SemaCast.cpp source code [clang_source_code/lib/Sema/SemaCast.cpp]

1	//===--- SemaCast.cpp - Semantic Analysis for Casts -----------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file implements semantic analysis for cast expressions, including
10	// 1) C-style casts like '(int) x'
11	// 2) C++ functional casts like 'int(x)'
12	// 3) C++ named casts like 'static_cast<int>(x)'
13	//
14	//===----------------------------------------------------------------------===//
15
16	#include "clang/Sema/SemaInternal.h"
17	#include "clang/AST/ASTContext.h"
18	#include "clang/AST/CXXInheritance.h"
19	#include "clang/AST/ExprCXX.h"
20	#include "clang/AST/ExprObjC.h"
21	#include "clang/AST/RecordLayout.h"
22	#include "clang/Basic/PartialDiagnostic.h"
23	#include "clang/Basic/TargetInfo.h"
24	#include "clang/Lex/Preprocessor.h"
25	#include "clang/Sema/Initialization.h"
26	#include "llvm/ADT/SmallVector.h"
27	#include <set>
28	using namespace clang;
29
30
31
32	enum TryCastResult {
33	TC_NotApplicable, ///< The cast method is not applicable.
34	TC_Success, ///< The cast method is appropriate and successful.
35	TC_Extension, ///< The cast method is appropriate and accepted as a
36	///< language extension.
37	TC_Failed ///< The cast method is appropriate, but failed. A
38	///< diagnostic has been emitted.
39	};
40
41	static bool isValidCast(TryCastResult TCR) {
42	return TCR == TC_Success \|\| TCR == TC_Extension;
43	}
44
45	enum CastType {
46	CT_Const, ///< const_cast
47	CT_Static, ///< static_cast
48	CT_Reinterpret, ///< reinterpret_cast
49	CT_Dynamic, ///< dynamic_cast
50	CT_CStyle, ///< (Type)expr
51	CT_Functional ///< Type(expr)
52	};
53
54	namespace {
55	struct CastOperation {
56	CastOperation(Sema &S, QualType destType, ExprResult src)
57	: Self(S), SrcExpr(src), DestType(destType),
58	ResultType(destType.getNonLValueExprType(S.Context)),
59	ValueKind(Expr::getValueKindForType(destType)),
60	Kind(CK_Dependent), IsARCUnbridgedCast(false) {
61
62	if (const BuiltinType *placeholder =
63	src.get()->getType()->getAsPlaceholderType()) {
64	PlaceholderKind = placeholder->getKind();
65	} else {
66	PlaceholderKind = (BuiltinType::Kind) 0;
67	}
68	}
69
70	Sema &Self;
71	ExprResult SrcExpr;
72	QualType DestType;
73	QualType ResultType;
74	ExprValueKind ValueKind;
75	CastKind Kind;
76	BuiltinType::Kind PlaceholderKind;
77	CXXCastPath BasePath;
78	bool IsARCUnbridgedCast;
79
80	SourceRange OpRange;
81	SourceRange DestRange;
82
83	// Top-level semantics-checking routines.
84	void CheckConstCast();
85	void CheckReinterpretCast();
86	void CheckStaticCast();
87	void CheckDynamicCast();
88	void CheckCXXCStyleCast(bool FunctionalCast, bool ListInitialization);
89	void CheckCStyleCast();
90
91	void updatePartOfExplicitCastFlags(CastExpr *CE) {
92	// Walk down from the CE to the OrigSrcExpr, and mark all immediate
93	// ImplicitCastExpr's as being part of ExplicitCastExpr. The original CE
94	// (which is a ExplicitCastExpr), and the OrigSrcExpr are not touched.
95	for (; auto *ICE = dyn_cast<ImplicitCastExpr>(CE->getSubExpr()); CE = ICE)
96	ICE->setIsPartOfExplicitCast(true);
97	}
98
99	/// Complete an apparently-successful cast operation that yields
100	/// the given expression.
101	ExprResult complete(CastExpr *castExpr) {
102	// If this is an unbridged cast, wrap the result in an implicit
103	// cast that yields the unbridged-cast placeholder type.
104	if (IsARCUnbridgedCast) {
105	castExpr = ImplicitCastExpr::Create(Self.Context,
106	Self.Context.ARCUnbridgedCastTy,
107	CK_Dependent, castExpr, nullptr,
108	castExpr->getValueKind());
109	}
110	updatePartOfExplicitCastFlags(castExpr);
111	return castExpr;
112	}
113
114	// Internal convenience methods.
115
116	/// Try to handle the given placeholder expression kind. Return
117	/// true if the source expression has the appropriate placeholder
118	/// kind. A placeholder can only be claimed once.
119	bool claimPlaceholder(BuiltinType::Kind K) {
120	if (PlaceholderKind != K) return false;
121
122	PlaceholderKind = (BuiltinType::Kind) 0;
123	return true;
124	}
125
126	bool isPlaceholder() const {
127	return PlaceholderKind != 0;
128	}
129	bool isPlaceholder(BuiltinType::Kind K) const {
130	return PlaceholderKind == K;
131	}
132
133	// Language specific cast restrictions for address spaces.
134	void checkAddressSpaceCast(QualType SrcType, QualType DestType);
135
136	void checkCastAlign() {
137	Self.CheckCastAlign(SrcExpr.get(), DestType, OpRange);
138	}
139
140	void checkObjCConversion(Sema::CheckedConversionKind CCK) {
141	assert(Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers());
142
143	Expr *src = SrcExpr.get();
144	if (Self.CheckObjCConversion(OpRange, DestType, src, CCK) ==
145	Sema::ACR_unbridged)
146	IsARCUnbridgedCast = true;
147	SrcExpr = src;
148	}
149
150	/// Check for and handle non-overload placeholder expressions.
151	void checkNonOverloadPlaceholders() {
152	if (!isPlaceholder() \|\| isPlaceholder(BuiltinType::Overload))
153	return;
154
155	SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
156	if (SrcExpr.isInvalid())
157	return;
158	PlaceholderKind = (BuiltinType::Kind) 0;
159	}
160	};
161	}
162
163	static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
164	QualType DestType);
165
166	// The Try functions attempt a specific way of casting. If they succeed, they
167	// return TC_Success. If their way of casting is not appropriate for the given
168	// arguments, they return TC_NotApplicable and may set diag to a diagnostic
169	// to emit if no other way succeeds. If their way of casting is appropriate but
170	// fails, they return TC_Failed and must set diag; they can set it to 0 if
171	// they emit a specialized diagnostic.
172	// All diagnostics returned by these functions must expect the same three
173	// arguments:
174	// %0: Cast Type (a value from the CastType enumeration)
175	// %1: Source Type
176	// %2: Destination Type
177	static TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr,
178	QualType DestType, bool CStyle,
179	CastKind &Kind,
180	CXXCastPath &BasePath,
181	unsigned &msg);
182	static TryCastResult TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr,
183	QualType DestType, bool CStyle,
184	SourceRange OpRange,
185	unsigned &msg,
186	CastKind &Kind,
187	CXXCastPath &BasePath);
188	static TryCastResult TryStaticPointerDowncast(Sema &Self, QualType SrcType,
189	QualType DestType, bool CStyle,
190	SourceRange OpRange,
191	unsigned &msg,
192	CastKind &Kind,
193	CXXCastPath &BasePath);
194	static TryCastResult TryStaticDowncast(Sema &Self, CanQualType SrcType,
195	CanQualType DestType, bool CStyle,
196	SourceRange OpRange,
197	QualType OrigSrcType,
198	QualType OrigDestType, unsigned &msg,
199	CastKind &Kind,
200	CXXCastPath &BasePath);
201	static TryCastResult TryStaticMemberPointerUpcast(Sema &Self, ExprResult &SrcExpr,
202	QualType SrcType,
203	QualType DestType,bool CStyle,
204	SourceRange OpRange,
205	unsigned &msg,
206	CastKind &Kind,
207	CXXCastPath &BasePath);
208
209	static TryCastResult TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr,
210	QualType DestType,
211	Sema::CheckedConversionKind CCK,
212	SourceRange OpRange,
213	unsigned &msg, CastKind &Kind,
214	bool ListInitialization);
215	static TryCastResult TryStaticCast(Sema &Self, ExprResult &SrcExpr,
216	QualType DestType,
217	Sema::CheckedConversionKind CCK,
218	SourceRange OpRange,
219	unsigned &msg, CastKind &Kind,
220	CXXCastPath &BasePath,
221	bool ListInitialization);
222	static TryCastResult TryConstCast(Sema &Self, ExprResult &SrcExpr,
223	QualType DestType, bool CStyle,
224	unsigned &msg);
225	static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
226	QualType DestType, bool CStyle,
227	SourceRange OpRange,
228	unsigned &msg,
229	CastKind &Kind);
230
231
232	/// ActOnCXXNamedCast - Parse {dynamic,static,reinterpret,const}_cast's.
233	ExprResult
234	Sema::ActOnCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
235	SourceLocation LAngleBracketLoc, Declarator &D,
236	SourceLocation RAngleBracketLoc,
237	SourceLocation LParenLoc, Expr *E,
238	SourceLocation RParenLoc) {
239
240	assert(!D.isInvalidType());
241
242	TypeSourceInfo *TInfo = GetTypeForDeclaratorCast(D, E->getType());
243	if (D.isInvalidType())
244	return ExprError();
245
246	if (getLangOpts().CPlusPlus) {
247	// Check that there are no default arguments (C++ only).
248	CheckExtraCXXDefaultArguments(D);
249	}
250
251	return BuildCXXNamedCast(OpLoc, Kind, TInfo, E,
252	SourceRange(LAngleBracketLoc, RAngleBracketLoc),
253	SourceRange(LParenLoc, RParenLoc));
254	}
255
256	ExprResult
257	Sema::BuildCXXNamedCast(SourceLocation OpLoc, tok::TokenKind Kind,
258	TypeSourceInfo DestTInfo, Expr E,
259	SourceRange AngleBrackets, SourceRange Parens) {
260	ExprResult Ex = E;
261	QualType DestType = DestTInfo->getType();
262
263	// If the type is dependent, we won't do the semantic analysis now.
264	bool TypeDependent =
265	DestType->isDependentType() \|\| Ex.get()->isTypeDependent();
266
267	CastOperation Op(*this, DestType, E);
268	Op.OpRange = SourceRange(OpLoc, Parens.getEnd());
269	Op.DestRange = AngleBrackets;
270
271	switch (Kind) {
272	default: llvm_unreachable("Unknown C++ cast!");
273
274	case tok::kw_const_cast:
275	if (!TypeDependent) {
276	Op.CheckConstCast();
277	if (Op.SrcExpr.isInvalid())
278	return ExprError();
279	DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
280	}
281	return Op.complete(CXXConstCastExpr::Create(Context, Op.ResultType,
282	Op.ValueKind, Op.SrcExpr.get(), DestTInfo,
283	OpLoc, Parens.getEnd(),
284	AngleBrackets));
285
286	case tok::kw_dynamic_cast: {
287	// OpenCL C++ 1.0 s2.9: dynamic_cast is not supported.
288	if (getLangOpts().OpenCLCPlusPlus) {
289	return ExprError(Diag(OpLoc, diag::err_openclcxx_not_supported)
290	<< "dynamic_cast");
291	}
292
293	if (!TypeDependent) {
294	Op.CheckDynamicCast();
295	if (Op.SrcExpr.isInvalid())
296	return ExprError();
297	}
298	return Op.complete(CXXDynamicCastExpr::Create(Context, Op.ResultType,
299	Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
300	&Op.BasePath, DestTInfo,
301	OpLoc, Parens.getEnd(),
302	AngleBrackets));
303	}
304	case tok::kw_reinterpret_cast: {
305	if (!TypeDependent) {
306	Op.CheckReinterpretCast();
307	if (Op.SrcExpr.isInvalid())
308	return ExprError();
309	DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
310	}
311	return Op.complete(CXXReinterpretCastExpr::Create(Context, Op.ResultType,
312	Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
313	nullptr, DestTInfo, OpLoc,
314	Parens.getEnd(),
315	AngleBrackets));
316	}
317	case tok::kw_static_cast: {
318	if (!TypeDependent) {
319	Op.CheckStaticCast();
320	if (Op.SrcExpr.isInvalid())
321	return ExprError();
322	DiscardMisalignedMemberAddress(DestType.getTypePtr(), E);
323	}
324
325	return Op.complete(CXXStaticCastExpr::Create(Context, Op.ResultType,
326	Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
327	&Op.BasePath, DestTInfo,
328	OpLoc, Parens.getEnd(),
329	AngleBrackets));
330	}
331	}
332	}
333
334	/// Try to diagnose a failed overloaded cast. Returns true if
335	/// diagnostics were emitted.
336	static bool tryDiagnoseOverloadedCast(Sema &S, CastType CT,
337	SourceRange range, Expr *src,
338	QualType destType,
339	bool listInitialization) {
340	switch (CT) {
341	// These cast kinds don't consider user-defined conversions.
342	case CT_Const:
343	case CT_Reinterpret:
344	case CT_Dynamic:
345	return false;
346
347	// These do.
348	case CT_Static:
349	case CT_CStyle:
350	case CT_Functional:
351	break;
352	}
353
354	QualType srcType = src->getType();
355	if (!destType->isRecordType() && !srcType->isRecordType())
356	return false;
357
358	InitializedEntity entity = InitializedEntity::InitializeTemporary(destType);
359	InitializationKind initKind
360	= (CT == CT_CStyle)? InitializationKind::CreateCStyleCast(range.getBegin(),
361	range, listInitialization)
362	: (CT == CT_Functional)? InitializationKind::CreateFunctionalCast(range,
363	listInitialization)
364	: InitializationKind::CreateCast(/type range?/ range);
365	InitializationSequence sequence(S, entity, initKind, src);
366
367	(0) . __assert_fail ("sequence.Failed() && \"initialization succeeded on second try?\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 367, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(sequence.Failed() && "initialization succeeded on second try?");
368	switch (sequence.getFailureKind()) {
369	default: return false;
370
371	case InitializationSequence::FK_ConstructorOverloadFailed:
372	case InitializationSequence::FK_UserConversionOverloadFailed:
373	break;
374	}
375
376	OverloadCandidateSet &candidates = sequence.getFailedCandidateSet();
377
378	unsigned msg = 0;
379	OverloadCandidateDisplayKind howManyCandidates = OCD_AllCandidates;
380
381	switch (sequence.getFailedOverloadResult()) {
382	case OR_Success: llvm_unreachable("successful failed overload");
383	case OR_No_Viable_Function:
384	if (candidates.empty())
385	msg = diag::err_ovl_no_conversion_in_cast;
386	else
387	msg = diag::err_ovl_no_viable_conversion_in_cast;
388	howManyCandidates = OCD_AllCandidates;
389	break;
390
391	case OR_Ambiguous:
392	msg = diag::err_ovl_ambiguous_conversion_in_cast;
393	howManyCandidates = OCD_ViableCandidates;
394	break;
395
396	case OR_Deleted:
397	msg = diag::err_ovl_deleted_conversion_in_cast;
398	howManyCandidates = OCD_ViableCandidates;
399	break;
400	}
401
402	S.Diag(range.getBegin(), msg)
403	<< CT << srcType << destType
404	<< range << src->getSourceRange();
405
406	candidates.NoteCandidates(S, howManyCandidates, src);
407
408	return true;
409	}
410
411	/// Diagnose a failed cast.
412	static void diagnoseBadCast(Sema &S, unsigned msg, CastType castType,
413	SourceRange opRange, Expr *src, QualType destType,
414	bool listInitialization) {
415	if (msg == diag::err_bad_cxx_cast_generic &&
416	tryDiagnoseOverloadedCast(S, castType, opRange, src, destType,
417	listInitialization))
418	return;
419
420	S.Diag(opRange.getBegin(), msg) << castType
421	<< src->getType() << destType << opRange << src->getSourceRange();
422
423	// Detect if both types are (ptr to) class, and note any incompleteness.
