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

Bug Summary

File:	tools/clang/lib/Sema/SemaStmt.cpp
Warning:	line 3837, column 7 Potential leak of memory pointed to by field 'DiagStorage'

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaStmt.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326551/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-03-02-155150-1477-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp

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

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1//===--- SemaStmt.cpp - Semantic Analysis for Statements ------------------===//
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 statements.
11//
12//===----------------------------------------------------------------------===//

14#include "clang/Sema/SemaInternal.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/ASTLambda.h"
18#include "clang/AST/CharUnits.h"
19#include "clang/AST/CXXInheritance.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/EvaluatedExprVisitor.h"
22#include "clang/AST/ExprCXX.h"
23#include "clang/AST/ExprObjC.h"
24#include "clang/AST/RecursiveASTVisitor.h"
25#include "clang/AST/StmtCXX.h"
26#include "clang/AST/StmtObjC.h"
27#include "clang/AST/TypeLoc.h"
28#include "clang/AST/TypeOrdering.h"
29#include "clang/Basic/TargetInfo.h"
30#include "clang/Lex/Preprocessor.h"
31#include "clang/Sema/Initialization.h"
32#include "clang/Sema/Lookup.h"
33#include "clang/Sema/Scope.h"
34#include "clang/Sema/ScopeInfo.h"
35#include "llvm/ADT/ArrayRef.h"
36#include "llvm/ADT/DenseMap.h"
37#include "llvm/ADT/STLExtras.h"
38#include "llvm/ADT/SmallPtrSet.h"
39#include "llvm/ADT/SmallString.h"
40#include "llvm/ADT/SmallVector.h"

42using namespace clang;
43using namespace sema;

45StmtResult Sema::ActOnExprStmt(ExprResult FE) {
if (FE.isInvalid())
  return StmtError();

FE = ActOnFinishFullExpr(FE.get(), FE.get()->getExprLoc(),
                         /*DiscardedValue*/ true);
if (FE.isInvalid())
  return StmtError();

// C99 6.8.3p2: The expression in an expression statement is evaluated as a
// void expression for its side effects.  Conversion to void allows any
// operand, even incomplete types.

// Same thing in for stmt first clause (when expr) and third clause.
return StmtResult(FE.getAs<Stmt>());
60}


63StmtResult Sema::ActOnExprStmtError() {
DiscardCleanupsInEvaluationContext();
return StmtError();
66}

68StmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc,
                             bool HasLeadingEmptyMacro) {
return new (Context) NullStmt(SemiLoc, HasLeadingEmptyMacro);
71}

73StmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, SourceLocation StartLoc,
                             SourceLocation EndLoc) {
DeclGroupRef DG = dg.get();

// If we have an invalid decl, just return an error.
if (DG.isNull()) return StmtError();

return new (Context) DeclStmt(DG, StartLoc, EndLoc);
81}

83void Sema::ActOnForEachDeclStmt(DeclGroupPtrTy dg) {
DeclGroupRef DG = dg.get();

// If we don't have a declaration, or we have an invalid declaration,
// just return.
if (DG.isNull() || !DG.isSingleDecl())
  return;

Decl *decl = DG.getSingleDecl();
if (!decl || decl->isInvalidDecl())
  return;

// Only variable declarations are permitted.
VarDecl *var = dyn_cast<VarDecl>(decl);
if (!var) {
  Diag(decl->getLocation(), diag::err_non_variable_decl_in_for);
  decl->setInvalidDecl();
  return;
}

// foreach variables are never actually initialized in the way that
// the parser came up with.
var->setInit(nullptr);

// In ARC, we don't need to retain the iteration variable of a fast
// enumeration loop.  Rather than actually trying to catch that
// during declaration processing, we remove the consequences here.
if (getLangOpts().ObjCAutoRefCount) {
  QualType type = var->getType();

  // Only do this if we inferred the lifetime.  Inferred lifetime
  // will show up as a local qualifier because explicit lifetime
  // should have shown up as an AttributedType instead.
  if (type.getLocalQualifiers().getObjCLifetime() == Qualifiers::OCL_Strong) {
    // Add 'const' and mark the variable as pseudo-strong.
    var->setType(type.withConst());
    var->setARCPseudoStrong(true);
  }
}
122}

124/// \brief Diagnose unused comparisons, both builtin and overloaded operators.
125/// For '==' and '!=', suggest fixits for '=' or '|='.
126///
127/// Adding a cast to void (or other expression wrappers) will prevent the
128/// warning from firing.
129static bool DiagnoseUnusedComparison(Sema &S, const Expr *E) {
SourceLocation Loc;
bool CanAssign;
enum { Equality, Inequality, Relational, ThreeWay } Kind;

if (const BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
  if (!Op->isComparisonOp())
    return false;

  if (Op->getOpcode() == BO_EQ)
    Kind = Equality;
  else if (Op->getOpcode() == BO_NE)
    Kind = Inequality;
  else if (Op->getOpcode() == BO_Cmp)
    Kind = ThreeWay;
  else {
    assert(Op->isRelationalOp())(static_cast <bool> (Op->isRelationalOp()) ? void (0
) : __assert_fail ("Op->isRelationalOp()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 145, __extension__ __PRETTY_FUNCTION__));
    Kind = Relational;
  }
  Loc = Op->getOperatorLoc();
  CanAssign = Op->getLHS()->IgnoreParenImpCasts()->isLValue();
} else if (const CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
  switch (Op->getOperator()) {
  case OO_EqualEqual:
    Kind = Equality;
    break;
  case OO_ExclaimEqual:
    Kind = Inequality;
    break;
  case OO_Less:
  case OO_Greater:
  case OO_GreaterEqual:
  case OO_LessEqual:
    Kind = Relational;
    break;
  case OO_Spaceship:
    Kind = ThreeWay;
    break;
  default:
    return false;
  }

  Loc = Op->getOperatorLoc();
  CanAssign = Op->getArg(0)->IgnoreParenImpCasts()->isLValue();
} else {
  // Not a typo-prone comparison.
  return false;
}

// Suppress warnings when the operator, suspicious as it may be, comes from
// a macro expansion.
if (S.SourceMgr.isMacroBodyExpansion(Loc))
  return false;

S.Diag(Loc, diag::warn_unused_comparison)
  << (unsigned)Kind << E->getSourceRange();

// If the LHS is a plausible entity to assign to, provide a fixit hint to
// correct common typos.
if (CanAssign) {
  if (Kind == Inequality)
    S.Diag(Loc, diag::note_inequality_comparison_to_or_assign)
      << FixItHint::CreateReplacement(Loc, "|=");
  else if (Kind == Equality)
    S.Diag(Loc, diag::note_equality_comparison_to_assign)
      << FixItHint::CreateReplacement(Loc, "=");
}

return true;
198}

200void Sema::DiagnoseUnusedExprResult(const Stmt *S) {
if (const LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S))
  return DiagnoseUnusedExprResult(Label->getSubStmt());

const Expr *E = dyn_cast_or_null<Expr>(S);
if (!E)
  return;

// If we are in an unevaluated expression context, then there can be no unused
// results because the results aren't expected to be used in the first place.
if (isUnevaluatedContext())
  return;

SourceLocation ExprLoc = E->IgnoreParenImpCasts()->getExprLoc();
// In most cases, we don't want to warn if the expression is written in a
// macro body, or if the macro comes from a system header. If the offending
// expression is a call to a function with the warn_unused_result attribute,
// we warn no matter the location. Because of the order in which the various
// checks need to happen, we factor out the macro-related test here.
bool ShouldSuppress = 
    SourceMgr.isMacroBodyExpansion(ExprLoc) ||
    SourceMgr.isInSystemMacro(ExprLoc);

const Expr *WarnExpr;
SourceLocation Loc;
SourceRange R1, R2;
if (!E->isUnusedResultAWarning(WarnExpr, Loc, R1, R2, Context))
  return;

// If this is a GNU statement expression expanded from a macro, it is probably
// unused because it is a function-like macro that can be used as either an
// expression or statement.  Don't warn, because it is almost certainly a
// false positive.
if (isa<StmtExpr>(E) && Loc.isMacroID())
  return;

// Check if this is the UNREFERENCED_PARAMETER from the Microsoft headers.
// That macro is frequently used to suppress "unused parameter" warnings,
// but its implementation makes clang's -Wunused-value fire.  Prevent this.
if (isa<ParenExpr>(E->IgnoreImpCasts()) && Loc.isMacroID()) {
  SourceLocation SpellLoc = Loc;
  if (findMacroSpelling(SpellLoc, "UNREFERENCED_PARAMETER"))
    return;
}

// Okay, we have an unused result.  Depending on what the base expression is,
// we might want to make a more specific diagnostic.  Check for one of these
// cases now.
unsigned DiagID = diag::warn_unused_expr;
if (const ExprWithCleanups *Temps = dyn_cast<ExprWithCleanups>(E))
  E = Temps->getSubExpr();
if (const CXXBindTemporaryExpr *TempExpr = dyn_cast<CXXBindTemporaryExpr>(E))
  E = TempExpr->getSubExpr();

if (DiagnoseUnusedComparison(*this, E))
  return;

E = WarnExpr;
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
  if (E->getType()->isVoidType())
    return;

  // If the callee has attribute pure, const, or warn_unused_result, warn with
  // a more specific message to make it clear what is happening. If the call
  // is written in a macro body, only warn if it has the warn_unused_result
  // attribute.
  if (const Decl *FD = CE->getCalleeDecl()) {
    if (const Attr *A = isa<FunctionDecl>(FD)
                            ? cast<FunctionDecl>(FD)->getUnusedResultAttr()
                            : FD->getAttr<WarnUnusedResultAttr>()) {
      Diag(Loc, diag::warn_unused_result) << A << R1 << R2;
      return;
    }
    if (ShouldSuppress)
      return;
    if (FD->hasAttr<PureAttr>()) {
      Diag(Loc, diag::warn_unused_call) << R1 << R2 << "pure";
      return;
    }
    if (FD->hasAttr<ConstAttr>()) {
      Diag(Loc, diag::warn_unused_call) << R1 << R2 << "const";
      return;
    }
  }
} else if (ShouldSuppress)
  return;

if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) {
  if (getLangOpts().ObjCAutoRefCount && ME->isDelegateInitCall()) {
    Diag(Loc, diag::err_arc_unused_init_message) << R1;
    return;
  }
  const ObjCMethodDecl *MD = ME->getMethodDecl();
  if (MD) {
    if (const auto *A = MD->getAttr<WarnUnusedResultAttr>()) {
      Diag(Loc, diag::warn_unused_result) << A << R1 << R2;
      return;
    }
  }
} else if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
  const Expr *Source = POE->getSyntacticForm();
  if (isa<ObjCSubscriptRefExpr>(Source))
    DiagID = diag::warn_unused_container_subscript_expr;
  else
    DiagID = diag::warn_unused_property_expr;
} else if (const CXXFunctionalCastExpr *FC
                                     = dyn_cast<CXXFunctionalCastExpr>(E)) {
  const Expr *E = FC->getSubExpr();
  if (const CXXBindTemporaryExpr *TE = dyn_cast<CXXBindTemporaryExpr>(E))
    E = TE->getSubExpr();
  if (isa<CXXTemporaryObjectExpr>(E))
    return;
  if (const CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(E))
    if (const CXXRecordDecl *RD = CE->getType()->getAsCXXRecordDecl())
      if (!RD->getAttr<WarnUnusedAttr>())
        return;
}
// Diagnose "(void*) blah" as a typo for "(void) blah".
else if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E)) {
  TypeSourceInfo *TI = CE->getTypeInfoAsWritten();
  QualType T = TI->getType();

  // We really do want to use the non-canonical type here.
  if (T == Context.VoidPtrTy) {
    PointerTypeLoc TL = TI->getTypeLoc().castAs<PointerTypeLoc>();

    Diag(Loc, diag::warn_unused_voidptr)
      << FixItHint::CreateRemoval(TL.getStarLoc());
    return;
  }
}

if (E->isGLValue() && E->getType().isVolatileQualified()) {
  Diag(Loc, diag::warn_unused_volatile) << R1 << R2;
  return;
}

DiagRuntimeBehavior(Loc, nullptr, PDiag(DiagID) << R1 << R2);
338}

340void Sema::ActOnStartOfCompoundStmt(bool IsStmtExpr) {
PushCompoundScope(IsStmtExpr);
342}

344void Sema::ActOnFinishOfCompoundStmt() {
PopCompoundScope();
346}

348sema::CompoundScopeInfo &Sema::getCurCompoundScope() const {
return getCurFunction()->CompoundScopes.back();
350}

352StmtResult Sema::ActOnCompoundStmt(SourceLocation L, SourceLocation R,
                                 ArrayRef<Stmt *> Elts, bool isStmtExpr) {
const unsigned NumElts = Elts.size();

// If we're in C89 mode, check that we don't have any decls after stmts.  If
// so, emit an extension diagnostic.
if (!getLangOpts().C99 && !getLangOpts().CPlusPlus) {
  // Note that __extension__ can be around a decl.
  unsigned i = 0;
  // Skip over all declarations.
  for (; i != NumElts && isa<DeclStmt>(Elts[i]); ++i)
    /*empty*/;

  // We found the end of the list or a statement.  Scan for another declstmt.
  for (; i != NumElts && !isa<DeclStmt>(Elts[i]); ++i)
    /*empty*/;

  if (i != NumElts) {
    Decl *D = *cast<DeclStmt>(Elts[i])->decl_begin();
    Diag(D->getLocation(), diag::ext_mixed_decls_code);
  }
}
// Warn about unused expressions in statements.
for (unsigned i = 0; i != NumElts; ++i) {
  // Ignore statements that are last in a statement expression.
  if (isStmtExpr && i == NumElts - 1)
    continue;

  DiagnoseUnusedExprResult(Elts[i]);
}

// Check for suspicious empty body (null statement) in `for' and `while'
// statements.  Don't do anything for template instantiations, this just adds
// noise.
if (NumElts != 0 && !CurrentInstantiationScope &&
    getCurCompoundScope().HasEmptyLoopBodies) {
  for (unsigned i = 0; i != NumElts - 1; ++i)
    DiagnoseEmptyLoopBody(Elts[i], Elts[i + 1]);
}

return CompoundStmt::Create(Context, Elts, L, R);
393}

395StmtResult
396Sema::ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
                  SourceLocation DotDotDotLoc, Expr *RHSVal,
                  SourceLocation ColonLoc) {
assert(LHSVal && "missing expression in case statement")(static_cast <bool> (LHSVal && "missing expression in case statement"
) ? void (0) : __assert_fail ("LHSVal && \"missing expression in case statement\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 399, __extension__ __PRETTY_FUNCTION__));

if (getCurFunction()->SwitchStack.empty()) {
  Diag(CaseLoc, diag::err_case_not_in_switch);
  return StmtError();
}

ExprResult LHS =
    CorrectDelayedTyposInExpr(LHSVal, [this](class Expr *E) {
      if (!getLangOpts().CPlusPlus11)
        return VerifyIntegerConstantExpression(E);
      if (Expr *CondExpr =
              getCurFunction()->SwitchStack.back()->getCond()) {
        QualType CondType = CondExpr->getType();
        llvm::APSInt TempVal;
        return CheckConvertedConstantExpression(E, CondType, TempVal,
                                                      CCEK_CaseValue);
      }
      return ExprError();
    });
if (LHS.isInvalid())
  return StmtError();
LHSVal = LHS.get();

if (!getLangOpts().CPlusPlus11) {
  // C99 6.8.4.2p3: The expression shall be an integer constant.
  // However, GCC allows any evaluatable integer expression.
  if (!LHSVal->isTypeDependent() && !LHSVal->isValueDependent()) {
    LHSVal = VerifyIntegerConstantExpression(LHSVal).get();
    if (!LHSVal)
      return StmtError();
  }

  // GCC extension: The expression shall be an integer constant.

  if (RHSVal && !RHSVal->isTypeDependent() && !RHSVal->isValueDependent()) {
    RHSVal = VerifyIntegerConstantExpression(RHSVal).get();
    // Recover from an error by just forgetting about it.
  }
}

LHS = ActOnFinishFullExpr(LHSVal, LHSVal->getExprLoc(), false,
                               getLangOpts().CPlusPlus11);
if (LHS.isInvalid())
  return StmtError();

auto RHS = RHSVal ? ActOnFinishFullExpr(RHSVal, RHSVal->getExprLoc(), false,
                                        getLangOpts().CPlusPlus11)
                  : ExprResult();
if (RHS.isInvalid())
  return StmtError();

CaseStmt *CS = new (Context)
    CaseStmt(LHS.get(), RHS.get(), CaseLoc, DotDotDotLoc, ColonLoc);
getCurFunction()->SwitchStack.back()->addSwitchCase(CS);
return CS;
455}

457/// ActOnCaseStmtBody - This installs a statement as the body of a case.
458void Sema::ActOnCaseStmtBody(Stmt *caseStmt, Stmt *SubStmt) {
DiagnoseUnusedExprResult(SubStmt);

CaseStmt *CS = static_cast<CaseStmt*>(caseStmt);
CS->setSubStmt(SubStmt);
463}

465StmtResult
466Sema::ActOnDefaultStmt(SourceLocation DefaultLoc, SourceLocation ColonLoc,
                     Stmt *SubStmt, Scope *CurScope) {
DiagnoseUnusedExprResult(SubStmt);

if (getCurFunction()->SwitchStack.empty()) {
  Diag(DefaultLoc, diag::err_default_not_in_switch);
  return SubStmt;
}

DefaultStmt *DS = new (Context) DefaultStmt(DefaultLoc, ColonLoc, SubStmt);
getCurFunction()->SwitchStack.back()->addSwitchCase(DS);
return DS;
478}

480StmtResult
481Sema::ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
                   SourceLocation ColonLoc, Stmt *SubStmt) {
// If the label was multiply defined, reject it now.
if (TheDecl->getStmt()) {
  Diag(IdentLoc, diag::err_redefinition_of_label) << TheDecl->getDeclName();
  Diag(TheDecl->getLocation(), diag::note_previous_definition);
  return SubStmt;
}

// Otherwise, things are good.  Fill in the declaration and return it.
LabelStmt *LS = new (Context) LabelStmt(IdentLoc, TheDecl, SubStmt);
TheDecl->setStmt(LS);
if (!TheDecl->isGnuLocal()) {
  TheDecl->setLocStart(IdentLoc);
  if (!TheDecl->isMSAsmLabel()) {
    // Don't update the location of MS ASM labels.  These will result in
    // a diagnostic, and changing the location here will mess that up.
    TheDecl->setLocation(IdentLoc);
  }
}
return LS;
502}

504StmtResult Sema::ActOnAttributedStmt(SourceLocation AttrLoc,
                                   ArrayRef<const Attr*> Attrs,
                                   Stmt *SubStmt) {
// Fill in the declaration and return it.
AttributedStmt *LS = AttributedStmt::Create(Context, AttrLoc, Attrs, SubStmt);
return LS;
510}

512namespace {
513class CommaVisitor : public EvaluatedExprVisitor<CommaVisitor> {
typedef EvaluatedExprVisitor<CommaVisitor> Inherited;
Sema &SemaRef;
516public:
CommaVisitor(Sema &SemaRef) : Inherited(SemaRef.Context), SemaRef(SemaRef) {}
void VisitBinaryOperator(BinaryOperator *E) {
  if (E->getOpcode() == BO_Comma)
    SemaRef.DiagnoseCommaOperator(E->getLHS(), E->getExprLoc());
  EvaluatedExprVisitor<CommaVisitor>::VisitBinaryOperator(E);
}
523};
524}

526StmtResult
527Sema::ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr, Stmt *InitStmt,
                ConditionResult Cond,
                Stmt *thenStmt, SourceLocation ElseLoc,
                Stmt *elseStmt) {
if (Cond.isInvalid())
  Cond = ConditionResult(
      *this, nullptr,
      MakeFullExpr(new (Context) OpaqueValueExpr(SourceLocation(),
                                                 Context.BoolTy, VK_RValue),
                   IfLoc),
      false);

Expr *CondExpr = Cond.get().second;
if (!Diags.isIgnored(diag::warn_comma_operator,
                     CondExpr->getExprLoc()))
  CommaVisitor(*this).Visit(CondExpr);

if (!elseStmt)
  DiagnoseEmptyStmtBody(CondExpr->getLocEnd(), thenStmt,
                        diag::warn_empty_if_body);

return BuildIfStmt(IfLoc, IsConstexpr, InitStmt, Cond, thenStmt, ElseLoc,
                   elseStmt);
550}

552StmtResult Sema::BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                           Stmt *InitStmt, ConditionResult Cond,
                           Stmt *thenStmt, SourceLocation ElseLoc,
                           Stmt *elseStmt) {
if (Cond.isInvalid())
  return StmtError();

if (IsConstexpr || isa<ObjCAvailabilityCheckExpr>(Cond.get().second))
  getCurFunction()->setHasBranchProtectedScope();

DiagnoseUnusedExprResult(thenStmt);
DiagnoseUnusedExprResult(elseStmt);

return new (Context)
    IfStmt(Context, IfLoc, IsConstexpr, InitStmt, Cond.get().first,
           Cond.get().second, thenStmt, ElseLoc, elseStmt);
568}

570namespace {
struct CaseCompareFunctor {
  bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS,
                  const llvm::APSInt &RHS) {
    return LHS.first < RHS;
  }
  bool operator()(const std::pair<llvm::APSInt, CaseStmt*> &LHS,
                  const std::pair<llvm::APSInt, CaseStmt*> &RHS) {
    return LHS.first < RHS.first;
  }
  bool operator()(const llvm::APSInt &LHS,
                  const std::pair<llvm::APSInt, CaseStmt*> &RHS) {
    return LHS < RHS.first;
  }
};
585}

587/// CmpCaseVals - Comparison predicate for sorting case values.
588///
589static bool CmpCaseVals(const std::pair<llvm::APSInt, CaseStmt*>& lhs,
                      const std::pair<llvm::APSInt, CaseStmt*>& rhs) {
if (lhs.first < rhs.first)
  return true;

if (lhs.first == rhs.first &&
    lhs.second->getCaseLoc().getRawEncoding()
     < rhs.second->getCaseLoc().getRawEncoding())
  return true;
return false;
599}

601/// CmpEnumVals - Comparison predicate for sorting enumeration values.
602///
603static bool CmpEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs,
                      const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs)
605{
return lhs.first < rhs.first;
607}

609/// EqEnumVals - Comparison preficate for uniqing enumeration values.
610///
611static bool EqEnumVals(const std::pair<llvm::APSInt, EnumConstantDecl*>& lhs,
                     const std::pair<llvm::APSInt, EnumConstantDecl*>& rhs)
613{
return lhs.first == rhs.first;
615}

617/// GetTypeBeforeIntegralPromotion - Returns the pre-promotion type of
618/// potentially integral-promoted expression @p expr.
619static QualType GetTypeBeforeIntegralPromotion(const Expr *&E) {
if (const auto *CleanUps = dyn_cast<ExprWithCleanups>(E))
  E = CleanUps->getSubExpr();
while (const auto *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
  if (ImpCast->getCastKind() != CK_IntegralCast) break;
  E = ImpCast->getSubExpr();
}
return E->getType();
627}

629ExprResult Sema::CheckSwitchCondition(SourceLocation SwitchLoc, Expr *Cond) {
class SwitchConvertDiagnoser : public ICEConvertDiagnoser {
  Expr *Cond;

public:
  SwitchConvertDiagnoser(Expr *Cond)
      : ICEConvertDiagnoser(/*AllowScopedEnumerations*/true, false, true),
        Cond(Cond) {}

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

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

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

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

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

  SemaDiagnosticBuilder noteAmbiguous(
      Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
    return S.Diag(Conv->getLocation(), diag::note_switch_conversion)
    << 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~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 673);
  }
} SwitchDiagnoser(Cond);

ExprResult CondResult =
    PerformContextualImplicitConversion(SwitchLoc, Cond, SwitchDiagnoser);
if (CondResult.isInvalid())
  return ExprError();

// C99 6.8.4.2p5 - Integer promotions are performed on the controlling expr.
return UsualUnaryConversions(CondResult.get());
684}

686StmtResult Sema::ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
                                      Stmt *InitStmt, ConditionResult Cond) {
if (Cond.isInvalid())
  return StmtError();

getCurFunction()->setHasBranchIntoScope();

SwitchStmt *SS = new (Context)
    SwitchStmt(Context, InitStmt, Cond.get().first, Cond.get().second);
getCurFunction()->SwitchStack.push_back(SS);
return SS;
697}

699static void AdjustAPSInt(llvm::APSInt &Val, unsigned BitWidth, bool IsSigned) {
Val = Val.extOrTrunc(BitWidth);
Val.setIsSigned(IsSigned);
702}

704/// Check the specified case value is in range for the given unpromoted switch
705/// type.
706static void checkCaseValue(Sema &S, SourceLocation Loc, const llvm::APSInt &Val,
                         unsigned UnpromotedWidth, bool UnpromotedSign) {
// If the case value was signed and negative and the switch expression is
// unsigned, don't bother to warn: this is implementation-defined behavior.
// FIXME: Introduce a second, default-ignored warning for this case?
if (UnpromotedWidth < Val.getBitWidth()) {
  llvm::APSInt ConvVal(Val);
  AdjustAPSInt(ConvVal, UnpromotedWidth, UnpromotedSign);
  AdjustAPSInt(ConvVal, Val.getBitWidth(), Val.isSigned());
  // FIXME: Use different diagnostics for overflow  in conversion to promoted
  // type versus "switch expression cannot have this value". Use proper
  // IntRange checking rather than just looking at the unpromoted type here.
  if (ConvVal != Val)
    S.Diag(Loc, diag::warn_case_value_overflow) << Val.toString(10)
                                                << ConvVal.toString(10);
}
722}

724typedef SmallVector<std::pair<llvm::APSInt, EnumConstantDecl*>, 64> EnumValsTy;

726/// Returns true if we should emit a diagnostic about this case expression not
727/// being a part of the enum used in the switch controlling expression.
728static bool ShouldDiagnoseSwitchCaseNotInEnum(const Sema &S,
                                            const EnumDecl *ED,
                                            const Expr *CaseExpr,
                                            EnumValsTy::iterator &EI,
                                            EnumValsTy::iterator &EIEnd,
                                            const llvm::APSInt &Val) {
if (!ED->isClosed())
  return false;

if (const DeclRefExpr *DRE =
        dyn_cast<DeclRefExpr>(CaseExpr->IgnoreParenImpCasts())) {
  if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) {
    QualType VarType = VD->getType();
    QualType EnumType = S.Context.getTypeDeclType(ED);
    if (VD->hasGlobalStorage() && VarType.isConstQualified() &&
        S.Context.hasSameUnqualifiedType(EnumType, VarType))
      return false;
  }
}

if (ED->hasAttr<FlagEnumAttr>())
  return !S.IsValueInFlagEnum(ED, Val, false);

while (EI != EIEnd && EI->first < Val)
  EI++;

if (EI != EIEnd && EI->first == Val)
  return false;

return true;
758}

760static void checkEnumTypesInSwitchStmt(Sema &S, const Expr *Cond,
                                     const Expr *Case) {
QualType CondType = GetTypeBeforeIntegralPromotion(Cond);
QualType CaseType = Case->getType();

const EnumType *CondEnumType = CondType->getAs<EnumType>();
const EnumType *CaseEnumType = CaseType->getAs<EnumType>();
if (!CondEnumType || !CaseEnumType)
  return;

// Ignore anonymous enums.
if (!CondEnumType->getDecl()->getIdentifier() &&
    !CondEnumType->getDecl()->getTypedefNameForAnonDecl())
  return;
if (!CaseEnumType->getDecl()->getIdentifier() &&
    !CaseEnumType->getDecl()->getTypedefNameForAnonDecl())
  return;

if (S.Context.hasSameUnqualifiedType(CondType, CaseType))
  return;

S.Diag(Case->getExprLoc(), diag::warn_comparison_of_mixed_enum_types_switch)
    << CondType << CaseType << Cond->getSourceRange()
    << Case->getSourceRange();
784}

786StmtResult
787Sema::ActOnFinishSwitchStmt(SourceLocation SwitchLoc, Stmt *Switch,
                          Stmt *BodyStmt) {
SwitchStmt *SS = cast<SwitchStmt>(Switch);
assert(SS == getCurFunction()->SwitchStack.back() &&(static_cast <bool> (SS == getCurFunction()->SwitchStack
.back() && "switch stack missing push/pop!") ? void (
0) : __assert_fail ("SS == getCurFunction()->SwitchStack.back() && \"switch stack missing push/pop!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 791, __extension__ __PRETTY_FUNCTION__))
       "switch stack missing push/pop!")(static_cast <bool> (SS == getCurFunction()->SwitchStack
.back() && "switch stack missing push/pop!") ? void (
0) : __assert_fail ("SS == getCurFunction()->SwitchStack.back() && \"switch stack missing push/pop!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 791, __extension__ __PRETTY_FUNCTION__));

getCurFunction()->SwitchStack.pop_back();

if (!BodyStmt) return StmtError();
SS->setBody(BodyStmt, SwitchLoc);

Expr *CondExpr = SS->getCond();
if (!CondExpr) return StmtError();

QualType CondType = CondExpr->getType();

const Expr *CondExprBeforePromotion = CondExpr;
QualType CondTypeBeforePromotion =
    GetTypeBeforeIntegralPromotion(CondExprBeforePromotion);

// C++ 6.4.2.p2:
// Integral promotions are performed (on the switch condition).
//
// A case value unrepresentable by the original switch condition
// type (before the promotion) doesn't make sense, even when it can
// be represented by the promoted type.  Therefore we need to find
// the pre-promotion type of the switch condition.
if (!CondExpr->isTypeDependent()) {
  // We have already converted the expression to an integral or enumeration
  // type, when we started the switch statement. If we don't have an
  // appropriate type now, just return an error.
  if (!CondType->isIntegralOrEnumerationType())
    return StmtError();

  if (CondExpr->isKnownToHaveBooleanValue()) {
    // switch(bool_expr) {...} is often a programmer error, e.g.
    //   switch(n && mask) { ... }  // Doh - should be "n & mask".
    // One can always use an if statement instead of switch(bool_expr).
    Diag(SwitchLoc, diag::warn_bool_switch_condition)
        << CondExpr->getSourceRange();
  }
}

// Get the bitwidth of the switched-on value after promotions. We must
// convert the integer case values to this width before comparison.
bool HasDependentValue
  = CondExpr->isTypeDependent() || CondExpr->isValueDependent();
unsigned CondWidth = HasDependentValue ? 0 : Context.getIntWidth(CondType);
bool CondIsSigned = CondType->isSignedIntegerOrEnumerationType();

// Get the width and signedness that the condition might actually have, for
// warning purposes.
// FIXME: Grab an IntRange for the condition rather than using the unpromoted
// type.
unsigned CondWidthBeforePromotion
  = HasDependentValue ? 0 : Context.getIntWidth(CondTypeBeforePromotion);
bool CondIsSignedBeforePromotion
  = CondTypeBeforePromotion->isSignedIntegerOrEnumerationType();

// Accumulate all of the case values in a vector so that we can sort them
// and detect duplicates.  This vector contains the APInt for the case after
// it has been converted to the condition type.
typedef SmallVector<std::pair<llvm::APSInt, CaseStmt*>, 64> CaseValsTy;
CaseValsTy CaseVals;

// Keep track of any GNU case ranges we see.  The APSInt is the low value.
typedef std::vector<std::pair<llvm::APSInt, CaseStmt*> > CaseRangesTy;
CaseRangesTy CaseRanges;

DefaultStmt *TheDefaultStmt = nullptr;

bool CaseListIsErroneous = false;

for (SwitchCase *SC = SS->getSwitchCaseList(); SC && !HasDependentValue;
     SC = SC->getNextSwitchCase()) {

  if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC)) {
    if (TheDefaultStmt) {
      Diag(DS->getDefaultLoc(), diag::err_multiple_default_labels_defined);
      Diag(TheDefaultStmt->getDefaultLoc(), diag::note_duplicate_case_prev);

      // FIXME: Remove the default statement from the switch block so that
      // we'll return a valid AST.  This requires recursing down the AST and
      // finding it, not something we are set up to do right now.  For now,
      // just lop the entire switch stmt out of the AST.
      CaseListIsErroneous = true;
    }
    TheDefaultStmt = DS;

  } else {
    CaseStmt *CS = cast<CaseStmt>(SC);

    Expr *Lo = CS->getLHS();

    if (Lo->isTypeDependent() || Lo->isValueDependent()) {
      HasDependentValue = true;
      break;
    }

    checkEnumTypesInSwitchStmt(*this, CondExpr, Lo);

    llvm::APSInt LoVal;

    if (getLangOpts().CPlusPlus11) {
      // C++11 [stmt.switch]p2: the constant-expression shall be a converted
      // constant expression of the promoted type of the switch condition.
      ExprResult ConvLo =
        CheckConvertedConstantExpression(Lo, CondType, LoVal, CCEK_CaseValue);
      if (ConvLo.isInvalid()) {
        CaseListIsErroneous = true;
        continue;
      }
      Lo = ConvLo.get();
    } else {
      // We already verified that the expression has a i-c-e value (C99
      // 6.8.4.2p3) - get that value now.
      LoVal = Lo->EvaluateKnownConstInt(Context);

      // If the LHS is not the same type as the condition, insert an implicit
      // cast.
      Lo = DefaultLvalueConversion(Lo).get();
      Lo = ImpCastExprToType(Lo, CondType, CK_IntegralCast).get();
    }

    // Check the unconverted value is within the range of possible values of
    // the switch expression.
    checkCaseValue(*this, Lo->getLocStart(), LoVal,
                   CondWidthBeforePromotion, CondIsSignedBeforePromotion);

    // Convert the value to the same width/sign as the condition.
    AdjustAPSInt(LoVal, CondWidth, CondIsSigned);

    CS->setLHS(Lo);

    // If this is a case range, remember it in CaseRanges, otherwise CaseVals.
    if (CS->getRHS()) {
      if (CS->getRHS()->isTypeDependent() ||
          CS->getRHS()->isValueDependent()) {
        HasDependentValue = true;
        break;
      }
      CaseRanges.push_back(std::make_pair(LoVal, CS));
    } else
      CaseVals.push_back(std::make_pair(LoVal, CS));
  }
}

if (!HasDependentValue) {
  // If we don't have a default statement, check whether the
  // condition is constant.
  llvm::APSInt ConstantCondValue;
  bool HasConstantCond = false;
  if (!HasDependentValue && !TheDefaultStmt) {
    HasConstantCond = CondExpr->EvaluateAsInt(ConstantCondValue, Context,
                                              Expr::SE_AllowSideEffects);
    assert(!HasConstantCond ||(static_cast <bool> (!HasConstantCond || (ConstantCondValue
.getBitWidth() == CondWidth && ConstantCondValue.isSigned
() == CondIsSigned)) ? void (0) : __assert_fail ("!HasConstantCond || (ConstantCondValue.getBitWidth() == CondWidth && ConstantCondValue.isSigned() == CondIsSigned)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 944, __extension__ __PRETTY_FUNCTION__))
           (ConstantCondValue.getBitWidth() == CondWidth &&(static_cast <bool> (!HasConstantCond || (ConstantCondValue
.getBitWidth() == CondWidth && ConstantCondValue.isSigned
() == CondIsSigned)) ? void (0) : __assert_fail ("!HasConstantCond || (ConstantCondValue.getBitWidth() == CondWidth && ConstantCondValue.isSigned() == CondIsSigned)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 944, __extension__ __PRETTY_FUNCTION__))
            ConstantCondValue.isSigned() == CondIsSigned))(static_cast <bool> (!HasConstantCond || (ConstantCondValue
.getBitWidth() == CondWidth && ConstantCondValue.isSigned
() == CondIsSigned)) ? void (0) : __assert_fail ("!HasConstantCond || (ConstantCondValue.getBitWidth() == CondWidth && ConstantCondValue.isSigned() == CondIsSigned)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 944, __extension__ __PRETTY_FUNCTION__));
  }
  bool ShouldCheckConstantCond = HasConstantCond;

  // Sort all the scalar case values so we can easily detect duplicates.
  std::stable_sort(CaseVals.begin(), CaseVals.end(), CmpCaseVals);

  if (!CaseVals.empty()) {
    for (unsigned i = 0, e = CaseVals.size(); i != e; ++i) {
      if (ShouldCheckConstantCond &&
          CaseVals[i].first == ConstantCondValue)
        ShouldCheckConstantCond = false;

      if (i != 0 && CaseVals[i].first == CaseVals[i-1].first) {
        // If we have a duplicate, report it.
        // First, determine if either case value has a name
        StringRef PrevString, CurrString;
        Expr *PrevCase = CaseVals[i-1].second->getLHS()->IgnoreParenCasts();
        Expr *CurrCase = CaseVals[i].second->getLHS()->IgnoreParenCasts();
        if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(PrevCase)) {
          PrevString = DeclRef->getDecl()->getName();
        }
        if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(CurrCase)) {
          CurrString = DeclRef->getDecl()->getName();
        }
        SmallString<16> CaseValStr;
        CaseVals[i-1].first.toString(CaseValStr);

        if (PrevString == CurrString)
          Diag(CaseVals[i].second->getLHS()->getLocStart(),
               diag::err_duplicate_case) <<
               (PrevString.empty() ? StringRef(CaseValStr) : PrevString);
        else
          Diag(CaseVals[i].second->getLHS()->getLocStart(),
               diag::err_duplicate_case_differing_expr) <<
               (PrevString.empty() ? StringRef(CaseValStr) : PrevString) <<
               (CurrString.empty() ? StringRef(CaseValStr) : CurrString) <<
               CaseValStr;

        Diag(CaseVals[i-1].second->getLHS()->getLocStart(),
             diag::note_duplicate_case_prev);
        // FIXME: We really want to remove the bogus case stmt from the
        // substmt, but we have no way to do this right now.
        CaseListIsErroneous = true;
      }
    }
  }

  // Detect duplicate case ranges, which usually don't exist at all in
  // the first place.
  if (!CaseRanges.empty()) {
    // Sort all the case ranges by their low value so we can easily detect
    // overlaps between ranges.
    std::stable_sort(CaseRanges.begin(), CaseRanges.end());

    // Scan the ranges, computing the high values and removing empty ranges.
    std::vector<llvm::APSInt> HiVals;
    for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) {
      llvm::APSInt &LoVal = CaseRanges[i].first;
      CaseStmt *CR = CaseRanges[i].second;
      Expr *Hi = CR->getRHS();
      llvm::APSInt HiVal;

      if (getLangOpts().CPlusPlus11) {
        // C++11 [stmt.switch]p2: the constant-expression shall be a converted
        // constant expression of the promoted type of the switch condition.
        ExprResult ConvHi =
          CheckConvertedConstantExpression(Hi, CondType, HiVal,
                                           CCEK_CaseValue);
        if (ConvHi.isInvalid()) {
          CaseListIsErroneous = true;
          continue;
        }
        Hi = ConvHi.get();
      } else {
        HiVal = Hi->EvaluateKnownConstInt(Context);

        // If the RHS is not the same type as the condition, insert an
        // implicit cast.
        Hi = DefaultLvalueConversion(Hi).get();
        Hi = ImpCastExprToType(Hi, CondType, CK_IntegralCast).get();
      }

      // Check the unconverted value is within the range of possible values of
      // the switch expression.
      checkCaseValue(*this, Hi->getLocStart(), HiVal,
                     CondWidthBeforePromotion, CondIsSignedBeforePromotion);

      // Convert the value to the same width/sign as the condition.
      AdjustAPSInt(HiVal, CondWidth, CondIsSigned);

      CR->setRHS(Hi);

      // If the low value is bigger than the high value, the case is empty.
      if (LoVal > HiVal) {
        Diag(CR->getLHS()->getLocStart(), diag::warn_case_empty_range)
          << SourceRange(CR->getLHS()->getLocStart(),
                         Hi->getLocEnd());
        CaseRanges.erase(CaseRanges.begin()+i);
        --i;
        --e;
        continue;
      }

      if (ShouldCheckConstantCond &&
          LoVal <= ConstantCondValue &&
          ConstantCondValue <= HiVal)
        ShouldCheckConstantCond = false;

      HiVals.push_back(HiVal);
    }

    // Rescan the ranges, looking for overlap with singleton values and other
    // ranges.  Since the range list is sorted, we only need to compare case
    // ranges with their neighbors.
    for (unsigned i = 0, e = CaseRanges.size(); i != e; ++i) {
      llvm::APSInt &CRLo = CaseRanges[i].first;
      llvm::APSInt &CRHi = HiVals[i];
      CaseStmt *CR = CaseRanges[i].second;

      // Check to see whether the case range overlaps with any
      // singleton cases.
      CaseStmt *OverlapStmt = nullptr;
      llvm::APSInt OverlapVal(32);

      // Find the smallest value >= the lower bound.  If I is in the
      // case range, then we have overlap.
      CaseValsTy::iterator I = std::lower_bound(CaseVals.begin(),
                                                CaseVals.end(), CRLo,
                                                CaseCompareFunctor());
      if (I != CaseVals.end() && I->first < CRHi) {
        OverlapVal  = I->first;   // Found overlap with scalar.
        OverlapStmt = I->second;
      }

      // Find the smallest value bigger than the upper bound.
      I = std::upper_bound(I, CaseVals.end(), CRHi, CaseCompareFunctor());
      if (I != CaseVals.begin() && (I-1)->first >= CRLo) {
        OverlapVal  = (I-1)->first;      // Found overlap with scalar.
        OverlapStmt = (I-1)->second;
      }

      // Check to see if this case stmt overlaps with the subsequent
      // case range.
      if (i && CRLo <= HiVals[i-1]) {
        OverlapVal  = HiVals[i-1];       // Found overlap with range.
        OverlapStmt = CaseRanges[i-1].second;
      }

      if (OverlapStmt) {
        // If we have a duplicate, report it.
        Diag(CR->getLHS()->getLocStart(), diag::err_duplicate_case)
          << OverlapVal.toString(10);
        Diag(OverlapStmt->getLHS()->getLocStart(),
             diag::note_duplicate_case_prev);
        // FIXME: We really want to remove the bogus case stmt from the
        // substmt, but we have no way to do this right now.
        CaseListIsErroneous = true;
      }
    }
  }

  // Complain if we have a constant condition and we didn't find a match.
  if (!CaseListIsErroneous && ShouldCheckConstantCond) {
    // TODO: it would be nice if we printed enums as enums, chars as
    // chars, etc.
    Diag(CondExpr->getExprLoc(), diag::warn_missing_case_for_condition)
      << ConstantCondValue.toString(10)
      << CondExpr->getSourceRange();
  }

  // Check to see if switch is over an Enum and handles all of its
  // values.  We only issue a warning if there is not 'default:', but
  // we still do the analysis to preserve this information in the AST
  // (which can be used by flow-based analyes).
  //
  const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>();

  // If switch has default case, then ignore it.
  if (!CaseListIsErroneous && !HasConstantCond && ET &&
      ET->getDecl()->isCompleteDefinition()) {
    const EnumDecl *ED = ET->getDecl();
    EnumValsTy EnumVals;

    // Gather all enum values, set their type and sort them,
    // allowing easier comparison with CaseVals.
    for (auto *EDI : ED->enumerators()) {
      llvm::APSInt Val = EDI->getInitVal();
      AdjustAPSInt(Val, CondWidth, CondIsSigned);
      EnumVals.push_back(std::make_pair(Val, EDI));
    }
    std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals);
    auto EI = EnumVals.begin(), EIEnd =
      std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals);

    // See which case values aren't in enum.
    for (CaseValsTy::const_iterator CI = CaseVals.begin();
        CI != CaseVals.end(); CI++) {
      Expr *CaseExpr = CI->second->getLHS();
      if (ShouldDiagnoseSwitchCaseNotInEnum(*this, ED, CaseExpr, EI, EIEnd,
                                            CI->first))
        Diag(CaseExpr->getExprLoc(), diag::warn_not_in_enum)
          << CondTypeBeforePromotion;
    }

    // See which of case ranges aren't in enum
    EI = EnumVals.begin();
    for (CaseRangesTy::const_iterator RI = CaseRanges.begin();
        RI != CaseRanges.end(); RI++) {
      Expr *CaseExpr = RI->second->getLHS();
      if (ShouldDiagnoseSwitchCaseNotInEnum(*this, ED, CaseExpr, EI, EIEnd,
                                            RI->first))
        Diag(CaseExpr->getExprLoc(), diag::warn_not_in_enum)
          << CondTypeBeforePromotion;

      llvm::APSInt Hi =
        RI->second->getRHS()->EvaluateKnownConstInt(Context);
      AdjustAPSInt(Hi, CondWidth, CondIsSigned);

      CaseExpr = RI->second->getRHS();
      if (ShouldDiagnoseSwitchCaseNotInEnum(*this, ED, CaseExpr, EI, EIEnd,
                                            Hi))
        Diag(CaseExpr->getExprLoc(), diag::warn_not_in_enum)
          << CondTypeBeforePromotion;
    }

    // Check which enum vals aren't in switch
    auto CI = CaseVals.begin();
    auto RI = CaseRanges.begin();
    bool hasCasesNotInSwitch = false;

    SmallVector<DeclarationName,8> UnhandledNames;

    for (EI = EnumVals.begin(); EI != EIEnd; EI++){
      // Drop unneeded case values
      while (CI != CaseVals.end() && CI->first < EI->first)
        CI++;

      if (CI != CaseVals.end() && CI->first == EI->first)
        continue;

      // Drop unneeded case ranges
      for (; RI != CaseRanges.end(); RI++) {
        llvm::APSInt Hi =
          RI->second->getRHS()->EvaluateKnownConstInt(Context);
        AdjustAPSInt(Hi, CondWidth, CondIsSigned);
        if (EI->first <= Hi)
          break;
      }

      if (RI == CaseRanges.end() || EI->first < RI->first) {
        hasCasesNotInSwitch = true;
        UnhandledNames.push_back(EI->second->getDeclName());
      }
    }

    if (TheDefaultStmt && UnhandledNames.empty() && ED->isClosedNonFlag())
      Diag(TheDefaultStmt->getDefaultLoc(), diag::warn_unreachable_default);

    // Produce a nice diagnostic if multiple values aren't handled.
    if (!UnhandledNames.empty()) {
      DiagnosticBuilder DB = Diag(CondExpr->getExprLoc(),
                                  TheDefaultStmt ? diag::warn_def_missing_case
                                                 : diag::warn_missing_case)
                             << (int)UnhandledNames.size();

      for (size_t I = 0, E = std::min(UnhandledNames.size(), (size_t)3);
           I != E; ++I)
        DB << UnhandledNames[I];
    }

    if (!hasCasesNotInSwitch)
      SS->setAllEnumCasesCovered();
  }
}

if (BodyStmt)
  DiagnoseEmptyStmtBody(CondExpr->getLocEnd(), BodyStmt,
                        diag::warn_empty_switch_body);

// FIXME: If the case list was broken is some way, we don't have a good system
// to patch it up.  Instead, just return the whole substmt as broken.
if (CaseListIsErroneous)
  return StmtError();

return SS;
1230}

1232void
1233Sema::DiagnoseAssignmentEnum(QualType DstType, QualType SrcType,
                           Expr *SrcExpr) {
if (Diags.isIgnored(diag::warn_not_in_enum_assignment, SrcExpr->getExprLoc()))
  return;

if (const EnumType *ET = DstType->getAs<EnumType>())
  if (!Context.hasSameUnqualifiedType(SrcType, DstType) &&
      SrcType->isIntegerType()) {
    if (!SrcExpr->isTypeDependent() && !SrcExpr->isValueDependent() &&
        SrcExpr->isIntegerConstantExpr(Context)) {
      // Get the bitwidth of the enum value before promotions.
      unsigned DstWidth = Context.getIntWidth(DstType);
      bool DstIsSigned = DstType->isSignedIntegerOrEnumerationType();

      llvm::APSInt RhsVal = SrcExpr->EvaluateKnownConstInt(Context);
      AdjustAPSInt(RhsVal, DstWidth, DstIsSigned);
      const EnumDecl *ED = ET->getDecl();

      if (!ED->isClosed())
        return;

      if (ED->hasAttr<FlagEnumAttr>()) {
        if (!IsValueInFlagEnum(ED, RhsVal, true))
          Diag(SrcExpr->getExprLoc(), diag::warn_not_in_enum_assignment)
            << DstType.getUnqualifiedType();
      } else {
        typedef SmallVector<std::pair<llvm::APSInt, EnumConstantDecl *>, 64>
            EnumValsTy;
        EnumValsTy EnumVals;

        // Gather all enum values, set their type and sort them,
        // allowing easier comparison with rhs constant.
        for (auto *EDI : ED->enumerators()) {
          llvm::APSInt Val = EDI->getInitVal();
          AdjustAPSInt(Val, DstWidth, DstIsSigned);
          EnumVals.push_back(std::make_pair(Val, EDI));
        }
        if (EnumVals.empty())
          return;
        std::stable_sort(EnumVals.begin(), EnumVals.end(), CmpEnumVals);
        EnumValsTy::iterator EIend =
            std::unique(EnumVals.begin(), EnumVals.end(), EqEnumVals);

        // See which values aren't in the enum.
        EnumValsTy::const_iterator EI = EnumVals.begin();
        while (EI != EIend && EI->first < RhsVal)
          EI++;
        if (EI == EIend || EI->first != RhsVal) {
          Diag(SrcExpr->getExprLoc(), diag::warn_not_in_enum_assignment)
              << DstType.getUnqualifiedType();
        }
      }
    }
  }
1287}

1289StmtResult Sema::ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
                              Stmt *Body) {
if (Cond.isInvalid())
  return StmtError();

auto CondVal = Cond.get();
CheckBreakContinueBinding(CondVal.second);

if (CondVal.second &&
    !Diags.isIgnored(diag::warn_comma_operator, CondVal.second->getExprLoc()))
  CommaVisitor(*this).Visit(CondVal.second);

DiagnoseUnusedExprResult(Body);

if (isa<NullStmt>(Body))
  getCurCompoundScope().setHasEmptyLoopBodies();

return new (Context)
    WhileStmt(Context, CondVal.first, CondVal.second, Body, WhileLoc);
1308}

1310StmtResult
1311Sema::ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
                SourceLocation WhileLoc, SourceLocation CondLParen,
                Expr *Cond, SourceLocation CondRParen) {
assert(Cond && "ActOnDoStmt(): missing expression")(static_cast <bool> (Cond && "ActOnDoStmt(): missing expression"
) ? void (0) : __assert_fail ("Cond && \"ActOnDoStmt(): missing expression\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 1314, __extension__ __PRETTY_FUNCTION__));

CheckBreakContinueBinding(Cond);
ExprResult CondResult = CheckBooleanCondition(DoLoc, Cond);
if (CondResult.isInvalid())
  return StmtError();
Cond = CondResult.get();

CondResult = ActOnFinishFullExpr(Cond, DoLoc);
if (CondResult.isInvalid())
  return StmtError();
Cond = CondResult.get();

DiagnoseUnusedExprResult(Body);

return new (Context) DoStmt(Body, Cond, DoLoc, WhileLoc, CondRParen);
1330}

1332namespace {
// Use SetVector since the diagnostic cares about the ordering of the Decl's.
using DeclSetVector =
    llvm::SetVector<VarDecl *, llvm::SmallVector<VarDecl *, 8>,
                    llvm::SmallPtrSet<VarDecl *, 8>>;

// This visitor will traverse a conditional statement and store all
// the evaluated decls into a vector.  Simple is set to true if none
// of the excluded constructs are used.
class DeclExtractor : public EvaluatedExprVisitor<DeclExtractor> {
  DeclSetVector &Decls;
  SmallVectorImpl<SourceRange> &Ranges;
  bool Simple;
public:
  typedef EvaluatedExprVisitor<DeclExtractor> Inherited;

  DeclExtractor(Sema &S, DeclSetVector &Decls,
                SmallVectorImpl<SourceRange> &Ranges) :
      Inherited(S.Context),
      Decls(Decls),
      Ranges(Ranges),
      Simple(true) {}

  bool isSimple() { return Simple; }

  // Replaces the method in EvaluatedExprVisitor.
  void VisitMemberExpr(MemberExpr* E) {
    Simple = false;
  }

  // Any Stmt not whitelisted will cause the condition to be marked complex.
  void VisitStmt(Stmt *S) {
    Simple = false;
  }

  void VisitBinaryOperator(BinaryOperator *E) {
    Visit(E->getLHS());
    Visit(E->getRHS());
  }

  void VisitCastExpr(CastExpr *E) {
    Visit(E->getSubExpr());
  }

  void VisitUnaryOperator(UnaryOperator *E) {
    // Skip checking conditionals with derefernces.
    if (E->getOpcode() == UO_Deref)
      Simple = false;
    else
      Visit(E->getSubExpr());
  }

  void VisitConditionalOperator(ConditionalOperator *E) {
    Visit(E->getCond());
    Visit(E->getTrueExpr());
    Visit(E->getFalseExpr());
  }

  void VisitParenExpr(ParenExpr *E) {
    Visit(E->getSubExpr());
  }

  void VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
    Visit(E->getOpaqueValue()->getSourceExpr());
    Visit(E->getFalseExpr());
  }

  void VisitIntegerLiteral(IntegerLiteral *E) { }
  void VisitFloatingLiteral(FloatingLiteral *E) { }
  void VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) { }
  void VisitCharacterLiteral(CharacterLiteral *E) { }
  void VisitGNUNullExpr(GNUNullExpr *E) { }
  void VisitImaginaryLiteral(ImaginaryLiteral *E) { }

  void VisitDeclRefExpr(DeclRefExpr *E) {
    VarDecl *VD = dyn_cast<VarDecl>(E->getDecl());
    if (!VD) return;

    Ranges.push_back(E->getSourceRange());

    Decls.insert(VD);
  }

}; // end class DeclExtractor

// DeclMatcher checks to see if the decls are used in a non-evaluated
// context.
class DeclMatcher : public EvaluatedExprVisitor<DeclMatcher> {
  DeclSetVector &Decls;
  bool FoundDecl;

public:
  typedef EvaluatedExprVisitor<DeclMatcher> Inherited;

  DeclMatcher(Sema &S, DeclSetVector &Decls, Stmt *Statement) :
      Inherited(S.Context), Decls(Decls), FoundDecl(false) {
    if (!Statement) return;

    Visit(Statement);
  }

  void VisitReturnStmt(ReturnStmt *S) {
    FoundDecl = true;
  }

  void VisitBreakStmt(BreakStmt *S) {
    FoundDecl = true;
  }

  void VisitGotoStmt(GotoStmt *S) {
    FoundDecl = true;
  }

  void VisitCastExpr(CastExpr *E) {
    if (E->getCastKind() == CK_LValueToRValue)
      CheckLValueToRValueCast(E->getSubExpr());
    else
      Visit(E->getSubExpr());
  }

  void CheckLValueToRValueCast(Expr *E) {
    E = E->IgnoreParenImpCasts();

    if (isa<DeclRefExpr>(E)) {
      return;
    }

    if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
      Visit(CO->getCond());
      CheckLValueToRValueCast(CO->getTrueExpr());
      CheckLValueToRValueCast(CO->getFalseExpr());
      return;
    }

    if (BinaryConditionalOperator *BCO =
            dyn_cast<BinaryConditionalOperator>(E)) {
      CheckLValueToRValueCast(BCO->getOpaqueValue()->getSourceExpr());
      CheckLValueToRValueCast(BCO->getFalseExpr());
      return;
    }

    Visit(E);
  }

  void VisitDeclRefExpr(DeclRefExpr *E) {
    if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
      if (Decls.count(VD))
        FoundDecl = true;
  }

  void VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
    // Only need to visit the semantics for POE.
    // SyntaticForm doesn't really use the Decal.
    for (auto *S : POE->semantics()) {
      if (auto *OVE = dyn_cast<OpaqueValueExpr>(S))
        // Look past the OVE into the expression it binds.
        Visit(OVE->getSourceExpr());
      else
        Visit(S);
    }
  }

  bool FoundDeclInUse() { return FoundDecl; }

};  // end class DeclMatcher

void CheckForLoopConditionalStatement(Sema &S, Expr *Second,
                                      Expr *Third, Stmt *Body) {
  // Condition is empty
  if (!Second) return;

  if (S.Diags.isIgnored(diag::warn_variables_not_in_loop_body,
                        Second->getLocStart()))
    return;

  PartialDiagnostic PDiag = S.PDiag(diag::warn_variables_not_in_loop_body);
  DeclSetVector Decls;
  SmallVector<SourceRange, 10> Ranges;
  DeclExtractor DE(S, Decls, Ranges);
  DE.Visit(Second);

  // Don't analyze complex conditionals.
  if (!DE.isSimple()) return;

  // No decls found.
  if (Decls.size() == 0) return;

  // Don't warn on volatile, static, or global variables.
  for (auto *VD : Decls)
    if (VD->getType().isVolatileQualified() || VD->hasGlobalStorage())
      return;

  if (DeclMatcher(S, Decls, Second).FoundDeclInUse() ||
      DeclMatcher(S, Decls, Third).FoundDeclInUse() ||
      DeclMatcher(S, Decls, Body).FoundDeclInUse())
    return;

  // Load decl names into diagnostic.
  if (Decls.size() > 4) {
    PDiag << 0;
  } else {
    PDiag << (unsigned)Decls.size();
    for (auto *VD : Decls)
      PDiag << VD->getDeclName();
  }

  for (auto Range : Ranges)
    PDiag << Range;

  S.Diag(Ranges.begin()->getBegin(), PDiag);
}

// If Statement is an incemement or decrement, return true and sets the
// variables Increment and DRE.
bool ProcessIterationStmt(Sema &S, Stmt* Statement, bool &Increment,
                          DeclRefExpr *&DRE) {
  if (auto Cleanups = dyn_cast<ExprWithCleanups>(Statement))
    if (!Cleanups->cleanupsHaveSideEffects())
      Statement = Cleanups->getSubExpr();

  if (UnaryOperator *UO = dyn_cast<UnaryOperator>(Statement)) {
    switch (UO->getOpcode()) {
      default: return false;
      case UO_PostInc:
      case UO_PreInc:
        Increment = true;
        break;
      case UO_PostDec:
      case UO_PreDec:
        Increment = false;
        break;
    }
    DRE = dyn_cast<DeclRefExpr>(UO->getSubExpr());
    return DRE;
  }

  if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(Statement)) {
    FunctionDecl *FD = Call->getDirectCallee();
    if (!FD || !FD->isOverloadedOperator()) return false;
    switch (FD->getOverloadedOperator()) {
      default: return false;
      case OO_PlusPlus:
        Increment = true;
        break;
      case OO_MinusMinus:
        Increment = false;
        break;
    }
    DRE = dyn_cast<DeclRefExpr>(Call->getArg(0));
    return DRE;
  }

  return false;
}

// A visitor to determine if a continue or break statement is a
// subexpression.
class BreakContinueFinder : public ConstEvaluatedExprVisitor<BreakContinueFinder> {
  SourceLocation BreakLoc;
  SourceLocation ContinueLoc;
  bool InSwitch = false;

public:
  BreakContinueFinder(Sema &S, const Stmt* Body) :
      Inherited(S.Context) {
    Visit(Body);
  }

  typedef ConstEvaluatedExprVisitor<BreakContinueFinder> Inherited;

  void VisitContinueStmt(const ContinueStmt* E) {
    ContinueLoc = E->getContinueLoc();
  }

  void VisitBreakStmt(const BreakStmt* E) {
    if (!InSwitch)
      BreakLoc = E->getBreakLoc();
  }

  void VisitSwitchStmt(const SwitchStmt* S) {
    if (const Stmt *Init = S->getInit())
      Visit(Init);
    if (const Stmt *CondVar = S->getConditionVariableDeclStmt())
      Visit(CondVar);
    if (const Stmt *Cond = S->getCond())
      Visit(Cond);

    // Don't return break statements from the body of a switch.
    InSwitch = true;
    if (const Stmt *Body = S->getBody())
      Visit(Body);
    InSwitch = false;
  }

  void VisitForStmt(const ForStmt *S) {
    // Only visit the init statement of a for loop; the body
    // has a different break/continue scope.
    if (const Stmt *Init = S->getInit())
      Visit(Init);
  }

  void VisitWhileStmt(const WhileStmt *) {
    // Do nothing; the children of a while loop have a different
    // break/continue scope.
  }

  void VisitDoStmt(const DoStmt *) {
    // Do nothing; the children of a while loop have a different
    // break/continue scope.
  }

  void VisitCXXForRangeStmt(const CXXForRangeStmt *S) {
    // Only visit the initialization of a for loop; the body
    // has a different break/continue scope.
    if (const Stmt *Range = S->getRangeStmt())
      Visit(Range);
    if (const Stmt *Begin = S->getBeginStmt())
      Visit(Begin);
    if (const Stmt *End = S->getEndStmt())
      Visit(End);
  }

  void VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S) {
    // Only visit the initialization of a for loop; the body
    // has a different break/continue scope.
    if (const Stmt *Element = S->getElement())
      Visit(Element);
    if (const Stmt *Collection = S->getCollection())
      Visit(Collection);
  }

  bool ContinueFound() { return ContinueLoc.isValid(); }
  bool BreakFound() { return BreakLoc.isValid(); }
  SourceLocation GetContinueLoc() { return ContinueLoc; }
  SourceLocation GetBreakLoc() { return BreakLoc; }

};  // end class BreakContinueFinder

// Emit a warning when a loop increment/decrement appears twice per loop
// iteration.  The conditions which trigger this warning are:
// 1) The last statement in the loop body and the third expression in the
//    for loop are both increment or both decrement of the same variable
// 2) No continue statements in the loop body.
void CheckForRedundantIteration(Sema &S, Expr *Third, Stmt *Body) {
  // Return when there is nothing to check.
  if (!Body || !Third) return;

  if (S.Diags.isIgnored(diag::warn_redundant_loop_iteration,
                        Third->getLocStart()))
    return;

  // Get the last statement from the loop body.
  CompoundStmt *CS = dyn_cast<CompoundStmt>(Body);
  if (!CS || CS->body_empty()) return;
  Stmt *LastStmt = CS->body_back();
  if (!LastStmt) return;

  bool LoopIncrement, LastIncrement;
  DeclRefExpr *LoopDRE, *LastDRE;

  if (!ProcessIterationStmt(S, Third, LoopIncrement, LoopDRE)) return;
  if (!ProcessIterationStmt(S, LastStmt, LastIncrement, LastDRE)) return;

  // Check that the two statements are both increments or both decrements
  // on the same variable.
  if (LoopIncrement != LastIncrement ||
      LoopDRE->getDecl() != LastDRE->getDecl()) return;

  if (BreakContinueFinder(S, Body).ContinueFound()) return;

  S.Diag(LastDRE->getLocation(), diag::warn_redundant_loop_iteration)
       << LastDRE->getDecl() << LastIncrement;
  S.Diag(LoopDRE->getLocation(), diag::note_loop_iteration_here)
       << LoopIncrement;
}

1708} // end namespace


1711void Sema::CheckBreakContinueBinding(Expr *E) {
if (!E || getLangOpts().CPlusPlus)
  return;
BreakContinueFinder BCFinder(*this, E);
Scope *BreakParent = CurScope->getBreakParent();
if (BCFinder.BreakFound() && BreakParent) {
  if (BreakParent->getFlags() & Scope::SwitchScope) {
    Diag(BCFinder.GetBreakLoc(), diag::warn_break_binds_to_switch);
  } else {
    Diag(BCFinder.GetBreakLoc(), diag::warn_loop_ctrl_binds_to_inner)
        << "break";
  }
} else if (BCFinder.ContinueFound() && CurScope->getContinueParent()) {
  Diag(BCFinder.GetContinueLoc(), diag::warn_loop_ctrl_binds_to_inner)
      << "continue";
}
1727}

1729StmtResult Sema::ActOnForStmt(SourceLocation ForLoc, SourceLocation LParenLoc,
                            Stmt *First, ConditionResult Second,
                            FullExprArg third, SourceLocation RParenLoc,
                            Stmt *Body) {
if (Second.isInvalid())
  return StmtError();

if (!getLangOpts().CPlusPlus) {
  if (DeclStmt *DS = dyn_cast_or_null<DeclStmt>(First)) {
    // C99 6.8.5p3: The declaration part of a 'for' statement shall only
    // declare identifiers for objects having storage class 'auto' or
    // 'register'.
    for (auto *DI : DS->decls()) {
      VarDecl *VD = dyn_cast<VarDecl>(DI);
      if (VD && VD->isLocalVarDecl() && !VD->hasLocalStorage())
        VD = nullptr;
      if (!VD) {
        Diag(DI->getLocation(), diag::err_non_local_variable_decl_in_for);
        DI->setInvalidDecl();
      }
    }
  }
}

CheckBreakContinueBinding(Second.get().second);
CheckBreakContinueBinding(third.get());

if (!Second.get().first)
  CheckForLoopConditionalStatement(*this, Second.get().second, third.get(),
                                   Body);
CheckForRedundantIteration(*this, third.get(), Body);

if (Second.get().second &&
    !Diags.isIgnored(diag::warn_comma_operator,
                     Second.get().second->getExprLoc()))
  CommaVisitor(*this).Visit(Second.get().second);

Expr *Third  = third.release().getAs<Expr>();

DiagnoseUnusedExprResult(First);
DiagnoseUnusedExprResult(Third);
DiagnoseUnusedExprResult(Body);

if (isa<NullStmt>(Body))
  getCurCompoundScope().setHasEmptyLoopBodies();

return new (Context)
    ForStmt(Context, First, Second.get().second, Second.get().first, Third,
            Body, ForLoc, LParenLoc, RParenLoc);
1778}

1780/// In an Objective C collection iteration statement:
1781///   for (x in y)
1782/// x can be an arbitrary l-value expression.  Bind it up as a
1783/// full-expression.
1784StmtResult Sema::ActOnForEachLValueExpr(Expr *E) {
// Reduce placeholder expressions here.  Note that this rejects the
// use of pseudo-object l-values in this position.
ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return StmtError();
E = result.get();

ExprResult FullExpr = ActOnFinishFullExpr(E);
if (FullExpr.isInvalid())
  return StmtError();
return StmtResult(static_cast<Stmt*>(FullExpr.get()));
1795}

1797ExprResult
1798Sema::CheckObjCForCollectionOperand(SourceLocation forLoc, Expr *collection) {
if (!collection)
  return ExprError();

ExprResult result = CorrectDelayedTyposInExpr(collection);
if (!result.isUsable())
  return ExprError();
collection = result.get();

// Bail out early if we've got a type-dependent expression.
if (collection->isTypeDependent()) return collection;

// Perform normal l-value conversion.
result = DefaultFunctionArrayLvalueConversion(collection);
if (result.isInvalid())
  return ExprError();
collection = result.get();

// The operand needs to have object-pointer type.
// TODO: should we do a contextual conversion?
const ObjCObjectPointerType *pointerType =
  collection->getType()->getAs<ObjCObjectPointerType>();
if (!pointerType)
  return Diag(forLoc, diag::err_collection_expr_type)
           << collection->getType() << collection->getSourceRange();

// Check that the operand provides
//   - countByEnumeratingWithState:objects:count:
const ObjCObjectType *objectType = pointerType->getObjectType();
ObjCInterfaceDecl *iface = objectType->getInterface();

// If we have a forward-declared type, we can't do this check.
// Under ARC, it is an error not to have a forward-declared class.
if (iface &&
    (getLangOpts().ObjCAutoRefCount
         ? RequireCompleteType(forLoc, QualType(objectType, 0),
                               diag::err_arc_collection_forward, collection)
         : !isCompleteType(forLoc, QualType(objectType, 0)))) {
  // Otherwise, if we have any useful type information, check that
  // the type declares the appropriate method.
} else if (iface || !objectType->qual_empty()) {
  IdentifierInfo *selectorIdents[] = {
    &Context.Idents.get("countByEnumeratingWithState"),
    &Context.Idents.get("objects"),
    &Context.Idents.get("count")
  };
  Selector selector = Context.Selectors.getSelector(3, &selectorIdents[0]);

  ObjCMethodDecl *method = nullptr;

  // If there's an interface, look in both the public and private APIs.
  if (iface) {
    method = iface->lookupInstanceMethod(selector);
    if (!method) method = iface->lookupPrivateMethod(selector);
  }

