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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 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CLANG_SEMA_SEMA_H
16 #define LLVM_CLANG_SEMA_SEMA_H
17 
18 #include "clang/Sema/Ownership.h"
19 #include "clang/Sema/AnalysisBasedWarnings.h"
20 #include "clang/Sema/IdentifierResolver.h"
21 #include "clang/Sema/ObjCMethodList.h"
22 #include "clang/Sema/DeclSpec.h"
23 #include "clang/Sema/ExternalSemaSource.h"
24 #include "clang/Sema/LocInfoType.h"
25 #include "clang/Sema/TypoCorrection.h"
26 #include "clang/Sema/Weak.h"
27 #include "clang/AST/Expr.h"
28 #include "clang/AST/ExprObjC.h"
29 #include "clang/AST/DeclarationName.h"
30 #include "clang/AST/ExternalASTSource.h"
31 #include "clang/AST/TypeLoc.h"
32 #include "clang/AST/NSAPI.h"
33 #include "clang/Lex/ModuleLoader.h"
34 #include "clang/Basic/Specifiers.h"
35 #include "clang/Basic/TemplateKinds.h"
36 #include "clang/Basic/TypeTraits.h"
37 #include "clang/Basic/ExpressionTraits.h"
38 #include "llvm/ADT/ArrayRef.h"
39 #include "llvm/ADT/OwningPtr.h"
40 #include "llvm/ADT/SmallPtrSet.h"
41 #include "llvm/ADT/SmallVector.h"
42 #include <deque>
43 #include <string>
44 
45 namespace llvm {
46   class APSInt;
47   template <typename ValueT> struct DenseMapInfo;
48   template <typename ValueT, typename ValueInfoT> class DenseSet;
49   class SmallBitVector;
50 }
51 
52 namespace clang {
53   class ADLResult;
54   class ASTConsumer;
55   class ASTContext;
56   class ASTMutationListener;
57   class ASTReader;
58   class ASTWriter;
59   class ArrayType;
60   class AttributeList;
61   class BlockDecl;
62   class CXXBasePath;
63   class CXXBasePaths;
64   class CXXBindTemporaryExpr;
65   typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
66   class CXXConstructorDecl;
67   class CXXConversionDecl;
68   class CXXDestructorDecl;
69   class CXXFieldCollector;
70   class CXXMemberCallExpr;
71   class CXXMethodDecl;
72   class CXXScopeSpec;
73   class CXXTemporary;
74   class CXXTryStmt;
75   class CallExpr;
76   class ClassTemplateDecl;
77   class ClassTemplatePartialSpecializationDecl;
78   class ClassTemplateSpecializationDecl;
79   class CodeCompleteConsumer;
80   class CodeCompletionAllocator;
81   class CodeCompletionTUInfo;
82   class CodeCompletionResult;
83   class Decl;
84   class DeclAccessPair;
85   class DeclContext;
86   class DeclRefExpr;
87   class DeclaratorDecl;
88   class DeducedTemplateArgument;
89   class DependentDiagnostic;
90   class DesignatedInitExpr;
91   class Designation;
92   class EnumConstantDecl;
93   class Expr;
94   class ExtVectorType;
95   class ExternalSemaSource;
96   class FormatAttr;
97   class FriendDecl;
98   class FunctionDecl;
99   class FunctionProtoType;
100   class FunctionTemplateDecl;
101   class ImplicitConversionSequence;
102   class InitListExpr;
103   class InitializationKind;
104   class InitializationSequence;
105   class InitializedEntity;
106   class IntegerLiteral;
107   class LabelStmt;
108   class LambdaExpr;
109   class LangOptions;
110   class LocalInstantiationScope;
111   class LookupResult;
112   class MacroInfo;
113   class MultiLevelTemplateArgumentList;
114   class NamedDecl;
115   class NonNullAttr;
116   class ObjCCategoryDecl;
117   class ObjCCategoryImplDecl;
118   class ObjCCompatibleAliasDecl;
119   class ObjCContainerDecl;
120   class ObjCImplDecl;
121   class ObjCImplementationDecl;
122   class ObjCInterfaceDecl;
123   class ObjCIvarDecl;
124   template <class T> class ObjCList;
125   class ObjCMessageExpr;
126   class ObjCMethodDecl;
127   class ObjCPropertyDecl;
128   class ObjCProtocolDecl;
129   class OverloadCandidateSet;
130   class OverloadExpr;
131   class ParenListExpr;
132   class ParmVarDecl;
133   class Preprocessor;
134   class PseudoDestructorTypeStorage;
135   class PseudoObjectExpr;
136   class QualType;
137   class StandardConversionSequence;
138   class Stmt;
139   class StringLiteral;
140   class SwitchStmt;
141   class TargetAttributesSema;
142   class TemplateArgument;
143   class TemplateArgumentList;
144   class TemplateArgumentLoc;
145   class TemplateDecl;
146   class TemplateParameterList;
147   class TemplatePartialOrderingContext;
148   class TemplateTemplateParmDecl;
149   class Token;
150   class TypeAliasDecl;
151   class TypedefDecl;
152   class TypedefNameDecl;
153   class TypeLoc;
154   class UnqualifiedId;
155   class UnresolvedLookupExpr;
156   class UnresolvedMemberExpr;
157   class UnresolvedSetImpl;
158   class UnresolvedSetIterator;
159   class UsingDecl;
160   class UsingShadowDecl;
161   class ValueDecl;
162   class VarDecl;
163   class VisibilityAttr;
164   class VisibleDeclConsumer;
165   class IndirectFieldDecl;
166 
167 namespace sema {
168   class AccessedEntity;
169   class BlockScopeInfo;
170   class CompoundScopeInfo;
171   class DelayedDiagnostic;
172   class FunctionScopeInfo;
173   class LambdaScopeInfo;
174   class PossiblyUnreachableDiag;
175   class TemplateDeductionInfo;
176 }
177 
178 // FIXME: No way to easily map from TemplateTypeParmTypes to
179 // TemplateTypeParmDecls, so we have this horrible PointerUnion.
180 typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
181                   SourceLocation> UnexpandedParameterPack;
182 
183 /// Sema - This implements semantic analysis and AST building for C.
184 class Sema {
185   Sema(const Sema&);           // DO NOT IMPLEMENT
186   void operator=(const Sema&); // DO NOT IMPLEMENT
187   mutable const TargetAttributesSema* TheTargetAttributesSema;
188 public:
189   typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
190   typedef OpaquePtr<TemplateName> TemplateTy;
191   typedef OpaquePtr<QualType> TypeTy;
192 
193   OpenCLOptions OpenCLFeatures;
194   FPOptions FPFeatures;
195 
196   const LangOptions &LangOpts;
197   Preprocessor &PP;
198   ASTContext &Context;
199   ASTConsumer &Consumer;
200   DiagnosticsEngine &Diags;
201   SourceManager &SourceMgr;
202 
203   /// \brief Flag indicating whether or not to collect detailed statistics.
204   bool CollectStats;
205 
206   /// \brief Source of additional semantic information.
207   ExternalSemaSource *ExternalSource;
208 
209   /// \brief Code-completion consumer.
210   CodeCompleteConsumer *CodeCompleter;
211 
212   /// CurContext - This is the current declaration context of parsing.
213   DeclContext *CurContext;
214 
215   /// \brief Generally null except when we temporarily switch decl contexts,
216   /// like in \see ActOnObjCTemporaryExitContainerContext.
217   DeclContext *OriginalLexicalContext;
218 
219   /// VAListTagName - The declaration name corresponding to __va_list_tag.
220   /// This is used as part of a hack to omit that class from ADL results.
221   DeclarationName VAListTagName;
222 
223   /// PackContext - Manages the stack for #pragma pack. An alignment
224   /// of 0 indicates default alignment.
225   void *PackContext; // Really a "PragmaPackStack*"
226 
227   bool MSStructPragmaOn; // True when #pragma ms_struct on
228 
229   /// VisContext - Manages the stack for #pragma GCC visibility.
230   void *VisContext; // Really a "PragmaVisStack*"
231 
232   /// ExprNeedsCleanups - True if the current evaluation context
233   /// requires cleanups to be run at its conclusion.
234   bool ExprNeedsCleanups;
235 
236   /// ExprCleanupObjects - This is the stack of objects requiring
237   /// cleanup that are created by the current full expression.  The
238   /// element type here is ExprWithCleanups::Object.
239   SmallVector<BlockDecl*, 8> ExprCleanupObjects;
240 
241   llvm::SmallPtrSet<Expr*, 8> MaybeODRUseExprs;
242 
243   /// \brief Stack containing information about each of the nested
244   /// function, block, and method scopes that are currently active.
245   ///
246   /// This array is never empty.  Clients should ignore the first
247   /// element, which is used to cache a single FunctionScopeInfo
248   /// that's used to parse every top-level function.
249   SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;
250 
251   typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
252                      &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
253     ExtVectorDeclsType;
254 
255   /// ExtVectorDecls - This is a list all the extended vector types. This allows
256   /// us to associate a raw vector type with one of the ext_vector type names.
257   /// This is only necessary for issuing pretty diagnostics.
258   ExtVectorDeclsType ExtVectorDecls;
259 
260   /// \brief The set of types for which we have already complained about the
261   /// definitions being hidden.
262   ///
263   /// This set is used to suppress redundant diagnostics.
264   llvm::SmallPtrSet<NamedDecl *, 4> HiddenDefinitions;
265 
266   /// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
267   OwningPtr<CXXFieldCollector> FieldCollector;
268 
269   typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
270 
271   /// PureVirtualClassDiagSet - a set of class declarations which we have
272   /// emitted a list of pure virtual functions. Used to prevent emitting the
273   /// same list more than once.
274   OwningPtr<RecordDeclSetTy> PureVirtualClassDiagSet;
275 
276   /// ParsingInitForAutoVars - a set of declarations with auto types for which
277   /// we are currently parsing the initializer.
278   llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
279 
280   /// \brief A mapping from external names to the most recent
281   /// locally-scoped external declaration with that name.
282   ///
283   /// This map contains external declarations introduced in local
284   /// scoped, e.g.,
285   ///
286   /// \code
287   /// void f() {
288   ///   void foo(int, int);
289   /// }
290   /// \endcode
291   ///
292   /// Here, the name "foo" will be associated with the declaration on
293   /// "foo" within f. This name is not visible outside of
294   /// "f". However, we still find it in two cases:
295   ///
296   ///   - If we are declaring another external with the name "foo", we
297   ///     can find "foo" as a previous declaration, so that the types
298   ///     of this external declaration can be checked for
299   ///     compatibility.
300   ///
301   ///   - If we would implicitly declare "foo" (e.g., due to a call to
302   ///     "foo" in C when no prototype or definition is visible), then
303   ///     we find this declaration of "foo" and complain that it is
304   ///     not visible.
305   llvm::DenseMap<DeclarationName, NamedDecl *> LocallyScopedExternalDecls;
306 
307   /// \brief Look for a locally scoped external declaration by the given name.
308   llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
309   findLocallyScopedExternalDecl(DeclarationName Name);
310 
311   typedef LazyVector<VarDecl *, ExternalSemaSource,
312                      &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
313     TentativeDefinitionsType;
314 
315   /// \brief All the tentative definitions encountered in the TU.
316   TentativeDefinitionsType TentativeDefinitions;
317 
318   typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
319                      &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
320     UnusedFileScopedDeclsType;
321 
322   /// \brief The set of file scoped decls seen so far that have not been used
323   /// and must warn if not used. Only contains the first declaration.
324   UnusedFileScopedDeclsType UnusedFileScopedDecls;
325 
326   typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
327                      &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
328     DelegatingCtorDeclsType;
329 
330   /// \brief All the delegating constructors seen so far in the file, used for
331   /// cycle detection at the end of the TU.
332   DelegatingCtorDeclsType DelegatingCtorDecls;
333 
334   /// \brief All the overriding destructors seen during a class definition
335   /// (there could be multiple due to nested classes) that had their exception
336   /// spec checks delayed, plus the overridden destructor.
337   SmallVector<std::pair<const CXXDestructorDecl*,
338                               const CXXDestructorDecl*>, 2>
339       DelayedDestructorExceptionSpecChecks;
340 
341   /// \brief Callback to the parser to parse templated functions when needed.
342   typedef void LateTemplateParserCB(void *P, const FunctionDecl *FD);
343   LateTemplateParserCB *LateTemplateParser;
344   void *OpaqueParser;
345 
SetLateTemplateParser(LateTemplateParserCB * LTP,void * P)346   void SetLateTemplateParser(LateTemplateParserCB *LTP, void *P) {
347     LateTemplateParser = LTP;
348     OpaqueParser = P;
349   }
350 
351   class DelayedDiagnostics;
352 
353   class ParsingDeclState {
354     unsigned SavedStackSize;
355     friend class Sema::DelayedDiagnostics;
356   };
357 
358   class ProcessingContextState {
359     unsigned SavedParsingDepth;
360     unsigned SavedActiveStackBase;
361     friend class Sema::DelayedDiagnostics;
362   };
363 
364   /// A class which encapsulates the logic for delaying diagnostics
365   /// during parsing and other processing.
366   class DelayedDiagnostics {
367     /// \brief The stack of diagnostics that were delayed due to being
368     /// produced during the parsing of a declaration.
369     sema::DelayedDiagnostic *Stack;
370 
371     /// \brief The number of objects on the delayed-diagnostics stack.
372     unsigned StackSize;
373 
374     /// \brief The current capacity of the delayed-diagnostics stack.
375     unsigned StackCapacity;
376 
377     /// \brief The index of the first "active" delayed diagnostic in
378     /// the stack.  When parsing class definitions, we ignore active
379     /// delayed diagnostics from the surrounding context.
380     unsigned ActiveStackBase;
381 
382     /// \brief The depth of the declarations we're currently parsing.
383     /// This gets saved and reset whenever we enter a class definition.
384     unsigned ParsingDepth;
385 
386   public:
DelayedDiagnostics()387     DelayedDiagnostics() : Stack(0), StackSize(0), StackCapacity(0),
388       ActiveStackBase(0), ParsingDepth(0) {}
389 
~DelayedDiagnostics()390     ~DelayedDiagnostics() {
391       delete[] reinterpret_cast<char*>(Stack);
392     }
393 
394     /// Adds a delayed diagnostic.
395     void add(const sema::DelayedDiagnostic &diag);
396 
397     /// Determines whether diagnostics should be delayed.
shouldDelayDiagnostics()398     bool shouldDelayDiagnostics() { return ParsingDepth > 0; }
399 
400     /// Observe that we've started parsing a declaration.  Access and
401     /// deprecation diagnostics will be delayed; when the declaration
402     /// is completed, all active delayed diagnostics will be evaluated
403     /// in its context, and then active diagnostics stack will be
404     /// popped down to the saved depth.
pushParsingDecl()405     ParsingDeclState pushParsingDecl() {
406       ParsingDepth++;
407 
408       ParsingDeclState state;
409       state.SavedStackSize = StackSize;
410       return state;
411     }
412 
413     /// Observe that we're completed parsing a declaration.
414     static void popParsingDecl(Sema &S, ParsingDeclState state, Decl *decl);
415 
416     /// Observe that we've started processing a different context, the
417     /// contents of which are semantically separate from the
418     /// declarations it may lexically appear in.  This sets aside the
419     /// current stack of active diagnostics and starts afresh.
pushContext()420     ProcessingContextState pushContext() {
421       assert(StackSize >= ActiveStackBase);
422 
423       ProcessingContextState state;
424       state.SavedParsingDepth = ParsingDepth;
425       state.SavedActiveStackBase = ActiveStackBase;
426 
427       ActiveStackBase = StackSize;
428       ParsingDepth = 0;
429 
430       return state;
431     }
432 
433     /// Observe that we've stopped processing a context.  This
434     /// restores the previous stack of active diagnostics.
popContext(ProcessingContextState state)435     void popContext(ProcessingContextState state) {
436       assert(ActiveStackBase == StackSize);
437       assert(ParsingDepth == 0);
438       ActiveStackBase = state.SavedActiveStackBase;
439       ParsingDepth = state.SavedParsingDepth;
440     }
441   } DelayedDiagnostics;
442 
443   /// A RAII object to temporarily push a declaration context.
444   class ContextRAII {
445   private:
446     Sema &S;
447     DeclContext *SavedContext;
448     ProcessingContextState SavedContextState;
449     QualType SavedCXXThisTypeOverride;
450 
451   public:
ContextRAII(Sema & S,DeclContext * ContextToPush)452     ContextRAII(Sema &S, DeclContext *ContextToPush)
453       : S(S), SavedContext(S.CurContext),
454         SavedContextState(S.DelayedDiagnostics.pushContext()),
455         SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
456     {
457       assert(ContextToPush && "pushing null context");
458       S.CurContext = ContextToPush;
459     }
460 
pop()461     void pop() {
462       if (!SavedContext) return;
463       S.CurContext = SavedContext;
464       S.DelayedDiagnostics.popContext(SavedContextState);
465       S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
466       SavedContext = 0;
467     }
468 
~ContextRAII()469     ~ContextRAII() {
470       pop();
471     }
472   };
473 
474   /// WeakUndeclaredIdentifiers - Identifiers contained in
475   /// #pragma weak before declared. rare. may alias another
476   /// identifier, declared or undeclared
477   llvm::DenseMap<IdentifierInfo*,WeakInfo> WeakUndeclaredIdentifiers;
478 
479   /// ExtnameUndeclaredIdentifiers - Identifiers contained in
480   /// #pragma redefine_extname before declared.  Used in Solaris system headers
481   /// to define functions that occur in multiple standards to call the version
482   /// in the currently selected standard.
483   llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;
484 
485 
486   /// \brief Load weak undeclared identifiers from the external source.
487   void LoadExternalWeakUndeclaredIdentifiers();
488 
489   /// WeakTopLevelDecl - Translation-unit scoped declarations generated by
490   /// #pragma weak during processing of other Decls.
491   /// I couldn't figure out a clean way to generate these in-line, so
492   /// we store them here and handle separately -- which is a hack.
493   /// It would be best to refactor this.
494   SmallVector<Decl*,2> WeakTopLevelDecl;
495 
496   IdentifierResolver IdResolver;
497 
498   /// Translation Unit Scope - useful to Objective-C actions that need
499   /// to lookup file scope declarations in the "ordinary" C decl namespace.
500   /// For example, user-defined classes, built-in "id" type, etc.
501   Scope *TUScope;
502 
503   /// \brief The C++ "std" namespace, where the standard library resides.
504   LazyDeclPtr StdNamespace;
505 
506   /// \brief The C++ "std::bad_alloc" class, which is defined by the C++
507   /// standard library.
508   LazyDeclPtr StdBadAlloc;
509 
510   /// \brief The C++ "std::initializer_list" template, which is defined in
511   /// <initializer_list>.
512   ClassTemplateDecl *StdInitializerList;
513 
514   /// \brief The C++ "type_info" declaration, which is defined in <typeinfo>.
515   RecordDecl *CXXTypeInfoDecl;
516 
517   /// \brief The MSVC "_GUID" struct, which is defined in MSVC header files.
518   RecordDecl *MSVCGuidDecl;
519 
520   /// \brief Caches identifiers/selectors for NSFoundation APIs.
521   llvm::OwningPtr<NSAPI> NSAPIObj;
522 
523   /// \brief The declaration of the Objective-C NSNumber class.
524   ObjCInterfaceDecl *NSNumberDecl;
525 
526   /// \brief Pointer to NSNumber type (NSNumber *).
527   QualType NSNumberPointer;
528 
529   /// \brief The Objective-C NSNumber methods used to create NSNumber literals.
530   ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
531 
532   /// \brief The declaration of the Objective-C NSString class.
533   ObjCInterfaceDecl *NSStringDecl;
534 
535   /// \brief Pointer to NSString type (NSString *).
536   QualType NSStringPointer;
537 
538   /// \brief The declaration of the stringWithUTF8String: method.
539   ObjCMethodDecl *StringWithUTF8StringMethod;
540 
541   /// \brief The declaration of the Objective-C NSArray class.
542   ObjCInterfaceDecl *NSArrayDecl;
543 
544   /// \brief The declaration of the arrayWithObjects:count: method.
545   ObjCMethodDecl *ArrayWithObjectsMethod;
546 
547   /// \brief The declaration of the Objective-C NSDictionary class.
548   ObjCInterfaceDecl *NSDictionaryDecl;
549 
550   /// \brief The declaration of the dictionaryWithObjects:forKeys:count: method.
551   ObjCMethodDecl *DictionaryWithObjectsMethod;
552 
553   /// \brief id<NSCopying> type.
554   QualType QIDNSCopying;
555 
556   /// A flag to remember whether the implicit forms of operator new and delete
557   /// have been declared.
558   bool GlobalNewDeleteDeclared;
559 
560   /// A flag that is set when parsing a -dealloc method and no [super dealloc]
561   /// call was found yet.
562   bool ObjCShouldCallSuperDealloc;
563   /// A flag that is set when parsing a -finalize method and no [super finalize]
564   /// call was found yet.
565   bool ObjCShouldCallSuperFinalize;
566 
567   /// \brief Describes how the expressions currently being parsed are
568   /// evaluated at run-time, if at all.
569   enum ExpressionEvaluationContext {
570     /// \brief The current expression and its subexpressions occur within an
571     /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
572     /// \c sizeof, where the type of the expression may be significant but
573     /// no code will be generated to evaluate the value of the expression at
574     /// run time.
575     Unevaluated,
576 
577     /// \brief The current context is "potentially evaluated" in C++11 terms,
578     /// but the expression is evaluated at compile-time (like the values of
579     /// cases in a switch statment).
580     ConstantEvaluated,
581 
582     /// \brief The current expression is potentially evaluated at run time,
583     /// which means that code may be generated to evaluate the value of the
584     /// expression at run time.
585     PotentiallyEvaluated,
586 
587     /// \brief The current expression is potentially evaluated, but any
588     /// declarations referenced inside that expression are only used if
589     /// in fact the current expression is used.
590     ///
591     /// This value is used when parsing default function arguments, for which
592     /// we would like to provide diagnostics (e.g., passing non-POD arguments
593     /// through varargs) but do not want to mark declarations as "referenced"
594     /// until the default argument is used.
595     PotentiallyEvaluatedIfUsed
596   };
597 
598   /// \brief Data structure used to record current or nested
599   /// expression evaluation contexts.
600   struct ExpressionEvaluationContextRecord {
601     /// \brief The expression evaluation context.
602     ExpressionEvaluationContext Context;
603 
604     /// \brief Whether the enclosing context needed a cleanup.
605     bool ParentNeedsCleanups;
606 
607     /// \brief Whether we are in a decltype expression.
608     bool IsDecltype;
609 
610     /// \brief The number of active cleanup objects when we entered
611     /// this expression evaluation context.
612     unsigned NumCleanupObjects;
613 
614     llvm::SmallPtrSet<Expr*, 8> SavedMaybeODRUseExprs;
615 
616     /// \brief The lambdas that are present within this context, if it
617     /// is indeed an unevaluated context.
618     llvm::SmallVector<LambdaExpr *, 2> Lambdas;
619 
620     /// \brief The declaration that provides context for the lambda expression
621     /// if the normal declaration context does not suffice, e.g., in a
622     /// default function argument.
623     Decl *LambdaContextDecl;
624 
625     /// \brief The context information used to mangle lambda expressions
626     /// within this context.
627     ///
628     /// This mangling information is allocated lazily, since most contexts
629     /// do not have lambda expressions.
630     LambdaMangleContext *LambdaMangle;
631 
632     /// \brief If we are processing a decltype type, a set of call expressions
633     /// for which we have deferred checking the completeness of the return type.
634     llvm::SmallVector<CallExpr*, 8> DelayedDecltypeCalls;
635 
636     /// \brief If we are processing a decltype type, a set of temporary binding
637     /// expressions for which we have deferred checking the destructor.
638     llvm::SmallVector<CXXBindTemporaryExpr*, 8> DelayedDecltypeBinds;
639 
ExpressionEvaluationContextRecordExpressionEvaluationContextRecord640     ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
641                                       unsigned NumCleanupObjects,
642                                       bool ParentNeedsCleanups,
643                                       Decl *LambdaContextDecl,
644                                       bool IsDecltype)
645       : Context(Context), ParentNeedsCleanups(ParentNeedsCleanups),
646         IsDecltype(IsDecltype), NumCleanupObjects(NumCleanupObjects),
647         LambdaContextDecl(LambdaContextDecl), LambdaMangle() { }
648 
~ExpressionEvaluationContextRecordExpressionEvaluationContextRecord649     ~ExpressionEvaluationContextRecord() {
650       delete LambdaMangle;
651     }
652 
653     /// \brief Retrieve the mangling context for lambdas.
getLambdaMangleContextExpressionEvaluationContextRecord654     LambdaMangleContext &getLambdaMangleContext() {
655       assert(LambdaContextDecl && "Need to have a lambda context declaration");
656       if (!LambdaMangle)
657         LambdaMangle = new LambdaMangleContext;
658       return *LambdaMangle;
659     }
660   };
661 
662   /// A stack of expression evaluation contexts.
663   SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;
664 
665   /// SpecialMemberOverloadResult - The overloading result for a special member
666   /// function.
667   ///
668   /// This is basically a wrapper around PointerIntPair. The lowest bit of the
669   /// integer is used to determine whether we have a parameter qualification
670   /// match, the second-lowest is whether we had success in resolving the
671   /// overload to a unique non-deleted function.
672   ///
673   /// The ConstParamMatch bit represents whether, when looking up a copy
674   /// constructor or assignment operator, we found a potential copy
675   /// constructor/assignment operator whose first parameter is const-qualified.
676   /// This is used for determining parameter types of other objects and is
677   /// utterly meaningless on other types of special members.
678   class SpecialMemberOverloadResult : public llvm::FastFoldingSetNode {
679   public:
680     enum Kind {
681       NoMemberOrDeleted,
682       Ambiguous,
683       SuccessNonConst,
684       SuccessConst
685     };
686 
687   private:
688     llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
689 
690   public:
SpecialMemberOverloadResult(const llvm::FoldingSetNodeID & ID)691     SpecialMemberOverloadResult(const llvm::FoldingSetNodeID &ID)
692       : FastFoldingSetNode(ID)
693     {}
694 
getMethod()695     CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
setMethod(CXXMethodDecl * MD)696     void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
697 
getKind()698     Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
setKind(Kind K)699     void setKind(Kind K) { Pair.setInt(K); }
700 
hasSuccess()701     bool hasSuccess() const { return getKind() >= SuccessNonConst; }
hasConstParamMatch()702     bool hasConstParamMatch() const { return getKind() == SuccessConst; }
703   };
704 
705   /// \brief A cache of special member function overload resolution results
706   /// for C++ records.
707   llvm::FoldingSet<SpecialMemberOverloadResult> SpecialMemberCache;
708 
709   /// \brief The kind of translation unit we are processing.
710   ///
711   /// When we're processing a complete translation unit, Sema will perform
712   /// end-of-translation-unit semantic tasks (such as creating
713   /// initializers for tentative definitions in C) once parsing has
714   /// completed. Modules and precompiled headers perform different kinds of
715   /// checks.
716   TranslationUnitKind TUKind;
717 
718   llvm::BumpPtrAllocator BumpAlloc;
719 
720   /// \brief The number of SFINAE diagnostics that have been trapped.
721   unsigned NumSFINAEErrors;
722 
723   typedef llvm::DenseMap<ParmVarDecl *, SmallVector<ParmVarDecl *, 1> >
724     UnparsedDefaultArgInstantiationsMap;
725 
726   /// \brief A mapping from parameters with unparsed default arguments to the
727   /// set of instantiations of each parameter.
728   ///
729   /// This mapping is a temporary data structure used when parsing
730   /// nested class templates or nested classes of class templates,
731   /// where we might end up instantiating an inner class before the
732   /// default arguments of its methods have been parsed.
733   UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;
734 
735   // Contains the locations of the beginning of unparsed default
736   // argument locations.
737   llvm::DenseMap<ParmVarDecl *,SourceLocation> UnparsedDefaultArgLocs;
738 
739   /// UndefinedInternals - all the used, undefined objects with
740   /// internal linkage in this translation unit.
741   llvm::DenseMap<NamedDecl*, SourceLocation> UndefinedInternals;
742 
743   typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
744   typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
745 
746   /// Method Pool - allows efficient lookup when typechecking messages to "id".
747   /// We need to maintain a list, since selectors can have differing signatures
748   /// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
749   /// of selectors are "overloaded").
750   GlobalMethodPool MethodPool;
751 
752   /// Method selectors used in a @selector expression. Used for implementation
753   /// of -Wselector.
754   llvm::DenseMap<Selector, SourceLocation> ReferencedSelectors;
755 
756   void ReadMethodPool(Selector Sel);
757 
758   /// Private Helper predicate to check for 'self'.
759   bool isSelfExpr(Expr *RExpr);
760 
761   /// \brief Cause the active diagnostic on the DiagosticsEngine to be
762   /// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
763   /// should not be used elsewhere.
764   void EmitCurrentDiagnostic(unsigned DiagID);
765 
766 public:
767   Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
768        TranslationUnitKind TUKind = TU_Complete,
769        CodeCompleteConsumer *CompletionConsumer = 0);
770   ~Sema();
771 
772   /// \brief Perform initialization that occurs after the parser has been
773   /// initialized but before it parses anything.
774   void Initialize();
775 
getLangOpts()776   const LangOptions &getLangOpts() const { return LangOpts; }
getOpenCLOptions()777   OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
getFPOptions()778   FPOptions     &getFPOptions() { return FPFeatures; }
779 
getDiagnostics()780   DiagnosticsEngine &getDiagnostics() const { return Diags; }
getSourceManager()781   SourceManager &getSourceManager() const { return SourceMgr; }
782   const TargetAttributesSema &getTargetAttributesSema() const;
getPreprocessor()783   Preprocessor &getPreprocessor() const { return PP; }
getASTContext()784   ASTContext &getASTContext() const { return Context; }
getASTConsumer()785   ASTConsumer &getASTConsumer() const { return Consumer; }
786   ASTMutationListener *getASTMutationListener() const;
787 
788   void PrintStats() const;
789 
790   /// \brief Helper class that creates diagnostics with optional
791   /// template instantiation stacks.
792   ///
793   /// This class provides a wrapper around the basic DiagnosticBuilder
794   /// class that emits diagnostics. SemaDiagnosticBuilder is
795   /// responsible for emitting the diagnostic (as DiagnosticBuilder
796   /// does) and, if the diagnostic comes from inside a template
797   /// instantiation, printing the template instantiation stack as
798   /// well.
799   class SemaDiagnosticBuilder : public DiagnosticBuilder {
800     Sema &SemaRef;
801     unsigned DiagID;
802 
803   public:
SemaDiagnosticBuilder(DiagnosticBuilder & DB,Sema & SemaRef,unsigned DiagID)804     SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
805       : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }
806 
~SemaDiagnosticBuilder()807     ~SemaDiagnosticBuilder() {
808       // If we aren't active, there is nothing to do.
809       if (!isActive()) return;
810 
811       // Otherwise, we need to emit the diagnostic. First flush the underlying
812       // DiagnosticBuilder data, and clear the diagnostic builder itself so it
813       // won't emit the diagnostic in its own destructor.
814       //
815       // This seems wasteful, in that as written the DiagnosticBuilder dtor will
816       // do its own needless checks to see if the diagnostic needs to be
817       // emitted. However, because we take care to ensure that the builder
818       // objects never escape, a sufficiently smart compiler will be able to
819       // eliminate that code.
820       FlushCounts();
821       Clear();
822 
823       // Dispatch to Sema to emit the diagnostic.
824       SemaRef.EmitCurrentDiagnostic(DiagID);
825     }
826   };
827 
828   /// \brief Emit a diagnostic.
Diag(SourceLocation Loc,unsigned DiagID)829   SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) {
830     DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
831     return SemaDiagnosticBuilder(DB, *this, DiagID);
832   }
833 
834   /// \brief Emit a partial diagnostic.
835   SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic& PD);
836 
837   /// \brief Build a partial diagnostic.
838   PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
839 
840   bool findMacroSpelling(SourceLocation &loc, StringRef name);
841 
842   /// \brief Get a string to suggest for zero-initialization of a type.
843   const char *getFixItZeroInitializerForType(QualType T) const;
844 
Owned(Expr * E)845   ExprResult Owned(Expr* E) { return E; }
Owned(ExprResult R)846   ExprResult Owned(ExprResult R) { return R; }
Owned(Stmt * S)847   StmtResult Owned(Stmt* S) { return S; }
848 
849   void ActOnEndOfTranslationUnit();
850 
851   void CheckDelegatingCtorCycles();
852 
853   Scope *getScopeForContext(DeclContext *Ctx);
854 
855   void PushFunctionScope();
856   void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
857   void PushLambdaScope(CXXRecordDecl *Lambda, CXXMethodDecl *CallOperator);
858   void PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP =0,
859                             const Decl *D = 0, const BlockExpr *blkExpr = 0);
860 
getCurFunction()861   sema::FunctionScopeInfo *getCurFunction() const {
862     return FunctionScopes.back();
863   }
864 
865   void PushCompoundScope();
866   void PopCompoundScope();
867 
868   sema::CompoundScopeInfo &getCurCompoundScope() const;
869 
870   bool hasAnyUnrecoverableErrorsInThisFunction() const;
871 
872   /// \brief Retrieve the current block, if any.
873   sema::BlockScopeInfo *getCurBlock();
874 
875   /// \brief Retrieve the current lambda expression, if any.
876   sema::LambdaScopeInfo *getCurLambda();
877 
878   /// WeakTopLevelDeclDecls - access to #pragma weak-generated Decls
WeakTopLevelDecls()879   SmallVector<Decl*,2> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
880 
881   //===--------------------------------------------------------------------===//
882   // Type Analysis / Processing: SemaType.cpp.
883   //
884 
885   QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs);
BuildQualifiedType(QualType T,SourceLocation Loc,unsigned CVR)886   QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVR) {
887     return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR));
888   }
889   QualType BuildPointerType(QualType T,
890                             SourceLocation Loc, DeclarationName Entity);
891   QualType BuildReferenceType(QualType T, bool LValueRef,
892                               SourceLocation Loc, DeclarationName Entity);
893   QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
894                           Expr *ArraySize, unsigned Quals,
895                           SourceRange Brackets, DeclarationName Entity);
896   QualType BuildExtVectorType(QualType T, Expr *ArraySize,
897                               SourceLocation AttrLoc);
898   QualType BuildFunctionType(QualType T,
899                              QualType *ParamTypes, unsigned NumParamTypes,
900                              bool Variadic, bool HasTrailingReturn,
901                              unsigned Quals, RefQualifierKind RefQualifier,
902                              SourceLocation Loc, DeclarationName Entity,
903                              FunctionType::ExtInfo Info);
904   QualType BuildMemberPointerType(QualType T, QualType Class,
905                                   SourceLocation Loc,
906                                   DeclarationName Entity);
907   QualType BuildBlockPointerType(QualType T,
908                                  SourceLocation Loc, DeclarationName Entity);
909   QualType BuildParenType(QualType T);
910   QualType BuildAtomicType(QualType T, SourceLocation Loc);
911 
912   TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
913   TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
914   TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
915                                                TypeSourceInfo *ReturnTypeInfo);
916 
917   /// \brief Package the given type and TSI into a ParsedType.
918   ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
919   DeclarationNameInfo GetNameForDeclarator(Declarator &D);
920   DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
921   static QualType GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo = 0);
922   CanThrowResult canThrow(const Expr *E);
923   const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
924                                                 const FunctionProtoType *FPT);
925   bool CheckSpecifiedExceptionType(QualType T, const SourceRange &Range);
926   bool CheckDistantExceptionSpec(QualType T);
927   bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
928   bool CheckEquivalentExceptionSpec(
929       const FunctionProtoType *Old, SourceLocation OldLoc,
930       const FunctionProtoType *New, SourceLocation NewLoc);
931   bool CheckEquivalentExceptionSpec(
932       const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
933       const FunctionProtoType *Old, SourceLocation OldLoc,
934       const FunctionProtoType *New, SourceLocation NewLoc,
935       bool *MissingExceptionSpecification = 0,
936       bool *MissingEmptyExceptionSpecification = 0,
937       bool AllowNoexceptAllMatchWithNoSpec = false,
938       bool IsOperatorNew = false);
939   bool CheckExceptionSpecSubset(
940       const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
941       const FunctionProtoType *Superset, SourceLocation SuperLoc,
942       const FunctionProtoType *Subset, SourceLocation SubLoc);
943   bool CheckParamExceptionSpec(const PartialDiagnostic & NoteID,
944       const FunctionProtoType *Target, SourceLocation TargetLoc,
945       const FunctionProtoType *Source, SourceLocation SourceLoc);
946 
947   TypeResult ActOnTypeName(Scope *S, Declarator &D);
948 
949   /// \brief The parser has parsed the context-sensitive type 'instancetype'
950   /// in an Objective-C message declaration. Return the appropriate type.
