clang  17.0.0git
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 
455  break;
456  }
457 
458  OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
459 
460  unsigned msg = 0;
462 
463  switch (sequence.getFailedOverloadResult()) {
464  case OR_Success: llvm_unreachable("successful failed overload");
466  if (candidates.empty())
467  msg = diag::err_ovl_no_conversion_in_cast;
468  else
469  msg = diag::err_ovl_no_viable_conversion_in_cast;
470  howManyCandidates = OCD_AllCandidates;
471  break;
472 
473  case OR_Ambiguous:
474  msg = diag::err_ovl_ambiguous_conversion_in_cast;
475  howManyCandidates = OCD_AmbiguousCandidates;
476  break;
477 
478  case OR_Deleted:
479  msg = diag::err_ovl_deleted_conversion_in_cast;
480  howManyCandidates = OCD_ViableCandidates;
481  break;
482  }
483 
484  candidates.NoteCandidates(
485  PartialDiagnosticAt(range.getBegin(),
486  S.PDiag(msg) << CT << srcType << destType << range
487  << src->getSourceRange()),
488  S, howManyCandidates, src);
489 
490  return true;
491 }
492 
493 /// Diagnose a failed cast.
494 static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
495  SourceRange opRange, Expr *src, QualType destType,
496  bool listInitialization) {
497  if (msg == diag::err_bad_cxx_cast_generic &&
498  tryDiagnoseOverloadedCast(S, castType, opRange, src, destType,
499  listInitialization))
500  return;
501 
502  S.Diag(opRange.getBegin(), msg) << castType
503  << src->getType() << destType << opRange << src->getSourceRange();
504 
505  // Detect if both types are (ptr to) class, and note any incompleteness.
506  int DifferentPtrness = 0;
507  QualType From = destType;
508  if (auto Ptr = From->getAs<PointerType>()) {
509  From = Ptr->getPointeeType();
510  DifferentPtrness++;
511  }
512  QualType To = src->getType();
513  if (auto Ptr = To->getAs<PointerType>()) {
514  To = Ptr->getPointeeType();
515  DifferentPtrness--;
516  }
517  if (!DifferentPtrness) {
518  auto RecFrom = From->getAs<RecordType>();
519  auto RecTo = To->getAs<RecordType>();
520  if (RecFrom && RecTo) {
521  auto DeclFrom = RecFrom->getAsCXXRecordDecl();
522  if (!DeclFrom->isCompleteDefinition())
523  S.Diag(DeclFrom->getLocation(), diag::note_type_incomplete) << DeclFrom;
524  auto DeclTo = RecTo->getAsCXXRecordDecl();
525  if (!DeclTo->isCompleteDefinition())
526  S.Diag(DeclTo->getLocation(), diag::note_type_incomplete) << DeclTo;
527  }
528  }
529 }
530 
531 namespace {
532 /// The kind of unwrapping we did when determining whether a conversion casts
533 /// away constness.
534 enum CastAwayConstnessKind {
535  /// The conversion does not cast away constness.
536  CACK_None = 0,
537  /// We unwrapped similar types.
538  CACK_Similar = 1,
539  /// We unwrapped dissimilar types with similar representations (eg, a pointer
540  /// versus an Objective-C object pointer).
541  CACK_SimilarKind = 2,
542  /// We unwrapped representationally-unrelated types, such as a pointer versus
543  /// a pointer-to-member.
544  CACK_Incoherent = 3,
545 };
546 }
547 
548 /// Unwrap one level of types for CastsAwayConstness.
549 ///
550 /// Like Sema::UnwrapSimilarTypes, this removes one level of indirection from
551 /// both types, provided that they're both pointer-like or array-like. Unlike
552 /// the Sema function, doesn't care if the unwrapped pieces are related.
553 ///
554 /// This function may remove additional levels as necessary for correctness:
555 /// the resulting T1 is unwrapped sufficiently that it is never an array type,
556 /// so that its qualifiers can be directly compared to those of T2 (which will
557 /// have the combined set of qualifiers from all indermediate levels of T2),
558 /// as (effectively) required by [expr.const.cast]p7 replacing T1's qualifiers
559 /// with those from T2.
560 static CastAwayConstnessKind
562  enum { None, Ptr, MemPtr, BlockPtr, Array };
563  auto Classify = [](QualType T) {
564  if (T->isAnyPointerType()) return Ptr;
565  if (T->isMemberPointerType()) return MemPtr;
566  if (T->isBlockPointerType()) return BlockPtr;
567  // We somewhat-arbitrarily don't look through VLA types here. This is at
568  // least consistent with the behavior of UnwrapSimilarTypes.
569  if (T->isConstantArrayType() || T->isIncompleteArrayType()) return Array;
570  return None;
571  };
572 
573  auto Unwrap = [&](QualType T) {
574  if (auto *AT = Context.getAsArrayType(T))
575  return AT->getElementType();
576  return T->getPointeeType();
577  };
578 
579  CastAwayConstnessKind Kind;
580 
581  if (T2->isReferenceType()) {
582  // Special case: if the destination type is a reference type, unwrap it as
583  // the first level. (The source will have been an lvalue expression in this
584  // case, so there is no corresponding "reference to" in T1 to remove.) This
585  // simulates removing a "pointer to" from both sides.
586  T2 = T2->getPointeeType();
587  Kind = CastAwayConstnessKind::CACK_Similar;
588  } else if (Context.UnwrapSimilarTypes(T1, T2)) {
589  Kind = CastAwayConstnessKind::CACK_Similar;
590  } else {
591  // Try unwrapping mismatching levels.
592  int T1Class = Classify(T1);
593  if (T1Class == None)
594  return CastAwayConstnessKind::CACK_None;
595 
596  int T2Class = Classify(T2);
597  if (T2Class == None)
598  return CastAwayConstnessKind::CACK_None;
599 
600  T1 = Unwrap(T1);
601  T2 = Unwrap(T2);
602  Kind = T1Class == T2Class ? CastAwayConstnessKind::CACK_SimilarKind
603  : CastAwayConstnessKind::CACK_Incoherent;
604  }
605 
606  // We've unwrapped at least one level. If the resulting T1 is a (possibly
607  // multidimensional) array type, any qualifier on any matching layer of
608  // T2 is considered to correspond to T1. Decompose down to the element
609  // type of T1 so that we can compare properly.
610  while (true) {
611  Context.UnwrapSimilarArrayTypes(T1, T2);
612 
613  if (Classify(T1) != Array)
614  break;
615 
616  auto T2Class = Classify(T2);
617  if (T2Class == None)
618  break;
619 
620  if (T2Class != Array)
621  Kind = CastAwayConstnessKind::CACK_Incoherent;
622  else if (Kind != CastAwayConstnessKind::CACK_Incoherent)
623  Kind = CastAwayConstnessKind::CACK_SimilarKind;
624 
625  T1 = Unwrap(T1);
626  T2 = Unwrap(T2).withCVRQualifiers(T2.getCVRQualifiers());
627  }
628 
629  return Kind;
630 }
631 
632 /// Check if the pointer conversion from SrcType to DestType casts away
633 /// constness as defined in C++ [expr.const.cast]. This is used by the cast
634 /// checkers. Both arguments must denote pointer (possibly to member) types.
635 ///
636 /// \param CheckCVR Whether to check for const/volatile/restrict qualifiers.
637 /// \param CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.
638 static CastAwayConstnessKind
639 CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType,
640  bool CheckCVR, bool CheckObjCLifetime,
641  QualType *TheOffendingSrcType = nullptr,
642  QualType *TheOffendingDestType = nullptr,
643  Qualifiers *CastAwayQualifiers = nullptr) {
644  // If the only checking we care about is for Objective-C lifetime qualifiers,
645  // and we're not in ObjC mode, there's nothing to check.
646  if (!CheckCVR && CheckObjCLifetime && !Self.Context.getLangOpts().ObjC)
647  return CastAwayConstnessKind::CACK_None;
648 
649  if (!DestType->isReferenceType()) {
650  assert((SrcType->isAnyPointerType() || SrcType->isMemberPointerType() ||
651  SrcType->isBlockPointerType()) &&
652  "Source type is not pointer or pointer to member.");
653  assert((DestType->isAnyPointerType() || DestType->isMemberPointerType() ||
654  DestType->isBlockPointerType()) &&
655  "Destination type is not pointer or pointer to member.");
656  }
657 
658  QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
659  UnwrappedDestType = Self.Context.getCanonicalType(DestType);
660 
661  // Find the qualifiers. We only care about cvr-qualifiers for the
662  // purpose of this check, because other qualifiers (address spaces,
663  // Objective-C GC, etc.) are part of the type's identity.
664  QualType PrevUnwrappedSrcType = UnwrappedSrcType;
665  QualType PrevUnwrappedDestType = UnwrappedDestType;
666  auto WorstKind = CastAwayConstnessKind::CACK_Similar;
667  bool AllConstSoFar = true;
668  while (auto Kind = unwrapCastAwayConstnessLevel(
669  Self.Context, UnwrappedSrcType, UnwrappedDestType)) {
670  // Track the worst kind of unwrap we needed to do before we found a
671  // problem.
672  if (Kind > WorstKind)
673  WorstKind = Kind;
674 
675  // Determine the relevant qualifiers at this level.
676  Qualifiers SrcQuals, DestQuals;
677  Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
678  Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
679 
680  // We do not meaningfully track object const-ness of Objective-C object
681  // types. Remove const from the source type if either the source or
682  // the destination is an Objective-C object type.
683  if (UnwrappedSrcType->isObjCObjectType() ||
684  UnwrappedDestType->isObjCObjectType())
685  SrcQuals.removeConst();
686 
687  if (CheckCVR) {
688  Qualifiers SrcCvrQuals =
690  Qualifiers DestCvrQuals =
692 
693  if (SrcCvrQuals != DestCvrQuals) {
694  if (CastAwayQualifiers)
695  *CastAwayQualifiers = SrcCvrQuals - DestCvrQuals;
696 
697  // If we removed a cvr-qualifier, this is casting away 'constness'.
698  if (!DestCvrQuals.compatiblyIncludes(SrcCvrQuals)) {
699  if (TheOffendingSrcType)
700  *TheOffendingSrcType = PrevUnwrappedSrcType;
701  if (TheOffendingDestType)
702  *TheOffendingDestType = PrevUnwrappedDestType;
703  return WorstKind;
704  }
705 
706  // If any prior level was not 'const', this is also casting away
707  // 'constness'. We noted the outermost type missing a 'const' already.
708  if (!AllConstSoFar)
709  return WorstKind;
710  }
711  }
712 
713  if (CheckObjCLifetime &&
714  !DestQuals.compatiblyIncludesObjCLifetime(SrcQuals))
715  return WorstKind;
716 
717  // If we found our first non-const-qualified type, this may be the place
718  // where things start to go wrong.
719  if (AllConstSoFar && !DestQuals.hasConst()) {
720  AllConstSoFar = false;
721  if (TheOffendingSrcType)
722  *TheOffendingSrcType = PrevUnwrappedSrcType;
723  if (TheOffendingDestType)
724  *TheOffendingDestType = PrevUnwrappedDestType;
725  }
726 
727  PrevUnwrappedSrcType = UnwrappedSrcType;
728  PrevUnwrappedDestType = UnwrappedDestType;
729  }
730 
731  return CastAwayConstnessKind::CACK_None;
732 }
733 
734 static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK,
735  unsigned &DiagID) {
736  switch (CACK) {
737  case CastAwayConstnessKind::CACK_None:
738  llvm_unreachable("did not cast away constness");
739 
740  case CastAwayConstnessKind::CACK_Similar:
741  // FIXME: Accept these as an extension too?
742  case CastAwayConstnessKind::CACK_SimilarKind:
743  DiagID = diag::err_bad_cxx_cast_qualifiers_away;
744  return TC_Failed;
745 
746  case CastAwayConstnessKind::CACK_Incoherent:
747  DiagID = diag::ext_bad_cxx_cast_qualifiers_away_incoherent;
748  return TC_Extension;
749  }
750 
751  llvm_unreachable("unexpected cast away constness kind");
752 }
753 
754 /// CheckDynamicCast - Check that a dynamic_cast<DestType>(SrcExpr) is valid.
755 /// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
756 /// checked downcasts in class hierarchies.
757 void CastOperation::CheckDynamicCast() {
758  CheckNoDerefRAII NoderefCheck(*this);
759 
760  if (ValueKind == VK_PRValue)
761  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
762  else if (isPlaceholder())
763  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
764  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
765  return;
766 
767  QualType OrigSrcType = SrcExpr.get()->getType();
768  QualType DestType = Self.Context.getCanonicalType(this->DestType);
769 
770  // C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
771  // or "pointer to cv void".
772 
773  QualType DestPointee;
774  const PointerType *DestPointer = DestType->getAs<PointerType>();
775  const ReferenceType *DestReference = nullptr;
776  if (DestPointer) {
777  DestPointee = DestPointer->getPointeeType();
778  } else if ((DestReference = DestType->getAs<ReferenceType>())) {
779  DestPointee = DestReference->getPointeeType();
780  } else {
781  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
782  << this->DestType << DestRange;
783  SrcExpr = ExprError();
784  return;
785  }
786 
787  const RecordType *DestRecord = DestPointee->getAs<RecordType>();
788  if (DestPointee->isVoidType()) {
789  assert(DestPointer && "Reference to void is not possible");
790  } else if (DestRecord) {
791  if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
792  diag::err_bad_cast_incomplete,
793  DestRange)) {
794  SrcExpr = ExprError();
795  return;
796  }
797  } else {
798  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
799  << DestPointee.getUnqualifiedType() << DestRange;
800  SrcExpr = ExprError();
801  return;
802  }
803 
804  // C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
805  // complete class type, [...]. If T is an lvalue reference type, v shall be
806  // an lvalue of a complete class type, [...]. If T is an rvalue reference
807  // type, v shall be an expression having a complete class type, [...]
808  QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
809  QualType SrcPointee;
810  if (DestPointer) {
811  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
812  SrcPointee = SrcPointer->getPointeeType();
813  } else {
814  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
815  << OrigSrcType << this->DestType << SrcExpr.get()->getSourceRange();
816  SrcExpr = ExprError();
817  return;
818  }
819  } else if (DestReference->isLValueReferenceType()) {
820  if (!SrcExpr.get()->isLValue()) {
821  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
822  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
823  }
824  SrcPointee = SrcType;
825  } else {
826  // If we're dynamic_casting from a prvalue to an rvalue reference, we need
827  // to materialize the prvalue before we bind the reference to it.
828  if (SrcExpr.get()->isPRValue())
829  SrcExpr = Self.CreateMaterializeTemporaryExpr(
830  SrcType, SrcExpr.get(), /*IsLValueReference*/ false);
831  SrcPointee = SrcType;
832  }
833 
834  const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
835  if (SrcRecord) {
836  if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
837  diag::err_bad_cast_incomplete,
838  SrcExpr.get())) {
839  SrcExpr = ExprError();
840  return;
841  }
842  } else {
843  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
844  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
845  SrcExpr = ExprError();
846  return;
847  }
848 
849  assert((DestPointer || DestReference) &&
850  "Bad destination non-ptr/ref slipped through.");
851  assert((DestRecord || DestPointee->isVoidType()) &&
852  "Bad destination pointee slipped through.");
853  assert(SrcRecord && "Bad source pointee slipped through.");
854 
855  // C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
856  if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
857  Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_qualifiers_away)
858  << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
859  SrcExpr = ExprError();
860  return;
861  }
862 
863  // C++ 5.2.7p3: If the type of v is the same as the required result type,
864  // [except for cv].
865  if (DestRecord == SrcRecord) {
866  Kind = CK_NoOp;
867  return;
868  }
869 
870  // C++ 5.2.7p5
871  // Upcasts are resolved statically.
872  if (DestRecord &&
873  Self.IsDerivedFrom(OpRange.getBegin(), SrcPointee, DestPointee)) {
874  if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
875  OpRange.getBegin(), OpRange,
876  &BasePath)) {
877  SrcExpr = ExprError();
878  return;
879  }
880 
881  Kind = CK_DerivedToBase;
882  return;
883  }
884 
885  // C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
886  const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
887  assert(SrcDecl && "Definition missing");
888  if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
889  Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
890  << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
891  SrcExpr = ExprError();
892  }
893 
894  // dynamic_cast is not available with -fno-rtti.
895  // As an exception, dynamic_cast to void* is available because it doesn't
896  // use RTTI.
897  if (!Self.getLangOpts().RTTI && !DestPointee->isVoidType()) {
898  Self.Diag(OpRange.getBegin(), diag::err_no_dynamic_cast_with_fno_rtti);
899  SrcExpr = ExprError();
900  return;
901  }
902 
903  // Warns when dynamic_cast is used with RTTI data disabled.
904  if (!Self.getLangOpts().RTTIData) {
905  bool MicrosoftABI =
906  Self.getASTContext().getTargetInfo().getCXXABI().isMicrosoft();
907  bool isClangCL = Self.getDiagnostics().getDiagnosticOptions().getFormat() ==
909  if (MicrosoftABI || !DestPointee->isVoidType())
910  Self.Diag(OpRange.getBegin(),
911  diag::warn_no_dynamic_cast_with_rtti_disabled)
912  << isClangCL;
913  }
914 
915  // Done. Everything else is run-time checks.
