clang  8.0.0svn
SemaExprMember.cpp
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1 //===--- SemaExprMember.cpp - Semantic Analysis for Expressions -----------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements semantic analysis member access expressions.
11 //
12 //===----------------------------------------------------------------------===//
13 #include "clang/Sema/Overload.h"
14 #include "clang/AST/ASTLambda.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/AST/ExprCXX.h"
19 #include "clang/AST/ExprObjC.h"
20 #include "clang/Lex/Preprocessor.h"
21 #include "clang/Sema/Lookup.h"
22 #include "clang/Sema/Scope.h"
23 #include "clang/Sema/ScopeInfo.h"
25 
26 using namespace clang;
27 using namespace sema;
28 
29 typedef llvm::SmallPtrSet<const CXXRecordDecl*, 4> BaseSet;
30 
31 /// Determines if the given class is provably not derived from all of
32 /// the prospective base classes.
33 static bool isProvablyNotDerivedFrom(Sema &SemaRef, CXXRecordDecl *Record,
34  const BaseSet &Bases) {
35  auto BaseIsNotInSet = [&Bases](const CXXRecordDecl *Base) {
36  return !Bases.count(Base->getCanonicalDecl());
37  };
38  return BaseIsNotInSet(Record) && Record->forallBases(BaseIsNotInSet);
39 }
40 
41 enum IMAKind {
42  /// The reference is definitely not an instance member access.
44 
45  /// The reference may be an implicit instance member access.
47 
48  /// The reference may be to an instance member, but it might be invalid if
49  /// so, because the context is not an instance method.
51 
52  /// The reference may be to an instance member, but it is invalid if
53  /// so, because the context is from an unrelated class.
55 
56  /// The reference is definitely an implicit instance member access.
58 
59  /// The reference may be to an unresolved using declaration.
61 
62  /// The reference is a contextually-permitted abstract member reference.
64 
65  /// The reference may be to an unresolved using declaration and the
66  /// context is not an instance method.
68 
69  // The reference refers to a field which is not a member of the containing
70  // class, which is allowed because we're in C++11 mode and the context is
71  // unevaluated.
73 
74  /// All possible referrents are instance members and the current
75  /// context is not an instance method.
77 
78  /// All possible referrents are instance members of an unrelated
79  /// class.
81 };
82 
83 /// The given lookup names class member(s) and is not being used for
84 /// an address-of-member expression. Classify the type of access
85 /// according to whether it's possible that this reference names an
86 /// instance member. This is best-effort in dependent contexts; it is okay to
87 /// conservatively answer "yes", in which case some errors will simply
88 /// not be caught until template-instantiation.
90  const LookupResult &R) {
91  assert(!R.empty() && (*R.begin())->isCXXClassMember());
92 
94 
95  bool isStaticContext = SemaRef.CXXThisTypeOverride.isNull() &&
96  (!isa<CXXMethodDecl>(DC) || cast<CXXMethodDecl>(DC)->isStatic());
97 
98  if (R.isUnresolvableResult())
99  return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
100 
101  // Collect all the declaring classes of instance members we find.
102  bool hasNonInstance = false;
103  bool isField = false;
104  BaseSet Classes;
105  for (NamedDecl *D : R) {
106  // Look through any using decls.
107  D = D->getUnderlyingDecl();
108 
109  if (D->isCXXInstanceMember()) {
110  isField |= isa<FieldDecl>(D) || isa<MSPropertyDecl>(D) ||
111  isa<IndirectFieldDecl>(D);
112 
113  CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
114  Classes.insert(R->getCanonicalDecl());
115  } else
116  hasNonInstance = true;
117  }
118 
119  // If we didn't find any instance members, it can't be an implicit
120  // member reference.
121  if (Classes.empty())
122  return IMA_Static;
123 
124  // C++11 [expr.prim.general]p12:
125  // An id-expression that denotes a non-static data member or non-static
126  // member function of a class can only be used:
127  // (...)
128  // - if that id-expression denotes a non-static data member and it
129  // appears in an unevaluated operand.
130  //
131  // This rule is specific to C++11. However, we also permit this form
132  // in unevaluated inline assembly operands, like the operand to a SIZE.
133  IMAKind AbstractInstanceResult = IMA_Static; // happens to be 'false'
134  assert(!AbstractInstanceResult);
135  switch (SemaRef.ExprEvalContexts.back().Context) {
138  if (isField && SemaRef.getLangOpts().CPlusPlus11)
139  AbstractInstanceResult = IMA_Field_Uneval_Context;
140  break;
141 
143  AbstractInstanceResult = IMA_Abstract;
144  break;
145 
150  break;
151  }
152 
153  // If the current context is not an instance method, it can't be
154  // an implicit member reference.
155  if (isStaticContext) {
156  if (hasNonInstance)
158 
159  return AbstractInstanceResult ? AbstractInstanceResult
161  }
162 
163  CXXRecordDecl *contextClass;
164  if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC))
165  contextClass = MD->getParent()->getCanonicalDecl();
166  else
167  contextClass = cast<CXXRecordDecl>(DC);
168 
169  // [class.mfct.non-static]p3:
170  // ...is used in the body of a non-static member function of class X,
171  // if name lookup (3.4.1) resolves the name in the id-expression to a
172  // non-static non-type member of some class C [...]
173  // ...if C is not X or a base class of X, the class member access expression
174  // is ill-formed.
175  if (R.getNamingClass() &&
176  contextClass->getCanonicalDecl() !=
177  R.getNamingClass()->getCanonicalDecl()) {
178  // If the naming class is not the current context, this was a qualified
179  // member name lookup, and it's sufficient to check that we have the naming
180  // class as a base class.
181  Classes.clear();
182  Classes.insert(R.getNamingClass()->getCanonicalDecl());
183  }
184 
185  // If we can prove that the current context is unrelated to all the
186  // declaring classes, it can't be an implicit member reference (in
187  // which case it's an error if any of those members are selected).
188  if (isProvablyNotDerivedFrom(SemaRef, contextClass, Classes))
189  return hasNonInstance ? IMA_Mixed_Unrelated :
190  AbstractInstanceResult ? AbstractInstanceResult :
192 
193  return (hasNonInstance ? IMA_Mixed : IMA_Instance);
194 }
195 
196 /// Diagnose a reference to a field with no object available.
197 static void diagnoseInstanceReference(Sema &SemaRef,
198  const CXXScopeSpec &SS,
199  NamedDecl *Rep,
200  const DeclarationNameInfo &nameInfo) {
201  SourceLocation Loc = nameInfo.getLoc();
202  SourceRange Range(Loc);
203  if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
204 
205  // Look through using shadow decls and aliases.
206  Rep = Rep->getUnderlyingDecl();
207 
208  DeclContext *FunctionLevelDC = SemaRef.getFunctionLevelDeclContext();
209  CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FunctionLevelDC);
210  CXXRecordDecl *ContextClass = Method ? Method->getParent() : nullptr;
211  CXXRecordDecl *RepClass = dyn_cast<CXXRecordDecl>(Rep->getDeclContext());
212 
213  bool InStaticMethod = Method && Method->isStatic();
214  bool IsField = isa<FieldDecl>(Rep) || isa<IndirectFieldDecl>(Rep);
215 
216  if (IsField && InStaticMethod)
217  // "invalid use of member 'x' in static member function"
218  SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
219  << Range << nameInfo.getName();
220  else if (ContextClass && RepClass && SS.isEmpty() && !InStaticMethod &&
221  !RepClass->Equals(ContextClass) && RepClass->Encloses(ContextClass))
222  // Unqualified lookup in a non-static member function found a member of an
223  // enclosing class.
224  SemaRef.Diag(Loc, diag::err_nested_non_static_member_use)
225  << IsField << RepClass << nameInfo.getName() << ContextClass << Range;
226  else if (IsField)
227  SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
228  << nameInfo.getName() << Range;
229  else
230  SemaRef.Diag(Loc, diag::err_member_call_without_object)
231  << Range;
232 }
233 
234 /// Builds an expression which might be an implicit member expression.
237  SourceLocation TemplateKWLoc,
238  LookupResult &R,
239  const TemplateArgumentListInfo *TemplateArgs,
240  const Scope *S) {
241  switch (ClassifyImplicitMemberAccess(*this, R)) {
242  case IMA_Instance:
243  return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, true, S);
244 
245  case IMA_Mixed:
246  case IMA_Mixed_Unrelated:
247  case IMA_Unresolved:
248  return BuildImplicitMemberExpr(SS, TemplateKWLoc, R, TemplateArgs, false,
249  S);
250 
252  Diag(R.getNameLoc(), diag::warn_cxx98_compat_non_static_member_use)
253  << R.getLookupNameInfo().getName();
254  LLVM_FALLTHROUGH;
255  case IMA_Static:
256  case IMA_Abstract:
259  if (TemplateArgs || TemplateKWLoc.isValid())
260  return BuildTemplateIdExpr(SS, TemplateKWLoc, R, false, TemplateArgs);
261  return BuildDeclarationNameExpr(SS, R, false);
262 
264  case IMA_Error_Unrelated:
266  R.getLookupNameInfo());
267  return ExprError();
268  }
269 
270  llvm_unreachable("unexpected instance member access kind");
271 }
272 
273 /// Determine whether input char is from rgba component set.
274 static bool
275 IsRGBA(char c) {
276  switch (c) {
277  case 'r':
278  case 'g':
279  case 'b':
280  case 'a':
281  return true;
282  default:
283  return false;
284  }
285 }
286 
287 // OpenCL v1.1, s6.1.7
288 // The component swizzle length must be in accordance with the acceptable
289 // vector sizes.
290 static bool IsValidOpenCLComponentSwizzleLength(unsigned len)
291 {
292  return (len >= 1 && len <= 4) || len == 8 || len == 16;
293 }
294 
295 /// Check an ext-vector component access expression.
296 ///
297 /// VK should be set in advance to the value kind of the base
298 /// expression.
299 static QualType
301  SourceLocation OpLoc, const IdentifierInfo *CompName,
302  SourceLocation CompLoc) {
303  // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
304  // see FIXME there.
305  //
306  // FIXME: This logic can be greatly simplified by splitting it along
307  // halving/not halving and reworking the component checking.
308  const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
309 
310  // The vector accessor can't exceed the number of elements.
311  const char *compStr = CompName->getNameStart();
312 
313  // This flag determines whether or not the component is one of the four
314  // special names that indicate a subset of exactly half the elements are
315  // to be selected.
316  bool HalvingSwizzle = false;
317 
318  // This flag determines whether or not CompName has an 's' char prefix,
319  // indicating that it is a string of hex values to be used as vector indices.
320  bool HexSwizzle = (*compStr == 's' || *compStr == 'S') && compStr[1];
321 
322  bool HasRepeated = false;
323  bool HasIndex[16] = {};
324 
325  int Idx;
326 
327  // Check that we've found one of the special components, or that the component
328  // names must come from the same set.
329  if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
330  !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
331  HalvingSwizzle = true;
332  } else if (!HexSwizzle &&
333  (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
334  bool HasRGBA = IsRGBA(*compStr);
335  do {
336  // Ensure that xyzw and rgba components don't intermingle.
337  if (HasRGBA != IsRGBA(*compStr))
338  break;
339  if (HasIndex[Idx]) HasRepeated = true;
340  HasIndex[Idx] = true;
341  compStr++;
342  } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
343 
344  // Emit a warning if an rgba selector is used earlier than OpenCL 2.2
345  if (HasRGBA || (*compStr && IsRGBA(*compStr))) {
346  if (S.getLangOpts().OpenCL && S.getLangOpts().OpenCLVersion < 220) {
347  const char *DiagBegin = HasRGBA ? CompName->getNameStart() : compStr;
348  S.Diag(OpLoc, diag::ext_opencl_ext_vector_type_rgba_selector)
349  << StringRef(DiagBegin, 1)
350  << S.getLangOpts().OpenCLVersion << SourceRange(CompLoc);
351  }
352  }
353  } else {
354  if (HexSwizzle) compStr++;
355  while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
356  if (HasIndex[Idx]) HasRepeated = true;
357  HasIndex[Idx] = true;
358  compStr++;
359  }
360  }
361 
362  if (!HalvingSwizzle && *compStr) {
363  // We didn't get to the end of the string. This means the component names
364  // didn't come from the same set *or* we encountered an illegal name.