424	int DifferentPtrness = 0;
425	QualType From = destType;
426	if (auto Ptr = From->getAs<PointerType>()) {
427	From = Ptr->getPointeeType();
428	DifferentPtrness++;
429	}
430	QualType To = src->getType();
431	if (auto Ptr = To->getAs<PointerType>()) {
432	To = Ptr->getPointeeType();
433	DifferentPtrness--;
434	}
435	if (!DifferentPtrness) {
436	auto RecFrom = From->getAs<RecordType>();
437	auto RecTo = To->getAs<RecordType>();
438	if (RecFrom && RecTo) {
439	auto DeclFrom = RecFrom->getAsCXXRecordDecl();
440	if (!DeclFrom->isCompleteDefinition())
441	S.Diag(DeclFrom->getLocation(), diag::note_type_incomplete)
442	<< DeclFrom->getDeclName();
443	auto DeclTo = RecTo->getAsCXXRecordDecl();
444	if (!DeclTo->isCompleteDefinition())
445	S.Diag(DeclTo->getLocation(), diag::note_type_incomplete)
446	<< DeclTo->getDeclName();
447	}
448	}
449	}
450
451	namespace {
452	/// The kind of unwrapping we did when determining whether a conversion casts
453	/// away constness.
454	enum CastAwayConstnessKind {
455	/// The conversion does not cast away constness.
456	CACK_None = 0,
457	/// We unwrapped similar types.
458	CACK_Similar = 1,
459	/// We unwrapped dissimilar types with similar representations (eg, a pointer
460	/// versus an Objective-C object pointer).
461	CACK_SimilarKind = 2,
462	/// We unwrapped representationally-unrelated types, such as a pointer versus
463	/// a pointer-to-member.
464	CACK_Incoherent = 3,
465	};
466	}
467
468	/// Unwrap one level of types for CastsAwayConstness.
469	///
470	/// Like Sema::UnwrapSimilarTypes, this removes one level of indirection from
471	/// both types, provided that they're both pointer-like or array-like. Unlike
472	/// the Sema function, doesn't care if the unwrapped pieces are related.
473	///
474	/// This function may remove additional levels as necessary for correctness:
475	/// the resulting T1 is unwrapped sufficiently that it is never an array type,
476	/// so that its qualifiers can be directly compared to those of T2 (which will
477	/// have the combined set of qualifiers from all indermediate levels of T2),
478	/// as (effectively) required by [expr.const.cast]p7 replacing T1's qualifiers
479	/// with those from T2.
480	static CastAwayConstnessKind
481	unwrapCastAwayConstnessLevel(ASTContext &Context, QualType &T1, QualType &T2) {
482	enum { None, Ptr, MemPtr, BlockPtr, Array };
483	auto Classify = [](QualType T) {
484	if (T->isAnyPointerType()) return Ptr;
485	if (T->isMemberPointerType()) return MemPtr;
486	if (T->isBlockPointerType()) return BlockPtr;
487	// We somewhat-arbitrarily don't look through VLA types here. This is at
488	// least consistent with the behavior of UnwrapSimilarTypes.
489	if (T->isConstantArrayType() \|\| T->isIncompleteArrayType()) return Array;
490	return None;
491	};
492
493	auto Unwrap = [&](QualType T) {
494	if (auto *AT = Context.getAsArrayType(T))
495	return AT->getElementType();
496	return T->getPointeeType();
497	};
498
499	CastAwayConstnessKind Kind;
500
501	if (T2->isReferenceType()) {
502	// Special case: if the destination type is a reference type, unwrap it as
503	// the first level. (The source will have been an lvalue expression in this
504	// case, so there is no corresponding "reference to" in T1 to remove.) This
505	// simulates removing a "pointer to" from both sides.
506	T2 = T2->getPointeeType();
507	Kind = CastAwayConstnessKind::CACK_Similar;
508	} else if (Context.UnwrapSimilarTypes(T1, T2)) {
509	Kind = CastAwayConstnessKind::CACK_Similar;
510	} else {
511	// Try unwrapping mismatching levels.
512	int T1Class = Classify(T1);
513	if (T1Class == None)
514	return CastAwayConstnessKind::CACK_None;
515
516	int T2Class = Classify(T2);
517	if (T2Class == None)
518	return CastAwayConstnessKind::CACK_None;
519
520	T1 = Unwrap(T1);
521	T2 = Unwrap(T2);
522	Kind = T1Class == T2Class ? CastAwayConstnessKind::CACK_SimilarKind
523	: CastAwayConstnessKind::CACK_Incoherent;
524	}
525
526	// We've unwrapped at least one level. If the resulting T1 is a (possibly
527	// multidimensional) array type, any qualifier on any matching layer of
528	// T2 is considered to correspond to T1. Decompose down to the element
529	// type of T1 so that we can compare properly.
530	while (true) {
531	Context.UnwrapSimilarArrayTypes(T1, T2);
532
533	if (Classify(T1) != Array)
534	break;
535
536	auto T2Class = Classify(T2);
537	if (T2Class == None)
538	break;
539
540	if (T2Class != Array)
541	Kind = CastAwayConstnessKind::CACK_Incoherent;
542	else if (Kind != CastAwayConstnessKind::CACK_Incoherent)
543	Kind = CastAwayConstnessKind::CACK_SimilarKind;
544
545	T1 = Unwrap(T1);
546	T2 = Unwrap(T2).withCVRQualifiers(T2.getCVRQualifiers());
547	}
548
549	return Kind;
550	}
551
552	/// Check if the pointer conversion from SrcType to DestType casts away
553	/// constness as defined in C++ [expr.const.cast]. This is used by the cast
554	/// checkers. Both arguments must denote pointer (possibly to member) types.
555	///
556	/// \param CheckCVR Whether to check for const/volatile/restrict qualifiers.
557	/// \param CheckObjCLifetime Whether to check Objective-C lifetime qualifiers.
558	static CastAwayConstnessKind
559	CastsAwayConstness(Sema &Self, QualType SrcType, QualType DestType,
560	bool CheckCVR, bool CheckObjCLifetime,
561	QualType *TheOffendingSrcType = nullptr,
562	QualType *TheOffendingDestType = nullptr,
563	Qualifiers *CastAwayQualifiers = nullptr) {
564	// If the only checking we care about is for Objective-C lifetime qualifiers,
565	// and we're not in ObjC mode, there's nothing to check.
566	if (!CheckCVR && CheckObjCLifetime && !Self.Context.getLangOpts().ObjC)
567	return CastAwayConstnessKind::CACK_None;
568
569	if (!DestType->isReferenceType()) {
570	(0) . __assert_fail ("(SrcType->isAnyPointerType() \|\| SrcType->isMemberPointerType() \|\| SrcType->isBlockPointerType()) && \"Source type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 572, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((SrcType->isAnyPointerType() \|\| SrcType->isMemberPointerType() \|\|
571	(0) . __assert_fail ("(SrcType->isAnyPointerType() \|\| SrcType->isMemberPointerType() \|\| SrcType->isBlockPointerType()) && \"Source type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 572, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> SrcType->isBlockPointerType()) &&
572	(0) . __assert_fail ("(SrcType->isAnyPointerType() \|\| SrcType->isMemberPointerType() \|\| SrcType->isBlockPointerType()) && \"Source type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 572, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Source type is not pointer or pointer to member.");
573	(0) . __assert_fail ("(DestType->isAnyPointerType() \|\| DestType->isMemberPointerType() \|\| DestType->isBlockPointerType()) && \"Destination type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 575, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((DestType->isAnyPointerType() \|\| DestType->isMemberPointerType() \|\|
574	(0) . __assert_fail ("(DestType->isAnyPointerType() \|\| DestType->isMemberPointerType() \|\| DestType->isBlockPointerType()) && \"Destination type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 575, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> DestType->isBlockPointerType()) &&
575	(0) . __assert_fail ("(DestType->isAnyPointerType() \|\| DestType->isMemberPointerType() \|\| DestType->isBlockPointerType()) && \"Destination type is not pointer or pointer to member.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 575, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Destination type is not pointer or pointer to member.");
576	}
577
578	QualType UnwrappedSrcType = Self.Context.getCanonicalType(SrcType),
579	UnwrappedDestType = Self.Context.getCanonicalType(DestType);
580
581	// Find the qualifiers. We only care about cvr-qualifiers for the
582	// purpose of this check, because other qualifiers (address spaces,
583	// Objective-C GC, etc.) are part of the type's identity.
584	QualType PrevUnwrappedSrcType = UnwrappedSrcType;
585	QualType PrevUnwrappedDestType = UnwrappedDestType;
586	auto WorstKind = CastAwayConstnessKind::CACK_Similar;
587	bool AllConstSoFar = true;
588	while (auto Kind = unwrapCastAwayConstnessLevel(
589	Self.Context, UnwrappedSrcType, UnwrappedDestType)) {
590	// Track the worst kind of unwrap we needed to do before we found a
591	// problem.
592	if (Kind > WorstKind)
593	WorstKind = Kind;
594
595	// Determine the relevant qualifiers at this level.
596	Qualifiers SrcQuals, DestQuals;
597	Self.Context.getUnqualifiedArrayType(UnwrappedSrcType, SrcQuals);
598	Self.Context.getUnqualifiedArrayType(UnwrappedDestType, DestQuals);
599
600	// We do not meaningfully track object const-ness of Objective-C object
601	// types. Remove const from the source type if either the source or
602	// the destination is an Objective-C object type.
603	if (UnwrappedSrcType->isObjCObjectType() \|\|
604	UnwrappedDestType->isObjCObjectType())
605	SrcQuals.removeConst();
606
607	if (CheckCVR) {
608	Qualifiers SrcCvrQuals =
609	Qualifiers::fromCVRMask(SrcQuals.getCVRQualifiers());
610	Qualifiers DestCvrQuals =
611	Qualifiers::fromCVRMask(DestQuals.getCVRQualifiers());
612
613	if (SrcCvrQuals != DestCvrQuals) {
614	if (CastAwayQualifiers)
615	*CastAwayQualifiers = SrcCvrQuals - DestCvrQuals;
616
617	// If we removed a cvr-qualifier, this is casting away 'constness'.
618	if (!DestCvrQuals.compatiblyIncludes(SrcCvrQuals)) {
619	if (TheOffendingSrcType)
620	*TheOffendingSrcType = PrevUnwrappedSrcType;
621	if (TheOffendingDestType)
622	*TheOffendingDestType = PrevUnwrappedDestType;
623	return WorstKind;
624	}
625
626	// If any prior level was not 'const', this is also casting away
627	// 'constness'. We noted the outermost type missing a 'const' already.
628	if (!AllConstSoFar)
629	return WorstKind;
630	}
631	}
632
633	if (CheckObjCLifetime &&
634	!DestQuals.compatiblyIncludesObjCLifetime(SrcQuals))
635	return WorstKind;
636
637	// If we found our first non-const-qualified type, this may be the place
638	// where things start to go wrong.
639	if (AllConstSoFar && !DestQuals.hasConst()) {
640	AllConstSoFar = false;
641	if (TheOffendingSrcType)
642	*TheOffendingSrcType = PrevUnwrappedSrcType;
643	if (TheOffendingDestType)
644	*TheOffendingDestType = PrevUnwrappedDestType;
645	}
646
647	PrevUnwrappedSrcType = UnwrappedSrcType;
648	PrevUnwrappedDestType = UnwrappedDestType;
649	}
650
651	return CastAwayConstnessKind::CACK_None;
652	}
653
654	static TryCastResult getCastAwayConstnessCastKind(CastAwayConstnessKind CACK,
655	unsigned &DiagID) {
656	switch (CACK) {
657	case CastAwayConstnessKind::CACK_None:
658	llvm_unreachable("did not cast away constness");
659
660	case CastAwayConstnessKind::CACK_Similar:
661	// FIXME: Accept these as an extension too?
662	case CastAwayConstnessKind::CACK_SimilarKind:
663	DiagID = diag::err_bad_cxx_cast_qualifiers_away;
664	return TC_Failed;
665
666	case CastAwayConstnessKind::CACK_Incoherent:
667	DiagID = diag::ext_bad_cxx_cast_qualifiers_away_incoherent;
668	return TC_Extension;
669	}
670
671	llvm_unreachable("unexpected cast away constness kind");
672	}
673
674	/// CheckDynamicCast - Check that a dynamic_cast\<DestType\>(SrcExpr) is valid.
675	/// Refer to C++ 5.2.7 for details. Dynamic casts are used mostly for runtime-
676	/// checked downcasts in class hierarchies.
677	void CastOperation::CheckDynamicCast() {
678	if (ValueKind == VK_RValue)
679	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
680	else if (isPlaceholder())
681	SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
682	if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
683	return;
684
685	QualType OrigSrcType = SrcExpr.get()->getType();
686	QualType DestType = Self.Context.getCanonicalType(this->DestType);
687
688	// C++ 5.2.7p1: T shall be a pointer or reference to a complete class type,
689	// or "pointer to cv void".
690
691	QualType DestPointee;
692	const PointerType *DestPointer = DestType->getAs<PointerType>();
693	const ReferenceType *DestReference = nullptr;
694	if (DestPointer) {
695	DestPointee = DestPointer->getPointeeType();
696	} else if ((DestReference = DestType->getAs<ReferenceType>())) {
697	DestPointee = DestReference->getPointeeType();
698	} else {
699	Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ref_or_ptr)
700	<< this->DestType << DestRange;
701	SrcExpr = ExprError();
702	return;
703	}
704
705	const RecordType *DestRecord = DestPointee->getAs<RecordType>();
706	if (DestPointee->isVoidType()) {
707	(0) . __assert_fail ("DestPointer && \"Reference to void is not possible\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 707, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(DestPointer && "Reference to void is not possible");
708	} else if (DestRecord) {
709	if (Self.RequireCompleteType(OpRange.getBegin(), DestPointee,
710	diag::err_bad_dynamic_cast_incomplete,
711	DestRange)) {
712	SrcExpr = ExprError();
713	return;
714	}
715	} else {
716	Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
717	<< DestPointee.getUnqualifiedType() << DestRange;
718	SrcExpr = ExprError();
719	return;
720	}
721
722	// C++0x 5.2.7p2: If T is a pointer type, v shall be an rvalue of a pointer to
723	// complete class type, [...]. If T is an lvalue reference type, v shall be
724	// an lvalue of a complete class type, [...]. If T is an rvalue reference
725	// type, v shall be an expression having a complete class type, [...]
726	QualType SrcType = Self.Context.getCanonicalType(OrigSrcType);
727	QualType SrcPointee;
728	if (DestPointer) {
729	if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
730	SrcPointee = SrcPointer->getPointeeType();
731	} else {
732	Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_ptr)
733	<< OrigSrcType << SrcExpr.get()->getSourceRange();
734	SrcExpr = ExprError();
735	return;
736	}
737	} else if (DestReference->isLValueReferenceType()) {
738	if (!SrcExpr.get()->isLValue()) {
739	Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
740	<< CT_Dynamic << OrigSrcType << this->DestType << OpRange;
741	}
742	SrcPointee = SrcType;
743	} else {
744	// If we're dynamic_casting from a prvalue to an rvalue reference, we need
745	// to materialize the prvalue before we bind the reference to it.