916  Kind = CK_Dynamic;
917 }
918 
919 /// CheckConstCast - Check that a const_cast<DestType>(SrcExpr) is valid.
920 /// Refer to C++ 5.2.11 for details. const_cast is typically used in code
921 /// like this:
922 /// const char *str = "literal";
923 /// legacy_function(const_cast<char*>(str));
924 void CastOperation::CheckConstCast() {
925  CheckNoDerefRAII NoderefCheck(*this);
926 
927  if (ValueKind == VK_PRValue)
928  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
929  else if (isPlaceholder())
930  SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
931  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
932  return;
933 
934  unsigned msg = diag::err_bad_cxx_cast_generic;
935  auto TCR = TryConstCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg);
936  if (TCR != TC_Success && msg != 0) {
937  Self.Diag(OpRange.getBegin(), msg) << CT_Const
938  << SrcExpr.get()->getType() << DestType << OpRange;
939  }
940  if (!isValidCast(TCR))
941  SrcExpr = ExprError();
942 }
943 
944 void CastOperation::CheckAddrspaceCast() {
945  unsigned msg = diag::err_bad_cxx_cast_generic;
946  auto TCR =
947  TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg, Kind);
948  if (TCR != TC_Success && msg != 0) {
949  Self.Diag(OpRange.getBegin(), msg)
950  << CT_Addrspace << SrcExpr.get()->getType() << DestType << OpRange;
951  }
952  if (!isValidCast(TCR))
953  SrcExpr = ExprError();
954 }
955 
956 /// Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast
957 /// or downcast between respective pointers or references.
958 static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr,
959  QualType DestType,
960  SourceRange OpRange) {
961  QualType SrcType = SrcExpr->getType();
962  // When casting from pointer or reference, get pointee type; use original
963  // type otherwise.
964  const CXXRecordDecl *SrcPointeeRD = SrcType->getPointeeCXXRecordDecl();
965  const CXXRecordDecl *SrcRD =
966  SrcPointeeRD ? SrcPointeeRD : SrcType->getAsCXXRecordDecl();
967 
968  // Examining subobjects for records is only possible if the complete and
969  // valid definition is available. Also, template instantiation is not
970  // allowed here.
971  if (!SrcRD || !SrcRD->isCompleteDefinition() || SrcRD->isInvalidDecl())
972  return;
973 
974  const CXXRecordDecl *DestRD = DestType->getPointeeCXXRecordDecl();
975 
976  if (!DestRD || !DestRD->isCompleteDefinition() || DestRD->isInvalidDecl())
977  return;
978 
979  enum {
980  ReinterpretUpcast,
981  ReinterpretDowncast
982  } ReinterpretKind;
983 
984  CXXBasePaths BasePaths;
985 
986  if (SrcRD->isDerivedFrom(DestRD, BasePaths))
987  ReinterpretKind = ReinterpretUpcast;
988  else if (DestRD->isDerivedFrom(SrcRD, BasePaths))
989  ReinterpretKind = ReinterpretDowncast;
990  else
991  return;
992 
993  bool VirtualBase = true;
994  bool NonZeroOffset = false;
995  for (CXXBasePaths::const_paths_iterator I = BasePaths.begin(),
996  E = BasePaths.end();
997  I != E; ++I) {
998  const CXXBasePath &Path = *I;
1000  bool IsVirtual = false;
1001  for (CXXBasePath::const_iterator IElem = Path.begin(), EElem = Path.end();
1002  IElem != EElem; ++IElem) {
1003  IsVirtual = IElem->Base->isVirtual();
1004  if (IsVirtual)
1005  break;
1006  const CXXRecordDecl *BaseRD = IElem->Base->getType()->getAsCXXRecordDecl();
1007  assert(BaseRD && "Base type should be a valid unqualified class type");
1008  // Don't check if any base has invalid declaration or has no definition
1009  // since it has no layout info.
1010  const CXXRecordDecl *Class = IElem->Class,
1011  *ClassDefinition = Class->getDefinition();
1012  if (Class->isInvalidDecl() || !ClassDefinition ||
1013  !ClassDefinition->isCompleteDefinition())
1014  return;
1015 
1016  const ASTRecordLayout &DerivedLayout =
1017  Self.Context.getASTRecordLayout(Class);
1018  Offset += DerivedLayout.getBaseClassOffset(BaseRD);
1019  }
1020  if (!IsVirtual) {
1021  // Don't warn if any path is a non-virtually derived base at offset zero.
1022  if (Offset.isZero())
1023  return;
1024  // Offset makes sense only for non-virtual bases.
1025  else
1026  NonZeroOffset = true;
1027  }
1028  VirtualBase = VirtualBase && IsVirtual;
1029  }
1030 
1031  (void) NonZeroOffset; // Silence set but not used warning.
1032  assert((VirtualBase || NonZeroOffset) &&
1033  "Should have returned if has non-virtual base with zero offset");
1034 
1035  QualType BaseType =
1036  ReinterpretKind == ReinterpretUpcast? DestType : SrcType;
1037  QualType DerivedType =
1038  ReinterpretKind == ReinterpretUpcast? SrcType : DestType;
1039 
1040  SourceLocation BeginLoc = OpRange.getBegin();
1041  Self.Diag(BeginLoc, diag::warn_reinterpret_different_from_static)
1042  << DerivedType << BaseType << !VirtualBase << int(ReinterpretKind)
1043  << OpRange;
1044  Self.Diag(BeginLoc, diag::note_reinterpret_updowncast_use_static)
1045  << int(ReinterpretKind)
1046  << FixItHint::CreateReplacement(BeginLoc, "static_cast");
1047 }
1048 
1049 static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType,
1050  ASTContext &Context) {
1051  if (SrcType->isPointerType() && DestType->isPointerType())
1052  return true;
1053 
1054  // Allow integral type mismatch if their size are equal.
1055  if (SrcType->isIntegralType(Context) && DestType->isIntegralType(Context))
1056  if (Context.getTypeInfoInChars(SrcType).Width ==
1057  Context.getTypeInfoInChars(DestType).Width)
1058  return true;
1059 
1060  return Context.hasSameUnqualifiedType(SrcType, DestType);
1061 }
1062 
1063 static unsigned int checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr,
1064  QualType DestType) {
1065  unsigned int DiagID = 0;
1066  const unsigned int DiagList[] = {diag::warn_cast_function_type_strict,
1067  diag::warn_cast_function_type};
1068  for (auto ID : DiagList) {
1069  if (!Self.Diags.isIgnored(ID, SrcExpr.get()->getExprLoc())) {
1070  DiagID = ID;
1071  break;
1072  }
1073  }
1074  if (!DiagID)
1075  return 0;
1076 
1077  QualType SrcType = SrcExpr.get()->getType();
1078  const FunctionType *SrcFTy = nullptr;
1079  const FunctionType *DstFTy = nullptr;
1080  if (((SrcType->isBlockPointerType() || SrcType->isFunctionPointerType()) &&
1081  DestType->isFunctionPointerType()) ||
1082  (SrcType->isMemberFunctionPointerType() &&
1083  DestType->isMemberFunctionPointerType())) {
1084  SrcFTy = SrcType->getPointeeType()->castAs<FunctionType>();
1085  DstFTy = DestType->getPointeeType()->castAs<FunctionType>();
1086  } else if (SrcType->isFunctionType() && DestType->isFunctionReferenceType()) {
1087  SrcFTy = SrcType->castAs<FunctionType>();
1088  DstFTy = DestType.getNonReferenceType()->castAs<FunctionType>();
1089  } else {
1090  return 0;
1091  }
1092  assert(SrcFTy && DstFTy);
1093 
1094  if (Self.Context.hasSameType(SrcFTy, DstFTy))
1095  return 0;
1096 
1097  // For strict checks, ensure we have an exact match.
1098  if (DiagID == diag::warn_cast_function_type_strict)
1099  return DiagID;
1100 
1101  auto IsVoidVoid = [](const FunctionType *T) {
1102  if (!T->getReturnType()->isVoidType())
1103  return false;
1104  if (const auto *PT = T->getAs<FunctionProtoType>())
1105  return !PT->isVariadic() && PT->getNumParams() == 0;
1106  return false;
1107  };
1108 
1109  // Skip if either function type is void(*)(void)
1110  if (IsVoidVoid(SrcFTy) || IsVoidVoid(DstFTy))
1111  return 0;
1112 
1113  // Check return type.
1114  if (!argTypeIsABIEquivalent(SrcFTy->getReturnType(), DstFTy->getReturnType(),
1115  Self.Context))
1116  return DiagID;
1117 
1118  // Check if either has unspecified number of parameters
1119  if (SrcFTy->isFunctionNoProtoType() || DstFTy->isFunctionNoProtoType())
1120  return 0;
1121 
1122  // Check parameter types.
1123 
1124  const auto *SrcFPTy = cast<FunctionProtoType>(SrcFTy);
1125  const auto *DstFPTy = cast<FunctionProtoType>(DstFTy);
1126 
1127  // In a cast involving function types with a variable argument list only the
1128  // types of initial arguments that are provided are considered.
1129  unsigned NumParams = SrcFPTy->getNumParams();
1130  unsigned DstNumParams = DstFPTy->getNumParams();
1131  if (NumParams > DstNumParams) {
1132  if (!DstFPTy->isVariadic())
1133  return DiagID;
1134  NumParams = DstNumParams;
1135  } else if (NumParams < DstNumParams) {
1136  if (!SrcFPTy->isVariadic())
1137  return DiagID;
1138  }
1139 
1140  for (unsigned i = 0; i < NumParams; ++i)
1141  if (!argTypeIsABIEquivalent(SrcFPTy->getParamType(i),
1142  DstFPTy->getParamType(i), Self.Context))
1143  return DiagID;
1144 
1145  return 0;
1146 }
1147 
1148 /// CheckReinterpretCast - Check that a reinterpret_cast<DestType>(SrcExpr) is
1149 /// valid.
1150 /// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
1151 /// like this:
1152 /// char *bytes = reinterpret_cast<char*>(int_ptr);
1153 void CastOperation::CheckReinterpretCast() {
1154  if (ValueKind == VK_PRValue && !isPlaceholder(BuiltinType::Overload))
1155  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1156  else
1157  checkNonOverloadPlaceholders();
1158  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1159  return;
1160 
1161  unsigned msg = diag::err_bad_cxx_cast_generic;
1162  TryCastResult tcr =
1163  TryReinterpretCast(Self, SrcExpr, DestType,
1164  /*CStyle*/false, OpRange, msg, Kind);
1165  if (tcr != TC_Success && msg != 0) {
1166  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1167  return;
1168  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1169  //FIXME: &f<int>; is overloaded and resolvable
1170  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
1171  << OverloadExpr::find(SrcExpr.get()).Expression->getName()
1172  << DestType << OpRange;
1173  Self.NoteAllOverloadCandidates(SrcExpr.get());
1174 
1175  } else {
1176  diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr.get(),
1177  DestType, /*listInitialization=*/false);
1178  }
1179  }
1180 
1181  if (isValidCast(tcr)) {
1182  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1183  checkObjCConversion(Sema::CCK_OtherCast);
1184  DiagnoseReinterpretUpDownCast(Self, SrcExpr.get(), DestType, OpRange);
1185 
1186  if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
1187  Self.Diag(OpRange.getBegin(), DiagID)
1188  << SrcExpr.get()->getType() << DestType << OpRange;
1189  } else {
1190  SrcExpr = ExprError();
1191  }
1192 }
1193 
1194 
1195 /// CheckStaticCast - Check that a static_cast<DestType>(SrcExpr) is valid.
1196 /// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
1197 /// implicit conversions explicit and getting rid of data loss warnings.
1198 void CastOperation::CheckStaticCast() {
1199  CheckNoDerefRAII NoderefCheck(*this);
1200 
1201  if (isPlaceholder()) {
1202  checkNonOverloadPlaceholders();
1203  if (SrcExpr.isInvalid())
1204  return;
1205  }
1206 
1207  // This test is outside everything else because it's the only case where
1208  // a non-lvalue-reference target type does not lead to decay.
1209  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1210  if (DestType->isVoidType()) {
1211  Kind = CK_ToVoid;
1212 
1213  if (claimPlaceholder(BuiltinType::Overload)) {
1214  Self.ResolveAndFixSingleFunctionTemplateSpecialization(SrcExpr,
1215  false, // Decay Function to ptr
1216  true, // Complain
1217  OpRange, DestType, diag::err_bad_static_cast_overload);
1218  if (SrcExpr.isInvalid())
1219  return;
1220  }
1221 
1222  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
1223  return;
1224  }
1225 
1226  if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
1227  !isPlaceholder(BuiltinType::Overload)) {
1228  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1229  if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1230  return;
1231  }
1232 
1233  unsigned msg = diag::err_bad_cxx_cast_generic;
1234  TryCastResult tcr
1235  = TryStaticCast(Self, SrcExpr, DestType, Sema::CCK_OtherCast, OpRange, msg,
1236  Kind, BasePath, /*ListInitialization=*/false);
1237  if (tcr != TC_Success && msg != 0) {
1238  if (SrcExpr.isInvalid())
1239  return;
1240  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1241  OverloadExpr* oe = OverloadExpr::find(SrcExpr.get()).Expression;
1242  Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
1243  << oe->getName() << DestType << OpRange
1244  << oe->getQualifierLoc().getSourceRange();
1245  Self.NoteAllOverloadCandidates(SrcExpr.get());
1246  } else {
1247  diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr.get(), DestType,
1248  /*listInitialization=*/false);
1249  }
1250  }
1251 
1252  if (isValidCast(tcr)) {
1253  if (Kind == CK_BitCast)
1254  checkCastAlign();
1255  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1256  checkObjCConversion(Sema::CCK_OtherCast);
1257  } else {
1258  SrcExpr = ExprError();
1259  }
1260 }
1261 
1262 static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType) {
1263  auto *SrcPtrType = SrcType->getAs<PointerType>();
1264  if (!SrcPtrType)
1265  return false;
1266  auto *DestPtrType = DestType->getAs<PointerType>();
1267  if (!DestPtrType)
1268  return false;
1269  return SrcPtrType->getPointeeType().getAddressSpace() !=
1270  DestPtrType->getPointeeType().getAddressSpace();
1271 }
1272 
1273 /// TryStaticCast - Check if a static cast can be performed, and do so if
1274 /// possible. If @p CStyle, ignore access restrictions on hierarchy casting
1275 /// and casting away constness.
1277  QualType DestType,
1279  SourceRange OpRange, unsigned &msg,
1280  CastKind &Kind, CXXCastPath &BasePath,
1281  bool ListInitialization) {
1282  // Determine whether we have the semantics of a C-style cast.
1283  bool CStyle
1284  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
1285 
1286  // The order the tests is not entirely arbitrary. There is one conversion
1287  // that can be handled in two different ways. Given:
1288  // struct A {};
1289  // struct B : public A {
1290  // B(); B(const A&);
1291  // };
1292  // const A &a = B();
1293  // the cast static_cast<const B&>(a) could be seen as either a static
1294  // reference downcast, or an explicit invocation of the user-defined
1295  // conversion using B's conversion constructor.
1296  // DR 427 specifies that the downcast is to be applied here.
1297 
1298  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1299  // Done outside this function.
1300 
1301  TryCastResult tcr;
1302 
1303  // C++ 5.2.9p5, reference downcast.
1304  // See the function for details.
1305  // DR 427 specifies that this is to be applied before paragraph 2.
1306  tcr = TryStaticReferenceDowncast(Self, SrcExpr.get(), DestType, CStyle,
1307  OpRange, msg, Kind, BasePath);
1308  if (tcr != TC_NotApplicable)
1309  return tcr;
1310 
1311  // C++11 [expr.static.cast]p3:
1312  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
1313  // T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1314  tcr = TryLValueToRValueCast(Self, SrcExpr.get(), DestType, CStyle, Kind,
1315  BasePath, msg);
1316  if (tcr != TC_NotApplicable)
1317  return tcr;
1318 
1319  // C++ 5.2.9p2: An expression e can be explicitly converted to a type T
1320  // [...] if the declaration "T t(e);" is well-formed, [...].
1321  tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CCK, OpRange, msg,
1322  Kind, ListInitialization);
1323  if (SrcExpr.isInvalid())
1324  return TC_Failed;
1325  if (tcr != TC_NotApplicable)
1326  return tcr;
1327 
1328  // C++ 5.2.9p6: May apply the reverse of any standard conversion, except
1329  // lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
1330  // conversions, subject to further restrictions.
1331  // Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
1332  // of qualification conversions impossible. (In C++20, adding an array bound
1333  // would be the reverse of a qualification conversion, but adding permission
1334  // to add an array bound in a static_cast is a wording oversight.)
1335  // In the CStyle case, the earlier attempt to const_cast should have taken
1336  // care of reverse qualification conversions.
1337 
1338  QualType SrcType = Self.Context.getCanonicalType(SrcExpr.get()->getType());
1339 
1340  // C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
1341  // converted to an integral type. [...] A value of a scoped enumeration type
1342  // can also be explicitly converted to a floating-point type [...].