365  S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
366  << StringRef(compStr, 1) << SourceRange(CompLoc);
367  return QualType();
368  }
369 
370  // Ensure no component accessor exceeds the width of the vector type it
371  // operates on.
372  if (!HalvingSwizzle) {
373  compStr = CompName->getNameStart();
374 
375  if (HexSwizzle)
376  compStr++;
377 
378  while (*compStr) {
379  if (!vecType->isAccessorWithinNumElements(*compStr++, HexSwizzle)) {
380  S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
381  << baseType << SourceRange(CompLoc);
382  return QualType();
383  }
384  }
385  }
386 
387  // OpenCL mode requires swizzle length to be in accordance with accepted
388  // sizes. Clang however supports arbitrary lengths for other languages.
389  if (S.getLangOpts().OpenCL && !HalvingSwizzle) {
390  unsigned SwizzleLength = CompName->getLength();
391 
392  if (HexSwizzle)
393  SwizzleLength--;
394 
395  if (IsValidOpenCLComponentSwizzleLength(SwizzleLength) == false) {
396  S.Diag(OpLoc, diag::err_opencl_ext_vector_component_invalid_length)
397  << SwizzleLength << SourceRange(CompLoc);
398  return QualType();
399  }
400  }
401 
402  // The component accessor looks fine - now we need to compute the actual type.
403  // The vector type is implied by the component accessor. For example,
404  // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
405  // vec4.s0 is a float, vec4.s23 is a vec3, etc.
406  // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
407  unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2
408  : CompName->getLength();
409  if (HexSwizzle)
410  CompSize--;
411 
412  if (CompSize == 1)
413  return vecType->getElementType();
414 
415  if (HasRepeated) VK = VK_RValue;
416 
417  QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
418  // Now look up the TypeDefDecl from the vector type. Without this,
419  // diagostics look bad. We want extended vector types to appear built-in.
420  for (Sema::ExtVectorDeclsType::iterator
422  E = S.ExtVectorDecls.end();
423  I != E; ++I) {
424  if ((*I)->getUnderlyingType() == VT)
425  return S.Context.getTypedefType(*I);
426  }
427 
428  return VT; // should never get here (a typedef type should always be found).
429 }
430 
432  IdentifierInfo *Member,
433  const Selector &Sel,
434  ASTContext &Context) {
435  if (Member)
436  if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(
438  return PD;
439  if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
440  return OMD;
441 
442  for (const auto *I : PDecl->protocols()) {
443  if (Decl *D = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel,
444  Context))
445  return D;
446  }
447  return nullptr;
448 }
449 
451  IdentifierInfo *Member,
452  const Selector &Sel,
453  ASTContext &Context) {
454  // Check protocols on qualified interfaces.
455  Decl *GDecl = nullptr;
456  for (const auto *I : QIdTy->quals()) {
457  if (Member)
458  if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
460  GDecl = PD;
461  break;
462  }
463  // Also must look for a getter or setter name which uses property syntax.
464  if (ObjCMethodDecl *OMD = I->getInstanceMethod(Sel)) {
465  GDecl = OMD;
466  break;
467  }
468  }
469  if (!GDecl) {
470  for (const auto *I : QIdTy->quals()) {
471  // Search in the protocol-qualifier list of current protocol.
472  GDecl = FindGetterSetterNameDeclFromProtocolList(I, Member, Sel, Context);
473  if (GDecl)
474  return GDecl;
475  }
476  }
477  return GDecl;
478 }
479 
482  bool IsArrow, SourceLocation OpLoc,
483  const CXXScopeSpec &SS,
484  SourceLocation TemplateKWLoc,
485  NamedDecl *FirstQualifierInScope,
486  const DeclarationNameInfo &NameInfo,
487  const TemplateArgumentListInfo *TemplateArgs) {
488  // Even in dependent contexts, try to diagnose base expressions with
489  // obviously wrong types, e.g.:
490  //
491  // T* t;
492  // t.f;
493  //
494  // In Obj-C++, however, the above expression is valid, since it could be
495  // accessing the 'f' property if T is an Obj-C interface. The extra check
496  // allows this, while still reporting an error if T is a struct pointer.
497  if (!IsArrow) {
498  const PointerType *PT = BaseType->getAs<PointerType>();
499  if (PT && (!getLangOpts().ObjC1 ||
500  PT->getPointeeType()->isRecordType())) {
501  assert(BaseExpr && "cannot happen with implicit member accesses");
502  Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
503  << BaseType << BaseExpr->getSourceRange() << NameInfo.getSourceRange();
504  return ExprError();
505  }
506  }
507 
508  assert(BaseType->isDependentType() ||
509  NameInfo.getName().isDependentName() ||
510  isDependentScopeSpecifier(SS));
511 
512  // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
513  // must have pointer type, and the accessed type is the pointee.
515  Context, BaseExpr, BaseType, IsArrow, OpLoc,
516  SS.getWithLocInContext(Context), TemplateKWLoc, FirstQualifierInScope,
517  NameInfo, TemplateArgs);
518 }
519 
520 /// We know that the given qualified member reference points only to
521 /// declarations which do not belong to the static type of the base
522 /// expression. Diagnose the problem.
524  Expr *BaseExpr,
525  QualType BaseType,
526  const CXXScopeSpec &SS,
527  NamedDecl *rep,
528  const DeclarationNameInfo &nameInfo) {
529  // If this is an implicit member access, use a different set of
530  // diagnostics.
531  if (!BaseExpr)
532  return diagnoseInstanceReference(SemaRef, SS, rep, nameInfo);
533 
534  SemaRef.Diag(nameInfo.getLoc(), diag::err_qualified_member_of_unrelated)
535  << SS.getRange() << rep << BaseType;
536 }
537 
538 // Check whether the declarations we found through a nested-name
539 // specifier in a member expression are actually members of the base
540 // type. The restriction here is:
541 //
542 // C++ [expr.ref]p2:
543 // ... In these cases, the id-expression shall name a
544 // member of the class or of one of its base classes.
545 //
546 // So it's perfectly legitimate for the nested-name specifier to name
547 // an unrelated class, and for us to find an overload set including
548 // decls from classes which are not superclasses, as long as the decl
549 // we actually pick through overload resolution is from a superclass.
551  QualType BaseType,
552  const CXXScopeSpec &SS,
553  const LookupResult &R) {
554  CXXRecordDecl *BaseRecord =
555  cast_or_null<CXXRecordDecl>(computeDeclContext(BaseType));
556  if (!BaseRecord) {
557  // We can't check this yet because the base type is still
558  // dependent.
559  assert(BaseType->isDependentType());
560  return false;
561  }
562 
563  for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
564  // If this is an implicit member reference and we find a
565  // non-instance member, it's not an error.
566  if (!BaseExpr && !(*I)->isCXXInstanceMember())
567  return false;
568 
569  // Note that we use the DC of the decl, not the underlying decl.
570  DeclContext *DC = (*I)->getDeclContext();
571  while (DC->isTransparentContext())
572  DC = DC->getParent();
573 
574  if (!DC->isRecord())
575  continue;
576 
577  CXXRecordDecl *MemberRecord = cast<CXXRecordDecl>(DC)->getCanonicalDecl();
578  if (BaseRecord->getCanonicalDecl() == MemberRecord ||
579  !BaseRecord->isProvablyNotDerivedFrom(MemberRecord))
580  return false;
581  }
582 
583  DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS,
585  R.getLookupNameInfo());
586  return true;
587 }
588 
589 namespace {
590 
591 // Callback to only accept typo corrections that are either a ValueDecl or a
592 // FunctionTemplateDecl and are declared in the current record or, for a C++
593 // classes, one of its base classes.
594 class RecordMemberExprValidatorCCC : public CorrectionCandidateCallback {
595 public:
596  explicit RecordMemberExprValidatorCCC(const RecordType *RTy)
597  : Record(RTy->getDecl()) {
598  // Don't add bare keywords to the consumer since they will always fail
599  // validation by virtue of not being associated with any decls.
600  WantTypeSpecifiers = false;
601  WantExpressionKeywords = false;
602  WantCXXNamedCasts = false;
603  WantFunctionLikeCasts = false;
604  WantRemainingKeywords = false;
605  }
606 
607  bool ValidateCandidate(const TypoCorrection &candidate) override {
608  NamedDecl *ND = candidate.getCorrectionDecl();
609  // Don't accept candidates that cannot be member functions, constants,
610  // variables, or templates.
611  if (!ND || !(isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)))
612  return false;
613 
614  // Accept candidates that occur in the current record.
615  if (Record->containsDecl(ND))
616  return true;
617 
618  if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Record)) {
619  // Accept candidates that occur in any of the current class' base classes.
620  for (const auto &BS : RD->bases()) {
621  if (const RecordType *BSTy =
622  dyn_cast_or_null<RecordType>(BS.getType().getTypePtrOrNull())) {
623  if (BSTy->getDecl()->containsDecl(ND))
624  return true;
625  }
626  }
627  }
628 
629  return false;
630  }
631 
632 private:
633  const RecordDecl *const Record;
634 };
635 
636 }
637 
638 static bool LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
639  Expr *BaseExpr,
640  const RecordType *RTy,
641  SourceLocation OpLoc, bool IsArrow,
642  CXXScopeSpec &SS, bool HasTemplateArgs,
643  SourceLocation TemplateKWLoc,
644  TypoExpr *&TE) {
645  SourceRange BaseRange = BaseExpr ? BaseExpr->getSourceRange() : SourceRange();
646  RecordDecl *RDecl = RTy->getDecl();
647  if (!SemaRef.isThisOutsideMemberFunctionBody(QualType(RTy, 0)) &&
648  SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
649  diag::err_typecheck_incomplete_tag,
650  BaseRange))
651  return true;
652 
653  if (HasTemplateArgs || TemplateKWLoc.isValid()) {
654  // LookupTemplateName doesn't expect these both to exist simultaneously.
655  QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
656 
657  bool MOUS;
658  return SemaRef.LookupTemplateName(R, nullptr, SS, ObjectType, false, MOUS,
659  TemplateKWLoc);
660  }
661 
662  DeclContext *DC = RDecl;
663  if (SS.isSet()) {
664  // If the member name was a qualified-id, look into the
665  // nested-name-specifier.
666  DC = SemaRef.computeDeclContext(SS, false);
667 
668  if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
669  SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
670  << SS.getRange() << DC;
671  return true;
672  }
673 
674  assert(DC && "Cannot handle non-computable dependent contexts in lookup");
675 
676  if (!isa<TypeDecl>(DC)) {
677  SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
678  << DC << SS.getRange();
679  return true;
680  }
681  }
682 
683  // The record definition is complete, now look up the member.
684  SemaRef.LookupQualifiedName(R, DC, SS);
685 
686  if (!R.empty())
687  return false;
688 
689  DeclarationName Typo = R.getLookupName();
690  SourceLocation TypoLoc = R.getNameLoc();
691 
692  struct QueryState {
693  Sema &SemaRef;
694  DeclarationNameInfo NameInfo;
695  Sema::LookupNameKind LookupKind;
697  };
698  QueryState Q = {R.getSema(), R.getLookupNameInfo(), R.getLookupKind(),
699  R.redeclarationKind()};
700  TE = SemaRef.CorrectTypoDelayed(
701  R.getLookupNameInfo(), R.getLookupKind(), nullptr, &SS,
702  llvm::make_unique<RecordMemberExprValidatorCCC>(RTy),
703  [=, &SemaRef](const TypoCorrection &TC) {
704  if (TC) {
705  assert(!TC.isKeyword() &&
706  "Got a keyword as a correction for a member!");
707  bool DroppedSpecifier =
708  TC.WillReplaceSpecifier() &&
709  Typo.getAsString() == TC.getAsString(SemaRef.getLangOpts());
710  SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
711  << Typo << DC << DroppedSpecifier
712  << SS.getRange());
713  } else {
714  SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << DC << BaseRange;
715  }
716  },
717  [=](Sema &SemaRef, TypoExpr *TE, TypoCorrection TC) mutable {
718  LookupResult R(Q.SemaRef, Q.NameInfo, Q.LookupKind, Q.Redecl);
719  R.clear(); // Ensure there's no decls lingering in the shared state.
722  for (NamedDecl *ND : TC)
723  R.addDecl(ND);
724  R.resolveKind();
725  return SemaRef.BuildMemberReferenceExpr(
726  BaseExpr, BaseExpr->getType(), OpLoc, IsArrow, SS, SourceLocation(),
727  nullptr, R, nullptr, nullptr);
728  },
730 
731  return false;
732 }
733 
735  ExprResult &BaseExpr, bool &IsArrow,
736  SourceLocation OpLoc, CXXScopeSpec &SS,
737  Decl *ObjCImpDecl, bool HasTemplateArgs,
738  SourceLocation TemplateKWLoc);
739 
742  SourceLocation OpLoc, bool IsArrow,
743  CXXScopeSpec &SS,
744  SourceLocation TemplateKWLoc,
745  NamedDecl *FirstQualifierInScope,
746  const DeclarationNameInfo &NameInfo,
747  const TemplateArgumentListInfo *TemplateArgs,
748  const Scope *S,
749  ActOnMemberAccessExtraArgs *ExtraArgs) {
750  if (BaseType->isDependentType() ||
751  (SS.isSet() && isDependentScopeSpecifier(SS)))
752  return ActOnDependentMemberExpr(Base, BaseType,
753  IsArrow, OpLoc,
754  SS, TemplateKWLoc, FirstQualifierInScope,
755  NameInfo, TemplateArgs);
756 
757  LookupResult R(*this, NameInfo, LookupMemberName);
758 
759  // Implicit member accesses.
