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Sema.h
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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/AST/Attr.h"
19 #include "clang/AST/Availability.h"
21 #include "clang/AST/DeclTemplate.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/ExprObjC.h"
25 #include "clang/AST/LocInfoType.h"
27 #include "clang/AST/NSAPI.h"
29 #include "clang/AST/StmtCXX.h"
30 #include "clang/AST/TypeLoc.h"
31 #include "clang/AST/TypeOrdering.h"
34 #include "clang/Basic/Module.h"
37 #include "clang/Basic/Specifiers.h"
39 #include "clang/Basic/TypeTraits.h"
41 #include "clang/Sema/CleanupInfo.h"
42 #include "clang/Sema/DeclSpec.h"
46 #include "clang/Sema/Ownership.h"
47 #include "clang/Sema/Scope.h"
48 #include "clang/Sema/ScopeInfo.h"
50 #include "clang/Sema/Weak.h"
51 #include "llvm/ADT/ArrayRef.h"
52 #include "llvm/ADT/Optional.h"
53 #include "llvm/ADT/SetVector.h"
54 #include "llvm/ADT/SmallPtrSet.h"
55 #include "llvm/ADT/SmallVector.h"
56 #include "llvm/ADT/TinyPtrVector.h"
57 #include <deque>
58 #include <memory>
59 #include <string>
60 #include <vector>
61 
62 namespace llvm {
63  class APSInt;
64  template <typename ValueT> struct DenseMapInfo;
65  template <typename ValueT, typename ValueInfoT> class DenseSet;
66  class SmallBitVector;
67  struct InlineAsmIdentifierInfo;
68 }
69 
70 namespace clang {
71  class ADLResult;
72  class ASTConsumer;
73  class ASTContext;
74  class ASTMutationListener;
75  class ASTReader;
76  class ASTWriter;
77  class ArrayType;
78  class AttributeList;
79  class BindingDecl;
80  class BlockDecl;
81  class CapturedDecl;
82  class CXXBasePath;
83  class CXXBasePaths;
84  class CXXBindTemporaryExpr;
86  class CXXConstructorDecl;
87  class CXXConversionDecl;
88  class CXXDeleteExpr;
89  class CXXDestructorDecl;
90  class CXXFieldCollector;
91  class CXXMemberCallExpr;
92  class CXXMethodDecl;
93  class CXXScopeSpec;
94  class CXXTemporary;
95  class CXXTryStmt;
96  class CallExpr;
97  class ClassTemplateDecl;
98  class ClassTemplatePartialSpecializationDecl;
99  class ClassTemplateSpecializationDecl;
100  class VarTemplatePartialSpecializationDecl;
101  class CodeCompleteConsumer;
102  class CodeCompletionAllocator;
103  class CodeCompletionTUInfo;
104  class CodeCompletionResult;
105  class CoroutineBodyStmt;
106  class Decl;
107  class DeclAccessPair;
108  class DeclContext;
109  class DeclRefExpr;
110  class DeclaratorDecl;
111  class DeducedTemplateArgument;
112  class DependentDiagnostic;
113  class DesignatedInitExpr;
114  class Designation;
115  class EnableIfAttr;
116  class EnumConstantDecl;
117  class Expr;
118  class ExtVectorType;
119  class FormatAttr;
120  class FriendDecl;
121  class FunctionDecl;
122  class FunctionProtoType;
123  class FunctionTemplateDecl;
124  class ImplicitConversionSequence;
126  class InitListExpr;
127  class InitializationKind;
128  class InitializationSequence;
129  class InitializedEntity;
130  class IntegerLiteral;
131  class LabelStmt;
132  class LambdaExpr;
133  class LangOptions;
134  class LocalInstantiationScope;
135  class LookupResult;
136  class MacroInfo;
138  class ModuleLoader;
139  class MultiLevelTemplateArgumentList;
140  class NamedDecl;
141  class ObjCCategoryDecl;
142  class ObjCCategoryImplDecl;
143  class ObjCCompatibleAliasDecl;
144  class ObjCContainerDecl;
145  class ObjCImplDecl;
146  class ObjCImplementationDecl;
147  class ObjCInterfaceDecl;
148  class ObjCIvarDecl;
149  template <class T> class ObjCList;
150  class ObjCMessageExpr;
151  class ObjCMethodDecl;
152  class ObjCPropertyDecl;
153  class ObjCProtocolDecl;
154  class OMPThreadPrivateDecl;
155  class OMPDeclareReductionDecl;
156  class OMPDeclareSimdDecl;
157  class OMPClause;
158  struct OverloadCandidate;
159  class OverloadCandidateSet;
160  class OverloadExpr;
161  class ParenListExpr;
162  class ParmVarDecl;
163  class Preprocessor;
164  class PseudoDestructorTypeStorage;
165  class PseudoObjectExpr;
166  class QualType;
167  class StandardConversionSequence;
168  class Stmt;
169  class StringLiteral;
170  class SwitchStmt;
171  class TemplateArgument;
172  class TemplateArgumentList;
173  class TemplateArgumentLoc;
174  class TemplateDecl;
175  class TemplateParameterList;
176  class TemplatePartialOrderingContext;
177  class TemplateTemplateParmDecl;
178  class Token;
179  class TypeAliasDecl;
180  class TypedefDecl;
181  class TypedefNameDecl;
182  class TypeLoc;
183  class TypoCorrectionConsumer;
184  class UnqualifiedId;
185  class UnresolvedLookupExpr;
186  class UnresolvedMemberExpr;
187  class UnresolvedSetImpl;
188  class UnresolvedSetIterator;
189  class UsingDecl;
190  class UsingShadowDecl;
191  class ValueDecl;
192  class VarDecl;
193  class VarTemplateSpecializationDecl;
194  class VisibilityAttr;
195  class VisibleDeclConsumer;
196  class IndirectFieldDecl;
197  struct DeductionFailureInfo;
198  class TemplateSpecCandidateSet;
199 
200 namespace sema {
201  class AccessedEntity;
202  class BlockScopeInfo;
203  class CapturedRegionScopeInfo;
204  class CapturingScopeInfo;
205  class CompoundScopeInfo;
206  class DelayedDiagnostic;
207  class DelayedDiagnosticPool;
208  class FunctionScopeInfo;
209  class LambdaScopeInfo;
210  class PossiblyUnreachableDiag;
211  class SemaPPCallbacks;
212  class TemplateDeductionInfo;
213 }
214 
215 namespace threadSafety {
216  class BeforeSet;
217  void threadSafetyCleanup(BeforeSet* Cache);
218 }
219 
220 // FIXME: No way to easily map from TemplateTypeParmTypes to
221 // TemplateTypeParmDecls, so we have this horrible PointerUnion.
222 typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
224 
225 /// Describes whether we've seen any nullability information for the given
226 /// file.
228  /// The first pointer declarator (of any pointer kind) in the file that does
229  /// not have a corresponding nullability annotation.
231 
232  /// The end location for the first pointer declarator in the file. Used for
233  /// placing fix-its.
235 
236  /// Which kind of pointer declarator we saw.
237  uint8_t PointerKind;
238 
239  /// Whether we saw any type nullability annotations in the given file.
240  bool SawTypeNullability = false;
241 };
242 
243 /// A mapping from file IDs to a record of whether we've seen nullability
244 /// information in that file.
246  /// A mapping from file IDs to the nullability information for each file ID.
247  llvm::DenseMap<FileID, FileNullability> Map;
248 
249  /// A single-element cache based on the file ID.
250  struct {
253  } Cache;
254 
255 public:
257  // Check the single-element cache.
258  if (file == Cache.File)
259  return Cache.Nullability;
260 
261  // It's not in the single-element cache; flush the cache if we have one.
262  if (!Cache.File.isInvalid()) {
263  Map[Cache.File] = Cache.Nullability;
264  }
265 
266  // Pull this entry into the cache.
267  Cache.File = file;
268  Cache.Nullability = Map[file];
269  return Cache.Nullability;
270  }
271 };
272 
273 /// Sema - This implements semantic analysis and AST building for C.
274 class Sema {
275  Sema(const Sema &) = delete;
276  void operator=(const Sema &) = delete;
277 
278  ///\brief Source of additional semantic information.
279  ExternalSemaSource *ExternalSource;
280 
281  ///\brief Whether Sema has generated a multiplexer and has to delete it.
282  bool isMultiplexExternalSource;
283 
284  static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
285 
286  bool isVisibleSlow(const NamedDecl *D);
287 
288  /// Determine whether two declarations should be linked together, given that
289  /// the old declaration might not be visible and the new declaration might
290  /// not have external linkage.
291  bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
292  const NamedDecl *New) {
293  if (isVisible(Old))
294  return true;
295  // See comment in below overload for why it's safe to compute the linkage
296  // of the new declaration here.
297  if (New->isExternallyDeclarable()) {
298  assert(Old->isExternallyDeclarable() &&
299  "should not have found a non-externally-declarable previous decl");
300  return true;
301  }
302  return false;
303  }
304  bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);
305 
306 public:
310 
313 
320 
321  /// \brief Flag indicating whether or not to collect detailed statistics.
323 
324  /// \brief Code-completion consumer.
326 
327  /// CurContext - This is the current declaration context of parsing.
329 
330  /// \brief Generally null except when we temporarily switch decl contexts,
331  /// like in \see ActOnObjCTemporaryExitContainerContext.
333 
334  /// VAListTagName - The declaration name corresponding to __va_list_tag.
335  /// This is used as part of a hack to omit that class from ADL results.
337 
338  bool MSStructPragmaOn; // True when \#pragma ms_struct on
339 
340  /// \brief Controls member pointer representation format under the MS ABI.
343 
344  /// Stack of active SEH __finally scopes. Can be empty.
346 
347  /// \brief Source location for newly created implicit MSInheritanceAttrs
349 
350  /// \brief pragma clang section kind
352  PCSK_Invalid = 0,
353  PCSK_BSS = 1,
354  PCSK_Data = 2,
355  PCSK_Rodata = 3,
356  PCSK_Text = 4
357  };
358 
360  PCSA_Set = 0,
361  PCSA_Clear = 1
362  };
363 
365  std::string SectionName;
366  bool Valid = false;
368 
369  void Act(SourceLocation PragmaLocation,
371  StringLiteral* Name);
372  };
373 
378 
380  PSK_Reset = 0x0, // #pragma ()
381  PSK_Set = 0x1, // #pragma (value)
382  PSK_Push = 0x2, // #pragma (push[, id])
383  PSK_Pop = 0x4, // #pragma (pop[, id])
384  PSK_Show = 0x8, // #pragma (show) -- only for "pack"!
385  PSK_Push_Set = PSK_Push | PSK_Set, // #pragma (push[, id], value)
386  PSK_Pop_Set = PSK_Pop | PSK_Set, // #pragma (pop[, id], value)
387  };
388 
389  template<typename ValueType>
390  struct PragmaStack {
391  struct Slot {
392  llvm::StringRef StackSlotLabel;
393  ValueType Value;
396  Slot(llvm::StringRef StackSlotLabel, ValueType Value,
397  SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
398  : StackSlotLabel(StackSlotLabel), Value(Value),
399  PragmaLocation(PragmaLocation),
400  PragmaPushLocation(PragmaPushLocation) {}
401  };
402  void Act(SourceLocation PragmaLocation,
403  PragmaMsStackAction Action,
404  llvm::StringRef StackSlotLabel,
405  ValueType Value);
406 
407  // MSVC seems to add artificial slots to #pragma stacks on entering a C++
408  // method body to restore the stacks on exit, so it works like this:
409  //
410  // struct S {
411  // #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
412  // void Method {}
413  // #pragma <name>(pop, InternalPragmaSlot)
414  // };
415  //
416  // It works even with #pragma vtordisp, although MSVC doesn't support
417  // #pragma vtordisp(push [, id], n)
418  // syntax.
419  //
420  // Push / pop a named sentinel slot.
421  void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
422  assert((Action == PSK_Push || Action == PSK_Pop) &&
423  "Can only push / pop #pragma stack sentinels!");
424  Act(CurrentPragmaLocation, Action, Label, CurrentValue);
425  }
426 
427  // Constructors.
428  explicit PragmaStack(const ValueType &Default)
429  : DefaultValue(Default), CurrentValue(Default) {}
430 
431  bool hasValue() const { return CurrentValue != DefaultValue; }
432 
434  ValueType DefaultValue; // Value used for PSK_Reset action.
435  ValueType CurrentValue;
437  };
438  // FIXME: We should serialize / deserialize these if they occur in a PCH (but
439  // we shouldn't do so if they're in a module).
440 
441  /// \brief Whether to insert vtordisps prior to virtual bases in the Microsoft
442  /// C++ ABI. Possible values are 0, 1, and 2, which mean:
443  ///
444  /// 0: Suppress all vtordisps
445  /// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
446  /// structors
447  /// 2: Always insert vtordisps to support RTTI on partially constructed
448  /// objects
450  // #pragma pack.
451  // Sentinel to represent when the stack is set to mac68k alignment.
452  static const unsigned kMac68kAlignmentSentinel = ~0U;
454  // The current #pragma pack values and locations at each #include.
456  unsigned CurrentValue;
458  bool HasNonDefaultValue, ShouldWarnOnInclude;
459  };
461  // Segment #pragmas.
466 
467  // RAII object to push / pop sentinel slots for all MS #pragma stacks.
468  // Actions should be performed only if we enter / exit a C++ method body.
470  public:
471  PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
473 
474  private:
475  Sema &S;
476  StringRef SlotLabel;
477  bool ShouldAct;
478  };
479 
480  /// A mapping that describes the nullability we've seen in each header file.
482 
483  /// Last section used with #pragma init_seg.
486 
487  /// VisContext - Manages the stack for \#pragma GCC visibility.
488  void *VisContext; // Really a "PragmaVisStack*"
489 
490  /// \brief This represents the stack of attributes that were pushed by
491  /// \#pragma clang attribute.
496  bool IsUsed;
497  };
499 
500  /// \brief The declaration that is currently receiving an attribute from the
501  /// #pragma attribute stack.
503 
504  /// \brief This represents the last location of a "#pragma clang optimize off"
505  /// directive if such a directive has not been closed by an "on" yet. If
506  /// optimizations are currently "on", this is set to an invalid location.
508 
509  /// \brief Flag indicating if Sema is building a recovery call expression.
510  ///
511  /// This flag is used to avoid building recovery call expressions
512  /// if Sema is already doing so, which would cause infinite recursions.
514 
515  /// Used to control the generation of ExprWithCleanups.
517 
518  /// ExprCleanupObjects - This is the stack of objects requiring
519  /// cleanup that are created by the current full expression. The
520  /// element type here is ExprWithCleanups::Object.
522 
523  /// \brief Store a list of either DeclRefExprs or MemberExprs
524  /// that contain a reference to a variable (constant) that may or may not
525  /// be odr-used in this Expr, and we won't know until all lvalue-to-rvalue
526  /// and discarded value conversions have been applied to all subexpressions
527  /// of the enclosing full expression. This is cleared at the end of each
528  /// full expression.
529  llvm::SmallPtrSet<Expr*, 2> MaybeODRUseExprs;
530 
531  /// \brief Stack containing information about each of the nested
532  /// function, block, and method scopes that are currently active.
533  ///
534  /// This array is never empty. Clients should ignore the first
535  /// element, which is used to cache a single FunctionScopeInfo
536  /// that's used to parse every top-level function.
538 
540  &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
542 
543  /// ExtVectorDecls - This is a list all the extended vector types. This allows
544  /// us to associate a raw vector type with one of the ext_vector type names.
545  /// This is only necessary for issuing pretty diagnostics.
547 
548  /// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
549  std::unique_ptr<CXXFieldCollector> FieldCollector;
550 
552 
553  /// \brief Set containing all declared private fields that are not used.
554  NamedDeclSetType UnusedPrivateFields;
555 
556  /// \brief Set containing all typedefs that are likely unused.
559 
560  /// \brief Delete-expressions to be analyzed at the end of translation unit
561  ///
562  /// This list contains class members, and locations of delete-expressions
563  /// that could not be proven as to whether they mismatch with new-expression
564  /// used in initializer of the field.
565  typedef std::pair<SourceLocation, bool> DeleteExprLoc;
567  llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;
568 
569  typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
570 
571  /// PureVirtualClassDiagSet - a set of class declarations which we have
572  /// emitted a list of pure virtual functions. Used to prevent emitting the
573  /// same list more than once.
574  std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;
575 
576  /// ParsingInitForAutoVars - a set of declarations with auto types for which
577  /// we are currently parsing the initializer.
578  llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
579 
580  /// \brief Look for a locally scoped extern "C" declaration by the given name.
581  NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);
582 
583  typedef LazyVector<VarDecl *, ExternalSemaSource,
584  &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
586 
587  /// \brief All the tentative definitions encountered in the TU.
589 
590  typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
591  &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
593 
594  /// \brief The set of file scoped decls seen so far that have not been used
595  /// and must warn if not used. Only contains the first declaration.
597 
598  typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
599  &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
601 
602  /// \brief All the delegating constructors seen so far in the file, used for
603  /// cycle detection at the end of the TU.
605 
606  /// \brief All the overriding functions seen during a class definition
607  /// that had their exception spec checks delayed, plus the overridden
608  /// function.
611 
612  /// \brief All the members seen during a class definition which were both
613  /// explicitly defaulted and had explicitly-specified exception
614  /// specifications, along with the function type containing their
615  /// user-specified exception specification. Those exception specifications
616  /// were overridden with the default specifications, but we still need to
617  /// check whether they are compatible with the default specification, and
618  /// we can't do that until the nesting set of class definitions is complete.
621 
622  typedef llvm::MapVector<const FunctionDecl *,
623  std::unique_ptr<LateParsedTemplate>>
626 
627  /// \brief Callback to the parser to parse templated functions when needed.
628  typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
629  typedef void LateTemplateParserCleanupCB(void *P);
630  LateTemplateParserCB *LateTemplateParser;
631  LateTemplateParserCleanupCB *LateTemplateParserCleanup;
633 
634  void SetLateTemplateParser(LateTemplateParserCB *LTP,
635  LateTemplateParserCleanupCB *LTPCleanup,
636  void *P) {
637  LateTemplateParser = LTP;
638  LateTemplateParserCleanup = LTPCleanup;
639  OpaqueParser = P;
640  }
641 
642  class DelayedDiagnostics;
643 
645  sema::DelayedDiagnosticPool *SavedPool;
647  };
650 
651  /// A class which encapsulates the logic for delaying diagnostics
652  /// during parsing and other processing.
654  /// \brief The current pool of diagnostics into which delayed
655  /// diagnostics should go.
657 
658  public:
659  DelayedDiagnostics() : CurPool(nullptr) {}
660 
661  /// Adds a delayed diagnostic.
662  void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h
663 
664  /// Determines whether diagnostics should be delayed.
665  bool shouldDelayDiagnostics() { return CurPool != nullptr; }
666 
667  /// Returns the current delayed-diagnostics pool.
669  return CurPool;
670  }
671 
672  /// Enter a new scope. Access and deprecation diagnostics will be
673  /// collected in this pool.
676  state.SavedPool = CurPool;
677  CurPool = &pool;
678  return state;
679  }
680 
681  /// Leave a delayed-diagnostic state that was previously pushed.
682  /// Do not emit any of the diagnostics. This is performed as part
683  /// of the bookkeeping of popping a pool "properly".
685  CurPool = state.SavedPool;
686  }
687 
688  /// Enter a new scope where access and deprecation diagnostics are
689  /// not delayed.
692  state.SavedPool = CurPool;
693  CurPool = nullptr;
694  return state;
695  }
696 
697  /// Undo a previous pushUndelayed().
699  assert(CurPool == nullptr);
700  CurPool = state.SavedPool;
701  }
703 
704  /// A RAII object to temporarily push a declaration context.
705  class ContextRAII {
706  private:
707  Sema &S;
708  DeclContext *SavedContext;
709  ProcessingContextState SavedContextState;
710  QualType SavedCXXThisTypeOverride;
711 
712  public:
713  ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
714  : S(S), SavedContext(S.CurContext),
715  SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
716  SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
717  {
718  assert(ContextToPush && "pushing null context");
719  S.CurContext = ContextToPush;
720  if (NewThisContext)
722  }
723 
724  void pop() {
725  if (!SavedContext) return;
726  S.CurContext = SavedContext;
727  S.DelayedDiagnostics.popUndelayed(SavedContextState);
728  S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
729  SavedContext = nullptr;
730  }
731 
733  pop();
734  }
735  };
736 
737  /// \brief RAII object to handle the state changes required to synthesize
738  /// a function body.
740  Sema &S;
741  Sema::ContextRAII SavedContext;
742  bool PushedCodeSynthesisContext = false;
743 
744  public:
746  : S(S), SavedContext(S, DC) {
747  S.PushFunctionScope();
749  Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
750  if (auto *FD = dyn_cast<FunctionDecl>(DC))
751  FD->setWillHaveBody(true);
752  else
753  assert(isa<ObjCMethodDecl>(DC));
754  }
755 
757  assert(!PushedCodeSynthesisContext);
758 
760  Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
761  Ctx.PointOfInstantiation = UseLoc;
762  Ctx.Entity = cast<Decl>(S.CurContext);
764 
765  PushedCodeSynthesisContext = true;
766  }
767 
769  if (PushedCodeSynthesisContext)
771  if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
772  FD->setWillHaveBody(false);
775  }
776  };
777 
778  /// WeakUndeclaredIdentifiers - Identifiers contained in
779  /// \#pragma weak before declared. rare. may alias another
780  /// identifier, declared or undeclared
781  llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;
782 
783  /// ExtnameUndeclaredIdentifiers - Identifiers contained in
784  /// \#pragma redefine_extname before declared. Used in Solaris system headers
785  /// to define functions that occur in multiple standards to call the version
786  /// in the currently selected standard.
787  llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;
788 
789 
790  /// \brief Load weak undeclared identifiers from the external source.
791  void LoadExternalWeakUndeclaredIdentifiers();
792 
793  /// WeakTopLevelDecl - Translation-unit scoped declarations generated by
794  /// \#pragma weak during processing of other Decls.
795  /// I couldn't figure out a clean way to generate these in-line, so
796  /// we store them here and handle separately -- which is a hack.
797  /// It would be best to refactor this.
799 
801 
802  /// Translation Unit Scope - useful to Objective-C actions that need
803  /// to lookup file scope declarations in the "ordinary" C decl namespace.
804  /// For example, user-defined classes, built-in "id" type, etc.
806 
807  /// \brief The C++ "std" namespace, where the standard library resides.
809 
810  /// \brief The C++ "std::bad_alloc" class, which is defined by the C++
811  /// standard library.
