extension, a structure or
    // union may have zero size or an array may have zero length.  In this
    // case subtraction does not make sense.
    if (!rpointee->isVoidType() && !rpointee->isFunctionType()) {
      CharUnits ElementSize = Context.getTypeSizeInChars(rpointee);
      if (ElementSize.isZero()) {
        Diag(Loc,diag::warn_sub_ptr_zero_size_types)
          << rpointee.getUnqualifiedType()
          << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
      }
    }

    if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
    return Context.getPointerDiffType();
  }
}

return InvalidOperands(Loc, LHS, RHS);
9086}

9088static bool isScopedEnumerationType(QualType T) {
if (const EnumType *ET = T->getAs<EnumType>())
  return ET->getDecl()->isScoped();
return false;
9092}

9094static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
                                 SourceLocation Loc, BinaryOperatorKind Opc,
                                 QualType LHSType) {
// OpenCL 6.3j: shift values are effectively % word size of LHS (more defined),
// so skip remaining warnings as we don't want to modify values within Sema.
if (S.getLangOpts().OpenCL)
  return;

llvm::APSInt Right;
// Check right/shifter operand
if (RHS.get()->isValueDependent() ||
    !RHS.get()->EvaluateAsInt(Right, S.Context))
  return;

if (Right.isNegative()) {
  S.DiagRuntimeBehavior(Loc, RHS.get(),
                        S.PDiag(diag::warn_shift_negative)
                          << RHS.get()->getSourceRange());
  return;
}
llvm::APInt LeftBits(Right.getBitWidth(),
                     S.Context.getTypeSize(LHS.get()->getType()));
if (Right.uge(LeftBits)) {
  S.DiagRuntimeBehavior(Loc, RHS.get(),
                        S.PDiag(diag::warn_shift_gt_typewidth)
                          << RHS.get()->getSourceRange());
  return;
}
if (Opc != BO_Shl)
  return;

// When left shifting an ICE which is signed, we can check for overflow which
// according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
// integers have defined behavior modulo one more than the maximum value
// representable in the result type, so never warn for those.
llvm::APSInt Left;
if (LHS.get()->isValueDependent() ||
    LHSType->hasUnsignedIntegerRepresentation() ||
    !LHS.get()->EvaluateAsInt(Left, S.Context))
  return;

// If LHS does not have a signed type and non-negative value
// then, the behavior is undefined. Warn about it.
if (Left.isNegative() && !S.getLangOpts().isSignedOverflowDefined()) {
  S.DiagRuntimeBehavior(Loc, LHS.get(),
                        S.PDiag(diag::warn_shift_lhs_negative)
                          << LHS.get()->getSourceRange());
  return;
}

llvm::APInt ResultBits =
    static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
if (LeftBits.uge(ResultBits))
  return;
llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
Result = Result.shl(Right);

// Print the bit representation of the signed integer as an unsigned
// hexadecimal number.
SmallString<40> HexResult;
Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);

// If we are only missing a sign bit, this is less likely to result in actual
// bugs -- if the result is cast back to an unsigned type, it will have the
// expected value. Thus we place this behind a different warning that can be
// turned off separately if needed.
if (LeftBits == ResultBits - 1) {
  S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
      << HexResult << LHSType
      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
  return;
}

S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
  << HexResult.str() << Result.getMinSignedBits() << LHSType
  << Left.getBitWidth() << LHS.get()->getSourceRange()
  << RHS.get()->getSourceRange();
9171}

9173/// \brief Return the resulting type when a vector is shifted
9174///        by a scalar or vector shift amount.
9175static QualType checkVectorShift(Sema &S, ExprResult &LHS, ExprResult &RHS,
                               SourceLocation Loc, bool IsCompAssign) {
// OpenCL v1.1 s6.3.j says RHS can be a vector only if LHS is a vector.
if ((S.LangOpts.OpenCL || S.LangOpts.ZVector) &&
    !LHS.get()->getType()->isVectorType()) {
  S.Diag(Loc, diag::err_shift_rhs_only_vector)
    << RHS.get()->getType() << LHS.get()->getType()
    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
  return QualType();
}

if (!IsCompAssign) {
  LHS = S.UsualUnaryConversions(LHS.get());
  if (LHS.isInvalid()) return QualType();
}

RHS = S.UsualUnaryConversions(RHS.get());
if (RHS.isInvalid()) return QualType();

QualType LHSType = LHS.get()->getType();
// Note that LHS might be a scalar because the routine calls not only in
// OpenCL case.
const VectorType *LHSVecTy = LHSType->getAs<VectorType>();
QualType LHSEleType = LHSVecTy ? LHSVecTy->getElementType() : LHSType;

// Note that RHS might not be a vector.
QualType RHSType = RHS.get()->getType();
const VectorType *RHSVecTy = RHSType->getAs<VectorType>();
QualType RHSEleType = RHSVecTy ? RHSVecTy->getElementType() : RHSType;

// The operands need to be integers.
if (!LHSEleType->isIntegerType()) {
  S.Diag(Loc, diag::err_typecheck_expect_int)
    << LHS.get()->getType() << LHS.get()->getSourceRange();
  return QualType();
}

if (!RHSEleType->isIntegerType()) {
  S.Diag(Loc, diag::err_typecheck_expect_int)
    << RHS.get()->getType() << RHS.get()->getSourceRange();
  return QualType();
}

if (!LHSVecTy) {
  assert(RHSVecTy)(static_cast <bool> (RHSVecTy) ? void (0) : __assert_fail
 ("RHSVecTy", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9219, __extension__ __PRETTY_FUNCTION__));
  if (IsCompAssign)
    return RHSType;
  if (LHSEleType != RHSEleType) {
    LHS = S.ImpCastExprToType(LHS.get(),RHSEleType, CK_IntegralCast);
    LHSEleType = RHSEleType;
  }
  QualType VecTy =
      S.Context.getExtVectorType(LHSEleType, RHSVecTy->getNumElements());
  LHS = S.ImpCastExprToType(LHS.get(), VecTy, CK_VectorSplat);
  LHSType = VecTy;
} else if (RHSVecTy) {
  // OpenCL v1.1 s6.3.j says that for vector types, the operators
  // are applied component-wise. So if RHS is a vector, then ensure
  // that the number of elements is the same as LHS...
  if (RHSVecTy->getNumElements() != LHSVecTy->getNumElements()) {
    S.Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
      << LHS.get()->getType() << RHS.get()->getType()
      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    return QualType();
  }
  if (!S.LangOpts.OpenCL && !S.LangOpts.ZVector) {
    const BuiltinType *LHSBT = LHSEleType->getAs<clang::BuiltinType>();
    const BuiltinType *RHSBT = RHSEleType->getAs<clang::BuiltinType>();
    if (LHSBT != RHSBT &&
        S.Context.getTypeSize(LHSBT) != S.Context.getTypeSize(RHSBT)) {
      S.Diag(Loc, diag::warn_typecheck_vector_element_sizes_not_equal)
          << LHS.get()->getType() << RHS.get()->getType()
          << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
    }
  }
} else {
  // ...else expand RHS to match the number of elements in LHS.
  QualType VecTy =
    S.Context.getExtVectorType(RHSEleType, LHSVecTy->getNumElements());
  RHS = S.ImpCastExprToType(RHS.get(), VecTy, CK_VectorSplat);
}

return LHSType;
9258}

9260// C99 6.5.7
9261QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
                                SourceLocation Loc, BinaryOperatorKind Opc,
                                bool IsCompAssign) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

// Vector shifts promote their scalar inputs to vector type.
if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  if (LangOpts.ZVector) {
    // The shift operators for the z vector extensions work basically
    // like general shifts, except that neither the LHS nor the RHS is
    // allowed to be a "vector bool".
    if (auto LHSVecType = LHS.get()->getType()->getAs<VectorType>())
      if (LHSVecType->getVectorKind() == VectorType::AltiVecBool)
        return InvalidOperands(Loc, LHS, RHS);
    if (auto RHSVecType = RHS.get()->getType()->getAs<VectorType>())
      if (RHSVecType->getVectorKind() == VectorType::AltiVecBool)
        return InvalidOperands(Loc, LHS, RHS);
  }
  return checkVectorShift(*this, LHS, RHS, Loc, IsCompAssign);
}

// Shifts don't perform usual arithmetic conversions, they just do integer
// promotions on each operand. C99 6.5.7p3

// For the LHS, do usual unary conversions, but then reset them away
// if this is a compound assignment.
ExprResult OldLHS = LHS;
LHS = UsualUnaryConversions(LHS.get());
if (LHS.isInvalid())
  return QualType();
QualType LHSType = LHS.get()->getType();
if (IsCompAssign) LHS = OldLHS;

// The RHS is simpler.
RHS = UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
  return QualType();
QualType RHSType = RHS.get()->getType();

// C99 6.5.7p2: Each of the operands shall have integer type.
if (!LHSType->hasIntegerRepresentation() ||
    !RHSType->hasIntegerRepresentation())
  return InvalidOperands(Loc, LHS, RHS);

// C++0x: Don't allow scoped enums. FIXME: Use something better than
// hasIntegerRepresentation() above instead of this.
if (isScopedEnumerationType(LHSType) ||
    isScopedEnumerationType(RHSType)) {
  return InvalidOperands(Loc, LHS, RHS);
}
// Sanity-check shift operands
DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);

// "The type of the result is that of the promoted left operand."
return LHSType;
9317}

9319/// If two different enums are compared, raise a warning.
9320static void checkEnumComparison(Sema &S, SourceLocation Loc, Expr *LHS,
                              Expr *RHS) {
QualType LHSStrippedType = LHS->IgnoreParenImpCasts()->getType();
QualType RHSStrippedType = RHS->IgnoreParenImpCasts()->getType();

const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>();
if (!LHSEnumType)
  return;
const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>();
if (!RHSEnumType)
  return;

// Ignore anonymous enums.
if (!LHSEnumType->getDecl()->getIdentifier() &&
    !LHSEnumType->getDecl()->getTypedefNameForAnonDecl())
  return;
if (!RHSEnumType->getDecl()->getIdentifier() &&
    !RHSEnumType->getDecl()->getTypedefNameForAnonDecl())
  return;

if (S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType))
  return;

S.Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
    << LHSStrippedType << RHSStrippedType
    << LHS->getSourceRange() << RHS->getSourceRange();
9346}

9348/// \brief Diagnose bad pointer comparisons.
9349static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
                                            ExprResult &LHS, ExprResult &RHS,
                                            bool IsError) {
S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
                    : diag::ext_typecheck_comparison_of_distinct_pointers)
  << LHS.get()->getType() << RHS.get()->getType()
  << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9356}

9358/// \brief Returns false if the pointers are converted to a composite type,
9359/// true otherwise.
9360static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
                                         ExprResult &LHS, ExprResult &RHS) {
// C++ [expr.rel]p2:
//   [...] Pointer conversions (4.10) and qualification
//   conversions (4.4) are performed on pointer operands (or on
//   a pointer operand and a null pointer constant) to bring
//   them to their composite pointer type. [...]
//
// C++ [expr.eq]p1 uses the same notion for (in)equality
// comparisons of pointers.

QualType LHSType = LHS.get()->getType();
QualType RHSType = RHS.get()->getType();
assert(LHSType->isPointerType() || RHSType->isPointerType() ||(static_cast <bool> (LHSType->isPointerType() || RHSType
->isPointerType() || LHSType->isMemberPointerType() || RHSType
->isMemberPointerType()) ? void (0) : __assert_fail ("LHSType->isPointerType() || RHSType->isPointerType() || LHSType->isMemberPointerType() || RHSType->isMemberPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9374, __extension__ __PRETTY_FUNCTION__))
       LHSType->isMemberPointerType() || RHSType->isMemberPointerType())(static_cast <bool> (LHSType->isPointerType() || RHSType
->isPointerType() || LHSType->isMemberPointerType() || RHSType
->isMemberPointerType()) ? void (0) : __assert_fail ("LHSType->isPointerType() || RHSType->isPointerType() || LHSType->isMemberPointerType() || RHSType->isMemberPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9374, __extension__ __PRETTY_FUNCTION__));

QualType T = S.FindCompositePointerType(Loc, LHS, RHS);
if (T.isNull()) {
  if ((LHSType->isPointerType() || LHSType->isMemberPointerType()) &&
      (RHSType->isPointerType() || RHSType->isMemberPointerType()))
    diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
  else
    S.InvalidOperands(Loc, LHS, RHS);
  return true;
}

LHS = S.ImpCastExprToType(LHS.get(), T, CK_BitCast);
RHS = S.ImpCastExprToType(RHS.get(), T, CK_BitCast);
return false;
9389}

9391static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
                                                  ExprResult &LHS,
                                                  ExprResult &RHS,
                                                  bool IsError) {
S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
                    : diag::ext_typecheck_comparison_of_fptr_to_void)
  << LHS.get()->getType() << RHS.get()->getType()
  << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9399}

9401static bool isObjCObjectLiteral(ExprResult &E) {
switch (E.get()->IgnoreParenImpCasts()->getStmtClass()) {
case Stmt::ObjCArrayLiteralClass:
case Stmt::ObjCDictionaryLiteralClass:
case Stmt::ObjCStringLiteralClass:
case Stmt::ObjCBoxedExprClass:
  return true;
default:
  // Note that ObjCBoolLiteral is NOT an object literal!
  return false;
}
9412}

9414static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS) {
const ObjCObjectPointerType *Type =
  LHS->getType()->getAs<ObjCObjectPointerType>();

// If this is not actually an Objective-C object, bail out.
if (!Type)
  return false;

// Get the LHS object's interface type.
QualType InterfaceType = Type->getPointeeType();

// If the RHS isn't an Objective-C object, bail out.
if (!RHS->getType()->isObjCObjectPointerType())
  return false;

// Try to find the -isEqual: method.
Selector IsEqualSel = S.NSAPIObj->getIsEqualSelector();
ObjCMethodDecl *Method = S.LookupMethodInObjectType(IsEqualSel,
                                                    InterfaceType,
                                                    /*instance=*/true);
if (!Method) {
  if (Type->isObjCIdType()) {
    // For 'id', just check the global pool.
    Method = S.LookupInstanceMethodInGlobalPool(IsEqualSel, SourceRange(),
                                                /*receiverId=*/true);
  } else {
    // Check protocols.
    Method = S.LookupMethodInQualifiedType(IsEqualSel, Type,
                                           /*instance=*/true);
  }
}

if (!Method)
  return false;

QualType T = Method->parameters()[0]->getType();
if (!T->isObjCObjectPointerType())
  return false;

QualType R = Method->getReturnType();
if (!R->isScalarType())
  return false;

return true;
9458}

9460Sema::ObjCLiteralKind Sema::CheckLiteralKind(Expr *FromE) {
FromE = FromE->IgnoreParenImpCasts();
switch (FromE->getStmtClass()) {
  default:
    break;
  case Stmt::ObjCStringLiteralClass:
    // "string literal"
    return LK_String;
  case Stmt::ObjCArrayLiteralClass:
    // "array literal"
    return LK_Array;
  case Stmt::ObjCDictionaryLiteralClass:
    // "dictionary literal"
    return LK_Dictionary;
  case Stmt::BlockExprClass:
    return LK_Block;
  case Stmt::ObjCBoxedExprClass: {
    Expr *Inner = cast<ObjCBoxedExpr>(FromE)->getSubExpr()->IgnoreParens();
    switch (Inner->getStmtClass()) {
      case Stmt::IntegerLiteralClass:
      case Stmt::FloatingLiteralClass:
      case Stmt::CharacterLiteralClass:
      case Stmt::ObjCBoolLiteralExprClass:
      case Stmt::CXXBoolLiteralExprClass:
        // "numeric literal"
        return LK_Numeric;
      case Stmt::ImplicitCastExprClass: {
        CastKind CK = cast<CastExpr>(Inner)->getCastKind();
        // Boolean literals can be represented by implicit casts.
        if (CK == CK_IntegralToBoolean || CK == CK_IntegralCast)
          return LK_Numeric;
        break;
      }
      default:
        break;
    }
    return LK_Boxed;
  }
}
return LK_None;
9500}

9502static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc,
                                        ExprResult &LHS, ExprResult &RHS,
                                        BinaryOperator::Opcode Opc){
Expr *Literal;
Expr *Other;
if (isObjCObjectLiteral(LHS)) {
  Literal = LHS.get();
  Other = RHS.get();
} else {
  Literal = RHS.get();
  Other = LHS.get();
}

// Don't warn on comparisons against nil.
Other = Other->IgnoreParenCasts();
if (Other->isNullPointerConstant(S.getASTContext(),
                                 Expr::NPC_ValueDependentIsNotNull))
  return;

// This should be kept in sync with warn_objc_literal_comparison.
// LK_String should always be after the other literals, since it has its own
// warning flag.
Sema::ObjCLiteralKind LiteralKind = S.CheckLiteralKind(Literal);
assert(LiteralKind != Sema::LK_Block)(static_cast <bool> (LiteralKind != Sema::LK_Block) ? void
 (0) : __assert_fail ("LiteralKind != Sema::LK_Block", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9525, __extension__ __PRETTY_FUNCTION__));
if (LiteralKind == Sema::LK_None) {
  llvm_unreachable("Unknown Objective-C object literal kind")::llvm::llvm_unreachable_internal("Unknown Objective-C object literal kind"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9527);
}

if (LiteralKind == Sema::LK_String)
  S.Diag(Loc, diag::warn_objc_string_literal_comparison)
    << Literal->getSourceRange();
else
  S.Diag(Loc, diag::warn_objc_literal_comparison)
    << LiteralKind << Literal->getSourceRange();

if (BinaryOperator::isEqualityOp(Opc) &&
    hasIsEqualMethod(S, LHS.get(), RHS.get())) {
  SourceLocation Start = LHS.get()->getLocStart();
  SourceLocation End = S.getLocForEndOfToken(RHS.get()->getLocEnd());
  CharSourceRange OpRange =
    CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));

  S.Diag(Loc, diag::note_objc_literal_comparison_isequal)
    << FixItHint::CreateInsertion(Start, Opc == BO_EQ ? "[" : "![")
    << FixItHint::CreateReplacement(OpRange, " isEqual:")
    << FixItHint::CreateInsertion(End, "]");
}
9549}

9551/// Warns on !x < y, !x & y where !(x < y), !(x & y) was probably intended.
9552static void diagnoseLogicalNotOnLHSofCheck(Sema &S, ExprResult &LHS,
                                         ExprResult &RHS, SourceLocation Loc,
                                         BinaryOperatorKind Opc) {
// Check that left hand side is !something.
UnaryOperator *UO = dyn_cast<UnaryOperator>(LHS.get()->IgnoreImpCasts());
if (!UO || UO->getOpcode() != UO_LNot) return;

// Only check if the right hand side is non-bool arithmetic type.
if (RHS.get()->isKnownToHaveBooleanValue()) return;

// Make sure that the something in !something is not bool.
Expr *SubExpr = UO->getSubExpr()->IgnoreImpCasts();
if (SubExpr->isKnownToHaveBooleanValue()) return;

// Emit warning.
bool IsBitwiseOp = Opc == BO_And || Opc == BO_Or || Opc == BO_Xor;
S.Diag(UO->getOperatorLoc(), diag::warn_logical_not_on_lhs_of_check)
    << Loc << IsBitwiseOp;

// First note suggest !(x < y)
SourceLocation FirstOpen = SubExpr->getLocStart();
SourceLocation FirstClose = RHS.get()->getLocEnd();
FirstClose = S.getLocForEndOfToken(FirstClose);
if (FirstClose.isInvalid())
  FirstOpen = SourceLocation();
S.Diag(UO->getOperatorLoc(), diag::note_logical_not_fix)
    << IsBitwiseOp
    << FixItHint::CreateInsertion(FirstOpen, "(")
    << FixItHint::CreateInsertion(FirstClose, ")");

// Second note suggests (!x) < y
SourceLocation SecondOpen = LHS.get()->getLocStart();
SourceLocation SecondClose = LHS.get()->getLocEnd();
SecondClose = S.getLocForEndOfToken(SecondClose);
if (SecondClose.isInvalid())
  SecondOpen = SourceLocation();
S.Diag(UO->getOperatorLoc(), diag::note_logical_not_silence_with_parens)
    << FixItHint::CreateInsertion(SecondOpen, "(")
    << FixItHint::CreateInsertion(SecondClose, ")");
9591}

9593// Get the decl for a simple expression: a reference to a variable,
9594// an implicit C++ field reference, or an implicit ObjC ivar reference.
9595static ValueDecl *getCompareDecl(Expr *E) {
if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E))
  return DR->getDecl();
if (ObjCIvarRefExpr *Ivar = dyn_cast<ObjCIvarRefExpr>(E)) {
  if (Ivar->isFreeIvar())
    return Ivar->getDecl();
}
if (MemberExpr *Mem = dyn_cast<MemberExpr>(E)) {
  if (Mem->isImplicitAccess())
    return Mem->getMemberDecl();
}
return nullptr;
9607}

9609/// Diagnose some forms of syntactically-obvious tautological comparison.
9610static void diagnoseTautologicalComparison(Sema &S, SourceLocation Loc,
                                         Expr *LHS, Expr *RHS,
                                         BinaryOperatorKind Opc) {
Expr *LHSStripped = LHS->IgnoreParenImpCasts();
Expr *RHSStripped = RHS->IgnoreParenImpCasts();

QualType LHSType = LHS->getType();
if (LHSType->hasFloatingRepresentation() ||
    (LHSType->isBlockPointerType() && !BinaryOperator::isEqualityOp(Opc)) ||
    LHS->getLocStart().isMacroID() || RHS->getLocStart().isMacroID() ||
    S.inTemplateInstantiation())
  return;

// For non-floating point types, check for self-comparisons of the form
// x == x, x != x, x < x, etc.  These always evaluate to a constant, and
// often indicate logic errors in the program.
//
// NOTE: Don't warn about comparison expressions resulting from macro
// expansion. Also don't warn about comparisons which are only self
// comparisons within a template instantiation. The warnings should catch
// obvious cases in the definition of the template anyways. The idea is to
// warn when the typed comparison operator will always evaluate to the same
// result.
ValueDecl *DL = getCompareDecl(LHSStripped);
ValueDecl *DR = getCompareDecl(RHSStripped);
if (DL && DR && declaresSameEntity(DL, DR)) {
  StringRef Result;
  switch (Opc) {
  case BO_EQ: case BO_LE: case BO_GE:
    Result = "true";
    break;
  case BO_NE: case BO_LT: case BO_GT:
    Result = "false";
    break;
  case BO_Cmp:
    Result = "'std::strong_ordering::equal'";
    break;
  default:
    break;
  }
  S.DiagRuntimeBehavior(Loc, nullptr,
                        S.PDiag(diag::warn_comparison_always)
                            << 0 /*self-comparison*/ << !Result.empty()
                            << Result);
} else if (DL && DR &&
           DL->getType()->isArrayType() && DR->getType()->isArrayType() &&
           !DL->isWeak() && !DR->isWeak()) {
  // What is it always going to evaluate to?
  StringRef Result;
  switch(Opc) {
  case BO_EQ: // e.g. array1 == array2
    Result = "false";
    break;
  case BO_NE: // e.g. array1 != array2
    Result = "true";
    break;
  default: // e.g. array1 <= array2
    // The best we can say is 'a constant'
    break;
  }
  S.DiagRuntimeBehavior(Loc, nullptr,
                        S.PDiag(diag::warn_comparison_always)
                            << 1 /*array comparison*/
                            << !Result.empty() << Result);
}

if (isa<CastExpr>(LHSStripped))
  LHSStripped = LHSStripped->IgnoreParenCasts();
if (isa<CastExpr>(RHSStripped))
  RHSStripped = RHSStripped->IgnoreParenCasts();

// Warn about comparisons against a string constant (unless the other
// operand is null); the user probably wants strcmp.
Expr *LiteralString = nullptr;
Expr *LiteralStringStripped = nullptr;
if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
    !RHSStripped->isNullPointerConstant(S.Context,
                                        Expr::NPC_ValueDependentIsNull)) {
  LiteralString = LHS;
  LiteralStringStripped = LHSStripped;
} else if ((isa<StringLiteral>(RHSStripped) ||
            isa<ObjCEncodeExpr>(RHSStripped)) &&
           !LHSStripped->isNullPointerConstant(S.Context,
                                        Expr::NPC_ValueDependentIsNull)) {
  LiteralString = RHS;
  LiteralStringStripped = RHSStripped;
}

if (LiteralString) {
  S.DiagRuntimeBehavior(Loc, nullptr,
                        S.PDiag(diag::warn_stringcompare)
                            << isa<ObjCEncodeExpr>(LiteralStringStripped)
                            << LiteralString->getSourceRange());
}
9704}

9706static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS,
                                               ExprResult &RHS,
                                               SourceLocation Loc,
                                               BinaryOperatorKind Opc) {
// C99 6.5.8p3 / C99 6.5.9p4
QualType Type = S.UsualArithmeticConversions(LHS, RHS);
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();
if (Type.isNull())
  return S.InvalidOperands(Loc, LHS, RHS);
assert(Type->isArithmeticType() || Type->isEnumeralType())(static_cast <bool> (Type->isArithmeticType() || Type
->isEnumeralType()) ? void (0) : __assert_fail ("Type->isArithmeticType() || Type->isEnumeralType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 9716, __extension__ __PRETTY_FUNCTION__));

checkEnumComparison(S, Loc, LHS.get(), RHS.get());

enum { StrongEquality, PartialOrdering, StrongOrdering } Ordering;
if (Type->isAnyComplexType())
  Ordering = StrongEquality;
else if (Type->isFloatingType())
  Ordering = PartialOrdering;
else
  Ordering = StrongOrdering;

if (Ordering == StrongEquality && BinaryOperator::isRelationalOp(Opc))
  return S.InvalidOperands(Loc, LHS, RHS);

// Check for comparisons of floating point operands using != and ==.
if (Type->hasFloatingRepresentation() && BinaryOperator::isEqualityOp(Opc))
  S.CheckFloatComparison(Loc, LHS.get(), RHS.get());

// The result of comparisons is 'bool' in C++, 'int' in C.
// FIXME: For BO_Cmp, return the relevant comparison category type.
return S.Context.getLogicalOperationType();
9738}

9740// C99 6.5.8, C++ [expr.rel]
9741QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
                                  SourceLocation Loc, BinaryOperatorKind Opc,
                                  bool IsRelational) {
// Comparisons expect an rvalue, so convert to rvalue before any
// type-related checks.
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
  return QualType();
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
  return QualType();

checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/true);

// Handle vector comparisons separately.
if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType())
  return CheckVectorCompareOperands(LHS, RHS, Loc, Opc);

diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);

QualType LHSType = LHS.get()->getType();
QualType RHSType = RHS.get()->getType();
if ((LHSType->isArithmeticType() || LHSType->isEnumeralType()) &&
    (RHSType->isArithmeticType() || RHSType->isEnumeralType()))
  return checkArithmeticOrEnumeralCompare(*this, LHS, RHS, Loc, Opc);

QualType ResultTy = Context.getLogicalOperationType();

const Expr::NullPointerConstantKind LHSNullKind =
    LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
const Expr::NullPointerConstantKind RHSNullKind =
    RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
bool LHSIsNull = LHSNullKind != Expr::NPCK_NotNull;
bool RHSIsNull = RHSNullKind != Expr::NPCK_NotNull;

if (!IsRelational && LHSIsNull != RHSIsNull) {
  bool IsEquality = Opc == BO_EQ;
  if (RHSIsNull)
    DiagnoseAlwaysNonNullPointer(LHS.get(), RHSNullKind, IsEquality,
                                 RHS.get()->getSourceRange());
  else
    DiagnoseAlwaysNonNullPointer(RHS.get(), LHSNullKind, IsEquality,
                                 LHS.get()->getSourceRange());
}

if ((LHSType->isIntegerType() && !LHSIsNull) ||
    (RHSType->isIntegerType() && !RHSIsNull)) {
  // Skip normal pointer conversion checks in this case; we have better
  // diagnostics for this below.
} else if (getLangOpts().CPlusPlus) {
  // Equality comparison of a function pointer to a void pointer is invalid,
  // but we allow it as an extension.
  // FIXME: If we really want to allow this, should it be part of composite
  // pointer type computation so it works in conditionals too?
  if (!IsRelational &&
      ((LHSType->isFunctionPointerType() && RHSType->isVoidPointerType()) ||
       (RHSType->isFunctionPointerType() && LHSType->isVoidPointerType()))) {
    // This is a gcc extension compatibility comparison.
    // In a SFINAE context, we treat this as a hard error to maintain
    // conformance with the C++ standard.
    diagnoseFunctionPointerToVoidComparison(
        *this, Loc, LHS, RHS, /*isError*/ (bool)isSFINAEContext());
    
    if (isSFINAEContext())
      return QualType();
    
    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
    return ResultTy;
  }

  // C++ [expr.eq]p2:
  //   If at least one operand is a pointer [...] bring them to their
  //   composite pointer type.
  // C++ [expr.rel]p2:
  //   If both operands are pointers, [...] bring them to their composite
  //   pointer type.
  if ((int)LHSType->isPointerType() + (int)RHSType->isPointerType() >=
          (IsRelational ? 2 : 1) &&
      (!LangOpts.ObjCAutoRefCount ||
       !(LHSType->isObjCObjectPointerType() ||
         RHSType->isObjCObjectPointerType()))) {
    if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
      return QualType();
    else
      return ResultTy;
  }
} else if (LHSType->isPointerType() &&
           RHSType->isPointerType()) { // C99 6.5.8p2
  // All of the following pointer-related warnings are GCC extensions, except
  // when handling null pointer constants.
  QualType LCanPointeeTy =
    LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
  QualType RCanPointeeTy =
    RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();

  // C99 6.5.9p2 and C99 6.5.8p2
  if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
                                 RCanPointeeTy.getUnqualifiedType())) {
    // Valid unless a relational comparison of function pointers
    if (IsRelational && LCanPointeeTy->isFunctionType()) {
      Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
        << LHSType << RHSType << LHS.get()->getSourceRange()
        << RHS.get()->getSourceRange();
    }
  } else if (!IsRelational &&
             (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
    // Valid unless comparison between non-null pointer and function pointer
    if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
        && !LHSIsNull && !RHSIsNull)
      diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
                                              /*isError*/false);
  } else {
    // Invalid
    diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
  }
  if (LCanPointeeTy != RCanPointeeTy) {
    // Treat NULL constant as a special case in OpenCL.
    if (getLangOpts().OpenCL && !LHSIsNull && !RHSIsNull) {
      const PointerType *LHSPtr = LHSType->getAs<PointerType>();
      if (!LHSPtr->isAddressSpaceOverlapping(*RHSType->getAs<PointerType>())) {
        Diag(Loc,
             diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
            << LHSType << RHSType << 0 /* comparison */
            << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
      }
    }
    LangAS AddrSpaceL = LCanPointeeTy.getAddressSpace();
    LangAS AddrSpaceR = RCanPointeeTy.getAddressSpace();
    CastKind Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion
                                             : CK_BitCast;
    if (LHSIsNull && !RHSIsNull)
      LHS = ImpCastExprToType(LHS.get(), RHSType, Kind);
    else
      RHS = ImpCastExprToType(RHS.get(), LHSType, Kind);
  }
  return ResultTy;
}

if (getLangOpts().CPlusPlus) {
  // C++ [expr.eq]p4:
  //   Two operands of type std::nullptr_t or one operand of type
  //   std::nullptr_t and the other a null pointer constant compare equal.
  if (!IsRelational && LHSIsNull && RHSIsNull) {
    if (LHSType->isNullPtrType()) {
      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
      return ResultTy;
    }
    if (RHSType->isNullPtrType()) {
      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
      return ResultTy;
    }
  }

  // Comparison of Objective-C pointers and block pointers against nullptr_t.
  // These aren't covered by the composite pointer type rules.
  if (!IsRelational && RHSType->isNullPtrType() &&
      (LHSType->isObjCObjectPointerType() || LHSType->isBlockPointerType())) {
    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
    return ResultTy;
  }
  if (!IsRelational && LHSType->isNullPtrType() &&
      (RHSType->isObjCObjectPointerType() || RHSType->isBlockPointerType())) {
    LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
    return ResultTy;
  }

  if (IsRelational &&
      ((LHSType->isNullPtrType() && RHSType->isPointerType()) ||
       (RHSType->isNullPtrType() && LHSType->isPointerType()))) {
    // HACK: Relational comparison of nullptr_t against a pointer type is
    // invalid per DR583, but we allow it within std::less<> and friends,
    // since otherwise common uses of it break.
    // FIXME: Consider removing this hack once LWG fixes std::less<> and
    // friends to have std::nullptr_t overload candidates.
    DeclContext *DC = CurContext;
    if (isa<FunctionDecl>(DC))
      DC = DC->getParent();
    if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
      if (CTSD->isInStdNamespace() &&
          llvm::StringSwitch<bool>(CTSD->getName())
              .Cases("less", "less_equal", "greater", "greater_equal", true)
              .Default(false)) {
        if (RHSType->isNullPtrType())
          RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
        else
          LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
        return ResultTy;
      }
    }
  }

  // C++ [expr.eq]p2:
  //   If at least one operand is a pointer to member, [...] bring them to
  //   their composite pointer type.
  if (!IsRelational &&
      (LHSType->isMemberPointerType() || RHSType->isMemberPointerType())) {
    if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
      return QualType();
    else
      return ResultTy;
  }
}

// Handle block pointer types.
if (!IsRelational && LHSType->isBlockPointerType() &&
    RHSType->isBlockPointerType()) {
  QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
  QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();

  if (!LHSIsNull && !RHSIsNull &&
      !Context.typesAreCompatible(lpointee, rpointee)) {
    Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
      << LHSType << RHSType << LHS.get()->getSourceRange()
      << RHS.get()->getSourceRange();
  }
  RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
  return ResultTy;
}

// Allow block pointers to be compared with null pointer constants.
if (!IsRelational
    && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
        || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
  if (!LHSIsNull && !RHSIsNull) {
    if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
           ->getPointeeType()->isVoidType())
          || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
              ->getPointeeType()->isVoidType())))
      Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
        << LHSType << RHSType << LHS.get()->getSourceRange()
        << RHS.get()->getSourceRange();
  }
  if (LHSIsNull && !RHSIsNull)
    LHS = ImpCastExprToType(LHS.get(), RHSType,
                            RHSType->isPointerType() ? CK_BitCast
                              : CK_AnyPointerToBlockPointerCast);
  else
    RHS = ImpCastExprToType(RHS.get(), LHSType,
                            LHSType->isPointerType() ? CK_BitCast
                              : CK_AnyPointerToBlockPointerCast);
  return ResultTy;
}

if (LHSType->isObjCObjectPointerType() ||
    RHSType->isObjCObjectPointerType()) {
  const PointerType *LPT = LHSType->getAs<PointerType>();
  const PointerType *RPT = RHSType->getAs<PointerType>();
  if (LPT || RPT) {
    bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
    bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;

    if (!LPtrToVoid && !RPtrToVoid &&
        !Context.typesAreCompatible(LHSType, RHSType)) {
      diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
                                        /*isError*/false);
    }
    if (LHSIsNull && !RHSIsNull) {
      Expr *E = LHS.get();
      if (getLangOpts().ObjCAutoRefCount)
        CheckObjCConversion(SourceRange(), RHSType, E,
                            CCK_ImplicitConversion);
      LHS = ImpCastExprToType(E, RHSType,
                              RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
    }
    else {
      Expr *E = RHS.get();
      if (getLangOpts().ObjCAutoRefCount)
        CheckObjCConversion(SourceRange(), LHSType, E, CCK_ImplicitConversion,
                            /*Diagnose=*/true,
                            /*DiagnoseCFAudited=*/false, Opc);
      RHS = ImpCastExprToType(E, LHSType,
                              LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
    }
    return ResultTy;
  }
  if (LHSType->isObjCObjectPointerType() &&
      RHSType->isObjCObjectPointerType()) {
    if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
      diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
                                        /*isError*/false);
    if (isObjCObjectLiteral(LHS) || isObjCObjectLiteral(RHS))
      diagnoseObjCLiteralComparison(*this, Loc, LHS, RHS, Opc);

    if (LHSIsNull && !RHSIsNull)
      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
    else
      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
    return ResultTy;
  }

  if (!IsRelational && LHSType->isBlockPointerType() &&
      RHSType->isBlockCompatibleObjCPointerType(Context)) {
    LHS = ImpCastExprToType(LHS.get(), RHSType,
                            CK_BlockPointerToObjCPointerCast);
    return ResultTy;
  } else if (!IsRelational &&
             LHSType->isBlockCompatibleObjCPointerType(Context) &&
             RHSType->isBlockPointerType()) {
    RHS = ImpCastExprToType(RHS.get(), LHSType,
                            CK_BlockPointerToObjCPointerCast);
    return ResultTy;
  }
}
if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
    (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
  unsigned DiagID = 0;
  bool isError = false;
  if (LangOpts.DebuggerSupport) {
    // Under a debugger, allow the comparison of pointers to integers,
    // since users tend to want to compare addresses.
  } else if ((LHSIsNull && LHSType->isIntegerType()) ||
             (RHSIsNull && RHSType->isIntegerType())) {
    if (IsRelational) {
      isError = getLangOpts().CPlusPlus;
      DiagID =
        isError ? diag::err_typecheck_ordered_comparison_of_pointer_and_zero
                : diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
    }
  } else if (getLangOpts().CPlusPlus) {
    DiagID = diag::err_typecheck_comparison_of_pointer_integer;
    isError = true;
  } else if (IsRelational)
    DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
  else
    DiagID = diag::ext_typecheck_comparison_of_pointer_integer;

  if (DiagID) {
    Diag(Loc, DiagID)
      << LHSType << RHSType << LHS.get()->getSourceRange()
      << RHS.get()->getSourceRange();
    if (isError)
      return QualType();
  }
  
  if (LHSType->isIntegerType())
    LHS = ImpCastExprToType(LHS.get(), RHSType,
                      LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
  else
    RHS = ImpCastExprToType(RHS.get(), LHSType,
                      RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
  return ResultTy;
}

// Handle block pointers.
if (!IsRelational && RHSIsNull
    && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
  RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
  return ResultTy;
}
if (!IsRelational && LHSIsNull
    && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
  LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
  return ResultTy;
}

if (getLangOpts().OpenCLVersion >= 200) {
  if (LHSIsNull && RHSType->isQueueT()) {
    LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
    return ResultTy;
  }

  if (LHSType->isQueueT() && RHSIsNull) {
    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
    return ResultTy;
  }
}

return InvalidOperands(Loc, LHS, RHS);
10111}

10113// Return a signed ext_vector_type that is of identical size and number of
10114// elements. For floating point vectors, return an integer type of identical
10115// size and number of elements. In the non ext_vector_type case, search from
10116// the largest type to the smallest type to avoid cases where long long == long,
10117// where long gets picked over long long.
10118QualType Sema::GetSignedVectorType(QualType V) {
const VectorType *VTy = V->getAs<VectorType>();
unsigned TypeSize = Context.getTypeSize(VTy->getElementType());

if (isa<ExtVectorType>(VTy)) {
  if (TypeSize == Context.getTypeSize(Context.CharTy))
    return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
  else if (TypeSize == Context.getTypeSize(Context.ShortTy))
    return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
  else if (TypeSize == Context.getTypeSize(Context.IntTy))
    return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
  else if (TypeSize == Context.getTypeSize(Context.LongTy))
    return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
  assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&(static_cast <bool> (TypeSize == Context.getTypeSize(Context
.LongLongTy) && "Unhandled vector element size in vector compare"
) ? void (0) : __assert_fail ("TypeSize == Context.getTypeSize(Context.LongLongTy) && \"Unhandled vector element size in vector compare\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10132, __extension__ __PRETTY_FUNCTION__))
         "Unhandled vector element size in vector compare")(static_cast <bool> (TypeSize == Context.getTypeSize(Context
.LongLongTy) && "Unhandled vector element size in vector compare"
) ? void (0) : __assert_fail ("TypeSize == Context.getTypeSize(Context.LongLongTy) && \"Unhandled vector element size in vector compare\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10132, __extension__ __PRETTY_FUNCTION__));
  return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
}

if (TypeSize == Context.getTypeSize(Context.LongLongTy))
  return Context.getVectorType(Context.LongLongTy, VTy->getNumElements(),
                               VectorType::GenericVector);
else if (TypeSize == Context.getTypeSize(Context.LongTy))
  return Context.getVectorType(Context.LongTy, VTy->getNumElements(),
                               VectorType::GenericVector);
else if (TypeSize == Context.getTypeSize(Context.IntTy))
  return Context.getVectorType(Context.IntTy, VTy->getNumElements(),
                               VectorType::GenericVector);
else if (TypeSize == Context.getTypeSize(Context.ShortTy))
  return Context.getVectorType(Context.ShortTy, VTy->getNumElements(),
                               VectorType::GenericVector);
assert(TypeSize == Context.getTypeSize(Context.CharTy) &&(static_cast <bool> (TypeSize == Context.getTypeSize(Context
.CharTy) && "Unhandled vector element size in vector compare"
) ? void (0) : __assert_fail ("TypeSize == Context.getTypeSize(Context.CharTy) && \"Unhandled vector element size in vector compare\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10149, __extension__ __PRETTY_FUNCTION__))
       "Unhandled vector element size in vector compare")(static_cast <bool> (TypeSize == Context.getTypeSize(Context
.CharTy) && "Unhandled vector element size in vector compare"
) ? void (0) : __assert_fail ("TypeSize == Context.getTypeSize(Context.CharTy) && \"Unhandled vector element size in vector compare\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10149, __extension__ __PRETTY_FUNCTION__));
return Context.getVectorType(Context.CharTy, VTy->getNumElements(),
                             VectorType::GenericVector);
10152}