760  if (!Base) {
761  TypoExpr *TE = nullptr;
762  QualType RecordTy = BaseType;
763  if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
765  *this, R, nullptr, RecordTy->getAs<RecordType>(), OpLoc, IsArrow,
766  SS, TemplateArgs != nullptr, TemplateKWLoc, TE))
767  return ExprError();
768  if (TE)
769  return TE;
770 
771  // Explicit member accesses.
772  } else {
773  ExprResult BaseResult = Base;
774  ExprResult Result =
775  LookupMemberExpr(*this, R, BaseResult, IsArrow, OpLoc, SS,
776  ExtraArgs ? ExtraArgs->ObjCImpDecl : nullptr,
777  TemplateArgs != nullptr, TemplateKWLoc);
778 
779  if (BaseResult.isInvalid())
780  return ExprError();
781  Base = BaseResult.get();
782 
783  if (Result.isInvalid())
784  return ExprError();
785 
786  if (Result.get())
787  return Result;
788 
789  // LookupMemberExpr can modify Base, and thus change BaseType
790  BaseType = Base->getType();
791  }
792 
793  return BuildMemberReferenceExpr(Base, BaseType,
794  OpLoc, IsArrow, SS, TemplateKWLoc,
795  FirstQualifierInScope, R, TemplateArgs, S,
796  false, ExtraArgs);
797 }
798 
801  SourceLocation loc,
802  IndirectFieldDecl *indirectField,
803  DeclAccessPair foundDecl,
804  Expr *baseObjectExpr,
805  SourceLocation opLoc) {
806  // First, build the expression that refers to the base object.
807 
808  // Case 1: the base of the indirect field is not a field.
809  VarDecl *baseVariable = indirectField->getVarDecl();
810  CXXScopeSpec EmptySS;
811  if (baseVariable) {
812  assert(baseVariable->getType()->isRecordType());
813 
814  // In principle we could have a member access expression that
815  // accesses an anonymous struct/union that's a static member of
816  // the base object's class. However, under the current standard,
817  // static data members cannot be anonymous structs or unions.
818  // Supporting this is as easy as building a MemberExpr here.
819  assert(!baseObjectExpr && "anonymous struct/union is static data member?");
820 
821  DeclarationNameInfo baseNameInfo(DeclarationName(), loc);
822 
823  ExprResult result
824  = BuildDeclarationNameExpr(EmptySS, baseNameInfo, baseVariable);
825  if (result.isInvalid()) return ExprError();
826 
827  baseObjectExpr = result.get();
828  }
829 
830  assert((baseVariable || baseObjectExpr) &&
831  "referencing anonymous struct/union without a base variable or "
832  "expression");
833 
834  // Build the implicit member references to the field of the
835  // anonymous struct/union.
836  Expr *result = baseObjectExpr;
838  FI = indirectField->chain_begin(), FEnd = indirectField->chain_end();
839 
840  // Case 2: the base of the indirect field is a field and the user
841  // wrote a member expression.
842  if (!baseVariable) {
843  FieldDecl *field = cast<FieldDecl>(*FI);
844 
845  bool baseObjectIsPointer = baseObjectExpr->getType()->isPointerType();
846 
847  // Make a nameInfo that properly uses the anonymous name.
848  DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
849 
850  // Build the first member access in the chain with full information.
851  result =
852  BuildFieldReferenceExpr(result, baseObjectIsPointer, SourceLocation(),
853  SS, field, foundDecl, memberNameInfo)
854  .get();
855  if (!result)
856  return ExprError();
857  }
858 
859  // In all cases, we should now skip the first declaration in the chain.
860  ++FI;
861 
862  while (FI != FEnd) {
863  FieldDecl *field = cast<FieldDecl>(*FI++);
864 
865  // FIXME: these are somewhat meaningless
866  DeclarationNameInfo memberNameInfo(field->getDeclName(), loc);
867  DeclAccessPair fakeFoundDecl =
868  DeclAccessPair::make(field, field->getAccess());
869 
870  result =
871  BuildFieldReferenceExpr(result, /*isarrow*/ false, SourceLocation(),
872  (FI == FEnd ? SS : EmptySS), field,
873  fakeFoundDecl, memberNameInfo)
874  .get();
875  }
876 
877  return result;
878 }
879 
880 static ExprResult
881 BuildMSPropertyRefExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
882  const CXXScopeSpec &SS,
883  MSPropertyDecl *PD,
884  const DeclarationNameInfo &NameInfo) {
885  // Property names are always simple identifiers and therefore never
886  // require any interesting additional storage.
887  return new (S.Context) MSPropertyRefExpr(BaseExpr, PD, IsArrow,
890  NameInfo.getLoc());
891 }
892 
893 /// Build a MemberExpr AST node.
895  Sema &SemaRef, ASTContext &C, Expr *Base, bool isArrow,
896  SourceLocation OpLoc, const CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
897  ValueDecl *Member, DeclAccessPair FoundDecl,
898  const DeclarationNameInfo &MemberNameInfo, QualType Ty, ExprValueKind VK,
899  ExprObjectKind OK, const TemplateArgumentListInfo *TemplateArgs = nullptr) {
900  assert((!isArrow || Base->isRValue()) && "-> base must be a pointer rvalue");
902  C, Base, isArrow, OpLoc, SS.getWithLocInContext(C), TemplateKWLoc, Member,
903  FoundDecl, MemberNameInfo, TemplateArgs, Ty, VK, OK);
904  SemaRef.MarkMemberReferenced(E);
905  return E;
906 }
907 
908 /// Determine if the given scope is within a function-try-block handler.
909 static bool IsInFnTryBlockHandler(const Scope *S) {
910  // Walk the scope stack until finding a FnTryCatchScope, or leave the
911  // function scope. If a FnTryCatchScope is found, check whether the TryScope
912  // flag is set. If it is not, it's a function-try-block handler.
913  for (; S != S->getFnParent(); S = S->getParent()) {
914  if (S->getFlags() & Scope::FnTryCatchScope)
915  return (S->getFlags() & Scope::TryScope) != Scope::TryScope;
916  }
917  return false;
918 }
919 
920 static VarDecl *
922  const TemplateArgumentListInfo *TemplateArgs,
923  const DeclarationNameInfo &MemberNameInfo,
924  SourceLocation TemplateKWLoc) {
925  if (!TemplateArgs) {
927  MemberNameInfo.getBeginLoc());
928  return nullptr;
929  }
930 
931  DeclResult VDecl = S.CheckVarTemplateId(
932  VarTempl, TemplateKWLoc, MemberNameInfo.getLoc(), *TemplateArgs);
933  if (VDecl.isInvalid())
934  return nullptr;
935  VarDecl *Var = cast<VarDecl>(VDecl.get());
936  if (!Var->getTemplateSpecializationKind())
938  MemberNameInfo.getLoc());
939  return Var;
940 }
941 
944  SourceLocation OpLoc, bool IsArrow,
945  const CXXScopeSpec &SS,
946  SourceLocation TemplateKWLoc,
947  NamedDecl *FirstQualifierInScope,
948  LookupResult &R,
949  const TemplateArgumentListInfo *TemplateArgs,
950  const Scope *S,
951  bool SuppressQualifierCheck,
952  ActOnMemberAccessExtraArgs *ExtraArgs) {
953  QualType BaseType = BaseExprType;
954  if (IsArrow) {
955  assert(BaseType->isPointerType());
956  BaseType = BaseType->castAs<PointerType>()->getPointeeType();
957  }
958  R.setBaseObjectType(BaseType);
959 
960  // C++1z [expr.ref]p2:
961  // For the first option (dot) the first expression shall be a glvalue [...]
962  if (!IsArrow && BaseExpr && BaseExpr->isRValue()) {
963  ExprResult Converted = TemporaryMaterializationConversion(BaseExpr);
964  if (Converted.isInvalid())
965  return ExprError();
966  BaseExpr = Converted.get();
967  }
968 
969 
970  const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
971  DeclarationName MemberName = MemberNameInfo.getName();
972  SourceLocation MemberLoc = MemberNameInfo.getLoc();
973 
974  if (R.isAmbiguous())
975  return ExprError();
976 
977  // [except.handle]p10: Referring to any non-static member or base class of an
978  // object in the handler for a function-try-block of a constructor or
979  // destructor for that object results in undefined behavior.
980  const auto *FD = getCurFunctionDecl();
981  if (S && BaseExpr && FD &&
982  (isa<CXXDestructorDecl>(FD) || isa<CXXConstructorDecl>(FD)) &&
983  isa<CXXThisExpr>(BaseExpr->IgnoreImpCasts()) &&
985  Diag(MemberLoc, diag::warn_cdtor_function_try_handler_mem_expr)
986  << isa<CXXDestructorDecl>(FD);
987 
988  if (R.empty()) {
989  // Rederive where we looked up.
990  DeclContext *DC = (SS.isSet()
991  ? computeDeclContext(SS, false)
992  : BaseType->getAs<RecordType>()->getDecl());
993 
994  if (ExtraArgs) {
995  ExprResult RetryExpr;
996  if (!IsArrow && BaseExpr) {
997  SFINAETrap Trap(*this, true);
998  ParsedType ObjectType;
999  bool MayBePseudoDestructor = false;
1000  RetryExpr = ActOnStartCXXMemberReference(getCurScope(), BaseExpr,
1001  OpLoc, tok::arrow, ObjectType,
1002  MayBePseudoDestructor);
1003  if (RetryExpr.isUsable() && !Trap.hasErrorOccurred()) {
1004  CXXScopeSpec TempSS(SS);
1005  RetryExpr = ActOnMemberAccessExpr(
1006  ExtraArgs->S, RetryExpr.get(), OpLoc, tok::arrow, TempSS,
1007  TemplateKWLoc, ExtraArgs->Id, ExtraArgs->ObjCImpDecl);
1008  }
1009  if (Trap.hasErrorOccurred())
1010  RetryExpr = ExprError();
1011  }
1012  if (RetryExpr.isUsable()) {
1013  Diag(OpLoc, diag::err_no_member_overloaded_arrow)
1014  << MemberName << DC << FixItHint::CreateReplacement(OpLoc, "->");
1015  return RetryExpr;
1016  }
1017  }
1018 
1019  Diag(R.getNameLoc(), diag::err_no_member)
1020  << MemberName << DC
1021  << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
1022  return ExprError();
1023  }
1024 
1025  // Diagnose lookups that find only declarations from a non-base
1026  // type. This is possible for either qualified lookups (which may
1027  // have been qualified with an unrelated type) or implicit member
1028  // expressions (which were found with unqualified lookup and thus
1029  // may have come from an enclosing scope). Note that it's okay for
1030  // lookup to find declarations from a non-base type as long as those
1031  // aren't the ones picked by overload resolution.
