clang 19.0.0git
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
19#include "clang/AST/ExprCXX.h"
20#include "clang/AST/ExprObjC.h"
27#include "llvm/ADT/SmallVector.h"
28#include "llvm/ADT/StringExtras.h"
29#include <set>
30using namespace clang;
31
32
33
35 TC_NotApplicable, ///< The cast method is not applicable.
36 TC_Success, ///< The cast method is appropriate and successful.
37 TC_Extension, ///< The cast method is appropriate and accepted as a
38 ///< language extension.
39 TC_Failed ///< The cast method is appropriate, but failed. A
40 ///< diagnostic has been emitted.
41};
42
43static bool isValidCast(TryCastResult TCR) {
44 return TCR == TC_Success || TCR == TC_Extension;
45}
46
48 CT_Const, ///< const_cast
49 CT_Static, ///< static_cast
50 CT_Reinterpret, ///< reinterpret_cast
51 CT_Dynamic, ///< dynamic_cast
52 CT_CStyle, ///< (Type)expr
53 CT_Functional, ///< Type(expr)
54 CT_Addrspace ///< addrspace_cast
55};
56
57namespace {
58 struct CastOperation {
59 CastOperation(Sema &S, QualType destType, ExprResult src)
60 : Self(S), SrcExpr(src), DestType(destType),
61 ResultType(destType.getNonLValueExprType(S.Context)),
62 ValueKind(Expr::getValueKindForType(destType)),
63 Kind(CK_Dependent), IsARCUnbridgedCast(false) {
64
65 // C++ [expr.type]/8.2.2:
66 // If a pr-value initially has the type cv-T, where T is a
67 // cv-unqualified non-class, non-array type, the type of the
68 // expression is adjusted to T prior to any further analysis.
69 // C23 6.5.4p6:
70 // Preceding an expression by a parenthesized type name converts the
71 // value of the expression to the unqualified, non-atomic version of
72 // the named type.
73 if (!S.Context.getLangOpts().ObjC && !DestType->isRecordType() &&
74 !DestType->isArrayType()) {
75 DestType = DestType.getAtomicUnqualifiedType();
76 }
77
78 if (const BuiltinType *placeholder =
79 src.get()->getType()->getAsPlaceholderType()) {
80 PlaceholderKind = placeholder->getKind();
81 } else {
82 PlaceholderKind = (BuiltinType::Kind) 0;
83 }
84 }
85
86 Sema &Self;
87 ExprResult SrcExpr;
88 QualType DestType;
89 QualType ResultType;
90 ExprValueKind ValueKind;
92 BuiltinType::Kind PlaceholderKind;
93 CXXCastPath BasePath;
94 bool IsARCUnbridgedCast;
95
96 SourceRange OpRange;
97 SourceRange DestRange;
98
99 // Top-level semantics-checking routines.
100 void CheckConstCast();
101 void CheckReinterpretCast();
102 void CheckStaticCast();
103 void CheckDynamicCast();
104 void CheckCXXCStyleCast(bool FunctionalCast, bool ListInitialization);
105 void CheckCStyleCast();
106 void CheckBuiltinBitCast();
107 void CheckAddrspaceCast();
108
109 void updatePartOfExplicitCastFlags(CastExpr *CE) {
110 // Walk down from the CE to the OrigSrcExpr, and mark all immediate
111 // ImplicitCastExpr's as being part of ExplicitCastExpr. The original CE
112 // (which is a ExplicitCastExpr), and the OrigSrcExpr are not touched.
113 for (; auto *ICE = dyn_cast<ImplicitCastExpr>(CE->getSubExpr()); CE = ICE)
114 ICE->setIsPartOfExplicitCast(true);
115 }
116
117 /// Complete an apparently-successful cast operation that yields
118 /// the given expression.
119 ExprResult complete(CastExpr *castExpr) {
120 // If this is an unbridged cast, wrap the result in an implicit
121 // cast that yields the unbridged-cast placeholder type.
122 if (IsARCUnbridgedCast) {
124 Self.Context, Self.Context.ARCUnbridgedCastTy, CK_Dependent,
125 castExpr, nullptr, castExpr->getValueKind(),
126 Self.CurFPFeatureOverrides());
127 }
128 updatePartOfExplicitCastFlags(castExpr);
129 return castExpr;
130 }
131
132 // Internal convenience methods.
133
134 /// Try to handle the given placeholder expression kind. Return
135 /// true if the source expression has the appropriate placeholder
136 /// kind. A placeholder can only be claimed once.
137 bool claimPlaceholder(BuiltinType::Kind K) {
138 if (PlaceholderKind != K) return false;
139
140 PlaceholderKind = (BuiltinType::Kind) 0;
141 return true;
142 }
143
144 bool isPlaceholder() const {
145 return PlaceholderKind != 0;
146 }
147 bool isPlaceholder(BuiltinType::Kind K) const {
148 return PlaceholderKind == K;
149 }
150
151 // Language specific cast restrictions for address spaces.
152 void checkAddressSpaceCast(QualType SrcType, QualType DestType);
153
154 void checkCastAlign() {
155 Self.CheckCastAlign(SrcExpr.get(), DestType, OpRange);
156 }
157
158 void checkObjCConversion(Sema::CheckedConversionKind CCK) {
159 assert(Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers());
160
161 Expr *src = SrcExpr.get();
162 if (Self.CheckObjCConversion(OpRange, DestType, src, CCK) ==
164 IsARCUnbridgedCast = true;
165 SrcExpr = src;
166 }
167
168 /// Check for and handle non-overload placeholder expressions.
169 void checkNonOverloadPlaceholders() {
170 if (!isPlaceholder() || isPlaceholder(BuiltinType::Overload))
171 return;
172
173 SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
174 if (SrcExpr.isInvalid())
175 return;
176 PlaceholderKind = (BuiltinType::Kind) 0;
177 }
178 };
179
180 void CheckNoDeref(Sema &S, const QualType FromType, const QualType ToType,
181 SourceLocation OpLoc) {
182 if (const auto *PtrType = dyn_cast<PointerType>(FromType)) {
183 if (PtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
184 if (const auto *DestType = dyn_cast<PointerType>(ToType)) {
185 if (!DestType->getPointeeType()->hasAttr(attr::NoDeref)) {
186 S.Diag(OpLoc, diag::warn_noderef_to_dereferenceable_pointer);
187 }
188 }
189 }
190 }
191 }
192
193 struct CheckNoDerefRAII {
194 CheckNoDerefRAII(CastOperation &Op) : Op(Op) {}
195 ~CheckNoDerefRAII() {
196 if (!Op.SrcExpr.isInvalid())
197 CheckNoDeref(Op.Self, Op.SrcExpr.get()->getType(), Op.ResultType,
198 Op.OpRange.getBegin());
199 }
200
201 CastOperation &Op;
202 };
203}
204
205static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
206 QualType DestType);
207
208// The Try functions attempt a specific way of casting. If they succeed, they
209// return TC_Success. If their way of casting is not appropriate for the given
210// arguments, they return TC_NotApplicable and *may* set diag to a diagnostic
211// to emit if no other way succeeds. If their way of casting is appropriate but
212// fails, they return TC_Failed and *must* set diag; they can set it to 0 if
213// they emit a specialized diagnostic.
214// All diagnostics returned by these functions must expect the same three
215// arguments:
216// %0: Cast Type (a value from the CastType enumeration)
217// %1: Source Type
218// %2: Destination Type
220 QualType DestType, bool CStyle,
221 CastKind &Kind,
222 CXXCastPath &BasePath,
223 unsigned &msg);
225 QualType DestType, bool CStyle,
226 SourceRange OpRange,
227 unsigned &msg,
228 CastKind &Kind,
229 CXXCastPath &BasePath);
231 QualType DestType, bool CStyle,
232 SourceRange OpRange,
233 unsigned &msg,
234 CastKind &Kind,
235 CXXCastPath &BasePath);
237 CanQualType DestType, bool CStyle,
238 SourceRange OpRange,
239 QualType OrigSrcType,
240 QualType OrigDestType, unsigned &msg,
241 CastKind &Kind,
242 CXXCastPath &BasePath);
244 QualType SrcType,
245 QualType DestType,bool CStyle,
246 SourceRange OpRange,
247 unsigned &msg,
248 CastKind &Kind,
249 CXXCastPath &BasePath);
250
252 QualType DestType,
254 SourceRange OpRange,
255 unsigned &msg, CastKind &Kind,
256 bool ListInitialization);
258 QualType DestType,
260 SourceRange OpRange,
261 unsigned &msg, CastKind &Kind,
262 CXXCastPath &BasePath,
263 bool ListInitialization);
265 QualType DestType, bool CStyle,
266 unsigned &msg);
268 QualType DestType, bool CStyle,
269 SourceRange OpRange, unsigned &msg,
270 CastKind &Kind);
272 QualType DestType, bool CStyle,
273 unsigned &msg, CastKind &Kind);
274
275/// ActOnCXXNamedCast - Parse
276/// {dynamic,static,reinterpret,const,addrspace}_cast's.
279 SourceLocation LAngleBracketLoc, Declarator &D,
280 SourceLocation RAngleBracketLoc,
281 SourceLocation LParenLoc, Expr *E,
282 SourceLocation RParenLoc) {
283
284 assert(!D.isInvalidType());
285
287 if (D.isInvalidType())
288 return ExprError();
289
290 if (getLangOpts().CPlusPlus) {
291 // Check that there are no default arguments (C++ only).
293 }
294
295 return BuildCXXNamedCast(OpLoc, Kind, TInfo, E,
296 SourceRange(LAngleBracketLoc, RAngleBracketLoc),
297 SourceRange(LParenLoc, RParenLoc));
298}
299
302 TypeSourceInfo *DestTInfo, Expr *E,
303 SourceRange AngleBrackets, SourceRange Parens) {
304 ExprResult Ex = E;
305 QualType DestType = DestTInfo->getType();
306
307 // If the type is dependent, we won't do the semantic analysis now.
308 bool TypeDependent =
309 DestType->isDependentType() || Ex.get()->isTypeDependent();
310
311 CastOperation Op(*this, DestType, E);
312 Op.OpRange = SourceRange(OpLoc, Parens.getEnd());
313 Op.DestRange = AngleBrackets;
314
315 switch (Kind) {
316 default: llvm_unreachable("Unknown C++ cast!");
317
318 case tok::kw_addrspace_cast:
319 if (!TypeDependent) {
320 Op.CheckAddrspaceCast();
321 if (Op.SrcExpr.isInvalid())
322 return ExprError();
323 }
324 return Op.complete(CXXAddrspaceCastExpr::Create(
325 Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
326 DestTInfo, OpLoc, Parens.getEnd(), AngleBrackets));
327
328 case tok::kw_const_cast:
329 if (!TypeDependent) {
330 Op.CheckConstCast();
331 if (Op.SrcExpr.isInvalid())
332 return ExprError();
334 }
335 return Op.complete(CXXConstCastExpr::Create(Context, Op.ResultType,
336 Op.ValueKind, Op.SrcExpr.get(), DestTInfo,
337 OpLoc, Parens.getEnd(),
338 AngleBrackets));
339
340 case tok::kw_dynamic_cast: {
341 // dynamic_cast is not supported in C++ for OpenCL.
342 if (getLangOpts().OpenCLCPlusPlus) {
343 return ExprError(Diag(OpLoc, diag::err_openclcxx_not_supported)
344 << "dynamic_cast");
345 }
346
347 if (!TypeDependent) {
348 Op.CheckDynamicCast();
349 if (Op.SrcExpr.isInvalid())
350 return ExprError();
351 }
352 return Op.complete(CXXDynamicCastExpr::Create(Context, Op.ResultType,
353 Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
354 &Op.BasePath, DestTInfo,
355 OpLoc, Parens.getEnd(),
356 AngleBrackets));
357 }
358 case tok::kw_reinterpret_cast: {
359 if (!TypeDependent) {
360 Op.CheckReinterpretCast();
361 if (Op.SrcExpr.isInvalid())
362 return ExprError();
364 }
365 return Op.complete(CXXReinterpretCastExpr::Create(Context, Op.ResultType,
366 Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
367 nullptr, DestTInfo, OpLoc,
368 Parens.getEnd(),
369 AngleBrackets));
370 }
371 case tok::kw_static_cast: {
372 if (!TypeDependent) {
373 Op.CheckStaticCast();
374 if (Op.SrcExpr.isInvalid())
375 return ExprError();
377 }
378
379 return Op.complete(CXXStaticCastExpr::Create(
380 Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
381 &Op.BasePath, DestTInfo, CurFPFeatureOverrides(), OpLoc,
382 Parens.getEnd(), AngleBrackets));
383 }
384 }
385}
386
388 ExprResult Operand,
389 SourceLocation RParenLoc) {
390 assert(!D.isInvalidType());
391
392 TypeSourceInfo *TInfo = GetTypeForDeclaratorCast(D, Operand.get()->getType());
393 if (D.isInvalidType())
394 return ExprError();
395
396 return BuildBuiltinBitCastExpr(KWLoc, TInfo, Operand.get(), RParenLoc);
397}
398
400 TypeSourceInfo *TSI, Expr *Operand,
401 SourceLocation RParenLoc) {
402 CastOperation Op(*this, TSI->getType(), Operand);
403 Op.OpRange = SourceRange(KWLoc, RParenLoc);
404 TypeLoc TL = TSI->getTypeLoc();
405 Op.DestRange = SourceRange(TL.getBeginLoc(), TL.getEndLoc());
406
407 if (!Operand->isTypeDependent() && !TSI->getType()->isDependentType()) {
408 Op.CheckBuiltinBitCast();
409 if (Op.SrcExpr.isInvalid())
410 return ExprError();
411 }
412
413 BuiltinBitCastExpr *BCE =
414 new (Context) BuiltinBitCastExpr(Op.ResultType, Op.ValueKind, Op.Kind,
415 Op.SrcExpr.get(), TSI, KWLoc, RParenLoc);
416 return Op.complete(BCE);
417}
418
419/// Try to diagnose a failed overloaded cast. Returns true if
420/// diagnostics were emitted.
422 SourceRange range, Expr *src,
423 QualType destType,
424 bool listInitialization) {
425 switch (CT) {
426 // These cast kinds don't consider user-defined conversions.
427 case CT_Const:
428 case CT_Reinterpret:
429 case CT_Dynamic:
430 case CT_Addrspace:
431 return false;
432
433 // These do.
434 case CT_Static:
435 case CT_CStyle:
436 case CT_Functional:
437 break;
438 }
439
440 QualType srcType = src->getType();
441 if (!destType->isRecordType() && !srcType->isRecordType())
442 return false;
443
445 InitializationKind initKind
446 = (CT == CT_CStyle)? InitializationKind::CreateCStyleCast(range.getBegin(),
447 range, listInitialization)
449 listInitialization)
450 : InitializationKind::CreateCast(/*type range?*/ range);
451 InitializationSequence sequence(S, entity, initKind, src);
452
453 assert(sequence.Failed() && "initialization succeeded on second try?");
454 switch (sequence.getFailureKind()) {
455 default: return false;
456
458 // In C++20, if the underlying destination type is a RecordType, Clang
459 // attempts to perform parentesized aggregate initialization if constructor
460 // overload fails:
461 //
462 // C++20 [expr.static.cast]p4:
463 // An expression E can be explicitly converted to a type T...if overload
464 // resolution for a direct-initialization...would find at least one viable
465 // function ([over.match.viable]), or if T is an aggregate type having a
466 // first element X and there is an implicit conversion sequence from E to
467 // the type of X.
468 //
469 // If that fails, then we'll generate the diagnostics from the failed
470 // previous constructor overload attempt. Array initialization, however, is
471 // not done after attempting constructor overloading, so we exit as there
472 // won't be a failed overload result.
473 if (destType->isArrayType())
474 return false;
475 break;
478 break;
479 }
480
481 OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
482
483 unsigned msg = 0;
485
486 switch (sequence.getFailedOverloadResult()) {
487 case OR_Success: llvm_unreachable("successful failed overload");
489 if (candidates.empty())
490 msg = diag::err_ovl_no_conversion_in_cast;
491 else
492 msg = diag::err_ovl_no_viable_conversion_in_cast;
493 howManyCandidates = OCD_AllCandidates;
494 break;
495
496 case OR_Ambiguous:
497 msg = diag::err_ovl_ambiguous_conversion_in_cast;
498 howManyCandidates = OCD_AmbiguousCandidates;
499 break;
500
501 case OR_Deleted:
502 msg = diag::err_ovl_deleted_conversion_in_cast;
503 howManyCandidates = OCD_ViableCandidates;
504 break;
505 }
506
507 candidates.NoteCandidates(
508 PartialDiagnosticAt(range.getBegin(),
509 S.PDiag(msg) << CT << srcType << destType << range
510 << src->getSourceRange()),
511 S, howManyCandidates, src);
512
513 return true;
514}
515
516/// Diagnose a failed cast.
517static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
518 SourceRange opRange, Expr *src, QualType destType,
519 bool listInitialization) {
520 if (msg == diag::err_bad_cxx_cast_generic &&
521 tryDiagnoseOverloadedCast(S, castType, opRange, src, destType,
522 listInitialization))
523 return;
524
525 S.Diag(opRange.getBegin(), msg) << castType
526 << src->getType() << destType << opRange << src->getSourceRange();
527
528 // Detect if both types are (ptr to) class, and note any incompleteness.
529 int DifferentPtrness = 0;
530 QualType From = destType;
531 if (auto Ptr = From->getAs<PointerType>()) {
532 From = Ptr->getPointeeType();
533 DifferentPtrness++;
534 }
535 QualType To = src->getType();
536 if (auto Ptr = To->getAs<PointerType>()) {
537 To = Ptr->getPointeeType();
538 DifferentPtrness--;
539 }
540 if (!DifferentPtrness) {
541 auto RecFrom = From->getAs<RecordType>();
542 auto RecTo = To->getAs<RecordType>();
543 if (RecFrom && RecTo) {
544 auto DeclFrom = RecFrom->getAsCXXRecordDecl();
545 if (!DeclFrom->isCompleteDefinition())
546 S.Diag(DeclFrom->getLocation(), diag::note_type_incomplete) << DeclFrom;
547 auto DeclTo = RecTo->getAsCXXRecordDecl();
548 if (!DeclTo->isCompleteDefinition())
549 S.Diag(DeclTo->getLocation(), diag::note_type_incomplete) << DeclTo;
550 }
551 }
552}
553
554namespace {
555/// The kind of unwrapping we did when determining whether a conversion casts
556/// away constness.
557enum CastAwayConstnessKind {
558 /// The conversion does not cast away constness.
559 CACK_None = 0,
560 /// We unwrapped similar types.
561 CACK_Similar = 1,
562 /// We unwrapped dissimilar types with similar representations (eg, a pointer
563 /// versus an Objective-C object pointer).
564 CACK_SimilarKind = 2,
565 /// We unwrapped representationally-unrelated types, such as a pointer versus
566 /// a pointer-to-member.
