clang  14.0.0git
SemaCast.cpp
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1 //===--- SemaCast.cpp - Semantic Analysis for Casts -----------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements semantic analysis for cast expressions, including
10 // 1) C-style casts like '(int) x'
11 // 2) C++ functional casts like 'int(x)'
12 // 3) C++ named casts like 'static_cast<int>(x)'
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/AST/ExprObjC.h"
21 #include "clang/AST/RecordLayout.h"
23 #include "clang/Basic/TargetInfo.h"
24 #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_Extension, ///< The cast method is appropriate and accepted as a
37  ///< language extension.
38  TC_Failed ///< The cast method is appropriate, but failed. A
39  ///< diagnostic has been emitted.
40 };
41 
42 static bool isValidCast(TryCastResult TCR) {
43  return TCR == TC_Success || TCR == TC_Extension;
44 }
45 
46 enum CastType {
47  CT_Const, ///< const_cast
48  CT_Static, ///< static_cast
49  CT_Reinterpret, ///< reinterpret_cast
50  CT_Dynamic, ///< dynamic_cast
51  CT_CStyle, ///< (Type)expr
52  CT_Functional, ///< Type(expr)
53  CT_Addrspace ///< addrspace_cast
54 };
55 
56 namespace {
57  struct CastOperation {
58  CastOperation(Sema &S, QualType destType, ExprResult src)
59  : Self(S), SrcExpr(src), DestType(destType),
60  ResultType(destType.getNonLValueExprType(S.Context)),
61  ValueKind(Expr::getValueKindForType(destType)),
62  Kind(CK_Dependent), IsARCUnbridgedCast(false) {
63 
64  // C++ [expr.type]/8.2.2:
65  // If a pr-value initially has the type cv-T, where T is a
66  // cv-unqualified non-class, non-array type, the type of the
67  // expression is adjusted to T prior to any further analysis.
68  if (!S.Context.getLangOpts().ObjC && !DestType->isRecordType() &&
69  !DestType->isArrayType()) {
70  DestType = DestType.getUnqualifiedType();
71  }
72 
73  if (const BuiltinType *placeholder =
74  src.get()->getType()->getAsPlaceholderType()) {
75  PlaceholderKind = placeholder->getKind();
76  } else {
77  PlaceholderKind = (BuiltinType::Kind) 0;
78  }
79  }
80 
81  Sema &Self;
82  ExprResult SrcExpr;
83  QualType DestType;
84  QualType ResultType;
85  ExprValueKind ValueKind;
86  CastKind Kind;
87  BuiltinType::Kind PlaceholderKind;
88  CXXCastPath BasePath;
89  bool IsARCUnbridgedCast;
90 
91  SourceRange OpRange;
92  SourceRange DestRange;
93 
94  // Top-level semantics-checking routines.
95  void CheckConstCast();
96  void CheckReinterpretCast();
97  void CheckStaticCast();
98  void CheckDynamicCast();
99  void CheckCXXCStyleCast(bool FunctionalCast, bool ListInitialization);
100  void CheckCStyleCast();
101  void CheckBuiltinBitCast();
102  void CheckAddrspaceCast();
103 
104  void updatePartOfExplicitCastFlags(CastExpr *CE) {
105  // Walk down from the CE to the OrigSrcExpr, and mark all immediate
106  // ImplicitCastExpr's as being part of ExplicitCastExpr. The original CE
107  // (which is a ExplicitCastExpr), and the OrigSrcExpr are not touched.
108  for (; auto *ICE = dyn_cast<ImplicitCastExpr>(CE->getSubExpr()); CE = ICE)
109  ICE->setIsPartOfExplicitCast(true);
110  }
111 
112  /// Complete an apparently-successful cast operation that yields
113  /// the given expression.
114  ExprResult complete(CastExpr *castExpr) {
115  // If this is an unbridged cast, wrap the result in an implicit
116  // cast that yields the unbridged-cast placeholder type.
117  if (IsARCUnbridgedCast) {
119  Self.Context, Self.Context.ARCUnbridgedCastTy, CK_Dependent,
120  castExpr, nullptr, castExpr->getValueKind(),
121  Self.CurFPFeatureOverrides());
122  }
123  updatePartOfExplicitCastFlags(castExpr);
124  return castExpr;
125  }
126 
127  // Internal convenience methods.
128 
129  /// Try to handle the given placeholder expression kind. Return
130  /// true if the source expression has the appropriate placeholder
131  /// kind. A placeholder can only be claimed once.
132  bool claimPlaceholder(BuiltinType::Kind K) {
133  if (PlaceholderKind != K) return false;
134 
135  PlaceholderKind = (BuiltinType::Kind) 0;
136  return true;
137  }
138 
139  bool isPlaceholder() const {
140  return PlaceholderKind != 0;
141  }
142  bool isPlaceholder(BuiltinType::Kind K) const {
143  return PlaceholderKind == K;
144  }
145 
146  // Language specific cast restrictions for address spaces.
147  void checkAddressSpaceCast(QualType SrcType, QualType DestType);
148 
149  void checkCastAlign() {
150  Self.CheckCastAlign(SrcExpr.get(), DestType, OpRange);
151  }
152 
153  void checkObjCConversion(Sema::CheckedConversionKind CCK) {
155 
156  Expr *src = SrcExpr.get();
157  if (Self.CheckObjCConversion(OpRange, DestType, src, CCK) ==
159  IsARCUnbridgedCast = true;
160  SrcExpr = src;
161  }
162 
163  /// Check for and handle non-overload placeholder expressions.
164  void checkNonOverloadPlaceholders() {
165  if (!isPlaceholder() || isPlaceholder(BuiltinType::Overload))
166  return;
167 
168  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
169  if (SrcExpr.isInvalid())
170  return;
171  PlaceholderKind = (BuiltinType::Kind) 0;
172  }
173  };
174 
175  void CheckNoDeref(Sema &S, const QualType FromType, const QualType ToType,
176  SourceLocation OpLoc) {
177  if (const auto *PtrType = dyn_cast<PointerType>(FromType)) {
178  if (PtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
179  if (const auto *DestType = dyn_cast<PointerType>(ToType)) {
180  if (!DestType->getPointeeType()->hasAttr(attr::NoDeref)) {
181  S.Diag(OpLoc, diag::warn_noderef_to_dereferenceable_pointer);
182  }
183  }
184  }
185  }
186  }
187 
188  struct CheckNoDerefRAII {
189  CheckNoDerefRAII(CastOperation &Op) : Op(Op) {}
190  ~CheckNoDerefRAII() {
191  if (!Op.SrcExpr.isInvalid())
192  CheckNoDeref(Op.Self, Op.SrcExpr.get()->getType(), Op.ResultType,
193  Op.OpRange.getBegin());
194  }
195 
196  CastOperation &Op;
197  };
198 }
199 
200 static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
201  QualType DestType);
202 
203 // The Try functions attempt a specific way of casting. If they succeed, they
204 // return TC_Success. If their way of casting is not appropriate for the given
205 // arguments, they return TC_NotApplicable and *may* set diag to a diagnostic
206 // to emit if no other way succeeds. If their way of casting is appropriate but
207 // fails, they return TC_Failed and *must* set diag; they can set it to 0 if
208 // they emit a specialized diagnostic.
209 // All diagnostics returned by these functions must expect the same three
210 // arguments:
211 // %0: Cast Type (a value from the CastType enumeration)
212 // %1: Source Type
213 // %2: Destination Type
214 static TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr,
215  QualType DestType, bool CStyle,
216  CastKind &Kind,
217  CXXCastPath &BasePath,
218  unsigned &msg);
219 static TryCastResult TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr,
220  QualType DestType, bool CStyle,
221  SourceRange OpRange,
222  unsigned &msg,
223  CastKind &Kind,
224  CXXCastPath &BasePath);
226  QualType DestType, bool CStyle,
227  SourceRange OpRange,
228  unsigned &msg,
229  CastKind &Kind,
230  CXXCastPath &BasePath);
231 static TryCastResult TryStaticDowncast(Sema &Self, CanQualType SrcType,
232  CanQualType DestType, bool CStyle,
233  SourceRange OpRange,
234  QualType OrigSrcType,
235  QualType OrigDestType, unsigned &msg,
236  CastKind &Kind,
237  CXXCastPath &BasePath);
239  QualType SrcType,
240  QualType DestType,bool CStyle,
241  SourceRange OpRange,
242  unsigned &msg,
243  CastKind &Kind,
244  CXXCastPath &BasePath);
245 
246 static TryCastResult TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr,
247  QualType DestType,
249  SourceRange OpRange,
250  unsigned &msg, CastKind &Kind,
251  bool ListInitialization);
252 static TryCastResult TryStaticCast(Sema &Self, ExprResult &SrcExpr,
253  QualType DestType,
255  SourceRange OpRange,
256  unsigned &msg, CastKind &Kind,
257  CXXCastPath &BasePath,
258  bool ListInitialization);
259 static TryCastResult TryConstCast(Sema &Self, ExprResult &SrcExpr,
260  QualType DestType, bool CStyle,
261  unsigned &msg);
262 static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
263  QualType DestType, bool CStyle,
264  SourceRange OpRange, unsigned &msg,
265  CastKind &Kind);
266 static TryCastResult TryAddressSpaceCast(Sema &Self, ExprResult &SrcExpr,
267  QualType DestType, bool CStyle,
268  unsigned &msg, CastKind &Kind);
269 
270 /// ActOnCXXNamedCast - Parse
271 /// {dynamic,static,reinterpret,const,addrspace}_cast's.
274  SourceLocation LAngleBracketLoc, Declarator &D,
275  SourceLocation RAngleBracketLoc,
276  SourceLocation LParenLoc, Expr *E,
277  SourceLocation RParenLoc) {
278 
279  assert(!D.isInvalidType());
280 
282  if (D.isInvalidType())
283  return ExprError();
284 
285  if (getLangOpts().CPlusPlus) {
286  // Check that there are no default arguments (C++ only).
288  }
289 
290  return BuildCXXNamedCast(OpLoc, Kind, TInfo, E,
291  SourceRange(LAngleBracketLoc, RAngleBracketLoc),
292  SourceRange(LParenLoc, RParenLoc));
293 }
294 
297  TypeSourceInfo *DestTInfo, Expr *E,
298  SourceRange AngleBrackets, SourceRange Parens) {
299  ExprResult Ex = E;
300  QualType DestType = DestTInfo->getType();
301 
302  // If the type is dependent, we won't do the semantic analysis now.
303  bool TypeDependent =
304  DestType->isDependentType() || Ex.get()->isTypeDependent();
305 
306  CastOperation Op(*this, DestType, E);
307  Op.OpRange = SourceRange(OpLoc, Parens.getEnd());
308  Op.DestRange = AngleBrackets;
309 
310  switch (Kind) {
311  default: llvm_unreachable("Unknown C++ cast!");
312 
313  case tok::kw_addrspace_cast:
314  if (!TypeDependent) {
315  Op.CheckAddrspaceCast();
316  if (Op.SrcExpr.isInvalid())
317  return ExprError();
318  }
319  return Op.complete(CXXAddrspaceCastExpr::Create(
320  Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
321  DestTInfo, OpLoc, Parens.getEnd(), AngleBrackets));
322 
323  case tok::kw_const_cast:
324  if (!TypeDependent) {
325  Op.CheckConstCast();
326  if (Op.SrcExpr.isInvalid())
327  return ExprError();
329  }
330  return Op.complete(CXXConstCastExpr::Create(Context, Op.ResultType,
331  Op.ValueKind, Op.SrcExpr.get(), DestTInfo,
332  OpLoc, Parens.getEnd(),
333  AngleBrackets));
334 
335  case tok::kw_dynamic_cast: {
336  // dynamic_cast is not supported in C++ for OpenCL.
337  if (getLangOpts().OpenCLCPlusPlus) {
338  return ExprError(Diag(OpLoc, diag::err_openclcxx_not_supported)
339  << "dynamic_cast");
340  }
341 
342  if (!TypeDependent) {
343  Op.CheckDynamicCast();
344  if (Op.SrcExpr.isInvalid())
345  return ExprError();
346  }
347  return Op.complete(CXXDynamicCastExpr::Create(Context, Op.ResultType,
348  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
349  &Op.BasePath, DestTInfo,
350  OpLoc, Parens.getEnd(),
351  AngleBrackets));
352  }
353  case tok::kw_reinterpret_cast: {
354  if (!TypeDependent) {
355  Op.CheckReinterpretCast();
356  if (Op.SrcExpr.isInvalid())
357  return ExprError();
359  }
360  return Op.complete(CXXReinterpretCastExpr::Create(Context, Op.ResultType,
361  Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
362  nullptr, DestTInfo, OpLoc,
363  Parens.getEnd(),
364  AngleBrackets));
365  }
366  case tok::kw_static_cast: {
367  if (!TypeDependent) {
368  Op.CheckStaticCast();
369  if (Op.SrcExpr.isInvalid())
370  return ExprError();
372  }
373 
374  return Op.complete(CXXStaticCastExpr::Create(
375  Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
376  &Op.BasePath, DestTInfo, CurFPFeatureOverrides(), OpLoc,
377  Parens.getEnd(), AngleBrackets));
378  }
379  }
380 }
381 
383  ExprResult Operand,
384  SourceLocation RParenLoc) {
385  assert(!D.isInvalidType());
386 
387  TypeSourceInfo *TInfo = GetTypeForDeclaratorCast(D, Operand.get()->getType());
388  if (D.isInvalidType())
389  return ExprError();
390 
391  return BuildBuiltinBitCastExpr(KWLoc, TInfo, Operand.get(), RParenLoc);
392 }
393 
395  TypeSourceInfo *TSI, Expr *Operand,
396  SourceLocation RParenLoc) {
397  CastOperation Op(*this, TSI->getType(), Operand);
398  Op.OpRange = SourceRange(KWLoc, RParenLoc);
399  TypeLoc TL = TSI->getTypeLoc();
400  Op.DestRange = SourceRange(TL.getBeginLoc(), TL.getEndLoc());
401 
402  if (!Operand->isTypeDependent() && !TSI->getType()->isDependentType()) {
403  Op.CheckBuiltinBitCast();
404  if (Op.SrcExpr.isInvalid())
405  return ExprError();
406  }
407 
408  BuiltinBitCastExpr *BCE =
409  new (Context) BuiltinBitCastExpr(Op.ResultType, Op.ValueKind, Op.Kind,
410  Op.SrcExpr.get(), TSI, KWLoc, RParenLoc);
411  return Op.complete(BCE);
412 }
413 
414 /// Try to diagnose a failed overloaded cast. Returns true if
415 /// diagnostics were emitted.
417  SourceRange range, Expr *src,
418  QualType destType,
419  bool listInitialization) {
420  switch (CT) {
421  // These cast kinds don't consider user-defined conversions.
422  case CT_Const:
423  case CT_Reinterpret:
424  case CT_Dynamic:
425  case CT_Addrspace:
426  return false;
427 
428  // These do.
429  case CT_Static:
430  case CT_CStyle:
431  case CT_Functional:
432  break;
433  }
434 
435  QualType srcType = src->getType();
436  if (!destType->isRecordType() && !srcType->isRecordType())
437  return false;
438 
440  InitializationKind initKind
442  range, listInitialization)
444  listInitialization)
445  : InitializationKind::CreateCast(/*type range?*/ range);
446  InitializationSequence sequence(S, entity, initKind, src);
447 
448  assert(sequence.Failed() && "initialization succeeded on second try?");
449  switch (sequence.getFailureKind()) {
450  default: return false;
451 
454  break;
455  }
456 
457  OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
458 
459  unsigned msg = 0;
461 
462  switch (sequence.getFailedOverloadResult()) {
463  case OR_Success: llvm_unreachable("successful failed overload");
465  if (candidates.empty())
466  msg = diag::err_ovl_no_conversion_in_cast;
467  else
468  msg = diag::err_ovl_no_viable_conversion_in_cast;
469  howManyCandidates = OCD_AllCandidates;
470  break;
471 
472  case OR_Ambiguous:
473  msg = diag::err_ovl_ambiguous_conversion_in_cast;
474  howManyCandidates = OCD_AmbiguousCandidates;
475  break;
476 
477  case OR_Deleted:
478  msg = diag::err_ovl_deleted_conversion_in_cast;
479  howManyCandidates = OCD_ViableCandidates;
480  break;
481  }
482 
483  candidates.NoteCandidates(
484  PartialDiagnosticAt(range.getBegin(),
485  S.PDiag(msg) << CT << srcType << destType << range
486  << src->getSourceRange()),
487  S, howManyCandidates, src);
488 
489  return true;
490 }
491 
492 /// Diagnose a failed cast.
493 static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
494  SourceRange opRange, Expr *src, QualType destType,
495  bool listInitialization) {
496  if (msg == diag::err_bad_cxx_cast_generic &&
497  tryDiagnoseOverloadedCast(S, castType, opRange, src, destType,
498  listInitialization))
499  return;
500 
501  S.Diag(opRange.getBegin(), msg) << castType
502  << src->getType() << destType << opRange << src->getSourceRange();
503 
504  // Detect if both types are (ptr to) class, and note any incompleteness.
505  int DifferentPtrness = 0;
506  QualType From = destType;
507  if (auto Ptr = From->getAs<PointerType>()) {
508  From = Ptr->getPointeeType();
509  DifferentPtrness++;
510  }
511  QualType To = src->getType();
512  if (auto Ptr = To->getAs<PointerType>()) {
513  To = Ptr->getPointeeType();
514  DifferentPtrness--;
515  }
516  if (!DifferentPtrness) {
517  auto RecFrom = From->getAs<RecordType>();
518  auto RecTo = To->getAs<RecordType>();
519  if (RecFrom && RecTo) {
520  auto DeclFrom = RecFrom->getAsCXXRecordDecl();
521  if (!DeclFrom->isCompleteDefinition())
522  S.Diag(DeclFrom->getLocation(), diag::note_type_incomplete) << DeclFrom;
523  auto DeclTo = RecTo->getAsCXXRecordDecl();
524  if (!DeclTo->isCompleteDefinition())
525  S.Diag(DeclTo->getLocation(), diag::note_type_incomplete) << DeclTo;
526  }
527  }
528 }
529 
530 namespace {
531 /// The kind of unwrapping we did when determining whether a conversion casts
532 /// away constness.
533 enum CastAwayConstnessKind {
534  /// The conversion does not cast away constness.
535  CACK_None = 0,
536  /// We unwrapped similar types.
537  CACK_Similar = 1,
538  /// We unwrapped dissimilar types with similar representations (eg, a pointer
539  /// versus an Objective-C object pointer).
540  CACK_SimilarKind = 2,
541  /// We unwrapped representationally-unrelated types, such as a pointer versus
542  /// a pointer-to-member.
543  CACK_Incoherent = 3,
544 };
545 }
546 
547 /// Unwrap one level of types for CastsAwayConstness.
548 ///
549 /// Like Sema::UnwrapSimilarTypes, this removes one level of indirection from
550 /// both types, provided that they're both pointer-like or array-like. Unlike
551 /// the Sema function, doesn't care if the unwrapped pieces are related.
552 ///
553 /// This function may remove additional levels as necessary for correctness:
554 /// the resulting T1 is unwrapped sufficiently that it is never an array type,
555 /// so that its qualifiers can be directly compared to those of T2 (which will
556 /// have the combined set of qualifiers from all indermediate levels of T2),
557 /// as (effectively) required by [expr.const.cast]p7 replacing T1's qualifiers
558 /// with those from T2.
559 static CastAwayConstnessKind
561  enum { None, Ptr, MemPtr, BlockPtr, Array };
562  auto Classify = [](QualType T) {
563  if (T->isAnyPointerType()) return Ptr;
564  if (T->isMemberPointerType()) return MemPtr;
565  if (T->isBlockPointerType()) return BlockPtr;
566  // We somewhat-arbitrarily don't look through VLA types here. This is at
567  // least consistent with the behavior of UnwrapSimilarTypes.
568  if (T->isConstantArrayType() || T->isIncompleteArrayType()) return Array;
569  return None;
570  };
571 
572  auto Unwrap = [&](QualType T) {
573  if (auto *AT = Context.getAsArrayType(T))
574  return AT->getElementType();
575  return T->getPointeeType();
576  };
577 
578  CastAwayConstnessKind Kind;
579 
580  if (T2->isReferenceType()) {
581  // Special case: if the destination type is a reference type, unwrap it as
582  // the first level. (The source will have been an lvalue expression in this
583  // case, so there is no corresponding "reference to" in T1 to remove.) This
584  // simulates removing a "pointer to" from both sides.
585  T2 = T2->getPointeeType();
586  Kind = CastAwayConstnessKind::CACK_Similar;
587  } else if (Context.UnwrapSimilarTypes(T1, T2)) {
588  Kind = CastAwayConstnessKind::CACK_Similar;
589  } else {
590  // Try unwrapping mismatching levels.