951   ParsedType ActOnObjCInstanceType(SourceLocation Loc);
952 
953   bool RequireCompleteType(SourceLocation Loc, QualType T,
954                            const PartialDiagnostic &PD,
955                            std::pair<SourceLocation, PartialDiagnostic> Note);
956   bool RequireCompleteType(SourceLocation Loc, QualType T,
957                            const PartialDiagnostic &PD);
958   bool RequireCompleteType(SourceLocation Loc, QualType T,
959                            unsigned DiagID);
960   bool RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD,
961                                std::pair<SourceLocation,
962                                          PartialDiagnostic> Note);
963 
964   bool RequireLiteralType(SourceLocation Loc, QualType T,
965                           const PartialDiagnostic &PD);
966 
967   QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
968                              const CXXScopeSpec &SS, QualType T);
969 
970   QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
971   QualType BuildDecltypeType(Expr *E, SourceLocation Loc);
972   QualType BuildUnaryTransformType(QualType BaseType,
973                                    UnaryTransformType::UTTKind UKind,
974                                    SourceLocation Loc);
975 
976   //===--------------------------------------------------------------------===//
977   // Symbol table / Decl tracking callbacks: SemaDecl.cpp.
978   //
979 
980   /// List of decls defined in a function prototype. This contains EnumConstants
981   /// that incorrectly end up in translation unit scope because there is no
982   /// function to pin them on. ActOnFunctionDeclarator reads this list and patches
983   /// them into the FunctionDecl.
984   std::vector<NamedDecl*> DeclsInPrototypeScope;
985   /// Nonzero if we are currently parsing a function declarator. This is a counter
986   /// as opposed to a boolean so we can deal with nested function declarators
987   /// such as:
988   ///     void f(void (*g)(), ...)
989   unsigned InFunctionDeclarator;
990 
991   DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = 0);
992 
993   void DiagnoseUseOfUnimplementedSelectors();
994 
995   ParsedType getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
996                          Scope *S, CXXScopeSpec *SS = 0,
997                          bool isClassName = false,
998                          bool HasTrailingDot = false,
999                          ParsedType ObjectType = ParsedType(),
1000                          bool IsCtorOrDtorName = false,
1001                          bool WantNontrivialTypeSourceInfo = false,
1002                          IdentifierInfo **CorrectedII = 0);
1003   TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
1004   bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
1005   bool DiagnoseUnknownTypeName(const IdentifierInfo &II,
1006                                SourceLocation IILoc,
1007                                Scope *S,
1008                                CXXScopeSpec *SS,
1009                                ParsedType &SuggestedType);
1010 
1011   /// \brief Describes the result of the name lookup and resolution performed
1012   /// by \c ClassifyName().
1013   enum NameClassificationKind {
1014     NC_Unknown,
1015     NC_Error,
1016     NC_Keyword,
1017     NC_Type,
1018     NC_Expression,
1019     NC_NestedNameSpecifier,
1020     NC_TypeTemplate,
1021     NC_FunctionTemplate
1022   };
1023 
1024   class NameClassification {
1025     NameClassificationKind Kind;
1026     ExprResult Expr;
1027     TemplateName Template;
1028     ParsedType Type;
1029     const IdentifierInfo *Keyword;
1030 
NameClassification(NameClassificationKind Kind)1031     explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}
1032 
1033   public:
NameClassification(ExprResult Expr)1034     NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}
1035 
NameClassification(ParsedType Type)1036     NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}
1037 
NameClassification(const IdentifierInfo * Keyword)1038     NameClassification(const IdentifierInfo *Keyword)
1039       : Kind(NC_Keyword), Keyword(Keyword) { }
1040 
Error()1041     static NameClassification Error() {
1042       return NameClassification(NC_Error);
1043     }
1044 
Unknown()1045     static NameClassification Unknown() {
1046       return NameClassification(NC_Unknown);
1047     }
1048 
NestedNameSpecifier()1049     static NameClassification NestedNameSpecifier() {
1050       return NameClassification(NC_NestedNameSpecifier);
1051     }
1052 
TypeTemplate(TemplateName Name)1053     static NameClassification TypeTemplate(TemplateName Name) {
1054       NameClassification Result(NC_TypeTemplate);
1055       Result.Template = Name;
1056       return Result;
1057     }
1058 
FunctionTemplate(TemplateName Name)1059     static NameClassification FunctionTemplate(TemplateName Name) {
1060       NameClassification Result(NC_FunctionTemplate);
1061       Result.Template = Name;
1062       return Result;
1063     }
1064 
getKind()1065     NameClassificationKind getKind() const { return Kind; }
1066 
getType()1067     ParsedType getType() const {
1068       assert(Kind == NC_Type);
1069       return Type;
1070     }
1071 
getExpression()1072     ExprResult getExpression() const {
1073       assert(Kind == NC_Expression);
1074       return Expr;
1075     }
1076 
getTemplateName()1077     TemplateName getTemplateName() const {
1078       assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate);
1079       return Template;
1080     }
1081 
getTemplateNameKind()1082     TemplateNameKind getTemplateNameKind() const {
1083       assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate);
1084       return Kind == NC_TypeTemplate? TNK_Type_template : TNK_Function_template;
1085     }
1086 };
1087 
1088   /// \brief Perform name lookup on the given name, classifying it based on
1089   /// the results of name lookup and the following token.
1090   ///
1091   /// This routine is used by the parser to resolve identifiers and help direct
1092   /// parsing. When the identifier cannot be found, this routine will attempt
1093   /// to correct the typo and classify based on the resulting name.
1094   ///
1095   /// \param S The scope in which we're performing name lookup.
1096   ///
1097   /// \param SS The nested-name-specifier that precedes the name.
1098   ///
1099   /// \param Name The identifier. If typo correction finds an alternative name,
1100   /// this pointer parameter will be updated accordingly.
1101   ///
1102   /// \param NameLoc The location of the identifier.
1103   ///
1104   /// \param NextToken The token following the identifier. Used to help
1105   /// disambiguate the name.
1106   NameClassification ClassifyName(Scope *S,
1107                                   CXXScopeSpec &SS,
1108                                   IdentifierInfo *&Name,
1109                                   SourceLocation NameLoc,
1110                                   const Token &NextToken);
1111 
1112   Decl *ActOnDeclarator(Scope *S, Declarator &D);
1113 
1114   Decl *HandleDeclarator(Scope *S, Declarator &D,
1115                          MultiTemplateParamsArg TemplateParameterLists);
1116   void RegisterLocallyScopedExternCDecl(NamedDecl *ND,
1117                                         const LookupResult &Previous,
1118                                         Scope *S);
1119   bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
1120   bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
1121                                     DeclarationName Name,
1122                                     SourceLocation Loc);
1123   void DiagnoseFunctionSpecifiers(Declarator& D);
1124   void CheckShadow(Scope *S, VarDecl *D, const LookupResult& R);
1125   void CheckShadow(Scope *S, VarDecl *D);
1126   void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
1127   void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
1128   NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1129                                     TypeSourceInfo *TInfo,
1130                                     LookupResult &Previous);
1131   NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
1132                                   LookupResult &Previous, bool &Redeclaration);
1133   NamedDecl* ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1134                                      TypeSourceInfo *TInfo,
1135                                      LookupResult &Previous,
1136                                      MultiTemplateParamsArg TemplateParamLists);
1137   // Returns true if the variable declaration is a redeclaration
1138   bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
1139   void CheckCompleteVariableDeclaration(VarDecl *var);
1140   void ActOnStartFunctionDeclarator();
1141   void ActOnEndFunctionDeclarator();
1142   NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1143                                      TypeSourceInfo *TInfo,
1144                                      LookupResult &Previous,
1145                                      MultiTemplateParamsArg TemplateParamLists,
1146                                      bool &AddToScope);
1147   bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);
1148 
1149   bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
1150   bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);
1151 
1152   void DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);
1153   // Returns true if the function declaration is a redeclaration
1154   bool CheckFunctionDeclaration(Scope *S,
1155                                 FunctionDecl *NewFD, LookupResult &Previous,
1156                                 bool IsExplicitSpecialization);
1157   void CheckMain(FunctionDecl *FD, const DeclSpec &D);
1158   Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
1159   ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
1160                                           SourceLocation Loc,
1161                                           QualType T);
1162   ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
1163                               SourceLocation NameLoc, IdentifierInfo *Name,
1164                               QualType T, TypeSourceInfo *TSInfo,
1165                               StorageClass SC, StorageClass SCAsWritten);
1166   void ActOnParamDefaultArgument(Decl *param,
1167                                  SourceLocation EqualLoc,
1168                                  Expr *defarg);
1169   void ActOnParamUnparsedDefaultArgument(Decl *param,
1170                                          SourceLocation EqualLoc,
1171                                          SourceLocation ArgLoc);
1172   void ActOnParamDefaultArgumentError(Decl *param);
1173   bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
1174                                SourceLocation EqualLoc);
1175 
1176   void CheckSelfReference(Decl *OrigDecl, Expr *E);
1177   void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit,
1178                             bool TypeMayContainAuto);
1179   void ActOnUninitializedDecl(Decl *dcl, bool TypeMayContainAuto);
1180   void ActOnInitializerError(Decl *Dcl);
1181   void ActOnCXXForRangeDecl(Decl *D);
1182   void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
1183   void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
1184   void FinalizeDeclaration(Decl *D);
1185   DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
1186                                          Decl **Group,
1187                                          unsigned NumDecls);
1188   DeclGroupPtrTy BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
1189                                       bool TypeMayContainAuto = true);
1190   void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
1191                                        SourceLocation LocAfterDecls);
1192   void CheckForFunctionRedefinition(FunctionDecl *FD);
1193   Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D);
1194   Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D);
1195   void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
1196 
1197   void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
1198   Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
1199   Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
1200 
1201   /// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
1202   /// attribute for which parsing is delayed.
1203   void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);
1204 
1205   /// \brief Diagnose any unused parameters in the given sequence of
1206   /// ParmVarDecl pointers.
1207   void DiagnoseUnusedParameters(ParmVarDecl * const *Begin,
1208                                 ParmVarDecl * const *End);
1209 
1210   /// \brief Diagnose whether the size of parameters or return value of a
1211   /// function or obj-c method definition is pass-by-value and larger than a
1212   /// specified threshold.
1213   void DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Begin,
1214                                               ParmVarDecl * const *End,
1215                                               QualType ReturnTy,
1216                                               NamedDecl *D);
1217 
1218   void DiagnoseInvalidJumps(Stmt *Body);
1219   Decl *ActOnFileScopeAsmDecl(Expr *expr,
1220                               SourceLocation AsmLoc,
1221                               SourceLocation RParenLoc);
1222 
1223   /// \brief The parser has processed a module import declaration.
1224   ///
1225   /// \param AtLoc The location of the '@' symbol, if any.
1226   ///
1227   /// \param ImportLoc The location of the 'import' keyword.
1228   ///
1229   /// \param Path The module access path.
1230   DeclResult ActOnModuleImport(SourceLocation AtLoc, SourceLocation ImportLoc,
1231                                ModuleIdPath Path);
1232 
1233   /// \brief Retrieve a suitable printing policy.
getPrintingPolicy()1234   PrintingPolicy getPrintingPolicy() const {
1235     return getPrintingPolicy(Context, PP);
1236   }
1237 
1238   /// \brief Retrieve a suitable printing policy.
1239   static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
1240                                           const Preprocessor &PP);
1241 
1242   /// Scope actions.
1243   void ActOnPopScope(SourceLocation Loc, Scope *S);
1244   void ActOnTranslationUnitScope(Scope *S);
1245 
1246   Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
1247                                    DeclSpec &DS);
1248   Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
1249                                    DeclSpec &DS,
1250                                    MultiTemplateParamsArg TemplateParams);
1251 
1252   Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
1253                                     AccessSpecifier AS,
1254                                     RecordDecl *Record);
1255 
1256   Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
1257                                        RecordDecl *Record);
1258 
1259   bool isAcceptableTagRedeclaration(const TagDecl *Previous,
1260                                     TagTypeKind NewTag, bool isDefinition,
1261                                     SourceLocation NewTagLoc,
1262                                     const IdentifierInfo &Name);
1263 
1264   enum TagUseKind {
1265     TUK_Reference,   // Reference to a tag:  'struct foo *X;'
1266     TUK_Declaration, // Fwd decl of a tag:   'struct foo;'
1267     TUK_Definition,  // Definition of a tag: 'struct foo { int X; } Y;'
1268     TUK_Friend       // Friend declaration:  'friend struct foo;'
1269   };
1270 
1271   Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
1272                  SourceLocation KWLoc, CXXScopeSpec &SS,
1273                  IdentifierInfo *Name, SourceLocation NameLoc,
1274                  AttributeList *Attr, AccessSpecifier AS,
1275                  SourceLocation ModulePrivateLoc,
1276                  MultiTemplateParamsArg TemplateParameterLists,
1277                  bool &OwnedDecl, bool &IsDependent,
1278                  SourceLocation ScopedEnumKWLoc,
1279                  bool ScopedEnumUsesClassTag, TypeResult UnderlyingType);
1280 
1281   Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
1282                                 unsigned TagSpec, SourceLocation TagLoc,
1283                                 CXXScopeSpec &SS,
1284                                 IdentifierInfo *Name, SourceLocation NameLoc,
1285                                 AttributeList *Attr,
1286                                 MultiTemplateParamsArg TempParamLists);
1287 
1288   TypeResult ActOnDependentTag(Scope *S,
1289                                unsigned TagSpec,
1290                                TagUseKind TUK,
1291                                const CXXScopeSpec &SS,
1292                                IdentifierInfo *Name,
1293                                SourceLocation TagLoc,
1294                                SourceLocation NameLoc);
1295 
1296   void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
1297                  IdentifierInfo *ClassName,
1298                  SmallVectorImpl<Decl *> &Decls);
1299   Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
1300                    Declarator &D, Expr *BitfieldWidth);
1301 
1302   FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
1303                          Declarator &D, Expr *BitfieldWidth, bool HasInit,
1304                          AccessSpecifier AS);
1305 
1306   FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
1307                             TypeSourceInfo *TInfo,
1308                             RecordDecl *Record, SourceLocation Loc,
1309                             bool Mutable, Expr *BitfieldWidth, bool HasInit,
1310                             SourceLocation TSSL,
1311                             AccessSpecifier AS, NamedDecl *PrevDecl,
1312                             Declarator *D = 0);
1313 
1314   enum CXXSpecialMember {
1315     CXXDefaultConstructor,
1316     CXXCopyConstructor,
1317     CXXMoveConstructor,
1318     CXXCopyAssignment,
1319     CXXMoveAssignment,
1320     CXXDestructor,
1321     CXXInvalid
1322   };
1323   bool CheckNontrivialField(FieldDecl *FD);
1324   void DiagnoseNontrivial(const RecordType* Record, CXXSpecialMember mem);
1325   CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
1326   void ActOnLastBitfield(SourceLocation DeclStart,
1327                          SmallVectorImpl<Decl *> &AllIvarDecls);
1328   Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
1329                   Declarator &D, Expr *BitfieldWidth,
1330                   tok::ObjCKeywordKind visibility);
1331 
1332   // This is used for both record definitions and ObjC interface declarations.
1333   void ActOnFields(Scope* S, SourceLocation RecLoc, Decl *TagDecl,
1334                    llvm::ArrayRef<Decl *> Fields,
1335                    SourceLocation LBrac, SourceLocation RBrac,
1336                    AttributeList *AttrList);
1337 
1338   /// ActOnTagStartDefinition - Invoked when we have entered the
1339   /// scope of a tag's definition (e.g., for an enumeration, class,
1340   /// struct, or union).
1341   void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);
1342 
1343   Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);
1344 
1345   /// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
1346   /// C++ record definition's base-specifiers clause and are starting its
1347   /// member declarations.
1348   void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
1349                                        SourceLocation FinalLoc,
1350                                        SourceLocation LBraceLoc);
1351 
1352   /// ActOnTagFinishDefinition - Invoked once we have finished parsing
1353   /// the definition of a tag (enumeration, class, struct, or union).
1354   void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
1355                                 SourceLocation RBraceLoc);
1356 
1357   void ActOnObjCContainerFinishDefinition();
1358 
1359   /// \brief Invoked when we must temporarily exit the objective-c container
1360   /// scope for parsing/looking-up C constructs.
1361   ///
1362   /// Must be followed by a call to \see ActOnObjCReenterContainerContext
1363   void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
1364   void ActOnObjCReenterContainerContext(DeclContext *DC);
1365 
1366   /// ActOnTagDefinitionError - Invoked when there was an unrecoverable
1367   /// error parsing the definition of a tag.
1368   void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);
1369 
1370   EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
1371                                       EnumConstantDecl *LastEnumConst,
1372                                       SourceLocation IdLoc,
1373                                       IdentifierInfo *Id,
1374                                       Expr *val);
1375   bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
1376   bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
1377                               QualType EnumUnderlyingTy, const EnumDecl *Prev);
1378 
1379   Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
1380                           SourceLocation IdLoc, IdentifierInfo *Id,
1381                           AttributeList *Attrs,
1382                           SourceLocation EqualLoc, Expr *Val);
1383   void ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
1384                      SourceLocation RBraceLoc, Decl *EnumDecl,
1385                      Decl **Elements, unsigned NumElements,
1386                      Scope *S, AttributeList *Attr);
1387 
1388   DeclContext *getContainingDC(DeclContext *DC);
1389 
1390   /// Set the current declaration context until it gets popped.
1391   void PushDeclContext(Scope *S, DeclContext *DC);
1392   void PopDeclContext();
1393 
1394   /// EnterDeclaratorContext - Used when we must lookup names in the context
1395   /// of a declarator's nested name specifier.
1396   void EnterDeclaratorContext(Scope *S, DeclContext *DC);
1397   void ExitDeclaratorContext(Scope *S);
1398 
1399   /// Push the parameters of D, which must be a function, into scope.
1400   void ActOnReenterFunctionContext(Scope* S, Decl* D);
1401   void ActOnExitFunctionContext();
1402 
1403   DeclContext *getFunctionLevelDeclContext();
1404 
1405   /// getCurFunctionDecl - If inside of a function body, this returns a pointer
1406   /// to the function decl for the function being parsed.  If we're currently
1407   /// in a 'block', this returns the containing context.
1408   FunctionDecl *getCurFunctionDecl();
1409 
1410   /// getCurMethodDecl - If inside of a method body, this returns a pointer to
1411   /// the method decl for the method being parsed.  If we're currently
1412   /// in a 'block', this returns the containing context.
1413   ObjCMethodDecl *getCurMethodDecl();
1414 
1415   /// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
1416   /// or C function we're in, otherwise return null.  If we're currently
1417   /// in a 'block', this returns the containing context.
1418   NamedDecl *getCurFunctionOrMethodDecl();
1419 
1420   /// Add this decl to the scope shadowed decl chains.
1421   void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);
1422 
1423   /// \brief Make the given externally-produced declaration visible at the
1424   /// top level scope.
1425   ///
1426   /// \param D The externally-produced declaration to push.
1427   ///
1428   /// \param Name The name of the externally-produced declaration.
1429   void pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name);
1430 
1431   /// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
1432   /// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
1433   /// true if 'D' belongs to the given declaration context.
1434   ///
1435   /// \param ExplicitInstantiationOrSpecialization When true, we are checking
1436   /// whether the declaration is in scope for the purposes of explicit template
1437   /// instantiation or specialization. The default is false.
1438   bool isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S = 0,
1439                      bool ExplicitInstantiationOrSpecialization = false);
1440 
1441   /// Finds the scope corresponding to the given decl context, if it
1442   /// happens to be an enclosing scope.  Otherwise return NULL.
1443   static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);
1444 
1445   /// Subroutines of ActOnDeclarator().
1446   TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
1447                                 TypeSourceInfo *TInfo);
1448   bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);
1449   void mergeDeclAttributes(Decl *New, Decl *Old, bool MergeDeprecation = true);
1450   void MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls);
1451   bool MergeFunctionDecl(FunctionDecl *New, Decl *Old, Scope *S);
1452   bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
1453                                     Scope *S);
1454   void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
1455   void MergeVarDecl(VarDecl *New, LookupResult &OldDecls);
1456   void MergeVarDeclTypes(VarDecl *New, VarDecl *Old);
1457   void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
1458   bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);
1459 
1460   // AssignmentAction - This is used by all the assignment diagnostic functions
1461   // to represent what is actually causing the operation
1462   enum AssignmentAction {
1463     AA_Assigning,
1464     AA_Passing,
1465     AA_Returning,
1466     AA_Converting,
1467     AA_Initializing,
1468     AA_Sending,
1469     AA_Casting
1470   };
1471 
1472   /// C++ Overloading.
1473   enum OverloadKind {
1474     /// This is a legitimate overload: the existing declarations are
1475     /// functions or function templates with different signatures.
1476     Ovl_Overload,
1477 
1478     /// This is not an overload because the signature exactly matches
1479     /// an existing declaration.
1480     Ovl_Match,
1481 
1482     /// This is not an overload because the lookup results contain a
1483     /// non-function.
1484     Ovl_NonFunction
1485   };
1486   OverloadKind CheckOverload(Scope *S,
1487                              FunctionDecl *New,
1488                              const LookupResult &OldDecls,
1489                              NamedDecl *&OldDecl,
1490                              bool IsForUsingDecl);
1491   bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl);
1492 
1493   /// \brief Checks availability of the function depending on the current
1494   /// function context.Inside an unavailable function,unavailability is ignored.
1495   ///
1496   /// \returns true if \arg FD is unavailable and current context is inside
1497   /// an available function, false otherwise.
1498   bool isFunctionConsideredUnavailable(FunctionDecl *FD);
1499 
1500   ImplicitConversionSequence
1501   TryImplicitConversion(Expr *From, QualType ToType,
1502                         bool SuppressUserConversions,
1503                         bool AllowExplicit,
1504                         bool InOverloadResolution,
1505                         bool CStyle,
1506                         bool AllowObjCWritebackConversion);
1507 
1508   bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
1509   bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
1510   bool IsComplexPromotion(QualType FromType, QualType ToType);
1511   bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
1512                            bool InOverloadResolution,
1513                            QualType& ConvertedType, bool &IncompatibleObjC);
1514   bool isObjCPointerConversion(QualType FromType, QualType ToType,
1515                                QualType& ConvertedType, bool &IncompatibleObjC);
1516   bool isObjCWritebackConversion(QualType FromType, QualType ToType,
1517                                  QualType &ConvertedType);
1518   bool IsBlockPointerConversion(QualType FromType, QualType ToType,
1519                                 QualType& ConvertedType);
1520   bool FunctionArgTypesAreEqual(const FunctionProtoType *OldType,
1521                                 const FunctionProtoType *NewType,
1522                                 unsigned *ArgPos = 0);
1523   void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
1524                                   QualType FromType, QualType ToType);
1525 
1526   CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
1527   bool CheckPointerConversion(Expr *From, QualType ToType,
1528                               CastKind &Kind,
1529                               CXXCastPath& BasePath,
1530                               bool IgnoreBaseAccess);
1531   bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
1532                                  bool InOverloadResolution,
1533                                  QualType &ConvertedType);
1534   bool CheckMemberPointerConversion(Expr *From, QualType ToType,
1535                                     CastKind &Kind,
1536                                     CXXCastPath &BasePath,
1537                                     bool IgnoreBaseAccess);
1538   bool IsQualificationConversion(QualType FromType, QualType ToType,
1539                                  bool CStyle, bool &ObjCLifetimeConversion);
1540   bool IsNoReturnConversion(QualType FromType, QualType ToType,
1541                             QualType &ResultTy);
1542   bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
1543 
1544 
1545   ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
1546                                              const VarDecl *NRVOCandidate,
1547                                              QualType ResultType,
1548                                              Expr *Value,
1549                                              bool AllowNRVO = true);
1550 
1551   bool CanPerformCopyInitialization(const InitializedEntity &Entity,
1552                                     ExprResult Init);
1553   ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
1554                                        SourceLocation EqualLoc,
1555                                        ExprResult Init,
1556                                        bool TopLevelOfInitList = false,
1557                                        bool AllowExplicit = false);
1558   ExprResult PerformObjectArgumentInitialization(Expr *From,
1559                                                  NestedNameSpecifier *Qualifier,
1560                                                  NamedDecl *FoundDecl,
1561                                                  CXXMethodDecl *Method);
1562 
1563   ExprResult PerformContextuallyConvertToBool(Expr *From);
1564   ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);
1565 
1566   /// Contexts in which a converted constant expression is required.
1567   enum CCEKind {
1568     CCEK_CaseValue,  ///< Expression in a case label.
1569     CCEK_Enumerator, ///< Enumerator value with fixed underlying type.
1570     CCEK_TemplateArg ///< Value of a non-type template parameter.
1571   };
1572   ExprResult CheckConvertedConstantExpression(Expr *From, QualType T,
1573                                               llvm::APSInt &Value, CCEKind CCE);
1574 
1575   ExprResult
1576   ConvertToIntegralOrEnumerationType(SourceLocation Loc, Expr *FromE,
1577                                      const PartialDiagnostic &NotIntDiag,
1578                                      const PartialDiagnostic &IncompleteDiag,
1579                                      const PartialDiagnostic &ExplicitConvDiag,
1580                                      const PartialDiagnostic &ExplicitConvNote,
1581                                      const PartialDiagnostic &AmbigDiag,
1582                                      const PartialDiagnostic &AmbigNote,
1583                                      const PartialDiagnostic &ConvDiag,
1584                                      bool AllowScopedEnumerations);
1585   enum ObjCSubscriptKind {
1586     OS_Array,
1587     OS_Dictionary,
1588     OS_Error
1589   };
1590   ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);
1591 
1592   ExprResult PerformObjectMemberConversion(Expr *From,
1593                                            NestedNameSpecifier *Qualifier,
1594                                            NamedDecl *FoundDecl,
1595                                            NamedDecl *Member);
1596 
1597   // Members have to be NamespaceDecl* or TranslationUnitDecl*.
1598   // TODO: make this is a typesafe union.
1599   typedef llvm::SmallPtrSet<DeclContext   *, 16> AssociatedNamespaceSet;
1600   typedef llvm::SmallPtrSet<CXXRecordDecl *, 16> AssociatedClassSet;
1601 
1602   void AddOverloadCandidate(FunctionDecl *Function,
1603                             DeclAccessPair FoundDecl,
1604                             llvm::ArrayRef<Expr *> Args,
1605                             OverloadCandidateSet& CandidateSet,
1606                             bool SuppressUserConversions = false,
1607                             bool PartialOverloading = false,
1608                             bool AllowExplicit = false);
1609   void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
1610                              llvm::ArrayRef<Expr *> Args,
1611                              OverloadCandidateSet& CandidateSet,
1612                              bool SuppressUserConversions = false,
1613                             TemplateArgumentListInfo *ExplicitTemplateArgs = 0);
1614   void AddMethodCandidate(DeclAccessPair FoundDecl,
1615                           QualType ObjectType,
1616                           Expr::Classification ObjectClassification,
1617                           Expr **Args, unsigned NumArgs,
1618                           OverloadCandidateSet& CandidateSet,
1619                           bool SuppressUserConversion = false);
1620   void AddMethodCandidate(CXXMethodDecl *Method,
1621                           DeclAccessPair FoundDecl,
1622                           CXXRecordDecl *ActingContext, QualType ObjectType,
1623                           Expr::Classification ObjectClassification,
1624                           llvm::ArrayRef<Expr *> Args,
1625                           OverloadCandidateSet& CandidateSet,
1626                           bool SuppressUserConversions = false);
1627   void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
1628                                   DeclAccessPair FoundDecl,
1629                                   CXXRecordDecl *ActingContext,
1630                                  TemplateArgumentListInfo *ExplicitTemplateArgs,
1631                                   QualType ObjectType,
1632                                   Expr::Classification ObjectClassification,
1633                                   llvm::ArrayRef<Expr *> Args,
1634                                   OverloadCandidateSet& CandidateSet,
1635                                   bool SuppressUserConversions = false);
1636   void AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
1637                                     DeclAccessPair FoundDecl,
1638                                  TemplateArgumentListInfo *ExplicitTemplateArgs,
1639                                     llvm::ArrayRef<Expr *> Args,
1640                                     OverloadCandidateSet& CandidateSet,
1641                                     bool SuppressUserConversions = false);
1642   void AddConversionCandidate(CXXConversionDecl *Conversion,
1643                               DeclAccessPair FoundDecl,
1644                               CXXRecordDecl *ActingContext,
1645                               Expr *From, QualType ToType,
1646                               OverloadCandidateSet& CandidateSet);
1647   void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
1648                                       DeclAccessPair FoundDecl,
1649                                       CXXRecordDecl *ActingContext,
1650                                       Expr *From, QualType ToType,
1651                                       OverloadCandidateSet &CandidateSet);
1652   void AddSurrogateCandidate(CXXConversionDecl *Conversion,
1653                              DeclAccessPair FoundDecl,
1654                              CXXRecordDecl *ActingContext,
1655                              const FunctionProtoType *Proto,
1656                              Expr *Object, llvm::ArrayRef<Expr*> Args,
1657                              OverloadCandidateSet& CandidateSet);
1658   void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
1659                                    SourceLocation OpLoc,
1660                                    Expr **Args, unsigned NumArgs,
1661                                    OverloadCandidateSet& CandidateSet,
1662                                    SourceRange OpRange = SourceRange());
1663   void AddBuiltinCandidate(QualType ResultTy, QualType *ParamTys,
1664                            Expr **Args, unsigned NumArgs,
1665                            OverloadCandidateSet& CandidateSet,
1666                            bool IsAssignmentOperator = false,
1667                            unsigned NumContextualBoolArguments = 0);
1668   void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
1669                                     SourceLocation OpLoc,
1670                                     Expr **Args, unsigned NumArgs,
1671                                     OverloadCandidateSet& CandidateSet);
1672   void AddArgumentDependentLookupCandidates(DeclarationName Name,
1673                                             bool Operator, SourceLocation Loc,
1674                                             llvm::ArrayRef<Expr *> Args,
1675                                 TemplateArgumentListInfo *ExplicitTemplateArgs,
1676                                             OverloadCandidateSet& CandidateSet,
1677                                             bool PartialOverloading = false,
1678                                         bool StdNamespaceIsAssociated = false);
1679 
1680   // Emit as a 'note' the specific overload candidate
1681   void NoteOverloadCandidate(FunctionDecl *Fn, QualType DestType = QualType());
1682 
1683   // Emit as a series of 'note's all template and non-templates
1684   // identified by the expression Expr
1685   void NoteAllOverloadCandidates(Expr* E, QualType DestType = QualType());
1686 
1687   // [PossiblyAFunctionType]  -->   [Return]
1688   // NonFunctionType --> NonFunctionType
1689   // R (A) --> R(A)
1690   // R (*)(A) --> R (A)
1691   // R (&)(A) --> R (A)
1692   // R (S::*)(A) --> R (A)
1693   QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);
1694 
1695   FunctionDecl *
1696   ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
1697                                      QualType TargetType,
1698                                      bool Complain,
1699                                      DeclAccessPair &Found,
1700                                      bool *pHadMultipleCandidates = 0);
1701 
1702   FunctionDecl *ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
1703                                                    bool Complain = false,
1704                                                    DeclAccessPair* Found = 0);
1705 
1706   bool ResolveAndFixSingleFunctionTemplateSpecialization(
1707                       ExprResult &SrcExpr,
1708                       bool DoFunctionPointerConverion = false,
1709                       bool Complain = false,
1710                       const SourceRange& OpRangeForComplaining = SourceRange(),
1711                       QualType DestTypeForComplaining = QualType(),
1712                       unsigned DiagIDForComplaining = 0);
1713 
1714 
1715   Expr *FixOverloadedFunctionReference(Expr *E,
1716                                        DeclAccessPair FoundDecl,
1717                                        FunctionDecl *Fn);
1718   ExprResult FixOverloadedFunctionReference(ExprResult,
1719                                             DeclAccessPair FoundDecl,
1720                                             FunctionDecl *Fn);
1721 
1722   void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
1723                                    llvm::ArrayRef<Expr *> Args,
1724                                    OverloadCandidateSet &CandidateSet,
1725                                    bool PartialOverloading = false);
1726 
1727   ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
1728                                      UnresolvedLookupExpr *ULE,
1729                                      SourceLocation LParenLoc,
1730                                      Expr **Args, unsigned NumArgs,
1731                                      SourceLocation RParenLoc,
1732                                      Expr *ExecConfig,
1733                                      bool AllowTypoCorrection=true);
1734 
1735   ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
1736                                      unsigned Opc,
1737                                      const UnresolvedSetImpl &Fns,
1738                                      Expr *input);
1739 
1740   ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
1741                                    unsigned Opc,
1742                                    const UnresolvedSetImpl &Fns,
1743                                    Expr *LHS, Expr *RHS);
1744 
1745   ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
1746                                                 SourceLocation RLoc,
1747                                                 Expr *Base,Expr *Idx);
1748 
1749   ExprResult
1750   BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
1751                             SourceLocation LParenLoc, Expr **Args,
1752                             unsigned NumArgs, SourceLocation RParenLoc);
1753   ExprResult
1754   BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
1755                                Expr **Args, unsigned NumArgs,
1756                                SourceLocation RParenLoc);
1757 
1758   ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
1759                                       SourceLocation OpLoc);
1760 
1761   /// CheckCallReturnType - Checks that a call expression's return type is
1762   /// complete. Returns true on failure. The location passed in is the location
1763   /// that best represents the call.
1764   bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
1765                            CallExpr *CE, FunctionDecl *FD);
1766 
1767   /// Helpers for dealing with blocks and functions.
1768   bool CheckParmsForFunctionDef(ParmVarDecl **Param, ParmVarDecl **ParamEnd,
1769                                 bool CheckParameterNames);
1770   void CheckCXXDefaultArguments(FunctionDecl *FD);
1771   void CheckExtraCXXDefaultArguments(Declarator &D);
1772   Scope *getNonFieldDeclScope(Scope *S);
1773 
1774   /// \name Name lookup
1775   ///
1776   /// These routines provide name lookup that is used during semantic
1777   /// analysis to resolve the various kinds of names (identifiers,
1778   /// overloaded operator names, constructor names, etc.) into zero or
1779   /// more declarations within a particular scope. The major entry
1780   /// points are LookupName, which performs unqualified name lookup,
1781   /// and LookupQualifiedName, which performs qualified name lookup.
1782   ///
1783   /// All name lookup is performed based on some specific criteria,
1784   /// which specify what names will be visible to name lookup and how
1785   /// far name lookup should work. These criteria are important both
1786   /// for capturing language semantics (certain lookups will ignore
1787   /// certain names, for example) and for performance, since name
1788   /// lookup is often a bottleneck in the compilation of C++. Name
1789   /// lookup criteria is specified via the LookupCriteria enumeration.
1790   ///
1791   /// The results of name lookup can vary based on the kind of name
1792   /// lookup performed, the current language, and the translation
1793   /// unit. In C, for example, name lookup will either return nothing
1794   /// (no entity found) or a single declaration. In C++, name lookup
1795   /// can additionally refer to a set of overloaded functions or
1796   /// result in an ambiguity. All of the possible results of name
1797   /// lookup are captured by the LookupResult class, which provides
1798   /// the ability to distinguish among them.
1799   //@{
1800 
1801   /// @brief Describes the kind of name lookup to perform.
1802   enum LookupNameKind {
1803     /// Ordinary name lookup, which finds ordinary names (functions,
1804     /// variables, typedefs, etc.) in C and most kinds of names
1805     /// (functions, variables, members, types, etc.) in C++.