746	if (SrcExpr.get()->isRValue())
747	SrcExpr = Self.CreateMaterializeTemporaryExpr(
748	SrcType, SrcExpr.get(), /IsLValueReference/ false);
749	SrcPointee = SrcType;
750	}
751
752	const RecordType *SrcRecord = SrcPointee->getAs<RecordType>();
753	if (SrcRecord) {
754	if (Self.RequireCompleteType(OpRange.getBegin(), SrcPointee,
755	diag::err_bad_dynamic_cast_incomplete,
756	SrcExpr.get())) {
757	SrcExpr = ExprError();
758	return;
759	}
760	} else {
761	Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_class)
762	<< SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
763	SrcExpr = ExprError();
764	return;
765	}
766
767	(0) . __assert_fail ("(DestPointer \|\| DestReference) && \"Bad destination non-ptr/ref slipped through.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 768, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((DestPointer \|\| DestReference) &&
768	(0) . __assert_fail ("(DestPointer \|\| DestReference) && \"Bad destination non-ptr/ref slipped through.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 768, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Bad destination non-ptr/ref slipped through.");
769	(0) . __assert_fail ("(DestRecord \|\| DestPointee->isVoidType()) && \"Bad destination pointee slipped through.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 770, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((DestRecord \|\| DestPointee->isVoidType()) &&
770	(0) . __assert_fail ("(DestRecord \|\| DestPointee->isVoidType()) && \"Bad destination pointee slipped through.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 770, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Bad destination pointee slipped through.");
771	(0) . __assert_fail ("SrcRecord && \"Bad source pointee slipped through.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 771, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(SrcRecord && "Bad source pointee slipped through.");
772
773	// C++ 5.2.7p1: The dynamic_cast operator shall not cast away constness.
774	if (!DestPointee.isAtLeastAsQualifiedAs(SrcPointee)) {
775	Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_qualifiers_away)
776	<< CT_Dynamic << OrigSrcType << this->DestType << OpRange;
777	SrcExpr = ExprError();
778	return;
779	}
780
781	// C++ 5.2.7p3: If the type of v is the same as the required result type,
782	// [except for cv].
783	if (DestRecord == SrcRecord) {
784	Kind = CK_NoOp;
785	return;
786	}
787
788	// C++ 5.2.7p5
789	// Upcasts are resolved statically.
790	if (DestRecord &&
791	Self.IsDerivedFrom(OpRange.getBegin(), SrcPointee, DestPointee)) {
792	if (Self.CheckDerivedToBaseConversion(SrcPointee, DestPointee,
793	OpRange.getBegin(), OpRange,
794	&BasePath)) {
795	SrcExpr = ExprError();
796	return;
797	}
798
799	Kind = CK_DerivedToBase;
800	return;
801	}
802
803	// C++ 5.2.7p6: Otherwise, v shall be [polymorphic].
804	const RecordDecl *SrcDecl = SrcRecord->getDecl()->getDefinition();
805	(0) . __assert_fail ("SrcDecl && \"Definition missing\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 805, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(SrcDecl && "Definition missing");
806	if (!cast<CXXRecordDecl>(SrcDecl)->isPolymorphic()) {
807	Self.Diag(OpRange.getBegin(), diag::err_bad_dynamic_cast_not_polymorphic)
808	<< SrcPointee.getUnqualifiedType() << SrcExpr.get()->getSourceRange();
809	SrcExpr = ExprError();
810	}
811
812	// dynamic_cast is not available with -fno-rtti.
813	// As an exception, dynamic_cast to void* is available because it doesn't
814	// use RTTI.
815	if (!Self.getLangOpts().RTTI && !DestPointee->isVoidType()) {
816	Self.Diag(OpRange.getBegin(), diag::err_no_dynamic_cast_with_fno_rtti);
817	SrcExpr = ExprError();
818	return;
819	}
820
821	// Done. Everything else is run-time checks.
822	Kind = CK_Dynamic;
823	}
824
825	/// CheckConstCast - Check that a const_cast\<DestType\>(SrcExpr) is valid.
826	/// Refer to C++ 5.2.11 for details. const_cast is typically used in code
827	/// like this:
828	/// const char *str = "literal";
829	/// legacy_function(const_cast\<char*\>(str));
830	void CastOperation::CheckConstCast() {
831	if (ValueKind == VK_RValue)
832	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
833	else if (isPlaceholder())
834	SrcExpr = Self.CheckPlaceholderExpr(SrcExpr.get());
835	if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
836	return;
837
838	unsigned msg = diag::err_bad_cxx_cast_generic;
839	auto TCR = TryConstCast(Self, SrcExpr, DestType, /CStyle/ false, msg);
840	if (TCR != TC_Success && msg != 0) {
841	Self.Diag(OpRange.getBegin(), msg) << CT_Const
842	<< SrcExpr.get()->getType() << DestType << OpRange;
843	}
844	if (!isValidCast(TCR))
845	SrcExpr = ExprError();
846	}
847
848	/// Check that a reinterpret_cast\<DestType\>(SrcExpr) is not used as upcast
849	/// or downcast between respective pointers or references.
850	static void DiagnoseReinterpretUpDownCast(Sema &Self, const Expr *SrcExpr,
851	QualType DestType,
852	SourceRange OpRange) {
853	QualType SrcType = SrcExpr->getType();
854	// When casting from pointer or reference, get pointee type; use original
855	// type otherwise.
856	const CXXRecordDecl *SrcPointeeRD = SrcType->getPointeeCXXRecordDecl();
857	const CXXRecordDecl *SrcRD =
858	SrcPointeeRD ? SrcPointeeRD : SrcType->getAsCXXRecordDecl();
859
860	// Examining subobjects for records is only possible if the complete and
861	// valid definition is available. Also, template instantiation is not
862	// allowed here.
863	if (!SrcRD \|\| !SrcRD->isCompleteDefinition() \|\| SrcRD->isInvalidDecl())
864	return;
865
866	const CXXRecordDecl *DestRD = DestType->getPointeeCXXRecordDecl();
867
868	if (!DestRD \|\| !DestRD->isCompleteDefinition() \|\| DestRD->isInvalidDecl())
869	return;
870
871	enum {
872	ReinterpretUpcast,
873	ReinterpretDowncast
874	} ReinterpretKind;
875
876	CXXBasePaths BasePaths;
877
878	if (SrcRD->isDerivedFrom(DestRD, BasePaths))
879	ReinterpretKind = ReinterpretUpcast;
880	else if (DestRD->isDerivedFrom(SrcRD, BasePaths))
881	ReinterpretKind = ReinterpretDowncast;
882	else
883	return;
884
885	bool VirtualBase = true;
886	bool NonZeroOffset = false;
887	for (CXXBasePaths::const_paths_iterator I = BasePaths.begin(),
888	E = BasePaths.end();
889	I != E; ++I) {
890	const CXXBasePath &Path = *I;
891	CharUnits Offset = CharUnits::Zero();
892	bool IsVirtual = false;
893	for (CXXBasePath::const_iterator IElem = Path.begin(), EElem = Path.end();
894	IElem != EElem; ++IElem) {
895	IsVirtual = IElem->Base->isVirtual();
896	if (IsVirtual)
897	break;
898	const CXXRecordDecl *BaseRD = IElem->Base->getType()->getAsCXXRecordDecl();
899	(0) . __assert_fail ("BaseRD && \"Base type should be a valid unqualified class type\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 899, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(BaseRD && "Base type should be a valid unqualified class type");
900	// Don't check if any base has invalid declaration or has no definition
901	// since it has no layout info.
902	const CXXRecordDecl *Class = IElem->Class,
903	*ClassDefinition = Class->getDefinition();
904	if (Class->isInvalidDecl() \|\| !ClassDefinition \|\|
905	!ClassDefinition->isCompleteDefinition())
906	return;
907
908	const ASTRecordLayout &DerivedLayout =
909	Self.Context.getASTRecordLayout(Class);
910	Offset += DerivedLayout.getBaseClassOffset(BaseRD);
911	}
912	if (!IsVirtual) {
913	// Don't warn if any path is a non-virtually derived base at offset zero.
914	if (Offset.isZero())
915	return;
916	// Offset makes sense only for non-virtual bases.
917	else
918	NonZeroOffset = true;
919	}
920	VirtualBase = VirtualBase && IsVirtual;
921	}
922
923	(void) NonZeroOffset; // Silence set but not used warning.
924	(0) . __assert_fail ("(VirtualBase \|\| NonZeroOffset) && \"Should have returned if has non-virtual base with zero offset\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 925, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((VirtualBase \|\| NonZeroOffset) &&
925	(0) . __assert_fail ("(VirtualBase \|\| NonZeroOffset) && \"Should have returned if has non-virtual base with zero offset\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 925, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Should have returned if has non-virtual base with zero offset");
926
927	QualType BaseType =
928	ReinterpretKind == ReinterpretUpcast? DestType : SrcType;
929	QualType DerivedType =
930	ReinterpretKind == ReinterpretUpcast? SrcType : DestType;
931
932	SourceLocation BeginLoc = OpRange.getBegin();
933	Self.Diag(BeginLoc, diag::warn_reinterpret_different_from_static)
934	<< DerivedType << BaseType << !VirtualBase << int(ReinterpretKind)
935	<< OpRange;
936	Self.Diag(BeginLoc, diag::note_reinterpret_updowncast_use_static)
937	<< int(ReinterpretKind)
938	<< FixItHint::CreateReplacement(BeginLoc, "static_cast");
939	}
940
941	/// CheckReinterpretCast - Check that a reinterpret_cast\<DestType\>(SrcExpr) is
942	/// valid.
943	/// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
944	/// like this:
945	/// char bytes = reinterpret_cast\<char\>(int_ptr);
946	void CastOperation::CheckReinterpretCast() {
947	if (ValueKind == VK_RValue && !isPlaceholder(BuiltinType::Overload))
948	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
949	else
950	checkNonOverloadPlaceholders();
951	if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
952	return;
953
954	unsigned msg = diag::err_bad_cxx_cast_generic;
955	TryCastResult tcr =
956	TryReinterpretCast(Self, SrcExpr, DestType,
957	/CStyle/false, OpRange, msg, Kind);
958	if (tcr != TC_Success && msg != 0) {
959	if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
960	return;
961	if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
962	//FIXME: &f<int>; is overloaded and resolvable
963	Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_overload)
964	<< OverloadExpr::find(SrcExpr.get()).Expression->getName()
965	<< DestType << OpRange;
966	Self.NoteAllOverloadCandidates(SrcExpr.get());
967
968	} else {
969	diagnoseBadCast(Self, msg, CT_Reinterpret, OpRange, SrcExpr.get(),
970	DestType, /listInitialization=/false);
971	}
972	}
973
974	if (isValidCast(tcr)) {
975	if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
976	checkObjCConversion(Sema::CCK_OtherCast);
977	DiagnoseReinterpretUpDownCast(Self, SrcExpr.get(), DestType, OpRange);
978	} else {
979	SrcExpr = ExprError();
980	}
981	}
982
983
984	/// CheckStaticCast - Check that a static_cast\<DestType\>(SrcExpr) is valid.
985	/// Refer to C++ 5.2.9 for details. Static casts are mostly used for making
986	/// implicit conversions explicit and getting rid of data loss warnings.
987	void CastOperation::CheckStaticCast() {
988	if (isPlaceholder()) {
989	checkNonOverloadPlaceholders();
990	if (SrcExpr.isInvalid())
991	return;
992	}
993
994	// This test is outside everything else because it's the only case where
995	// a non-lvalue-reference target type does not lead to decay.
996	// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
997	if (DestType->isVoidType()) {
998	Kind = CK_ToVoid;
999
1000	if (claimPlaceholder(BuiltinType::Overload)) {
1001	Self.ResolveAndFixSingleFunctionTemplateSpecialization(SrcExpr,
1002	false, // Decay Function to ptr
1003	true, // Complain
1004	OpRange, DestType, diag::err_bad_static_cast_overload);
1005	if (SrcExpr.isInvalid())
1006	return;
1007	}
1008
1009	SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
1010	return;
1011	}
1012
1013	if (ValueKind == VK_RValue && !DestType->isRecordType() &&
1014	!isPlaceholder(BuiltinType::Overload)) {
1015	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
1016	if (SrcExpr.isInvalid()) // if conversion failed, don't report another error
1017	return;
1018	}
1019
1020	unsigned msg = diag::err_bad_cxx_cast_generic;
1021	TryCastResult tcr
1022	= TryStaticCast(Self, SrcExpr, DestType, Sema::CCK_OtherCast, OpRange, msg,
1023	Kind, BasePath, /ListInitialization=/false);
1024	if (tcr != TC_Success && msg != 0) {
1025	if (SrcExpr.isInvalid())
1026	return;
1027	if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1028	OverloadExpr* oe = OverloadExpr::find(SrcExpr.get()).Expression;
1029	Self.Diag(OpRange.getBegin(), diag::err_bad_static_cast_overload)
1030	<< oe->getName() << DestType << OpRange
1031	<< oe->getQualifierLoc().getSourceRange();
1032	Self.NoteAllOverloadCandidates(SrcExpr.get());
1033	} else {
1034	diagnoseBadCast(Self, msg, CT_Static, OpRange, SrcExpr.get(), DestType,
1035	/listInitialization=/false);
1036	}
1037	}
1038
1039	if (isValidCast(tcr)) {
1040	if (Kind == CK_BitCast)
1041	checkCastAlign();
1042	if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers())
1043	checkObjCConversion(Sema::CCK_OtherCast);
1044	} else {
1045	SrcExpr = ExprError();
1046	}
1047	}
1048
1049	static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType) {
1050	auto *SrcPtrType = SrcType->getAs<PointerType>();
1051	if (!SrcPtrType)
1052	return false;
1053	auto *DestPtrType = DestType->getAs<PointerType>();
1054	if (!DestPtrType)
1055	return false;
1056	return SrcPtrType->getPointeeType().getAddressSpace() !=
1057	DestPtrType->getPointeeType().getAddressSpace();
1058	}
1059
1060	/// TryStaticCast - Check if a static cast can be performed, and do so if
1061	/// possible. If @p CStyle, ignore access restrictions on hierarchy casting
1062	/// and casting away constness.
1063	static TryCastResult TryStaticCast(Sema &Self, ExprResult &SrcExpr,
1064	QualType DestType,
1065	Sema::CheckedConversionKind CCK,
1066	SourceRange OpRange, unsigned &msg,
1067	CastKind &Kind, CXXCastPath &BasePath,
1068	bool ListInitialization) {
1069	// Determine whether we have the semantics of a C-style cast.
1070	bool CStyle
1071	= (CCK == Sema::CCK_CStyleCast \|\| CCK == Sema::CCK_FunctionalCast);
1072
1073	// The order the tests is not entirely arbitrary. There is one conversion
1074	// that can be handled in two different ways. Given:
1075	// struct A {};
1076	// struct B : public A {
1077	// B(); B(const A&);
1078	// };
1079	// const A &a = B();
1080	// the cast static_cast<const B&>(a) could be seen as either a static
1081	// reference downcast, or an explicit invocation of the user-defined
1082	// conversion using B's conversion constructor.
1083	// DR 427 specifies that the downcast is to be applied here.
1084
1085	// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
1086	// Done outside this function.
1087
1088	TryCastResult tcr;
1089
1090	// C++ 5.2.9p5, reference downcast.
1091	// See the function for details.
1092	// DR 427 specifies that this is to be applied before paragraph 2.
1093	tcr = TryStaticReferenceDowncast(Self, SrcExpr.get(), DestType, CStyle,
1094	OpRange, msg, Kind, BasePath);
1095	if (tcr != TC_NotApplicable)
1096	return tcr;
1097
1098	// C++11 [expr.static.cast]p3:
1099	// A glvalue of type "cv1 T1" can be cast to type "rvalue reference to cv2
1100	// T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1101	tcr = TryLValueToRValueCast(Self, SrcExpr.get(), DestType, CStyle, Kind,
1102	BasePath, msg);
1103	if (tcr != TC_NotApplicable)
1104	return tcr;
1105
1106	// C++ 5.2.9p2: An expression e can be explicitly converted to a type T
1107	// [...] if the declaration "T t(e);" is well-formed, [...].