567 CACK_Incoherent = 3,
568};
569}
570
571/// Unwrap one level of types for CastsAwayConstness.
572///
573/// Like Sema::UnwrapSimilarTypes, this removes one level of indirection from
574/// both types, provided that they're both pointer-like or array-like. Unlike
575/// the Sema function, doesn't care if the unwrapped pieces are related.
576///
577/// This function may remove additional levels as necessary for correctness:
578/// the resulting T1 is unwrapped sufficiently that it is never an array type,
579/// so that its qualifiers can be directly compared to those of T2 (which will
580/// have the combined set of qualifiers from all indermediate levels of T2),
581/// as (effectively) required by [expr.const.cast]p7 replacing T1's qualifiers
582/// with those from T2.
583static CastAwayConstnessKind
585 enum { None, Ptr, MemPtr, BlockPtr, Array };
586 auto Classify = [](QualType T) {
587 if (T->isAnyPointerType()) return Ptr;
588 if (T->isMemberPointerType()) return MemPtr;
589 if (T->isBlockPointerType()) return BlockPtr;
590 // We somewhat-arbitrarily don't look through VLA types here. This is at
591 // least consistent with the behavior of UnwrapSimilarTypes.
592 if (T->isConstantArrayType() || T->isIncompleteArrayType()) return Array;
593 return None;
594 };
595
596 auto Unwrap = [&](QualType T) {
597 if (auto *AT = Context.getAsArrayType(T))
598 return AT->getElementType();
599 return T->getPointeeType();
600 };
601
602 CastAwayConstnessKind Kind;
603
604 if (T2->isReferenceType()) {
605 // Special case: if the destination type is a reference type, unwrap it as
606 // the first level. (The source will have been an lvalue expression in this
607 // case, so there is no corresponding "reference to" in T1 to remove.) This
608 // simulates removing a "pointer to" from both sides.
609 T2 = T2->getPointeeType();
610 Kind = CastAwayConstnessKind::CACK_Similar;
611 } else if (Context.UnwrapSimilarTypes(T1, T2)) {
612 Kind = CastAwayConstnessKind::CACK_Similar;
613 } else {
614 // Try unwrapping mismatching levels.
615 int T1Class = Classify(T1);
616 if (T1Class == None)
617 return CastAwayConstnessKind::CACK_None;
618
619 int T2Class = Classify(T2);
620 if (T2Class == None)
621 return CastAwayConstnessKind::CACK_None;
622
623 T1 = Unwrap(T1);
624 T2 = Unwrap(T2);
625 Kind = T1Class == T2Class ? CastAwayConstnessKind::CACK_SimilarKind
626 : CastAwayConstnessKind::CACK_Incoherent;
627 }
628
629 // We've unwrapped at least one level. If the resulting T1 is a (possibly
630 // multidimensional) array type, any qualifier on any matching layer of
631 // T2 is considered to correspond to T1. Decompose down to the element
632 // type of T1 so that we can compare properly.
633 while (true) {
634 Context.UnwrapSimilarArrayTypes(T1, T2);
635
636 if (Classify(T1) != Array)
637 break;
638
639 auto T2Class = Classify(T2);
640 if (T2Class == None)
641 break;
642
643 if (T2Class != Array)
644 Kind = CastAwayConstnessKind::CACK_Incoherent;
645 else if (Kind != CastAwayConstnessKind::CACK_Incoherent)
646 Kind = CastAwayConstnessKind::CACK_SimilarKind;
647
648 T1 = Unwrap(T1);
649 T2 = Unwrap(T2).withCVRQualifiers(T2.getCVRQualifiers());
650 }
651
652 return Kind;
653}
654
655/// Check if the pointer conversion from SrcType to DestType casts away
656/// constness as defined in C++ [expr.const.cast]. This is used by the cast
657/// checkers. Both arguments must denote pointer (possibly to member) types.
658///
659/// \param CheckCVR Whether to check for const/volatile/restrict qualifiers.
660/// \param CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.
661static CastAwayConstnessKind
663 bool CheckCVR, bool CheckObjCLifetime,
664 QualType *TheOffendingSrcType = nullptr,
665 QualType *TheOffendingDestType = nullptr,
666 Qualifiers *CastAwayQualifiers = nullptr) {
667 // If the only checking we care about is for Objective-C lifetime qualifiers,
668 // and we're not in ObjC mode, there's nothing to check.
669 if (!CheckCVR && CheckObjCLifetime && !Self.Context.getLangOpts().ObjC)
670 return CastAwayConstnessKind::CACK_None;
671
672 if (!DestType->isReferenceType()) {
673 assert((SrcType->isAnyPointerType() || SrcType->isMemberPointerType() ||
674 SrcType->isBlockPointerType()) &&
675 "Source type is not pointer or pointer to member.");
676 assert((DestType->isAnyPointerType() || DestType->isMemberPointerType() ||
677 DestType->isBlockPointerType()) &&
678 "Destination type is not pointer or pointer to member.");
679 }
680
681 QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
682 UnwrappedDestType = Self.Context.getCanonicalType(DestType);
683
684 // Find the qualifiers. We only care about cvr-qualifiers for the
685 // purpose of this check, because other qualifiers (address spaces,
686 // Objective-C GC, etc.) are part of the type's identity.
687 QualType PrevUnwrappedSrcType = UnwrappedSrcType;
688 QualType PrevUnwrappedDestType = UnwrappedDestType;
689 auto WorstKind = CastAwayConstnessKind::CACK_Similar;
690 bool AllConstSoFar = true;
691 while (auto Kind = unwrapCastAwayConstnessLevel(
692 Self.Context, UnwrappedSrcType, UnwrappedDestType)) {
693 // Track the worst kind of unwrap we needed to do before we found a
694 // problem.
695 if (Kind > WorstKind)
696 WorstKind = Kind;
697
698 // Determine the relevant qualifiers at this level.
699 Qualifiers SrcQuals, DestQuals;
700 Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
701 Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
702
703 // We do not meaningfully track object const-ness of Objective-C object
704 // types. Remove const from the source type if either the source or
705 // the destination is an Objective-C object type.
706 if (UnwrappedSrcType->isObjCObjectType() ||
707 UnwrappedDestType->isObjCObjectType())
708 SrcQuals.removeConst();
709
710 if (CheckCVR) {
711 Qualifiers SrcCvrQuals =
713 Qualifiers DestCvrQuals =
715
716 if (SrcCvrQuals != DestCvrQuals) {
717 if (CastAwayQualifiers)
718 *CastAwayQualifiers = SrcCvrQuals - DestCvrQuals;
719
720 // If we removed a cvr-qualifier, this is casting away 'constness'.
721 if (!DestCvrQuals.compatiblyIncludes(SrcCvrQuals)) {
722 if (TheOffendingSrcType)
723 *TheOffendingSrcType = PrevUnwrappedSrcType;
724 if (TheOffendingDestType)
725 *TheOffendingDestType = PrevUnwrappedDestType;
726 return WorstKind;
727 }
728
729 // If any prior level was not 'const', this is also casting away
730 // 'constness'. We noted the outermost type missing a 'const' already.
731 if (!AllConstSoFar)
732 return WorstKind;
733 }
734 }
735
736 if (CheckObjCLifetime &&
737 !DestQuals.compatiblyIncludesObjCLifetime(SrcQuals))
738 return WorstKind;
739
740 // If we found our first non-const-qualified type, this may be the place
741 // where things start to go wrong.
742 if (AllConstSoFar && !DestQuals.hasConst()) {
743 AllConstSoFar = false;
744 if (TheOffendingSrcType)
745 *TheOffendingSrcType = PrevUnwrappedSrcType;
746 if (TheOffendingDestType)
747 *TheOffendingDestType = PrevUnwrappedDestType;
748 }
749
750 PrevUnwrappedSrcType = UnwrappedSrcType;
751 PrevUnwrappedDestType = UnwrappedDestType;
752 }
753
754 return CastAwayConstnessKind::CACK_None;
755}
756
757static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK,
758 unsigned &DiagID) {
759 switch (CACK) {
760 case CastAwayConstnessKind::CACK_None:
761 llvm_unreachable("did not cast away constness");
762
763 case CastAwayConstnessKind::CACK_Similar:
764 // FIXME: Accept these as an extension too?
765 case CastAwayConstnessKind::CACK_SimilarKind:
766 DiagID = diag::err_bad_cxx_cast_qualifiers_away;
767 return TC_Failed;
768
769 case CastAwayConstnessKind::CACK_Incoherent:
770 DiagID = diag::ext_bad_cxx_cast_qualifiers_away_incoherent;
771 return TC_Extension;
772 }
773
774 llvm_unreachable("unexpected cast away constness kind");
775}
776
777/// CheckDynamicCast - Check that a dynamic_cast<DestType>(SrcExpr) is valid.
778/// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
779/// checked downcasts in class hierarchies.
780void CastOperation::CheckDynamicCast() {
781 CheckNoDerefRAII NoderefCheck(*this);
782
783 if (ValueKind == VK_PRValue)
784 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
785 else if (isPlaceholder())
786 SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
787 if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
788 return;
789
790 QualType OrigSrcType = SrcExpr.get()->getType();
791 QualType DestType = Self.Context.getCanonicalType(this->DestType);
792
793 // C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
794 // or "pointer to cv void".
795
796 QualType DestPointee;
797 const PointerType *DestPointer = DestType->getAs<PointerType>();
798 const ReferenceType *DestReference = nullptr;
799 if (DestPointer) {
800 DestPointee = DestPointer->getPointeeType();
801 } else if ((DestReference = DestType->getAs<ReferenceType>())) {
802 DestPointee = DestReference->getPointeeType();
803 } else {
804 Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
805 << this->DestType << DestRange;
806 SrcExpr = ExprError();
807 return;
808 }
809
810 const RecordType *DestRecord = DestPointee->getAs<RecordType>();
811 if (DestPointee->isVoidType()) {
812 assert(DestPointer && "Reference to void is not possible");
813 } else if (DestRecord) {
814 if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
815 diag::err_bad_cast_incomplete,
816 DestRange)) {
817 SrcExpr = ExprError();
818 return;
819 }
820 } else {
821 Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
822 << DestPointee.getUnqualifiedType() << DestRange;
823 SrcExpr = ExprError();
824 return;
825 }
826
827 // C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
828 // complete class type, [...]. If T is an lvalue reference type, v shall be
829 // an lvalue of a complete class type, [...]. If T is an rvalue reference
830 // type, v shall be an expression having a complete class type, [...]
831 QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
832 QualType SrcPointee;
833 if (DestPointer) {
834 if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
835 SrcPointee = SrcPointer->getPointeeType();
836 } else {
837 Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
838 << OrigSrcType << this->DestType << SrcExpr.get()->getSourceRange();
839 SrcExpr = ExprError();
840 return;
841 }
842 } else if (DestReference->isLValueReferenceType()) {
843 if (!SrcExpr.get()->isLValue()) {
844 Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
845 << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
846 }
847 SrcPointee = SrcType;
848 } else {
849 // If we're dynamic_casting from a prvalue to an rvalue reference, we need
850 // to materialize the prvalue before we bind the reference to it.
851 if (SrcExpr.get()->isPRValue())
852 SrcExpr = Self.CreateMaterializeTemporaryExpr(
853 SrcType, SrcExpr.get(), /*IsLValueReference*/ false);
854 SrcPointee = SrcType;
855 }
856
857 const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
858 if (SrcRecord) {
859 if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
860 diag::err_bad_cast_incomplete,
861 SrcExpr.get())) {
862 SrcExpr = ExprError();
863 return;
864 }
865 } else {
866 Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
867 << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
868 SrcExpr = ExprError();
869 return;
870 }
871
872 assert((DestPointer || DestReference) &&
873 "Bad destination non-ptr/ref slipped through.");
874 assert((DestRecord || DestPointee->isVoidType()) &&
875 "Bad destination pointee slipped through.");
876 assert(SrcRecord && "Bad source pointee slipped through.");
877
878 // C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
879 if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
880 Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_qualifiers_away)
881 << CT_Dynamic << OrigSrcType << this->DestType << OpRange;
882 SrcExpr = ExprError();
883 return;
884 }
885
886 // C++ 5.2.7p3: If the type of v is the same as the required result type,
887 // [except for cv].
888 if (DestRecord == SrcRecord) {
889 Kind = CK_NoOp;
890 return;
891 }
892
893 // C++ 5.2.7p5
894 // Upcasts are resolved statically.
895 if (DestRecord &&
896 Self.IsDerivedFrom(OpRange.getBegin(), SrcPointee, DestPointee)) {
897 if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
898 OpRange.getBegin(), OpRange,
899 &BasePath)) {
900 SrcExpr = ExprError();
901 return;
902 }
903
904 Kind = CK_DerivedToBase;
905 return;
906 }
907
908 // C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
909 const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
910 assert(SrcDecl && "Definition missing");
911 if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
912 Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
913 << SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
914 SrcExpr = ExprError();
915 }
916
917 // dynamic_cast is not available with -fno-rtti.
918 // As an exception, dynamic_cast to void* is available because it doesn't
919 // use RTTI.
920 if (!Self.getLangOpts().RTTI && !DestPointee->isVoidType()) {
921 Self.Diag(OpRange.getBegin(), diag::err_no_dynamic_cast_with_fno_rtti);
922 SrcExpr = ExprError();
923 return;
924 }
925
926 // Warns when dynamic_cast is used with RTTI data disabled.
927 if (!Self.getLangOpts().RTTIData) {
928 bool MicrosoftABI =
929 Self.getASTContext().getTargetInfo().getCXXABI().isMicrosoft();
930 bool isClangCL = Self.getDiagnostics().getDiagnosticOptions().getFormat() ==
932 if (MicrosoftABI || !DestPointee->isVoidType())
933 Self.Diag(OpRange.getBegin(),
934 diag::warn_no_dynamic_cast_with_rtti_disabled)
935 << isClangCL;
936 }
937
938 // For a dynamic_cast to a final type, IR generation might emit a reference
939 // to the vtable.
940 if (DestRecord) {
941 auto *DestDecl = DestRecord->getAsCXXRecordDecl();
942 if (DestDecl->isEffectivelyFinal())
943 Self.MarkVTableUsed(OpRange.getBegin(), DestDecl);
944 }
945
946 // Done. Everything else is run-time checks.
947 Kind = CK_Dynamic;
948}
949
950/// CheckConstCast - Check that a const_cast<DestType>(SrcExpr) is valid.
951/// Refer to C++ 5.2.11 for details. const_cast is typically used in code
952/// like this:
953/// const char *str = "literal";
954/// legacy_function(const_cast<char*>(str));
955void CastOperation::CheckConstCast() {
956 CheckNoDerefRAII NoderefCheck(*this);
957
958 if (ValueKind == VK_PRValue)
959 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
960 else if (isPlaceholder())
961 SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
962 if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
963 return;
964
965 unsigned msg = diag::err_bad_cxx_cast_generic;
966 auto TCR = TryConstCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg);
967 if (TCR != TC_Success && msg != 0) {
968 Self.Diag(OpRange.getBegin(), msg) << CT_Const
969 << SrcExpr.get()->getType() << DestType << OpRange;
970 }
971 if (!isValidCast(TCR))
972 SrcExpr = ExprError();
973}
974
975void CastOperation::CheckAddrspaceCast() {
976 unsigned msg = diag::err_bad_cxx_cast_generic;
977 auto TCR =
978 TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ false, msg, Kind);
979 if (TCR != TC_Success && msg != 0) {
980 Self.Diag(OpRange.getBegin(), msg)
981 << CT_Addrspace << SrcExpr.get()->getType() << DestType << OpRange;
982 }
983 if (!isValidCast(TCR))
984 SrcExpr = ExprError();
985}
986
987/// Check that a reinterpret_cast<DestType>(SrcExpr) is not used as upcast
988/// or downcast between respective pointers or references.
989static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr,
990 QualType DestType,
991 SourceRange OpRange) {
992 QualType SrcType = SrcExpr->getType();
993 // When casting from pointer or reference, get pointee type; use original
994 // type otherwise.
995 const CXXRecordDecl *SrcPointeeRD = SrcType->getPointeeCXXRecordDecl();
996 const CXXRecordDecl *SrcRD =
997 SrcPointeeRD ? SrcPointeeRD : SrcType->getAsCXXRecordDecl();
998
999 // Examining subobjects for records is only possible if the complete and
1000 // valid definition is available. Also, template instantiation is not
1001 // allowed here.
1002 if (!SrcRD || !SrcRD->isCompleteDefinition() || SrcRD->isInvalidDecl())
1003 return;
1004
1005 const CXXRecordDecl *DestRD = DestType->getPointeeCXXRecordDecl();
1006
1007 if (!DestRD || !DestRD->isCompleteDefinition() || DestRD->isInvalidDecl())
1008 return;
1009
1010 enum {
1011 ReinterpretUpcast,
1012 ReinterpretDowncast
1013 } ReinterpretKind;
1014
1015 CXXBasePaths BasePaths;
1016
1017 if (SrcRD->isDerivedFrom(DestRD, BasePaths))
1018 ReinterpretKind = ReinterpretUpcast;
1019 else if (DestRD->isDerivedFrom(SrcRD, BasePaths))
1020 ReinterpretKind = ReinterpretDowncast;
1021 else
1022 return;
1023
1024 bool VirtualBase = true;
1025 bool NonZeroOffset = false;
1026 for (CXXBasePaths::const_paths_iterator I = BasePaths.begin(),
1027 E = BasePaths.end();
1028 I != E; ++I) {
1029 const CXXBasePath &Path = *I;
1030 CharUnits Offset = CharUnits::Zero();
1031 bool IsVirtual = false;
1032 for (CXXBasePath::const_iterator IElem = Path.begin(), EElem = Path.end();
1033 IElem != EElem; ++IElem) {
1034 IsVirtual = IElem->Base->isVirtual();
1035 if (IsVirtual)
1036 break;
1037 const CXXRecordDecl *BaseRD = IElem->Base->getType()->getAsCXXRecordDecl();
1038 assert(BaseRD && "Base type should be a valid unqualified class type");
1039 // Don't check if any base has invalid declaration or has no definition
1040 // since it has no layout info.
1041 const CXXRecordDecl *Class = IElem->Class,
1042 *ClassDefinition = Class->getDefinition();
1043 if (Class->isInvalidDecl() || !ClassDefinition ||
1044 !ClassDefinition->isCompleteDefinition())
1045 return;
1046
1047 const ASTRecordLayout &DerivedLayout =
1048 Self.Context.getASTRecordLayout(Class);
1049 Offset += DerivedLayout.getBaseClassOffset(BaseRD);
1050 }
1051 if (!IsVirtual) {
1052 // Don't warn if any path is a non-virtually derived base at offset zero.
1053 if (Offset.isZero())
1054 return;
1055 // Offset makes sense only for non-virtual bases.
