clang  6.0.0svn
SemaCast.cpp
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1 //===--- SemaCast.cpp - Semantic Analysis for Casts -----------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements semantic analysis for cast expressions, including
11 // 1) C-style casts like '(int) x'
12 // 2) C++ functional casts like 'int(x)'
13 // 3) C++ named casts like 'static_cast<int>(x)'
14 //
15 //===----------------------------------------------------------------------===//
16 
18 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/ExprObjC.h"
22 #include "clang/AST/RecordLayout.h"
24 #include "clang/Basic/TargetInfo.h"
25 #include "clang/Lex/Preprocessor.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include <set>
29 using namespace clang;
30 
31 
32 
34  TC_NotApplicable, ///< The cast method is not applicable.
35  TC_Success, ///< The cast method is appropriate and successful.
36  TC_Failed ///< The cast method is appropriate, but failed. A
37  ///< diagnostic has been emitted.
38 };
39 
40 enum CastType {
41  CT_Const, ///< const_cast
42  CT_Static, ///< static_cast
43  CT_Reinterpret, ///< reinterpret_cast
44  CT_Dynamic, ///< dynamic_cast
45  CT_CStyle, ///< (Type)expr
46  CT_Functional ///< Type(expr)
47 };
48 
49 namespace {
50  struct CastOperation {
51  CastOperation(Sema &S, QualType destType, ExprResult src)
52  : Self(S), SrcExpr(src), DestType(destType),
53  ResultType(destType.getNonLValueExprType(S.Context)),
54  ValueKind(Expr::getValueKindForType(destType)),
55  Kind(CK_Dependent), IsARCUnbridgedCast(false) {
56 
57  if (const BuiltinType *placeholder =
58  src.get()->getType()->getAsPlaceholderType()) {
59  PlaceholderKind = placeholder->getKind();
60  } else {
61  PlaceholderKind = (BuiltinType::Kind) 0;
62  }
63  }
64 
65  Sema &Self;
66  ExprResult SrcExpr;
67  QualType DestType;
68  QualType ResultType;
69  ExprValueKind ValueKind;
70  CastKind Kind;
71  BuiltinType::Kind PlaceholderKind;
72  CXXCastPath BasePath;
73  bool IsARCUnbridgedCast;
74 
75  SourceRange OpRange;
76  SourceRange DestRange;
77 
78  // Top-level semantics-checking routines.
79  void CheckConstCast();
80  void CheckReinterpretCast();
81  void CheckStaticCast();
82  void CheckDynamicCast();
83  void CheckCXXCStyleCast(bool FunctionalCast, bool ListInitialization);
84  void CheckCStyleCast();
85 
86  /// Complete an apparently-successful cast operation that yields
87  /// the given expression.
88  ExprResult complete(CastExpr *castExpr) {
89  // If this is an unbridged cast, wrap the result in an implicit
90  // cast that yields the unbridged-cast placeholder type.
91  if (IsARCUnbridgedCast) {
92  castExpr = ImplicitCastExpr::Create(Self.Context,
94  CK_Dependent, castExpr, nullptr,
95  castExpr->getValueKind());
96  }
97  return castExpr;
98  }
99 
100  // Internal convenience methods.
101 
102  /// Try to handle the given placeholder expression kind. Return
103  /// true if the source expression has the appropriate placeholder
104  /// kind. A placeholder can only be claimed once.
105  bool claimPlaceholder(BuiltinType::Kind K) {
106  if (PlaceholderKind != K) return false;
107 
108  PlaceholderKind = (BuiltinType::Kind) 0;
109  return true;
110  }
111 
112  bool isPlaceholder() const {
113  return PlaceholderKind != 0;
114  }
115  bool isPlaceholder(BuiltinType::Kind K) const {
116  return PlaceholderKind == K;
117  }
118 
119  void checkCastAlign() {
120  Self.CheckCastAlign(SrcExpr.get(), DestType, OpRange);
121  }
122 
123  void checkObjCConversion(Sema::CheckedConversionKind CCK) {
125 
126  Expr *src = SrcExpr.get();
127  if (Self.CheckObjCConversion(OpRange, DestType, src, CCK) ==
129  IsARCUnbridgedCast = true;
130  SrcExpr = src;
131  }
132 
133  /// Check for and handle non-overload placeholder expressions.
134  void checkNonOverloadPlaceholders() {
135  if (!isPlaceholder() || isPlaceholder(BuiltinType::Overload))
136  return;
137 
138  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
139  if (SrcExpr.isInvalid())
140  return;
141  PlaceholderKind = (BuiltinType::Kind) 0;
142  }
143  };
144 }
145 
146 static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
147  QualType DestType);
148 
149 // The Try functions attempt a specific way of casting. If they succeed, they
150 // return TC_Success. If their way of casting is not appropriate for the given
151 // arguments, they return TC_NotApplicable and *may* set diag to a diagnostic
152 // to emit if no other way succeeds. If their way of casting is appropriate but
153 // fails, they return TC_Failed and *must* set diag; they can set it to 0 if
154 // they emit a specialized diagnostic.
155 // All diagnostics returned by these functions must expect the same three
156 // arguments:
157 // %0: Cast Type (a value from the CastType enumeration)
158 // %1: Source Type
159 // %2: Destination Type
160 static TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr,
161  QualType DestType, bool CStyle,
162  CastKind &Kind,
163  CXXCastPath &BasePath,
164  unsigned &msg);
165 static TryCastResult TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr,
166  QualType DestType, bool CStyle,
167  SourceRange OpRange,
168  unsigned &msg,
169  CastKind &Kind,
170  CXXCastPath &BasePath);
172  QualType DestType, bool CStyle,
173  SourceRange OpRange,
174  unsigned &msg,
175  CastKind &Kind,
176  CXXCastPath &BasePath);
177 static TryCastResult TryStaticDowncast(Sema &Self, CanQualType SrcType,
178  CanQualType DestType, bool CStyle,
179  SourceRange OpRange,
180  QualType OrigSrcType,
181  QualType OrigDestType, unsigned &msg,
182  CastKind &Kind,
183  CXXCastPath &BasePath);
185  QualType SrcType,
186  QualType DestType,bool CStyle,
187  SourceRange OpRange,
188  unsigned &msg,
189  CastKind &Kind,
190  CXXCastPath &BasePath);
191 
192 static TryCastResult TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr,
193  QualType DestType,
195  SourceRange OpRange,
196  unsigned &msg, CastKind &Kind,
197  bool ListInitialization);
198 static TryCastResult TryStaticCast(Sema &Self, ExprResult &SrcExpr,
199  QualType DestType,
201  SourceRange OpRange,
202  unsigned &msg, CastKind &Kind,
203  CXXCastPath &BasePath,
204  bool ListInitialization);
205 static TryCastResult TryConstCast(Sema &Self, ExprResult &SrcExpr,
206  QualType DestType, bool CStyle,
207  unsigned &msg);
208 static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
209  QualType DestType, bool CStyle,
210  SourceRange OpRange,
211  unsigned &msg,
212  CastKind &Kind);
213 
214 
215 /// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
218  SourceLocation LAngleBracketLoc, Declarator &D,
219  SourceLocation RAngleBracketLoc,
220  SourceLocation LParenLoc, Expr *E,
221  SourceLocation RParenLoc) {
222 
223  assert(!D.isInvalidType());
224 
225  TypeSourceInfo *TInfo = GetTypeForDeclaratorCast(D, E->getType());
226  if (D.isInvalidType())
227  return ExprError();
228 
229  if (getLangOpts().CPlusPlus) {
230  // Check that there are no default arguments (C++ only).
231  CheckExtraCXXDefaultArguments(D);
232  }
233 
234  return BuildCXXNamedCast(OpLoc, Kind, TInfo, E,
235  SourceRange(LAngleBracketLoc, RAngleBracketLoc),
236  SourceRange(LParenLoc, RParenLoc));
237 }
238 
241  TypeSourceInfo *DestTInfo, Expr *E,
242  SourceRange AngleBrackets, SourceRange Parens) {
243  ExprResult Ex = E;
244  QualType DestType = DestTInfo->getType();
245 
246  // If the type is dependent, we won't do the semantic analysis now.
247  bool TypeDependent =
248  DestType->isDependentType() || Ex.get()->isTypeDependent();
249 
250  CastOperation Op(*this, DestType, E);
251  Op.OpRange = SourceRange(OpLoc, Parens.getEnd());
252  Op.DestRange = AngleBrackets;
253 
254  switch (Kind) {
255  default: llvm_unreachable("Unknown C++ cast!");
256 
257  case tok::kw_const_cast:
258  if (!TypeDependent) {
259  Op.CheckConstCast();
260  if (Op.SrcExpr.isInvalid())
261  return ExprError();
262  DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
263  }
264  return Op.complete(CXXConstCastExpr::Create(Context, Op.ResultType,
265  Op.ValueKind, Op.SrcExpr.get(), DestTInfo,
266  OpLoc, Parens.getEnd(),
267  AngleBrackets));
268 
269  case tok::kw_dynamic_cast: {
270  if (!TypeDependent) {
271  Op.CheckDynamicCast();
272  if (Op.SrcExpr.isInvalid())
273  return ExprError();
274  }
275  return Op.complete(CXXDynamicCastExpr::Create(Context, Op.ResultType,
276  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
277  &Op.BasePath, DestTInfo,
278  OpLoc, Parens.getEnd(),
279  AngleBrackets));
280  }
281  case tok::kw_reinterpret_cast: {
282  if (!TypeDependent) {
283  Op.CheckReinterpretCast();
284  if (Op.SrcExpr.isInvalid())
285  return ExprError();
286  DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
287  }
288  return Op.complete(CXXReinterpretCastExpr::Create(Context, Op.ResultType,
289  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
290  nullptr, DestTInfo, OpLoc,
291  Parens.getEnd(),
292  AngleBrackets));
293  }
294  case tok::kw_static_cast: {
295  if (!TypeDependent) {
296  Op.CheckStaticCast();
297  if (Op.SrcExpr.isInvalid())
298  return ExprError();
299  DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
300  }
301 
302  return Op.complete(CXXStaticCastExpr::Create(Context, Op.ResultType,
303  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
304  &Op.BasePath, DestTInfo,
305  OpLoc, Parens.getEnd(),
306  AngleBrackets));
307  }
308  }
309 }
310 
311 /// Try to diagnose a failed overloaded cast. Returns true if
312 /// diagnostics were emitted.
314  SourceRange range, Expr *src,
315  QualType destType,
316  bool listInitialization) {
317  switch (CT) {
318  // These cast kinds don't consider user-defined conversions.
319  case CT_Const:
320  case CT_Reinterpret:
321  case CT_Dynamic:
322  return false;
323 
324  // These do.
325  case CT_Static:
326  case CT_CStyle:
327  case CT_Functional:
328  break;
329  }
330 
331  QualType srcType = src->getType();
332  if (!destType->isRecordType() && !srcType->isRecordType())
333  return false;
334 
336  InitializationKind initKind
338  range, listInitialization)
340  listInitialization)
341  : InitializationKind::CreateCast(/*type range?*/ range);
342  InitializationSequence sequence(S, entity, initKind, src);
343 
344  assert(sequence.Failed() && "initialization succeeded on second try?");
345  switch (sequence.getFailureKind()) {
346  default: return false;
347 
350  break;
351  }
352 
353  OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
354 
355  unsigned msg = 0;
357 
358  switch (sequence.getFailedOverloadResult()) {
359  case OR_Success: llvm_unreachable("successful failed overload");
361  if (candidates.empty())
362  msg = diag::err_ovl_no_conversion_in_cast;
363  else
364  msg = diag::err_ovl_no_viable_conversion_in_cast;
365  howManyCandidates = OCD_AllCandidates;
366  break;
367 
368  case OR_Ambiguous:
369  msg = diag::err_ovl_ambiguous_conversion_in_cast;
370  howManyCandidates = OCD_ViableCandidates;
371  break;
372 
373  case OR_Deleted:
374  msg = diag::err_ovl_deleted_conversion_in_cast;
375  howManyCandidates = OCD_ViableCandidates;
376  break;
377  }
378 
379  S.Diag(range.getBegin(), msg)
380  << CT << srcType << destType
381  << range << src->getSourceRange();
382 
383  candidates.NoteCandidates(S, howManyCandidates, src);
384 
385  return true;
386 }
387 
388 /// Diagnose a failed cast.
389 static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
390  SourceRange opRange, Expr *src, QualType destType,
391  bool listInitialization) {
392  if (msg == diag::err_bad_cxx_cast_generic &&
393  tryDiagnoseOverloadedCast(S, castType, opRange, src, destType,
394  listInitialization))
395  return;
396 
397  S.Diag(opRange.getBegin(), msg) << castType
398  << src->getType() << destType << opRange << src->getSourceRange();
399 
400  // Detect if both types are (ptr to) class, and note any incompleteness.
401  int DifferentPtrness = 0;
402  QualType From = destType;
403  if (auto Ptr = From->getAs<PointerType>()) {
404  From = Ptr->getPointeeType();
405  DifferentPtrness++;
406  }
407  QualType To = src->getType();
408  if (auto Ptr = To->getAs<PointerType>()) {
409  To = Ptr->getPointeeType();
410  DifferentPtrness--;
411  }
412  if (!DifferentPtrness) {
413  auto RecFrom = From->getAs<RecordType>();
414  auto RecTo = To->getAs<RecordType>();
415  if (RecFrom && RecTo) {
416  auto DeclFrom = RecFrom->getAsCXXRecordDecl();
417  if (!DeclFrom->isCompleteDefinition())
418  S.Diag(DeclFrom->getLocation(), diag::note_type_incomplete)
419  << DeclFrom->getDeclName();
420  auto DeclTo = RecTo->getAsCXXRecordDecl();
421  if (!DeclTo->isCompleteDefinition())
422  S.Diag(DeclTo->getLocation(), diag::note_type_incomplete)
423  << DeclTo->getDeclName();
424  }
425  }
426 }
427 
428 /// UnwrapDissimilarPointerTypes - Like Sema::UnwrapSimilarPointerTypes,
429 /// this removes one level of indirection from both types, provided that they're
430 /// the same kind of pointer (plain or to-member). Unlike the Sema function,
431 /// this one doesn't care if the two pointers-to-member don't point into the
432 /// same class. This is because CastsAwayConstness doesn't care.
433 /// And additionally, it handles C++ references. If both the types are
434 /// references, then their pointee types are returned,
435 /// else if only one of them is reference, it's pointee type is returned,
436 /// and the other type is returned as-is.
438  const PointerType *T1PtrType = T1->getAs<PointerType>(),
439  *T2PtrType = T2->getAs<PointerType>();
440  if (T1PtrType && T2PtrType) {
441  T1 = T1PtrType->getPointeeType();
442  T2 = T2PtrType->getPointeeType();
443  return true;
444  }
445  const ObjCObjectPointerType *T1ObjCPtrType =
447  *T2ObjCPtrType =
449  if (T1ObjCPtrType) {
450  if (T2ObjCPtrType) {
451  T1 = T1ObjCPtrType->getPointeeType();
452  T2 = T2ObjCPtrType->getPointeeType();
453  return true;
454  }
455  else if (T2PtrType) {
456  T1 = T1ObjCPtrType->getPointeeType();
457  T2 = T2PtrType->getPointeeType();
458  return true;
459  }
460  }
461  else if (T2ObjCPtrType) {
462  if (T1PtrType) {
463  T2 = T2ObjCPtrType->getPointeeType();
464  T1 = T1PtrType->getPointeeType();
465  return true;
466  }
467  }
468 
469  const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
470  *T2MPType = T2->getAs<MemberPointerType>();
471  if (T1MPType && T2MPType) {
472  T1 = T1MPType->getPointeeType();
473  T2 = T2MPType->getPointeeType();
474  return true;
475  }
476 
477  const BlockPointerType *T1BPType = T1->getAs<BlockPointerType>(),
478  *T2BPType = T2->getAs<BlockPointerType>();
479  if (T1BPType && T2BPType) {
480  T1 = T1BPType->getPointeeType();
481  T2 = T2BPType->getPointeeType();
482  return true;
483  }
484 
485  const LValueReferenceType *T1RefType = T1->getAs<LValueReferenceType>(),
486  *T2RefType = T2->getAs<LValueReferenceType>();
487  if (T1RefType && T2RefType) {
488  T1 = T1RefType->getPointeeType();
489  T2 = T2RefType->getPointeeType();
490  return true;
491  }
492 
493  if (T1RefType) {
494  T1 = T1RefType->getPointeeType();
495  // T2 = T2;
496  return true;
497  }
498 
499  if (T2RefType) {
500  // T1 = T1;
501  T2 = T2RefType->getPointeeType();
502  return true;
503  }
504 
505  return false;
506 }
507 
508 /// CastsAwayConstness - Check if the pointer conversion from SrcType to
509 /// DestType casts away constness as defined in C++ 5.2.11p8ff. This is used by
510 /// the cast checkers. Both arguments must denote pointer (possibly to member)
511 /// types.