1343  if (const EnumType *Enum = SrcType->getAs<EnumType>()) {
1344  if (Enum->getDecl()->isScoped()) {
1345  if (DestType->isBooleanType()) {
1346  Kind = CK_IntegralToBoolean;
1347  return TC_Success;
1348  } else if (DestType->isIntegralType(Self.Context)) {
1349  Kind = CK_IntegralCast;
1350  return TC_Success;
1351  } else if (DestType->isRealFloatingType()) {
1352  Kind = CK_IntegralToFloating;
1353  return TC_Success;
1354  }
1355  }
1356  }
1357 
1358  // Reverse integral promotion/conversion. All such conversions are themselves
1359  // again integral promotions or conversions and are thus already handled by
1360  // p2 (TryDirectInitialization above).
1361  // (Note: any data loss warnings should be suppressed.)
1362  // The exception is the reverse of enum->integer, i.e. integer->enum (and
1363  // enum->enum). See also C++ 5.2.9p7.
1364  // The same goes for reverse floating point promotion/conversion and
1365  // floating-integral conversions. Again, only floating->enum is relevant.
1366  if (DestType->isEnumeralType()) {
1367  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1368  diag::err_bad_cast_incomplete)) {
1369  SrcExpr = ExprError();
1370  return TC_Failed;
1371  }
1372  if (SrcType->isIntegralOrEnumerationType()) {
1373  // [expr.static.cast]p10 If the enumeration type has a fixed underlying
1374  // type, the value is first converted to that type by integral conversion
1375  const EnumType *Enum = DestType->castAs<EnumType>();
1376  Kind = Enum->getDecl()->isFixed() &&
1377  Enum->getDecl()->getIntegerType()->isBooleanType()
1378  ? CK_IntegralToBoolean
1379  : CK_IntegralCast;
1380  return TC_Success;
1381  } else if (SrcType->isRealFloatingType()) {
1382  Kind = CK_FloatingToIntegral;
1383  return TC_Success;
1384  }
1385  }
1386 
1387  // Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
1388  // C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
1389  tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
1390  Kind, BasePath);
1391  if (tcr != TC_NotApplicable)
1392  return tcr;
1393 
1394  // Reverse member pointer conversion. C++ 4.11 specifies member pointer
1395  // conversion. C++ 5.2.9p9 has additional information.
1396  // DR54's access restrictions apply here also.
1397  tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
1398  OpRange, msg, Kind, BasePath);
1399  if (tcr != TC_NotApplicable)
1400  return tcr;
1401 
1402  // Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
1403  // void*. C++ 5.2.9p10 specifies additional restrictions, which really is
1404  // just the usual constness stuff.
1405  if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
1406  QualType SrcPointee = SrcPointer->getPointeeType();
1407  if (SrcPointee->isVoidType()) {
1408  if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
1409  QualType DestPointee = DestPointer->getPointeeType();
1410  if (DestPointee->isIncompleteOrObjectType()) {
1411  // This is definitely the intended conversion, but it might fail due
1412  // to a qualifier violation. Note that we permit Objective-C lifetime
1413  // and GC qualifier mismatches here.
1414  if (!CStyle) {
1415  Qualifiers DestPointeeQuals = DestPointee.getQualifiers();
1416  Qualifiers SrcPointeeQuals = SrcPointee.getQualifiers();
1417  DestPointeeQuals.removeObjCGCAttr();
1418  DestPointeeQuals.removeObjCLifetime();
1419  SrcPointeeQuals.removeObjCGCAttr();
1420  SrcPointeeQuals.removeObjCLifetime();
1421  if (DestPointeeQuals != SrcPointeeQuals &&
1422  !DestPointeeQuals.compatiblyIncludes(SrcPointeeQuals)) {
1423  msg = diag::err_bad_cxx_cast_qualifiers_away;
1424  return TC_Failed;
1425  }
1426  }
1427  Kind = IsAddressSpaceConversion(SrcType, DestType)
1428  ? CK_AddressSpaceConversion
1429  : CK_BitCast;
1430  return TC_Success;
1431  }
1432 
1433  // Microsoft permits static_cast from 'pointer-to-void' to
1434  // 'pointer-to-function'.
1435  if (!CStyle && Self.getLangOpts().MSVCCompat &&
1436  DestPointee->isFunctionType()) {
1437  Self.Diag(OpRange.getBegin(), diag::ext_ms_cast_fn_obj) << OpRange;
1438  Kind = CK_BitCast;
1439  return TC_Success;
1440  }
1441  }
1442  else if (DestType->isObjCObjectPointerType()) {
1443  // allow both c-style cast and static_cast of objective-c pointers as
1444  // they are pervasive.
1445  Kind = CK_CPointerToObjCPointerCast;
1446  return TC_Success;
1447  }
1448  else if (CStyle && DestType->isBlockPointerType()) {
1449  // allow c-style cast of void * to block pointers.
1450  Kind = CK_AnyPointerToBlockPointerCast;
1451  return TC_Success;
1452  }
1453  }
1454  }
1455  // Allow arbitrary objective-c pointer conversion with static casts.
1456  if (SrcType->isObjCObjectPointerType() &&
1457  DestType->isObjCObjectPointerType()) {
1458  Kind = CK_BitCast;
1459  return TC_Success;
1460  }
1461  // Allow ns-pointer to cf-pointer conversion in either direction
1462  // with static casts.
1463  if (!CStyle &&
1464  Self.CheckTollFreeBridgeStaticCast(DestType, SrcExpr.get(), Kind))
1465  return TC_Success;
1466 
1467  // See if it looks like the user is trying to convert between
1468  // related record types, and select a better diagnostic if so.
1469  if (auto SrcPointer = SrcType->getAs<PointerType>())
1470  if (auto DestPointer = DestType->getAs<PointerType>())
1471  if (SrcPointer->getPointeeType()->getAs<RecordType>() &&
1472  DestPointer->getPointeeType()->getAs<RecordType>())
1473  msg = diag::err_bad_cxx_cast_unrelated_class;
1474 
1475  if (SrcType->isMatrixType() && DestType->isMatrixType()) {
1476  if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind)) {
1477  SrcExpr = ExprError();
1478  return TC_Failed;
1479  }
1480  return TC_Success;
1481  }
1482 
1483  // We tried everything. Everything! Nothing works! :-(
1484  return TC_NotApplicable;
1485 }
1486 
1487 /// Tests whether a conversion according to N2844 is valid.
1489  QualType DestType, bool CStyle,
1490  CastKind &Kind, CXXCastPath &BasePath,
1491  unsigned &msg) {
1492  // C++11 [expr.static.cast]p3:
1493  // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
1494  // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1495  const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
1496  if (!R)
1497  return TC_NotApplicable;
1498 
1499  if (!SrcExpr->isGLValue())
1500  return TC_NotApplicable;
1501 
1502  // Because we try the reference downcast before this function, from now on
1503  // this is the only cast possibility, so we issue an error if we fail now.
1504  // FIXME: Should allow casting away constness if CStyle.
1505  QualType FromType = SrcExpr->getType();
1506  QualType ToType = R->getPointeeType();
1507  if (CStyle) {
1508  FromType = FromType.getUnqualifiedType();
1509  ToType = ToType.getUnqualifiedType();
1510  }
1511 
1514  SrcExpr->getBeginLoc(), ToType, FromType, &RefConv);
1515  if (RefResult != Sema::Ref_Compatible) {
1516  if (CStyle || RefResult == Sema::Ref_Incompatible)
1517  return TC_NotApplicable;
1518  // Diagnose types which are reference-related but not compatible here since
1519  // we can provide better diagnostics. In these cases forwarding to
1520  // [expr.static.cast]p4 should never result in a well-formed cast.
1521  msg = SrcExpr->isLValue() ? diag::err_bad_lvalue_to_rvalue_cast
1522  : diag::err_bad_rvalue_to_rvalue_cast;
1523  return TC_Failed;
1524  }
1525 
1526  if (RefConv & Sema::ReferenceConversions::DerivedToBase) {
1527  Kind = CK_DerivedToBase;
1528  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1529  /*DetectVirtual=*/true);
1530  if (!Self.IsDerivedFrom(SrcExpr->getBeginLoc(), SrcExpr->getType(),
1531  R->getPointeeType(), Paths))
1532  return TC_NotApplicable;
1533 
1534  Self.BuildBasePathArray(Paths, BasePath);
1535  } else
1536  Kind = CK_NoOp;
1537 
1538  return TC_Success;
1539 }
1540 
1541 /// Tests whether a conversion according to C++ 5.2.9p5 is valid.
1543 TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
1544  bool CStyle, SourceRange OpRange,
1545  unsigned &msg, CastKind &Kind,
1546  CXXCastPath &BasePath) {
1547  // C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
1548  // cast to type "reference to cv2 D", where D is a class derived from B,
1549  // if a valid standard conversion from "pointer to D" to "pointer to B"
1550  // exists, cv2 >= cv1, and B is not a virtual base class of D.
1551  // In addition, DR54 clarifies that the base must be accessible in the
1552  // current context. Although the wording of DR54 only applies to the pointer
1553  // variant of this rule, the intent is clearly for it to apply to the this
1554  // conversion as well.
1555 
1556  const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
1557  if (!DestReference) {
1558  return TC_NotApplicable;
1559  }
1560  bool RValueRef = DestReference->isRValueReferenceType();
1561  if (!RValueRef && !SrcExpr->isLValue()) {
1562  // We know the left side is an lvalue reference, so we can suggest a reason.
1563  msg = diag::err_bad_cxx_cast_rvalue;
1564  return TC_NotApplicable;
1565  }
1566 
1567  QualType DestPointee = DestReference->getPointeeType();
1568 
1569  // FIXME: If the source is a prvalue, we should issue a warning (because the
1570  // cast always has undefined behavior), and for AST consistency, we should
1571  // materialize a temporary.
1572  return TryStaticDowncast(Self,
1573  Self.Context.getCanonicalType(SrcExpr->getType()),
1574  Self.Context.getCanonicalType(DestPointee), CStyle,
1575  OpRange, SrcExpr->getType(), DestType, msg, Kind,
1576  BasePath);
1577 }
1578 
1579 /// Tests whether a conversion according to C++ 5.2.9p8 is valid.
1582  bool CStyle, SourceRange OpRange,
1583  unsigned &msg, CastKind &Kind,
1584  CXXCastPath &BasePath) {
1585  // C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
1586  // type, can be converted to an rvalue of type "pointer to cv2 D", where D
1587  // is a class derived from B, if a valid standard conversion from "pointer
1588  // to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
1589  // class of D.
1590  // In addition, DR54 clarifies that the base must be accessible in the
1591  // current context.
1592 
1593  const PointerType *DestPointer = DestType->getAs<PointerType>();
1594  if (!DestPointer) {
1595  return TC_NotApplicable;
1596  }
1597 
1598  const PointerType *SrcPointer = SrcType->getAs<PointerType>();
1599  if (!SrcPointer) {
1600  msg = diag::err_bad_static_cast_pointer_nonpointer;
1601  return TC_NotApplicable;
1602  }
1603 
1604  return TryStaticDowncast(Self,
1605  Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
1606  Self.Context.getCanonicalType(DestPointer->getPointeeType()),
1607  CStyle, OpRange, SrcType, DestType, msg, Kind,
1608  BasePath);
1609 }
1610 
1611 /// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
1612 /// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
1613 /// DestType is possible and allowed.
1616  bool CStyle, SourceRange OpRange, QualType OrigSrcType,
1617  QualType OrigDestType, unsigned &msg,
1618  CastKind &Kind, CXXCastPath &BasePath) {
1619  // We can only work with complete types. But don't complain if it doesn't work
1620  if (!Self.isCompleteType(OpRange.getBegin(), SrcType) ||
1621  !Self.isCompleteType(OpRange.getBegin(), DestType))
1622  return TC_NotApplicable;
1623 
1624  // Downcast can only happen in class hierarchies, so we need classes.
1625  if (!DestType->getAs<RecordType>() || !SrcType->getAs<RecordType>()) {
1626  return TC_NotApplicable;
1627  }
1628 
1629  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1630  /*DetectVirtual=*/true);
1631  if (!Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths)) {
1632  return TC_NotApplicable;
1633  }
1634 
1635  // Target type does derive from source type. Now we're serious. If an error
1636  // appears now, it's not ignored.
1637  // This may not be entirely in line with the standard. Take for example:
1638  // struct A {};
1639  // struct B : virtual A {
1640  // B(A&);
1641  // };
1642  //
1643  // void f()
1644  // {
1645  // (void)static_cast<const B&>(*((A*)0));
1646  // }
1647  // As far as the standard is concerned, p5 does not apply (A is virtual), so
1648  // p2 should be used instead - "const B& t(*((A*)0));" is perfectly valid.
1649  // However, both GCC and Comeau reject this example, and accepting it would
1650  // mean more complex code if we're to preserve the nice error message.
1651  // FIXME: Being 100% compliant here would be nice to have.
1652 
1653  // Must preserve cv, as always, unless we're in C-style mode.
1654  if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
1655  msg = diag::err_bad_cxx_cast_qualifiers_away;
1656  return TC_Failed;
1657  }
1658 
1659  if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
1660  // This code is analoguous to that in CheckDerivedToBaseConversion, except
1661  // that it builds the paths in reverse order.
1662  // To sum up: record all paths to the base and build a nice string from
1663  // them. Use it to spice up the error message.
1664  if (!Paths.isRecordingPaths()) {
1665  Paths.clear();
1666  Paths.setRecordingPaths(true);
1667  Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths);
1668  }
1669  std::string PathDisplayStr;
1670  std::set<unsigned> DisplayedPaths;
1671  for (clang::CXXBasePath &Path : Paths) {
1672  if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
1673  // We haven't displayed a path to this particular base
1674  // class subobject yet.
1675  PathDisplayStr += "\n ";
1676  for (CXXBasePathElement &PE : llvm::reverse(Path))
1677  PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
1678  PathDisplayStr += QualType(DestType).getAsString();
1679  }
1680  }
1681 
1682  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
1683  << QualType(SrcType).getUnqualifiedType()
1684  << QualType(DestType).getUnqualifiedType()
1685  << PathDisplayStr << OpRange;
1686  msg = 0;
1687  return TC_Failed;
1688  }
1689 
1690  if (Paths.getDetectedVirtual() != nullptr) {
1691  QualType VirtualBase(Paths.getDetectedVirtual(), 0);
1692  Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
1693  << OrigSrcType << OrigDestType << VirtualBase << OpRange;
1694  msg = 0;
1695  return TC_Failed;
1696  }
1697 
1698  if (!CStyle) {
1699  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1700  SrcType, DestType,
1701  Paths.front(),
1702  diag::err_downcast_from_inaccessible_base)) {
1703  case Sema::AR_accessible:
1704  case Sema::AR_delayed: // be optimistic
1705  case Sema::AR_dependent: // be optimistic
1706  break;
1707 
1708  case Sema::AR_inaccessible:
1709  msg = 0;
1710  return TC_Failed;
1711  }
1712  }
1713 
1714  Self.BuildBasePathArray(Paths, BasePath);
1715  Kind = CK_BaseToDerived;
1716  return TC_Success;
1717 }
1718 
1719 /// TryStaticMemberPointerUpcast - Tests whether a conversion according to
1720 /// C++ 5.2.9p9 is valid:
1721 ///
1722 /// An rvalue of type "pointer to member of D of type cv1 T" can be
1723 /// converted to an rvalue of type "pointer to member of B of type cv2 T",
1724 /// where B is a base class of D [...].
1725 ///
1728  QualType DestType, bool CStyle,
1729  SourceRange OpRange,
1730  unsigned &msg, CastKind &Kind,
1731  CXXCastPath &BasePath) {
1732  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
1733  if (!DestMemPtr)
1734  return TC_NotApplicable;
1735 
1736  bool WasOverloadedFunction = false;
1737  DeclAccessPair FoundOverload;
1738  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1739  if (FunctionDecl *Fn
1740  = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(), DestType, false,
1741  FoundOverload)) {
1742  CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
1743  SrcType = Self.Context.getMemberPointerType(Fn->getType(),
1745  WasOverloadedFunction = true;
1746  }
1747  }
1748 
1749  const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1750  if (!SrcMemPtr) {
1751  msg = diag::err_bad_static_cast_member_pointer_nonmp;
1752  return TC_NotApplicable;
1753  }
1754 
1755  // Lock down the inheritance model right now in MS ABI, whether or not the
1756  // pointee types are the same.
1757  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1758  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
1759  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
1760  }
1761 
1762  // T == T, modulo cv
1763  if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
1764  DestMemPtr->getPointeeType()))
1765  return TC_NotApplicable;
1766 
1767  // B base of D
1768  QualType SrcClass(SrcMemPtr->getClass(), 0);
1769  QualType DestClass(DestMemPtr->getClass(), 0);
1770  CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1771  /*DetectVirtual=*/true);
1772  if (!Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths))
1773  return TC_NotApplicable;
1774 
1775  // B is a base of D. But is it an allowed base? If not, it's a hard error.