1806     LookupOrdinaryName = 0,
1807     /// Tag name lookup, which finds the names of enums, classes,
1808     /// structs, and unions.
1809     LookupTagName,
1810     /// Label name lookup.
1811     LookupLabel,
1812     /// Member name lookup, which finds the names of
1813     /// class/struct/union members.
1814     LookupMemberName,
1815     /// Look up of an operator name (e.g., operator+) for use with
1816     /// operator overloading. This lookup is similar to ordinary name
1817     /// lookup, but will ignore any declarations that are class members.
1818     LookupOperatorName,
1819     /// Look up of a name that precedes the '::' scope resolution
1820     /// operator in C++. This lookup completely ignores operator, object,
1821     /// function, and enumerator names (C++ [basic.lookup.qual]p1).
1822     LookupNestedNameSpecifierName,
1823     /// Look up a namespace name within a C++ using directive or
1824     /// namespace alias definition, ignoring non-namespace names (C++
1825     /// [basic.lookup.udir]p1).
1826     LookupNamespaceName,
1827     /// Look up all declarations in a scope with the given name,
1828     /// including resolved using declarations.  This is appropriate
1829     /// for checking redeclarations for a using declaration.
1830     LookupUsingDeclName,
1831     /// Look up an ordinary name that is going to be redeclared as a
1832     /// name with linkage. This lookup ignores any declarations that
1833     /// are outside of the current scope unless they have linkage. See
1834     /// C99 6.2.2p4-5 and C++ [basic.link]p6.
1835     LookupRedeclarationWithLinkage,
1836     /// Look up the name of an Objective-C protocol.
1837     LookupObjCProtocolName,
1838     /// Look up implicit 'self' parameter of an objective-c method.
1839     LookupObjCImplicitSelfParam,
1840     /// \brief Look up any declaration with any name.
1841     LookupAnyName
1842   };
1843 
1844   /// \brief Specifies whether (or how) name lookup is being performed for a
1845   /// redeclaration (vs. a reference).
1846   enum RedeclarationKind {
1847     /// \brief The lookup is a reference to this name that is not for the
1848     /// purpose of redeclaring the name.
1849     NotForRedeclaration = 0,
1850     /// \brief The lookup results will be used for redeclaration of a name,
1851     /// if an entity by that name already exists.
1852     ForRedeclaration
1853   };
1854 
1855   /// \brief The possible outcomes of name lookup for a literal operator.
1856   enum LiteralOperatorLookupResult {
1857     /// \brief The lookup resulted in an error.
1858     LOLR_Error,
1859     /// \brief The lookup found a single 'cooked' literal operator, which
1860     /// expects a normal literal to be built and passed to it.
1861     LOLR_Cooked,
1862     /// \brief The lookup found a single 'raw' literal operator, which expects
1863     /// a string literal containing the spelling of the literal token.
1864     LOLR_Raw,
1865     /// \brief The lookup found an overload set of literal operator templates,
1866     /// which expect the characters of the spelling of the literal token to be
1867     /// passed as a non-type template argument pack.
1868     LOLR_Template
1869   };
1870 
1871   SpecialMemberOverloadResult *LookupSpecialMember(CXXRecordDecl *D,
1872                                                    CXXSpecialMember SM,
1873                                                    bool ConstArg,
1874                                                    bool VolatileArg,
1875                                                    bool RValueThis,
1876                                                    bool ConstThis,
1877                                                    bool VolatileThis);
1878 
1879 private:
1880   bool CppLookupName(LookupResult &R, Scope *S);
1881 
1882   // \brief The set of known/encountered (unique, canonicalized) NamespaceDecls.
1883   //
1884   // The boolean value will be true to indicate that the namespace was loaded
1885   // from an AST/PCH file, or false otherwise.
1886   llvm::DenseMap<NamespaceDecl*, bool> KnownNamespaces;
1887 
1888   /// \brief Whether we have already loaded known namespaces from an extenal
1889   /// source.
1890   bool LoadedExternalKnownNamespaces;
1891 
1892 public:
1893   /// \brief Look up a name, looking for a single declaration.  Return
1894   /// null if the results were absent, ambiguous, or overloaded.
1895   ///
1896   /// It is preferable to use the elaborated form and explicitly handle
1897   /// ambiguity and overloaded.
1898   NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
1899                               SourceLocation Loc,
1900                               LookupNameKind NameKind,
1901                               RedeclarationKind Redecl
1902                                 = NotForRedeclaration);
1903   bool LookupName(LookupResult &R, Scope *S,
1904                   bool AllowBuiltinCreation = false);
1905   bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
1906                            bool InUnqualifiedLookup = false);
1907   bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
1908                         bool AllowBuiltinCreation = false,
1909                         bool EnteringContext = false);
1910   ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
1911                                    RedeclarationKind Redecl
1912                                      = NotForRedeclaration);
1913 
1914   void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
1915                                     QualType T1, QualType T2,
1916                                     UnresolvedSetImpl &Functions);
1917 
1918   LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
1919                                  SourceLocation GnuLabelLoc = SourceLocation());
1920 
1921   DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
1922   CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
1923   CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
1924                                                unsigned Quals,
1925                                                bool *ConstParam = 0);
1926   CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
1927                                          bool RValueThis, unsigned ThisQuals,
1928                                          bool *ConstParam = 0);
1929   CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class);
1930   CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, bool RValueThis,
1931                                         unsigned ThisQuals);
1932   CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);
1933 
1934   LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
1935                                                     ArrayRef<QualType> ArgTys,
1936                                                     bool AllowRawAndTemplate);
1937 
1938   void ArgumentDependentLookup(DeclarationName Name, bool Operator,
1939                                SourceLocation Loc,
1940                                llvm::ArrayRef<Expr *> Args,
1941                                ADLResult &Functions,
1942                                bool StdNamespaceIsAssociated = false);
1943 
1944   void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
1945                           VisibleDeclConsumer &Consumer,
1946                           bool IncludeGlobalScope = true);
1947   void LookupVisibleDecls(DeclContext *Ctx, LookupNameKind Kind,
1948                           VisibleDeclConsumer &Consumer,
1949                           bool IncludeGlobalScope = true);
1950 
1951   TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
1952                              Sema::LookupNameKind LookupKind,
1953                              Scope *S, CXXScopeSpec *SS,
1954                              CorrectionCandidateCallback &CCC,
1955                              DeclContext *MemberContext = 0,
1956                              bool EnteringContext = false,
1957                              const ObjCObjectPointerType *OPT = 0);
1958 
1959   void FindAssociatedClassesAndNamespaces(llvm::ArrayRef<Expr *> Args,
1960                                    AssociatedNamespaceSet &AssociatedNamespaces,
1961                                    AssociatedClassSet &AssociatedClasses);
1962 
1963   void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
1964                             bool ConsiderLinkage,
1965                             bool ExplicitInstantiationOrSpecialization);
1966 
1967   bool DiagnoseAmbiguousLookup(LookupResult &Result);
1968   //@}
1969 
1970   ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
1971                                           SourceLocation IdLoc,
1972                                           bool TypoCorrection = false);
1973   NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
1974                                  Scope *S, bool ForRedeclaration,
1975                                  SourceLocation Loc);
1976   NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
1977                                       Scope *S);
1978   void AddKnownFunctionAttributes(FunctionDecl *FD);
1979 
1980   // More parsing and symbol table subroutines.
1981 
1982   // Decl attributes - this routine is the top level dispatcher.
1983   void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD,
1984                            bool NonInheritable = true, bool Inheritable = true);
1985   void ProcessDeclAttributeList(Scope *S, Decl *D, const AttributeList *AL,
1986                            bool NonInheritable = true, bool Inheritable = true);
1987   bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
1988                                       const AttributeList *AttrList);
1989 
1990   void checkUnusedDeclAttributes(Declarator &D);
1991 
1992   bool CheckRegparmAttr(const AttributeList &attr, unsigned &value);
1993   bool CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC);
1994   bool CheckNoReturnAttr(const AttributeList &attr);
1995 
1996   /// \brief Stmt attributes - this routine is the top level dispatcher.
1997   StmtResult ProcessStmtAttributes(Stmt *Stmt, AttributeList *Attrs,
1998                                    SourceRange Range);
1999 
2000   void WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
2001                            bool &IncompleteImpl, unsigned DiagID);
2002   void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
2003                                    ObjCMethodDecl *MethodDecl,
2004                                    bool IsProtocolMethodDecl);
2005 
2006   void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
2007                                    ObjCMethodDecl *Overridden,
2008                                    bool IsProtocolMethodDecl);
2009 
2010   /// WarnExactTypedMethods - This routine issues a warning if method
2011   /// implementation declaration matches exactly that of its declaration.
2012   void WarnExactTypedMethods(ObjCMethodDecl *Method,
2013                              ObjCMethodDecl *MethodDecl,
2014                              bool IsProtocolMethodDecl);
2015 
2016   bool isPropertyReadonly(ObjCPropertyDecl *PropertyDecl,
2017                           ObjCInterfaceDecl *IDecl);
2018 
2019   typedef llvm::DenseSet<Selector, llvm::DenseMapInfo<Selector> > SelectorSet;
2020   typedef llvm::DenseMap<Selector, ObjCMethodDecl*> ProtocolsMethodsMap;
2021 
2022   /// CheckProtocolMethodDefs - This routine checks unimplemented
2023   /// methods declared in protocol, and those referenced by it.
2024   /// \param IDecl - Used for checking for methods which may have been
2025   /// inherited.
2026   void CheckProtocolMethodDefs(SourceLocation ImpLoc,
2027                                ObjCProtocolDecl *PDecl,
2028                                bool& IncompleteImpl,
2029                                const SelectorSet &InsMap,
2030                                const SelectorSet &ClsMap,
2031                                ObjCContainerDecl *CDecl);
2032 
2033   /// CheckImplementationIvars - This routine checks if the instance variables
2034   /// listed in the implelementation match those listed in the interface.
2035   void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
2036                                 ObjCIvarDecl **Fields, unsigned nIvars,
2037                                 SourceLocation Loc);
2038 
2039   /// ImplMethodsVsClassMethods - This is main routine to warn if any method
2040   /// remains unimplemented in the class or category @implementation.
2041   void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
2042                                  ObjCContainerDecl* IDecl,
2043                                  bool IncompleteImpl = false);
2044 
2045   /// DiagnoseUnimplementedProperties - This routine warns on those properties
2046   /// which must be implemented by this implementation.
2047   void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
2048                                        ObjCContainerDecl *CDecl,
2049                                        const SelectorSet &InsMap);
2050 
2051   /// DefaultSynthesizeProperties - This routine default synthesizes all
2052   /// properties which must be synthesized in class's @implementation.
2053   void DefaultSynthesizeProperties (Scope *S, ObjCImplDecl* IMPDecl,
2054                                     ObjCInterfaceDecl *IDecl);
2055   void DefaultSynthesizeProperties(Scope *S, Decl *D);
2056 
2057   /// CollectImmediateProperties - This routine collects all properties in
2058   /// the class and its conforming protocols; but not those it its super class.
2059   void CollectImmediateProperties(ObjCContainerDecl *CDecl,
2060             llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& PropMap,
2061             llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& SuperPropMap);
2062 
2063 
2064   /// LookupPropertyDecl - Looks up a property in the current class and all
2065   /// its protocols.
2066   ObjCPropertyDecl *LookupPropertyDecl(const ObjCContainerDecl *CDecl,
2067                                        IdentifierInfo *II);
2068 
2069   /// Called by ActOnProperty to handle @property declarations in
2070   ////  class extensions.
2071   Decl *HandlePropertyInClassExtension(Scope *S,
2072                                        SourceLocation AtLoc,
2073                                        SourceLocation LParenLoc,
2074                                        FieldDeclarator &FD,
2075                                        Selector GetterSel,
2076                                        Selector SetterSel,
2077                                        const bool isAssign,
2078                                        const bool isReadWrite,
2079                                        const unsigned Attributes,
2080                                        const unsigned AttributesAsWritten,
2081                                        bool *isOverridingProperty,
2082                                        TypeSourceInfo *T,
2083                                        tok::ObjCKeywordKind MethodImplKind);
2084 
2085   /// Called by ActOnProperty and HandlePropertyInClassExtension to
2086   ///  handle creating the ObjcPropertyDecl for a category or @interface.
2087   ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
2088                                        ObjCContainerDecl *CDecl,
2089                                        SourceLocation AtLoc,
2090                                        SourceLocation LParenLoc,
2091                                        FieldDeclarator &FD,
2092                                        Selector GetterSel,
2093                                        Selector SetterSel,
2094                                        const bool isAssign,
2095                                        const bool isReadWrite,
2096                                        const unsigned Attributes,
2097                                        const unsigned AttributesAsWritten,
2098                                        TypeSourceInfo *T,
2099                                        tok::ObjCKeywordKind MethodImplKind,
2100                                        DeclContext *lexicalDC = 0);
2101 
2102   /// AtomicPropertySetterGetterRules - This routine enforces the rule (via
2103   /// warning) when atomic property has one but not the other user-declared
2104   /// setter or getter.
2105   void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
2106                                        ObjCContainerDecl* IDecl);
2107 
2108   void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);
2109 
2110   void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);
2111 
2112   enum MethodMatchStrategy {
2113     MMS_loose,
2114     MMS_strict
2115   };
2116 
2117   /// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
2118   /// true, or false, accordingly.
2119   bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
2120                                   const ObjCMethodDecl *PrevMethod,
2121                                   MethodMatchStrategy strategy = MMS_strict);
2122 
2123   /// MatchAllMethodDeclarations - Check methods declaraed in interface or
2124   /// or protocol against those declared in their implementations.
2125   void MatchAllMethodDeclarations(const SelectorSet &InsMap,
2126                                   const SelectorSet &ClsMap,
2127                                   SelectorSet &InsMapSeen,
2128                                   SelectorSet &ClsMapSeen,
2129                                   ObjCImplDecl* IMPDecl,
2130                                   ObjCContainerDecl* IDecl,
2131                                   bool &IncompleteImpl,
2132                                   bool ImmediateClass,
2133                                   bool WarnCategoryMethodImpl=false);
2134 
2135   /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
2136   /// category matches with those implemented in its primary class and
2137   /// warns each time an exact match is found.
2138   void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);
2139 
2140   /// \brief Add the given method to the list of globally-known methods.
2141   void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);
2142 
2143 private:
2144   /// AddMethodToGlobalPool - Add an instance or factory method to the global
2145   /// pool. See descriptoin of AddInstanceMethodToGlobalPool.
2146   void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);
2147 
2148   /// LookupMethodInGlobalPool - Returns the instance or factory method and
2149   /// optionally warns if there are multiple signatures.
2150   ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
2151                                            bool receiverIdOrClass,
2152                                            bool warn, bool instance);
2153 
2154 public:
2155   /// AddInstanceMethodToGlobalPool - All instance methods in a translation
2156   /// unit are added to a global pool. This allows us to efficiently associate
2157   /// a selector with a method declaraation for purposes of typechecking
2158   /// messages sent to "id" (where the class of the object is unknown).
2159   void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
2160     AddMethodToGlobalPool(Method, impl, /*instance*/true);
2161   }
2162 
2163   /// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
2164   void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
2165     AddMethodToGlobalPool(Method, impl, /*instance*/false);
2166   }
2167 
2168   /// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
2169   /// pool.
2170   void AddAnyMethodToGlobalPool(Decl *D);
2171 
2172   /// LookupInstanceMethodInGlobalPool - Returns the method and warns if
2173   /// there are multiple signatures.
2174   ObjCMethodDecl *LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R,
2175                                                    bool receiverIdOrClass=false,
2176                                                    bool warn=true) {
2177     return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
2178                                     warn, /*instance*/true);
2179   }
2180 
2181   /// LookupFactoryMethodInGlobalPool - Returns the method and warns if
2182   /// there are multiple signatures.
2183   ObjCMethodDecl *LookupFactoryMethodInGlobalPool(Selector Sel, SourceRange R,
2184                                                   bool receiverIdOrClass=false,
2185                                                   bool warn=true) {
2186     return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
2187                                     warn, /*instance*/false);
2188   }
2189 
2190   /// LookupImplementedMethodInGlobalPool - Returns the method which has an
2191   /// implementation.
2192   ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);
2193 
2194   /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
2195   /// initialization.
2196   void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
2197                                   SmallVectorImpl<ObjCIvarDecl*> &Ivars);
2198 
2199   //===--------------------------------------------------------------------===//
2200   // Statement Parsing Callbacks: SemaStmt.cpp.
2201 public:
2202   class FullExprArg {
2203   public:
FullExprArg(Sema & actions)2204     FullExprArg(Sema &actions) : E(0) { }
2205 
2206     // FIXME: The const_cast here is ugly. RValue references would make this
2207     // much nicer (or we could duplicate a bunch of the move semantics
2208     // emulation code from Ownership.h).
FullExprArg(const FullExprArg & Other)2209     FullExprArg(const FullExprArg& Other) : E(Other.E) {}
2210 
release()2211     ExprResult release() {
2212       return move(E);
2213     }
2214 
get()2215     Expr *get() const { return E; }
2216 
2217     Expr *operator->() {
2218       return E;
2219     }
2220 
2221   private:
2222     // FIXME: No need to make the entire Sema class a friend when it's just
2223     // Sema::MakeFullExpr that needs access to the constructor below.
2224     friend class Sema;
2225 
FullExprArg(Expr * expr)2226     explicit FullExprArg(Expr *expr) : E(expr) {}
2227 
2228     Expr *E;
2229   };
2230 
MakeFullExpr(Expr * Arg)2231   FullExprArg MakeFullExpr(Expr *Arg) {
2232     return FullExprArg(ActOnFinishFullExpr(Arg).release());
2233   }
2234 
2235   StmtResult ActOnExprStmt(FullExprArg Expr);
2236 
2237   StmtResult ActOnNullStmt(SourceLocation SemiLoc,
2238                            bool HasLeadingEmptyMacro = false);
2239 
2240   void ActOnStartOfCompoundStmt();
2241   void ActOnFinishOfCompoundStmt();
2242   StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
2243                                        MultiStmtArg Elts,
2244                                        bool isStmtExpr);
2245 
2246   /// \brief A RAII object to enter scope of a compound statement.
2247   class CompoundScopeRAII {
2248   public:
CompoundScopeRAII(Sema & S)2249     CompoundScopeRAII(Sema &S): S(S) {
2250       S.ActOnStartOfCompoundStmt();
2251     }
2252 
~CompoundScopeRAII()2253     ~CompoundScopeRAII() {
2254       S.ActOnFinishOfCompoundStmt();
2255     }
2256 
2257   private:
2258     Sema &S;
2259   };
2260 
2261   StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
2262                                    SourceLocation StartLoc,
2263                                    SourceLocation EndLoc);
2264   void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
2265   StmtResult ActOnForEachLValueExpr(Expr *E);
2266   StmtResult ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
2267                                    SourceLocation DotDotDotLoc, Expr *RHSVal,
2268                                    SourceLocation ColonLoc);
2269   void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);
2270 
2271   StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
2272                                       SourceLocation ColonLoc,
2273                                       Stmt *SubStmt, Scope *CurScope);
2274   StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
2275                             SourceLocation ColonLoc, Stmt *SubStmt);
2276 
2277   StmtResult ActOnAttributedStmt(SourceLocation AttrLoc, const AttrVec &Attrs,
2278                                  Stmt *SubStmt);
2279 
2280   StmtResult ActOnIfStmt(SourceLocation IfLoc,
2281                          FullExprArg CondVal, Decl *CondVar,
2282                          Stmt *ThenVal,
2283                          SourceLocation ElseLoc, Stmt *ElseVal);
2284   StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
2285                                             Expr *Cond,
2286                                             Decl *CondVar);
2287   StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
2288                                            Stmt *Switch, Stmt *Body);
2289   StmtResult ActOnWhileStmt(SourceLocation WhileLoc,
2290                             FullExprArg Cond,
2291                             Decl *CondVar, Stmt *Body);
2292   StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
2293                                  SourceLocation WhileLoc,
2294                                  SourceLocation CondLParen, Expr *Cond,
2295                                  SourceLocation CondRParen);
2296 
2297   StmtResult ActOnForStmt(SourceLocation ForLoc,
2298                           SourceLocation LParenLoc,
2299                           Stmt *First, FullExprArg Second,
2300                           Decl *SecondVar,
2301                           FullExprArg Third,
2302                           SourceLocation RParenLoc,
2303                           Stmt *Body);
2304   ExprResult ActOnObjCForCollectionOperand(SourceLocation forLoc,
2305                                            Expr *collection);
2306   StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
2307                                         SourceLocation LParenLoc,
2308                                         Stmt *First, Expr *Second,
2309                                         SourceLocation RParenLoc, Stmt *Body);
2310   StmtResult ActOnCXXForRangeStmt(SourceLocation ForLoc,
2311                                   SourceLocation LParenLoc, Stmt *LoopVar,
2312                                   SourceLocation ColonLoc, Expr *Collection,
2313                                   SourceLocation RParenLoc);
2314   StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
2315                                   SourceLocation ColonLoc,
2316                                   Stmt *RangeDecl, Stmt *BeginEndDecl,
2317                                   Expr *Cond, Expr *Inc,
2318                                   Stmt *LoopVarDecl,
2319                                   SourceLocation RParenLoc);
2320   StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);
2321 
2322   StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
2323                            SourceLocation LabelLoc,
2324                            LabelDecl *TheDecl);
2325   StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
2326                                    SourceLocation StarLoc,
2327                                    Expr *DestExp);
2328   StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
2329   StmtResult ActOnBreakStmt(SourceLocation GotoLoc, Scope *CurScope);
2330 
2331   const VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
2332                                          bool AllowFunctionParameters);
2333 
2334   StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
2335   StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
2336 
2337   StmtResult ActOnAsmStmt(SourceLocation AsmLoc,
2338                           bool IsSimple, bool IsVolatile,
2339                           unsigned NumOutputs, unsigned NumInputs,
2340                           IdentifierInfo **Names,
2341                           MultiExprArg Constraints,
2342                           MultiExprArg Exprs,
2343                           Expr *AsmString,
2344                           MultiExprArg Clobbers,
2345                           SourceLocation RParenLoc,
2346                           bool MSAsm = false);
2347 
2348 
2349   VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
2350                                   SourceLocation StartLoc,
2351                                   SourceLocation IdLoc, IdentifierInfo *Id,
2352                                   bool Invalid = false);
2353 
2354   Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);
2355 
2356   StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
2357                                   Decl *Parm, Stmt *Body);
2358 
2359   StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);
2360 
2361   StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
2362                                 MultiStmtArg Catch, Stmt *Finally);
2363 
2364   StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
2365   StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
2366                                   Scope *CurScope);
2367   ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
2368                                             Expr *operand);
2369   StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
2370                                          Expr *SynchExpr,
2371                                          Stmt *SynchBody);
2372 
2373   StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);
2374 
2375   VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
2376                                      SourceLocation StartLoc,
2377                                      SourceLocation IdLoc,
2378                                      IdentifierInfo *Id);
2379 
2380   Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);
2381 
2382   StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
2383                                 Decl *ExDecl, Stmt *HandlerBlock);
2384   StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
2385                               MultiStmtArg Handlers);
2386 
2387   StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
2388                               SourceLocation TryLoc,
2389                               Stmt *TryBlock,
2390                               Stmt *Handler);
2391 
2392   StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
2393                                  Expr *FilterExpr,
2394                                  Stmt *Block);
2395 
2396   StmtResult ActOnSEHFinallyBlock(SourceLocation Loc,
2397                                   Stmt *Block);
2398 
2399   void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);
2400 
2401   bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;
2402 
2403   /// \brief If it's a file scoped decl that must warn if not used, keep track
2404   /// of it.
2405   void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);
2406 
2407   /// DiagnoseUnusedExprResult - If the statement passed in is an expression
2408   /// whose result is unused, warn.
2409   void DiagnoseUnusedExprResult(const Stmt *S);
2410   void DiagnoseUnusedDecl(const NamedDecl *ND);
2411 
2412   /// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
2413   /// statement as a \p Body, and it is located on the same line.
2414   ///
2415   /// This helps prevent bugs due to typos, such as:
2416   ///     if (condition);
2417   ///       do_stuff();
2418   void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
2419                              const Stmt *Body,
2420                              unsigned DiagID);
2421 
2422   /// Warn if a for/while loop statement \p S, which is followed by
2423   /// \p PossibleBody, has a suspicious null statement as a body.
2424   void DiagnoseEmptyLoopBody(const Stmt *S,
2425                              const Stmt *PossibleBody);
2426 
PushParsingDeclaration()2427   ParsingDeclState PushParsingDeclaration() {
2428     return DelayedDiagnostics.pushParsingDecl();
2429   }
PopParsingDeclaration(ParsingDeclState state,Decl * decl)2430   void PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
2431     DelayedDiagnostics::popParsingDecl(*this, state, decl);
2432   }
2433 
2434   typedef ProcessingContextState ParsingClassState;
PushParsingClass()2435   ParsingClassState PushParsingClass() {
2436     return DelayedDiagnostics.pushContext();
2437   }
PopParsingClass(ParsingClassState state)2438   void PopParsingClass(ParsingClassState state) {
2439     DelayedDiagnostics.popContext(state);
2440   }
2441 
2442   void EmitDeprecationWarning(NamedDecl *D, StringRef Message,
2443                               SourceLocation Loc,
2444                               const ObjCInterfaceDecl *UnknownObjCClass=0);
2445 
2446   void HandleDelayedDeprecationCheck(sema::DelayedDiagnostic &DD, Decl *Ctx);
2447 
2448   bool makeUnavailableInSystemHeader(SourceLocation loc,
2449                                      StringRef message);
2450 
2451   //===--------------------------------------------------------------------===//
2452   // Expression Parsing Callbacks: SemaExpr.cpp.
2453 
2454   bool CanUseDecl(NamedDecl *D);
2455   bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
2456                          const ObjCInterfaceDecl *UnknownObjCClass=0);
2457   void NoteDeletedFunction(FunctionDecl *FD);
2458   std::string getDeletedOrUnavailableSuffix(const FunctionDecl *FD);
2459   bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
2460                                         ObjCMethodDecl *Getter,
2461                                         SourceLocation Loc);
2462   void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
2463                              Expr **Args, unsigned NumArgs);
2464 
2465   void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
2466                                        Decl *LambdaContextDecl = 0,
2467                                        bool IsDecltype = false);
2468 
2469   void PopExpressionEvaluationContext();
2470 
2471   void DiscardCleanupsInEvaluationContext();
2472 
2473   ExprResult TranformToPotentiallyEvaluated(Expr *E);
2474   ExprResult HandleExprEvaluationContextForTypeof(Expr *E);
2475 
2476   ExprResult ActOnConstantExpression(ExprResult Res);
2477 
2478   // Functions for marking a declaration referenced.  These functions also
2479   // contain the relevant logic for marking if a reference to a function or
2480   // variable is an odr-use (in the C++11 sense).  There are separate variants
2481   // for expressions referring to a decl; these exist because odr-use marking
2482   // needs to be delayed for some constant variables when we build one of the
2483   // named expressions.
2484   void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D);
2485   void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func);
2486   void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
2487   void MarkDeclRefReferenced(DeclRefExpr *E);
2488   void MarkMemberReferenced(MemberExpr *E);
2489 
2490   void UpdateMarkingForLValueToRValue(Expr *E);
2491   void CleanupVarDeclMarking();
2492 
2493   enum TryCaptureKind {
2494     TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
2495   };
2496 
2497   /// \brief Try to capture the given variable.
2498   ///
2499   /// \param Var The variable to capture.
2500   ///
2501   /// \param Loc The location at which the capture occurs.
2502   ///
2503   /// \param Kind The kind of capture, which may be implicit (for either a
2504   /// block or a lambda), or explicit by-value or by-reference (for a lambda).
2505   ///
2506   /// \param EllipsisLoc The location of the ellipsis, if one is provided in
2507   /// an explicit lambda capture.
2508   ///
2509   /// \param BuildAndDiagnose Whether we are actually supposed to add the
2510   /// captures or diagnose errors. If false, this routine merely check whether
2511   /// the capture can occur without performing the capture itself or complaining
2512   /// if the variable cannot be captured.
2513   ///
2514   /// \param CaptureType Will be set to the type of the field used to capture
2515   /// this variable in the innermost block or lambda. Only valid when the
2516   /// variable can be captured.
2517   ///
2518   /// \param DeclRefType Will be set to the type of a refernce to the capture
2519   /// from within the current scope. Only valid when the variable can be
2520   /// captured.
2521   ///
2522   /// \returns true if an error occurred (i.e., the variable cannot be
2523   /// captured) and false if the capture succeeded.
2524   bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
2525                           SourceLocation EllipsisLoc, bool BuildAndDiagnose,
2526                           QualType &CaptureType,
2527                           QualType &DeclRefType);
2528 
2529   /// \brief Try to capture the given variable.
2530   bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
2531                           TryCaptureKind Kind = TryCapture_Implicit,
2532                           SourceLocation EllipsisLoc = SourceLocation());
2533 
2534   /// \brief Given a variable, determine the type that a reference to that
2535   /// variable will have in the given scope.
2536   QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);
2537 
2538   void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
2539   void MarkDeclarationsReferencedInExpr(Expr *E,
2540                                         bool SkipLocalVariables = false);
2541 
2542   /// \brief Try to recover by turning the given expression into a
2543   /// call.  Returns true if recovery was attempted or an error was
2544   /// emitted; this may also leave the ExprResult invalid.
2545   bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
2546                             bool ForceComplain = false,
2547                             bool (*IsPlausibleResult)(QualType) = 0);
2548 
2549   /// \brief Figure out if an expression could be turned into a call.
2550   bool isExprCallable(const Expr &E, QualType &ZeroArgCallReturnTy,
2551                       UnresolvedSetImpl &NonTemplateOverloads);
2552 
2553   /// \brief Conditionally issue a diagnostic based on the current
2554   /// evaluation context.
2555   ///
2556   /// \param stmt - If stmt is non-null, delay reporting the diagnostic until
2557   ///  the function body is parsed, and then do a basic reachability analysis to
2558   ///  determine if the statement is reachable.  If it is unreachable, the
2559   ///  diagnostic will not be emitted.
2560   bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
2561                            const PartialDiagnostic &PD);
2562 
2563   // Primary Expressions.
2564   SourceRange getExprRange(Expr *E) const;
2565 
2566   ExprResult ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
2567                                SourceLocation TemplateKWLoc,
2568                                UnqualifiedId &Id,
2569                                bool HasTrailingLParen, bool IsAddressOfOperand,
2570                                CorrectionCandidateCallback *CCC = 0);
2571 
2572   void DecomposeUnqualifiedId(const UnqualifiedId &Id,
2573                               TemplateArgumentListInfo &Buffer,
2574                               DeclarationNameInfo &NameInfo,
2575                               const TemplateArgumentListInfo *&TemplateArgs);
2576 
2577   bool DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
2578                            CorrectionCandidateCallback &CCC,
2579                            TemplateArgumentListInfo *ExplicitTemplateArgs = 0,
2580                        llvm::ArrayRef<Expr *> Args = llvm::ArrayRef<Expr *>());
2581 
2582   ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
2583                                 IdentifierInfo *II,
2584                                 bool AllowBuiltinCreation=false);
2585 
2586   ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
2587                                         SourceLocation TemplateKWLoc,
2588                                         const DeclarationNameInfo &NameInfo,
2589                                         bool isAddressOfOperand,
2590                                 const TemplateArgumentListInfo *TemplateArgs);
2591 
2592   ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
2593                               ExprValueKind VK,
2594                               SourceLocation Loc,
2595                               const CXXScopeSpec *SS = 0);
2596   ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
2597                               ExprValueKind VK,
2598                               const DeclarationNameInfo &NameInfo,
2599                               const CXXScopeSpec *SS = 0);
2600   ExprResult
2601   BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS,
2602                                            SourceLocation nameLoc,
2603                                            IndirectFieldDecl *indirectField,
2604                                            Expr *baseObjectExpr = 0,
2605                                       SourceLocation opLoc = SourceLocation());
2606   ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
2607                                              SourceLocation TemplateKWLoc,
2608                                              LookupResult &R,
2609                                 const TemplateArgumentListInfo *TemplateArgs);
2610   ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
2611                                      SourceLocation TemplateKWLoc,
2612                                      LookupResult &R,
2613                                 const TemplateArgumentListInfo *TemplateArgs,
2614                                      bool IsDefiniteInstance);
2615   bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
2616                                   const LookupResult &R,
2617                                   bool HasTrailingLParen);
2618 
2619   ExprResult BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
2620                                          const DeclarationNameInfo &NameInfo);
2621   ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
2622                                        SourceLocation TemplateKWLoc,
2623                                 const DeclarationNameInfo &NameInfo,
2624                                 const TemplateArgumentListInfo *TemplateArgs);
2625 
2626   ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
2627                                       LookupResult &R,
2628                                       bool NeedsADL);
2629   ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
2630                                       const DeclarationNameInfo &NameInfo,
2631                                       NamedDecl *D);
2632 
2633   ExprResult BuildLiteralOperatorCall(LookupResult &R,
2634                                       DeclarationNameInfo &SuffixInfo,
2635                                       ArrayRef<Expr*> Args,
2636                                       SourceLocation LitEndLoc,
2637                             TemplateArgumentListInfo *ExplicitTemplateArgs = 0);
2638 
2639   ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
2640   ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);
2641   ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = 0);
2642   ExprResult ActOnCharacterConstant(const Token &Tok, Scope *UDLScope = 0);
2643   ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
2644   ExprResult ActOnParenListExpr(SourceLocation L,
2645                                 SourceLocation R,
2646                                 MultiExprArg Val);
2647 
2648   /// ActOnStringLiteral - The specified tokens were lexed as pasted string
2649   /// fragments (e.g. "foo" "bar" L"baz").
2650   ExprResult ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks,
2651                                 Scope *UDLScope = 0);
2652 
2653   ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
2654                                        SourceLocation DefaultLoc,
2655                                        SourceLocation RParenLoc,
2656                                        Expr *ControllingExpr,
2657                                        MultiTypeArg ArgTypes,
2658                                        MultiExprArg ArgExprs);
2659   ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
2660                                         SourceLocation DefaultLoc,
2661                                         SourceLocation RParenLoc,
2662                                         Expr *ControllingExpr,
2663                                         TypeSourceInfo **Types,
2664                                         Expr **Exprs,
2665                                         unsigned NumAssocs);
2666 
2667   // Binary/Unary Operators.  'Tok' is the token for the operator.
