1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
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 type-related semantic analysis.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "TypeLocBuilder.h"
14 #include "clang/AST/ASTConsumer.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/ASTStructuralEquivalence.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/DeclTemplate.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/Type.h"
24 #include "clang/AST/TypeLoc.h"
25 #include "clang/AST/TypeLocVisitor.h"
26 #include "clang/Basic/PartialDiagnostic.h"
27 #include "clang/Basic/SourceLocation.h"
28 #include "clang/Basic/Specifiers.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/Preprocessor.h"
31 #include "clang/Sema/DeclSpec.h"
32 #include "clang/Sema/DelayedDiagnostic.h"
33 #include "clang/Sema/Lookup.h"
34 #include "clang/Sema/ParsedTemplate.h"
35 #include "clang/Sema/ScopeInfo.h"
36 #include "clang/Sema/SemaInternal.h"
37 #include "clang/Sema/Template.h"
38 #include "clang/Sema/TemplateInstCallback.h"
39 #include "llvm/ADT/ArrayRef.h"
40 #include "llvm/ADT/SmallPtrSet.h"
41 #include "llvm/ADT/SmallString.h"
42 #include "llvm/ADT/StringExtras.h"
43 #include "llvm/IR/DerivedTypes.h"
44 #include "llvm/Support/Casting.h"
45 #include "llvm/Support/ErrorHandling.h"
46 #include <bitset>
47 #include <optional>
48
49 using namespace clang;
50
51 enum TypeDiagSelector {
52 TDS_Function,
53 TDS_Pointer,
54 TDS_ObjCObjOrBlock
55 };
56
57 /// isOmittedBlockReturnType - Return true if this declarator is missing a
58 /// return type because this is a omitted return type on a block literal.
isOmittedBlockReturnType(const Declarator & D)59 static bool isOmittedBlockReturnType(const Declarator &D) {
60 if (D.getContext() != DeclaratorContext::BlockLiteral ||
61 D.getDeclSpec().hasTypeSpecifier())
62 return false;
63
64 if (D.getNumTypeObjects() == 0)
65 return true; // ^{ ... }
66
67 if (D.getNumTypeObjects() == 1 &&
68 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
69 return true; // ^(int X, float Y) { ... }
70
71 return false;
72 }
73
74 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
75 /// doesn't apply to the given type.
diagnoseBadTypeAttribute(Sema & S,const ParsedAttr & attr,QualType type)76 static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
77 QualType type) {
78 TypeDiagSelector WhichType;
79 bool useExpansionLoc = true;
80 switch (attr.getKind()) {
81 case ParsedAttr::AT_ObjCGC:
82 WhichType = TDS_Pointer;
83 break;
84 case ParsedAttr::AT_ObjCOwnership:
85 WhichType = TDS_ObjCObjOrBlock;
86 break;
87 default:
88 // Assume everything else was a function attribute.
89 WhichType = TDS_Function;
90 useExpansionLoc = false;
91 break;
92 }
93
94 SourceLocation loc = attr.getLoc();
95 StringRef name = attr.getAttrName()->getName();
96
97 // The GC attributes are usually written with macros; special-case them.
98 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
99 : nullptr;
100 if (useExpansionLoc && loc.isMacroID() && II) {
101 if (II->isStr("strong")) {
102 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
103 } else if (II->isStr("weak")) {
104 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
105 }
106 }
107
108 S.Diag(loc, attr.isRegularKeywordAttribute()
109 ? diag::err_type_attribute_wrong_type
110 : diag::warn_type_attribute_wrong_type)
111 << name << WhichType << type;
112 }
113
114 // objc_gc applies to Objective-C pointers or, otherwise, to the
115 // smallest available pointer type (i.e. 'void*' in 'void**').
116 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
117 case ParsedAttr::AT_ObjCGC: \
118 case ParsedAttr::AT_ObjCOwnership
119
120 // Calling convention attributes.
121 #define CALLING_CONV_ATTRS_CASELIST \
122 case ParsedAttr::AT_CDecl: \
123 case ParsedAttr::AT_FastCall: \
124 case ParsedAttr::AT_StdCall: \
125 case ParsedAttr::AT_ThisCall: \
126 case ParsedAttr::AT_RegCall: \
127 case ParsedAttr::AT_Pascal: \
128 case ParsedAttr::AT_SwiftCall: \
129 case ParsedAttr::AT_SwiftAsyncCall: \
130 case ParsedAttr::AT_VectorCall: \
131 case ParsedAttr::AT_AArch64VectorPcs: \
132 case ParsedAttr::AT_AArch64SVEPcs: \
133 case ParsedAttr::AT_AMDGPUKernelCall: \
134 case ParsedAttr::AT_MSABI: \
135 case ParsedAttr::AT_SysVABI: \
136 case ParsedAttr::AT_Pcs: \
137 case ParsedAttr::AT_IntelOclBicc: \
138 case ParsedAttr::AT_PreserveMost: \
139 case ParsedAttr::AT_PreserveAll: \
140 case ParsedAttr::AT_M68kRTD
141
142 // Function type attributes.
143 #define FUNCTION_TYPE_ATTRS_CASELIST \
144 case ParsedAttr::AT_NSReturnsRetained: \
145 case ParsedAttr::AT_NoReturn: \
146 case ParsedAttr::AT_Regparm: \
147 case ParsedAttr::AT_CmseNSCall: \
148 case ParsedAttr::AT_ArmStreaming: \
149 case ParsedAttr::AT_ArmStreamingCompatible: \
150 case ParsedAttr::AT_ArmPreserves: \
151 case ParsedAttr::AT_ArmIn: \
152 case ParsedAttr::AT_ArmOut: \
153 case ParsedAttr::AT_ArmInOut: \
154 case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: \
155 case ParsedAttr::AT_AnyX86NoCfCheck: \
156 CALLING_CONV_ATTRS_CASELIST
157
158 // Microsoft-specific type qualifiers.
159 #define MS_TYPE_ATTRS_CASELIST \
160 case ParsedAttr::AT_Ptr32: \
161 case ParsedAttr::AT_Ptr64: \
162 case ParsedAttr::AT_SPtr: \
163 case ParsedAttr::AT_UPtr
164
165 // Nullability qualifiers.
166 #define NULLABILITY_TYPE_ATTRS_CASELIST \
167 case ParsedAttr::AT_TypeNonNull: \
168 case ParsedAttr::AT_TypeNullable: \
169 case ParsedAttr::AT_TypeNullableResult: \
170 case ParsedAttr::AT_TypeNullUnspecified
171
172 namespace {
173 /// An object which stores processing state for the entire
174 /// GetTypeForDeclarator process.
175 class TypeProcessingState {
176 Sema &sema;
177
178 /// The declarator being processed.
179 Declarator &declarator;
180
181 /// The index of the declarator chunk we're currently processing.
182 /// May be the total number of valid chunks, indicating the
183 /// DeclSpec.
184 unsigned chunkIndex;
185
186 /// The original set of attributes on the DeclSpec.
187 SmallVector<ParsedAttr *, 2> savedAttrs;
188
189 /// A list of attributes to diagnose the uselessness of when the
190 /// processing is complete.
191 SmallVector<ParsedAttr *, 2> ignoredTypeAttrs;
192
193 /// Attributes corresponding to AttributedTypeLocs that we have not yet
194 /// populated.
195 // FIXME: The two-phase mechanism by which we construct Types and fill
196 // their TypeLocs makes it hard to correctly assign these. We keep the
197 // attributes in creation order as an attempt to make them line up
198 // properly.
199 using TypeAttrPair = std::pair<const AttributedType*, const Attr*>;
200 SmallVector<TypeAttrPair, 8> AttrsForTypes;
201 bool AttrsForTypesSorted = true;
202
203 /// MacroQualifiedTypes mapping to macro expansion locations that will be
204 /// stored in a MacroQualifiedTypeLoc.
205 llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros;
206
207 /// Flag to indicate we parsed a noderef attribute. This is used for
208 /// validating that noderef was used on a pointer or array.
209 bool parsedNoDeref;
210
211 public:
TypeProcessingState(Sema & sema,Declarator & declarator)212 TypeProcessingState(Sema &sema, Declarator &declarator)
213 : sema(sema), declarator(declarator),
214 chunkIndex(declarator.getNumTypeObjects()), parsedNoDeref(false) {}
215
getSema() const216 Sema &getSema() const {
217 return sema;
218 }
219
getDeclarator() const220 Declarator &getDeclarator() const {
221 return declarator;
222 }
223
isProcessingDeclSpec() const224 bool isProcessingDeclSpec() const {
225 return chunkIndex == declarator.getNumTypeObjects();
226 }
227
getCurrentChunkIndex() const228 unsigned getCurrentChunkIndex() const {
229 return chunkIndex;
230 }
231
setCurrentChunkIndex(unsigned idx)232 void setCurrentChunkIndex(unsigned idx) {
233 assert(idx <= declarator.getNumTypeObjects());
234 chunkIndex = idx;
235 }
236
getCurrentAttributes() const237 ParsedAttributesView &getCurrentAttributes() const {
238 if (isProcessingDeclSpec())
239 return getMutableDeclSpec().getAttributes();
240 return declarator.getTypeObject(chunkIndex).getAttrs();
241 }
242
243 /// Save the current set of attributes on the DeclSpec.
saveDeclSpecAttrs()244 void saveDeclSpecAttrs() {
245 // Don't try to save them multiple times.
246 if (!savedAttrs.empty())
247 return;
248
249 DeclSpec &spec = getMutableDeclSpec();
250 llvm::append_range(savedAttrs,
251 llvm::make_pointer_range(spec.getAttributes()));
252 }
253
254 /// Record that we had nowhere to put the given type attribute.
255 /// We will diagnose such attributes later.
addIgnoredTypeAttr(ParsedAttr & attr)256 void addIgnoredTypeAttr(ParsedAttr &attr) {
257 ignoredTypeAttrs.push_back(&attr);
258 }
259
260 /// Diagnose all the ignored type attributes, given that the
261 /// declarator worked out to the given type.
diagnoseIgnoredTypeAttrs(QualType type) const262 void diagnoseIgnoredTypeAttrs(QualType type) const {
263 for (auto *Attr : ignoredTypeAttrs)
264 diagnoseBadTypeAttribute(getSema(), *Attr, type);
265 }
266
267 /// Get an attributed type for the given attribute, and remember the Attr
268 /// object so that we can attach it to the AttributedTypeLoc.
getAttributedType(Attr * A,QualType ModifiedType,QualType EquivType)269 QualType getAttributedType(Attr *A, QualType ModifiedType,
270 QualType EquivType) {
271 QualType T =
272 sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType);
273 AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A});
274 AttrsForTypesSorted = false;
275 return T;
276 }
277
278 /// Get a BTFTagAttributed type for the btf_type_tag attribute.
getBTFTagAttributedType(const BTFTypeTagAttr * BTFAttr,QualType WrappedType)279 QualType getBTFTagAttributedType(const BTFTypeTagAttr *BTFAttr,
280 QualType WrappedType) {
281 return sema.Context.getBTFTagAttributedType(BTFAttr, WrappedType);
282 }
283
284 /// Completely replace the \c auto in \p TypeWithAuto by
285 /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if
286 /// necessary.
ReplaceAutoType(QualType TypeWithAuto,QualType Replacement)287 QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) {
288 QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement);
289 if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) {
290 // Attributed type still should be an attributed type after replacement.
291 auto *NewAttrTy = cast<AttributedType>(T.getTypePtr());
292 for (TypeAttrPair &A : AttrsForTypes) {
293 if (A.first == AttrTy)
294 A.first = NewAttrTy;
295 }
296 AttrsForTypesSorted = false;
297 }
298 return T;
299 }
300
301 /// Extract and remove the Attr* for a given attributed type.
takeAttrForAttributedType(const AttributedType * AT)302 const Attr *takeAttrForAttributedType(const AttributedType *AT) {
303 if (!AttrsForTypesSorted) {
304 llvm::stable_sort(AttrsForTypes, llvm::less_first());
305 AttrsForTypesSorted = true;
306 }
307
308 // FIXME: This is quadratic if we have lots of reuses of the same
309 // attributed type.
310 for (auto It = std::partition_point(
311 AttrsForTypes.begin(), AttrsForTypes.end(),
312 [=](const TypeAttrPair &A) { return A.first < AT; });
313 It != AttrsForTypes.end() && It->first == AT; ++It) {
314 if (It->second) {
315 const Attr *Result = It->second;
316 It->second = nullptr;
317 return Result;
318 }
319 }
320
321 llvm_unreachable("no Attr* for AttributedType*");
322 }
323
324 SourceLocation
getExpansionLocForMacroQualifiedType(const MacroQualifiedType * MQT) const325 getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const {
326 auto FoundLoc = LocsForMacros.find(MQT);
327 assert(FoundLoc != LocsForMacros.end() &&
328 "Unable to find macro expansion location for MacroQualifedType");
329 return FoundLoc->second;
330 }
331
setExpansionLocForMacroQualifiedType(const MacroQualifiedType * MQT,SourceLocation Loc)332 void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT,
333 SourceLocation Loc) {
334 LocsForMacros[MQT] = Loc;
335 }
336
setParsedNoDeref(bool parsed)337 void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; }
338
didParseNoDeref() const339 bool didParseNoDeref() const { return parsedNoDeref; }
340
~TypeProcessingState()341 ~TypeProcessingState() {
342 if (savedAttrs.empty())
343 return;
344
345 getMutableDeclSpec().getAttributes().clearListOnly();
346 for (ParsedAttr *AL : savedAttrs)
347 getMutableDeclSpec().getAttributes().addAtEnd(AL);
348 }
349
350 private:
getMutableDeclSpec() const351 DeclSpec &getMutableDeclSpec() const {
352 return const_cast<DeclSpec&>(declarator.getDeclSpec());
353 }
354 };
355 } // end anonymous namespace
356
moveAttrFromListToList(ParsedAttr & attr,ParsedAttributesView & fromList,ParsedAttributesView & toList)357 static void moveAttrFromListToList(ParsedAttr &attr,
358 ParsedAttributesView &fromList,
359 ParsedAttributesView &toList) {
360 fromList.remove(&attr);
361 toList.addAtEnd(&attr);
362 }
363
364 /// The location of a type attribute.
365 enum TypeAttrLocation {
366 /// The attribute is in the decl-specifier-seq.
367 TAL_DeclSpec,
368 /// The attribute is part of a DeclaratorChunk.
369 TAL_DeclChunk,
370 /// The attribute is immediately after the declaration's name.
371 TAL_DeclName
372 };
373
374 static void
375 processTypeAttrs(TypeProcessingState &state, QualType &type,
376 TypeAttrLocation TAL, const ParsedAttributesView &attrs,
377 Sema::CUDAFunctionTarget CFT = Sema::CFT_HostDevice);
378
379 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
380 QualType &type,
381 Sema::CUDAFunctionTarget CFT);
382
383 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
384 ParsedAttr &attr, QualType &type);
385
386 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
387 QualType &type);
388
389 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
390 ParsedAttr &attr, QualType &type);
391
handleObjCPointerTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)392 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
393 ParsedAttr &attr, QualType &type) {
394 if (attr.getKind() == ParsedAttr::AT_ObjCGC)
395 return handleObjCGCTypeAttr(state, attr, type);
396 assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership);
397 return handleObjCOwnershipTypeAttr(state, attr, type);
398 }
399
400 /// Given the index of a declarator chunk, check whether that chunk
401 /// directly specifies the return type of a function and, if so, find
402 /// an appropriate place for it.
403 ///
404 /// \param i - a notional index which the search will start
405 /// immediately inside
406 ///
407 /// \param onlyBlockPointers Whether we should only look into block
408 /// pointer types (vs. all pointer types).
maybeMovePastReturnType(Declarator & declarator,unsigned i,bool onlyBlockPointers)409 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
410 unsigned i,
411 bool onlyBlockPointers) {
412 assert(i <= declarator.getNumTypeObjects());
413
414 DeclaratorChunk *result = nullptr;
415
416 // First, look inwards past parens for a function declarator.
417 for (; i != 0; --i) {
418 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
419 switch (fnChunk.Kind) {
420 case DeclaratorChunk::Paren:
421 continue;
422
423 // If we find anything except a function, bail out.
424 case DeclaratorChunk::Pointer:
425 case DeclaratorChunk::BlockPointer:
426 case DeclaratorChunk::Array:
427 case DeclaratorChunk::Reference:
428 case DeclaratorChunk::MemberPointer:
429 case DeclaratorChunk::Pipe:
430 return result;
431
432 // If we do find a function declarator, scan inwards from that,
433 // looking for a (block-)pointer declarator.
434 case DeclaratorChunk::Function:
435 for (--i; i != 0; --i) {
436 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
437 switch (ptrChunk.Kind) {
438 case DeclaratorChunk::Paren:
439 case DeclaratorChunk::Array:
440 case DeclaratorChunk::Function:
441 case DeclaratorChunk::Reference:
442 case DeclaratorChunk::Pipe:
443 continue;
444
445 case DeclaratorChunk::MemberPointer:
446 case DeclaratorChunk::Pointer:
447 if (onlyBlockPointers)
448 continue;
449
450 [[fallthrough]];
451
452 case DeclaratorChunk::BlockPointer:
453 result = &ptrChunk;
454 goto continue_outer;
455 }
456 llvm_unreachable("bad declarator chunk kind");
457 }
458
459 // If we run out of declarators doing that, we're done.
460 return result;
461 }
462 llvm_unreachable("bad declarator chunk kind");
463
464 // Okay, reconsider from our new point.
465 continue_outer: ;
466 }
467
468 // Ran out of chunks, bail out.
469 return result;
470 }
471
472 /// Given that an objc_gc attribute was written somewhere on a
473 /// declaration *other* than on the declarator itself (for which, use
474 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
475 /// didn't apply in whatever position it was written in, try to move
476 /// it to a more appropriate position.
distributeObjCPointerTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType type)477 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
478 ParsedAttr &attr, QualType type) {
479 Declarator &declarator = state.getDeclarator();
480
481 // Move it to the outermost normal or block pointer declarator.
482 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
483 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
484 switch (chunk.Kind) {
485 case DeclaratorChunk::Pointer:
486 case DeclaratorChunk::BlockPointer: {
487 // But don't move an ARC ownership attribute to the return type
488 // of a block.
489 DeclaratorChunk *destChunk = nullptr;
490 if (state.isProcessingDeclSpec() &&
491 attr.getKind() == ParsedAttr::AT_ObjCOwnership)
492 destChunk = maybeMovePastReturnType(declarator, i - 1,
493 /*onlyBlockPointers=*/true);
494 if (!destChunk) destChunk = &chunk;
495
496 moveAttrFromListToList(attr, state.getCurrentAttributes(),
497 destChunk->getAttrs());
498 return;
499 }
500
501 case DeclaratorChunk::Paren:
502 case DeclaratorChunk::Array:
503 continue;
504
505 // We may be starting at the return type of a block.
506 case DeclaratorChunk::Function:
507 if (state.isProcessingDeclSpec() &&
508 attr.getKind() == ParsedAttr::AT_ObjCOwnership) {
509 if (DeclaratorChunk *dest = maybeMovePastReturnType(
510 declarator, i,
511 /*onlyBlockPointers=*/true)) {
512 moveAttrFromListToList(attr, state.getCurrentAttributes(),
513 dest->getAttrs());
514 return;
515 }
516 }
517 goto error;
518
519 // Don't walk through these.
520 case DeclaratorChunk::Reference:
521 case DeclaratorChunk::MemberPointer:
522 case DeclaratorChunk::Pipe:
523 goto error;
524 }
525 }
526 error:
527
528 diagnoseBadTypeAttribute(state.getSema(), attr, type);
529 }
530
531 /// Distribute an objc_gc type attribute that was written on the
532 /// declarator.
distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType)533 static void distributeObjCPointerTypeAttrFromDeclarator(
534 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) {
535 Declarator &declarator = state.getDeclarator();
536
537 // objc_gc goes on the innermost pointer to something that's not a
538 // pointer.
539 unsigned innermost = -1U;
540 bool considerDeclSpec = true;
541 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
542 DeclaratorChunk &chunk = declarator.getTypeObject(i);
543 switch (chunk.Kind) {
544 case DeclaratorChunk::Pointer:
545 case DeclaratorChunk::BlockPointer:
546 innermost = i;
547 continue;
548
549 case DeclaratorChunk::Reference:
550 case DeclaratorChunk::MemberPointer:
551 case DeclaratorChunk::Paren:
552 case DeclaratorChunk::Array:
553 case DeclaratorChunk::Pipe:
554 continue;
555
556 case DeclaratorChunk::Function:
557 considerDeclSpec = false;
558 goto done;
559 }
560 }
561 done:
562
563 // That might actually be the decl spec if we weren't blocked by
564 // anything in the declarator.
565 if (considerDeclSpec) {
566 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
567 // Splice the attribute into the decl spec. Prevents the
568 // attribute from being applied multiple times and gives
569 // the source-location-filler something to work with.
570 state.saveDeclSpecAttrs();
571 declarator.getMutableDeclSpec().getAttributes().takeOneFrom(
572 declarator.getAttributes(), &attr);
573 return;
574 }
575 }
576
577 // Otherwise, if we found an appropriate chunk, splice the attribute
578 // into it.
579 if (innermost != -1U) {
580 moveAttrFromListToList(attr, declarator.getAttributes(),
581 declarator.getTypeObject(innermost).getAttrs());
582 return;
583 }
584
585 // Otherwise, diagnose when we're done building the type.
586 declarator.getAttributes().remove(&attr);
587 state.addIgnoredTypeAttr(attr);
588 }
589
590 /// A function type attribute was written somewhere in a declaration
591 /// *other* than on the declarator itself or in the decl spec. Given
592 /// that it didn't apply in whatever position it was written in, try
593 /// to move it to a more appropriate position.
distributeFunctionTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType type)594 static void distributeFunctionTypeAttr(TypeProcessingState &state,
595 ParsedAttr &attr, QualType type) {
596 Declarator &declarator = state.getDeclarator();
597
598 // Try to push the attribute from the return type of a function to
599 // the function itself.
600 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
601 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
602 switch (chunk.Kind) {
603 case DeclaratorChunk::Function:
604 moveAttrFromListToList(attr, state.getCurrentAttributes(),
605 chunk.getAttrs());
606 return;
607
608 case DeclaratorChunk::Paren:
609 case DeclaratorChunk::Pointer:
610 case DeclaratorChunk::BlockPointer:
611 case DeclaratorChunk::Array:
612 case DeclaratorChunk::Reference:
613 case DeclaratorChunk::MemberPointer:
614 case DeclaratorChunk::Pipe:
615 continue;
616 }
617 }
618
619 diagnoseBadTypeAttribute(state.getSema(), attr, type);
620 }
621
622 /// Try to distribute a function type attribute to the innermost
623 /// function chunk or type. Returns true if the attribute was
624 /// distributed, false if no location was found.
distributeFunctionTypeAttrToInnermost(TypeProcessingState & state,ParsedAttr & attr,ParsedAttributesView & attrList,QualType & declSpecType,Sema::CUDAFunctionTarget CFT)625 static bool distributeFunctionTypeAttrToInnermost(
626 TypeProcessingState &state, ParsedAttr &attr,
627 ParsedAttributesView &attrList, QualType &declSpecType,
628 Sema::CUDAFunctionTarget CFT) {
629 Declarator &declarator = state.getDeclarator();
630
631 // Put it on the innermost function chunk, if there is one.
632 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
633 DeclaratorChunk &chunk = declarator.getTypeObject(i);
634 if (chunk.Kind != DeclaratorChunk::Function) continue;
635
636 moveAttrFromListToList(attr, attrList, chunk.getAttrs());
637 return true;
638 }
639
640 return handleFunctionTypeAttr(state, attr, declSpecType, CFT);
641 }
642
643 /// A function type attribute was written in the decl spec. Try to
644 /// apply it somewhere.
645 static void
distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType,Sema::CUDAFunctionTarget CFT)646 distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
647 ParsedAttr &attr, QualType &declSpecType,
648 Sema::CUDAFunctionTarget CFT) {
649 state.saveDeclSpecAttrs();
650
651 // Try to distribute to the innermost.
652 if (distributeFunctionTypeAttrToInnermost(
653 state, attr, state.getCurrentAttributes(), declSpecType, CFT))
654 return;
655
656 // If that failed, diagnose the bad attribute when the declarator is
657 // fully built.
658 state.addIgnoredTypeAttr(attr);
659 }
660
661 /// A function type attribute was written on the declarator or declaration.
662 /// Try to apply it somewhere.
663 /// `Attrs` is the attribute list containing the declaration (either of the
664 /// declarator or the declaration).
distributeFunctionTypeAttrFromDeclarator(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType,Sema::CUDAFunctionTarget CFT)665 static void distributeFunctionTypeAttrFromDeclarator(
666 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType,
667 Sema::CUDAFunctionTarget CFT) {
668 Declarator &declarator = state.getDeclarator();
669
670 // Try to distribute to the innermost.
671 if (distributeFunctionTypeAttrToInnermost(
672 state, attr, declarator.getAttributes(), declSpecType, CFT))
673 return;
674
675 // If that failed, diagnose the bad attribute when the declarator is
676 // fully built.
677 declarator.getAttributes().remove(&attr);
678 state.addIgnoredTypeAttr(attr);
679 }
680
681 /// Given that there are attributes written on the declarator or declaration
682 /// itself, try to distribute any type attributes to the appropriate
683 /// declarator chunk.
684 ///
685 /// These are attributes like the following:
686 /// int f ATTR;
687 /// int (f ATTR)();
688 /// but not necessarily this:
689 /// int f() ATTR;
690 ///
691 /// `Attrs` is the attribute list containing the declaration (either of the
692 /// declarator or the declaration).
distributeTypeAttrsFromDeclarator(TypeProcessingState & state,QualType & declSpecType,Sema::CUDAFunctionTarget CFT)693 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
694 QualType &declSpecType,
695 Sema::CUDAFunctionTarget CFT) {
696 // The called functions in this loop actually remove things from the current
697 // list, so iterating over the existing list isn't possible. Instead, make a
698 // non-owning copy and iterate over that.
699 ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()};
700 for (ParsedAttr &attr : AttrsCopy) {
701 // Do not distribute [[]] attributes. They have strict rules for what
702 // they appertain to.
703 if (attr.isStandardAttributeSyntax() || attr.isRegularKeywordAttribute())
704 continue;
705
706 switch (attr.getKind()) {
707 OBJC_POINTER_TYPE_ATTRS_CASELIST:
708 distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType);
709 break;
710
711 FUNCTION_TYPE_ATTRS_CASELIST:
712 distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType, CFT);
713 break;
714
715 MS_TYPE_ATTRS_CASELIST:
716 // Microsoft type attributes cannot go after the declarator-id.
717 continue;
718
719 NULLABILITY_TYPE_ATTRS_CASELIST:
720 // Nullability specifiers cannot go after the declarator-id.
721
722 // Objective-C __kindof does not get distributed.
723 case ParsedAttr::AT_ObjCKindOf:
724 continue;
725
726 default:
727 break;
728 }
729 }
730 }
731
732 /// Add a synthetic '()' to a block-literal declarator if it is
733 /// required, given the return type.
maybeSynthesizeBlockSignature(TypeProcessingState & state,QualType declSpecType)734 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
735 QualType declSpecType) {
736 Declarator &declarator = state.getDeclarator();
737
738 // First, check whether the declarator would produce a function,
739 // i.e. whether the innermost semantic chunk is a function.
740 if (declarator.isFunctionDeclarator()) {
741 // If so, make that declarator a prototyped declarator.
742 declarator.getFunctionTypeInfo().hasPrototype = true;
743 return;
744 }
745
746 // If there are any type objects, the type as written won't name a
747 // function, regardless of the decl spec type. This is because a
748 // block signature declarator is always an abstract-declarator, and
749 // abstract-declarators can't just be parentheses chunks. Therefore
750 // we need to build a function chunk unless there are no type
751 // objects and the decl spec type is a function.
752 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
753 return;
754
755 // Note that there *are* cases with invalid declarators where
756 // declarators consist solely of parentheses. In general, these
757 // occur only in failed efforts to make function declarators, so
758 // faking up the function chunk is still the right thing to do.
759
760 // Otherwise, we need to fake up a function declarator.
761 SourceLocation loc = declarator.getBeginLoc();
762
763 // ...and *prepend* it to the declarator.
764 SourceLocation NoLoc;
765 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
766 /*HasProto=*/true,
767 /*IsAmbiguous=*/false,
768 /*LParenLoc=*/NoLoc,
769 /*ArgInfo=*/nullptr,
770 /*NumParams=*/0,
771 /*EllipsisLoc=*/NoLoc,
772 /*RParenLoc=*/NoLoc,
773 /*RefQualifierIsLvalueRef=*/true,
774 /*RefQualifierLoc=*/NoLoc,
775 /*MutableLoc=*/NoLoc, EST_None,
776 /*ESpecRange=*/SourceRange(),
777 /*Exceptions=*/nullptr,
778 /*ExceptionRanges=*/nullptr,
779 /*NumExceptions=*/0,
780 /*NoexceptExpr=*/nullptr,
781 /*ExceptionSpecTokens=*/nullptr,
782 /*DeclsInPrototype=*/std::nullopt, loc, loc, declarator));
783
784 // For consistency, make sure the state still has us as processing
785 // the decl spec.
786 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
787 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
788 }
789
diagnoseAndRemoveTypeQualifiers(Sema & S,const DeclSpec & DS,unsigned & TypeQuals,QualType TypeSoFar,unsigned RemoveTQs,unsigned DiagID)790 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
791 unsigned &TypeQuals,
792 QualType TypeSoFar,
793 unsigned RemoveTQs,
794 unsigned DiagID) {
795 // If this occurs outside a template instantiation, warn the user about
796 // it; they probably didn't mean to specify a redundant qualifier.
797 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
798 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
799 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
800 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
801 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
802 if (!(RemoveTQs & Qual.first))
803 continue;
804
805 if (!S.inTemplateInstantiation()) {
806 if (TypeQuals & Qual.first)
807 S.Diag(Qual.second, DiagID)
808 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
809 << FixItHint::CreateRemoval(Qual.second);
810 }
811
812 TypeQuals &= ~Qual.first;
813 }
814 }
815
816 /// Return true if this is omitted block return type. Also check type
817 /// attributes and type qualifiers when returning true.
checkOmittedBlockReturnType(Sema & S,Declarator & declarator,QualType Result)818 static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
819 QualType Result) {
820 if (!isOmittedBlockReturnType(declarator))
821 return false;
822
823 // Warn if we see type attributes for omitted return type on a block literal.
824 SmallVector<ParsedAttr *, 2> ToBeRemoved;
825 for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
826 if (AL.isInvalid() || !AL.isTypeAttr())
827 continue;
828 S.Diag(AL.getLoc(),
829 diag::warn_block_literal_attributes_on_omitted_return_type)
830 << AL;
831 ToBeRemoved.push_back(&AL);
832 }
833 // Remove bad attributes from the list.
834 for (ParsedAttr *AL : ToBeRemoved)
835 declarator.getMutableDeclSpec().getAttributes().remove(AL);
836
837 // Warn if we see type qualifiers for omitted return type on a block literal.
838 const DeclSpec &DS = declarator.getDeclSpec();
839 unsigned TypeQuals = DS.getTypeQualifiers();
840 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
841 diag::warn_block_literal_qualifiers_on_omitted_return_type);
842 declarator.getMutableDeclSpec().ClearTypeQualifiers();
843
844 return true;
845 }
846
847 /// Apply Objective-C type arguments to the given type.
applyObjCTypeArgs(Sema & S,SourceLocation loc,QualType type,ArrayRef<TypeSourceInfo * > typeArgs,SourceRange typeArgsRange,bool failOnError,bool rebuilding)848 static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
849 ArrayRef<TypeSourceInfo *> typeArgs,
850 SourceRange typeArgsRange, bool failOnError,
851 bool rebuilding) {
852 // We can only apply type arguments to an Objective-C class type.
853 const auto *objcObjectType = type->getAs<ObjCObjectType>();
854 if (!objcObjectType || !objcObjectType->getInterface()) {
855 S.Diag(loc, diag::err_objc_type_args_non_class)
856 << type
857 << typeArgsRange;
858
859 if (failOnError)
860 return QualType();
861 return type;
862 }
863
864 // The class type must be parameterized.
865 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
866 ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
867 if (!typeParams) {
868 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
869 << objcClass->getDeclName()
870 << FixItHint::CreateRemoval(typeArgsRange);
871
872 if (failOnError)
873 return QualType();
874
875 return type;
876 }
877
878 // The type must not already be specialized.
879 if (objcObjectType->isSpecialized()) {
880 S.Diag(loc, diag::err_objc_type_args_specialized_class)
881 << type
882 << FixItHint::CreateRemoval(typeArgsRange);
883
884 if (failOnError)
885 return QualType();
886
887 return type;
888 }
889
890 // Check the type arguments.
891 SmallVector<QualType, 4> finalTypeArgs;
892 unsigned numTypeParams = typeParams->size();
893 bool anyPackExpansions = false;
894 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
895 TypeSourceInfo *typeArgInfo = typeArgs[i];
896 QualType typeArg = typeArgInfo->getType();
897
898 // Type arguments cannot have explicit qualifiers or nullability.
899 // We ignore indirect sources of these, e.g. behind typedefs or
900 // template arguments.
901 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
902 bool diagnosed = false;
903 SourceRange rangeToRemove;
904 if (auto attr = qual.getAs<AttributedTypeLoc>()) {
905 rangeToRemove = attr.getLocalSourceRange();
906 if (attr.getTypePtr()->getImmediateNullability()) {
907 typeArg = attr.getTypePtr()->getModifiedType();
908 S.Diag(attr.getBeginLoc(),
909 diag::err_objc_type_arg_explicit_nullability)
910 << typeArg << FixItHint::CreateRemoval(rangeToRemove);
911 diagnosed = true;
912 }
913 }
914
915 // When rebuilding, qualifiers might have gotten here through a
916 // final substitution.
917 if (!rebuilding && !diagnosed) {
918 S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
919 << typeArg << typeArg.getQualifiers().getAsString()
920 << FixItHint::CreateRemoval(rangeToRemove);
921 }
922 }
923
924 // Remove qualifiers even if they're non-local.
925 typeArg = typeArg.getUnqualifiedType();
926
927 finalTypeArgs.push_back(typeArg);
928
929 if (typeArg->getAs<PackExpansionType>())
930 anyPackExpansions = true;
931
932 // Find the corresponding type parameter, if there is one.
933 ObjCTypeParamDecl *typeParam = nullptr;
934 if (!anyPackExpansions) {
935 if (i < numTypeParams) {
936 typeParam = typeParams->begin()[i];
937 } else {
938 // Too many arguments.
939 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
940 << false
941 << objcClass->getDeclName()
942 << (unsigned)typeArgs.size()
943 << numTypeParams;
944 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
945 << objcClass;
946
947 if (failOnError)
948 return QualType();
949
950 return type;
951 }
952 }
953
954 // Objective-C object pointer types must be substitutable for the bounds.
955 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
956 // If we don't have a type parameter to match against, assume
957 // everything is fine. There was a prior pack expansion that
958 // means we won't be able to match anything.
959 if (!typeParam) {
960 assert(anyPackExpansions && "Too many arguments?");
961 continue;
962 }
963
964 // Retrieve the bound.
965 QualType bound = typeParam->getUnderlyingType();
966 const auto *boundObjC = bound->castAs<ObjCObjectPointerType>();
967
968 // Determine whether the type argument is substitutable for the bound.
969 if (typeArgObjC->isObjCIdType()) {
970 // When the type argument is 'id', the only acceptable type
971 // parameter bound is 'id'.
972 if (boundObjC->isObjCIdType())
973 continue;
974 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
975 // Otherwise, we follow the assignability rules.
976 continue;
977 }
978
979 // Diagnose the mismatch.
980 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
981 diag::err_objc_type_arg_does_not_match_bound)
982 << typeArg << bound << typeParam->getDeclName();
983 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
984 << typeParam->getDeclName();
985
986 if (failOnError)
987 return QualType();
988
989 return type;
990 }
991
992 // Block pointer types are permitted for unqualified 'id' bounds.
993 if (typeArg->isBlockPointerType()) {
994 // If we don't have a type parameter to match against, assume
995 // everything is fine. There was a prior pack expansion that
996 // means we won't be able to match anything.
997 if (!typeParam) {
998 assert(anyPackExpansions && "Too many arguments?");
999 continue;
1000 }
1001
1002 // Retrieve the bound.
1003 QualType bound = typeParam->getUnderlyingType();
1004 if (bound->isBlockCompatibleObjCPointerType(S.Context))
1005 continue;
1006
1007 // Diagnose the mismatch.
1008 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
1009 diag::err_objc_type_arg_does_not_match_bound)
1010 << typeArg << bound << typeParam->getDeclName();
1011 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
1012 << typeParam->getDeclName();
1013
1014 if (failOnError)
1015 return QualType();
1016
1017 return type;
1018 }
1019
1020 // Dependent types will be checked at instantiation time.
1021 if (typeArg->isDependentType()) {
1022 continue;
1023 }
1024
1025 // Diagnose non-id-compatible type arguments.
1026 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
1027 diag::err_objc_type_arg_not_id_compatible)
1028 << typeArg << typeArgInfo->getTypeLoc().getSourceRange();
1029
1030 if (failOnError)
1031 return QualType();
1032
1033 return type;
1034 }
1035
1036 // Make sure we didn't have the wrong number of arguments.
1037 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
1038 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
1039 << (typeArgs.size() < typeParams->size())
1040 << objcClass->getDeclName()
1041 << (unsigned)finalTypeArgs.size()
1042 << (unsigned)numTypeParams;
1043 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
1044 << objcClass;
1045
1046 if (failOnError)
1047 return QualType();
1048
1049 return type;
1050 }
1051
1052 // Success. Form the specialized type.
1053 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1054 }
1055
BuildObjCTypeParamType(const ObjCTypeParamDecl * Decl,SourceLocation ProtocolLAngleLoc,ArrayRef<ObjCProtocolDecl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc,bool FailOnError)1056 QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
1057 SourceLocation ProtocolLAngleLoc,
1058 ArrayRef<ObjCProtocolDecl *> Protocols,
1059 ArrayRef<SourceLocation> ProtocolLocs,
1060 SourceLocation ProtocolRAngleLoc,
1061 bool FailOnError) {
1062 QualType Result = QualType(Decl->getTypeForDecl(), 0);
1063 if (!Protocols.empty()) {
1064 bool HasError;
1065 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1066 HasError);
1067 if (HasError) {
1068 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
1069 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1070 if (FailOnError) Result = QualType();
1071 }
1072 if (FailOnError && Result.isNull())
1073 return QualType();
1074 }
1075
1076 return Result;
1077 }
1078
BuildObjCObjectType(QualType BaseType,SourceLocation Loc,SourceLocation TypeArgsLAngleLoc,ArrayRef<TypeSourceInfo * > TypeArgs,SourceLocation TypeArgsRAngleLoc,SourceLocation ProtocolLAngleLoc,ArrayRef<ObjCProtocolDecl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc,bool FailOnError,bool Rebuilding)1079 QualType Sema::BuildObjCObjectType(
1080 QualType BaseType, SourceLocation Loc, SourceLocation TypeArgsLAngleLoc,
1081 ArrayRef<TypeSourceInfo *> TypeArgs, SourceLocation TypeArgsRAngleLoc,
1082 SourceLocation ProtocolLAngleLoc, ArrayRef<ObjCProtocolDecl *> Protocols,
1083 ArrayRef<SourceLocation> ProtocolLocs, SourceLocation ProtocolRAngleLoc,
1084 bool FailOnError, bool Rebuilding) {
1085 QualType Result = BaseType;
1086 if (!TypeArgs.empty()) {
1087 Result =
1088 applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
1089 SourceRange(TypeArgsLAngleLoc, TypeArgsRAngleLoc),
1090 FailOnError, Rebuilding);
1091 if (FailOnError && Result.isNull())
1092 return QualType();
1093 }
1094
1095 if (!Protocols.empty()) {
1096 bool HasError;
1097 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1098 HasError);
1099 if (HasError) {
1100 Diag(Loc, diag::err_invalid_protocol_qualifiers)
1101 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1102 if (FailOnError) Result = QualType();
1103 }
1104 if (FailOnError && Result.isNull())
1105 return QualType();
1106 }
1107
1108 return Result;
1109 }
1110
actOnObjCProtocolQualifierType(SourceLocation lAngleLoc,ArrayRef<Decl * > protocols,ArrayRef<SourceLocation> protocolLocs,SourceLocation rAngleLoc)1111 TypeResult Sema::actOnObjCProtocolQualifierType(
1112 SourceLocation lAngleLoc,
1113 ArrayRef<Decl *> protocols,
1114 ArrayRef<SourceLocation> protocolLocs,
1115 SourceLocation rAngleLoc) {
1116 // Form id<protocol-list>.
1117 QualType Result = Context.getObjCObjectType(
1118 Context.ObjCBuiltinIdTy, {},
1119 llvm::ArrayRef((ObjCProtocolDecl *const *)protocols.data(),
1120 protocols.size()),
1121 false);
1122 Result = Context.getObjCObjectPointerType(Result);
1123
1124 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1125 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1126
1127 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
1128 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
1129
1130 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
1131 .castAs<ObjCObjectTypeLoc>();
1132 ObjCObjectTL.setHasBaseTypeAsWritten(false);
1133 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
1134
1135 // No type arguments.
1136 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1137 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1138
1139 // Fill in protocol qualifiers.
1140 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
1141 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
1142 for (unsigned i = 0, n = protocols.size(); i != n; ++i)
1143 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
1144
1145 // We're done. Return the completed type to the parser.
1146 return CreateParsedType(Result, ResultTInfo);
1147 }
1148
actOnObjCTypeArgsAndProtocolQualifiers(Scope * S,SourceLocation Loc,ParsedType BaseType,SourceLocation TypeArgsLAngleLoc,ArrayRef<ParsedType> TypeArgs,SourceLocation TypeArgsRAngleLoc,SourceLocation ProtocolLAngleLoc,ArrayRef<Decl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc)1149 TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
1150 Scope *S,
1151 SourceLocation Loc,
1152 ParsedType BaseType,
1153 SourceLocation TypeArgsLAngleLoc,
1154 ArrayRef<ParsedType> TypeArgs,
1155 SourceLocation TypeArgsRAngleLoc,
1156 SourceLocation ProtocolLAngleLoc,
1157 ArrayRef<Decl *> Protocols,
1158 ArrayRef<SourceLocation> ProtocolLocs,
1159 SourceLocation ProtocolRAngleLoc) {
1160 TypeSourceInfo *BaseTypeInfo = nullptr;
1161 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
1162 if (T.isNull())
1163 return true;
1164
1165 // Handle missing type-source info.
1166 if (!BaseTypeInfo)
1167 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
1168
1169 // Extract type arguments.
1170 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
1171 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
1172 TypeSourceInfo *TypeArgInfo = nullptr;
1173 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
1174 if (TypeArg.isNull()) {
1175 ActualTypeArgInfos.clear();
1176 break;
1177 }
1178
1179 assert(TypeArgInfo && "No type source info?");
1180 ActualTypeArgInfos.push_back(TypeArgInfo);
1181 }
1182
1183 // Build the object type.
1184 QualType Result = BuildObjCObjectType(
1185 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
1186 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
1187 ProtocolLAngleLoc,
1188 llvm::ArrayRef((ObjCProtocolDecl *const *)Protocols.data(),
1189 Protocols.size()),
1190 ProtocolLocs, ProtocolRAngleLoc,
1191 /*FailOnError=*/false,
1192 /*Rebuilding=*/false);
1193
1194 if (Result == T)
1195 return BaseType;
1196
1197 // Create source information for this type.
1198 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1199 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1200
1201 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
1202 // object pointer type. Fill in source information for it.
1203 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
1204 // The '*' is implicit.
1205 ObjCObjectPointerTL.setStarLoc(SourceLocation());
1206 ResultTL = ObjCObjectPointerTL.getPointeeLoc();
1207 }
1208
1209 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
1210 // Protocol qualifier information.
1211 if (OTPTL.getNumProtocols() > 0) {
1212 assert(OTPTL.getNumProtocols() == Protocols.size());
1213 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1214 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1215 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1216 OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
1217 }
1218
1219 // We're done. Return the completed type to the parser.
1220 return CreateParsedType(Result, ResultTInfo);
1221 }
1222
1223 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
1224
1225 // Type argument information.
1226 if (ObjCObjectTL.getNumTypeArgs() > 0) {
1227 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
1228 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
1229 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
1230 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
1231 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
1232 } else {
1233 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1234 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1235 }
1236
1237 // Protocol qualifier information.
1238 if (ObjCObjectTL.getNumProtocols() > 0) {
1239 assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
1240 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1241 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1242 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1243 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
1244 } else {
1245 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
1246 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
1247 }
1248
1249 // Base type.
1250 ObjCObjectTL.setHasBaseTypeAsWritten(true);
1251 if (ObjCObjectTL.getType() == T)
1252 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
1253 else
1254 ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
1255
1256 // We're done. Return the completed type to the parser.
1257 return CreateParsedType(Result, ResultTInfo);
1258 }
1259
1260 static OpenCLAccessAttr::Spelling
getImageAccess(const ParsedAttributesView & Attrs)1261 getImageAccess(const ParsedAttributesView &Attrs) {
1262 for (const ParsedAttr &AL : Attrs)
1263 if (AL.getKind() == ParsedAttr::AT_OpenCLAccess)
1264 return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling());
1265 return OpenCLAccessAttr::Keyword_read_only;
1266 }
1267
1268 static UnaryTransformType::UTTKind
TSTToUnaryTransformType(DeclSpec::TST SwitchTST)1269 TSTToUnaryTransformType(DeclSpec::TST SwitchTST) {
1270 switch (SwitchTST) {
1271 #define TRANSFORM_TYPE_TRAIT_DEF(Enum, Trait) \
1272 case TST_##Trait: \
1273 return UnaryTransformType::Enum;
1274 #include "clang/Basic/TransformTypeTraits.def"
1275 default:
1276 llvm_unreachable("attempted to parse a non-unary transform builtin");
1277 }
1278 }
1279
1280 /// Convert the specified declspec to the appropriate type
1281 /// object.
1282 /// \param state Specifies the declarator containing the declaration specifier
1283 /// to be converted, along with other associated processing state.
1284 /// \returns The type described by the declaration specifiers. This function
1285 /// never returns null.
ConvertDeclSpecToType(TypeProcessingState & state)1286 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
1287 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
1288 // checking.
1289
1290 Sema &S = state.getSema();
1291 Declarator &declarator = state.getDeclarator();
1292 DeclSpec &DS = declarator.getMutableDeclSpec();
1293 SourceLocation DeclLoc = declarator.getIdentifierLoc();
1294 if (DeclLoc.isInvalid())
1295 DeclLoc = DS.getBeginLoc();
1296
1297 ASTContext &Context = S.Context;
1298
1299 QualType Result;
1300 switch (DS.getTypeSpecType()) {
1301 case DeclSpec::TST_void:
1302 Result = Context.VoidTy;
1303 break;
1304 case DeclSpec::TST_char:
1305 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1306 Result = Context.CharTy;
1307 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed)
1308 Result = Context.SignedCharTy;
1309 else {
1310 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1311 "Unknown TSS value");
1312 Result = Context.UnsignedCharTy;
1313 }
1314 break;
1315 case DeclSpec::TST_wchar:
1316 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1317 Result = Context.WCharTy;
1318 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed) {
1319 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1320 << DS.getSpecifierName(DS.getTypeSpecType(),
1321 Context.getPrintingPolicy());
1322 Result = Context.getSignedWCharType();
1323 } else {
1324 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1325 "Unknown TSS value");
1326 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1327 << DS.getSpecifierName(DS.getTypeSpecType(),
1328 Context.getPrintingPolicy());
1329 Result = Context.getUnsignedWCharType();
1330 }
1331 break;
1332 case DeclSpec::TST_char8:
1333 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1334 "Unknown TSS value");
1335 Result = Context.Char8Ty;
1336 break;
1337 case DeclSpec::TST_char16:
1338 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1339 "Unknown TSS value");
1340 Result = Context.Char16Ty;
1341 break;
1342 case DeclSpec::TST_char32:
1343 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1344 "Unknown TSS value");
1345 Result = Context.Char32Ty;
1346 break;
1347 case DeclSpec::TST_unspecified:
1348 // If this is a missing declspec in a block literal return context, then it
1349 // is inferred from the return statements inside the block.