10154/// CheckVectorCompareOperands - vector comparisons are a clang extension that
10155/// operates on extended vector types.  Instead of producing an IntTy result,
10156/// like a scalar comparison, a vector comparison produces a vector of integer
10157/// types.
10158QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
                                        SourceLocation Loc,
                                        BinaryOperatorKind Opc) {
// Check to make sure we're operating on vectors of the same type and width,
// Allowing one side to be a scalar of element type.
QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false,
                            /*AllowBothBool*/true,
                            /*AllowBoolConversions*/getLangOpts().ZVector);
if (vType.isNull())
  return vType;

QualType LHSType = LHS.get()->getType();

// If AltiVec, the comparison results in a numeric type, i.e.
// bool for C++, int for C
if (getLangOpts().AltiVec &&
    vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
  return Context.getLogicalOperationType();

// For non-floating point types, check for self-comparisons of the form
// x == x, x != x, x < x, etc.  These always evaluate to a constant, and
// often indicate logic errors in the program.
diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);

// Check for comparisons of floating point operands using != and ==.
if (BinaryOperator::isEqualityOp(Opc) &&
    LHSType->hasFloatingRepresentation()) {
  assert(RHS.get()->getType()->hasFloatingRepresentation())(static_cast <bool> (RHS.get()->getType()->hasFloatingRepresentation
()) ? void (0) : __assert_fail ("RHS.get()->getType()->hasFloatingRepresentation()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10185, __extension__ __PRETTY_FUNCTION__));
  CheckFloatComparison(Loc, LHS.get(), RHS.get());
}

// Return a signed type for the vector.
return GetSignedVectorType(vType);
10191}

10193QualType Sema::CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
                                        SourceLocation Loc) {
// Ensure that either both operands are of the same vector type, or
// one operand is of a vector type and the other is of its element type.
QualType vType = CheckVectorOperands(LHS, RHS, Loc, false,
                                     /*AllowBothBool*/true,
                                     /*AllowBoolConversions*/false);
if (vType.isNull())
  return InvalidOperands(Loc, LHS, RHS);
if (getLangOpts().OpenCL && getLangOpts().OpenCLVersion < 120 &&
    vType->hasFloatingRepresentation())
  return InvalidOperands(Loc, LHS, RHS);
// FIXME: The check for C++ here is for GCC compatibility. GCC rejects the
//        usage of the logical operators && and || with vectors in C. This
//        check could be notionally dropped.
if (!getLangOpts().CPlusPlus &&
    !(isa<ExtVectorType>(vType->getAs<VectorType>())))
  return InvalidLogicalVectorOperands(Loc, LHS, RHS);

return GetSignedVectorType(LHS.get()->getType());
10213}

10215inline QualType Sema::CheckBitwiseOperands(ExprResult &LHS, ExprResult &RHS,
                                         SourceLocation Loc,
                                         BinaryOperatorKind Opc) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);

bool IsCompAssign =
    Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign;

if (LHS.get()->getType()->isVectorType() ||
    RHS.get()->getType()->isVectorType()) {
  if (LHS.get()->getType()->hasIntegerRepresentation() &&
      RHS.get()->getType()->hasIntegerRepresentation())
    return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
                      /*AllowBothBool*/true,
                      /*AllowBoolConversions*/getLangOpts().ZVector);
  return InvalidOperands(Loc, LHS, RHS);
}

if (Opc == BO_And)
  diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);

ExprResult LHSResult = LHS, RHSResult = RHS;
QualType compType = UsualArithmeticConversions(LHSResult, RHSResult,
                                               IsCompAssign);
if (LHSResult.isInvalid() || RHSResult.isInvalid())
  return QualType();
LHS = LHSResult.get();
RHS = RHSResult.get();

if (!compType.isNull() && compType->isIntegralOrUnscopedEnumerationType())
  return compType;
return InvalidOperands(Loc, LHS, RHS);
10247}

10249// C99 6.5.[13,14]
10250inline QualType Sema::CheckLogicalOperands(ExprResult &LHS, ExprResult &RHS,
                                         SourceLocation Loc,
                                         BinaryOperatorKind Opc) {
// Check vector operands differently.
if (LHS.get()->getType()->isVectorType() || RHS.get()->getType()->isVectorType())
  return CheckVectorLogicalOperands(LHS, RHS, Loc);

// Diagnose cases where the user write a logical and/or but probably meant a
// bitwise one.  We do this when the LHS is a non-bool integer and the RHS
// is a constant.
if (LHS.get()->getType()->isIntegerType() &&
    !LHS.get()->getType()->isBooleanType() &&
    RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
    // Don't warn in macros or template instantiations.
    !Loc.isMacroID() && !inTemplateInstantiation()) {
  // If the RHS can be constant folded, and if it constant folds to something
  // that isn't 0 or 1 (which indicate a potential logical operation that
  // happened to fold to true/false) then warn.
  // Parens on the RHS are ignored.
  llvm::APSInt Result;
  if (RHS.get()->EvaluateAsInt(Result, Context))
    if ((getLangOpts().Bool && !RHS.get()->getType()->isBooleanType() &&
         !RHS.get()->getExprLoc().isMacroID()) ||
        (Result != 0 && Result != 1)) {
      Diag(Loc, diag::warn_logical_instead_of_bitwise)
        << RHS.get()->getSourceRange()
        << (Opc == BO_LAnd ? "&&" : "||");
      // Suggest replacing the logical operator with the bitwise version
      Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
          << (Opc == BO_LAnd ? "&" : "|")
          << FixItHint::CreateReplacement(SourceRange(
                                               Loc, getLocForEndOfToken(Loc)),
                                          Opc == BO_LAnd ? "&" : "|");
      if (Opc == BO_LAnd)
        // Suggest replacing "Foo() && kNonZero" with "Foo()"
        Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
            << FixItHint::CreateRemoval(
                SourceRange(getLocForEndOfToken(LHS.get()->getLocEnd()),
                            RHS.get()->getLocEnd()));
    }
}

if (!Context.getLangOpts().CPlusPlus) {
  // OpenCL v1.1 s6.3.g: The logical operators and (&&), or (||) do
  // not operate on the built-in scalar and vector float types.
  if (Context.getLangOpts().OpenCL &&
      Context.getLangOpts().OpenCLVersion < 120) {
    if (LHS.get()->getType()->isFloatingType() ||
        RHS.get()->getType()->isFloatingType())
      return InvalidOperands(Loc, LHS, RHS);
  }

  LHS = UsualUnaryConversions(LHS.get());
  if (LHS.isInvalid())
    return QualType();

  RHS = UsualUnaryConversions(RHS.get());
  if (RHS.isInvalid())
    return QualType();

  if (!LHS.get()->getType()->isScalarType() ||
      !RHS.get()->getType()->isScalarType())
    return InvalidOperands(Loc, LHS, RHS);

  return Context.IntTy;
}

// The following is safe because we only use this method for
// non-overloadable operands.

// C++ [expr.log.and]p1
// C++ [expr.log.or]p1
// The operands are both contextually converted to type bool.
ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
if (LHSRes.isInvalid())
  return InvalidOperands(Loc, LHS, RHS);
LHS = LHSRes;

ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
if (RHSRes.isInvalid())
  return InvalidOperands(Loc, LHS, RHS);
RHS = RHSRes;

// C++ [expr.log.and]p2
// C++ [expr.log.or]p2
// The result is a bool.
return Context.BoolTy;
10337}

10339static bool IsReadonlyMessage(Expr *E, Sema &S) {
const MemberExpr *ME = dyn_cast<MemberExpr>(E);
if (!ME) return false;
if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
ObjCMessageExpr *Base = dyn_cast<ObjCMessageExpr>(
    ME->getBase()->IgnoreImplicit()->IgnoreParenImpCasts());
if (!Base) return false;
return Base->getMethodDecl() != nullptr;
10347}

10349/// Is the given expression (which must be 'const') a reference to a
10350/// variable which was originally non-const, but which has become
10351/// 'const' due to being captured within a block?
10352enum NonConstCaptureKind { NCCK_None, NCCK_Block, NCCK_Lambda };
10353static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E) {
assert(E->isLValue() && E->getType().isConstQualified())(static_cast <bool> (E->isLValue() && E->
getType().isConstQualified()) ? void (0) : __assert_fail ("E->isLValue() && E->getType().isConstQualified()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10354, __extension__ __PRETTY_FUNCTION__));
E = E->IgnoreParens();

// Must be a reference to a declaration from an enclosing scope.
DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
if (!DRE) return NCCK_None;
if (!DRE->refersToEnclosingVariableOrCapture()) return NCCK_None;

// The declaration must be a variable which is not declared 'const'.
VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
if (!var) return NCCK_None;
if (var->getType().isConstQualified()) return NCCK_None;
assert(var->hasLocalStorage() && "capture added 'const' to non-local?")(static_cast <bool> (var->hasLocalStorage() &&
 "capture added 'const' to non-local?") ? void (0) : __assert_fail
 ("var->hasLocalStorage() && \"capture added 'const' to non-local?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10366, __extension__ __PRETTY_FUNCTION__));

// Decide whether the first capture was for a block or a lambda.
DeclContext *DC = S.CurContext, *Prev = nullptr;
// Decide whether the first capture was for a block or a lambda.
while (DC) {
  // For init-capture, it is possible that the variable belongs to the
  // template pattern of the current context.
  if (auto *FD = dyn_cast<FunctionDecl>(DC))
    if (var->isInitCapture() &&
        FD->getTemplateInstantiationPattern() == var->getDeclContext())
      break;
  if (DC == var->getDeclContext())
    break;
  Prev = DC;
  DC = DC->getParent();
}
// Unless we have an init-capture, we've gone one step too far.
if (!var->isInitCapture())
  DC = Prev;
return (isa<BlockDecl>(DC) ? NCCK_Block : NCCK_Lambda);
10387}

10389static bool IsTypeModifiable(QualType Ty, bool IsDereference) {
Ty = Ty.getNonReferenceType();
if (IsDereference && Ty->isPointerType())
  Ty = Ty->getPointeeType();
return !Ty.isConstQualified();
10394}

10396// Update err_typecheck_assign_const and note_typecheck_assign_const
10397// when this enum is changed.
10398enum {
ConstFunction,
ConstVariable,
ConstMember,
ConstMethod,
NestedConstMember,
ConstUnknown,  // Keep as last element
10405};

10407/// Emit the "read-only variable not assignable" error and print notes to give
10408/// more information about why the variable is not assignable, such as pointing
10409/// to the declaration of a const variable, showing that a method is const, or
10410/// that the function is returning a const reference.
10411static void DiagnoseConstAssignment(Sema &S, const Expr *E,
                                  SourceLocation Loc) {
SourceRange ExprRange = E->getSourceRange();

// Only emit one error on the first const found.  All other consts will emit
// a note to the error.
bool DiagnosticEmitted = false;

// Track if the current expression is the result of a dereference, and if the
// next checked expression is the result of a dereference.
bool IsDereference = false;
bool NextIsDereference = false;

// Loop to process MemberExpr chains.
while (true) {
  IsDereference = NextIsDereference;

  E = E->IgnoreImplicit()->IgnoreParenImpCasts();
  if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
    NextIsDereference = ME->isArrow();
    const ValueDecl *VD = ME->getMemberDecl();
    if (const FieldDecl *Field = dyn_cast<FieldDecl>(VD)) {
      // Mutable fields can be modified even if the class is const.
      if (Field->isMutable()) {
        assert(DiagnosticEmitted && "Expected diagnostic not emitted.")(static_cast <bool> (DiagnosticEmitted && "Expected diagnostic not emitted."
) ? void (0) : __assert_fail ("DiagnosticEmitted && \"Expected diagnostic not emitted.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10435, __extension__ __PRETTY_FUNCTION__));
        break;
      }

      if (!IsTypeModifiable(Field->getType(), IsDereference)) {
        if (!DiagnosticEmitted) {
          S.Diag(Loc, diag::err_typecheck_assign_const)
              << ExprRange << ConstMember << false /*static*/ << Field
              << Field->getType();
          DiagnosticEmitted = true;
        }
        S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
            << ConstMember << false /*static*/ << Field << Field->getType()
            << Field->getSourceRange();
      }
      E = ME->getBase();
      continue;
    } else if (const VarDecl *VDecl = dyn_cast<VarDecl>(VD)) {
      if (VDecl->getType().isConstQualified()) {
        if (!DiagnosticEmitted) {
          S.Diag(Loc, diag::err_typecheck_assign_const)
              << ExprRange << ConstMember << true /*static*/ << VDecl
              << VDecl->getType();
          DiagnosticEmitted = true;
        }
        S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
            << ConstMember << true /*static*/ << VDecl << VDecl->getType()
            << VDecl->getSourceRange();
      }
      // Static fields do not inherit constness from parents.
      break;
    }
    break; // End MemberExpr
  } else if (const ArraySubscriptExpr *ASE =
                 dyn_cast<ArraySubscriptExpr>(E)) {
    E = ASE->getBase()->IgnoreParenImpCasts();
    continue;
  } else if (const ExtVectorElementExpr *EVE =
                 dyn_cast<ExtVectorElementExpr>(E)) {
    E = EVE->getBase()->IgnoreParenImpCasts();
    continue;
  }
  break;
}

if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
  // Function calls
  const FunctionDecl *FD = CE->getDirectCallee();
  if (FD && !IsTypeModifiable(FD->getReturnType(), IsDereference)) {
    if (!DiagnosticEmitted) {
      S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
                                                    << ConstFunction << FD;
      DiagnosticEmitted = true;
    }
    S.Diag(FD->getReturnTypeSourceRange().getBegin(),
           diag::note_typecheck_assign_const)
        << ConstFunction << FD << FD->getReturnType()
        << FD->getReturnTypeSourceRange();
  }
} else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  // Point to variable declaration.
  if (const ValueDecl *VD = DRE->getDecl()) {
    if (!IsTypeModifiable(VD->getType(), IsDereference)) {
      if (!DiagnosticEmitted) {
        S.Diag(Loc, diag::err_typecheck_assign_const)
            << ExprRange << ConstVariable << VD << VD->getType();
        DiagnosticEmitted = true;
      }
      S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
          << ConstVariable << VD << VD->getType() << VD->getSourceRange();
    }
  }
} else if (isa<CXXThisExpr>(E)) {
  if (const DeclContext *DC = S.getFunctionLevelDeclContext()) {
    if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
      if (MD->isConst()) {
        if (!DiagnosticEmitted) {
          S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
                                                        << ConstMethod << MD;
          DiagnosticEmitted = true;
        }
        S.Diag(MD->getLocation(), diag::note_typecheck_assign_const)
            << ConstMethod << MD << MD->getSourceRange();
      }
    }
  }
}

if (DiagnosticEmitted)
  return;

// Can't determine a more specific message, so display the generic error.
S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange << ConstUnknown;
10528}

10530enum OriginalExprKind {
OEK_Variable,
OEK_Member,
OEK_LValue
10534};

10536static void DiagnoseRecursiveConstFields(Sema &S, const ValueDecl *VD,
                                       const RecordType *Ty,
                                       SourceLocation Loc, SourceRange Range,
                                       OriginalExprKind OEK,
                                       bool &DiagnosticEmitted,
                                       bool IsNested = false) {
// We walk the record hierarchy breadth-first to ensure that we print
// diagnostics in field nesting order.
// First, check every field for constness.
for (const FieldDecl *Field : Ty->getDecl()->fields()) {
  if (Field->getType().isConstQualified()) {
    if (!DiagnosticEmitted) {
      S.Diag(Loc, diag::err_typecheck_assign_const)
          << Range << NestedConstMember << OEK << VD
          << IsNested << Field;
      DiagnosticEmitted = true;
    }
    S.Diag(Field->getLocation(), diag::note_typecheck_assign_const)
        << NestedConstMember << IsNested << Field
        << Field->getType() << Field->getSourceRange();
  }
}
// Then, recurse.
for (const FieldDecl *Field : Ty->getDecl()->fields()) {
  QualType FTy = Field->getType();
  if (const RecordType *FieldRecTy = FTy->getAs<RecordType>())
    DiagnoseRecursiveConstFields(S, VD, FieldRecTy, Loc, Range,
                                 OEK, DiagnosticEmitted, true);
}
10565}

10567/// Emit an error for the case where a record we are trying to assign to has a
10568/// const-qualified field somewhere in its hierarchy.
10569static void DiagnoseRecursiveConstFields(Sema &S, const Expr *E,
                                       SourceLocation Loc) {
QualType Ty = E->getType();
assert(Ty->isRecordType() && "lvalue was not record?")(static_cast <bool> (Ty->isRecordType() && "lvalue was not record?"
) ? void (0) : __assert_fail ("Ty->isRecordType() && \"lvalue was not record?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10572, __extension__ __PRETTY_FUNCTION__));
SourceRange Range = E->getSourceRange();
const RecordType *RTy = Ty.getCanonicalType()->getAs<RecordType>();
bool DiagEmitted = false;

if (const MemberExpr *ME = dyn_cast<MemberExpr>(E))
  DiagnoseRecursiveConstFields(S, ME->getMemberDecl(), RTy, Loc,
          Range, OEK_Member, DiagEmitted);
else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
  DiagnoseRecursiveConstFields(S, DRE->getDecl(), RTy, Loc,
          Range, OEK_Variable, DiagEmitted);
else
  DiagnoseRecursiveConstFields(S, nullptr, RTy, Loc,
          Range, OEK_LValue, DiagEmitted);
if (!DiagEmitted)
  DiagnoseConstAssignment(S, E, Loc);
10588}

10590/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue.  If not,
10591/// emit an error and return true.  If so, return false.
10592static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
assert(!E->hasPlaceholderType(BuiltinType::PseudoObject))(static_cast <bool> (!E->hasPlaceholderType(BuiltinType
::PseudoObject)) ? void (0) : __assert_fail ("!E->hasPlaceholderType(BuiltinType::PseudoObject)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10593, __extension__ __PRETTY_FUNCTION__));

S.CheckShadowingDeclModification(E, Loc);

SourceLocation OrigLoc = Loc;
Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
                                                            &Loc);
if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
  IsLV = Expr::MLV_InvalidMessageExpression;
if (IsLV == Expr::MLV_Valid)
  return false;

unsigned DiagID = 0;
bool NeedType = false;
switch (IsLV) { // C99 6.5.16p2
case Expr::MLV_ConstQualified:
  // Use a specialized diagnostic when we're assigning to an object
  // from an enclosing function or block.
  if (NonConstCaptureKind NCCK = isReferenceToNonConstCapture(S, E)) {
    if (NCCK == NCCK_Block)
      DiagID = diag::err_block_decl_ref_not_modifiable_lvalue;
    else
      DiagID = diag::err_lambda_decl_ref_not_modifiable_lvalue;
    break;
  }

  // In ARC, use some specialized diagnostics for occasions where we
  // infer 'const'.  These are always pseudo-strong variables.
  if (S.getLangOpts().ObjCAutoRefCount) {
    DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
    if (declRef && isa<VarDecl>(declRef->getDecl())) {
      VarDecl *var = cast<VarDecl>(declRef->getDecl());

      // Use the normal diagnostic if it's pseudo-__strong but the
      // user actually wrote 'const'.
      if (var->isARCPseudoStrong() &&
          (!var->getTypeSourceInfo() ||
           !var->getTypeSourceInfo()->getType().isConstQualified())) {
        // There are two pseudo-strong cases:
        //  - self
        ObjCMethodDecl *method = S.getCurMethodDecl();
        if (method && var == method->getSelfDecl())
          DiagID = method->isClassMethod()
            ? diag::err_typecheck_arc_assign_self_class_method
            : diag::err_typecheck_arc_assign_self;

        //  - fast enumeration variables
        else
          DiagID = diag::err_typecheck_arr_assign_enumeration;

        SourceRange Assign;
        if (Loc != OrigLoc)
          Assign = SourceRange(OrigLoc, OrigLoc);
        S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
        // We need to preserve the AST regardless, so migration tool
        // can do its job.
        return false;
      }
    }
  }

  // If none of the special cases above are triggered, then this is a
  // simple const assignment.
  if (DiagID == 0) {
    DiagnoseConstAssignment(S, E, Loc);
    return true;
  }

  break;
case Expr::MLV_ConstAddrSpace:
  DiagnoseConstAssignment(S, E, Loc);
  return true;
case Expr::MLV_ConstQualifiedField:
  DiagnoseRecursiveConstFields(S, E, Loc);
  return true;
case Expr::MLV_ArrayType:
case Expr::MLV_ArrayTemporary:
  DiagID = diag::err_typecheck_array_not_modifiable_lvalue;
  NeedType = true;
  break;
case Expr::MLV_NotObjectType:
  DiagID = diag::err_typecheck_non_object_not_modifiable_lvalue;
  NeedType = true;
  break;
case Expr::MLV_LValueCast:
  DiagID = diag::err_typecheck_lvalue_casts_not_supported;
  break;
case Expr::MLV_Valid:
  llvm_unreachable("did not take early return for MLV_Valid")::llvm::llvm_unreachable_internal("did not take early return for MLV_Valid"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10681);
case Expr::MLV_InvalidExpression:
case Expr::MLV_MemberFunction:
case Expr::MLV_ClassTemporary:
  DiagID = diag::err_typecheck_expression_not_modifiable_lvalue;
  break;
case Expr::MLV_IncompleteType:
case Expr::MLV_IncompleteVoidType:
  return S.RequireCompleteType(Loc, E->getType(),
           diag::err_typecheck_incomplete_type_not_modifiable_lvalue, E);
case Expr::MLV_DuplicateVectorComponents:
  DiagID = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
  break;
case Expr::MLV_NoSetterProperty:
  llvm_unreachable("readonly properties should be processed differently")::llvm::llvm_unreachable_internal("readonly properties should be processed differently"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10695);
case Expr::MLV_InvalidMessageExpression:
  DiagID = diag::err_readonly_message_assignment;
  break;
case Expr::MLV_SubObjCPropertySetting:
  DiagID = diag::err_no_subobject_property_setting;
  break;
}

SourceRange Assign;
if (Loc != OrigLoc)
  Assign = SourceRange(OrigLoc, OrigLoc);
if (NeedType)
  S.Diag(Loc, DiagID) << E->getType() << E->getSourceRange() << Assign;
else
  S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
return true;
10712}

10714static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr,
                                       SourceLocation Loc,
                                       Sema &Sema) {
if (Sema.inTemplateInstantiation())
  return;
if (Sema.isUnevaluatedContext())
  return;
if (Loc.isInvalid() || Loc.isMacroID())
  return;
if (LHSExpr->getExprLoc().isMacroID() || RHSExpr->getExprLoc().isMacroID())
  return;

// C / C++ fields
MemberExpr *ML = dyn_cast<MemberExpr>(LHSExpr);
MemberExpr *MR = dyn_cast<MemberExpr>(RHSExpr);
if (ML && MR) {
  if (!(isa<CXXThisExpr>(ML->getBase()) && isa<CXXThisExpr>(MR->getBase())))
    return;
  const ValueDecl *LHSDecl =
      cast<ValueDecl>(ML->getMemberDecl()->getCanonicalDecl());
  const ValueDecl *RHSDecl =
      cast<ValueDecl>(MR->getMemberDecl()->getCanonicalDecl());
  if (LHSDecl != RHSDecl)
    return;
  if (LHSDecl->getType().isVolatileQualified())
    return;
  if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
    if (RefTy->getPointeeType().isVolatileQualified())
      return;

  Sema.Diag(Loc, diag::warn_identity_field_assign) << 0;
}

// Objective-C instance variables
ObjCIvarRefExpr *OL = dyn_cast<ObjCIvarRefExpr>(LHSExpr);
ObjCIvarRefExpr *OR = dyn_cast<ObjCIvarRefExpr>(RHSExpr);
if (OL && OR && OL->getDecl() == OR->getDecl()) {
  DeclRefExpr *RL = dyn_cast<DeclRefExpr>(OL->getBase()->IgnoreImpCasts());
  DeclRefExpr *RR = dyn_cast<DeclRefExpr>(OR->getBase()->IgnoreImpCasts());
  if (RL && RR && RL->getDecl() == RR->getDecl())
    Sema.Diag(Loc, diag::warn_identity_field_assign) << 1;
}
10756}

10758// C99 6.5.16.1
10759QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
                                     SourceLocation Loc,
                                     QualType CompoundType) {
assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject))(static_cast <bool> (!LHSExpr->hasPlaceholderType(BuiltinType
::PseudoObject)) ? void (0) : __assert_fail ("!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10762, __extension__ __PRETTY_FUNCTION__));

// Verify that LHS is a modifiable lvalue, and emit error if not.
if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
  return QualType();

QualType LHSType = LHSExpr->getType();
QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
                                           CompoundType;
// OpenCL v1.2 s6.1.1.1 p2:
// The half data type can only be used to declare a pointer to a buffer that
// contains half values
if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
  LHSType->isHalfType()) {
  Diag(Loc, diag::err_opencl_half_load_store) << 1
      << LHSType.getUnqualifiedType();
  return QualType();
}
  
AssignConvertType ConvTy;
if (CompoundType.isNull()) {
  Expr *RHSCheck = RHS.get();

  CheckIdentityFieldAssignment(LHSExpr, RHSCheck, Loc, *this);

  QualType LHSTy(LHSType);
  ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
  if (RHS.isInvalid())
    return QualType();
  // Special case of NSObject attributes on c-style pointer types.
  if (ConvTy == IncompatiblePointer &&
      ((Context.isObjCNSObjectType(LHSType) &&
        RHSType->isObjCObjectPointerType()) ||
       (Context.isObjCNSObjectType(RHSType) &&
        LHSType->isObjCObjectPointerType())))
    ConvTy = Compatible;

  if (ConvTy == Compatible &&
      LHSType->isObjCObjectType())
      Diag(Loc, diag::err_objc_object_assignment)
        << LHSType;

  // If the RHS is a unary plus or minus, check to see if they = and + are
  // right next to each other.  If so, the user may have typo'd "x =+ 4"
  // instead of "x += 4".
  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
    RHSCheck = ICE->getSubExpr();
  if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
    if ((UO->getOpcode() == UO_Plus ||
         UO->getOpcode() == UO_Minus) &&
        Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
        // Only if the two operators are exactly adjacent.
        Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
        // And there is a space or other character before the subexpr of the
        // unary +/-.  We don't want to warn on "x=-1".
        Loc.getLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
        UO->getSubExpr()->getLocStart().isFileID()) {
      Diag(Loc, diag::warn_not_compound_assign)
        << (UO->getOpcode() == UO_Plus ? "+" : "-")
        << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
    }
  }

  if (ConvTy == Compatible) {
    if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong) {
      // Warn about retain cycles where a block captures the LHS, but
      // not if the LHS is a simple variable into which the block is
      // being stored...unless that variable can be captured by reference!
      const Expr *InnerLHS = LHSExpr->IgnoreParenCasts();
      const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InnerLHS);
      if (!DRE || DRE->getDecl()->hasAttr<BlocksAttr>())
        checkRetainCycles(LHSExpr, RHS.get());
    }

    if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong ||
        LHSType.isNonWeakInMRRWithObjCWeak(Context)) {
      // It is safe to assign a weak reference into a strong variable.
      // Although this code can still have problems:
      //   id x = self.weakProp;
      //   id y = self.weakProp;
      // we do not warn to warn spuriously when 'x' and 'y' are on separate
      // paths through the function. This should be revisited if
      // -Wrepeated-use-of-weak is made flow-sensitive.
      // For ObjCWeak only, we do not warn if the assign is to a non-weak
      // variable, which will be valid for the current autorelease scope.
      if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
                           RHS.get()->getLocStart()))
        getCurFunction()->markSafeWeakUse(RHS.get());

    } else if (getLangOpts().ObjCAutoRefCount || getLangOpts().ObjCWeak) {
      checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
    }
  }
} else {
  // Compound assignment "x += y"
  ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
}

if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
                             RHS.get(), AA_Assigning))
  return QualType();

CheckForNullPointerDereference(*this, LHSExpr);

// C99 6.5.16p3: The type of an assignment expression is the type of the
// left operand unless the left operand has qualified type, in which case
// it is the unqualified version of the type of the left operand.
// C99 6.5.16.1p2: In simple assignment, the value of the right operand
// is converted to the type of the assignment expression (above).
// C++ 5.17p1: the type of the assignment expression is that of its left
// operand.
return (getLangOpts().CPlusPlus
        ? LHSType : LHSType.getUnqualifiedType());
10875}

10877// Only ignore explicit casts to void.
10878static bool IgnoreCommaOperand(const Expr *E) {
E = E->IgnoreParens();

if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
  if (CE->getCastKind() == CK_ToVoid) {
    return true;
  }
}

return false;
10888}

10890// Look for instances where it is likely the comma operator is confused with
10891// another operator.  There is a whitelist of acceptable expressions for the
10892// left hand side of the comma operator, otherwise emit a warning.
10893void Sema::DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc) {
// No warnings in macros
if (Loc.isMacroID())
  return;

// Don't warn in template instantiations.
if (inTemplateInstantiation())
  return;

// Scope isn't fine-grained enough to whitelist the specific cases, so
// instead, skip more than needed, then call back into here with the
// CommaVisitor in SemaStmt.cpp.
// The whitelisted locations are the initialization and increment portions
// of a for loop.  The additional checks are on the condition of
// if statements, do/while loops, and for loops.
const unsigned ForIncrementFlags =
    Scope::ControlScope | Scope::ContinueScope | Scope::BreakScope;
const unsigned ForInitFlags = Scope::ControlScope | Scope::DeclScope;
const unsigned ScopeFlags = getCurScope()->getFlags();
if ((ScopeFlags & ForIncrementFlags) == ForIncrementFlags ||
    (ScopeFlags & ForInitFlags) == ForInitFlags)
  return;

// If there are multiple comma operators used together, get the RHS of the
// of the comma operator as the LHS.
while (const BinaryOperator *BO = dyn_cast<BinaryOperator>(LHS)) {
  if (BO->getOpcode() != BO_Comma)
    break;
  LHS = BO->getRHS();
}

// Only allow some expressions on LHS to not warn.
if (IgnoreCommaOperand(LHS))
  return;

Diag(Loc, diag::warn_comma_operator);
Diag(LHS->getLocStart(), diag::note_cast_to_void)
    << LHS->getSourceRange()
    << FixItHint::CreateInsertion(LHS->getLocStart(),
                                  LangOpts.CPlusPlus ? "static_cast<void>("
                                                     : "(void)(")
    << FixItHint::CreateInsertion(PP.getLocForEndOfToken(LHS->getLocEnd()),
                                  ")");
10936}

10938// C99 6.5.17
10939static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
                                 SourceLocation Loc) {
LHS = S.CheckPlaceholderExpr(LHS.get());
RHS = S.CheckPlaceholderExpr(RHS.get());
if (LHS.isInvalid() || RHS.isInvalid())
  return QualType();

// C's comma performs lvalue conversion (C99 6.3.2.1) on both its
// operands, but not unary promotions.
// C++'s comma does not do any conversions at all (C++ [expr.comma]p1).

// So we treat the LHS as a ignored value, and in C++ we allow the
// containing site to determine what should be done with the RHS.
LHS = S.IgnoredValueConversions(LHS.get());
if (LHS.isInvalid())
  return QualType();

S.DiagnoseUnusedExprResult(LHS.get());

if (!S.getLangOpts().CPlusPlus) {
  RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
  if (RHS.isInvalid())
    return QualType();
  if (!RHS.get()->getType()->isVoidType())
    S.RequireCompleteType(Loc, RHS.get()->getType(),
                          diag::err_incomplete_type);
}

if (!S.getDiagnostics().isIgnored(diag::warn_comma_operator, Loc))
  S.DiagnoseCommaOperator(LHS.get(), Loc);

return RHS.get()->getType();
10971}

10973/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
10974/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
10975static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
                                             ExprValueKind &VK,
                                             ExprObjectKind &OK,
                                             SourceLocation OpLoc,
                                             bool IsInc, bool IsPrefix) {
if (Op->isTypeDependent())
  return S.Context.DependentTy;

QualType ResType = Op->getType();
// Atomic types can be used for increment / decrement where the non-atomic
// versions can, so ignore the _Atomic() specifier for the purpose of
// checking.
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
  ResType = ResAtomicType->getValueType();

assert(!ResType.isNull() && "no type for increment/decrement expression")(static_cast <bool> (!ResType.isNull() && "no type for increment/decrement expression"
) ? void (0) : __assert_fail ("!ResType.isNull() && \"no type for increment/decrement expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 10990, __extension__ __PRETTY_FUNCTION__));

if (S.getLangOpts().CPlusPlus && ResType->isBooleanType()) {
  // Decrement of bool is not allowed.
  if (!IsInc) {
    S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
    return QualType();
  }
  // Increment of bool sets it to true, but is deprecated.
  S.Diag(OpLoc, S.getLangOpts().CPlusPlus17 ? diag::ext_increment_bool
                                            : diag::warn_increment_bool)
    << Op->getSourceRange();
} else if (S.getLangOpts().CPlusPlus && ResType->isEnumeralType()) {
  // Error on enum increments and decrements in C++ mode
  S.Diag(OpLoc, diag::err_increment_decrement_enum) << IsInc << ResType;
  return QualType();
} else if (ResType->isRealType()) {
  // OK!
} else if (ResType->isPointerType()) {
  // C99 6.5.2.4p2, 6.5.6p2
  if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
    return QualType();
} else if (ResType->isObjCObjectPointerType()) {
  // On modern runtimes, ObjC pointer arithmetic is forbidden.
  // Otherwise, we just need a complete type.
  if (checkArithmeticIncompletePointerType(S, OpLoc, Op) ||
      checkArithmeticOnObjCPointer(S, OpLoc, Op))
    return QualType();    
} else if (ResType->isAnyComplexType()) {
  // C99 does not support ++/-- on complex types, we allow as an extension.
  S.Diag(OpLoc, diag::ext_integer_increment_complex)
    << ResType << Op->getSourceRange();
} else if (ResType->isPlaceholderType()) {
  ExprResult PR = S.CheckPlaceholderExpr(Op);
  if (PR.isInvalid()) return QualType();
  return CheckIncrementDecrementOperand(S, PR.get(), VK, OK, OpLoc,
                                        IsInc, IsPrefix);
} else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
  // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
} else if (S.getLangOpts().ZVector && ResType->isVectorType() &&
           (ResType->getAs<VectorType>()->getVectorKind() !=
            VectorType::AltiVecBool)) {
  // The z vector extensions allow ++ and -- for non-bool vectors.
} else if(S.getLangOpts().OpenCL && ResType->isVectorType() &&
          ResType->getAs<VectorType>()->getElementType()->isIntegerType()) {
  // OpenCL V1.2 6.3 says dec/inc ops operate on integer vector types.
} else {
  S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
    << ResType << int(IsInc) << Op->getSourceRange();
  return QualType();
}
// At this point, we know we have a real, complex or pointer type.
// Now make sure the operand is a modifiable lvalue.
if (CheckForModifiableLvalue(Op, OpLoc, S))
  return QualType();
// In C++, a prefix increment is the same type as the operand. Otherwise
// (in C or with postfix), the increment is the unqualified type of the
// operand.
if (IsPrefix && S.getLangOpts().CPlusPlus) {
  VK = VK_LValue;
  OK = Op->getObjectKind();
  return ResType;
} else {
  VK = VK_RValue;
  return ResType.getUnqualifiedType();
}
11056}


11059/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
11060/// This routine allows us to typecheck complex/recursive expressions
11061/// where the declaration is needed for type checking. We only need to
11062/// handle cases when the expression references a function designator
11063/// or is an lvalue. Here are some examples:
11064///  - &(x) => x
11065///  - &*****f => f for f a function designator.
11066///  - &s.xx => s
11067///  - &s.zz[1].yy -> s, if zz is an array
11068///  - *(x + 1) -> x, if x is an array
11069///  - &"123"[2] -> 0
11070///  - & __real__ x -> x
11071static ValueDecl *getPrimaryDecl(Expr *E) {
switch (E->getStmtClass()) {
case Stmt::DeclRefExprClass:
  return cast<DeclRefExpr>(E)->getDecl();
case Stmt::MemberExprClass:
  // If this is an arrow operator, the address is an offset from
  // the base's value, so the object the base refers to is
  // irrelevant.
  if (cast<MemberExpr>(E)->isArrow())
    return nullptr;
  // Otherwise, the expression refers to a part of the base
  return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
case Stmt::ArraySubscriptExprClass: {
  // FIXME: This code shouldn't be necessary!  We should catch the implicit
  // promotion of register arrays earlier.
  Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
  if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
    if (ICE->getSubExpr()->getType()->isArrayType())
      return getPrimaryDecl(ICE->getSubExpr());
  }
  return nullptr;
}
case Stmt::UnaryOperatorClass: {
  UnaryOperator *UO = cast<UnaryOperator>(E);

  switch(UO->getOpcode()) {
  case UO_Real:
  case UO_Imag:
  case UO_Extension:
    return getPrimaryDecl(UO->getSubExpr());
  default:
    return nullptr;
  }
}
case Stmt::ParenExprClass:
  return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
case Stmt::ImplicitCastExprClass:
  // If the result of an implicit cast is an l-value, we care about
  // the sub-expression; otherwise, the result here doesn't matter.
  return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
default:
  return nullptr;
}
11114}

11116namespace {
enum {
  AO_Bit_Field = 0,
  AO_Vector_Element = 1,
  AO_Property_Expansion = 2,
  AO_Register_Variable = 3,
  AO_No_Error = 4
};
11124}
11125/// \brief Diagnose invalid operand for address of operations.
11126///
11127/// \param Type The type of operand which cannot have its address taken.
11128static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
                                       Expr *E, unsigned Type) {
S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
11131}

11133/// CheckAddressOfOperand - The operand of & must be either a function
11134/// designator or an lvalue designating an object. If it is an lvalue, the
11135/// object cannot be declared with storage class register or be a bit field.
11136/// Note: The usual conversions are *not* applied to the operand of the &
11137/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
11138/// In C++, the operand might be an overloaded function name, in which case
11139/// we allow the '&' but retain the overloaded-function type.
11140QualType Sema::CheckAddressOfOperand(ExprResult &OrigOp, SourceLocation OpLoc) {
if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
  if (PTy->getKind() == BuiltinType::Overload) {
    Expr *E = OrigOp.get()->IgnoreParens();
    if (!isa<OverloadExpr>(E)) {
      assert(cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf)(static_cast <bool> (cast<UnaryOperator>(E)->getOpcode
() == UO_AddrOf) ? void (0) : __assert_fail ("cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11145, __extension__ __PRETTY_FUNCTION__));
      Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof_addrof_function)
        << OrigOp.get()->getSourceRange();
      return QualType();
    }

    OverloadExpr *Ovl = cast<OverloadExpr>(E);
    if (isa<UnresolvedMemberExpr>(Ovl))
      if (!ResolveSingleFunctionTemplateSpecialization(Ovl)) {
        Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
          << OrigOp.get()->getSourceRange();
        return QualType();
      }

    return Context.OverloadTy;
  }

  if (PTy->getKind() == BuiltinType::UnknownAny)
    return Context.UnknownAnyTy;

  if (PTy->getKind() == BuiltinType::BoundMember) {
    Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
      << OrigOp.get()->getSourceRange();
    return QualType();
  }

  OrigOp = CheckPlaceholderExpr(OrigOp.get());
  if (OrigOp.isInvalid()) return QualType();
}

if (OrigOp.get()->isTypeDependent())
  return Context.DependentTy;

assert(!OrigOp.get()->getType()->isPlaceholderType())(static_cast <bool> (!OrigOp.get()->getType()->isPlaceholderType
()) ? void (0) : __assert_fail ("!OrigOp.get()->getType()->isPlaceholderType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11178, __extension__ __PRETTY_FUNCTION__));

// Make sure to ignore parentheses in subsequent checks
Expr *op = OrigOp.get()->IgnoreParens();

// In OpenCL captures for blocks called as lambda functions
// are located in the private address space. Blocks used in
// enqueue_kernel can be located in a different address space
// depending on a vendor implementation. Thus preventing
// taking an address of the capture to avoid invalid AS casts.
if (LangOpts.OpenCL) {
  auto* VarRef = dyn_cast<DeclRefExpr>(op);
  if (VarRef && VarRef->refersToEnclosingVariableOrCapture()) {
    Diag(op->getExprLoc(), diag::err_opencl_taking_address_capture);
    return QualType();
  }
}

if (getLangOpts().C99) {
  // Implement C99-only parts of addressof rules.
  if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
    if (uOp->getOpcode() == UO_Deref)
      // Per C99 6.5.3.2, the address of a deref always returns a valid result
      // (assuming the deref expression is valid).
      return uOp->getSubExpr()->getType();
  }
  // Technically, there should be a check for array subscript
  // expressions here, but the result of one is always an lvalue anyway.
}
ValueDecl *dcl = getPrimaryDecl(op);

if (auto *FD = dyn_cast_or_null<FunctionDecl>(dcl))
  if (!checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
                                         op->getLocStart()))
    return QualType();

Expr::LValueClassification lval = op->ClassifyLValue(Context);
unsigned AddressOfError = AO_No_Error;

if (lval == Expr::LV_ClassTemporary || lval == Expr::LV_ArrayTemporary) { 
  bool sfinae = (bool)isSFINAEContext();
  Diag(OpLoc, isSFINAEContext() ? diag::err_typecheck_addrof_temporary
                                : diag::ext_typecheck_addrof_temporary)
    << op->getType() << op->getSourceRange();
  if (sfinae)
    return QualType();
  // Materialize the temporary as an lvalue so that we can take its address.
  OrigOp = op =
      CreateMaterializeTemporaryExpr(op->getType(), OrigOp.get(), true);
} else if (isa<ObjCSelectorExpr>(op)) {
  return Context.getPointerType(op->getType());
} else if (lval == Expr::LV_MemberFunction) {
  // If it's an instance method, make a member pointer.
  // The expression must have exactly the form &A::foo.