813 
814  /// \brief The C++ "std::align_val_t" enum class, which is defined by the C++
815  /// standard library.
817 
818  /// \brief The C++ "std::experimental" namespace, where the experimental parts
819  /// of the standard library resides.
821 
822  /// \brief The C++ "std::initializer_list" template, which is defined in
823  /// <initializer_list>.
825 
826  /// \brief The C++ "type_info" declaration, which is defined in <typeinfo>.
828 
829  /// \brief The MSVC "_GUID" struct, which is defined in MSVC header files.
831 
832  /// \brief Caches identifiers/selectors for NSFoundation APIs.
833  std::unique_ptr<NSAPI> NSAPIObj;
834 
835  /// \brief The declaration of the Objective-C NSNumber class.
837 
838  /// \brief The declaration of the Objective-C NSValue class.
840 
841  /// \brief Pointer to NSNumber type (NSNumber *).
843 
844  /// \brief Pointer to NSValue type (NSValue *).
846 
847  /// \brief The Objective-C NSNumber methods used to create NSNumber literals.
848  ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
849 
850  /// \brief The declaration of the Objective-C NSString class.
852 
853  /// \brief Pointer to NSString type (NSString *).
855 
856  /// \brief The declaration of the stringWithUTF8String: method.
858 
859  /// \brief The declaration of the valueWithBytes:objCType: method.
861 
862  /// \brief The declaration of the Objective-C NSArray class.
864 
865  /// \brief The declaration of the arrayWithObjects:count: method.
867 
868  /// \brief The declaration of the Objective-C NSDictionary class.
870 
871  /// \brief The declaration of the dictionaryWithObjects:forKeys:count: method.
873 
874  /// \brief id<NSCopying> type.
876 
877  /// \brief will hold 'respondsToSelector:'
879 
880  /// A flag to remember whether the implicit forms of operator new and delete
881  /// have been declared.
883 
884  /// A flag to indicate that we're in a context that permits abstract
885  /// references to fields. This is really a
887 
888  /// \brief Describes how the expressions currently being parsed are
889  /// evaluated at run-time, if at all.
891  /// \brief The current expression and its subexpressions occur within an
892  /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
893  /// \c sizeof, where the type of the expression may be significant but
894  /// no code will be generated to evaluate the value of the expression at
895  /// run time.
896  Unevaluated,
897 
898  /// \brief The current expression occurs within a braced-init-list within
899  /// an unevaluated operand. This is mostly like a regular unevaluated
900  /// context, except that we still instantiate constexpr functions that are
901  /// referenced here so that we can perform narrowing checks correctly.
902  UnevaluatedList,
903 
904  /// \brief The current expression occurs within a discarded statement.
905  /// This behaves largely similarly to an unevaluated operand in preventing
906  /// definitions from being required, but not in other ways.
907  DiscardedStatement,
908 
909  /// \brief The current expression occurs within an unevaluated
910  /// operand that unconditionally permits abstract references to
911  /// fields, such as a SIZE operator in MS-style inline assembly.
912  UnevaluatedAbstract,
913 
914  /// \brief The current context is "potentially evaluated" in C++11 terms,
915  /// but the expression is evaluated at compile-time (like the values of
916  /// cases in a switch statement).
917  ConstantEvaluated,
918 
919  /// \brief The current expression is potentially evaluated at run time,
920  /// which means that code may be generated to evaluate the value of the
921  /// expression at run time.
922  PotentiallyEvaluated,
923 
924  /// \brief The current expression is potentially evaluated, but any
925  /// declarations referenced inside that expression are only used if
926  /// in fact the current expression is used.
927  ///
928  /// This value is used when parsing default function arguments, for which
929  /// we would like to provide diagnostics (e.g., passing non-POD arguments
930  /// through varargs) but do not want to mark declarations as "referenced"
931  /// until the default argument is used.
932  PotentiallyEvaluatedIfUsed
933  };
934 
935  /// \brief Data structure used to record current or nested
936  /// expression evaluation contexts.
938  /// \brief The expression evaluation context.
940 
941  /// \brief Whether the enclosing context needed a cleanup.
943 
944  /// \brief Whether we are in a decltype expression.
946 
947  /// \brief The number of active cleanup objects when we entered
948  /// this expression evaluation context.
950 
951  /// \brief The number of typos encountered during this expression evaluation
952  /// context (i.e. the number of TypoExprs created).
953  unsigned NumTypos;
954 
955  llvm::SmallPtrSet<Expr*, 2> SavedMaybeODRUseExprs;
956 
957  /// \brief The lambdas that are present within this context, if it
958  /// is indeed an unevaluated context.
960 
961  /// \brief The declaration that provides context for lambda expressions
962  /// and block literals if the normal declaration context does not
963  /// suffice, e.g., in a default function argument.
965 
966  /// \brief The context information used to mangle lambda expressions
967  /// and block literals within this context.
968  ///
969  /// This mangling information is allocated lazily, since most contexts
970  /// do not have lambda expressions or block literals.
971  std::unique_ptr<MangleNumberingContext> MangleNumbering;
972 
973  /// \brief If we are processing a decltype type, a set of call expressions
974  /// for which we have deferred checking the completeness of the return type.
976 
977  /// \brief If we are processing a decltype type, a set of temporary binding
978  /// expressions for which we have deferred checking the destructor.
980 
982  unsigned NumCleanupObjects,
983  CleanupInfo ParentCleanup,
984  Decl *ManglingContextDecl,
985  bool IsDecltype)
986  : Context(Context), ParentCleanup(ParentCleanup),
987  IsDecltype(IsDecltype), NumCleanupObjects(NumCleanupObjects),
988  NumTypos(0),
989  ManglingContextDecl(ManglingContextDecl), MangleNumbering() { }
990 
991  /// \brief Retrieve the mangling numbering context, used to consistently
992  /// number constructs like lambdas for mangling.
993  MangleNumberingContext &getMangleNumberingContext(ASTContext &Ctx);
994 
995  bool isUnevaluated() const {
996  return Context == ExpressionEvaluationContext::Unevaluated ||
997  Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
998  Context == ExpressionEvaluationContext::UnevaluatedList;
999  }
1000  bool isConstantEvaluated() const {
1001  return Context == ExpressionEvaluationContext::ConstantEvaluated;
1002  }
1003  };
1004 
1005  /// A stack of expression evaluation contexts.
1007 
1008  /// \brief Compute the mangling number context for a lambda expression or
1009  /// block literal.
1010  ///
1011  /// \param DC - The DeclContext containing the lambda expression or
1012  /// block literal.
1013  /// \param[out] ManglingContextDecl - Returns the ManglingContextDecl
1014  /// associated with the context, if relevant.
1015  MangleNumberingContext *getCurrentMangleNumberContext(
1016  const DeclContext *DC,
1017  Decl *&ManglingContextDecl);
1018 
1019 
1020  /// SpecialMemberOverloadResult - The overloading result for a special member
1021  /// function.
1022  ///
1023  /// This is basically a wrapper around PointerIntPair. The lowest bits of the
1024  /// integer are used to determine whether overload resolution succeeded.
1026  public:
1027  enum Kind {
1030  Success
1031  };
1032 
1033  private:
1034  llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
1035 
1036  public:
1039  : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}
1040 
1041  CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
1042  void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
1043 
1044  Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
1045  void setKind(Kind K) { Pair.setInt(K); }
1046  };
1047 
1049  : public llvm::FastFoldingSetNode,
1051  public:
1052  SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
1053  : FastFoldingSetNode(ID)
1054  {}
1055  };
1056 
1057  /// \brief A cache of special member function overload resolution results
1058  /// for C++ records.
1059  llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;
1060 
1061  /// \brief A cache of the flags available in enumerations with the flag_bits
1062  /// attribute.
1063  mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;
1064 
1065  /// \brief The kind of translation unit we are processing.
1066  ///
1067  /// When we're processing a complete translation unit, Sema will perform
1068  /// end-of-translation-unit semantic tasks (such as creating
1069  /// initializers for tentative definitions in C) once parsing has
1070  /// completed. Modules and precompiled headers perform different kinds of
1071  /// checks.
1073 
1074  llvm::BumpPtrAllocator BumpAlloc;
1075 
1076  /// \brief The number of SFINAE diagnostics that have been trapped.
1078 
1079  typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
1081 
1082  /// \brief A mapping from parameters with unparsed default arguments to the
1083  /// set of instantiations of each parameter.
1084  ///
1085  /// This mapping is a temporary data structure used when parsing
1086  /// nested class templates or nested classes of class templates,
1087  /// where we might end up instantiating an inner class before the
1088  /// default arguments of its methods have been parsed.
1090 
1091  // Contains the locations of the beginning of unparsed default
1092  // argument locations.
1093  llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;
1094 
1095  /// UndefinedInternals - all the used, undefined objects which require a
1096  /// definition in this translation unit.
1097  llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;
1098 
1099  /// Determine if VD, which must be a variable or function, is an external
1100  /// symbol that nonetheless can't be referenced from outside this translation
1101  /// unit because its type has no linkage and it's not extern "C".
1102  bool isExternalWithNoLinkageType(ValueDecl *VD);
1103 
1104  /// Obtain a sorted list of functions that are undefined but ODR-used.
1105  void getUndefinedButUsed(
1106  SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);
1107 
1108  /// Retrieves list of suspicious delete-expressions that will be checked at
1109  /// the end of translation unit.
1110  const llvm::MapVector<FieldDecl *, DeleteLocs> &
1111  getMismatchingDeleteExpressions() const;
1112 
1113  typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
1114  typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
1115 
1116  /// Method Pool - allows efficient lookup when typechecking messages to "id".
1117  /// We need to maintain a list, since selectors can have differing signatures
1118  /// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
1119  /// of selectors are "overloaded").
1120  /// At the head of the list it is recorded whether there were 0, 1, or >= 2
1121  /// methods inside categories with a particular selector.
1122  GlobalMethodPool MethodPool;
1123 
1124  /// Method selectors used in a \@selector expression. Used for implementation
1125  /// of -Wselector.
1126  llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;
1127 
1128  /// Kinds of C++ special members.
1136  CXXInvalid
1137  };
1138 
1139  typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
1141 
1142  /// The C++ special members which we are currently in the process of
1143  /// declaring. If this process recursively triggers the declaration of the
1144  /// same special member, we should act as if it is not yet declared.
1145  llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;
1146 
1147  /// The function definitions which were renamed as part of typo-correction
1148  /// to match their respective declarations. We want to keep track of them
1149  /// to ensure that we don't emit a "redefinition" error if we encounter a
1150  /// correctly named definition after the renamed definition.
1151  llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;
1152 
1153  /// Stack of types that correspond to the parameter entities that are
1154  /// currently being copy-initialized. Can be empty.
1156 
1157  void ReadMethodPool(Selector Sel);
1158  void updateOutOfDateSelector(Selector Sel);
1159 
1160  /// Private Helper predicate to check for 'self'.
1161  bool isSelfExpr(Expr *RExpr);
1162  bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);
1163 
1164  /// \brief Cause the active diagnostic on the DiagosticsEngine to be
1165  /// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
1166  /// should not be used elsewhere.
1167  void EmitCurrentDiagnostic(unsigned DiagID);
1168 
1169  /// Records and restores the FP_CONTRACT state on entry/exit of compound
1170  /// statements.
1172  public:
1173  FPContractStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
1174  ~FPContractStateRAII() { S.FPFeatures = OldFPFeaturesState; }
1175 
1176  private:
1177  Sema& S;
1178  FPOptions OldFPFeaturesState;
1179  };
1180 
1181  void addImplicitTypedef(StringRef Name, QualType T);
1182 
1183 public:
1184  Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
1186  CodeCompleteConsumer *CompletionConsumer = nullptr);
1187  ~Sema();
1188 
1189  /// \brief Perform initialization that occurs after the parser has been
1190  /// initialized but before it parses anything.
1191  void Initialize();
1192 
1193  const LangOptions &getLangOpts() const { return LangOpts; }
1194  OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
1195  FPOptions &getFPOptions() { return FPFeatures; }
1196 
1197  DiagnosticsEngine &getDiagnostics() const { return Diags; }
1198  SourceManager &getSourceManager() const { return SourceMgr; }
1199  Preprocessor &getPreprocessor() const { return PP; }
1200  ASTContext &getASTContext() const { return Context; }
1201  ASTConsumer &getASTConsumer() const { return Consumer; }
1202  ASTMutationListener *getASTMutationListener() const;
1203  ExternalSemaSource* getExternalSource() const { return ExternalSource; }
1204 
1205  ///\brief Registers an external source. If an external source already exists,
1206  /// creates a multiplex external source and appends to it.
1207  ///
1208  ///\param[in] E - A non-null external sema source.
1209  ///
1210  void addExternalSource(ExternalSemaSource *E);
1211 
1212  void PrintStats() const;
1213 
1214  /// \brief Helper class that creates diagnostics with optional
1215  /// template instantiation stacks.
1216  ///
1217  /// This class provides a wrapper around the basic DiagnosticBuilder
1218  /// class that emits diagnostics. SemaDiagnosticBuilder is
1219  /// responsible for emitting the diagnostic (as DiagnosticBuilder
1220  /// does) and, if the diagnostic comes from inside a template
1221  /// instantiation, printing the template instantiation stack as
1222  /// well.
1224  Sema &SemaRef;
1225  unsigned DiagID;
1226 
1227  public:
1228  SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
1229  : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }
1230 
1231  // This is a cunning lie. DiagnosticBuilder actually performs move
1232  // construction in its copy constructor (but due to varied uses, it's not
1233  // possible to conveniently express this as actual move construction). So
1234  // the default copy ctor here is fine, because the base class disables the
1235  // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
1236  // in that case anwyay.
1237  SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;
1238 
1240  // If we aren't active, there is nothing to do.
1241  if (!isActive()) return;
1242 
1243  // Otherwise, we need to emit the diagnostic. First flush the underlying
1244  // DiagnosticBuilder data, and clear the diagnostic builder itself so it
1245  // won't emit the diagnostic in its own destructor.
1246  //
1247  // This seems wasteful, in that as written the DiagnosticBuilder dtor will
1248  // do its own needless checks to see if the diagnostic needs to be
1249  // emitted. However, because we take care to ensure that the builder
1250  // objects never escape, a sufficiently smart compiler will be able to
1251  // eliminate that code.
1252  FlushCounts();
1253  Clear();
1254 
1255  // Dispatch to Sema to emit the diagnostic.
1256  SemaRef.EmitCurrentDiagnostic(DiagID);
1257  }
1258 
1259  /// Teach operator<< to produce an object of the correct type.
1260  template<typename T>
1262  const SemaDiagnosticBuilder &Diag, const T &Value) {
1263  const DiagnosticBuilder &BaseDiag = Diag;
1264  BaseDiag << Value;
1265  return Diag;
1266  }
1267  };
1268 
1269  /// \brief Emit a diagnostic.
1271  DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
1272  return SemaDiagnosticBuilder(DB, *this, DiagID);
1273  }
1274 
1275  /// \brief Emit a partial diagnostic.
1277 
1278  /// \brief Build a partial diagnostic.
1279  PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
1280 
1281  bool findMacroSpelling(SourceLocation &loc, StringRef name);
1282 
1283  /// \brief Get a string to suggest for zero-initialization of a type.
1284  std::string
1285  getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
1286  std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;
1287 
1288  /// \brief Calls \c Lexer::getLocForEndOfToken()
1289  SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);
1290 
1291  /// \brief Retrieve the module loader associated with the preprocessor.
1292  ModuleLoader &getModuleLoader() const;
1293 
1294  void emitAndClearUnusedLocalTypedefWarnings();
1295 
1296  void ActOnStartOfTranslationUnit();
1297  void ActOnEndOfTranslationUnit();
1298 
1299  void CheckDelegatingCtorCycles();
1300 
1301  Scope *getScopeForContext(DeclContext *Ctx);
1302 
1303  void PushFunctionScope();
1304  void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
1305  sema::LambdaScopeInfo *PushLambdaScope();
1306 
1307  /// \brief This is used to inform Sema what the current TemplateParameterDepth
1308  /// is during Parsing. Currently it is used to pass on the depth
1309  /// when parsing generic lambda 'auto' parameters.
1310  void RecordParsingTemplateParameterDepth(unsigned Depth);
1311 
1312  void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
1313  RecordDecl *RD,
1314  CapturedRegionKind K);
1315  void
1316  PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
1317  const Decl *D = nullptr,
1318  const BlockExpr *blkExpr = nullptr);
1319 
1321  return FunctionScopes.back();
1322  }
1323 
1325  if (FunctionScopes.empty())
1326  return nullptr;
1327 
1328  for (int e = FunctionScopes.size()-1; e >= 0; --e) {
1329  if (isa<sema::BlockScopeInfo>(FunctionScopes[e]))
1330  continue;
1331  return FunctionScopes[e];
1332  }
1333  return nullptr;
1334  }
1335 
1336  template <typename ExprT>
1337  void recordUseOfEvaluatedWeak(const ExprT *E, bool IsRead=true) {
1338  if (!isUnevaluatedContext())
1339  getCurFunction()->recordUseOfWeak(E, IsRead);
1340  }
1341 
1342  void PushCompoundScope();
1343  void PopCompoundScope();
1344 
1345  sema::CompoundScopeInfo &getCurCompoundScope() const;
1346 
1347  bool hasAnyUnrecoverableErrorsInThisFunction() const;
1348 
1349  /// \brief Retrieve the current block, if any.
1350  sema::BlockScopeInfo *getCurBlock();
1351 
1352  /// Retrieve the current lambda scope info, if any.
1353  /// \param IgnoreNonLambdaCapturingScope true if should find the top-most
1354  /// lambda scope info ignoring all inner capturing scopes that are not
1355  /// lambda scopes.
1357  getCurLambda(bool IgnoreNonLambdaCapturingScope = false);
1358 
1359  /// \brief Retrieve the current generic lambda info, if any.
1360  sema::LambdaScopeInfo *getCurGenericLambda();
1361 
1362  /// \brief Retrieve the current captured region, if any.
1363  sema::CapturedRegionScopeInfo *getCurCapturedRegion();
1364 
1365  /// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
1366  SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
1367 
1368  void ActOnComment(SourceRange Comment);
1369 
1370  //===--------------------------------------------------------------------===//
1371  // Type Analysis / Processing: SemaType.cpp.
1372  //
1373 
1374  QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
1375  const DeclSpec *DS = nullptr);
1376  QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
1377  const DeclSpec *DS = nullptr);
1378  QualType BuildPointerType(QualType T,
1379  SourceLocation Loc, DeclarationName Entity);
1380  QualType BuildReferenceType(QualType T, bool LValueRef,
1381  SourceLocation Loc, DeclarationName Entity);
1382  QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1383  Expr *ArraySize, unsigned Quals,
1384  SourceRange Brackets, DeclarationName Entity);
1385  QualType BuildExtVectorType(QualType T, Expr *ArraySize,
1386  SourceLocation AttrLoc);
1387  QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
1388  SourceLocation AttrLoc);
1389 
1390  bool CheckFunctionReturnType(QualType T, SourceLocation Loc);
1391 
1392  /// \brief Build a function type.
1393  ///
1394  /// This routine checks the function type according to C++ rules and
1395  /// under the assumption that the result type and parameter types have
1396  /// just been instantiated from a template. It therefore duplicates
1397  /// some of the behavior of GetTypeForDeclarator, but in a much
1398  /// simpler form that is only suitable for this narrow use case.
1399  ///
1400  /// \param T The return type of the function.
1401  ///
1402  /// \param ParamTypes The parameter types of the function. This array
1403  /// will be modified to account for adjustments to the types of the
1404  /// function parameters.
1405  ///
1406  /// \param Loc The location of the entity whose type involves this
1407  /// function type or, if there is no such entity, the location of the
1408  /// type that will have function type.
1409  ///
1410  /// \param Entity The name of the entity that involves the function
1411  /// type, if known.
1412  ///
1413  /// \param EPI Extra information about the function type. Usually this will
1414  /// be taken from an existing function with the same prototype.
1415  ///
1416  /// \returns A suitable function type, if there are no errors. The
1417  /// unqualified type will always be a FunctionProtoType.
1418  /// Otherwise, returns a NULL type.
1419  QualType BuildFunctionType(QualType T,
1420  MutableArrayRef<QualType> ParamTypes,
1421  SourceLocation Loc, DeclarationName Entity,
1422  const FunctionProtoType::ExtProtoInfo &EPI);
1423 
1424  QualType BuildMemberPointerType(QualType T, QualType Class,
1425  SourceLocation Loc,
1426  DeclarationName Entity);
1427  QualType BuildBlockPointerType(QualType T,
1428  SourceLocation Loc, DeclarationName Entity);
1429  QualType BuildParenType(QualType T);
1430  QualType BuildAtomicType(QualType T, SourceLocation Loc);
1431  QualType BuildReadPipeType(QualType T,
1432  SourceLocation Loc);
1433  QualType BuildWritePipeType(QualType T,
1434  SourceLocation Loc);
1435 
1436  TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
1437  TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
1438  TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
1439  TypeSourceInfo *ReturnTypeInfo);
1440 
1441  /// \brief Package the given type and TSI into a ParsedType.
1442  ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
1443  DeclarationNameInfo GetNameForDeclarator(Declarator &D);
1444  DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
1445  static QualType GetTypeFromParser(ParsedType Ty,
1446  TypeSourceInfo **TInfo = nullptr);
1447  CanThrowResult canThrow(const Expr *E);
1448  const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
1449  const FunctionProtoType *FPT);
1450  void UpdateExceptionSpec(FunctionDecl *FD,
1452  bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
1453  bool CheckDistantExceptionSpec(QualType T);
1454  bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
1455  bool CheckEquivalentExceptionSpec(
1456  const FunctionProtoType *Old, SourceLocation OldLoc,
1457  const FunctionProtoType *New, SourceLocation NewLoc);
1458  bool CheckEquivalentExceptionSpec(
1459  const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
1460  const FunctionProtoType *Old, SourceLocation OldLoc,
1461  const FunctionProtoType *New, SourceLocation NewLoc);
1462  bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
1463  const PartialDiagnostic &NestedDiagID,
1464  const PartialDiagnostic &NoteID,
1465  const FunctionProtoType *Superset,
1466  SourceLocation SuperLoc,
1467  const FunctionProtoType *Subset,
1468  SourceLocation SubLoc);
1469  bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
1470  const PartialDiagnostic &NoteID,
1471  const FunctionProtoType *Target,
1472  SourceLocation TargetLoc,
1473  const FunctionProtoType *Source,
1474  SourceLocation SourceLoc);
1475 
1476  TypeResult ActOnTypeName(Scope *S, Declarator &D);
1477 
1478  /// \brief The parser has parsed the context-sensitive type 'instancetype'
1479  /// in an Objective-C message declaration. Return the appropriate type.