2668   ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
2669                                   Expr *InputExpr);
2670   ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
2671                           UnaryOperatorKind Opc, Expr *Input);
2672   ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
2673                           tok::TokenKind Op, Expr *Input);
2674 
2675   ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
2676                                             SourceLocation OpLoc,
2677                                             UnaryExprOrTypeTrait ExprKind,
2678                                             SourceRange R);
2679   ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
2680                                             UnaryExprOrTypeTrait ExprKind);
2681   ExprResult
2682     ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
2683                                   UnaryExprOrTypeTrait ExprKind,
2684                                   bool IsType, void *TyOrEx,
2685                                   const SourceRange &ArgRange);
2686 
2687   ExprResult CheckPlaceholderExpr(Expr *E);
2688   bool CheckVecStepExpr(Expr *E);
2689 
2690   bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
2691   bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
2692                                         SourceRange ExprRange,
2693                                         UnaryExprOrTypeTrait ExprKind);
2694   ExprResult ActOnSizeofParameterPackExpr(Scope *S,
2695                                           SourceLocation OpLoc,
2696                                           IdentifierInfo &Name,
2697                                           SourceLocation NameLoc,
2698                                           SourceLocation RParenLoc);
2699   ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
2700                                  tok::TokenKind Kind, Expr *Input);
2701 
2702   ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
2703                                      Expr *Idx, SourceLocation RLoc);
2704   ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
2705                                              Expr *Idx, SourceLocation RLoc);
2706 
2707   ExprResult BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
2708                                       SourceLocation OpLoc, bool IsArrow,
2709                                       CXXScopeSpec &SS,
2710                                       SourceLocation TemplateKWLoc,
2711                                       NamedDecl *FirstQualifierInScope,
2712                                 const DeclarationNameInfo &NameInfo,
2713                                 const TemplateArgumentListInfo *TemplateArgs);
2714 
2715   ExprResult BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
2716                                       SourceLocation OpLoc, bool IsArrow,
2717                                       const CXXScopeSpec &SS,
2718                                       SourceLocation TemplateKWLoc,
2719                                       NamedDecl *FirstQualifierInScope,
2720                                       LookupResult &R,
2721                                  const TemplateArgumentListInfo *TemplateArgs,
2722                                       bool SuppressQualifierCheck = false);
2723 
2724   ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);
2725   ExprResult LookupMemberExpr(LookupResult &R, ExprResult &Base,
2726                               bool &IsArrow, SourceLocation OpLoc,
2727                               CXXScopeSpec &SS,
2728                               Decl *ObjCImpDecl,
2729                               bool HasTemplateArgs);
2730 
2731   bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
2732                                      const CXXScopeSpec &SS,
2733                                      const LookupResult &R);
2734 
2735   ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
2736                                       bool IsArrow, SourceLocation OpLoc,
2737                                       const CXXScopeSpec &SS,
2738                                       SourceLocation TemplateKWLoc,
2739                                       NamedDecl *FirstQualifierInScope,
2740                                const DeclarationNameInfo &NameInfo,
2741                                const TemplateArgumentListInfo *TemplateArgs);
2742 
2743   ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
2744                                    SourceLocation OpLoc,
2745                                    tok::TokenKind OpKind,
2746                                    CXXScopeSpec &SS,
2747                                    SourceLocation TemplateKWLoc,
2748                                    UnqualifiedId &Member,
2749                                    Decl *ObjCImpDecl,
2750                                    bool HasTrailingLParen);
2751 
2752   void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
2753   bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
2754                                FunctionDecl *FDecl,
2755                                const FunctionProtoType *Proto,
2756                                Expr **Args, unsigned NumArgs,
2757                                SourceLocation RParenLoc,
2758                                bool ExecConfig = false);
2759   void CheckStaticArrayArgument(SourceLocation CallLoc,
2760                                 ParmVarDecl *Param,
2761                                 const Expr *ArgExpr);
2762 
2763   /// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
2764   /// This provides the location of the left/right parens and a list of comma
2765   /// locations.
2766   ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
2767                            MultiExprArg ArgExprs, SourceLocation RParenLoc,
2768                            Expr *ExecConfig = 0, bool IsExecConfig = false);
2769   ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
2770                                    SourceLocation LParenLoc,
2771                                    Expr **Args, unsigned NumArgs,
2772                                    SourceLocation RParenLoc,
2773                                    Expr *Config = 0,
2774                                    bool IsExecConfig = false);
2775 
2776   ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
2777                                      MultiExprArg ExecConfig,
2778                                      SourceLocation GGGLoc);
2779 
2780   ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
2781                            Declarator &D, ParsedType &Ty,
2782                            SourceLocation RParenLoc, Expr *CastExpr);
2783   ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
2784                                  TypeSourceInfo *Ty,
2785                                  SourceLocation RParenLoc,
2786                                  Expr *Op);
2787   CastKind PrepareScalarCast(ExprResult &src, QualType destType);
2788 
2789   /// \brief Build an altivec or OpenCL literal.
2790   ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
2791                                 SourceLocation RParenLoc, Expr *E,
2792                                 TypeSourceInfo *TInfo);
2793 
2794   ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);
2795 
2796   ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
2797                                   ParsedType Ty,
2798                                   SourceLocation RParenLoc,
2799                                   Expr *InitExpr);
2800 
2801   ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
2802                                       TypeSourceInfo *TInfo,
2803                                       SourceLocation RParenLoc,
2804                                       Expr *LiteralExpr);
2805 
2806   ExprResult ActOnInitList(SourceLocation LBraceLoc,
2807                            MultiExprArg InitArgList,
2808                            SourceLocation RBraceLoc);
2809 
2810   ExprResult ActOnDesignatedInitializer(Designation &Desig,
2811                                         SourceLocation Loc,
2812                                         bool GNUSyntax,
2813                                         ExprResult Init);
2814 
2815   ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
2816                         tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
2817   ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
2818                         BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
2819   ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
2820                                 Expr *LHSExpr, Expr *RHSExpr);
2821 
2822   /// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
2823   /// in the case of a the GNU conditional expr extension.
2824   ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
2825                                 SourceLocation ColonLoc,
2826                                 Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);
2827 
2828   /// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
2829   ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
2830                             LabelDecl *TheDecl);
2831 
2832   void ActOnStartStmtExpr();
2833   ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
2834                            SourceLocation RPLoc); // "({..})"
2835   void ActOnStmtExprError();
2836 
2837   // __builtin_offsetof(type, identifier(.identifier|[expr])*)
2838   struct OffsetOfComponent {
2839     SourceLocation LocStart, LocEnd;
2840     bool isBrackets;  // true if [expr], false if .ident
2841     union {
2842       IdentifierInfo *IdentInfo;
2843       Expr *E;
2844     } U;
2845   };
2846 
2847   /// __builtin_offsetof(type, a.b[123][456].c)
2848   ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
2849                                   TypeSourceInfo *TInfo,
2850                                   OffsetOfComponent *CompPtr,
2851                                   unsigned NumComponents,
2852                                   SourceLocation RParenLoc);
2853   ExprResult ActOnBuiltinOffsetOf(Scope *S,
2854                                   SourceLocation BuiltinLoc,
2855                                   SourceLocation TypeLoc,
2856                                   ParsedType ParsedArgTy,
2857                                   OffsetOfComponent *CompPtr,
2858                                   unsigned NumComponents,
2859                                   SourceLocation RParenLoc);
2860 
2861   // __builtin_choose_expr(constExpr, expr1, expr2)
2862   ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
2863                              Expr *CondExpr, Expr *LHSExpr,
2864                              Expr *RHSExpr, SourceLocation RPLoc);
2865 
2866   // __builtin_va_arg(expr, type)
2867   ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
2868                         SourceLocation RPLoc);
2869   ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
2870                             TypeSourceInfo *TInfo, SourceLocation RPLoc);
2871 
2872   // __null
2873   ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);
2874 
2875   bool CheckCaseExpression(Expr *E);
2876 
2877   /// \brief Describes the result of an "if-exists" condition check.
2878   enum IfExistsResult {
2879     /// \brief The symbol exists.
2880     IER_Exists,
2881 
2882     /// \brief The symbol does not exist.
2883     IER_DoesNotExist,
2884 
2885     /// \brief The name is a dependent name, so the results will differ
2886     /// from one instantiation to the next.
2887     IER_Dependent,
2888 
2889     /// \brief An error occurred.
2890     IER_Error
2891   };
2892 
2893   IfExistsResult
2894   CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
2895                                const DeclarationNameInfo &TargetNameInfo);
2896 
2897   IfExistsResult
2898   CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
2899                                bool IsIfExists, CXXScopeSpec &SS,
2900                                UnqualifiedId &Name);
2901 
2902   StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
2903                                         bool IsIfExists,
2904                                         NestedNameSpecifierLoc QualifierLoc,
2905                                         DeclarationNameInfo NameInfo,
2906                                         Stmt *Nested);
2907   StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
2908                                         bool IsIfExists,
2909                                         CXXScopeSpec &SS, UnqualifiedId &Name,
2910                                         Stmt *Nested);
2911 
2912   //===------------------------- "Block" Extension ------------------------===//
2913 
2914   /// ActOnBlockStart - This callback is invoked when a block literal is
2915   /// started.
2916   void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);
2917 
2918   /// ActOnBlockArguments - This callback allows processing of block arguments.
2919   /// If there are no arguments, this is still invoked.
2920   void ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope);
2921 
2922   /// ActOnBlockError - If there is an error parsing a block, this callback
2923   /// is invoked to pop the information about the block from the action impl.
2924   void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);
2925 
2926   /// ActOnBlockStmtExpr - This is called when the body of a block statement
2927   /// literal was successfully completed.  ^(int x){...}
2928   ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
2929                                 Scope *CurScope);
2930 
2931   //===---------------------------- OpenCL Features -----------------------===//
2932 
2933   /// __builtin_astype(...)
2934   ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
2935                              SourceLocation BuiltinLoc,
2936                              SourceLocation RParenLoc);
2937 
2938   //===---------------------------- C++ Features --------------------------===//
2939 
2940   // Act on C++ namespaces
2941   Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
2942                                SourceLocation NamespaceLoc,
2943                                SourceLocation IdentLoc,
2944                                IdentifierInfo *Ident,
2945                                SourceLocation LBrace,
2946                                AttributeList *AttrList);
2947   void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);
2948 
2949   NamespaceDecl *getStdNamespace() const;
2950   NamespaceDecl *getOrCreateStdNamespace();
2951 
2952   CXXRecordDecl *getStdBadAlloc() const;
2953 
2954   /// \brief Tests whether Ty is an instance of std::initializer_list and, if
2955   /// it is and Element is not NULL, assigns the element type to Element.
2956   bool isStdInitializerList(QualType Ty, QualType *Element);
2957 
2958   /// \brief Looks for the std::initializer_list template and instantiates it
2959   /// with Element, or emits an error if it's not found.
2960   ///
2961   /// \returns The instantiated template, or null on error.
2962   QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);
2963 
2964   /// \brief Determine whether Ctor is an initializer-list constructor, as
2965   /// defined in [dcl.init.list]p2.
2966   bool isInitListConstructor(const CXXConstructorDecl *Ctor);
2967 
2968   Decl *ActOnUsingDirective(Scope *CurScope,
2969                             SourceLocation UsingLoc,
2970                             SourceLocation NamespcLoc,
2971                             CXXScopeSpec &SS,
2972                             SourceLocation IdentLoc,
2973                             IdentifierInfo *NamespcName,
2974                             AttributeList *AttrList);
2975 
2976   void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);
2977 
2978   Decl *ActOnNamespaceAliasDef(Scope *CurScope,
2979                                SourceLocation NamespaceLoc,
2980                                SourceLocation AliasLoc,
2981                                IdentifierInfo *Alias,
2982                                CXXScopeSpec &SS,
2983                                SourceLocation IdentLoc,
2984                                IdentifierInfo *Ident);
2985 
2986   void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
2987   bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
2988                             const LookupResult &PreviousDecls);
2989   UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
2990                                         NamedDecl *Target);
2991 
2992   bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
2993                                    bool isTypeName,
2994                                    const CXXScopeSpec &SS,
2995                                    SourceLocation NameLoc,
2996                                    const LookupResult &Previous);
2997   bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
2998                                const CXXScopeSpec &SS,
2999                                SourceLocation NameLoc);
3000 
3001   NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
3002                                    SourceLocation UsingLoc,
3003                                    CXXScopeSpec &SS,
3004                                    const DeclarationNameInfo &NameInfo,
3005                                    AttributeList *AttrList,
3006                                    bool IsInstantiation,
3007                                    bool IsTypeName,
3008                                    SourceLocation TypenameLoc);
3009 
3010   bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);
3011 
3012   Decl *ActOnUsingDeclaration(Scope *CurScope,
3013                               AccessSpecifier AS,
3014                               bool HasUsingKeyword,
3015                               SourceLocation UsingLoc,
3016                               CXXScopeSpec &SS,
3017                               UnqualifiedId &Name,
3018                               AttributeList *AttrList,
3019                               bool IsTypeName,
3020                               SourceLocation TypenameLoc);
3021   Decl *ActOnAliasDeclaration(Scope *CurScope,
3022                               AccessSpecifier AS,
3023                               MultiTemplateParamsArg TemplateParams,
3024                               SourceLocation UsingLoc,
3025                               UnqualifiedId &Name,
3026                               TypeResult Type);
3027 
3028   /// InitializeVarWithConstructor - Creates an CXXConstructExpr
3029   /// and sets it as the initializer for the the passed in VarDecl.
3030   bool InitializeVarWithConstructor(VarDecl *VD,
3031                                     CXXConstructorDecl *Constructor,
3032                                     MultiExprArg Exprs,
3033                                     bool HadMultipleCandidates);
3034 
3035   /// BuildCXXConstructExpr - Creates a complete call to a constructor,
3036   /// including handling of its default argument expressions.
3037   ///
3038   /// \param ConstructKind - a CXXConstructExpr::ConstructionKind
3039   ExprResult
3040   BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
3041                         CXXConstructorDecl *Constructor, MultiExprArg Exprs,
3042                         bool HadMultipleCandidates, bool RequiresZeroInit,
3043                         unsigned ConstructKind, SourceRange ParenRange);
3044 
3045   // FIXME: Can re remove this and have the above BuildCXXConstructExpr check if
3046   // the constructor can be elidable?
3047   ExprResult
3048   BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
3049                         CXXConstructorDecl *Constructor, bool Elidable,
3050                         MultiExprArg Exprs, bool HadMultipleCandidates,
3051                         bool RequiresZeroInit, unsigned ConstructKind,
3052                         SourceRange ParenRange);
3053 
3054   /// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
3055   /// the default expr if needed.
3056   ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
3057                                     FunctionDecl *FD,
3058                                     ParmVarDecl *Param);
3059 
3060   /// FinalizeVarWithDestructor - Prepare for calling destructor on the
3061   /// constructed variable.
3062   void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);
3063 
3064   /// \brief Helper class that collects exception specifications for
3065   /// implicitly-declared special member functions.
3066   class ImplicitExceptionSpecification {
3067     // Pointer to allow copying
3068     Sema *Self;
3069     // We order exception specifications thus:
3070     // noexcept is the most restrictive, but is only used in C++0x.
3071     // throw() comes next.
3072     // Then a throw(collected exceptions)
3073     // Finally no specification.
3074     // throw(...) is used instead if any called function uses it.
3075     //
3076     // If this exception specification cannot be known yet (for instance,
3077     // because this is the exception specification for a defaulted default
3078     // constructor and we haven't finished parsing the deferred parts of the
3079     // class yet), the C++0x standard does not specify how to behave. We
3080     // record this as an 'unknown' exception specification, which overrules
3081     // any other specification (even 'none', to keep this rule simple).
3082     ExceptionSpecificationType ComputedEST;
3083     llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
3084     SmallVector<QualType, 4> Exceptions;
3085 
ClearExceptions()3086     void ClearExceptions() {
3087       ExceptionsSeen.clear();
3088       Exceptions.clear();
3089     }
3090 
3091   public:
ImplicitExceptionSpecification(Sema & Self)3092     explicit ImplicitExceptionSpecification(Sema &Self)
3093       : Self(&Self), ComputedEST(EST_BasicNoexcept) {
3094       if (!Self.Context.getLangOpts().CPlusPlus0x)
3095         ComputedEST = EST_DynamicNone;
3096     }
3097 
3098     /// \brief Get the computed exception specification type.
getExceptionSpecType()3099     ExceptionSpecificationType getExceptionSpecType() const {
3100       assert(ComputedEST != EST_ComputedNoexcept &&
3101              "noexcept(expr) should not be a possible result");
3102       return ComputedEST;
3103     }
3104 
3105     /// \brief The number of exceptions in the exception specification.
size()3106     unsigned size() const { return Exceptions.size(); }
3107 
3108     /// \brief The set of exceptions in the exception specification.
data()3109     const QualType *data() const { return Exceptions.data(); }
3110 
3111     /// \brief Integrate another called method into the collected data.
3112     void CalledDecl(SourceLocation CallLoc, CXXMethodDecl *Method);
3113 
3114     /// \brief Integrate an invoked expression into the collected data.
3115     void CalledExpr(Expr *E);
3116 
3117     /// \brief Specify that the exception specification can't be detemined yet.
SetDelayed()3118     void SetDelayed() {
3119       ClearExceptions();
3120       ComputedEST = EST_Delayed;
3121     }
3122 
getEPI()3123     FunctionProtoType::ExtProtoInfo getEPI() const {
3124       FunctionProtoType::ExtProtoInfo EPI;
3125       EPI.ExceptionSpecType = getExceptionSpecType();
3126       EPI.NumExceptions = size();
3127       EPI.Exceptions = data();
3128       return EPI;
3129     }
3130   };
3131 
3132   /// \brief Determine what sort of exception specification a defaulted
3133   /// copy constructor of a class will have.
3134   ImplicitExceptionSpecification
3135   ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl);
3136 
3137   /// \brief Determine what sort of exception specification a defaulted
3138   /// default constructor of a class will have, and whether the parameter
3139   /// will be const.
3140   std::pair<ImplicitExceptionSpecification, bool>
3141   ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl);
3142 
3143   /// \brief Determine what sort of exception specification a defautled
3144   /// copy assignment operator of a class will have, and whether the
3145   /// parameter will be const.
3146   std::pair<ImplicitExceptionSpecification, bool>
3147   ComputeDefaultedCopyAssignmentExceptionSpecAndConst(CXXRecordDecl *ClassDecl);
3148 
3149   /// \brief Determine what sort of exception specification a defaulted move
3150   /// constructor of a class will have.
3151   ImplicitExceptionSpecification
3152   ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl);
3153 
3154   /// \brief Determine what sort of exception specification a defaulted move
3155   /// assignment operator of a class will have.
3156   ImplicitExceptionSpecification
3157   ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl);
3158 
3159   /// \brief Determine what sort of exception specification a defaulted
3160   /// destructor of a class will have.
3161   ImplicitExceptionSpecification
3162   ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl);
3163 
3164   /// \brief Check the given exception-specification and update the
3165   /// extended prototype information with the results.
3166   void checkExceptionSpecification(ExceptionSpecificationType EST,
3167                                    ArrayRef<ParsedType> DynamicExceptions,
3168                                    ArrayRef<SourceRange> DynamicExceptionRanges,
3169                                    Expr *NoexceptExpr,
3170                                    llvm::SmallVectorImpl<QualType> &Exceptions,
3171                                    FunctionProtoType::ExtProtoInfo &EPI);
3172 
3173   /// \brief Add an exception-specification to the given member function
3174   /// (or member function template). The exception-specification was parsed
3175   /// after the method itself was declared.
3176   void actOnDelayedExceptionSpecification(Decl *Method,
3177          ExceptionSpecificationType EST,
3178          SourceRange SpecificationRange,
3179          ArrayRef<ParsedType> DynamicExceptions,
3180          ArrayRef<SourceRange> DynamicExceptionRanges,
3181          Expr *NoexceptExpr);
3182 
3183   /// \brief Determine if a special member function should have a deleted
3184   /// definition when it is defaulted.
3185   bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
3186                                  bool Diagnose = false);
3187 
3188   /// \brief Declare the implicit default constructor for the given class.
3189   ///
3190   /// \param ClassDecl The class declaration into which the implicit
3191   /// default constructor will be added.
3192   ///
3193   /// \returns The implicitly-declared default constructor.
3194   CXXConstructorDecl *DeclareImplicitDefaultConstructor(
3195                                                      CXXRecordDecl *ClassDecl);
3196 
3197   /// DefineImplicitDefaultConstructor - Checks for feasibility of
3198   /// defining this constructor as the default constructor.
3199   void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
3200                                         CXXConstructorDecl *Constructor);
3201 
3202   /// \brief Declare the implicit destructor for the given class.
3203   ///
3204   /// \param ClassDecl The class declaration into which the implicit
3205   /// destructor will be added.
3206   ///
3207   /// \returns The implicitly-declared destructor.
3208   CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);
3209 
3210   /// DefineImplicitDestructor - Checks for feasibility of
3211   /// defining this destructor as the default destructor.
3212   void DefineImplicitDestructor(SourceLocation CurrentLocation,
3213                                 CXXDestructorDecl *Destructor);
3214 
3215   /// \brief Build an exception spec for destructors that don't have one.
3216   ///
3217   /// C++11 says that user-defined destructors with no exception spec get one
3218   /// that looks as if the destructor was implicitly declared.
3219   void AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
3220                                      CXXDestructorDecl *Destructor);
3221 
3222   /// \brief Declare all inherited constructors for the given class.
3223   ///
3224   /// \param ClassDecl The class declaration into which the inherited
3225   /// constructors will be added.
3226   void DeclareInheritedConstructors(CXXRecordDecl *ClassDecl);
3227 
3228   /// \brief Declare the implicit copy constructor for the given class.
3229   ///
3230   /// \param ClassDecl The class declaration into which the implicit
3231   /// copy constructor will be added.
3232   ///
3233   /// \returns The implicitly-declared copy constructor.
3234   CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);
3235 
3236   /// DefineImplicitCopyConstructor - Checks for feasibility of
3237   /// defining this constructor as the copy constructor.
3238   void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
3239                                      CXXConstructorDecl *Constructor);
3240 
3241   /// \brief Declare the implicit move constructor for the given class.
3242   ///
3243   /// \param ClassDecl The Class declaration into which the implicit
3244   /// move constructor will be added.
3245   ///
3246   /// \returns The implicitly-declared move constructor, or NULL if it wasn't
3247   /// declared.
3248   CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);
3249 
3250   /// DefineImplicitMoveConstructor - Checks for feasibility of
3251   /// defining this constructor as the move constructor.
3252   void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
3253                                      CXXConstructorDecl *Constructor);
3254 
3255   /// \brief Declare the implicit copy assignment operator for the given class.
3256   ///
3257   /// \param ClassDecl The class declaration into which the implicit
3258   /// copy assignment operator will be added.
3259   ///
3260   /// \returns The implicitly-declared copy assignment operator.
3261   CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);
3262 
3263   /// \brief Defines an implicitly-declared copy assignment operator.
3264   void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
3265                                     CXXMethodDecl *MethodDecl);
3266 
3267   /// \brief Declare the implicit move assignment operator for the given class.
3268   ///
3269   /// \param ClassDecl The Class declaration into which the implicit
3270   /// move assignment operator will be added.
3271   ///
3272   /// \returns The implicitly-declared move assignment operator, or NULL if it
3273   /// wasn't declared.
3274   CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);
3275 
3276   /// \brief Defines an implicitly-declared move assignment operator.
3277   void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
3278                                     CXXMethodDecl *MethodDecl);
3279 
3280   /// \brief Force the declaration of any implicitly-declared members of this
3281   /// class.
3282   void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);
3283 
3284   /// \brief Determine whether the given function is an implicitly-deleted
3285   /// special member function.
3286   bool isImplicitlyDeleted(FunctionDecl *FD);
3287 
3288   /// \brief Check whether 'this' shows up in the type of a static member
3289   /// function after the (naturally empty) cv-qualifier-seq would be.
3290   ///
3291   /// \returns true if an error occurred.
3292   bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);
3293 
3294   /// \brief Whether this' shows up in the exception specification of a static
3295   /// member function.
3296   bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);
3297 
3298   /// \brief Check whether 'this' shows up in the attributes of the given
3299   /// static member function.
3300   ///
3301   /// \returns true if an error occurred.
3302   bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);
3303 
3304   /// MaybeBindToTemporary - If the passed in expression has a record type with
3305   /// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
3306   /// it simply returns the passed in expression.
3307   ExprResult MaybeBindToTemporary(Expr *E);
3308 
3309   bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
3310                                MultiExprArg ArgsPtr,
3311                                SourceLocation Loc,
3312                                ASTOwningVector<Expr*> &ConvertedArgs,
3313                                bool AllowExplicit = false);
3314 
3315   ParsedType getDestructorName(SourceLocation TildeLoc,
3316                                IdentifierInfo &II, SourceLocation NameLoc,
3317                                Scope *S, CXXScopeSpec &SS,
3318                                ParsedType ObjectType,
3319                                bool EnteringContext);
3320 
3321   ParsedType getDestructorType(const DeclSpec& DS, ParsedType ObjectType);
3322 
3323   // Checks that reinterpret casts don't have undefined behavior.
3324   void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
3325                                       bool IsDereference, SourceRange Range);
3326 
3327   /// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
3328   ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
3329                                tok::TokenKind Kind,
3330                                SourceLocation LAngleBracketLoc,
3331                                Declarator &D,
3332                                SourceLocation RAngleBracketLoc,
3333                                SourceLocation LParenLoc,
3334                                Expr *E,
3335                                SourceLocation RParenLoc);
3336 
3337   ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
3338                                tok::TokenKind Kind,
3339                                TypeSourceInfo *Ty,
3340                                Expr *E,
3341                                SourceRange AngleBrackets,
3342                                SourceRange Parens);
3343 
3344   ExprResult BuildCXXTypeId(QualType TypeInfoType,
3345                             SourceLocation TypeidLoc,
3346                             TypeSourceInfo *Operand,
3347                             SourceLocation RParenLoc);
3348   ExprResult BuildCXXTypeId(QualType TypeInfoType,
3349                             SourceLocation TypeidLoc,
3350                             Expr *Operand,
3351                             SourceLocation RParenLoc);
3352 
3353   /// ActOnCXXTypeid - Parse typeid( something ).
3354   ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
3355                             SourceLocation LParenLoc, bool isType,
3356                             void *TyOrExpr,
3357                             SourceLocation RParenLoc);
3358 
3359   ExprResult BuildCXXUuidof(QualType TypeInfoType,
3360                             SourceLocation TypeidLoc,
3361                             TypeSourceInfo *Operand,
3362                             SourceLocation RParenLoc);
3363   ExprResult BuildCXXUuidof(QualType TypeInfoType,
3364                             SourceLocation TypeidLoc,
3365                             Expr *Operand,
3366                             SourceLocation RParenLoc);
3367 
3368   /// ActOnCXXUuidof - Parse __uuidof( something ).
3369   ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
3370                             SourceLocation LParenLoc, bool isType,
3371                             void *TyOrExpr,
3372                             SourceLocation RParenLoc);
3373 
3374 
3375   //// ActOnCXXThis -  Parse 'this' pointer.
3376   ExprResult ActOnCXXThis(SourceLocation loc);
3377 
3378   /// \brief Try to retrieve the type of the 'this' pointer.
3379   ///
3380   /// \param Capture If true, capture 'this' in this context.
3381   ///
3382   /// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
3383   QualType getCurrentThisType();
3384 
3385   /// \brief When non-NULL, the C++ 'this' expression is allowed despite the
3386   /// current context not being a non-static member function. In such cases,
3387   /// this provides the type used for 'this'.
3388   QualType CXXThisTypeOverride;
3389 
3390   /// \brief RAII object used to temporarily allow the C++ 'this' expression
3391   /// to be used, with the given qualifiers on the current class type.
3392   class CXXThisScopeRAII {
3393     Sema &S;
3394     QualType OldCXXThisTypeOverride;
3395     bool Enabled;
3396 
3397   public:
3398     /// \brief Introduce a new scope where 'this' may be allowed (when enabled),
3399     /// using the given declaration (which is either a class template or a
3400     /// class) along with the given qualifiers.
3401     /// along with the qualifiers placed on '*this'.
3402     CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
3403                      bool Enabled = true);
3404 
3405     ~CXXThisScopeRAII();
3406   };
3407 
3408   /// \brief Make sure the value of 'this' is actually available in the current
3409   /// context, if it is a potentially evaluated context.
3410   ///
3411   /// \param Loc The location at which the capture of 'this' occurs.
3412   ///
3413   /// \param Explicit Whether 'this' is explicitly captured in a lambda
3414   /// capture list.
3415   void CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false);
3416 
3417   /// \brief Determine whether the given type is the type of *this that is used
3418   /// outside of the body of a member function for a type that is currently
3419   /// being defined.
3420   bool isThisOutsideMemberFunctionBody(QualType BaseType);
3421 
3422   /// ActOnCXXBoolLiteral - Parse {true,false} literals.
3423   ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
3424 
3425 
3426   /// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
3427   ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
3428 
3429   /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
3430   ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);
3431 
3432   //// ActOnCXXThrow -  Parse throw expressions.
3433   ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
3434   ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
3435                            bool IsThrownVarInScope);
3436   ExprResult CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *E,
3437                                   bool IsThrownVarInScope);
3438 
3439   /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
3440   /// Can be interpreted either as function-style casting ("int(x)")
3441   /// or class type construction ("ClassType(x,y,z)")
3442   /// or creation of a value-initialized type ("int()").
3443   ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
3444                                        SourceLocation LParenLoc,
3445                                        MultiExprArg Exprs,
3446                                        SourceLocation RParenLoc);
3447 
3448   ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
3449                                        SourceLocation LParenLoc,
3450                                        MultiExprArg Exprs,
3451                                        SourceLocation RParenLoc);
3452 
3453   /// ActOnCXXNew - Parsed a C++ 'new' expression.
3454   ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
3455                          SourceLocation PlacementLParen,
3456                          MultiExprArg PlacementArgs,
3457                          SourceLocation PlacementRParen,
3458                          SourceRange TypeIdParens, Declarator &D,
3459                          Expr *Initializer);
3460   ExprResult BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
3461                          SourceLocation PlacementLParen,
3462                          MultiExprArg PlacementArgs,
3463                          SourceLocation PlacementRParen,
3464                          SourceRange TypeIdParens,
3465                          QualType AllocType,
3466                          TypeSourceInfo *AllocTypeInfo,
3467                          Expr *ArraySize,
3468                          SourceRange DirectInitRange,
3469                          Expr *Initializer,
3470                          bool TypeMayContainAuto = true);
3471 
3472   bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
3473                           SourceRange R);
3474   bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
3475                                bool UseGlobal, QualType AllocType, bool IsArray,
3476                                Expr **PlaceArgs, unsigned NumPlaceArgs,
3477                                FunctionDecl *&OperatorNew,
3478                                FunctionDecl *&OperatorDelete);
3479   bool FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
3480                               DeclarationName Name, Expr** Args,
3481                               unsigned NumArgs, DeclContext *Ctx,
3482                               bool AllowMissing, FunctionDecl *&Operator,
3483                               bool Diagnose = true);
3484   void DeclareGlobalNewDelete();
3485   void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
3486                                        QualType Argument,
3487                                        bool addMallocAttr = false);
3488 
3489   bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
3490                                 DeclarationName Name, FunctionDecl* &Operator,
3491                                 bool Diagnose = true);
3492 
3493   /// ActOnCXXDelete - Parsed a C++ 'delete' expression
3494   ExprResult ActOnCXXDelete(SourceLocation StartLoc,
3495                             bool UseGlobal, bool ArrayForm,
3496                             Expr *Operand);
3497 
3498   DeclResult ActOnCXXConditionDeclaration(Scope *S, Declarator &D);
3499   ExprResult CheckConditionVariable(VarDecl *ConditionVar,
3500                                     SourceLocation StmtLoc,
3501                                     bool ConvertToBoolean);
3502 
3503   ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
3504                                Expr *Operand, SourceLocation RParen);
3505   ExprResult BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
3506                                   SourceLocation RParen);
3507 
3508   /// ActOnUnaryTypeTrait - Parsed one of the unary type trait support
3509   /// pseudo-functions.
3510   ExprResult ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
3511                                  SourceLocation KWLoc,
3512                                  ParsedType Ty,
3513                                  SourceLocation RParen);
3514 
3515   ExprResult BuildUnaryTypeTrait(UnaryTypeTrait OTT,
3516                                  SourceLocation KWLoc,
3517                                  TypeSourceInfo *T,
3518                                  SourceLocation RParen);
3519 
3520   /// ActOnBinaryTypeTrait - Parsed one of the bianry type trait support
3521   /// pseudo-functions.
3522   ExprResult ActOnBinaryTypeTrait(BinaryTypeTrait OTT,
3523                                   SourceLocation KWLoc,
3524                                   ParsedType LhsTy,
3525                                   ParsedType RhsTy,
3526                                   SourceLocation RParen);
3527 
3528   ExprResult BuildBinaryTypeTrait(BinaryTypeTrait BTT,
3529                                   SourceLocation KWLoc,
3530                                   TypeSourceInfo *LhsT,
3531                                   TypeSourceInfo *RhsT,
3532                                   SourceLocation RParen);
3533 
3534   /// \brief Parsed one of the type trait support pseudo-functions.
3535   ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
3536                             ArrayRef<ParsedType> Args,
3537                             SourceLocation RParenLoc);
3538   ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
3539                             ArrayRef<TypeSourceInfo *> Args,
3540                             SourceLocation RParenLoc);
3541 
3542   /// ActOnArrayTypeTrait - Parsed one of the bianry type trait support
3543   /// pseudo-functions.
3544   ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
3545                                  SourceLocation KWLoc,
3546                                  ParsedType LhsTy,
3547                                  Expr *DimExpr,
3548                                  SourceLocation RParen);
3549 
3550   ExprResult BuildArrayTypeTrait(ArrayTypeTrait ATT,
3551                                  SourceLocation KWLoc,
3552                                  TypeSourceInfo *TSInfo,
3553                                  Expr *DimExpr,
3554                                  SourceLocation RParen);
3555 
3556   /// ActOnExpressionTrait - Parsed one of the unary type trait support
3557   /// pseudo-functions.
3558   ExprResult ActOnExpressionTrait(ExpressionTrait OET,
3559                                   SourceLocation KWLoc,
3560                                   Expr *Queried,
3561                                   SourceLocation RParen);
3562 
3563   ExprResult BuildExpressionTrait(ExpressionTrait OET,
3564                                   SourceLocation KWLoc,
3565                                   Expr *Queried,
3566                                   SourceLocation RParen);
3567 
3568   ExprResult ActOnStartCXXMemberReference(Scope *S,
3569                                           Expr *Base,
3570                                           SourceLocation OpLoc,
3571                                           tok::TokenKind OpKind,
3572                                           ParsedType &ObjectType,
3573                                           bool &MayBePseudoDestructor);
3574 
3575   ExprResult DiagnoseDtorReference(SourceLocation NameLoc, Expr *MemExpr);
3576 
3577   ExprResult BuildPseudoDestructorExpr(Expr *Base,
3578                                        SourceLocation OpLoc,
3579                                        tok::TokenKind OpKind,
3580                                        const CXXScopeSpec &SS,
3581                                        TypeSourceInfo *ScopeType,
3582                                        SourceLocation CCLoc,
3583                                        SourceLocation TildeLoc,
3584                                      PseudoDestructorTypeStorage DestroyedType,
3585                                        bool HasTrailingLParen);
3586 
3587   ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
3588                                        SourceLocation OpLoc,
3589                                        tok::TokenKind OpKind,
3590                                        CXXScopeSpec &SS,
3591                                        UnqualifiedId &FirstTypeName,
3592                                        SourceLocation CCLoc,
3593                                        SourceLocation TildeLoc,
3594                                        UnqualifiedId &SecondTypeName,
3595                                        bool HasTrailingLParen);
3596 
3597   ExprResult ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
3598                                        SourceLocation OpLoc,
3599                                        tok::TokenKind OpKind,
3600                                        SourceLocation TildeLoc,
3601                                        const DeclSpec& DS,
3602                                        bool HasTrailingLParen);
3603 
3604   /// MaybeCreateExprWithCleanups - If the current full-expression
3605   /// requires any cleanups, surround it with a ExprWithCleanups node.
3606   /// Otherwise, just returns the passed-in expression.
3607   Expr *MaybeCreateExprWithCleanups(Expr *SubExpr);
3608   Stmt *MaybeCreateStmtWithCleanups(Stmt *SubStmt);
3609   ExprResult MaybeCreateExprWithCleanups(ExprResult SubExpr);
3610 
3611   ExprResult ActOnFinishFullExpr(Expr *Expr);
3612   StmtResult ActOnFinishFullStmt(Stmt *Stmt);
3613 
3614   // Marks SS invalid if it represents an incomplete type.
3615   bool RequireCompleteDeclContext(CXXScopeSpec &SS, DeclContext *DC);
3616 
3617   DeclContext *computeDeclContext(QualType T);
3618   DeclContext *computeDeclContext(const CXXScopeSpec &SS,
3619                                   bool EnteringContext = false);
3620   bool isDependentScopeSpecifier(const CXXScopeSpec &SS);
3621   CXXRecordDecl *getCurrentInstantiationOf(NestedNameSpecifier *NNS);
3622   bool isUnknownSpecialization(const CXXScopeSpec &SS);
3623 
3624   /// \brief The parser has parsed a global nested-name-specifier '::'.
3625   ///
3626   /// \param S The scope in which this nested-name-specifier occurs.
3627   ///
3628   /// \param CCLoc The location of the '::'.
3629   ///
3630   /// \param SS The nested-name-specifier, which will be updated in-place
3631   /// to reflect the parsed nested-name-specifier.
3632   ///
3633   /// \returns true if an error occurred, false otherwise.