512 ///
513 /// \param CheckCVR Whether to check for const/volatile/restrict qualifiers.
514 ///
515 /// \param CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.
516 static bool
517 CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType,
518  bool CheckCVR, bool CheckObjCLifetime,
519  QualType *TheOffendingSrcType = nullptr,
520  QualType *TheOffendingDestType = nullptr,
521  Qualifiers *CastAwayQualifiers = nullptr) {
522  // If the only checking we care about is for Objective-C lifetime qualifiers,
523  // and we're not in ObjC mode, there's nothing to check.
524  if (!CheckCVR && CheckObjCLifetime &&
525  !Self.Context.getLangOpts().ObjC1)
526  return false;
527 
528  // Casting away constness is defined in C++ 5.2.11p8 with reference to
529  // C++ 4.4. We piggyback on Sema::IsQualificationConversion for this, since
530  // the rules are non-trivial. So first we construct Tcv *...cv* as described
531  // in C++ 5.2.11p8.
532  assert((SrcType->isAnyPointerType() || SrcType->isMemberPointerType() ||
533  SrcType->isBlockPointerType() ||
534  DestType->isLValueReferenceType()) &&
535  "Source type is not pointer or pointer to member.");
536  assert((DestType->isAnyPointerType() || DestType->isMemberPointerType() ||
537  DestType->isBlockPointerType() ||
538  DestType->isLValueReferenceType()) &&
539  "Destination type is not pointer or pointer to member, or reference.");
540 
541  QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
542  UnwrappedDestType = Self.Context.getCanonicalType(DestType);
544 
545  // Find the qualifiers. We only care about cvr-qualifiers for the
546  // purpose of this check, because other qualifiers (address spaces,
547  // Objective-C GC, etc.) are part of the type's identity.
548  QualType PrevUnwrappedSrcType = UnwrappedSrcType;
549  QualType PrevUnwrappedDestType = UnwrappedDestType;
550  while (UnwrapDissimilarPointerTypes(UnwrappedSrcType, UnwrappedDestType)) {
551  // Determine the relevant qualifiers at this level.
552  Qualifiers SrcQuals, DestQuals;
553  Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
554  Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
555 
556  // We do not meaningfully track object const-ness of Objective-C object
557  // types. Remove const from the source type if either the source or
558  // the destination is an Objective-C object type.
559  if (UnwrappedSrcType->isObjCObjectType() ||
560  UnwrappedDestType->isObjCObjectType())
561  SrcQuals.removeConst();
562 
563  Qualifiers RetainedSrcQuals, RetainedDestQuals;
564  if (CheckCVR) {
565  RetainedSrcQuals.setCVRQualifiers(SrcQuals.getCVRQualifiers());
566  RetainedDestQuals.setCVRQualifiers(DestQuals.getCVRQualifiers());
567 
568  if (RetainedSrcQuals != RetainedDestQuals && TheOffendingSrcType &&
569  TheOffendingDestType && CastAwayQualifiers) {
570  *TheOffendingSrcType = PrevUnwrappedSrcType;
571  *TheOffendingDestType = PrevUnwrappedDestType;
572  *CastAwayQualifiers = RetainedSrcQuals - RetainedDestQuals;
573  }
574  }
575 
576  if (CheckObjCLifetime &&
577  !DestQuals.compatiblyIncludesObjCLifetime(SrcQuals))
578  return true;
579 
580  cv1.push_back(RetainedSrcQuals);
581  cv2.push_back(RetainedDestQuals);
582 
583  PrevUnwrappedSrcType = UnwrappedSrcType;
584  PrevUnwrappedDestType = UnwrappedDestType;
585  }
586  if (cv1.empty())
587  return false;
588 
589  // Construct void pointers with those qualifiers (in reverse order of
590  // unwrapping, of course).
591  QualType SrcConstruct = Self.Context.VoidTy;
592  QualType DestConstruct = Self.Context.VoidTy;
593  ASTContext &Context = Self.Context;
594  for (SmallVectorImpl<Qualifiers>::reverse_iterator i1 = cv1.rbegin(),
595  i2 = cv2.rbegin();
596  i1 != cv1.rend(); ++i1, ++i2) {
597  SrcConstruct
598  = Context.getPointerType(Context.getQualifiedType(SrcConstruct, *i1));
599  DestConstruct
600  = Context.getPointerType(Context.getQualifiedType(DestConstruct, *i2));
601  }
602 
603  // Test if they're compatible.
604  bool ObjCLifetimeConversion;
605  return SrcConstruct != DestConstruct &&
606  !Self.IsQualificationConversion(SrcConstruct, DestConstruct, false,
607  ObjCLifetimeConversion);
608 }
609 
610 /// CheckDynamicCast - Check that a dynamic_cast<DestType>(SrcExpr) is valid.
611 /// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
612 /// checked downcasts in class hierarchies.
613 void CastOperation::CheckDynamicCast() {
614  if (ValueKind == VK_RValue)
615  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
616  else if (isPlaceholder())
617  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
618  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
619  return;
620 
621  QualType OrigSrcType = SrcExpr.get()->getType();
622  QualType DestType = Self.Context.getCanonicalType(this->DestType);
623 
624  // C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
625  // or "pointer to cv void".
626 
627  QualType DestPointee;
628  const PointerType *DestPointer = DestType->getAs<PointerType>();
629  const ReferenceType *DestReference = nullptr;
630  if (DestPointer) {
631  DestPointee = DestPointer->getPointeeType();
632  } else if ((DestReference = DestType->getAs<ReferenceType>())) {
633  DestPointee = DestReference->getPointeeType();
634  } else {
635  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
636  << this->DestType << DestRange;
637  SrcExpr = ExprError();
638  return;
639  }
640 
641  const RecordType *DestRecord = DestPointee->getAs<RecordType>();
642  if (DestPointee->isVoidType()) {
643  assert(DestPointer && "Reference to void is not possible");
644  } else if (DestRecord) {
645  if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
646  diag::err_bad_dynamic_cast_incomplete,
647  DestRange)) {
648  SrcExpr = ExprError();
649  return;
650  }
651  } else {
652  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
653  << DestPointee.getUnqualifiedType() << DestRange;
654  SrcExpr = ExprError();
655  return;
656  }
657 
658  // C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
659  // complete class type, [...]. If T is an lvalue reference type, v shall be
660  // an lvalue of a complete class type, [...]. If T is an rvalue reference
661  // type, v shall be an expression having a complete class type, [...]
662  QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
663  QualType SrcPointee;
664  if (DestPointer) {
665  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
666  SrcPointee = SrcPointer->getPointeeType();
667  } else {
668  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
669  << OrigSrcType << SrcExpr.get()->getSourceRange();
670  SrcExpr = ExprError();
671  return;
672  }
673  } else if (DestReference->isLValueReferenceType()) {
674  if (!SrcExpr.get()->isLValue()) {
675  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
676  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
677  }
678  SrcPointee = SrcType;
679  } else {
680  // If we're dynamic_casting from a prvalue to an rvalue reference, we need
681  // to materialize the prvalue before we bind the reference to it.
682  if (SrcExpr.get()->isRValue())
683  SrcExpr = Self.CreateMaterializeTemporaryExpr(
684  SrcType, SrcExpr.get(), /*IsLValueReference*/ false);
685  SrcPointee = SrcType;
686  }
687 
688  const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
689  if (SrcRecord) {
690  if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
691  diag::err_bad_dynamic_cast_incomplete,
692  SrcExpr.get())) {
693  SrcExpr = ExprError();
694  return;
695  }
696  } else {
697  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
698  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
699  SrcExpr = ExprError();
700  return;
701  }
702 
703  assert((DestPointer || DestReference) &&
704  "Bad destination non-ptr/ref slipped through.");
705  assert((DestRecord || DestPointee->isVoidType()) &&
706  "Bad destination pointee slipped through.");
707  assert(SrcRecord && "Bad source pointee slipped through.");
708 
709  // C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
710  if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
711  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_qualifiers_away)
712  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
713  SrcExpr = ExprError();
714  return;
715  }
716 
717  // C++ 5.2.7p3: If the type of v is the same as the required result type,
718  // [except for cv].
719  if (DestRecord == SrcRecord) {
720  Kind = CK_NoOp;
721  return;
722  }
723 
724  // C++ 5.2.7p5
725  // Upcasts are resolved statically.
726  if (DestRecord &&
727  Self.IsDerivedFrom(OpRange.getBegin(), SrcPointee, DestPointee)) {
728  if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
729  OpRange.getBegin(), OpRange,
730  &BasePath)) {
731  SrcExpr = ExprError();
732  return;
733  }
734 
735  Kind = CK_DerivedToBase;
736  return;
737  }
738 
739  // C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
740  const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
741  assert(SrcDecl && "Definition missing");
742  if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
743  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
744  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
745  SrcExpr = ExprError();
746  }
747 
748  // dynamic_cast is not available with -fno-rtti.
749  // As an exception, dynamic_cast to void* is available because it doesn't
750  // use RTTI.
751  if (!Self.getLangOpts().RTTI && !DestPointee->isVoidType()) {
752  Self.Diag(OpRange.getBegin(), diag::err_no_dynamic_cast_with_fno_rtti);
753  SrcExpr = ExprError();
754  return;
755  }
756 
757  // Done. Everything else is run-time checks.
758  Kind = CK_Dynamic;
759 }
760 
761 /// CheckConstCast - Check that a const_cast<DestType>(SrcExpr) is valid.
762 /// Refer to C++ 5.2.11 for details. const_cast is typically used in code
763 /// like this:
764 /// const char *str = "literal";
765 /// legacy_function(const_cast<char*>(str));
766 void CastOperation::CheckConstCast() {
767  if (ValueKind == VK_RValue)
768  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
769  else if (isPlaceholder())
770  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
771  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
772  return;
773 
774  unsigned msg = diag::err_bad_cxx_cast_generic;
775  if (TryConstCast(Self, SrcExpr, DestType, /*CStyle*/false, msg) != TC_Success
776  && msg != 0) {
777  Self.Diag(OpRange.getBegin(), msg) << CT_Const
778  << SrcExpr.get()->getType() << DestType << OpRange;
779  SrcExpr = ExprError();
780  }
781 }
782 
783 /// Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast
784 /// or downcast between respective pointers or references.
785 static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr,
786  QualType DestType,
787  SourceRange OpRange) {
788  QualType SrcType = SrcExpr->getType();
789  // When casting from pointer or reference, get pointee type; use original
790  // type otherwise.
791  const CXXRecordDecl *SrcPointeeRD = SrcType->getPointeeCXXRecordDecl();
792  const CXXRecordDecl *SrcRD =
793  SrcPointeeRD ? SrcPointeeRD : SrcType->getAsCXXRecordDecl();
794 
795  // Examining subobjects for records is only possible if the complete and
796  // valid definition is available. Also, template instantiation is not
797  // allowed here.
798  if (!SrcRD || !SrcRD->isCompleteDefinition() || SrcRD->isInvalidDecl())
799  return;
800 
801  const CXXRecordDecl *DestRD = DestType->getPointeeCXXRecordDecl();
802 
803  if (!DestRD || !DestRD->isCompleteDefinition() || DestRD->isInvalidDecl())
804  return;
805 
806  enum {
807  ReinterpretUpcast,
808  ReinterpretDowncast
809  } ReinterpretKind;
810 
811  CXXBasePaths BasePaths;
812 
813  if (SrcRD->isDerivedFrom(DestRD, BasePaths))
814  ReinterpretKind = ReinterpretUpcast;
815  else if (DestRD->isDerivedFrom(SrcRD, BasePaths))
816  ReinterpretKind = ReinterpretDowncast;
817  else
818  return;
819 
820  bool VirtualBase = true;
821  bool NonZeroOffset = false;
822  for (CXXBasePaths::const_paths_iterator I = BasePaths.begin(),
823  E = BasePaths.end();
824  I != E; ++I) {
825  const CXXBasePath &Path = *I;
827  bool IsVirtual = false;
828  for (CXXBasePath::const_iterator IElem = Path.begin(), EElem = Path.end();
829  IElem != EElem; ++IElem) {
830  IsVirtual = IElem->Base->isVirtual();
831  if (IsVirtual)
832  break;
833  const CXXRecordDecl *BaseRD = IElem->Base->getType()->getAsCXXRecordDecl();
834  assert(BaseRD && "Base type should be a valid unqualified class type");
835  // Don't check if any base has invalid declaration or has no definition
836  // since it has no layout info.
837  const CXXRecordDecl *Class = IElem->Class,
838  *ClassDefinition = Class->getDefinition();
839  if (Class->isInvalidDecl() || !ClassDefinition ||
840  !ClassDefinition->isCompleteDefinition())
841  return;
842 
843  const ASTRecordLayout &DerivedLayout =
844  Self.Context.getASTRecordLayout(Class);
845  Offset += DerivedLayout.getBaseClassOffset(BaseRD);
846  }
847  if (!IsVirtual) {
848  // Don't warn if any path is a non-virtually derived base at offset zero.
849  if (Offset.isZero())
850  return;
851  // Offset makes sense only for non-virtual bases.
852  else
853  NonZeroOffset = true;
854  }
855  VirtualBase = VirtualBase && IsVirtual;
856  }
857 
858  (void) NonZeroOffset; // Silence set but not used warning.
859  assert((VirtualBase || NonZeroOffset) &&
860  "Should have returned if has non-virtual base with zero offset");
861 
862  QualType BaseType =
863  ReinterpretKind == ReinterpretUpcast? DestType : SrcType;
864  QualType DerivedType =
865  ReinterpretKind == ReinterpretUpcast? SrcType : DestType;
866 
867  SourceLocation BeginLoc = OpRange.getBegin();
868  Self.Diag(BeginLoc, diag::warn_reinterpret_different_from_static)
869  << DerivedType << BaseType << !VirtualBase << int(ReinterpretKind)
870  << OpRange;
871  Self.Diag(BeginLoc, diag::note_reinterpret_updowncast_use_static)
872  << int(ReinterpretKind)
873  << FixItHint::CreateReplacement(BeginLoc, "static_cast");
874 }
875 
876 /// CheckReinterpretCast - Check that a reinterpret_cast<DestType>(SrcExpr) is
877 /// valid.