1350 // The declspec is always missing in a lambda expr context; it is either
1351 // specified with a trailing return type or inferred.
1352 if (S.getLangOpts().CPlusPlus14 &&
1353 declarator.getContext() == DeclaratorContext::LambdaExpr) {
1354 // In C++1y, a lambda's implicit return type is 'auto'.
1355 Result = Context.getAutoDeductType();
1356 break;
1357 } else if (declarator.getContext() == DeclaratorContext::LambdaExpr ||
1358 checkOmittedBlockReturnType(S, declarator,
1359 Context.DependentTy)) {
1360 Result = Context.DependentTy;
1361 break;
1362 }
1363
1364 // Unspecified typespec defaults to int in C90. However, the C90 grammar
1365 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
1366 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
1367 // Note that the one exception to this is function definitions, which are
1368 // allowed to be completely missing a declspec. This is handled in the
1369 // parser already though by it pretending to have seen an 'int' in this
1370 // case.
1371 if (S.getLangOpts().isImplicitIntRequired()) {
1372 S.Diag(DeclLoc, diag::warn_missing_type_specifier)
1373 << DS.getSourceRange()
1374 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1375 } else if (!DS.hasTypeSpecifier()) {
1376 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
1377 // "At least one type specifier shall be given in the declaration
1378 // specifiers in each declaration, and in the specifier-qualifier list in
1379 // each struct declaration and type name."
1380 if (!S.getLangOpts().isImplicitIntAllowed() && !DS.isTypeSpecPipe()) {
1381 S.Diag(DeclLoc, diag::err_missing_type_specifier)
1382 << DS.getSourceRange();
1383
1384 // When this occurs, often something is very broken with the value
1385 // being declared, poison it as invalid so we don't get chains of
1386 // errors.
1387 declarator.setInvalidType(true);
1388 } else if (S.getLangOpts().getOpenCLCompatibleVersion() >= 200 &&
1389 DS.isTypeSpecPipe()) {
1390 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
1391 << DS.getSourceRange();
1392 declarator.setInvalidType(true);
1393 } else {
1394 assert(S.getLangOpts().isImplicitIntAllowed() &&
1395 "implicit int is disabled?");
1396 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
1397 << DS.getSourceRange()
1398 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1399 }
1400 }
1401
1402 [[fallthrough]];
1403 case DeclSpec::TST_int: {
1404 if (DS.getTypeSpecSign() != TypeSpecifierSign::Unsigned) {
1405 switch (DS.getTypeSpecWidth()) {
1406 case TypeSpecifierWidth::Unspecified:
1407 Result = Context.IntTy;
1408 break;
1409 case TypeSpecifierWidth::Short:
1410 Result = Context.ShortTy;
1411 break;
1412 case TypeSpecifierWidth::Long:
1413 Result = Context.LongTy;
1414 break;
1415 case TypeSpecifierWidth::LongLong:
1416 Result = Context.LongLongTy;
1417
1418 // 'long long' is a C99 or C++11 feature.
1419 if (!S.getLangOpts().C99) {
1420 if (S.getLangOpts().CPlusPlus)
1421 S.Diag(DS.getTypeSpecWidthLoc(),
1422 S.getLangOpts().CPlusPlus11 ?
1423 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1424 else
1425 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1426 }
1427 break;
1428 }
1429 } else {
1430 switch (DS.getTypeSpecWidth()) {
1431 case TypeSpecifierWidth::Unspecified:
1432 Result = Context.UnsignedIntTy;
1433 break;
1434 case TypeSpecifierWidth::Short:
1435 Result = Context.UnsignedShortTy;
1436 break;
1437 case TypeSpecifierWidth::Long:
1438 Result = Context.UnsignedLongTy;
1439 break;
1440 case TypeSpecifierWidth::LongLong:
1441 Result = Context.UnsignedLongLongTy;
1442
1443 // 'long long' is a C99 or C++11 feature.
1444 if (!S.getLangOpts().C99) {
1445 if (S.getLangOpts().CPlusPlus)
1446 S.Diag(DS.getTypeSpecWidthLoc(),
1447 S.getLangOpts().CPlusPlus11 ?
1448 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1449 else
1450 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1451 }
1452 break;
1453 }
1454 }
1455 break;
1456 }
1457 case DeclSpec::TST_bitint: {
1458 if (!S.Context.getTargetInfo().hasBitIntType())
1459 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "_BitInt";
1460 Result =
1461 S.BuildBitIntType(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned,
1462 DS.getRepAsExpr(), DS.getBeginLoc());
1463 if (Result.isNull()) {
1464 Result = Context.IntTy;
1465 declarator.setInvalidType(true);
1466 }
1467 break;
1468 }
1469 case DeclSpec::TST_accum: {
1470 switch (DS.getTypeSpecWidth()) {
1471 case TypeSpecifierWidth::Short:
1472 Result = Context.ShortAccumTy;
1473 break;
1474 case TypeSpecifierWidth::Unspecified:
1475 Result = Context.AccumTy;
1476 break;
1477 case TypeSpecifierWidth::Long:
1478 Result = Context.LongAccumTy;
1479 break;
1480 case TypeSpecifierWidth::LongLong:
1481 llvm_unreachable("Unable to specify long long as _Accum width");
1482 }
1483
1484 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1485 Result = Context.getCorrespondingUnsignedType(Result);
1486
1487 if (DS.isTypeSpecSat())
1488 Result = Context.getCorrespondingSaturatedType(Result);
1489
1490 break;
1491 }
1492 case DeclSpec::TST_fract: {
1493 switch (DS.getTypeSpecWidth()) {
1494 case TypeSpecifierWidth::Short:
1495 Result = Context.ShortFractTy;
1496 break;
1497 case TypeSpecifierWidth::Unspecified:
1498 Result = Context.FractTy;
1499 break;
1500 case TypeSpecifierWidth::Long:
1501 Result = Context.LongFractTy;
1502 break;
1503 case TypeSpecifierWidth::LongLong:
1504 llvm_unreachable("Unable to specify long long as _Fract width");
1505 }
1506
1507 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1508 Result = Context.getCorrespondingUnsignedType(Result);
1509
1510 if (DS.isTypeSpecSat())
1511 Result = Context.getCorrespondingSaturatedType(Result);
1512
1513 break;
1514 }
1515 case DeclSpec::TST_int128:
1516 if (!S.Context.getTargetInfo().hasInt128Type() &&
1517 !(S.getLangOpts().SYCLIsDevice || S.getLangOpts().CUDAIsDevice ||
1518 (S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsTargetDevice)))
1519 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1520 << "__int128";
1521 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1522 Result = Context.UnsignedInt128Ty;
1523 else
1524 Result = Context.Int128Ty;
1525 break;
1526 case DeclSpec::TST_float16:
1527 // CUDA host and device may have different _Float16 support, therefore
1528 // do not diagnose _Float16 usage to avoid false alarm.
1529 // ToDo: more precise diagnostics for CUDA.
1530 if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA &&
1531 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsTargetDevice))
1532 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1533 << "_Float16";
1534 Result = Context.Float16Ty;
1535 break;
1536 case DeclSpec::TST_half: Result = Context.HalfTy; break;
1537 case DeclSpec::TST_BFloat16:
1538 if (!S.Context.getTargetInfo().hasBFloat16Type() &&
1539 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsTargetDevice) &&
1540 !S.getLangOpts().SYCLIsDevice)
1541 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__bf16";
1542 Result = Context.BFloat16Ty;
1543 break;
1544 case DeclSpec::TST_float: Result = Context.FloatTy; break;
1545 case DeclSpec::TST_double:
1546 if (DS.getTypeSpecWidth() == TypeSpecifierWidth::Long)
1547 Result = Context.LongDoubleTy;
1548 else
1549 Result = Context.DoubleTy;
1550 if (S.getLangOpts().OpenCL) {
1551 if (!S.getOpenCLOptions().isSupported("cl_khr_fp64", S.getLangOpts()))
1552 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1553 << 0 << Result
1554 << (S.getLangOpts().getOpenCLCompatibleVersion() == 300
1555 ? "cl_khr_fp64 and __opencl_c_fp64"
1556 : "cl_khr_fp64");
1557 else if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp64", S.getLangOpts()))
1558 S.Diag(DS.getTypeSpecTypeLoc(), diag::ext_opencl_double_without_pragma);
1559 }
1560 break;
1561 case DeclSpec::TST_float128:
1562 if (!S.Context.getTargetInfo().hasFloat128Type() &&
1563 !S.getLangOpts().SYCLIsDevice &&
1564 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsTargetDevice))
1565 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1566 << "__float128";
1567 Result = Context.Float128Ty;
1568 break;
1569 case DeclSpec::TST_ibm128:
1570 if (!S.Context.getTargetInfo().hasIbm128Type() &&
1571 !S.getLangOpts().SYCLIsDevice &&
1572 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsTargetDevice))
1573 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__ibm128";
1574 Result = Context.Ibm128Ty;
1575 break;
1576 case DeclSpec::TST_bool:
1577 Result = Context.BoolTy; // _Bool or bool
1578 break;
1579 case DeclSpec::TST_decimal32: // _Decimal32
1580 case DeclSpec::TST_decimal64: // _Decimal64
1581 case DeclSpec::TST_decimal128: // _Decimal128
1582 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
1583 Result = Context.IntTy;
1584 declarator.setInvalidType(true);
1585 break;
1586 case DeclSpec::TST_class:
1587 case DeclSpec::TST_enum:
1588 case DeclSpec::TST_union:
1589 case DeclSpec::TST_struct:
1590 case DeclSpec::TST_interface: {
1591 TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl());
1592 if (!D) {
1593 // This can happen in C++ with ambiguous lookups.
1594 Result = Context.IntTy;
1595 declarator.setInvalidType(true);
1596 break;
1597 }
1598
1599 // If the type is deprecated or unavailable, diagnose it.
1600 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
1601
1602 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1603 DS.getTypeSpecComplex() == 0 &&
1604 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1605 "No qualifiers on tag names!");
1606
1607 // TypeQuals handled by caller.
1608 Result = Context.getTypeDeclType(D);
1609
1610 // In both C and C++, make an ElaboratedType.
1611 ElaboratedTypeKeyword Keyword
1612 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
1613 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result,
1614 DS.isTypeSpecOwned() ? D : nullptr);
1615 break;
1616 }
1617 case DeclSpec::TST_typename: {
1618 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1619 DS.getTypeSpecComplex() == 0 &&
1620 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1621 "Can't handle qualifiers on typedef names yet!");
1622 Result = S.GetTypeFromParser(DS.getRepAsType());
1623 if (Result.isNull()) {
1624 declarator.setInvalidType(true);
1625 }
1626
1627 // TypeQuals handled by caller.
1628 break;
1629 }
1630 case DeclSpec::TST_typeof_unqualType:
1631 case DeclSpec::TST_typeofType:
1632 // FIXME: Preserve type source info.
1633 Result = S.GetTypeFromParser(DS.getRepAsType());
1634 assert(!Result.isNull() && "Didn't get a type for typeof?");
1635 if (!Result->isDependentType())
1636 if (const TagType *TT = Result->getAs<TagType>())
1637 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1638 // TypeQuals handled by caller.
1639 Result = Context.getTypeOfType(
1640 Result, DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType
1641 ? TypeOfKind::Unqualified
1642 : TypeOfKind::Qualified);
1643 break;
1644 case DeclSpec::TST_typeof_unqualExpr:
1645 case DeclSpec::TST_typeofExpr: {
1646 Expr *E = DS.getRepAsExpr();
1647 assert(E && "Didn't get an expression for typeof?");
1648 // TypeQuals handled by caller.
1649 Result = S.BuildTypeofExprType(E, DS.getTypeSpecType() ==
1650 DeclSpec::TST_typeof_unqualExpr
1651 ? TypeOfKind::Unqualified
1652 : TypeOfKind::Qualified);
1653 if (Result.isNull()) {
1654 Result = Context.IntTy;
1655 declarator.setInvalidType(true);
1656 }
1657 break;
1658 }
1659 case DeclSpec::TST_decltype: {
1660 Expr *E = DS.getRepAsExpr();
1661 assert(E && "Didn't get an expression for decltype?");
1662 // TypeQuals handled by caller.
1663 Result = S.BuildDecltypeType(E);
1664 if (Result.isNull()) {
1665 Result = Context.IntTy;
1666 declarator.setInvalidType(true);
1667 }
1668 break;
1669 }
1670 #define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case DeclSpec::TST_##Trait:
1671 #include "clang/Basic/TransformTypeTraits.def"
1672 Result = S.GetTypeFromParser(DS.getRepAsType());
1673 assert(!Result.isNull() && "Didn't get a type for the transformation?");
1674 Result = S.BuildUnaryTransformType(
1675 Result, TSTToUnaryTransformType(DS.getTypeSpecType()),
1676 DS.getTypeSpecTypeLoc());
1677 if (Result.isNull()) {
1678 Result = Context.IntTy;
1679 declarator.setInvalidType(true);
1680 }
1681 break;
1682
1683 case DeclSpec::TST_auto:
1684 case DeclSpec::TST_decltype_auto: {
1685 auto AutoKW = DS.getTypeSpecType() == DeclSpec::TST_decltype_auto
1686 ? AutoTypeKeyword::DecltypeAuto
1687 : AutoTypeKeyword::Auto;
1688
1689 ConceptDecl *TypeConstraintConcept = nullptr;
1690 llvm::SmallVector<TemplateArgument, 8> TemplateArgs;
1691 if (DS.isConstrainedAuto()) {
1692 if (TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId()) {
1693 TypeConstraintConcept =
1694 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl());
1695 TemplateArgumentListInfo TemplateArgsInfo;
1696 TemplateArgsInfo.setLAngleLoc(TemplateId->LAngleLoc);
1697 TemplateArgsInfo.setRAngleLoc(TemplateId->RAngleLoc);
1698 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1699 TemplateId->NumArgs);
1700 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
1701 for (const auto &ArgLoc : TemplateArgsInfo.arguments())
1702 TemplateArgs.push_back(ArgLoc.getArgument());
1703 } else {
1704 declarator.setInvalidType(true);
1705 }
1706 }
1707 Result = S.Context.getAutoType(QualType(), AutoKW,
1708 /*IsDependent*/ false, /*IsPack=*/false,
1709 TypeConstraintConcept, TemplateArgs);
1710 break;
1711 }
1712
1713 case DeclSpec::TST_auto_type:
1714 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
1715 break;
1716
1717 case DeclSpec::TST_unknown_anytype:
1718 Result = Context.UnknownAnyTy;
1719 break;
1720
1721 case DeclSpec::TST_atomic:
1722 Result = S.GetTypeFromParser(DS.getRepAsType());
1723 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
1724 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1725 if (Result.isNull()) {
1726 Result = Context.IntTy;
1727 declarator.setInvalidType(true);
1728 }
1729 break;
1730
1731 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
1732 case DeclSpec::TST_##ImgType##_t: \
1733 switch (getImageAccess(DS.getAttributes())) { \
1734 case OpenCLAccessAttr::Keyword_write_only: \
1735 Result = Context.Id##WOTy; \
1736 break; \
1737 case OpenCLAccessAttr::Keyword_read_write: \
1738 Result = Context.Id##RWTy; \
1739 break; \
1740 case OpenCLAccessAttr::Keyword_read_only: \
1741 Result = Context.Id##ROTy; \
1742 break; \
1743 case OpenCLAccessAttr::SpellingNotCalculated: \
1744 llvm_unreachable("Spelling not yet calculated"); \
1745 } \
1746 break;
1747 #include "clang/Basic/OpenCLImageTypes.def"
1748
1749 case DeclSpec::TST_error:
1750 Result = Context.IntTy;
1751 declarator.setInvalidType(true);
1752 break;
1753 }
1754
1755 // FIXME: we want resulting declarations to be marked invalid, but claiming
1756 // the type is invalid is too strong - e.g. it causes ActOnTypeName to return
1757 // a null type.
1758 if (Result->containsErrors())
1759 declarator.setInvalidType();
1760
1761 if (S.getLangOpts().OpenCL) {
1762 const auto &OpenCLOptions = S.getOpenCLOptions();
1763 bool IsOpenCLC30Compatible =
1764 S.getLangOpts().getOpenCLCompatibleVersion() == 300;
1765 // OpenCL C v3.0 s6.3.3 - OpenCL image types require __opencl_c_images
1766 // support.
1767 // OpenCL C v3.0 s6.2.1 - OpenCL 3d image write types requires support
1768 // for OpenCL C 2.0, or OpenCL C 3.0 or newer and the
1769 // __opencl_c_3d_image_writes feature. OpenCL C v3.0 API s4.2 - For devices
1770 // that support OpenCL 3.0, cl_khr_3d_image_writes must be returned when and
1771 // only when the optional feature is supported
1772 if ((Result->isImageType() || Result->isSamplerT()) &&
1773 (IsOpenCLC30Compatible &&
1774 !OpenCLOptions.isSupported("__opencl_c_images", S.getLangOpts()))) {
1775 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1776 << 0 << Result << "__opencl_c_images";
1777 declarator.setInvalidType();
1778 } else if (Result->isOCLImage3dWOType() &&
1779 !OpenCLOptions.isSupported("cl_khr_3d_image_writes",
1780 S.getLangOpts())) {
1781 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1782 << 0 << Result
1783 << (IsOpenCLC30Compatible
1784 ? "cl_khr_3d_image_writes and __opencl_c_3d_image_writes"
1785 : "cl_khr_3d_image_writes");
1786 declarator.setInvalidType();
1787 }
1788 }
1789
1790 bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum ||
1791 DS.getTypeSpecType() == DeclSpec::TST_fract;
1792
1793 // Only fixed point types can be saturated
1794 if (DS.isTypeSpecSat() && !IsFixedPointType)
1795 S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec)
1796 << DS.getSpecifierName(DS.getTypeSpecType(),
1797 Context.getPrintingPolicy());
1798
1799 // Handle complex types.
1800 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1801 if (S.getLangOpts().Freestanding)
1802 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1803 Result = Context.getComplexType(Result);
1804 } else if (DS.isTypeAltiVecVector()) {
1805 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1806 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
1807 VectorKind VecKind = VectorKind::AltiVecVector;
1808 if (DS.isTypeAltiVecPixel())
1809 VecKind = VectorKind::AltiVecPixel;
1810 else if (DS.isTypeAltiVecBool())
1811 VecKind = VectorKind::AltiVecBool;
1812 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1813 }
1814
1815 // FIXME: Imaginary.
1816 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1817 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1818
1819 // Before we process any type attributes, synthesize a block literal
1820 // function declarator if necessary.
1821 if (declarator.getContext() == DeclaratorContext::BlockLiteral)
1822 maybeSynthesizeBlockSignature(state, Result);
1823
1824 // Apply any type attributes from the decl spec. This may cause the
1825 // list of type attributes to be temporarily saved while the type
1826 // attributes are pushed around.
1827 // pipe attributes will be handled later ( at GetFullTypeForDeclarator )
1828 if (!DS.isTypeSpecPipe()) {
1829 // We also apply declaration attributes that "slide" to the decl spec.
1830 // Ordering can be important for attributes. The decalaration attributes
1831 // come syntactically before the decl spec attributes, so we process them
1832 // in that order.
1833 ParsedAttributesView SlidingAttrs;
1834 for (ParsedAttr &AL : declarator.getDeclarationAttributes()) {
1835 if (AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
1836 SlidingAttrs.addAtEnd(&AL);
1837
1838 // For standard syntax attributes, which would normally appertain to the
1839 // declaration here, suggest moving them to the type instead. But only
1840 // do this for our own vendor attributes; moving other vendors'
1841 // attributes might hurt portability.
1842 // There's one special case that we need to deal with here: The
1843 // `MatrixType` attribute may only be used in a typedef declaration. If
1844 // it's being used anywhere else, don't output the warning as
1845 // ProcessDeclAttributes() will output an error anyway.
1846 if (AL.isStandardAttributeSyntax() && AL.isClangScope() &&
1847 !(AL.getKind() == ParsedAttr::AT_MatrixType &&
1848 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)) {
1849 S.Diag(AL.getLoc(), diag::warn_type_attribute_deprecated_on_decl)
1850 << AL;
1851 }
1852 }
1853 }
1854 // During this call to processTypeAttrs(),
1855 // TypeProcessingState::getCurrentAttributes() will erroneously return a
1856 // reference to the DeclSpec attributes, rather than the declaration
1857 // attributes. However, this doesn't matter, as getCurrentAttributes()
1858 // is only called when distributing attributes from one attribute list
1859 // to another. Declaration attributes are always C++11 attributes, and these
1860 // are never distributed.
1861 processTypeAttrs(state, Result, TAL_DeclSpec, SlidingAttrs);
1862 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes());
1863 }
1864
1865 // Apply const/volatile/restrict qualifiers to T.
1866 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1867 // Warn about CV qualifiers on function types.
1868 // C99 6.7.3p8:
1869 // If the specification of a function type includes any type qualifiers,
1870 // the behavior is undefined.
1871 // C++11 [dcl.fct]p7:
1872 // The effect of a cv-qualifier-seq in a function declarator is not the
1873 // same as adding cv-qualification on top of the function type. In the
1874 // latter case, the cv-qualifiers are ignored.
1875 if (Result->isFunctionType()) {
1876 diagnoseAndRemoveTypeQualifiers(
1877 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1878 S.getLangOpts().CPlusPlus
1879 ? diag::warn_typecheck_function_qualifiers_ignored
1880 : diag::warn_typecheck_function_qualifiers_unspecified);
1881 // No diagnostic for 'restrict' or '_Atomic' applied to a
1882 // function type; we'll diagnose those later, in BuildQualifiedType.
1883 }
1884
1885 // C++11 [dcl.ref]p1:
1886 // Cv-qualified references are ill-formed except when the
1887 // cv-qualifiers are introduced through the use of a typedef-name
1888 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1889 //
1890 // There don't appear to be any other contexts in which a cv-qualified
1891 // reference type could be formed, so the 'ill-formed' clause here appears
1892 // to never happen.
1893 if (TypeQuals && Result->isReferenceType()) {
1894 diagnoseAndRemoveTypeQualifiers(
1895 S, DS, TypeQuals, Result,
1896 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1897 diag::warn_typecheck_reference_qualifiers);
1898 }
1899
1900 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1901 // than once in the same specifier-list or qualifier-list, either directly
1902 // or via one or more typedefs."
1903 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1904 && TypeQuals & Result.getCVRQualifiers()) {
1905 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1906 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1907 << "const";
1908 }
1909
1910 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1911 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1912 << "volatile";
1913 }
1914
1915 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1916 // produce a warning in this case.
1917 }
1918
1919 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1920
1921 // If adding qualifiers fails, just use the unqualified type.
1922 if (Qualified.isNull())
1923 declarator.setInvalidType(true);
1924 else
1925 Result = Qualified;
1926 }
1927
1928 assert(!Result.isNull() && "This function should not return a null type");
1929 return Result;
1930 }
1931
getPrintableNameForEntity(DeclarationName Entity)1932 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1933 if (Entity)
1934 return Entity.getAsString();
1935
1936 return "type name";
1937 }
1938
isDependentOrGNUAutoType(QualType T)1939 static bool isDependentOrGNUAutoType(QualType T) {
1940 if (T->isDependentType())
1941 return true;
1942
1943 const auto *AT = dyn_cast<AutoType>(T);
1944 return AT && AT->isGNUAutoType();
1945 }
1946
BuildQualifiedType(QualType T,SourceLocation Loc,Qualifiers Qs,const DeclSpec * DS)1947 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1948 Qualifiers Qs, const DeclSpec *DS) {
1949 if (T.isNull())
1950 return QualType();
1951
1952 // Ignore any attempt to form a cv-qualified reference.
1953 if (T->isReferenceType()) {
1954 Qs.removeConst();
1955 Qs.removeVolatile();
1956 }
1957
1958 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1959 // object or incomplete types shall not be restrict-qualified."
1960 if (Qs.hasRestrict()) {
1961 unsigned DiagID = 0;
1962 QualType ProblemTy;
1963
1964 if (T->isAnyPointerType() || T->isReferenceType() ||
1965 T->isMemberPointerType()) {
1966 QualType EltTy;
1967 if (T->isObjCObjectPointerType())
1968 EltTy = T;
1969 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1970 EltTy = PTy->getPointeeType();
1971 else
1972 EltTy = T->getPointeeType();
1973
1974 // If we have a pointer or reference, the pointee must have an object
1975 // incomplete type.
1976 if (!EltTy->isIncompleteOrObjectType()) {
1977 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1978 ProblemTy = EltTy;
1979 }
1980 } else if (!isDependentOrGNUAutoType(T)) {
1981 // For an __auto_type variable, we may not have seen the initializer yet
1982 // and so have no idea whether the underlying type is a pointer type or
1983 // not.
1984 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1985 ProblemTy = T;
1986 }
1987
1988 if (DiagID) {
1989 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1990 Qs.removeRestrict();
1991 }
1992 }
1993
1994 return Context.getQualifiedType(T, Qs);
1995 }
1996
BuildQualifiedType(QualType T,SourceLocation Loc,unsigned CVRAU,const DeclSpec * DS)1997 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1998 unsigned CVRAU, const DeclSpec *DS) {
1999 if (T.isNull())
2000 return QualType();
2001
2002 // Ignore any attempt to form a cv-qualified reference.
2003 if (T->isReferenceType())
2004 CVRAU &=
2005 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);
2006
2007 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
2008 // TQ_unaligned;
2009 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);
2010
2011 // C11 6.7.3/5:
2012 // If the same qualifier appears more than once in the same
2013 // specifier-qualifier-list, either directly or via one or more typedefs,
2014 // the behavior is the same as if it appeared only once.
2015 //
2016 // It's not specified what happens when the _Atomic qualifier is applied to
2017 // a type specified with the _Atomic specifier, but we assume that this
2018 // should be treated as if the _Atomic qualifier appeared multiple times.
2019 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
2020 // C11 6.7.3/5:
2021 // If other qualifiers appear along with the _Atomic qualifier in a
2022 // specifier-qualifier-list, the resulting type is the so-qualified
2023 // atomic type.
2024 //
2025 // Don't need to worry about array types here, since _Atomic can't be
2026 // applied to such types.
2027 SplitQualType Split = T.getSplitUnqualifiedType();
2028 T = BuildAtomicType(QualType(Split.Ty, 0),
2029 DS ? DS->getAtomicSpecLoc() : Loc);
2030 if (T.isNull())
2031 return T;
2032 Split.Quals.addCVRQualifiers(CVR);
2033 return BuildQualifiedType(T, Loc, Split.Quals);
2034 }
2035
2036 Qualifiers Q = Qualifiers::fromCVRMask(CVR);
2037 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
2038 return BuildQualifiedType(T, Loc, Q, DS);
2039 }
2040
2041 /// Build a paren type including \p T.
BuildParenType(QualType T)2042 QualType Sema::BuildParenType(QualType T) {
2043 return Context.getParenType(T);
2044 }
2045
2046 /// Given that we're building a pointer or reference to the given
inferARCLifetimeForPointee(Sema & S,QualType type,SourceLocation loc,bool isReference)2047 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
2048 SourceLocation loc,
2049 bool isReference) {
2050 // Bail out if retention is unrequired or already specified.
2051 if (!type->isObjCLifetimeType() ||
2052 type.getObjCLifetime() != Qualifiers::OCL_None)
2053 return type;
2054
2055 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
2056
2057 // If the object type is const-qualified, we can safely use
2058 // __unsafe_unretained. This is safe (because there are no read
2059 // barriers), and it'll be safe to coerce anything but __weak* to
2060 // the resulting type.
2061 if (type.isConstQualified()) {
2062 implicitLifetime = Qualifiers::OCL_ExplicitNone;
2063
2064 // Otherwise, check whether the static type does not require
2065 // retaining. This currently only triggers for Class (possibly
2066 // protocol-qualifed, and arrays thereof).
2067 } else if (type->isObjCARCImplicitlyUnretainedType()) {
2068 implicitLifetime = Qualifiers::OCL_ExplicitNone;
2069
2070 // If we are in an unevaluated context, like sizeof, skip adding a
2071 // qualification.
2072 } else if (S.isUnevaluatedContext()) {
2073 return type;
2074
2075 // If that failed, give an error and recover using __strong. __strong
2076 // is the option most likely to prevent spurious second-order diagnostics,
2077 // like when binding a reference to a field.
2078 } else {
2079 // These types can show up in private ivars in system headers, so
2080 // we need this to not be an error in those cases. Instead we
2081 // want to delay.
2082 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
2083 S.DelayedDiagnostics.add(
2084 sema::DelayedDiagnostic::makeForbiddenType(loc,
2085 diag::err_arc_indirect_no_ownership, type, isReference));
2086 } else {
2087 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
2088 }
2089 implicitLifetime = Qualifiers::OCL_Strong;
2090 }
2091 assert(implicitLifetime && "didn't infer any lifetime!");
2092
2093 Qualifiers qs;
2094 qs.addObjCLifetime(implicitLifetime);
2095 return S.Context.getQualifiedType(type, qs);
2096 }
2097
getFunctionQualifiersAsString(const FunctionProtoType * FnTy)2098 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
2099 std::string Quals = FnTy->getMethodQuals().getAsString();
2100
2101 switch (FnTy->getRefQualifier()) {
2102 case RQ_None:
2103 break;
2104
2105 case RQ_LValue:
2106 if (!Quals.empty())
2107 Quals += ' ';
2108 Quals += '&';
2109 break;
2110
2111 case RQ_RValue:
2112 if (!Quals.empty())
2113 Quals += ' ';
2114 Quals += "&&";
2115 break;
2116 }
2117
2118 return Quals;
2119 }
2120
2121 namespace {
2122 /// Kinds of declarator that cannot contain a qualified function type.
2123 ///
2124 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
2125 /// a function type with a cv-qualifier or a ref-qualifier can only appear
2126 /// at the topmost level of a type.
2127 ///
2128 /// Parens and member pointers are permitted. We don't diagnose array and
2129 /// function declarators, because they don't allow function types at all.
2130 ///
2131 /// The values of this enum are used in diagnostics.
2132 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
2133 } // end anonymous namespace
2134
2135 /// Check whether the type T is a qualified function type, and if it is,
2136 /// diagnose that it cannot be contained within the given kind of declarator.
checkQualifiedFunction(Sema & S,QualType T,SourceLocation Loc,QualifiedFunctionKind QFK)2137 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
2138 QualifiedFunctionKind QFK) {
2139 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
2140 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2141 if (!FPT ||
2142 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2143 return false;
2144
2145 S.Diag(Loc, diag::err_compound_qualified_function_type)
2146 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
2147 << getFunctionQualifiersAsString(FPT);
2148 return true;
2149 }
2150
CheckQualifiedFunctionForTypeId(QualType T,SourceLocation Loc)2151 bool Sema::CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc) {
2152 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2153 if (!FPT ||
2154 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2155 return false;
2156
2157 Diag(Loc, diag::err_qualified_function_typeid)
2158 << T << getFunctionQualifiersAsString(FPT);
2159 return true;
2160 }
2161
2162 // Helper to deduce addr space of a pointee type in OpenCL mode.
deduceOpenCLPointeeAddrSpace(Sema & S,QualType PointeeType)2163 static QualType deduceOpenCLPointeeAddrSpace(Sema &S, QualType PointeeType) {
2164 if (!PointeeType->isUndeducedAutoType() && !PointeeType->isDependentType() &&
2165 !PointeeType->isSamplerT() &&
2166 !PointeeType.hasAddressSpace())
2167 PointeeType = S.getASTContext().getAddrSpaceQualType(
2168 PointeeType, S.getASTContext().getDefaultOpenCLPointeeAddrSpace());
2169 return PointeeType;
2170 }
2171
2172 /// Build a pointer type.
2173 ///
2174 /// \param T The type to which we'll be building a pointer.
2175 ///
2176 /// \param Loc The location of the entity whose type involves this
2177 /// pointer type or, if there is no such entity, the location of the
2178 /// type that will have pointer type.
2179 ///
2180 /// \param Entity The name of the entity that involves the pointer
2181 /// type, if known.
2182 ///
2183 /// \returns A suitable pointer type, if there are no
2184 /// errors. Otherwise, returns a NULL type.
BuildPointerType(QualType T,SourceLocation Loc,DeclarationName Entity)2185 QualType Sema::BuildPointerType(QualType T,
2186 SourceLocation Loc, DeclarationName Entity) {
2187 if (T->isReferenceType()) {
2188 // C++ 8.3.2p4: There shall be no ... pointers to references ...
2189 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
2190 << getPrintableNameForEntity(Entity) << T;
2191 return QualType();
2192 }
2193
2194 if (T->isFunctionType() && getLangOpts().OpenCL &&
2195 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2196 getLangOpts())) {
2197 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
2198 return QualType();
2199 }
2200
2201 if (getLangOpts().HLSL && Loc.isValid()) {
2202 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
2203 return QualType();
2204 }
2205
2206 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
2207 return QualType();
2208
2209 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
2210
2211 // In ARC, it is forbidden to build pointers to unqualified pointers.
2212 if (getLangOpts().ObjCAutoRefCount)
2213 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
2214
2215 if (getLangOpts().OpenCL)
2216 T = deduceOpenCLPointeeAddrSpace(*this, T);
2217
2218 // In WebAssembly, pointers to reference types and pointers to tables are
2219 // illegal.
2220 if (getASTContext().getTargetInfo().getTriple().isWasm()) {
2221 if (T.isWebAssemblyReferenceType()) {
2222 Diag(Loc, diag::err_wasm_reference_pr) << 0;
2223 return QualType();
2224 }
2225
2226 // We need to desugar the type here in case T is a ParenType.
2227 if (T->getUnqualifiedDesugaredType()->isWebAssemblyTableType()) {
2228 Diag(Loc, diag::err_wasm_table_pr) << 0;
2229 return QualType();
2230 }
2231 }
2232
2233 // Build the pointer type.
2234 return Context.getPointerType(T);
2235 }
2236
2237 /// Build a reference type.
2238 ///
2239 /// \param T The type to which we'll be building a reference.
2240 ///
2241 /// \param Loc The location of the entity whose type involves this
2242 /// reference type or, if there is no such entity, the location of the
2243 /// type that will have reference type.
2244 ///
2245 /// \param Entity The name of the entity that involves the reference
2246 /// type, if known.
2247 ///
2248 /// \returns A suitable reference type, if there are no
2249 /// errors. Otherwise, returns a NULL type.
BuildReferenceType(QualType T,bool SpelledAsLValue,SourceLocation Loc,DeclarationName Entity)2250 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
2251 SourceLocation Loc,
2252 DeclarationName Entity) {
2253 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
2254 "Unresolved overloaded function type");
2255
2256 // C++0x [dcl.ref]p6:
2257 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
2258 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
2259 // type T, an attempt to create the type "lvalue reference to cv TR" creates
2260 // the type "lvalue reference to T", while an attempt to create the type
2261 // "rvalue reference to cv TR" creates the type TR.
2262 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
2263
2264 // C++ [dcl.ref]p4: There shall be no references to references.
2265 //
2266 // According to C++ DR 106, references to references are only
2267 // diagnosed when they are written directly (e.g., "int & &"),
2268 // but not when they happen via a typedef:
2269 //
2270 // typedef int& intref;
2271 // typedef intref& intref2;
2272 //
2273 // Parser::ParseDeclaratorInternal diagnoses the case where
2274 // references are written directly; here, we handle the
2275 // collapsing of references-to-references as described in C++0x.
2276 // DR 106 and 540 introduce reference-collapsing into C++98/03.
2277
2278 // C++ [dcl.ref]p1:
2279 // A declarator that specifies the type "reference to cv void"
2280 // is ill-formed.
2281 if (T->isVoidType()) {
2282 Diag(Loc, diag::err_reference_to_void);
2283 return QualType();
2284 }
2285
2286 if (getLangOpts().HLSL && Loc.isValid()) {
2287 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 1;
2288 return QualType();
2289 }
2290
2291 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
2292 return QualType();
2293
2294 if (T->isFunctionType() && getLangOpts().OpenCL &&
2295 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2296 getLangOpts())) {
2297 Diag(Loc, diag::err_opencl_function_pointer) << /*reference*/ 1;
2298 return QualType();
2299 }
2300
2301 // In ARC, it is forbidden to build references to unqualified pointers.
2302 if (getLangOpts().ObjCAutoRefCount)
2303 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
2304
2305 if (getLangOpts().OpenCL)
2306 T = deduceOpenCLPointeeAddrSpace(*this, T);
2307
2308 // In WebAssembly, references to reference types and tables are illegal.
2309 if (getASTContext().getTargetInfo().getTriple().isWasm() &&
2310 T.isWebAssemblyReferenceType()) {
2311 Diag(Loc, diag::err_wasm_reference_pr) << 1;
2312 return QualType();
2313 }
2314 if (T->isWebAssemblyTableType()) {
2315 Diag(Loc, diag::err_wasm_table_pr) << 1;
2316 return QualType();
2317 }
2318
2319 // Handle restrict on references.
2320 if (LValueRef)
2321 return Context.getLValueReferenceType(T, SpelledAsLValue);
2322 return Context.getRValueReferenceType(T);
2323 }
2324
2325 /// Build a Read-only Pipe type.
2326 ///
2327 /// \param T The type to which we'll be building a Pipe.
2328 ///
2329 /// \param Loc We do not use it for now.
2330 ///
2331 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2332 /// NULL type.
BuildReadPipeType(QualType T,SourceLocation Loc)2333 QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
2334 return Context.getReadPipeType(T);
2335 }
2336
2337 /// Build a Write-only Pipe type.
2338 ///
2339 /// \param T The type to which we'll be building a Pipe.
2340 ///
2341 /// \param Loc We do not use it for now.
2342 ///
2343 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2344 /// NULL type.
BuildWritePipeType(QualType T,SourceLocation Loc)2345 QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
2346 return Context.getWritePipeType(T);
2347 }
2348
2349 /// Build a bit-precise integer type.
2350 ///
2351 /// \param IsUnsigned Boolean representing the signedness of the type.
2352 ///
2353 /// \param BitWidth Size of this int type in bits, or an expression representing
2354 /// that.
2355 ///
2356 /// \param Loc Location of the keyword.
BuildBitIntType(bool IsUnsigned,Expr * BitWidth,SourceLocation Loc)2357 QualType Sema::BuildBitIntType(bool IsUnsigned, Expr *BitWidth,
2358 SourceLocation Loc) {
2359 if (BitWidth->isInstantiationDependent())
2360 return Context.getDependentBitIntType(IsUnsigned, BitWidth);
2361
2362 llvm::APSInt Bits(32);
2363 ExprResult ICE =
2364 VerifyIntegerConstantExpression(BitWidth, &Bits, /*FIXME*/ AllowFold);
2365
2366 if (ICE.isInvalid())
2367 return QualType();
2368
2369 size_t NumBits = Bits.getZExtValue();
2370 if (!IsUnsigned && NumBits < 2) {
2371 Diag(Loc, diag::err_bit_int_bad_size) << 0;
2372 return QualType();
2373 }
2374
2375 if (IsUnsigned && NumBits < 1) {
2376 Diag(Loc, diag::err_bit_int_bad_size) << 1;
2377 return QualType();
2378 }
2379
2380 const TargetInfo &TI = getASTContext().getTargetInfo();
2381 if (NumBits > TI.getMaxBitIntWidth()) {
2382 Diag(Loc, diag::err_bit_int_max_size)
2383 << IsUnsigned << static_cast<uint64_t>(TI.getMaxBitIntWidth());
2384 return QualType();
2385 }
2386
2387 return Context.getBitIntType(IsUnsigned, NumBits);
2388 }
2389
2390 /// Check whether the specified array bound can be evaluated using the relevant
2391 /// language rules. If so, returns the possibly-converted expression and sets
2392 /// SizeVal to the size. If not, but the expression might be a VLA bound,
2393 /// returns ExprResult(). Otherwise, produces a diagnostic and returns
2394 /// ExprError().
checkArraySize(Sema & S,Expr * & ArraySize,llvm::APSInt & SizeVal,unsigned VLADiag,bool VLAIsError)2395 static ExprResult checkArraySize(Sema &S, Expr *&ArraySize,
2396 llvm::APSInt &SizeVal, unsigned VLADiag,
2397 bool VLAIsError) {
2398 if (S.getLangOpts().CPlusPlus14 &&
2399 (VLAIsError ||
2400 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType())) {
2401 // C++14 [dcl.array]p1:
2402 // The constant-expression shall be a converted constant expression of
2403 // type std::size_t.
2404 //
2405 // Don't apply this rule if we might be forming a VLA: in that case, we
2406 // allow non-constant expressions and constant-folding. We only need to use
2407 // the converted constant expression rules (to properly convert the source)
2408 // when the source expression is of class type.
2409 return S.CheckConvertedConstantExpression(
2410 ArraySize, S.Context.getSizeType(), SizeVal, Sema::CCEK_ArrayBound);
2411 }
2412
2413 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
2414 // (like gnu99, but not c99) accept any evaluatable value as an extension.
2415 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
2416 public:
2417 unsigned VLADiag;
2418 bool VLAIsError;
2419 bool IsVLA = false;
2420
2421 VLADiagnoser(unsigned VLADiag, bool VLAIsError)
2422 : VLADiag(VLADiag), VLAIsError(VLAIsError) {}
2423
2424 Sema::SemaDiagnosticBuilder diagnoseNotICEType(Sema &S, SourceLocation Loc,
2425 QualType T) override {
2426 return S.Diag(Loc, diag::err_array_size_non_int) << T;
2427 }
2428
2429 Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S,
2430 SourceLocation Loc) override {
2431 IsVLA = !VLAIsError;
2432 return S.Diag(Loc, VLADiag);
2433 }
2434
2435 Sema::SemaDiagnosticBuilder diagnoseFold(Sema &S,
2436 SourceLocation Loc) override {
2437 return S.Diag(Loc, diag::ext_vla_folded_to_constant);
2438 }
2439 } Diagnoser(VLADiag, VLAIsError);
2440
2441 ExprResult R =
2442 S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser);
2443 if (Diagnoser.IsVLA)
2444 return ExprResult();
2445 return R;
2446 }
2447
checkArrayElementAlignment(QualType EltTy,SourceLocation Loc)2448 bool Sema::checkArrayElementAlignment(QualType EltTy, SourceLocation Loc) {
2449 EltTy = Context.getBaseElementType(EltTy);
2450 if (EltTy->isIncompleteType() || EltTy->isDependentType() ||
2451 EltTy->isUndeducedType())
2452 return true;
2453
2454 CharUnits Size = Context.getTypeSizeInChars(EltTy);
2455 CharUnits Alignment = Context.getTypeAlignInChars(EltTy);
2456
2457 if (Size.isMultipleOf(Alignment))
2458 return true;
2459
2460 Diag(Loc, diag::err_array_element_alignment)
2461 << EltTy << Size.getQuantity() << Alignment.getQuantity();
2462 return false;
2463 }
2464
2465 /// Build an array type.
2466 ///
2467 /// \param T The type of each element in the array.
2468 ///
2469 /// \param ASM C99 array size modifier (e.g., '*', 'static').
2470 ///
2471 /// \param ArraySize Expression describing the size of the array.
2472 ///
2473 /// \param Brackets The range from the opening '[' to the closing ']'.
2474 ///
2475 /// \param Entity The name of the entity that involves the array
2476 /// type, if known.
2477 ///
2478 /// \returns A suitable array type, if there are no errors. Otherwise,
2479 /// returns a NULL type.
BuildArrayType(QualType T,ArraySizeModifier ASM,Expr * ArraySize,unsigned Quals,SourceRange Brackets,DeclarationName Entity)2480 QualType Sema::BuildArrayType(QualType T, ArraySizeModifier ASM,
2481 Expr *ArraySize, unsigned Quals,
2482 SourceRange Brackets, DeclarationName Entity) {
2483
2484 SourceLocation Loc = Brackets.getBegin();
2485 if (getLangOpts().CPlusPlus) {
2486 // C++ [dcl.array]p1:
2487 // T is called the array element type; this type shall not be a reference
2488 // type, the (possibly cv-qualified) type void, a function type or an
2489 // abstract class type.
2490 //
2491 // C++ [dcl.array]p3:
2492 // When several "array of" specifications are adjacent, [...] only the
2493 // first of the constant expressions that specify the bounds of the arrays
2494 // may be omitted.
2495 //
2496 // Note: function types are handled in the common path with C.
2497 if (T->isReferenceType()) {
2498 Diag(Loc, diag::err_illegal_decl_array_of_references)
2499 << getPrintableNameForEntity(Entity) << T;
2500 return QualType();
2501 }
2502
2503 if (T->isVoidType() || T->isIncompleteArrayType()) {
2504 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 0 << T;
2505 return QualType();
2506 }
2507
2508 if (RequireNonAbstractType(Brackets.getBegin(), T,
2509 diag::err_array_of_abstract_type))
2510 return QualType();
2511
2512 // Mentioning a member pointer type for an array type causes us to lock in
2513 // an inheritance model, even if it's inside an unused typedef.
2514 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
2515 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
2516 if (!MPTy->getClass()->isDependentType())
2517 (void)isCompleteType(Loc, T);
2518
2519 } else {
2520 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
2521 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
2522 if (!T.isWebAssemblyReferenceType() &&
2523 RequireCompleteSizedType(Loc, T,
2524 diag::err_array_incomplete_or_sizeless_type))
2525 return QualType();
2526 }
2527
2528 // Multi-dimensional arrays of WebAssembly references are not allowed.
2529 if (Context.getTargetInfo().getTriple().isWasm() && T->isArrayType()) {
2530 const auto *ATy = dyn_cast<ArrayType>(T);
2531 if (ATy && ATy->getElementType().isWebAssemblyReferenceType()) {
2532 Diag(Loc, diag::err_wasm_reftype_multidimensional_array);
2533 return QualType();
2534 }
2535 }
2536
2537 if (T->isSizelessType() && !T.isWebAssemblyReferenceType()) {
2538 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 1 << T;
2539 return QualType();
2540 }
2541
2542 if (T->isFunctionType()) {
2543 Diag(Loc, diag::err_illegal_decl_array_of_functions)
2544 << getPrintableNameForEntity(Entity) << T;
2545 return QualType();
2546 }
2547
2548 if (const RecordType *EltTy = T->getAs<RecordType>()) {
2549 // If the element type is a struct or union that contains a variadic
2550 // array, accept it as a GNU extension: C99 6.7.2.1p2.
2551 if (EltTy->getDecl()->hasFlexibleArrayMember())
2552 Diag(Loc, diag::ext_flexible_array_in_array) << T;
2553 } else if (T->isObjCObjectType()) {
2554 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
2555 return QualType();
2556 }
2557
2558 if (!checkArrayElementAlignment(T, Loc))
2559 return QualType();
2560
2561 // Do placeholder conversions on the array size expression.
2562 if (ArraySize && ArraySize->hasPlaceholderType()) {
2563 ExprResult Result = CheckPlaceholderExpr(ArraySize);
2564 if (Result.isInvalid()) return QualType();
2565 ArraySize = Result.get();
2566 }
2567
2568 // Do lvalue-to-rvalue conversions on the array size expression.
2569 if (ArraySize && !ArraySize->isPRValue()) {
2570 ExprResult Result = DefaultLvalueConversion(ArraySize);
2571 if (Result.isInvalid())
2572 return QualType();
2573
2574 ArraySize = Result.get();
2575 }
2576
2577 // C99 6.7.5.2p1: The size expression shall have integer type.