3634   bool ActOnCXXGlobalScopeSpecifier(Scope *S, SourceLocation CCLoc,
3635                                     CXXScopeSpec &SS);
3636 
3637   bool isAcceptableNestedNameSpecifier(NamedDecl *SD);
3638   NamedDecl *FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS);
3639 
3640   bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
3641                                     SourceLocation IdLoc,
3642                                     IdentifierInfo &II,
3643                                     ParsedType ObjectType);
3644 
3645   bool BuildCXXNestedNameSpecifier(Scope *S,
3646                                    IdentifierInfo &Identifier,
3647                                    SourceLocation IdentifierLoc,
3648                                    SourceLocation CCLoc,
3649                                    QualType ObjectType,
3650                                    bool EnteringContext,
3651                                    CXXScopeSpec &SS,
3652                                    NamedDecl *ScopeLookupResult,
3653                                    bool ErrorRecoveryLookup);
3654 
3655   /// \brief The parser has parsed a nested-name-specifier 'identifier::'.
3656   ///
3657   /// \param S The scope in which this nested-name-specifier occurs.
3658   ///
3659   /// \param Identifier The identifier preceding the '::'.
3660   ///
3661   /// \param IdentifierLoc The location of the identifier.
3662   ///
3663   /// \param CCLoc The location of the '::'.
3664   ///
3665   /// \param ObjectType The type of the object, if we're parsing
3666   /// nested-name-specifier in a member access expression.
3667   ///
3668   /// \param EnteringContext Whether we're entering the context nominated by
3669   /// this nested-name-specifier.
3670   ///
3671   /// \param SS The nested-name-specifier, which is both an input
3672   /// parameter (the nested-name-specifier before this type) and an
3673   /// output parameter (containing the full nested-name-specifier,
3674   /// including this new type).
3675   ///
3676   /// \returns true if an error occurred, false otherwise.
3677   bool ActOnCXXNestedNameSpecifier(Scope *S,
3678                                    IdentifierInfo &Identifier,
3679                                    SourceLocation IdentifierLoc,
3680                                    SourceLocation CCLoc,
3681                                    ParsedType ObjectType,
3682                                    bool EnteringContext,
3683                                    CXXScopeSpec &SS);
3684 
3685   ExprResult ActOnDecltypeExpression(Expr *E);
3686 
3687   bool ActOnCXXNestedNameSpecifierDecltype(CXXScopeSpec &SS,
3688                                            const DeclSpec &DS,
3689                                            SourceLocation ColonColonLoc);
3690 
3691   bool IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
3692                                  IdentifierInfo &Identifier,
3693                                  SourceLocation IdentifierLoc,
3694                                  SourceLocation ColonLoc,
3695                                  ParsedType ObjectType,
3696                                  bool EnteringContext);
3697 
3698   /// \brief The parser has parsed a nested-name-specifier
3699   /// 'template[opt] template-name < template-args >::'.
3700   ///
3701   /// \param S The scope in which this nested-name-specifier occurs.
3702   ///
3703   /// \param SS The nested-name-specifier, which is both an input
3704   /// parameter (the nested-name-specifier before this type) and an
3705   /// output parameter (containing the full nested-name-specifier,
3706   /// including this new type).
3707   ///
3708   /// \param TemplateKWLoc the location of the 'template' keyword, if any.
3709   /// \param TemplateName The template name.
3710   /// \param TemplateNameLoc The location of the template name.
3711   /// \param LAngleLoc The location of the opening angle bracket  ('<').
3712   /// \param TemplateArgs The template arguments.
3713   /// \param RAngleLoc The location of the closing angle bracket  ('>').
3714   /// \param CCLoc The location of the '::'.
3715   ///
3716   /// \param EnteringContext Whether we're entering the context of the
3717   /// nested-name-specifier.
3718   ///
3719   ///
3720   /// \returns true if an error occurred, false otherwise.
3721   bool ActOnCXXNestedNameSpecifier(Scope *S,
3722                                    CXXScopeSpec &SS,
3723                                    SourceLocation TemplateKWLoc,
3724                                    TemplateTy Template,
3725                                    SourceLocation TemplateNameLoc,
3726                                    SourceLocation LAngleLoc,
3727                                    ASTTemplateArgsPtr TemplateArgs,
3728                                    SourceLocation RAngleLoc,
3729                                    SourceLocation CCLoc,
3730                                    bool EnteringContext);
3731 
3732   /// \brief Given a C++ nested-name-specifier, produce an annotation value
3733   /// that the parser can use later to reconstruct the given
3734   /// nested-name-specifier.
3735   ///
3736   /// \param SS A nested-name-specifier.
3737   ///
3738   /// \returns A pointer containing all of the information in the
3739   /// nested-name-specifier \p SS.
3740   void *SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS);
3741 
3742   /// \brief Given an annotation pointer for a nested-name-specifier, restore
3743   /// the nested-name-specifier structure.
3744   ///
3745   /// \param Annotation The annotation pointer, produced by
3746   /// \c SaveNestedNameSpecifierAnnotation().
3747   ///
3748   /// \param AnnotationRange The source range corresponding to the annotation.
3749   ///
3750   /// \param SS The nested-name-specifier that will be updated with the contents
3751   /// of the annotation pointer.
3752   void RestoreNestedNameSpecifierAnnotation(void *Annotation,
3753                                             SourceRange AnnotationRange,
3754                                             CXXScopeSpec &SS);
3755 
3756   bool ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS);
3757 
3758   /// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
3759   /// scope or nested-name-specifier) is parsed, part of a declarator-id.
3760   /// After this method is called, according to [C++ 3.4.3p3], names should be
3761   /// looked up in the declarator-id's scope, until the declarator is parsed and
3762   /// ActOnCXXExitDeclaratorScope is called.
3763   /// The 'SS' should be a non-empty valid CXXScopeSpec.
3764   bool ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS);
3765 
3766   /// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
3767   /// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
3768   /// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
3769   /// Used to indicate that names should revert to being looked up in the
3770   /// defining scope.
3771   void ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS);
3772 
3773   /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an
3774   /// initializer for the declaration 'Dcl'.
3775   /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a
3776   /// static data member of class X, names should be looked up in the scope of
3777   /// class X.
3778   void ActOnCXXEnterDeclInitializer(Scope *S, Decl *Dcl);
3779 
3780   /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an
3781   /// initializer for the declaration 'Dcl'.
3782   void ActOnCXXExitDeclInitializer(Scope *S, Decl *Dcl);
3783 
3784   /// \brief Create a new lambda closure type.
3785   CXXRecordDecl *createLambdaClosureType(SourceRange IntroducerRange,
3786                                          bool KnownDependent = false);
3787 
3788   /// \brief Start the definition of a lambda expression.
3789   CXXMethodDecl *startLambdaDefinition(CXXRecordDecl *Class,
3790                                        SourceRange IntroducerRange,
3791                                        TypeSourceInfo *MethodType,
3792                                        SourceLocation EndLoc,
3793                                        llvm::ArrayRef<ParmVarDecl *> Params,
3794                                        llvm::Optional<unsigned> ManglingNumber
3795                                          = llvm::Optional<unsigned>(),
3796                                        Decl *ContextDecl = 0);
3797 
3798   /// \brief Introduce the scope for a lambda expression.
3799   sema::LambdaScopeInfo *enterLambdaScope(CXXMethodDecl *CallOperator,
3800                                           SourceRange IntroducerRange,
3801                                           LambdaCaptureDefault CaptureDefault,
3802                                           bool ExplicitParams,
3803                                           bool ExplicitResultType,
3804                                           bool Mutable);
3805 
3806   /// \brief Note that we have finished the explicit captures for the
3807   /// given lambda.
3808   void finishLambdaExplicitCaptures(sema::LambdaScopeInfo *LSI);
3809 
3810   /// \brief Introduce the lambda parameters into scope.
3811   void addLambdaParameters(CXXMethodDecl *CallOperator, Scope *CurScope);
3812 
3813   /// ActOnStartOfLambdaDefinition - This is called just before we start
3814   /// parsing the body of a lambda; it analyzes the explicit captures and
3815   /// arguments, and sets up various data-structures for the body of the
3816   /// lambda.
3817   void ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
3818                                     Declarator &ParamInfo, Scope *CurScope);
3819 
3820   /// ActOnLambdaError - If there is an error parsing a lambda, this callback
3821   /// is invoked to pop the information about the lambda.
3822   void ActOnLambdaError(SourceLocation StartLoc, Scope *CurScope,
3823                         bool IsInstantiation = false);
3824 
3825   /// ActOnLambdaExpr - This is called when the body of a lambda expression
3826   /// was successfully completed.
3827   ExprResult ActOnLambdaExpr(SourceLocation StartLoc, Stmt *Body,
3828                              Scope *CurScope,
3829                              bool IsInstantiation = false);
3830 
3831   /// \brief Define the "body" of the conversion from a lambda object to a
3832   /// function pointer.
3833   ///
3834   /// This routine doesn't actually define a sensible body; rather, it fills
3835   /// in the initialization expression needed to copy the lambda object into
3836   /// the block, and IR generation actually generates the real body of the
3837   /// block pointer conversion.
3838   void DefineImplicitLambdaToFunctionPointerConversion(
3839          SourceLocation CurrentLoc, CXXConversionDecl *Conv);
3840 
3841   /// \brief Define the "body" of the conversion from a lambda object to a
3842   /// block pointer.
3843   ///
3844   /// This routine doesn't actually define a sensible body; rather, it fills
3845   /// in the initialization expression needed to copy the lambda object into
3846   /// the block, and IR generation actually generates the real body of the
3847   /// block pointer conversion.
3848   void DefineImplicitLambdaToBlockPointerConversion(SourceLocation CurrentLoc,
3849                                                     CXXConversionDecl *Conv);
3850 
3851   ExprResult BuildBlockForLambdaConversion(SourceLocation CurrentLocation,
3852                                            SourceLocation ConvLocation,
3853                                            CXXConversionDecl *Conv,
3854                                            Expr *Src);
3855 
3856   // ParseObjCStringLiteral - Parse Objective-C string literals.
3857   ExprResult ParseObjCStringLiteral(SourceLocation *AtLocs,
3858                                     Expr **Strings,
3859                                     unsigned NumStrings);
3860 
3861   ExprResult BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S);
3862 
3863   /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
3864   /// numeric literal expression. Type of the expression will be "NSNumber *"
3865   /// or "id" if NSNumber is unavailable.
3866   ExprResult BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number);
3867   ExprResult ActOnObjCBoolLiteral(SourceLocation AtLoc, SourceLocation ValueLoc,
3868                                   bool Value);
3869   ExprResult BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements);
3870 
3871   // BuildObjCBoxedExpr - builds an ObjCBoxedExpr AST node for the
3872   // '@' prefixed parenthesized expression. The type of the expression will
3873   // either be "NSNumber *" or "NSString *" depending on the type of
3874   // ValueType, which is allowed to be a built-in numeric type or
3875   // "char *" or "const char *".
3876   ExprResult BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr);
3877 
3878   ExprResult BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
3879                                           Expr *IndexExpr,
3880                                           ObjCMethodDecl *getterMethod,
3881                                           ObjCMethodDecl *setterMethod);
3882 
3883   ExprResult BuildObjCDictionaryLiteral(SourceRange SR,
3884                                         ObjCDictionaryElement *Elements,
3885                                         unsigned NumElements);
3886 
3887   ExprResult BuildObjCEncodeExpression(SourceLocation AtLoc,
3888                                   TypeSourceInfo *EncodedTypeInfo,
3889                                   SourceLocation RParenLoc);
3890   ExprResult BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl,
3891                                     CXXConversionDecl *Method,
3892                                     bool HadMultipleCandidates);
3893 
3894   ExprResult ParseObjCEncodeExpression(SourceLocation AtLoc,
3895                                        SourceLocation EncodeLoc,
3896                                        SourceLocation LParenLoc,
3897                                        ParsedType Ty,
3898                                        SourceLocation RParenLoc);
3899 
3900   // ParseObjCSelectorExpression - Build selector expression for @selector
3901   ExprResult ParseObjCSelectorExpression(Selector Sel,
3902                                          SourceLocation AtLoc,
3903                                          SourceLocation SelLoc,
3904                                          SourceLocation LParenLoc,
3905                                          SourceLocation RParenLoc);
3906 
3907   // ParseObjCProtocolExpression - Build protocol expression for @protocol
3908   ExprResult ParseObjCProtocolExpression(IdentifierInfo * ProtocolName,
3909                                          SourceLocation AtLoc,
3910                                          SourceLocation ProtoLoc,
3911                                          SourceLocation LParenLoc,
3912                                          SourceLocation RParenLoc);
3913 
3914   //===--------------------------------------------------------------------===//
3915   // C++ Declarations
3916   //
3917   Decl *ActOnStartLinkageSpecification(Scope *S,
3918                                        SourceLocation ExternLoc,
3919                                        SourceLocation LangLoc,
3920                                        StringRef Lang,
3921                                        SourceLocation LBraceLoc);
3922   Decl *ActOnFinishLinkageSpecification(Scope *S,
3923                                         Decl *LinkageSpec,
3924                                         SourceLocation RBraceLoc);
3925 
3926 
3927   //===--------------------------------------------------------------------===//
3928   // C++ Classes
3929   //
3930   bool isCurrentClassName(const IdentifierInfo &II, Scope *S,
3931                           const CXXScopeSpec *SS = 0);
3932 
3933   bool ActOnAccessSpecifier(AccessSpecifier Access,
3934                             SourceLocation ASLoc,
3935                             SourceLocation ColonLoc,
3936                             AttributeList *Attrs = 0);
3937 
3938   Decl *ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS,
3939                                  Declarator &D,
3940                                  MultiTemplateParamsArg TemplateParameterLists,
3941                                  Expr *BitfieldWidth, const VirtSpecifiers &VS,
3942                                  bool HasDeferredInit);
3943   void ActOnCXXInClassMemberInitializer(Decl *VarDecl, SourceLocation EqualLoc,
3944                                         Expr *Init);
3945 
3946   MemInitResult ActOnMemInitializer(Decl *ConstructorD,
3947                                     Scope *S,
3948                                     CXXScopeSpec &SS,
3949                                     IdentifierInfo *MemberOrBase,
3950                                     ParsedType TemplateTypeTy,
3951                                     const DeclSpec &DS,
3952                                     SourceLocation IdLoc,
3953                                     SourceLocation LParenLoc,
3954                                     Expr **Args, unsigned NumArgs,
3955                                     SourceLocation RParenLoc,
3956                                     SourceLocation EllipsisLoc);
3957 
3958   MemInitResult ActOnMemInitializer(Decl *ConstructorD,
3959                                     Scope *S,
3960                                     CXXScopeSpec &SS,
3961                                     IdentifierInfo *MemberOrBase,
3962                                     ParsedType TemplateTypeTy,
3963                                     const DeclSpec &DS,
3964                                     SourceLocation IdLoc,
3965                                     Expr *InitList,
3966                                     SourceLocation EllipsisLoc);
3967 
3968   MemInitResult BuildMemInitializer(Decl *ConstructorD,
3969                                     Scope *S,
3970                                     CXXScopeSpec &SS,
3971                                     IdentifierInfo *MemberOrBase,
3972                                     ParsedType TemplateTypeTy,
3973                                     const DeclSpec &DS,
3974                                     SourceLocation IdLoc,
3975                                     Expr *Init,
3976                                     SourceLocation EllipsisLoc);
3977 
3978   MemInitResult BuildMemberInitializer(ValueDecl *Member,
3979                                        Expr *Init,
3980                                        SourceLocation IdLoc);
3981 
3982   MemInitResult BuildBaseInitializer(QualType BaseType,
3983                                      TypeSourceInfo *BaseTInfo,
3984                                      Expr *Init,
3985                                      CXXRecordDecl *ClassDecl,
3986                                      SourceLocation EllipsisLoc);
3987 
3988   MemInitResult BuildDelegatingInitializer(TypeSourceInfo *TInfo,
3989                                            Expr *Init,
3990                                            CXXRecordDecl *ClassDecl);
3991 
3992   bool SetDelegatingInitializer(CXXConstructorDecl *Constructor,
3993                                 CXXCtorInitializer *Initializer);
3994 
3995   bool SetCtorInitializers(CXXConstructorDecl *Constructor,
3996                            CXXCtorInitializer **Initializers,
3997                            unsigned NumInitializers, bool AnyErrors);
3998 
3999   void SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation);
4000 
4001 
4002   /// MarkBaseAndMemberDestructorsReferenced - Given a record decl,
4003   /// mark all the non-trivial destructors of its members and bases as
4004   /// referenced.
4005   void MarkBaseAndMemberDestructorsReferenced(SourceLocation Loc,
4006                                               CXXRecordDecl *Record);
4007 
4008   /// \brief The list of classes whose vtables have been used within
4009   /// this translation unit, and the source locations at which the
4010   /// first use occurred.
4011   typedef std::pair<CXXRecordDecl*, SourceLocation> VTableUse;
4012 
4013   /// \brief The list of vtables that are required but have not yet been
4014   /// materialized.
4015   SmallVector<VTableUse, 16> VTableUses;
4016 
4017   /// \brief The set of classes whose vtables have been used within
4018   /// this translation unit, and a bit that will be true if the vtable is
4019   /// required to be emitted (otherwise, it should be emitted only if needed
4020   /// by code generation).
4021   llvm::DenseMap<CXXRecordDecl *, bool> VTablesUsed;
4022 
4023   /// \brief Load any externally-stored vtable uses.
4024   void LoadExternalVTableUses();
4025 
4026   typedef LazyVector<CXXRecordDecl *, ExternalSemaSource,
4027                      &ExternalSemaSource::ReadDynamicClasses, 2, 2>
4028     DynamicClassesType;
4029 
4030   /// \brief A list of all of the dynamic classes in this translation
4031   /// unit.
4032   DynamicClassesType DynamicClasses;
4033 
4034   /// \brief Note that the vtable for the given class was used at the
4035   /// given location.
4036   void MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class,
4037                       bool DefinitionRequired = false);
4038 
4039   /// MarkVirtualMembersReferenced - Will mark all members of the given
4040   /// CXXRecordDecl referenced.
4041   void MarkVirtualMembersReferenced(SourceLocation Loc,
4042                                     const CXXRecordDecl *RD);
4043 
4044   /// \brief Define all of the vtables that have been used in this
4045   /// translation unit and reference any virtual members used by those
4046   /// vtables.
4047   ///
4048   /// \returns true if any work was done, false otherwise.
4049   bool DefineUsedVTables();
4050 
4051   void AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl);
4052 
4053   void ActOnMemInitializers(Decl *ConstructorDecl,
4054                             SourceLocation ColonLoc,
4055                             CXXCtorInitializer **MemInits,
4056                             unsigned NumMemInits,
4057                             bool AnyErrors);
4058 
4059   void CheckCompletedCXXClass(CXXRecordDecl *Record);
4060   void ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc,
4061                                          Decl *TagDecl,
4062                                          SourceLocation LBrac,
4063                                          SourceLocation RBrac,
4064                                          AttributeList *AttrList);
4065 
4066   void ActOnReenterTemplateScope(Scope *S, Decl *Template);
4067   void ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D);
4068   void ActOnStartDelayedMemberDeclarations(Scope *S, Decl *Record);
4069   void ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
4070   void ActOnDelayedCXXMethodParameter(Scope *S, Decl *Param);
4071   void ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *Record);
4072   void ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *Method);
4073   void ActOnFinishDelayedMemberInitializers(Decl *Record);
4074   void MarkAsLateParsedTemplate(FunctionDecl *FD, bool Flag = true);
4075   bool IsInsideALocalClassWithinATemplateFunction();
4076 
4077   Decl *ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc,
4078                                      Expr *AssertExpr,
4079                                      Expr *AssertMessageExpr,
4080                                      SourceLocation RParenLoc);
4081 
4082   FriendDecl *CheckFriendTypeDecl(SourceLocation Loc,
4083                                   SourceLocation FriendLoc,
4084                                   TypeSourceInfo *TSInfo);
4085   Decl *ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS,
4086                             MultiTemplateParamsArg TemplateParams);
4087   Decl *ActOnFriendFunctionDecl(Scope *S, Declarator &D,
4088                                 MultiTemplateParamsArg TemplateParams);
4089 
4090   QualType CheckConstructorDeclarator(Declarator &D, QualType R,
4091                                       StorageClass& SC);
4092   void CheckConstructor(CXXConstructorDecl *Constructor);
4093   QualType CheckDestructorDeclarator(Declarator &D, QualType R,
4094                                      StorageClass& SC);
4095   bool CheckDestructor(CXXDestructorDecl *Destructor);
4096   void CheckConversionDeclarator(Declarator &D, QualType &R,
4097                                  StorageClass& SC);
4098   Decl *ActOnConversionDeclarator(CXXConversionDecl *Conversion);
4099 
4100   void CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record);
4101   void CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *Ctor);
4102   void CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *Ctor);
4103   void CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *Method);
4104   void CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *Ctor);
4105   void CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *Method);
4106   void CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *Dtor);
4107 
4108   //===--------------------------------------------------------------------===//
4109   // C++ Derived Classes
4110   //
4111 
4112   /// ActOnBaseSpecifier - Parsed a base specifier
4113   CXXBaseSpecifier *CheckBaseSpecifier(CXXRecordDecl *Class,
4114                                        SourceRange SpecifierRange,
4115                                        bool Virtual, AccessSpecifier Access,
4116                                        TypeSourceInfo *TInfo,
4117                                        SourceLocation EllipsisLoc);
4118 
4119   BaseResult ActOnBaseSpecifier(Decl *classdecl,
4120                                 SourceRange SpecifierRange,
4121                                 bool Virtual, AccessSpecifier Access,
4122                                 ParsedType basetype,
4123                                 SourceLocation BaseLoc,
4124                                 SourceLocation EllipsisLoc);
4125 
4126   bool AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
4127                             unsigned NumBases);
4128   void ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases,
4129                            unsigned NumBases);
4130 
4131   bool IsDerivedFrom(QualType Derived, QualType Base);
4132   bool IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths);
4133 
4134   // FIXME: I don't like this name.
4135   void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath);
4136 
4137   bool BasePathInvolvesVirtualBase(const CXXCastPath &BasePath);
4138 
4139   bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
4140                                     SourceLocation Loc, SourceRange Range,
4141                                     CXXCastPath *BasePath = 0,
4142                                     bool IgnoreAccess = false);
4143   bool CheckDerivedToBaseConversion(QualType Derived, QualType Base,
4144                                     unsigned InaccessibleBaseID,
4145                                     unsigned AmbigiousBaseConvID,
4146                                     SourceLocation Loc, SourceRange Range,
4147                                     DeclarationName Name,
4148                                     CXXCastPath *BasePath);
4149 
4150   std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths);
4151 
4152   /// CheckOverridingFunctionReturnType - Checks whether the return types are
4153   /// covariant, according to C++ [class.virtual]p5.
4154   bool CheckOverridingFunctionReturnType(const CXXMethodDecl *New,
4155                                          const CXXMethodDecl *Old);
4156 
4157   /// CheckOverridingFunctionExceptionSpec - Checks whether the exception
4158   /// spec is a subset of base spec.
4159   bool CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
4160                                             const CXXMethodDecl *Old);
4161 
4162   bool CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange);
4163 
4164   /// CheckOverrideControl - Check C++0x override control semantics.
4165   void CheckOverrideControl(const Decl *D);
4166 
4167   /// CheckForFunctionMarkedFinal - Checks whether a virtual member function
4168   /// overrides a virtual member function marked 'final', according to
4169   /// C++0x [class.virtual]p3.
4170   bool CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New,
4171                                               const CXXMethodDecl *Old);
4172 
4173 
4174   //===--------------------------------------------------------------------===//
4175   // C++ Access Control
4176   //
4177 
4178   enum AccessResult {
4179     AR_accessible,
4180     AR_inaccessible,
4181     AR_dependent,
4182     AR_delayed
4183   };
4184 
4185   bool SetMemberAccessSpecifier(NamedDecl *MemberDecl,
4186                                 NamedDecl *PrevMemberDecl,
4187                                 AccessSpecifier LexicalAS);
4188 
4189   AccessResult CheckUnresolvedMemberAccess(UnresolvedMemberExpr *E,
4190                                            DeclAccessPair FoundDecl);
4191   AccessResult CheckUnresolvedLookupAccess(UnresolvedLookupExpr *E,
4192                                            DeclAccessPair FoundDecl);
4193   AccessResult CheckAllocationAccess(SourceLocation OperatorLoc,
4194                                      SourceRange PlacementRange,
4195                                      CXXRecordDecl *NamingClass,
4196                                      DeclAccessPair FoundDecl,
4197                                      bool Diagnose = true);
4198   AccessResult CheckConstructorAccess(SourceLocation Loc,
4199                                       CXXConstructorDecl *D,
4200                                       const InitializedEntity &Entity,
4201                                       AccessSpecifier Access,
4202                                       bool IsCopyBindingRefToTemp = false);
4203   AccessResult CheckConstructorAccess(SourceLocation Loc,
4204                                       CXXConstructorDecl *D,
4205                                       const InitializedEntity &Entity,
4206                                       AccessSpecifier Access,
4207                                       const PartialDiagnostic &PDiag);
4208   AccessResult CheckDestructorAccess(SourceLocation Loc,
4209                                      CXXDestructorDecl *Dtor,
4210                                      const PartialDiagnostic &PDiag,
4211                                      QualType objectType = QualType());
4212   AccessResult CheckDirectMemberAccess(SourceLocation Loc,
4213                                        NamedDecl *D,
4214                                        const PartialDiagnostic &PDiag);
4215   AccessResult CheckMemberOperatorAccess(SourceLocation Loc,
4216                                          Expr *ObjectExpr,
4217                                          Expr *ArgExpr,
4218                                          DeclAccessPair FoundDecl);
4219   AccessResult CheckAddressOfMemberAccess(Expr *OvlExpr,
4220                                           DeclAccessPair FoundDecl);
4221   AccessResult CheckBaseClassAccess(SourceLocation AccessLoc,
4222                                     QualType Base, QualType Derived,
4223                                     const CXXBasePath &Path,
4224                                     unsigned DiagID,
4225                                     bool ForceCheck = false,
4226                                     bool ForceUnprivileged = false);
4227   void CheckLookupAccess(const LookupResult &R);
4228   bool IsSimplyAccessible(NamedDecl *decl, DeclContext *Ctx);
4229   bool isSpecialMemberAccessibleForDeletion(CXXMethodDecl *decl,
4230                                             AccessSpecifier access,
4231                                             QualType objectType);
4232 
4233   void HandleDependentAccessCheck(const DependentDiagnostic &DD,
4234                          const MultiLevelTemplateArgumentList &TemplateArgs);
4235   void PerformDependentDiagnostics(const DeclContext *Pattern,
4236                         const MultiLevelTemplateArgumentList &TemplateArgs);
4237 
4238   void HandleDelayedAccessCheck(sema::DelayedDiagnostic &DD, Decl *Ctx);
4239 
4240   /// A flag to suppress access checking.
4241   bool SuppressAccessChecking;
4242 
4243   /// \brief When true, access checking violations are treated as SFINAE
4244   /// failures rather than hard errors.
4245   bool AccessCheckingSFINAE;
4246 
4247   /// \brief RAII object used to temporarily suppress access checking.
4248   class SuppressAccessChecksRAII {
4249     Sema &S;
4250     bool SuppressingAccess;
4251 
4252   public:
SuppressAccessChecksRAII(Sema & S,bool Suppress)4253     SuppressAccessChecksRAII(Sema &S, bool Suppress)
4254       : S(S), SuppressingAccess(Suppress) {
4255       if (Suppress) S.ActOnStartSuppressingAccessChecks();
4256     }
~SuppressAccessChecksRAII()4257     ~SuppressAccessChecksRAII() {
4258       done();
4259     }
done()4260     void done() {
4261       if (!SuppressingAccess) return;
4262       S.ActOnStopSuppressingAccessChecks();
4263       SuppressingAccess = false;
4264     }
4265   };
4266 
4267   void ActOnStartSuppressingAccessChecks();
4268   void ActOnStopSuppressingAccessChecks();
4269 
4270   enum AbstractDiagSelID {
4271     AbstractNone = -1,
4272     AbstractReturnType,
4273     AbstractParamType,
4274     AbstractVariableType,
4275     AbstractFieldType,
4276     AbstractArrayType
4277   };
4278 
4279   bool RequireNonAbstractType(SourceLocation Loc, QualType T,
4280                               const PartialDiagnostic &PD);
4281   void DiagnoseAbstractType(const CXXRecordDecl *RD);
4282 
4283   bool RequireNonAbstractType(SourceLocation Loc, QualType T, unsigned DiagID,
4284                               AbstractDiagSelID SelID = AbstractNone);
4285 
4286   //===--------------------------------------------------------------------===//
4287   // C++ Overloaded Operators [C++ 13.5]
4288   //
4289 
4290   bool CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl);
4291 
4292   bool CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl);
4293 
4294   //===--------------------------------------------------------------------===//
4295   // C++ Templates [C++ 14]
4296   //
4297   void FilterAcceptableTemplateNames(LookupResult &R,
4298                                      bool AllowFunctionTemplates = true);
4299   bool hasAnyAcceptableTemplateNames(LookupResult &R,
4300                                      bool AllowFunctionTemplates = true);
4301 
4302   void LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS,
4303                           QualType ObjectType, bool EnteringContext,
4304                           bool &MemberOfUnknownSpecialization);
4305 
4306   TemplateNameKind isTemplateName(Scope *S,
4307                                   CXXScopeSpec &SS,
4308                                   bool hasTemplateKeyword,
4309                                   UnqualifiedId &Name,
4310                                   ParsedType ObjectType,
4311                                   bool EnteringContext,
4312                                   TemplateTy &Template,
4313                                   bool &MemberOfUnknownSpecialization);
4314 
4315   bool DiagnoseUnknownTemplateName(const IdentifierInfo &II,
4316                                    SourceLocation IILoc,
4317                                    Scope *S,
4318                                    const CXXScopeSpec *SS,
4319                                    TemplateTy &SuggestedTemplate,
4320                                    TemplateNameKind &SuggestedKind);
4321 
4322   void DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl);
4323   TemplateDecl *AdjustDeclIfTemplate(Decl *&Decl);
4324 
4325   Decl *ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
4326                            SourceLocation EllipsisLoc,
4327                            SourceLocation KeyLoc,
4328                            IdentifierInfo *ParamName,
4329                            SourceLocation ParamNameLoc,
4330                            unsigned Depth, unsigned Position,
4331                            SourceLocation EqualLoc,
4332                            ParsedType DefaultArg);
4333 
4334   QualType CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc);
4335   Decl *ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
4336                                       unsigned Depth,
4337                                       unsigned Position,
4338                                       SourceLocation EqualLoc,
4339                                       Expr *DefaultArg);
4340   Decl *ActOnTemplateTemplateParameter(Scope *S,
4341                                        SourceLocation TmpLoc,
4342                                        TemplateParameterList *Params,
4343                                        SourceLocation EllipsisLoc,
4344                                        IdentifierInfo *ParamName,
4345                                        SourceLocation ParamNameLoc,
4346                                        unsigned Depth,
4347                                        unsigned Position,
4348                                        SourceLocation EqualLoc,
4349                                        ParsedTemplateArgument DefaultArg);
4350 
4351   TemplateParameterList *
4352   ActOnTemplateParameterList(unsigned Depth,
4353                              SourceLocation ExportLoc,
4354                              SourceLocation TemplateLoc,
4355                              SourceLocation LAngleLoc,
4356                              Decl **Params, unsigned NumParams,
4357                              SourceLocation RAngleLoc);
4358 
4359   /// \brief The context in which we are checking a template parameter
4360   /// list.
4361   enum TemplateParamListContext {
4362     TPC_ClassTemplate,
4363     TPC_FunctionTemplate,
4364     TPC_ClassTemplateMember,
4365     TPC_FriendFunctionTemplate,
4366     TPC_FriendFunctionTemplateDefinition,
4367     TPC_TypeAliasTemplate
4368   };
4369 
4370   bool CheckTemplateParameterList(TemplateParameterList *NewParams,
4371                                   TemplateParameterList *OldParams,
4372                                   TemplateParamListContext TPC);
4373   TemplateParameterList *
4374   MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
4375                                           SourceLocation DeclLoc,
4376                                           const CXXScopeSpec &SS,
4377                                           TemplateParameterList **ParamLists,
4378                                           unsigned NumParamLists,
4379                                           bool IsFriend,
4380                                           bool &IsExplicitSpecialization,
4381                                           bool &Invalid);
4382 
4383   DeclResult CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
4384                                 SourceLocation KWLoc, CXXScopeSpec &SS,
4385                                 IdentifierInfo *Name, SourceLocation NameLoc,
4386                                 AttributeList *Attr,
4387                                 TemplateParameterList *TemplateParams,
4388                                 AccessSpecifier AS,
4389                                 SourceLocation ModulePrivateLoc,
4390                                 unsigned NumOuterTemplateParamLists,
4391                             TemplateParameterList **OuterTemplateParamLists);
4392 
4393   void translateTemplateArguments(const ASTTemplateArgsPtr &In,
4394                                   TemplateArgumentListInfo &Out);
4395 
4396   void NoteAllFoundTemplates(TemplateName Name);
4397 
4398   QualType CheckTemplateIdType(TemplateName Template,
4399                                SourceLocation TemplateLoc,
4400                               TemplateArgumentListInfo &TemplateArgs);
4401 
4402   TypeResult
4403   ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
4404                       TemplateTy Template, SourceLocation TemplateLoc,
4405                       SourceLocation LAngleLoc,
4406                       ASTTemplateArgsPtr TemplateArgs,
4407                       SourceLocation RAngleLoc,
4408                       bool IsCtorOrDtorName = false);
4409 
4410   /// \brief Parsed an elaborated-type-specifier that refers to a template-id,
4411   /// such as \c class T::template apply<U>.
4412   ///
4413   /// \param TUK
4414   TypeResult ActOnTagTemplateIdType(TagUseKind TUK,
4415                                     TypeSpecifierType TagSpec,
4416                                     SourceLocation TagLoc,
4417                                     CXXScopeSpec &SS,
4418                                     SourceLocation TemplateKWLoc,
4419                                     TemplateTy TemplateD,
4420                                     SourceLocation TemplateLoc,
4421                                     SourceLocation LAngleLoc,
4422                                     ASTTemplateArgsPtr TemplateArgsIn,
4423                                     SourceLocation RAngleLoc);
4424 
4425 
4426   ExprResult BuildTemplateIdExpr(const CXXScopeSpec &SS,
4427                                  SourceLocation TemplateKWLoc,
4428                                  LookupResult &R,
4429                                  bool RequiresADL,
4430                                const TemplateArgumentListInfo *TemplateArgs);
4431 
4432   ExprResult BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
4433                                           SourceLocation TemplateKWLoc,
4434                                const DeclarationNameInfo &NameInfo,
4435                                const TemplateArgumentListInfo *TemplateArgs);
4436 
4437   TemplateNameKind ActOnDependentTemplateName(Scope *S,
4438                                               CXXScopeSpec &SS,
4439                                               SourceLocation TemplateKWLoc,
4440                                               UnqualifiedId &Name,
4441                                               ParsedType ObjectType,
4442                                               bool EnteringContext,
4443                                               TemplateTy &Template);
4444 
4445   DeclResult
4446   ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec, TagUseKind TUK,
4447                                    SourceLocation KWLoc,
4448                                    SourceLocation ModulePrivateLoc,
4449                                    CXXScopeSpec &SS,
4450                                    TemplateTy Template,
4451                                    SourceLocation TemplateNameLoc,
4452                                    SourceLocation LAngleLoc,
4453                                    ASTTemplateArgsPtr TemplateArgs,
4454                                    SourceLocation RAngleLoc,
4455                                    AttributeList *Attr,
4456                                  MultiTemplateParamsArg TemplateParameterLists);
4457 
4458   Decl *ActOnTemplateDeclarator(Scope *S,
4459                                 MultiTemplateParamsArg TemplateParameterLists,
4460                                 Declarator &D);
4461 
4462   Decl *ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
4463                                   MultiTemplateParamsArg TemplateParameterLists,
4464                                         Declarator &D);
4465 
4466   bool
4467   CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
4468                                          TemplateSpecializationKind NewTSK,
4469                                          NamedDecl *PrevDecl,
4470                                          TemplateSpecializationKind PrevTSK,
4471                                          SourceLocation PrevPtOfInstantiation,
4472                                          bool &SuppressNew);
4473 
4474   bool CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
4475                     const TemplateArgumentListInfo &ExplicitTemplateArgs,
4476                                                     LookupResult &Previous);
4477 
4478   bool CheckFunctionTemplateSpecialization(FunctionDecl *FD,
4479                          TemplateArgumentListInfo *ExplicitTemplateArgs,
4480                                            LookupResult &Previous);
4481   bool CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous);
4482 
4483   DeclResult
4484   ActOnExplicitInstantiation(Scope *S,
4485                              SourceLocation ExternLoc,
4486                              SourceLocation TemplateLoc,
4487                              unsigned TagSpec,
4488                              SourceLocation KWLoc,
4489                              const CXXScopeSpec &SS,
4490                              TemplateTy Template,
4491                              SourceLocation TemplateNameLoc,
4492                              SourceLocation LAngleLoc,
4493                              ASTTemplateArgsPtr TemplateArgs,
4494                              SourceLocation RAngleLoc,
4495                              AttributeList *Attr);
4496 
4497   DeclResult
4498   ActOnExplicitInstantiation(Scope *S,
4499                              SourceLocation ExternLoc,
4500                              SourceLocation TemplateLoc,
4501                              unsigned TagSpec,
4502                              SourceLocation KWLoc,
4503                              CXXScopeSpec &SS,
4504                              IdentifierInfo *Name,
4505                              SourceLocation NameLoc,
4506                              AttributeList *Attr);
4507 
4508   DeclResult ActOnExplicitInstantiation(Scope *S,
4509                                         SourceLocation ExternLoc,
4510                                         SourceLocation TemplateLoc,
4511                                         Declarator &D);
4512 
4513   TemplateArgumentLoc
4514   SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
4515                                           SourceLocation TemplateLoc,
4516                                           SourceLocation RAngleLoc,
4517                                           Decl *Param,
4518                           SmallVectorImpl<TemplateArgument> &Converted);
4519 
4520   /// \brief Specifies the context in which a particular template
4521   /// argument is being checked.