878 /// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
879 /// like this:
880 /// char *bytes = reinterpret_cast<char*>(int_ptr);
881 void CastOperation::CheckReinterpretCast() {
882  if (ValueKind == VK_RValue && !isPlaceholder(BuiltinType::Overload))
883  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
884  else
885  checkNonOverloadPlaceholders();
886  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
887  return;
888 
889  unsigned msg = diag::err_bad_cxx_cast_generic;
890  TryCastResult tcr =
891  TryReinterpretCast(Self, SrcExpr, DestType,
892  /*CStyle*/false, OpRange, msg, Kind);
893  if (tcr != TC_Success && msg != 0)
894  {
895  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
896  return;
897  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
898  //FIXME: &f<int>; is overloaded and resolvable
899  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
900  << OverloadExpr::find(SrcExpr.get()).Expression->getName()
901  << DestType << OpRange;
902  Self.NoteAllOverloadCandidates(SrcExpr.get());
903 
904  } else {
905  diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr.get(),
906  DestType, /*listInitialization=*/false);
907  }
908  SrcExpr = ExprError();
909  } else if (tcr == TC_Success) {
911  checkObjCConversion(Sema::CCK_OtherCast);
912  DiagnoseReinterpretUpDownCast(Self, SrcExpr.get(), DestType, OpRange);
913  }
914 }
915 
916 
917 /// CheckStaticCast - Check that a static_cast<DestType>(SrcExpr) is valid.
918 /// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
919 /// implicit conversions explicit and getting rid of data loss warnings.
920 void CastOperation::CheckStaticCast() {
921  if (isPlaceholder()) {
922  checkNonOverloadPlaceholders();
923  if (SrcExpr.isInvalid())
924  return;
925  }
926 
927  // This test is outside everything else because it's the only case where
928  // a non-lvalue-reference target type does not lead to decay.
929  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
930  if (DestType->isVoidType()) {
931  Kind = CK_ToVoid;
932 
933  if (claimPlaceholder(BuiltinType::Overload)) {
935  false, // Decay Function to ptr
936  true, // Complain
937  OpRange, DestType, diag::err_bad_static_cast_overload);
938  if (SrcExpr.isInvalid())
939  return;
940  }
941 
942  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
943  return;
944  }
945 
946  if (ValueKind == VK_RValue && !DestType->isRecordType() &&
947  !isPlaceholder(BuiltinType::Overload)) {
948  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
949  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
950  return;
951  }
952 
953  unsigned msg = diag::err_bad_cxx_cast_generic;
954  TryCastResult tcr
955  = TryStaticCast(Self, SrcExpr, DestType, Sema::CCK_OtherCast, OpRange, msg,
956  Kind, BasePath, /*ListInitialization=*/false);
957  if (tcr != TC_Success && msg != 0) {
958  if (SrcExpr.isInvalid())
959  return;
960  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
961  OverloadExpr* oe = OverloadExpr::find(SrcExpr.get()).Expression;
962  Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
963  << oe->getName() << DestType << OpRange
964  << oe->getQualifierLoc().getSourceRange();
965  Self.NoteAllOverloadCandidates(SrcExpr.get());
966  } else {
967  diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr.get(), DestType,
968  /*listInitialization=*/false);
969  }
970  SrcExpr = ExprError();
971  } else if (tcr == TC_Success) {
972  if (Kind == CK_BitCast)
973  checkCastAlign();
975  checkObjCConversion(Sema::CCK_OtherCast);
976  } else if (Kind == CK_BitCast) {
977  checkCastAlign();
978  }
979 }
980 
981 /// TryStaticCast - Check if a static cast can be performed, and do so if
982 /// possible. If @p CStyle, ignore access restrictions on hierarchy casting
983 /// and casting away constness.
985  QualType DestType,
987  SourceRange OpRange, unsigned &msg,
988  CastKind &Kind, CXXCastPath &BasePath,
989  bool ListInitialization) {
990  // Determine whether we have the semantics of a C-style cast.
991  bool CStyle
992  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
993 
994  // The order the tests is not entirely arbitrary. There is one conversion
995  // that can be handled in two different ways. Given:
996  // struct A {};
997  // struct B : public A {
998  // B(); B(const A&);
999  // };
1000  // const A &a = B();
1001  // the cast static_cast<const B&>(a) could be seen as either a static
1002  // reference downcast, or an explicit invocation of the user-defined
1003  // conversion using B's conversion constructor.
1004  // DR 427 specifies that the downcast is to be applied here.
1005 
1006  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1007  // Done outside this function.
1008 
1009  TryCastResult tcr;
1010 
1011  // C++ 5.2.9p5, reference downcast.
1012  // See the function for details.
1013  // DR 427 specifies that this is to be applied before paragraph 2.
1014  tcr = TryStaticReferenceDowncast(Self, SrcExpr.get(), DestType, CStyle,
1015  OpRange, msg, Kind, BasePath);
1016  if (tcr != TC_NotApplicable)
1017  return tcr;
1018 
1019  // C++11 [expr.static.cast]p3:
1020  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
1021  // T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1022  tcr = TryLValueToRValueCast(Self, SrcExpr.get(), DestType, CStyle, Kind,
1023  BasePath, msg);
1024  if (tcr != TC_NotApplicable)
1025  return tcr;
1026 
1027  // C++ 5.2.9p2: An expression e can be explicitly converted to a type T
1028  // [...] if the declaration "T t(e);" is well-formed, [...].
1029  tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CCK, OpRange, msg,
1030  Kind, ListInitialization);
1031  if (SrcExpr.isInvalid())
1032  return TC_Failed;
1033  if (tcr != TC_NotApplicable)
1034  return tcr;
1035 
1036  // C++ 5.2.9p6: May apply the reverse of any standard conversion, except
1037  // lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
1038  // conversions, subject to further restrictions.
1039  // Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
1040  // of qualification conversions impossible.
1041  // In the CStyle case, the earlier attempt to const_cast should have taken
1042  // care of reverse qualification conversions.
1043 
1044  QualType SrcType = Self.Context.getCanonicalType(SrcExpr.get()->getType());
1045 
1046  // C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
1047  // converted to an integral type. [...] A value of a scoped enumeration type
1048  // can also be explicitly converted to a floating-point type [...].
1049  if (const EnumType *Enum = SrcType->getAs<EnumType>()) {
1050  if (Enum->getDecl()->isScoped()) {
1051  if (DestType->isBooleanType()) {
1052  Kind = CK_IntegralToBoolean;
1053  return TC_Success;
1054  } else if (DestType->isIntegralType(Self.Context)) {
1055  Kind = CK_IntegralCast;
1056  return TC_Success;
1057  } else if (DestType->isRealFloatingType()) {
1058  Kind = CK_IntegralToFloating;
1059  return TC_Success;
1060  }
1061  }
1062  }
1063 
1064  // Reverse integral promotion/conversion. All such conversions are themselves
1065  // again integral promotions or conversions and are thus already handled by
1066  // p2 (TryDirectInitialization above).
1067  // (Note: any data loss warnings should be suppressed.)
1068  // The exception is the reverse of enum->integer, i.e. integer->enum (and
1069  // enum->enum). See also C++ 5.2.9p7.
1070  // The same goes for reverse floating point promotion/conversion and
1071  // floating-integral conversions. Again, only floating->enum is relevant.
1072  if (DestType->isEnumeralType()) {
1073  if (SrcType->isIntegralOrEnumerationType()) {
1074  Kind = CK_IntegralCast;
1075  return TC_Success;
1076  } else if (SrcType->isRealFloatingType()) {
1077  Kind = CK_FloatingToIntegral;
1078  return TC_Success;
1079  }
1080  }
1081 
1082  // Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
1083  // C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
1084  tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
1085  Kind, BasePath);
1086  if (tcr != TC_NotApplicable)
1087  return tcr;
1088 
1089  // Reverse member pointer conversion. C++ 4.11 specifies member pointer
1090  // conversion. C++ 5.2.9p9 has additional information.
1091  // DR54's access restrictions apply here also.
1092  tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
1093  OpRange, msg, Kind, BasePath);
1094  if (tcr != TC_NotApplicable)
1095  return tcr;
1096 
1097  // Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
1098  // void*. C++ 5.2.9p10 specifies additional restrictions, which really is
1099  // just the usual constness stuff.
1100  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
1101  QualType SrcPointee = SrcPointer->getPointeeType();
1102  if (SrcPointee->isVoidType()) {
1103  if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
1104  QualType DestPointee = DestPointer->getPointeeType();
1105  if (DestPointee->isIncompleteOrObjectType()) {
1106  // This is definitely the intended conversion, but it might fail due
1107  // to a qualifier violation. Note that we permit Objective-C lifetime
1108  // and GC qualifier mismatches here.
1109  if (!CStyle) {
1110  Qualifiers DestPointeeQuals = DestPointee.getQualifiers();
1111  Qualifiers SrcPointeeQuals = SrcPointee.getQualifiers();
1112  DestPointeeQuals.removeObjCGCAttr();
1113  DestPointeeQuals.removeObjCLifetime();
1114  SrcPointeeQuals.removeObjCGCAttr();
1115  SrcPointeeQuals.removeObjCLifetime();
1116  if (DestPointeeQuals != SrcPointeeQuals &&
1117  !DestPointeeQuals.compatiblyIncludes(SrcPointeeQuals)) {
1118  msg = diag::err_bad_cxx_cast_qualifiers_away;
1119  return TC_Failed;
1120  }
1121  }
1122  Kind = CK_BitCast;
1123  return TC_Success;
1124  }
1125 
1126  // Microsoft permits static_cast from 'pointer-to-void' to
1127  // 'pointer-to-function'.
1128  if (!CStyle && Self.getLangOpts().MSVCCompat &&
1129  DestPointee->isFunctionType()) {
1130  Self.Diag(OpRange.getBegin(), diag::ext_ms_cast_fn_obj) << OpRange;
1131  Kind = CK_BitCast;
1132  return TC_Success;
1133  }
1134  }
1135  else if (DestType->isObjCObjectPointerType()) {
1136  // allow both c-style cast and static_cast of objective-c pointers as
1137  // they are pervasive.
1138  Kind = CK_CPointerToObjCPointerCast;
1139  return TC_Success;
1140  }
1141  else if (CStyle && DestType->isBlockPointerType()) {
1142  // allow c-style cast of void * to block pointers.
1143  Kind = CK_AnyPointerToBlockPointerCast;
1144  return TC_Success;
1145  }
1146  }
1147  }
1148  // Allow arbitray objective-c pointer conversion with static casts.
1149  if (SrcType->isObjCObjectPointerType() &&
1150  DestType->isObjCObjectPointerType()) {
1151  Kind = CK_BitCast;
1152  return TC_Success;
1153  }
1154  // Allow ns-pointer to cf-pointer conversion in either direction
1155  // with static casts.
1156  if (!CStyle &&
1157  Self.CheckTollFreeBridgeStaticCast(DestType, SrcExpr.get(), Kind))
1158  return TC_Success;
1159 
1160  // See if it looks like the user is trying to convert between
1161  // related record types, and select a better diagnostic if so.
1162  if (auto SrcPointer = SrcType->getAs<PointerType>())
1163  if (auto DestPointer = DestType->getAs<PointerType>())
1164  if (SrcPointer->getPointeeType()->getAs<RecordType>() &&
1165  DestPointer->getPointeeType()->getAs<RecordType>())
1166  msg = diag::err_bad_cxx_cast_unrelated_class;
1167 
1168  // We tried everything. Everything! Nothing works! :-(
1169  return TC_NotApplicable;
1170 }
1171 
1172 /// Tests whether a conversion according to N2844 is valid.
1174  QualType DestType, bool CStyle,
1175  CastKind &Kind, CXXCastPath &BasePath,
1176  unsigned &msg) {
1177  // C++11 [expr.static.cast]p3:
1178  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
1179  // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1180  const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
1181  if (!R)
1182  return TC_NotApplicable;
1183 
1184  if (!SrcExpr->isGLValue())
1185  return TC_NotApplicable;
1186 
1187  // Because we try the reference downcast before this function, from now on
1188  // this is the only cast possibility, so we issue an error if we fail now.
1189  // FIXME: Should allow casting away constness if CStyle.
1190  bool DerivedToBase;
1191  bool ObjCConversion;
1192  bool ObjCLifetimeConversion;
1193  QualType FromType = SrcExpr->getType();
1194  QualType ToType = R->getPointeeType();
1195  if (CStyle) {
1196  FromType = FromType.getUnqualifiedType();
1197  ToType = ToType.getUnqualifiedType();
1198  }
1199 
1201  SrcExpr->getLocStart(), ToType, FromType, DerivedToBase, ObjCConversion,
1202  ObjCLifetimeConversion);
1203  if (RefResult != Sema::Ref_Compatible) {
1204  if (CStyle || RefResult == Sema::Ref_Incompatible)
1205  return TC_NotApplicable;
1206  // Diagnose types which are reference-related but not compatible here since
1207  // we can provide better diagnostics. In these cases forwarding to
1208  // [expr.static.cast]p4 should never result in a well-formed cast.
1209  msg = SrcExpr->isLValue() ? diag::err_bad_lvalue_to_rvalue_cast
1210  : diag::err_bad_rvalue_to_rvalue_cast;
1211  return TC_Failed;
1212  }
1213 
1214  if (DerivedToBase) {
1215  Kind = CK_DerivedToBase;
1216  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1217  /*DetectVirtual=*/true);
1218  if (!Self.IsDerivedFrom(SrcExpr->getLocStart(), SrcExpr->getType(),
1219  R->getPointeeType(), Paths))
1220  return TC_NotApplicable;
1221 
1222  Self.BuildBasePathArray(Paths, BasePath);
1223  } else
1224  Kind = CK_NoOp;
1225 
1226  return TC_Success;
1227 }
1228 
1229 /// Tests whether a conversion according to C++ 5.2.9p5 is valid.
1231 TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
1232  bool CStyle, SourceRange OpRange,
1233  unsigned &msg, CastKind &Kind,
1234  CXXCastPath &BasePath) {
1235  // C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
1236  // cast to type "reference to cv2 D", where D is a class derived from B,
1237  // if a valid standard conversion from "pointer to D" to "pointer to B"
1238  // exists, cv2 >= cv1, and B is not a virtual base class of D.
1239  // In addition, DR54 clarifies that the base must be accessible in the
1240  // current context. Although the wording of DR54 only applies to the pointer
1241  // variant of this rule, the intent is clearly for it to apply to the this
1242  // conversion as well.
1243 
1244  const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
1245  if (!DestReference) {
1246  return TC_NotApplicable;
1247  }
1248  bool RValueRef = DestReference->isRValueReferenceType();
1249  if (!RValueRef && !SrcExpr->isLValue()) {
1250  // We know the left side is an lvalue reference, so we can suggest a reason.
1251  msg = diag::err_bad_cxx_cast_rvalue;
1252  return TC_NotApplicable;
1253  }
1254 
1255  QualType DestPointee = DestReference->getPointeeType();
1256 
1257  // FIXME: If the source is a prvalue, we should issue a warning (because the
1258  // cast always has undefined behavior), and for AST consistency, we should
1259  // materialize a temporary.
1260  return TryStaticDowncast(Self,
1261  Self.Context.getCanonicalType(SrcExpr->getType()),
1262  Self.Context.getCanonicalType(DestPointee), CStyle,
1263  OpRange, SrcExpr->getType(), DestType, msg, Kind,
1264  BasePath);
1265 }
1266 
1267 /// Tests whether a conversion according to C++ 5.2.9p8 is valid.
1270  bool CStyle, SourceRange OpRange,
1271  unsigned &msg, CastKind &Kind,
1272  CXXCastPath &BasePath) {
1273  // C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
1274  // type, can be converted to an rvalue of type "pointer to cv2 D", where D
1275  // is a class derived from B, if a valid standard conversion from "pointer
1276  // to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
1277  // class of D.
1278  // In addition, DR54 clarifies that the base must be accessible in the
1279  // current context.
1280 
1281  const PointerType *DestPointer = DestType->getAs<PointerType>();
1282  if (!DestPointer) {
1283  return TC_NotApplicable;
1284  }
1285 
1286  const PointerType *SrcPointer = SrcType->getAs<PointerType>();
1287  if (!SrcPointer) {
1288  msg = diag::err_bad_static_cast_pointer_nonpointer;
1289  return TC_NotApplicable;
1290  }
1291 
1292  return TryStaticDowncast(Self,
1293  Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
1294  Self.Context.getCanonicalType(DestPointer->getPointeeType()),
1295  CStyle, OpRange, SrcType, DestType, msg, Kind,
1296  BasePath);
1297 }
1298 
1299 /// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
1300 /// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
1301 /// DestType is possible and allowed.