1776  if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
1777  Paths.clear();
1778  Paths.setRecordingPaths(true);
1779  bool StillOkay =
1780  Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths);
1781  assert(StillOkay);
1782  (void)StillOkay;
1783  std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
1784  Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
1785  << 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
1786  msg = 0;
1787  return TC_Failed;
1788  }
1789 
1790  if (const RecordType *VBase = Paths.getDetectedVirtual()) {
1791  Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
1792  << SrcClass << DestClass << QualType(VBase, 0) << OpRange;
1793  msg = 0;
1794  return TC_Failed;
1795  }
1796 
1797  if (!CStyle) {
1798  switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1799  DestClass, SrcClass,
1800  Paths.front(),
1801  diag::err_upcast_to_inaccessible_base)) {
1802  case Sema::AR_accessible:
1803  case Sema::AR_delayed:
1804  case Sema::AR_dependent:
1805  // Optimistically assume that the delayed and dependent cases
1806  // will work out.
1807  break;
1808 
1809  case Sema::AR_inaccessible:
1810  msg = 0;
1811  return TC_Failed;
1812  }
1813  }
1814 
1815  if (WasOverloadedFunction) {
1816  // Resolve the address of the overloaded function again, this time
1817  // allowing complaints if something goes wrong.
1819  DestType,
1820  true,
1821  FoundOverload);
1822  if (!Fn) {
1823  msg = 0;
1824  return TC_Failed;
1825  }
1826 
1827  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
1828  if (!SrcExpr.isUsable()) {
1829  msg = 0;
1830  return TC_Failed;
1831  }
1832  }
1833 
1834  Self.BuildBasePathArray(Paths, BasePath);
1835  Kind = CK_DerivedToBaseMemberPointer;
1836  return TC_Success;
1837 }
1838 
1839 /// TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2
1840 /// is valid:
1841 ///
1842 /// An expression e can be explicitly converted to a type T using a
1843 /// @c static_cast if the declaration "T t(e);" is well-formed [...].
1845 TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr, QualType DestType,
1847  SourceRange OpRange, unsigned &msg,
1848  CastKind &Kind, bool ListInitialization) {
1849  if (DestType->isRecordType()) {
1850  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1851  diag::err_bad_cast_incomplete) ||
1852  Self.RequireNonAbstractType(OpRange.getBegin(), DestType,
1853  diag::err_allocation_of_abstract_type)) {
1854  msg = 0;
1855  return TC_Failed;
1856  }
1857  }
1858 
1860  InitializationKind InitKind
1861  = (CCK == Sema::CCK_CStyleCast)
1862  ? InitializationKind::CreateCStyleCast(OpRange.getBegin(), OpRange,
1863  ListInitialization)
1864  : (CCK == Sema::CCK_FunctionalCast)
1865  ? InitializationKind::CreateFunctionalCast(OpRange, ListInitialization)
1866  : InitializationKind::CreateCast(OpRange);
1867  Expr *SrcExprRaw = SrcExpr.get();
1868  // FIXME: Per DR242, we should check for an implicit conversion sequence
1869  // or for a constructor that could be invoked by direct-initialization
1870  // here, not for an initialization sequence.
1871  InitializationSequence InitSeq(Self, Entity, InitKind, SrcExprRaw);
1872 
1873  // At this point of CheckStaticCast, if the destination is a reference,
1874  // or the expression is an overload expression this has to work.
1875  // There is no other way that works.
1876  // On the other hand, if we're checking a C-style cast, we've still got
1877  // the reinterpret_cast way.
1878  bool CStyle
1879  = (CCK == Sema::CCK_CStyleCast || CCK == Sema::CCK_FunctionalCast);
1880  if (InitSeq.Failed() && (CStyle || !DestType->isReferenceType()))
1881  return TC_NotApplicable;
1882 
1883  ExprResult Result = InitSeq.Perform(Self, Entity, InitKind, SrcExprRaw);
1884  if (Result.isInvalid()) {
1885  msg = 0;
1886  return TC_Failed;
1887  }
1888 
1889  if (InitSeq.isConstructorInitialization())
1890  Kind = CK_ConstructorConversion;
1891  else
1892  Kind = CK_NoOp;
1893 
1894  SrcExpr = Result;
1895  return TC_Success;
1896 }
1897 
1898 /// TryConstCast - See if a const_cast from source to destination is allowed,
1899 /// and perform it if it is.
1901  QualType DestType, bool CStyle,
1902  unsigned &msg) {
1903  DestType = Self.Context.getCanonicalType(DestType);
1904  QualType SrcType = SrcExpr.get()->getType();
1905  bool NeedToMaterializeTemporary = false;
1906 
1907  if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
1908  // C++11 5.2.11p4:
1909  // if a pointer to T1 can be explicitly converted to the type "pointer to
1910  // T2" using a const_cast, then the following conversions can also be
1911  // made:
1912  // -- an lvalue of type T1 can be explicitly converted to an lvalue of
1913  // type T2 using the cast const_cast<T2&>;
1914  // -- a glvalue of type T1 can be explicitly converted to an xvalue of
1915  // type T2 using the cast const_cast<T2&&>; and
1916  // -- if T1 is a class type, a prvalue of type T1 can be explicitly
1917  // converted to an xvalue of type T2 using the cast const_cast<T2&&>.
1918 
1919  if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr.get()->isLValue()) {
1920  // Cannot const_cast non-lvalue to lvalue reference type. But if this
1921  // is C-style, static_cast might find a way, so we simply suggest a
1922  // message and tell the parent to keep searching.
1923  msg = diag::err_bad_cxx_cast_rvalue;
1924  return TC_NotApplicable;
1925  }
1926 
1927  if (isa<RValueReferenceType>(DestTypeTmp) && SrcExpr.get()->isPRValue()) {
1928  if (!SrcType->isRecordType()) {
1929  // Cannot const_cast non-class prvalue to rvalue reference type. But if
1930  // this is C-style, static_cast can do this.
1931  msg = diag::err_bad_cxx_cast_rvalue;
1932  return TC_NotApplicable;
1933  }
1934 
1935  // Materialize the class prvalue so that the const_cast can bind a
1936  // reference to it.
1937  NeedToMaterializeTemporary = true;
1938  }
1939 
1940  // It's not completely clear under the standard whether we can
1941  // const_cast bit-field gl-values. Doing so would not be
1942  // intrinsically complicated, but for now, we say no for
1943  // consistency with other compilers and await the word of the
1944  // committee.
1945  if (SrcExpr.get()->refersToBitField()) {
1946  msg = diag::err_bad_cxx_cast_bitfield;
1947  return TC_NotApplicable;
1948  }
1949 
1950  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1951  SrcType = Self.Context.getPointerType(SrcType);
1952  }
1953 
1954  // C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
1955  // the rules for const_cast are the same as those used for pointers.
1956 
1957  if (!DestType->isPointerType() &&
1958  !DestType->isMemberPointerType() &&
1959  !DestType->isObjCObjectPointerType()) {
1960  // Cannot cast to non-pointer, non-reference type. Note that, if DestType
1961  // was a reference type, we converted it to a pointer above.
1962  // The status of rvalue references isn't entirely clear, but it looks like
1963  // conversion to them is simply invalid.
1964  // C++ 5.2.11p3: For two pointer types [...]
1965  if (!CStyle)
1966  msg = diag::err_bad_const_cast_dest;
1967  return TC_NotApplicable;
1968  }
1969  if (DestType->isFunctionPointerType() ||
1970  DestType->isMemberFunctionPointerType()) {
1971  // Cannot cast direct function pointers.
1972  // C++ 5.2.11p2: [...] where T is any object type or the void type [...]
1973  // T is the ultimate pointee of source and target type.
1974  if (!CStyle)
1975  msg = diag::err_bad_const_cast_dest;
1976  return TC_NotApplicable;
1977  }
1978 
1979  // C++ [expr.const.cast]p3:
1980  // "For two similar types T1 and T2, [...]"
1981  //
1982  // We only allow a const_cast to change cvr-qualifiers, not other kinds of
1983  // type qualifiers. (Likewise, we ignore other changes when determining
1984  // whether a cast casts away constness.)
1985  if (!Self.Context.hasCvrSimilarType(SrcType, DestType))
1986  return TC_NotApplicable;
1987 
1988  if (NeedToMaterializeTemporary)
1989  // This is a const_cast from a class prvalue to an rvalue reference type.
1990  // Materialize a temporary to store the result of the conversion.
1991  SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcExpr.get()->getType(),
1992  SrcExpr.get(),
1993  /*IsLValueReference*/ false);
1994 
1995  return TC_Success;
1996 }
1997 
1998 // Checks for undefined behavior in reinterpret_cast.
1999 // The cases that is checked for is:
2000 // *reinterpret_cast<T*>(&a)
2001 // reinterpret_cast<T&>(a)
2002 // where accessing 'a' as type 'T' will result in undefined behavior.
2004  bool IsDereference,
2005  SourceRange Range) {
2006  unsigned DiagID = IsDereference ?
2007  diag::warn_pointer_indirection_from_incompatible_type :
2008  diag::warn_undefined_reinterpret_cast;
2009 
2010  if (Diags.isIgnored(DiagID, Range.getBegin()))
2011  return;
2012 
2013  QualType SrcTy, DestTy;
2014  if (IsDereference) {
2015  if (!SrcType->getAs<PointerType>() || !DestType->getAs<PointerType>()) {
2016  return;
2017  }
2018  SrcTy = SrcType->getPointeeType();
2019  DestTy = DestType->getPointeeType();
2020  } else {
2021  if (!DestType->getAs<ReferenceType>()) {
2022  return;
2023  }
2024  SrcTy = SrcType;
2025  DestTy = DestType->getPointeeType();
2026  }
2027 
2028  // Cast is compatible if the types are the same.
2029  if (Context.hasSameUnqualifiedType(DestTy, SrcTy)) {
2030  return;
2031  }
2032  // or one of the types is a char or void type
2033  if (DestTy->isAnyCharacterType() || DestTy->isVoidType() ||
2034  SrcTy->isAnyCharacterType() || SrcTy->isVoidType()) {
2035  return;
2036  }
2037  // or one of the types is a tag type.
2038  if (SrcTy->getAs<TagType>() || DestTy->getAs<TagType>()) {
2039  return;
2040  }
2041 
2042  // FIXME: Scoped enums?
2043  if ((SrcTy->isUnsignedIntegerType() && DestTy->isSignedIntegerType()) ||
2044  (SrcTy->isSignedIntegerType() && DestTy->isUnsignedIntegerType())) {
2045  if (Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) {
2046  return;
2047  }
2048  }
2049 
2050  Diag(Range.getBegin(), DiagID) << SrcType << DestType << Range;
2051 }
2052 
2053 static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr,
2054  QualType DestType) {
2055  QualType SrcType = SrcExpr.get()->getType();
2056  if (Self.Context.hasSameType(SrcType, DestType))
2057  return;
2058  if (const PointerType *SrcPtrTy = SrcType->getAs<PointerType>())
2059  if (SrcPtrTy->isObjCSelType()) {
2060  QualType DT = DestType;
2061  if (isa<PointerType>(DestType))
2062  DT = DestType->getPointeeType();
2063  if (!DT.getUnqualifiedType()->isVoidType())
2064  Self.Diag(SrcExpr.get()->getExprLoc(),
2065  diag::warn_cast_pointer_from_sel)
2066  << SrcType << DestType << SrcExpr.get()->getSourceRange();
2067  }
2068 }
2069 
2070 /// Diagnose casts that change the calling convention of a pointer to a function
2071 /// defined in the current TU.
2072 static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr,
2073  QualType DstType, SourceRange OpRange) {
2074  // Check if this cast would change the calling convention of a function
2075  // pointer type.
2076  QualType SrcType = SrcExpr.get()->getType();
2077  if (Self.Context.hasSameType(SrcType, DstType) ||
2078  !SrcType->isFunctionPointerType() || !DstType->isFunctionPointerType())
2079  return;
2080  const auto *SrcFTy =
2081  SrcType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2082  const auto *DstFTy =
2083  DstType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2084  CallingConv SrcCC = SrcFTy->getCallConv();
2085  CallingConv DstCC = DstFTy->getCallConv();
2086  if (SrcCC == DstCC)
2087  return;
2088 
2089  // We have a calling convention cast. Check if the source is a pointer to a
2090  // known, specific function that has already been defined.
2091  Expr *Src = SrcExpr.get()->IgnoreParenImpCasts();
2092  if (auto *UO = dyn_cast<UnaryOperator>(Src))
2093  if (UO->getOpcode() == UO_AddrOf)
2094  Src = UO->getSubExpr()->IgnoreParenImpCasts();
2095  auto *DRE = dyn_cast<DeclRefExpr>(Src);
2096  if (!DRE)
2097  return;
2098  auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
2099  if (!FD)
2100  return;
2101 
2102  // Only warn if we are casting from the default convention to a non-default
2103  // convention. This can happen when the programmer forgot to apply the calling
2104  // convention to the function declaration and then inserted this cast to
2105  // satisfy the type system.
2107  FD->isVariadic(), FD->isCXXInstanceMember());
2108  if (DstCC == DefaultCC || SrcCC != DefaultCC)
2109  return;
2110 
2111  // Diagnose this cast, as it is probably bad.
2112  StringRef SrcCCName = FunctionType::getNameForCallConv(SrcCC);
2113  StringRef DstCCName = FunctionType::getNameForCallConv(DstCC);
2114  Self.Diag(OpRange.getBegin(), diag::warn_cast_calling_conv)
2115  << SrcCCName << DstCCName << OpRange;
2116 
2117  // The checks above are cheaper than checking if the diagnostic is enabled.
2118  // However, it's worth checking if the warning is enabled before we construct
2119  // a fixit.
2120  if (Self.Diags.isIgnored(diag::warn_cast_calling_conv, OpRange.getBegin()))
2121  return;
2122 
2123  // Try to suggest a fixit to change the calling convention of the function
2124  // whose address was taken. Try to use the latest macro for the convention.
2125  // For example, users probably want to write "WINAPI" instead of "__stdcall"
2126  // to match the Windows header declarations.
2127  SourceLocation NameLoc = FD->getFirstDecl()->getNameInfo().getLoc();
2128  Preprocessor &PP = Self.getPreprocessor();
2129  SmallVector<TokenValue, 6> AttrTokens;
2130  SmallString<64> CCAttrText;
2131  llvm::raw_svector_ostream OS(CCAttrText);
2132  if (Self.getLangOpts().MicrosoftExt) {
2133  // __stdcall or __vectorcall
2134  OS << "__" << DstCCName;
2135  IdentifierInfo *II = PP.getIdentifierInfo(OS.str());
2136  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2137  ? TokenValue(II->getTokenID())
2138  : TokenValue(II));
2139  } else {
2140  // __attribute__((stdcall)) or __attribute__((vectorcall))
2141  OS << "__attribute__((" << DstCCName << "))";
2142  AttrTokens.push_back(tok::kw___attribute);
2143  AttrTokens.push_back(tok::l_paren);
2144  AttrTokens.push_back(tok::l_paren);
2145  IdentifierInfo *II = PP.getIdentifierInfo(DstCCName);
2146  AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2147  ? TokenValue(II->getTokenID())
2148  : TokenValue(II));
2149  AttrTokens.push_back(tok::r_paren);
2150  AttrTokens.push_back(tok::r_paren);
2151  }
2152  StringRef AttrSpelling = PP.getLastMacroWithSpelling(NameLoc, AttrTokens);
2153  if (!AttrSpelling.empty())
2154  CCAttrText = AttrSpelling;
2155  OS << ' ';
2156  Self.Diag(NameLoc, diag::note_change_calling_conv_fixit)
2157  << FD << DstCCName << FixItHint::CreateInsertion(NameLoc, CCAttrText);
2158 }
2159 
2160 static void checkIntToPointerCast(bool CStyle, const SourceRange &OpRange,
2161  const Expr *SrcExpr, QualType DestType,
2162  Sema &Self) {
2163  QualType SrcType = SrcExpr->getType();
2164 
2165  // Not warning on reinterpret_cast, boolean, constant expressions, etc
2166  // are not explicit design choices, but consistent with GCC's behavior.
2167  // Feel free to modify them if you've reason/evidence for an alternative.
2168  if (CStyle && SrcType->isIntegralType(Self.Context)
2169  && !SrcType->isBooleanType()
2170  && !SrcType->isEnumeralType()
2171  && !SrcExpr->isIntegerConstantExpr(Self.Context)
2172  && Self.Context.getTypeSize(DestType) >
2173  Self.Context.getTypeSize(SrcType)) {
2174  // Separate between casts to void* and non-void* pointers.
2175  // Some APIs use (abuse) void* for something like a user context,
2176  // and often that value is an integer even if it isn't a pointer itself.
2177  // Having a separate warning flag allows users to control the warning
2178  // for their workflow.
2179  unsigned Diag = DestType->isVoidPointerType() ?
2180  diag::warn_int_to_void_pointer_cast
2181  : diag::warn_int_to_pointer_cast;
2182  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2183  }
2184 }
2185 
2186 static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType,
2187  ExprResult &Result) {
2188  // We can only fix an overloaded reinterpret_cast if
2189  // - it is a template with explicit arguments that resolves to an lvalue
2190  // unambiguously, or
2191  // - it is the only function in an overload set that may have its address
2192  // taken.
2193 
2194  Expr *E = Result.get();
2195  // TODO: what if this fails because of DiagnoseUseOfDecl or something
2196  // like it?
2198  Result,
2199  Expr::getValueKindForType(DestType) ==
2200  VK_PRValue // Convert Fun to Ptr
2201  ) &&
2202  Result.isUsable())
2203  return true;
2204 
2205  // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
2206  // preserves Result.