  // Also check protocol qualifiers.
  if (!method)
    method = LookupMethodInQualifiedType(selector, pointerType,
                                         /*instance*/ true);

  // If we didn't find it anywhere, give up.
  if (!method) {
    Diag(forLoc, diag::warn_collection_expr_type)
      << collection->getType() << selector << collection->getSourceRange();
  }

  // TODO: check for an incompatible signature?
}

// Wrap up any cleanups in the expression.
return collection;
1870}

1872StmtResult
1873Sema::ActOnObjCForCollectionStmt(SourceLocation ForLoc,
                               Stmt *First, Expr *collection,
                               SourceLocation RParenLoc) {
getCurFunction()->setHasBranchProtectedScope();

ExprResult CollectionExprResult =
  CheckObjCForCollectionOperand(ForLoc, collection);

if (First) {
  QualType FirstType;
  if (DeclStmt *DS = dyn_cast<DeclStmt>(First)) {
    if (!DS->isSingleDecl())
      return StmtError(Diag((*DS->decl_begin())->getLocation(),
                       diag::err_toomany_element_decls));

    VarDecl *D = dyn_cast<VarDecl>(DS->getSingleDecl());
    if (!D || D->isInvalidDecl())
      return StmtError();
    
    FirstType = D->getType();
    // C99 6.8.5p3: The declaration part of a 'for' statement shall only
    // declare identifiers for objects having storage class 'auto' or
    // 'register'.
    if (!D->hasLocalStorage())
      return StmtError(Diag(D->getLocation(),
                            diag::err_non_local_variable_decl_in_for));

    // If the type contained 'auto', deduce the 'auto' to 'id'.
    if (FirstType->getContainedAutoType()) {
      OpaqueValueExpr OpaqueId(D->getLocation(), Context.getObjCIdType(),
                               VK_RValue);
      Expr *DeducedInit = &OpaqueId;
      if (DeduceAutoType(D->getTypeSourceInfo(), DeducedInit, FirstType) ==
              DAR_Failed)
        DiagnoseAutoDeductionFailure(D, DeducedInit);
      if (FirstType.isNull()) {
        D->setInvalidDecl();
        return StmtError();
      }

      D->setType(FirstType);

      if (!inTemplateInstantiation()) {
        SourceLocation Loc =
            D->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
        Diag(Loc, diag::warn_auto_var_is_id)
          << D->getDeclName();
      }
    }

  } else {
    Expr *FirstE = cast<Expr>(First);
    if (!FirstE->isTypeDependent() && !FirstE->isLValue())
      return StmtError(Diag(First->getLocStart(),
                 diag::err_selector_element_not_lvalue)
        << First->getSourceRange());

    FirstType = static_cast<Expr*>(First)->getType();
    if (FirstType.isConstQualified())
      Diag(ForLoc, diag::err_selector_element_const_type)
        << FirstType << First->getSourceRange();
  }
  if (!FirstType->isDependentType() &&
      !FirstType->isObjCObjectPointerType() &&
      !FirstType->isBlockPointerType())
      return StmtError(Diag(ForLoc, diag::err_selector_element_type)
                         << FirstType << First->getSourceRange());
}

if (CollectionExprResult.isInvalid())
  return StmtError();

CollectionExprResult = ActOnFinishFullExpr(CollectionExprResult.get());
if (CollectionExprResult.isInvalid())
  return StmtError();

return new (Context) ObjCForCollectionStmt(First, CollectionExprResult.get(),
                                           nullptr, ForLoc, RParenLoc);
1951}

1953/// Finish building a variable declaration for a for-range statement.
1954/// \return true if an error occurs.
1955static bool FinishForRangeVarDecl(Sema &SemaRef, VarDecl *Decl, Expr *Init,
                                SourceLocation Loc, int DiagID) {
if (Decl->getType()->isUndeducedType()) {
  ExprResult Res = SemaRef.CorrectDelayedTyposInExpr(Init);
  if (!Res.isUsable()) {
    Decl->setInvalidDecl();
    return true;
  }
  Init = Res.get();
}

// Deduce the type for the iterator variable now rather than leaving it to
// AddInitializerToDecl, so we can produce a more suitable diagnostic.
QualType InitType;
if ((!isa<InitListExpr>(Init) && Init->getType()->isVoidType()) ||
    SemaRef.DeduceAutoType(Decl->getTypeSourceInfo(), Init, InitType) ==
        Sema::DAR_Failed)
  SemaRef.Diag(Loc, DiagID) << Init->getType();
if (InitType.isNull()) {
  Decl->setInvalidDecl();
  return true;
}
Decl->setType(InitType);

// In ARC, infer lifetime.
// FIXME: ARC may want to turn this into 'const __unsafe_unretained' if
// we're doing the equivalent of fast iteration.
if (SemaRef.getLangOpts().ObjCAutoRefCount &&
    SemaRef.inferObjCARCLifetime(Decl))
  Decl->setInvalidDecl();

SemaRef.AddInitializerToDecl(Decl, Init, /*DirectInit=*/false);
SemaRef.FinalizeDeclaration(Decl);
SemaRef.CurContext->addHiddenDecl(Decl);
return false;
1990}

1992namespace {
1993// An enum to represent whether something is dealing with a call to begin()
1994// or a call to end() in a range-based for loop.
1995enum BeginEndFunction {
BEF_begin,
BEF_end
1998};

2000/// Produce a note indicating which begin/end function was implicitly called
2001/// by a C++11 for-range statement. This is often not obvious from the code,
2002/// nor from the diagnostics produced when analysing the implicit expressions
2003/// required in a for-range statement.
2004void NoteForRangeBeginEndFunction(Sema &SemaRef, Expr *E,
                                BeginEndFunction BEF) {
CallExpr *CE = dyn_cast<CallExpr>(E);
if (!CE)
  return;
FunctionDecl *D = dyn_cast<FunctionDecl>(CE->getCalleeDecl());
if (!D)
  return;
SourceLocation Loc = D->getLocation();

std::string Description;
bool IsTemplate = false;
if (FunctionTemplateDecl *FunTmpl = D->getPrimaryTemplate()) {
  Description = SemaRef.getTemplateArgumentBindingsText(
    FunTmpl->getTemplateParameters(), *D->getTemplateSpecializationArgs());
  IsTemplate = true;
}

SemaRef.Diag(Loc, diag::note_for_range_begin_end)
  << BEF << IsTemplate << Description << E->getType();
2024}

2026/// Build a variable declaration for a for-range statement.
2027VarDecl *BuildForRangeVarDecl(Sema &SemaRef, SourceLocation Loc,
                            QualType Type, StringRef Name) {
DeclContext *DC = SemaRef.CurContext;
IdentifierInfo *II = &SemaRef.PP.getIdentifierTable().get(Name);
TypeSourceInfo *TInfo = SemaRef.Context.getTrivialTypeSourceInfo(Type, Loc);
VarDecl *Decl = VarDecl::Create(SemaRef.Context, DC, Loc, Loc, II, Type,
                                TInfo, SC_None);
Decl->setImplicit();
return Decl;
2036}

2038}

2040static bool ObjCEnumerationCollection(Expr *Collection) {
return !Collection->isTypeDependent()
        && Collection->getType()->getAs<ObjCObjectPointerType>() != nullptr;
2043}

2045/// ActOnCXXForRangeStmt - Check and build a C++11 for-range statement.
2046///
2047/// C++11 [stmt.ranged]:
2048///   A range-based for statement is equivalent to
2049///
2050///   {
2051///     auto && __range = range-init;
2052///     for ( auto __begin = begin-expr,
2053///           __end = end-expr;
2054///           __begin != __end;
2055///           ++__begin ) {
2056///       for-range-declaration = *__begin;
2057///       statement
2058///     }
2059///   }
2060///
2061/// The body of the loop is not available yet, since it cannot be analysed until
2062/// we have determined the type of the for-range-declaration.
2063StmtResult Sema::ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
                                    SourceLocation CoawaitLoc, Stmt *First,
                                    SourceLocation ColonLoc, Expr *Range,
                                    SourceLocation RParenLoc,
                                    BuildForRangeKind Kind) {
if (!First)
  return StmtError();

if (Range && ObjCEnumerationCollection(Range))
  return ActOnObjCForCollectionStmt(ForLoc, First, Range, RParenLoc);

DeclStmt *DS = dyn_cast<DeclStmt>(First);
assert(DS && "first part of for range not a decl stmt")(static_cast <bool> (DS && "first part of for range not a decl stmt"
) ? void (0) : __assert_fail ("DS && \"first part of for range not a decl stmt\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 2075, __extension__ __PRETTY_FUNCTION__));

if (!DS->isSingleDecl()) {
  Diag(DS->getStartLoc(), diag::err_type_defined_in_for_range);
  return StmtError();
}

Decl *LoopVar = DS->getSingleDecl();
if (LoopVar->isInvalidDecl() || !Range ||
    DiagnoseUnexpandedParameterPack(Range, UPPC_Expression)) {
  LoopVar->setInvalidDecl();
  return StmtError();
}

// Build the coroutine state immediately and not later during template
// instantiation
if (!CoawaitLoc.isInvalid()) {
  if (!ActOnCoroutineBodyStart(S, CoawaitLoc, "co_await"))
    return StmtError();
}

// Build  auto && __range = range-init
// Divide by 2, since the variables are in the inner scope (loop body).
const auto DepthStr = std::to_string(S->getDepth() / 2);
SourceLocation RangeLoc = Range->getLocStart();
VarDecl *RangeVar = BuildForRangeVarDecl(*this, RangeLoc,
                                         Context.getAutoRRefDeductType(),
                                         std::string("__range") + DepthStr);
if (FinishForRangeVarDecl(*this, RangeVar, Range, RangeLoc,
                          diag::err_for_range_deduction_failure)) {
  LoopVar->setInvalidDecl();
  return StmtError();
}

// Claim the type doesn't contain auto: we've already done the checking.
DeclGroupPtrTy RangeGroup =
    BuildDeclaratorGroup(MutableArrayRef<Decl *>((Decl **)&RangeVar, 1));
StmtResult RangeDecl = ActOnDeclStmt(RangeGroup, RangeLoc, RangeLoc);
if (RangeDecl.isInvalid()) {
  LoopVar->setInvalidDecl();
  return StmtError();
}

return BuildCXXForRangeStmt(ForLoc, CoawaitLoc, ColonLoc, RangeDecl.get(),
                            /*BeginStmt=*/nullptr, /*EndStmt=*/nullptr,
                            /*Cond=*/nullptr, /*Inc=*/nullptr,
                            DS, RParenLoc, Kind);
2122}

2124/// \brief Create the initialization, compare, and increment steps for
2125/// the range-based for loop expression.
2126/// This function does not handle array-based for loops,
2127/// which are created in Sema::BuildCXXForRangeStmt.
2128///
2129/// \returns a ForRangeStatus indicating success or what kind of error occurred.
2130/// BeginExpr and EndExpr are set and FRS_Success is returned on success;
2131/// CandidateSet and BEF are set and some non-success value is returned on
2132/// failure.
2133static Sema::ForRangeStatus
2134BuildNonArrayForRange(Sema &SemaRef, Expr *BeginRange, Expr *EndRange,
                    QualType RangeType, VarDecl *BeginVar, VarDecl *EndVar,
                    SourceLocation ColonLoc, SourceLocation CoawaitLoc,
                    OverloadCandidateSet *CandidateSet, ExprResult *BeginExpr,
                    ExprResult *EndExpr, BeginEndFunction *BEF) {
DeclarationNameInfo BeginNameInfo(
    &SemaRef.PP.getIdentifierTable().get("begin"), ColonLoc);
DeclarationNameInfo EndNameInfo(&SemaRef.PP.getIdentifierTable().get("end"),
                                ColonLoc);

LookupResult BeginMemberLookup(SemaRef, BeginNameInfo,
                               Sema::LookupMemberName);
LookupResult EndMemberLookup(SemaRef, EndNameInfo, Sema::LookupMemberName);

if (CXXRecordDecl *D = RangeType->getAsCXXRecordDecl()) {
  // - if _RangeT is a class type, the unqualified-ids begin and end are
  //   looked up in the scope of class _RangeT as if by class member access
  //   lookup (3.4.5), and if either (or both) finds at least one
  //   declaration, begin-expr and end-expr are __range.begin() and
  //   __range.end(), respectively;
  SemaRef.LookupQualifiedName(BeginMemberLookup, D);
  SemaRef.LookupQualifiedName(EndMemberLookup, D);

  if (BeginMemberLookup.empty() != EndMemberLookup.empty()) {
    SourceLocation RangeLoc = BeginVar->getLocation();
    *BEF = BeginMemberLookup.empty() ? BEF_end : BEF_begin;

    SemaRef.Diag(RangeLoc, diag::err_for_range_member_begin_end_mismatch)
        << RangeLoc << BeginRange->getType() << *BEF;
    return Sema::FRS_DiagnosticIssued;
  }
} else {
  // - otherwise, begin-expr and end-expr are begin(__range) and
  //   end(__range), respectively, where begin and end are looked up with
  //   argument-dependent lookup (3.4.2). For the purposes of this name
  //   lookup, namespace std is an associated namespace.

}

*BEF = BEF_begin;
Sema::ForRangeStatus RangeStatus =
    SemaRef.BuildForRangeBeginEndCall(ColonLoc, ColonLoc, BeginNameInfo,
                                      BeginMemberLookup, CandidateSet,
                                      BeginRange, BeginExpr);

if (RangeStatus != Sema::FRS_Success) {
  if (RangeStatus == Sema::FRS_DiagnosticIssued)
    SemaRef.Diag(BeginRange->getLocStart(), diag::note_in_for_range)
        << ColonLoc << BEF_begin << BeginRange->getType();
  return RangeStatus;
}
if (!CoawaitLoc.isInvalid()) {
  // FIXME: getCurScope() should not be used during template instantiation.
  // We should pick up the set of unqualified lookup results for operator
  // co_await during the initial parse.
  *BeginExpr = SemaRef.ActOnCoawaitExpr(SemaRef.getCurScope(), ColonLoc,
                                        BeginExpr->get());
  if (BeginExpr->isInvalid())
    return Sema::FRS_DiagnosticIssued;
}
if (FinishForRangeVarDecl(SemaRef, BeginVar, BeginExpr->get(), ColonLoc,
                          diag::err_for_range_iter_deduction_failure)) {
  NoteForRangeBeginEndFunction(SemaRef, BeginExpr->get(), *BEF);
  return Sema::FRS_DiagnosticIssued;
}

*BEF = BEF_end;
RangeStatus =
    SemaRef.BuildForRangeBeginEndCall(ColonLoc, ColonLoc, EndNameInfo,
                                      EndMemberLookup, CandidateSet,
                                      EndRange, EndExpr);
if (RangeStatus != Sema::FRS_Success) {
  if (RangeStatus == Sema::FRS_DiagnosticIssued)
    SemaRef.Diag(EndRange->getLocStart(), diag::note_in_for_range)
        << ColonLoc << BEF_end << EndRange->getType();
  return RangeStatus;
}
if (FinishForRangeVarDecl(SemaRef, EndVar, EndExpr->get(), ColonLoc,
                          diag::err_for_range_iter_deduction_failure)) {
  NoteForRangeBeginEndFunction(SemaRef, EndExpr->get(), *BEF);
  return Sema::FRS_DiagnosticIssued;
}
return Sema::FRS_Success;
2217}

2219/// Speculatively attempt to dereference an invalid range expression.
2220/// If the attempt fails, this function will return a valid, null StmtResult
2221/// and emit no diagnostics.
2222static StmtResult RebuildForRangeWithDereference(Sema &SemaRef, Scope *S,
                                               SourceLocation ForLoc,
                                               SourceLocation CoawaitLoc,
                                               Stmt *LoopVarDecl,
                                               SourceLocation ColonLoc,
                                               Expr *Range,
                                               SourceLocation RangeLoc,
                                               SourceLocation RParenLoc) {
// Determine whether we can rebuild the for-range statement with a
// dereferenced range expression.
ExprResult AdjustedRange;
{
  Sema::SFINAETrap Trap(SemaRef);

  AdjustedRange = SemaRef.BuildUnaryOp(S, RangeLoc, UO_Deref, Range);
  if (AdjustedRange.isInvalid())
    return StmtResult();

  StmtResult SR = SemaRef.ActOnCXXForRangeStmt(
      S, ForLoc, CoawaitLoc, LoopVarDecl, ColonLoc, AdjustedRange.get(),
      RParenLoc, Sema::BFRK_Check);
  if (SR.isInvalid())
    return StmtResult();
}

// The attempt to dereference worked well enough that it could produce a valid
// loop. Produce a fixit, and rebuild the loop with diagnostics enabled, in
// case there are any other (non-fatal) problems with it.
SemaRef.Diag(RangeLoc, diag::err_for_range_dereference)
  << Range->getType() << FixItHint::CreateInsertion(RangeLoc, "*");
return SemaRef.ActOnCXXForRangeStmt(S, ForLoc, CoawaitLoc, LoopVarDecl,
                                    ColonLoc, AdjustedRange.get(), RParenLoc,
                                    Sema::BFRK_Rebuild);
2255}

2257namespace {
2258/// RAII object to automatically invalidate a declaration if an error occurs.
2259struct InvalidateOnErrorScope {
InvalidateOnErrorScope(Sema &SemaRef, Decl *D, bool Enabled)
    : Trap(SemaRef.Diags), D(D), Enabled(Enabled) {}
~InvalidateOnErrorScope() {
  if (Enabled && Trap.hasErrorOccurred())
    D->setInvalidDecl();
}

DiagnosticErrorTrap Trap;
Decl *D;
bool Enabled;
2270};
2271}

2273/// BuildCXXForRangeStmt - Build or instantiate a C++11 for-range statement.
2274StmtResult
2275Sema::BuildCXXForRangeStmt(SourceLocation ForLoc, SourceLocation CoawaitLoc,
                         SourceLocation ColonLoc, Stmt *RangeDecl,
                         Stmt *Begin, Stmt *End, Expr *Cond,
                         Expr *Inc, Stmt *LoopVarDecl,
                         SourceLocation RParenLoc, BuildForRangeKind Kind) {
// FIXME: This should not be used during template instantiation. We should
// pick up the set of unqualified lookup results for the != and + operators
// in the initial parse.
//
// Testcase (accepts-invalid):
//   template<typename T> void f() { for (auto x : T()) {} }
//   namespace N { struct X { X begin(); X end(); int operator*(); }; }
//   bool operator!=(N::X, N::X); void operator++(N::X);
//   void g() { f<N::X>(); }
Scope *S = getCurScope();

DeclStmt *RangeDS = cast<DeclStmt>(RangeDecl);
VarDecl *RangeVar = cast<VarDecl>(RangeDS->getSingleDecl());
QualType RangeVarType = RangeVar->getType();

DeclStmt *LoopVarDS = cast<DeclStmt>(LoopVarDecl);
VarDecl *LoopVar = cast<VarDecl>(LoopVarDS->getSingleDecl());

// If we hit any errors, mark the loop variable as invalid if its type
// contains 'auto'.
InvalidateOnErrorScope Invalidate(*this, LoopVar,
                                  LoopVar->getType()->isUndeducedType());

StmtResult BeginDeclStmt = Begin;
StmtResult EndDeclStmt = End;
ExprResult NotEqExpr = Cond, IncrExpr = Inc;

if (RangeVarType->isDependentType()) {
  // The range is implicitly used as a placeholder when it is dependent.
  RangeVar->markUsed(Context);

  // Deduce any 'auto's in the loop variable as 'DependentTy'. We'll fill
  // them in properly when we instantiate the loop.
  if (!LoopVar->isInvalidDecl() && Kind != BFRK_Check) {
    if (auto *DD = dyn_cast<DecompositionDecl>(LoopVar))
      for (auto *Binding : DD->bindings())
        Binding->setType(Context.DependentTy);
    LoopVar->setType(SubstAutoType(LoopVar->getType(), Context.DependentTy));
  }
} else if (!BeginDeclStmt.get()) {
  SourceLocation RangeLoc = RangeVar->getLocation();

  const QualType RangeVarNonRefType = RangeVarType.getNonReferenceType();

  ExprResult BeginRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType,
                                              VK_LValue, ColonLoc);
  if (BeginRangeRef.isInvalid())
    return StmtError();

  ExprResult EndRangeRef = BuildDeclRefExpr(RangeVar, RangeVarNonRefType,
                                            VK_LValue, ColonLoc);
  if (EndRangeRef.isInvalid())
    return StmtError();

  QualType AutoType = Context.getAutoDeductType();
  Expr *Range = RangeVar->getInit();
  if (!Range)
    return StmtError();
  QualType RangeType = Range->getType();

  if (RequireCompleteType(RangeLoc, RangeType,
                          diag::err_for_range_incomplete_type))
    return StmtError();

  // Build auto __begin = begin-expr, __end = end-expr.
  // Divide by 2, since the variables are in the inner scope (loop body).
  const auto DepthStr = std::to_string(S->getDepth() / 2);
  VarDecl *BeginVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType,
                                           std::string("__begin") + DepthStr);
  VarDecl *EndVar = BuildForRangeVarDecl(*this, ColonLoc, AutoType,
                                         std::string("__end") + DepthStr);

  // Build begin-expr and end-expr and attach to __begin and __end variables.
  ExprResult BeginExpr, EndExpr;
  if (const ArrayType *UnqAT = RangeType->getAsArrayTypeUnsafe()) {
    // - if _RangeT is an array type, begin-expr and end-expr are __range and
    //   __range + __bound, respectively, where __bound is the array bound. If
    //   _RangeT is an array of unknown size or an array of incomplete type,
    //   the program is ill-formed;

    // begin-expr is __range.
    BeginExpr = BeginRangeRef;
    if (!CoawaitLoc.isInvalid()) {
      BeginExpr = ActOnCoawaitExpr(S, ColonLoc, BeginExpr.get());
      if (BeginExpr.isInvalid())
        return StmtError();
    }
    if (FinishForRangeVarDecl(*this, BeginVar, BeginRangeRef.get(), ColonLoc,
                              diag::err_for_range_iter_deduction_failure)) {
      NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
      return StmtError();
    }

    // Find the array bound.
    ExprResult BoundExpr;
    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(UnqAT))
      BoundExpr = IntegerLiteral::Create(
          Context, CAT->getSize(), Context.getPointerDiffType(), RangeLoc);
    else if (const VariableArrayType *VAT =
             dyn_cast<VariableArrayType>(UnqAT)) {
      // For a variably modified type we can't just use the expression within
      // the array bounds, since we don't want that to be re-evaluated here.
      // Rather, we need to determine what it was when the array was first
      // created - so we resort to using sizeof(vla)/sizeof(element).
      // For e.g.
      //  void f(int b) { 
      //    int vla[b];
      //    b = -1;   <-- This should not affect the num of iterations below
      //    for (int &c : vla) { .. }
      //  }

      // FIXME: This results in codegen generating IR that recalculates the
      // run-time number of elements (as opposed to just using the IR Value
      // that corresponds to the run-time value of each bound that was
      // generated when the array was created.) If this proves too embarassing
      // even for unoptimized IR, consider passing a magic-value/cookie to
      // codegen that then knows to simply use that initial llvm::Value (that
      // corresponds to the bound at time of array creation) within
      // getelementptr.  But be prepared to pay the price of increasing a
      // customized form of coupling between the two components - which  could
      // be hard to maintain as the codebase evolves.

      ExprResult SizeOfVLAExprR = ActOnUnaryExprOrTypeTraitExpr(
          EndVar->getLocation(), UETT_SizeOf,
          /*isType=*/true,
          CreateParsedType(VAT->desugar(), Context.getTrivialTypeSourceInfo(
                                               VAT->desugar(), RangeLoc))
              .getAsOpaquePtr(),
          EndVar->getSourceRange());
      if (SizeOfVLAExprR.isInvalid())
        return StmtError();
      
      ExprResult SizeOfEachElementExprR = ActOnUnaryExprOrTypeTraitExpr(
          EndVar->getLocation(), UETT_SizeOf,
          /*isType=*/true,
          CreateParsedType(VAT->desugar(),
                           Context.getTrivialTypeSourceInfo(
                               VAT->getElementType(), RangeLoc))
              .getAsOpaquePtr(),
          EndVar->getSourceRange());
      if (SizeOfEachElementExprR.isInvalid())
        return StmtError();

      BoundExpr =
          ActOnBinOp(S, EndVar->getLocation(), tok::slash,
                     SizeOfVLAExprR.get(), SizeOfEachElementExprR.get());
      if (BoundExpr.isInvalid())
        return StmtError();
      
    } else {
      // Can't be a DependentSizedArrayType or an IncompleteArrayType since
      // UnqAT is not incomplete and Range is not type-dependent.
      llvm_unreachable("Unexpected array type in for-range")::llvm::llvm_unreachable_internal("Unexpected array type in for-range"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 2432);
    }

    // end-expr is __range + __bound.
    EndExpr = ActOnBinOp(S, ColonLoc, tok::plus, EndRangeRef.get(),
                         BoundExpr.get());
    if (EndExpr.isInvalid())
      return StmtError();
    if (FinishForRangeVarDecl(*this, EndVar, EndExpr.get(), ColonLoc,
                              diag::err_for_range_iter_deduction_failure)) {
      NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end);
      return StmtError();
    }
  } else {
    OverloadCandidateSet CandidateSet(RangeLoc,
                                      OverloadCandidateSet::CSK_Normal);
    BeginEndFunction BEFFailure;
    ForRangeStatus RangeStatus = BuildNonArrayForRange(
        *this, BeginRangeRef.get(), EndRangeRef.get(), RangeType, BeginVar,
        EndVar, ColonLoc, CoawaitLoc, &CandidateSet, &BeginExpr, &EndExpr,
        &BEFFailure);

    if (Kind == BFRK_Build && RangeStatus == FRS_NoViableFunction &&
        BEFFailure == BEF_begin) {
      // If the range is being built from an array parameter, emit a
      // a diagnostic that it is being treated as a pointer.
      if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Range)) {
        if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl())) {
          QualType ArrayTy = PVD->getOriginalType();
          QualType PointerTy = PVD->getType();
          if (PointerTy->isPointerType() && ArrayTy->isArrayType()) {
            Diag(Range->getLocStart(), diag::err_range_on_array_parameter)
              << RangeLoc << PVD << ArrayTy << PointerTy;
            Diag(PVD->getLocation(), diag::note_declared_at);
            return StmtError();
          }
        }
      }

      // If building the range failed, try dereferencing the range expression
      // unless a diagnostic was issued or the end function is problematic.
      StmtResult SR = RebuildForRangeWithDereference(*this, S, ForLoc,
                                                     CoawaitLoc,
                                                     LoopVarDecl, ColonLoc,
                                                     Range, RangeLoc,
                                                     RParenLoc);
      if (SR.isInvalid() || SR.isUsable())
        return SR;
    }

    // Otherwise, emit diagnostics if we haven't already.
    if (RangeStatus == FRS_NoViableFunction) {
      Expr *Range = BEFFailure ? EndRangeRef.get() : BeginRangeRef.get();
      Diag(Range->getLocStart(), diag::err_for_range_invalid)
          << RangeLoc << Range->getType() << BEFFailure;
      CandidateSet.NoteCandidates(*this, OCD_AllCandidates, Range);
    }
    // Return an error if no fix was discovered.
    if (RangeStatus != FRS_Success)
      return StmtError();
  }

  assert(!BeginExpr.isInvalid() && !EndExpr.isInvalid() &&(static_cast <bool> (!BeginExpr.isInvalid() && !
EndExpr.isInvalid() && "invalid range expression in for loop"
) ? void (0) : __assert_fail ("!BeginExpr.isInvalid() && !EndExpr.isInvalid() && \"invalid range expression in for loop\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 2495, __extension__ __PRETTY_FUNCTION__))
         "invalid range expression in for loop")(static_cast <bool> (!BeginExpr.isInvalid() && !
EndExpr.isInvalid() && "invalid range expression in for loop"
) ? void (0) : __assert_fail ("!BeginExpr.isInvalid() && !EndExpr.isInvalid() && \"invalid range expression in for loop\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 2495, __extension__ __PRETTY_FUNCTION__));

  // C++11 [dcl.spec.auto]p7: BeginType and EndType must be the same.
  // C++1z removes this restriction.
  QualType BeginType = BeginVar->getType(), EndType = EndVar->getType();
  if (!Context.hasSameType(BeginType, EndType)) {
    Diag(RangeLoc, getLangOpts().CPlusPlus17
                       ? diag::warn_for_range_begin_end_types_differ
                       : diag::ext_for_range_begin_end_types_differ)
        << BeginType << EndType;
    NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
    NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end);
  }

  BeginDeclStmt =
      ActOnDeclStmt(ConvertDeclToDeclGroup(BeginVar), ColonLoc, ColonLoc);
  EndDeclStmt =
      ActOnDeclStmt(ConvertDeclToDeclGroup(EndVar), ColonLoc, ColonLoc);

  const QualType BeginRefNonRefType = BeginType.getNonReferenceType();
  ExprResult BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType,
                                         VK_LValue, ColonLoc);
  if (BeginRef.isInvalid())
    return StmtError();

  ExprResult EndRef = BuildDeclRefExpr(EndVar, EndType.getNonReferenceType(),
                                       VK_LValue, ColonLoc);
  if (EndRef.isInvalid())
    return StmtError();

  // Build and check __begin != __end expression.
  NotEqExpr = ActOnBinOp(S, ColonLoc, tok::exclaimequal,
                         BeginRef.get(), EndRef.get());
  if (!NotEqExpr.isInvalid())
    NotEqExpr = CheckBooleanCondition(ColonLoc, NotEqExpr.get());
  if (!NotEqExpr.isInvalid())
    NotEqExpr = ActOnFinishFullExpr(NotEqExpr.get());
  if (NotEqExpr.isInvalid()) {
    Diag(RangeLoc, diag::note_for_range_invalid_iterator)
      << RangeLoc << 0 << BeginRangeRef.get()->getType();
    NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
    if (!Context.hasSameType(BeginType, EndType))
      NoteForRangeBeginEndFunction(*this, EndExpr.get(), BEF_end);
    return StmtError();
  }

  // Build and check ++__begin expression.
  BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType,
                              VK_LValue, ColonLoc);
  if (BeginRef.isInvalid())
    return StmtError();

  IncrExpr = ActOnUnaryOp(S, ColonLoc, tok::plusplus, BeginRef.get());
  if (!IncrExpr.isInvalid() && CoawaitLoc.isValid())
    // FIXME: getCurScope() should not be used during template instantiation.
    // We should pick up the set of unqualified lookup results for operator
    // co_await during the initial parse.
    IncrExpr = ActOnCoawaitExpr(S, CoawaitLoc, IncrExpr.get());
  if (!IncrExpr.isInvalid())
    IncrExpr = ActOnFinishFullExpr(IncrExpr.get());
  if (IncrExpr.isInvalid()) {
    Diag(RangeLoc, diag::note_for_range_invalid_iterator)
      << RangeLoc << 2 << BeginRangeRef.get()->getType() ;
    NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
    return StmtError();
  }

  // Build and check *__begin  expression.
  BeginRef = BuildDeclRefExpr(BeginVar, BeginRefNonRefType,
                              VK_LValue, ColonLoc);
  if (BeginRef.isInvalid())
    return StmtError();

  ExprResult DerefExpr = ActOnUnaryOp(S, ColonLoc, tok::star, BeginRef.get());
  if (DerefExpr.isInvalid()) {
    Diag(RangeLoc, diag::note_for_range_invalid_iterator)
      << RangeLoc << 1 << BeginRangeRef.get()->getType();
    NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
    return StmtError();
  }

  // Attach  *__begin  as initializer for VD. Don't touch it if we're just
  // trying to determine whether this would be a valid range.
  if (!LoopVar->isInvalidDecl() && Kind != BFRK_Check) {
    AddInitializerToDecl(LoopVar, DerefExpr.get(), /*DirectInit=*/false);
    if (LoopVar->isInvalidDecl())
      NoteForRangeBeginEndFunction(*this, BeginExpr.get(), BEF_begin);
  }
}

// Don't bother to actually allocate the result if we're just trying to
// determine whether it would be valid.
if (Kind == BFRK_Check)
  return StmtResult();

return new (Context) CXXForRangeStmt(
    RangeDS, cast_or_null<DeclStmt>(BeginDeclStmt.get()),
    cast_or_null<DeclStmt>(EndDeclStmt.get()), NotEqExpr.get(),
    IncrExpr.get(), LoopVarDS, /*Body=*/nullptr, ForLoc, CoawaitLoc,
    ColonLoc, RParenLoc);
2595}

2597/// FinishObjCForCollectionStmt - Attach the body to a objective-C foreach
2598/// statement.
2599StmtResult Sema::FinishObjCForCollectionStmt(Stmt *S, Stmt *B) {
if (!S || !B)
  return StmtError();
ObjCForCollectionStmt * ForStmt = cast<ObjCForCollectionStmt>(S);

ForStmt->setBody(B);
return S;
2606}

2608// Warn when the loop variable is a const reference that creates a copy.
2609// Suggest using the non-reference type for copies.  If a copy can be prevented
2610// suggest the const reference type that would do so.
2611// For instance, given "for (const &Foo : Range)", suggest
2612// "for (const Foo : Range)" to denote a copy is made for the loop.  If
2613// possible, also suggest "for (const &Bar : Range)" if this type prevents
2614// the copy altogether.
2615static void DiagnoseForRangeReferenceVariableCopies(Sema &SemaRef,
                                                  const VarDecl *VD,
                                                  QualType RangeInitType) {
const Expr *InitExpr = VD->getInit();
if (!InitExpr)
  return;

QualType VariableType = VD->getType();

if (auto Cleanups = dyn_cast<ExprWithCleanups>(InitExpr))
  if (!Cleanups->cleanupsHaveSideEffects())
    InitExpr = Cleanups->getSubExpr();

const MaterializeTemporaryExpr *MTE =
    dyn_cast<MaterializeTemporaryExpr>(InitExpr);

// No copy made.
if (!MTE)
  return;

const Expr *E = MTE->GetTemporaryExpr()->IgnoreImpCasts();

// Searching for either UnaryOperator for dereference of a pointer or
// CXXOperatorCallExpr for handling iterators.
while (!isa<CXXOperatorCallExpr>(E) && !isa<UnaryOperator>(E)) {
  if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(E)) {
    E = CCE->getArg(0);
  } else if (const CXXMemberCallExpr *Call = dyn_cast<CXXMemberCallExpr>(E)) {
    const MemberExpr *ME = cast<MemberExpr>(Call->getCallee());
    E = ME->getBase();
  } else {
    const MaterializeTemporaryExpr *MTE = cast<MaterializeTemporaryExpr>(E);
    E = MTE->GetTemporaryExpr();
  }
  E = E->IgnoreImpCasts();
}

bool ReturnsReference = false;
if (isa<UnaryOperator>(E)) {
  ReturnsReference = true;
} else {
  const CXXOperatorCallExpr *Call = cast<CXXOperatorCallExpr>(E);
  const FunctionDecl *FD = Call->getDirectCallee();
  QualType ReturnType = FD->getReturnType();
  ReturnsReference = ReturnType->isReferenceType();
}

if (ReturnsReference) {
  // Loop variable creates a temporary.  Suggest either to go with
  // non-reference loop variable to indiciate a copy is made, or
  // the correct time to bind a const reference.
  SemaRef.Diag(VD->getLocation(), diag::warn_for_range_const_reference_copy)
      << VD << VariableType << E->getType();
  QualType NonReferenceType = VariableType.getNonReferenceType();
  NonReferenceType.removeLocalConst();
  QualType NewReferenceType =
      SemaRef.Context.getLValueReferenceType(E->getType().withConst());
  SemaRef.Diag(VD->getLocStart(), diag::note_use_type_or_non_reference)
      << NonReferenceType << NewReferenceType << VD->getSourceRange();
} else {
  // The range always returns a copy, so a temporary is always created.
  // Suggest removing the reference from the loop variable.
  SemaRef.Diag(VD->getLocation(), diag::warn_for_range_variable_always_copy)
      << VD << RangeInitType;
  QualType NonReferenceType = VariableType.getNonReferenceType();
  NonReferenceType.removeLocalConst();
  SemaRef.Diag(VD->getLocStart(), diag::note_use_non_reference_type)
      << NonReferenceType << VD->getSourceRange();
}
2684}

2686// Warns when the loop variable can be changed to a reference type to
2687// prevent a copy.  For instance, if given "for (const Foo x : Range)" suggest
2688// "for (const Foo &x : Range)" if this form does not make a copy.
2689static void DiagnoseForRangeConstVariableCopies(Sema &SemaRef,
                                              const VarDecl *VD) {
const Expr *InitExpr = VD->getInit();
if (!InitExpr)
  return;

QualType VariableType = VD->getType();

if (const CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(InitExpr)) {
  if (!CE->getConstructor()->isCopyConstructor())
    return;
} else if (const CastExpr *CE = dyn_cast<CastExpr>(InitExpr)) {
  if (CE->getCastKind() != CK_LValueToRValue)
    return;
} else {
  return;
}

// TODO: Determine a maximum size that a POD type can be before a diagnostic
// should be emitted.  Also, only ignore POD types with trivial copy
// constructors.
if (VariableType.isPODType(SemaRef.Context))
  return;

// Suggest changing from a const variable to a const reference variable
// if doing so will prevent a copy.
SemaRef.Diag(VD->getLocation(), diag::warn_for_range_copy)
    << VD << VariableType << InitExpr->getType();
SemaRef.Diag(VD->getLocStart(), diag::note_use_reference_type)
    << SemaRef.Context.getLValueReferenceType(VariableType)
    << VD->getSourceRange();
2720}

2722/// DiagnoseForRangeVariableCopies - Diagnose three cases and fixes for them.
2723/// 1) for (const foo &x : foos) where foos only returns a copy.  Suggest
2724///    using "const foo x" to show that a copy is made
2725/// 2) for (const bar &x : foos) where bar is a temporary intialized by bar.
2726///    Suggest either "const bar x" to keep the copying or "const foo& x" to
2727///    prevent the copy.
2728/// 3) for (const foo x : foos) where x is constructed from a reference foo.
2729///    Suggest "const foo &x" to prevent the copy.
2730static void DiagnoseForRangeVariableCopies(Sema &SemaRef,
                                         const CXXForRangeStmt *ForStmt) {
if (SemaRef.Diags.isIgnored(diag::warn_for_range_const_reference_copy,
                            ForStmt->getLocStart()) &&
    SemaRef.Diags.isIgnored(diag::warn_for_range_variable_always_copy,
                            ForStmt->getLocStart()) &&
    SemaRef.Diags.isIgnored(diag::warn_for_range_copy,
                            ForStmt->getLocStart())) {
  return;
}

const VarDecl *VD = ForStmt->getLoopVariable();
if (!VD)
  return;

QualType VariableType = VD->getType();

if (VariableType->isIncompleteType())
  return;

const Expr *InitExpr = VD->getInit();
if (!InitExpr)
  return;

if (VariableType->isReferenceType()) {
  DiagnoseForRangeReferenceVariableCopies(SemaRef, VD,
                                          ForStmt->getRangeInit()->getType());
} else if (VariableType.isConstQualified()) {
  DiagnoseForRangeConstVariableCopies(SemaRef, VD);
}
2760}

2762/// FinishCXXForRangeStmt - Attach the body to a C++0x for-range statement.
2763/// This is a separate step from ActOnCXXForRangeStmt because analysis of the
2764/// body cannot be performed until after the type of the range variable is
2765/// determined.
2766StmtResult Sema::FinishCXXForRangeStmt(Stmt *S, Stmt *B) {
if (!S || !B)
  return StmtError();

if (isa<ObjCForCollectionStmt>(S))
  return FinishObjCForCollectionStmt(S, B);

CXXForRangeStmt *ForStmt = cast<CXXForRangeStmt>(S);
ForStmt->setBody(B);

DiagnoseEmptyStmtBody(ForStmt->getRParenLoc(), B,
                      diag::warn_empty_range_based_for_body);

DiagnoseForRangeVariableCopies(*this, ForStmt);

return S;
2782}

2784StmtResult Sema::ActOnGotoStmt(SourceLocation GotoLoc,
                             SourceLocation LabelLoc,
                             LabelDecl *TheDecl) {
getCurFunction()->setHasBranchIntoScope();
TheDecl->markUsed(Context);
return new (Context) GotoStmt(TheDecl, GotoLoc, LabelLoc);
2790}

2792StmtResult
2793Sema::ActOnIndirectGotoStmt(SourceLocation GotoLoc, SourceLocation StarLoc,
                          Expr *E) {
// Convert operand to void*
if (!E->isTypeDependent()) {
  QualType ETy = E->getType();
  QualType DestTy = Context.getPointerType(Context.VoidTy.withConst());
  ExprResult ExprRes = E;
  AssignConvertType ConvTy =
    CheckSingleAssignmentConstraints(DestTy, ExprRes);
  if (ExprRes.isInvalid())
    return StmtError();
  E = ExprRes.get();
  if (DiagnoseAssignmentResult(ConvTy, StarLoc, DestTy, ETy, E, AA_Passing))
    return StmtError();
}

ExprResult ExprRes = ActOnFinishFullExpr(E);
if (ExprRes.isInvalid())
  return StmtError();
E = ExprRes.get();

getCurFunction()->setHasIndirectGoto();

return new (Context) IndirectGotoStmt(GotoLoc, StarLoc, E);
2817}

2819static void CheckJumpOutOfSEHFinally(Sema &S, SourceLocation Loc,
                                   const Scope &DestScope) {
if (!S.CurrentSEHFinally.empty() &&
    DestScope.Contains(*S.CurrentSEHFinally.back())) {
  S.Diag(Loc, diag::warn_jump_out_of_seh_finally);
}
2825}

2827StmtResult
2828Sema::ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope) {
Scope *S = CurScope->getContinueParent();
if (!S) {
  // C99 6.8.6.2p1: A break shall appear only in or as a loop body.
  return StmtError(Diag(ContinueLoc, diag::err_continue_not_in_loop));
}
CheckJumpOutOfSEHFinally(*this, ContinueLoc, *S);

return new (Context) ContinueStmt(ContinueLoc);
2837}

2839StmtResult
2840Sema::ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope) {
Scope *S = CurScope->getBreakParent();
if (!S) {
  // C99 6.8.6.3p1: A break shall appear only in or as a switch/loop body.
  return StmtError(Diag(BreakLoc, diag::err_break_not_in_loop_or_switch));
}
if (S->isOpenMPLoopScope())
  return StmtError(Diag(BreakLoc, diag::err_omp_loop_cannot_use_stmt)
                   << "break");
CheckJumpOutOfSEHFinally(*this, BreakLoc, *S);

return new (Context) BreakStmt(BreakLoc);
2852}

2854/// \brief Determine whether the given expression is a candidate for
2855/// copy elision in either a return statement or a throw expression.
2856///
2857/// \param ReturnType If we're determining the copy elision candidate for
2858/// a return statement, this is the return type of the function. If we're
2859/// determining the copy elision candidate for a throw expression, this will
2860/// be a NULL type.
2861///
2862/// \param E The expression being returned from the function or block, or
2863/// being thrown.
2864///
2865/// \param AllowParamOrMoveConstructible Whether we allow function parameters or
2866/// id-expressions that could be moved out of the function to be considered NRVO
2867/// candidates. C++ prohibits these for NRVO itself, but we re-use this logic to
2868/// determine whether we should try to move as part of a return or throw (which
2869/// does allow function parameters).
2870///
2871/// \returns The NRVO candidate variable, if the return statement may use the
2872/// NRVO, or NULL if there is no such candidate.
2873VarDecl *Sema::getCopyElisionCandidate(QualType ReturnType, Expr *E,
                                     bool AllowParamOrMoveConstructible) {
if (!getLangOpts().CPlusPlus)
  return nullptr;

// - in a return statement in a function [where] ...
// ... the expression is the name of a non-volatile automatic object ...
DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E->IgnoreParens());
if (!DR || DR->refersToEnclosingVariableOrCapture())
  return nullptr;
VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl());
if (!VD)
  return nullptr;

if (isCopyElisionCandidate(ReturnType, VD, AllowParamOrMoveConstructible))
  return VD;
return nullptr;
2890}

2892bool Sema::isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
                                bool AllowParamOrMoveConstructible) {
QualType VDType = VD->getType();
// - in a return statement in a function with ...
// ... a class return type ...
if (!ReturnType.isNull() && !ReturnType->isDependentType()) {
  if (!ReturnType->isRecordType())
    return false;
  // ... the same cv-unqualified type as the function return type ...
  // When considering moving this expression out, allow dissimilar types.
  if (!AllowParamOrMoveConstructible && !VDType->isDependentType() &&
      !Context.hasSameUnqualifiedType(ReturnType, VDType))
    return false;
}

// ...object (other than a function or catch-clause parameter)...
if (VD->getKind() != Decl::Var &&
    !(AllowParamOrMoveConstructible && VD->getKind() == Decl::ParmVar))
  return false;
if (VD->isExceptionVariable()) return false;

// ...automatic...
if (!VD->hasLocalStorage()) return false;

// Return false if VD is a __block variable. We don't want to implicitly move
// out of a __block variable during a return because we cannot assume the
// variable will no longer be used.
if (VD->hasAttr<BlocksAttr>()) return false;

if (AllowParamOrMoveConstructible)
  return true;

// ...non-volatile...
if (VD->getType().isVolatileQualified()) return false;

// Variables with higher required alignment than their type's ABI
// alignment cannot use NRVO.
if (!VD->getType()->isDependentType() && VD->hasAttr<AlignedAttr>() &&
    Context.getDeclAlign(VD) > Context.getTypeAlignInChars(VD->getType()))
  return false;

return true;
2934}

2936/// \brief Perform the initialization of a potentially-movable value, which
2937/// is the result of return value.
2938///
2939/// This routine implements C++14 [class.copy]p32, which attempts to treat
2940/// returned lvalues as rvalues in certain cases (to prefer move construction),
2941/// then falls back to treating them as lvalues if that failed.
2942ExprResult
2943Sema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
                                    const VarDecl *NRVOCandidate,
                                    QualType ResultType,
                                    Expr *Value,
                                    bool AllowNRVO) {
// C++14 [class.copy]p32:
// When the criteria for elision of a copy/move operation are met, but not for
// an exception-declaration, and the object to be copied is designated by an
// lvalue, or when the expression in a return statement is a (possibly
// parenthesized) id-expression that names an object with automatic storage
// duration declared in the body or parameter-declaration-clause of the
// innermost enclosing function or lambda-expression, overload resolution to
// select the constructor for the copy is first performed as if the object
// were designated by an rvalue.
ExprResult Res = ExprError();

if (AllowNRVO && !NRVOCandidate)
  NRVOCandidate = getCopyElisionCandidate(ResultType, Value, true);

if (AllowNRVO && NRVOCandidate) {
  ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, Value->getType(),
                            CK_NoOp, Value, VK_XValue);

  Expr *InitExpr = &AsRvalue;

  InitializationKind Kind = InitializationKind::CreateCopy(
      Value->getLocStart(), Value->getLocStart());

  InitializationSequence Seq(*this, Entity, Kind, InitExpr);
  if (Seq) {
    for (const InitializationSequence::Step &Step : Seq.steps()) {
      if (!(Step.Kind ==
                InitializationSequence::SK_ConstructorInitialization ||
            (Step.Kind == InitializationSequence::SK_UserConversion &&
             isa<CXXConstructorDecl>(Step.Function.Function))))
        continue;

      CXXConstructorDecl *Constructor =
          cast<CXXConstructorDecl>(Step.Function.Function);

      const RValueReferenceType *RRefType
        = Constructor->getParamDecl(0)->getType()
                                               ->getAs<RValueReferenceType>();

      // [...] If the first overload resolution fails or was not performed, or
      // if the type of the first parameter of the selected constructor is not
      // an rvalue reference to the object's type (possibly cv-qualified),
      // overload resolution is performed again, considering the object as an
      // lvalue.
      if (!RRefType ||
          !Context.hasSameUnqualifiedType(RRefType->getPointeeType(),
                                          NRVOCandidate->getType()))
        break;

      // Promote "AsRvalue" to the heap, since we now need this
      // expression node to persist.
      Value = ImplicitCastExpr::Create(Context, Value->getType(), CK_NoOp,
                                       Value, nullptr, VK_XValue);

      // Complete type-checking the initialization of the return type
      // using the constructor we found.
      Res = Seq.Perform(*this, Entity, Kind, Value);
    }
  }
}

// Either we didn't meet the criteria for treating an lvalue as an rvalue,
// above, or overload resolution failed. Either way, we need to try
// (again) now with the return value expression as written.
if (Res.isInvalid())
  Res = PerformCopyInitialization(Entity, SourceLocation(), Value);

return Res;
3016}

3018/// \brief Determine whether the declared return type of the specified function
3019/// contains 'auto'.
3020static bool hasDeducedReturnType(FunctionDecl *FD) {
const FunctionProtoType *FPT =
    FD->getTypeSourceInfo()->getType()->castAs<FunctionProtoType>();
return FPT->getReturnType()->isUndeducedType();
3024}

3026/// ActOnCapScopeReturnStmt - Utility routine to type-check return statements
3027/// for capturing scopes.
3028///
3029StmtResult
3030Sema::ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) {
// If this is the first return we've seen, infer the return type.
// [expr.prim.lambda]p4 in C++11; block literals follow the same rules.
CapturingScopeInfo *CurCap = cast<CapturingScopeInfo>(getCurFunction());
QualType FnRetType = CurCap->ReturnType;
LambdaScopeInfo *CurLambda = dyn_cast<LambdaScopeInfo>(CurCap);
bool HasDeducedReturnType =
    CurLambda && hasDeducedReturnType(CurLambda->CallOperator);

if (ExprEvalContexts.back().Context ==
        ExpressionEvaluationContext::DiscardedStatement &&
    (HasDeducedReturnType || CurCap->HasImplicitReturnType)) {
  if (RetValExp) {
    ExprResult ER = ActOnFinishFullExpr(RetValExp, ReturnLoc);
    if (ER.isInvalid())
      return StmtError();
    RetValExp = ER.get();
  }
  return new (Context) ReturnStmt(ReturnLoc, RetValExp, nullptr);
}

if (HasDeducedReturnType) {
  // In C++1y, the return type may involve 'auto'.
  // FIXME: Blocks might have a return type of 'auto' explicitly specified.
  FunctionDecl *FD = CurLambda->CallOperator;
  if (CurCap->ReturnType.isNull())
    CurCap->ReturnType = FD->getReturnType();

  AutoType *AT = CurCap->ReturnType->getContainedAutoType();
  assert(AT && "lost auto type from lambda return type")(static_cast <bool> (AT && "lost auto type from lambda return type"
) ? void (0) : __assert_fail ("AT && \"lost auto type from lambda return type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3059, __extension__ __PRETTY_FUNCTION__));
  if (DeduceFunctionTypeFromReturnExpr(FD, ReturnLoc, RetValExp, AT)) {
    FD->setInvalidDecl();
    return StmtError();
  }
  CurCap->ReturnType = FnRetType = FD->getReturnType();
} else if (CurCap->HasImplicitReturnType) {
  // For blocks/lambdas with implicit return types, we check each return
  // statement individually, and deduce the common return type when the block
  // or lambda is completed.
  // FIXME: Fold this into the 'auto' codepath above.
  if (RetValExp && !isa<InitListExpr>(RetValExp)) {
    ExprResult Result = DefaultFunctionArrayLvalueConversion(RetValExp);
    if (Result.isInvalid())
      return StmtError();
    RetValExp = Result.get();

    // DR1048: even prior to C++14, we should use the 'auto' deduction rules
    // when deducing a return type for a lambda-expression (or by extension
    // for a block). These rules differ from the stated C++11 rules only in
    // that they remove top-level cv-qualifiers.
    if (!CurContext->isDependentContext())
      FnRetType = RetValExp->getType().getUnqualifiedType();
    else
      FnRetType = CurCap->ReturnType = Context.DependentTy;
  } else {
    if (RetValExp) {
      // C++11 [expr.lambda.prim]p4 bans inferring the result from an
      // initializer list, because it is not an expression (even
      // though we represent it as one). We still deduce 'void'.
      Diag(ReturnLoc, diag::err_lambda_return_init_list)
        << RetValExp->getSourceRange();
    }

    FnRetType = Context.VoidTy;
  }

  // Although we'll properly infer the type of the block once it's completed,
  // make sure we provide a return type now for better error recovery.
  if (CurCap->ReturnType.isNull())
    CurCap->ReturnType = FnRetType;
}
assert(!FnRetType.isNull())(static_cast <bool> (!FnRetType.isNull()) ? void (0) : __assert_fail
 ("!FnRetType.isNull()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3101, __extension__ __PRETTY_FUNCTION__));

if (BlockScopeInfo *CurBlock = dyn_cast<BlockScopeInfo>(CurCap)) {
  if (CurBlock->FunctionType->getAs<FunctionType>()->getNoReturnAttr()) {
    Diag(ReturnLoc, diag::err_noreturn_block_has_return_expr);
    return StmtError();
  }
} else if (CapturedRegionScopeInfo *CurRegion =
               dyn_cast<CapturedRegionScopeInfo>(CurCap)) {
  Diag(ReturnLoc, diag::err_return_in_captured_stmt) << CurRegion->getRegionName();
  return StmtError();
} else {
  assert(CurLambda && "unknown kind of captured scope")(static_cast <bool> (CurLambda && "unknown kind of captured scope"
) ? void (0) : __assert_fail ("CurLambda && \"unknown kind of captured scope\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3113, __extension__ __PRETTY_FUNCTION__));
  if (CurLambda->CallOperator->getType()->getAs<FunctionType>()
          ->getNoReturnAttr()) {
    Diag(ReturnLoc, diag::err_noreturn_lambda_has_return_expr);
    return StmtError();
  }
}

// Otherwise, verify that this result type matches the previous one.  We are
// pickier with blocks than for normal functions because we don't have GCC
// compatibility to worry about here.
const VarDecl *NRVOCandidate = nullptr;
if (FnRetType->isDependentType()) {
  // Delay processing for now.  TODO: there are lots of dependent
  // types we can conclusively prove aren't void.
} else if (FnRetType->isVoidType()) {
  if (RetValExp && !isa<InitListExpr>(RetValExp) &&
      !(getLangOpts().CPlusPlus &&
        (RetValExp->isTypeDependent() ||
         RetValExp->getType()->isVoidType()))) {
    if (!getLangOpts().CPlusPlus &&
        RetValExp->getType()->isVoidType())
      Diag(ReturnLoc, diag::ext_return_has_void_expr) << "literal" << 2;
    else {
      Diag(ReturnLoc, diag::err_return_block_has_expr);
      RetValExp = nullptr;
    }
  }
} else if (!RetValExp) {
  return StmtError(Diag(ReturnLoc, diag::err_block_return_missing_expr));
} else if (!RetValExp->isTypeDependent()) {
  // we have a non-void block with an expression, continue checking

  // C99 6.8.6.4p3(136): The return statement is not an assignment. The
  // overlap restriction of subclause 6.5.16.1 does not apply to the case of
  // function return.

  // In C++ the return statement is handled via a copy initialization.
  // the C version of which boils down to CheckSingleAssignmentConstraints.
  NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false);
  InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc,
                                                                 FnRetType,
                                                    NRVOCandidate != nullptr);
  ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate,
                                                   FnRetType, RetValExp);
  if (Res.isInvalid()) {
    // FIXME: Cleanup temporaries here, anyway?
    return StmtError();
  }
  RetValExp = Res.get();
  CheckReturnValExpr(RetValExp, FnRetType, ReturnLoc);
} else {
  NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false);
}

if (RetValExp) {
  ExprResult ER = ActOnFinishFullExpr(RetValExp, ReturnLoc);
  if (ER.isInvalid())
    return StmtError();
  RetValExp = ER.get();
}
ReturnStmt *Result = new (Context) ReturnStmt(ReturnLoc, RetValExp,
                                              NRVOCandidate);

// If we need to check for the named return value optimization,
// or if we need to infer the return type,
// save the return statement in our scope for later processing.
if (CurCap->HasImplicitReturnType || NRVOCandidate)
  FunctionScopes.back()->Returns.push_back(Result);

if (FunctionScopes.back()->FirstReturnLoc.isInvalid())
  FunctionScopes.back()->FirstReturnLoc = ReturnLoc;

return Result;
3187}

3189namespace {
3190/// \brief Marks all typedefs in all local classes in a type referenced.
3191///
3192/// In a function like
3193/// auto f() {
3194///   struct S { typedef int a; };
3195///   return S();
3196/// }
3197///
3198/// the local type escapes and could be referenced in some TUs but not in
3199/// others. Pretend that all local typedefs are always referenced, to not warn
3200/// on this. This isn't necessary if f has internal linkage, or the typedef
3201/// is private.
3202class LocalTypedefNameReferencer
  : public RecursiveASTVisitor<LocalTypedefNameReferencer> {
3204public:
LocalTypedefNameReferencer(Sema &S) : S(S) {}
bool VisitRecordType(const RecordType *RT);
3207private:
Sema &S;
3209};
3210bool LocalTypedefNameReferencer::VisitRecordType(const RecordType *RT) {
auto *R = dyn_cast<CXXRecordDecl>(RT->getDecl());
if (!R || !R->isLocalClass() || !R->isLocalClass()->isExternallyVisible() ||
    R->isDependentType())
  return true;
for (auto *TmpD : R->decls())
  if (auto *T = dyn_cast<TypedefNameDecl>(TmpD))
    if (T->getAccess() != AS_private || R->hasFriends())
      S.MarkAnyDeclReferenced(T->getLocation(), T, /*OdrUse=*/false);
return true;
3220}
3221}

3223TypeLoc Sema::getReturnTypeLoc(FunctionDecl *FD) const {
TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc().IgnoreParens();
while (auto ATL = TL.getAs<AttributedTypeLoc>())
  TL = ATL.getModifiedLoc().IgnoreParens();
return TL.castAs<FunctionProtoTypeLoc>().getReturnLoc();
3228}

3230/// Deduce the return type for a function from a returned expression, per
3231/// C++1y [dcl.spec.auto]p6.
3232bool Sema::DeduceFunctionTypeFromReturnExpr(FunctionDecl *FD,
                                          SourceLocation ReturnLoc,
                                          Expr *&RetExpr,
                                          AutoType *AT) {
// If this is the conversion function for a lambda, we choose to deduce it
// type from the corresponding call operator, not from the synthesized return
// statement within it. See Sema::DeduceReturnType.
if (isLambdaConversionOperator(FD))
  return false;

TypeLoc OrigResultType = getReturnTypeLoc(FD);
QualType Deduced;

if (RetExpr && isa<InitListExpr>(RetExpr)) {
  //  If the deduction is for a return statement and the initializer is
  //  a braced-init-list, the program is ill-formed.
  Diag(RetExpr->getExprLoc(),
       getCurLambda() ? diag::err_lambda_return_init_list
                      : diag::err_auto_fn_return_init_list)
      << RetExpr->getSourceRange();
  return true;
}

if (FD->isDependentContext()) {
  // C++1y [dcl.spec.auto]p12:
  //   Return type deduction [...] occurs when the definition is
  //   instantiated even if the function body contains a return
  //   statement with a non-type-dependent operand.
  assert(AT->isDeduced() && "should have deduced to dependent type")(static_cast <bool> (AT->isDeduced() && "should have deduced to dependent type"
) ? void (0) : __assert_fail ("AT->isDeduced() && \"should have deduced to dependent type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3260, __extension__ __PRETTY_FUNCTION__));
  return false;
} 

if (RetExpr) {
  //  Otherwise, [...] deduce a value for U using the rules of template
  //  argument deduction.
  DeduceAutoResult DAR = DeduceAutoType(OrigResultType, RetExpr, Deduced);

  if (DAR == DAR_Failed && !FD->isInvalidDecl())
    Diag(RetExpr->getExprLoc(), diag::err_auto_fn_deduction_failure)
      << OrigResultType.getType() << RetExpr->getType();

  if (DAR != DAR_Succeeded)
    return true;

  // If a local type is part of the returned type, mark its fields as
  // referenced.
  LocalTypedefNameReferencer Referencer(*this);
  Referencer.TraverseType(RetExpr->getType());
} else {
  //  In the case of a return with no operand, the initializer is considered
  //  to be void().
  //
  // Deduction here can only succeed if the return type is exactly 'cv auto'
  // or 'decltype(auto)', so just check for that case directly.
  if (!OrigResultType.getType()->getAs<AutoType>()) {
    Diag(ReturnLoc, diag::err_auto_fn_return_void_but_not_auto)
      << OrigResultType.getType();
    return true;
  }
  // We always deduce U = void in this case.
  Deduced = SubstAutoType(OrigResultType.getType(), Context.VoidTy);
  if (Deduced.isNull())
    return true;
}

//  If a function with a declared return type that contains a placeholder type
//  has multiple return statements, the return type is deduced for each return
//  statement. [...] if the type deduced is not the same in each deduction,
//  the program is ill-formed.
QualType DeducedT = AT->getDeducedType();
if (!DeducedT.isNull() && !FD->isInvalidDecl()) {
  AutoType *NewAT = Deduced->getContainedAutoType();
  // It is possible that NewAT->getDeducedType() is null. When that happens,
  // we should not crash, instead we ignore this deduction.
  if (NewAT->getDeducedType().isNull())
    return false;

  CanQualType OldDeducedType = Context.getCanonicalFunctionResultType(
                                 DeducedT);
  CanQualType NewDeducedType = Context.getCanonicalFunctionResultType(
                                 NewAT->getDeducedType());
  if (!FD->isDependentContext() && OldDeducedType != NewDeducedType) {
    const LambdaScopeInfo *LambdaSI = getCurLambda();
    if (LambdaSI && LambdaSI->HasImplicitReturnType) {
      Diag(ReturnLoc, diag::err_typecheck_missing_return_type_incompatible)
        << NewAT->getDeducedType() << DeducedT
        << true /*IsLambda*/;
    } else {
      Diag(ReturnLoc, diag::err_auto_fn_different_deductions)
        << (AT->isDecltypeAuto() ? 1 : 0)
        << NewAT->getDeducedType() << DeducedT;
    }
    return true;
  }
} else if (!FD->isInvalidDecl()) {
  // Update all declarations of the function to have the deduced return type.
  Context.adjustDeducedFunctionResultType(FD, Deduced);
}

return false;
3332}

3334StmtResult
3335Sema::ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
                    Scope *CurScope) {
StmtResult R = BuildReturnStmt(ReturnLoc, RetValExp);
if (R.isInvalid() || ExprEvalContexts.back().Context ==
                         ExpressionEvaluationContext::DiscardedStatement)
  return R;

if (VarDecl *VD =
    const_cast<VarDecl*>(cast<ReturnStmt>(R.get())->getNRVOCandidate())) {
  CurScope->addNRVOCandidate(VD);
} else {
  CurScope->setNoNRVO();
}

CheckJumpOutOfSEHFinally(*this, ReturnLoc, *CurScope->getFnParent());

return R;
3352}

3354StmtResult Sema::BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) {
// Check for unexpanded parameter packs.
if (RetValExp && DiagnoseUnexpandedParameterPack(RetValExp))
  return StmtError();

if (isa<CapturingScopeInfo>(getCurFunction()))
  return ActOnCapScopeReturnStmt(ReturnLoc, RetValExp);

QualType FnRetType;
QualType RelatedRetType;
const AttrVec *Attrs = nullptr;
bool isObjCMethod = false;

if (const FunctionDecl *FD = getCurFunctionDecl()) {
  FnRetType = FD->getReturnType();
  if (FD->hasAttrs())
    Attrs = &FD->getAttrs();
  if (FD->isNoReturn())
    Diag(ReturnLoc, diag::warn_noreturn_function_has_return_expr)
      << FD->getDeclName();
  if (FD->isMain() && RetValExp)
    if (isa<CXXBoolLiteralExpr>(RetValExp))
      Diag(ReturnLoc, diag::warn_main_returns_bool_literal)
        << RetValExp->getSourceRange();
} else if (ObjCMethodDecl *MD = getCurMethodDecl()) {
  FnRetType = MD->getReturnType();
  isObjCMethod = true;
  if (MD->hasAttrs())
    Attrs = &MD->getAttrs();
  if (MD->hasRelatedResultType() && MD->getClassInterface()) {
    // In the implementation of a method with a related return type, the
    // type used to type-check the validity of return statements within the
    // method body is a pointer to the type of the class being implemented.
    RelatedRetType = Context.getObjCInterfaceType(MD->getClassInterface());
    RelatedRetType = Context.getObjCObjectPointerType(RelatedRetType);
  }
} else // If we don't have a function/method context, bail.
  return StmtError();

// C++1z: discarded return statements are not considered when deducing a
// return type.
if (ExprEvalContexts.back().Context ==
        ExpressionEvaluationContext::DiscardedStatement &&
    FnRetType->getContainedAutoType()) {
  if (RetValExp) {
    ExprResult ER = ActOnFinishFullExpr(RetValExp, ReturnLoc);
    if (ER.isInvalid())
      return StmtError();
    RetValExp = ER.get();
  }
  return new (Context) ReturnStmt(ReturnLoc, RetValExp, nullptr);
}

// FIXME: Add a flag to the ScopeInfo to indicate whether we're performing
// deduction.
if (getLangOpts().CPlusPlus14) {
  if (AutoType *AT = FnRetType->getContainedAutoType()) {
    FunctionDecl *FD = cast<FunctionDecl>(CurContext);
    if (DeduceFunctionTypeFromReturnExpr(FD, ReturnLoc, RetValExp, AT)) {
      FD->setInvalidDecl();
      return StmtError();
    } else {
      FnRetType = FD->getReturnType();
    }
  }
}

bool HasDependentReturnType = FnRetType->isDependentType();

ReturnStmt *Result = nullptr;
if (FnRetType->isVoidType()) {
  if (RetValExp) {
    if (isa<InitListExpr>(RetValExp)) {
      // We simply never allow init lists as the return value of void
      // functions. This is compatible because this was never allowed before,
      // so there's no legacy code to deal with.
      NamedDecl *CurDecl = getCurFunctionOrMethodDecl();
      int FunctionKind = 0;
      if (isa<ObjCMethodDecl>(CurDecl))
        FunctionKind = 1;
      else if (isa<CXXConstructorDecl>(CurDecl))
        FunctionKind = 2;
      else if (isa<CXXDestructorDecl>(CurDecl))
        FunctionKind = 3;

      Diag(ReturnLoc, diag::err_return_init_list)
        << CurDecl->getDeclName() << FunctionKind
        << RetValExp->getSourceRange();

      // Drop the expression.
      RetValExp = nullptr;
    } else if (!RetValExp->isTypeDependent()) {
      // C99 6.8.6.4p1 (ext_ since GCC warns)
      unsigned D = diag::ext_return_has_expr;
      if (RetValExp->getType()->isVoidType()) {
        NamedDecl *CurDecl = getCurFunctionOrMethodDecl();
        if (isa<CXXConstructorDecl>(CurDecl) ||
            isa<CXXDestructorDecl>(CurDecl))
          D = diag::err_ctor_dtor_returns_void;
        else
          D = diag::ext_return_has_void_expr;
      }
      else {
        ExprResult Result = RetValExp;
        Result = IgnoredValueConversions(Result.get());
        if (Result.isInvalid())
          return StmtError();
        RetValExp = Result.get();
        RetValExp = ImpCastExprToType(RetValExp,
                                      Context.VoidTy, CK_ToVoid).get();
      }
      // return of void in constructor/destructor is illegal in C++.
      if (D == diag::err_ctor_dtor_returns_void) {
        NamedDecl *CurDecl = getCurFunctionOrMethodDecl();
        Diag(ReturnLoc, D)
          << CurDecl->getDeclName() << isa<CXXDestructorDecl>(CurDecl)
          << RetValExp->getSourceRange();
      }
      // return (some void expression); is legal in C++.
      else if (D != diag::ext_return_has_void_expr ||
               !getLangOpts().CPlusPlus) {
        NamedDecl *CurDecl = getCurFunctionOrMethodDecl();

        int FunctionKind = 0;
        if (isa<ObjCMethodDecl>(CurDecl))
          FunctionKind = 1;
        else if (isa<CXXConstructorDecl>(CurDecl))
          FunctionKind = 2;
        else if (isa<CXXDestructorDecl>(CurDecl))
          FunctionKind = 3;

        Diag(ReturnLoc, D)
          << CurDecl->getDeclName() << FunctionKind
          << RetValExp->getSourceRange();
      }
    }

    if (RetValExp) {
      ExprResult ER = ActOnFinishFullExpr(RetValExp, ReturnLoc);
      if (ER.isInvalid())
        return StmtError();
      RetValExp = ER.get();
    }
  }

  Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, nullptr);
} else if (!RetValExp && !HasDependentReturnType) {
  FunctionDecl *FD = getCurFunctionDecl();

  unsigned DiagID;
  if (getLangOpts().CPlusPlus11 && FD && FD->isConstexpr()) {
    // C++11 [stmt.return]p2
    DiagID = diag::err_constexpr_return_missing_expr;
    FD->setInvalidDecl();
  } else if (getLangOpts().C99) {
    // C99 6.8.6.4p1 (ext_ since GCC warns)
    DiagID = diag::ext_return_missing_expr;
  } else {
    // C90 6.6.6.4p4
    DiagID = diag::warn_return_missing_expr;
  }

  if (FD)
    Diag(ReturnLoc, DiagID) << FD->getIdentifier() << 0/*fn*/;
  else
    Diag(ReturnLoc, DiagID) << getCurMethodDecl()->getDeclName() << 1/*meth*/;

  Result = new (Context) ReturnStmt(ReturnLoc);
} else {
  assert(RetValExp || HasDependentReturnType)(static_cast <bool> (RetValExp || HasDependentReturnType
) ? void (0) : __assert_fail ("RetValExp || HasDependentReturnType"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3523, __extension__ __PRETTY_FUNCTION__));
  const VarDecl *NRVOCandidate = nullptr;

  QualType RetType = RelatedRetType.isNull() ? FnRetType : RelatedRetType;

  // C99 6.8.6.4p3(136): The return statement is not an assignment. The
  // overlap restriction of subclause 6.5.16.1 does not apply to the case of
  // function return.