1304  bool CStyle, SourceRange OpRange, QualType OrigSrcType,
1305  QualType OrigDestType, unsigned &msg,
1306  CastKind &Kind, CXXCastPath &BasePath) {
1307  // We can only work with complete types. But don't complain if it doesn't work
1308  if (!Self.isCompleteType(OpRange.getBegin(), SrcType) ||
1309  !Self.isCompleteType(OpRange.getBegin(), DestType))
1310  return TC_NotApplicable;
1311 
1312  // Downcast can only happen in class hierarchies, so we need classes.
1313  if (!DestType->getAs<RecordType>() || !SrcType->getAs<RecordType>()) {
1314  return TC_NotApplicable;
1315  }
1316 
1317  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1318  /*DetectVirtual=*/true);
1319  if (!Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths)) {
1320  return TC_NotApplicable;
1321  }
1322 
1323  // Target type does derive from source type. Now we're serious. If an error
1324  // appears now, it's not ignored.
1325  // This may not be entirely in line with the standard. Take for example:
1326  // struct A {};
1327  // struct B : virtual A {
1328  // B(A&);
1329  // };
1330  //
1331  // void f()
1332  // {
1333  // (void)static_cast<const B&>(*((A*)0));
1334  // }
1335  // As far as the standard is concerned, p5 does not apply (A is virtual), so
1336  // p2 should be used instead - "const B& t(*((A*)0));" is perfectly valid.
1337  // However, both GCC and Comeau reject this example, and accepting it would
1338  // mean more complex code if we're to preserve the nice error message.
1339  // FIXME: Being 100% compliant here would be nice to have.
1340 
1341  // Must preserve cv, as always, unless we're in C-style mode.
1342  if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
1343  msg = diag::err_bad_cxx_cast_qualifiers_away;
1344  return TC_Failed;
1345  }
1346 
1347  if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
1348  // This code is analoguous to that in CheckDerivedToBaseConversion, except
1349  // that it builds the paths in reverse order.
1350  // To sum up: record all paths to the base and build a nice string from
1351  // them. Use it to spice up the error message.
1352  if (!Paths.isRecordingPaths()) {
1353  Paths.clear();
1354  Paths.setRecordingPaths(true);
1355  Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths);
1356  }
1357  std::string PathDisplayStr;
1358  std::set<unsigned> DisplayedPaths;
1359  for (clang::CXXBasePath &Path : Paths) {
1360  if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
1361  // We haven't displayed a path to this particular base
1362  // class subobject yet.
1363  PathDisplayStr += "\n ";
1364  for (CXXBasePathElement &PE : llvm::reverse(Path))
1365  PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
1366  PathDisplayStr += QualType(DestType).getAsString();
1367  }
1368  }
1369 
1370  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
1371  << QualType(SrcType).getUnqualifiedType()
1372  << QualType(DestType).getUnqualifiedType()
1373  << PathDisplayStr << OpRange;
1374  msg = 0;
1375  return TC_Failed;
1376  }
1377 
1378  if (Paths.getDetectedVirtual() != nullptr) {
1379  QualType VirtualBase(Paths.getDetectedVirtual(), 0);
1380  Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
1381  << OrigSrcType << OrigDestType << VirtualBase << OpRange;
1382  msg = 0;
1383  return TC_Failed;
1384  }
1385 
1386  if (!CStyle) {
1387  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1388  SrcType, DestType,
1389  Paths.front(),
1390  diag::err_downcast_from_inaccessible_base)) {
1391  case Sema::AR_accessible:
1392  case Sema::AR_delayed: // be optimistic
1393  case Sema::AR_dependent: // be optimistic
1394  break;
1395 
1396  case Sema::AR_inaccessible:
1397  msg = 0;
1398  return TC_Failed;
1399  }
1400  }
1401 
1402  Self.BuildBasePathArray(Paths, BasePath);
1403  Kind = CK_BaseToDerived;
1404  return TC_Success;
1405 }
1406 
1407 /// TryStaticMemberPointerUpcast - Tests whether a conversion according to
1408 /// C++ 5.2.9p9 is valid:
1409 ///
1410 /// An rvalue of type "pointer to member of D of type cv1 T" can be
1411 /// converted to an rvalue of type "pointer to member of B of type cv2 T",
1412 /// where B is a base class of D [...].
1413 ///
1416  QualType DestType, bool CStyle,
1417  SourceRange OpRange,
1418  unsigned &msg, CastKind &Kind,
1419  CXXCastPath &BasePath) {
1420  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
1421  if (!DestMemPtr)
1422  return TC_NotApplicable;
1423 
1424  bool WasOverloadedFunction = false;
1425  DeclAccessPair FoundOverload;
1426  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1427  if (FunctionDecl *Fn
1428  = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(), DestType, false,
1429  FoundOverload)) {
1430  CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
1431  SrcType = Self.Context.getMemberPointerType(Fn->getType(),
1432  Self.Context.getTypeDeclType(M->getParent()).getTypePtr());
1433  WasOverloadedFunction = true;
1434  }
1435  }
1436 
1437  const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1438  if (!SrcMemPtr) {
1439  msg = diag::err_bad_static_cast_member_pointer_nonmp;
1440  return TC_NotApplicable;
1441  }
1442 
1443  // Lock down the inheritance model right now in MS ABI, whether or not the
1444  // pointee types are the same.
1445  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1446  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
1447  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
1448  }
1449 
1450  // T == T, modulo cv
1451  if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
1452  DestMemPtr->getPointeeType()))
1453  return TC_NotApplicable;
1454 
1455  // B base of D
1456  QualType SrcClass(SrcMemPtr->getClass(), 0);
1457  QualType DestClass(DestMemPtr->getClass(), 0);
1458  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1459  /*DetectVirtual=*/true);
1460  if (!Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths))
1461  return TC_NotApplicable;
1462 
1463  // B is a base of D. But is it an allowed base? If not, it's a hard error.
1464  if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
1465  Paths.clear();
1466  Paths.setRecordingPaths(true);
1467  bool StillOkay =
1468  Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths);
1469  assert(StillOkay);
1470  (void)StillOkay;
1471  std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
1472  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
1473  << 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
1474  msg = 0;
1475  return TC_Failed;
1476  }
1477 
1478  if (const RecordType *VBase = Paths.getDetectedVirtual()) {
1479  Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
1480  << SrcClass << DestClass << QualType(VBase, 0) << OpRange;
1481  msg = 0;
1482  return TC_Failed;
1483  }
1484 
1485  if (!CStyle) {
1486  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1487  DestClass, SrcClass,
1488  Paths.front(),
1489  diag::err_upcast_to_inaccessible_base)) {
1490  case Sema::AR_accessible:
1491  case Sema::AR_delayed:
1492  case Sema::AR_dependent:
1493  // Optimistically assume that the delayed and dependent cases
1494  // will work out.
1495  break;
1496 
1497  case Sema::AR_inaccessible:
1498  msg = 0;
1499  return TC_Failed;
1500  }
1501  }
1502 
1503  if (WasOverloadedFunction) {
1504  // Resolve the address of the overloaded function again, this time
1505  // allowing complaints if something goes wrong.
1506  FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
1507  DestType,
1508  true,
1509  FoundOverload);
1510  if (!Fn) {
1511  msg = 0;
1512  return TC_Failed;
1513  }
1514 
1515  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
1516  if (!SrcExpr.isUsable()) {
1517  msg = 0;
1518  return TC_Failed;
1519  }
1520  }
1521 
1522  Self.BuildBasePathArray(Paths, BasePath);
1523  Kind = CK_DerivedToBaseMemberPointer;
1524  return TC_Success;
1525 }
1526 
1527 /// TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2
1528 /// is valid:
1529 ///
1530 /// An expression e can be explicitly converted to a type T using a
1531 /// @c static_cast if the declaration "T t(e);" is well-formed [...].
1533 TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr, QualType DestType,
1535  SourceRange OpRange, unsigned &msg,
1536  CastKind &Kind, bool ListInitialization) {
1537  if (DestType->isRecordType()) {
1538  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1539  diag::err_bad_dynamic_cast_incomplete) ||
1540  Self.RequireNonAbstractType(OpRange.getBegin(), DestType,
1541  diag::err_allocation_of_abstract_type)) {
1542  msg = 0;
1543  return TC_Failed;
1544  }
1545  }
1546 
1548  InitializationKind InitKind
1549  = (CCK == Sema::CCK_CStyleCast)
1550  ? InitializationKind::CreateCStyleCast(OpRange.getBegin(), OpRange,
1551  ListInitialization)
1552  : (CCK == Sema::CCK_FunctionalCast)
1553  ? InitializationKind::CreateFunctionalCast(OpRange, ListInitialization)
1554  : InitializationKind::CreateCast(OpRange);
1555  Expr *SrcExprRaw = SrcExpr.get();
1556  // FIXME: Per DR242, we should check for an implicit conversion sequence
1557  // or for a constructor that could be invoked by direct-initialization
1558  // here, not for an initialization sequence.
1559  InitializationSequence InitSeq(Self, Entity, InitKind, SrcExprRaw);
1560 
1561  // At this point of CheckStaticCast, if the destination is a reference,
1562  // or the expression is an overload expression this has to work.
1563  // There is no other way that works.
1564  // On the other hand, if we're checking a C-style cast, we've still got
1565  // the reinterpret_cast way.
1566  bool CStyle
1567  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
1568  if (InitSeq.Failed() && (CStyle || !DestType->isReferenceType()))
1569  return TC_NotApplicable;
1570 
1571  ExprResult Result = InitSeq.Perform(Self, Entity, InitKind, SrcExprRaw);
1572  if (Result.isInvalid()) {
1573  msg = 0;
1574  return TC_Failed;
1575  }
1576 
1577  if (InitSeq.isConstructorInitialization())
1578  Kind = CK_ConstructorConversion;
1579  else
1580  Kind = CK_NoOp;
1581 
1582  SrcExpr = Result;
1583  return TC_Success;
1584 }
1585 
1586 /// TryConstCast - See if a const_cast from source to destination is allowed,
1587 /// and perform it if it is.
1589  QualType DestType, bool CStyle,
1590  unsigned &msg) {
1591  DestType = Self.Context.getCanonicalType(DestType);
1592  QualType SrcType = SrcExpr.get()->getType();
1593  bool NeedToMaterializeTemporary = false;
1594 
1595  if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
1596  // C++11 5.2.11p4:
1597  // if a pointer to T1 can be explicitly converted to the type "pointer to
1598  // T2" using a const_cast, then the following conversions can also be
1599  // made:
1600  // -- an lvalue of type T1 can be explicitly converted to an lvalue of
1601  // type T2 using the cast const_cast<T2&>;
1602  // -- a glvalue of type T1 can be explicitly converted to an xvalue of
1603  // type T2 using the cast const_cast<T2&&>; and
1604  // -- if T1 is a class type, a prvalue of type T1 can be explicitly
1605  // converted to an xvalue of type T2 using the cast const_cast<T2&&>.
1606 
1607  if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr.get()->isLValue()) {
1608  // Cannot const_cast non-lvalue to lvalue reference type. But if this
1609  // is C-style, static_cast might find a way, so we simply suggest a
1610  // message and tell the parent to keep searching.
1611  msg = diag::err_bad_cxx_cast_rvalue;
1612  return TC_NotApplicable;
1613  }
1614 
1615  if (isa<RValueReferenceType>(DestTypeTmp) && SrcExpr.get()->isRValue()) {
1616  if (!SrcType->isRecordType()) {
1617  // Cannot const_cast non-class prvalue to rvalue reference type. But if
1618  // this is C-style, static_cast can do this.
1619  msg = diag::err_bad_cxx_cast_rvalue;
1620  return TC_NotApplicable;
1621  }
1622 
1623  // Materialize the class prvalue so that the const_cast can bind a
1624  // reference to it.
1625  NeedToMaterializeTemporary = true;
1626  }
1627 
1628  // It's not completely clear under the standard whether we can
1629  // const_cast bit-field gl-values. Doing so would not be
1630  // intrinsically complicated, but for now, we say no for
1631  // consistency with other compilers and await the word of the
1632  // committee.
1633  if (SrcExpr.get()->refersToBitField()) {
1634  msg = diag::err_bad_cxx_cast_bitfield;
1635  return TC_NotApplicable;
1636  }
1637 
1638  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1639  SrcType = Self.Context.getPointerType(SrcType);
1640  }
1641 
1642  // C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
1643  // the rules for const_cast are the same as those used for pointers.
1644 
1645  if (!DestType->isPointerType() &&
1646  !DestType->isMemberPointerType() &&
1647  !DestType->isObjCObjectPointerType()) {
1648  // Cannot cast to non-pointer, non-reference type. Note that, if DestType
1649  // was a reference type, we converted it to a pointer above.
1650  // The status of rvalue references isn't entirely clear, but it looks like
1651  // conversion to them is simply invalid.
1652  // C++ 5.2.11p3: For two pointer types [...]
1653  if (!CStyle)
1654  msg = diag::err_bad_const_cast_dest;
1655  return TC_NotApplicable;
1656  }
1657  if (DestType->isFunctionPointerType() ||
1658  DestType->isMemberFunctionPointerType()) {
1659  // Cannot cast direct function pointers.
1660  // C++ 5.2.11p2: [...] where T is any object type or the void type [...]
1661  // T is the ultimate pointee of source and target type.
1662  if (!CStyle)
1663  msg = diag::err_bad_const_cast_dest;
1664  return TC_NotApplicable;
1665  }
1666  SrcType = Self.Context.getCanonicalType(SrcType);
1667 
1668  // Unwrap the pointers. Ignore qualifiers. Terminate early if the types are
1669  // completely equal.
1670  // C++ 5.2.11p3 describes the core semantics of const_cast. All cv specifiers
1671  // in multi-level pointers may change, but the level count must be the same,
1672  // as must be the final pointee type.
1673  while (SrcType != DestType &&
1674  Self.Context.UnwrapSimilarPointerTypes(SrcType, DestType)) {
1675  Qualifiers SrcQuals, DestQuals;
1676  SrcType = Self.Context.getUnqualifiedArrayType(SrcType, SrcQuals);
1677  DestType = Self.Context.getUnqualifiedArrayType(DestType, DestQuals);
1678 
1679  // const_cast is permitted to strip cvr-qualifiers, only. Make sure that
1680  // the other qualifiers (e.g., address spaces) are identical.
1681  SrcQuals.removeCVRQualifiers();
1682  DestQuals.removeCVRQualifiers();
1683  if (SrcQuals != DestQuals)
1684  return TC_NotApplicable;
1685  }
1686 
1687  // Since we're dealing in canonical types, the remainder must be the same.
1688  if (SrcType != DestType)
1689  return TC_NotApplicable;
1690 
1691  if (NeedToMaterializeTemporary)
1692  // This is a const_cast from a class prvalue to an rvalue reference type.
1693  // Materialize a temporary to store the result of the conversion.
1694  SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcExpr.get()->getType(),
1695  SrcExpr.get(),
1696  /*IsLValueReference*/ false);
1697 
1698  return TC_Success;
1699 }
1700 
1701 // Checks for undefined behavior in reinterpret_cast.
1702 // The cases that is checked for is:
1703 // *reinterpret_cast<T*>(&a)
1704 // reinterpret_cast<T&>(a)
1705 // where accessing 'a' as type 'T' will result in undefined behavior.
1707  bool IsDereference,
1708  SourceRange Range) {
1709  unsigned DiagID = IsDereference ?