  // If the underlying expression isn't a decl ref, give up.
  if (!isa<DeclRefExpr>(op)) {
    Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
      << OrigOp.get()->getSourceRange();
    return QualType();
  }
  DeclRefExpr *DRE = cast<DeclRefExpr>(op);
  CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());

  // The id-expression was parenthesized.
  if (OrigOp.get() != DRE) {
    Diag(OpLoc, diag::err_parens_pointer_member_function)
      << OrigOp.get()->getSourceRange();

  // The method was named without a qualifier.
  } else if (!DRE->getQualifier()) {
    if (MD->getParent()->getName().empty())
      Diag(OpLoc, diag::err_unqualified_pointer_member_function)
        << op->getSourceRange();
    else {
      SmallString<32> Str;
      StringRef Qual = (MD->getParent()->getName() + "::").toStringRef(Str);
      Diag(OpLoc, diag::err_unqualified_pointer_member_function)
        << op->getSourceRange()
        << FixItHint::CreateInsertion(op->getSourceRange().getBegin(), Qual);
    }
  }

  // Taking the address of a dtor is illegal per C++ [class.dtor]p2.
  if (isa<CXXDestructorDecl>(MD))
    Diag(OpLoc, diag::err_typecheck_addrof_dtor) << op->getSourceRange();

  QualType MPTy = Context.getMemberPointerType(
      op->getType(), Context.getTypeDeclType(MD->getParent()).getTypePtr());
  // Under the MS ABI, lock down the inheritance model now.
  if (Context.getTargetInfo().getCXXABI().isMicrosoft())
    (void)isCompleteType(OpLoc, MPTy);
  return MPTy;
} else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
  // C99 6.5.3.2p1
  // The operand must be either an l-value or a function designator
  if (!op->getType()->isFunctionType()) {
    // Use a special diagnostic for loads from property references.
    if (isa<PseudoObjectExpr>(op)) {
      AddressOfError = AO_Property_Expansion;
    } else {
      Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
        << op->getType() << op->getSourceRange();
      return QualType();
    }
  }
} else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
  // The operand cannot be a bit-field
  AddressOfError = AO_Bit_Field;
} else if (op->getObjectKind() == OK_VectorComponent) {
  // The operand cannot be an element of a vector
  AddressOfError = AO_Vector_Element;
} else if (dcl) { // C99 6.5.3.2p1
  // We have an lvalue with a decl. Make sure the decl is not declared
  // with the register storage-class specifier.
  if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
    // in C++ it is not error to take address of a register
    // variable (c++03 7.1.1P3)
    if (vd->getStorageClass() == SC_Register &&
        !getLangOpts().CPlusPlus) {
      AddressOfError = AO_Register_Variable;
    }
  } else if (isa<MSPropertyDecl>(dcl)) {
    AddressOfError = AO_Property_Expansion;
  } else if (isa<FunctionTemplateDecl>(dcl)) {
    return Context.OverloadTy;
  } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
    // Okay: we can take the address of a field.
    // Could be a pointer to member, though, if there is an explicit
    // scope qualifier for the class.
    if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
      DeclContext *Ctx = dcl->getDeclContext();
      if (Ctx && Ctx->isRecord()) {
        if (dcl->getType()->isReferenceType()) {
          Diag(OpLoc,
               diag::err_cannot_form_pointer_to_member_of_reference_type)
            << dcl->getDeclName() << dcl->getType();
          return QualType();
        }

        while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
          Ctx = Ctx->getParent();

        QualType MPTy = Context.getMemberPointerType(
            op->getType(),
            Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
        // Under the MS ABI, lock down the inheritance model now.
        if (Context.getTargetInfo().getCXXABI().isMicrosoft())
          (void)isCompleteType(OpLoc, MPTy);
        return MPTy;
      }
    }
  } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl) &&
             !isa<BindingDecl>(dcl))
    llvm_unreachable("Unknown/unexpected decl type")::llvm::llvm_unreachable_internal("Unknown/unexpected decl type"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11332);
}

if (AddressOfError != AO_No_Error) {
  diagnoseAddressOfInvalidType(*this, OpLoc, op, AddressOfError);
  return QualType();
}

if (lval == Expr::LV_IncompleteVoidType) {
  // Taking the address of a void variable is technically illegal, but we
  // allow it in cases which are otherwise valid.
  // Example: "extern void x; void* y = &x;".
  Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
}

// If the operand has type "type", the result has type "pointer to type".
if (op->getType()->isObjCObjectType())
  return Context.getObjCObjectPointerType(op->getType());

CheckAddressOfPackedMember(op);

return Context.getPointerType(op->getType());
11354}

11356static void RecordModifiableNonNullParam(Sema &S, const Expr *Exp) {
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Exp);
if (!DRE)
  return;
const Decl *D = DRE->getDecl();
if (!D)
  return;
const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D);
if (!Param)
  return;
if (const FunctionDecl* FD = dyn_cast<FunctionDecl>(Param->getDeclContext()))
  if (!FD->hasAttr<NonNullAttr>() && !Param->hasAttr<NonNullAttr>())
    return;
if (FunctionScopeInfo *FD = S.getCurFunction())
  if (!FD->ModifiedNonNullParams.count(Param))
    FD->ModifiedNonNullParams.insert(Param);
11372}

11374/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
11375static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
                                      SourceLocation OpLoc) {
if (Op->isTypeDependent())
  return S.Context.DependentTy;

ExprResult ConvResult = S.UsualUnaryConversions(Op);
if (ConvResult.isInvalid())
  return QualType();
Op = ConvResult.get();
QualType OpTy = Op->getType();
QualType Result;

if (isa<CXXReinterpretCastExpr>(Op)) {
  QualType OpOrigType = Op->IgnoreParenCasts()->getType();
  S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
                                   Op->getSourceRange());
}

if (const PointerType *PT = OpTy->getAs<PointerType>())
{
  Result = PT->getPointeeType();
}
else if (const ObjCObjectPointerType *OPT =
           OpTy->getAs<ObjCObjectPointerType>())
  Result = OPT->getPointeeType();
else {
  ExprResult PR = S.CheckPlaceholderExpr(Op);
  if (PR.isInvalid()) return QualType();
  if (PR.get() != Op)
    return CheckIndirectionOperand(S, PR.get(), VK, OpLoc);
}

if (Result.isNull()) {
  S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
    << OpTy << Op->getSourceRange();
  return QualType();
}

// Note that per both C89 and C99, indirection is always legal, even if Result
// is an incomplete type or void.  It would be possible to warn about
// dereferencing a void pointer, but it's completely well-defined, and such a
// warning is unlikely to catch any mistakes. In C++, indirection is not valid
// for pointers to 'void' but is fine for any other pointer type:
//
// C++ [expr.unary.op]p1:
//   [...] the expression to which [the unary * operator] is applied shall
//   be a pointer to an object type, or a pointer to a function type
if (S.getLangOpts().CPlusPlus && Result->isVoidType())
  S.Diag(OpLoc, diag::ext_typecheck_indirection_through_void_pointer)
    << OpTy << Op->getSourceRange();

// Dereferences are usually l-values...
VK = VK_LValue;

// ...except that certain expressions are never l-values in C.
if (!S.getLangOpts().CPlusPlus && Result.isCForbiddenLValueType())
  VK = VK_RValue;

return Result;
11434}

11436BinaryOperatorKind Sema::ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind) {
BinaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown binop!")::llvm::llvm_unreachable_internal("Unknown binop!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11439);
case tok::periodstar:           Opc = BO_PtrMemD; break;
case tok::arrowstar:            Opc = BO_PtrMemI; break;
case tok::star:                 Opc = BO_Mul; break;
case tok::slash:                Opc = BO_Div; break;
case tok::percent:              Opc = BO_Rem; break;
case tok::plus:                 Opc = BO_Add; break;
case tok::minus:                Opc = BO_Sub; break;
case tok::lessless:             Opc = BO_Shl; break;
case tok::greatergreater:       Opc = BO_Shr; break;
case tok::lessequal:            Opc = BO_LE; break;
case tok::less:                 Opc = BO_LT; break;
case tok::greaterequal:         Opc = BO_GE; break;
case tok::greater:              Opc = BO_GT; break;
case tok::exclaimequal:         Opc = BO_NE; break;
case tok::equalequal:           Opc = BO_EQ; break;
case tok::spaceship:            Opc = BO_Cmp; break;
case tok::amp:                  Opc = BO_And; break;
case tok::caret:                Opc = BO_Xor; break;
case tok::pipe:                 Opc = BO_Or; break;
case tok::ampamp:               Opc = BO_LAnd; break;
case tok::pipepipe:             Opc = BO_LOr; break;
case tok::equal:                Opc = BO_Assign; break;
case tok::starequal:            Opc = BO_MulAssign; break;
case tok::slashequal:           Opc = BO_DivAssign; break;
case tok::percentequal:         Opc = BO_RemAssign; break;
case tok::plusequal:            Opc = BO_AddAssign; break;
case tok::minusequal:           Opc = BO_SubAssign; break;
case tok::lesslessequal:        Opc = BO_ShlAssign; break;
case tok::greatergreaterequal:  Opc = BO_ShrAssign; break;
case tok::ampequal:             Opc = BO_AndAssign; break;
case tok::caretequal:           Opc = BO_XorAssign; break;
case tok::pipeequal:            Opc = BO_OrAssign; break;
case tok::comma:                Opc = BO_Comma; break;
}
return Opc;
11475}

11477static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
tok::TokenKind Kind) {
UnaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown unary op!")::llvm::llvm_unreachable_internal("Unknown unary op!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11481);
case tok::plusplus:     Opc = UO_PreInc; break;
case tok::minusminus:   Opc = UO_PreDec; break;
case tok::amp:          Opc = UO_AddrOf; break;
case tok::star:         Opc = UO_Deref; break;
case tok::plus:         Opc = UO_Plus; break;
case tok::minus:        Opc = UO_Minus; break;
case tok::tilde:        Opc = UO_Not; break;
case tok::exclaim:      Opc = UO_LNot; break;
case tok::kw___real:    Opc = UO_Real; break;
case tok::kw___imag:    Opc = UO_Imag; break;
case tok::kw___extension__: Opc = UO_Extension; break;
}
return Opc;
11495}

11497/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
11498/// This warning suppressed in the event of macro expansions.
11499static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
                                 SourceLocation OpLoc) {
if (S.inTemplateInstantiation())
  return;
if (S.isUnevaluatedContext())
  return;
if (OpLoc.isInvalid() || OpLoc.isMacroID())
  return;
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();
const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
if (!LHSDeclRef || !RHSDeclRef ||
    LHSDeclRef->getLocation().isMacroID() ||
    RHSDeclRef->getLocation().isMacroID())
  return;
const ValueDecl *LHSDecl =
  cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
const ValueDecl *RHSDecl =
  cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
if (LHSDecl != RHSDecl)
  return;
if (LHSDecl->getType().isVolatileQualified())
  return;
if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
  if (RefTy->getPointeeType().isVolatileQualified())
    return;

S.Diag(OpLoc, diag::warn_self_assignment)
    << LHSDeclRef->getType()
    << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
11530}

11532/// Check if a bitwise-& is performed on an Objective-C pointer.  This
11533/// is usually indicative of introspection within the Objective-C pointer.
11534static void checkObjCPointerIntrospection(Sema &S, ExprResult &L, ExprResult &R,
                                        SourceLocation OpLoc) {
if (!S.getLangOpts().ObjC1)
  return;

const Expr *ObjCPointerExpr = nullptr, *OtherExpr = nullptr;
const Expr *LHS = L.get();
const Expr *RHS = R.get();

if (LHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
  ObjCPointerExpr = LHS;
  OtherExpr = RHS;
}
else if (RHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
  ObjCPointerExpr = RHS;
  OtherExpr = LHS;
}

// This warning is deliberately made very specific to reduce false
// positives with logic that uses '&' for hashing.  This logic mainly
// looks for code trying to introspect into tagged pointers, which
// code should generally never do.
if (ObjCPointerExpr && isa<IntegerLiteral>(OtherExpr->IgnoreParenCasts())) {
  unsigned Diag = diag::warn_objc_pointer_masking;
  // Determine if we are introspecting the result of performSelectorXXX.
  const Expr *Ex = ObjCPointerExpr->IgnoreParenCasts();
  // Special case messages to -performSelector and friends, which
  // can return non-pointer values boxed in a pointer value.
  // Some clients may wish to silence warnings in this subcase.
  if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(Ex)) {
    Selector S = ME->getSelector();
    StringRef SelArg0 = S.getNameForSlot(0);
    if (SelArg0.startswith("performSelector"))
      Diag = diag::warn_objc_pointer_masking_performSelector;
  }
  
  S.Diag(OpLoc, Diag)
    << ObjCPointerExpr->getSourceRange();
}
11573}

11575static NamedDecl *getDeclFromExpr(Expr *E) {
if (!E)
  return nullptr;
if (auto *DRE = dyn_cast<DeclRefExpr>(E))
  return DRE->getDecl();
if (auto *ME = dyn_cast<MemberExpr>(E))
  return ME->getMemberDecl();
if (auto *IRE = dyn_cast<ObjCIvarRefExpr>(E))
  return IRE->getDecl();
return nullptr;
11585}

11587// This helper function promotes a binary operator's operands (which are of a
11588// half vector type) to a vector of floats and then truncates the result to
11589// a vector of either half or short.
11590static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS,
                                    BinaryOperatorKind Opc, QualType ResultTy,
                                    ExprValueKind VK, ExprObjectKind OK,
                                    bool IsCompAssign, SourceLocation OpLoc,
                                    FPOptions FPFeatures) {
auto &Context = S.getASTContext();
assert((isVector(ResultTy, Context.HalfTy) ||(static_cast <bool> ((isVector(ResultTy, Context.HalfTy
) || isVector(ResultTy, Context.ShortTy)) && "Result must be a vector of half or short"
) ? void (0) : __assert_fail ("(isVector(ResultTy, Context.HalfTy) || isVector(ResultTy, Context.ShortTy)) && \"Result must be a vector of half or short\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11598, __extension__ __PRETTY_FUNCTION__))
        isVector(ResultTy, Context.ShortTy)) &&(static_cast <bool> ((isVector(ResultTy, Context.HalfTy
) || isVector(ResultTy, Context.ShortTy)) && "Result must be a vector of half or short"
) ? void (0) : __assert_fail ("(isVector(ResultTy, Context.HalfTy) || isVector(ResultTy, Context.ShortTy)) && \"Result must be a vector of half or short\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11598, __extension__ __PRETTY_FUNCTION__))
       "Result must be a vector of half or short")(static_cast <bool> ((isVector(ResultTy, Context.HalfTy
) || isVector(ResultTy, Context.ShortTy)) && "Result must be a vector of half or short"
) ? void (0) : __assert_fail ("(isVector(ResultTy, Context.HalfTy) || isVector(ResultTy, Context.ShortTy)) && \"Result must be a vector of half or short\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11598, __extension__ __PRETTY_FUNCTION__));
assert(isVector(LHS.get()->getType(), Context.HalfTy) &&(static_cast <bool> (isVector(LHS.get()->getType(), Context
.HalfTy) && isVector(RHS.get()->getType(), Context
.HalfTy) && "both operands expected to be a half vector"
) ? void (0) : __assert_fail ("isVector(LHS.get()->getType(), Context.HalfTy) && isVector(RHS.get()->getType(), Context.HalfTy) && \"both operands expected to be a half vector\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11601, __extension__ __PRETTY_FUNCTION__))
       isVector(RHS.get()->getType(), Context.HalfTy) &&(static_cast <bool> (isVector(LHS.get()->getType(), Context
.HalfTy) && isVector(RHS.get()->getType(), Context
.HalfTy) && "both operands expected to be a half vector"
) ? void (0) : __assert_fail ("isVector(LHS.get()->getType(), Context.HalfTy) && isVector(RHS.get()->getType(), Context.HalfTy) && \"both operands expected to be a half vector\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11601, __extension__ __PRETTY_FUNCTION__))
       "both operands expected to be a half vector")(static_cast <bool> (isVector(LHS.get()->getType(), Context
.HalfTy) && isVector(RHS.get()->getType(), Context
.HalfTy) && "both operands expected to be a half vector"
) ? void (0) : __assert_fail ("isVector(LHS.get()->getType(), Context.HalfTy) && isVector(RHS.get()->getType(), Context.HalfTy) && \"both operands expected to be a half vector\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11601, __extension__ __PRETTY_FUNCTION__));

RHS = convertVector(RHS.get(), Context.FloatTy, S);
QualType BinOpResTy = RHS.get()->getType();

// If Opc is a comparison, ResultType is a vector of shorts. In that case,
// change BinOpResTy to a vector of ints.
if (isVector(ResultTy, Context.ShortTy))
  BinOpResTy = S.GetSignedVectorType(BinOpResTy);

if (IsCompAssign)
  return new (Context) CompoundAssignOperator(
      LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, BinOpResTy, BinOpResTy,
      OpLoc, FPFeatures);

LHS = convertVector(LHS.get(), Context.FloatTy, S);
auto *BO = new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, BinOpResTy,
                                        VK, OK, OpLoc, FPFeatures);
return convertVector(BO, ResultTy->getAs<VectorType>()->getElementType(), S);
11620}

11622static std::pair<ExprResult, ExprResult>
11623CorrectDelayedTyposInBinOp(Sema &S, BinaryOperatorKind Opc, Expr *LHSExpr,
                         Expr *RHSExpr) {
ExprResult LHS = LHSExpr, RHS = RHSExpr;
if (!S.getLangOpts().CPlusPlus) {
  // C cannot handle TypoExpr nodes on either side of a binop because it
  // doesn't handle dependent types properly, so make sure any TypoExprs have
  // been dealt with before checking the operands.
  LHS = S.CorrectDelayedTyposInExpr(LHS);
  RHS = S.CorrectDelayedTyposInExpr(RHS, [Opc, LHS](Expr *E) {
    if (Opc != BO_Assign)
      return ExprResult(E);
    // Avoid correcting the RHS to the same Expr as the LHS.
    Decl *D = getDeclFromExpr(E);
    return (D && D == getDeclFromExpr(LHS.get())) ? ExprError() : E;
  });
}
return std::make_pair(LHS, RHS);
11640}

11642/// Returns true if conversion between vectors of halfs and vectors of floats
11643/// is needed.
11644static bool needsConversionOfHalfVec(bool OpRequiresConversion, ASTContext &Ctx,
                                   QualType SrcType) {
return OpRequiresConversion && !Ctx.getLangOpts().NativeHalfType &&
       !Ctx.getTargetInfo().useFP16ConversionIntrinsics() &&
       isVector(SrcType, Ctx.HalfTy);
11649}

11651/// CreateBuiltinBinOp - Creates a new built-in binary operation with
11652/// operator @p Opc at location @c TokLoc. This routine only supports
11653/// built-in operations; ActOnBinOp handles overloaded operators.
11654ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
                                  BinaryOperatorKind Opc,
                                  Expr *LHSExpr, Expr *RHSExpr) {
if (getLangOpts().CPlusPlus11 && isa<InitListExpr>(RHSExpr)) {
  // The syntax only allows initializer lists on the RHS of assignment,
  // so we don't need to worry about accepting invalid code for
  // non-assignment operators.
  // C++11 5.17p9:
  //   The meaning of x = {v} [...] is that of x = T(v) [...]. The meaning
  //   of x = {} is x = T().
  InitializationKind Kind = InitializationKind::CreateDirectList(
      RHSExpr->getLocStart(), RHSExpr->getLocStart(), RHSExpr->getLocEnd());
  InitializedEntity Entity =
      InitializedEntity::InitializeTemporary(LHSExpr->getType());
  InitializationSequence InitSeq(*this, Entity, Kind, RHSExpr);
  ExprResult Init = InitSeq.Perform(*this, Entity, Kind, RHSExpr);
  if (Init.isInvalid())
    return Init;
  RHSExpr = Init.get();
}

ExprResult LHS = LHSExpr, RHS = RHSExpr;
QualType ResultTy;     // Result type of the binary operator.
// The following two variables are used for compound assignment operators
QualType CompLHSTy;    // Type of LHS after promotions for computation
QualType CompResultTy; // Type of computation result
ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
bool ConvertHalfVec = false;

std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
if (!LHS.isUsable() || !RHS.isUsable())
  return ExprError();

if (getLangOpts().OpenCL) {
  QualType LHSTy = LHSExpr->getType();
  QualType RHSTy = RHSExpr->getType();
  // OpenCLC v2.0 s6.13.11.1 allows atomic variables to be initialized by
  // the ATOMIC_VAR_INIT macro.
  if (LHSTy->isAtomicType() || RHSTy->isAtomicType()) {
    SourceRange SR(LHSExpr->getLocStart(), RHSExpr->getLocEnd());
    if (BO_Assign == Opc)
      Diag(OpLoc, diag::err_opencl_atomic_init) << 0 << SR;
    else
      ResultTy = InvalidOperands(OpLoc, LHS, RHS);
    return ExprError();
  }

  // OpenCL special types - image, sampler, pipe, and blocks are to be used
  // only with a builtin functions and therefore should be disallowed here.
  if (LHSTy->isImageType() || RHSTy->isImageType() ||
      LHSTy->isSamplerT() || RHSTy->isSamplerT() ||
      LHSTy->isPipeType() || RHSTy->isPipeType() ||
      LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
    ResultTy = InvalidOperands(OpLoc, LHS, RHS);
    return ExprError();
  }
}

switch (Opc) {
case BO_Assign:
  ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
  if (getLangOpts().CPlusPlus &&
      LHS.get()->getObjectKind() != OK_ObjCProperty) {
    VK = LHS.get()->getValueKind();
    OK = LHS.get()->getObjectKind();
  }
  if (!ResultTy.isNull()) {
    DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
    DiagnoseSelfMove(LHS.get(), RHS.get(), OpLoc);
  }
  RecordModifiableNonNullParam(*this, LHS.get());
  break;
case BO_PtrMemD:
case BO_PtrMemI:
  ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
                                          Opc == BO_PtrMemI);
  break;
case BO_Mul:
case BO_Div:
  ConvertHalfVec = true;
  ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
                                         Opc == BO_Div);
  break;
case BO_Rem:
  ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
  break;
case BO_Add:
  ConvertHalfVec = true;
  ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc);
  break;
case BO_Sub:
  ConvertHalfVec = true;
  ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
  break;
case BO_Shl:
case BO_Shr:
  ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
  break;
case BO_LE:
case BO_LT:
case BO_GE:
case BO_GT:
  ConvertHalfVec = true;
  ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, true);
  break;
case BO_EQ:
case BO_NE:
  ConvertHalfVec = true;
  ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, false);
  break;
case BO_Cmp:
  // FIXME: Implement proper semantic checking of '<=>'.
  ConvertHalfVec = true;
  ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc, true);
  if (!ResultTy.isNull())
    ResultTy = Context.VoidTy;
  break;
case BO_And:
  checkObjCPointerIntrospection(*this, LHS, RHS, OpLoc);
  LLVM_FALLTHROUGH[[clang::fallthrough]];
case BO_Xor:
case BO_Or:
  ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
  break;
case BO_LAnd:
case BO_LOr:
  ConvertHalfVec = true;
  ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
  break;
case BO_MulAssign:
case BO_DivAssign:
  ConvertHalfVec = true;
  CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
                                             Opc == BO_DivAssign);
  CompLHSTy = CompResultTy;
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_RemAssign:
  CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
  CompLHSTy = CompResultTy;
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_AddAssign:
  ConvertHalfVec = true;
  CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc, &CompLHSTy);
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_SubAssign:
  ConvertHalfVec = true;
  CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_ShlAssign:
case BO_ShrAssign:
  CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
  CompLHSTy = CompResultTy;
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_AndAssign:
case BO_OrAssign: // fallthrough
  DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
  LLVM_FALLTHROUGH[[clang::fallthrough]];
case BO_XorAssign:
  CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
  CompLHSTy = CompResultTy;
  if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
  break;
case BO_Comma:
  ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
  if (getLangOpts().CPlusPlus && !RHS.isInvalid()) {
    VK = RHS.get()->getValueKind();
    OK = RHS.get()->getObjectKind();
  }
  break;
}
if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
  return ExprError();

// Some of the binary operations require promoting operands of half vector to
// float vectors and truncating the result back to half vector. For now, we do
// this only when HalfArgsAndReturn is set (that is, when the target is arm or
// arm64).
assert(isVector(RHS.get()->getType(), Context.HalfTy) ==(static_cast <bool> (isVector(RHS.get()->getType(), Context
.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy)
 && "both sides are half vectors or neither sides are"
) ? void (0) : __assert_fail ("isVector(RHS.get()->getType(), Context.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy) && \"both sides are half vectors or neither sides are\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11845, __extension__ __PRETTY_FUNCTION__))
       isVector(LHS.get()->getType(), Context.HalfTy) &&(static_cast <bool> (isVector(RHS.get()->getType(), Context
.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy)
 && "both sides are half vectors or neither sides are"
) ? void (0) : __assert_fail ("isVector(RHS.get()->getType(), Context.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy) && \"both sides are half vectors or neither sides are\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11845, __extension__ __PRETTY_FUNCTION__))
       "both sides are half vectors or neither sides are")(static_cast <bool> (isVector(RHS.get()->getType(), Context
.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy)
 && "both sides are half vectors or neither sides are"
) ? void (0) : __assert_fail ("isVector(RHS.get()->getType(), Context.HalfTy) == isVector(LHS.get()->getType(), Context.HalfTy) && \"both sides are half vectors or neither sides are\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11845, __extension__ __PRETTY_FUNCTION__));
ConvertHalfVec = needsConversionOfHalfVec(ConvertHalfVec, Context,
                                          LHS.get()->getType());

// Check for array bounds violations for both sides of the BinaryOperator
CheckArrayAccess(LHS.get());
CheckArrayAccess(RHS.get());

if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(LHS.get()->IgnoreParenCasts())) {
  NamedDecl *ObjectSetClass = LookupSingleName(TUScope,
                                               &Context.Idents.get("object_setClass"),
                                               SourceLocation(), LookupOrdinaryName);
  if (ObjectSetClass && isa<ObjCIsaExpr>(LHS.get())) {
    SourceLocation RHSLocEnd = getLocForEndOfToken(RHS.get()->getLocEnd());
    Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign) <<
    FixItHint::CreateInsertion(LHS.get()->getLocStart(), "object_setClass(") <<
    FixItHint::CreateReplacement(SourceRange(OISA->getOpLoc(), OpLoc), ",") <<
    FixItHint::CreateInsertion(RHSLocEnd, ")");
  }
  else
    Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign);
}
else if (const ObjCIvarRefExpr *OIRE =
         dyn_cast<ObjCIvarRefExpr>(LHS.get()->IgnoreParenCasts()))
  DiagnoseDirectIsaAccess(*this, OIRE, OpLoc, RHS.get());

// Opc is not a compound assignment if CompResultTy is null.
if (CompResultTy.isNull()) {
  if (ConvertHalfVec)
    return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, false,
                               OpLoc, FPFeatures);
  return new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, ResultTy, VK,
                                      OK, OpLoc, FPFeatures);
}

// Handle compound assignments.
if (getLangOpts().CPlusPlus && LHS.get()->getObjectKind() !=
    OK_ObjCProperty) {
  VK = VK_LValue;
  OK = LHS.get()->getObjectKind();
}

if (ConvertHalfVec)
  return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, true,
                             OpLoc, FPFeatures);

return new (Context) CompoundAssignOperator(
    LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, CompLHSTy, CompResultTy,
    OpLoc, FPFeatures);
11894}

11896/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
11897/// operators are mixed in a way that suggests that the programmer forgot that
11898/// comparison operators have higher precedence. The most typical example of
11899/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
11900static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
                                    SourceLocation OpLoc, Expr *LHSExpr,
                                    Expr *RHSExpr) {
BinaryOperator *LHSBO = dyn_cast<BinaryOperator>(LHSExpr);
BinaryOperator *RHSBO = dyn_cast<BinaryOperator>(RHSExpr);

// Check that one of the sides is a comparison operator and the other isn't.
bool isLeftComp = LHSBO && LHSBO->isComparisonOp();
bool isRightComp = RHSBO && RHSBO->isComparisonOp();
if (isLeftComp == isRightComp)
  return;

// Bitwise operations are sometimes used as eager logical ops.
// Don't diagnose this.
bool isLeftBitwise = LHSBO && LHSBO->isBitwiseOp();
bool isRightBitwise = RHSBO && RHSBO->isBitwiseOp();
if (isLeftBitwise || isRightBitwise)
  return;

SourceRange DiagRange = isLeftComp ? SourceRange(LHSExpr->getLocStart(),
                                                 OpLoc)
                                   : SourceRange(OpLoc, RHSExpr->getLocEnd());
StringRef OpStr = isLeftComp ? LHSBO->getOpcodeStr() : RHSBO->getOpcodeStr();
SourceRange ParensRange = isLeftComp ?
    SourceRange(LHSBO->getRHS()->getLocStart(), RHSExpr->getLocEnd())
  : SourceRange(LHSExpr->getLocStart(), RHSBO->getLHS()->getLocEnd());

Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
  << DiagRange << BinaryOperator::getOpcodeStr(Opc) << OpStr;
SuggestParentheses(Self, OpLoc,
  Self.PDiag(diag::note_precedence_silence) << OpStr,
  (isLeftComp ? LHSExpr : RHSExpr)->getSourceRange());
SuggestParentheses(Self, OpLoc,
  Self.PDiag(diag::note_precedence_bitwise_first)
    << BinaryOperator::getOpcodeStr(Opc),
  ParensRange);
11936}

11938/// \brief It accepts a '&&' expr that is inside a '||' one.
11939/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
11940/// in parentheses.
11941static void
11942EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
                                     BinaryOperator *Bop) {
assert(Bop->getOpcode() == BO_LAnd)(static_cast <bool> (Bop->getOpcode() == BO_LAnd) ? void
 (0) : __assert_fail ("Bop->getOpcode() == BO_LAnd", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 11944, __extension__ __PRETTY_FUNCTION__));
Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
    << Bop->getSourceRange() << OpLoc;
SuggestParentheses(Self, Bop->getOperatorLoc(),
  Self.PDiag(diag::note_precedence_silence)
    << Bop->getOpcodeStr(),
  Bop->getSourceRange());
11951}

11953/// \brief Returns true if the given expression can be evaluated as a constant
11954/// 'true'.
11955static bool EvaluatesAsTrue(Sema &S, Expr *E) {
bool Res;
return !E->isValueDependent() &&
       E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
11959}

11961/// \brief Returns true if the given expression can be evaluated as a constant
11962/// 'false'.
11963static bool EvaluatesAsFalse(Sema &S, Expr *E) {
bool Res;
return !E->isValueDependent() &&
       E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
11967}

11969/// \brief Look for '&&' in the left hand of a '||' expr.
11970static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
                                           Expr *LHSExpr, Expr *RHSExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
  if (Bop->getOpcode() == BO_LAnd) {
    // If it's "a && b || 0" don't warn since the precedence doesn't matter.
    if (EvaluatesAsFalse(S, RHSExpr))
      return;
    // If it's "1 && a || b" don't warn since the precedence doesn't matter.
    if (!EvaluatesAsTrue(S, Bop->getLHS()))
      return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
  } else if (Bop->getOpcode() == BO_LOr) {
    if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
      // If it's "a || b && 1 || c" we didn't warn earlier for
      // "a || b && 1", but warn now.
      if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
        return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
    }
  }
}
11989}

11991/// \brief Look for '&&' in the right hand of a '||' expr.
11992static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
                                           Expr *LHSExpr, Expr *RHSExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
  if (Bop->getOpcode() == BO_LAnd) {
    // If it's "0 || a && b" don't warn since the precedence doesn't matter.
    if (EvaluatesAsFalse(S, LHSExpr))
      return;
    // If it's "a || b && 1" don't warn since the precedence doesn't matter.
    if (!EvaluatesAsTrue(S, Bop->getRHS()))
      return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
  }
}
12004}

12006/// \brief Look for bitwise op in the left or right hand of a bitwise op with
12007/// lower precedence and emit a diagnostic together with a fixit hint that wraps
12008/// the '&' expression in parentheses.
12009static void DiagnoseBitwiseOpInBitwiseOp(Sema &S, BinaryOperatorKind Opc,
                                       SourceLocation OpLoc, Expr *SubExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
  if (Bop->isBitwiseOp() && Bop->getOpcode() < Opc) {
    S.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_op_in_bitwise_op)
      << Bop->getOpcodeStr() << BinaryOperator::getOpcodeStr(Opc)
      << Bop->getSourceRange() << OpLoc;
    SuggestParentheses(S, Bop->getOperatorLoc(),
      S.PDiag(diag::note_precedence_silence)
        << Bop->getOpcodeStr(),
      Bop->getSourceRange());
  }
}
12022}

12024static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc,
                                  Expr *SubExpr, StringRef Shift) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
  if (Bop->getOpcode() == BO_Add || Bop->getOpcode() == BO_Sub) {
    StringRef Op = Bop->getOpcodeStr();
    S.Diag(Bop->getOperatorLoc(), diag::warn_addition_in_bitshift)
        << Bop->getSourceRange() << OpLoc << Shift << Op;
    SuggestParentheses(S, Bop->getOperatorLoc(),
        S.PDiag(diag::note_precedence_silence) << Op,
        Bop->getSourceRange());
  }
}
12036}

12038static void DiagnoseShiftCompare(Sema &S, SourceLocation OpLoc,
                               Expr *LHSExpr, Expr *RHSExpr) {
CXXOperatorCallExpr *OCE = dyn_cast<CXXOperatorCallExpr>(LHSExpr);
if (!OCE)
  return;

FunctionDecl *FD = OCE->getDirectCallee();
if (!FD || !FD->isOverloadedOperator())
  return;

OverloadedOperatorKind Kind = FD->getOverloadedOperator();
if (Kind != OO_LessLess && Kind != OO_GreaterGreater)
  return;

S.Diag(OpLoc, diag::warn_overloaded_shift_in_comparison)
    << LHSExpr->getSourceRange() << RHSExpr->getSourceRange()
    << (Kind == OO_LessLess);
SuggestParentheses(S, OCE->getOperatorLoc(),
                   S.PDiag(diag::note_precedence_silence)
                       << (Kind == OO_LessLess ? "<<" : ">>"),
                   OCE->getSourceRange());
SuggestParentheses(S, OpLoc,
                   S.PDiag(diag::note_evaluate_comparison_first),
                   SourceRange(OCE->getArg(1)->getLocStart(),
                               RHSExpr->getLocEnd()));
12063}

12065/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
12066/// precedence.
12067static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
                                  SourceLocation OpLoc, Expr *LHSExpr,
                                  Expr *RHSExpr){
// Diagnose "arg1 'bitwise' arg2 'eq' arg3".
if (BinaryOperator::isBitwiseOp(Opc))
  DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);

// Diagnose "arg1 & arg2 | arg3"
if ((Opc == BO_Or || Opc == BO_Xor) &&
    !OpLoc.isMacroID()/* Don't warn in macros. */) {
  DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, LHSExpr);
  DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, RHSExpr);
}

// Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
// We don't warn for 'assert(a || b && "bad")' since this is safe.
if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
  DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
  DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
}

if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
    || Opc == BO_Shr) {
  StringRef Shift = BinaryOperator::getOpcodeStr(Opc);
  DiagnoseAdditionInShift(Self, OpLoc, LHSExpr, Shift);
  DiagnoseAdditionInShift(Self, OpLoc, RHSExpr, Shift);
}

// Warn on overloaded shift operators and comparisons, such as:
// cout << 5 == 4;
if (BinaryOperator::isComparisonOp(Opc))
  DiagnoseShiftCompare(Self, OpLoc, LHSExpr, RHSExpr);
12099}

12101// Binary Operators.  'Tok' is the token for the operator.
12102ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
                          tok::TokenKind Kind,
                          Expr *LHSExpr, Expr *RHSExpr) {
BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
assert(LHSExpr && "ActOnBinOp(): missing left expression")(static_cast <bool> (LHSExpr && "ActOnBinOp(): missing left expression"
) ? void (0) : __assert_fail ("LHSExpr && \"ActOnBinOp(): missing left expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12106, __extension__ __PRETTY_FUNCTION__));
assert(RHSExpr && "ActOnBinOp(): missing right expression")(static_cast <bool> (RHSExpr && "ActOnBinOp(): missing right expression"
) ? void (0) : __assert_fail ("RHSExpr && \"ActOnBinOp(): missing right expression\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12107, __extension__ __PRETTY_FUNCTION__));

// Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);

return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
12113}

12115/// Build an overloaded binary operator expression in the given scope.
12116static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
                                     BinaryOperatorKind Opc,
                                     Expr *LHS, Expr *RHS) {
switch (Opc) {
case BO_Assign:
case BO_DivAssign:
case BO_RemAssign:
case BO_SubAssign:
case BO_AndAssign:
case BO_OrAssign:
case BO_XorAssign:
  DiagnoseSelfAssignment(S, LHS, RHS, OpLoc);
  CheckIdentityFieldAssignment(LHS, RHS, OpLoc, S);
  break;
default:
  break;
}

// Find all of the overloaded operators visible from this
// point. We perform both an operator-name lookup from the local
// scope and an argument-dependent lookup based on the types of
// the arguments.
UnresolvedSet<16> Functions;
OverloadedOperatorKind OverOp
  = BinaryOperator::getOverloadedOperator(Opc);
if (Sc && OverOp != OO_None && OverOp != OO_Equal)
  S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
                                 RHS->getType(), Functions);

// Build the (potentially-overloaded, potentially-dependent)
// binary operation.
return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
12148}

12150ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
                          BinaryOperatorKind Opc,
                          Expr *LHSExpr, Expr *RHSExpr) {
ExprResult LHS, RHS;
std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
if (!LHS.isUsable() || !RHS.isUsable())
  return ExprError();
LHSExpr = LHS.get();
RHSExpr = RHS.get();

// We want to end up calling one of checkPseudoObjectAssignment
// (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
// both expressions are overloadable or either is type-dependent),
// or CreateBuiltinBinOp (in any other case).  We also want to get
// any placeholder types out of the way.