4522   enum CheckTemplateArgumentKind {
4523     /// \brief The template argument was specified in the code or was
4524     /// instantiated with some deduced template arguments.
4525     CTAK_Specified,
4526 
4527     /// \brief The template argument was deduced via template argument
4528     /// deduction.
4529     CTAK_Deduced,
4530 
4531     /// \brief The template argument was deduced from an array bound
4532     /// via template argument deduction.
4533     CTAK_DeducedFromArrayBound
4534   };
4535 
4536   bool CheckTemplateArgument(NamedDecl *Param,
4537                              const TemplateArgumentLoc &Arg,
4538                              NamedDecl *Template,
4539                              SourceLocation TemplateLoc,
4540                              SourceLocation RAngleLoc,
4541                              unsigned ArgumentPackIndex,
4542                            SmallVectorImpl<TemplateArgument> &Converted,
4543                              CheckTemplateArgumentKind CTAK = CTAK_Specified);
4544 
4545   /// \brief Check that the given template arguments can be be provided to
4546   /// the given template, converting the arguments along the way.
4547   ///
4548   /// \param Template The template to which the template arguments are being
4549   /// provided.
4550   ///
4551   /// \param TemplateLoc The location of the template name in the source.
4552   ///
4553   /// \param TemplateArgs The list of template arguments. If the template is
4554   /// a template template parameter, this function may extend the set of
4555   /// template arguments to also include substituted, defaulted template
4556   /// arguments.
4557   ///
4558   /// \param PartialTemplateArgs True if the list of template arguments is
4559   /// intentionally partial, e.g., because we're checking just the initial
4560   /// set of template arguments.
4561   ///
4562   /// \param Converted Will receive the converted, canonicalized template
4563   /// arguments.
4564   ///
4565   ///
4566   /// \param ExpansionIntoFixedList If non-NULL, will be set true to indicate
4567   /// when the template arguments contain a pack expansion that is being
4568   /// expanded into a fixed parameter list.
4569   ///
4570   /// \returns True if an error occurred, false otherwise.
4571   bool CheckTemplateArgumentList(TemplateDecl *Template,
4572                                  SourceLocation TemplateLoc,
4573                                  TemplateArgumentListInfo &TemplateArgs,
4574                                  bool PartialTemplateArgs,
4575                            SmallVectorImpl<TemplateArgument> &Converted,
4576                                  bool *ExpansionIntoFixedList = 0);
4577 
4578   bool CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
4579                                  const TemplateArgumentLoc &Arg,
4580                            SmallVectorImpl<TemplateArgument> &Converted);
4581 
4582   bool CheckTemplateArgument(TemplateTypeParmDecl *Param,
4583                              TypeSourceInfo *Arg);
4584   ExprResult CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
4585                                    QualType InstantiatedParamType, Expr *Arg,
4586                                    TemplateArgument &Converted,
4587                                CheckTemplateArgumentKind CTAK = CTAK_Specified);
4588   bool CheckTemplateArgument(TemplateTemplateParmDecl *Param,
4589                              const TemplateArgumentLoc &Arg);
4590 
4591   ExprResult
4592   BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
4593                                           QualType ParamType,
4594                                           SourceLocation Loc);
4595   ExprResult
4596   BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
4597                                               SourceLocation Loc);
4598 
4599   /// \brief Enumeration describing how template parameter lists are compared
4600   /// for equality.
4601   enum TemplateParameterListEqualKind {
4602     /// \brief We are matching the template parameter lists of two templates
4603     /// that might be redeclarations.
4604     ///
4605     /// \code
4606     /// template<typename T> struct X;
4607     /// template<typename T> struct X;
4608     /// \endcode
4609     TPL_TemplateMatch,
4610 
4611     /// \brief We are matching the template parameter lists of two template
4612     /// template parameters as part of matching the template parameter lists
4613     /// of two templates that might be redeclarations.
4614     ///
4615     /// \code
4616     /// template<template<int I> class TT> struct X;
4617     /// template<template<int Value> class Other> struct X;
4618     /// \endcode
4619     TPL_TemplateTemplateParmMatch,
4620 
4621     /// \brief We are matching the template parameter lists of a template
4622     /// template argument against the template parameter lists of a template
4623     /// template parameter.
4624     ///
4625     /// \code
4626     /// template<template<int Value> class Metafun> struct X;
4627     /// template<int Value> struct integer_c;
4628     /// X<integer_c> xic;
4629     /// \endcode
4630     TPL_TemplateTemplateArgumentMatch
4631   };
4632 
4633   bool TemplateParameterListsAreEqual(TemplateParameterList *New,
4634                                       TemplateParameterList *Old,
4635                                       bool Complain,
4636                                       TemplateParameterListEqualKind Kind,
4637                                       SourceLocation TemplateArgLoc
4638                                         = SourceLocation());
4639 
4640   bool CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams);
4641 
4642   /// \brief Called when the parser has parsed a C++ typename
4643   /// specifier, e.g., "typename T::type".
4644   ///
4645   /// \param S The scope in which this typename type occurs.
4646   /// \param TypenameLoc the location of the 'typename' keyword
4647   /// \param SS the nested-name-specifier following the typename (e.g., 'T::').
4648   /// \param II the identifier we're retrieving (e.g., 'type' in the example).
4649   /// \param IdLoc the location of the identifier.
4650   TypeResult
4651   ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
4652                     const CXXScopeSpec &SS, const IdentifierInfo &II,
4653                     SourceLocation IdLoc);
4654 
4655   /// \brief Called when the parser has parsed a C++ typename
4656   /// specifier that ends in a template-id, e.g.,
4657   /// "typename MetaFun::template apply<T1, T2>".
4658   ///
4659   /// \param S The scope in which this typename type occurs.
4660   /// \param TypenameLoc the location of the 'typename' keyword
4661   /// \param SS the nested-name-specifier following the typename (e.g., 'T::').
4662   /// \param TemplateLoc the location of the 'template' keyword, if any.
4663   /// \param TemplateName The template name.
4664   /// \param TemplateNameLoc The location of the template name.
4665   /// \param LAngleLoc The location of the opening angle bracket  ('<').
4666   /// \param TemplateArgs The template arguments.
4667   /// \param RAngleLoc The location of the closing angle bracket  ('>').
4668   TypeResult
4669   ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
4670                     const CXXScopeSpec &SS,
4671                     SourceLocation TemplateLoc,
4672                     TemplateTy Template,
4673                     SourceLocation TemplateNameLoc,
4674                     SourceLocation LAngleLoc,
4675                     ASTTemplateArgsPtr TemplateArgs,
4676                     SourceLocation RAngleLoc);
4677 
4678   QualType CheckTypenameType(ElaboratedTypeKeyword Keyword,
4679                              SourceLocation KeywordLoc,
4680                              NestedNameSpecifierLoc QualifierLoc,
4681                              const IdentifierInfo &II,
4682                              SourceLocation IILoc);
4683 
4684   TypeSourceInfo *RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
4685                                                     SourceLocation Loc,
4686                                                     DeclarationName Name);
4687   bool RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS);
4688 
4689   ExprResult RebuildExprInCurrentInstantiation(Expr *E);
4690   bool RebuildTemplateParamsInCurrentInstantiation(
4691                                                 TemplateParameterList *Params);
4692 
4693   std::string
4694   getTemplateArgumentBindingsText(const TemplateParameterList *Params,
4695                                   const TemplateArgumentList &Args);
4696 
4697   std::string
4698   getTemplateArgumentBindingsText(const TemplateParameterList *Params,
4699                                   const TemplateArgument *Args,
4700                                   unsigned NumArgs);
4701 
4702   //===--------------------------------------------------------------------===//
4703   // C++ Variadic Templates (C++0x [temp.variadic])
4704   //===--------------------------------------------------------------------===//
4705 
4706   /// \brief The context in which an unexpanded parameter pack is
4707   /// being diagnosed.
4708   ///
4709   /// Note that the values of this enumeration line up with the first
4710   /// argument to the \c err_unexpanded_parameter_pack diagnostic.
4711   enum UnexpandedParameterPackContext {
4712     /// \brief An arbitrary expression.
4713     UPPC_Expression = 0,
4714 
4715     /// \brief The base type of a class type.
4716     UPPC_BaseType,
4717 
4718     /// \brief The type of an arbitrary declaration.
4719     UPPC_DeclarationType,
4720 
4721     /// \brief The type of a data member.
4722     UPPC_DataMemberType,
4723 
4724     /// \brief The size of a bit-field.
4725     UPPC_BitFieldWidth,
4726 
4727     /// \brief The expression in a static assertion.
4728     UPPC_StaticAssertExpression,
4729 
4730     /// \brief The fixed underlying type of an enumeration.
4731     UPPC_FixedUnderlyingType,
4732 
4733     /// \brief The enumerator value.
4734     UPPC_EnumeratorValue,
4735 
4736     /// \brief A using declaration.
4737     UPPC_UsingDeclaration,
4738 
4739     /// \brief A friend declaration.
4740     UPPC_FriendDeclaration,
4741 
4742     /// \brief A declaration qualifier.
4743     UPPC_DeclarationQualifier,
4744 
4745     /// \brief An initializer.
4746     UPPC_Initializer,
4747 
4748     /// \brief A default argument.
4749     UPPC_DefaultArgument,
4750 
4751     /// \brief The type of a non-type template parameter.
4752     UPPC_NonTypeTemplateParameterType,
4753 
4754     /// \brief The type of an exception.
4755     UPPC_ExceptionType,
4756 
4757     /// \brief Partial specialization.
4758     UPPC_PartialSpecialization,
4759 
4760     /// \brief Microsoft __if_exists.
4761     UPPC_IfExists,
4762 
4763     /// \brief Microsoft __if_not_exists.
4764     UPPC_IfNotExists
4765 };
4766 
4767   /// \brief Diagnose unexpanded parameter packs.
4768   ///
4769   /// \param Loc The location at which we should emit the diagnostic.
4770   ///
4771   /// \param UPPC The context in which we are diagnosing unexpanded
4772   /// parameter packs.
4773   ///
4774   /// \param Unexpanded the set of unexpanded parameter packs.
4775   void DiagnoseUnexpandedParameterPacks(SourceLocation Loc,
4776                                         UnexpandedParameterPackContext UPPC,
4777                                   ArrayRef<UnexpandedParameterPack> Unexpanded);
4778 
4779   /// \brief If the given type contains an unexpanded parameter pack,
4780   /// diagnose the error.
4781   ///
4782   /// \param Loc The source location where a diagnostc should be emitted.
4783   ///
4784   /// \param T The type that is being checked for unexpanded parameter
4785   /// packs.
4786   ///
4787   /// \returns true if an error occurred, false otherwise.
4788   bool DiagnoseUnexpandedParameterPack(SourceLocation Loc, TypeSourceInfo *T,
4789                                        UnexpandedParameterPackContext UPPC);
4790 
4791   /// \brief If the given expression contains an unexpanded parameter
4792   /// pack, diagnose the error.
4793   ///
4794   /// \param E The expression that is being checked for unexpanded
4795   /// parameter packs.
4796   ///
4797   /// \returns true if an error occurred, false otherwise.
4798   bool DiagnoseUnexpandedParameterPack(Expr *E,
4799                        UnexpandedParameterPackContext UPPC = UPPC_Expression);
4800 
4801   /// \brief If the given nested-name-specifier contains an unexpanded
4802   /// parameter pack, diagnose the error.
4803   ///
4804   /// \param SS The nested-name-specifier that is being checked for
4805   /// unexpanded parameter packs.
4806   ///
4807   /// \returns true if an error occurred, false otherwise.
4808   bool DiagnoseUnexpandedParameterPack(const CXXScopeSpec &SS,
4809                                        UnexpandedParameterPackContext UPPC);
4810 
4811   /// \brief If the given name contains an unexpanded parameter pack,
4812   /// diagnose the error.
4813   ///
4814   /// \param NameInfo The name (with source location information) that
4815   /// is being checked for unexpanded parameter packs.
4816   ///
4817   /// \returns true if an error occurred, false otherwise.
4818   bool DiagnoseUnexpandedParameterPack(const DeclarationNameInfo &NameInfo,
4819                                        UnexpandedParameterPackContext UPPC);
4820 
4821   /// \brief If the given template name contains an unexpanded parameter pack,
4822   /// diagnose the error.
4823   ///
4824   /// \param Loc The location of the template name.
4825   ///
4826   /// \param Template The template name that is being checked for unexpanded
4827   /// parameter packs.
4828   ///
4829   /// \returns true if an error occurred, false otherwise.
4830   bool DiagnoseUnexpandedParameterPack(SourceLocation Loc,
4831                                        TemplateName Template,
4832                                        UnexpandedParameterPackContext UPPC);
4833 
4834   /// \brief If the given template argument contains an unexpanded parameter
4835   /// pack, diagnose the error.
4836   ///
4837   /// \param Arg The template argument that is being checked for unexpanded
4838   /// parameter packs.
4839   ///
4840   /// \returns true if an error occurred, false otherwise.
4841   bool DiagnoseUnexpandedParameterPack(TemplateArgumentLoc Arg,
4842                                        UnexpandedParameterPackContext UPPC);
4843 
4844   /// \brief Collect the set of unexpanded parameter packs within the given
4845   /// template argument.
4846   ///
4847   /// \param Arg The template argument that will be traversed to find
4848   /// unexpanded parameter packs.
4849   void collectUnexpandedParameterPacks(TemplateArgument Arg,
4850                    SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4851 
4852   /// \brief Collect the set of unexpanded parameter packs within the given
4853   /// template argument.
4854   ///
4855   /// \param Arg The template argument that will be traversed to find
4856   /// unexpanded parameter packs.
4857   void collectUnexpandedParameterPacks(TemplateArgumentLoc Arg,
4858                     SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4859 
4860   /// \brief Collect the set of unexpanded parameter packs within the given
4861   /// type.
4862   ///
4863   /// \param T The type that will be traversed to find
4864   /// unexpanded parameter packs.
4865   void collectUnexpandedParameterPacks(QualType T,
4866                    SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4867 
4868   /// \brief Collect the set of unexpanded parameter packs within the given
4869   /// type.
4870   ///
4871   /// \param TL The type that will be traversed to find
4872   /// unexpanded parameter packs.
4873   void collectUnexpandedParameterPacks(TypeLoc TL,
4874                    SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4875 
4876   /// \brief Collect the set of unexpanded parameter packs within the given
4877   /// nested-name-specifier.
4878   ///
4879   /// \param SS The nested-name-specifier that will be traversed to find
4880   /// unexpanded parameter packs.
4881   void collectUnexpandedParameterPacks(CXXScopeSpec &SS,
4882                          SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4883 
4884   /// \brief Collect the set of unexpanded parameter packs within the given
4885   /// name.
4886   ///
4887   /// \param NameInfo The name that will be traversed to find
4888   /// unexpanded parameter packs.
4889   void collectUnexpandedParameterPacks(const DeclarationNameInfo &NameInfo,
4890                          SmallVectorImpl<UnexpandedParameterPack> &Unexpanded);
4891 
4892   /// \brief Invoked when parsing a template argument followed by an
4893   /// ellipsis, which creates a pack expansion.
4894   ///
4895   /// \param Arg The template argument preceding the ellipsis, which
4896   /// may already be invalid.
4897   ///
4898   /// \param EllipsisLoc The location of the ellipsis.
4899   ParsedTemplateArgument ActOnPackExpansion(const ParsedTemplateArgument &Arg,
4900                                             SourceLocation EllipsisLoc);
4901 
4902   /// \brief Invoked when parsing a type followed by an ellipsis, which
4903   /// creates a pack expansion.
4904   ///
4905   /// \param Type The type preceding the ellipsis, which will become
4906   /// the pattern of the pack expansion.
4907   ///
4908   /// \param EllipsisLoc The location of the ellipsis.
4909   TypeResult ActOnPackExpansion(ParsedType Type, SourceLocation EllipsisLoc);
4910 
4911   /// \brief Construct a pack expansion type from the pattern of the pack
4912   /// expansion.
4913   TypeSourceInfo *CheckPackExpansion(TypeSourceInfo *Pattern,
4914                                      SourceLocation EllipsisLoc,
4915                                      llvm::Optional<unsigned> NumExpansions);
4916 
4917   /// \brief Construct a pack expansion type from the pattern of the pack
4918   /// expansion.
4919   QualType CheckPackExpansion(QualType Pattern,
4920                               SourceRange PatternRange,
4921                               SourceLocation EllipsisLoc,
4922                               llvm::Optional<unsigned> NumExpansions);
4923 
4924   /// \brief Invoked when parsing an expression followed by an ellipsis, which
4925   /// creates a pack expansion.
4926   ///
4927   /// \param Pattern The expression preceding the ellipsis, which will become
4928   /// the pattern of the pack expansion.
4929   ///
4930   /// \param EllipsisLoc The location of the ellipsis.
4931   ExprResult ActOnPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc);
4932 
4933   /// \brief Invoked when parsing an expression followed by an ellipsis, which
4934   /// creates a pack expansion.
4935   ///
4936   /// \param Pattern The expression preceding the ellipsis, which will become
4937   /// the pattern of the pack expansion.
4938   ///
4939   /// \param EllipsisLoc The location of the ellipsis.
4940   ExprResult CheckPackExpansion(Expr *Pattern, SourceLocation EllipsisLoc,
4941                                 llvm::Optional<unsigned> NumExpansions);
4942 
4943   /// \brief Determine whether we could expand a pack expansion with the
4944   /// given set of parameter packs into separate arguments by repeatedly
4945   /// transforming the pattern.
4946   ///
4947   /// \param EllipsisLoc The location of the ellipsis that identifies the
4948   /// pack expansion.
4949   ///
4950   /// \param PatternRange The source range that covers the entire pattern of
4951   /// the pack expansion.
4952   ///
4953   /// \param Unexpanded The set of unexpanded parameter packs within the
4954   /// pattern.
4955   ///
4956   /// \param NumUnexpanded The number of unexpanded parameter packs in
4957   /// \p Unexpanded.
4958   ///
4959   /// \param ShouldExpand Will be set to \c true if the transformer should
4960   /// expand the corresponding pack expansions into separate arguments. When
4961   /// set, \c NumExpansions must also be set.
4962   ///
4963   /// \param RetainExpansion Whether the caller should add an unexpanded
4964   /// pack expansion after all of the expanded arguments. This is used
4965   /// when extending explicitly-specified template argument packs per
4966   /// C++0x [temp.arg.explicit]p9.
4967   ///
4968   /// \param NumExpansions The number of separate arguments that will be in
4969   /// the expanded form of the corresponding pack expansion. This is both an
4970   /// input and an output parameter, which can be set by the caller if the
4971   /// number of expansions is known a priori (e.g., due to a prior substitution)
4972   /// and will be set by the callee when the number of expansions is known.
4973   /// The callee must set this value when \c ShouldExpand is \c true; it may
4974   /// set this value in other cases.
4975   ///
4976   /// \returns true if an error occurred (e.g., because the parameter packs
4977   /// are to be instantiated with arguments of different lengths), false
4978   /// otherwise. If false, \c ShouldExpand (and possibly \c NumExpansions)
4979   /// must be set.
4980   bool CheckParameterPacksForExpansion(SourceLocation EllipsisLoc,
4981                                        SourceRange PatternRange,
4982                              llvm::ArrayRef<UnexpandedParameterPack> Unexpanded,
4983                              const MultiLevelTemplateArgumentList &TemplateArgs,
4984                                        bool &ShouldExpand,
4985                                        bool &RetainExpansion,
4986                                        llvm::Optional<unsigned> &NumExpansions);
4987 
4988   /// \brief Determine the number of arguments in the given pack expansion
4989   /// type.
4990   ///
4991   /// This routine already assumes that the pack expansion type can be
4992   /// expanded and that the number of arguments in the expansion is
4993   /// consistent across all of the unexpanded parameter packs in its pattern.
4994   unsigned getNumArgumentsInExpansion(QualType T,
4995                             const MultiLevelTemplateArgumentList &TemplateArgs);
4996 
4997   /// \brief Determine whether the given declarator contains any unexpanded
4998   /// parameter packs.
4999   ///
5000   /// This routine is used by the parser to disambiguate function declarators
5001   /// with an ellipsis prior to the ')', e.g.,
5002   ///
5003   /// \code
5004   ///   void f(T...);
5005   /// \endcode
5006   ///
5007   /// To determine whether we have an (unnamed) function parameter pack or
5008   /// a variadic function.
5009   ///
5010   /// \returns true if the declarator contains any unexpanded parameter packs,
5011   /// false otherwise.
5012   bool containsUnexpandedParameterPacks(Declarator &D);
5013 
5014   //===--------------------------------------------------------------------===//
5015   // C++ Template Argument Deduction (C++ [temp.deduct])
5016   //===--------------------------------------------------------------------===//
5017 
5018   /// \brief Describes the result of template argument deduction.
5019   ///
5020   /// The TemplateDeductionResult enumeration describes the result of
5021   /// template argument deduction, as returned from
5022   /// DeduceTemplateArguments(). The separate TemplateDeductionInfo
5023   /// structure provides additional information about the results of
5024   /// template argument deduction, e.g., the deduced template argument
5025   /// list (if successful) or the specific template parameters or
5026   /// deduced arguments that were involved in the failure.
5027   enum TemplateDeductionResult {
5028     /// \brief Template argument deduction was successful.
5029     TDK_Success = 0,
5030     /// \brief Template argument deduction exceeded the maximum template
5031     /// instantiation depth (which has already been diagnosed).
5032     TDK_InstantiationDepth,
5033     /// \brief Template argument deduction did not deduce a value
5034     /// for every template parameter.
5035     TDK_Incomplete,
5036     /// \brief Template argument deduction produced inconsistent
5037     /// deduced values for the given template parameter.
5038     TDK_Inconsistent,
5039     /// \brief Template argument deduction failed due to inconsistent
5040     /// cv-qualifiers on a template parameter type that would
5041     /// otherwise be deduced, e.g., we tried to deduce T in "const T"
5042     /// but were given a non-const "X".
5043     TDK_Underqualified,
5044     /// \brief Substitution of the deduced template argument values
5045     /// resulted in an error.
5046     TDK_SubstitutionFailure,
5047     /// \brief Substitution of the deduced template argument values
5048     /// into a non-deduced context produced a type or value that
5049     /// produces a type that does not match the original template
5050     /// arguments provided.
5051     TDK_NonDeducedMismatch,
5052     /// \brief When performing template argument deduction for a function
5053     /// template, there were too many call arguments.
5054     TDK_TooManyArguments,
5055     /// \brief When performing template argument deduction for a function
5056     /// template, there were too few call arguments.
5057     TDK_TooFewArguments,
5058     /// \brief The explicitly-specified template arguments were not valid
5059     /// template arguments for the given template.
5060     TDK_InvalidExplicitArguments,
5061     /// \brief The arguments included an overloaded function name that could
5062     /// not be resolved to a suitable function.
5063     TDK_FailedOverloadResolution
5064   };
5065 
5066   TemplateDeductionResult
5067   DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
5068                           const TemplateArgumentList &TemplateArgs,
5069                           sema::TemplateDeductionInfo &Info);
5070 
5071   TemplateDeductionResult
5072   SubstituteExplicitTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
5073                               TemplateArgumentListInfo &ExplicitTemplateArgs,
5074                       SmallVectorImpl<DeducedTemplateArgument> &Deduced,
5075                                  SmallVectorImpl<QualType> &ParamTypes,
5076                                       QualType *FunctionType,
5077                                       sema::TemplateDeductionInfo &Info);
5078 
5079   /// brief A function argument from which we performed template argument
5080   // deduction for a call.
5081   struct OriginalCallArg {
OriginalCallArgOriginalCallArg5082     OriginalCallArg(QualType OriginalParamType,
5083                     unsigned ArgIdx,
5084                     QualType OriginalArgType)
5085       : OriginalParamType(OriginalParamType), ArgIdx(ArgIdx),
5086         OriginalArgType(OriginalArgType) { }
5087 
5088     QualType OriginalParamType;
5089     unsigned ArgIdx;
5090     QualType OriginalArgType;
5091   };
5092 
5093   TemplateDeductionResult
5094   FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate,
5095                       SmallVectorImpl<DeducedTemplateArgument> &Deduced,
5096                                   unsigned NumExplicitlySpecified,
5097                                   FunctionDecl *&Specialization,
5098                                   sema::TemplateDeductionInfo &Info,
5099            SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs = 0);
5100 
5101   TemplateDeductionResult
5102   DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
5103                           TemplateArgumentListInfo *ExplicitTemplateArgs,
5104                           llvm::ArrayRef<Expr *> Args,
5105                           FunctionDecl *&Specialization,
5106                           sema::TemplateDeductionInfo &Info);
5107 
5108   TemplateDeductionResult
5109   DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
5110                           TemplateArgumentListInfo *ExplicitTemplateArgs,
5111                           QualType ArgFunctionType,
5112                           FunctionDecl *&Specialization,
5113                           sema::TemplateDeductionInfo &Info);
5114 
5115   TemplateDeductionResult
5116   DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
5117                           QualType ToType,
5118                           CXXConversionDecl *&Specialization,
5119                           sema::TemplateDeductionInfo &Info);
5120 
5121   TemplateDeductionResult
5122   DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate,
5123                           TemplateArgumentListInfo *ExplicitTemplateArgs,
5124                           FunctionDecl *&Specialization,
5125                           sema::TemplateDeductionInfo &Info);
5126 
5127   /// \brief Result type of DeduceAutoType.
5128   enum DeduceAutoResult {
5129     DAR_Succeeded,
5130     DAR_Failed,
5131     DAR_FailedAlreadyDiagnosed
5132   };
5133 
5134   DeduceAutoResult DeduceAutoType(TypeSourceInfo *AutoType, Expr *&Initializer,
5135                                   TypeSourceInfo *&Result);
5136   void DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init);
5137 
5138   FunctionTemplateDecl *getMoreSpecializedTemplate(FunctionTemplateDecl *FT1,
5139                                                    FunctionTemplateDecl *FT2,
5140                                                    SourceLocation Loc,
5141                                            TemplatePartialOrderingContext TPOC,
5142                                                    unsigned NumCallArguments);
5143   UnresolvedSetIterator getMostSpecialized(UnresolvedSetIterator SBegin,
5144                                            UnresolvedSetIterator SEnd,
5145                                            TemplatePartialOrderingContext TPOC,
5146                                            unsigned NumCallArguments,
5147                                            SourceLocation Loc,
5148                                            const PartialDiagnostic &NoneDiag,
5149                                            const PartialDiagnostic &AmbigDiag,
5150                                         const PartialDiagnostic &CandidateDiag,
5151                                         bool Complain = true,
5152                                         QualType TargetType = QualType());
5153 
5154   ClassTemplatePartialSpecializationDecl *
5155   getMoreSpecializedPartialSpecialization(
5156                                   ClassTemplatePartialSpecializationDecl *PS1,
5157                                   ClassTemplatePartialSpecializationDecl *PS2,
5158                                   SourceLocation Loc);
5159 
5160   void MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs,
5161                                   bool OnlyDeduced,
5162                                   unsigned Depth,
5163                                   llvm::SmallBitVector &Used);
MarkDeducedTemplateParameters(FunctionTemplateDecl * FunctionTemplate,llvm::SmallBitVector & Deduced)5164   void MarkDeducedTemplateParameters(FunctionTemplateDecl *FunctionTemplate,
5165                                      llvm::SmallBitVector &Deduced) {
5166     return MarkDeducedTemplateParameters(Context, FunctionTemplate, Deduced);
5167   }
5168   static void MarkDeducedTemplateParameters(ASTContext &Ctx,
5169                                          FunctionTemplateDecl *FunctionTemplate,
5170                                          llvm::SmallBitVector &Deduced);
5171 
5172   //===--------------------------------------------------------------------===//
5173   // C++ Template Instantiation
5174   //
5175 
5176   MultiLevelTemplateArgumentList getTemplateInstantiationArgs(NamedDecl *D,
5177                                      const TemplateArgumentList *Innermost = 0,
5178                                                 bool RelativeToPrimary = false,
5179                                                const FunctionDecl *Pattern = 0);
5180 
5181   /// \brief A template instantiation that is currently in progress.
5182   struct ActiveTemplateInstantiation {
5183     /// \brief The kind of template instantiation we are performing
5184     enum InstantiationKind {
5185       /// We are instantiating a template declaration. The entity is
5186       /// the declaration we're instantiating (e.g., a CXXRecordDecl).
5187       TemplateInstantiation,
5188 
5189       /// We are instantiating a default argument for a template
5190       /// parameter. The Entity is the template, and
5191       /// TemplateArgs/NumTemplateArguments provides the template
5192       /// arguments as specified.
5193       /// FIXME: Use a TemplateArgumentList
5194       DefaultTemplateArgumentInstantiation,
5195 
5196       /// We are instantiating a default argument for a function.
5197       /// The Entity is the ParmVarDecl, and TemplateArgs/NumTemplateArgs
5198       /// provides the template arguments as specified.
5199       DefaultFunctionArgumentInstantiation,
5200 
5201       /// We are substituting explicit template arguments provided for
5202       /// a function template. The entity is a FunctionTemplateDecl.
5203       ExplicitTemplateArgumentSubstitution,
5204 
5205       /// We are substituting template argument determined as part of
5206       /// template argument deduction for either a class template
5207       /// partial specialization or a function template. The
5208       /// Entity is either a ClassTemplatePartialSpecializationDecl or
5209       /// a FunctionTemplateDecl.
5210       DeducedTemplateArgumentSubstitution,
5211 
5212       /// We are substituting prior template arguments into a new
5213       /// template parameter. The template parameter itself is either a
5214       /// NonTypeTemplateParmDecl or a TemplateTemplateParmDecl.
5215       PriorTemplateArgumentSubstitution,
5216 
5217       /// We are checking the validity of a default template argument that
5218       /// has been used when naming a template-id.
5219       DefaultTemplateArgumentChecking,
5220 
5221       /// We are instantiating the exception specification for a function
5222       /// template which was deferred until it was needed.
5223       ExceptionSpecInstantiation
5224     } Kind;
5225 
5226     /// \brief The point of instantiation within the source code.
5227     SourceLocation PointOfInstantiation;
5228 
5229     /// \brief The template (or partial specialization) in which we are
5230     /// performing the instantiation, for substitutions of prior template
5231     /// arguments.
5232     NamedDecl *Template;
5233 
5234     /// \brief The entity that is being instantiated.
5235     uintptr_t Entity;
5236 
5237     /// \brief The list of template arguments we are substituting, if they
5238     /// are not part of the entity.
5239     const TemplateArgument *TemplateArgs;
5240 
5241     /// \brief The number of template arguments in TemplateArgs.
5242     unsigned NumTemplateArgs;
5243 
5244     /// \brief The template deduction info object associated with the
5245     /// substitution or checking of explicit or deduced template arguments.
5246     sema::TemplateDeductionInfo *DeductionInfo;
5247 
5248     /// \brief The source range that covers the construct that cause
5249     /// the instantiation, e.g., the template-id that causes a class
5250     /// template instantiation.
5251     SourceRange InstantiationRange;
5252 
ActiveTemplateInstantiationActiveTemplateInstantiation5253     ActiveTemplateInstantiation()
5254       : Kind(TemplateInstantiation), Template(0), Entity(0), TemplateArgs(0),
5255         NumTemplateArgs(0), DeductionInfo(0) {}
5256 
5257     /// \brief Determines whether this template is an actual instantiation
5258     /// that should be counted toward the maximum instantiation depth.
5259     bool isInstantiationRecord() const;
5260 
5261     friend bool operator==(const ActiveTemplateInstantiation &X,
5262                            const ActiveTemplateInstantiation &Y) {
5263       if (X.Kind != Y.Kind)
5264         return false;
5265 
5266       if (X.Entity != Y.Entity)
5267         return false;
5268 
5269       switch (X.Kind) {
5270       case TemplateInstantiation:
5271       case ExceptionSpecInstantiation:
5272         return true;
5273 
5274       case PriorTemplateArgumentSubstitution:
5275       case DefaultTemplateArgumentChecking:
5276         if (X.Template != Y.Template)
5277           return false;
5278 
5279         // Fall through
5280 
5281       case DefaultTemplateArgumentInstantiation:
5282       case ExplicitTemplateArgumentSubstitution:
5283       case DeducedTemplateArgumentSubstitution:
5284       case DefaultFunctionArgumentInstantiation:
5285         return X.TemplateArgs == Y.TemplateArgs;
5286 
5287       }
5288 
5289       llvm_unreachable("Invalid InstantiationKind!");
5290     }
5291 
5292     friend bool operator!=(const ActiveTemplateInstantiation &X,
5293                            const ActiveTemplateInstantiation &Y) {
5294       return !(X == Y);
5295     }
5296   };
5297 
5298   /// \brief List of active template instantiations.
5299   ///
5300   /// This vector is treated as a stack. As one template instantiation
5301   /// requires another template instantiation, additional
5302   /// instantiations are pushed onto the stack up to a
5303   /// user-configurable limit LangOptions::InstantiationDepth.
5304   SmallVector<ActiveTemplateInstantiation, 16>
5305     ActiveTemplateInstantiations;
5306 
5307   /// \brief Whether we are in a SFINAE context that is not associated with
5308   /// template instantiation.
5309   ///
5310   /// This is used when setting up a SFINAE trap (\c see SFINAETrap) outside
5311   /// of a template instantiation or template argument deduction.
5312   bool InNonInstantiationSFINAEContext;
5313 
5314   /// \brief The number of ActiveTemplateInstantiation entries in
5315   /// \c ActiveTemplateInstantiations that are not actual instantiations and,
5316   /// therefore, should not be counted as part of the instantiation depth.
5317   unsigned NonInstantiationEntries;
5318 
5319   /// \brief The last template from which a template instantiation
5320   /// error or warning was produced.
5321   ///
5322   /// This value is used to suppress printing of redundant template
5323   /// instantiation backtraces when there are multiple errors in the
5324   /// same instantiation. FIXME: Does this belong in Sema? It's tough
5325   /// to implement it anywhere else.
5326   ActiveTemplateInstantiation LastTemplateInstantiationErrorContext;
5327 
5328   /// \brief The current index into pack expansion arguments that will be
5329   /// used for substitution of parameter packs.