1710  diag::warn_pointer_indirection_from_incompatible_type :
1711  diag::warn_undefined_reinterpret_cast;
1712 
1713  if (Diags.isIgnored(DiagID, Range.getBegin()))
1714  return;
1715 
1716  QualType SrcTy, DestTy;
1717  if (IsDereference) {
1718  if (!SrcType->getAs<PointerType>() || !DestType->getAs<PointerType>()) {
1719  return;
1720  }
1721  SrcTy = SrcType->getPointeeType();
1722  DestTy = DestType->getPointeeType();
1723  } else {
1724  if (!DestType->getAs<ReferenceType>()) {
1725  return;
1726  }
1727  SrcTy = SrcType;
1728  DestTy = DestType->getPointeeType();
1729  }
1730 
1731  // Cast is compatible if the types are the same.
1732  if (Context.hasSameUnqualifiedType(DestTy, SrcTy)) {
1733  return;
1734  }
1735  // or one of the types is a char or void type
1736  if (DestTy->isAnyCharacterType() || DestTy->isVoidType() ||
1737  SrcTy->isAnyCharacterType() || SrcTy->isVoidType()) {
1738  return;
1739  }
1740  // or one of the types is a tag type.
1741  if (SrcTy->getAs<TagType>() || DestTy->getAs<TagType>()) {
1742  return;
1743  }
1744 
1745  // FIXME: Scoped enums?
1746  if ((SrcTy->isUnsignedIntegerType() && DestTy->isSignedIntegerType()) ||
1747  (SrcTy->isSignedIntegerType() && DestTy->isUnsignedIntegerType())) {
1748  if (Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) {
1749  return;
1750  }
1751  }
1752 
1753  Diag(Range.getBegin(), DiagID) << SrcType << DestType << Range;
1754 }
1755 
1756 static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr,
1757  QualType DestType) {
1758  QualType SrcType = SrcExpr.get()->getType();
1759  if (Self.Context.hasSameType(SrcType, DestType))
1760  return;
1761  if (const PointerType *SrcPtrTy = SrcType->getAs<PointerType>())
1762  if (SrcPtrTy->isObjCSelType()) {
1763  QualType DT = DestType;
1764  if (isa<PointerType>(DestType))
1765  DT = DestType->getPointeeType();
1766  if (!DT.getUnqualifiedType()->isVoidType())
1767  Self.Diag(SrcExpr.get()->getExprLoc(),
1768  diag::warn_cast_pointer_from_sel)
1769  << SrcType << DestType << SrcExpr.get()->getSourceRange();
1770  }
1771 }
1772 
1773 /// Diagnose casts that change the calling convention of a pointer to a function
1774 /// defined in the current TU.
1775 static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr,
1776  QualType DstType, SourceRange OpRange) {
1777  // Check if this cast would change the calling convention of a function
1778  // pointer type.
1779  QualType SrcType = SrcExpr.get()->getType();
1780  if (Self.Context.hasSameType(SrcType, DstType) ||
1781  !SrcType->isFunctionPointerType() || !DstType->isFunctionPointerType())
1782  return;
1783  const auto *SrcFTy =
1784  SrcType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
1785  const auto *DstFTy =
1786  DstType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
1787  CallingConv SrcCC = SrcFTy->getCallConv();
1788  CallingConv DstCC = DstFTy->getCallConv();
1789  if (SrcCC == DstCC)
1790  return;
1791 
1792  // We have a calling convention cast. Check if the source is a pointer to a
1793  // known, specific function that has already been defined.
1794  Expr *Src = SrcExpr.get()->IgnoreParenImpCasts();
1795  if (auto *UO = dyn_cast<UnaryOperator>(Src))
1796  if (UO->getOpcode() == UO_AddrOf)
1797  Src = UO->getSubExpr()->IgnoreParenImpCasts();
1798  auto *DRE = dyn_cast<DeclRefExpr>(Src);
1799  if (!DRE)
1800  return;
1801  auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
1802  if (!FD)
1803  return;
1804 
1805  // Only warn if we are casting from the default convention to a non-default
1806  // convention. This can happen when the programmer forgot to apply the calling
1807  // convention to the function declaration and then inserted this cast to
1808  // satisfy the type system.
1810  FD->isVariadic(), FD->isCXXInstanceMember());
1811  if (DstCC == DefaultCC || SrcCC != DefaultCC)
1812  return;
1813 
1814  // Diagnose this cast, as it is probably bad.
1815  StringRef SrcCCName = FunctionType::getNameForCallConv(SrcCC);
1816  StringRef DstCCName = FunctionType::getNameForCallConv(DstCC);
1817  Self.Diag(OpRange.getBegin(), diag::warn_cast_calling_conv)
1818  << SrcCCName << DstCCName << OpRange;
1819 
1820  // The checks above are cheaper than checking if the diagnostic is enabled.
1821  // However, it's worth checking if the warning is enabled before we construct
1822  // a fixit.
1823  if (Self.Diags.isIgnored(diag::warn_cast_calling_conv, OpRange.getBegin()))
1824  return;
1825 
1826  // Try to suggest a fixit to change the calling convention of the function
1827  // whose address was taken. Try to use the latest macro for the convention.
1828  // For example, users probably want to write "WINAPI" instead of "__stdcall"
1829  // to match the Windows header declarations.
1830  SourceLocation NameLoc = FD->getFirstDecl()->getNameInfo().getLoc();
1831  Preprocessor &PP = Self.getPreprocessor();
1832  SmallVector<TokenValue, 6> AttrTokens;
1833  SmallString<64> CCAttrText;
1834  llvm::raw_svector_ostream OS(CCAttrText);
1835  if (Self.getLangOpts().MicrosoftExt) {
1836  // __stdcall or __vectorcall
1837  OS << "__" << DstCCName;
1838  IdentifierInfo *II = PP.getIdentifierInfo(OS.str());
1839  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
1840  ? TokenValue(II->getTokenID())
1841  : TokenValue(II));
1842  } else {
1843  // __attribute__((stdcall)) or __attribute__((vectorcall))
1844  OS << "__attribute__((" << DstCCName << "))";
1845  AttrTokens.push_back(tok::kw___attribute);
1846  AttrTokens.push_back(tok::l_paren);
1847  AttrTokens.push_back(tok::l_paren);
1848  IdentifierInfo *II = PP.getIdentifierInfo(DstCCName);
1849  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
1850  ? TokenValue(II->getTokenID())
1851  : TokenValue(II));
1852  AttrTokens.push_back(tok::r_paren);
1853  AttrTokens.push_back(tok::r_paren);
1854  }
1855  StringRef AttrSpelling = PP.getLastMacroWithSpelling(NameLoc, AttrTokens);
1856  if (!AttrSpelling.empty())
1857  CCAttrText = AttrSpelling;
1858  OS << ' ';
1859  Self.Diag(NameLoc, diag::note_change_calling_conv_fixit)
1860  << FD << DstCCName << FixItHint::CreateInsertion(NameLoc, CCAttrText);
1861 }
1862 
1863 static void checkIntToPointerCast(bool CStyle, SourceLocation Loc,
1864  const Expr *SrcExpr, QualType DestType,
1865  Sema &Self) {
1866  QualType SrcType = SrcExpr->getType();
1867 
1868  // Not warning on reinterpret_cast, boolean, constant expressions, etc
1869  // are not explicit design choices, but consistent with GCC's behavior.
1870  // Feel free to modify them if you've reason/evidence for an alternative.
1871  if (CStyle && SrcType->isIntegralType(Self.Context)
1872  && !SrcType->isBooleanType()
1873  && !SrcType->isEnumeralType()
1874  && !SrcExpr->isIntegerConstantExpr(Self.Context)
1875  && Self.Context.getTypeSize(DestType) >
1876  Self.Context.getTypeSize(SrcType)) {
1877  // Separate between casts to void* and non-void* pointers.
1878  // Some APIs use (abuse) void* for something like a user context,
1879  // and often that value is an integer even if it isn't a pointer itself.
1880  // Having a separate warning flag allows users to control the warning
1881  // for their workflow.
1882  unsigned Diag = DestType->isVoidPointerType() ?
1883  diag::warn_int_to_void_pointer_cast
1884  : diag::warn_int_to_pointer_cast;
1885  Self.Diag(Loc, Diag) << SrcType << DestType;
1886  }
1887 }
1888 
1889 static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType,
1890  ExprResult &Result) {
1891  // We can only fix an overloaded reinterpret_cast if
1892  // - it is a template with explicit arguments that resolves to an lvalue
1893  // unambiguously, or
1894  // - it is the only function in an overload set that may have its address
1895  // taken.
1896 
1897  Expr *E = Result.get();
1898  // TODO: what if this fails because of DiagnoseUseOfDecl or something
1899  // like it?
1901  Result,
1902  Expr::getValueKindForType(DestType) == VK_RValue // Convert Fun to Ptr
1903  ) &&
1904  Result.isUsable())
1905  return true;
1906 
1907  // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
1908  // preserves Result.
1909  Result = E;
1911  Result, /*DoFunctionPointerConversion=*/true))
1912  return false;
1913  return Result.isUsable();
1914 }
1915 
1917  QualType DestType, bool CStyle,
1918  SourceRange OpRange,
1919  unsigned &msg,
1920  CastKind &Kind) {
1921  bool IsLValueCast = false;
1922 
1923  DestType = Self.Context.getCanonicalType(DestType);
1924  QualType SrcType = SrcExpr.get()->getType();
1925 
1926  // Is the source an overloaded name? (i.e. &foo)
1927  // If so, reinterpret_cast generally can not help us here (13.4, p1, bullet 5)
1928  if (SrcType == Self.Context.OverloadTy) {
1929  ExprResult FixedExpr = SrcExpr;
1930  if (!fixOverloadedReinterpretCastExpr(Self, DestType, FixedExpr))
1931  return TC_NotApplicable;
1932 
1933  assert(FixedExpr.isUsable() && "Invalid result fixing overloaded expr");
1934  SrcExpr = FixedExpr;
1935  SrcType = SrcExpr.get()->getType();
1936  }
1937 
1938  if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
1939  if (!SrcExpr.get()->isGLValue()) {
1940  // Cannot cast non-glvalue to (lvalue or rvalue) reference type. See the
1941  // similar comment in const_cast.
1942  msg = diag::err_bad_cxx_cast_rvalue;
1943  return TC_NotApplicable;
1944  }
1945 
1946  if (!CStyle) {
1947  Self.CheckCompatibleReinterpretCast(SrcType, DestType,
1948  /*isDereference=*/false, OpRange);
1949  }
1950 
1951  // C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
1952  // same effect as the conversion *reinterpret_cast<T*>(&x) with the
1953  // built-in & and * operators.
1954 
1955  const char *inappropriate = nullptr;
1956  switch (SrcExpr.get()->getObjectKind()) {
1957  case OK_Ordinary:
1958  break;
1959  case OK_BitField:
1960  msg = diag::err_bad_cxx_cast_bitfield;
1961  return TC_NotApplicable;
1962  // FIXME: Use a specific diagnostic for the rest of these cases.
1963  case OK_VectorComponent: inappropriate = "vector element"; break;
1964  case OK_ObjCProperty: inappropriate = "property expression"; break;
1965  case OK_ObjCSubscript: inappropriate = "container subscripting expression";
1966  break;
1967  }
1968  if (inappropriate) {
1969  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_reference)
1970  << inappropriate << DestType
1971  << OpRange << SrcExpr.get()->getSourceRange();
1972  msg = 0; SrcExpr = ExprError();
1973  return TC_NotApplicable;
1974  }
1975 
1976  // This code does this transformation for the checked types.
1977  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1978  SrcType = Self.Context.getPointerType(SrcType);
1979 
1980  IsLValueCast = true;
1981  }
1982 
1983  // Canonicalize source for comparison.
1984  SrcType = Self.Context.getCanonicalType(SrcType);
1985 
1986  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
1987  *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1988  if (DestMemPtr && SrcMemPtr) {
1989  // C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
1990  // can be explicitly converted to an rvalue of type "pointer to member
1991  // of Y of type T2" if T1 and T2 are both function types or both object
1992  // types.
1993  if (DestMemPtr->isMemberFunctionPointer() !=
1994  SrcMemPtr->isMemberFunctionPointer())
1995  return TC_NotApplicable;
1996 
1997  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
1998  // constness.
1999  // A reinterpret_cast followed by a const_cast can, though, so in C-style,
2000  // we accept it.
2001  if (CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2002  /*CheckObjCLifetime=*/CStyle)) {
2003  msg = diag::err_bad_cxx_cast_qualifiers_away;
2004  return TC_Failed;
2005  }
2006 
2007  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2008  // We need to determine the inheritance model that the class will use if
2009  // haven't yet.
2010  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
2011  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
2012  }
2013 
2014  // Don't allow casting between member pointers of different sizes.
2015  if (Self.Context.getTypeSize(DestMemPtr) !=
2016  Self.Context.getTypeSize(SrcMemPtr)) {
2017  msg = diag::err_bad_cxx_cast_member_pointer_size;
2018  return TC_Failed;
2019  }
2020 
2021  // A valid member pointer cast.
2022  assert(!IsLValueCast);
2023  Kind = CK_ReinterpretMemberPointer;
2024  return TC_Success;
2025  }
2026 
2027  // See below for the enumeral issue.
2028  if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
2029  // C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
2030  // type large enough to hold it. A value of std::nullptr_t can be
2031  // converted to an integral type; the conversion has the same meaning
2032  // and validity as a conversion of (void*)0 to the integral type.
2033  if (Self.Context.getTypeSize(SrcType) >
2034  Self.Context.getTypeSize(DestType)) {
2035  msg = diag::err_bad_reinterpret_cast_small_int;
2036  return TC_Failed;
2037  }
2038  Kind = CK_PointerToIntegral;
2039  return TC_Success;
2040  }
2041 
2042  // Allow reinterpret_casts between vectors of the same size and
2043  // between vectors and integers of the same size.
2044  bool destIsVector = DestType->isVectorType();
2045  bool srcIsVector = SrcType->isVectorType();
2046  if (srcIsVector || destIsVector) {
2047  // The non-vector type, if any, must have integral type. This is
2048  // the same rule that C vector casts use; note, however, that enum
2049  // types are not integral in C++.
2050  if ((!destIsVector && !DestType->isIntegralType(Self.Context)) ||
2051  (!srcIsVector && !SrcType->isIntegralType(Self.Context)))
2052  return TC_NotApplicable;
2053 
2054  // The size we want to consider is eltCount * eltSize.
2055  // That's exactly what the lax-conversion rules will check.
2056  if (Self.areLaxCompatibleVectorTypes(SrcType, DestType)) {
2057  Kind = CK_BitCast;
2058  return TC_Success;
2059  }
2060 
2061  // Otherwise, pick a reasonable diagnostic.
2062  if (!destIsVector)
2063  msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
2064  else if (!srcIsVector)
2065  msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
2066  else
2067  msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
2068 
2069  return TC_Failed;
2070  }
2071 
2072  if (SrcType == DestType) {
2073  // C++ 5.2.10p2 has a note that mentions that, subject to all other
2074  // restrictions, a cast to the same type is allowed so long as it does not
2075  // cast away constness. In C++98, the intent was not entirely clear here,
2076  // since all other paragraphs explicitly forbid casts to the same type.
2077  // C++11 clarifies this case with p2.
2078  //
2079  // The only allowed types are: integral, enumeration, pointer, or
2080  // pointer-to-member types. We also won't restrict Obj-C pointers either.
2081  Kind = CK_NoOp;
2083  if (SrcType->isIntegralOrEnumerationType() ||
2084  SrcType->isAnyPointerType() ||
2085  SrcType->isMemberPointerType() ||
2086  SrcType->isBlockPointerType()) {
2087  Result = TC_Success;
2088  }
2089  return Result;
2090  }
2091 
2092  bool destIsPtr = DestType->isAnyPointerType() ||
2093  DestType->isBlockPointerType();
2094  bool srcIsPtr = SrcType->isAnyPointerType() ||
2095  SrcType->isBlockPointerType();
2096  if (!destIsPtr && !srcIsPtr) {
2097  // Except for std::nullptr_t->integer and lvalue->reference, which are
2098  // handled above, at least one of the two arguments must be a pointer.