// Handle pseudo-objects in the LHS.
if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
  // Assignments with a pseudo-object l-value need special analysis.
  if (pty->getKind() == BuiltinType::PseudoObject &&
      BinaryOperator::isAssignmentOp(Opc))
    return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);

  // Don't resolve overloads if the other type is overloadable.
  if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload) {
    // We can't actually test that if we still have a placeholder,
    // though.  Fortunately, none of the exceptions we see in that
    // code below are valid when the LHS is an overload set.  Note
    // that an overload set can be dependently-typed, but it never
    // instantiates to having an overloadable type.
    ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
    if (resolvedRHS.isInvalid()) return ExprError();
    RHSExpr = resolvedRHS.get();

    if (RHSExpr->isTypeDependent() ||
        RHSExpr->getType()->isOverloadableType())
      return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
  }

  // If we're instantiating "a.x < b" or "A::x < b" and 'x' names a function
  // template, diagnose the missing 'template' keyword instead of diagnosing
  // an invalid use of a bound member function.
  //
  // Note that "A::x < b" might be valid if 'b' has an overloadable type due
  // to C++1z [over.over]/1.4, but we already checked for that case above.
  if (Opc == BO_LT && inTemplateInstantiation() &&
      (pty->getKind() == BuiltinType::BoundMember ||
       pty->getKind() == BuiltinType::Overload)) {
    auto *OE = dyn_cast<OverloadExpr>(LHSExpr);
    if (OE && !OE->hasTemplateKeyword() && !OE->hasExplicitTemplateArgs() &&
        std::any_of(OE->decls_begin(), OE->decls_end(), [](NamedDecl *ND) {
          return isa<FunctionTemplateDecl>(ND);
        })) {
      Diag(OE->getQualifier() ? OE->getQualifierLoc().getBeginLoc()
                              : OE->getNameLoc(),
           diag::err_template_kw_missing)
        << OE->getName().getAsString() << "";
      return ExprError();
    }
  }
      
  ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
  if (LHS.isInvalid()) return ExprError();
  LHSExpr = LHS.get();
}

// Handle pseudo-objects in the RHS.
if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
  // An overload in the RHS can potentially be resolved by the type
  // being assigned to.
  if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
    if (getLangOpts().CPlusPlus &&
        (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent() ||
         LHSExpr->getType()->isOverloadableType()))
      return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);

    return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
  }

  // Don't resolve overloads if the other type is overloadable.
  if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload &&
      LHSExpr->getType()->isOverloadableType())
    return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);

  ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
  if (!resolvedRHS.isUsable()) return ExprError();
  RHSExpr = resolvedRHS.get();
}

if (getLangOpts().CPlusPlus) {
  // If either expression is type-dependent, always build an
  // overloaded op.
  if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
    return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);

  // Otherwise, build an overloaded op if either expression has an
  // overloadable type.
  if (LHSExpr->getType()->isOverloadableType() ||
      RHSExpr->getType()->isOverloadableType())
    return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
}

// Build a built-in binary operation.
return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
12254}

12256static bool isOverflowingIntegerType(ASTContext &Ctx, QualType T) {
if (T.isNull() || T->isDependentType())
  return false;

if (!T->isPromotableIntegerType())
  return true;

return Ctx.getIntWidth(T) >= Ctx.getIntWidth(Ctx.IntTy);
12264}

12266ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
                                    UnaryOperatorKind Opc,
                                    Expr *InputExpr) {
ExprResult Input = InputExpr;
ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
QualType resultType;
bool CanOverflow = false;

bool ConvertHalfVec = false;
if (getLangOpts().OpenCL) {
  QualType Ty = InputExpr->getType();
  // The only legal unary operation for atomics is '&'.
  if ((Opc != UO_AddrOf && Ty->isAtomicType()) ||
  // OpenCL special types - image, sampler, pipe, and blocks are to be used
  // only with a builtin functions and therefore should be disallowed here.
      (Ty->isImageType() || Ty->isSamplerT() || Ty->isPipeType()
      || Ty->isBlockPointerType())) {
    return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                     << InputExpr->getType()
                     << Input.get()->getSourceRange());
  }
}
switch (Opc) {
case UO_PreInc:
case UO_PreDec:
case UO_PostInc:
case UO_PostDec:
  resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OK,
                                              OpLoc,
                                              Opc == UO_PreInc ||
                                              Opc == UO_PostInc,
                                              Opc == UO_PreInc ||
                                              Opc == UO_PreDec);
  CanOverflow = isOverflowingIntegerType(Context, resultType);
  break;
case UO_AddrOf:
  resultType = CheckAddressOfOperand(Input, OpLoc);
  RecordModifiableNonNullParam(*this, InputExpr);
  break;
case UO_Deref: {
  Input = DefaultFunctionArrayLvalueConversion(Input.get());
  if (Input.isInvalid()) return ExprError();
  resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
  break;
}
case UO_Plus:
case UO_Minus:
  CanOverflow = Opc == UO_Minus &&
                isOverflowingIntegerType(Context, Input.get()->getType());
  Input = UsualUnaryConversions(Input.get());
  if (Input.isInvalid()) return ExprError();
  // Unary plus and minus require promoting an operand of half vector to a
  // float vector and truncating the result back to a half vector. For now, we
  // do this only when HalfArgsAndReturns is set (that is, when the target is
  // arm or arm64).
  ConvertHalfVec =
      needsConversionOfHalfVec(true, Context, Input.get()->getType());

  // If the operand is a half vector, promote it to a float vector.
  if (ConvertHalfVec)
    Input = convertVector(Input.get(), Context.FloatTy, *this);
  resultType = Input.get()->getType();
  if (resultType->isDependentType())
    break;
  if (resultType->isArithmeticType()) // C99 6.5.3.3p1
    break;
  else if (resultType->isVectorType() &&
           // The z vector extensions don't allow + or - with bool vectors.
           (!Context.getLangOpts().ZVector ||
            resultType->getAs<VectorType>()->getVectorKind() !=
            VectorType::AltiVecBool))
    break;
  else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
           Opc == UO_Plus &&
           resultType->isPointerType())
    break;

  return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
    << resultType << Input.get()->getSourceRange());

case UO_Not: // bitwise complement
  Input = UsualUnaryConversions(Input.get());
  if (Input.isInvalid())
    return ExprError();
  resultType = Input.get()->getType();

  if (resultType->isDependentType())
    break;
  // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
  if (resultType->isComplexType() || resultType->isComplexIntegerType())
    // C99 does not support '~' for complex conjugation.
    Diag(OpLoc, diag::ext_integer_complement_complex)
        << resultType << Input.get()->getSourceRange();
  else if (resultType->hasIntegerRepresentation())
    break;
  else if (resultType->isExtVectorType() && Context.getLangOpts().OpenCL) {
    // OpenCL v1.1 s6.3.f: The bitwise operator not (~) does not operate
    // on vector float types.
    QualType T = resultType->getAs<ExtVectorType>()->getElementType();
    if (!T->isIntegerType())
      return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                        << resultType << Input.get()->getSourceRange());
  } else {
    return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                     << resultType << Input.get()->getSourceRange());
  }
  break;

case UO_LNot: // logical negation
  // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
  Input = DefaultFunctionArrayLvalueConversion(Input.get());
  if (Input.isInvalid()) return ExprError();
  resultType = Input.get()->getType();

  // Though we still have to promote half FP to float...
  if (resultType->isHalfType() && !Context.getLangOpts().NativeHalfType) {
    Input = ImpCastExprToType(Input.get(), Context.FloatTy, CK_FloatingCast).get();
    resultType = Context.FloatTy;
  }

  if (resultType->isDependentType())
    break;
  if (resultType->isScalarType() && !isScopedEnumerationType(resultType)) {
    // C99 6.5.3.3p1: ok, fallthrough;
    if (Context.getLangOpts().CPlusPlus) {
      // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
      // operand contextually converted to bool.
      Input = ImpCastExprToType(Input.get(), Context.BoolTy,
                                ScalarTypeToBooleanCastKind(resultType));
    } else if (Context.getLangOpts().OpenCL &&
               Context.getLangOpts().OpenCLVersion < 120) {
      // OpenCL v1.1 6.3.h: The logical operator not (!) does not
      // operate on scalar float types.
      if (!resultType->isIntegerType() && !resultType->isPointerType())
        return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                         << resultType << Input.get()->getSourceRange());
    }
  } else if (resultType->isExtVectorType()) {
    if (Context.getLangOpts().OpenCL &&
        Context.getLangOpts().OpenCLVersion < 120) {
      // OpenCL v1.1 6.3.h: The logical operator not (!) does not
      // operate on vector float types.
      QualType T = resultType->getAs<ExtVectorType>()->getElementType();
      if (!T->isIntegerType())
        return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                         << resultType << Input.get()->getSourceRange());
    }
    // Vector logical not returns the signed variant of the operand type.
    resultType = GetSignedVectorType(resultType);
    break;
  } else {
    // FIXME: GCC's vector extension permits the usage of '!' with a vector
    //        type in C++. We should allow that here too.
    return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
      << resultType << Input.get()->getSourceRange());
  }
  
  // LNot always has type int. C99 6.5.3.3p5.
  // In C++, it's bool. C++ 5.3.1p8
  resultType = Context.getLogicalOperationType();
  break;
case UO_Real:
case UO_Imag:
  resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
  // _Real maps ordinary l-values into ordinary l-values. _Imag maps ordinary
  // complex l-values to ordinary l-values and all other values to r-values.
  if (Input.isInvalid()) return ExprError();
  if (Opc == UO_Real || Input.get()->getType()->isAnyComplexType()) {
    if (Input.get()->getValueKind() != VK_RValue &&
        Input.get()->getObjectKind() == OK_Ordinary)
      VK = Input.get()->getValueKind();
  } else if (!getLangOpts().CPlusPlus) {
    // In C, a volatile scalar is read by __imag. In C++, it is not.
    Input = DefaultLvalueConversion(Input.get());
  }
  break;
case UO_Extension:
  resultType = Input.get()->getType();
  VK = Input.get()->getValueKind();
  OK = Input.get()->getObjectKind();
  break;
case UO_Coawait:
  // It's unnecessary to represent the pass-through operator co_await in the
  // AST; just return the input expression instead.
  assert(!Input.get()->getType()->isDependentType() &&(static_cast <bool> (!Input.get()->getType()->isDependentType
() && "the co_await expression must be non-dependant before "
 "building operator co_await") ? void (0) : __assert_fail ("!Input.get()->getType()->isDependentType() && \"the co_await expression must be non-dependant before \" \"building operator co_await\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12453, __extension__ __PRETTY_FUNCTION__))
                 "the co_await expression must be non-dependant before "(static_cast <bool> (!Input.get()->getType()->isDependentType
() && "the co_await expression must be non-dependant before "
 "building operator co_await") ? void (0) : __assert_fail ("!Input.get()->getType()->isDependentType() && \"the co_await expression must be non-dependant before \" \"building operator co_await\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12453, __extension__ __PRETTY_FUNCTION__))
                 "building operator co_await")(static_cast <bool> (!Input.get()->getType()->isDependentType
() && "the co_await expression must be non-dependant before "
 "building operator co_await") ? void (0) : __assert_fail ("!Input.get()->getType()->isDependentType() && \"the co_await expression must be non-dependant before \" \"building operator co_await\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12453, __extension__ __PRETTY_FUNCTION__));
  return Input;
}
if (resultType.isNull() || Input.isInvalid())
  return ExprError();

// Check for array bounds violations in the operand of the UnaryOperator,
// except for the '*' and '&' operators that have to be handled specially
// by CheckArrayAccess (as there are special cases like &array[arraysize]
// that are explicitly defined as valid by the standard).
if (Opc != UO_AddrOf && Opc != UO_Deref)
  CheckArrayAccess(Input.get());

auto *UO = new (Context)
    UnaryOperator(Input.get(), Opc, resultType, VK, OK, OpLoc, CanOverflow);
// Convert the result back to a half vector.
if (ConvertHalfVec)
  return convertVector(UO, Context.HalfTy, *this);
return UO;
12472}

12474/// \brief Determine whether the given expression is a qualified member
12475/// access expression, of a form that could be turned into a pointer to member
12476/// with the address-of operator.
12477static bool isQualifiedMemberAccess(Expr *E) {
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
  if (!DRE->getQualifier())
    return false;
  
  ValueDecl *VD = DRE->getDecl();
  if (!VD->isCXXClassMember())
    return false;
  
  if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
    return true;
  if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
    return Method->isInstance();
    
  return false;
}

if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
  if (!ULE->getQualifier())
    return false;
  
  for (NamedDecl *D : ULE->decls()) {
    if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
      if (Method->isInstance())
        return true;
    } else {
      // Overload set does not contain methods.
      break;
    }
  }
  
  return false;
}

return false;
12512}

12514ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
                            UnaryOperatorKind Opc, Expr *Input) {
// First things first: handle placeholders so that the
// overloaded-operator check considers the right type.
if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
  // Increment and decrement of pseudo-object references.
  if (pty->getKind() == BuiltinType::PseudoObject &&
      UnaryOperator::isIncrementDecrementOp(Opc))
    return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);

  // extension is always a builtin operator.
  if (Opc == UO_Extension)
    return CreateBuiltinUnaryOp(OpLoc, Opc, Input);

  // & gets special logic for several kinds of placeholder.
  // The builtin code knows what to do.
  if (Opc == UO_AddrOf &&
      (pty->getKind() == BuiltinType::Overload ||
       pty->getKind() == BuiltinType::UnknownAny ||
       pty->getKind() == BuiltinType::BoundMember))
    return CreateBuiltinUnaryOp(OpLoc, Opc, Input);

  // Anything else needs to be handled now.
  ExprResult Result = CheckPlaceholderExpr(Input);
  if (Result.isInvalid()) return ExprError();
  Input = Result.get();
}

if (getLangOpts().CPlusPlus && Input->getType()->isOverloadableType() &&
    UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
    !(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
  // Find all of the overloaded operators visible from this
  // point. We perform both an operator-name lookup from the local
  // scope and an argument-dependent lookup based on the types of
  // the arguments.
  UnresolvedSet<16> Functions;
  OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
  if (S && OverOp != OO_None)
    LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
                                 Functions);

  return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
}

return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
12559}

12561// Unary Operators.  'Tok' is the token for the operator.
12562ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
                            tok::TokenKind Op, Expr *Input) {
return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
12565}

12567/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
12568ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
                              LabelDecl *TheDecl) {
TheDecl->markUsed(Context);
// Create the AST node.  The address of a label always has type 'void*'.
return new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
                                   Context.getPointerType(Context.VoidTy));
12574}

12576/// Given the last statement in a statement-expression, check whether
12577/// the result is a producing expression (like a call to an
12578/// ns_returns_retained function) and, if so, rebuild it to hoist the
12579/// release out of the full-expression.  Otherwise, return null.
12580/// Cannot fail.
12581static Expr *maybeRebuildARCConsumingStmt(Stmt *Statement) {
// Should always be wrapped with one of these.
ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(Statement);
if (!cleanups) return nullptr;

ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
if (!cast || cast->getCastKind() != CK_ARCConsumeObject)
  return nullptr;

// Splice out the cast.  This shouldn't modify any interesting
// features of the statement.
Expr *producer = cast->getSubExpr();
assert(producer->getType() == cast->getType())(static_cast <bool> (producer->getType() == cast->
getType()) ? void (0) : __assert_fail ("producer->getType() == cast->getType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12593, __extension__ __PRETTY_FUNCTION__));
assert(producer->getValueKind() == cast->getValueKind())(static_cast <bool> (producer->getValueKind() == cast
->getValueKind()) ? void (0) : __assert_fail ("producer->getValueKind() == cast->getValueKind()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12594, __extension__ __PRETTY_FUNCTION__));
cleanups->setSubExpr(producer);
return cleanups;
12597}

12599void Sema::ActOnStartStmtExpr() {
PushExpressionEvaluationContext(ExprEvalContexts.back().Context);
12601}

12603void Sema::ActOnStmtExprError() {
// Note that function is also called by TreeTransform when leaving a
// StmtExpr scope without rebuilding anything.

DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();
12609}

12611ExprResult
12612Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
                  SourceLocation RPLoc) { // "({..})"
assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!")(static_cast <bool> (SubStmt && isa<CompoundStmt
>(SubStmt) && "Invalid action invocation!") ? void
 (0) : __assert_fail ("SubStmt && isa<CompoundStmt>(SubStmt) && \"Invalid action invocation!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12614, __extension__ __PRETTY_FUNCTION__));
CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);

if (hasAnyUnrecoverableErrorsInThisFunction())
  DiscardCleanupsInEvaluationContext();
assert(!Cleanup.exprNeedsCleanups() &&(static_cast <bool> (!Cleanup.exprNeedsCleanups() &&
 "cleanups within StmtExpr not correctly bound!") ? void (0) :
 __assert_fail ("!Cleanup.exprNeedsCleanups() && \"cleanups within StmtExpr not correctly bound!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12620, __extension__ __PRETTY_FUNCTION__))
       "cleanups within StmtExpr not correctly bound!")(static_cast <bool> (!Cleanup.exprNeedsCleanups() &&
 "cleanups within StmtExpr not correctly bound!") ? void (0) :
 __assert_fail ("!Cleanup.exprNeedsCleanups() && \"cleanups within StmtExpr not correctly bound!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12620, __extension__ __PRETTY_FUNCTION__));
PopExpressionEvaluationContext();

// FIXME: there are a variety of strange constraints to enforce here, for
// example, it is not possible to goto into a stmt expression apparently.
// More semantic analysis is needed.

// If there are sub-stmts in the compound stmt, take the type of the last one
// as the type of the stmtexpr.
QualType Ty = Context.VoidTy;
bool StmtExprMayBindToTemp = false;
if (!Compound->body_empty()) {
  Stmt *LastStmt = Compound->body_back();
  LabelStmt *LastLabelStmt = nullptr;
  // If LastStmt is a label, skip down through into the body.
  while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
    LastLabelStmt = Label;
    LastStmt = Label->getSubStmt();
  }

  if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
    // Do function/array conversion on the last expression, but not
    // lvalue-to-rvalue.  However, initialize an unqualified type.
    ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
    if (LastExpr.isInvalid())
      return ExprError();
    Ty = LastExpr.get()->getType().getUnqualifiedType();

    if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
      // In ARC, if the final expression ends in a consume, splice
      // the consume out and bind it later.  In the alternate case
      // (when dealing with a retainable type), the result
      // initialization will create a produce.  In both cases the
      // result will be +1, and we'll need to balance that out with
      // a bind.
      if (Expr *rebuiltLastStmt
            = maybeRebuildARCConsumingStmt(LastExpr.get())) {
        LastExpr = rebuiltLastStmt;
      } else {
        LastExpr = PerformCopyInitialization(
                          InitializedEntity::InitializeResult(LPLoc, 
                                                              Ty,
                                                              false),
                                                 SourceLocation(),
                                             LastExpr);
      }

      if (LastExpr.isInvalid())
        return ExprError();
      if (LastExpr.get() != nullptr) {
        if (!LastLabelStmt)
          Compound->setLastStmt(LastExpr.get());
        else
          LastLabelStmt->setSubStmt(LastExpr.get());
        StmtExprMayBindToTemp = true;
      }
    }
  }
}

// FIXME: Check that expression type is complete/non-abstract; statement
// expressions are not lvalues.
Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
if (StmtExprMayBindToTemp)
  return MaybeBindToTemporary(ResStmtExpr);
return ResStmtExpr;
12686}

12688ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
                                    TypeSourceInfo *TInfo,
                                    ArrayRef<OffsetOfComponent> Components,
                                    SourceLocation RParenLoc) {
QualType ArgTy = TInfo->getType();
bool Dependent = ArgTy->isDependentType();
SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();

// We must have at least one component that refers to the type, and the first
// one is known to be a field designator.  Verify that the ArgTy represents
// a struct/union/class.
if (!Dependent && !ArgTy->isRecordType())
  return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type) 
                     << ArgTy << TypeRange);

// Type must be complete per C99 7.17p3 because a declaring a variable
// with an incomplete type would be ill-formed.
if (!Dependent 
    && RequireCompleteType(BuiltinLoc, ArgTy,
                           diag::err_offsetof_incomplete_type, TypeRange))
  return ExprError();

bool DidWarnAboutNonPOD = false;
QualType CurrentType = ArgTy;
SmallVector<OffsetOfNode, 4> Comps;
SmallVector<Expr*, 4> Exprs;
for (const OffsetOfComponent &OC : Components) {
  if (OC.isBrackets) {
    // Offset of an array sub-field.  TODO: Should we allow vector elements?
    if (!CurrentType->isDependentType()) {
      const ArrayType *AT = Context.getAsArrayType(CurrentType);
      if(!AT)
        return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
                         << CurrentType);
      CurrentType = AT->getElementType();
    } else
      CurrentType = Context.DependentTy;
    
    ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
    if (IdxRval.isInvalid())
      return ExprError();
    Expr *Idx = IdxRval.get();

    // The expression must be an integral expression.
    // FIXME: An integral constant expression?
    if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
        !Idx->getType()->isIntegerType())
      return ExprError(Diag(Idx->getLocStart(),
                            diag::err_typecheck_subscript_not_integer)
                       << Idx->getSourceRange());

    // Record this array index.
    Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
    Exprs.push_back(Idx);
    continue;
  }
  
  // Offset of a field.
  if (CurrentType->isDependentType()) {
    // We have the offset of a field, but we can't look into the dependent
    // type. Just record the identifier of the field.
    Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
    CurrentType = Context.DependentTy;
    continue;
  }
  
  // We need to have a complete type to look into.
  if (RequireCompleteType(OC.LocStart, CurrentType,
                          diag::err_offsetof_incomplete_type))
    return ExprError();
  
  // Look for the designated field.
  const RecordType *RC = CurrentType->getAs<RecordType>();
  if (!RC) 
    return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
                     << CurrentType);
  RecordDecl *RD = RC->getDecl();
  
  // C++ [lib.support.types]p5:
  //   The macro offsetof accepts a restricted set of type arguments in this
  //   International Standard. type shall be a POD structure or a POD union
  //   (clause 9).
  // C++11 [support.types]p4:
  //   If type is not a standard-layout class (Clause 9), the results are
  //   undefined.
  if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
    bool IsSafe = LangOpts.CPlusPlus11? CRD->isStandardLayout() : CRD->isPOD();
    unsigned DiagID =
      LangOpts.CPlusPlus11? diag::ext_offsetof_non_standardlayout_type
                          : diag::ext_offsetof_non_pod_type;

    if (!IsSafe && !DidWarnAboutNonPOD &&
        DiagRuntimeBehavior(BuiltinLoc, nullptr,
                            PDiag(DiagID)
                            << SourceRange(Components[0].LocStart, OC.LocEnd)
                            << CurrentType))
      DidWarnAboutNonPOD = true;
  }
  
  // Look for the field.
  LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
  LookupQualifiedName(R, RD);
  FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
  IndirectFieldDecl *IndirectMemberDecl = nullptr;
  if (!MemberDecl) {
    if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
      MemberDecl = IndirectMemberDecl->getAnonField();
  }

  if (!MemberDecl)
    return ExprError(Diag(BuiltinLoc, diag::err_no_member)
                     << OC.U.IdentInfo << RD << SourceRange(OC.LocStart, 
                                                            OC.LocEnd));
  
  // C99 7.17p3:
  //   (If the specified member is a bit-field, the behavior is undefined.)
  //
  // We diagnose this as an error.
  if (MemberDecl->isBitField()) {
    Diag(OC.LocEnd, diag::err_offsetof_bitfield)
      << MemberDecl->getDeclName()
      << SourceRange(BuiltinLoc, RParenLoc);
    Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
    return ExprError();
  }

  RecordDecl *Parent = MemberDecl->getParent();
  if (IndirectMemberDecl)
    Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());

  // If the member was found in a base class, introduce OffsetOfNodes for
  // the base class indirections.
  CXXBasePaths Paths;
  if (IsDerivedFrom(OC.LocStart, CurrentType, Context.getTypeDeclType(Parent),
                    Paths)) {
    if (Paths.getDetectedVirtual()) {
      Diag(OC.LocEnd, diag::err_offsetof_field_of_virtual_base)
        << MemberDecl->getDeclName()
        << SourceRange(BuiltinLoc, RParenLoc);
      return ExprError();
    }

    CXXBasePath &Path = Paths.front();
    for (const CXXBasePathElement &B : Path)
      Comps.push_back(OffsetOfNode(B.Base));
  }

  if (IndirectMemberDecl) {
    for (auto *FI : IndirectMemberDecl->chain()) {
      assert(isa<FieldDecl>(FI))(static_cast <bool> (isa<FieldDecl>(FI)) ? void (
0) : __assert_fail ("isa<FieldDecl>(FI)", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12837, __extension__ __PRETTY_FUNCTION__));
      Comps.push_back(OffsetOfNode(OC.LocStart,
                                   cast<FieldDecl>(FI), OC.LocEnd));
    }
  } else
    Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));

  CurrentType = MemberDecl->getType().getNonReferenceType(); 
}

return OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc, TInfo,
                            Comps, Exprs, RParenLoc);
12849}

12851ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
                                    SourceLocation BuiltinLoc,
                                    SourceLocation TypeLoc,
                                    ParsedType ParsedArgTy,
                                    ArrayRef<OffsetOfComponent> Components,
                                    SourceLocation RParenLoc) {

TypeSourceInfo *ArgTInfo;
QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
if (ArgTy.isNull())
  return ExprError();

if (!ArgTInfo)
  ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);

return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, Components, RParenLoc);
12867}


12870ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
                               Expr *CondExpr,
                               Expr *LHSExpr, Expr *RHSExpr,
                               SourceLocation RPLoc) {
assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)")(static_cast <bool> ((CondExpr && LHSExpr &&
 RHSExpr) && "Missing type argument(s)") ? void (0) :
 __assert_fail ("(CondExpr && LHSExpr && RHSExpr) && \"Missing type argument(s)\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12874, __extension__ __PRETTY_FUNCTION__));

ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
QualType resType;
bool ValueDependent = false;
bool CondIsTrue = false;
if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
  resType = Context.DependentTy;
  ValueDependent = true;
} else {
  // The conditional expression is required to be a constant expression.
  llvm::APSInt condEval(32);
  ExprResult CondICE
    = VerifyIntegerConstantExpression(CondExpr, &condEval,
        diag::err_typecheck_choose_expr_requires_constant, false);
  if (CondICE.isInvalid())
    return ExprError();
  CondExpr = CondICE.get();
  CondIsTrue = condEval.getZExtValue();

  // If the condition is > zero, then the AST type is the same as the LSHExpr.
  Expr *ActiveExpr = CondIsTrue ? LHSExpr : RHSExpr;

  resType = ActiveExpr->getType();
  ValueDependent = ActiveExpr->isValueDependent();
  VK = ActiveExpr->getValueKind();
  OK = ActiveExpr->getObjectKind();
}

return new (Context)
    ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, VK, OK, RPLoc,
               CondIsTrue, resType->isDependentType(), ValueDependent);
12907}

12909//===----------------------------------------------------------------------===//
12910// Clang Extensions.
12911//===----------------------------------------------------------------------===//

12913/// ActOnBlockStart - This callback is invoked when a block literal is started.
12914void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);

if (LangOpts.CPlusPlus) {
  Decl *ManglingContextDecl;
  if (MangleNumberingContext *MCtx =
          getCurrentMangleNumberContext(Block->getDeclContext(),
                                        ManglingContextDecl)) {
    unsigned ManglingNumber = MCtx->getManglingNumber(Block);
    Block->setBlockMangling(ManglingNumber, ManglingContextDecl);
  }
}

PushBlockScope(CurScope, Block);
CurContext->addDecl(Block);
if (CurScope)
  PushDeclContext(CurScope, Block);
else
  CurContext = Block;

getCurBlock()->HasImplicitReturnType = true;

// Enter a new evaluation context to insulate the block from any
// cleanups from the enclosing full-expression.
PushExpressionEvaluationContext(
    ExpressionEvaluationContext::PotentiallyEvaluated);
12940}

12942void Sema::ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
                             Scope *CurScope) {
assert(ParamInfo.getIdentifier() == nullptr &&(static_cast <bool> (ParamInfo.getIdentifier() == nullptr
 && "block-id should have no identifier!") ? void (0)
 : __assert_fail ("ParamInfo.getIdentifier() == nullptr && \"block-id should have no identifier!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12945, __extension__ __PRETTY_FUNCTION__))
       "block-id should have no identifier!")(static_cast <bool> (ParamInfo.getIdentifier() == nullptr
 && "block-id should have no identifier!") ? void (0)
 : __assert_fail ("ParamInfo.getIdentifier() == nullptr && \"block-id should have no identifier!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12945, __extension__ __PRETTY_FUNCTION__));
assert(ParamInfo.getContext() == DeclaratorContext::BlockLiteralContext)(static_cast <bool> (ParamInfo.getContext() == DeclaratorContext
::BlockLiteralContext) ? void (0) : __assert_fail ("ParamInfo.getContext() == DeclaratorContext::BlockLiteralContext"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12946, __extension__ __PRETTY_FUNCTION__));
BlockScopeInfo *CurBlock = getCurBlock();

TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
QualType T = Sig->getType();

// FIXME: We should allow unexpanded parameter packs here, but that would,
// in turn, make the block expression contain unexpanded parameter packs.
if (DiagnoseUnexpandedParameterPack(CaretLoc, Sig, UPPC_Block)) {
  // Drop the parameters.
  FunctionProtoType::ExtProtoInfo EPI;
  EPI.HasTrailingReturn = false;
  EPI.TypeQuals |= DeclSpec::TQ_const;
  T = Context.getFunctionType(Context.DependentTy, None, EPI);
  Sig = Context.getTrivialTypeSourceInfo(T);
}

// GetTypeForDeclarator always produces a function type for a block
// literal signature.  Furthermore, it is always a FunctionProtoType
// unless the function was written with a typedef.
assert(T->isFunctionType() &&(static_cast <bool> (T->isFunctionType() && "GetTypeForDeclarator made a non-function block signature"
) ? void (0) : __assert_fail ("T->isFunctionType() && \"GetTypeForDeclarator made a non-function block signature\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12967, __extension__ __PRETTY_FUNCTION__))
       "GetTypeForDeclarator made a non-function block signature")(static_cast <bool> (T->isFunctionType() && "GetTypeForDeclarator made a non-function block signature"
) ? void (0) : __assert_fail ("T->isFunctionType() && \"GetTypeForDeclarator made a non-function block signature\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 12967, __extension__ __PRETTY_FUNCTION__));

// Look for an explicit signature in that function type.
FunctionProtoTypeLoc ExplicitSignature;

if ((ExplicitSignature =
         Sig->getTypeLoc().getAsAdjusted<FunctionProtoTypeLoc>())) {

  // Check whether that explicit signature was synthesized by
  // GetTypeForDeclarator.  If so, don't save that as part of the
  // written signature.
  if (ExplicitSignature.getLocalRangeBegin() ==
      ExplicitSignature.getLocalRangeEnd()) {
    // This would be much cheaper if we stored TypeLocs instead of
    // TypeSourceInfos.
    TypeLoc Result = ExplicitSignature.getReturnLoc();
    unsigned Size = Result.getFullDataSize();
    Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
    Sig->getTypeLoc().initializeFullCopy(Result, Size);

    ExplicitSignature = FunctionProtoTypeLoc();
  }
}

CurBlock->TheDecl->setSignatureAsWritten(Sig);
CurBlock->FunctionType = T;

const FunctionType *Fn = T->getAs<FunctionType>();
QualType RetTy = Fn->getReturnType();
bool isVariadic =
  (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());

CurBlock->TheDecl->setIsVariadic(isVariadic);

// Context.DependentTy is used as a placeholder for a missing block
// return type.  TODO:  what should we do with declarators like:
//   ^ * { ... }
// If the answer is "apply template argument deduction"....
if (RetTy != Context.DependentTy) {
  CurBlock->ReturnType = RetTy;
  CurBlock->TheDecl->setBlockMissingReturnType(false);
  CurBlock->HasImplicitReturnType = false;
}

// Push block parameters from the declarator if we had them.
SmallVector<ParmVarDecl*, 8> Params;
if (ExplicitSignature) {
  for (unsigned I = 0, E = ExplicitSignature.getNumParams(); I != E; ++I) {
    ParmVarDecl *Param = ExplicitSignature.getParam(I);
    if (Param->getIdentifier() == nullptr &&
        !Param->isImplicit() &&
        !Param->isInvalidDecl() &&
        !getLangOpts().CPlusPlus)
      Diag(Param->getLocation(), diag::err_parameter_name_omitted);
    Params.push_back(Param);
  }

// Fake up parameter variables if we have a typedef, like
//   ^ fntype { ... }
} else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
  for (const auto &I : Fn->param_types()) {
    ParmVarDecl *Param = BuildParmVarDeclForTypedef(
        CurBlock->TheDecl, ParamInfo.getLocStart(), I);
    Params.push_back(Param);
  }
}

// Set the parameters on the block decl.
if (!Params.empty()) {
  CurBlock->TheDecl->setParams(Params);
  CheckParmsForFunctionDef(CurBlock->TheDecl->parameters(),
                           /*CheckParameterNames=*/false);
}

// Finally we can process decl attributes.
ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);

// Put the parameter variables in scope.
for (auto AI : CurBlock->TheDecl->parameters()) {
  AI->setOwningFunction(CurBlock->TheDecl);

  // If this has an identifier, add it to the scope stack.
  if (AI->getIdentifier()) {
    CheckShadow(CurBlock->TheScope, AI);

    PushOnScopeChains(AI, CurBlock->TheScope);
  }
}
13055}

13057/// ActOnBlockError - If there is an error parsing a block, this callback
13058/// is invoked to pop the information about the block from the action impl.
13059void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
// Leave the expression-evaluation context.
DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();

// Pop off CurBlock, handle nested blocks.
PopDeclContext();
PopFunctionScopeInfo();
13067}

13069/// ActOnBlockStmtExpr - This is called when the body of a block statement
13070/// literal was successfully completed.  ^(int x){...}
13071ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
                                  Stmt *Body, Scope *CurScope) {
// If blocks are disabled, emit an error.
if (!LangOpts.Blocks)
  Diag(CaretLoc, diag::err_blocks_disable) << LangOpts.OpenCL;

// Leave the expression-evaluation context.
if (hasAnyUnrecoverableErrorsInThisFunction())
  DiscardCleanupsInEvaluationContext();
assert(!Cleanup.exprNeedsCleanups() &&(static_cast <bool> (!Cleanup.exprNeedsCleanups() &&
 "cleanups within block not correctly bound!") ? void (0) : __assert_fail
 ("!Cleanup.exprNeedsCleanups() && \"cleanups within block not correctly bound!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13081, __extension__ __PRETTY_FUNCTION__))
       "cleanups within block not correctly bound!")(static_cast <bool> (!Cleanup.exprNeedsCleanups() &&
 "cleanups within block not correctly bound!") ? void (0) : __assert_fail
 ("!Cleanup.exprNeedsCleanups() && \"cleanups within block not correctly bound!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13081, __extension__ __PRETTY_FUNCTION__));
PopExpressionEvaluationContext();

BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());

if (BSI->HasImplicitReturnType)
  deduceClosureReturnType(*BSI);

PopDeclContext();

QualType RetTy = Context.VoidTy;
if (!BSI->ReturnType.isNull())
  RetTy = BSI->ReturnType;

bool NoReturn = BSI->TheDecl->hasAttr<NoReturnAttr>();
QualType BlockTy;

// Set the captured variables on the block.
// FIXME: Share capture structure between BlockDecl and CapturingScopeInfo!
SmallVector<BlockDecl::Capture, 4> Captures;
for (Capture &Cap : BSI->Captures) {
  if (Cap.isThisCapture())
    continue;
  BlockDecl::Capture NewCap(Cap.getVariable(), Cap.isBlockCapture(),
                            Cap.isNested(), Cap.getInitExpr());
  Captures.push_back(NewCap);
}
BSI->TheDecl->setCaptures(Context, Captures, BSI->CXXThisCaptureIndex != 0);

// If the user wrote a function type in some form, try to use that.
if (!BSI->FunctionType.isNull()) {
  const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();

  FunctionType::ExtInfo Ext = FTy->getExtInfo();
  if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
  
  // Turn protoless block types into nullary block types.
  if (isa<FunctionNoProtoType>(FTy)) {
    FunctionProtoType::ExtProtoInfo EPI;
    EPI.ExtInfo = Ext;
    BlockTy = Context.getFunctionType(RetTy, None, EPI);

  // Otherwise, if we don't need to change anything about the function type,
  // preserve its sugar structure.
  } else if (FTy->getReturnType() == RetTy &&
             (!NoReturn || FTy->getNoReturnAttr())) {
    BlockTy = BSI->FunctionType;

  // Otherwise, make the minimal modifications to the function type.
  } else {
    const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
    FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
    EPI.TypeQuals = 0; // FIXME: silently?
    EPI.ExtInfo = Ext;
    BlockTy = Context.getFunctionType(RetTy, FPT->getParamTypes(), EPI);
  }

// If we don't have a function type, just build one from nothing.
} else {
  FunctionProtoType::ExtProtoInfo EPI;
  EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
  BlockTy = Context.getFunctionType(RetTy, None, EPI);
}

DiagnoseUnusedParameters(BSI->TheDecl->parameters());
BlockTy = Context.getBlockPointerType(BlockTy);

// If needed, diagnose invalid gotos and switches in the block.
if (getCurFunction()->NeedsScopeChecking() &&
    !PP.isCodeCompletionEnabled())
  DiagnoseInvalidJumps(cast<CompoundStmt>(Body));

BSI->TheDecl->setBody(cast<CompoundStmt>(Body));

if (Body && getCurFunction()->HasPotentialAvailabilityViolations)
  DiagnoseUnguardedAvailabilityViolations(BSI->TheDecl);

// Try to apply the named return value optimization. We have to check again
// if we can do this, though, because blocks keep return statements around
// to deduce an implicit return type.
if (getLangOpts().CPlusPlus && RetTy->isRecordType() &&
    !BSI->TheDecl->isDependentContext())
  computeNRVO(Body, BSI);

BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy);
AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
PopFunctionScopeInfo(&WP, Result->getBlockDecl(), Result);

// If the block isn't obviously global, i.e. it captures anything at
// all, then we need to do a few things in the surrounding context:
if (Result->getBlockDecl()->hasCaptures()) {
  // First, this expression has a new cleanup object.
  ExprCleanupObjects.push_back(Result->getBlockDecl());
  Cleanup.setExprNeedsCleanups(true);

  // It also gets a branch-protected scope if any of the captured
  // variables needs destruction.
  for (const auto &CI : Result->getBlockDecl()->captures()) {
    const VarDecl *var = CI.getVariable();
    if (var->getType().isDestructedType() != QualType::DK_none) {
      setFunctionHasBranchProtectedScope();
      break;
    }
  }
}

return Result;
13188}

13190ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
                          SourceLocation RPLoc) {
TypeSourceInfo *TInfo;
GetTypeFromParser(Ty, &TInfo);
return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
13195}

13197ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
                              Expr *E, TypeSourceInfo *TInfo,
                              SourceLocation RPLoc) {
Expr *OrigExpr = E;
bool IsMS = false;

// CUDA device code does not support varargs.
if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) {
  if (const FunctionDecl *F = dyn_cast<FunctionDecl>(CurContext)) {
    CUDAFunctionTarget T = IdentifyCUDATarget(F);
    if (T == CFT_Global || T == CFT_Device || T == CFT_HostDevice)
      return ExprError(Diag(E->getLocStart(), diag::err_va_arg_in_device));
  }
}

// It might be a __builtin_ms_va_list. (But don't ever mark a va_arg()
// as Microsoft ABI on an actual Microsoft platform, where
// __builtin_ms_va_list and __builtin_va_list are the same.)
if (!E->isTypeDependent() && Context.getTargetInfo().hasBuiltinMSVaList() &&
    Context.getTargetInfo().getBuiltinVaListKind() != TargetInfo::CharPtrBuiltinVaList) {
  QualType MSVaListType = Context.getBuiltinMSVaListType();
  if (Context.hasSameType(MSVaListType, E->getType())) {
    if (CheckForModifiableLvalue(E, BuiltinLoc, *this))
      return ExprError();
    IsMS = true;
  }
}

