clang  7.0.0svn
Sema.h
Go to the documentation of this file.
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 TemplateInstantiationCallback;
176  class TemplateParameterList;
177  class TemplatePartialOrderingContext;
178  class TemplateTemplateParmDecl;
179  class Token;
180  class TypeAliasDecl;
181  class TypedefDecl;
182  class TypedefNameDecl;
183  class TypeLoc;
184  class TypoCorrectionConsumer;
185  class UnqualifiedId;
186  class UnresolvedLookupExpr;
187  class UnresolvedMemberExpr;
188  class UnresolvedSetImpl;
189  class UnresolvedSetIterator;
190  class UsingDecl;
191  class UsingShadowDecl;
192  class ValueDecl;
193  class VarDecl;
194  class VarTemplateSpecializationDecl;
195  class VisibilityAttr;
196  class VisibleDeclConsumer;
197  class IndirectFieldDecl;
198  struct DeductionFailureInfo;
199  class TemplateSpecCandidateSet;
200 
201 namespace sema {
202  class AccessedEntity;
203  class BlockScopeInfo;
204  class CapturedRegionScopeInfo;
205  class CapturingScopeInfo;
206  class CompoundScopeInfo;
207  class DelayedDiagnostic;
208  class DelayedDiagnosticPool;
209  class FunctionScopeInfo;
210  class LambdaScopeInfo;
211  class PossiblyUnreachableDiag;
212  class SemaPPCallbacks;
213  class TemplateDeductionInfo;
214 }
215 
216 namespace threadSafety {
217  class BeforeSet;
218  void threadSafetyCleanup(BeforeSet* Cache);
219 }
220 
221 // FIXME: No way to easily map from TemplateTypeParmTypes to
222 // TemplateTypeParmDecls, so we have this horrible PointerUnion.
223 typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
225 
226 /// Describes whether we've seen any nullability information for the given
227 /// file.
229  /// The first pointer declarator (of any pointer kind) in the file that does
230  /// not have a corresponding nullability annotation.
232 
233  /// The end location for the first pointer declarator in the file. Used for
234  /// placing fix-its.
236 
237  /// Which kind of pointer declarator we saw.
238  uint8_t PointerKind;
239 
240  /// Whether we saw any type nullability annotations in the given file.
241  bool SawTypeNullability = false;
242 };
243 
244 /// A mapping from file IDs to a record of whether we've seen nullability
245 /// information in that file.
247  /// A mapping from file IDs to the nullability information for each file ID.
248  llvm::DenseMap<FileID, FileNullability> Map;
249 
250  /// A single-element cache based on the file ID.
251  struct {
254  } Cache;
255 
256 public:
258  // Check the single-element cache.
259  if (file == Cache.File)
260  return Cache.Nullability;
261 
262  // It's not in the single-element cache; flush the cache if we have one.
263  if (!Cache.File.isInvalid()) {
264  Map[Cache.File] = Cache.Nullability;
265  }
266 
267  // Pull this entry into the cache.
268  Cache.File = file;
269  Cache.Nullability = Map[file];
270  return Cache.Nullability;
271  }
272 };
273 
274 /// Sema - This implements semantic analysis and AST building for C.
275 class Sema {
276  Sema(const Sema &) = delete;
277  void operator=(const Sema &) = delete;
278 
279  ///\brief Source of additional semantic information.
280  ExternalSemaSource *ExternalSource;
281 
282  ///\brief Whether Sema has generated a multiplexer and has to delete it.
283  bool isMultiplexExternalSource;
284 
285  static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
286 
287  bool isVisibleSlow(const NamedDecl *D);
288 
289  /// Determine whether two declarations should be linked together, given that
290  /// the old declaration might not be visible and the new declaration might
291  /// not have external linkage.
292  bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
293  const NamedDecl *New) {
294  if (isVisible(Old))
295  return true;
296  // See comment in below overload for why it's safe to compute the linkage
297  // of the new declaration here.
298  if (New->isExternallyDeclarable()) {
299  assert(Old->isExternallyDeclarable() &&
300  "should not have found a non-externally-declarable previous decl");
301  return true;
302  }
303  return false;
304  }
305  bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);
306 
307 public:
311 
314 
321 
322  /// \brief Flag indicating whether or not to collect detailed statistics.
324 
325  /// \brief Code-completion consumer.
327 
328  /// CurContext - This is the current declaration context of parsing.
330 
331  /// \brief Generally null except when we temporarily switch decl contexts,
332  /// like in \see ActOnObjCTemporaryExitContainerContext.
334 
335  /// VAListTagName - The declaration name corresponding to __va_list_tag.
336  /// This is used as part of a hack to omit that class from ADL results.
338 
339  bool MSStructPragmaOn; // True when \#pragma ms_struct on
340 
341  /// \brief Controls member pointer representation format under the MS ABI.
344 
345  /// Stack of active SEH __finally scopes. Can be empty.
347 
348  /// \brief Source location for newly created implicit MSInheritanceAttrs
350 
351  /// \brief pragma clang section kind
353  PCSK_Invalid = 0,
354  PCSK_BSS = 1,
355  PCSK_Data = 2,
356  PCSK_Rodata = 3,
357  PCSK_Text = 4
358  };
359 
361  PCSA_Set = 0,
362  PCSA_Clear = 1
363  };
364 
366  std::string SectionName;
367  bool Valid = false;
369 
370  void Act(SourceLocation PragmaLocation,
372  StringLiteral* Name);
373  };
374 
379 
381  PSK_Reset = 0x0, // #pragma ()
382  PSK_Set = 0x1, // #pragma (value)
383  PSK_Push = 0x2, // #pragma (push[, id])
384  PSK_Pop = 0x4, // #pragma (pop[, id])
385  PSK_Show = 0x8, // #pragma (show) -- only for "pack"!
386  PSK_Push_Set = PSK_Push | PSK_Set, // #pragma (push[, id], value)
387  PSK_Pop_Set = PSK_Pop | PSK_Set, // #pragma (pop[, id], value)
388  };
389 
390  template<typename ValueType>
391  struct PragmaStack {
392  struct Slot {
393  llvm::StringRef StackSlotLabel;
394  ValueType Value;
397  Slot(llvm::StringRef StackSlotLabel, ValueType Value,
398  SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
399  : StackSlotLabel(StackSlotLabel), Value(Value),
400  PragmaLocation(PragmaLocation),
401  PragmaPushLocation(PragmaPushLocation) {}
402  };
403  void Act(SourceLocation PragmaLocation,
404  PragmaMsStackAction Action,
405  llvm::StringRef StackSlotLabel,
406  ValueType Value);
407 
408  // MSVC seems to add artificial slots to #pragma stacks on entering a C++
409  // method body to restore the stacks on exit, so it works like this:
410  //
411  // struct S {
412  // #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
413  // void Method {}
414  // #pragma <name>(pop, InternalPragmaSlot)
415  // };
416  //
417  // It works even with #pragma vtordisp, although MSVC doesn't support
418  // #pragma vtordisp(push [, id], n)
419  // syntax.
420  //
421  // Push / pop a named sentinel slot.
422  void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
423  assert((Action == PSK_Push || Action == PSK_Pop) &&
424  "Can only push / pop #pragma stack sentinels!");
425  Act(CurrentPragmaLocation, Action, Label, CurrentValue);
426  }
427 
428  // Constructors.
429  explicit PragmaStack(const ValueType &Default)
430  : DefaultValue(Default), CurrentValue(Default) {}
431 
432  bool hasValue() const { return CurrentValue != DefaultValue; }
433 
435  ValueType DefaultValue; // Value used for PSK_Reset action.
436  ValueType CurrentValue;
438  };
439  // FIXME: We should serialize / deserialize these if they occur in a PCH (but
440  // we shouldn't do so if they're in a module).
441 
442  /// \brief Whether to insert vtordisps prior to virtual bases in the Microsoft
443  /// C++ ABI. Possible values are 0, 1, and 2, which mean:
444  ///
445  /// 0: Suppress all vtordisps
446  /// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
447  /// structors
448  /// 2: Always insert vtordisps to support RTTI on partially constructed
449  /// objects
451  // #pragma pack.
452  // Sentinel to represent when the stack is set to mac68k alignment.
453  static const unsigned kMac68kAlignmentSentinel = ~0U;
455  // The current #pragma pack values and locations at each #include.
457  unsigned CurrentValue;
459  bool HasNonDefaultValue, ShouldWarnOnInclude;
460  };
462  // Segment #pragmas.
467 
468  // RAII object to push / pop sentinel slots for all MS #pragma stacks.
469  // Actions should be performed only if we enter / exit a C++ method body.
471  public:
472  PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
474 
475  private:
476  Sema &S;
477  StringRef SlotLabel;
478  bool ShouldAct;
479  };
480 
481  /// A mapping that describes the nullability we've seen in each header file.
483 
484  /// Last section used with #pragma init_seg.
487 
488  /// VisContext - Manages the stack for \#pragma GCC visibility.
489  void *VisContext; // Really a "PragmaVisStack*"
490 
491  /// \brief This represents the stack of attributes that were pushed by
492  /// \#pragma clang attribute.
497  bool IsUsed;
498  };
500 
501  /// \brief The declaration that is currently receiving an attribute from the
502  /// #pragma attribute stack.
504 
505  /// \brief This represents the last location of a "#pragma clang optimize off"
506  /// directive if such a directive has not been closed by an "on" yet. If
507  /// optimizations are currently "on", this is set to an invalid location.
509 
510  /// \brief Flag indicating if Sema is building a recovery call expression.
511  ///
512  /// This flag is used to avoid building recovery call expressions
513  /// if Sema is already doing so, which would cause infinite recursions.
515 
516  /// Used to control the generation of ExprWithCleanups.
518 
519  /// ExprCleanupObjects - This is the stack of objects requiring
520  /// cleanup that are created by the current full expression. The
521  /// element type here is ExprWithCleanups::Object.
523 
524  /// \brief Store a list of either DeclRefExprs or MemberExprs
525  /// that contain a reference to a variable (constant) that may or may not
526  /// be odr-used in this Expr, and we won't know until all lvalue-to-rvalue
527  /// and discarded value conversions have been applied to all subexpressions
528  /// of the enclosing full expression. This is cleared at the end of each
529  /// full expression.
530  llvm::SmallPtrSet<Expr*, 2> MaybeODRUseExprs;
531 
532  /// \brief Stack containing information about each of the nested
533  /// function, block, and method scopes that are currently active.
534  ///
535  /// This array is never empty. Clients should ignore the first
536  /// element, which is used to cache a single FunctionScopeInfo
537  /// that's used to parse every top-level function.
539 
541  &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
543 
544  /// ExtVectorDecls - This is a list all the extended vector types. This allows
545  /// us to associate a raw vector type with one of the ext_vector type names.
546  /// This is only necessary for issuing pretty diagnostics.
548 
549  /// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
550  std::unique_ptr<CXXFieldCollector> FieldCollector;
551 
553 
554  /// \brief Set containing all declared private fields that are not used.
555  NamedDeclSetType UnusedPrivateFields;
556 
557  /// \brief Set containing all typedefs that are likely unused.
560 
561  /// \brief Delete-expressions to be analyzed at the end of translation unit
562  ///
563  /// This list contains class members, and locations of delete-expressions
564  /// that could not be proven as to whether they mismatch with new-expression
565  /// used in initializer of the field.
566  typedef std::pair<SourceLocation, bool> DeleteExprLoc;
568  llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;
569 
570  typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
571 
572  /// PureVirtualClassDiagSet - a set of class declarations which we have
573  /// emitted a list of pure virtual functions. Used to prevent emitting the
574  /// same list more than once.
575  std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;
576 
577  /// ParsingInitForAutoVars - a set of declarations with auto types for which
578  /// we are currently parsing the initializer.
579  llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
580 
581  /// \brief Look for a locally scoped extern "C" declaration by the given name.
582  NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);
583 
584  typedef LazyVector<VarDecl *, ExternalSemaSource,
585  &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
587 
588  /// \brief All the tentative definitions encountered in the TU.
590 
591  typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
592  &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
594 
595  /// \brief The set of file scoped decls seen so far that have not been used
596  /// and must warn if not used. Only contains the first declaration.
598 
599  typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
600  &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
602 
603  /// \brief All the delegating constructors seen so far in the file, used for
604  /// cycle detection at the end of the TU.
606 
607  /// \brief All the overriding functions seen during a class definition
608  /// that had their exception spec checks delayed, plus the overridden
609  /// function.
612 
613  /// \brief All the members seen during a class definition which were both
614  /// explicitly defaulted and had explicitly-specified exception
615  /// specifications, along with the function type containing their
616  /// user-specified exception specification. Those exception specifications
617  /// were overridden with the default specifications, but we still need to
618  /// check whether they are compatible with the default specification, and
619  /// we can't do that until the nesting set of class definitions is complete.
622 
623  typedef llvm::MapVector<const FunctionDecl *,
624  std::unique_ptr<LateParsedTemplate>>
627 
628  /// \brief Callback to the parser to parse templated functions when needed.
629  typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
630  typedef void LateTemplateParserCleanupCB(void *P);
631  LateTemplateParserCB *LateTemplateParser;
632  LateTemplateParserCleanupCB *LateTemplateParserCleanup;
634 
635  void SetLateTemplateParser(LateTemplateParserCB *LTP,
636  LateTemplateParserCleanupCB *LTPCleanup,
637  void *P) {
638  LateTemplateParser = LTP;
639  LateTemplateParserCleanup = LTPCleanup;
640  OpaqueParser = P;
641  }
642 
643  class DelayedDiagnostics;
644 
646  sema::DelayedDiagnosticPool *SavedPool;
648  };
651 
652  /// A class which encapsulates the logic for delaying diagnostics
653  /// during parsing and other processing.
655  /// \brief The current pool of diagnostics into which delayed
656  /// diagnostics should go.
658 
659  public:
660  DelayedDiagnostics() : CurPool(nullptr) {}
661 
662  /// Adds a delayed diagnostic.
663  void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h
664 
665  /// Determines whether diagnostics should be delayed.
666  bool shouldDelayDiagnostics() { return CurPool != nullptr; }
667 
668  /// Returns the current delayed-diagnostics pool.
670  return CurPool;
671  }
672 
673  /// Enter a new scope. Access and deprecation diagnostics will be
674  /// collected in this pool.
677  state.SavedPool = CurPool;
678  CurPool = &pool;
679  return state;
680  }
681 
682  /// Leave a delayed-diagnostic state that was previously pushed.
683  /// Do not emit any of the diagnostics. This is performed as part
684  /// of the bookkeeping of popping a pool "properly".
686  CurPool = state.SavedPool;
687  }
688 
689  /// Enter a new scope where access and deprecation diagnostics are
690  /// not delayed.
693  state.SavedPool = CurPool;
694  CurPool = nullptr;
695  return state;
696  }
697 
698  /// Undo a previous pushUndelayed().
700  assert(CurPool == nullptr);
701  CurPool = state.SavedPool;
702  }
704 
705  /// A RAII object to temporarily push a declaration context.
706  class ContextRAII {
707  private:
708  Sema &S;
709  DeclContext *SavedContext;
710  ProcessingContextState SavedContextState;
711  QualType SavedCXXThisTypeOverride;
712 
713  public:
714  ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
715  : S(S), SavedContext(S.CurContext),
716  SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
717  SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
718  {
719  assert(ContextToPush && "pushing null context");
720  S.CurContext = ContextToPush;
721  if (NewThisContext)
723  }
724 
725  void pop() {
726  if (!SavedContext) return;
727  S.CurContext = SavedContext;
728  S.DelayedDiagnostics.popUndelayed(SavedContextState);
729  S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
730  SavedContext = nullptr;
731  }
732 
734  pop();
735  }
736  };
737 
738  /// \brief RAII object to handle the state changes required to synthesize
739  /// a function body.
741  Sema &S;
742  Sema::ContextRAII SavedContext;
743  bool PushedCodeSynthesisContext = false;
744 
745  public:
747  : S(S), SavedContext(S, DC) {
748  S.PushFunctionScope();
750  Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
751  if (auto *FD = dyn_cast<FunctionDecl>(DC))
752  FD->setWillHaveBody(true);
753  else
754  assert(isa<ObjCMethodDecl>(DC));
755  }
756 
758  assert(!PushedCodeSynthesisContext);
759 
761  Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
762  Ctx.PointOfInstantiation = UseLoc;
763  Ctx.Entity = cast<Decl>(S.CurContext);
765 
766  PushedCodeSynthesisContext = true;
767  }
768 
770  if (PushedCodeSynthesisContext)
772  if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
773  FD->setWillHaveBody(false);
776  }
777  };
778 
779  /// WeakUndeclaredIdentifiers - Identifiers contained in
780  /// \#pragma weak before declared. rare. may alias another
781  /// identifier, declared or undeclared
782  llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;
783 
784  /// ExtnameUndeclaredIdentifiers - Identifiers contained in
785  /// \#pragma redefine_extname before declared. Used in Solaris system headers
786  /// to define functions that occur in multiple standards to call the version
787  /// in the currently selected standard.
788  llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;
789 
790 
791  /// \brief Load weak undeclared identifiers from the external source.
792  void LoadExternalWeakUndeclaredIdentifiers();
793 
794  /// WeakTopLevelDecl - Translation-unit scoped declarations generated by
795  /// \#pragma weak during processing of other Decls.
796  /// I couldn't figure out a clean way to generate these in-line, so
797  /// we store them here and handle separately -- which is a hack.
798  /// It would be best to refactor this.
800 
802 
803  /// Translation Unit Scope - useful to Objective-C actions that need
804  /// to lookup file scope declarations in the "ordinary" C decl namespace.
805  /// For example, user-defined classes, built-in "id" type, etc.
807 
808  /// \brief The C++ "std" namespace, where the standard library resides.
810 
811  /// \brief The C++ "std::bad_alloc" class, which is defined by the C++
812  /// standard library.
814 
815  /// \brief The C++ "std::align_val_t" enum class, which is defined by the C++
816  /// standard library.
818 
819  /// \brief The C++ "std::experimental" namespace, where the experimental parts
820  /// of the standard library resides.
822 
823  /// \brief The C++ "std::initializer_list" template, which is defined in
824  /// <initializer_list>.
826 
827  /// \brief The C++ "type_info" declaration, which is defined in <typeinfo>.
829 
830  /// \brief The MSVC "_GUID" struct, which is defined in MSVC header files.
832 
833  /// \brief Caches identifiers/selectors for NSFoundation APIs.
834  std::unique_ptr<NSAPI> NSAPIObj;
835 
836  /// \brief The declaration of the Objective-C NSNumber class.
838 
839  /// \brief The declaration of the Objective-C NSValue class.
841 
842  /// \brief Pointer to NSNumber type (NSNumber *).
844 
845  /// \brief Pointer to NSValue type (NSValue *).
847 
848  /// \brief The Objective-C NSNumber methods used to create NSNumber literals.
849  ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
850 
851  /// \brief The declaration of the Objective-C NSString class.
853 
854  /// \brief Pointer to NSString type (NSString *).
856 
857  /// \brief The declaration of the stringWithUTF8String: method.
859 
860  /// \brief The declaration of the valueWithBytes:objCType: method.
862 
863  /// \brief The declaration of the Objective-C NSArray class.
865 
866  /// \brief The declaration of the arrayWithObjects:count: method.
868 
869  /// \brief The declaration of the Objective-C NSDictionary class.
871 
872  /// \brief The declaration of the dictionaryWithObjects:forKeys:count: method.
874 
875  /// \brief id<NSCopying> type.
877 
878  /// \brief will hold 'respondsToSelector:'
880 
881  /// A flag to remember whether the implicit forms of operator new and delete
882  /// have been declared.
884 
885  /// A flag to indicate that we're in a context that permits abstract
886  /// references to fields. This is really a
888 
889  /// \brief Describes how the expressions currently being parsed are
890  /// evaluated at run-time, if at all.
892  /// \brief The current expression and its subexpressions occur within an
893  /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
894  /// \c sizeof, where the type of the expression may be significant but
895  /// no code will be generated to evaluate the value of the expression at
896  /// run time.
897  Unevaluated,
898 
899  /// \brief The current expression occurs within a braced-init-list within
900  /// an unevaluated operand. This is mostly like a regular unevaluated
901  /// context, except that we still instantiate constexpr functions that are
902  /// referenced here so that we can perform narrowing checks correctly.
903  UnevaluatedList,
904 
905  /// \brief The current expression occurs within a discarded statement.
906  /// This behaves largely similarly to an unevaluated operand in preventing
907  /// definitions from being required, but not in other ways.
908  DiscardedStatement,
909 
910  /// \brief The current expression occurs within an unevaluated
911  /// operand that unconditionally permits abstract references to
912  /// fields, such as a SIZE operator in MS-style inline assembly.
913  UnevaluatedAbstract,
914 
915  /// \brief The current context is "potentially evaluated" in C++11 terms,
916  /// but the expression is evaluated at compile-time (like the values of
917  /// cases in a switch statement).
918  ConstantEvaluated,
919 
920  /// \brief The current expression is potentially evaluated at run time,
921  /// which means that code may be generated to evaluate the value of the
922  /// expression at run time.
923  PotentiallyEvaluated,
924 
925  /// \brief The current expression is potentially evaluated, but any
926  /// declarations referenced inside that expression are only used if
927  /// in fact the current expression is used.
928  ///
929  /// This value is used when parsing default function arguments, for which
930  /// we would like to provide diagnostics (e.g., passing non-POD arguments
931  /// through varargs) but do not want to mark declarations as "referenced"
932  /// until the default argument is used.
933  PotentiallyEvaluatedIfUsed
934  };
935 
936  /// \brief Data structure used to record current or nested
937  /// expression evaluation contexts.
939  /// \brief The expression evaluation context.
941 
942  /// \brief Whether the enclosing context needed a cleanup.
944 
945  /// \brief Whether we are in a decltype expression.
947 
948  /// \brief The number of active cleanup objects when we entered
949  /// this expression evaluation context.
951 
952  /// \brief The number of typos encountered during this expression evaluation
953  /// context (i.e. the number of TypoExprs created).
954  unsigned NumTypos;
955 
956  llvm::SmallPtrSet<Expr*, 2> SavedMaybeODRUseExprs;
957 
958  /// \brief The lambdas that are present within this context, if it
959  /// is indeed an unevaluated context.
961 
962  /// \brief The declaration that provides context for lambda expressions
963  /// and block literals if the normal declaration context does not
964  /// suffice, e.g., in a default function argument.
966 
967  /// \brief The context information used to mangle lambda expressions
968  /// and block literals within this context.
969  ///
970  /// This mangling information is allocated lazily, since most contexts
971  /// do not have lambda expressions or block literals.
972  std::unique_ptr<MangleNumberingContext> MangleNumbering;
973 
974  /// \brief If we are processing a decltype type, a set of call expressions
975  /// for which we have deferred checking the completeness of the return type.
977 
978  /// \brief If we are processing a decltype type, a set of temporary binding
979  /// expressions for which we have deferred checking the destructor.
981 
983  unsigned NumCleanupObjects,
984  CleanupInfo ParentCleanup,
985  Decl *ManglingContextDecl,
986  bool IsDecltype)
987  : Context(Context), ParentCleanup(ParentCleanup),
988  IsDecltype(IsDecltype), NumCleanupObjects(NumCleanupObjects),
989  NumTypos(0),
990  ManglingContextDecl(ManglingContextDecl), MangleNumbering() { }
991 
992  /// \brief Retrieve the mangling numbering context, used to consistently
993  /// number constructs like lambdas for mangling.
994  MangleNumberingContext &getMangleNumberingContext(ASTContext &Ctx);
995 
996  bool isUnevaluated() const {
997  return Context == ExpressionEvaluationContext::Unevaluated ||
998  Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
999  Context == ExpressionEvaluationContext::UnevaluatedList;
1000  }
1001  bool isConstantEvaluated() const {
1002  return Context == ExpressionEvaluationContext::ConstantEvaluated;
1003  }
1004  };
1005 
1006  /// A stack of expression evaluation contexts.