1108	tcr = TryStaticImplicitCast(Self, SrcExpr, DestType, CCK, OpRange, msg,
1109	Kind, ListInitialization);
1110	if (SrcExpr.isInvalid())
1111	return TC_Failed;
1112	if (tcr != TC_NotApplicable)
1113	return tcr;
1114
1115	// C++ 5.2.9p6: May apply the reverse of any standard conversion, except
1116	// lvalue-to-rvalue, array-to-pointer, function-to-pointer, and boolean
1117	// conversions, subject to further restrictions.
1118	// Also, C++ 5.2.9p1 forbids casting away constness, which makes reversal
1119	// of qualification conversions impossible.
1120	// In the CStyle case, the earlier attempt to const_cast should have taken
1121	// care of reverse qualification conversions.
1122
1123	QualType SrcType = Self.Context.getCanonicalType(SrcExpr.get()->getType());
1124
1125	// C++0x 5.2.9p9: A value of a scoped enumeration type can be explicitly
1126	// converted to an integral type. [...] A value of a scoped enumeration type
1127	// can also be explicitly converted to a floating-point type [...].
1128	if (const EnumType *Enum = SrcType->getAs<EnumType>()) {
1129	if (Enum->getDecl()->isScoped()) {
1130	if (DestType->isBooleanType()) {
1131	Kind = CK_IntegralToBoolean;
1132	return TC_Success;
1133	} else if (DestType->isIntegralType(Self.Context)) {
1134	Kind = CK_IntegralCast;
1135	return TC_Success;
1136	} else if (DestType->isRealFloatingType()) {
1137	Kind = CK_IntegralToFloating;
1138	return TC_Success;
1139	}
1140	}
1141	}
1142
1143	// Reverse integral promotion/conversion. All such conversions are themselves
1144	// again integral promotions or conversions and are thus already handled by
1145	// p2 (TryDirectInitialization above).
1146	// (Note: any data loss warnings should be suppressed.)
1147	// The exception is the reverse of enum->integer, i.e. integer->enum (and
1148	// enum->enum). See also C++ 5.2.9p7.
1149	// The same goes for reverse floating point promotion/conversion and
1150	// floating-integral conversions. Again, only floating->enum is relevant.
1151	if (DestType->isEnumeralType()) {
1152	if (SrcType->isIntegralOrEnumerationType()) {
1153	Kind = CK_IntegralCast;
1154	return TC_Success;
1155	} else if (SrcType->isRealFloatingType()) {
1156	Kind = CK_FloatingToIntegral;
1157	return TC_Success;
1158	}
1159	}
1160
1161	// Reverse pointer upcast. C++ 4.10p3 specifies pointer upcast.
1162	// C++ 5.2.9p8 additionally disallows a cast path through virtual inheritance.
1163	tcr = TryStaticPointerDowncast(Self, SrcType, DestType, CStyle, OpRange, msg,
1164	Kind, BasePath);
1165	if (tcr != TC_NotApplicable)
1166	return tcr;
1167
1168	// Reverse member pointer conversion. C++ 4.11 specifies member pointer
1169	// conversion. C++ 5.2.9p9 has additional information.
1170	// DR54's access restrictions apply here also.
1171	tcr = TryStaticMemberPointerUpcast(Self, SrcExpr, SrcType, DestType, CStyle,
1172	OpRange, msg, Kind, BasePath);
1173	if (tcr != TC_NotApplicable)
1174	return tcr;
1175
1176	// Reverse pointer conversion to void*. C++ 4.10.p2 specifies conversion to
1177	// void*. C++ 5.2.9p10 specifies additional restrictions, which really is
1178	// just the usual constness stuff.
1179	if (const PointerType *SrcPointer = SrcType->getAs<PointerType>()) {
1180	QualType SrcPointee = SrcPointer->getPointeeType();
1181	if (SrcPointee->isVoidType()) {
1182	if (const PointerType *DestPointer = DestType->getAs<PointerType>()) {
1183	QualType DestPointee = DestPointer->getPointeeType();
1184	if (DestPointee->isIncompleteOrObjectType()) {
1185	// This is definitely the intended conversion, but it might fail due
1186	// to a qualifier violation. Note that we permit Objective-C lifetime
1187	// and GC qualifier mismatches here.
1188	if (!CStyle) {
1189	Qualifiers DestPointeeQuals = DestPointee.getQualifiers();
1190	Qualifiers SrcPointeeQuals = SrcPointee.getQualifiers();
1191	DestPointeeQuals.removeObjCGCAttr();
1192	DestPointeeQuals.removeObjCLifetime();
1193	SrcPointeeQuals.removeObjCGCAttr();
1194	SrcPointeeQuals.removeObjCLifetime();
1195	if (DestPointeeQuals != SrcPointeeQuals &&
1196	!DestPointeeQuals.compatiblyIncludes(SrcPointeeQuals)) {
1197	msg = diag::err_bad_cxx_cast_qualifiers_away;
1198	return TC_Failed;
1199	}
1200	}
1201	Kind = IsAddressSpaceConversion(SrcType, DestType)
1202	? CK_AddressSpaceConversion
1203	: CK_BitCast;
1204	return TC_Success;
1205	}
1206
1207	// Microsoft permits static_cast from 'pointer-to-void' to
1208	// 'pointer-to-function'.
1209	if (!CStyle && Self.getLangOpts().MSVCCompat &&
1210	DestPointee->isFunctionType()) {
1211	Self.Diag(OpRange.getBegin(), diag::ext_ms_cast_fn_obj) << OpRange;
1212	Kind = CK_BitCast;
1213	return TC_Success;
1214	}
1215	}
1216	else if (DestType->isObjCObjectPointerType()) {
1217	// allow both c-style cast and static_cast of objective-c pointers as
1218	// they are pervasive.
1219	Kind = CK_CPointerToObjCPointerCast;
1220	return TC_Success;
1221	}
1222	else if (CStyle && DestType->isBlockPointerType()) {
1223	// allow c-style cast of void * to block pointers.
1224	Kind = CK_AnyPointerToBlockPointerCast;
1225	return TC_Success;
1226	}
1227	}
1228	}
1229	// Allow arbitrary objective-c pointer conversion with static casts.
1230	if (SrcType->isObjCObjectPointerType() &&
1231	DestType->isObjCObjectPointerType()) {
1232	Kind = CK_BitCast;
1233	return TC_Success;
1234	}
1235	// Allow ns-pointer to cf-pointer conversion in either direction
1236	// with static casts.
1237	if (!CStyle &&
1238	Self.CheckTollFreeBridgeStaticCast(DestType, SrcExpr.get(), Kind))
1239	return TC_Success;
1240
1241	// See if it looks like the user is trying to convert between
1242	// related record types, and select a better diagnostic if so.
1243	if (auto SrcPointer = SrcType->getAs<PointerType>())
1244	if (auto DestPointer = DestType->getAs<PointerType>())
1245	if (SrcPointer->getPointeeType()->getAs<RecordType>() &&
1246	DestPointer->getPointeeType()->getAs<RecordType>())
1247	msg = diag::err_bad_cxx_cast_unrelated_class;
1248
1249	// We tried everything. Everything! Nothing works! :-(
1250	return TC_NotApplicable;
1251	}
1252
1253	/// Tests whether a conversion according to N2844 is valid.
1254	TryCastResult TryLValueToRValueCast(Sema &Self, Expr *SrcExpr,
1255	QualType DestType, bool CStyle,
1256	CastKind &Kind, CXXCastPath &BasePath,
1257	unsigned &msg) {
1258	// C++11 [expr.static.cast]p3:
1259	// A glvalue of type "cv1 T1" can be cast to type "rvalue reference to
1260	// cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
1261	const RValueReferenceType *R = DestType->getAs<RValueReferenceType>();
1262	if (!R)
1263	return TC_NotApplicable;
1264
1265	if (!SrcExpr->isGLValue())
1266	return TC_NotApplicable;
1267
1268	// Because we try the reference downcast before this function, from now on
1269	// this is the only cast possibility, so we issue an error if we fail now.
1270	// FIXME: Should allow casting away constness if CStyle.
1271	bool DerivedToBase;
1272	bool ObjCConversion;
1273	bool ObjCLifetimeConversion;
1274	QualType FromType = SrcExpr->getType();
1275	QualType ToType = R->getPointeeType();
1276	if (CStyle) {
1277	FromType = FromType.getUnqualifiedType();
1278	ToType = ToType.getUnqualifiedType();
1279	}
1280
1281	Sema::ReferenceCompareResult RefResult = Self.CompareReferenceRelationship(
1282	SrcExpr->getBeginLoc(), ToType, FromType, DerivedToBase, ObjCConversion,
1283	ObjCLifetimeConversion);
1284	if (RefResult != Sema::Ref_Compatible) {
1285	if (CStyle \|\| RefResult == Sema::Ref_Incompatible)
1286	return TC_NotApplicable;
1287	// Diagnose types which are reference-related but not compatible here since
1288	// we can provide better diagnostics. In these cases forwarding to
1289	// [expr.static.cast]p4 should never result in a well-formed cast.
1290	msg = SrcExpr->isLValue() ? diag::err_bad_lvalue_to_rvalue_cast
1291	: diag::err_bad_rvalue_to_rvalue_cast;
1292	return TC_Failed;
1293	}
1294
1295	if (DerivedToBase) {
1296	Kind = CK_DerivedToBase;
1297	CXXBasePaths Paths(/FindAmbiguities=/true, /RecordPaths=/true,
1298	/DetectVirtual=/true);
1299	if (!Self.IsDerivedFrom(SrcExpr->getBeginLoc(), SrcExpr->getType(),
1300	R->getPointeeType(), Paths))
1301	return TC_NotApplicable;
1302
1303	Self.BuildBasePathArray(Paths, BasePath);
1304	} else
1305	Kind = CK_NoOp;
1306
1307	return TC_Success;
1308	}
1309
1310	/// Tests whether a conversion according to C++ 5.2.9p5 is valid.
1311	TryCastResult
1312	TryStaticReferenceDowncast(Sema &Self, Expr *SrcExpr, QualType DestType,
1313	bool CStyle, SourceRange OpRange,
1314	unsigned &msg, CastKind &Kind,
1315	CXXCastPath &BasePath) {
1316	// C++ 5.2.9p5: An lvalue of type "cv1 B", where B is a class type, can be
1317	// cast to type "reference to cv2 D", where D is a class derived from B,
1318	// if a valid standard conversion from "pointer to D" to "pointer to B"
1319	// exists, cv2 >= cv1, and B is not a virtual base class of D.
1320	// In addition, DR54 clarifies that the base must be accessible in the
1321	// current context. Although the wording of DR54 only applies to the pointer
1322	// variant of this rule, the intent is clearly for it to apply to the this
1323	// conversion as well.
1324
1325	const ReferenceType *DestReference = DestType->getAs<ReferenceType>();
1326	if (!DestReference) {
1327	return TC_NotApplicable;
1328	}
1329	bool RValueRef = DestReference->isRValueReferenceType();
1330	if (!RValueRef && !SrcExpr->isLValue()) {
1331	// We know the left side is an lvalue reference, so we can suggest a reason.
1332	msg = diag::err_bad_cxx_cast_rvalue;
1333	return TC_NotApplicable;
1334	}
1335
1336	QualType DestPointee = DestReference->getPointeeType();
1337
1338	// FIXME: If the source is a prvalue, we should issue a warning (because the
1339	// cast always has undefined behavior), and for AST consistency, we should
1340	// materialize a temporary.
1341	return TryStaticDowncast(Self,
1342	Self.Context.getCanonicalType(SrcExpr->getType()),
1343	Self.Context.getCanonicalType(DestPointee), CStyle,
1344	OpRange, SrcExpr->getType(), DestType, msg, Kind,
1345	BasePath);
1346	}
1347
1348	/// Tests whether a conversion according to C++ 5.2.9p8 is valid.
1349	TryCastResult
1350	TryStaticPointerDowncast(Sema &Self, QualType SrcType, QualType DestType,
1351	bool CStyle, SourceRange OpRange,
1352	unsigned &msg, CastKind &Kind,
1353	CXXCastPath &BasePath) {
1354	// C++ 5.2.9p8: An rvalue of type "pointer to cv1 B", where B is a class
1355	// type, can be converted to an rvalue of type "pointer to cv2 D", where D
1356	// is a class derived from B, if a valid standard conversion from "pointer
1357	// to D" to "pointer to B" exists, cv2 >= cv1, and B is not a virtual base
1358	// class of D.
1359	// In addition, DR54 clarifies that the base must be accessible in the
1360	// current context.
1361
1362	const PointerType *DestPointer = DestType->getAs<PointerType>();
1363	if (!DestPointer) {
1364	return TC_NotApplicable;
1365	}
1366
1367	const PointerType *SrcPointer = SrcType->getAs<PointerType>();
1368	if (!SrcPointer) {
1369	msg = diag::err_bad_static_cast_pointer_nonpointer;
1370	return TC_NotApplicable;
1371	}
1372
1373	return TryStaticDowncast(Self,
1374	Self.Context.getCanonicalType(SrcPointer->getPointeeType()),
1375	Self.Context.getCanonicalType(DestPointer->getPointeeType()),
1376	CStyle, OpRange, SrcType, DestType, msg, Kind,
1377	BasePath);
1378	}
1379
1380	/// TryStaticDowncast - Common functionality of TryStaticReferenceDowncast and
1381	/// TryStaticPointerDowncast. Tests whether a static downcast from SrcType to
1382	/// DestType is possible and allowed.
1383	TryCastResult
1384	TryStaticDowncast(Sema &Self, CanQualType SrcType, CanQualType DestType,
1385	bool CStyle, SourceRange OpRange, QualType OrigSrcType,
1386	QualType OrigDestType, unsigned &msg,
1387	CastKind &Kind, CXXCastPath &BasePath) {
1388	// We can only work with complete types. But don't complain if it doesn't work
1389	if (!Self.isCompleteType(OpRange.getBegin(), SrcType) \|\|
1390	!Self.isCompleteType(OpRange.getBegin(), DestType))
1391	return TC_NotApplicable;
1392
1393	// Downcast can only happen in class hierarchies, so we need classes.
1394	if (!DestType->getAs<RecordType>() \|\| !SrcType->getAs<RecordType>()) {
1395	return TC_NotApplicable;
1396	}
1397
1398	CXXBasePaths Paths(/FindAmbiguities=/true, /RecordPaths=/true,
1399	/DetectVirtual=/true);
1400	if (!Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths)) {
1401	return TC_NotApplicable;
1402	}
1403
1404	// Target type does derive from source type. Now we're serious. If an error
1405	// appears now, it's not ignored.
1406	// This may not be entirely in line with the standard. Take for example:
1407	// struct A {};
1408	// struct B : virtual A {
1409	// B(A&);
1410	// };
1411	//
1412	// void f()
1413	// {
1414	// (void)static_cast<const B&>(((A)0));
1415	// }
1416	// As far as the standard is concerned, p5 does not apply (A is virtual), so
1417	// p2 should be used instead - "const B& t(((A)0));" is perfectly valid.
1418	// However, both GCC and Comeau reject this example, and accepting it would
1419	// mean more complex code if we're to preserve the nice error message.
1420	// FIXME: Being 100% compliant here would be nice to have.
1421
1422	// Must preserve cv, as always, unless we're in C-style mode.
1423	if (!CStyle && !DestType.isAtLeastAsQualifiedAs(SrcType)) {
1424	msg = diag::err_bad_cxx_cast_qualifiers_away;
1425	return TC_Failed;
1426	}
1427
1428	if (Paths.isAmbiguous(SrcType.getUnqualifiedType())) {
1429	// This code is analoguous to that in CheckDerivedToBaseConversion, except
1430	// that it builds the paths in reverse order.
1431	// To sum up: record all paths to the base and build a nice string from
1432	// them. Use it to spice up the error message.