2099  return TC_NotApplicable;
2100  }
2101 
2102  if (DestType->isIntegralType(Self.Context)) {
2103  assert(srcIsPtr && "One type must be a pointer");
2104  // C++ 5.2.10p4: A pointer can be explicitly converted to any integral
2105  // type large enough to hold it; except in Microsoft mode, where the
2106  // integral type size doesn't matter (except we don't allow bool).
2107  bool MicrosoftException = Self.getLangOpts().MicrosoftExt &&
2108  !DestType->isBooleanType();
2109  if ((Self.Context.getTypeSize(SrcType) >
2110  Self.Context.getTypeSize(DestType)) &&
2111  !MicrosoftException) {
2112  msg = diag::err_bad_reinterpret_cast_small_int;
2113  return TC_Failed;
2114  }
2115  Kind = CK_PointerToIntegral;
2116  return TC_Success;
2117  }
2118 
2119  if (SrcType->isIntegralOrEnumerationType()) {
2120  assert(destIsPtr && "One type must be a pointer");
2121  checkIntToPointerCast(CStyle, OpRange.getBegin(), SrcExpr.get(), DestType,
2122  Self);
2123  // C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
2124  // converted to a pointer.
2125  // C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
2126  // necessarily converted to a null pointer value.]
2127  Kind = CK_IntegralToPointer;
2128  return TC_Success;
2129  }
2130 
2131  if (!destIsPtr || !srcIsPtr) {
2132  // With the valid non-pointer conversions out of the way, we can be even
2133  // more stringent.
2134  return TC_NotApplicable;
2135  }
2136 
2137  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
2138  // The C-style cast operator can.
2139  if (CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2140  /*CheckObjCLifetime=*/CStyle)) {
2141  msg = diag::err_bad_cxx_cast_qualifiers_away;
2142  return TC_Failed;
2143  }
2144 
2145  // Cannot convert between block pointers and Objective-C object pointers.
2146  if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) ||
2147  (DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
2148  return TC_NotApplicable;
2149 
2150  if (IsLValueCast) {
2151  Kind = CK_LValueBitCast;
2152  } else if (DestType->isObjCObjectPointerType()) {
2153  Kind = Self.PrepareCastToObjCObjectPointer(SrcExpr);
2154  } else if (DestType->isBlockPointerType()) {
2155  if (!SrcType->isBlockPointerType()) {
2156  Kind = CK_AnyPointerToBlockPointerCast;
2157  } else {
2158  Kind = CK_BitCast;
2159  }
2160  } else {
2161  Kind = CK_BitCast;
2162  }
2163 
2164  // Any pointer can be cast to an Objective-C pointer type with a C-style
2165  // cast.
2166  if (CStyle && DestType->isObjCObjectPointerType()) {
2167  return TC_Success;
2168  }
2169  if (CStyle)
2170  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2171 
2172  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2173 
2174  // Not casting away constness, so the only remaining check is for compatible
2175  // pointer categories.
2176 
2177  if (SrcType->isFunctionPointerType()) {
2178  if (DestType->isFunctionPointerType()) {
2179  // C++ 5.2.10p6: A pointer to a function can be explicitly converted to
2180  // a pointer to a function of a different type.
2181  return TC_Success;
2182  }
2183 
2184  // C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
2185  // an object type or vice versa is conditionally-supported.
2186  // Compilers support it in C++03 too, though, because it's necessary for
2187  // casting the return value of dlsym() and GetProcAddress().
2188  // FIXME: Conditionally-supported behavior should be configurable in the
2189  // TargetInfo or similar.
2190  Self.Diag(OpRange.getBegin(),
2191  Self.getLangOpts().CPlusPlus11 ?
2192  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2193  << OpRange;
2194  return TC_Success;
2195  }
2196 
2197  if (DestType->isFunctionPointerType()) {
2198  // See above.
2199  Self.Diag(OpRange.getBegin(),
2200  Self.getLangOpts().CPlusPlus11 ?
2201  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2202  << OpRange;
2203  return TC_Success;
2204  }
2205 
2206  // C++ 5.2.10p7: A pointer to an object can be explicitly converted to
2207  // a pointer to an object of different type.
2208  // Void pointers are not specified, but supported by every compiler out there.
2209  // So we finish by allowing everything that remains - it's got to be two
2210  // object pointers.
2211  return TC_Success;
2212 }
2213 
2214 void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
2215  bool ListInitialization) {
2216  assert(Self.getLangOpts().CPlusPlus);
2217 
2218  // Handle placeholders.
2219  if (isPlaceholder()) {
2220  // C-style casts can resolve __unknown_any types.
2221  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2222  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2223  SrcExpr.get(), Kind,
2224  ValueKind, BasePath);
2225  return;
2226  }
2227 
2228  checkNonOverloadPlaceholders();
2229  if (SrcExpr.isInvalid())
2230  return;
2231  }
2232 
2233  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
2234  // This test is outside everything else because it's the only case where
2235  // a non-lvalue-reference target type does not lead to decay.
2236  if (DestType->isVoidType()) {
2237  Kind = CK_ToVoid;
2238 
2239  if (claimPlaceholder(BuiltinType::Overload)) {
2241  SrcExpr, /* Decay Function to ptr */ false,
2242  /* Complain */ true, DestRange, DestType,
2243  diag::err_bad_cstyle_cast_overload);
2244  if (SrcExpr.isInvalid())
2245  return;
2246  }
2247 
2248  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2249  return;
2250  }
2251 
2252  // If the type is dependent, we won't do any other semantic analysis now.
2253  if (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2254  SrcExpr.get()->isValueDependent()) {
2255  assert(Kind == CK_Dependent);
2256  return;
2257  }
2258 
2259  if (ValueKind == VK_RValue && !DestType->isRecordType() &&
2260  !isPlaceholder(BuiltinType::Overload)) {
2261  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2262  if (SrcExpr.isInvalid())
2263  return;
2264  }
2265 
2266  // AltiVec vector initialization with a single literal.
2267  if (const VectorType *vecTy = DestType->getAs<VectorType>())
2268  if (vecTy->getVectorKind() == VectorType::AltiVecVector
2269  && (SrcExpr.get()->getType()->isIntegerType()
2270  || SrcExpr.get()->getType()->isFloatingType())) {
2271  Kind = CK_VectorSplat;
2272  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2273  return;
2274  }
2275 
2276  // C++ [expr.cast]p5: The conversions performed by
2277  // - a const_cast,
2278  // - a static_cast,
2279  // - a static_cast followed by a const_cast,
2280  // - a reinterpret_cast, or
2281  // - a reinterpret_cast followed by a const_cast,
2282  // can be performed using the cast notation of explicit type conversion.
2283  // [...] If a conversion can be interpreted in more than one of the ways
2284  // listed above, the interpretation that appears first in the list is used,
2285  // even if a cast resulting from that interpretation is ill-formed.
2286  // In plain language, this means trying a const_cast ...
2287  unsigned msg = diag::err_bad_cxx_cast_generic;
2288  TryCastResult tcr = TryConstCast(Self, SrcExpr, DestType,
2289  /*CStyle*/true, msg);
2290  if (SrcExpr.isInvalid())
2291  return;
2292  if (tcr == TC_Success)
2293  Kind = CK_NoOp;
2294 
2296  = FunctionalStyle? Sema::CCK_FunctionalCast
2298  if (tcr == TC_NotApplicable) {
2299  // ... or if that is not possible, a static_cast, ignoring const, ...
2300  tcr = TryStaticCast(Self, SrcExpr, DestType, CCK, OpRange,
2301  msg, Kind, BasePath, ListInitialization);
2302  if (SrcExpr.isInvalid())
2303  return;
2304 
2305  if (tcr == TC_NotApplicable) {
2306  // ... and finally a reinterpret_cast, ignoring const.
2307  tcr = TryReinterpretCast(Self, SrcExpr, DestType, /*CStyle*/true,
2308  OpRange, msg, Kind);
2309  if (SrcExpr.isInvalid())
2310  return;
2311  }
2312  }
2313 
2315  tcr == TC_Success)
2316  checkObjCConversion(CCK);
2317 
2318  if (tcr != TC_Success && msg != 0) {
2319  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2320  DeclAccessPair Found;
2322  DestType,
2323  /*Complain*/ true,
2324  Found);
2325  if (Fn) {
2326  // If DestType is a function type (not to be confused with the function
2327  // pointer type), it will be possible to resolve the function address,
2328  // but the type cast should be considered as failure.
2329  OverloadExpr *OE = OverloadExpr::find(SrcExpr.get()).Expression;
2330  Self.Diag(OpRange.getBegin(), diag::err_bad_cstyle_cast_overload)
2331  << OE->getName() << DestType << OpRange
2332  << OE->getQualifierLoc().getSourceRange();
2333  Self.NoteAllOverloadCandidates(SrcExpr.get());
2334  }
2335  } else {
2336  diagnoseBadCast(Self, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
2337  OpRange, SrcExpr.get(), DestType, ListInitialization);
2338  }
2339  } else if (Kind == CK_BitCast) {
2340  checkCastAlign();
2341  }
2342 
2343  // Clear out SrcExpr if there was a fatal error.
2344  if (tcr != TC_Success)
2345  SrcExpr = ExprError();
2346 }
2347 
2348 /// DiagnoseBadFunctionCast - Warn whenever a function call is cast to a
2349 /// non-matching type. Such as enum function call to int, int call to
2350 /// pointer; etc. Cast to 'void' is an exception.
2351 static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr,
2352  QualType DestType) {
2353  if (Self.Diags.isIgnored(diag::warn_bad_function_cast,
2354  SrcExpr.get()->getExprLoc()))
2355  return;
2356 
2357  if (!isa<CallExpr>(SrcExpr.get()))
2358  return;
2359 
2360  QualType SrcType = SrcExpr.get()->getType();
2361  if (DestType.getUnqualifiedType()->isVoidType())
2362  return;
2363  if ((SrcType->isAnyPointerType() || SrcType->isBlockPointerType())
2364  && (DestType->isAnyPointerType() || DestType->isBlockPointerType()))
2365  return;
2366  if (SrcType->isIntegerType() && DestType->isIntegerType() &&
2367  (SrcType->isBooleanType() == DestType->isBooleanType()) &&
2368  (SrcType->isEnumeralType() == DestType->isEnumeralType()))
2369  return;
2370  if (SrcType->isRealFloatingType() && DestType->isRealFloatingType())
2371  return;
2372  if (SrcType->isEnumeralType() && DestType->isEnumeralType())
2373  return;
2374  if (SrcType->isComplexType() && DestType->isComplexType())
2375  return;
2376  if (SrcType->isComplexIntegerType() && DestType->isComplexIntegerType())
2377  return;
2378 
2379  Self.Diag(SrcExpr.get()->getExprLoc(),
2380  diag::warn_bad_function_cast)
2381  << SrcType << DestType << SrcExpr.get()->getSourceRange();
2382 }
2383 
2384 /// Check the semantics of a C-style cast operation, in C.
2385 void CastOperation::CheckCStyleCast() {
2386  assert(!Self.getLangOpts().CPlusPlus);
2387 
2388  // C-style casts can resolve __unknown_any types.
2389  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2390  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2391  SrcExpr.get(), Kind,
2392  ValueKind, BasePath);
2393  return;
2394  }
2395 
2396  // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2397  // type needs to be scalar.
2398  if (DestType->isVoidType()) {
2399  // We don't necessarily do lvalue-to-rvalue conversions on this.
2400  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2401  if (SrcExpr.isInvalid())
2402  return;
2403 
2404  // Cast to void allows any expr type.
2405  Kind = CK_ToVoid;
2406  return;
2407  }
2408 
2409  // Overloads are allowed with C extensions, so we need to support them.
2410  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2411  DeclAccessPair DAP;
2413  SrcExpr.get(), DestType, /*Complain=*/true, DAP))
2414  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr.get(), DAP, FD);
2415  else
2416  return;
2417  assert(SrcExpr.isUsable());
2418  }
2419  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2420  if (SrcExpr.isInvalid())
2421  return;
2422  QualType SrcType = SrcExpr.get()->getType();
2423 
2424  assert(!SrcType->isPlaceholderType());
2425 
2426  // OpenCL v1 s6.5: Casting a pointer to address space A to a pointer to
2427  // address space B is illegal.
2428  if (Self.getLangOpts().OpenCL && DestType->isPointerType() &&
2429  SrcType->isPointerType()) {
2430  const PointerType *DestPtr = DestType->getAs<PointerType>();
2431  if (!DestPtr->isAddressSpaceOverlapping(*SrcType->getAs<PointerType>())) {
2432  Self.Diag(OpRange.getBegin(),
2433  diag::err_typecheck_incompatible_address_space)
2434  << SrcType << DestType << Sema::AA_Casting
2435  << SrcExpr.get()->getSourceRange();
2436  SrcExpr = ExprError();
2437  return;
2438  }
2439  }
2440 
2441  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
2442  diag::err_typecheck_cast_to_incomplete)) {
2443  SrcExpr = ExprError();
2444  return;
2445  }
2446 
2447  if (!DestType->isScalarType() && !DestType->isVectorType()) {
2448  const RecordType *DestRecordTy = DestType->getAs<RecordType>();
2449 
2450  if (DestRecordTy && Self.Context.hasSameUnqualifiedType(DestType, SrcType)){
2451  // GCC struct/union extension: allow cast to self.
2452  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_nonscalar)
2453  << DestType << SrcExpr.get()->getSourceRange();
2454  Kind = CK_NoOp;
2455  return;
2456  }
2457 
2458  // GCC's cast to union extension.
2459  if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
2460  RecordDecl *RD = DestRecordTy->getDecl();
2461  if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
2462  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
2463  << SrcExpr.get()->getSourceRange();
2464  Kind = CK_ToUnion;
2465  return;
2466  } else {
2467  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
2468  << SrcType << SrcExpr.get()->getSourceRange();
2469  SrcExpr = ExprError();
2470  return;
2471  }
2472  }
2473 
2474  // OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.
2475  if (Self.getLangOpts().OpenCL && DestType->isEventT()) {
2476  llvm::APSInt CastInt;
2477  if (SrcExpr.get()->EvaluateAsInt(CastInt, Self.Context)) {
2478  if (0 == CastInt) {
2479  Kind = CK_ZeroToOCLEvent;
2480  return;
2481  }
2482  Self.Diag(OpRange.getBegin(),
2483  diag::err_opencl_cast_non_zero_to_event_t)
2484  << CastInt.toString(10) << SrcExpr.get()->getSourceRange();
2485  SrcExpr = ExprError();
2486  return;
2487  }
2488  }
2489 
2490  // Reject any other conversions to non-scalar types.
2491  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cond_expect_scalar)
2492  << DestType << SrcExpr.get()->getSourceRange();
2493  SrcExpr = ExprError();
2494  return;
2495  }
2496 
2497  // The type we're casting to is known to be a scalar or vector.
2498 
2499  // Require the operand to be a scalar or vector.
2500  if (!SrcType->isScalarType() && !SrcType->isVectorType()) {
2501  Self.Diag(SrcExpr.get()->getExprLoc(),
2502  diag::err_typecheck_expect_scalar_operand)
2503  << SrcType << SrcExpr.get()->getSourceRange();
2504  SrcExpr = ExprError();
2505  return;
2506  }
2507 
2508  if (DestType->isExtVectorType()) {
2509  SrcExpr = Self.CheckExtVectorCast(OpRange, DestType, SrcExpr.get(), Kind);
2510  return;
2511  }
2512 
2513  if (const VectorType *DestVecTy = DestType->getAs<VectorType>()) {
2514  if (DestVecTy->getVectorKind() == VectorType::AltiVecVector &&
2515  (SrcType->isIntegerType() || SrcType->isFloatingType())) {
2516  Kind = CK_VectorSplat;
2517  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2518  } else if (Self.CheckVectorCast(OpRange, DestType, SrcType, Kind)) {
2519  SrcExpr = ExprError();
2520  }
2521  return;
2522  }
2523 
2524  if (SrcType->isVectorType()) {
2525  if (Self.CheckVectorCast(OpRange, SrcType, DestType, Kind))
2526  SrcExpr = ExprError();
2527  return;
2528  }
2529 
2530  // The source and target types are both scalars, i.e.