1008 
1009  /// \brief Compute the mangling number context for a lambda expression or
1010  /// block literal.
1011  ///
1012  /// \param DC - The DeclContext containing the lambda expression or
1013  /// block literal.
1014  /// \param[out] ManglingContextDecl - Returns the ManglingContextDecl
1015  /// associated with the context, if relevant.
1016  MangleNumberingContext *getCurrentMangleNumberContext(
1017  const DeclContext *DC,
1018  Decl *&ManglingContextDecl);
1019 
1020 
1021  /// SpecialMemberOverloadResult - The overloading result for a special member
1022  /// function.
1023  ///
1024  /// This is basically a wrapper around PointerIntPair. The lowest bits of the
1025  /// integer are used to determine whether overload resolution succeeded.
1027  public:
1028  enum Kind {
1031  Success
1032  };
1033 
1034  private:
1035  llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
1036 
1037  public:
1040  : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}
1041 
1042  CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
1043  void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
1044 
1045  Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
1046  void setKind(Kind K) { Pair.setInt(K); }
1047  };
1048 
1050  : public llvm::FastFoldingSetNode,
1052  public:
1053  SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
1054  : FastFoldingSetNode(ID)
1055  {}
1056  };
1057 
1058  /// \brief A cache of special member function overload resolution results
1059  /// for C++ records.
1060  llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;
1061 
1062  /// \brief A cache of the flags available in enumerations with the flag_bits
1063  /// attribute.
1064  mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;
1065 
1066  /// \brief The kind of translation unit we are processing.
1067  ///
1068  /// When we're processing a complete translation unit, Sema will perform
1069  /// end-of-translation-unit semantic tasks (such as creating
1070  /// initializers for tentative definitions in C) once parsing has
1071  /// completed. Modules and precompiled headers perform different kinds of
1072  /// checks.
1074 
1075  llvm::BumpPtrAllocator BumpAlloc;
1076 
1077  /// \brief The number of SFINAE diagnostics that have been trapped.
1079 
1080  typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
1082 
1083  /// \brief A mapping from parameters with unparsed default arguments to the
1084  /// set of instantiations of each parameter.
1085  ///
1086  /// This mapping is a temporary data structure used when parsing
1087  /// nested class templates or nested classes of class templates,
1088  /// where we might end up instantiating an inner class before the
1089  /// default arguments of its methods have been parsed.
1091 
1092  // Contains the locations of the beginning of unparsed default
1093  // argument locations.
1094  llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;
1095 
1096  /// UndefinedInternals - all the used, undefined objects which require a
1097  /// definition in this translation unit.
1098  llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;
1099 
1100  /// Determine if VD, which must be a variable or function, is an external
1101  /// symbol that nonetheless can't be referenced from outside this translation
1102  /// unit because its type has no linkage and it's not extern "C".
1103  bool isExternalWithNoLinkageType(ValueDecl *VD);
1104 
1105  /// Obtain a sorted list of functions that are undefined but ODR-used.
1106  void getUndefinedButUsed(
1107  SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);
1108 
1109  /// Retrieves list of suspicious delete-expressions that will be checked at
1110  /// the end of translation unit.
1111  const llvm::MapVector<FieldDecl *, DeleteLocs> &
1112  getMismatchingDeleteExpressions() const;
1113 
1114  typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
1115  typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
1116 
1117  /// Method Pool - allows efficient lookup when typechecking messages to "id".
1118  /// We need to maintain a list, since selectors can have differing signatures
1119  /// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
1120  /// of selectors are "overloaded").
1121  /// At the head of the list it is recorded whether there were 0, 1, or >= 2
1122  /// methods inside categories with a particular selector.
1123  GlobalMethodPool MethodPool;
1124 
1125  /// Method selectors used in a \@selector expression. Used for implementation
1126  /// of -Wselector.
1127  llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;
1128 
1129  /// Kinds of C++ special members.
1137  CXXInvalid
1138  };
1139 
1140  typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
1142 
1143  /// The C++ special members which we are currently in the process of
1144  /// declaring. If this process recursively triggers the declaration of the
1145  /// same special member, we should act as if it is not yet declared.
1146  llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;
1147 
1148  /// The function definitions which were renamed as part of typo-correction
1149  /// to match their respective declarations. We want to keep track of them
1150  /// to ensure that we don't emit a "redefinition" error if we encounter a
1151  /// correctly named definition after the renamed definition.
1152  llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;
1153 
1154  /// Stack of types that correspond to the parameter entities that are
1155  /// currently being copy-initialized. Can be empty.
1157 
1158  void ReadMethodPool(Selector Sel);
1159  void updateOutOfDateSelector(Selector Sel);
1160 
1161  /// Private Helper predicate to check for 'self'.
1162  bool isSelfExpr(Expr *RExpr);
1163  bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);
1164 
1165  /// \brief Cause the active diagnostic on the DiagosticsEngine to be
1166  /// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
1167  /// should not be used elsewhere.
1168  void EmitCurrentDiagnostic(unsigned DiagID);
1169 
1170  /// Records and restores the FP_CONTRACT state on entry/exit of compound
1171  /// statements.
1173  public:
1174  FPContractStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
1175  ~FPContractStateRAII() { S.FPFeatures = OldFPFeaturesState; }
1176 
1177  private:
1178  Sema& S;
1179  FPOptions OldFPFeaturesState;
1180  };
1181 
1182  void addImplicitTypedef(StringRef Name, QualType T);
1183 
1184 public:
1185  Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
1187  CodeCompleteConsumer *CompletionConsumer = nullptr);
1188  ~Sema();
1189 
1190  /// \brief Perform initialization that occurs after the parser has been
1191  /// initialized but before it parses anything.
1192  void Initialize();
1193 
1194  const LangOptions &getLangOpts() const { return LangOpts; }
1195  OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
1196  FPOptions &getFPOptions() { return FPFeatures; }
1197 
1198  DiagnosticsEngine &getDiagnostics() const { return Diags; }
1199  SourceManager &getSourceManager() const { return SourceMgr; }
1200  Preprocessor &getPreprocessor() const { return PP; }
1201  ASTContext &getASTContext() const { return Context; }
1202  ASTConsumer &getASTConsumer() const { return Consumer; }
1203  ASTMutationListener *getASTMutationListener() const;
1204  ExternalSemaSource* getExternalSource() const { return ExternalSource; }
1205 
1206  ///\brief Registers an external source. If an external source already exists,
1207  /// creates a multiplex external source and appends to it.
1208  ///
1209  ///\param[in] E - A non-null external sema source.
1210  ///
1211  void addExternalSource(ExternalSemaSource *E);
1212 
1213  void PrintStats() const;
1214 
1215  /// \brief Helper class that creates diagnostics with optional
1216  /// template instantiation stacks.
1217  ///
1218  /// This class provides a wrapper around the basic DiagnosticBuilder
1219  /// class that emits diagnostics. SemaDiagnosticBuilder is
1220  /// responsible for emitting the diagnostic (as DiagnosticBuilder
1221  /// does) and, if the diagnostic comes from inside a template
1222  /// instantiation, printing the template instantiation stack as
1223  /// well.
1225  Sema &SemaRef;
1226  unsigned DiagID;
1227 
1228  public:
1229  SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
1230  : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }
1231 
1232  // This is a cunning lie. DiagnosticBuilder actually performs move
1233  // construction in its copy constructor (but due to varied uses, it's not
1234  // possible to conveniently express this as actual move construction). So
1235  // the default copy ctor here is fine, because the base class disables the
1236  // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
1237  // in that case anwyay.
1238  SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;
1239 
1241  // If we aren't active, there is nothing to do.
1242  if (!isActive()) return;
1243 
1244  // Otherwise, we need to emit the diagnostic. First flush the underlying
1245  // DiagnosticBuilder data, and clear the diagnostic builder itself so it
1246  // won't emit the diagnostic in its own destructor.
1247  //
1248  // This seems wasteful, in that as written the DiagnosticBuilder dtor will
1249  // do its own needless checks to see if the diagnostic needs to be
1250  // emitted. However, because we take care to ensure that the builder
1251  // objects never escape, a sufficiently smart compiler will be able to
1252  // eliminate that code.
1253  FlushCounts();
1254  Clear();
1255 
1256  // Dispatch to Sema to emit the diagnostic.
1257  SemaRef.EmitCurrentDiagnostic(DiagID);
1258  }
1259 
1260  /// Teach operator<< to produce an object of the correct type.
1261  template<typename T>
1263  const SemaDiagnosticBuilder &Diag, const T &Value) {
1264  const DiagnosticBuilder &BaseDiag = Diag;
1265  BaseDiag << Value;
1266  return Diag;
1267  }
1268  };
1269 
1270  /// \brief Emit a diagnostic.
1272  DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
1273  return SemaDiagnosticBuilder(DB, *this, DiagID);
1274  }
1275 
1276  /// \brief Emit a partial diagnostic.
1278 
1279  /// \brief Build a partial diagnostic.
1280  PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
1281 
1282  bool findMacroSpelling(SourceLocation &loc, StringRef name);
1283 
1284  /// \brief Get a string to suggest for zero-initialization of a type.
1285  std::string
1286  getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
1287  std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;
1288 
1289  /// \brief Calls \c Lexer::getLocForEndOfToken()
1290  SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);
1291 
1292  /// \brief Retrieve the module loader associated with the preprocessor.
1293  ModuleLoader &getModuleLoader() const;
1294 
1295  void emitAndClearUnusedLocalTypedefWarnings();
1296 
1297  void ActOnStartOfTranslationUnit();
1298  void ActOnEndOfTranslationUnit();
1299 
1300  void CheckDelegatingCtorCycles();
1301 
1302  Scope *getScopeForContext(DeclContext *Ctx);
1303 
1304  void PushFunctionScope();
1305  void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
1306  sema::LambdaScopeInfo *PushLambdaScope();
1307 
1308  /// \brief This is used to inform Sema what the current TemplateParameterDepth
1309  /// is during Parsing. Currently it is used to pass on the depth
1310  /// when parsing generic lambda 'auto' parameters.
1311  void RecordParsingTemplateParameterDepth(unsigned Depth);
1312 
1313  void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
1314  RecordDecl *RD,
1315  CapturedRegionKind K);
1316  void
1317  PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
1318  const Decl *D = nullptr,
1319  const BlockExpr *blkExpr = nullptr);
1320 
1322  return FunctionScopes.back();
1323  }
1324 
1326  if (FunctionScopes.empty())
1327  return nullptr;
1328 
1329  for (int e = FunctionScopes.size()-1; e >= 0; --e) {
1330  if (isa<sema::BlockScopeInfo>(FunctionScopes[e]))
1331  continue;
1332  return FunctionScopes[e];
1333  }
1334  return nullptr;
1335  }
1336 
1337  template <typename ExprT>
1338  void recordUseOfEvaluatedWeak(const ExprT *E, bool IsRead=true) {
1339  if (!isUnevaluatedContext())
1340  getCurFunction()->recordUseOfWeak(E, IsRead);
1341  }
1342 
1343  void PushCompoundScope(bool IsStmtExpr);
1344  void PopCompoundScope();
1345 
1346  sema::CompoundScopeInfo &getCurCompoundScope() const;
1347 
1348  bool hasAnyUnrecoverableErrorsInThisFunction() const;
1349 
1350  /// \brief Retrieve the current block, if any.
1351  sema::BlockScopeInfo *getCurBlock();
1352 
1353  /// Retrieve the current lambda scope info, if any.
1354  /// \param IgnoreNonLambdaCapturingScope true if should find the top-most
1355  /// lambda scope info ignoring all inner capturing scopes that are not
1356  /// lambda scopes.
1358  getCurLambda(bool IgnoreNonLambdaCapturingScope = false);
1359 
1360  /// \brief Retrieve the current generic lambda info, if any.
1361  sema::LambdaScopeInfo *getCurGenericLambda();
1362 
1363  /// \brief Retrieve the current captured region, if any.
1364  sema::CapturedRegionScopeInfo *getCurCapturedRegion();
1365 
1366  /// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
1367  SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
1368 
1369  void ActOnComment(SourceRange Comment);
1370 
1371  //===--------------------------------------------------------------------===//
1372  // Type Analysis / Processing: SemaType.cpp.
1373  //
1374 
1375  QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
1376  const DeclSpec *DS = nullptr);
1377  QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
1378  const DeclSpec *DS = nullptr);
1379  QualType BuildPointerType(QualType T,
1380  SourceLocation Loc, DeclarationName Entity);
1381  QualType BuildReferenceType(QualType T, bool LValueRef,
1382  SourceLocation Loc, DeclarationName Entity);
1383  QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1384  Expr *ArraySize, unsigned Quals,
1385  SourceRange Brackets, DeclarationName Entity);
1386  QualType BuildExtVectorType(QualType T, Expr *ArraySize,
1387  SourceLocation AttrLoc);
1388  QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
1389  SourceLocation AttrLoc);
1390 
1391  bool CheckFunctionReturnType(QualType T, SourceLocation Loc);
1392 
1393  /// \brief Build a function type.
1394  ///
1395  /// This routine checks the function type according to C++ rules and
1396  /// under the assumption that the result type and parameter types have
1397  /// just been instantiated from a template. It therefore duplicates
1398  /// some of the behavior of GetTypeForDeclarator, but in a much
1399  /// simpler form that is only suitable for this narrow use case.
1400  ///
1401  /// \param T The return type of the function.
1402  ///
1403  /// \param ParamTypes The parameter types of the function. This array
1404  /// will be modified to account for adjustments to the types of the
1405  /// function parameters.
1406  ///
1407  /// \param Loc The location of the entity whose type involves this
1408  /// function type or, if there is no such entity, the location of the
1409  /// type that will have function type.
1410  ///
1411  /// \param Entity The name of the entity that involves the function
1412  /// type, if known.
1413  ///
1414  /// \param EPI Extra information about the function type. Usually this will
1415  /// be taken from an existing function with the same prototype.
1416  ///
1417  /// \returns A suitable function type, if there are no errors. The
1418  /// unqualified type will always be a FunctionProtoType.
1419  /// Otherwise, returns a NULL type.
1420  QualType BuildFunctionType(QualType T,
1421  MutableArrayRef<QualType> ParamTypes,
1422  SourceLocation Loc, DeclarationName Entity,
1423  const FunctionProtoType::ExtProtoInfo &EPI);
1424 
1425  QualType BuildMemberPointerType(QualType T, QualType Class,
1426  SourceLocation Loc,
1427  DeclarationName Entity);
1428  QualType BuildBlockPointerType(QualType T,
1429  SourceLocation Loc, DeclarationName Entity);
1430  QualType BuildParenType(QualType T);
1431  QualType BuildAtomicType(QualType T, SourceLocation Loc);
1432  QualType BuildReadPipeType(QualType T,
1433  SourceLocation Loc);
1434  QualType BuildWritePipeType(QualType T,
1435  SourceLocation Loc);
1436 
1437  TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
1438  TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
1439  TypeSourceInfo *GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
1440  TypeSourceInfo *ReturnTypeInfo);
1441 
1442  /// \brief Package the given type and TSI into a ParsedType.
1443  ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
1444  DeclarationNameInfo GetNameForDeclarator(Declarator &D);
1445  DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
1446  static QualType GetTypeFromParser(ParsedType Ty,
1447  TypeSourceInfo **TInfo = nullptr);
1448  CanThrowResult canThrow(const Expr *E);
1449  const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
1450  const FunctionProtoType *FPT);
1451  void UpdateExceptionSpec(FunctionDecl *FD,
1453  bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
1454  bool CheckDistantExceptionSpec(QualType T);
1455  bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
1456  bool CheckEquivalentExceptionSpec(
1457  const FunctionProtoType *Old, SourceLocation OldLoc,
1458  const FunctionProtoType *New, SourceLocation NewLoc);
1459  bool CheckEquivalentExceptionSpec(
1460  const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
1461  const FunctionProtoType *Old, SourceLocation OldLoc,
1462  const FunctionProtoType *New, SourceLocation NewLoc);
1463  bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
1464  bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
1465  const PartialDiagnostic &NestedDiagID,
1466  const PartialDiagnostic &NoteID,
1467  const FunctionProtoType *Superset,
1468  SourceLocation SuperLoc,
1469  const FunctionProtoType *Subset,
1470  SourceLocation SubLoc);
1471  bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
1472  const PartialDiagnostic &NoteID,
1473  const FunctionProtoType *Target,
1474  SourceLocation TargetLoc,
1475  const FunctionProtoType *Source,
1476  SourceLocation SourceLoc);
1477 
1478  TypeResult ActOnTypeName(Scope *S, Declarator &D);
1479 
1480  /// \brief The parser has parsed the context-sensitive type 'instancetype'
1481  /// in an Objective-C message declaration. Return the appropriate type.
1482  ParsedType ActOnObjCInstanceType(SourceLocation Loc);
1483 
1484  /// \brief Abstract class used to diagnose incomplete types.
1485  struct TypeDiagnoser {
1487 
1488  virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
1489  virtual ~TypeDiagnoser() {}
1490  };
1491 
1492  static int getPrintable(int I) { return I; }
1493  static unsigned getPrintable(unsigned I) { return I; }
1494  static bool getPrintable(bool B) { return B; }
1495  static const char * getPrintable(const char *S) { return S; }
1496  static StringRef getPrintable(StringRef S) { return S; }
1497  static const std::string &getPrintable(const std::string &S) { return S; }
1498  static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
1499  return II;
1500  }
1502  static QualType getPrintable(QualType T) { return T; }
1503  static SourceRange getPrintable(SourceRange R) { return R; }
1504  static SourceRange getPrintable(SourceLocation L) { return L; }
1505  static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
1506  static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}
1507 
1508  template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
1509  unsigned DiagID;
1510  std::tuple<const Ts &...> Args;
1511 
1512  template <std::size_t... Is>
1513  void emit(const SemaDiagnosticBuilder &DB,
1514  llvm::index_sequence<Is...>) const {
1515  // Apply all tuple elements to the builder in order.
1516  bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
1517  (void)Dummy;
1518  }
1519 
1520  public:
1521  BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
1522  : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
1523  assert(DiagID != 0 && "no diagnostic for type diagnoser");
1524  }
1525 
1526  void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
1527  const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
1528  emit(DB, llvm::index_sequence_for<Ts...>());
1529  DB << T;
1530  }
1531  };
1532 
1533 private:
1534  bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
1535  TypeDiagnoser *Diagnoser);
1536 
1537  struct ModuleScope {
1538  clang::Module *Module = nullptr;
1539  bool ModuleInterface = false;
1540  VisibleModuleSet OuterVisibleModules;
1541  };
1542  /// The modules we're currently parsing.
1544 
1545  /// Get the module whose scope we are currently within.
1546  Module *getCurrentModule() const {
1547  return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
1548  }
1549 
1550  VisibleModuleSet VisibleModules;
1551 
1552 public:
1553  /// \brief Get the module owning an entity.
1554  Module *getOwningModule(Decl *Entity) { return Entity->getOwningModule(); }
1555 
1556  /// \brief Make a merged definition of an existing hidden definition \p ND
1557  /// visible at the specified location.
1558  void makeMergedDefinitionVisible(NamedDecl *ND);
1559 
1560  bool isModuleVisible(const Module *M) { return VisibleModules.isVisible(M); }
1561 
1562  /// Determine whether a declaration is visible to name lookup.
1563  bool isVisible(const NamedDecl *D) {
1564  return !D->isHidden() || isVisibleSlow(D);
1565  }
1566 
1567  /// Determine whether any declaration of an entity is visible.
1568  bool
1570  llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
1571  return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
1572  }
1573  bool hasVisibleDeclarationSlow(const NamedDecl *D,
1575 
1576  bool hasVisibleMergedDefinition(NamedDecl *Def);
1577  bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);
1578 
1579  /// Determine if \p D and \p Suggested have a structurally compatible
1580  /// layout as described in C11 6.2.7/1.
1581  bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);
1582 
1583  /// Determine if \p D has a visible definition. If not, suggest a declaration
1584  /// that should be made visible to expose the definition.
1585  bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
1586  bool OnlyNeedComplete = false);
1588  NamedDecl *Hidden;
1589  return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
1590  }
1591 
1592  /// Determine if the template parameter \p D has a visible default argument.
1593  bool
1595  llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1596 
1597  /// Determine if there is a visible declaration of \p D that is an explicit
1598  /// specialization declaration for a specialization of a template. (For a
1599  /// member specialization, use hasVisibleMemberSpecialization.)
1600  bool hasVisibleExplicitSpecialization(
1601  const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1602 
1603  /// Determine if there is a visible declaration of \p D that is a member
1604  /// specialization declaration (as opposed to an instantiated declaration).
1605  bool hasVisibleMemberSpecialization(
1606  const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1607 
1608  /// Determine if \p A and \p B are equivalent internal linkage declarations
1609  /// from different modules, and thus an ambiguity error can be downgraded to
1610  /// an extension warning.
1611  bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
1612  const NamedDecl *B);
1613  void diagnoseEquivalentInternalLinkageDeclarations(
1614  SourceLocation Loc, const NamedDecl *D,
1616 
1618  return !RequireCompleteTypeImpl(Loc, T, nullptr);
1619  }
1620  bool RequireCompleteType(SourceLocation Loc, QualType T,
1621  TypeDiagnoser &Diagnoser);
1622  bool RequireCompleteType(SourceLocation Loc, QualType T,
1623  unsigned DiagID);
1624 
1625  template <typename... Ts>
1626  bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
1627  const Ts &...Args) {
1628  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1629  return RequireCompleteType(Loc, T, Diagnoser);
1630  }
1631 
1632  void completeExprArrayBound(Expr *E);
1633  bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
1634  bool RequireCompleteExprType(Expr *E, unsigned DiagID);
1635 
1636  template <typename... Ts>
1637  bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
1638  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1639  return RequireCompleteExprType(E, Diagnoser);
1640  }
1641 
1642  bool RequireLiteralType(SourceLocation Loc, QualType T,
1643  TypeDiagnoser &Diagnoser);
1644  bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);
1645 
1646  template <typename... Ts>
1647  bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
1648  const Ts &...Args) {
1649  BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1650  return RequireLiteralType(Loc, T, Diagnoser);
1651  }
1652 
1653  QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
1654  const CXXScopeSpec &SS, QualType T);
1655 
1656  QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
1657  /// If AsUnevaluated is false, E is treated as though it were an evaluated
1658  /// context, such as when building a type for decltype(auto).
1659  QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
1660  bool AsUnevaluated = true);
1661  QualType BuildUnaryTransformType(QualType BaseType,
1663  SourceLocation Loc);
1664 
1665  //===--------------------------------------------------------------------===//
1666  // Symbol table / Decl tracking callbacks: SemaDecl.cpp.
1667  //
1668 
1669  struct SkipBodyInfo {
1671  : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
1672  New(nullptr) {}
1677  };
1678 
1679  DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);
1680 
1681  void DiagnoseUseOfUnimplementedSelectors();
1682 
1683  bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;
1684 
1686  Scope *S, CXXScopeSpec *SS = nullptr,
1687  bool isClassName = false, bool HasTrailingDot = false,
1688  ParsedType ObjectType = nullptr,
1689  bool IsCtorOrDtorName = false,
1690  bool WantNontrivialTypeSourceInfo = false,
1691  bool IsClassTemplateDeductionContext = true,
1692  IdentifierInfo **CorrectedII = nullptr);
1693  TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
1694  bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
1695  void DiagnoseUnknownTypeName(IdentifierInfo *&II,
1696  SourceLocation IILoc,
1697  Scope *S,
1698  CXXScopeSpec *SS,
1699  ParsedType &SuggestedType,
1700  bool IsTemplateName = false);
1701 
1702  /// Attempt to behave like MSVC in situations where lookup of an unqualified
1703  /// type name has failed in a dependent context. In these situations, we
1704  /// automatically form a DependentTypeName that will retry lookup in a related
1705  /// scope during instantiation.