591  int T1Class = Classify(T1);
592  if (T1Class == None)
593  return CastAwayConstnessKind::CACK_None;
594 
595  int T2Class = Classify(T2);
596  if (T2Class == None)
597  return CastAwayConstnessKind::CACK_None;
598 
599  T1 = Unwrap(T1);
600  T2 = Unwrap(T2);
601  Kind = T1Class == T2Class ? CastAwayConstnessKind::CACK_SimilarKind
602  : CastAwayConstnessKind::CACK_Incoherent;
603  }
604 
605  // We've unwrapped at least one level. If the resulting T1 is a (possibly
606  // multidimensional) array type, any qualifier on any matching layer of
607  // T2 is considered to correspond to T1. Decompose down to the element
608  // type of T1 so that we can compare properly.
609  while (true) {
610  Context.UnwrapSimilarArrayTypes(T1, T2);
611 
612  if (Classify(T1) != Array)
613  break;
614 
615  auto T2Class = Classify(T2);
616  if (T2Class == None)
617  break;
618 
619  if (T2Class != Array)
620  Kind = CastAwayConstnessKind::CACK_Incoherent;
621  else if (Kind != CastAwayConstnessKind::CACK_Incoherent)
622  Kind = CastAwayConstnessKind::CACK_SimilarKind;
623 
624  T1 = Unwrap(T1);
625  T2 = Unwrap(T2).withCVRQualifiers(T2.getCVRQualifiers());
626  }
627 
628  return Kind;
629 }
630 
631 /// Check if the pointer conversion from SrcType to DestType casts away
632 /// constness as defined in C++ [expr.const.cast]. This is used by the cast
633 /// checkers. Both arguments must denote pointer (possibly to member) types.
634 ///
635 /// \param CheckCVR Whether to check for const/volatile/restrict qualifiers.
636 /// \param CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.
637 static CastAwayConstnessKind
638 CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType,
639  bool CheckCVR, bool CheckObjCLifetime,
640  QualType *TheOffendingSrcType = nullptr,
641  QualType *TheOffendingDestType = nullptr,
642  Qualifiers *CastAwayQualifiers = nullptr) {
643  // If the only checking we care about is for Objective-C lifetime qualifiers,
644  // and we're not in ObjC mode, there's nothing to check.
645  if (!CheckCVR && CheckObjCLifetime && !Self.Context.getLangOpts().ObjC)
646  return CastAwayConstnessKind::CACK_None;
647 
648  if (!DestType->isReferenceType()) {
649  assert((SrcType->isAnyPointerType() || SrcType->isMemberPointerType() ||
650  SrcType->isBlockPointerType()) &&
651  "Source type is not pointer or pointer to member.");
652  assert((DestType->isAnyPointerType() || DestType->isMemberPointerType() ||
653  DestType->isBlockPointerType()) &&
654  "Destination type is not pointer or pointer to member.");
655  }
656 
657  QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
658  UnwrappedDestType = Self.Context.getCanonicalType(DestType);
659 
660  // Find the qualifiers. We only care about cvr-qualifiers for the
661  // purpose of this check, because other qualifiers (address spaces,
662  // Objective-C GC, etc.) are part of the type's identity.
663  QualType PrevUnwrappedSrcType = UnwrappedSrcType;
664  QualType PrevUnwrappedDestType = UnwrappedDestType;
665  auto WorstKind = CastAwayConstnessKind::CACK_Similar;
666  bool AllConstSoFar = true;
667  while (auto Kind = unwrapCastAwayConstnessLevel(
668  Self.Context, UnwrappedSrcType, UnwrappedDestType)) {
669  // Track the worst kind of unwrap we needed to do before we found a
670  // problem.
671  if (Kind > WorstKind)
672  WorstKind = Kind;
673 
674  // Determine the relevant qualifiers at this level.
675  Qualifiers SrcQuals, DestQuals;
676  Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
677  Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
678 
679  // We do not meaningfully track object const-ness of Objective-C object
680  // types. Remove const from the source type if either the source or
681  // the destination is an Objective-C object type.
682  if (UnwrappedSrcType->isObjCObjectType() ||
683  UnwrappedDestType->isObjCObjectType())
684  SrcQuals.removeConst();
685 
686  if (CheckCVR) {
687  Qualifiers SrcCvrQuals =
689  Qualifiers DestCvrQuals =
691 
692  if (SrcCvrQuals != DestCvrQuals) {
693  if (CastAwayQualifiers)
694  *CastAwayQualifiers = SrcCvrQuals - DestCvrQuals;
695 
696  // If we removed a cvr-qualifier, this is casting away 'constness'.
697  if (!DestCvrQuals.compatiblyIncludes(SrcCvrQuals)) {
698  if (TheOffendingSrcType)
699  *TheOffendingSrcType = PrevUnwrappedSrcType;
700  if (TheOffendingDestType)
701  *TheOffendingDestType = PrevUnwrappedDestType;
702  return WorstKind;
703  }
704 
705  // If any prior level was not 'const', this is also casting away
706  // 'constness'. We noted the outermost type missing a 'const' already.
707  if (!AllConstSoFar)
708  return WorstKind;
709  }
710  }
711 
712  if (CheckObjCLifetime &&
713  !DestQuals.compatiblyIncludesObjCLifetime(SrcQuals))
714  return WorstKind;
715 
716  // If we found our first non-const-qualified type, this may be the place
717  // where things start to go wrong.
718  if (AllConstSoFar && !DestQuals.hasConst()) {
719  AllConstSoFar = false;
720  if (TheOffendingSrcType)
721  *TheOffendingSrcType = PrevUnwrappedSrcType;
722  if (TheOffendingDestType)
723  *TheOffendingDestType = PrevUnwrappedDestType;
724  }
725 
726  PrevUnwrappedSrcType = UnwrappedSrcType;
727  PrevUnwrappedDestType = UnwrappedDestType;
728  }
729 
730  return CastAwayConstnessKind::CACK_None;
731 }
732 
733 static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK,
734  unsigned &DiagID) {
735  switch (CACK) {
736  case CastAwayConstnessKind::CACK_None:
737  llvm_unreachable("did not cast away constness");
738 
739  case CastAwayConstnessKind::CACK_Similar:
740  // FIXME: Accept these as an extension too?
741  case CastAwayConstnessKind::CACK_SimilarKind:
742  DiagID = diag::err_bad_cxx_cast_qualifiers_away;
743  return TC_Failed;
744 
745  case CastAwayConstnessKind::CACK_Incoherent:
746  DiagID = diag::ext_bad_cxx_cast_qualifiers_away_incoherent;
747  return TC_Extension;
748  }
749 
750  llvm_unreachable("unexpected cast away constness kind");
751 }
752 
753 /// CheckDynamicCast - Check that a dynamic_cast<DestType>(SrcExpr) is valid.
754 /// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
755 /// checked downcasts in class hierarchies.
756 void CastOperation::CheckDynamicCast() {
757  CheckNoDerefRAII NoderefCheck(*this);
758 
759  if (ValueKind == VK_PRValue)
760  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
761  else if (isPlaceholder())
762  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
763  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
764  return;
765 
766  QualType OrigSrcType = SrcExpr.get()->getType();
767  QualType DestType = Self.Context.getCanonicalType(this->DestType);
768 
769  // C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
770  // or "pointer to cv void".
771 
772  QualType DestPointee;
773  const PointerType *DestPointer = DestType->getAs<PointerType>();
774  const ReferenceType *DestReference = nullptr;
775  if (DestPointer) {
776  DestPointee = DestPointer->getPointeeType();
777  } else if ((DestReference = DestType->getAs<ReferenceType>())) {
778  DestPointee = DestReference->getPointeeType();
779  } else {
780  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
781  << this->DestType << DestRange;
782  SrcExpr = ExprError();
783  return;
784  }
785 
786  const RecordType *DestRecord = DestPointee->getAs<RecordType>();
787  if (DestPointee->isVoidType()) {
788  assert(DestPointer && "Reference to void is not possible");
789  } else if (DestRecord) {
790  if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
791  diag::err_bad_cast_incomplete,
792  DestRange)) {
793  SrcExpr = ExprError();
794  return;
795  }
796  } else {
797  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
798  << DestPointee.getUnqualifiedType() << DestRange;
799  SrcExpr = ExprError();
800  return;
801  }
802 
803  // C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
804  // complete class type, [...]. If T is an lvalue reference type, v shall be
805  // an lvalue of a complete class type, [...]. If T is an rvalue reference
806  // type, v shall be an expression having a complete class type, [...]
807  QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
808  QualType SrcPointee;
809  if (DestPointer) {
810  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
811  SrcPointee = SrcPointer->getPointeeType();
812  } else {
813  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
814  << OrigSrcType << this->DestType << SrcExpr.get()->getSourceRange();
815  SrcExpr = ExprError();
816  return;
817  }
818  } else if (DestReference->isLValueReferenceType()) {
819  if (!SrcExpr.get()->isLValue()) {
820  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
821  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
822  }
823  SrcPointee = SrcType;
824  } else {
825  // If we're dynamic_casting from a prvalue to an rvalue reference, we need
826  // to materialize the prvalue before we bind the reference to it.
827  if (SrcExpr.get()->isPRValue())
828  SrcExpr = Self.CreateMaterializeTemporaryExpr(
829  SrcType, SrcExpr.get(), /*IsLValueReference*/ false);
830  SrcPointee = SrcType;
831  }
832 
833  const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
834  if (SrcRecord) {
835  if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
836  diag::err_bad_cast_incomplete,
837  SrcExpr.get())) {
838  SrcExpr = ExprError();
839  return;
840  }
841  } else {
842  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
843  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
844  SrcExpr = ExprError();
845  return;
846  }
847 
848  assert((DestPointer || DestReference) &&
849  "Bad destination non-ptr/ref slipped through.");
850  assert((DestRecord || DestPointee->isVoidType()) &&
851  "Bad destination pointee slipped through.");
852  assert(SrcRecord && "Bad source pointee slipped through.");
853 
854  // C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
855  if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
856  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_qualifiers_away)
857  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
858  SrcExpr = ExprError();
859  return;
860  }
861 
862  // C++ 5.2.7p3: If the type of v is the same as the required result type,
863  // [except for cv].
864  if (DestRecord == SrcRecord) {
865  Kind = CK_NoOp;
866  return;
867  }
868 
869  // C++ 5.2.7p5
870  // Upcasts are resolved statically.
871  if (DestRecord &&
872  Self.IsDerivedFrom(OpRange.getBegin(), SrcPointee, DestPointee)) {
873  if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
874  OpRange.getBegin(), OpRange,
875  &BasePath)) {
876  SrcExpr = ExprError();
877  return;
878  }
879 
880  Kind = CK_DerivedToBase;
881  return;
882  }
883 
884  // C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
885  const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
886  assert(SrcDecl && "Definition missing");
887  if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
888  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
889  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
890  SrcExpr = ExprError();
891  }
892 
893  // dynamic_cast is not available with -fno-rtti.
894  // As an exception, dynamic_cast to void* is available because it doesn't
895  // use RTTI.
896  if (!Self.getLangOpts().RTTI && !DestPointee->isVoidType()) {
897  Self.Diag(OpRange.getBegin(), diag::err_no_dynamic_cast_with_fno_rtti);
898  SrcExpr = ExprError();
899  return;
900  }
901 
902  // Warns when dynamic_cast is used with RTTI data disabled.
903  if (!Self.getLangOpts().RTTIData) {
904  bool MicrosoftABI =
905  Self.getASTContext().getTargetInfo().getCXXABI().isMicrosoft();
906  bool isClangCL = Self.getDiagnostics().getDiagnosticOptions().getFormat() ==
908  if (MicrosoftABI || !DestPointee->isVoidType())
909  Self.Diag(OpRange.getBegin(),
910  diag::warn_no_dynamic_cast_with_rtti_disabled)
911  << isClangCL;
912  }
913 
914  // Done. Everything else is run-time checks.
915  Kind = CK_Dynamic;
916 }
917 
918 /// CheckConstCast - Check that a const_cast<DestType>(SrcExpr) is valid.
919 /// Refer to C++ 5.2.11 for details. const_cast is typically used in code
920 /// like this:
921 /// const char *str = "literal";
922 /// legacy_function(const_cast<char*>(str));
923 void CastOperation::CheckConstCast() {
924  CheckNoDerefRAII NoderefCheck(*this);
925 
926  if (ValueKind == VK_PRValue)
927  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
928  else if (isPlaceholder())
929  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
930  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
931  return;
932 
933  unsigned msg = diag::err_bad_cxx_cast_generic;
934  auto TCR = TryConstCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg);
935  if (TCR != TC_Success && msg != 0) {
936  Self.Diag(OpRange.getBegin(), msg) << CT_Const
937  << SrcExpr.get()->getType() << DestType << OpRange;
938  }
939  if (!isValidCast(TCR))
940  SrcExpr = ExprError();
941 }
942 
943 void CastOperation::CheckAddrspaceCast() {
944  unsigned msg = diag::err_bad_cxx_cast_generic;
945  auto TCR =
946  TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg, Kind);
947  if (TCR != TC_Success && msg != 0) {
948  Self.Diag(OpRange.getBegin(), msg)
949  << CT_Addrspace << SrcExpr.get()->getType() << DestType << OpRange;
950  }
951  if (!isValidCast(TCR))
952  SrcExpr = ExprError();
953 }
954 
955 /// Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast
956 /// or downcast between respective pointers or references.
957 static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr,
958  QualType DestType,
959  SourceRange OpRange) {
960  QualType SrcType = SrcExpr->getType();
961  // When casting from pointer or reference, get pointee type; use original
962  // type otherwise.
963  const CXXRecordDecl *SrcPointeeRD = SrcType->getPointeeCXXRecordDecl();
964  const CXXRecordDecl *SrcRD =
965  SrcPointeeRD ? SrcPointeeRD : SrcType->getAsCXXRecordDecl();
966 
967  // Examining subobjects for records is only possible if the complete and
968  // valid definition is available. Also, template instantiation is not
969  // allowed here.
970  if (!SrcRD || !SrcRD->isCompleteDefinition() || SrcRD->isInvalidDecl())
971  return;
972 
973  const CXXRecordDecl *DestRD = DestType->getPointeeCXXRecordDecl();
974 
975  if (!DestRD || !DestRD->isCompleteDefinition() || DestRD->isInvalidDecl())
976  return;
977 
978  enum {
979  ReinterpretUpcast,
980  ReinterpretDowncast
981  } ReinterpretKind;
982 
983  CXXBasePaths BasePaths;
984 
985  if (SrcRD->isDerivedFrom(DestRD, BasePaths))
986  ReinterpretKind = ReinterpretUpcast;
987  else if (DestRD->isDerivedFrom(SrcRD, BasePaths))
988  ReinterpretKind = ReinterpretDowncast;
989  else
990  return;
991 
992  bool VirtualBase = true;
993  bool NonZeroOffset = false;
994  for (CXXBasePaths::const_paths_iterator I = BasePaths.begin(),
995  E = BasePaths.end();
996  I != E; ++I) {
997  const CXXBasePath &Path = *I;
999  bool IsVirtual = false;
1000  for (CXXBasePath::const_iterator IElem = Path.begin(), EElem = Path.end();
1001  IElem != EElem; ++IElem) {
1002  IsVirtual = IElem->Base->isVirtual();
1003  if (IsVirtual)
1004  break;
1005  const CXXRecordDecl *BaseRD = IElem->Base->getType()->getAsCXXRecordDecl();
1006  assert(BaseRD && "Base type should be a valid unqualified class type");
1007  // Don't check if any base has invalid declaration or has no definition
1008  // since it has no layout info.
1009  const CXXRecordDecl *Class = IElem->Class,
1010  *ClassDefinition = Class->getDefinition();
1011  if (Class->isInvalidDecl() || !ClassDefinition ||
1012  !ClassDefinition->isCompleteDefinition())
1013  return;
1014 
1015  const ASTRecordLayout &DerivedLayout =
1016  Self.Context.getASTRecordLayout(Class);
1017  Offset += DerivedLayout.getBaseClassOffset(BaseRD);
1018  }
1019  if (!IsVirtual) {
1020  // Don't warn if any path is a non-virtually derived base at offset zero.
1021  if (Offset.isZero())
1022  return;
1023  // Offset makes sense only for non-virtual bases.
1024  else
1025  NonZeroOffset = true;
1026  }
1027  VirtualBase = VirtualBase && IsVirtual;
1028  }
1029 
1030  (void) NonZeroOffset; // Silence set but not used warning.
1031  assert((VirtualBase || NonZeroOffset) &&
1032  "Should have returned if has non-virtual base with zero offset");
1033 
1034  QualType BaseType =
1035  ReinterpretKind == ReinterpretUpcast? DestType : SrcType;
1036  QualType DerivedType =
1037  ReinterpretKind == ReinterpretUpcast? SrcType : DestType;
1038 
1039  SourceLocation BeginLoc = OpRange.getBegin();
1040  Self.Diag(BeginLoc, diag::warn_reinterpret_different_from_static)
1041  << DerivedType << BaseType << !VirtualBase << int(ReinterpretKind)
1042  << OpRange;
1043  Self.Diag(BeginLoc, diag::note_reinterpret_updowncast_use_static)
1044  << int(ReinterpretKind)
1045  << FixItHint::CreateReplacement(BeginLoc, "static_cast");
1046 }
1047 
1048 static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType,
1049  ASTContext &Context) {
1050  if (SrcType->isPointerType() && DestType->isPointerType())
1051  return true;
1052 
1053  // Allow integral type mismatch if their size are equal.
1054  if (SrcType->isIntegralType(Context) && DestType->isIntegralType(Context))
1055  if (Context.getTypeInfoInChars(SrcType).Width ==
1056  Context.getTypeInfoInChars(DestType).Width)
1057  return true;
1058 
1059  return Context.hasSameUnqualifiedType(SrcType, DestType);
1060 }
1061 
1062 static bool checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr,
1063  QualType DestType) {
1064  if (Self.Diags.isIgnored(diag::warn_cast_function_type,
1065  SrcExpr.get()->getExprLoc()))
1066  return true;
1067 
1068  QualType SrcType = SrcExpr.get()->getType();
1069  const FunctionType *SrcFTy = nullptr;
1070  const FunctionType *DstFTy = nullptr;
1071  if (((SrcType->isBlockPointerType() || SrcType->isFunctionPointerType()) &&
1072  DestType->isFunctionPointerType()) ||
1073  (SrcType->isMemberFunctionPointerType() &&
1074  DestType->isMemberFunctionPointerType())) {
1075  SrcFTy = SrcType->getPointeeType()->castAs<FunctionType>();
1076  DstFTy = DestType->getPointeeType()->castAs<FunctionType>();
1077  } else if (SrcType->isFunctionType() && DestType->isFunctionReferenceType()) {
1078  SrcFTy = SrcType->castAs<FunctionType>();
1079  DstFTy = DestType.getNonReferenceType()->castAs<FunctionType>();
1080  } else {
1081  return true;
1082  }
1083  assert(SrcFTy && DstFTy);
1084 
1085  auto IsVoidVoid = [](const FunctionType *T) {
1086  if (!T->getReturnType()->isVoidType())
1087  return false;
1088  if (const auto *PT = T->getAs<FunctionProtoType>())
1089  return !PT->isVariadic() && PT->getNumParams() == 0;
1090  return false;
1091  };
1092 
1093  // Skip if either function type is void(*)(void)
1094  if (IsVoidVoid(SrcFTy) || IsVoidVoid(DstFTy))
1095  return true;
1096 
1097  // Check return type.
1098  if (!argTypeIsABIEquivalent(SrcFTy->getReturnType(), DstFTy->getReturnType(),
1099  Self.Context))
1100  return false;
1101 
1102  // Check if either has unspecified number of parameters
1103  if (SrcFTy->isFunctionNoProtoType() || DstFTy->isFunctionNoProtoType())
1104  return true;
1105 
1106  // Check parameter types.
1107 
1108  const auto *SrcFPTy = cast<FunctionProtoType>(SrcFTy);
1109  const auto *DstFPTy = cast<FunctionProtoType>(DstFTy);
1110 
1111  // In a cast involving function types with a variable argument list only the
1112  // types of initial arguments that are provided are considered.
1113  unsigned NumParams = SrcFPTy->getNumParams();
1114  unsigned DstNumParams = DstFPTy->getNumParams();
1115  if (NumParams > DstNumParams) {
1116  if (!DstFPTy->isVariadic())
1117  return false;
1118  NumParams = DstNumParams;
1119  } else if (NumParams < DstNumParams) {
1120  if (!SrcFPTy->isVariadic())
1121  return false;
1122  }
1123 
1124  for (unsigned i = 0; i < NumParams; ++i)
1125  if (!argTypeIsABIEquivalent(SrcFPTy->getParamType(i),
1126  DstFPTy->getParamType(i), Self.Context))
1127  return false;
1128 
1129  return true;
1130 }
1131 
1132 /// CheckReinterpretCast - Check that a reinterpret_cast<DestType>(SrcExpr) is
1133 /// valid.