2531  // - arithmetic types (fundamental, enum, and complex)
2532  // - all kinds of pointers
2533  // Note that member pointers were filtered out with C++, above.
2534 
2535  if (isa<ObjCSelectorExpr>(SrcExpr.get())) {
2536  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_selector_expr);
2537  SrcExpr = ExprError();
2538  return;
2539  }
2540 
2541  // If either type is a pointer, the other type has to be either an
2542  // integer or a pointer.
2543  if (!DestType->isArithmeticType()) {
2544  if (!SrcType->isIntegralType(Self.Context) && SrcType->isArithmeticType()) {
2545  Self.Diag(SrcExpr.get()->getExprLoc(),
2546  diag::err_cast_pointer_from_non_pointer_int)
2547  << SrcType << SrcExpr.get()->getSourceRange();
2548  SrcExpr = ExprError();
2549  return;
2550  }
2551  checkIntToPointerCast(/* CStyle */ true, OpRange.getBegin(), SrcExpr.get(),
2552  DestType, Self);
2553  } else if (!SrcType->isArithmeticType()) {
2554  if (!DestType->isIntegralType(Self.Context) &&
2555  DestType->isArithmeticType()) {
2556  Self.Diag(SrcExpr.get()->getLocStart(),
2557  diag::err_cast_pointer_to_non_pointer_int)
2558  << DestType << SrcExpr.get()->getSourceRange();
2559  SrcExpr = ExprError();
2560  return;
2561  }
2562  }
2563 
2564  if (Self.getLangOpts().OpenCL &&
2565  !Self.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
2566  if (DestType->isHalfType()) {
2567  Self.Diag(SrcExpr.get()->getLocStart(), diag::err_opencl_cast_to_half)
2568  << DestType << SrcExpr.get()->getSourceRange();
2569  SrcExpr = ExprError();
2570  return;
2571  }
2572  }
2573 
2574  // ARC imposes extra restrictions on casts.
2576  checkObjCConversion(Sema::CCK_CStyleCast);
2577  if (SrcExpr.isInvalid())
2578  return;
2579 
2580  const PointerType *CastPtr = DestType->getAs<PointerType>();
2581  if (Self.getLangOpts().ObjCAutoRefCount && CastPtr) {
2582  if (const PointerType *ExprPtr = SrcType->getAs<PointerType>()) {
2583  Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
2584  Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
2585  if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
2586  ExprPtr->getPointeeType()->isObjCLifetimeType() &&
2587  !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
2588  Self.Diag(SrcExpr.get()->getLocStart(),
2589  diag::err_typecheck_incompatible_ownership)
2590  << SrcType << DestType << Sema::AA_Casting
2591  << SrcExpr.get()->getSourceRange();
2592  return;
2593  }
2594  }
2595  }
2596  else if (!Self.CheckObjCARCUnavailableWeakConversion(DestType, SrcType)) {
2597  Self.Diag(SrcExpr.get()->getLocStart(),
2598  diag::err_arc_convesion_of_weak_unavailable)
2599  << 1 << SrcType << DestType << SrcExpr.get()->getSourceRange();
2600  SrcExpr = ExprError();
2601  return;
2602  }
2603  }
2604 
2605  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2606  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2607  DiagnoseBadFunctionCast(Self, SrcExpr, DestType);
2608  Kind = Self.PrepareScalarCast(SrcExpr, DestType);
2609  if (SrcExpr.isInvalid())
2610  return;
2611 
2612  if (Kind == CK_BitCast)
2613  checkCastAlign();
2614 }
2615 
2616 /// DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either
2617 /// const, volatile or both.
2618 static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
2619  QualType DestType) {
2620  if (SrcExpr.isInvalid())
2621  return;
2622 
2623  QualType SrcType = SrcExpr.get()->getType();
2624  if (!((SrcType->isAnyPointerType() && DestType->isAnyPointerType()) ||
2625  DestType->isLValueReferenceType()))
2626  return;
2627 
2628  QualType TheOffendingSrcType, TheOffendingDestType;
2629  Qualifiers CastAwayQualifiers;
2630  if (!CastsAwayConstness(Self, SrcType, DestType, true, false,
2631  &TheOffendingSrcType, &TheOffendingDestType,
2632  &CastAwayQualifiers))
2633  return;
2634 
2635  int qualifiers = -1;
2636  if (CastAwayQualifiers.hasConst() && CastAwayQualifiers.hasVolatile()) {
2637  qualifiers = 0;
2638  } else if (CastAwayQualifiers.hasConst()) {
2639  qualifiers = 1;
2640  } else if (CastAwayQualifiers.hasVolatile()) {
2641  qualifiers = 2;
2642  }
2643  // This is a variant of int **x; const int **y = (const int **)x;
2644  if (qualifiers == -1)
2645  Self.Diag(SrcExpr.get()->getLocStart(), diag::warn_cast_qual2)
2646  << SrcType << DestType;
2647  else
2648  Self.Diag(SrcExpr.get()->getLocStart(), diag::warn_cast_qual)
2649  << TheOffendingSrcType << TheOffendingDestType << qualifiers;
2650 }
2651 
2653  TypeSourceInfo *CastTypeInfo,
2654  SourceLocation RPLoc,
2655  Expr *CastExpr) {
2656  CastOperation Op(*this, CastTypeInfo->getType(), CastExpr);
2657  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
2658  Op.OpRange = SourceRange(LPLoc, CastExpr->getLocEnd());
2659 
2660  if (getLangOpts().CPlusPlus) {
2661  Op.CheckCXXCStyleCast(/*FunctionalStyle=*/ false,
2662  isa<InitListExpr>(CastExpr));
2663  } else {
2664  Op.CheckCStyleCast();
2665  }
2666 
2667  if (Op.SrcExpr.isInvalid())
2668  return ExprError();
2669 
2670  // -Wcast-qual
2671  DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
2672 
2673  return Op.complete(CStyleCastExpr::Create(Context, Op.ResultType,
2674  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
2675  &Op.BasePath, CastTypeInfo, LPLoc, RPLoc));
2676 }
2677 
2679  QualType Type,
2680  SourceLocation LPLoc,
2681  Expr *CastExpr,
2682  SourceLocation RPLoc) {
2683  assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
2684  CastOperation Op(*this, Type, CastExpr);
2685  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
2686  Op.OpRange = SourceRange(Op.DestRange.getBegin(), CastExpr->getLocEnd());
2687 
2688  Op.CheckCXXCStyleCast(/*FunctionalStyle=*/true, /*ListInit=*/false);
2689  if (Op.SrcExpr.isInvalid())
2690  return ExprError();
2691 
2692  auto *SubExpr = Op.SrcExpr.get();
2693  if (auto *BindExpr = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
2694  SubExpr = BindExpr->getSubExpr();
2695  if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
2696  ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
2697 
2698  return Op.complete(CXXFunctionalCastExpr::Create(Context, Op.ResultType,
2699  Op.ValueKind, CastTypeInfo, Op.Kind,
2700  Op.SrcExpr.get(), &Op.BasePath, LPLoc, RPLoc));
2701 }
Defines the clang::ASTContext interface.
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1698
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.
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2285
QualType getPointeeType() const
Definition: Type.h:2298
A (possibly-)qualified type.
Definition: Type.h:653
bool isBlockPointerType() const
Definition: Type.h:5952
bool isMemberPointerType() const
Definition: Type.h:5975
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
A cast other than a C-style cast.
Definition: Sema.h:9229
SourceRange getSourceRange() const LLVM_READONLY
Retrieve the source range covering the entirety of this nested-name-specifier.
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D...
bool isArithmeticType() const
Definition: Type.cpp:1908
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3058
ARCConversionResult CheckObjCConversion(SourceRange castRange, QualType castType, Expr *&op, CheckedConversionKind CCK, bool Diagnose=true, bool DiagnoseCFAudited=false, BinaryOperatorKind Opc=BO_PtrMemD)
Checks for invalid conversions and casts between retainable pointers and other pointer kinds for ARC ...
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:456
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:223
static CXXDynamicCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind Kind, Expr *Op, const CXXCastPath *Path, TypeSourceInfo *Written, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:579
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:1893
bool isRecordType() const
Definition: Type.h:6017
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1880
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1270
static TryCastResult TryStaticCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, Sema::CheckedConversionKind CCK, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath, bool ListInitialization)
TryStaticCast - Check if a static cast can be performed, and do so if possible.
Definition: SemaCast.cpp:984
bool isExtVectorType() const
Definition: Type.h:6033
The cast method is appropriate and successful.
Definition: SemaCast.cpp:35
FailureKind getFailureKind() const
Determine why initialization failed.
CanQualType ARCUnbridgedCastTy
Definition: ASTContext.h:1015
The base class of the type hierarchy.
Definition: Type.h:1353
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
StringRef getLastMacroWithSpelling(SourceLocation Loc, ArrayRef< TokenValue > Tokens) const
Return the name of the macro defined before Loc that has spelling Tokens.
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:395
Overloading for a user-defined conversion failed.
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
Ambiguous candidates found.
Definition: Overload.h:43
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:671
A container of type source information.
Definition: Decl.h:86
static CXXFunctionalCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, TypeSourceInfo *Written, CastKind Kind, Expr *Op, const CXXCastPath *Path, SourceLocation LPLoc, SourceLocation RPLoc)
Definition: ExprCXX.cpp:675
Represents a path from a specific derived class (which is not represented as part of the path) to a p...
static_cast
Definition: SemaCast.cpp:42
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
bool isCompleteDefinition() const
isCompleteDefinition - Return true if this decl has its body fully specified.
Definition: Decl.h:3091
bool isUnsignedIntegerType() const
Return true if this is an integer type that is unsigned, according to C99 6.2.5p6 [which returns true...
Definition: Type.cpp:1840
bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty, CastKind &Kind)
Definition: SemaExpr.cpp:5973
An Objective-C array/dictionary subscripting which reads an object or writes at the subscripted array...
Definition: Specifiers.h:138
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1720
void removeObjCLifetime()
Definition: Type.h:347
DiagnosticsEngine & Diags
Definition: Sema.h:318
bool isEnumeralType() const
Definition: Type.h:6021
static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr, QualType DstType, SourceRange OpRange)
Diagnose casts that change the calling convention of a pointer to a function defined in the current T...
Definition: SemaCast.cpp:1775
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6307
void clear()
Clear the base-paths results.
QualType getMemberPointerType(QualType T, const Type *Cls) const
Return the uniqued reference to the type for a member pointer to the specified type in the specified ...
DeclarationName getName() const
Gets the name looked up.
Definition: ExprCXX.h:2655
bool isInvalidDecl() const
Definition: DeclBase.h:546
OpenCLOptions & getOpenCLOptions()
Definition: Sema.h:1194
Defines the clang::Expr interface and subclasses for C++ expressions.
The collection of all-type qualifiers we support.
Definition: Type.h:152
bool isRecordingPaths() const
Whether we are recording paths.
Expr * FixOverloadedFunctionReference(Expr *E, DeclAccessPair FoundDecl, FunctionDecl *Fn)
FixOverloadedFunctionReference - E is an expression that refers to a C++ overloaded function (possibl...
RecordDecl - Represents a struct/union/class.
Definition: Decl.h:3482
One of these records is kept for each identifier that is lexed.
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:859
void setRecordingPaths(bool RP)
Specify whether we should be recording paths or not.
A vector component is an element or range of elements on a vector.
Definition: Specifiers.h:129
QualType getPointeeType() const
Definition: Type.h:2402
(Type)expr
Definition: SemaCast.cpp:45
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:149
bool allowsNonTrivialObjCLifetimeQualifiers() const
True if any ObjC types may have non-trivial lifetime qualifiers.
Definition: LangOptions.h:198
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:3844
The cast method is not applicable.
Definition: SemaCast.cpp:34
A C-style cast.
Definition: Sema.h:9225
RecordDecl * getDefinition() const
getDefinition - Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:3603
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base)
Determine whether the type Derived is a C++ class that is derived from the type Base.
TryCastResult
Definition: SemaCast.cpp:33
void removeConst()
Definition: Type.h:273
bool isReferenceType() const
Definition: Type.h:5956
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
Ref_Incompatible - The two types are incompatible, so direct reference binding is not possible...
Definition: Sema.h:9593
bool isAtLeastAsQualifiedAs(QualType Other) const
Determine whether this type is at least as qualified as the other given type, requiring exact equalit...
Definition: Type.h:5874
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6221
OverloadCandidateDisplayKind
Definition: Overload.h:47
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:107
bool isInvalidType() const
Definition: DeclSpec.h:2404
bool isGLValue() const
Definition: Expr.h:252
bool isCompleteType(SourceLocation Loc, QualType T)
Definition: Sema.h:1615
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2486
PtrTy get() const
Definition: Ownership.h:162
bool UnwrapSimilarPointerTypes(QualType &T1, QualType &T2)
UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that may be similar (C++ 4...
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc, QualType T1, QualType T2, bool &DerivedToBase, bool &ObjCConversion, bool &ObjCLifetimeConversion)
CompareReferenceRelationship - Compare the two types T1 and T2 to determine whether they are referenc...
Succeeded, but refers to a deleted function.
Definition: Overload.h:44
uint32_t Offset
Definition: CacheTokens.cpp:43
Ref_Compatible - The two types are reference-compatible.
Definition: Sema.h:9599
OverloadCandidateSet & getFailedCandidateSet()
Retrieve a reference to the candidate set when overload resolution fails.
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:405
std::string getAsString() const
Definition: Type.h:979
const Type * getClass() const
Definition: Type.h:2538
bool isRValueReferenceType() const
Definition: Type.h:5964
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:9221
static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:1916
FunctionDecl * ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr, QualType TargetType, bool Complain, DeclAccessPair &Found, bool *pHadMultipleCandidates=nullptr)
ResolveAddressOfOverloadedFunction - Try to resolve the address of an overloaded function (C++ [over...
ExprResult Perform(Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind, MultiExprArg Args, QualType *ResultType=nullptr)
Perform the actual initialization of the given entity based on the computed initialization sequence...
Definition: SemaInit.cpp:6530
const RecordType * getDetectedVirtual() const
The virtual base discovered on the path (if we are merely detecting virtuals).
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5720
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:2710
static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either const, volatile or both...
Definition: SemaCast.cpp:2618
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang&#39;s AST.
const LangOptions & getLangOpts() const
Definition: Sema.h:1193
ExprResult DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose=true)
Definition: SemaExpr.cpp:626
bool isScalarType() const
Definition: Type.h:6206
bool compatiblyIncludesObjCLifetime(Qualifiers other) const
Determines if these qualifiers compatibly include another set of qualifiers from the narrow perspecti...
Definition: Type.h:518
An ordinary object is located at an address in memory.
Definition: Specifiers.h:123
static bool UnwrapDissimilarPointerTypes(QualType &T1, QualType &T2)
UnwrapDissimilarPointerTypes - Like Sema::UnwrapSimilarPointerTypes, this removes one level of indire...
Definition: SemaCast.cpp:437
CastKind PrepareScalarCast(ExprResult &src, QualType destType)
Prepares for a scalar cast, performing all the necessary stages except the final cast and returning t...
Definition: SemaExpr.cpp:5746
bool hasConst() const
Definition: Type.h:269
bool isHalfType() const
Definition: Type.h:6177
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:274
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1590
A functional-style cast.