1706  ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
1707  SourceLocation NameLoc,
1708  bool IsTemplateTypeArg);
1709 
1710  /// \brief Describes the result of the name lookup and resolution performed
1711  /// by \c ClassifyName().
1721  NC_FunctionTemplate
1722  };
1723 
1726  ExprResult Expr;
1727  TemplateName Template;
1728  ParsedType Type;
1729 
1730  explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}
1731 
1732  public:
1733  NameClassification(ExprResult Expr) : Kind(NC_Expression), Expr(Expr) {}
1734 
1735  NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}
1736 
1737  NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}
1738 
1740  return NameClassification(NC_Error);
1741  }
1742 
1744  return NameClassification(NC_Unknown);
1745  }
1746 
1748  return NameClassification(NC_NestedNameSpecifier);
1749  }
1750 
1752  NameClassification Result(NC_TypeTemplate);
1753  Result.Template = Name;
1754  return Result;
1755  }
1756 
1758  NameClassification Result(NC_VarTemplate);
1759  Result.Template = Name;
1760  return Result;
1761  }
1762 
1764  NameClassification Result(NC_FunctionTemplate);
1765  Result.Template = Name;
1766  return Result;
1767  }
1768 
1770 
1772  assert(Kind == NC_Type);
1773  return Type;
1774  }
1775 
1777  assert(Kind == NC_Expression);
1778  return Expr;
1779  }
1780 
1782  assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||
1783  Kind == NC_VarTemplate);
1784  return Template;
1785  }
1786 
1788  switch (Kind) {
1789  case NC_TypeTemplate:
1790  return TNK_Type_template;
1791  case NC_FunctionTemplate:
1792  return TNK_Function_template;
1793  case NC_VarTemplate:
1794  return TNK_Var_template;
1795  default:
1796  llvm_unreachable("unsupported name classification.");
1797  }
1798  }
1799  };
1800 
1801  /// \brief Perform name lookup on the given name, classifying it based on
1802  /// the results of name lookup and the following token.
1803  ///
1804  /// This routine is used by the parser to resolve identifiers and help direct
1805  /// parsing. When the identifier cannot be found, this routine will attempt
1806  /// to correct the typo and classify based on the resulting name.
1807  ///
1808  /// \param S The scope in which we're performing name lookup.
1809  ///
1810  /// \param SS The nested-name-specifier that precedes the name.
1811  ///
1812  /// \param Name The identifier. If typo correction finds an alternative name,
1813  /// this pointer parameter will be updated accordingly.
1814  ///
1815  /// \param NameLoc The location of the identifier.
1816  ///
1817  /// \param NextToken The token following the identifier. Used to help
1818  /// disambiguate the name.
1819  ///
1820  /// \param IsAddressOfOperand True if this name is the operand of a unary
1821  /// address of ('&') expression, assuming it is classified as an
1822  /// expression.
1823  ///
1824  /// \param CCC The correction callback, if typo correction is desired.
1826  ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name,
1827  SourceLocation NameLoc, const Token &NextToken,
1828  bool IsAddressOfOperand,
1829  std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr);
1830 
1831  /// Describes the detailed kind of a template name. Used in diagnostics.
1833  ClassTemplate,
1834  FunctionTemplate,
1835  VarTemplate,
1836  AliasTemplate,
1837  TemplateTemplateParam,
1838  DependentTemplate
1839  };
1841  getTemplateNameKindForDiagnostics(TemplateName Name);
1842 
1843  /// Determine whether it's plausible that E was intended to be a
1844  /// template-name.
1846  if (!getLangOpts().CPlusPlus || E.isInvalid())
1847  return false;
1848  if (auto *DRE = dyn_cast<DeclRefExpr>(E.get()))
1849  return !DRE->hasExplicitTemplateArgs();
1850  if (auto *ME = dyn_cast<MemberExpr>(E.get()))
1851  return !ME->hasExplicitTemplateArgs();
1852  // Any additional cases recognized here should also be handled by
1853  // diagnoseExprIntendedAsTemplateName.
1854  return false;
1855  }
1856  void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
1857  SourceLocation Less,
1858  SourceLocation Greater);
1859 
1860  Decl *ActOnDeclarator(Scope *S, Declarator &D);
1861 
1862  NamedDecl *HandleDeclarator(Scope *S, Declarator &D,
1863  MultiTemplateParamsArg TemplateParameterLists);
1864  void RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S);
1865  bool DiagnoseClassNameShadow(DeclContext *DC, DeclarationNameInfo Info);
1866  bool diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
1867  DeclarationName Name,
1868  SourceLocation Loc);
1869  void
1870  diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
1871  SourceLocation FallbackLoc,
1872  SourceLocation ConstQualLoc = SourceLocation(),
1873  SourceLocation VolatileQualLoc = SourceLocation(),
1874  SourceLocation RestrictQualLoc = SourceLocation(),
1875  SourceLocation AtomicQualLoc = SourceLocation(),
1876  SourceLocation UnalignedQualLoc = SourceLocation());
1877 
1878  static bool adjustContextForLocalExternDecl(DeclContext *&DC);
1879  void DiagnoseFunctionSpecifiers(const DeclSpec &DS);
1880  NamedDecl *getShadowedDeclaration(const TypedefNameDecl *D,
1881  const LookupResult &R);
1882  NamedDecl *getShadowedDeclaration(const VarDecl *D, const LookupResult &R);
1883  void CheckShadow(NamedDecl *D, NamedDecl *ShadowedDecl,
1884  const LookupResult &R);
1885  void CheckShadow(Scope *S, VarDecl *D);
1886 
1887  /// Warn if 'E', which is an expression that is about to be modified, refers
1888  /// to a shadowing declaration.
1889  void CheckShadowingDeclModification(Expr *E, SourceLocation Loc);
1890 
1891  void DiagnoseShadowingLambdaDecls(const sema::LambdaScopeInfo *LSI);
1892 
1893 private:
1894  /// Map of current shadowing declarations to shadowed declarations. Warn if
1895  /// it looks like the user is trying to modify the shadowing declaration.
1896  llvm::DenseMap<const NamedDecl *, const NamedDecl *> ShadowingDecls;
1897 
1898 public:
1899  void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange);
1900  void handleTagNumbering(const TagDecl *Tag, Scope *TagScope);
1901  void setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
1902  TypedefNameDecl *NewTD);
1903  void CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *D);
1904  NamedDecl* ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1905  TypeSourceInfo *TInfo,
1907  NamedDecl* ActOnTypedefNameDecl(Scope* S, DeclContext* DC, TypedefNameDecl *D,
1908  LookupResult &Previous, bool &Redeclaration);
1909  NamedDecl *ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
1910  TypeSourceInfo *TInfo,
1911  LookupResult &Previous,
1912  MultiTemplateParamsArg TemplateParamLists,
1913  bool &AddToScope,
1914  ArrayRef<BindingDecl *> Bindings = None);
1915  NamedDecl *
1916  ActOnDecompositionDeclarator(Scope *S, Declarator &D,
1917  MultiTemplateParamsArg TemplateParamLists);
1918  // Returns true if the variable declaration is a redeclaration
1919  bool CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous);
1920  void CheckVariableDeclarationType(VarDecl *NewVD);
1921  bool DeduceVariableDeclarationType(VarDecl *VDecl, bool DirectInit,
1922  Expr *Init);
1923  void CheckCompleteVariableDeclaration(VarDecl *VD);
1924  void CheckCompleteDecompositionDeclaration(DecompositionDecl *DD);
1925  void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D);
1926 
1927  NamedDecl* ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
1928  TypeSourceInfo *TInfo,
1929  LookupResult &Previous,
1930  MultiTemplateParamsArg TemplateParamLists,
1931  bool &AddToScope);
1932  bool AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD);
1933 
1934  bool CheckConstexprFunctionDecl(const FunctionDecl *FD);
1935  bool CheckConstexprFunctionBody(const FunctionDecl *FD, Stmt *Body);
1936 
1937  void DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD);
1938  void FindHiddenVirtualMethods(CXXMethodDecl *MD,
1939  SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
1940  void NoteHiddenVirtualMethods(CXXMethodDecl *MD,
1941  SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods);
1942  // Returns true if the function declaration is a redeclaration
1943  bool CheckFunctionDeclaration(Scope *S,
1944  FunctionDecl *NewFD, LookupResult &Previous,
1945  bool IsMemberSpecialization);
1946  bool shouldLinkDependentDeclWithPrevious(Decl *D, Decl *OldDecl);
1947  void CheckMain(FunctionDecl *FD, const DeclSpec &D);
1948  void CheckMSVCRTEntryPoint(FunctionDecl *FD);
1949  Decl *ActOnParamDeclarator(Scope *S, Declarator &D);
1950  ParmVarDecl *BuildParmVarDeclForTypedef(DeclContext *DC,
1951  SourceLocation Loc,
1952  QualType T);
1953  ParmVarDecl *CheckParameter(DeclContext *DC, SourceLocation StartLoc,
1954  SourceLocation NameLoc, IdentifierInfo *Name,
1955  QualType T, TypeSourceInfo *TSInfo,
1956  StorageClass SC);
1957  void ActOnParamDefaultArgument(Decl *param,
1958  SourceLocation EqualLoc,
1959  Expr *defarg);
1960  void ActOnParamUnparsedDefaultArgument(Decl *param,
1961  SourceLocation EqualLoc,
1962  SourceLocation ArgLoc);
1963  void ActOnParamDefaultArgumentError(Decl *param, SourceLocation EqualLoc);
1964  bool SetParamDefaultArgument(ParmVarDecl *Param, Expr *DefaultArg,
1965  SourceLocation EqualLoc);
1966 
1967  void AddInitializerToDecl(Decl *dcl, Expr *init, bool DirectInit);
1968  void ActOnUninitializedDecl(Decl *dcl);
1969  void ActOnInitializerError(Decl *Dcl);
1970 
1971  void ActOnPureSpecifier(Decl *D, SourceLocation PureSpecLoc);
1972  void ActOnCXXForRangeDecl(Decl *D);
1973  StmtResult ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
1974  IdentifierInfo *Ident,
1975  ParsedAttributes &Attrs,
1976  SourceLocation AttrEnd);
1977  void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc);
1978  void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc);
1979  void FinalizeDeclaration(Decl *D);
1980  DeclGroupPtrTy FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
1981  ArrayRef<Decl *> Group);
1982  DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef<Decl *> Group);
1983 
1984  /// Should be called on all declarations that might have attached
1985  /// documentation comments.
1986  void ActOnDocumentableDecl(Decl *D);
1987  void ActOnDocumentableDecls(ArrayRef<Decl *> Group);
1988 
1989  void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
1990  SourceLocation LocAfterDecls);
1991  void CheckForFunctionRedefinition(
1992  FunctionDecl *FD, const FunctionDecl *EffectiveDefinition = nullptr,
1993  SkipBodyInfo *SkipBody = nullptr);
1994  Decl *ActOnStartOfFunctionDef(Scope *S, Declarator &D,
1995  MultiTemplateParamsArg TemplateParamLists,
1996  SkipBodyInfo *SkipBody = nullptr);
1997  Decl *ActOnStartOfFunctionDef(Scope *S, Decl *D,
1998  SkipBodyInfo *SkipBody = nullptr);
1999  void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
2001  return D && isa<ObjCMethodDecl>(D);
2002  }
2003 
2004  /// \brief Determine whether we can delay parsing the body of a function or
2005  /// function template until it is used, assuming we don't care about emitting
2006  /// code for that function.
2007  ///
2008  /// This will be \c false if we may need the body of the function in the
2009  /// middle of parsing an expression (where it's impractical to switch to
2010  /// parsing a different function), for instance, if it's constexpr in C++11
2011  /// or has an 'auto' return type in C++14. These cases are essentially bugs.
2012  bool canDelayFunctionBody(const Declarator &D);
2013 
2014  /// \brief Determine whether we can skip parsing the body of a function
2015  /// definition, assuming we don't care about analyzing its body or emitting
2016  /// code for that function.
2017  ///
2018  /// This will be \c false only if we may need the body of the function in
2019  /// order to parse the rest of the program (for instance, if it is
2020  /// \c constexpr in C++11 or has an 'auto' return type in C++14).
2021  bool canSkipFunctionBody(Decl *D);
2022 
2023  void computeNRVO(Stmt *Body, sema::FunctionScopeInfo *Scope);
2024  Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body);
2025  Decl *ActOnFinishFunctionBody(Decl *Decl, Stmt *Body, bool IsInstantiation);
2026  Decl *ActOnSkippedFunctionBody(Decl *Decl);
2027  void ActOnFinishInlineFunctionDef(FunctionDecl *D);
2028 
2029  /// ActOnFinishDelayedAttribute - Invoked when we have finished parsing an
2030  /// attribute for which parsing is delayed.
2031  void ActOnFinishDelayedAttribute(Scope *S, Decl *D, ParsedAttributes &Attrs);
2032 
2033  /// \brief Diagnose any unused parameters in the given sequence of
2034  /// ParmVarDecl pointers.
2035  void DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters);
2036 
2037  /// \brief Diagnose whether the size of parameters or return value of a
2038  /// function or obj-c method definition is pass-by-value and larger than a
2039  /// specified threshold.
2040  void
2041  DiagnoseSizeOfParametersAndReturnValue(ArrayRef<ParmVarDecl *> Parameters,
2042  QualType ReturnTy, NamedDecl *D);
2043 
2044  void DiagnoseInvalidJumps(Stmt *Body);
2045  Decl *ActOnFileScopeAsmDecl(Expr *expr,
2046  SourceLocation AsmLoc,
2047  SourceLocation RParenLoc);
2048 
2049  /// \brief Handle a C++11 empty-declaration and attribute-declaration.
2050  Decl *ActOnEmptyDeclaration(Scope *S,
2051  AttributeList *AttrList,
2052  SourceLocation SemiLoc);
2053 
2054  enum class ModuleDeclKind {
2055  Interface, ///< 'export module X;'
2056  Implementation, ///< 'module X;'
2057  Partition, ///< 'module partition X;'
2058  };
2059 
2060  /// The parser has processed a module-declaration that begins the definition
2061  /// of a module interface or implementation.
2062  DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc,
2063  SourceLocation ModuleLoc, ModuleDeclKind MDK,
2064  ModuleIdPath Path);
2065 
2066  /// \brief The parser has processed a module import declaration.
2067  ///
2068  /// \param AtLoc The location of the '@' symbol, if any.
2069  ///
2070  /// \param ImportLoc The location of the 'import' keyword.
2071  ///
2072  /// \param Path The module access path.
2073  DeclResult ActOnModuleImport(SourceLocation AtLoc, SourceLocation ImportLoc,
2074  ModuleIdPath Path);
2075 
2076  /// \brief The parser has processed a module import translated from a
2077  /// #include or similar preprocessing directive.
2078  void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
2079  void BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod);
2080 
2081  /// \brief The parsed has entered a submodule.
2082  void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod);
2083  /// \brief The parser has left a submodule.
2084  void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod);
2085 
2086  /// \brief Create an implicit import of the given module at the given
2087  /// source location, for error recovery, if possible.
2088  ///
2089  /// This routine is typically used when an entity found by name lookup
2090  /// is actually hidden within a module that we know about but the user
2091  /// has forgotten to import.
2092  void createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
2093  Module *Mod);
2094 
2095  /// Kinds of missing import. Note, the values of these enumerators correspond
2096  /// to %select values in diagnostics.
2097  enum class MissingImportKind {
2098  Declaration,
2099  Definition,
2100  DefaultArgument,
2101  ExplicitSpecialization,
2102  PartialSpecialization
2103  };
2104 
2105  /// \brief Diagnose that the specified declaration needs to be visible but
2106  /// isn't, and suggest a module import that would resolve the problem.
2107  void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
2108  MissingImportKind MIK, bool Recover = true);
2109  void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
2110  SourceLocation DeclLoc, ArrayRef<Module *> Modules,
2111  MissingImportKind MIK, bool Recover);
2112 
2113  Decl *ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
2114  SourceLocation LBraceLoc);
2115  Decl *ActOnFinishExportDecl(Scope *S, Decl *ExportDecl,
2116  SourceLocation RBraceLoc);
2117 
2118  /// \brief We've found a use of a templated declaration that would trigger an
2119  /// implicit instantiation. Check that any relevant explicit specializations
2120  /// and partial specializations are visible, and diagnose if not.
2121  void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);
2122 
2123  /// \brief We've found a use of a template specialization that would select a
2124  /// partial specialization. Check that the partial specialization is visible,
2125  /// and diagnose if not.
2126  void checkPartialSpecializationVisibility(SourceLocation Loc,
2127  NamedDecl *Spec);
2128 
2129  /// \brief Retrieve a suitable printing policy.
2131  return getPrintingPolicy(Context, PP);
2132  }
2133 
2134  /// \brief Retrieve a suitable printing policy.
2135  static PrintingPolicy getPrintingPolicy(const ASTContext &Ctx,
2136  const Preprocessor &PP);
2137 
2138  /// Scope actions.
2139  void ActOnPopScope(SourceLocation Loc, Scope *S);
2140  void ActOnTranslationUnitScope(Scope *S);
2141 
2142  Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
2143  RecordDecl *&AnonRecord);
2144  Decl *ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
2145  MultiTemplateParamsArg TemplateParams,
2146  bool IsExplicitInstantiation,
2147  RecordDecl *&AnonRecord);
2148 
2149  Decl *BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
2150  AccessSpecifier AS,
2151  RecordDecl *Record,
2152  const PrintingPolicy &Policy);
2153 
2154  Decl *BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
2155  RecordDecl *Record);
2156 
2157  /// Common ways to introduce type names without a tag for use in diagnostics.
2158  /// Keep in sync with err_tag_reference_non_tag.
2159  enum NonTagKind {
2169  };
2170 
2171  /// Given a non-tag type declaration, returns an enum useful for indicating
2172  /// what kind of non-tag type this is.
2173  NonTagKind getNonTagTypeDeclKind(const Decl *D, TagTypeKind TTK);
2174 
2175  bool isAcceptableTagRedeclaration(const TagDecl *Previous,
2176  TagTypeKind NewTag, bool isDefinition,
2177  SourceLocation NewTagLoc,
2178  const IdentifierInfo *Name);
2179 
2180  enum TagUseKind {
2181  TUK_Reference, // Reference to a tag: 'struct foo *X;'
2182  TUK_Declaration, // Fwd decl of a tag: 'struct foo;'
2183  TUK_Definition, // Definition of a tag: 'struct foo { int X; } Y;'
2184  TUK_Friend // Friend declaration: 'friend struct foo;'
2185  };
2186 
2187  Decl *ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
2188  SourceLocation KWLoc, CXXScopeSpec &SS, IdentifierInfo *Name,
2189  SourceLocation NameLoc, AttributeList *Attr,
2190  AccessSpecifier AS, SourceLocation ModulePrivateLoc,
2191  MultiTemplateParamsArg TemplateParameterLists, bool &OwnedDecl,
2192  bool &IsDependent, SourceLocation ScopedEnumKWLoc,
2193  bool ScopedEnumUsesClassTag, TypeResult UnderlyingType,
2194  bool IsTypeSpecifier, bool IsTemplateParamOrArg,
2195  SkipBodyInfo *SkipBody = nullptr);
2196 
2197  Decl *ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc,
2198  unsigned TagSpec, SourceLocation TagLoc,
2199  CXXScopeSpec &SS,
2200  IdentifierInfo *Name, SourceLocation NameLoc,
2202  MultiTemplateParamsArg TempParamLists);
2203 
2204  TypeResult ActOnDependentTag(Scope *S,
2205  unsigned TagSpec,
2206  TagUseKind TUK,
2207  const CXXScopeSpec &SS,
2208  IdentifierInfo *Name,
2209  SourceLocation TagLoc,
2210  SourceLocation NameLoc);
2211 
2212  void ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
2213  IdentifierInfo *ClassName,
2214  SmallVectorImpl<Decl *> &Decls);
2215  Decl *ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
2216  Declarator &D, Expr *BitfieldWidth);
2217 
2218  FieldDecl *HandleField(Scope *S, RecordDecl *TagD, SourceLocation DeclStart,
2219  Declarator &D, Expr *BitfieldWidth,
2220  InClassInitStyle InitStyle,
2221  AccessSpecifier AS);
2222  MSPropertyDecl *HandleMSProperty(Scope *S, RecordDecl *TagD,
2223  SourceLocation DeclStart,
2224  Declarator &D, Expr *BitfieldWidth,
2225  InClassInitStyle InitStyle,
2226  AccessSpecifier AS,
2227  AttributeList *MSPropertyAttr);
2228 
2229  FieldDecl *CheckFieldDecl(DeclarationName Name, QualType T,
2230  TypeSourceInfo *TInfo,
2231  RecordDecl *Record, SourceLocation Loc,
2232  bool Mutable, Expr *BitfieldWidth,
2233  InClassInitStyle InitStyle,
2234  SourceLocation TSSL,
2235  AccessSpecifier AS, NamedDecl *PrevDecl,
2236  Declarator *D = nullptr);
2237 
2238  bool CheckNontrivialField(FieldDecl *FD);
2239  void DiagnoseNontrivial(const CXXRecordDecl *Record, CXXSpecialMember CSM);
2240 
2242  /// The triviality of a method unaffected by "trivial_abi".
2244 
2245  /// The triviality of a method affected by "trivial_abi".
2246  TAH_ConsiderTrivialABI
2247  };
2248 
2249  bool SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM,
2250  TrivialABIHandling TAH = TAH_IgnoreTrivialABI,
2251  bool Diagnose = false);
2252  CXXSpecialMember getSpecialMember(const CXXMethodDecl *MD);
2253  void ActOnLastBitfield(SourceLocation DeclStart,
2254  SmallVectorImpl<Decl *> &AllIvarDecls);
2255  Decl *ActOnIvar(Scope *S, SourceLocation DeclStart,
2256  Declarator &D, Expr *BitfieldWidth,
2257  tok::ObjCKeywordKind visibility);
2258 
2259  // This is used for both record definitions and ObjC interface declarations.
2260  void ActOnFields(Scope* S, SourceLocation RecLoc, Decl *TagDecl,
2261  ArrayRef<Decl *> Fields,
2262  SourceLocation LBrac, SourceLocation RBrac,
2263  AttributeList *AttrList);
2264 
2265  /// ActOnTagStartDefinition - Invoked when we have entered the
2266  /// scope of a tag's definition (e.g., for an enumeration, class,
2267  /// struct, or union).
2268  void ActOnTagStartDefinition(Scope *S, Decl *TagDecl);
2269 
2270  /// Perform ODR-like check for C/ObjC when merging tag types from modules.
2271  /// Differently from C++, actually parse the body and reject / error out
2272  /// in case of a structural mismatch.
2273  bool ActOnDuplicateDefinition(DeclSpec &DS, Decl *Prev,
2274  SkipBodyInfo &SkipBody);
2275 
2277 
2278  /// \brief Invoked when we enter a tag definition that we're skipping.
2279  SkippedDefinitionContext ActOnTagStartSkippedDefinition(Scope *S, Decl *TD);
2280 
2281  Decl *ActOnObjCContainerStartDefinition(Decl *IDecl);
2282 
2283  /// ActOnStartCXXMemberDeclarations - Invoked when we have parsed a
2284  /// C++ record definition's base-specifiers clause and are starting its
2285  /// member declarations.
2286  void ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagDecl,
2287  SourceLocation FinalLoc,
2288  bool IsFinalSpelledSealed,
2289  SourceLocation LBraceLoc);
2290 
2291  /// ActOnTagFinishDefinition - Invoked once we have finished parsing
2292  /// the definition of a tag (enumeration, class, struct, or union).
2293  void ActOnTagFinishDefinition(Scope *S, Decl *TagDecl,
2294  SourceRange BraceRange);
2295 
2296  void ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context);
2297 
2298  void ActOnObjCContainerFinishDefinition();
2299 
2300  /// \brief Invoked when we must temporarily exit the objective-c container
2301  /// scope for parsing/looking-up C constructs.