1480  ParsedType ActOnObjCInstanceType(SourceLocation Loc);
1481 
1482  /// \brief Abstract class used to diagnose incomplete types.
1483  struct TypeDiagnoser {
1485 
1486  virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
1487  virtual ~TypeDiagnoser() {}
1488  };
1489 
1490  static int getPrintable(int I) { return I; }
1491  static unsigned getPrintable(unsigned I) { return I; }
1492  static bool getPrintable(bool B) { return B; }
1493  static const char * getPrintable(const char *S) { return S; }
1494  static StringRef getPrintable(StringRef S) { return S; }
1495  static const std::string &getPrintable(const std::string &S) { return S; }
1496  static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
1497  return II;
1498  }
1500  static QualType getPrintable(QualType T) { return T; }
1501  static SourceRange getPrintable(SourceRange R) { return R; }
1502  static SourceRange getPrintable(SourceLocation L) { return L; }
1503  static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
1504  static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}
1505 
1506  template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
1507  unsigned DiagID;
1508  std::tuple<const Ts &...> Args;
1509 
1510  template <std::size_t... Is>
1511  void emit(const SemaDiagnosticBuilder &DB,
1512  llvm::index_sequence<Is...>) const {
1513  // Apply all tuple elements to the builder in order.
1514  bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
1515  (void)Dummy;
1516  }
1517 
1518  public:
1519  BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
1520  : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
1521  assert(DiagID != 0 && "no diagnostic for type diagnoser");
1522  }
1523 
1524  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
1525  const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
1526  emit(DB, llvm::index_sequence_for<Ts...>());
1527  DB << T;
1528  }
1529  };
1530 
1531 private:
1532  bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
1533  TypeDiagnoser *Diagnoser);
1534 
1535  struct ModuleScope {
1536  clang::Module *Module = nullptr;
1537  bool ModuleInterface = false;
1538  VisibleModuleSet OuterVisibleModules;
1539  };
1540  /// The modules we're currently parsing.
1542 
1543  /// Get the module whose scope we are currently within.
1544  Module *getCurrentModule() const {
1545  return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
1546  }
1547 
1548  VisibleModuleSet VisibleModules;
1549 
1550 public:
1551  /// \brief Get the module owning an entity.
1552  Module *getOwningModule(Decl *Entity) { return Entity->getOwningModule(); }
1553 
1554  /// \brief Make a merged definition of an existing hidden definition \p ND
1555  /// visible at the specified location.
1556  void makeMergedDefinitionVisible(NamedDecl *ND);
1557 
1558  bool isModuleVisible(const Module *M) { return VisibleModules.isVisible(M); }
1559 
1560  /// Determine whether a declaration is visible to name lookup.
1561  bool isVisible(const NamedDecl *D) {
1562  return !D->isHidden() || isVisibleSlow(D);
1563  }
1564 
1565  /// Determine whether any declaration of an entity is visible.
1566  bool
1568  llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
1569  return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
1570  }
1571  bool hasVisibleDeclarationSlow(const NamedDecl *D,
1573 
1574  bool hasVisibleMergedDefinition(NamedDecl *Def);
1575  bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);
1576 
1577  /// Determine if \p D and \p Suggested have a structurally compatible
1578  /// layout as described in C11 6.2.7/1.
1579  bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);
1580 
1581  /// Determine if \p D has a visible definition. If not, suggest a declaration
1582  /// that should be made visible to expose the definition.
1583  bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
1584  bool OnlyNeedComplete = false);
1586  NamedDecl *Hidden;
1587  return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
1588  }
1589 
1590  /// Determine if the template parameter \p D has a visible default argument.
1591  bool
1593  llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1594 
1595  /// Determine if there is a visible declaration of \p D that is an explicit
1596  /// specialization declaration for a specialization of a template. (For a
1597  /// member specialization, use hasVisibleMemberSpecialization.)
1598  bool hasVisibleExplicitSpecialization(
1599  const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1600 
1601  /// Determine if there is a visible declaration of \p D that is a member
1602  /// specialization declaration (as opposed to an instantiated declaration).
1603  bool hasVisibleMemberSpecialization(
1604  const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1605 
1606  /// Determine if \p A and \p B are equivalent internal linkage declarations
1607  /// from different modules, and thus an ambiguity error can be downgraded to
1608  /// an extension warning.
1609  bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
1610  const NamedDecl *B);
1611  void diagnoseEquivalentInternalLinkageDeclarations(
1612  SourceLocation Loc, const NamedDecl *D,
1614 
1616  return !RequireCompleteTypeImpl(Loc, T, nullptr);
1617  }
1618  bool RequireCompleteType(SourceLocation Loc, QualType T,
1619  TypeDiagnoser &Diagnoser);
1620  bool RequireCompleteType(SourceLocation Loc, QualType T,
1621  unsigned DiagID);
1622 
1623  template <typename... Ts>
1624  bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
1625  const Ts &...Args) {
1626  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1627  return RequireCompleteType(Loc, T, Diagnoser);
1628  }
1629 
1630  void completeExprArrayBound(Expr *E);
1631  bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
1632  bool RequireCompleteExprType(Expr *E, unsigned DiagID);
1633 
1634  template <typename... Ts>
1635  bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
1636  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1637  return RequireCompleteExprType(E, Diagnoser);
1638  }
1639 
1640  bool RequireLiteralType(SourceLocation Loc, QualType T,
1641  TypeDiagnoser &Diagnoser);
1642  bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);
1643 
1644  template <typename... Ts>
1645  bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
1646  const Ts &...Args) {
1647  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1648  return RequireLiteralType(Loc, T, Diagnoser);
1649  }
1650 
1651  QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
1652  const CXXScopeSpec &SS, QualType T);
1653 
1654  QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
1655  /// If AsUnevaluated is false, E is treated as though it were an evaluated
1656  /// context, such as when building a type for decltype(auto).
1657  QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
1658  bool AsUnevaluated = true);
1659  QualType BuildUnaryTransformType(QualType BaseType,
1661  SourceLocation Loc);
1662 
1663  //===--------------------------------------------------------------------===//
1664  // Symbol table / Decl tracking callbacks: SemaDecl.cpp.
1665  //
1666 
1667  struct SkipBodyInfo {
1669  : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
1670  New(nullptr) {}
1675  };
1676 
1677  DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);
1678 
1679  void DiagnoseUseOfUnimplementedSelectors();
1680 
1681  bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;
1682 
1684  Scope *S, CXXScopeSpec *SS = nullptr,
1685  bool isClassName = false, bool HasTrailingDot = false,
1686  ParsedType ObjectType = nullptr,
1687  bool IsCtorOrDtorName = false,
1688  bool WantNontrivialTypeSourceInfo = false,
1689  bool IsClassTemplateDeductionContext = true,
1690  IdentifierInfo **CorrectedII = nullptr);
1691  TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
1692  bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
1693  void DiagnoseUnknownTypeName(IdentifierInfo *&II,
1694  SourceLocation IILoc,
1695  Scope *S,
1696  CXXScopeSpec *SS,
1697  ParsedType &SuggestedType,
1698  bool IsTemplateName = false);
1699 
1700  /// Attempt to behave like MSVC in situations where lookup of an unqualified
1701  /// type name has failed in a dependent context. In these situations, we
1702  /// automatically form a DependentTypeName that will retry lookup in a related
1703  /// scope during instantiation.
1704  ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
1705  SourceLocation NameLoc,
1706  bool IsTemplateTypeArg);
1707 
1708  /// \brief Describes the result of the name lookup and resolution performed
1709  /// by \c ClassifyName().
1719  NC_FunctionTemplate
1720  };
1721 
1724  ExprResult Expr;
1725  TemplateName Template;
1726  ParsedType Type;
1727 
1728  explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}
1729 
1730  public:
1731  NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}
1732 
1733  NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}
1734 
1735  NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}
1736 
1738  return NameClassification(NC_Error);
1739  }
1740 
1742  return NameClassification(NC_Unknown);
1743  }
1744 
1746  return NameClassification(NC_NestedNameSpecifier);
1747  }
1748 
1750  NameClassification Result(NC_TypeTemplate);
1751  Result.Template = Name;
1752  return Result;
1753  }
1754 
1756  NameClassification Result(NC_VarTemplate);
1757  Result.Template = Name;
1758  return Result;
1759  }
1760 
1762  NameClassification Result(NC_FunctionTemplate);
1763  Result.Template = Name;
1764  return Result;
1765  }
1766 
1768 
1770  assert(Kind == NC_Type);
1771  return Type;
1772  }
1773 
1775  assert(Kind == NC_Expression);
1776  return Expr;
1777  }
1778 
1780  assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||
1781  Kind == NC_VarTemplate);
1782  return Template;
1783  }
1784 
1786  switch (Kind) {
1787  case NC_TypeTemplate:
1788  return TNK_Type_template;
1789  case NC_FunctionTemplate:
1790  return TNK_Function_template;
1791  case NC_VarTemplate:
1792  return TNK_Var_template;
1793  default:
1794  llvm_unreachable("unsupported name classification.");
1795  }
1796  }
1797  };
1798 
1799  /// \brief Perform name lookup on the given name, classifying it based on
1800  /// the results of name lookup and the following token.
1801  ///
1802  /// This routine is used by the parser to resolve identifiers and help direct
1803  /// parsing. When the identifier cannot be found, this routine will attempt
1804  /// to correct the typo and classify based on the resulting name.
1805  ///
1806  /// \param S The scope in which we're performing name lookup.
1807  ///
1808  /// \param SS The nested-name-specifier that precedes the name.
1809  ///
1810  /// \param Name The identifier. If typo correction finds an alternative name,
1811  /// this pointer parameter will be updated accordingly.
1812  ///
1813  /// \param NameLoc The location of the identifier.
1814  ///
1815  /// \param NextToken The token following the identifier. Used to help
1816  /// disambiguate the name.
1817  ///
1818  /// \param IsAddressOfOperand True if this name is the operand of a unary
1819  /// address of ('&') expression, assuming it is classified as an
1820  /// expression.
1821  ///
1822  /// \param CCC The correction callback, if typo correction is desired.
1824  ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name,
1825  SourceLocation NameLoc, const Token &NextToken,
1826  bool IsAddressOfOperand,
1827  std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr);
1828 
1829  /// Describes the detailed kind of a template name. Used in diagnostics.
1831  ClassTemplate,
1832  FunctionTemplate,
1833  VarTemplate,
1834  AliasTemplate,
1835  TemplateTemplateParam,
1836  DependentTemplate
1837  };
1839  getTemplateNameKindForDiagnostics(TemplateName Name);
1840 
1841  /// Determine whether it's plausible that E was intended to be a
1842  /// template-name.
1844  if (!getLangOpts().CPlusPlus || E.isInvalid())
1845  return false;
1846  if (auto *DRE = dyn_cast<DeclRefExpr>(E.get()))
1847  return !DRE->hasExplicitTemplateArgs();
1848  if (auto *ME = dyn_cast<MemberExpr>(E.get()))
1849  return !ME->hasExplicitTemplateArgs();
1850  // Any additional cases recognized here should also be handled by
1851  // diagnoseExprIntendedAsTemplateName.
1852  return false;
1853  }
1854  void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
1855  SourceLocation Less,
1856  SourceLocation Greater);
1857 
1858  Decl *ActOnDeclarator(Scope *S, Declarator &D);
1859 
1860  NamedDecl *HandleDeclarator(Scope *S, Declarator &D,
1861  MultiTemplateParamsArg TemplateParameterLists);
1862  void RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S);
1863  bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
1864  bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
1865  DeclarationName Name,
1866  SourceLocation Loc);
1867  void
1868  diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
1869  SourceLocation FallbackLoc,
1870  SourceLocation ConstQualLoc = SourceLocation(),
1871  SourceLocation VolatileQualLoc = SourceLocation(),
1872  SourceLocation RestrictQualLoc = SourceLocation(),
1873  SourceLocation AtomicQualLoc = SourceLocation(),
1874  SourceLocation UnalignedQualLoc = SourceLocation());
1875 
1876  static bool adjustContextForLocalExternDecl(DeclContext *&DC);
1877  void DiagnoseFunctionSpecifiers(const DeclSpec &DS);
1878  NamedDecl *getShadowedDeclaration(const TypedefNameDecl *D,
1879  const LookupResult &R);
1880  NamedDecl *getShadowedDeclaration(const VarDecl *D, const LookupResult &R);
1881  void CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl,
1882  const LookupResult &R);
1883  void CheckShadow(Scope *S, VarDecl *D);
1884 
1885  /// Warn if 'E', which is an expression that is about to be modified, refers
1886  /// to a shadowing declaration.
1887  void CheckShadowingDeclModification(Expr *E, SourceLocation Loc);
1888 
1889  void DiagnoseShadowingLambdaDecls(const sema::LambdaScopeInfo *LSI);
1890 
1891 private:
1892  /// Map of current shadowing declarations to shadowed declarations. Warn if
1893  /// it looks like the user is trying to modify the shadowing declaration.
1894  llvm::DenseMap<const NamedDecl *, const NamedDecl *> ShadowingDecls;
1895 
1896 public:
1897  void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
1898  void handleTagNumbering(const TagDecl *Tag, Scope *TagScope);
1899  void setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
1900  TypedefNameDecl *NewTD);
1901  void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
1902  NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1903  TypeSourceInfo *TInfo,
1905  NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
1906  LookupResult &Previous, bool &Redeclaration);
1907  NamedDecl *ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
1908  TypeSourceInfo *TInfo,
1909  LookupResult &Previous,
1910  MultiTemplateParamsArg TemplateParamLists,
1911  bool &AddToScope,
1912  ArrayRef<BindingDecl *> Bindings = None);
1913  NamedDecl *
1914  ActOnDecompositionDeclarator(Scope *S, Declarator &D,
1915  MultiTemplateParamsArg TemplateParamLists);
1916  // Returns true if the variable declaration is a redeclaration
1917  bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
1918  void CheckVariableDeclarationType(VarDecl *NewVD);
1919  bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
1920  Expr *Init);
1921  void CheckCompleteVariableDeclaration(VarDecl *VD);
1922  void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
1923  void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);
1924 
1925  NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1926  TypeSourceInfo *TInfo,
1927  LookupResult &Previous,
1928  MultiTemplateParamsArg TemplateParamLists,
1929  bool &AddToScope);
1930  bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);
1931 
1932  bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
1933  bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);
1934 
1935  void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD);
1936  void FindHiddenVirtualMethods(CXXMethodDecl *MD,
1937  SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
1938  void NoteHiddenVirtualMethods(CXXMethodDecl *MD,
1939  SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
1940  // Returns true if the function declaration is a redeclaration
1941  bool CheckFunctionDeclaration(Scope *S,
1942  FunctionDecl *NewFD, LookupResult &Previous,
1943  bool IsMemberSpecialization);
1944  bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
1945  void CheckMain(FunctionDecl *FD, const DeclSpec &D);
1946  void CheckMSVCRTEntryPoint(FunctionDecl *FD);
1947  Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
1948  ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
1949  SourceLocation Loc,
1950  QualType T);
1951  ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
1952  SourceLocation NameLoc, IdentifierInfo *Name,
1953  QualType T, TypeSourceInfo *TSInfo,
1954  StorageClass SC);
1955  void ActOnParamDefaultArgument(Decl *param,
1956  SourceLocation EqualLoc,
1957  Expr *defarg);
1958  void ActOnParamUnparsedDefaultArgument(Decl *param,
1959  SourceLocation EqualLoc,
1960  SourceLocation ArgLoc);
1961  void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc);
1962  bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
1963  SourceLocation EqualLoc);
1964 
1965  void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit);
1966  void ActOnUninitializedDecl(Decl *dcl);
1967  void ActOnInitializerError(Decl *Dcl);
1968 
1969  void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc);
1970  void ActOnCXXForRangeDecl(Decl *D);
1971  StmtResult ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
1972  IdentifierInfo *Ident,
1973  ParsedAttributes &Attrs,
1974  SourceLocation AttrEnd);
1975  void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
1976  void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
1977  void FinalizeDeclaration(Decl *D);
1978  DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
1979  ArrayRef<Decl *> Group);
1980  DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef<Decl *> Group);
1981 
1982  /// Should be called on all declarations that might have attached
1983  /// documentation comments.
1984  void ActOnDocumentableDecl(Decl *D);
1985  void ActOnDocumentableDecls(ArrayRef<Decl *> Group);
1986 
1987  void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
1988  SourceLocation LocAfterDecls);
1989  void CheckForFunctionRedefinition(
1990  FunctionDecl *FD, const FunctionDecl *EffectiveDefinition = nullptr,
1991  SkipBodyInfo *SkipBody = nullptr);
1992  Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D,
1993  MultiTemplateParamsArg TemplateParamLists,
1994  SkipBodyInfo *SkipBody = nullptr);
1995  Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D,
1996  SkipBodyInfo *SkipBody = nullptr);
1997  void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
1999  return D && isa<ObjCMethodDecl>(D);
2000  }
2001 
2002  /// \brief Determine whether we can delay parsing the body of a function or
2003  /// function template until it is used, assuming we don't care about emitting
2004  /// code for that function.
2005  ///
2006  /// This will be \c false if we may need the body of the function in the
2007  /// middle of parsing an expression (where it's impractical to switch to
2008  /// parsing a different function), for instance, if it's constexpr in C++11
2009  /// or has an 'auto' return type in C++14. These cases are essentially bugs.
2010  bool canDelayFunctionBody(const Declarator &D);
2011 
2012  /// \brief Determine whether we can skip parsing the body of a function
2013  /// definition, assuming we don't care about analyzing its body or emitting
2014  /// code for that function.
2015  ///
2016  /// This will be \c false only if we may need the body of the function in
2017  /// order to parse the rest of the program (for instance, if it is
2018  /// \c constexpr in C++11 or has an 'auto' return type in C++14).
2019  bool canSkipFunctionBody(Decl *D);
2020 
2021  void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
2022  Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
2023  Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
2024  Decl *ActOnSkippedFunctionBody(Decl *Decl);
2025  void ActOnFinishInlineFunctionDef(FunctionDecl *D);
2026 
2027  /// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
2028  /// attribute for which parsing is delayed.
2029  void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);
2030 
2031  /// \brief Diagnose any unused parameters in the given sequence of
2032  /// ParmVarDecl pointers.
2033  void DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters);
2034 
2035  /// \brief Diagnose whether the size of parameters or return value of a
2036  /// function or obj-c method definition is pass-by-value and larger than a
2037  /// specified threshold.
2038  void
2039  DiagnoseSizeOfParametersAndReturnValue(ArrayRef<ParmVarDecl *> Parameters,
2040  QualType ReturnTy, NamedDecl *D);
2041 
2042  void DiagnoseInvalidJumps(Stmt *Body);
2043  Decl *ActOnFileScopeAsmDecl(Expr *expr,
2044  SourceLocation AsmLoc,
2045  SourceLocation RParenLoc);
2046 
2047  /// \brief Handle a C++11 empty-declaration and attribute-declaration.
2048  Decl *ActOnEmptyDeclaration(Scope *S,
2049  AttributeList *AttrList,
2050  SourceLocation SemiLoc);
2051 
2052  enum class ModuleDeclKind {
2053  Interface, ///< 'export module X;'
2054  Implementation, ///< 'module X;'
2055  Partition, ///< 'module partition X;'
2056  };
2057 
2058  /// The parser has processed a module-declaration that begins the definition
2059  /// of a module interface or implementation.
2060  DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc,
2061  SourceLocation ModuleLoc, ModuleDeclKind MDK,
2062  ModuleIdPath Path);
2063 
2064  /// \brief The parser has processed a module import declaration.
2065  ///
2066  /// \param AtLoc The location of the '@' symbol, if any.
2067  ///
2068  /// \param ImportLoc The location of the 'import' keyword.
2069  ///
2070  /// \param Path The module access path.
2071  DeclResult ActOnModuleImport(SourceLocation AtLoc, SourceLocation ImportLoc,
2072  ModuleIdPath Path);
2073 
2074  /// \brief The parser has processed a module import translated from a
2075  /// #include or similar preprocessing directive.
2076  void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
2077  void BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
2078 
2079  /// \brief The parsed has entered a submodule.
2080  void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod);
2081  /// \brief The parser has left a submodule.
2082  void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod);
2083 
2084  /// \brief Create an implicit import of the given module at the given
2085  /// source location, for error recovery, if possible.
2086  ///
2087  /// This routine is typically used when an entity found by name lookup
2088  /// is actually hidden within a module that we know about but the user
2089  /// has forgotten to import.
2090  void createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
2091  Module *Mod);
2092 
2093  /// Kinds of missing import. Note, the values of these enumerators correspond
2094  /// to %select values in diagnostics.
2095  enum class MissingImportKind {
2096  Declaration,
2097  Definition,
2098  DefaultArgument,
2099  ExplicitSpecialization,
2100  PartialSpecialization
2101  };
2102 
2103  /// \brief Diagnose that the specified declaration needs to be visible but
2104  /// isn't, and suggest a module import that would resolve the problem.
2105  void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
2106  MissingImportKind MIK, bool Recover = true);
2107  void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
2108  SourceLocation DeclLoc, ArrayRef<Module *> Modules,
2109  MissingImportKind MIK, bool Recover);
2110 
2111  Decl *ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
2112  SourceLocation LBraceLoc);
2113  Decl *ActOnFinishExportDecl(Scope *S, Decl *ExportDecl,
2114  SourceLocation RBraceLoc);
2115 
2116  /// \brief We've found a use of a templated declaration that would trigger an
2117  /// implicit instantiation. Check that any relevant explicit specializations
2118  /// and partial specializations are visible, and diagnose if not.
2119  void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);
2120 
2121  /// \brief We've found a use of a template specialization that would select a
2122  /// partial specialization. Check that the partial specialization is visible,
2123  /// and diagnose if not.
2124  void checkPartialSpecializationVisibility(SourceLocation Loc,
2125  NamedDecl *Spec);
2126 
2127  /// \brief Retrieve a suitable printing policy.
2129  return getPrintingPolicy(Context, PP);
2130  }
2131 
2132  /// \brief Retrieve a suitable printing policy.
2133  static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
2134  const Preprocessor &PP);
2135 
2136  /// Scope actions.
2137  void ActOnPopScope(SourceLocation Loc, Scope *S);
2138  void ActOnTranslationUnitScope(Scope *S);
2139 
2140  Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
2141  RecordDecl *&AnonRecord);
2142  Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
2143  MultiTemplateParamsArg TemplateParams,
2144  bool IsExplicitInstantiation,
2145  RecordDecl *&AnonRecord);
2146 
2147  Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
2148  AccessSpecifier AS,
2149  RecordDecl *Record,
2150  const PrintingPolicy &Policy);
2151 
2152  Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
2153  RecordDecl *Record);
2154 
2155  /// Common ways to introduce type names without a tag for use in diagnostics.