1134 /// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
1135 /// like this:
1136 /// char *bytes = reinterpret_cast<char*>(int_ptr);
1137 void CastOperation::CheckReinterpretCast() {
1138  if (ValueKind == VK_PRValue && !isPlaceholder(BuiltinType::Overload))
1139  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1140  else
1141  checkNonOverloadPlaceholders();
1142  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1143  return;
1144 
1145  unsigned msg = diag::err_bad_cxx_cast_generic;
1146  TryCastResult tcr =
1147  TryReinterpretCast(Self, SrcExpr, DestType,
1148  /*CStyle*/false, OpRange, msg, Kind);
1149  if (tcr != TC_Success && msg != 0) {
1150  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1151  return;
1152  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1153  //FIXME: &f<int>; is overloaded and resolvable
1154  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
1155  << OverloadExpr::find(SrcExpr.get()).Expression->getName()
1156  << DestType << OpRange;
1157  Self.NoteAllOverloadCandidates(SrcExpr.get());
1158 
1159  } else {
1160  diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr.get(),
1161  DestType, /*listInitialization=*/false);
1162  }
1163  }
1164 
1165  if (isValidCast(tcr)) {
1166  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1167  checkObjCConversion(Sema::CCK_OtherCast);
1168  DiagnoseReinterpretUpDownCast(Self, SrcExpr.get(), DestType, OpRange);
1169 
1170  if (!checkCastFunctionType(Self, SrcExpr, DestType))
1171  Self.Diag(OpRange.getBegin(), diag::warn_cast_function_type)
1172  << SrcExpr.get()->getType() << DestType << OpRange;
1173  } else {
1174  SrcExpr = ExprError();
1175  }
1176 }
1177 
1178 
1179 /// CheckStaticCast - Check that a static_cast<DestType>(SrcExpr) is valid.
1180 /// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
1181 /// implicit conversions explicit and getting rid of data loss warnings.
1182 void CastOperation::CheckStaticCast() {
1183  CheckNoDerefRAII NoderefCheck(*this);
1184 
1185  if (isPlaceholder()) {
1186  checkNonOverloadPlaceholders();
1187  if (SrcExpr.isInvalid())
1188  return;
1189  }
1190 
1191  // This test is outside everything else because it's the only case where
1192  // a non-lvalue-reference target type does not lead to decay.
1193  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1194  if (DestType->isVoidType()) {
1195  Kind = CK_ToVoid;
1196 
1197  if (claimPlaceholder(BuiltinType::Overload)) {
1198  Self.ResolveAndFixSingleFunctionTemplateSpecialization(SrcExpr,
1199  false, // Decay Function to ptr
1200  true, // Complain
1201  OpRange, DestType, diag::err_bad_static_cast_overload);
1202  if (SrcExpr.isInvalid())
1203  return;
1204  }
1205 
1206  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
1207  return;
1208  }
1209 
1210  if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
1211  !isPlaceholder(BuiltinType::Overload)) {
1212  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1213  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1214  return;
1215  }
1216 
1217  unsigned msg = diag::err_bad_cxx_cast_generic;
1218  TryCastResult tcr
1219  = TryStaticCast(Self, SrcExpr, DestType, Sema::CCK_OtherCast, OpRange, msg,
1220  Kind, BasePath, /*ListInitialization=*/false);
1221  if (tcr != TC_Success && msg != 0) {
1222  if (SrcExpr.isInvalid())
1223  return;
1224  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1225  OverloadExpr* oe = OverloadExpr::find(SrcExpr.get()).Expression;
1226  Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
1227  << oe->getName() << DestType << OpRange
1228  << oe->getQualifierLoc().getSourceRange();
1229  Self.NoteAllOverloadCandidates(SrcExpr.get());
1230  } else {
1231  diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr.get(), DestType,
1232  /*listInitialization=*/false);
1233  }
1234  }
1235 
1236  if (isValidCast(tcr)) {
1237  if (Kind == CK_BitCast)
1238  checkCastAlign();
1239  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1240  checkObjCConversion(Sema::CCK_OtherCast);
1241  } else {
1242  SrcExpr = ExprError();
1243  }
1244 }
1245 
1246 static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType) {
1247  auto *SrcPtrType = SrcType->getAs<PointerType>();
1248  if (!SrcPtrType)
1249  return false;
1250  auto *DestPtrType = DestType->getAs<PointerType>();
1251  if (!DestPtrType)
1252  return false;
1253  return SrcPtrType->getPointeeType().getAddressSpace() !=
1254  DestPtrType->getPointeeType().getAddressSpace();
1255 }
1256 
1257 /// TryStaticCast - Check if a static cast can be performed, and do so if
1258 /// possible. If @p CStyle, ignore access restrictions on hierarchy casting
1259 /// and casting away constness.
1261  QualType DestType,
1263  SourceRange OpRange, unsigned &msg,
1264  CastKind &Kind, CXXCastPath &BasePath,
1265  bool ListInitialization) {
1266  // Determine whether we have the semantics of a C-style cast.
1267  bool CStyle
1268  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
1269 
1270  // The order the tests is not entirely arbitrary. There is one conversion
1271  // that can be handled in two different ways. Given:
1272  // struct A {};
1273  // struct B : public A {
1274  // B(); B(const A&);
1275  // };
1276  // const A &a = B();
1277  // the cast static_cast<const B&>(a) could be seen as either a static
1278  // reference downcast, or an explicit invocation of the user-defined
1279  // conversion using B's conversion constructor.
1280  // DR 427 specifies that the downcast is to be applied here.
1281 
1282  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1283  // Done outside this function.
1284 
1285  TryCastResult tcr;
1286 
1287  // C++ 5.2.9p5, reference downcast.
1288  // See the function for details.
1289  // DR 427 specifies that this is to be applied before paragraph 2.
1290  tcr = TryStaticReferenceDowncast(Self, SrcExpr.get(), DestType, CStyle,
1291  OpRange, msg, Kind, BasePath);
1292  if (tcr != TC_NotApplicable)
1293  return tcr;
1294 
1295  // C++11 [expr.static.cast]p3:
1296  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
1297  // T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1298  tcr = TryLValueToRValueCast(Self, SrcExpr.get(), DestType, CStyle, Kind,
1299  BasePath, msg);
1300  if (tcr != TC_NotApplicable)
1301  return tcr;
1302 
1303  // C++ 5.2.9p2: An expression e can be explicitly converted to a type T
1304  // [...] if the declaration "T t(e);" is well-formed, [...].
1305  tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CCK, OpRange, msg,
1306  Kind, ListInitialization);
1307  if (SrcExpr.isInvalid())
1308  return TC_Failed;
1309  if (tcr != TC_NotApplicable)
1310  return tcr;
1311 
1312  // C++ 5.2.9p6: May apply the reverse of any standard conversion, except
1313  // lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
1314  // conversions, subject to further restrictions.
1315  // Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
1316  // of qualification conversions impossible. (In C++20, adding an array bound
1317  // would be the reverse of a qualification conversion, but adding permission
1318  // to add an array bound in a static_cast is a wording oversight.)
1319  // In the CStyle case, the earlier attempt to const_cast should have taken
1320  // care of reverse qualification conversions.
1321 
1322  QualType SrcType = Self.Context.getCanonicalType(SrcExpr.get()->getType());
1323 
1324  // C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
1325  // converted to an integral type. [...] A value of a scoped enumeration type
1326  // can also be explicitly converted to a floating-point type [...].
1327  if (const EnumType *Enum = SrcType->getAs<EnumType>()) {
1328  if (Enum->getDecl()->isScoped()) {
1329  if (DestType->isBooleanType()) {
1330  Kind = CK_IntegralToBoolean;
1331  return TC_Success;
1332  } else if (DestType->isIntegralType(Self.Context)) {
1333  Kind = CK_IntegralCast;
1334  return TC_Success;
1335  } else if (DestType->isRealFloatingType()) {
1336  Kind = CK_IntegralToFloating;
1337  return TC_Success;
1338  }
1339  }
1340  }
1341 
1342  // Reverse integral promotion/conversion. All such conversions are themselves
1343  // again integral promotions or conversions and are thus already handled by
1344  // p2 (TryDirectInitialization above).
1345  // (Note: any data loss warnings should be suppressed.)
1346  // The exception is the reverse of enum->integer, i.e. integer->enum (and
1347  // enum->enum). See also C++ 5.2.9p7.
1348  // The same goes for reverse floating point promotion/conversion and
1349  // floating-integral conversions. Again, only floating->enum is relevant.
1350  if (DestType->isEnumeralType()) {
1351  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1352  diag::err_bad_cast_incomplete)) {
1353  SrcExpr = ExprError();
1354  return TC_Failed;
1355  }
1356  if (SrcType->isIntegralOrEnumerationType()) {
1357  // [expr.static.cast]p10 If the enumeration type has a fixed underlying
1358  // type, the value is first converted to that type by integral conversion
1359  const EnumType *Enum = DestType->getAs<EnumType>();
1360  Kind = Enum->getDecl()->isFixed() &&
1361  Enum->getDecl()->getIntegerType()->isBooleanType()
1362  ? CK_IntegralToBoolean
1363  : CK_IntegralCast;
1364  return TC_Success;
1365  } else if (SrcType->isRealFloatingType()) {
1366  Kind = CK_FloatingToIntegral;
1367  return TC_Success;
1368  }
1369  }
1370 
1371  // Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
1372  // C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
1373  tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
1374  Kind, BasePath);
1375  if (tcr != TC_NotApplicable)
1376  return tcr;
1377 
1378  // Reverse member pointer conversion. C++ 4.11 specifies member pointer
1379  // conversion. C++ 5.2.9p9 has additional information.
1380  // DR54's access restrictions apply here also.
1381  tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
1382  OpRange, msg, Kind, BasePath);
1383  if (tcr != TC_NotApplicable)
1384  return tcr;
1385 
1386  // Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
1387  // void*. C++ 5.2.9p10 specifies additional restrictions, which really is
1388  // just the usual constness stuff.
1389  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
1390  QualType SrcPointee = SrcPointer->getPointeeType();
1391  if (SrcPointee->isVoidType()) {
1392  if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
1393  QualType DestPointee = DestPointer->getPointeeType();
1394  if (DestPointee->isIncompleteOrObjectType()) {
1395  // This is definitely the intended conversion, but it might fail due
1396  // to a qualifier violation. Note that we permit Objective-C lifetime
1397  // and GC qualifier mismatches here.
1398  if (!CStyle) {
1399  Qualifiers DestPointeeQuals = DestPointee.getQualifiers();
1400  Qualifiers SrcPointeeQuals = SrcPointee.getQualifiers();
1401  DestPointeeQuals.removeObjCGCAttr();
1402  DestPointeeQuals.removeObjCLifetime();
1403  SrcPointeeQuals.removeObjCGCAttr();
1404  SrcPointeeQuals.removeObjCLifetime();
1405  if (DestPointeeQuals != SrcPointeeQuals &&
1406  !DestPointeeQuals.compatiblyIncludes(SrcPointeeQuals)) {
1407  msg = diag::err_bad_cxx_cast_qualifiers_away;
1408  return TC_Failed;
1409  }
1410  }
1411  Kind = IsAddressSpaceConversion(SrcType, DestType)
1412  ? CK_AddressSpaceConversion
1413  : CK_BitCast;
1414  return TC_Success;
1415  }
1416 
1417  // Microsoft permits static_cast from 'pointer-to-void' to
1418  // 'pointer-to-function'.
1419  if (!CStyle && Self.getLangOpts().MSVCCompat &&
1420  DestPointee->isFunctionType()) {
1421  Self.Diag(OpRange.getBegin(), diag::ext_ms_cast_fn_obj) << OpRange;
1422  Kind = CK_BitCast;
1423  return TC_Success;
1424  }
1425  }
1426  else if (DestType->isObjCObjectPointerType()) {
1427  // allow both c-style cast and static_cast of objective-c pointers as
1428  // they are pervasive.
1429  Kind = CK_CPointerToObjCPointerCast;
1430  return TC_Success;
1431  }
1432  else if (CStyle && DestType->isBlockPointerType()) {
1433  // allow c-style cast of void * to block pointers.
1434  Kind = CK_AnyPointerToBlockPointerCast;
1435  return TC_Success;
1436  }
1437  }
1438  }
1439  // Allow arbitrary objective-c pointer conversion with static casts.
1440  if (SrcType->isObjCObjectPointerType() &&
1441  DestType->isObjCObjectPointerType()) {
1442  Kind = CK_BitCast;
1443  return TC_Success;
1444  }
1445  // Allow ns-pointer to cf-pointer conversion in either direction
1446  // with static casts.
1447  if (!CStyle &&
1448  Self.CheckTollFreeBridgeStaticCast(DestType, SrcExpr.get(), Kind))
1449  return TC_Success;
1450 
1451  // See if it looks like the user is trying to convert between
1452  // related record types, and select a better diagnostic if so.
1453  if (auto SrcPointer = SrcType->getAs<PointerType>())
1454  if (auto DestPointer = DestType->getAs<PointerType>())
1455  if (SrcPointer->getPointeeType()->getAs<RecordType>() &&
1456  DestPointer->getPointeeType()->getAs<RecordType>())
1457  msg = diag::err_bad_cxx_cast_unrelated_class;
1458 
1459  if (SrcType->isMatrixType() && DestType->isMatrixType()) {
1460  if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind)) {
1461  SrcExpr = ExprError();
1462  return TC_Failed;
1463  }
1464  return TC_Success;
1465  }
1466 
1467  // We tried everything. Everything! Nothing works! :-(
1468  return TC_NotApplicable;
1469 }
1470 
1471 /// Tests whether a conversion according to N2844 is valid.
1473  QualType DestType, bool CStyle,
1474  CastKind &Kind, CXXCastPath &BasePath,
1475  unsigned &msg) {
1476  // C++11 [expr.static.cast]p3:
1477  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
1478  // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1479  const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
1480  if (!R)
1481  return TC_NotApplicable;
1482 
1483  if (!SrcExpr->isGLValue())
1484  return TC_NotApplicable;
1485 
1486  // Because we try the reference downcast before this function, from now on
1487  // this is the only cast possibility, so we issue an error if we fail now.
1488  // FIXME: Should allow casting away constness if CStyle.
1489  QualType FromType = SrcExpr->getType();
1490  QualType ToType = R->getPointeeType();
1491  if (CStyle) {
1492  FromType = FromType.getUnqualifiedType();
1493  ToType = ToType.getUnqualifiedType();
1494  }
1495 
1498  SrcExpr->getBeginLoc(), ToType, FromType, &RefConv);
1499  if (RefResult != Sema::Ref_Compatible) {
1500  if (CStyle || RefResult == Sema::Ref_Incompatible)
1501  return TC_NotApplicable;
1502  // Diagnose types which are reference-related but not compatible here since
1503  // we can provide better diagnostics. In these cases forwarding to
1504  // [expr.static.cast]p4 should never result in a well-formed cast.
1505  msg = SrcExpr->isLValue() ? diag::err_bad_lvalue_to_rvalue_cast
1506  : diag::err_bad_rvalue_to_rvalue_cast;
1507  return TC_Failed;
1508  }
1509 
1510  if (RefConv & Sema::ReferenceConversions::DerivedToBase) {
1511  Kind = CK_DerivedToBase;
1512  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1513  /*DetectVirtual=*/true);
1514  if (!Self.IsDerivedFrom(SrcExpr->getBeginLoc(), SrcExpr->getType(),
1515  R->getPointeeType(), Paths))
1516  return TC_NotApplicable;
1517 
1518  Self.BuildBasePathArray(Paths, BasePath);
1519  } else
1520  Kind = CK_NoOp;
1521 
1522  return TC_Success;
1523 }
1524 
1525 /// Tests whether a conversion according to C++ 5.2.9p5 is valid.
1527 TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
1528  bool CStyle, SourceRange OpRange,
1529  unsigned &msg, CastKind &Kind,
1530  CXXCastPath &BasePath) {
1531  // C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
1532  // cast to type "reference to cv2 D", where D is a class derived from B,
1533  // if a valid standard conversion from "pointer to D" to "pointer to B"
1534  // exists, cv2 >= cv1, and B is not a virtual base class of D.
1535  // In addition, DR54 clarifies that the base must be accessible in the
1536  // current context. Although the wording of DR54 only applies to the pointer
1537  // variant of this rule, the intent is clearly for it to apply to the this
1538  // conversion as well.
1539 
1540  const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
1541  if (!DestReference) {
1542  return TC_NotApplicable;
1543  }
1544  bool RValueRef = DestReference->isRValueReferenceType();
1545  if (!RValueRef && !SrcExpr->isLValue()) {
1546  // We know the left side is an lvalue reference, so we can suggest a reason.
1547  msg = diag::err_bad_cxx_cast_rvalue;
1548  return TC_NotApplicable;
1549  }
1550 
1551  QualType DestPointee = DestReference->getPointeeType();
1552 
1553  // FIXME: If the source is a prvalue, we should issue a warning (because the
1554  // cast always has undefined behavior), and for AST consistency, we should
1555  // materialize a temporary.
1556  return TryStaticDowncast(Self,
1557  Self.Context.getCanonicalType(SrcExpr->getType()),
1558  Self.Context.getCanonicalType(DestPointee), CStyle,
1559  OpRange, SrcExpr->getType(), DestType, msg, Kind,
1560  BasePath);
1561 }
1562 
1563 /// Tests whether a conversion according to C++ 5.2.9p8 is valid.
1566  bool CStyle, SourceRange OpRange,
1567  unsigned &msg, CastKind &Kind,
1568  CXXCastPath &BasePath) {
1569  // C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
1570  // type, can be converted to an rvalue of type "pointer to cv2 D", where D
1571  // is a class derived from B, if a valid standard conversion from "pointer
1572  // to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
1573  // class of D.
1574  // In addition, DR54 clarifies that the base must be accessible in the
1575  // current context.
1576 
1577  const PointerType *DestPointer = DestType->getAs<PointerType>();
1578  if (!DestPointer) {
1579  return TC_NotApplicable;
1580  }
1581 
1582  const PointerType *SrcPointer = SrcType->getAs<PointerType>();
1583  if (!SrcPointer) {
1584  msg = diag::err_bad_static_cast_pointer_nonpointer;
1585  return TC_NotApplicable;
1586  }
1587 
1588  return TryStaticDowncast(Self,
1589  Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
1590  Self.Context.getCanonicalType(DestPointer->getPointeeType()),
1591  CStyle, OpRange, SrcType, DestType, msg, Kind,
1592  BasePath);
1593 }
1594 
1595 /// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
1596 /// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
1597 /// DestType is possible and allowed.
1600  bool CStyle, SourceRange OpRange, QualType OrigSrcType,
1601  QualType OrigDestType, unsigned &msg,
1602  CastKind &Kind, CXXCastPath &BasePath) {
1603  // We can only work with complete types. But don't complain if it doesn't work
1604  if (!Self.isCompleteType(OpRange.getBegin(), SrcType) ||
1605  !Self.isCompleteType(OpRange.getBegin(), DestType))
1606  return TC_NotApplicable;
1607 
1608  // Downcast can only happen in class hierarchies, so we need classes.
1609  if (!DestType->getAs<RecordType>() || !SrcType->getAs<RecordType>()) {
1610  return TC_NotApplicable;
1611  }
1612 
1613  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1614  /*DetectVirtual=*/true);
1615  if (!Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths)) {
1616  return TC_NotApplicable;
1617  }
1618 
1619  // Target type does derive from source type. Now we're serious. If an error
1620  // appears now, it's not ignored.
1621  // This may not be entirely in line with the standard. Take for example:
1622  // struct A {};
1623  // struct B : virtual A {
1624  // B(A&);
1625  // };
1626  //
1627  // void f()
1628  // {
1629  // (void)static_cast<const B&>(*((A*)0));
1630  // }
1631  // As far as the standard is concerned, p5 does not apply (A is virtual), so
1632  // p2 should be used instead - "const B& t(*((A*)0));" is perfectly valid.
1633  // However, both GCC and Comeau reject this example, and accepting it would
1634  // mean more complex code if we're to preserve the nice error message.
1635  // FIXME: Being 100% compliant here would be nice to have.
1636 
1637  // Must preserve cv, as always, unless we're in C-style mode.