2207  Result = E;
2209  Result, /*DoFunctionPointerConversion=*/true))
2210  return false;
2211  return Result.isUsable();
2212 }
2213 
2215  QualType DestType, bool CStyle,
2216  SourceRange OpRange,
2217  unsigned &msg,
2218  CastKind &Kind) {
2219  bool IsLValueCast = false;
2220 
2221  DestType = Self.Context.getCanonicalType(DestType);
2222  QualType SrcType = SrcExpr.get()->getType();
2223 
2224  // Is the source an overloaded name? (i.e. &foo)
2225  // If so, reinterpret_cast generally can not help us here (13.4, p1, bullet 5)
2226  if (SrcType == Self.Context.OverloadTy) {
2227  ExprResult FixedExpr = SrcExpr;
2228  if (!fixOverloadedReinterpretCastExpr(Self, DestType, FixedExpr))
2229  return TC_NotApplicable;
2230 
2231  assert(FixedExpr.isUsable() && "Invalid result fixing overloaded expr");
2232  SrcExpr = FixedExpr;
2233  SrcType = SrcExpr.get()->getType();
2234  }
2235 
2236  if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
2237  if (!SrcExpr.get()->isGLValue()) {
2238  // Cannot cast non-glvalue to (lvalue or rvalue) reference type. See the
2239  // similar comment in const_cast.
2240  msg = diag::err_bad_cxx_cast_rvalue;
2241  return TC_NotApplicable;
2242  }
2243 
2244  if (!CStyle) {
2245  Self.CheckCompatibleReinterpretCast(SrcType, DestType,
2246  /*IsDereference=*/false, OpRange);
2247  }
2248 
2249  // C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
2250  // same effect as the conversion *reinterpret_cast<T*>(&x) with the
2251  // built-in & and * operators.
2252 
2253  const char *inappropriate = nullptr;
2254  switch (SrcExpr.get()->getObjectKind()) {
2255  case OK_Ordinary:
2256  break;
2257  case OK_BitField:
2258  msg = diag::err_bad_cxx_cast_bitfield;
2259  return TC_NotApplicable;
2260  // FIXME: Use a specific diagnostic for the rest of these cases.
2261  case OK_VectorComponent: inappropriate = "vector element"; break;
2262  case OK_MatrixComponent:
2263  inappropriate = "matrix element";
2264  break;
2265  case OK_ObjCProperty: inappropriate = "property expression"; break;
2266  case OK_ObjCSubscript: inappropriate = "container subscripting expression";
2267  break;
2268  }
2269  if (inappropriate) {
2270  Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_reference)
2271  << inappropriate << DestType
2272  << OpRange << SrcExpr.get()->getSourceRange();
2273  msg = 0; SrcExpr = ExprError();
2274  return TC_NotApplicable;
2275  }
2276 
2277  // This code does this transformation for the checked types.
2278  DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
2279  SrcType = Self.Context.getPointerType(SrcType);
2280 
2281  IsLValueCast = true;
2282  }
2283 
2284  // Canonicalize source for comparison.
2285  SrcType = Self.Context.getCanonicalType(SrcType);
2286 
2287  const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
2288  *SrcMemPtr = SrcType->getAs<MemberPointerType>();
2289  if (DestMemPtr && SrcMemPtr) {
2290  // C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
2291  // can be explicitly converted to an rvalue of type "pointer to member
2292  // of Y of type T2" if T1 and T2 are both function types or both object
2293  // types.
2294  if (DestMemPtr->isMemberFunctionPointer() !=
2295  SrcMemPtr->isMemberFunctionPointer())
2296  return TC_NotApplicable;
2297 
2298  if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2299  // We need to determine the inheritance model that the class will use if
2300  // haven't yet.
2301  (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
2302  (void)Self.isCompleteType(OpRange.getBegin(), DestType);
2303  }
2304 
2305  // Don't allow casting between member pointers of different sizes.
2306  if (Self.Context.getTypeSize(DestMemPtr) !=
2307  Self.Context.getTypeSize(SrcMemPtr)) {
2308  msg = diag::err_bad_cxx_cast_member_pointer_size;
2309  return TC_Failed;
2310  }
2311 
2312  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
2313  // constness.
2314  // A reinterpret_cast followed by a const_cast can, though, so in C-style,
2315  // we accept it.
2316  if (auto CACK =
2317  CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2318  /*CheckObjCLifetime=*/CStyle))
2319  return getCastAwayConstnessCastKind(CACK, msg);
2320 
2321  // A valid member pointer cast.
2322  assert(!IsLValueCast);
2323  Kind = CK_ReinterpretMemberPointer;
2324  return TC_Success;
2325  }
2326 
2327  // See below for the enumeral issue.
2328  if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
2329  // C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
2330  // type large enough to hold it. A value of std::nullptr_t can be
2331  // converted to an integral type; the conversion has the same meaning
2332  // and validity as a conversion of (void*)0 to the integral type.
2333  if (Self.Context.getTypeSize(SrcType) >
2334  Self.Context.getTypeSize(DestType)) {
2335  msg = diag::err_bad_reinterpret_cast_small_int;
2336  return TC_Failed;
2337  }
2338  Kind = CK_PointerToIntegral;
2339  return TC_Success;
2340  }
2341 
2342  // Allow reinterpret_casts between vectors of the same size and
2343  // between vectors and integers of the same size.
2344  bool destIsVector = DestType->isVectorType();
2345  bool srcIsVector = SrcType->isVectorType();
2346  if (srcIsVector || destIsVector) {
2347  // Allow bitcasting between SVE VLATs and VLSTs, and vice-versa.
2348  if (Self.isValidSveBitcast(SrcType, DestType)) {
2349  Kind = CK_BitCast;
2350  return TC_Success;
2351  }
2352 
2353  // The non-vector type, if any, must have integral type. This is
2354  // the same rule that C vector casts use; note, however, that enum
2355  // types are not integral in C++.
2356  if ((!destIsVector && !DestType->isIntegralType(Self.Context)) ||
2357  (!srcIsVector && !SrcType->isIntegralType(Self.Context)))
2358  return TC_NotApplicable;
2359 
2360  // The size we want to consider is eltCount * eltSize.
2361  // That's exactly what the lax-conversion rules will check.
2362  if (Self.areLaxCompatibleVectorTypes(SrcType, DestType)) {
2363  Kind = CK_BitCast;
2364  return TC_Success;
2365  }
2366 
2367  if (Self.LangOpts.OpenCL && !CStyle) {
2368  if (DestType->isExtVectorType() || SrcType->isExtVectorType()) {
2369  // FIXME: Allow for reinterpret cast between 3 and 4 element vectors
2370  if (Self.areVectorTypesSameSize(SrcType, DestType)) {
2371  Kind = CK_BitCast;
2372  return TC_Success;
2373  }
2374  }
2375  }
2376 
2377  // Otherwise, pick a reasonable diagnostic.
2378  if (!destIsVector)
2379  msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
2380  else if (!srcIsVector)
2381  msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
2382  else
2383  msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
2384 
2385  return TC_Failed;
2386  }
2387 
2388  if (SrcType == DestType) {
2389  // C++ 5.2.10p2 has a note that mentions that, subject to all other
2390  // restrictions, a cast to the same type is allowed so long as it does not
2391  // cast away constness. In C++98, the intent was not entirely clear here,
2392  // since all other paragraphs explicitly forbid casts to the same type.
2393  // C++11 clarifies this case with p2.
2394  //
2395  // The only allowed types are: integral, enumeration, pointer, or
2396  // pointer-to-member types. We also won't restrict Obj-C pointers either.
2397  Kind = CK_NoOp;
2399  if (SrcType->isIntegralOrEnumerationType() ||
2400  SrcType->isAnyPointerType() ||
2401  SrcType->isMemberPointerType() ||
2402  SrcType->isBlockPointerType()) {
2403  Result = TC_Success;
2404  }
2405  return Result;
2406  }
2407 
2408  bool destIsPtr = DestType->isAnyPointerType() ||
2409  DestType->isBlockPointerType();
2410  bool srcIsPtr = SrcType->isAnyPointerType() ||
2411  SrcType->isBlockPointerType();
2412  if (!destIsPtr && !srcIsPtr) {
2413  // Except for std::nullptr_t->integer and lvalue->reference, which are
2414  // handled above, at least one of the two arguments must be a pointer.
2415  return TC_NotApplicable;
2416  }
2417 
2418  if (DestType->isIntegralType(Self.Context)) {
2419  assert(srcIsPtr && "One type must be a pointer");
2420  // C++ 5.2.10p4: A pointer can be explicitly converted to any integral
2421  // type large enough to hold it; except in Microsoft mode, where the
2422  // integral type size doesn't matter (except we don't allow bool).
2423  if ((Self.Context.getTypeSize(SrcType) >
2424  Self.Context.getTypeSize(DestType))) {
2425  bool MicrosoftException =
2426  Self.getLangOpts().MicrosoftExt && !DestType->isBooleanType();
2427  if (MicrosoftException) {
2428  unsigned Diag = SrcType->isVoidPointerType()
2429  ? diag::warn_void_pointer_to_int_cast
2430  : diag::warn_pointer_to_int_cast;
2431  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2432  } else {
2433  msg = diag::err_bad_reinterpret_cast_small_int;
2434  return TC_Failed;
2435  }
2436  }
2437  Kind = CK_PointerToIntegral;
2438  return TC_Success;
2439  }
2440 
2441  if (SrcType->isIntegralOrEnumerationType()) {
2442  assert(destIsPtr && "One type must be a pointer");
2443  checkIntToPointerCast(CStyle, OpRange, SrcExpr.get(), DestType, Self);
2444  // C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
2445  // converted to a pointer.
2446  // C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
2447  // necessarily converted to a null pointer value.]
2448  Kind = CK_IntegralToPointer;
2449  return TC_Success;
2450  }
2451 
2452  if (!destIsPtr || !srcIsPtr) {
2453  // With the valid non-pointer conversions out of the way, we can be even
2454  // more stringent.
2455  return TC_NotApplicable;
2456  }
2457 
2458  // Cannot convert between block pointers and Objective-C object pointers.
2459  if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) ||
2460  (DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
2461  return TC_NotApplicable;
2462 
2463  // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
2464  // The C-style cast operator can.
2465  TryCastResult SuccessResult = TC_Success;
2466  if (auto CACK =
2467  CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2468  /*CheckObjCLifetime=*/CStyle))
2469  SuccessResult = getCastAwayConstnessCastKind(CACK, msg);
2470 
2471  if (IsAddressSpaceConversion(SrcType, DestType)) {
2472  Kind = CK_AddressSpaceConversion;
2473  assert(SrcType->isPointerType() && DestType->isPointerType());
2474  if (!CStyle &&
2476  SrcType->getPointeeType().getQualifiers())) {
2477  SuccessResult = TC_Failed;
2478  }
2479  } else if (IsLValueCast) {
2480  Kind = CK_LValueBitCast;
2481  } else if (DestType->isObjCObjectPointerType()) {
2482  Kind = Self.PrepareCastToObjCObjectPointer(SrcExpr);
2483  } else if (DestType->isBlockPointerType()) {
2484  if (!SrcType->isBlockPointerType()) {
2485  Kind = CK_AnyPointerToBlockPointerCast;
2486  } else {
2487  Kind = CK_BitCast;
2488  }
2489  } else {
2490  Kind = CK_BitCast;
2491  }
2492 
2493  // Any pointer can be cast to an Objective-C pointer type with a C-style
2494  // cast.
2495  if (CStyle && DestType->isObjCObjectPointerType()) {
2496  return SuccessResult;
2497  }
2498  if (CStyle)
2499  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2500 
2501  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2502 
2503  // Not casting away constness, so the only remaining check is for compatible
2504  // pointer categories.
2505 
2506  if (SrcType->isFunctionPointerType()) {
2507  if (DestType->isFunctionPointerType()) {
2508  // C++ 5.2.10p6: A pointer to a function can be explicitly converted to
2509  // a pointer to a function of a different type.
2510  return SuccessResult;
2511  }
2512 
2513  // C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
2514  // an object type or vice versa is conditionally-supported.
2515  // Compilers support it in C++03 too, though, because it's necessary for
2516  // casting the return value of dlsym() and GetProcAddress().
2517  // FIXME: Conditionally-supported behavior should be configurable in the
2518  // TargetInfo or similar.
2519  Self.Diag(OpRange.getBegin(),
2520  Self.getLangOpts().CPlusPlus11 ?
2521  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2522  << OpRange;
2523  return SuccessResult;
2524  }
2525 
2526  if (DestType->isFunctionPointerType()) {
2527  // See above.
2528  Self.Diag(OpRange.getBegin(),
2529  Self.getLangOpts().CPlusPlus11 ?
2530  diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2531  << OpRange;
2532  return SuccessResult;
2533  }
2534 
2535  // Diagnose address space conversion in nested pointers.
2536  QualType DestPtee = DestType->getPointeeType().isNull()
2537  ? DestType->getPointeeType()
2538  : DestType->getPointeeType()->getPointeeType();
2539  QualType SrcPtee = SrcType->getPointeeType().isNull()
2540  ? SrcType->getPointeeType()
2541  : SrcType->getPointeeType()->getPointeeType();
2542  while (!DestPtee.isNull() && !SrcPtee.isNull()) {
2543  if (DestPtee.getAddressSpace() != SrcPtee.getAddressSpace()) {
2544  Self.Diag(OpRange.getBegin(),
2545  diag::warn_bad_cxx_cast_nested_pointer_addr_space)
2546  << CStyle << SrcType << DestType << SrcExpr.get()->getSourceRange();
2547  break;
2548  }
2549  DestPtee = DestPtee->getPointeeType();
2550  SrcPtee = SrcPtee->getPointeeType();
2551  }
2552 
2553  // C++ 5.2.10p7: A pointer to an object can be explicitly converted to
2554  // a pointer to an object of different type.
2555  // Void pointers are not specified, but supported by every compiler out there.
2556  // So we finish by allowing everything that remains - it's got to be two
2557  // object pointers.
2558  return SuccessResult;
2559 }
2560 
2562  QualType DestType, bool CStyle,
2563  unsigned &msg, CastKind &Kind) {
2564  if (!Self.getLangOpts().OpenCL && !Self.getLangOpts().SYCLIsDevice)
2565  // FIXME: As compiler doesn't have any information about overlapping addr
2566  // spaces at the moment we have to be permissive here.
2567  return TC_NotApplicable;
2568  // Even though the logic below is general enough and can be applied to
2569  // non-OpenCL mode too, we fast-path above because no other languages
2570  // define overlapping address spaces currently.
2571  auto SrcType = SrcExpr.get()->getType();
2572  // FIXME: Should this be generalized to references? The reference parameter
2573  // however becomes a reference pointee type here and therefore rejected.
2574  // Perhaps this is the right behavior though according to C++.
2575  auto SrcPtrType = SrcType->getAs<PointerType>();
2576  if (!SrcPtrType)
2577  return TC_NotApplicable;
2578  auto DestPtrType = DestType->getAs<PointerType>();
2579  if (!DestPtrType)
2580  return TC_NotApplicable;
2581  auto SrcPointeeType = SrcPtrType->getPointeeType();
2582  auto DestPointeeType = DestPtrType->getPointeeType();
2583  if (!DestPointeeType.isAddressSpaceOverlapping(SrcPointeeType)) {
2584  msg = diag::err_bad_cxx_cast_addr_space_mismatch;
2585  return TC_Failed;
2586  }
2587  auto SrcPointeeTypeWithoutAS =
2588  Self.Context.removeAddrSpaceQualType(SrcPointeeType.getCanonicalType());
2589  auto DestPointeeTypeWithoutAS =
2590  Self.Context.removeAddrSpaceQualType(DestPointeeType.getCanonicalType());
2591  if (Self.Context.hasSameType(SrcPointeeTypeWithoutAS,
2592  DestPointeeTypeWithoutAS)) {
2593  Kind = SrcPointeeType.getAddressSpace() == DestPointeeType.getAddressSpace()
2594  ? CK_NoOp
2595  : CK_AddressSpaceConversion;
2596  return TC_Success;
2597  } else {
2598  return TC_NotApplicable;
2599  }
2600 }
2601 
2602 void CastOperation::checkAddressSpaceCast(QualType SrcType, QualType DestType) {
2603  // In OpenCL only conversions between pointers to objects in overlapping
2604  // addr spaces are allowed. v2.0 s6.5.5 - Generic addr space overlaps
2605  // with any named one, except for constant.
2606 
2607  // Converting the top level pointee addrspace is permitted for compatible
2608  // addrspaces (such as 'generic int *' to 'local int *' or vice versa), but
2609  // if any of the nested pointee addrspaces differ, we emit a warning
2610  // regardless of addrspace compatibility. This makes
2611  // local int ** p;
2612  // return (generic int **) p;
2613  // warn even though local -> generic is permitted.