2156  /// Keep in sync with err_tag_reference_non_tag.
2157  enum NonTagKind {
2167  };
2168 
2169  /// Given a non-tag type declaration, returns an enum useful for indicating
2170  /// what kind of non-tag type this is.
2171  NonTagKind getNonTagTypeDeclKind(const Decl *D, TagTypeKind TTK);
2172 
2173  bool isAcceptableTagRedeclaration(const TagDecl *Previous,
2174  TagTypeKind NewTag, bool isDefinition,
2175  SourceLocation NewTagLoc,
2176  const IdentifierInfo *Name);
2177 
2178  enum TagUseKind {
2179  TUK_Reference, // Reference to a tag: 'struct foo *X;'
2180  TUK_Declaration, // Fwd decl of a tag: 'struct foo;'
2181  TUK_Definition, // Definition of a tag: 'struct foo { int X; } Y;'
2182  TUK_Friend // Friend declaration: 'friend struct foo;'
2183  };
2184 
2185  Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
2186  SourceLocation KWLoc, CXXScopeSpec &SS, IdentifierInfo *Name,
2187  SourceLocation NameLoc, AttributeList *Attr,
2188  AccessSpecifier AS, SourceLocation ModulePrivateLoc,
2189  MultiTemplateParamsArg TemplateParameterLists, bool &OwnedDecl,
2190  bool &IsDependent, SourceLocation ScopedEnumKWLoc,
2191  bool ScopedEnumUsesClassTag, TypeResult UnderlyingType,
2192  bool IsTypeSpecifier, bool IsTemplateParamOrArg,
2193  SkipBodyInfo *SkipBody = nullptr);
2194 
2195  Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
2196  unsigned TagSpec, SourceLocation TagLoc,
2197  CXXScopeSpec &SS,
2198  IdentifierInfo *Name, SourceLocation NameLoc,
2200  MultiTemplateParamsArg TempParamLists);
2201 
2202  TypeResult ActOnDependentTag(Scope *S,
2203  unsigned TagSpec,
2204  TagUseKind TUK,
2205  const CXXScopeSpec &SS,
2206  IdentifierInfo *Name,
2207  SourceLocation TagLoc,
2208  SourceLocation NameLoc);
2209 
2210  void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
2211  IdentifierInfo *ClassName,
2212  SmallVectorImpl<Decl *> &Decls);
2213  Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
2214  Declarator &D, Expr *BitfieldWidth);
2215 
2216  FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
2217  Declarator &D, Expr *BitfieldWidth,
2218  InClassInitStyle InitStyle,
2219  AccessSpecifier AS);
2220  MSPropertyDecl *HandleMSProperty(Scope *S, RecordDecl *TagD,
2221  SourceLocation DeclStart,
2222  Declarator &D, Expr *BitfieldWidth,
2223  InClassInitStyle InitStyle,
2224  AccessSpecifier AS,
2225  AttributeList *MSPropertyAttr);
2226 
2227  FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
2228  TypeSourceInfo *TInfo,
2229  RecordDecl *Record, SourceLocation Loc,
2230  bool Mutable, Expr *BitfieldWidth,
2231  InClassInitStyle InitStyle,
2232  SourceLocation TSSL,
2233  AccessSpecifier AS, NamedDecl *PrevDecl,
2234  Declarator *D = nullptr);
2235 
2236  bool CheckNontrivialField(FieldDecl *FD);
2237  void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM);
2238  bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
2239  bool Diagnose = false);
2240  CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
2241  void ActOnLastBitfield(SourceLocation DeclStart,
2242  SmallVectorImpl<Decl *> &AllIvarDecls);
2243  Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
2244  Declarator &D, Expr *BitfieldWidth,
2245  tok::ObjCKeywordKind visibility);
2246 
2247  // This is used for both record definitions and ObjC interface declarations.
2248  void ActOnFields(Scope* S, SourceLocation RecLoc, Decl *TagDecl,
2249  ArrayRef<Decl *> Fields,
2250  SourceLocation LBrac, SourceLocation RBrac,
2251  AttributeList *AttrList);
2252 
2253  /// ActOnTagStartDefinition - Invoked when we have entered the
2254  /// scope of a tag's definition (e.g., for an enumeration, class,
2255  /// struct, or union).
2256  void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);
2257 
2258  /// Perform ODR-like check for C/ObjC when merging tag types from modules.
2259  /// Differently from C++, actually parse the body and reject / error out
2260  /// in case of a structural mismatch.
2261  bool ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev,
2262  SkipBodyInfo &SkipBody);
2263 
2265 
2266  /// \brief Invoked when we enter a tag definition that we're skipping.
2267  SkippedDefinitionContext ActOnTagStartSkippedDefinition(Scope *S, Decl *TD);
2268 
2269  Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);
2270 
2271  /// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
2272  /// C++ record definition's base-specifiers clause and are starting its
2273  /// member declarations.
2274  void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
2275  SourceLocation FinalLoc,
2276  bool IsFinalSpelledSealed,
2277  SourceLocation LBraceLoc);
2278 
2279  /// ActOnTagFinishDefinition - Invoked once we have finished parsing
2280  /// the definition of a tag (enumeration, class, struct, or union).
2281  void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
2282  SourceRange BraceRange);
2283 
2284  void ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context);
2285 
2286  void ActOnObjCContainerFinishDefinition();
2287 
2288  /// \brief Invoked when we must temporarily exit the objective-c container
2289  /// scope for parsing/looking-up C constructs.
2290  ///
2291  /// Must be followed by a call to \see ActOnObjCReenterContainerContext
2292  void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
2293  void ActOnObjCReenterContainerContext(DeclContext *DC);
2294 
2295  /// ActOnTagDefinitionError - Invoked when there was an unrecoverable
2296  /// error parsing the definition of a tag.
2297  void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);
2298 
2299  EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
2300  EnumConstantDecl *LastEnumConst,
2301  SourceLocation IdLoc,
2302  IdentifierInfo *Id,
2303  Expr *val);
2304  bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
2305  bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
2306  QualType EnumUnderlyingTy,
2307  bool EnumUnderlyingIsImplicit,
2308  const EnumDecl *Prev);
2309 
2310  /// Determine whether the body of an anonymous enumeration should be skipped.
2311  /// \param II The name of the first enumerator.
2312  SkipBodyInfo shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
2313  SourceLocation IILoc);
2314 
2315  Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
2317  AttributeList *Attrs, SourceLocation EqualLoc,
2318  Expr *Val);
2319  void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
2320  Decl *EnumDecl,
2321  ArrayRef<Decl *> Elements,
2322  Scope *S, AttributeList *Attr);
2323 
2324  DeclContext *getContainingDC(DeclContext *DC);
2325 
2326  /// Set the current declaration context until it gets popped.
2327  void PushDeclContext(Scope *S, DeclContext *DC);
2328  void PopDeclContext();
2329 
2330  /// EnterDeclaratorContext - Used when we must lookup names in the context
2331  /// of a declarator's nested name specifier.
2332  void EnterDeclaratorContext(Scope *S, DeclContext *DC);
2333  void ExitDeclaratorContext(Scope *S);
2334 
2335  /// Push the parameters of D, which must be a function, into scope.
2336  void ActOnReenterFunctionContext(Scope* S, Decl* D);
2337  void ActOnExitFunctionContext();
2338 
2339  DeclContext *getFunctionLevelDeclContext();
2340 
2341  /// getCurFunctionDecl - If inside of a function body, this returns a pointer
2342  /// to the function decl for the function being parsed. If we're currently
2343  /// in a 'block', this returns the containing context.
2344  FunctionDecl *getCurFunctionDecl();
2345 
2346  /// getCurMethodDecl - If inside of a method body, this returns a pointer to
2347  /// the method decl for the method being parsed. If we're currently
2348  /// in a 'block', this returns the containing context.
2349  ObjCMethodDecl *getCurMethodDecl();
2350 
2351  /// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
2352  /// or C function we're in, otherwise return null. If we're currently
2353  /// in a 'block', this returns the containing context.
2354  NamedDecl *getCurFunctionOrMethodDecl();
2355 
2356  /// Add this decl to the scope shadowed decl chains.
2357  void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);
2358 
2359  /// \brief Make the given externally-produced declaration visible at the
2360  /// top level scope.
2361  ///
2362  /// \param D The externally-produced declaration to push.
2363  ///
2364  /// \param Name The name of the externally-produced declaration.
2365  void pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name);
2366 
2367  /// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
2368  /// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
2369  /// true if 'D' belongs to the given declaration context.
2370  ///
2371  /// \param AllowInlineNamespace If \c true, allow the declaration to be in the
2372  /// enclosing namespace set of the context, rather than contained
2373  /// directly within it.
2374  bool isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S = nullptr,
2375  bool AllowInlineNamespace = false);
2376 
2377  /// Finds the scope corresponding to the given decl context, if it
2378  /// happens to be an enclosing scope. Otherwise return NULL.
2379  static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);
2380 
2381  /// Subroutines of ActOnDeclarator().
2382  TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
2383  TypeSourceInfo *TInfo);
2384  bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);
2385 
2386  /// \brief Describes the kind of merge to perform for availability
2387  /// attributes (including "deprecated", "unavailable", and "availability").
2389  /// \brief Don't merge availability attributes at all.
2391  /// \brief Merge availability attributes for a redeclaration, which requires
2392  /// an exact match.
2394  /// \brief Merge availability attributes for an override, which requires
2395  /// an exact match or a weakening of constraints.
2397  /// \brief Merge availability attributes for an implementation of
2398  /// a protocol requirement.
2400  };
2401 
2402  /// Attribute merging methods. Return true if a new attribute was added.
2403  AvailabilityAttr *mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
2404  IdentifierInfo *Platform,
2405  bool Implicit,
2406  VersionTuple Introduced,
2407  VersionTuple Deprecated,
2408  VersionTuple Obsoleted,
2409  bool IsUnavailable,
2410  StringRef Message,
2411  bool IsStrict, StringRef Replacement,
2413  unsigned AttrSpellingListIndex);
2414  TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
2415  TypeVisibilityAttr::VisibilityType Vis,
2416  unsigned AttrSpellingListIndex);
2417  VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
2418  VisibilityAttr::VisibilityType Vis,
2419  unsigned AttrSpellingListIndex);
2420  UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
2421  unsigned AttrSpellingListIndex, StringRef Uuid);
2422  DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
2423  unsigned AttrSpellingListIndex);
2424  DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
2425  unsigned AttrSpellingListIndex);
2426  MSInheritanceAttr *
2427  mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
2428  unsigned AttrSpellingListIndex,
2429  MSInheritanceAttr::Spelling SemanticSpelling);
2430  FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
2431  IdentifierInfo *Format, int FormatIdx,
2432  int FirstArg, unsigned AttrSpellingListIndex);
2433  SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
2434  unsigned AttrSpellingListIndex);
2435  AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
2436  IdentifierInfo *Ident,
2437  unsigned AttrSpellingListIndex);
2438  MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
2439  unsigned AttrSpellingListIndex);
2440  OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
2441  unsigned AttrSpellingListIndex);
2442  InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, SourceRange Range,
2443  IdentifierInfo *Ident,
2444  unsigned AttrSpellingListIndex);
2445  CommonAttr *mergeCommonAttr(Decl *D, SourceRange Range, IdentifierInfo *Ident,
2446  unsigned AttrSpellingListIndex);
2447 
2448  void mergeDeclAttributes(NamedDecl *New, Decl *Old,
2449  AvailabilityMergeKind AMK = AMK_Redeclaration);
2450  void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
2451  LookupResult &OldDecls);
2452  bool MergeFunctionDecl(FunctionDecl *New, NamedDecl *&Old, Scope *S,
2453  bool MergeTypeWithOld);
2454  bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
2455  Scope *S, bool MergeTypeWithOld);
2456  void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
2457  void MergeVarDecl(VarDecl *New, LookupResult &Previous);
2458  void MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool MergeTypeWithOld);
2459  void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
2460  bool checkVarDeclRedefinition(VarDecl *OldDefn, VarDecl *NewDefn);
2461  void notePreviousDefinition(const NamedDecl *Old, SourceLocation New);
2462  bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);
2463 
2464  // AssignmentAction - This is used by all the assignment diagnostic functions
2465  // to represent what is actually causing the operation
2474  AA_Passing_CFAudited
2475  };
2476 
2477  /// C++ Overloading.
2479  /// This is a legitimate overload: the existing declarations are
2480  /// functions or function templates with different signatures.
2482 
2483  /// This is not an overload because the signature exactly matches
2484  /// an existing declaration.
2486 
2487  /// This is not an overload because the lookup results contain a
2488  /// non-function.
2489  Ovl_NonFunction
2490  };
2491  OverloadKind CheckOverload(Scope *S,
2492  FunctionDecl *New,
2493  const LookupResult &OldDecls,
2494  NamedDecl *&OldDecl,
2495  bool IsForUsingDecl);
2496  bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl,
2497  bool ConsiderCudaAttrs = true);
2498 
2499  /// \brief Checks availability of the function depending on the current
2500  /// function context.Inside an unavailable function,unavailability is ignored.
2501  ///
2502  /// \returns true if \p FD is unavailable and current context is inside
2503  /// an available function, false otherwise.
2504  bool isFunctionConsideredUnavailable(FunctionDecl *FD);
2505 
2507  TryImplicitConversion(Expr *From, QualType ToType,
2508  bool SuppressUserConversions,
2509  bool AllowExplicit,
2510  bool InOverloadResolution,
2511  bool CStyle,
2512  bool AllowObjCWritebackConversion);
2513 
2514  bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
2515  bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
2516  bool IsComplexPromotion(QualType FromType, QualType ToType);
2517  bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
2518  bool InOverloadResolution,
2519  QualType& ConvertedType, bool &IncompatibleObjC);
2520  bool isObjCPointerConversion(QualType FromType, QualType ToType,
2521  QualType& ConvertedType, bool &IncompatibleObjC);
2522  bool isObjCWritebackConversion(QualType FromType, QualType ToType,
2523  QualType &ConvertedType);
2524  bool IsBlockPointerConversion(QualType FromType, QualType ToType,
2525  QualType& ConvertedType);
2526  bool FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
2527  const FunctionProtoType *NewType,
2528  unsigned *ArgPos = nullptr);
2529  void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
2530  QualType FromType, QualType ToType);
2531 
2532  void maybeExtendBlockObject(ExprResult &E);
2533  CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
2534  bool CheckPointerConversion(Expr *From, QualType ToType,
2535  CastKind &Kind,
2536  CXXCastPath& BasePath,
2537  bool IgnoreBaseAccess,
2538  bool Diagnose = true);
2539  bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
2540  bool InOverloadResolution,
2541  QualType &ConvertedType);
2542  bool CheckMemberPointerConversion(Expr *From, QualType ToType,
2543  CastKind &Kind,
2544  CXXCastPath &BasePath,
2545  bool IgnoreBaseAccess);
2546  bool IsQualificationConversion(QualType FromType, QualType ToType,
2547  bool CStyle, bool &ObjCLifetimeConversion);
2548  bool IsFunctionConversion(QualType FromType, QualType ToType,
2549  QualType &ResultTy);
2550  bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
2551  bool isSameOrCompatibleFunctionType(CanQualType Param, CanQualType Arg);
2552 
2553  ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
2554  const VarDecl *NRVOCandidate,
2555  QualType ResultType,
2556  Expr *Value,
2557  bool AllowNRVO = true);
2558 
2559  bool CanPerformCopyInitialization(const InitializedEntity &Entity,
2560  ExprResult Init);
2561  ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
2562  SourceLocation EqualLoc,
2563  ExprResult Init,
2564  bool TopLevelOfInitList = false,
2565  bool AllowExplicit = false);
2566  ExprResult PerformObjectArgumentInitialization(Expr *From,
2567  NestedNameSpecifier *Qualifier,
2568  NamedDecl *FoundDecl,
2569  CXXMethodDecl *Method);
2570 
2571  ExprResult PerformContextuallyConvertToBool(Expr *From);
2572  ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);
2573 
2574  /// Contexts in which a converted constant expression is required.
2575  enum CCEKind {
2576  CCEK_CaseValue, ///< Expression in a case label.
2577  CCEK_Enumerator, ///< Enumerator value with fixed underlying type.
2578  CCEK_TemplateArg, ///< Value of a non-type template parameter.
2579  CCEK_NewExpr, ///< Constant expression in a noptr-new-declarator.
2580  CCEK_ConstexprIf ///< Condition in a constexpr if statement.
2581  };
2583  llvm::APSInt &Value, CCEKind CCE);
2585  APValue &Value, CCEKind CCE);
2586 
2587  /// \brief Abstract base class used to perform a contextual implicit
2588  /// conversion from an expression to any type passing a filter.
2590  public:
2591  bool Suppress;
2593 
2594  ContextualImplicitConverter(bool Suppress = false,
2595  bool SuppressConversion = false)
2596  : Suppress(Suppress), SuppressConversion(SuppressConversion) {}
2597 
2598  /// \brief Determine whether the specified type is a valid destination type
2599  /// for this conversion.
2600  virtual bool match(QualType T) = 0;
2601 
2602  /// \brief Emits a diagnostic complaining that the expression does not have
2603  /// integral or enumeration type.
2604  virtual SemaDiagnosticBuilder
2605  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) = 0;
2606 
2607  /// \brief Emits a diagnostic when the expression has incomplete class type.
2608  virtual SemaDiagnosticBuilder
2609  diagnoseIncomplete(Sema &S, SourceLocation Loc, QualType T) = 0;
2610 
2611  /// \brief Emits a diagnostic when the only matching conversion function
2612  /// is explicit.
2613  virtual SemaDiagnosticBuilder diagnoseExplicitConv(
2614  Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;
2615 
2616  /// \brief Emits a note for the explicit conversion function.
2617  virtual SemaDiagnosticBuilder
2618  noteExplicitConv(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;
2619 
2620  /// \brief Emits a diagnostic when there are multiple possible conversion
2621  /// functions.
2622  virtual SemaDiagnosticBuilder
2623  diagnoseAmbiguous(Sema &S, SourceLocation Loc, QualType T) = 0;
2624 
2625  /// \brief Emits a note for one of the candidate conversions.
2626  virtual SemaDiagnosticBuilder
2627  noteAmbiguous(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;
2628 
2629  /// \brief Emits a diagnostic when we picked a conversion function
2630  /// (for cases when we are not allowed to pick a conversion function).
2631  virtual SemaDiagnosticBuilder diagnoseConversion(
2632  Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;
2633 
2635  };
2636 
2638  bool AllowScopedEnumerations;
2639 
2640  public:
2641  ICEConvertDiagnoser(bool AllowScopedEnumerations,
2642  bool Suppress, bool SuppressConversion)
2643  : ContextualImplicitConverter(Suppress, SuppressConversion),
2644  AllowScopedEnumerations(AllowScopedEnumerations) {}
2645 
2646  /// Match an integral or (possibly scoped) enumeration type.
2647  bool match(QualType T) override;
2648 
2651  return diagnoseNotInt(S, Loc, T);
2652  }
2653 
2654  /// \brief Emits a diagnostic complaining that the expression does not have
2655  /// integral or enumeration type.
2656  virtual SemaDiagnosticBuilder
2657  diagnoseNotInt(Sema &S, SourceLocation Loc, QualType T) = 0;
2658  };
2659 
2660  /// Perform a contextual implicit conversion.
2661  ExprResult PerformContextualImplicitConversion(
2662  SourceLocation Loc, Expr *FromE, ContextualImplicitConverter &Converter);
2663 
2664 
2668  OS_Error
2669  };
2670  ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);
2671 
2672  // Note that LK_String is intentionally after the other literals, as
2673  // this is used for diagnostics logic.
2681  LK_None
2682  };
2683  ObjCLiteralKind CheckLiteralKind(Expr *FromE);
2684 
2685  ExprResult PerformObjectMemberConversion(Expr *From,
2686  NestedNameSpecifier *Qualifier,
2687  NamedDecl *FoundDecl,
2688  NamedDecl *Member);
2689 
2690  // Members have to be NamespaceDecl* or TranslationUnitDecl*.
2691  // TODO: make this is a typesafe union.