2302  ///
2303  /// Must be followed by a call to \see ActOnObjCReenterContainerContext
2304  void ActOnObjCTemporaryExitContainerContext(DeclContext *DC);
2305  void ActOnObjCReenterContainerContext(DeclContext *DC);
2306 
2307  /// ActOnTagDefinitionError - Invoked when there was an unrecoverable
2308  /// error parsing the definition of a tag.
2309  void ActOnTagDefinitionError(Scope *S, Decl *TagDecl);
2310 
2311  EnumConstantDecl *CheckEnumConstant(EnumDecl *Enum,
2312  EnumConstantDecl *LastEnumConst,
2313  SourceLocation IdLoc,
2314  IdentifierInfo *Id,
2315  Expr *val);
2316  bool CheckEnumUnderlyingType(TypeSourceInfo *TI);
2317  bool CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
2318  QualType EnumUnderlyingTy, bool IsFixed,
2319  const EnumDecl *Prev);
2320 
2321  /// Determine whether the body of an anonymous enumeration should be skipped.
2322  /// \param II The name of the first enumerator.
2323  SkipBodyInfo shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
2324  SourceLocation IILoc);
2325 
2326  Decl *ActOnEnumConstant(Scope *S, Decl *EnumDecl, Decl *LastEnumConstant,
2328  AttributeList *Attrs, SourceLocation EqualLoc,
2329  Expr *Val);
2330  void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
2331  Decl *EnumDecl,
2332  ArrayRef<Decl *> Elements,
2333  Scope *S, AttributeList *Attr);
2334 
2335  DeclContext *getContainingDC(DeclContext *DC);
2336 
2337  /// Set the current declaration context until it gets popped.
2338  void PushDeclContext(Scope *S, DeclContext *DC);
2339  void PopDeclContext();
2340 
2341  /// EnterDeclaratorContext - Used when we must lookup names in the context
2342  /// of a declarator's nested name specifier.
2343  void EnterDeclaratorContext(Scope *S, DeclContext *DC);
2344  void ExitDeclaratorContext(Scope *S);
2345 
2346  /// Push the parameters of D, which must be a function, into scope.
2347  void ActOnReenterFunctionContext(Scope* S, Decl* D);
2348  void ActOnExitFunctionContext();
2349 
2350  DeclContext *getFunctionLevelDeclContext();
2351 
2352  /// getCurFunctionDecl - If inside of a function body, this returns a pointer
2353  /// to the function decl for the function being parsed. If we're currently
2354  /// in a 'block', this returns the containing context.
2355  FunctionDecl *getCurFunctionDecl();
2356 
2357  /// getCurMethodDecl - If inside of a method body, this returns a pointer to
2358  /// the method decl for the method being parsed. If we're currently
2359  /// in a 'block', this returns the containing context.
2360  ObjCMethodDecl *getCurMethodDecl();
2361 
2362  /// getCurFunctionOrMethodDecl - Return the Decl for the current ObjC method
2363  /// or C function we're in, otherwise return null. If we're currently
2364  /// in a 'block', this returns the containing context.
2365  NamedDecl *getCurFunctionOrMethodDecl();
2366 
2367  /// Add this decl to the scope shadowed decl chains.
2368  void PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext = true);
2369 
2370  /// \brief Make the given externally-produced declaration visible at the
2371  /// top level scope.
2372  ///
2373  /// \param D The externally-produced declaration to push.
2374  ///
2375  /// \param Name The name of the externally-produced declaration.
2376  void pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name);
2377 
2378  /// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
2379  /// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
2380  /// true if 'D' belongs to the given declaration context.
2381  ///
2382  /// \param AllowInlineNamespace If \c true, allow the declaration to be in the
2383  /// enclosing namespace set of the context, rather than contained
2384  /// directly within it.
2385  bool isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S = nullptr,
2386  bool AllowInlineNamespace = false);
2387 
2388  /// Finds the scope corresponding to the given decl context, if it
2389  /// happens to be an enclosing scope. Otherwise return NULL.
2390  static Scope *getScopeForDeclContext(Scope *S, DeclContext *DC);
2391 
2392  /// Subroutines of ActOnDeclarator().
2393  TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
2394  TypeSourceInfo *TInfo);
2395  bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);
2396 
2397  /// \brief Describes the kind of merge to perform for availability
2398  /// attributes (including "deprecated", "unavailable", and "availability").
2400  /// \brief Don't merge availability attributes at all.
2402  /// \brief Merge availability attributes for a redeclaration, which requires
2403  /// an exact match.
2405  /// \brief Merge availability attributes for an override, which requires
2406  /// an exact match or a weakening of constraints.
2408  /// \brief Merge availability attributes for an implementation of
2409  /// a protocol requirement.
2411  };
2412 
2413  /// Attribute merging methods. Return true if a new attribute was added.
2414  AvailabilityAttr *mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
2415  IdentifierInfo *Platform,
2416  bool Implicit,
2417  VersionTuple Introduced,
2418  VersionTuple Deprecated,
2419  VersionTuple Obsoleted,
2420  bool IsUnavailable,
2421  StringRef Message,
2422  bool IsStrict, StringRef Replacement,
2424  unsigned AttrSpellingListIndex);
2425  TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
2426  TypeVisibilityAttr::VisibilityType Vis,
2427  unsigned AttrSpellingListIndex);
2428  VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
2429  VisibilityAttr::VisibilityType Vis,
2430  unsigned AttrSpellingListIndex);
2431  UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
2432  unsigned AttrSpellingListIndex, StringRef Uuid);
2433  DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
2434  unsigned AttrSpellingListIndex);
2435  DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
2436  unsigned AttrSpellingListIndex);
2437  MSInheritanceAttr *
2438  mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
2439  unsigned AttrSpellingListIndex,
2440  MSInheritanceAttr::Spelling SemanticSpelling);
2441  FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
2442  IdentifierInfo *Format, int FormatIdx,
2443  int FirstArg, unsigned AttrSpellingListIndex);
2444  SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
2445  unsigned AttrSpellingListIndex);
2446  AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
2447  IdentifierInfo *Ident,
2448  unsigned AttrSpellingListIndex);
2449  MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
2450  unsigned AttrSpellingListIndex);
2451  OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
2452  unsigned AttrSpellingListIndex);
2453  InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, SourceRange Range,
2454  IdentifierInfo *Ident,
2455  unsigned AttrSpellingListIndex);
2456  CommonAttr *mergeCommonAttr(Decl *D, SourceRange Range, IdentifierInfo *Ident,
2457  unsigned AttrSpellingListIndex);
2458 
2459  void mergeDeclAttributes(NamedDecl *New, Decl *Old,
2460  AvailabilityMergeKind AMK = AMK_Redeclaration);
2461  void MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
2462  LookupResult &OldDecls);
2463  bool MergeFunctionDecl(FunctionDecl *New, NamedDecl *&Old, Scope *S,
2464  bool MergeTypeWithOld);
2465  bool MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
2466  Scope *S, bool MergeTypeWithOld);
2467  void mergeObjCMethodDecls(ObjCMethodDecl *New, ObjCMethodDecl *Old);
2468  void MergeVarDecl(VarDecl *New, LookupResult &Previous);
2469  void MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool MergeTypeWithOld);
2470  void MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old);
2471  bool checkVarDeclRedefinition(VarDecl *OldDefn, VarDecl *NewDefn);
2472  void notePreviousDefinition(const NamedDecl *Old, SourceLocation New);
2473  bool MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, Scope *S);
2474 
2475  // AssignmentAction - This is used by all the assignment diagnostic functions
2476  // to represent what is actually causing the operation
2485  AA_Passing_CFAudited
2486  };
2487 
2488  /// C++ Overloading.
2490  /// This is a legitimate overload: the existing declarations are
2491  /// functions or function templates with different signatures.
2493 
2494  /// This is not an overload because the signature exactly matches
2495  /// an existing declaration.
2497 
2498  /// This is not an overload because the lookup results contain a
2499  /// non-function.
2500  Ovl_NonFunction
2501  };
2502  OverloadKind CheckOverload(Scope *S,
2503  FunctionDecl *New,
2504  const LookupResult &OldDecls,
2505  NamedDecl *&OldDecl,
2506  bool IsForUsingDecl);
2507  bool IsOverload(FunctionDecl *New, FunctionDecl *Old, bool IsForUsingDecl,
2508  bool ConsiderCudaAttrs = true);
2509 
2510  /// \brief Checks availability of the function depending on the current
2511  /// function context.Inside an unavailable function,unavailability is ignored.
2512  ///
2513  /// \returns true if \p FD is unavailable and current context is inside
2514  /// an available function, false otherwise.
2515  bool isFunctionConsideredUnavailable(FunctionDecl *FD);
2516 
2518  TryImplicitConversion(Expr *From, QualType ToType,
2519  bool SuppressUserConversions,
2520  bool AllowExplicit,
2521  bool InOverloadResolution,
2522  bool CStyle,
2523  bool AllowObjCWritebackConversion);
2524 
2525  bool IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType);
2526  bool IsFloatingPointPromotion(QualType FromType, QualType ToType);
2527  bool IsComplexPromotion(QualType FromType, QualType ToType);
2528  bool IsPointerConversion(Expr *From, QualType FromType, QualType ToType,
2529  bool InOverloadResolution,
2530  QualType& ConvertedType, bool &IncompatibleObjC);
2531  bool isObjCPointerConversion(QualType FromType, QualType ToType,
2532  QualType& ConvertedType, bool &IncompatibleObjC);
2533  bool isObjCWritebackConversion(QualType FromType, QualType ToType,
2534  QualType &ConvertedType);
2535  bool IsBlockPointerConversion(QualType FromType, QualType ToType,
2536  QualType& ConvertedType);
2537  bool FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
2538  const FunctionProtoType *NewType,
2539  unsigned *ArgPos = nullptr);
2540  void HandleFunctionTypeMismatch(PartialDiagnostic &PDiag,
2541  QualType FromType, QualType ToType);
2542 
2543  void maybeExtendBlockObject(ExprResult &E);
2544  CastKind PrepareCastToObjCObjectPointer(ExprResult &E);
2545  bool CheckPointerConversion(Expr *From, QualType ToType,
2546  CastKind &Kind,
2547  CXXCastPath& BasePath,
2548  bool IgnoreBaseAccess,
2549  bool Diagnose = true);
2550  bool IsMemberPointerConversion(Expr *From, QualType FromType, QualType ToType,
2551  bool InOverloadResolution,
2552  QualType &ConvertedType);
2553  bool CheckMemberPointerConversion(Expr *From, QualType ToType,
2554  CastKind &Kind,
2555  CXXCastPath &BasePath,
2556  bool IgnoreBaseAccess);
2557  bool IsQualificationConversion(QualType FromType, QualType ToType,
2558  bool CStyle, bool &ObjCLifetimeConversion);
2559  bool IsFunctionConversion(QualType FromType, QualType ToType,
2560  QualType &ResultTy);
2561  bool DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType);
2562  bool isSameOrCompatibleFunctionType(CanQualType Param, CanQualType Arg);
2563 
2564  ExprResult PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
2565  const VarDecl *NRVOCandidate,
2566  QualType ResultType,
2567  Expr *Value,
2568  bool AllowNRVO = true);
2569 
2570  bool CanPerformCopyInitialization(const InitializedEntity &Entity,
2571  ExprResult Init);
2572  ExprResult PerformCopyInitialization(const InitializedEntity &Entity,
2573  SourceLocation EqualLoc,
2574  ExprResult Init,
2575  bool TopLevelOfInitList = false,
2576  bool AllowExplicit = false);
2577  ExprResult PerformObjectArgumentInitialization(Expr *From,
2578  NestedNameSpecifier *Qualifier,
2579  NamedDecl *FoundDecl,
2580  CXXMethodDecl *Method);
2581 
2582  ExprResult PerformContextuallyConvertToBool(Expr *From);
2583  ExprResult PerformContextuallyConvertToObjCPointer(Expr *From);
2584 
2585  /// Contexts in which a converted constant expression is required.
2586  enum CCEKind {
2587  CCEK_CaseValue, ///< Expression in a case label.
2588  CCEK_Enumerator, ///< Enumerator value with fixed underlying type.
2589  CCEK_TemplateArg, ///< Value of a non-type template parameter.
2590  CCEK_NewExpr, ///< Constant expression in a noptr-new-declarator.
2591  CCEK_ConstexprIf ///< Condition in a constexpr if statement.
2592  };
2594  llvm::APSInt &Value, CCEKind CCE);
2596  APValue &Value, CCEKind CCE);
2597 
2598  /// \brief Abstract base class used to perform a contextual implicit
2599  /// conversion from an expression to any type passing a filter.
2601  public:
2602  bool Suppress;
2604 
2605  ContextualImplicitConverter(bool Suppress = false,
2606  bool SuppressConversion = false)
2607  : Suppress(Suppress), SuppressConversion(SuppressConversion) {}
2608 
2609  /// \brief Determine whether the specified type is a valid destination type
2610  /// for this conversion.
2611  virtual bool match(QualType T) = 0;
2612 
2613  /// \brief Emits a diagnostic complaining that the expression does not have
2614  /// integral or enumeration type.
2615  virtual SemaDiagnosticBuilder
2616  diagnoseNoMatch(Sema &S, SourceLocation Loc, QualType T) = 0;
2617 
2618  /// \brief Emits a diagnostic when the expression has incomplete class type.
2619  virtual SemaDiagnosticBuilder
2620  diagnoseIncomplete(Sema &S, SourceLocation Loc, QualType T) = 0;
2621 
2622  /// \brief Emits a diagnostic when the only matching conversion function
2623  /// is explicit.
2624  virtual SemaDiagnosticBuilder diagnoseExplicitConv(
2625  Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;
2626 
2627  /// \brief Emits a note for the explicit conversion function.
2628  virtual SemaDiagnosticBuilder
2629  noteExplicitConv(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;
2630 
2631  /// \brief Emits a diagnostic when there are multiple possible conversion
2632  /// functions.
2633  virtual SemaDiagnosticBuilder
2634  diagnoseAmbiguous(Sema &S, SourceLocation Loc, QualType T) = 0;
2635 
2636  /// \brief Emits a note for one of the candidate conversions.
2637  virtual SemaDiagnosticBuilder
2638  noteAmbiguous(Sema &S, CXXConversionDecl *Conv, QualType ConvTy) = 0;
2639 
2640  /// \brief Emits a diagnostic when we picked a conversion function
2641  /// (for cases when we are not allowed to pick a conversion function).
2642  virtual SemaDiagnosticBuilder diagnoseConversion(
2643  Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) = 0;
2644 
2646  };
2647 
2649  bool AllowScopedEnumerations;
2650 
2651  public:
2652  ICEConvertDiagnoser(bool AllowScopedEnumerations,
2653  bool Suppress, bool SuppressConversion)
2654  : ContextualImplicitConverter(Suppress, SuppressConversion),
2655  AllowScopedEnumerations(AllowScopedEnumerations) {}
2656 
2657  /// Match an integral or (possibly scoped) enumeration type.
2658  bool match(QualType T) override;
2659 
2662  return diagnoseNotInt(S, Loc, T);
2663  }
2664 
2665  /// \brief Emits a diagnostic complaining that the expression does not have
2666  /// integral or enumeration type.
2667  virtual SemaDiagnosticBuilder
2668  diagnoseNotInt(Sema &S, SourceLocation Loc, QualType T) = 0;
2669  };
2670 
2671  /// Perform a contextual implicit conversion.
2672  ExprResult PerformContextualImplicitConversion(
2673  SourceLocation Loc, Expr *FromE, ContextualImplicitConverter &Converter);
2674 
2675 
2679  OS_Error
2680  };
2681  ObjCSubscriptKind CheckSubscriptingKind(Expr *FromE);
2682 
2683  // Note that LK_String is intentionally after the other literals, as
2684  // this is used for diagnostics logic.
2692  LK_None
2693  };
2694  ObjCLiteralKind CheckLiteralKind(Expr *FromE);
2695 
2696  ExprResult PerformObjectMemberConversion(Expr *From,
2697  NestedNameSpecifier *Qualifier,
2698  NamedDecl *FoundDecl,
2699  NamedDecl *Member);
2700 
2701  // Members have to be NamespaceDecl* or TranslationUnitDecl*.
2702  // TODO: make this is a typesafe union.
2705 
2706  void AddOverloadCandidate(FunctionDecl *Function,
2707  DeclAccessPair FoundDecl,
2708  ArrayRef<Expr *> Args,
2709  OverloadCandidateSet &CandidateSet,
2710  bool SuppressUserConversions = false,
2711  bool PartialOverloading = false,
2712  bool AllowExplicit = false,
2713  ConversionSequenceList EarlyConversions = None);
2714  void AddFunctionCandidates(const UnresolvedSetImpl &Functions,
2715  ArrayRef<Expr *> Args,
2716  OverloadCandidateSet &CandidateSet,
2717  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
2718  bool SuppressUserConversions = false,
2719  bool PartialOverloading = false,
2720  bool FirstArgumentIsBase = false);
2721  void AddMethodCandidate(DeclAccessPair FoundDecl,
2722  QualType ObjectType,
2723  Expr::Classification ObjectClassification,
2724  ArrayRef<Expr *> Args,
2725  OverloadCandidateSet& CandidateSet,
2726  bool SuppressUserConversion = false);
2727  void AddMethodCandidate(CXXMethodDecl *Method,
2728  DeclAccessPair FoundDecl,
2729  CXXRecordDecl *ActingContext, QualType ObjectType,
2730  Expr::Classification ObjectClassification,
2731  ArrayRef<Expr *> Args,
2732  OverloadCandidateSet& CandidateSet,
2733  bool SuppressUserConversions = false,
2734  bool PartialOverloading = false,
2735  ConversionSequenceList EarlyConversions = None);
2736  void AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl,
2737  DeclAccessPair FoundDecl,
2738  CXXRecordDecl *ActingContext,
2739  TemplateArgumentListInfo *ExplicitTemplateArgs,
2740  QualType ObjectType,
2741  Expr::Classification ObjectClassification,
2742  ArrayRef<Expr *> Args,
2743  OverloadCandidateSet& CandidateSet,
2744  bool SuppressUserConversions = false,
2745  bool PartialOverloading = false);
2746  void AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate,
2747  DeclAccessPair FoundDecl,
2748  TemplateArgumentListInfo *ExplicitTemplateArgs,
2749  ArrayRef<Expr *> Args,
2750  OverloadCandidateSet& CandidateSet,
2751  bool SuppressUserConversions = false,
2752  bool PartialOverloading = false);
2753  bool CheckNonDependentConversions(FunctionTemplateDecl *FunctionTemplate,
2754  ArrayRef<QualType> ParamTypes,
2755  ArrayRef<Expr *> Args,
2756  OverloadCandidateSet &CandidateSet,
2757  ConversionSequenceList &Conversions,
2758  bool SuppressUserConversions,
2759  CXXRecordDecl *ActingContext = nullptr,
2760  QualType ObjectType = QualType(),
2762  ObjectClassification = {});
2763  void AddConversionCandidate(CXXConversionDecl *Conversion,
2764  DeclAccessPair FoundDecl,
2765  CXXRecordDecl *ActingContext,
2766  Expr *From, QualType ToType,
2767  OverloadCandidateSet& CandidateSet,
2768  bool AllowObjCConversionOnExplicit,
2769  bool AllowResultConversion = true);
2770  void AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate,
2771  DeclAccessPair FoundDecl,
2772  CXXRecordDecl *ActingContext,
2773  Expr *From, QualType ToType,
2774  OverloadCandidateSet &CandidateSet,
2775  bool AllowObjCConversionOnExplicit,
2776  bool AllowResultConversion = true);
2777  void AddSurrogateCandidate(CXXConversionDecl *Conversion,
2778  DeclAccessPair FoundDecl,
2779  CXXRecordDecl *ActingContext,
2780  const FunctionProtoType *Proto,
2781  Expr *Object, ArrayRef<Expr *> Args,
2782  OverloadCandidateSet& CandidateSet);
2783  void AddMemberOperatorCandidates(OverloadedOperatorKind Op,
2784  SourceLocation OpLoc, ArrayRef<Expr *> Args,
2785  OverloadCandidateSet& CandidateSet,
2786  SourceRange OpRange = SourceRange());
2787  void AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args,
2788  OverloadCandidateSet& CandidateSet,
2789  bool IsAssignmentOperator = false,
2790  unsigned NumContextualBoolArguments = 0);
2791  void AddBuiltinOperatorCandidates(OverloadedOperatorKind Op,
2792  SourceLocation OpLoc, ArrayRef<Expr *> Args,
2793  OverloadCandidateSet& CandidateSet);
2794  void AddArgumentDependentLookupCandidates(DeclarationName Name,
2795  SourceLocation Loc,
2796  ArrayRef<Expr *> Args,
2797  TemplateArgumentListInfo *ExplicitTemplateArgs,
2798  OverloadCandidateSet& CandidateSet,
2799  bool PartialOverloading = false);
2800 
2801  // Emit as a 'note' the specific overload candidate
2802  void NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn,
2803  QualType DestType = QualType(),
2804  bool TakingAddress = false);
2805 
2806  // Emit as a series of 'note's all template and non-templates identified by
2807  // the expression Expr
2808  void NoteAllOverloadCandidates(Expr *E, QualType DestType = QualType(),
2809  bool TakingAddress = false);
2810 
2811  /// Check the enable_if expressions on the given function. Returns the first
2812  /// failing attribute, or NULL if they were all successful.
2813  EnableIfAttr *CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args,
2814  bool MissingImplicitThis = false);
2815 
2816  /// Find the failed Boolean condition within a given Boolean
2817  /// constant expression, and describe it with a string.
2818  ///
2819  /// \param AllowTopLevelCond Whether to allow the result to be the
2820  /// complete top-level condition.
2821  std::pair<Expr *, std::string>
2822  findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond);
2823 
2824  /// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
2825  /// non-ArgDependent DiagnoseIfAttrs.
2826  ///
2827  /// Argument-dependent diagnose_if attributes should be checked each time a
2828  /// function is used as a direct callee of a function call.
2829  ///
2830  /// Returns true if any errors were emitted.
2831  bool diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function,
2832  const Expr *ThisArg,
2834  SourceLocation Loc);
2835 
2836  /// Emit diagnostics for the diagnose_if attributes on Function, ignoring any
2837  /// ArgDependent DiagnoseIfAttrs.
2838  ///
2839  /// Argument-independent diagnose_if attributes should be checked on every use
2840  /// of a function.
2841  ///
2842  /// Returns true if any errors were emitted.
2843  bool diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND,
2844  SourceLocation Loc);
2845 
2846  /// Returns whether the given function's address can be taken or not,
2847  /// optionally emitting a diagnostic if the address can't be taken.
2848  ///
2849  /// Returns false if taking the address of the function is illegal.
2850  bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function,
2851  bool Complain = false,
2852  SourceLocation Loc = SourceLocation());
2853 
2854  // [PossiblyAFunctionType] --> [Return]
2855  // NonFunctionType --> NonFunctionType
2856  // R (A) --> R(A)
2857  // R (*)(A) --> R (A)
2858  // R (&)(A) --> R (A)
2859  // R (S::*)(A) --> R (A)
2860  QualType ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType);
2861 
2862  FunctionDecl *
2863  ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr,
2864  QualType TargetType,
2865  bool Complain,
2866  DeclAccessPair &Found,
2867  bool *pHadMultipleCandidates = nullptr);
2868 
2869  FunctionDecl *
2870  resolveAddressOfOnlyViableOverloadCandidate(Expr *E,
2871  DeclAccessPair &FoundResult);
2872 
2873  bool resolveAndFixAddressOfOnlyViableOverloadCandidate(
2874  ExprResult &SrcExpr, bool DoFunctionPointerConversion = false);
2875 
2876  FunctionDecl *
2877  ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl,
2878  bool Complain = false,
2879  DeclAccessPair *Found = nullptr);
2880 
2881  bool ResolveAndFixSingleFunctionTemplateSpecialization(
2882  ExprResult &SrcExpr,
2883  bool DoFunctionPointerConverion = false,
2884  bool Complain = false,
2885  SourceRange OpRangeForComplaining = SourceRange(),
2886  QualType DestTypeForComplaining = QualType(),
2887  unsigned DiagIDForComplaining = 0);
2888 
2889 
2890  Expr *FixOverloadedFunctionReference(Expr *E,
2891  DeclAccessPair FoundDecl,
2892  FunctionDecl *Fn);
2893  ExprResult FixOverloadedFunctionReference(ExprResult,
2894  DeclAccessPair FoundDecl,
2895  FunctionDecl *Fn);
2896 
2897  void AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE,
2898  ArrayRef<Expr *> Args,
2899  OverloadCandidateSet &CandidateSet,
2900  bool PartialOverloading = false);
2901 
2902  // An enum used to represent the different possible results of building a
2903  // range-based for loop.