2578 // C++11 allows contextual conversions to such types.
2579 if (!getLangOpts().CPlusPlus11 &&
2580 ArraySize && !ArraySize->isTypeDependent() &&
2581 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2582 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
2583 << ArraySize->getType() << ArraySize->getSourceRange();
2584 return QualType();
2585 }
2586
2587 auto IsStaticAssertLike = [](const Expr *ArraySize, ASTContext &Context) {
2588 if (!ArraySize)
2589 return false;
2590
2591 // If the array size expression is a conditional expression whose branches
2592 // are both integer constant expressions, one negative and one positive,
2593 // then it's assumed to be like an old-style static assertion. e.g.,
2594 // int old_style_assert[expr ? 1 : -1];
2595 // We will accept any integer constant expressions instead of assuming the
2596 // values 1 and -1 are always used.
2597 if (const auto *CondExpr = dyn_cast_if_present<ConditionalOperator>(
2598 ArraySize->IgnoreParenImpCasts())) {
2599 std::optional<llvm::APSInt> LHS =
2600 CondExpr->getLHS()->getIntegerConstantExpr(Context);
2601 std::optional<llvm::APSInt> RHS =
2602 CondExpr->getRHS()->getIntegerConstantExpr(Context);
2603 return LHS && RHS && LHS->isNegative() != RHS->isNegative();
2604 }
2605 return false;
2606 };
2607
2608 // VLAs always produce at least a -Wvla diagnostic, sometimes an error.
2609 unsigned VLADiag;
2610 bool VLAIsError;
2611 if (getLangOpts().OpenCL) {
2612 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
2613 VLADiag = diag::err_opencl_vla;
2614 VLAIsError = true;
2615 } else if (getLangOpts().C99) {
2616 VLADiag = diag::warn_vla_used;
2617 VLAIsError = false;
2618 } else if (isSFINAEContext()) {
2619 VLADiag = diag::err_vla_in_sfinae;
2620 VLAIsError = true;
2621 } else if (getLangOpts().OpenMP && isInOpenMPTaskUntiedContext()) {
2622 VLADiag = diag::err_openmp_vla_in_task_untied;
2623 VLAIsError = true;
2624 } else if (getLangOpts().CPlusPlus) {
2625 if (getLangOpts().CPlusPlus11 && IsStaticAssertLike(ArraySize, Context))
2626 VLADiag = getLangOpts().GNUMode
2627 ? diag::ext_vla_cxx_in_gnu_mode_static_assert
2628 : diag::ext_vla_cxx_static_assert;
2629 else
2630 VLADiag = getLangOpts().GNUMode ? diag::ext_vla_cxx_in_gnu_mode
2631 : diag::ext_vla_cxx;
2632 VLAIsError = false;
2633 } else {
2634 VLADiag = diag::ext_vla;
2635 VLAIsError = false;
2636 }
2637
2638 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
2639 if (!ArraySize) {
2640 if (ASM == ArraySizeModifier::Star) {
2641 Diag(Loc, VLADiag);
2642 if (VLAIsError)
2643 return QualType();
2644
2645 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
2646 } else {
2647 T = Context.getIncompleteArrayType(T, ASM, Quals);
2648 }
2649 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
2650 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
2651 } else {
2652 ExprResult R =
2653 checkArraySize(*this, ArraySize, ConstVal, VLADiag, VLAIsError);
2654 if (R.isInvalid())
2655 return QualType();
2656
2657 if (!R.isUsable()) {
2658 // C99: an array with a non-ICE size is a VLA. We accept any expression
2659 // that we can fold to a non-zero positive value as a non-VLA as an
2660 // extension.
2661 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2662 } else if (!T->isDependentType() && !T->isIncompleteType() &&
2663 !T->isConstantSizeType()) {
2664 // C99: an array with an element type that has a non-constant-size is a
2665 // VLA.
2666 // FIXME: Add a note to explain why this isn't a VLA.
2667 Diag(Loc, VLADiag);
2668 if (VLAIsError)
2669 return QualType();
2670 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2671 } else {
2672 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
2673 // have a value greater than zero.
2674 // In C++, this follows from narrowing conversions being disallowed.
2675 if (ConstVal.isSigned() && ConstVal.isNegative()) {
2676 if (Entity)
2677 Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size)
2678 << getPrintableNameForEntity(Entity)
2679 << ArraySize->getSourceRange();
2680 else
2681 Diag(ArraySize->getBeginLoc(),
2682 diag::err_typecheck_negative_array_size)
2683 << ArraySize->getSourceRange();
2684 return QualType();
2685 }
2686 if (ConstVal == 0 && !T.isWebAssemblyReferenceType()) {
2687 // GCC accepts zero sized static arrays. We allow them when
2688 // we're not in a SFINAE context.
2689 Diag(ArraySize->getBeginLoc(),
2690 isSFINAEContext() ? diag::err_typecheck_zero_array_size
2691 : diag::ext_typecheck_zero_array_size)
2692 << 0 << ArraySize->getSourceRange();
2693 }
2694
2695 // Is the array too large?
2696 unsigned ActiveSizeBits =
2697 (!T->isDependentType() && !T->isVariablyModifiedType() &&
2698 !T->isIncompleteType() && !T->isUndeducedType())
2699 ? ConstantArrayType::getNumAddressingBits(Context, T, ConstVal)
2700 : ConstVal.getActiveBits();
2701 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2702 Diag(ArraySize->getBeginLoc(), diag::err_array_too_large)
2703 << toString(ConstVal, 10) << ArraySize->getSourceRange();
2704 return QualType();
2705 }
2706
2707 T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
2708 }
2709 }
2710
2711 if (T->isVariableArrayType()) {
2712 if (!Context.getTargetInfo().isVLASupported()) {
2713 // CUDA device code and some other targets don't support VLAs.
2714 bool IsCUDADevice = (getLangOpts().CUDA && getLangOpts().CUDAIsDevice);
2715 targetDiag(Loc,
2716 IsCUDADevice ? diag::err_cuda_vla : diag::err_vla_unsupported)
2717 << (IsCUDADevice ? CurrentCUDATarget() : 0);
2718 } else if (sema::FunctionScopeInfo *FSI = getCurFunction()) {
2719 // VLAs are supported on this target, but we may need to do delayed
2720 // checking that the VLA is not being used within a coroutine.
2721 FSI->setHasVLA(Loc);
2722 }
2723 }
2724
2725 // If this is not C99, diagnose array size modifiers on non-VLAs.
2726 if (!getLangOpts().C99 && !T->isVariableArrayType() &&
2727 (ASM != ArraySizeModifier::Normal || Quals != 0)) {
2728 Diag(Loc, getLangOpts().CPlusPlus ? diag::err_c99_array_usage_cxx
2729 : diag::ext_c99_array_usage)
2730 << llvm::to_underlying(ASM);
2731 }
2732
2733 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
2734 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
2735 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
2736 if (getLangOpts().OpenCL) {
2737 const QualType ArrType = Context.getBaseElementType(T);
2738 if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
2739 ArrType->isSamplerT() || ArrType->isImageType()) {
2740 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
2741 return QualType();
2742 }
2743 }
2744
2745 return T;
2746 }
2747
BuildVectorType(QualType CurType,Expr * SizeExpr,SourceLocation AttrLoc)2748 QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr,
2749 SourceLocation AttrLoc) {
2750 // The base type must be integer (not Boolean or enumeration) or float, and
2751 // can't already be a vector.
2752 if ((!CurType->isDependentType() &&
2753 (!CurType->isBuiltinType() || CurType->isBooleanType() ||
2754 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) &&
2755 !CurType->isBitIntType()) ||
2756 CurType->isArrayType()) {
2757 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType;
2758 return QualType();
2759 }
2760 // Only support _BitInt elements with byte-sized power of 2 NumBits.
2761 if (const auto *BIT = CurType->getAs<BitIntType>()) {
2762 unsigned NumBits = BIT->getNumBits();
2763 if (!llvm::isPowerOf2_32(NumBits) || NumBits < 8) {
2764 Diag(AttrLoc, diag::err_attribute_invalid_bitint_vector_type)
2765 << (NumBits < 8);
2766 return QualType();
2767 }
2768 }
2769
2770 if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent())
2771 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2772 VectorKind::Generic);
2773
2774 std::optional<llvm::APSInt> VecSize =
2775 SizeExpr->getIntegerConstantExpr(Context);
2776 if (!VecSize) {
2777 Diag(AttrLoc, diag::err_attribute_argument_type)
2778 << "vector_size" << AANT_ArgumentIntegerConstant
2779 << SizeExpr->getSourceRange();
2780 return QualType();
2781 }
2782
2783 if (CurType->isDependentType())
2784 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2785 VectorKind::Generic);
2786
2787 // vecSize is specified in bytes - convert to bits.
2788 if (!VecSize->isIntN(61)) {
2789 // Bit size will overflow uint64.
2790 Diag(AttrLoc, diag::err_attribute_size_too_large)
2791 << SizeExpr->getSourceRange() << "vector";
2792 return QualType();
2793 }
2794 uint64_t VectorSizeBits = VecSize->getZExtValue() * 8;
2795 unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType));
2796
2797 if (VectorSizeBits == 0) {
2798 Diag(AttrLoc, diag::err_attribute_zero_size)
2799 << SizeExpr->getSourceRange() << "vector";
2800 return QualType();
2801 }
2802
2803 if (!TypeSize || VectorSizeBits % TypeSize) {
2804 Diag(AttrLoc, diag::err_attribute_invalid_size)
2805 << SizeExpr->getSourceRange();
2806 return QualType();
2807 }
2808
2809 if (VectorSizeBits / TypeSize > std::numeric_limits<uint32_t>::max()) {
2810 Diag(AttrLoc, diag::err_attribute_size_too_large)
2811 << SizeExpr->getSourceRange() << "vector";
2812 return QualType();
2813 }
2814
2815 return Context.getVectorType(CurType, VectorSizeBits / TypeSize,
2816 VectorKind::Generic);
2817 }
2818
2819 /// Build an ext-vector type.
2820 ///
2821 /// Run the required checks for the extended vector type.
BuildExtVectorType(QualType T,Expr * ArraySize,SourceLocation AttrLoc)2822 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
2823 SourceLocation AttrLoc) {
2824 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined
2825 // in conjunction with complex types (pointers, arrays, functions, etc.).
2826 //
2827 // Additionally, OpenCL prohibits vectors of booleans (they're considered a
2828 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
2829 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
2830 // of bool aren't allowed.
2831 //
2832 // We explictly allow bool elements in ext_vector_type for C/C++.
2833 bool IsNoBoolVecLang = getLangOpts().OpenCL || getLangOpts().OpenCLCPlusPlus;
2834 if ((!T->isDependentType() && !T->isIntegerType() &&
2835 !T->isRealFloatingType()) ||
2836 (IsNoBoolVecLang && T->isBooleanType())) {
2837 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
2838 return QualType();
2839 }
2840
2841 // Only support _BitInt elements with byte-sized power of 2 NumBits.
2842 if (T->isBitIntType()) {
2843 unsigned NumBits = T->castAs<BitIntType>()->getNumBits();
2844 if (!llvm::isPowerOf2_32(NumBits) || NumBits < 8) {
2845 Diag(AttrLoc, diag::err_attribute_invalid_bitint_vector_type)
2846 << (NumBits < 8);
2847 return QualType();
2848 }
2849 }
2850
2851 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
2852 std::optional<llvm::APSInt> vecSize =
2853 ArraySize->getIntegerConstantExpr(Context);
2854 if (!vecSize) {
2855 Diag(AttrLoc, diag::err_attribute_argument_type)
2856 << "ext_vector_type" << AANT_ArgumentIntegerConstant
2857 << ArraySize->getSourceRange();
2858 return QualType();
2859 }
2860
2861 if (!vecSize->isIntN(32)) {
2862 Diag(AttrLoc, diag::err_attribute_size_too_large)
2863 << ArraySize->getSourceRange() << "vector";
2864 return QualType();
2865 }
2866 // Unlike gcc's vector_size attribute, the size is specified as the
2867 // number of elements, not the number of bytes.
2868 unsigned vectorSize = static_cast<unsigned>(vecSize->getZExtValue());
2869
2870 if (vectorSize == 0) {
2871 Diag(AttrLoc, diag::err_attribute_zero_size)
2872 << ArraySize->getSourceRange() << "vector";
2873 return QualType();
2874 }
2875
2876 return Context.getExtVectorType(T, vectorSize);
2877 }
2878
2879 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2880 }
2881
BuildMatrixType(QualType ElementTy,Expr * NumRows,Expr * NumCols,SourceLocation AttrLoc)2882 QualType Sema::BuildMatrixType(QualType ElementTy, Expr *NumRows, Expr *NumCols,
2883 SourceLocation AttrLoc) {
2884 assert(Context.getLangOpts().MatrixTypes &&
2885 "Should never build a matrix type when it is disabled");
2886
2887 // Check element type, if it is not dependent.
2888 if (!ElementTy->isDependentType() &&
2889 !MatrixType::isValidElementType(ElementTy)) {
2890 Diag(AttrLoc, diag::err_attribute_invalid_matrix_type) << ElementTy;
2891 return QualType();
2892 }
2893
2894 if (NumRows->isTypeDependent() || NumCols->isTypeDependent() ||
2895 NumRows->isValueDependent() || NumCols->isValueDependent())
2896 return Context.getDependentSizedMatrixType(ElementTy, NumRows, NumCols,
2897 AttrLoc);
2898
2899 std::optional<llvm::APSInt> ValueRows =
2900 NumRows->getIntegerConstantExpr(Context);
2901 std::optional<llvm::APSInt> ValueColumns =
2902 NumCols->getIntegerConstantExpr(Context);
2903
2904 auto const RowRange = NumRows->getSourceRange();
2905 auto const ColRange = NumCols->getSourceRange();
2906
2907 // Both are row and column expressions are invalid.
2908 if (!ValueRows && !ValueColumns) {
2909 Diag(AttrLoc, diag::err_attribute_argument_type)
2910 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange
2911 << ColRange;
2912 return QualType();
2913 }
2914
2915 // Only the row expression is invalid.
2916 if (!ValueRows) {
2917 Diag(AttrLoc, diag::err_attribute_argument_type)
2918 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange;
2919 return QualType();
2920 }
2921
2922 // Only the column expression is invalid.
2923 if (!ValueColumns) {
2924 Diag(AttrLoc, diag::err_attribute_argument_type)
2925 << "matrix_type" << AANT_ArgumentIntegerConstant << ColRange;
2926 return QualType();
2927 }
2928
2929 // Check the matrix dimensions.
2930 unsigned MatrixRows = static_cast<unsigned>(ValueRows->getZExtValue());
2931 unsigned MatrixColumns = static_cast<unsigned>(ValueColumns->getZExtValue());
2932 if (MatrixRows == 0 && MatrixColumns == 0) {
2933 Diag(AttrLoc, diag::err_attribute_zero_size)
2934 << "matrix" << RowRange << ColRange;
2935 return QualType();
2936 }
2937 if (MatrixRows == 0) {
2938 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << RowRange;
2939 return QualType();
2940 }
2941 if (MatrixColumns == 0) {
2942 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << ColRange;
2943 return QualType();
2944 }
2945 if (!ConstantMatrixType::isDimensionValid(MatrixRows)) {
2946 Diag(AttrLoc, diag::err_attribute_size_too_large)
2947 << RowRange << "matrix row";
2948 return QualType();
2949 }
2950 if (!ConstantMatrixType::isDimensionValid(MatrixColumns)) {
2951 Diag(AttrLoc, diag::err_attribute_size_too_large)
2952 << ColRange << "matrix column";
2953 return QualType();
2954 }
2955 return Context.getConstantMatrixType(ElementTy, MatrixRows, MatrixColumns);
2956 }
2957
CheckFunctionReturnType(QualType T,SourceLocation Loc)2958 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
2959 if (T->isArrayType() || T->isFunctionType()) {
2960 Diag(Loc, diag::err_func_returning_array_function)
2961 << T->isFunctionType() << T;
2962 return true;
2963 }
2964
2965 // Functions cannot return half FP.
2966 if (T->isHalfType() && !getLangOpts().NativeHalfArgsAndReturns &&
2967 !Context.getTargetInfo().allowHalfArgsAndReturns()) {
2968 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
2969 FixItHint::CreateInsertion(Loc, "*");
2970 return true;
2971 }
2972
2973 // Methods cannot return interface types. All ObjC objects are
2974 // passed by reference.
2975 if (T->isObjCObjectType()) {
2976 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
2977 << 0 << T << FixItHint::CreateInsertion(Loc, "*");
2978 return true;
2979 }
2980
2981 if (T.hasNonTrivialToPrimitiveDestructCUnion() ||
2982 T.hasNonTrivialToPrimitiveCopyCUnion())
2983 checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn,
2984 NTCUK_Destruct|NTCUK_Copy);
2985
2986 // C++2a [dcl.fct]p12:
2987 // A volatile-qualified return type is deprecated
2988 if (T.isVolatileQualified() && getLangOpts().CPlusPlus20)
2989 Diag(Loc, diag::warn_deprecated_volatile_return) << T;
2990
2991 if (T.getAddressSpace() != LangAS::Default && getLangOpts().HLSL)
2992 return true;
2993 return false;
2994 }
2995
2996 /// Check the extended parameter information. Most of the necessary
2997 /// checking should occur when applying the parameter attribute; the
2998 /// only other checks required are positional restrictions.
checkExtParameterInfos(Sema & S,ArrayRef<QualType> paramTypes,const FunctionProtoType::ExtProtoInfo & EPI,llvm::function_ref<SourceLocation (unsigned)> getParamLoc)2999 static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
3000 const FunctionProtoType::ExtProtoInfo &EPI,
3001 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
3002 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos");
3003
3004 bool emittedError = false;
3005 auto actualCC = EPI.ExtInfo.getCC();
3006 enum class RequiredCC { OnlySwift, SwiftOrSwiftAsync };
3007 auto checkCompatible = [&](unsigned paramIndex, RequiredCC required) {
3008 bool isCompatible =
3009 (required == RequiredCC::OnlySwift)
3010 ? (actualCC == CC_Swift)
3011 : (actualCC == CC_Swift || actualCC == CC_SwiftAsync);
3012 if (isCompatible || emittedError)
3013 return;
3014 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
3015 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI())
3016 << (required == RequiredCC::OnlySwift);
3017 emittedError = true;
3018 };
3019 for (size_t paramIndex = 0, numParams = paramTypes.size();
3020 paramIndex != numParams; ++paramIndex) {
3021 switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
3022 // Nothing interesting to check for orindary-ABI parameters.
3023 case ParameterABI::Ordinary:
3024 continue;
3025
3026 // swift_indirect_result parameters must be a prefix of the function
3027 // arguments.
3028 case ParameterABI::SwiftIndirectResult:
3029 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
3030 if (paramIndex != 0 &&
3031 EPI.ExtParameterInfos[paramIndex - 1].getABI()
3032 != ParameterABI::SwiftIndirectResult) {
3033 S.Diag(getParamLoc(paramIndex),
3034 diag::err_swift_indirect_result_not_first);
3035 }
3036 continue;
3037
3038 case ParameterABI::SwiftContext:
3039 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
3040 continue;
3041
3042 // SwiftAsyncContext is not limited to swiftasynccall functions.
3043 case ParameterABI::SwiftAsyncContext:
3044 continue;
3045
3046 // swift_error parameters must be preceded by a swift_context parameter.
3047 case ParameterABI::SwiftErrorResult:
3048 checkCompatible(paramIndex, RequiredCC::OnlySwift);
3049 if (paramIndex == 0 ||
3050 EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
3051 ParameterABI::SwiftContext) {
3052 S.Diag(getParamLoc(paramIndex),
3053 diag::err_swift_error_result_not_after_swift_context);
3054 }
3055 continue;
3056 }
3057 llvm_unreachable("bad ABI kind");
3058 }
3059 }
3060
BuildFunctionType(QualType T,MutableArrayRef<QualType> ParamTypes,SourceLocation Loc,DeclarationName Entity,const FunctionProtoType::ExtProtoInfo & EPI)3061 QualType Sema::BuildFunctionType(QualType T,
3062 MutableArrayRef<QualType> ParamTypes,
3063 SourceLocation Loc, DeclarationName Entity,
3064 const FunctionProtoType::ExtProtoInfo &EPI) {
3065 bool Invalid = false;
3066
3067 Invalid |= CheckFunctionReturnType(T, Loc);
3068
3069 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
3070 // FIXME: Loc is too inprecise here, should use proper locations for args.
3071 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
3072 if (ParamType->isVoidType()) {
3073 Diag(Loc, diag::err_param_with_void_type);
3074 Invalid = true;
3075 } else if (ParamType->isHalfType() && !getLangOpts().NativeHalfArgsAndReturns &&
3076 !Context.getTargetInfo().allowHalfArgsAndReturns()) {
3077 // Disallow half FP arguments.
3078 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
3079 FixItHint::CreateInsertion(Loc, "*");
3080 Invalid = true;
3081 } else if (ParamType->isWebAssemblyTableType()) {
3082 Diag(Loc, diag::err_wasm_table_as_function_parameter);
3083 Invalid = true;
3084 }
3085
3086 // C++2a [dcl.fct]p4:
3087 // A parameter with volatile-qualified type is deprecated
3088 if (ParamType.isVolatileQualified() && getLangOpts().CPlusPlus20)
3089 Diag(Loc, diag::warn_deprecated_volatile_param) << ParamType;
3090
3091 ParamTypes[Idx] = ParamType;
3092 }
3093
3094 if (EPI.ExtParameterInfos) {
3095 checkExtParameterInfos(*this, ParamTypes, EPI,
3096 [=](unsigned i) { return Loc; });
3097 }
3098
3099 if (EPI.ExtInfo.getProducesResult()) {
3100 // This is just a warning, so we can't fail to build if we see it.
3101 checkNSReturnsRetainedReturnType(Loc, T);
3102 }
3103
3104 if (Invalid)
3105 return QualType();
3106
3107 return Context.getFunctionType(T, ParamTypes, EPI);
3108 }
3109
3110 /// Build a member pointer type \c T Class::*.
3111 ///
3112 /// \param T the type to which the member pointer refers.
3113 /// \param Class the class type into which the member pointer points.
3114 /// \param Loc the location where this type begins
3115 /// \param Entity the name of the entity that will have this member pointer type
3116 ///
3117 /// \returns a member pointer type, if successful, or a NULL type if there was
3118 /// an error.
BuildMemberPointerType(QualType T,QualType Class,SourceLocation Loc,DeclarationName Entity)3119 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
3120 SourceLocation Loc,
3121 DeclarationName Entity) {
3122 // Verify that we're not building a pointer to pointer to function with
3123 // exception specification.
3124 if (CheckDistantExceptionSpec(T)) {
3125 Diag(Loc, diag::err_distant_exception_spec);
3126 return QualType();
3127 }
3128
3129 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
3130 // with reference type, or "cv void."
3131 if (T->isReferenceType()) {
3132 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
3133 << getPrintableNameForEntity(Entity) << T;
3134 return QualType();
3135 }
3136
3137 if (T->isVoidType()) {
3138 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
3139 << getPrintableNameForEntity(Entity);
3140 return QualType();
3141 }
3142
3143 if (!Class->isDependentType() && !Class->isRecordType()) {
3144 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
3145 return QualType();
3146 }
3147
3148 if (T->isFunctionType() && getLangOpts().OpenCL &&
3149 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
3150 getLangOpts())) {
3151 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
3152 return QualType();
3153 }
3154
3155 if (getLangOpts().HLSL && Loc.isValid()) {
3156 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
3157 return QualType();
3158 }
3159
3160 // Adjust the default free function calling convention to the default method
3161 // calling convention.
3162 bool IsCtorOrDtor =
3163 (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
3164 (Entity.getNameKind() == DeclarationName::CXXDestructorName);
3165 if (T->isFunctionType())
3166 adjustMemberFunctionCC(T, /*HasThisPointer=*/true, IsCtorOrDtor, Loc);
3167
3168 return Context.getMemberPointerType(T, Class.getTypePtr());
3169 }
3170
3171 /// Build a block pointer type.
3172 ///
3173 /// \param T The type to which we'll be building a block pointer.
3174 ///
3175 /// \param Loc The source location, used for diagnostics.
3176 ///
3177 /// \param Entity The name of the entity that involves the block pointer
3178 /// type, if known.
3179 ///
3180 /// \returns A suitable block pointer type, if there are no
3181 /// errors. Otherwise, returns a NULL type.
BuildBlockPointerType(QualType T,SourceLocation Loc,DeclarationName Entity)3182 QualType Sema::BuildBlockPointerType(QualType T,
3183 SourceLocation Loc,
3184 DeclarationName Entity) {
3185 if (!T->isFunctionType()) {
3186 Diag(Loc, diag::err_nonfunction_block_type);
3187 return QualType();
3188 }
3189
3190 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
3191 return QualType();
3192
3193 if (getLangOpts().OpenCL)
3194 T = deduceOpenCLPointeeAddrSpace(*this, T);
3195
3196 return Context.getBlockPointerType(T);
3197 }
3198
GetTypeFromParser(ParsedType Ty,TypeSourceInfo ** TInfo)3199 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
3200 QualType QT = Ty.get();
3201 if (QT.isNull()) {
3202 if (TInfo) *TInfo = nullptr;
3203 return QualType();
3204 }
3205
3206 TypeSourceInfo *DI = nullptr;
3207 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
3208 QT = LIT->getType();
3209 DI = LIT->getTypeSourceInfo();
3210 }
3211
3212 if (TInfo) *TInfo = DI;
3213 return QT;
3214 }
3215
3216 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
3217 Qualifiers::ObjCLifetime ownership,
3218 unsigned chunkIndex);
3219
3220 /// Given that this is the declaration of a parameter under ARC,
3221 /// attempt to infer attributes and such for pointer-to-whatever
3222 /// types.
inferARCWriteback(TypeProcessingState & state,QualType & declSpecType)3223 static void inferARCWriteback(TypeProcessingState &state,
3224 QualType &declSpecType) {
3225 Sema &S = state.getSema();
3226 Declarator &declarator = state.getDeclarator();
3227
3228 // TODO: should we care about decl qualifiers?
3229
3230 // Check whether the declarator has the expected form. We walk
3231 // from the inside out in order to make the block logic work.
3232 unsigned outermostPointerIndex = 0;
3233 bool isBlockPointer = false;
3234 unsigned numPointers = 0;
3235 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
3236 unsigned chunkIndex = i;
3237 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
3238 switch (chunk.Kind) {
3239 case DeclaratorChunk::Paren:
3240 // Ignore parens.
3241 break;
3242
3243 case DeclaratorChunk::Reference:
3244 case DeclaratorChunk::Pointer:
3245 // Count the number of pointers. Treat references
3246 // interchangeably as pointers; if they're mis-ordered, normal
3247 // type building will discover that.
3248 outermostPointerIndex = chunkIndex;
3249 numPointers++;
3250 break;
3251
3252 case DeclaratorChunk::BlockPointer:
3253 // If we have a pointer to block pointer, that's an acceptable
3254 // indirect reference; anything else is not an application of
3255 // the rules.
3256 if (numPointers != 1) return;
3257 numPointers++;
3258 outermostPointerIndex = chunkIndex;
3259 isBlockPointer = true;
3260
3261 // We don't care about pointer structure in return values here.
3262 goto done;
3263
3264 case DeclaratorChunk::Array: // suppress if written (id[])?
3265 case DeclaratorChunk::Function:
3266 case DeclaratorChunk::MemberPointer:
3267 case DeclaratorChunk::Pipe:
3268 return;
3269 }
3270 }
3271 done:
3272
3273 // If we have *one* pointer, then we want to throw the qualifier on
3274 // the declaration-specifiers, which means that it needs to be a
3275 // retainable object type.
3276 if (numPointers == 1) {
3277 // If it's not a retainable object type, the rule doesn't apply.
3278 if (!declSpecType->isObjCRetainableType()) return;
3279
3280 // If it already has lifetime, don't do anything.
3281 if (declSpecType.getObjCLifetime()) return;
3282
3283 // Otherwise, modify the type in-place.
3284 Qualifiers qs;
3285
3286 if (declSpecType->isObjCARCImplicitlyUnretainedType())
3287 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
3288 else
3289 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
3290 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
3291
3292 // If we have *two* pointers, then we want to throw the qualifier on
3293 // the outermost pointer.
3294 } else if (numPointers == 2) {
3295 // If we don't have a block pointer, we need to check whether the
3296 // declaration-specifiers gave us something that will turn into a
3297 // retainable object pointer after we slap the first pointer on it.
3298 if (!isBlockPointer && !declSpecType->isObjCObjectType())
3299 return;
3300
3301 // Look for an explicit lifetime attribute there.
3302 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
3303 if (chunk.Kind != DeclaratorChunk::Pointer &&
3304 chunk.Kind != DeclaratorChunk::BlockPointer)
3305 return;
3306 for (const ParsedAttr &AL : chunk.getAttrs())
3307 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership)
3308 return;
3309
3310 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
3311 outermostPointerIndex);
3312
3313 // Any other number of pointers/references does not trigger the rule.
3314 } else return;
3315
3316 // TODO: mark whether we did this inference?
3317 }
3318
diagnoseIgnoredQualifiers(unsigned DiagID,unsigned Quals,SourceLocation FallbackLoc,SourceLocation ConstQualLoc,SourceLocation VolatileQualLoc,SourceLocation RestrictQualLoc,SourceLocation AtomicQualLoc,SourceLocation UnalignedQualLoc)3319 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
3320 SourceLocation FallbackLoc,
3321 SourceLocation ConstQualLoc,
3322 SourceLocation VolatileQualLoc,
3323 SourceLocation RestrictQualLoc,
3324 SourceLocation AtomicQualLoc,
3325 SourceLocation UnalignedQualLoc) {
3326 if (!Quals)
3327 return;
3328
3329 struct Qual {
3330 const char *Name;
3331 unsigned Mask;
3332 SourceLocation Loc;
3333 } const QualKinds[5] = {
3334 { "const", DeclSpec::TQ_const, ConstQualLoc },
3335 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
3336 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
3337 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
3338 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
3339 };
3340
3341 SmallString<32> QualStr;
3342 unsigned NumQuals = 0;
3343 SourceLocation Loc;
3344 FixItHint FixIts[5];
3345
3346 // Build a string naming the redundant qualifiers.
3347 for (auto &E : QualKinds) {
3348 if (Quals & E.Mask) {
3349 if (!QualStr.empty()) QualStr += ' ';
3350 QualStr += E.Name;
3351
3352 // If we have a location for the qualifier, offer a fixit.
3353 SourceLocation QualLoc = E.Loc;
3354 if (QualLoc.isValid()) {
3355 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
3356 if (Loc.isInvalid() ||
3357 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
3358 Loc = QualLoc;
3359 }
3360
3361 ++NumQuals;
3362 }
3363 }
3364
3365 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
3366 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
3367 }
3368
3369 // Diagnose pointless type qualifiers on the return type of a function.
diagnoseRedundantReturnTypeQualifiers(Sema & S,QualType RetTy,Declarator & D,unsigned FunctionChunkIndex)3370 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
3371 Declarator &D,
3372 unsigned FunctionChunkIndex) {
3373 const DeclaratorChunk::FunctionTypeInfo &FTI =
3374 D.getTypeObject(FunctionChunkIndex).Fun;
3375 if (FTI.hasTrailingReturnType()) {
3376 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3377 RetTy.getLocalCVRQualifiers(),
3378 FTI.getTrailingReturnTypeLoc());
3379 return;
3380 }
3381
3382 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
3383 End = D.getNumTypeObjects();
3384 OuterChunkIndex != End; ++OuterChunkIndex) {
3385 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
3386 switch (OuterChunk.Kind) {
3387 case DeclaratorChunk::Paren:
3388 continue;
3389
3390 case DeclaratorChunk::Pointer: {
3391 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
3392 S.diagnoseIgnoredQualifiers(
3393 diag::warn_qual_return_type,
3394 PTI.TypeQuals,
3395 SourceLocation(),
3396 PTI.ConstQualLoc,
3397 PTI.VolatileQualLoc,
3398 PTI.RestrictQualLoc,
3399 PTI.AtomicQualLoc,
3400 PTI.UnalignedQualLoc);
3401 return;
3402 }
3403
3404 case DeclaratorChunk::Function:
3405 case DeclaratorChunk::BlockPointer:
3406 case DeclaratorChunk::Reference:
3407 case DeclaratorChunk::Array:
3408 case DeclaratorChunk::MemberPointer:
3409 case DeclaratorChunk::Pipe:
3410 // FIXME: We can't currently provide an accurate source location and a
3411 // fix-it hint for these.
3412 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
3413 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3414 RetTy.getCVRQualifiers() | AtomicQual,
3415 D.getIdentifierLoc());
3416 return;
3417 }
3418
3419 llvm_unreachable("unknown declarator chunk kind");
3420 }
3421
3422 // If the qualifiers come from a conversion function type, don't diagnose
3423 // them -- they're not necessarily redundant, since such a conversion
3424 // operator can be explicitly called as "x.operator const int()".
3425 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3426 return;
3427
3428 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
3429 // which are present there.
3430 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3431 D.getDeclSpec().getTypeQualifiers(),
3432 D.getIdentifierLoc(),
3433 D.getDeclSpec().getConstSpecLoc(),
3434 D.getDeclSpec().getVolatileSpecLoc(),
3435 D.getDeclSpec().getRestrictSpecLoc(),
3436 D.getDeclSpec().getAtomicSpecLoc(),
3437 D.getDeclSpec().getUnalignedSpecLoc());
3438 }
3439
3440 static std::pair<QualType, TypeSourceInfo *>
InventTemplateParameter(TypeProcessingState & state,QualType T,TypeSourceInfo * TrailingTSI,AutoType * Auto,InventedTemplateParameterInfo & Info)3441 InventTemplateParameter(TypeProcessingState &state, QualType T,
3442 TypeSourceInfo *TrailingTSI, AutoType *Auto,
3443 InventedTemplateParameterInfo &Info) {
3444 Sema &S = state.getSema();
3445 Declarator &D = state.getDeclarator();
3446
3447 const unsigned TemplateParameterDepth = Info.AutoTemplateParameterDepth;
3448 const unsigned AutoParameterPosition = Info.TemplateParams.size();
3449 const bool IsParameterPack = D.hasEllipsis();
3450
3451 // If auto is mentioned in a lambda parameter or abbreviated function
3452 // template context, convert it to a template parameter type.
3453
3454 // Create the TemplateTypeParmDecl here to retrieve the corresponding
3455 // template parameter type. Template parameters are temporarily added
3456 // to the TU until the associated TemplateDecl is created.
3457 TemplateTypeParmDecl *InventedTemplateParam =
3458 TemplateTypeParmDecl::Create(
3459 S.Context, S.Context.getTranslationUnitDecl(),
3460 /*KeyLoc=*/D.getDeclSpec().getTypeSpecTypeLoc(),
3461 /*NameLoc=*/D.getIdentifierLoc(),
3462 TemplateParameterDepth, AutoParameterPosition,
3463 S.InventAbbreviatedTemplateParameterTypeName(
3464 D.getIdentifier(), AutoParameterPosition), false,
3465 IsParameterPack, /*HasTypeConstraint=*/Auto->isConstrained());
3466 InventedTemplateParam->setImplicit();
3467 Info.TemplateParams.push_back(InventedTemplateParam);
3468
3469 // Attach type constraints to the new parameter.
3470 if (Auto->isConstrained()) {
3471 if (TrailingTSI) {
3472 // The 'auto' appears in a trailing return type we've already built;
3473 // extract its type constraints to attach to the template parameter.
3474 AutoTypeLoc AutoLoc = TrailingTSI->getTypeLoc().getContainedAutoTypeLoc();
3475 TemplateArgumentListInfo TAL(AutoLoc.getLAngleLoc(), AutoLoc.getRAngleLoc());
3476 bool Invalid = false;
3477 for (unsigned Idx = 0; Idx < AutoLoc.getNumArgs(); ++Idx) {
3478 if (D.getEllipsisLoc().isInvalid() && !Invalid &&
3479 S.DiagnoseUnexpandedParameterPack(AutoLoc.getArgLoc(Idx),
3480 Sema::UPPC_TypeConstraint))
3481 Invalid = true;
3482 TAL.addArgument(AutoLoc.getArgLoc(Idx));
3483 }
3484
3485 if (!Invalid) {
3486 S.AttachTypeConstraint(
3487 AutoLoc.getNestedNameSpecifierLoc(), AutoLoc.getConceptNameInfo(),
3488 AutoLoc.getNamedConcept(),
3489 AutoLoc.hasExplicitTemplateArgs() ? &TAL : nullptr,
3490 InventedTemplateParam, D.getEllipsisLoc());
3491 }
3492 } else {
3493 // The 'auto' appears in the decl-specifiers; we've not finished forming
3494 // TypeSourceInfo for it yet.
3495 TemplateIdAnnotation *TemplateId = D.getDeclSpec().getRepAsTemplateId();
3496 TemplateArgumentListInfo TemplateArgsInfo;
3497 bool Invalid = false;
3498 if (TemplateId->LAngleLoc.isValid()) {
3499 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
3500 TemplateId->NumArgs);
3501 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
3502
3503 if (D.getEllipsisLoc().isInvalid()) {
3504 for (TemplateArgumentLoc Arg : TemplateArgsInfo.arguments()) {
3505 if (S.DiagnoseUnexpandedParameterPack(Arg,
3506 Sema::UPPC_TypeConstraint)) {
3507 Invalid = true;
3508 break;
3509 }
3510 }
3511 }
3512 }
3513 if (!Invalid) {
3514 S.AttachTypeConstraint(
3515 D.getDeclSpec().getTypeSpecScope().getWithLocInContext(S.Context),
3516 DeclarationNameInfo(DeclarationName(TemplateId->Name),
3517 TemplateId->TemplateNameLoc),
3518 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl()),
3519 TemplateId->LAngleLoc.isValid() ? &TemplateArgsInfo : nullptr,
3520 InventedTemplateParam, D.getEllipsisLoc());
3521 }
3522 }
3523 }
3524
3525 // Replace the 'auto' in the function parameter with this invented
3526 // template type parameter.
3527 // FIXME: Retain some type sugar to indicate that this was written
3528 // as 'auto'?
3529 QualType Replacement(InventedTemplateParam->getTypeForDecl(), 0);
3530 QualType NewT = state.ReplaceAutoType(T, Replacement);
3531 TypeSourceInfo *NewTSI =
3532 TrailingTSI ? S.ReplaceAutoTypeSourceInfo(TrailingTSI, Replacement)
3533 : nullptr;
3534 return {NewT, NewTSI};
3535 }
3536
3537 static TypeSourceInfo *
3538 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
3539 QualType T, TypeSourceInfo *ReturnTypeInfo);
3540
GetDeclSpecTypeForDeclarator(TypeProcessingState & state,TypeSourceInfo * & ReturnTypeInfo)3541 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
3542 TypeSourceInfo *&ReturnTypeInfo) {
3543 Sema &SemaRef = state.getSema();
3544 Declarator &D = state.getDeclarator();
3545 QualType T;
3546 ReturnTypeInfo = nullptr;
3547
3548 // The TagDecl owned by the DeclSpec.
3549 TagDecl *OwnedTagDecl = nullptr;
3550
3551 switch (D.getName().getKind()) {
3552 case UnqualifiedIdKind::IK_ImplicitSelfParam:
3553 case UnqualifiedIdKind::IK_OperatorFunctionId:
3554 case UnqualifiedIdKind::IK_Identifier:
3555 case UnqualifiedIdKind::IK_LiteralOperatorId:
3556 case UnqualifiedIdKind::IK_TemplateId:
3557 T = ConvertDeclSpecToType(state);
3558
3559 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
3560 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
3561 // Owned declaration is embedded in declarator.
3562 OwnedTagDecl->setEmbeddedInDeclarator(true);
3563 }
3564 break;
3565
3566 case UnqualifiedIdKind::IK_ConstructorName:
3567 case UnqualifiedIdKind::IK_ConstructorTemplateId:
3568 case UnqualifiedIdKind::IK_DestructorName:
3569 // Constructors and destructors don't have return types. Use
3570 // "void" instead.
3571 T = SemaRef.Context.VoidTy;
3572 processTypeAttrs(state, T, TAL_DeclSpec,
3573 D.getMutableDeclSpec().getAttributes());
3574 break;
3575
3576 case UnqualifiedIdKind::IK_DeductionGuideName:
3577 // Deduction guides have a trailing return type and no type in their
3578 // decl-specifier sequence. Use a placeholder return type for now.
3579 T = SemaRef.Context.DependentTy;
3580 break;
3581
3582 case UnqualifiedIdKind::IK_ConversionFunctionId:
3583 // The result type of a conversion function is the type that it
3584 // converts to.
3585 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
3586 &ReturnTypeInfo);
3587 break;
3588 }
3589
3590 // Note: We don't need to distribute declaration attributes (i.e.
3591 // D.getDeclarationAttributes()) because those are always C++11 attributes,
3592 // and those don't get distributed.
3593 distributeTypeAttrsFromDeclarator(
3594 state, T, SemaRef.IdentifyCUDATarget(D.getAttributes()));
3595
3596 // Find the deduced type in this type. Look in the trailing return type if we
3597 // have one, otherwise in the DeclSpec type.
3598 // FIXME: The standard wording doesn't currently describe this.
3599 DeducedType *Deduced = T->getContainedDeducedType();
3600 bool DeducedIsTrailingReturnType = false;
3601 if (Deduced && isa<AutoType>(Deduced) && D.hasTrailingReturnType()) {
3602 QualType T = SemaRef.GetTypeFromParser(D.getTrailingReturnType());
3603 Deduced = T.isNull() ? nullptr : T->getContainedDeducedType();
3604 DeducedIsTrailingReturnType = true;
3605 }
3606
3607 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
3608 if (Deduced) {
3609 AutoType *Auto = dyn_cast<AutoType>(Deduced);
3610 int Error = -1;
3611
3612 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
3613 // class template argument deduction)?
3614 bool IsCXXAutoType =
3615 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
3616 bool IsDeducedReturnType = false;
3617
3618 switch (D.getContext()) {
3619 case DeclaratorContext::LambdaExpr:
3620 // Declared return type of a lambda-declarator is implicit and is always
3621 // 'auto'.
3622 break;
3623 case DeclaratorContext::ObjCParameter:
3624 case DeclaratorContext::ObjCResult:
3625 Error = 0;
3626 break;
3627 case DeclaratorContext::RequiresExpr:
3628 Error = 22;
3629 break;
3630 case DeclaratorContext::Prototype:
3631 case DeclaratorContext::LambdaExprParameter: {
3632 InventedTemplateParameterInfo *Info = nullptr;
3633 if (D.getContext() == DeclaratorContext::Prototype) {
3634 // With concepts we allow 'auto' in function parameters.
3635 if (!SemaRef.getLangOpts().CPlusPlus20 || !Auto ||
3636 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3637 Error = 0;
3638 break;
3639 } else if (!SemaRef.getCurScope()->isFunctionDeclarationScope()) {
3640 Error = 21;
3641 break;
3642 }
3643
3644 Info = &SemaRef.InventedParameterInfos.back();
3645 } else {
3646 // In C++14, generic lambdas allow 'auto' in their parameters.
3647 if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto ||
3648 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3649 Error = 16;
3650 break;
3651 }
3652 Info = SemaRef.getCurLambda();
3653 assert(Info && "No LambdaScopeInfo on the stack!");
3654 }
3655
3656 // We'll deal with inventing template parameters for 'auto' in trailing
3657 // return types when we pick up the trailing return type when processing
3658 // the function chunk.
3659 if (!DeducedIsTrailingReturnType)
3660 T = InventTemplateParameter(state, T, nullptr, Auto, *Info).first;
3661 break;
3662 }
3663 case DeclaratorContext::Member: {
3664 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
3665 D.isFunctionDeclarator())
3666 break;
3667 bool Cxx = SemaRef.getLangOpts().CPlusPlus;
3668 if (isa<ObjCContainerDecl>(SemaRef.CurContext)) {
3669 Error = 6; // Interface member.
3670 } else {
3671 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
3672 case TagTypeKind::Enum:
3673 llvm_unreachable("unhandled tag kind");
3674 case TagTypeKind::Struct:
3675 Error = Cxx ? 1 : 2; /* Struct member */
3676 break;
3677 case TagTypeKind::Union:
3678 Error = Cxx ? 3 : 4; /* Union member */
3679 break;
3680 case TagTypeKind::Class:
3681 Error = 5; /* Class member */
3682 break;
3683 case TagTypeKind::Interface:
3684 Error = 6; /* Interface member */
3685 break;
3686 }
3687 }
3688 if (D.getDeclSpec().isFriendSpecified())
3689 Error = 20; // Friend type
3690 break;
3691 }
3692 case DeclaratorContext::CXXCatch:
3693 case DeclaratorContext::ObjCCatch:
3694 Error = 7; // Exception declaration
3695 break;
3696 case DeclaratorContext::TemplateParam:
3697 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3698 !SemaRef.getLangOpts().CPlusPlus20)
3699 Error = 19; // Template parameter (until C++20)
3700 else if (!SemaRef.getLangOpts().CPlusPlus17)
3701 Error = 8; // Template parameter (until C++17)
3702 break;
3703 case DeclaratorContext::BlockLiteral:
3704 Error = 9; // Block literal
3705 break;
3706 case DeclaratorContext::TemplateArg:
3707 // Within a template argument list, a deduced template specialization
3708 // type will be reinterpreted as a template template argument.
3709 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3710 !D.getNumTypeObjects() &&
3711 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier)
3712 break;
3713 [[fallthrough]];
3714 case DeclaratorContext::TemplateTypeArg:
3715 Error = 10; // Template type argument
3716 break;
3717 case DeclaratorContext::AliasDecl:
3718 case DeclaratorContext::AliasTemplate:
3719 Error = 12; // Type alias
3720 break;
3721 case DeclaratorContext::TrailingReturn:
3722 case DeclaratorContext::TrailingReturnVar:
3723 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3724 Error = 13; // Function return type
3725 IsDeducedReturnType = true;
3726 break;
3727 case DeclaratorContext::ConversionId:
3728 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3729 Error = 14; // conversion-type-id
3730 IsDeducedReturnType = true;
3731 break;
3732 case DeclaratorContext::FunctionalCast:
3733 if (isa<DeducedTemplateSpecializationType>(Deduced))
3734 break;
3735 if (SemaRef.getLangOpts().CPlusPlus23 && IsCXXAutoType &&
3736 !Auto->isDecltypeAuto())
3737 break; // auto(x)
3738 [[fallthrough]];
3739 case DeclaratorContext::TypeName:
3740 case DeclaratorContext::Association:
3741 Error = 15; // Generic
3742 break;
3743 case DeclaratorContext::File:
3744 case DeclaratorContext::Block:
3745 case DeclaratorContext::ForInit:
3746 case DeclaratorContext::SelectionInit:
3747 case DeclaratorContext::Condition:
3748 // FIXME: P0091R3 (erroneously) does not permit class template argument
3749 // deduction in conditions, for-init-statements, and other declarations
3750 // that are not simple-declarations.
3751 break;
3752 case DeclaratorContext::CXXNew:
3753 // FIXME: P0091R3 does not permit class template argument deduction here,
3754 // but we follow GCC and allow it anyway.
3755 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
3756 Error = 17; // 'new' type
3757 break;
3758 case DeclaratorContext::KNRTypeList:
3759 Error = 18; // K&R function parameter
3760 break;
3761 }
3762
3763 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3764 Error = 11;
3765
3766 // In Objective-C it is an error to use 'auto' on a function declarator
3767 // (and everywhere for '__auto_type').