1032  if ((SS.isSet() || !BaseExpr ||
1033  (isa<CXXThisExpr>(BaseExpr) &&
1034  cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
1035  !SuppressQualifierCheck &&
1036  CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
1037  return ExprError();
1038 
1039  // Construct an unresolved result if we in fact got an unresolved
1040  // result.
1041  if (R.isOverloadedResult() || R.isUnresolvableResult()) {
1042  // Suppress any lookup-related diagnostics; we'll do these when we
1043  // pick a member.
1044  R.suppressDiagnostics();
1045 
1046  UnresolvedMemberExpr *MemExpr
1048  BaseExpr, BaseExprType,
1049  IsArrow, OpLoc,
1050  SS.getWithLocInContext(Context),
1051  TemplateKWLoc, MemberNameInfo,
1052  TemplateArgs, R.begin(), R.end());
1053 
1054  return MemExpr;
1055  }
1056 
1057  assert(R.isSingleResult());
1058  DeclAccessPair FoundDecl = R.begin().getPair();
1059  NamedDecl *MemberDecl = R.getFoundDecl();
1060 
1061  // FIXME: diagnose the presence of template arguments now.
1062 
1063  // If the decl being referenced had an error, return an error for this
1064  // sub-expr without emitting another error, in order to avoid cascading
1065  // error cases.
1066  if (MemberDecl->isInvalidDecl())
1067  return ExprError();
1068 
1069  // Handle the implicit-member-access case.
1070  if (!BaseExpr) {
1071  // If this is not an instance member, convert to a non-member access.
1072  if (!MemberDecl->isCXXInstanceMember()) {
1073  // If this is a variable template, get the instantiated variable
1074  // declaration corresponding to the supplied template arguments
1075  // (while emitting diagnostics as necessary) that will be referenced
1076  // by this expression.
1077  assert((!TemplateArgs || isa<VarTemplateDecl>(MemberDecl)) &&
1078  "How did we get template arguments here sans a variable template");
1079  if (isa<VarTemplateDecl>(MemberDecl)) {
1080  MemberDecl = getVarTemplateSpecialization(
1081  *this, cast<VarTemplateDecl>(MemberDecl), TemplateArgs,
1082  R.getLookupNameInfo(), TemplateKWLoc);
1083  if (!MemberDecl)
1084  return ExprError();
1085  }
1086  return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl,
1087  FoundDecl, TemplateArgs);
1088  }
1089  SourceLocation Loc = R.getNameLoc();
1090  if (SS.getRange().isValid())
1091  Loc = SS.getRange().getBegin();
1092  CheckCXXThisCapture(Loc);
1093  BaseExpr = new (Context) CXXThisExpr(Loc, BaseExprType,/*isImplicit=*/true);
1094  }
1095 
1096  // Check the use of this member.
1097  if (DiagnoseUseOfDecl(MemberDecl, MemberLoc))
1098  return ExprError();
1099 
1100  if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
1101  return BuildFieldReferenceExpr(BaseExpr, IsArrow, OpLoc, SS, FD, FoundDecl,
1102  MemberNameInfo);
1103 
1104  if (MSPropertyDecl *PD = dyn_cast<MSPropertyDecl>(MemberDecl))
1105  return BuildMSPropertyRefExpr(*this, BaseExpr, IsArrow, SS, PD,
1106  MemberNameInfo);
1107 
1108  if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
1109  // We may have found a field within an anonymous union or struct
1110  // (C++ [class.union]).
1111  return BuildAnonymousStructUnionMemberReference(SS, MemberLoc, FD,
1112  FoundDecl, BaseExpr,
1113  OpLoc);
1114 
1115  if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
1116  return BuildMemberExpr(*this, Context, BaseExpr, IsArrow, OpLoc, SS,
1117  TemplateKWLoc, Var, FoundDecl, MemberNameInfo,
1118  Var->getType().getNonReferenceType(), VK_LValue,
1119  OK_Ordinary);
1120  }
1121 
1122  if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
1123  ExprValueKind valueKind;
1124  QualType type;
1125  if (MemberFn->isInstance()) {
1126  valueKind = VK_RValue;
1127  type = Context.BoundMemberTy;
1128  } else {
1129  valueKind = VK_LValue;
1130  type = MemberFn->getType();
1131  }
1132 
1133  return BuildMemberExpr(*this, Context, BaseExpr, IsArrow, OpLoc, SS,
1134  TemplateKWLoc, MemberFn, FoundDecl, MemberNameInfo,
1135  type, valueKind, OK_Ordinary);
1136  }
1137  assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?");
1138 
1139  if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
1140  return BuildMemberExpr(*this, Context, BaseExpr, IsArrow, OpLoc, SS,
1141  TemplateKWLoc, Enum, FoundDecl, MemberNameInfo,
1142  Enum->getType(), VK_RValue, OK_Ordinary);
1143  }
1144  if (VarTemplateDecl *VarTempl = dyn_cast<VarTemplateDecl>(MemberDecl)) {
1146  *this, VarTempl, TemplateArgs, MemberNameInfo, TemplateKWLoc))
1147  return BuildMemberExpr(*this, Context, BaseExpr, IsArrow, OpLoc, SS,
1148  TemplateKWLoc, Var, FoundDecl, MemberNameInfo,
1149  Var->getType().getNonReferenceType(), VK_LValue,
1150  OK_Ordinary);
1151  return ExprError();
1152  }
1153 
1154  // We found something that we didn't expect. Complain.
1155  if (isa<TypeDecl>(MemberDecl))
1156  Diag(MemberLoc, diag::err_typecheck_member_reference_type)
1157  << MemberName << BaseType << int(IsArrow);
1158  else
1159  Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
1160  << MemberName << BaseType << int(IsArrow);
1161 
1162  Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
1163  << MemberName;
1164  R.suppressDiagnostics();
1165  return ExprError();
1166 }
1167 
1168 /// Given that normal member access failed on the given expression,
1169 /// and given that the expression's type involves builtin-id or
1170 /// builtin-Class, decide whether substituting in the redefinition
1171 /// types would be profitable. The redefinition type is whatever
1172 /// this translation unit tried to typedef to id/Class; we store
1173 /// it to the side and then re-use it in places like this.
1175  const ObjCObjectPointerType *opty
1176  = base.get()->getType()->getAs<ObjCObjectPointerType>();
1177  if (!opty) return false;
1178 
1179  const ObjCObjectType *ty = opty->getObjectType();
1180 
1181  QualType redef;
1182  if (ty->isObjCId()) {
1183  redef = S.Context.getObjCIdRedefinitionType();
1184  } else if (ty->isObjCClass()) {
1186  } else {
1187  return false;
1188  }
1189 
1190  // Do the substitution as long as the redefinition type isn't just a
1191  // possibly-qualified pointer to builtin-id or builtin-Class again.
1192  opty = redef->getAs<ObjCObjectPointerType>();
1193  if (opty && !opty->getObjectType()->getInterface())
1194  return false;
1195 
1196  base = S.ImpCastExprToType(base.get(), redef, CK_BitCast);
1197  return true;
1198 }
1199 
1200 static bool isRecordType(QualType T) {
1201  return T->isRecordType();
1202 }
1204  if (const PointerType *PT = T->getAs<PointerType>())
1205  return PT->getPointeeType()->isRecordType();
1206  return false;
1207 }
1208 
1209 /// Perform conversions on the LHS of a member access expression.
1210 ExprResult
1212  if (IsArrow && !Base->getType()->isFunctionType())
1213  return DefaultFunctionArrayLvalueConversion(Base);
1214 
1215  return CheckPlaceholderExpr(Base);
1216 }
1217 
1218 /// Look up the given member of the given non-type-dependent
1219 /// expression. This can return in one of two ways:
1220 /// * If it returns a sentinel null-but-valid result, the caller will
1221 /// assume that lookup was performed and the results written into
1222 /// the provided structure. It will take over from there.
1223 /// * Otherwise, the returned expression will be produced in place of
1224 /// an ordinary member expression.
1225 ///
1226 /// The ObjCImpDecl bit is a gross hack that will need to be properly
1227 /// fixed for ObjC++.
1229  ExprResult &BaseExpr, bool &IsArrow,
1230  SourceLocation OpLoc, CXXScopeSpec &SS,
1231  Decl *ObjCImpDecl, bool HasTemplateArgs,
1232  SourceLocation TemplateKWLoc) {
1233  assert(BaseExpr.get() && "no base expression");
1234 
1235  // Perform default conversions.
1236  BaseExpr = S.PerformMemberExprBaseConversion(BaseExpr.get(), IsArrow);
1237  if (BaseExpr.isInvalid())
1238  return ExprError();
1239 
1240  QualType BaseType = BaseExpr.get()->getType();
1241  assert(!BaseType->isDependentType());
1242 
1243  DeclarationName MemberName = R.getLookupName();
1244  SourceLocation MemberLoc = R.getNameLoc();
1245 
1246  // For later type-checking purposes, turn arrow accesses into dot
1247  // accesses. The only access type we support that doesn't follow
1248  // the C equivalence "a->b === (*a).b" is ObjC property accesses,
1249  // and those never use arrows, so this is unaffected.
1250  if (IsArrow) {
1251  if (const PointerType *Ptr = BaseType->getAs<PointerType>())
1252  BaseType = Ptr->getPointeeType();
1253  else if (const ObjCObjectPointerType *Ptr
1254  = BaseType->getAs<ObjCObjectPointerType>())
1255  BaseType = Ptr->getPointeeType();
1256  else if (BaseType->isRecordType()) {
1257  // Recover from arrow accesses to records, e.g.:
1258  // struct MyRecord foo;
1259  // foo->bar
1260  // This is actually well-formed in C++ if MyRecord has an
1261  // overloaded operator->, but that should have been dealt with
1262  // by now--or a diagnostic message already issued if a problem
1263  // was encountered while looking for the overloaded operator->.
1264  if (!S.getLangOpts().CPlusPlus) {
1265  S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1266  << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1267  << FixItHint::CreateReplacement(OpLoc, ".");
1268  }
1269  IsArrow = false;
1270  } else if (BaseType->isFunctionType()) {
1271  goto fail;
1272  } else {
1273  S.Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
1274  << BaseType << BaseExpr.get()->getSourceRange();
1275  return ExprError();
1276  }
1277  }
1278 
1279  // Handle field access to simple records.
1280  if (const RecordType *RTy = BaseType->getAs<RecordType>()) {
1281  TypoExpr *TE = nullptr;
1282  if (LookupMemberExprInRecord(S, R, BaseExpr.get(), RTy, OpLoc, IsArrow, SS,
1283  HasTemplateArgs, TemplateKWLoc, TE))
1284  return ExprError();
1285 
1286  // Returning valid-but-null is how we indicate to the caller that
1287  // the lookup result was filled in. If typo correction was attempted and
1288  // failed, the lookup result will have been cleared--that combined with the
1289  // valid-but-null ExprResult will trigger the appropriate diagnostics.
1290  return ExprResult(TE);
1291  }
1292 
1293  // Handle ivar access to Objective-C objects.
1294  if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>()) {
1295  if (!SS.isEmpty() && !SS.isInvalid()) {
1296  S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1297  << 1 << SS.getScopeRep()
1299  SS.clear();
1300  }
1301 
1302  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1303 
1304  // There are three cases for the base type:
1305  // - builtin id (qualified or unqualified)
1306  // - builtin Class (qualified or unqualified)
1307  // - an interface
1308  ObjCInterfaceDecl *IDecl = OTy->getInterface();
1309  if (!IDecl) {
1310  if (S.getLangOpts().ObjCAutoRefCount &&
1311  (OTy->isObjCId() || OTy->isObjCClass()))
1312  goto fail;
1313  // There's an implicit 'isa' ivar on all objects.
1314  // But we only actually find it this way on objects of type 'id',
1315  // apparently.
1316  if (OTy->isObjCId() && Member->isStr("isa"))
1317  return new (S.Context) ObjCIsaExpr(BaseExpr.get(), IsArrow, MemberLoc,
1318  OpLoc, S.Context.getObjCClassType());
1319  if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1320  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1321  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1322  goto fail;
1323  }
1324 
1325  if (S.RequireCompleteType(OpLoc, BaseType,
1326  diag::err_typecheck_incomplete_tag,
1327  BaseExpr.get()))
1328  return ExprError();
1329 
1330  ObjCInterfaceDecl *ClassDeclared = nullptr;
1331  ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
1332 
1333  if (!IV) {
1334  // Attempt to correct for typos in ivar names.