2694 
2695  void AddOverloadCandidate(FunctionDecl *Function,
2696  DeclAccessPair FoundDecl,
2697  ArrayRef<Expr *> Args,
2698  OverloadCandidateSet &CandidateSet,
2699  bool SuppressUserConversions = false,
2700  bool PartialOverloading = false,
2701  bool AllowExplicit = false,
2702  ConversionSequenceList EarlyConversions = None);
2703  void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
2704  ArrayRef<Expr *> Args,
2705  OverloadCandidateSet &CandidateSet,
2706  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
2707  bool SuppressUserConversions = false,
2708  bool PartialOverloading = false,
2709  bool FirstArgumentIsBase = false);
2710  void AddMethodCandidate(DeclAccessPair FoundDecl,
2711  QualType ObjectType,
2712  Expr::Classification ObjectClassification,
2713  ArrayRef<Expr *> Args,
2714  OverloadCandidateSet& CandidateSet,
2715  bool SuppressUserConversion = false);
2716  void AddMethodCandidate(CXXMethodDecl *Method,
2717  DeclAccessPair FoundDecl,
2718  CXXRecordDecl *ActingContext, QualType ObjectType,
2719  Expr::Classification ObjectClassification,
2720  ArrayRef<Expr *> Args,
2721  OverloadCandidateSet& CandidateSet,
2722  bool SuppressUserConversions = false,
2723  bool PartialOverloading = false,
2724  ConversionSequenceList EarlyConversions = None);
2725  void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
2726  DeclAccessPair FoundDecl,
2727  CXXRecordDecl *ActingContext,
2728  TemplateArgumentListInfo *ExplicitTemplateArgs,
2729  QualType ObjectType,
2730  Expr::Classification ObjectClassification,
2731  ArrayRef<Expr *> Args,
2732  OverloadCandidateSet& CandidateSet,
2733  bool SuppressUserConversions = false,
2734  bool PartialOverloading = false);
2735  void AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
2736  DeclAccessPair FoundDecl,
2737  TemplateArgumentListInfo *ExplicitTemplateArgs,
2738  ArrayRef<Expr *> Args,
2739  OverloadCandidateSet& CandidateSet,
2740  bool SuppressUserConversions = false,
2741  bool PartialOverloading = false);
2742  bool CheckNonDependentConversions(FunctionTemplateDecl *FunctionTemplate,
2743  ArrayRef<QualType> ParamTypes,
2744  ArrayRef<Expr *> Args,
2745  OverloadCandidateSet &CandidateSet,
2746  ConversionSequenceList &Conversions,
2747  bool SuppressUserConversions,
2748  CXXRecordDecl *ActingContext = nullptr,
2749  QualType ObjectType = QualType(),
2751  ObjectClassification = {});
2752  void AddConversionCandidate(CXXConversionDecl *Conversion,
2753  DeclAccessPair FoundDecl,
2754  CXXRecordDecl *ActingContext,
2755  Expr *From, QualType ToType,
2756  OverloadCandidateSet& CandidateSet,
2757  bool AllowObjCConversionOnExplicit,
2758  bool AllowResultConversion = true);
2759  void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
2760  DeclAccessPair FoundDecl,
2761  CXXRecordDecl *ActingContext,
2762  Expr *From, QualType ToType,
2763  OverloadCandidateSet &CandidateSet,
2764  bool AllowObjCConversionOnExplicit,
2765  bool AllowResultConversion = true);
2766  void AddSurrogateCandidate(CXXConversionDecl *Conversion,
2767  DeclAccessPair FoundDecl,
2768  CXXRecordDecl *ActingContext,
2769  const FunctionProtoType *Proto,
2770  Expr *Object, ArrayRef<Expr *> Args,
2771  OverloadCandidateSet& CandidateSet);
2772  void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
2773  SourceLocation OpLoc, ArrayRef<Expr *> Args,
2774  OverloadCandidateSet& CandidateSet,
2775  SourceRange OpRange = SourceRange());
2776  void AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args,
2777  OverloadCandidateSet& CandidateSet,
2778  bool IsAssignmentOperator = false,
2779  unsigned NumContextualBoolArguments = 0);
2780  void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
2781  SourceLocation OpLoc, ArrayRef<Expr *> Args,
2782  OverloadCandidateSet& CandidateSet);
2783  void AddArgumentDependentLookupCandidates(DeclarationName Name,
2784  SourceLocation Loc,
2785  ArrayRef<Expr *> Args,
2786  TemplateArgumentListInfo *ExplicitTemplateArgs,
2787  OverloadCandidateSet& CandidateSet,
2788  bool PartialOverloading = false);
2789 
2790  // Emit as a 'note' the specific overload candidate
2791  void NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn,
2792  QualType DestType = QualType(),
2793  bool TakingAddress = false);
2794 
2795  // Emit as a series of 'note's all template and non-templates identified by
2796  // the expression Expr
2797  void NoteAllOverloadCandidates(Expr *E, QualType DestType = QualType(),
2798  bool TakingAddress = false);
2799 
2800  /// Check the enable_if expressions on the given function. Returns the first
2801  /// failing attribute, or NULL if they were all successful.
2802  EnableIfAttr *CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
2803  bool MissingImplicitThis = false);
2804 
2805  /// Find the failed Boolean condition within a given Boolean
2806  /// constant expression, and describe it with a string.
2807  ///
2808  /// \param AllowTopLevelCond Whether to allow the result to be the
2809  /// complete top-level condition.
2810  std::pair<Expr *, std::string>
2811  findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond);
2812 
2813  /// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
2814  /// non-ArgDependent DiagnoseIfAttrs.
2815  ///
2816  /// Argument-dependent diagnose_if attributes should be checked each time a
2817  /// function is used as a direct callee of a function call.
2818  ///
2819  /// Returns true if any errors were emitted.
2820  bool diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
2821  const Expr *ThisArg,
2823  SourceLocation Loc);
2824 
2825  /// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
2826  /// ArgDependent DiagnoseIfAttrs.
2827  ///
2828  /// Argument-independent diagnose_if attributes should be checked on every use
2829  /// of a function.
2830  ///
2831  /// Returns true if any errors were emitted.
2832  bool diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND,
2833  SourceLocation Loc);
2834 
2835  /// Returns whether the given function's address can be taken or not,
2836  /// optionally emitting a diagnostic if the address can't be taken.
2837  ///
2838  /// Returns false if taking the address of the function is illegal.
2839  bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function,
2840  bool Complain = false,
2841  SourceLocation Loc = SourceLocation());
2842 
2843  // [PossiblyAFunctionType] --> [Return]
2844  // NonFunctionType --> NonFunctionType
2845  // R (A) --> R(A)
2846  // R (*)(A) --> R (A)
2847  // R (&)(A) --> R (A)
2848  // R (S::*)(A) --> R (A)
2849  QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);
2850 
2851  FunctionDecl *
2852  ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
2853  QualType TargetType,
2854  bool Complain,
2855  DeclAccessPair &Found,
2856  bool *pHadMultipleCandidates = nullptr);
2857 
2858  FunctionDecl *
2859  resolveAddressOfOnlyViableOverloadCandidate(Expr *E,
2860  DeclAccessPair &FoundResult);
2861 
2862  bool resolveAndFixAddressOfOnlyViableOverloadCandidate(
2863  ExprResult &SrcExpr, bool DoFunctionPointerConversion = false);
2864 
2865  FunctionDecl *
2866  ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
2867  bool Complain = false,
2868  DeclAccessPair *Found = nullptr);
2869 
2870  bool ResolveAndFixSingleFunctionTemplateSpecialization(
2871  ExprResult &SrcExpr,
2872  bool DoFunctionPointerConverion = false,
2873  bool Complain = false,
2874  SourceRange OpRangeForComplaining = SourceRange(),
2875  QualType DestTypeForComplaining = QualType(),
2876  unsigned DiagIDForComplaining = 0);
2877 
2878 
2879  Expr *FixOverloadedFunctionReference(Expr *E,
2880  DeclAccessPair FoundDecl,
2881  FunctionDecl *Fn);
2882  ExprResult FixOverloadedFunctionReference(ExprResult,
2883  DeclAccessPair FoundDecl,
2884  FunctionDecl *Fn);
2885 
2886  void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
2887  ArrayRef<Expr *> Args,
2888  OverloadCandidateSet &CandidateSet,
2889  bool PartialOverloading = false);
2890 
2891  // An enum used to represent the different possible results of building a
2892  // range-based for loop.
2896  FRS_DiagnosticIssued
2897  };
2898 
2899  ForRangeStatus BuildForRangeBeginEndCall(SourceLocation Loc,
2900  SourceLocation RangeLoc,
2901  const DeclarationNameInfo &NameInfo,
2902  LookupResult &MemberLookup,
2903  OverloadCandidateSet *CandidateSet,
2904  Expr *Range, ExprResult *CallExpr);
2905 
2906  ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
2907  UnresolvedLookupExpr *ULE,
2908  SourceLocation LParenLoc,
2909  MultiExprArg Args,
2910  SourceLocation RParenLoc,
2911  Expr *ExecConfig,
2912  bool AllowTypoCorrection=true,
2913  bool CalleesAddressIsTaken=false);
2914 
2915  bool buildOverloadedCallSet(Scope *S, Expr *Fn, UnresolvedLookupExpr *ULE,
2916  MultiExprArg Args, SourceLocation RParenLoc,
2917  OverloadCandidateSet *CandidateSet,
2918  ExprResult *Result);
2919 
2920  ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
2921  UnaryOperatorKind Opc,
2922  const UnresolvedSetImpl &Fns,
2923  Expr *input, bool RequiresADL = true);
2924 
2925  ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
2926  BinaryOperatorKind Opc,
2927  const UnresolvedSetImpl &Fns,
2928  Expr *LHS, Expr *RHS,
2929  bool RequiresADL = true);
2930 
2931  ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
2932  SourceLocation RLoc,
2933  Expr *Base,Expr *Idx);
2934 
2935  ExprResult
2936  BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
2937  SourceLocation LParenLoc,
2938  MultiExprArg Args,
2939  SourceLocation RParenLoc);
2940  ExprResult
2941  BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
2942  MultiExprArg Args,
2943  SourceLocation RParenLoc);
2944 
2945  ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
2946  SourceLocation OpLoc,
2947  bool *NoArrowOperatorFound = nullptr);
2948 
2949  /// CheckCallReturnType - Checks that a call expression's return type is
2950  /// complete. Returns true on failure. The location passed in is the location
2951  /// that best represents the call.
2952  bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
2953  CallExpr *CE, FunctionDecl *FD);
2954 
2955  /// Helpers for dealing with blocks and functions.
2956  bool CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
2957  bool CheckParameterNames);
2958  void CheckCXXDefaultArguments(FunctionDecl *FD);
2959  void CheckExtraCXXDefaultArguments(Declarator &D);
2960  Scope *getNonFieldDeclScope(Scope *S);
2961 
2962  /// \name Name lookup
2963  ///
2964  /// These routines provide name lookup that is used during semantic
2965  /// analysis to resolve the various kinds of names (identifiers,
2966  /// overloaded operator names, constructor names, etc.) into zero or
2967  /// more declarations within a particular scope. The major entry
2968  /// points are LookupName, which performs unqualified name lookup,
2969  /// and LookupQualifiedName, which performs qualified name lookup.
2970  ///
2971  /// All name lookup is performed based on some specific criteria,
2972  /// which specify what names will be visible to name lookup and how
2973  /// far name lookup should work. These criteria are important both
2974  /// for capturing language semantics (certain lookups will ignore
2975  /// certain names, for example) and for performance, since name
2976  /// lookup is often a bottleneck in the compilation of C++. Name
2977  /// lookup criteria is specified via the LookupCriteria enumeration.
2978  ///
2979  /// The results of name lookup can vary based on the kind of name
2980  /// lookup performed, the current language, and the translation
2981  /// unit. In C, for example, name lookup will either return nothing
2982  /// (no entity found) or a single declaration. In C++, name lookup
2983  /// can additionally refer to a set of overloaded functions or
2984  /// result in an ambiguity. All of the possible results of name
2985  /// lookup are captured by the LookupResult class, which provides
2986  /// the ability to distinguish among them.
2987  //@{
2988 
2989  /// @brief Describes the kind of name lookup to perform.
2991  /// Ordinary name lookup, which finds ordinary names (functions,
2992  /// variables, typedefs, etc.) in C and most kinds of names
2993  /// (functions, variables, members, types, etc.) in C++.
2994  LookupOrdinaryName = 0,
2995  /// Tag name lookup, which finds the names of enums, classes,
2996  /// structs, and unions.
2998  /// Label name lookup.
3000  /// Member name lookup, which finds the names of
3001  /// class/struct/union members.
3003  /// Look up of an operator name (e.g., operator+) for use with
3004  /// operator overloading. This lookup is similar to ordinary name
3005  /// lookup, but will ignore any declarations that are class members.
3007  /// Look up of a name that precedes the '::' scope resolution
3008  /// operator in C++. This lookup completely ignores operator, object,
3009  /// function, and enumerator names (C++ [basic.lookup.qual]p1).
3011  /// Look up a namespace name within a C++ using directive or
3012  /// namespace alias definition, ignoring non-namespace names (C++
3013  /// [basic.lookup.udir]p1).
3015  /// Look up all declarations in a scope with the given name,
3016  /// including resolved using declarations. This is appropriate
3017  /// for checking redeclarations for a using declaration.
3019  /// Look up an ordinary name that is going to be redeclared as a
3020  /// name with linkage. This lookup ignores any declarations that
3021  /// are outside of the current scope unless they have linkage. See
3022  /// C99 6.2.2p4-5 and C++ [basic.link]p6.
3024  /// Look up a friend of a local class. This lookup does not look
3025  /// outside the innermost non-class scope. See C++11 [class.friend]p11.
3027  /// Look up the name of an Objective-C protocol.
3029  /// Look up implicit 'self' parameter of an objective-c method.
3031  /// \brief Look up the name of an OpenMP user-defined reduction operation.
3033  /// \brief Look up any declaration with any name.
3034  LookupAnyName
3035  };
3036 
3037  /// \brief Specifies whether (or how) name lookup is being performed for a
3038  /// redeclaration (vs. a reference).
3040  /// \brief The lookup is a reference to this name that is not for the
3041  /// purpose of redeclaring the name.
3042  NotForRedeclaration = 0,
3043  /// \brief The lookup results will be used for redeclaration of a name,
3044  /// if an entity by that name already exists and is visible.
3046  /// \brief The lookup results will be used for redeclaration of a name
3047  /// with external linkage; non-visible lookup results with external linkage
3048  /// may also be found.
3049  ForExternalRedeclaration
3050  };
3051 
3053  // A declaration with an owning module for linkage can never link against
3054  // anything that is not visible. We don't need to check linkage here; if
3055  // the context has internal linkage, redeclaration lookup won't find things
3056  // from other TUs, and we can't safely compute linkage yet in general.
3057  if (cast<Decl>(CurContext)
3058  ->getOwningModuleForLinkage(/*IgnoreLinkage*/true))
3059  return ForVisibleRedeclaration;
3060  return ForExternalRedeclaration;
3061  }
3062 
3063  /// \brief The possible outcomes of name lookup for a literal operator.
3065  /// \brief The lookup resulted in an error.
3067  /// \brief The lookup found no match but no diagnostic was issued.
3069  /// \brief The lookup found a single 'cooked' literal operator, which
3070  /// expects a normal literal to be built and passed to it.
3072  /// \brief The lookup found a single 'raw' literal operator, which expects
3073  /// a string literal containing the spelling of the literal token.
3075  /// \brief The lookup found an overload set of literal operator templates,
3076  /// which expect the characters of the spelling of the literal token to be
3077  /// passed as a non-type template argument pack.
3079  /// \brief The lookup found an overload set of literal operator templates,
3080  /// which expect the character type and characters of the spelling of the
3081  /// string literal token to be passed as template arguments.
3082  LOLR_StringTemplate
3083  };
3084 
3085  SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D,
3087  bool ConstArg,
3088  bool VolatileArg,
3089  bool RValueThis,
3090  bool ConstThis,
3091  bool VolatileThis);
3092 
3093  typedef std::function<void(const TypoCorrection &)> TypoDiagnosticGenerator;
3094  typedef std::function<ExprResult(Sema &, TypoExpr *, TypoCorrection)>
3096 
3097 private:
3098  bool CppLookupName(LookupResult &R, Scope *S);
3099 
3100  struct TypoExprState {
3101  std::unique_ptr<TypoCorrectionConsumer> Consumer;
3102  TypoDiagnosticGenerator DiagHandler;
3103  TypoRecoveryCallback RecoveryHandler;
3104  TypoExprState();
3105  TypoExprState(TypoExprState &&other) noexcept;
3106  TypoExprState &operator=(TypoExprState &&other) noexcept;
3107  };
3108 
3109  /// \brief The set of unhandled TypoExprs and their associated state.
3110  llvm::MapVector<TypoExpr *, TypoExprState> DelayedTypos;
3111 
3112  /// \brief Creates a new TypoExpr AST node.
3113  TypoExpr *createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC,
3114  TypoDiagnosticGenerator TDG,
3115  TypoRecoveryCallback TRC);
3116 
3117  // \brief The set of known/encountered (unique, canonicalized) NamespaceDecls.
3118  //
3119  // The boolean value will be true to indicate that the namespace was loaded
3120  // from an AST/PCH file, or false otherwise.
3121  llvm::MapVector<NamespaceDecl*, bool> KnownNamespaces;
3122 
3123  /// \brief Whether we have already loaded known namespaces from an extenal
3124  /// source.
3125  bool LoadedExternalKnownNamespaces;
3126 
3127  /// \brief Helper for CorrectTypo and CorrectTypoDelayed used to create and
3128  /// populate a new TypoCorrectionConsumer. Returns nullptr if typo correction
3129  /// should be skipped entirely.
3130  std::unique_ptr<TypoCorrectionConsumer>
3131  makeTypoCorrectionConsumer(const DeclarationNameInfo &Typo,
3132  Sema::LookupNameKind LookupKind, Scope *S,
3133  CXXScopeSpec *SS,
3134  std::unique_ptr<CorrectionCandidateCallback> CCC,
3135  DeclContext *MemberContext, bool EnteringContext,
3136  const ObjCObjectPointerType *OPT,
3137  bool ErrorRecovery);
3138 
3139 public:
3140  const TypoExprState &getTypoExprState(TypoExpr *TE) const;
3141 
3142  /// \brief Clears the state of the given TypoExpr.
3143  void clearDelayedTypo(TypoExpr *TE);
3144 
3145  /// \brief Look up a name, looking for a single declaration. Return
3146  /// null if the results were absent, ambiguous, or overloaded.
3147  ///
3148  /// It is preferable to use the elaborated form and explicitly handle
3149  /// ambiguity and overloaded.
3150  NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
3151  SourceLocation Loc,
3152  LookupNameKind NameKind,
3153  RedeclarationKind Redecl
3154  = NotForRedeclaration);
3155  bool LookupName(LookupResult &R, Scope *S,
3156  bool AllowBuiltinCreation = false);
3157  bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
3158  bool InUnqualifiedLookup = false);
3159  bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
3160  CXXScopeSpec &SS);
3161  bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
3162  bool AllowBuiltinCreation = false,
3163  bool EnteringContext = false);
3164  ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
3165  RedeclarationKind Redecl
3166  = NotForRedeclaration);
3167  bool LookupInSuper(LookupResult &R, CXXRecordDecl *Class);
3168 
3169  void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
3170  QualType T1, QualType T2,
3171  UnresolvedSetImpl &Functions);
3172 
3173  LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
3174  SourceLocation GnuLabelLoc = SourceLocation());
3175 
3176  DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
3177  CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
3178  CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
3179  unsigned Quals);
3180  CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
3181  bool RValueThis, unsigned ThisQuals);
3182  CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class,
3183  unsigned Quals);
3184  CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, unsigned Quals,
3185  bool RValueThis, unsigned ThisQuals);
3186  CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);
3187 
3188  bool checkLiteralOperatorId(const CXXScopeSpec &SS, const UnqualifiedId &Id);
3189  LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
3190  ArrayRef<QualType> ArgTys,
3191  bool AllowRaw,
3192  bool AllowTemplate,
3193  bool AllowStringTemplate,
3194  bool DiagnoseMissing);
3195  bool isKnownName(StringRef name);
3196 
3197  void ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc,
3198  ArrayRef<Expr *> Args, ADLResult &Functions);
3199 
3200  void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
3201  VisibleDeclConsumer &Consumer,
3202  bool IncludeGlobalScope = true);
3204  VisibleDeclConsumer &Consumer,
3205  bool IncludeGlobalScope = true,
3206  bool IncludeDependentBases = false);
3207 
3209  CTK_NonError, // CorrectTypo used in a non error recovery situation.
3210  CTK_ErrorRecovery // CorrectTypo used in normal error recovery.
3211  };
3212 
3213  TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
3214  Sema::LookupNameKind LookupKind,
3215  Scope *S, CXXScopeSpec *SS,
3216  std::unique_ptr<CorrectionCandidateCallback> CCC,
3217  CorrectTypoKind Mode,
3218  DeclContext *MemberContext = nullptr,
3219  bool EnteringContext = false,
3220  const ObjCObjectPointerType *OPT = nullptr,
3221  bool RecordFailure = true);
3222 
3223  TypoExpr *CorrectTypoDelayed(const DeclarationNameInfo &Typo,
3224  Sema::LookupNameKind LookupKind, Scope *S,
3225  CXXScopeSpec *SS,
3226  std::unique_ptr<CorrectionCandidateCallback> CCC,
3227  TypoDiagnosticGenerator TDG,
3229  DeclContext *MemberContext = nullptr,
3230  bool EnteringContext = false,
3231  const ObjCObjectPointerType *OPT = nullptr);
3232 
3233  /// \brief Process any TypoExprs in the given Expr and its children,
3234  /// generating diagnostics as appropriate and returning a new Expr if there
3235  /// were typos that were all successfully corrected and ExprError if one or
3236  /// more typos could not be corrected.
3237  ///
3238  /// \param E The Expr to check for TypoExprs.
3239  ///
3240  /// \param InitDecl A VarDecl to avoid because the Expr being corrected is its
3241  /// initializer.
3242  ///
3243  /// \param Filter A function applied to a newly rebuilt Expr to determine if
3244  /// it is an acceptable/usable result from a single combination of typo
3245  /// corrections. As long as the filter returns ExprError, different
3246  /// combinations of corrections will be tried until all are exhausted.
3247  ExprResult
3248  CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl = nullptr,
3249  llvm::function_ref<ExprResult(Expr *)> Filter =
3250  [](Expr *E) -> ExprResult { return E; });
3251 
3252  ExprResult
3254  llvm::function_ref<ExprResult(Expr *)> Filter) {
3255  return CorrectDelayedTyposInExpr(E, nullptr, Filter);
3256  }
3257 
3258  ExprResult
3259  CorrectDelayedTyposInExpr(ExprResult ER, VarDecl *InitDecl = nullptr,
3260  llvm::function_ref<ExprResult(Expr *)> Filter =
3261  [](Expr *E) -> ExprResult { return E; }) {
3262  return ER.isInvalid() ? ER : CorrectDelayedTyposInExpr(ER.get(), Filter);
3263  }
3264 
3265  ExprResult
3267  llvm::function_ref<ExprResult(Expr *)> Filter) {
3268  return CorrectDelayedTyposInExpr(ER, nullptr, Filter);
3269  }
3270 
3271  void diagnoseTypo(const TypoCorrection &Correction,
3272  const PartialDiagnostic &TypoDiag,
3273  bool ErrorRecovery = true);
3274 
3275  void diagnoseTypo(const TypoCorrection &Correction,
3276  const PartialDiagnostic &TypoDiag,
3277  const PartialDiagnostic &PrevNote,
3278  bool ErrorRecovery = true);
3279 
3280  void MarkTypoCorrectedFunctionDefinition(const NamedDecl *F);
3281 
3282  void FindAssociatedClassesAndNamespaces(SourceLocation InstantiationLoc,
3283  ArrayRef<Expr *> Args,
3284  AssociatedNamespaceSet &AssociatedNamespaces,
3285  AssociatedClassSet &AssociatedClasses);
3286 
3287  void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
3288  bool ConsiderLinkage, bool AllowInlineNamespace);
3289 
3290  bool CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old);
3291 
3292  void DiagnoseAmbiguousLookup(LookupResult &Result);
3293  //@}
3294 
3295  ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
3296  SourceLocation IdLoc,
3297  bool TypoCorrection = false);
3298  NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
3299  Scope *S, bool ForRedeclaration,
3300  SourceLocation Loc);
3301  NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
3302  Scope *S);
3303  void AddKnownFunctionAttributes(FunctionDecl *FD);
3304 
3305  // More parsing and symbol table subroutines.
3306 
3307  void ProcessPragmaWeak(Scope *S, Decl *D);
3308  // Decl attributes - this routine is the top level dispatcher.
3309  void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD);
3310  // Helper for delayed processing of attributes.