// Get the va_list type
QualType VaListType = Context.getBuiltinVaListType();
if (!IsMS) {
  if (VaListType->isArrayType()) {
    // Deal with implicit array decay; for example, on x86-64,
    // va_list is an array, but it's supposed to decay to
    // a pointer for va_arg.
    VaListType = Context.getArrayDecayedType(VaListType);
    // Make sure the input expression also decays appropriately.
    ExprResult Result = UsualUnaryConversions(E);
    if (Result.isInvalid())
      return ExprError();
    E = Result.get();
  } else if (VaListType->isRecordType() && getLangOpts().CPlusPlus) {
    // If va_list is a record type and we are compiling in C++ mode,
    // check the argument using reference binding.
    InitializedEntity Entity = InitializedEntity::InitializeParameter(
        Context, Context.getLValueReferenceType(VaListType), false);
    ExprResult Init = PerformCopyInitialization(Entity, SourceLocation(), E);
    if (Init.isInvalid())
      return ExprError();
    E = Init.getAs<Expr>();
  } else {
    // Otherwise, the va_list argument must be an l-value because
    // it is modified by va_arg.
    if (!E->isTypeDependent() &&
        CheckForModifiableLvalue(E, BuiltinLoc, *this))
      return ExprError();
  }
}

if (!IsMS && !E->isTypeDependent() &&
    !Context.hasSameType(VaListType, E->getType()))
  return ExprError(Diag(E->getLocStart(),
                       diag::err_first_argument_to_va_arg_not_of_type_va_list)
    << OrigExpr->getType() << E->getSourceRange());

if (!TInfo->getType()->isDependentType()) {
  if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
                          diag::err_second_parameter_to_va_arg_incomplete,
                          TInfo->getTypeLoc()))
    return ExprError();

  if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
                             TInfo->getType(),
                             diag::err_second_parameter_to_va_arg_abstract,
                             TInfo->getTypeLoc()))
    return ExprError();

  if (!TInfo->getType().isPODType(Context)) {
    Diag(TInfo->getTypeLoc().getBeginLoc(),
         TInfo->getType()->isObjCLifetimeType()
           ? diag::warn_second_parameter_to_va_arg_ownership_qualified
           : diag::warn_second_parameter_to_va_arg_not_pod)
      << TInfo->getType()
      << TInfo->getTypeLoc().getSourceRange();
  }

  // Check for va_arg where arguments of the given type will be promoted
  // (i.e. this va_arg is guaranteed to have undefined behavior).
  QualType PromoteType;
  if (TInfo->getType()->isPromotableIntegerType()) {
    PromoteType = Context.getPromotedIntegerType(TInfo->getType());
    if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
      PromoteType = QualType();
  }
  if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
    PromoteType = Context.DoubleTy;
  if (!PromoteType.isNull())
    DiagRuntimeBehavior(TInfo->getTypeLoc().getBeginLoc(), E,
                PDiag(diag::warn_second_parameter_to_va_arg_never_compatible)
                        << TInfo->getType()
                        << PromoteType
                        << TInfo->getTypeLoc().getSourceRange());
}

QualType T = TInfo->getType().getNonLValueExprType(Context);
return new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T, IsMS);
13303}

13305ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
// The type of __null will be int or long, depending on the size of
// pointers on the target.
QualType Ty;
unsigned pw = Context.getTargetInfo().getPointerWidth(0);
if (pw == Context.getTargetInfo().getIntWidth())
  Ty = Context.IntTy;
else if (pw == Context.getTargetInfo().getLongWidth())
  Ty = Context.LongTy;
else if (pw == Context.getTargetInfo().getLongLongWidth())
  Ty = Context.LongLongTy;
else {
  llvm_unreachable("I don't know size of pointer!")::llvm::llvm_unreachable_internal("I don't know size of pointer!"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13317);
}

return new (Context) GNUNullExpr(Ty, TokenLoc);
13321}

13323bool Sema::ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&Exp,
                                            bool Diagnose) {
if (!getLangOpts().ObjC1)
  return false;

const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
if (!PT)
  return false;

if (!PT->isObjCIdType()) {
  // Check if the destination is the 'NSString' interface.
  const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
  if (!ID || !ID->getIdentifier()->isStr("NSString"))
    return false;
}

// Ignore any parens, implicit casts (should only be
// array-to-pointer decays), and not-so-opaque values.  The last is
// important for making this trigger for property assignments.
Expr *SrcExpr = Exp->IgnoreParenImpCasts();
if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
  if (OV->getSourceExpr())
    SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();

StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
if (!SL || !SL->isAscii())
  return false;
if (Diagnose) {
  Diag(SL->getLocStart(), diag::err_missing_atsign_prefix)
    << FixItHint::CreateInsertion(SL->getLocStart(), "@");
  Exp = BuildObjCStringLiteral(SL->getLocStart(), SL).get();
}
return true;
13356}

13358static bool maybeDiagnoseAssignmentToFunction(Sema &S, QualType DstType,
                                            const Expr *SrcExpr) {
if (!DstType->isFunctionPointerType() ||
    !SrcExpr->getType()->isFunctionType())
  return false;

auto *DRE = dyn_cast<DeclRefExpr>(SrcExpr->IgnoreParenImpCasts());
if (!DRE)
  return false;

auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
if (!FD)
  return false;

return !S.checkAddressOfFunctionIsAvailable(FD,
                                            /*Complain=*/true,
                                            SrcExpr->getLocStart());
13375}

13377bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
                                  SourceLocation Loc,
                                  QualType DstType, QualType SrcType,
                                  Expr *SrcExpr, AssignmentAction Action,
                                  bool *Complained) {
if (Complained)
  *Complained = false;

// Decode the result (notice that AST's are still created for extensions).
bool CheckInferredResultType = false;
bool isInvalid = false;
unsigned DiagKind = 0;
FixItHint Hint;
ConversionFixItGenerator ConvHints;
bool MayHaveConvFixit = false;
bool MayHaveFunctionDiff = false;
const ObjCInterfaceDecl *IFace = nullptr;
const ObjCProtocolDecl *PDecl = nullptr;

switch (ConvTy) {
case Compatible:
    DiagnoseAssignmentEnum(DstType, SrcType, SrcExpr);
    return false;

case PointerToInt:
  DiagKind = diag::ext_typecheck_convert_pointer_int;
  ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
  MayHaveConvFixit = true;
  break;
case IntToPointer:
  DiagKind = diag::ext_typecheck_convert_int_pointer;
  ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
  MayHaveConvFixit = true;
  break;
case IncompatiblePointer:
  if (Action == AA_Passing_CFAudited)
    DiagKind = diag::err_arc_typecheck_convert_incompatible_pointer;
  else if (SrcType->isFunctionPointerType() &&
           DstType->isFunctionPointerType())
    DiagKind = diag::ext_typecheck_convert_incompatible_function_pointer;
  else
    DiagKind = diag::ext_typecheck_convert_incompatible_pointer;

  CheckInferredResultType = DstType->isObjCObjectPointerType() &&
    SrcType->isObjCObjectPointerType();
  if (Hint.isNull() && !CheckInferredResultType) {
    ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
  }
  else if (CheckInferredResultType) {
    SrcType = SrcType.getUnqualifiedType();
    DstType = DstType.getUnqualifiedType();
  }
  MayHaveConvFixit = true;
  break;
case IncompatiblePointerSign:
  DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
  break;
case FunctionVoidPointer:
  DiagKind = diag::ext_typecheck_convert_pointer_void_func;
  break;
case IncompatiblePointerDiscardsQualifiers: {
  // Perform array-to-pointer decay if necessary.
  if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);

  Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
  Qualifiers rhq = DstType->getPointeeType().getQualifiers();
  if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
    DiagKind = diag::err_typecheck_incompatible_address_space;
    break;


  } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
    DiagKind = diag::err_typecheck_incompatible_ownership;
    break;
  }

  llvm_unreachable("unknown error case for discarding qualifiers!")::llvm::llvm_unreachable_internal("unknown error case for discarding qualifiers!"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13453);
  // fallthrough
}
case CompatiblePointerDiscardsQualifiers:
  // If the qualifiers lost were because we were applying the
  // (deprecated) C++ conversion from a string literal to a char*
  // (or wchar_t*), then there was no error (C++ 4.2p2).  FIXME:
  // Ideally, this check would be performed in
  // checkPointerTypesForAssignment. However, that would require a
  // bit of refactoring (so that the second argument is an
  // expression, rather than a type), which should be done as part
  // of a larger effort to fix checkPointerTypesForAssignment for
  // C++ semantics.
  if (getLangOpts().CPlusPlus &&
      IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
    return false;
  DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
  break;
case IncompatibleNestedPointerQualifiers:
  DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
  break;
case IntToBlockPointer:
  DiagKind = diag::err_int_to_block_pointer;
  break;
case IncompatibleBlockPointer:
  DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
  break;
case IncompatibleObjCQualifiedId: {
  if (SrcType->isObjCQualifiedIdType()) {
    const ObjCObjectPointerType *srcOPT =
              SrcType->getAs<ObjCObjectPointerType>();
    for (auto *srcProto : srcOPT->quals()) {
      PDecl = srcProto;
      break;
    }
    if (const ObjCInterfaceType *IFaceT =
          DstType->getAs<ObjCObjectPointerType>()->getInterfaceType())
      IFace = IFaceT->getDecl();
  }
  else if (DstType->isObjCQualifiedIdType()) {
    const ObjCObjectPointerType *dstOPT =
      DstType->getAs<ObjCObjectPointerType>();
    for (auto *dstProto : dstOPT->quals()) {
      PDecl = dstProto;
      break;
    }
    if (const ObjCInterfaceType *IFaceT =
          SrcType->getAs<ObjCObjectPointerType>()->getInterfaceType())
      IFace = IFaceT->getDecl();
  }
  DiagKind = diag::warn_incompatible_qualified_id;
  break;
}
case IncompatibleVectors:
  DiagKind = diag::warn_incompatible_vectors;
  break;
case IncompatibleObjCWeakRef:
  DiagKind = diag::err_arc_weak_unavailable_assign;
  break;
case Incompatible:
  if (maybeDiagnoseAssignmentToFunction(*this, DstType, SrcExpr)) {
    if (Complained)
      *Complained = true;
    return true;
  }

  DiagKind = diag::err_typecheck_convert_incompatible;
  ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
  MayHaveConvFixit = true;
  isInvalid = true;
  MayHaveFunctionDiff = true;
  break;
}

QualType FirstType, SecondType;
switch (Action) {
case AA_Assigning:
case AA_Initializing:
  // The destination type comes first.
  FirstType = DstType;
  SecondType = SrcType;
  break;

case AA_Returning:
case AA_Passing:
case AA_Passing_CFAudited:
case AA_Converting:
case AA_Sending:
case AA_Casting:
  // The source type comes first.
  FirstType = SrcType;
  SecondType = DstType;
  break;
}

PartialDiagnostic FDiag = PDiag(DiagKind);
if (Action == AA_Passing_CFAudited)
  FDiag << FirstType << SecondType << AA_Passing << SrcExpr->getSourceRange();
else
  FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();

// If we can fix the conversion, suggest the FixIts.
assert(ConvHints.isNull() || Hint.isNull())(static_cast <bool> (ConvHints.isNull() || Hint.isNull(
)) ? void (0) : __assert_fail ("ConvHints.isNull() || Hint.isNull()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13555, __extension__ __PRETTY_FUNCTION__));
if (!ConvHints.isNull()) {
  for (FixItHint &H : ConvHints.Hints)
    FDiag << H;
} else {
  FDiag << Hint;
}
if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }

if (MayHaveFunctionDiff)
  HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);

Diag(Loc, FDiag);
if (DiagKind == diag::warn_incompatible_qualified_id &&
    PDecl && IFace && !IFace->hasDefinition())
    Diag(IFace->getLocation(), diag::note_incomplete_class_and_qualified_id)
      << IFace << PDecl;
  
if (SecondType == Context.OverloadTy)
  NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
                            FirstType, /*TakingAddress=*/true);

if (CheckInferredResultType)
  EmitRelatedResultTypeNote(SrcExpr);

if (Action == AA_Returning && ConvTy == IncompatiblePointer)
  EmitRelatedResultTypeNoteForReturn(DstType);

if (Complained)
  *Complained = true;
return isInvalid;
13586}

13588ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
                                               llvm::APSInt *Result) {
class SimpleICEDiagnoser : public VerifyICEDiagnoser {
public:
  void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
    S.Diag(Loc, diag::err_expr_not_ice) << S.LangOpts.CPlusPlus << SR;
  }
} Diagnoser;

return VerifyIntegerConstantExpression(E, Result, Diagnoser);
13598}

13600ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
                                               llvm::APSInt *Result,
                                               unsigned DiagID,
                                               bool AllowFold) {
class IDDiagnoser : public VerifyICEDiagnoser {
  unsigned DiagID;
  
public:
  IDDiagnoser(unsigned DiagID)
    : VerifyICEDiagnoser(DiagID == 0), DiagID(DiagID) { }
  
  void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
    S.Diag(Loc, DiagID) << SR;
  }
} Diagnoser(DiagID);

return VerifyIntegerConstantExpression(E, Result, Diagnoser, AllowFold);
13617}

13619void Sema::VerifyICEDiagnoser::diagnoseFold(Sema &S, SourceLocation Loc,
                                          SourceRange SR) {
S.Diag(Loc, diag::ext_expr_not_ice) << SR << S.LangOpts.CPlusPlus;
13622}

13624ExprResult
13625Sema::VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                    VerifyICEDiagnoser &Diagnoser,
                                    bool AllowFold) {
SourceLocation DiagLoc = E->getLocStart();

if (getLangOpts().CPlusPlus11) {
  // C++11 [expr.const]p5:
  //   If an expression of literal class type is used in a context where an
  //   integral constant expression is required, then that class type shall
  //   have a single non-explicit conversion function to an integral or
  //   unscoped enumeration type
  ExprResult Converted;
  class CXX11ConvertDiagnoser : public ICEConvertDiagnoser {
  public:
    CXX11ConvertDiagnoser(bool Silent)
        : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false,
                              Silent, true) {}

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

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

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

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

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

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

    SemaDiagnosticBuilder diagnoseConversion(
        Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
      llvm_unreachable("conversion functions are permitted")::llvm::llvm_unreachable_internal("conversion functions are permitted"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13677);
    }
  } ConvertDiagnoser(Diagnoser.Suppress);

  Converted = PerformContextualImplicitConversion(DiagLoc, E,
                                                  ConvertDiagnoser);
  if (Converted.isInvalid())
    return Converted;
  E = Converted.get();
  if (!E->getType()->isIntegralOrUnscopedEnumerationType())
    return ExprError();
} else if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
  // An ICE must be of integral or unscoped enumeration type.
  if (!Diagnoser.Suppress)
    Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
  return ExprError();
}

// Circumvent ICE checking in C++11 to avoid evaluating the expression twice
// in the non-ICE case.
if (!getLangOpts().CPlusPlus11 && E->isIntegerConstantExpr(Context)) {
  if (Result)
    *Result = E->EvaluateKnownConstInt(Context);
  return E;
}

Expr::EvalResult EvalResult;
SmallVector<PartialDiagnosticAt, 8> Notes;
EvalResult.Diag = &Notes;

// Try to evaluate the expression, and produce diagnostics explaining why it's
// not a constant expression as a side-effect.
bool Folded = E->EvaluateAsRValue(EvalResult, Context) &&
              EvalResult.Val.isInt() && !EvalResult.HasSideEffects;

// In C++11, we can rely on diagnostics being produced for any expression
// which is not a constant expression. If no diagnostics were produced, then
// this is a constant expression.
if (Folded && getLangOpts().CPlusPlus11 && Notes.empty()) {
  if (Result)
    *Result = EvalResult.Val.getInt();
  return E;
}

// If our only note is the usual "invalid subexpression" note, just point
// the caret at its location rather than producing an essentially
// redundant note.
if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
      diag::note_invalid_subexpr_in_const_expr) {
  DiagLoc = Notes[0].first;
  Notes.clear();
}

if (!Folded || !AllowFold) {
  if (!Diagnoser.Suppress) {
    Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
    for (const PartialDiagnosticAt &Note : Notes)
      Diag(Note.first, Note.second);
  }

  return ExprError();
}

Diagnoser.diagnoseFold(*this, DiagLoc, E->getSourceRange());
for (const PartialDiagnosticAt &Note : Notes)
  Diag(Note.first, Note.second);

if (Result)
  *Result = EvalResult.Val.getInt();
return E;
13747}

13749namespace {
// Handle the case where we conclude a expression which we speculatively
// considered to be unevaluated is actually evaluated.
class TransformToPE : public TreeTransform<TransformToPE> {
  typedef TreeTransform<TransformToPE> BaseTransform;

public:
  TransformToPE(Sema &SemaRef) : BaseTransform(SemaRef) { }

  // Make sure we redo semantic analysis
  bool AlwaysRebuild() { return true; }

  // Make sure we handle LabelStmts correctly.
  // FIXME: This does the right thing, but maybe we need a more general
  // fix to TreeTransform?
  StmtResult TransformLabelStmt(LabelStmt *S) {
    S->getDecl()->setStmt(nullptr);
    return BaseTransform::TransformLabelStmt(S);
  }

  // We need to special-case DeclRefExprs referring to FieldDecls which
  // are not part of a member pointer formation; normal TreeTransforming
  // doesn't catch this case because of the way we represent them in the AST.
  // FIXME: This is a bit ugly; is it really the best way to handle this
  // case?
  //
  // Error on DeclRefExprs referring to FieldDecls.
  ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
    if (isa<FieldDecl>(E->getDecl()) &&
        !SemaRef.isUnevaluatedContext())
      return SemaRef.Diag(E->getLocation(),
                          diag::err_invalid_non_static_member_use)
          << E->getDecl() << E->getSourceRange();

    return BaseTransform::TransformDeclRefExpr(E);
  }

  // Exception: filter out member pointer formation
  ExprResult TransformUnaryOperator(UnaryOperator *E) {
    if (E->getOpcode() == UO_AddrOf && E->getType()->isMemberPointerType())
      return E;

    return BaseTransform::TransformUnaryOperator(E);
  }

  ExprResult TransformLambdaExpr(LambdaExpr *E) {
    // Lambdas never need to be transformed.
    return E;
  }
};
13799}

13801ExprResult Sema::TransformToPotentiallyEvaluated(Expr *E) {
assert(isUnevaluatedContext() &&(static_cast <bool> (isUnevaluatedContext() && "Should only transform unevaluated expressions"
) ? void (0) : __assert_fail ("isUnevaluatedContext() && \"Should only transform unevaluated expressions\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13803, __extension__ __PRETTY_FUNCTION__))
       "Should only transform unevaluated expressions")(static_cast <bool> (isUnevaluatedContext() && "Should only transform unevaluated expressions"
) ? void (0) : __assert_fail ("isUnevaluatedContext() && \"Should only transform unevaluated expressions\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13803, __extension__ __PRETTY_FUNCTION__));
ExprEvalContexts.back().Context =
    ExprEvalContexts[ExprEvalContexts.size()-2].Context;
if (isUnevaluatedContext())
  return E;
return TransformToPE(*this).TransformExpr(E);
13809}

13811void
13812Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                    Decl *LambdaContextDecl,
                                    bool IsDecltype) {
ExprEvalContexts.emplace_back(NewContext, ExprCleanupObjects.size(), Cleanup,
                              LambdaContextDecl, IsDecltype);
Cleanup.reset();
if (!MaybeODRUseExprs.empty())
  std::swap(MaybeODRUseExprs, ExprEvalContexts.back().SavedMaybeODRUseExprs);
13820}

13822void
13823Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                    ReuseLambdaContextDecl_t,
                                    bool IsDecltype) {
Decl *ClosureContextDecl = ExprEvalContexts.back().ManglingContextDecl;
PushExpressionEvaluationContext(NewContext, ClosureContextDecl, IsDecltype);
13828}

13830void Sema::PopExpressionEvaluationContext() {
ExpressionEvaluationContextRecord& Rec = ExprEvalContexts.back();
unsigned NumTypos = Rec.NumTypos;

if (!Rec.Lambdas.empty()) {
  if (Rec.isUnevaluated() || Rec.isConstantEvaluated()) {
    unsigned D;
    if (Rec.isUnevaluated()) {
      // C++11 [expr.prim.lambda]p2:
      //   A lambda-expression shall not appear in an unevaluated operand
      //   (Clause 5).
      D = diag::err_lambda_unevaluated_operand;
    } else {
      // C++1y [expr.const]p2:
      //   A conditional-expression e is a core constant expression unless the
      //   evaluation of e, following the rules of the abstract machine, would
      //   evaluate [...] a lambda-expression.
      D = diag::err_lambda_in_constant_expression;
    }

    // C++1z allows lambda expressions as core constant expressions.
    // FIXME: In C++1z, reinstate the restrictions on lambda expressions (CWG
    // 1607) from appearing within template-arguments and array-bounds that
    // are part of function-signatures.  Be mindful that P0315 (Lambdas in
    // unevaluated contexts) might lift some of these restrictions in a 
    // future version.
    if (!Rec.isConstantEvaluated() || !getLangOpts().CPlusPlus17)
      for (const auto *L : Rec.Lambdas)
        Diag(L->getLocStart(), D);
  } else {
    // Mark the capture expressions odr-used. This was deferred
    // during lambda expression creation.
    for (auto *Lambda : Rec.Lambdas) {
      for (auto *C : Lambda->capture_inits())
        MarkDeclarationsReferencedInExpr(C);
    }
  }
}

// When are coming out of an unevaluated context, clear out any
// temporaries that we may have created as part of the evaluation of
// the expression in that context: they aren't relevant because they
// will never be constructed.
if (Rec.isUnevaluated() || Rec.isConstantEvaluated()) {
  ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
                           ExprCleanupObjects.end());
  Cleanup = Rec.ParentCleanup;
  CleanupVarDeclMarking();
  std::swap(MaybeODRUseExprs, Rec.SavedMaybeODRUseExprs);
// Otherwise, merge the contexts together.
} else {
  Cleanup.mergeFrom(Rec.ParentCleanup);
  MaybeODRUseExprs.insert(Rec.SavedMaybeODRUseExprs.begin(),
                          Rec.SavedMaybeODRUseExprs.end());
}

// Pop the current expression evaluation context off the stack.
ExprEvalContexts.pop_back();

if (!ExprEvalContexts.empty())
  ExprEvalContexts.back().NumTypos += NumTypos;
else
  assert(NumTypos == 0 && "There are outstanding typos after popping the "(static_cast <bool> (NumTypos == 0 && "There are outstanding typos after popping the "
 "last ExpressionEvaluationContextRecord") ? void (0) : __assert_fail
 ("NumTypos == 0 && \"There are outstanding typos after popping the \" \"last ExpressionEvaluationContextRecord\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13893, __extension__ __PRETTY_FUNCTION__))
                          "last ExpressionEvaluationContextRecord")(static_cast <bool> (NumTypos == 0 && "There are outstanding typos after popping the "
 "last ExpressionEvaluationContextRecord") ? void (0) : __assert_fail
 ("NumTypos == 0 && \"There are outstanding typos after popping the \" \"last ExpressionEvaluationContextRecord\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13893, __extension__ __PRETTY_FUNCTION__));
13894}

13896void Sema::DiscardCleanupsInEvaluationContext() {
ExprCleanupObjects.erase(
       ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
       ExprCleanupObjects.end());
Cleanup.reset();
MaybeODRUseExprs.clear();
13902}

13904ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
if (!E->getType()->isVariablyModifiedType())
  return E;
return TransformToPotentiallyEvaluated(E);
13908}

13910/// Are we within a context in which some evaluation could be performed (be it
13911/// constant evaluation or runtime evaluation)? Sadly, this notion is not quite
13912/// captured by C++'s idea of an "unevaluated context".
13913static bool isEvaluatableContext(Sema &SemaRef) {
switch (SemaRef.ExprEvalContexts.back().Context) {
  case Sema::ExpressionEvaluationContext::Unevaluated:
  case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
  case Sema::ExpressionEvaluationContext::DiscardedStatement:
    // Expressions in this context are never evaluated.
    return false;

  case Sema::ExpressionEvaluationContext::UnevaluatedList:
  case Sema::ExpressionEvaluationContext::ConstantEvaluated:
  case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
    // Expressions in this context could be evaluated.
    return true;

  case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
    // Referenced declarations will only be used if the construct in the
    // containing expression is used, at which point we'll be given another
    // turn to mark them.
    return false;
}
llvm_unreachable("Invalid context")::llvm::llvm_unreachable_internal("Invalid context", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13933);
13934}

13936/// Are we within a context in which references to resolved functions or to
13937/// variables result in odr-use?
13938static bool isOdrUseContext(Sema &SemaRef, bool SkipDependentUses = true) {
// An expression in a template is not really an expression until it's been
// instantiated, so it doesn't trigger odr-use.
if (SkipDependentUses && SemaRef.CurContext->isDependentContext())
  return false;

switch (SemaRef.ExprEvalContexts.back().Context) {
  case Sema::ExpressionEvaluationContext::Unevaluated:
  case Sema::ExpressionEvaluationContext::UnevaluatedList:
  case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
  case Sema::ExpressionEvaluationContext::DiscardedStatement:
    return false;

  case Sema::ExpressionEvaluationContext::ConstantEvaluated:
  case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
    return true;

  case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
    return false;
}
llvm_unreachable("Invalid context")::llvm::llvm_unreachable_internal("Invalid context", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13958);
13959}

13961static bool isImplicitlyDefinableConstexprFunction(FunctionDecl *Func) {
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Func);
return Func->isConstexpr() &&
       (Func->isImplicitlyInstantiable() || (MD && !MD->isUserProvided()));
13965}

13967/// \brief Mark a function referenced, and check whether it is odr-used
13968/// (C++ [basic.def.odr]p2, C99 6.9p3)
13969void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
                                bool MightBeOdrUse) {
assert(Func && "No function?")(static_cast <bool> (Func && "No function?") ? void
 (0) : __assert_fail ("Func && \"No function?\"", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 13971, __extension__ __PRETTY_FUNCTION__));

Func->setReferenced();

// C++11 [basic.def.odr]p3:
//   A function whose name appears as a potentially-evaluated expression is
//   odr-used if it is the unique lookup result or the selected member of a
//   set of overloaded functions [...].
//
// We (incorrectly) mark overload resolution as an unevaluated context, so we
// can just check that here.
bool OdrUse = MightBeOdrUse && isOdrUseContext(*this);

// Determine whether we require a function definition to exist, per
// C++11 [temp.inst]p3:
//   Unless a function template specialization has been explicitly
//   instantiated or explicitly specialized, the function template
//   specialization is implicitly instantiated when the specialization is
//   referenced in a context that requires a function definition to exist.
//
// That is either when this is an odr-use, or when a usage of a constexpr
// function occurs within an evaluatable context.
bool NeedDefinition =
    OdrUse || (isEvaluatableContext(*this) &&
               isImplicitlyDefinableConstexprFunction(Func));

// C++14 [temp.expl.spec]p6:
//   If a template [...] is explicitly specialized then that specialization
//   shall be declared before the first use of that specialization that would
//   cause an implicit instantiation to take place, in every translation unit
//   in which such a use occurs
if (NeedDefinition &&
    (Func->getTemplateSpecializationKind() != TSK_Undeclared ||
     Func->getMemberSpecializationInfo()))
  checkSpecializationVisibility(Loc, Func);

// C++14 [except.spec]p17:
//   An exception-specification is considered to be needed when:
//   - the function is odr-used or, if it appears in an unevaluated operand,
//     would be odr-used if the expression were potentially-evaluated;
//
// Note, we do this even if MightBeOdrUse is false. That indicates that the
// function is a pure virtual function we're calling, and in that case the
// function was selected by overload resolution and we need to resolve its
// exception specification for a different reason.
const FunctionProtoType *FPT = Func->getType()->getAs<FunctionProtoType>();
if (FPT && isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
  ResolveExceptionSpec(Loc, FPT);

// If we don't need to mark the function as used, and we don't need to
// try to provide a definition, there's nothing more to do.
if ((Func->isUsed(/*CheckUsedAttr=*/false) || !OdrUse) &&
    (!NeedDefinition || Func->getBody()))
  return;

// Note that this declaration has been used.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Func)) {
  Constructor = cast<CXXConstructorDecl>(Constructor->getFirstDecl());
  if (Constructor->isDefaulted() && !Constructor->isDeleted()) {
    if (Constructor->isDefaultConstructor()) {
      if (Constructor->isTrivial() && !Constructor->hasAttr<DLLExportAttr>())
        return;
      DefineImplicitDefaultConstructor(Loc, Constructor);
    } else if (Constructor->isCopyConstructor()) {
      DefineImplicitCopyConstructor(Loc, Constructor);
    } else if (Constructor->isMoveConstructor()) {
      DefineImplicitMoveConstructor(Loc, Constructor);
    }
  } else if (Constructor->getInheritedConstructor()) {
    DefineInheritingConstructor(Loc, Constructor);
  }
} else if (CXXDestructorDecl *Destructor =
               dyn_cast<CXXDestructorDecl>(Func)) {
  Destructor = cast<CXXDestructorDecl>(Destructor->getFirstDecl());
  if (Destructor->isDefaulted() && !Destructor->isDeleted()) {
    if (Destructor->isTrivial() && !Destructor->hasAttr<DLLExportAttr>())
      return;
    DefineImplicitDestructor(Loc, Destructor);
  }
  if (Destructor->isVirtual() && getLangOpts().AppleKext)
    MarkVTableUsed(Loc, Destructor->getParent());
} else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(Func)) {
  if (MethodDecl->isOverloadedOperator() &&
      MethodDecl->getOverloadedOperator() == OO_Equal) {
    MethodDecl = cast<CXXMethodDecl>(MethodDecl->getFirstDecl());
    if (MethodDecl->isDefaulted() && !MethodDecl->isDeleted()) {
      if (MethodDecl->isCopyAssignmentOperator())
        DefineImplicitCopyAssignment(Loc, MethodDecl);
      else if (MethodDecl->isMoveAssignmentOperator())
        DefineImplicitMoveAssignment(Loc, MethodDecl);
    }
  } else if (isa<CXXConversionDecl>(MethodDecl) &&
             MethodDecl->getParent()->isLambda()) {
    CXXConversionDecl *Conversion =
        cast<CXXConversionDecl>(MethodDecl->getFirstDecl());
    if (Conversion->isLambdaToBlockPointerConversion())
      DefineImplicitLambdaToBlockPointerConversion(Loc, Conversion);
    else
      DefineImplicitLambdaToFunctionPointerConversion(Loc, Conversion);
  } else if (MethodDecl->isVirtual() && getLangOpts().AppleKext)
    MarkVTableUsed(Loc, MethodDecl->getParent());
}

// Recursive functions should be marked when used from another function.
// FIXME: Is this really right?
if (CurContext == Func) return;

// Implicit instantiation of function templates and member functions of
// class templates.
if (Func->isImplicitlyInstantiable()) {
  TemplateSpecializationKind TSK = Func->getTemplateSpecializationKind();
  SourceLocation PointOfInstantiation = Func->getPointOfInstantiation();
  bool FirstInstantiation = PointOfInstantiation.isInvalid();
  if (FirstInstantiation) {
    PointOfInstantiation = Loc;
    Func->setTemplateSpecializationKind(TSK, PointOfInstantiation);
  } else if (TSK != TSK_ImplicitInstantiation) {
    // Use the point of use as the point of instantiation, instead of the
    // point of explicit instantiation (which we track as the actual point of
    // instantiation). This gives better backtraces in diagnostics.
    PointOfInstantiation = Loc;
  }

  if (FirstInstantiation || TSK != TSK_ImplicitInstantiation ||
      Func->isConstexpr()) {
    if (isa<CXXRecordDecl>(Func->getDeclContext()) &&
        cast<CXXRecordDecl>(Func->getDeclContext())->isLocalClass() &&
        CodeSynthesisContexts.size())
      PendingLocalImplicitInstantiations.push_back(
          std::make_pair(Func, PointOfInstantiation));
    else if (Func->isConstexpr())
      // Do not defer instantiations of constexpr functions, to avoid the
      // expression evaluator needing to call back into Sema if it sees a
      // call to such a function.
      InstantiateFunctionDefinition(PointOfInstantiation, Func);
    else {
      Func->setInstantiationIsPending(true);
      PendingInstantiations.push_back(std::make_pair(Func,
                                                     PointOfInstantiation));
      // Notify the consumer that a function was implicitly instantiated.
      Consumer.HandleCXXImplicitFunctionInstantiation(Func);
    }
  }
} else {
  // Walk redefinitions, as some of them may be instantiable.
  for (auto i : Func->redecls()) {
    if (!i->isUsed(false) && i->isImplicitlyInstantiable())
      MarkFunctionReferenced(Loc, i, OdrUse);
  }
}

if (!OdrUse) return;

// Keep track of used but undefined functions.
if (!Func->isDefined()) {
  if (mightHaveNonExternalLinkage(Func))
    UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
  else if (Func->getMostRecentDecl()->isInlined() &&
           !LangOpts.GNUInline &&
           !Func->getMostRecentDecl()->hasAttr<GNUInlineAttr>())
    UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
  else if (isExternalWithNoLinkageType(Func))
    UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
}

Func->markUsed(Context);
14137}

14139static void
14140diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
                                 ValueDecl *var, DeclContext *DC) {
DeclContext *VarDC = var->getDeclContext();

//  If the parameter still belongs to the translation unit, then
//  we're actually just using one parameter in the declaration of
//  the next.
if (isa<ParmVarDecl>(var) &&
    isa<TranslationUnitDecl>(VarDC))
  return;

// For C code, don't diagnose about capture if we're not actually in code
// right now; it's impossible to write a non-constant expression outside of
// function context, so we'll get other (more useful) diagnostics later.
//
// For C++, things get a bit more nasty... it would be nice to suppress this
// diagnostic for certain cases like using a local variable in an array bound
// for a member of a local class, but the correct predicate is not obvious.
if (!S.getLangOpts().CPlusPlus && !S.CurContext->isFunctionOrMethod())
  return;

unsigned ValueKind = isa<BindingDecl>(var) ? 1 : 0;
unsigned ContextKind = 3; // unknown
if (isa<CXXMethodDecl>(VarDC) &&
    cast<CXXRecordDecl>(VarDC->getParent())->isLambda()) {
  ContextKind = 2;
} else if (isa<FunctionDecl>(VarDC)) {
  ContextKind = 0;
} else if (isa<BlockDecl>(VarDC)) {
  ContextKind = 1;
}

S.Diag(loc, diag::err_reference_to_local_in_enclosing_context)
  << var << ValueKind << ContextKind << VarDC;
S.Diag(var->getLocation(), diag::note_entity_declared_at)
    << var;

// FIXME: Add additional diagnostic info about class etc. which prevents
// capture.
14179}


14182static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var, 
                                    bool &SubCapturesAreNested,
                                    QualType &CaptureType, 
                                    QualType &DeclRefType) {
 // Check whether we've already captured it.
if (CSI->CaptureMap.count(Var)) {
  // If we found a capture, any subcaptures are nested.
  SubCapturesAreNested = true;
    
  // Retrieve the capture type for this variable.
  CaptureType = CSI->getCapture(Var).getCaptureType();
    
  // Compute the type of an expression that refers to this variable.
  DeclRefType = CaptureType.getNonReferenceType();

  // Similarly to mutable captures in lambda, all the OpenMP captures by copy
  // are mutable in the sense that user can change their value - they are
  // private instances of the captured declarations.
  const Capture &Cap = CSI->getCapture(Var);
  if (Cap.isCopyCapture() &&
      !(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable) &&
      !(isa<CapturedRegionScopeInfo>(CSI) &&
        cast<CapturedRegionScopeInfo>(CSI)->CapRegionKind == CR_OpenMP))
    DeclRefType.addConst();
  return true;
}
return false;
14209}

14211// Only block literals, captured statements, and lambda expressions can
14212// capture; other scopes don't work.
14213static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var, 
                               SourceLocation Loc, 
                               const bool Diagnose, Sema &S) {
if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC) || isLambdaCallOperator(DC))
  return getLambdaAwareParentOfDeclContext(DC);
else if (Var->hasLocalStorage()) {
  if (Diagnose)
     diagnoseUncapturableValueReference(S, Loc, Var, DC);
}
return nullptr;
14223}

14225// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture 
14226// certain types of variables (unnamed, variably modified types etc.)
14227// so check for eligibility.
14228static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var, 
                               SourceLocation Loc, 
                               const bool Diagnose, Sema &S) {

bool IsBlock = isa<BlockScopeInfo>(CSI);
bool IsLambda = isa<LambdaScopeInfo>(CSI);

// Lambdas are not allowed to capture unnamed variables
// (e.g. anonymous unions).
// FIXME: The C++11 rule don't actually state this explicitly, but I'm
// assuming that's the intent.
if (IsLambda && !Var->getDeclName()) {
  if (Diagnose) {
    S.Diag(Loc, diag::err_lambda_capture_anonymous_var);
    S.Diag(Var->getLocation(), diag::note_declared_at);
  }
  return false;
}

// Prohibit variably-modified types in blocks; they're difficult to deal with.
if (Var->getType()->isVariablyModifiedType() && IsBlock) {
  if (Diagnose) {
    S.Diag(Loc, diag::err_ref_vm_type);
    S.Diag(Var->getLocation(), diag::note_previous_decl) 
      << Var->getDeclName();
  }
  return false;
}
// Prohibit structs with flexible array members too.
// We cannot capture what is in the tail end of the struct.
if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
  if (VTTy->getDecl()->hasFlexibleArrayMember()) {
    if (Diagnose) {
      if (IsBlock)
        S.Diag(Loc, diag::err_ref_flexarray_type);
      else
        S.Diag(Loc, diag::err_lambda_capture_flexarray_type)
          << Var->getDeclName();
      S.Diag(Var->getLocation(), diag::note_previous_decl)
        << Var->getDeclName();
    }
    return false;
  }
}
const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
// Lambdas and captured statements are not allowed to capture __block
// variables; they don't support the expected semantics.
if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
  if (Diagnose) {
    S.Diag(Loc, diag::err_capture_block_variable)
      << Var->getDeclName() << !IsLambda;
    S.Diag(Var->getLocation(), diag::note_previous_decl)
      << Var->getDeclName();
  }
  return false;
}
// OpenCL v2.0 s6.12.5: Blocks cannot reference/capture other blocks
if (S.getLangOpts().OpenCL && IsBlock &&
    Var->getType()->isBlockPointerType()) {
  if (Diagnose)
    S.Diag(Loc, diag::err_opencl_block_ref_block);
  return false;
}

return true;
14293}

14295// Returns true if the capture by block was successful.
14296static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var, 
                               SourceLocation Loc, 
                               const bool BuildAndDiagnose, 
                               QualType &CaptureType,
                               QualType &DeclRefType, 
                               const bool Nested,
                               Sema &S) {
Expr *CopyExpr = nullptr;
bool ByRef = false;
    
// Blocks are not allowed to capture arrays.
if (CaptureType->isArrayType()) {
  if (BuildAndDiagnose) {
    S.Diag(Loc, diag::err_ref_array_type);
    S.Diag(Var->getLocation(), diag::note_previous_decl) 
    << Var->getDeclName();
  }
  return false;
}

// Forbid the block-capture of autoreleasing variables.
if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
  if (BuildAndDiagnose) {
    S.Diag(Loc, diag::err_arc_autoreleasing_capture)
      << /*block*/ 0;
    S.Diag(Var->getLocation(), diag::note_previous_decl)
      << Var->getDeclName();
  }
  return false;
}

// Warn about implicitly autoreleasing indirect parameters captured by blocks.
if (const auto *PT = CaptureType->getAs<PointerType>()) {
  // This function finds out whether there is an AttributedType of kind
  // attr_objc_ownership in Ty. The existence of AttributedType of kind
  // attr_objc_ownership implies __autoreleasing was explicitly specified
  // rather than being added implicitly by the compiler.
  auto IsObjCOwnershipAttributedType = [](QualType Ty) {
    while (const auto *AttrTy = Ty->getAs<AttributedType>()) {
      if (AttrTy->getAttrKind() == AttributedType::attr_objc_ownership)
        return true;

      // Peel off AttributedTypes that are not of kind objc_ownership.
      Ty = AttrTy->getModifiedType();
    }

    return false;
  };