2907  FRS_DiagnosticIssued
2908  };
2909 
2910  ForRangeStatus BuildForRangeBeginEndCall(SourceLocation Loc,
2911  SourceLocation RangeLoc,
2912  const DeclarationNameInfo &NameInfo,
2913  LookupResult &MemberLookup,
2914  OverloadCandidateSet *CandidateSet,
2915  Expr *Range, ExprResult *CallExpr);
2916 
2917  ExprResult BuildOverloadedCallExpr(Scope *S, Expr *Fn,
2918  UnresolvedLookupExpr *ULE,
2919  SourceLocation LParenLoc,
2920  MultiExprArg Args,
2921  SourceLocation RParenLoc,
2922  Expr *ExecConfig,
2923  bool AllowTypoCorrection=true,
2924  bool CalleesAddressIsTaken=false);
2925 
2926  bool buildOverloadedCallSet(Scope *S, Expr *Fn, UnresolvedLookupExpr *ULE,
2927  MultiExprArg Args, SourceLocation RParenLoc,
2928  OverloadCandidateSet *CandidateSet,
2929  ExprResult *Result);
2930 
2931  ExprResult CreateOverloadedUnaryOp(SourceLocation OpLoc,
2932  UnaryOperatorKind Opc,
2933  const UnresolvedSetImpl &Fns,
2934  Expr *input, bool RequiresADL = true);
2935 
2936  ExprResult CreateOverloadedBinOp(SourceLocation OpLoc,
2937  BinaryOperatorKind Opc,
2938  const UnresolvedSetImpl &Fns,
2939  Expr *LHS, Expr *RHS,
2940  bool RequiresADL = true);
2941 
2942  ExprResult CreateOverloadedArraySubscriptExpr(SourceLocation LLoc,
2943  SourceLocation RLoc,
2944  Expr *Base,Expr *Idx);
2945 
2946  ExprResult
2947  BuildCallToMemberFunction(Scope *S, Expr *MemExpr,
2948  SourceLocation LParenLoc,
2949  MultiExprArg Args,
2950  SourceLocation RParenLoc);
2951  ExprResult
2952  BuildCallToObjectOfClassType(Scope *S, Expr *Object, SourceLocation LParenLoc,
2953  MultiExprArg Args,
2954  SourceLocation RParenLoc);
2955 
2956  ExprResult BuildOverloadedArrowExpr(Scope *S, Expr *Base,
2957  SourceLocation OpLoc,
2958  bool *NoArrowOperatorFound = nullptr);
2959 
2960  /// CheckCallReturnType - Checks that a call expression's return type is
2961  /// complete. Returns true on failure. The location passed in is the location
2962  /// that best represents the call.
2963  bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
2964  CallExpr *CE, FunctionDecl *FD);
2965 
2966  /// Helpers for dealing with blocks and functions.
2967  bool CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
2968  bool CheckParameterNames);
2969  void CheckCXXDefaultArguments(FunctionDecl *FD);
2970  void CheckExtraCXXDefaultArguments(Declarator &D);
2971  Scope *getNonFieldDeclScope(Scope *S);
2972 
2973  /// \name Name lookup
2974  ///
2975  /// These routines provide name lookup that is used during semantic
2976  /// analysis to resolve the various kinds of names (identifiers,
2977  /// overloaded operator names, constructor names, etc.) into zero or
2978  /// more declarations within a particular scope. The major entry
2979  /// points are LookupName, which performs unqualified name lookup,
2980  /// and LookupQualifiedName, which performs qualified name lookup.
2981  ///
2982  /// All name lookup is performed based on some specific criteria,
2983  /// which specify what names will be visible to name lookup and how
2984  /// far name lookup should work. These criteria are important both
2985  /// for capturing language semantics (certain lookups will ignore
2986  /// certain names, for example) and for performance, since name
2987  /// lookup is often a bottleneck in the compilation of C++. Name
2988  /// lookup criteria is specified via the LookupCriteria enumeration.
2989  ///
2990  /// The results of name lookup can vary based on the kind of name
2991  /// lookup performed, the current language, and the translation
2992  /// unit. In C, for example, name lookup will either return nothing
2993  /// (no entity found) or a single declaration. In C++, name lookup
2994  /// can additionally refer to a set of overloaded functions or
2995  /// result in an ambiguity. All of the possible results of name
2996  /// lookup are captured by the LookupResult class, which provides
2997  /// the ability to distinguish among them.
2998  //@{
2999 
3000  /// @brief Describes the kind of name lookup to perform.
3002  /// Ordinary name lookup, which finds ordinary names (functions,
3003  /// variables, typedefs, etc.) in C and most kinds of names
3004  /// (functions, variables, members, types, etc.) in C++.
3005  LookupOrdinaryName = 0,
3006  /// Tag name lookup, which finds the names of enums, classes,
3007  /// structs, and unions.
3009  /// Label name lookup.
3011  /// Member name lookup, which finds the names of
3012  /// class/struct/union members.
3014  /// Look up of an operator name (e.g., operator+) for use with
3015  /// operator overloading. This lookup is similar to ordinary name
3016  /// lookup, but will ignore any declarations that are class members.
3018  /// Look up of a name that precedes the '::' scope resolution
3019  /// operator in C++. This lookup completely ignores operator, object,
3020  /// function, and enumerator names (C++ [basic.lookup.qual]p1).
3022  /// Look up a namespace name within a C++ using directive or
3023  /// namespace alias definition, ignoring non-namespace names (C++
3024  /// [basic.lookup.udir]p1).
3026  /// Look up all declarations in a scope with the given name,
3027  /// including resolved using declarations. This is appropriate
3028  /// for checking redeclarations for a using declaration.
3030  /// Look up an ordinary name that is going to be redeclared as a
3031  /// name with linkage. This lookup ignores any declarations that
3032  /// are outside of the current scope unless they have linkage. See
3033  /// C99 6.2.2p4-5 and C++ [basic.link]p6.
3035  /// Look up a friend of a local class. This lookup does not look
3036  /// outside the innermost non-class scope. See C++11 [class.friend]p11.
3038  /// Look up the name of an Objective-C protocol.
3040  /// Look up implicit 'self' parameter of an objective-c method.
3042  /// \brief Look up the name of an OpenMP user-defined reduction operation.
3044  /// \brief Look up any declaration with any name.
3045  LookupAnyName
3046  };
3047 
3048  /// \brief Specifies whether (or how) name lookup is being performed for a
3049  /// redeclaration (vs. a reference).
3051  /// \brief The lookup is a reference to this name that is not for the
3052  /// purpose of redeclaring the name.
3053  NotForRedeclaration = 0,
3054  /// \brief The lookup results will be used for redeclaration of a name,
3055  /// if an entity by that name already exists and is visible.
3057  /// \brief The lookup results will be used for redeclaration of a name
3058  /// with external linkage; non-visible lookup results with external linkage
3059  /// may also be found.
3060  ForExternalRedeclaration
3061  };
3062 
3064  // A declaration with an owning module for linkage can never link against
3065  // anything that is not visible. We don't need to check linkage here; if
3066  // the context has internal linkage, redeclaration lookup won't find things
3067  // from other TUs, and we can't safely compute linkage yet in general.
3068  if (cast<Decl>(CurContext)
3069  ->getOwningModuleForLinkage(/*IgnoreLinkage*/true))
3070  return ForVisibleRedeclaration;
3071  return ForExternalRedeclaration;
3072  }
3073 
3074  /// \brief The possible outcomes of name lookup for a literal operator.
3076  /// \brief The lookup resulted in an error.
3078  /// \brief The lookup found no match but no diagnostic was issued.
3080  /// \brief The lookup found a single 'cooked' literal operator, which
3081  /// expects a normal literal to be built and passed to it.
3083  /// \brief The lookup found a single 'raw' literal operator, which expects
3084  /// a string literal containing the spelling of the literal token.
3086  /// \brief The lookup found an overload set of literal operator templates,
3087  /// which expect the characters of the spelling of the literal token to be
3088  /// passed as a non-type template argument pack.
3090  /// \brief The lookup found an overload set of literal operator templates,
3091  /// which expect the character type and characters of the spelling of the
3092  /// string literal token to be passed as template arguments.
3093  LOLR_StringTemplate
3094  };
3095 
3096  SpecialMemberOverloadResult LookupSpecialMember(CXXRecordDecl *D,
3098  bool ConstArg,
3099  bool VolatileArg,
3100  bool RValueThis,
3101  bool ConstThis,
3102  bool VolatileThis);
3103 
3104  typedef std::function<void(const TypoCorrection &)> TypoDiagnosticGenerator;
3105  typedef std::function<ExprResult(Sema &, TypoExpr *, TypoCorrection)>
3107 
3108 private:
3109  bool CppLookupName(LookupResult &R, Scope *S);
3110 
3111  struct TypoExprState {
3112  std::unique_ptr<TypoCorrectionConsumer> Consumer;
3113  TypoDiagnosticGenerator DiagHandler;
3114  TypoRecoveryCallback RecoveryHandler;
3115  TypoExprState();
3116  TypoExprState(TypoExprState &&other) noexcept;
3117  TypoExprState &operator=(TypoExprState &&other) noexcept;
3118  };
3119 
3120  /// \brief The set of unhandled TypoExprs and their associated state.
3121  llvm::MapVector<TypoExpr *, TypoExprState> DelayedTypos;
3122 
3123  /// \brief Creates a new TypoExpr AST node.
3124  TypoExpr *createDelayedTypo(std::unique_ptr<TypoCorrectionConsumer> TCC,
3125  TypoDiagnosticGenerator TDG,
3126  TypoRecoveryCallback TRC);
3127 
3128  // \brief The set of known/encountered (unique, canonicalized) NamespaceDecls.
3129  //
3130  // The boolean value will be true to indicate that the namespace was loaded
3131  // from an AST/PCH file, or false otherwise.
3132  llvm::MapVector<NamespaceDecl*, bool> KnownNamespaces;
3133 
3134  /// \brief Whether we have already loaded known namespaces from an extenal
3135  /// source.
3136  bool LoadedExternalKnownNamespaces;
3137 
3138  /// \brief Helper for CorrectTypo and CorrectTypoDelayed used to create and
3139  /// populate a new TypoCorrectionConsumer. Returns nullptr if typo correction
3140  /// should be skipped entirely.
3141  std::unique_ptr<TypoCorrectionConsumer>
3142  makeTypoCorrectionConsumer(const DeclarationNameInfo &Typo,
3143  Sema::LookupNameKind LookupKind, Scope *S,
3144  CXXScopeSpec *SS,
3145  std::unique_ptr<CorrectionCandidateCallback> CCC,
3146  DeclContext *MemberContext, bool EnteringContext,
3147  const ObjCObjectPointerType *OPT,
3148  bool ErrorRecovery);
3149 
3150 public:
3151  const TypoExprState &getTypoExprState(TypoExpr *TE) const;
3152 
3153  /// \brief Clears the state of the given TypoExpr.
3154  void clearDelayedTypo(TypoExpr *TE);
3155 
3156  /// \brief Look up a name, looking for a single declaration. Return
3157  /// null if the results were absent, ambiguous, or overloaded.
3158  ///
3159  /// It is preferable to use the elaborated form and explicitly handle
3160  /// ambiguity and overloaded.
3161  NamedDecl *LookupSingleName(Scope *S, DeclarationName Name,
3162  SourceLocation Loc,
3163  LookupNameKind NameKind,
3164  RedeclarationKind Redecl
3165  = NotForRedeclaration);
3166  bool LookupName(LookupResult &R, Scope *S,
3167  bool AllowBuiltinCreation = false);
3168  bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
3169  bool InUnqualifiedLookup = false);
3170  bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
3171  CXXScopeSpec &SS);
3172  bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
3173  bool AllowBuiltinCreation = false,
3174  bool EnteringContext = false);
3175  ObjCProtocolDecl *LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc,
3176  RedeclarationKind Redecl
3177  = NotForRedeclaration);
3178  bool LookupInSuper(LookupResult &R, CXXRecordDecl *Class);
3179 
3180  void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S,
3181  QualType T1, QualType T2,
3182  UnresolvedSetImpl &Functions);
3183 
3184  LabelDecl *LookupOrCreateLabel(IdentifierInfo *II, SourceLocation IdentLoc,
3185  SourceLocation GnuLabelLoc = SourceLocation());
3186 
3187  DeclContextLookupResult LookupConstructors(CXXRecordDecl *Class);
3188  CXXConstructorDecl *LookupDefaultConstructor(CXXRecordDecl *Class);
3189  CXXConstructorDecl *LookupCopyingConstructor(CXXRecordDecl *Class,
3190  unsigned Quals);
3191  CXXMethodDecl *LookupCopyingAssignment(CXXRecordDecl *Class, unsigned Quals,
3192  bool RValueThis, unsigned ThisQuals);
3193  CXXConstructorDecl *LookupMovingConstructor(CXXRecordDecl *Class,
3194  unsigned Quals);
3195  CXXMethodDecl *LookupMovingAssignment(CXXRecordDecl *Class, unsigned Quals,
3196  bool RValueThis, unsigned ThisQuals);
3197  CXXDestructorDecl *LookupDestructor(CXXRecordDecl *Class);
3198 
3199  bool checkLiteralOperatorId(const CXXScopeSpec &SS, const UnqualifiedId &Id);
3200  LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R,
3201  ArrayRef<QualType> ArgTys,
3202  bool AllowRaw,
3203  bool AllowTemplate,
3204  bool AllowStringTemplate,
3205  bool DiagnoseMissing);
3206  bool isKnownName(StringRef name);
3207 
3208  void ArgumentDependentLookup(DeclarationName Name, SourceLocation Loc,
3209  ArrayRef<Expr *> Args, ADLResult &Functions);
3210 
3211  void LookupVisibleDecls(Scope *S, LookupNameKind Kind,
3212  VisibleDeclConsumer &Consumer,
3213  bool IncludeGlobalScope = true,
3214  bool LoadExternal = true);
3216  VisibleDeclConsumer &Consumer,
3217  bool IncludeGlobalScope = true,
3218  bool IncludeDependentBases = false,
3219  bool LoadExternal = true);
3220 
3222  CTK_NonError, // CorrectTypo used in a non error recovery situation.
3223  CTK_ErrorRecovery // CorrectTypo used in normal error recovery.
3224  };
3225 
3226  TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo,
3227  Sema::LookupNameKind LookupKind,
3228  Scope *S, CXXScopeSpec *SS,
3229  std::unique_ptr<CorrectionCandidateCallback> CCC,
3230  CorrectTypoKind Mode,
3231  DeclContext *MemberContext = nullptr,
3232  bool EnteringContext = false,
3233  const ObjCObjectPointerType *OPT = nullptr,
3234  bool RecordFailure = true);
3235 
3236  TypoExpr *CorrectTypoDelayed(const DeclarationNameInfo &Typo,
3237  Sema::LookupNameKind LookupKind, Scope *S,
3238  CXXScopeSpec *SS,
3239  std::unique_ptr<CorrectionCandidateCallback> CCC,
3240  TypoDiagnosticGenerator TDG,
3242  DeclContext *MemberContext = nullptr,
3243  bool EnteringContext = false,
3244  const ObjCObjectPointerType *OPT = nullptr);
3245 
3246  /// \brief Process any TypoExprs in the given Expr and its children,
3247  /// generating diagnostics as appropriate and returning a new Expr if there
3248  /// were typos that were all successfully corrected and ExprError if one or
3249  /// more typos could not be corrected.
3250  ///
3251  /// \param E The Expr to check for TypoExprs.
3252  ///
3253  /// \param InitDecl A VarDecl to avoid because the Expr being corrected is its
3254  /// initializer.
3255  ///
3256  /// \param Filter A function applied to a newly rebuilt Expr to determine if
3257  /// it is an acceptable/usable result from a single combination of typo
3258  /// corrections. As long as the filter returns ExprError, different
3259  /// combinations of corrections will be tried until all are exhausted.
3260  ExprResult
3261  CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl = nullptr,
3262  llvm::function_ref<ExprResult(Expr *)> Filter =
3263  [](Expr *E) -> ExprResult { return E; });
3264 
3265  ExprResult
3267  llvm::function_ref<ExprResult(Expr *)> Filter) {
3268  return CorrectDelayedTyposInExpr(E, nullptr, Filter);
3269  }
3270 
3271  ExprResult
3272  CorrectDelayedTyposInExpr(ExprResult ER, VarDecl *InitDecl = nullptr,
3273  llvm::function_ref<ExprResult(Expr *)> Filter =
3274  [](Expr *E) -> ExprResult { return E; }) {
3275  return ER.isInvalid() ? ER : CorrectDelayedTyposInExpr(ER.get(), Filter);
3276  }
3277 
3278  ExprResult
3280  llvm::function_ref<ExprResult(Expr *)> Filter) {
3281  return CorrectDelayedTyposInExpr(ER, nullptr, Filter);
3282  }
3283 
3284  void diagnoseTypo(const TypoCorrection &Correction,
3285  const PartialDiagnostic &TypoDiag,
3286  bool ErrorRecovery = true);
3287 
3288  void diagnoseTypo(const TypoCorrection &Correction,
3289  const PartialDiagnostic &TypoDiag,
3290  const PartialDiagnostic &PrevNote,
3291  bool ErrorRecovery = true);
3292 
3293  void MarkTypoCorrectedFunctionDefinition(const NamedDecl *F);
3294 
3295  void FindAssociatedClassesAndNamespaces(SourceLocation InstantiationLoc,
3296  ArrayRef<Expr *> Args,
3297  AssociatedNamespaceSet &AssociatedNamespaces,
3298  AssociatedClassSet &AssociatedClasses);
3299 
3300  void FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
3301  bool ConsiderLinkage, bool AllowInlineNamespace);
3302 
3303  bool CheckRedeclarationModuleOwnership(NamedDecl *New, NamedDecl *Old);
3304 
3305  void DiagnoseAmbiguousLookup(LookupResult &Result);
3306  //@}
3307 
3308  ObjCInterfaceDecl *getObjCInterfaceDecl(IdentifierInfo *&Id,
3309  SourceLocation IdLoc,
3310  bool TypoCorrection = false);
3311  NamedDecl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
3312  Scope *S, bool ForRedeclaration,
3313  SourceLocation Loc);
3314  NamedDecl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II,
3315  Scope *S);
3316  void AddKnownFunctionAttributes(FunctionDecl *FD);
3317 
3318  // More parsing and symbol table subroutines.
3319 
3320  void ProcessPragmaWeak(Scope *S, Decl *D);
3321  // Decl attributes - this routine is the top level dispatcher.
3322  void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD);
3323  // Helper for delayed processing of attributes.
3324  void ProcessDeclAttributeDelayed(Decl *D, const AttributeList *AttrList);
3325  void ProcessDeclAttributeList(Scope *S, Decl *D, const AttributeList *AL,
3326  bool IncludeCXX11Attributes = true);
3327  bool ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl,
3328  const AttributeList *AttrList);
3329 
3331 
3332  /// Determine if type T is a valid subject for a nonnull and similar
3333  /// attributes. By default, we look through references (the behavior used by
3334  /// nonnull), but if the second parameter is true, then we treat a reference
3335  /// type as valid.
3336  bool isValidPointerAttrType(QualType T, bool RefOkay = false);
3337 
3338  bool CheckRegparmAttr(const AttributeList &attr, unsigned &value);
3339  bool CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC,
3340  const FunctionDecl *FD = nullptr);
3341  bool CheckNoReturnAttr(const AttributeList &attr);
3342  bool CheckNoCallerSavedRegsAttr(const AttributeList &attr);
3343  bool checkStringLiteralArgumentAttr(const AttributeList &Attr,
3344  unsigned ArgNum, StringRef &Str,
3345  SourceLocation *ArgLocation = nullptr);
3346  bool checkSectionName(SourceLocation LiteralLoc, StringRef Str);
3347  bool checkTargetAttr(SourceLocation LiteralLoc, StringRef Str);
3348  bool checkMSInheritanceAttrOnDefinition(
3349  CXXRecordDecl *RD, SourceRange Range, bool BestCase,
3350  MSInheritanceAttr::Spelling SemanticSpelling);
3351 
3352  void CheckAlignasUnderalignment(Decl *D);
3353 
3354  /// Adjust the calling convention of a method to be the ABI default if it
3355  /// wasn't specified explicitly. This handles method types formed from
3356  /// function type typedefs and typename template arguments.
3357  void adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
3358  SourceLocation Loc);
3359 
3360  // Check if there is an explicit attribute, but only look through parens.
3361  // The intent is to look for an attribute on the current declarator, but not
3362  // one that came from a typedef.
3363  bool hasExplicitCallingConv(QualType &T);
3364 
3365  /// Get the outermost AttributedType node that sets a calling convention.
3366  /// Valid types should not have multiple attributes with different CCs.
3367  const AttributedType *getCallingConvAttributedType(QualType T) const;
3368 
3369  /// Check whether a nullability type specifier can be added to the given
3370  /// type.
3371  ///
3372  /// \param type The type to which the nullability specifier will be
3373  /// added. On success, this type will be updated appropriately.
3374  ///
3375  /// \param nullability The nullability specifier to add.
3376  ///
3377  /// \param nullabilityLoc The location of the nullability specifier.
3378  ///
3379  /// \param isContextSensitive Whether this nullability specifier was
3380  /// written as a context-sensitive keyword (in an Objective-C
3381  /// method) or an Objective-C property attribute, rather than as an
3382  /// underscored type specifier.
3383  ///
3384  /// \param allowArrayTypes Whether to accept nullability specifiers on an
3385  /// array type (e.g., because it will decay to a pointer).
3386  ///
3387  /// \returns true if nullability cannot be applied, false otherwise.
3388  bool checkNullabilityTypeSpecifier(QualType &type, NullabilityKind nullability,
3389  SourceLocation nullabilityLoc,
3390  bool isContextSensitive,
3391  bool allowArrayTypes);
3392 
3393  /// \brief Stmt attributes - this routine is the top level dispatcher.
3394  StmtResult ProcessStmtAttributes(Stmt *Stmt, AttributeList *Attrs,
3395  SourceRange Range);
3396 
3397  void WarnConflictingTypedMethods(ObjCMethodDecl *Method,
3398  ObjCMethodDecl *MethodDecl,
3399  bool IsProtocolMethodDecl);
3400 
3401  void CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
3402  ObjCMethodDecl *Overridden,
3403  bool IsProtocolMethodDecl);
3404 
3405  /// WarnExactTypedMethods - This routine issues a warning if method
3406  /// implementation declaration matches exactly that of its declaration.
3407  void WarnExactTypedMethods(ObjCMethodDecl *Method,
3408  ObjCMethodDecl *MethodDecl,
3409  bool IsProtocolMethodDecl);
3410 
3411  typedef llvm::SmallPtrSet<Selector, 8> SelectorSet;
3412 
3413  /// CheckImplementationIvars - This routine checks if the instance variables
3414  /// listed in the implelementation match those listed in the interface.
3415  void CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
3416  ObjCIvarDecl **Fields, unsigned nIvars,
3417  SourceLocation Loc);
3418 
3419  /// ImplMethodsVsClassMethods - This is main routine to warn if any method
3420  /// remains unimplemented in the class or category \@implementation.