1056 else
1057 NonZeroOffset = true;
1058 }
1059 VirtualBase = VirtualBase && IsVirtual;
1060 }
1061
1062 (void) NonZeroOffset; // Silence set but not used warning.
1063 assert((VirtualBase || NonZeroOffset) &&
1064 "Should have returned if has non-virtual base with zero offset");
1065
1066 QualType BaseType =
1067 ReinterpretKind == ReinterpretUpcast? DestType : SrcType;
1068 QualType DerivedType =
1069 ReinterpretKind == ReinterpretUpcast? SrcType : DestType;
1070
1071 SourceLocation BeginLoc = OpRange.getBegin();
1072 Self.Diag(BeginLoc, diag::warn_reinterpret_different_from_static)
1073 << DerivedType << BaseType << !VirtualBase << int(ReinterpretKind)
1074 << OpRange;
1075 Self.Diag(BeginLoc, diag::note_reinterpret_updowncast_use_static)
1076 << int(ReinterpretKind)
1077 << FixItHint::CreateReplacement(BeginLoc, "static_cast");
1078}
1079
1080static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType,
1081 ASTContext &Context) {
1082 if (SrcType->isPointerType() && DestType->isPointerType())
1083 return true;
1084
1085 // Allow integral type mismatch if their size are equal.
1086 if (SrcType->isIntegralType(Context) && DestType->isIntegralType(Context))
1087 if (Context.getTypeInfoInChars(SrcType).Width ==
1088 Context.getTypeInfoInChars(DestType).Width)
1089 return true;
1090
1091 return Context.hasSameUnqualifiedType(SrcType, DestType);
1092}
1093
1094static unsigned int checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr,
1095 QualType DestType) {
1096 unsigned int DiagID = 0;
1097 const unsigned int DiagList[] = {diag::warn_cast_function_type_strict,
1098 diag::warn_cast_function_type};
1099 for (auto ID : DiagList) {
1100 if (!Self.Diags.isIgnored(ID, SrcExpr.get()->getExprLoc())) {
1101 DiagID = ID;
1102 break;
1103 }
1104 }
1105 if (!DiagID)
1106 return 0;
1107
1108 QualType SrcType = SrcExpr.get()->getType();
1109 const FunctionType *SrcFTy = nullptr;
1110 const FunctionType *DstFTy = nullptr;
1111 if (((SrcType->isBlockPointerType() || SrcType->isFunctionPointerType()) &&
1112 DestType->isFunctionPointerType()) ||
1113 (SrcType->isMemberFunctionPointerType() &&
1114 DestType->isMemberFunctionPointerType())) {
1115 SrcFTy = SrcType->getPointeeType()->castAs<FunctionType>();
1116 DstFTy = DestType->getPointeeType()->castAs<FunctionType>();
1117 } else if (SrcType->isFunctionType() && DestType->isFunctionReferenceType()) {
1118 SrcFTy = SrcType->castAs<FunctionType>();
1119 DstFTy = DestType.getNonReferenceType()->castAs<FunctionType>();
1120 } else {
1121 return 0;
1122 }
1123 assert(SrcFTy && DstFTy);
1124
1125 if (Self.Context.hasSameType(SrcFTy, DstFTy))
1126 return 0;
1127
1128 // For strict checks, ensure we have an exact match.
1129 if (DiagID == diag::warn_cast_function_type_strict)
1130 return DiagID;
1131
1132 auto IsVoidVoid = [](const FunctionType *T) {
1133 if (!T->getReturnType()->isVoidType())
1134 return false;
1135 if (const auto *PT = T->getAs<FunctionProtoType>())
1136 return !PT->isVariadic() && PT->getNumParams() == 0;
1137 return false;
1138 };
1139
1140 // Skip if either function type is void(*)(void)
1141 if (IsVoidVoid(SrcFTy) || IsVoidVoid(DstFTy))
1142 return 0;
1143
1144 // Check return type.
1145 if (!argTypeIsABIEquivalent(SrcFTy->getReturnType(), DstFTy->getReturnType(),
1146 Self.Context))
1147 return DiagID;
1148
1149 // Check if either has unspecified number of parameters
1150 if (SrcFTy->isFunctionNoProtoType() || DstFTy->isFunctionNoProtoType())
1151 return 0;
1152
1153 // Check parameter types.
1154
1155 const auto *SrcFPTy = cast<FunctionProtoType>(SrcFTy);
1156 const auto *DstFPTy = cast<FunctionProtoType>(DstFTy);
1157
1158 // In a cast involving function types with a variable argument list only the
1159 // types of initial arguments that are provided are considered.
1160 unsigned NumParams = SrcFPTy->getNumParams();
1161 unsigned DstNumParams = DstFPTy->getNumParams();
1162 if (NumParams > DstNumParams) {
1163 if (!DstFPTy->isVariadic())
1164 return DiagID;
1165 NumParams = DstNumParams;
1166 } else if (NumParams < DstNumParams) {
1167 if (!SrcFPTy->isVariadic())
1168 return DiagID;
1169 }
1170
1171 for (unsigned i = 0; i < NumParams; ++i)
1172 if (!argTypeIsABIEquivalent(SrcFPTy->getParamType(i),
1173 DstFPTy->getParamType(i), Self.Context))
1174 return DiagID;
1175
1176 return 0;
1177}
1178
1179/// CheckReinterpretCast - Check that a reinterpret_cast<DestType>(SrcExpr) is
1180/// valid.
1181/// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
1182/// like this:
1183/// char *bytes = reinterpret_cast<char*>(int_ptr);
1184void CastOperation::CheckReinterpretCast() {
1185 if (ValueKind == VK_PRValue && !isPlaceholder(BuiltinType::Overload))
1186 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1187 else
1188 checkNonOverloadPlaceholders();
1189 if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1190 return;
1191
1192 unsigned msg = diag::err_bad_cxx_cast_generic;
1193 TryCastResult tcr =
1194 TryReinterpretCast(Self, SrcExpr, DestType,
1195 /*CStyle*/false, OpRange, msg, Kind);
1196 if (tcr != TC_Success && msg != 0) {
1197 if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1198 return;
1199 if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1200 //FIXME: &f<int>; is overloaded and resolvable
1201 Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
1202 << OverloadExpr::find(SrcExpr.get()).Expression->getName()
1203 << DestType << OpRange;
1204 Self.NoteAllOverloadCandidates(SrcExpr.get());
1205
1206 } else {
1207 diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr.get(),
1208 DestType, /*listInitialization=*/false);
1209 }
1210 }
1211
1212 if (isValidCast(tcr)) {
1213 if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1214 checkObjCConversion(Sema::CCK_OtherCast);
1215 DiagnoseReinterpretUpDownCast(Self, SrcExpr.get(), DestType, OpRange);
1216
1217 if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
1218 Self.Diag(OpRange.getBegin(), DiagID)
1219 << SrcExpr.get()->getType() << DestType << OpRange;
1220 } else {
1221 SrcExpr = ExprError();
1222 }
1223}
1224
1225
1226/// CheckStaticCast - Check that a static_cast<DestType>(SrcExpr) is valid.
1227/// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
1228/// implicit conversions explicit and getting rid of data loss warnings.
1229void CastOperation::CheckStaticCast() {
1230 CheckNoDerefRAII NoderefCheck(*this);
1231
1232 if (isPlaceholder()) {
1233 checkNonOverloadPlaceholders();
1234 if (SrcExpr.isInvalid())
1235 return;
1236 }
1237
1238 // This test is outside everything else because it's the only case where
1239 // a non-lvalue-reference target type does not lead to decay.
1240 // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1241 if (DestType->isVoidType()) {
1242 Kind = CK_ToVoid;
1243
1244 if (claimPlaceholder(BuiltinType::Overload)) {
1245 Self.ResolveAndFixSingleFunctionTemplateSpecialization(SrcExpr,
1246 false, // Decay Function to ptr
1247 true, // Complain
1248 OpRange, DestType, diag::err_bad_static_cast_overload);
1249 if (SrcExpr.isInvalid())
1250 return;
1251 }
1252
1253 SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
1254 return;
1255 }
1256
1257 if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
1258 !isPlaceholder(BuiltinType::Overload)) {
1259 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1260 if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1261 return;
1262 }
1263
1264 unsigned msg = diag::err_bad_cxx_cast_generic;
1265 TryCastResult tcr
1266 = TryStaticCast(Self, SrcExpr, DestType, Sema::CCK_OtherCast, OpRange, msg,
1267 Kind, BasePath, /*ListInitialization=*/false);
1268 if (tcr != TC_Success && msg != 0) {
1269 if (SrcExpr.isInvalid())
1270 return;
1271 if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1272 OverloadExpr* oe = OverloadExpr::find(SrcExpr.get()).Expression;
1273 Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
1274 << oe->getName() << DestType << OpRange
1276 Self.NoteAllOverloadCandidates(SrcExpr.get());
1277 } else {
1278 diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr.get(), DestType,
1279 /*listInitialization=*/false);
1280 }
1281 }
1282
1283 if (isValidCast(tcr)) {
1284 if (Kind == CK_BitCast)
1285 checkCastAlign();
1286 if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1287 checkObjCConversion(Sema::CCK_OtherCast);
1288 } else {
1289 SrcExpr = ExprError();
1290 }
1291}
1292
1293static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType) {
1294 auto *SrcPtrType = SrcType->getAs<PointerType>();
1295 if (!SrcPtrType)
1296 return false;
1297 auto *DestPtrType = DestType->getAs<PointerType>();
1298 if (!DestPtrType)
1299 return false;
1300 return SrcPtrType->getPointeeType().getAddressSpace() !=
1301 DestPtrType->getPointeeType().getAddressSpace();
1302}
1303
1304/// TryStaticCast - Check if a static cast can be performed, and do so if
1305/// possible. If @p CStyle, ignore access restrictions on hierarchy casting
1306/// and casting away constness.
1308 QualType DestType,
1310 SourceRange OpRange, unsigned &msg,
1311 CastKind &Kind, CXXCastPath &BasePath,
1312 bool ListInitialization) {
1313 // Determine whether we have the semantics of a C-style cast.
1314 bool CStyle
1316
1317 // The order the tests is not entirely arbitrary. There is one conversion
1318 // that can be handled in two different ways. Given:
1319 // struct A {};
1320 // struct B : public A {
1321 // B(); B(const A&);
1322 // };
1323 // const A &a = B();
1324 // the cast static_cast<const B&>(a) could be seen as either a static
1325 // reference downcast, or an explicit invocation of the user-defined
1326 // conversion using B's conversion constructor.
1327 // DR 427 specifies that the downcast is to be applied here.
1328
1329 // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1330 // Done outside this function.
1331
1332 TryCastResult tcr;
1333
1334 // C++ 5.2.9p5, reference downcast.
1335 // See the function for details.
1336 // DR 427 specifies that this is to be applied before paragraph 2.
1337 tcr = TryStaticReferenceDowncast(Self, SrcExpr.get(), DestType, CStyle,
1338 OpRange, msg, Kind, BasePath);
1339 if (tcr != TC_NotApplicable)
1340 return tcr;
1341
1342 // C++11 [expr.static.cast]p3:
1343 // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
1344 // T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1345 tcr = TryLValueToRValueCast(Self, SrcExpr.get(), DestType, CStyle, Kind,
1346 BasePath, msg);
1347 if (tcr != TC_NotApplicable)
1348 return tcr;
1349
1350 // C++ 5.2.9p2: An expression e can be explicitly converted to a type T
1351 // [...] if the declaration "T t(e);" is well-formed, [...].
1352 tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CCK, OpRange, msg,
1353 Kind, ListInitialization);
1354 if (SrcExpr.isInvalid())
1355 return TC_Failed;
1356 if (tcr != TC_NotApplicable)
1357 return tcr;
1358
1359 // C++ 5.2.9p6: May apply the reverse of any standard conversion, except
1360 // lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
1361 // conversions, subject to further restrictions.
1362 // Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
1363 // of qualification conversions impossible. (In C++20, adding an array bound
1364 // would be the reverse of a qualification conversion, but adding permission
1365 // to add an array bound in a static_cast is a wording oversight.)
1366 // In the CStyle case, the earlier attempt to const_cast should have taken
1367 // care of reverse qualification conversions.
1368
1369 QualType SrcType = Self.Context.getCanonicalType(SrcExpr.get()->getType());
1370
1371 // C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
1372 // converted to an integral type. [...] A value of a scoped enumeration type
1373 // can also be explicitly converted to a floating-point type [...].
1374 if (const EnumType *Enum = SrcType->getAs<EnumType>()) {
1375 if (Enum->getDecl()->isScoped()) {
1376 if (DestType->isBooleanType()) {
1377 Kind = CK_IntegralToBoolean;
1378 return TC_Success;
1379 } else if (DestType->isIntegralType(Self.Context)) {
1380 Kind = CK_IntegralCast;
1381 return TC_Success;
1382 } else if (DestType->isRealFloatingType()) {
1383 Kind = CK_IntegralToFloating;
1384 return TC_Success;
1385 }
1386 }
1387 }
1388
1389 // Reverse integral promotion/conversion. All such conversions are themselves
1390 // again integral promotions or conversions and are thus already handled by
1391 // p2 (TryDirectInitialization above).
1392 // (Note: any data loss warnings should be suppressed.)
1393 // The exception is the reverse of enum->integer, i.e. integer->enum (and
1394 // enum->enum). See also C++ 5.2.9p7.
1395 // The same goes for reverse floating point promotion/conversion and
1396 // floating-integral conversions. Again, only floating->enum is relevant.
1397 if (DestType->isEnumeralType()) {
1398 if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1399 diag::err_bad_cast_incomplete)) {
1400 SrcExpr = ExprError();
1401 return TC_Failed;
1402 }
1403 if (SrcType->isIntegralOrEnumerationType()) {
1404 // [expr.static.cast]p10 If the enumeration type has a fixed underlying
1405 // type, the value is first converted to that type by integral conversion
1406 const EnumType *Enum = DestType->castAs<EnumType>();
1407 Kind = Enum->getDecl()->isFixed() &&
1408 Enum->getDecl()->getIntegerType()->isBooleanType()
1409 ? CK_IntegralToBoolean
1410 : CK_IntegralCast;
1411 return TC_Success;
1412 } else if (SrcType->isRealFloatingType()) {
1413 Kind = CK_FloatingToIntegral;
1414 return TC_Success;
1415 }
1416 }
1417
1418 // Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
1419 // C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
1420 tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
1421 Kind, BasePath);
1422 if (tcr != TC_NotApplicable)
1423 return tcr;
1424
1425 // Reverse member pointer conversion. C++ 4.11 specifies member pointer
1426 // conversion. C++ 5.2.9p9 has additional information.
1427 // DR54's access restrictions apply here also.
1428 tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
1429 OpRange, msg, Kind, BasePath);
1430 if (tcr != TC_NotApplicable)
1431 return tcr;
1432
1433 // Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
1434 // void*. C++ 5.2.9p10 specifies additional restrictions, which really is
1435 // just the usual constness stuff.
1436 if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
1437 QualType SrcPointee = SrcPointer->getPointeeType();
1438 if (SrcPointee->isVoidType()) {
1439 if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
1440 QualType DestPointee = DestPointer->getPointeeType();
1441 if (DestPointee->isIncompleteOrObjectType()) {
1442 // This is definitely the intended conversion, but it might fail due
1443 // to a qualifier violation. Note that we permit Objective-C lifetime
1444 // and GC qualifier mismatches here.
1445 if (!CStyle) {
1446 Qualifiers DestPointeeQuals = DestPointee.getQualifiers();
1447 Qualifiers SrcPointeeQuals = SrcPointee.getQualifiers();
1448 DestPointeeQuals.removeObjCGCAttr();
1449 DestPointeeQuals.removeObjCLifetime();
1450 SrcPointeeQuals.removeObjCGCAttr();
1451 SrcPointeeQuals.removeObjCLifetime();
1452 if (DestPointeeQuals != SrcPointeeQuals &&
1453 !DestPointeeQuals.compatiblyIncludes(SrcPointeeQuals)) {
1454 msg = diag::err_bad_cxx_cast_qualifiers_away;
1455 return TC_Failed;
1456 }
1457 }
1458 Kind = IsAddressSpaceConversion(SrcType, DestType)
1459 ? CK_AddressSpaceConversion
1460 : CK_BitCast;
1461 return TC_Success;
1462 }
1463
1464 // Microsoft permits static_cast from 'pointer-to-void' to
1465 // 'pointer-to-function'.
1466 if (!CStyle && Self.getLangOpts().MSVCCompat &&
1467 DestPointee->isFunctionType()) {
1468 Self.Diag(OpRange.getBegin(), diag::ext_ms_cast_fn_obj) << OpRange;
1469 Kind = CK_BitCast;
1470 return TC_Success;
1471 }
1472 }
1473 else if (DestType->isObjCObjectPointerType()) {
1474 // allow both c-style cast and static_cast of objective-c pointers as
1475 // they are pervasive.
1476 Kind = CK_CPointerToObjCPointerCast;
1477 return TC_Success;
1478 }
1479 else if (CStyle && DestType->isBlockPointerType()) {
1480 // allow c-style cast of void * to block pointers.
1481 Kind = CK_AnyPointerToBlockPointerCast;
1482 return TC_Success;
1483 }
1484 }
1485 }
1486 // Allow arbitrary objective-c pointer conversion with static casts.
1487 if (SrcType->isObjCObjectPointerType() &&
1488 DestType->isObjCObjectPointerType()) {
1489 Kind = CK_BitCast;
1490 return TC_Success;
1491 }
1492 // Allow ns-pointer to cf-pointer conversion in either direction
1493 // with static casts.
1494 if (!CStyle &&
1495 Self.CheckTollFreeBridgeStaticCast(DestType, SrcExpr.get(), Kind))
1496 return TC_Success;
1497
1498 // See if it looks like the user is trying to convert between
1499 // related record types, and select a better diagnostic if so.
1500 if (auto SrcPointer = SrcType->getAs<PointerType>())
1501 if (auto DestPointer = DestType->getAs<PointerType>())
1502 if (SrcPointer->getPointeeType()->getAs<RecordType>() &&
1503 DestPointer->getPointeeType()->getAs<RecordType>())
1504 msg = diag::err_bad_cxx_cast_unrelated_class;
1505
1506 if (SrcType->isMatrixType() && DestType->isMatrixType()) {
1507 if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind)) {
1508 SrcExpr = ExprError();
1509 return TC_Failed;
1510 }
1511 return TC_Success;
1512 }
1513
1514 // We tried everything. Everything! Nothing works! :-(
1515 return TC_NotApplicable;
1516}
1517
1518/// Tests whether a conversion according to N2844 is valid.
1520 QualType DestType, bool CStyle,
1521 CastKind &Kind, CXXCastPath &BasePath,
1522 unsigned &msg) {
1523 // C++11 [expr.static.cast]p3:
1524 // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
1525 // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1526 const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
1527 if (!R)
1528 return TC_NotApplicable;
1529
1530 if (!SrcExpr->isGLValue())
1531 return TC_NotApplicable;
1532
1533 // Because we try the reference downcast before this function, from now on
1534 // this is the only cast possibility, so we issue an error if we fail now.