1638  if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
1639  msg = diag::err_bad_cxx_cast_qualifiers_away;
1640  return TC_Failed;
1641  }
1642 
1643  if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
1644  // This code is analoguous to that in CheckDerivedToBaseConversion, except
1645  // that it builds the paths in reverse order.
1646  // To sum up: record all paths to the base and build a nice string from
1647  // them. Use it to spice up the error message.
1648  if (!Paths.isRecordingPaths()) {
1649  Paths.clear();
1650  Paths.setRecordingPaths(true);
1651  Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths);
1652  }
1653  std::string PathDisplayStr;
1654  std::set<unsigned> DisplayedPaths;
1655  for (clang::CXXBasePath &Path : Paths) {
1656  if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
1657  // We haven't displayed a path to this particular base
1658  // class subobject yet.
1659  PathDisplayStr += "\n ";
1660  for (CXXBasePathElement &PE : llvm::reverse(Path))
1661  PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
1662  PathDisplayStr += QualType(DestType).getAsString();
1663  }
1664  }
1665 
1666  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
1667  << QualType(SrcType).getUnqualifiedType()
1668  << QualType(DestType).getUnqualifiedType()
1669  << PathDisplayStr << OpRange;
1670  msg = 0;
1671  return TC_Failed;
1672  }
1673 
1674  if (Paths.getDetectedVirtual() != nullptr) {
1675  QualType VirtualBase(Paths.getDetectedVirtual(), 0);
1676  Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
1677  << OrigSrcType << OrigDestType << VirtualBase << OpRange;
1678  msg = 0;
1679  return TC_Failed;
1680  }
1681 
1682  if (!CStyle) {
1683  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1684  SrcType, DestType,
1685  Paths.front(),
1686  diag::err_downcast_from_inaccessible_base)) {
1687  case Sema::AR_accessible:
1688  case Sema::AR_delayed: // be optimistic
1689  case Sema::AR_dependent: // be optimistic
1690  break;
1691 
1692  case Sema::AR_inaccessible:
1693  msg = 0;
1694  return TC_Failed;
1695  }
1696  }
1697 
1698  Self.BuildBasePathArray(Paths, BasePath);
1699  Kind = CK_BaseToDerived;
1700  return TC_Success;
1701 }
1702 
1703 /// TryStaticMemberPointerUpcast - Tests whether a conversion according to
1704 /// C++ 5.2.9p9 is valid:
1705 ///
1706 /// An rvalue of type "pointer to member of D of type cv1 T" can be
1707 /// converted to an rvalue of type "pointer to member of B of type cv2 T",
1708 /// where B is a base class of D [...].
1709 ///
1712  QualType DestType, bool CStyle,
1713  SourceRange OpRange,
1714  unsigned &msg, CastKind &Kind,
1715  CXXCastPath &BasePath) {
1716  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
1717  if (!DestMemPtr)
1718  return TC_NotApplicable;
1719 
1720  bool WasOverloadedFunction = false;
1721  DeclAccessPair FoundOverload;
1722  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1723  if (FunctionDecl *Fn
1724  = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(), DestType, false,
1725  FoundOverload)) {
1726  CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
1727  SrcType = Self.Context.getMemberPointerType(Fn->getType(),
1729  WasOverloadedFunction = true;
1730  }
1731  }
1732 
1733  const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1734  if (!SrcMemPtr) {
1735  msg = diag::err_bad_static_cast_member_pointer_nonmp;
1736  return TC_NotApplicable;
1737  }
1738 
1739  // Lock down the inheritance model right now in MS ABI, whether or not the
1740  // pointee types are the same.
1741  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1742  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
1743  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
1744  }
1745 
1746  // T == T, modulo cv
1747  if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
1748  DestMemPtr->getPointeeType()))
1749  return TC_NotApplicable;
1750 
1751  // B base of D
1752  QualType SrcClass(SrcMemPtr->getClass(), 0);
1753  QualType DestClass(DestMemPtr->getClass(), 0);
1754  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1755  /*DetectVirtual=*/true);
1756  if (!Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths))
1757  return TC_NotApplicable;
1758 
1759  // B is a base of D. But is it an allowed base? If not, it's a hard error.
1760  if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
1761  Paths.clear();
1762  Paths.setRecordingPaths(true);
1763  bool StillOkay =
1764  Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths);
1765  assert(StillOkay);
1766  (void)StillOkay;
1767  std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
1768  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
1769  << 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
1770  msg = 0;
1771  return TC_Failed;
1772  }
1773 
1774  if (const RecordType *VBase = Paths.getDetectedVirtual()) {
1775  Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
1776  << SrcClass << DestClass << QualType(VBase, 0) << OpRange;
1777  msg = 0;
1778  return TC_Failed;
1779  }
1780 
1781  if (!CStyle) {
1782  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1783  DestClass, SrcClass,
1784  Paths.front(),
1785  diag::err_upcast_to_inaccessible_base)) {
1786  case Sema::AR_accessible:
1787  case Sema::AR_delayed:
1788  case Sema::AR_dependent:
1789  // Optimistically assume that the delayed and dependent cases
1790  // will work out.
1791  break;
1792 
1793  case Sema::AR_inaccessible:
1794  msg = 0;
1795  return TC_Failed;
1796  }
1797  }
1798 
1799  if (WasOverloadedFunction) {
1800  // Resolve the address of the overloaded function again, this time
1801  // allowing complaints if something goes wrong.
1803  DestType,
1804  true,
1805  FoundOverload);
1806  if (!Fn) {
1807  msg = 0;
1808  return TC_Failed;
1809  }
1810 
1811  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
1812  if (!SrcExpr.isUsable()) {
1813  msg = 0;
1814  return TC_Failed;
1815  }
1816  }
1817 
1818  Self.BuildBasePathArray(Paths, BasePath);
1819  Kind = CK_DerivedToBaseMemberPointer;
1820  return TC_Success;
1821 }
1822 
1823 /// TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2
1824 /// is valid:
1825 ///
1826 /// An expression e can be explicitly converted to a type T using a
1827 /// @c static_cast if the declaration "T t(e);" is well-formed [...].
1829 TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr, QualType DestType,
1831  SourceRange OpRange, unsigned &msg,
1832  CastKind &Kind, bool ListInitialization) {
1833  if (DestType->isRecordType()) {
1834  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1835  diag::err_bad_cast_incomplete) ||
1836  Self.RequireNonAbstractType(OpRange.getBegin(), DestType,
1837  diag::err_allocation_of_abstract_type)) {
1838  msg = 0;
1839  return TC_Failed;
1840  }
1841  }
1842 
1844  InitializationKind InitKind
1845  = (CCK == Sema::CCK_CStyleCast)
1846  ? InitializationKind::CreateCStyleCast(OpRange.getBegin(), OpRange,
1847  ListInitialization)
1848  : (CCK == Sema::CCK_FunctionalCast)
1849  ? InitializationKind::CreateFunctionalCast(OpRange, ListInitialization)
1850  : InitializationKind::CreateCast(OpRange);
1851  Expr *SrcExprRaw = SrcExpr.get();
1852  // FIXME: Per DR242, we should check for an implicit conversion sequence
1853  // or for a constructor that could be invoked by direct-initialization
1854  // here, not for an initialization sequence.
1855  InitializationSequence InitSeq(Self, Entity, InitKind, SrcExprRaw);
1856 
1857  // At this point of CheckStaticCast, if the destination is a reference,
1858  // or the expression is an overload expression this has to work.
1859  // There is no other way that works.
1860  // On the other hand, if we're checking a C-style cast, we've still got
1861  // the reinterpret_cast way.
1862  bool CStyle
1863  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
1864  if (InitSeq.Failed() && (CStyle || !DestType->isReferenceType()))
1865  return TC_NotApplicable;
1866 
1867  ExprResult Result = InitSeq.Perform(Self, Entity, InitKind, SrcExprRaw);
1868  if (Result.isInvalid()) {
1869  msg = 0;
1870  return TC_Failed;
1871  }
1872 
1873  if (InitSeq.isConstructorInitialization())
1874  Kind = CK_ConstructorConversion;
1875  else
1876  Kind = CK_NoOp;
1877 
1878  SrcExpr = Result;
1879  return TC_Success;
1880 }
1881 
1882 /// TryConstCast - See if a const_cast from source to destination is allowed,
1883 /// and perform it if it is.
1885  QualType DestType, bool CStyle,
1886  unsigned &msg) {
1887  DestType = Self.Context.getCanonicalType(DestType);
1888  QualType SrcType = SrcExpr.get()->getType();
1889  bool NeedToMaterializeTemporary = false;
1890 
1891  if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
1892  // C++11 5.2.11p4:
1893  // if a pointer to T1 can be explicitly converted to the type "pointer to
1894  // T2" using a const_cast, then the following conversions can also be
1895  // made:
1896  // -- an lvalue of type T1 can be explicitly converted to an lvalue of
1897  // type T2 using the cast const_cast<T2&>;
1898  // -- a glvalue of type T1 can be explicitly converted to an xvalue of
1899  // type T2 using the cast const_cast<T2&&>; and
1900  // -- if T1 is a class type, a prvalue of type T1 can be explicitly
1901  // converted to an xvalue of type T2 using the cast const_cast<T2&&>.
1902 
1903  if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr.get()->isLValue()) {
1904  // Cannot const_cast non-lvalue to lvalue reference type. But if this
1905  // is C-style, static_cast might find a way, so we simply suggest a
1906  // message and tell the parent to keep searching.
1907  msg = diag::err_bad_cxx_cast_rvalue;
1908  return TC_NotApplicable;
1909  }
1910 
1911  if (isa<RValueReferenceType>(DestTypeTmp) && SrcExpr.get()->isPRValue()) {
1912  if (!SrcType->isRecordType()) {
1913  // Cannot const_cast non-class prvalue to rvalue reference type. But if
1914  // this is C-style, static_cast can do this.
1915  msg = diag::err_bad_cxx_cast_rvalue;
1916  return TC_NotApplicable;
1917  }
1918 
1919  // Materialize the class prvalue so that the const_cast can bind a
1920  // reference to it.
1921  NeedToMaterializeTemporary = true;
1922  }
1923 
1924  // It's not completely clear under the standard whether we can
1925  // const_cast bit-field gl-values. Doing so would not be
1926  // intrinsically complicated, but for now, we say no for
1927  // consistency with other compilers and await the word of the
1928  // committee.
1929  if (SrcExpr.get()->refersToBitField()) {
1930  msg = diag::err_bad_cxx_cast_bitfield;
1931  return TC_NotApplicable;
1932  }
1933 
1934  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1935  SrcType = Self.Context.getPointerType(SrcType);
1936  }
1937 
1938  // C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
1939  // the rules for const_cast are the same as those used for pointers.
1940 
1941  if (!DestType->isPointerType() &&
1942  !DestType->isMemberPointerType() &&
1943  !DestType->isObjCObjectPointerType()) {
1944  // Cannot cast to non-pointer, non-reference type. Note that, if DestType
1945  // was a reference type, we converted it to a pointer above.
1946  // The status of rvalue references isn't entirely clear, but it looks like
1947  // conversion to them is simply invalid.
1948  // C++ 5.2.11p3: For two pointer types [...]
1949  if (!CStyle)
1950  msg = diag::err_bad_const_cast_dest;
1951  return TC_NotApplicable;
1952  }
1953  if (DestType->isFunctionPointerType() ||
1954  DestType->isMemberFunctionPointerType()) {
1955  // Cannot cast direct function pointers.
1956  // C++ 5.2.11p2: [...] where T is any object type or the void type [...]
1957  // T is the ultimate pointee of source and target type.
1958  if (!CStyle)
1959  msg = diag::err_bad_const_cast_dest;
1960  return TC_NotApplicable;
1961  }
1962 
1963  // C++ [expr.const.cast]p3:
1964  // "For two similar types T1 and T2, [...]"
1965  //
1966  // We only allow a const_cast to change cvr-qualifiers, not other kinds of
1967  // type qualifiers. (Likewise, we ignore other changes when determining
1968  // whether a cast casts away constness.)
1969  if (!Self.Context.hasCvrSimilarType(SrcType, DestType))
1970  return TC_NotApplicable;
1971 
1972  if (NeedToMaterializeTemporary)
1973  // This is a const_cast from a class prvalue to an rvalue reference type.
1974  // Materialize a temporary to store the result of the conversion.
1975  SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcExpr.get()->getType(),
1976  SrcExpr.get(),
1977  /*IsLValueReference*/ false);
1978 
1979  return TC_Success;
1980 }
1981 
1982 // Checks for undefined behavior in reinterpret_cast.
1983 // The cases that is checked for is:
1984 // *reinterpret_cast<T*>(&a)
1985 // reinterpret_cast<T&>(a)
1986 // where accessing 'a' as type 'T' will result in undefined behavior.
1988  bool IsDereference,
1989  SourceRange Range) {
1990  unsigned DiagID = IsDereference ?
1991  diag::warn_pointer_indirection_from_incompatible_type :
1992  diag::warn_undefined_reinterpret_cast;
1993 
1994  if (Diags.isIgnored(DiagID, Range.getBegin()))
1995  return;
1996 
1997  QualType SrcTy, DestTy;
1998  if (IsDereference) {
1999  if (!SrcType->getAs<PointerType>() || !DestType->getAs<PointerType>()) {
2000  return;
2001  }
2002  SrcTy = SrcType->getPointeeType();
2003  DestTy = DestType->getPointeeType();
2004  } else {
2005  if (!DestType->getAs<ReferenceType>()) {
2006  return;
2007  }
2008  SrcTy = SrcType;
2009  DestTy = DestType->getPointeeType();
2010  }
2011 
2012  // Cast is compatible if the types are the same.
2013  if (Context.hasSameUnqualifiedType(DestTy, SrcTy)) {
2014  return;
2015  }
2016  // or one of the types is a char or void type
2017  if (DestTy->isAnyCharacterType() || DestTy->isVoidType() ||
2018  SrcTy->isAnyCharacterType() || SrcTy->isVoidType()) {
2019  return;
2020  }
2021  // or one of the types is a tag type.
2022  if (SrcTy->getAs<TagType>() || DestTy->getAs<TagType>()) {
2023  return;
2024  }
2025 
2026  // FIXME: Scoped enums?
2027  if ((SrcTy->isUnsignedIntegerType() && DestTy->isSignedIntegerType()) ||
2028  (SrcTy->isSignedIntegerType() && DestTy->isUnsignedIntegerType())) {
2029  if (Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) {
2030  return;
2031  }
2032  }
2033 
2034  Diag(Range.getBegin(), DiagID) << SrcType << DestType << Range;
2035 }
2036 
2037 static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr,
2038  QualType DestType) {
2039  QualType SrcType = SrcExpr.get()->getType();
2040  if (Self.Context.hasSameType(SrcType, DestType))
2041  return;
2042  if (const PointerType *SrcPtrTy = SrcType->getAs<PointerType>())
2043  if (SrcPtrTy->isObjCSelType()) {
2044  QualType DT = DestType;
2045  if (isa<PointerType>(DestType))
2046  DT = DestType->getPointeeType();
2047  if (!DT.getUnqualifiedType()->isVoidType())
2048  Self.Diag(SrcExpr.get()->getExprLoc(),
2049  diag::warn_cast_pointer_from_sel)
2050  << SrcType << DestType << SrcExpr.get()->getSourceRange();
2051  }
2052 }
2053 
2054 /// Diagnose casts that change the calling convention of a pointer to a function
2055 /// defined in the current TU.
2056 static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr,
2057  QualType DstType, SourceRange OpRange) {
2058  // Check if this cast would change the calling convention of a function
2059  // pointer type.
2060  QualType SrcType = SrcExpr.get()->getType();
2061  if (Self.Context.hasSameType(SrcType, DstType) ||
2062  !SrcType->isFunctionPointerType() || !DstType->isFunctionPointerType())
2063  return;
2064  const auto *SrcFTy =
2065  SrcType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2066  const auto *DstFTy =
2067  DstType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2068  CallingConv SrcCC = SrcFTy->getCallConv();
2069  CallingConv DstCC = DstFTy->getCallConv();
2070  if (SrcCC == DstCC)
2071  return;
2072 
2073  // We have a calling convention cast. Check if the source is a pointer to a
2074  // known, specific function that has already been defined.
2075  Expr *Src = SrcExpr.get()->IgnoreParenImpCasts();
2076  if (auto *UO = dyn_cast<UnaryOperator>(Src))
2077  if (UO->getOpcode() == UO_AddrOf)
2078  Src = UO->getSubExpr()->IgnoreParenImpCasts();
2079  auto *DRE = dyn_cast<DeclRefExpr>(Src);
2080  if (!DRE)
2081  return;
2082  auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
2083  if (!FD)
2084  return;
2085 
2086  // Only warn if we are casting from the default convention to a non-default
2087  // convention. This can happen when the programmer forgot to apply the calling
2088  // convention to the function declaration and then inserted this cast to
2089  // satisfy the type system.
2091  FD->isVariadic(), FD->isCXXInstanceMember());
2092  if (DstCC == DefaultCC || SrcCC != DefaultCC)
2093  return;
2094 
2095  // Diagnose this cast, as it is probably bad.
2096  StringRef SrcCCName = FunctionType::getNameForCallConv(SrcCC);
2097  StringRef DstCCName = FunctionType::getNameForCallConv(DstCC);
2098  Self.Diag(OpRange.getBegin(), diag::warn_cast_calling_conv)
2099  << SrcCCName << DstCCName << OpRange;
2100 
2101  // The checks above are cheaper than checking if the diagnostic is enabled.
2102  // However, it's worth checking if the warning is enabled before we construct
2103  // a fixit.
2104  if (Self.Diags.isIgnored(diag::warn_cast_calling_conv, OpRange.getBegin()))
2105  return;
2106 
2107  // Try to suggest a fixit to change the calling convention of the function
2108  // whose address was taken. Try to use the latest macro for the convention.
2109  // For example, users probably want to write "WINAPI" instead of "__stdcall"
2110  // to match the Windows header declarations.
2111  SourceLocation NameLoc = FD->getFirstDecl()->getNameInfo().getLoc();
2112  Preprocessor &PP = Self.getPreprocessor();
2113  SmallVector<TokenValue, 6> AttrTokens;
2114  SmallString<64> CCAttrText;
2115  llvm::raw_svector_ostream OS(CCAttrText);
2116  if (Self.getLangOpts().MicrosoftExt) {
2117  // __stdcall or __vectorcall
2118  OS << "__" << DstCCName;
2119  IdentifierInfo *II = PP.getIdentifierInfo(OS.str());
2120  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2121  ? TokenValue(II->getTokenID())
2122  : TokenValue(II));
2123  } else {
2124  // __attribute__((stdcall)) or __attribute__((vectorcall))
2125  OS << "__attribute__((" << DstCCName << "))";
2126  AttrTokens.push_back(tok::kw___attribute);
2127  AttrTokens.push_back(tok::l_paren);
2128  AttrTokens.push_back(tok::l_paren);
2129  IdentifierInfo *II = PP.getIdentifierInfo(DstCCName);
2130  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2131  ? TokenValue(II->getTokenID())
2132  : TokenValue(II));
2133  AttrTokens.push_back(tok::r_paren);
2134  AttrTokens.push_back(tok::r_paren);
2135  }
2136  StringRef AttrSpelling = PP.getLastMacroWithSpelling(NameLoc, AttrTokens);
2137  if (!AttrSpelling.empty())
2138  CCAttrText = AttrSpelling;
2139  OS << ' ';
2140  Self.Diag(NameLoc, diag::note_change_calling_conv_fixit)
2141  << FD << DstCCName << FixItHint::CreateInsertion(NameLoc, CCAttrText);
2142 }
2143 
2144 static void checkIntToPointerCast(bool CStyle, const SourceRange &OpRange,
2145  const Expr *SrcExpr, QualType DestType,
2146  Sema &Self) {
2147  QualType SrcType = SrcExpr->getType();
2148 
2149  // Not warning on reinterpret_cast, boolean, constant expressions, etc
2150  // are not explicit design choices, but consistent with GCC's behavior.
2151  // Feel free to modify them if you've reason/evidence for an alternative.
2152  if (CStyle && SrcType->isIntegralType(Self.Context)
2153  && !SrcType->isBooleanType()
2154  && !SrcType->isEnumeralType()
2155  && !SrcExpr->isIntegerConstantExpr(Self.Context)
2156  && Self.Context.getTypeSize(DestType) >
2157  Self.Context.getTypeSize(SrcType)) {
2158  // Separate between casts to void* and non-void* pointers.
2159  // Some APIs use (abuse) void* for something like a user context,
2160  // and often that value is an integer even if it isn't a pointer itself.
2161  // Having a separate warning flag allows users to control the warning
2162  // for their workflow.
2163  unsigned Diag = DestType->isVoidPointerType() ?