5330   ///
5331   /// The pack expansion index will be -1 to indicate that parameter packs
5332   /// should be instantiated as themselves. Otherwise, the index specifies
5333   /// which argument within the parameter pack will be used for substitution.
5334   int ArgumentPackSubstitutionIndex;
5335 
5336   /// \brief RAII object used to change the argument pack substitution index
5337   /// within a \c Sema object.
5338   ///
5339   /// See \c ArgumentPackSubstitutionIndex for more information.
5340   class ArgumentPackSubstitutionIndexRAII {
5341     Sema &Self;
5342     int OldSubstitutionIndex;
5343 
5344   public:
ArgumentPackSubstitutionIndexRAII(Sema & Self,int NewSubstitutionIndex)5345     ArgumentPackSubstitutionIndexRAII(Sema &Self, int NewSubstitutionIndex)
5346       : Self(Self), OldSubstitutionIndex(Self.ArgumentPackSubstitutionIndex) {
5347       Self.ArgumentPackSubstitutionIndex = NewSubstitutionIndex;
5348     }
5349 
~ArgumentPackSubstitutionIndexRAII()5350     ~ArgumentPackSubstitutionIndexRAII() {
5351       Self.ArgumentPackSubstitutionIndex = OldSubstitutionIndex;
5352     }
5353   };
5354 
5355   friend class ArgumentPackSubstitutionRAII;
5356 
5357   /// \brief The stack of calls expression undergoing template instantiation.
5358   ///
5359   /// The top of this stack is used by a fixit instantiating unresolved
5360   /// function calls to fix the AST to match the textual change it prints.
5361   SmallVector<CallExpr *, 8> CallsUndergoingInstantiation;
5362 
5363   /// \brief For each declaration that involved template argument deduction, the
5364   /// set of diagnostics that were suppressed during that template argument
5365   /// deduction.
5366   ///
5367   /// FIXME: Serialize this structure to the AST file.
5368   llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >
5369     SuppressedDiagnostics;
5370 
5371   /// \brief A stack object to be created when performing template
5372   /// instantiation.
5373   ///
5374   /// Construction of an object of type \c InstantiatingTemplate
5375   /// pushes the current instantiation onto the stack of active
5376   /// instantiations. If the size of this stack exceeds the maximum
5377   /// number of recursive template instantiations, construction
5378   /// produces an error and evaluates true.
5379   ///
5380   /// Destruction of this object will pop the named instantiation off
5381   /// the stack.
5382   struct InstantiatingTemplate {
5383     /// \brief Note that we are instantiating a class template,
5384     /// function template, or a member thereof.
5385     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5386                           Decl *Entity,
5387                           SourceRange InstantiationRange = SourceRange());
5388 
5389     struct ExceptionSpecification {};
5390     /// \brief Note that we are instantiating an exception specification
5391     /// of a function template.
5392     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5393                           FunctionDecl *Entity, ExceptionSpecification,
5394                           SourceRange InstantiationRange = SourceRange());
5395 
5396     /// \brief Note that we are instantiating a default argument in a
5397     /// template-id.
5398     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5399                           TemplateDecl *Template,
5400                           const TemplateArgument *TemplateArgs,
5401                           unsigned NumTemplateArgs,
5402                           SourceRange InstantiationRange = SourceRange());
5403 
5404     /// \brief Note that we are instantiating a default argument in a
5405     /// template-id.
5406     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5407                           FunctionTemplateDecl *FunctionTemplate,
5408                           const TemplateArgument *TemplateArgs,
5409                           unsigned NumTemplateArgs,
5410                           ActiveTemplateInstantiation::InstantiationKind Kind,
5411                           sema::TemplateDeductionInfo &DeductionInfo,
5412                           SourceRange InstantiationRange = SourceRange());
5413 
5414     /// \brief Note that we are instantiating as part of template
5415     /// argument deduction for a class template partial
5416     /// specialization.
5417     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5418                           ClassTemplatePartialSpecializationDecl *PartialSpec,
5419                           const TemplateArgument *TemplateArgs,
5420                           unsigned NumTemplateArgs,
5421                           sema::TemplateDeductionInfo &DeductionInfo,
5422                           SourceRange InstantiationRange = SourceRange());
5423 
5424     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5425                           ParmVarDecl *Param,
5426                           const TemplateArgument *TemplateArgs,
5427                           unsigned NumTemplateArgs,
5428                           SourceRange InstantiationRange = SourceRange());
5429 
5430     /// \brief Note that we are substituting prior template arguments into a
5431     /// non-type or template template parameter.
5432     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5433                           NamedDecl *Template,
5434                           NonTypeTemplateParmDecl *Param,
5435                           const TemplateArgument *TemplateArgs,
5436                           unsigned NumTemplateArgs,
5437                           SourceRange InstantiationRange);
5438 
5439     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5440                           NamedDecl *Template,
5441                           TemplateTemplateParmDecl *Param,
5442                           const TemplateArgument *TemplateArgs,
5443                           unsigned NumTemplateArgs,
5444                           SourceRange InstantiationRange);
5445 
5446     /// \brief Note that we are checking the default template argument
5447     /// against the template parameter for a given template-id.
5448     InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation,
5449                           TemplateDecl *Template,
5450                           NamedDecl *Param,
5451                           const TemplateArgument *TemplateArgs,
5452                           unsigned NumTemplateArgs,
5453                           SourceRange InstantiationRange);
5454 
5455 
5456     /// \brief Note that we have finished instantiating this template.
5457     void Clear();
5458 
~InstantiatingTemplateInstantiatingTemplate5459     ~InstantiatingTemplate() { Clear(); }
5460 
5461     /// \brief Determines whether we have exceeded the maximum
5462     /// recursive template instantiations.
5463     operator bool() const { return Invalid; }
5464 
5465   private:
5466     Sema &SemaRef;
5467     bool Invalid;
5468     bool SavedInNonInstantiationSFINAEContext;
5469     bool CheckInstantiationDepth(SourceLocation PointOfInstantiation,
5470                                  SourceRange InstantiationRange);
5471 
5472     InstantiatingTemplate(const InstantiatingTemplate&); // not implemented
5473 
5474     InstantiatingTemplate&
5475     operator=(const InstantiatingTemplate&); // not implemented
5476   };
5477 
5478   void PrintInstantiationStack();
5479 
5480   /// \brief Determines whether we are currently in a context where
5481   /// template argument substitution failures are not considered
5482   /// errors.
5483   ///
5484   /// \returns An empty \c llvm::Optional if we're not in a SFINAE context.
5485   /// Otherwise, contains a pointer that, if non-NULL, contains the nearest
5486   /// template-deduction context object, which can be used to capture
5487   /// diagnostics that will be suppressed.
5488   llvm::Optional<sema::TemplateDeductionInfo *> isSFINAEContext() const;
5489 
5490   /// \brief RAII class used to determine whether SFINAE has
5491   /// trapped any errors that occur during template argument
5492   /// deduction.`
5493   class SFINAETrap {
5494     Sema &SemaRef;
5495     unsigned PrevSFINAEErrors;
5496     bool PrevInNonInstantiationSFINAEContext;
5497     bool PrevAccessCheckingSFINAE;
5498 
5499   public:
5500     explicit SFINAETrap(Sema &SemaRef, bool AccessCheckingSFINAE = false)
SemaRef(SemaRef)5501       : SemaRef(SemaRef), PrevSFINAEErrors(SemaRef.NumSFINAEErrors),
5502         PrevInNonInstantiationSFINAEContext(
5503                                       SemaRef.InNonInstantiationSFINAEContext),
5504         PrevAccessCheckingSFINAE(SemaRef.AccessCheckingSFINAE)
5505     {
5506       if (!SemaRef.isSFINAEContext())
5507         SemaRef.InNonInstantiationSFINAEContext = true;
5508       SemaRef.AccessCheckingSFINAE = AccessCheckingSFINAE;
5509     }
5510 
~SFINAETrap()5511     ~SFINAETrap() {
5512       SemaRef.NumSFINAEErrors = PrevSFINAEErrors;
5513       SemaRef.InNonInstantiationSFINAEContext
5514         = PrevInNonInstantiationSFINAEContext;
5515       SemaRef.AccessCheckingSFINAE = PrevAccessCheckingSFINAE;
5516     }
5517 
5518     /// \brief Determine whether any SFINAE errors have been trapped.
hasErrorOccurred()5519     bool hasErrorOccurred() const {
5520       return SemaRef.NumSFINAEErrors > PrevSFINAEErrors;
5521     }
5522   };
5523 
5524   /// \brief The current instantiation scope used to store local
5525   /// variables.
5526   LocalInstantiationScope *CurrentInstantiationScope;
5527 
5528   /// \brief The number of typos corrected by CorrectTypo.
5529   unsigned TyposCorrected;
5530 
5531   typedef llvm::DenseMap<IdentifierInfo *, TypoCorrection>
5532     UnqualifiedTyposCorrectedMap;
5533 
5534   /// \brief A cache containing the results of typo correction for unqualified
5535   /// name lookup.
5536   ///
5537   /// The string is the string that we corrected to (which may be empty, if
5538   /// there was no correction), while the boolean will be true when the
5539   /// string represents a keyword.
5540   UnqualifiedTyposCorrectedMap UnqualifiedTyposCorrected;
5541 
5542   /// \brief Worker object for performing CFG-based warnings.
5543   sema::AnalysisBasedWarnings AnalysisWarnings;
5544 
5545   /// \brief An entity for which implicit template instantiation is required.
5546   ///
5547   /// The source location associated with the declaration is the first place in
5548   /// the source code where the declaration was "used". It is not necessarily
5549   /// the point of instantiation (which will be either before or after the
5550   /// namespace-scope declaration that triggered this implicit instantiation),
5551   /// However, it is the location that diagnostics should generally refer to,
5552   /// because users will need to know what code triggered the instantiation.
5553   typedef std::pair<ValueDecl *, SourceLocation> PendingImplicitInstantiation;
5554 
5555   /// \brief The queue of implicit template instantiations that are required
5556   /// but have not yet been performed.
5557   std::deque<PendingImplicitInstantiation> PendingInstantiations;
5558 
5559   /// \brief The queue of implicit template instantiations that are required
5560   /// and must be performed within the current local scope.
5561   ///
5562   /// This queue is only used for member functions of local classes in
5563   /// templates, which must be instantiated in the same scope as their
5564   /// enclosing function, so that they can reference function-local
5565   /// types, static variables, enumerators, etc.
5566   std::deque<PendingImplicitInstantiation> PendingLocalImplicitInstantiations;
5567 
5568   void PerformPendingInstantiations(bool LocalOnly = false);
5569 
5570   TypeSourceInfo *SubstType(TypeSourceInfo *T,
5571                             const MultiLevelTemplateArgumentList &TemplateArgs,
5572                             SourceLocation Loc, DeclarationName Entity);
5573 
5574   QualType SubstType(QualType T,
5575                      const MultiLevelTemplateArgumentList &TemplateArgs,
5576                      SourceLocation Loc, DeclarationName Entity);
5577 
5578   TypeSourceInfo *SubstType(TypeLoc TL,
5579                             const MultiLevelTemplateArgumentList &TemplateArgs,
5580                             SourceLocation Loc, DeclarationName Entity);
5581 
5582   TypeSourceInfo *SubstFunctionDeclType(TypeSourceInfo *T,
5583                             const MultiLevelTemplateArgumentList &TemplateArgs,
5584                                         SourceLocation Loc,
5585                                         DeclarationName Entity,
5586                                         CXXRecordDecl *ThisContext,
5587                                         unsigned ThisTypeQuals);
5588   ParmVarDecl *SubstParmVarDecl(ParmVarDecl *D,
5589                             const MultiLevelTemplateArgumentList &TemplateArgs,
5590                                 int indexAdjustment,
5591                                 llvm::Optional<unsigned> NumExpansions,
5592                                 bool ExpectParameterPack);
5593   bool SubstParmTypes(SourceLocation Loc,
5594                       ParmVarDecl **Params, unsigned NumParams,
5595                       const MultiLevelTemplateArgumentList &TemplateArgs,
5596                       SmallVectorImpl<QualType> &ParamTypes,
5597                       SmallVectorImpl<ParmVarDecl *> *OutParams = 0);
5598   ExprResult SubstExpr(Expr *E,
5599                        const MultiLevelTemplateArgumentList &TemplateArgs);
5600 
5601   /// \brief Substitute the given template arguments into a list of
5602   /// expressions, expanding pack expansions if required.
5603   ///
5604   /// \param Exprs The list of expressions to substitute into.
5605   ///
5606   /// \param NumExprs The number of expressions in \p Exprs.
5607   ///
5608   /// \param IsCall Whether this is some form of call, in which case
5609   /// default arguments will be dropped.
5610   ///
5611   /// \param TemplateArgs The set of template arguments to substitute.
5612   ///
5613   /// \param Outputs Will receive all of the substituted arguments.
5614   ///
5615   /// \returns true if an error occurred, false otherwise.
5616   bool SubstExprs(Expr **Exprs, unsigned NumExprs, bool IsCall,
5617                   const MultiLevelTemplateArgumentList &TemplateArgs,
5618                   SmallVectorImpl<Expr *> &Outputs);
5619 
5620   StmtResult SubstStmt(Stmt *S,
5621                        const MultiLevelTemplateArgumentList &TemplateArgs);
5622 
5623   Decl *SubstDecl(Decl *D, DeclContext *Owner,
5624                   const MultiLevelTemplateArgumentList &TemplateArgs);
5625 
5626   ExprResult SubstInitializer(Expr *E,
5627                        const MultiLevelTemplateArgumentList &TemplateArgs,
5628                        bool CXXDirectInit);
5629 
5630   bool
5631   SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
5632                       CXXRecordDecl *Pattern,
5633                       const MultiLevelTemplateArgumentList &TemplateArgs);
5634 
5635   bool
5636   InstantiateClass(SourceLocation PointOfInstantiation,
5637                    CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
5638                    const MultiLevelTemplateArgumentList &TemplateArgs,
5639                    TemplateSpecializationKind TSK,
5640                    bool Complain = true);
5641 
5642   bool InstantiateEnum(SourceLocation PointOfInstantiation,
5643                        EnumDecl *Instantiation, EnumDecl *Pattern,
5644                        const MultiLevelTemplateArgumentList &TemplateArgs,
5645                        TemplateSpecializationKind TSK);
5646 
5647   struct LateInstantiatedAttribute {
5648     const Attr *TmplAttr;
5649     LocalInstantiationScope *Scope;
5650     Decl *NewDecl;
5651 
LateInstantiatedAttributeLateInstantiatedAttribute5652     LateInstantiatedAttribute(const Attr *A, LocalInstantiationScope *S,
5653                               Decl *D)
5654       : TmplAttr(A), Scope(S), NewDecl(D)
5655     { }
5656   };
5657   typedef SmallVector<LateInstantiatedAttribute, 16> LateInstantiatedAttrVec;
5658 
5659   void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
5660                         const Decl *Pattern, Decl *Inst,
5661                         LateInstantiatedAttrVec *LateAttrs = 0,
5662                         LocalInstantiationScope *OuterMostScope = 0);
5663 
5664   bool
5665   InstantiateClassTemplateSpecialization(SourceLocation PointOfInstantiation,
5666                            ClassTemplateSpecializationDecl *ClassTemplateSpec,
5667                            TemplateSpecializationKind TSK,
5668                            bool Complain = true);
5669 
5670   void InstantiateClassMembers(SourceLocation PointOfInstantiation,
5671                                CXXRecordDecl *Instantiation,
5672                             const MultiLevelTemplateArgumentList &TemplateArgs,
5673                                TemplateSpecializationKind TSK);
5674 
5675   void InstantiateClassTemplateSpecializationMembers(
5676                                           SourceLocation PointOfInstantiation,
5677                            ClassTemplateSpecializationDecl *ClassTemplateSpec,
5678                                                 TemplateSpecializationKind TSK);
5679 
5680   NestedNameSpecifierLoc
5681   SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
5682                            const MultiLevelTemplateArgumentList &TemplateArgs);
5683 
5684   DeclarationNameInfo
5685   SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
5686                            const MultiLevelTemplateArgumentList &TemplateArgs);
5687   TemplateName
5688   SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, TemplateName Name,
5689                     SourceLocation Loc,
5690                     const MultiLevelTemplateArgumentList &TemplateArgs);
5691   bool Subst(const TemplateArgumentLoc *Args, unsigned NumArgs,
5692              TemplateArgumentListInfo &Result,
5693              const MultiLevelTemplateArgumentList &TemplateArgs);
5694 
5695   void InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
5696                                 FunctionDecl *Function);
5697   void InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
5698                                      FunctionDecl *Function,
5699                                      bool Recursive = false,
5700                                      bool DefinitionRequired = false);
5701   void InstantiateStaticDataMemberDefinition(
5702                                      SourceLocation PointOfInstantiation,
5703                                      VarDecl *Var,
5704                                      bool Recursive = false,
5705                                      bool DefinitionRequired = false);
5706 
5707   void InstantiateMemInitializers(CXXConstructorDecl *New,
5708                                   const CXXConstructorDecl *Tmpl,
5709                             const MultiLevelTemplateArgumentList &TemplateArgs);
5710 
5711   NamedDecl *FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
5712                           const MultiLevelTemplateArgumentList &TemplateArgs);
5713   DeclContext *FindInstantiatedContext(SourceLocation Loc, DeclContext *DC,
5714                           const MultiLevelTemplateArgumentList &TemplateArgs);
5715 
5716   // Objective-C declarations.
5717   enum ObjCContainerKind {
5718     OCK_None = -1,
5719     OCK_Interface = 0,
5720     OCK_Protocol,
5721     OCK_Category,
5722     OCK_ClassExtension,
5723     OCK_Implementation,
5724     OCK_CategoryImplementation
5725   };
5726   ObjCContainerKind getObjCContainerKind() const;
5727 
5728   Decl *ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
5729                                  IdentifierInfo *ClassName,
5730                                  SourceLocation ClassLoc,
5731                                  IdentifierInfo *SuperName,
5732                                  SourceLocation SuperLoc,
5733                                  Decl * const *ProtoRefs,
5734                                  unsigned NumProtoRefs,
5735                                  const SourceLocation *ProtoLocs,
5736                                  SourceLocation EndProtoLoc,
5737                                  AttributeList *AttrList);
5738 
5739   Decl *ActOnCompatiblityAlias(
5740                     SourceLocation AtCompatibilityAliasLoc,
5741                     IdentifierInfo *AliasName,  SourceLocation AliasLocation,
5742                     IdentifierInfo *ClassName, SourceLocation ClassLocation);
5743 
5744   bool CheckForwardProtocolDeclarationForCircularDependency(
5745     IdentifierInfo *PName,
5746     SourceLocation &PLoc, SourceLocation PrevLoc,
5747     const ObjCList<ObjCProtocolDecl> &PList);
5748 
5749   Decl *ActOnStartProtocolInterface(
5750                     SourceLocation AtProtoInterfaceLoc,
5751                     IdentifierInfo *ProtocolName, SourceLocation ProtocolLoc,
5752                     Decl * const *ProtoRefNames, unsigned NumProtoRefs,
5753                     const SourceLocation *ProtoLocs,
5754                     SourceLocation EndProtoLoc,
5755                     AttributeList *AttrList);
5756 
5757   Decl *ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
5758                                     IdentifierInfo *ClassName,
5759                                     SourceLocation ClassLoc,
5760                                     IdentifierInfo *CategoryName,
5761                                     SourceLocation CategoryLoc,
5762                                     Decl * const *ProtoRefs,
5763                                     unsigned NumProtoRefs,
5764                                     const SourceLocation *ProtoLocs,
5765                                     SourceLocation EndProtoLoc);
5766 
5767   Decl *ActOnStartClassImplementation(
5768                     SourceLocation AtClassImplLoc,
5769                     IdentifierInfo *ClassName, SourceLocation ClassLoc,
5770                     IdentifierInfo *SuperClassname,
5771                     SourceLocation SuperClassLoc);
5772 
5773   Decl *ActOnStartCategoryImplementation(SourceLocation AtCatImplLoc,
5774                                          IdentifierInfo *ClassName,
5775                                          SourceLocation ClassLoc,
5776                                          IdentifierInfo *CatName,
5777                                          SourceLocation CatLoc);
5778 
5779   DeclGroupPtrTy ActOnFinishObjCImplementation(Decl *ObjCImpDecl,
5780                                                ArrayRef<Decl *> Decls);
5781 
5782   DeclGroupPtrTy ActOnForwardClassDeclaration(SourceLocation Loc,
5783                                      IdentifierInfo **IdentList,
5784                                      SourceLocation *IdentLocs,
5785                                      unsigned NumElts);
5786 
5787   DeclGroupPtrTy ActOnForwardProtocolDeclaration(SourceLocation AtProtoclLoc,
5788                                         const IdentifierLocPair *IdentList,
5789                                         unsigned NumElts,
5790                                         AttributeList *attrList);
5791 
5792   void FindProtocolDeclaration(bool WarnOnDeclarations,
5793                                const IdentifierLocPair *ProtocolId,
5794                                unsigned NumProtocols,
5795                                SmallVectorImpl<Decl *> &Protocols);
5796 
5797   /// Ensure attributes are consistent with type.
5798   /// \param [in, out] Attributes The attributes to check; they will
5799   /// be modified to be consistent with \arg PropertyTy.
5800   void CheckObjCPropertyAttributes(Decl *PropertyPtrTy,
5801                                    SourceLocation Loc,
5802                                    unsigned &Attributes);
5803 
5804   /// Process the specified property declaration and create decls for the
5805   /// setters and getters as needed.
5806   /// \param property The property declaration being processed
5807   /// \param DC The semantic container for the property
5808   /// \param redeclaredProperty Declaration for property if redeclared
5809   ///        in class extension.
5810   /// \param lexicalDC Container for redeclaredProperty.
5811   void ProcessPropertyDecl(ObjCPropertyDecl *property,
5812                            ObjCContainerDecl *DC,
5813                            ObjCPropertyDecl *redeclaredProperty = 0,
5814                            ObjCContainerDecl *lexicalDC = 0);
5815 
5816   void DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
5817                                 ObjCPropertyDecl *SuperProperty,
5818                                 const IdentifierInfo *Name);
5819   void ComparePropertiesInBaseAndSuper(ObjCInterfaceDecl *IDecl);
5820 
5821   void CompareMethodParamsInBaseAndSuper(Decl *IDecl,
5822                                          ObjCMethodDecl *MethodDecl,
5823                                          bool IsInstance);
5824 
5825   void CompareProperties(Decl *CDecl, Decl *MergeProtocols);
5826 
5827   void DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
5828                                         ObjCInterfaceDecl *ID);
5829 
5830   void MatchOneProtocolPropertiesInClass(Decl *CDecl,
5831                                          ObjCProtocolDecl *PDecl);
5832 
5833   Decl *ActOnAtEnd(Scope *S, SourceRange AtEnd,
5834                    Decl **allMethods = 0, unsigned allNum = 0,
5835                    Decl **allProperties = 0, unsigned pNum = 0,
5836                    DeclGroupPtrTy *allTUVars = 0, unsigned tuvNum = 0);
5837 
5838   Decl *ActOnProperty(Scope *S, SourceLocation AtLoc,
5839                       SourceLocation LParenLoc,
5840                       FieldDeclarator &FD, ObjCDeclSpec &ODS,
5841                       Selector GetterSel, Selector SetterSel,
5842                       bool *OverridingProperty,
5843                       tok::ObjCKeywordKind MethodImplKind,
5844                       DeclContext *lexicalDC = 0);
5845 
5846   Decl *ActOnPropertyImplDecl(Scope *S,
5847                               SourceLocation AtLoc,
5848                               SourceLocation PropertyLoc,
5849                               bool ImplKind,
5850                               IdentifierInfo *PropertyId,
5851                               IdentifierInfo *PropertyIvar,
5852                               SourceLocation PropertyIvarLoc);
5853 
5854   enum ObjCSpecialMethodKind {
5855     OSMK_None,
5856     OSMK_Alloc,
5857     OSMK_New,
5858     OSMK_Copy,
5859     OSMK_RetainingInit,
5860     OSMK_NonRetainingInit
5861   };
5862 
5863   struct ObjCArgInfo {
5864     IdentifierInfo *Name;
5865     SourceLocation NameLoc;
5866     // The Type is null if no type was specified, and the DeclSpec is invalid
5867     // in this case.
5868     ParsedType Type;
5869     ObjCDeclSpec DeclSpec;
5870 
5871     /// ArgAttrs - Attribute list for this argument.
5872     AttributeList *ArgAttrs;
5873   };
5874 
5875   Decl *ActOnMethodDeclaration(
5876     Scope *S,
5877     SourceLocation BeginLoc, // location of the + or -.
5878     SourceLocation EndLoc,   // location of the ; or {.
5879     tok::TokenKind MethodType,
5880     ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
5881     ArrayRef<SourceLocation> SelectorLocs, Selector Sel,
5882     // optional arguments. The number of types/arguments is obtained
5883     // from the Sel.getNumArgs().
5884     ObjCArgInfo *ArgInfo,
5885     DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
5886     AttributeList *AttrList, tok::ObjCKeywordKind MethodImplKind,
5887     bool isVariadic, bool MethodDefinition);
5888 
5889   // Helper method for ActOnClassMethod/ActOnInstanceMethod.
5890   // Will search "local" class/category implementations for a method decl.
5891   // Will also search in class's root looking for instance method.
5892   // Returns 0 if no method is found.
5893   ObjCMethodDecl *LookupPrivateClassMethod(Selector Sel,
5894                                            ObjCInterfaceDecl *CDecl);
5895   ObjCMethodDecl *LookupPrivateInstanceMethod(Selector Sel,
5896                                               ObjCInterfaceDecl *ClassDecl);
5897   ObjCMethodDecl *LookupMethodInQualifiedType(Selector Sel,
5898                                               const ObjCObjectPointerType *OPT,
5899                                               bool IsInstance);
5900   ObjCMethodDecl *LookupMethodInObjectType(Selector Sel, QualType Ty,
5901                                            bool IsInstance);
5902 
5903   bool inferObjCARCLifetime(ValueDecl *decl);
5904 
5905   ExprResult
5906   HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
5907                             Expr *BaseExpr,
5908                             SourceLocation OpLoc,
5909                             DeclarationName MemberName,
5910                             SourceLocation MemberLoc,
5911                             SourceLocation SuperLoc, QualType SuperType,
5912                             bool Super);
5913 
5914   ExprResult
5915   ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
5916                             IdentifierInfo &propertyName,
5917                             SourceLocation receiverNameLoc,
5918                             SourceLocation propertyNameLoc);
5919 
5920   ObjCMethodDecl *tryCaptureObjCSelf(SourceLocation Loc);
5921 
5922   /// \brief Describes the kind of message expression indicated by a message
5923   /// send that starts with an identifier.
5924   enum ObjCMessageKind {
5925     /// \brief The message is sent to 'super'.
5926     ObjCSuperMessage,
5927     /// \brief The message is an instance message.
5928     ObjCInstanceMessage,
5929     /// \brief The message is a class message, and the identifier is a type
5930     /// name.
5931     ObjCClassMessage
5932   };
5933 
5934   ObjCMessageKind getObjCMessageKind(Scope *S,
5935                                      IdentifierInfo *Name,
5936                                      SourceLocation NameLoc,
5937                                      bool IsSuper,
5938                                      bool HasTrailingDot,
5939                                      ParsedType &ReceiverType);
5940 
5941   ExprResult ActOnSuperMessage(Scope *S, SourceLocation SuperLoc,
5942                                Selector Sel,
5943                                SourceLocation LBracLoc,
5944                                ArrayRef<SourceLocation> SelectorLocs,
5945                                SourceLocation RBracLoc,
5946                                MultiExprArg Args);
5947 
5948   ExprResult BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
5949                                QualType ReceiverType,
5950                                SourceLocation SuperLoc,
5951                                Selector Sel,
5952                                ObjCMethodDecl *Method,
5953                                SourceLocation LBracLoc,
5954                                ArrayRef<SourceLocation> SelectorLocs,
5955                                SourceLocation RBracLoc,
5956                                MultiExprArg Args,
5957                                bool isImplicit = false);
5958 
5959   ExprResult BuildClassMessageImplicit(QualType ReceiverType,
5960                                        bool isSuperReceiver,
5961                                        SourceLocation Loc,
5962                                        Selector Sel,
5963                                        ObjCMethodDecl *Method,
5964                                        MultiExprArg Args);
5965 
5966   ExprResult ActOnClassMessage(Scope *S,
5967                                ParsedType Receiver,
5968                                Selector Sel,
5969                                SourceLocation LBracLoc,
5970                                ArrayRef<SourceLocation> SelectorLocs,
5971                                SourceLocation RBracLoc,
5972                                MultiExprArg Args);
5973 
5974   ExprResult BuildInstanceMessage(Expr *Receiver,
5975                                   QualType ReceiverType,
5976                                   SourceLocation SuperLoc,
5977                                   Selector Sel,
5978                                   ObjCMethodDecl *Method,
5979                                   SourceLocation LBracLoc,
5980                                   ArrayRef<SourceLocation> SelectorLocs,
5981                                   SourceLocation RBracLoc,
5982                                   MultiExprArg Args,
5983                                   bool isImplicit = false);
5984 
5985   ExprResult BuildInstanceMessageImplicit(Expr *Receiver,
5986                                           QualType ReceiverType,
5987                                           SourceLocation Loc,
5988                                           Selector Sel,
5989                                           ObjCMethodDecl *Method,
5990                                           MultiExprArg Args);
5991 
5992   ExprResult ActOnInstanceMessage(Scope *S,
5993                                   Expr *Receiver,
5994                                   Selector Sel,
5995                                   SourceLocation LBracLoc,
5996                                   ArrayRef<SourceLocation> SelectorLocs,
5997                                   SourceLocation RBracLoc,
5998                                   MultiExprArg Args);
5999 
6000   ExprResult BuildObjCBridgedCast(SourceLocation LParenLoc,
6001                                   ObjCBridgeCastKind Kind,
6002                                   SourceLocation BridgeKeywordLoc,
6003                                   TypeSourceInfo *TSInfo,
6004                                   Expr *SubExpr);
6005 
6006   ExprResult ActOnObjCBridgedCast(Scope *S,
6007                                   SourceLocation LParenLoc,
6008                                   ObjCBridgeCastKind Kind,
6009                                   SourceLocation BridgeKeywordLoc,
6010                                   ParsedType Type,
6011                                   SourceLocation RParenLoc,
6012                                   Expr *SubExpr);
6013 
6014   bool checkInitMethod(ObjCMethodDecl *method, QualType receiverTypeIfCall);
6015 
6016   /// \brief Check whether the given new method is a valid override of the
6017   /// given overridden method, and set any properties that should be inherited.
6018   void CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
6019                                const ObjCMethodDecl *Overridden,
6020                                bool IsImplementation);
6021 
6022   /// \brief Check whether the given method overrides any methods in its class,
6023   /// calling \c CheckObjCMethodOverride for each overridden method.
6024   bool CheckObjCMethodOverrides(ObjCMethodDecl *NewMethod, DeclContext *DC);
6025 
6026   enum PragmaOptionsAlignKind {
6027     POAK_Native,  // #pragma options align=native
6028     POAK_Natural, // #pragma options align=natural
6029     POAK_Packed,  // #pragma options align=packed
6030     POAK_Power,   // #pragma options align=power
6031     POAK_Mac68k,  // #pragma options align=mac68k
6032     POAK_Reset    // #pragma options align=reset
6033   };
6034 
6035   /// ActOnPragmaOptionsAlign - Called on well formed #pragma options align.
6036   void ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
6037                                SourceLocation PragmaLoc,
6038                                SourceLocation KindLoc);
6039 
6040   enum PragmaPackKind {
6041     PPK_Default, // #pragma pack([n])
6042     PPK_Show,    // #pragma pack(show), only supported by MSVC.
6043     PPK_Push,    // #pragma pack(push, [identifier], [n])
6044     PPK_Pop      // #pragma pack(pop, [identifier], [n])
6045   };
6046 
6047   enum PragmaMSStructKind {
6048     PMSST_OFF,  // #pragms ms_struct off
6049     PMSST_ON    // #pragms ms_struct on
6050   };
6051 
6052   /// ActOnPragmaPack - Called on well formed #pragma pack(...).
6053   void ActOnPragmaPack(PragmaPackKind Kind,
6054                        IdentifierInfo *Name,
6055                        Expr *Alignment,
6056                        SourceLocation PragmaLoc,
6057                        SourceLocation LParenLoc,
6058                        SourceLocation RParenLoc);
6059 
6060   /// ActOnPragmaMSStruct - Called on well formed #pragms ms_struct [on|off].
6061   void ActOnPragmaMSStruct(PragmaMSStructKind Kind);
6062 
6063   /// ActOnPragmaUnused - Called on well-formed '#pragma unused'.
6064   void ActOnPragmaUnused(const Token &Identifier,
6065                          Scope *curScope,
6066                          SourceLocation PragmaLoc);
6067 
6068   /// ActOnPragmaVisibility - Called on well formed #pragma GCC visibility... .
6069   void ActOnPragmaVisibility(const IdentifierInfo* VisType,
6070                              SourceLocation PragmaLoc);
6071 
6072   NamedDecl *DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
6073                                  SourceLocation Loc);
6074   void DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W);
6075 
6076   /// ActOnPragmaWeakID - Called on well formed #pragma weak ident.
6077   void ActOnPragmaWeakID(IdentifierInfo* WeakName,
6078                          SourceLocation PragmaLoc,
6079                          SourceLocation WeakNameLoc);
6080 
6081   /// ActOnPragmaRedefineExtname - Called on well formed
6082   /// #pragma redefine_extname oldname newname.
6083   void ActOnPragmaRedefineExtname(IdentifierInfo* WeakName,
6084                                   IdentifierInfo* AliasName,
6085                                   SourceLocation PragmaLoc,
6086                                   SourceLocation WeakNameLoc,
6087                                   SourceLocation AliasNameLoc);
6088 
6089   /// ActOnPragmaWeakAlias - Called on well formed #pragma weak ident = ident.
6090   void ActOnPragmaWeakAlias(IdentifierInfo* WeakName,
6091                             IdentifierInfo* AliasName,
6092                             SourceLocation PragmaLoc,
6093                             SourceLocation WeakNameLoc,
6094                             SourceLocation AliasNameLoc);
6095 
6096   /// ActOnPragmaFPContract - Called on well formed
6097   /// #pragma {STDC,OPENCL} FP_CONTRACT
6098   void ActOnPragmaFPContract(tok::OnOffSwitch OOS);
6099 
6100   /// AddAlignmentAttributesForRecord - Adds any needed alignment attributes to
6101   /// a the record decl, to handle '#pragma pack' and '#pragma options align'.
6102   void AddAlignmentAttributesForRecord(RecordDecl *RD);
6103 
6104   /// AddMsStructLayoutForRecord - Adds ms_struct layout attribute to record.
6105   void AddMsStructLayoutForRecord(RecordDecl *RD);
6106 
6107   /// FreePackedContext - Deallocate and null out PackContext.
6108   void FreePackedContext();
6109 
6110   /// PushNamespaceVisibilityAttr - Note that we've entered a
6111   /// namespace with a visibility attribute.
6112   void PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
6113                                    SourceLocation Loc);
6114 
6115   /// AddPushedVisibilityAttribute - If '#pragma GCC visibility' was used,
6116   /// add an appropriate visibility attribute.
6117   void AddPushedVisibilityAttribute(Decl *RD);
6118 
6119   /// PopPragmaVisibility - Pop the top element of the visibility stack; used
6120   /// for '#pragma GCC visibility' and visibility attributes on namespaces.
6121   void PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc);
6122 
6123   /// FreeVisContext - Deallocate and null out VisContext.
6124   void FreeVisContext();
6125 
6126   /// AddCFAuditedAttribute - Check whether we're currently within
6127   /// '#pragma clang arc_cf_code_audited' and, if so, consider adding
6128   /// the appropriate attribute.
6129   void AddCFAuditedAttribute(Decl *D);
6130 
6131   /// AddAlignedAttr - Adds an aligned attribute to a particular declaration.
6132   void AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E);
6133   void AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *T);
6134 
6135   /// \brief The kind of conversion being performed.
6136   enum CheckedConversionKind {
6137     /// \brief An implicit conversion.