  // In C++ the return statement is handled via a copy initialization,
  // the C version of which boils down to CheckSingleAssignmentConstraints.
  if (RetValExp)
    NRVOCandidate = getCopyElisionCandidate(FnRetType, RetValExp, false);
  if (!HasDependentReturnType && !RetValExp->isTypeDependent()) {
    // we have a non-void function with an expression, continue checking
    InitializedEntity Entity = InitializedEntity::InitializeResult(ReturnLoc,
                                                                   RetType,
                                                    NRVOCandidate != nullptr);
    ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOCandidate,
                                                     RetType, RetValExp);
    if (Res.isInvalid()) {
      // FIXME: Clean up temporaries here anyway?
      return StmtError();
    }
    RetValExp = Res.getAs<Expr>();

    // If we have a related result type, we need to implicitly
    // convert back to the formal result type.  We can't pretend to
    // initialize the result again --- we might end double-retaining
    // --- so instead we initialize a notional temporary.
    if (!RelatedRetType.isNull()) {
      Entity = InitializedEntity::InitializeRelatedResult(getCurMethodDecl(),
                                                          FnRetType);
      Res = PerformCopyInitialization(Entity, ReturnLoc, RetValExp);
      if (Res.isInvalid()) {
        // FIXME: Clean up temporaries here anyway?
        return StmtError();
      }
      RetValExp = Res.getAs<Expr>();
    }

    CheckReturnValExpr(RetValExp, FnRetType, ReturnLoc, isObjCMethod, Attrs,
                       getCurFunctionDecl());
  }

  if (RetValExp) {
    ExprResult ER = ActOnFinishFullExpr(RetValExp, ReturnLoc);
    if (ER.isInvalid())
      return StmtError();
    RetValExp = ER.get();
  }
  Result = new (Context) ReturnStmt(ReturnLoc, RetValExp, NRVOCandidate);
}

// If we need to check for the named return value optimization, save the
// return statement in our scope for later processing.
if (Result->getNRVOCandidate())
  FunctionScopes.back()->Returns.push_back(Result);

if (FunctionScopes.back()->FirstReturnLoc.isInvalid())
  FunctionScopes.back()->FirstReturnLoc = ReturnLoc;

return Result;
3586}

3588StmtResult
3589Sema::ActOnObjCAtCatchStmt(SourceLocation AtLoc,
                         SourceLocation RParen, Decl *Parm,
                         Stmt *Body) {
VarDecl *Var = cast_or_null<VarDecl>(Parm);
if (Var && Var->isInvalidDecl())
  return StmtError();

return new (Context) ObjCAtCatchStmt(AtLoc, RParen, Var, Body);
3597}

3599StmtResult
3600Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body) {
return new (Context) ObjCAtFinallyStmt(AtLoc, Body);
3602}

3604StmtResult
3605Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
                       MultiStmtArg CatchStmts, Stmt *Finally) {
if (!getLangOpts().ObjCExceptions)
  Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@try";

getCurFunction()->setHasBranchProtectedScope();
unsigned NumCatchStmts = CatchStmts.size();
return ObjCAtTryStmt::Create(Context, AtLoc, Try, CatchStmts.data(),
                             NumCatchStmts, Finally);
3614}

3616StmtResult Sema::BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw) {
if (Throw) {
  ExprResult Result = DefaultLvalueConversion(Throw);
  if (Result.isInvalid())
    return StmtError();

  Result = ActOnFinishFullExpr(Result.get());
  if (Result.isInvalid())
    return StmtError();
  Throw = Result.get();

  QualType ThrowType = Throw->getType();
  // Make sure the expression type is an ObjC pointer or "void *".
  if (!ThrowType->isDependentType() &&
      !ThrowType->isObjCObjectPointerType()) {
    const PointerType *PT = ThrowType->getAs<PointerType>();
    if (!PT || !PT->getPointeeType()->isVoidType())
      return StmtError(Diag(AtLoc, diag::err_objc_throw_expects_object)
                       << Throw->getType() << Throw->getSourceRange());
  }
}

return new (Context) ObjCAtThrowStmt(AtLoc, Throw);
3639}

3641StmtResult
3642Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
                         Scope *CurScope) {
if (!getLangOpts().ObjCExceptions)
  Diag(AtLoc, diag::err_objc_exceptions_disabled) << "@throw";

if (!Throw) {
  // @throw without an expression designates a rethrow (which must occur
  // in the context of an @catch clause).
  Scope *AtCatchParent = CurScope;
  while (AtCatchParent && !AtCatchParent->isAtCatchScope())
    AtCatchParent = AtCatchParent->getParent();
  if (!AtCatchParent)
    return StmtError(Diag(AtLoc, diag::err_rethrow_used_outside_catch));
}
return BuildObjCAtThrowStmt(AtLoc, Throw);
3657}

3659ExprResult
3660Sema::ActOnObjCAtSynchronizedOperand(SourceLocation atLoc, Expr *operand) {
ExprResult result = DefaultLvalueConversion(operand);
if (result.isInvalid())
  return ExprError();
operand = result.get();

// Make sure the expression type is an ObjC pointer or "void *".
QualType type = operand->getType();
if (!type->isDependentType() &&
    !type->isObjCObjectPointerType()) {
  const PointerType *pointerType = type->getAs<PointerType>();
  if (!pointerType || !pointerType->getPointeeType()->isVoidType()) {
    if (getLangOpts().CPlusPlus) {
      if (RequireCompleteType(atLoc, type,
                              diag::err_incomplete_receiver_type))
        return Diag(atLoc, diag::err_objc_synchronized_expects_object)
                 << type << operand->getSourceRange();

      ExprResult result = PerformContextuallyConvertToObjCPointer(operand);
      if (result.isInvalid())
        return ExprError();
      if (!result.isUsable())
        return Diag(atLoc, diag::err_objc_synchronized_expects_object)
                 << type << operand->getSourceRange();

      operand = result.get();
    } else {
        return Diag(atLoc, diag::err_objc_synchronized_expects_object)
                 << type << operand->getSourceRange();
    }
  }
}

// The operand to @synchronized is a full-expression.
return ActOnFinishFullExpr(operand);
3695}

3697StmtResult
3698Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, Expr *SyncExpr,
                                Stmt *SyncBody) {
// We can't jump into or indirect-jump out of a @synchronized block.
getCurFunction()->setHasBranchProtectedScope();
return new (Context) ObjCAtSynchronizedStmt(AtLoc, SyncExpr, SyncBody);
3703}

3705/// ActOnCXXCatchBlock - Takes an exception declaration and a handler block
3706/// and creates a proper catch handler from them.
3707StmtResult
3708Sema::ActOnCXXCatchBlock(SourceLocation CatchLoc, Decl *ExDecl,
                       Stmt *HandlerBlock) {
// There's nothing to test that ActOnExceptionDecl didn't already test.
return new (Context)
    CXXCatchStmt(CatchLoc, cast_or_null<VarDecl>(ExDecl), HandlerBlock);
3713}

3715StmtResult
3716Sema::ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body) {
getCurFunction()->setHasBranchProtectedScope();
return new (Context) ObjCAutoreleasePoolStmt(AtLoc, Body);
3719}

3721namespace {
3722class CatchHandlerType {
QualType QT;
unsigned IsPointer : 1;

// This is a special constructor to be used only with DenseMapInfo's
// getEmptyKey() and getTombstoneKey() functions.
friend struct llvm::DenseMapInfo<CatchHandlerType>;
enum Unique { ForDenseMap };
CatchHandlerType(QualType QT, Unique) : QT(QT), IsPointer(false) {}

3732public:
/// Used when creating a CatchHandlerType from a handler type; will determine
/// whether the type is a pointer or reference and will strip off the top
/// level pointer and cv-qualifiers.
CatchHandlerType(QualType Q) : QT(Q), IsPointer(false) {
  if (QT->isPointerType())
    IsPointer = true;

  if (IsPointer || QT->isReferenceType())
    QT = QT->getPointeeType();
  QT = QT.getUnqualifiedType();
}

/// Used when creating a CatchHandlerType from a base class type; pretends the
/// type passed in had the pointer qualifier, does not need to get an
/// unqualified type.
CatchHandlerType(QualType QT, bool IsPointer)
    : QT(QT), IsPointer(IsPointer) {}

QualType underlying() const { return QT; }
bool isPointer() const { return IsPointer; }

friend bool operator==(const CatchHandlerType &LHS,
                       const CatchHandlerType &RHS) {
  // If the pointer qualification does not match, we can return early.
  if (LHS.IsPointer != RHS.IsPointer)
    return false;
  // Otherwise, check the underlying type without cv-qualifiers.
  return LHS.QT == RHS.QT;
}
3762};
3763} // namespace

3765namespace llvm {
3766template <> struct DenseMapInfo<CatchHandlerType> {
static CatchHandlerType getEmptyKey() {
  return CatchHandlerType(DenseMapInfo<QualType>::getEmptyKey(),
                     CatchHandlerType::ForDenseMap);
}

static CatchHandlerType getTombstoneKey() {
  return CatchHandlerType(DenseMapInfo<QualType>::getTombstoneKey(),
                     CatchHandlerType::ForDenseMap);
}

static unsigned getHashValue(const CatchHandlerType &Base) {
  return DenseMapInfo<QualType>::getHashValue(Base.underlying());
}

static bool isEqual(const CatchHandlerType &LHS,
                    const CatchHandlerType &RHS) {
  return LHS == RHS;
}
3785};
3786}

3788namespace {
3789class CatchTypePublicBases {
ASTContext &Ctx;
const llvm::DenseMap<CatchHandlerType, CXXCatchStmt *> &TypesToCheck;
const bool CheckAgainstPointer;

CXXCatchStmt *FoundHandler;
CanQualType FoundHandlerType;

3797public:
CatchTypePublicBases(
    ASTContext &Ctx,
    const llvm::DenseMap<CatchHandlerType, CXXCatchStmt *> &T, bool C)
    : Ctx(Ctx), TypesToCheck(T), CheckAgainstPointer(C),
      FoundHandler(nullptr) {}

CXXCatchStmt *getFoundHandler() const { return FoundHandler; }
CanQualType getFoundHandlerType() const { return FoundHandlerType; }

bool operator()(const CXXBaseSpecifier *S, CXXBasePath &) {
  if (S->getAccessSpecifier() == AccessSpecifier::AS_public) {
    CatchHandlerType Check(S->getType(), CheckAgainstPointer);
    const auto &M = TypesToCheck;
    auto I = M.find(Check);
    if (I != M.end()) {
      FoundHandler = I->second;
      FoundHandlerType = Ctx.getCanonicalType(S->getType());
      return true;
    }
  }
  return false;
}
3820};
3821}

3823/// ActOnCXXTryBlock - Takes a try compound-statement and a number of
3824/// handlers and creates a try statement from them.
3825StmtResult Sema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
                                ArrayRef<Stmt *> Handlers) {
// Don't report an error if 'try' is used in system headers.
if (!getLangOpts().CXXExceptions &&
1
Assuming the condition is false→
    !getSourceManager().isInSystemHeader(TryLoc))
  Diag(TryLoc, diag::err_exceptions_disabled) << "try";

// Exceptions aren't allowed in CUDA device code.
if (getLangOpts().CUDA)
2
←
Assuming the condition is true→
3
←
Taking true branch→
  CUDADiagIfDeviceCode(TryLoc, diag::err_cuda_device_exceptions)
4
←
Calling 'operator<<'→
21
←
Returned allocated memory→
      << "try" << CurrentCUDATarget();

if (getCurScope() && getCurScope()->isOpenMPSimdDirectiveScope())
22
←
Potential leak of memory pointed to by field 'DiagStorage'
  Diag(TryLoc, diag::err_omp_simd_region_cannot_use_stmt) << "try";

sema::FunctionScopeInfo *FSI = getCurFunction();

// C++ try is incompatible with SEH __try.
if (!getLangOpts().Borland && FSI->FirstSEHTryLoc.isValid()) {
  Diag(TryLoc, diag::err_mixing_cxx_try_seh_try);
  Diag(FSI->FirstSEHTryLoc, diag::note_conflicting_try_here) << "'__try'";
}

const unsigned NumHandlers = Handlers.size();
assert(!Handlers.empty() &&(static_cast <bool> (!Handlers.empty() && "The parser shouldn't call this if there are no handlers."
) ? void (0) : __assert_fail ("!Handlers.empty() && \"The parser shouldn't call this if there are no handlers.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3850, __extension__ __PRETTY_FUNCTION__))
       "The parser shouldn't call this if there are no handlers.")(static_cast <bool> (!Handlers.empty() && "The parser shouldn't call this if there are no handlers."
) ? void (0) : __assert_fail ("!Handlers.empty() && \"The parser shouldn't call this if there are no handlers.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3850, __extension__ __PRETTY_FUNCTION__));

llvm::DenseMap<CatchHandlerType, CXXCatchStmt *> HandledTypes;
for (unsigned i = 0; i < NumHandlers; ++i) {
  CXXCatchStmt *H = cast<CXXCatchStmt>(Handlers[i]);

  // Diagnose when the handler is a catch-all handler, but it isn't the last
  // handler for the try block. [except.handle]p5. Also, skip exception
  // declarations that are invalid, since we can't usefully report on them.
  if (!H->getExceptionDecl()) {
    if (i < NumHandlers - 1)
      return StmtError(Diag(H->getLocStart(), diag::err_early_catch_all));
    continue;
  } else if (H->getExceptionDecl()->isInvalidDecl())
    continue;

  // Walk the type hierarchy to diagnose when this type has already been
  // handled (duplication), or cannot be handled (derivation inversion). We
  // ignore top-level cv-qualifiers, per [except.handle]p3
  CatchHandlerType HandlerCHT =
      (QualType)Context.getCanonicalType(H->getCaughtType());

  // We can ignore whether the type is a reference or a pointer; we need the
  // underlying declaration type in order to get at the underlying record
  // decl, if there is one.
  QualType Underlying = HandlerCHT.underlying();
  if (auto *RD = Underlying->getAsCXXRecordDecl()) {
    if (!RD->hasDefinition())
      continue;
    // Check that none of the public, unambiguous base classes are in the
    // map ([except.handle]p1). Give the base classes the same pointer
    // qualification as the original type we are basing off of. This allows
    // comparison against the handler type using the same top-level pointer
    // as the original type.
    CXXBasePaths Paths;
    Paths.setOrigin(RD);
    CatchTypePublicBases CTPB(Context, HandledTypes, HandlerCHT.isPointer());
    if (RD->lookupInBases(CTPB, Paths)) {
      const CXXCatchStmt *Problem = CTPB.getFoundHandler();
      if (!Paths.isAmbiguous(CTPB.getFoundHandlerType())) {
        Diag(H->getExceptionDecl()->getTypeSpecStartLoc(),
             diag::warn_exception_caught_by_earlier_handler)
            << H->getCaughtType();
        Diag(Problem->getExceptionDecl()->getTypeSpecStartLoc(),
              diag::note_previous_exception_handler)
            << Problem->getCaughtType();
      }
    }
  }

  // Add the type the list of ones we have handled; diagnose if we've already
  // handled it.
  auto R = HandledTypes.insert(std::make_pair(H->getCaughtType(), H));
  if (!R.second) {
    const CXXCatchStmt *Problem = R.first->second;
    Diag(H->getExceptionDecl()->getTypeSpecStartLoc(),
         diag::warn_exception_caught_by_earlier_handler)
        << H->getCaughtType();
    Diag(Problem->getExceptionDecl()->getTypeSpecStartLoc(),
         diag::note_previous_exception_handler)
        << Problem->getCaughtType();
  }
}

FSI->setHasCXXTry(TryLoc);

return CXXTryStmt::Create(Context, TryLoc, TryBlock, Handlers);
3917}

3919StmtResult Sema::ActOnSEHTryBlock(bool IsCXXTry, SourceLocation TryLoc,
                                Stmt *TryBlock, Stmt *Handler) {
assert(TryBlock && Handler)(static_cast <bool> (TryBlock && Handler) ? void
 (0) : __assert_fail ("TryBlock && Handler", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3921, __extension__ __PRETTY_FUNCTION__));

sema::FunctionScopeInfo *FSI = getCurFunction();

// SEH __try is incompatible with C++ try. Borland appears to support this,
// however.
if (!getLangOpts().Borland) {
  if (FSI->FirstCXXTryLoc.isValid()) {
    Diag(TryLoc, diag::err_mixing_cxx_try_seh_try);
    Diag(FSI->FirstCXXTryLoc, diag::note_conflicting_try_here) << "'try'";
  }
}

FSI->setHasSEHTry(TryLoc);

// Reject __try in Obj-C methods, blocks, and captured decls, since we don't
// track if they use SEH.
DeclContext *DC = CurContext;
while (DC && !DC->isFunctionOrMethod())
  DC = DC->getParent();
FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(DC);
if (FD)
  FD->setUsesSEHTry(true);
else
  Diag(TryLoc, diag::err_seh_try_outside_functions);

// Reject __try on unsupported targets.
if (!Context.getTargetInfo().isSEHTrySupported())
  Diag(TryLoc, diag::err_seh_try_unsupported);

return SEHTryStmt::Create(Context, IsCXXTry, TryLoc, TryBlock, Handler);
3952}

3954StmtResult
3955Sema::ActOnSEHExceptBlock(SourceLocation Loc,
                        Expr *FilterExpr,
                        Stmt *Block) {
assert(FilterExpr && Block)(static_cast <bool> (FilterExpr && Block) ? void
 (0) : __assert_fail ("FilterExpr && Block", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3958, __extension__ __PRETTY_FUNCTION__));

if(!FilterExpr->getType()->isIntegerType()) {
  return StmtError(Diag(FilterExpr->getExprLoc(),
                   diag::err_filter_expression_integral)
                   << FilterExpr->getType());
}

return SEHExceptStmt::Create(Context,Loc,FilterExpr,Block);
3967}

3969void Sema::ActOnStartSEHFinallyBlock() {
CurrentSEHFinally.push_back(CurScope);
3971}

3973void Sema::ActOnAbortSEHFinallyBlock() {
CurrentSEHFinally.pop_back();
3975}

3977StmtResult Sema::ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block) {
assert(Block)(static_cast <bool> (Block) ? void (0) : __assert_fail (
"Block", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 3978, __extension__ __PRETTY_FUNCTION__));
CurrentSEHFinally.pop_back();
return SEHFinallyStmt::Create(Context, Loc, Block);
3981}

3983StmtResult
3984Sema::ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope) {
Scope *SEHTryParent = CurScope;
while (SEHTryParent && !SEHTryParent->isSEHTryScope())
  SEHTryParent = SEHTryParent->getParent();
if (!SEHTryParent)
  return StmtError(Diag(Loc, diag::err_ms___leave_not_in___try));
CheckJumpOutOfSEHFinally(*this, Loc, *SEHTryParent);

return new (Context) SEHLeaveStmt(Loc);
3993}

3995StmtResult Sema::BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
                                          bool IsIfExists,
                                          NestedNameSpecifierLoc QualifierLoc,
                                          DeclarationNameInfo NameInfo,
                                          Stmt *Nested)
4000{
return new (Context) MSDependentExistsStmt(KeywordLoc, IsIfExists,
                                           QualifierLoc, NameInfo,
                                           cast<CompoundStmt>(Nested));
4004}


4007StmtResult Sema::ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
                                          bool IsIfExists,
                                          CXXScopeSpec &SS,
                                          UnqualifiedId &Name,
                                          Stmt *Nested) {
return BuildMSDependentExistsStmt(KeywordLoc, IsIfExists,
                                  SS.getWithLocInContext(Context),
                                  GetNameFromUnqualifiedId(Name),
                                  Nested);
4016}

4018RecordDecl*
4019Sema::CreateCapturedStmtRecordDecl(CapturedDecl *&CD, SourceLocation Loc,
                                 unsigned NumParams) {
DeclContext *DC = CurContext;
while (!(DC->isFunctionOrMethod() || DC->isRecord() || DC->isFileContext()))
  DC = DC->getParent();

RecordDecl *RD = nullptr;
if (getLangOpts().CPlusPlus)
  RD = CXXRecordDecl::Create(Context, TTK_Struct, DC, Loc, Loc,
                             /*Id=*/nullptr);
else
  RD = RecordDecl::Create(Context, TTK_Struct, DC, Loc, Loc, /*Id=*/nullptr);

RD->setCapturedRecord();
DC->addDecl(RD);
RD->setImplicit();
RD->startDefinition();

assert(NumParams > 0 && "CapturedStmt requires context parameter")(static_cast <bool> (NumParams > 0 && "CapturedStmt requires context parameter"
) ? void (0) : __assert_fail ("NumParams > 0 && \"CapturedStmt requires context parameter\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 4037, __extension__ __PRETTY_FUNCTION__));
CD = CapturedDecl::Create(Context, CurContext, NumParams);
DC->addDecl(CD);
return RD;
4041}

4043static void buildCapturedStmtCaptureList(
  SmallVectorImpl<CapturedStmt::Capture> &Captures,
  SmallVectorImpl<Expr *> &CaptureInits,
  ArrayRef<CapturingScopeInfo::Capture> Candidates) {

typedef ArrayRef<CapturingScopeInfo::Capture>::const_iterator CaptureIter;
for (CaptureIter Cap = Candidates.begin(); Cap != Candidates.end(); ++Cap) {

  if (Cap->isThisCapture()) {
    Captures.push_back(CapturedStmt::Capture(Cap->getLocation(),
                                             CapturedStmt::VCK_This));
    CaptureInits.push_back(Cap->getInitExpr());
    continue;
  } else if (Cap->isVLATypeCapture()) {
    Captures.push_back(
        CapturedStmt::Capture(Cap->getLocation(), CapturedStmt::VCK_VLAType));
    CaptureInits.push_back(nullptr);
    continue;
  }

  Captures.push_back(CapturedStmt::Capture(Cap->getLocation(),
                                           Cap->isReferenceCapture()
                                               ? CapturedStmt::VCK_ByRef
                                               : CapturedStmt::VCK_ByCopy,
                                           Cap->getVariable()));
  CaptureInits.push_back(Cap->getInitExpr());
}
4070}

4072void Sema::ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                                  CapturedRegionKind Kind,
                                  unsigned NumParams) {
CapturedDecl *CD = nullptr;
RecordDecl *RD = CreateCapturedStmtRecordDecl(CD, Loc, NumParams);

// Build the context parameter
DeclContext *DC = CapturedDecl::castToDeclContext(CD);
IdentifierInfo *ParamName = &Context.Idents.get("__context");
QualType ParamType = Context.getPointerType(Context.getTagDeclType(RD));
auto *Param =
    ImplicitParamDecl::Create(Context, DC, Loc, ParamName, ParamType,
                              ImplicitParamDecl::CapturedContext);
DC->addDecl(Param);

CD->setContextParam(0, Param);

// Enter the capturing scope for this captured region.
PushCapturedRegionScope(CurScope, CD, RD, Kind);

if (CurScope)
  PushDeclContext(CurScope, CD);
else
  CurContext = CD;

PushExpressionEvaluationContext(
    ExpressionEvaluationContext::PotentiallyEvaluated);
4099}

4101void Sema::ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                                  CapturedRegionKind Kind,
                                  ArrayRef<CapturedParamNameType> Params) {
CapturedDecl *CD = nullptr;
RecordDecl *RD = CreateCapturedStmtRecordDecl(CD, Loc, Params.size());

// Build the context parameter
DeclContext *DC = CapturedDecl::castToDeclContext(CD);
bool ContextIsFound = false;
unsigned ParamNum = 0;
for (ArrayRef<CapturedParamNameType>::iterator I = Params.begin(),
                                               E = Params.end();
     I != E; ++I, ++ParamNum) {
  if (I->second.isNull()) {
    assert(!ContextIsFound &&(static_cast <bool> (!ContextIsFound && "null type has been found already for '__context' parameter"
) ? void (0) : __assert_fail ("!ContextIsFound && \"null type has been found already for '__context' parameter\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 4116, __extension__ __PRETTY_FUNCTION__))
           "null type has been found already for '__context' parameter")(static_cast <bool> (!ContextIsFound && "null type has been found already for '__context' parameter"
) ? void (0) : __assert_fail ("!ContextIsFound && \"null type has been found already for '__context' parameter\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 4116, __extension__ __PRETTY_FUNCTION__));
    IdentifierInfo *ParamName = &Context.Idents.get("__context");
    QualType ParamType = Context.getPointerType(Context.getTagDeclType(RD));
    auto *Param =
        ImplicitParamDecl::Create(Context, DC, Loc, ParamName, ParamType,
                                  ImplicitParamDecl::CapturedContext);
    DC->addDecl(Param);
    CD->setContextParam(ParamNum, Param);
    ContextIsFound = true;
  } else {
    IdentifierInfo *ParamName = &Context.Idents.get(I->first);
    auto *Param =
        ImplicitParamDecl::Create(Context, DC, Loc, ParamName, I->second,
                                  ImplicitParamDecl::CapturedContext);
    DC->addDecl(Param);
    CD->setParam(ParamNum, Param);
  }
}
assert(ContextIsFound && "no null type for '__context' parameter")(static_cast <bool> (ContextIsFound && "no null type for '__context' parameter"
) ? void (0) : __assert_fail ("ContextIsFound && \"no null type for '__context' parameter\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaStmt.cpp"
, 4134, __extension__ __PRETTY_FUNCTION__));
if (!ContextIsFound) {
  // Add __context implicitly if it is not specified.
  IdentifierInfo *ParamName = &Context.Idents.get("__context");
  QualType ParamType = Context.getPointerType(Context.getTagDeclType(RD));
  auto *Param =
      ImplicitParamDecl::Create(Context, DC, Loc, ParamName, ParamType,
                                ImplicitParamDecl::CapturedContext);
  DC->addDecl(Param);
  CD->setContextParam(ParamNum, Param);
}
// Enter the capturing scope for this captured region.
PushCapturedRegionScope(CurScope, CD, RD, Kind);

if (CurScope)
  PushDeclContext(CurScope, CD);
else
  CurContext = CD;

PushExpressionEvaluationContext(
    ExpressionEvaluationContext::PotentiallyEvaluated);
4155}

4157void Sema::ActOnCapturedRegionError() {
DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();

CapturedRegionScopeInfo *RSI = getCurCapturedRegion();
RecordDecl *Record = RSI->TheRecordDecl;
Record->setInvalidDecl();

SmallVector<Decl*, 4> Fields(Record->fields());
ActOnFields(/*Scope=*/nullptr, Record->getLocation(), Record, Fields,
            SourceLocation(), SourceLocation(), /*AttributeList=*/nullptr);

PopDeclContext();
PopFunctionScopeInfo();
4171}

4173StmtResult Sema::ActOnCapturedRegionEnd(Stmt *S) {
CapturedRegionScopeInfo *RSI = getCurCapturedRegion();

SmallVector<CapturedStmt::Capture, 4> Captures;
SmallVector<Expr *, 4> CaptureInits;
buildCapturedStmtCaptureList(Captures, CaptureInits, RSI->Captures);

CapturedDecl *CD = RSI->TheCapturedDecl;
RecordDecl *RD = RSI->TheRecordDecl;

CapturedStmt *Res = CapturedStmt::Create(
    getASTContext(), S, static_cast<CapturedRegionKind>(RSI->CapRegionKind),
    Captures, CaptureInits, CD, RD);

CD->setBody(Res->getCapturedStmt());
RD->completeDefinition();

DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();

PopDeclContext();
PopFunctionScopeInfo();

return Res;
4197}

←

/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h

→

1//===--- Sema.h - Semantic Analysis & AST Building --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the Sema class, which performs semantic analysis and
11// builds ASTs.
12//
13//===----------------------------------------------------------------------===//

15#ifndef LLVM_CLANG_SEMA_SEMA_H
16#define LLVM_CLANG_SEMA_SEMA_H

18#include "clang/AST/Attr.h"
19#include "clang/AST/Availability.h"
20#include "clang/AST/DeclarationName.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/Expr.h"
23#include "clang/AST/ExprObjC.h"
24#include "clang/AST/ExternalASTSource.h"
25#include "clang/AST/LocInfoType.h"
26#include "clang/AST/MangleNumberingContext.h"
27#include "clang/AST/NSAPI.h"
28#include "clang/AST/PrettyPrinter.h"
29#include "clang/AST/StmtCXX.h"
30#include "clang/AST/TypeLoc.h"
31#include "clang/AST/TypeOrdering.h"
32#include "clang/Basic/ExpressionTraits.h"
33#include "clang/Basic/LangOptions.h"
34#include "clang/Basic/Module.h"
35#include "clang/Basic/OpenMPKinds.h"
36#include "clang/Basic/PragmaKinds.h"
37#include "clang/Basic/Specifiers.h"
38#include "clang/Basic/TemplateKinds.h"
39#include "clang/Basic/TypeTraits.h"
40#include "clang/Sema/AnalysisBasedWarnings.h"
41#include "clang/Sema/CleanupInfo.h"
42#include "clang/Sema/DeclSpec.h"
43#include "clang/Sema/ExternalSemaSource.h"
44#include "clang/Sema/IdentifierResolver.h"
45#include "clang/Sema/ObjCMethodList.h"
46#include "clang/Sema/Ownership.h"
47#include "clang/Sema/Scope.h"
48#include "clang/Sema/ScopeInfo.h"
49#include "clang/Sema/TypoCorrection.h"
50#include "clang/Sema/Weak.h"
51#include "llvm/ADT/ArrayRef.h"
52#include "llvm/ADT/Optional.h"
53#include "llvm/ADT/SetVector.h"
54#include "llvm/ADT/SmallPtrSet.h"
55#include "llvm/ADT/SmallVector.h"
56#include "llvm/ADT/TinyPtrVector.h"
57#include <deque>
58#include <memory>
59#include <string>
60#include <vector>

62namespace llvm {
class APSInt;
template <typename ValueT> struct DenseMapInfo;
template <typename ValueT, typename ValueInfoT> class DenseSet;
class SmallBitVector;
struct InlineAsmIdentifierInfo;
68}

70namespace clang {
class ADLResult;
class ASTConsumer;
class ASTContext;
class ASTMutationListener;
class ASTReader;
class ASTWriter;
class ArrayType;
class AttributeList;
class BindingDecl;
class BlockDecl;
class CapturedDecl;
class CXXBasePath;
class CXXBasePaths;
class CXXBindTemporaryExpr;
typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
class CXXConstructorDecl;
class CXXConversionDecl;
class CXXDeleteExpr;
class CXXDestructorDecl;
class CXXFieldCollector;
class CXXMemberCallExpr;
class CXXMethodDecl;
class CXXScopeSpec;
class CXXTemporary;
class CXXTryStmt;
class CallExpr;
class ClassTemplateDecl;
class ClassTemplatePartialSpecializationDecl;
class ClassTemplateSpecializationDecl;
class VarTemplatePartialSpecializationDecl;
class CodeCompleteConsumer;
class CodeCompletionAllocator;
class CodeCompletionTUInfo;
class CodeCompletionResult;
class CoroutineBodyStmt;
class Decl;
class DeclAccessPair;
class DeclContext;
class DeclRefExpr;
class DeclaratorDecl;
class DeducedTemplateArgument;
class DependentDiagnostic;
class DesignatedInitExpr;
class Designation;
class EnableIfAttr;
class EnumConstantDecl;
class Expr;
class ExtVectorType;
class FormatAttr;
class FriendDecl;
class FunctionDecl;
class FunctionProtoType;
class FunctionTemplateDecl;
class ImplicitConversionSequence;
typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
class InitListExpr;
class InitializationKind;
class InitializationSequence;
class InitializedEntity;
class IntegerLiteral;
class LabelStmt;
class LambdaExpr;
class LangOptions;
class LocalInstantiationScope;
class LookupResult;
class MacroInfo;
typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
class ModuleLoader;
class MultiLevelTemplateArgumentList;
class NamedDecl;
class ObjCCategoryDecl;
class ObjCCategoryImplDecl;
class ObjCCompatibleAliasDecl;
class ObjCContainerDecl;
class ObjCImplDecl;
class ObjCImplementationDecl;
class ObjCInterfaceDecl;
class ObjCIvarDecl;
template <class T> class ObjCList;
class ObjCMessageExpr;
class ObjCMethodDecl;
class ObjCPropertyDecl;
class ObjCProtocolDecl;
class OMPThreadPrivateDecl;
class OMPDeclareReductionDecl;
class OMPDeclareSimdDecl;
class OMPClause;
struct OverloadCandidate;
class OverloadCandidateSet;
class OverloadExpr;
class ParenListExpr;
class ParmVarDecl;
class Preprocessor;
class PseudoDestructorTypeStorage;
class PseudoObjectExpr;
class QualType;
class StandardConversionSequence;
class Stmt;
class StringLiteral;
class SwitchStmt;
class TemplateArgument;
class TemplateArgumentList;
class TemplateArgumentLoc;
class TemplateDecl;
class TemplateInstantiationCallback;
class TemplateParameterList;
class TemplatePartialOrderingContext;
class TemplateTemplateParmDecl;
class Token;
class TypeAliasDecl;
class TypedefDecl;
class TypedefNameDecl;
class TypeLoc;
class TypoCorrectionConsumer;
class UnqualifiedId;
class UnresolvedLookupExpr;
class UnresolvedMemberExpr;
class UnresolvedSetImpl;
class UnresolvedSetIterator;
class UsingDecl;
class UsingShadowDecl;
class ValueDecl;
class VarDecl;
class VarTemplateSpecializationDecl;
class VisibilityAttr;
class VisibleDeclConsumer;
class IndirectFieldDecl;
struct DeductionFailureInfo;
class TemplateSpecCandidateSet;

201namespace sema {
class AccessedEntity;
class BlockScopeInfo;
class CapturedRegionScopeInfo;
class CapturingScopeInfo;
class CompoundScopeInfo;
class DelayedDiagnostic;
class DelayedDiagnosticPool;
class FunctionScopeInfo;
class LambdaScopeInfo;
class PossiblyUnreachableDiag;
class SemaPPCallbacks;
class TemplateDeductionInfo;
214}

216namespace threadSafety {
class BeforeSet;
void threadSafetyCleanup(BeforeSet* Cache);
219}

221// FIXME: No way to easily map from TemplateTypeParmTypes to
222// TemplateTypeParmDecls, so we have this horrible PointerUnion.
223typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
                SourceLocation> UnexpandedParameterPack;

226/// Describes whether we've seen any nullability information for the given
227/// file.
228struct FileNullability {
/// The first pointer declarator (of any pointer kind) in the file that does
/// not have a corresponding nullability annotation.
SourceLocation PointerLoc;

/// The end location for the first pointer declarator in the file. Used for
/// placing fix-its.
SourceLocation PointerEndLoc;

/// Which kind of pointer declarator we saw.
uint8_t PointerKind;

/// Whether we saw any type nullability annotations in the given file.
bool SawTypeNullability = false;
242};

244/// A mapping from file IDs to a record of whether we've seen nullability
245/// information in that file.
246class FileNullabilityMap {
/// A mapping from file IDs to the nullability information for each file ID.
llvm::DenseMap<FileID, FileNullability> Map;

/// A single-element cache based on the file ID.
struct {
  FileID File;
  FileNullability Nullability;
} Cache;

256public:
FileNullability &operator[](FileID file) {
  // Check the single-element cache.
  if (file == Cache.File)
    return Cache.Nullability;

  // It's not in the single-element cache; flush the cache if we have one.
  if (!Cache.File.isInvalid()) {
    Map[Cache.File] = Cache.Nullability;
  }

  // Pull this entry into the cache.
  Cache.File = file;
  Cache.Nullability = Map[file];
  return Cache.Nullability;
}
272};

274/// Sema - This implements semantic analysis and AST building for C.
275class Sema {
Sema(const Sema &) = delete;
void operator=(const Sema &) = delete;

///\brief Source of additional semantic information.
ExternalSemaSource *ExternalSource;

///\brief Whether Sema has generated a multiplexer and has to delete it.
bool isMultiplexExternalSource;

static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);

bool isVisibleSlow(const NamedDecl *D);

/// Determine whether two declarations should be linked together, given that
/// the old declaration might not be visible and the new declaration might
/// not have external linkage.
bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
                                  const NamedDecl *New) {
  if (isVisible(Old))
   return true;
  // See comment in below overload for why it's safe to compute the linkage
  // of the new declaration here.
  if (New->isExternallyDeclarable()) {
    assert(Old->isExternallyDeclarable() &&(static_cast <bool> (Old->isExternallyDeclarable() &&
 "should not have found a non-externally-declarable previous decl"
) ? void (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 300, __extension__ __PRETTY_FUNCTION__))
           "should not have found a non-externally-declarable previous decl")(static_cast <bool> (Old->isExternallyDeclarable() &&
 "should not have found a non-externally-declarable previous decl"
) ? void (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 300, __extension__ __PRETTY_FUNCTION__));
    return true;
  }
  return false;
}
bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);

307public:
typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
typedef OpaquePtr<TemplateName> TemplateTy;
typedef OpaquePtr<QualType> TypeTy;

OpenCLOptions OpenCLFeatures;
FPOptions FPFeatures;

const LangOptions &LangOpts;
Preprocessor &PP;
ASTContext &Context;
ASTConsumer &Consumer;
DiagnosticsEngine &Diags;
SourceManager &SourceMgr;

/// \brief Flag indicating whether or not to collect detailed statistics.
bool CollectStats;

/// \brief Code-completion consumer.
CodeCompleteConsumer *CodeCompleter;

/// CurContext - This is the current declaration context of parsing.
DeclContext *CurContext;

/// \brief Generally null except when we temporarily switch decl contexts,
/// like in \see ActOnObjCTemporaryExitContainerContext.
DeclContext *OriginalLexicalContext;

/// VAListTagName - The declaration name corresponding to __va_list_tag.
/// This is used as part of a hack to omit that class from ADL results.
DeclarationName VAListTagName;

bool MSStructPragmaOn; // True when \#pragma ms_struct on

/// \brief Controls member pointer representation format under the MS ABI.
LangOptions::PragmaMSPointersToMembersKind
    MSPointerToMemberRepresentationMethod;

/// Stack of active SEH __finally scopes.  Can be empty.
SmallVector<Scope*, 2> CurrentSEHFinally;

/// \brief Source location for newly created implicit MSInheritanceAttrs
SourceLocation ImplicitMSInheritanceAttrLoc;

/// \brief pragma clang section kind
enum PragmaClangSectionKind {
  PCSK_Invalid      = 0,
  PCSK_BSS          = 1,
  PCSK_Data         = 2,
  PCSK_Rodata       = 3,
  PCSK_Text         = 4
 };

enum PragmaClangSectionAction {
  PCSA_Set     = 0,
  PCSA_Clear   = 1
};

struct PragmaClangSection {
  std::string SectionName;
  bool Valid = false;
  SourceLocation PragmaLocation;

  void Act(SourceLocation PragmaLocation,
           PragmaClangSectionAction Action,
           StringLiteral* Name);
 };

 PragmaClangSection PragmaClangBSSSection;
 PragmaClangSection PragmaClangDataSection;
 PragmaClangSection PragmaClangRodataSection;
 PragmaClangSection PragmaClangTextSection;

enum PragmaMsStackAction {
  PSK_Reset     = 0x0,                // #pragma ()
  PSK_Set       = 0x1,                // #pragma (value)
  PSK_Push      = 0x2,                // #pragma (push[, id])
  PSK_Pop       = 0x4,                // #pragma (pop[, id])
  PSK_Show      = 0x8,                // #pragma (show) -- only for "pack"!
  PSK_Push_Set  = PSK_Push | PSK_Set, // #pragma (push[, id], value)
  PSK_Pop_Set   = PSK_Pop | PSK_Set,  // #pragma (pop[, id], value)
};

template<typename ValueType>
struct PragmaStack {
  struct Slot {
    llvm::StringRef StackSlotLabel;
    ValueType Value;
    SourceLocation PragmaLocation;
    SourceLocation PragmaPushLocation;
    Slot(llvm::StringRef StackSlotLabel, ValueType Value,
         SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
        : StackSlotLabel(StackSlotLabel), Value(Value),
          PragmaLocation(PragmaLocation),
          PragmaPushLocation(PragmaPushLocation) {}
  };
  void Act(SourceLocation PragmaLocation,
           PragmaMsStackAction Action,
           llvm::StringRef StackSlotLabel,
           ValueType Value);

  // MSVC seems to add artificial slots to #pragma stacks on entering a C++
  // method body to restore the stacks on exit, so it works like this:
  //
  //   struct S {
  //     #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
  //     void Method {}
  //     #pragma <name>(pop, InternalPragmaSlot)
  //   };
  //
  // It works even with #pragma vtordisp, although MSVC doesn't support
  //   #pragma vtordisp(push [, id], n)
  // syntax.
  //
  // Push / pop a named sentinel slot.
  void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
    assert((Action == PSK_Push || Action == PSK_Pop) &&(static_cast <bool> ((Action == PSK_Push || Action == PSK_Pop
) && "Can only push / pop #pragma stack sentinels!") ?
 void (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 424, __extension__ __PRETTY_FUNCTION__))
           "Can only push / pop #pragma stack sentinels!")(static_cast <bool> ((Action == PSK_Push || Action == PSK_Pop
) && "Can only push / pop #pragma stack sentinels!") ?
 void (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 424, __extension__ __PRETTY_FUNCTION__));
    Act(CurrentPragmaLocation, Action, Label, CurrentValue);
  }

  // Constructors.
  explicit PragmaStack(const ValueType &Default)
      : DefaultValue(Default), CurrentValue(Default) {}

  bool hasValue() const { return CurrentValue != DefaultValue; }

  SmallVector<Slot, 2> Stack;
  ValueType DefaultValue; // Value used for PSK_Reset action.
  ValueType CurrentValue;
  SourceLocation CurrentPragmaLocation;
};
// FIXME: We should serialize / deserialize these if they occur in a PCH (but
// we shouldn't do so if they're in a module).

/// \brief Whether to insert vtordisps prior to virtual bases in the Microsoft
/// C++ ABI.  Possible values are 0, 1, and 2, which mean:
///
/// 0: Suppress all vtordisps
/// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
///    structors
/// 2: Always insert vtordisps to support RTTI on partially constructed
///    objects
PragmaStack<MSVtorDispAttr::Mode> VtorDispStack;
// #pragma pack.
// Sentinel to represent when the stack is set to mac68k alignment.
static const unsigned kMac68kAlignmentSentinel = ~0U;
PragmaStack<unsigned> PackStack;
// The current #pragma pack values and locations at each #include.
struct PackIncludeState {
  unsigned CurrentValue;
  SourceLocation CurrentPragmaLocation;
  bool HasNonDefaultValue, ShouldWarnOnInclude;
};
SmallVector<PackIncludeState, 8> PackIncludeStack;
// Segment #pragmas.
PragmaStack<StringLiteral *> DataSegStack;
PragmaStack<StringLiteral *> BSSSegStack;
PragmaStack<StringLiteral *> ConstSegStack;
PragmaStack<StringLiteral *> CodeSegStack;

// RAII object to push / pop sentinel slots for all MS #pragma stacks.
// Actions should be performed only if we enter / exit a C++ method body.
class PragmaStackSentinelRAII {
public:
  PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
  ~PragmaStackSentinelRAII();

private:
  Sema &S;
  StringRef SlotLabel;
  bool ShouldAct;
};

/// A mapping that describes the nullability we've seen in each header file.
FileNullabilityMap NullabilityMap;

/// Last section used with #pragma init_seg.
StringLiteral *CurInitSeg;
SourceLocation CurInitSegLoc;

/// VisContext - Manages the stack for \#pragma GCC visibility.
void *VisContext; // Really a "PragmaVisStack*"

/// \brief This represents the stack of attributes that were pushed by
/// \#pragma clang attribute.
struct PragmaAttributeEntry {
  SourceLocation Loc;
  AttributeList *Attribute;
  SmallVector<attr::SubjectMatchRule, 4> MatchRules;
  bool IsUsed;
};
SmallVector<PragmaAttributeEntry, 2> PragmaAttributeStack;

/// \brief The declaration that is currently receiving an attribute from the
/// #pragma attribute stack.
const Decl *PragmaAttributeCurrentTargetDecl;

/// \brief This represents the last location of a "#pragma clang optimize off"
/// directive if such a directive has not been closed by an "on" yet. If
/// optimizations are currently "on", this is set to an invalid location.
SourceLocation OptimizeOffPragmaLocation;

/// \brief Flag indicating if Sema is building a recovery call expression.
///
/// This flag is used to avoid building recovery call expressions
/// if Sema is already doing so, which would cause infinite recursions.
bool IsBuildingRecoveryCallExpr;

/// Used to control the generation of ExprWithCleanups.
CleanupInfo Cleanup;

/// ExprCleanupObjects - This is the stack of objects requiring
/// cleanup that are created by the current full expression.  The
/// element type here is ExprWithCleanups::Object.
SmallVector<BlockDecl*, 8> ExprCleanupObjects;

/// \brief Store a list of either DeclRefExprs or MemberExprs
///  that contain a reference to a variable (constant) that may or may not
///  be odr-used in this Expr, and we won't know until all lvalue-to-rvalue
///  and discarded value conversions have been applied to all subexpressions
///  of the enclosing full expression.  This is cleared at the end of each
///  full expression.
llvm::SmallPtrSet<Expr*, 2> MaybeODRUseExprs;

/// \brief Stack containing information about each of the nested
/// function, block, and method scopes that are currently active.
///
/// This array is never empty.  Clients should ignore the first
/// element, which is used to cache a single FunctionScopeInfo
/// that's used to parse every top-level function.
SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;

typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
  ExtVectorDeclsType;

/// ExtVectorDecls - This is a list all the extended vector types. This allows
/// us to associate a raw vector type with one of the ext_vector type names.
/// This is only necessary for issuing pretty diagnostics.
ExtVectorDeclsType ExtVectorDecls;

/// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
std::unique_ptr<CXXFieldCollector> FieldCollector;

typedef llvm::SmallSetVector<const NamedDecl*, 16> NamedDeclSetType;

/// \brief Set containing all declared private fields that are not used.
NamedDeclSetType UnusedPrivateFields;

/// \brief Set containing all typedefs that are likely unused.
llvm::SmallSetVector<const TypedefNameDecl *, 4>
    UnusedLocalTypedefNameCandidates;

/// \brief Delete-expressions to be analyzed at the end of translation unit
///
/// This list contains class members, and locations of delete-expressions
/// that could not be proven as to whether they mismatch with new-expression
/// used in initializer of the field.
typedef std::pair<SourceLocation, bool> DeleteExprLoc;
typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;

typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;

/// PureVirtualClassDiagSet - a set of class declarations which we have
/// emitted a list of pure virtual functions. Used to prevent emitting the
/// same list more than once.
std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;

/// ParsingInitForAutoVars - a set of declarations with auto types for which
/// we are currently parsing the initializer.
llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;

/// \brief Look for a locally scoped extern "C" declaration by the given name.
NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);

typedef LazyVector<VarDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
  TentativeDefinitionsType;

/// \brief All the tentative definitions encountered in the TU.
TentativeDefinitionsType TentativeDefinitions;

typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
  UnusedFileScopedDeclsType;

/// \brief The set of file scoped decls seen so far that have not been used
/// and must warn if not used. Only contains the first declaration.
UnusedFileScopedDeclsType UnusedFileScopedDecls;

typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
                   &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
  DelegatingCtorDeclsType;

/// \brief All the delegating constructors seen so far in the file, used for
/// cycle detection at the end of the TU.
DelegatingCtorDeclsType DelegatingCtorDecls;

/// \brief All the overriding functions seen during a class definition
/// that had their exception spec checks delayed, plus the overridden
/// function.
SmallVector<std::pair<const CXXMethodDecl*, const CXXMethodDecl*>, 2>
  DelayedExceptionSpecChecks;

/// \brief All the members seen during a class definition which were both
/// explicitly defaulted and had explicitly-specified exception
/// specifications, along with the function type containing their
/// user-specified exception specification. Those exception specifications
/// were overridden with the default specifications, but we still need to
/// check whether they are compatible with the default specification, and
/// we can't do that until the nesting set of class definitions is complete.
SmallVector<std::pair<CXXMethodDecl*, const FunctionProtoType*>, 2>
  DelayedDefaultedMemberExceptionSpecs;

typedef llvm::MapVector<const FunctionDecl *,
                        std::unique_ptr<LateParsedTemplate>>
    LateParsedTemplateMapT;
LateParsedTemplateMapT LateParsedTemplateMap;

/// \brief Callback to the parser to parse templated functions when needed.
typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
typedef void LateTemplateParserCleanupCB(void *P);
LateTemplateParserCB *LateTemplateParser;
LateTemplateParserCleanupCB *LateTemplateParserCleanup;
void *OpaqueParser;

void SetLateTemplateParser(LateTemplateParserCB *LTP,
                           LateTemplateParserCleanupCB *LTPCleanup,
                           void *P) {
  LateTemplateParser = LTP;
  LateTemplateParserCleanup = LTPCleanup;
  OpaqueParser = P;
}

class DelayedDiagnostics;

class DelayedDiagnosticsState {
  sema::DelayedDiagnosticPool *SavedPool;
  friend class Sema::DelayedDiagnostics;
};
typedef DelayedDiagnosticsState ParsingDeclState;
typedef DelayedDiagnosticsState ProcessingContextState;

/// A class which encapsulates the logic for delaying diagnostics
/// during parsing and other processing.
class DelayedDiagnostics {
  /// \brief The current pool of diagnostics into which delayed
  /// diagnostics should go.
  sema::DelayedDiagnosticPool *CurPool;

public:
  DelayedDiagnostics() : CurPool(nullptr) {}

  /// Adds a delayed diagnostic.
  void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h

  /// Determines whether diagnostics should be delayed.
  bool shouldDelayDiagnostics() { return CurPool != nullptr; }

  /// Returns the current delayed-diagnostics pool.
  sema::DelayedDiagnosticPool *getCurrentPool() const {
    return CurPool;
  }

  /// Enter a new scope.  Access and deprecation diagnostics will be
  /// collected in this pool.
  DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = &pool;
    return state;
  }

  /// Leave a delayed-diagnostic state that was previously pushed.
  /// Do not emit any of the diagnostics.  This is performed as part
  /// of the bookkeeping of popping a pool "properly".
  void popWithoutEmitting(DelayedDiagnosticsState state) {
    CurPool = state.SavedPool;
  }

  /// Enter a new scope where access and deprecation diagnostics are
  /// not delayed.
  DelayedDiagnosticsState pushUndelayed() {
    DelayedDiagnosticsState state;
    state.SavedPool = CurPool;
    CurPool = nullptr;
    return state;
  }

  /// Undo a previous pushUndelayed().
  void popUndelayed(DelayedDiagnosticsState state) {
    assert(CurPool == nullptr)(static_cast <bool> (CurPool == nullptr) ? void (0) : __assert_fail
 ("CurPool == nullptr", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 700, __extension__ __PRETTY_FUNCTION__));
    CurPool = state.SavedPool;
  }
} DelayedDiagnostics;

/// A RAII object to temporarily push a declaration context.
class ContextRAII {
private:
  Sema &S;
  DeclContext *SavedContext;
  ProcessingContextState SavedContextState;
  QualType SavedCXXThisTypeOverride;

public:
  ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
    : S(S), SavedContext(S.CurContext),
      SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
      SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
  {
    assert(ContextToPush && "pushing null context")(static_cast <bool> (ContextToPush && "pushing null context"
) ? void (0) : __assert_fail ("ContextToPush && \"pushing null context\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 719, __extension__ __PRETTY_FUNCTION__));
    S.CurContext = ContextToPush;
    if (NewThisContext)
      S.CXXThisTypeOverride = QualType();
  }

  void pop() {
    if (!SavedContext) return;
    S.CurContext = SavedContext;
    S.DelayedDiagnostics.popUndelayed(SavedContextState);
    S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
    SavedContext = nullptr;
  }

  ~ContextRAII() {
    pop();
  }
};

/// \brief RAII object to handle the state changes required to synthesize
/// a function body.
class SynthesizedFunctionScope {
  Sema &S;
  Sema::ContextRAII SavedContext;
  bool PushedCodeSynthesisContext = false;

public:
  SynthesizedFunctionScope(Sema &S, DeclContext *DC)
      : S(S), SavedContext(S, DC) {
    S.PushFunctionScope();
    S.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
    if (auto *FD = dyn_cast<FunctionDecl>(DC))
      FD->setWillHaveBody(true);
    else
      assert(isa<ObjCMethodDecl>(DC))(static_cast <bool> (isa<ObjCMethodDecl>(DC)) ? void
 (0) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 754, __extension__ __PRETTY_FUNCTION__));
  }

  void addContextNote(SourceLocation UseLoc) {
    assert(!PushedCodeSynthesisContext)(static_cast <bool> (!PushedCodeSynthesisContext) ? void
 (0) : __assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 758, __extension__ __PRETTY_FUNCTION__));

    Sema::CodeSynthesisContext Ctx;
    Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
    Ctx.PointOfInstantiation = UseLoc;
    Ctx.Entity = cast<Decl>(S.CurContext);
    S.pushCodeSynthesisContext(Ctx);

    PushedCodeSynthesisContext = true;
  }

  ~SynthesizedFunctionScope() {
    if (PushedCodeSynthesisContext)
      S.popCodeSynthesisContext();
    if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
      FD->setWillHaveBody(false);
    S.PopExpressionEvaluationContext();
    S.PopFunctionScopeInfo();
  }
};

/// WeakUndeclaredIdentifiers - Identifiers contained in
/// \#pragma weak before declared. rare. may alias another
/// identifier, declared or undeclared
llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;

/// ExtnameUndeclaredIdentifiers - Identifiers contained in
/// \#pragma redefine_extname before declared.  Used in Solaris system headers
/// to define functions that occur in multiple standards to call the version
/// in the currently selected standard.
llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;


/// \brief Load weak undeclared identifiers from the external source.
void LoadExternalWeakUndeclaredIdentifiers();

/// WeakTopLevelDecl - Translation-unit scoped declarations generated by
/// \#pragma weak during processing of other Decls.
/// I couldn't figure out a clean way to generate these in-line, so
/// we store them here and handle separately -- which is a hack.
/// It would be best to refactor this.
SmallVector<Decl*,2> WeakTopLevelDecl;

IdentifierResolver IdResolver;

/// Translation Unit Scope - useful to Objective-C actions that need
/// to lookup file scope declarations in the "ordinary" C decl namespace.
/// For example, user-defined classes, built-in "id" type, etc.
Scope *TUScope;

/// \brief The C++ "std" namespace, where the standard library resides.
LazyDeclPtr StdNamespace;

/// \brief The C++ "std::bad_alloc" class, which is defined by the C++
/// standard library.
LazyDeclPtr StdBadAlloc;

/// \brief The C++ "std::align_val_t" enum class, which is defined by the C++
/// standard library.
LazyDeclPtr StdAlignValT;

/// \brief The C++ "std::experimental" namespace, where the experimental parts
/// of the standard library resides.
NamespaceDecl *StdExperimentalNamespaceCache;

/// \brief The C++ "std::initializer_list" template, which is defined in
/// \<initializer_list>.
ClassTemplateDecl *StdInitializerList;

/// \brief The C++ "type_info" declaration, which is defined in \<typeinfo>.
RecordDecl *CXXTypeInfoDecl;

/// \brief The MSVC "_GUID" struct, which is defined in MSVC header files.
RecordDecl *MSVCGuidDecl;

/// \brief Caches identifiers/selectors for NSFoundation APIs.
std::unique_ptr<NSAPI> NSAPIObj;

/// \brief The declaration of the Objective-C NSNumber class.
ObjCInterfaceDecl *NSNumberDecl;

/// \brief The declaration of the Objective-C NSValue class.
ObjCInterfaceDecl *NSValueDecl;

/// \brief Pointer to NSNumber type (NSNumber *).
QualType NSNumberPointer;

/// \brief Pointer to NSValue type (NSValue *).
QualType NSValuePointer;

/// \brief The Objective-C NSNumber methods used to create NSNumber literals.
ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];

/// \brief The declaration of the Objective-C NSString class.
ObjCInterfaceDecl *NSStringDecl;

/// \brief Pointer to NSString type (NSString *).
QualType NSStringPointer;

/// \brief The declaration of the stringWithUTF8String: method.
ObjCMethodDecl *StringWithUTF8StringMethod;

/// \brief The declaration of the valueWithBytes:objCType: method.
ObjCMethodDecl *ValueWithBytesObjCTypeMethod;

/// \brief The declaration of the Objective-C NSArray class.
ObjCInterfaceDecl *NSArrayDecl;

/// \brief The declaration of the arrayWithObjects:count: method.
ObjCMethodDecl *ArrayWithObjectsMethod;

/// \brief The declaration of the Objective-C NSDictionary class.
ObjCInterfaceDecl *NSDictionaryDecl;

/// \brief The declaration of the dictionaryWithObjects:forKeys:count: method.
ObjCMethodDecl *DictionaryWithObjectsMethod;

/// \brief id<NSCopying> type.
QualType QIDNSCopying;

/// \brief will hold 'respondsToSelector:'
Selector RespondsToSelectorSel;

/// A flag to remember whether the implicit forms of operator new and delete
/// have been declared.
bool GlobalNewDeleteDeclared;

/// A flag to indicate that we're in a context that permits abstract
/// references to fields.  This is really a
bool AllowAbstractFieldReference;

/// \brief Describes how the expressions currently being parsed are
/// evaluated at run-time, if at all.
enum class ExpressionEvaluationContext {
  /// \brief The current expression and its subexpressions occur within an
  /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
  /// \c sizeof, where the type of the expression may be significant but
  /// no code will be generated to evaluate the value of the expression at
  /// run time.
  Unevaluated,

  /// \brief The current expression occurs within a braced-init-list within
  /// an unevaluated operand. This is mostly like a regular unevaluated
  /// context, except that we still instantiate constexpr functions that are
  /// referenced here so that we can perform narrowing checks correctly.
  UnevaluatedList,

  /// \brief The current expression occurs within a discarded statement.
  /// This behaves largely similarly to an unevaluated operand in preventing
  /// definitions from being required, but not in other ways.
  DiscardedStatement,

  /// \brief The current expression occurs within an unevaluated
  /// operand that unconditionally permits abstract references to
  /// fields, such as a SIZE operator in MS-style inline assembly.
  UnevaluatedAbstract,

  /// \brief The current context is "potentially evaluated" in C++11 terms,
  /// but the expression is evaluated at compile-time (like the values of
  /// cases in a switch statement).
  ConstantEvaluated,

  /// \brief The current expression is potentially evaluated at run time,
  /// which means that code may be generated to evaluate the value of the
  /// expression at run time.
  PotentiallyEvaluated,

  /// \brief The current expression is potentially evaluated, but any
  /// declarations referenced inside that expression are only used if
  /// in fact the current expression is used.
  ///
  /// This value is used when parsing default function arguments, for which
  /// we would like to provide diagnostics (e.g., passing non-POD arguments
  /// through varargs) but do not want to mark declarations as "referenced"
  /// until the default argument is used.
  PotentiallyEvaluatedIfUsed
};

/// \brief Data structure used to record current or nested
/// expression evaluation contexts.
struct ExpressionEvaluationContextRecord {
  /// \brief The expression evaluation context.
  ExpressionEvaluationContext Context;

  /// \brief Whether the enclosing context needed a cleanup.
  CleanupInfo ParentCleanup;

  /// \brief Whether we are in a decltype expression.
  bool IsDecltype;

  /// \brief The number of active cleanup objects when we entered
  /// this expression evaluation context.
  unsigned NumCleanupObjects;

  /// \brief The number of typos encountered during this expression evaluation
  /// context (i.e. the number of TypoExprs created).
  unsigned NumTypos;

  llvm::SmallPtrSet<Expr*, 2> SavedMaybeODRUseExprs;

  /// \brief The lambdas that are present within this context, if it
  /// is indeed an unevaluated context.
  SmallVector<LambdaExpr *, 2> Lambdas;

  /// \brief The declaration that provides context for lambda expressions
  /// and block literals if the normal declaration context does not
  /// suffice, e.g., in a default function argument.
  Decl *ManglingContextDecl;

  /// \brief The context information used to mangle lambda expressions
  /// and block literals within this context.
  ///
  /// This mangling information is allocated lazily, since most contexts
  /// do not have lambda expressions or block literals.
  std::unique_ptr<MangleNumberingContext> MangleNumbering;

  /// \brief If we are processing a decltype type, a set of call expressions
  /// for which we have deferred checking the completeness of the return type.
  SmallVector<CallExpr *, 8> DelayedDecltypeCalls;

  /// \brief If we are processing a decltype type, a set of temporary binding
  /// expressions for which we have deferred checking the destructor.
  SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;

  ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
                                    unsigned NumCleanupObjects,
                                    CleanupInfo ParentCleanup,
                                    Decl *ManglingContextDecl,
                                    bool IsDecltype)
    : Context(Context), ParentCleanup(ParentCleanup),
      IsDecltype(IsDecltype), NumCleanupObjects(NumCleanupObjects),
      NumTypos(0),
      ManglingContextDecl(ManglingContextDecl), MangleNumbering() { }

  /// \brief Retrieve the mangling numbering context, used to consistently
  /// number constructs like lambdas for mangling.
  MangleNumberingContext &getMangleNumberingContext(ASTContext &Ctx);

  bool isUnevaluated() const {
    return Context == ExpressionEvaluationContext::Unevaluated ||
           Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
           Context == ExpressionEvaluationContext::UnevaluatedList;
  }
  bool isConstantEvaluated() const {
    return Context == ExpressionEvaluationContext::ConstantEvaluated;
  }
};

/// A stack of expression evaluation contexts.
SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;

/// \brief Compute the mangling number context for a lambda expression or
/// block literal.
///
/// \param DC - The DeclContext containing the lambda expression or
/// block literal.
/// \param[out] ManglingContextDecl - Returns the ManglingContextDecl
/// associated with the context, if relevant.
MangleNumberingContext *getCurrentMangleNumberContext(
  const DeclContext *DC,
  Decl *&ManglingContextDecl);


/// SpecialMemberOverloadResult - The overloading result for a special member
/// function.
///
/// This is basically a wrapper around PointerIntPair. The lowest bits of the
/// integer are used to determine whether overload resolution succeeded.
class SpecialMemberOverloadResult {
public:
  enum Kind {
    NoMemberOrDeleted,
    Ambiguous,
    Success
  };

private:
  llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;

public:
  SpecialMemberOverloadResult() : Pair() {}
  SpecialMemberOverloadResult(CXXMethodDecl *MD)
      : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}

  CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
  void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }

  Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
  void setKind(Kind K) { Pair.setInt(K); }
};

class SpecialMemberOverloadResultEntry
    : public llvm::FastFoldingSetNode,
      public SpecialMemberOverloadResult {
public:
  SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
    : FastFoldingSetNode(ID)
  {}
};

/// \brief A cache of special member function overload resolution results
/// for C++ records.
llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;

/// \brief A cache of the flags available in enumerations with the flag_bits
/// attribute.
mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;

/// \brief The kind of translation unit we are processing.
///
/// When we're processing a complete translation unit, Sema will perform
/// end-of-translation-unit semantic tasks (such as creating
/// initializers for tentative definitions in C) once parsing has
/// completed. Modules and precompiled headers perform different kinds of
/// checks.
TranslationUnitKind TUKind;

llvm::BumpPtrAllocator BumpAlloc;

/// \brief The number of SFINAE diagnostics that have been trapped.
unsigned NumSFINAEErrors;

typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
  UnparsedDefaultArgInstantiationsMap;

/// \brief A mapping from parameters with unparsed default arguments to the
/// set of instantiations of each parameter.
///
/// This mapping is a temporary data structure used when parsing
/// nested class templates or nested classes of class templates,
/// where we might end up instantiating an inner class before the
/// default arguments of its methods have been parsed.
UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;

// Contains the locations of the beginning of unparsed default
// argument locations.
llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;

/// UndefinedInternals - all the used, undefined objects which require a
/// definition in this translation unit.
llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;

/// Determine if VD, which must be a variable or function, is an external
/// symbol that nonetheless can't be referenced from outside this translation
/// unit because its type has no linkage and it's not extern "C".
bool isExternalWithNoLinkageType(ValueDecl *VD);

/// Obtain a sorted list of functions that are undefined but ODR-used.
void getUndefinedButUsed(
    SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);

/// Retrieves list of suspicious delete-expressions that will be checked at
/// the end of translation unit.
const llvm::MapVector<FieldDecl *, DeleteLocs> &
getMismatchingDeleteExpressions() const;

typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;

/// Method Pool - allows efficient lookup when typechecking messages to "id".
/// We need to maintain a list, since selectors can have differing signatures
/// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
/// of selectors are "overloaded").
/// At the head of the list it is recorded whether there were 0, 1, or >= 2
/// methods inside categories with a particular selector.
GlobalMethodPool MethodPool;

/// Method selectors used in a \@selector expression. Used for implementation
/// of -Wselector.
llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;

/// Kinds of C++ special members.
enum CXXSpecialMember {
  CXXDefaultConstructor,
  CXXCopyConstructor,
  CXXMoveConstructor,
  CXXCopyAssignment,
  CXXMoveAssignment,
  CXXDestructor,
  CXXInvalid
};

typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
    SpecialMemberDecl;

/// The C++ special members which we are currently in the process of
/// declaring. If this process recursively triggers the declaration of the
/// same special member, we should act as if it is not yet declared.
llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;

/// The function definitions which were renamed as part of typo-correction
/// to match their respective declarations. We want to keep track of them
/// to ensure that we don't emit a "redefinition" error if we encounter a
/// correctly named definition after the renamed definition.
llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;

/// Stack of types that correspond to the parameter entities that are
/// currently being copy-initialized. Can be empty.
llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;

void ReadMethodPool(Selector Sel);
void updateOutOfDateSelector(Selector Sel);

/// Private Helper predicate to check for 'self'.
bool isSelfExpr(Expr *RExpr);
bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);

/// \brief Cause the active diagnostic on the DiagosticsEngine to be
/// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
/// should not be used elsewhere.
void EmitCurrentDiagnostic(unsigned DiagID);

/// Records and restores the FP_CONTRACT state on entry/exit of compound
/// statements.
class FPContractStateRAII {
public:
  FPContractStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
  ~FPContractStateRAII() { S.FPFeatures = OldFPFeaturesState; }

private:
  Sema& S;
  FPOptions OldFPFeaturesState;
};

void addImplicitTypedef(StringRef Name, QualType T);