2164  diag::warn_int_to_void_pointer_cast
2165  : diag::warn_int_to_pointer_cast;
2166  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2167  }
2168 }
2169 
2170 static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType,
2171  ExprResult &Result) {
2172  // We can only fix an overloaded reinterpret_cast if
2173  // - it is a template with explicit arguments that resolves to an lvalue
2174  // unambiguously, or
2175  // - it is the only function in an overload set that may have its address
2176  // taken.
2177 
2178  Expr *E = Result.get();
2179  // TODO: what if this fails because of DiagnoseUseOfDecl or something
2180  // like it?
2182  Result,
2183  Expr::getValueKindForType(DestType) ==
2184  VK_PRValue // Convert Fun to Ptr
2185  ) &&
2186  Result.isUsable())
2187  return true;
2188 
2189  // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
2190  // preserves Result.
2191  Result = E;
2193  Result, /*DoFunctionPointerConversion=*/true))
2194  return false;
2195  return Result.isUsable();
2196 }
2197 
2199  QualType DestType, bool CStyle,
2200  SourceRange OpRange,
2201  unsigned &msg,
2202  CastKind &Kind) {
2203  bool IsLValueCast = false;
2204 
2205  DestType = Self.Context.getCanonicalType(DestType);
2206  QualType SrcType = SrcExpr.get()->getType();
2207 
2208  // Is the source an overloaded name? (i.e. &foo)
2209  // If so, reinterpret_cast generally can not help us here (13.4, p1, bullet 5)
2210  if (SrcType == Self.Context.OverloadTy) {
2211  ExprResult FixedExpr = SrcExpr;
2212  if (!fixOverloadedReinterpretCastExpr(Self, DestType, FixedExpr))
2213  return TC_NotApplicable;
2214 
2215  assert(FixedExpr.isUsable() && "Invalid result fixing overloaded expr");
2216  SrcExpr = FixedExpr;
2217  SrcType = SrcExpr.get()->getType();
2218  }
2219 
2220  if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
2221  if (!SrcExpr.get()->isGLValue()) {
2222  // Cannot cast non-glvalue to (lvalue or rvalue) reference type. See the
2223  // similar comment in const_cast.
2224  msg = diag::err_bad_cxx_cast_rvalue;
2225  return TC_NotApplicable;
2226  }
2227 
2228  if (!CStyle) {
2229  Self.CheckCompatibleReinterpretCast(SrcType, DestType,
2230  /*IsDereference=*/false, OpRange);
2231  }
2232 
2233  // C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
2234  // same effect as the conversion *reinterpret_cast<T*>(&x) with the
2235  // built-in & and * operators.
2236 
2237  const char *inappropriate = nullptr;
2238  switch (SrcExpr.get()->getObjectKind()) {
2239  case OK_Ordinary:
2240  break;
2241  case OK_BitField:
2242  msg = diag::err_bad_cxx_cast_bitfield;
2243  return TC_NotApplicable;
2244  // FIXME: Use a specific diagnostic for the rest of these cases.
2245  case OK_VectorComponent: inappropriate = "vector element"; break;
2246  case OK_MatrixComponent:
2247  inappropriate = "matrix element";
2248  break;
2249  case OK_ObjCProperty: inappropriate = "property expression"; break;
2250  case OK_ObjCSubscript: inappropriate = "container subscripting expression";
2251  break;
2252  }
2253  if (inappropriate) {
2254  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_reference)
2255  << inappropriate << DestType
2256  << OpRange << SrcExpr.get()->getSourceRange();
2257  msg = 0; SrcExpr = ExprError();
2258  return TC_NotApplicable;
2259  }
2260 
2261  // This code does this transformation for the checked types.
2262  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
2263  SrcType = Self.Context.getPointerType(SrcType);
2264 
2265  IsLValueCast = true;
2266  }
2267 
2268  // Canonicalize source for comparison.
2269  SrcType = Self.Context.getCanonicalType(SrcType);
2270 
2271  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
2272  *SrcMemPtr = SrcType->getAs<MemberPointerType>();
2273  if (DestMemPtr && SrcMemPtr) {
2274  // C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
2275  // can be explicitly converted to an rvalue of type "pointer to member
2276  // of Y of type T2" if T1 and T2 are both function types or both object
2277  // types.
2278  if (DestMemPtr->isMemberFunctionPointer() !=
2279  SrcMemPtr->isMemberFunctionPointer())
2280  return TC_NotApplicable;
2281 
2282  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2283  // We need to determine the inheritance model that the class will use if
2284  // haven't yet.
2285  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
2286  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
2287  }
2288 
2289  // Don't allow casting between member pointers of different sizes.
2290  if (Self.Context.getTypeSize(DestMemPtr) !=
2291  Self.Context.getTypeSize(SrcMemPtr)) {
2292  msg = diag::err_bad_cxx_cast_member_pointer_size;
2293  return TC_Failed;
2294  }
2295 
2296  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
2297  // constness.
2298  // A reinterpret_cast followed by a const_cast can, though, so in C-style,
2299  // we accept it.
2300  if (auto CACK =
2301  CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2302  /*CheckObjCLifetime=*/CStyle))
2303  return getCastAwayConstnessCastKind(CACK, msg);
2304 
2305  // A valid member pointer cast.
2306  assert(!IsLValueCast);
2307  Kind = CK_ReinterpretMemberPointer;
2308  return TC_Success;
2309  }
2310 
2311  // See below for the enumeral issue.
2312  if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
2313  // C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
2314  // type large enough to hold it. A value of std::nullptr_t can be
2315  // converted to an integral type; the conversion has the same meaning
2316  // and validity as a conversion of (void*)0 to the integral type.
2317  if (Self.Context.getTypeSize(SrcType) >
2318  Self.Context.getTypeSize(DestType)) {
2319  msg = diag::err_bad_reinterpret_cast_small_int;
2320  return TC_Failed;
2321  }
2322  Kind = CK_PointerToIntegral;
2323  return TC_Success;
2324  }
2325 
2326  // Allow reinterpret_casts between vectors of the same size and
2327  // between vectors and integers of the same size.
2328  bool destIsVector = DestType->isVectorType();
2329  bool srcIsVector = SrcType->isVectorType();
2330  if (srcIsVector || destIsVector) {
2331  // Allow bitcasting between SVE VLATs and VLSTs, and vice-versa.
2332  if (Self.isValidSveBitcast(SrcType, DestType)) {
2333  Kind = CK_BitCast;
2334  return TC_Success;
2335  }
2336 
2337  // The non-vector type, if any, must have integral type. This is
2338  // the same rule that C vector casts use; note, however, that enum
2339  // types are not integral in C++.
2340  if ((!destIsVector && !DestType->isIntegralType(Self.Context)) ||
2341  (!srcIsVector && !SrcType->isIntegralType(Self.Context)))
2342  return TC_NotApplicable;
2343 
2344  // The size we want to consider is eltCount * eltSize.
2345  // That's exactly what the lax-conversion rules will check.
2346  if (Self.areLaxCompatibleVectorTypes(SrcType, DestType)) {
2347  Kind = CK_BitCast;
2348  return TC_Success;
2349  }
2350 
2351  if (Self.LangOpts.OpenCL && !CStyle) {
2352  if (DestType->isExtVectorType() || SrcType->isExtVectorType()) {
2353  // FIXME: Allow for reinterpret cast between 3 and 4 element vectors
2354  if (Self.areVectorTypesSameSize(SrcType, DestType)) {
2355  Kind = CK_BitCast;
2356  return TC_Success;
2357  }
2358  }
2359  }
2360 
2361  // Otherwise, pick a reasonable diagnostic.
2362  if (!destIsVector)
2363  msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
2364  else if (!srcIsVector)
2365  msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
2366  else
2367  msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
2368 
2369  return TC_Failed;
2370  }
2371 
2372  if (SrcType == DestType) {
2373  // C++ 5.2.10p2 has a note that mentions that, subject to all other
2374  // restrictions, a cast to the same type is allowed so long as it does not
2375  // cast away constness. In C++98, the intent was not entirely clear here,
2376  // since all other paragraphs explicitly forbid casts to the same type.
2377  // C++11 clarifies this case with p2.
2378  //
2379  // The only allowed types are: integral, enumeration, pointer, or
2380  // pointer-to-member types. We also won't restrict Obj-C pointers either.
2381  Kind = CK_NoOp;
2383  if (SrcType->isIntegralOrEnumerationType() ||
2384  SrcType->isAnyPointerType() ||
2385  SrcType->isMemberPointerType() ||
2386  SrcType->isBlockPointerType()) {
2387  Result = TC_Success;
2388  }
2389  return Result;
2390  }
2391 
2392  bool destIsPtr = DestType->isAnyPointerType() ||
2393  DestType->isBlockPointerType();
2394  bool srcIsPtr = SrcType->isAnyPointerType() ||
2395  SrcType->isBlockPointerType();
2396  if (!destIsPtr && !srcIsPtr) {
2397  // Except for std::nullptr_t->integer and lvalue->reference, which are
2398  // handled above, at least one of the two arguments must be a pointer.
2399  return TC_NotApplicable;
2400  }
2401 
2402  if (DestType->isIntegralType(Self.Context)) {
2403  assert(srcIsPtr && "One type must be a pointer");
2404  // C++ 5.2.10p4: A pointer can be explicitly converted to any integral
2405  // type large enough to hold it; except in Microsoft mode, where the
2406  // integral type size doesn't matter (except we don't allow bool).
2407  if ((Self.Context.getTypeSize(SrcType) >
2408  Self.Context.getTypeSize(DestType))) {
2409  bool MicrosoftException =
2410  Self.getLangOpts().MicrosoftExt && !DestType->isBooleanType();
2411  if (MicrosoftException) {
2412  unsigned Diag = SrcType->isVoidPointerType()
2413  ? diag::warn_void_pointer_to_int_cast
2414  : diag::warn_pointer_to_int_cast;
2415  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2416  } else {
2417  msg = diag::err_bad_reinterpret_cast_small_int;
2418  return TC_Failed;
2419  }
2420  }
2421  Kind = CK_PointerToIntegral;
2422  return TC_Success;
2423  }
2424 
2425  if (SrcType->isIntegralOrEnumerationType()) {
2426  assert(destIsPtr && "One type must be a pointer");
2427  checkIntToPointerCast(CStyle, OpRange, SrcExpr.get(), DestType, Self);
2428  // C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
2429  // converted to a pointer.
2430  // C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
2431  // necessarily converted to a null pointer value.]
2432  Kind = CK_IntegralToPointer;
2433  return TC_Success;
2434  }
2435 
2436  if (!destIsPtr || !srcIsPtr) {
2437  // With the valid non-pointer conversions out of the way, we can be even
2438  // more stringent.
2439  return TC_NotApplicable;
2440  }
2441 
2442  // Cannot convert between block pointers and Objective-C object pointers.
2443  if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) ||
2444  (DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
2445  return TC_NotApplicable;
2446 
2447  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
2448  // The C-style cast operator can.
2449  TryCastResult SuccessResult = TC_Success;
2450  if (auto CACK =
2451  CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2452  /*CheckObjCLifetime=*/CStyle))
2453  SuccessResult = getCastAwayConstnessCastKind(CACK, msg);
2454 
2455  if (IsAddressSpaceConversion(SrcType, DestType)) {
2456  Kind = CK_AddressSpaceConversion;
2457  assert(SrcType->isPointerType() && DestType->isPointerType());
2458  if (!CStyle &&
2460  SrcType->getPointeeType().getQualifiers())) {
2461  SuccessResult = TC_Failed;
2462  }
2463  } else if (IsLValueCast) {
2464  Kind = CK_LValueBitCast;
2465  } else if (DestType->isObjCObjectPointerType()) {
2466  Kind = Self.PrepareCastToObjCObjectPointer(SrcExpr);
2467  } else if (DestType->isBlockPointerType()) {
2468  if (!SrcType->isBlockPointerType()) {
2469  Kind = CK_AnyPointerToBlockPointerCast;
2470  } else {
2471  Kind = CK_BitCast;
2472  }
2473  } else {
2474  Kind = CK_BitCast;
2475  }
2476 
2477  // Any pointer can be cast to an Objective-C pointer type with a C-style
2478  // cast.
2479  if (CStyle && DestType->isObjCObjectPointerType()) {
2480  return SuccessResult;
2481  }
2482  if (CStyle)
2483  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2484 
2485  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2486 
2487  // Not casting away constness, so the only remaining check is for compatible
2488  // pointer categories.
2489 
2490  if (SrcType->isFunctionPointerType()) {
2491  if (DestType->isFunctionPointerType()) {
2492  // C++ 5.2.10p6: A pointer to a function can be explicitly converted to
2493  // a pointer to a function of a different type.
2494  return SuccessResult;
2495  }
2496 
2497  // C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
2498  // an object type or vice versa is conditionally-supported.
2499  // Compilers support it in C++03 too, though, because it's necessary for
2500  // casting the return value of dlsym() and GetProcAddress().
2501  // FIXME: Conditionally-supported behavior should be configurable in the
2502  // TargetInfo or similar.
2503  Self.Diag(OpRange.getBegin(),
2504  Self.getLangOpts().CPlusPlus11 ?
2505  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2506  << OpRange;
2507  return SuccessResult;
2508  }
2509 
2510  if (DestType->isFunctionPointerType()) {
2511  // See above.
2512  Self.Diag(OpRange.getBegin(),
2513  Self.getLangOpts().CPlusPlus11 ?
2514  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2515  << OpRange;
2516  return SuccessResult;
2517  }
2518 
2519  // Diagnose address space conversion in nested pointers.
2520  QualType DestPtee = DestType->getPointeeType().isNull()
2521  ? DestType->getPointeeType()
2522  : DestType->getPointeeType()->getPointeeType();
2523  QualType SrcPtee = SrcType->getPointeeType().isNull()
2524  ? SrcType->getPointeeType()
2525  : SrcType->getPointeeType()->getPointeeType();
2526  while (!DestPtee.isNull() && !SrcPtee.isNull()) {
2527  if (DestPtee.getAddressSpace() != SrcPtee.getAddressSpace()) {
2528  Self.Diag(OpRange.getBegin(),
2529  diag::warn_bad_cxx_cast_nested_pointer_addr_space)
2530  << CStyle << SrcType << DestType << SrcExpr.get()->getSourceRange();
2531  break;
2532  }
2533  DestPtee = DestPtee->getPointeeType();
2534  SrcPtee = SrcPtee->getPointeeType();
2535  }
2536 
2537  // C++ 5.2.10p7: A pointer to an object can be explicitly converted to
2538  // a pointer to an object of different type.
2539  // Void pointers are not specified, but supported by every compiler out there.
2540  // So we finish by allowing everything that remains - it's got to be two
2541  // object pointers.
2542  return SuccessResult;
2543 }
2544 
2546  QualType DestType, bool CStyle,
2547  unsigned &msg, CastKind &Kind) {
2548  if (!Self.getLangOpts().OpenCL)
2549  // FIXME: As compiler doesn't have any information about overlapping addr
2550  // spaces at the moment we have to be permissive here.
2551  return TC_NotApplicable;
2552  // Even though the logic below is general enough and can be applied to
2553  // non-OpenCL mode too, we fast-path above because no other languages
2554  // define overlapping address spaces currently.
2555  auto SrcType = SrcExpr.get()->getType();
2556  // FIXME: Should this be generalized to references? The reference parameter
2557  // however becomes a reference pointee type here and therefore rejected.
2558  // Perhaps this is the right behavior though according to C++.
2559  auto SrcPtrType = SrcType->getAs<PointerType>();
2560  if (!SrcPtrType)
2561  return TC_NotApplicable;
2562  auto DestPtrType = DestType->getAs<PointerType>();
2563  if (!DestPtrType)
2564  return TC_NotApplicable;
2565  auto SrcPointeeType = SrcPtrType->getPointeeType();
2566  auto DestPointeeType = DestPtrType->getPointeeType();
2567  if (!DestPointeeType.isAddressSpaceOverlapping(SrcPointeeType)) {
2568  msg = diag::err_bad_cxx_cast_addr_space_mismatch;
2569  return TC_Failed;
2570  }
2571  auto SrcPointeeTypeWithoutAS =
2572  Self.Context.removeAddrSpaceQualType(SrcPointeeType.getCanonicalType());
2573  auto DestPointeeTypeWithoutAS =
2574  Self.Context.removeAddrSpaceQualType(DestPointeeType.getCanonicalType());
2575  if (Self.Context.hasSameType(SrcPointeeTypeWithoutAS,
2576  DestPointeeTypeWithoutAS)) {
2577  Kind = SrcPointeeType.getAddressSpace() == DestPointeeType.getAddressSpace()
2578  ? CK_NoOp
2579  : CK_AddressSpaceConversion;
2580  return TC_Success;
2581  } else {
2582  return TC_NotApplicable;
2583  }
2584 }
2585 
2586 void CastOperation::checkAddressSpaceCast(QualType SrcType, QualType DestType) {
2587  // In OpenCL only conversions between pointers to objects in overlapping
2588  // addr spaces are allowed. v2.0 s6.5.5 - Generic addr space overlaps
2589  // with any named one, except for constant.
2590 
2591  // Converting the top level pointee addrspace is permitted for compatible
2592  // addrspaces (such as 'generic int *' to 'local int *' or vice versa), but
2593  // if any of the nested pointee addrspaces differ, we emit a warning
2594  // regardless of addrspace compatibility. This makes
2595  // local int ** p;
2596  // return (generic int **) p;
2597  // warn even though local -> generic is permitted.
2598  if (Self.getLangOpts().OpenCL) {
2599  const Type *DestPtr, *SrcPtr;
2600  bool Nested = false;
2601  unsigned DiagID = diag::err_typecheck_incompatible_address_space;
2602  DestPtr = Self.getASTContext().getCanonicalType(DestType.getTypePtr()),
2603  SrcPtr = Self.getASTContext().getCanonicalType(SrcType.getTypePtr());
2604 
2605  while (isa<PointerType>(DestPtr) && isa<PointerType>(SrcPtr)) {
2606  const PointerType *DestPPtr = cast<PointerType>(DestPtr);
2607  const PointerType *SrcPPtr = cast<PointerType>(SrcPtr);
2608  QualType DestPPointee = DestPPtr->getPointeeType();
2609  QualType SrcPPointee = SrcPPtr->getPointeeType();
2610  if (Nested
2611  ? DestPPointee.getAddressSpace() != SrcPPointee.getAddressSpace()
2612  : !DestPPointee.isAddressSpaceOverlapping(SrcPPointee)) {
2613  Self.Diag(OpRange.getBegin(), DiagID)
2614  << SrcType << DestType << Sema::AA_Casting
2615  << SrcExpr.get()->getSourceRange();
2616  if (!Nested)
2617  SrcExpr = ExprError();
2618  return;
2619  }
2620 
2621  DestPtr = DestPPtr->getPointeeType().getTypePtr();
2622  SrcPtr = SrcPPtr->getPointeeType().getTypePtr();
2623  Nested = true;
2624  DiagID = diag::ext_nested_pointer_qualifier_mismatch;
2625  }
2626  }
2627 }
2628 
2630  bool SrcCompatXL = this->getLangOpts().getAltivecSrcCompat() ==
2632  VectorType::VectorKind VKind = VecTy->getVectorKind();
2633 
2634  if ((VKind == VectorType::AltiVecVector) ||
2635  (SrcCompatXL && ((VKind == VectorType::AltiVecBool) ||
2636  (VKind == VectorType::AltiVecPixel)))) {
2637  return true;
2638  }
2639  return false;
2640 }
2641 
2643  QualType SrcTy) {
2644  bool SrcCompatGCC = this->getLangOpts().getAltivecSrcCompat() ==
2646  if (this->getLangOpts().AltiVec && SrcCompatGCC) {
2647  this->Diag(R.getBegin(),
2648  diag::err_invalid_conversion_between_vector_and_integer)
2649  << VecTy << SrcTy << R;
2650  return true;
2651  }
2652  return false;
2653 }
2654 
2655 void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
2656  bool ListInitialization) {
2657  assert(Self.getLangOpts().CPlusPlus);
2658 
2659  // Handle placeholders.
2660  if (isPlaceholder()) {
2661  // C-style casts can resolve __unknown_any types.
2662  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2663  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2664  SrcExpr.get(), Kind,
2665  ValueKind, BasePath);
2666  return;
2667  }
2668 
2669  checkNonOverloadPlaceholders();
2670  if (SrcExpr.isInvalid())
2671  return;
2672  }
2673 
2674  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
2675  // This test is outside everything else because it's the only case where
2676  // a non-lvalue-reference target type does not lead to decay.