2614  if (Self.getLangOpts().OpenCL) {
2615  const Type *DestPtr, *SrcPtr;
2616  bool Nested = false;
2617  unsigned DiagID = diag::err_typecheck_incompatible_address_space;
2618  DestPtr = Self.getASTContext().getCanonicalType(DestType.getTypePtr()),
2619  SrcPtr = Self.getASTContext().getCanonicalType(SrcType.getTypePtr());
2620 
2621  while (isa<PointerType>(DestPtr) && isa<PointerType>(SrcPtr)) {
2622  const PointerType *DestPPtr = cast<PointerType>(DestPtr);
2623  const PointerType *SrcPPtr = cast<PointerType>(SrcPtr);
2624  QualType DestPPointee = DestPPtr->getPointeeType();
2625  QualType SrcPPointee = SrcPPtr->getPointeeType();
2626  if (Nested
2627  ? DestPPointee.getAddressSpace() != SrcPPointee.getAddressSpace()
2628  : !DestPPointee.isAddressSpaceOverlapping(SrcPPointee)) {
2629  Self.Diag(OpRange.getBegin(), DiagID)
2630  << SrcType << DestType << Sema::AA_Casting
2631  << SrcExpr.get()->getSourceRange();
2632  if (!Nested)
2633  SrcExpr = ExprError();
2634  return;
2635  }
2636 
2637  DestPtr = DestPPtr->getPointeeType().getTypePtr();
2638  SrcPtr = SrcPPtr->getPointeeType().getTypePtr();
2639  Nested = true;
2640  DiagID = diag::ext_nested_pointer_qualifier_mismatch;
2641  }
2642  }
2643 }
2644 
2646  bool SrcCompatXL = this->getLangOpts().getAltivecSrcCompat() ==
2648  VectorType::VectorKind VKind = VecTy->getVectorKind();
2649 
2650  if ((VKind == VectorType::AltiVecVector) ||
2651  (SrcCompatXL && ((VKind == VectorType::AltiVecBool) ||
2652  (VKind == VectorType::AltiVecPixel)))) {
2653  return true;
2654  }
2655  return false;
2656 }
2657 
2659  QualType SrcTy) {
2660  bool SrcCompatGCC = this->getLangOpts().getAltivecSrcCompat() ==
2662  if (this->getLangOpts().AltiVec && SrcCompatGCC) {
2663  this->Diag(R.getBegin(),
2664  diag::err_invalid_conversion_between_vector_and_integer)
2665  << VecTy << SrcTy << R;
2666  return true;
2667  }
2668  return false;
2669 }
2670 
2671 void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
2672  bool ListInitialization) {
2673  assert(Self.getLangOpts().CPlusPlus);
2674 
2675  // Handle placeholders.
2676  if (isPlaceholder()) {
2677  // C-style casts can resolve __unknown_any types.
2678  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2679  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2680  SrcExpr.get(), Kind,
2681  ValueKind, BasePath);
2682  return;
2683  }
2684 
2685  checkNonOverloadPlaceholders();
2686  if (SrcExpr.isInvalid())
2687  return;
2688  }
2689 
2690  // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
2691  // This test is outside everything else because it's the only case where
2692  // a non-lvalue-reference target type does not lead to decay.
2693  if (DestType->isVoidType()) {
2694  Kind = CK_ToVoid;
2695 
2696  if (claimPlaceholder(BuiltinType::Overload)) {
2697  Self.ResolveAndFixSingleFunctionTemplateSpecialization(
2698  SrcExpr, /* Decay Function to ptr */ false,
2699  /* Complain */ true, DestRange, DestType,
2700  diag::err_bad_cstyle_cast_overload);
2701  if (SrcExpr.isInvalid())
2702  return;
2703  }
2704 
2705  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2706  return;
2707  }
2708 
2709  // If the type is dependent, we won't do any other semantic analysis now.
2710  if (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2711  SrcExpr.get()->isValueDependent()) {
2712  assert(Kind == CK_Dependent);
2713  return;
2714  }
2715 
2716  if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
2717  !isPlaceholder(BuiltinType::Overload)) {
2718  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2719  if (SrcExpr.isInvalid())
2720  return;
2721  }
2722 
2723  // AltiVec vector initialization with a single literal.
2724  if (const VectorType *vecTy = DestType->getAs<VectorType>()) {
2725  if (Self.CheckAltivecInitFromScalar(OpRange, DestType,
2726  SrcExpr.get()->getType())) {
2727  SrcExpr = ExprError();
2728  return;
2729  }
2730  if (Self.ShouldSplatAltivecScalarInCast(vecTy) &&
2731  (SrcExpr.get()->getType()->isIntegerType() ||
2732  SrcExpr.get()->getType()->isFloatingType())) {
2733  Kind = CK_VectorSplat;
2734  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2735  return;
2736  }
2737  }
2738 
2739  // C++ [expr.cast]p5: The conversions performed by
2740  // - a const_cast,
2741  // - a static_cast,
2742  // - a static_cast followed by a const_cast,
2743  // - a reinterpret_cast, or
2744  // - a reinterpret_cast followed by a const_cast,
2745  // can be performed using the cast notation of explicit type conversion.
2746  // [...] If a conversion can be interpreted in more than one of the ways
2747  // listed above, the interpretation that appears first in the list is used,
2748  // even if a cast resulting from that interpretation is ill-formed.
2749  // In plain language, this means trying a const_cast ...
2750  // Note that for address space we check compatibility after const_cast.
2751  unsigned msg = diag::err_bad_cxx_cast_generic;
2752  TryCastResult tcr = TryConstCast(Self, SrcExpr, DestType,
2753  /*CStyle*/ true, msg);
2754  if (SrcExpr.isInvalid())
2755  return;
2756  if (isValidCast(tcr))
2757  Kind = CK_NoOp;
2758 
2760  FunctionalStyle ? Sema::CCK_FunctionalCast : Sema::CCK_CStyleCast;
2761  if (tcr == TC_NotApplicable) {
2762  tcr = TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ true, msg,
2763  Kind);
2764  if (SrcExpr.isInvalid())
2765  return;
2766 
2767  if (tcr == TC_NotApplicable) {
2768  // ... or if that is not possible, a static_cast, ignoring const and
2769  // addr space, ...
2770  tcr = TryStaticCast(Self, SrcExpr, DestType, CCK, OpRange, msg, Kind,
2771  BasePath, ListInitialization);
2772  if (SrcExpr.isInvalid())
2773  return;
2774 
2775  if (tcr == TC_NotApplicable) {
2776  // ... and finally a reinterpret_cast, ignoring const and addr space.
2777  tcr = TryReinterpretCast(Self, SrcExpr, DestType, /*CStyle*/ true,
2778  OpRange, msg, Kind);
2779  if (SrcExpr.isInvalid())
2780  return;
2781  }
2782  }
2783  }
2784 
2785  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
2786  isValidCast(tcr))
2787  checkObjCConversion(CCK);
2788 
2789  if (tcr != TC_Success && msg != 0) {
2790  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2791  DeclAccessPair Found;
2792  FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
2793  DestType,
2794  /*Complain*/ true,
2795  Found);
2796  if (Fn) {
2797  // If DestType is a function type (not to be confused with the function
2798  // pointer type), it will be possible to resolve the function address,
2799  // but the type cast should be considered as failure.
2800  OverloadExpr *OE = OverloadExpr::find(SrcExpr.get()).Expression;
2801  Self.Diag(OpRange.getBegin(), diag::err_bad_cstyle_cast_overload)
2802  << OE->getName() << DestType << OpRange
2803  << OE->getQualifierLoc().getSourceRange();
2804  Self.NoteAllOverloadCandidates(SrcExpr.get());
2805  }
2806  } else {
2807  diagnoseBadCast(Self, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
2808  OpRange, SrcExpr.get(), DestType, ListInitialization);
2809  }
2810  }
2811 
2812  if (isValidCast(tcr)) {
2813  if (Kind == CK_BitCast)
2814  checkCastAlign();
2815 
2816  if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
2817  Self.Diag(OpRange.getBegin(), DiagID)
2818  << SrcExpr.get()->getType() << DestType << OpRange;
2819 
2820  } else {
2821  SrcExpr = ExprError();
2822  }
2823 }
2824 
2825 /// DiagnoseBadFunctionCast - Warn whenever a function call is cast to a
2826 /// non-matching type. Such as enum function call to int, int call to
2827 /// pointer; etc. Cast to 'void' is an exception.
2828 static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr,
2829  QualType DestType) {
2830  if (Self.Diags.isIgnored(diag::warn_bad_function_cast,
2831  SrcExpr.get()->getExprLoc()))
2832  return;
2833 
2834  if (!isa<CallExpr>(SrcExpr.get()))
2835  return;
2836 
2837  QualType SrcType = SrcExpr.get()->getType();
2838  if (DestType.getUnqualifiedType()->isVoidType())
2839  return;
2840  if ((SrcType->isAnyPointerType() || SrcType->isBlockPointerType())
2841  && (DestType->isAnyPointerType() || DestType->isBlockPointerType()))
2842  return;
2843  if (SrcType->isIntegerType() && DestType->isIntegerType() &&
2844  (SrcType->isBooleanType() == DestType->isBooleanType()) &&
2845  (SrcType->isEnumeralType() == DestType->isEnumeralType()))
2846  return;
2847  if (SrcType->isRealFloatingType() && DestType->isRealFloatingType())
2848  return;
2849  if (SrcType->isEnumeralType() && DestType->isEnumeralType())
2850  return;
2851  if (SrcType->isComplexType() && DestType->isComplexType())
2852  return;
2853  if (SrcType->isComplexIntegerType() && DestType->isComplexIntegerType())
2854  return;
2855  if (SrcType->isFixedPointType() && DestType->isFixedPointType())
2856  return;
2857 
2858  Self.Diag(SrcExpr.get()->getExprLoc(),
2859  diag::warn_bad_function_cast)
2860  << SrcType << DestType << SrcExpr.get()->getSourceRange();
2861 }
2862 
2863 /// Check the semantics of a C-style cast operation, in C.
2864 void CastOperation::CheckCStyleCast() {
2865  assert(!Self.getLangOpts().CPlusPlus);
2866 
2867  // C-style casts can resolve __unknown_any types.
2868  if (claimPlaceholder(BuiltinType::UnknownAny)) {
2869  SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2870  SrcExpr.get(), Kind,
2871  ValueKind, BasePath);
2872  return;
2873  }
2874 
2875  // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2876  // type needs to be scalar.
2877  if (DestType->isVoidType()) {
2878  // We don't necessarily do lvalue-to-rvalue conversions on this.
2879  SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2880  if (SrcExpr.isInvalid())
2881  return;
2882 
2883  // Cast to void allows any expr type.
2884  Kind = CK_ToVoid;
2885  return;
2886  }
2887 
2888  // If the type is dependent, we won't do any other semantic analysis now.
2889  if (Self.getASTContext().isDependenceAllowed() &&
2890  (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2891  SrcExpr.get()->isValueDependent())) {
2892  assert((DestType->containsErrors() || SrcExpr.get()->containsErrors() ||
2893  SrcExpr.get()->containsErrors()) &&
2894  "should only occur in error-recovery path.");
2895  assert(Kind == CK_Dependent);
2896  return;
2897  }
2898 
2899  // Overloads are allowed with C extensions, so we need to support them.
2900  if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2901  DeclAccessPair DAP;
2902  if (FunctionDecl *FD = Self.ResolveAddressOfOverloadedFunction(
2903  SrcExpr.get(), DestType, /*Complain=*/true, DAP))
2904  SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr.get(), DAP, FD);
2905  else
2906  return;
2907  assert(SrcExpr.isUsable());
2908  }
2909  SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2910  if (SrcExpr.isInvalid())
2911  return;
2912  QualType SrcType = SrcExpr.get()->getType();
2913 
2914  assert(!SrcType->isPlaceholderType());
2915 
2916  checkAddressSpaceCast(SrcType, DestType);
2917  if (SrcExpr.isInvalid())
2918  return;
2919 
2920  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
2921  diag::err_typecheck_cast_to_incomplete)) {
2922  SrcExpr = ExprError();
2923  return;
2924  }
2925 
2926  // Allow casting a sizeless built-in type to itself.
2927  if (DestType->isSizelessBuiltinType() &&
2928  Self.Context.hasSameUnqualifiedType(DestType, SrcType)) {
2929  Kind = CK_NoOp;
2930  return;
2931  }
2932 
2933  // Allow bitcasting between compatible SVE vector types.
2934  if ((SrcType->isVectorType() || DestType->isVectorType()) &&
2935  Self.isValidSveBitcast(SrcType, DestType)) {
2936  Kind = CK_BitCast;
2937  return;
2938  }
2939 
2940  if (!DestType->isScalarType() && !DestType->isVectorType() &&
2941  !DestType->isMatrixType()) {
2942  const RecordType *DestRecordTy = DestType->getAs<RecordType>();
2943 
2944  if (DestRecordTy && Self.Context.hasSameUnqualifiedType(DestType, SrcType)){
2945  // GCC struct/union extension: allow cast to self.
2946  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_nonscalar)
2947  << DestType << SrcExpr.get()->getSourceRange();
2948  Kind = CK_NoOp;
2949  return;
2950  }
2951 
2952  // GCC's cast to union extension.
2953  if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
2954  RecordDecl *RD = DestRecordTy->getDecl();
2955  if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
2956  Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
2957  << SrcExpr.get()->getSourceRange();
2958  Kind = CK_ToUnion;
2959  return;
2960  } else {
2961  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
2962  << SrcType << SrcExpr.get()->getSourceRange();
2963  SrcExpr = ExprError();
2964  return;
2965  }
2966  }
2967 
2968  // OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.
2969  if (Self.getLangOpts().OpenCL && DestType->isEventT()) {
2970  Expr::EvalResult Result;
2971  if (SrcExpr.get()->EvaluateAsInt(Result, Self.Context)) {
2972  llvm::APSInt CastInt = Result.Val.getInt();
2973  if (0 == CastInt) {
2974  Kind = CK_ZeroToOCLOpaqueType;
2975  return;
2976  }
2977  Self.Diag(OpRange.getBegin(),
2978  diag::err_opencl_cast_non_zero_to_event_t)
2979  << toString(CastInt, 10) << SrcExpr.get()->getSourceRange();
2980  SrcExpr = ExprError();
2981  return;
2982  }
2983  }
2984 
2985  // Reject any other conversions to non-scalar types.
2986  Self.Diag(OpRange.getBegin(), diag::err_typecheck_cond_expect_scalar)
2987  << DestType << SrcExpr.get()->getSourceRange();
2988  SrcExpr = ExprError();
2989  return;
2990  }
2991 
2992  // The type we're casting to is known to be a scalar, a vector, or a matrix.
2993 
2994  // Require the operand to be a scalar, a vector, or a matrix.
2995  if (!SrcType->isScalarType() && !SrcType->isVectorType() &&
2996  !SrcType->isMatrixType()) {
2997  Self.Diag(SrcExpr.get()->getExprLoc(),
2998  diag::err_typecheck_expect_scalar_operand)
2999  << SrcType << SrcExpr.get()->getSourceRange();
3000  SrcExpr = ExprError();
3001  return;
3002  }
3003 
3004  // C2x 6.5.4p4:
3005  // The type nullptr_t shall not be converted to any type other than void,
3006  // bool, or a pointer type. No type other than nullptr_t shall be converted
3007  // to nullptr_t.
3008  if (SrcType->isNullPtrType()) {
3009  // FIXME: 6.3.2.4p2 says that nullptr_t can be converted to itself, but
3010  // 6.5.4p4 is a constraint check and nullptr_t is not void, bool, or a
3011  // pointer type. We're not going to diagnose that as a constraint violation.
3012  if (!DestType->isVoidType() && !DestType->isBooleanType() &&
3013  !DestType->isPointerType() && !DestType->isNullPtrType()) {
3014  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_nullptr_cast)
3015  << /*nullptr to type*/ 0 << DestType;
3016  SrcExpr = ExprError();
3017  return;
3018  }
3019  if (!DestType->isNullPtrType()) {
3020  // Implicitly cast from the null pointer type to the type of the
3021  // destination.
3022  CastKind CK = DestType->isPointerType() ? CK_NullToPointer : CK_BitCast;
3023  SrcExpr = ImplicitCastExpr::Create(Self.Context, DestType, CK,
3024  SrcExpr.get(), nullptr, VK_PRValue,
3025  Self.CurFPFeatureOverrides());
3026  }
3027  }
3028  if (DestType->isNullPtrType() && !SrcType->isNullPtrType()) {
3029  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_nullptr_cast)
3030  << /*type to nullptr*/ 1 << SrcType;
3031  SrcExpr = ExprError();
3032  return;
3033  }
3034 
3035  if (DestType->isExtVectorType()) {
3036  SrcExpr = Self.CheckExtVectorCast(OpRange, DestType, SrcExpr.get(), Kind);
3037  return;
3038  }
3039 
3040  if (DestType->getAs<MatrixType>() || SrcType->getAs<MatrixType>()) {
3041  if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind))
3042  SrcExpr = ExprError();
3043  return;
3044  }
3045 
3046  if (const VectorType *DestVecTy = DestType->getAs<VectorType>()) {
3047  if (Self.CheckAltivecInitFromScalar(OpRange, DestType, SrcType)) {
3048  SrcExpr = ExprError();
3049  return;
3050  }
3051  if (Self.ShouldSplatAltivecScalarInCast(DestVecTy) &&
3052  (SrcType->isIntegerType() || SrcType->isFloatingType())) {
3053  Kind = CK_VectorSplat;
3054  SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
3055  } else if (Self.CheckVectorCast(OpRange, DestType, SrcType, Kind)) {
3056  SrcExpr = ExprError();
3057  }
3058  return;
3059  }
3060 
3061  if (SrcType->isVectorType()) {
3062  if (Self.CheckVectorCast(OpRange, SrcType, DestType, Kind))
3063  SrcExpr = ExprError();
3064  return;
3065  }
3066 
3067  // The source and target types are both scalars, i.e.