  QualType PointeeTy = PT->getPointeeType();

  if (PointeeTy->getAs<ObjCObjectPointerType>() &&
      PointeeTy.getObjCLifetime() == Qualifiers::OCL_Autoreleasing &&
      !IsObjCOwnershipAttributedType(PointeeTy)) {
    if (BuildAndDiagnose) {
      SourceLocation VarLoc = Var->getLocation();
      S.Diag(Loc, diag::warn_block_capture_autoreleasing);
      {
        auto AddAutoreleaseNote =
            S.Diag(VarLoc, diag::note_declare_parameter_autoreleasing);
        // Provide a fix-it for the '__autoreleasing' keyword at the
        // appropriate location in the variable's type.
        if (const auto *TSI = Var->getTypeSourceInfo()) {
          PointerTypeLoc PTL =
              TSI->getTypeLoc().getAsAdjusted<PointerTypeLoc>();
          if (PTL) {
            SourceLocation Loc = PTL.getPointeeLoc().getEndLoc();
            Loc = Lexer::getLocForEndOfToken(Loc, 0, S.getSourceManager(),
                                             S.getLangOpts());
            if (Loc.isValid()) {
              StringRef CharAtLoc = Lexer::getSourceText(
                  CharSourceRange::getCharRange(Loc, Loc.getLocWithOffset(1)),
                  S.getSourceManager(), S.getLangOpts());
              AddAutoreleaseNote << FixItHint::CreateInsertion(
                  Loc, CharAtLoc.empty() || !isWhitespace(CharAtLoc[0])
                           ? " __autoreleasing "
                           : " __autoreleasing");
            }
          }
        }
      }
      S.Diag(VarLoc, diag::note_declare_parameter_strong);
    }
  }
}

const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
if (HasBlocksAttr || CaptureType->isReferenceType() ||
    (S.getLangOpts().OpenMP && S.IsOpenMPCapturedDecl(Var))) {
  // Block capture by reference does not change the capture or
  // declaration reference types.
  ByRef = true;
} else {
  // Block capture by copy introduces 'const'.
  CaptureType = CaptureType.getNonReferenceType().withConst();
  DeclRefType = CaptureType;
              
  if (S.getLangOpts().CPlusPlus && BuildAndDiagnose) {
    if (const RecordType *Record = DeclRefType->getAs<RecordType>()) {
      // The capture logic needs the destructor, so make sure we mark it.
      // Usually this is unnecessary because most local variables have
      // their destructors marked at declaration time, but parameters are
      // an exception because it's technically only the call site that
      // actually requires the destructor.
      if (isa<ParmVarDecl>(Var))
        S.FinalizeVarWithDestructor(Var, Record);

      // Enter a new evaluation context to insulate the copy
      // full-expression.
      EnterExpressionEvaluationContext scope(
          S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);

      // According to the blocks spec, the capture of a variable from
      // the stack requires a const copy constructor.  This is not true
      // of the copy/move done to move a __block variable to the heap.
      Expr *DeclRef = new (S.Context) DeclRefExpr(Var, Nested,
                                                DeclRefType.withConst(), 
                                                VK_LValue, Loc);
          
      ExprResult Result
        = S.PerformCopyInitialization(
            InitializedEntity::InitializeBlock(Var->getLocation(),
                                                CaptureType, false),
            Loc, DeclRef);
          
      // Build a full-expression copy expression if initialization
      // succeeded and used a non-trivial constructor.  Recover from
      // errors by pretending that the copy isn't necessary.
      if (!Result.isInvalid() &&
          !cast<CXXConstructExpr>(Result.get())->getConstructor()
              ->isTrivial()) {
        Result = S.MaybeCreateExprWithCleanups(Result);
        CopyExpr = Result.get();
      }
    }
  }
}

// Actually capture the variable.
if (BuildAndDiagnose)
  BSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc, 
                  SourceLocation(), CaptureType, CopyExpr);

return true;

14441}


14444/// \brief Capture the given variable in the captured region.
14445static bool captureInCapturedRegion(CapturedRegionScopeInfo *RSI,
                                  VarDecl *Var, 
                                  SourceLocation Loc, 
                                  const bool BuildAndDiagnose, 
                                  QualType &CaptureType,
                                  QualType &DeclRefType, 
                                  const bool RefersToCapturedVariable,
                                  Sema &S) {
// By default, capture variables by reference.
bool ByRef = true;
// Using an LValue reference type is consistent with Lambdas (see below).
if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP) {
  if (S.IsOpenMPCapturedDecl(Var)) {
    bool HasConst = DeclRefType.isConstQualified();
    DeclRefType = DeclRefType.getUnqualifiedType();
    // Don't lose diagnostics about assignments to const.
    if (HasConst)
      DeclRefType.addConst();
  }
  ByRef = S.IsOpenMPCapturedByRef(Var, RSI->OpenMPLevel);
}

if (ByRef)
  CaptureType = S.Context.getLValueReferenceType(DeclRefType);
else
  CaptureType = DeclRefType;

Expr *CopyExpr = nullptr;
if (BuildAndDiagnose) {
  // The current implementation assumes that all variables are captured
  // by references. Since there is no capture by copy, no expression
  // evaluation will be needed.
  RecordDecl *RD = RSI->TheRecordDecl;

  FieldDecl *Field
    = FieldDecl::Create(S.Context, RD, Loc, Loc, nullptr, CaptureType,
                        S.Context.getTrivialTypeSourceInfo(CaptureType, Loc),
                        nullptr, false, ICIS_NoInit);
  Field->setImplicit(true);
  Field->setAccess(AS_private);
  RD->addDecl(Field);
  if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP)
    S.setOpenMPCaptureKind(Field, Var, RSI->OpenMPLevel);

  CopyExpr = new (S.Context) DeclRefExpr(Var, RefersToCapturedVariable,
                                          DeclRefType, VK_LValue, Loc);
  Var->setReferenced(true);
  Var->markUsed(S.Context);
}

// Actually capture the variable.
if (BuildAndDiagnose)
  RSI->addCapture(Var, /*isBlock*/false, ByRef, RefersToCapturedVariable, Loc,
                  SourceLocation(), CaptureType, CopyExpr);


return true;
14502}

14504/// \brief Create a field within the lambda class for the variable
14505/// being captured.
14506static void addAsFieldToClosureType(Sema &S, LambdaScopeInfo *LSI, 
                                  QualType FieldType, QualType DeclRefType,
                                  SourceLocation Loc,
                                  bool RefersToCapturedVariable) {
CXXRecordDecl *Lambda = LSI->Lambda;

// Build the non-static data member.
FieldDecl *Field
  = FieldDecl::Create(S.Context, Lambda, Loc, Loc, nullptr, FieldType,
                      S.Context.getTrivialTypeSourceInfo(FieldType, Loc),
                      nullptr, false, ICIS_NoInit);
Field->setImplicit(true);
Field->setAccess(AS_private);
Lambda->addDecl(Field);
14520}

14522/// \brief Capture the given variable in the lambda.
14523static bool captureInLambda(LambdaScopeInfo *LSI,
                          VarDecl *Var, 
                          SourceLocation Loc, 
                          const bool BuildAndDiagnose, 
                          QualType &CaptureType,
                          QualType &DeclRefType, 
                          const bool RefersToCapturedVariable,
                          const Sema::TryCaptureKind Kind, 
                          SourceLocation EllipsisLoc,
                          const bool IsTopScope,
                          Sema &S) {

// Determine whether we are capturing by reference or by value.
bool ByRef = false;
if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
  ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
} else {
  ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
}
  
// Compute the type of the field that will capture this variable.
if (ByRef) {
  // C++11 [expr.prim.lambda]p15:
  //   An entity is captured by reference if it is implicitly or
  //   explicitly captured but not captured by copy. It is
  //   unspecified whether additional unnamed non-static data
  //   members are declared in the closure type for entities
  //   captured by reference.
  //
  // FIXME: It is not clear whether we want to build an lvalue reference
  // to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
  // to do the former, while EDG does the latter. Core issue 1249 will 
  // clarify, but for now we follow GCC because it's a more permissive and
  // easily defensible position.
  CaptureType = S.Context.getLValueReferenceType(DeclRefType);
} else {
  // C++11 [expr.prim.lambda]p14:
  //   For each entity captured by copy, an unnamed non-static
  //   data member is declared in the closure type. The
  //   declaration order of these members is unspecified. The type
  //   of such a data member is the type of the corresponding
  //   captured entity if the entity is not a reference to an
  //   object, or the referenced type otherwise. [Note: If the
  //   captured entity is a reference to a function, the
  //   corresponding data member is also a reference to a
  //   function. - end note ]
  if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
    if (!RefType->getPointeeType()->isFunctionType())
      CaptureType = RefType->getPointeeType();
  }

  // Forbid the lambda copy-capture of autoreleasing variables.
  if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
    if (BuildAndDiagnose) {
      S.Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
      S.Diag(Var->getLocation(), diag::note_previous_decl)
        << Var->getDeclName();
    }
    return false;
  }

  // Make sure that by-copy captures are of a complete and non-abstract type.
  if (BuildAndDiagnose) {
    if (!CaptureType->isDependentType() &&
        S.RequireCompleteType(Loc, CaptureType,
                              diag::err_capture_of_incomplete_type,
                              Var->getDeclName()))
      return false;

    if (S.RequireNonAbstractType(Loc, CaptureType,
                                 diag::err_capture_of_abstract_type))
      return false;
  }
}

// Capture this variable in the lambda.
if (BuildAndDiagnose)
  addAsFieldToClosureType(S, LSI, CaptureType, DeclRefType, Loc,
                          RefersToCapturedVariable);
  
// Compute the type of a reference to this captured variable.
if (ByRef)
  DeclRefType = CaptureType.getNonReferenceType();
else {
  // C++ [expr.prim.lambda]p5:
  //   The closure type for a lambda-expression has a public inline 
  //   function call operator [...]. This function call operator is 
  //   declared const (9.3.1) if and only if the lambda-expression's 
  //   parameter-declaration-clause is not followed by mutable.
  DeclRefType = CaptureType.getNonReferenceType();
  if (!LSI->Mutable && !CaptureType->isReferenceType())
    DeclRefType.addConst();      
}
  
// Add the capture.
if (BuildAndDiagnose)
  LSI->addCapture(Var, /*IsBlock=*/false, ByRef, RefersToCapturedVariable, 
                  Loc, EllipsisLoc, CaptureType, /*CopyExpr=*/nullptr);
    
return true;
14623}

14625bool Sema::tryCaptureVariable(
  VarDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
  SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType,
  QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt) {
// An init-capture is notionally from the context surrounding its
// declaration, but its parent DC is the lambda class.
DeclContext *VarDC = Var->getDeclContext();
if (Var->isInitCapture())
  VarDC = VarDC->getParent();

DeclContext *DC = CurContext;
const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt 
    ? *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;  
// We need to sync up the Declaration Context with the
// FunctionScopeIndexToStopAt
if (FunctionScopeIndexToStopAt) {
  unsigned FSIndex = FunctionScopes.size() - 1;
  while (FSIndex != MaxFunctionScopesIndex) {
    DC = getLambdaAwareParentOfDeclContext(DC);
    --FSIndex;
  }
}


// If the variable is declared in the current context, there is no need to
// capture it.
if (VarDC == DC) return true;

// Capture global variables if it is required to use private copy of this
// variable.
bool IsGlobal = !Var->hasLocalStorage();
if (IsGlobal && !(LangOpts.OpenMP && IsOpenMPCapturedDecl(Var)))
  return true;
Var = Var->getCanonicalDecl();

// Walk up the stack to determine whether we can capture the variable,
// performing the "simple" checks that don't depend on type. We stop when
// we've either hit the declared scope of the variable or find an existing
// capture of that variable.  We start from the innermost capturing-entity
// (the DC) and ensure that all intervening capturing-entities 
// (blocks/lambdas etc.) between the innermost capturer and the variable`s
// declcontext can either capture the variable or have already captured
// the variable.
CaptureType = Var->getType();
DeclRefType = CaptureType.getNonReferenceType();
bool Nested = false;
bool Explicit = (Kind != TryCapture_Implicit);
unsigned FunctionScopesIndex = MaxFunctionScopesIndex;
do {
  // Only block literals, captured statements, and lambda expressions can
  // capture; other scopes don't work.
  DeclContext *ParentDC = getParentOfCapturingContextOrNull(DC, Var, 
                                                            ExprLoc, 
                                                            BuildAndDiagnose,
                                                            *this);
  // We need to check for the parent *first* because, if we *have*
  // private-captured a global variable, we need to recursively capture it in
  // intermediate blocks, lambdas, etc.
  if (!ParentDC) {
    if (IsGlobal) {
      FunctionScopesIndex = MaxFunctionScopesIndex - 1;
      break;
    }
    return true;
  }

  FunctionScopeInfo  *FSI = FunctionScopes[FunctionScopesIndex];
  CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FSI);


  // Check whether we've already captured it.
  if (isVariableAlreadyCapturedInScopeInfo(CSI, Var, Nested, CaptureType, 
                                           DeclRefType)) {
    CSI->getCapture(Var).markUsed(BuildAndDiagnose);
    break;
  }
  // If we are instantiating a generic lambda call operator body, 
  // we do not want to capture new variables.  What was captured
  // during either a lambdas transformation or initial parsing
  // should be used. 
  if (isGenericLambdaCallOperatorSpecialization(DC)) {
    if (BuildAndDiagnose) {
      LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);   
      if (LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None) {
        Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
        Diag(Var->getLocation(), diag::note_previous_decl) 
           << Var->getDeclName();
        Diag(LSI->Lambda->getLocStart(), diag::note_lambda_decl);          
      } else
        diagnoseUncapturableValueReference(*this, ExprLoc, Var, DC);
    }
    return true;
  }
  // Certain capturing entities (lambdas, blocks etc.) are not allowed to capture 
  // certain types of variables (unnamed, variably modified types etc.)
  // so check for eligibility.
  if (!isVariableCapturable(CSI, Var, ExprLoc, BuildAndDiagnose, *this))
     return true;

  // Try to capture variable-length arrays types.
  if (Var->getType()->isVariablyModifiedType()) {
    // We're going to walk down into the type and look for VLA
    // expressions.
    QualType QTy = Var->getType();
    if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
      QTy = PVD->getOriginalType();
    captureVariablyModifiedType(Context, QTy, CSI);
  }

  if (getLangOpts().OpenMP) {
    if (auto *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
      // OpenMP private variables should not be captured in outer scope, so
      // just break here. Similarly, global variables that are captured in a
      // target region should not be captured outside the scope of the region.
      if (RSI->CapRegionKind == CR_OpenMP) {
        bool IsOpenMPPrivateDecl = isOpenMPPrivateDecl(Var, RSI->OpenMPLevel);
        auto IsTargetCap = !IsOpenMPPrivateDecl &&
                           isOpenMPTargetCapturedDecl(Var, RSI->OpenMPLevel);
        // When we detect target captures we are looking from inside the
        // target region, therefore we need to propagate the capture from the
        // enclosing region. Therefore, the capture is not initially nested.
        if (IsTargetCap)
          adjustOpenMPTargetScopeIndex(FunctionScopesIndex, RSI->OpenMPLevel);

        if (IsTargetCap || IsOpenMPPrivateDecl) {
          Nested = !IsTargetCap;
          DeclRefType = DeclRefType.getUnqualifiedType();
          CaptureType = Context.getLValueReferenceType(DeclRefType);
          break;
        }
      }
    }
  }
  if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
    // No capture-default, and this is not an explicit capture 
    // so cannot capture this variable.  
    if (BuildAndDiagnose) {
      Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
      Diag(Var->getLocation(), diag::note_previous_decl) 
        << Var->getDeclName();
      if (cast<LambdaScopeInfo>(CSI)->Lambda)
        Diag(cast<LambdaScopeInfo>(CSI)->Lambda->getLocStart(),
             diag::note_lambda_decl);
      // FIXME: If we error out because an outer lambda can not implicitly
      // capture a variable that an inner lambda explicitly captures, we
      // should have the inner lambda do the explicit capture - because
      // it makes for cleaner diagnostics later.  This would purely be done
      // so that the diagnostic does not misleadingly claim that a variable 
      // can not be captured by a lambda implicitly even though it is captured 
      // explicitly.  Suggestion:
      //  - create const bool VariableCaptureWasInitiallyExplicit = Explicit 
      //    at the function head
      //  - cache the StartingDeclContext - this must be a lambda 
      //  - captureInLambda in the innermost lambda the variable.
    }
    return true;
  }

  FunctionScopesIndex--;
  DC = ParentDC;
  Explicit = false;
} while (!VarDC->Equals(DC));

// Walk back down the scope stack, (e.g. from outer lambda to inner lambda)
// computing the type of the capture at each step, checking type-specific 
// requirements, and adding captures if requested. 
// If the variable had already been captured previously, we start capturing 
// at the lambda nested within that one.   
for (unsigned I = ++FunctionScopesIndex, N = MaxFunctionScopesIndex + 1; I != N; 
     ++I) {
  CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
  
  if (BlockScopeInfo *BSI = dyn_cast<BlockScopeInfo>(CSI)) {
    if (!captureInBlock(BSI, Var, ExprLoc, 
                        BuildAndDiagnose, CaptureType, 
                        DeclRefType, Nested, *this))
      return true;
    Nested = true;
  } else if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
    if (!captureInCapturedRegion(RSI, Var, ExprLoc, 
                                 BuildAndDiagnose, CaptureType, 
                                 DeclRefType, Nested, *this))
      return true;
    Nested = true;
  } else {
    LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
    if (!captureInLambda(LSI, Var, ExprLoc, 
                         BuildAndDiagnose, CaptureType, 
                         DeclRefType, Nested, Kind, EllipsisLoc, 
                          /*IsTopScope*/I == N - 1, *this))
      return true;
    Nested = true;
  }
}
return false;
14820}

14822bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
                            TryCaptureKind Kind, SourceLocation EllipsisLoc) {  
QualType CaptureType;
QualType DeclRefType;
return tryCaptureVariable(Var, Loc, Kind, EllipsisLoc,
                          /*BuildAndDiagnose=*/true, CaptureType,
                          DeclRefType, nullptr);
14829}

14831bool Sema::NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc) {
QualType CaptureType;
QualType DeclRefType;
return !tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
                           /*BuildAndDiagnose=*/false, CaptureType,
                           DeclRefType, nullptr);
14837}

14839QualType Sema::getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc) {
QualType CaptureType;
QualType DeclRefType;

// Determine whether we can capture this variable.
if (tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
                       /*BuildAndDiagnose=*/false, CaptureType, 
                       DeclRefType, nullptr))
  return QualType();

return DeclRefType;
14850}



14854// If either the type of the variable or the initializer is dependent, 
14855// return false. Otherwise, determine whether the variable is a constant
14856// expression. Use this if you need to know if a variable that might or
14857// might not be dependent is truly a constant expression.
14858static inline bool IsVariableNonDependentAndAConstantExpression(VarDecl *Var, 
  ASTContext &Context) {

if (Var->getType()->isDependentType()) 
  return false;
const VarDecl *DefVD = nullptr;
Var->getAnyInitializer(DefVD);
if (!DefVD) 
  return false;
EvaluatedStmt *Eval = DefVD->ensureEvaluatedStmt();
Expr *Init = cast<Expr>(Eval->Value);
if (Init->isValueDependent()) 
  return false;
return IsVariableAConstantExpression(Var, Context); 
14872}


14875void Sema::UpdateMarkingForLValueToRValue(Expr *E) {
// Per C++11 [basic.def.odr], a variable is odr-used "unless it is 
// an object that satisfies the requirements for appearing in a
// constant expression (5.19) and the lvalue-to-rvalue conversion (4.1)
// is immediately applied."  This function handles the lvalue-to-rvalue
// conversion part.
MaybeODRUseExprs.erase(E->IgnoreParens());

// If we are in a lambda, check if this DeclRefExpr or MemberExpr refers
// to a variable that is a constant expression, and if so, identify it as
// a reference to a variable that does not involve an odr-use of that 
// variable. 
if (LambdaScopeInfo *LSI = getCurLambda()) {
  Expr *SansParensExpr = E->IgnoreParens();
  VarDecl *Var = nullptr;
  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SansParensExpr)) 
    Var = dyn_cast<VarDecl>(DRE->getFoundDecl());
  else if (MemberExpr *ME = dyn_cast<MemberExpr>(SansParensExpr))
    Var = dyn_cast<VarDecl>(ME->getMemberDecl());
  
  if (Var && IsVariableNonDependentAndAConstantExpression(Var, Context)) 
    LSI->markVariableExprAsNonODRUsed(SansParensExpr);    
}
14898}

14900ExprResult Sema::ActOnConstantExpression(ExprResult Res) {
Res = CorrectDelayedTyposInExpr(Res);

if (!Res.isUsable())
  return Res;

// If a constant-expression is a reference to a variable where we delay
// deciding whether it is an odr-use, just assume we will apply the
// lvalue-to-rvalue conversion.  In the one case where this doesn't happen
// (a non-type template argument), we have special handling anyway.
UpdateMarkingForLValueToRValue(Res.get());
return Res;
14912}

14914void Sema::CleanupVarDeclMarking() {
for (Expr *E : MaybeODRUseExprs) {
  VarDecl *Var;
  SourceLocation Loc;
  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
    Var = cast<VarDecl>(DRE->getDecl());
    Loc = DRE->getLocation();
  } else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
    Var = cast<VarDecl>(ME->getMemberDecl());
    Loc = ME->getMemberLoc();
  } else {
    llvm_unreachable("Unexpected expression")::llvm::llvm_unreachable_internal("Unexpected expression", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 14925);
  }

  MarkVarDeclODRUsed(Var, Loc, *this,
                     /*MaxFunctionScopeIndex Pointer*/ nullptr);
}

MaybeODRUseExprs.clear();
14933}


14936static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
                                  VarDecl *Var, Expr *E) {
assert((!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E)) &&(static_cast <bool> ((!E || isa<DeclRefExpr>(E) ||
 isa<MemberExpr>(E)) && "Invalid Expr argument to DoMarkVarDeclReferenced"
) ? void (0) : __assert_fail ("(!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E)) && \"Invalid Expr argument to DoMarkVarDeclReferenced\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 14939, __extension__ __PRETTY_FUNCTION__))
       "Invalid Expr argument to DoMarkVarDeclReferenced")(static_cast <bool> ((!E || isa<DeclRefExpr>(E) ||
 isa<MemberExpr>(E)) && "Invalid Expr argument to DoMarkVarDeclReferenced"
) ? void (0) : __assert_fail ("(!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E)) && \"Invalid Expr argument to DoMarkVarDeclReferenced\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 14939, __extension__ __PRETTY_FUNCTION__));
Var->setReferenced();

TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();

bool OdrUseContext = isOdrUseContext(SemaRef);
bool UsableInConstantExpr =
    Var->isUsableInConstantExpressions(SemaRef.Context);
bool NeedDefinition =
    OdrUseContext || (isEvaluatableContext(SemaRef) && UsableInConstantExpr);

VarTemplateSpecializationDecl *VarSpec =
    dyn_cast<VarTemplateSpecializationDecl>(Var);
assert(!isa<VarTemplatePartialSpecializationDecl>(Var) &&(static_cast <bool> (!isa<VarTemplatePartialSpecializationDecl
>(Var) && "Can't instantiate a partial template specialization."
) ? void (0) : __assert_fail ("!isa<VarTemplatePartialSpecializationDecl>(Var) && \"Can't instantiate a partial template specialization.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 14953, __extension__ __PRETTY_FUNCTION__))
       "Can't instantiate a partial template specialization.")(static_cast <bool> (!isa<VarTemplatePartialSpecializationDecl
>(Var) && "Can't instantiate a partial template specialization."
) ? void (0) : __assert_fail ("!isa<VarTemplatePartialSpecializationDecl>(Var) && \"Can't instantiate a partial template specialization.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 14953, __extension__ __PRETTY_FUNCTION__));

// If this might be a member specialization of a static data member, check
// the specialization is visible. We already did the checks for variable
// template specializations when we created them.
if (NeedDefinition && TSK != TSK_Undeclared &&
    !isa<VarTemplateSpecializationDecl>(Var))
  SemaRef.checkSpecializationVisibility(Loc, Var);

// Perform implicit instantiation of static data members, static data member
// templates of class templates, and variable template specializations. Delay
// instantiations of variable templates, except for those that could be used
// in a constant expression.
if (NeedDefinition && isTemplateInstantiation(TSK)) {
  // Per C++17 [temp.explicit]p10, we may instantiate despite an explicit
  // instantiation declaration if a variable is usable in a constant
  // expression (among other cases).
  bool TryInstantiating =
      TSK == TSK_ImplicitInstantiation ||
      (TSK == TSK_ExplicitInstantiationDeclaration && UsableInConstantExpr);

  if (TryInstantiating) {
    SourceLocation PointOfInstantiation = Var->getPointOfInstantiation();
    bool FirstInstantiation = PointOfInstantiation.isInvalid();
    if (FirstInstantiation) {
      PointOfInstantiation = Loc;
      Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
    }

    bool InstantiationDependent = false;
    bool IsNonDependent =
        VarSpec ? !TemplateSpecializationType::anyDependentTemplateArguments(
                      VarSpec->getTemplateArgsInfo(), InstantiationDependent)
                : true;

    // Do not instantiate specializations that are still type-dependent.
    if (IsNonDependent) {
      if (UsableInConstantExpr) {
        // Do not defer instantiations of variables that could be used in a
        // constant expression.
        SemaRef.InstantiateVariableDefinition(PointOfInstantiation, Var);
      } else if (FirstInstantiation ||
                 isa<VarTemplateSpecializationDecl>(Var)) {
        // FIXME: For a specialization of a variable template, we don't
        // distinguish between "declaration and type implicitly instantiated"
        // and "implicit instantiation of definition requested", so we have
        // no direct way to avoid enqueueing the pending instantiation
        // multiple times.
        SemaRef.PendingInstantiations
            .push_back(std::make_pair(Var, PointOfInstantiation));
      }
    }
  }
}

// Per C++11 [basic.def.odr], a variable is odr-used "unless it satisfies
// the requirements for appearing in a constant expression (5.19) and, if
// it is an object, the lvalue-to-rvalue conversion (4.1)
// is immediately applied."  We check the first part here, and
// Sema::UpdateMarkingForLValueToRValue deals with the second part.
// Note that we use the C++11 definition everywhere because nothing in
// C++03 depends on whether we get the C++03 version correct. The second
// part does not apply to references, since they are not objects.
if (OdrUseContext && E &&
    IsVariableAConstantExpression(Var, SemaRef.Context)) {
  // A reference initialized by a constant expression can never be
  // odr-used, so simply ignore it.
  if (!Var->getType()->isReferenceType() ||
      (SemaRef.LangOpts.OpenMP && SemaRef.IsOpenMPCapturedDecl(Var)))
    SemaRef.MaybeODRUseExprs.insert(E);
} else if (OdrUseContext) {
  MarkVarDeclODRUsed(Var, Loc, SemaRef,
                     /*MaxFunctionScopeIndex ptr*/ nullptr);
} else if (isOdrUseContext(SemaRef, /*SkipDependentUses*/false)) {
  // If this is a dependent context, we don't need to mark variables as
  // odr-used, but we may still need to track them for lambda capture.
  // FIXME: Do we also need to do this inside dependent typeid expressions
  // (which are modeled as unevaluated at this point)?
  const bool RefersToEnclosingScope =
      (SemaRef.CurContext != Var->getDeclContext() &&
       Var->getDeclContext()->isFunctionOrMethod() && Var->hasLocalStorage());
  if (RefersToEnclosingScope) {
    LambdaScopeInfo *const LSI =
        SemaRef.getCurLambda(/*IgnoreNonLambdaCapturingScope=*/true);
    if (LSI && (!LSI->CallOperator ||
                !LSI->CallOperator->Encloses(Var->getDeclContext()))) {
      // If a variable could potentially be odr-used, defer marking it so
      // until we finish analyzing the full expression for any
      // lvalue-to-rvalue
      // or discarded value conversions that would obviate odr-use.
      // Add it to the list of potential captures that will be analyzed
      // later (ActOnFinishFullExpr) for eventual capture and odr-use marking
      // unless the variable is a reference that was initialized by a constant
      // expression (this will never need to be captured or odr-used).
      assert(E && "Capture variable should be used in an expression.")(static_cast <bool> (E && "Capture variable should be used in an expression."
) ? void (0) : __assert_fail ("E && \"Capture variable should be used in an expression.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15047, __extension__ __PRETTY_FUNCTION__));
      if (!Var->getType()->isReferenceType() ||
          !IsVariableNonDependentAndAConstantExpression(Var, SemaRef.Context))
        LSI->addPotentialCapture(E->IgnoreParens());
    }
  }
}
15054}

15056/// \brief Mark a variable referenced, and check whether it is odr-used
15057/// (C++ [basic.def.odr]p2, C99 6.9p3).  Note that this should not be
15058/// used directly for normal expressions referring to VarDecl.
15059void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
DoMarkVarDeclReferenced(*this, Loc, Var, nullptr);
15061}

15063static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc,
                             Decl *D, Expr *E, bool MightBeOdrUse) {
if (SemaRef.isInOpenMPDeclareTargetContext())
  SemaRef.checkDeclIsAllowedInOpenMPTarget(E, D);

if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
  DoMarkVarDeclReferenced(SemaRef, Loc, Var, E);
  return;
}

SemaRef.MarkAnyDeclReferenced(Loc, D, MightBeOdrUse);

// If this is a call to a method via a cast, also mark the method in the
// derived class used in case codegen can devirtualize the call.
const MemberExpr *ME = dyn_cast<MemberExpr>(E);
if (!ME)
  return;
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
if (!MD)
  return;
// Only attempt to devirtualize if this is truly a virtual call.
bool IsVirtualCall = MD->isVirtual() &&
                        ME->performsVirtualDispatch(SemaRef.getLangOpts());
if (!IsVirtualCall)
  return;

// If it's possible to devirtualize the call, mark the called function
// referenced.
CXXMethodDecl *DM = MD->getDevirtualizedMethod(
    ME->getBase(), SemaRef.getLangOpts().AppleKext);
if (DM)
  SemaRef.MarkAnyDeclReferenced(Loc, DM, MightBeOdrUse);
15095}

15097/// \brief Perform reference-marking and odr-use handling for a DeclRefExpr.
15098void Sema::MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base) {
// TODO: update this with DR# once a defect report is filed.
// C++11 defect. The address of a pure member should not be an ODR use, even
// if it's a qualified reference.
bool OdrUse = true;
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getDecl()))
  if (Method->isVirtual() &&
      !Method->getDevirtualizedMethod(Base, getLangOpts().AppleKext))
    OdrUse = false;
MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse);
15108}

15110/// \brief Perform reference-marking and odr-use handling for a MemberExpr.
15111void Sema::MarkMemberReferenced(MemberExpr *E) {
// C++11 [basic.def.odr]p2:
//   A non-overloaded function whose name appears as a potentially-evaluated
//   expression or a member of a set of candidate functions, if selected by
//   overload resolution when referred to from a potentially-evaluated
//   expression, is odr-used, unless it is a pure virtual function and its
//   name is not explicitly qualified.
bool MightBeOdrUse = true;
if (E->performsVirtualDispatch(getLangOpts())) {
  if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
    if (Method->isPure())
      MightBeOdrUse = false;
}
SourceLocation Loc = E->getMemberLoc().isValid() ?
                          E->getMemberLoc() : E->getLocStart();
MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse);
15127}

15129/// \brief Perform marking for a reference to an arbitrary declaration.  It
15130/// marks the declaration referenced, and performs odr-use checking for
15131/// functions and variables. This method should not be used when building a
15132/// normal expression which refers to a variable.
15133void Sema::MarkAnyDeclReferenced(SourceLocation Loc, Decl *D,
                               bool MightBeOdrUse) {
if (MightBeOdrUse) {
  if (auto *VD = dyn_cast<VarDecl>(D)) {
    MarkVariableReferenced(Loc, VD);
    return;
  }
}
if (auto *FD = dyn_cast<FunctionDecl>(D)) {
  MarkFunctionReferenced(Loc, FD, MightBeOdrUse);
  return;
}
D->setReferenced();
15146}

15148namespace {
// Mark all of the declarations used by a type as referenced.
// FIXME: Not fully implemented yet! We need to have a better understanding
// of when we're entering a context we should not recurse into.
// FIXME: This is and EvaluatedExprMarker are more-or-less equivalent to
// TreeTransforms rebuilding the type in a new context. Rather than
// duplicating the TreeTransform logic, we should consider reusing it here.
// Currently that causes problems when rebuilding LambdaExprs.
class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
  Sema &S;
  SourceLocation Loc;

public:
  typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;

  MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }

  bool TraverseTemplateArgument(const TemplateArgument &Arg);
};
15167}

15169bool MarkReferencedDecls::TraverseTemplateArgument(
  const TemplateArgument &Arg) {
{
  // A non-type template argument is a constant-evaluated context.
  EnterExpressionEvaluationContext Evaluated(
      S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
  if (Arg.getKind() == TemplateArgument::Declaration) {
    if (Decl *D = Arg.getAsDecl())
      S.MarkAnyDeclReferenced(Loc, D, true);
  } else if (Arg.getKind() == TemplateArgument::Expression) {
    S.MarkDeclarationsReferencedInExpr(Arg.getAsExpr(), false);
  }
}

return Inherited::TraverseTemplateArgument(Arg);
15184}

15186void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
MarkReferencedDecls Marker(*this, Loc);
Marker.TraverseType(T);
15189}

15191namespace {
/// \brief Helper class that marks all of the declarations referenced by
/// potentially-evaluated subexpressions as "referenced".
class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
  Sema &S;
  bool SkipLocalVariables;
  
public:
  typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
  
  EvaluatedExprMarker(Sema &S, bool SkipLocalVariables) 
    : Inherited(S.Context), S(S), SkipLocalVariables(SkipLocalVariables) { }
  
  void VisitDeclRefExpr(DeclRefExpr *E) {
    // If we were asked not to visit local variables, don't.
    if (SkipLocalVariables) {
      if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
        if (VD->hasLocalStorage())
          return;
    }
    
    S.MarkDeclRefReferenced(E);
  }

  void VisitMemberExpr(MemberExpr *E) {
    S.MarkMemberReferenced(E);
    Inherited::VisitMemberExpr(E);
  }
  
  void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
    S.MarkFunctionReferenced(E->getLocStart(),
          const_cast<CXXDestructorDecl*>(E->getTemporary()->getDestructor()));
    Visit(E->getSubExpr());
  }
  
  void VisitCXXNewExpr(CXXNewExpr *E) {
    if (E->getOperatorNew())
      S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorNew());
    if (E->getOperatorDelete())
      S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorDelete());
    Inherited::VisitCXXNewExpr(E);
  }

  void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
    if (E->getOperatorDelete())
      S.MarkFunctionReferenced(E->getLocStart(), E->getOperatorDelete());
    QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
    if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
      CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
      S.MarkFunctionReferenced(E->getLocStart(), 
                                  S.LookupDestructor(Record));
    }
    
    Inherited::VisitCXXDeleteExpr(E);
  }
  
  void VisitCXXConstructExpr(CXXConstructExpr *E) {
    S.MarkFunctionReferenced(E->getLocStart(), E->getConstructor());
    Inherited::VisitCXXConstructExpr(E);
  }
  
  void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
    Visit(E->getExpr());
  }

  void VisitImplicitCastExpr(ImplicitCastExpr *E) {
    Inherited::VisitImplicitCastExpr(E);

    if (E->getCastKind() == CK_LValueToRValue)
      S.UpdateMarkingForLValueToRValue(E->getSubExpr());
  }
};
15263}

15265/// \brief Mark any declarations that appear within this expression or any
15266/// potentially-evaluated subexpressions as "referenced".
15267///
15268/// \param SkipLocalVariables If true, don't mark local variables as 
15269/// 'referenced'.
15270void Sema::MarkDeclarationsReferencedInExpr(Expr *E, 
                                          bool SkipLocalVariables) {
EvaluatedExprMarker(*this, SkipLocalVariables).Visit(E);
15273}

15275/// \brief Emit a diagnostic that describes an effect on the run-time behavior
15276/// of the program being compiled.
15277///
15278/// This routine emits the given diagnostic when the code currently being
15279/// type-checked is "potentially evaluated", meaning that there is a
15280/// possibility that the code will actually be executable. Code in sizeof()
15281/// expressions, code used only during overload resolution, etc., are not
15282/// potentially evaluated. This routine will suppress such diagnostics or,
15283/// in the absolutely nutty case of potentially potentially evaluated
15284/// expressions (C++ typeid), queue the diagnostic to potentially emit it
15285/// later.
15286///
15287/// This routine should be used for all diagnostics that describe the run-time
15288/// behavior of a program, such as passing a non-POD value through an ellipsis.
15289/// Failure to do so will likely result in spurious diagnostics or failures
15290/// during overload resolution or within sizeof/alignof/typeof/typeid.
15291bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
                             const PartialDiagnostic &PD) {
switch (ExprEvalContexts.back().Context) {
case ExpressionEvaluationContext::Unevaluated:
case ExpressionEvaluationContext::UnevaluatedList:
case ExpressionEvaluationContext::UnevaluatedAbstract:
case ExpressionEvaluationContext::DiscardedStatement:
  // The argument will never be evaluated, so don't complain.
  break;

case ExpressionEvaluationContext::ConstantEvaluated:
  // Relevant diagnostics should be produced by constant evaluation.
  break;

case ExpressionEvaluationContext::PotentiallyEvaluated:
case ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
  if (Statement && getCurFunctionOrMethodDecl()) {
    FunctionScopes.back()->PossiblyUnreachableDiags.
      push_back(sema::PossiblyUnreachableDiag(PD, Loc, Statement));
    return true;
  }

  // The initializer of a constexpr variable or of the first declaration of a
  // static data member is not syntactically a constant evaluated constant,
  // but nonetheless is always required to be a constant expression, so we
  // can skip diagnosing.
  // FIXME: Using the mangling context here is a hack.
  if (auto *VD = dyn_cast_or_null<VarDecl>(
          ExprEvalContexts.back().ManglingContextDecl)) {
    if (VD->isConstexpr() ||
        (VD->isStaticDataMember() && VD->isFirstDecl() && !VD->isInline()))
      break;
    // FIXME: For any other kind of variable, we should build a CFG for its
    // initializer and check whether the context in question is reachable.
  }

  Diag(Loc, PD);
  return true;
}

return false;
15332}

15334bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
                             CallExpr *CE, FunctionDecl *FD) {
if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
  return false;

// If we're inside a decltype's expression, don't check for a valid return
// type or construct temporaries until we know whether this is the last call.
if (ExprEvalContexts.back().IsDecltype) {
  ExprEvalContexts.back().DelayedDecltypeCalls.push_back(CE);
  return false;
}

class CallReturnIncompleteDiagnoser : public TypeDiagnoser {
  FunctionDecl *FD;
  CallExpr *CE;
  
public:
  CallReturnIncompleteDiagnoser(FunctionDecl *FD, CallExpr *CE)
    : FD(FD), CE(CE) { }

  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
    if (!FD) {
      S.Diag(Loc, diag::err_call_incomplete_return)
        << T << CE->getSourceRange();
      return;
    }
    
    S.Diag(Loc, diag::err_call_function_incomplete_return)
      << CE->getSourceRange() << FD->getDeclName() << T;
    S.Diag(FD->getLocation(), diag::note_entity_declared_at)
        << FD->getDeclName();
  }
} Diagnoser(FD, CE);

if (RequireCompleteType(Loc, ReturnType, Diagnoser))
  return true;

return false;
15372}

15374// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
15375// will prevent this condition from triggering, which is what we want.
15376void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
SourceLocation Loc;

unsigned diagnostic = diag::warn_condition_is_assignment;
bool IsOrAssign = false;

if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
  if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
    return;

  IsOrAssign = Op->getOpcode() == BO_OrAssign;

  // Greylist some idioms by putting them into a warning subcategory.
  if (ObjCMessageExpr *ME
        = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
    Selector Sel = ME->getSelector();

    // self = [<foo> init...]
    if (isSelfExpr(Op->getLHS()) && ME->getMethodFamily() == OMF_init)
      diagnostic = diag::warn_condition_is_idiomatic_assignment;

    // <foo> = [<bar> nextObject]
    else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
      diagnostic = diag::warn_condition_is_idiomatic_assignment;
  }

  Loc = Op->getOperatorLoc();
} else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
  if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
    return;

  IsOrAssign = Op->getOperator() == OO_PipeEqual;
  Loc = Op->getOperatorLoc();
} else if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E))
  return DiagnoseAssignmentAsCondition(POE->getSyntacticForm());
else {
  // Not an assignment.
  return;
}

Diag(Loc, diagnostic) << E->getSourceRange();

SourceLocation Open = E->getLocStart();
SourceLocation Close = getLocForEndOfToken(E->getSourceRange().getEnd());
Diag(Loc, diag::note_condition_assign_silence)
      << FixItHint::CreateInsertion(Open, "(")
      << FixItHint::CreateInsertion(Close, ")");

if (IsOrAssign)
  Diag(Loc, diag::note_condition_or_assign_to_comparison)
    << FixItHint::CreateReplacement(Loc, "!=");
else
  Diag(Loc, diag::note_condition_assign_to_comparison)
    << FixItHint::CreateReplacement(Loc, "==");
15430}