1335  auto Validator = llvm::make_unique<DeclFilterCCC<ObjCIvarDecl>>();
1336  Validator->IsObjCIvarLookup = IsArrow;
1337  if (TypoCorrection Corrected = S.CorrectTypo(
1338  R.getLookupNameInfo(), Sema::LookupMemberName, nullptr, nullptr,
1339  std::move(Validator), Sema::CTK_ErrorRecovery, IDecl)) {
1340  IV = Corrected.getCorrectionDeclAs<ObjCIvarDecl>();
1341  S.diagnoseTypo(
1342  Corrected,
1343  S.PDiag(diag::err_typecheck_member_reference_ivar_suggest)
1344  << IDecl->getDeclName() << MemberName);
1345 
1346  // Figure out the class that declares the ivar.
1347  assert(!ClassDeclared);
1348 
1349  Decl *D = cast<Decl>(IV->getDeclContext());
1350  if (auto *Category = dyn_cast<ObjCCategoryDecl>(D))
1351  D = Category->getClassInterface();
1352 
1353  if (auto *Implementation = dyn_cast<ObjCImplementationDecl>(D))
1354  ClassDeclared = Implementation->getClassInterface();
1355  else if (auto *Interface = dyn_cast<ObjCInterfaceDecl>(D))
1356  ClassDeclared = Interface;
1357 
1358  assert(ClassDeclared && "cannot query interface");
1359  } else {
1360  if (IsArrow &&
1361  IDecl->FindPropertyDeclaration(
1363  S.Diag(MemberLoc, diag::err_property_found_suggest)
1364  << Member << BaseExpr.get()->getType()
1365  << FixItHint::CreateReplacement(OpLoc, ".");
1366  return ExprError();
1367  }
1368 
1369  S.Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
1370  << IDecl->getDeclName() << MemberName
1371  << BaseExpr.get()->getSourceRange();
1372  return ExprError();
1373  }
1374  }
1375 
1376  assert(ClassDeclared);
1377 
1378  // If the decl being referenced had an error, return an error for this
1379  // sub-expr without emitting another error, in order to avoid cascading
1380  // error cases.
1381  if (IV->isInvalidDecl())
1382  return ExprError();
1383 
1384  // Check whether we can reference this field.
1385  if (S.DiagnoseUseOfDecl(IV, MemberLoc))
1386  return ExprError();
1387  if (IV->getAccessControl() != ObjCIvarDecl::Public &&
1389  ObjCInterfaceDecl *ClassOfMethodDecl = nullptr;
1390  if (ObjCMethodDecl *MD = S.getCurMethodDecl())
1391  ClassOfMethodDecl = MD->getClassInterface();
1392  else if (ObjCImpDecl && S.getCurFunctionDecl()) {
1393  // Case of a c-function declared inside an objc implementation.
1394  // FIXME: For a c-style function nested inside an objc implementation
1395  // class, there is no implementation context available, so we pass
1396  // down the context as argument to this routine. Ideally, this context
1397  // need be passed down in the AST node and somehow calculated from the
1398  // AST for a function decl.
1399  if (ObjCImplementationDecl *IMPD =
1400  dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
1401  ClassOfMethodDecl = IMPD->getClassInterface();
1402  else if (ObjCCategoryImplDecl* CatImplClass =
1403  dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
1404  ClassOfMethodDecl = CatImplClass->getClassInterface();
1405  }
1406  if (!S.getLangOpts().DebuggerSupport) {
1407  if (IV->getAccessControl() == ObjCIvarDecl::Private) {
1408  if (!declaresSameEntity(ClassDeclared, IDecl) ||
1409  !declaresSameEntity(ClassOfMethodDecl, ClassDeclared))
1410  S.Diag(MemberLoc, diag::err_private_ivar_access)
1411  << IV->getDeclName();
1412  } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
1413  // @protected
1414  S.Diag(MemberLoc, diag::err_protected_ivar_access)
1415  << IV->getDeclName();
1416  }
1417  }
1418  bool warn = true;
1419  if (S.getLangOpts().ObjCWeak) {
1420  Expr *BaseExp = BaseExpr.get()->IgnoreParenImpCasts();
1421  if (UnaryOperator *UO = dyn_cast<UnaryOperator>(BaseExp))
1422  if (UO->getOpcode() == UO_Deref)
1423  BaseExp = UO->getSubExpr()->IgnoreParenCasts();
1424 
1425  if (DeclRefExpr *DE = dyn_cast<DeclRefExpr>(BaseExp))
1426  if (DE->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1427  S.Diag(DE->getLocation(), diag::err_arc_weak_ivar_access);
1428  warn = false;
1429  }
1430  }
1431  if (warn) {
1432  if (ObjCMethodDecl *MD = S.getCurMethodDecl()) {
1433  ObjCMethodFamily MF = MD->getMethodFamily();
1434  warn = (MF != OMF_init && MF != OMF_dealloc &&
1435  MF != OMF_finalize &&
1436  !S.IvarBacksCurrentMethodAccessor(IDecl, MD, IV));
1437  }
1438  if (warn)
1439  S.Diag(MemberLoc, diag::warn_direct_ivar_access) << IV->getDeclName();
1440  }
1441 
1442  ObjCIvarRefExpr *Result = new (S.Context) ObjCIvarRefExpr(
1443  IV, IV->getUsageType(BaseType), MemberLoc, OpLoc, BaseExpr.get(),
1444  IsArrow);
1445 
1446  if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
1447  if (!S.isUnevaluatedContext() &&
1448  !S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, MemberLoc))
1449  S.getCurFunction()->recordUseOfWeak(Result);
1450  }
1451 
1452  return Result;
1453  }
1454 
1455  // Objective-C property access.
1456  const ObjCObjectPointerType *OPT;
1457  if (!IsArrow && (OPT = BaseType->getAs<ObjCObjectPointerType>())) {
1458  if (!SS.isEmpty() && !SS.isInvalid()) {
1459  S.Diag(SS.getRange().getBegin(), diag::err_qualified_objc_access)
1460  << 0 << SS.getScopeRep() << FixItHint::CreateRemoval(SS.getRange());
1461  SS.clear();
1462  }
1463 
1464  // This actually uses the base as an r-value.
1465  BaseExpr = S.DefaultLvalueConversion(BaseExpr.get());
1466  if (BaseExpr.isInvalid())
1467  return ExprError();
1468 
1469  assert(S.Context.hasSameUnqualifiedType(BaseType,
1470  BaseExpr.get()->getType()));
1471 
1472  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1473 
1474  const ObjCObjectType *OT = OPT->getObjectType();
1475 
1476  // id, with and without qualifiers.
1477  if (OT->isObjCId()) {
1478  // Check protocols on qualified interfaces.
1479  Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1480  if (Decl *PMDecl =
1481  FindGetterSetterNameDecl(OPT, Member, Sel, S.Context)) {
1482  if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
1483  // Check the use of this declaration
1484  if (S.DiagnoseUseOfDecl(PD, MemberLoc))
1485  return ExprError();
1486 
1487  return new (S.Context)
1489  OK_ObjCProperty, MemberLoc, BaseExpr.get());
1490  }
1491 
1492  if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
1493  Selector SetterSel =
1495  S.PP.getSelectorTable(),
1496  Member);
1497  ObjCMethodDecl *SMD = nullptr;
1498  if (Decl *SDecl = FindGetterSetterNameDecl(OPT,
1499  /*Property id*/ nullptr,
1500  SetterSel, S.Context))
1501  SMD = dyn_cast<ObjCMethodDecl>(SDecl);
1502 
1503  return new (S.Context)
1505  OK_ObjCProperty, MemberLoc, BaseExpr.get());
1506  }
1507  }
1508  // Use of id.member can only be for a property reference. Do not
1509  // use the 'id' redefinition in this case.
1510  if (IsArrow && ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1511  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1512  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1513 
1514  return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1515  << MemberName << BaseType);
1516  }
1517 
1518  // 'Class', unqualified only.
1519  if (OT->isObjCClass()) {
1520  // Only works in a method declaration (??!).
1521  ObjCMethodDecl *MD = S.getCurMethodDecl();
1522  if (!MD) {
1523  if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1524  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1525  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1526 
1527  goto fail;
1528  }
1529 
1530  // Also must look for a getter name which uses property syntax.
1531  Selector Sel = S.PP.getSelectorTable().getNullarySelector(Member);
1532  ObjCInterfaceDecl *IFace = MD->getClassInterface();
1533  if (!IFace)
1534  goto fail;
1535 
1536  ObjCMethodDecl *Getter;
1537  if ((Getter = IFace->lookupClassMethod(Sel))) {
1538  // Check the use of this method.
1539  if (S.DiagnoseUseOfDecl(Getter, MemberLoc))
1540  return ExprError();
1541  } else
1542  Getter = IFace->lookupPrivateMethod(Sel, false);
1543  // If we found a getter then this may be a valid dot-reference, we
1544  // will look for the matching setter, in case it is needed.
1545  Selector SetterSel =
1547  S.PP.getSelectorTable(),
1548  Member);
1549  ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1550  if (!Setter) {
1551  // If this reference is in an @implementation, also check for 'private'
1552  // methods.
1553  Setter = IFace->lookupPrivateMethod(SetterSel, false);
1554  }
1555 
1556  if (Setter && S.DiagnoseUseOfDecl(Setter, MemberLoc))
1557  return ExprError();
1558 
1559  if (Getter || Setter) {
1560  return new (S.Context) ObjCPropertyRefExpr(
1561  Getter, Setter, S.Context.PseudoObjectTy, VK_LValue,
1562  OK_ObjCProperty, MemberLoc, BaseExpr.get());
1563  }
1564 
1565  if (ShouldTryAgainWithRedefinitionType(S, BaseExpr))
1566  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1567  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1568 
1569  return ExprError(S.Diag(MemberLoc, diag::err_property_not_found)
1570  << MemberName << BaseType);
1571  }
1572 
1573  // Normal property access.
1574  return S.HandleExprPropertyRefExpr(OPT, BaseExpr.get(), OpLoc, MemberName,
1575  MemberLoc, SourceLocation(), QualType(),
1576  false);
1577  }
1578 
1579  // Handle 'field access' to vectors, such as 'V.xx'.
1580  if (BaseType->isExtVectorType()) {
1581  // FIXME: this expr should store IsArrow.
1582  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1583  ExprValueKind VK;
1584  if (IsArrow)
1585  VK = VK_LValue;
1586  else {
1587  if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(BaseExpr.get()))
1588  VK = POE->getSyntacticForm()->getValueKind();
1589  else
1590  VK = BaseExpr.get()->getValueKind();
1591  }
1592 
1593  QualType ret = CheckExtVectorComponent(S, BaseType, VK, OpLoc,
1594  Member, MemberLoc);
1595  if (ret.isNull())
1596  return ExprError();
1597  Qualifiers BaseQ =
1598  S.Context.getCanonicalType(BaseExpr.get()->getType()).getQualifiers();
1599  ret = S.Context.getQualifiedType(ret, BaseQ);
1600 
1601  return new (S.Context)
1602  ExtVectorElementExpr(ret, VK, BaseExpr.get(), *Member, MemberLoc);
1603  }
1604 
1605  // Adjust builtin-sel to the appropriate redefinition type if that's
1606  // not just a pointer to builtin-sel again.
1607  if (IsArrow && BaseType->isSpecificBuiltinType(BuiltinType::ObjCSel) &&
1609  BaseExpr = S.ImpCastExprToType(
1610  BaseExpr.get(), S.Context.getObjCSelRedefinitionType(), CK_BitCast);
1611  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1612  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1613  }
1614 
1615  // Failure cases.
1616  fail:
1617 
1618  // Recover from dot accesses to pointers, e.g.:
1619  // type *foo;
1620  // foo.bar
1621  // This is actually well-formed in two cases:
1622  // - 'type' is an Objective C type
1623  // - 'bar' is a pseudo-destructor name which happens to refer to
1624  // the appropriate pointer type
1625  if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
1626  if (!IsArrow && Ptr->getPointeeType()->isRecordType() &&
1627  MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
1628  S.Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
1629  << BaseType << int(IsArrow) << BaseExpr.get()->getSourceRange()
1630  << FixItHint::CreateReplacement(OpLoc, "->");
1631 
1632  // Recurse as an -> access.