3421  void ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
3422  ObjCContainerDecl* IDecl,
3423  bool IncompleteImpl = false);
3424 
3425  /// DiagnoseUnimplementedProperties - This routine warns on those properties
3426  /// which must be implemented by this implementation.
3427  void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
3428  ObjCContainerDecl *CDecl,
3429  bool SynthesizeProperties);
3430 
3431  /// Diagnose any null-resettable synthesized setters.
3432  void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl);
3433 
3434  /// DefaultSynthesizeProperties - This routine default synthesizes all
3435  /// properties which must be synthesized in the class's \@implementation.
3436  void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl,
3437  ObjCInterfaceDecl *IDecl,
3438  SourceLocation AtEnd);
3439  void DefaultSynthesizeProperties(Scope *S, Decl *D, SourceLocation AtEnd);
3440 
3441  /// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
3442  /// an ivar synthesized for 'Method' and 'Method' is a property accessor
3443  /// declared in class 'IFace'.
3444  bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace,
3445  ObjCMethodDecl *Method, ObjCIvarDecl *IV);
3446 
3447  /// DiagnoseUnusedBackingIvarInAccessor - Issue an 'unused' warning if ivar which
3448  /// backs the property is not used in the property's accessor.
3449  void DiagnoseUnusedBackingIvarInAccessor(Scope *S,
3450  const ObjCImplementationDecl *ImplD);
3451 
3452  /// GetIvarBackingPropertyAccessor - If method is a property setter/getter and
3453  /// it property has a backing ivar, returns this ivar; otherwise, returns NULL.
3454  /// It also returns ivar's property on success.
3455  ObjCIvarDecl *GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
3456  const ObjCPropertyDecl *&PDecl) const;
3457 
3458  /// Called by ActOnProperty to handle \@property declarations in
3459  /// class extensions.
3460  ObjCPropertyDecl *HandlePropertyInClassExtension(Scope *S,
3461  SourceLocation AtLoc,
3462  SourceLocation LParenLoc,
3463  FieldDeclarator &FD,
3464  Selector GetterSel,
3465  SourceLocation GetterNameLoc,
3466  Selector SetterSel,
3467  SourceLocation SetterNameLoc,
3468  const bool isReadWrite,
3469  unsigned &Attributes,
3470  const unsigned AttributesAsWritten,
3471  QualType T,
3472  TypeSourceInfo *TSI,
3473  tok::ObjCKeywordKind MethodImplKind);
3474 
3475  /// Called by ActOnProperty and HandlePropertyInClassExtension to
3476  /// handle creating the ObjcPropertyDecl for a category or \@interface.
3477  ObjCPropertyDecl *CreatePropertyDecl(Scope *S,
3478  ObjCContainerDecl *CDecl,
3479  SourceLocation AtLoc,
3480  SourceLocation LParenLoc,
3481  FieldDeclarator &FD,
3482  Selector GetterSel,
3483  SourceLocation GetterNameLoc,
3484  Selector SetterSel,
3485  SourceLocation SetterNameLoc,
3486  const bool isReadWrite,
3487  const unsigned Attributes,
3488  const unsigned AttributesAsWritten,
3489  QualType T,
3490  TypeSourceInfo *TSI,
3491  tok::ObjCKeywordKind MethodImplKind,
3492  DeclContext *lexicalDC = nullptr);
3493 
3494  /// AtomicPropertySetterGetterRules - This routine enforces the rule (via
3495  /// warning) when atomic property has one but not the other user-declared
3496  /// setter or getter.
3497  void AtomicPropertySetterGetterRules(ObjCImplDecl* IMPDecl,
3498  ObjCInterfaceDecl* IDecl);
3499 
3500  void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D);
3501 
3502  void DiagnoseMissingDesignatedInitOverrides(
3503  const ObjCImplementationDecl *ImplD,
3504  const ObjCInterfaceDecl *IFD);
3505 
3506  void DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, ObjCInterfaceDecl *SID);
3507 
3510  MMS_strict
3511  };
3512 
3513  /// MatchTwoMethodDeclarations - Checks if two methods' type match and returns
3514  /// true, or false, accordingly.
3515  bool MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
3516  const ObjCMethodDecl *PrevMethod,
3517  MethodMatchStrategy strategy = MMS_strict);
3518 
3519  /// MatchAllMethodDeclarations - Check methods declaraed in interface or
3520  /// or protocol against those declared in their implementations.
3521  void MatchAllMethodDeclarations(const SelectorSet &InsMap,
3522  const SelectorSet &ClsMap,
3523  SelectorSet &InsMapSeen,
3524  SelectorSet &ClsMapSeen,
3525  ObjCImplDecl* IMPDecl,
3526  ObjCContainerDecl* IDecl,
3527  bool &IncompleteImpl,
3528  bool ImmediateClass,
3529  bool WarnCategoryMethodImpl=false);
3530 
3531  /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
3532  /// category matches with those implemented in its primary class and
3533  /// warns each time an exact match is found.
3534  void CheckCategoryVsClassMethodMatches(ObjCCategoryImplDecl *CatIMP);
3535 
3536  /// \brief Add the given method to the list of globally-known methods.
3537  void addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method);
3538 
3539 private:
3540  /// AddMethodToGlobalPool - Add an instance or factory method to the global
3541  /// pool. See descriptoin of AddInstanceMethodToGlobalPool.
3542  void AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, bool instance);
3543 
3544  /// LookupMethodInGlobalPool - Returns the instance or factory method and
3545  /// optionally warns if there are multiple signatures.
3546  ObjCMethodDecl *LookupMethodInGlobalPool(Selector Sel, SourceRange R,
3547  bool receiverIdOrClass,
3548  bool instance);
3549 
3550 public:
3551  /// \brief - Returns instance or factory methods in global method pool for
3552  /// given selector. It checks the desired kind first, if none is found, and
3553  /// parameter checkTheOther is set, it then checks the other kind. If no such
3554  /// method or only one method is found, function returns false; otherwise, it
3555  /// returns true.
3556  bool
3557  CollectMultipleMethodsInGlobalPool(Selector Sel,
3559  bool InstanceFirst, bool CheckTheOther,
3560  const ObjCObjectType *TypeBound = nullptr);
3561 
3562  bool
3563  AreMultipleMethodsInGlobalPool(Selector Sel, ObjCMethodDecl *BestMethod,
3564  SourceRange R, bool receiverIdOrClass,
3566 
3567  void
3568  DiagnoseMultipleMethodInGlobalPool(SmallVectorImpl<ObjCMethodDecl*> &Methods,
3569  Selector Sel, SourceRange R,
3570  bool receiverIdOrClass);
3571 
3572 private:
3573  /// \brief - Returns a selector which best matches given argument list or
3574  /// nullptr if none could be found
3575  ObjCMethodDecl *SelectBestMethod(Selector Sel, MultiExprArg Args,
3576  bool IsInstance,
3578 
3579 
3580  /// \brief Record the typo correction failure and return an empty correction.
3581  TypoCorrection FailedCorrection(IdentifierInfo *Typo, SourceLocation TypoLoc,
3582  bool RecordFailure = true) {
3583  if (RecordFailure)
3584  TypoCorrectionFailures[Typo].insert(TypoLoc);
3585  return TypoCorrection();
3586  }
3587 
3588 public:
3589  /// AddInstanceMethodToGlobalPool - All instance methods in a translation
3590  /// unit are added to a global pool. This allows us to efficiently associate
3591  /// a selector with a method declaraation for purposes of typechecking
3592  /// messages sent to "id" (where the class of the object is unknown).
3593  void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
3594  AddMethodToGlobalPool(Method, impl, /*instance*/true);
3595  }
3596 
3597  /// AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
3598  void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false) {
3599  AddMethodToGlobalPool(Method, impl, /*instance*/false);
3600  }
3601 
3602  /// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
3603  /// pool.
3604  void AddAnyMethodToGlobalPool(Decl *D);
3605 
3606  /// LookupInstanceMethodInGlobalPool - Returns the method and warns if
3607  /// there are multiple signatures.
3609  bool receiverIdOrClass=false) {
3610  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
3611  /*instance*/true);
3612  }
3613 
3614  /// LookupFactoryMethodInGlobalPool - Returns the method and warns if
3615  /// there are multiple signatures.
3617  bool receiverIdOrClass=false) {
3618  return LookupMethodInGlobalPool(Sel, R, receiverIdOrClass,
3619  /*instance*/false);
3620  }
3621 
3622  const ObjCMethodDecl *SelectorsForTypoCorrection(Selector Sel,
3623  QualType ObjectType=QualType());
3624  /// LookupImplementedMethodInGlobalPool - Returns the method which has an
3625  /// implementation.
3626  ObjCMethodDecl *LookupImplementedMethodInGlobalPool(Selector Sel);
3627 
3628  /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
3629  /// initialization.
3630  void CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
3632 
3633  //===--------------------------------------------------------------------===//
3634  // Statement Parsing Callbacks: SemaStmt.cpp.
3635 public:
3636  class FullExprArg {
3637  public:
3638  FullExprArg() : E(nullptr) { }
3639  FullExprArg(Sema &actions) : E(nullptr) { }
3640 
3642  return E;
3643  }
3644 
3645  Expr *get() const { return E; }
3646 
3648  return E;
3649  }
3650 
3651  private:
3652  // FIXME: No need to make the entire Sema class a friend when it's just
3653  // Sema::MakeFullExpr that needs access to the constructor below.
3654  friend class Sema;
3655 
3656  explicit FullExprArg(Expr *expr) : E(expr) {}
3657 
3658  Expr *E;
3659  };
3660 
3662  return MakeFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation());
3663  }
3665  return FullExprArg(ActOnFinishFullExpr(Arg, CC).get());
3666  }
3668  ExprResult FE =
3669  ActOnFinishFullExpr(Arg, Arg ? Arg->getExprLoc() : SourceLocation(),
3670  /*DiscardedValue*/ true);
3671  return FullExprArg(FE.get());
3672  }
3673 
3674  StmtResult ActOnExprStmt(ExprResult Arg);
3675  StmtResult ActOnExprStmtError();
3676 
3677  StmtResult ActOnNullStmt(SourceLocation SemiLoc,
3678  bool HasLeadingEmptyMacro = false);
3679 
3680  void ActOnStartOfCompoundStmt(bool IsStmtExpr);
3681  void ActOnFinishOfCompoundStmt();
3682  StmtResult ActOnCompoundStmt(SourceLocation L, SourceLocation R,
3683  ArrayRef<Stmt *> Elts, bool isStmtExpr);
3684 
3685  /// \brief A RAII object to enter scope of a compound statement.
3687  public:
3688  CompoundScopeRAII(Sema &S, bool IsStmtExpr = false) : S(S) {
3689  S.ActOnStartOfCompoundStmt(IsStmtExpr);
3690  }
3691 
3693  S.ActOnFinishOfCompoundStmt();
3694  }
3695 
3696  private:
3697  Sema &S;
3698  };
3699 
3700  /// An RAII helper that pops function a function scope on exit.
3703  bool Active;
3704  FunctionScopeRAII(Sema &S) : S(S), Active(true) {}
3706  if (Active)
3708  }
3709  void disable() { Active = false; }
3710  };
3711 
3712  StmtResult ActOnDeclStmt(DeclGroupPtrTy Decl,
3713  SourceLocation StartLoc,
3714  SourceLocation EndLoc);
3715  void ActOnForEachDeclStmt(DeclGroupPtrTy Decl);
3716  StmtResult ActOnForEachLValueExpr(Expr *E);
3717  StmtResult ActOnCaseStmt(SourceLocation CaseLoc, Expr *LHSVal,
3718  SourceLocation DotDotDotLoc, Expr *RHSVal,
3720  void ActOnCaseStmtBody(Stmt *CaseStmt, Stmt *SubStmt);
3721 
3722  StmtResult ActOnDefaultStmt(SourceLocation DefaultLoc,
3723  SourceLocation ColonLoc,
3724  Stmt *SubStmt, Scope *CurScope);
3725  StmtResult ActOnLabelStmt(SourceLocation IdentLoc, LabelDecl *TheDecl,
3726  SourceLocation ColonLoc, Stmt *SubStmt);
3727 
3728  StmtResult ActOnAttributedStmt(SourceLocation AttrLoc,
3729  ArrayRef<const Attr*> Attrs,
3730  Stmt *SubStmt);
3731 
3732  class ConditionResult;
3733  StmtResult ActOnIfStmt(SourceLocation IfLoc, bool IsConstexpr,
3734  Stmt *InitStmt,
3735  ConditionResult Cond, Stmt *ThenVal,
3736  SourceLocation ElseLoc, Stmt *ElseVal);
3737  StmtResult BuildIfStmt(SourceLocation IfLoc, bool IsConstexpr,
3738  Stmt *InitStmt,
3739  ConditionResult Cond, Stmt *ThenVal,
3740  SourceLocation ElseLoc, Stmt *ElseVal);
3741  StmtResult ActOnStartOfSwitchStmt(SourceLocation SwitchLoc,
3742  Stmt *InitStmt,
3743  ConditionResult Cond);
3744  StmtResult ActOnFinishSwitchStmt(SourceLocation SwitchLoc,
3745  Stmt *Switch, Stmt *Body);
3746  StmtResult ActOnWhileStmt(SourceLocation WhileLoc, ConditionResult Cond,
3747  Stmt *Body);
3748  StmtResult ActOnDoStmt(SourceLocation DoLoc, Stmt *Body,
3749  SourceLocation WhileLoc, SourceLocation CondLParen,
3750  Expr *Cond, SourceLocation CondRParen);
3751 
3752  StmtResult ActOnForStmt(SourceLocation ForLoc,
3753  SourceLocation LParenLoc,
3754  Stmt *First,
3755  ConditionResult Second,
3756  FullExprArg Third,
3757  SourceLocation RParenLoc,
3758  Stmt *Body);
3759  ExprResult CheckObjCForCollectionOperand(SourceLocation forLoc,
3760  Expr *collection);
3761  StmtResult ActOnObjCForCollectionStmt(SourceLocation ForColLoc,
3762  Stmt *First, Expr *collection,
3763  SourceLocation RParenLoc);
3764  StmtResult FinishObjCForCollectionStmt(Stmt *ForCollection, Stmt *Body);
3765 
3767  /// Initial building of a for-range statement.
3769  /// Instantiation or recovery rebuild of a for-range statement. Don't
3770  /// attempt any typo-correction.
3772  /// Determining whether a for-range statement could be built. Avoid any
3773  /// unnecessary or irreversible actions.
3774  BFRK_Check
3775  };
3776 
3777  StmtResult ActOnCXXForRangeStmt(Scope *S, SourceLocation ForLoc,
3778  SourceLocation CoawaitLoc,
3779  Stmt *LoopVar,
3780  SourceLocation ColonLoc, Expr *Collection,
3781  SourceLocation RParenLoc,
3783  StmtResult BuildCXXForRangeStmt(SourceLocation ForLoc,
3784  SourceLocation CoawaitLoc,
3785  SourceLocation ColonLoc,
3786  Stmt *RangeDecl, Stmt *Begin, Stmt *End,
3787  Expr *Cond, Expr *Inc,
3788  Stmt *LoopVarDecl,
3789  SourceLocation RParenLoc,
3791  StmtResult FinishCXXForRangeStmt(Stmt *ForRange, Stmt *Body);
3792 
3793  StmtResult ActOnGotoStmt(SourceLocation GotoLoc,
3794  SourceLocation LabelLoc,
3795  LabelDecl *TheDecl);
3796  StmtResult ActOnIndirectGotoStmt(SourceLocation GotoLoc,
3797  SourceLocation StarLoc,
3798  Expr *DestExp);
3799  StmtResult ActOnContinueStmt(SourceLocation ContinueLoc, Scope *CurScope);
3800  StmtResult ActOnBreakStmt(SourceLocation BreakLoc, Scope *CurScope);
3801 
3802  void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
3803  CapturedRegionKind Kind, unsigned NumParams);
3804  typedef std::pair<StringRef, QualType> CapturedParamNameType;
3805  void ActOnCapturedRegionStart(SourceLocation Loc, Scope *CurScope,
3808  StmtResult ActOnCapturedRegionEnd(Stmt *S);
3809  void ActOnCapturedRegionError();
3810  RecordDecl *CreateCapturedStmtRecordDecl(CapturedDecl *&CD,
3811  SourceLocation Loc,
3812  unsigned NumParams);
3813  VarDecl *getCopyElisionCandidate(QualType ReturnType, Expr *E,
3814  bool AllowParamOrMoveConstructible);
3815  bool isCopyElisionCandidate(QualType ReturnType, const VarDecl *VD,
3816  bool AllowParamOrMoveConstructible);
3817 
3818  StmtResult ActOnReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp,
3819  Scope *CurScope);
3820  StmtResult BuildReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
3821  StmtResult ActOnCapScopeReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp);
3822 
3823  StmtResult ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
3824  bool IsVolatile, unsigned NumOutputs,
3825  unsigned NumInputs, IdentifierInfo **Names,
3826  MultiExprArg Constraints, MultiExprArg Exprs,
3827  Expr *AsmString, MultiExprArg Clobbers,
3828  SourceLocation RParenLoc);
3829 
3830  void FillInlineAsmIdentifierInfo(Expr *Res,
3831  llvm::InlineAsmIdentifierInfo &Info);
3832  ExprResult LookupInlineAsmIdentifier(CXXScopeSpec &SS,
3833  SourceLocation TemplateKWLoc,
3834  UnqualifiedId &Id,
3835  bool IsUnevaluatedContext);
3836  bool LookupInlineAsmField(StringRef Base, StringRef Member,
3837  unsigned &Offset, SourceLocation AsmLoc);
3838  ExprResult LookupInlineAsmVarDeclField(Expr *RefExpr, StringRef Member,
3839  SourceLocation AsmLoc);
3840  StmtResult ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
3841  ArrayRef<Token> AsmToks,
3842  StringRef AsmString,
3843  unsigned NumOutputs, unsigned NumInputs,
3844  ArrayRef<StringRef> Constraints,
3845  ArrayRef<StringRef> Clobbers,
3846  ArrayRef<Expr*> Exprs,
3847  SourceLocation EndLoc);
3848  LabelDecl *GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
3849  SourceLocation Location,
3850  bool AlwaysCreate);
3851 
3852  VarDecl *BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType ExceptionType,
3853  SourceLocation StartLoc,
3854  SourceLocation IdLoc, IdentifierInfo *Id,
3855  bool Invalid = false);
3856 
3857  Decl *ActOnObjCExceptionDecl(Scope *S, Declarator &D);
3858 
3859  StmtResult ActOnObjCAtCatchStmt(SourceLocation AtLoc, SourceLocation RParen,
3860  Decl *Parm, Stmt *Body);
3861 
3862  StmtResult ActOnObjCAtFinallyStmt(SourceLocation AtLoc, Stmt *Body);
3863 
3864  StmtResult ActOnObjCAtTryStmt(SourceLocation AtLoc, Stmt *Try,
3865  MultiStmtArg Catch, Stmt *Finally);
3866 
3867  StmtResult BuildObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw);
3868  StmtResult ActOnObjCAtThrowStmt(SourceLocation AtLoc, Expr *Throw,
3869  Scope *CurScope);
3870  ExprResult ActOnObjCAtSynchronizedOperand(SourceLocation atLoc,
3871  Expr *operand);
3872  StmtResult ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc,
3873  Expr *SynchExpr,
3874  Stmt *SynchBody);
3875 
3876  StmtResult ActOnObjCAutoreleasePoolStmt(SourceLocation AtLoc, Stmt *Body);
3877 
3878  VarDecl *BuildExceptionDeclaration(Scope *S, TypeSourceInfo *TInfo,
3879  SourceLocation StartLoc,
3880  SourceLocation IdLoc,
3881  IdentifierInfo *Id);
3882 
3883  Decl *ActOnExceptionDeclarator(Scope *S, Declarator &D);
3884 
3885  StmtResult ActOnCXXCatchBlock(SourceLocation CatchLoc,
3886  Decl *ExDecl, Stmt *HandlerBlock);
3887  StmtResult ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
3888  ArrayRef<Stmt *> Handlers);
3889 
3890  StmtResult ActOnSEHTryBlock(bool IsCXXTry, // try (true) or __try (false) ?
3891  SourceLocation TryLoc, Stmt *TryBlock,
3892  Stmt *Handler);
3893  StmtResult ActOnSEHExceptBlock(SourceLocation Loc,
3894  Expr *FilterExpr,
3895  Stmt *Block);
3896  void ActOnStartSEHFinallyBlock();
3897  void ActOnAbortSEHFinallyBlock();
3898  StmtResult ActOnFinishSEHFinallyBlock(SourceLocation Loc, Stmt *Block);
3899  StmtResult ActOnSEHLeaveStmt(SourceLocation Loc, Scope *CurScope);
3900 
3901  void DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock);
3902 
3903  bool ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const;
3904 
3905  /// \brief If it's a file scoped decl that must warn if not used, keep track
3906  /// of it.
3907  void MarkUnusedFileScopedDecl(const DeclaratorDecl *D);
3908 
3909  /// DiagnoseUnusedExprResult - If the statement passed in is an expression
3910  /// whose result is unused, warn.
3911  void DiagnoseUnusedExprResult(const Stmt *S);
3912  void DiagnoseUnusedNestedTypedefs(const RecordDecl *D);
3913  void DiagnoseUnusedDecl(const NamedDecl *ND);
3914 
3915  /// Emit \p DiagID if statement located on \p StmtLoc has a suspicious null
3916  /// statement as a \p Body, and it is located on the same line.
3917  ///
3918  /// This helps prevent bugs due to typos, such as:
3919  /// if (condition);
3920  /// do_stuff();
3921  void DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
3922  const Stmt *Body,
3923  unsigned DiagID);
3924 
3925  /// Warn if a for/while loop statement \p S, which is followed by
3926  /// \p PossibleBody, has a suspicious null statement as a body.
3927  void DiagnoseEmptyLoopBody(const Stmt *S,
3928  const Stmt *PossibleBody);
3929 
3930  /// Warn if a value is moved to itself.
3931  void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
3932  SourceLocation OpLoc);
3933 
3934  /// \brief Warn if we're implicitly casting from a _Nullable pointer type to a
3935  /// _Nonnull one.
3936  void diagnoseNullableToNonnullConversion(QualType DstType, QualType SrcType,
3937  SourceLocation Loc);
3938 
3939  /// Warn when implicitly casting 0 to nullptr.
3940  void diagnoseZeroToNullptrConversion(CastKind Kind, const Expr *E);
3941 
3943  return DelayedDiagnostics.push(pool);
3944  }
3945  void PopParsingDeclaration(ParsingDeclState state, Decl *decl);
3946 
3947  typedef ProcessingContextState ParsingClassState;
3948  ParsingClassState PushParsingClass() {
3950  }
3951  void PopParsingClass(ParsingClassState state) {
3953  }
3954 
3955  void redelayDiagnostics(sema::DelayedDiagnosticPool &pool);
3956 
3957  void DiagnoseAvailabilityOfDecl(NamedDecl *D, SourceLocation Loc,
3958  const ObjCInterfaceDecl *UnknownObjCClass,
3959  bool ObjCPropertyAccess,
3960  bool AvoidPartialAvailabilityChecks = false);
3961 
3962  bool makeUnavailableInSystemHeader(SourceLocation loc,
3963  UnavailableAttr::ImplicitReason reason);
3964 
3965  /// \brief Issue any -Wunguarded-availability warnings in \c FD
3966  void DiagnoseUnguardedAvailabilityViolations(Decl *FD);
3967 
3968  //===--------------------------------------------------------------------===//
3969  // Expression Parsing Callbacks: SemaExpr.cpp.