2677  if (DestType->isVoidType()) {
2678  Kind = CK_ToVoid;
2679 
2680  if (claimPlaceholder(BuiltinType::Overload)) {
2681  Self.ResolveAndFixSingleFunctionTemplateSpecialization(
2682  SrcExpr, /* Decay Function to ptr */ false,
2683  /* Complain */ true, DestRange, DestType,
2684  diag::err_bad_cstyle_cast_overload);
2685  if (SrcExpr.isInvalid())
2686  return;
2687  }
2688 
2689  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2690  return;
2691  }
2692 
2693  // If the type is dependent, we won't do any other semantic analysis now.
2694  if (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2695  SrcExpr.get()->isValueDependent()) {
2696  assert(Kind == CK_Dependent);
2697  return;
2698  }
2699 
2700  if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
2701  !isPlaceholder(BuiltinType::Overload)) {
2702  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2703  if (SrcExpr.isInvalid())
2704  return;
2705  }
2706 
2707  // AltiVec vector initialization with a single literal.
2708  if (const VectorType *vecTy = DestType->getAs<VectorType>()) {
2709  if (Self.CheckAltivecInitFromScalar(OpRange, DestType,
2710  SrcExpr.get()->getType())) {
2711  SrcExpr = ExprError();
2712  return;
2713  }
2714  if (Self.ShouldSplatAltivecScalarInCast(vecTy) &&
2715  (SrcExpr.get()->getType()->isIntegerType() ||
2716  SrcExpr.get()->getType()->isFloatingType())) {
2717  Kind = CK_VectorSplat;
2718  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2719  return;
2720  }
2721  }
2722 
2723  // C++ [expr.cast]p5: The conversions performed by
2724  // - a const_cast,
2725  // - a static_cast,
2726  // - a static_cast followed by a const_cast,
2727  // - a reinterpret_cast, or
2728  // - a reinterpret_cast followed by a const_cast,
2729  // can be performed using the cast notation of explicit type conversion.
2730  // [...] If a conversion can be interpreted in more than one of the ways
2731  // listed above, the interpretation that appears first in the list is used,
2732  // even if a cast resulting from that interpretation is ill-formed.
2733  // In plain language, this means trying a const_cast ...
2734  // Note that for address space we check compatibility after const_cast.
2735  unsigned msg = diag::err_bad_cxx_cast_generic;
2736  TryCastResult tcr = TryConstCast(Self, SrcExpr, DestType,
2737  /*CStyle*/ true, msg);
2738  if (SrcExpr.isInvalid())
2739  return;
2740  if (isValidCast(tcr))
2741  Kind = CK_NoOp;
2742 
2744  FunctionalStyle ? Sema::CCK_FunctionalCast : Sema::CCK_CStyleCast;
2745  if (tcr == TC_NotApplicable) {
2746  tcr = TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ true, msg,
2747  Kind);
2748  if (SrcExpr.isInvalid())
2749  return;
2750 
2751  if (tcr == TC_NotApplicable) {
2752  // ... or if that is not possible, a static_cast, ignoring const and
2753  // addr space, ...
2754  tcr = TryStaticCast(Self, SrcExpr, DestType, CCK, OpRange, msg, Kind,
2755  BasePath, ListInitialization);
2756  if (SrcExpr.isInvalid())
2757  return;
2758 
2759  if (tcr == TC_NotApplicable) {
2760  // ... and finally a reinterpret_cast, ignoring const and addr space.
2761  tcr = TryReinterpretCast(Self, SrcExpr, DestType, /*CStyle*/ true,
2762  OpRange, msg, Kind);
2763  if (SrcExpr.isInvalid())
2764  return;
2765  }
2766  }
2767  }
2768 
2769  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
2770  isValidCast(tcr))
2771  checkObjCConversion(CCK);
2772 
2773  if (tcr != TC_Success && msg != 0) {
2774  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2775  DeclAccessPair Found;
2776  FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
2777  DestType,
2778  /*Complain*/ true,
2779  Found);
2780  if (Fn) {
2781  // If DestType is a function type (not to be confused with the function
2782  // pointer type), it will be possible to resolve the function address,
2783  // but the type cast should be considered as failure.
2784  OverloadExpr *OE = OverloadExpr::find(SrcExpr.get()).Expression;
2785  Self.Diag(OpRange.getBegin(), diag::err_bad_cstyle_cast_overload)
2786  << OE->getName() << DestType << OpRange
2787  << OE->getQualifierLoc().getSourceRange();
2788  Self.NoteAllOverloadCandidates(SrcExpr.get());
2789  }
2790  } else {
2791  diagnoseBadCast(Self, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
2792  OpRange, SrcExpr.get(), DestType, ListInitialization);
2793  }
2794  }
2795 
2796  if (isValidCast(tcr)) {
2797  if (Kind == CK_BitCast)
2798  checkCastAlign();
2799 
2800  if (!checkCastFunctionType(Self, SrcExpr, DestType))
2801  Self.Diag(OpRange.getBegin(), diag::warn_cast_function_type)
2802  << SrcExpr.get()->getType() << DestType << OpRange;
2803 
2804  } else {
2805  SrcExpr = ExprError();
2806  }
2807 }
2808 
2809 /// DiagnoseBadFunctionCast - Warn whenever a function call is cast to a
2810 /// non-matching type. Such as enum function call to int, int call to
2811 /// pointer; etc. Cast to 'void' is an exception.
2812 static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr,
2813  QualType DestType) {
2814  if (Self.Diags.isIgnored(diag::warn_bad_function_cast,
2815  SrcExpr.get()->getExprLoc()))
2816  return;
2817 
2818  if (!isa<CallExpr>(SrcExpr.get()))
2819  return;
2820 
2821  QualType SrcType = SrcExpr.get()->getType();
2822  if (DestType.getUnqualifiedType()->isVoidType())
2823  return;
2824  if ((SrcType->isAnyPointerType() || SrcType->isBlockPointerType())
2825  && (DestType->isAnyPointerType() || DestType->isBlockPointerType()))
2826  return;
2827  if (SrcType->isIntegerType() && DestType->isIntegerType() &&
2828  (SrcType->isBooleanType() == DestType->isBooleanType()) &&
2829  (SrcType->isEnumeralType() == DestType->isEnumeralType()))
2830  return;
2831  if (SrcType->isRealFloatingType() && DestType->isRealFloatingType())
2832  return;
2833  if (SrcType->isEnumeralType() && DestType->isEnumeralType())
2834  return;
2835  if (SrcType->isComplexType() && DestType->isComplexType())
2836  return;
2837  if (SrcType->isComplexIntegerType() && DestType->isComplexIntegerType())
2838  return;
2839  if (SrcType->isFixedPointType() && DestType->isFixedPointType())
2840  return;
2841 
2842  Self.Diag(SrcExpr.get()->getExprLoc(),
2843  diag::warn_bad_function_cast)
2844  << SrcType << DestType << SrcExpr.get()->getSourceRange();
2845 }
2846 
2847 /// Check the semantics of a C-style cast operation, in C.
2848 void CastOperation::CheckCStyleCast() {
2849  assert(!Self.getLangOpts().CPlusPlus);
2850 
2851  // C-style casts can resolve __unknown_any types.
2852  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2853  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2854  SrcExpr.get(), Kind,
2855  ValueKind, BasePath);
2856  return;
2857  }
2858 
2859  // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2860  // type needs to be scalar.
2861  if (DestType->isVoidType()) {
2862  // We don't necessarily do lvalue-to-rvalue conversions on this.
2863  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2864  if (SrcExpr.isInvalid())
2865  return;
2866 
2867  // Cast to void allows any expr type.
2868  Kind = CK_ToVoid;
2869  return;
2870  }
2871 
2872  // If the type is dependent, we won't do any other semantic analysis now.
2873  if (Self.getASTContext().isDependenceAllowed() &&
2874  (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2875  SrcExpr.get()->isValueDependent())) {
2876  assert((DestType->containsErrors() || SrcExpr.get()->containsErrors() ||
2877  SrcExpr.get()->containsErrors()) &&
2878  "should only occur in error-recovery path.");
2879  assert(Kind == CK_Dependent);
2880  return;
2881  }
2882 
2883  // Overloads are allowed with C extensions, so we need to support them.
2884  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2885  DeclAccessPair DAP;
2886  if (FunctionDecl *FD = Self.ResolveAddressOfOverloadedFunction(
2887  SrcExpr.get(), DestType, /*Complain=*/true, DAP))
2888  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr.get(), DAP, FD);
2889  else
2890  return;
2891  assert(SrcExpr.isUsable());
2892  }
2893  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2894  if (SrcExpr.isInvalid())
2895  return;
2896  QualType SrcType = SrcExpr.get()->getType();
2897 
2898  assert(!SrcType->isPlaceholderType());
2899 
2900  checkAddressSpaceCast(SrcType, DestType);
2901  if (SrcExpr.isInvalid())
2902  return;
2903 
2904  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
2905  diag::err_typecheck_cast_to_incomplete)) {
2906  SrcExpr = ExprError();
2907  return;
2908  }
2909 
2910  // Allow casting a sizeless built-in type to itself.
2911  if (DestType->isSizelessBuiltinType() &&
2912  Self.Context.hasSameUnqualifiedType(DestType, SrcType)) {
2913  Kind = CK_NoOp;
2914  return;
2915  }
2916 
2917  // Allow bitcasting between compatible SVE vector types.
2918  if ((SrcType->isVectorType() || DestType->isVectorType()) &&
2919  Self.isValidSveBitcast(SrcType, DestType)) {
2920  Kind = CK_BitCast;
2921  return;
2922  }
2923 
2924  if (!DestType->isScalarType() && !DestType->isVectorType() &&
2925  !DestType->isMatrixType()) {
2926  const RecordType *DestRecordTy = DestType->getAs<RecordType>();
2927 
2928  if (DestRecordTy && Self.Context.hasSameUnqualifiedType(DestType, SrcType)){
2929  // GCC struct/union extension: allow cast to self.
2930  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_nonscalar)
2931  << DestType << SrcExpr.get()->getSourceRange();
2932  Kind = CK_NoOp;
2933  return;
2934  }
2935 
2936  // GCC's cast to union extension.
2937  if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
2938  RecordDecl *RD = DestRecordTy->getDecl();
2939  if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
2940  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
2941  << SrcExpr.get()->getSourceRange();
2942  Kind = CK_ToUnion;
2943  return;
2944  } else {
2945  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
2946  << SrcType << SrcExpr.get()->getSourceRange();
2947  SrcExpr = ExprError();
2948  return;
2949  }
2950  }
2951 
2952  // OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.
2953  if (Self.getLangOpts().OpenCL && DestType->isEventT()) {
2954  Expr::EvalResult Result;
2955  if (SrcExpr.get()->EvaluateAsInt(Result, Self.Context)) {
2956  llvm::APSInt CastInt = Result.Val.getInt();
2957  if (0 == CastInt) {
2958  Kind = CK_ZeroToOCLOpaqueType;
2959  return;
2960  }
2961  Self.Diag(OpRange.getBegin(),
2962  diag::err_opencl_cast_non_zero_to_event_t)
2963  << toString(CastInt, 10) << SrcExpr.get()->getSourceRange();
2964  SrcExpr = ExprError();
2965  return;
2966  }
2967  }
2968 
2969  // Reject any other conversions to non-scalar types.
2970  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cond_expect_scalar)
2971  << DestType << SrcExpr.get()->getSourceRange();
2972  SrcExpr = ExprError();
2973  return;
2974  }
2975 
2976  // The type we're casting to is known to be a scalar, a vector, or a matrix.
2977 
2978  // Require the operand to be a scalar, a vector, or a matrix.
2979  if (!SrcType->isScalarType() && !SrcType->isVectorType() &&
2980  !SrcType->isMatrixType()) {
2981  Self.Diag(SrcExpr.get()->getExprLoc(),
2982  diag::err_typecheck_expect_scalar_operand)
2983  << SrcType << SrcExpr.get()->getSourceRange();
2984  SrcExpr = ExprError();
2985  return;
2986  }
2987 
2988  if (DestType->isExtVectorType()) {
2989  SrcExpr = Self.CheckExtVectorCast(OpRange, DestType, SrcExpr.get(), Kind);
2990  return;
2991  }
2992 
2993  if (DestType->getAs<MatrixType>() || SrcType->getAs<MatrixType>()) {
2994  if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind))
2995  SrcExpr = ExprError();
2996  return;
2997  }
2998 
2999  if (const VectorType *DestVecTy = DestType->getAs<VectorType>()) {
3000  if (Self.CheckAltivecInitFromScalar(OpRange, DestType, SrcType)) {
3001  SrcExpr = ExprError();
3002  return;
3003  }
3004  if (Self.ShouldSplatAltivecScalarInCast(DestVecTy) &&
3005  (SrcType->isIntegerType() || SrcType->isFloatingType())) {
3006  Kind = CK_VectorSplat;
3007  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
3008  } else if (Self.CheckVectorCast(OpRange, DestType, SrcType, Kind)) {
3009  SrcExpr = ExprError();
3010  }
3011  return;
3012  }
3013 
3014  if (SrcType->isVectorType()) {
3015  if (Self.CheckVectorCast(OpRange, SrcType, DestType, Kind))
3016  SrcExpr = ExprError();
3017  return;
3018  }
3019 
3020  // The source and target types are both scalars, i.e.
3021  // - arithmetic types (fundamental, enum, and complex)
3022  // - all kinds of pointers
3023  // Note that member pointers were filtered out with C++, above.
3024 
3025  if (isa<ObjCSelectorExpr>(SrcExpr.get())) {
3026  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_selector_expr);
3027  SrcExpr = ExprError();
3028  return;
3029  }
3030 
3031  // Can't cast to or from bfloat
3032  if (DestType->isBFloat16Type() && !SrcType->isBFloat16Type()) {
3033  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_to_bfloat16)
3034  << SrcExpr.get()->getSourceRange();
3035  SrcExpr = ExprError();
3036  return;
3037  }
3038  if (SrcType->isBFloat16Type() && !DestType->isBFloat16Type()) {
3039  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_from_bfloat16)
3040  << SrcExpr.get()->getSourceRange();
3041  SrcExpr = ExprError();
3042  return;
3043  }
3044 
3045  // If either type is a pointer, the other type has to be either an
3046  // integer or a pointer.
3047  if (!DestType->isArithmeticType()) {
3048  if (!SrcType->isIntegralType(Self.Context) && SrcType->isArithmeticType()) {
3049  Self.Diag(SrcExpr.get()->getExprLoc(),
3050  diag::err_cast_pointer_from_non_pointer_int)
3051  << SrcType << SrcExpr.get()->getSourceRange();
3052  SrcExpr = ExprError();
3053  return;
3054  }
3055  checkIntToPointerCast(/* CStyle */ true, OpRange, SrcExpr.get(), DestType,
3056  Self);
3057  } else if (!SrcType->isArithmeticType()) {
3058  if (!DestType->isIntegralType(Self.Context) &&
3059  DestType->isArithmeticType()) {
3060  Self.Diag(SrcExpr.get()->getBeginLoc(),
3061  diag::err_cast_pointer_to_non_pointer_int)
3062  << DestType << SrcExpr.get()->getSourceRange();
3063  SrcExpr = ExprError();
3064  return;
3065  }
3066 
3067  if ((Self.Context.getTypeSize(SrcType) >
3068  Self.Context.getTypeSize(DestType)) &&
3069  !DestType->isBooleanType()) {
3070  // C 6.3.2.3p6: Any pointer type may be converted to an integer type.
3071  // Except as previously specified, the result is implementation-defined.
3072  // If the result cannot be represented in the integer type, the behavior
3073  // is undefined. The result need not be in the range of values of any
3074  // integer type.
3075  unsigned Diag;
3076  if (SrcType->isVoidPointerType())
3077  Diag = DestType->isEnumeralType() ? diag::warn_void_pointer_to_enum_cast
3078  : diag::warn_void_pointer_to_int_cast;
3079  else if (DestType->isEnumeralType())
3080  Diag = diag::warn_pointer_to_enum_cast;
3081  else
3082  Diag = diag::warn_pointer_to_int_cast;
3083  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
3084  }
3085  }
3086 
3087  if (Self.getLangOpts().OpenCL && !Self.getOpenCLOptions().isAvailableOption(
3088  "cl_khr_fp16", Self.getLangOpts())) {
3089  if (DestType->isHalfType()) {
3090  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::err_opencl_cast_to_half)
3091  << DestType << SrcExpr.get()->getSourceRange();
3092  SrcExpr = ExprError();
3093  return;
3094  }
3095  }
3096 
3097  // ARC imposes extra restrictions on casts.
3098  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers()) {
3099  checkObjCConversion(Sema::CCK_CStyleCast);
3100  if (SrcExpr.isInvalid())
3101  return;
3102 
3103  const PointerType *CastPtr = DestType->getAs<PointerType>();
3104  if (Self.getLangOpts().ObjCAutoRefCount && CastPtr) {
3105  if (const PointerType *ExprPtr = SrcType->getAs<PointerType>()) {
3106  Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
3107  Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
3108  if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
3109  ExprPtr->getPointeeType()->isObjCLifetimeType() &&
3110  !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
3111  Self.Diag(SrcExpr.get()->getBeginLoc(),
3112  diag::err_typecheck_incompatible_ownership)
3113  << SrcType << DestType << Sema::AA_Casting
3114  << SrcExpr.get()->getSourceRange();
3115  return;
3116  }
3117  }
3118  }
3119  else if (!Self.CheckObjCARCUnavailableWeakConversion(DestType, SrcType)) {
3120  Self.Diag(SrcExpr.get()->getBeginLoc(),
3121  diag::err_arc_convesion_of_weak_unavailable)
3122  << 1 << SrcType << DestType << SrcExpr.get()->getSourceRange();
3123  SrcExpr = ExprError();
3124  return;
3125  }
3126  }
3127 
3128  if (!checkCastFunctionType(Self, SrcExpr, DestType))
3129  Self.Diag(OpRange.getBegin(), diag::warn_cast_function_type)
3130  << SrcType << DestType << OpRange;
3131 
3132  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
3133  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
3134  DiagnoseBadFunctionCast(Self, SrcExpr, DestType);
3135  Kind = Self.PrepareScalarCast(SrcExpr, DestType);
3136  if (SrcExpr.isInvalid())
3137  return;
3138 
3139  if (Kind == CK_BitCast)
3140  checkCastAlign();
3141 }
3142 
3143 void CastOperation::CheckBuiltinBitCast() {
3144  QualType SrcType = SrcExpr.get()->getType();
3145 
3146  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
3147  diag::err_typecheck_cast_to_incomplete) ||
3148  Self.RequireCompleteType(OpRange.getBegin(), SrcType,
3149  diag::err_incomplete_type)) {
3150  SrcExpr = ExprError();
3151  return;
3152  }
3153 
3154  if (SrcExpr.get()->isPRValue())
3155  SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcType, SrcExpr.get(),
3156  /*IsLValueReference=*/false);
3157 
3158  CharUnits DestSize = Self.Context.getTypeSizeInChars(DestType);
3159  CharUnits SourceSize = Self.Context.getTypeSizeInChars(SrcType);
3160  if (DestSize != SourceSize) {
3161  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_type_size_mismatch)
3162  << (int)SourceSize.getQuantity() << (int)DestSize.getQuantity();
3163  SrcExpr = ExprError();
3164  return;
3165  }
3166 
3167  if (!DestType.isTriviallyCopyableType(Self.Context)) {
3168  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3169  << 1;
3170  SrcExpr = ExprError();
3171  return;
3172  }
3173 
3174  if (!SrcType.isTriviallyCopyableType(Self.Context)) {
3175  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3176  << 0;
3177  SrcExpr = ExprError();
3178  return;
3179  }
3180 
3181  Kind = CK_LValueToRValueBitCast;
3182 }
3183 
3184 /// DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either
3185 /// const, volatile or both.
3186 static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
3187  QualType DestType) {
3188  if (SrcExpr.isInvalid())
3189  return;
3190 
3191  QualType SrcType = SrcExpr.get()->getType();
3192  if (!((SrcType->isAnyPointerType() && DestType->isAnyPointerType()) ||
3193  DestType->isLValueReferenceType()))
3194  return;
3195 
3196  QualType TheOffendingSrcType, TheOffendingDestType;
3197  Qualifiers CastAwayQualifiers;
3198  if (CastsAwayConstness(Self, SrcType, DestType, true, false,
3199  &TheOffendingSrcType, &TheOffendingDestType,
3200  &CastAwayQualifiers) !=
3201  CastAwayConstnessKind::CACK_Similar)
3202  return;
3203 
3204  // FIXME: 'restrict' is not properly handled here.