1633  IsArrow = true;
1634  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1635  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1636  }
1637  }
1638 
1639  // If the user is trying to apply -> or . to a function name, it's probably
1640  // because they forgot parentheses to call that function.
1641  if (S.tryToRecoverWithCall(
1642  BaseExpr, S.PDiag(diag::err_member_reference_needs_call),
1643  /*complain*/ false,
1644  IsArrow ? &isPointerToRecordType : &isRecordType)) {
1645  if (BaseExpr.isInvalid())
1646  return ExprError();
1647  BaseExpr = S.DefaultFunctionArrayConversion(BaseExpr.get());
1648  return LookupMemberExpr(S, R, BaseExpr, IsArrow, OpLoc, SS,
1649  ObjCImpDecl, HasTemplateArgs, TemplateKWLoc);
1650  }
1651 
1652  S.Diag(OpLoc, diag::err_typecheck_member_reference_struct_union)
1653  << BaseType << BaseExpr.get()->getSourceRange() << MemberLoc;
1654 
1655  return ExprError();
1656 }
1657 
1658 /// The main callback when the parser finds something like
1659 /// expression . [nested-name-specifier] identifier
1660 /// expression -> [nested-name-specifier] identifier
1661 /// where 'identifier' encompasses a fairly broad spectrum of
1662 /// possibilities, including destructor and operator references.
1663 ///
1664 /// \param OpKind either tok::arrow or tok::period
1665 /// \param ObjCImpDecl the current Objective-C \@implementation
1666 /// decl; this is an ugly hack around the fact that Objective-C
1667 /// \@implementations aren't properly put in the context chain
1669  SourceLocation OpLoc,
1670  tok::TokenKind OpKind,
1671  CXXScopeSpec &SS,
1672  SourceLocation TemplateKWLoc,
1673  UnqualifiedId &Id,
1674  Decl *ObjCImpDecl) {
1675  if (SS.isSet() && SS.isInvalid())
1676  return ExprError();
1677 
1678  // Warn about the explicit constructor calls Microsoft extension.
1679  if (getLangOpts().MicrosoftExt &&
1681  Diag(Id.getSourceRange().getBegin(),
1682  diag::ext_ms_explicit_constructor_call);
1683 
1684  TemplateArgumentListInfo TemplateArgsBuffer;
1685 
1686  // Decompose the name into its component parts.
1687  DeclarationNameInfo NameInfo;
1688  const TemplateArgumentListInfo *TemplateArgs;
1689  DecomposeUnqualifiedId(Id, TemplateArgsBuffer,
1690  NameInfo, TemplateArgs);
1691 
1692  DeclarationName Name = NameInfo.getName();
1693  bool IsArrow = (OpKind == tok::arrow);
1694 
1695  NamedDecl *FirstQualifierInScope
1696  = (!SS.isSet() ? nullptr : FindFirstQualifierInScope(S, SS.getScopeRep()));
1697 
1698  // This is a postfix expression, so get rid of ParenListExprs.
1699  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
1700  if (Result.isInvalid()) return ExprError();
1701  Base = Result.get();
1702 
1703  if (Base->getType()->isDependentType() || Name.isDependentName() ||
1704  isDependentScopeSpecifier(SS)) {
1705  return ActOnDependentMemberExpr(Base, Base->getType(), IsArrow, OpLoc, SS,
1706  TemplateKWLoc, FirstQualifierInScope,
1707  NameInfo, TemplateArgs);
1708  }
1709 
1710  ActOnMemberAccessExtraArgs ExtraArgs = {S, Id, ObjCImpDecl};
1711  return BuildMemberReferenceExpr(Base, Base->getType(), OpLoc, IsArrow, SS,
1712  TemplateKWLoc, FirstQualifierInScope,
1713  NameInfo, TemplateArgs, S, &ExtraArgs);
1714 }
1715 
1716 ExprResult
1717 Sema::BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow,
1718  SourceLocation OpLoc, const CXXScopeSpec &SS,
1719  FieldDecl *Field, DeclAccessPair FoundDecl,
1720  const DeclarationNameInfo &MemberNameInfo) {
1721  // x.a is an l-value if 'a' has a reference type. Otherwise:
1722  // x.a is an l-value/x-value/pr-value if the base is (and note
1723  // that *x is always an l-value), except that if the base isn't
1724  // an ordinary object then we must have an rvalue.
1725  ExprValueKind VK = VK_LValue;
1727  if (!IsArrow) {
1728  if (BaseExpr->getObjectKind() == OK_Ordinary)
1729  VK = BaseExpr->getValueKind();
1730  else
1731  VK = VK_RValue;
1732  }
1733  if (VK != VK_RValue && Field->isBitField())
1734  OK = OK_BitField;
1735 
1736  // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
1737  QualType MemberType = Field->getType();
1738  if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
1739  MemberType = Ref->getPointeeType();
1740  VK = VK_LValue;
1741  } else {
1742  QualType BaseType = BaseExpr->getType();
1743  if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType();
1744 
1745  Qualifiers BaseQuals = BaseType.getQualifiers();
1746 
1747  // GC attributes are never picked up by members.
1748  BaseQuals.removeObjCGCAttr();
1749 
1750  // CVR attributes from the base are picked up by members,
1751  // except that 'mutable' members don't pick up 'const'.
1752  if (Field->isMutable()) BaseQuals.removeConst();
1753 
1754  Qualifiers MemberQuals =
1755  Context.getCanonicalType(MemberType).getQualifiers();
1756 
1757  assert(!MemberQuals.hasAddressSpace());
1758 
1759  Qualifiers Combined = BaseQuals + MemberQuals;
1760  if (Combined != MemberQuals)
1761  MemberType = Context.getQualifiedType(MemberType, Combined);
1762  }
1763 
1764  auto *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1765  if (!(CurMethod && CurMethod->isDefaulted()))
1766  UnusedPrivateFields.remove(Field);
1767 
1768  ExprResult Base = PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
1769  FoundDecl, Field);
1770  if (Base.isInvalid())
1771  return ExprError();
1772 
1773  // Build a reference to a private copy for non-static data members in
1774  // non-static member functions, privatized by OpenMP constructs.
1775  if (getLangOpts().OpenMP && IsArrow &&
1776  !CurContext->isDependentContext() &&
1777  isa<CXXThisExpr>(Base.get()->IgnoreParenImpCasts())) {
1778  if (auto *PrivateCopy = isOpenMPCapturedDecl(Field)) {
1779  return getOpenMPCapturedExpr(PrivateCopy, VK, OK,
1780  MemberNameInfo.getLoc());
1781  }
1782  }
1783 
1784  return BuildMemberExpr(*this, Context, Base.get(), IsArrow, OpLoc, SS,
1785  /*TemplateKWLoc=*/SourceLocation(), Field, FoundDecl,
1786  MemberNameInfo, MemberType, VK, OK);
1787 }
1788 
1789 /// Builds an implicit member access expression. The current context
1790 /// is known to be an instance method, and the given unqualified lookup
1791 /// set is known to contain only instance members, at least one of which
1792 /// is from an appropriate type.
1793 ExprResult
1795  SourceLocation TemplateKWLoc,
1796  LookupResult &R,
1797  const TemplateArgumentListInfo *TemplateArgs,
1798  bool IsKnownInstance, const Scope *S) {
1799  assert(!R.empty() && !R.isAmbiguous());
1800 
1801  SourceLocation loc = R.getNameLoc();
1802 
1803  // If this is known to be an instance access, go ahead and build an
1804  // implicit 'this' expression now.
1805  // 'this' expression now.
1806  QualType ThisTy = getCurrentThisType();
1807  assert(!ThisTy.isNull() && "didn't correctly pre-flight capture of 'this'");
1808 
1809  Expr *baseExpr = nullptr; // null signifies implicit access
1810  if (IsKnownInstance) {
1811  SourceLocation Loc = R.getNameLoc();
1812  if (SS.getRange().isValid())
1813  Loc = SS.getRange().getBegin();
1814  CheckCXXThisCapture(Loc);
1815  baseExpr = new (Context) CXXThisExpr(loc, ThisTy, /*isImplicit=*/true);
1816  }
1817 
1818  return BuildMemberReferenceExpr(baseExpr, ThisTy,
1819  /*OpLoc*/ SourceLocation(),
1820  /*IsArrow*/ true,
1821  SS, TemplateKWLoc,
1822  /*FirstQualifierInScope*/ nullptr,
1823  R, TemplateArgs, S);
1824 }
ObjCPropertyRefExpr - A dot-syntax expression to access an ObjC property.
Definition: ExprObjC.h:649
SourceLocation getLoc() const
getLoc - Returns the main location of the declaration name.
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
This is the scope of a C++ try statement.
Definition: Scope.h:101
static const Decl * getCanonicalDecl(const Decl *D)
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
ExtVectorDeclsType ExtVectorDecls
ExtVectorDecls - This is a list all the extended vector types.
Definition: Sema.h:547
ExternalSemaSource * getExternalSource() const
Definition: Sema.h:1214
Smart pointer class that efficiently represents Objective-C method names.
SelectorTable & getSelectorTable()
Definition: Preprocessor.h:834
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2397
QualType getPointeeType() const
Definition: Type.h:2410
A (possibly-)qualified type.
Definition: Type.h:640
Simple class containing the result of Sema::CorrectTypo.
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1136
bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace, ObjCMethodDecl *Method, ObjCIvarDecl *IV)
IvarBacksCurrentMethodAccessor - This routine returns &#39;true&#39; if &#39;IV&#39; is an ivar synthesized for &#39;Meth...
The reference may be to an instance member, but it might be invalid if so, because the context is not...
SourceRange getSourceRange() const LLVM_READONLY
Return the source range that covers this unqualified-id.
Definition: DeclSpec.h:1128
static MemberExpr * BuildMemberExpr(Sema &SemaRef, ASTContext &C, Expr *Base, bool isArrow, SourceLocation OpLoc, const CXXScopeSpec &SS, SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl, const DeclarationNameInfo &MemberNameInfo, QualType Ty, ExprValueKind VK, ExprObjectKind OK, const TemplateArgumentListInfo *TemplateArgs=nullptr)
Build a MemberExpr AST node.
DeclContext * getFunctionLevelDeclContext()
Definition: Sema.cpp:1174
static void diagnoseInstanceReference(Sema &SemaRef, const CXXScopeSpec &SS, NamedDecl *Rep, const DeclarationNameInfo &nameInfo)
Diagnose a reference to a field with no object available.
static CXXDependentScopeMemberExpr * Create(const ASTContext &C, Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs)
Definition: ExprCXX.cpp:1162
VarDecl * getVarDecl() const
Definition: Decl.h:2835
void setLookupName(DeclarationName Name)
Sets the name to look up.
Definition: Lookup.h:246
QualType CXXThisTypeOverride
When non-NULL, the C++ &#39;this&#39; expression is allowed despite the current context not being a non-stati...
Definition: Sema.h:5089
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:497
IMAKind
An instance of this object exists for each enum constant that is defined.
Definition: Decl.h:2761
bool isRecordType() const
Definition: Type.h:6190
bool isEmpty() const
No scope specifier.
Definition: DeclSpec.h:189
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1937
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1281
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
bool isExtVectorType() const
Definition: Type.h:6206
Defines the C++ template declaration subclasses.
The reference is definitely an implicit instance member access.
SourceLocation getBeginLoc() const
getBeginLoc - Retrieve the location of the first token.
Declaration of a variable template.
RedeclarationKind
Specifies whether (or how) name lookup is being performed for a redeclaration (vs.
Definition: Sema.h:3061
static bool IsInFnTryBlockHandler(const Scope *S)
Determine if the given scope is within a function-try-block handler.
const DeclAccessPair & getPair() const
Definition: UnresolvedSet.h:54
This file provides some common utility functions for processing Lambda related AST Constructs...
Represents a variable declaration or definition.
Definition: Decl.h:820
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:25
DeclarationName getLookupName() const
Gets the name to look up.