3311  void ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList);
3312  void ProcessDeclAttributeList(Scope *S, Decl *D, const AttributeList *AL,
3313  bool IncludeCXX11Attributes = true);
3314  bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
3315  const AttributeList *AttrList);
3316 
3318 
3319  /// Determine if type T is a valid subject for a nonnull and similar
3320  /// attributes. By default, we look through references (the behavior used by
3321  /// nonnull), but if the second parameter is true, then we treat a reference
3322  /// type as valid.
3323  bool isValidPointerAttrType(QualType T, bool RefOkay = false);
3324 
3325  bool CheckRegparmAttr(const AttributeList &attr, unsigned &value);
3326  bool CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
3327  const FunctionDecl *FD = nullptr);
3328  bool CheckNoReturnAttr(const AttributeList &attr);
3329  bool CheckNoCallerSavedRegsAttr(const AttributeList &attr);
3330  bool checkStringLiteralArgumentAttr(const AttributeList &Attr,
3331  unsigned ArgNum, StringRef &Str,
3332  SourceLocation *ArgLocation = nullptr);
3333  bool checkSectionName(SourceLocation LiteralLoc, StringRef Str);
3334  bool checkTargetAttr(SourceLocation LiteralLoc, StringRef Str);
3335  bool checkMSInheritanceAttrOnDefinition(
3336  CXXRecordDecl *RD, SourceRange Range, bool BestCase,
3337  MSInheritanceAttr::Spelling SemanticSpelling);
3338 
3339  void CheckAlignasUnderalignment(Decl *D);
3340 
3341  /// Adjust the calling convention of a method to be the ABI default if it
3342  /// wasn't specified explicitly. This handles method types formed from
3343  /// function type typedefs and typename template arguments.
3344  void adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
3345  SourceLocation Loc);
3346 
3347  // Check if there is an explicit attribute, but only look through parens.
3348  // The intent is to look for an attribute on the current declarator, but not
3349  // one that came from a typedef.
3350  bool hasExplicitCallingConv(QualType &T);
3351 
3352  /// Get the outermost AttributedType node that sets a calling convention.
3353  /// Valid types should not have multiple attributes with different CCs.
3354  const AttributedType *getCallingConvAttributedType(QualType T) const;
3355 
3356  /// Check whether a nullability type specifier can be added to the given
3357  /// type.
3358  ///
3359  /// \param type The type to which the nullability specifier will be
3360  /// added. On success, this type will be updated appropriately.
3361  ///
3362  /// \param nullability The nullability specifier to add.
3363  ///
3364  /// \param nullabilityLoc The location of the nullability specifier.
3365  ///
3366  /// \param isContextSensitive Whether this nullability specifier was
3367  /// written as a context-sensitive keyword (in an Objective-C
3368  /// method) or an Objective-C property attribute, rather than as an
3369  /// underscored type specifier.
3370  ///
3371  /// \param allowArrayTypes Whether to accept nullability specifiers on an
3372  /// array type (e.g., because it will decay to a pointer).
3373  ///
3374  /// \returns true if nullability cannot be applied, false otherwise.
3375  bool checkNullabilityTypeSpecifier(QualType &type, NullabilityKind nullability,
3376  SourceLocation nullabilityLoc,
3377  bool isContextSensitive,
3378  bool allowArrayTypes);
3379 
3380  /// \brief Stmt attributes - this routine is the top level dispatcher.
3381  StmtResult ProcessStmtAttributes(Stmt *Stmt, AttributeList *Attrs,
3382  SourceRange Range);
3383 
3384  void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
3385  ObjCMethodDecl *MethodDecl,
3386  bool IsProtocolMethodDecl);
3387 
3388  void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
3389  ObjCMethodDecl *Overridden,
3390  bool IsProtocolMethodDecl);
3391 
3392  /// WarnExactTypedMethods - This routine issues a warning if method
3393  /// implementation declaration matches exactly that of its declaration.
3394  void WarnExactTypedMethods(ObjCMethodDecl *Method,
3395  ObjCMethodDecl *MethodDecl,
3396  bool IsProtocolMethodDecl);
3397 
3398  typedef llvm::SmallPtrSet<Selector, 8> SelectorSet;
3399 
3400  /// CheckImplementationIvars - This routine checks if the instance variables
3401  /// listed in the implelementation match those listed in the interface.
3402  void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
3403  ObjCIvarDecl **Fields, unsigned nIvars,
3404  SourceLocation Loc);
3405 
3406  /// ImplMethodsVsClassMethods - This is main routine to warn if any method
3407  /// remains unimplemented in the class or category \@implementation.
3408  void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
3409  ObjCContainerDecl* IDecl,
3410  bool IncompleteImpl = false);
3411 
3412  /// DiagnoseUnimplementedProperties - This routine warns on those properties
3413  /// which must be implemented by this implementation.
3414  void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
3415  ObjCContainerDecl *CDecl,
3416  bool SynthesizeProperties);
3417 
3418  /// Diagnose any null-resettable synthesized setters.
3419  void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl);
3420 
3421  /// DefaultSynthesizeProperties - This routine default synthesizes all
3422  /// properties which must be synthesized in the class's \@implementation.
3423  void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl,
3424  ObjCInterfaceDecl *IDecl,
3425  SourceLocation AtEnd);
3426  void DefaultSynthesizeProperties(Scope *S, Decl *D, SourceLocation AtEnd);
3427 
3428  /// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
3429  /// an ivar synthesized for 'Method' and 'Method' is a property accessor
3430  /// declared in class 'IFace'.
3431  bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace,
3432  ObjCMethodDecl *Method, ObjCIvarDecl *IV);
3433 
3434  /// DiagnoseUnusedBackingIvarInAccessor - Issue an 'unused' warning if ivar which
3435  /// backs the property is not used in the property's accessor.
3436  void DiagnoseUnusedBackingIvarInAccessor(Scope *S,
3437  const ObjCImplementationDecl *ImplD);
3438 
3439  /// GetIvarBackingPropertyAccessor - If method is a property setter/getter and
3440  /// it property has a backing ivar, returns this ivar; otherwise, returns NULL.
3441  /// It also returns ivar's property on success.
3442  ObjCIvarDecl *GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
3443  const ObjCPropertyDecl *&PDecl) const;
3444 
3445  /// Called by ActOnProperty to handle \@property declarations in
3446  /// class extensions.
3447  ObjCPropertyDecl *HandlePropertyInClassExtension(Scope *S,
3448  SourceLocation AtLoc,
3449  SourceLocation LParenLoc,
3450  FieldDeclarator &FD,
3451  Selector GetterSel,
3452  SourceLocation GetterNameLoc,
3453  Selector SetterSel,
3454  SourceLocation SetterNameLoc,
3455  const bool isReadWrite,
3456  unsigned &Attributes,
3457  const unsigned AttributesAsWritten,
3458  QualType T,
3459  TypeSourceInfo *TSI,
3460  tok::ObjCKeywordKind MethodImplKind);
3461 
3462  /// Called by ActOnProperty and HandlePropertyInClassExtension to
3463  /// handle creating the ObjcPropertyDecl for a category or \@interface.
3464  ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
3465  ObjCContainerDecl *CDecl,
3466  SourceLocation AtLoc,
3467  SourceLocation LParenLoc,
3468  FieldDeclarator &FD,
3469  Selector GetterSel,
3470  SourceLocation GetterNameLoc,
3471  Selector SetterSel,
3472  SourceLocation SetterNameLoc,
3473  const bool isReadWrite,
3474  const unsigned Attributes,
3475  const unsigned AttributesAsWritten,
3476  QualType T,
3477  TypeSourceInfo *TSI,
3478  tok::ObjCKeywordKind MethodImplKind,
3479  DeclContext *lexicalDC = nullptr);
3480 
3481  /// AtomicPropertySetterGetterRules - This routine enforces the rule (via
3482  /// warning) when atomic property has one but not the other user-declared
3483  /// setter or getter.
3484  void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
3485  ObjCInterfaceDecl* IDecl);
3486 
3487  void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);
3488 
3489  void DiagnoseMissingDesignatedInitOverrides(
3490  const ObjCImplementationDecl *ImplD,
3491  const ObjCInterfaceDecl *IFD);
3492 
3493  void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);
3494 
3497  MMS_strict
3498  };
3499 
3500  /// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
3501  /// true, or false, accordingly.
3502  bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
3503  const ObjCMethodDecl *PrevMethod,
3504  MethodMatchStrategy strategy = MMS_strict);
3505 
3506  /// MatchAllMethodDeclarations - Check methods declaraed in interface or
3507  /// or protocol against those declared in their implementations.
3508  void MatchAllMethodDeclarations(const SelectorSet &InsMap,
3509  const SelectorSet &ClsMap,
3510  SelectorSet &InsMapSeen,
3511  SelectorSet &ClsMapSeen,
3512  ObjCImplDecl* IMPDecl,
3513  ObjCContainerDecl* IDecl,
3514  bool &IncompleteImpl,
3515  bool ImmediateClass,
3516  bool WarnCategoryMethodImpl=false);
3517 
3518  /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
3519  /// category matches with those implemented in its primary class and
3520  /// warns each time an exact match is found.
3521  void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);
3522 
3523  /// \brief Add the given method to the list of globally-known methods.
3524  void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);
3525 
3526 private:
3527  /// AddMethodToGlobalPool - Add an instance or factory method to the global
3528  /// pool. See descriptoin of AddInstanceMethodToGlobalPool.
3529  void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);
3530 
3531  /// LookupMethodInGlobalPool - Returns the instance or factory method and
3532  /// optionally warns if there are multiple signatures.
3533  ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
3534  bool receiverIdOrClass,
3535  bool instance);
3536 
3537 public:
3538  /// \brief - Returns instance or factory methods in global method pool for
3539  /// given selector. It checks the desired kind first, if none is found, and
3540  /// parameter checkTheOther is set, it then checks the other kind. If no such
3541  /// method or only one method is found, function returns false; otherwise, it
3542  /// returns true.
3543  bool
3544  CollectMultipleMethodsInGlobalPool(Selector Sel,
3546  bool InstanceFirst, bool CheckTheOther,
3547  const ObjCObjectType *TypeBound = nullptr);
3548 
3549  bool
3550  AreMultipleMethodsInGlobalPool(Selector Sel, ObjCMethodDecl *BestMethod,
3551  SourceRange R, bool receiverIdOrClass,
3553 
3554  void
3555  DiagnoseMultipleMethodInGlobalPool(SmallVectorImpl<ObjCMethodDecl*> &Methods,
3556  Selector Sel, SourceRange R,
3557  bool receiverIdOrClass);
3558 
3559 private:
3560  /// \brief - Returns a selector which best matches given argument list or
3561  /// nullptr if none could be found
3562  ObjCMethodDecl *SelectBestMethod(Selector Sel, MultiExprArg Args,
3563  bool IsInstance,
3565 
3566 
3567  /// \brief Record the typo correction failure and return an empty correction.
3568  TypoCorrection FailedCorrection(IdentifierInfo *Typo, SourceLocation TypoLoc,
3569  bool RecordFailure = true) {
3570  if (RecordFailure)
3571  TypoCorrectionFailures[Typo].insert(TypoLoc);
3572  return TypoCorrection();
3573  }
3574 
3575 public:
3576  /// AddInstanceMethodToGlobalPool - All instance methods in a translation
3577  /// unit are added to a global pool. This allows us to efficiently associate
3578  /// a selector with a method declaraation for purposes of typechecking
3579  /// messages sent to "id" (where the class of the object is unknown).
3580  void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
3581  AddMethodToGlobalPool(Method, impl, /*instance*/true);
3582  }
3583 
3584  /// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
3585  void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
3586  AddMethodToGlobalPool(Method, impl, /*instance*/false);
3587  }
3588 
3589  /// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
3590  /// pool.
3591  void AddAnyMethodToGlobalPool(Decl *D);
3592 
3593  /// LookupInstanceMethodInGlobalPool - Returns the method and warns if
3594  /// there are multiple signatures.
3596  bool receiverIdOrClass=false) {
3597  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
3598  /*instance*/true);
3599  }
3600 
3601  /// LookupFactoryMethodInGlobalPool - Returns the method and warns if
3602  /// there are multiple signatures.
3604  bool receiverIdOrClass=false) {
3605  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
3606  /*instance*/false);
3607  }
3608 
3609  const ObjCMethodDecl *SelectorsForTypoCorrection(Selector Sel,
3610  QualType ObjectType=QualType());
3611  /// LookupImplementedMethodInGlobalPool - Returns the method which has an
3612  /// implementation.
3613  ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);
3614 
3615  /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
3616  /// initialization.
3617  void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
3619 
3620  //===--------------------------------------------------------------------===//
3621  // Statement Parsing Callbacks: SemaStmt.cpp.
3622 public:
3623  class FullExprArg {
3624  public:
3625  FullExprArg() : E(nullptr) { }
3626  FullExprArg(Sema &actions) : E(nullptr) { }
3627 
3629  return E;
3630  }
3631 
3632  Expr *get() const { return E; }
3633 
3635  return E;
3636  }
3637 
3638  private:
3639  // FIXME: No need to make the entire Sema class a friend when it's just
3640  // Sema::MakeFullExpr that needs access to the constructor below.
3641  friend class Sema;
3642 
3643  explicit FullExprArg(Expr *expr) : E(expr) {}
3644 
3645  Expr *E;
3646  };
3647 
3649  return MakeFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation());
3650  }
3652  return FullExprArg(ActOnFinishFullExpr(Arg, CC).get());
3653  }
3655  ExprResult FE =
3656  ActOnFinishFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation(),
3657  /*DiscardedValue*/ true);
3658  return FullExprArg(FE.get());
3659  }
3660 
3661  StmtResult ActOnExprStmt(ExprResult Arg);
3662  StmtResult ActOnExprStmtError();
3663 
3664  StmtResult ActOnNullStmt(SourceLocation SemiLoc,
3665  bool HasLeadingEmptyMacro = false);
3666 
3667  void ActOnStartOfCompoundStmt();
3668  void ActOnFinishOfCompoundStmt();
3669  StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
3670  ArrayRef<Stmt *> Elts, bool isStmtExpr);
3671 
3672  /// \brief A RAII object to enter scope of a compound statement.
3674  public:
3677  }
3678 
3680  S.ActOnFinishOfCompoundStmt();
3681  }
3682 
3683  private:
3684  Sema &S;
3685  };
3686 
3687  /// An RAII helper that pops function a function scope on exit.
3690  bool Active;
3691  FunctionScopeRAII(Sema &S) : S(S), Active(true) {}
3693  if (Active)
3695  }
3696  void disable() { Active = false; }
3697  };
3698 
3699  StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
3700  SourceLocation StartLoc,
3701  SourceLocation EndLoc);
3702  void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
3703  StmtResult ActOnForEachLValueExpr(Expr *E);
3704  StmtResult ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
3705  SourceLocation DotDotDotLoc, Expr *RHSVal,
3707  void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);
3708 
3709  StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
3710  SourceLocation ColonLoc,
3711  Stmt *SubStmt, Scope *CurScope);
3712  StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
3713  SourceLocation ColonLoc, Stmt *SubStmt);
3714 
3715  StmtResult ActOnAttributedStmt(SourceLocation AttrLoc,
3716  ArrayRef<const Attr*> Attrs,
3717  Stmt *SubStmt);
3718 
3719  class ConditionResult;
3720  StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr,
3721  Stmt *InitStmt,
3722  ConditionResult Cond, Stmt *ThenVal,
3723  SourceLocation ElseLoc, Stmt *ElseVal);
3724  StmtResult BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
3725  Stmt *InitStmt,
3726  ConditionResult Cond, Stmt *ThenVal,
3727  SourceLocation ElseLoc, Stmt *ElseVal);
3728  StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
3729  Stmt *InitStmt,
3730  ConditionResult Cond);
3731  StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
3732  Stmt *Switch, Stmt *Body);
3733  StmtResult ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
3734  Stmt *Body);
3735  StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
3736  SourceLocation WhileLoc, SourceLocation CondLParen,
3737  Expr *Cond, SourceLocation CondRParen);
3738 
3739  StmtResult ActOnForStmt(SourceLocation ForLoc,
3740  SourceLocation LParenLoc,
3741  Stmt *First,
3742  ConditionResult Second,
3743  FullExprArg Third,
3744  SourceLocation RParenLoc,
3745  Stmt *Body);
3746  ExprResult CheckObjCForCollectionOperand(SourceLocation forLoc,
3747  Expr *collection);
3748  StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
3749  Stmt *First, Expr *collection,
3750  SourceLocation RParenLoc);
3751  StmtResult FinishObjCForCollectionStmt(Stmt *ForCollection, Stmt *Body);
3752 
3754  /// Initial building of a for-range statement.
3756  /// Instantiation or recovery rebuild of a for-range statement. Don't
3757  /// attempt any typo-correction.
3759  /// Determining whether a for-range statement could be built. Avoid any
3760  /// unnecessary or irreversible actions.
3761  BFRK_Check
3762  };
3763 
3764  StmtResult ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
3765  SourceLocation CoawaitLoc,
3766  Stmt *LoopVar,
3767  SourceLocation ColonLoc, Expr *Collection,
3768  SourceLocation RParenLoc,
3770  StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
3771  SourceLocation CoawaitLoc,
3772  SourceLocation ColonLoc,
3773  Stmt *RangeDecl, Stmt *Begin, Stmt *End,
3774  Expr *Cond, Expr *Inc,
3775  Stmt *LoopVarDecl,
3776  SourceLocation RParenLoc,
3778  StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);
3779 
3780  StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
3781  SourceLocation LabelLoc,
3782  LabelDecl *TheDecl);
3783  StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
3784  SourceLocation StarLoc,
3785  Expr *DestExp);
3786  StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
3787  StmtResult ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope);
3788 
3789  void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
3790  CapturedRegionKind Kind, unsigned NumParams);
3791  typedef std::pair<StringRef, QualType> CapturedParamNameType;
3792  void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
3795  StmtResult ActOnCapturedRegionEnd(Stmt *S);
3796  void ActOnCapturedRegionError();
3797  RecordDecl *CreateCapturedStmtRecordDecl(CapturedDecl *&CD,
3798  SourceLocation Loc,
3799  unsigned NumParams);
3800  VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
3801  bool AllowParamOrMoveConstructible);
3802  bool isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
3803  bool AllowParamOrMoveConstructible);
3804 
3805  StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
3806  Scope *CurScope);
3807  StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
3808  StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
3809 
3810  StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
3811  bool IsVolatile, unsigned NumOutputs,
3812  unsigned NumInputs, IdentifierInfo **Names,
3813  MultiExprArg Constraints, MultiExprArg Exprs,
3814  Expr *AsmString, MultiExprArg Clobbers,
3815  SourceLocation RParenLoc);
3816 
3817  void FillInlineAsmIdentifierInfo(Expr *Res,
3818  llvm::InlineAsmIdentifierInfo &Info);
3819  ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS,
3820  SourceLocation TemplateKWLoc,
3821  UnqualifiedId &Id,
3822  bool IsUnevaluatedContext);
3823  bool LookupInlineAsmField(StringRef Base, StringRef Member,
3824  unsigned &Offset, SourceLocation AsmLoc);
3825  ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member,
3826  SourceLocation AsmLoc);
3827  StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
3828  ArrayRef<Token> AsmToks,
3829  StringRef AsmString,
3830  unsigned NumOutputs, unsigned NumInputs,
3831  ArrayRef<StringRef> Constraints,
3832  ArrayRef<StringRef> Clobbers,
3833  ArrayRef<Expr*> Exprs,
3834  SourceLocation EndLoc);
3835  LabelDecl *GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
3836  SourceLocation Location,
3837  bool AlwaysCreate);
3838 
3839  VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
3840  SourceLocation StartLoc,
3841  SourceLocation IdLoc, IdentifierInfo *Id,
3842  bool Invalid = false);
3843 
3844  Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);
3845 
3846  StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
3847  Decl *Parm, Stmt *Body);
3848 
3849  StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);
3850 
3851  StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
3852  MultiStmtArg Catch, Stmt *Finally);
3853 
3854  StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
3855  StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
3856  Scope *CurScope);
3857  ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
3858  Expr *operand);
3859  StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
3860  Expr *SynchExpr,
3861  Stmt *SynchBody);
3862 
3863  StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);
3864 
3865  VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
3866  SourceLocation StartLoc,
3867  SourceLocation IdLoc,
3868  IdentifierInfo *Id);
3869 
3870  Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);
3871 
3872  StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
3873  Decl *ExDecl, Stmt *HandlerBlock);
3874  StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
3875  ArrayRef<Stmt *> Handlers);
3876 
3877  StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
3878  SourceLocation TryLoc, Stmt *TryBlock,
3879  Stmt *Handler);
3880  StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
3881  Expr *FilterExpr,
3882  Stmt *Block);
3883  void ActOnStartSEHFinallyBlock();
3884  void ActOnAbortSEHFinallyBlock();
3885  StmtResult ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block);
3886  StmtResult ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope);
3887 
3888  void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);
3889 
3890  bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;
3891 
3892  /// \brief If it's a file scoped decl that must warn if not used, keep track
3893  /// of it.
3894  void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);
3895 
3896  /// DiagnoseUnusedExprResult - If the statement passed in is an expression
3897  /// whose result is unused, warn.
3898  void DiagnoseUnusedExprResult(const Stmt *S);
3899  void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
3900  void DiagnoseUnusedDecl(const NamedDecl *ND);
3901 
3902  /// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
3903  /// statement as a \p Body, and it is located on the same line.
3904  ///
3905  /// This helps prevent bugs due to typos, such as:
3906  /// if (condition);
3907  /// do_stuff();
3908  void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
3909  const Stmt *Body,
3910  unsigned DiagID);
3911 
3912  /// Warn if a for/while loop statement \p S, which is followed by
3913  /// \p PossibleBody, has a suspicious null statement as a body.
3914  void DiagnoseEmptyLoopBody(const Stmt *S,
3915  const Stmt *PossibleBody);
3916 
3917  /// Warn if a value is moved to itself.
3918  void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
3919  SourceLocation OpLoc);
3920 
3921  /// \brief Warn if we're implicitly casting from a _Nullable pointer type to a
3922  /// _Nonnull one.
3923  void diagnoseNullableToNonnullConversion(QualType DstType, QualType SrcType,
3924  SourceLocation Loc);
3925 
3926  /// Warn when implicitly casting 0 to nullptr.