15432/// \brief Redundant parentheses over an equality comparison can indicate
15433/// that the user intended an assignment used as condition.
15434void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
// Don't warn if the parens came from a macro.
SourceLocation parenLoc = ParenE->getLocStart();
if (parenLoc.isInvalid() || parenLoc.isMacroID())
  return;
// Don't warn for dependent expressions.
if (ParenE->isTypeDependent())
  return;

Expr *E = ParenE->IgnoreParens();

if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
  if (opE->getOpcode() == BO_EQ &&
      opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
                                                         == Expr::MLV_Valid) {
    SourceLocation Loc = opE->getOperatorLoc();
    
    Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
    SourceRange ParenERange = ParenE->getSourceRange();
    Diag(Loc, diag::note_equality_comparison_silence)
      << FixItHint::CreateRemoval(ParenERange.getBegin())
      << FixItHint::CreateRemoval(ParenERange.getEnd());
    Diag(Loc, diag::note_equality_comparison_to_assign)
      << FixItHint::CreateReplacement(Loc, "=");
  }
15459}

15461ExprResult Sema::CheckBooleanCondition(SourceLocation Loc, Expr *E,
                                     bool IsConstexpr) {
DiagnoseAssignmentAsCondition(E);
if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
  DiagnoseEqualityWithExtraParens(parenE);

ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return ExprError();
E = result.get();

if (!E->isTypeDependent()) {
  if (getLangOpts().CPlusPlus)
    return CheckCXXBooleanCondition(E, IsConstexpr); // C++ 6.4p4

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

  QualType T = E->getType();
  if (!T->isScalarType()) { // C99 6.8.4.1p1
    Diag(Loc, diag::err_typecheck_statement_requires_scalar)
      << T << E->getSourceRange();
    return ExprError();
  }
  CheckBoolLikeConversion(E, Loc);
}

return E;
15490}

15492Sema::ConditionResult Sema::ActOnCondition(Scope *S, SourceLocation Loc,
                                         Expr *SubExpr, ConditionKind CK) {
// Empty conditions are valid in for-statements.
if (!SubExpr)
  return ConditionResult();

ExprResult Cond;
switch (CK) {
case ConditionKind::Boolean:
  Cond = CheckBooleanCondition(Loc, SubExpr);
  break;

case ConditionKind::ConstexprIf:
  Cond = CheckBooleanCondition(Loc, SubExpr, true);
  break;

case ConditionKind::Switch:
  Cond = CheckSwitchCondition(Loc, SubExpr);
  break;
}
if (Cond.isInvalid())
  return ConditionError();

// FIXME: FullExprArg doesn't have an invalid bit, so check nullness instead.
FullExprArg FullExpr = MakeFullExpr(Cond.get(), Loc);
if (!FullExpr.get())
  return ConditionError();

return ConditionResult(*this, nullptr, FullExpr,
                       CK == ConditionKind::ConstexprIf);
15522}

15524namespace {
/// A visitor for rebuilding a call to an __unknown_any expression
/// to have an appropriate type.
struct RebuildUnknownAnyFunction
  : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {

  Sema &S;

  RebuildUnknownAnyFunction(Sema &S) : S(S) {}

  ExprResult VisitStmt(Stmt *S) {
    llvm_unreachable("unexpected statement!")::llvm::llvm_unreachable_internal("unexpected statement!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15535);
  }

  ExprResult VisitExpr(Expr *E) {
    S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
      << E->getSourceRange();
    return ExprError();
  }

  /// Rebuild an expression which simply semantically wraps another
  /// expression which it shares the type and value kind of.
  template <class T> ExprResult rebuildSugarExpr(T *E) {
    ExprResult SubResult = Visit(E->getSubExpr());
    if (SubResult.isInvalid()) return ExprError();

    Expr *SubExpr = SubResult.get();
    E->setSubExpr(SubExpr);
    E->setType(SubExpr->getType());
    E->setValueKind(SubExpr->getValueKind());
    assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15554, __extension__ __PRETTY_FUNCTION__));
    return E;
  }

  ExprResult VisitParenExpr(ParenExpr *E) {
    return rebuildSugarExpr(E);
  }

  ExprResult VisitUnaryExtension(UnaryOperator *E) {
    return rebuildSugarExpr(E);
  }

  ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
    ExprResult SubResult = Visit(E->getSubExpr());
    if (SubResult.isInvalid()) return ExprError();

    Expr *SubExpr = SubResult.get();
    E->setSubExpr(SubExpr);
    E->setType(S.Context.getPointerType(SubExpr->getType()));
    assert(E->getValueKind() == VK_RValue)(static_cast <bool> (E->getValueKind() == VK_RValue)
 ? void (0) : __assert_fail ("E->getValueKind() == VK_RValue"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15573, __extension__ __PRETTY_FUNCTION__));
    assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15574, __extension__ __PRETTY_FUNCTION__));
    return E;
  }

  ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
    if (!isa<FunctionDecl>(VD)) return VisitExpr(E);

    E->setType(VD->getType());

    assert(E->getValueKind() == VK_RValue)(static_cast <bool> (E->getValueKind() == VK_RValue)
 ? void (0) : __assert_fail ("E->getValueKind() == VK_RValue"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15583, __extension__ __PRETTY_FUNCTION__));
    if (S.getLangOpts().CPlusPlus &&
        !(isa<CXXMethodDecl>(VD) &&
          cast<CXXMethodDecl>(VD)->isInstance()))
      E->setValueKind(VK_LValue);

    return E;
  }

  ExprResult VisitMemberExpr(MemberExpr *E) {
    return resolveDecl(E, E->getMemberDecl());
  }

  ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
    return resolveDecl(E, E->getDecl());
  }
};
15600}

15602/// Given a function expression of unknown-any type, try to rebuild it
15603/// to have a function type.
15604static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
if (Result.isInvalid()) return ExprError();
return S.DefaultFunctionArrayConversion(Result.get());
15608}

15610namespace {
/// A visitor for rebuilding an expression of type __unknown_anytype
/// into one which resolves the type directly on the referring
/// expression.  Strict preservation of the original source
/// structure is not a goal.
struct RebuildUnknownAnyExpr
  : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {

  Sema &S;

  /// The current destination type.
  QualType DestType;

  RebuildUnknownAnyExpr(Sema &S, QualType CastType)
    : S(S), DestType(CastType) {}

  ExprResult VisitStmt(Stmt *S) {
    llvm_unreachable("unexpected statement!")::llvm::llvm_unreachable_internal("unexpected statement!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15627);
  }

  ExprResult VisitExpr(Expr *E) {
    S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
      << E->getSourceRange();
    return ExprError();
  }

  ExprResult VisitCallExpr(CallExpr *E);
  ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);

  /// Rebuild an expression which simply semantically wraps another
  /// expression which it shares the type and value kind of.
  template <class T> ExprResult rebuildSugarExpr(T *E) {
    ExprResult SubResult = Visit(E->getSubExpr());
    if (SubResult.isInvalid()) return ExprError();
    Expr *SubExpr = SubResult.get();
    E->setSubExpr(SubExpr);
    E->setType(SubExpr->getType());
    E->setValueKind(SubExpr->getValueKind());
    assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15648, __extension__ __PRETTY_FUNCTION__));
    return E;
  }

  ExprResult VisitParenExpr(ParenExpr *E) {
    return rebuildSugarExpr(E);
  }

  ExprResult VisitUnaryExtension(UnaryOperator *E) {
    return rebuildSugarExpr(E);
  }

  ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
    const PointerType *Ptr = DestType->getAs<PointerType>();
    if (!Ptr) {
      S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
        << E->getSourceRange();
      return ExprError();
    }

    if (isa<CallExpr>(E->getSubExpr())) {
      S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof_call)
        << E->getSourceRange();
      return ExprError();
    }

    assert(E->getValueKind() == VK_RValue)(static_cast <bool> (E->getValueKind() == VK_RValue)
 ? void (0) : __assert_fail ("E->getValueKind() == VK_RValue"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15674, __extension__ __PRETTY_FUNCTION__));
    assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15675, __extension__ __PRETTY_FUNCTION__));
    E->setType(DestType);

    // Build the sub-expression as if it were an object of the pointee type.
    DestType = Ptr->getPointeeType();
    ExprResult SubResult = Visit(E->getSubExpr());
    if (SubResult.isInvalid()) return ExprError();
    E->setSubExpr(SubResult.get());
    return E;
  }

  ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);

  ExprResult resolveDecl(Expr *E, ValueDecl *VD);

  ExprResult VisitMemberExpr(MemberExpr *E) {
    return resolveDecl(E, E->getMemberDecl());
  }

  ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
    return resolveDecl(E, E->getDecl());
  }
};
15698}

15700/// Rebuilds a call expression which yielded __unknown_anytype.
15701ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
Expr *CalleeExpr = E->getCallee();

enum FnKind {
  FK_MemberFunction,
  FK_FunctionPointer,
  FK_BlockPointer
};

FnKind Kind;
QualType CalleeType = CalleeExpr->getType();
if (CalleeType == S.Context.BoundMemberTy) {
  assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E))(static_cast <bool> (isa<CXXMemberCallExpr>(E) ||
 isa<CXXOperatorCallExpr>(E)) ? void (0) : __assert_fail
 ("isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15713, __extension__ __PRETTY_FUNCTION__));
  Kind = FK_MemberFunction;
  CalleeType = Expr::findBoundMemberType(CalleeExpr);
} else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
  CalleeType = Ptr->getPointeeType();
  Kind = FK_FunctionPointer;
} else {
  CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
  Kind = FK_BlockPointer;
}
const FunctionType *FnType = CalleeType->castAs<FunctionType>();

// Verify that this is a legal result type of a function.
if (DestType->isArrayType() || DestType->isFunctionType()) {
  unsigned diagID = diag::err_func_returning_array_function;
  if (Kind == FK_BlockPointer)
    diagID = diag::err_block_returning_array_function;

  S.Diag(E->getExprLoc(), diagID)
    << DestType->isFunctionType() << DestType;
  return ExprError();
}

// Otherwise, go ahead and set DestType as the call's result.
E->setType(DestType.getNonLValueExprType(S.Context));
E->setValueKind(Expr::getValueKindForType(DestType));
assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15739, __extension__ __PRETTY_FUNCTION__));

// Rebuild the function type, replacing the result type with DestType.
const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType);
if (Proto) {
  // __unknown_anytype(...) is a special case used by the debugger when
  // it has no idea what a function's signature is.
  //
  // We want to build this call essentially under the K&R
  // unprototyped rules, but making a FunctionNoProtoType in C++
  // would foul up all sorts of assumptions.  However, we cannot
  // simply pass all arguments as variadic arguments, nor can we
  // portably just call the function under a non-variadic type; see
  // the comment on IR-gen's TargetInfo::isNoProtoCallVariadic.
  // However, it turns out that in practice it is generally safe to
  // call a function declared as "A foo(B,C,D);" under the prototype
  // "A foo(B,C,D,...);".  The only known exception is with the
  // Windows ABI, where any variadic function is implicitly cdecl
  // regardless of its normal CC.  Therefore we change the parameter
  // types to match the types of the arguments.
  //
  // This is a hack, but it is far superior to moving the
  // corresponding target-specific code from IR-gen to Sema/AST.

  ArrayRef<QualType> ParamTypes = Proto->getParamTypes();
  SmallVector<QualType, 8> ArgTypes;
  if (ParamTypes.empty() && Proto->isVariadic()) { // the special case
    ArgTypes.reserve(E->getNumArgs());
    for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
      Expr *Arg = E->getArg(i);
      QualType ArgType = Arg->getType();
      if (E->isLValue()) {
        ArgType = S.Context.getLValueReferenceType(ArgType);
      } else if (E->isXValue()) {
        ArgType = S.Context.getRValueReferenceType(ArgType);
      }
      ArgTypes.push_back(ArgType);
    }
    ParamTypes = ArgTypes;
  }
  DestType = S.Context.getFunctionType(DestType, ParamTypes,
                                       Proto->getExtProtoInfo());
} else {
  DestType = S.Context.getFunctionNoProtoType(DestType,
                                              FnType->getExtInfo());
}

// Rebuild the appropriate pointer-to-function type.
switch (Kind) { 
case FK_MemberFunction:
  // Nothing to do.
  break;

case FK_FunctionPointer:
  DestType = S.Context.getPointerType(DestType);
  break;

case FK_BlockPointer:
  DestType = S.Context.getBlockPointerType(DestType);
  break;
}

// Finally, we can recurse.
ExprResult CalleeResult = Visit(CalleeExpr);
if (!CalleeResult.isUsable()) return ExprError();
E->setCallee(CalleeResult.get());

// Bind a temporary if necessary.
return S.MaybeBindToTemporary(E);
15808}

15810ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
// Verify that this is a legal result type of a call.
if (DestType->isArrayType() || DestType->isFunctionType()) {
  S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
    << DestType->isFunctionType() << DestType;
  return ExprError();
}

// Rewrite the method result type if available.
if (ObjCMethodDecl *Method = E->getMethodDecl()) {
  assert(Method->getReturnType() == S.Context.UnknownAnyTy)(static_cast <bool> (Method->getReturnType() == S.Context
.UnknownAnyTy) ? void (0) : __assert_fail ("Method->getReturnType() == S.Context.UnknownAnyTy"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15820, __extension__ __PRETTY_FUNCTION__));
  Method->setReturnType(DestType);
}

// Change the type of the message.
E->setType(DestType.getNonReferenceType());
E->setValueKind(Expr::getValueKindForType(DestType));

return S.MaybeBindToTemporary(E);
15829}

15831ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
// The only case we should ever see here is a function-to-pointer decay.
if (E->getCastKind() == CK_FunctionToPointerDecay) {
  assert(E->getValueKind() == VK_RValue)(static_cast <bool> (E->getValueKind() == VK_RValue)
 ? void (0) : __assert_fail ("E->getValueKind() == VK_RValue"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15834, __extension__ __PRETTY_FUNCTION__));
  assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15835, __extension__ __PRETTY_FUNCTION__));

  E->setType(DestType);

  // Rebuild the sub-expression as the pointee (function) type.
  DestType = DestType->castAs<PointerType>()->getPointeeType();

  ExprResult Result = Visit(E->getSubExpr());
  if (!Result.isUsable()) return ExprError();

  E->setSubExpr(Result.get());
  return E;
} else if (E->getCastKind() == CK_LValueToRValue) {
  assert(E->getValueKind() == VK_RValue)(static_cast <bool> (E->getValueKind() == VK_RValue)
 ? void (0) : __assert_fail ("E->getValueKind() == VK_RValue"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15848, __extension__ __PRETTY_FUNCTION__));
  assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15849, __extension__ __PRETTY_FUNCTION__));

  assert(isa<BlockPointerType>(E->getType()))(static_cast <bool> (isa<BlockPointerType>(E->
getType())) ? void (0) : __assert_fail ("isa<BlockPointerType>(E->getType())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15851, __extension__ __PRETTY_FUNCTION__));

  E->setType(DestType);

  // The sub-expression has to be a lvalue reference, so rebuild it as such.
  DestType = S.Context.getLValueReferenceType(DestType);

  ExprResult Result = Visit(E->getSubExpr());
  if (!Result.isUsable()) return ExprError();

  E->setSubExpr(Result.get());
  return E;
} else {
  llvm_unreachable("Unhandled cast type!")::llvm::llvm_unreachable_internal("Unhandled cast type!", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15864);
}
15866}

15868ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
ExprValueKind ValueKind = VK_LValue;
QualType Type = DestType;

// We know how to make this work for certain kinds of decls:

//  - functions
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
  if (const PointerType *Ptr = Type->getAs<PointerType>()) {
    DestType = Ptr->getPointeeType();
    ExprResult Result = resolveDecl(E, VD);
    if (Result.isInvalid()) return ExprError();
    return S.ImpCastExprToType(Result.get(), Type,
                               CK_FunctionToPointerDecay, VK_RValue);
  }

  if (!Type->isFunctionType()) {
    S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
      << VD << E->getSourceRange();
    return ExprError();
  }
  if (const FunctionProtoType *FT = Type->getAs<FunctionProtoType>()) {
    // We must match the FunctionDecl's type to the hack introduced in
    // RebuildUnknownAnyExpr::VisitCallExpr to vararg functions of unknown
    // type. See the lengthy commentary in that routine.
    QualType FDT = FD->getType();
    const FunctionType *FnType = FDT->castAs<FunctionType>();
    const FunctionProtoType *Proto = dyn_cast_or_null<FunctionProtoType>(FnType);
    DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
    if (DRE && Proto && Proto->getParamTypes().empty() && Proto->isVariadic()) {
      SourceLocation Loc = FD->getLocation();
      FunctionDecl *NewFD = FunctionDecl::Create(FD->getASTContext(),
                                    FD->getDeclContext(),
                                    Loc, Loc, FD->getNameInfo().getName(),
                                    DestType, FD->getTypeSourceInfo(),
                                    SC_None, false/*isInlineSpecified*/,
                                    FD->hasPrototype(),
                                    false/*isConstexprSpecified*/);
        
      if (FD->getQualifier())
        NewFD->setQualifierInfo(FD->getQualifierLoc());

      SmallVector<ParmVarDecl*, 16> Params;
      for (const auto &AI : FT->param_types()) {
        ParmVarDecl *Param =
          S.BuildParmVarDeclForTypedef(FD, Loc, AI);
        Param->setScopeInfo(0, Params.size());
        Params.push_back(Param);
      }
      NewFD->setParams(Params);
      DRE->setDecl(NewFD);
      VD = DRE->getDecl();
    }
  }

  if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
    if (MD->isInstance()) {
      ValueKind = VK_RValue;
      Type = S.Context.BoundMemberTy;
    }

  // Function references aren't l-values in C.
  if (!S.getLangOpts().CPlusPlus)
    ValueKind = VK_RValue;

//  - variables
} else if (isa<VarDecl>(VD)) {
  if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
    Type = RefTy->getPointeeType();
  } else if (Type->isFunctionType()) {
    S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
      << VD << E->getSourceRange();
    return ExprError();
  }

//  - nothing else
} else {
  S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
    << VD << E->getSourceRange();
  return ExprError();
}

// Modifying the declaration like this is friendly to IR-gen but
// also really dangerous.
VD->setType(DestType);
E->setType(Type);
E->setValueKind(ValueKind);
return E;
15956}

15958/// Check a cast of an unknown-any type.  We intentionally only
15959/// trigger this for C-style casts.
15960ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
                                   Expr *CastExpr, CastKind &CastKind,
                                   ExprValueKind &VK, CXXCastPath &Path) {
// The type we're casting to must be either void or complete.
if (!CastType->isVoidType() &&
    RequireCompleteType(TypeRange.getBegin(), CastType,
                        diag::err_typecheck_cast_to_incomplete))
  return ExprError();

// Rewrite the casted expression from scratch.
ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
if (!result.isUsable()) return ExprError();

CastExpr = result.get();
VK = CastExpr->getValueKind();
CastKind = CK_NoOp;

return CastExpr;
15978}

15980ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
15982}

15984ExprResult Sema::checkUnknownAnyArg(SourceLocation callLoc,
                                  Expr *arg, QualType &paramType) {
// If the syntactic form of the argument is not an explicit cast of
// any sort, just do default argument promotion.
ExplicitCastExpr *castArg = dyn_cast<ExplicitCastExpr>(arg->IgnoreParens());
if (!castArg) {
  ExprResult result = DefaultArgumentPromotion(arg);
  if (result.isInvalid()) return ExprError();
  paramType = result.get()->getType();
  return result;
}

// Otherwise, use the type that was written in the explicit cast.
assert(!arg->hasPlaceholderType())(static_cast <bool> (!arg->hasPlaceholderType()) ? void
 (0) : __assert_fail ("!arg->hasPlaceholderType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 15997, __extension__ __PRETTY_FUNCTION__));
paramType = castArg->getTypeAsWritten();

// Copy-initialize a parameter of that type.
InitializedEntity entity =
  InitializedEntity::InitializeParameter(Context, paramType,
                                         /*consumed*/ false);
return PerformCopyInitialization(entity, callLoc, arg);
16005}

16007static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
Expr *orig = E;
unsigned diagID = diag::err_uncasted_use_of_unknown_any;
while (true) {
  E = E->IgnoreParenImpCasts();
  if (CallExpr *call = dyn_cast<CallExpr>(E)) {
    E = call->getCallee();
    diagID = diag::err_uncasted_call_of_unknown_any;
  } else {
    break;
  }
}

SourceLocation loc;
NamedDecl *d;
if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
  loc = ref->getLocation();
  d = ref->getDecl();
} else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
  loc = mem->getMemberLoc();
  d = mem->getMemberDecl();
} else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
  diagID = diag::err_uncasted_call_of_unknown_any;
  loc = msg->getSelectorStartLoc();
  d = msg->getMethodDecl();
  if (!d) {
    S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
      << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
      << orig->getSourceRange();
    return ExprError();
  }
} else {
  S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
    << E->getSourceRange();
  return ExprError();
}

S.Diag(loc, diagID) << d << orig->getSourceRange();

// Never recoverable.
return ExprError();
16048}

16050/// Check for operands with placeholder types and complain if found.
16051/// Returns ExprError() if there was an error and no recovery was possible.
16052ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
if (!getLangOpts().CPlusPlus) {
  // C cannot handle TypoExpr nodes on either side of a binop because it
  // doesn't handle dependent types properly, so make sure any TypoExprs have
  // been dealt with before checking the operands.
  ExprResult Result = CorrectDelayedTyposInExpr(E);
  if (!Result.isUsable()) return ExprError();
  E = Result.get();
}

const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
if (!placeholderType) return E;

switch (placeholderType->getKind()) {

// Overloaded expressions.
case BuiltinType::Overload: {
  // Try to resolve a single function template specialization.
  // This is obligatory.
  ExprResult Result = E;
  if (ResolveAndFixSingleFunctionTemplateSpecialization(Result, false))
    return Result;

  // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
  // leaves Result unchanged on failure.
  Result = E;
  if (resolveAndFixAddressOfOnlyViableOverloadCandidate(Result))
    return Result;

  // If that failed, try to recover with a call.
  tryToRecoverWithCall(Result, PDiag(diag::err_ovl_unresolvable),
                       /*complain*/ true);
  return Result;
}

// Bound member functions.
case BuiltinType::BoundMember: {
  ExprResult result = E;
  const Expr *BME = E->IgnoreParens();
  PartialDiagnostic PD = PDiag(diag::err_bound_member_function);
  // Try to give a nicer diagnostic if it is a bound member that we recognize.
  if (isa<CXXPseudoDestructorExpr>(BME)) {
    PD = PDiag(diag::err_dtor_expr_without_call) << /*pseudo-destructor*/ 1;
  } else if (const auto *ME = dyn_cast<MemberExpr>(BME)) {
    if (ME->getMemberNameInfo().getName().getNameKind() ==
        DeclarationName::CXXDestructorName)
      PD = PDiag(diag::err_dtor_expr_without_call) << /*destructor*/ 0;
  }
  tryToRecoverWithCall(result, PD,
                       /*complain*/ true);
  return result;
}

// ARC unbridged casts.
case BuiltinType::ARCUnbridgedCast: {
  Expr *realCast = stripARCUnbridgedCast(E);
  diagnoseARCUnbridgedCast(realCast);
  return realCast;
}

// Expressions of unknown type.
case BuiltinType::UnknownAny:
  return diagnoseUnknownAnyExpr(*this, E);

// Pseudo-objects.
case BuiltinType::PseudoObject:
  return checkPseudoObjectRValue(E);

case BuiltinType::BuiltinFn: {
  // Accept __noop without parens by implicitly converting it to a call expr.
  auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
  if (DRE) {
    auto *FD = cast<FunctionDecl>(DRE->getDecl());
    if (FD->getBuiltinID() == Builtin::BI__noop) {
      E = ImpCastExprToType(E, Context.getPointerType(FD->getType()),
                            CK_BuiltinFnToFnPtr).get();
      return new (Context) CallExpr(Context, E, None, Context.IntTy,
                                    VK_RValue, SourceLocation());
    }
  }

  Diag(E->getLocStart(), diag::err_builtin_fn_use);
  return ExprError();
}

// Expressions of unknown type.
case BuiltinType::OMPArraySection:
  Diag(E->getLocStart(), diag::err_omp_array_section_use);
  return ExprError();

// Everything else should be impossible.
16143#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id:
16145#include "clang/Basic/OpenCLImageTypes.def"
16146#define BUILTIN_TYPE(Id, SingletonId) case BuiltinType::Id:
16147#define PLACEHOLDER_TYPE(Id, SingletonId)
16148#include "clang/AST/BuiltinTypes.def"
  break;
}

llvm_unreachable("invalid placeholder type!")::llvm::llvm_unreachable_internal("invalid placeholder type!"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 16152);
16153}

16155bool Sema::CheckCaseExpression(Expr *E) {
if (E->isTypeDependent())
  return true;
if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
  return E->getType()->isIntegralOrEnumerationType();
return false;
16161}

16163/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
16164ExprResult
16165Sema::ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
assert((Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) &&(static_cast <bool> ((Kind == tok::kw___objc_yes || Kind
 == tok::kw___objc_no) && "Unknown Objective-C Boolean value!"
) ? void (0) : __assert_fail ("(Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) && \"Unknown Objective-C Boolean value!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 16167, __extension__ __PRETTY_FUNCTION__))
       "Unknown Objective-C Boolean value!")(static_cast <bool> ((Kind == tok::kw___objc_yes || Kind
 == tok::kw___objc_no) && "Unknown Objective-C Boolean value!"
) ? void (0) : __assert_fail ("(Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) && \"Unknown Objective-C Boolean value!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Sema/SemaExpr.cpp"
, 16167, __extension__ __PRETTY_FUNCTION__));
QualType BoolT = Context.ObjCBuiltinBoolTy;
if (!Context.getBOOLDecl()) {
  LookupResult Result(*this, &Context.Idents.get("BOOL"), OpLoc,
                      Sema::LookupOrdinaryName);
  if (LookupName(Result, getCurScope()) && Result.isSingleResult()) {
    NamedDecl *ND = Result.getFoundDecl();
    if (TypedefDecl *TD = dyn_cast<TypedefDecl>(ND)) 
      Context.setBOOLDecl(TD);
  }
}
if (Context.getBOOLDecl())
  BoolT = Context.getBOOLType();
return new (Context)
    ObjCBoolLiteralExpr(Kind == tok::kw___objc_yes, BoolT, OpLoc);
16182}

16184ExprResult Sema::ActOnObjCAvailabilityCheckExpr(
  llvm::ArrayRef<AvailabilitySpec> AvailSpecs, SourceLocation AtLoc,
  SourceLocation RParen) {

StringRef Platform = getASTContext().getTargetInfo().getPlatformName();

auto Spec = std::find_if(AvailSpecs.begin(), AvailSpecs.end(),
                         [&](const AvailabilitySpec &Spec) {
                           return Spec.getPlatform() == Platform;
                         });

VersionTuple Version;
if (Spec != AvailSpecs.end())
  Version = Spec->getVersion();

// The use of `@available` in the enclosing function should be analyzed to
// warn when it's used inappropriately (i.e. not if(@available)).
if (getCurFunctionOrMethodDecl())
  getEnclosingFunction()->HasPotentialAvailabilityViolations = true;
else if (getCurBlock() || getCurLambda())
  getCurFunction()->HasPotentialAvailabilityViolations = true;

return new (Context)
    ObjCAvailabilityCheckExpr(Version, AtLoc, RParen, Context.BoolTy);
16208}

←

/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h

→

1//===- DeclarationName.h - Representation of declaration names --*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the DeclarationName and DeclarationNameTable classes.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_CLANG_AST_DECLARATIONNAME_H
15#define LLVM_CLANG_AST_DECLARATIONNAME_H

17#include "clang/Basic/Diagnostic.h"
18#include "clang/Basic/IdentifierTable.h"
19#include "clang/Basic/PartialDiagnostic.h"
20#include "clang/Basic/SourceLocation.h"
21#include "llvm/ADT/DenseMapInfo.h"
22#include "llvm/Support/Compiler.h"
23#include "llvm/Support/type_traits.h"
24#include <cassert>
25#include <cstdint>
26#include <cstring>
27#include <string>

29namespace clang {

31class ASTContext;
32template <typename> class CanQual;
33class CXXDeductionGuideNameExtra;
34class CXXLiteralOperatorIdName;
35class CXXOperatorIdName;
36class CXXSpecialName;
37class DeclarationNameExtra;
38class IdentifierInfo;
39class MultiKeywordSelector;
40enum OverloadedOperatorKind : int;
41struct PrintingPolicy;
42class QualType;
43class TemplateDecl;
44class Type;
45class TypeSourceInfo;
46class UsingDirectiveDecl;

48using CanQualType = CanQual<Type>;

50/// DeclarationName - The name of a declaration. In the common case,
51/// this just stores an IdentifierInfo pointer to a normal
52/// name. However, it also provides encodings for Objective-C
53/// selectors (optimizing zero- and one-argument selectors, which make
54/// up 78% percent of all selectors in Cocoa.h) and special C++ names
55/// for constructors, destructors, and conversion functions.
56class DeclarationName {
57public:
/// NameKind - The kind of name this object contains.
enum NameKind {
  Identifier,
  ObjCZeroArgSelector,
  ObjCOneArgSelector,
  ObjCMultiArgSelector,
  CXXConstructorName,
  CXXDestructorName,
  CXXConversionFunctionName,
  CXXDeductionGuideName,
  CXXOperatorName,
  CXXLiteralOperatorName,
  CXXUsingDirective
};

static const unsigned NumNameKinds = CXXUsingDirective + 1;

75private:
friend class DeclarationNameTable;
friend class NamedDecl;

/// StoredNameKind - The kind of name that is actually stored in the
/// upper bits of the Ptr field. This is only used internally.
///
/// Note: The entries here are synchronized with the entries in Selector,
/// for efficient translation between the two.
enum StoredNameKind {
  StoredIdentifier = 0,
  StoredObjCZeroArgSelector = 0x01,
  StoredObjCOneArgSelector = 0x02,
  StoredDeclarationNameExtra = 0x03,
  PtrMask = 0x03
};

/// Ptr - The lowest two bits are used to express what kind of name
/// we're actually storing, using the values of NameKind. Depending
/// on the kind of name this is, the upper bits of Ptr may have one
/// of several different meanings:
///
///   StoredIdentifier - The name is a normal identifier, and Ptr is
///   a normal IdentifierInfo pointer.
///
///   StoredObjCZeroArgSelector - The name is an Objective-C
///   selector with zero arguments, and Ptr is an IdentifierInfo
///   pointer pointing to the selector name.
///
///   StoredObjCOneArgSelector - The name is an Objective-C selector
///   with one argument, and Ptr is an IdentifierInfo pointer
///   pointing to the selector name.
///
///   StoredDeclarationNameExtra - Ptr is actually a pointer to a
///   DeclarationNameExtra structure, whose first value will tell us
///   whether this is an Objective-C selector, C++ operator-id name,
///   or special C++ name.
uintptr_t Ptr = 0;

// Construct a declaration name from the name of a C++ constructor,
// destructor, or conversion function.
DeclarationName(DeclarationNameExtra *Name)
    : Ptr(reinterpret_cast<uintptr_t>(Name)) {
  assert((Ptr & PtrMask) == 0 && "Improperly aligned DeclarationNameExtra")(static_cast <bool> ((Ptr & PtrMask) == 0 &&
 "Improperly aligned DeclarationNameExtra") ? void (0) : __assert_fail
 ("(Ptr & PtrMask) == 0 && \"Improperly aligned DeclarationNameExtra\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 118, __extension__ __PRETTY_FUNCTION__));
  Ptr |= StoredDeclarationNameExtra;
}

/// Construct a declaration name from a raw pointer.
DeclarationName(uintptr_t Ptr) : Ptr(Ptr) {}

/// getStoredNameKind - Return the kind of object that is stored in
/// Ptr.
StoredNameKind getStoredNameKind() const {
  return static_cast<StoredNameKind>(Ptr & PtrMask);
}

/// getExtra - Get the "extra" information associated with this
/// multi-argument selector or C++ special name.
DeclarationNameExtra *getExtra() const {
  assert(getStoredNameKind() == StoredDeclarationNameExtra &&(static_cast <bool> (getStoredNameKind() == StoredDeclarationNameExtra
 && "Declaration name does not store an Extra structure"
) ? void (0) : __assert_fail ("getStoredNameKind() == StoredDeclarationNameExtra && \"Declaration name does not store an Extra structure\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 135, __extension__ __PRETTY_FUNCTION__))
         "Declaration name does not store an Extra structure")(static_cast <bool> (getStoredNameKind() == StoredDeclarationNameExtra
 && "Declaration name does not store an Extra structure"
) ? void (0) : __assert_fail ("getStoredNameKind() == StoredDeclarationNameExtra && \"Declaration name does not store an Extra structure\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 135, __extension__ __PRETTY_FUNCTION__));
  return reinterpret_cast<DeclarationNameExtra *>(Ptr & ~PtrMask);
}

/// getAsCXXSpecialName - If the stored pointer is actually a
/// CXXSpecialName, returns a pointer to it. Otherwise, returns
/// a NULL pointer.
CXXSpecialName *getAsCXXSpecialName() const {
  NameKind Kind = getNameKind();
  if (Kind >= CXXConstructorName && Kind <= CXXConversionFunctionName)
    return reinterpret_cast<CXXSpecialName *>(getExtra());
  return nullptr;
}

/// If the stored pointer is actually a CXXDeductionGuideNameExtra, returns a
/// pointer to it. Otherwise, returns a NULL pointer.
CXXDeductionGuideNameExtra *getAsCXXDeductionGuideNameExtra() const {
  if (getNameKind() == CXXDeductionGuideName)
    return reinterpret_cast<CXXDeductionGuideNameExtra *>(getExtra());
  return nullptr;
}

/// getAsCXXOperatorIdName
CXXOperatorIdName *getAsCXXOperatorIdName() const {
  if (getNameKind() == CXXOperatorName)
    return reinterpret_cast<CXXOperatorIdName *>(getExtra());
  return nullptr;
}

CXXLiteralOperatorIdName *getAsCXXLiteralOperatorIdName() const {
  if (getNameKind() == CXXLiteralOperatorName)
    return reinterpret_cast<CXXLiteralOperatorIdName *>(getExtra());
  return nullptr;
}

/// getFETokenInfoAsVoidSlow - Retrieves the front end-specified pointer
/// for this name as a void pointer if it's not an identifier.
void *getFETokenInfoAsVoidSlow() const;

174public:
/// DeclarationName - Used to create an empty selector.
DeclarationName() = default;

// Construct a declaration name from an IdentifierInfo *.
DeclarationName(const IdentifierInfo *II)
    : Ptr(reinterpret_cast<uintptr_t>(II)) {
  assert((Ptr & PtrMask) == 0 && "Improperly aligned IdentifierInfo")(static_cast <bool> ((Ptr & PtrMask) == 0 &&
 "Improperly aligned IdentifierInfo") ? void (0) : __assert_fail
 ("(Ptr & PtrMask) == 0 && \"Improperly aligned IdentifierInfo\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 181, __extension__ __PRETTY_FUNCTION__));
}

// Construct a declaration name from an Objective-C selector.
DeclarationName(Selector Sel) : Ptr(Sel.InfoPtr) {}

/// getUsingDirectiveName - Return name for all using-directives.
static DeclarationName getUsingDirectiveName();

// operator bool() - Evaluates true when this declaration name is
// non-empty.
explicit operator bool() const {
  return ((Ptr & PtrMask) != 0) ||
         (reinterpret_cast<IdentifierInfo *>(Ptr & ~PtrMask));
}

/// \brief Evaluates true when this declaration name is empty.
bool isEmpty() const {
  return !*this;
}

/// Predicate functions for querying what type of name this is.
bool isIdentifier() const { return getStoredNameKind() == StoredIdentifier; }
bool isObjCZeroArgSelector() const {
  return getStoredNameKind() == StoredObjCZeroArgSelector;
}
bool isObjCOneArgSelector() const {
  return getStoredNameKind() == StoredObjCOneArgSelector;
}

/// getNameKind - Determine what kind of name this is.
NameKind getNameKind() const;

/// \brief Determines whether the name itself is dependent, e.g., because it 
/// involves a C++ type that is itself dependent.
///
/// Note that this does not capture all of the notions of "dependent name",
/// because an identifier can be a dependent name if it is used as the 
/// callee in a call expression with dependent arguments.
bool isDependentName() const;

/// getNameAsString - Retrieve the human-readable string for this name.
std::string getAsString() const;

/// getAsIdentifierInfo - Retrieve the IdentifierInfo * stored in
/// this declaration name, or NULL if this declaration name isn't a
/// simple identifier.
IdentifierInfo *getAsIdentifierInfo() const {
  if (isIdentifier())
    return reinterpret_cast<IdentifierInfo *>(Ptr);
  return nullptr;
}

/// getAsOpaqueInteger - Get the representation of this declaration
/// name as an opaque integer.
uintptr_t getAsOpaqueInteger() const { return Ptr; }

/// getAsOpaquePtr - Get the representation of this declaration name as
/// an opaque pointer.
void *getAsOpaquePtr() const { return reinterpret_cast<void*>(Ptr); }

static DeclarationName getFromOpaquePtr(void *P) {
  DeclarationName N;
  N.Ptr = reinterpret_cast<uintptr_t> (P);
  return N;
}

static DeclarationName getFromOpaqueInteger(uintptr_t P) {
  DeclarationName N;
  N.Ptr = P;
  return N;
}

/// getCXXNameType - If this name is one of the C++ names (of a
/// constructor, destructor, or conversion function), return the
/// type associated with that name.
QualType getCXXNameType() const;

/// If this name is the name of a C++ deduction guide, return the
/// template associated with that name.
TemplateDecl *getCXXDeductionGuideTemplate() const;

/// getCXXOverloadedOperator - If this name is the name of an
/// overloadable operator in C++ (e.g., @c operator+), retrieve the
/// kind of overloaded operator.
OverloadedOperatorKind getCXXOverloadedOperator() const;

/// getCXXLiteralIdentifier - If this name is the name of a literal
/// operator, retrieve the identifier associated with it.
IdentifierInfo *getCXXLiteralIdentifier() const;

/// getObjCSelector - Get the Objective-C selector stored in this
/// declaration name.
Selector getObjCSelector() const {
  assert((getNameKind() == ObjCZeroArgSelector ||(static_cast <bool> ((getNameKind() == ObjCZeroArgSelector
 || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector
 || Ptr == 0) && "Not a selector!") ? void (0) : __assert_fail
 ("(getNameKind() == ObjCZeroArgSelector || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector || Ptr == 0) && \"Not a selector!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 278, __extension__ __PRETTY_FUNCTION__))
          getNameKind() == ObjCOneArgSelector ||(static_cast <bool> ((getNameKind() == ObjCZeroArgSelector
 || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector
 || Ptr == 0) && "Not a selector!") ? void (0) : __assert_fail
 ("(getNameKind() == ObjCZeroArgSelector || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector || Ptr == 0) && \"Not a selector!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 278, __extension__ __PRETTY_FUNCTION__))
          getNameKind() == ObjCMultiArgSelector ||(static_cast <bool> ((getNameKind() == ObjCZeroArgSelector
 || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector
 || Ptr == 0) && "Not a selector!") ? void (0) : __assert_fail
 ("(getNameKind() == ObjCZeroArgSelector || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector || Ptr == 0) && \"Not a selector!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 278, __extension__ __PRETTY_FUNCTION__))
          Ptr == 0) && "Not a selector!")(static_cast <bool> ((getNameKind() == ObjCZeroArgSelector
 || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector
 || Ptr == 0) && "Not a selector!") ? void (0) : __assert_fail
 ("(getNameKind() == ObjCZeroArgSelector || getNameKind() == ObjCOneArgSelector || getNameKind() == ObjCMultiArgSelector || Ptr == 0) && \"Not a selector!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 278, __extension__ __PRETTY_FUNCTION__));
  return Selector(Ptr);
}

/// getFETokenInfo/setFETokenInfo - The language front-end is
/// allowed to associate arbitrary metadata with some kinds of
/// declaration names, including normal identifiers and C++
/// constructors, destructors, and conversion functions.
template<typename T>
T *getFETokenInfo() const {
  if (const IdentifierInfo *Info = getAsIdentifierInfo())
    return Info->getFETokenInfo<T>();
  return static_cast<T*>(getFETokenInfoAsVoidSlow());
}

void setFETokenInfo(void *T);