1184public:
Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
     TranslationUnitKind TUKind = TU_Complete,
     CodeCompleteConsumer *CompletionConsumer = nullptr);
~Sema();

/// \brief Perform initialization that occurs after the parser has been
/// initialized but before it parses anything.
void Initialize();

const LangOptions &getLangOpts() const { return LangOpts; }
OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
FPOptions     &getFPOptions() { return FPFeatures; }

DiagnosticsEngine &getDiagnostics() const { return Diags; }
SourceManager &getSourceManager() const { return SourceMgr; }
Preprocessor &getPreprocessor() const { return PP; }
ASTContext &getASTContext() const { return Context; }
ASTConsumer &getASTConsumer() const { return Consumer; }
ASTMutationListener *getASTMutationListener() const;
ExternalSemaSource* getExternalSource() const { return ExternalSource; }

///\brief Registers an external source. If an external source already exists,
/// creates a multiplex external source and appends to it.
///
///\param[in] E - A non-null external sema source.
///
void addExternalSource(ExternalSemaSource *E);

void PrintStats() const;

/// \brief Helper class that creates diagnostics with optional
/// template instantiation stacks.
///
/// This class provides a wrapper around the basic DiagnosticBuilder
/// class that emits diagnostics. SemaDiagnosticBuilder is
/// responsible for emitting the diagnostic (as DiagnosticBuilder
/// does) and, if the diagnostic comes from inside a template
/// instantiation, printing the template instantiation stack as
/// well.
class SemaDiagnosticBuilder : public DiagnosticBuilder {
  Sema &SemaRef;
  unsigned DiagID;

public:
  SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
    : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }

  // This is a cunning lie. DiagnosticBuilder actually performs move
  // construction in its copy constructor (but due to varied uses, it's not
  // possible to conveniently express this as actual move construction). So
  // the default copy ctor here is fine, because the base class disables the
  // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
  // in that case anwyay.
  SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;

  ~SemaDiagnosticBuilder() {
    // If we aren't active, there is nothing to do.
    if (!isActive()) return;

    // Otherwise, we need to emit the diagnostic. First flush the underlying
    // DiagnosticBuilder data, and clear the diagnostic builder itself so it
    // won't emit the diagnostic in its own destructor.
    //
    // This seems wasteful, in that as written the DiagnosticBuilder dtor will
    // do its own needless checks to see if the diagnostic needs to be
    // emitted. However, because we take care to ensure that the builder
    // objects never escape, a sufficiently smart compiler will be able to
    // eliminate that code.
    FlushCounts();
    Clear();

    // Dispatch to Sema to emit the diagnostic.
    SemaRef.EmitCurrentDiagnostic(DiagID);
  }

  /// Teach operator<< to produce an object of the correct type.
  template<typename T>
  friend const SemaDiagnosticBuilder &operator<<(
      const SemaDiagnosticBuilder &Diag, const T &Value) {
    const DiagnosticBuilder &BaseDiag = Diag;
    BaseDiag << Value;
    return Diag;
  }
};

/// \brief Emit a diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) {
  DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
  return SemaDiagnosticBuilder(DB, *this, DiagID);
}

/// \brief Emit a partial diagnostic.
SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic& PD);

/// \brief Build a partial diagnostic.
PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h

bool findMacroSpelling(SourceLocation &loc, StringRef name);

/// \brief Get a string to suggest for zero-initialization of a type.
std::string
getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;

/// \brief Calls \c Lexer::getLocForEndOfToken()
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);

/// \brief Retrieve the module loader associated with the preprocessor.
ModuleLoader &getModuleLoader() const;

void emitAndClearUnusedLocalTypedefWarnings();

void ActOnStartOfTranslationUnit();
void ActOnEndOfTranslationUnit();

void CheckDelegatingCtorCycles();

Scope *getScopeForContext(DeclContext *Ctx);

void PushFunctionScope();
void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
sema::LambdaScopeInfo *PushLambdaScope();

/// \brief This is used to inform Sema what the current TemplateParameterDepth
/// is during Parsing.  Currently it is used to pass on the depth
/// when parsing generic lambda 'auto' parameters.
void RecordParsingTemplateParameterDepth(unsigned Depth);

void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
                             RecordDecl *RD,
                             CapturedRegionKind K);
void
PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
                     const Decl *D = nullptr,
                     const BlockExpr *blkExpr = nullptr);

sema::FunctionScopeInfo *getCurFunction() const {
  return FunctionScopes.back();
}

sema::FunctionScopeInfo *getEnclosingFunction() const {
  if (FunctionScopes.empty())
    return nullptr;

  for (int e = FunctionScopes.size()-1; e >= 0; --e) {
    if (isa<sema::BlockScopeInfo>(FunctionScopes[e]))
      continue;
    return FunctionScopes[e];
  }
  return nullptr;
}

template <typename ExprT>
void recordUseOfEvaluatedWeak(const ExprT *E, bool IsRead=true) {
  if (!isUnevaluatedContext())
    getCurFunction()->recordUseOfWeak(E, IsRead);
}

void PushCompoundScope(bool IsStmtExpr);
void PopCompoundScope();

sema::CompoundScopeInfo &getCurCompoundScope() const;

bool hasAnyUnrecoverableErrorsInThisFunction() const;

/// \brief Retrieve the current block, if any.
sema::BlockScopeInfo *getCurBlock();

/// Retrieve the current lambda scope info, if any.
/// \param IgnoreNonLambdaCapturingScope true if should find the top-most
/// lambda scope info ignoring all inner capturing scopes that are not
/// lambda scopes.
sema::LambdaScopeInfo *
getCurLambda(bool IgnoreNonLambdaCapturingScope = false);

/// \brief Retrieve the current generic lambda info, if any.
sema::LambdaScopeInfo *getCurGenericLambda();

/// \brief Retrieve the current captured region, if any.
sema::CapturedRegionScopeInfo *getCurCapturedRegion();

/// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }

void ActOnComment(SourceRange Comment);

//===--------------------------------------------------------------------===//
// Type Analysis / Processing: SemaType.cpp.
//

QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
                            const DeclSpec *DS = nullptr);
QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
                            const DeclSpec *DS = nullptr);
QualType BuildPointerType(QualType T,
                          SourceLocation Loc, DeclarationName Entity);
QualType BuildReferenceType(QualType T, bool LValueRef,
                            SourceLocation Loc, DeclarationName Entity);
QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
                        Expr *ArraySize, unsigned Quals,
                        SourceRange Brackets, DeclarationName Entity);
QualType BuildExtVectorType(QualType T, Expr *ArraySize,
                            SourceLocation AttrLoc);
QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
                               SourceLocation AttrLoc);

bool CheckFunctionReturnType(QualType T, SourceLocation Loc);

/// \brief Build a function type.
///
/// This routine checks the function type according to C++ rules and
/// under the assumption that the result type and parameter types have
/// just been instantiated from a template. It therefore duplicates
/// some of the behavior of GetTypeForDeclarator, but in a much
/// simpler form that is only suitable for this narrow use case.
///
/// \param T The return type of the function.
///
/// \param ParamTypes The parameter types of the function. This array
/// will be modified to account for adjustments to the types of the
/// function parameters.
///
/// \param Loc The location of the entity whose type involves this
/// function type or, if there is no such entity, the location of the
/// type that will have function type.
///
/// \param Entity The name of the entity that involves the function
/// type, if known.
///
/// \param EPI Extra information about the function type. Usually this will
/// be taken from an existing function with the same prototype.
///
/// \returns A suitable function type, if there are no errors. The
/// unqualified type will always be a FunctionProtoType.
/// Otherwise, returns a NULL type.
QualType BuildFunctionType(QualType T,
                           MutableArrayRef<QualType> ParamTypes,
                           SourceLocation Loc, DeclarationName Entity,
                           const FunctionProtoType::ExtProtoInfo &EPI);

QualType BuildMemberPointerType(QualType T, QualType Class,
                                SourceLocation Loc,
                                DeclarationName Entity);
QualType BuildBlockPointerType(QualType T,
                               SourceLocation Loc, DeclarationName Entity);
QualType BuildParenType(QualType T);
QualType BuildAtomicType(QualType T, SourceLocation Loc);
QualType BuildReadPipeType(QualType T,
                       SourceLocation Loc);
QualType BuildWritePipeType(QualType T,
                       SourceLocation Loc);

TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
                                             TypeSourceInfo *ReturnTypeInfo);

/// \brief Package the given type and TSI into a ParsedType.
ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
DeclarationNameInfo GetNameForDeclarator(Declarator &D);
DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
static QualType GetTypeFromParser(ParsedType Ty,
                                  TypeSourceInfo **TInfo = nullptr);
CanThrowResult canThrow(const Expr *E);
const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
                                              const FunctionProtoType *FPT);
void UpdateExceptionSpec(FunctionDecl *FD,
                         const FunctionProtoType::ExceptionSpecInfo &ESI);
bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
bool CheckDistantExceptionSpec(QualType T);
bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
bool CheckEquivalentExceptionSpec(
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool CheckEquivalentExceptionSpec(
    const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
    const FunctionProtoType *Old, SourceLocation OldLoc,
    const FunctionProtoType *New, SourceLocation NewLoc);
bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
                              const PartialDiagnostic &NestedDiagID,
                              const PartialDiagnostic &NoteID,
                              const FunctionProtoType *Superset,
                              SourceLocation SuperLoc,
                              const FunctionProtoType *Subset,
                              SourceLocation SubLoc);
bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
                             const PartialDiagnostic &NoteID,
                             const FunctionProtoType *Target,
                             SourceLocation TargetLoc,
                             const FunctionProtoType *Source,
                             SourceLocation SourceLoc);

TypeResult ActOnTypeName(Scope *S, Declarator &D);

/// \brief The parser has parsed the context-sensitive type 'instancetype'
/// in an Objective-C message declaration. Return the appropriate type.
ParsedType ActOnObjCInstanceType(SourceLocation Loc);

/// \brief Abstract class used to diagnose incomplete types.
struct TypeDiagnoser {
  TypeDiagnoser() {}

  virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
  virtual ~TypeDiagnoser() {}
};

static int getPrintable(int I) { return I; }
static unsigned getPrintable(unsigned I) { return I; }
static bool getPrintable(bool B) { return B; }
static const char * getPrintable(const char *S) { return S; }
static StringRef getPrintable(StringRef S) { return S; }
static const std::string &getPrintable(const std::string &S) { return S; }
static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
  return II;
}
static DeclarationName getPrintable(DeclarationName N) { return N; }
static QualType getPrintable(QualType T) { return T; }
static SourceRange getPrintable(SourceRange R) { return R; }
static SourceRange getPrintable(SourceLocation L) { return L; }
static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}

template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
  unsigned DiagID;
  std::tuple<const Ts &...> Args;

  template <std::size_t... Is>
  void emit(const SemaDiagnosticBuilder &DB,
            llvm::index_sequence<Is...>) const {
    // Apply all tuple elements to the builder in order.
    bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
    (void)Dummy;
  }

public:
  BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
      : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
    assert(DiagID != 0 && "no diagnostic for type diagnoser")(static_cast <bool> (DiagID != 0 && "no diagnostic for type diagnoser"
) ? void (0) : __assert_fail ("DiagID != 0 && \"no diagnostic for type diagnoser\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1523, __extension__ __PRETTY_FUNCTION__));
  }

  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
    const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
    emit(DB, llvm::index_sequence_for<Ts...>());
    DB << T;
  }
};

1533private:
bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
                             TypeDiagnoser *Diagnoser);

struct ModuleScope {
  clang::Module *Module = nullptr;
  bool ModuleInterface = false;
  VisibleModuleSet OuterVisibleModules;
};
/// The modules we're currently parsing.
llvm::SmallVector<ModuleScope, 16> ModuleScopes;

/// Get the module whose scope we are currently within.
Module *getCurrentModule() const {
  return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
}

VisibleModuleSet VisibleModules;

1552public:
/// \brief Get the module owning an entity.
Module *getOwningModule(Decl *Entity) { return Entity->getOwningModule(); }

/// \brief Make a merged definition of an existing hidden definition \p ND
/// visible at the specified location.
void makeMergedDefinitionVisible(NamedDecl *ND);

bool isModuleVisible(const Module *M) { return VisibleModules.isVisible(M); }

/// Determine whether a declaration is visible to name lookup.
bool isVisible(const NamedDecl *D) {
  return !D->isHidden() || isVisibleSlow(D);
}

/// Determine whether any declaration of an entity is visible.
bool
hasVisibleDeclaration(const NamedDecl *D,
                      llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
  return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
}
bool hasVisibleDeclarationSlow(const NamedDecl *D,
                               llvm::SmallVectorImpl<Module *> *Modules);

bool hasVisibleMergedDefinition(NamedDecl *Def);
bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);

/// Determine if \p D and \p Suggested have a structurally compatible
/// layout as described in C11 6.2.7/1.
bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);

/// Determine if \p D has a visible definition. If not, suggest a declaration
/// that should be made visible to expose the definition.
bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
                          bool OnlyNeedComplete = false);
bool hasVisibleDefinition(const NamedDecl *D) {
  NamedDecl *Hidden;
  return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
}

/// Determine if the template parameter \p D has a visible default argument.
bool
hasVisibleDefaultArgument(const NamedDecl *D,
                          llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is an explicit
/// specialization declaration for a specialization of a template. (For a
/// member specialization, use hasVisibleMemberSpecialization.)
bool hasVisibleExplicitSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if there is a visible declaration of \p D that is a member
/// specialization declaration (as opposed to an instantiated declaration).
bool hasVisibleMemberSpecialization(
    const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);

/// Determine if \p A and \p B are equivalent internal linkage declarations
/// from different modules, and thus an ambiguity error can be downgraded to
/// an extension warning.
bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
                                            const NamedDecl *B);
void diagnoseEquivalentInternalLinkageDeclarations(
    SourceLocation Loc, const NamedDecl *D,
    ArrayRef<const NamedDecl *> Equiv);

bool isCompleteType(SourceLocation Loc, QualType T) {
  return !RequireCompleteTypeImpl(Loc, T, nullptr);
}
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         TypeDiagnoser &Diagnoser);
bool RequireCompleteType(SourceLocation Loc, QualType T,
                         unsigned DiagID);

template <typename... Ts>
bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
                         const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteType(Loc, T, Diagnoser);
}

void completeExprArrayBound(Expr *E);
bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
bool RequireCompleteExprType(Expr *E, unsigned DiagID);

template <typename... Ts>
bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireCompleteExprType(E, Diagnoser);
}

bool RequireLiteralType(SourceLocation Loc, QualType T,
                        TypeDiagnoser &Diagnoser);
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);

template <typename... Ts>
bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
                        const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireLiteralType(Loc, T, Diagnoser);
}

QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
                           const CXXScopeSpec &SS, QualType T);

QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
/// If AsUnevaluated is false, E is treated as though it were an evaluated
/// context, such as when building a type for decltype(auto).
QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
                           bool AsUnevaluated = true);
QualType BuildUnaryTransformType(QualType BaseType,
                                 UnaryTransformType::UTTKind UKind,
                                 SourceLocation Loc);

//===--------------------------------------------------------------------===//
// Symbol table / Decl tracking callbacks: SemaDecl.cpp.
//

struct SkipBodyInfo {
  SkipBodyInfo()
      : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
        New(nullptr) {}
  bool ShouldSkip;
  bool CheckSameAsPrevious;
  NamedDecl *Previous;
  NamedDecl *New;
};

DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);

void DiagnoseUseOfUnimplementedSelectors();

bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;

ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
                       Scope *S, CXXScopeSpec *SS = nullptr,
                       bool isClassName = false, bool HasTrailingDot = false,
                       ParsedType ObjectType = nullptr,
                       bool IsCtorOrDtorName = false,
                       bool WantNontrivialTypeSourceInfo = false,
                       bool IsClassTemplateDeductionContext = true,
                       IdentifierInfo **CorrectedII = nullptr);
TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
void DiagnoseUnknownTypeName(IdentifierInfo *&II,
                             SourceLocation IILoc,
                             Scope *S,
                             CXXScopeSpec *SS,
                             ParsedType &SuggestedType,
                             bool IsTemplateName = false);

/// Attempt to behave like MSVC in situations where lookup of an unqualified
/// type name has failed in a dependent context. In these situations, we
/// automatically form a DependentTypeName that will retry lookup in a related
/// scope during instantiation.
ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
                                    SourceLocation NameLoc,
                                    bool IsTemplateTypeArg);

/// \brief Describes the result of the name lookup and resolution performed
/// by \c ClassifyName().
enum NameClassificationKind {
  NC_Unknown,
  NC_Error,
  NC_Keyword,
  NC_Type,
  NC_Expression,
  NC_NestedNameSpecifier,
  NC_TypeTemplate,
  NC_VarTemplate,
  NC_FunctionTemplate
};

class NameClassification {
  NameClassificationKind Kind;
  ExprResult Expr;
  TemplateName Template;
  ParsedType Type;

  explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}

public:
  NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}

  NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}

  NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}

  static NameClassification Error() {
    return NameClassification(NC_Error);
  }

  static NameClassification Unknown() {
    return NameClassification(NC_Unknown);
  }

  static NameClassification NestedNameSpecifier() {
    return NameClassification(NC_NestedNameSpecifier);
  }

  static NameClassification TypeTemplate(TemplateName Name) {
    NameClassification Result(NC_TypeTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification VarTemplate(TemplateName Name) {
    NameClassification Result(NC_VarTemplate);
    Result.Template = Name;
    return Result;
  }

  static NameClassification FunctionTemplate(TemplateName Name) {
    NameClassification Result(NC_FunctionTemplate);
    Result.Template = Name;
    return Result;
  }

  NameClassificationKind getKind() const { return Kind; }

  ParsedType getType() const {
    assert(Kind == NC_Type)(static_cast <bool> (Kind == NC_Type) ? void (0) : __assert_fail
 ("Kind == NC_Type", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1772, __extension__ __PRETTY_FUNCTION__));
    return Type;
  }

  ExprResult getExpression() const {
    assert(Kind == NC_Expression)(static_cast <bool> (Kind == NC_Expression) ? void (0) :
 __assert_fail ("Kind == NC_Expression", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1777, __extension__ __PRETTY_FUNCTION__));
    return Expr;
  }

  TemplateName getTemplateName() const {
    assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||(static_cast <bool> (Kind == NC_TypeTemplate || Kind ==
 NC_FunctionTemplate || Kind == NC_VarTemplate) ? void (0) : __assert_fail
 ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1783, __extension__ __PRETTY_FUNCTION__))
           Kind == NC_VarTemplate)(static_cast <bool> (Kind == NC_TypeTemplate || Kind ==
 NC_FunctionTemplate || Kind == NC_VarTemplate) ? void (0) : __assert_fail
 ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1783, __extension__ __PRETTY_FUNCTION__));
    return Template;
  }

  TemplateNameKind getTemplateNameKind() const {
    switch (Kind) {
    case NC_TypeTemplate:
      return TNK_Type_template;
    case NC_FunctionTemplate:
      return TNK_Function_template;
    case NC_VarTemplate:
      return TNK_Var_template;
    default:
      llvm_unreachable("unsupported name classification.")::llvm::llvm_unreachable_internal("unsupported name classification."
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 1796);
    }
  }
};

/// \brief Perform name lookup on the given name, classifying it based on
/// the results of name lookup and the following token.
///
/// This routine is used by the parser to resolve identifiers and help direct
/// parsing. When the identifier cannot be found, this routine will attempt
/// to correct the typo and classify based on the resulting name.
///
/// \param S The scope in which we're performing name lookup.
///
/// \param SS The nested-name-specifier that precedes the name.
///
/// \param Name The identifier. If typo correction finds an alternative name,
/// this pointer parameter will be updated accordingly.
///
/// \param NameLoc The location of the identifier.
///
/// \param NextToken The token following the identifier. Used to help
/// disambiguate the name.
///
/// \param IsAddressOfOperand True if this name is the operand of a unary
///        address of ('&') expression, assuming it is classified as an
///        expression.
///
/// \param CCC The correction callback, if typo correction is desired.
NameClassification
ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name,
             SourceLocation NameLoc, const Token &NextToken,
             bool IsAddressOfOperand,
             std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr);

/// Describes the detailed kind of a template name. Used in diagnostics.
enum class TemplateNameKindForDiagnostics {
  ClassTemplate,
  FunctionTemplate,
  VarTemplate,
  AliasTemplate,
  TemplateTemplateParam,
  DependentTemplate
};
TemplateNameKindForDiagnostics
getTemplateNameKindForDiagnostics(TemplateName Name);

/// Determine whether it's plausible that E was intended to be a
/// template-name.
bool mightBeIntendedToBeTemplateName(ExprResult E) {
  if (!getLangOpts().CPlusPlus || E.isInvalid())
    return false;
  if (auto *DRE = dyn_cast<DeclRefExpr>(E.get()))
    return !DRE->hasExplicitTemplateArgs();
  if (auto *ME = dyn_cast<MemberExpr>(E.get()))
    return !ME->hasExplicitTemplateArgs();
  // Any additional cases recognized here should also be handled by
  // diagnoseExprIntendedAsTemplateName.
  return false;
}
void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
                                        SourceLocation Less,
                                        SourceLocation Greater);

Decl *ActOnDeclarator(Scope *S, Declarator &D);

NamedDecl *HandleDeclarator(Scope *S, Declarator &D,
                            MultiTemplateParamsArg TemplateParameterLists);
void RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S);
bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
                                  DeclarationName Name,
                                  SourceLocation Loc);
void
diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
                          SourceLocation FallbackLoc,
                          SourceLocation ConstQualLoc = SourceLocation(),
                          SourceLocation VolatileQualLoc = SourceLocation(),
                          SourceLocation RestrictQualLoc = SourceLocation(),
                          SourceLocation AtomicQualLoc = SourceLocation(),
                          SourceLocation UnalignedQualLoc = SourceLocation());

static bool adjustContextForLocalExternDecl(DeclContext *&DC);
void DiagnoseFunctionSpecifiers(const DeclSpec &DS);
NamedDecl *getShadowedDeclaration(const TypedefNameDecl *D,
                                  const LookupResult &R);
NamedDecl *getShadowedDeclaration(const VarDecl *D, const LookupResult &R);
void CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl,
                 const LookupResult &R);
void CheckShadow(Scope *S, VarDecl *D);

/// Warn if 'E', which is an expression that is about to be modified, refers
/// to a shadowing declaration.
void CheckShadowingDeclModification(Expr *E, SourceLocation Loc);

void DiagnoseShadowingLambdaDecls(const sema::LambdaScopeInfo *LSI);

1893private:
/// Map of current shadowing declarations to shadowed declarations. Warn if
/// it looks like the user is trying to modify the shadowing declaration.
llvm::DenseMap<const NamedDecl *, const NamedDecl *> ShadowingDecls;

1898public:
void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
void handleTagNumbering(const TagDecl *Tag, Scope *TagScope);
void setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
                                  TypedefNameDecl *NewTD);
void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                  TypeSourceInfo *TInfo,
                                  LookupResult &Previous);
NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
                                LookupResult &Previous, bool &Redeclaration);
NamedDecl *ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope,
                                   ArrayRef<BindingDecl *> Bindings = None);
NamedDecl *
ActOnDecompositionDeclarator(Scope *S, Declarator &D,
                             MultiTemplateParamsArg TemplateParamLists);
// Returns true if the variable declaration is a redeclaration
bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
void CheckVariableDeclarationType(VarDecl *NewVD);
bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
                                   Expr *Init);
void CheckCompleteVariableDeclaration(VarDecl *VD);
void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);

NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
                                   TypeSourceInfo *TInfo,
                                   LookupResult &Previous,
                                   MultiTemplateParamsArg TemplateParamLists,
                                   bool &AddToScope);
bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);

bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);

void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD);
void FindHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
void NoteHiddenVirtualMethods(CXXMethodDecl *MD,
                        SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
// Returns true if the function declaration is a redeclaration
bool CheckFunctionDeclaration(Scope *S,
                              FunctionDecl *NewFD, LookupResult &Previous,
                              bool IsMemberSpecialization);
bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
void CheckMain(FunctionDecl *FD, const DeclSpec &D);
void CheckMSVCRTEntryPoint(FunctionDecl *FD);
Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
                                        SourceLocation Loc,
                                        QualType T);
ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
                            SourceLocation NameLoc, IdentifierInfo *Name,
                            QualType T, TypeSourceInfo *TSInfo,
                            StorageClass SC);
void ActOnParamDefaultArgument(Decl *param,
                               SourceLocation EqualLoc,
                               Expr *defarg);
void ActOnParamUnparsedDefaultArgument(Decl *param,
                                       SourceLocation EqualLoc,
                                       SourceLocation ArgLoc);
void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc);
bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
                             SourceLocation EqualLoc);

void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit);
void ActOnUninitializedDecl(Decl *dcl);
void ActOnInitializerError(Decl *Dcl);

void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc);
void ActOnCXXForRangeDecl(Decl *D);
StmtResult ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
                                      IdentifierInfo *Ident,
                                      ParsedAttributes &Attrs,
                                      SourceLocation AttrEnd);
void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
void FinalizeDeclaration(Decl *D);
DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
                                       ArrayRef<Decl *> Group);
DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef<Decl *> Group);

/// Should be called on all declarations that might have attached
/// documentation comments.
void ActOnDocumentableDecl(Decl *D);
void ActOnDocumentableDecls(ArrayRef<Decl *> Group);

void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
                                     SourceLocation LocAfterDecls);
void CheckForFunctionRedefinition(
    FunctionDecl *FD, const FunctionDecl *EffectiveDefinition = nullptr,
    SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D,
                              MultiTemplateParamsArg TemplateParamLists,
                              SkipBodyInfo *SkipBody = nullptr);
Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D,
                              SkipBodyInfo *SkipBody = nullptr);
void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
bool isObjCMethodDecl(Decl *D) {
  return D && isa<ObjCMethodDecl>(D);
}

/// \brief Determine whether we can delay parsing the body of a function or
/// function template until it is used, assuming we don't care about emitting
/// code for that function.
///
/// This will be \c false if we may need the body of the function in the
/// middle of parsing an expression (where it's impractical to switch to
/// parsing a different function), for instance, if it's constexpr in C++11
/// or has an 'auto' return type in C++14. These cases are essentially bugs.
bool canDelayFunctionBody(const Declarator &D);

/// \brief Determine whether we can skip parsing the body of a function
/// definition, assuming we don't care about analyzing its body or emitting
/// code for that function.
///
/// This will be \c false only if we may need the body of the function in
/// order to parse the rest of the program (for instance, if it is
/// \c constexpr in C++11 or has an 'auto' return type in C++14).
bool canSkipFunctionBody(Decl *D);

void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
Decl *ActOnSkippedFunctionBody(Decl *Decl);
void ActOnFinishInlineFunctionDef(FunctionDecl *D);

/// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
/// attribute for which parsing is delayed.
void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);

/// \brief Diagnose any unused parameters in the given sequence of
/// ParmVarDecl pointers.
void DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters);

/// \brief Diagnose whether the size of parameters or return value of a
/// function or obj-c method definition is pass-by-value and larger than a
/// specified threshold.
void
DiagnoseSizeOfParametersAndReturnValue(ArrayRef<ParmVarDecl *> Parameters,
                                       QualType ReturnTy, NamedDecl *D);

void DiagnoseInvalidJumps(Stmt *Body);
Decl *ActOnFileScopeAsmDecl(Expr *expr,
                            SourceLocation AsmLoc,
                            SourceLocation RParenLoc);

/// \brief Handle a C++11 empty-declaration and attribute-declaration.
Decl *ActOnEmptyDeclaration(Scope *S,
                            AttributeList *AttrList,
                            SourceLocation SemiLoc);

enum class ModuleDeclKind {
  Interface,      ///< 'export module X;'
  Implementation, ///< 'module X;'
  Partition,      ///< 'module partition X;'
};

/// The parser has processed a module-declaration that begins the definition
/// of a module interface or implementation.
DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc,
                               SourceLocation ModuleLoc, ModuleDeclKind MDK,
                               ModuleIdPath Path);

/// \brief The parser has processed a module import declaration.
///
/// \param AtLoc The location of the '@' symbol, if any.
///
/// \param ImportLoc The location of the 'import' keyword.
///
/// \param Path The module access path.
DeclResult ActOnModuleImport(SourceLocation AtLoc, SourceLocation ImportLoc,
                             ModuleIdPath Path);

/// \brief The parser has processed a module import translated from a
/// #include or similar preprocessing directive.
void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
void BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod);

/// \brief The parsed has entered a submodule.
void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod);
/// \brief The parser has left a submodule.
void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod);

/// \brief Create an implicit import of the given module at the given
/// source location, for error recovery, if possible.
///
/// This routine is typically used when an entity found by name lookup
/// is actually hidden within a module that we know about but the user
/// has forgotten to import.
void createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
                                                Module *Mod);

/// Kinds of missing import. Note, the values of these enumerators correspond
/// to %select values in diagnostics.
enum class MissingImportKind {
  Declaration,
  Definition,
  DefaultArgument,
  ExplicitSpecialization,
  PartialSpecialization
};

/// \brief Diagnose that the specified declaration needs to be visible but
/// isn't, and suggest a module import that would resolve the problem.
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           MissingImportKind MIK, bool Recover = true);
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
                           SourceLocation DeclLoc, ArrayRef<Module *> Modules,
                           MissingImportKind MIK, bool Recover);

Decl *ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
                           SourceLocation LBraceLoc);
Decl *ActOnFinishExportDecl(Scope *S, Decl *ExportDecl,
                            SourceLocation RBraceLoc);

/// \brief We've found a use of a templated declaration that would trigger an
/// implicit instantiation. Check that any relevant explicit specializations
/// and partial specializations are visible, and diagnose if not.
void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);

/// \brief We've found a use of a template specialization that would select a
/// partial specialization. Check that the partial specialization is visible,
/// and diagnose if not.
void checkPartialSpecializationVisibility(SourceLocation Loc,
                                          NamedDecl *Spec);

/// \brief Retrieve a suitable printing policy.
PrintingPolicy getPrintingPolicy() const {
  return getPrintingPolicy(Context, PP);
}

/// \brief Retrieve a suitable printing policy.
static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
                                        const Preprocessor &PP);

/// Scope actions.
void ActOnPopScope(SourceLocation Loc, Scope *S);
void ActOnTranslationUnitScope(Scope *S);

Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 RecordDecl *&AnonRecord);
Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
                                 MultiTemplateParamsArg TemplateParams,
                                 bool IsExplicitInstantiation,
                                 RecordDecl *&AnonRecord);

Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
                                  AccessSpecifier AS,
                                  RecordDecl *Record,
                                  const PrintingPolicy &Policy);

Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
                                     RecordDecl *Record);

/// Common ways to introduce type names without a tag for use in diagnostics.
/// Keep in sync with err_tag_reference_non_tag.
enum NonTagKind {
  NTK_NonStruct,
  NTK_NonClass,
  NTK_NonUnion,
  NTK_NonEnum,
  NTK_Typedef,
  NTK_TypeAlias,
  NTK_Template,
  NTK_TypeAliasTemplate,
  NTK_TemplateTemplateArgument,
};

/// Given a non-tag type declaration, returns an enum useful for indicating
/// what kind of non-tag type this is.
NonTagKind getNonTagTypeDeclKind(const Decl *D, TagTypeKind TTK);

bool isAcceptableTagRedeclaration(const TagDecl *Previous,
                                  TagTypeKind NewTag, bool isDefinition,
                                  SourceLocation NewTagLoc,
                                  const IdentifierInfo *Name);

enum TagUseKind {
  TUK_Reference,   // Reference to a tag:  'struct foo *X;'
  TUK_Declaration, // Fwd decl of a tag:   'struct foo;'
  TUK_Definition,  // Definition of a tag: 'struct foo { int X; } Y;'
  TUK_Friend       // Friend declaration:  'friend struct foo;'
};

Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
               SourceLocation KWLoc, CXXScopeSpec &SS, IdentifierInfo *Name,
               SourceLocation NameLoc, AttributeList *Attr,
               AccessSpecifier AS, SourceLocation ModulePrivateLoc,
               MultiTemplateParamsArg TemplateParameterLists, bool &OwnedDecl,
               bool &IsDependent, SourceLocation ScopedEnumKWLoc,
               bool ScopedEnumUsesClassTag, TypeResult UnderlyingType,
               bool IsTypeSpecifier, bool IsTemplateParamOrArg,
               SkipBodyInfo *SkipBody = nullptr);

Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
                              unsigned TagSpec, SourceLocation TagLoc,
                              CXXScopeSpec &SS,
                              IdentifierInfo *Name, SourceLocation NameLoc,
                              AttributeList *Attr,
                              MultiTemplateParamsArg TempParamLists);

TypeResult ActOnDependentTag(Scope *S,
                             unsigned TagSpec,
                             TagUseKind TUK,
                             const CXXScopeSpec &SS,
                             IdentifierInfo *Name,
                             SourceLocation TagLoc,
                             SourceLocation NameLoc);

void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
               IdentifierInfo *ClassName,
               SmallVectorImpl<Decl *> &Decls);
Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
                 Declarator &D, Expr *BitfieldWidth);

FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
                       Declarator &D, Expr *BitfieldWidth,
                       InClassInitStyle InitStyle,
                       AccessSpecifier AS);
MSPropertyDecl *HandleMSProperty(Scope *S, RecordDecl *TagD,
                                 SourceLocation DeclStart,
                                 Declarator &D, Expr *BitfieldWidth,
                                 InClassInitStyle InitStyle,
                                 AccessSpecifier AS,
                                 AttributeList *MSPropertyAttr);

FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
                          TypeSourceInfo *TInfo,
                          RecordDecl *Record, SourceLocation Loc,
                          bool Mutable, Expr *BitfieldWidth,
                          InClassInitStyle InitStyle,
                          SourceLocation TSSL,
                          AccessSpecifier AS, NamedDecl *PrevDecl,
                          Declarator *D = nullptr);

bool CheckNontrivialField(FieldDecl *FD);
void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM);

enum TrivialABIHandling {
  /// The triviality of a method unaffected by "trivial_abi".
  TAH_IgnoreTrivialABI,

  /// The triviality of a method affected by "trivial_abi".
  TAH_ConsiderTrivialABI
};

bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
                            TrivialABIHandling TAH = TAH_IgnoreTrivialABI,
                            bool Diagnose = false);
CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
void ActOnLastBitfield(SourceLocation DeclStart,
                       SmallVectorImpl<Decl *> &AllIvarDecls);
Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
                Declarator &D, Expr *BitfieldWidth,
                tok::ObjCKeywordKind visibility);

// This is used for both record definitions and ObjC interface declarations.
void ActOnFields(Scope* S, SourceLocation RecLoc, Decl *TagDecl,
                 ArrayRef<Decl *> Fields,
                 SourceLocation LBrac, SourceLocation RBrac,
                 AttributeList *AttrList);

/// ActOnTagStartDefinition - Invoked when we have entered the
/// scope of a tag's definition (e.g., for an enumeration, class,
/// struct, or union).
void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);

/// Perform ODR-like check for C/ObjC when merging tag types from modules.
/// Differently from C++, actually parse the body and reject / error out
/// in case of a structural mismatch.
bool ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev,
                              SkipBodyInfo &SkipBody);

typedef void *SkippedDefinitionContext;

/// \brief Invoked when we enter a tag definition that we're skipping.
SkippedDefinitionContext ActOnTagStartSkippedDefinition(Scope *S, Decl *TD);

Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);

/// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
/// C++ record definition's base-specifiers clause and are starting its
/// member declarations.
void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
                                     SourceLocation FinalLoc,
                                     bool IsFinalSpelledSealed,
                                     SourceLocation LBraceLoc);

/// ActOnTagFinishDefinition - Invoked once we have finished parsing
/// the definition of a tag (enumeration, class, struct, or union).
void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
                              SourceRange BraceRange);

void ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context);

void ActOnObjCContainerFinishDefinition();

/// \brief Invoked when we must temporarily exit the objective-c container
/// scope for parsing/looking-up C constructs.
///
/// Must be followed by a call to \see ActOnObjCReenterContainerContext
void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
void ActOnObjCReenterContainerContext(DeclContext *DC);

/// ActOnTagDefinitionError - Invoked when there was an unrecoverable
/// error parsing the definition of a tag.
void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);

EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
                                    EnumConstantDecl *LastEnumConst,
                                    SourceLocation IdLoc,
                                    IdentifierInfo *Id,
                                    Expr *val);
bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
                            QualType EnumUnderlyingTy, bool IsFixed,
                            const EnumDecl *Prev);

/// Determine whether the body of an anonymous enumeration should be skipped.
/// \param II The name of the first enumerator.
SkipBodyInfo shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
                                    SourceLocation IILoc);

Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
                        SourceLocation IdLoc, IdentifierInfo *Id,
                        AttributeList *Attrs, SourceLocation EqualLoc,
                        Expr *Val);
void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
                   Decl *EnumDecl,
                   ArrayRef<Decl *> Elements,
                   Scope *S, AttributeList *Attr);

DeclContext *getContainingDC(DeclContext *DC);

/// Set the current declaration context until it gets popped.
void PushDeclContext(Scope *S, DeclContext *DC);
void PopDeclContext();

/// EnterDeclaratorContext - Used when we must lookup names in the context
/// of a declarator's nested name specifier.
void EnterDeclaratorContext(Scope *S, DeclContext *DC);
void ExitDeclaratorContext(Scope *S);

/// Push the parameters of D, which must be a function, into scope.
void ActOnReenterFunctionContext(Scope* S, Decl* D);
void ActOnExitFunctionContext();

DeclContext *getFunctionLevelDeclContext();

/// getCurFunctionDecl - If inside of a function body, this returns a pointer
/// to the function decl for the function being parsed.  If we're currently
/// in a 'block', this returns the containing context.
FunctionDecl *getCurFunctionDecl();

/// getCurMethodDecl - If inside of a method body, this returns a pointer to
/// the method decl for the method being parsed.  If we're currently
/// in a 'block', this returns the containing context.
ObjCMethodDecl *getCurMethodDecl();

/// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
/// or C function we're in, otherwise return null.  If we're currently
/// in a 'block', this returns the containing context.
NamedDecl *getCurFunctionOrMethodDecl();

/// Add this decl to the scope shadowed decl chains.
void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);

/// \brief Make the given externally-produced declaration visible at the
/// top level scope.
///
/// \param D The externally-produced declaration to push.
///
/// \param Name The name of the externally-produced declaration.
void pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name);

/// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
/// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
/// true if 'D' belongs to the given declaration context.
///
/// \param AllowInlineNamespace If \c true, allow the declaration to be in the
///        enclosing namespace set of the context, rather than contained
///        directly within it.
bool isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S = nullptr,
                   bool AllowInlineNamespace = false);

/// Finds the scope corresponding to the given decl context, if it
/// happens to be an enclosing scope.  Otherwise return NULL.
static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);

/// Subroutines of ActOnDeclarator().
TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
                              TypeSourceInfo *TInfo);
bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);

/// \brief Describes the kind of merge to perform for availability
/// attributes (including "deprecated", "unavailable", and "availability").
enum AvailabilityMergeKind {
  /// \brief Don't merge availability attributes at all.
  AMK_None,
  /// \brief Merge availability attributes for a redeclaration, which requires
  /// an exact match.
  AMK_Redeclaration,
  /// \brief Merge availability attributes for an override, which requires
  /// an exact match or a weakening of constraints.
  AMK_Override,
  /// \brief Merge availability attributes for an implementation of
  /// a protocol requirement.
  AMK_ProtocolImplementation,
};

/// Attribute merging methods. Return true if a new attribute was added.
AvailabilityAttr *mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
                                        IdentifierInfo *Platform,
                                        bool Implicit,
                                        VersionTuple Introduced,
                                        VersionTuple Deprecated,
                                        VersionTuple Obsoleted,
                                        bool IsUnavailable,
                                        StringRef Message,
                                        bool IsStrict, StringRef Replacement,
                                        AvailabilityMergeKind AMK,
                                        unsigned AttrSpellingListIndex);
TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
                                     TypeVisibilityAttr::VisibilityType Vis,
                                            unsigned AttrSpellingListIndex);
VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
                                    VisibilityAttr::VisibilityType Vis,
                                    unsigned AttrSpellingListIndex);
UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
                        unsigned AttrSpellingListIndex, StringRef Uuid);
DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
                                  unsigned AttrSpellingListIndex);
MSInheritanceAttr *
mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
                       unsigned AttrSpellingListIndex,
                       MSInheritanceAttr::Spelling SemanticSpelling);
FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
                            IdentifierInfo *Format, int FormatIdx,
                            int FirstArg, unsigned AttrSpellingListIndex);
SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
                              unsigned AttrSpellingListIndex);
AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
                                        IdentifierInfo *Ident,
                                        unsigned AttrSpellingListIndex);
MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
                              unsigned AttrSpellingListIndex);
OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
                                        unsigned AttrSpellingListIndex);
InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, SourceRange Range,
                                              IdentifierInfo *Ident,
                                              unsigned AttrSpellingListIndex);
CommonAttr *mergeCommonAttr(Decl *D, SourceRange Range, IdentifierInfo *Ident,
                            unsigned AttrSpellingListIndex);

void mergeDeclAttributes(NamedDecl *New, Decl *Old,
                         AvailabilityMergeKind AMK = AMK_Redeclaration);
void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
                          LookupResult &OldDecls);
bool MergeFunctionDecl(FunctionDecl *New, NamedDecl *&Old, Scope *S,
                       bool MergeTypeWithOld);
bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
                                  Scope *S, bool MergeTypeWithOld);
void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
void MergeVarDecl(VarDecl *New, LookupResult &Previous);
void MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool MergeTypeWithOld);
void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
bool checkVarDeclRedefinition(VarDecl *OldDefn, VarDecl *NewDefn);
void notePreviousDefinition(const NamedDecl *Old, SourceLocation New);
bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);

// AssignmentAction - This is used by all the assignment diagnostic functions
// to represent what is actually causing the operation
enum AssignmentAction {
  AA_Assigning,
  AA_Passing,
  AA_Returning,
  AA_Converting,
  AA_Initializing,
  AA_Sending,
  AA_Casting,
  AA_Passing_CFAudited
};

/// C++ Overloading.
enum OverloadKind {
  /// This is a legitimate overload: the existing declarations are
  /// functions or function templates with different signatures.
  Ovl_Overload,

  /// This is not an overload because the signature exactly matches
  /// an existing declaration.
  Ovl_Match,

  /// This is not an overload because the lookup results contain a
  /// non-function.
  Ovl_NonFunction
};
OverloadKind CheckOverload(Scope *S,
                           FunctionDecl *New,
                           const LookupResult &OldDecls,
                           NamedDecl *&OldDecl,
                           bool IsForUsingDecl);
bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl,
                bool ConsiderCudaAttrs = true);

/// \brief Checks availability of the function depending on the current
/// function context.Inside an unavailable function,unavailability is ignored.
///
/// \returns true if \p FD is unavailable and current context is inside
/// an available function, false otherwise.
bool isFunctionConsideredUnavailable(FunctionDecl *FD);

ImplicitConversionSequence
TryImplicitConversion(Expr *From, QualType ToType,
                      bool SuppressUserConversions,
                      bool AllowExplicit,
                      bool InOverloadResolution,
                      bool CStyle,
                      bool AllowObjCWritebackConversion);

bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
bool IsComplexPromotion(QualType FromType, QualType ToType);
bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
                         bool InOverloadResolution,
                         QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCPointerConversion(QualType FromType, QualType ToType,
                             QualType& ConvertedType, bool &IncompatibleObjC);
bool isObjCWritebackConversion(QualType FromType, QualType ToType,
                               QualType &ConvertedType);
bool IsBlockPointerConversion(QualType FromType, QualType ToType,
                              QualType& ConvertedType);
bool FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
                                const FunctionProtoType *NewType,
                                unsigned *ArgPos = nullptr);
void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
                                QualType FromType, QualType ToType);

void maybeExtendBlockObject(ExprResult &E);
CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
bool CheckPointerConversion(Expr *From, QualType ToType,
                            CastKind &Kind,
                            CXXCastPath& BasePath,
                            bool IgnoreBaseAccess,
                            bool Diagnose = true);
bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
                               bool InOverloadResolution,
                               QualType &ConvertedType);
bool CheckMemberPointerConversion(Expr *From, QualType ToType,
                                  CastKind &Kind,
                                  CXXCastPath &BasePath,
                                  bool IgnoreBaseAccess);
bool IsQualificationConversion(QualType FromType, QualType ToType,
                               bool CStyle, bool &ObjCLifetimeConversion);
bool IsFunctionConversion(QualType FromType, QualType ToType,
                          QualType &ResultTy);
bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
bool isSameOrCompatibleFunctionType(CanQualType Param, CanQualType Arg);

ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
                                           const VarDecl *NRVOCandidate,
                                           QualType ResultType,
                                           Expr *Value,
                                           bool AllowNRVO = true);

bool CanPerformCopyInitialization(const InitializedEntity &Entity,
                                  ExprResult Init);
ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
                                     SourceLocation EqualLoc,
                                     ExprResult Init,
                                     bool TopLevelOfInitList = false,
                                     bool AllowExplicit = false);
ExprResult PerformObjectArgumentInitialization(Expr *From,
                                               NestedNameSpecifier *Qualifier,
                                               NamedDecl *FoundDecl,
                                               CXXMethodDecl *Method);

ExprResult PerformContextuallyConvertToBool(Expr *From);
ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);

/// Contexts in which a converted constant expression is required.
enum CCEKind {
  CCEK_CaseValue,   ///< Expression in a case label.
  CCEK_Enumerator,  ///< Enumerator value with fixed underlying type.
  CCEK_TemplateArg, ///< Value of a non-type template parameter.
  CCEK_NewExpr,     ///< Constant expression in a noptr-new-declarator.
  CCEK_ConstexprIf  ///< Condition in a constexpr if statement.
};
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            llvm::APSInt &Value, CCEKind CCE);
ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
                                            APValue &Value, CCEKind CCE);

/// \brief Abstract base class used to perform a contextual implicit
/// conversion from an expression to any type passing a filter.
class ContextualImplicitConverter {
public:
  bool Suppress;
  bool SuppressConversion;

  ContextualImplicitConverter(bool Suppress = false,
                              bool SuppressConversion = false)
      : Suppress(Suppress), SuppressConversion(SuppressConversion) {}

  /// \brief Determine whether the specified type is a valid destination type
  /// for this conversion.
  virtual bool match(QualType T) = 0;

  /// \brief Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a diagnostic when the expression has incomplete class type.
  virtual SemaDiagnosticBuilder
  diagnoseIncomplete(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a diagnostic when the only matching conversion function
  /// is explicit.
  virtual SemaDiagnosticBuilder diagnoseExplicitConv(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  /// \brief Emits a note for the explicit conversion function.
  virtual SemaDiagnosticBuilder
  noteExplicitConv(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// \brief Emits a diagnostic when there are multiple possible conversion
  /// functions.
  virtual SemaDiagnosticBuilder
  diagnoseAmbiguous(Sema &S, SourceLocation Loc, QualType T) = 0;

  /// \brief Emits a note for one of the candidate conversions.
  virtual SemaDiagnosticBuilder
  noteAmbiguous(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;

  /// \brief Emits a diagnostic when we picked a conversion function
  /// (for cases when we are not allowed to pick a conversion function).
  virtual SemaDiagnosticBuilder diagnoseConversion(
      Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;

  virtual ~ContextualImplicitConverter() {}
};

class ICEConvertDiagnoser : public ContextualImplicitConverter {
  bool AllowScopedEnumerations;

public:
  ICEConvertDiagnoser(bool AllowScopedEnumerations,
                      bool Suppress, bool SuppressConversion)
      : ContextualImplicitConverter(Suppress, SuppressConversion),
        AllowScopedEnumerations(AllowScopedEnumerations) {}

  /// Match an integral or (possibly scoped) enumeration type.
  bool match(QualType T) override;

  SemaDiagnosticBuilder
  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) override {
    return diagnoseNotInt(S, Loc, T);
  }

  /// \brief Emits a diagnostic complaining that the expression does not have
  /// integral or enumeration type.
  virtual SemaDiagnosticBuilder
  diagnoseNotInt(Sema &S, SourceLocation Loc, QualType T) = 0;
};

/// Perform a contextual implicit conversion.
ExprResult PerformContextualImplicitConversion(
    SourceLocation Loc, Expr *FromE, ContextualImplicitConverter &Converter);


enum ObjCSubscriptKind {
  OS_Array,
  OS_Dictionary,
  OS_Error
};
ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);

// Note that LK_String is intentionally after the other literals, as
// this is used for diagnostics logic.
enum ObjCLiteralKind {
  LK_Array,
  LK_Dictionary,
  LK_Numeric,
  LK_Boxed,
  LK_String,
  LK_Block,
  LK_None
};
ObjCLiteralKind CheckLiteralKind(Expr *FromE);

ExprResult PerformObjectMemberConversion(Expr *From,
                                         NestedNameSpecifier *Qualifier,
                                         NamedDecl *FoundDecl,
                                         NamedDecl *Member);

// Members have to be NamespaceDecl* or TranslationUnitDecl*.
// TODO: make this is a typesafe union.
typedef llvm::SmallSetVector<DeclContext   *, 16> AssociatedNamespaceSet;
typedef llvm::SmallSetVector<CXXRecordDecl *, 16> AssociatedClassSet;

void AddOverloadCandidate(FunctionDecl *Function,
                          DeclAccessPair FoundDecl,
                          ArrayRef<Expr *> Args,
                          OverloadCandidateSet &CandidateSet,
                          bool SuppressUserConversions = false,
                          bool PartialOverloading = false,
                          bool AllowExplicit = false,
                          ConversionSequenceList EarlyConversions = None);
void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
                    ArrayRef<Expr *> Args,
                    OverloadCandidateSet &CandidateSet,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    bool SuppressUserConversions = false,
                    bool PartialOverloading = false,
                    bool FirstArgumentIsBase = false);
void AddMethodCandidate(DeclAccessPair FoundDecl,
                        QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversion = false);
void AddMethodCandidate(CXXMethodDecl *Method,
                        DeclAccessPair FoundDecl,
                        CXXRecordDecl *ActingContext, QualType ObjectType,
                        Expr::Classification ObjectClassification,
                        ArrayRef<Expr *> Args,
                        OverloadCandidateSet& CandidateSet,
                        bool SuppressUserConversions = false,
                        bool PartialOverloading = false,
                        ConversionSequenceList EarlyConversions = None);
void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
                                DeclAccessPair FoundDecl,
                                CXXRecordDecl *ActingContext,
                               TemplateArgumentListInfo *ExplicitTemplateArgs,
                                QualType ObjectType,
                                Expr::Classification ObjectClassification,
                                ArrayRef<Expr *> Args,
                                OverloadCandidateSet& CandidateSet,
                                bool SuppressUserConversions = false,
                                bool PartialOverloading = false);
void AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
                                  DeclAccessPair FoundDecl,
                               TemplateArgumentListInfo *ExplicitTemplateArgs,
                                  ArrayRef<Expr *> Args,
                                  OverloadCandidateSet& CandidateSet,
                                  bool SuppressUserConversions = false,
                                  bool PartialOverloading = false);
bool CheckNonDependentConversions(FunctionTemplateDecl *FunctionTemplate,
                                  ArrayRef<QualType> ParamTypes,
                                  ArrayRef<Expr *> Args,
                                  OverloadCandidateSet &CandidateSet,
                                  ConversionSequenceList &Conversions,
                                  bool SuppressUserConversions,
                                  CXXRecordDecl *ActingContext = nullptr,
                                  QualType ObjectType = QualType(),
                                  Expr::Classification
                                      ObjectClassification = {});
void AddConversionCandidate(CXXConversionDecl *Conversion,
                            DeclAccessPair FoundDecl,
                            CXXRecordDecl *ActingContext,
                            Expr *From, QualType ToType,
                            OverloadCandidateSet& CandidateSet,
                            bool AllowObjCConversionOnExplicit,
                            bool AllowResultConversion = true);
void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
                                    DeclAccessPair FoundDecl,
                                    CXXRecordDecl *ActingContext,
                                    Expr *From, QualType ToType,
                                    OverloadCandidateSet &CandidateSet,
                                    bool AllowObjCConversionOnExplicit,
                                    bool AllowResultConversion = true);
void AddSurrogateCandidate(CXXConversionDecl *Conversion,
                           DeclAccessPair FoundDecl,
                           CXXRecordDecl *ActingContext,
                           const FunctionProtoType *Proto,
                           Expr *Object, ArrayRef<Expr *> Args,
                           OverloadCandidateSet& CandidateSet);
void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
                                 SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                 OverloadCandidateSet& CandidateSet,
                                 SourceRange OpRange = SourceRange());
void AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args,
                         OverloadCandidateSet& CandidateSet,
                         bool IsAssignmentOperator = false,
                         unsigned NumContextualBoolArguments = 0);
void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
                                  SourceLocation OpLoc, ArrayRef<Expr *> Args,
                                  OverloadCandidateSet& CandidateSet);
void AddArgumentDependentLookupCandidates(DeclarationName Name,
                                          SourceLocation Loc,
                                          ArrayRef<Expr *> Args,
                              TemplateArgumentListInfo *ExplicitTemplateArgs,
                                          OverloadCandidateSet& CandidateSet,
                                          bool PartialOverloading = false);

// Emit as a 'note' the specific overload candidate
void NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn,
                           QualType DestType = QualType(),
                           bool TakingAddress = false);

// Emit as a series of 'note's all template and non-templates identified by
// the expression Expr
void NoteAllOverloadCandidates(Expr *E, QualType DestType = QualType(),
                               bool TakingAddress = false);

/// Check the enable_if expressions on the given function. Returns the first
/// failing attribute, or NULL if they were all successful.
EnableIfAttr *CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
                            bool MissingImplicitThis = false);

/// Find the failed Boolean condition within a given Boolean
/// constant expression, and describe it with a string.
///
/// \param AllowTopLevelCond Whether to allow the result to be the
/// complete top-level condition.
std::pair<Expr *, std::string>
findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// non-ArgDependent DiagnoseIfAttrs.
///
/// Argument-dependent diagnose_if attributes should be checked each time a
/// function is used as a direct callee of a function call.
///
/// Returns true if any errors were emitted.
bool diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
                                         const Expr *ThisArg,
                                         ArrayRef<const Expr *> Args,
                                         SourceLocation Loc);

/// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
/// ArgDependent DiagnoseIfAttrs.
///
/// Argument-independent diagnose_if attributes should be checked on every use
/// of a function.
///
/// Returns true if any errors were emitted.
bool diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND,
                                           SourceLocation Loc);

/// Returns whether the given function's address can be taken or not,
/// optionally emitting a diagnostic if the address can't be taken.
///
/// Returns false if taking the address of the function is illegal.
bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function,
                                       bool Complain = false,
                                       SourceLocation Loc = SourceLocation());

// [PossiblyAFunctionType]  -->   [Return]
// NonFunctionType --> NonFunctionType
// R (A) --> R(A)
// R (*)(A) --> R (A)
// R (&)(A) --> R (A)
// R (S::*)(A) --> R (A)
QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);

FunctionDecl *
ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
                                   QualType TargetType,
                                   bool Complain,
                                   DeclAccessPair &Found,
                                   bool *pHadMultipleCandidates = nullptr);

FunctionDecl *
resolveAddressOfOnlyViableOverloadCandidate(Expr *E,
                                            DeclAccessPair &FoundResult);

bool resolveAndFixAddressOfOnlyViableOverloadCandidate(
    ExprResult &SrcExpr, bool DoFunctionPointerConversion = false);

FunctionDecl *
ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
                                            bool Complain = false,
                                            DeclAccessPair *Found = nullptr);

bool ResolveAndFixSingleFunctionTemplateSpecialization(
                    ExprResult &SrcExpr,
                    bool DoFunctionPointerConverion = false,
                    bool Complain = false,
                    SourceRange OpRangeForComplaining = SourceRange(),
                    QualType DestTypeForComplaining = QualType(),
                    unsigned DiagIDForComplaining = 0);


Expr *FixOverloadedFunctionReference(Expr *E,
                                     DeclAccessPair FoundDecl,
                                     FunctionDecl *Fn);
ExprResult FixOverloadedFunctionReference(ExprResult,
                                          DeclAccessPair FoundDecl,
                                          FunctionDecl *Fn);

void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
                                 ArrayRef<Expr *> Args,
                                 OverloadCandidateSet &CandidateSet,
                                 bool PartialOverloading = false);

// An enum used to represent the different possible results of building a
// range-based for loop.
enum ForRangeStatus {
  FRS_Success,
  FRS_NoViableFunction,
  FRS_DiagnosticIssued
};

ForRangeStatus BuildForRangeBeginEndCall(SourceLocation Loc,
                                         SourceLocation RangeLoc,
                                         const DeclarationNameInfo &NameInfo,
                                         LookupResult &MemberLookup,
                                         OverloadCandidateSet *CandidateSet,
                                         Expr *Range, ExprResult *CallExpr);

ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
                                   UnresolvedLookupExpr *ULE,
                                   SourceLocation LParenLoc,
                                   MultiExprArg Args,
                                   SourceLocation RParenLoc,
                                   Expr *ExecConfig,
                                   bool AllowTypoCorrection=true,
                                   bool CalleesAddressIsTaken=false);

bool buildOverloadedCallSet(Scope *S, Expr *Fn, UnresolvedLookupExpr *ULE,
                            MultiExprArg Args, SourceLocation RParenLoc,
                            OverloadCandidateSet *CandidateSet,
                            ExprResult *Result);

ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
                                   UnaryOperatorKind Opc,
                                   const UnresolvedSetImpl &Fns,
                                   Expr *input, bool RequiresADL = true);

ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
                                 BinaryOperatorKind Opc,
                                 const UnresolvedSetImpl &Fns,
                                 Expr *LHS, Expr *RHS,
                                 bool RequiresADL = true);

ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
                                              SourceLocation RLoc,
                                              Expr *Base,Expr *Idx);

ExprResult
BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
                          SourceLocation LParenLoc,
                          MultiExprArg Args,
                          SourceLocation RParenLoc);
ExprResult
BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
                             MultiExprArg Args,
                             SourceLocation RParenLoc);

ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
                                    SourceLocation OpLoc,
                                    bool *NoArrowOperatorFound = nullptr);

/// CheckCallReturnType - Checks that a call expression's return type is
/// complete. Returns true on failure. The location passed in is the location
/// that best represents the call.
bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
                         CallExpr *CE, FunctionDecl *FD);

/// Helpers for dealing with blocks and functions.
bool CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
                              bool CheckParameterNames);
void CheckCXXDefaultArguments(FunctionDecl *FD);
void CheckExtraCXXDefaultArguments(Declarator &D);
Scope *getNonFieldDeclScope(Scope *S);

/// \name Name lookup
///
/// These routines provide name lookup that is used during semantic
/// analysis to resolve the various kinds of names (identifiers,
/// overloaded operator names, constructor names, etc.) into zero or
/// more declarations within a particular scope. The major entry
/// points are LookupName, which performs unqualified name lookup,
/// and LookupQualifiedName, which performs qualified name lookup.
///
/// All name lookup is performed based on some specific criteria,
/// which specify what names will be visible to name lookup and how
/// far name lookup should work. These criteria are important both
/// for capturing language semantics (certain lookups will ignore
/// certain names, for example) and for performance, since name
/// lookup is often a bottleneck in the compilation of C++. Name
/// lookup criteria is specified via the LookupCriteria enumeration.
///
/// The results of name lookup can vary based on the kind of name
/// lookup performed, the current language, and the translation
/// unit. In C, for example, name lookup will either return nothing
/// (no entity found) or a single declaration. In C++, name lookup
/// can additionally refer to a set of overloaded functions or
/// result in an ambiguity. All of the possible results of name
/// lookup are captured by the LookupResult class, which provides
/// the ability to distinguish among them.
//@{

/// @brief Describes the kind of name lookup to perform.
enum LookupNameKind {
  /// Ordinary name lookup, which finds ordinary names (functions,
  /// variables, typedefs, etc.) in C and most kinds of names
  /// (functions, variables, members, types, etc.) in C++.
  LookupOrdinaryName = 0,
  /// Tag name lookup, which finds the names of enums, classes,
  /// structs, and unions.
  LookupTagName,
  /// Label name lookup.
  LookupLabel,
  /// Member name lookup, which finds the names of
  /// class/struct/union members.
  LookupMemberName,
  /// Look up of an operator name (e.g., operator+) for use with
  /// operator overloading. This lookup is similar to ordinary name
  /// lookup, but will ignore any declarations that are class members.
  LookupOperatorName,
  /// Look up of a name that precedes the '::' scope resolution
  /// operator in C++. This lookup completely ignores operator, object,
  /// function, and enumerator names (C++ [basic.lookup.qual]p1).
  LookupNestedNameSpecifierName,
  /// Look up a namespace name within a C++ using directive or
  /// namespace alias definition, ignoring non-namespace names (C++
  /// [basic.lookup.udir]p1).
  LookupNamespaceName,
  /// Look up all declarations in a scope with the given name,
  /// including resolved using declarations.  This is appropriate
  /// for checking redeclarations for a using declaration.
  LookupUsingDeclName,
  /// Look up an ordinary name that is going to be redeclared as a
  /// name with linkage. This lookup ignores any declarations that
  /// are outside of the current scope unless they have linkage. See
  /// C99 6.2.2p4-5 and C++ [basic.link]p6.
  LookupRedeclarationWithLinkage,
  /// Look up a friend of a local class. This lookup does not look
  /// outside the innermost non-class scope. See C++11 [class.friend]p11.
  LookupLocalFriendName,
  /// Look up the name of an Objective-C protocol.
  LookupObjCProtocolName,
  /// Look up implicit 'self' parameter of an objective-c method.
  LookupObjCImplicitSelfParam,
  /// \brief Look up the name of an OpenMP user-defined reduction operation.
  LookupOMPReductionName,
  /// \brief Look up any declaration with any name.
  LookupAnyName
};

/// \brief Specifies whether (or how) name lookup is being performed for a
/// redeclaration (vs. a reference).
enum RedeclarationKind {
  /// \brief The lookup is a reference to this name that is not for the
  /// purpose of redeclaring the name.
  NotForRedeclaration = 0,
  /// \brief The lookup results will be used for redeclaration of a name,
  /// if an entity by that name already exists and is visible.
  ForVisibleRedeclaration,
  /// \brief The lookup results will be used for redeclaration of a name
  /// with external linkage; non-visible lookup results with external linkage
  /// may also be found.
  ForExternalRedeclaration
};

RedeclarationKind forRedeclarationInCurContext() {
  // A declaration with an owning module for linkage can never link against
  // anything that is not visible. We don't need to check linkage here; if
  // the context has internal linkage, redeclaration lookup won't find things
  // from other TUs, and we can't safely compute linkage yet in general.
  if (cast<Decl>(CurContext)
          ->getOwningModuleForLinkage(/*IgnoreLinkage*/true))
    return ForVisibleRedeclaration;
  return ForExternalRedeclaration;
}

/// \brief The possible outcomes of name lookup for a literal operator.
enum LiteralOperatorLookupResult {
  /// \brief The lookup resulted in an error.
  LOLR_Error,
  /// \brief The lookup found no match but no diagnostic was issued.
  LOLR_ErrorNoDiagnostic,
  /// \brief The lookup found a single 'cooked' literal operator, which
  /// expects a normal literal to be built and passed to it.
  LOLR_Cooked,
  /// \brief The lookup found a single 'raw' literal operator, which expects
  /// a string literal containing the spelling of the literal token.
  LOLR_Raw,
  /// \brief The lookup found an overload set of literal operator templates,
  /// which expect the characters of the spelling of the literal token to be
  /// passed as a non-type template argument pack.
  LOLR_Template,
  /// \brief The lookup found an overload set of literal operator templates,
  /// which expect the character type and characters of the spelling of the
  /// string literal token to be passed as template arguments.
  LOLR_StringTemplate
};

SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D,
                                                CXXSpecialMember SM,
                                                bool ConstArg,
                                                bool VolatileArg,
                                                bool RValueThis,
                                                bool ConstThis,
                                                bool VolatileThis);

typedef std::function<void(const TypoCorrection &)> TypoDiagnosticGenerator;
typedef std::function<ExprResult(Sema &, TypoExpr *, TypoCorrection)>
    TypoRecoveryCallback;

3108private:
bool CppLookupName(LookupResult &R, Scope *S);

struct TypoExprState {
  std::unique_ptr<TypoCorrectionConsumer> Consumer;
  TypoDiagnosticGenerator DiagHandler;
  TypoRecoveryCallback RecoveryHandler;
  TypoExprState();
  TypoExprState(TypoExprState &&other) noexcept;
  TypoExprState &operator=(TypoExprState &&other) noexcept;
};

/// \brief The set of unhandled TypoExprs and their associated state.
llvm::MapVector<TypoExpr *, TypoExprState> DelayedTypos;

/// \brief Creates a new TypoExpr AST node.
TypoExpr *createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC,
                            TypoDiagnosticGenerator TDG,
                            TypoRecoveryCallback TRC);

// \brief The set of known/encountered (unique, canonicalized) NamespaceDecls.
//
// The boolean value will be true to indicate that the namespace was loaded
// from an AST/PCH file, or false otherwise.
llvm::MapVector<NamespaceDecl*, bool> KnownNamespaces;

/// \brief Whether we have already loaded known namespaces from an extenal
/// source.
bool LoadedExternalKnownNamespaces;

/// \brief Helper for CorrectTypo and CorrectTypoDelayed used to create and
/// populate a new TypoCorrectionConsumer. Returns nullptr if typo correction
/// should be skipped entirely.
std::unique_ptr<TypoCorrectionConsumer>
makeTypoCorrectionConsumer(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind, Scope *S,
                           CXXScopeSpec *SS,
                           std::unique_ptr<CorrectionCandidateCallback> CCC,
                           DeclContext *MemberContext, bool EnteringContext,
                           const ObjCObjectPointerType *OPT,
                           bool ErrorRecovery);

3150public:
const TypoExprState &getTypoExprState(TypoExpr *TE) const;

/// \brief Clears the state of the given TypoExpr.
void clearDelayedTypo(TypoExpr *TE);

/// \brief Look up a name, looking for a single declaration.  Return
/// null if the results were absent, ambiguous, or overloaded.
///
/// It is preferable to use the elaborated form and explicitly handle
/// ambiguity and overloaded.
NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
                            SourceLocation Loc,
                            LookupNameKind NameKind,
                            RedeclarationKind Redecl
                              = NotForRedeclaration);
bool LookupName(LookupResult &R, Scope *S,
                bool AllowBuiltinCreation = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         bool InUnqualifiedLookup = false);
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                         CXXScopeSpec &SS);
bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
                      bool AllowBuiltinCreation = false,
                      bool EnteringContext = false);
ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
                                 RedeclarationKind Redecl
                                   = NotForRedeclaration);
bool LookupInSuper(LookupResult &R, CXXRecordDecl *Class);

void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
                                  QualType T1, QualType T2,
                                  UnresolvedSetImpl &Functions);

LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
                               SourceLocation GnuLabelLoc = SourceLocation());

DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
                                             unsigned Quals);
CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                       bool RValueThis, unsigned ThisQuals);
CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class,
                                            unsigned Quals);
CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, unsigned Quals,
                                      bool RValueThis, unsigned ThisQuals);
CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);

bool checkLiteralOperatorId(const CXXScopeSpec &SS, const UnqualifiedId &Id);
LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
                                                  ArrayRef<QualType> ArgTys,
                                                  bool AllowRaw,
                                                  bool AllowTemplate,
                                                  bool AllowStringTemplate,
                                                  bool DiagnoseMissing);
bool isKnownName(StringRef name);

void ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc,
                             ArrayRef<Expr *> Args, ADLResult &Functions);

void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool LoadExternal = true);
void LookupVisibleDecls(DeclContext *Ctx, LookupNameKind Kind,
                        VisibleDeclConsumer &Consumer,
                        bool IncludeGlobalScope = true,
                        bool IncludeDependentBases = false,
                        bool LoadExternal = true);

enum CorrectTypoKind {
  CTK_NonError,     // CorrectTypo used in a non error recovery situation.
  CTK_ErrorRecovery // CorrectTypo used in normal error recovery.
};

TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
                           Sema::LookupNameKind LookupKind,
                           Scope *S, CXXScopeSpec *SS,
                           std::unique_ptr<CorrectionCandidateCallback> CCC,
                           CorrectTypoKind Mode,
                           DeclContext *MemberContext = nullptr,
                           bool EnteringContext = false,
                           const ObjCObjectPointerType *OPT = nullptr,
                           bool RecordFailure = true);

TypoExpr *CorrectTypoDelayed(const DeclarationNameInfo &Typo,
                             Sema::LookupNameKind LookupKind, Scope *S,
                             CXXScopeSpec *SS,
                             std::unique_ptr<CorrectionCandidateCallback> CCC,
                             TypoDiagnosticGenerator TDG,
                             TypoRecoveryCallback TRC, CorrectTypoKind Mode,
                             DeclContext *MemberContext = nullptr,
                             bool EnteringContext = false,
                             const ObjCObjectPointerType *OPT = nullptr);

/// \brief Process any TypoExprs in the given Expr and its children,
/// generating diagnostics as appropriate and returning a new Expr if there
/// were typos that were all successfully corrected and ExprError if one or
/// more typos could not be corrected.
///
/// \param E The Expr to check for TypoExprs.
///
/// \param InitDecl A VarDecl to avoid because the Expr being corrected is its
/// initializer.
///
/// \param Filter A function applied to a newly rebuilt Expr to determine if
/// it is an acceptable/usable result from a single combination of typo
/// corrections. As long as the filter returns ExprError, different
/// combinations of corrections will be tried until all are exhausted.
ExprResult
CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; });

ExprResult
CorrectDelayedTyposInExpr(Expr *E,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(E, nullptr, Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER, VarDecl *InitDecl = nullptr,
                          llvm::function_ref<ExprResult(Expr *)> Filter =
                              [](Expr *E) -> ExprResult { return E; }) {
  return ER.isInvalid() ? ER : CorrectDelayedTyposInExpr(ER.get(), Filter);
}

ExprResult
CorrectDelayedTyposInExpr(ExprResult ER,
                          llvm::function_ref<ExprResult(Expr *)> Filter) {
  return CorrectDelayedTyposInExpr(ER, nullptr, Filter);
}

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  bool ErrorRecovery = true);

void diagnoseTypo(const TypoCorrection &Correction,
                  const PartialDiagnostic &TypoDiag,
                  const PartialDiagnostic &PrevNote,
                  bool ErrorRecovery = true);

void MarkTypoCorrectedFunctionDefinition(const NamedDecl *F);

void FindAssociatedClassesAndNamespaces(SourceLocation InstantiationLoc,
                                        ArrayRef<Expr *> Args,
                                 AssociatedNamespaceSet &AssociatedNamespaces,
                                 AssociatedClassSet &AssociatedClasses);

void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
                          bool ConsiderLinkage, bool AllowInlineNamespace);

bool CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old);

void DiagnoseAmbiguousLookup(LookupResult &Result);
//@}

ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
                                        SourceLocation IdLoc,
                                        bool TypoCorrection = false);
NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
                               Scope *S, bool ForRedeclaration,
                               SourceLocation Loc);
NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
                                    Scope *S);
void AddKnownFunctionAttributes(FunctionDecl *FD);

// More parsing and symbol table subroutines.

void ProcessPragmaWeak(Scope *S, Decl *D);
// Decl attributes - this routine is the top level dispatcher.
void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD);
// Helper for delayed processing of attributes.
void ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList);
void ProcessDeclAttributeList(Scope *S, Decl *D, const AttributeList *AL,
                              bool IncludeCXX11Attributes = true);
bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
                                    const AttributeList *AttrList);

void checkUnusedDeclAttributes(Declarator &D);

/// Determine if type T is a valid subject for a nonnull and similar
/// attributes. By default, we look through references (the behavior used by
/// nonnull), but if the second parameter is true, then we treat a reference
/// type as valid.
bool isValidPointerAttrType(QualType T, bool RefOkay = false);

bool CheckRegparmAttr(const AttributeList &attr, unsigned &value);
bool CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
                          const FunctionDecl *FD = nullptr);
bool CheckNoReturnAttr(const AttributeList &attr);
bool CheckNoCallerSavedRegsAttr(const AttributeList &attr);
bool checkStringLiteralArgumentAttr(const AttributeList &Attr,
                                    unsigned ArgNum, StringRef &Str,
                                    SourceLocation *ArgLocation = nullptr);
bool checkSectionName(SourceLocation LiteralLoc, StringRef Str);
bool checkTargetAttr(SourceLocation LiteralLoc, StringRef Str);
bool checkMSInheritanceAttrOnDefinition(
    CXXRecordDecl *RD, SourceRange Range, bool BestCase,
    MSInheritanceAttr::Spelling SemanticSpelling);

void CheckAlignasUnderalignment(Decl *D);

/// Adjust the calling convention of a method to be the ABI default if it
/// wasn't specified explicitly.  This handles method types formed from
/// function type typedefs and typename template arguments.
void adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
                            SourceLocation Loc);

// Check if there is an explicit attribute, but only look through parens.
// The intent is to look for an attribute on the current declarator, but not
// one that came from a typedef.
bool hasExplicitCallingConv(QualType &T);

/// Get the outermost AttributedType node that sets a calling convention.
/// Valid types should not have multiple attributes with different CCs.
const AttributedType *getCallingConvAttributedType(QualType T) const;

/// Check whether a nullability type specifier can be added to the given
/// type.
///
/// \param type The type to which the nullability specifier will be
/// added. On success, this type will be updated appropriately.
///
/// \param nullability The nullability specifier to add.
///
/// \param nullabilityLoc The location of the nullability specifier.
///
/// \param isContextSensitive Whether this nullability specifier was
/// written as a context-sensitive keyword (in an Objective-C
/// method) or an Objective-C property attribute, rather than as an
/// underscored type specifier.
///
/// \param allowArrayTypes Whether to accept nullability specifiers on an
/// array type (e.g., because it will decay to a pointer).
///
/// \returns true if nullability cannot be applied, false otherwise.
bool checkNullabilityTypeSpecifier(QualType &type, NullabilityKind nullability,
                                   SourceLocation nullabilityLoc,
                                   bool isContextSensitive,
                                   bool allowArrayTypes);

/// \brief Stmt attributes - this routine is the top level dispatcher.
StmtResult ProcessStmtAttributes(Stmt *Stmt, AttributeList *Attrs,
                                 SourceRange Range);

void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *MethodDecl,
                                 bool IsProtocolMethodDecl);

void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
                                 ObjCMethodDecl *Overridden,
                                 bool IsProtocolMethodDecl);

/// WarnExactTypedMethods - This routine issues a warning if method
/// implementation declaration matches exactly that of its declaration.
void WarnExactTypedMethods(ObjCMethodDecl *Method,
                           ObjCMethodDecl *MethodDecl,
                           bool IsProtocolMethodDecl);

typedef llvm::SmallPtrSet<Selector, 8> SelectorSet;

/// CheckImplementationIvars - This routine checks if the instance variables
/// listed in the implelementation match those listed in the interface.
void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
                              ObjCIvarDecl **Fields, unsigned nIvars,
                              SourceLocation Loc);

/// ImplMethodsVsClassMethods - This is main routine to warn if any method
/// remains unimplemented in the class or category \@implementation.
void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
                               ObjCContainerDecl* IDecl,
                               bool IncompleteImpl = false);

/// DiagnoseUnimplementedProperties - This routine warns on those properties
/// which must be implemented by this implementation.
void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
                                     ObjCContainerDecl *CDecl,
                                     bool SynthesizeProperties);

/// Diagnose any null-resettable synthesized setters.
void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl);

/// DefaultSynthesizeProperties - This routine default synthesizes all
/// properties which must be synthesized in the class's \@implementation.
void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl,
                                 ObjCInterfaceDecl *IDecl,
                                 SourceLocation AtEnd);
void DefaultSynthesizeProperties(Scope *S, Decl *D, SourceLocation AtEnd);

/// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
/// an ivar synthesized for 'Method' and 'Method' is a property accessor
/// declared in class 'IFace'.
bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace,
                                    ObjCMethodDecl *Method, ObjCIvarDecl *IV);

/// DiagnoseUnusedBackingIvarInAccessor - Issue an 'unused' warning if ivar which
/// backs the property is not used in the property's accessor.
void DiagnoseUnusedBackingIvarInAccessor(Scope *S,
                                         const ObjCImplementationDecl *ImplD);

/// GetIvarBackingPropertyAccessor - If method is a property setter/getter and
/// it property has a backing ivar, returns this ivar; otherwise, returns NULL.
/// It also returns ivar's property on success.
ObjCIvarDecl *GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
                                             const ObjCPropertyDecl *&PDecl) const;

/// Called by ActOnProperty to handle \@property declarations in
/// class extensions.
ObjCPropertyDecl *HandlePropertyInClassExtension(Scope *S,
                    SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD,
                    Selector GetterSel,
                    SourceLocation GetterNameLoc,
                    Selector SetterSel,
                    SourceLocation SetterNameLoc,
                    const bool isReadWrite,
                    unsigned &Attributes,
                    const unsigned AttributesAsWritten,
                    QualType T,
                    TypeSourceInfo *TSI,
                    tok::ObjCKeywordKind MethodImplKind);

/// Called by ActOnProperty and HandlePropertyInClassExtension to
/// handle creating the ObjcPropertyDecl for a category or \@interface.
ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
                                     ObjCContainerDecl *CDecl,
                                     SourceLocation AtLoc,
                                     SourceLocation LParenLoc,
                                     FieldDeclarator &FD,
                                     Selector GetterSel,
                                     SourceLocation GetterNameLoc,
                                     Selector SetterSel,
                                     SourceLocation SetterNameLoc,
                                     const bool isReadWrite,
                                     const unsigned Attributes,
                                     const unsigned AttributesAsWritten,
                                     QualType T,
                                     TypeSourceInfo *TSI,
                                     tok::ObjCKeywordKind MethodImplKind,
                                     DeclContext *lexicalDC = nullptr);

/// AtomicPropertySetterGetterRules - This routine enforces the rule (via
/// warning) when atomic property has one but not the other user-declared
/// setter or getter.
void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
                                     ObjCInterfaceDecl* IDecl);

void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);

void DiagnoseMissingDesignatedInitOverrides(
                                        const ObjCImplementationDecl *ImplD,
                                        const ObjCInterfaceDecl *IFD);

void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);

enum MethodMatchStrategy {
  MMS_loose,
  MMS_strict
};

/// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
/// true, or false, accordingly.
bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
                                const ObjCMethodDecl *PrevMethod,
                                MethodMatchStrategy strategy = MMS_strict);

/// MatchAllMethodDeclarations - Check methods declaraed in interface or
/// or protocol against those declared in their implementations.
void MatchAllMethodDeclarations(const SelectorSet &InsMap,
                                const SelectorSet &ClsMap,
                                SelectorSet &InsMapSeen,
                                SelectorSet &ClsMapSeen,
                                ObjCImplDecl* IMPDecl,
                                ObjCContainerDecl* IDecl,
                                bool &IncompleteImpl,
                                bool ImmediateClass,
                                bool WarnCategoryMethodImpl=false);

/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
/// category matches with those implemented in its primary class and
/// warns each time an exact match is found.
void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);

/// \brief Add the given method to the list of globally-known methods.
void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);

3539private:
/// AddMethodToGlobalPool - Add an instance or factory method to the global
/// pool. See descriptoin of AddInstanceMethodToGlobalPool.
void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);

/// LookupMethodInGlobalPool - Returns the instance or factory method and
/// optionally warns if there are multiple signatures.
ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
                                         bool receiverIdOrClass,
                                         bool instance);

3550public:
/// \brief - Returns instance or factory methods in global method pool for
/// given selector. It checks the desired kind first, if none is found, and
/// parameter checkTheOther is set, it then checks the other kind. If no such
/// method or only one method is found, function returns false; otherwise, it
/// returns true.
bool
CollectMultipleMethodsInGlobalPool(Selector Sel,
                                   SmallVectorImpl<ObjCMethodDecl*>& Methods,
                                   bool InstanceFirst, bool CheckTheOther,
                                   const ObjCObjectType *TypeBound = nullptr);

bool
AreMultipleMethodsInGlobalPool(Selector Sel, ObjCMethodDecl *BestMethod,
                               SourceRange R, bool receiverIdOrClass,
                               SmallVectorImpl<ObjCMethodDecl*>& Methods);

void
DiagnoseMultipleMethodInGlobalPool(SmallVectorImpl<ObjCMethodDecl*> &Methods,
                                   Selector Sel, SourceRange R,
                                   bool receiverIdOrClass);

3572private:
/// \brief - Returns a selector which best matches given argument list or
/// nullptr if none could be found
ObjCMethodDecl *SelectBestMethod(Selector Sel, MultiExprArg Args,
                                 bool IsInstance,
                                 SmallVectorImpl<ObjCMethodDecl*>& Methods);


/// \brief Record the typo correction failure and return an empty correction.
TypoCorrection FailedCorrection(IdentifierInfo *Typo, SourceLocation TypoLoc,
                                bool RecordFailure = true) {
  if (RecordFailure)
    TypoCorrectionFailures[Typo].insert(TypoLoc);
  return TypoCorrection();
}

3588public:
/// AddInstanceMethodToGlobalPool - All instance methods in a translation
/// unit are added to a global pool. This allows us to efficiently associate
/// a selector with a method declaraation for purposes of typechecking
/// messages sent to "id" (where the class of the object is unknown).
void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/true);
}

/// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
  AddMethodToGlobalPool(Method, impl, /*instance*/false);
}

/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
/// pool.
void AddAnyMethodToGlobalPool(Decl *D);

/// LookupInstanceMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R,
                                                 bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/true);
}

/// LookupFactoryMethodInGlobalPool - Returns the method and warns if
/// there are multiple signatures.
ObjCMethodDecl *LookupFactoryMethodInGlobalPool(Selector Sel, SourceRange R,
                                                bool receiverIdOrClass=false) {
  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
                                  /*instance*/false);
}

const ObjCMethodDecl *SelectorsForTypoCorrection(Selector Sel,
                            QualType ObjectType=QualType());
/// LookupImplementedMethodInGlobalPool - Returns the method which has an
/// implementation.
ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);

/// CollectIvarsToConstructOrDestruct - Collect those ivars which require
/// initialization.
void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
                                SmallVectorImpl<ObjCIvarDecl*> &Ivars);

//===--------------------------------------------------------------------===//
// Statement Parsing Callbacks: SemaStmt.cpp.
3635public:
class FullExprArg {
public:
  FullExprArg() : E(nullptr) { }
  FullExprArg(Sema &actions) : E(nullptr) { }

  ExprResult release() {
    return E;
  }

  Expr *get() const { return E; }

  Expr *operator->() {
    return E;
  }

private:
  // FIXME: No need to make the entire Sema class a friend when it's just
  // Sema::MakeFullExpr that needs access to the constructor below.
  friend class Sema;

  explicit FullExprArg(Expr *expr) : E(expr) {}

  Expr *E;
};

FullExprArg MakeFullExpr(Expr *Arg) {
  return MakeFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation());
}
FullExprArg MakeFullExpr(Expr *Arg, SourceLocation CC) {
  return FullExprArg(ActOnFinishFullExpr(Arg, CC).get());
}
FullExprArg MakeFullDiscardedValueExpr(Expr *Arg) {
  ExprResult FE =
    ActOnFinishFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation(),
                        /*DiscardedValue*/ true);
  return FullExprArg(FE.get());
}

StmtResult ActOnExprStmt(ExprResult Arg);
StmtResult ActOnExprStmtError();

StmtResult ActOnNullStmt(SourceLocation SemiLoc,
                         bool HasLeadingEmptyMacro = false);

void ActOnStartOfCompoundStmt(bool IsStmtExpr);
void ActOnFinishOfCompoundStmt();
StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
                             ArrayRef<Stmt *> Elts, bool isStmtExpr);

/// \brief A RAII object to enter scope of a compound statement.
class CompoundScopeRAII {
public:
  CompoundScopeRAII(Sema &S, bool IsStmtExpr = false) : S(S) {
    S.ActOnStartOfCompoundStmt(IsStmtExpr);
  }

  ~CompoundScopeRAII() {
    S.ActOnFinishOfCompoundStmt();
  }

private:
  Sema &S;
};

/// An RAII helper that pops function a function scope on exit.
struct FunctionScopeRAII {
  Sema &S;
  bool Active;
  FunctionScopeRAII(Sema &S) : S(S), Active(true) {}
  ~FunctionScopeRAII() {
    if (Active)
      S.PopFunctionScopeInfo();
  }
  void disable() { Active = false; }
};

StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
                                 SourceLocation StartLoc,
                                 SourceLocation EndLoc);
void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
StmtResult ActOnForEachLValueExpr(Expr *E);
StmtResult ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
                                 SourceLocation DotDotDotLoc, Expr *RHSVal,
                                 SourceLocation ColonLoc);
void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);

StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
                                    SourceLocation ColonLoc,
                                    Stmt *SubStmt, Scope *CurScope);
StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
                          SourceLocation ColonLoc, Stmt *SubStmt);

StmtResult ActOnAttributedStmt(SourceLocation AttrLoc,
                               ArrayRef<const Attr*> Attrs,
                               Stmt *SubStmt);

class ConditionResult;
StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
                       Stmt *InitStmt,
                       ConditionResult Cond, Stmt *ThenVal,
                       SourceLocation ElseLoc, Stmt *ElseVal);
StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
                                  Stmt *InitStmt,
                                  ConditionResult Cond);
StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
                                         Stmt *Switch, Stmt *Body);
StmtResult ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
                          Stmt *Body);
StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
                       SourceLocation WhileLoc, SourceLocation CondLParen,
                       Expr *Cond, SourceLocation CondRParen);

StmtResult ActOnForStmt(SourceLocation ForLoc,
                        SourceLocation LParenLoc,
                        Stmt *First,
                        ConditionResult Second,
                        FullExprArg Third,
                        SourceLocation RParenLoc,
                        Stmt *Body);
ExprResult CheckObjCForCollectionOperand(SourceLocation forLoc,
                                         Expr *collection);
StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
                                      Stmt *First, Expr *collection,
                                      SourceLocation RParenLoc);
StmtResult FinishObjCForCollectionStmt(Stmt *ForCollection, Stmt *Body);

enum BuildForRangeKind {
  /// Initial building of a for-range statement.
  BFRK_Build,
  /// Instantiation or recovery rebuild of a for-range statement. Don't
  /// attempt any typo-correction.
  BFRK_Rebuild,
  /// Determining whether a for-range statement could be built. Avoid any
  /// unnecessary or irreversible actions.
  BFRK_Check
};

StmtResult ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                Stmt *LoopVar,
                                SourceLocation ColonLoc, Expr *Collection,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
                                SourceLocation CoawaitLoc,
                                SourceLocation ColonLoc,
                                Stmt *RangeDecl, Stmt *Begin, Stmt *End,
                                Expr *Cond, Expr *Inc,
                                Stmt *LoopVarDecl,
                                SourceLocation RParenLoc,
                                BuildForRangeKind Kind);
StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);

StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
                         SourceLocation LabelLoc,
                         LabelDecl *TheDecl);
StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
                                 SourceLocation StarLoc,
                                 Expr *DestExp);
StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
StmtResult ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope);

void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind, unsigned NumParams);
typedef std::pair<StringRef, QualType> CapturedParamNameType;
void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
                              CapturedRegionKind Kind,
                              ArrayRef<CapturedParamNameType> Params);
StmtResult ActOnCapturedRegionEnd(Stmt *S);
void ActOnCapturedRegionError();
RecordDecl *CreateCapturedStmtRecordDecl(CapturedDecl *&CD,
                                         SourceLocation Loc,
                                         unsigned NumParams);
VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
                                 bool AllowParamOrMoveConstructible);
bool isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
                            bool AllowParamOrMoveConstructible);

StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
                           Scope *CurScope);
StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);

StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
                           bool IsVolatile, unsigned NumOutputs,
                           unsigned NumInputs, IdentifierInfo **Names,
                           MultiExprArg Constraints, MultiExprArg Exprs,
                           Expr *AsmString, MultiExprArg Clobbers,
                           SourceLocation RParenLoc);

void FillInlineAsmIdentifierInfo(Expr *Res,
                                 llvm::InlineAsmIdentifierInfo &Info);
ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                                     UnqualifiedId &Id,
                                     bool IsUnevaluatedContext);
bool LookupInlineAsmField(StringRef Base, StringRef Member,
                          unsigned &Offset, SourceLocation AsmLoc);
ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member,
                                       SourceLocation AsmLoc);
StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
                          ArrayRef<Token> AsmToks,
                          StringRef AsmString,
                          unsigned NumOutputs, unsigned NumInputs,
                          ArrayRef<StringRef> Constraints,
                          ArrayRef<StringRef> Clobbers,
                          ArrayRef<Expr*> Exprs,
                          SourceLocation EndLoc);
LabelDecl *GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
                                 SourceLocation Location,
                                 bool AlwaysCreate);

VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
                                SourceLocation StartLoc,
                                SourceLocation IdLoc, IdentifierInfo *Id,
                                bool Invalid = false);

Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);

StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
                                Decl *Parm, Stmt *Body);

StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);

StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
                              MultiStmtArg Catch, Stmt *Finally);

StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
                                Scope *CurScope);
ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
                                          Expr *operand);
StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
                                       Expr *SynchExpr,
                                       Stmt *SynchBody);

StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);

VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
                                   SourceLocation StartLoc,
                                   SourceLocation IdLoc,
                                   IdentifierInfo *Id);

Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);

StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
                              Decl *ExDecl, Stmt *HandlerBlock);
StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
                            ArrayRef<Stmt *> Handlers);

StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
                            SourceLocation TryLoc, Stmt *TryBlock,
                            Stmt *Handler);
StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
                               Expr *FilterExpr,
                               Stmt *Block);
void ActOnStartSEHFinallyBlock();
void ActOnAbortSEHFinallyBlock();
StmtResult ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block);
StmtResult ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope);

void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);

bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;

/// \brief If it's a file scoped decl that must warn if not used, keep track
/// of it.
void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);

/// DiagnoseUnusedExprResult - If the statement passed in is an expression
/// whose result is unused, warn.
void DiagnoseUnusedExprResult(const Stmt *S);
void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
void DiagnoseUnusedDecl(const NamedDecl *ND);

/// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
/// statement as a \p Body, and it is located on the same line.
///
/// This helps prevent bugs due to typos, such as:
///     if (condition);
///       do_stuff();
void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
                           const Stmt *Body,
                           unsigned DiagID);

/// Warn if a for/while loop statement \p S, which is followed by
/// \p PossibleBody, has a suspicious null statement as a body.
void DiagnoseEmptyLoopBody(const Stmt *S,
                           const Stmt *PossibleBody);

/// Warn if a value is moved to itself.
void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
                      SourceLocation OpLoc);

/// \brief Warn if we're implicitly casting from a _Nullable pointer type to a
/// _Nonnull one.
void diagnoseNullableToNonnullConversion(QualType DstType, QualType SrcType,
                                         SourceLocation Loc);

/// Warn when implicitly casting 0 to nullptr.
void diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E);

ParsingDeclState PushParsingDeclaration(sema::DelayedDiagnosticPool &pool) {
  return DelayedDiagnostics.push(pool);
}
void PopParsingDeclaration(ParsingDeclState state, Decl *decl);

typedef ProcessingContextState ParsingClassState;
ParsingClassState PushParsingClass() {
  return DelayedDiagnostics.pushUndelayed();
}
void PopParsingClass(ParsingClassState state) {
  DelayedDiagnostics.popUndelayed(state);
}

void redelayDiagnostics(sema::DelayedDiagnosticPool &pool);

void DiagnoseAvailabilityOfDecl(NamedDecl *D, SourceLocation Loc,
                                const ObjCInterfaceDecl *UnknownObjCClass,
                                bool ObjCPropertyAccess,
                                bool AvoidPartialAvailabilityChecks = false);

bool makeUnavailableInSystemHeader(SourceLocation loc,
                                   UnavailableAttr::ImplicitReason reason);

/// \brief Issue any -Wunguarded-availability warnings in \c FD
void DiagnoseUnguardedAvailabilityViolations(Decl *FD);

//===--------------------------------------------------------------------===//
// Expression Parsing Callbacks: SemaExpr.cpp.

bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid);
bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
                       const ObjCInterfaceDecl *UnknownObjCClass = nullptr,
                       bool ObjCPropertyAccess = false,
                       bool AvoidPartialAvailabilityChecks = false);
void NoteDeletedFunction(FunctionDecl *FD);
void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD);
std::string getDeletedOrUnavailableSuffix(const FunctionDecl *FD);
bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
                                      ObjCMethodDecl *Getter,
                                      SourceLocation Loc);
void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
                           ArrayRef<Expr *> Args);

void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                     Decl *LambdaContextDecl = nullptr,
                                     bool IsDecltype = false);
enum ReuseLambdaContextDecl_t { ReuseLambdaContextDecl };
void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
                                     ReuseLambdaContextDecl_t,
                                     bool IsDecltype = false);
void PopExpressionEvaluationContext();

void DiscardCleanupsInEvaluationContext();

ExprResult TransformToPotentiallyEvaluated(Expr *E);
ExprResult HandleExprEvaluationContextForTypeof(Expr *E);

ExprResult ActOnConstantExpression(ExprResult Res);

// Functions for marking a declaration referenced.  These functions also
// contain the relevant logic for marking if a reference to a function or
// variable is an odr-use (in the C++11 sense).  There are separate variants
// for expressions referring to a decl; these exist because odr-use marking
// needs to be delayed for some constant variables when we build one of the
// named expressions.
//
// MightBeOdrUse indicates whether the use could possibly be an odr-use, and
// should usually be true. This only needs to be set to false if the lack of
// odr-use cannot be determined from the current context (for instance,
// because the name denotes a virtual function and was written without an
// explicit nested-name-specifier).
void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse);
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
                            bool MightBeOdrUse = true);
void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base = nullptr);
void MarkMemberReferenced(MemberExpr *E);

void UpdateMarkingForLValueToRValue(Expr *E);
void CleanupVarDeclMarking();

enum TryCaptureKind {
  TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
};

/// \brief Try to capture the given variable.
///
/// \param Var The variable to capture.
///
/// \param Loc The location at which the capture occurs.
///
/// \param Kind The kind of capture, which may be implicit (for either a
/// block or a lambda), or explicit by-value or by-reference (for a lambda).
///
/// \param EllipsisLoc The location of the ellipsis, if one is provided in
/// an explicit lambda capture.
///
/// \param BuildAndDiagnose Whether we are actually supposed to add the
/// captures or diagnose errors. If false, this routine merely check whether
/// the capture can occur without performing the capture itself or complaining
/// if the variable cannot be captured.
///
/// \param CaptureType Will be set to the type of the field used to capture
/// this variable in the innermost block or lambda. Only valid when the
/// variable can be captured.
///
/// \param DeclRefType Will be set to the type of a reference to the capture
/// from within the current scope. Only valid when the variable can be
/// captured.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// variables that may or may not be used in certain specializations of
/// a nested generic lambda.
///
/// \returns true if an error occurred (i.e., the variable cannot be
/// captured) and false if the capture succeeded.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
                        SourceLocation EllipsisLoc, bool BuildAndDiagnose,
                        QualType &CaptureType,
                        QualType &DeclRefType,
                        const unsigned *const FunctionScopeIndexToStopAt);

/// \brief Try to capture the given variable.
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
                        TryCaptureKind Kind = TryCapture_Implicit,
                        SourceLocation EllipsisLoc = SourceLocation());

/// \brief Checks if the variable must be captured.
bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);

/// \brief Given a variable, determine the type that a reference to that
/// variable will have in the given scope.
QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);

/// Mark all of the declarations referenced within a particular AST node as
/// referenced. Used when template instantiation instantiates a non-dependent
/// type -- entities referenced by the type are now referenced.
void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
void MarkDeclarationsReferencedInExpr(Expr *E,
                                      bool SkipLocalVariables = false);

/// \brief Try to recover by turning the given expression into a
/// call.  Returns true if recovery was attempted or an error was
/// emitted; this may also leave the ExprResult invalid.
bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
                          bool ForceComplain = false,
                          bool (*IsPlausibleResult)(QualType) = nullptr);

/// \brief Figure out if an expression could be turned into a call.
bool tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
                   UnresolvedSetImpl &NonTemplateOverloads);

/// \brief Conditionally issue a diagnostic based on the current
/// evaluation context.
///
/// \param Statement If Statement is non-null, delay reporting the
/// diagnostic until the function body is parsed, and then do a basic
/// reachability analysis to determine if the statement is reachable.
/// If it is unreachable, the diagnostic will not be emitted.
bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
                         const PartialDiagnostic &PD);

// Primary Expressions.
SourceRange getExprRange(Expr *E) const;

ExprResult ActOnIdExpression(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand,
    std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr,
    bool IsInlineAsmIdentifier = false, Token *KeywordReplacement = nullptr);

void DecomposeUnqualifiedId(const UnqualifiedId &Id,
                            TemplateArgumentListInfo &Buffer,
                            DeclarationNameInfo &NameInfo,
                            const TemplateArgumentListInfo *&TemplateArgs);

bool
DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
                    std::unique_ptr<CorrectionCandidateCallback> CCC,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
                    ArrayRef<Expr *> Args = None, TypoExpr **Out = nullptr);

ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
                              IdentifierInfo *II,
                              bool AllowBuiltinCreation=false);

ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
                                      SourceLocation TemplateKWLoc,
                                      const DeclarationNameInfo &NameInfo,
                                      bool isAddressOfOperand,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
                            ExprValueKind VK,
                            SourceLocation Loc,
                            const CXXScopeSpec *SS = nullptr);
ExprResult
BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
                 const DeclarationNameInfo &NameInfo,
                 const CXXScopeSpec *SS = nullptr,
                 NamedDecl *FoundD = nullptr,
                 const TemplateArgumentListInfo *TemplateArgs = nullptr);
ExprResult
BuildAnonymousStructUnionMemberReference(
    const CXXScopeSpec &SS,
    SourceLocation nameLoc,
    IndirectFieldDecl *indirectField,
    DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_none),
    Expr *baseObjectExpr = nullptr,
    SourceLocation opLoc = SourceLocation());

ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
                                           SourceLocation TemplateKWLoc,
                                           LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                           const Scope *S);
ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
                                   SourceLocation TemplateKWLoc,
                                   LookupResult &R,
                              const TemplateArgumentListInfo *TemplateArgs,
                                   bool IsDefiniteInstance,
                                   const Scope *S);
bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
                                const LookupResult &R,
                                bool HasTrailingLParen);

ExprResult
BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
                                  const DeclarationNameInfo &NameInfo,
                                  bool IsAddressOfOperand, const Scope *S,
                                  TypeSourceInfo **RecoveryTSI = nullptr);

ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
                                     SourceLocation TemplateKWLoc,
                              const DeclarationNameInfo &NameInfo,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
                                    LookupResult &R,
                                    bool NeedsADL,
                                    bool AcceptInvalidDecl = false);
ExprResult BuildDeclarationNameExpr(
    const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
    NamedDecl *FoundD = nullptr,
    const TemplateArgumentListInfo *TemplateArgs = nullptr,
    bool AcceptInvalidDecl = false);

ExprResult BuildLiteralOperatorCall(LookupResult &R,
                    DeclarationNameInfo &SuffixInfo,
                    ArrayRef<Expr *> Args,
                    SourceLocation LitEndLoc,
                    TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr);

ExprResult BuildPredefinedExpr(SourceLocation Loc,
                               PredefinedExpr::IdentType IT);
ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);

bool CheckLoopHintExpr(Expr *E, SourceLocation Loc);

ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = nullptr);
ExprResult ActOnCharacterConstant(const Token &Tok,
                                  Scope *UDLScope = nullptr);
ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
ExprResult ActOnParenListExpr(SourceLocation L,
                              SourceLocation R,
                              MultiExprArg Val);

/// ActOnStringLiteral - The specified tokens were lexed as pasted string
/// fragments (e.g. "foo" "bar" L"baz").
ExprResult ActOnStringLiteral(ArrayRef<Token> StringToks,
                              Scope *UDLScope = nullptr);

ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
                                     SourceLocation DefaultLoc,
                                     SourceLocation RParenLoc,
                                     Expr *ControllingExpr,
                                     ArrayRef<ParsedType> ArgTypes,
                                     ArrayRef<Expr *> ArgExprs);
ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
                                      SourceLocation DefaultLoc,
                                      SourceLocation RParenLoc,
                                      Expr *ControllingExpr,
                                      ArrayRef<TypeSourceInfo *> Types,
                                      ArrayRef<Expr *> Exprs);

// Binary/Unary Operators.  'Tok' is the token for the operator.
ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
                                Expr *InputExpr);
ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
                        UnaryOperatorKind Opc, Expr *Input);
ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
                        tok::TokenKind Op, Expr *Input);

QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc);

ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
                                          SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind,
                                          SourceRange R);
ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
                                          UnaryExprOrTypeTrait ExprKind);
ExprResult
  ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
                                UnaryExprOrTypeTrait ExprKind,
                                bool IsType, void *TyOrEx,
                                SourceRange ArgRange);

ExprResult CheckPlaceholderExpr(Expr *E);
bool CheckVecStepExpr(Expr *E);

bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
                                      SourceRange ExprRange,
                                      UnaryExprOrTypeTrait ExprKind);
ExprResult ActOnSizeofParameterPackExpr(Scope *S,
                                        SourceLocation OpLoc,
                                        IdentifierInfo &Name,
                                        SourceLocation NameLoc,
                                        SourceLocation RParenLoc);
ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
                               tok::TokenKind Kind, Expr *Input);

ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
                                   Expr *Idx, SourceLocation RLoc);
ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
                                           Expr *Idx, SourceLocation RLoc);
ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
                                    Expr *LowerBound, SourceLocation ColonLoc,
                                    Expr *Length, SourceLocation RBLoc);

// This struct is for use by ActOnMemberAccess to allow
// BuildMemberReferenceExpr to be able to reinvoke ActOnMemberAccess after
// changing the access operator from a '.' to a '->' (to see if that is the
// change needed to fix an error about an unknown member, e.g. when the class
// defines a custom operator->).
struct ActOnMemberAccessExtraArgs {
  Scope *S;
  UnqualifiedId &Id;
  Decl *ObjCImpDecl;
};

ExprResult BuildMemberReferenceExpr(
    Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow,
    CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo,
    const TemplateArgumentListInfo *TemplateArgs,
    const Scope *S,
    ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult
BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc,
                         bool IsArrow, const CXXScopeSpec &SS,
                         SourceLocation TemplateKWLoc,
                         NamedDecl *FirstQualifierInScope, LookupResult &R,
                         const TemplateArgumentListInfo *TemplateArgs,
                         const Scope *S,
                         bool SuppressQualifierCheck = false,
                         ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);

ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
                                   SourceLocation OpLoc,
                                   const CXXScopeSpec &SS, FieldDecl *Field,
                                   DeclAccessPair FoundDecl,
                                   const DeclarationNameInfo &MemberNameInfo);

ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);

bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
                                   const CXXScopeSpec &SS,
                                   const LookupResult &R);

ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
                                    bool IsArrow, SourceLocation OpLoc,
                                    const CXXScopeSpec &SS,
                                    SourceLocation TemplateKWLoc,
                                    NamedDecl *FirstQualifierInScope,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
                                 SourceLocation OpLoc,
                                 tok::TokenKind OpKind,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 UnqualifiedId &Member,
                                 Decl *ObjCImpDecl);

void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
                             FunctionDecl *FDecl,
                             const FunctionProtoType *Proto,
                             ArrayRef<Expr *> Args,
                             SourceLocation RParenLoc,
                             bool ExecConfig = false);
void CheckStaticArrayArgument(SourceLocation CallLoc,
                              ParmVarDecl *Param,
                              const Expr *ArgExpr);

/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
/// This provides the location of the left/right parens and a list of comma
/// locations.
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
                         MultiExprArg ArgExprs, SourceLocation RParenLoc,
                         Expr *ExecConfig = nullptr,
                         bool IsExecConfig = false);
ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
                                 SourceLocation LParenLoc,
                                 ArrayRef<Expr *> Arg,
                                 SourceLocation RParenLoc,
                                 Expr *Config = nullptr,
                                 bool IsExecConfig = false);

ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
                                   MultiExprArg ExecConfig,
                                   SourceLocation GGGLoc);

ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
                         Declarator &D, ParsedType &Ty,
                         SourceLocation RParenLoc, Expr *CastExpr);
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
                               TypeSourceInfo *Ty,
                               SourceLocation RParenLoc,
                               Expr *Op);
CastKind PrepareScalarCast(ExprResult &src, QualType destType);

/// \brief Build an altivec or OpenCL literal.
ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
                              SourceLocation RParenLoc, Expr *E,
                              TypeSourceInfo *TInfo);

ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);

ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
                                ParsedType Ty,
                                SourceLocation RParenLoc,
                                Expr *InitExpr);

ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
                                    TypeSourceInfo *TInfo,
                                    SourceLocation RParenLoc,
                                    Expr *LiteralExpr);

ExprResult ActOnInitList(SourceLocation LBraceLoc,
                         MultiExprArg InitArgList,
                         SourceLocation RBraceLoc);

ExprResult ActOnDesignatedInitializer(Designation &Desig,
                                      SourceLocation Loc,
                                      bool GNUSyntax,
                                      ExprResult Init);

4396private:
static BinaryOperatorKind ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind);

4399public:
ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
                      tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
                      BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
                              Expr *LHSExpr, Expr *RHSExpr);

void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc);

/// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
/// in the case of a the GNU conditional expr extension.
ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
                              SourceLocation ColonLoc,
                              Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);

/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
                          LabelDecl *TheDecl);

void ActOnStartStmtExpr();
ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
                         SourceLocation RPLoc); // "({..})"
void ActOnStmtExprError();

// __builtin_offsetof(type, identifier(.identifier|[expr])*)
struct OffsetOfComponent {
  SourceLocation LocStart, LocEnd;
  bool isBrackets;  // true if [expr], false if .ident
  union {
    IdentifierInfo *IdentInfo;
    Expr *E;
  } U;
};

/// __builtin_offsetof(type, a.b[123][456].c)
ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
                                TypeSourceInfo *TInfo,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);
ExprResult ActOnBuiltinOffsetOf(Scope *S,
                                SourceLocation BuiltinLoc,
                                SourceLocation TypeLoc,
                                ParsedType ParsedArgTy,
                                ArrayRef<OffsetOfComponent> Components,
                                SourceLocation RParenLoc);

// __builtin_choose_expr(constExpr, expr1, expr2)
ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
                           Expr *CondExpr, Expr *LHSExpr,
                           Expr *RHSExpr, SourceLocation RPLoc);

// __builtin_va_arg(expr, type)
ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
                      SourceLocation RPLoc);
ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
                          TypeSourceInfo *TInfo, SourceLocation RPLoc);

// __null
ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);

bool CheckCaseExpression(Expr *E);

/// \brief Describes the result of an "if-exists" condition check.
enum IfExistsResult {
  /// \brief The symbol exists.
  IER_Exists,

  /// \brief The symbol does not exist.
  IER_DoesNotExist,

  /// \brief The name is a dependent name, so the results will differ
  /// from one instantiation to the next.
  IER_Dependent,

  /// \brief An error occurred.
  IER_Error
};

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
                             const DeclarationNameInfo &TargetNameInfo);

IfExistsResult
CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
                             bool IsIfExists, CXXScopeSpec &SS,
                             UnqualifiedId &Name);

StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      NestedNameSpecifierLoc QualifierLoc,
                                      DeclarationNameInfo NameInfo,
                                      Stmt *Nested);
StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
                                      bool IsIfExists,
                                      CXXScopeSpec &SS, UnqualifiedId &Name,
                                      Stmt *Nested);

//===------------------------- "Block" Extension ------------------------===//

/// ActOnBlockStart - This callback is invoked when a block literal is
/// started.
void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockArguments - This callback allows processing of block arguments.
/// If there are no arguments, this is still invoked.
void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
                         Scope *CurScope);

/// ActOnBlockError - If there is an error parsing a block, this callback
/// is invoked to pop the information about the block from the action impl.
void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);

/// ActOnBlockStmtExpr - This is called when the body of a block statement
/// literal was successfully completed.  ^(int x){...}
ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
                              Scope *CurScope);

//===---------------------------- Clang Extensions ----------------------===//

/// __builtin_convertvector(...)
ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
                                  SourceLocation BuiltinLoc,
                                  SourceLocation RParenLoc);

//===---------------------------- OpenCL Features -----------------------===//

/// __builtin_astype(...)
ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
                           SourceLocation BuiltinLoc,
                           SourceLocation RParenLoc);

//===---------------------------- C++ Features --------------------------===//

// Act on C++ namespaces
Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
                             SourceLocation NamespaceLoc,
                             SourceLocation IdentLoc,
                             IdentifierInfo *Ident,
                             SourceLocation LBrace,
                             AttributeList *AttrList,
                             UsingDirectiveDecl * &UsingDecl);
void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);

NamespaceDecl *getStdNamespace() const;
NamespaceDecl *getOrCreateStdNamespace();

NamespaceDecl *lookupStdExperimentalNamespace();

CXXRecordDecl *getStdBadAlloc() const;
EnumDecl *getStdAlignValT() const;

/// \brief Tests whether Ty is an instance of std::initializer_list and, if
/// it is and Element is not NULL, assigns the element type to Element.
bool isStdInitializerList(QualType Ty, QualType *Element);

/// \brief Looks for the std::initializer_list template and instantiates it
/// with Element, or emits an error if it's not found.
///
/// \returns The instantiated template, or null on error.
QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);

/// \brief Determine whether Ctor is an initializer-list constructor, as
/// defined in [dcl.init.list]p2.
bool isInitListConstructor(const FunctionDecl *Ctor);

Decl *ActOnUsingDirective(Scope *CurScope,
                          SourceLocation UsingLoc,
                          SourceLocation NamespcLoc,
                          CXXScopeSpec &SS,
                          SourceLocation IdentLoc,
                          IdentifierInfo *NamespcName,
                          AttributeList *AttrList);

void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);

Decl *ActOnNamespaceAliasDef(Scope *CurScope,
                             SourceLocation NamespaceLoc,
                             SourceLocation AliasLoc,
                             IdentifierInfo *Alias,
                             CXXScopeSpec &SS,
                             SourceLocation IdentLoc,
                             IdentifierInfo *Ident);

void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
                          const LookupResult &PreviousDecls,
                          UsingShadowDecl *&PrevShadow);
UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
                                      NamedDecl *Target,
                                      UsingShadowDecl *PrevDecl);

bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
                                 bool HasTypenameKeyword,
                                 const CXXScopeSpec &SS,
                                 SourceLocation NameLoc,
                                 const LookupResult &Previous);
bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
                             bool HasTypename,
                             const CXXScopeSpec &SS,
                             const DeclarationNameInfo &NameInfo,
                             SourceLocation NameLoc);

NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
                                 SourceLocation UsingLoc,
                                 bool HasTypenameKeyword,
                                 SourceLocation TypenameLoc,
                                 CXXScopeSpec &SS,
                                 DeclarationNameInfo NameInfo,
                                 SourceLocation EllipsisLoc,
                                 AttributeList *AttrList,
                                 bool IsInstantiation);
NamedDecl *BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
                              ArrayRef<NamedDecl *> Expansions);

bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);

/// Given a derived-class using shadow declaration for a constructor and the
/// correspnding base class constructor, find or create the implicit
/// synthesized derived class constructor to use for this initialization.
CXXConstructorDecl *
findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor,
                          ConstructorUsingShadowDecl *DerivedShadow);

Decl *ActOnUsingDeclaration(Scope *CurScope,
                            AccessSpecifier AS,
                            SourceLocation UsingLoc,
                            SourceLocation TypenameLoc,
                            CXXScopeSpec &SS,
                            UnqualifiedId &Name,
                            SourceLocation EllipsisLoc,
                            AttributeList *AttrList);
Decl *ActOnAliasDeclaration(Scope *CurScope,
                            AccessSpecifier AS,
                            MultiTemplateParamsArg TemplateParams,
                            SourceLocation UsingLoc,
                            UnqualifiedId &Name,
                            AttributeList *AttrList,
                            TypeResult Type,
                            Decl *DeclFromDeclSpec);

/// BuildCXXConstructExpr - Creates a complete call to a constructor,
/// including handling of its default argument expressions.
///
/// \param ConstructKind - a CXXConstructExpr::ConstructionKind
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

/// Build a CXXConstructExpr whose constructor has already been resolved if
/// it denotes an inherited constructor.
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs,
                      bool HadMultipleCandidates, bool IsListInitialization,
                      bool IsStdInitListInitialization,
                      bool RequiresZeroInit, unsigned ConstructKind,
                      SourceRange ParenRange);

// FIXME: Can we remove this and have the above BuildCXXConstructExpr check if
// the constructor can be elidable?
ExprResult
BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
                      NamedDecl *FoundDecl,
                      CXXConstructorDecl *Constructor, bool Elidable,
                      MultiExprArg Exprs, bool HadMultipleCandidates,
                      bool IsListInitialization,
                      bool IsStdInitListInitialization, bool RequiresZeroInit,
                      unsigned ConstructKind, SourceRange ParenRange);

ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field);


/// Instantiate or parse a C++ default argument expression as necessary.
/// Return true on error.
bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
                            ParmVarDecl *Param);

/// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
/// the default expr if needed.
ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
                                  FunctionDecl *FD,
                                  ParmVarDecl *Param);

/// FinalizeVarWithDestructor - Prepare for calling destructor on the
/// constructed variable.
void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);

/// \brief Helper class that collects exception specifications for
/// implicitly-declared special member functions.
class ImplicitExceptionSpecification {
  // Pointer to allow copying
  Sema *Self;
  // We order exception specifications thus:
  // noexcept is the most restrictive, but is only used in C++11.
  // throw() comes next.
  // Then a throw(collected exceptions)
  // Finally no specification, which is expressed as noexcept(false).
  // throw(...) is used instead if any called function uses it.
  ExceptionSpecificationType ComputedEST;
  llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
  SmallVector<QualType, 4> Exceptions;

  void ClearExceptions() {
    ExceptionsSeen.clear();
    Exceptions.clear();
  }

public:
  explicit ImplicitExceptionSpecification(Sema &Self)
    : Self(&Self), ComputedEST(EST_BasicNoexcept) {
    if (!Self.getLangOpts().CPlusPlus11)
      ComputedEST = EST_DynamicNone;
  }

  /// \brief Get the computed exception specification type.
  ExceptionSpecificationType getExceptionSpecType() const {
    assert(ComputedEST != EST_ComputedNoexcept &&(static_cast <bool> (ComputedEST != EST_ComputedNoexcept
 && "noexcept(expr) should not be a possible result")
 ? void (0) : __assert_fail ("ComputedEST != EST_ComputedNoexcept && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 4723, __extension__ __PRETTY_FUNCTION__))
           "noexcept(expr) should not be a possible result")(static_cast <bool> (ComputedEST != EST_ComputedNoexcept
 && "noexcept(expr) should not be a possible result")
 ? void (0) : __assert_fail ("ComputedEST != EST_ComputedNoexcept && \"noexcept(expr) should not be a possible result\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 4723, __extension__ __PRETTY_FUNCTION__));
    return ComputedEST;
  }

  /// \brief The number of exceptions in the exception specification.
  unsigned size() const { return Exceptions.size(); }

  /// \brief The set of exceptions in the exception specification.
  const QualType *data() const { return Exceptions.data(); }

  /// \brief Integrate another called method into the collected data.
  void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method);

  /// \brief Integrate an invoked expression into the collected data.
  void CalledExpr(Expr *E);

  /// \brief Overwrite an EPI's exception specification with this
  /// computed exception specification.
  FunctionProtoType::ExceptionSpecInfo getExceptionSpec() const {
    FunctionProtoType::ExceptionSpecInfo ESI;
    ESI.Type = getExceptionSpecType();
    if (ESI.Type == EST_Dynamic) {
      ESI.Exceptions = Exceptions;
    } else if (ESI.Type == EST_None) {
      /// C++11 [except.spec]p14:
      ///   The exception-specification is noexcept(false) if the set of
      ///   potential exceptions of the special member function contains "any"
      ESI.Type = EST_ComputedNoexcept;
      ESI.NoexceptExpr = Self->ActOnCXXBoolLiteral(SourceLocation(),
                                                   tok::kw_false).get();
    }
    return ESI;
  }
};

/// \brief Determine what sort of exception specification a defaulted
/// copy constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
                                         CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted
/// default constructor of a class will have, and whether the parameter
/// will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defautled
/// copy assignment operator of a class will have, and whether the
/// parameter will be const.
ImplicitExceptionSpecification
ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted move
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted move
/// assignment operator of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification a defaulted
/// destructor of a class will have.
ImplicitExceptionSpecification
ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD);

/// \brief Determine what sort of exception specification an inheriting
/// constructor of a class will have.
ImplicitExceptionSpecification
ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
                                   CXXConstructorDecl *CD);

/// \brief Evaluate the implicit exception specification for a defaulted
/// special member function.
void EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD);

/// \brief Check the given exception-specification and update the
/// exception specification information with the results.
void checkExceptionSpecification(bool IsTopLevel,
                                 ExceptionSpecificationType EST,
                                 ArrayRef<ParsedType> DynamicExceptions,
                                 ArrayRef<SourceRange> DynamicExceptionRanges,
                                 Expr *NoexceptExpr,
                                 SmallVectorImpl<QualType> &Exceptions,
                                 FunctionProtoType::ExceptionSpecInfo &ESI);

/// \brief Determine if we're in a case where we need to (incorrectly) eagerly
/// parse an exception specification to work around a libstdc++ bug.
bool isLibstdcxxEagerExceptionSpecHack(const Declarator &D);

/// \brief Add an exception-specification to the given member function
/// (or member function template). The exception-specification was parsed
/// after the method itself was declared.
void actOnDelayedExceptionSpecification(Decl *Method,
       ExceptionSpecificationType EST,
       SourceRange SpecificationRange,
       ArrayRef<ParsedType> DynamicExceptions,
       ArrayRef<SourceRange> DynamicExceptionRanges,
       Expr *NoexceptExpr);

class InheritedConstructorInfo;

/// \brief Determine if a special member function should have a deleted
/// definition when it is defaulted.
bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
                               InheritedConstructorInfo *ICI = nullptr,
                               bool Diagnose = false);

/// \brief Declare the implicit default constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// default constructor will be added.
///
/// \returns The implicitly-declared default constructor.
CXXConstructorDecl *DeclareImplicitDefaultConstructor(
                                                   CXXRecordDecl *ClassDecl);

/// DefineImplicitDefaultConstructor - Checks for feasibility of
/// defining this constructor as the default constructor.
void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
                                      CXXConstructorDecl *Constructor);

/// \brief Declare the implicit destructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// destructor will be added.
///
/// \returns The implicitly-declared destructor.
CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitDestructor - Checks for feasibility of
/// defining this destructor as the default destructor.
void DefineImplicitDestructor(SourceLocation CurrentLocation,
                              CXXDestructorDecl *Destructor);

/// \brief Build an exception spec for destructors that don't have one.
///
/// C++11 says that user-defined destructors with no exception spec get one
/// that looks as if the destructor was implicitly declared.
void AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
                                   CXXDestructorDecl *Destructor);

/// \brief Define the specified inheriting constructor.
void DefineInheritingConstructor(SourceLocation UseLoc,
                                 CXXConstructorDecl *Constructor);

/// \brief Declare the implicit copy constructor for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy constructor will be added.
///
/// \returns The implicitly-declared copy constructor.
CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitCopyConstructor - Checks for feasibility of
/// defining this constructor as the copy constructor.
void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// \brief Declare the implicit move constructor for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move constructor will be added.
///
/// \returns The implicitly-declared move constructor, or NULL if it wasn't
/// declared.
CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);

/// DefineImplicitMoveConstructor - Checks for feasibility of
/// defining this constructor as the move constructor.
void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
                                   CXXConstructorDecl *Constructor);

/// \brief Declare the implicit copy assignment operator for the given class.
///
/// \param ClassDecl The class declaration into which the implicit
/// copy assignment operator will be added.
///
/// \returns The implicitly-declared copy assignment operator.
CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);

/// \brief Defines an implicitly-declared copy assignment operator.
void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// \brief Declare the implicit move assignment operator for the given class.
///
/// \param ClassDecl The Class declaration into which the implicit
/// move assignment operator will be added.
///
/// \returns The implicitly-declared move assignment operator, or NULL if it
/// wasn't declared.
CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);

/// \brief Defines an implicitly-declared move assignment operator.
void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
                                  CXXMethodDecl *MethodDecl);

/// \brief Force the declaration of any implicitly-declared members of this
/// class.
void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);

/// \brief Check a completed declaration of an implicit special member.
void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD);

/// \brief Determine whether the given function is an implicitly-deleted
/// special member function.
bool isImplicitlyDeleted(FunctionDecl *FD);

/// \brief Check whether 'this' shows up in the type of a static member
/// function after the (naturally empty) cv-qualifier-seq would be.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);

/// \brief Whether this' shows up in the exception specification of a static
/// member function.
bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);

/// \brief Check whether 'this' shows up in the attributes of the given
/// static member function.
///
/// \returns true if an error occurred.
bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);

/// MaybeBindToTemporary - If the passed in expression has a record type with
/// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
/// it simply returns the passed in expression.
ExprResult MaybeBindToTemporary(Expr *E);

bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
                             MultiExprArg ArgsPtr,
                             SourceLocation Loc,
                             SmallVectorImpl<Expr*> &ConvertedArgs,
                             bool AllowExplicit = false,
                             bool IsListInitialization = false);

ParsedType getInheritingConstructorName(CXXScopeSpec &SS,
                                        SourceLocation NameLoc,
                                        IdentifierInfo &Name);

ParsedType getDestructorName(SourceLocation TildeLoc,
                             IdentifierInfo &II, SourceLocation NameLoc,
                             Scope *S, CXXScopeSpec &SS,
                             ParsedType ObjectType,
                             bool EnteringContext);

ParsedType getDestructorTypeForDecltype(const DeclSpec &DS,
                                        ParsedType ObjectType);

// Checks that reinterpret casts don't have undefined behavior.
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
                                    bool IsDereference, SourceRange Range);

/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             SourceLocation LAngleBracketLoc,
                             Declarator &D,
                             SourceLocation RAngleBracketLoc,
                             SourceLocation LParenLoc,
                             Expr *E,
                             SourceLocation RParenLoc);

ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
                             tok::TokenKind Kind,
                             TypeSourceInfo *Ty,
                             Expr *E,
                             SourceRange AngleBrackets,
                             SourceRange Parens);

ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXTypeId(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXTypeid - Parse typeid( something ).
ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          TypeSourceInfo *Operand,
                          SourceLocation RParenLoc);
ExprResult BuildCXXUuidof(QualType TypeInfoType,
                          SourceLocation TypeidLoc,
                          Expr *Operand,
                          SourceLocation RParenLoc);

/// ActOnCXXUuidof - Parse __uuidof( something ).
ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
                          SourceLocation LParenLoc, bool isType,
                          void *TyOrExpr,
                          SourceLocation RParenLoc);

/// \brief Handle a C++1z fold-expression: ( expr op ... op expr ).
ExprResult ActOnCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            tok::TokenKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
                            BinaryOperatorKind Operator,
                            SourceLocation EllipsisLoc, Expr *RHS,
                            SourceLocation RParenLoc);
ExprResult BuildEmptyCXXFoldExpr(SourceLocation EllipsisLoc,
                                 BinaryOperatorKind Operator);

//// ActOnCXXThis -  Parse 'this' pointer.
ExprResult ActOnCXXThis(SourceLocation loc);

/// \brief Try to retrieve the type of the 'this' pointer.
///
/// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
QualType getCurrentThisType();

/// \brief When non-NULL, the C++ 'this' expression is allowed despite the
/// current context not being a non-static member function. In such cases,
/// this provides the type used for 'this'.
QualType CXXThisTypeOverride;

/// \brief RAII object used to temporarily allow the C++ 'this' expression
/// to be used, with the given qualifiers on the current class type.
class CXXThisScopeRAII {
  Sema &S;
  QualType OldCXXThisTypeOverride;
  bool Enabled;

public:
  /// \brief Introduce a new scope where 'this' may be allowed (when enabled),
  /// using the given declaration (which is either a class template or a
  /// class) along with the given qualifiers.
  /// along with the qualifiers placed on '*this'.
  CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
                   bool Enabled = true);

  ~CXXThisScopeRAII();
};

/// \brief Make sure the value of 'this' is actually available in the current
/// context, if it is a potentially evaluated context.
///
/// \param Loc The location at which the capture of 'this' occurs.
///
/// \param Explicit Whether 'this' is explicitly captured in a lambda
/// capture list.
///
/// \param FunctionScopeIndexToStopAt If non-null, it points to the index
/// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
/// This is useful when enclosing lambdas must speculatively capture
/// 'this' that may or may not be used in certain specializations of
/// a nested generic lambda (depending on whether the name resolves to
/// a non-static member function or a static function).
/// \return returns 'true' if failed, 'false' if success.
bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false,
    bool BuildAndDiagnose = true,
    const unsigned *const FunctionScopeIndexToStopAt = nullptr,
    bool ByCopy = false);

/// \brief Determine whether the given type is the type of *this that is used
/// outside of the body of a member function for a type that is currently
/// being defined.
bool isThisOutsideMemberFunctionBody(QualType BaseType);

/// ActOnCXXBoolLiteral - Parse {true,false} literals.
ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);


/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);

ExprResult
ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef<AvailabilitySpec> AvailSpecs,
                               SourceLocation AtLoc, SourceLocation RParen);

/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);

//// ActOnCXXThrow -  Parse throw expressions.
ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
                         bool IsThrownVarInScope);
bool CheckCXXThrowOperand(SourceLocation ThrowLoc, QualType ThrowTy, Expr *E);

/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
/// Can be interpreted either as function-style casting ("int(x)")
/// or class type construction ("ClassType(x,y,z)")
/// or creation of a value-initialized type ("int()").
ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
                                     SourceLocation LParenOrBraceLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenOrBraceLoc,
                                     bool ListInitialization);

ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
                                     SourceLocation LParenLoc,
                                     MultiExprArg Exprs,
                                     SourceLocation RParenLoc,
                                     bool ListInitialization);

/// ActOnCXXNew - Parsed a C++ 'new' expression.
ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens, Declarator &D,
                       Expr *Initializer);
ExprResult BuildCXXNew(SourceRange Range, bool UseGlobal,
                       SourceLocation PlacementLParen,
                       MultiExprArg PlacementArgs,
                       SourceLocation PlacementRParen,
                       SourceRange TypeIdParens,
                       QualType AllocType,
                       TypeSourceInfo *AllocTypeInfo,
                       Expr *ArraySize,
                       SourceRange DirectInitRange,
                       Expr *Initializer);

bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
                        SourceRange R);
bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
                             bool UseGlobal, QualType AllocType, bool IsArray,
                             bool &PassAlignment, MultiExprArg PlaceArgs,
                             FunctionDecl *&OperatorNew,
                             FunctionDecl *&OperatorDelete,
                             bool Diagnose = true);
void DeclareGlobalNewDelete();
void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
                                     ArrayRef<QualType> Params);

bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
                              DeclarationName Name, FunctionDecl* &Operator,
                              bool Diagnose = true);
FunctionDecl *FindUsualDeallocationFunction(SourceLocation StartLoc,
                                            bool CanProvideSize,
                                            bool Overaligned,
                                            DeclarationName Name);
FunctionDecl *FindDeallocationFunctionForDestructor(SourceLocation StartLoc,
                                                    CXXRecordDecl *RD);

/// ActOnCXXDelete - Parsed a C++ 'delete' expression
ExprResult ActOnCXXDelete(SourceLocation StartLoc,
                          bool UseGlobal, bool ArrayForm,
                          Expr *Operand);
void CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
                          bool IsDelete, bool CallCanBeVirtual,
                          bool WarnOnNonAbstractTypes,
                          SourceLocation DtorLoc);

ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
                             Expr *Operand, SourceLocation RParen);
ExprResult BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
                                SourceLocation RParen);

/// \brief Parsed one of the type trait support pseudo-functions.
ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<ParsedType> Args,
                          SourceLocation RParenLoc);
ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
                          ArrayRef<TypeSourceInfo *> Args,
                          SourceLocation RParenLoc);

/// ActOnArrayTypeTrait - Parsed one of the binary type trait support
/// pseudo-functions.
ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               ParsedType LhsTy,
                               Expr *DimExpr,
                               SourceLocation RParen);

ExprResult BuildArrayTypeTrait(ArrayTypeTrait ATT,
                               SourceLocation KWLoc,
                               TypeSourceInfo *TSInfo,
                               Expr *DimExpr,
                               SourceLocation RParen);

/// ActOnExpressionTrait - Parsed one of the unary type trait support
/// pseudo-functions.
ExprResult ActOnExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult BuildExpressionTrait(ExpressionTrait OET,
                                SourceLocation KWLoc,
                                Expr *Queried,
                                SourceLocation RParen);

ExprResult ActOnStartCXXMemberReference(Scope *S,
                                        Expr *Base,
                                        SourceLocation OpLoc,
                                        tok::TokenKind OpKind,
                                        ParsedType &ObjectType,
                                        bool &MayBePseudoDestructor);

ExprResult BuildPseudoDestructorExpr(Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     const CXXScopeSpec &SS,
                                     TypeSourceInfo *ScopeType,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                   PseudoDestructorTypeStorage DestroyedType);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     CXXScopeSpec &SS,
                                     UnqualifiedId &FirstTypeName,
                                     SourceLocation CCLoc,
                                     SourceLocation TildeLoc,
                                     UnqualifiedId &SecondTypeName);

ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc,
                                     tok::TokenKind OpKind,
                                     SourceLocation TildeLoc,
                                     const DeclSpec& DS);

/// MaybeCreateExprWithCleanups - If the current full-expression
/// requires any cleanups, surround it with a ExprWithCleanups node.
/// Otherwise, just returns the passed-in expression.
Expr *MaybeCreateExprWithCleanups(Expr *SubExpr);
Stmt *MaybeCreateStmtWithCleanups(Stmt *SubStmt);
ExprResult MaybeCreateExprWithCleanups(ExprResult SubExpr);

MaterializeTemporaryExpr *
CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
                               bool BoundToLvalueReference);

ExprResult ActOnFinishFullExpr(Expr *Expr) {
  return ActOnFinishFullExpr(Expr, Expr ? Expr->getExprLoc()
                                        : SourceLocation());
}
ExprResult ActOnFinishFullExpr(Expr *Expr, SourceLocation CC,
                               bool DiscardedValue = false,
                               bool IsConstexpr = false,
                               bool IsLambdaInitCaptureInitializer = false);
StmtResult ActOnFinishFullStmt(Stmt *Stmt);

// Marks SS invalid if it represents an incomplete type.
bool RequireCompleteDeclContext(CXXScopeSpec &SS, DeclContext *DC);

DeclContext *computeDeclContext(QualType T);
DeclContext *computeDeclContext(const CXXScopeSpec &SS,
                                bool EnteringContext = false);
bool isDependentScopeSpecifier(const CXXScopeSpec &SS);
CXXRecordDecl *getCurrentInstantiationOf(NestedNameSpecifier *NNS);

/// \brief The parser has parsed a global nested-name-specifier '::'.
///
/// \param CCLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXGlobalScopeSpecifier(SourceLocation CCLoc, CXXScopeSpec &SS);

/// \brief The parser has parsed a '__super' nested-name-specifier.
///
/// \param SuperLoc The location of the '__super' keyword.
///
/// \param ColonColonLoc The location of the '::'.
///
/// \param SS The nested-name-specifier, which will be updated in-place
/// to reflect the parsed nested-name-specifier.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
                              SourceLocation ColonColonLoc, CXXScopeSpec &SS);

bool isAcceptableNestedNameSpecifier(const NamedDecl *SD,
                                     bool *CanCorrect = nullptr);
NamedDecl *FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS);

/// \brief Keeps information about an identifier in a nested-name-spec.
///
struct NestedNameSpecInfo {
  /// \brief The type of the object, if we're parsing nested-name-specifier in
  /// a member access expression.
  ParsedType ObjectType;

  /// \brief The identifier preceding the '::'.
  IdentifierInfo *Identifier;

  /// \brief The location of the identifier.
  SourceLocation IdentifierLoc;

  /// \brief The location of the '::'.
  SourceLocation CCLoc;

  /// \brief Creates info object for the most typical case.
  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
           SourceLocation ColonColonLoc, ParsedType ObjectType = ParsedType())
    : ObjectType(ObjectType), Identifier(II), IdentifierLoc(IdLoc),
      CCLoc(ColonColonLoc) {
  }

  NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
                     SourceLocation ColonColonLoc, QualType ObjectType)
    : ObjectType(ParsedType::make(ObjectType)), Identifier(II),
      IdentifierLoc(IdLoc), CCLoc(ColonColonLoc) {
  }
};

bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
                                  NestedNameSpecInfo &IdInfo);

bool BuildCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 NamedDecl *ScopeLookupResult,
                                 bool ErrorRecoveryLookup,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

/// \brief The parser has parsed a nested-name-specifier 'identifier::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param IdInfo Parser information about an identifier in the
/// nested-name-spec.
///
/// \param EnteringContext Whether we're entering the context nominated by
/// this nested-name-specifier.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param ErrorRecoveryLookup If true, then this method is called to improve
/// error recovery. In this case do not emit error message.
///
/// \param IsCorrectedToColon If not null, suggestions to replace '::' -> ':'
/// are allowed.  The bool value pointed by this parameter is set to 'true'
/// if the identifier is treated as if it was followed by ':', not '::'.
///
/// \param OnlyNamespace If true, only considers namespaces in lookup.
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 NestedNameSpecInfo &IdInfo,
                                 bool EnteringContext,
                                 CXXScopeSpec &SS,
                                 bool ErrorRecoveryLookup = false,
                                 bool *IsCorrectedToColon = nullptr,
                                 bool OnlyNamespace = false);

ExprResult ActOnDecltypeExpression(Expr *E);

bool ActOnCXXNestedNameSpecifierDecltype(CXXScopeSpec &SS,
                                         const DeclSpec &DS,
                                         SourceLocation ColonColonLoc);

bool IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
                               NestedNameSpecInfo &IdInfo,
                               bool EnteringContext);

/// \brief The parser has parsed a nested-name-specifier
/// 'template[opt] template-name < template-args >::'.
///
/// \param S The scope in which this nested-name-specifier occurs.
///
/// \param SS The nested-name-specifier, which is both an input
/// parameter (the nested-name-specifier before this type) and an
/// output parameter (containing the full nested-name-specifier,
/// including this new type).
///
/// \param TemplateKWLoc the location of the 'template' keyword, if any.
/// \param TemplateName the template name.
/// \param TemplateNameLoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
/// \param CCLoc The location of the '::'.
///
/// \param EnteringContext Whether we're entering the context of the
/// nested-name-specifier.
///
///
/// \returns true if an error occurred, false otherwise.
bool ActOnCXXNestedNameSpecifier(Scope *S,
                                 CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 TemplateTy TemplateName,
                                 SourceLocation TemplateNameLoc,
                                 SourceLocation LAngleLoc,
                                 ASTTemplateArgsPtr TemplateArgs,
                                 SourceLocation RAngleLoc,
                                 SourceLocation CCLoc,
                                 bool EnteringContext);

/// \brief Given a C++ nested-name-specifier, produce an annotation value
/// that the parser can use later to reconstruct the given
/// nested-name-specifier.
///
/// \param SS A nested-name-specifier.
///
/// \returns A pointer containing all of the information in the
/// nested-name-specifier \p SS.
void *SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS);

/// \brief Given an annotation pointer for a nested-name-specifier, restore
/// the nested-name-specifier structure.
///
/// \param Annotation The annotation pointer, produced by
/// \c SaveNestedNameSpecifierAnnotation().
///
/// \param AnnotationRange The source range corresponding to the annotation.
///
/// \param SS The nested-name-specifier that will be updated with the contents
/// of the annotation pointer.
void RestoreNestedNameSpecifierAnnotation(void *Annotation,
                                          SourceRange AnnotationRange,
                                          CXXScopeSpec &SS);

bool ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
/// scope or nested-name-specifier) is parsed, part of a declarator-id.
/// After this method is called, according to [C++ 3.4.3p3], names should be
/// looked up in the declarator-id's scope, until the declarator is parsed and
/// ActOnCXXExitDeclaratorScope is called.
/// The 'SS' should be a non-empty valid CXXScopeSpec.
bool ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS);

/// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
/// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
/// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
/// Used to indicate that names should revert to being looked up in the
/// defining scope.
void ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS);

/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
/// initializer for the declaration 'Dcl'.
/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
/// static data member of class X, names should be looked up in the scope of
/// class X.
void ActOnCXXEnterDeclInitializer(Scope *S, Decl *Dcl);

/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
/// initializer for the declaration 'Dcl'.
void ActOnCXXExitDeclInitializer(Scope *S, Decl *Dcl);

/// \brief Create a new lambda closure type.
CXXRecordDecl *createLambdaClosureType(SourceRange IntroducerRange,
                                       TypeSourceInfo *Info,
                                       bool KnownDependent,
                                       LambdaCaptureDefault CaptureDefault);

/// \brief Start the definition of a lambda expression.
CXXMethodDecl *startLambdaDefinition(CXXRecordDecl *Class,
                                     SourceRange IntroducerRange,
                                     TypeSourceInfo *MethodType,
                                     SourceLocation EndLoc,
                                     ArrayRef<ParmVarDecl *> Params,
                                     bool IsConstexprSpecified);

/// \brief Endow the lambda scope info with the relevant properties.
void buildLambdaScope(sema::LambdaScopeInfo *LSI,
                      CXXMethodDecl *CallOperator,
                      SourceRange IntroducerRange,
                      LambdaCaptureDefault CaptureDefault,
                      SourceLocation CaptureDefaultLoc,
                      bool ExplicitParams,
                      bool ExplicitResultType,
                      bool Mutable);

/// \brief Perform initialization analysis of the init-capture and perform
/// any implicit conversions such as an lvalue-to-rvalue conversion if
/// not being used to initialize a reference.
ParsedType actOnLambdaInitCaptureInitialization(
    SourceLocation Loc, bool ByRef, IdentifierInfo *Id,
    LambdaCaptureInitKind InitKind, Expr *&Init) {
  return ParsedType::make(buildLambdaInitCaptureInitialization(
      Loc, ByRef, Id, InitKind != LambdaCaptureInitKind::CopyInit, Init));
}
QualType buildLambdaInitCaptureInitialization(SourceLocation Loc, bool ByRef,
                                              IdentifierInfo *Id,
                                              bool DirectInit, Expr *&Init);

/// \brief Create a dummy variable within the declcontext of the lambda's
///  call operator, for name lookup purposes for a lambda init capture.
///
///  CodeGen handles emission of lambda captures, ignoring these dummy
///  variables appropriately.
VarDecl *createLambdaInitCaptureVarDecl(SourceLocation Loc,
                                        QualType InitCaptureType,
                                        IdentifierInfo *Id,
                                        unsigned InitStyle, Expr *Init);

/// \brief Build the implicit field for an init-capture.
FieldDecl *buildInitCaptureField(sema::LambdaScopeInfo *LSI, VarDecl *Var);

/// \brief Note that we have finished the explicit captures for the
/// given lambda.
void finishLambdaExplicitCaptures(sema::LambdaScopeInfo *LSI);

/// \brief Introduce the lambda parameters into scope.
void addLambdaParameters(CXXMethodDecl *CallOperator, Scope *CurScope);

/// \brief Deduce a block or lambda's return type based on the return
/// statements present in the body.
void deduceClosureReturnType(sema::CapturingScopeInfo &CSI);

/// ActOnStartOfLambdaDefinition - This is called just before we start
/// parsing the body of a lambda; it analyzes the explicit captures and
/// arguments, and sets up various data-structures for the body of the
/// lambda.
void ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
                                  Declarator &ParamInfo, Scope *CurScope);

/// ActOnLambdaError - If there is an error parsing a lambda, this callback
/// is invoked to pop the information about the lambda.
void ActOnLambdaError(SourceLocation StartLoc, Scope *CurScope,
                      bool IsInstantiation = false);

/// ActOnLambdaExpr - This is called when the body of a lambda expression
/// was successfully completed.
ExprResult ActOnLambdaExpr(SourceLocation StartLoc, Stmt *Body,
                           Scope *CurScope);

/// \brief Does copying/destroying the captured variable have side effects?
bool CaptureHasSideEffects(const sema::LambdaScopeInfo::Capture &From);

/// \brief Diagnose if an explicit lambda capture is unused.
void DiagnoseUnusedLambdaCapture(const sema::LambdaScopeInfo::Capture &From);

/// \brief Complete a lambda-expression having processed and attached the
/// lambda body.
ExprResult BuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
                           sema::LambdaScopeInfo *LSI);

/// Get the return type to use for a lambda's conversion function(s) to
/// function pointer type, given the type of the call operator.
QualType
getLambdaConversionFunctionResultType(const FunctionProtoType *CallOpType);

/// \brief Define the "body" of the conversion from a lambda object to a
/// function pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToFunctionPointerConversion(
       SourceLocation CurrentLoc, CXXConversionDecl *Conv);

/// \brief Define the "body" of the conversion from a lambda object to a
/// block pointer.
///
/// This routine doesn't actually define a sensible body; rather, it fills
/// in the initialization expression needed to copy the lambda object into
/// the block, and IR generation actually generates the real body of the
/// block pointer conversion.
void DefineImplicitLambdaToBlockPointerConversion(SourceLocation CurrentLoc,
                                                  CXXConversionDecl *Conv);

ExprResult BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
                                         SourceLocation ConvLocation,
                                         CXXConversionDecl *Conv,
                                         Expr *Src);

// ParseObjCStringLiteral - Parse Objective-C string literals.
ExprResult ParseObjCStringLiteral(SourceLocation *AtLocs,
                                  ArrayRef<Expr *> Strings);

ExprResult BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S);

/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
/// numeric literal expression. Type of the expression will be "NSNumber *"
/// or "id" if NSNumber is unavailable.
ExprResult BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number);
ExprResult ActOnObjCBoolLiteral(SourceLocation AtLoc, SourceLocation ValueLoc,
                                bool Value);
ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements);

/// BuildObjCBoxedExpr - builds an ObjCBoxedExpr AST node for the
/// '@' prefixed parenthesized expression. The type of the expression will
/// either be "NSNumber *", "NSString *" or "NSValue *" depending on the type
/// of ValueType, which is allowed to be a built-in numeric type, "char *",
/// "const char *" or C structure with attribute 'objc_boxable'.
ExprResult BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr);

ExprResult BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
                                        Expr *IndexExpr,
                                        ObjCMethodDecl *getterMethod,
                                        ObjCMethodDecl *setterMethod);

ExprResult BuildObjCDictionaryLiteral(SourceRange SR,
                             MutableArrayRef<ObjCDictionaryElement> Elements);

ExprResult BuildObjCEncodeExpression(SourceLocation AtLoc,
                                TypeSourceInfo *EncodedTypeInfo,
                                SourceLocation RParenLoc);
ExprResult BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl,
                                  CXXConversionDecl *Method,
                                  bool HadMultipleCandidates);

ExprResult ParseObjCEncodeExpression(SourceLocation AtLoc,
                                     SourceLocation EncodeLoc,
                                     SourceLocation LParenLoc,
                                     ParsedType Ty,
                                     SourceLocation RParenLoc);

/// ParseObjCSelectorExpression - Build selector expression for \@selector
ExprResult ParseObjCSelectorExpression(Selector Sel,
                                       SourceLocation AtLoc,
                                       SourceLocation SelLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation RParenLoc,
                                       bool WarnMultipleSelectors);

/// ParseObjCProtocolExpression - Build protocol expression for \@protocol
ExprResult ParseObjCProtocolExpression(IdentifierInfo * ProtocolName,
                                       SourceLocation AtLoc,
                                       SourceLocation ProtoLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation ProtoIdLoc,
                                       SourceLocation RParenLoc);

//===--------------------------------------------------------------------===//
// C++ Declarations
//
Decl *ActOnStartLinkageSpecification(Scope *S,
                                     SourceLocation ExternLoc,
                                     Expr *LangStr,
                                     SourceLocation LBraceLoc);
Decl *ActOnFinishLinkageSpecification(Scope *S,
                                      Decl *LinkageSpec,
                                      SourceLocation RBraceLoc);


//===--------------------------------------------------------------------===//
// C++ Classes
//
bool isCurrentClassName(const IdentifierInfo &II, Scope *S,
                        const CXXScopeSpec *SS = nullptr);
bool isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS);

bool ActOnAccessSpecifier(AccessSpecifier Access,
                          SourceLocation ASLoc,
                          SourceLocation ColonLoc,
                          AttributeList *Attrs = nullptr);

NamedDecl *ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS,
                               Declarator &D,
                               MultiTemplateParamsArg TemplateParameterLists,
                               Expr *BitfieldWidth, const VirtSpecifiers &VS,
                               InClassInitStyle InitStyle);

void ActOnStartCXXInClassMemberInitializer();
void ActOnFinishCXXInClassMemberInitializer(Decl *VarDecl,
                                            SourceLocation EqualLoc,
                                            Expr *Init);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  SourceLocation LParenLoc,
                                  ArrayRef<Expr *> Args,
                                  SourceLocation RParenLoc,
                                  SourceLocation EllipsisLoc);

MemInitResult ActOnMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *InitList,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemInitializer(Decl *ConstructorD,
                                  Scope *S,
                                  CXXScopeSpec &SS,
                                  IdentifierInfo *MemberOrBase,
                                  ParsedType TemplateTypeTy,
                                  const DeclSpec &DS,
                                  SourceLocation IdLoc,
                                  Expr *Init,
                                  SourceLocation EllipsisLoc);

MemInitResult BuildMemberInitializer(ValueDecl *Member,
                                     Expr *Init,
                                     SourceLocation IdLoc);

MemInitResult BuildBaseInitializer(QualType BaseType,
                                   TypeSourceInfo *BaseTInfo,
                                   Expr *Init,
                                   CXXRecordDecl *ClassDecl,
                                   SourceLocation EllipsisLoc);

MemInitResult BuildDelegatingInitializer(TypeSourceInfo *TInfo,
                                         Expr *Init,
                                         CXXRecordDecl *ClassDecl);

bool SetDelegatingInitializer(CXXConstructorDecl *Constructor,
                              CXXCtorInitializer *Initializer);

bool SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors,
                         ArrayRef<CXXCtorInitializer *> Initializers = None);

void SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation);


/// MarkBaseAndMemberDestructorsReferenced - Given a record decl,
/// mark all the non-trivial destructors of its members and bases as
/// referenced.
void MarkBaseAndMemberDestructorsReferenced(SourceLocation Loc,
                                            CXXRecordDecl *Record);

/// \brief The list of classes whose vtables have been used within
/// this translation unit, and the source locations at which the
/// first use occurred.
typedef std::pair<CXXRecordDecl*, SourceLocation> VTableUse;

/// \brief The list of vtables that are required but have not yet been
/// materialized.
SmallVector<VTableUse, 16> VTableUses;

/// \brief The set of classes whose vtables have been used within
/// this translation unit, and a bit that will be true if the vtable is
/// required to be emitted (otherwise, it should be emitted only if needed
/// by code generation).
llvm::DenseMap<CXXRecordDecl *, bool> VTablesUsed;

/// \brief Load any externally-stored vtable uses.
void LoadExternalVTableUses();

/// \brief Note that the vtable for the given class was used at the
/// given location.
void MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
                    bool DefinitionRequired = false);

/// \brief Mark the exception specifications of all virtual member functions
/// in the given class as needed.
void MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc,
                                           const CXXRecordDecl *RD);

/// MarkVirtualMembersReferenced - Will mark all members of the given
/// CXXRecordDecl referenced.
void MarkVirtualMembersReferenced(SourceLocation Loc,
                                  const CXXRecordDecl *RD);

/// \brief Define all of the vtables that have been used in this
/// translation unit and reference any virtual members used by those
/// vtables.
///
/// \returns true if any work was done, false otherwise.
bool DefineUsedVTables();

void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl);

void ActOnMemInitializers(Decl *ConstructorDecl,
                          SourceLocation ColonLoc,
                          ArrayRef<CXXCtorInitializer*> MemInits,
                          bool AnyErrors);

/// \brief Check class-level dllimport/dllexport attribute. The caller must
/// ensure that referenceDLLExportedClassMethods is called some point later
/// when all outer classes of Class are complete.
void checkClassLevelDLLAttribute(CXXRecordDecl *Class);

void referenceDLLExportedClassMethods();

void propagateDLLAttrToBaseClassTemplate(
    CXXRecordDecl *Class, Attr *ClassAttr,
    ClassTemplateSpecializationDecl *BaseTemplateSpec,
    SourceLocation BaseLoc);

void CheckCompletedCXXClass(CXXRecordDecl *Record);

/// Check that the C++ class annoated with "trivial_abi" satisfies all the
/// conditions that are needed for the attribute to have an effect.
void checkIllFormedTrivialABIStruct(CXXRecordDecl &RD);

void ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
                                       Decl *TagDecl,
                                       SourceLocation LBrac,
                                       SourceLocation RBrac,
                                       AttributeList *AttrList);
void ActOnFinishCXXMemberDecls();
void ActOnFinishCXXNonNestedClass(Decl *D);

void ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param);
unsigned ActOnReenterTemplateScope(Scope *S, Decl *Template);
void ActOnStartDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnDelayedCXXMethodParameter(Scope *S, Decl *Param);
void ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *Record);
void ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
void ActOnFinishDelayedMemberInitializers(Decl *Record);
void MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD,
                              CachedTokens &Toks);
void UnmarkAsLateParsedTemplate(FunctionDecl *FD);
bool IsInsideALocalClassWithinATemplateFunction();

Decl *ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   Expr *AssertMessageExpr,
                                   SourceLocation RParenLoc);
Decl *BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc,
                                   Expr *AssertExpr,
                                   StringLiteral *AssertMessageExpr,
                                   SourceLocation RParenLoc,
                                   bool Failed);

FriendDecl *CheckFriendTypeDecl(SourceLocation LocStart,
                                SourceLocation FriendLoc,
                                TypeSourceInfo *TSInfo);
Decl *ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
                          MultiTemplateParamsArg TemplateParams);
NamedDecl *ActOnFriendFunctionDecl(Scope *S, Declarator &D,
                                   MultiTemplateParamsArg TemplateParams);

QualType CheckConstructorDeclarator(Declarator &D, QualType R,
                                    StorageClass& SC);
void CheckConstructor(CXXConstructorDecl *Constructor);
QualType CheckDestructorDeclarator(Declarator &D, QualType R,
                                   StorageClass& SC);
bool CheckDestructor(CXXDestructorDecl *Destructor);
void CheckConversionDeclarator(Declarator &D, QualType &R,
                               StorageClass& SC);
Decl *ActOnConversionDeclarator(CXXConversionDecl *Conversion);
void CheckDeductionGuideDeclarator(Declarator &D, QualType &R,
                                   StorageClass &SC);
void CheckDeductionGuideTemplate(FunctionTemplateDecl *TD);

void CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD);
void CheckExplicitlyDefaultedMemberExceptionSpec(CXXMethodDecl *MD,
                                                 const FunctionProtoType *T);
void CheckDelayedMemberExceptionSpecs();

//===--------------------------------------------------------------------===//
// C++ Derived Classes
//

/// ActOnBaseSpecifier - Parsed a base specifier
CXXBaseSpecifier *CheckBaseSpecifier(CXXRecordDecl *Class,
                                     SourceRange SpecifierRange,
                                     bool Virtual, AccessSpecifier Access,
                                     TypeSourceInfo *TInfo,
                                     SourceLocation EllipsisLoc);

BaseResult ActOnBaseSpecifier(Decl *classdecl,
                              SourceRange SpecifierRange,
                              ParsedAttributes &Attrs,
                              bool Virtual, AccessSpecifier Access,
                              ParsedType basetype,
                              SourceLocation BaseLoc,
                              SourceLocation EllipsisLoc);

bool AttachBaseSpecifiers(CXXRecordDecl *Class,
                          MutableArrayRef<CXXBaseSpecifier *> Bases);
void ActOnBaseSpecifiers(Decl *ClassDecl,
                         MutableArrayRef<CXXBaseSpecifier *> Bases);

bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base);
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base,
                   CXXBasePaths &Paths);

// FIXME: I don't like this name.
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath);

bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  SourceLocation Loc, SourceRange Range,
                                  CXXCastPath *BasePath = nullptr,
                                  bool IgnoreAccess = false);
bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
                                  unsigned InaccessibleBaseID,
                                  unsigned AmbigiousBaseConvID,
                                  SourceLocation Loc, SourceRange Range,
                                  DeclarationName Name,
                                  CXXCastPath *BasePath,
                                  bool IgnoreAccess = false);

std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths);

bool CheckOverridingFunctionAttributes(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionReturnType - Checks whether the return types are
/// covariant, according to C++ [class.virtual]p5.
bool CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
                                       const CXXMethodDecl *Old);

/// CheckOverridingFunctionExceptionSpec - Checks whether the exception
/// spec is a subset of base spec.
bool CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
                                          const CXXMethodDecl *Old);

bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange);

/// CheckOverrideControl - Check C++11 override control semantics.
void CheckOverrideControl(NamedDecl *D);

/// DiagnoseAbsenceOfOverrideControl - Diagnose if 'override' keyword was
/// not used in the declaration of an overriding method.
void DiagnoseAbsenceOfOverrideControl(NamedDecl *D);

/// CheckForFunctionMarkedFinal - Checks whether a virtual member function
/// overrides a virtual member function marked 'final', according to
/// C++11 [class.virtual]p4.
bool CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
                                            const CXXMethodDecl *Old);


//===--------------------------------------------------------------------===//
// C++ Access Control
//

enum AccessResult {
  AR_accessible,
  AR_inaccessible,
  AR_dependent,
  AR_delayed
};

bool SetMemberAccessSpecifier(NamedDecl *MemberDecl,
                              NamedDecl *PrevMemberDecl,
                              AccessSpecifier LexicalAS);

AccessResult CheckUnresolvedMemberAccess(UnresolvedMemberExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckUnresolvedLookupAccess(UnresolvedLookupExpr *E,
                                         DeclAccessPair FoundDecl);
AccessResult CheckAllocationAccess(SourceLocation OperatorLoc,
                                   SourceRange PlacementRange,
                                   CXXRecordDecl *NamingClass,
                                   DeclAccessPair FoundDecl,
                                   bool Diagnose = true);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    bool IsCopyBindingRefToTemp = false);
AccessResult CheckConstructorAccess(SourceLocation Loc,
                                    CXXConstructorDecl *D,
                                    DeclAccessPair FoundDecl,
                                    const InitializedEntity &Entity,
                                    const PartialDiagnostic &PDiag);
AccessResult CheckDestructorAccess(SourceLocation Loc,
                                   CXXDestructorDecl *Dtor,
                                   const PartialDiagnostic &PDiag,
                                   QualType objectType = QualType());
AccessResult CheckFriendAccess(NamedDecl *D);
AccessResult CheckMemberAccess(SourceLocation UseLoc,
                               CXXRecordDecl *NamingClass,
                               DeclAccessPair Found);
AccessResult CheckMemberOperatorAccess(SourceLocation Loc,
                                       Expr *ObjectExpr,
                                       Expr *ArgExpr,
                                       DeclAccessPair FoundDecl);
AccessResult CheckAddressOfMemberAccess(Expr *OvlExpr,
                                        DeclAccessPair FoundDecl);
AccessResult CheckBaseClassAccess(SourceLocation AccessLoc,
                                  QualType Base, QualType Derived,
                                  const CXXBasePath &Path,
                                  unsigned DiagID,
                                  bool ForceCheck = false,
                                  bool ForceUnprivileged = false);
void CheckLookupAccess(const LookupResult &R);
bool IsSimplyAccessible(NamedDecl *decl, DeclContext *Ctx);
bool isSpecialMemberAccessibleForDeletion(CXXMethodDecl *decl,
                                          AccessSpecifier access,
                                          QualType objectType);

void HandleDependentAccessCheck(const DependentDiagnostic &DD,
                       const MultiLevelTemplateArgumentList &TemplateArgs);
void PerformDependentDiagnostics(const DeclContext *Pattern,
                      const MultiLevelTemplateArgumentList &TemplateArgs);

void HandleDelayedAccessCheck(sema::DelayedDiagnostic &DD, Decl *Ctx);

/// \brief When true, access checking violations are treated as SFINAE
/// failures rather than hard errors.
bool AccessCheckingSFINAE;

enum AbstractDiagSelID {
  AbstractNone = -1,
  AbstractReturnType,
  AbstractParamType,
  AbstractVariableType,
  AbstractFieldType,
  AbstractIvarType,
  AbstractSynthesizedIvarType,
  AbstractArrayType
};

bool isAbstractType(SourceLocation Loc, QualType T);
bool RequireNonAbstractType(SourceLocation Loc, QualType T,
                            TypeDiagnoser &Diagnoser);
template <typename... Ts>
bool RequireNonAbstractType(SourceLocation Loc, QualType T, unsigned DiagID,
                            const Ts &...Args) {
  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
  return RequireNonAbstractType(Loc, T, Diagnoser);
}

void DiagnoseAbstractType(const CXXRecordDecl *RD);

//===--------------------------------------------------------------------===//
// C++ Overloaded Operators [C++ 13.5]
//

bool CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl);

bool CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl);

//===--------------------------------------------------------------------===//
// C++ Templates [C++ 14]
//
void FilterAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true);
bool hasAnyAcceptableTemplateNames(LookupResult &R,
                                   bool AllowFunctionTemplates = true);

void LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS,
                        QualType ObjectType, bool EnteringContext,
                        bool &MemberOfUnknownSpecialization);

TemplateNameKind isTemplateName(Scope *S,
                                CXXScopeSpec &SS,
                                bool hasTemplateKeyword,
                                UnqualifiedId &Name,
                                ParsedType ObjectType,
                                bool EnteringContext,
                                TemplateTy &Template,
                                bool &MemberOfUnknownSpecialization);

/// Determine whether a particular identifier might be the name in a C++1z
/// deduction-guide declaration.
bool isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
                          SourceLocation NameLoc,
                          ParsedTemplateTy *Template = nullptr);

bool DiagnoseUnknownTemplateName(const IdentifierInfo &II,
                                 SourceLocation IILoc,
                                 Scope *S,
                                 const CXXScopeSpec *SS,
                                 TemplateTy &SuggestedTemplate,
                                 TemplateNameKind &SuggestedKind);

bool DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
                                    NamedDecl *Instantiation,
                                    bool InstantiatedFromMember,
                                    const NamedDecl *Pattern,
                                    const NamedDecl *PatternDef,
                                    TemplateSpecializationKind TSK,
                                    bool Complain = true);

void DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl);
TemplateDecl *AdjustDeclIfTemplate(Decl *&Decl);

NamedDecl *ActOnTypeParameter(Scope *S, bool Typename,
                         SourceLocation EllipsisLoc,
                         SourceLocation KeyLoc,
                         IdentifierInfo *ParamName,
                         SourceLocation ParamNameLoc,
                         unsigned Depth, unsigned Position,
                         SourceLocation EqualLoc,
                         ParsedType DefaultArg);

QualType CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
                                           SourceLocation Loc);
QualType CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc);

NamedDecl *ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
                                    unsigned Depth,
                                    unsigned Position,
                                    SourceLocation EqualLoc,
                                    Expr *DefaultArg);
NamedDecl *ActOnTemplateTemplateParameter(Scope *S,
                                     SourceLocation TmpLoc,
                                     TemplateParameterList *Params,
                                     SourceLocation EllipsisLoc,
                                     IdentifierInfo *ParamName,
                                     SourceLocation ParamNameLoc,
                                     unsigned Depth,
                                     unsigned Position,
                                     SourceLocation EqualLoc,
                                     ParsedTemplateArgument DefaultArg);

TemplateParameterList *
ActOnTemplateParameterList(unsigned Depth,
                           SourceLocation ExportLoc,
                           SourceLocation TemplateLoc,
                           SourceLocation LAngleLoc,
                           ArrayRef<NamedDecl *> Params,
                           SourceLocation RAngleLoc,
                           Expr *RequiresClause);

/// \brief The context in which we are checking a template parameter list.
enum TemplateParamListContext {
  TPC_ClassTemplate,
  TPC_VarTemplate,
  TPC_FunctionTemplate,
  TPC_ClassTemplateMember,
  TPC_FriendClassTemplate,
  TPC_FriendFunctionTemplate,
  TPC_FriendFunctionTemplateDefinition,
  TPC_TypeAliasTemplate
};

bool CheckTemplateParameterList(TemplateParameterList *NewParams,
                                TemplateParameterList *OldParams,
                                TemplateParamListContext TPC);
TemplateParameterList *MatchTemplateParametersToScopeSpecifier(
    SourceLocation DeclStartLoc, SourceLocation DeclLoc,
    const CXXScopeSpec &SS, TemplateIdAnnotation *TemplateId,
    ArrayRef<TemplateParameterList *> ParamLists,
    bool IsFriend, bool &IsMemberSpecialization, bool &Invalid);

DeclResult CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
                              SourceLocation KWLoc, CXXScopeSpec &SS,
                              IdentifierInfo *Name, SourceLocation NameLoc,
                              AttributeList *Attr,
                              TemplateParameterList *TemplateParams,
                              AccessSpecifier AS,
                              SourceLocation ModulePrivateLoc,
                              SourceLocation FriendLoc,
                              unsigned NumOuterTemplateParamLists,
                          TemplateParameterList **OuterTemplateParamLists,
                              SkipBodyInfo *SkipBody = nullptr);

TemplateArgumentLoc getTrivialTemplateArgumentLoc(const TemplateArgument &Arg,
                                                  QualType NTTPType,
                                                  SourceLocation Loc);

void translateTemplateArguments(const ASTTemplateArgsPtr &In,
                                TemplateArgumentListInfo &Out);

ParsedTemplateArgument ActOnTemplateTypeArgument(TypeResult ParsedType);

void NoteAllFoundTemplates(TemplateName Name);

QualType CheckTemplateIdType(TemplateName Template,
                             SourceLocation TemplateLoc,
                            TemplateArgumentListInfo &TemplateArgs);

TypeResult
ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
                    TemplateTy Template, IdentifierInfo *TemplateII,
                    SourceLocation TemplateIILoc,
                    SourceLocation LAngleLoc,
                    ASTTemplateArgsPtr TemplateArgs,
                    SourceLocation RAngleLoc,
                    bool IsCtorOrDtorName = false,
                    bool IsClassName = false);

/// \brief Parsed an elaborated-type-specifier that refers to a template-id,
/// such as \c class T::template apply<U>.
TypeResult ActOnTagTemplateIdType(TagUseKind TUK,
                                  TypeSpecifierType TagSpec,
                                  SourceLocation TagLoc,
                                  CXXScopeSpec &SS,
                                  SourceLocation TemplateKWLoc,
                                  TemplateTy TemplateD,
                                  SourceLocation TemplateLoc,
                                  SourceLocation LAngleLoc,
                                  ASTTemplateArgsPtr TemplateArgsIn,
                                  SourceLocation RAngleLoc);

DeclResult ActOnVarTemplateSpecialization(
    Scope *S, Declarator &D, TypeSourceInfo *DI,
    SourceLocation TemplateKWLoc, TemplateParameterList *TemplateParams,
    StorageClass SC, bool IsPartialSpecialization);

DeclResult CheckVarTemplateId(VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              SourceLocation TemplateNameLoc,
                              const TemplateArgumentListInfo &TemplateArgs);

ExprResult CheckVarTemplateId(const CXXScopeSpec &SS,
                              const DeclarationNameInfo &NameInfo,
                              VarTemplateDecl *Template,
                              SourceLocation TemplateLoc,
                              const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildTemplateIdExpr(const CXXScopeSpec &SS,
                               SourceLocation TemplateKWLoc,
                               LookupResult &R,
                               bool RequiresADL,
                             const TemplateArgumentListInfo *TemplateArgs);

ExprResult BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
                                        SourceLocation TemplateKWLoc,
                             const DeclarationNameInfo &NameInfo,
                             const TemplateArgumentListInfo *TemplateArgs);

TemplateNameKind ActOnDependentTemplateName(
    Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
    UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext,
    TemplateTy &Template, bool AllowInjectedClassName = false);

DeclResult
ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec, TagUseKind TUK,
                                 SourceLocation KWLoc,
                                 SourceLocation ModulePrivateLoc,
                                 TemplateIdAnnotation &TemplateId,
                                 AttributeList *Attr,
                               MultiTemplateParamsArg TemplateParameterLists,
                                 SkipBodyInfo *SkipBody = nullptr);

bool CheckTemplatePartialSpecializationArgs(SourceLocation Loc,
                                            TemplateDecl *PrimaryTemplate,
                                            unsigned NumExplicitArgs,
                                            ArrayRef<TemplateArgument> Args);
void CheckTemplatePartialSpecialization(
    ClassTemplatePartialSpecializationDecl *Partial);
void CheckTemplatePartialSpecialization(
    VarTemplatePartialSpecializationDecl *Partial);

Decl *ActOnTemplateDeclarator(Scope *S,
                              MultiTemplateParamsArg TemplateParameterLists,
                              Declarator &D);

bool
CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
                                       TemplateSpecializationKind NewTSK,
                                       NamedDecl *PrevDecl,
                                       TemplateSpecializationKind PrevTSK,
                                       SourceLocation PrevPtOfInstantiation,
                                       bool &SuppressNew);

bool CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
                  const TemplateArgumentListInfo &ExplicitTemplateArgs,
                                                  LookupResult &Previous);

bool CheckFunctionTemplateSpecialization(FunctionDecl *FD,
                       TemplateArgumentListInfo *ExplicitTemplateArgs,
                                         LookupResult &Previous);
bool CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous);
void CompleteMemberSpecialization(NamedDecl *Member, LookupResult &Previous);

DeclResult
ActOnExplicitInstantiation(Scope *S,
                           SourceLocation ExternLoc,
                           SourceLocation TemplateLoc,
                           unsigned TagSpec,
                           SourceLocation KWLoc,
                           const CXXScopeSpec &SS,
                           TemplateTy Template,
                           SourceLocation TemplateNameLoc,
                           SourceLocation LAngleLoc,
                           ASTTemplateArgsPtr TemplateArgs,
                           SourceLocation RAngleLoc,
                           AttributeList *Attr);

DeclResult
ActOnExplicitInstantiation(Scope *S,
                           SourceLocation ExternLoc,
                           SourceLocation TemplateLoc,
                           unsigned TagSpec,
                           SourceLocation KWLoc,
                           CXXScopeSpec &SS,
                           IdentifierInfo *Name,
                           SourceLocation NameLoc,
                           AttributeList *Attr);

DeclResult ActOnExplicitInstantiation(Scope *S,
                                      SourceLocation ExternLoc,
                                      SourceLocation TemplateLoc,
                                      Declarator &D);

TemplateArgumentLoc
SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
                                        SourceLocation TemplateLoc,
                                        SourceLocation RAngleLoc,
                                        Decl *Param,
                                        SmallVectorImpl<TemplateArgument>
                                          &Converted,
                                        bool &HasDefaultArg);

/// \brief Specifies the context in which a particular template
/// argument is being checked.
enum CheckTemplateArgumentKind {
  /// \brief The template argument was specified in the code or was
  /// instantiated with some deduced template arguments.
  CTAK_Specified,

  /// \brief The template argument was deduced via template argument
  /// deduction.
  CTAK_Deduced,

  /// \brief The template argument was deduced from an array bound
  /// via template argument deduction.
  CTAK_DeducedFromArrayBound
};

bool CheckTemplateArgument(NamedDecl *Param,
                           TemplateArgumentLoc &Arg,
                           NamedDecl *Template,
                           SourceLocation TemplateLoc,
                           SourceLocation RAngleLoc,
                           unsigned ArgumentPackIndex,
                         SmallVectorImpl<TemplateArgument> &Converted,
                           CheckTemplateArgumentKind CTAK = CTAK_Specified);

/// \brief Check that the given template arguments can be be provided to
/// the given template, converting the arguments along the way.
///
/// \param Template The template to which the template arguments are being
/// provided.
///
/// \param TemplateLoc The location of the template name in the source.
///
/// \param TemplateArgs The list of template arguments. If the template is
/// a template template parameter, this function may extend the set of
/// template arguments to also include substituted, defaulted template
/// arguments.
///
/// \param PartialTemplateArgs True if the list of template arguments is
/// intentionally partial, e.g., because we're checking just the initial
/// set of template arguments.
///
/// \param Converted Will receive the converted, canonicalized template
/// arguments.
///
/// \param UpdateArgsWithConversions If \c true, update \p TemplateArgs to
/// contain the converted forms of the template arguments as written.
/// Otherwise, \p TemplateArgs will not be modified.
///
/// \returns true if an error occurred, false otherwise.
bool CheckTemplateArgumentList(TemplateDecl *Template,
                               SourceLocation TemplateLoc,
                               TemplateArgumentListInfo &TemplateArgs,
                               bool PartialTemplateArgs,
                               SmallVectorImpl<TemplateArgument> &Converted,
                               bool UpdateArgsWithConversions = true);

bool CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
                               TemplateArgumentLoc &Arg,
                         SmallVectorImpl<TemplateArgument> &Converted);

bool CheckTemplateArgument(TemplateTypeParmDecl *Param,
                           TypeSourceInfo *Arg);
ExprResult CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
                                 QualType InstantiatedParamType, Expr *Arg,
                                 TemplateArgument &Converted,
                             CheckTemplateArgumentKind CTAK = CTAK_Specified);
bool CheckTemplateArgument(TemplateTemplateParmDecl *Param,
                           TemplateArgumentLoc &Arg,
                           unsigned ArgumentPackIndex);

ExprResult
BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
                                        QualType ParamType,
                                        SourceLocation Loc);
ExprResult
BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
                                            SourceLocation Loc);

/// \brief Enumeration describing how template parameter lists are compared
/// for equality.
enum TemplateParameterListEqualKind {
  /// \brief We are matching the template parameter lists of two templates
  /// that might be redeclarations.
  ///
  /// \code
  /// template<typename T> struct X;
  /// template<typename T> struct X;
  /// \endcode
  TPL_TemplateMatch,

  /// \brief We are matching the template parameter lists of two template
  /// template parameters as part of matching the template parameter lists
  /// of two templates that might be redeclarations.
  ///
  /// \code
  /// template<template<int I> class TT> struct X;
  /// template<template<int Value> class Other> struct X;
  /// \endcode
  TPL_TemplateTemplateParmMatch,

  /// \brief We are matching the template parameter lists of a template
  /// template argument against the template parameter lists of a template
  /// template parameter.
  ///
  /// \code
  /// template<template<int Value> class Metafun> struct X;
  /// template<int Value> struct integer_c;
  /// X<integer_c> xic;
  /// \endcode
  TPL_TemplateTemplateArgumentMatch
};

bool TemplateParameterListsAreEqual(TemplateParameterList *New,
                                    TemplateParameterList *Old,
                                    bool Complain,
                                    TemplateParameterListEqualKind Kind,
                                    SourceLocation TemplateArgLoc
                                      = SourceLocation());

bool CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams);

/// \brief Called when the parser has parsed a C++ typename
/// specifier, e.g., "typename T::type".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param II the identifier we're retrieving (e.g., 'type' in the example).
/// \param IdLoc the location of the identifier.
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS, const IdentifierInfo &II,
                  SourceLocation IdLoc);

/// \brief Called when the parser has parsed a C++ typename
/// specifier that ends in a template-id, e.g.,
/// "typename MetaFun::template apply<T1, T2>".
///
/// \param S The scope in which this typename type occurs.
/// \param TypenameLoc the location of the 'typename' keyword
/// \param SS the nested-name-specifier following the typename (e.g., 'T::').
/// \param TemplateLoc the location of the 'template' keyword, if any.
/// \param TemplateName The template name.
/// \param TemplateII The identifier used to name the template.
/// \param TemplateIILoc The location of the template name.
/// \param LAngleLoc The location of the opening angle bracket  ('<').
/// \param TemplateArgs The template arguments.
/// \param RAngleLoc The location of the closing angle bracket  ('>').
TypeResult
ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
                  const CXXScopeSpec &SS,
                  SourceLocation TemplateLoc,
                  TemplateTy TemplateName,
                  IdentifierInfo *TemplateII,
                  SourceLocation TemplateIILoc,
                  SourceLocation LAngleLoc,
                  ASTTemplateArgsPtr TemplateArgs,
                  SourceLocation RAngleLoc);

QualType CheckTypenameType(ElaboratedTypeKeyword Keyword,
                           SourceLocation KeywordLoc,
                           NestedNameSpecifierLoc QualifierLoc,
                           const IdentifierInfo &II,
                           SourceLocation IILoc);

TypeSourceInfo *RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
                                                  SourceLocation Loc,
                                                  DeclarationName Name);
bool RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS);

ExprResult RebuildExprInCurrentInstantiation(Expr *E);
bool RebuildTemplateParamsInCurrentInstantiation(
                                              TemplateParameterList *Params);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgumentList &Args);

std::string
getTemplateArgumentBindingsText(const TemplateParameterList *Params,
                                const TemplateArgument *Args,
                                unsigned NumArgs);

//===--------------------------------------------------------------------===//
// C++ Variadic Templates (C++0x [temp.variadic])
//===--------------------------------------------------------------------===//

/// Determine whether an unexpanded parameter pack might be permitted in this
/// location. Useful for error recovery.
bool isUnexpandedParameterPackPermitted();

/// \brief The context in which an unexpanded parameter pack is
/// being diagnosed.
///
/// Note that the values of this enumeration line up with the first
/// argument to the \c err_unexpanded_parameter_pack diagnostic.
enum UnexpandedParameterPackContext {
  /// \brief An arbitrary expression.
  UPPC_Expression = 0,

  /// \brief The base type of a class type.
  UPPC_BaseType,

  /// \brief The type of an arbitrary declaration.
  UPPC_DeclarationType,

  /// \brief The type of a data member.
  UPPC_DataMemberType,

  /// \brief The size of a bit-field.
  UPPC_BitFieldWidth,

  /// \brief The expression in a static assertion.
  UPPC_StaticAssertExpression,

  /// \brief The fixed underlying type of an enumeration.
  UPPC_FixedUnderlyingType,

  /// \brief The enumerator value.
  UPPC_EnumeratorValue,

  /// \brief A using declaration.
  UPPC_UsingDeclaration,

  /// \brief A friend declaration.
  UPPC_FriendDeclaration,

  /// \brief A declaration qualifier.
  UPPC_DeclarationQualifier,

  /// \brief An initializer.
  UPPC_Initializer,

  /// \brief A default argument.
  UPPC_DefaultArgument,

  /// \brief The type of a non-type template parameter.
  UPPC_NonTypeTemplateParameterType,

  /// \brief The type of an exception.
  UPPC_ExceptionType,

  /// \brief Partial specialization.
  UPPC_PartialSpecialization,

  /// \brief Microsoft __if_exists.
  UPPC_IfExists,

  /// \brief Microsoft __if_not_exists.
  UPPC_IfNotExists,

  /// \brief Lambda expression.
  UPPC_Lambda,

  /// \brief Block expression,
  UPPC_Block
};

/// \brief Diagnose unexpanded parameter packs.
///
/// \param Loc The location at which we should emit the diagnostic.
///
/// \param UPPC The context in which we are diagnosing unexpanded
/// parameter packs.
///
/// \param Unexpanded the set of unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPacks(SourceLocation Loc,
                                      UnexpandedParameterPackContext UPPC,
                                ArrayRef<UnexpandedParameterPack> Unexpanded);

/// \brief If the given type contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The source location where a diagnostc should be emitted.
///
/// \param T The type that is being checked for unexpanded parameter
/// packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc, TypeSourceInfo *T,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given expression contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param E The expression that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(Expr *E,
                     UnexpandedParameterPackContext UPPC = UPPC_Expression);

/// \brief If the given nested-name-specifier contains an unexpanded
/// parameter pack, diagnose the error.
///
/// \param SS The nested-name-specifier that is being checked for
/// unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const CXXScopeSpec &SS,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param NameInfo The name (with source location information) that
/// is being checked for unexpanded parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(const DeclarationNameInfo &NameInfo,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given template name contains an unexpanded parameter pack,
/// diagnose the error.
///
/// \param Loc The location of the template name.
///
/// \param Template The template name that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(SourceLocation Loc,
                                     TemplateName Template,
                                     UnexpandedParameterPackContext UPPC);

/// \brief If the given template argument contains an unexpanded parameter
/// pack, diagnose the error.
///
/// \param Arg The template argument that is being checked for unexpanded
/// parameter packs.
///
/// \returns true if an error occurred, false otherwise.
bool DiagnoseUnexpandedParameterPack(TemplateArgumentLoc Arg,
                                     UnexpandedParameterPackContext UPPC);

/// \brief Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgument Arg,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// template argument.
///
/// \param Arg The template argument that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TemplateArgumentLoc Arg,
                  SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param T The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(QualType T,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// type.
///
/// \param TL The type that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(TypeLoc TL,
                 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// nested-name-specifier.
///
/// \param NNS The nested-name-specifier that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(NestedNameSpecifierLoc NNS,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Collect the set of unexpanded parameter packs within the given
/// name.
///
/// \param NameInfo The name that will be traversed to find
/// unexpanded parameter packs.
void collectUnexpandedParameterPacks(const DeclarationNameInfo &NameInfo,
                       SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);

/// \brief Invoked when parsing a template argument followed by an
/// ellipsis, which creates a pack expansion.
///
/// \param Arg The template argument preceding the ellipsis, which
/// may already be invalid.
///
/// \param EllipsisLoc The location of the ellipsis.
ParsedTemplateArgument ActOnPackExpansion(const ParsedTemplateArgument &Arg,
                                          SourceLocation EllipsisLoc);

/// \brief Invoked when parsing a type followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Type The type preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
TypeResult ActOnPackExpansion(ParsedType Type, SourceLocation EllipsisLoc);

/// \brief Construct a pack expansion type from the pattern of the pack
/// expansion.
TypeSourceInfo *CheckPackExpansion(TypeSourceInfo *Pattern,
                                   SourceLocation EllipsisLoc,
                                   Optional<unsigned> NumExpansions);

/// \brief Construct a pack expansion type from the pattern of the pack
/// expansion.
QualType CheckPackExpansion(QualType Pattern,
                            SourceRange PatternRange,
                            SourceLocation EllipsisLoc,
                            Optional<unsigned> NumExpansions);

/// \brief Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult ActOnPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc);

/// \brief Invoked when parsing an expression followed by an ellipsis, which
/// creates a pack expansion.
///
/// \param Pattern The expression preceding the ellipsis, which will become
/// the pattern of the pack expansion.
///
/// \param EllipsisLoc The location of the ellipsis.
ExprResult CheckPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc,
                              Optional<unsigned> NumExpansions);

/// \brief Determine whether we could expand a pack expansion with the
/// given set of parameter packs into separate arguments by repeatedly
/// transforming the pattern.
///
/// \param EllipsisLoc The location of the ellipsis that identifies the
/// pack expansion.
///
/// \param PatternRange The source range that covers the entire pattern of
/// the pack expansion.
///
/// \param Unexpanded The set of unexpanded parameter packs within the
/// pattern.
///
/// \param ShouldExpand Will be set to \c true if the transformer should
/// expand the corresponding pack expansions into separate arguments. When
/// set, \c NumExpansions must also be set.
///
/// \param RetainExpansion Whether the caller should add an unexpanded
/// pack expansion after all of the expanded arguments. This is used
/// when extending explicitly-specified template argument packs per
/// C++0x [temp.arg.explicit]p9.
///
/// \param NumExpansions The number of separate arguments that will be in
/// the expanded form of the corresponding pack expansion. This is both an
/// input and an output parameter, which can be set by the caller if the
/// number of expansions is known a priori (e.g., due to a prior substitution)
/// and will be set by the callee when the number of expansions is known.
/// The callee must set this value when \c ShouldExpand is \c true; it may
/// set this value in other cases.
///
/// \returns true if an error occurred (e.g., because the parameter packs
/// are to be instantiated with arguments of different lengths), false
/// otherwise. If false, \c ShouldExpand (and possibly \c NumExpansions)
/// must be set.
bool CheckParameterPacksForExpansion(SourceLocation EllipsisLoc,
                                     SourceRange PatternRange,
                           ArrayRef<UnexpandedParameterPack> Unexpanded,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                                     bool &ShouldExpand,
                                     bool &RetainExpansion,
                                     Optional<unsigned> &NumExpansions);

/// \brief Determine the number of arguments in the given pack expansion
/// type.
///
/// This routine assumes that the number of arguments in the expansion is
/// consistent across all of the unexpanded parameter packs in its pattern.
///
/// Returns an empty Optional if the type can't be expanded.
Optional<unsigned> getNumArgumentsInExpansion(QualType T,
    const MultiLevelTemplateArgumentList &TemplateArgs);

/// \brief Determine whether the given declarator contains any unexpanded
/// parameter packs.
///
/// This routine is used by the parser to disambiguate function declarators
/// with an ellipsis prior to the ')', e.g.,
///
/// \code
///   void f(T...);
/// \endcode
///
/// To determine whether we have an (unnamed) function parameter pack or
/// a variadic function.
///
/// \returns true if the declarator contains any unexpanded parameter packs,
/// false otherwise.
bool containsUnexpandedParameterPacks(Declarator &D);

/// \brief Returns the pattern of the pack expansion for a template argument.
///
/// \param OrigLoc The template argument to expand.
///
/// \param Ellipsis Will be set to the location of the ellipsis.
///
/// \param NumExpansions Will be set to the number of expansions that will
/// be generated from this pack expansion, if known a priori.
TemplateArgumentLoc getTemplateArgumentPackExpansionPattern(
    TemplateArgumentLoc OrigLoc,
    SourceLocation &Ellipsis,
    Optional<unsigned> &NumExpansions) const;

/// Given a template argument that contains an unexpanded parameter pack, but
/// which has already been substituted, attempt to determine the number of
/// elements that will be produced once this argument is fully-expanded.
///
/// This is intended for use when transforming 'sizeof...(Arg)' in order to
/// avoid actually expanding the pack where possible.
Optional<unsigned> getFullyPackExpandedSize(TemplateArgument Arg);

//===--------------------------------------------------------------------===//
// C++ Template Argument Deduction (C++ [temp.deduct])
//===--------------------------------------------------------------------===//

/// Adjust the type \p ArgFunctionType to match the calling convention,
/// noreturn, and optionally the exception specification of \p FunctionType.
/// Deduction often wants to ignore these properties when matching function
/// types.
QualType adjustCCAndNoReturn(QualType ArgFunctionType, QualType FunctionType,
                             bool AdjustExceptionSpec = false);

/// \brief Describes the result of template argument deduction.
///
/// The TemplateDeductionResult enumeration describes the result of
/// template argument deduction, as returned from
/// DeduceTemplateArguments(). The separate TemplateDeductionInfo
/// structure provides additional information about the results of
/// template argument deduction, e.g., the deduced template argument
/// list (if successful) or the specific template parameters or
/// deduced arguments that were involved in the failure.
enum TemplateDeductionResult {
  /// \brief Template argument deduction was successful.
  TDK_Success = 0,
  /// \brief The declaration was invalid; do nothing.
  TDK_Invalid,
  /// \brief Template argument deduction exceeded the maximum template
  /// instantiation depth (which has already been diagnosed).
  TDK_InstantiationDepth,
  /// \brief Template argument deduction did not deduce a value
  /// for every template parameter.
  TDK_Incomplete,
  /// \brief Template argument deduction produced inconsistent
  /// deduced values for the given template parameter.
  TDK_Inconsistent,
  /// \brief Template argument deduction failed due to inconsistent
  /// cv-qualifiers on a template parameter type that would
  /// otherwise be deduced, e.g., we tried to deduce T in "const T"
  /// but were given a non-const "X".
  TDK_Underqualified,
  /// \brief Substitution of the deduced template argument values
  /// resulted in an error.
  TDK_SubstitutionFailure,
  /// \brief After substituting deduced template arguments, a dependent
  /// parameter type did not match the corresponding argument.
  TDK_DeducedMismatch,
  /// \brief After substituting deduced template arguments, an element of
  /// a dependent parameter type did not match the corresponding element
  /// of the corresponding argument (when deducing from an initializer list).
  TDK_DeducedMismatchNested,
  /// \brief A non-depnedent component of the parameter did not match the
  /// corresponding component of the argument.
  TDK_NonDeducedMismatch,
  /// \brief When performing template argument deduction for a function
  /// template, there were too many call arguments.
  TDK_TooManyArguments,
  /// \brief When performing template argument deduction for a function
  /// template, there were too few call arguments.
  TDK_TooFewArguments,
  /// \brief The explicitly-specified template arguments were not valid
  /// template arguments for the given template.
  TDK_InvalidExplicitArguments,
  /// \brief Checking non-dependent argument conversions failed.
  TDK_NonDependentConversionFailure,
  /// \brief Deduction failed; that's all we know.
  TDK_MiscellaneousDeductionFailure,
  /// \brief CUDA Target attributes do not match.
  TDK_CUDATargetMismatch
};

TemplateDeductionResult
DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(VarTemplatePartialSpecializationDecl *Partial,
                        const TemplateArgumentList &TemplateArgs,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult SubstituteExplicitTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo &ExplicitTemplateArgs,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    SmallVectorImpl<QualType> &ParamTypes, QualType *FunctionType,
    sema::TemplateDeductionInfo &Info);

/// brief A function argument from which we performed template argument
// deduction for a call.
struct OriginalCallArg {
  OriginalCallArg(QualType OriginalParamType, bool DecomposedParam,
                  unsigned ArgIdx, QualType OriginalArgType)
      : OriginalParamType(OriginalParamType),
        DecomposedParam(DecomposedParam), ArgIdx(ArgIdx),
        OriginalArgType(OriginalArgType) {}

  QualType OriginalParamType;
  bool DecomposedParam;
  unsigned ArgIdx;
  QualType OriginalArgType;
};

TemplateDeductionResult FinishTemplateArgumentDeduction(
    FunctionTemplateDecl *FunctionTemplate,
    SmallVectorImpl<DeducedTemplateArgument> &Deduced,
    unsigned NumExplicitlySpecified, FunctionDecl *&Specialization,
    sema::TemplateDeductionInfo &Info,
    SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs = nullptr,
    bool PartialOverloading = false,
    llvm::function_ref<bool()> CheckNonDependent = []{ return false; });

TemplateDeductionResult DeduceTemplateArguments(
    FunctionTemplateDecl *FunctionTemplate,
    TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args,
    FunctionDecl *&Specialization, sema::TemplateDeductionInfo &Info,
    bool PartialOverloading,
    llvm::function_ref<bool(ArrayRef<QualType>)> CheckNonDependent);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        QualType ArgFunctionType,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        QualType ToType,
                        CXXConversionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info);

TemplateDeductionResult
DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
                        TemplateArgumentListInfo *ExplicitTemplateArgs,
                        FunctionDecl *&Specialization,
                        sema::TemplateDeductionInfo &Info,
                        bool IsAddressOfFunction = false);

/// \brief Substitute Replacement for \p auto in \p TypeWithAuto
QualType SubstAutoType(QualType TypeWithAuto, QualType Replacement);
/// \brief Substitute Replacement for auto in TypeWithAuto
TypeSourceInfo* SubstAutoTypeSourceInfo(TypeSourceInfo *TypeWithAuto,
                                        QualType Replacement);
/// \brief Completely replace the \c auto in \p TypeWithAuto by
/// \p Replacement. This does not retain any \c auto type sugar.
QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement);

/// \brief Result type of DeduceAutoType.
enum DeduceAutoResult {
  DAR_Succeeded,
  DAR_Failed,
  DAR_FailedAlreadyDiagnosed
};

DeduceAutoResult
DeduceAutoType(TypeSourceInfo *AutoType, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
DeduceAutoResult
DeduceAutoType(TypeLoc AutoTypeLoc, Expr *&Initializer, QualType &Result,
               Optional<unsigned> DependentDeductionDepth = None);
void DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init);
bool DeduceReturnType(FunctionDecl *FD, SourceLocation Loc,
                      bool Diagnose = true);

/// \brief Declare implicit deduction guides for a class template if we've
/// not already done so.
void DeclareImplicitDeductionGuides(TemplateDecl *Template,
                                    SourceLocation Loc);

QualType DeduceTemplateSpecializationFromInitializer(
    TypeSourceInfo *TInfo, const InitializedEntity &Entity,
    const InitializationKind &Kind, MultiExprArg Init);

QualType deduceVarTypeFromInitializer(VarDecl *VDecl, DeclarationName Name,
                                      QualType Type, TypeSourceInfo *TSI,
                                      SourceRange Range, bool DirectInit,
                                      Expr *Init);

TypeLoc getReturnTypeLoc(FunctionDecl *FD) const;

bool DeduceFunctionTypeFromReturnExpr(FunctionDecl *FD,
                                      SourceLocation ReturnLoc,
                                      Expr *&RetExpr, AutoType *AT);

FunctionTemplateDecl *getMoreSpecializedTemplate(FunctionTemplateDecl *FT1,
                                                 FunctionTemplateDecl *FT2,
                                                 SourceLocation Loc,
                                         TemplatePartialOrderingContext TPOC,
                                                 unsigned NumCallArguments1,
                                                 unsigned NumCallArguments2);
UnresolvedSetIterator
getMostSpecialized(UnresolvedSetIterator SBegin, UnresolvedSetIterator SEnd,
                   TemplateSpecCandidateSet &FailedCandidates,
                   SourceLocation Loc,
                   const PartialDiagnostic &NoneDiag,
                   const PartialDiagnostic &AmbigDiag,
                   const PartialDiagnostic &CandidateDiag,
                   bool Complain = true, QualType TargetType = QualType());

ClassTemplatePartialSpecializationDecl *
getMoreSpecializedPartialSpecialization(
                                ClassTemplatePartialSpecializationDecl *PS1,
                                ClassTemplatePartialSpecializationDecl *PS2,
                                SourceLocation Loc);

bool isMoreSpecializedThanPrimary(ClassTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

VarTemplatePartialSpecializationDecl *getMoreSpecializedPartialSpecialization(
    VarTemplatePartialSpecializationDecl *PS1,
    VarTemplatePartialSpecializationDecl *PS2, SourceLocation Loc);

bool isMoreSpecializedThanPrimary(VarTemplatePartialSpecializationDecl *T,
                                  sema::TemplateDeductionInfo &Info);

bool isTemplateTemplateParameterAtLeastAsSpecializedAs(
    TemplateParameterList *P, TemplateDecl *AArg, SourceLocation Loc);

void MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs,
                                bool OnlyDeduced,
                                unsigned Depth,
                                llvm::SmallBitVector &Used);
void MarkDeducedTemplateParameters(
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced) {
  return MarkDeducedTemplateParameters(Context, FunctionTemplate, Deduced);
}
static void MarkDeducedTemplateParameters(ASTContext &Ctx,
                                const FunctionTemplateDecl *FunctionTemplate,
                                llvm::SmallBitVector &Deduced);

//===--------------------------------------------------------------------===//
// C++ Template Instantiation
//

MultiLevelTemplateArgumentList
getTemplateInstantiationArgs(NamedDecl *D,
                             const TemplateArgumentList *Innermost = nullptr,
                             bool RelativeToPrimary = false,
                             const FunctionDecl *Pattern = nullptr);

/// A context in which code is being synthesized (where a source location
/// alone is not sufficient to identify the context). This covers template
/// instantiation and various forms of implicitly-generated functions.
struct CodeSynthesisContext {
  /// \brief The kind of template instantiation we are performing
  enum SynthesisKind {
    /// We are instantiating a template declaration. The entity is
    /// the declaration we're instantiating (e.g., a CXXRecordDecl).
    TemplateInstantiation,

    /// We are instantiating a default argument for a template
    /// parameter. The Entity is the template parameter whose argument is
    /// being instantiated, the Template is the template, and the
    /// TemplateArgs/NumTemplateArguments provide the template arguments as
    /// specified.
    DefaultTemplateArgumentInstantiation,

    /// We are instantiating a default argument for a function.
    /// The Entity is the ParmVarDecl, and TemplateArgs/NumTemplateArgs
    /// provides the template arguments as specified.
    DefaultFunctionArgumentInstantiation,

    /// We are substituting explicit template arguments provided for
    /// a function template. The entity is a FunctionTemplateDecl.
    ExplicitTemplateArgumentSubstitution,

    /// We are substituting template argument determined as part of
    /// template argument deduction for either a class template
    /// partial specialization or a function template. The
    /// Entity is either a {Class|Var}TemplatePartialSpecializationDecl or
    /// a TemplateDecl.
    DeducedTemplateArgumentSubstitution,

    /// We are substituting prior template arguments into a new
    /// template parameter. The template parameter itself is either a
    /// NonTypeTemplateParmDecl or a TemplateTemplateParmDecl.
    PriorTemplateArgumentSubstitution,

    /// We are checking the validity of a default template argument that
    /// has been used when naming a template-id.
    DefaultTemplateArgumentChecking,

    /// We are instantiating the exception specification for a function
    /// template which was deferred until it was needed.
    ExceptionSpecInstantiation,

    /// We are declaring an implicit special member function.
    DeclaringSpecialMember,

    /// We are defining a synthesized function (such as a defaulted special
    /// member).
    DefiningSynthesizedFunction,

    /// Added for Template instantiation observation.
    /// Memoization means we are _not_ instantiating a template because
    /// it is already instantiated (but we entered a context where we
    /// would have had to if it was not already instantiated).
    Memoization
  } Kind;

  /// \brief Was the enclosing context a non-instantiation SFINAE context?
  bool SavedInNonInstantiationSFINAEContext;

  /// \brief The point of instantiation or synthesis within the source code.
  SourceLocation PointOfInstantiation;

  /// \brief The entity that is being synthesized.
  Decl *Entity;

  /// \brief The template (or partial specialization) in which we are
  /// performing the instantiation, for substitutions of prior template
  /// arguments.
  NamedDecl *Template;

  /// \brief The list of template arguments we are substituting, if they
  /// are not part of the entity.
  const TemplateArgument *TemplateArgs;

  // FIXME: Wrap this union around more members, or perhaps store the
  // kind-specific members in the RAII object owning the context.
  union {
    /// \brief The number of template arguments in TemplateArgs.
    unsigned NumTemplateArgs;

    /// \brief The special member being declared or defined.
    CXXSpecialMember SpecialMember;
  };

  ArrayRef<TemplateArgument> template_arguments() const {
    assert(Kind != DeclaringSpecialMember)(static_cast <bool> (Kind != DeclaringSpecialMember) ? void
 (0) : __assert_fail ("Kind != DeclaringSpecialMember", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7170, __extension__ __PRETTY_FUNCTION__));
    return {TemplateArgs, NumTemplateArgs};
  }

  /// \brief The template deduction info object associated with the
  /// substitution or checking of explicit or deduced template arguments.
  sema::TemplateDeductionInfo *DeductionInfo;

  /// \brief The source range that covers the construct that cause
  /// the instantiation, e.g., the template-id that causes a class
  /// template instantiation.
  SourceRange InstantiationRange;

  CodeSynthesisContext()
    : Kind(TemplateInstantiation), Entity(nullptr), Template(nullptr),
      TemplateArgs(nullptr), NumTemplateArgs(0), DeductionInfo(nullptr) {}

  /// \brief Determines whether this template is an actual instantiation
  /// that should be counted toward the maximum instantiation depth.
  bool isInstantiationRecord() const;
};

/// \brief List of active code synthesis contexts.
///
/// This vector is treated as a stack. As synthesis of one entity requires
/// synthesis of another, additional contexts are pushed onto the stack.
SmallVector<CodeSynthesisContext, 16> CodeSynthesisContexts;

/// Specializations whose definitions are currently being instantiated.
llvm::DenseSet<std::pair<Decl *, unsigned>> InstantiatingSpecializations;

/// Non-dependent types used in templates that have already been instantiated
/// by some template instantiation.
llvm::DenseSet<QualType> InstantiatedNonDependentTypes;

/// \brief Extra modules inspected when performing a lookup during a template
/// instantiation. Computed lazily.
SmallVector<Module*, 16> CodeSynthesisContextLookupModules;

/// \brief Cache of additional modules that should be used for name lookup
/// within the current template instantiation. Computed lazily; use
/// getLookupModules() to get a complete set.
llvm::DenseSet<Module*> LookupModulesCache;

/// \brief Get the set of additional modules that should be checked during
/// name lookup. A module and its imports become visible when instanting a
/// template defined within it.
llvm::DenseSet<Module*> &getLookupModules();

/// \brief Map from the most recent declaration of a namespace to the most
/// recent visible declaration of that namespace.
llvm::DenseMap<NamedDecl*, NamedDecl*> VisibleNamespaceCache;

/// \brief Whether we are in a SFINAE context that is not associated with
/// template instantiation.
///
/// This is used when setting up a SFINAE trap (\c see SFINAETrap) outside
/// of a template instantiation or template argument deduction.
bool InNonInstantiationSFINAEContext;

/// \brief The number of \p CodeSynthesisContexts that are not template
/// instantiations and, therefore, should not be counted as part of the
/// instantiation depth.
///
/// When the instantiation depth reaches the user-configurable limit
/// \p LangOptions::InstantiationDepth we will abort instantiation.
// FIXME: Should we have a similar limit for other forms of synthesis?
unsigned NonInstantiationEntries;

/// \brief The depth of the context stack at the point when the most recent
/// error or warning was produced.
///
/// This value is used to suppress printing of redundant context stacks
/// when there are multiple errors or warnings in the same instantiation.
// FIXME: Does this belong in Sema? It's tough to implement it anywhere else.
unsigned LastEmittedCodeSynthesisContextDepth = 0;

/// \brief The template instantiation callbacks to trace or track
/// instantiations (objects can be chained).
///
/// This callbacks is used to print, trace or track template
/// instantiations as they are being constructed.
std::vector<std::unique_ptr<TemplateInstantiationCallback>>
    TemplateInstCallbacks;

/// \brief The current index into pack expansion arguments that will be
/// used for substitution of parameter packs.
///
/// The pack expansion index will be -1 to indicate that parameter packs
/// should be instantiated as themselves. Otherwise, the index specifies
/// which argument within the parameter pack will be used for substitution.
int ArgumentPackSubstitutionIndex;

/// \brief RAII object used to change the argument pack substitution index
/// within a \c Sema object.
///
/// See \c ArgumentPackSubstitutionIndex for more information.
class ArgumentPackSubstitutionIndexRAII {
  Sema &Self;
  int OldSubstitutionIndex;

public:
  ArgumentPackSubstitutionIndexRAII(Sema &Self, int NewSubstitutionIndex)
    : Self(Self), OldSubstitutionIndex(Self.ArgumentPackSubstitutionIndex) {
    Self.ArgumentPackSubstitutionIndex = NewSubstitutionIndex;
  }

  ~ArgumentPackSubstitutionIndexRAII() {
    Self.ArgumentPackSubstitutionIndex = OldSubstitutionIndex;
  }
};

friend class ArgumentPackSubstitutionRAII;

/// \brief For each declaration that involved template argument deduction, the
/// set of diagnostics that were suppressed during that template argument
/// deduction.
///
/// FIXME: Serialize this structure to the AST file.
typedef llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >
  SuppressedDiagnosticsMap;
SuppressedDiagnosticsMap SuppressedDiagnostics;

/// \brief A stack object to be created when performing template
/// instantiation.
///
/// Construction of an object of type \c InstantiatingTemplate
/// pushes the current instantiation onto the stack of active
/// instantiations. If the size of this stack exceeds the maximum
/// number of recursive template instantiations, construction
/// produces an error and evaluates true.
///
/// Destruction of this object will pop the named instantiation off
/// the stack.
struct InstantiatingTemplate {
  /// \brief Note that we are instantiating a class template,
  /// function template, variable template, alias template,
  /// or a member thereof.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        Decl *Entity,
                        SourceRange InstantiationRange = SourceRange());

  struct ExceptionSpecification {};
  /// \brief Note that we are instantiating an exception specification
  /// of a function template.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionDecl *Entity, ExceptionSpecification,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating a default argument in a
  /// template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateParameter Param, TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are substituting either explicitly-specified or
  /// deduced template arguments during function template argument deduction.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        FunctionTemplateDecl *FunctionTemplate,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        CodeSynthesisContext::SynthesisKind Kind,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a class template declaration.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a class template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ClassTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating as part of template
  /// argument deduction for a variable template partial
  /// specialization.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        VarTemplatePartialSpecializationDecl *PartialSpec,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        sema::TemplateDeductionInfo &DeductionInfo,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are instantiating a default argument for a function
  /// parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        ParmVarDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange = SourceRange());

  /// \brief Note that we are substituting prior template arguments into a
  /// non-type parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        NonTypeTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// \brief Note that we are substituting prior template arguments into a
  /// template template parameter.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        NamedDecl *Template,
                        TemplateTemplateParmDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);

  /// \brief Note that we are checking the default template argument
  /// against the template parameter for a given template-id.
  InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
                        TemplateDecl *Template,
                        NamedDecl *Param,
                        ArrayRef<TemplateArgument> TemplateArgs,
                        SourceRange InstantiationRange);


  /// \brief Note that we have finished instantiating this template.
  void Clear();

  ~InstantiatingTemplate() { Clear(); }

  /// \brief Determines whether we have exceeded the maximum
  /// recursive template instantiations.
  bool isInvalid() const { return Invalid; }

  /// \brief Determine whether we are already instantiating this
  /// specialization in some surrounding active instantiation.
  bool isAlreadyInstantiating() const { return AlreadyInstantiating; }

private:
  Sema &SemaRef;
  bool Invalid;
  bool AlreadyInstantiating;
  bool CheckInstantiationDepth(SourceLocation PointOfInstantiation,
                               SourceRange InstantiationRange);

  InstantiatingTemplate(
      Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
      SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
      Decl *Entity, NamedDecl *Template = nullptr,
      ArrayRef<TemplateArgument> TemplateArgs = None,
      sema::TemplateDeductionInfo *DeductionInfo = nullptr);

  InstantiatingTemplate(const InstantiatingTemplate&) = delete;

  InstantiatingTemplate&
  operator=(const InstantiatingTemplate&) = delete;
};

void pushCodeSynthesisContext(CodeSynthesisContext Ctx);
void popCodeSynthesisContext();

/// Determine whether we are currently performing template instantiation.
bool inTemplateInstantiation() const {
  return CodeSynthesisContexts.size() > NonInstantiationEntries;
}

void PrintContextStack() {
  if (!CodeSynthesisContexts.empty() &&
      CodeSynthesisContexts.size() != LastEmittedCodeSynthesisContextDepth) {
    PrintInstantiationStack();
    LastEmittedCodeSynthesisContextDepth = CodeSynthesisContexts.size();
  }
  if (PragmaAttributeCurrentTargetDecl)
    PrintPragmaAttributeInstantiationPoint();
}
void PrintInstantiationStack();

void PrintPragmaAttributeInstantiationPoint();

/// \brief Determines whether we are currently in a context where
/// template argument substitution failures are not considered
/// errors.
///
/// \returns An empty \c Optional if we're not in a SFINAE context.
/// Otherwise, contains a pointer that, if non-NULL, contains the nearest
/// template-deduction context object, which can be used to capture
/// diagnostics that will be suppressed.
Optional<sema::TemplateDeductionInfo *> isSFINAEContext() const;

/// \brief Determines whether we are currently in a context that
/// is not evaluated as per C++ [expr] p5.
bool isUnevaluatedContext() const {
  assert(!ExprEvalContexts.empty() &&(static_cast <bool> (!ExprEvalContexts.empty() &&
 "Must be in an expression evaluation context") ? void (0) : __assert_fail
 ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7461, __extension__ __PRETTY_FUNCTION__))
         "Must be in an expression evaluation context")(static_cast <bool> (!ExprEvalContexts.empty() &&
 "Must be in an expression evaluation context") ? void (0) : __assert_fail
 ("!ExprEvalContexts.empty() && \"Must be in an expression evaluation context\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7461, __extension__ __PRETTY_FUNCTION__));
  return ExprEvalContexts.back().isUnevaluated();
}