Definition: Lookup.h:241
ObjCIsaExpr - Represent X->isa and X.isa when X is an ObjC &#39;id&#39; type.
Definition: ExprObjC.h:1533
DiagnosticsEngine & Diags
Definition: Sema.h:321
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6530
DeclContext * computeDeclContext(QualType T)
Compute the DeclContext that is associated with the given type.
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
NamedDecl * getUnderlyingDecl()
Looks through UsingDecls and ObjCCompatibleAliasDecls for the underlying named decl.
Definition: Decl.h:431
bool isAmbiguous() const
Definition: Lookup.h:290
bool isInvalidDecl() const
Definition: DeclBase.h:555
QualType getObjCClassType() const
Represents the Objective-C Class type.
Definition: ASTContext.h:1875
void setBegin(SourceLocation b)
bool isStatic() const
Definition: DeclCXX.cpp:1849
protocol_range protocols() const
Definition: DeclObjC.h:2126
Defines the clang::Expr interface and subclasses for C++ expressions.
iterator begin(Source *source, bool LocalOnly=false)
The collection of all-type qualifiers we support.
Definition: Type.h:139
Qualifiers getQualifiers() const
Retrieve all qualifiers.
Expr * IgnoreImpCasts() LLVM_READONLY
IgnoreImpCasts - Skip past any implicit casts which might surround this expression.
Definition: Expr.h:3130
Represents a struct/union/class.
Definition: Decl.h:3572
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:297
bool Encloses(const DeclContext *DC) const
Determine whether this declaration context encloses the declaration context DC.
Definition: DeclBase.cpp:1120
One of these records is kept for each identifier that is lexed.
bool LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS, QualType ObjectType, bool EnteringContext, bool &MemberOfUnknownSpecialization, SourceLocation TemplateKWLoc=SourceLocation())
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Represents a class type in Objective C.
Definition: Type.h:5359
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:153
DeclarationName getCorrection() const
Gets the DeclarationName of the typo correction.
bool CheckQualifiedMemberReference(Expr *BaseExpr, QualType BaseType, const CXXScopeSpec &SS, const LookupResult &R)
static VarDecl * getVarTemplateSpecialization(Sema &S, VarTemplateDecl *VarTempl, const TemplateArgumentListInfo *TemplateArgs, const DeclarationNameInfo &MemberNameInfo, SourceLocation TemplateKWLoc)
ObjCMethodFamily
A family of Objective-C methods.
Base class for callback objects used by Sema::CorrectTypo to check the validity of a potential typo c...
Represents a member of a struct/union/class.
Definition: Decl.h:2554
The current expression is potentially evaluated at run time, which means that code may be generated t...
void removeConst()
Definition: Type.h:260
The reference may be to an unresolved using declaration and the context is not an instance method...
const DeclarationNameInfo & getLookupNameInfo() const
Gets the name info to look up.
Definition: Lookup.h:231
The iterator over UnresolvedSets.
Definition: UnresolvedSet.h:32
static bool ShouldTryAgainWithRedefinitionType(Sema &S, ExprResult &base)
Given that normal member access failed on the given expression, and given that the expression&#39;s type ...
int Category
Definition: Format.cpp:1608
bool isSpecificBuiltinType(unsigned K) const
Test for a particular builtin type.
Definition: Type.h:6311
bool Equals(const DeclContext *DC) const
Determine whether this declaration context is equivalent to the declaration context DC...
Definition: DeclBase.h:1889
Represents a C++ member access expression for which lookup produced a set of overloaded functions...
Definition: ExprCXX.h:3740
static int getPointAccessorIdx(char c)
Definition: Type.h:3154
bool isObjCSelType() const
Definition: Type.h:6255
ExtVectorElementExpr - This represents access to specific elements of a vector, and may occur on the ...
Definition: Expr.h:5234
ExprResult DefaultFunctionArrayConversion(Expr *E, bool Diagnose=true)
DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
Definition: SemaExpr.cpp:419
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:110
bool isDependentName() const
Determines whether the name itself is dependent, e.g., because it involves a C++ type that is itself ...
static Selector constructSetterSelector(IdentifierTable &Idents, SelectorTable &SelTable, const IdentifierInfo *Name)
Return the default setter selector for the given identifier.
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:928
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2632
Selector getNullarySelector(IdentifierInfo *ID)
void resolveKind()
Resolves the result kind of the lookup, possibly hiding decls.
Definition: SemaLookup.cpp:471
Represents the results of name lookup.
Definition: Lookup.h:47
PtrTy get() const
Definition: Ownership.h:174
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
ObjCMethodDecl * getCurMethodDecl()
getCurMethodDecl - If inside of a method body, this returns a pointer to the method decl for the meth...
Definition: Sema.cpp:1199
A convenient class for passing around template argument information.
Definition: TemplateBase.h:552
static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef, const LookupResult &R)
The given lookup names class member(s) and is not being used for an address-of-member expression...
bool hasAddressSpace() const
Definition: Type.h:353
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
ExprResult BuildAnonymousStructUnionMemberReference(const CXXScopeSpec &SS, SourceLocation nameLoc, IndirectFieldDecl *indirectField, DeclAccessPair FoundDecl=DeclAccessPair::make(nullptr, AS_none), Expr *baseObjectExpr=nullptr, SourceLocation opLoc=SourceLocation())
static bool isRecordType(QualType T)
TemplateSpecializationKind getTemplateSpecializationKind() const
If this variable is an instantiation of a variable template or a static data member of a class templa...
Definition: Decl.cpp:2406
The reference is a contextually-permitted abstract member reference.
CanQualType PseudoObjectTy
Definition: ASTContext.h:1054
QualType getObjCClassRedefinitionType() const
Retrieve the type that Class has been defined to, which may be different from the built-in Class if C...
Definition: ASTContext.h:1653
Expr * IgnoreParenCasts() LLVM_READONLY
IgnoreParenCasts - Ignore parentheses and casts.
Definition: Expr.cpp:2544
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
CXXRecordDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:736
bool declaresSameEntity(const Decl *D1, const Decl *D2)
Determine whether two declarations declare the same entity.
Definition: DeclBase.h:1167
TypoExpr - Internal placeholder for expressions where typo correction still needs to be performed and...
Definition: Expr.h:5720
ObjCMethodDecl * lookupClassMethod(Selector Sel) const
Lookup a class method for a given selector.
Definition: DeclObjC.h:1849
ExprResult ActOnDependentMemberExpr(Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec &SS, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs)
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
The current expression occurs within a discarded statement.
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:2061
Preprocessor & PP
Definition: Sema.h:318
const LangOptions & getLangOpts() const
Definition: Sema.h:1204
The reference may be an implicit instance member access.
An ordinary object is located at an address in memory.
Definition: Specifiers.h:126
bool isUnevaluatedContext() const
Determines whether we are currently in a context that is not evaluated as per C++ [expr] p5...
Definition: Sema.h:7507
Represents an ObjC class declaration.
Definition: DeclObjC.h:1169
ExprResult BuildMemberReferenceExpr(Expr *Base, QualType BaseType, SourceLocation OpLoc, bool IsArrow, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierInScope, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs, const Scope *S, ActOnMemberAccessExtraArgs *ExtraArgs=nullptr)
void addDecl(NamedDecl *D)
Add a declaration to these results with its natural access.
Definition: Lookup.h:415
Member name lookup, which finds the names of class/struct/union members.
Definition: Sema.h:3024
ObjCInterfaceDecl * getInterface() const
Gets the interface declaration for this object type, if the base type really is an interface...
Definition: Type.h:5594
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const
Retrieve a nested-name-specifier with location information, copied into the given AST context...
Definition: DeclSpec.cpp:143
unsigned getLength() const
Efficiently return the length of this identifier info.
Sema::RedeclarationKind redeclarationKind() const
Definition: Lookup.h:266
Represents the this expression in C++.
Definition: ExprCXX.h:1046
llvm::SmallPtrSet< const CXXRecordDecl *, 4 > BaseSet
RAII class used to determine whether SFINAE has trapped any errors that occur during template argumen...
Definition: Sema.h:7516
unsigned getFlags() const
getFlags - Return the flags for this scope.
Definition: Scope.h:217
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:277
All possible referrents are instance members and the current context is not an instance method...
bool DiagnoseUseOfDecl(NamedDecl *D, ArrayRef< SourceLocation > Locs, const ObjCInterfaceDecl *UnknownObjCClass=nullptr, bool ObjCPropertyAccess=false, bool AvoidPartialAvailabilityChecks=false)
Determine whether the use of this declaration is valid, and emit any corresponding diagnostics...
Definition: SemaExpr.cpp:206
void recordUseOfWeak(const ExprT *E, bool IsRead=true)
Record that a weak object was accessed.
Definition: ScopeInfo.h:984
SourceRange getRange() const
Definition: DeclSpec.h:68
QualType getUsageType(QualType objectType) const
Retrieve the type of this instance variable when viewed as a member of a specific object type...
Definition: DeclObjC.cpp:1806
std::string getAsString(const LangOptions &LO) const
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:136
static bool LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R, Expr *BaseExpr, const RecordType *RTy, SourceLocation OpLoc, bool IsArrow, CXXScopeSpec &SS, bool HasTemplateArgs, SourceLocation TemplateKWLoc, TypoExpr *&TE)
The current expression is potentially evaluated, but any declarations referenced inside that expressi...
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:640
Expr - This represents one expression.
Definition: Expr.h:106
DeclResult CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc, SourceLocation TemplateNameLoc, const TemplateArgumentListInfo &TemplateArgs)
LookupNameKind
Describes the kind of name lookup to perform.
Definition: Sema.h:3012
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:107
static bool IsRGBA(char c)
Determine whether input char is from rgba component set.
int Id
Definition: ASTDiff.cpp:191
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6593
std::string getAsString() const
getNameAsString - Retrieve the human-readable string for this name.
Defines the clang::Preprocessor interface.
All possible referrents are instance members of an unrelated class.
DeclContext * getDeclContext()
Definition: DeclBase.h:434
Represents a C++ template name within the type system.
Definition: TemplateName.h:178
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:7494
UnqualifiedIdKind getKind() const
Determine what kind of name we have.
Definition: DeclSpec.h:1010
The current expression and its subexpressions occur within an unevaluated operand (C++11 [expr]p7)...
QualType getType() const
Definition: Expr.h:128
ObjCIvarDecl * lookupInstanceVariable(IdentifierInfo *IVarName, ObjCInterfaceDecl *&ClassDeclared)
Definition: DeclObjC.cpp:621
bool isSingleResult() const
Determines if this names a single result which is not an unresolved value using decl.
Definition: Lookup.h:297
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1769
bool isInvalid() const
Definition: Ownership.h:170
SourceLocation getEnd() const
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:1865
static void DiagnoseQualifiedMemberReference(Sema &SemaRef, Expr *BaseExpr, QualType BaseType, const CXXScopeSpec &SS, NamedDecl *rep, const DeclarationNameInfo &nameInfo)
We know that the given qualified member reference points only to declarations which do not belong to ...
ExprResult BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS, SourceLocation TemplateKWLoc, LookupResult &R, const TemplateArgumentListInfo *TemplateArgs, const Scope *S)
Builds an expression which might be an implicit member expression.
A member reference to an MSPropertyDecl.
Definition: ExprCXX.h:805
bool isUsable() const
Definition: Ownership.h:171
This template specialization was implicitly instantiated from a template.
Definition: Specifiers.h:152
bool isObjCClass() const
Definition: Type.h:5428
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:705
bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is provably not derived from the type Base.
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:412
bool isUnresolvableResult() const
Definition: Lookup.h:306
RecordDecl * getDecl() const
Definition: Type.h:4149
NestedNameSpecifier * getScopeRep() const
Retrieve the representation of the nested-name-specifier.
Definition: DeclSpec.h:76
chain_iterator chain_end() const
Definition: Decl.h:2826
QualType getObjCIdRedefinitionType() const
Retrieve the type that id has been defined to, which may be different from the built-in id if id has ...
Definition: ASTContext.h:1640
static bool isPointerToRecordType(QualType T)
ArrayRef< NamedDecl * >::const_iterator chain_iterator
Definition: Decl.h:2820
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:157
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5441
static ExprResult BuildMSPropertyRefExpr(Sema &S, Expr *BaseExpr, bool IsArrow, const CXXScopeSpec &SS, MSPropertyDecl *PD, const DeclarationNameInfo &NameInfo)
bool isAccessorWithinNumElements(char c, bool isNumericAccessor) const
Definition: Type.h:3199
Encodes a location in the source.