1433	if (!Paths.isRecordingPaths()) {
1434	Paths.clear();
1435	Paths.setRecordingPaths(true);
1436	Self.IsDerivedFrom(OpRange.getBegin(), DestType, SrcType, Paths);
1437	}
1438	std::string PathDisplayStr;
1439	std::set<unsigned> DisplayedPaths;
1440	for (clang::CXXBasePath &Path : Paths) {
1441	if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
1442	// We haven't displayed a path to this particular base
1443	// class subobject yet.
1444	PathDisplayStr += "\n ";
1445	for (CXXBasePathElement &PE : llvm::reverse(Path))
1446	PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
1447	PathDisplayStr += QualType(DestType).getAsString();
1448	}
1449	}
1450
1451	Self.Diag(OpRange.getBegin(), diag::err_ambiguous_base_to_derived_cast)
1452	<< QualType(SrcType).getUnqualifiedType()
1453	<< QualType(DestType).getUnqualifiedType()
1454	<< PathDisplayStr << OpRange;
1455	msg = 0;
1456	return TC_Failed;
1457	}
1458
1459	if (Paths.getDetectedVirtual() != nullptr) {
1460	QualType VirtualBase(Paths.getDetectedVirtual(), 0);
1461	Self.Diag(OpRange.getBegin(), diag::err_static_downcast_via_virtual)
1462	<< OrigSrcType << OrigDestType << VirtualBase << OpRange;
1463	msg = 0;
1464	return TC_Failed;
1465	}
1466
1467	if (!CStyle) {
1468	switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1469	SrcType, DestType,
1470	Paths.front(),
1471	diag::err_downcast_from_inaccessible_base)) {
1472	case Sema::AR_accessible:
1473	case Sema::AR_delayed: // be optimistic
1474	case Sema::AR_dependent: // be optimistic
1475	break;
1476
1477	case Sema::AR_inaccessible:
1478	msg = 0;
1479	return TC_Failed;
1480	}
1481	}
1482
1483	Self.BuildBasePathArray(Paths, BasePath);
1484	Kind = CK_BaseToDerived;
1485	return TC_Success;
1486	}
1487
1488	/// TryStaticMemberPointerUpcast - Tests whether a conversion according to
1489	/// C++ 5.2.9p9 is valid:
1490	///
1491	/// An rvalue of type "pointer to member of D of type cv1 T" can be
1492	/// converted to an rvalue of type "pointer to member of B of type cv2 T",
1493	/// where B is a base class of D [...].
1494	///
1495	TryCastResult
1496	TryStaticMemberPointerUpcast(Sema &Self, ExprResult &SrcExpr, QualType SrcType,
1497	QualType DestType, bool CStyle,
1498	SourceRange OpRange,
1499	unsigned &msg, CastKind &Kind,
1500	CXXCastPath &BasePath) {
1501	const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>();
1502	if (!DestMemPtr)
1503	return TC_NotApplicable;
1504
1505	bool WasOverloadedFunction = false;
1506	DeclAccessPair FoundOverload;
1507	if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
1508	if (FunctionDecl *Fn
1509	= Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(), DestType, false,
1510	FoundOverload)) {
1511	CXXMethodDecl *M = cast<CXXMethodDecl>(Fn);
1512	SrcType = Self.Context.getMemberPointerType(Fn->getType(),
1513	Self.Context.getTypeDeclType(M->getParent()).getTypePtr());
1514	WasOverloadedFunction = true;
1515	}
1516	}
1517
1518	const MemberPointerType *SrcMemPtr = SrcType->getAs<MemberPointerType>();
1519	if (!SrcMemPtr) {
1520	msg = diag::err_bad_static_cast_member_pointer_nonmp;
1521	return TC_NotApplicable;
1522	}
1523
1524	// Lock down the inheritance model right now in MS ABI, whether or not the
1525	// pointee types are the same.
1526	if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
1527	(void)Self.isCompleteType(OpRange.getBegin(), SrcType);
1528	(void)Self.isCompleteType(OpRange.getBegin(), DestType);
1529	}
1530
1531	// T == T, modulo cv
1532	if (!Self.Context.hasSameUnqualifiedType(SrcMemPtr->getPointeeType(),
1533	DestMemPtr->getPointeeType()))
1534	return TC_NotApplicable;
1535
1536	// B base of D
1537	QualType SrcClass(SrcMemPtr->getClass(), 0);
1538	QualType DestClass(DestMemPtr->getClass(), 0);
1539	CXXBasePaths Paths(/FindAmbiguities=/true, /RecordPaths=/true,
1540	/DetectVirtual=/true);
1541	if (!Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths))
1542	return TC_NotApplicable;
1543
1544	// B is a base of D. But is it an allowed base? If not, it's a hard error.
1545	if (Paths.isAmbiguous(Self.Context.getCanonicalType(DestClass))) {
1546	Paths.clear();
1547	Paths.setRecordingPaths(true);
1548	bool StillOkay =
1549	Self.IsDerivedFrom(OpRange.getBegin(), SrcClass, DestClass, Paths);
1550	assert(StillOkay);
1551	(void)StillOkay;
1552	std::string PathDisplayStr = Self.getAmbiguousPathsDisplayString(Paths);
1553	Self.Diag(OpRange.getBegin(), diag::err_ambiguous_memptr_conv)
1554	<< 1 << SrcClass << DestClass << PathDisplayStr << OpRange;
1555	msg = 0;
1556	return TC_Failed;
1557	}
1558
1559	if (const RecordType *VBase = Paths.getDetectedVirtual()) {
1560	Self.Diag(OpRange.getBegin(), diag::err_memptr_conv_via_virtual)
1561	<< SrcClass << DestClass << QualType(VBase, 0) << OpRange;
1562	msg = 0;
1563	return TC_Failed;
1564	}
1565
1566	if (!CStyle) {
1567	switch (Self.CheckBaseClassAccess(OpRange.getBegin(),
1568	DestClass, SrcClass,
1569	Paths.front(),
1570	diag::err_upcast_to_inaccessible_base)) {
1571	case Sema::AR_accessible:
1572	case Sema::AR_delayed:
1573	case Sema::AR_dependent:
1574	// Optimistically assume that the delayed and dependent cases
1575	// will work out.
1576	break;
1577
1578	case Sema::AR_inaccessible:
1579	msg = 0;
1580	return TC_Failed;
1581	}
1582	}
1583
1584	if (WasOverloadedFunction) {
1585	// Resolve the address of the overloaded function again, this time
1586	// allowing complaints if something goes wrong.
1587	FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
1588	DestType,
1589	true,
1590	FoundOverload);
1591	if (!Fn) {
1592	msg = 0;
1593	return TC_Failed;
1594	}
1595
1596	SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr, FoundOverload, Fn);
1597	if (!SrcExpr.isUsable()) {
1598	msg = 0;
1599	return TC_Failed;
1600	}
1601	}
1602
1603	Self.BuildBasePathArray(Paths, BasePath);
1604	Kind = CK_DerivedToBaseMemberPointer;
1605	return TC_Success;
1606	}
1607
1608	/// TryStaticImplicitCast - Tests whether a conversion according to C++ 5.2.9p2
1609	/// is valid:
1610	///
1611	/// An expression e can be explicitly converted to a type T using a
1612	/// @c static_cast if the declaration "T t(e);" is well-formed [...].
1613	TryCastResult
1614	TryStaticImplicitCast(Sema &Self, ExprResult &SrcExpr, QualType DestType,
1615	Sema::CheckedConversionKind CCK,
1616	SourceRange OpRange, unsigned &msg,
1617	CastKind &Kind, bool ListInitialization) {
1618	if (DestType->isRecordType()) {
1619	if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
1620	diag::err_bad_dynamic_cast_incomplete) \|\|
1621	Self.RequireNonAbstractType(OpRange.getBegin(), DestType,
1622	diag::err_allocation_of_abstract_type)) {
1623	msg = 0;
1624	return TC_Failed;
1625	}
1626	}
1627
1628	InitializedEntity Entity = InitializedEntity::InitializeTemporary(DestType);
1629	InitializationKind InitKind
1630	= (CCK == Sema::CCK_CStyleCast)
1631	? InitializationKind::CreateCStyleCast(OpRange.getBegin(), OpRange,
1632	ListInitialization)
1633	: (CCK == Sema::CCK_FunctionalCast)
1634	? InitializationKind::CreateFunctionalCast(OpRange, ListInitialization)
1635	: InitializationKind::CreateCast(OpRange);
1636	Expr *SrcExprRaw = SrcExpr.get();
1637	// FIXME: Per DR242, we should check for an implicit conversion sequence
1638	// or for a constructor that could be invoked by direct-initialization
1639	// here, not for an initialization sequence.
1640	InitializationSequence InitSeq(Self, Entity, InitKind, SrcExprRaw);
1641
1642	// At this point of CheckStaticCast, if the destination is a reference,
1643	// or the expression is an overload expression this has to work.
1644	// There is no other way that works.
1645	// On the other hand, if we're checking a C-style cast, we've still got
1646	// the reinterpret_cast way.
1647	bool CStyle
1648	= (CCK == Sema::CCK_CStyleCast \|\| CCK == Sema::CCK_FunctionalCast);
1649	if (InitSeq.Failed() && (CStyle \|\| !DestType->isReferenceType()))
1650	return TC_NotApplicable;
1651
1652	ExprResult Result = InitSeq.Perform(Self, Entity, InitKind, SrcExprRaw);
1653	if (Result.isInvalid()) {
1654	msg = 0;
1655	return TC_Failed;
1656	}
1657
1658	if (InitSeq.isConstructorInitialization())
1659	Kind = CK_ConstructorConversion;
1660	else
1661	Kind = CK_NoOp;
1662
1663	SrcExpr = Result;
1664	return TC_Success;
1665	}
1666
1667	/// TryConstCast - See if a const_cast from source to destination is allowed,
1668	/// and perform it if it is.
1669	static TryCastResult TryConstCast(Sema &Self, ExprResult &SrcExpr,
1670	QualType DestType, bool CStyle,
1671	unsigned &msg) {
1672	DestType = Self.Context.getCanonicalType(DestType);
1673	QualType SrcType = SrcExpr.get()->getType();
1674	bool NeedToMaterializeTemporary = false;
1675
1676	if (const ReferenceType *DestTypeTmp =DestType->getAs<ReferenceType>()) {
1677	// C++11 5.2.11p4:
1678	// if a pointer to T1 can be explicitly converted to the type "pointer to
1679	// T2" using a const_cast, then the following conversions can also be
1680	// made:
1681	// -- an lvalue of type T1 can be explicitly converted to an lvalue of
1682	// type T2 using the cast const_cast<T2&>;
1683	// -- a glvalue of type T1 can be explicitly converted to an xvalue of
1684	// type T2 using the cast const_cast<T2&&>; and
1685	// -- if T1 is a class type, a prvalue of type T1 can be explicitly
1686	// converted to an xvalue of type T2 using the cast const_cast<T2&&>.
1687
1688	if (isa<LValueReferenceType>(DestTypeTmp) && !SrcExpr.get()->isLValue()) {
1689	// Cannot const_cast non-lvalue to lvalue reference type. But if this
1690	// is C-style, static_cast might find a way, so we simply suggest a
1691	// message and tell the parent to keep searching.
1692	msg = diag::err_bad_cxx_cast_rvalue;
1693	return TC_NotApplicable;
1694	}
1695
1696	if (isa<RValueReferenceType>(DestTypeTmp) && SrcExpr.get()->isRValue()) {
1697	if (!SrcType->isRecordType()) {
1698	// Cannot const_cast non-class prvalue to rvalue reference type. But if
1699	// this is C-style, static_cast can do this.
1700	msg = diag::err_bad_cxx_cast_rvalue;
1701	return TC_NotApplicable;
1702	}
1703
1704	// Materialize the class prvalue so that the const_cast can bind a
1705	// reference to it.
1706	NeedToMaterializeTemporary = true;
1707	}
1708
1709	// It's not completely clear under the standard whether we can
1710	// const_cast bit-field gl-values. Doing so would not be
1711	// intrinsically complicated, but for now, we say no for
1712	// consistency with other compilers and await the word of the
1713	// committee.
1714	if (SrcExpr.get()->refersToBitField()) {
1715	msg = diag::err_bad_cxx_cast_bitfield;
1716	return TC_NotApplicable;
1717	}
1718
1719	DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
1720	SrcType = Self.Context.getPointerType(SrcType);
1721	}
1722
1723	// C++ 5.2.11p5: For a const_cast involving pointers to data members [...]
1724	// the rules for const_cast are the same as those used for pointers.
1725
1726	if (!DestType->isPointerType() &&
1727	!DestType->isMemberPointerType() &&
1728	!DestType->isObjCObjectPointerType()) {
1729	// Cannot cast to non-pointer, non-reference type. Note that, if DestType
1730	// was a reference type, we converted it to a pointer above.
1731	// The status of rvalue references isn't entirely clear, but it looks like
1732	// conversion to them is simply invalid.
1733	// C++ 5.2.11p3: For two pointer types [...]
1734	if (!CStyle)
1735	msg = diag::err_bad_const_cast_dest;
1736	return TC_NotApplicable;
1737	}
1738	if (DestType->isFunctionPointerType() \|\|
1739	DestType->isMemberFunctionPointerType()) {
1740	// Cannot cast direct function pointers.
1741	// C++ 5.2.11p2: [...] where T is any object type or the void type [...]
1742	// T is the ultimate pointee of source and target type.
1743	if (!CStyle)
1744	msg = diag::err_bad_const_cast_dest;
1745	return TC_NotApplicable;
1746	}
1747
1748	// C++ [expr.const.cast]p3:
1749	// "For two similar types T1 and T2, [...]"
1750	//
1751	// We only allow a const_cast to change cvr-qualifiers, not other kinds of
1752	// type qualifiers. (Likewise, we ignore other changes when determining
1753	// whether a cast casts away constness.)
1754	if (!Self.Context.hasCvrSimilarType(SrcType, DestType))
1755	return TC_NotApplicable;
1756
1757	if (NeedToMaterializeTemporary)
1758	// This is a const_cast from a class prvalue to an rvalue reference type.
1759	// Materialize a temporary to store the result of the conversion.
1760	SrcExpr = Self.CreateMaterializeTemporaryExpr(SrcExpr.get()->getType(),
1761	SrcExpr.get(),
1762	/IsLValueReference/ false);
1763
1764	return TC_Success;
1765	}
1766
1767	// Checks for undefined behavior in reinterpret_cast.
1768	// The cases that is checked for is:
1769	// reinterpret_cast<T>(&a)
1770	// reinterpret_cast<T&>(a)
1771	// where accessing 'a' as type 'T' will result in undefined behavior.
1772	void Sema::CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType,
1773	bool IsDereference,
1774	SourceRange Range) {
1775	unsigned DiagID = IsDereference ?
1776	diag::warn_pointer_indirection_from_incompatible_type :
1777	diag::warn_undefined_reinterpret_cast;
1778
1779	if (Diags.isIgnored(DiagID, Range.getBegin()))
1780	return;
1781
1782	QualType SrcTy, DestTy;
1783	if (IsDereference) {
1784	if (!SrcType->getAs<PointerType>() \|\| !DestType->getAs<PointerType>()) {
1785	return;
1786	}
1787	SrcTy = SrcType->getPointeeType();
1788	DestTy = DestType->getPointeeType();
1789	} else {
1790	if (!DestType->getAs<ReferenceType>()) {
1791	return;
1792	}
1793	SrcTy = SrcType;
1794	DestTy = DestType->getPointeeType();
1795	}
1796
1797	// Cast is compatible if the types are the same.
1798	if (Context.hasSameUnqualifiedType(DestTy, SrcTy)) {
1799	return;
1800	}
1801	// or one of the types is a char or void type
1802	if (DestTy->isAnyCharacterType() \|\| DestTy->isVoidType() \|\|
1803	SrcTy->isAnyCharacterType() \|\| SrcTy->isVoidType()) {
1804	return;
1805	}
1806	// or one of the types is a tag type.