3768 if (D.isFunctionDeclarator() &&
3769 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
3770 Error = 13;
3771
3772 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
3773 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3774 AutoRange = D.getName().getSourceRange();
3775
3776 if (Error != -1) {
3777 unsigned Kind;
3778 if (Auto) {
3779 switch (Auto->getKeyword()) {
3780 case AutoTypeKeyword::Auto: Kind = 0; break;
3781 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
3782 case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
3783 }
3784 } else {
3785 assert(isa<DeducedTemplateSpecializationType>(Deduced) &&
3786 "unknown auto type");
3787 Kind = 3;
3788 }
3789
3790 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
3791 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();
3792
3793 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
3794 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
3795 << QualType(Deduced, 0) << AutoRange;
3796 if (auto *TD = TN.getAsTemplateDecl())
3797 SemaRef.NoteTemplateLocation(*TD);
3798
3799 T = SemaRef.Context.IntTy;
3800 D.setInvalidType(true);
3801 } else if (Auto && D.getContext() != DeclaratorContext::LambdaExpr) {
3802 // If there was a trailing return type, we already got
3803 // warn_cxx98_compat_trailing_return_type in the parser.
3804 SemaRef.Diag(AutoRange.getBegin(),
3805 D.getContext() == DeclaratorContext::LambdaExprParameter
3806 ? diag::warn_cxx11_compat_generic_lambda
3807 : IsDeducedReturnType
3808 ? diag::warn_cxx11_compat_deduced_return_type
3809 : diag::warn_cxx98_compat_auto_type_specifier)
3810 << AutoRange;
3811 }
3812 }
3813
3814 if (SemaRef.getLangOpts().CPlusPlus &&
3815 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
3816 // Check the contexts where C++ forbids the declaration of a new class
3817 // or enumeration in a type-specifier-seq.
3818 unsigned DiagID = 0;
3819 switch (D.getContext()) {
3820 case DeclaratorContext::TrailingReturn:
3821 case DeclaratorContext::TrailingReturnVar:
3822 // Class and enumeration definitions are syntactically not allowed in
3823 // trailing return types.
3824 llvm_unreachable("parser should not have allowed this");
3825 break;
3826 case DeclaratorContext::File:
3827 case DeclaratorContext::Member:
3828 case DeclaratorContext::Block:
3829 case DeclaratorContext::ForInit:
3830 case DeclaratorContext::SelectionInit:
3831 case DeclaratorContext::BlockLiteral:
3832 case DeclaratorContext::LambdaExpr:
3833 // C++11 [dcl.type]p3:
3834 // A type-specifier-seq shall not define a class or enumeration unless
3835 // it appears in the type-id of an alias-declaration (7.1.3) that is not
3836 // the declaration of a template-declaration.
3837 case DeclaratorContext::AliasDecl:
3838 break;
3839 case DeclaratorContext::AliasTemplate:
3840 DiagID = diag::err_type_defined_in_alias_template;
3841 break;
3842 case DeclaratorContext::TypeName:
3843 case DeclaratorContext::FunctionalCast:
3844 case DeclaratorContext::ConversionId:
3845 case DeclaratorContext::TemplateParam:
3846 case DeclaratorContext::CXXNew:
3847 case DeclaratorContext::CXXCatch:
3848 case DeclaratorContext::ObjCCatch:
3849 case DeclaratorContext::TemplateArg:
3850 case DeclaratorContext::TemplateTypeArg:
3851 case DeclaratorContext::Association:
3852 DiagID = diag::err_type_defined_in_type_specifier;
3853 break;
3854 case DeclaratorContext::Prototype:
3855 case DeclaratorContext::LambdaExprParameter:
3856 case DeclaratorContext::ObjCParameter:
3857 case DeclaratorContext::ObjCResult:
3858 case DeclaratorContext::KNRTypeList:
3859 case DeclaratorContext::RequiresExpr:
3860 // C++ [dcl.fct]p6:
3861 // Types shall not be defined in return or parameter types.
3862 DiagID = diag::err_type_defined_in_param_type;
3863 break;
3864 case DeclaratorContext::Condition:
3865 // C++ 6.4p2:
3866 // The type-specifier-seq shall not contain typedef and shall not declare
3867 // a new class or enumeration.
3868 DiagID = diag::err_type_defined_in_condition;
3869 break;
3870 }
3871
3872 if (DiagID != 0) {
3873 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
3874 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
3875 D.setInvalidType(true);
3876 }
3877 }
3878
3879 assert(!T.isNull() && "This function should not return a null type");
3880 return T;
3881 }
3882
3883 /// Produce an appropriate diagnostic for an ambiguity between a function
3884 /// declarator and a C++ direct-initializer.
warnAboutAmbiguousFunction(Sema & S,Declarator & D,DeclaratorChunk & DeclType,QualType RT)3885 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
3886 DeclaratorChunk &DeclType, QualType RT) {
3887 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
3888 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity");
3889
3890 // If the return type is void there is no ambiguity.
3891 if (RT->isVoidType())
3892 return;
3893
3894 // An initializer for a non-class type can have at most one argument.
3895 if (!RT->isRecordType() && FTI.NumParams > 1)
3896 return;
3897
3898 // An initializer for a reference must have exactly one argument.
3899 if (RT->isReferenceType() && FTI.NumParams != 1)
3900 return;
3901
3902 // Only warn if this declarator is declaring a function at block scope, and
3903 // doesn't have a storage class (such as 'extern') specified.
3904 if (!D.isFunctionDeclarator() ||
3905 D.getFunctionDefinitionKind() != FunctionDefinitionKind::Declaration ||
3906 !S.CurContext->isFunctionOrMethod() ||
3907 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_unspecified)
3908 return;
3909
3910 // Inside a condition, a direct initializer is not permitted. We allow one to
3911 // be parsed in order to give better diagnostics in condition parsing.
3912 if (D.getContext() == DeclaratorContext::Condition)
3913 return;
3914
3915 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
3916
3917 S.Diag(DeclType.Loc,
3918 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
3919 : diag::warn_empty_parens_are_function_decl)
3920 << ParenRange;
3921
3922 // If the declaration looks like:
3923 // T var1,
3924 // f();
3925 // and name lookup finds a function named 'f', then the ',' was
3926 // probably intended to be a ';'.
3927 if (!D.isFirstDeclarator() && D.getIdentifier()) {
3928 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
3929 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
3930 if (Comma.getFileID() != Name.getFileID() ||
3931 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
3932 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3933 Sema::LookupOrdinaryName);
3934 if (S.LookupName(Result, S.getCurScope()))
3935 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
3936 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
3937 << D.getIdentifier();
3938 Result.suppressDiagnostics();
3939 }
3940 }
3941
3942 if (FTI.NumParams > 0) {
3943 // For a declaration with parameters, eg. "T var(T());", suggest adding
3944 // parens around the first parameter to turn the declaration into a
3945 // variable declaration.
3946 SourceRange Range = FTI.Params[0].Param->getSourceRange();
3947 SourceLocation B = Range.getBegin();
3948 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
3949 // FIXME: Maybe we should suggest adding braces instead of parens
3950 // in C++11 for classes that don't have an initializer_list constructor.
3951 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
3952 << FixItHint::CreateInsertion(B, "(")
3953 << FixItHint::CreateInsertion(E, ")");
3954 } else {
3955 // For a declaration without parameters, eg. "T var();", suggest replacing
3956 // the parens with an initializer to turn the declaration into a variable
3957 // declaration.
3958 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
3959
3960 // Empty parens mean value-initialization, and no parens mean
3961 // default initialization. These are equivalent if the default
3962 // constructor is user-provided or if zero-initialization is a
3963 // no-op.
3964 if (RD && RD->hasDefinition() &&
3965 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
3966 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
3967 << FixItHint::CreateRemoval(ParenRange);
3968 else {
3969 std::string Init =
3970 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
3971 if (Init.empty() && S.LangOpts.CPlusPlus11)
3972 Init = "{}";
3973 if (!Init.empty())
3974 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
3975 << FixItHint::CreateReplacement(ParenRange, Init);
3976 }
3977 }
3978 }
3979
3980 /// Produce an appropriate diagnostic for a declarator with top-level
3981 /// parentheses.
warnAboutRedundantParens(Sema & S,Declarator & D,QualType T)3982 static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) {
3983 DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1);
3984 assert(Paren.Kind == DeclaratorChunk::Paren &&
3985 "do not have redundant top-level parentheses");
3986
3987 // This is a syntactic check; we're not interested in cases that arise
3988 // during template instantiation.
3989 if (S.inTemplateInstantiation())
3990 return;
3991
3992 // Check whether this could be intended to be a construction of a temporary
3993 // object in C++ via a function-style cast.
3994 bool CouldBeTemporaryObject =
3995 S.getLangOpts().CPlusPlus && D.isExpressionContext() &&
3996 !D.isInvalidType() && D.getIdentifier() &&
3997 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier &&
3998 (T->isRecordType() || T->isDependentType()) &&
3999 D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator();
4000
4001 bool StartsWithDeclaratorId = true;
4002 for (auto &C : D.type_objects()) {
4003 switch (C.Kind) {
4004 case DeclaratorChunk::Paren:
4005 if (&C == &Paren)
4006 continue;
4007 [[fallthrough]];
4008 case DeclaratorChunk::Pointer:
4009 StartsWithDeclaratorId = false;
4010 continue;
4011
4012 case DeclaratorChunk::Array:
4013 if (!C.Arr.NumElts)
4014 CouldBeTemporaryObject = false;
4015 continue;
4016
4017 case DeclaratorChunk::Reference:
4018 // FIXME: Suppress the warning here if there is no initializer; we're
4019 // going to give an error anyway.
4020 // We assume that something like 'T (&x) = y;' is highly likely to not
4021 // be intended to be a temporary object.
4022 CouldBeTemporaryObject = false;
4023 StartsWithDeclaratorId = false;
4024 continue;
4025
4026 case DeclaratorChunk::Function:
4027 // In a new-type-id, function chunks require parentheses.
4028 if (D.getContext() == DeclaratorContext::CXXNew)
4029 return;
4030 // FIXME: "A(f())" deserves a vexing-parse warning, not just a
4031 // redundant-parens warning, but we don't know whether the function
4032 // chunk was syntactically valid as an expression here.
4033 CouldBeTemporaryObject = false;
4034 continue;
4035
4036 case DeclaratorChunk::BlockPointer:
4037 case DeclaratorChunk::MemberPointer:
4038 case DeclaratorChunk::Pipe:
4039 // These cannot appear in expressions.
4040 CouldBeTemporaryObject = false;
4041 StartsWithDeclaratorId = false;
4042 continue;
4043 }
4044 }
4045
4046 // FIXME: If there is an initializer, assume that this is not intended to be
4047 // a construction of a temporary object.
4048
4049 // Check whether the name has already been declared; if not, this is not a
4050 // function-style cast.
4051 if (CouldBeTemporaryObject) {
4052 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
4053 Sema::LookupOrdinaryName);
4054 if (!S.LookupName(Result, S.getCurScope()))
4055 CouldBeTemporaryObject = false;
4056 Result.suppressDiagnostics();
4057 }
4058
4059 SourceRange ParenRange(Paren.Loc, Paren.EndLoc);
4060
4061 if (!CouldBeTemporaryObject) {
4062 // If we have A (::B), the parentheses affect the meaning of the program.
4063 // Suppress the warning in that case. Don't bother looking at the DeclSpec
4064 // here: even (e.g.) "int ::x" is visually ambiguous even though it's
4065 // formally unambiguous.
4066 if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) {
4067 for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS;
4068 NNS = NNS->getPrefix()) {
4069 if (NNS->getKind() == NestedNameSpecifier::Global)
4070 return;
4071 }
4072 }
4073
4074 S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator)
4075 << ParenRange << FixItHint::CreateRemoval(Paren.Loc)
4076 << FixItHint::CreateRemoval(Paren.EndLoc);
4077 return;
4078 }
4079
4080 S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration)
4081 << ParenRange << D.getIdentifier();
4082 auto *RD = T->getAsCXXRecordDecl();
4083 if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor())
4084 S.Diag(Paren.Loc, diag::note_raii_guard_add_name)
4085 << FixItHint::CreateInsertion(Paren.Loc, " varname") << T
4086 << D.getIdentifier();
4087 // FIXME: A cast to void is probably a better suggestion in cases where it's
4088 // valid (when there is no initializer and we're not in a condition).
4089 S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses)
4090 << FixItHint::CreateInsertion(D.getBeginLoc(), "(")
4091 << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")");
4092 S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration)
4093 << FixItHint::CreateRemoval(Paren.Loc)
4094 << FixItHint::CreateRemoval(Paren.EndLoc);
4095 }
4096
4097 /// Helper for figuring out the default CC for a function declarator type. If
4098 /// this is the outermost chunk, then we can determine the CC from the
4099 /// declarator context. If not, then this could be either a member function
4100 /// type or normal function type.
getCCForDeclaratorChunk(Sema & S,Declarator & D,const ParsedAttributesView & AttrList,const DeclaratorChunk::FunctionTypeInfo & FTI,unsigned ChunkIndex)4101 static CallingConv getCCForDeclaratorChunk(
4102 Sema &S, Declarator &D, const ParsedAttributesView &AttrList,
4103 const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) {
4104 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function);
4105
4106 // Check for an explicit CC attribute.
4107 for (const ParsedAttr &AL : AttrList) {
4108 switch (AL.getKind()) {
4109 CALLING_CONV_ATTRS_CASELIST : {
4110 // Ignore attributes that don't validate or can't apply to the
4111 // function type. We'll diagnose the failure to apply them in
4112 // handleFunctionTypeAttr.
4113 CallingConv CC;
4114 if (!S.CheckCallingConvAttr(AL, CC, /*FunctionDecl=*/nullptr,
4115 S.IdentifyCUDATarget(D.getAttributes())) &&
4116 (!FTI.isVariadic || supportsVariadicCall(CC))) {
4117 return CC;
4118 }
4119 break;
4120 }
4121
4122 default:
4123 break;
4124 }
4125 }
4126
4127 bool IsCXXInstanceMethod = false;
4128
4129 if (S.getLangOpts().CPlusPlus) {
4130 // Look inwards through parentheses to see if this chunk will form a
4131 // member pointer type or if we're the declarator. Any type attributes
4132 // between here and there will override the CC we choose here.
4133 unsigned I = ChunkIndex;
4134 bool FoundNonParen = false;
4135 while (I && !FoundNonParen) {
4136 --I;
4137 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
4138 FoundNonParen = true;
4139 }
4140
4141 if (FoundNonParen) {
4142 // If we're not the declarator, we're a regular function type unless we're
4143 // in a member pointer.
4144 IsCXXInstanceMethod =
4145 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
4146 } else if (D.getContext() == DeclaratorContext::LambdaExpr) {
4147 // This can only be a call operator for a lambda, which is an instance
4148 // method, unless explicitly specified as 'static'.
4149 IsCXXInstanceMethod =
4150 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static;
4151 } else {
4152 // We're the innermost decl chunk, so must be a function declarator.
4153 assert(D.isFunctionDeclarator());
4154
4155 // If we're inside a record, we're declaring a method, but it could be
4156 // explicitly or implicitly static.
4157 IsCXXInstanceMethod =
4158 D.isFirstDeclarationOfMember() &&
4159 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
4160 !D.isStaticMember();
4161 }
4162 }
4163
4164 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
4165 IsCXXInstanceMethod);
4166
4167 // Attribute AT_OpenCLKernel affects the calling convention for SPIR
4168 // and AMDGPU targets, hence it cannot be treated as a calling
4169 // convention attribute. This is the simplest place to infer
4170 // calling convention for OpenCL kernels.
4171 if (S.getLangOpts().OpenCL) {
4172 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
4173 if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) {
4174 CC = CC_OpenCLKernel;
4175 break;
4176 }
4177 }
4178 } else if (S.getLangOpts().CUDA) {
4179 // If we're compiling CUDA/HIP code and targeting SPIR-V we need to make
4180 // sure the kernels will be marked with the right calling convention so that
4181 // they will be visible by the APIs that ingest SPIR-V.
4182 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
4183 if (Triple.getArch() == llvm::Triple::spirv32 ||
4184 Triple.getArch() == llvm::Triple::spirv64) {
4185 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
4186 if (AL.getKind() == ParsedAttr::AT_CUDAGlobal) {
4187 CC = CC_OpenCLKernel;
4188 break;
4189 }
4190 }
4191 }
4192 }
4193
4194 return CC;
4195 }
4196
4197 namespace {
4198 /// A simple notion of pointer kinds, which matches up with the various
4199 /// pointer declarators.
4200 enum class SimplePointerKind {
4201 Pointer,
4202 BlockPointer,
4203 MemberPointer,
4204 Array,
4205 };
4206 } // end anonymous namespace
4207
getNullabilityKeyword(NullabilityKind nullability)4208 IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
4209 switch (nullability) {
4210 case NullabilityKind::NonNull:
4211 if (!Ident__Nonnull)
4212 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
4213 return Ident__Nonnull;
4214
4215 case NullabilityKind::Nullable:
4216 if (!Ident__Nullable)
4217 Ident__Nullable = PP.getIdentifierInfo("_Nullable");
4218 return Ident__Nullable;
4219
4220 case NullabilityKind::NullableResult:
4221 if (!Ident__Nullable_result)
4222 Ident__Nullable_result = PP.getIdentifierInfo("_Nullable_result");
4223 return Ident__Nullable_result;
4224
4225 case NullabilityKind::Unspecified:
4226 if (!Ident__Null_unspecified)
4227 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
4228 return Ident__Null_unspecified;
4229 }
4230 llvm_unreachable("Unknown nullability kind.");
4231 }
4232
4233 /// Retrieve the identifier "NSError".
getNSErrorIdent()4234 IdentifierInfo *Sema::getNSErrorIdent() {
4235 if (!Ident_NSError)
4236 Ident_NSError = PP.getIdentifierInfo("NSError");
4237
4238 return Ident_NSError;
4239 }
4240
4241 /// Check whether there is a nullability attribute of any kind in the given
4242 /// attribute list.
hasNullabilityAttr(const ParsedAttributesView & attrs)4243 static bool hasNullabilityAttr(const ParsedAttributesView &attrs) {
4244 for (const ParsedAttr &AL : attrs) {
4245 if (AL.getKind() == ParsedAttr::AT_TypeNonNull ||
4246 AL.getKind() == ParsedAttr::AT_TypeNullable ||
4247 AL.getKind() == ParsedAttr::AT_TypeNullableResult ||
4248 AL.getKind() == ParsedAttr::AT_TypeNullUnspecified)
4249 return true;
4250 }
4251
4252 return false;
4253 }
4254
4255 namespace {
4256 /// Describes the kind of a pointer a declarator describes.
4257 enum class PointerDeclaratorKind {
4258 // Not a pointer.
4259 NonPointer,
4260 // Single-level pointer.
4261 SingleLevelPointer,
4262 // Multi-level pointer (of any pointer kind).
4263 MultiLevelPointer,
4264 // CFFooRef*
4265 MaybePointerToCFRef,
4266 // CFErrorRef*
4267 CFErrorRefPointer,
4268 // NSError**
4269 NSErrorPointerPointer,
4270 };
4271
4272 /// Describes a declarator chunk wrapping a pointer that marks inference as
4273 /// unexpected.
4274 // These values must be kept in sync with diagnostics.
4275 enum class PointerWrappingDeclaratorKind {
4276 /// Pointer is top-level.
4277 None = -1,
4278 /// Pointer is an array element.
4279 Array = 0,
4280 /// Pointer is the referent type of a C++ reference.
4281 Reference = 1
4282 };
4283 } // end anonymous namespace
4284
4285 /// Classify the given declarator, whose type-specified is \c type, based on
4286 /// what kind of pointer it refers to.
4287 ///
4288 /// This is used to determine the default nullability.
4289 static PointerDeclaratorKind
classifyPointerDeclarator(Sema & S,QualType type,Declarator & declarator,PointerWrappingDeclaratorKind & wrappingKind)4290 classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
4291 PointerWrappingDeclaratorKind &wrappingKind) {
4292 unsigned numNormalPointers = 0;
4293
4294 // For any dependent type, we consider it a non-pointer.
4295 if (type->isDependentType())
4296 return PointerDeclaratorKind::NonPointer;
4297
4298 // Look through the declarator chunks to identify pointers.
4299 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
4300 DeclaratorChunk &chunk = declarator.getTypeObject(i);
4301 switch (chunk.Kind) {
4302 case DeclaratorChunk::Array:
4303 if (numNormalPointers == 0)
4304 wrappingKind = PointerWrappingDeclaratorKind::Array;
4305 break;
4306
4307 case DeclaratorChunk::Function:
4308 case DeclaratorChunk::Pipe:
4309 break;
4310
4311 case DeclaratorChunk::BlockPointer:
4312 case DeclaratorChunk::MemberPointer:
4313 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4314 : PointerDeclaratorKind::SingleLevelPointer;
4315
4316 case DeclaratorChunk::Paren:
4317 break;
4318
4319 case DeclaratorChunk::Reference:
4320 if (numNormalPointers == 0)
4321 wrappingKind = PointerWrappingDeclaratorKind::Reference;
4322 break;
4323
4324 case DeclaratorChunk::Pointer:
4325 ++numNormalPointers;
4326 if (numNormalPointers > 2)
4327 return PointerDeclaratorKind::MultiLevelPointer;
4328 break;
4329 }
4330 }
4331
4332 // Then, dig into the type specifier itself.
4333 unsigned numTypeSpecifierPointers = 0;
4334 do {
4335 // Decompose normal pointers.
4336 if (auto ptrType = type->getAs<PointerType>()) {
4337 ++numNormalPointers;
4338
4339 if (numNormalPointers > 2)
4340 return PointerDeclaratorKind::MultiLevelPointer;
4341
4342 type = ptrType->getPointeeType();
4343 ++numTypeSpecifierPointers;
4344 continue;
4345 }
4346
4347 // Decompose block pointers.
4348 if (type->getAs<BlockPointerType>()) {
4349 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4350 : PointerDeclaratorKind::SingleLevelPointer;
4351 }
4352
4353 // Decompose member pointers.
4354 if (type->getAs<MemberPointerType>()) {
4355 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4356 : PointerDeclaratorKind::SingleLevelPointer;
4357 }
4358
4359 // Look at Objective-C object pointers.
4360 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
4361 ++numNormalPointers;
4362 ++numTypeSpecifierPointers;
4363
4364 // If this is NSError**, report that.
4365 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
4366 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
4367 numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
4368 return PointerDeclaratorKind::NSErrorPointerPointer;
4369 }
4370 }
4371
4372 break;
4373 }
4374
4375 // Look at Objective-C class types.
4376 if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
4377 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
4378 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
4379 return PointerDeclaratorKind::NSErrorPointerPointer;
4380 }
4381
4382 break;
4383 }
4384
4385 // If at this point we haven't seen a pointer, we won't see one.
4386 if (numNormalPointers == 0)
4387 return PointerDeclaratorKind::NonPointer;
4388
4389 if (auto recordType = type->getAs<RecordType>()) {
4390 RecordDecl *recordDecl = recordType->getDecl();
4391
4392 // If this is CFErrorRef*, report it as such.
4393 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2 &&
4394 S.isCFError(recordDecl)) {
4395 return PointerDeclaratorKind::CFErrorRefPointer;
4396 }
4397 break;
4398 }
4399
4400 break;
4401 } while (true);
4402
4403 switch (numNormalPointers) {
4404 case 0:
4405 return PointerDeclaratorKind::NonPointer;
4406
4407 case 1:
4408 return PointerDeclaratorKind::SingleLevelPointer;
4409
4410 case 2:
4411 return PointerDeclaratorKind::MaybePointerToCFRef;
4412
4413 default:
4414 return PointerDeclaratorKind::MultiLevelPointer;
4415 }
4416 }
4417
isCFError(RecordDecl * RD)4418 bool Sema::isCFError(RecordDecl *RD) {
4419 // If we already know about CFError, test it directly.
4420 if (CFError)
4421 return CFError == RD;
4422
4423 // Check whether this is CFError, which we identify based on its bridge to
4424 // NSError. CFErrorRef used to be declared with "objc_bridge" but is now
4425 // declared with "objc_bridge_mutable", so look for either one of the two
4426 // attributes.
4427 if (RD->getTagKind() == TagTypeKind::Struct) {
4428 IdentifierInfo *bridgedType = nullptr;
4429 if (auto bridgeAttr = RD->getAttr<ObjCBridgeAttr>())
4430 bridgedType = bridgeAttr->getBridgedType();
4431 else if (auto bridgeAttr = RD->getAttr<ObjCBridgeMutableAttr>())
4432 bridgedType = bridgeAttr->getBridgedType();
4433
4434 if (bridgedType == getNSErrorIdent()) {
4435 CFError = RD;
4436 return true;
4437 }
4438 }
4439
4440 return false;
4441 }
4442
getNullabilityCompletenessCheckFileID(Sema & S,SourceLocation loc)4443 static FileID getNullabilityCompletenessCheckFileID(Sema &S,
4444 SourceLocation loc) {
4445 // If we're anywhere in a function, method, or closure context, don't perform
4446 // completeness checks.
4447 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
4448 if (ctx->isFunctionOrMethod())
4449 return FileID();
4450
4451 if (ctx->isFileContext())
4452 break;
4453 }
4454
4455 // We only care about the expansion location.
4456 loc = S.SourceMgr.getExpansionLoc(loc);
4457 FileID file = S.SourceMgr.getFileID(loc);
4458 if (file.isInvalid())
4459 return FileID();
4460
4461 // Retrieve file information.
4462 bool invalid = false;
4463 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
4464 if (invalid || !sloc.isFile())
4465 return FileID();
4466
4467 // We don't want to perform completeness checks on the main file or in
4468 // system headers.
4469 const SrcMgr::FileInfo &fileInfo = sloc.getFile();
4470 if (fileInfo.getIncludeLoc().isInvalid())
4471 return FileID();
4472 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
4473 S.Diags.getSuppressSystemWarnings()) {
4474 return FileID();
4475 }
4476
4477 return file;
4478 }
4479
4480 /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
4481 /// taking into account whitespace before and after.
4482 template <typename DiagBuilderT>
fixItNullability(Sema & S,DiagBuilderT & Diag,SourceLocation PointerLoc,NullabilityKind Nullability)4483 static void fixItNullability(Sema &S, DiagBuilderT &Diag,
4484 SourceLocation PointerLoc,
4485 NullabilityKind Nullability) {
4486 assert(PointerLoc.isValid());
4487 if (PointerLoc.isMacroID())
4488 return;
4489
4490 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
4491 if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
4492 return;
4493
4494 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
4495 if (!NextChar)
4496 return;
4497
4498 SmallString<32> InsertionTextBuf{" "};
4499 InsertionTextBuf += getNullabilitySpelling(Nullability);
4500 InsertionTextBuf += " ";
4501 StringRef InsertionText = InsertionTextBuf.str();
4502
4503 if (isWhitespace(*NextChar)) {
4504 InsertionText = InsertionText.drop_back();
4505 } else if (NextChar[-1] == '[') {
4506 if (NextChar[0] == ']')
4507 InsertionText = InsertionText.drop_back().drop_front();
4508 else
4509 InsertionText = InsertionText.drop_front();
4510 } else if (!isAsciiIdentifierContinue(NextChar[0], /*allow dollar*/ true) &&
4511 !isAsciiIdentifierContinue(NextChar[-1], /*allow dollar*/ true)) {
4512 InsertionText = InsertionText.drop_back().drop_front();
4513 }
4514
4515 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
4516 }
4517
emitNullabilityConsistencyWarning(Sema & S,SimplePointerKind PointerKind,SourceLocation PointerLoc,SourceLocation PointerEndLoc)4518 static void emitNullabilityConsistencyWarning(Sema &S,
4519 SimplePointerKind PointerKind,
4520 SourceLocation PointerLoc,
4521 SourceLocation PointerEndLoc) {
4522 assert(PointerLoc.isValid());
4523
4524 if (PointerKind == SimplePointerKind::Array) {
4525 S.Diag(PointerLoc, diag::warn_nullability_missing_array);
4526 } else {
4527 S.Diag(PointerLoc, diag::warn_nullability_missing)
4528 << static_cast<unsigned>(PointerKind);
4529 }
4530
4531 auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc;
4532 if (FixItLoc.isMacroID())
4533 return;
4534
4535 auto addFixIt = [&](NullabilityKind Nullability) {
4536 auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it);
4537 Diag << static_cast<unsigned>(Nullability);
4538 Diag << static_cast<unsigned>(PointerKind);
4539 fixItNullability(S, Diag, FixItLoc, Nullability);
4540 };
4541 addFixIt(NullabilityKind::Nullable);
4542 addFixIt(NullabilityKind::NonNull);
4543 }
4544
4545 /// Complains about missing nullability if the file containing \p pointerLoc
4546 /// has other uses of nullability (either the keywords or the \c assume_nonnull
4547 /// pragma).
4548 ///
4549 /// If the file has \e not seen other uses of nullability, this particular
4550 /// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
4551 static void
checkNullabilityConsistency(Sema & S,SimplePointerKind pointerKind,SourceLocation pointerLoc,SourceLocation pointerEndLoc=SourceLocation ())4552 checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind,
4553 SourceLocation pointerLoc,
4554 SourceLocation pointerEndLoc = SourceLocation()) {
4555 // Determine which file we're performing consistency checking for.
4556 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
4557 if (file.isInvalid())
4558 return;
4559
4560 // If we haven't seen any type nullability in this file, we won't warn now
4561 // about anything.
4562 FileNullability &fileNullability = S.NullabilityMap[file];
4563 if (!fileNullability.SawTypeNullability) {
4564 // If this is the first pointer declarator in the file, and the appropriate
4565 // warning is on, record it in case we need to diagnose it retroactively.
4566 diag::kind diagKind;
4567 if (pointerKind == SimplePointerKind::Array)
4568 diagKind = diag::warn_nullability_missing_array;
4569 else
4570 diagKind = diag::warn_nullability_missing;
4571
4572 if (fileNullability.PointerLoc.isInvalid() &&
4573 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
4574 fileNullability.PointerLoc = pointerLoc;
4575 fileNullability.PointerEndLoc = pointerEndLoc;
4576 fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
4577 }
4578
4579 return;
4580 }
4581
4582 // Complain about missing nullability.
4583 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc);
4584 }
4585
4586 /// Marks that a nullability feature has been used in the file containing
4587 /// \p loc.
4588 ///
4589 /// If this file already had pointer types in it that were missing nullability,
4590 /// the first such instance is retroactively diagnosed.
4591 ///
4592 /// \sa checkNullabilityConsistency
recordNullabilitySeen(Sema & S,SourceLocation loc)4593 static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
4594 FileID file = getNullabilityCompletenessCheckFileID(S, loc);
4595 if (file.isInvalid())
4596 return;
4597
4598 FileNullability &fileNullability = S.NullabilityMap[file];
4599 if (fileNullability.SawTypeNullability)
4600 return;
4601 fileNullability.SawTypeNullability = true;
4602
4603 // If we haven't seen any type nullability before, now we have. Retroactively
4604 // diagnose the first unannotated pointer, if there was one.
4605 if (fileNullability.PointerLoc.isInvalid())
4606 return;
4607
4608 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
4609 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc,
4610 fileNullability.PointerEndLoc);
4611 }
4612
4613 /// Returns true if any of the declarator chunks before \p endIndex include a
4614 /// level of indirection: array, pointer, reference, or pointer-to-member.
4615 ///
4616 /// Because declarator chunks are stored in outer-to-inner order, testing
4617 /// every chunk before \p endIndex is testing all chunks that embed the current
4618 /// chunk as part of their type.
4619 ///
4620 /// It is legal to pass the result of Declarator::getNumTypeObjects() as the
4621 /// end index, in which case all chunks are tested.
hasOuterPointerLikeChunk(const Declarator & D,unsigned endIndex)4622 static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
4623 unsigned i = endIndex;
4624 while (i != 0) {
4625 // Walk outwards along the declarator chunks.
4626 --i;
4627 const DeclaratorChunk &DC = D.getTypeObject(i);
4628 switch (DC.Kind) {
4629 case DeclaratorChunk::Paren:
4630 break;
4631 case DeclaratorChunk::Array:
4632 case DeclaratorChunk::Pointer:
4633 case DeclaratorChunk::Reference:
4634 case DeclaratorChunk::MemberPointer:
4635 return true;
4636 case DeclaratorChunk::Function:
4637 case DeclaratorChunk::BlockPointer:
4638 case DeclaratorChunk::Pipe:
4639 // These are invalid anyway, so just ignore.
4640 break;
4641 }
4642 }
4643 return false;
4644 }
4645
IsNoDerefableChunk(const DeclaratorChunk & Chunk)4646 static bool IsNoDerefableChunk(const DeclaratorChunk &Chunk) {
4647 return (Chunk.Kind == DeclaratorChunk::Pointer ||
4648 Chunk.Kind == DeclaratorChunk::Array);
4649 }
4650
4651 template<typename AttrT>
createSimpleAttr(ASTContext & Ctx,ParsedAttr & AL)4652 static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
4653 AL.setUsedAsTypeAttr();
4654 return ::new (Ctx) AttrT(Ctx, AL);
4655 }
4656
createNullabilityAttr(ASTContext & Ctx,ParsedAttr & Attr,NullabilityKind NK)4657 static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
4658 NullabilityKind NK) {
4659 switch (NK) {
4660 case NullabilityKind::NonNull:
4661 return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);
4662
4663 case NullabilityKind::Nullable:
4664 return createSimpleAttr<TypeNullableAttr>(Ctx, Attr);
4665
4666 case NullabilityKind::NullableResult:
4667 return createSimpleAttr<TypeNullableResultAttr>(Ctx, Attr);
4668
4669 case NullabilityKind::Unspecified:
4670 return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr);
4671 }
4672 llvm_unreachable("unknown NullabilityKind");
4673 }
4674
4675 // Diagnose whether this is a case with the multiple addr spaces.
4676 // Returns true if this is an invalid case.
4677 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4678 // by qualifiers for two or more different address spaces."
DiagnoseMultipleAddrSpaceAttributes(Sema & S,LangAS ASOld,LangAS ASNew,SourceLocation AttrLoc)4679 static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld,
4680 LangAS ASNew,
4681 SourceLocation AttrLoc) {
4682 if (ASOld != LangAS::Default) {
4683 if (ASOld != ASNew) {
4684 S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
4685 return true;
4686 }
4687 // Emit a warning if they are identical; it's likely unintended.
4688 S.Diag(AttrLoc,
4689 diag::warn_attribute_address_multiple_identical_qualifiers);
4690 }
4691 return false;
4692 }
4693
GetFullTypeForDeclarator(TypeProcessingState & state,QualType declSpecType,TypeSourceInfo * TInfo)4694 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
4695 QualType declSpecType,
4696 TypeSourceInfo *TInfo) {
4697 // The TypeSourceInfo that this function returns will not be a null type.
4698 // If there is an error, this function will fill in a dummy type as fallback.
4699 QualType T = declSpecType;
4700 Declarator &D = state.getDeclarator();
4701 Sema &S = state.getSema();
4702 ASTContext &Context = S.Context;
4703 const LangOptions &LangOpts = S.getLangOpts();
4704
4705 // The name we're declaring, if any.
4706 DeclarationName Name;
4707 if (D.getIdentifier())
4708 Name = D.getIdentifier();
4709
4710 // Does this declaration declare a typedef-name?
4711 bool IsTypedefName =
4712 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
4713 D.getContext() == DeclaratorContext::AliasDecl ||
4714 D.getContext() == DeclaratorContext::AliasTemplate;
4715
4716 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
4717 bool IsQualifiedFunction = T->isFunctionProtoType() &&
4718 (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() ||
4719 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
4720
4721 // If T is 'decltype(auto)', the only declarators we can have are parens
4722 // and at most one function declarator if this is a function declaration.
4723 // If T is a deduced class template specialization type, we can have no
4724 // declarator chunks at all.
4725 if (auto *DT = T->getAs<DeducedType>()) {
4726 const AutoType *AT = T->getAs<AutoType>();
4727 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
4728 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
4729 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4730 unsigned Index = E - I - 1;
4731 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
4732 unsigned DiagId = IsClassTemplateDeduction
4733 ? diag::err_deduced_class_template_compound_type
4734 : diag::err_decltype_auto_compound_type;
4735 unsigned DiagKind = 0;
4736 switch (DeclChunk.Kind) {
4737 case DeclaratorChunk::Paren:
4738 // FIXME: Rejecting this is a little silly.
4739 if (IsClassTemplateDeduction) {
4740 DiagKind = 4;
4741 break;
4742 }
4743 continue;
4744 case DeclaratorChunk::Function: {
4745 if (IsClassTemplateDeduction) {
4746 DiagKind = 3;
4747 break;
4748 }
4749 unsigned FnIndex;
4750 if (D.isFunctionDeclarationContext() &&
4751 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
4752 continue;
4753 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
4754 break;
4755 }
4756 case DeclaratorChunk::Pointer:
4757 case DeclaratorChunk::BlockPointer:
4758 case DeclaratorChunk::MemberPointer:
4759 DiagKind = 0;
4760 break;
4761 case DeclaratorChunk::Reference:
4762 DiagKind = 1;
4763 break;
4764 case DeclaratorChunk::Array:
4765 DiagKind = 2;
4766 break;
4767 case DeclaratorChunk::Pipe:
4768 break;
4769 }
4770
4771 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
4772 D.setInvalidType(true);
4773 break;
4774 }
4775 }
4776 }
4777
4778 // Determine whether we should infer _Nonnull on pointer types.
4779 std::optional<NullabilityKind> inferNullability;
4780 bool inferNullabilityCS = false;
4781 bool inferNullabilityInnerOnly = false;
4782 bool inferNullabilityInnerOnlyComplete = false;
4783
4784 // Are we in an assume-nonnull region?
4785 bool inAssumeNonNullRegion = false;
4786 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
4787 if (assumeNonNullLoc.isValid()) {
4788 inAssumeNonNullRegion = true;
4789 recordNullabilitySeen(S, assumeNonNullLoc);
4790 }
4791
4792 // Whether to complain about missing nullability specifiers or not.
4793 enum {
4794 /// Never complain.
4795 CAMN_No,
4796 /// Complain on the inner pointers (but not the outermost
4797 /// pointer).
4798 CAMN_InnerPointers,
4799 /// Complain about any pointers that don't have nullability
4800 /// specified or inferred.
4801 CAMN_Yes
4802 } complainAboutMissingNullability = CAMN_No;
4803 unsigned NumPointersRemaining = 0;
4804 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;
4805
4806 if (IsTypedefName) {
4807 // For typedefs, we do not infer any nullability (the default),
4808 // and we only complain about missing nullability specifiers on
4809 // inner pointers.
4810 complainAboutMissingNullability = CAMN_InnerPointers;
4811
4812 if (T->canHaveNullability(/*ResultIfUnknown*/ false) &&
4813 !T->getNullability()) {
4814 // Note that we allow but don't require nullability on dependent types.
4815 ++NumPointersRemaining;
4816 }
4817
4818 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
4819 DeclaratorChunk &chunk = D.getTypeObject(i);
4820 switch (chunk.Kind) {
4821 case DeclaratorChunk::Array:
4822 case DeclaratorChunk::Function:
4823 case DeclaratorChunk::Pipe:
4824 break;
4825
4826 case DeclaratorChunk::BlockPointer:
4827 case DeclaratorChunk::MemberPointer:
4828 ++NumPointersRemaining;
4829 break;
4830
4831 case DeclaratorChunk::Paren:
4832 case DeclaratorChunk::Reference:
4833 continue;
4834
4835 case DeclaratorChunk::Pointer:
4836 ++NumPointersRemaining;
4837 continue;
4838 }
4839 }
4840 } else {
4841 bool isFunctionOrMethod = false;
4842 switch (auto context = state.getDeclarator().getContext()) {
4843 case DeclaratorContext::ObjCParameter:
4844 case DeclaratorContext::ObjCResult:
4845 case DeclaratorContext::Prototype:
4846 case DeclaratorContext::TrailingReturn:
4847 case DeclaratorContext::TrailingReturnVar:
4848 isFunctionOrMethod = true;
4849 [[fallthrough]];
4850
4851 case DeclaratorContext::Member:
4852 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
4853 complainAboutMissingNullability = CAMN_No;
4854 break;
4855 }
4856
4857 // Weak properties are inferred to be nullable.
4858 if (state.getDeclarator().isObjCWeakProperty()) {
4859 // Weak properties cannot be nonnull, and should not complain about
4860 // missing nullable attributes during completeness checks.
4861 complainAboutMissingNullability = CAMN_No;
4862 if (inAssumeNonNullRegion) {
4863 inferNullability = NullabilityKind::Nullable;
4864 }
4865 break;
4866 }
4867
4868 [[fallthrough]];
4869
4870 case DeclaratorContext::File:
4871 case DeclaratorContext::KNRTypeList: {
4872 complainAboutMissingNullability = CAMN_Yes;
4873
4874 // Nullability inference depends on the type and declarator.
4875 auto wrappingKind = PointerWrappingDeclaratorKind::None;
4876 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
4877 case PointerDeclaratorKind::NonPointer:
4878 case PointerDeclaratorKind::MultiLevelPointer:
4879 // Cannot infer nullability.
4880 break;
4881
4882 case PointerDeclaratorKind::SingleLevelPointer:
4883 // Infer _Nonnull if we are in an assumes-nonnull region.
4884 if (inAssumeNonNullRegion) {
4885 complainAboutInferringWithinChunk = wrappingKind;
4886 inferNullability = NullabilityKind::NonNull;
4887 inferNullabilityCS = (context == DeclaratorContext::ObjCParameter ||
4888 context == DeclaratorContext::ObjCResult);
4889 }
4890 break;
4891
4892 case PointerDeclaratorKind::CFErrorRefPointer:
4893 case PointerDeclaratorKind::NSErrorPointerPointer:
4894 // Within a function or method signature, infer _Nullable at both
4895 // levels.
4896 if (isFunctionOrMethod && inAssumeNonNullRegion)
4897 inferNullability = NullabilityKind::Nullable;
4898 break;
4899
4900 case PointerDeclaratorKind::MaybePointerToCFRef:
4901 if (isFunctionOrMethod) {
4902 // On pointer-to-pointer parameters marked cf_returns_retained or
4903 // cf_returns_not_retained, if the outer pointer is explicit then
4904 // infer the inner pointer as _Nullable.
4905 auto hasCFReturnsAttr =
4906 [](const ParsedAttributesView &AttrList) -> bool {
4907 return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) ||
4908 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained);
4909 };
4910 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
4911 if (hasCFReturnsAttr(D.getDeclarationAttributes()) ||
4912 hasCFReturnsAttr(D.getAttributes()) ||
4913 hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
4914 hasCFReturnsAttr(D.getDeclSpec().getAttributes())) {
4915 inferNullability = NullabilityKind::Nullable;
4916 inferNullabilityInnerOnly = true;
4917 }
4918 }
4919 }
4920 break;
4921 }
4922 break;
4923 }
4924
4925 case DeclaratorContext::ConversionId:
4926 complainAboutMissingNullability = CAMN_Yes;
4927 break;
4928
4929 case DeclaratorContext::AliasDecl:
4930 case DeclaratorContext::AliasTemplate:
4931 case DeclaratorContext::Block:
4932 case DeclaratorContext::BlockLiteral:
4933 case DeclaratorContext::Condition:
4934 case DeclaratorContext::CXXCatch:
4935 case DeclaratorContext::CXXNew:
4936 case DeclaratorContext::ForInit:
4937 case DeclaratorContext::SelectionInit:
4938 case DeclaratorContext::LambdaExpr:
4939 case DeclaratorContext::LambdaExprParameter:
4940 case DeclaratorContext::ObjCCatch:
4941 case DeclaratorContext::TemplateParam:
4942 case DeclaratorContext::TemplateArg:
4943 case DeclaratorContext::TemplateTypeArg:
4944 case DeclaratorContext::TypeName:
4945 case DeclaratorContext::FunctionalCast:
4946 case DeclaratorContext::RequiresExpr:
4947 case DeclaratorContext::Association:
4948 // Don't infer in these contexts.
4949 break;
4950 }
4951 }
4952
4953 // Local function that returns true if its argument looks like a va_list.
4954 auto isVaList = [&S](QualType T) -> bool {
4955 auto *typedefTy = T->getAs<TypedefType>();
4956 if (!typedefTy)
4957 return false;
4958 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
4959 do {
4960 if (typedefTy->getDecl() == vaListTypedef)
4961 return true;
4962 if (auto *name = typedefTy->getDecl()->getIdentifier())
4963 if (name->isStr("va_list"))
4964 return true;
4965 typedefTy = typedefTy->desugar()->getAs<TypedefType>();
4966 } while (typedefTy);
4967 return false;
4968 };
4969
4970 // Local function that checks the nullability for a given pointer declarator.
4971 // Returns true if _Nonnull was inferred.
4972 auto inferPointerNullability =
4973 [&](SimplePointerKind pointerKind, SourceLocation pointerLoc,
4974 SourceLocation pointerEndLoc,
4975 ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * {
4976 // We've seen a pointer.
4977 if (NumPointersRemaining > 0)
4978 --NumPointersRemaining;
4979
4980 // If a nullability attribute is present, there's nothing to do.
4981 if (hasNullabilityAttr(attrs))
4982 return nullptr;
4983
4984 // If we're supposed to infer nullability, do so now.
4985 if (inferNullability && !inferNullabilityInnerOnlyComplete) {
4986 ParsedAttr::Form form =
4987 inferNullabilityCS
4988 ? ParsedAttr::Form::ContextSensitiveKeyword()
4989 : ParsedAttr::Form::Keyword(false /*IsAlignAs*/,
4990 false /*IsRegularKeywordAttribute*/);
4991 ParsedAttr *nullabilityAttr = Pool.create(
4992 S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
4993 nullptr, SourceLocation(), nullptr, 0, form);
4994
4995 attrs.addAtEnd(nullabilityAttr);
4996
4997 if (inferNullabilityCS) {
4998 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
4999 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
5000 }
5001
5002 if (pointerLoc.isValid() &&
5003 complainAboutInferringWithinChunk !=
5004 PointerWrappingDeclaratorKind::None) {
5005 auto Diag =
5006 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
5007 Diag << static_cast<int>(complainAboutInferringWithinChunk);
5008 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
5009 }
5010
5011 if (inferNullabilityInnerOnly)
5012 inferNullabilityInnerOnlyComplete = true;
5013 return nullabilityAttr;
5014 }
5015
5016 // If we're supposed to complain about missing nullability, do so
5017 // now if it's truly missing.
5018 switch (complainAboutMissingNullability) {
5019 case CAMN_No:
5020 break;
5021
5022 case CAMN_InnerPointers:
5023 if (NumPointersRemaining == 0)
5024 break;
5025 [[fallthrough]];
5026
5027 case CAMN_Yes:
5028 checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc);
5029 }
5030 return nullptr;
5031 };
5032
5033 // If the type itself could have nullability but does not, infer pointer
5034 // nullability and perform consistency checking.
5035 if (S.CodeSynthesisContexts.empty()) {
5036 if (T->canHaveNullability(/*ResultIfUnknown*/ false) &&
5037 !T->getNullability()) {
5038 if (isVaList(T)) {
5039 // Record that we've seen a pointer, but do nothing else.
5040 if (NumPointersRemaining > 0)
5041 --NumPointersRemaining;
5042 } else {
5043 SimplePointerKind pointerKind = SimplePointerKind::Pointer;
5044 if (T->isBlockPointerType())
5045 pointerKind = SimplePointerKind::BlockPointer;
5046 else if (T->isMemberPointerType())
5047 pointerKind = SimplePointerKind::MemberPointer;
5048
5049 if (auto *attr = inferPointerNullability(
5050 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
5051 D.getDeclSpec().getEndLoc(),
5052 D.getMutableDeclSpec().getAttributes(),
5053 D.getMutableDeclSpec().getAttributePool())) {
5054 T = state.getAttributedType(
5055 createNullabilityAttr(Context, *attr, *inferNullability), T, T);
5056 }
5057 }
5058 }
5059
5060 if (complainAboutMissingNullability == CAMN_Yes && T->isArrayType() &&
5061 !T->getNullability() && !isVaList(T) && D.isPrototypeContext() &&
5062 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
5063 checkNullabilityConsistency(S, SimplePointerKind::Array,
5064 D.getDeclSpec().getTypeSpecTypeLoc());
5065 }
5066 }
5067
5068 bool ExpectNoDerefChunk =
5069 state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref);
5070
5071 // Walk the DeclTypeInfo, building the recursive type as we go.