3927  void diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E);
3928 
3930  return DelayedDiagnostics.push(pool);
3931  }
3932  void PopParsingDeclaration(ParsingDeclState state, Decl *decl);
3933 
3934  typedef ProcessingContextState ParsingClassState;
3935  ParsingClassState PushParsingClass() {
3937  }
3938  void PopParsingClass(ParsingClassState state) {
3940  }
3941 
3942  void redelayDiagnostics(sema::DelayedDiagnosticPool &pool);
3943 
3944  void DiagnoseAvailabilityOfDecl(NamedDecl *D, SourceLocation Loc,
3945  const ObjCInterfaceDecl *UnknownObjCClass,
3946  bool ObjCPropertyAccess,
3947  bool AvoidPartialAvailabilityChecks = false);
3948 
3949  bool makeUnavailableInSystemHeader(SourceLocation loc,
3950  UnavailableAttr::ImplicitReason reason);
3951 
3952  /// \brief Issue any -Wunguarded-availability warnings in \c FD
3953  void DiagnoseUnguardedAvailabilityViolations(Decl *FD);
3954 
3955  //===--------------------------------------------------------------------===//
3956  // Expression Parsing Callbacks: SemaExpr.cpp.
3957 
3958  bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid);
3959  bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
3960  const ObjCInterfaceDecl *UnknownObjCClass = nullptr,
3961  bool ObjCPropertyAccess = false,
3962  bool AvoidPartialAvailabilityChecks = false);
3963  void NoteDeletedFunction(FunctionDecl *FD);
3964  void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD);
3965  std::string getDeletedOrUnavailableSuffix(const FunctionDecl *FD);
3966  bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
3967  ObjCMethodDecl *Getter,
3968  SourceLocation Loc);
3969  void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
3970  ArrayRef<Expr *> Args);
3971 
3972  void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
3973  Decl *LambdaContextDecl = nullptr,
3974  bool IsDecltype = false);
3975  enum ReuseLambdaContextDecl_t { ReuseLambdaContextDecl };
3976  void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
3978  bool IsDecltype = false);
3979  void PopExpressionEvaluationContext();
3980 
3981  void DiscardCleanupsInEvaluationContext();
3982 
3983  ExprResult TransformToPotentiallyEvaluated(Expr *E);
3984  ExprResult HandleExprEvaluationContextForTypeof(Expr *E);
3985 
3986  ExprResult ActOnConstantExpression(ExprResult Res);
3987 
3988  // Functions for marking a declaration referenced. These functions also
3989  // contain the relevant logic for marking if a reference to a function or
3990  // variable is an odr-use (in the C++11 sense). There are separate variants
3991  // for expressions referring to a decl; these exist because odr-use marking
3992  // needs to be delayed for some constant variables when we build one of the
3993  // named expressions.
3994  //
3995  // MightBeOdrUse indicates whether the use could possibly be an odr-use, and
3996  // should usually be true. This only needs to be set to false if the lack of
3997  // odr-use cannot be determined from the current context (for instance,
3998  // because the name denotes a virtual function and was written without an
3999  // explicit nested-name-specifier).
4000  void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse);
4001  void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
4002  bool MightBeOdrUse = true);
4003  void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
4004  void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base = nullptr);
4005  void MarkMemberReferenced(MemberExpr *E);
4006 
4007  void UpdateMarkingForLValueToRValue(Expr *E);
4008  void CleanupVarDeclMarking();
4009 
4011  TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
4012  };
4013 
4014  /// \brief Try to capture the given variable.
4015  ///
4016  /// \param Var The variable to capture.
4017  ///
4018  /// \param Loc The location at which the capture occurs.
4019  ///
4020  /// \param Kind The kind of capture, which may be implicit (for either a
4021  /// block or a lambda), or explicit by-value or by-reference (for a lambda).
4022  ///
4023  /// \param EllipsisLoc The location of the ellipsis, if one is provided in
4024  /// an explicit lambda capture.
4025  ///
4026  /// \param BuildAndDiagnose Whether we are actually supposed to add the
4027  /// captures or diagnose errors. If false, this routine merely check whether
4028  /// the capture can occur without performing the capture itself or complaining
4029  /// if the variable cannot be captured.
4030  ///
4031  /// \param CaptureType Will be set to the type of the field used to capture
4032  /// this variable in the innermost block or lambda. Only valid when the
4033  /// variable can be captured.
4034  ///
4035  /// \param DeclRefType Will be set to the type of a reference to the capture
4036  /// from within the current scope. Only valid when the variable can be
4037  /// captured.
4038  ///
4039  /// \param FunctionScopeIndexToStopAt If non-null, it points to the index
4040  /// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
4041  /// This is useful when enclosing lambdas must speculatively capture
4042  /// variables that may or may not be used in certain specializations of
4043  /// a nested generic lambda.
4044  ///
4045  /// \returns true if an error occurred (i.e., the variable cannot be
4046  /// captured) and false if the capture succeeded.
4047  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
4048  SourceLocation EllipsisLoc, bool BuildAndDiagnose,
4049  QualType &CaptureType,
4050  QualType &DeclRefType,
4051  const unsigned *const FunctionScopeIndexToStopAt);
4052 
4053  /// \brief Try to capture the given variable.
4054  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
4055  TryCaptureKind Kind = TryCapture_Implicit,
4056  SourceLocation EllipsisLoc = SourceLocation());
4057 
4058  /// \brief Checks if the variable must be captured.
4059  bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);
4060 
4061  /// \brief Given a variable, determine the type that a reference to that
4062  /// variable will have in the given scope.
4063  QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);
4064 
4065  /// Mark all of the declarations referenced within a particular AST node as
4066  /// referenced. Used when template instantiation instantiates a non-dependent
4067  /// type -- entities referenced by the type are now referenced.
4068  void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
4069  void MarkDeclarationsReferencedInExpr(Expr *E,
4070  bool SkipLocalVariables = false);
4071 
4072  /// \brief Try to recover by turning the given expression into a
4073  /// call. Returns true if recovery was attempted or an error was
4074  /// emitted; this may also leave the ExprResult invalid.
4075  bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
4076  bool ForceComplain = false,
4077  bool (*IsPlausibleResult)(QualType) = nullptr);
4078 
4079  /// \brief Figure out if an expression could be turned into a call.
4080  bool tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
4081  UnresolvedSetImpl &NonTemplateOverloads);
4082 
4083  /// \brief Conditionally issue a diagnostic based on the current
4084  /// evaluation context.
4085  ///
4086  /// \param Statement If Statement is non-null, delay reporting the
4087  /// diagnostic until the function body is parsed, and then do a basic
4088  /// reachability analysis to determine if the statement is reachable.
4089  /// If it is unreachable, the diagnostic will not be emitted.
4090  bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
4091  const PartialDiagnostic &PD);
4092 
4093  // Primary Expressions.
4094  SourceRange getExprRange(Expr *E) const;
4095 
4096  ExprResult ActOnIdExpression(
4097  Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
4098  UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand,
4099  std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr,
4100  bool IsInlineAsmIdentifier = false, Token *KeywordReplacement = nullptr);
4101 
4102  void DecomposeUnqualifiedId(const UnqualifiedId &Id,
4103  TemplateArgumentListInfo &Buffer,
4104  DeclarationNameInfo &NameInfo,
4105  const TemplateArgumentListInfo *&TemplateArgs);
4106 
4107  bool
4108  DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
4109  std::unique_ptr<CorrectionCandidateCallback> CCC,
4110  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
4111  ArrayRef<Expr *> Args = None, TypoExpr **Out = nullptr);
4112 
4113  ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
4114  IdentifierInfo *II,
4115  bool AllowBuiltinCreation=false);
4116 
4117  ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
4118  SourceLocation TemplateKWLoc,
4119  const DeclarationNameInfo &NameInfo,
4120  bool isAddressOfOperand,
4121  const TemplateArgumentListInfo *TemplateArgs);
4122 
4123  ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
4124  ExprValueKind VK,
4125  SourceLocation Loc,
4126  const CXXScopeSpec *SS = nullptr);
4127  ExprResult
4128  BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
4129  const DeclarationNameInfo &NameInfo,
4130  const CXXScopeSpec *SS = nullptr,
4131  NamedDecl *FoundD = nullptr,
4132  const TemplateArgumentListInfo *TemplateArgs = nullptr);
4133  ExprResult
4134  BuildAnonymousStructUnionMemberReference(
4135  const CXXScopeSpec &SS,
4136  SourceLocation nameLoc,
4137  IndirectFieldDecl *indirectField,
4138  DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_none),
4139  Expr *baseObjectExpr = nullptr,
4140  SourceLocation opLoc = SourceLocation());
4141 
4142  ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
4143  SourceLocation TemplateKWLoc,
4144  LookupResult &R,
4145  const TemplateArgumentListInfo *TemplateArgs,
4146  const Scope *S);
4147  ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
4148  SourceLocation TemplateKWLoc,
4149  LookupResult &R,
4150  const TemplateArgumentListInfo *TemplateArgs,
4151  bool IsDefiniteInstance,
4152  const Scope *S);
4153  bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
4154  const LookupResult &R,
4155  bool HasTrailingLParen);
4156 
4157  ExprResult
4158  BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
4159  const DeclarationNameInfo &NameInfo,
4160  bool IsAddressOfOperand, const Scope *S,
4161  TypeSourceInfo **RecoveryTSI = nullptr);
4162 
4163  ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
4164  SourceLocation TemplateKWLoc,
4165  const DeclarationNameInfo &NameInfo,
4166  const TemplateArgumentListInfo *TemplateArgs);
4167 
4168  ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
4169  LookupResult &R,
4170  bool NeedsADL,
4171  bool AcceptInvalidDecl = false);
4172  ExprResult BuildDeclarationNameExpr(
4173  const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
4174  NamedDecl *FoundD = nullptr,
4175  const TemplateArgumentListInfo *TemplateArgs = nullptr,
4176  bool AcceptInvalidDecl = false);
4177 
4178  ExprResult BuildLiteralOperatorCall(LookupResult &R,
4179  DeclarationNameInfo &SuffixInfo,
4180  ArrayRef<Expr *> Args,
4181  SourceLocation LitEndLoc,
4182  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr);
4183 
4184  ExprResult BuildPredefinedExpr(SourceLocation Loc,
4186  ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
4187  ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);
4188 
4189  bool CheckLoopHintExpr(Expr *E, SourceLocation Loc);
4190 
4191  ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = nullptr);
4192  ExprResult ActOnCharacterConstant(const Token &Tok,
4193  Scope *UDLScope = nullptr);
4194  ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
4195  ExprResult ActOnParenListExpr(SourceLocation L,
4196  SourceLocation R,
4197  MultiExprArg Val);
4198 
4199  /// ActOnStringLiteral - The specified tokens were lexed as pasted string
4200  /// fragments (e.g. "foo" "bar" L"baz").
4201  ExprResult ActOnStringLiteral(ArrayRef<Token> StringToks,
4202  Scope *UDLScope = nullptr);
4203 
4204  ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
4205  SourceLocation DefaultLoc,
4206  SourceLocation RParenLoc,
4207  Expr *ControllingExpr,
4208  ArrayRef<ParsedType> ArgTypes,
4209  ArrayRef<Expr *> ArgExprs);
4210  ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
4211  SourceLocation DefaultLoc,
4212  SourceLocation RParenLoc,
4213  Expr *ControllingExpr,
4215  ArrayRef<Expr *> Exprs);
4216 
4217  // Binary/Unary Operators. 'Tok' is the token for the operator.
4218  ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
4219  Expr *InputExpr);
4220  ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
4221  UnaryOperatorKind Opc, Expr *Input);
4222  ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
4223  tok::TokenKind Op, Expr *Input);
4224 
4225  QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc);
4226 
4227  ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
4228  SourceLocation OpLoc,
4229  UnaryExprOrTypeTrait ExprKind,
4230  SourceRange R);
4231  ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
4232  UnaryExprOrTypeTrait ExprKind);
4233  ExprResult
4234  ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
4235  UnaryExprOrTypeTrait ExprKind,
4236  bool IsType, void *TyOrEx,
4237  SourceRange ArgRange);
4238 
4239  ExprResult CheckPlaceholderExpr(Expr *E);
4240  bool CheckVecStepExpr(Expr *E);
4241 
4242  bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
4243  bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
4244  SourceRange ExprRange,
4245  UnaryExprOrTypeTrait ExprKind);
4246  ExprResult ActOnSizeofParameterPackExpr(Scope *S,
4247  SourceLocation OpLoc,
4248  IdentifierInfo &Name,
4249  SourceLocation NameLoc,
4250  SourceLocation RParenLoc);
4251  ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
4252  tok::TokenKind Kind, Expr *Input);
4253 
4254  ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
4255  Expr *Idx, SourceLocation RLoc);
4256  ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
4257  Expr *Idx, SourceLocation RLoc);
4258  ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
4259  Expr *LowerBound, SourceLocation ColonLoc,
4260  Expr *Length, SourceLocation RBLoc);
4261 
4262  // This struct is for use by ActOnMemberAccess to allow
4263  // BuildMemberReferenceExpr to be able to reinvoke ActOnMemberAccess after
4264  // changing the access operator from a '.' to a '->' (to see if that is the
4265  // change needed to fix an error about an unknown member, e.g. when the class
4266  // defines a custom operator->).
4268  Scope *S;
4271  };
4272 
4273  ExprResult BuildMemberReferenceExpr(
4274  Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow,
4275  CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
4276  NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo,
4277  const TemplateArgumentListInfo *TemplateArgs,
4278  const Scope *S,
4279  ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);
4280 
4281  ExprResult
4282  BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc,
4283  bool IsArrow, const CXXScopeSpec &SS,
4284  SourceLocation TemplateKWLoc,
4285  NamedDecl *FirstQualifierInScope, LookupResult &R,
4286  const TemplateArgumentListInfo *TemplateArgs,
4287  const Scope *S,
4288  bool SuppressQualifierCheck = false,
4289  ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);
4290 
4291  ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
4292  SourceLocation OpLoc,
4293  const CXXScopeSpec &SS, FieldDecl *Field,
4294  DeclAccessPair FoundDecl,
4295  const DeclarationNameInfo &MemberNameInfo);
4296 
4297  ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);
4298 
4299  bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
4300  const CXXScopeSpec &SS,
4301  const LookupResult &R);
4302 
4303  ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
4304  bool IsArrow, SourceLocation OpLoc,
4305  const CXXScopeSpec &SS,
4306  SourceLocation TemplateKWLoc,
4307  NamedDecl *FirstQualifierInScope,
4308  const DeclarationNameInfo &NameInfo,
4309  const TemplateArgumentListInfo *TemplateArgs);
4310 
4311  ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
4312  SourceLocation OpLoc,
4313  tok::TokenKind OpKind,
4314  CXXScopeSpec &SS,
4315  SourceLocation TemplateKWLoc,
4316  UnqualifiedId &Member,
4317  Decl *ObjCImpDecl);
4318 
4319  void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
4320  bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
4321  FunctionDecl *FDecl,
4322  const FunctionProtoType *Proto,
4323  ArrayRef<Expr *> Args,
4324  SourceLocation RParenLoc,
4325  bool ExecConfig = false);
4326  void CheckStaticArrayArgument(SourceLocation CallLoc,
4327  ParmVarDecl *Param,
4328  const Expr *ArgExpr);
4329 
4330  /// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
4331  /// This provides the location of the left/right parens and a list of comma
4332  /// locations.
4333  ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
4334  MultiExprArg ArgExprs, SourceLocation RParenLoc,
4335  Expr *ExecConfig = nullptr,
4336  bool IsExecConfig = false);
4337  ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
4338  SourceLocation LParenLoc,
4339  ArrayRef<Expr *> Arg,
4340  SourceLocation RParenLoc,
4341  Expr *Config = nullptr,
4342  bool IsExecConfig = false);
4343 
4344  ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
4345  MultiExprArg ExecConfig,
4346  SourceLocation GGGLoc);
4347 
4348  ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4349  Declarator &D, ParsedType &Ty,
4350  SourceLocation RParenLoc, Expr *CastExpr);
4351  ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
4352  TypeSourceInfo *Ty,
4353  SourceLocation RParenLoc,
4354  Expr *Op);
4355  CastKind PrepareScalarCast(ExprResult &src, QualType destType);
4356 
4357  /// \brief Build an altivec or OpenCL literal.
4358  ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
4359  SourceLocation RParenLoc, Expr *E,
4360  TypeSourceInfo *TInfo);
4361 
4362  ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);
4363 
4364  ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
4365  ParsedType Ty,
4366  SourceLocation RParenLoc,
4367  Expr *InitExpr);
4368 
4369  ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
4370  TypeSourceInfo *TInfo,
4371  SourceLocation RParenLoc,
4372  Expr *LiteralExpr);
4373 
4374  ExprResult ActOnInitList(SourceLocation LBraceLoc,
4375  MultiExprArg InitArgList,
4376  SourceLocation RBraceLoc);
4377 
4378  ExprResult ActOnDesignatedInitializer(Designation &Desig,
4379  SourceLocation Loc,
4380  bool GNUSyntax,
4381  ExprResult Init);
4382 
4383 private:
4384  static BinaryOperatorKind ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind);
4385 
4386 public:
4387  ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
4388  tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
4389  ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
4390  BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
4391  ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
4392  Expr *LHSExpr, Expr *RHSExpr);
4393 
4394  void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc);
4395 
4396  /// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
4397  /// in the case of a the GNU conditional expr extension.
4398  ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
4399  SourceLocation ColonLoc,
4400  Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);
4401 
4402  /// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
4403  ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
4404  LabelDecl *TheDecl);
4405 
4406  void ActOnStartStmtExpr();
4407  ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
4408  SourceLocation RPLoc); // "({..})"
4409  void ActOnStmtExprError();
4410 
4411  // __builtin_offsetof(type, identifier(.identifier|[expr])*)
4414  bool isBrackets; // true if [expr], false if .ident
4415  union {
4418  } U;
4419  };
4420 
4421  /// __builtin_offsetof(type, a.b[123][456].c)
4422  ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
4423  TypeSourceInfo *TInfo,
4424  ArrayRef<OffsetOfComponent> Components,
4425  SourceLocation RParenLoc);
4426  ExprResult ActOnBuiltinOffsetOf(Scope *S,
4427  SourceLocation BuiltinLoc,
4429  ParsedType ParsedArgTy,
4430  ArrayRef<OffsetOfComponent> Components,
4431  SourceLocation RParenLoc);
4432 
4433  // __builtin_choose_expr(constExpr, expr1, expr2)
4434  ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
4435  Expr *CondExpr, Expr *LHSExpr,
4436  Expr *RHSExpr, SourceLocation RPLoc);
4437 
4438  // __builtin_va_arg(expr, type)
4439  ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
4440  SourceLocation RPLoc);
4441  ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
4442  TypeSourceInfo *TInfo, SourceLocation RPLoc);
4443 
4444  // __null
4445  ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);
4446 
4447  bool CheckCaseExpression(Expr *E);
4448 
4449  /// \brief Describes the result of an "if-exists" condition check.
4451  /// \brief The symbol exists.
4453 
4454  /// \brief The symbol does not exist.
4456 
4457  /// \brief The name is a dependent name, so the results will differ
4458  /// from one instantiation to the next.
4460 
4461  /// \brief An error occurred.
4462  IER_Error
4463  };
4464 
4466  CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
4467  const DeclarationNameInfo &TargetNameInfo);
4468 
4470  CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
4471  bool IsIfExists, CXXScopeSpec &SS,
4472  UnqualifiedId &Name);
4473 
4474  StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
4475  bool IsIfExists,
4476  NestedNameSpecifierLoc QualifierLoc,
4477  DeclarationNameInfo NameInfo,
4478  Stmt *Nested);
4479  StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
4480  bool IsIfExists,
4481  CXXScopeSpec &SS, UnqualifiedId &Name,
4482  Stmt *Nested);
4483 
4484  //===------------------------- "Block" Extension ------------------------===//
4485 
4486  /// ActOnBlockStart - This callback is invoked when a block literal is
4487  /// started.
4488  void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);
4489 
4490  /// ActOnBlockArguments - This callback allows processing of block arguments.
4491  /// If there are no arguments, this is still invoked.
4492  void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
4493  Scope *CurScope);
4494 
4495  /// ActOnBlockError - If there is an error parsing a block, this callback
4496  /// is invoked to pop the information about the block from the action impl.
4497  void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);
4498 
4499  /// ActOnBlockStmtExpr - This is called when the body of a block statement
4500  /// literal was successfully completed. ^(int x){...}
4501  ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
4502  Scope *CurScope);
4503 
4504  //===---------------------------- Clang Extensions ----------------------===//
4505 
4506  /// __builtin_convertvector(...)
4507  ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
4508  SourceLocation BuiltinLoc,
4509  SourceLocation RParenLoc);
4510 
4511  //===---------------------------- OpenCL Features -----------------------===//
4512 
4513  /// __builtin_astype(...)
4514  ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
4515  SourceLocation BuiltinLoc,
4516  SourceLocation RParenLoc);
4517 
4518  //===---------------------------- C++ Features --------------------------===//
4519 
4520  // Act on C++ namespaces
4521  Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
4522  SourceLocation NamespaceLoc,
4523  SourceLocation IdentLoc,
4524  IdentifierInfo *Ident,
4525  SourceLocation LBrace,
4526  AttributeList *AttrList,
4528  void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);
4529 
4530  NamespaceDecl *getStdNamespace() const;
4531  NamespaceDecl *getOrCreateStdNamespace();
4532 
4533  NamespaceDecl *lookupStdExperimentalNamespace();
4534 
4535  CXXRecordDecl *getStdBadAlloc() const;
4536  EnumDecl *getStdAlignValT() const;
4537 
4538  /// \brief Tests whether Ty is an instance of std::initializer_list and, if
4539  /// it is and Element is not NULL, assigns the element type to Element.
4540  bool isStdInitializerList(QualType Ty, QualType *Element);
4541 
4542  /// \brief Looks for the std::initializer_list template and instantiates it
4543  /// with Element, or emits an error if it's not found.
4544  ///
4545  /// \returns The instantiated template, or null on error.
4546  QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);
4547 
4548  /// \brief Determine whether Ctor is an initializer-list constructor, as
4549  /// defined in [dcl.init.list]p2.