6138     CCK_ImplicitConversion,
6139     /// \brief A C-style cast.
6140     CCK_CStyleCast,
6141     /// \brief A functional-style cast.
6142     CCK_FunctionalCast,
6143     /// \brief A cast other than a C-style cast.
6144     CCK_OtherCast
6145   };
6146 
6147   /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit
6148   /// cast.  If there is already an implicit cast, merge into the existing one.
6149   /// If isLvalue, the result of the cast is an lvalue.
6150   ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK,
6151                                ExprValueKind VK = VK_RValue,
6152                                const CXXCastPath *BasePath = 0,
6153                                CheckedConversionKind CCK
6154                                   = CCK_ImplicitConversion);
6155 
6156   /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
6157   /// to the conversion from scalar type ScalarTy to the Boolean type.
6158   static CastKind ScalarTypeToBooleanCastKind(QualType ScalarTy);
6159 
6160   /// IgnoredValueConversions - Given that an expression's result is
6161   /// syntactically ignored, perform any conversions that are
6162   /// required.
6163   ExprResult IgnoredValueConversions(Expr *E);
6164 
6165   // UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts
6166   // functions and arrays to their respective pointers (C99 6.3.2.1).
6167   ExprResult UsualUnaryConversions(Expr *E);
6168 
6169   // DefaultFunctionArrayConversion - converts functions and arrays
6170   // to their respective pointers (C99 6.3.2.1).
6171   ExprResult DefaultFunctionArrayConversion(Expr *E);
6172 
6173   // DefaultFunctionArrayLvalueConversion - converts functions and
6174   // arrays to their respective pointers and performs the
6175   // lvalue-to-rvalue conversion.
6176   ExprResult DefaultFunctionArrayLvalueConversion(Expr *E);
6177 
6178   // DefaultLvalueConversion - performs lvalue-to-rvalue conversion on
6179   // the operand.  This is DefaultFunctionArrayLvalueConversion,
6180   // except that it assumes the operand isn't of function or array
6181   // type.
6182   ExprResult DefaultLvalueConversion(Expr *E);
6183 
6184   // DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
6185   // do not have a prototype. Integer promotions are performed on each
6186   // argument, and arguments that have type float are promoted to double.
6187   ExprResult DefaultArgumentPromotion(Expr *E);
6188 
6189   // Used for emitting the right warning by DefaultVariadicArgumentPromotion
6190   enum VariadicCallType {
6191     VariadicFunction,
6192     VariadicBlock,
6193     VariadicMethod,
6194     VariadicConstructor,
6195     VariadicDoesNotApply
6196   };
6197 
6198   /// GatherArgumentsForCall - Collector argument expressions for various
6199   /// form of call prototypes.
6200   bool GatherArgumentsForCall(SourceLocation CallLoc,
6201                               FunctionDecl *FDecl,
6202                               const FunctionProtoType *Proto,
6203                               unsigned FirstProtoArg,
6204                               Expr **Args, unsigned NumArgs,
6205                               SmallVector<Expr *, 8> &AllArgs,
6206                               VariadicCallType CallType = VariadicDoesNotApply,
6207                               bool AllowExplicit = false);
6208 
6209   // DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
6210   // will warn if the resulting type is not a POD type.
6211   ExprResult DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
6212                                               FunctionDecl *FDecl);
6213 
6214   // UsualArithmeticConversions - performs the UsualUnaryConversions on it's
6215   // operands and then handles various conversions that are common to binary
6216   // operators (C99 6.3.1.8). If both operands aren't arithmetic, this
6217   // routine returns the first non-arithmetic type found. The client is
6218   // responsible for emitting appropriate error diagnostics.
6219   QualType UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
6220                                       bool IsCompAssign = false);
6221 
6222   /// AssignConvertType - All of the 'assignment' semantic checks return this
6223   /// enum to indicate whether the assignment was allowed.  These checks are
6224   /// done for simple assignments, as well as initialization, return from
6225   /// function, argument passing, etc.  The query is phrased in terms of a
6226   /// source and destination type.
6227   enum AssignConvertType {
6228     /// Compatible - the types are compatible according to the standard.
6229     Compatible,
6230 
6231     /// PointerToInt - The assignment converts a pointer to an int, which we
6232     /// accept as an extension.
6233     PointerToInt,
6234 
6235     /// IntToPointer - The assignment converts an int to a pointer, which we
6236     /// accept as an extension.
6237     IntToPointer,
6238 
6239     /// FunctionVoidPointer - The assignment is between a function pointer and
6240     /// void*, which the standard doesn't allow, but we accept as an extension.
6241     FunctionVoidPointer,
6242 
6243     /// IncompatiblePointer - The assignment is between two pointers types that
6244     /// are not compatible, but we accept them as an extension.
6245     IncompatiblePointer,
6246 
6247     /// IncompatiblePointer - The assignment is between two pointers types which
6248     /// point to integers which have a different sign, but are otherwise
6249     /// identical. This is a subset of the above, but broken out because it's by
6250     /// far the most common case of incompatible pointers.
6251     IncompatiblePointerSign,
6252 
6253     /// CompatiblePointerDiscardsQualifiers - The assignment discards
6254     /// c/v/r qualifiers, which we accept as an extension.
6255     CompatiblePointerDiscardsQualifiers,
6256 
6257     /// IncompatiblePointerDiscardsQualifiers - The assignment
6258     /// discards qualifiers that we don't permit to be discarded,
6259     /// like address spaces.
6260     IncompatiblePointerDiscardsQualifiers,
6261 
6262     /// IncompatibleNestedPointerQualifiers - The assignment is between two
6263     /// nested pointer types, and the qualifiers other than the first two
6264     /// levels differ e.g. char ** -> const char **, but we accept them as an
6265     /// extension.
6266     IncompatibleNestedPointerQualifiers,
6267 
6268     /// IncompatibleVectors - The assignment is between two vector types that
6269     /// have the same size, which we accept as an extension.
6270     IncompatibleVectors,
6271 
6272     /// IntToBlockPointer - The assignment converts an int to a block
6273     /// pointer. We disallow this.
6274     IntToBlockPointer,
6275 
6276     /// IncompatibleBlockPointer - The assignment is between two block
6277     /// pointers types that are not compatible.
6278     IncompatibleBlockPointer,
6279 
6280     /// IncompatibleObjCQualifiedId - The assignment is between a qualified
6281     /// id type and something else (that is incompatible with it). For example,
6282     /// "id <XXX>" = "Foo *", where "Foo *" doesn't implement the XXX protocol.
6283     IncompatibleObjCQualifiedId,
6284 
6285     /// IncompatibleObjCWeakRef - Assigning a weak-unavailable object to an
6286     /// object with __weak qualifier.
6287     IncompatibleObjCWeakRef,
6288 
6289     /// Incompatible - We reject this conversion outright, it is invalid to
6290     /// represent it in the AST.
6291     Incompatible
6292   };
6293 
6294   /// DiagnoseAssignmentResult - Emit a diagnostic, if required, for the
6295   /// assignment conversion type specified by ConvTy.  This returns true if the
6296   /// conversion was invalid or false if the conversion was accepted.
6297   bool DiagnoseAssignmentResult(AssignConvertType ConvTy,
6298                                 SourceLocation Loc,
6299                                 QualType DstType, QualType SrcType,
6300                                 Expr *SrcExpr, AssignmentAction Action,
6301                                 bool *Complained = 0);
6302 
6303   /// CheckAssignmentConstraints - Perform type checking for assignment,
6304   /// argument passing, variable initialization, and function return values.
6305   /// C99 6.5.16.
6306   AssignConvertType CheckAssignmentConstraints(SourceLocation Loc,
6307                                                QualType LHSType,
6308                                                QualType RHSType);
6309 
6310   /// Check assignment constraints and prepare for a conversion of the
6311   /// RHS to the LHS type.
6312   AssignConvertType CheckAssignmentConstraints(QualType LHSType,
6313                                                ExprResult &RHS,
6314                                                CastKind &Kind);
6315 
6316   // CheckSingleAssignmentConstraints - Currently used by
6317   // CheckAssignmentOperands, and ActOnReturnStmt. Prior to type checking,
6318   // this routine performs the default function/array converions.
6319   AssignConvertType CheckSingleAssignmentConstraints(QualType LHSType,
6320                                                      ExprResult &RHS,
6321                                                      bool Diagnose = true);
6322 
6323   // \brief If the lhs type is a transparent union, check whether we
6324   // can initialize the transparent union with the given expression.
6325   AssignConvertType CheckTransparentUnionArgumentConstraints(QualType ArgType,
6326                                                              ExprResult &RHS);
6327 
6328   bool IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType);
6329 
6330   bool CheckExceptionSpecCompatibility(Expr *From, QualType ToType);
6331 
6332   ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
6333                                        AssignmentAction Action,
6334                                        bool AllowExplicit = false);
6335   ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
6336                                        AssignmentAction Action,
6337                                        bool AllowExplicit,
6338                                        ImplicitConversionSequence& ICS);
6339   ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
6340                                        const ImplicitConversionSequence& ICS,
6341                                        AssignmentAction Action,
6342                                        CheckedConversionKind CCK
6343                                           = CCK_ImplicitConversion);
6344   ExprResult PerformImplicitConversion(Expr *From, QualType ToType,
6345                                        const StandardConversionSequence& SCS,
6346                                        AssignmentAction Action,
6347                                        CheckedConversionKind CCK);
6348 
6349   /// the following "Check" methods will return a valid/converted QualType
6350   /// or a null QualType (indicating an error diagnostic was issued).
6351 
6352   /// type checking binary operators (subroutines of CreateBuiltinBinOp).
6353   QualType InvalidOperands(SourceLocation Loc, ExprResult &LHS,
6354                            ExprResult &RHS);
6355   QualType CheckPointerToMemberOperands( // C++ 5.5
6356     ExprResult &LHS, ExprResult &RHS, ExprValueKind &VK,
6357     SourceLocation OpLoc, bool isIndirect);
6358   QualType CheckMultiplyDivideOperands( // C99 6.5.5
6359     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign,
6360     bool IsDivide);
6361   QualType CheckRemainderOperands( // C99 6.5.5
6362     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
6363     bool IsCompAssign = false);
6364   QualType CheckAdditionOperands( // C99 6.5.6
6365     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc,
6366     QualType* CompLHSTy = 0);
6367   QualType CheckSubtractionOperands( // C99 6.5.6
6368     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
6369     QualType* CompLHSTy = 0);
6370   QualType CheckShiftOperands( // C99 6.5.7
6371     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc,
6372     bool IsCompAssign = false);
6373   QualType CheckCompareOperands( // C99 6.5.8/9
6374     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned OpaqueOpc,
6375                                 bool isRelational);
6376   QualType CheckBitwiseOperands( // C99 6.5.[10...12]
6377     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc,
6378     bool IsCompAssign = false);
6379   QualType CheckLogicalOperands( // C99 6.5.[13,14]
6380     ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, unsigned Opc);
6381   // CheckAssignmentOperands is used for both simple and compound assignment.
6382   // For simple assignment, pass both expressions and a null converted type.
6383   // For compound assignment, pass both expressions and the converted type.
6384   QualType CheckAssignmentOperands( // C99 6.5.16.[1,2]
6385     Expr *LHSExpr, ExprResult &RHS, SourceLocation Loc, QualType CompoundType);
6386 
6387   ExprResult checkPseudoObjectIncDec(Scope *S, SourceLocation OpLoc,
6388                                      UnaryOperatorKind Opcode, Expr *Op);
6389   ExprResult checkPseudoObjectAssignment(Scope *S, SourceLocation OpLoc,
6390                                          BinaryOperatorKind Opcode,
6391                                          Expr *LHS, Expr *RHS);
6392   ExprResult checkPseudoObjectRValue(Expr *E);
6393   Expr *recreateSyntacticForm(PseudoObjectExpr *E);
6394 
6395   QualType CheckConditionalOperands( // C99 6.5.15
6396     ExprResult &Cond, ExprResult &LHS, ExprResult &RHS,
6397     ExprValueKind &VK, ExprObjectKind &OK, SourceLocation QuestionLoc);
6398   QualType CXXCheckConditionalOperands( // C++ 5.16
6399     ExprResult &cond, ExprResult &lhs, ExprResult &rhs,
6400     ExprValueKind &VK, ExprObjectKind &OK, SourceLocation questionLoc);
6401   QualType FindCompositePointerType(SourceLocation Loc, Expr *&E1, Expr *&E2,
6402                                     bool *NonStandardCompositeType = 0);
6403   QualType FindCompositePointerType(SourceLocation Loc,
6404                                     ExprResult &E1, ExprResult &E2,
6405                                     bool *NonStandardCompositeType = 0) {
6406     Expr *E1Tmp = E1.take(), *E2Tmp = E2.take();
6407     QualType Composite = FindCompositePointerType(Loc, E1Tmp, E2Tmp,
6408                                                   NonStandardCompositeType);
6409     E1 = Owned(E1Tmp);
6410     E2 = Owned(E2Tmp);
6411     return Composite;
6412   }
6413 
6414   QualType FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
6415                                         SourceLocation QuestionLoc);
6416 
6417   bool DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
6418                                   SourceLocation QuestionLoc);
6419 
6420   /// type checking for vector binary operators.
6421   QualType CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
6422                                SourceLocation Loc, bool IsCompAssign);
6423   QualType GetSignedVectorType(QualType V);
6424   QualType CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
6425                                       SourceLocation Loc, bool isRelational);
6426   QualType CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
6427                                       SourceLocation Loc);
6428 
6429   /// type checking declaration initializers (C99 6.7.8)
6430   bool CheckForConstantInitializer(Expr *e, QualType t);
6431 
6432   // type checking C++ declaration initializers (C++ [dcl.init]).
6433 
6434   /// ReferenceCompareResult - Expresses the result of comparing two
6435   /// types (cv1 T1 and cv2 T2) to determine their compatibility for the
6436   /// purposes of initialization by reference (C++ [dcl.init.ref]p4).
6437   enum ReferenceCompareResult {
6438     /// Ref_Incompatible - The two types are incompatible, so direct
6439     /// reference binding is not possible.
6440     Ref_Incompatible = 0,
6441     /// Ref_Related - The two types are reference-related, which means
6442     /// that their unqualified forms (T1 and T2) are either the same
6443     /// or T1 is a base class of T2.
6444     Ref_Related,
6445     /// Ref_Compatible_With_Added_Qualification - The two types are
6446     /// reference-compatible with added qualification, meaning that
6447     /// they are reference-compatible and the qualifiers on T1 (cv1)
6448     /// are greater than the qualifiers on T2 (cv2).
6449     Ref_Compatible_With_Added_Qualification,
6450     /// Ref_Compatible - The two types are reference-compatible and
6451     /// have equivalent qualifiers (cv1 == cv2).
6452     Ref_Compatible
6453   };
6454 
6455   ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc,
6456                                                       QualType T1, QualType T2,
6457                                                       bool &DerivedToBase,
6458                                                       bool &ObjCConversion,
6459                                                 bool &ObjCLifetimeConversion);
6460 
6461   ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
6462                                  Expr *CastExpr, CastKind &CastKind,
6463                                  ExprValueKind &VK, CXXCastPath &Path);
6464 
6465   /// \brief Force an expression with unknown-type to an expression of the
6466   /// given type.
6467   ExprResult forceUnknownAnyToType(Expr *E, QualType ToType);
6468 
6469   // CheckVectorCast - check type constraints for vectors.
6470   // Since vectors are an extension, there are no C standard reference for this.
6471   // We allow casting between vectors and integer datatypes of the same size.
6472   // returns true if the cast is invalid
6473   bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
6474                        CastKind &Kind);
6475 
6476   // CheckExtVectorCast - check type constraints for extended vectors.
6477   // Since vectors are an extension, there are no C standard reference for this.
6478   // We allow casting between vectors and integer datatypes of the same size,
6479   // or vectors and the element type of that vector.
6480   // returns the cast expr
6481   ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr,
6482                                 CastKind &Kind);
6483 
6484   ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo,
6485                                         SourceLocation LParenLoc,
6486                                         Expr *CastExpr,
6487                                         SourceLocation RParenLoc);
6488 
6489   enum ARCConversionResult { ACR_okay, ACR_unbridged };
6490 
6491   /// \brief Checks for invalid conversions and casts between
6492   /// retainable pointers and other pointer kinds.
6493   ARCConversionResult CheckObjCARCConversion(SourceRange castRange,
6494                                              QualType castType, Expr *&op,
6495                                              CheckedConversionKind CCK);
6496 
6497   Expr *stripARCUnbridgedCast(Expr *e);
6498   void diagnoseARCUnbridgedCast(Expr *e);
6499 
6500   bool CheckObjCARCUnavailableWeakConversion(QualType castType,
6501                                              QualType ExprType);
6502 
6503   /// checkRetainCycles - Check whether an Objective-C message send
6504   /// might create an obvious retain cycle.
6505   void checkRetainCycles(ObjCMessageExpr *msg);
6506   void checkRetainCycles(Expr *receiver, Expr *argument);
6507 
6508   /// checkUnsafeAssigns - Check whether +1 expr is being assigned
6509   /// to weak/__unsafe_unretained type.
6510   bool checkUnsafeAssigns(SourceLocation Loc, QualType LHS, Expr *RHS);
6511 
6512   /// checkUnsafeExprAssigns - Check whether +1 expr is being assigned
6513   /// to weak/__unsafe_unretained expression.
6514   void checkUnsafeExprAssigns(SourceLocation Loc, Expr *LHS, Expr *RHS);
6515 
6516   /// CheckMessageArgumentTypes - Check types in an Obj-C message send.
6517   /// \param Method - May be null.
6518   /// \param [out] ReturnType - The return type of the send.
6519   /// \return true iff there were any incompatible types.
6520   bool CheckMessageArgumentTypes(QualType ReceiverType,
6521                                  Expr **Args, unsigned NumArgs, Selector Sel,
6522                                  ObjCMethodDecl *Method, bool isClassMessage,
6523                                  bool isSuperMessage,
6524                                  SourceLocation lbrac, SourceLocation rbrac,
6525                                  QualType &ReturnType, ExprValueKind &VK);
6526 
6527   /// \brief Determine the result of a message send expression based on
6528   /// the type of the receiver, the method expected to receive the message,
6529   /// and the form of the message send.
6530   QualType getMessageSendResultType(QualType ReceiverType,
6531                                     ObjCMethodDecl *Method,
6532                                     bool isClassMessage, bool isSuperMessage);
6533 
6534   /// \brief If the given expression involves a message send to a method
6535   /// with a related result type, emit a note describing what happened.
6536   void EmitRelatedResultTypeNote(const Expr *E);
6537 
6538   /// CheckBooleanCondition - Diagnose problems involving the use of
6539   /// the given expression as a boolean condition (e.g. in an if
6540   /// statement).  Also performs the standard function and array
6541   /// decays, possibly changing the input variable.
6542   ///
6543   /// \param Loc - A location associated with the condition, e.g. the
6544   /// 'if' keyword.
6545   /// \return true iff there were any errors
6546   ExprResult CheckBooleanCondition(Expr *E, SourceLocation Loc);
6547 
6548   ExprResult ActOnBooleanCondition(Scope *S, SourceLocation Loc,
6549                                    Expr *SubExpr);
6550 
6551   /// DiagnoseAssignmentAsCondition - Given that an expression is
6552   /// being used as a boolean condition, warn if it's an assignment.
6553   void DiagnoseAssignmentAsCondition(Expr *E);
6554 
6555   /// \brief Redundant parentheses over an equality comparison can indicate
6556   /// that the user intended an assignment used as condition.
6557   void DiagnoseEqualityWithExtraParens(ParenExpr *ParenE);
6558 
6559   /// CheckCXXBooleanCondition - Returns true if conversion to bool is invalid.
6560   ExprResult CheckCXXBooleanCondition(Expr *CondExpr);
6561 
6562   /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have
6563   /// the specified width and sign.  If an overflow occurs, detect it and emit
6564   /// the specified diagnostic.
6565   void ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &OldVal,
6566                                           unsigned NewWidth, bool NewSign,
6567                                           SourceLocation Loc, unsigned DiagID);
6568 
6569   /// Checks that the Objective-C declaration is declared in the global scope.
6570   /// Emits an error and marks the declaration as invalid if it's not declared
6571   /// in the global scope.
6572   bool CheckObjCDeclScope(Decl *D);
6573 
6574   /// VerifyIntegerConstantExpression - Verifies that an expression is an ICE,
6575   /// and reports the appropriate diagnostics. Returns false on success.
6576   /// Can optionally return the value of the expression.
6577   ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
6578                                              const PartialDiagnostic &Diag,
6579                                              bool AllowFold,
6580                                              const PartialDiagnostic &FoldDiag);
6581   ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
6582                                              const PartialDiagnostic &Diag,
6583                                              bool AllowFold = true) {
6584     return VerifyIntegerConstantExpression(E, Result, Diag, AllowFold,
6585                                            PDiag(0));
6586   }
6587   ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result = 0);
6588 
6589   /// VerifyBitField - verifies that a bit field expression is an ICE and has
6590   /// the correct width, and that the field type is valid.
6591   /// Returns false on success.
6592   /// Can optionally return whether the bit-field is of width 0
6593   ExprResult VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
6594                             QualType FieldTy, Expr *BitWidth,
6595                             bool *ZeroWidth = 0);
6596 
6597   enum CUDAFunctionTarget {
6598     CFT_Device,
6599     CFT_Global,
6600     CFT_Host,
6601     CFT_HostDevice
6602   };
6603 
6604   CUDAFunctionTarget IdentifyCUDATarget(const FunctionDecl *D);
6605 
6606   bool CheckCUDATarget(CUDAFunctionTarget CallerTarget,
6607                        CUDAFunctionTarget CalleeTarget);
6608 
CheckCUDATarget(const FunctionDecl * Caller,const FunctionDecl * Callee)6609   bool CheckCUDATarget(const FunctionDecl *Caller, const FunctionDecl *Callee) {
6610     return CheckCUDATarget(IdentifyCUDATarget(Caller),
6611                            IdentifyCUDATarget(Callee));
6612   }
6613 
6614   /// \name Code completion
6615   //@{
6616   /// \brief Describes the context in which code completion occurs.
6617   enum ParserCompletionContext {
6618     /// \brief Code completion occurs at top-level or namespace context.
6619     PCC_Namespace,
6620     /// \brief Code completion occurs within a class, struct, or union.
6621     PCC_Class,
6622     /// \brief Code completion occurs within an Objective-C interface, protocol,
6623     /// or category.
6624     PCC_ObjCInterface,
6625     /// \brief Code completion occurs within an Objective-C implementation or
6626     /// category implementation
6627     PCC_ObjCImplementation,
6628     /// \brief Code completion occurs within the list of instance variables
6629     /// in an Objective-C interface, protocol, category, or implementation.
6630     PCC_ObjCInstanceVariableList,
6631     /// \brief Code completion occurs following one or more template
6632     /// headers.
6633     PCC_Template,
6634     /// \brief Code completion occurs following one or more template
6635     /// headers within a class.
6636     PCC_MemberTemplate,
6637     /// \brief Code completion occurs within an expression.
6638     PCC_Expression,
6639     /// \brief Code completion occurs within a statement, which may
6640     /// also be an expression or a declaration.
6641     PCC_Statement,
6642     /// \brief Code completion occurs at the beginning of the
6643     /// initialization statement (or expression) in a for loop.
6644     PCC_ForInit,
6645     /// \brief Code completion occurs within the condition of an if,
6646     /// while, switch, or for statement.
6647     PCC_Condition,
6648     /// \brief Code completion occurs within the body of a function on a
6649     /// recovery path, where we do not have a specific handle on our position
6650     /// in the grammar.
6651     PCC_RecoveryInFunction,
6652     /// \brief Code completion occurs where only a type is permitted.
6653     PCC_Type,
6654     /// \brief Code completion occurs in a parenthesized expression, which
6655     /// might also be a type cast.
6656     PCC_ParenthesizedExpression,
6657     /// \brief Code completion occurs within a sequence of declaration
6658     /// specifiers within a function, method, or block.
6659     PCC_LocalDeclarationSpecifiers
6660   };
6661 
6662   void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path);
6663   void CodeCompleteOrdinaryName(Scope *S,
6664                                 ParserCompletionContext CompletionContext);
6665   void CodeCompleteDeclSpec(Scope *S, DeclSpec &DS,
6666                             bool AllowNonIdentifiers,
6667                             bool AllowNestedNameSpecifiers);
6668 
6669   struct CodeCompleteExpressionData;
6670   void CodeCompleteExpression(Scope *S,
6671                               const CodeCompleteExpressionData &Data);
6672   void CodeCompleteMemberReferenceExpr(Scope *S, Expr *Base,
6673                                        SourceLocation OpLoc,
6674                                        bool IsArrow);
6675   void CodeCompletePostfixExpression(Scope *S, ExprResult LHS);
6676   void CodeCompleteTag(Scope *S, unsigned TagSpec);
6677   void CodeCompleteTypeQualifiers(DeclSpec &DS);
6678   void CodeCompleteCase(Scope *S);
6679   void CodeCompleteCall(Scope *S, Expr *Fn, llvm::ArrayRef<Expr *> Args);
6680   void CodeCompleteInitializer(Scope *S, Decl *D);
6681   void CodeCompleteReturn(Scope *S);
6682   void CodeCompleteAfterIf(Scope *S);
6683   void CodeCompleteAssignmentRHS(Scope *S, Expr *LHS);
6684 
6685   void CodeCompleteQualifiedId(Scope *S, CXXScopeSpec &SS,
6686                                bool EnteringContext);
6687   void CodeCompleteUsing(Scope *S);
6688   void CodeCompleteUsingDirective(Scope *S);
6689   void CodeCompleteNamespaceDecl(Scope *S);
6690   void CodeCompleteNamespaceAliasDecl(Scope *S);
6691   void CodeCompleteOperatorName(Scope *S);
6692   void CodeCompleteConstructorInitializer(Decl *Constructor,
6693                                           CXXCtorInitializer** Initializers,
6694                                           unsigned NumInitializers);
6695   void CodeCompleteLambdaIntroducer(Scope *S, LambdaIntroducer &Intro,
6696                                     bool AfterAmpersand);
6697 
6698   void CodeCompleteObjCAtDirective(Scope *S);
6699   void CodeCompleteObjCAtVisibility(Scope *S);
6700   void CodeCompleteObjCAtStatement(Scope *S);
6701   void CodeCompleteObjCAtExpression(Scope *S);
6702   void CodeCompleteObjCPropertyFlags(Scope *S, ObjCDeclSpec &ODS);
6703   void CodeCompleteObjCPropertyGetter(Scope *S);
6704   void CodeCompleteObjCPropertySetter(Scope *S);
6705   void CodeCompleteObjCPassingType(Scope *S, ObjCDeclSpec &DS,
6706                                    bool IsParameter);
6707   void CodeCompleteObjCMessageReceiver(Scope *S);
6708   void CodeCompleteObjCSuperMessage(Scope *S, SourceLocation SuperLoc,
6709                                     IdentifierInfo **SelIdents,
6710                                     unsigned NumSelIdents,
6711                                     bool AtArgumentExpression);
6712   void CodeCompleteObjCClassMessage(Scope *S, ParsedType Receiver,
6713                                     IdentifierInfo **SelIdents,
6714                                     unsigned NumSelIdents,
6715                                     bool AtArgumentExpression,
6716                                     bool IsSuper = false);
6717   void CodeCompleteObjCInstanceMessage(Scope *S, Expr *Receiver,
6718                                        IdentifierInfo **SelIdents,
6719                                        unsigned NumSelIdents,
6720                                        bool AtArgumentExpression,
6721                                        ObjCInterfaceDecl *Super = 0);
6722   void CodeCompleteObjCForCollection(Scope *S,
6723                                      DeclGroupPtrTy IterationVar);
6724   void CodeCompleteObjCSelector(Scope *S,
6725                                 IdentifierInfo **SelIdents,
6726                                 unsigned NumSelIdents);
6727   void CodeCompleteObjCProtocolReferences(IdentifierLocPair *Protocols,
6728                                           unsigned NumProtocols);
6729   void CodeCompleteObjCProtocolDecl(Scope *S);
6730   void CodeCompleteObjCInterfaceDecl(Scope *S);
6731   void CodeCompleteObjCSuperclass(Scope *S,
6732                                   IdentifierInfo *ClassName,
6733                                   SourceLocation ClassNameLoc);
6734   void CodeCompleteObjCImplementationDecl(Scope *S);
6735   void CodeCompleteObjCInterfaceCategory(Scope *S,
6736                                          IdentifierInfo *ClassName,
6737                                          SourceLocation ClassNameLoc);
6738   void CodeCompleteObjCImplementationCategory(Scope *S,
6739                                               IdentifierInfo *ClassName,
6740                                               SourceLocation ClassNameLoc);
6741   void CodeCompleteObjCPropertyDefinition(Scope *S);
6742   void CodeCompleteObjCPropertySynthesizeIvar(Scope *S,
6743                                               IdentifierInfo *PropertyName);
6744   void CodeCompleteObjCMethodDecl(Scope *S,
6745                                   bool IsInstanceMethod,
6746                                   ParsedType ReturnType);
6747   void CodeCompleteObjCMethodDeclSelector(Scope *S,
6748                                           bool IsInstanceMethod,
6749                                           bool AtParameterName,
6750                                           ParsedType ReturnType,
6751                                           IdentifierInfo **SelIdents,
6752                                           unsigned NumSelIdents);
6753   void CodeCompletePreprocessorDirective(bool InConditional);
6754   void CodeCompleteInPreprocessorConditionalExclusion(Scope *S);
6755   void CodeCompletePreprocessorMacroName(bool IsDefinition);
6756   void CodeCompletePreprocessorExpression();
6757   void CodeCompletePreprocessorMacroArgument(Scope *S,
6758                                              IdentifierInfo *Macro,
6759                                              MacroInfo *MacroInfo,
6760                                              unsigned Argument);
6761   void CodeCompleteNaturalLanguage();
6762   void GatherGlobalCodeCompletions(CodeCompletionAllocator &Allocator,
6763                                    CodeCompletionTUInfo &CCTUInfo,
6764                   SmallVectorImpl<CodeCompletionResult> &Results);
6765   //@}
6766 
6767   //===--------------------------------------------------------------------===//
6768   // Extra semantic analysis beyond the C type system
6769 
6770 public:
6771   SourceLocation getLocationOfStringLiteralByte(const StringLiteral *SL,
6772                                                 unsigned ByteNo) const;
6773 
6774 private:
6775   void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
6776                         const ArraySubscriptExpr *ASE=0,
6777                         bool AllowOnePastEnd=true, bool IndexNegated=false);
6778   void CheckArrayAccess(const Expr *E);
6779   bool CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall);
6780   bool CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation loc,
6781                            Expr **Args, unsigned NumArgs);
6782   bool CheckBlockCall(NamedDecl *NDecl, CallExpr *TheCall);
6783 
6784   bool CheckObjCString(Expr *Arg);
6785 
6786   ExprResult CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
6787   bool CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall);
6788 
6789   bool SemaBuiltinVAStart(CallExpr *TheCall);
6790   bool SemaBuiltinUnorderedCompare(CallExpr *TheCall);
6791   bool SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs);
6792 
6793 public:
6794   // Used by C++ template instantiation.
6795   ExprResult SemaBuiltinShuffleVector(CallExpr *TheCall);
6796 
6797 private:
6798   bool SemaBuiltinPrefetch(CallExpr *TheCall);
6799   bool SemaBuiltinObjectSize(CallExpr *TheCall);
6800   bool SemaBuiltinLongjmp(CallExpr *TheCall);
6801   ExprResult SemaBuiltinAtomicOverloaded(ExprResult TheCallResult);
6802   ExprResult SemaAtomicOpsOverloaded(ExprResult TheCallResult,
6803                                      AtomicExpr::AtomicOp Op);
6804   bool SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
6805                               llvm::APSInt &Result);
6806 
6807   enum FormatStringType {
6808     FST_Scanf,
6809     FST_Printf,
6810     FST_NSString,
6811     FST_Strftime,
6812     FST_Strfmon,
6813     FST_Kprintf,
6814     FST_Unknown
6815   };
6816   static FormatStringType GetFormatStringType(const FormatAttr *Format);
6817   bool SemaCheckStringLiteral(const Expr *E, Expr **Args, unsigned NumArgs,
6818                               bool HasVAListArg, unsigned format_idx,
6819                               unsigned firstDataArg, FormatStringType Type,
6820                               bool inFunctionCall = true);
6821 
6822   void CheckFormatString(const StringLiteral *FExpr, const Expr *OrigFormatExpr,
6823                          Expr **Args, unsigned NumArgs, bool HasVAListArg,
6824                          unsigned format_idx, unsigned firstDataArg,
6825                          FormatStringType Type, bool inFunctionCall);
6826 
6827   void CheckFormatArguments(const FormatAttr *Format, CallExpr *TheCall);
6828   void CheckFormatArguments(const FormatAttr *Format, Expr **Args,
6829                             unsigned NumArgs, bool IsCXXMember,
6830                             SourceLocation Loc, SourceRange Range);
6831   void CheckFormatArguments(Expr **Args, unsigned NumArgs,
6832                             bool HasVAListArg, unsigned format_idx,
6833                             unsigned firstDataArg, FormatStringType Type,
6834                             SourceLocation Loc, SourceRange range);
6835 
6836   void CheckNonNullArguments(const NonNullAttr *NonNull,
6837                              const Expr * const *ExprArgs,
6838                              SourceLocation CallSiteLoc);
6839 
6840   void CheckMemaccessArguments(const CallExpr *Call,
6841                                unsigned BId,
6842                                IdentifierInfo *FnName);
6843 
6844   void CheckStrlcpycatArguments(const CallExpr *Call,
6845                                 IdentifierInfo *FnName);
6846 
6847   void CheckStrncatArguments(const CallExpr *Call,
6848                              IdentifierInfo *FnName);
6849 
6850   void CheckReturnStackAddr(Expr *RetValExp, QualType lhsType,
6851                             SourceLocation ReturnLoc);
6852   void CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr* RHS);
6853   void CheckImplicitConversions(Expr *E, SourceLocation CC = SourceLocation());
6854 
6855   void CheckBitFieldInitialization(SourceLocation InitLoc, FieldDecl *Field,
6856                                    Expr *Init);
6857 
6858   /// \brief The parser's current scope.
6859   ///
6860   /// The parser maintains this state here.
6861   Scope *CurScope;
6862 
6863 protected:
6864   friend class Parser;
6865   friend class InitializationSequence;
6866   friend class ASTReader;
6867   friend class ASTWriter;
6868 
6869 public:
6870   /// \brief Retrieve the parser's current scope.
6871   ///
6872   /// This routine must only be used when it is certain that semantic analysis
6873   /// and the parser are in precisely the same context, which is not the case
6874   /// when, e.g., we are performing any kind of template instantiation.
6875   /// Therefore, the only safe places to use this scope are in the parser
6876   /// itself and in routines directly invoked from the parser and *never* from
6877   /// template substitution or instantiation.
getCurScope()6878   Scope *getCurScope() const { return CurScope; }
6879 
6880   Decl *getObjCDeclContext() const;
6881 
getCurLexicalContext()6882   DeclContext *getCurLexicalContext() const {
6883     return OriginalLexicalContext ? OriginalLexicalContext : CurContext;
6884   }
6885 
6886   AvailabilityResult getCurContextAvailability() const;
6887 };
6888 
6889 /// \brief RAII object that enters a new expression evaluation context.
6890 class EnterExpressionEvaluationContext {
6891   Sema &Actions;
6892 
6893 public:
6894   EnterExpressionEvaluationContext(Sema &Actions,
6895                                    Sema::ExpressionEvaluationContext NewContext,
6896                                    Decl *LambdaContextDecl = 0,
6897                                    bool IsDecltype = false)
Actions(Actions)6898     : Actions(Actions) {
6899     Actions.PushExpressionEvaluationContext(NewContext, LambdaContextDecl,
6900                                             IsDecltype);
6901   }
6902 
~EnterExpressionEvaluationContext()6903   ~EnterExpressionEvaluationContext() {
6904     Actions.PopExpressionEvaluationContext();
6905   }
6906 };
6907 
6908 }  // end namespace clang
6909 
6910 #endif
6911