5072 // DeclTypeInfos are ordered from the identifier out, which is
5073 // opposite of what we want :).
5074
5075 // Track if the produced type matches the structure of the declarator.
5076 // This is used later to decide if we can fill `TypeLoc` from
5077 // `DeclaratorChunk`s. E.g. it must be false if Clang recovers from
5078 // an error by replacing the type with `int`.
5079 bool AreDeclaratorChunksValid = true;
5080 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5081 unsigned chunkIndex = e - i - 1;
5082 state.setCurrentChunkIndex(chunkIndex);
5083 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
5084 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
5085 switch (DeclType.Kind) {
5086 case DeclaratorChunk::Paren:
5087 if (i == 0)
5088 warnAboutRedundantParens(S, D, T);
5089 T = S.BuildParenType(T);
5090 break;
5091 case DeclaratorChunk::BlockPointer:
5092 // If blocks are disabled, emit an error.
5093 if (!LangOpts.Blocks)
5094 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;
5095
5096 // Handle pointer nullability.
5097 inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc,
5098 DeclType.EndLoc, DeclType.getAttrs(),
5099 state.getDeclarator().getAttributePool());
5100
5101 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
5102 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
5103 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
5104 // qualified with const.
5105 if (LangOpts.OpenCL)
5106 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
5107 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
5108 }
5109 break;
5110 case DeclaratorChunk::Pointer:
5111 // Verify that we're not building a pointer to pointer to function with
5112 // exception specification.
5113 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
5114 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
5115 D.setInvalidType(true);
5116 // Build the type anyway.
5117 }
5118
5119 // Handle pointer nullability
5120 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
5121 DeclType.EndLoc, DeclType.getAttrs(),
5122 state.getDeclarator().getAttributePool());
5123
5124 if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) {
5125 T = Context.getObjCObjectPointerType(T);
5126 if (DeclType.Ptr.TypeQuals)
5127 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
5128 break;
5129 }
5130
5131 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
5132 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
5133 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
5134 if (LangOpts.OpenCL) {
5135 if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
5136 T->isBlockPointerType()) {
5137 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
5138 D.setInvalidType(true);
5139 }
5140 }
5141
5142 T = S.BuildPointerType(T, DeclType.Loc, Name);
5143 if (DeclType.Ptr.TypeQuals)
5144 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
5145 break;
5146 case DeclaratorChunk::Reference: {
5147 // Verify that we're not building a reference to pointer to function with
5148 // exception specification.
5149 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
5150 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
5151 D.setInvalidType(true);
5152 // Build the type anyway.
5153 }
5154 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
5155
5156 if (DeclType.Ref.HasRestrict)
5157 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
5158 break;
5159 }
5160 case DeclaratorChunk::Array: {
5161 // Verify that we're not building an array of pointers to function with
5162 // exception specification.
5163 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
5164 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
5165 D.setInvalidType(true);
5166 // Build the type anyway.
5167 }
5168 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
5169 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
5170 ArraySizeModifier ASM;
5171
5172 // Microsoft property fields can have multiple sizeless array chunks
5173 // (i.e. int x[][][]). Skip all of these except one to avoid creating
5174 // bad incomplete array types.
5175 if (chunkIndex != 0 && !ArraySize &&
5176 D.getDeclSpec().getAttributes().hasMSPropertyAttr()) {
5177 // This is a sizeless chunk. If the next is also, skip this one.
5178 DeclaratorChunk &NextDeclType = D.getTypeObject(chunkIndex - 1);
5179 if (NextDeclType.Kind == DeclaratorChunk::Array &&
5180 !NextDeclType.Arr.NumElts)
5181 break;
5182 }
5183
5184 if (ATI.isStar)
5185 ASM = ArraySizeModifier::Star;
5186 else if (ATI.hasStatic)
5187 ASM = ArraySizeModifier::Static;
5188 else
5189 ASM = ArraySizeModifier::Normal;
5190 if (ASM == ArraySizeModifier::Star && !D.isPrototypeContext()) {
5191 // FIXME: This check isn't quite right: it allows star in prototypes
5192 // for function definitions, and disallows some edge cases detailed
5193 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
5194 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
5195 ASM = ArraySizeModifier::Normal;
5196 D.setInvalidType(true);
5197 }
5198
5199 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
5200 // shall appear only in a declaration of a function parameter with an
5201 // array type, ...
5202 if (ASM == ArraySizeModifier::Static || ATI.TypeQuals) {
5203 if (!(D.isPrototypeContext() ||
5204 D.getContext() == DeclaratorContext::KNRTypeList)) {
5205 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype)
5206 << (ASM == ArraySizeModifier::Static ? "'static'"
5207 : "type qualifier");
5208 // Remove the 'static' and the type qualifiers.
5209 if (ASM == ArraySizeModifier::Static)
5210 ASM = ArraySizeModifier::Normal;
5211 ATI.TypeQuals = 0;
5212 D.setInvalidType(true);
5213 }
5214
5215 // C99 6.7.5.2p1: ... and then only in the outermost array type
5216 // derivation.
5217 if (hasOuterPointerLikeChunk(D, chunkIndex)) {
5218 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost)
5219 << (ASM == ArraySizeModifier::Static ? "'static'"
5220 : "type qualifier");
5221 if (ASM == ArraySizeModifier::Static)
5222 ASM = ArraySizeModifier::Normal;
5223 ATI.TypeQuals = 0;
5224 D.setInvalidType(true);
5225 }
5226 }
5227
5228 // Array parameters can be marked nullable as well, although it's not
5229 // necessary if they're marked 'static'.
5230 if (complainAboutMissingNullability == CAMN_Yes &&
5231 !hasNullabilityAttr(DeclType.getAttrs()) &&
5232 ASM != ArraySizeModifier::Static && D.isPrototypeContext() &&
5233 !hasOuterPointerLikeChunk(D, chunkIndex)) {
5234 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
5235 }
5236
5237 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
5238 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
5239 break;
5240 }
5241 case DeclaratorChunk::Function: {
5242 // If the function declarator has a prototype (i.e. it is not () and
5243 // does not have a K&R-style identifier list), then the arguments are part
5244 // of the type, otherwise the argument list is ().
5245 DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5246 IsQualifiedFunction =
5247 FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier();
5248
5249 // Check for auto functions and trailing return type and adjust the
5250 // return type accordingly.
5251 if (!D.isInvalidType()) {
5252 // trailing-return-type is only required if we're declaring a function,
5253 // and not, for instance, a pointer to a function.
5254 if (D.getDeclSpec().hasAutoTypeSpec() &&
5255 !FTI.hasTrailingReturnType() && chunkIndex == 0) {
5256 if (!S.getLangOpts().CPlusPlus14) {
5257 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5258 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
5259 ? diag::err_auto_missing_trailing_return
5260 : diag::err_deduced_return_type);
5261 T = Context.IntTy;
5262 D.setInvalidType(true);
5263 AreDeclaratorChunksValid = false;
5264 } else {
5265 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5266 diag::warn_cxx11_compat_deduced_return_type);
5267 }
5268 } else if (FTI.hasTrailingReturnType()) {
5269 // T must be exactly 'auto' at this point. See CWG issue 681.
5270 if (isa<ParenType>(T)) {
5271 S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens)
5272 << T << D.getSourceRange();
5273 D.setInvalidType(true);
5274 // FIXME: recover and fill decls in `TypeLoc`s.
5275 AreDeclaratorChunksValid = false;
5276 } else if (D.getName().getKind() ==
5277 UnqualifiedIdKind::IK_DeductionGuideName) {
5278 if (T != Context.DependentTy) {
5279 S.Diag(D.getDeclSpec().getBeginLoc(),
5280 diag::err_deduction_guide_with_complex_decl)
5281 << D.getSourceRange();
5282 D.setInvalidType(true);
5283 // FIXME: recover and fill decls in `TypeLoc`s.
5284 AreDeclaratorChunksValid = false;
5285 }
5286 } else if (D.getContext() != DeclaratorContext::LambdaExpr &&
5287 (T.hasQualifiers() || !isa<AutoType>(T) ||
5288 cast<AutoType>(T)->getKeyword() !=
5289 AutoTypeKeyword::Auto ||
5290 cast<AutoType>(T)->isConstrained())) {
5291 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5292 diag::err_trailing_return_without_auto)
5293 << T << D.getDeclSpec().getSourceRange();
5294 D.setInvalidType(true);
5295 // FIXME: recover and fill decls in `TypeLoc`s.
5296 AreDeclaratorChunksValid = false;
5297 }
5298 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
5299 if (T.isNull()) {
5300 // An error occurred parsing the trailing return type.
5301 T = Context.IntTy;
5302 D.setInvalidType(true);
5303 } else if (AutoType *Auto = T->getContainedAutoType()) {
5304 // If the trailing return type contains an `auto`, we may need to
5305 // invent a template parameter for it, for cases like
5306 // `auto f() -> C auto` or `[](auto (*p) -> auto) {}`.
5307 InventedTemplateParameterInfo *InventedParamInfo = nullptr;
5308 if (D.getContext() == DeclaratorContext::Prototype)
5309 InventedParamInfo = &S.InventedParameterInfos.back();
5310 else if (D.getContext() == DeclaratorContext::LambdaExprParameter)
5311 InventedParamInfo = S.getCurLambda();
5312 if (InventedParamInfo) {
5313 std::tie(T, TInfo) = InventTemplateParameter(
5314 state, T, TInfo, Auto, *InventedParamInfo);
5315 }
5316 }
5317 } else {
5318 // This function type is not the type of the entity being declared,
5319 // so checking the 'auto' is not the responsibility of this chunk.
5320 }
5321 }
5322
5323 // C99 6.7.5.3p1: The return type may not be a function or array type.
5324 // For conversion functions, we'll diagnose this particular error later.
5325 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
5326 (D.getName().getKind() !=
5327 UnqualifiedIdKind::IK_ConversionFunctionId)) {
5328 unsigned diagID = diag::err_func_returning_array_function;
5329 // Last processing chunk in block context means this function chunk
5330 // represents the block.
5331 if (chunkIndex == 0 &&
5332 D.getContext() == DeclaratorContext::BlockLiteral)
5333 diagID = diag::err_block_returning_array_function;
5334 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
5335 T = Context.IntTy;
5336 D.setInvalidType(true);
5337 AreDeclaratorChunksValid = false;
5338 }
5339
5340 // Do not allow returning half FP value.
5341 // FIXME: This really should be in BuildFunctionType.
5342 if (T->isHalfType()) {
5343 if (S.getLangOpts().OpenCL) {
5344 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5345 S.getLangOpts())) {
5346 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5347 << T << 0 /*pointer hint*/;
5348 D.setInvalidType(true);
5349 }
5350 } else if (!S.getLangOpts().NativeHalfArgsAndReturns &&
5351 !S.Context.getTargetInfo().allowHalfArgsAndReturns()) {
5352 S.Diag(D.getIdentifierLoc(),
5353 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
5354 D.setInvalidType(true);
5355 }
5356 }
5357
5358 if (LangOpts.OpenCL) {
5359 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
5360 // function.
5361 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
5362 T->isPipeType()) {
5363 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5364 << T << 1 /*hint off*/;
5365 D.setInvalidType(true);
5366 }
5367 // OpenCL doesn't support variadic functions and blocks
5368 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
5369 // We also allow here any toolchain reserved identifiers.
5370 if (FTI.isVariadic &&
5371 !S.getOpenCLOptions().isAvailableOption(
5372 "__cl_clang_variadic_functions", S.getLangOpts()) &&
5373 !(D.getIdentifier() &&
5374 ((D.getIdentifier()->getName() == "printf" &&
5375 LangOpts.getOpenCLCompatibleVersion() >= 120) ||
5376 D.getIdentifier()->getName().starts_with("__")))) {
5377 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
5378 D.setInvalidType(true);
5379 }
5380 }
5381
5382 // Methods cannot return interface types. All ObjC objects are
5383 // passed by reference.
5384 if (T->isObjCObjectType()) {
5385 SourceLocation DiagLoc, FixitLoc;
5386 if (TInfo) {
5387 DiagLoc = TInfo->getTypeLoc().getBeginLoc();
5388 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc());
5389 } else {
5390 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
5391 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc());
5392 }
5393 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
5394 << 0 << T
5395 << FixItHint::CreateInsertion(FixitLoc, "*");
5396
5397 T = Context.getObjCObjectPointerType(T);
5398 if (TInfo) {
5399 TypeLocBuilder TLB;
5400 TLB.pushFullCopy(TInfo->getTypeLoc());
5401 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
5402 TLoc.setStarLoc(FixitLoc);
5403 TInfo = TLB.getTypeSourceInfo(Context, T);
5404 } else {
5405 AreDeclaratorChunksValid = false;
5406 }
5407
5408 D.setInvalidType(true);
5409 }
5410
5411 // cv-qualifiers on return types are pointless except when the type is a
5412 // class type in C++.
5413 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
5414 !(S.getLangOpts().CPlusPlus &&
5415 (T->isDependentType() || T->isRecordType()))) {
5416 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
5417 D.getFunctionDefinitionKind() ==
5418 FunctionDefinitionKind::Definition) {
5419 // [6.9.1/3] qualified void return is invalid on a C
5420 // function definition. Apparently ok on declarations and
5421 // in C++ though (!)
5422 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
5423 } else
5424 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
5425
5426 // C++2a [dcl.fct]p12:
5427 // A volatile-qualified return type is deprecated
5428 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20)
5429 S.Diag(DeclType.Loc, diag::warn_deprecated_volatile_return) << T;
5430 }
5431
5432 // Objective-C ARC ownership qualifiers are ignored on the function
5433 // return type (by type canonicalization). Complain if this attribute
5434 // was written here.
5435 if (T.getQualifiers().hasObjCLifetime()) {
5436 SourceLocation AttrLoc;
5437 if (chunkIndex + 1 < D.getNumTypeObjects()) {
5438 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
5439 for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) {
5440 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5441 AttrLoc = AL.getLoc();
5442 break;
5443 }
5444 }
5445 }
5446 if (AttrLoc.isInvalid()) {
5447 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
5448 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5449 AttrLoc = AL.getLoc();
5450 break;
5451 }
5452 }
5453 }
5454
5455 if (AttrLoc.isValid()) {
5456 // The ownership attributes are almost always written via
5457 // the predefined
5458 // __strong/__weak/__autoreleasing/__unsafe_unretained.
5459 if (AttrLoc.isMacroID())
5460 AttrLoc =
5461 S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin();
5462
5463 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
5464 << T.getQualifiers().getObjCLifetime();
5465 }
5466 }
5467
5468 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
5469 // C++ [dcl.fct]p6:
5470 // Types shall not be defined in return or parameter types.
5471 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
5472 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
5473 << Context.getTypeDeclType(Tag);
5474 }
5475
5476 // Exception specs are not allowed in typedefs. Complain, but add it
5477 // anyway.
5478 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17)
5479 S.Diag(FTI.getExceptionSpecLocBeg(),
5480 diag::err_exception_spec_in_typedef)
5481 << (D.getContext() == DeclaratorContext::AliasDecl ||
5482 D.getContext() == DeclaratorContext::AliasTemplate);
5483
5484 // If we see "T var();" or "T var(T());" at block scope, it is probably
5485 // an attempt to initialize a variable, not a function declaration.
5486 if (FTI.isAmbiguous)
5487 warnAboutAmbiguousFunction(S, D, DeclType, T);
5488
5489 FunctionType::ExtInfo EI(
5490 getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex));
5491
5492 // OpenCL disallows functions without a prototype, but it doesn't enforce
5493 // strict prototypes as in C23 because it allows a function definition to
5494 // have an identifier list. See OpenCL 3.0 6.11/g for more details.
5495 if (!FTI.NumParams && !FTI.isVariadic &&
5496 !LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL) {
5497 // Simple void foo(), where the incoming T is the result type.
5498 T = Context.getFunctionNoProtoType(T, EI);
5499 } else {
5500 // We allow a zero-parameter variadic function in C if the
5501 // function is marked with the "overloadable" attribute. Scan
5502 // for this attribute now. We also allow it in C23 per WG14 N2975.
5503 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus) {
5504 if (LangOpts.C23)
5505 S.Diag(FTI.getEllipsisLoc(),
5506 diag::warn_c17_compat_ellipsis_only_parameter);
5507 else if (!D.getDeclarationAttributes().hasAttribute(
5508 ParsedAttr::AT_Overloadable) &&
5509 !D.getAttributes().hasAttribute(
5510 ParsedAttr::AT_Overloadable) &&
5511 !D.getDeclSpec().getAttributes().hasAttribute(
5512 ParsedAttr::AT_Overloadable))
5513 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
5514 }
5515
5516 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
5517 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
5518 // definition.
5519 S.Diag(FTI.Params[0].IdentLoc,
5520 diag::err_ident_list_in_fn_declaration);
5521 D.setInvalidType(true);
5522 // Recover by creating a K&R-style function type, if possible.
5523 T = (!LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL)
5524 ? Context.getFunctionNoProtoType(T, EI)
5525 : Context.IntTy;
5526 AreDeclaratorChunksValid = false;
5527 break;
5528 }
5529
5530 FunctionProtoType::ExtProtoInfo EPI;
5531 EPI.ExtInfo = EI;
5532 EPI.Variadic = FTI.isVariadic;
5533 EPI.EllipsisLoc = FTI.getEllipsisLoc();
5534 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
5535 EPI.TypeQuals.addCVRUQualifiers(
5536 FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers()
5537 : 0);
5538 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
5539 : FTI.RefQualifierIsLValueRef? RQ_LValue
5540 : RQ_RValue;
5541
5542 // Otherwise, we have a function with a parameter list that is
5543 // potentially variadic.
5544 SmallVector<QualType, 16> ParamTys;
5545 ParamTys.reserve(FTI.NumParams);
5546
5547 SmallVector<FunctionProtoType::ExtParameterInfo, 16>
5548 ExtParameterInfos(FTI.NumParams);
5549 bool HasAnyInterestingExtParameterInfos = false;
5550
5551 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
5552 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
5553 QualType ParamTy = Param->getType();
5554 assert(!ParamTy.isNull() && "Couldn't parse type?");
5555
5556 // Look for 'void'. void is allowed only as a single parameter to a
5557 // function with no other parameters (C99 6.7.5.3p10). We record
5558 // int(void) as a FunctionProtoType with an empty parameter list.
5559 if (ParamTy->isVoidType()) {
5560 // If this is something like 'float(int, void)', reject it. 'void'
5561 // is an incomplete type (C99 6.2.5p19) and function decls cannot
5562 // have parameters of incomplete type.
5563 if (FTI.NumParams != 1 || FTI.isVariadic) {
5564 S.Diag(FTI.Params[i].IdentLoc, diag::err_void_only_param);
5565 ParamTy = Context.IntTy;
5566 Param->setType(ParamTy);
5567 } else if (FTI.Params[i].Ident) {
5568 // Reject, but continue to parse 'int(void abc)'.
5569 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
5570 ParamTy = Context.IntTy;
5571 Param->setType(ParamTy);
5572 } else {
5573 // Reject, but continue to parse 'float(const void)'.
5574 if (ParamTy.hasQualifiers())
5575 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
5576
5577 // Do not add 'void' to the list.
5578 break;
5579 }
5580 } else if (ParamTy->isHalfType()) {
5581 // Disallow half FP parameters.
5582 // FIXME: This really should be in BuildFunctionType.
5583 if (S.getLangOpts().OpenCL) {
5584 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5585 S.getLangOpts())) {
5586 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5587 << ParamTy << 0;
5588 D.setInvalidType();
5589 Param->setInvalidDecl();
5590 }
5591 } else if (!S.getLangOpts().NativeHalfArgsAndReturns &&
5592 !S.Context.getTargetInfo().allowHalfArgsAndReturns()) {
5593 S.Diag(Param->getLocation(),
5594 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
5595 D.setInvalidType();
5596 }
5597 } else if (!FTI.hasPrototype) {
5598 if (Context.isPromotableIntegerType(ParamTy)) {
5599 ParamTy = Context.getPromotedIntegerType(ParamTy);
5600 Param->setKNRPromoted(true);
5601 } else if (const BuiltinType *BTy = ParamTy->getAs<BuiltinType>()) {
5602 if (BTy->getKind() == BuiltinType::Float) {
5603 ParamTy = Context.DoubleTy;
5604 Param->setKNRPromoted(true);
5605 }
5606 }
5607 } else if (S.getLangOpts().OpenCL && ParamTy->isBlockPointerType()) {
5608 // OpenCL 2.0 s6.12.5: A block cannot be a parameter of a function.
5609 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5610 << ParamTy << 1 /*hint off*/;
5611 D.setInvalidType();
5612 }
5613
5614 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
5615 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
5616 HasAnyInterestingExtParameterInfos = true;
5617 }
5618
5619 if (auto attr = Param->getAttr<ParameterABIAttr>()) {
5620 ExtParameterInfos[i] =
5621 ExtParameterInfos[i].withABI(attr->getABI());
5622 HasAnyInterestingExtParameterInfos = true;
5623 }
5624
5625 if (Param->hasAttr<PassObjectSizeAttr>()) {
5626 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
5627 HasAnyInterestingExtParameterInfos = true;
5628 }
5629
5630 if (Param->hasAttr<NoEscapeAttr>()) {
5631 ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true);
5632 HasAnyInterestingExtParameterInfos = true;
5633 }
5634
5635 ParamTys.push_back(ParamTy);
5636 }
5637
5638 if (HasAnyInterestingExtParameterInfos) {
5639 EPI.ExtParameterInfos = ExtParameterInfos.data();
5640 checkExtParameterInfos(S, ParamTys, EPI,
5641 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
5642 }
5643
5644 SmallVector<QualType, 4> Exceptions;
5645 SmallVector<ParsedType, 2> DynamicExceptions;
5646 SmallVector<SourceRange, 2> DynamicExceptionRanges;
5647 Expr *NoexceptExpr = nullptr;
5648
5649 if (FTI.getExceptionSpecType() == EST_Dynamic) {
5650 // FIXME: It's rather inefficient to have to split into two vectors
5651 // here.
5652 unsigned N = FTI.getNumExceptions();
5653 DynamicExceptions.reserve(N);
5654 DynamicExceptionRanges.reserve(N);
5655 for (unsigned I = 0; I != N; ++I) {
5656 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
5657 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
5658 }
5659 } else if (isComputedNoexcept(FTI.getExceptionSpecType())) {
5660 NoexceptExpr = FTI.NoexceptExpr;
5661 }
5662
5663 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
5664 FTI.getExceptionSpecType(),
5665 DynamicExceptions,
5666 DynamicExceptionRanges,
5667 NoexceptExpr,
5668 Exceptions,
5669 EPI.ExceptionSpec);
5670
5671 // FIXME: Set address space from attrs for C++ mode here.
5672 // OpenCLCPlusPlus: A class member function has an address space.
5673 auto IsClassMember = [&]() {
5674 return (!state.getDeclarator().getCXXScopeSpec().isEmpty() &&
5675 state.getDeclarator()
5676 .getCXXScopeSpec()
5677 .getScopeRep()
5678 ->getKind() == NestedNameSpecifier::TypeSpec) ||
5679 state.getDeclarator().getContext() ==
5680 DeclaratorContext::Member ||
5681 state.getDeclarator().getContext() ==
5682 DeclaratorContext::LambdaExpr;
5683 };
5684
5685 if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) {
5686 LangAS ASIdx = LangAS::Default;
5687 // Take address space attr if any and mark as invalid to avoid adding
5688 // them later while creating QualType.
5689 if (FTI.MethodQualifiers)
5690 for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) {
5691 LangAS ASIdxNew = attr.asOpenCLLangAS();
5692 if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew,
5693 attr.getLoc()))
5694 D.setInvalidType(true);
5695 else
5696 ASIdx = ASIdxNew;
5697 }
5698 // If a class member function's address space is not set, set it to
5699 // __generic.
5700 LangAS AS =
5701 (ASIdx == LangAS::Default ? S.getDefaultCXXMethodAddrSpace()
5702 : ASIdx);
5703 EPI.TypeQuals.addAddressSpace(AS);
5704 }
5705 T = Context.getFunctionType(T, ParamTys, EPI);
5706 }
5707 break;
5708 }
5709 case DeclaratorChunk::MemberPointer: {
5710 // The scope spec must refer to a class, or be dependent.
5711 CXXScopeSpec &SS = DeclType.Mem.Scope();
5712 QualType ClsType;
5713
5714 // Handle pointer nullability.
5715 inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc,
5716 DeclType.EndLoc, DeclType.getAttrs(),
5717 state.getDeclarator().getAttributePool());
5718
5719 if (SS.isInvalid()) {
5720 // Avoid emitting extra errors if we already errored on the scope.
5721 D.setInvalidType(true);
5722 } else if (S.isDependentScopeSpecifier(SS) ||
5723 isa_and_nonnull<CXXRecordDecl>(S.computeDeclContext(SS))) {
5724 NestedNameSpecifier *NNS = SS.getScopeRep();
5725 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
5726 switch (NNS->getKind()) {
5727 case NestedNameSpecifier::Identifier:
5728 ClsType = Context.getDependentNameType(
5729 ElaboratedTypeKeyword::None, NNSPrefix, NNS->getAsIdentifier());
5730 break;
5731
5732 case NestedNameSpecifier::Namespace:
5733 case NestedNameSpecifier::NamespaceAlias:
5734 case NestedNameSpecifier::Global:
5735 case NestedNameSpecifier::Super:
5736 llvm_unreachable("Nested-name-specifier must name a type");
5737
5738 case NestedNameSpecifier::TypeSpec:
5739 case NestedNameSpecifier::TypeSpecWithTemplate:
5740 ClsType = QualType(NNS->getAsType(), 0);
5741 // Note: if the NNS has a prefix and ClsType is a nondependent
5742 // TemplateSpecializationType, then the NNS prefix is NOT included
5743 // in ClsType; hence we wrap ClsType into an ElaboratedType.
5744 // NOTE: in particular, no wrap occurs if ClsType already is an
5745 // Elaborated, DependentName, or DependentTemplateSpecialization.
5746 if (isa<TemplateSpecializationType>(NNS->getAsType()))
5747 ClsType = Context.getElaboratedType(ElaboratedTypeKeyword::None,
5748 NNSPrefix, ClsType);
5749 break;
5750 }
5751 } else {
5752 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
5753 diag::err_illegal_decl_mempointer_in_nonclass)
5754 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
5755 << DeclType.Mem.Scope().getRange();
5756 D.setInvalidType(true);
5757 }
5758
5759 if (!ClsType.isNull())
5760 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
5761 D.getIdentifier());
5762 else
5763 AreDeclaratorChunksValid = false;
5764
5765 if (T.isNull()) {
5766 T = Context.IntTy;
5767 D.setInvalidType(true);
5768 AreDeclaratorChunksValid = false;
5769 } else if (DeclType.Mem.TypeQuals) {
5770 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
5771 }
5772 break;
5773 }
5774
5775 case DeclaratorChunk::Pipe: {
5776 T = S.BuildReadPipeType(T, DeclType.Loc);
5777 processTypeAttrs(state, T, TAL_DeclSpec,
5778 D.getMutableDeclSpec().getAttributes());
5779 break;
5780 }
5781 }
5782
5783 if (T.isNull()) {
5784 D.setInvalidType(true);
5785 T = Context.IntTy;
5786 AreDeclaratorChunksValid = false;
5787 }
5788
5789 // See if there are any attributes on this declarator chunk.
5790 processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs(),
5791 S.IdentifyCUDATarget(D.getAttributes()));
5792
5793 if (DeclType.Kind != DeclaratorChunk::Paren) {
5794 if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType))
5795 S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array);
5796
5797 ExpectNoDerefChunk = state.didParseNoDeref();
5798 }
5799 }
5800
5801 if (ExpectNoDerefChunk)
5802 S.Diag(state.getDeclarator().getBeginLoc(),
5803 diag::warn_noderef_on_non_pointer_or_array);
5804
5805 // GNU warning -Wstrict-prototypes
5806 // Warn if a function declaration or definition is without a prototype.
5807 // This warning is issued for all kinds of unprototyped function
5808 // declarations (i.e. function type typedef, function pointer etc.)
5809 // C99 6.7.5.3p14:
5810 // The empty list in a function declarator that is not part of a definition
5811 // of that function specifies that no information about the number or types
5812 // of the parameters is supplied.
5813 // See ActOnFinishFunctionBody() and MergeFunctionDecl() for handling of
5814 // function declarations whose behavior changes in C23.
5815 if (!LangOpts.requiresStrictPrototypes()) {
5816 bool IsBlock = false;
5817 for (const DeclaratorChunk &DeclType : D.type_objects()) {
5818 switch (DeclType.Kind) {
5819 case DeclaratorChunk::BlockPointer:
5820 IsBlock = true;
5821 break;
5822 case DeclaratorChunk::Function: {
5823 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5824 // We suppress the warning when there's no LParen location, as this
5825 // indicates the declaration was an implicit declaration, which gets
5826 // warned about separately via -Wimplicit-function-declaration. We also
5827 // suppress the warning when we know the function has a prototype.
5828 if (!FTI.hasPrototype && FTI.NumParams == 0 && !FTI.isVariadic &&
5829 FTI.getLParenLoc().isValid())
5830 S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
5831 << IsBlock
5832 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
5833 IsBlock = false;
5834 break;
5835 }
5836 default:
5837 break;
5838 }
5839 }
5840 }
5841
5842 assert(!T.isNull() && "T must not be null after this point");
5843
5844 if (LangOpts.CPlusPlus && T->isFunctionType()) {
5845 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
5846 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
5847
5848 // C++ 8.3.5p4:
5849 // A cv-qualifier-seq shall only be part of the function type
5850 // for a nonstatic member function, the function type to which a pointer
5851 // to member refers, or the top-level function type of a function typedef
5852 // declaration.
5853 //
5854 // Core issue 547 also allows cv-qualifiers on function types that are
5855 // top-level template type arguments.
5856 enum {
5857 NonMember,
5858 Member,
5859 ExplicitObjectMember,
5860 DeductionGuide
5861 } Kind = NonMember;
5862 if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName)
5863 Kind = DeductionGuide;
5864 else if (!D.getCXXScopeSpec().isSet()) {
5865 if ((D.getContext() == DeclaratorContext::Member ||
5866 D.getContext() == DeclaratorContext::LambdaExpr) &&
5867 !D.getDeclSpec().isFriendSpecified())
5868 Kind = Member;
5869 } else {
5870 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
5871 if (!DC || DC->isRecord())
5872 Kind = Member;
5873 }
5874
5875 if (Kind == Member) {
5876 unsigned I;
5877 if (D.isFunctionDeclarator(I)) {
5878 const DeclaratorChunk &Chunk = D.getTypeObject(I);
5879 if (Chunk.Fun.NumParams) {
5880 auto *P = dyn_cast_or_null<ParmVarDecl>(Chunk.Fun.Params->Param);
5881 if (P && P->isExplicitObjectParameter())
5882 Kind = ExplicitObjectMember;
5883 }
5884 }
5885 }
5886
5887 // C++11 [dcl.fct]p6 (w/DR1417):
5888 // An attempt to specify a function type with a cv-qualifier-seq or a
5889 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
5890 // - the function type for a non-static member function,
5891 // - the function type to which a pointer to member refers,
5892 // - the top-level function type of a function typedef declaration or
5893 // alias-declaration,
5894 // - the type-id in the default argument of a type-parameter, or
5895 // - the type-id of a template-argument for a type-parameter
5896 //
5897 // FIXME: Checking this here is insufficient. We accept-invalid on:
5898 //
5899 // template<typename T> struct S { void f(T); };
5900 // S<int() const> s;
5901 //
5902 // ... for instance.
5903 if (IsQualifiedFunction &&
5904 !(Kind == Member && !D.isExplicitObjectMemberFunction() &&
5905 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
5906 !IsTypedefName && D.getContext() != DeclaratorContext::TemplateArg &&
5907 D.getContext() != DeclaratorContext::TemplateTypeArg) {
5908 SourceLocation Loc = D.getBeginLoc();
5909 SourceRange RemovalRange;
5910 unsigned I;
5911 if (D.isFunctionDeclarator(I)) {
5912 SmallVector<SourceLocation, 4> RemovalLocs;
5913 const DeclaratorChunk &Chunk = D.getTypeObject(I);
5914 assert(Chunk.Kind == DeclaratorChunk::Function);
5915
5916 if (Chunk.Fun.hasRefQualifier())
5917 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
5918
5919 if (Chunk.Fun.hasMethodTypeQualifiers())
5920 Chunk.Fun.MethodQualifiers->forEachQualifier(
5921 [&](DeclSpec::TQ TypeQual, StringRef QualName,
5922 SourceLocation SL) { RemovalLocs.push_back(SL); });
5923
5924 if (!RemovalLocs.empty()) {
5925 llvm::sort(RemovalLocs,
5926 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
5927 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
5928 Loc = RemovalLocs.front();
5929 }
5930 }
5931
5932 S.Diag(Loc, diag::err_invalid_qualified_function_type)
5933 << Kind << D.isFunctionDeclarator() << T
5934 << getFunctionQualifiersAsString(FnTy)
5935 << FixItHint::CreateRemoval(RemovalRange);
5936
5937 // Strip the cv-qualifiers and ref-qualifiers from the type.
5938 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
5939 EPI.TypeQuals.removeCVRQualifiers();
5940 EPI.RefQualifier = RQ_None;
5941
5942 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
5943 EPI);
5944 // Rebuild any parens around the identifier in the function type.
5945 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5946 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
5947 break;
5948 T = S.BuildParenType(T);
5949 }
5950 }
5951 }
5952
5953 // Apply any undistributed attributes from the declaration or declarator.
5954 ParsedAttributesView NonSlidingAttrs;
5955 for (ParsedAttr &AL : D.getDeclarationAttributes()) {
5956 if (!AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
5957 NonSlidingAttrs.addAtEnd(&AL);
5958 }
5959 }
5960 processTypeAttrs(state, T, TAL_DeclName, NonSlidingAttrs);
5961 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());
5962
5963 // Diagnose any ignored type attributes.
5964 state.diagnoseIgnoredTypeAttrs(T);
5965
5966 // C++0x [dcl.constexpr]p9:
5967 // A constexpr specifier used in an object declaration declares the object
5968 // as const.
5969 if (D.getDeclSpec().getConstexprSpecifier() == ConstexprSpecKind::Constexpr &&
5970 T->isObjectType())
5971 T.addConst();
5972
5973 // C++2a [dcl.fct]p4:
5974 // A parameter with volatile-qualified type is deprecated
5975 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20 &&
5976 (D.getContext() == DeclaratorContext::Prototype ||
5977 D.getContext() == DeclaratorContext::LambdaExprParameter))
5978 S.Diag(D.getIdentifierLoc(), diag::warn_deprecated_volatile_param) << T;
5979
5980 // If there was an ellipsis in the declarator, the declaration declares a
5981 // parameter pack whose type may be a pack expansion type.
5982 if (D.hasEllipsis()) {
5983 // C++0x [dcl.fct]p13:
5984 // A declarator-id or abstract-declarator containing an ellipsis shall
5985 // only be used in a parameter-declaration. Such a parameter-declaration
5986 // is a parameter pack (14.5.3). [...]
5987 switch (D.getContext()) {
5988 case DeclaratorContext::Prototype:
5989 case DeclaratorContext::LambdaExprParameter:
5990 case DeclaratorContext::RequiresExpr:
5991 // C++0x [dcl.fct]p13:
5992 // [...] When it is part of a parameter-declaration-clause, the
5993 // parameter pack is a function parameter pack (14.5.3). The type T
5994 // of the declarator-id of the function parameter pack shall contain
5995 // a template parameter pack; each template parameter pack in T is
5996 // expanded by the function parameter pack.
5997 //
5998 // We represent function parameter packs as function parameters whose
5999 // type is a pack expansion.
6000 if (!T->containsUnexpandedParameterPack() &&
6001 (!LangOpts.CPlusPlus20 || !T->getContainedAutoType())) {
6002 S.Diag(D.getEllipsisLoc(),
6003 diag::err_function_parameter_pack_without_parameter_packs)
6004 << T << D.getSourceRange();
6005 D.setEllipsisLoc(SourceLocation());
6006 } else {
6007 T = Context.getPackExpansionType(T, std::nullopt,
6008 /*ExpectPackInType=*/false);
6009 }
6010 break;
6011 case DeclaratorContext::TemplateParam:
6012 // C++0x [temp.param]p15:
6013 // If a template-parameter is a [...] is a parameter-declaration that
6014 // declares a parameter pack (8.3.5), then the template-parameter is a
6015 // template parameter pack (14.5.3).
6016 //
6017 // Note: core issue 778 clarifies that, if there are any unexpanded
6018 // parameter packs in the type of the non-type template parameter, then
6019 // it expands those parameter packs.
6020 if (T->containsUnexpandedParameterPack())
6021 T = Context.getPackExpansionType(T, std::nullopt);
6022 else
6023 S.Diag(D.getEllipsisLoc(),
6024 LangOpts.CPlusPlus11
6025 ? diag::warn_cxx98_compat_variadic_templates
6026 : diag::ext_variadic_templates);
6027 break;
6028
6029 case DeclaratorContext::File:
6030 case DeclaratorContext::KNRTypeList:
6031 case DeclaratorContext::ObjCParameter: // FIXME: special diagnostic here?
6032 case DeclaratorContext::ObjCResult: // FIXME: special diagnostic here?
6033 case DeclaratorContext::TypeName:
6034 case DeclaratorContext::FunctionalCast:
6035 case DeclaratorContext::CXXNew:
6036 case DeclaratorContext::AliasDecl:
6037 case DeclaratorContext::AliasTemplate:
6038 case DeclaratorContext::Member:
6039 case DeclaratorContext::Block:
6040 case DeclaratorContext::ForInit:
6041 case DeclaratorContext::SelectionInit:
6042 case DeclaratorContext::Condition:
6043 case DeclaratorContext::CXXCatch:
6044 case DeclaratorContext::ObjCCatch:
6045 case DeclaratorContext::BlockLiteral:
6046 case DeclaratorContext::LambdaExpr:
6047 case DeclaratorContext::ConversionId:
6048 case DeclaratorContext::TrailingReturn:
6049 case DeclaratorContext::TrailingReturnVar:
6050 case DeclaratorContext::TemplateArg:
6051 case DeclaratorContext::TemplateTypeArg:
6052 case DeclaratorContext::Association:
6053 // FIXME: We may want to allow parameter packs in block-literal contexts
6054 // in the future.
6055 S.Diag(D.getEllipsisLoc(),
6056 diag::err_ellipsis_in_declarator_not_parameter);
6057 D.setEllipsisLoc(SourceLocation());
6058 break;
6059 }
6060 }
6061
6062 assert(!T.isNull() && "T must not be null at the end of this function");
6063 if (!AreDeclaratorChunksValid)
6064 return Context.getTrivialTypeSourceInfo(T);
6065 return GetTypeSourceInfoForDeclarator(state, T, TInfo);
6066 }
6067
6068 /// GetTypeForDeclarator - Convert the type for the specified
6069 /// declarator to Type instances.
6070 ///
6071 /// The result of this call will never be null, but the associated
6072 /// type may be a null type if there's an unrecoverable error.
GetTypeForDeclarator(Declarator & D)6073 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D) {
6074 // Determine the type of the declarator. Not all forms of declarator
6075 // have a type.
6076
6077 TypeProcessingState state(*this, D);
6078
6079 TypeSourceInfo *ReturnTypeInfo = nullptr;
6080 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
6081 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
6082 inferARCWriteback(state, T);
6083
6084 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
6085 }
6086
transferARCOwnershipToDeclSpec(Sema & S,QualType & declSpecTy,Qualifiers::ObjCLifetime ownership)6087 static void transferARCOwnershipToDeclSpec(Sema &S,
6088 QualType &declSpecTy,
6089 Qualifiers::ObjCLifetime ownership) {
6090 if (declSpecTy->isObjCRetainableType() &&
6091 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
6092 Qualifiers qs;
6093 qs.addObjCLifetime(ownership);
6094 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
6095 }
6096 }
6097
transferARCOwnershipToDeclaratorChunk(TypeProcessingState & state,Qualifiers::ObjCLifetime ownership,unsigned chunkIndex)6098 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
6099 Qualifiers::ObjCLifetime ownership,
6100 unsigned chunkIndex) {
6101 Sema &S = state.getSema();
6102 Declarator &D = state.getDeclarator();
6103
6104 // Look for an explicit lifetime attribute.
6105 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
6106 if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership))
6107 return;
6108
6109 const char *attrStr = nullptr;
6110 switch (ownership) {
6111 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
6112 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
6113 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
6114 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
6115 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
6116 }
6117
6118 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
6119 Arg->Ident = &S.Context.Idents.get(attrStr);
6120 Arg->Loc = SourceLocation();
6121
6122 ArgsUnion Args(Arg);
6123
6124 // If there wasn't one, add one (with an invalid source location
6125 // so that we don't make an AttributedType for it).
6126 ParsedAttr *attr = D.getAttributePool().create(
6127 &S.Context.Idents.get("objc_ownership"), SourceLocation(),
6128 /*scope*/ nullptr, SourceLocation(),
6129 /*args*/ &Args, 1, ParsedAttr::Form::GNU());
6130 chunk.getAttrs().addAtEnd(attr);
6131 // TODO: mark whether we did this inference?
6132 }
6133
6134 /// Used for transferring ownership in casts resulting in l-values.
transferARCOwnership(TypeProcessingState & state,QualType & declSpecTy,Qualifiers::ObjCLifetime ownership)6135 static void transferARCOwnership(TypeProcessingState &state,
6136 QualType &declSpecTy,
6137 Qualifiers::ObjCLifetime ownership) {
6138 Sema &S = state.getSema();
6139 Declarator &D = state.getDeclarator();
6140
6141 int inner = -1;
6142 bool hasIndirection = false;
6143 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
6144 DeclaratorChunk &chunk = D.getTypeObject(i);
6145 switch (chunk.Kind) {
6146 case DeclaratorChunk::Paren:
6147 // Ignore parens.
6148 break;
6149
6150 case DeclaratorChunk::Array:
6151 case DeclaratorChunk::Reference:
6152 case DeclaratorChunk::Pointer:
6153 if (inner != -1)
6154 hasIndirection = true;
6155 inner = i;
6156 break;
6157
6158 case DeclaratorChunk::BlockPointer:
6159 if (inner != -1)
6160 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
6161 return;
6162
6163 case DeclaratorChunk::Function:
6164 case DeclaratorChunk::MemberPointer:
6165 case DeclaratorChunk::Pipe:
6166 return;
6167 }
6168 }
6169
6170 if (inner == -1)
6171 return;
6172
6173 DeclaratorChunk &chunk = D.getTypeObject(inner);
6174 if (chunk.Kind == DeclaratorChunk::Pointer) {
6175 if (declSpecTy->isObjCRetainableType())
6176 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
6177 if (declSpecTy->isObjCObjectType() && hasIndirection)
6178 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
6179 } else {
6180 assert(chunk.Kind == DeclaratorChunk::Array ||
6181 chunk.Kind == DeclaratorChunk::Reference);
6182 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
6183 }
6184 }
6185
GetTypeForDeclaratorCast(Declarator & D,QualType FromTy)6186 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
6187 TypeProcessingState state(*this, D);
6188
6189 TypeSourceInfo *ReturnTypeInfo = nullptr;
6190 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
6191
6192 if (getLangOpts().ObjC) {
6193 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
6194 if (ownership != Qualifiers::OCL_None)
6195 transferARCOwnership(state, declSpecTy, ownership);
6196 }
6197
6198 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
6199 }
6200
fillAttributedTypeLoc(AttributedTypeLoc TL,TypeProcessingState & State)6201 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
6202 TypeProcessingState &State) {
6203 TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr()));
6204 }
6205
fillMatrixTypeLoc(MatrixTypeLoc MTL,const ParsedAttributesView & Attrs)6206 static void fillMatrixTypeLoc(MatrixTypeLoc MTL,
6207 const ParsedAttributesView &Attrs) {
6208 for (const ParsedAttr &AL : Attrs) {
6209 if (AL.getKind() == ParsedAttr::AT_MatrixType) {
6210 MTL.setAttrNameLoc(AL.getLoc());
6211 MTL.setAttrRowOperand(AL.getArgAsExpr(0));
6212 MTL.setAttrColumnOperand(AL.getArgAsExpr(1));
6213 MTL.setAttrOperandParensRange(SourceRange());
6214 return;
6215 }
6216 }
6217
6218 llvm_unreachable("no matrix_type attribute found at the expected location!");
6219 }
6220
6221 namespace {
6222 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
6223 Sema &SemaRef;
6224 ASTContext &Context;
6225 TypeProcessingState &State;
6226 const DeclSpec &DS;
6227
6228 public:
TypeSpecLocFiller(Sema & S,ASTContext & Context,TypeProcessingState & State,const DeclSpec & DS)6229 TypeSpecLocFiller(Sema &S, ASTContext &Context, TypeProcessingState &State,
6230 const DeclSpec &DS)
6231 : SemaRef(S), Context(Context), State(State), DS(DS) {}
6232
VisitAttributedTypeLoc(AttributedTypeLoc TL)6233 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
6234 Visit(TL.getModifiedLoc());
6235 fillAttributedTypeLoc(TL, State);
6236 }
VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL)6237 void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
6238 Visit(TL.getWrappedLoc());
6239 }
VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL)6240 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
6241 Visit(TL.getInnerLoc());
6242 TL.setExpansionLoc(
6243 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
6244 }
VisitQualifiedTypeLoc(QualifiedTypeLoc TL)6245 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
6246 Visit(TL.getUnqualifiedLoc());
6247 }
6248 // Allow to fill pointee's type locations, e.g.,
6249 // int __attr * __attr * __attr *p;
VisitPointerTypeLoc(PointerTypeLoc TL)6250 void VisitPointerTypeLoc(PointerTypeLoc TL) { Visit(TL.getNextTypeLoc()); }
VisitTypedefTypeLoc(TypedefTypeLoc TL)6251 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
6252 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6253 }
VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL)6254 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
6255 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6256 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
6257 // addition field. What we have is good enough for display of location
6258 // of 'fixit' on interface name.
6259 TL.setNameEndLoc(DS.getEndLoc());
6260 }
VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL)6261 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
6262 TypeSourceInfo *RepTInfo = nullptr;
6263 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
6264 TL.copy(RepTInfo->getTypeLoc());
6265 }
VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL)6266 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
6267 TypeSourceInfo *RepTInfo = nullptr;
6268 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
6269 TL.copy(RepTInfo->getTypeLoc());
6270 }
VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL)6271 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
6272 TypeSourceInfo *TInfo = nullptr;
6273 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6274
6275 // If we got no declarator info from previous Sema routines,
6276 // just fill with the typespec loc.