1535 // FIXME: Should allow casting away constness if CStyle.
1536 QualType FromType = SrcExpr->getType();
1537 QualType ToType = R->getPointeeType();
1538 if (CStyle) {
1539 FromType = FromType.getUnqualifiedType();
1540 ToType = ToType.getUnqualifiedType();
1541 }
1542
1544 Sema::ReferenceCompareResult RefResult = Self.CompareReferenceRelationship(
1545 SrcExpr->getBeginLoc(), ToType, FromType, &RefConv);
1546 if (RefResult != Sema::Ref_Compatible) {
1547 if (CStyle || RefResult == Sema::Ref_Incompatible)
1548 return TC_NotApplicable;
1549 // Diagnose types which are reference-related but not compatible here since
1550 // we can provide better diagnostics. In these cases forwarding to
1551 // [expr.static.cast]p4 should never result in a well-formed cast.
1552 msg = SrcExpr->isLValue() ? diag::err_bad_lvalue_to_rvalue_cast
1553 : diag::err_bad_rvalue_to_rvalue_cast;
1554 return TC_Failed;
1555 }
1556
1557 if (RefConv & Sema::ReferenceConversions::DerivedToBase) {
1558 Kind = CK_DerivedToBase;
1559 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1560 /*DetectVirtual=*/true);
1561 if (!Self.IsDerivedFrom(SrcExpr->getBeginLoc(), SrcExpr->getType(),
1562 R->getPointeeType(), Paths))
1563 return TC_NotApplicable;
1564
1565 Self.BuildBasePathArray(Paths, BasePath);
1566 } else
1567 Kind = CK_NoOp;
1568
1569 return TC_Success;
1570}
1571
1572/// Tests whether a conversion according to C++ 5.2.9p5 is valid.
1575 bool CStyle, SourceRange OpRange,
1576 unsigned &msg, CastKind &Kind,
1577 CXXCastPath &BasePath) {
1578 // C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
1579 // cast to type "reference to cv2 D", where D is a class derived from B,
1580 // if a valid standard conversion from "pointer to D" to "pointer to B"
1581 // exists, cv2 >= cv1, and B is not a virtual base class of D.
1582 // In addition, DR54 clarifies that the base must be accessible in the
1583 // current context. Although the wording of DR54 only applies to the pointer
1584 // variant of this rule, the intent is clearly for it to apply to the this
1585 // conversion as well.
1586
1587 const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
1588 if (!DestReference) {
1589 return TC_NotApplicable;
1590 }
1591 bool RValueRef = DestReference->isRValueReferenceType();
1592 if (!RValueRef && !SrcExpr->isLValue()) {
1593 // We know the left side is an lvalue reference, so we can suggest a reason.
1594 msg = diag::err_bad_cxx_cast_rvalue;
1595 return TC_NotApplicable;
1596 }
1597
1598 QualType DestPointee = DestReference->getPointeeType();
1599
1600 // FIXME: If the source is a prvalue, we should issue a warning (because the
1601 // cast always has undefined behavior), and for AST consistency, we should
1602 // materialize a temporary.
1603 return TryStaticDowncast(Self,
1604 Self.Context.getCanonicalType(SrcExpr->getType()),
1605 Self.Context.getCanonicalType(DestPointee), CStyle,
1606 OpRange, SrcExpr->getType(), DestType, msg, Kind,
1607 BasePath);
1608}
1609
1610/// Tests whether a conversion according to C++ 5.2.9p8 is valid.
1613 bool CStyle, SourceRange OpRange,
1614 unsigned &msg, CastKind &Kind,
1615 CXXCastPath &BasePath) {
1616 // C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
1617 // type, can be converted to an rvalue of type "pointer to cv2 D", where D
1618 // is a class derived from B, if a valid standard conversion from "pointer
1619 // to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
1620 // class of D.
1621 // In addition, DR54 clarifies that the base must be accessible in the
1622 // current context.
1623
1624 const PointerType *DestPointer = DestType->getAs<PointerType>();
1625 if (!DestPointer) {
1626 return TC_NotApplicable;
1627 }
1628
1629 const PointerType *SrcPointer = SrcType->getAs<PointerType>();
1630 if (!SrcPointer) {
1631 msg = diag::err_bad_static_cast_pointer_nonpointer;
1632 return TC_NotApplicable;
1633 }
1634
1635 return TryStaticDowncast(Self,
1636 Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
1637 Self.Context.getCanonicalType(DestPointer->getPointeeType()),
1638 CStyle, OpRange, SrcType, DestType, msg, Kind,
1639 BasePath);
1640}
1641
1642/// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
1643/// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
1644/// DestType is possible and allowed.
1647 bool CStyle, SourceRange OpRange, QualType OrigSrcType,
1648 QualType OrigDestType, unsigned &msg,
1649 CastKind &Kind, CXXCastPath &BasePath) {
1650 // We can only work with complete types. But don't complain if it doesn't work
1651 if (!Self.isCompleteType(OpRange.getBegin(), SrcType) ||
1652 !Self.isCompleteType(OpRange.getBegin(), DestType))
1653 return TC_NotApplicable;
1654
1655 // Downcast can only happen in class hierarchies, so we need classes.
1656 if (!DestType->getAs<RecordType>() || !SrcType->getAs<RecordType>()) {
1657 return TC_NotApplicable;
1658 }
1659
1660 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1661 /*DetectVirtual=*/true);
1662 if (!Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths)) {
1663 return TC_NotApplicable;
1664 }
1665
1666 // Target type does derive from source type. Now we're serious. If an error
1667 // appears now, it's not ignored.
1668 // This may not be entirely in line with the standard. Take for example:
1669 // struct A {};
1670 // struct B : virtual A {
1671 // B(A&);
1672 // };
1673 //
1674 // void f()
1675 // {
1676 // (void)static_cast<const B&>(*((A*)0));
1677 // }
1678 // As far as the standard is concerned, p5 does not apply (A is virtual), so
1679 // p2 should be used instead - "const B& t(*((A*)0));" is perfectly valid.
1680 // However, both GCC and Comeau reject this example, and accepting it would
1681 // mean more complex code if we're to preserve the nice error message.
1682 // FIXME: Being 100% compliant here would be nice to have.
1683
1684 // Must preserve cv, as always, unless we're in C-style mode.
1685 if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
1686 msg = diag::err_bad_cxx_cast_qualifiers_away;
1687 return TC_Failed;
1688 }
1689
1690 if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
1691 // This code is analoguous to that in CheckDerivedToBaseConversion, except
1692 // that it builds the paths in reverse order.
1693 // To sum up: record all paths to the base and build a nice string from
1694 // them. Use it to spice up the error message.
1695 if (!Paths.isRecordingPaths()) {
1696 Paths.clear();
1697 Paths.setRecordingPaths(true);
1698 Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths);
1699 }
1700 std::string PathDisplayStr;
1701 std::set<unsigned> DisplayedPaths;
1702 for (clang::CXXBasePath &Path : Paths) {
1703 if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
1704 // We haven't displayed a path to this particular base
1705 // class subobject yet.
1706 PathDisplayStr += "\n ";
1707 for (CXXBasePathElement &PE : llvm::reverse(Path))
1708 PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
1709 PathDisplayStr += QualType(DestType).getAsString();
1710 }
1711 }
1712
1713 Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
1714 << QualType(SrcType).getUnqualifiedType()
1715 << QualType(DestType).getUnqualifiedType()
1716 << PathDisplayStr << OpRange;
1717 msg = 0;
1718 return TC_Failed;
1719 }
1720
1721 if (Paths.getDetectedVirtual() != nullptr) {
1722 QualType VirtualBase(Paths.getDetectedVirtual(), 0);
1723 Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
1724 << OrigSrcType << OrigDestType << VirtualBase << OpRange;
1725 msg = 0;
1726 return TC_Failed;
1727 }
1728
1729 if (!CStyle) {
1730 switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1731 SrcType, DestType,
1732 Paths.front(),
1733 diag::err_downcast_from_inaccessible_base)) {
1735 case Sema::AR_delayed: // be optimistic
1736 case Sema::AR_dependent: // be optimistic
1737 break;
1738
1740 msg = 0;
1741 return TC_Failed;
1742 }
1743 }
1744
1745 Self.BuildBasePathArray(Paths, BasePath);
1746 Kind = CK_BaseToDerived;
1747 return TC_Success;
1748}
1749
1750/// TryStaticMemberPointerUpcast - Tests whether a conversion according to
1751/// C++ 5.2.9p9 is valid:
1752///
1753/// An rvalue of type "pointer to member of D of type cv1 T" can be
1754/// converted to an rvalue of type "pointer to member of B of type cv2 T",
1755/// where B is a base class of D [...].
1756///
1759 QualType DestType, bool CStyle,
1760 SourceRange OpRange,
1761 unsigned &msg, CastKind &Kind,
1762 CXXCastPath &BasePath) {
1763 const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
1764 if (!DestMemPtr)
1765 return TC_NotApplicable;
1766
1767 bool WasOverloadedFunction = false;
1768 DeclAccessPair FoundOverload;
1769 if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1770 if (FunctionDecl *Fn
1771 = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(), DestType, false,
1772 FoundOverload)) {
1773 CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
1774 SrcType = Self.Context.getMemberPointerType(Fn->getType(),
1775 Self.Context.getTypeDeclType(M->getParent()).getTypePtr());
1776 WasOverloadedFunction = true;
1777 }
1778 }
1779
1780 const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1781 if (!SrcMemPtr) {
1782 msg = diag::err_bad_static_cast_member_pointer_nonmp;
1783 return TC_NotApplicable;
1784 }
1785
1786 // Lock down the inheritance model right now in MS ABI, whether or not the
1787 // pointee types are the same.
1788 if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1789 (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
1790 (void)Self.isCompleteType(OpRange.getBegin(), DestType);
1791 }
1792
1793 // T == T, modulo cv
1794 if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
1795 DestMemPtr->getPointeeType()))
1796 return TC_NotApplicable;
1797
1798 // B base of D
1799 QualType SrcClass(SrcMemPtr->getClass(), 0);
1800 QualType DestClass(DestMemPtr->getClass(), 0);
1801 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
1802 /*DetectVirtual=*/true);
1803 if (!Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths))
1804 return TC_NotApplicable;
1805
1806 // B is a base of D. But is it an allowed base? If not, it's a hard error.
1807 if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
1808 Paths.clear();
1809 Paths.setRecordingPaths(true);
1810 bool StillOkay =
1811 Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths);
1812 assert(StillOkay);
1813 (void)StillOkay;
1814 std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
1815 Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
1816 << 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
1817 msg = 0;
1818 return TC_Failed;
1819 }
1820
1821 if (const RecordType *VBase = Paths.getDetectedVirtual()) {
1822 Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
1823 << SrcClass << DestClass << QualType(VBase, 0) << OpRange;
1824 msg = 0;
1825 return TC_Failed;
1826 }
1827
1828 if (!CStyle) {
1829 switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1830 DestClass, SrcClass,
1831 Paths.front(),
1832 diag::err_upcast_to_inaccessible_base)) {
1834 case Sema::AR_delayed:
1835 case Sema::AR_dependent:
1836 // Optimistically assume that the delayed and dependent cases
1837 // will work out.
1838 break;
1839
1841 msg = 0;
1842 return TC_Failed;
1843 }
1844 }
1845
1846 if (WasOverloadedFunction) {
1847 // Resolve the address of the overloaded function again, this time
1848 // allowing complaints if something goes wrong.
1849 FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
1850 DestType,
1851 true,
1852 FoundOverload);
1853 if (!Fn) {
1854 msg = 0;
1855 return TC_Failed;
1856 }
1857
1858 SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
1859 if (!SrcExpr.isUsable()) {
1860 msg = 0;
1861 return TC_Failed;
1862 }
1863 }
1864
1865 Self.BuildBasePathArray(Paths, BasePath);
1866 Kind = CK_DerivedToBaseMemberPointer;
1867 return TC_Success;
1868}
1869
1870/// TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2
1871/// is valid:
1872///
1873/// An expression e can be explicitly converted to a type T using a
1874/// @c static_cast if the declaration "T t(e);" is well-formed [...].
1878 SourceRange OpRange, unsigned &msg,
1879 CastKind &Kind, bool ListInitialization) {
1880 if (DestType->isRecordType()) {
1881 if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1882 diag::err_bad_cast_incomplete) ||
1883 Self.RequireNonAbstractType(OpRange.getBegin(), DestType,
1884 diag::err_allocation_of_abstract_type)) {
1885 msg = 0;
1886 return TC_Failed;
1887 }
1888 }
1889
1891 InitializationKind InitKind
1892 = (CCK == Sema::CCK_CStyleCast)
1894 ListInitialization)
1895 : (CCK == Sema::CCK_FunctionalCast)
1896 ? InitializationKind::CreateFunctionalCast(OpRange, ListInitialization)
1898 Expr *SrcExprRaw = SrcExpr.get();
1899 // FIXME: Per DR242, we should check for an implicit conversion sequence
1900 // or for a constructor that could be invoked by direct-initialization
1901 // here, not for an initialization sequence.
1902 InitializationSequence InitSeq(Self, Entity, InitKind, SrcExprRaw);
1903
1904 // At this point of CheckStaticCast, if the destination is a reference,
1905 // or the expression is an overload expression this has to work.
1906 // There is no other way that works.
1907 // On the other hand, if we're checking a C-style cast, we've still got
1908 // the reinterpret_cast way.
1909 bool CStyle
1911 if (InitSeq.Failed() && (CStyle || !DestType->isReferenceType()))
1912 return TC_NotApplicable;
1913
1914 ExprResult Result = InitSeq.Perform(Self, Entity, InitKind, SrcExprRaw);
1915 if (Result.isInvalid()) {
1916 msg = 0;
1917 return TC_Failed;
1918 }
1919
1920 if (InitSeq.isConstructorInitialization())
1921 Kind = CK_ConstructorConversion;
1922 else
1923 Kind = CK_NoOp;
1924
1925 SrcExpr = Result;
1926 return TC_Success;
1927}
1928
1929/// TryConstCast - See if a const_cast from source to destination is allowed,
1930/// and perform it if it is.
1932 QualType DestType, bool CStyle,
1933 unsigned &msg) {
1934 DestType = Self.Context.getCanonicalType(DestType);
1935 QualType SrcType = SrcExpr.get()->getType();
1936 bool NeedToMaterializeTemporary = false;
1937
1938 if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
1939 // C++11 5.2.11p4:
1940 // if a pointer to T1 can be explicitly converted to the type "pointer to
1941 // T2" using a const_cast, then the following conversions can also be
1942 // made:
1943 // -- an lvalue of type T1 can be explicitly converted to an lvalue of
1944 // type T2 using the cast const_cast<T2&>;
1945 // -- a glvalue of type T1 can be explicitly converted to an xvalue of
1946 // type T2 using the cast const_cast<T2&&>; and
1947 // -- if T1 is a class type, a prvalue of type T1 can be explicitly
1948 // converted to an xvalue of type T2 using the cast const_cast<T2&&>.
1949
1950 if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr.get()->isLValue()) {
1951 // Cannot const_cast non-lvalue to lvalue reference type. But if this
1952 // is C-style, static_cast might find a way, so we simply suggest a
1953 // message and tell the parent to keep searching.
1954 msg = diag::err_bad_cxx_cast_rvalue;
1955 return TC_NotApplicable;
1956 }
1957
1958 if (isa<RValueReferenceType>(DestTypeTmp) && SrcExpr.get()->isPRValue()) {
1959 if (!SrcType->isRecordType()) {
1960 // Cannot const_cast non-class prvalue to rvalue reference type. But if
1961 // this is C-style, static_cast can do this.
1962 msg = diag::err_bad_cxx_cast_rvalue;
1963 return TC_NotApplicable;
1964 }
1965
1966 // Materialize the class prvalue so that the const_cast can bind a
1967 // reference to it.
1968 NeedToMaterializeTemporary = true;
1969 }
1970
1971 // It's not completely clear under the standard whether we can
1972 // const_cast bit-field gl-values. Doing so would not be
1973 // intrinsically complicated, but for now, we say no for
1974 // consistency with other compilers and await the word of the
1975 // committee.
1976 if (SrcExpr.get()->refersToBitField()) {
1977 msg = diag::err_bad_cxx_cast_bitfield;
1978 return TC_NotApplicable;
1979 }
1980
1981 DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1982 SrcType = Self.Context.getPointerType(SrcType);
1983 }
1984
1985 // C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
1986 // the rules for const_cast are the same as those used for pointers.
1987
1988 if (!DestType->isPointerType() &&
1989 !DestType->isMemberPointerType() &&
1990 !DestType->isObjCObjectPointerType()) {
1991 // Cannot cast to non-pointer, non-reference type. Note that, if DestType
1992 // was a reference type, we converted it to a pointer above.
1993 // The status of rvalue references isn't entirely clear, but it looks like
1994 // conversion to them is simply invalid.
1995 // C++ 5.2.11p3: For two pointer types [...]
1996 if (!CStyle)
1997 msg = diag::err_bad_const_cast_dest;
1998 return TC_NotApplicable;
1999 }
2000 if (DestType->isFunctionPointerType() ||
2001 DestType->isMemberFunctionPointerType()) {
2002 // Cannot cast direct function pointers.
2003 // C++ 5.2.11p2: [...] where T is any object type or the void type [...]
2004 // T is the ultimate pointee of source and target type.
2005 if (!CStyle)
2006 msg = diag::err_bad_const_cast_dest;
2007 return TC_NotApplicable;
2008 }
2009
2010 // C++ [expr.const.cast]p3:
2011 // "For two similar types T1 and T2, [...]"
2012 //
2013 // We only allow a const_cast to change cvr-qualifiers, not other kinds of
2014 // type qualifiers. (Likewise, we ignore other changes when determining
2015 // whether a cast casts away constness.)
2016 if (!Self.Context.hasCvrSimilarType(SrcType, DestType))
2017 return TC_NotApplicable;
2018
2019 if (NeedToMaterializeTemporary)
2020 // This is a const_cast from a class prvalue to an rvalue reference type.
2021 // Materialize a temporary to store the result of the conversion.
2022 SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcExpr.get()->getType(),
2023 SrcExpr.get(),
2024 /*IsLValueReference*/ false);
2025
2026 return TC_Success;
2027}
2028
2029// Checks for undefined behavior in reinterpret_cast.
2030// The cases that is checked for is:
2031// *reinterpret_cast<T*>(&a)
2032// reinterpret_cast<T&>(a)
2033// where accessing 'a' as type 'T' will result in undefined behavior.
2035 bool IsDereference,
2036 SourceRange Range) {
2037 unsigned DiagID = IsDereference ?