3970 
3971  bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid);
3972  bool DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
3973  const ObjCInterfaceDecl *UnknownObjCClass = nullptr,
3974  bool ObjCPropertyAccess = false,
3975  bool AvoidPartialAvailabilityChecks = false);
3976  void NoteDeletedFunction(FunctionDecl *FD);
3977  void NoteDeletedInheritingConstructor(CXXConstructorDecl *CD);
3978  std::string getDeletedOrUnavailableSuffix(const FunctionDecl *FD);
3979  bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD,
3980  ObjCMethodDecl *Getter,
3981  SourceLocation Loc);
3982  void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
3983  ArrayRef<Expr *> Args);
3984 
3985  void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
3986  Decl *LambdaContextDecl = nullptr,
3987  bool IsDecltype = false);
3988  enum ReuseLambdaContextDecl_t { ReuseLambdaContextDecl };
3989  void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext,
3991  bool IsDecltype = false);
3992  void PopExpressionEvaluationContext();
3993 
3994  void DiscardCleanupsInEvaluationContext();
3995 
3996  ExprResult TransformToPotentiallyEvaluated(Expr *E);
3997  ExprResult HandleExprEvaluationContextForTypeof(Expr *E);
3998 
3999  ExprResult ActOnConstantExpression(ExprResult Res);
4000 
4001  // Functions for marking a declaration referenced. These functions also
4002  // contain the relevant logic for marking if a reference to a function or
4003  // variable is an odr-use (in the C++11 sense). There are separate variants
4004  // for expressions referring to a decl; these exist because odr-use marking
4005  // needs to be delayed for some constant variables when we build one of the
4006  // named expressions.
4007  //
4008  // MightBeOdrUse indicates whether the use could possibly be an odr-use, and
4009  // should usually be true. This only needs to be set to false if the lack of
4010  // odr-use cannot be determined from the current context (for instance,
4011  // because the name denotes a virtual function and was written without an
4012  // explicit nested-name-specifier).
4013  void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse);
4014  void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
4015  bool MightBeOdrUse = true);
4016  void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var);
4017  void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base = nullptr);
4018  void MarkMemberReferenced(MemberExpr *E);
4019 
4020  void UpdateMarkingForLValueToRValue(Expr *E);
4021  void CleanupVarDeclMarking();
4022 
4024  TryCapture_Implicit, TryCapture_ExplicitByVal, TryCapture_ExplicitByRef
4025  };
4026 
4027  /// \brief Try to capture the given variable.
4028  ///
4029  /// \param Var The variable to capture.
4030  ///
4031  /// \param Loc The location at which the capture occurs.
4032  ///
4033  /// \param Kind The kind of capture, which may be implicit (for either a
4034  /// block or a lambda), or explicit by-value or by-reference (for a lambda).
4035  ///
4036  /// \param EllipsisLoc The location of the ellipsis, if one is provided in
4037  /// an explicit lambda capture.
4038  ///
4039  /// \param BuildAndDiagnose Whether we are actually supposed to add the
4040  /// captures or diagnose errors. If false, this routine merely check whether
4041  /// the capture can occur without performing the capture itself or complaining
4042  /// if the variable cannot be captured.
4043  ///
4044  /// \param CaptureType Will be set to the type of the field used to capture
4045  /// this variable in the innermost block or lambda. Only valid when the
4046  /// variable can be captured.
4047  ///
4048  /// \param DeclRefType Will be set to the type of a reference to the capture
4049  /// from within the current scope. Only valid when the variable can be
4050  /// captured.
4051  ///
4052  /// \param FunctionScopeIndexToStopAt If non-null, it points to the index
4053  /// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
4054  /// This is useful when enclosing lambdas must speculatively capture
4055  /// variables that may or may not be used in certain specializations of
4056  /// a nested generic lambda.
4057  ///
4058  /// \returns true if an error occurred (i.e., the variable cannot be
4059  /// captured) and false if the capture succeeded.
4060  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
4061  SourceLocation EllipsisLoc, bool BuildAndDiagnose,
4062  QualType &CaptureType,
4063  QualType &DeclRefType,
4064  const unsigned *const FunctionScopeIndexToStopAt);
4065 
4066  /// \brief Try to capture the given variable.
4067  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
4068  TryCaptureKind Kind = TryCapture_Implicit,
4069  SourceLocation EllipsisLoc = SourceLocation());
4070 
4071  /// \brief Checks if the variable must be captured.
4072  bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);
4073 
4074  /// \brief Given a variable, determine the type that a reference to that
4075  /// variable will have in the given scope.
4076  QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);
4077 
4078  /// Mark all of the declarations referenced within a particular AST node as
4079  /// referenced. Used when template instantiation instantiates a non-dependent
4080  /// type -- entities referenced by the type are now referenced.
4081  void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T);
4082  void MarkDeclarationsReferencedInExpr(Expr *E,
4083  bool SkipLocalVariables = false);
4084 
4085  /// \brief Try to recover by turning the given expression into a
4086  /// call. Returns true if recovery was attempted or an error was
4087  /// emitted; this may also leave the ExprResult invalid.
4088  bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
4089  bool ForceComplain = false,
4090  bool (*IsPlausibleResult)(QualType) = nullptr);
4091 
4092  /// \brief Figure out if an expression could be turned into a call.
4093  bool tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
4094  UnresolvedSetImpl &NonTemplateOverloads);
4095 
4096  /// \brief Conditionally issue a diagnostic based on the current
4097  /// evaluation context.
4098  ///
4099  /// \param Statement If Statement is non-null, delay reporting the
4100  /// diagnostic until the function body is parsed, and then do a basic
4101  /// reachability analysis to determine if the statement is reachable.
4102  /// If it is unreachable, the diagnostic will not be emitted.
4103  bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
4104  const PartialDiagnostic &PD);
4105 
4106  // Primary Expressions.
4107  SourceRange getExprRange(Expr *E) const;
4108 
4109  ExprResult ActOnIdExpression(
4110  Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
4111  UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand,
4112  std::unique_ptr<CorrectionCandidateCallback> CCC = nullptr,
4113  bool IsInlineAsmIdentifier = false, Token *KeywordReplacement = nullptr);
4114 
4115  void DecomposeUnqualifiedId(const UnqualifiedId &Id,
4116  TemplateArgumentListInfo &Buffer,
4117  DeclarationNameInfo &NameInfo,
4118  const TemplateArgumentListInfo *&TemplateArgs);
4119 
4120  bool
4121  DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
4122  std::unique_ptr<CorrectionCandidateCallback> CCC,
4123  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr,
4124  ArrayRef<Expr *> Args = None, TypoExpr **Out = nullptr);
4125 
4126  ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S,
4127  IdentifierInfo *II,
4128  bool AllowBuiltinCreation=false);
4129 
4130  ExprResult ActOnDependentIdExpression(const CXXScopeSpec &SS,
4131  SourceLocation TemplateKWLoc,
4132  const DeclarationNameInfo &NameInfo,
4133  bool isAddressOfOperand,
4134  const TemplateArgumentListInfo *TemplateArgs);
4135 
4136  ExprResult BuildDeclRefExpr(ValueDecl *D, QualType Ty,
4137  ExprValueKind VK,
4138  SourceLocation Loc,
4139  const CXXScopeSpec *SS = nullptr);
4140  ExprResult
4141  BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
4142  const DeclarationNameInfo &NameInfo,
4143  const CXXScopeSpec *SS = nullptr,
4144  NamedDecl *FoundD = nullptr,
4145  const TemplateArgumentListInfo *TemplateArgs = nullptr);
4146  ExprResult
4147  BuildAnonymousStructUnionMemberReference(
4148  const CXXScopeSpec &SS,
4149  SourceLocation nameLoc,
4150  IndirectFieldDecl *indirectField,
4151  DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_none),
4152  Expr *baseObjectExpr = nullptr,
4153  SourceLocation opLoc = SourceLocation());
4154 
4155  ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
4156  SourceLocation TemplateKWLoc,
4157  LookupResult &R,
4158  const TemplateArgumentListInfo *TemplateArgs,
4159  const Scope *S);
4160  ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS,
4161  SourceLocation TemplateKWLoc,
4162  LookupResult &R,
4163  const TemplateArgumentListInfo *TemplateArgs,
4164  bool IsDefiniteInstance,
4165  const Scope *S);
4166  bool UseArgumentDependentLookup(const CXXScopeSpec &SS,
4167  const LookupResult &R,
4168  bool HasTrailingLParen);
4169 
4170  ExprResult
4171  BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
4172  const DeclarationNameInfo &NameInfo,
4173  bool IsAddressOfOperand, const Scope *S,
4174  TypeSourceInfo **RecoveryTSI = nullptr);
4175 
4176  ExprResult BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
4177  SourceLocation TemplateKWLoc,
4178  const DeclarationNameInfo &NameInfo,
4179  const TemplateArgumentListInfo *TemplateArgs);
4180 
4181  ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS,
4182  LookupResult &R,
4183  bool NeedsADL,
4184  bool AcceptInvalidDecl = false);
4185  ExprResult BuildDeclarationNameExpr(
4186  const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
4187  NamedDecl *FoundD = nullptr,
4188  const TemplateArgumentListInfo *TemplateArgs = nullptr,
4189  bool AcceptInvalidDecl = false);
4190 
4191  ExprResult BuildLiteralOperatorCall(LookupResult &R,
4192  DeclarationNameInfo &SuffixInfo,
4193  ArrayRef<Expr *> Args,
4194  SourceLocation LitEndLoc,
4195  TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr);
4196 
4197  ExprResult BuildPredefinedExpr(SourceLocation Loc,
4199  ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind);
4200  ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val);
4201 
4202  bool CheckLoopHintExpr(Expr *E, SourceLocation Loc);
4203 
4204  ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope = nullptr);
4205  ExprResult ActOnCharacterConstant(const Token &Tok,
4206  Scope *UDLScope = nullptr);
4207  ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E);
4208  ExprResult ActOnParenListExpr(SourceLocation L,
4209  SourceLocation R,
4210  MultiExprArg Val);
4211 
4212  /// ActOnStringLiteral - The specified tokens were lexed as pasted string
4213  /// fragments (e.g. "foo" "bar" L"baz").
4214  ExprResult ActOnStringLiteral(ArrayRef<Token> StringToks,
4215  Scope *UDLScope = nullptr);
4216 
4217  ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc,
4218  SourceLocation DefaultLoc,
4219  SourceLocation RParenLoc,
4220  Expr *ControllingExpr,
4221  ArrayRef<ParsedType> ArgTypes,
4222  ArrayRef<Expr *> ArgExprs);
4223  ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc,
4224  SourceLocation DefaultLoc,
4225  SourceLocation RParenLoc,
4226  Expr *ControllingExpr,
4228  ArrayRef<Expr *> Exprs);
4229 
4230  // Binary/Unary Operators. 'Tok' is the token for the operator.
4231  ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
4232  Expr *InputExpr);
4233  ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc,
4234  UnaryOperatorKind Opc, Expr *Input);
4235  ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
4236  tok::TokenKind Op, Expr *Input);
4237 
4238  QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc);
4239 
4240  ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
4241  SourceLocation OpLoc,
4242  UnaryExprOrTypeTrait ExprKind,
4243  SourceRange R);
4244  ExprResult CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
4245  UnaryExprOrTypeTrait ExprKind);
4246  ExprResult
4247  ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
4248  UnaryExprOrTypeTrait ExprKind,
4249  bool IsType, void *TyOrEx,
4250  SourceRange ArgRange);
4251 
4252  ExprResult CheckPlaceholderExpr(Expr *E);
4253  bool CheckVecStepExpr(Expr *E);
4254 
4255  bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind);
4256  bool CheckUnaryExprOrTypeTraitOperand(QualType ExprType, SourceLocation OpLoc,
4257  SourceRange ExprRange,
4258  UnaryExprOrTypeTrait ExprKind);
4259  ExprResult ActOnSizeofParameterPackExpr(Scope *S,
4260  SourceLocation OpLoc,
4261  IdentifierInfo &Name,
4262  SourceLocation NameLoc,
4263  SourceLocation RParenLoc);
4264  ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
4265  tok::TokenKind Kind, Expr *Input);
4266 
4267  ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
4268  Expr *Idx, SourceLocation RLoc);
4269  ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
4270  Expr *Idx, SourceLocation RLoc);
4271  ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
4272  Expr *LowerBound, SourceLocation ColonLoc,
4273  Expr *Length, SourceLocation RBLoc);
4274 
4275  // This struct is for use by ActOnMemberAccess to allow
4276  // BuildMemberReferenceExpr to be able to reinvoke ActOnMemberAccess after
4277  // changing the access operator from a '.' to a '->' (to see if that is the
4278  // change needed to fix an error about an unknown member, e.g. when the class
4279  // defines a custom operator->).
4281  Scope *S;
4284  };
4285 
4286  ExprResult BuildMemberReferenceExpr(
4287  Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow,
4288  CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
4289  NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo,
4290  const TemplateArgumentListInfo *TemplateArgs,
4291  const Scope *S,
4292  ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);
4293 
4294  ExprResult
4295  BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc,
4296  bool IsArrow, const CXXScopeSpec &SS,
4297  SourceLocation TemplateKWLoc,
4298  NamedDecl *FirstQualifierInScope, LookupResult &R,
4299  const TemplateArgumentListInfo *TemplateArgs,
4300  const Scope *S,
4301  bool SuppressQualifierCheck = false,
4302  ActOnMemberAccessExtraArgs *ExtraArgs = nullptr);
4303 
4304  ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
4305  SourceLocation OpLoc,
4306  const CXXScopeSpec &SS, FieldDecl *Field,
4307  DeclAccessPair FoundDecl,
4308  const DeclarationNameInfo &MemberNameInfo);
4309 
4310  ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow);
4311 
4312  bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType,
4313  const CXXScopeSpec &SS,
4314  const LookupResult &R);
4315 
4316  ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType,
4317  bool IsArrow, SourceLocation OpLoc,
4318  const CXXScopeSpec &SS,
4319  SourceLocation TemplateKWLoc,
4320  NamedDecl *FirstQualifierInScope,
4321  const DeclarationNameInfo &NameInfo,
4322  const TemplateArgumentListInfo *TemplateArgs);
4323 
4324  ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base,
4325  SourceLocation OpLoc,
4326  tok::TokenKind OpKind,
4327  CXXScopeSpec &SS,
4328  SourceLocation TemplateKWLoc,
4329  UnqualifiedId &Member,
4330  Decl *ObjCImpDecl);
4331 
4332  void ActOnDefaultCtorInitializers(Decl *CDtorDecl);
4333  bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
4334  FunctionDecl *FDecl,
4335  const FunctionProtoType *Proto,
4336  ArrayRef<Expr *> Args,
4337  SourceLocation RParenLoc,
4338  bool ExecConfig = false);
4339  void CheckStaticArrayArgument(SourceLocation CallLoc,
4340  ParmVarDecl *Param,
4341  const Expr *ArgExpr);
4342 
4343  /// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
4344  /// This provides the location of the left/right parens and a list of comma
4345  /// locations.
4346  ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
4347  MultiExprArg ArgExprs, SourceLocation RParenLoc,
4348  Expr *ExecConfig = nullptr,
4349  bool IsExecConfig = false);
4350  ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
4351  SourceLocation LParenLoc,
4352  ArrayRef<Expr *> Arg,
4353  SourceLocation RParenLoc,
4354  Expr *Config = nullptr,
4355  bool IsExecConfig = false);
4356 
4357  ExprResult ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
4358  MultiExprArg ExecConfig,
4359  SourceLocation GGGLoc);
4360 
4361  ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
4362  Declarator &D, ParsedType &Ty,
4363  SourceLocation RParenLoc, Expr *CastExpr);
4364  ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc,
4365  TypeSourceInfo *Ty,
4366  SourceLocation RParenLoc,
4367  Expr *Op);
4368  CastKind PrepareScalarCast(ExprResult &src, QualType destType);
4369 
4370  /// \brief Build an altivec or OpenCL literal.
4371  ExprResult BuildVectorLiteral(SourceLocation LParenLoc,
4372  SourceLocation RParenLoc, Expr *E,
4373  TypeSourceInfo *TInfo);
4374 
4375  ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME);
4376 
4377  ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc,
4378  ParsedType Ty,
4379  SourceLocation RParenLoc,
4380  Expr *InitExpr);
4381 
4382  ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc,
4383  TypeSourceInfo *TInfo,
4384  SourceLocation RParenLoc,
4385  Expr *LiteralExpr);
4386 
4387  ExprResult ActOnInitList(SourceLocation LBraceLoc,
4388  MultiExprArg InitArgList,
4389  SourceLocation RBraceLoc);
4390 
4391  ExprResult ActOnDesignatedInitializer(Designation &Desig,
4392  SourceLocation Loc,
4393  bool GNUSyntax,
4394  ExprResult Init);
4395 
4396 private:
4397  static BinaryOperatorKind ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind);
4398 
4399 public:
4400  ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc,
4401  tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr);
4402  ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc,
4403  BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr);
4404  ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc,
4405  Expr *LHSExpr, Expr *RHSExpr);
4406 
4407  void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc);
4408 
4409  /// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
4410  /// in the case of a the GNU conditional expr extension.
4411  ExprResult ActOnConditionalOp(SourceLocation QuestionLoc,
4412  SourceLocation ColonLoc,
4413  Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr);
4414 
4415  /// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
4416  ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
4417  LabelDecl *TheDecl);
4418 
4419  void ActOnStartStmtExpr();
4420  ExprResult ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
4421  SourceLocation RPLoc); // "({..})"
4422  void ActOnStmtExprError();
4423 
4424  // __builtin_offsetof(type, identifier(.identifier|[expr])*)
4427  bool isBrackets; // true if [expr], false if .ident
4428  union {
4431  } U;
4432  };
4433 
4434  /// __builtin_offsetof(type, a.b[123][456].c)
4435  ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
4436  TypeSourceInfo *TInfo,
4437  ArrayRef<OffsetOfComponent> Components,
4438  SourceLocation RParenLoc);
4439  ExprResult ActOnBuiltinOffsetOf(Scope *S,
4440  SourceLocation BuiltinLoc,
4442  ParsedType ParsedArgTy,
4443  ArrayRef<OffsetOfComponent> Components,
4444  SourceLocation RParenLoc);
4445 
4446  // __builtin_choose_expr(constExpr, expr1, expr2)
4447  ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc,
4448  Expr *CondExpr, Expr *LHSExpr,
4449  Expr *RHSExpr, SourceLocation RPLoc);
4450 
4451  // __builtin_va_arg(expr, type)
4452  ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
4453  SourceLocation RPLoc);
4454  ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E,
4455  TypeSourceInfo *TInfo, SourceLocation RPLoc);
4456 
4457  // __null
4458  ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc);
4459 
4460  bool CheckCaseExpression(Expr *E);
4461 
4462  /// \brief Describes the result of an "if-exists" condition check.
4464  /// \brief The symbol exists.
4466 
4467  /// \brief The symbol does not exist.
4469 
4470  /// \brief The name is a dependent name, so the results will differ
4471  /// from one instantiation to the next.
4473 
4474  /// \brief An error occurred.
4475  IER_Error
4476  };
4477 
4479  CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS,
4480  const DeclarationNameInfo &TargetNameInfo);
4481 
4483  CheckMicrosoftIfExistsSymbol(Scope *S, SourceLocation KeywordLoc,
4484  bool IsIfExists, CXXScopeSpec &SS,
4485  UnqualifiedId &Name);
4486 
4487  StmtResult BuildMSDependentExistsStmt(SourceLocation KeywordLoc,
4488  bool IsIfExists,
4489  NestedNameSpecifierLoc QualifierLoc,
4490  DeclarationNameInfo NameInfo,
4491  Stmt *Nested);
4492  StmtResult ActOnMSDependentExistsStmt(SourceLocation KeywordLoc,
4493  bool IsIfExists,
4494  CXXScopeSpec &SS, UnqualifiedId &Name,
4495  Stmt *Nested);
4496 
4497  //===------------------------- "Block" Extension ------------------------===//
4498 
4499  /// ActOnBlockStart - This callback is invoked when a block literal is
4500  /// started.
4501  void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope);
4502 
4503  /// ActOnBlockArguments - This callback allows processing of block arguments.
4504  /// If there are no arguments, this is still invoked.
4505  void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
4506  Scope *CurScope);
4507 
4508  /// ActOnBlockError - If there is an error parsing a block, this callback
4509  /// is invoked to pop the information about the block from the action impl.
4510  void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope);
4511 
4512  /// ActOnBlockStmtExpr - This is called when the body of a block statement
4513  /// literal was successfully completed. ^(int x){...}
4514  ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body,
4515  Scope *CurScope);
4516 
4517  //===---------------------------- Clang Extensions ----------------------===//
4518 
4519  /// __builtin_convertvector(...)
4520  ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
4521  SourceLocation BuiltinLoc,
4522  SourceLocation RParenLoc);
4523 
4524  //===---------------------------- OpenCL Features -----------------------===//
4525 
4526  /// __builtin_astype(...)
4527  ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
4528  SourceLocation BuiltinLoc,
4529  SourceLocation RParenLoc);
4530 
4531  //===---------------------------- C++ Features --------------------------===//
4532 
4533  // Act on C++ namespaces
4534  Decl *ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc,
4535  SourceLocation NamespaceLoc,
4536  SourceLocation IdentLoc,
4537  IdentifierInfo *Ident,
4538  SourceLocation LBrace,
4539  AttributeList *AttrList,
4541  void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace);
4542 
4543  NamespaceDecl *getStdNamespace() const;
4544  NamespaceDecl *getOrCreateStdNamespace();
4545 
4546  NamespaceDecl *lookupStdExperimentalNamespace();
4547 
4548  CXXRecordDecl *getStdBadAlloc() const;
4549  EnumDecl *getStdAlignValT() const;
4550 
4551  /// \brief Tests whether Ty is an instance of std::initializer_list and, if
4552  /// it is and Element is not NULL, assigns the element type to Element.
4553  bool isStdInitializerList(QualType Ty, QualType *Element);
4554 
4555  /// \brief Looks for the std::initializer_list template and instantiates it
4556  /// with Element, or emits an error if it's not found.
4557  ///
4558  /// \returns The instantiated template, or null on error.
4559  QualType BuildStdInitializerList(QualType Element, SourceLocation Loc);
4560 
4561  /// \brief Determine whether Ctor is an initializer-list constructor, as
4562  /// defined in [dcl.init.list]p2.
4563  bool isInitListConstructor(const FunctionDecl *Ctor);
4564 
4565  Decl *ActOnUsingDirective(Scope *CurScope,
4566  SourceLocation UsingLoc,
4567  SourceLocation NamespcLoc,
4568  CXXScopeSpec &SS,
4569  SourceLocation IdentLoc,
4570  IdentifierInfo *NamespcName,
4571  AttributeList *AttrList);
4572 
4573  void PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir);
4574 
4575  Decl *ActOnNamespaceAliasDef(Scope *CurScope,
4576  SourceLocation NamespaceLoc,
4577  SourceLocation AliasLoc,
4578  IdentifierInfo *Alias,
4579  CXXScopeSpec &SS,
4580  SourceLocation IdentLoc,
4581  IdentifierInfo *Ident);
4582 
4583  void HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow);
4584  bool CheckUsingShadowDecl(UsingDecl *UD, NamedDecl *Target,
4585  const LookupResult &PreviousDecls,
4586  UsingShadowDecl *&PrevShadow);
4587  UsingShadowDecl *BuildUsingShadowDecl(Scope *S, UsingDecl *UD,
4588  NamedDecl *Target,
4589  UsingShadowDecl *PrevDecl);
4590 
4591  bool CheckUsingDeclRedeclaration(SourceLocation UsingLoc,
4592  bool HasTypenameKeyword,
4593  const CXXScopeSpec &SS,
4594  SourceLocation NameLoc,
4595  const LookupResult &Previous);
4596  bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
4597  bool HasTypename,
4598  const CXXScopeSpec &SS,
4599  const DeclarationNameInfo &NameInfo,
4600  SourceLocation NameLoc);
4601 
4602  NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
4603  SourceLocation UsingLoc,
4604  bool HasTypenameKeyword,
4605  SourceLocation TypenameLoc,
4606  CXXScopeSpec &SS,
4607  DeclarationNameInfo NameInfo,
4608  SourceLocation EllipsisLoc,
4609  AttributeList *AttrList,
4610  bool IsInstantiation);
4611  NamedDecl *BuildUsingPackDecl(NamedDecl *InstantiatedFrom,
4612  ArrayRef<NamedDecl *> Expansions);
4613 
4614  bool CheckInheritingConstructorUsingDecl(UsingDecl *UD);
4615 
4616  /// Given a derived-class using shadow declaration for a constructor and the
4617  /// correspnding base class constructor, find or create the implicit
4618  /// synthesized derived class constructor to use for this initialization.