6277 if (!TInfo) {
6278 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
6279 return;
6280 }
6281
6282 TypeLoc OldTL = TInfo->getTypeLoc();
6283 if (TInfo->getType()->getAs<ElaboratedType>()) {
6284 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
6285 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
6286 .castAs<TemplateSpecializationTypeLoc>();
6287 TL.copy(NamedTL);
6288 } else {
6289 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
6290 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc());
6291 }
6292
6293 }
VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL)6294 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
6295 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr ||
6296 DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualExpr);
6297 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
6298 TL.setParensRange(DS.getTypeofParensRange());
6299 }
VisitTypeOfTypeLoc(TypeOfTypeLoc TL)6300 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
6301 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType ||
6302 DS.getTypeSpecType() == DeclSpec::TST_typeof_unqualType);
6303 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
6304 TL.setParensRange(DS.getTypeofParensRange());
6305 assert(DS.getRepAsType());
6306 TypeSourceInfo *TInfo = nullptr;
6307 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6308 TL.setUnmodifiedTInfo(TInfo);
6309 }
VisitDecltypeTypeLoc(DecltypeTypeLoc TL)6310 void VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
6311 assert(DS.getTypeSpecType() == DeclSpec::TST_decltype);
6312 TL.setDecltypeLoc(DS.getTypeSpecTypeLoc());
6313 TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
6314 }
VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL)6315 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
6316 assert(DS.isTransformTypeTrait(DS.getTypeSpecType()));
6317 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6318 TL.setParensRange(DS.getTypeofParensRange());
6319 assert(DS.getRepAsType());
6320 TypeSourceInfo *TInfo = nullptr;
6321 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6322 TL.setUnderlyingTInfo(TInfo);
6323 }
VisitBuiltinTypeLoc(BuiltinTypeLoc TL)6324 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
6325 // By default, use the source location of the type specifier.
6326 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
6327 if (TL.needsExtraLocalData()) {
6328 // Set info for the written builtin specifiers.
6329 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
6330 // Try to have a meaningful source location.
6331 if (TL.getWrittenSignSpec() != TypeSpecifierSign::Unspecified)
6332 TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
6333 if (TL.getWrittenWidthSpec() != TypeSpecifierWidth::Unspecified)
6334 TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
6335 }
6336 }
VisitElaboratedTypeLoc(ElaboratedTypeLoc TL)6337 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
6338 if (DS.getTypeSpecType() == TST_typename) {
6339 TypeSourceInfo *TInfo = nullptr;
6340 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6341 if (TInfo)
6342 if (auto ETL = TInfo->getTypeLoc().getAs<ElaboratedTypeLoc>()) {
6343 TL.copy(ETL);
6344 return;
6345 }
6346 }
6347 const ElaboratedType *T = TL.getTypePtr();
6348 TL.setElaboratedKeywordLoc(T->getKeyword() != ElaboratedTypeKeyword::None
6349 ? DS.getTypeSpecTypeLoc()
6350 : SourceLocation());
6351 const CXXScopeSpec& SS = DS.getTypeSpecScope();
6352 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6353 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
6354 }
VisitDependentNameTypeLoc(DependentNameTypeLoc TL)6355 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
6356 assert(DS.getTypeSpecType() == TST_typename);
6357 TypeSourceInfo *TInfo = nullptr;
6358 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6359 assert(TInfo);
6360 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
6361 }
VisitDependentTemplateSpecializationTypeLoc(DependentTemplateSpecializationTypeLoc TL)6362 void VisitDependentTemplateSpecializationTypeLoc(
6363 DependentTemplateSpecializationTypeLoc TL) {
6364 assert(DS.getTypeSpecType() == TST_typename);
6365 TypeSourceInfo *TInfo = nullptr;
6366 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6367 assert(TInfo);
6368 TL.copy(
6369 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
6370 }
VisitAutoTypeLoc(AutoTypeLoc TL)6371 void VisitAutoTypeLoc(AutoTypeLoc TL) {
6372 assert(DS.getTypeSpecType() == TST_auto ||
6373 DS.getTypeSpecType() == TST_decltype_auto ||
6374 DS.getTypeSpecType() == TST_auto_type ||
6375 DS.getTypeSpecType() == TST_unspecified);
6376 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6377 if (DS.getTypeSpecType() == TST_decltype_auto)
6378 TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
6379 if (!DS.isConstrainedAuto())
6380 return;
6381 TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId();
6382 if (!TemplateId)
6383 return;
6384
6385 NestedNameSpecifierLoc NNS =
6386 (DS.getTypeSpecScope().isNotEmpty()
6387 ? DS.getTypeSpecScope().getWithLocInContext(Context)
6388 : NestedNameSpecifierLoc());
6389 TemplateArgumentListInfo TemplateArgsInfo(TemplateId->LAngleLoc,
6390 TemplateId->RAngleLoc);
6391 if (TemplateId->NumArgs > 0) {
6392 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
6393 TemplateId->NumArgs);
6394 SemaRef.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
6395 }
6396 DeclarationNameInfo DNI = DeclarationNameInfo(
6397 TL.getTypePtr()->getTypeConstraintConcept()->getDeclName(),
6398 TemplateId->TemplateNameLoc);
6399 auto *CR = ConceptReference::Create(
6400 Context, NNS, TemplateId->TemplateKWLoc, DNI,
6401 /*FoundDecl=*/nullptr,
6402 /*NamedDecl=*/TL.getTypePtr()->getTypeConstraintConcept(),
6403 ASTTemplateArgumentListInfo::Create(Context, TemplateArgsInfo));
6404 TL.setConceptReference(CR);
6405 }
VisitTagTypeLoc(TagTypeLoc TL)6406 void VisitTagTypeLoc(TagTypeLoc TL) {
6407 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
6408 }
VisitAtomicTypeLoc(AtomicTypeLoc TL)6409 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
6410 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
6411 // or an _Atomic qualifier.
6412 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
6413 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6414 TL.setParensRange(DS.getTypeofParensRange());
6415
6416 TypeSourceInfo *TInfo = nullptr;
6417 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6418 assert(TInfo);
6419 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6420 } else {
6421 TL.setKWLoc(DS.getAtomicSpecLoc());
6422 // No parens, to indicate this was spelled as an _Atomic qualifier.
6423 TL.setParensRange(SourceRange());
6424 Visit(TL.getValueLoc());
6425 }
6426 }
6427
VisitPipeTypeLoc(PipeTypeLoc TL)6428 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6429 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6430
6431 TypeSourceInfo *TInfo = nullptr;
6432 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6433 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6434 }
6435
VisitExtIntTypeLoc(BitIntTypeLoc TL)6436 void VisitExtIntTypeLoc(BitIntTypeLoc TL) {
6437 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6438 }
6439
VisitDependentExtIntTypeLoc(DependentBitIntTypeLoc TL)6440 void VisitDependentExtIntTypeLoc(DependentBitIntTypeLoc TL) {
6441 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6442 }
6443
VisitTypeLoc(TypeLoc TL)6444 void VisitTypeLoc(TypeLoc TL) {
6445 // FIXME: add other typespec types and change this to an assert.
6446 TL.initialize(Context, DS.getTypeSpecTypeLoc());
6447 }
6448 };
6449
6450 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
6451 ASTContext &Context;
6452 TypeProcessingState &State;
6453 const DeclaratorChunk &Chunk;
6454
6455 public:
DeclaratorLocFiller(ASTContext & Context,TypeProcessingState & State,const DeclaratorChunk & Chunk)6456 DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State,
6457 const DeclaratorChunk &Chunk)
6458 : Context(Context), State(State), Chunk(Chunk) {}
6459
VisitQualifiedTypeLoc(QualifiedTypeLoc TL)6460 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
6461 llvm_unreachable("qualified type locs not expected here!");
6462 }
VisitDecayedTypeLoc(DecayedTypeLoc TL)6463 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
6464 llvm_unreachable("decayed type locs not expected here!");
6465 }
6466
VisitAttributedTypeLoc(AttributedTypeLoc TL)6467 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
6468 fillAttributedTypeLoc(TL, State);
6469 }
VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL)6470 void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
6471 // nothing
6472 }
VisitAdjustedTypeLoc(AdjustedTypeLoc TL)6473 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
6474 // nothing
6475 }
VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL)6476 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
6477 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
6478 TL.setCaretLoc(Chunk.Loc);
6479 }
VisitPointerTypeLoc(PointerTypeLoc TL)6480 void VisitPointerTypeLoc(PointerTypeLoc TL) {
6481 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6482 TL.setStarLoc(Chunk.Loc);
6483 }
VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL)6484 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
6485 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6486 TL.setStarLoc(Chunk.Loc);
6487 }
VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL)6488 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
6489 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
6490 const CXXScopeSpec& SS = Chunk.Mem.Scope();
6491 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
6492
6493 const Type* ClsTy = TL.getClass();
6494 QualType ClsQT = QualType(ClsTy, 0);
6495 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
6496 // Now copy source location info into the type loc component.
6497 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
6498 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
6499 case NestedNameSpecifier::Identifier:
6500 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
6501 {
6502 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
6503 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
6504 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
6505 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
6506 }
6507 break;
6508
6509 case NestedNameSpecifier::TypeSpec:
6510 case NestedNameSpecifier::TypeSpecWithTemplate:
6511 if (isa<ElaboratedType>(ClsTy)) {
6512 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
6513 ETLoc.setElaboratedKeywordLoc(SourceLocation());
6514 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
6515 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
6516 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
6517 } else {
6518 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
6519 }
6520 break;
6521
6522 case NestedNameSpecifier::Namespace:
6523 case NestedNameSpecifier::NamespaceAlias:
6524 case NestedNameSpecifier::Global:
6525 case NestedNameSpecifier::Super:
6526 llvm_unreachable("Nested-name-specifier must name a type");
6527 }
6528
6529 // Finally fill in MemberPointerLocInfo fields.
6530 TL.setStarLoc(Chunk.Mem.StarLoc);
6531 TL.setClassTInfo(ClsTInfo);
6532 }
VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL)6533 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
6534 assert(Chunk.Kind == DeclaratorChunk::Reference);
6535 // 'Amp' is misleading: this might have been originally
6536 /// spelled with AmpAmp.
6537 TL.setAmpLoc(Chunk.Loc);
6538 }
VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL)6539 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
6540 assert(Chunk.Kind == DeclaratorChunk::Reference);
6541 assert(!Chunk.Ref.LValueRef);
6542 TL.setAmpAmpLoc(Chunk.Loc);
6543 }
VisitArrayTypeLoc(ArrayTypeLoc TL)6544 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
6545 assert(Chunk.Kind == DeclaratorChunk::Array);
6546 TL.setLBracketLoc(Chunk.Loc);
6547 TL.setRBracketLoc(Chunk.EndLoc);
6548 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
6549 }
VisitFunctionTypeLoc(FunctionTypeLoc TL)6550 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
6551 assert(Chunk.Kind == DeclaratorChunk::Function);
6552 TL.setLocalRangeBegin(Chunk.Loc);
6553 TL.setLocalRangeEnd(Chunk.EndLoc);
6554
6555 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
6556 TL.setLParenLoc(FTI.getLParenLoc());
6557 TL.setRParenLoc(FTI.getRParenLoc());
6558 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
6559 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
6560 TL.setParam(tpi++, Param);
6561 }
6562 TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
6563 }
VisitParenTypeLoc(ParenTypeLoc TL)6564 void VisitParenTypeLoc(ParenTypeLoc TL) {
6565 assert(Chunk.Kind == DeclaratorChunk::Paren);
6566 TL.setLParenLoc(Chunk.Loc);
6567 TL.setRParenLoc(Chunk.EndLoc);
6568 }
VisitPipeTypeLoc(PipeTypeLoc TL)6569 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6570 assert(Chunk.Kind == DeclaratorChunk::Pipe);
6571 TL.setKWLoc(Chunk.Loc);
6572 }
VisitBitIntTypeLoc(BitIntTypeLoc TL)6573 void VisitBitIntTypeLoc(BitIntTypeLoc TL) {
6574 TL.setNameLoc(Chunk.Loc);
6575 }
VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL)6576 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
6577 TL.setExpansionLoc(Chunk.Loc);
6578 }
VisitVectorTypeLoc(VectorTypeLoc TL)6579 void VisitVectorTypeLoc(VectorTypeLoc TL) { TL.setNameLoc(Chunk.Loc); }
VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL)6580 void VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL) {
6581 TL.setNameLoc(Chunk.Loc);
6582 }
VisitExtVectorTypeLoc(ExtVectorTypeLoc TL)6583 void VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
6584 TL.setNameLoc(Chunk.Loc);
6585 }
6586 void
VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL)6587 VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL) {
6588 TL.setNameLoc(Chunk.Loc);
6589 }
VisitMatrixTypeLoc(MatrixTypeLoc TL)6590 void VisitMatrixTypeLoc(MatrixTypeLoc TL) {
6591 fillMatrixTypeLoc(TL, Chunk.getAttrs());
6592 }
6593
VisitTypeLoc(TypeLoc TL)6594 void VisitTypeLoc(TypeLoc TL) {
6595 llvm_unreachable("unsupported TypeLoc kind in declarator!");
6596 }
6597 };
6598 } // end anonymous namespace
6599
fillAtomicQualLoc(AtomicTypeLoc ATL,const DeclaratorChunk & Chunk)6600 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
6601 SourceLocation Loc;
6602 switch (Chunk.Kind) {
6603 case DeclaratorChunk::Function:
6604 case DeclaratorChunk::Array:
6605 case DeclaratorChunk::Paren:
6606 case DeclaratorChunk::Pipe:
6607 llvm_unreachable("cannot be _Atomic qualified");
6608
6609 case DeclaratorChunk::Pointer:
6610 Loc = Chunk.Ptr.AtomicQualLoc;
6611 break;
6612
6613 case DeclaratorChunk::BlockPointer:
6614 case DeclaratorChunk::Reference:
6615 case DeclaratorChunk::MemberPointer:
6616 // FIXME: Provide a source location for the _Atomic keyword.
6617 break;
6618 }
6619
6620 ATL.setKWLoc(Loc);
6621 ATL.setParensRange(SourceRange());
6622 }
6623
6624 static void
fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,const ParsedAttributesView & Attrs)6625 fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,
6626 const ParsedAttributesView &Attrs) {
6627 for (const ParsedAttr &AL : Attrs) {
6628 if (AL.getKind() == ParsedAttr::AT_AddressSpace) {
6629 DASTL.setAttrNameLoc(AL.getLoc());
6630 DASTL.setAttrExprOperand(AL.getArgAsExpr(0));
6631 DASTL.setAttrOperandParensRange(SourceRange());
6632 return;
6633 }
6634 }
6635
6636 llvm_unreachable(
6637 "no address_space attribute found at the expected location!");
6638 }
6639
6640 /// Create and instantiate a TypeSourceInfo with type source information.
6641 ///
6642 /// \param T QualType referring to the type as written in source code.
6643 ///
6644 /// \param ReturnTypeInfo For declarators whose return type does not show
6645 /// up in the normal place in the declaration specifiers (such as a C++
6646 /// conversion function), this pointer will refer to a type source information
6647 /// for that return type.
6648 static TypeSourceInfo *
GetTypeSourceInfoForDeclarator(TypeProcessingState & State,QualType T,TypeSourceInfo * ReturnTypeInfo)6649 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
6650 QualType T, TypeSourceInfo *ReturnTypeInfo) {
6651 Sema &S = State.getSema();
6652 Declarator &D = State.getDeclarator();
6653
6654 TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T);
6655 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
6656
6657 // Handle parameter packs whose type is a pack expansion.
6658 if (isa<PackExpansionType>(T)) {
6659 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
6660 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6661 }
6662
6663 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
6664 // Microsoft property fields can have multiple sizeless array chunks
6665 // (i.e. int x[][][]). Don't create more than one level of incomplete array.
6666 if (CurrTL.getTypeLocClass() == TypeLoc::IncompleteArray && e != 1 &&
6667 D.getDeclSpec().getAttributes().hasMSPropertyAttr())
6668 continue;
6669
6670 // An AtomicTypeLoc might be produced by an atomic qualifier in this
6671 // declarator chunk.
6672 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
6673 fillAtomicQualLoc(ATL, D.getTypeObject(i));
6674 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
6675 }
6676
6677 bool HasDesugaredTypeLoc = true;
6678 while (HasDesugaredTypeLoc) {
6679 switch (CurrTL.getTypeLocClass()) {
6680 case TypeLoc::MacroQualified: {
6681 auto TL = CurrTL.castAs<MacroQualifiedTypeLoc>();
6682 TL.setExpansionLoc(
6683 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
6684 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6685 break;
6686 }
6687
6688 case TypeLoc::Attributed: {
6689 auto TL = CurrTL.castAs<AttributedTypeLoc>();
6690 fillAttributedTypeLoc(TL, State);
6691 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6692 break;
6693 }
6694
6695 case TypeLoc::Adjusted:
6696 case TypeLoc::BTFTagAttributed: {
6697 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6698 break;
6699 }
6700
6701 case TypeLoc::DependentAddressSpace: {
6702 auto TL = CurrTL.castAs<DependentAddressSpaceTypeLoc>();
6703 fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
6704 CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc();
6705 break;
6706 }
6707
6708 default:
6709 HasDesugaredTypeLoc = false;
6710 break;
6711 }
6712 }
6713
6714 DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL);
6715 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6716 }
6717
6718 // If we have different source information for the return type, use
6719 // that. This really only applies to C++ conversion functions.
6720 if (ReturnTypeInfo) {
6721 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
6722 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
6723 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
6724 } else {
6725 TypeSpecLocFiller(S, S.Context, State, D.getDeclSpec()).Visit(CurrTL);
6726 }
6727
6728 return TInfo;
6729 }
6730
6731 /// Create a LocInfoType to hold the given QualType and TypeSourceInfo.
CreateParsedType(QualType T,TypeSourceInfo * TInfo)6732 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
6733 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
6734 // and Sema during declaration parsing. Try deallocating/caching them when
6735 // it's appropriate, instead of allocating them and keeping them around.
6736 LocInfoType *LocT = (LocInfoType *)BumpAlloc.Allocate(sizeof(LocInfoType),
6737 alignof(LocInfoType));
6738 new (LocT) LocInfoType(T, TInfo);
6739 assert(LocT->getTypeClass() != T->getTypeClass() &&
6740 "LocInfoType's TypeClass conflicts with an existing Type class");
6741 return ParsedType::make(QualType(LocT, 0));
6742 }
6743
getAsStringInternal(std::string & Str,const PrintingPolicy & Policy) const6744 void LocInfoType::getAsStringInternal(std::string &Str,
6745 const PrintingPolicy &Policy) const {
6746 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
6747 " was used directly instead of getting the QualType through"
6748 " GetTypeFromParser");
6749 }
6750
ActOnTypeName(Declarator & D)6751 TypeResult Sema::ActOnTypeName(Declarator &D) {
6752 // C99 6.7.6: Type names have no identifier. This is already validated by
6753 // the parser.
6754 assert(D.getIdentifier() == nullptr &&
6755 "Type name should have no identifier!");
6756
6757 TypeSourceInfo *TInfo = GetTypeForDeclarator(D);
6758 QualType T = TInfo->getType();
6759 if (D.isInvalidType())
6760 return true;
6761
6762 // Make sure there are no unused decl attributes on the declarator.
6763 // We don't want to do this for ObjC parameters because we're going
6764 // to apply them to the actual parameter declaration.
6765 // Likewise, we don't want to do this for alias declarations, because
6766 // we are actually going to build a declaration from this eventually.
6767 if (D.getContext() != DeclaratorContext::ObjCParameter &&
6768 D.getContext() != DeclaratorContext::AliasDecl &&
6769 D.getContext() != DeclaratorContext::AliasTemplate)
6770 checkUnusedDeclAttributes(D);
6771
6772 if (getLangOpts().CPlusPlus) {
6773 // Check that there are no default arguments (C++ only).
6774 CheckExtraCXXDefaultArguments(D);
6775 }
6776
6777 return CreateParsedType(T, TInfo);
6778 }
6779
ActOnObjCInstanceType(SourceLocation Loc)6780 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
6781 QualType T = Context.getObjCInstanceType();
6782 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
6783 return CreateParsedType(T, TInfo);
6784 }
6785
6786 //===----------------------------------------------------------------------===//
6787 // Type Attribute Processing
6788 //===----------------------------------------------------------------------===//
6789
6790 /// Build an AddressSpace index from a constant expression and diagnose any
6791 /// errors related to invalid address_spaces. Returns true on successfully
6792 /// building an AddressSpace index.
BuildAddressSpaceIndex(Sema & S,LangAS & ASIdx,const Expr * AddrSpace,SourceLocation AttrLoc)6793 static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx,
6794 const Expr *AddrSpace,
6795 SourceLocation AttrLoc) {
6796 if (!AddrSpace->isValueDependent()) {
6797 std::optional<llvm::APSInt> OptAddrSpace =
6798 AddrSpace->getIntegerConstantExpr(S.Context);
6799 if (!OptAddrSpace) {
6800 S.Diag(AttrLoc, diag::err_attribute_argument_type)
6801 << "'address_space'" << AANT_ArgumentIntegerConstant
6802 << AddrSpace->getSourceRange();
6803 return false;
6804 }
6805 llvm::APSInt &addrSpace = *OptAddrSpace;
6806
6807 // Bounds checking.
6808 if (addrSpace.isSigned()) {
6809 if (addrSpace.isNegative()) {
6810 S.Diag(AttrLoc, diag::err_attribute_address_space_negative)
6811 << AddrSpace->getSourceRange();
6812 return false;
6813 }
6814 addrSpace.setIsSigned(false);
6815 }
6816
6817 llvm::APSInt max(addrSpace.getBitWidth());
6818 max =
6819 Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace;
6820
6821 if (addrSpace > max) {
6822 S.Diag(AttrLoc, diag::err_attribute_address_space_too_high)
6823 << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange();
6824 return false;
6825 }
6826
6827 ASIdx =
6828 getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue()));
6829 return true;
6830 }
6831
6832 // Default value for DependentAddressSpaceTypes
6833 ASIdx = LangAS::Default;
6834 return true;
6835 }
6836
6837 /// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression
6838 /// is uninstantiated. If instantiated it will apply the appropriate address
6839 /// space to the type. This function allows dependent template variables to be
6840 /// used in conjunction with the address_space attribute
BuildAddressSpaceAttr(QualType & T,LangAS ASIdx,Expr * AddrSpace,SourceLocation AttrLoc)6841 QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
6842 SourceLocation AttrLoc) {
6843 if (!AddrSpace->isValueDependent()) {
6844 if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx,
6845 AttrLoc))
6846 return QualType();
6847
6848 return Context.getAddrSpaceQualType(T, ASIdx);
6849 }
6850
6851 // A check with similar intentions as checking if a type already has an
6852 // address space except for on a dependent types, basically if the
6853 // current type is already a DependentAddressSpaceType then its already
6854 // lined up to have another address space on it and we can't have
6855 // multiple address spaces on the one pointer indirection
6856 if (T->getAs<DependentAddressSpaceType>()) {
6857 Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
6858 return QualType();
6859 }
6860
6861 return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc);
6862 }
6863
BuildAddressSpaceAttr(QualType & T,Expr * AddrSpace,SourceLocation AttrLoc)6864 QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
6865 SourceLocation AttrLoc) {
6866 LangAS ASIdx;
6867 if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc))
6868 return QualType();
6869 return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc);
6870 }
6871
HandleBTFTypeTagAttribute(QualType & Type,const ParsedAttr & Attr,TypeProcessingState & State)6872 static void HandleBTFTypeTagAttribute(QualType &Type, const ParsedAttr &Attr,
6873 TypeProcessingState &State) {
6874 Sema &S = State.getSema();
6875
6876 // Check the number of attribute arguments.
6877 if (Attr.getNumArgs() != 1) {
6878 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
6879 << Attr << 1;
6880 Attr.setInvalid();
6881 return;
6882 }
6883
6884 // Ensure the argument is a string.
6885 auto *StrLiteral = dyn_cast<StringLiteral>(Attr.getArgAsExpr(0));
6886 if (!StrLiteral) {
6887 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
6888 << Attr << AANT_ArgumentString;
6889 Attr.setInvalid();
6890 return;
6891 }
6892
6893 ASTContext &Ctx = S.Context;
6894 StringRef BTFTypeTag = StrLiteral->getString();
6895 Type = State.getBTFTagAttributedType(
6896 ::new (Ctx) BTFTypeTagAttr(Ctx, Attr, BTFTypeTag), Type);
6897 }
6898
6899 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
6900 /// specified type. The attribute contains 1 argument, the id of the address
6901 /// space for the type.
HandleAddressSpaceTypeAttribute(QualType & Type,const ParsedAttr & Attr,TypeProcessingState & State)6902 static void HandleAddressSpaceTypeAttribute(QualType &Type,
6903 const ParsedAttr &Attr,
6904 TypeProcessingState &State) {
6905 Sema &S = State.getSema();
6906
6907 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
6908 // qualified by an address-space qualifier."
6909 if (Type->isFunctionType()) {
6910 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
6911 Attr.setInvalid();
6912 return;
6913 }
6914
6915 LangAS ASIdx;
6916 if (Attr.getKind() == ParsedAttr::AT_AddressSpace) {
6917
6918 // Check the attribute arguments.
6919 if (Attr.getNumArgs() != 1) {
6920 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
6921 << 1;
6922 Attr.setInvalid();
6923 return;
6924 }
6925
6926 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
6927 LangAS ASIdx;
6928 if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) {
6929 Attr.setInvalid();
6930 return;
6931 }
6932
6933 ASTContext &Ctx = S.Context;
6934 auto *ASAttr =
6935 ::new (Ctx) AddressSpaceAttr(Ctx, Attr, static_cast<unsigned>(ASIdx));
6936
6937 // If the expression is not value dependent (not templated), then we can
6938 // apply the address space qualifiers just to the equivalent type.
6939 // Otherwise, we make an AttributedType with the modified and equivalent
6940 // type the same, and wrap it in a DependentAddressSpaceType. When this
6941 // dependent type is resolved, the qualifier is added to the equivalent type
6942 // later.
6943 QualType T;
6944 if (!ASArgExpr->isValueDependent()) {
6945 QualType EquivType =
6946 S.BuildAddressSpaceAttr(Type, ASIdx, ASArgExpr, Attr.getLoc());
6947 if (EquivType.isNull()) {
6948 Attr.setInvalid();
6949 return;
6950 }
6951 T = State.getAttributedType(ASAttr, Type, EquivType);
6952 } else {
6953 T = State.getAttributedType(ASAttr, Type, Type);
6954 T = S.BuildAddressSpaceAttr(T, ASIdx, ASArgExpr, Attr.getLoc());
6955 }
6956
6957 if (!T.isNull())
6958 Type = T;
6959 else
6960 Attr.setInvalid();
6961 } else {
6962 // The keyword-based type attributes imply which address space to use.
6963 ASIdx = S.getLangOpts().SYCLIsDevice ? Attr.asSYCLLangAS()
6964 : Attr.asOpenCLLangAS();
6965 if (S.getLangOpts().HLSL)
6966 ASIdx = Attr.asHLSLLangAS();
6967
6968 if (ASIdx == LangAS::Default)
6969 llvm_unreachable("Invalid address space");
6970
6971 if (DiagnoseMultipleAddrSpaceAttributes(S, Type.getAddressSpace(), ASIdx,
6972 Attr.getLoc())) {
6973 Attr.setInvalid();
6974 return;
6975 }
6976
6977 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
6978 }
6979 }
6980
6981 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
6982 /// attribute on the specified type.
6983 ///
6984 /// Returns 'true' if the attribute was handled.
handleObjCOwnershipTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)6985 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
6986 ParsedAttr &attr, QualType &type) {
6987 bool NonObjCPointer = false;
6988
6989 if (!type->isDependentType() && !type->isUndeducedType()) {
6990 if (const PointerType *ptr = type->getAs<PointerType>()) {
6991 QualType pointee = ptr->getPointeeType();
6992 if (pointee->isObjCRetainableType() || pointee->isPointerType())
6993 return false;
6994 // It is important not to lose the source info that there was an attribute
6995 // applied to non-objc pointer. We will create an attributed type but
6996 // its type will be the same as the original type.
6997 NonObjCPointer = true;
6998 } else if (!type->isObjCRetainableType()) {
6999 return false;
7000 }
7001
7002 // Don't accept an ownership attribute in the declspec if it would
7003 // just be the return type of a block pointer.
7004 if (state.isProcessingDeclSpec()) {
7005 Declarator &D = state.getDeclarator();
7006 if (maybeMovePastReturnType(D, D.getNumTypeObjects(),
7007 /*onlyBlockPointers=*/true))
7008 return false;
7009 }
7010 }
7011
7012 Sema &S = state.getSema();
7013 SourceLocation AttrLoc = attr.getLoc();
7014 if (AttrLoc.isMacroID())
7015 AttrLoc =
7016 S.getSourceManager().getImmediateExpansionRange(AttrLoc).getBegin();
7017
7018 if (!attr.isArgIdent(0)) {
7019 S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr
7020 << AANT_ArgumentString;
7021 attr.setInvalid();
7022 return true;
7023 }
7024
7025 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
7026 Qualifiers::ObjCLifetime lifetime;
7027 if (II->isStr("none"))
7028 lifetime = Qualifiers::OCL_ExplicitNone;
7029 else if (II->isStr("strong"))
7030 lifetime = Qualifiers::OCL_Strong;
7031 else if (II->isStr("weak"))
7032 lifetime = Qualifiers::OCL_Weak;
7033 else if (II->isStr("autoreleasing"))
7034 lifetime = Qualifiers::OCL_Autoreleasing;
7035 else {
7036 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr << II;
7037 attr.setInvalid();
7038 return true;
7039 }
7040
7041 // Just ignore lifetime attributes other than __weak and __unsafe_unretained
7042 // outside of ARC mode.
7043 if (!S.getLangOpts().ObjCAutoRefCount &&
7044 lifetime != Qualifiers::OCL_Weak &&
7045 lifetime != Qualifiers::OCL_ExplicitNone) {
7046 return true;
7047 }
7048
7049 SplitQualType underlyingType = type.split();
7050
7051 // Check for redundant/conflicting ownership qualifiers.
7052 if (Qualifiers::ObjCLifetime previousLifetime
7053 = type.getQualifiers().getObjCLifetime()) {
7054 // If it's written directly, that's an error.
7055 if (S.Context.hasDirectOwnershipQualifier(type)) {
7056 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
7057 << type;
7058 return true;
7059 }
7060
7061 // Otherwise, if the qualifiers actually conflict, pull sugar off
7062 // and remove the ObjCLifetime qualifiers.
7063 if (previousLifetime != lifetime) {
7064 // It's possible to have multiple local ObjCLifetime qualifiers. We
7065 // can't stop after we reach a type that is directly qualified.
7066 const Type *prevTy = nullptr;
7067 while (!prevTy || prevTy != underlyingType.Ty) {
7068 prevTy = underlyingType.Ty;
7069 underlyingType = underlyingType.getSingleStepDesugaredType();
7070 }
7071 underlyingType.Quals.removeObjCLifetime();
7072 }
7073 }
7074
7075 underlyingType.Quals.addObjCLifetime(lifetime);
7076
7077 if (NonObjCPointer) {
7078 StringRef name = attr.getAttrName()->getName();
7079 switch (lifetime) {
7080 case Qualifiers::OCL_None:
7081 case Qualifiers::OCL_ExplicitNone:
7082 break;
7083 case Qualifiers::OCL_Strong: name = "__strong"; break;
7084 case Qualifiers::OCL_Weak: name = "__weak"; break;
7085 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
7086 }
7087 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
7088 << TDS_ObjCObjOrBlock << type;
7089 }
7090
7091 // Don't actually add the __unsafe_unretained qualifier in non-ARC files,
7092 // because having both 'T' and '__unsafe_unretained T' exist in the type
7093 // system causes unfortunate widespread consistency problems. (For example,
7094 // they're not considered compatible types, and we mangle them identicially
7095 // as template arguments.) These problems are all individually fixable,
7096 // but it's easier to just not add the qualifier and instead sniff it out
7097 // in specific places using isObjCInertUnsafeUnretainedType().
7098 //
7099 // Doing this does means we miss some trivial consistency checks that
7100 // would've triggered in ARC, but that's better than trying to solve all
7101 // the coexistence problems with __unsafe_unretained.
7102 if (!S.getLangOpts().ObjCAutoRefCount &&
7103 lifetime == Qualifiers::OCL_ExplicitNone) {
7104 type = state.getAttributedType(
7105 createSimpleAttr<ObjCInertUnsafeUnretainedAttr>(S.Context, attr),
7106 type, type);
7107 return true;
7108 }
7109
7110 QualType origType = type;
7111 if (!NonObjCPointer)
7112 type = S.Context.getQualifiedType(underlyingType);
7113
7114 // If we have a valid source location for the attribute, use an
7115 // AttributedType instead.
7116 if (AttrLoc.isValid()) {
7117 type = state.getAttributedType(::new (S.Context)
7118 ObjCOwnershipAttr(S.Context, attr, II),
7119 origType, type);
7120 }
7121
7122 auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
7123 unsigned diagnostic, QualType type) {
7124 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
7125 S.DelayedDiagnostics.add(
7126 sema::DelayedDiagnostic::makeForbiddenType(
7127 S.getSourceManager().getExpansionLoc(loc),
7128 diagnostic, type, /*ignored*/ 0));
7129 } else {
7130 S.Diag(loc, diagnostic);
7131 }
7132 };
7133
7134 // Sometimes, __weak isn't allowed.
7135 if (lifetime == Qualifiers::OCL_Weak &&
7136 !S.getLangOpts().ObjCWeak && !NonObjCPointer) {
7137
7138 // Use a specialized diagnostic if the runtime just doesn't support them.
7139 unsigned diagnostic =
7140 (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled
7141 : diag::err_arc_weak_no_runtime);
7142
7143 // In any case, delay the diagnostic until we know what we're parsing.
7144 diagnoseOrDelay(S, AttrLoc, diagnostic, type);
7145
7146 attr.setInvalid();
7147 return true;
7148 }
7149
7150 // Forbid __weak for class objects marked as
7151 // objc_arc_weak_reference_unavailable
7152 if (lifetime == Qualifiers::OCL_Weak) {
7153 if (const ObjCObjectPointerType *ObjT =
7154 type->getAs<ObjCObjectPointerType>()) {
7155 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
7156 if (Class->isArcWeakrefUnavailable()) {
7157 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
7158 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
7159 diag::note_class_declared);
7160 }
7161 }
7162 }
7163 }
7164
7165 return true;
7166 }
7167
7168 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
7169 /// attribute on the specified type. Returns true to indicate that
7170 /// the attribute was handled, false to indicate that the type does
7171 /// not permit the attribute.
handleObjCGCTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)7172 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
7173 QualType &type) {
7174 Sema &S = state.getSema();
7175
7176 // Delay if this isn't some kind of pointer.
7177 if (!type->isPointerType() &&
7178 !type->isObjCObjectPointerType() &&
7179 !type->isBlockPointerType())
7180 return false;
7181
7182 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
7183 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
7184 attr.setInvalid();
7185 return true;
7186 }
7187
7188 // Check the attribute arguments.
7189 if (!attr.isArgIdent(0)) {
7190 S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
7191 << attr << AANT_ArgumentString;
7192 attr.setInvalid();
7193 return true;
7194 }
7195 Qualifiers::GC GCAttr;
7196 if (attr.getNumArgs() > 1) {
7197 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr
7198 << 1;
7199 attr.setInvalid();
7200 return true;
7201 }
7202
7203 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
7204 if (II->isStr("weak"))
7205 GCAttr = Qualifiers::Weak;
7206 else if (II->isStr("strong"))
7207 GCAttr = Qualifiers::Strong;
7208 else {
7209 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
7210 << attr << II;
7211 attr.setInvalid();
7212 return true;
7213 }
7214
7215 QualType origType = type;
7216 type = S.Context.getObjCGCQualType(origType, GCAttr);
7217
7218 // Make an attributed type to preserve the source information.
7219 if (attr.getLoc().isValid())
7220 type = state.getAttributedType(
7221 ::new (S.Context) ObjCGCAttr(S.Context, attr, II), origType, type);
7222
7223 return true;
7224 }
7225
7226 namespace {
7227 /// A helper class to unwrap a type down to a function for the
7228 /// purposes of applying attributes there.
7229 ///
7230 /// Use:
7231 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
7232 /// if (unwrapped.isFunctionType()) {
7233 /// const FunctionType *fn = unwrapped.get();
7234 /// // change fn somehow
7235 /// T = unwrapped.wrap(fn);
7236 /// }
7237 struct FunctionTypeUnwrapper {
7238 enum WrapKind {
7239 Desugar,
7240 Attributed,
7241 Parens,
7242 Array,
7243 Pointer,
7244 BlockPointer,
7245 Reference,
7246 MemberPointer,
7247 MacroQualified,
7248 };
7249
7250 QualType Original;
7251 const FunctionType *Fn;
7252 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
7253
FunctionTypeUnwrapper__anon813a705f1411::FunctionTypeUnwrapper7254 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
7255 while (true) {
7256 const Type *Ty = T.getTypePtr();
7257 if (isa<FunctionType>(Ty)) {
7258 Fn = cast<FunctionType>(Ty);
7259 return;
7260 } else if (isa<ParenType>(Ty)) {
7261 T = cast<ParenType>(Ty)->getInnerType();
7262 Stack.push_back(Parens);
7263 } else if (isa<ConstantArrayType>(Ty) || isa<VariableArrayType>(Ty) ||
7264 isa<IncompleteArrayType>(Ty)) {
7265 T = cast<ArrayType>(Ty)->getElementType();
7266 Stack.push_back(Array);
7267 } else if (isa<PointerType>(Ty)) {
7268 T = cast<PointerType>(Ty)->getPointeeType();
7269 Stack.push_back(Pointer);
7270 } else if (isa<BlockPointerType>(Ty)) {
7271 T = cast<BlockPointerType>(Ty)->getPointeeType();
7272 Stack.push_back(BlockPointer);
7273 } else if (isa<MemberPointerType>(Ty)) {
7274 T = cast<MemberPointerType>(Ty)->getPointeeType();
7275 Stack.push_back(MemberPointer);
7276 } else if (isa<ReferenceType>(Ty)) {
7277 T = cast<ReferenceType>(Ty)->getPointeeType();
7278 Stack.push_back(Reference);
7279 } else if (isa<AttributedType>(Ty)) {
7280 T = cast<AttributedType>(Ty)->getEquivalentType();
7281 Stack.push_back(Attributed);
7282 } else if (isa<MacroQualifiedType>(Ty)) {
7283 T = cast<MacroQualifiedType>(Ty)->getUnderlyingType();
7284 Stack.push_back(MacroQualified);
7285 } else {
7286 const Type *DTy = Ty->getUnqualifiedDesugaredType();
7287 if (Ty == DTy) {
7288 Fn = nullptr;
7289 return;
7290 }
7291
7292 T = QualType(DTy, 0);
7293 Stack.push_back(Desugar);
7294 }
7295 }
7296 }
7297
isFunctionType__anon813a705f1411::FunctionTypeUnwrapper7298 bool isFunctionType() const { return (Fn != nullptr); }
get__anon813a705f1411::FunctionTypeUnwrapper7299 const FunctionType *get() const { return Fn; }
7300
wrap__anon813a705f1411::FunctionTypeUnwrapper7301 QualType wrap(Sema &S, const FunctionType *New) {
7302 // If T wasn't modified from the unwrapped type, do nothing.
7303 if (New == get()) return Original;
7304
7305 Fn = New;
7306 return wrap(S.Context, Original, 0);
7307 }
7308
7309 private:
wrap__anon813a705f1411::FunctionTypeUnwrapper7310 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
7311 if (I == Stack.size())
7312 return C.getQualifiedType(Fn, Old.getQualifiers());
7313
7314 // Build up the inner type, applying the qualifiers from the old
7315 // type to the new type.
7316 SplitQualType SplitOld = Old.split();
7317
7318 // As a special case, tail-recurse if there are no qualifiers.
7319 if (SplitOld.Quals.empty())
7320 return wrap(C, SplitOld.Ty, I);
7321 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
7322 }
7323
wrap__anon813a705f1411::FunctionTypeUnwrapper7324 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
7325 if (I == Stack.size()) return QualType(Fn, 0);
7326
7327 switch (static_cast<WrapKind>(Stack[I++])) {
7328 case Desugar:
7329 // This is the point at which we potentially lose source
7330 // information.
7331 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
7332
7333 case Attributed:
7334 return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I);
7335
7336 case Parens: {
7337 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
7338 return C.getParenType(New);
7339 }
7340
7341 case MacroQualified:
7342 return wrap(C, cast<MacroQualifiedType>(Old)->getUnderlyingType(), I);
7343
7344 case Array: {
7345 if (const auto *CAT = dyn_cast<ConstantArrayType>(Old)) {
7346 QualType New = wrap(C, CAT->getElementType(), I);
7347 return C.getConstantArrayType(New, CAT->getSize(), CAT->getSizeExpr(),
7348 CAT->getSizeModifier(),
7349 CAT->getIndexTypeCVRQualifiers());
7350 }
7351
7352 if (const auto *VAT = dyn_cast<VariableArrayType>(Old)) {
7353 QualType New = wrap(C, VAT->getElementType(), I);
7354 return C.getVariableArrayType(
7355 New, VAT->getSizeExpr(), VAT->getSizeModifier(),
7356 VAT->getIndexTypeCVRQualifiers(), VAT->getBracketsRange());
7357 }
7358
7359 const auto *IAT = cast<IncompleteArrayType>(Old);
7360 QualType New = wrap(C, IAT->getElementType(), I);
7361 return C.getIncompleteArrayType(New, IAT->getSizeModifier(),
7362 IAT->getIndexTypeCVRQualifiers());
7363 }
7364
7365 case Pointer: {
7366 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
7367 return C.getPointerType(New);
7368 }
7369
7370 case BlockPointer: {
7371 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
7372 return C.getBlockPointerType(New);
7373 }
7374
7375 case MemberPointer: {
7376 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
7377 QualType New = wrap(C, OldMPT->getPointeeType(), I);
7378 return C.getMemberPointerType(New, OldMPT->getClass());
7379 }
7380
7381 case Reference: {
7382 const ReferenceType *OldRef = cast<ReferenceType>(Old);
7383 QualType New = wrap(C, OldRef->getPointeeType(), I);
7384 if (isa<LValueReferenceType>(OldRef))
7385 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
7386 else
7387 return C.getRValueReferenceType(New);
7388 }
7389 }
7390
7391 llvm_unreachable("unknown wrapping kind");
7392 }
7393 };
7394 } // end anonymous namespace
7395
handleMSPointerTypeQualifierAttr(TypeProcessingState & State,ParsedAttr & PAttr,QualType & Type)7396 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
7397 ParsedAttr &PAttr, QualType &Type) {
7398 Sema &S = State.getSema();
7399
7400 Attr *A;
7401 switch (PAttr.getKind()) {
7402 default: llvm_unreachable("Unknown attribute kind");
7403 case ParsedAttr::AT_Ptr32:
7404 A = createSimpleAttr<Ptr32Attr>(S.Context, PAttr);
7405 break;
7406 case ParsedAttr::AT_Ptr64:
7407 A = createSimpleAttr<Ptr64Attr>(S.Context, PAttr);
7408 break;
7409 case ParsedAttr::AT_SPtr:
7410 A = createSimpleAttr<SPtrAttr>(S.Context, PAttr);
7411 break;
7412 case ParsedAttr::AT_UPtr:
7413 A = createSimpleAttr<UPtrAttr>(S.Context, PAttr);
7414 break;
7415 }
7416
7417 std::bitset<attr::LastAttr> Attrs;
7418 QualType Desugared = Type;
7419 for (;;) {
7420 if (const TypedefType *TT = dyn_cast<TypedefType>(Desugared)) {
7421 Desugared = TT->desugar();
7422 continue;
7423 } else if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Desugared)) {
7424 Desugared = ET->desugar();
7425 continue;
7426 }
7427 const AttributedType *AT = dyn_cast<AttributedType>(Desugared);
7428 if (!AT)
7429 break;
7430 Attrs[AT->getAttrKind()] = true;
7431 Desugared = AT->getModifiedType();
7432 }
7433
7434 // You cannot specify duplicate type attributes, so if the attribute has
7435 // already been applied, flag it.
7436 attr::Kind NewAttrKind = A->getKind();
7437 if (Attrs[NewAttrKind]) {
7438 S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
7439 return true;
7440 }
7441 Attrs[NewAttrKind] = true;
7442
7443 // You cannot have both __sptr and __uptr on the same type, nor can you
7444 // have __ptr32 and __ptr64.
7445 if (Attrs[attr::Ptr32] && Attrs[attr::Ptr64]) {
7446 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7447 << "'__ptr32'"
7448 << "'__ptr64'" << /*isRegularKeyword=*/0;
7449 return true;
7450 } else if (Attrs[attr::SPtr] && Attrs[attr::UPtr]) {
7451 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7452 << "'__sptr'"
7453 << "'__uptr'" << /*isRegularKeyword=*/0;
7454 return true;
7455 }
7456
7457 // Check the raw (i.e., desugared) Canonical type to see if it
7458 // is a pointer type.
7459 if (!isa<PointerType>(Desugared)) {
7460 // Pointer type qualifiers can only operate on pointer types, but not
7461 // pointer-to-member types.
7462 if (Type->isMemberPointerType())
7463 S.Diag(PAttr.getLoc(), diag::err_attribute_no_member_pointers) << PAttr;
7464 else
7465 S.Diag(PAttr.getLoc(), diag::err_attribute_pointers_only) << PAttr << 0;
7466 return true;
7467 }
7468
7469 // Add address space to type based on its attributes.
7470 LangAS ASIdx = LangAS::Default;
7471 uint64_t PtrWidth =
7472 S.Context.getTargetInfo().getPointerWidth(LangAS::Default);
7473 if (PtrWidth == 32) {
7474 if (Attrs[attr::Ptr64])
7475 ASIdx = LangAS::ptr64;
7476 else if (Attrs[attr::UPtr])
7477 ASIdx = LangAS::ptr32_uptr;
7478 } else if (PtrWidth == 64 && Attrs[attr::Ptr32]) {
7479 if (Attrs[attr::UPtr])
7480 ASIdx = LangAS::ptr32_uptr;
7481 else
7482 ASIdx = LangAS::ptr32_sptr;
7483 }
7484
7485 QualType Pointee = Type->getPointeeType();
7486 if (ASIdx != LangAS::Default)
7487 Pointee = S.Context.getAddrSpaceQualType(
7488 S.Context.removeAddrSpaceQualType(Pointee), ASIdx);
7489 Type = State.getAttributedType(A, Type, S.Context.getPointerType(Pointee));
7490 return false;
7491 }
7492
HandleWebAssemblyFuncrefAttr(TypeProcessingState & State,QualType & QT,ParsedAttr & PAttr)7493 static bool HandleWebAssemblyFuncrefAttr(TypeProcessingState &State,
7494 QualType &QT, ParsedAttr &PAttr) {
7495 assert(PAttr.getKind() == ParsedAttr::AT_WebAssemblyFuncref);
7496
7497 Sema &S = State.getSema();
7498 Attr *A = createSimpleAttr<WebAssemblyFuncrefAttr>(S.Context, PAttr);
7499
7500 std::bitset<attr::LastAttr> Attrs;
7501 attr::Kind NewAttrKind = A->getKind();
7502 const auto *AT = dyn_cast<AttributedType>(QT);
7503 while (AT) {
7504 Attrs[AT->getAttrKind()] = true;
7505 AT = dyn_cast<AttributedType>(AT->getModifiedType());
7506 }
7507
7508 // You cannot specify duplicate type attributes, so if the attribute has
7509 // already been applied, flag it.
7510 if (Attrs[NewAttrKind]) {
7511 S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
7512 return true;
7513 }
7514
7515 // Add address space to type based on its attributes.
7516 LangAS ASIdx = LangAS::wasm_funcref;
7517 QualType Pointee = QT->getPointeeType();
7518 Pointee = S.Context.getAddrSpaceQualType(
7519 S.Context.removeAddrSpaceQualType(Pointee), ASIdx);
7520 QT = State.getAttributedType(A, QT, S.Context.getPointerType(Pointee));
7521 return false;
7522 }
7523
7524 /// Rebuild an attributed type without the nullability attribute on it.
rebuildAttributedTypeWithoutNullability(ASTContext & Ctx,QualType Type)7525 static QualType rebuildAttributedTypeWithoutNullability(ASTContext &Ctx,
7526 QualType Type) {
7527 auto Attributed = dyn_cast<AttributedType>(Type.getTypePtr());
7528 if (!Attributed)
7529 return Type;
7530
7531 // Skip the nullability attribute; we're done.