4550  bool isInitListConstructor(const FunctionDecl *Ctor);
4551 
4552  Decl *ActOnUsingDirective(Scope *CurScope,
4553  SourceLocation UsingLoc,
4554  SourceLocation NamespcLoc,
4555  CXXScopeSpec &SS,
4556  SourceLocation IdentLoc,
4557  IdentifierInfo *NamespcName,
4558  AttributeList *AttrList);
4559 
4560  void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);
4561 
4562  Decl *ActOnNamespaceAliasDef(Scope *CurScope,
4563  SourceLocation NamespaceLoc,
4564  SourceLocation AliasLoc,
4565  IdentifierInfo *Alias,
4566  CXXScopeSpec &SS,
4567  SourceLocation IdentLoc,
4568  IdentifierInfo *Ident);
4569 
4570  void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
4571  bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
4572  const LookupResult &PreviousDecls,
4573  UsingShadowDecl *&PrevShadow);
4574  UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
4575  NamedDecl *Target,
4576  UsingShadowDecl *PrevDecl);
4577 
4578  bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
4579  bool HasTypenameKeyword,
4580  const CXXScopeSpec &SS,
4581  SourceLocation NameLoc,
4582  const LookupResult &Previous);
4583  bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
4584  bool HasTypename,
4585  const CXXScopeSpec &SS,
4586  const DeclarationNameInfo &NameInfo,
4587  SourceLocation NameLoc);
4588 
4589  NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
4590  SourceLocation UsingLoc,
4591  bool HasTypenameKeyword,
4592  SourceLocation TypenameLoc,
4593  CXXScopeSpec &SS,
4594  DeclarationNameInfo NameInfo,
4595  SourceLocation EllipsisLoc,
4596  AttributeList *AttrList,
4597  bool IsInstantiation);
4598  NamedDecl *BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
4599  ArrayRef<NamedDecl *> Expansions);
4600 
4601  bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);
4602 
4603  /// Given a derived-class using shadow declaration for a constructor and the
4604  /// correspnding base class constructor, find or create the implicit
4605  /// synthesized derived class constructor to use for this initialization.
4606  CXXConstructorDecl *
4607  findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor,
4608  ConstructorUsingShadowDecl *DerivedShadow);
4609 
4610  Decl *ActOnUsingDeclaration(Scope *CurScope,
4611  AccessSpecifier AS,
4612  SourceLocation UsingLoc,
4613  SourceLocation TypenameLoc,
4614  CXXScopeSpec &SS,
4615  UnqualifiedId &Name,
4616  SourceLocation EllipsisLoc,
4617  AttributeList *AttrList);
4618  Decl *ActOnAliasDeclaration(Scope *CurScope,
4619  AccessSpecifier AS,
4620  MultiTemplateParamsArg TemplateParams,
4621  SourceLocation UsingLoc,
4622  UnqualifiedId &Name,
4623  AttributeList *AttrList,
4624  TypeResult Type,
4625  Decl *DeclFromDeclSpec);
4626 
4627  /// BuildCXXConstructExpr - Creates a complete call to a constructor,
4628  /// including handling of its default argument expressions.
4629  ///
4630  /// \param ConstructKind - a CXXConstructExpr::ConstructionKind
4631  ExprResult
4632  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4633  NamedDecl *FoundDecl,
4634  CXXConstructorDecl *Constructor, MultiExprArg Exprs,
4635  bool HadMultipleCandidates, bool IsListInitialization,
4636  bool IsStdInitListInitialization,
4637  bool RequiresZeroInit, unsigned ConstructKind,
4638  SourceRange ParenRange);
4639 
4640  /// Build a CXXConstructExpr whose constructor has already been resolved if
4641  /// it denotes an inherited constructor.
4642  ExprResult
4643  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4644  CXXConstructorDecl *Constructor, bool Elidable,
4645  MultiExprArg Exprs,
4646  bool HadMultipleCandidates, bool IsListInitialization,
4647  bool IsStdInitListInitialization,
4648  bool RequiresZeroInit, unsigned ConstructKind,
4649  SourceRange ParenRange);
4650 
4651  // FIXME: Can we remove this and have the above BuildCXXConstructExpr check if
4652  // the constructor can be elidable?
4653  ExprResult
4654  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4655  NamedDecl *FoundDecl,
4656  CXXConstructorDecl *Constructor, bool Elidable,
4657  MultiExprArg Exprs, bool HadMultipleCandidates,
4658  bool IsListInitialization,
4659  bool IsStdInitListInitialization, bool RequiresZeroInit,
4660  unsigned ConstructKind, SourceRange ParenRange);
4661 
4662  ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field);
4663 
4664 
4665  /// Instantiate or parse a C++ default argument expression as necessary.
4666  /// Return true on error.
4667  bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
4668  ParmVarDecl *Param);
4669 
4670  /// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
4671  /// the default expr if needed.
4672  ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
4673  FunctionDecl *FD,
4674  ParmVarDecl *Param);
4675 
4676  /// FinalizeVarWithDestructor - Prepare for calling destructor on the
4677  /// constructed variable.
4678  void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);
4679 
4680  /// \brief Helper class that collects exception specifications for
4681  /// implicitly-declared special member functions.
4683  // Pointer to allow copying
4684  Sema *Self;
4685  // We order exception specifications thus:
4686  // noexcept is the most restrictive, but is only used in C++11.
4687  // throw() comes next.
4688  // Then a throw(collected exceptions)
4689  // Finally no specification, which is expressed as noexcept(false).
4690  // throw(...) is used instead if any called function uses it.
4691  ExceptionSpecificationType ComputedEST;
4692  llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
4693  SmallVector<QualType, 4> Exceptions;
4694 
4695  void ClearExceptions() {
4696  ExceptionsSeen.clear();
4697  Exceptions.clear();
4698  }
4699 
4700  public:
4702  : Self(&Self), ComputedEST(EST_BasicNoexcept) {
4703  if (!Self.getLangOpts().CPlusPlus11)
4704  ComputedEST = EST_DynamicNone;
4705  }
4706 
4707  /// \brief Get the computed exception specification type.
4709  assert(ComputedEST != EST_ComputedNoexcept &&
4710  "noexcept(expr) should not be a possible result");
4711  return ComputedEST;
4712  }
4713 
4714  /// \brief The number of exceptions in the exception specification.
4715  unsigned size() const { return Exceptions.size(); }
4716 
4717  /// \brief The set of exceptions in the exception specification.
4718  const QualType *data() const { return Exceptions.data(); }
4719 
4720  /// \brief Integrate another called method into the collected data.
4721  void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method);
4722 
4723  /// \brief Integrate an invoked expression into the collected data.
4724  void CalledExpr(Expr *E);
4725 
4726  /// \brief Overwrite an EPI's exception specification with this
4727  /// computed exception specification.
4730  ESI.Type = getExceptionSpecType();
4731  if (ESI.Type == EST_Dynamic) {
4732  ESI.Exceptions = Exceptions;
4733  } else if (ESI.Type == EST_None) {
4734  /// C++11 [except.spec]p14:
4735  /// The exception-specification is noexcept(false) if the set of
4736  /// potential exceptions of the special member function contains "any"
4737  ESI.Type = EST_ComputedNoexcept;
4739  tok::kw_false).get();
4740  }
4741  return ESI;
4742  }
4743  };
4744 
4745  /// \brief Determine what sort of exception specification a defaulted
4746  /// copy constructor of a class will have.
4748  ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
4749  CXXMethodDecl *MD);
4750 
4751  /// \brief Determine what sort of exception specification a defaulted
4752  /// default constructor of a class will have, and whether the parameter
4753  /// will be const.
4755  ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD);
4756 
4757  /// \brief Determine what sort of exception specification a defautled
4758  /// copy assignment operator of a class will have, and whether the
4759  /// parameter will be const.
4761  ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD);
4762 
4763  /// \brief Determine what sort of exception specification a defaulted move
4764  /// constructor of a class will have.
4766  ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD);
4767 
4768  /// \brief Determine what sort of exception specification a defaulted move
4769  /// assignment operator of a class will have.
4771  ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD);
4772 
4773  /// \brief Determine what sort of exception specification a defaulted
4774  /// destructor of a class will have.
4776  ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD);
4777 
4778  /// \brief Determine what sort of exception specification an inheriting
4779  /// constructor of a class will have.
4781  ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
4782  CXXConstructorDecl *CD);
4783 
4784  /// \brief Evaluate the implicit exception specification for a defaulted
4785  /// special member function.
4786  void EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD);
4787 
4788  /// \brief Check the given exception-specification and update the
4789  /// exception specification information with the results.
4790  void checkExceptionSpecification(bool IsTopLevel,
4792  ArrayRef<ParsedType> DynamicExceptions,
4793  ArrayRef<SourceRange> DynamicExceptionRanges,
4794  Expr *NoexceptExpr,
4795  SmallVectorImpl<QualType> &Exceptions,
4797 
4798  /// \brief Determine if we're in a case where we need to (incorrectly) eagerly
4799  /// parse an exception specification to work around a libstdc++ bug.
4800  bool isLibstdcxxEagerExceptionSpecHack(const Declarator &D);
4801 
4802  /// \brief Add an exception-specification to the given member function
4803  /// (or member function template). The exception-specification was parsed
4804  /// after the method itself was declared.
4805  void actOnDelayedExceptionSpecification(Decl *Method,
4807  SourceRange SpecificationRange,
4808  ArrayRef<ParsedType> DynamicExceptions,
4809  ArrayRef<SourceRange> DynamicExceptionRanges,
4810  Expr *NoexceptExpr);
4811 
4813 
4814  /// \brief Determine if a special member function should have a deleted
4815  /// definition when it is defaulted.
4816  bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
4817  InheritedConstructorInfo *ICI = nullptr,
4818  bool Diagnose = false);
4819 
4820  /// \brief Declare the implicit default constructor for the given class.
4821  ///
4822  /// \param ClassDecl The class declaration into which the implicit
4823  /// default constructor will be added.
4824  ///
4825  /// \returns The implicitly-declared default constructor.
4826  CXXConstructorDecl *DeclareImplicitDefaultConstructor(
4827  CXXRecordDecl *ClassDecl);
4828 
4829  /// DefineImplicitDefaultConstructor - Checks for feasibility of
4830  /// defining this constructor as the default constructor.
4831  void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
4832  CXXConstructorDecl *Constructor);
4833 
4834  /// \brief Declare the implicit destructor for the given class.
4835  ///
4836  /// \param ClassDecl The class declaration into which the implicit
4837  /// destructor will be added.
4838  ///
4839  /// \returns The implicitly-declared destructor.
4840  CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);
4841 
4842  /// DefineImplicitDestructor - Checks for feasibility of
4843  /// defining this destructor as the default destructor.
4844  void DefineImplicitDestructor(SourceLocation CurrentLocation,
4845  CXXDestructorDecl *Destructor);
4846 
4847  /// \brief Build an exception spec for destructors that don't have one.
4848  ///
4849  /// C++11 says that user-defined destructors with no exception spec get one
4850  /// that looks as if the destructor was implicitly declared.
4851  void AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
4852  CXXDestructorDecl *Destructor);
4853 
4854  /// \brief Define the specified inheriting constructor.
4855  void DefineInheritingConstructor(SourceLocation UseLoc,
4856  CXXConstructorDecl *Constructor);
4857 
4858  /// \brief Declare the implicit copy constructor for the given class.
4859  ///
4860  /// \param ClassDecl The class declaration into which the implicit
4861  /// copy constructor will be added.
4862  ///
4863  /// \returns The implicitly-declared copy constructor.
4864  CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);
4865 
4866  /// DefineImplicitCopyConstructor - Checks for feasibility of
4867  /// defining this constructor as the copy constructor.
4868  void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
4869  CXXConstructorDecl *Constructor);
4870 
4871  /// \brief Declare the implicit move constructor for the given class.
4872  ///
4873  /// \param ClassDecl The Class declaration into which the implicit
4874  /// move constructor will be added.
4875  ///
4876  /// \returns The implicitly-declared move constructor, or NULL if it wasn't
4877  /// declared.
4878  CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);
4879 
4880  /// DefineImplicitMoveConstructor - Checks for feasibility of
4881  /// defining this constructor as the move constructor.
4882  void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
4883  CXXConstructorDecl *Constructor);
4884 
4885  /// \brief Declare the implicit copy assignment operator for the given class.
4886  ///
4887  /// \param ClassDecl The class declaration into which the implicit
4888  /// copy assignment operator will be added.
4889  ///
4890  /// \returns The implicitly-declared copy assignment operator.
4891  CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);
4892 
4893  /// \brief Defines an implicitly-declared copy assignment operator.
4894  void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
4895  CXXMethodDecl *MethodDecl);
4896 
4897  /// \brief Declare the implicit move assignment operator for the given class.
4898  ///
4899  /// \param ClassDecl The Class declaration into which the implicit
4900  /// move assignment operator will be added.
4901  ///
4902  /// \returns The implicitly-declared move assignment operator, or NULL if it
4903  /// wasn't declared.
4904  CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);
4905 
4906  /// \brief Defines an implicitly-declared move assignment operator.
4907  void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
4908  CXXMethodDecl *MethodDecl);
4909 
4910  /// \brief Force the declaration of any implicitly-declared members of this
4911  /// class.
4912  void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);
4913 
4914  /// \brief Check a completed declaration of an implicit special member.
4915  void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD);
4916 
4917  /// \brief Determine whether the given function is an implicitly-deleted
4918  /// special member function.
4919  bool isImplicitlyDeleted(FunctionDecl *FD);
4920 
4921  /// \brief Check whether 'this' shows up in the type of a static member
4922  /// function after the (naturally empty) cv-qualifier-seq would be.
4923  ///
4924  /// \returns true if an error occurred.
4925  bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);
4926 
4927  /// \brief Whether this' shows up in the exception specification of a static
4928  /// member function.
4929  bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);
4930 
4931  /// \brief Check whether 'this' shows up in the attributes of the given
4932  /// static member function.
4933  ///
4934  /// \returns true if an error occurred.
4935  bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);
4936 
4937  /// MaybeBindToTemporary - If the passed in expression has a record type with
4938  /// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
4939  /// it simply returns the passed in expression.
4940  ExprResult MaybeBindToTemporary(Expr *E);
4941 
4942  bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
4943  MultiExprArg ArgsPtr,
4944  SourceLocation Loc,
4945  SmallVectorImpl<Expr*> &ConvertedArgs,
4946  bool AllowExplicit = false,
4947  bool IsListInitialization = false);
4948 
4949  ParsedType getInheritingConstructorName(CXXScopeSpec &SS,
4950  SourceLocation NameLoc,
4951  IdentifierInfo &Name);
4952 
4953  ParsedType getDestructorName(SourceLocation TildeLoc,
4954  IdentifierInfo &II, SourceLocation NameLoc,
4955  Scope *S, CXXScopeSpec &SS,
4956  ParsedType ObjectType,
4957  bool EnteringContext);
4958 
4959  ParsedType getDestructorTypeForDecltype(const DeclSpec &DS,
4960  ParsedType ObjectType);
4961 
4962  // Checks that reinterpret casts don't have undefined behavior.
4963  void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
4964  bool IsDereference, SourceRange Range);
4965 
4966  /// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
4967  ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
4969  SourceLocation LAngleBracketLoc,
4970  Declarator &D,
4971  SourceLocation RAngleBracketLoc,
4972  SourceLocation LParenLoc,
4973  Expr *E,
4974  SourceLocation RParenLoc);
4975 
4976  ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
4977  tok::TokenKind Kind,
4978  TypeSourceInfo *Ty,
4979  Expr *E,
4980  SourceRange AngleBrackets,
4981  SourceRange Parens);
4982 
4983  ExprResult BuildCXXTypeId(QualType TypeInfoType,
4984  SourceLocation TypeidLoc,
4985  TypeSourceInfo *Operand,
4986  SourceLocation RParenLoc);
4987  ExprResult BuildCXXTypeId(QualType TypeInfoType,
4988  SourceLocation TypeidLoc,
4989  Expr *Operand,
4990  SourceLocation RParenLoc);
4991 
4992  /// ActOnCXXTypeid - Parse typeid( something ).
4993  ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
4994  SourceLocation LParenLoc, bool isType,
4995  void *TyOrExpr,
4996  SourceLocation RParenLoc);
4997 
4998  ExprResult BuildCXXUuidof(QualType TypeInfoType,
4999  SourceLocation TypeidLoc,
5000  TypeSourceInfo *Operand,
5001  SourceLocation RParenLoc);
5002  ExprResult BuildCXXUuidof(QualType TypeInfoType,
5003  SourceLocation TypeidLoc,
5004  Expr *Operand,
5005  SourceLocation RParenLoc);
5006 
5007  /// ActOnCXXUuidof - Parse __uuidof( something ).
5008  ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
5009  SourceLocation LParenLoc, bool isType,
5010  void *TyOrExpr,
5011  SourceLocation RParenLoc);
5012 
5013  /// \brief Handle a C++1z fold-expression: ( expr op ... op expr ).
5014  ExprResult ActOnCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
5015  tok::TokenKind Operator,
5016  SourceLocation EllipsisLoc, Expr *RHS,
5017  SourceLocation RParenLoc);
5018  ExprResult BuildCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
5019  BinaryOperatorKind Operator,
5020  SourceLocation EllipsisLoc, Expr *RHS,
5021  SourceLocation RParenLoc);
5022  ExprResult BuildEmptyCXXFoldExpr(SourceLocation EllipsisLoc,
5023  BinaryOperatorKind Operator);
5024 
5025  //// ActOnCXXThis - Parse 'this' pointer.
5026  ExprResult ActOnCXXThis(SourceLocation loc);
5027 
5028  /// \brief Try to retrieve the type of the 'this' pointer.
5029  ///
5030  /// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
5031  QualType getCurrentThisType();
5032 
5033  /// \brief When non-NULL, the C++ 'this' expression is allowed despite the
5034  /// current context not being a non-static member function. In such cases,
5035  /// this provides the type used for 'this'.
5037 
5038  /// \brief RAII object used to temporarily allow the C++ 'this' expression
5039  /// to be used, with the given qualifiers on the current class type.
5041  Sema &S;
5042  QualType OldCXXThisTypeOverride;
5043  bool Enabled;
5044 
5045  public:
5046  /// \brief Introduce a new scope where 'this' may be allowed (when enabled),
5047  /// using the given declaration (which is either a class template or a
5048  /// class) along with the given qualifiers.
5049  /// along with the qualifiers placed on '*this'.
5050  CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
5051  bool Enabled = true);
5052 
5053  ~CXXThisScopeRAII();
5054  };
5055 
5056  /// \brief Make sure the value of 'this' is actually available in the current
5057  /// context, if it is a potentially evaluated context.
5058  ///
5059  /// \param Loc The location at which the capture of 'this' occurs.
5060  ///
5061  /// \param Explicit Whether 'this' is explicitly captured in a lambda
5062  /// capture list.
5063  ///
5064  /// \param FunctionScopeIndexToStopAt If non-null, it points to the index
5065  /// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
5066  /// This is useful when enclosing lambdas must speculatively capture
5067  /// 'this' that may or may not be used in certain specializations of
5068  /// a nested generic lambda (depending on whether the name resolves to
5069  /// a non-static member function or a static function).
5070  /// \return returns 'true' if failed, 'false' if success.
5071  bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false,
5072  bool BuildAndDiagnose = true,
5073  const unsigned *const FunctionScopeIndexToStopAt = nullptr,
5074  bool ByCopy = false);
5075 
5076  /// \brief Determine whether the given type is the type of *this that is used
5077  /// outside of the body of a member function for a type that is currently
5078  /// being defined.
5079  bool isThisOutsideMemberFunctionBody(QualType BaseType);
5080 
5081  /// ActOnCXXBoolLiteral - Parse {true,false} literals.
5082  ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
5083 
5084 
5085  /// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
5086  ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
5087 
5088  ExprResult
5089  ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef<AvailabilitySpec> AvailSpecs,
5090  SourceLocation AtLoc, SourceLocation RParen);
5091 
5092  /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
5093  ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);
5094 
5095  //// ActOnCXXThrow - Parse throw expressions.
5096  ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
5097  ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
5098  bool IsThrownVarInScope);
5099  bool CheckCXXThrowOperand(SourceLocation ThrowLoc, QualType ThrowTy, Expr *E);
5100 
5101  /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
5102  /// Can be interpreted either as function-style casting ("int(x)")
5103  /// or class type construction ("ClassType(x,y,z)")
5104  /// or creation of a value-initialized type ("int()").
5105  ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
5106  SourceLocation LParenLoc,
5107  MultiExprArg Exprs,
5108  SourceLocation RParenLoc);
5109 
5110  ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
5111  SourceLocation LParenLoc,
5112  MultiExprArg Exprs,
5113  SourceLocation RParenLoc);
5114 
5115  /// ActOnCXXNew - Parsed a C++ 'new' expression.
5116  ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
5117  SourceLocation PlacementLParen,
5118  MultiExprArg PlacementArgs,
5119  SourceLocation PlacementRParen,
5120  SourceRange TypeIdParens, Declarator &D,
5121  Expr *Initializer);
5122  ExprResult BuildCXXNew(SourceRange Range, bool UseGlobal,
5123  SourceLocation PlacementLParen,
5124  MultiExprArg PlacementArgs,
5125  SourceLocation PlacementRParen,
5126  SourceRange TypeIdParens,
5127  QualType AllocType,
5128  TypeSourceInfo *AllocTypeInfo,
5129  Expr *ArraySize,
5130  SourceRange DirectInitRange,
5131  Expr *Initializer);
5132 
5133  bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
5134  SourceRange R);
5135  bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
5136  bool UseGlobal, QualType AllocType, bool IsArray,
5137  bool &PassAlignment, MultiExprArg PlaceArgs,
5138  FunctionDecl *&OperatorNew,
5139  FunctionDecl *&OperatorDelete);
5140  void DeclareGlobalNewDelete();
5141  void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
5142  ArrayRef<QualType> Params);
5143 
5144  bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
5145  DeclarationName Name, FunctionDecl* &Operator,
5146  bool Diagnose = true);
5147  FunctionDecl *FindUsualDeallocationFunction(SourceLocation StartLoc,
5148  bool CanProvideSize,
5149  bool Overaligned,
5150  DeclarationName Name);
5151  FunctionDecl *FindDeallocationFunctionForDestructor(SourceLocation StartLoc,
5152  CXXRecordDecl *RD);
5153 
5154  /// ActOnCXXDelete - Parsed a C++ 'delete' expression
5155  ExprResult ActOnCXXDelete(SourceLocation StartLoc,
5156  bool UseGlobal, bool ArrayForm,
5157  Expr *Operand);
5158  void CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
5159  bool IsDelete, bool CallCanBeVirtual,
5160  bool WarnOnNonAbstractTypes,
5161  SourceLocation DtorLoc);
5162 
5163  ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
5164  Expr *Operand, SourceLocation RParen);
5165  ExprResult BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand,
5166  SourceLocation RParen);
5167 
5168  /// \brief Parsed one of the type trait support pseudo-functions.
5169  ExprResult ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
5170  ArrayRef<ParsedType> Args,
5171  SourceLocation RParenLoc);
5172  ExprResult BuildTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
5174  SourceLocation RParenLoc);
5175 
5176  /// ActOnArrayTypeTrait - Parsed one of the binary type trait support
5177  /// pseudo-functions.
5178  ExprResult ActOnArrayTypeTrait(ArrayTypeTrait ATT,
5179  SourceLocation KWLoc,
5180  ParsedType LhsTy,
5181