2038 diag::warn_pointer_indirection_from_incompatible_type :
2039 diag::warn_undefined_reinterpret_cast;
2040
2041 if (Diags.isIgnored(DiagID, Range.getBegin()))
2042 return;
2043
2044 QualType SrcTy, DestTy;
2045 if (IsDereference) {
2046 if (!SrcType->getAs<PointerType>() || !DestType->getAs<PointerType>()) {
2047 return;
2048 }
2049 SrcTy = SrcType->getPointeeType();
2050 DestTy = DestType->getPointeeType();
2051 } else {
2052 if (!DestType->getAs<ReferenceType>()) {
2053 return;
2054 }
2055 SrcTy = SrcType;
2056 DestTy = DestType->getPointeeType();
2057 }
2058
2059 // Cast is compatible if the types are the same.
2060 if (Context.hasSameUnqualifiedType(DestTy, SrcTy)) {
2061 return;
2062 }
2063 // or one of the types is a char or void type
2064 if (DestTy->isAnyCharacterType() || DestTy->isVoidType() ||
2065 SrcTy->isAnyCharacterType() || SrcTy->isVoidType()) {
2066 return;
2067 }
2068 // or one of the types is a tag type.
2069 if (SrcTy->getAs<TagType>() || DestTy->getAs<TagType>()) {
2070 return;
2071 }
2072
2073 // FIXME: Scoped enums?
2074 if ((SrcTy->isUnsignedIntegerType() && DestTy->isSignedIntegerType()) ||
2075 (SrcTy->isSignedIntegerType() && DestTy->isUnsignedIntegerType())) {
2076 if (Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) {
2077 return;
2078 }
2079 }
2080
2081 Diag(Range.getBegin(), DiagID) << SrcType << DestType << Range;
2082}
2083
2084static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr,
2085 QualType DestType) {
2086 QualType SrcType = SrcExpr.get()->getType();
2087 if (Self.Context.hasSameType(SrcType, DestType))
2088 return;
2089 if (const PointerType *SrcPtrTy = SrcType->getAs<PointerType>())
2090 if (SrcPtrTy->isObjCSelType()) {
2091 QualType DT = DestType;
2092 if (isa<PointerType>(DestType))
2093 DT = DestType->getPointeeType();
2094 if (!DT.getUnqualifiedType()->isVoidType())
2095 Self.Diag(SrcExpr.get()->getExprLoc(),
2096 diag::warn_cast_pointer_from_sel)
2097 << SrcType << DestType << SrcExpr.get()->getSourceRange();
2098 }
2099}
2100
2101/// Diagnose casts that change the calling convention of a pointer to a function
2102/// defined in the current TU.
2103static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr,
2104 QualType DstType, SourceRange OpRange) {
2105 // Check if this cast would change the calling convention of a function
2106 // pointer type.
2107 QualType SrcType = SrcExpr.get()->getType();
2108 if (Self.Context.hasSameType(SrcType, DstType) ||
2109 !SrcType->isFunctionPointerType() || !DstType->isFunctionPointerType())
2110 return;
2111 const auto *SrcFTy =
2112 SrcType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2113 const auto *DstFTy =
2114 DstType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
2115 CallingConv SrcCC = SrcFTy->getCallConv();
2116 CallingConv DstCC = DstFTy->getCallConv();
2117 if (SrcCC == DstCC)
2118 return;
2119
2120 // We have a calling convention cast. Check if the source is a pointer to a
2121 // known, specific function that has already been defined.
2122 Expr *Src = SrcExpr.get()->IgnoreParenImpCasts();
2123 if (auto *UO = dyn_cast<UnaryOperator>(Src))
2124 if (UO->getOpcode() == UO_AddrOf)
2125 Src = UO->getSubExpr()->IgnoreParenImpCasts();
2126 auto *DRE = dyn_cast<DeclRefExpr>(Src);
2127 if (!DRE)
2128 return;
2129 auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
2130 if (!FD)
2131 return;
2132
2133 // Only warn if we are casting from the default convention to a non-default
2134 // convention. This can happen when the programmer forgot to apply the calling
2135 // convention to the function declaration and then inserted this cast to
2136 // satisfy the type system.
2137 CallingConv DefaultCC = Self.getASTContext().getDefaultCallingConvention(
2138 FD->isVariadic(), FD->isCXXInstanceMember());
2139 if (DstCC == DefaultCC || SrcCC != DefaultCC)
2140 return;
2141
2142 // Diagnose this cast, as it is probably bad.
2143 StringRef SrcCCName = FunctionType::getNameForCallConv(SrcCC);
2144 StringRef DstCCName = FunctionType::getNameForCallConv(DstCC);
2145 Self.Diag(OpRange.getBegin(), diag::warn_cast_calling_conv)
2146 << SrcCCName << DstCCName << OpRange;
2147
2148 // The checks above are cheaper than checking if the diagnostic is enabled.
2149 // However, it's worth checking if the warning is enabled before we construct
2150 // a fixit.
2151 if (Self.Diags.isIgnored(diag::warn_cast_calling_conv, OpRange.getBegin()))
2152 return;
2153
2154 // Try to suggest a fixit to change the calling convention of the function
2155 // whose address was taken. Try to use the latest macro for the convention.
2156 // For example, users probably want to write "WINAPI" instead of "__stdcall"
2157 // to match the Windows header declarations.
2158 SourceLocation NameLoc = FD->getFirstDecl()->getNameInfo().getLoc();
2159 Preprocessor &PP = Self.getPreprocessor();
2160 SmallVector<TokenValue, 6> AttrTokens;
2161 SmallString<64> CCAttrText;
2162 llvm::raw_svector_ostream OS(CCAttrText);
2163 if (Self.getLangOpts().MicrosoftExt) {
2164 // __stdcall or __vectorcall
2165 OS << "__" << DstCCName;
2166 IdentifierInfo *II = PP.getIdentifierInfo(OS.str());
2167 AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2168 ? TokenValue(II->getTokenID())
2169 : TokenValue(II));
2170 } else {
2171 // __attribute__((stdcall)) or __attribute__((vectorcall))
2172 OS << "__attribute__((" << DstCCName << "))";
2173 AttrTokens.push_back(tok::kw___attribute);
2174 AttrTokens.push_back(tok::l_paren);
2175 AttrTokens.push_back(tok::l_paren);
2176 IdentifierInfo *II = PP.getIdentifierInfo(DstCCName);
2177 AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
2178 ? TokenValue(II->getTokenID())
2179 : TokenValue(II));
2180 AttrTokens.push_back(tok::r_paren);
2181 AttrTokens.push_back(tok::r_paren);
2182 }
2183 StringRef AttrSpelling = PP.getLastMacroWithSpelling(NameLoc, AttrTokens);
2184 if (!AttrSpelling.empty())
2185 CCAttrText = AttrSpelling;
2186 OS << ' ';
2187 Self.Diag(NameLoc, diag::note_change_calling_conv_fixit)
2188 << FD << DstCCName << FixItHint::CreateInsertion(NameLoc, CCAttrText);
2189}
2190
2191static void checkIntToPointerCast(bool CStyle, const SourceRange &OpRange,
2192 const Expr *SrcExpr, QualType DestType,
2193 Sema &Self) {
2194 QualType SrcType = SrcExpr->getType();
2195
2196 // Not warning on reinterpret_cast, boolean, constant expressions, etc
2197 // are not explicit design choices, but consistent with GCC's behavior.
2198 // Feel free to modify them if you've reason/evidence for an alternative.
2199 if (CStyle && SrcType->isIntegralType(Self.Context)
2200 && !SrcType->isBooleanType()
2201 && !SrcType->isEnumeralType()
2202 && !SrcExpr->isIntegerConstantExpr(Self.Context)
2203 && Self.Context.getTypeSize(DestType) >
2204 Self.Context.getTypeSize(SrcType)) {
2205 // Separate between casts to void* and non-void* pointers.
2206 // Some APIs use (abuse) void* for something like a user context,
2207 // and often that value is an integer even if it isn't a pointer itself.
2208 // Having a separate warning flag allows users to control the warning
2209 // for their workflow.
2210 unsigned Diag = DestType->isVoidPointerType() ?
2211 diag::warn_int_to_void_pointer_cast
2212 : diag::warn_int_to_pointer_cast;
2213 Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2214 }
2215}
2216
2218 ExprResult &Result) {
2219 // We can only fix an overloaded reinterpret_cast if
2220 // - it is a template with explicit arguments that resolves to an lvalue
2221 // unambiguously, or
2222 // - it is the only function in an overload set that may have its address
2223 // taken.
2224
2225 Expr *E = Result.get();
2226 // TODO: what if this fails because of DiagnoseUseOfDecl or something
2227 // like it?
2228 if (Self.ResolveAndFixSingleFunctionTemplateSpecialization(
2229 Result,
2230 Expr::getValueKindForType(DestType) ==
2231 VK_PRValue // Convert Fun to Ptr
2232 ) &&
2233 Result.isUsable())
2234 return true;
2235
2236 // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
2237 // preserves Result.
2238 Result = E;
2239 if (!Self.resolveAndFixAddressOfSingleOverloadCandidate(
2240 Result, /*DoFunctionPointerConversion=*/true))
2241 return false;
2242 return Result.isUsable();
2243}
2244
2246 QualType DestType, bool CStyle,
2247 SourceRange OpRange,
2248 unsigned &msg,
2249 CastKind &Kind) {
2250 bool IsLValueCast = false;
2251
2252 DestType = Self.Context.getCanonicalType(DestType);
2253 QualType SrcType = SrcExpr.get()->getType();
2254
2255 // Is the source an overloaded name? (i.e. &foo)
2256 // If so, reinterpret_cast generally can not help us here (13.4, p1, bullet 5)
2257 if (SrcType == Self.Context.OverloadTy) {
2258 ExprResult FixedExpr = SrcExpr;
2259 if (!fixOverloadedReinterpretCastExpr(Self, DestType, FixedExpr))
2260 return TC_NotApplicable;
2261
2262 assert(FixedExpr.isUsable() && "Invalid result fixing overloaded expr");
2263 SrcExpr = FixedExpr;
2264 SrcType = SrcExpr.get()->getType();
2265 }
2266
2267 if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
2268 if (!SrcExpr.get()->isGLValue()) {
2269 // Cannot cast non-glvalue to (lvalue or rvalue) reference type. See the
2270 // similar comment in const_cast.
2271 msg = diag::err_bad_cxx_cast_rvalue;
2272 return TC_NotApplicable;
2273 }
2274
2275 if (!CStyle) {
2276 Self.CheckCompatibleReinterpretCast(SrcType, DestType,
2277 /*IsDereference=*/false, OpRange);
2278 }
2279
2280 // C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
2281 // same effect as the conversion *reinterpret_cast<T*>(&x) with the
2282 // built-in & and * operators.
2283
2284 const char *inappropriate = nullptr;
2285 switch (SrcExpr.get()->getObjectKind()) {
2286 case OK_Ordinary:
2287 break;
2288 case OK_BitField:
2289 msg = diag::err_bad_cxx_cast_bitfield;
2290 return TC_NotApplicable;
2291 // FIXME: Use a specific diagnostic for the rest of these cases.
2292 case OK_VectorComponent: inappropriate = "vector element"; break;
2293 case OK_MatrixComponent:
2294 inappropriate = "matrix element";
2295 break;
2296 case OK_ObjCProperty: inappropriate = "property expression"; break;
2297 case OK_ObjCSubscript: inappropriate = "container subscripting expression";
2298 break;
2299 }
2300 if (inappropriate) {
2301 Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_reference)
2302 << inappropriate << DestType
2303 << OpRange << SrcExpr.get()->getSourceRange();
2304 msg = 0; SrcExpr = ExprError();
2305 return TC_NotApplicable;
2306 }
2307
2308 // This code does this transformation for the checked types.
2309 DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
2310 SrcType = Self.Context.getPointerType(SrcType);
2311
2312 IsLValueCast = true;
2313 }
2314
2315 // Canonicalize source for comparison.
2316 SrcType = Self.Context.getCanonicalType(SrcType);
2317
2318 const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
2319 *SrcMemPtr = SrcType->getAs<MemberPointerType>();
2320 if (DestMemPtr && SrcMemPtr) {
2321 // C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
2322 // can be explicitly converted to an rvalue of type "pointer to member
2323 // of Y of type T2" if T1 and T2 are both function types or both object
2324 // types.
2325 if (DestMemPtr->isMemberFunctionPointer() !=
2326 SrcMemPtr->isMemberFunctionPointer())
2327 return TC_NotApplicable;
2328
2329 if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2330 // We need to determine the inheritance model that the class will use if
2331 // haven't yet.
2332 (void)Self.isCompleteType(OpRange.getBegin(), SrcType);
2333 (void)Self.isCompleteType(OpRange.getBegin(), DestType);
2334 }
2335
2336 // Don't allow casting between member pointers of different sizes.
2337 if (Self.Context.getTypeSize(DestMemPtr) !=
2338 Self.Context.getTypeSize(SrcMemPtr)) {
2339 msg = diag::err_bad_cxx_cast_member_pointer_size;
2340 return TC_Failed;
2341 }
2342
2343 // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
2344 // constness.
2345 // A reinterpret_cast followed by a const_cast can, though, so in C-style,
2346 // we accept it.
2347 if (auto CACK =
2348 CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2349 /*CheckObjCLifetime=*/CStyle))
2350 return getCastAwayConstnessCastKind(CACK, msg);
2351
2352 // A valid member pointer cast.
2353 assert(!IsLValueCast);
2354 Kind = CK_ReinterpretMemberPointer;
2355 return TC_Success;
2356 }
2357
2358 // See below for the enumeral issue.
2359 if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
2360 // C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
2361 // type large enough to hold it. A value of std::nullptr_t can be
2362 // converted to an integral type; the conversion has the same meaning
2363 // and validity as a conversion of (void*)0 to the integral type.
2364 if (Self.Context.getTypeSize(SrcType) >
2365 Self.Context.getTypeSize(DestType)) {
2366 msg = diag::err_bad_reinterpret_cast_small_int;
2367 return TC_Failed;
2368 }
2369 Kind = CK_PointerToIntegral;
2370 return TC_Success;
2371 }
2372
2373 // Allow reinterpret_casts between vectors of the same size and
2374 // between vectors and integers of the same size.
2375 bool destIsVector = DestType->isVectorType();
2376 bool srcIsVector = SrcType->isVectorType();
2377 if (srcIsVector || destIsVector) {
2378 // Allow bitcasting between SVE VLATs and VLSTs, and vice-versa.
2379 if (Self.isValidSveBitcast(SrcType, DestType)) {
2380 Kind = CK_BitCast;
2381 return TC_Success;
2382 }
2383
2384 // Allow bitcasting between SVE VLATs and VLSTs, and vice-versa.
2385 if (Self.isValidRVVBitcast(SrcType, DestType)) {
2386 Kind = CK_BitCast;
2387 return TC_Success;
2388 }
2389
2390 // The non-vector type, if any, must have integral type. This is
2391 // the same rule that C vector casts use; note, however, that enum
2392 // types are not integral in C++.
2393 if ((!destIsVector && !DestType->isIntegralType(Self.Context)) ||
2394 (!srcIsVector && !SrcType->isIntegralType(Self.Context)))
2395 return TC_NotApplicable;
2396
2397 // The size we want to consider is eltCount * eltSize.
2398 // That's exactly what the lax-conversion rules will check.
2399 if (Self.areLaxCompatibleVectorTypes(SrcType, DestType)) {
2400 Kind = CK_BitCast;
2401 return TC_Success;
2402 }
2403
2404 if (Self.LangOpts.OpenCL && !CStyle) {
2405 if (DestType->isExtVectorType() || SrcType->isExtVectorType()) {
2406 // FIXME: Allow for reinterpret cast between 3 and 4 element vectors
2407 if (Self.areVectorTypesSameSize(SrcType, DestType)) {
2408 Kind = CK_BitCast;
2409 return TC_Success;
2410 }
2411 }
2412 }
2413
2414 // Otherwise, pick a reasonable diagnostic.
2415 if (!destIsVector)
2416 msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
2417 else if (!srcIsVector)
2418 msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
2419 else
2420 msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
2421
2422 return TC_Failed;
2423 }
2424
2425 if (SrcType == DestType) {
2426 // C++ 5.2.10p2 has a note that mentions that, subject to all other
2427 // restrictions, a cast to the same type is allowed so long as it does not
2428 // cast away constness. In C++98, the intent was not entirely clear here,
2429 // since all other paragraphs explicitly forbid casts to the same type.
2430 // C++11 clarifies this case with p2.
2431 //
2432 // The only allowed types are: integral, enumeration, pointer, or
2433 // pointer-to-member types. We also won't restrict Obj-C pointers either.
2434 Kind = CK_NoOp;
2436 if (SrcType->isIntegralOrEnumerationType() ||
2437 SrcType->isAnyPointerType() ||
2438 SrcType->isMemberPointerType() ||
2439 SrcType->isBlockPointerType()) {
2441 }
2442 return Result;
2443 }
2444
2445 bool destIsPtr = DestType->isAnyPointerType() ||
2446 DestType->isBlockPointerType();
2447 bool srcIsPtr = SrcType->isAnyPointerType() ||
2448 SrcType->isBlockPointerType();
2449 if (!destIsPtr && !srcIsPtr) {
2450 // Except for std::nullptr_t->integer and lvalue->reference, which are
2451 // handled above, at least one of the two arguments must be a pointer.
2452 return TC_NotApplicable;
2453 }
2454
2455 if (DestType->isIntegralType(Self.Context)) {
2456 assert(srcIsPtr && "One type must be a pointer");
2457 // C++ 5.2.10p4: A pointer can be explicitly converted to any integral
2458 // type large enough to hold it; except in Microsoft mode, where the
2459 // integral type size doesn't matter (except we don't allow bool).
2460 if ((Self.Context.getTypeSize(SrcType) >
2461 Self.Context.getTypeSize(DestType))) {
2462 bool MicrosoftException =
2463 Self.getLangOpts().MicrosoftExt && !DestType->isBooleanType();
2464 if (MicrosoftException) {
2465 unsigned Diag = SrcType->isVoidPointerType()
2466 ? diag::warn_void_pointer_to_int_cast
2467 : diag::warn_pointer_to_int_cast;
2468 Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
2469 } else {
2470 msg = diag::err_bad_reinterpret_cast_small_int;
2471 return TC_Failed;
2472 }
2473 }
2474 Kind = CK_PointerToIntegral;
2475 return TC_Success;
2476 }
2477
2478 if (SrcType->isIntegralOrEnumerationType()) {
2479 assert(destIsPtr && "One type must be a pointer");
2480 checkIntToPointerCast(CStyle, OpRange, SrcExpr.get(), DestType, Self);
2481 // C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
2482 // converted to a pointer.
2483 // C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
2484 // necessarily converted to a null pointer value.]
2485 Kind = CK_IntegralToPointer;
2486 return TC_Success;
2487 }
2488
2489 if (!destIsPtr || !srcIsPtr) {
2490 // With the valid non-pointer conversions out of the way, we can be even
2491 // more stringent.