1807	if (SrcTy->getAs<TagType>() \|\| DestTy->getAs<TagType>()) {
1808	return;
1809	}
1810
1811	// FIXME: Scoped enums?
1812	if ((SrcTy->isUnsignedIntegerType() && DestTy->isSignedIntegerType()) \|\|
1813	(SrcTy->isSignedIntegerType() && DestTy->isUnsignedIntegerType())) {
1814	if (Context.getTypeSize(DestTy) == Context.getTypeSize(SrcTy)) {
1815	return;
1816	}
1817	}
1818
1819	Diag(Range.getBegin(), DiagID) << SrcType << DestType << Range;
1820	}
1821
1822	static void DiagnoseCastOfObjCSEL(Sema &Self, const ExprResult &SrcExpr,
1823	QualType DestType) {
1824	QualType SrcType = SrcExpr.get()->getType();
1825	if (Self.Context.hasSameType(SrcType, DestType))
1826	return;
1827	if (const PointerType *SrcPtrTy = SrcType->getAs<PointerType>())
1828	if (SrcPtrTy->isObjCSelType()) {
1829	QualType DT = DestType;
1830	if (isa<PointerType>(DestType))
1831	DT = DestType->getPointeeType();
1832	if (!DT.getUnqualifiedType()->isVoidType())
1833	Self.Diag(SrcExpr.get()->getExprLoc(),
1834	diag::warn_cast_pointer_from_sel)
1835	<< SrcType << DestType << SrcExpr.get()->getSourceRange();
1836	}
1837	}
1838
1839	/// Diagnose casts that change the calling convention of a pointer to a function
1840	/// defined in the current TU.
1841	static void DiagnoseCallingConvCast(Sema &Self, const ExprResult &SrcExpr,
1842	QualType DstType, SourceRange OpRange) {
1843	// Check if this cast would change the calling convention of a function
1844	// pointer type.
1845	QualType SrcType = SrcExpr.get()->getType();
1846	if (Self.Context.hasSameType(SrcType, DstType) \|\|
1847	!SrcType->isFunctionPointerType() \|\| !DstType->isFunctionPointerType())
1848	return;
1849	const auto *SrcFTy =
1850	SrcType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
1851	const auto *DstFTy =
1852	DstType->castAs<PointerType>()->getPointeeType()->castAs<FunctionType>();
1853	CallingConv SrcCC = SrcFTy->getCallConv();
1854	CallingConv DstCC = DstFTy->getCallConv();
1855	if (SrcCC == DstCC)
1856	return;
1857
1858	// We have a calling convention cast. Check if the source is a pointer to a
1859	// known, specific function that has already been defined.
1860	Expr *Src = SrcExpr.get()->IgnoreParenImpCasts();
1861	if (auto *UO = dyn_cast<UnaryOperator>(Src))
1862	if (UO->getOpcode() == UO_AddrOf)
1863	Src = UO->getSubExpr()->IgnoreParenImpCasts();
1864	auto *DRE = dyn_cast<DeclRefExpr>(Src);
1865	if (!DRE)
1866	return;
1867	auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
1868	if (!FD)
1869	return;
1870
1871	// Only warn if we are casting from the default convention to a non-default
1872	// convention. This can happen when the programmer forgot to apply the calling
1873	// convention to the function declaration and then inserted this cast to
1874	// satisfy the type system.
1875	CallingConv DefaultCC = Self.getASTContext().getDefaultCallingConvention(
1876	FD->isVariadic(), FD->isCXXInstanceMember());
1877	if (DstCC == DefaultCC \|\| SrcCC != DefaultCC)
1878	return;
1879
1880	// Diagnose this cast, as it is probably bad.
1881	StringRef SrcCCName = FunctionType::getNameForCallConv(SrcCC);
1882	StringRef DstCCName = FunctionType::getNameForCallConv(DstCC);
1883	Self.Diag(OpRange.getBegin(), diag::warn_cast_calling_conv)
1884	<< SrcCCName << DstCCName << OpRange;
1885
1886	// The checks above are cheaper than checking if the diagnostic is enabled.
1887	// However, it's worth checking if the warning is enabled before we construct
1888	// a fixit.
1889	if (Self.Diags.isIgnored(diag::warn_cast_calling_conv, OpRange.getBegin()))
1890	return;
1891
1892	// Try to suggest a fixit to change the calling convention of the function
1893	// whose address was taken. Try to use the latest macro for the convention.
1894	// For example, users probably want to write "WINAPI" instead of "__stdcall"
1895	// to match the Windows header declarations.
1896	SourceLocation NameLoc = FD->getFirstDecl()->getNameInfo().getLoc();
1897	Preprocessor &PP = Self.getPreprocessor();
1898	SmallVector<TokenValue, 6> AttrTokens;
1899	SmallString<64> CCAttrText;
1900	llvm::raw_svector_ostream OS(CCAttrText);
1901	if (Self.getLangOpts().MicrosoftExt) {
1902	// __stdcall or __vectorcall
1903	OS << "__" << DstCCName;
1904	IdentifierInfo *II = PP.getIdentifierInfo(OS.str());
1905	AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
1906	? TokenValue(II->getTokenID())
1907	: TokenValue(II));
1908	} else {
1909	// __attribute__((stdcall)) or __attribute__((vectorcall))
1910	OS << "__attribute__((" << DstCCName << "))";
1911	AttrTokens.push_back(tok::kw___attribute);
1912	AttrTokens.push_back(tok::l_paren);
1913	AttrTokens.push_back(tok::l_paren);
1914	IdentifierInfo *II = PP.getIdentifierInfo(DstCCName);
1915	AttrTokens.push_back(II->isKeyword(Self.getLangOpts())
1916	? TokenValue(II->getTokenID())
1917	: TokenValue(II));
1918	AttrTokens.push_back(tok::r_paren);
1919	AttrTokens.push_back(tok::r_paren);
1920	}
1921	StringRef AttrSpelling = PP.getLastMacroWithSpelling(NameLoc, AttrTokens);
1922	if (!AttrSpelling.empty())
1923	CCAttrText = AttrSpelling;
1924	OS << ' ';
1925	Self.Diag(NameLoc, diag::note_change_calling_conv_fixit)
1926	<< FD << DstCCName << FixItHint::CreateInsertion(NameLoc, CCAttrText);
1927	}
1928
1929	static void checkIntToPointerCast(bool CStyle, SourceLocation Loc,
1930	const Expr *SrcExpr, QualType DestType,
1931	Sema &Self) {
1932	QualType SrcType = SrcExpr->getType();
1933
1934	// Not warning on reinterpret_cast, boolean, constant expressions, etc
1935	// are not explicit design choices, but consistent with GCC's behavior.
1936	// Feel free to modify them if you've reason/evidence for an alternative.
1937	if (CStyle && SrcType->isIntegralType(Self.Context)
1938	&& !SrcType->isBooleanType()
1939	&& !SrcType->isEnumeralType()
1940	&& !SrcExpr->isIntegerConstantExpr(Self.Context)
1941	&& Self.Context.getTypeSize(DestType) >
1942	Self.Context.getTypeSize(SrcType)) {
1943	// Separate between casts to void* and non-void* pointers.
1944	// Some APIs use (abuse) void* for something like a user context,
1945	// and often that value is an integer even if it isn't a pointer itself.
1946	// Having a separate warning flag allows users to control the warning
1947	// for their workflow.
1948	unsigned Diag = DestType->isVoidPointerType() ?
1949	diag::warn_int_to_void_pointer_cast
1950	: diag::warn_int_to_pointer_cast;
1951	Self.Diag(Loc, Diag) << SrcType << DestType;
1952	}
1953	}
1954
1955	static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType,
1956	ExprResult &Result) {
1957	// We can only fix an overloaded reinterpret_cast if
1958	// - it is a template with explicit arguments that resolves to an lvalue
1959	// unambiguously, or
1960	// - it is the only function in an overload set that may have its address
1961	// taken.
1962
1963	Expr *E = Result.get();
1964	// TODO: what if this fails because of DiagnoseUseOfDecl or something
1965	// like it?
1966	if (Self.ResolveAndFixSingleFunctionTemplateSpecialization(
1967	Result,
1968	Expr::getValueKindForType(DestType) == VK_RValue // Convert Fun to Ptr
1969	) &&
1970	Result.isUsable())
1971	return true;
1972
1973	// No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
1974	// preserves Result.
1975	Result = E;
1976	if (!Self.resolveAndFixAddressOfOnlyViableOverloadCandidate(
1977	Result, /DoFunctionPointerConversion=/true))
1978	return false;
1979	return Result.isUsable();
1980	}
1981
1982	static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
1983	QualType DestType, bool CStyle,
1984	SourceRange OpRange,
1985	unsigned &msg,
1986	CastKind &Kind) {
1987	bool IsLValueCast = false;
1988
1989	DestType = Self.Context.getCanonicalType(DestType);
1990	QualType SrcType = SrcExpr.get()->getType();
1991
1992	// Is the source an overloaded name? (i.e. &foo)
1993	// If so, reinterpret_cast generally can not help us here (13.4, p1, bullet 5)
1994	if (SrcType == Self.Context.OverloadTy) {
1995	ExprResult FixedExpr = SrcExpr;
1996	if (!fixOverloadedReinterpretCastExpr(Self, DestType, FixedExpr))
1997	return TC_NotApplicable;
1998
1999	(0) . __assert_fail ("FixedExpr.isUsable() && \"Invalid result fixing overloaded expr\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 1999, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(FixedExpr.isUsable() && "Invalid result fixing overloaded expr");
2000	SrcExpr = FixedExpr;
2001	SrcType = SrcExpr.get()->getType();
2002	}
2003
2004	if (const ReferenceType *DestTypeTmp = DestType->getAs<ReferenceType>()) {
2005	if (!SrcExpr.get()->isGLValue()) {
2006	// Cannot cast non-glvalue to (lvalue or rvalue) reference type. See the
2007	// similar comment in const_cast.
2008	msg = diag::err_bad_cxx_cast_rvalue;
2009	return TC_NotApplicable;
2010	}
2011
2012	if (!CStyle) {
2013	Self.CheckCompatibleReinterpretCast(SrcType, DestType,
2014	/isDereference=/false, OpRange);
2015	}
2016
2017	// C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
2018	// same effect as the conversion reinterpret_cast<T>(&x) with the
2019	// built-in & and * operators.
2020
2021	const char *inappropriate = nullptr;
2022	switch (SrcExpr.get()->getObjectKind()) {
2023	case OK_Ordinary:
2024	break;
2025	case OK_BitField:
2026	msg = diag::err_bad_cxx_cast_bitfield;
2027	return TC_NotApplicable;
2028	// FIXME: Use a specific diagnostic for the rest of these cases.
2029	case OK_VectorComponent: inappropriate = "vector element"; break;
2030	case OK_ObjCProperty: inappropriate = "property expression"; break;
2031	case OK_ObjCSubscript: inappropriate = "container subscripting expression";
2032	break;
2033	}
2034	if (inappropriate) {
2035	Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_reference)
2036	<< inappropriate << DestType
2037	<< OpRange << SrcExpr.get()->getSourceRange();
2038	msg = 0; SrcExpr = ExprError();
2039	return TC_NotApplicable;
2040	}
2041
2042	// This code does this transformation for the checked types.
2043	DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
2044	SrcType = Self.Context.getPointerType(SrcType);
2045
2046	IsLValueCast = true;
2047	}
2048
2049	// Canonicalize source for comparison.
2050	SrcType = Self.Context.getCanonicalType(SrcType);
2051
2052	const MemberPointerType *DestMemPtr = DestType->getAs<MemberPointerType>(),
2053	*SrcMemPtr = SrcType->getAs<MemberPointerType>();
2054	if (DestMemPtr && SrcMemPtr) {
2055	// C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
2056	// can be explicitly converted to an rvalue of type "pointer to member
2057	// of Y of type T2" if T1 and T2 are both function types or both object
2058	// types.
2059	if (DestMemPtr->isMemberFunctionPointer() !=
2060	SrcMemPtr->isMemberFunctionPointer())
2061	return TC_NotApplicable;
2062
2063	if (Self.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
2064	// We need to determine the inheritance model that the class will use if
2065	// haven't yet.
2066	(void)Self.isCompleteType(OpRange.getBegin(), SrcType);
2067	(void)Self.isCompleteType(OpRange.getBegin(), DestType);
2068	}
2069
2070	// Don't allow casting between member pointers of different sizes.
2071	if (Self.Context.getTypeSize(DestMemPtr) !=
2072	Self.Context.getTypeSize(SrcMemPtr)) {
2073	msg = diag::err_bad_cxx_cast_member_pointer_size;
2074	return TC_Failed;
2075	}
2076
2077	// C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
2078	// constness.
2079	// A reinterpret_cast followed by a const_cast can, though, so in C-style,
2080	// we accept it.
2081	if (auto CACK =
2082	CastsAwayConstness(Self, SrcType, DestType, /CheckCVR=/!CStyle,
2083	/CheckObjCLifetime=/CStyle))
2084	return getCastAwayConstnessCastKind(CACK, msg);
2085
2086	// A valid member pointer cast.
2087	assert(!IsLValueCast);
2088	Kind = CK_ReinterpretMemberPointer;
2089	return TC_Success;
2090	}
2091
2092	// See below for the enumeral issue.
2093	if (SrcType->isNullPtrType() && DestType->isIntegralType(Self.Context)) {
2094	// C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
2095	// type large enough to hold it. A value of std::nullptr_t can be
2096	// converted to an integral type; the conversion has the same meaning
2097	// and validity as a conversion of (void*)0 to the integral type.
2098	if (Self.Context.getTypeSize(SrcType) >
2099	Self.Context.getTypeSize(DestType)) {
2100	msg = diag::err_bad_reinterpret_cast_small_int;
2101	return TC_Failed;
2102	}
2103	Kind = CK_PointerToIntegral;
2104	return TC_Success;
2105	}
2106
2107	// Allow reinterpret_casts between vectors of the same size and
2108	// between vectors and integers of the same size.
2109	bool destIsVector = DestType->isVectorType();
2110	bool srcIsVector = SrcType->isVectorType();
2111	if (srcIsVector \|\| destIsVector) {
2112	// The non-vector type, if any, must have integral type. This is
2113	// the same rule that C vector casts use; note, however, that enum
2114	// types are not integral in C++.
2115	if ((!destIsVector && !DestType->isIntegralType(Self.Context)) \|\|
2116	(!srcIsVector && !SrcType->isIntegralType(Self.Context)))
2117	return TC_NotApplicable;
2118
2119	// The size we want to consider is eltCount * eltSize.
2120	// That's exactly what the lax-conversion rules will check.
2121	if (Self.areLaxCompatibleVectorTypes(SrcType, DestType)) {
2122	Kind = CK_BitCast;
2123	return TC_Success;
2124	}
2125
2126	// Otherwise, pick a reasonable diagnostic.
2127	if (!destIsVector)
2128	msg = diag::err_bad_cxx_cast_vector_to_scalar_different_size;
2129	else if (!srcIsVector)
2130	msg = diag::err_bad_cxx_cast_scalar_to_vector_different_size;
2131	else
2132	msg = diag::err_bad_cxx_cast_vector_to_vector_different_size;
2133
2134	return TC_Failed;
2135	}
2136
2137	if (SrcType == DestType) {
2138	// C++ 5.2.10p2 has a note that mentions that, subject to all other
2139	// restrictions, a cast to the same type is allowed so long as it does not
2140	// cast away constness. In C++98, the intent was not entirely clear here,
2141	// since all other paragraphs explicitly forbid casts to the same type.
2142	// C++11 clarifies this case with p2.
2143	//
2144	// The only allowed types are: integral, enumeration, pointer, or
2145	// pointer-to-member types. We also won't restrict Obj-C pointers either.