3205  int qualifiers = -1;
3206  if (CastAwayQualifiers.hasConst() && CastAwayQualifiers.hasVolatile()) {
3207  qualifiers = 0;
3208  } else if (CastAwayQualifiers.hasConst()) {
3209  qualifiers = 1;
3210  } else if (CastAwayQualifiers.hasVolatile()) {
3211  qualifiers = 2;
3212  }
3213  // This is a variant of int **x; const int **y = (const int **)x;
3214  if (qualifiers == -1)
3215  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual2)
3216  << SrcType << DestType;
3217  else
3218  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual)
3219  << TheOffendingSrcType << TheOffendingDestType << qualifiers;
3220 }
3221 
3223  TypeSourceInfo *CastTypeInfo,
3224  SourceLocation RPLoc,
3225  Expr *CastExpr) {
3226  CastOperation Op(*this, CastTypeInfo->getType(), CastExpr);
3227  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3228  Op.OpRange = SourceRange(LPLoc, CastExpr->getEndLoc());
3229 
3230  if (getLangOpts().CPlusPlus) {
3231  Op.CheckCXXCStyleCast(/*FunctionalCast=*/ false,
3232  isa<InitListExpr>(CastExpr));
3233  } else {
3234  Op.CheckCStyleCast();
3235  }
3236 
3237  if (Op.SrcExpr.isInvalid())
3238  return ExprError();
3239 
3240  // -Wcast-qual
3241  DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
3242 
3243  return Op.complete(CStyleCastExpr::Create(
3244  Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
3245  &Op.BasePath, CurFPFeatureOverrides(), CastTypeInfo, LPLoc, RPLoc));
3246 }
3247 
3249  QualType Type,
3250  SourceLocation LPLoc,
3251  Expr *CastExpr,
3252  SourceLocation RPLoc) {
3253  assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
3254  CastOperation Op(*this, Type, CastExpr);
3255  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3256  Op.OpRange = SourceRange(Op.DestRange.getBegin(), CastExpr->getEndLoc());
3257 
3258  Op.CheckCXXCStyleCast(/*FunctionalCast=*/true, /*ListInit=*/false);
3259  if (Op.SrcExpr.isInvalid())
3260  return ExprError();
3261 
3262  auto *SubExpr = Op.SrcExpr.get();
3263  if (auto *BindExpr = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
3264  SubExpr = BindExpr->getSubExpr();
3265  if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
3266  ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
3267 
3268  return Op.complete(CXXFunctionalCastExpr::Create(
3269  Context, Op.ResultType, Op.ValueKind, CastTypeInfo, Op.Kind,
3270  Op.SrcExpr.get(), &Op.BasePath, CurFPFeatureOverrides(), LPLoc, RPLoc));
3271 }
clang::Type::isIntegralType
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1925
clang::BuiltinType
This class is used for builtin types like 'int'.
Definition: Type.h:2493
clang::Type::isRecordType
bool isRecordType() const
Definition: Type.h:6766
clang::TokenValue
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:91
TryStaticDowncast
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:1599
clang::QualType::getCVRQualifiers
unsigned getCVRQualifiers() const
Retrieve the set of CVR (const-volatile-restrict) qualifiers applied to this type.
Definition: Type.h:6461
TC_Success
@ TC_Success
The cast method is appropriate and successful.
Definition: SemaCast.cpp:35
clang::Sema::CheckPlaceholderExpr
ExprResult CheckPlaceholderExpr(Expr *E)
Check for operands with placeholder types and complain if found.
Definition: SemaExpr.cpp:19725
clang::ASTContext::getTypeDeclType
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:1544
clang::Type::isBlockPointerType
bool isBlockPointerType() const
Definition: Type.h:6684
clang::Sema::CompareReferenceRelationship
ReferenceCompareResult CompareReferenceRelationship(SourceLocation Loc, QualType T1, QualType T2, ReferenceConversions *Conv=nullptr)
CompareReferenceRelationship - Compare the two types T1 and T2 to determine whether they are referenc...
Definition: SemaOverload.cpp:4520
clang::OK_Ordinary
@ OK_Ordinary
An ordinary object is located at an address in memory.
Definition: Specifiers.h:136
clang::TypeSourceInfo::getType
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6410
clang::Expr::isLValue
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language.
Definition: Expr.h:270
isValidCast
static bool isValidCast(TryCastResult TCR)
Definition: SemaCast.cpp:42
clang::SourceRange
A trivial tuple used to represent a source range.
Definition: SourceLocation.h:210
string
string(SUBSTRING ${CMAKE_CURRENT_BINARY_DIR} 0 ${PATH_LIB_START} PATH_HEAD) string(SUBSTRING $
Definition: CMakeLists.txt:22
clang::Type::isVoidPointerType
bool isVoidPointerType() const
Definition: Type.cpp:589
clang::Preprocessor::getLastMacroWithSpelling
StringRef getLastMacroWithSpelling(SourceLocation Loc, ArrayRef< TokenValue > Tokens) const
Return the name of the macro defined before Loc that has spelling Tokens.
Definition: Preprocessor.cpp:351
clang::DiagnosticOptions::MSVC
@ MSVC
Definition: DiagnosticOptions.h:77
clang::Qualifiers::fromCVRMask
static Qualifiers fromCVRMask(unsigned CVR)
Definition: Type.h:238
clang::FixItHint::CreateInsertion
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:96
clang::Sema::getASTContext
ASTContext & getASTContext() const
Definition: Sema.h:1591
clang::LangOptions::AltivecSrcCompatKind::GCC
@ GCC
Diag
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.
Definition: LiteralSupport.cpp:78
argTypeIsABIEquivalent
static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType, ASTContext &Context)
Definition: SemaCast.cpp:1048
clang::TagDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:4307
SemaInternal.h
clang::OK_ObjCSubscript
@ OK_ObjCSubscript
An Objective-C array/dictionary subscripting which reads an object or writes at the subscripted array...
Definition: Specifiers.h:151
TryConstCast
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:1884
llvm::SmallVector
Definition: LLVM.h:38
clang::Sema::ACR_unbridged
@ ACR_unbridged
Definition: Sema.h:11966
clang::OverloadExpr::getQualifierLoc
NestedNameSpecifierLoc getQualifierLoc() const
Fetches the nested-name qualifier with source-location information, if one was given.
Definition: ExprCXX.h:3001
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::BuiltinType::Kind
Kind
Definition: Type.h:2495
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6455
clang::TargetCXXABI::isMicrosoft
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:138
clang::DiagnosticsEngine::isIgnored
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:909
TryReinterpretCast
static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2198
clang::SourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:219
TryStaticCast
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:1260
clang::OR_Success
@ OR_Success
Overload resolution succeeded.
Definition: Overload.h:53
TargetInfo.h
fixOverloadedReinterpretCastExpr
static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType, ExprResult &Result)
Definition: SemaCast.cpp:2170
clang::QualType::getNonReferenceType
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6624
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3524
CXXInheritance.h
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:324
TryLValueToRValueCast
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:1472
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:673
clang::Expr::getObjectKind
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:437
clang::Type::isScalarType
bool isScalarType() const
Definition: Type.h:7046
clang::Type::isMatrixType
bool isMatrixType() const
Definition: Type.h:6786
clang::Type::isFunctionNoProtoType
bool isFunctionNoProtoType() const
Definition: Type.h:2018
clang::Sema::AR_accessible
@ AR_accessible
Definition: Sema.h:7371
clang::InitializationSequence::Failed
bool Failed() const
Determine whether the initialization sequence is invalid.
Definition: Initialization.h:1214
clang::ASTRecordLayout::getBaseClassOffset
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:249
clang::CXXStaticCastExpr::Create
static CXXStaticCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *Path, TypeSourceInfo *Written, FPOptionsOverride FPO, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:708
clang::QualType::getCanonicalType
QualType getCanonicalType() const
Definition: Type.h:6467
clang::Sema::ActOnBuiltinBitCastExpr
ExprResult ActOnBuiltinBitCastExpr(SourceLocation KWLoc, Declarator &Dcl, ExprResult Operand, SourceLocation RParenLoc)
Definition: SemaCast.cpp:382
clang::Sema::CheckObjCConversion
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 ...
Definition: SemaExprObjC.cpp:4394
clang::Type::isFloatingType
bool isFloatingType() const
Definition: Type.cpp:2111
clang::Qualifiers
The collection of all-type qualifiers we support.
Definition: Type.h:145
clang::TargetInfo::getCXXABI
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1215
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID, bool DeferHint=false)
Emit a diagnostic.
Definition: Sema.cpp:1834
clang::Sema::CreateMaterializeTemporaryExpr
MaterializeTemporaryExpr * CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary, bool BoundToLvalueReference)
Definition: SemaInit.cpp:7935
clang::LangOptions::allowsNonTrivialObjCLifetimeQualifiers
bool allowsNonTrivialObjCLifetimeQualifiers() const
True if any ObjC types may have non-trivial lifetime qualifiers.
Definition: LangOptions.h:423
int
__device__ int
Definition: __clang_hip_libdevice_declares.h:63
ASTStructuralEquivalence.h
TryCastResult
TryCastResult
Definition: SemaCast.cpp:33
CT_CStyle
@ CT_CStyle
(Type)expr
Definition: SemaCast.cpp:51
CT_Static
@ CT_Static
static_cast
Definition: SemaCast.cpp:48
clang::Type::isRealFloatingType
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2127
clang::Sema::AR_dependent
@ AR_dependent
Definition: Sema.h:7373
clang::ASTContext::OverloadTy
CanQualType OverloadTy
Definition: ASTContext.h:1103
clang::RecordDecl::getDefinition
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:4073
clang::Sema::BuildBasePathArray
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath)
Definition: SemaDeclCXX.cpp:2875
clang::TypeLoc::getEndLoc
SourceLocation getEndLoc() const
Get the end source location.
Definition: TypeLoc.cpp:228
DiagnoseCallingConvCast
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:2056
clang::Expr::isPRValue
bool isPRValue() const
Definition: Expr.h:271
clang::MemberPointerType::isMemberFunctionPointer
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2851
clang::QualType::getAsString
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:1015
clang::TagType
Definition: Type.h:4589
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6959
clang::Sema::FixOverloadedFunctionReference
Expr * FixOverloadedFunctionReference(Expr *E, DeclAccessPair FoundDecl, FunctionDecl *Fn)
FixOverloadedFunctionReference - E is an expression that refers to a C++ overloaded function (possibl...
Definition: SemaOverload.cpp:15077
TryAddressSpaceCast
static TryCastResult TryAddressSpaceCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2545
clang::ASTContext::UnwrapSimilarArrayTypes
void UnwrapSimilarArrayTypes(QualType &T1, QualType &T2, bool AllowPiMismatch=true)
Attempt to unwrap two types that may both be array types with the same bound (or both be array types ...
Definition: ASTContext.cpp:5891
clang::Sema::CCK_FunctionalCast
@ CCK_FunctionalCast
A functional-style cast.
Definition: Sema.h:11465
clang::InitializationSequence::getFailureKind
FailureKind getFailureKind() const
Determine why initialization failed.
Definition: Initialization.h:1397
clang::Sema::DiscardMisalignedMemberAddress
void DiscardMisalignedMemberAddress(const Type *T, Expr *E)
This function checks if the expression is in the sef of potentially misaligned members and it is conv...
Definition: SemaChecking.cpp:16551
clang::Type::isRValueReferenceType
bool isRValueReferenceType() const
Definition: Type.h:6696
clang::InitializationSequence
Describes the sequence of initializations required to initialize a given object or reference with a s...
Definition: Initialization.h:789
DiagnoseCastOfObjCSEL
static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:2037
clang::IdentifierInfo::getTokenID
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
Definition: IdentifierTable.h:261
clang::Qualifiers::compatiblyIncludes
bool compatiblyIncludes(Qualifiers other) const
Determines if these qualifiers compatibly include another set.
Definition: Type.h:515
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3546
clang::Sema::BuildCXXFunctionalCastExpr
ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type, SourceLocation LParenLoc, Expr *CastExpr, SourceLocation RParenLoc)
Definition: SemaCast.cpp:3248
clang::Qualifiers::hasConst
bool hasConst() const
Definition: Type.h:262
clang::Sema::CheckCastAlign
void CheckCastAlign(Expr *Op, QualType T, SourceRange TRange)
CheckCastAlign - Implements -Wcast-align, which warns when a pointer cast increases the alignment req...
Definition: SemaChecking.cpp:14979
clang::CXXAddrspaceCastExpr::Create
static CXXAddrspaceCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind Kind, Expr *Op, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:830
clang::Qualifiers::compatiblyIncludesObjCLifetime
bool compatiblyIncludesObjCLifetime(Qualifiers other) const
Determines if these qualifiers compatibly include another set of qualifiers from the narrow perspecti...
Definition: Type.h:536
clang::Expr::isGLValue
bool isGLValue() const
Definition: Expr.h:273
clang::Sema::AR_delayed
@ AR_delayed
Definition: Sema.h:7374
clang::CXXFunctionalCastExpr::Create
static CXXFunctionalCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, TypeSourceInfo *Written, CastKind Kind, Expr *Op, const CXXCastPath *Path, FPOptionsOverride FPO, SourceLocation LPLoc, SourceLocation RPLoc)
Definition: ExprCXX.cpp:842
clang::Sema::CCK_OtherCast
@ CCK_OtherCast
A cast other than a C-style cast.
Definition: Sema.h:11467
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:410
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1490
Preprocessor.h
clang::Sema::GetTypeForDeclaratorCast
TypeSourceInfo * GetTypeForDeclaratorCast(Declarator &D, QualType FromTy)
Definition: SemaType.cpp:5872
diagnoseBadCast
static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType, SourceRange opRange, Expr *src, QualType destType, bool listInitialization)
Diagnose a failed cast.
Definition: SemaCast.cpp:493
clang::ExprError
ExprResult ExprError()
Definition: Ownership.h:278
clang::Sema::ResolveAddressOfOverloadedFunction
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....
Definition: SemaOverload.cpp:12345
clang::ASTContext::ARCUnbridgedCastTy
CanQualType ARCUnbridgedCastTy
Definition: ASTContext.h:1105
clang::OverloadExpr::find
static FindResult find(Expr *E)
Finds the overloaded expression in the given expression E of OverloadTy.
Definition: ExprCXX.h:2940
clang::Type::containsErrors
bool containsErrors() const
Whether this type is an error type.
Definition: Type.h:2168
clang::Type::isExtVectorType
bool isExtVectorType() const
Definition: Type.h:6782
Offset
unsigned Offset
Definition: Format.cpp:2381
clang::QualType::isAddressSpaceOverlapping
bool isAddressSpaceOverlapping(QualType T) const
Returns true if address space qualifiers overlap with T address space qualifiers.
Definition: Type.h:1099
clang::CXXBasePaths::const_paths_iterator
std::list< CXXBasePath >::const_iterator const_paths_iterator
Definition: CXXInheritance.h:172
clang::Sema::getAmbiguousPathsDisplayString
std::string getAmbiguousPathsDisplayString(CXXBasePaths &Paths)
Builds a string representing ambiguous paths from a specific derived class to different subobjects of...
Definition: SemaDeclCXX.cpp:2999
clang::TypeLoc::getBeginLoc
SourceLocation getBeginLoc() const
Get the begin source location.
Definition: TypeLoc.cpp:191
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1584
clang::ReferenceType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2769
APSInt
llvm::APSInt APSInt
Definition: ByteCodeEmitter.cpp:19
clang::QualType::isAtLeastAsQualifiedAs
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:6605
getCastAwayConstnessCastKind
static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK, unsigned &DiagID)
Definition: SemaCast.cpp:733
clang::Sema::RequireCompleteType
bool RequireCompleteType(SourceLocation Loc, QualType T, CompleteTypeKind Kind, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:8467
clang::Sema::CheckTollFreeBridgeStaticCast
bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, CastKind &Kind)
Definition: SemaExprObjC.cpp:4208
clang::InitializationSequence::getFailedOverloadResult
OverloadingResult getFailedOverloadResult() const
Get the overloading result, for when the initialization sequence failed due to a bad overload.
Definition: Initialization.h:1385
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6688
TC_Extension
@ TC_Extension
The cast method is appropriate and accepted as a language extension.
Definition: SemaCast.cpp:36
clang::Expr::isTypeDependent
bool isTypeDependent() const
Determines whether the type of this expression depends on.
Definition: Expr.h:185
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4613
clang::Sema::BuildCXXNamedCast
ExprResult BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, TypeSourceInfo *Ty, Expr *E, SourceRange AngleBrackets, SourceRange Parens)
Definition: SemaCast.cpp:296
clang::OverloadExpr::getName
DeclarationName getName() const
Gets the name looked up.
Definition: ExprCXX.h:2989
clang::ASTContext::removeAddrSpaceQualType
QualType removeAddrSpaceQualType(QualType T) const
Remove any existing address space on the type and returns the type with qualifiers intact (or that's ...
Definition: ASTContext.cpp:3022
clang::OCD_ViableCandidates
@ OCD_ViableCandidates
Requests that only viable candidates be shown.
Definition: Overload.h:71
DiagnoseReinterpretUpDownCast
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:957
clang::PartialDiagnosticAt
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs.
Definition: PartialDiagnostic.h:208
clang::QualType::getNonLValueExprType
QualType getNonLValueExprType(const ASTContext &Context) const
Determine the type of a (typically non-lvalue) expression with the specified result type.
Definition: Type.cpp:3129
clang::Sema::CurFPFeatureOverrides
FPOptionsOverride CurFPFeatureOverrides()
Definition: Sema.h:697
clang::Type::isMemberFunctionPointerType
bool isMemberFunctionPointerType() const
Definition: Type.h:6728
clang::Sema::CheckMatrixCast
bool CheckMatrixCast(SourceRange R, QualType DestTy, QualType SrcTy, CastKind &Kind)
Definition: SemaExpr.cpp:7524
clang::QualType::getAddressSpace
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:6549
clang::Sema::Ref_Incompatible
@ Ref_Incompatible
Ref_Incompatible - The two types are incompatible, so direct reference binding is not possible.
Definition: Sema.h:11891
clang::ASTContext::getDefaultCallingConvention
CallingConv getDefaultCallingConvention(bool IsVariadic, bool IsCXXMethod, bool IsBuiltin=false) const
Retrieves the default calling convention for the current target.
Definition: ASTContext.cpp:11168
TryStaticReferenceDowncast
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:1527
clang::Type::isNullPtrType
bool isNullPtrType() const
Definition: Type.h:6984
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:6223
clang::Type::isAnyCharacterType
bool isAnyCharacterType() const
Determine whether this type is any of the built-in character types.
Definition: Type.cpp:1992
clang::Sema::RequireNonAbstractType
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Definition: SemaDeclCXX.cpp:5727
clang::Type::isFunctionPointerType
bool isFunctionPointerType() const
Definition: Type.h:6710
clang::threadSafety::sx::toString
std::string toString(const til::SExpr *E)
Definition: ThreadSafetyCommon.h:89
clang::DeclAccessPair
A POD class for pairing a NamedDecl* with an access specifier.
Definition: DeclAccessPair.h:29
clang::VectorType
Represents a GCC generic vector type.
Definition: Type.h:3229
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:212
clang::CPlusPlus
@ CPlusPlus
Definition: LangStandard.h:48
TC_NotApplicable
@ TC_NotApplicable
The cast method is not applicable.
Definition: SemaCast.cpp:34
clang::MemberPointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2847
clang::Qualifiers::getCVRQualifiers
unsigned getCVRQualifiers() const
Definition: Type.h:278
clang::Qualifiers::removeConst
void removeConst()
Definition: Type.h:264
clang::NestedNameSpecifierLoc::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Retrieve the source range covering the entirety of this nested-name-specifier.
Definition: NestedNameSpecifier.cpp:410
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:7165
clang::Type::isComplexType
bool isComplexType() const
isComplexType() does not include complex integers (a GCC extension).
Definition: Type.cpp:601
clang::OK_BitField
@ OK_BitField
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:139
clang::Decl::isInvalidDecl
bool isInvalidDecl() const
Definition: DeclBase.h:558
clang::BuiltinBitCastExpr
Represents a C++2a __builtin_bit_cast(T, v) expression.
Definition: ExprCXX.h:4875
clang::OCD_AmbiguousCandidates
@ OCD_AmbiguousCandidates
Requests that only tied-for-best candidates be shown.
Definition: Overload.h:74
clang::Sema::ShouldSplatAltivecScalarInCast
bool ShouldSplatAltivecScalarInCast(const VectorType *VecTy)
Definition: SemaCast.cpp:2629
clang::FunctionType::getCallConv
CallingConv getCallConv() const
Definition: Type.h:3820
clang::Sema::Diags
DiagnosticsEngine & Diags
Definition: Sema.h:412
clang::Type::isVectorType
bool isVectorType() const
Definition: Type.h:6778
clang::Type::getPointeeCXXRecordDecl
const CXXRecordDecl * getPointeeCXXRecordDecl() const
If this is a pointer or reference to a RecordType, return the CXXRecordDecl that the type refers to.