2492 return TC_NotApplicable;
2493 }
2494
2495 // Cannot convert between block pointers and Objective-C object pointers.
2496 if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) ||
2497 (DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
2498 return TC_NotApplicable;
2499
2500 // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
2501 // The C-style cast operator can.
2502 TryCastResult SuccessResult = TC_Success;
2503 if (auto CACK =
2504 CastsAwayConstness(Self, SrcType, DestType, /*CheckCVR=*/!CStyle,
2505 /*CheckObjCLifetime=*/CStyle))
2506 SuccessResult = getCastAwayConstnessCastKind(CACK, msg);
2507
2508 if (IsAddressSpaceConversion(SrcType, DestType)) {
2509 Kind = CK_AddressSpaceConversion;
2510 assert(SrcType->isPointerType() && DestType->isPointerType());
2511 if (!CStyle &&
2513 SrcType->getPointeeType().getQualifiers())) {
2514 SuccessResult = TC_Failed;
2515 }
2516 } else if (IsLValueCast) {
2517 Kind = CK_LValueBitCast;
2518 } else if (DestType->isObjCObjectPointerType()) {
2519 Kind = Self.PrepareCastToObjCObjectPointer(SrcExpr);
2520 } else if (DestType->isBlockPointerType()) {
2521 if (!SrcType->isBlockPointerType()) {
2522 Kind = CK_AnyPointerToBlockPointerCast;
2523 } else {
2524 Kind = CK_BitCast;
2525 }
2526 } else {
2527 Kind = CK_BitCast;
2528 }
2529
2530 // Any pointer can be cast to an Objective-C pointer type with a C-style
2531 // cast.
2532 if (CStyle && DestType->isObjCObjectPointerType()) {
2533 return SuccessResult;
2534 }
2535 if (CStyle)
2536 DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2537
2538 DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2539
2540 // Not casting away constness, so the only remaining check is for compatible
2541 // pointer categories.
2542
2543 if (SrcType->isFunctionPointerType()) {
2544 if (DestType->isFunctionPointerType()) {
2545 // C++ 5.2.10p6: A pointer to a function can be explicitly converted to
2546 // a pointer to a function of a different type.
2547 return SuccessResult;
2548 }
2549
2550 // C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
2551 // an object type or vice versa is conditionally-supported.
2552 // Compilers support it in C++03 too, though, because it's necessary for
2553 // casting the return value of dlsym() and GetProcAddress().
2554 // FIXME: Conditionally-supported behavior should be configurable in the
2555 // TargetInfo or similar.
2556 Self.Diag(OpRange.getBegin(),
2557 Self.getLangOpts().CPlusPlus11 ?
2558 diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2559 << OpRange;
2560 return SuccessResult;
2561 }
2562
2563 if (DestType->isFunctionPointerType()) {
2564 // See above.
2565 Self.Diag(OpRange.getBegin(),
2566 Self.getLangOpts().CPlusPlus11 ?
2567 diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2568 << OpRange;
2569 return SuccessResult;
2570 }
2571
2572 // Diagnose address space conversion in nested pointers.
2573 QualType DestPtee = DestType->getPointeeType().isNull()
2574 ? DestType->getPointeeType()
2575 : DestType->getPointeeType()->getPointeeType();
2576 QualType SrcPtee = SrcType->getPointeeType().isNull()
2577 ? SrcType->getPointeeType()
2578 : SrcType->getPointeeType()->getPointeeType();
2579 while (!DestPtee.isNull() && !SrcPtee.isNull()) {
2580 if (DestPtee.getAddressSpace() != SrcPtee.getAddressSpace()) {
2581 Self.Diag(OpRange.getBegin(),
2582 diag::warn_bad_cxx_cast_nested_pointer_addr_space)
2583 << CStyle << SrcType << DestType << SrcExpr.get()->getSourceRange();
2584 break;
2585 }
2586 DestPtee = DestPtee->getPointeeType();
2587 SrcPtee = SrcPtee->getPointeeType();
2588 }
2589
2590 // C++ 5.2.10p7: A pointer to an object can be explicitly converted to
2591 // a pointer to an object of different type.
2592 // Void pointers are not specified, but supported by every compiler out there.
2593 // So we finish by allowing everything that remains - it's got to be two
2594 // object pointers.
2595 return SuccessResult;
2596}
2597
2599 QualType DestType, bool CStyle,
2600 unsigned &msg, CastKind &Kind) {
2601 if (!Self.getLangOpts().OpenCL && !Self.getLangOpts().SYCLIsDevice)
2602 // FIXME: As compiler doesn't have any information about overlapping addr
2603 // spaces at the moment we have to be permissive here.
2604 return TC_NotApplicable;
2605 // Even though the logic below is general enough and can be applied to
2606 // non-OpenCL mode too, we fast-path above because no other languages
2607 // define overlapping address spaces currently.
2608 auto SrcType = SrcExpr.get()->getType();
2609 // FIXME: Should this be generalized to references? The reference parameter
2610 // however becomes a reference pointee type here and therefore rejected.
2611 // Perhaps this is the right behavior though according to C++.
2612 auto SrcPtrType = SrcType->getAs<PointerType>();
2613 if (!SrcPtrType)
2614 return TC_NotApplicable;
2615 auto DestPtrType = DestType->getAs<PointerType>();
2616 if (!DestPtrType)
2617 return TC_NotApplicable;
2618 auto SrcPointeeType = SrcPtrType->getPointeeType();
2619 auto DestPointeeType = DestPtrType->getPointeeType();
2620 if (!DestPointeeType.isAddressSpaceOverlapping(SrcPointeeType)) {
2621 msg = diag::err_bad_cxx_cast_addr_space_mismatch;
2622 return TC_Failed;
2623 }
2624 auto SrcPointeeTypeWithoutAS =
2625 Self.Context.removeAddrSpaceQualType(SrcPointeeType.getCanonicalType());
2626 auto DestPointeeTypeWithoutAS =
2627 Self.Context.removeAddrSpaceQualType(DestPointeeType.getCanonicalType());
2628 if (Self.Context.hasSameType(SrcPointeeTypeWithoutAS,
2629 DestPointeeTypeWithoutAS)) {
2630 Kind = SrcPointeeType.getAddressSpace() == DestPointeeType.getAddressSpace()
2631 ? CK_NoOp
2632 : CK_AddressSpaceConversion;
2633 return TC_Success;
2634 } else {
2635 return TC_NotApplicable;
2636 }
2637}
2638
2639void CastOperation::checkAddressSpaceCast(QualType SrcType, QualType DestType) {
2640 // In OpenCL only conversions between pointers to objects in overlapping
2641 // addr spaces are allowed. v2.0 s6.5.5 - Generic addr space overlaps
2642 // with any named one, except for constant.
2643
2644 // Converting the top level pointee addrspace is permitted for compatible
2645 // addrspaces (such as 'generic int *' to 'local int *' or vice versa), but
2646 // if any of the nested pointee addrspaces differ, we emit a warning
2647 // regardless of addrspace compatibility. This makes
2648 // local int ** p;
2649 // return (generic int **) p;
2650 // warn even though local -> generic is permitted.
2651 if (Self.getLangOpts().OpenCL) {
2652 const Type *DestPtr, *SrcPtr;
2653 bool Nested = false;
2654 unsigned DiagID = diag::err_typecheck_incompatible_address_space;
2655 DestPtr = Self.getASTContext().getCanonicalType(DestType.getTypePtr()),
2656 SrcPtr = Self.getASTContext().getCanonicalType(SrcType.getTypePtr());
2657
2658 while (isa<PointerType>(DestPtr) && isa<PointerType>(SrcPtr)) {
2659 const PointerType *DestPPtr = cast<PointerType>(DestPtr);
2660 const PointerType *SrcPPtr = cast<PointerType>(SrcPtr);
2661 QualType DestPPointee = DestPPtr->getPointeeType();
2662 QualType SrcPPointee = SrcPPtr->getPointeeType();
2663 if (Nested
2664 ? DestPPointee.getAddressSpace() != SrcPPointee.getAddressSpace()
2665 : !DestPPointee.isAddressSpaceOverlapping(SrcPPointee)) {
2666 Self.Diag(OpRange.getBegin(), DiagID)
2667 << SrcType << DestType << Sema::AA_Casting
2668 << SrcExpr.get()->getSourceRange();
2669 if (!Nested)
2670 SrcExpr = ExprError();
2671 return;
2672 }
2673
2674 DestPtr = DestPPtr->getPointeeType().getTypePtr();
2675 SrcPtr = SrcPPtr->getPointeeType().getTypePtr();
2676 Nested = true;
2677 DiagID = diag::ext_nested_pointer_qualifier_mismatch;
2678 }
2679 }
2680}
2681
2683 bool SrcCompatXL = this->getLangOpts().getAltivecSrcCompat() ==
2685 VectorKind VKind = VecTy->getVectorKind();
2686
2687 if ((VKind == VectorKind::AltiVecVector) ||
2688 (SrcCompatXL && ((VKind == VectorKind::AltiVecBool) ||
2689 (VKind == VectorKind::AltiVecPixel)))) {
2690 return true;
2691 }
2692 return false;
2693}
2694
2696 QualType SrcTy) {
2697 bool SrcCompatGCC = this->getLangOpts().getAltivecSrcCompat() ==
2699 if (this->getLangOpts().AltiVec && SrcCompatGCC) {
2700 this->Diag(R.getBegin(),
2701 diag::err_invalid_conversion_between_vector_and_integer)
2702 << VecTy << SrcTy << R;
2703 return true;
2704 }
2705 return false;
2706}
2707
2708void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
2709 bool ListInitialization) {
2710 assert(Self.getLangOpts().CPlusPlus);
2711
2712 // Handle placeholders.
2713 if (isPlaceholder()) {
2714 // C-style casts can resolve __unknown_any types.
2715 if (claimPlaceholder(BuiltinType::UnknownAny)) {
2716 SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2717 SrcExpr.get(), Kind,
2718 ValueKind, BasePath);
2719 return;
2720 }
2721
2722 checkNonOverloadPlaceholders();
2723 if (SrcExpr.isInvalid())
2724 return;
2725 }
2726
2727 // C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
2728 // This test is outside everything else because it's the only case where
2729 // a non-lvalue-reference target type does not lead to decay.
2730 if (DestType->isVoidType()) {
2731 Kind = CK_ToVoid;
2732
2733 if (claimPlaceholder(BuiltinType::Overload)) {
2734 Self.ResolveAndFixSingleFunctionTemplateSpecialization(
2735 SrcExpr, /* Decay Function to ptr */ false,
2736 /* Complain */ true, DestRange, DestType,
2737 diag::err_bad_cstyle_cast_overload);
2738 if (SrcExpr.isInvalid())
2739 return;
2740 }
2741
2742 SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2743 return;
2744 }
2745
2746 // If the type is dependent, we won't do any other semantic analysis now.
2747 if (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2748 SrcExpr.get()->isValueDependent()) {
2749 assert(Kind == CK_Dependent);
2750 return;
2751 }
2752
2753 if (ValueKind == VK_PRValue && !DestType->isRecordType() &&
2754 !isPlaceholder(BuiltinType::Overload)) {
2755 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2756 if (SrcExpr.isInvalid())
2757 return;
2758 }
2759
2760 // AltiVec vector initialization with a single literal.
2761 if (const VectorType *vecTy = DestType->getAs<VectorType>()) {
2762 if (Self.CheckAltivecInitFromScalar(OpRange, DestType,
2763 SrcExpr.get()->getType())) {
2764 SrcExpr = ExprError();
2765 return;
2766 }
2767 if (Self.ShouldSplatAltivecScalarInCast(vecTy) &&
2768 (SrcExpr.get()->getType()->isIntegerType() ||
2769 SrcExpr.get()->getType()->isFloatingType())) {
2770 Kind = CK_VectorSplat;
2771 SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2772 return;
2773 }
2774 }
2775
2776 // WebAssembly tables cannot be cast.
2777 QualType SrcType = SrcExpr.get()->getType();
2778 if (SrcType->isWebAssemblyTableType()) {
2779 Self.Diag(OpRange.getBegin(), diag::err_wasm_cast_table)
2780 << 1 << SrcExpr.get()->getSourceRange();
2781 SrcExpr = ExprError();
2782 return;
2783 }
2784
2785 // C++ [expr.cast]p5: The conversions performed by
2786 // - a const_cast,
2787 // - a static_cast,
2788 // - a static_cast followed by a const_cast,
2789 // - a reinterpret_cast, or
2790 // - a reinterpret_cast followed by a const_cast,
2791 // can be performed using the cast notation of explicit type conversion.
2792 // [...] If a conversion can be interpreted in more than one of the ways
2793 // listed above, the interpretation that appears first in the list is used,
2794 // even if a cast resulting from that interpretation is ill-formed.
2795 // In plain language, this means trying a const_cast ...
2796 // Note that for address space we check compatibility after const_cast.
2797 unsigned msg = diag::err_bad_cxx_cast_generic;
2798 TryCastResult tcr = TryConstCast(Self, SrcExpr, DestType,
2799 /*CStyle*/ true, msg);
2800 if (SrcExpr.isInvalid())
2801 return;
2802 if (isValidCast(tcr))
2803 Kind = CK_NoOp;
2804
2807 if (tcr == TC_NotApplicable) {
2808 tcr = TryAddressSpaceCast(Self, SrcExpr, DestType, /*CStyle*/ true, msg,
2809 Kind);
2810 if (SrcExpr.isInvalid())
2811 return;
2812
2813 if (tcr == TC_NotApplicable) {
2814 // ... or if that is not possible, a static_cast, ignoring const and
2815 // addr space, ...
2816 tcr = TryStaticCast(Self, SrcExpr, DestType, CCK, OpRange, msg, Kind,
2817 BasePath, ListInitialization);
2818 if (SrcExpr.isInvalid())
2819 return;
2820
2821 if (tcr == TC_NotApplicable) {
2822 // ... and finally a reinterpret_cast, ignoring const and addr space.
2823 tcr = TryReinterpretCast(Self, SrcExpr, DestType, /*CStyle*/ true,
2824 OpRange, msg, Kind);
2825 if (SrcExpr.isInvalid())
2826 return;
2827 }
2828 }
2829 }
2830
2831 if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
2832 isValidCast(tcr))
2833 checkObjCConversion(CCK);
2834
2835 if (tcr != TC_Success && msg != 0) {
2836 if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2837 DeclAccessPair Found;
2838 FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
2839 DestType,
2840 /*Complain*/ true,
2841 Found);
2842 if (Fn) {
2843 // If DestType is a function type (not to be confused with the function
2844 // pointer type), it will be possible to resolve the function address,
2845 // but the type cast should be considered as failure.
2846 OverloadExpr *OE = OverloadExpr::find(SrcExpr.get()).Expression;
2847 Self.Diag(OpRange.getBegin(), diag::err_bad_cstyle_cast_overload)
2848 << OE->getName() << DestType << OpRange
2850 Self.NoteAllOverloadCandidates(SrcExpr.get());
2851 }
2852 } else {
2853 diagnoseBadCast(Self, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
2854 OpRange, SrcExpr.get(), DestType, ListInitialization);
2855 }
2856 }
2857
2858 if (isValidCast(tcr)) {
2859 if (Kind == CK_BitCast)
2860 checkCastAlign();
2861
2862 if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
2863 Self.Diag(OpRange.getBegin(), DiagID)
2864 << SrcExpr.get()->getType() << DestType << OpRange;
2865
2866 } else {
2867 SrcExpr = ExprError();
2868 }
2869}
2870
2871/// DiagnoseBadFunctionCast - Warn whenever a function call is cast to a
2872/// non-matching type. Such as enum function call to int, int call to
2873/// pointer; etc. Cast to 'void' is an exception.
2874static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr,
2875 QualType DestType) {
2876 if (Self.Diags.isIgnored(diag::warn_bad_function_cast,
2877 SrcExpr.get()->getExprLoc()))
2878 return;
2879
2880 if (!isa<CallExpr>(SrcExpr.get()))
2881 return;
2882
2883 QualType SrcType = SrcExpr.get()->getType();
2884 if (DestType.getUnqualifiedType()->isVoidType())
2885 return;
2886 if ((SrcType->isAnyPointerType() || SrcType->isBlockPointerType())
2887 && (DestType->isAnyPointerType() || DestType->isBlockPointerType()))
2888 return;
2889 if (SrcType->isIntegerType() && DestType->isIntegerType() &&
2890 (SrcType->isBooleanType() == DestType->isBooleanType()) &&
2891 (SrcType->isEnumeralType() == DestType->isEnumeralType()))
2892 return;
2893 if (SrcType->isRealFloatingType() && DestType->isRealFloatingType())
2894 return;
2895 if (SrcType->isEnumeralType() && DestType->isEnumeralType())
2896 return;
2897 if (SrcType->isComplexType() && DestType->isComplexType())
2898 return;
2899 if (SrcType->isComplexIntegerType() && DestType->isComplexIntegerType())
2900 return;
2901 if (SrcType->isFixedPointType() && DestType->isFixedPointType())
2902 return;
2903
2904 Self.Diag(SrcExpr.get()->getExprLoc(),
2905 diag::warn_bad_function_cast)
2906 << SrcType << DestType << SrcExpr.get()->getSourceRange();
2907}
2908
2909/// Check the semantics of a C-style cast operation, in C.
2910void CastOperation::CheckCStyleCast() {
2911 assert(!Self.getLangOpts().CPlusPlus);
2912
2913 // C-style casts can resolve __unknown_any types.
2914 if (claimPlaceholder(BuiltinType::UnknownAny)) {
2915 SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2916 SrcExpr.get(), Kind,
2917 ValueKind, BasePath);
2918 return;
2919 }
2920
2921 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2922 // type needs to be scalar.
2923 if (DestType->isVoidType()) {
2924 // We don't necessarily do lvalue-to-rvalue conversions on this.
2925 SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2926 if (SrcExpr.isInvalid())
2927 return;
2928
2929 // Cast to void allows any expr type.
2930 Kind = CK_ToVoid;
2931 return;
2932 }
2933
2934 // If the type is dependent, we won't do any other semantic analysis now.
2935 if (Self.getASTContext().isDependenceAllowed() &&
2936 (DestType->isDependentType() || SrcExpr.get()->isTypeDependent() ||
2937 SrcExpr.get()->isValueDependent())) {
2938 assert((DestType->containsErrors() || SrcExpr.get()->containsErrors() ||
2939 SrcExpr.get()->containsErrors()) &&
2940 "should only occur in error-recovery path.");
2941 assert(Kind == CK_Dependent);
2942 return;
2943 }
2944
2945 // Overloads are allowed with C extensions, so we need to support them.