3068  // - arithmetic types (fundamental, enum, and complex)
3069  // - all kinds of pointers
3070  // Note that member pointers were filtered out with C++, above.
3071 
3072  if (isa<ObjCSelectorExpr>(SrcExpr.get())) {
3073  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_selector_expr);
3074  SrcExpr = ExprError();
3075  return;
3076  }
3077 
3078  // Can't cast to or from bfloat
3079  if (DestType->isBFloat16Type() && !SrcType->isBFloat16Type()) {
3080  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_to_bfloat16)
3081  << SrcExpr.get()->getSourceRange();
3082  SrcExpr = ExprError();
3083  return;
3084  }
3085  if (SrcType->isBFloat16Type() && !DestType->isBFloat16Type()) {
3086  Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_from_bfloat16)
3087  << SrcExpr.get()->getSourceRange();
3088  SrcExpr = ExprError();
3089  return;
3090  }
3091 
3092  // If either type is a pointer, the other type has to be either an
3093  // integer or a pointer.
3094  if (!DestType->isArithmeticType()) {
3095  if (!SrcType->isIntegralType(Self.Context) && SrcType->isArithmeticType()) {
3096  Self.Diag(SrcExpr.get()->getExprLoc(),
3097  diag::err_cast_pointer_from_non_pointer_int)
3098  << SrcType << SrcExpr.get()->getSourceRange();
3099  SrcExpr = ExprError();
3100  return;
3101  }
3102  checkIntToPointerCast(/* CStyle */ true, OpRange, SrcExpr.get(), DestType,
3103  Self);
3104  } else if (!SrcType->isArithmeticType()) {
3105  if (!DestType->isIntegralType(Self.Context) &&
3106  DestType->isArithmeticType()) {
3107  Self.Diag(SrcExpr.get()->getBeginLoc(),
3108  diag::err_cast_pointer_to_non_pointer_int)
3109  << DestType << SrcExpr.get()->getSourceRange();
3110  SrcExpr = ExprError();
3111  return;
3112  }
3113 
3114  if ((Self.Context.getTypeSize(SrcType) >
3115  Self.Context.getTypeSize(DestType)) &&
3116  !DestType->isBooleanType()) {
3117  // C 6.3.2.3p6: Any pointer type may be converted to an integer type.
3118  // Except as previously specified, the result is implementation-defined.
3119  // If the result cannot be represented in the integer type, the behavior
3120  // is undefined. The result need not be in the range of values of any
3121  // integer type.
3122  unsigned Diag;
3123  if (SrcType->isVoidPointerType())
3124  Diag = DestType->isEnumeralType() ? diag::warn_void_pointer_to_enum_cast
3125  : diag::warn_void_pointer_to_int_cast;
3126  else if (DestType->isEnumeralType())
3127  Diag = diag::warn_pointer_to_enum_cast;
3128  else
3129  Diag = diag::warn_pointer_to_int_cast;
3130  Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
3131  }
3132  }
3133 
3134  if (Self.getLangOpts().OpenCL && !Self.getOpenCLOptions().isAvailableOption(
3135  "cl_khr_fp16", Self.getLangOpts())) {
3136  if (DestType->isHalfType()) {
3137  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::err_opencl_cast_to_half)
3138  << DestType << SrcExpr.get()->getSourceRange();
3139  SrcExpr = ExprError();
3140  return;
3141  }
3142  }
3143 
3144  // ARC imposes extra restrictions on casts.
3145  if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers()) {
3146  checkObjCConversion(Sema::CCK_CStyleCast);
3147  if (SrcExpr.isInvalid())
3148  return;
3149 
3150  const PointerType *CastPtr = DestType->getAs<PointerType>();
3151  if (Self.getLangOpts().ObjCAutoRefCount && CastPtr) {
3152  if (const PointerType *ExprPtr = SrcType->getAs<PointerType>()) {
3153  Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
3154  Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
3155  if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
3156  ExprPtr->getPointeeType()->isObjCLifetimeType() &&
3157  !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
3158  Self.Diag(SrcExpr.get()->getBeginLoc(),
3159  diag::err_typecheck_incompatible_ownership)
3160  << SrcType << DestType << Sema::AA_Casting
3161  << SrcExpr.get()->getSourceRange();
3162  return;
3163  }
3164  }
3165  }
3166  else if (!Self.CheckObjCARCUnavailableWeakConversion(DestType, SrcType)) {
3167  Self.Diag(SrcExpr.get()->getBeginLoc(),
3168  diag::err_arc_convesion_of_weak_unavailable)
3169  << 1 << SrcType << DestType << SrcExpr.get()->getSourceRange();
3170  SrcExpr = ExprError();
3171  return;
3172  }
3173  }
3174 
3175  if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
3176  Self.Diag(OpRange.getBegin(), DiagID) << SrcType << DestType << OpRange;
3177 
3178  if (isa<PointerType>(SrcType) && isa<PointerType>(DestType)) {
3179  QualType SrcTy = cast<PointerType>(SrcType)->getPointeeType();
3180  QualType DestTy = cast<PointerType>(DestType)->getPointeeType();
3181 
3182  const RecordDecl *SrcRD = SrcTy->getAsRecordDecl();
3183  const RecordDecl *DestRD = DestTy->getAsRecordDecl();
3184 
3185  if (SrcRD && DestRD && SrcRD->hasAttr<RandomizeLayoutAttr>() &&
3186  SrcRD != DestRD) {
3187  // The struct we are casting the pointer from was randomized.
3188  Self.Diag(OpRange.getBegin(), diag::err_cast_from_randomized_struct)
3189  << SrcType << DestType;
3190  SrcExpr = ExprError();
3191  return;
3192  }
3193  }
3194 
3195  DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
3196  DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
3197  DiagnoseBadFunctionCast(Self, SrcExpr, DestType);
3198  Kind = Self.PrepareScalarCast(SrcExpr, DestType);
3199  if (SrcExpr.isInvalid())
3200  return;
3201 
3202  if (Kind == CK_BitCast)
3203  checkCastAlign();
3204 }
3205 
3206 void CastOperation::CheckBuiltinBitCast() {
3207  QualType SrcType = SrcExpr.get()->getType();
3208 
3209  if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
3210  diag::err_typecheck_cast_to_incomplete) ||
3211  Self.RequireCompleteType(OpRange.getBegin(), SrcType,
3212  diag::err_incomplete_type)) {
3213  SrcExpr = ExprError();
3214  return;
3215  }
3216 
3217  if (SrcExpr.get()->isPRValue())
3218  SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcType, SrcExpr.get(),
3219  /*IsLValueReference=*/false);
3220 
3221  CharUnits DestSize = Self.Context.getTypeSizeInChars(DestType);
3222  CharUnits SourceSize = Self.Context.getTypeSizeInChars(SrcType);
3223  if (DestSize != SourceSize) {
3224  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_type_size_mismatch)
3225  << (int)SourceSize.getQuantity() << (int)DestSize.getQuantity();
3226  SrcExpr = ExprError();
3227  return;
3228  }
3229 
3230  if (!DestType.isTriviallyCopyableType(Self.Context)) {
3231  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3232  << 1;
3233  SrcExpr = ExprError();
3234  return;
3235  }
3236 
3237  if (!SrcType.isTriviallyCopyableType(Self.Context)) {
3238  Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3239  << 0;
3240  SrcExpr = ExprError();
3241  return;
3242  }
3243 
3244  Kind = CK_LValueToRValueBitCast;
3245 }
3246 
3247 /// DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either
3248 /// const, volatile or both.
3249 static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
3250  QualType DestType) {
3251  if (SrcExpr.isInvalid())
3252  return;
3253 
3254  QualType SrcType = SrcExpr.get()->getType();
3255  if (!((SrcType->isAnyPointerType() && DestType->isAnyPointerType()) ||
3256  DestType->isLValueReferenceType()))
3257  return;
3258 
3259  QualType TheOffendingSrcType, TheOffendingDestType;
3260  Qualifiers CastAwayQualifiers;
3261  if (CastsAwayConstness(Self, SrcType, DestType, true, false,
3262  &TheOffendingSrcType, &TheOffendingDestType,
3263  &CastAwayQualifiers) !=
3264  CastAwayConstnessKind::CACK_Similar)
3265  return;
3266 
3267  // FIXME: 'restrict' is not properly handled here.
3268  int qualifiers = -1;
3269  if (CastAwayQualifiers.hasConst() && CastAwayQualifiers.hasVolatile()) {
3270  qualifiers = 0;
3271  } else if (CastAwayQualifiers.hasConst()) {
3272  qualifiers = 1;
3273  } else if (CastAwayQualifiers.hasVolatile()) {
3274  qualifiers = 2;
3275  }
3276  // This is a variant of int **x; const int **y = (const int **)x;
3277  if (qualifiers == -1)
3278  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual2)
3279  << SrcType << DestType;
3280  else
3281  Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual)
3282  << TheOffendingSrcType << TheOffendingDestType << qualifiers;
3283 }
3284 
3286  TypeSourceInfo *CastTypeInfo,
3287  SourceLocation RPLoc,
3288  Expr *CastExpr) {
3289  CastOperation Op(*this, CastTypeInfo->getType(), CastExpr);
3290  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3291  Op.OpRange = SourceRange(LPLoc, CastExpr->getEndLoc());
3292 
3293  if (getLangOpts().CPlusPlus) {
3294  Op.CheckCXXCStyleCast(/*FunctionalCast=*/ false,
3295  isa<InitListExpr>(CastExpr));
3296  } else {
3297  Op.CheckCStyleCast();
3298  }
3299 
3300  if (Op.SrcExpr.isInvalid())
3301  return ExprError();
3302 
3303  // -Wcast-qual
3304  DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
3305 
3306  return Op.complete(CStyleCastExpr::Create(
3307  Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
3308  &Op.BasePath, CurFPFeatureOverrides(), CastTypeInfo, LPLoc, RPLoc));
3309 }
3310 
3312  QualType Type,
3313  SourceLocation LPLoc,
3314  Expr *CastExpr,
3315  SourceLocation RPLoc) {
3316  assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
3317  CastOperation Op(*this, Type, CastExpr);
3318  Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3319  Op.OpRange = SourceRange(Op.DestRange.getBegin(), CastExpr->getEndLoc());
3320 
3321  Op.CheckCXXCStyleCast(/*FunctionalCast=*/true, /*ListInit=*/false);
3322  if (Op.SrcExpr.isInvalid())
3323  return ExprError();
3324 
3325  auto *SubExpr = Op.SrcExpr.get();
3326  if (auto *BindExpr = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
3327  SubExpr = BindExpr->getSubExpr();
3328  if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
3329  ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
3330 
3331  return Op.complete(CXXFunctionalCastExpr::Create(
3332  Context, Op.ResultType, Op.ValueKind, CastTypeInfo, Op.Kind,
3333  Op.SrcExpr.get(), &Op.BasePath, CurFPFeatureOverrides(), LPLoc, RPLoc));
3334 }
clang::Type::isIntegralType
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1954
clang::BuiltinType
This class is used for builtin types like 'int'.
Definition: Type.h:2625
clang::Type::isRecordType
bool isRecordType() const
Definition: Type.h:6984
clang::TokenValue
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:89
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:1615
clang::QualType::getCVRQualifiers
unsigned getCVRQualifiers() const
Retrieve the set of CVR (const-volatile-restrict) qualifiers applied to this type.
Definition: Type.h:6679
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:20947
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:1553
clang::Type::isBlockPointerType
bool isBlockPointerType() const
Definition: Type.h:6902
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:4621
clang::OK_Ordinary
@ OK_Ordinary
An ordinary object is located at an address in memory.
Definition: Specifiers.h:139
clang::TypeSourceInfo::getType
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6615
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:271
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:23
clang::Type::isVoidPointerType
bool isVoidPointerType() const
Definition: Type.cpp:593
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:560
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:357
clang::DiagnosticOptions::MSVC
@ MSVC
Definition: DiagnosticOptions.h:77
clang::Qualifiers::fromCVRMask
static Qualifiers fromCVRMask(unsigned CVR)
Definition: Type.h:239
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:97
clang::Sema::getASTContext
ASTContext & getASTContext() const
Definition: Sema.h:1656
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:79
argTypeIsABIEquivalent
static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType, ASTContext &Context)
Definition: SemaCast.cpp:1049
clang::TagDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:4422
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:154
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:1900
llvm::SmallVector
Definition: LLVM.h:38
clang::Sema::ACR_unbridged
@ ACR_unbridged
Definition: Sema.h:12727
clang::OverloadExpr::getQualifierLoc
NestedNameSpecifierLoc getQualifierLoc() const
Fetches the nested-name qualifier with source-location information, if one was given.
Definition: ExprCXX.h:3075
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::BuiltinType::Kind
Kind
Definition: Type.h:2627
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6673
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:911
TryReinterpretCast
static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2214
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:1276
clang::OR_Success
@ OR_Success
Overload resolution succeeded.
Definition: Overload.h:52
TargetInfo.h
fixOverloadedReinterpretCastExpr
static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType, ExprResult &Result)
Definition: SemaCast.cpp:2186
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:6842
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3532
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:325
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:1488
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:736
clang::Expr::getObjectKind
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:438
clang::Type::isScalarType
bool isScalarType() const
Definition: Type.h:7278
clang::Type::isMatrixType
bool isMatrixType() const
Definition: Type.h:7010
clang::Type::isFunctionNoProtoType
bool isFunctionNoProtoType() const
Definition: Type.h:2148
clang::Sema::AR_accessible
@ AR_accessible
Definition: Sema.h:7847
clang::InitializationSequence::Failed
bool Failed() const
Determine whether the initialization sequence is invalid.
Definition: Initialization.h:1221
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:709
clang::QualType::getCanonicalType
QualType getCanonicalType() const
Definition: Type.h:6685
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:4386
clang::Type::isFloatingType
bool isFloatingType() const
Definition: Type.cpp:2145
clang::Qualifiers
The collection of all-type qualifiers we support.
Definition: Type.h:146
clang::TargetInfo::getCXXABI
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1265
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID, bool DeferHint=false)
Emit a diagnostic.
Definition: Sema.cpp:1888
clang::Sema::CreateMaterializeTemporaryExpr
MaterializeTemporaryExpr * CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary, bool BoundToLvalueReference)
Definition: SemaInit.cpp:8255
clang::LangOptions::allowsNonTrivialObjCLifetimeQualifiers
bool allowsNonTrivialObjCLifetimeQualifiers() const
True if any ObjC types may have non-trivial lifetime qualifiers.
Definition: LangOptions.h:555
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:2161
clang::Sema::AR_dependent
@ AR_dependent
Definition: Sema.h:7849
clang::ASTContext::OverloadTy
CanQualType OverloadTy
Definition: ASTContext.h:1105
clang::RecordDecl::getDefinition
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:4208
clang::Sema::BuildBasePathArray
void BuildBasePathArray(const CXXBasePaths &Paths, CXXCastPath &BasePath)
Definition: SemaDeclCXX.cpp:2945
clang::TypeLoc::getEndLoc
SourceLocation getEndLoc() const
Get the end source location.
Definition: TypeLoc.cpp:234
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:2072
clang::Expr::isPRValue
bool isPRValue() const
Definition: Expr.h:272
clang::MemberPointerType::isMemberFunctionPointer
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:2985
clang::QualType::getAsString
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:1089
clang::TagType
Definition: Type.h:4797
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:7191
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:15384
TryAddressSpaceCast
static TryCastResult TryAddressSpaceCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2561
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:6125
clang::Sema::CCK_FunctionalCast
@ CCK_FunctionalCast
A functional-style cast.
Definition: Sema.h:12203
clang::InitializationSequence::getFailureKind
FailureKind getFailureKind() const
Determine why initialization failed.
Definition: Initialization.h:1406
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:17640
clang::Sema::ResolveAndFixSingleFunctionTemplateSpecialization
bool ResolveAndFixSingleFunctionTemplateSpecialization(ExprResult &SrcExpr, bool DoFunctionPointerConversion=false, bool Complain=false, SourceRange OpRangeForComplaining=SourceRange(), QualType DestTypeForComplaining=QualType(), unsigned DiagIDForComplaining=0)
Definition: SemaOverload.cpp:12843
clang::Type::isRValueReferenceType
bool isRValueReferenceType() const
Definition: Type.h:6914
clang::InitializationSequence
Describes the sequence of initializations required to initialize a given object or reference with a s...
Definition: Initialization.h:788
DiagnoseCastOfObjCSEL
static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:2053
clang::IdentifierInfo::getTokenID
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
Definition: IdentifierTable.h:262
clang::Qualifiers::compatiblyIncludes
bool compatiblyIncludes(Qualifiers other) const
Determines if these qualifiers compatibly include another set.