7532 if (Attributed->getImmediateNullability())
7533 return Attributed->getModifiedType();
7534
7535 // Build the modified type.
7536 QualType Modified = rebuildAttributedTypeWithoutNullability(
7537 Ctx, Attributed->getModifiedType());
7538 assert(Modified.getTypePtr() != Attributed->getModifiedType().getTypePtr());
7539 return Ctx.getAttributedType(Attributed->getAttrKind(), Modified,
7540 Attributed->getEquivalentType());
7541 }
7542
7543 /// Map a nullability attribute kind to a nullability kind.
mapNullabilityAttrKind(ParsedAttr::Kind kind)7544 static NullabilityKind mapNullabilityAttrKind(ParsedAttr::Kind kind) {
7545 switch (kind) {
7546 case ParsedAttr::AT_TypeNonNull:
7547 return NullabilityKind::NonNull;
7548
7549 case ParsedAttr::AT_TypeNullable:
7550 return NullabilityKind::Nullable;
7551
7552 case ParsedAttr::AT_TypeNullableResult:
7553 return NullabilityKind::NullableResult;
7554
7555 case ParsedAttr::AT_TypeNullUnspecified:
7556 return NullabilityKind::Unspecified;
7557
7558 default:
7559 llvm_unreachable("not a nullability attribute kind");
7560 }
7561 }
7562
CheckNullabilityTypeSpecifier(Sema & S,TypeProcessingState * State,ParsedAttr * PAttr,QualType & QT,NullabilityKind Nullability,SourceLocation NullabilityLoc,bool IsContextSensitive,bool AllowOnArrayType,bool OverrideExisting)7563 static bool CheckNullabilityTypeSpecifier(
7564 Sema &S, TypeProcessingState *State, ParsedAttr *PAttr, QualType &QT,
7565 NullabilityKind Nullability, SourceLocation NullabilityLoc,
7566 bool IsContextSensitive, bool AllowOnArrayType, bool OverrideExisting) {
7567 bool Implicit = (State == nullptr);
7568 if (!Implicit)
7569 recordNullabilitySeen(S, NullabilityLoc);
7570
7571 // Check for existing nullability attributes on the type.
7572 QualType Desugared = QT;
7573 while (auto *Attributed = dyn_cast<AttributedType>(Desugared.getTypePtr())) {
7574 // Check whether there is already a null
7575 if (auto ExistingNullability = Attributed->getImmediateNullability()) {
7576 // Duplicated nullability.
7577 if (Nullability == *ExistingNullability) {
7578 if (Implicit)
7579 break;
7580
7581 S.Diag(NullabilityLoc, diag::warn_nullability_duplicate)
7582 << DiagNullabilityKind(Nullability, IsContextSensitive)
7583 << FixItHint::CreateRemoval(NullabilityLoc);
7584
7585 break;
7586 }
7587
7588 if (!OverrideExisting) {
7589 // Conflicting nullability.
7590 S.Diag(NullabilityLoc, diag::err_nullability_conflicting)
7591 << DiagNullabilityKind(Nullability, IsContextSensitive)
7592 << DiagNullabilityKind(*ExistingNullability, false);
7593 return true;
7594 }
7595
7596 // Rebuild the attributed type, dropping the existing nullability.
7597 QT = rebuildAttributedTypeWithoutNullability(S.Context, QT);
7598 }
7599
7600 Desugared = Attributed->getModifiedType();
7601 }
7602
7603 // If there is already a different nullability specifier, complain.
7604 // This (unlike the code above) looks through typedefs that might
7605 // have nullability specifiers on them, which means we cannot
7606 // provide a useful Fix-It.
7607 if (auto ExistingNullability = Desugared->getNullability()) {
7608 if (Nullability != *ExistingNullability && !Implicit) {
7609 S.Diag(NullabilityLoc, diag::err_nullability_conflicting)
7610 << DiagNullabilityKind(Nullability, IsContextSensitive)
7611 << DiagNullabilityKind(*ExistingNullability, false);
7612
7613 // Try to find the typedef with the existing nullability specifier.
7614 if (auto TT = Desugared->getAs<TypedefType>()) {
7615 TypedefNameDecl *typedefDecl = TT->getDecl();
7616 QualType underlyingType = typedefDecl->getUnderlyingType();
7617 if (auto typedefNullability =
7618 AttributedType::stripOuterNullability(underlyingType)) {
7619 if (*typedefNullability == *ExistingNullability) {
7620 S.Diag(typedefDecl->getLocation(), diag::note_nullability_here)
7621 << DiagNullabilityKind(*ExistingNullability, false);
7622 }
7623 }
7624 }
7625
7626 return true;
7627 }
7628 }
7629
7630 // If this definitely isn't a pointer type, reject the specifier.
7631 if (!Desugared->canHaveNullability() &&
7632 !(AllowOnArrayType && Desugared->isArrayType())) {
7633 if (!Implicit)
7634 S.Diag(NullabilityLoc, diag::err_nullability_nonpointer)
7635 << DiagNullabilityKind(Nullability, IsContextSensitive) << QT;
7636
7637 return true;
7638 }
7639
7640 // For the context-sensitive keywords/Objective-C property
7641 // attributes, require that the type be a single-level pointer.
7642 if (IsContextSensitive) {
7643 // Make sure that the pointee isn't itself a pointer type.
7644 const Type *pointeeType = nullptr;
7645 if (Desugared->isArrayType())
7646 pointeeType = Desugared->getArrayElementTypeNoTypeQual();
7647 else if (Desugared->isAnyPointerType())
7648 pointeeType = Desugared->getPointeeType().getTypePtr();
7649
7650 if (pointeeType && (pointeeType->isAnyPointerType() ||
7651 pointeeType->isObjCObjectPointerType() ||
7652 pointeeType->isMemberPointerType())) {
7653 S.Diag(NullabilityLoc, diag::err_nullability_cs_multilevel)
7654 << DiagNullabilityKind(Nullability, true) << QT;
7655 S.Diag(NullabilityLoc, diag::note_nullability_type_specifier)
7656 << DiagNullabilityKind(Nullability, false) << QT
7657 << FixItHint::CreateReplacement(NullabilityLoc,
7658 getNullabilitySpelling(Nullability));
7659 return true;
7660 }
7661 }
7662
7663 // Form the attributed type.
7664 if (State) {
7665 assert(PAttr);
7666 Attr *A = createNullabilityAttr(S.Context, *PAttr, Nullability);
7667 QT = State->getAttributedType(A, QT, QT);
7668 } else {
7669 attr::Kind attrKind = AttributedType::getNullabilityAttrKind(Nullability);
7670 QT = S.Context.getAttributedType(attrKind, QT, QT);
7671 }
7672 return false;
7673 }
7674
CheckNullabilityTypeSpecifier(TypeProcessingState & State,QualType & Type,ParsedAttr & Attr,bool AllowOnArrayType)7675 static bool CheckNullabilityTypeSpecifier(TypeProcessingState &State,
7676 QualType &Type, ParsedAttr &Attr,
7677 bool AllowOnArrayType) {
7678 NullabilityKind Nullability = mapNullabilityAttrKind(Attr.getKind());
7679 SourceLocation NullabilityLoc = Attr.getLoc();
7680 bool IsContextSensitive = Attr.isContextSensitiveKeywordAttribute();
7681
7682 return CheckNullabilityTypeSpecifier(State.getSema(), &State, &Attr, Type,
7683 Nullability, NullabilityLoc,
7684 IsContextSensitive, AllowOnArrayType,
7685 /*overrideExisting*/ false);
7686 }
7687
CheckImplicitNullabilityTypeSpecifier(QualType & Type,NullabilityKind Nullability,SourceLocation DiagLoc,bool AllowArrayTypes,bool OverrideExisting)7688 bool Sema::CheckImplicitNullabilityTypeSpecifier(QualType &Type,
7689 NullabilityKind Nullability,
7690 SourceLocation DiagLoc,
7691 bool AllowArrayTypes,
7692 bool OverrideExisting) {
7693 return CheckNullabilityTypeSpecifier(
7694 *this, nullptr, nullptr, Type, Nullability, DiagLoc,
7695 /*isContextSensitive*/ false, AllowArrayTypes, OverrideExisting);
7696 }
7697
7698 /// Check the application of the Objective-C '__kindof' qualifier to
7699 /// the given type.
checkObjCKindOfType(TypeProcessingState & state,QualType & type,ParsedAttr & attr)7700 static bool checkObjCKindOfType(TypeProcessingState &state, QualType &type,
7701 ParsedAttr &attr) {
7702 Sema &S = state.getSema();
7703
7704 if (isa<ObjCTypeParamType>(type)) {
7705 // Build the attributed type to record where __kindof occurred.
7706 type = state.getAttributedType(
7707 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, type);
7708 return false;
7709 }
7710
7711 // Find out if it's an Objective-C object or object pointer type;
7712 const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>();
7713 const ObjCObjectType *objType = ptrType ? ptrType->getObjectType()
7714 : type->getAs<ObjCObjectType>();
7715
7716 // If not, we can't apply __kindof.
7717 if (!objType) {
7718 // FIXME: Handle dependent types that aren't yet object types.
7719 S.Diag(attr.getLoc(), diag::err_objc_kindof_nonobject)
7720 << type;
7721 return true;
7722 }
7723
7724 // Rebuild the "equivalent" type, which pushes __kindof down into
7725 // the object type.
7726 // There is no need to apply kindof on an unqualified id type.
7727 QualType equivType = S.Context.getObjCObjectType(
7728 objType->getBaseType(), objType->getTypeArgsAsWritten(),
7729 objType->getProtocols(),
7730 /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true);
7731
7732 // If we started with an object pointer type, rebuild it.
7733 if (ptrType) {
7734 equivType = S.Context.getObjCObjectPointerType(equivType);
7735 if (auto nullability = type->getNullability()) {
7736 // We create a nullability attribute from the __kindof attribute.
7737 // Make sure that will make sense.
7738 assert(attr.getAttributeSpellingListIndex() == 0 &&
7739 "multiple spellings for __kindof?");
7740 Attr *A = createNullabilityAttr(S.Context, attr, *nullability);
7741 A->setImplicit(true);
7742 equivType = state.getAttributedType(A, equivType, equivType);
7743 }
7744 }
7745
7746 // Build the attributed type to record where __kindof occurred.
7747 type = state.getAttributedType(
7748 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, equivType);
7749 return false;
7750 }
7751
7752 /// Distribute a nullability type attribute that cannot be applied to
7753 /// the type specifier to a pointer, block pointer, or member pointer
7754 /// declarator, complaining if necessary.
7755 ///
7756 /// \returns true if the nullability annotation was distributed, false
7757 /// otherwise.
distributeNullabilityTypeAttr(TypeProcessingState & state,QualType type,ParsedAttr & attr)7758 static bool distributeNullabilityTypeAttr(TypeProcessingState &state,
7759 QualType type, ParsedAttr &attr) {
7760 Declarator &declarator = state.getDeclarator();
7761
7762 /// Attempt to move the attribute to the specified chunk.
7763 auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool {
7764 // If there is already a nullability attribute there, don't add
7765 // one.
7766 if (hasNullabilityAttr(chunk.getAttrs()))
7767 return false;
7768
7769 // Complain about the nullability qualifier being in the wrong
7770 // place.
7771 enum {
7772 PK_Pointer,
7773 PK_BlockPointer,
7774 PK_MemberPointer,
7775 PK_FunctionPointer,
7776 PK_MemberFunctionPointer,
7777 } pointerKind
7778 = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer
7779 : PK_Pointer)
7780 : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer
7781 : inFunction? PK_MemberFunctionPointer : PK_MemberPointer;
7782
7783 auto diag = state.getSema().Diag(attr.getLoc(),
7784 diag::warn_nullability_declspec)
7785 << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()),
7786 attr.isContextSensitiveKeywordAttribute())
7787 << type
7788 << static_cast<unsigned>(pointerKind);
7789
7790 // FIXME: MemberPointer chunks don't carry the location of the *.
7791 if (chunk.Kind != DeclaratorChunk::MemberPointer) {
7792 diag << FixItHint::CreateRemoval(attr.getLoc())
7793 << FixItHint::CreateInsertion(
7794 state.getSema().getPreprocessor().getLocForEndOfToken(
7795 chunk.Loc),
7796 " " + attr.getAttrName()->getName().str() + " ");
7797 }
7798
7799 moveAttrFromListToList(attr, state.getCurrentAttributes(),
7800 chunk.getAttrs());
7801 return true;
7802 };
7803
7804 // Move it to the outermost pointer, member pointer, or block
7805 // pointer declarator.
7806 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
7807 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
7808 switch (chunk.Kind) {
7809 case DeclaratorChunk::Pointer:
7810 case DeclaratorChunk::BlockPointer:
7811 case DeclaratorChunk::MemberPointer:
7812 return moveToChunk(chunk, false);
7813
7814 case DeclaratorChunk::Paren:
7815 case DeclaratorChunk::Array:
7816 continue;
7817
7818 case DeclaratorChunk::Function:
7819 // Try to move past the return type to a function/block/member
7820 // function pointer.
7821 if (DeclaratorChunk *dest = maybeMovePastReturnType(
7822 declarator, i,
7823 /*onlyBlockPointers=*/false)) {
7824 return moveToChunk(*dest, true);
7825 }
7826
7827 return false;
7828
7829 // Don't walk through these.
7830 case DeclaratorChunk::Reference:
7831 case DeclaratorChunk::Pipe:
7832 return false;
7833 }
7834 }
7835
7836 return false;
7837 }
7838
getCCTypeAttr(ASTContext & Ctx,ParsedAttr & Attr)7839 static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) {
7840 assert(!Attr.isInvalid());
7841 switch (Attr.getKind()) {
7842 default:
7843 llvm_unreachable("not a calling convention attribute");
7844 case ParsedAttr::AT_CDecl:
7845 return createSimpleAttr<CDeclAttr>(Ctx, Attr);
7846 case ParsedAttr::AT_FastCall:
7847 return createSimpleAttr<FastCallAttr>(Ctx, Attr);
7848 case ParsedAttr::AT_StdCall:
7849 return createSimpleAttr<StdCallAttr>(Ctx, Attr);
7850 case ParsedAttr::AT_ThisCall:
7851 return createSimpleAttr<ThisCallAttr>(Ctx, Attr);
7852 case ParsedAttr::AT_RegCall:
7853 return createSimpleAttr<RegCallAttr>(Ctx, Attr);
7854 case ParsedAttr::AT_Pascal:
7855 return createSimpleAttr<PascalAttr>(Ctx, Attr);
7856 case ParsedAttr::AT_SwiftCall:
7857 return createSimpleAttr<SwiftCallAttr>(Ctx, Attr);
7858 case ParsedAttr::AT_SwiftAsyncCall:
7859 return createSimpleAttr<SwiftAsyncCallAttr>(Ctx, Attr);
7860 case ParsedAttr::AT_VectorCall:
7861 return createSimpleAttr<VectorCallAttr>(Ctx, Attr);
7862 case ParsedAttr::AT_AArch64VectorPcs:
7863 return createSimpleAttr<AArch64VectorPcsAttr>(Ctx, Attr);
7864 case ParsedAttr::AT_AArch64SVEPcs:
7865 return createSimpleAttr<AArch64SVEPcsAttr>(Ctx, Attr);
7866 case ParsedAttr::AT_ArmStreaming:
7867 return createSimpleAttr<ArmStreamingAttr>(Ctx, Attr);
7868 case ParsedAttr::AT_AMDGPUKernelCall:
7869 return createSimpleAttr<AMDGPUKernelCallAttr>(Ctx, Attr);
7870 case ParsedAttr::AT_Pcs: {
7871 // The attribute may have had a fixit applied where we treated an
7872 // identifier as a string literal. The contents of the string are valid,
7873 // but the form may not be.
7874 StringRef Str;
7875 if (Attr.isArgExpr(0))
7876 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
7877 else
7878 Str = Attr.getArgAsIdent(0)->Ident->getName();
7879 PcsAttr::PCSType Type;
7880 if (!PcsAttr::ConvertStrToPCSType(Str, Type))
7881 llvm_unreachable("already validated the attribute");
7882 return ::new (Ctx) PcsAttr(Ctx, Attr, Type);
7883 }
7884 case ParsedAttr::AT_IntelOclBicc:
7885 return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr);
7886 case ParsedAttr::AT_MSABI:
7887 return createSimpleAttr<MSABIAttr>(Ctx, Attr);
7888 case ParsedAttr::AT_SysVABI:
7889 return createSimpleAttr<SysVABIAttr>(Ctx, Attr);
7890 case ParsedAttr::AT_PreserveMost:
7891 return createSimpleAttr<PreserveMostAttr>(Ctx, Attr);
7892 case ParsedAttr::AT_PreserveAll:
7893 return createSimpleAttr<PreserveAllAttr>(Ctx, Attr);
7894 case ParsedAttr::AT_M68kRTD:
7895 return createSimpleAttr<M68kRTDAttr>(Ctx, Attr);
7896 }
7897 llvm_unreachable("unexpected attribute kind!");
7898 }
7899
checkMutualExclusion(TypeProcessingState & state,const FunctionProtoType::ExtProtoInfo & EPI,ParsedAttr & Attr,AttributeCommonInfo::Kind OtherKind)7900 static bool checkMutualExclusion(TypeProcessingState &state,
7901 const FunctionProtoType::ExtProtoInfo &EPI,
7902 ParsedAttr &Attr,
7903 AttributeCommonInfo::Kind OtherKind) {
7904 auto OtherAttr = std::find_if(
7905 state.getCurrentAttributes().begin(), state.getCurrentAttributes().end(),
7906 [OtherKind](const ParsedAttr &A) { return A.getKind() == OtherKind; });
7907 if (OtherAttr == state.getCurrentAttributes().end() || OtherAttr->isInvalid())
7908 return false;
7909
7910 Sema &S = state.getSema();
7911 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
7912 << *OtherAttr << Attr
7913 << (OtherAttr->isRegularKeywordAttribute() ||
7914 Attr.isRegularKeywordAttribute());
7915 S.Diag(OtherAttr->getLoc(), diag::note_conflicting_attribute);
7916 Attr.setInvalid();
7917 return true;
7918 }
7919
handleArmStateAttribute(Sema & S,FunctionProtoType::ExtProtoInfo & EPI,ParsedAttr & Attr,FunctionType::ArmStateValue State)7920 static bool handleArmStateAttribute(Sema &S,
7921 FunctionProtoType::ExtProtoInfo &EPI,
7922 ParsedAttr &Attr,
7923 FunctionType::ArmStateValue State) {
7924 if (!Attr.getNumArgs()) {
7925 S.Diag(Attr.getLoc(), diag::err_missing_arm_state) << Attr;
7926 Attr.setInvalid();
7927 return true;
7928 }
7929
7930 for (unsigned I = 0; I < Attr.getNumArgs(); ++I) {
7931 StringRef StateName;
7932 SourceLocation LiteralLoc;
7933 if (!S.checkStringLiteralArgumentAttr(Attr, I, StateName, &LiteralLoc))
7934 return true;
7935
7936 unsigned Shift;
7937 FunctionType::ArmStateValue ExistingState;
7938 if (StateName == "za") {
7939 Shift = FunctionType::SME_ZAShift;
7940 ExistingState = FunctionType::getArmZAState(EPI.AArch64SMEAttributes);
7941 } else if (StateName == "zt0") {
7942 Shift = FunctionType::SME_ZT0Shift;
7943 ExistingState = FunctionType::getArmZT0State(EPI.AArch64SMEAttributes);
7944 } else {
7945 S.Diag(LiteralLoc, diag::err_unknown_arm_state) << StateName;
7946 Attr.setInvalid();
7947 return true;
7948 }
7949
7950 // __arm_in(S), __arm_out(S), __arm_inout(S) and __arm_preserves(S)
7951 // are all mutually exclusive for the same S, so check if there are
7952 // conflicting attributes.
7953 if (ExistingState != FunctionType::ARM_None && ExistingState != State) {
7954 S.Diag(LiteralLoc, diag::err_conflicting_attributes_arm_state)
7955 << StateName;
7956 Attr.setInvalid();
7957 return true;
7958 }
7959
7960 EPI.setArmSMEAttribute(
7961 (FunctionType::AArch64SMETypeAttributes)((State << Shift)));
7962 }
7963 return false;
7964 }
7965
7966 /// Process an individual function attribute. Returns true to
7967 /// indicate that the attribute was handled, false if it wasn't.
handleFunctionTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type,Sema::CUDAFunctionTarget CFT)7968 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
7969 QualType &type,
7970 Sema::CUDAFunctionTarget CFT) {
7971 Sema &S = state.getSema();
7972
7973 FunctionTypeUnwrapper unwrapped(S, type);
7974
7975 if (attr.getKind() == ParsedAttr::AT_NoReturn) {
7976 if (S.CheckAttrNoArgs(attr))
7977 return true;
7978
7979 // Delay if this is not a function type.
7980 if (!unwrapped.isFunctionType())
7981 return false;
7982
7983 // Otherwise we can process right away.
7984 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
7985 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7986 return true;
7987 }
7988
7989 if (attr.getKind() == ParsedAttr::AT_CmseNSCall) {
7990 // Delay if this is not a function type.
7991 if (!unwrapped.isFunctionType())
7992 return false;
7993
7994 // Ignore if we don't have CMSE enabled.
7995 if (!S.getLangOpts().Cmse) {
7996 S.Diag(attr.getLoc(), diag::warn_attribute_ignored) << attr;
7997 attr.setInvalid();
7998 return true;
7999 }
8000
8001 // Otherwise we can process right away.
8002 FunctionType::ExtInfo EI =
8003 unwrapped.get()->getExtInfo().withCmseNSCall(true);
8004 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8005 return true;
8006 }
8007
8008 // ns_returns_retained is not always a type attribute, but if we got
8009 // here, we're treating it as one right now.
8010 if (attr.getKind() == ParsedAttr::AT_NSReturnsRetained) {
8011 if (attr.getNumArgs()) return true;
8012
8013 // Delay if this is not a function type.
8014 if (!unwrapped.isFunctionType())
8015 return false;
8016
8017 // Check whether the return type is reasonable.
8018 if (S.checkNSReturnsRetainedReturnType(attr.getLoc(),
8019 unwrapped.get()->getReturnType()))
8020 return true;
8021
8022 // Only actually change the underlying type in ARC builds.
8023 QualType origType = type;
8024 if (state.getSema().getLangOpts().ObjCAutoRefCount) {
8025 FunctionType::ExtInfo EI
8026 = unwrapped.get()->getExtInfo().withProducesResult(true);
8027 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8028 }
8029 type = state.getAttributedType(
8030 createSimpleAttr<NSReturnsRetainedAttr>(S.Context, attr),
8031 origType, type);
8032 return true;
8033 }
8034
8035 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCallerSavedRegisters) {
8036 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
8037 return true;
8038
8039 // Delay if this is not a function type.
8040 if (!unwrapped.isFunctionType())
8041 return false;
8042
8043 FunctionType::ExtInfo EI =
8044 unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true);
8045 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8046 return true;
8047 }
8048
8049 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCfCheck) {
8050 if (!S.getLangOpts().CFProtectionBranch) {
8051 S.Diag(attr.getLoc(), diag::warn_nocf_check_attribute_ignored);
8052 attr.setInvalid();
8053 return true;
8054 }
8055
8056 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
8057 return true;
8058
8059 // If this is not a function type, warning will be asserted by subject
8060 // check.
8061 if (!unwrapped.isFunctionType())
8062 return true;
8063
8064 FunctionType::ExtInfo EI =
8065 unwrapped.get()->getExtInfo().withNoCfCheck(true);
8066 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8067 return true;
8068 }
8069
8070 if (attr.getKind() == ParsedAttr::AT_Regparm) {
8071 unsigned value;
8072 if (S.CheckRegparmAttr(attr, value))
8073 return true;
8074
8075 // Delay if this is not a function type.
8076 if (!unwrapped.isFunctionType())
8077 return false;
8078
8079 // Diagnose regparm with fastcall.
8080 const FunctionType *fn = unwrapped.get();
8081 CallingConv CC = fn->getCallConv();
8082 if (CC == CC_X86FastCall) {
8083 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
8084 << FunctionType::getNameForCallConv(CC) << "regparm"
8085 << attr.isRegularKeywordAttribute();
8086 attr.setInvalid();
8087 return true;
8088 }
8089
8090 FunctionType::ExtInfo EI =
8091 unwrapped.get()->getExtInfo().withRegParm(value);
8092 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8093 return true;
8094 }
8095
8096 if (attr.getKind() == ParsedAttr::AT_ArmStreaming ||
8097 attr.getKind() == ParsedAttr::AT_ArmStreamingCompatible ||
8098 attr.getKind() == ParsedAttr::AT_ArmPreserves ||
8099 attr.getKind() == ParsedAttr::AT_ArmIn ||
8100 attr.getKind() == ParsedAttr::AT_ArmOut ||
8101 attr.getKind() == ParsedAttr::AT_ArmInOut) {
8102 if (S.CheckAttrTarget(attr))
8103 return true;
8104
8105 if (attr.getKind() == ParsedAttr::AT_ArmStreaming ||
8106 attr.getKind() == ParsedAttr::AT_ArmStreamingCompatible)
8107 if (S.CheckAttrNoArgs(attr))
8108 return true;
8109
8110 if (!unwrapped.isFunctionType())
8111 return false;
8112
8113 const auto *FnTy = unwrapped.get()->getAs<FunctionProtoType>();
8114 if (!FnTy) {
8115 // SME ACLE attributes are not supported on K&R-style unprototyped C
8116 // functions.
8117 S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type) <<
8118 attr << attr.isRegularKeywordAttribute() << ExpectedFunctionWithProtoType;
8119 attr.setInvalid();
8120 return false;
8121 }
8122
8123 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
8124 switch (attr.getKind()) {
8125 case ParsedAttr::AT_ArmStreaming:
8126 if (checkMutualExclusion(state, EPI, attr,
8127 ParsedAttr::AT_ArmStreamingCompatible))
8128 return true;
8129 EPI.setArmSMEAttribute(FunctionType::SME_PStateSMEnabledMask);
8130 break;
8131 case ParsedAttr::AT_ArmStreamingCompatible:
8132 if (checkMutualExclusion(state, EPI, attr, ParsedAttr::AT_ArmStreaming))
8133 return true;
8134 EPI.setArmSMEAttribute(FunctionType::SME_PStateSMCompatibleMask);
8135 break;
8136 case ParsedAttr::AT_ArmPreserves:
8137 if (handleArmStateAttribute(S, EPI, attr, FunctionType::ARM_Preserves))
8138 return true;
8139 break;
8140 case ParsedAttr::AT_ArmIn:
8141 if (handleArmStateAttribute(S, EPI, attr, FunctionType::ARM_In))
8142 return true;
8143 break;
8144 case ParsedAttr::AT_ArmOut:
8145 if (handleArmStateAttribute(S, EPI, attr, FunctionType::ARM_Out))
8146 return true;
8147 break;
8148 case ParsedAttr::AT_ArmInOut:
8149 if (handleArmStateAttribute(S, EPI, attr, FunctionType::ARM_InOut))
8150 return true;
8151 break;
8152 default:
8153 llvm_unreachable("Unsupported attribute");
8154 }
8155
8156 QualType newtype = S.Context.getFunctionType(FnTy->getReturnType(),
8157 FnTy->getParamTypes(), EPI);
8158 type = unwrapped.wrap(S, newtype->getAs<FunctionType>());
8159 return true;
8160 }
8161
8162 if (attr.getKind() == ParsedAttr::AT_NoThrow) {
8163 // Delay if this is not a function type.
8164 if (!unwrapped.isFunctionType())
8165 return false;
8166
8167 if (S.CheckAttrNoArgs(attr)) {
8168 attr.setInvalid();
8169 return true;
8170 }
8171
8172 // Otherwise we can process right away.
8173 auto *Proto = unwrapped.get()->castAs<FunctionProtoType>();
8174
8175 // MSVC ignores nothrow if it is in conflict with an explicit exception
8176 // specification.
8177 if (Proto->hasExceptionSpec()) {
8178 switch (Proto->getExceptionSpecType()) {
8179 case EST_None:
8180 llvm_unreachable("This doesn't have an exception spec!");
8181
8182 case EST_DynamicNone:
8183 case EST_BasicNoexcept:
8184 case EST_NoexceptTrue:
8185 case EST_NoThrow:
8186 // Exception spec doesn't conflict with nothrow, so don't warn.
8187 [[fallthrough]];
8188 case EST_Unparsed:
8189 case EST_Uninstantiated:
8190 case EST_DependentNoexcept:
8191 case EST_Unevaluated:
8192 // We don't have enough information to properly determine if there is a
8193 // conflict, so suppress the warning.
8194 break;
8195 case EST_Dynamic:
8196 case EST_MSAny:
8197 case EST_NoexceptFalse:
8198 S.Diag(attr.getLoc(), diag::warn_nothrow_attribute_ignored);
8199 break;
8200 }
8201 return true;
8202 }
8203
8204 type = unwrapped.wrap(
8205 S, S.Context
8206 .getFunctionTypeWithExceptionSpec(
8207 QualType{Proto, 0},
8208 FunctionProtoType::ExceptionSpecInfo{EST_NoThrow})
8209 ->getAs<FunctionType>());
8210 return true;
8211 }
8212
8213 // Delay if the type didn't work out to a function.
8214 if (!unwrapped.isFunctionType()) return false;
8215
8216 // Otherwise, a calling convention.
8217 CallingConv CC;
8218 if (S.CheckCallingConvAttr(attr, CC, /*FunctionDecl=*/nullptr, CFT))
8219 return true;
8220
8221 const FunctionType *fn = unwrapped.get();
8222 CallingConv CCOld = fn->getCallConv();
8223 Attr *CCAttr = getCCTypeAttr(S.Context, attr);
8224
8225 if (CCOld != CC) {
8226 // Error out on when there's already an attribute on the type
8227 // and the CCs don't match.
8228 if (S.getCallingConvAttributedType(type)) {
8229 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
8230 << FunctionType::getNameForCallConv(CC)
8231 << FunctionType::getNameForCallConv(CCOld)
8232 << attr.isRegularKeywordAttribute();
8233 attr.setInvalid();
8234 return true;
8235 }
8236 }
8237
8238 // Diagnose use of variadic functions with calling conventions that
8239 // don't support them (e.g. because they're callee-cleanup).
8240 // We delay warning about this on unprototyped function declarations
8241 // until after redeclaration checking, just in case we pick up a
8242 // prototype that way. And apparently we also "delay" warning about
8243 // unprototyped function types in general, despite not necessarily having
8244 // much ability to diagnose it later.
8245 if (!supportsVariadicCall(CC)) {
8246 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
8247 if (FnP && FnP->isVariadic()) {
8248 // stdcall and fastcall are ignored with a warning for GCC and MS
8249 // compatibility.
8250 if (CC == CC_X86StdCall || CC == CC_X86FastCall)
8251 return S.Diag(attr.getLoc(), diag::warn_cconv_unsupported)
8252 << FunctionType::getNameForCallConv(CC)
8253 << (int)Sema::CallingConventionIgnoredReason::VariadicFunction;
8254
8255 attr.setInvalid();
8256 return S.Diag(attr.getLoc(), diag::err_cconv_varargs)
8257 << FunctionType::getNameForCallConv(CC);
8258 }
8259 }
8260
8261 // Also diagnose fastcall with regparm.
8262 if (CC == CC_X86FastCall && fn->getHasRegParm()) {
8263 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
8264 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall)
8265 << attr.isRegularKeywordAttribute();
8266 attr.setInvalid();
8267 return true;
8268 }
8269
8270 // Modify the CC from the wrapped function type, wrap it all back, and then
8271 // wrap the whole thing in an AttributedType as written. The modified type
8272 // might have a different CC if we ignored the attribute.
8273 QualType Equivalent;
8274 if (CCOld == CC) {
8275 Equivalent = type;
8276 } else {
8277 auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
8278 Equivalent =
8279 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
8280 }
8281 type = state.getAttributedType(CCAttr, type, Equivalent);
8282 return true;
8283 }
8284
hasExplicitCallingConv(QualType T)8285 bool Sema::hasExplicitCallingConv(QualType T) {
8286 const AttributedType *AT;
8287
8288 // Stop if we'd be stripping off a typedef sugar node to reach the
8289 // AttributedType.
8290 while ((AT = T->getAs<AttributedType>()) &&
8291 AT->getAs<TypedefType>() == T->getAs<TypedefType>()) {
8292 if (AT->isCallingConv())
8293 return true;
8294 T = AT->getModifiedType();
8295 }
8296 return false;
8297 }
8298
adjustMemberFunctionCC(QualType & T,bool HasThisPointer,bool IsCtorOrDtor,SourceLocation Loc)8299 void Sema::adjustMemberFunctionCC(QualType &T, bool HasThisPointer,
8300 bool IsCtorOrDtor, SourceLocation Loc) {
8301 FunctionTypeUnwrapper Unwrapped(*this, T);
8302 const FunctionType *FT = Unwrapped.get();
8303 bool IsVariadic = (isa<FunctionProtoType>(FT) &&
8304 cast<FunctionProtoType>(FT)->isVariadic());
8305 CallingConv CurCC = FT->getCallConv();
8306 CallingConv ToCC =
8307 Context.getDefaultCallingConvention(IsVariadic, HasThisPointer);
8308
8309 if (CurCC == ToCC)
8310 return;
8311
8312 // MS compiler ignores explicit calling convention attributes on structors. We
8313 // should do the same.
8314 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) {
8315 // Issue a warning on ignored calling convention -- except of __stdcall.
8316 // Again, this is what MS compiler does.
8317 if (CurCC != CC_X86StdCall)
8318 Diag(Loc, diag::warn_cconv_unsupported)
8319 << FunctionType::getNameForCallConv(CurCC)
8320 << (int)Sema::CallingConventionIgnoredReason::ConstructorDestructor;
8321 // Default adjustment.
8322 } else {
8323 // Only adjust types with the default convention. For example, on Windows
8324 // we should adjust a __cdecl type to __thiscall for instance methods, and a
8325 // __thiscall type to __cdecl for static methods.
8326 CallingConv DefaultCC =
8327 Context.getDefaultCallingConvention(IsVariadic, !HasThisPointer);
8328
8329 if (CurCC != DefaultCC)
8330 return;
8331
8332 if (hasExplicitCallingConv(T))
8333 return;
8334 }
8335
8336 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
8337 QualType Wrapped = Unwrapped.wrap(*this, FT);
8338 T = Context.getAdjustedType(T, Wrapped);
8339 }
8340
8341 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
8342 /// and float scalars, although arrays, pointers, and function return values are
8343 /// allowed in conjunction with this construct. Aggregates with this attribute
8344 /// are invalid, even if they are of the same size as a corresponding scalar.
8345 /// The raw attribute should contain precisely 1 argument, the vector size for
8346 /// the variable, measured in bytes. If curType and rawAttr are well formed,
8347 /// this routine will return a new vector type.
HandleVectorSizeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8348 static void HandleVectorSizeAttr(QualType &CurType, const ParsedAttr &Attr,
8349 Sema &S) {
8350 // Check the attribute arguments.
8351 if (Attr.getNumArgs() != 1) {
8352 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
8353 << 1;
8354 Attr.setInvalid();
8355 return;
8356 }
8357
8358 Expr *SizeExpr = Attr.getArgAsExpr(0);
8359 QualType T = S.BuildVectorType(CurType, SizeExpr, Attr.getLoc());
8360 if (!T.isNull())
8361 CurType = T;
8362 else
8363 Attr.setInvalid();
8364 }
8365
8366 /// Process the OpenCL-like ext_vector_type attribute when it occurs on
8367 /// a type.
HandleExtVectorTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8368 static void HandleExtVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
8369 Sema &S) {
8370 // check the attribute arguments.
8371 if (Attr.getNumArgs() != 1) {
8372 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
8373 << 1;
8374 return;
8375 }
8376
8377 Expr *SizeExpr = Attr.getArgAsExpr(0);
8378 QualType T = S.BuildExtVectorType(CurType, SizeExpr, Attr.getLoc());
8379 if (!T.isNull())
8380 CurType = T;
8381 }
8382
isPermittedNeonBaseType(QualType & Ty,VectorKind VecKind,Sema & S)8383 static bool isPermittedNeonBaseType(QualType &Ty, VectorKind VecKind, Sema &S) {
8384 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
8385 if (!BTy)
8386 return false;
8387
8388 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
8389
8390 // Signed poly is mathematically wrong, but has been baked into some ABIs by
8391 // now.
8392 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
8393 Triple.getArch() == llvm::Triple::aarch64_32 ||
8394 Triple.getArch() == llvm::Triple::aarch64_be;
8395 if (VecKind == VectorKind::NeonPoly) {
8396 if (IsPolyUnsigned) {
8397 // AArch64 polynomial vectors are unsigned.
8398 return BTy->getKind() == BuiltinType::UChar ||
8399 BTy->getKind() == BuiltinType::UShort ||
8400 BTy->getKind() == BuiltinType::ULong ||
8401 BTy->getKind() == BuiltinType::ULongLong;
8402 } else {
8403 // AArch32 polynomial vectors are signed.
8404 return BTy->getKind() == BuiltinType::SChar ||
8405 BTy->getKind() == BuiltinType::Short ||
8406 BTy->getKind() == BuiltinType::LongLong;
8407 }
8408 }
8409
8410 // Non-polynomial vector types: the usual suspects are allowed, as well as
8411 // float64_t on AArch64.
8412 if ((Triple.isArch64Bit() || Triple.getArch() == llvm::Triple::aarch64_32) &&
8413 BTy->getKind() == BuiltinType::Double)
8414 return true;
8415
8416 return BTy->getKind() == BuiltinType::SChar ||
8417 BTy->getKind() == BuiltinType::UChar ||
8418 BTy->getKind() == BuiltinType::Short ||
8419 BTy->getKind() == BuiltinType::UShort ||
8420 BTy->getKind() == BuiltinType::Int ||
8421 BTy->getKind() == BuiltinType::UInt ||
8422 BTy->getKind() == BuiltinType::Long ||
8423 BTy->getKind() == BuiltinType::ULong ||
8424 BTy->getKind() == BuiltinType::LongLong ||
8425 BTy->getKind() == BuiltinType::ULongLong ||
8426 BTy->getKind() == BuiltinType::Float ||
8427 BTy->getKind() == BuiltinType::Half ||
8428 BTy->getKind() == BuiltinType::BFloat16;
8429 }
8430
verifyValidIntegerConstantExpr(Sema & S,const ParsedAttr & Attr,llvm::APSInt & Result)8431 static bool verifyValidIntegerConstantExpr(Sema &S, const ParsedAttr &Attr,
8432 llvm::APSInt &Result) {
8433 const auto *AttrExpr = Attr.getArgAsExpr(0);
8434 if (!AttrExpr->isTypeDependent()) {
8435 if (std::optional<llvm::APSInt> Res =
8436 AttrExpr->getIntegerConstantExpr(S.Context)) {
8437 Result = *Res;
8438 return true;
8439 }
8440 }
8441 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
8442 << Attr << AANT_ArgumentIntegerConstant << AttrExpr->getSourceRange();
8443 Attr.setInvalid();
8444 return false;
8445 }
8446
8447 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
8448 /// "neon_polyvector_type" attributes are used to create vector types that
8449 /// are mangled according to ARM's ABI. Otherwise, these types are identical
8450 /// to those created with the "vector_size" attribute. Unlike "vector_size"
8451 /// the argument to these Neon attributes is the number of vector elements,
8452 /// not the vector size in bytes. The vector width and element type must
8453 /// match one of the standard Neon vector types.
HandleNeonVectorTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S,VectorKind VecKind)8454 static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
8455 Sema &S, VectorKind VecKind) {
8456 bool IsTargetCUDAAndHostARM = false;
8457 if (S.getLangOpts().CUDAIsDevice) {
8458 const TargetInfo *AuxTI = S.getASTContext().getAuxTargetInfo();
8459 IsTargetCUDAAndHostARM =
8460 AuxTI && (AuxTI->getTriple().isAArch64() || AuxTI->getTriple().isARM());
8461 }
8462
8463 // Target must have NEON (or MVE, whose vectors are similar enough
8464 // not to need a separate attribute)
8465 if (!(S.Context.getTargetInfo().hasFeature("neon") ||
8466 S.Context.getTargetInfo().hasFeature("mve") ||
8467 S.Context.getTargetInfo().hasFeature("sve") ||
8468 S.Context.getTargetInfo().hasFeature("sme") ||
8469 IsTargetCUDAAndHostARM) &&
8470 VecKind == VectorKind::Neon) {
8471 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
8472 << Attr << "'neon', 'mve', 'sve' or 'sme'";
8473 Attr.setInvalid();
8474 return;
8475 }
8476 if (!(S.Context.getTargetInfo().hasFeature("neon") ||
8477 S.Context.getTargetInfo().hasFeature("mve") ||
8478 IsTargetCUDAAndHostARM) &&
8479 VecKind == VectorKind::NeonPoly) {
8480 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
8481 << Attr << "'neon' or 'mve'";
8482 Attr.setInvalid();
8483 return;
8484 }
8485
8486 // Check the attribute arguments.
8487 if (Attr.getNumArgs() != 1) {
8488 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8489 << Attr << 1;
8490 Attr.setInvalid();
8491 return;
8492 }
8493 // The number of elements must be an ICE.
8494 llvm::APSInt numEltsInt(32);
8495 if (!verifyValidIntegerConstantExpr(S, Attr, numEltsInt))
8496 return;
8497
8498 // Only certain element types are supported for Neon vectors.
8499 if (!isPermittedNeonBaseType(CurType, VecKind, S) &&
8500 !IsTargetCUDAAndHostARM) {
8501 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
8502 Attr.setInvalid();
8503 return;
8504 }
8505
8506 // The total size of the vector must be 64 or 128 bits.
8507 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
8508 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
8509 unsigned vecSize = typeSize * numElts;
8510 if (vecSize != 64 && vecSize != 128) {
8511 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
8512 Attr.setInvalid();
8513 return;
8514 }
8515
8516 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
8517 }
8518
8519 /// HandleArmSveVectorBitsTypeAttr - The "arm_sve_vector_bits" attribute is
8520 /// used to create fixed-length versions of sizeless SVE types defined by
8521 /// the ACLE, such as svint32_t and svbool_t.
HandleArmSveVectorBitsTypeAttr(QualType & CurType,ParsedAttr & Attr,Sema & S)8522 static void HandleArmSveVectorBitsTypeAttr(QualType &CurType, ParsedAttr &Attr,
8523 Sema &S) {
8524 // Target must have SVE.
8525 if (!S.Context.getTargetInfo().hasFeature("sve")) {
8526 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr << "'sve'";
8527 Attr.setInvalid();
8528 return;
8529 }
8530
8531 // Attribute is unsupported if '-msve-vector-bits=<bits>' isn't specified, or
8532 // if <bits>+ syntax is used.
8533 if (!S.getLangOpts().VScaleMin ||
8534 S.getLangOpts().VScaleMin != S.getLangOpts().VScaleMax) {
8535 S.Diag(Attr.getLoc(), diag::err_attribute_arm_feature_sve_bits_unsupported)
8536 << Attr;
8537 Attr.setInvalid();
8538 return;
8539 }
8540
8541 // Check the attribute arguments.
8542 if (Attr.getNumArgs() != 1) {
8543 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8544 << Attr << 1;
8545 Attr.setInvalid();
8546 return;
8547 }
8548
8549 // The vector size must be an integer constant expression.
8550 llvm::APSInt SveVectorSizeInBits(32);
8551 if (!verifyValidIntegerConstantExpr(S, Attr, SveVectorSizeInBits))
8552 return;
8553
8554 unsigned VecSize = static_cast<unsigned>(SveVectorSizeInBits.getZExtValue());
8555
8556 // The attribute vector size must match -msve-vector-bits.
8557 if (VecSize != S.getLangOpts().VScaleMin * 128) {
8558 S.Diag(Attr.getLoc(), diag::err_attribute_bad_sve_vector_size)
8559 << VecSize << S.getLangOpts().VScaleMin * 128;
8560 Attr.setInvalid();
8561 return;
8562 }
8563
8564 // Attribute can only be attached to a single SVE vector or predicate type.
8565 if (!CurType->isSveVLSBuiltinType()) {
8566 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_sve_type)
8567 << Attr << CurType;
8568 Attr.setInvalid();
8569 return;
8570 }
8571
8572 const auto *BT = CurType->castAs<BuiltinType>();
8573
8574 QualType EltType = CurType->getSveEltType(S.Context);
8575 unsigned TypeSize = S.Context.getTypeSize(EltType);
8576 VectorKind VecKind = VectorKind::SveFixedLengthData;
8577 if (BT->getKind() == BuiltinType::SveBool) {
8578 // Predicates are represented as i8.
8579 VecSize /= S.Context.getCharWidth() * S.Context.getCharWidth();
8580 VecKind = VectorKind::SveFixedLengthPredicate;
8581 } else
8582 VecSize /= TypeSize;
8583 CurType = S.Context.getVectorType(EltType, VecSize, VecKind);
8584 }
8585
HandleArmMveStrictPolymorphismAttr(TypeProcessingState & State,QualType & CurType,ParsedAttr & Attr)8586 static void HandleArmMveStrictPolymorphismAttr(TypeProcessingState &State,
8587 QualType &CurType,
8588 ParsedAttr &Attr) {
8589 const VectorType *VT = dyn_cast<VectorType>(CurType);
8590 if (!VT || VT->getVectorKind() != VectorKind::Neon) {
8591 State.getSema().Diag(Attr.getLoc(),
8592 diag::err_attribute_arm_mve_polymorphism);
8593 Attr.setInvalid();
8594 return;
8595 }
8596
8597 CurType =
8598 State.getAttributedType(createSimpleAttr<ArmMveStrictPolymorphismAttr>(
8599 State.getSema().Context, Attr),
8600 CurType, CurType);
8601 }
8602
8603 /// HandleRISCVRVVVectorBitsTypeAttr - The "riscv_rvv_vector_bits" attribute is
8604 /// used to create fixed-length versions of sizeless RVV types such as
8605 /// vint8m1_t_t.
HandleRISCVRVVVectorBitsTypeAttr(QualType & CurType,ParsedAttr & Attr,Sema & S)8606 static void HandleRISCVRVVVectorBitsTypeAttr(QualType &CurType,
8607 ParsedAttr &Attr, Sema &S) {
8608 // Target must have vector extension.
8609 if (!S.Context.getTargetInfo().hasFeature("zve32x")) {
8610 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
8611 << Attr << "'zve32x'";
8612 Attr.setInvalid();
8613 return;
8614 }
8615
8616 auto VScale = S.Context.getTargetInfo().getVScaleRange(S.getLangOpts());
8617 if (!VScale || !VScale->first || VScale->first != VScale->second) {
8618 S.Diag(Attr.getLoc(), diag::err_attribute_riscv_rvv_bits_unsupported)
8619 << Attr;
8620 Attr.setInvalid();
8621 return;
8622 }
8623
8624 // Check the attribute arguments.
8625 if (Attr.getNumArgs() != 1) {
8626 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8627 << Attr << 1;
8628 Attr.setInvalid();
8629 return;
8630 }
8631
8632 // The vector size must be an integer constant expression.
8633 llvm::APSInt RVVVectorSizeInBits(32);
8634 if (!verifyValidIntegerConstantExpr(S, Attr, RVVVectorSizeInBits))
8635 return;
8636
8637 // Attribute can only be attached to a single RVV vector type.