2146	Kind = CK_NoOp;
2147	TryCastResult Result = TC_NotApplicable;
2148	if (SrcType->isIntegralOrEnumerationType() \|\|
2149	SrcType->isAnyPointerType() \|\|
2150	SrcType->isMemberPointerType() \|\|
2151	SrcType->isBlockPointerType()) {
2152	Result = TC_Success;
2153	}
2154	return Result;
2155	}
2156
2157	bool destIsPtr = DestType->isAnyPointerType() \|\|
2158	DestType->isBlockPointerType();
2159	bool srcIsPtr = SrcType->isAnyPointerType() \|\|
2160	SrcType->isBlockPointerType();
2161	if (!destIsPtr && !srcIsPtr) {
2162	// Except for std::nullptr_t->integer and lvalue->reference, which are
2163	// handled above, at least one of the two arguments must be a pointer.
2164	return TC_NotApplicable;
2165	}
2166
2167	if (DestType->isIntegralType(Self.Context)) {
2168	(0) . __assert_fail ("srcIsPtr && \"One type must be a pointer\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 2168, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(srcIsPtr && "One type must be a pointer");
2169	// C++ 5.2.10p4: A pointer can be explicitly converted to any integral
2170	// type large enough to hold it; except in Microsoft mode, where the
2171	// integral type size doesn't matter (except we don't allow bool).
2172	bool MicrosoftException = Self.getLangOpts().MicrosoftExt &&
2173	!DestType->isBooleanType();
2174	if ((Self.Context.getTypeSize(SrcType) >
2175	Self.Context.getTypeSize(DestType)) &&
2176	!MicrosoftException) {
2177	msg = diag::err_bad_reinterpret_cast_small_int;
2178	return TC_Failed;
2179	}
2180	Kind = CK_PointerToIntegral;
2181	return TC_Success;
2182	}
2183
2184	if (SrcType->isIntegralOrEnumerationType()) {
2185	(0) . __assert_fail ("destIsPtr && \"One type must be a pointer\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 2185, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(destIsPtr && "One type must be a pointer");
2186	checkIntToPointerCast(CStyle, OpRange.getBegin(), SrcExpr.get(), DestType,
2187	Self);
2188	// C++ 5.2.10p5: A value of integral or enumeration type can be explicitly
2189	// converted to a pointer.
2190	// C++ 5.2.10p9: [Note: ...a null pointer constant of integral type is not
2191	// necessarily converted to a null pointer value.]
2192	Kind = CK_IntegralToPointer;
2193	return TC_Success;
2194	}
2195
2196	if (!destIsPtr \|\| !srcIsPtr) {
2197	// With the valid non-pointer conversions out of the way, we can be even
2198	// more stringent.
2199	return TC_NotApplicable;
2200	}
2201
2202	// Cannot convert between block pointers and Objective-C object pointers.
2203	if ((SrcType->isBlockPointerType() && DestType->isObjCObjectPointerType()) \|\|
2204	(DestType->isBlockPointerType() && SrcType->isObjCObjectPointerType()))
2205	return TC_NotApplicable;
2206
2207	// C++ 5.2.10p2: The reinterpret_cast operator shall not cast away constness.
2208	// The C-style cast operator can.
2209	TryCastResult SuccessResult = TC_Success;
2210	if (auto CACK =
2211	CastsAwayConstness(Self, SrcType, DestType, /CheckCVR=/!CStyle,
2212	/CheckObjCLifetime=/CStyle))
2213	SuccessResult = getCastAwayConstnessCastKind(CACK, msg);
2214
2215	if (IsAddressSpaceConversion(SrcType, DestType)) {
2216	Kind = CK_AddressSpaceConversion;
2217	isPointerType() && DestType->isPointerType()", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 2217, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(SrcType->isPointerType() && DestType->isPointerType());
2218	if (!CStyle &&
2219	!DestType->getPointeeType().getQualifiers().isAddressSpaceSupersetOf(
2220	SrcType->getPointeeType().getQualifiers())) {
2221	SuccessResult = TC_Failed;
2222	}
2223	} else if (IsLValueCast) {
2224	Kind = CK_LValueBitCast;
2225	} else if (DestType->isObjCObjectPointerType()) {
2226	Kind = Self.PrepareCastToObjCObjectPointer(SrcExpr);
2227	} else if (DestType->isBlockPointerType()) {
2228	if (!SrcType->isBlockPointerType()) {
2229	Kind = CK_AnyPointerToBlockPointerCast;
2230	} else {
2231	Kind = CK_BitCast;
2232	}
2233	} else {
2234	Kind = CK_BitCast;
2235	}
2236
2237	// Any pointer can be cast to an Objective-C pointer type with a C-style
2238	// cast.
2239	if (CStyle && DestType->isObjCObjectPointerType()) {
2240	return SuccessResult;
2241	}
2242	if (CStyle)
2243	DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2244
2245	DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2246
2247	// Not casting away constness, so the only remaining check is for compatible
2248	// pointer categories.
2249
2250	if (SrcType->isFunctionPointerType()) {
2251	if (DestType->isFunctionPointerType()) {
2252	// C++ 5.2.10p6: A pointer to a function can be explicitly converted to
2253	// a pointer to a function of a different type.
2254	return SuccessResult;
2255	}
2256
2257	// C++0x 5.2.10p8: Converting a pointer to a function into a pointer to
2258	// an object type or vice versa is conditionally-supported.
2259	// Compilers support it in C++03 too, though, because it's necessary for
2260	// casting the return value of dlsym() and GetProcAddress().
2261	// FIXME: Conditionally-supported behavior should be configurable in the
2262	// TargetInfo or similar.
2263	Self.Diag(OpRange.getBegin(),
2264	Self.getLangOpts().CPlusPlus11 ?
2265	diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2266	<< OpRange;
2267	return SuccessResult;
2268	}
2269
2270	if (DestType->isFunctionPointerType()) {
2271	// See above.
2272	Self.Diag(OpRange.getBegin(),
2273	Self.getLangOpts().CPlusPlus11 ?
2274	diag::warn_cxx98_compat_cast_fn_obj : diag::ext_cast_fn_obj)
2275	<< OpRange;
2276	return SuccessResult;
2277	}
2278
2279	// C++ 5.2.10p7: A pointer to an object can be explicitly converted to
2280	// a pointer to an object of different type.
2281	// Void pointers are not specified, but supported by every compiler out there.
2282	// So we finish by allowing everything that remains - it's got to be two
2283	// object pointers.
2284	return SuccessResult;
2285	}
2286
2287	static TryCastResult TryAddressSpaceCast(Sema &Self, ExprResult &SrcExpr,
2288	QualType DestType, bool CStyle,
2289	unsigned &msg) {
2290	if (!Self.getLangOpts().OpenCL)
2291	// FIXME: As compiler doesn't have any information about overlapping addr
2292	// spaces at the moment we have to be permissive here.
2293	return TC_NotApplicable;
2294	// Even though the logic below is general enough and can be applied to
2295	// non-OpenCL mode too, we fast-path above because no other languages
2296	// define overlapping address spaces currently.
2297	auto SrcType = SrcExpr.get()->getType();
2298	auto SrcPtrType = SrcType->getAs<PointerType>();
2299	if (!SrcPtrType)
2300	return TC_NotApplicable;
2301	auto DestPtrType = DestType->getAs<PointerType>();
2302	if (!DestPtrType)
2303	return TC_NotApplicable;
2304	auto SrcPointeeType = SrcPtrType->getPointeeType();
2305	auto DestPointeeType = DestPtrType->getPointeeType();
2306	if (SrcPointeeType.getAddressSpace() == DestPointeeType.getAddressSpace())
2307	return TC_NotApplicable;
2308	if (!DestPtrType->isAddressSpaceOverlapping(*SrcPtrType)) {
2309	msg = diag::err_bad_cxx_cast_addr_space_mismatch;
2310	return TC_Failed;
2311	}
2312	auto SrcPointeeTypeWithoutAS =
2313	Self.Context.removeAddrSpaceQualType(SrcPointeeType.getCanonicalType());
2314	auto DestPointeeTypeWithoutAS =
2315	Self.Context.removeAddrSpaceQualType(DestPointeeType.getCanonicalType());
2316	return Self.Context.hasSameType(SrcPointeeTypeWithoutAS,
2317	DestPointeeTypeWithoutAS)
2318	? TC_Success
2319	: TC_NotApplicable;
2320	}
2321
2322	void CastOperation::checkAddressSpaceCast(QualType SrcType, QualType DestType) {
2323	// In OpenCL only conversions between pointers to objects in overlapping
2324	// addr spaces are allowed. v2.0 s6.5.5 - Generic addr space overlaps
2325	// with any named one, except for constant.
2326	if (Self.getLangOpts().OpenCL) {
2327	auto SrcPtrType = SrcType->getAs<PointerType>();
2328	if (!SrcPtrType)
2329	return;
2330	auto DestPtrType = DestType->getAs<PointerType>();
2331	if (!DestPtrType)
2332	return;
2333	if (!DestPtrType->isAddressSpaceOverlapping(*SrcPtrType)) {
2334	Self.Diag(OpRange.getBegin(),
2335	diag::err_typecheck_incompatible_address_space)
2336	<< SrcType << DestType << Sema::AA_Casting
2337	<< SrcExpr.get()->getSourceRange();
2338	SrcExpr = ExprError();
2339	}
2340	}
2341	}
2342
2343	void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
2344	bool ListInitialization) {
2345	assert(Self.getLangOpts().CPlusPlus);
2346
2347	// Handle placeholders.
2348	if (isPlaceholder()) {
2349	// C-style casts can resolve __unknown_any types.
2350	if (claimPlaceholder(BuiltinType::UnknownAny)) {
2351	SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2352	SrcExpr.get(), Kind,
2353	ValueKind, BasePath);
2354	return;
2355	}
2356
2357	checkNonOverloadPlaceholders();
2358	if (SrcExpr.isInvalid())
2359	return;
2360	}
2361
2362	// C++ 5.2.9p4: Any expression can be explicitly converted to type "cv void".
2363	// This test is outside everything else because it's the only case where
2364	// a non-lvalue-reference target type does not lead to decay.
2365	if (DestType->isVoidType()) {
2366	Kind = CK_ToVoid;
2367
2368	if (claimPlaceholder(BuiltinType::Overload)) {
2369	Self.ResolveAndFixSingleFunctionTemplateSpecialization(
2370	SrcExpr, /* Decay Function to ptr */ false,
2371	/* Complain */ true, DestRange, DestType,
2372	diag::err_bad_cstyle_cast_overload);
2373	if (SrcExpr.isInvalid())
2374	return;
2375	}
2376
2377	SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2378	return;
2379	}
2380
2381	// If the type is dependent, we won't do any other semantic analysis now.
2382	if (DestType->isDependentType() \|\| SrcExpr.get()->isTypeDependent() \|\|
2383	SrcExpr.get()->isValueDependent()) {
2384	assert(Kind == CK_Dependent);
2385	return;
2386	}
2387
2388	if (ValueKind == VK_RValue && !DestType->isRecordType() &&
2389	!isPlaceholder(BuiltinType::Overload)) {
2390	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2391	if (SrcExpr.isInvalid())
2392	return;
2393	}
2394
2395	// AltiVec vector initialization with a single literal.
2396	if (const VectorType *vecTy = DestType->getAs<VectorType>())
2397	if (vecTy->getVectorKind() == VectorType::AltiVecVector
2398	&& (SrcExpr.get()->getType()->isIntegerType()
2399	\|\| SrcExpr.get()->getType()->isFloatingType())) {
2400	Kind = CK_VectorSplat;
2401	SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2402	return;
2403	}
2404
2405	// C++ [expr.cast]p5: The conversions performed by
2406	// - a const_cast,
2407	// - a static_cast,
2408	// - a static_cast followed by a const_cast,
2409	// - a reinterpret_cast, or
2410	// - a reinterpret_cast followed by a const_cast,
2411	// can be performed using the cast notation of explicit type conversion.
2412	// [...] If a conversion can be interpreted in more than one of the ways
2413	// listed above, the interpretation that appears first in the list is used,
2414	// even if a cast resulting from that interpretation is ill-formed.
2415	// In plain language, this means trying a const_cast ...
2416	// Note that for address space we check compatibility after const_cast.
2417	unsigned msg = diag::err_bad_cxx_cast_generic;
2418	TryCastResult tcr = TryConstCast(Self, SrcExpr, DestType,
2419	/CStyle/ true, msg);
2420	if (SrcExpr.isInvalid())
2421	return;
2422	if (isValidCast(tcr))
2423	Kind = CK_NoOp;
2424
2425	Sema::CheckedConversionKind CCK =
2426	FunctionalStyle ? Sema::CCK_FunctionalCast : Sema::CCK_CStyleCast;
2427	if (tcr == TC_NotApplicable) {
2428	tcr = TryAddressSpaceCast(Self, SrcExpr, DestType, /CStyle/ true, msg);
2429	if (SrcExpr.isInvalid())
2430	return;
2431	if (tcr == TC_NotApplicable) {
2432	// ... or if that is not possible, a static_cast, ignoring const, ...
2433	tcr = TryStaticCast(Self, SrcExpr, DestType, CCK, OpRange, msg, Kind,
2434	BasePath, ListInitialization);
2435	if (SrcExpr.isInvalid())
2436	return;
2437
2438	if (tcr == TC_NotApplicable) {
2439	// ... and finally a reinterpret_cast, ignoring const.
2440	tcr = TryReinterpretCast(Self, SrcExpr, DestType, /CStyle/ true,
2441	OpRange, msg, Kind);
2442	if (SrcExpr.isInvalid())
2443	return;
2444	}
2445	}
2446	}
2447
2448	if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
2449	isValidCast(tcr))
2450	checkObjCConversion(CCK);
2451
2452	if (tcr != TC_Success && msg != 0) {
2453	if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2454	DeclAccessPair Found;
2455	FunctionDecl *Fn = Self.ResolveAddressOfOverloadedFunction(SrcExpr.get(),
2456	DestType,
2457	/Complain/ true,
2458	Found);
2459	if (Fn) {
2460	// If DestType is a function type (not to be confused with the function
2461	// pointer type), it will be possible to resolve the function address,
2462	// but the type cast should be considered as failure.
2463	OverloadExpr *OE = OverloadExpr::find(SrcExpr.get()).Expression;
2464	Self.Diag(OpRange.getBegin(), diag::err_bad_cstyle_cast_overload)
2465	<< OE->getName() << DestType << OpRange
2466	<< OE->getQualifierLoc().getSourceRange();
2467	Self.NoteAllOverloadCandidates(SrcExpr.get());
2468	}
2469	} else {
2470	diagnoseBadCast(Self, msg, (FunctionalStyle ? CT_Functional : CT_CStyle),
2471	OpRange, SrcExpr.get(), DestType, ListInitialization);
2472	}
2473	}
2474
2475	if (isValidCast(tcr)) {
2476	if (Kind == CK_BitCast)
2477	checkCastAlign();
2478	} else {
2479	SrcExpr = ExprError();
2480	}
2481	}
2482
2483	/// DiagnoseBadFunctionCast - Warn whenever a function call is cast to a
2484	/// non-matching type. Such as enum function call to int, int call to
2485	/// pointer; etc. Cast to 'void' is an exception.