4619  CXXConstructorDecl *
4620  findInheritingConstructor(SourceLocation Loc, CXXConstructorDecl *BaseCtor,
4621  ConstructorUsingShadowDecl *DerivedShadow);
4622 
4623  Decl *ActOnUsingDeclaration(Scope *CurScope,
4624  AccessSpecifier AS,
4625  SourceLocation UsingLoc,
4626  SourceLocation TypenameLoc,
4627  CXXScopeSpec &SS,
4628  UnqualifiedId &Name,
4629  SourceLocation EllipsisLoc,
4630  AttributeList *AttrList);
4631  Decl *ActOnAliasDeclaration(Scope *CurScope,
4632  AccessSpecifier AS,
4633  MultiTemplateParamsArg TemplateParams,
4634  SourceLocation UsingLoc,
4635  UnqualifiedId &Name,
4636  AttributeList *AttrList,
4637  TypeResult Type,
4638  Decl *DeclFromDeclSpec);
4639 
4640  /// BuildCXXConstructExpr - Creates a complete call to a constructor,
4641  /// including handling of its default argument expressions.
4642  ///
4643  /// \param ConstructKind - a CXXConstructExpr::ConstructionKind
4644  ExprResult
4645  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4646  NamedDecl *FoundDecl,
4647  CXXConstructorDecl *Constructor, MultiExprArg Exprs,
4648  bool HadMultipleCandidates, bool IsListInitialization,
4649  bool IsStdInitListInitialization,
4650  bool RequiresZeroInit, unsigned ConstructKind,
4651  SourceRange ParenRange);
4652 
4653  /// Build a CXXConstructExpr whose constructor has already been resolved if
4654  /// it denotes an inherited constructor.
4655  ExprResult
4656  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4657  CXXConstructorDecl *Constructor, bool Elidable,
4658  MultiExprArg Exprs,
4659  bool HadMultipleCandidates, bool IsListInitialization,
4660  bool IsStdInitListInitialization,
4661  bool RequiresZeroInit, unsigned ConstructKind,
4662  SourceRange ParenRange);
4663 
4664  // FIXME: Can we remove this and have the above BuildCXXConstructExpr check if
4665  // the constructor can be elidable?
4666  ExprResult
4667  BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType,
4668  NamedDecl *FoundDecl,
4669  CXXConstructorDecl *Constructor, bool Elidable,
4670  MultiExprArg Exprs, bool HadMultipleCandidates,
4671  bool IsListInitialization,
4672  bool IsStdInitListInitialization, bool RequiresZeroInit,
4673  unsigned ConstructKind, SourceRange ParenRange);
4674 
4675  ExprResult BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field);
4676 
4677 
4678  /// Instantiate or parse a C++ default argument expression as necessary.
4679  /// Return true on error.
4680  bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
4681  ParmVarDecl *Param);
4682 
4683  /// BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating
4684  /// the default expr if needed.
4685  ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc,
4686  FunctionDecl *FD,
4687  ParmVarDecl *Param);
4688 
4689  /// FinalizeVarWithDestructor - Prepare for calling destructor on the
4690  /// constructed variable.
4691  void FinalizeVarWithDestructor(VarDecl *VD, const RecordType *DeclInitType);
4692 
4693  /// \brief Helper class that collects exception specifications for
4694  /// implicitly-declared special member functions.
4696  // Pointer to allow copying
4697  Sema *Self;
4698  // We order exception specifications thus:
4699  // noexcept is the most restrictive, but is only used in C++11.
4700  // throw() comes next.
4701  // Then a throw(collected exceptions)
4702  // Finally no specification, which is expressed as noexcept(false).
4703  // throw(...) is used instead if any called function uses it.
4704  ExceptionSpecificationType ComputedEST;
4705  llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen;
4706  SmallVector<QualType, 4> Exceptions;
4707 
4708  void ClearExceptions() {
4709  ExceptionsSeen.clear();
4710  Exceptions.clear();
4711  }
4712 
4713  public:
4715  : Self(&Self), ComputedEST(EST_BasicNoexcept) {
4716  if (!Self.getLangOpts().CPlusPlus11)
4717  ComputedEST = EST_DynamicNone;
4718  }
4719 
4720  /// \brief Get the computed exception specification type.
4722  assert(ComputedEST != EST_ComputedNoexcept &&
4723  "noexcept(expr) should not be a possible result");
4724  return ComputedEST;
4725  }
4726 
4727  /// \brief The number of exceptions in the exception specification.
4728  unsigned size() const { return Exceptions.size(); }
4729 
4730  /// \brief The set of exceptions in the exception specification.
4731  const QualType *data() const { return Exceptions.data(); }
4732 
4733  /// \brief Integrate another called method into the collected data.
4734  void CalledDecl(SourceLocation CallLoc, const CXXMethodDecl *Method);
4735 
4736  /// \brief Integrate an invoked expression into the collected data.
4737  void CalledExpr(Expr *E);
4738 
4739  /// \brief Overwrite an EPI's exception specification with this
4740  /// computed exception specification.
4743  ESI.Type = getExceptionSpecType();
4744  if (ESI.Type == EST_Dynamic) {
4745  ESI.Exceptions = Exceptions;
4746  } else if (ESI.Type == EST_None) {
4747  /// C++11 [except.spec]p14:
4748  /// The exception-specification is noexcept(false) if the set of
4749  /// potential exceptions of the special member function contains "any"
4750  ESI.Type = EST_ComputedNoexcept;
4752  tok::kw_false).get();
4753  }
4754  return ESI;
4755  }
4756  };
4757 
4758  /// \brief Determine what sort of exception specification a defaulted
4759  /// copy constructor of a class will have.
4761  ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc,
4762  CXXMethodDecl *MD);
4763 
4764  /// \brief Determine what sort of exception specification a defaulted
4765  /// default constructor of a class will have, and whether the parameter
4766  /// will be const.
4768  ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD);
4769 
4770  /// \brief Determine what sort of exception specification a defautled
4771  /// copy assignment operator of a class will have, and whether the
4772  /// parameter will be const.
4774  ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD);
4775 
4776  /// \brief Determine what sort of exception specification a defaulted move
4777  /// constructor of a class will have.
4779  ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD);
4780 
4781  /// \brief Determine what sort of exception specification a defaulted move
4782  /// assignment operator of a class will have.
4784  ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD);
4785 
4786  /// \brief Determine what sort of exception specification a defaulted
4787  /// destructor of a class will have.
4789  ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD);
4790 
4791  /// \brief Determine what sort of exception specification an inheriting
4792  /// constructor of a class will have.
4794  ComputeInheritingCtorExceptionSpec(SourceLocation Loc,
4795  CXXConstructorDecl *CD);
4796 
4797  /// \brief Evaluate the implicit exception specification for a defaulted
4798  /// special member function.
4799  void EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD);
4800 
4801  /// \brief Check the given exception-specification and update the
4802  /// exception specification information with the results.
4803  void checkExceptionSpecification(bool IsTopLevel,
4805  ArrayRef<ParsedType> DynamicExceptions,
4806  ArrayRef<SourceRange> DynamicExceptionRanges,
4807  Expr *NoexceptExpr,
4808  SmallVectorImpl<QualType> &Exceptions,
4810 
4811  /// \brief Determine if we're in a case where we need to (incorrectly) eagerly
4812  /// parse an exception specification to work around a libstdc++ bug.
4813  bool isLibstdcxxEagerExceptionSpecHack(const Declarator &D);
4814 
4815  /// \brief Add an exception-specification to the given member function
4816  /// (or member function template). The exception-specification was parsed
4817  /// after the method itself was declared.
4818  void actOnDelayedExceptionSpecification(Decl *Method,
4820  SourceRange SpecificationRange,
4821  ArrayRef<ParsedType> DynamicExceptions,
4822  ArrayRef<SourceRange> DynamicExceptionRanges,
4823  Expr *NoexceptExpr);
4824 
4826 
4827  /// \brief Determine if a special member function should have a deleted
4828  /// definition when it is defaulted.
4829  bool ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM,
4830  InheritedConstructorInfo *ICI = nullptr,
4831  bool Diagnose = false);
4832 
4833  /// \brief Declare the implicit default constructor for the given class.
4834  ///
4835  /// \param ClassDecl The class declaration into which the implicit
4836  /// default constructor will be added.
4837  ///
4838  /// \returns The implicitly-declared default constructor.
4839  CXXConstructorDecl *DeclareImplicitDefaultConstructor(
4840  CXXRecordDecl *ClassDecl);
4841 
4842  /// DefineImplicitDefaultConstructor - Checks for feasibility of
4843  /// defining this constructor as the default constructor.
4844  void DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
4845  CXXConstructorDecl *Constructor);
4846 
4847  /// \brief Declare the implicit destructor for the given class.
4848  ///
4849  /// \param ClassDecl The class declaration into which the implicit
4850  /// destructor will be added.
4851  ///
4852  /// \returns The implicitly-declared destructor.
4853  CXXDestructorDecl *DeclareImplicitDestructor(CXXRecordDecl *ClassDecl);
4854 
4855  /// DefineImplicitDestructor - Checks for feasibility of
4856  /// defining this destructor as the default destructor.
4857  void DefineImplicitDestructor(SourceLocation CurrentLocation,
4858  CXXDestructorDecl *Destructor);
4859 
4860  /// \brief Build an exception spec for destructors that don't have one.
4861  ///
4862  /// C++11 says that user-defined destructors with no exception spec get one
4863  /// that looks as if the destructor was implicitly declared.
4864  void AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl,
4865  CXXDestructorDecl *Destructor);
4866 
4867  /// \brief Define the specified inheriting constructor.
4868  void DefineInheritingConstructor(SourceLocation UseLoc,
4869  CXXConstructorDecl *Constructor);
4870 
4871  /// \brief Declare the implicit copy constructor for the given class.
4872  ///
4873  /// \param ClassDecl The class declaration into which the implicit
4874  /// copy constructor will be added.
4875  ///
4876  /// \returns The implicitly-declared copy constructor.
4877  CXXConstructorDecl *DeclareImplicitCopyConstructor(CXXRecordDecl *ClassDecl);
4878 
4879  /// DefineImplicitCopyConstructor - Checks for feasibility of
4880  /// defining this constructor as the copy constructor.
4881  void DefineImplicitCopyConstructor(SourceLocation CurrentLocation,
4882  CXXConstructorDecl *Constructor);
4883 
4884  /// \brief Declare the implicit move constructor for the given class.
4885  ///
4886  /// \param ClassDecl The Class declaration into which the implicit
4887  /// move constructor will be added.
4888  ///
4889  /// \returns The implicitly-declared move constructor, or NULL if it wasn't
4890  /// declared.
4891  CXXConstructorDecl *DeclareImplicitMoveConstructor(CXXRecordDecl *ClassDecl);
4892 
4893  /// DefineImplicitMoveConstructor - Checks for feasibility of
4894  /// defining this constructor as the move constructor.
4895  void DefineImplicitMoveConstructor(SourceLocation CurrentLocation,
4896  CXXConstructorDecl *Constructor);
4897 
4898  /// \brief Declare the implicit copy assignment operator for the given class.
4899  ///
4900  /// \param ClassDecl The class declaration into which the implicit
4901  /// copy assignment operator will be added.
4902  ///
4903  /// \returns The implicitly-declared copy assignment operator.
4904  CXXMethodDecl *DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl);
4905 
4906  /// \brief Defines an implicitly-declared copy assignment operator.
4907  void DefineImplicitCopyAssignment(SourceLocation CurrentLocation,
4908  CXXMethodDecl *MethodDecl);
4909 
4910  /// \brief Declare the implicit move assignment operator for the given class.
4911  ///
4912  /// \param ClassDecl The Class declaration into which the implicit
4913  /// move assignment operator will be added.
4914  ///
4915  /// \returns The implicitly-declared move assignment operator, or NULL if it
4916  /// wasn't declared.
4917  CXXMethodDecl *DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl);
4918 
4919  /// \brief Defines an implicitly-declared move assignment operator.
4920  void DefineImplicitMoveAssignment(SourceLocation CurrentLocation,
4921  CXXMethodDecl *MethodDecl);
4922 
4923  /// \brief Force the declaration of any implicitly-declared members of this
4924  /// class.
4925  void ForceDeclarationOfImplicitMembers(CXXRecordDecl *Class);
4926 
4927  /// \brief Check a completed declaration of an implicit special member.
4928  void CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD);
4929 
4930  /// \brief Determine whether the given function is an implicitly-deleted
4931  /// special member function.
4932  bool isImplicitlyDeleted(FunctionDecl *FD);
4933 
4934  /// \brief Check whether 'this' shows up in the type of a static member
4935  /// function after the (naturally empty) cv-qualifier-seq would be.
4936  ///
4937  /// \returns true if an error occurred.
4938  bool checkThisInStaticMemberFunctionType(CXXMethodDecl *Method);
4939 
4940  /// \brief Whether this' shows up in the exception specification of a static
4941  /// member function.
4942  bool checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method);
4943 
4944  /// \brief Check whether 'this' shows up in the attributes of the given
4945  /// static member function.
4946  ///
4947  /// \returns true if an error occurred.
4948  bool checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method);
4949 
4950  /// MaybeBindToTemporary - If the passed in expression has a record type with
4951  /// a non-trivial destructor, this will return CXXBindTemporaryExpr. Otherwise
4952  /// it simply returns the passed in expression.
4953  ExprResult MaybeBindToTemporary(Expr *E);
4954 
4955  bool CompleteConstructorCall(CXXConstructorDecl *Constructor,
4956  MultiExprArg ArgsPtr,
4957  SourceLocation Loc,
4958  SmallVectorImpl<Expr*> &ConvertedArgs,
4959  bool AllowExplicit = false,
4960  bool IsListInitialization = false);
4961 
4962  ParsedType getInheritingConstructorName(CXXScopeSpec &SS,
4963  SourceLocation NameLoc,
4964  IdentifierInfo &Name);
4965 
4966  ParsedType getDestructorName(SourceLocation TildeLoc,
4967  IdentifierInfo &II, SourceLocation NameLoc,
4968  Scope *S, CXXScopeSpec &SS,
4969  ParsedType ObjectType,
4970  bool EnteringContext);
4971 
4972  ParsedType getDestructorTypeForDecltype(const DeclSpec &DS,
4973  ParsedType ObjectType);
4974 
4975  // Checks that reinterpret casts don't have undefined behavior.
4976  void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
4977  bool IsDereference, SourceRange Range);
4978 
4979  /// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
4980  ExprResult ActOnCXXNamedCast(SourceLocation OpLoc,
4982  SourceLocation LAngleBracketLoc,
4983  Declarator &D,
4984  SourceLocation RAngleBracketLoc,
4985  SourceLocation LParenLoc,
4986  Expr *E,
4987  SourceLocation RParenLoc);
4988 
4989  ExprResult BuildCXXNamedCast(SourceLocation OpLoc,
4990  tok::TokenKind Kind,
4991  TypeSourceInfo *Ty,
4992  Expr *E,
4993  SourceRange AngleBrackets,
4994  SourceRange Parens);
4995 
4996  ExprResult BuildCXXTypeId(QualType TypeInfoType,
4997  SourceLocation TypeidLoc,
4998  TypeSourceInfo *Operand,
4999  SourceLocation RParenLoc);
5000  ExprResult BuildCXXTypeId(QualType TypeInfoType,
5001  SourceLocation TypeidLoc,
5002  Expr *Operand,
5003  SourceLocation RParenLoc);
5004 
5005  /// ActOnCXXTypeid - Parse typeid( something ).
5006  ExprResult ActOnCXXTypeid(SourceLocation OpLoc,
5007  SourceLocation LParenLoc, bool isType,
5008  void *TyOrExpr,
5009  SourceLocation RParenLoc);
5010 
5011  ExprResult BuildCXXUuidof(QualType TypeInfoType,
5012  SourceLocation TypeidLoc,
5013  TypeSourceInfo *Operand,
5014  SourceLocation RParenLoc);
5015  ExprResult BuildCXXUuidof(QualType TypeInfoType,
5016  SourceLocation TypeidLoc,
5017  Expr *Operand,
5018  SourceLocation RParenLoc);
5019 
5020  /// ActOnCXXUuidof - Parse __uuidof( something ).
5021  ExprResult ActOnCXXUuidof(SourceLocation OpLoc,
5022  SourceLocation LParenLoc, bool isType,
5023  void *TyOrExpr,
5024  SourceLocation RParenLoc);
5025 
5026  /// \brief Handle a C++1z fold-expression: ( expr op ... op expr ).
5027  ExprResult ActOnCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
5028  tok::TokenKind Operator,
5029  SourceLocation EllipsisLoc, Expr *RHS,
5030  SourceLocation RParenLoc);
5031  ExprResult BuildCXXFoldExpr(SourceLocation LParenLoc, Expr *LHS,
5032  BinaryOperatorKind Operator,
5033  SourceLocation EllipsisLoc, Expr *RHS,
5034  SourceLocation RParenLoc);
5035  ExprResult BuildEmptyCXXFoldExpr(SourceLocation EllipsisLoc,
5036  BinaryOperatorKind Operator);
5037 
5038  //// ActOnCXXThis - Parse 'this' pointer.
5039  ExprResult ActOnCXXThis(SourceLocation loc);
5040 
5041  /// \brief Try to retrieve the type of the 'this' pointer.
5042  ///
5043  /// \returns The type of 'this', if possible. Otherwise, returns a NULL type.
5044  QualType getCurrentThisType();
5045 
5046  /// \brief When non-NULL, the C++ 'this' expression is allowed despite the
5047  /// current context not being a non-static member function. In such cases,
5048  /// this provides the type used for 'this'.
5050 
5051  /// \brief RAII object used to temporarily allow the C++ 'this' expression
5052  /// to be used, with the given qualifiers on the current class type.
5054  Sema &S;
5055  QualType OldCXXThisTypeOverride;
5056  bool Enabled;
5057 
5058  public:
5059  /// \brief Introduce a new scope where 'this' may be allowed (when enabled),
5060  /// using the given declaration (which is either a class template or a
5061  /// class) along with the given qualifiers.
5062  /// along with the qualifiers placed on '*this'.
5063  CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
5064  bool Enabled = true);
5065 
5066  ~CXXThisScopeRAII();
5067  };
5068 
5069  /// \brief Make sure the value of 'this' is actually available in the current
5070  /// context, if it is a potentially evaluated context.
5071  ///
5072  /// \param Loc The location at which the capture of 'this' occurs.
5073  ///
5074  /// \param Explicit Whether 'this' is explicitly captured in a lambda
5075  /// capture list.
5076  ///
5077  /// \param FunctionScopeIndexToStopAt If non-null, it points to the index
5078  /// of the FunctionScopeInfo stack beyond which we do not attempt to capture.
5079  /// This is useful when enclosing lambdas must speculatively capture
5080  /// 'this' that may or may not be used in certain specializations of
5081  /// a nested generic lambda (depending on whether the name resolves to
5082  /// a non-static member function or a static function).
5083  /// \return returns 'true' if failed, 'false' if success.
5084  bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit = false,
5085  bool BuildAndDiagnose = true,
5086  const unsigned *const FunctionScopeIndexToStopAt = nullptr,
5087  bool ByCopy = false);
5088 
5089  /// \brief Determine whether the given type is the type of *this that is used
5090  /// outside of the body of a member function for a type that is currently
5091  /// being defined.
5092  bool isThisOutsideMemberFunctionBody(QualType BaseType);
5093 
5094  /// ActOnCXXBoolLiteral - Parse {true,false} literals.
5095  ExprResult ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
5096 
5097 
5098  /// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
5099  ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind);
5100 
5101  ExprResult
5102  ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef<AvailabilitySpec> AvailSpecs,
5103  SourceLocation AtLoc, SourceLocation RParen);
5104 
5105  /// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
5106  ExprResult ActOnCXXNullPtrLiteral(SourceLocation Loc);
5107 
5108  //// ActOnCXXThrow - Parse throw expressions.
5109  ExprResult ActOnCXXThrow(Scope *S, SourceLocation OpLoc, Expr *expr);
5110  ExprResult BuildCXXThrow(SourceLocation OpLoc, Expr *Ex,
5111  bool IsThrownVarInScope);
5112  bool CheckCXXThrowOperand(SourceLocation ThrowLoc, QualType ThrowTy, Expr *E);
5113 
5114  /// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
5115  /// Can be interpreted either as function-style casting ("int(x)")
5116  /// or class type construction ("ClassType(x,y,z)")
5117  /// or creation of a value-initialized type ("int()").
5118  ExprResult ActOnCXXTypeConstructExpr(ParsedType TypeRep,
5119  SourceLocation LParenOrBraceLoc,
5120  MultiExprArg Exprs,
5121  SourceLocation RParenOrBraceLoc,
5122  bool ListInitialization);
5123 
5124  ExprResult BuildCXXTypeConstructExpr(TypeSourceInfo *Type,
5125  SourceLocation LParenLoc,
5126  MultiExprArg Exprs,
5127  SourceLocation RParenLoc,
5128  bool ListInitialization);
5129 
5130  /// ActOnCXXNew - Parsed a C++ 'new' expression.
5131  ExprResult ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
5132  SourceLocation PlacementLParen,
5133  MultiExprArg PlacementArgs,
5134  SourceLocation PlacementRParen,
5135  SourceRange TypeIdParens, Declarator &D,
5136  Expr *Initializer);
5137  ExprResult BuildCXXNew(SourceRange Range, bool UseGlobal,
5138  SourceLocation PlacementLParen,
5139  MultiExprArg PlacementArgs,
5140  SourceLocation PlacementRParen,
5141  SourceRange TypeIdParens,
5142  QualType AllocType,
5143  TypeSourceInfo *AllocTypeInfo,
5144  Expr *ArraySize,
5145  SourceRange DirectInitRange,
5146  Expr *Initializer);
5147 
5148  bool CheckAllocatedType(QualType AllocType, SourceLocation Loc,
5149  SourceRange R);
5150  bool FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
5151  bool UseGlobal, QualType AllocType, bool IsArray,
5152  bool &PassAlignment, MultiExprArg PlaceArgs,
5153  FunctionDecl *&OperatorNew,
5154  FunctionDecl *&OperatorDelete,
5155  bool Diagnose = true);
5156  void DeclareGlobalNewDelete();
5157  void DeclareGlobalAllocationFunction(DeclarationName Name, QualType Return,
5158  ArrayRef<QualType> Params);
5159 
5160  bool FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
5161  DeclarationName Name, FunctionDecl* &Operator,
5162  bool Diagnose = true);
5163  FunctionDecl *FindUsualDeallocationFunction(SourceLocation StartLoc,
5164  bool CanProvideSize,
5165  bool Overaligned,
5166  DeclarationName Name);
5167  FunctionDecl *FindDeallocationFunctionForDestructor(SourceLocation StartLoc,
5168  CXXRecordDecl *RD);
5169 
5170  /// ActOnCXXDelete - Parsed a C++ 'delete' expression
5171  ExprResult ActOnCXXDelete(SourceLocation StartLoc,
5172  bool UseGlobal, bool ArrayForm,
5173  Expr *Operand);
5174  void CheckVirtualDtorCall(CXXDestructorDecl *dtor, SourceLocation Loc,
5175  bool IsDelete, bool CallCanBeVirtual,
5176  bool WarnOnNonAbstractTypes,
5177  SourceLocation DtorLoc);
5178 
5179  ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
5180  Expr *Operand, SourceLocation RParen);
5181  ExprResult BuildCXXNoexceptExpr(