Definition: Type.h:531
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3680
clang::Sema::BuildCXXFunctionalCastExpr
ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type, SourceLocation LParenLoc, Expr *CastExpr, SourceLocation RParenLoc)
Definition: SemaCast.cpp:3311
clang::Qualifiers::hasConst
bool hasConst() const
Definition: Type.h:263
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:16110
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:831
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:552
clang::Expr::isGLValue
bool isGLValue() const
Definition: Expr.h:274
clang::Sema::AR_delayed
@ AR_delayed
Definition: Sema.h:7850
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:843
clang::Sema::CCK_OtherCast
@ CCK_OtherCast
A cast other than a C-style cast.
Definition: Sema.h:12205
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:409
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1566
Preprocessor.h
clang::Sema::GetTypeForDeclaratorCast
TypeSourceInfo * GetTypeForDeclaratorCast(Declarator &D, QualType FromTy)
Definition: SemaType.cpp:6037
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:494
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:12599
clang::ASTContext::ARCUnbridgedCastTy
CanQualType ARCUnbridgedCastTy
Definition: ASTContext.h:1107
clang::OverloadExpr::find
static FindResult find(Expr *E)
Finds the overloaded expression in the given expression E of OverloadTy.
Definition: ExprCXX.h:3014
clang::Type::containsErrors
bool containsErrors() const
Whether this type is an error type.
Definition: Type.h:2302
clang::Type::isExtVectorType
bool isExtVectorType() const
Definition: Type.h:7000
Offset
unsigned Offset
Definition: Format.cpp:2774
clang::QualType::isAddressSpaceOverlapping
bool isAddressSpaceOverlapping(QualType T) const
Returns true if address space qualifiers overlap with T address space qualifiers.
Definition: Type.h:1173
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:3069
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:1649
clang::ReferenceType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2903
APSInt
llvm::APSInt APSInt
Definition: ByteCodeEmitter.cpp:20
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:6823
getCastAwayConstnessCastKind
static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK, unsigned &DiagID)
Definition: SemaCast.cpp:734
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:8722
clang::Sema::CheckTollFreeBridgeStaticCast
bool CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, CastKind &Kind)
Definition: SemaExprObjC.cpp:4202
clang::InitializationSequence::getFailedOverloadResult
OverloadingResult getFailedOverloadResult() const
Get the overloading result, for when the initialization sequence failed due to a bad overload.
Definition: Initialization.h:1394
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6906
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:186
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4821
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:3063
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:3162
clang::OCD_ViableCandidates
@ OCD_ViableCandidates
Requests that only viable candidates be shown.
Definition: Overload.h:70
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:958
clang::PartialDiagnosticAt
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs.
Definition: PartialDiagnostic.h:205
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:3163
clang::Sema::CurFPFeatureOverrides
FPOptionsOverride CurFPFeatureOverrides()
Definition: Sema.h:699
clang::Type::isMemberFunctionPointerType
bool isMemberFunctionPointerType() const
Definition: Type.h:6946
clang::Sema::CheckMatrixCast
bool CheckMatrixCast(SourceRange R, QualType DestTy, QualType SrcTy, CastKind &Kind)
Definition: SemaExpr.cpp:8058
clang::QualType::getAddressSpace
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:6767
clang::Sema::Ref_Incompatible
@ Ref_Incompatible
Ref_Incompatible - The two types are incompatible, so direct reference binding is not possible.
Definition: Sema.h:12652
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:11912
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:1543
clang::InitializationSequence::FK_ParenthesizedListInitFailed
@ FK_ParenthesizedListInitFailed
Parenthesized list initialization failed at some point.
Definition: Initialization.h:1109
clang::Type::isNullPtrType
bool isNullPtrType() const
Definition: Type.h:7216
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:6923
clang::Type::isAnyCharacterType
bool isAnyCharacterType() const
Determine whether this type is any of the built-in character types.
Definition: Type.cpp:2021
clang::Sema::RequireNonAbstractType
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Definition: SemaDeclCXX.cpp:5827
clang::Type::isFunctionPointerType
bool isFunctionPointerType() const
Definition: Type.h:6928
clang::threadSafety::sx::toString
std::string toString(const til::SExpr *E)
Definition: ThreadSafetyCommon.h:91
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:3363
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:182
clang::CPlusPlus
@ CPlusPlus
Definition: LangStandard.h:53
TC_NotApplicable
@ TC_NotApplicable
The cast method is not applicable.
Definition: SemaCast.cpp:34
clang::MemberPointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2981
clang::Qualifiers::getCVRQualifiers
unsigned getCVRQualifiers() const
Definition: Type.h:294
clang::Qualifiers::removeConst
void removeConst()
Definition: Type.h:265
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:7397
clang::Type::isComplexType
bool isComplexType() const
isComplexType() does not include complex integers (a GCC extension).
Definition: Type.cpp:605
clang::OK_BitField
@ OK_BitField
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:142
clang::Decl::isInvalidDecl
bool isInvalidDecl() const
Definition: DeclBase.h:571
clang::BuiltinBitCastExpr
Represents a C++2a __builtin_bit_cast(T, v) expression.
Definition: ExprCXX.h:5111
clang::OCD_AmbiguousCandidates
@ OCD_AmbiguousCandidates
Requests that only tied-for-best candidates be shown.
Definition: Overload.h:73
clang::Sema::ShouldSplatAltivecScalarInCast
bool ShouldSplatAltivecScalarInCast(const VectorType *VecTy)
Definition: SemaCast.cpp:2645
clang::FunctionType::getCallConv
CallingConv getCallConv() const
Definition: Type.h:3956
clang::Sema::Diags
DiagnosticsEngine & Diags
Definition: Sema.h:411
clang::Type::isVectorType
bool isVectorType() const
Definition: Type.h:6996
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:1768
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:639
unwrapCastAwayConstnessLevel
static CastAwayConstnessKind unwrapCastAwayConstnessLevel(ASTContext &Context, QualType &T1, QualType &T2)
Unwrap one level of types for CastsAwayConstness.
Definition: SemaCast.cpp:561
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:3249
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:8014
clang::Type::isLValueReferenceType
bool isLValueReferenceType() const
Definition: Type.h:6910
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:2273
clang::Stmt::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:349
clang::InitializationSequence::getFailedCandidateSet
OverloadCandidateSet & getFailedCandidateSet()
Retrieve a reference to the candidate set when overload resolution fails.
Definition: Initialization.h:1388
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:2063
clang::Sema::BuildCStyleCastExpr
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty, SourceLocation RParenLoc, Expr *Op)
Definition: SemaCast.cpp:3285
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6890
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:6176
llvm::SmallString
Definition: LLVM.h:37
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:623
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:817
clang::TypeInfoChars::Width
CharUnits Width
Definition: ASTContext.h:167
ASTContext.h
clang::Sema::ReferenceCompareResult
ReferenceCompareResult
ReferenceCompareResult - Expresses the result of comparing two types (cv1 T1 and cv2 T2) to determine...
Definition: Sema.h:12649
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:266
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:629
clang::ASTContext::getCanonicalType
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2499
clang::CXXRecordDecl::isDerivedFrom
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
Definition: CXXInheritance.cpp:67
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:1783
clang::TagDecl::isUnion
bool isUnion() const
Definition: Decl.h:3642
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:61
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:2995
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:7929
clang::Type::getAsPlaceholderType
const BuiltinType * getAsPlaceholderType() const
Definition: Type.h:7173
clang::TagDecl::isCompleteDefinition
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3541
clang::Type::isEnumeralType
bool isEnumeralType() const
Definition: Type.h:6988
clang::VectorType::AltiVecPixel
@ AltiVecPixel
is AltiVec 'vector Pixel'
Definition: Type.h:3373
clang::CastExpr::getTargetFieldForToUnionCast
static const FieldDecl * getTargetFieldForToUnionCast(QualType unionType, QualType opType)
Definition: Expr.cpp:2023
clang::Sema::CheckAltivecInitFromScalar
bool CheckAltivecInitFromScalar(SourceRange R, QualType VecTy, QualType SrcTy)
Definition: SemaCast.cpp:2658
clang::OK_MatrixComponent
@ OK_MatrixComponent
A matrix component is a single element of a matrix.
Definition: Specifiers.h:157
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:11973
clang::VectorType::getVectorKind
VectorKind getVectorKind() const
Definition: Type.h:3410
clang::Sema::LangOpts
const LangOptions & LangOpts
Definition: Sema.h:407
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6726
clang::Type::isObjCLifetimeType
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:4441
clang::Type::isObjCObjectPointerType
bool isObjCObjectPointerType() const
Definition: Type.h:7022
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:1581
clang::IdentifierInfo::isKeyword
bool isKeyword(const LangOptions &LangOpts) const
Return true if this token is a keyword in the specified language.
Definition: IdentifierTable.cpp:330
clang::CXXBasePaths::end
paths_iterator end()
Definition: CXXInheritance.h:183
clang::QualType::withCVRQualifiers
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:935
clang::OverloadCandidateSet
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13....
Definition: Overload.h:951
clang::OCD_AllCandidates
@ OCD_AllCandidates
Requests that all candidates be shown.
Definition: Overload.h:67
IsAddressSpaceConversion
static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType)
Definition: SemaCast.cpp:1262
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:494
clang::Type::isArithmeticType
bool isArithmeticType() const
Definition: Type.cpp:2176
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7464
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:8307
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:254
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:2160
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:2308
clang::VK_PRValue
@ VK_PRValue
A pr-value expression (in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:123
clang::FunctionType::getNameForCallConv
static StringRef getNameForCallConv(CallingConv CC)
Definition: Type.cpp:3179
clang::VectorType::AltiVecVector
@ AltiVecVector
is AltiVec vector
Definition: Type.h:3370
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:2506
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:2880
clang::Type::isMemberPointerType
bool isMemberPointerType() const
Definition: Type.h:6942
clang::Type::isPointerType
bool isPointerType() const
Definition: Type.h:6894
clang::OR_No_Viable_Function
@ OR_No_Viable_Function
No viable function found.
Definition: Overload.h:55
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:169
clang::OverloadCandidateDisplayKind
OverloadCandidateDisplayKind
Definition: Overload.h:64
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:6063
clang::ast_matchers::castExpr
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang's AST.
Definition: ASTMatchersInternal.cpp:977
clang::Type::isComplexIntegerType
bool isComplexIntegerType() const
Definition: Type.cpp:611
clang::Sema::CCK_CStyleCast
@ CCK_CStyleCast
A C-style cast.
Definition: Sema.h:12201
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:4021
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:330
clang::VectorType::VectorKind
VectorKind
Definition: Type.h:3365
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:794
clang::Type::isSizelessBuiltinType
bool isSizelessBuiltinType() const
Definition: Type.cpp:2329
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:803
clang::Type::isBFloat16Type
bool isBFloat16Type() const
Definition: Type.h:7204
clang::Sema::AR_inaccessible
@ AR_inaccessible
Definition: Sema.h:7848
clang::InitializationKind::CreateFunctionalCast
static InitializationKind CreateFunctionalCast(SourceRange TypeRange, bool InitList)
Create a direct initialization for a functional cast.
Definition: Initialization.h:665
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:3036
clang::InitializationSequence::isConstructorInitialization
bool isConstructorInitialization() const
Determine whether this initialization is direct call to a constructor.
Definition: SemaInit.cpp:3606
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:358
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:1845
clang::Sema::CheckExtraCXXDefaultArguments
void CheckExtraCXXDefaultArguments(Declarator &D)
CheckExtraCXXDefaultArguments - Check for any extra default arguments in the declarator,...
Definition: SemaDeclCXX.cpp:407
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:12725
clang::InitializationSequence::FK_ConstructorOverloadFailed
@ FK_ConstructorOverloadFailed
Overloading for initialization by constructor failed.
Definition: Initialization.h:1079
clang::Type::getAsRecordDecl
RecordDecl * getAsRecordDecl() const
Retrieves the RecordDecl this type refers to.
Definition: Type.cpp:1787
clang::Declarator::isInvalidType
bool isInvalidType() const
Definition: DeclSpec.h:2627
clang::OR_Ambiguous
@ OR_Ambiguous
Ambiguous candidates found.
Definition: Overload.h:58
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:2042
clang::OverloadExpr
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr.
Definition: ExprCXX.h:2954
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:735
clang::Qualifiers::hasVolatile
bool hasVolatile() const
Definition: Type.h:273
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:145
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:7167
clang::ExprValueKind
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:120
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:85
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:743
clang::VectorType::AltiVecBool
@ AltiVecBool
is AltiVec 'vector bool ...'
Definition: Type.h:3376
clang::Qualifiers::removeObjCGCAttr
void removeObjCGCAttr()
Definition: Type.h:329
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:7307
clang::MemberPointerType
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2965
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:1727
clang::InitializationKind
Describes the kind of initialization being performed, along with location information for tokens rela...
Definition: Initialization.h:566
clang::ActionResult< Expr * >
clang::Type::isObjCObjectType
bool isObjCObjectType() const
Definition: Type.h:7026
clang::Sema::getPreprocessor
Preprocessor & getPreprocessor() const
Definition: Sema.h:1655
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:2828
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:12666
clang::RValueReferenceType
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2947
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:149
clang::Type::isEventT
bool isEventT() const
Definition: Type.h:7091
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2774
clang::Type::isHalfType
bool isHalfType() const
Definition: Type.h:7195
clang::CanQual::getUnqualifiedType
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
Definition: CanonicalType.h:619
clang::Sema::AA_Casting
@ AA_Casting
Definition: Sema.h:3710
clang::Builtin::ID
ID
Definition: Builtins.h:64
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:6898
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:1834
clang::OverloadExpr::FindResult::Expression
OverloadExpr * Expression
Definition: ExprCXX.h:3004
clang::Expr::isIntegerConstantExpr
bool isIntegerConstantExpr(const ASTContext &Ctx, SourceLocation *Loc=nullptr) const
Definition: ExprConstant.cpp:15993
clang::ASTContext::hasCvrSimilarType
bool hasCvrSimilarType(QualType T1, QualType T2)
Determine if two types are similar, ignoring only CVR qualifiers.
Definition: ASTContext.cpp:6225
clang::Sema::isCompleteType
bool isCompleteType(SourceLocation Loc, QualType T, CompleteTypeKind Kind=CompleteTypeKind::Default)
Definition: Sema.h:2474
clang::Expr::getType
QualType getType() const
Definition: Expr.h:142
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:6604
clang::FunctionType::getReturnType
QualType getReturnType() const
Definition: Type.h:3945
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:337
CT_Addrspace
@ CT_Addrspace
addrspace_cast
Definition: SemaCast.cpp:53
clang::InitializedEntity
Describes an entity that is being initialized.
Definition: Initialization.h:47
clang::Qualifiers::removeObjCLifetime
void removeObjCLifetime()
Definition: Type.h:357
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:3276
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:6633
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4831
clang::InitializationSequence::FK_UserConversionOverloadFailed
@ FK_UserConversionOverloadFailed
Overloading for a user-defined conversion failed.
Definition: Initialization.h:1076
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:652
clang::InitializedEntity::InitializeTemporary
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
Definition: Initialization.h:332
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:3389
clang::ReferenceType
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2885
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:2784
clang::ASTContext::getTypeInfoInChars
TypeInfoChars getTypeInfoInChars(const Type *T) const
Definition: ASTContext.cpp:1930
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2515
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:463
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:648
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:7236
clang::Sema::areVectorTypesSameSize
bool areVectorTypesSameSize(QualType srcType, QualType destType)
Definition: SemaExpr.cpp:7958
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:2003
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:7223
clang::Type::isFunctionReferenceType
bool isFunctionReferenceType() const
Definition: Type.h:6935
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:2542
clang::Expr
This represents one expression.
Definition: Expr.h:110
clang::Expr::getValueKindForType
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:421
clang::Preprocessor
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:128
clang::CXXBasePaths::begin
paths_iterator begin()
Definition: CXXInheritance.h:182
checkCastFunctionType
static unsigned int checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:1063
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:2092
clang::EnumType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums.
Definition: Type.h:4847
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3482
DiagList
TextDiagnosticBuffer::DiagList DiagList
Definition: VerifyDiagnosticConsumer.cpp:83
clang::Sema::CheckedConversionKind
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:12197
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1917
clang::Sema::Ref_Compatible
@ Ref_Compatible
Ref_Compatible - The two types are reference-compatible.
Definition: Sema.h:12658
clang::RecordDecl
Represents a struct/union/class.
Definition: Decl.h:3996
clang::OverloadCandidateSet::empty
bool empty() const
Definition: Overload.h:1130
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:2057
clang::MatrixType
Represents a matrix type, as defined in the Matrix Types clang extensions.
Definition: Type.h:3553
clang::ASTContext::getLangOpts
const LangOptions & getLangOpts() const
Definition: ASTContext.h:761
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:185
clang::InitializationKind::CreateCStyleCast
static InitializationKind CreateCStyleCast(SourceLocation StartLoc, SourceRange TypeRange, bool InitList)
Create a direct initialization for a C-style cast.
Definition: Initialization.h:654
clang::Preprocessor::getIdentifierInfo
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Definition: Preprocessor.h:1378
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:134
clang::Sema::PrepareCastToObjCObjectPointer
CastKind PrepareCastToObjCObjectPointer(ExprResult &E)
Prepare a conversion of the given expression to an ObjC object pointer type.
Definition: SemaExpr.cpp:7682
clang::Type::isIntegralOrEnumerationType
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:7294
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:1863
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:3591
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:2094
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:2110
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1995