2946 if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2947 DeclAccessPair DAP;
2948 if (FunctionDecl *FD = Self.ResolveAddressOfOverloadedFunction(
2949 SrcExpr.get(), DestType, /*Complain=*/true, DAP))
2950 SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr.get(), DAP, FD);
2951 else
2952 return;
2953 assert(SrcExpr.isUsable());
2954 }
2955 SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2956 if (SrcExpr.isInvalid())
2957 return;
2958 QualType SrcType = SrcExpr.get()->getType();
2959
2960 if (SrcType->isWebAssemblyTableType()) {
2961 Self.Diag(OpRange.getBegin(), diag::err_wasm_cast_table)
2962 << 1 << SrcExpr.get()->getSourceRange();
2963 SrcExpr = ExprError();
2964 return;
2965 }
2966
2967 assert(!SrcType->isPlaceholderType());
2968
2969 checkAddressSpaceCast(SrcType, DestType);
2970 if (SrcExpr.isInvalid())
2971 return;
2972
2973 if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
2974 diag::err_typecheck_cast_to_incomplete)) {
2975 SrcExpr = ExprError();
2976 return;
2977 }
2978
2979 // Allow casting a sizeless built-in type to itself.
2980 if (DestType->isSizelessBuiltinType() &&
2981 Self.Context.hasSameUnqualifiedType(DestType, SrcType)) {
2982 Kind = CK_NoOp;
2983 return;
2984 }
2985
2986 // Allow bitcasting between compatible SVE vector types.
2987 if ((SrcType->isVectorType() || DestType->isVectorType()) &&
2988 Self.isValidSveBitcast(SrcType, DestType)) {
2989 Kind = CK_BitCast;
2990 return;
2991 }
2992
2993 // Allow bitcasting between compatible RVV vector types.
2994 if ((SrcType->isVectorType() || DestType->isVectorType()) &&
2995 Self.isValidRVVBitcast(SrcType, DestType)) {
2996 Kind = CK_BitCast;
2997 return;
2998 }
2999
3000 if (!DestType->isScalarType() && !DestType->isVectorType() &&
3001 !DestType->isMatrixType()) {
3002 const RecordType *DestRecordTy = DestType->getAs<RecordType>();
3003
3004 if (DestRecordTy && Self.Context.hasSameUnqualifiedType(DestType, SrcType)){
3005 // GCC struct/union extension: allow cast to self.
3006 Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_nonscalar)
3007 << DestType << SrcExpr.get()->getSourceRange();
3008 Kind = CK_NoOp;
3009 return;
3010 }
3011
3012 // GCC's cast to union extension.
3013 if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
3014 RecordDecl *RD = DestRecordTy->getDecl();
3015 if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
3016 Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
3017 << SrcExpr.get()->getSourceRange();
3018 Kind = CK_ToUnion;
3019 return;
3020 } else {
3021 Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
3022 << SrcType << SrcExpr.get()->getSourceRange();
3023 SrcExpr = ExprError();
3024 return;
3025 }
3026 }
3027
3028 // OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.
3029 if (Self.getLangOpts().OpenCL && DestType->isEventT()) {
3031 if (SrcExpr.get()->EvaluateAsInt(Result, Self.Context)) {
3032 llvm::APSInt CastInt = Result.Val.getInt();
3033 if (0 == CastInt) {
3034 Kind = CK_ZeroToOCLOpaqueType;
3035 return;
3036 }
3037 Self.Diag(OpRange.getBegin(),
3038 diag::err_opencl_cast_non_zero_to_event_t)
3039 << toString(CastInt, 10) << SrcExpr.get()->getSourceRange();
3040 SrcExpr = ExprError();
3041 return;
3042 }
3043 }
3044
3045 // Reject any other conversions to non-scalar types.
3046 Self.Diag(OpRange.getBegin(), diag::err_typecheck_cond_expect_scalar)
3047 << DestType << SrcExpr.get()->getSourceRange();
3048 SrcExpr = ExprError();
3049 return;
3050 }
3051
3052 // The type we're casting to is known to be a scalar, a vector, or a matrix.
3053
3054 // Require the operand to be a scalar, a vector, or a matrix.
3055 if (!SrcType->isScalarType() && !SrcType->isVectorType() &&
3056 !SrcType->isMatrixType()) {
3057 Self.Diag(SrcExpr.get()->getExprLoc(),
3058 diag::err_typecheck_expect_scalar_operand)
3059 << SrcType << SrcExpr.get()->getSourceRange();
3060 SrcExpr = ExprError();
3061 return;
3062 }
3063
3064 // C23 6.5.4p4:
3065 // The type nullptr_t shall not be converted to any type other than void,
3066 // bool, or a pointer type. No type other than nullptr_t shall be converted
3067 // to nullptr_t.
3068 if (SrcType->isNullPtrType()) {
3069 // FIXME: 6.3.2.4p2 says that nullptr_t can be converted to itself, but
3070 // 6.5.4p4 is a constraint check and nullptr_t is not void, bool, or a
3071 // pointer type. We're not going to diagnose that as a constraint violation.
3072 if (!DestType->isVoidType() && !DestType->isBooleanType() &&
3073 !DestType->isPointerType() && !DestType->isNullPtrType()) {
3074 Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_nullptr_cast)
3075 << /*nullptr to type*/ 0 << DestType;
3076 SrcExpr = ExprError();
3077 return;
3078 }
3079 if (!DestType->isNullPtrType()) {
3080 // Implicitly cast from the null pointer type to the type of the
3081 // destination.
3082 CastKind CK = DestType->isPointerType() ? CK_NullToPointer : CK_BitCast;
3083 SrcExpr = ImplicitCastExpr::Create(Self.Context, DestType, CK,
3084 SrcExpr.get(), nullptr, VK_PRValue,
3085 Self.CurFPFeatureOverrides());
3086 }
3087 }
3088 if (DestType->isNullPtrType() && !SrcType->isNullPtrType()) {
3089 Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_nullptr_cast)
3090 << /*type to nullptr*/ 1 << SrcType;
3091 SrcExpr = ExprError();
3092 return;
3093 }
3094
3095 if (DestType->isExtVectorType()) {
3096 SrcExpr = Self.CheckExtVectorCast(OpRange, DestType, SrcExpr.get(), Kind);
3097 return;
3098 }
3099
3100 if (DestType->getAs<MatrixType>() || SrcType->getAs<MatrixType>()) {
3101 if (Self.CheckMatrixCast(OpRange, DestType, SrcType, Kind))
3102 SrcExpr = ExprError();
3103 return;
3104 }
3105
3106 if (const VectorType *DestVecTy = DestType->getAs<VectorType>()) {
3107 if (Self.CheckAltivecInitFromScalar(OpRange, DestType, SrcType)) {
3108 SrcExpr = ExprError();
3109 return;
3110 }
3111 if (Self.ShouldSplatAltivecScalarInCast(DestVecTy) &&
3112 (SrcType->isIntegerType() || SrcType->isFloatingType())) {
3113 Kind = CK_VectorSplat;
3114 SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
3115 } else if (Self.CheckVectorCast(OpRange, DestType, SrcType, Kind)) {
3116 SrcExpr = ExprError();
3117 }
3118 return;
3119 }
3120
3121 if (SrcType->isVectorType()) {
3122 if (Self.CheckVectorCast(OpRange, SrcType, DestType, Kind))
3123 SrcExpr = ExprError();
3124 return;
3125 }
3126
3127 // The source and target types are both scalars, i.e.
3128 // - arithmetic types (fundamental, enum, and complex)
3129 // - all kinds of pointers
3130 // Note that member pointers were filtered out with C++, above.
3131
3132 if (isa<ObjCSelectorExpr>(SrcExpr.get())) {
3133 Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_selector_expr);
3134 SrcExpr = ExprError();
3135 return;
3136 }
3137
3138 // If either type is a pointer, the other type has to be either an
3139 // integer or a pointer.
3140 if (!DestType->isArithmeticType()) {
3141 if (!SrcType->isIntegralType(Self.Context) && SrcType->isArithmeticType()) {
3142 Self.Diag(SrcExpr.get()->getExprLoc(),
3143 diag::err_cast_pointer_from_non_pointer_int)
3144 << SrcType << SrcExpr.get()->getSourceRange();
3145 SrcExpr = ExprError();
3146 return;
3147 }
3148 checkIntToPointerCast(/* CStyle */ true, OpRange, SrcExpr.get(), DestType,
3149 Self);
3150 } else if (!SrcType->isArithmeticType()) {
3151 if (!DestType->isIntegralType(Self.Context) &&
3152 DestType->isArithmeticType()) {
3153 Self.Diag(SrcExpr.get()->getBeginLoc(),
3154 diag::err_cast_pointer_to_non_pointer_int)
3155 << DestType << SrcExpr.get()->getSourceRange();
3156 SrcExpr = ExprError();
3157 return;
3158 }
3159
3160 if ((Self.Context.getTypeSize(SrcType) >
3161 Self.Context.getTypeSize(DestType)) &&
3162 !DestType->isBooleanType()) {
3163 // C 6.3.2.3p6: Any pointer type may be converted to an integer type.
3164 // Except as previously specified, the result is implementation-defined.
3165 // If the result cannot be represented in the integer type, the behavior
3166 // is undefined. The result need not be in the range of values of any
3167 // integer type.
3168 unsigned Diag;
3169 if (SrcType->isVoidPointerType())
3170 Diag = DestType->isEnumeralType() ? diag::warn_void_pointer_to_enum_cast
3171 : diag::warn_void_pointer_to_int_cast;
3172 else if (DestType->isEnumeralType())
3173 Diag = diag::warn_pointer_to_enum_cast;
3174 else
3175 Diag = diag::warn_pointer_to_int_cast;
3176 Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
3177 }
3178 }
3179
3180 if (Self.getLangOpts().OpenCL && !Self.getOpenCLOptions().isAvailableOption(
3181 "cl_khr_fp16", Self.getLangOpts())) {
3182 if (DestType->isHalfType()) {
3183 Self.Diag(SrcExpr.get()->getBeginLoc(), diag::err_opencl_cast_to_half)
3184 << DestType << SrcExpr.get()->getSourceRange();
3185 SrcExpr = ExprError();
3186 return;
3187 }
3188 }
3189
3190 // ARC imposes extra restrictions on casts.
3191 if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers()) {
3192 checkObjCConversion(Sema::CCK_CStyleCast);
3193 if (SrcExpr.isInvalid())
3194 return;
3195
3196 const PointerType *CastPtr = DestType->getAs<PointerType>();
3197 if (Self.getLangOpts().ObjCAutoRefCount && CastPtr) {
3198 if (const PointerType *ExprPtr = SrcType->getAs<PointerType>()) {
3199 Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
3200 Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
3201 if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
3202 ExprPtr->getPointeeType()->isObjCLifetimeType() &&
3203 !CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
3204 Self.Diag(SrcExpr.get()->getBeginLoc(),
3205 diag::err_typecheck_incompatible_ownership)
3206 << SrcType << DestType << Sema::AA_Casting
3207 << SrcExpr.get()->getSourceRange();
3208 return;
3209 }
3210 }
3211 }
3212 else if (!Self.CheckObjCARCUnavailableWeakConversion(DestType, SrcType)) {
3213 Self.Diag(SrcExpr.get()->getBeginLoc(),
3214 diag::err_arc_convesion_of_weak_unavailable)
3215 << 1 << SrcType << DestType << SrcExpr.get()->getSourceRange();
3216 SrcExpr = ExprError();
3217 return;
3218 }
3219 }
3220
3221 if (unsigned DiagID = checkCastFunctionType(Self, SrcExpr, DestType))
3222 Self.Diag(OpRange.getBegin(), DiagID) << SrcType << DestType << OpRange;
3223
3224 if (isa<PointerType>(SrcType) && isa<PointerType>(DestType)) {
3225 QualType SrcTy = cast<PointerType>(SrcType)->getPointeeType();
3226 QualType DestTy = cast<PointerType>(DestType)->getPointeeType();
3227
3228 const RecordDecl *SrcRD = SrcTy->getAsRecordDecl();
3229 const RecordDecl *DestRD = DestTy->getAsRecordDecl();
3230
3231 if (SrcRD && DestRD && SrcRD->hasAttr<RandomizeLayoutAttr>() &&
3232 SrcRD != DestRD) {
3233 // The struct we are casting the pointer from was randomized.
3234 Self.Diag(OpRange.getBegin(), diag::err_cast_from_randomized_struct)
3235 << SrcType << DestType;
3236 SrcExpr = ExprError();
3237 return;
3238 }
3239 }
3240
3241 DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
3242 DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
3243 DiagnoseBadFunctionCast(Self, SrcExpr, DestType);
3244 Kind = Self.PrepareScalarCast(SrcExpr, DestType);
3245 if (SrcExpr.isInvalid())
3246 return;
3247
3248 if (Kind == CK_BitCast)
3249 checkCastAlign();
3250}
3251
3252void CastOperation::CheckBuiltinBitCast() {
3253 QualType SrcType = SrcExpr.get()->getType();
3254
3255 if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
3256 diag::err_typecheck_cast_to_incomplete) ||
3257 Self.RequireCompleteType(OpRange.getBegin(), SrcType,
3258 diag::err_incomplete_type)) {
3259 SrcExpr = ExprError();
3260 return;
3261 }
3262
3263 if (SrcExpr.get()->isPRValue())
3264 SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcType, SrcExpr.get(),
3265 /*IsLValueReference=*/false);
3266
3267 CharUnits DestSize = Self.Context.getTypeSizeInChars(DestType);
3268 CharUnits SourceSize = Self.Context.getTypeSizeInChars(SrcType);
3269 if (DestSize != SourceSize) {
3270 Self.Diag(OpRange.getBegin(), diag::err_bit_cast_type_size_mismatch)
3271 << (int)SourceSize.getQuantity() << (int)DestSize.getQuantity();
3272 SrcExpr = ExprError();
3273 return;
3274 }
3275
3276 if (!DestType.isTriviallyCopyableType(Self.Context)) {
3277 Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3278 << 1;
3279 SrcExpr = ExprError();
3280 return;
3281 }
3282
3283 if (!SrcType.isTriviallyCopyableType(Self.Context)) {
3284 Self.Diag(OpRange.getBegin(), diag::err_bit_cast_non_trivially_copyable)
3285 << 0;
3286 SrcExpr = ExprError();
3287 return;
3288 }
3289
3290 Kind = CK_LValueToRValueBitCast;
3291}
3292
3293/// DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either
3294/// const, volatile or both.
3295static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
3296 QualType DestType) {
3297 if (SrcExpr.isInvalid())
3298 return;
3299
3300 QualType SrcType = SrcExpr.get()->getType();
3301 if (!((SrcType->isAnyPointerType() && DestType->isAnyPointerType()) ||
3302 DestType->isLValueReferenceType()))
3303 return;
3304
3305 QualType TheOffendingSrcType, TheOffendingDestType;
3306 Qualifiers CastAwayQualifiers;
3307 if (CastsAwayConstness(Self, SrcType, DestType, true, false,
3308 &TheOffendingSrcType, &TheOffendingDestType,
3309 &CastAwayQualifiers) !=
3310 CastAwayConstnessKind::CACK_Similar)
3311 return;
3312
3313 // FIXME: 'restrict' is not properly handled here.
3314 int qualifiers = -1;
3315 if (CastAwayQualifiers.hasConst() && CastAwayQualifiers.hasVolatile()) {
3316 qualifiers = 0;
3317 } else if (CastAwayQualifiers.hasConst()) {
3318 qualifiers = 1;
3319 } else if (CastAwayQualifiers.hasVolatile()) {
3320 qualifiers = 2;
3321 }
3322 // This is a variant of int **x; const int **y = (const int **)x;
3323 if (qualifiers == -1)
3324 Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual2)
3325 << SrcType << DestType;
3326 else
3327 Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual)
3328 << TheOffendingSrcType << TheOffendingDestType << qualifiers;
3329}
3330
3332 TypeSourceInfo *CastTypeInfo,
3333 SourceLocation RPLoc,
3334 Expr *CastExpr) {
3335 CastOperation Op(*this, CastTypeInfo->getType(), CastExpr);
3336 Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3337 Op.OpRange = SourceRange(LPLoc, CastExpr->getEndLoc());
3338
3339 if (getLangOpts().CPlusPlus) {
3340 Op.CheckCXXCStyleCast(/*FunctionalCast=*/ false,
3341 isa<InitListExpr>(CastExpr));
3342 } else {
3343 Op.CheckCStyleCast();
3344 }
3345
3346 if (Op.SrcExpr.isInvalid())
3347 return ExprError();
3348
3349 // -Wcast-qual
3350 DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
3351
3352 return Op.complete(CStyleCastExpr::Create(
3353 Context, Op.ResultType, Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
3354 &Op.BasePath, CurFPFeatureOverrides(), CastTypeInfo, LPLoc, RPLoc));
3355}
3356
3358 QualType Type,
3359 SourceLocation LPLoc,
3360 Expr *CastExpr,
3361 SourceLocation RPLoc) {
3362 assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
3363 CastOperation Op(*this, Type, CastExpr);
3364 Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
3365 Op.OpRange = SourceRange(Op.DestRange.getBegin(), RPLoc);
3366
3367 Op.CheckCXXCStyleCast(/*FunctionalCast=*/true, /*ListInit=*/false);
3368 if (Op.SrcExpr.isInvalid())
3369 return ExprError();
3370
3371 auto *SubExpr = Op.SrcExpr.get();
3372 if (auto *BindExpr = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
3373 SubExpr = BindExpr->getSubExpr();
3374 if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
3375 ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
3376
3377 // -Wcast-qual
3378 DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
3379
3380 return Op.complete(CXXFunctionalCastExpr::Create(
3381 Context, Op.ResultType, Op.ValueKind, CastTypeInfo, Op.Kind,
3382 Op.SrcExpr.get(), &Op.BasePath, CurFPFeatureOverrides(), LPLoc, RPLoc));
3383}
Defines the clang::ASTContext interface.
Defines the clang::Expr interface and subclasses for C++ expressions.
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.
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream.
Defines the clang::Preprocessor interface.
static std::string toString(const clang::SanitizerSet &Sanitizers)
Produce a string containing comma-separated names of sanitizers in Sanitizers set.
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:989
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:662
static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK, unsigned &DiagID)
Definition: SemaCast.cpp:757
static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType)
Definition: SemaCast.cpp:1293
CastType
Definition: SemaCast.cpp:47
@ CT_Reinterpret
reinterpret_cast
Definition: SemaCast.cpp:50
@ CT_Functional
Type(expr)
Definition: SemaCast.cpp:53
@ CT_Dynamic
dynamic_cast
Definition: SemaCast.cpp:51
@ CT_Const
const_cast
Definition: SemaCast.cpp:48
@ CT_CStyle
(Type)expr
Definition: SemaCast.cpp:52
@ CT_Addrspace
addrspace_cast
Definition: SemaCast.cpp:54
@ CT_Static
static_cast
Definition: SemaCast.cpp:49
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:1931
static bool isValidCast(TryCastResult TCR)
Definition: SemaCast.cpp:43
static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType, SourceRange opRange, Expr *src, QualType destType, bool listInitialization)
Diagnose a failed cast.