/// \brief RAII class used to determine whether SFINAE has
/// trapped any errors that occur during template argument
/// deduction.
class SFINAETrap {
  Sema &SemaRef;
  unsigned PrevSFINAEErrors;
  bool PrevInNonInstantiationSFINAEContext;
  bool PrevAccessCheckingSFINAE;
  bool PrevLastDiagnosticIgnored;

public:
  explicit SFINAETrap(Sema &SemaRef, bool AccessCheckingSFINAE = false)
    : SemaRef(SemaRef), PrevSFINAEErrors(SemaRef.NumSFINAEErrors),
      PrevInNonInstantiationSFINAEContext(
                                    SemaRef.InNonInstantiationSFINAEContext),
      PrevAccessCheckingSFINAE(SemaRef.AccessCheckingSFINAE),
      PrevLastDiagnosticIgnored(
          SemaRef.getDiagnostics().isLastDiagnosticIgnored())
  {
    if (!SemaRef.isSFINAEContext())
      SemaRef.InNonInstantiationSFINAEContext = true;
    SemaRef.AccessCheckingSFINAE = AccessCheckingSFINAE;
  }

  ~SFINAETrap() {
    SemaRef.NumSFINAEErrors = PrevSFINAEErrors;
    SemaRef.InNonInstantiationSFINAEContext
      = PrevInNonInstantiationSFINAEContext;
    SemaRef.AccessCheckingSFINAE = PrevAccessCheckingSFINAE;
    SemaRef.getDiagnostics().setLastDiagnosticIgnored(
        PrevLastDiagnosticIgnored);
  }

  /// \brief Determine whether any SFINAE errors have been trapped.
  bool hasErrorOccurred() const {
    return SemaRef.NumSFINAEErrors > PrevSFINAEErrors;
  }
};

/// \brief RAII class used to indicate that we are performing provisional
/// semantic analysis to determine the validity of a construct, so
/// typo-correction and diagnostics in the immediate context (not within
/// implicitly-instantiated templates) should be suppressed.
class TentativeAnalysisScope {
  Sema &SemaRef;
  // FIXME: Using a SFINAETrap for this is a hack.
  SFINAETrap Trap;
  bool PrevDisableTypoCorrection;
public:
  explicit TentativeAnalysisScope(Sema &SemaRef)
      : SemaRef(SemaRef), Trap(SemaRef, true),
        PrevDisableTypoCorrection(SemaRef.DisableTypoCorrection) {
    SemaRef.DisableTypoCorrection = true;
  }
  ~TentativeAnalysisScope() {
    SemaRef.DisableTypoCorrection = PrevDisableTypoCorrection;
  }
};

/// \brief The current instantiation scope used to store local
/// variables.
LocalInstantiationScope *CurrentInstantiationScope;

/// \brief Tracks whether we are in a context where typo correction is
/// disabled.
bool DisableTypoCorrection;

/// \brief The number of typos corrected by CorrectTypo.
unsigned TyposCorrected;

typedef llvm::SmallSet<SourceLocation, 2> SrcLocSet;
typedef llvm::DenseMap<IdentifierInfo *, SrcLocSet> IdentifierSourceLocations;

/// \brief A cache containing identifiers for which typo correction failed and
/// their locations, so that repeated attempts to correct an identifier in a
/// given location are ignored if typo correction already failed for it.
IdentifierSourceLocations TypoCorrectionFailures;

/// \brief Worker object for performing CFG-based warnings.
sema::AnalysisBasedWarnings AnalysisWarnings;
threadSafety::BeforeSet *ThreadSafetyDeclCache;

/// \brief An entity for which implicit template instantiation is required.
///
/// The source location associated with the declaration is the first place in
/// the source code where the declaration was "used". It is not necessarily
/// the point of instantiation (which will be either before or after the
/// namespace-scope declaration that triggered this implicit instantiation),
/// However, it is the location that diagnostics should generally refer to,
/// because users will need to know what code triggered the instantiation.
typedef std::pair<ValueDecl *, SourceLocation> PendingImplicitInstantiation;

/// \brief The queue of implicit template instantiations that are required
/// but have not yet been performed.
std::deque<PendingImplicitInstantiation> PendingInstantiations;

class GlobalEagerInstantiationScope {
public:
  GlobalEagerInstantiationScope(Sema &S, bool Enabled)
      : S(S), Enabled(Enabled) {
    if (!Enabled) return;

    SavedPendingInstantiations.swap(S.PendingInstantiations);
    SavedVTableUses.swap(S.VTableUses);
  }

  void perform() {
    if (Enabled) {
      S.DefineUsedVTables();
      S.PerformPendingInstantiations();
    }
  }

  ~GlobalEagerInstantiationScope() {
    if (!Enabled) return;

    // Restore the set of pending vtables.
    assert(S.VTableUses.empty() &&(static_cast <bool> (S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7583, __extension__ __PRETTY_FUNCTION__))
           "VTableUses should be empty before it is discarded.")(static_cast <bool> (S.VTableUses.empty() && "VTableUses should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.VTableUses.empty() && \"VTableUses should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7583, __extension__ __PRETTY_FUNCTION__));
    S.VTableUses.swap(SavedVTableUses);

    // Restore the set of pending implicit instantiations.
    assert(S.PendingInstantiations.empty() &&(static_cast <bool> (S.PendingInstantiations.empty() &&
 "PendingInstantiations should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7588, __extension__ __PRETTY_FUNCTION__))
           "PendingInstantiations should be empty before it is discarded.")(static_cast <bool> (S.PendingInstantiations.empty() &&
 "PendingInstantiations should be empty before it is discarded."
) ? void (0) : __assert_fail ("S.PendingInstantiations.empty() && \"PendingInstantiations should be empty before it is discarded.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7588, __extension__ __PRETTY_FUNCTION__));
    S.PendingInstantiations.swap(SavedPendingInstantiations);
  }

private:
  Sema &S;
  SmallVector<VTableUse, 16> SavedVTableUses;
  std::deque<PendingImplicitInstantiation> SavedPendingInstantiations;
  bool Enabled;
};

/// \brief The queue of implicit template instantiations that are required
/// and must be performed within the current local scope.
///
/// This queue is only used for member functions of local classes in
/// templates, which must be instantiated in the same scope as their
/// enclosing function, so that they can reference function-local
/// types, static variables, enumerators, etc.
std::deque<PendingImplicitInstantiation> PendingLocalImplicitInstantiations;

class LocalEagerInstantiationScope {
public:
  LocalEagerInstantiationScope(Sema &S) : S(S) {
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

  void perform() { S.PerformPendingInstantiations(/*LocalOnly=*/true); }

  ~LocalEagerInstantiationScope() {
    assert(S.PendingLocalImplicitInstantiations.empty() &&(static_cast <bool> (S.PendingLocalImplicitInstantiations
.empty() && "there shouldn't be any pending local implicit instantiations"
) ? void (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7619, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending local implicit instantiations")(static_cast <bool> (S.PendingLocalImplicitInstantiations
.empty() && "there shouldn't be any pending local implicit instantiations"
) ? void (0) : __assert_fail ("S.PendingLocalImplicitInstantiations.empty() && \"there shouldn't be any pending local implicit instantiations\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7619, __extension__ __PRETTY_FUNCTION__));
    SavedPendingLocalImplicitInstantiations.swap(
        S.PendingLocalImplicitInstantiations);
  }

private:
  Sema &S;
  std::deque<PendingImplicitInstantiation>
      SavedPendingLocalImplicitInstantiations;
};

/// A helper class for building up ExtParameterInfos.
class ExtParameterInfoBuilder {
  SmallVector<FunctionProtoType::ExtParameterInfo, 16> Infos;
  bool HasInteresting = false;

public:
  /// Set the ExtParameterInfo for the parameter at the given index,
  ///
  void set(unsigned index, FunctionProtoType::ExtParameterInfo info) {
    assert(Infos.size() <= index)(static_cast <bool> (Infos.size() <= index) ? void (
0) : __assert_fail ("Infos.size() <= index", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 7639, __extension__ __PRETTY_FUNCTION__));
    Infos.resize(index);
    Infos.push_back(info);

    if (!HasInteresting)
      HasInteresting = (info != FunctionProtoType::ExtParameterInfo());
  }

  /// Return a pointer (suitable for setting in an ExtProtoInfo) to the
  /// ExtParameterInfo array we've built up.
  const FunctionProtoType::ExtParameterInfo *
  getPointerOrNull(unsigned numParams) {
    if (!HasInteresting) return nullptr;
    Infos.resize(numParams);
    return Infos.data();
  }
};

void PerformPendingInstantiations(bool LocalOnly = false);

TypeSourceInfo *SubstType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity,
                          bool AllowDeducedTST = false);

QualType SubstType(QualType T,
                   const MultiLevelTemplateArgumentList &TemplateArgs,
                   SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstType(TypeLoc TL,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                          SourceLocation Loc, DeclarationName Entity);

TypeSourceInfo *SubstFunctionDeclType(TypeSourceInfo *T,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                                      SourceLocation Loc,
                                      DeclarationName Entity,
                                      CXXRecordDecl *ThisContext,
                                      unsigned ThisTypeQuals);
void SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
                        const MultiLevelTemplateArgumentList &Args);
bool SubstExceptionSpec(SourceLocation Loc,
                        FunctionProtoType::ExceptionSpecInfo &ESI,
                        SmallVectorImpl<QualType> &ExceptionStorage,
                        const MultiLevelTemplateArgumentList &Args);
ParmVarDecl *SubstParmVarDecl(ParmVarDecl *D,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                              int indexAdjustment,
                              Optional<unsigned> NumExpansions,
                              bool ExpectParameterPack);
bool SubstParmTypes(SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
                    const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
                    const MultiLevelTemplateArgumentList &TemplateArgs,
                    SmallVectorImpl<QualType> &ParamTypes,
                    SmallVectorImpl<ParmVarDecl *> *OutParams,
                    ExtParameterInfoBuilder &ParamInfos);
ExprResult SubstExpr(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

/// \brief Substitute the given template arguments into a list of
/// expressions, expanding pack expansions if required.
///
/// \param Exprs The list of expressions to substitute into.
///
/// \param IsCall Whether this is some form of call, in which case
/// default arguments will be dropped.
///
/// \param TemplateArgs The set of template arguments to substitute.
///
/// \param Outputs Will receive all of the substituted arguments.
///
/// \returns true if an error occurred, false otherwise.
bool SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall,
                const MultiLevelTemplateArgumentList &TemplateArgs,
                SmallVectorImpl<Expr *> &Outputs);

StmtResult SubstStmt(Stmt *S,
                     const MultiLevelTemplateArgumentList &TemplateArgs);

Decl *SubstDecl(Decl *D, DeclContext *Owner,
                const MultiLevelTemplateArgumentList &TemplateArgs);

ExprResult SubstInitializer(Expr *E,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     bool CXXDirectInit);

bool
SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
                    CXXRecordDecl *Pattern,
                    const MultiLevelTemplateArgumentList &TemplateArgs);

bool
InstantiateClass(SourceLocation PointOfInstantiation,
                 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
                 const MultiLevelTemplateArgumentList &TemplateArgs,
                 TemplateSpecializationKind TSK,
                 bool Complain = true);

bool InstantiateEnum(SourceLocation PointOfInstantiation,
                     EnumDecl *Instantiation, EnumDecl *Pattern,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     TemplateSpecializationKind TSK);

bool InstantiateInClassInitializer(
    SourceLocation PointOfInstantiation, FieldDecl *Instantiation,
    FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs);

struct LateInstantiatedAttribute {
  const Attr *TmplAttr;
  LocalInstantiationScope *Scope;
  Decl *NewDecl;

  LateInstantiatedAttribute(const Attr *A, LocalInstantiationScope *S,
                            Decl *D)
    : TmplAttr(A), Scope(S), NewDecl(D)
  { }
};
typedef SmallVector<LateInstantiatedAttribute, 16> LateInstantiatedAttrVec;

void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
                      const Decl *Pattern, Decl *Inst,
                      LateInstantiatedAttrVec *LateAttrs = nullptr,
                      LocalInstantiationScope *OuterMostScope = nullptr);

void
InstantiateAttrsForDecl(const MultiLevelTemplateArgumentList &TemplateArgs,
                        const Decl *Pattern, Decl *Inst,
                        LateInstantiatedAttrVec *LateAttrs = nullptr,
                        LocalInstantiationScope *OuterMostScope = nullptr);

bool usesPartialOrExplicitSpecialization(
    SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec);

bool
InstantiateClassTemplateSpecialization(SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                         TemplateSpecializationKind TSK,
                         bool Complain = true);

void InstantiateClassMembers(SourceLocation PointOfInstantiation,
                             CXXRecordDecl *Instantiation,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                             TemplateSpecializationKind TSK);

void InstantiateClassTemplateSpecializationMembers(
                                        SourceLocation PointOfInstantiation,
                         ClassTemplateSpecializationDecl *ClassTemplateSpec,
                                              TemplateSpecializationKind TSK);

NestedNameSpecifierLoc
SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
                         const MultiLevelTemplateArgumentList &TemplateArgs);

DeclarationNameInfo
SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
                         const MultiLevelTemplateArgumentList &TemplateArgs);
TemplateName
SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, TemplateName Name,
                  SourceLocation Loc,
                  const MultiLevelTemplateArgumentList &TemplateArgs);
bool Subst(const TemplateArgumentLoc *Args, unsigned NumArgs,
           TemplateArgumentListInfo &Result,
           const MultiLevelTemplateArgumentList &TemplateArgs);

void InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
                              FunctionDecl *Function);
FunctionDecl *InstantiateFunctionDeclaration(FunctionTemplateDecl *FTD,
                                             const TemplateArgumentList *Args,
                                             SourceLocation Loc);
void InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
                                   FunctionDecl *Function,
                                   bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);
VarTemplateSpecializationDecl *BuildVarTemplateInstantiation(
    VarTemplateDecl *VarTemplate, VarDecl *FromVar,
    const TemplateArgumentList &TemplateArgList,
    const TemplateArgumentListInfo &TemplateArgsInfo,
    SmallVectorImpl<TemplateArgument> &Converted,
    SourceLocation PointOfInstantiation, void *InsertPos,
    LateInstantiatedAttrVec *LateAttrs = nullptr,
    LocalInstantiationScope *StartingScope = nullptr);
VarTemplateSpecializationDecl *CompleteVarTemplateSpecializationDecl(
    VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void
BuildVariableInstantiation(VarDecl *NewVar, VarDecl *OldVar,
                           const MultiLevelTemplateArgumentList &TemplateArgs,
                           LateInstantiatedAttrVec *LateAttrs,
                           DeclContext *Owner,
                           LocalInstantiationScope *StartingScope,
                           bool InstantiatingVarTemplate = false);
void InstantiateVariableInitializer(
    VarDecl *Var, VarDecl *OldVar,
    const MultiLevelTemplateArgumentList &TemplateArgs);
void InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
                                   VarDecl *Var, bool Recursive = false,
                                   bool DefinitionRequired = false,
                                   bool AtEndOfTU = false);

void InstantiateMemInitializers(CXXConstructorDecl *New,
                                const CXXConstructorDecl *Tmpl,
                          const MultiLevelTemplateArgumentList &TemplateArgs);

NamedDecl *FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
                        const MultiLevelTemplateArgumentList &TemplateArgs,
                        bool FindingInstantiatedContext = false);
DeclContext *FindInstantiatedContext(SourceLocation Loc, DeclContext *DC,
                        const MultiLevelTemplateArgumentList &TemplateArgs);

// Objective-C declarations.
enum ObjCContainerKind {
  OCK_None = -1,
  OCK_Interface = 0,
  OCK_Protocol,
  OCK_Category,
  OCK_ClassExtension,
  OCK_Implementation,
  OCK_CategoryImplementation
};
ObjCContainerKind getObjCContainerKind() const;

DeclResult actOnObjCTypeParam(Scope *S,
                              ObjCTypeParamVariance variance,
                              SourceLocation varianceLoc,
                              unsigned index,
                              IdentifierInfo *paramName,
                              SourceLocation paramLoc,
                              SourceLocation colonLoc,
                              ParsedType typeBound);

ObjCTypeParamList *actOnObjCTypeParamList(Scope *S, SourceLocation lAngleLoc,
                                          ArrayRef<Decl *> typeParams,
                                          SourceLocation rAngleLoc);
void popObjCTypeParamList(Scope *S, ObjCTypeParamList *typeParamList);

Decl *ActOnStartClassInterface(Scope *S,
                               SourceLocation AtInterfaceLoc,
                               IdentifierInfo *ClassName,
                               SourceLocation ClassLoc,
                               ObjCTypeParamList *typeParamList,
                               IdentifierInfo *SuperName,
                               SourceLocation SuperLoc,
                               ArrayRef<ParsedType> SuperTypeArgs,
                               SourceRange SuperTypeArgsRange,
                               Decl * const *ProtoRefs,
                               unsigned NumProtoRefs,
                               const SourceLocation *ProtoLocs,
                               SourceLocation EndProtoLoc,
                               AttributeList *AttrList);

void ActOnSuperClassOfClassInterface(Scope *S,
                                     SourceLocation AtInterfaceLoc,
                                     ObjCInterfaceDecl *IDecl,
                                     IdentifierInfo *ClassName,
                                     SourceLocation ClassLoc,
                                     IdentifierInfo *SuperName,
                                     SourceLocation SuperLoc,
                                     ArrayRef<ParsedType> SuperTypeArgs,
                                     SourceRange SuperTypeArgsRange);

void ActOnTypedefedProtocols(SmallVectorImpl<Decl *> &ProtocolRefs,
                             SmallVectorImpl<SourceLocation> &ProtocolLocs,
                             IdentifierInfo *SuperName,
                             SourceLocation SuperLoc);

Decl *ActOnCompatibilityAlias(
                  SourceLocation AtCompatibilityAliasLoc,
                  IdentifierInfo *AliasName,  SourceLocation AliasLocation,
                  IdentifierInfo *ClassName, SourceLocation ClassLocation);

bool CheckForwardProtocolDeclarationForCircularDependency(
  IdentifierInfo *PName,
  SourceLocation &PLoc, SourceLocation PrevLoc,
  const ObjCList<ObjCProtocolDecl> &PList);

Decl *ActOnStartProtocolInterface(
                  SourceLocation AtProtoInterfaceLoc,
                  IdentifierInfo *ProtocolName, SourceLocation ProtocolLoc,
                  Decl * const *ProtoRefNames, unsigned NumProtoRefs,
                  const SourceLocation *ProtoLocs,
                  SourceLocation EndProtoLoc,
                  AttributeList *AttrList);

Decl *ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
                                  IdentifierInfo *ClassName,
                                  SourceLocation ClassLoc,
                                  ObjCTypeParamList *typeParamList,
                                  IdentifierInfo *CategoryName,
                                  SourceLocation CategoryLoc,
                                  Decl * const *ProtoRefs,
                                  unsigned NumProtoRefs,
                                  const SourceLocation *ProtoLocs,
                                  SourceLocation EndProtoLoc,
                                  AttributeList *AttrList);

Decl *ActOnStartClassImplementation(
                  SourceLocation AtClassImplLoc,
                  IdentifierInfo *ClassName, SourceLocation ClassLoc,
                  IdentifierInfo *SuperClassname,
                  SourceLocation SuperClassLoc);

Decl *ActOnStartCategoryImplementation(SourceLocation AtCatImplLoc,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassLoc,
                                       IdentifierInfo *CatName,
                                       SourceLocation CatLoc);

DeclGroupPtrTy ActOnFinishObjCImplementation(Decl *ObjCImpDecl,
                                             ArrayRef<Decl *> Decls);

DeclGroupPtrTy ActOnForwardClassDeclaration(SourceLocation Loc,
                 IdentifierInfo **IdentList,
                 SourceLocation *IdentLocs,
                 ArrayRef<ObjCTypeParamList *> TypeParamLists,
                 unsigned NumElts);

DeclGroupPtrTy ActOnForwardProtocolDeclaration(SourceLocation AtProtoclLoc,
                                      ArrayRef<IdentifierLocPair> IdentList,
                                      AttributeList *attrList);

void FindProtocolDeclaration(bool WarnOnDeclarations, bool ForObjCContainer,
                             ArrayRef<IdentifierLocPair> ProtocolId,
                             SmallVectorImpl<Decl *> &Protocols);

void DiagnoseTypeArgsAndProtocols(IdentifierInfo *ProtocolId,
                                  SourceLocation ProtocolLoc,
                                  IdentifierInfo *TypeArgId,
                                  SourceLocation TypeArgLoc,
                                  bool SelectProtocolFirst = false);

/// Given a list of identifiers (and their locations), resolve the
/// names to either Objective-C protocol qualifiers or type
/// arguments, as appropriate.
void actOnObjCTypeArgsOrProtocolQualifiers(
       Scope *S,
       ParsedType baseType,
       SourceLocation lAngleLoc,
       ArrayRef<IdentifierInfo *> identifiers,
       ArrayRef<SourceLocation> identifierLocs,
       SourceLocation rAngleLoc,
       SourceLocation &typeArgsLAngleLoc,
       SmallVectorImpl<ParsedType> &typeArgs,
       SourceLocation &typeArgsRAngleLoc,
       SourceLocation &protocolLAngleLoc,
       SmallVectorImpl<Decl *> &protocols,
       SourceLocation &protocolRAngleLoc,
       bool warnOnIncompleteProtocols);

/// Build a an Objective-C protocol-qualified 'id' type where no
/// base type was specified.
TypeResult actOnObjCProtocolQualifierType(
             SourceLocation lAngleLoc,
             ArrayRef<Decl *> protocols,
             ArrayRef<SourceLocation> protocolLocs,
             SourceLocation rAngleLoc);

/// Build a specialized and/or protocol-qualified Objective-C type.
TypeResult actOnObjCTypeArgsAndProtocolQualifiers(
             Scope *S,
             SourceLocation Loc,
             ParsedType BaseType,
             SourceLocation TypeArgsLAngleLoc,
             ArrayRef<ParsedType> TypeArgs,
             SourceLocation TypeArgsRAngleLoc,
             SourceLocation ProtocolLAngleLoc,
             ArrayRef<Decl *> Protocols,
             ArrayRef<SourceLocation> ProtocolLocs,
             SourceLocation ProtocolRAngleLoc);

/// Build an Objective-C type parameter type.
QualType BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
                                SourceLocation ProtocolLAngleLoc,
                                ArrayRef<ObjCProtocolDecl *> Protocols,
                                ArrayRef<SourceLocation> ProtocolLocs,
                                SourceLocation ProtocolRAngleLoc,
                                bool FailOnError = false);

/// Build an Objective-C object pointer type.
QualType BuildObjCObjectType(QualType BaseType,
                             SourceLocation Loc,
                             SourceLocation TypeArgsLAngleLoc,
                             ArrayRef<TypeSourceInfo *> TypeArgs,
                             SourceLocation TypeArgsRAngleLoc,
                             SourceLocation ProtocolLAngleLoc,
                             ArrayRef<ObjCProtocolDecl *> Protocols,
                             ArrayRef<SourceLocation> ProtocolLocs,
                             SourceLocation ProtocolRAngleLoc,
                             bool FailOnError = false);

/// Check the application of the Objective-C '__kindof' qualifier to
/// the given type.
bool checkObjCKindOfType(QualType &type, SourceLocation loc);

/// Ensure attributes are consistent with type.
/// \param [in, out] Attributes The attributes to check; they will
/// be modified to be consistent with \p PropertyTy.
void CheckObjCPropertyAttributes(Decl *PropertyPtrTy,
                                 SourceLocation Loc,
                                 unsigned &Attributes,
                                 bool propertyInPrimaryClass);

/// Process the specified property declaration and create decls for the
/// setters and getters as needed.
/// \param property The property declaration being processed
void ProcessPropertyDecl(ObjCPropertyDecl *property);


void DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
                              ObjCPropertyDecl *SuperProperty,
                              const IdentifierInfo *Name,
                              bool OverridingProtocolProperty);

void DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
                                      ObjCInterfaceDecl *ID);

Decl *ActOnAtEnd(Scope *S, SourceRange AtEnd,
                 ArrayRef<Decl *> allMethods = None,
                 ArrayRef<DeclGroupPtrTy> allTUVars = None);

Decl *ActOnProperty(Scope *S, SourceLocation AtLoc,
                    SourceLocation LParenLoc,
                    FieldDeclarator &FD, ObjCDeclSpec &ODS,
                    Selector GetterSel, Selector SetterSel,
                    tok::ObjCKeywordKind MethodImplKind,
                    DeclContext *lexicalDC = nullptr);

Decl *ActOnPropertyImplDecl(Scope *S,
                            SourceLocation AtLoc,
                            SourceLocation PropertyLoc,
                            bool ImplKind,
                            IdentifierInfo *PropertyId,
                            IdentifierInfo *PropertyIvar,
                            SourceLocation PropertyIvarLoc,
                            ObjCPropertyQueryKind QueryKind);

enum ObjCSpecialMethodKind {
  OSMK_None,
  OSMK_Alloc,
  OSMK_New,
  OSMK_Copy,
  OSMK_RetainingInit,
  OSMK_NonRetainingInit
};

struct ObjCArgInfo {
  IdentifierInfo *Name;
  SourceLocation NameLoc;
  // The Type is null if no type was specified, and the DeclSpec is invalid
  // in this case.
  ParsedType Type;
  ObjCDeclSpec DeclSpec;

  /// ArgAttrs - Attribute list for this argument.
  AttributeList *ArgAttrs;
};

Decl *ActOnMethodDeclaration(
  Scope *S,
  SourceLocation BeginLoc, // location of the + or -.
  SourceLocation EndLoc,   // location of the ; or {.
  tok::TokenKind MethodType,
  ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
  ArrayRef<SourceLocation> SelectorLocs, Selector Sel,
  // optional arguments. The number of types/arguments is obtained
  // from the Sel.getNumArgs().
  ObjCArgInfo *ArgInfo,
  DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
  AttributeList *AttrList, tok::ObjCKeywordKind MethodImplKind,
  bool isVariadic, bool MethodDefinition);

ObjCMethodDecl *LookupMethodInQualifiedType(Selector Sel,
                                            const ObjCObjectPointerType *OPT,
                                            bool IsInstance);
ObjCMethodDecl *LookupMethodInObjectType(Selector Sel, QualType Ty,
                                         bool IsInstance);

bool CheckARCMethodDecl(ObjCMethodDecl *method);
bool inferObjCARCLifetime(ValueDecl *decl);

ExprResult
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
                          Expr *BaseExpr,
                          SourceLocation OpLoc,
                          DeclarationName MemberName,
                          SourceLocation MemberLoc,
                          SourceLocation SuperLoc, QualType SuperType,
                          bool Super);

ExprResult
ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
                          IdentifierInfo &propertyName,
                          SourceLocation receiverNameLoc,
                          SourceLocation propertyNameLoc);

ObjCMethodDecl *tryCaptureObjCSelf(SourceLocation Loc);

/// \brief Describes the kind of message expression indicated by a message
/// send that starts with an identifier.
enum ObjCMessageKind {
  /// \brief The message is sent to 'super'.
  ObjCSuperMessage,
  /// \brief The message is an instance message.
  ObjCInstanceMessage,
  /// \brief The message is a class message, and the identifier is a type
  /// name.
  ObjCClassMessage
};

ObjCMessageKind getObjCMessageKind(Scope *S,
                                   IdentifierInfo *Name,
                                   SourceLocation NameLoc,
                                   bool IsSuper,
                                   bool HasTrailingDot,
                                   ParsedType &ReceiverType);

ExprResult ActOnSuperMessage(Scope *S, SourceLocation SuperLoc,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
                             QualType ReceiverType,
                             SourceLocation SuperLoc,
                             Selector Sel,
                             ObjCMethodDecl *Method,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args,
                             bool isImplicit = false);

ExprResult BuildClassMessageImplicit(QualType ReceiverType,
                                     bool isSuperReceiver,
                                     SourceLocation Loc,
                                     Selector Sel,
                                     ObjCMethodDecl *Method,
                                     MultiExprArg Args);

ExprResult ActOnClassMessage(Scope *S,
                             ParsedType Receiver,
                             Selector Sel,
                             SourceLocation LBracLoc,
                             ArrayRef<SourceLocation> SelectorLocs,
                             SourceLocation RBracLoc,
                             MultiExprArg Args);

ExprResult BuildInstanceMessage(Expr *Receiver,
                                QualType ReceiverType,
                                SourceLocation SuperLoc,
                                Selector Sel,
                                ObjCMethodDecl *Method,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args,
                                bool isImplicit = false);

ExprResult BuildInstanceMessageImplicit(Expr *Receiver,
                                        QualType ReceiverType,
                                        SourceLocation Loc,
                                        Selector Sel,
                                        ObjCMethodDecl *Method,
                                        MultiExprArg Args);

ExprResult ActOnInstanceMessage(Scope *S,
                                Expr *Receiver,
                                Selector Sel,
                                SourceLocation LBracLoc,
                                ArrayRef<SourceLocation> SelectorLocs,
                                SourceLocation RBracLoc,
                                MultiExprArg Args);

ExprResult BuildObjCBridgedCast(SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                TypeSourceInfo *TSInfo,
                                Expr *SubExpr);

ExprResult ActOnObjCBridgedCast(Scope *S,
                                SourceLocation LParenLoc,
                                ObjCBridgeCastKind Kind,
                                SourceLocation BridgeKeywordLoc,
                                ParsedType Type,
                                SourceLocation RParenLoc,
                                Expr *SubExpr);

void CheckTollFreeBridgeCast(QualType castType, Expr *castExpr);

void CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr);

bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
                                   CastKind &Kind);

bool checkObjCBridgeRelatedComponents(SourceLocation Loc,
                                      QualType DestType, QualType SrcType,
                                      ObjCInterfaceDecl *&RelatedClass,
                                      ObjCMethodDecl *&ClassMethod,
                                      ObjCMethodDecl *&InstanceMethod,
                                      TypedefNameDecl *&TDNDecl,
                                      bool CfToNs, bool Diagnose = true);

bool CheckObjCBridgeRelatedConversions(SourceLocation Loc,
                                       QualType DestType, QualType SrcType,
                                       Expr *&SrcExpr, bool Diagnose = true);

bool ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&SrcExpr,
                                        bool Diagnose = true);

bool checkInitMethod(ObjCMethodDecl *method, QualType receiverTypeIfCall);

/// \brief Check whether the given new method is a valid override of the
/// given overridden method, and set any properties that should be inherited.
void CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
                             const ObjCMethodDecl *Overridden);

/// \brief Describes the compatibility of a result type with its method.
enum ResultTypeCompatibilityKind {
  RTC_Compatible,
  RTC_Incompatible,
  RTC_Unknown
};

void CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod,
                              ObjCInterfaceDecl *CurrentClass,
                              ResultTypeCompatibilityKind RTC);

enum PragmaOptionsAlignKind {
  POAK_Native,  // #pragma options align=native
  POAK_Natural, // #pragma options align=natural
  POAK_Packed,  // #pragma options align=packed
  POAK_Power,   // #pragma options align=power
  POAK_Mac68k,  // #pragma options align=mac68k
  POAK_Reset    // #pragma options align=reset
};

/// ActOnPragmaClangSection - Called on well formed \#pragma clang section
void ActOnPragmaClangSection(SourceLocation PragmaLoc,
                             PragmaClangSectionAction Action,
                             PragmaClangSectionKind SecKind, StringRef SecName);

/// ActOnPragmaOptionsAlign - Called on well formed \#pragma options align.
void ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
                             SourceLocation PragmaLoc);

/// ActOnPragmaPack - Called on well formed \#pragma pack(...).
void ActOnPragmaPack(SourceLocation PragmaLoc, PragmaMsStackAction Action,
                     StringRef SlotLabel, Expr *Alignment);

enum class PragmaPackDiagnoseKind {
  NonDefaultStateAtInclude,
  ChangedStateAtExit
};

void DiagnoseNonDefaultPragmaPack(PragmaPackDiagnoseKind Kind,
                                  SourceLocation IncludeLoc);
void DiagnoseUnterminatedPragmaPack();

/// ActOnPragmaMSStruct - Called on well formed \#pragma ms_struct [on|off].
void ActOnPragmaMSStruct(PragmaMSStructKind Kind);

/// ActOnPragmaMSComment - Called on well formed
/// \#pragma comment(kind, "arg").
void ActOnPragmaMSComment(SourceLocation CommentLoc, PragmaMSCommentKind Kind,
                          StringRef Arg);

/// ActOnPragmaMSPointersToMembers - called on well formed \#pragma
/// pointers_to_members(representation method[, general purpose
/// representation]).
void ActOnPragmaMSPointersToMembers(
    LangOptions::PragmaMSPointersToMembersKind Kind,
    SourceLocation PragmaLoc);

/// \brief Called on well formed \#pragma vtordisp().
void ActOnPragmaMSVtorDisp(PragmaMsStackAction Action,
                           SourceLocation PragmaLoc,
                           MSVtorDispAttr::Mode Value);

enum PragmaSectionKind {
  PSK_DataSeg,
  PSK_BSSSeg,
  PSK_ConstSeg,
  PSK_CodeSeg,
};

bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  DeclaratorDecl *TheDecl);
bool UnifySection(StringRef SectionName,
                  int SectionFlags,
                  SourceLocation PragmaSectionLocation);

/// \brief Called on well formed \#pragma bss_seg/data_seg/const_seg/code_seg.
void ActOnPragmaMSSeg(SourceLocation PragmaLocation,
                      PragmaMsStackAction Action,
                      llvm::StringRef StackSlotLabel,
                      StringLiteral *SegmentName,
                      llvm::StringRef PragmaName);

/// \brief Called on well formed \#pragma section().
void ActOnPragmaMSSection(SourceLocation PragmaLocation,
                          int SectionFlags, StringLiteral *SegmentName);

/// \brief Called on well-formed \#pragma init_seg().
void ActOnPragmaMSInitSeg(SourceLocation PragmaLocation,
                          StringLiteral *SegmentName);

/// \brief Called on #pragma clang __debug dump II
void ActOnPragmaDump(Scope *S, SourceLocation Loc, IdentifierInfo *II);

/// ActOnPragmaDetectMismatch - Call on well-formed \#pragma detect_mismatch
void ActOnPragmaDetectMismatch(SourceLocation Loc, StringRef Name,
                               StringRef Value);

/// ActOnPragmaUnused - Called on well-formed '\#pragma unused'.
void ActOnPragmaUnused(const Token &Identifier,
                       Scope *curScope,
                       SourceLocation PragmaLoc);

/// ActOnPragmaVisibility - Called on well formed \#pragma GCC visibility... .
void ActOnPragmaVisibility(const IdentifierInfo* VisType,
                           SourceLocation PragmaLoc);

NamedDecl *DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
                               SourceLocation Loc);
void DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W);

/// ActOnPragmaWeakID - Called on well formed \#pragma weak ident.
void ActOnPragmaWeakID(IdentifierInfo* WeakName,
                       SourceLocation PragmaLoc,
                       SourceLocation WeakNameLoc);

/// ActOnPragmaRedefineExtname - Called on well formed
/// \#pragma redefine_extname oldname newname.
void ActOnPragmaRedefineExtname(IdentifierInfo* WeakName,
                                IdentifierInfo* AliasName,
                                SourceLocation PragmaLoc,
                                SourceLocation WeakNameLoc,
                                SourceLocation AliasNameLoc);

/// ActOnPragmaWeakAlias - Called on well formed \#pragma weak ident = ident.
void ActOnPragmaWeakAlias(IdentifierInfo* WeakName,
                          IdentifierInfo* AliasName,
                          SourceLocation PragmaLoc,
                          SourceLocation WeakNameLoc,
                          SourceLocation AliasNameLoc);

/// ActOnPragmaFPContract - Called on well formed
/// \#pragma {STDC,OPENCL} FP_CONTRACT and
/// \#pragma clang fp contract
void ActOnPragmaFPContract(LangOptions::FPContractModeKind FPC);

/// AddAlignmentAttributesForRecord - Adds any needed alignment attributes to
/// a the record decl, to handle '\#pragma pack' and '\#pragma options align'.
void AddAlignmentAttributesForRecord(RecordDecl *RD);

/// AddMsStructLayoutForRecord - Adds ms_struct layout attribute to record.
void AddMsStructLayoutForRecord(RecordDecl *RD);

/// FreePackedContext - Deallocate and null out PackContext.
void FreePackedContext();

/// PushNamespaceVisibilityAttr - Note that we've entered a
/// namespace with a visibility attribute.
void PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
                                 SourceLocation Loc);

/// AddPushedVisibilityAttribute - If '\#pragma GCC visibility' was used,
/// add an appropriate visibility attribute.
void AddPushedVisibilityAttribute(Decl *RD);

/// PopPragmaVisibility - Pop the top element of the visibility stack; used
/// for '\#pragma GCC visibility' and visibility attributes on namespaces.
void PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc);

/// FreeVisContext - Deallocate and null out VisContext.
void FreeVisContext();

/// AddCFAuditedAttribute - Check whether we're currently within
/// '\#pragma clang arc_cf_code_audited' and, if so, consider adding
/// the appropriate attribute.
void AddCFAuditedAttribute(Decl *D);

/// \brief Called on well-formed '\#pragma clang attribute push'.
void ActOnPragmaAttributePush(AttributeList &Attribute,
                              SourceLocation PragmaLoc,
                              attr::ParsedSubjectMatchRuleSet Rules);

/// \brief Called on well-formed '\#pragma clang attribute pop'.
void ActOnPragmaAttributePop(SourceLocation PragmaLoc);

/// \brief Adds the attributes that have been specified using the
/// '\#pragma clang attribute push' directives to the given declaration.
void AddPragmaAttributes(Scope *S, Decl *D);

void DiagnoseUnterminatedPragmaAttribute();

/// \brief Called on well formed \#pragma clang optimize.
void ActOnPragmaOptimize(bool On, SourceLocation PragmaLoc);

/// \brief Get the location for the currently active "\#pragma clang optimize
/// off". If this location is invalid, then the state of the pragma is "on".
SourceLocation getOptimizeOffPragmaLocation() const {
  return OptimizeOffPragmaLocation;
}

/// \brief Only called on function definitions; if there is a pragma in scope
/// with the effect of a range-based optnone, consider marking the function
/// with attribute optnone.
void AddRangeBasedOptnone(FunctionDecl *FD);

/// \brief Adds the 'optnone' attribute to the function declaration if there
/// are no conflicts; Loc represents the location causing the 'optnone'
/// attribute to be added (usually because of a pragma).
void AddOptnoneAttributeIfNoConflicts(FunctionDecl *FD, SourceLocation Loc);

/// AddAlignedAttr - Adds an aligned attribute to a particular declaration.
void AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
                    unsigned SpellingListIndex, bool IsPackExpansion);
void AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *T,
                    unsigned SpellingListIndex, bool IsPackExpansion);

/// AddAssumeAlignedAttr - Adds an assume_aligned attribute to a particular
/// declaration.
void AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E, Expr *OE,
                          unsigned SpellingListIndex);

/// AddAllocAlignAttr - Adds an alloc_align attribute to a particular
/// declaration.
void AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
                       unsigned SpellingListIndex);

/// AddAlignValueAttr - Adds an align_value attribute to a particular
/// declaration.
void AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
                       unsigned SpellingListIndex);

/// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
/// declaration.
void AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
                         Expr *MinBlocks, unsigned SpellingListIndex);

/// AddModeAttr - Adds a mode attribute to a particular declaration.
void AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
                 unsigned SpellingListIndex, bool InInstantiation = false);

void AddParameterABIAttr(SourceRange AttrRange, Decl *D,
                         ParameterABI ABI, unsigned SpellingListIndex);

void AddNSConsumedAttr(SourceRange AttrRange, Decl *D,
                       unsigned SpellingListIndex, bool isNSConsumed,
                       bool isTemplateInstantiation);

bool checkNSReturnsRetainedReturnType(SourceLocation loc, QualType type);

//===--------------------------------------------------------------------===//
// C++ Coroutines TS
//
bool ActOnCoroutineBodyStart(Scope *S, SourceLocation KwLoc,
                             StringRef Keyword);
ExprResult ActOnCoawaitExpr(Scope *S, SourceLocation KwLoc, Expr *E);
ExprResult ActOnCoyieldExpr(Scope *S, SourceLocation KwLoc, Expr *E);
StmtResult ActOnCoreturnStmt(Scope *S, SourceLocation KwLoc, Expr *E);

ExprResult BuildResolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                    bool IsImplicit = false);
ExprResult BuildUnresolvedCoawaitExpr(SourceLocation KwLoc, Expr *E,
                                      UnresolvedLookupExpr* Lookup);
ExprResult BuildCoyieldExpr(SourceLocation KwLoc, Expr *E);
StmtResult BuildCoreturnStmt(SourceLocation KwLoc, Expr *E,
                             bool IsImplicit = false);
StmtResult BuildCoroutineBodyStmt(CoroutineBodyStmt::CtorArgs);
bool buildCoroutineParameterMoves(SourceLocation Loc);
VarDecl *buildCoroutinePromise(SourceLocation Loc);
void CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body);

//===--------------------------------------------------------------------===//
// OpenCL extensions.
//
8520private:
std::string CurrOpenCLExtension;
/// Extensions required by an OpenCL type.
llvm::DenseMap<const Type*, std::set<std::string>> OpenCLTypeExtMap;
/// Extensions required by an OpenCL declaration.
llvm::DenseMap<const Decl*, std::set<std::string>> OpenCLDeclExtMap;
8526public:
llvm::StringRef getCurrentOpenCLExtension() const {
  return CurrOpenCLExtension;
}
void setCurrentOpenCLExtension(llvm::StringRef Ext) {
  CurrOpenCLExtension = Ext;
}

/// \brief Set OpenCL extensions for a type which can only be used when these
/// OpenCL extensions are enabled. If \p Exts is empty, do nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForType(QualType T, llvm::StringRef Exts);

/// \brief Set OpenCL extensions for a declaration which can only be
/// used when these OpenCL extensions are enabled. If \p Exts is empty, do
/// nothing.
/// \param Exts A space separated list of OpenCL extensions.
void setOpenCLExtensionForDecl(Decl *FD, llvm::StringRef Exts);

/// \brief Set current OpenCL extensions for a type which can only be used
/// when these OpenCL extensions are enabled. If current OpenCL extension is
/// empty, do nothing.
void setCurrentOpenCLExtensionForType(QualType T);

/// \brief Set current OpenCL extensions for a declaration which
/// can only be used when these OpenCL extensions are enabled. If current
/// OpenCL extension is empty, do nothing.
void setCurrentOpenCLExtensionForDecl(Decl *FD);

bool isOpenCLDisabledDecl(Decl *FD);

/// \brief Check if type \p T corresponding to declaration specifier \p DS
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType T);

/// \brief Check if declaration \p D used by expression \p E
/// is disabled due to required OpenCL extensions being disabled. If so,
/// emit diagnostics.
/// \return true if type is disabled.
bool checkOpenCLDisabledDecl(const NamedDecl &D, const Expr &E);

//===--------------------------------------------------------------------===//
// OpenMP directives and clauses.
//
8572private:
void *VarDataSharingAttributesStack;
/// Set to true inside '#pragma omp declare target' region.
bool IsInOpenMPDeclareTargetContext = false;
/// \brief Initialization of data-sharing attributes stack.
void InitDataSharingAttributesStack();
void DestroyDataSharingAttributesStack();
ExprResult
VerifyPositiveIntegerConstantInClause(Expr *Op, OpenMPClauseKind CKind,
                                      bool StrictlyPositive = true);
/// Returns OpenMP nesting level for current directive.
unsigned getOpenMPNestingLevel() const;

/// Adjusts the function scopes index for the target-based regions.
void adjustOpenMPTargetScopeIndex(unsigned &FunctionScopesIndex,
                                  unsigned Level) const;

/// Push new OpenMP function region for non-capturing function.
void pushOpenMPFunctionRegion();

/// Pop OpenMP function region for non-capturing function.
void popOpenMPFunctionRegion(const sema::FunctionScopeInfo *OldFSI);

/// Checks if a type or a declaration is disabled due to the owning extension
/// being disabled, and emits diagnostic messages if it is disabled.
/// \param D type or declaration to be checked.
/// \param DiagLoc source location for the diagnostic message.
/// \param DiagInfo information to be emitted for the diagnostic message.
/// \param SrcRange source range of the declaration.
/// \param Map maps type or declaration to the extensions.
/// \param Selector selects diagnostic message: 0 for type and 1 for
///        declaration.
/// \return true if the type or declaration is disabled.
template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
bool checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc, DiagInfoT DiagInfo,
                                   MapT &Map, unsigned Selector = 0,
                                   SourceRange SrcRange = SourceRange());

8610public:
/// \brief Return true if the provided declaration \a VD should be captured by
/// reference.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool IsOpenMPCapturedByRef(ValueDecl *D, unsigned Level);

/// \brief Check if the specified variable is used in one of the private
/// clauses (private, firstprivate, lastprivate, reduction etc.) in OpenMP
/// constructs.
VarDecl *IsOpenMPCapturedDecl(ValueDecl *D);
ExprResult getOpenMPCapturedExpr(VarDecl *Capture, ExprValueKind VK,
                                 ExprObjectKind OK, SourceLocation Loc);

/// \brief Check if the specified variable is used in 'private' clause.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPPrivateDecl(ValueDecl *D, unsigned Level);

/// Sets OpenMP capture kind (OMPC_private, OMPC_firstprivate, OMPC_map etc.)
/// for \p FD based on DSA for the provided corresponding captured declaration
/// \p D.
void setOpenMPCaptureKind(FieldDecl *FD, ValueDecl *D, unsigned Level);

/// \brief Check if the specified variable is captured  by 'target' directive.
/// \param Level Relative level of nested OpenMP construct for that the check
/// is performed.
bool isOpenMPTargetCapturedDecl(ValueDecl *D, unsigned Level);

ExprResult PerformOpenMPImplicitIntegerConversion(SourceLocation OpLoc,
                                                  Expr *Op);
/// \brief Called on start of new data sharing attribute block.
void StartOpenMPDSABlock(OpenMPDirectiveKind K,
                         const DeclarationNameInfo &DirName, Scope *CurScope,
                         SourceLocation Loc);
/// \brief Start analysis of clauses.
void StartOpenMPClause(OpenMPClauseKind K);
/// \brief End analysis of clauses.
void EndOpenMPClause();
/// \brief Called on end of data sharing attribute block.
void EndOpenMPDSABlock(Stmt *CurDirective);

/// \brief Check if the current region is an OpenMP loop region and if it is,
/// mark loop control variable, used in \p Init for loop initialization, as
/// private by default.
/// \param Init First part of the for loop.
void ActOnOpenMPLoopInitialization(SourceLocation ForLoc, Stmt *Init);

// OpenMP directives and clauses.
/// \brief Called on correct id-expression from the '#pragma omp
/// threadprivate'.
ExprResult ActOnOpenMPIdExpression(Scope *CurScope,
                                   CXXScopeSpec &ScopeSpec,
                                   const DeclarationNameInfo &Id);
/// \brief Called on well-formed '#pragma omp threadprivate'.
DeclGroupPtrTy ActOnOpenMPThreadprivateDirective(
                                   SourceLocation Loc,
                                   ArrayRef<Expr *> VarList);
/// \brief Builds a new OpenMPThreadPrivateDecl and checks its correctness.
OMPThreadPrivateDecl *CheckOMPThreadPrivateDecl(
                                   SourceLocation Loc,
                                   ArrayRef<Expr *> VarList);
/// \brief Check if the specified type is allowed to be used in 'omp declare
/// reduction' construct.
QualType ActOnOpenMPDeclareReductionType(SourceLocation TyLoc,
                                         TypeResult ParsedType);
/// \brief Called on start of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveStart(
    Scope *S, DeclContext *DC, DeclarationName Name,
    ArrayRef<std::pair<QualType, SourceLocation>> ReductionTypes,
    AccessSpecifier AS, Decl *PrevDeclInScope = nullptr);
/// \brief Initialize declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerStart(Scope *S, Decl *D);
/// \brief Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionCombinerEnd(Decl *D, Expr *Combiner);
/// \brief Initialize declare reduction construct initializer.
/// \return omp_priv variable.
VarDecl *ActOnOpenMPDeclareReductionInitializerStart(Scope *S, Decl *D);
/// \brief Finish current declare reduction construct initializer.
void ActOnOpenMPDeclareReductionInitializerEnd(Decl *D, Expr *Initializer,
                                               VarDecl *OmpPrivParm);
/// \brief Called at the end of '#pragma omp declare reduction'.
DeclGroupPtrTy ActOnOpenMPDeclareReductionDirectiveEnd(
    Scope *S, DeclGroupPtrTy DeclReductions, bool IsValid);

/// Called on the start of target region i.e. '#pragma omp declare target'.
bool ActOnStartOpenMPDeclareTargetDirective(SourceLocation Loc);
/// Called at the end of target region i.e. '#pragme omp end declare target'.
void ActOnFinishOpenMPDeclareTargetDirective();
/// Called on correct id-expression from the '#pragma omp declare target'.
void ActOnOpenMPDeclareTargetName(Scope *CurScope, CXXScopeSpec &ScopeSpec,
                                  const DeclarationNameInfo &Id,
                                  OMPDeclareTargetDeclAttr::MapTypeTy MT,
                                  NamedDeclSetType &SameDirectiveDecls);
/// Check declaration inside target region.
void checkDeclIsAllowedInOpenMPTarget(Expr *E, Decl *D,
                                      SourceLocation IdLoc = SourceLocation());
/// Return true inside OpenMP declare target region.
bool isInOpenMPDeclareTargetContext() const {
  return IsInOpenMPDeclareTargetContext;
}
/// Return true inside OpenMP target region.
bool isInOpenMPTargetExecutionDirective() const;
/// Return true if (un)supported features for the current target should be
/// diagnosed if OpenMP (offloading) is enabled.
bool shouldDiagnoseTargetSupportFromOpenMP() const {
  return !getLangOpts().OpenMPIsDevice || isInOpenMPDeclareTargetContext() ||
    isInOpenMPTargetExecutionDirective();
}

/// Return the number of captured regions created for an OpenMP directive.
static int getOpenMPCaptureLevels(OpenMPDirectiveKind Kind);

/// \brief Initialization of captured region for OpenMP region.
void ActOnOpenMPRegionStart(OpenMPDirectiveKind DKind, Scope *CurScope);
/// \brief End of OpenMP region.
///
/// \param S Statement associated with the current OpenMP region.
/// \param Clauses List of clauses for the current OpenMP region.
///
/// \returns Statement for finished OpenMP region.
StmtResult ActOnOpenMPRegionEnd(StmtResult S, ArrayRef<OMPClause *> Clauses);
StmtResult ActOnOpenMPExecutableDirective(
    OpenMPDirectiveKind Kind, const DeclarationNameInfo &DirName,
    OpenMPDirectiveKind CancelRegion, ArrayRef<OMPClause *> Clauses,
    Stmt *AStmt, SourceLocation StartLoc, SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp parallel' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt,
                                        SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp for' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp for simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp sections' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp section' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSectionDirective(Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp single' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPSingleDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp master' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPMasterDirective(Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp critical' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPCriticalDirective(const DeclarationNameInfo &DirName,
                                        ArrayRef<OMPClause *> Clauses,
                                        Stmt *AStmt, SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp parallel for' after parsing
/// of the  associated statement.
StmtResult ActOnOpenMPParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp parallel for simd' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp parallel sections' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPParallelSectionsDirective(ArrayRef<OMPClause *> Clauses,
                                                Stmt *AStmt,
                                                SourceLocation StartLoc,
                                                SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp task' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTaskDirective(ArrayRef<OMPClause *> Clauses,
                                    Stmt *AStmt, SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskyield'.
StmtResult ActOnOpenMPTaskyieldDirective(SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp barrier'.
StmtResult ActOnOpenMPBarrierDirective(SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskwait'.
StmtResult ActOnOpenMPTaskwaitDirective(SourceLocation StartLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp taskgroup'.
StmtResult ActOnOpenMPTaskgroupDirective(ArrayRef<OMPClause *> Clauses,
                                         Stmt *AStmt, SourceLocation StartLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp flush'.
StmtResult ActOnOpenMPFlushDirective(ArrayRef<OMPClause *> Clauses,
                                     SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp ordered' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPOrderedDirective(ArrayRef<OMPClause *> Clauses,
                                       Stmt *AStmt, SourceLocation StartLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp atomic' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetDirective(ArrayRef<OMPClause *> Clauses,
                                      Stmt *AStmt, SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target data' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTargetDataDirective(ArrayRef<OMPClause *> Clauses,
                                          Stmt *AStmt, SourceLocation StartLoc,
                                          SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target enter data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetEnterDataDirective(ArrayRef<OMPClause *> Clauses,
                                               SourceLocation StartLoc,
                                               SourceLocation EndLoc,
                                               Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp target exit data' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetExitDataDirective(ArrayRef<OMPClause *> Clauses,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc,
                                              Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp target parallel' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelDirective(ArrayRef<OMPClause *> Clauses,
                                              Stmt *AStmt,
                                              SourceLocation StartLoc,
                                              SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp target parallel for' after
/// parsing of the  associated statement.
StmtResult ActOnOpenMPTargetParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                     Stmt *AStmt, SourceLocation StartLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed '\#pragma omp cancellation point'.
StmtResult
ActOnOpenMPCancellationPointDirective(SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// \brief Called on well-formed '\#pragma omp cancel'.
StmtResult ActOnOpenMPCancelDirective(ArrayRef<OMPClause *> Clauses,
                                      SourceLocation StartLoc,
                                      SourceLocation EndLoc,
                                      OpenMPDirectiveKind CancelRegion);
/// \brief Called on well-formed '\#pragma omp taskloop' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTaskLoopDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp taskloop simd' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTaskLoopSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target update'.
StmtResult ActOnOpenMPTargetUpdateDirective(ArrayRef<OMPClause *> Clauses,
                                            SourceLocation StartLoc,
                                            SourceLocation EndLoc,
                                            Stmt *AStmt);
/// \brief Called on well-formed '\#pragma omp distribute parallel for' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target parallel for simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// \brief Called on well-formed '\#pragma omp target simd' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTargetSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute' after parsing of
/// the associated statement.
StmtResult ActOnOpenMPTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute simd' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for simd'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams' after parsing of the
/// associated statement.
StmtResult ActOnOpenMPTargetTeamsDirective(ArrayRef<OMPClause *> Clauses,
                                           Stmt *AStmt,
                                           SourceLocation StartLoc,
                                           SourceLocation EndLoc);
/// Called on well-formed '\#pragma omp target teams distribute' after parsing
/// of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for'
/// after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute parallel for
/// simd' after parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeParallelForSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);
/// Called on well-formed '\#pragma omp target teams distribute simd' after
/// parsing of the associated statement.
StmtResult ActOnOpenMPTargetTeamsDistributeSimdDirective(
    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
    SourceLocation EndLoc,
    llvm::DenseMap<ValueDecl *, Expr *> &VarsWithImplicitDSA);

/// Checks correctness of linear modifiers.
bool CheckOpenMPLinearModifier(OpenMPLinearClauseKind LinKind,
                               SourceLocation LinLoc);
/// Checks that the specified declaration matches requirements for the linear
/// decls.
bool CheckOpenMPLinearDecl(ValueDecl *D, SourceLocation ELoc,
                           OpenMPLinearClauseKind LinKind, QualType Type);

/// \brief Called on well-formed '\#pragma omp declare simd' after parsing of
/// the associated method/function.
DeclGroupPtrTy ActOnOpenMPDeclareSimdDirective(
    DeclGroupPtrTy DG, OMPDeclareSimdDeclAttr::BranchStateTy BS,
    Expr *Simdlen, ArrayRef<Expr *> Uniforms, ArrayRef<Expr *> Aligneds,
    ArrayRef<Expr *> Alignments, ArrayRef<Expr *> Linears,
    ArrayRef<unsigned> LinModifiers, ArrayRef<Expr *> Steps, SourceRange SR);

OMPClause *ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind,
                                       Expr *Expr,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed 'if' clause.
OMPClause *ActOnOpenMPIfClause(OpenMPDirectiveKind NameModifier,
                               Expr *Condition, SourceLocation StartLoc,
                               SourceLocation LParenLoc,
                               SourceLocation NameModifierLoc,
                               SourceLocation ColonLoc,
                               SourceLocation EndLoc);
/// \brief Called on well-formed 'final' clause.
OMPClause *ActOnOpenMPFinalClause(Expr *Condition, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'num_threads' clause.
OMPClause *ActOnOpenMPNumThreadsClause(Expr *NumThreads,
                                       SourceLocation StartLoc,
                                       SourceLocation LParenLoc,
                                       SourceLocation EndLoc);
/// \brief Called on well-formed 'safelen' clause.
OMPClause *ActOnOpenMPSafelenClause(Expr *Length,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'simdlen' clause.
OMPClause *ActOnOpenMPSimdlenClause(Expr *Length, SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'collapse' clause.
OMPClause *ActOnOpenMPCollapseClause(Expr *NumForLoops,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'ordered' clause.
OMPClause *
ActOnOpenMPOrderedClause(SourceLocation StartLoc, SourceLocation EndLoc,
                         SourceLocation LParenLoc = SourceLocation(),
                         Expr *NumForLoops = nullptr);
/// \brief Called on well-formed 'grainsize' clause.
OMPClause *ActOnOpenMPGrainsizeClause(Expr *Size, SourceLocation StartLoc,
                                      SourceLocation LParenLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed 'num_tasks' clause.
OMPClause *ActOnOpenMPNumTasksClause(Expr *NumTasks, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'hint' clause.
OMPClause *ActOnOpenMPHintClause(Expr *Hint, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc);

OMPClause *ActOnOpenMPSimpleClause(OpenMPClauseKind Kind,
                                   unsigned Argument,
                                   SourceLocation ArgumentLoc,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'default' clause.
OMPClause *ActOnOpenMPDefaultClause(OpenMPDefaultClauseKind Kind,
                                    SourceLocation KindLoc,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'proc_bind' clause.
OMPClause *ActOnOpenMPProcBindClause(OpenMPProcBindClauseKind Kind,
                                     SourceLocation KindLoc,
                                     SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);

OMPClause *ActOnOpenMPSingleExprWithArgClause(
    OpenMPClauseKind Kind, ArrayRef<unsigned> Arguments, Expr *Expr,
    SourceLocation StartLoc, SourceLocation LParenLoc,
    ArrayRef<SourceLocation> ArgumentsLoc, SourceLocation DelimLoc,
    SourceLocation EndLoc);
/// \brief Called on well-formed 'schedule' clause.
OMPClause *ActOnOpenMPScheduleClause(
    OpenMPScheduleClauseModifier M1, OpenMPScheduleClauseModifier M2,
    OpenMPScheduleClauseKind Kind, Expr *ChunkSize, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation M1Loc, SourceLocation M2Loc,
    SourceLocation KindLoc, SourceLocation CommaLoc, SourceLocation EndLoc);

OMPClause *ActOnOpenMPClause(OpenMPClauseKind Kind, SourceLocation StartLoc,
                             SourceLocation EndLoc);
/// \brief Called on well-formed 'nowait' clause.
OMPClause *ActOnOpenMPNowaitClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'untied' clause.
OMPClause *ActOnOpenMPUntiedClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'mergeable' clause.
OMPClause *ActOnOpenMPMergeableClause(SourceLocation StartLoc,
                                      SourceLocation EndLoc);
/// \brief Called on well-formed 'read' clause.
OMPClause *ActOnOpenMPReadClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// \brief Called on well-formed 'write' clause.
OMPClause *ActOnOpenMPWriteClause(SourceLocation StartLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'update' clause.
OMPClause *ActOnOpenMPUpdateClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'capture' clause.
OMPClause *ActOnOpenMPCaptureClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'seq_cst' clause.
OMPClause *ActOnOpenMPSeqCstClause(SourceLocation StartLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'threads' clause.
OMPClause *ActOnOpenMPThreadsClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'simd' clause.
OMPClause *ActOnOpenMPSIMDClause(SourceLocation StartLoc,
                                 SourceLocation EndLoc);
/// \brief Called on well-formed 'nogroup' clause.
OMPClause *ActOnOpenMPNogroupClause(SourceLocation StartLoc,
                                    SourceLocation EndLoc);

OMPClause *ActOnOpenMPVarListClause(
    OpenMPClauseKind Kind, ArrayRef<Expr *> Vars, Expr *TailExpr,
    SourceLocation StartLoc, SourceLocation LParenLoc,
    SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId, OpenMPDependClauseKind DepKind,
    OpenMPLinearClauseKind LinKind, OpenMPMapClauseKind MapTypeModifier,
    OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
    SourceLocation DepLinMapLoc);
/// \brief Called on well-formed 'private' clause.
OMPClause *ActOnOpenMPPrivateClause(ArrayRef<Expr *> VarList,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'firstprivate' clause.
OMPClause *ActOnOpenMPFirstprivateClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc);
/// \brief Called on well-formed 'lastprivate' clause.
OMPClause *ActOnOpenMPLastprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'shared' clause.
OMPClause *ActOnOpenMPSharedClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'reduction' clause.
OMPClause *ActOnOpenMPReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'task_reduction' clause.
OMPClause *ActOnOpenMPTaskReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// Called on well-formed 'in_reduction' clause.
OMPClause *ActOnOpenMPInReductionClause(
    ArrayRef<Expr *> VarList, SourceLocation StartLoc,
    SourceLocation LParenLoc, SourceLocation ColonLoc, SourceLocation EndLoc,
    CXXScopeSpec &ReductionIdScopeSpec,
    const DeclarationNameInfo &ReductionId,
    ArrayRef<Expr *> UnresolvedReductions = llvm::None);
/// \brief Called on well-formed 'linear' clause.
OMPClause *
ActOnOpenMPLinearClause(ArrayRef<Expr *> VarList, Expr *Step,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        OpenMPLinearClauseKind LinKind, SourceLocation LinLoc,
                        SourceLocation ColonLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'aligned' clause.
OMPClause *ActOnOpenMPAlignedClause(ArrayRef<Expr *> VarList,
                                    Expr *Alignment,
                                    SourceLocation StartLoc,
                                    SourceLocation LParenLoc,
                                    SourceLocation ColonLoc,
                                    SourceLocation EndLoc);
/// \brief Called on well-formed 'copyin' clause.
OMPClause *ActOnOpenMPCopyinClause(ArrayRef<Expr *> VarList,
                                   SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'copyprivate' clause.
OMPClause *ActOnOpenMPCopyprivateClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'flush' pseudo clause.
OMPClause *ActOnOpenMPFlushClause(ArrayRef<Expr *> VarList,
                                  SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);
/// \brief Called on well-formed 'depend' clause.
OMPClause *
ActOnOpenMPDependClause(OpenMPDependClauseKind DepKind, SourceLocation DepLoc,
                        SourceLocation ColonLoc, ArrayRef<Expr *> VarList,
                        SourceLocation StartLoc, SourceLocation LParenLoc,
                        SourceLocation EndLoc);
/// \brief Called on well-formed 'device' clause.
OMPClause *ActOnOpenMPDeviceClause(Expr *Device, SourceLocation StartLoc,
                                   SourceLocation LParenLoc,
                                   SourceLocation EndLoc);
/// \brief Called on well-formed 'map' clause.
OMPClause *
ActOnOpenMPMapClause(OpenMPMapClauseKind MapTypeModifier,
                     OpenMPMapClauseKind MapType, bool IsMapTypeImplicit,
                     SourceLocation MapLoc, SourceLocation ColonLoc,
                     ArrayRef<Expr *> VarList, SourceLocation StartLoc,
                     SourceLocation LParenLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'num_teams' clause.
OMPClause *ActOnOpenMPNumTeamsClause(Expr *NumTeams, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'thread_limit' clause.
OMPClause *ActOnOpenMPThreadLimitClause(Expr *ThreadLimit,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);
/// \brief Called on well-formed 'priority' clause.
OMPClause *ActOnOpenMPPriorityClause(Expr *Priority, SourceLocation StartLoc,
                                     SourceLocation LParenLoc,
                                     SourceLocation EndLoc);
/// \brief Called on well-formed 'dist_schedule' clause.
OMPClause *ActOnOpenMPDistScheduleClause(
    OpenMPDistScheduleClauseKind Kind, Expr *ChunkSize,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation KindLoc,
    SourceLocation CommaLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'defaultmap' clause.
OMPClause *ActOnOpenMPDefaultmapClause(
    OpenMPDefaultmapClauseModifier M, OpenMPDefaultmapClauseKind Kind,
    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation MLoc,
    SourceLocation KindLoc, SourceLocation EndLoc);
/// \brief Called on well-formed 'to' clause.
OMPClause *ActOnOpenMPToClause(ArrayRef<Expr *> VarList,
                               SourceLocation StartLoc,
                               SourceLocation LParenLoc,
                               SourceLocation EndLoc);
/// \brief Called on well-formed 'from' clause.
OMPClause *ActOnOpenMPFromClause(ArrayRef<Expr *> VarList,
                                 SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc);
/// Called on well-formed 'use_device_ptr' clause.
OMPClause *ActOnOpenMPUseDevicePtrClause(ArrayRef<Expr *> VarList,
                                         SourceLocation StartLoc,
                                         SourceLocation LParenLoc,
                                         SourceLocation EndLoc);
/// Called on well-formed 'is_device_ptr' clause.
OMPClause *ActOnOpenMPIsDevicePtrClause(ArrayRef<Expr *> VarList,
                                        SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
                                        SourceLocation EndLoc);

/// \brief The kind of conversion being performed.
enum CheckedConversionKind {
  /// \brief An implicit conversion.
  CCK_ImplicitConversion,
  /// \brief A C-style cast.
  CCK_CStyleCast,
  /// \brief A functional-style cast.
  CCK_FunctionalCast,
  /// \brief A cast other than a C-style cast.
  CCK_OtherCast
};

/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit
/// cast.  If there is already an implicit cast, merge into the existing one.
/// If isLvalue, the result of the cast is an lvalue.
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK,
                             ExprValueKind VK = VK_RValue,
                             const CXXCastPath *BasePath = nullptr,
                             CheckedConversionKind CCK
                                = CCK_ImplicitConversion);

/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
/// to the conversion from scalar type ScalarTy to the Boolean type.
static CastKind ScalarTypeToBooleanCastKind(QualType ScalarTy);

/// IgnoredValueConversions - Given that an expression's result is
/// syntactically ignored, perform any conversions that are
/// required.
ExprResult IgnoredValueConversions(Expr *E);

// UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts
// functions and arrays to their respective pointers (C99 6.3.2.1).
ExprResult UsualUnaryConversions(Expr *E);

/// CallExprUnaryConversions - a special case of an unary conversion
/// performed on a function designator of a call expression.
ExprResult CallExprUnaryConversions(Expr *E);

// DefaultFunctionArrayConversion - converts functions and arrays
// to their respective pointers (C99 6.3.2.1).
ExprResult DefaultFunctionArrayConversion(Expr *E, bool Diagnose = true);

// DefaultFunctionArrayLvalueConversion - converts functions and
// arrays to their respective pointers and performs the
// lvalue-to-rvalue conversion.
ExprResult DefaultFunctionArrayLvalueConversion(Expr *E,
                                                bool Diagnose = true);

// DefaultLvalueConversion - performs lvalue-to-rvalue conversion on
// the operand.  This is DefaultFunctionArrayLvalueConversion,
// except that it assumes the operand isn't of function or array
// type.
ExprResult DefaultLvalueConversion(Expr *E);

// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
// do not have a prototype. Integer promotions are performed on each
// argument, and arguments that have type float are promoted to double.
ExprResult DefaultArgumentPromotion(Expr *E);

/// If \p E is a prvalue denoting an unmaterialized temporary, materialize
/// it as an xvalue. In C++98, the result will still be a prvalue, because
/// we don't have xvalues there.
ExprResult TemporaryMaterializationConversion(Expr *E);

// Used for emitting the right warning by DefaultVariadicArgumentPromotion
enum VariadicCallType {
  VariadicFunction,
  VariadicBlock,
  VariadicMethod,
  VariadicConstructor,
  VariadicDoesNotApply
};

VariadicCallType getVariadicCallType(FunctionDecl *FDecl,
                                     const FunctionProtoType *Proto,
                                     Expr *Fn);

// Used for determining in which context a type is allowed to be passed to a
// vararg function.
enum VarArgKind {
  VAK_Valid,
  VAK_ValidInCXX11,
  VAK_Undefined,
  VAK_MSVCUndefined,
  VAK_Invalid
};

// Determines which VarArgKind fits an expression.
VarArgKind isValidVarArgType(const QualType &Ty);

/// Check to see if the given expression is a valid argument to a variadic
/// function, issuing a diagnostic if not.
void checkVariadicArgument(const Expr *E, VariadicCallType CT);

/// Check to see if a given expression could have '.c_str()' called on it.
bool hasCStrMethod(const Expr *E);

/// GatherArgumentsForCall - Collector argument expressions for various
/// form of call prototypes.
bool GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
                            const FunctionProtoType *Proto,
                            unsigned FirstParam, ArrayRef<Expr *> Args,
                            SmallVectorImpl<Expr *> &AllArgs,
                            VariadicCallType CallType = VariadicDoesNotApply,
                            bool AllowExplicit = false,
                            bool IsListInitialization = false);

// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
// will create a runtime trap if the resulting type is not a POD type.
ExprResult DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
                                            FunctionDecl *FDecl);

// UsualArithmeticConversions - performs the UsualUnaryConversions on it's
// operands and then handles various conversions that are common to binary
// operators (C99 6.3.1.8). If both operands aren't arithmetic, this
// routine returns the first non-arithmetic type found. The client is
// responsible for emitting appropriate error diagnostics.
QualType UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
                                    bool IsCompAssign = false);

/// AssignConvertType - All of the 'assignment' semantic checks return this
/// enum to indicate whether the assignment was allowed.  These checks are
/// done for simple assignments, as well as initialization, return from
/// function, argument passing, etc.  The query is phrased in terms of a
/// source and destination type.
enum AssignConvertType {
  /// Compatible - the types are compatible according to the standard.
  Compatible,

  /// PointerToInt - The assignment converts a pointer to an int, which we
  /// accept as an extension.
  PointerToInt,

  /// IntToPointer - The assignment converts an int to a pointer, which we
  /// accept as an extension.
  IntToPointer,

  /// FunctionVoidPointer - The assignment is between a function pointer and
  /// void*, which the standard doesn't allow, but we accept as an extension.
  FunctionVoidPointer,

  /// IncompatiblePointer - The assignment is between two pointers types that
  /// are not compatible, but we accept them as an extension.
  IncompatiblePointer,

  /// IncompatiblePointerSign - The assignment is between two pointers types
  /// which point to integers which have a different sign, but are otherwise
  /// identical. This is a subset of the above, but broken out because it's by
  /// far the most common case of incompatible pointers.
  IncompatiblePointerSign,

  /// CompatiblePointerDiscardsQualifiers - The assignment discards
  /// c/v/r qualifiers, which we accept as an extension.
  CompatiblePointerDiscardsQualifiers,

  /// IncompatiblePointerDiscardsQualifiers - The assignment
  /// discards qualifiers that we don't permit to be discarded,
  /// like address spaces.
  IncompatiblePointerDiscardsQualifiers,

  /// IncompatibleNestedPointerQualifiers - The assignment is between two
  /// nested pointer types, and the qualifiers other than the first two
  /// levels differ e.g. char ** -> const char **, but we accept them as an
  /// extension.
  IncompatibleNestedPointerQualifiers,

  /// IncompatibleVectors - The assignment is between two vector types that
  /// have the same size, which we accept as an extension.
  IncompatibleVectors,

  /// IntToBlockPointer - The assignment converts an int to a block
  /// pointer. We disallow this.
  IntToBlockPointer,

  /// IncompatibleBlockPointer - The assignment is between two block
  /// pointers types that are not compatible.
  IncompatibleBlockPointer,

  /// IncompatibleObjCQualifiedId - The assignment is between a qualified
  /// id type and something else (that is incompatible with it). For example,
  /// "id <XXX>" = "Foo *", where "Foo *" doesn't implement the XXX protocol.
  IncompatibleObjCQualifiedId,

  /// IncompatibleObjCWeakRef - Assigning a weak-unavailable object to an
  /// object with __weak qualifier.
  IncompatibleObjCWeakRef,

  /// Incompatible - We reject this conversion outright, it is invalid to
  /// represent it in the AST.
  Incompatible
};

/// DiagnoseAssignmentResult - Emit a diagnostic, if required, for the
/// assignment conversion type specified by ConvTy.  This returns true if the
/// conversion was invalid or false if the conversion was accepted.
bool DiagnoseAssignmentResult(AssignConvertType ConvTy,
                              SourceLocation Loc,
                              QualType DstType, QualType SrcType,
                              Expr *SrcExpr, AssignmentAction Action,
                              bool *Complained = nullptr);

/// IsValueInFlagEnum - Determine if a value is allowed as part of a flag
/// enum. If AllowMask is true, then we also allow the complement of a valid
/// value, to be used as a mask.
bool IsValueInFlagEnum(const EnumDecl *ED, const llvm::APInt &Val,
                       bool AllowMask) const;

/// DiagnoseAssignmentEnum - Warn if assignment to enum is a constant
/// integer not in the range of enum values.
void DiagnoseAssignmentEnum(QualType DstType, QualType SrcType,
                            Expr *SrcExpr);

/// CheckAssignmentConstraints - Perform type checking for assignment,
/// argument passing, variable initialization, and function return values.
/// C99 6.5.16.
AssignConvertType CheckAssignmentConstraints(SourceLocation Loc,
                                             QualType LHSType,
                                             QualType RHSType);

/// Check assignment constraints and optionally prepare for a conversion of
/// the RHS to the LHS type. The conversion is prepared for if ConvertRHS
/// is true.
AssignConvertType CheckAssignmentConstraints(QualType LHSType,
                                             ExprResult &RHS,
                                             CastKind &Kind,
                                             bool ConvertRHS = true);

/// Check assignment constraints for an assignment of RHS to LHSType.
///
/// \param LHSType The destination type for the assignment.
/// \param RHS The source expression for the assignment.
/// \param Diagnose If \c true, diagnostics may be produced when checking
///        for assignability. If a diagnostic is produced, \p RHS will be
///        set to ExprError(). Note that this function may still return
///        without producing a diagnostic, even for an invalid assignment.
/// \param DiagnoseCFAudited If \c true, the target is a function parameter
///        in an audited Core Foundation API and does not need to be checked
///        for ARC retain issues.
/// \param ConvertRHS If \c true, \p RHS will be updated to model the
///        conversions necessary to perform the assignment. If \c false,
///        \p Diagnose must also be \c false.
AssignConvertType CheckSingleAssignmentConstraints(
    QualType LHSType, ExprResult &RHS, bool Diagnose = true,
    bool DiagnoseCFAudited = false, bool ConvertRHS = true);

// \brief If the lhs type is a transparent union, check whether we
// can initialize the transparent union with the given expression.
AssignConvertType CheckTransparentUnionArgumentConstraints(QualType ArgType,
                                                           ExprResult &RHS);

bool IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType);

bool CheckExceptionSpecCompatibility(Expr *From, QualType ToType);

ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit = false);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     AssignmentAction Action,
                                     bool AllowExplicit,
                                     ImplicitConversionSequence& ICS);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const ImplicitConversionSequence& ICS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK
                                        = CCK_ImplicitConversion);
ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
                                     const StandardConversionSequence& SCS,
                                     AssignmentAction Action,
                                     CheckedConversionKind CCK);

/// the following "Check" methods will return a valid/converted QualType
/// or a null QualType (indicating an error diagnostic was issued).