/// operator== - Determine whether the specified names are identical..
friend bool operator==(DeclarationName LHS, DeclarationName RHS) {
  return LHS.Ptr == RHS.Ptr;
}

/// operator!= - Determine whether the specified names are different.
friend bool operator!=(DeclarationName LHS, DeclarationName RHS) {
  return LHS.Ptr != RHS.Ptr;
}

static DeclarationName getEmptyMarker() {
  return DeclarationName(uintptr_t(-1));
}

static DeclarationName getTombstoneMarker() {
  return DeclarationName(uintptr_t(-2));
}

static int compare(DeclarationName LHS, DeclarationName RHS);

void print(raw_ostream &OS, const PrintingPolicy &Policy);

void dump() const;
318};

320raw_ostream &operator<<(raw_ostream &OS, DeclarationName N);

322/// Ordering on two declaration names. If both names are identifiers,
323/// this provides a lexicographical ordering.
324inline bool operator<(DeclarationName LHS, DeclarationName RHS) {
return DeclarationName::compare(LHS, RHS) < 0;
326}

328/// Ordering on two declaration names. If both names are identifiers,
329/// this provides a lexicographical ordering.
330inline bool operator>(DeclarationName LHS, DeclarationName RHS) {
return DeclarationName::compare(LHS, RHS) > 0;
332}

334/// Ordering on two declaration names. If both names are identifiers,
335/// this provides a lexicographical ordering.
336inline bool operator<=(DeclarationName LHS, DeclarationName RHS) {
return DeclarationName::compare(LHS, RHS) <= 0;
338}

340/// Ordering on two declaration names. If both names are identifiers,
341/// this provides a lexicographical ordering.
342inline bool operator>=(DeclarationName LHS, DeclarationName RHS) {
return DeclarationName::compare(LHS, RHS) >= 0;
344}

346/// DeclarationNameTable - Used to store and retrieve DeclarationName
347/// instances for the various kinds of declaration names, e.g., normal
348/// identifiers, C++ constructor names, etc. This class contains
349/// uniqued versions of each of the C++ special names, which can be
350/// retrieved using its member functions (e.g.,
351/// getCXXConstructorName).
352class DeclarationNameTable {
const ASTContext &Ctx;

// Actually a FoldingSet<CXXSpecialName> *
void *CXXSpecialNamesImpl;

// Operator names
CXXOperatorIdName *CXXOperatorNames;

// Actually a CXXOperatorIdName*
void *CXXLiteralOperatorNames;

// FoldingSet<CXXDeductionGuideNameExtra> *
void *CXXDeductionGuideNames;

367public:
DeclarationNameTable(const ASTContext &C);
DeclarationNameTable(const DeclarationNameTable &) = delete;
DeclarationNameTable &operator=(const DeclarationNameTable &) = delete;

~DeclarationNameTable();

/// getIdentifier - Create a declaration name that is a simple
/// identifier.
DeclarationName getIdentifier(const IdentifierInfo *ID) {
  return DeclarationName(ID);
}

/// getCXXConstructorName - Returns the name of a C++ constructor
/// for the given Type.
DeclarationName getCXXConstructorName(CanQualType Ty);

/// getCXXDestructorName - Returns the name of a C++ destructor
/// for the given Type.
DeclarationName getCXXDestructorName(CanQualType Ty);

/// Returns the name of a C++ deduction guide for the given template.
DeclarationName getCXXDeductionGuideName(TemplateDecl *TD);

/// getCXXConversionFunctionName - Returns the name of a C++
/// conversion function for the given Type.
DeclarationName getCXXConversionFunctionName(CanQualType Ty);

/// getCXXSpecialName - Returns a declaration name for special kind
/// of C++ name, e.g., for a constructor, destructor, or conversion
/// function.
DeclarationName getCXXSpecialName(DeclarationName::NameKind Kind,
                                  CanQualType Ty);

/// getCXXOperatorName - Get the name of the overloadable C++
/// operator corresponding to Op.
DeclarationName getCXXOperatorName(OverloadedOperatorKind Op);

/// getCXXLiteralOperatorName - Get the name of the literal operator function
/// with II as the identifier.
DeclarationName getCXXLiteralOperatorName(IdentifierInfo *II);
408};

410/// DeclarationNameLoc - Additional source/type location info
411/// for a declaration name. Needs a DeclarationName in order
412/// to be interpreted correctly.
413struct DeclarationNameLoc {
// The source location for identifier stored elsewhere.
// struct {} Identifier;

// Type info for constructors, destructors and conversion functions.
// Locations (if any) for the tilde (destructor) or operator keyword
// (conversion) are stored elsewhere.
struct NT {
  TypeSourceInfo *TInfo;
};

// The location (if any) of the operator keyword is stored elsewhere.
struct CXXOpName {
  unsigned BeginOpNameLoc;
  unsigned EndOpNameLoc;
};

// The location (if any) of the operator keyword is stored elsewhere.
struct CXXLitOpName {
  unsigned OpNameLoc;
};

// struct {} CXXUsingDirective;
// struct {} ObjCZeroArgSelector;
// struct {} ObjCOneArgSelector;
// struct {} ObjCMultiArgSelector;
union {
  struct NT NamedType;
  struct CXXOpName CXXOperatorName;
  struct CXXLitOpName CXXLiteralOperatorName;
};

DeclarationNameLoc(DeclarationName Name);

// FIXME: this should go away once all DNLocs are properly initialized.
DeclarationNameLoc() { memset((void*) this, 0, sizeof(*this)); }
449};

451/// DeclarationNameInfo - A collector data type for bundling together
452/// a DeclarationName and the correspnding source/type location info.
453struct DeclarationNameInfo {
454private:
/// Name - The declaration name, also encoding name kind.
DeclarationName Name;

/// Loc - The main source location for the declaration name.
SourceLocation NameLoc;

/// Info - Further source/type location info for special kinds of names.
DeclarationNameLoc LocInfo;

464public:
// FIXME: remove it.
DeclarationNameInfo() = default;

DeclarationNameInfo(DeclarationName Name, SourceLocation NameLoc)
    : Name(Name), NameLoc(NameLoc), LocInfo(Name) {}

DeclarationNameInfo(DeclarationName Name, SourceLocation NameLoc,
                    DeclarationNameLoc LocInfo)
    : Name(Name), NameLoc(NameLoc), LocInfo(LocInfo) {}

/// getName - Returns the embedded declaration name.
DeclarationName getName() const { return Name; }

/// setName - Sets the embedded declaration name.
void setName(DeclarationName N) { Name = N; }

/// getLoc - Returns the main location of the declaration name.
SourceLocation getLoc() const { return NameLoc; }

/// setLoc - Sets the main location of the declaration name.
void setLoc(SourceLocation L) { NameLoc = L; }

const DeclarationNameLoc &getInfo() const { return LocInfo; }
DeclarationNameLoc &getInfo() { return LocInfo; }
void setInfo(const DeclarationNameLoc &Info) { LocInfo = Info; }

/// getNamedTypeInfo - Returns the source type info associated to
/// the name. Assumes it is a constructor, destructor or conversion.
TypeSourceInfo *getNamedTypeInfo() const {
  assert(Name.getNameKind() == DeclarationName::CXXConstructorName ||(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 496, __extension__ __PRETTY_FUNCTION__))
         Name.getNameKind() == DeclarationName::CXXDestructorName ||(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 496, __extension__ __PRETTY_FUNCTION__))
         Name.getNameKind() == DeclarationName::CXXConversionFunctionName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 496, __extension__ __PRETTY_FUNCTION__));
  return LocInfo.NamedType.TInfo;
}

/// setNamedTypeInfo - Sets the source type info associated to
/// the name. Assumes it is a constructor, destructor or conversion.
void setNamedTypeInfo(TypeSourceInfo *TInfo) {
  assert(Name.getNameKind() == DeclarationName::CXXConstructorName ||(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 505, __extension__ __PRETTY_FUNCTION__))
         Name.getNameKind() == DeclarationName::CXXDestructorName ||(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 505, __extension__ __PRETTY_FUNCTION__))
         Name.getNameKind() == DeclarationName::CXXConversionFunctionName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXConstructorName || Name.getNameKind() == DeclarationName
::CXXDestructorName || Name.getNameKind() == DeclarationName::
CXXConversionFunctionName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXConstructorName || Name.getNameKind() == DeclarationName::CXXDestructorName || Name.getNameKind() == DeclarationName::CXXConversionFunctionName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 505, __extension__ __PRETTY_FUNCTION__));
  LocInfo.NamedType.TInfo = TInfo;
}

/// getCXXOperatorNameRange - Gets the range of the operator name
/// (without the operator keyword). Assumes it is a (non-literal) operator.
SourceRange getCXXOperatorNameRange() const {
  assert(Name.getNameKind() == DeclarationName::CXXOperatorName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXOperatorName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXOperatorName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 512, __extension__ __PRETTY_FUNCTION__));
  return SourceRange(
   SourceLocation::getFromRawEncoding(LocInfo.CXXOperatorName.BeginOpNameLoc),
   SourceLocation::getFromRawEncoding(LocInfo.CXXOperatorName.EndOpNameLoc)
                     );
}

/// setCXXOperatorNameRange - Sets the range of the operator name
/// (without the operator keyword). Assumes it is a C++ operator.
void setCXXOperatorNameRange(SourceRange R) {
  assert(Name.getNameKind() == DeclarationName::CXXOperatorName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXOperatorName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXOperatorName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 522, __extension__ __PRETTY_FUNCTION__));
  LocInfo.CXXOperatorName.BeginOpNameLoc = R.getBegin().getRawEncoding();
  LocInfo.CXXOperatorName.EndOpNameLoc = R.getEnd().getRawEncoding();
}

/// getCXXLiteralOperatorNameLoc - Returns the location of the literal
/// operator name (not the operator keyword).
/// Assumes it is a literal operator.
SourceLocation getCXXLiteralOperatorNameLoc() const {
  assert(Name.getNameKind() == DeclarationName::CXXLiteralOperatorName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXLiteralOperatorName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXLiteralOperatorName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 531, __extension__ __PRETTY_FUNCTION__));
  return SourceLocation::
    getFromRawEncoding(LocInfo.CXXLiteralOperatorName.OpNameLoc);
}

/// setCXXLiteralOperatorNameLoc - Sets the location of the literal
/// operator name (not the operator keyword).
/// Assumes it is a literal operator.
void setCXXLiteralOperatorNameLoc(SourceLocation Loc) {
  assert(Name.getNameKind() == DeclarationName::CXXLiteralOperatorName)(static_cast <bool> (Name.getNameKind() == DeclarationName
::CXXLiteralOperatorName) ? void (0) : __assert_fail ("Name.getNameKind() == DeclarationName::CXXLiteralOperatorName"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/AST/DeclarationName.h"
, 540, __extension__ __PRETTY_FUNCTION__));
  LocInfo.CXXLiteralOperatorName.OpNameLoc = Loc.getRawEncoding();
}

/// \brief Determine whether this name involves a template parameter.
bool isInstantiationDependent() const;

/// \brief Determine whether this name contains an unexpanded
/// parameter pack.
bool containsUnexpandedParameterPack() const;

/// getAsString - Retrieve the human-readable string for this name.
std::string getAsString() const;

/// printName - Print the human-readable name to a stream.
void printName(raw_ostream &OS) const;

/// getBeginLoc - Retrieve the location of the first token.
SourceLocation getBeginLoc() const { return NameLoc; }

/// getEndLoc - Retrieve the location of the last token.
SourceLocation getEndLoc() const;

/// getSourceRange - The range of the declaration name.
SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(getLocStart(), getLocEnd());
}

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

SourceLocation getLocEnd() const LLVM_READONLY__attribute__((__pure__)) {
  SourceLocation EndLoc = getEndLoc();
  return EndLoc.isValid() ? EndLoc : getLocStart();
}
576};

578/// Insertion operator for diagnostics.  This allows sending DeclarationName's
579/// into a diagnostic with <<.
580inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                         DeclarationName N) {
DB.AddTaggedVal(N.getAsOpaqueInteger(),
                DiagnosticsEngine::ak_declarationname);
return DB;
585}

587/// Insertion operator for partial diagnostics.  This allows binding
588/// DeclarationName's into a partial diagnostic with <<.
589inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                         DeclarationName N) {
PD.AddTaggedVal(N.getAsOpaqueInteger(),
10
←
Calling 'PartialDiagnostic::AddTaggedVal'→
21
←
Returned allocated memory→
                DiagnosticsEngine::ak_declarationname);
return PD;
594}

596inline raw_ostream &operator<<(raw_ostream &OS,
                                   DeclarationNameInfo DNInfo) {
DNInfo.printName(OS);
return OS;
600}

602} // namespace clang

604namespace llvm {

606/// Define DenseMapInfo so that DeclarationNames can be used as keys
607/// in DenseMap and DenseSets.
608template<>
609struct DenseMapInfo<clang::DeclarationName> {
static inline clang::DeclarationName getEmptyKey() {
  return clang::DeclarationName::getEmptyMarker();
}

static inline clang::DeclarationName getTombstoneKey() {
  return clang::DeclarationName::getTombstoneMarker();
}

static unsigned getHashValue(clang::DeclarationName Name) {
  return DenseMapInfo<void*>::getHashValue(Name.getAsOpaquePtr());
}

static inline bool
isEqual(clang::DeclarationName LHS, clang::DeclarationName RHS) {
  return LHS == RHS;
}
626};

628template <>
629struct isPodLike<clang::DeclarationName> { static const bool value = true; };

631} // namespace llvm

633#endif // LLVM_CLANG_AST_DECLARATIONNAME_H

←

/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h

→

1//===- PartialDiagnostic.h - Diagnostic "closures" --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10/// \file
11/// \brief Implements a partial diagnostic that can be emitted anwyhere
12/// in a DiagnosticBuilder stream.
13//
14//===----------------------------------------------------------------------===//

16#ifndef LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H
17#define LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H

19#include "clang/Basic/Diagnostic.h"
20#include "clang/Basic/LLVM.h"
21#include "clang/Basic/SourceLocation.h"
22#include "llvm/ADT/SmallVector.h"
23#include "llvm/ADT/StringRef.h"
24#include <cassert>
25#include <cstdint>
26#include <string>
27#include <type_traits>
28#include <utility>

30namespace clang {

32class DeclContext;
33class IdentifierInfo;

35class PartialDiagnostic {
36public:
enum {
    // The MaxArguments and MaxFixItHints member enum values from
    // DiagnosticsEngine are private but DiagnosticsEngine declares
    // PartialDiagnostic a friend.  These enum values are redeclared
    // here so that the nested Storage class below can access them.
    MaxArguments = DiagnosticsEngine::MaxArguments
};

struct Storage {
  enum {
      /// \brief The maximum number of arguments we can hold. We
      /// currently only support up to 10 arguments (%0-%9).
      ///
      /// A single diagnostic with more than that almost certainly has to
      /// be simplified anyway.
      MaxArguments = PartialDiagnostic::MaxArguments
  };

  /// \brief The number of entries in Arguments.
  unsigned char NumDiagArgs = 0;

  /// \brief Specifies for each argument whether it is in DiagArgumentsStr
  /// or in DiagArguments.
  unsigned char DiagArgumentsKind[MaxArguments];

  /// \brief The values for the various substitution positions.
  ///
  /// This is used when the argument is not an std::string. The specific value
  /// is mangled into an intptr_t and the interpretation depends on exactly
  /// what sort of argument kind it is.
  intptr_t DiagArgumentsVal[MaxArguments];

  /// \brief The values for the various substitution positions that have
  /// string arguments.
  std::string DiagArgumentsStr[MaxArguments];

  /// \brief The list of ranges added to this diagnostic.
  SmallVector<CharSourceRange, 8> DiagRanges;

  /// \brief If valid, provides a hint with some code to insert, remove, or
  /// modify at a particular position.
  SmallVector<FixItHint, 6>  FixItHints;

  Storage() = default;
};

/// \brief An allocator for Storage objects, which uses a small cache to
/// objects, used to reduce malloc()/free() traffic for partial diagnostics.
class StorageAllocator {
  static const unsigned NumCached = 16;
  Storage Cached[NumCached];
  Storage *FreeList[NumCached];
  unsigned NumFreeListEntries;

public:
  StorageAllocator();
  ~StorageAllocator();

  /// \brief Allocate new storage.
  Storage *Allocate() {
    if (NumFreeListEntries == 0)
16
←
Assuming the condition is true→
17
←
Taking true branch→
      return new Storage;
18
←
Memory is allocated→

    Storage *Result = FreeList[--NumFreeListEntries];
    Result->NumDiagArgs = 0;
    Result->DiagRanges.clear();
    Result->FixItHints.clear();
    return Result;
  }

  /// \brief Free the given storage object.
  void Deallocate(Storage *S) {
    if (S >= Cached && S <= Cached + NumCached) {
      FreeList[NumFreeListEntries++] = S;
      return;
    }

    delete S;
  }
};

118private:
// NOTE: Sema assumes that PartialDiagnostic is location-invariant
// in the sense that its bits can be safely memcpy'ed and destructed
// in the new location.

/// \brief The diagnostic ID.
mutable unsigned DiagID = 0;

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

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

/// \brief Retrieve storage for this particular diagnostic.
Storage *getStorage() const {
  if (DiagStorage)
13
←
Taking false branch→
    return DiagStorage;

  if (Allocator)
14
←
Taking true branch→
    DiagStorage = Allocator->Allocate();
15
←
Calling 'StorageAllocator::Allocate'→
19
←
Returned allocated memory→
  else {
    assert(Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))(static_cast <bool> (Allocator != reinterpret_cast<StorageAllocator
 *>(~uintptr_t(0))) ? void (0) : __assert_fail ("Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0))"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 140, __extension__ __PRETTY_FUNCTION__));
    DiagStorage = new Storage;
  }
  return DiagStorage;
}

void freeStorage() {
  if (!DiagStorage)
    return;

  // The hot path for PartialDiagnostic is when we just used it to wrap an ID
  // (typically so we have the flexibility of passing a more complex
  // diagnostic into the callee, but that does not commonly occur).
  //
  // Split this out into a slow function for silly compilers (*cough*) which
  // can't do decent partial inlining.
  freeStorageSlow();
}

void freeStorageSlow() {
  if (Allocator)
    Allocator->Deallocate(DiagStorage);
  else if (Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))
    delete DiagStorage;
  DiagStorage = nullptr;
}

void AddSourceRange(const CharSourceRange &R) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->DiagRanges.push_back(R);
}

void AddFixItHint(const FixItHint &Hint) const {
  if (Hint.isNull())
    return;

  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->FixItHints.push_back(Hint);
}

184public:
struct NullDiagnostic {};

/// \brief Create a null partial diagnostic, which cannot carry a payload,
/// and only exists to be swapped with a real partial diagnostic.
PartialDiagnostic(NullDiagnostic) {}

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

PartialDiagnostic(const PartialDiagnostic &Other)
    : DiagID(Other.DiagID), Allocator(Other.Allocator) {
  if (Other.DiagStorage) {
    DiagStorage = getStorage();
    *DiagStorage = *Other.DiagStorage;
  }
}

PartialDiagnostic(PartialDiagnostic &&Other)
    : DiagID(Other.DiagID), DiagStorage(Other.DiagStorage),
      Allocator(Other.Allocator) {
25
←
Potential leak of memory pointed to by field 'DiagStorage'
  Other.DiagStorage = nullptr;
}

PartialDiagnostic(const PartialDiagnostic &Other, Storage *DiagStorage)
    : DiagID(Other.DiagID), DiagStorage(DiagStorage),
      Allocator(reinterpret_cast<StorageAllocator *>(~uintptr_t(0))) {
  if (Other.DiagStorage)
    *this->DiagStorage = *Other.DiagStorage;
}

PartialDiagnostic(const Diagnostic &Other, StorageAllocator &Allocator)
    : DiagID(Other.getID()), Allocator(&Allocator) {
  // Copy arguments.
  for (unsigned I = 0, N = Other.getNumArgs(); I != N; ++I) {
    if (Other.getArgKind(I) == DiagnosticsEngine::ak_std_string)
      AddString(Other.getArgStdStr(I));
    else
      AddTaggedVal(Other.getRawArg(I), Other.getArgKind(I));
  }

  // Copy source ranges.
  for (unsigned I = 0, N = Other.getNumRanges(); I != N; ++I)
    AddSourceRange(Other.getRange(I));

  // Copy fix-its.
  for (unsigned I = 0, N = Other.getNumFixItHints(); I != N; ++I)
    AddFixItHint(Other.getFixItHint(I));
}

PartialDiagnostic &operator=(const PartialDiagnostic &Other) {
  DiagID = Other.DiagID;
  if (Other.DiagStorage) {
    if (!DiagStorage)
      DiagStorage = getStorage();

    *DiagStorage = *Other.DiagStorage;
  } else {
    freeStorage();
  }

  return *this;
}

PartialDiagnostic &operator=(PartialDiagnostic &&Other) {
  freeStorage();

  DiagID = Other.DiagID;
  DiagStorage = Other.DiagStorage;
  Allocator = Other.Allocator;

  Other.DiagStorage = nullptr;
  return *this;
}

~PartialDiagnostic() {
  freeStorage();
}

void swap(PartialDiagnostic &PD) {
  std::swap(DiagID, PD.DiagID);
  std::swap(DiagStorage, PD.DiagStorage);
  std::swap(Allocator, PD.Allocator);
}

unsigned getDiagID() const { return DiagID; }

void AddTaggedVal(intptr_t V, DiagnosticsEngine::ArgumentKind Kind) const {
  if (!DiagStorage)
11
←
Taking true branch→
    DiagStorage = getStorage();
12
←
Calling 'PartialDiagnostic::getStorage'→
20
←
Returned allocated memory→

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs] = Kind;
  DiagStorage->DiagArgumentsVal[DiagStorage->NumDiagArgs++] = V;
}

void AddString(StringRef V) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs]
    = DiagnosticsEngine::ak_std_string;
  DiagStorage->DiagArgumentsStr[DiagStorage->NumDiagArgs++] = V;
}

void Emit(const DiagnosticBuilder &DB) const {
  if (!DiagStorage)
    return;

  // Add all arguments.
  for (unsigned i = 0, e = DiagStorage->NumDiagArgs; i != e; ++i) {
    if ((DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]
          == DiagnosticsEngine::ak_std_string)
      DB.AddString(DiagStorage->DiagArgumentsStr[i]);
    else
      DB.AddTaggedVal(DiagStorage->DiagArgumentsVal[i],
          (DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]);
  }

  // Add all ranges.
  for (const CharSourceRange &Range : DiagStorage->DiagRanges)
    DB.AddSourceRange(Range);

  // Add all fix-its.
  for (const FixItHint &Fix : DiagStorage->FixItHints)
    DB.AddFixItHint(Fix);
}

void EmitToString(DiagnosticsEngine &Diags,
                  SmallVectorImpl<char> &Buf) const {
  // FIXME: It should be possible to render a diagnostic to a string without
  //        messing with the state of the diagnostics engine.
  DiagnosticBuilder DB(Diags.Report(getDiagID()));
  Emit(DB);
  DB.FlushCounts();
  Diagnostic(&Diags).FormatDiagnostic(Buf);
  DB.Clear();
  Diags.Clear();
}

/// \brief Clear out this partial diagnostic, giving it a new diagnostic ID
/// and removing all of its arguments, ranges, and fix-it hints.
void Reset(unsigned DiagID = 0) {
  this->DiagID = DiagID;
  freeStorage();
}

bool hasStorage() const { return DiagStorage != nullptr; }

/// Retrieve the string argument at the given index.
StringRef getStringArg(unsigned I) {
  assert(DiagStorage && "No diagnostic storage?")(static_cast <bool> (DiagStorage && "No diagnostic storage?"
) ? void (0) : __assert_fail ("DiagStorage && \"No diagnostic storage?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 338, __extension__ __PRETTY_FUNCTION__));
  assert(I < DiagStorage->NumDiagArgs && "Not enough diagnostic args")(static_cast <bool> (I < DiagStorage->NumDiagArgs
 && "Not enough diagnostic args") ? void (0) : __assert_fail
 ("I < DiagStorage->NumDiagArgs && \"Not enough diagnostic args\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 339, __extension__ __PRETTY_FUNCTION__));
  assert(DiagStorage->DiagArgumentsKind[I](static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __extension__ __PRETTY_FUNCTION__))
           == DiagnosticsEngine::ak_std_string && "Not a string arg")(static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __extension__ __PRETTY_FUNCTION__));
  return DiagStorage->DiagArgumentsStr[I];
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           unsigned I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_uint);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           int I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_sint);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const char *S) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(S),
                  DiagnosticsEngine::ak_c_string);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  StringRef S) {

  PD.AddString(S);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const IdentifierInfo *II) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(II),
                  DiagnosticsEngine::ak_identifierinfo);
  return PD;
}

// Adds a DeclContext to the diagnostic. The enable_if template magic is here
// so that we only match those arguments that are (statically) DeclContexts;
// other arguments that derive from DeclContext (e.g., RecordDecls) will not
// match.
template<typename T>
friend inline
typename std::enable_if<std::is_same<T, DeclContext>::value,
                        const PartialDiagnostic &>::type
operator<<(const PartialDiagnostic &PD, T *DC) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(DC),
                  DiagnosticsEngine::ak_declcontext);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  SourceRange R) {
  PD.AddSourceRange(CharSourceRange::getTokenRange(R));
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const CharSourceRange &R) {
  PD.AddSourceRange(R);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           const FixItHint &Hint) {
  PD.AddFixItHint(Hint);
  return PD;
}
409};

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

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

421} // namespace clang

423#endif // LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H

←

/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Sema/SemaInternal.h

1//===--- SemaInternal.h - Internal Sema Interfaces --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file provides common API and #includes for the internal
11// implementation of Sema.
12//
13//===----------------------------------------------------------------------===//

15#ifndef LLVM_CLANG_SEMA_SEMAINTERNAL_H
16#define LLVM_CLANG_SEMA_SEMAINTERNAL_H

18#include "clang/AST/ASTContext.h"
19#include "clang/Sema/Lookup.h"
20#include "clang/Sema/Sema.h"
21#include "clang/Sema/SemaDiagnostic.h"

23namespace clang {

25inline PartialDiagnostic Sema::PDiag(unsigned DiagID) {
return PartialDiagnostic(DiagID, Context.getDiagAllocator());
24
←
Calling move constructor for 'PartialDiagnostic'→
27}

29inline bool
30FTIHasSingleVoidParameter(const DeclaratorChunk::FunctionTypeInfo &FTI) {
return FTI.NumParams == 1 && !FTI.isVariadic &&
       FTI.Params[0].Ident == nullptr && FTI.Params[0].Param &&
       cast<ParmVarDecl>(FTI.Params[0].Param)->getType()->isVoidType();
34}

36inline bool
37FTIHasNonVoidParameters(const DeclaratorChunk::FunctionTypeInfo &FTI) {
// Assume FTI is well-formed.
return FTI.NumParams && !FTIHasSingleVoidParameter(FTI);
40}

42// This requires the variable to be non-dependent and the initializer
43// to not be value dependent.
44inline bool IsVariableAConstantExpression(VarDecl *Var, ASTContext &Context) {
const VarDecl *DefVD = nullptr;
return !isa<ParmVarDecl>(Var) &&
  Var->isUsableInConstantExpressions(Context) &&
  Var->getAnyInitializer(DefVD) && DefVD->checkInitIsICE(); 
49}

51// Helper function to check whether D's attributes match current CUDA mode.
52// Decls with mismatched attributes and related diagnostics may have to be
53// ignored during this CUDA compilation pass.
54inline bool DeclAttrsMatchCUDAMode(const LangOptions &LangOpts, Decl *D) {
if (!LangOpts.CUDA || !D)
  return true;
bool isDeviceSideDecl = D->hasAttr<CUDADeviceAttr>() ||
                        D->hasAttr<CUDASharedAttr>() ||
                        D->hasAttr<CUDAGlobalAttr>();
return isDeviceSideDecl == LangOpts.CUDAIsDevice;
61}

63// Directly mark a variable odr-used. Given a choice, prefer to use 
64// MarkVariableReferenced since it does additional checks and then 
65// calls MarkVarDeclODRUsed.
66// If the variable must be captured:
67//  - if FunctionScopeIndexToStopAt is null, capture it in the CurContext
68//  - else capture it in the DeclContext that maps to the 
69//    *FunctionScopeIndexToStopAt on the FunctionScopeInfo stack.  
70inline void MarkVarDeclODRUsed(VarDecl *Var,
  SourceLocation Loc, Sema &SemaRef,
  const unsigned *const FunctionScopeIndexToStopAt) {
// Keep track of used but undefined variables.
// FIXME: We shouldn't suppress this warning for static data members.
if (Var->hasDefinition(SemaRef.Context) == VarDecl::DeclarationOnly &&
    (!Var->isExternallyVisible() || Var->isInline() ||
     SemaRef.isExternalWithNoLinkageType(Var)) &&
    !(Var->isStaticDataMember() && Var->hasInit())) {
  SourceLocation &old = SemaRef.UndefinedButUsed[Var->getCanonicalDecl()];
  if (old.isInvalid())
    old = Loc;
}
QualType CaptureType, DeclRefType;
SemaRef.tryCaptureVariable(Var, Loc, Sema::TryCapture_Implicit, 
  /*EllipsisLoc*/ SourceLocation(),
  /*BuildAndDiagnose*/ true, 
  CaptureType, DeclRefType, 
  FunctionScopeIndexToStopAt);

Var->markUsed(SemaRef.Context);
91}

93/// Return a DLL attribute from the declaration.
94inline InheritableAttr *getDLLAttr(Decl *D) {
assert(!(D->hasAttr<DLLImportAttr>() && D->hasAttr<DLLExportAttr>()) &&(static_cast <bool> (!(D->hasAttr<DLLImportAttr>
() && D->hasAttr<DLLExportAttr>()) &&
 "A declaration cannot be both dllimport and dllexport.") ? void
 (0) : __assert_fail ("!(D->hasAttr<DLLImportAttr>() && D->hasAttr<DLLExportAttr>()) && \"A declaration cannot be both dllimport and dllexport.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Sema/SemaInternal.h"
, 96, __extension__ __PRETTY_FUNCTION__))
       "A declaration cannot be both dllimport and dllexport.")(static_cast <bool> (!(D->hasAttr<DLLImportAttr>
() && D->hasAttr<DLLExportAttr>()) &&
 "A declaration cannot be both dllimport and dllexport.") ? void
 (0) : __assert_fail ("!(D->hasAttr<DLLImportAttr>() && D->hasAttr<DLLExportAttr>()) && \"A declaration cannot be both dllimport and dllexport.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Sema/SemaInternal.h"
, 96, __extension__ __PRETTY_FUNCTION__));
if (auto *Import = D->getAttr<DLLImportAttr>())
  return Import;
if (auto *Export = D->getAttr<DLLExportAttr>())
  return Export;
return nullptr;
102}

104class TypoCorrectionConsumer : public VisibleDeclConsumer {
typedef SmallVector<TypoCorrection, 1> TypoResultList;
typedef llvm::StringMap<TypoResultList> TypoResultsMap;
typedef std::map<unsigned, TypoResultsMap> TypoEditDistanceMap;

109public:
TypoCorrectionConsumer(Sema &SemaRef,
                       const DeclarationNameInfo &TypoName,
                       Sema::LookupNameKind LookupKind,
                       Scope *S, CXXScopeSpec *SS,
                       std::unique_ptr<CorrectionCandidateCallback> CCC,
                       DeclContext *MemberContext,
                       bool EnteringContext)
    : Typo(TypoName.getName().getAsIdentifierInfo()), CurrentTCIndex(0),
      SavedTCIndex(0), SemaRef(SemaRef), S(S),
      SS(SS ? llvm::make_unique<CXXScopeSpec>(*SS) : nullptr),
      CorrectionValidator(std::move(CCC)), MemberContext(MemberContext),
      Result(SemaRef, TypoName, LookupKind),
      Namespaces(SemaRef.Context, SemaRef.CurContext, SS),
      EnteringContext(EnteringContext), SearchNamespaces(false) {
  Result.suppressDiagnostics();
  // Arrange for ValidatedCorrections[0] to always be an empty correction.
  ValidatedCorrections.push_back(TypoCorrection());
}

bool includeHiddenDecls() const override { return true; }

// Methods for adding potential corrections to the consumer.
void FoundDecl(NamedDecl *ND, NamedDecl *Hiding, DeclContext *Ctx,
               bool InBaseClass) override;
void FoundName(StringRef Name);
void addKeywordResult(StringRef Keyword);
void addCorrection(TypoCorrection Correction);

bool empty() const {
  return CorrectionResults.empty() && ValidatedCorrections.size() == 1;
}

/// \brief Return the list of TypoCorrections for the given identifier from
/// the set of corrections that have the closest edit distance, if any.
TypoResultList &operator[](StringRef Name) {
  return CorrectionResults.begin()->second[Name];
}

/// \brief Return the edit distance of the corrections that have the
/// closest/best edit distance from the original typop.
unsigned getBestEditDistance(bool Normalized) {
  if (CorrectionResults.empty())
    return (std::numeric_limits<unsigned>::max)();

  unsigned BestED = CorrectionResults.begin()->first;
  return Normalized ? TypoCorrection::NormalizeEditDistance(BestED) : BestED;
}

/// \brief Set-up method to add to the consumer the set of namespaces to use
/// in performing corrections to nested name specifiers. This method also
/// implicitly adds all of the known classes in the current AST context to the
/// to the consumer for correcting nested name specifiers.
void
addNamespaces(const llvm::MapVector<NamespaceDecl *, bool> &KnownNamespaces);

/// \brief Return the next typo correction that passes all internal filters
/// and is deemed valid by the consumer's CorrectionCandidateCallback,
/// starting with the corrections that have the closest edit distance. An
/// empty TypoCorrection is returned once no more viable corrections remain
/// in the consumer.
const TypoCorrection &getNextCorrection();

/// \brief Get the last correction returned by getNextCorrection().
const TypoCorrection &getCurrentCorrection() {
  return CurrentTCIndex < ValidatedCorrections.size()
             ? ValidatedCorrections[CurrentTCIndex]
             : ValidatedCorrections[0];  // The empty correction.
}

/// \brief Return the next typo correction like getNextCorrection, but keep
/// the internal state pointed to the current correction (i.e. the next time
/// getNextCorrection is called, it will return the same correction returned
/// by peekNextcorrection).
const TypoCorrection &peekNextCorrection() {
  auto Current = CurrentTCIndex;
  const TypoCorrection &TC = getNextCorrection();
  CurrentTCIndex = Current;
  return TC;
}

/// \brief Reset the consumer's position in the stream of viable corrections
/// (i.e. getNextCorrection() will return each of the previously returned
/// corrections in order before returning any new corrections).
void resetCorrectionStream() {
  CurrentTCIndex = 0;
}

/// \brief Return whether the end of the stream of corrections has been
/// reached.
bool finished() {
  return CorrectionResults.empty() &&
         CurrentTCIndex >= ValidatedCorrections.size();
}

/// \brief Save the current position in the correction stream (overwriting any
/// previously saved position).
void saveCurrentPosition() {
  SavedTCIndex = CurrentTCIndex;
}

/// \brief Restore the saved position in the correction stream.
void restoreSavedPosition() {
  CurrentTCIndex = SavedTCIndex;
}

ASTContext &getContext() const { return SemaRef.Context; }
const LookupResult &getLookupResult() const { return Result; }

bool isAddressOfOperand() const { return CorrectionValidator->IsAddressOfOperand; }
const CXXScopeSpec *getSS() const { return SS.get(); }
Scope *getScope() const { return S; }
CorrectionCandidateCallback *getCorrectionValidator() const {
  return CorrectionValidator.get();
}

225private:
class NamespaceSpecifierSet {
  struct SpecifierInfo {
    DeclContext* DeclCtx;
    NestedNameSpecifier* NameSpecifier;
    unsigned EditDistance;
  };

  typedef SmallVector<DeclContext*, 4> DeclContextList;
  typedef SmallVector<SpecifierInfo, 16> SpecifierInfoList;

  ASTContext &Context;
  DeclContextList CurContextChain;
  std::string CurNameSpecifier;
  SmallVector<const IdentifierInfo*, 4> CurContextIdentifiers;
  SmallVector<const IdentifierInfo*, 4> CurNameSpecifierIdentifiers;

  std::map<unsigned, SpecifierInfoList> DistanceMap;

  /// \brief Helper for building the list of DeclContexts between the current
  /// context and the top of the translation unit
  static DeclContextList buildContextChain(DeclContext *Start);

  unsigned buildNestedNameSpecifier(DeclContextList &DeclChain,
                                    NestedNameSpecifier *&NNS);

 public:
  NamespaceSpecifierSet(ASTContext &Context, DeclContext *CurContext,
                        CXXScopeSpec *CurScopeSpec);

  /// \brief Add the DeclContext (a namespace or record) to the set, computing
  /// the corresponding NestedNameSpecifier and its distance in the process.
  void addNameSpecifier(DeclContext *Ctx);

  /// \brief Provides flat iteration over specifiers, sorted by distance.
  class iterator
      : public llvm::iterator_facade_base<iterator, std::forward_iterator_tag,
                                          SpecifierInfo> {
    /// Always points to the last element in the distance map.
    const std::map<unsigned, SpecifierInfoList>::iterator OuterBack;
    /// Iterator on the distance map.
    std::map<unsigned, SpecifierInfoList>::iterator Outer;
    /// Iterator on an element in the distance map.
    SpecifierInfoList::iterator Inner;

  public:
    iterator(NamespaceSpecifierSet &Set, bool IsAtEnd)
        : OuterBack(std::prev(Set.DistanceMap.end())),
          Outer(Set.DistanceMap.begin()),
          Inner(!IsAtEnd ? Outer->second.begin() : OuterBack->second.end()) {
      assert(!Set.DistanceMap.empty())(static_cast <bool> (!Set.DistanceMap.empty()) ? void (
0) : __assert_fail ("!Set.DistanceMap.empty()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include/clang/Sema/SemaInternal.h"
, 275, __extension__ __PRETTY_FUNCTION__));
    }

    iterator &operator++() {
      ++Inner;
      if (Inner == Outer->second.end() && Outer != OuterBack) {
        ++Outer;
        Inner = Outer->second.begin();
      }
      return *this;
    }

    SpecifierInfo &operator*() { return *Inner; }
    bool operator==(const iterator &RHS) const { return Inner == RHS.Inner; }
  };

  iterator begin() { return iterator(*this, /*IsAtEnd=*/false); }
  iterator end() { return iterator(*this, /*IsAtEnd=*/true); }
};

void addName(StringRef Name, NamedDecl *ND,
             NestedNameSpecifier *NNS = nullptr, bool isKeyword = false);

/// \brief Find any visible decls for the given typo correction candidate.
/// If none are found, it to the set of candidates for which qualified lookups
/// will be performed to find possible nested name specifier changes.
bool resolveCorrection(TypoCorrection &Candidate);

/// \brief Perform qualified lookups on the queued set of typo correction
/// candidates and add the nested name specifier changes to each candidate if
/// a lookup succeeds (at which point the candidate will be returned to the
/// main pool of potential corrections).
void performQualifiedLookups();

/// \brief The name written that is a typo in the source.
IdentifierInfo *Typo;

/// \brief The results found that have the smallest edit distance
/// found (so far) with the typo name.
///
/// The pointer value being set to the current DeclContext indicates
/// whether there is a keyword with this name.
TypoEditDistanceMap CorrectionResults;

SmallVector<TypoCorrection, 4> ValidatedCorrections;
size_t CurrentTCIndex;
size_t SavedTCIndex;

Sema &SemaRef;
Scope *S;
std::unique_ptr<CXXScopeSpec> SS;
std::unique_ptr<CorrectionCandidateCallback> CorrectionValidator;
DeclContext *MemberContext;
LookupResult Result;
NamespaceSpecifierSet Namespaces;
SmallVector<TypoCorrection, 2> QualifiedResults;
bool EnteringContext;
bool SearchNamespaces;
333};

335inline Sema::TypoExprState::TypoExprState() {}

337inline Sema::TypoExprState::TypoExprState(TypoExprState &&other) noexcept {
*this = std::move(other);
339}

341inline Sema::TypoExprState &Sema::TypoExprState::
342operator=(Sema::TypoExprState &&other) noexcept {
Consumer = std::move(other.Consumer);
DiagHandler = std::move(other.DiagHandler);
RecoveryHandler = std::move(other.RecoveryHandler);
return *this;
347}

349} // end namespace clang

351#endif