Definition: Sema.h:9227
bool compatiblyIncludes(Qualifiers other) const
Determines if these qualifiers compatibly include another set.
Definition: Type.h:497
bool isComplexType() const
isComplexType() does not include complex integers (a GCC extension).
Definition: Type.cpp:438
CastKind
CastKind - The kind of operation required for a conversion.
SourceLocation getLocEnd() const LLVM_READONLY
Definition: Stmt.cpp:290
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1718
static TryCastResult TryConstCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg)
TryConstCast - See if a const_cast from source to destination is allowed, and perform it if it is...
Definition: SemaCast.cpp:1588
bool isEnabled(llvm::StringRef Ext) const
Definition: OpenCLOptions.h:39
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:39
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:133
bool isEventT() const
Definition: Type.h:6102
Expr - This represents one expression.
Definition: Expr.h:106
static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType, SourceRange opRange, Expr *src, QualType destType, bool listInitialization)
Diagnose a failed cast.
Definition: SemaCast.cpp:389
QualType getPointeeType() const
Definition: Type.h:2442
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:104
static InitializationKind CreateFunctionalCast(SourceRange TypeRange, bool InitList)
Create a direct initialization for a functional cast.
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath)
static FindResult find(Expr *E)
Finds the overloaded expression in the given expression E of OverloadTy.
Definition: ExprCXX.h:2612
const CXXRecordDecl * getPointeeCXXRecordDecl() const
If this is a pointer or reference to a RecordType, return the CXXRecordDecl that that type refers to...
Definition: Type.cpp:1575
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6370
OverloadingResult getFailedOverloadResult() const
Get the overloading result, for when the initialization sequence failed due to a bad overload...
Defines the clang::Preprocessor interface.
bool isNullPtrType() const
Definition: Type.h:6184
static CXXStaticCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *Path, TypeSourceInfo *Written, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:554
CXXRecordDecl * getDefinition() const
Definition: DeclCXX.h:731
Overload resolution succeeded.
Definition: Overload.h:41
ExprResult BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, TypeSourceInfo *Ty, Expr *E, SourceRange AngleBrackets, SourceRange Parens)
Definition: SemaCast.cpp:240
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:88
ExprResult CheckPlaceholderExpr(Expr *E)
Check for operands with placeholder types and complain if found.
Definition: SemaExpr.cpp:15942
static TryCastResult TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, Sema::CheckedConversionKind CCK, SourceRange OpRange, unsigned &msg, CastKind &Kind, bool ListInitialization)
TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2 is valid: ...
Definition: SemaCast.cpp:1533
bool isConstructorInitialization() const
Determine whether this initialization is direct call to a constructor.
Definition: SemaInit.cpp:3198
ReferenceCompareResult
ReferenceCompareResult - Expresses the result of comparing two types (cv1 T1 and cv2 T2) to determine...
Definition: Sema.h:9590
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:7364
bool isSignedIntegerType() const
Return true if this is an integer type that is signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], or an enum decl which has a signed representation.
Definition: Type.cpp:1800
QualType getType() const
Definition: Expr.h:128
static TryCastResult TryStaticMemberPointerUpcast(Sema &Self, ExprResult &SrcExpr, QualType SrcType, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
TryStaticMemberPointerUpcast - Tests whether a conversion according to C++ 5.2.9p9 is valid: ...
Definition: SemaCast.cpp:1415
bool ResolveAndFixSingleFunctionTemplateSpecialization(ExprResult &SrcExpr, bool DoFunctionPointerConverion=false, bool Complain=false, SourceRange OpRangeForComplaining=SourceRange(), QualType DestTypeForComplaining=QualType(), unsigned DiagIDForComplaining=0)
bool resolveAndFixAddressOfOnlyViableOverloadCandidate(ExprResult &SrcExpr, bool DoFunctionPointerConversion=false)
Given an overloaded function, tries to turn it into a non-overloaded function reference using resolve...
Type(expr)
Definition: SemaCast.cpp:46
bool isAtLeastAsQualifiedAs(CanQual< T > Other) const
Determines whether this canonical type is at least as qualified as the Other canonical type...
bool isInvalid() const
Definition: Ownership.h:158
SourceLocation getEnd() const
Preprocessor & getPreprocessor() const
Definition: Sema.h:1199
Represents a GCC generic vector type.
Definition: Type.h:2916
An lvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2468
static TryCastResult TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
Tests whether a conversion according to C++ 5.2.9p5 is valid.
Definition: SemaCast.cpp:1231
bool isUsable() const
Definition: Ownership.h:159
bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, CastKind &Kind)
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1347
The result type of a method or function.
void removeCVRQualifiers(unsigned mask)
Definition: Type.h:296
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:233
bool isKeyword(const LangOptions &LangOpts) const
Return true if this token is a keyword in the specified language.
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty, SourceLocation RParenLoc, Expr *Op)
Definition: SemaCast.cpp:2652
bool isVoidPointerType() const
Definition: Type.cpp:426
bool areLaxCompatibleVectorTypes(QualType srcType, QualType destType)
Are the two types lax-compatible vector types? That is, given that one of them is a vector...
Definition: SemaExpr.cpp:5938
RecordDecl * getDecl() const
Definition: Type.h:3988
static TryCastResult TryStaticDowncast(Sema &Self, CanQualType SrcType, CanQualType DestType, bool CStyle, SourceRange OpRange, QualType OrigSrcType, QualType OrigDestType, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and TryStaticPointerDowncast.
Definition: SemaCast.cpp:1303
CanQualType OverloadTy
Definition: ASTContext.h:1013
static CXXConstCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, Expr *Op, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:661
Kind
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr...
Definition: ExprCXX.h:2548
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:144
ASTContext & getASTContext() const
Definition: Sema.h:1200
Encodes a location in the source.
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums...
Definition: Type.h:4004
CastKind PrepareCastToObjCObjectPointer(ExprResult &E)
Prepare a conversion of the given expression to an ObjC object pointer type.
Definition: SemaExpr.cpp:5731
static TryCastResult TryStaticPointerDowncast(Sema &Self, QualType SrcType, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind, CXXCastPath &BasePath)
Tests whether a conversion according to C++ 5.2.9p8 is valid.
Definition: SemaCast.cpp:1269
static const FieldDecl * getTargetFieldForToUnionCast(QualType unionType, QualType opType)
Definition: Expr.cpp:1698
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1722
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1964
paths_iterator begin()
ExprResult ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, SourceLocation LAngleBracketLoc, Declarator &D, SourceLocation RAngleBracketLoc, SourceLocation LParenLoc, Expr *E, SourceLocation RParenLoc)
ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast&#39;s.
Definition: SemaCast.cpp:217
bool CheckObjCARCUnavailableWeakConversion(QualType castType, QualType ExprType)
std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths)
Builds a string representing ambiguous paths from a specific derived class to different subobjects of...
Represents a canonical, potentially-qualified type.
Definition: CanonicalType.h:66
CanQualType VoidTy
Definition: ASTContext.h:996
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
Describes the kind of initialization being performed, along with location information for tokens rela...
const_cast
Definition: SemaCast.cpp:41
bool isMemberFunctionPointerType() const
Definition: Type.h:5979
bool isObjCObjectPointerType() const
Definition: Type.h:6041
bool isAnyPointerType() const
Definition: Type.h:5948
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language...
Definition: Expr.h:249
Overloading for initialization by constructor failed.
is AltiVec vector
Definition: Type.h:2923
Requests that all candidates be shown.
Definition: Overload.h:50
bool isAddressSpaceOverlapping(const PointerType &other) const
Returns true if address spaces of pointers overlap.
Definition: Type.h:2308
bool isAnyCharacterType() const
Determine whether this type is any of the built-in character types.
Definition: Type.cpp:1780
bool isVectorType() const
Definition: Type.h:6029
void removeObjCGCAttr()
Definition: Type.h:324
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13...
Definition: Overload.h:724
reinterpret_cast
Definition: SemaCast.cpp:43
static InitializationKind CreateCast(SourceRange TypeRange)
Create a direct initialization due to a cast that isn&#39;t a C-style or functional cast.
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2214
static CXXReinterpretCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind Kind, Expr *Op, const CXXCastPath *Path, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:638
CanProxy< U > getAs() const
Retrieve a canonical type pointer with a different static type, upcasting or downcasting as needed...
ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType, Expr *CastExpr, CastKind &CastKind, ExprValueKind &VK, CXXCastPath &Path)
Check a cast of an unknown-any type.
Definition: SemaExpr.cpp:15850
A POD class for pairing a NamedDecl* with an access specifier.
bool isPlaceholderType() const
Test for a type which does not represent an actual type-system type but is instead used as a placehol...
Definition: Type.h:6145
dynamic_cast
Definition: SemaCast.cpp:44
Represents an element in a path from a derived class to a base class.
CallingConv getDefaultCallingConvention(bool IsVariadic, bool IsCXXMethod) const
Retrieves the default calling convention for the current target.
std::list< CXXBasePath >::const_iterator const_paths_iterator
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType, bool IsDereference, SourceRange Range)
Definition: SemaCast.cpp:1706
The cast method is appropriate, but failed.
Definition: SemaCast.cpp:36
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2085
bool isBooleanType() const
Definition: Type.h:6234
ExprResult prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr)
Prepare SplattedExpr for a vector splat operation, adding implicit casts if necessary.
Definition: SemaExpr.cpp:5993
static void checkIntToPointerCast(bool CStyle, SourceLocation Loc, const Expr *SrcExpr, QualType DestType, Sema &Self)
Definition: SemaCast.cpp:1863
Requests that only viable candidates be shown.
Definition: Overload.h:53
bool isAmbiguous(CanQualType BaseType)
Determine whether the path from the most-derived type to the given base type is ambiguous (i...
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2504
bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx, SourceLocation *Loc=nullptr, bool isEvaluated=true) const
isIntegerConstantExpr - Return true if this expression is a valid integer constant expression...
void setCVRQualifiers(unsigned mask)
Definition: Type.h:292
static InitializationKind CreateCStyleCast(SourceLocation StartLoc, SourceRange TypeRange, bool InitList)
Create a direct initialization for a C-style cast.
void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange)
CheckCastAlign - Implements -Wcast-align, which warns when a pointer cast increases the alignment req...
static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:1756
static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType, ExprResult &Result)
Definition: SemaCast.cpp:1889
Expr * IgnoreParenImpCasts() LLVM_READONLY
IgnoreParenImpCasts - Ignore parentheses and implicit casts.
Definition: Expr.cpp:2552
ExprResult IgnoredValueConversions(Expr *E)
IgnoredValueConversions - Given that an expression&#39;s result is syntactically ignored, perform any conversions that are required.
Represents a pointer to an Objective C object.
Definition: Type.h:5442
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:150
Pointer to a block type.
Definition: Type.h:2387
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:3978
static bool tryDiagnoseOverloadedCast(Sema &S, CastType CT, SourceRange range, Expr *src, QualType destType, bool listInitialization)
Try to diagnose a failed overloaded cast.
Definition: SemaCast.cpp:313
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6193
ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr, CastKind &Kind)
Definition: SemaExpr.cpp:6026
static CStyleCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *BasePath, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation R)
Definition: Expr.cpp:1739
bool CheckDerivedToBaseConversion(QualType Derived, QualType Base, SourceLocation Loc, SourceRange Range, CXXCastPath *BasePath=nullptr, bool IgnoreAccess=false)
bool isFunctionType() const
Definition: Type.h:5940
MaterializeTemporaryExpr * CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary, bool BoundToLvalueReference)
Definition: SemaInit.cpp:6496
CXXBasePath & front()
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2421
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2190
static bool CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType, bool CheckCVR, bool CheckObjCLifetime, QualType *TheOffendingSrcType=nullptr, QualType *TheOffendingDestType=nullptr, Qualifiers *CastAwayQualifiers=nullptr)
CastsAwayConstness - Check if the pointer conversion from SrcType to DestType casts away constness as...
Definition: SemaCast.cpp:517
static TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr, QualType DestType, bool CStyle, CastKind &Kind, CXXCastPath &BasePath, unsigned &msg)
Tests whether a conversion according to N2844 is valid.
Definition: SemaCast.cpp:1173
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:90
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
QualType getNonLValueExprType(const ASTContext &Context) const
Determine the type of a (typically non-lvalue) expression with the specified result type...
Definition: Type.cpp:2676
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:126
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2007
bool isObjCObjectType() const
Definition: Type.h:6045
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2174
bool isLValueReferenceType() const
Definition: Type.h:5960
ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type, SourceLocation LParenLoc, Expr *CastExpr, SourceLocation RParenLoc)
Definition: SemaCast.cpp:2678
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:239
bool Failed() const
Determine whether the initialization sequence is invalid.
CallingConv getCallConv() const
Definition: Type.h:3213
Describes the sequence of initializations required to initialize a given object or reference with a s...
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:5800
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2528
bool isVoidType() const
Definition: Type.h:6171
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:5747
AccessResult CheckBaseClassAccess(SourceLocation AccessLoc, QualType Base, QualType Derived, const CXXBasePath &Path, unsigned DiagID, bool ForceCheck=false, bool ForceUnprivileged=false)
Checks access for a hierarchy conversion.
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
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:127
This class is used for builtin types like &#39;int&#39;.
Definition: Type.h:2145
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:265
Defines the clang::TargetInfo interface.
bool isComplexIntegerType() const
Definition: Type.cpp:444
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:154
unsigned getCVRQualifiers() const
Definition: Type.h:291
ExprResult ExprError()
Definition: Ownership.h:267
bool hasVolatile() const
Definition: Type.h:276
bool IsQualificationConversion(QualType FromType, QualType ToType, bool CStyle, bool &ObjCLifetimeConversion)
IsQualificationConversion - Determines whether the conversion from an rvalue of type FromType to ToTy...
static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
DiagnoseBadFunctionCast - Warn whenever a function call is cast to a non-matching type...
Definition: SemaCast.cpp:2351
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:1860
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:956
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:734
bool isUnion() const
Definition: Decl.h:3159
NestedNameSpecifierLoc getQualifierLoc() const
Fetches the nested-name qualifier with source-location information, if one was given.
Definition: ExprCXX.h:2667
bool isPointerType() const
Definition: Type.h:5944
void NoteAllOverloadCandidates(Expr *E, QualType DestType=QualType(), bool TakingAddress=false)
BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
No viable function found.
Definition: Overload.h:42
static StringRef getNameForCallConv(CallingConv CC)
Definition: Type.cpp:2692
bool isFloatingType() const
Definition: Type.cpp:1877
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:316
paths_iterator end()
Describes an entity that is being initialized.
bool isFunctionPointerType() const
Definition: Type.h:5968
SourceLocation getLocStart() const LLVM_READONLY
Definition: Stmt.cpp:277
SourceLocation getBegin() const
const LangOptions & getLangOpts() const
Definition: ASTContext.h:688
void NoteCandidates(Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef< Expr *> Args, StringRef Opc="", SourceLocation Loc=SourceLocation(), llvm::function_ref< bool(OverloadCandidate &)> Filter=[](OverloadCandidate &) { return true;})
PrintOverloadCandidates - When overload resolution fails, prints diagnostic messages containing the c...
QualType getUnqualifiedArrayType(QualType T, Qualifiers &Quals)
Return this type as a completely-unqualified array type, capturing the qualifiers in Quals...
bool isIncompleteOrObjectType() const
Return true if this is an incomplete or object type, in other words, not a function type...
Definition: Type.h:1665
CastType
Definition: SemaCast.cpp:40
QualType getPointeeType() const
Definition: Type.h:2524
static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr, QualType DestType, SourceRange OpRange)
Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast or downcast between respective...
Definition: SemaCast.cpp:785
QualType getType() const
Return the type wrapped by this type source info.
Definition: Decl.h:97
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:127
QualType getPointeeType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5458