/// type checking binary operators (subroutines of CreateBuiltinBinOp).
QualType InvalidOperands(SourceLocation Loc, ExprResult &LHS,
                         ExprResult &RHS);
QualType InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
                               ExprResult &RHS);
QualType CheckPointerToMemberOperands( // C++ 5.5
  ExprResult &LHS, ExprResult &RHS, ExprValueKind &VK,
  SourceLocation OpLoc, bool isIndirect);
QualType CheckMultiplyDivideOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign,
  bool IsDivide);
QualType CheckRemainderOperands( // C99 6.5.5
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  bool IsCompAssign = false);
QualType CheckAdditionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, QualType* CompLHSTy = nullptr);
QualType CheckSubtractionOperands( // C99 6.5.6
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  QualType* CompLHSTy = nullptr);
QualType CheckShiftOperands( // C99 6.5.7
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, bool IsCompAssign = false);
QualType CheckCompareOperands( // C99 6.5.8/9
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc, bool isRelational);
QualType CheckBitwiseOperands( // C99 6.5.[10...12]
    ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
    BinaryOperatorKind Opc);
QualType CheckLogicalOperands( // C99 6.5.[13,14]
  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
  BinaryOperatorKind Opc);
// CheckAssignmentOperands is used for both simple and compound assignment.
// For simple assignment, pass both expressions and a null converted type.
// For compound assignment, pass both expressions and the converted type.
QualType CheckAssignmentOperands( // C99 6.5.16.[1,2]
  Expr *LHSExpr, ExprResult &RHS, SourceLocation Loc, QualType CompoundType);

ExprResult checkPseudoObjectIncDec(Scope *S, SourceLocation OpLoc,
                                   UnaryOperatorKind Opcode, Expr *Op);
ExprResult checkPseudoObjectAssignment(Scope *S, SourceLocation OpLoc,
                                       BinaryOperatorKind Opcode,
                                       Expr *LHS, Expr *RHS);
ExprResult checkPseudoObjectRValue(Expr *E);
Expr *recreateSyntacticForm(PseudoObjectExpr *E);

QualType CheckConditionalOperands( // C99 6.5.15
  ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation QuestionLoc);
QualType CXXCheckConditionalOperands( // C++ 5.16
  ExprResult &cond, ExprResult &lhs, ExprResult &rhs,
  ExprValueKind &VK, ExprObjectKind &OK, SourceLocation questionLoc);
QualType FindCompositePointerType(SourceLocation Loc, Expr *&E1, Expr *&E2,
                                  bool ConvertArgs = true);
QualType FindCompositePointerType(SourceLocation Loc,
                                  ExprResult &E1, ExprResult &E2,
                                  bool ConvertArgs = true) {
  Expr *E1Tmp = E1.get(), *E2Tmp = E2.get();
  QualType Composite =
      FindCompositePointerType(Loc, E1Tmp, E2Tmp, ConvertArgs);
  E1 = E1Tmp;
  E2 = E2Tmp;
  return Composite;
}

QualType FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
                                      SourceLocation QuestionLoc);

bool DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
                                SourceLocation QuestionLoc);

void DiagnoseAlwaysNonNullPointer(Expr *E,
                                  Expr::NullPointerConstantKind NullType,
                                  bool IsEqual, SourceRange Range);

/// type checking for vector binary operators.
QualType CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
                             SourceLocation Loc, bool IsCompAssign,
                             bool AllowBothBool, bool AllowBoolConversion);
QualType GetSignedVectorType(QualType V);
QualType CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc,
                                    BinaryOperatorKind Opc);
QualType CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
                                    SourceLocation Loc);

bool areLaxCompatibleVectorTypes(QualType srcType, QualType destType);
bool isLaxVectorConversion(QualType srcType, QualType destType);

/// type checking declaration initializers (C99 6.7.8)
bool CheckForConstantInitializer(Expr *e, QualType t);

// type checking C++ declaration initializers (C++ [dcl.init]).

/// ReferenceCompareResult - Expresses the result of comparing two
/// types (cv1 T1 and cv2 T2) to determine their compatibility for the
/// purposes of initialization by reference (C++ [dcl.init.ref]p4).
enum ReferenceCompareResult {
  /// Ref_Incompatible - The two types are incompatible, so direct
  /// reference binding is not possible.
  Ref_Incompatible = 0,
  /// Ref_Related - The two types are reference-related, which means
  /// that their unqualified forms (T1 and T2) are either the same
  /// or T1 is a base class of T2.
  Ref_Related,
  /// Ref_Compatible - The two types are reference-compatible.
  Ref_Compatible
};

ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc,
                                                    QualType T1, QualType T2,
                                                    bool &DerivedToBase,
                                                    bool &ObjCConversion,
                                              bool &ObjCLifetimeConversion);

ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
                               Expr *CastExpr, CastKind &CastKind,
                               ExprValueKind &VK, CXXCastPath &Path);

/// \brief Force an expression with unknown-type to an expression of the
/// given type.
ExprResult forceUnknownAnyToType(Expr *E, QualType ToType);

/// \brief Type-check an expression that's being passed to an
/// __unknown_anytype parameter.
ExprResult checkUnknownAnyArg(SourceLocation callLoc,
                              Expr *result, QualType &paramType);

// CheckVectorCast - check type constraints for vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size.
// returns true if the cast is invalid
bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
                     CastKind &Kind);

/// \brief Prepare `SplattedExpr` for a vector splat operation, adding
/// implicit casts if necessary.
ExprResult prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr);

// CheckExtVectorCast - check type constraints for extended vectors.
// Since vectors are an extension, there are no C standard reference for this.
// We allow casting between vectors and integer datatypes of the same size,
// or vectors and the element type of that vector.
// returns the cast expr
ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr,
                              CastKind &Kind);

ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type,
                                      SourceLocation LParenLoc,
                                      Expr *CastExpr,
                                      SourceLocation RParenLoc);

enum ARCConversionResult { ACR_okay, ACR_unbridged, ACR_error };

/// \brief Checks for invalid conversions and casts between
/// retainable pointers and other pointer kinds for ARC and Weak.
ARCConversionResult CheckObjCConversion(SourceRange castRange,
                                        QualType castType, Expr *&op,
                                        CheckedConversionKind CCK,
                                        bool Diagnose = true,
                                        bool DiagnoseCFAudited = false,
                                        BinaryOperatorKind Opc = BO_PtrMemD
                                        );

Expr *stripARCUnbridgedCast(Expr *e);
void diagnoseARCUnbridgedCast(Expr *e);

bool CheckObjCARCUnavailableWeakConversion(QualType castType,
                                           QualType ExprType);

/// checkRetainCycles - Check whether an Objective-C message send
/// might create an obvious retain cycle.
void checkRetainCycles(ObjCMessageExpr *msg);
void checkRetainCycles(Expr *receiver, Expr *argument);
void checkRetainCycles(VarDecl *Var, Expr *Init);

/// checkUnsafeAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained type.
bool checkUnsafeAssigns(SourceLocation Loc, QualType LHS, Expr *RHS);

/// checkUnsafeExprAssigns - Check whether +1 expr is being assigned
/// to weak/__unsafe_unretained expression.
void checkUnsafeExprAssigns(SourceLocation Loc, Expr *LHS, Expr *RHS);

/// CheckMessageArgumentTypes - Check types in an Obj-C message send.
/// \param Method - May be null.
/// \param [out] ReturnType - The return type of the send.
/// \return true iff there were any incompatible types.
bool CheckMessageArgumentTypes(QualType ReceiverType,
                               MultiExprArg Args, Selector Sel,
                               ArrayRef<SourceLocation> SelectorLocs,
                               ObjCMethodDecl *Method, bool isClassMessage,
                               bool isSuperMessage,
                               SourceLocation lbrac, SourceLocation rbrac,
                               SourceRange RecRange,
                               QualType &ReturnType, ExprValueKind &VK);

/// \brief Determine the result of a message send expression based on
/// the type of the receiver, the method expected to receive the message,
/// and the form of the message send.
QualType getMessageSendResultType(QualType ReceiverType,
                                  ObjCMethodDecl *Method,
                                  bool isClassMessage, bool isSuperMessage);

/// \brief If the given expression involves a message send to a method
/// with a related result type, emit a note describing what happened.
void EmitRelatedResultTypeNote(const Expr *E);

/// \brief Given that we had incompatible pointer types in a return
/// statement, check whether we're in a method with a related result
/// type, and if so, emit a note describing what happened.
void EmitRelatedResultTypeNoteForReturn(QualType destType);

class ConditionResult {
  Decl *ConditionVar;
  FullExprArg Condition;
  bool Invalid;
  bool HasKnownValue;
  bool KnownValue;

  friend class Sema;
  ConditionResult(Sema &S, Decl *ConditionVar, FullExprArg Condition,
                  bool IsConstexpr)
      : ConditionVar(ConditionVar), Condition(Condition), Invalid(false),
        HasKnownValue(IsConstexpr && Condition.get() &&
                      !Condition.get()->isValueDependent()),
        KnownValue(HasKnownValue &&
                   !!Condition.get()->EvaluateKnownConstInt(S.Context)) {}
  explicit ConditionResult(bool Invalid)
      : ConditionVar(nullptr), Condition(nullptr), Invalid(Invalid),
        HasKnownValue(false), KnownValue(false) {}

public:
  ConditionResult() : ConditionResult(false) {}
  bool isInvalid() const { return Invalid; }
  std::pair<VarDecl *, Expr *> get() const {
    return std::make_pair(cast_or_null<VarDecl>(ConditionVar),
                          Condition.get());
  }
  llvm::Optional<bool> getKnownValue() const {
    if (!HasKnownValue)
      return None;
    return KnownValue;
  }
};
static ConditionResult ConditionError() { return ConditionResult(true); }

enum class ConditionKind {
  Boolean,     ///< A boolean condition, from 'if', 'while', 'for', or 'do'.
  ConstexprIf, ///< A constant boolean condition from 'if constexpr'.
  Switch       ///< An integral condition for a 'switch' statement.
};

ConditionResult ActOnCondition(Scope *S, SourceLocation Loc,
                               Expr *SubExpr, ConditionKind CK);

ConditionResult ActOnConditionVariable(Decl *ConditionVar,
                                       SourceLocation StmtLoc,
                                       ConditionKind CK);

DeclResult ActOnCXXConditionDeclaration(Scope *S, Declarator &D);

ExprResult CheckConditionVariable(VarDecl *ConditionVar,
                                  SourceLocation StmtLoc,
                                  ConditionKind CK);
ExprResult CheckSwitchCondition(SourceLocation SwitchLoc, Expr *Cond);

/// CheckBooleanCondition - Diagnose problems involving the use of
/// the given expression as a boolean condition (e.g. in an if
/// statement).  Also performs the standard function and array
/// decays, possibly changing the input variable.
///
/// \param Loc - A location associated with the condition, e.g. the
/// 'if' keyword.
/// \return true iff there were any errors
ExprResult CheckBooleanCondition(SourceLocation Loc, Expr *E,
                                 bool IsConstexpr = false);

/// DiagnoseAssignmentAsCondition - Given that an expression is
/// being used as a boolean condition, warn if it's an assignment.
void DiagnoseAssignmentAsCondition(Expr *E);

/// \brief Redundant parentheses over an equality comparison can indicate
/// that the user intended an assignment used as condition.
void DiagnoseEqualityWithExtraParens(ParenExpr *ParenE);

/// CheckCXXBooleanCondition - Returns true if conversion to bool is invalid.
ExprResult CheckCXXBooleanCondition(Expr *CondExpr, bool IsConstexpr = false);

/// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have
/// the specified width and sign.  If an overflow occurs, detect it and emit
/// the specified diagnostic.
void ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &OldVal,
                                        unsigned NewWidth, bool NewSign,
                                        SourceLocation Loc, unsigned DiagID);

/// Checks that the Objective-C declaration is declared in the global scope.
/// Emits an error and marks the declaration as invalid if it's not declared
/// in the global scope.
bool CheckObjCDeclScope(Decl *D);

/// \brief Abstract base class used for diagnosing integer constant
/// expression violations.
class VerifyICEDiagnoser {
public:
  bool Suppress;

  VerifyICEDiagnoser(bool Suppress = false) : Suppress(Suppress) { }

  virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) =0;
  virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR);
  virtual ~VerifyICEDiagnoser() { }
};

/// VerifyIntegerConstantExpression - Verifies that an expression is an ICE,
/// and reports the appropriate diagnostics. Returns false on success.
/// Can optionally return the value of the expression.
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           VerifyICEDiagnoser &Diagnoser,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
                                           unsigned DiagID,
                                           bool AllowFold = true);
ExprResult VerifyIntegerConstantExpression(Expr *E,
                                           llvm::APSInt *Result = nullptr);

/// VerifyBitField - verifies that a bit field expression is an ICE and has
/// the correct width, and that the field type is valid.
/// Returns false on success.
/// Can optionally return whether the bit-field is of width 0
ExprResult VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
                          QualType FieldTy, bool IsMsStruct,
                          Expr *BitWidth, bool *ZeroWidth = nullptr);

9874private:
unsigned ForceCUDAHostDeviceDepth = 0;

9877public:
/// Increments our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  So long as this count is greater
/// than zero, all functions encountered will be __host__ __device__.
void PushForceCUDAHostDevice();

/// Decrements our count of the number of times we've seen a pragma forcing
/// functions to be __host__ __device__.  Returns false if the count is 0
/// before incrementing, so you can emit an error.
bool PopForceCUDAHostDevice();

/// Diagnostics that are emitted only if we discover that the given function
/// must be codegen'ed.  Because handling these correctly adds overhead to
/// compilation, this is currently only enabled for CUDA compilations.
llvm::DenseMap<CanonicalDeclPtr<FunctionDecl>,
               std::vector<PartialDiagnosticAt>>
    CUDADeferredDiags;

/// A pair of a canonical FunctionDecl and a SourceLocation.  When used as the
/// key in a hashtable, both the FD and location are hashed.
struct FunctionDeclAndLoc {
  CanonicalDeclPtr<FunctionDecl> FD;
  SourceLocation Loc;
};

/// FunctionDecls and SourceLocations for which CheckCUDACall has emitted a
/// (maybe deferred) "bad call" diagnostic.  We use this to avoid emitting the
/// same deferred diag twice.
llvm::DenseSet<FunctionDeclAndLoc> LocsWithCUDACallDiags;

/// An inverse call graph, mapping known-emitted functions to one of their
/// known-emitted callers (plus the location of the call).
///
/// Functions that we can tell a priori must be emitted aren't added to this
/// map.
llvm::DenseMap</* Callee = */ CanonicalDeclPtr<FunctionDecl>,
               /* Caller = */ FunctionDeclAndLoc>
    CUDAKnownEmittedFns;

/// A partial call graph maintained during CUDA compilation to support
/// deferred diagnostics.
///
/// Functions are only added here if, at the time they're considered, they are
/// not known-emitted.  As soon as we discover that a function is
/// known-emitted, we remove it and everything it transitively calls from this
/// set and add those functions to CUDAKnownEmittedFns.
llvm::DenseMap</* Caller = */ CanonicalDeclPtr<FunctionDecl>,
               /* Callees = */ llvm::MapVector<CanonicalDeclPtr<FunctionDecl>,
                                               SourceLocation>>
    CUDACallGraph;

/// Diagnostic builder for CUDA errors which may or may not be deferred.
///
/// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
/// which are not allowed to appear inside __device__ functions and are
/// allowed to appear in __host__ __device__ functions only if the host+device
/// function is never codegen'ed.
///
/// To handle this, we use the notion of "deferred diagnostics", where we
/// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
///
/// This class lets you emit either a regular diagnostic, a deferred
/// diagnostic, or no diagnostic at all, according to an argument you pass to
/// its constructor, thus simplifying the process of creating these "maybe
/// deferred" diagnostics.
class CUDADiagBuilder {
public:
  enum Kind {
    /// Emit no diagnostics.
    K_Nop,
    /// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
    K_Immediate,
    /// Emit the diagnostic immediately, and, if it's a warning or error, also
    /// emit a call stack showing how this function can be reached by an a
    /// priori known-emitted function.
    K_ImmediateWithCallStack,
    /// Create a deferred diagnostic, which is emitted only if the function
    /// it's attached to is codegen'ed.  Also emit a call stack as with
    /// K_ImmediateWithCallStack.
    K_Deferred
  };

  CUDADiagBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
                  FunctionDecl *Fn, Sema &S);
  ~CUDADiagBuilder();

  /// Convertible to bool: True if we immediately emitted an error, false if
  /// we didn't emit an error or we created a deferred error.
  ///
  /// Example usage:
  ///
  ///   if (CUDADiagBuilder(...) << foo << bar)
  ///     return ExprError();
  ///
  /// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
  /// want to use these instead of creating a CUDADiagBuilder yourself.
  operator bool() const { return ImmediateDiag.hasValue(); }

  template <typename T>
  friend const CUDADiagBuilder &operator<<(const CUDADiagBuilder &Diag,
                                           const T &Value) {
    if (Diag.ImmediateDiag.hasValue())
5
←
Assuming the condition is false→
6
←
Taking false branch→
      *Diag.ImmediateDiag << Value;
    else if (Diag.PartialDiag.hasValue())
7
←
Assuming the condition is true→
8
←
Taking true branch→
      *Diag.PartialDiag << Value;
9
←
Calling 'operator<<'→
20
←
Returned allocated memory→
    return Diag;
  }

private:
  Sema &S;
  SourceLocation Loc;
  unsigned DiagID;
  FunctionDecl *Fn;
  bool ShowCallStack;

  // Invariant: At most one of these Optionals has a value.
  // FIXME: Switch these to a Variant once that exists.
  llvm::Optional<SemaDiagnosticBuilder> ImmediateDiag;
  llvm::Optional<PartialDiagnostic> PartialDiag;
};

/// Creates a CUDADiagBuilder that emits the diagnostic if the current context
/// is "used as device code".
///
/// - If CurContext is a __host__ function, does not emit any diagnostics.
/// - If CurContext is a __device__ or __global__ function, emits the
///   diagnostics immediately.
/// - If CurContext is a __host__ __device__ function and we are compiling for
///   the device, creates a diagnostic which is emitted if and when we realize
///   that the function will be codegen'ed.
///
/// Example usage:
///
///  // Variable-length arrays are not allowed in CUDA device code.
///  if (CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget())
///    return ExprError();
///  // Otherwise, continue parsing as normal.
CUDADiagBuilder CUDADiagIfDeviceCode(SourceLocation Loc, unsigned DiagID);

/// Creates a CUDADiagBuilder that emits the diagnostic if the current context
/// is "used as host code".
///
/// Same as CUDADiagIfDeviceCode, with "host" and "device" switched.
CUDADiagBuilder CUDADiagIfHostCode(SourceLocation Loc, unsigned DiagID);

enum CUDAFunctionTarget {
  CFT_Device,
  CFT_Global,
  CFT_Host,
  CFT_HostDevice,
  CFT_InvalidTarget
};

/// Determines whether the given function is a CUDA device/host/kernel/etc.
/// function.
///
/// Use this rather than examining the function's attributes yourself -- you
/// will get it wrong.  Returns CFT_Host if D is null.
CUDAFunctionTarget IdentifyCUDATarget(const FunctionDecl *D,
                                      bool IgnoreImplicitHDAttr = false);
CUDAFunctionTarget IdentifyCUDATarget(const AttributeList *Attr);

/// Gets the CUDA target for the current context.
CUDAFunctionTarget CurrentCUDATarget() {
  return IdentifyCUDATarget(dyn_cast<FunctionDecl>(CurContext));
}

// CUDA function call preference. Must be ordered numerically from
// worst to best.
enum CUDAFunctionPreference {
  CFP_Never,      // Invalid caller/callee combination.
  CFP_WrongSide,  // Calls from host-device to host or device
                  // function that do not match current compilation
                  // mode.
  CFP_HostDevice, // Any calls to host/device functions.
  CFP_SameSide,   // Calls from host-device to host or device
                  // function matching current compilation mode.
  CFP_Native,     // host-to-host or device-to-device calls.
};

/// Identifies relative preference of a given Caller/Callee
/// combination, based on their host/device attributes.
/// \param Caller function which needs address of \p Callee.
///               nullptr in case of global context.
/// \param Callee target function
///
/// \returns preference value for particular Caller/Callee combination.
CUDAFunctionPreference IdentifyCUDAPreference(const FunctionDecl *Caller,
                                              const FunctionDecl *Callee);

/// Determines whether Caller may invoke Callee, based on their CUDA
/// host/device attributes.  Returns false if the call is not allowed.
///
/// Note: Will return true for CFP_WrongSide calls.  These may appear in
/// semantically correct CUDA programs, but only if they're never codegen'ed.
bool IsAllowedCUDACall(const FunctionDecl *Caller,
                       const FunctionDecl *Callee) {
  return IdentifyCUDAPreference(Caller, Callee) != CFP_Never;
}

/// May add implicit CUDAHostAttr and CUDADeviceAttr attributes to FD,
/// depending on FD and the current compilation settings.
void maybeAddCUDAHostDeviceAttrs(FunctionDecl *FD,
                                 const LookupResult &Previous);

10082public:
/// Check whether we're allowed to call Callee from the current context.
///
/// - If the call is never allowed in a semantically-correct program
///   (CFP_Never), emits an error and returns false.
///
/// - If the call is allowed in semantically-correct programs, but only if
///   it's never codegen'ed (CFP_WrongSide), creates a deferred diagnostic to
///   be emitted if and when the caller is codegen'ed, and returns true.
///
///   Will only create deferred diagnostics for a given SourceLocation once,
///   so you can safely call this multiple times without generating duplicate
///   deferred errors.
///
/// - Otherwise, returns true without emitting any diagnostics.
bool CheckCUDACall(SourceLocation Loc, FunctionDecl *Callee);

/// Set __device__ or __host__ __device__ attributes on the given lambda
/// operator() method.
///
/// CUDA lambdas declared inside __device__ or __global__ functions inherit
/// the __device__ attribute.  Similarly, lambdas inside __host__ __device__
/// functions become __host__ __device__ themselves.
void CUDASetLambdaAttrs(CXXMethodDecl *Method);

/// Finds a function in \p Matches with highest calling priority
/// from \p Caller context and erases all functions with lower
/// calling priority.
void EraseUnwantedCUDAMatches(
    const FunctionDecl *Caller,
    SmallVectorImpl<std::pair<DeclAccessPair, FunctionDecl *>> &Matches);

/// Given a implicit special member, infer its CUDA target from the
/// calls it needs to make to underlying base/field special members.
/// \param ClassDecl the class for which the member is being created.
/// \param CSM the kind of special member.
/// \param MemberDecl the special member itself.
/// \param ConstRHS true if this is a copy operation with a const object on
///        its RHS.
/// \param Diagnose true if this call should emit diagnostics.
/// \return true if there was an error inferring.
/// The result of this call is implicit CUDA target attribute(s) attached to
/// the member declaration.
bool inferCUDATargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl,
                                             CXXSpecialMember CSM,
                                             CXXMethodDecl *MemberDecl,
                                             bool ConstRHS,
                                             bool Diagnose);

/// \return true if \p CD can be considered empty according to CUDA
/// (E.2.3.1 in CUDA 7.5 Programming guide).
bool isEmptyCudaConstructor(SourceLocation Loc, CXXConstructorDecl *CD);
bool isEmptyCudaDestructor(SourceLocation Loc, CXXDestructorDecl *CD);

/// Check whether NewFD is a valid overload for CUDA. Emits
/// diagnostics and invalidates NewFD if not.
void checkCUDATargetOverload(FunctionDecl *NewFD,
                             const LookupResult &Previous);
/// Copies target attributes from the template TD to the function FD.
void inheritCUDATargetAttrs(FunctionDecl *FD, const FunctionTemplateDecl &TD);

/// \name Code completion
//@{
/// \brief Describes the context in which code completion occurs.
enum ParserCompletionContext {
  /// \brief Code completion occurs at top-level or namespace context.
  PCC_Namespace,
  /// \brief Code completion occurs within a class, struct, or union.
  PCC_Class,
  /// \brief Code completion occurs within an Objective-C interface, protocol,
  /// or category.
  PCC_ObjCInterface,
  /// \brief Code completion occurs within an Objective-C implementation or
  /// category implementation
  PCC_ObjCImplementation,
  /// \brief Code completion occurs within the list of instance variables
  /// in an Objective-C interface, protocol, category, or implementation.
  PCC_ObjCInstanceVariableList,
  /// \brief Code completion occurs following one or more template
  /// headers.
  PCC_Template,
  /// \brief Code completion occurs following one or more template
  /// headers within a class.
  PCC_MemberTemplate,
  /// \brief Code completion occurs within an expression.
  PCC_Expression,
  /// \brief Code completion occurs within a statement, which may
  /// also be an expression or a declaration.
  PCC_Statement,
  /// \brief Code completion occurs at the beginning of the
  /// initialization statement (or expression) in a for loop.
  PCC_ForInit,
  /// \brief Code completion occurs within the condition of an if,
  /// while, switch, or for statement.
  PCC_Condition,
  /// \brief Code completion occurs within the body of a function on a
  /// recovery path, where we do not have a specific handle on our position
  /// in the grammar.
  PCC_RecoveryInFunction,
  /// \brief Code completion occurs where only a type is permitted.
  PCC_Type,
  /// \brief Code completion occurs in a parenthesized expression, which
  /// might also be a type cast.
  PCC_ParenthesizedExpression,
  /// \brief Code completion occurs within a sequence of declaration
  /// specifiers within a function, method, or block.
  PCC_LocalDeclarationSpecifiers
};

void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path);
void CodeCompleteOrdinaryName(Scope *S,
                              ParserCompletionContext CompletionContext);
void CodeCompleteDeclSpec(Scope *S, DeclSpec &DS,
                          bool AllowNonIdentifiers,
                          bool AllowNestedNameSpecifiers);

struct CodeCompleteExpressionData;
void CodeCompleteExpression(Scope *S,
                            const CodeCompleteExpressionData &Data);
void CodeCompleteMemberReferenceExpr(Scope *S, Expr *Base,
                                     SourceLocation OpLoc, bool IsArrow,
                                     bool IsBaseExprStatement);
void CodeCompletePostfixExpression(Scope *S, ExprResult LHS);
void CodeCompleteTag(Scope *S, unsigned TagSpec);
void CodeCompleteTypeQualifiers(DeclSpec &DS);
void CodeCompleteFunctionQualifiers(DeclSpec &DS, Declarator &D,
                                    const VirtSpecifiers *VS = nullptr);
void CodeCompleteBracketDeclarator(Scope *S);
void CodeCompleteCase(Scope *S);
void CodeCompleteCall(Scope *S, Expr *Fn, ArrayRef<Expr *> Args);
void CodeCompleteConstructor(Scope *S, QualType Type, SourceLocation Loc,
                             ArrayRef<Expr *> Args);
void CodeCompleteInitializer(Scope *S, Decl *D);
void CodeCompleteReturn(Scope *S);
void CodeCompleteAfterIf(Scope *S);
void CodeCompleteAssignmentRHS(Scope *S, Expr *LHS);

void CodeCompleteQualifiedId(Scope *S, CXXScopeSpec &SS,
                             bool EnteringContext);
void CodeCompleteUsing(Scope *S);
void CodeCompleteUsingDirective(Scope *S);
void CodeCompleteNamespaceDecl(Scope *S);
void CodeCompleteNamespaceAliasDecl(Scope *S);
void CodeCompleteOperatorName(Scope *S);
void CodeCompleteConstructorInitializer(
                              Decl *Constructor,
                              ArrayRef<CXXCtorInitializer *> Initializers);

void CodeCompleteLambdaIntroducer(Scope *S, LambdaIntroducer &Intro,
                                  bool AfterAmpersand);

void CodeCompleteObjCAtDirective(Scope *S);
void CodeCompleteObjCAtVisibility(Scope *S);
void CodeCompleteObjCAtStatement(Scope *S);
void CodeCompleteObjCAtExpression(Scope *S);
void CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS);
void CodeCompleteObjCPropertyGetter(Scope *S);
void CodeCompleteObjCPropertySetter(Scope *S);
void CodeCompleteObjCPassingType(Scope *S, ObjCDeclSpec &DS,
                                 bool IsParameter);
void CodeCompleteObjCMessageReceiver(Scope *S);
void CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression);
void CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
                                  ArrayRef<IdentifierInfo *> SelIdents,
                                  bool AtArgumentExpression,
                                  bool IsSuper = false);
void CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
                                     ArrayRef<IdentifierInfo *> SelIdents,
                                     bool AtArgumentExpression,
                                     ObjCInterfaceDecl *Super = nullptr);
void CodeCompleteObjCForCollection(Scope *S,
                                   DeclGroupPtrTy IterationVar);
void CodeCompleteObjCSelector(Scope *S,
                              ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCProtocolReferences(
                                       ArrayRef<IdentifierLocPair> Protocols);
void CodeCompleteObjCProtocolDecl(Scope *S);
void CodeCompleteObjCInterfaceDecl(Scope *S);
void CodeCompleteObjCSuperclass(Scope *S,
                                IdentifierInfo *ClassName,
                                SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationDecl(Scope *S);
void CodeCompleteObjCInterfaceCategory(Scope *S,
                                       IdentifierInfo *ClassName,
                                       SourceLocation ClassNameLoc);
void CodeCompleteObjCImplementationCategory(Scope *S,
                                            IdentifierInfo *ClassName,
                                            SourceLocation ClassNameLoc);
void CodeCompleteObjCPropertyDefinition(Scope *S);
void CodeCompleteObjCPropertySynthesizeIvar(Scope *S,
                                            IdentifierInfo *PropertyName);
void CodeCompleteObjCMethodDecl(Scope *S, Optional<bool> IsInstanceMethod,
                                ParsedType ReturnType);
void CodeCompleteObjCMethodDeclSelector(Scope *S,
                                        bool IsInstanceMethod,
                                        bool AtParameterName,
                                        ParsedType ReturnType,
                                        ArrayRef<IdentifierInfo *> SelIdents);
void CodeCompleteObjCClassPropertyRefExpr(Scope *S, IdentifierInfo &ClassName,
                                          SourceLocation ClassNameLoc,
                                          bool IsBaseExprStatement);
void CodeCompletePreprocessorDirective(bool InConditional);
void CodeCompleteInPreprocessorConditionalExclusion(Scope *S);
void CodeCompletePreprocessorMacroName(bool IsDefinition);
void CodeCompletePreprocessorExpression();
void CodeCompletePreprocessorMacroArgument(Scope *S,
                                           IdentifierInfo *Macro,
                                           MacroInfo *MacroInfo,
                                           unsigned Argument);
void CodeCompleteNaturalLanguage();
void CodeCompleteAvailabilityPlatformName();
void GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
                                 CodeCompletionTUInfo &CCTUInfo,
                SmallVectorImpl<CodeCompletionResult> &Results);
//@}

//===--------------------------------------------------------------------===//
// Extra semantic analysis beyond the C type system

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

10307private:
void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
                      const ArraySubscriptExpr *ASE=nullptr,
                      bool AllowOnePastEnd=true, bool IndexNegated=false);
void CheckArrayAccess(const Expr *E);
// Used to grab the relevant information from a FormatAttr and a
// FunctionDeclaration.
struct FormatStringInfo {
  unsigned FormatIdx;
  unsigned FirstDataArg;
  bool HasVAListArg;
};

static bool getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
                                FormatStringInfo *FSI);
bool CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
                       const FunctionProtoType *Proto);
bool CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation loc,
                         ArrayRef<const Expr *> Args);
bool CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
                      const FunctionProtoType *Proto);
bool CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto);
void CheckConstructorCall(FunctionDecl *FDecl,
                          ArrayRef<const Expr *> Args,
                          const FunctionProtoType *Proto,
                          SourceLocation Loc);

void checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
               const Expr *ThisArg, ArrayRef<const Expr *> Args,
               bool IsMemberFunction, SourceLocation Loc, SourceRange Range,
               VariadicCallType CallType);

bool CheckObjCString(Expr *Arg);
ExprResult CheckOSLogFormatStringArg(Expr *Arg);

ExprResult CheckBuiltinFunctionCall(FunctionDecl *FDecl,
                                    unsigned BuiltinID, CallExpr *TheCall);

bool CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
                                  unsigned MaxWidth);
bool CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool CheckAArch64BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckSystemZBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinGatherScatterScale(unsigned BuiltinID, CallExpr *TheCall);
bool CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
bool CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);

bool SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall);
bool SemaBuiltinVAStartARMMicrosoft(CallExpr *Call);
bool SemaBuiltinUnorderedCompare(CallExpr *TheCall);
bool SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs);
bool SemaBuiltinVSX(CallExpr *TheCall);
bool SemaBuiltinOSLogFormat(CallExpr *TheCall);

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

10372private:
bool SemaBuiltinPrefetch(CallExpr *TheCall);
bool SemaBuiltinAllocaWithAlign(CallExpr *TheCall);
bool SemaBuiltinAssume(CallExpr *TheCall);
bool SemaBuiltinAssumeAligned(CallExpr *TheCall);
bool SemaBuiltinLongjmp(CallExpr *TheCall);
bool SemaBuiltinSetjmp(CallExpr *TheCall);
ExprResult SemaBuiltinAtomicOverloaded(ExprResult TheCallResult);
ExprResult SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult);
ExprResult SemaAtomicOpsOverloaded(ExprResult TheCallResult,
                                   AtomicExpr::AtomicOp Op);
bool SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
                            llvm::APSInt &Result);
bool SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
                                 int Low, int High);
bool SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
                                    unsigned Multiple);
bool SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
                              int ArgNum, unsigned ExpectedFieldNum,
                              bool AllowName);
10392public:
enum FormatStringType {
  FST_Scanf,
  FST_Printf,
  FST_NSString,
  FST_Strftime,
  FST_Strfmon,
  FST_Kprintf,
  FST_FreeBSDKPrintf,
  FST_OSTrace,
  FST_OSLog,
  FST_Unknown
};
static FormatStringType GetFormatStringType(const FormatAttr *Format);

bool FormatStringHasSArg(const StringLiteral *FExpr);

static bool GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx);

10411private:
bool CheckFormatArguments(const FormatAttr *Format,
                          ArrayRef<const Expr *> Args,
                          bool IsCXXMember,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange Range,
                          llvm::SmallBitVector &CheckedVarArgs);
bool CheckFormatArguments(ArrayRef<const Expr *> Args,
                          bool HasVAListArg, unsigned format_idx,
                          unsigned firstDataArg, FormatStringType Type,
                          VariadicCallType CallType,
                          SourceLocation Loc, SourceRange range,
                          llvm::SmallBitVector &CheckedVarArgs);

void CheckAbsoluteValueFunction(const CallExpr *Call,
                                const FunctionDecl *FDecl);

void CheckMaxUnsignedZero(const CallExpr *Call, const FunctionDecl *FDecl);

void CheckMemaccessArguments(const CallExpr *Call,
                             unsigned BId,
                             IdentifierInfo *FnName);

void CheckStrlcpycatArguments(const CallExpr *Call,
                              IdentifierInfo *FnName);

void CheckStrncatArguments(const CallExpr *Call,
                           IdentifierInfo *FnName);

void CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
                        SourceLocation ReturnLoc,
                        bool isObjCMethod = false,
                        const AttrVec *Attrs = nullptr,
                        const FunctionDecl *FD = nullptr);

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

10449private:
void CheckImplicitConversions(Expr *E, SourceLocation CC = SourceLocation());
void CheckBoolLikeConversion(Expr *E, SourceLocation CC);
void CheckForIntOverflow(Expr *E);
void CheckUnsequencedOperations(Expr *E);

/// \brief Perform semantic checks on a completed expression. This will either
/// be a full-expression or a default argument expression.
void CheckCompletedExpr(Expr *E, SourceLocation CheckLoc = SourceLocation(),
                        bool IsConstexpr = false);

void CheckBitFieldInitialization(SourceLocation InitLoc, FieldDecl *Field,
                                 Expr *Init);

/// Check if there is a field shadowing.
void CheckShadowInheritedFields(const SourceLocation &Loc,
                                DeclarationName FieldName,
                                const CXXRecordDecl *RD);

/// \brief Check if the given expression contains 'break' or 'continue'
/// statement that produces control flow different from GCC.
void CheckBreakContinueBinding(Expr *E);

/// \brief Check whether receiver is mutable ObjC container which
/// attempts to add itself into the container
void CheckObjCCircularContainer(ObjCMessageExpr *Message);

void AnalyzeDeleteExprMismatch(const CXXDeleteExpr *DE);
void AnalyzeDeleteExprMismatch(FieldDecl *Field, SourceLocation DeleteLoc,
                               bool DeleteWasArrayForm);
10479public:
/// \brief Register a magic integral constant to be used as a type tag.
void RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
                                uint64_t MagicValue, QualType Type,
                                bool LayoutCompatible, bool MustBeNull);

struct TypeTagData {
  TypeTagData() {}

  TypeTagData(QualType Type, bool LayoutCompatible, bool MustBeNull) :
      Type(Type), LayoutCompatible(LayoutCompatible),
      MustBeNull(MustBeNull)
  {}

  QualType Type;

  /// If true, \c Type should be compared with other expression's types for
  /// layout-compatibility.
  unsigned LayoutCompatible : 1;
  unsigned MustBeNull : 1;
};

/// A pair of ArgumentKind identifier and magic value.  This uniquely
/// identifies the magic value.
typedef std::pair<const IdentifierInfo *, uint64_t> TypeTagMagicValue;

10505private:
/// \brief A map from magic value to type information.
std::unique_ptr<llvm::DenseMap<TypeTagMagicValue, TypeTagData>>
    TypeTagForDatatypeMagicValues;

/// \brief Peform checks on a call of a function with argument_with_type_tag
/// or pointer_with_type_tag attributes.
void CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
                              const ArrayRef<const Expr *> ExprArgs,
                              SourceLocation CallSiteLoc);

/// \brief Check if we are taking the address of a packed field
/// as this may be a problem if the pointer value is dereferenced.
void CheckAddressOfPackedMember(Expr *rhs);

/// \brief The parser's current scope.
///
/// The parser maintains this state here.
Scope *CurScope;

mutable IdentifierInfo *Ident_super;
mutable IdentifierInfo *Ident___float128;

/// Nullability type specifiers.
IdentifierInfo *Ident__Nonnull = nullptr;
IdentifierInfo *Ident__Nullable = nullptr;
IdentifierInfo *Ident__Null_unspecified = nullptr;

IdentifierInfo *Ident_NSError = nullptr;

/// \brief The handler for the FileChanged preprocessor events.
///
/// Used for diagnostics that implement custom semantic analysis for #include
/// directives, like -Wpragma-pack.
sema::SemaPPCallbacks *SemaPPCallbackHandler;

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

10548public:
/// Retrieve the keyword associated
IdentifierInfo *getNullabilityKeyword(NullabilityKind nullability);

/// The struct behind the CFErrorRef pointer.
RecordDecl *CFError = nullptr;

/// Retrieve the identifier "NSError".
IdentifierInfo *getNSErrorIdent();

/// \brief Retrieve the parser's current scope.
///
/// This routine must only be used when it is certain that semantic analysis
/// and the parser are in precisely the same context, which is not the case
/// when, e.g., we are performing any kind of template instantiation.
/// Therefore, the only safe places to use this scope are in the parser
/// itself and in routines directly invoked from the parser and *never* from
/// template substitution or instantiation.
Scope *getCurScope() const { return CurScope; }

void incrementMSManglingNumber() const {
  return CurScope->incrementMSManglingNumber();
}

IdentifierInfo *getSuperIdentifier() const;
IdentifierInfo *getFloat128Identifier() const;

Decl *getObjCDeclContext() const;

DeclContext *getCurLexicalContext() const {
  return OriginalLexicalContext ? OriginalLexicalContext : CurContext;
}

const DeclContext *getCurObjCLexicalContext() const {
  const DeclContext *DC = getCurLexicalContext();
  // A category implicitly has the attribute of the interface.
  if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(DC))
    DC = CatD->getClassInterface();
  return DC;
}

/// \brief To be used for checking whether the arguments being passed to
/// function exceeds the number of parameters expected for it.
static bool TooManyArguments(size_t NumParams, size_t NumArgs,
                             bool PartialOverloading = false) {
  // We check whether we're just after a comma in code-completion.
  if (NumArgs > 0 && PartialOverloading)
    return NumArgs + 1 > NumParams; // If so, we view as an extra argument.
  return NumArgs > NumParams;
}

// Emitting members of dllexported classes is delayed until the class
// (including field initializers) is fully parsed.
SmallVector<CXXRecordDecl*, 4> DelayedDllExportClasses;

10603private:
class SavePendingParsedClassStateRAII {
public:
  SavePendingParsedClassStateRAII(Sema &S) : S(S) { swapSavedState(); }

  ~SavePendingParsedClassStateRAII() {
    assert(S.DelayedExceptionSpecChecks.empty() &&(static_cast <bool> (S.DelayedExceptionSpecChecks.empty
() && "there shouldn't be any pending delayed exception spec checks"
) ? void (0) : __assert_fail ("S.DelayedExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10610, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed exception spec checks")(static_cast <bool> (S.DelayedExceptionSpecChecks.empty
() && "there shouldn't be any pending delayed exception spec checks"
) ? void (0) : __assert_fail ("S.DelayedExceptionSpecChecks.empty() && \"there shouldn't be any pending delayed exception spec checks\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10610, __extension__ __PRETTY_FUNCTION__));
    assert(S.DelayedDefaultedMemberExceptionSpecs.empty() &&(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10613, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed defaulted member "(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10613, __extension__ __PRETTY_FUNCTION__))
           "exception specs")(static_cast <bool> (S.DelayedDefaultedMemberExceptionSpecs
.empty() && "there shouldn't be any pending delayed defaulted member "
 "exception specs") ? void (0) : __assert_fail ("S.DelayedDefaultedMemberExceptionSpecs.empty() && \"there shouldn't be any pending delayed defaulted member \" \"exception specs\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10613, __extension__ __PRETTY_FUNCTION__));
    assert(S.DelayedDllExportClasses.empty() &&(static_cast <bool> (S.DelayedDllExportClasses.empty() &&
 "there shouldn't be any pending delayed DLL export classes")
 ? void (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10615, __extension__ __PRETTY_FUNCTION__))
           "there shouldn't be any pending delayed DLL export classes")(static_cast <bool> (S.DelayedDllExportClasses.empty() &&
 "there shouldn't be any pending delayed DLL export classes")
 ? void (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"there shouldn't be any pending delayed DLL export classes\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Sema/Sema.h"
, 10615, __extension__ __PRETTY_FUNCTION__));
    swapSavedState();
  }

private:
  Sema &S;
  decltype(DelayedExceptionSpecChecks) SavedExceptionSpecChecks;
  decltype(DelayedDefaultedMemberExceptionSpecs)
      SavedDefaultedMemberExceptionSpecs;
  decltype(DelayedDllExportClasses) SavedDllExportClasses;

  void swapSavedState() {
    SavedExceptionSpecChecks.swap(S.DelayedExceptionSpecChecks);
    SavedDefaultedMemberExceptionSpecs.swap(
        S.DelayedDefaultedMemberExceptionSpecs);
    SavedDllExportClasses.swap(S.DelayedDllExportClasses);
  }
};

/// \brief Helper class that collects misaligned member designations and
/// their location info for delayed diagnostics.
struct MisalignedMember {
  Expr *E;
  RecordDecl *RD;
  ValueDecl *MD;
  CharUnits Alignment;

  MisalignedMember() : E(), RD(), MD(), Alignment() {}
  MisalignedMember(Expr *E, RecordDecl *RD, ValueDecl *MD,
                   CharUnits Alignment)
      : E(E), RD(RD), MD(MD), Alignment(Alignment) {}
  explicit MisalignedMember(Expr *E)
      : MisalignedMember(E, nullptr, nullptr, CharUnits()) {}

  bool operator==(const MisalignedMember &m) { return this->E == m.E; }
};
/// \brief Small set of gathered accesses to potentially misaligned members
/// due to the packed attribute.
SmallVector<MisalignedMember, 4> MisalignedMembers;

/// \brief Adds an expression to the set of gathered misaligned members.
void AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
                                   CharUnits Alignment);

10659public:
/// \brief Diagnoses the current set of gathered accesses. This typically
/// happens at full expression level. The set is cleared after emitting the
/// diagnostics.
void DiagnoseMisalignedMembers();

/// \brief This function checks if the expression is in the sef of potentially
/// misaligned members and it is converted to some pointer type T with lower
/// or equal alignment requirements. If so it removes it. This is used when
/// we do not want to diagnose such misaligned access (e.g. in conversions to
/// void*).
void DiscardMisalignedMemberAddress(const Type *T, Expr *E);

/// \brief This function calls Action when it determines that E designates a
/// misaligned member due to the packed attribute. This is used to emit
/// local diagnostics like in reference binding.
void RefersToMemberWithReducedAlignment(
    Expr *E,
    llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
        Action);
10679};

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

10686public:

EnterExpressionEvaluationContext(Sema &Actions,
                                 Sema::ExpressionEvaluationContext NewContext,
                                 Decl *LambdaContextDecl = nullptr,
                                 bool IsDecltype = false,
                                 bool ShouldEnter = true)
    : Actions(Actions), Entered(ShouldEnter) {
  if (Entered)
    Actions.PushExpressionEvaluationContext(NewContext, LambdaContextDecl,
                                            IsDecltype);
}
EnterExpressionEvaluationContext(Sema &Actions,
                                 Sema::ExpressionEvaluationContext NewContext,
                                 Sema::ReuseLambdaContextDecl_t,
                                 bool IsDecltype = false)
  : Actions(Actions) {
  Actions.PushExpressionEvaluationContext(NewContext,
                                          Sema::ReuseLambdaContextDecl,
                                          IsDecltype);
}

enum InitListTag { InitList };
EnterExpressionEvaluationContext(Sema &Actions, InitListTag,
                                 bool ShouldEnter = true)
    : Actions(Actions), Entered(false) {
  // In C++11 onwards, narrowing checks are performed on the contents of
  // braced-init-lists, even when they occur within unevaluated operands.
  // Therefore we still need to instantiate constexpr functions used in such
  // a context.
  if (ShouldEnter && Actions.isUnevaluatedContext() &&
      Actions.getLangOpts().CPlusPlus11) {
    Actions.PushExpressionEvaluationContext(
        Sema::ExpressionEvaluationContext::UnevaluatedList, nullptr, false);
    Entered = true;
  }
}

~EnterExpressionEvaluationContext() {
  if (Entered)
    Actions.PopExpressionEvaluationContext();
}
10728};

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

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

10742} // end namespace clang

10744namespace llvm {
10745// Hash a FunctionDeclAndLoc by looking at both its FunctionDecl and its
10746// SourceLocation.
10747template <> struct DenseMapInfo<clang::Sema::FunctionDeclAndLoc> {
using FunctionDeclAndLoc = clang::Sema::FunctionDeclAndLoc;
using FDBaseInfo = DenseMapInfo<clang::CanonicalDeclPtr<clang::FunctionDecl>>;

static FunctionDeclAndLoc getEmptyKey() {
  return {FDBaseInfo::getEmptyKey(), clang::SourceLocation()};
}

static FunctionDeclAndLoc getTombstoneKey() {
  return {FDBaseInfo::getTombstoneKey(), clang::SourceLocation()};
}

static unsigned getHashValue(const FunctionDeclAndLoc &FDL) {
  return hash_combine(FDBaseInfo::getHashValue(FDL.FD),
                      FDL.Loc.getRawEncoding());
}

static bool isEqual(const FunctionDeclAndLoc &LHS,
                    const FunctionDeclAndLoc &RHS) {
  return LHS.FD == RHS.FD && LHS.Loc == RHS.Loc;
}
10768};
10769} // namespace llvm

10771#endif

←

/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h

1//===- PartialDiagnostic.h - Diagnostic "closures" --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10/// \file
11/// \brief Implements a partial diagnostic that can be emitted anwyhere
12/// in a DiagnosticBuilder stream.
13//
14//===----------------------------------------------------------------------===//

16#ifndef LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H
17#define LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H

19#include "clang/Basic/Diagnostic.h"
20#include "clang/Basic/LLVM.h"
21#include "clang/Basic/SourceLocation.h"
22#include "llvm/ADT/SmallVector.h"
23#include "llvm/ADT/StringRef.h"
24#include <cassert>
25#include <cstdint>
26#include <string>
27#include <type_traits>
28#include <utility>

30namespace clang {

32class DeclContext;
33class IdentifierInfo;

35class PartialDiagnostic {
36public:
enum {
    // The MaxArguments and MaxFixItHints member enum values from
    // DiagnosticsEngine are private but DiagnosticsEngine declares
    // PartialDiagnostic a friend.  These enum values are redeclared
    // here so that the nested Storage class below can access them.
    MaxArguments = DiagnosticsEngine::MaxArguments
};

struct Storage {
  enum {
      /// \brief The maximum number of arguments we can hold. We
      /// currently only support up to 10 arguments (%0-%9).
      ///
      /// A single diagnostic with more than that almost certainly has to
      /// be simplified anyway.
      MaxArguments = PartialDiagnostic::MaxArguments
  };

  /// \brief The number of entries in Arguments.
  unsigned char NumDiagArgs = 0;

  /// \brief Specifies for each argument whether it is in DiagArgumentsStr
  /// or in DiagArguments.
  unsigned char DiagArgumentsKind[MaxArguments];

  /// \brief The values for the various substitution positions.
  ///
  /// This is used when the argument is not an std::string. The specific value
  /// is mangled into an intptr_t and the interpretation depends on exactly
  /// what sort of argument kind it is.
  intptr_t DiagArgumentsVal[MaxArguments];

  /// \brief The values for the various substitution positions that have
  /// string arguments.
  std::string DiagArgumentsStr[MaxArguments];

  /// \brief The list of ranges added to this diagnostic.
  SmallVector<CharSourceRange, 8> DiagRanges;

  /// \brief If valid, provides a hint with some code to insert, remove, or
  /// modify at a particular position.
  SmallVector<FixItHint, 6>  FixItHints;

  Storage() = default;
};

/// \brief An allocator for Storage objects, which uses a small cache to
/// objects, used to reduce malloc()/free() traffic for partial diagnostics.
class StorageAllocator {
  static const unsigned NumCached = 16;
  Storage Cached[NumCached];
  Storage *FreeList[NumCached];
  unsigned NumFreeListEntries;

public:
  StorageAllocator();
  ~StorageAllocator();

  /// \brief Allocate new storage.
  Storage *Allocate() {
    if (NumFreeListEntries == 0)
      return new Storage;

    Storage *Result = FreeList[--NumFreeListEntries];
    Result->NumDiagArgs = 0;
    Result->DiagRanges.clear();
    Result->FixItHints.clear();
    return Result;
  }

  /// \brief Free the given storage object.
  void Deallocate(Storage *S) {
    if (S >= Cached && S <= Cached + NumCached) {
      FreeList[NumFreeListEntries++] = S;
      return;
    }

    delete S;
  }
};

118private:
// NOTE: Sema assumes that PartialDiagnostic is location-invariant
// in the sense that its bits can be safely memcpy'ed and destructed
// in the new location.

/// \brief The diagnostic ID.
mutable unsigned DiagID = 0;

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

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

/// \brief Retrieve storage for this particular diagnostic.
Storage *getStorage() const {
  if (DiagStorage)
14
←
Taking false branch→
    return DiagStorage;

  if (Allocator)
15
←
Assuming the condition is false→
16
←
Taking false branch→
    DiagStorage = Allocator->Allocate();
  else {
    assert(Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))(static_cast <bool> (Allocator != reinterpret_cast<StorageAllocator
 *>(~uintptr_t(0))) ? void (0) : __assert_fail ("Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0))"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 140, __extension__ __PRETTY_FUNCTION__));
    DiagStorage = new Storage;
17
←
Memory is allocated→
  }
  return DiagStorage;
}

void freeStorage() {
  if (!DiagStorage)
    return;

  // The hot path for PartialDiagnostic is when we just used it to wrap an ID
  // (typically so we have the flexibility of passing a more complex
  // diagnostic into the callee, but that does not commonly occur).
  //
  // Split this out into a slow function for silly compilers (*cough*) which
  // can't do decent partial inlining.
  freeStorageSlow();
}

void freeStorageSlow() {
  if (Allocator)
    Allocator->Deallocate(DiagStorage);
  else if (Allocator != reinterpret_cast<StorageAllocator *>(~uintptr_t(0)))
    delete DiagStorage;
  DiagStorage = nullptr;
}

void AddSourceRange(const CharSourceRange &R) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->DiagRanges.push_back(R);
}

void AddFixItHint(const FixItHint &Hint) const {
  if (Hint.isNull())
    return;

  if (!DiagStorage)
    DiagStorage = getStorage();

  DiagStorage->FixItHints.push_back(Hint);
}

184public:
struct NullDiagnostic {};

/// \brief Create a null partial diagnostic, which cannot carry a payload,
/// and only exists to be swapped with a real partial diagnostic.
PartialDiagnostic(NullDiagnostic) {}

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

PartialDiagnostic(const PartialDiagnostic &Other)
    : DiagID(Other.DiagID), Allocator(Other.Allocator) {
  if (Other.DiagStorage) {
    DiagStorage = getStorage();
    *DiagStorage = *Other.DiagStorage;
  }
}

PartialDiagnostic(PartialDiagnostic &&Other)
    : DiagID(Other.DiagID), DiagStorage(Other.DiagStorage),
      Allocator(Other.Allocator) {
  Other.DiagStorage = nullptr;
}

PartialDiagnostic(const PartialDiagnostic &Other, Storage *DiagStorage)
    : DiagID(Other.DiagID), DiagStorage(DiagStorage),
      Allocator(reinterpret_cast<StorageAllocator *>(~uintptr_t(0))) {
  if (Other.DiagStorage)
    *this->DiagStorage = *Other.DiagStorage;
}

PartialDiagnostic(const Diagnostic &Other, StorageAllocator &Allocator)
    : DiagID(Other.getID()), Allocator(&Allocator) {
  // Copy arguments.
  for (unsigned I = 0, N = Other.getNumArgs(); I != N; ++I) {
    if (Other.getArgKind(I) == DiagnosticsEngine::ak_std_string)
      AddString(Other.getArgStdStr(I));
    else
      AddTaggedVal(Other.getRawArg(I), Other.getArgKind(I));
  }

  // Copy source ranges.
  for (unsigned I = 0, N = Other.getNumRanges(); I != N; ++I)
    AddSourceRange(Other.getRange(I));

  // Copy fix-its.
  for (unsigned I = 0, N = Other.getNumFixItHints(); I != N; ++I)
    AddFixItHint(Other.getFixItHint(I));
}

PartialDiagnostic &operator=(const PartialDiagnostic &Other) {
  DiagID = Other.DiagID;
  if (Other.DiagStorage) {
    if (!DiagStorage)
      DiagStorage = getStorage();

    *DiagStorage = *Other.DiagStorage;
  } else {
    freeStorage();
  }

  return *this;
}

PartialDiagnostic &operator=(PartialDiagnostic &&Other) {
  freeStorage();

  DiagID = Other.DiagID;
  DiagStorage = Other.DiagStorage;
  Allocator = Other.Allocator;

  Other.DiagStorage = nullptr;
  return *this;
}

~PartialDiagnostic() {
  freeStorage();
}

void swap(PartialDiagnostic &PD) {
  std::swap(DiagID, PD.DiagID);
  std::swap(DiagStorage, PD.DiagStorage);
  std::swap(Allocator, PD.Allocator);
}

unsigned getDiagID() const { return DiagID; }

void AddTaggedVal(intptr_t V, DiagnosticsEngine::ArgumentKind Kind) const {
  if (!DiagStorage)
11
←
Assuming the condition is true→
12
←
Taking true branch→
    DiagStorage = getStorage();
13
←
Calling 'PartialDiagnostic::getStorage'→
18
←
Returned allocated memory→

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 276, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs] = Kind;
  DiagStorage->DiagArgumentsVal[DiagStorage->NumDiagArgs++] = V;
}

void AddString(StringRef V) const {
  if (!DiagStorage)
    DiagStorage = getStorage();

  assert(DiagStorage->NumDiagArgs < Storage::MaxArguments &&(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __extension__ __PRETTY_FUNCTION__))
         "Too many arguments to diagnostic!")(static_cast <bool> (DiagStorage->NumDiagArgs < Storage
::MaxArguments && "Too many arguments to diagnostic!"
) ? void (0) : __assert_fail ("DiagStorage->NumDiagArgs < Storage::MaxArguments && \"Too many arguments to diagnostic!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 286, __extension__ __PRETTY_FUNCTION__));
  DiagStorage->DiagArgumentsKind[DiagStorage->NumDiagArgs]
    = DiagnosticsEngine::ak_std_string;
  DiagStorage->DiagArgumentsStr[DiagStorage->NumDiagArgs++] = V;
}

void Emit(const DiagnosticBuilder &DB) const {
  if (!DiagStorage)
    return;

  // Add all arguments.
  for (unsigned i = 0, e = DiagStorage->NumDiagArgs; i != e; ++i) {
    if ((DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]
          == DiagnosticsEngine::ak_std_string)
      DB.AddString(DiagStorage->DiagArgumentsStr[i]);
    else
      DB.AddTaggedVal(DiagStorage->DiagArgumentsVal[i],
          (DiagnosticsEngine::ArgumentKind)DiagStorage->DiagArgumentsKind[i]);
  }

  // Add all ranges.
  for (const CharSourceRange &Range : DiagStorage->DiagRanges)
    DB.AddSourceRange(Range);

  // Add all fix-its.
  for (const FixItHint &Fix : DiagStorage->FixItHints)
    DB.AddFixItHint(Fix);
}

void EmitToString(DiagnosticsEngine &Diags,
                  SmallVectorImpl<char> &Buf) const {
  // FIXME: It should be possible to render a diagnostic to a string without
  //        messing with the state of the diagnostics engine.
  DiagnosticBuilder DB(Diags.Report(getDiagID()));
  Emit(DB);
  DB.FlushCounts();
  Diagnostic(&Diags).FormatDiagnostic(Buf);
  DB.Clear();
  Diags.Clear();
}

/// \brief Clear out this partial diagnostic, giving it a new diagnostic ID
/// and removing all of its arguments, ranges, and fix-it hints.
void Reset(unsigned DiagID = 0) {
  this->DiagID = DiagID;
  freeStorage();
}

bool hasStorage() const { return DiagStorage != nullptr; }

/// Retrieve the string argument at the given index.
StringRef getStringArg(unsigned I) {
  assert(DiagStorage && "No diagnostic storage?")(static_cast <bool> (DiagStorage && "No diagnostic storage?"
) ? void (0) : __assert_fail ("DiagStorage && \"No diagnostic storage?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 338, __extension__ __PRETTY_FUNCTION__));
  assert(I < DiagStorage->NumDiagArgs && "Not enough diagnostic args")(static_cast <bool> (I < DiagStorage->NumDiagArgs
 && "Not enough diagnostic args") ? void (0) : __assert_fail
 ("I < DiagStorage->NumDiagArgs && \"Not enough diagnostic args\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 339, __extension__ __PRETTY_FUNCTION__));
  assert(DiagStorage->DiagArgumentsKind[I](static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __extension__ __PRETTY_FUNCTION__))
           == DiagnosticsEngine::ak_std_string && "Not a string arg")(static_cast <bool> (DiagStorage->DiagArgumentsKind[
I] == DiagnosticsEngine::ak_std_string && "Not a string arg"
) ? void (0) : __assert_fail ("DiagStorage->DiagArgumentsKind[I] == DiagnosticsEngine::ak_std_string && \"Not a string arg\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include/clang/Basic/PartialDiagnostic.h"
, 341, __extension__ __PRETTY_FUNCTION__));
  return DiagStorage->DiagArgumentsStr[I];
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           unsigned I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_uint);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           int I) {
  PD.AddTaggedVal(I, DiagnosticsEngine::ak_sint);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const char *S) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(S),
10
←
Calling 'PartialDiagnostic::AddTaggedVal'→
19
←
Returned allocated memory→
                  DiagnosticsEngine::ak_c_string);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  StringRef S) {

  PD.AddString(S);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const IdentifierInfo *II) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(II),
                  DiagnosticsEngine::ak_identifierinfo);
  return PD;
}

// Adds a DeclContext to the diagnostic. The enable_if template magic is here
// so that we only match those arguments that are (statically) DeclContexts;
// other arguments that derive from DeclContext (e.g., RecordDecls) will not
// match.
template<typename T>
friend inline
typename std::enable_if<std::is_same<T, DeclContext>::value,
                        const PartialDiagnostic &>::type
operator<<(const PartialDiagnostic &PD, T *DC) {
  PD.AddTaggedVal(reinterpret_cast<intptr_t>(DC),
                  DiagnosticsEngine::ak_declcontext);
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  SourceRange R) {
  PD.AddSourceRange(CharSourceRange::getTokenRange(R));
  return PD;
}

friend inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                                  const CharSourceRange &R) {
  PD.AddSourceRange(R);
  return PD;
}

friend const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                           const FixItHint &Hint) {
  PD.AddFixItHint(Hint);
  return PD;
}
409};

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

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

421} // namespace clang

423#endif // LLVM_CLANG_BASIC_PARTIALDIAGNOSTIC_H