2486	static void DiagnoseBadFunctionCast(Sema &Self, const ExprResult &SrcExpr,
2487	QualType DestType) {
2488	if (Self.Diags.isIgnored(diag::warn_bad_function_cast,
2489	SrcExpr.get()->getExprLoc()))
2490	return;
2491
2492	if (!isa<CallExpr>(SrcExpr.get()))
2493	return;
2494
2495	QualType SrcType = SrcExpr.get()->getType();
2496	if (DestType.getUnqualifiedType()->isVoidType())
2497	return;
2498	if ((SrcType->isAnyPointerType() \|\| SrcType->isBlockPointerType())
2499	&& (DestType->isAnyPointerType() \|\| DestType->isBlockPointerType()))
2500	return;
2501	if (SrcType->isIntegerType() && DestType->isIntegerType() &&
2502	(SrcType->isBooleanType() == DestType->isBooleanType()) &&
2503	(SrcType->isEnumeralType() == DestType->isEnumeralType()))
2504	return;
2505	if (SrcType->isRealFloatingType() && DestType->isRealFloatingType())
2506	return;
2507	if (SrcType->isEnumeralType() && DestType->isEnumeralType())
2508	return;
2509	if (SrcType->isComplexType() && DestType->isComplexType())
2510	return;
2511	if (SrcType->isComplexIntegerType() && DestType->isComplexIntegerType())
2512	return;
2513
2514	Self.Diag(SrcExpr.get()->getExprLoc(),
2515	diag::warn_bad_function_cast)
2516	<< SrcType << DestType << SrcExpr.get()->getSourceRange();
2517	}
2518
2519	/// Check the semantics of a C-style cast operation, in C.
2520	void CastOperation::CheckCStyleCast() {
2521	assert(!Self.getLangOpts().CPlusPlus);
2522
2523	// C-style casts can resolve __unknown_any types.
2524	if (claimPlaceholder(BuiltinType::UnknownAny)) {
2525	SrcExpr = Self.checkUnknownAnyCast(DestRange, DestType,
2526	SrcExpr.get(), Kind,
2527	ValueKind, BasePath);
2528	return;
2529	}
2530
2531	// C99 6.5.4p2: the cast type needs to be void or scalar and the expression
2532	// type needs to be scalar.
2533	if (DestType->isVoidType()) {
2534	// We don't necessarily do lvalue-to-rvalue conversions on this.
2535	SrcExpr = Self.IgnoredValueConversions(SrcExpr.get());
2536	if (SrcExpr.isInvalid())
2537	return;
2538
2539	// Cast to void allows any expr type.
2540	Kind = CK_ToVoid;
2541	return;
2542	}
2543
2544	// Overloads are allowed with C extensions, so we need to support them.
2545	if (SrcExpr.get()->getType() == Self.Context.OverloadTy) {
2546	DeclAccessPair DAP;
2547	if (FunctionDecl *FD = Self.ResolveAddressOfOverloadedFunction(
2548	SrcExpr.get(), DestType, /Complain=/true, DAP))
2549	SrcExpr = Self.FixOverloadedFunctionReference(SrcExpr.get(), DAP, FD);
2550	else
2551	return;
2552	assert(SrcExpr.isUsable());
2553	}
2554	SrcExpr = Self.DefaultFunctionArrayLvalueConversion(SrcExpr.get());
2555	if (SrcExpr.isInvalid())
2556	return;
2557	QualType SrcType = SrcExpr.get()->getType();
2558
2559	isPlaceholderType()", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 2559, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!SrcType->isPlaceholderType());
2560
2561	checkAddressSpaceCast(SrcType, DestType);
2562	if (SrcExpr.isInvalid())
2563	return;
2564
2565	if (Self.RequireCompleteType(OpRange.getBegin(), DestType,
2566	diag::err_typecheck_cast_to_incomplete)) {
2567	SrcExpr = ExprError();
2568	return;
2569	}
2570
2571	if (!DestType->isScalarType() && !DestType->isVectorType()) {
2572	const RecordType *DestRecordTy = DestType->getAs<RecordType>();
2573
2574	if (DestRecordTy && Self.Context.hasSameUnqualifiedType(DestType, SrcType)){
2575	// GCC struct/union extension: allow cast to self.
2576	Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_nonscalar)
2577	<< DestType << SrcExpr.get()->getSourceRange();
2578	Kind = CK_NoOp;
2579	return;
2580	}
2581
2582	// GCC's cast to union extension.
2583	if (DestRecordTy && DestRecordTy->getDecl()->isUnion()) {
2584	RecordDecl *RD = DestRecordTy->getDecl();
2585	if (CastExpr::getTargetFieldForToUnionCast(RD, SrcType)) {
2586	Self.Diag(OpRange.getBegin(), diag::ext_typecheck_cast_to_union)
2587	<< SrcExpr.get()->getSourceRange();
2588	Kind = CK_ToUnion;
2589	return;
2590	} else {
2591	Self.Diag(OpRange.getBegin(), diag::err_typecheck_cast_to_union_no_type)
2592	<< SrcType << SrcExpr.get()->getSourceRange();
2593	SrcExpr = ExprError();
2594	return;
2595	}
2596	}
2597
2598	// OpenCL v2.0 s6.13.10 - Allow casts from '0' to event_t type.
2599	if (Self.getLangOpts().OpenCL && DestType->isEventT()) {
2600	Expr::EvalResult Result;
2601	if (SrcExpr.get()->EvaluateAsInt(Result, Self.Context)) {
2602	llvm::APSInt CastInt = Result.Val.getInt();
2603	if (0 == CastInt) {
2604	Kind = CK_ZeroToOCLOpaqueType;
2605	return;
2606	}
2607	Self.Diag(OpRange.getBegin(),
2608	diag::err_opencl_cast_non_zero_to_event_t)
2609	<< CastInt.toString(10) << SrcExpr.get()->getSourceRange();
2610	SrcExpr = ExprError();
2611	return;
2612	}
2613	}
2614
2615	// Reject any other conversions to non-scalar types.
2616	Self.Diag(OpRange.getBegin(), diag::err_typecheck_cond_expect_scalar)
2617	<< DestType << SrcExpr.get()->getSourceRange();
2618	SrcExpr = ExprError();
2619	return;
2620	}
2621
2622	// The type we're casting to is known to be a scalar or vector.
2623
2624	// Require the operand to be a scalar or vector.
2625	if (!SrcType->isScalarType() && !SrcType->isVectorType()) {
2626	Self.Diag(SrcExpr.get()->getExprLoc(),
2627	diag::err_typecheck_expect_scalar_operand)
2628	<< SrcType << SrcExpr.get()->getSourceRange();
2629	SrcExpr = ExprError();
2630	return;
2631	}
2632
2633	if (DestType->isExtVectorType()) {
2634	SrcExpr = Self.CheckExtVectorCast(OpRange, DestType, SrcExpr.get(), Kind);
2635	return;
2636	}
2637
2638	if (const VectorType *DestVecTy = DestType->getAs<VectorType>()) {
2639	if (DestVecTy->getVectorKind() == VectorType::AltiVecVector &&
2640	(SrcType->isIntegerType() \|\| SrcType->isFloatingType())) {
2641	Kind = CK_VectorSplat;
2642	SrcExpr = Self.prepareVectorSplat(DestType, SrcExpr.get());
2643	} else if (Self.CheckVectorCast(OpRange, DestType, SrcType, Kind)) {
2644	SrcExpr = ExprError();
2645	}
2646	return;
2647	}
2648
2649	if (SrcType->isVectorType()) {
2650	if (Self.CheckVectorCast(OpRange, SrcType, DestType, Kind))
2651	SrcExpr = ExprError();
2652	return;
2653	}
2654
2655	// The source and target types are both scalars, i.e.
2656	// - arithmetic types (fundamental, enum, and complex)
2657	// - all kinds of pointers
2658	// Note that member pointers were filtered out with C++, above.
2659
2660	if (isa<ObjCSelectorExpr>(SrcExpr.get())) {
2661	Self.Diag(SrcExpr.get()->getExprLoc(), diag::err_cast_selector_expr);
2662	SrcExpr = ExprError();
2663	return;
2664	}
2665
2666	// If either type is a pointer, the other type has to be either an
2667	// integer or a pointer.
2668	if (!DestType->isArithmeticType()) {
2669	if (!SrcType->isIntegralType(Self.Context) && SrcType->isArithmeticType()) {
2670	Self.Diag(SrcExpr.get()->getExprLoc(),
2671	diag::err_cast_pointer_from_non_pointer_int)
2672	<< SrcType << SrcExpr.get()->getSourceRange();
2673	SrcExpr = ExprError();
2674	return;
2675	}
2676	checkIntToPointerCast(/* CStyle */ true, OpRange.getBegin(), SrcExpr.get(),
2677	DestType, Self);
2678	} else if (!SrcType->isArithmeticType()) {
2679	if (!DestType->isIntegralType(Self.Context) &&
2680	DestType->isArithmeticType()) {
2681	Self.Diag(SrcExpr.get()->getBeginLoc(),
2682	diag::err_cast_pointer_to_non_pointer_int)
2683	<< DestType << SrcExpr.get()->getSourceRange();
2684	SrcExpr = ExprError();
2685	return;
2686	}
2687	}
2688
2689	if (Self.getLangOpts().OpenCL &&
2690	!Self.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
2691	if (DestType->isHalfType()) {
2692	Self.Diag(SrcExpr.get()->getBeginLoc(), diag::err_opencl_cast_to_half)
2693	<< DestType << SrcExpr.get()->getSourceRange();
2694	SrcExpr = ExprError();
2695	return;
2696	}
2697	}
2698
2699	// ARC imposes extra restrictions on casts.
2700	if (Self.getLangOpts().allowsNonTrivialObjCLifetimeQualifiers()) {
2701	checkObjCConversion(Sema::CCK_CStyleCast);
2702	if (SrcExpr.isInvalid())
2703	return;
2704
2705	const PointerType *CastPtr = DestType->getAs<PointerType>();
2706	if (Self.getLangOpts().ObjCAutoRefCount && CastPtr) {
2707	if (const PointerType *ExprPtr = SrcType->getAs<PointerType>()) {
2708	Qualifiers CastQuals = CastPtr->getPointeeType().getQualifiers();
2709	Qualifiers ExprQuals = ExprPtr->getPointeeType().getQualifiers();
2710	if (CastPtr->getPointeeType()->isObjCLifetimeType() &&
2711	ExprPtr->getPointeeType()->isObjCLifetimeType() &&
2712	!CastQuals.compatiblyIncludesObjCLifetime(ExprQuals)) {
2713	Self.Diag(SrcExpr.get()->getBeginLoc(),
2714	diag::err_typecheck_incompatible_ownership)
2715	<< SrcType << DestType << Sema::AA_Casting
2716	<< SrcExpr.get()->getSourceRange();
2717	return;
2718	}
2719	}
2720	}
2721	else if (!Self.CheckObjCARCUnavailableWeakConversion(DestType, SrcType)) {
2722	Self.Diag(SrcExpr.get()->getBeginLoc(),
2723	diag::err_arc_convesion_of_weak_unavailable)
2724	<< 1 << SrcType << DestType << SrcExpr.get()->getSourceRange();
2725	SrcExpr = ExprError();
2726	return;
2727	}
2728	}
2729
2730	DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
2731	DiagnoseCallingConvCast(Self, SrcExpr, DestType, OpRange);
2732	DiagnoseBadFunctionCast(Self, SrcExpr, DestType);
2733	Kind = Self.PrepareScalarCast(SrcExpr, DestType);
2734	if (SrcExpr.isInvalid())
2735	return;
2736
2737	if (Kind == CK_BitCast)
2738	checkCastAlign();
2739	}
2740
2741	/// DiagnoseCastQual - Warn whenever casts discards a qualifiers, be it either
2742	/// const, volatile or both.
2743	static void DiagnoseCastQual(Sema &Self, const ExprResult &SrcExpr,
2744	QualType DestType) {
2745	if (SrcExpr.isInvalid())
2746	return;
2747
2748	QualType SrcType = SrcExpr.get()->getType();
2749	if (!((SrcType->isAnyPointerType() && DestType->isAnyPointerType()) \|\|
2750	DestType->isLValueReferenceType()))
2751	return;
2752
2753	QualType TheOffendingSrcType, TheOffendingDestType;
2754	Qualifiers CastAwayQualifiers;
2755	if (CastsAwayConstness(Self, SrcType, DestType, true, false,
2756	&TheOffendingSrcType, &TheOffendingDestType,
2757	&CastAwayQualifiers) !=
2758	CastAwayConstnessKind::CACK_Similar)
2759	return;
2760
2761	// FIXME: 'restrict' is not properly handled here.
2762	int qualifiers = -1;
2763	if (CastAwayQualifiers.hasConst() && CastAwayQualifiers.hasVolatile()) {
2764	qualifiers = 0;
2765	} else if (CastAwayQualifiers.hasConst()) {
2766	qualifiers = 1;
2767	} else if (CastAwayQualifiers.hasVolatile()) {
2768	qualifiers = 2;
2769	}
2770	// This is a variant of int x; const int y = (const int **)x;
2771	if (qualifiers == -1)
2772	Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual2)
2773	<< SrcType << DestType;
2774	else
2775	Self.Diag(SrcExpr.get()->getBeginLoc(), diag::warn_cast_qual)
2776	<< TheOffendingSrcType << TheOffendingDestType << qualifiers;
2777	}
2778
2779	ExprResult Sema::BuildCStyleCastExpr(SourceLocation LPLoc,
2780	TypeSourceInfo *CastTypeInfo,
2781	SourceLocation RPLoc,
2782	Expr *CastExpr) {
2783	CastOperation Op(*this, CastTypeInfo->getType(), CastExpr);
2784	Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
2785	Op.OpRange = SourceRange(LPLoc, CastExpr->getEndLoc());
2786
2787	if (getLangOpts().CPlusPlus) {
2788	Op.CheckCXXCStyleCast(/FunctionalStyle=/ false,
2789	isa<InitListExpr>(CastExpr));
2790	} else {
2791	Op.CheckCStyleCast();
2792	}
2793
2794	if (Op.SrcExpr.isInvalid())
2795	return ExprError();
2796
2797	// -Wcast-qual
2798	DiagnoseCastQual(Op.Self, Op.SrcExpr, Op.DestType);
2799
2800	return Op.complete(CStyleCastExpr::Create(Context, Op.ResultType,
2801	Op.ValueKind, Op.Kind, Op.SrcExpr.get(),
2802	&Op.BasePath, CastTypeInfo, LPLoc, RPLoc));
2803	}
2804
2805	ExprResult Sema::BuildCXXFunctionalCastExpr(TypeSourceInfo *CastTypeInfo,
2806	QualType Type,
2807	SourceLocation LPLoc,
2808	Expr *CastExpr,
2809	SourceLocation RPLoc) {
2810	(0) . __assert_fail ("LPLoc.isValid() && \"List-initialization shouldn't get here.\"", "/home/seafit/code_projects/clang_source/clang/lib/Sema/SemaCast.cpp", 2810, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(LPLoc.isValid() && "List-initialization shouldn't get here.");
2811	CastOperation Op(*this, Type, CastExpr);
2812	Op.DestRange = CastTypeInfo->getTypeLoc().getSourceRange();
2813	Op.OpRange = SourceRange(Op.DestRange.getBegin(), CastExpr->getEndLoc());
2814
2815	Op.CheckCXXCStyleCast(/FunctionalStyle=/true, /ListInit=/false);
2816	if (Op.SrcExpr.isInvalid())
2817	return ExprError();
2818
2819	auto *SubExpr = Op.SrcExpr.get();
2820	if (auto *BindExpr = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
2821	SubExpr = BindExpr->getSubExpr();
2822	if (auto *ConstructExpr = dyn_cast<CXXConstructExpr>(SubExpr))
2823	ConstructExpr->setParenOrBraceRange(SourceRange(LPLoc, RPLoc));
2824
2825	return Op.complete(CXXFunctionalCastExpr::Create(Context, Op.ResultType,
2826	Op.ValueKind, CastTypeInfo, Op.Kind,
2827	Op.SrcExpr.get(), &Op.BasePath, LPLoc, RPLoc));
2828	}
2829

clang::Sema::ActOnCXXNamedCast

clang::Sema::BuildCXXNamedCast

clang::Sema::CheckCompatibleReinterpretCast

clang::Sema::BuildCStyleCastExpr

clang::Sema::BuildCXXFunctionalCastExpr

Clang Project