QualType getObjCSelRedefinitionType() const
Retrieve the type that &#39;SEL&#39; has been defined to, which may be different from the built-in &#39;SEL&#39; if &#39;...
Definition: ASTContext.h:1666
DeclarationName getName() const
getName - Returns the embedded declaration name.
QualType getElementType() const
Definition: Type.h:3063
IdentifierTable & getIdentifierTable()
Definition: Preprocessor.h:832
bool isOverloadedResult() const
Determines if the results are overloaded.
Definition: Lookup.h:302
ExprObjectKind
A further classification of the kind of object referenced by an l-value or x-value.
Definition: Specifiers.h:124
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2051
QualType getExtVectorType(QualType VectorType, unsigned NumElts) const
Return the unique reference to an extended vector type of the specified element type and size...
ExprResult DefaultLvalueConversion(Expr *E)
Definition: SemaExpr.cpp:533
The reference may be to an unresolved using declaration.
const char * getNameStart() const
Return the beginning of the actual null-terminated string for this identifier.
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
bool forallBases(ForallBasesCallback BaseMatches, bool AllowShortCircuit=true) const
Determines if the given callback holds for all the direct or indirect base classes of this type...
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:726
static Decl * FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy, IdentifierInfo *Member, const Selector &Sel, ASTContext &Context)
bool isSuperClassOf(const ObjCInterfaceDecl *I) const
isSuperClassOf - Return true if this class is the specified class or is a super class of the specifie...
Definition: DeclObjC.h:1807
bool isThisOutsideMemberFunctionBody(QualType BaseType)
Determine whether the given type is the type of *this that is used outside of the body of a member fu...
void removeObjCGCAttr()
Definition: Type.h:311
bool RequireCompleteDeclContext(CXXScopeSpec &SS, DeclContext *DC)
Require that the context specified by SS be complete.
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:194
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2297
static MemberExpr * Create(const ASTContext &C, Expr *base, bool isarrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *memberdecl, DeclAccessPair founddecl, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *targs, QualType ty, ExprValueKind VK, ExprObjectKind OK)
Definition: Expr.cpp:1472
Sema & getSema() const
Get the Sema object that this lookup result is searching with.
Definition: Lookup.h:601
A POD class for pairing a NamedDecl* with an access specifier.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK, SourceLocation PointOfInstantiation=SourceLocation())
For a static data member that was instantiated from a static data member of a class template...
Definition: Decl.cpp:2461
void diagnoseTypo(const TypoCorrection &Correction, const PartialDiagnostic &TypoDiag, bool ErrorRecovery=true)
QualType getTypedefType(const TypedefNameDecl *Decl, QualType Canon=QualType()) const
Return the unique reference to the type for the specified typedef-name decl.
void MarkMemberReferenced(MemberExpr *E)
Perform reference-marking and odr-use handling for a MemberExpr.
Definition: SemaExpr.cpp:15418
bool isObjCId() const
Definition: Type.h:5424
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
ObjCMethodDecl * lookupPrivateMethod(const Selector &Sel, bool Instance=true) const
Lookup a method in the classes implementation hierarchy.
Definition: DeclObjC.cpp:740
ObjCPropertyDecl * FindPropertyDeclaration(const IdentifierInfo *PropertyId, ObjCPropertyQueryKind QueryKind) const
FindPropertyDeclaration - Finds declaration of the property given its name in &#39;PropertyId&#39; and return...
Definition: DeclObjC.cpp:236
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1272
const Scope * getParent() const
getParent - Return the scope that this is nested in.
Definition: Scope.h:225
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK, ExprValueKind VK=VK_RValue, const CXXCastPath *BasePath=nullptr, CheckedConversionKind CCK=CCK_ImplicitConversion)
ImpCastExprToType - If Expr is not of type &#39;Type&#39;, insert an implicit cast.
Definition: Sema.cpp:470
bool isRecord() const
Definition: DeclBase.h:1844
The current expression occurs within an unevaluated operand that unconditionally permits abstract ref...
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2800
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
AccessSpecifier getAccess() const
Definition: DeclBase.h:469
static ExprResult LookupMemberExpr(Sema &S, LookupResult &R, ExprResult &BaseExpr, bool &IsArrow, SourceLocation OpLoc, CXXScopeSpec &SS, Decl *ObjCImpDecl, bool HasTemplateArgs, SourceLocation TemplateKWLoc)
Look up the given member of the given non-type-dependent expression.
NamedDecl * getCorrectionDecl() const
Gets the pointer to the declaration of the typo correction.
DeclarationName - The name of a declaration.
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:506
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2171
bool tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD, bool ForceComplain=false, bool(*IsPlausibleResult)(QualType)=nullptr)
Try to recover by turning the given expression into a call.
Definition: Sema.cpp:1749
const ObjCObjectType * getObjectType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5656
ExprResult ActOnMemberAccessExpr(Scope *S, Expr *Base, SourceLocation OpLoc, tok::TokenKind OpKind, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Member, Decl *ObjCImpDecl)
The main callback when the parser finds something like expression .
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Expr * IgnoreParenImpCasts() LLVM_READONLY
IgnoreParenImpCasts - Ignore parentheses and implicit casts.
Definition: Expr.cpp:2631
ExprResult BuildImplicitMemberExpr(const CXXScopeSpec &SS, SourceLocation TemplateKWLoc, LookupResult &R, const TemplateArgumentListInfo *TemplateArgs, bool IsDefiniteInstance, const Scope *S)
Builds an implicit member access expression.
Represents a pointer to an Objective C object.
Definition: Type.h:5615
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2549
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4139
This is the scope for a function-level C++ try or catch scope.
Definition: Scope.h:104
SourceRange getSourceRange() const LLVM_READONLY
getSourceRange - The range of the declaration name.
chain_iterator chain_begin() const
Definition: Decl.h:2825
FunctionDecl * getCurFunctionDecl()
getCurFunctionDecl - If inside of a function body, this returns a pointer to the function decl for th...
Definition: Sema.cpp:1194
bool isFunctionType() const
Definition: Type.h:6113
ExprResult HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, Expr *BaseExpr, SourceLocation OpLoc, DeclarationName MemberName, SourceLocation MemberLoc, SourceLocation SuperLoc, QualType SuperType, bool Super)
HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an objective C interface...
ExtVectorType - Extended vector type.
Definition: Type.h:3147
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2533
CanQualType BoundMemberTy
Definition: ASTContext.h:1052
SmallVector< ExpressionEvaluationContextRecord, 8 > ExprEvalContexts
A stack of expression evaluation contexts.
Definition: Sema.h:1017
ExprResult BuildFieldReferenceExpr(Expr *BaseExpr, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec &SS, FieldDecl *Field, DeclAccessPair FoundDecl, const DeclarationNameInfo &MemberNameInfo)
qual_range quals() const
Definition: Type.h:5738
Sema::LookupNameKind getLookupKind() const
Gets the kind of lookup to perform.
Definition: Lookup.h:251
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:129
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:577
bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx, bool InUnqualifiedLookup=false)
Perform qualified name lookup into a given context.
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2257
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
The reference may be to an instance member, but it is invalid if so, because the context is from an u...
ExprResult PerformMemberExprBaseConversion(Expr *Base, bool IsArrow)
Perform conversions on the LHS of a member access expression.
Reading or writing from this object requires a barrier call.
Definition: Type.h:170
static UnresolvedMemberExpr * Create(const ASTContext &C, bool HasUnresolvedUsing, Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, const DeclarationNameInfo &MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs, UnresolvedSetIterator Begin, UnresolvedSetIterator End)
Definition: ExprCXX.cpp:1264
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2596
ActionResult< Expr * > ExprResult
Definition: Ownership.h:267
bool isMutable() const
Determines whether this field is mutable (C++ only).
Definition: Decl.h:2629
Represents a C++ struct/union/class.
Definition: DeclCXX.h:308
bool isValid() const
sema::FunctionScopeInfo * getCurFunction() const
Definition: Sema.h:1331
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:5920
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1942
bool isRValue() const
Definition: Expr.h:250
static bool IsValidOpenCLComponentSwizzleLength(unsigned len)
TypoExpr * CorrectTypoDelayed(const DeclarationNameInfo &Typo, Sema::LookupNameKind LookupKind, Scope *S, CXXScopeSpec *SS, std::unique_ptr< CorrectionCandidateCallback > CCC, TypoDiagnosticGenerator TDG, TypoRecoveryCallback TRC, CorrectTypoKind Mode, DeclContext *MemberContext=nullptr, bool EnteringContext=false, const ObjCObjectPointerType *OPT=nullptr)
Try to "correct" a typo in the source code by finding visible declarations whose names are similar to...
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:129
iterator end() const
Definition: Lookup.h:325
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:268
ExprResult ExprError()
Definition: Ownership.h:283
unsigned getNumElements() const
Definition: Type.h:3064
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:1946
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:980
const Scope * getFnParent() const
getFnParent - Return the closest scope that is a function body.
Definition: Scope.h:229
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:818
bool isPointerType() const
Definition: Type.h:6117
void setBaseObjectType(QualType T)
Sets the base object type for this lookup.
Definition: Lookup.h:409
The reference is definitely not an instance member access.
void suppressDiagnostics()
Suppress the diagnostics that would normally fire because of this lookup.
Definition: Lookup.h:572
An instance of this class represents the declaration of a property member.
Definition: DeclCXX.h:3915
void diagnoseMissingTemplateArguments(TemplateName Name, SourceLocation Loc)
QualType getType() const
Definition: Decl.h:651
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:114
bool empty() const
Return true if no decls were found.
Definition: Lookup.h:328
static Decl * FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl *PDecl, IdentifierInfo *Member, const Selector &Sel, ASTContext &Context)
static int getNumericAccessorIdx(char c)
Definition: Type.h:3164
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:319
TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo, Sema::LookupNameKind LookupKind, Scope *S, CXXScopeSpec *SS, std::unique_ptr< CorrectionCandidateCallback > CCC, CorrectTypoKind Mode, DeclContext *MemberContext=nullptr, bool EnteringContext=false, const ObjCObjectPointerType *OPT=nullptr, bool RecordFailure=true)
Try to "correct" a typo in the source code by finding visible declarations whose names are similar to...
This represents a decl that may have a name.
Definition: Decl.h:248
ObjCMethodDecl * getInstanceMethod(Selector Sel, bool AllowHidden=false) const
Definition: DeclObjC.h:1084
AccessControl getAccessControl() const
Definition: DeclObjC.h:1981
iterator begin() const
Definition: Lookup.h:324
SourceLocation getNameLoc() const
Gets the location of the identifier.
Definition: Lookup.h:595
static QualType CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK, SourceLocation OpLoc, const IdentifierInfo *CompName, SourceLocation CompLoc)
Check an ext-vector component access expression.
NamedDecl * getRepresentativeDecl() const
Fetches a representative decl. Useful for lazy diagnostics.
Definition: Lookup.h:513
SourceLocation getBegin() const
void WillReplaceSpecifier(bool ForceReplacement)
ObjCCategoryImplDecl - An object of this class encapsulates a category @implementation declaration...
Definition: DeclObjC.h:2496
void clear()
Clears out any current state.
Definition: Lookup.h:543
The current expression occurs within a braced-init-list within an unevaluated operand.
SourceLocation getLocation() const
Definition: DeclBase.h:425
static bool isProvablyNotDerivedFrom(Sema &SemaRef, CXXRecordDecl *Record, const BaseSet &Bases)
Determines if the given class is provably not derived from all of the prospective base classes...
bool isCXXInstanceMember() const
Determine whether the given declaration is an instance member of a C++ class.
Definition: Decl.cpp:1718
bool hasErrorOccurred() const
Determine whether any SFINAE errors have been trapped.
Definition: Sema.h:7547
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1064
bool isTransparentContext() const
isTransparentContext - Determines whether this context is a "transparent" context, meaning that the members declared in this context are semantically declared in the nearest enclosing non-transparent (opaque) context but are lexically declared in this context.
Definition: DeclBase.cpp:1082