Definition: SemaCast.cpp:517
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:421
static bool argTypeIsABIEquivalent(QualType SrcType, QualType DestType, ASTContext &Context)
Definition: SemaCast.cpp:1080
static unsigned int checkCastFunctionType(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:1094
TryCastResult
Definition: SemaCast.cpp:34
@ TC_Success
The cast method is appropriate and successful.
Definition: SemaCast.cpp:36
@ TC_Extension
The cast method is appropriate and accepted as a language extension.
Definition: SemaCast.cpp:37
@ TC_Failed
The cast method is appropriate, but failed.
Definition: SemaCast.cpp:39
@ TC_NotApplicable
The cast method is not applicable.
Definition: SemaCast.cpp:35
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:1307
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:1876
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:1574
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:3295
static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr, QualType DestType)
Definition: SemaCast.cpp:2084
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:2874
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:1646
static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, SourceRange OpRange, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2245
static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType, ExprResult &Result)
Definition: SemaCast.cpp:2217
static CastAwayConstnessKind unwrapCastAwayConstnessLevel(ASTContext &Context, QualType &T1, QualType &T2)
Unwrap one level of types for CastsAwayConstness.
Definition: SemaCast.cpp:584
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:2103
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:1519
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:1758
static void checkIntToPointerCast(bool CStyle, const SourceRange &OpRange, const Expr *SrcExpr, QualType DestType, Sema &Self)
Definition: SemaCast.cpp:2191
static TryCastResult TryAddressSpaceCast(Sema &Self, ExprResult &SrcExpr, QualType DestType, bool CStyle, unsigned &msg, CastKind &Kind)
Definition: SemaCast.cpp:2598
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:1612
TextDiagnosticBuffer::DiagList DiagList
__device__ int
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:182
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 ...
const LangOptions & getLangOpts() const
Definition: ASTContext.h:770
TypeInfoChars getTypeInfoInChars(const Type *T) const
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2592
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2315
bool UnwrapSimilarTypes(QualType &T1, QualType &T2, bool AllowPiMismatch=true)
Attempt to unwrap two types that may be similar (C++ [conv.qual]).
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:38
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:249
PtrTy get() const
Definition: Ownership.h:170
bool isInvalid() const
Definition: Ownership.h:166
bool isUsable() const
Definition: Ownership.h:168
Represents a C++2a __builtin_bit_cast(T, v) expression.
Definition: ExprCXX.h:5230
This class is used for builtin types like 'int'.
Definition: Type.h:2739
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:2080
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:840
Represents a path from a specific derived class (which is not represented as part of the path) to a p...
BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
paths_iterator begin()
paths_iterator end()
std::list< CXXBasePath >::const_iterator const_paths_iterator
static CXXConstCastExpr * Create(const ASTContext &Context, QualType T, ExprValueKind VK, Expr *Op, TypeSourceInfo *WrittenTy, SourceLocation L, SourceLocation RParenLoc, SourceRange AngleBrackets)
Definition: ExprCXX.cpp:826
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:738
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:852
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2053
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined.
Definition: DeclCXX.h:2179
Represents a C++ struct/union/class.
Definition: DeclCXX.h:258
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
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:803
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:712
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
CanProxy< U > getAs() const
Retrieve a canonical type pointer with a different static type, upcasting or downcasting as needed.
bool isAtLeastAsQualifiedAs(CanQual< T > Other) const
Determines whether this canonical type is at least as qualified as the Other canonical type.
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3465
static const FieldDecl * getTargetFieldForToUnionCast(QualType unionType, QualType opType)
Definition: Expr.cpp:2009
Expr * getSubExpr()
Definition: Expr.h:3515
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:185
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
A POD class for pairing a NamedDecl* with an access specifier.
bool isInvalidDecl() const
Definition: DeclBase.h:593
bool hasAttr() const
Definition: DeclBase.h:582
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1899
bool isInvalidType() const
Definition: DeclSpec.h:2697
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:916
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums.
Definition: Type.h:5117
This represents one expression.
Definition: Expr.h:110
bool isGLValue() const
Definition: Expr.h:274
bool isTypeDependent() const
Determines whether the type of this expression depends on.
Definition: Expr.h:186
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:3034
bool isPRValue() const
Definition: Expr.h:272
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language.
Definition: Expr.h:271
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:438
bool isIntegerConstantExpr(const ASTContext &Ctx, SourceLocation *Loc=nullptr) const
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:266
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:463
QualType getType() const
Definition: Expr.h:142
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:421
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
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
Represents a function declaration or definition.
Definition: Decl.h:1959
Represents a prototype with parameter type info, e.g.
Definition: Type.h:4198
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3798
static StringRef getNameForCallConv(CallingConv CC)
Definition: Type.cpp:3417
CallingConv getCallConv() const
Definition: Type.h:4126
QualType getReturnType() const
Definition: Type.h:4115
One of these records is kept for each identifier that is lexed.
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
bool isKeyword(const LangOptions &LangOpts) const
Return true if this token is a keyword in the specified language.
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat, FPOptionsOverride FPO)
Definition: Expr.cpp:2049
Describes the kind of initialization being performed, along with location information for tokens rela...
static InitializationKind CreateCast(SourceRange TypeRange)
Create a direct initialization due to a cast that isn't a C-style or functional cast.
static InitializationKind CreateFunctionalCast(SourceRange TypeRange, bool InitList)
Create a direct initialization for a functional cast.
static InitializationKind CreateCStyleCast(SourceLocation StartLoc, SourceRange TypeRange, bool InitList)
Create a direct initialization for a C-style cast.
Describes the sequence of initializations required to initialize a given object or reference with a s...
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:8538
FailureKind getFailureKind() const
Determine why initialization failed.
OverloadingResult getFailedOverloadResult() const
Get the overloading result, for when the initialization sequence failed due to a bad overload.
bool Failed() const
Determine whether the initialization sequence is invalid.
@ FK_UserConversionOverloadFailed
Overloading for a user-defined conversion failed.
@ FK_ConstructorOverloadFailed
Overloading for initialization by constructor failed.
@ FK_ParenthesizedListInitFailed
Parenthesized list initialization failed at some point.
bool isConstructorInitialization() const
Determine whether this initialization is direct call to a constructor.
Definition: SemaInit.cpp:3724
OverloadCandidateSet & getFailedCandidateSet()
Retrieve a reference to the candidate set when overload resolution fails.
Describes an entity that is being initialized.
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
Represents a matrix type, as defined in the Matrix Types clang extensions.
Definition: Type.h:3673
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:3088
QualType getPointeeType() const
Definition: Type.h:3104
bool isMemberFunctionPointer() const
Returns true if the member type (i.e.
Definition: Type.h:3108
const Type * getClass() const
Definition: Type.h:3118
SourceRange getSourceRange() const LLVM_READONLY
Retrieve the source range covering the entirety of this nested-name-specifier.
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13....
Definition: Overload.h:977
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...
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr.
Definition: ExprCXX.h:2966
static FindResult find(Expr *E)
Finds the overloaded expression in the given expression E of OverloadTy.
Definition: ExprCXX.h:3026
NestedNameSpecifierLoc getQualifierLoc() const
Fetches the nested-name qualifier with source-location information, if one was given.
Definition: ExprCXX.h:3087
DeclarationName getName() const
Gets the name looked up.
Definition: ExprCXX.h:3075
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2897
QualType getPointeeType() const
Definition: Type.h:2907
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:128
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
StringRef getLastMacroWithSpelling(SourceLocation Loc, ArrayRef< TokenValue > Tokens) const
Return the name of the macro defined before Loc that has spelling Tokens.
A (possibly-)qualified type.
Definition: Type.h:737
bool isTriviallyCopyableType(const ASTContext &Context) const
Return true if this is a trivially copyable type (C++0x [basic.types]p9)
Definition: Type.cpp:2665
QualType getNonLValueExprType(const ASTContext &Context) const
Determine the type of a (typically non-lvalue) expression with the specified result type.
Definition: Type.cpp:3401
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:7082
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:804
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6901
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:7026
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6941
bool isAddressSpaceOverlapping(QualType T) const
Returns true if address space qualifiers overlap with T address space qualifiers.
Definition: Type.h:1208
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:7101
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6994
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:971
unsigned getCVRQualifiers() const
Retrieve the set of CVR (const-volatile-restrict) qualifiers applied to this type.
Definition: Type.h:6947
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:1124
The collection of all-type qualifiers we support.
Definition: Type.h:147
unsigned getCVRQualifiers() const
Definition: Type.h:295
void removeObjCLifetime()
Definition: Type.h:358
bool hasConst() const
Definition: Type.h:264
void removeObjCGCAttr()
Definition: Type.h:330
void removeConst()
Definition: Type.h:266
static Qualifiers fromCVRMask(unsigned CVR)
Definition: Type.h:240
static bool isAddressSpaceSupersetOf(LangAS A, LangAS B)
Returns true if address space A is equal to or a superset of B.
Definition: Type.h:495
bool hasVolatile() const
Definition: Type.h:274
bool compatiblyIncludes(Qualifiers other) const
Determines if these qualifiers compatibly include another set.
Definition: Type.h:532
bool compatiblyIncludesObjCLifetime(Qualifiers other) const
Determines if these qualifiers compatibly include another set of qualifiers from the narrow perspecti...
Definition: Type.h:553
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:3070
Represents a struct/union/class.
Definition: Decl.h:4133
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:4324
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:5091
RecordDecl * getDecl() const
Definition: Type.h:5101
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:3008
QualType getPointeeType() const
Definition: Type.h:3026
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:425
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID, bool DeferHint=false)
Emit a diagnostic.
Definition: Sema.cpp:1924
ReferenceCompareResult
ReferenceCompareResult - Expresses the result of comparing two types (cv1 T1 and cv2 T2) to determine...
Definition: Sema.h:13207
@ Ref_Incompatible
Ref_Incompatible - The two types are incompatible, so direct reference binding is not possible.
Definition: Sema.h:13210
@ Ref_Compatible
Ref_Compatible - The two types are reference-compatible.
Definition: Sema.h:13216
@ AR_dependent
Definition: Sema.h:8174
@ AR_accessible
Definition: Sema.h:8172
@ AR_inaccessible
Definition: Sema.h:8173
@ AR_delayed
Definition: Sema.h:8175
ExprResult BuildCXXFunctionalCastExpr(TypeSourceInfo *TInfo, QualType Type, SourceLocation LParenLoc, Expr *CastExpr, SourceLocation RParenLoc)
Definition: SemaCast.cpp:3357
ExprResult BuildBuiltinBitCastExpr(SourceLocation KWLoc, TypeSourceInfo *TSI, Expr *Operand, SourceLocation RParenLoc)
Definition: SemaCast.cpp:399
FPOptionsOverride CurFPFeatureOverrides()
Definition: Sema.h:773
ASTContext & Context
Definition: Sema.h:476
bool ShouldSplatAltivecScalarInCast(const VectorType *VecTy)
Definition: SemaCast.cpp:2682
@ ACR_unbridged
Definition: Sema.h:13285
ExprResult ActOnBuiltinBitCastExpr(SourceLocation KWLoc, Declarator &Dcl, ExprResult Operand, SourceLocation RParenLoc)
Definition: SemaCast.cpp:387
const LangOptions & getLangOpts() const
Definition: Sema.h:1794
void CheckExtraCXXDefaultArguments(Declarator &D)
CheckExtraCXXDefaultArguments - Check for any extra default arguments in the declarator,...
ExprResult BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty, SourceLocation RParenLoc, Expr *Op)
Definition: SemaCast.cpp:3331
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:278
CheckedConversionKind
The kind of conversion being performed.
Definition: Sema.h:12755
@ CCK_OtherCast
A cast other than a C-style cast.
Definition: Sema.h:12763
@ CCK_CStyleCast
A C-style cast.
Definition: Sema.h:12759
@ CCK_FunctionalCast
A functional-style cast.
Definition: Sema.h:12761
@ AA_Casting
Definition: Sema.h:3896
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...
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType, bool IsDereference, SourceRange Range)
Definition: SemaCast.cpp:2034
TypeSourceInfo * GetTypeForDeclaratorCast(Declarator &D, QualType FromTy)
Definition: SemaType.cpp:6209
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:24
DiagnosticsEngine & Diags
Definition: Sema.h:478
ExprResult BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind, TypeSourceInfo *Ty, Expr *E, SourceRange AngleBrackets, SourceRange Parens)
Definition: SemaCast.cpp:301
bool CheckAltivecInitFromScalar(SourceRange R, QualType VecTy, QualType SrcTy)
Definition: SemaCast.cpp:2695
Encodes a location in the source.
bool isValid() const
Return true if this is a valid SourceLocation object.
A trivial tuple used to represent a source range.
SourceLocation getBegin() const
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:350
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:326
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:338
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3652
bool isUnion() const
Definition: Decl.h:3755
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:89
Base wrapper for a particular "section" of type source info.
Definition: TypeLoc.h:59
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:153
SourceLocation getEndLoc() const
Get the end source location.
Definition: TypeLoc.cpp:235
SourceLocation getBeginLoc() const
Get the begin source location.
Definition: TypeLoc.cpp:192
A container of type source information.
Definition: Type.h:6872
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:256
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6883
The base class of the type hierarchy.
Definition: Type.h:1606
bool isIncompleteOrObjectType() const
Return true if this is an incomplete or object type, in other words, not a function type.
Definition: Type.h:2170
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1819
bool isBlockPointerType() const
Definition: Type.h:7161
bool isVoidType() const
Definition: Type.h:7442
bool isBooleanType() const
Definition: Type.h:7562
bool isFunctionReferenceType() const
Definition: Type.h:7194
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:7418
bool isSignedIntegerType() const
Return true if this is an integer type that is signed, according to C99 6.2.5p4 [char,...
Definition: Type.cpp:2083
bool isComplexType() const
isComplexType() does not include complex integers (a GCC extension).
Definition: Type.cpp:627
bool isRValueReferenceType() const
Definition: Type.h:7173
bool isVoidPointerType() const
Definition: Type.cpp:615
bool isArrayType() const
Definition: Type.h:7219
bool isFunctionPointerType() const
Definition: Type.h:7187
bool isArithmeticType() const
Definition: Type.cpp:2218
bool isPointerType() const
Definition: Type.h:7153
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:7474
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7719
bool isReferenceType() const
Definition: Type.h:7165
bool isEnumeralType() const
Definition: Type.h:7247
bool isScalarType() const
Definition: Type.h:7533
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:1804
bool isSizelessBuiltinType() const
Definition: Type.cpp:2370
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1995
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:651
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:7549
bool isExtVectorType() const
Definition: Type.h:7259
bool isAnyCharacterType() const
Determine whether this type is any of the built-in character types.
Definition: Type.cpp:2062
bool isLValueReferenceType() const
Definition: Type.h:7169
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2419
bool isFixedPointType() const
Return true if this is a fixed point type according to ISO/IEC JTC1 SC22 WG14 N1169.
Definition: Type.h:7487
bool isHalfType() const
Definition: Type.h:7446
const BuiltinType * getAsPlaceholderType() const
Definition: Type.h:7424
bool isWebAssemblyTableType() const
Returns true if this is a WebAssembly table type: either an array of reference types,...
Definition: Type.cpp:2393
bool containsErrors() const
Whether this type is an error type.
Definition: Type.h:2413
bool isMemberPointerType() const
Definition: Type.h:7201
bool isMatrixType() const
Definition: Type.h:7269
bool isComplexIntegerType() const
Definition: Type.cpp:633
bool isObjCObjectType() const
Definition: Type.h:7285
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:4776
bool isEventT() const
Definition: Type.h:7350
bool isFunctionType() const
Definition: Type.h:7149
bool isObjCObjectPointerType() const
Definition: Type.h:7281
bool isMemberFunctionPointerType() const
Definition: Type.h:7205
bool isVectorType() const
Definition: Type.h:7255
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2203
bool isFloatingType() const
Definition: Type.cpp:2186
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:2133
bool isAnyPointerType() const
Definition: Type.h:7157
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:7652
bool isNullPtrType() const
Definition: Type.h:7467
bool isRecordType() const
Definition: Type.h:7243
bool isFunctionNoProtoType() const
Definition: Type.h:2261
RecordDecl * getAsRecordDecl() const
Retrieves the RecordDecl this type refers to.
Definition: Type.cpp:1823
Represents a GCC generic vector type.
Definition: Type.h:3511
VectorKind getVectorKind() const
Definition: Type.h:3531
Defines the clang::TargetInfo interface.
const internal::VariadicDynCastAllOfMatcher< Stmt, CastExpr > castExpr
Matches any cast nodes of Clang's AST.
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
The JSON file list parser is used to communicate input to InstallAPI.
@ Self
'self' clause, allowed on Compute and Combined Constructs, plus 'update'.
@ CPlusPlus
Definition: LangStandard.h:54
@ OR_Deleted
Succeeded, but refers to a deleted function.
Definition: Overload.h:61
@ OR_Success
Overload resolution succeeded.
Definition: Overload.h:52
@ OR_Ambiguous
Ambiguous candidates found.
Definition: Overload.h:58
@ OR_No_Viable_Function
No viable function found.
Definition: Overload.h:55
OverloadCandidateDisplayKind
Definition: Overload.h:64
@ OCD_AmbiguousCandidates
Requests that only tied-for-best candidates be shown.
Definition: Overload.h:73
@ OCD_ViableCandidates
Requests that only viable candidates be shown.
Definition: Overload.h:70
@ OCD_AllCandidates
Requests that all candidates be shown.
Definition: Overload.h:67
@ OK_VectorComponent
A vector component is an element or range of elements on a vector.
Definition: Specifiers.h:154
@ 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:158
@ OK_ObjCSubscript
An Objective-C array/dictionary subscripting which reads an object or writes at the subscripted array...
Definition: Specifiers.h:163
@ OK_Ordinary
An ordinary object is located at an address in memory.
Definition: Specifiers.h:148
@ OK_BitField
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:151
@ OK_MatrixComponent
A matrix component is a single element of a matrix.
Definition: Specifiers.h:166
@ Result
The result type of a method or function.
ExprResult ExprError()
Definition: Ownership.h:264
CastKind
CastKind - The kind of operation required for a conversion.
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:129
@ VK_PRValue
A pr-value expression (in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:132
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs.
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:275
VectorKind
Definition: Type.h:3474
@ AltiVecBool
is AltiVec 'vector bool ...'
@ AltiVecVector
is AltiVec vector
@ AltiVecPixel
is AltiVec 'vector Pixel'
@ None
The alignment was not explicit in code.
@ Class
The "class" keyword introduces the elaborated-type-specifier.
@ Enum
The "enum" keyword introduces the elaborated-type-specifier.
@ Parens
New-expression has a C++98 paren-delimited initializer.
Represents an element in a path from a derived class to a base class.
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:629
ReferenceConversions
The conversions that would be performed on an lvalue of type T2 when binding a reference of type T1 t...
Definition: Sema.h:13224