Definition: Type.cpp:1745
CastsAwayConstness
static CastAwayConstnessKind CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType, bool CheckCVR, bool CheckObjCLifetime, QualType *TheOffendingSrcType=nullptr, QualType *TheOffendingDestType=nullptr, Qualifiers *CastAwayQualifiers=nullptr)
Check if the pointer conversion from SrcType to DestType casts away constness as defined in C++ [expr...
Definition: SemaCast.cpp:638
unwrapCastAwayConstnessLevel
static CastAwayConstnessKind unwrapCastAwayConstnessLevel(ASTContext &Context, QualType &T1, QualType &T2)
Unwrap one level of types for CastsAwayConstness.
Definition: SemaCast.cpp:560
DiagnoseCastQual
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:3186
CastType
CastType
Definition: SemaCast.cpp:46
clang::Sema::areLaxCompatibleVectorTypes
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:7480
clang::Type::isLValueReferenceType
bool isLValueReferenceType() const
Definition: Type.h:6692
clang::Sema::PDiag
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:24
clang::ASTContext::getTypeSize
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2251
clang::Stmt::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:348
clang::InitializationSequence::getFailedCandidateSet
OverloadCandidateSet & getFailedCandidateSet()
Retrieve a reference to the candidate set when overload resolution fails.
Definition: Initialization.h:1379
clang::ImplicitCastExpr::Create
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat, FPOptionsOverride FPO)
Definition: Expr.cpp:1996
clang::Sema::BuildCStyleCastExpr
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty, SourceLocation RParenLoc, Expr *Op)
Definition: SemaCast.cpp:3222
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6672
clang::CXXBasePathElement
Represents an element in a path from a derived class to a base class.
Definition: CXXInheritance.h:44
clang::ASTContext::UnwrapSimilarTypes
bool UnwrapSimilarTypes(QualType &T1, QualType &T2, bool AllowPiMismatch=true)
Attempt to unwrap two types that may be similar (C++ [conv.qual]).
Definition: ASTContext.cpp:5942
llvm::SmallString
Definition: LLVM.h:37
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:606
clang::CXXConstCastExpr::Create
static CXXConstCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, Expr *Op, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:816
clang::TypeInfoChars::Width
CharUnits Width
Definition: ASTContext.h:197
ASTContext.h
clang::Sema::ReferenceCompareResult
ReferenceCompareResult
ReferenceCompareResult - Expresses the result of comparing two types (cv1 T1 and cv2 T2) to determine...
Definition: Sema.h:11888
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:263
clang::Type::getPointeeType
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:625
clang::ASTContext::getCanonicalType
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2474
clang::CXXRecordDecl::isDerivedFrom
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
Definition: CXXInheritance.cpp:68
clang::Type::getAsCXXRecordDecl
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1760
clang::TagDecl::isUnion
bool isUnion() const
Definition: Decl.h:3521
CT_Functional
@ CT_Functional
Type(expr)
Definition: SemaCast.cpp:52
clang::OR_Deleted
@ OR_Deleted
Succeeded, but refers to a deleted function.
Definition: Overload.h:62
clang::Sema::BuildBuiltinBitCastExpr
ExprResult BuildBuiltinBitCastExpr(SourceLocation KWLoc, TypeSourceInfo *TSI, Expr *Operand, SourceLocation RParenLoc)
Definition: SemaCast.cpp:394
clang::MemberPointerType::getClass
const Type * getClass() const
Definition: Type.h:2861
ExprObjC.h
clang::CharUnits::Zero
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
clang::CanQual
Represents a canonical, potentially-qualified type.
Definition: CanonicalType.h:65
ExprCXX.h
clang::Sema::isValidSveBitcast
bool isValidSveBitcast(QualType srcType, QualType destType)
Are the two types SVE-bitcast-compatible types? I.e.
Definition: SemaExpr.cpp:7425
clang::Type::getAsPlaceholderType
const BuiltinType * getAsPlaceholderType() const
Definition: Type.h:6941
clang::TagDecl::isCompleteDefinition
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3438
clang::Type::isEnumeralType
bool isEnumeralType() const
Definition: Type.h:6770
clang::VectorType::AltiVecPixel
@ AltiVecPixel
is AltiVec 'vector Pixel'
Definition: Type.h:3239
clang::CastExpr::getTargetFieldForToUnionCast
static const FieldDecl * getTargetFieldForToUnionCast(QualType unionType, QualType opType)
Definition: Expr.cpp:1956
clang::Sema::CheckAltivecInitFromScalar
bool CheckAltivecInitFromScalar(SourceRange R, QualType VecTy, QualType SrcTy)
Definition: SemaCast.cpp:2642
clang::OK_MatrixComponent
@ OK_MatrixComponent
A matrix component is a single element of a matrix.
Definition: Specifiers.h:154
CT_Reinterpret
@ CT_Reinterpret
reinterpret_cast
Definition: SemaCast.cpp:49
clang::OverloadCandidateSet::NoteCandidates
void NoteCandidates(PartialDiagnosticAt PA, Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef< Expr * > Args, StringRef Opc="", SourceLocation Loc=SourceLocation(), llvm::function_ref< bool(OverloadCandidate &)> Filter=[](OverloadCandidate &) { return true;})
When overload resolution fails, prints diagnostic messages containing the candidates in the candidate...
Definition: SemaOverload.cpp:11723
clang::VectorType::getVectorKind
VectorKind getVectorKind() const
Definition: Type.h:3276
clang::Sema::LangOpts
const LangOptions & LangOpts
Definition: Sema.h:408
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6508
clang::Type::isObjCLifetimeType
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:4311
clang::Type::isObjCObjectPointerType
bool isObjCObjectPointerType() const
Definition: Type.h:6798
TryStaticPointerDowncast
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:1565
checkCastFunctionType
static bool checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:1062
clang::IdentifierInfo::isKeyword
bool isKeyword(const LangOptions &LangOpts) const
Return true if this token is a keyword in the specified language.
Definition: IdentifierTable.cpp:255
clang::CXXBasePaths::end
paths_iterator end()
Definition: CXXInheritance.h:183
clang::QualType::withCVRQualifiers
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:865
clang::OverloadCandidateSet
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13....
Definition: Overload.h:936
clang::OCD_AllCandidates
@ OCD_AllCandidates
Requests that all candidates be shown.
Definition: Overload.h:68
IsAddressSpaceConversion
static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType)
Definition: SemaCast.cpp:1246
clang::Qualifiers::isAddressSpaceSupersetOf
static bool isAddressSpaceSupersetOf(LangAS A, LangAS B)
Returns true if address space A is equal to or a superset of B.
Definition: Type.h:478
clang::Type::isArithmeticType
bool isArithmeticType() const
Definition: Type.cpp:2142
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7230
clang::ASTRecordLayout
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
clang::InitializationSequence::Perform
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:7987
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:255
clang::tok::TokenKind
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
checkIntToPointerCast
static void checkIntToPointerCast(bool CStyle, const SourceRange &OpRange, const Expr *SrcExpr, QualType DestType, Sema &Self)
Definition: SemaCast.cpp:2144
clang::Type::isDependentType
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2174
clang::VK_PRValue
@ VK_PRValue
A pr-value expression (in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:120
clang::FunctionType::getNameForCallConv
static StringRef getNameForCallConv(CallingConv CC)
Definition: Type.cpp:3145
clang::VectorType::AltiVecVector
@ AltiVecVector
is AltiVec vector
Definition: Type.h:3236
clang::QualType::isTriviallyCopyableType
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2458
clang::Sema::IsDerivedFrom
bool IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base)
Determine whether the type Derived is a C++ class that is derived from the type Base.
Definition: SemaDeclCXX.cpp:2810
clang::Type::isMemberPointerType
bool isMemberPointerType() const
Definition: Type.h:6724
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6676
clang::OR_No_Viable_Function
@ OR_No_Viable_Function
No viable function found.
Definition: Overload.h:56
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:169
clang::OverloadCandidateDisplayKind
OverloadCandidateDisplayKind
Definition: Overload.h:65
tryDiagnoseOverloadedCast
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:416
clang::ASTContext::getUnqualifiedArrayType
QualType getUnqualifiedArrayType(QualType T, Qualifiers &Quals)
Return this type as a completely-unqualified array type, capturing the qualifiers in Quals.
Definition: ASTContext.cpp:5829
clang::ast_matchers::castExpr
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang's AST.
Definition: ASTMatchersInternal.cpp:975
clang::Sema::ResolveAndFixSingleFunctionTemplateSpecialization
bool ResolveAndFixSingleFunctionTemplateSpecialization(ExprResult &SrcExpr, bool DoFunctionPointerConverion=false, bool Complain=false, SourceRange OpRangeForComplaining=SourceRange(), QualType DestTypeForComplaining=QualType(), unsigned DiagIDForComplaining=0)
Definition: SemaOverload.cpp:12585
clang::Type::isComplexIntegerType
bool isComplexIntegerType() const
Definition: Type.cpp:607
clang::Sema::CCK_CStyleCast
@ CCK_CStyleCast
A C-style cast.
Definition: Sema.h:11463
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3885
clang::Expr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:229
clang::VectorType::VectorKind
VectorKind
Definition: Type.h:3231
clang::CXXReinterpretCastExpr::Create
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:793
clang::Type::isSizelessBuiltinType
bool isSizelessBuiltinType() const
Definition: Type.cpp:2295
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:738
clang::Type::isBFloat16Type
bool isBFloat16Type() const
Definition: Type.h:6972
clang::Sema::AR_inaccessible
@ AR_inaccessible
Definition: Sema.h:7372
clang::InitializationKind::CreateFunctionalCast
static InitializationKind CreateFunctionalCast(SourceRange TypeRange, bool InitList)
Create a direct initialization for a functional cast.
Definition: Initialization.h:666
clang::TypeLoc
Base wrapper for a particular "section" of type source info.
Definition: TypeLoc.h:58
clang::Expr::IgnoreParenImpCasts
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2916
clang::InitializationSequence::isConstructorInitialization
bool isConstructorInitialization() const
Determine whether this initialization is direct call to a constructor.
Definition: SemaInit.cpp:3565
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:354
clang::ActionResult::isInvalid
bool isInvalid() const
Definition: Ownership.h:165
TryStaticImplicitCast
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:1829
clang::Sema::CheckExtraCXXDefaultArguments
void CheckExtraCXXDefaultArguments(Declarator &D)
CheckExtraCXXDefaultArguments - Check for any extra default arguments in the declarator,...
Definition: SemaDeclCXX.cpp:393
clang::LangOptions::AltivecSrcCompatKind::XL
@ XL
clang::Sema::resolveAndFixAddressOfSingleOverloadCandidate
bool resolveAndFixAddressOfSingleOverloadCandidate(ExprResult &SrcExpr, bool DoFunctionPointerConversion=false)
Given an overloaded function, tries to turn it into a non-overloaded function reference using resolve...
Definition: SemaOverload.cpp:12467
clang::InitializationSequence::FK_ConstructorOverloadFailed
@ FK_ConstructorOverloadFailed
Overloading for initialization by constructor failed.
Definition: Initialization.h:1076
clang::Declarator::isInvalidType
bool isInvalidType() const
Definition: DeclSpec.h:2558
clang::OR_Ambiguous
@ OR_Ambiguous
Ambiguous candidates found.
Definition: Overload.h:59
clang::Type::isSignedIntegerType
bool isSignedIntegerType() const
Return true if this is an integer type that is signed, according to C99 6.2.5p4 [char,...
Definition: Type.cpp:2013
clang::OverloadExpr
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr.
Definition: ExprCXX.h:2880
clang::CXXDynamicCastExpr::Create
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:734
clang::Qualifiers::hasVolatile
bool hasVolatile() const
Definition: Type.h:267
CT_Const
@ CT_Const
const_cast
Definition: SemaCast.cpp:47
clang::OK_VectorComponent
@ OK_VectorComponent
A vector component is an element or range of elements on a vector.
Definition: Specifiers.h:142
clang::Type::isPlaceholderType
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:6935
clang::ExprValueKind
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:117
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:84
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:747
clang::VectorType::AltiVecBool
@ AltiVecBool
is AltiVec 'vector bool ...'
Definition: Type.h:3242
clang::Qualifiers::removeObjCGCAttr
void removeObjCGCAttr()
Definition: Type.h:313
clang::Sema::ActOnCXXNamedCast
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,addrspace}_cast's.
Definition: SemaCast.cpp:273
clang::Type::isBooleanType
bool isBooleanType() const
Definition: Type.h:7075
clang::MemberPointerType
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2831
clang::ObjCPropertyAttribute::Kind
Kind
Definition: DeclObjCCommon.h:22
TryStaticMemberPointerUpcast
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:1711
clang::InitializationKind
Describes the kind of initialization being performed, along with location information for tokens rela...
Definition: Initialization.h:567
clang::ActionResult< Expr * >
clang::Type::isObjCObjectType
bool isObjCObjectType() const
Definition: Type.h:6802
clang::Sema::getPreprocessor
Preprocessor & getPreprocessor() const
Definition: Sema.h:1590
DiagnoseBadFunctionCast
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:2812
clang::Sema::ReferenceConversionsScope::ReferenceConversions
ReferenceConversions
The conversions that would be performed on an lvalue of type T2 when binding a reference of type T1 t...
Definition: Sema.h:11905
clang::RValueReferenceType
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2813
CT_Dynamic
@ CT_Dynamic
dynamic_cast
Definition: SemaCast.cpp:50
clang::OK_ObjCProperty
@ OK_ObjCProperty
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:146
clang::Type::isEventT
bool isEventT() const
Definition: Type.h:6867
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2640
clang::Type::isHalfType
bool isHalfType() const
Definition: Type.h:6963
clang::CanQual::getUnqualifiedType
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
Definition: CanonicalType.h:620
clang::Sema::AA_Casting
@ AA_Casting
Definition: Sema.h:3437
clang::CXXBasePath
Represents a path from a specific derived class (which is not represented as part of the path) to a p...
Definition: CXXInheritance.h:70
PartialDiagnostic.h
clang
Definition: CalledOnceCheck.h:17
clang::Type::isAnyPointerType
bool isAnyPointerType() const
Definition: Type.h:6680
clang::transformer::range
RangeSelector range(RangeSelector Begin, RangeSelector End)
DEPRECATED. Use enclose.
Definition: RangeSelector.h:41
clang::Declarator
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1804
clang::OverloadExpr::FindResult::Expression
OverloadExpr * Expression
Definition: ExprCXX.h:2930
clang::Expr::isIntegerConstantExpr
bool isIntegerConstantExpr(const ASTContext &Ctx, SourceLocation *Loc=nullptr) const
Definition: ExprConstant.cpp:15490
clang::ASTContext::hasCvrSimilarType
bool hasCvrSimilarType(QualType T1, QualType T2)
Determine if two types are similar, ignoring only CVR qualifiers.
Definition: ASTContext.cpp:5991
clang::Sema::isCompleteType
bool isCompleteType(SourceLocation Loc, QualType T, CompleteTypeKind Kind=CompleteTypeKind::Default)
Definition: Sema.h:2299
clang::Expr::getType
QualType getType() const
Definition: Expr.h:141
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:110
clang::DeclaratorContext::FunctionalCast
@ FunctionalCast
clang::TypeSourceInfo
A container of type source information.
Definition: Type.h:6399
clang::FunctionType::getReturnType
QualType getReturnType() const
Definition: Type.h:3809
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:336
CT_Addrspace
@ CT_Addrspace
addrspace_cast
Definition: SemaCast.cpp:53
clang::InitializedEntity
Describes an entity that is being initialized.
Definition: Initialization.h:48
clang::Qualifiers::removeObjCLifetime
void removeObjCLifetime()
Definition: Type.h:341
clang::ASTContext::getASTRecordLayout
const ASTRecordLayout & getASTRecordLayout(const RecordDecl *D) const
Get or compute information about the layout of the specified record (struct/union/class) D,...
Definition: RecordLayoutBuilder.cpp:3246
clang::TypeLoc::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:152
clang::CXXBasePaths
BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
Definition: CXXInheritance.h:117
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6428
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4623
clang::InitializationSequence::FK_UserConversionOverloadFailed
@ FK_UserConversionOverloadFailed
Overloading for a user-defined conversion failed.
Definition: Initialization.h:1073
clang::CanQual::getAs
CanProxy< U > getAs() const
Retrieve a canonical type pointer with a different static type, upcasting or downcasting as needed.
Definition: CanonicalType.h:653
clang::InitializedEntity::InitializeTemporary
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
Definition: Initialization.h:333
clang::ASTContext::getPointerType
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
Definition: ASTContext.cpp:3249
clang::ReferenceType
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2751
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::PointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2650
clang::ASTContext::getTypeInfoInChars
TypeInfoChars getTypeInfoInChars(const Type *T) const
Definition: ASTContext.cpp:1874
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2490
clang::Expr::refersToBitField
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:462
clang::CanQual::isAtLeastAsQualifiedAs
bool isAtLeastAsQualifiedAs(CanQual< T > Other) const
Determines whether this canonical type is at least as qualified as the Other canonical type.
Definition: CanonicalType.h:173
clang::InitializationKind::CreateCast
static InitializationKind CreateCast(SourceRange TypeRange)
Create a direct initialization due to a cast that isn't a C-style or functional cast.
Definition: Initialization.h:649
clang::Type::isFixedPointType
bool isFixedPointType() const
Return true if this is a fixed point type according to ISO/IEC JTC1 SC22 WG14 N1169.
Definition: Type.h:7004
clang::Sema::areVectorTypesSameSize
bool areVectorTypesSameSize(QualType srcType, QualType destType)
Definition: SemaExpr.cpp:7454
TC_Failed
@ TC_Failed
The cast method is appropriate, but failed.
Definition: SemaCast.cpp:38
clang::Sema::CheckCompatibleReinterpretCast
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType, bool IsDereference, SourceRange Range)
Definition: SemaCast.cpp:1987
clang::CastKind
CastKind
CastKind - The kind of operation required for a conversion.
Definition: OperationKinds.h:20
clang::Type::isIntegerType
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6991
clang::Type::isFunctionReferenceType
bool isFunctionReferenceType() const
Definition: Type.h:6717
clang::ASTContext::hasSameUnqualifiedType
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2514
clang::Expr
This represents one expression.
Definition: Expr.h:109
clang::Expr::getValueKindForType
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:420
clang::Preprocessor
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:130
clang::CXXBasePaths::begin
paths_iterator begin()
Definition: CXXInheritance.h:182
clang::Type::isUnsignedIntegerType
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:2063
clang::EnumType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums.
Definition: Type.h:4639
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3473
clang::Sema::CheckedConversionKind
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:11459
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1857
clang::Sema::Ref_Compatible
@ Ref_Compatible
Ref_Compatible - The two types are reference-compatible.
Definition: Sema.h:11897
clang::RecordDecl
Represents a struct/union/class.
Definition: Decl.h:3868
clang::OverloadCandidateSet::empty
bool empty() const
Definition: Overload.h:1110
clang::ActionResult::isUsable
bool isUsable() const
Definition: Ownership.h:166
clang::Type::isIncompleteOrObjectType
bool isIncompleteOrObjectType() const
Return true if this is an incomplete or object type, in other words, not a function type.
Definition: Type.h:1927
clang::MatrixType
Represents a matrix type, as defined in the Matrix Types clang extensions.
Definition: Type.h:3419
clang::ASTContext::getLangOpts
const LangOptions & getLangOpts() const
Definition: ASTContext.h:765
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
clang::InitializationKind::CreateCStyleCast
static InitializationKind CreateCStyleCast(SourceLocation StartLoc, SourceRange TypeRange, bool InitList)
Create a direct initialization for a C-style cast.
Definition: Initialization.h:655
clang::Preprocessor::getIdentifierInfo
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Definition: Preprocessor.h:1243
clang::FixItHint::CreateReplacement
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:133
clang::Sema::PrepareCastToObjCObjectPointer
CastKind PrepareCastToObjCObjectPointer(ExprResult &E)
Prepare a conversion of the given expression to an ObjC object pointer type.
Definition: SemaExpr.cpp:7178
clang::Type::isIntegralOrEnumerationType
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:7062
RecordLayout.h
clang::Sema::CheckBaseClassAccess
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.
Definition: SemaAccess.cpp:1842
clang::ASTContext::getMemberPointerType
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 ...
Definition: ASTContext.cpp:3442
clang::CStyleCastExpr::Create
static CStyleCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, CastKind K, Expr *Op, const CXXCastPath *BasePath, FPOptionsOverride FPO, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation R)
Definition: Expr.cpp:2027
clang::TypeSourceInfo::getTypeLoc
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:244
Initialization.h
clang::CXXMethodDecl::getParent
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined.
Definition: DeclCXX.h:2063
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1948