8638 if (!CurType->isRVVVLSBuiltinType()) {
8639 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_rvv_type)
8640 << Attr << CurType;
8641 Attr.setInvalid();
8642 return;
8643 }
8644
8645 unsigned VecSize = static_cast<unsigned>(RVVVectorSizeInBits.getZExtValue());
8646
8647 ASTContext::BuiltinVectorTypeInfo Info =
8648 S.Context.getBuiltinVectorTypeInfo(CurType->castAs<BuiltinType>());
8649 unsigned MinElts = Info.EC.getKnownMinValue();
8650
8651 VectorKind VecKind = VectorKind::RVVFixedLengthData;
8652 unsigned ExpectedSize = VScale->first * MinElts;
8653 QualType EltType = CurType->getRVVEltType(S.Context);
8654 unsigned EltSize = S.Context.getTypeSize(EltType);
8655 unsigned NumElts;
8656 if (Info.ElementType == S.Context.BoolTy) {
8657 NumElts = VecSize / S.Context.getCharWidth();
8658 VecKind = VectorKind::RVVFixedLengthMask;
8659 } else {
8660 ExpectedSize *= EltSize;
8661 NumElts = VecSize / EltSize;
8662 }
8663
8664 // The attribute vector size must match -mrvv-vector-bits.
8665 if (ExpectedSize % 8 != 0 || VecSize != ExpectedSize) {
8666 S.Diag(Attr.getLoc(), diag::err_attribute_bad_rvv_vector_size)
8667 << VecSize << ExpectedSize;
8668 Attr.setInvalid();
8669 return;
8670 }
8671
8672 CurType = S.Context.getVectorType(EltType, NumElts, VecKind);
8673 }
8674
8675 /// Handle OpenCL Access Qualifier Attribute.
HandleOpenCLAccessAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8676 static void HandleOpenCLAccessAttr(QualType &CurType, const ParsedAttr &Attr,
8677 Sema &S) {
8678 // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type.
8679 if (!(CurType->isImageType() || CurType->isPipeType())) {
8680 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier);
8681 Attr.setInvalid();
8682 return;
8683 }
8684
8685 if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) {
8686 QualType BaseTy = TypedefTy->desugar();
8687
8688 std::string PrevAccessQual;
8689 if (BaseTy->isPipeType()) {
8690 if (TypedefTy->getDecl()->hasAttr<OpenCLAccessAttr>()) {
8691 OpenCLAccessAttr *Attr =
8692 TypedefTy->getDecl()->getAttr<OpenCLAccessAttr>();
8693 PrevAccessQual = Attr->getSpelling();
8694 } else {
8695 PrevAccessQual = "read_only";
8696 }
8697 } else if (const BuiltinType* ImgType = BaseTy->getAs<BuiltinType>()) {
8698
8699 switch (ImgType->getKind()) {
8700 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
8701 case BuiltinType::Id: \
8702 PrevAccessQual = #Access; \
8703 break;
8704 #include "clang/Basic/OpenCLImageTypes.def"
8705 default:
8706 llvm_unreachable("Unable to find corresponding image type.");
8707 }
8708 } else {
8709 llvm_unreachable("unexpected type");
8710 }
8711 StringRef AttrName = Attr.getAttrName()->getName();
8712 if (PrevAccessQual == AttrName.ltrim("_")) {
8713 // Duplicated qualifiers
8714 S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec)
8715 << AttrName << Attr.getRange();
8716 } else {
8717 // Contradicting qualifiers
8718 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
8719 }
8720
8721 S.Diag(TypedefTy->getDecl()->getBeginLoc(),
8722 diag::note_opencl_typedef_access_qualifier) << PrevAccessQual;
8723 } else if (CurType->isPipeType()) {
8724 if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) {
8725 QualType ElemType = CurType->castAs<PipeType>()->getElementType();
8726 CurType = S.Context.getWritePipeType(ElemType);
8727 }
8728 }
8729 }
8730
8731 /// HandleMatrixTypeAttr - "matrix_type" attribute, like ext_vector_type
HandleMatrixTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8732 static void HandleMatrixTypeAttr(QualType &CurType, const ParsedAttr &Attr,
8733 Sema &S) {
8734 if (!S.getLangOpts().MatrixTypes) {
8735 S.Diag(Attr.getLoc(), diag::err_builtin_matrix_disabled);
8736 return;
8737 }
8738
8739 if (Attr.getNumArgs() != 2) {
8740 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8741 << Attr << 2;
8742 return;
8743 }
8744
8745 Expr *RowsExpr = Attr.getArgAsExpr(0);
8746 Expr *ColsExpr = Attr.getArgAsExpr(1);
8747 QualType T = S.BuildMatrixType(CurType, RowsExpr, ColsExpr, Attr.getLoc());
8748 if (!T.isNull())
8749 CurType = T;
8750 }
8751
HandleAnnotateTypeAttr(TypeProcessingState & State,QualType & CurType,const ParsedAttr & PA)8752 static void HandleAnnotateTypeAttr(TypeProcessingState &State,
8753 QualType &CurType, const ParsedAttr &PA) {
8754 Sema &S = State.getSema();
8755
8756 if (PA.getNumArgs() < 1) {
8757 S.Diag(PA.getLoc(), diag::err_attribute_too_few_arguments) << PA << 1;
8758 return;
8759 }
8760
8761 // Make sure that there is a string literal as the annotation's first
8762 // argument.
8763 StringRef Str;
8764 if (!S.checkStringLiteralArgumentAttr(PA, 0, Str))
8765 return;
8766
8767 llvm::SmallVector<Expr *, 4> Args;
8768 Args.reserve(PA.getNumArgs() - 1);
8769 for (unsigned Idx = 1; Idx < PA.getNumArgs(); Idx++) {
8770 assert(!PA.isArgIdent(Idx));
8771 Args.push_back(PA.getArgAsExpr(Idx));
8772 }
8773 if (!S.ConstantFoldAttrArgs(PA, Args))
8774 return;
8775 auto *AnnotateTypeAttr =
8776 AnnotateTypeAttr::Create(S.Context, Str, Args.data(), Args.size(), PA);
8777 CurType = State.getAttributedType(AnnotateTypeAttr, CurType, CurType);
8778 }
8779
HandleLifetimeBoundAttr(TypeProcessingState & State,QualType & CurType,ParsedAttr & Attr)8780 static void HandleLifetimeBoundAttr(TypeProcessingState &State,
8781 QualType &CurType,
8782 ParsedAttr &Attr) {
8783 if (State.getDeclarator().isDeclarationOfFunction()) {
8784 CurType = State.getAttributedType(
8785 createSimpleAttr<LifetimeBoundAttr>(State.getSema().Context, Attr),
8786 CurType, CurType);
8787 }
8788 }
8789
HandleHLSLParamModifierAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8790 static void HandleHLSLParamModifierAttr(QualType &CurType,
8791 const ParsedAttr &Attr, Sema &S) {
8792 // Don't apply this attribute to template dependent types. It is applied on
8793 // substitution during template instantiation.
8794 if (CurType->isDependentType())
8795 return;
8796 if (Attr.getSemanticSpelling() == HLSLParamModifierAttr::Keyword_inout ||
8797 Attr.getSemanticSpelling() == HLSLParamModifierAttr::Keyword_out)
8798 CurType = S.getASTContext().getLValueReferenceType(CurType);
8799 }
8800
processTypeAttrs(TypeProcessingState & state,QualType & type,TypeAttrLocation TAL,const ParsedAttributesView & attrs,Sema::CUDAFunctionTarget CFT)8801 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
8802 TypeAttrLocation TAL,
8803 const ParsedAttributesView &attrs,
8804 Sema::CUDAFunctionTarget CFT) {
8805
8806 state.setParsedNoDeref(false);
8807 if (attrs.empty())
8808 return;
8809
8810 // Scan through and apply attributes to this type where it makes sense. Some
8811 // attributes (such as __address_space__, __vector_size__, etc) apply to the
8812 // type, but others can be present in the type specifiers even though they
8813 // apply to the decl. Here we apply type attributes and ignore the rest.
8814
8815 // This loop modifies the list pretty frequently, but we still need to make
8816 // sure we visit every element once. Copy the attributes list, and iterate
8817 // over that.
8818 ParsedAttributesView AttrsCopy{attrs};
8819 for (ParsedAttr &attr : AttrsCopy) {
8820
8821 // Skip attributes that were marked to be invalid.
8822 if (attr.isInvalid())
8823 continue;
8824
8825 if (attr.isStandardAttributeSyntax() || attr.isRegularKeywordAttribute()) {
8826 // [[gnu::...]] attributes are treated as declaration attributes, so may
8827 // not appertain to a DeclaratorChunk. If we handle them as type
8828 // attributes, accept them in that position and diagnose the GCC
8829 // incompatibility.
8830 if (attr.isGNUScope()) {
8831 assert(attr.isStandardAttributeSyntax());
8832 bool IsTypeAttr = attr.isTypeAttr();
8833 if (TAL == TAL_DeclChunk) {
8834 state.getSema().Diag(attr.getLoc(),
8835 IsTypeAttr
8836 ? diag::warn_gcc_ignores_type_attr
8837 : diag::warn_cxx11_gnu_attribute_on_type)
8838 << attr;
8839 if (!IsTypeAttr)
8840 continue;
8841 }
8842 } else if (TAL != TAL_DeclSpec && TAL != TAL_DeclChunk &&
8843 !attr.isTypeAttr()) {
8844 // Otherwise, only consider type processing for a C++11 attribute if
8845 // - it has actually been applied to a type (decl-specifier-seq or
8846 // declarator chunk), or
8847 // - it is a type attribute, irrespective of where it was applied (so
8848 // that we can support the legacy behavior of some type attributes
8849 // that can be applied to the declaration name).
8850 continue;
8851 }
8852 }
8853
8854 // If this is an attribute we can handle, do so now,
8855 // otherwise, add it to the FnAttrs list for rechaining.
8856 switch (attr.getKind()) {
8857 default:
8858 // A [[]] attribute on a declarator chunk must appertain to a type.
8859 if ((attr.isStandardAttributeSyntax() ||
8860 attr.isRegularKeywordAttribute()) &&
8861 TAL == TAL_DeclChunk) {
8862 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
8863 << attr << attr.isRegularKeywordAttribute();
8864 attr.setUsedAsTypeAttr();
8865 }
8866 break;
8867
8868 case ParsedAttr::UnknownAttribute:
8869 if (attr.isStandardAttributeSyntax()) {
8870 state.getSema().Diag(attr.getLoc(),
8871 diag::warn_unknown_attribute_ignored)
8872 << attr << attr.getRange();
8873 // Mark the attribute as invalid so we don't emit the same diagnostic
8874 // multiple times.
8875 attr.setInvalid();
8876 }
8877 break;
8878
8879 case ParsedAttr::IgnoredAttribute:
8880 break;
8881
8882 case ParsedAttr::AT_BTFTypeTag:
8883 HandleBTFTypeTagAttribute(type, attr, state);
8884 attr.setUsedAsTypeAttr();
8885 break;
8886
8887 case ParsedAttr::AT_MayAlias:
8888 // FIXME: This attribute needs to actually be handled, but if we ignore
8889 // it it breaks large amounts of Linux software.
8890 attr.setUsedAsTypeAttr();
8891 break;
8892 case ParsedAttr::AT_OpenCLPrivateAddressSpace:
8893 case ParsedAttr::AT_OpenCLGlobalAddressSpace:
8894 case ParsedAttr::AT_OpenCLGlobalDeviceAddressSpace:
8895 case ParsedAttr::AT_OpenCLGlobalHostAddressSpace:
8896 case ParsedAttr::AT_OpenCLLocalAddressSpace:
8897 case ParsedAttr::AT_OpenCLConstantAddressSpace:
8898 case ParsedAttr::AT_OpenCLGenericAddressSpace:
8899 case ParsedAttr::AT_HLSLGroupSharedAddressSpace:
8900 case ParsedAttr::AT_AddressSpace:
8901 HandleAddressSpaceTypeAttribute(type, attr, state);
8902 attr.setUsedAsTypeAttr();
8903 break;
8904 OBJC_POINTER_TYPE_ATTRS_CASELIST:
8905 if (!handleObjCPointerTypeAttr(state, attr, type))
8906 distributeObjCPointerTypeAttr(state, attr, type);
8907 attr.setUsedAsTypeAttr();
8908 break;
8909 case ParsedAttr::AT_VectorSize:
8910 HandleVectorSizeAttr(type, attr, state.getSema());
8911 attr.setUsedAsTypeAttr();
8912 break;
8913 case ParsedAttr::AT_ExtVectorType:
8914 HandleExtVectorTypeAttr(type, attr, state.getSema());
8915 attr.setUsedAsTypeAttr();
8916 break;
8917 case ParsedAttr::AT_NeonVectorType:
8918 HandleNeonVectorTypeAttr(type, attr, state.getSema(), VectorKind::Neon);
8919 attr.setUsedAsTypeAttr();
8920 break;
8921 case ParsedAttr::AT_NeonPolyVectorType:
8922 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
8923 VectorKind::NeonPoly);
8924 attr.setUsedAsTypeAttr();
8925 break;
8926 case ParsedAttr::AT_ArmSveVectorBits:
8927 HandleArmSveVectorBitsTypeAttr(type, attr, state.getSema());
8928 attr.setUsedAsTypeAttr();
8929 break;
8930 case ParsedAttr::AT_ArmMveStrictPolymorphism: {
8931 HandleArmMveStrictPolymorphismAttr(state, type, attr);
8932 attr.setUsedAsTypeAttr();
8933 break;
8934 }
8935 case ParsedAttr::AT_RISCVRVVVectorBits:
8936 HandleRISCVRVVVectorBitsTypeAttr(type, attr, state.getSema());
8937 attr.setUsedAsTypeAttr();
8938 break;
8939 case ParsedAttr::AT_OpenCLAccess:
8940 HandleOpenCLAccessAttr(type, attr, state.getSema());
8941 attr.setUsedAsTypeAttr();
8942 break;
8943 case ParsedAttr::AT_LifetimeBound:
8944 if (TAL == TAL_DeclChunk)
8945 HandleLifetimeBoundAttr(state, type, attr);
8946 break;
8947
8948 case ParsedAttr::AT_NoDeref: {
8949 // FIXME: `noderef` currently doesn't work correctly in [[]] syntax.
8950 // See https://github.com/llvm/llvm-project/issues/55790 for details.
8951 // For the time being, we simply emit a warning that the attribute is
8952 // ignored.
8953 if (attr.isStandardAttributeSyntax()) {
8954 state.getSema().Diag(attr.getLoc(), diag::warn_attribute_ignored)
8955 << attr;
8956 break;
8957 }
8958 ASTContext &Ctx = state.getSema().Context;
8959 type = state.getAttributedType(createSimpleAttr<NoDerefAttr>(Ctx, attr),
8960 type, type);
8961 attr.setUsedAsTypeAttr();
8962 state.setParsedNoDeref(true);
8963 break;
8964 }
8965
8966 case ParsedAttr::AT_MatrixType:
8967 HandleMatrixTypeAttr(type, attr, state.getSema());
8968 attr.setUsedAsTypeAttr();
8969 break;
8970
8971 case ParsedAttr::AT_WebAssemblyFuncref: {
8972 if (!HandleWebAssemblyFuncrefAttr(state, type, attr))
8973 attr.setUsedAsTypeAttr();
8974 break;
8975 }
8976
8977 case ParsedAttr::AT_HLSLParamModifier: {
8978 HandleHLSLParamModifierAttr(type, attr, state.getSema());
8979 attr.setUsedAsTypeAttr();
8980 break;
8981 }
8982
8983 MS_TYPE_ATTRS_CASELIST:
8984 if (!handleMSPointerTypeQualifierAttr(state, attr, type))
8985 attr.setUsedAsTypeAttr();
8986 break;
8987
8988
8989 NULLABILITY_TYPE_ATTRS_CASELIST:
8990 // Either add nullability here or try to distribute it. We
8991 // don't want to distribute the nullability specifier past any
8992 // dependent type, because that complicates the user model.
8993 if (type->canHaveNullability() || type->isDependentType() ||
8994 type->isArrayType() ||
8995 !distributeNullabilityTypeAttr(state, type, attr)) {
8996 unsigned endIndex;
8997 if (TAL == TAL_DeclChunk)
8998 endIndex = state.getCurrentChunkIndex();
8999 else
9000 endIndex = state.getDeclarator().getNumTypeObjects();
9001 bool allowOnArrayType =
9002 state.getDeclarator().isPrototypeContext() &&
9003 !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex);
9004 if (CheckNullabilityTypeSpecifier(state, type, attr,
9005 allowOnArrayType)) {
9006 attr.setInvalid();
9007 }
9008
9009 attr.setUsedAsTypeAttr();
9010 }
9011 break;
9012
9013 case ParsedAttr::AT_ObjCKindOf:
9014 // '__kindof' must be part of the decl-specifiers.
9015 switch (TAL) {
9016 case TAL_DeclSpec:
9017 break;
9018
9019 case TAL_DeclChunk:
9020 case TAL_DeclName:
9021 state.getSema().Diag(attr.getLoc(),
9022 diag::err_objc_kindof_wrong_position)
9023 << FixItHint::CreateRemoval(attr.getLoc())
9024 << FixItHint::CreateInsertion(
9025 state.getDeclarator().getDeclSpec().getBeginLoc(),
9026 "__kindof ");
9027 break;
9028 }
9029
9030 // Apply it regardless.
9031 if (checkObjCKindOfType(state, type, attr))
9032 attr.setInvalid();
9033 break;
9034
9035 case ParsedAttr::AT_NoThrow:
9036 // Exception Specifications aren't generally supported in C mode throughout
9037 // clang, so revert to attribute-based handling for C.
9038 if (!state.getSema().getLangOpts().CPlusPlus)
9039 break;
9040 [[fallthrough]];
9041 FUNCTION_TYPE_ATTRS_CASELIST:
9042 attr.setUsedAsTypeAttr();
9043
9044 // Attributes with standard syntax have strict rules for what they
9045 // appertain to and hence should not use the "distribution" logic below.
9046 if (attr.isStandardAttributeSyntax() ||
9047 attr.isRegularKeywordAttribute()) {
9048 if (!handleFunctionTypeAttr(state, attr, type, CFT)) {
9049 diagnoseBadTypeAttribute(state.getSema(), attr, type);
9050 attr.setInvalid();
9051 }
9052 break;
9053 }
9054
9055 // Never process function type attributes as part of the
9056 // declaration-specifiers.
9057 if (TAL == TAL_DeclSpec)
9058 distributeFunctionTypeAttrFromDeclSpec(state, attr, type, CFT);
9059
9060 // Otherwise, handle the possible delays.
9061 else if (!handleFunctionTypeAttr(state, attr, type, CFT))
9062 distributeFunctionTypeAttr(state, attr, type);
9063 break;
9064 case ParsedAttr::AT_AcquireHandle: {
9065 if (!type->isFunctionType())
9066 return;
9067
9068 if (attr.getNumArgs() != 1) {
9069 state.getSema().Diag(attr.getLoc(),
9070 diag::err_attribute_wrong_number_arguments)
9071 << attr << 1;
9072 attr.setInvalid();
9073 return;
9074 }
9075
9076 StringRef HandleType;
9077 if (!state.getSema().checkStringLiteralArgumentAttr(attr, 0, HandleType))
9078 return;
9079 type = state.getAttributedType(
9080 AcquireHandleAttr::Create(state.getSema().Context, HandleType, attr),
9081 type, type);
9082 attr.setUsedAsTypeAttr();
9083 break;
9084 }
9085 case ParsedAttr::AT_AnnotateType: {
9086 HandleAnnotateTypeAttr(state, type, attr);
9087 attr.setUsedAsTypeAttr();
9088 break;
9089 }
9090 }
9091
9092 // Handle attributes that are defined in a macro. We do not want this to be
9093 // applied to ObjC builtin attributes.
9094 if (isa<AttributedType>(type) && attr.hasMacroIdentifier() &&
9095 !type.getQualifiers().hasObjCLifetime() &&
9096 !type.getQualifiers().hasObjCGCAttr() &&
9097 attr.getKind() != ParsedAttr::AT_ObjCGC &&
9098 attr.getKind() != ParsedAttr::AT_ObjCOwnership) {
9099 const IdentifierInfo *MacroII = attr.getMacroIdentifier();
9100 type = state.getSema().Context.getMacroQualifiedType(type, MacroII);
9101 state.setExpansionLocForMacroQualifiedType(
9102 cast<MacroQualifiedType>(type.getTypePtr()),
9103 attr.getMacroExpansionLoc());
9104 }
9105 }
9106 }
9107
completeExprArrayBound(Expr * E)9108 void Sema::completeExprArrayBound(Expr *E) {
9109 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
9110 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
9111 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
9112 auto *Def = Var->getDefinition();
9113 if (!Def) {
9114 SourceLocation PointOfInstantiation = E->getExprLoc();
9115 runWithSufficientStackSpace(PointOfInstantiation, [&] {
9116 InstantiateVariableDefinition(PointOfInstantiation, Var);
9117 });
9118 Def = Var->getDefinition();
9119
9120 // If we don't already have a point of instantiation, and we managed
9121 // to instantiate a definition, this is the point of instantiation.
9122 // Otherwise, we don't request an end-of-TU instantiation, so this is
9123 // not a point of instantiation.
9124 // FIXME: Is this really the right behavior?
9125 if (Var->getPointOfInstantiation().isInvalid() && Def) {
9126 assert(Var->getTemplateSpecializationKind() ==
9127 TSK_ImplicitInstantiation &&
9128 "explicit instantiation with no point of instantiation");
9129 Var->setTemplateSpecializationKind(
9130 Var->getTemplateSpecializationKind(), PointOfInstantiation);
9131 }
9132 }
9133
9134 // Update the type to the definition's type both here and within the
9135 // expression.
9136 if (Def) {
9137 DRE->setDecl(Def);
9138 QualType T = Def->getType();
9139 DRE->setType(T);
9140 // FIXME: Update the type on all intervening expressions.
9141 E->setType(T);
9142 }
9143
9144 // We still go on to try to complete the type independently, as it
9145 // may also require instantiations or diagnostics if it remains
9146 // incomplete.
9147 }
9148 }
9149 }
9150 }
9151
getCompletedType(Expr * E)9152 QualType Sema::getCompletedType(Expr *E) {
9153 // Incomplete array types may be completed by the initializer attached to
9154 // their definitions. For static data members of class templates and for
9155 // variable templates, we need to instantiate the definition to get this
9156 // initializer and complete the type.
9157 if (E->getType()->isIncompleteArrayType())
9158 completeExprArrayBound(E);
9159
9160 // FIXME: Are there other cases which require instantiating something other
9161 // than the type to complete the type of an expression?
9162
9163 return E->getType();
9164 }
9165
9166 /// Ensure that the type of the given expression is complete.
9167 ///
9168 /// This routine checks whether the expression \p E has a complete type. If the
9169 /// expression refers to an instantiable construct, that instantiation is
9170 /// performed as needed to complete its type. Furthermore
9171 /// Sema::RequireCompleteType is called for the expression's type (or in the
9172 /// case of a reference type, the referred-to type).
9173 ///
9174 /// \param E The expression whose type is required to be complete.
9175 /// \param Kind Selects which completeness rules should be applied.
9176 /// \param Diagnoser The object that will emit a diagnostic if the type is
9177 /// incomplete.
9178 ///
9179 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
9180 /// otherwise.
RequireCompleteExprType(Expr * E,CompleteTypeKind Kind,TypeDiagnoser & Diagnoser)9181 bool Sema::RequireCompleteExprType(Expr *E, CompleteTypeKind Kind,
9182 TypeDiagnoser &Diagnoser) {
9183 return RequireCompleteType(E->getExprLoc(), getCompletedType(E), Kind,
9184 Diagnoser);
9185 }
9186
RequireCompleteExprType(Expr * E,unsigned DiagID)9187 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
9188 BoundTypeDiagnoser<> Diagnoser(DiagID);
9189 return RequireCompleteExprType(E, CompleteTypeKind::Default, Diagnoser);
9190 }
9191
9192 /// Ensure that the type T is a complete type.
9193 ///
9194 /// This routine checks whether the type @p T is complete in any
9195 /// context where a complete type is required. If @p T is a complete
9196 /// type, returns false. If @p T is a class template specialization,
9197 /// this routine then attempts to perform class template
9198 /// instantiation. If instantiation fails, or if @p T is incomplete
9199 /// and cannot be completed, issues the diagnostic @p diag (giving it
9200 /// the type @p T) and returns true.
9201 ///
9202 /// @param Loc The location in the source that the incomplete type
9203 /// diagnostic should refer to.
9204 ///
9205 /// @param T The type that this routine is examining for completeness.
9206 ///
9207 /// @param Kind Selects which completeness rules should be applied.
9208 ///
9209 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
9210 /// @c false otherwise.
RequireCompleteType(SourceLocation Loc,QualType T,CompleteTypeKind Kind,TypeDiagnoser & Diagnoser)9211 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
9212 CompleteTypeKind Kind,
9213 TypeDiagnoser &Diagnoser) {
9214 if (RequireCompleteTypeImpl(Loc, T, Kind, &Diagnoser))
9215 return true;
9216 if (const TagType *Tag = T->getAs<TagType>()) {
9217 if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
9218 Tag->getDecl()->setCompleteDefinitionRequired();
9219 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
9220 }
9221 }
9222 return false;
9223 }
9224
hasStructuralCompatLayout(Decl * D,Decl * Suggested)9225 bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
9226 llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
9227 if (!Suggested)
9228 return false;
9229
9230 // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
9231 // and isolate from other C++ specific checks.
9232 StructuralEquivalenceContext Ctx(
9233 D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
9234 StructuralEquivalenceKind::Default,
9235 false /*StrictTypeSpelling*/, true /*Complain*/,
9236 true /*ErrorOnTagTypeMismatch*/);
9237 return Ctx.IsEquivalent(D, Suggested);
9238 }
9239
hasAcceptableDefinition(NamedDecl * D,NamedDecl ** Suggested,AcceptableKind Kind,bool OnlyNeedComplete)9240 bool Sema::hasAcceptableDefinition(NamedDecl *D, NamedDecl **Suggested,
9241 AcceptableKind Kind, bool OnlyNeedComplete) {
9242 // Easy case: if we don't have modules, all declarations are visible.
9243 if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility)
9244 return true;
9245
9246 // If this definition was instantiated from a template, map back to the
9247 // pattern from which it was instantiated.
9248 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
9249 // We're in the middle of defining it; this definition should be treated
9250 // as visible.
9251 return true;
9252 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
9253 if (auto *Pattern = RD->getTemplateInstantiationPattern())
9254 RD = Pattern;
9255 D = RD->getDefinition();
9256 } else if (auto *ED = dyn_cast<EnumDecl>(D)) {
9257 if (auto *Pattern = ED->getTemplateInstantiationPattern())
9258 ED = Pattern;
9259 if (OnlyNeedComplete && (ED->isFixed() || getLangOpts().MSVCCompat)) {
9260 // If the enum has a fixed underlying type, it may have been forward
9261 // declared. In -fms-compatibility, `enum Foo;` will also forward declare
9262 // the enum and assign it the underlying type of `int`. Since we're only
9263 // looking for a complete type (not a definition), any visible declaration
9264 // of it will do.
9265 *Suggested = nullptr;
9266 for (auto *Redecl : ED->redecls()) {
9267 if (isAcceptable(Redecl, Kind))
9268 return true;
9269 if (Redecl->isThisDeclarationADefinition() ||
9270 (Redecl->isCanonicalDecl() && !*Suggested))
9271 *Suggested = Redecl;
9272 }
9273
9274 return false;
9275 }
9276 D = ED->getDefinition();
9277 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
9278 if (auto *Pattern = FD->getTemplateInstantiationPattern())
9279 FD = Pattern;
9280 D = FD->getDefinition();
9281 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
9282 if (auto *Pattern = VD->getTemplateInstantiationPattern())
9283 VD = Pattern;
9284 D = VD->getDefinition();
9285 }
9286
9287 assert(D && "missing definition for pattern of instantiated definition");
9288
9289 *Suggested = D;
9290
9291 auto DefinitionIsAcceptable = [&] {
9292 // The (primary) definition might be in a visible module.
9293 if (isAcceptable(D, Kind))
9294 return true;
9295
9296 // A visible module might have a merged definition instead.
9297 if (D->isModulePrivate() ? hasMergedDefinitionInCurrentModule(D)
9298 : hasVisibleMergedDefinition(D)) {
9299 if (CodeSynthesisContexts.empty() &&
9300 !getLangOpts().ModulesLocalVisibility) {
9301 // Cache the fact that this definition is implicitly visible because
9302 // there is a visible merged definition.
9303 D->setVisibleDespiteOwningModule();
9304 }
9305 return true;
9306 }
9307
9308 return false;
9309 };
9310
9311 if (DefinitionIsAcceptable())
9312 return true;
9313
9314 // The external source may have additional definitions of this entity that are
9315 // visible, so complete the redeclaration chain now and ask again.
9316 if (auto *Source = Context.getExternalSource()) {
9317 Source->CompleteRedeclChain(D);
9318 return DefinitionIsAcceptable();
9319 }
9320
9321 return false;
9322 }
9323
9324 /// Determine whether there is any declaration of \p D that was ever a
9325 /// definition (perhaps before module merging) and is currently visible.
9326 /// \param D The definition of the entity.
9327 /// \param Suggested Filled in with the declaration that should be made visible
9328 /// in order to provide a definition of this entity.
9329 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
9330 /// not defined. This only matters for enums with a fixed underlying
9331 /// type, since in all other cases, a type is complete if and only if it
9332 /// is defined.
hasVisibleDefinition(NamedDecl * D,NamedDecl ** Suggested,bool OnlyNeedComplete)9333 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
9334 bool OnlyNeedComplete) {
9335 return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Visible,
9336 OnlyNeedComplete);
9337 }
9338
9339 /// Determine whether there is any declaration of \p D that was ever a
9340 /// definition (perhaps before module merging) and is currently
9341 /// reachable.
9342 /// \param D The definition of the entity.
9343 /// \param Suggested Filled in with the declaration that should be made
9344 /// reachable
9345 /// in order to provide a definition of this entity.
9346 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
9347 /// not defined. This only matters for enums with a fixed underlying
9348 /// type, since in all other cases, a type is complete if and only if it
9349 /// is defined.
hasReachableDefinition(NamedDecl * D,NamedDecl ** Suggested,bool OnlyNeedComplete)9350 bool Sema::hasReachableDefinition(NamedDecl *D, NamedDecl **Suggested,
9351 bool OnlyNeedComplete) {
9352 return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Reachable,
9353 OnlyNeedComplete);
9354 }
9355
9356 /// Locks in the inheritance model for the given class and all of its bases.
assignInheritanceModel(Sema & S,CXXRecordDecl * RD)9357 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
9358 RD = RD->getMostRecentNonInjectedDecl();
9359 if (!RD->hasAttr<MSInheritanceAttr>()) {
9360 MSInheritanceModel IM;
9361 bool BestCase = false;
9362 switch (S.MSPointerToMemberRepresentationMethod) {
9363 case LangOptions::PPTMK_BestCase:
9364 BestCase = true;
9365 IM = RD->calculateInheritanceModel();
9366 break;
9367 case LangOptions::PPTMK_FullGeneralitySingleInheritance:
9368 IM = MSInheritanceModel::Single;
9369 break;
9370 case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
9371 IM = MSInheritanceModel::Multiple;
9372 break;
9373 case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
9374 IM = MSInheritanceModel::Unspecified;
9375 break;
9376 }
9377
9378 SourceRange Loc = S.ImplicitMSInheritanceAttrLoc.isValid()
9379 ? S.ImplicitMSInheritanceAttrLoc
9380 : RD->getSourceRange();
9381 RD->addAttr(MSInheritanceAttr::CreateImplicit(
9382 S.getASTContext(), BestCase, Loc, MSInheritanceAttr::Spelling(IM)));
9383 S.Consumer.AssignInheritanceModel(RD);
9384 }
9385 }
9386
9387 /// The implementation of RequireCompleteType
RequireCompleteTypeImpl(SourceLocation Loc,QualType T,CompleteTypeKind Kind,TypeDiagnoser * Diagnoser)9388 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
9389 CompleteTypeKind Kind,
9390 TypeDiagnoser *Diagnoser) {
9391 // FIXME: Add this assertion to make sure we always get instantiation points.
9392 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
9393 // FIXME: Add this assertion to help us flush out problems with
9394 // checking for dependent types and type-dependent expressions.
9395 //
9396 // assert(!T->isDependentType() &&
9397 // "Can't ask whether a dependent type is complete");
9398
9399 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
9400 if (!MPTy->getClass()->isDependentType()) {
9401 if (getLangOpts().CompleteMemberPointers &&
9402 !MPTy->getClass()->getAsCXXRecordDecl()->isBeingDefined() &&
9403 RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), Kind,
9404 diag::err_memptr_incomplete))
9405 return true;
9406
9407 // We lock in the inheritance model once somebody has asked us to ensure
9408 // that a pointer-to-member type is complete.
9409 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
9410 (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0));
9411 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
9412 }
9413 }
9414 }
9415
9416 NamedDecl *Def = nullptr;
9417 bool AcceptSizeless = (Kind == CompleteTypeKind::AcceptSizeless);
9418 bool Incomplete = (T->isIncompleteType(&Def) ||
9419 (!AcceptSizeless && T->isSizelessBuiltinType()));
9420
9421 // Check that any necessary explicit specializations are visible. For an
9422 // enum, we just need the declaration, so don't check this.
9423 if (Def && !isa<EnumDecl>(Def))
9424 checkSpecializationReachability(Loc, Def);
9425
9426 // If we have a complete type, we're done.
9427 if (!Incomplete) {
9428 NamedDecl *Suggested = nullptr;
9429 if (Def &&
9430 !hasReachableDefinition(Def, &Suggested, /*OnlyNeedComplete=*/true)) {
9431 // If the user is going to see an error here, recover by making the
9432 // definition visible.
9433 bool TreatAsComplete = Diagnoser && !isSFINAEContext();
9434 if (Diagnoser && Suggested)
9435 diagnoseMissingImport(Loc, Suggested, MissingImportKind::Definition,
9436 /*Recover*/ TreatAsComplete);
9437 return !TreatAsComplete;
9438 } else if (Def && !TemplateInstCallbacks.empty()) {
9439 CodeSynthesisContext TempInst;
9440 TempInst.Kind = CodeSynthesisContext::Memoization;
9441 TempInst.Template = Def;
9442 TempInst.Entity = Def;
9443 TempInst.PointOfInstantiation = Loc;
9444 atTemplateBegin(TemplateInstCallbacks, *this, TempInst);
9445 atTemplateEnd(TemplateInstCallbacks, *this, TempInst);
9446 }
9447
9448 return false;
9449 }
9450
9451 TagDecl *Tag = dyn_cast_or_null<TagDecl>(Def);
9452 ObjCInterfaceDecl *IFace = dyn_cast_or_null<ObjCInterfaceDecl>(Def);
9453
9454 // Give the external source a chance to provide a definition of the type.
9455 // This is kept separate from completing the redeclaration chain so that
9456 // external sources such as LLDB can avoid synthesizing a type definition
9457 // unless it's actually needed.
9458 if (Tag || IFace) {
9459 // Avoid diagnosing invalid decls as incomplete.
9460 if (Def->isInvalidDecl())
9461 return true;
9462
9463 // Give the external AST source a chance to complete the type.
9464 if (auto *Source = Context.getExternalSource()) {
9465 if (Tag && Tag->hasExternalLexicalStorage())
9466 Source->CompleteType(Tag);
9467 if (IFace && IFace->hasExternalLexicalStorage())
9468 Source->CompleteType(IFace);
9469 // If the external source completed the type, go through the motions
9470 // again to ensure we're allowed to use the completed type.
9471 if (!T->isIncompleteType())
9472 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
9473 }
9474 }
9475
9476 // If we have a class template specialization or a class member of a
9477 // class template specialization, or an array with known size of such,
9478 // try to instantiate it.
9479 if (auto *RD = dyn_cast_or_null<CXXRecordDecl>(Tag)) {
9480 bool Instantiated = false;
9481 bool Diagnosed = false;
9482 if (RD->isDependentContext()) {
9483 // Don't try to instantiate a dependent class (eg, a member template of
9484 // an instantiated class template specialization).
9485 // FIXME: Can this ever happen?
9486 } else if (auto *ClassTemplateSpec =
9487 dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
9488 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
9489 runWithSufficientStackSpace(Loc, [&] {
9490 Diagnosed = InstantiateClassTemplateSpecialization(
9491 Loc, ClassTemplateSpec, TSK_ImplicitInstantiation,
9492 /*Complain=*/Diagnoser);
9493 });
9494 Instantiated = true;
9495 }
9496 } else {
9497 CXXRecordDecl *Pattern = RD->getInstantiatedFromMemberClass();
9498 if (!RD->isBeingDefined() && Pattern) {
9499 MemberSpecializationInfo *MSI = RD->getMemberSpecializationInfo();
9500 assert(MSI && "Missing member specialization information?");
9501 // This record was instantiated from a class within a template.
9502 if (MSI->getTemplateSpecializationKind() !=
9503 TSK_ExplicitSpecialization) {
9504 runWithSufficientStackSpace(Loc, [&] {
9505 Diagnosed = InstantiateClass(Loc, RD, Pattern,
9506 getTemplateInstantiationArgs(RD),
9507 TSK_ImplicitInstantiation,
9508 /*Complain=*/Diagnoser);
9509 });
9510 Instantiated = true;
9511 }
9512 }
9513 }
9514
9515 if (Instantiated) {
9516 // Instantiate* might have already complained that the template is not
9517 // defined, if we asked it to.
9518 if (Diagnoser && Diagnosed)
9519 return true;
9520 // If we instantiated a definition, check that it's usable, even if
9521 // instantiation produced an error, so that repeated calls to this
9522 // function give consistent answers.
9523 if (!T->isIncompleteType())
9524 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
9525 }
9526 }
9527
9528 // FIXME: If we didn't instantiate a definition because of an explicit
9529 // specialization declaration, check that it's visible.
9530
9531 if (!Diagnoser)
9532 return true;
9533
9534 Diagnoser->diagnose(*this, Loc, T);
9535
9536 // If the type was a forward declaration of a class/struct/union
9537 // type, produce a note.
9538 if (Tag && !Tag->isInvalidDecl() && !Tag->getLocation().isInvalid())
9539 Diag(Tag->getLocation(),
9540 Tag->isBeingDefined() ? diag::note_type_being_defined
9541 : diag::note_forward_declaration)
9542 << Context.getTagDeclType(Tag);
9543
9544 // If the Objective-C class was a forward declaration, produce a note.
9545 if (IFace && !IFace->isInvalidDecl() && !IFace->getLocation().isInvalid())
9546 Diag(IFace->getLocation(), diag::note_forward_class);
9547
9548 // If we have external information that we can use to suggest a fix,
9549 // produce a note.
9550 if (ExternalSource)
9551 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);
9552
9553 return true;
9554 }
9555
RequireCompleteType(SourceLocation Loc,QualType T,CompleteTypeKind Kind,unsigned DiagID)9556 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
9557 CompleteTypeKind Kind, unsigned DiagID) {
9558 BoundTypeDiagnoser<> Diagnoser(DiagID);
9559 return RequireCompleteType(Loc, T, Kind, Diagnoser);
9560 }
9561
9562 /// Get diagnostic %select index for tag kind for
9563 /// literal type diagnostic message.
9564 /// WARNING: Indexes apply to particular diagnostics only!
9565 ///
9566 /// \returns diagnostic %select index.
getLiteralDiagFromTagKind(TagTypeKind Tag)9567 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
9568 switch (Tag) {
9569 case TagTypeKind::Struct:
9570 return 0;
9571 case TagTypeKind::Interface:
9572 return 1;
9573 case TagTypeKind::Class:
9574 return 2;
9575 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!");
9576 }
9577 }
9578
9579 /// Ensure that the type T is a literal type.
9580 ///
9581 /// This routine checks whether the type @p T is a literal type. If @p T is an
9582 /// incomplete type, an attempt is made to complete it. If @p T is a literal
9583 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
9584 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
9585 /// it the type @p T), along with notes explaining why the type is not a
9586 /// literal type, and returns true.
9587 ///
9588 /// @param Loc The location in the source that the non-literal type
9589 /// diagnostic should refer to.
9590 ///
9591 /// @param T The type that this routine is examining for literalness.
9592 ///
9593 /// @param Diagnoser Emits a diagnostic if T is not a literal type.
9594 ///
9595 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
9596 /// @c false otherwise.
RequireLiteralType(SourceLocation Loc,QualType T,TypeDiagnoser & Diagnoser)9597 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
9598 TypeDiagnoser &Diagnoser) {
9599 assert(!T->isDependentType() && "type should not be dependent");
9600
9601 QualType ElemType = Context.getBaseElementType(T);
9602 if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) &&
9603 T->isLiteralType(Context))
9604 return false;
9605
9606 Diagnoser.diagnose(*this, Loc, T);
9607
9608 if (T->isVariableArrayType())
9609 return true;
9610
9611 const RecordType *RT = ElemType->getAs<RecordType>();
9612 if (!RT)
9613 return true;
9614
9615 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
9616
9617 // A partially-defined class type can't be a literal type, because a literal
9618 // class type must have a trivial destructor (which can't be checked until
9619 // the class definition is complete).
9620 if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T))
9621 return true;
9622
9623 // [expr.prim.lambda]p3:
9624 // This class type is [not] a literal type.
9625 if (RD->isLambda() && !getLangOpts().CPlusPlus17) {
9626 Diag(RD->getLocation(), diag::note_non_literal_lambda);
9627 return true;
9628 }
9629
9630 // If the class has virtual base classes, then it's not an aggregate, and
9631 // cannot have any constexpr constructors or a trivial default constructor,
9632 // so is non-literal. This is better to diagnose than the resulting absence
9633 // of constexpr constructors.
9634 if (RD->getNumVBases()) {
9635 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
9636 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
9637 for (const auto &I : RD->vbases())
9638 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
9639 << I.getSourceRange();
9640 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
9641 !RD->hasTrivialDefaultConstructor()) {
9642 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
9643 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
9644 for (const auto &I : RD->bases()) {
9645 if (!I.getType()->isLiteralType(Context)) {
9646 Diag(I.getBeginLoc(), diag::note_non_literal_base_class)
9647 << RD << I.getType() << I.getSourceRange();
9648 return true;
9649 }
9650 }
9651 for (const auto *I : RD->fields()) {
9652 if (!I->getType()->isLiteralType(Context) ||
9653 I->getType().isVolatileQualified()) {
9654 Diag(I->getLocation(), diag::note_non_literal_field)
9655 << RD << I << I->getType()
9656 << I->getType().isVolatileQualified();
9657 return true;
9658 }
9659 }
9660 } else if (getLangOpts().CPlusPlus20 ? !RD->hasConstexprDestructor()
9661 : !RD->hasTrivialDestructor()) {
9662 // All fields and bases are of literal types, so have trivial or constexpr
9663 // destructors. If this class's destructor is non-trivial / non-constexpr,
9664 // it must be user-declared.
9665 CXXDestructorDecl *Dtor = RD->getDestructor();
9666 assert(Dtor && "class has literal fields and bases but no dtor?");
9667 if (!Dtor)
9668 return true;
9669
9670 if (getLangOpts().CPlusPlus20) {
9671 Diag(Dtor->getLocation(), diag::note_non_literal_non_constexpr_dtor)
9672 << RD;
9673 } else {
9674 Diag(Dtor->getLocation(), Dtor->isUserProvided()
9675 ? diag::note_non_literal_user_provided_dtor
9676 : diag::note_non_literal_nontrivial_dtor)
9677 << RD;
9678 if (!Dtor->isUserProvided())
9679 SpecialMemberIsTrivial(Dtor, CXXDestructor, TAH_IgnoreTrivialABI,
9680 /*Diagnose*/ true);
9681 }
9682 }
9683
9684 return true;
9685 }
9686
RequireLiteralType(SourceLocation Loc,QualType T,unsigned DiagID)9687 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
9688 BoundTypeDiagnoser<> Diagnoser(DiagID);
9689 return RequireLiteralType(Loc, T, Diagnoser);
9690 }
9691
9692 /// Retrieve a version of the type 'T' that is elaborated by Keyword, qualified
9693 /// by the nested-name-specifier contained in SS, and that is (re)declared by
9694 /// OwnedTagDecl, which is nullptr if this is not a (re)declaration.
getElaboratedType(ElaboratedTypeKeyword Keyword,const CXXScopeSpec & SS,QualType T,TagDecl * OwnedTagDecl)9695 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
9696 const CXXScopeSpec &SS, QualType T,
9697 TagDecl *OwnedTagDecl) {
9698 if (T.isNull())
9699 return T;
9700 return Context.getElaboratedType(
9701 Keyword, SS.isValid() ? SS.getScopeRep() : nullptr, T, OwnedTagDecl);
9702 }
9703
BuildTypeofExprType(Expr * E,TypeOfKind Kind)9704 QualType Sema::BuildTypeofExprType(Expr *E, TypeOfKind Kind) {
9705 assert(!E->hasPlaceholderType() && "unexpected placeholder");
9706
9707 if (!getLangOpts().CPlusPlus && E->refersToBitField())
9708 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
9709 << (Kind == TypeOfKind::Unqualified ? 3 : 2);
9710
9711 if (!E->isTypeDependent()) {
9712 QualType T = E->getType();
9713 if (const TagType *TT = T->getAs<TagType>())
9714 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
9715 }
9716 return Context.getTypeOfExprType(E, Kind);
9717 }
9718
9719 /// getDecltypeForExpr - Given an expr, will return the decltype for
9720 /// that expression, according to the rules in C++11
9721 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
getDecltypeForExpr(Expr * E)9722 QualType Sema::getDecltypeForExpr(Expr *E) {
9723 if (E->isTypeDependent())
9724 return Context.DependentTy;
9725
9726 Expr *IDExpr = E;
9727 if (auto *ImplCastExpr = dyn_cast<ImplicitCastExpr>(E))
9728 IDExpr = ImplCastExpr->getSubExpr();
9729
9730 // C++11 [dcl.type.simple]p4:
9731 // The type denoted by decltype(e) is defined as follows:
9732
9733 // C++20:
9734 // - if E is an unparenthesized id-expression naming a non-type
9735 // template-parameter (13.2), decltype(E) is the type of the
9736 // template-parameter after performing any necessary type deduction
9737 // Note that this does not pick up the implicit 'const' for a template
9738 // parameter object. This rule makes no difference before C++20 so we apply
9739 // it unconditionally.
9740 if (const auto *SNTTPE = dyn_cast<SubstNonTypeTemplateParmExpr>(IDExpr))
9741 return SNTTPE->getParameterType(Context);
9742
9743 // - if e is an unparenthesized id-expression or an unparenthesized class
9744 // member access (5.2.5), decltype(e) is the type of the entity named
9745 // by e. If there is no such entity, or if e names a set of overloaded
9746 // functions, the program is ill-formed;
9747 //
9748 // We apply the same rules for Objective-C ivar and property references.
9749 if (const auto *DRE = dyn_cast<DeclRefExpr>(IDExpr)) {
9750 const ValueDecl *VD = DRE->getDecl();
9751 QualType T = VD->getType();
9752 return isa<TemplateParamObjectDecl>(VD) ? T.getUnqualifiedType() : T;
9753 }
9754 if (const auto *ME = dyn_cast<MemberExpr>(IDExpr)) {
9755 if (const auto *VD = ME->getMemberDecl())
9756 if (isa<FieldDecl>(VD) || isa<VarDecl>(VD))
9757 return VD->getType();
9758 } else if (const auto *IR = dyn_cast<ObjCIvarRefExpr>(IDExpr)) {
9759 return IR->getDecl()->getType();
9760 } else if (const auto *PR = dyn_cast<ObjCPropertyRefExpr>(IDExpr)) {
9761 if (PR->isExplicitProperty())
9762 return PR->getExplicitProperty()->getType();
9763 } else if (const auto *PE = dyn_cast<PredefinedExpr>(IDExpr)) {
9764 return PE->getType();
9765 }
9766
9767 // C++11 [expr.lambda.prim]p18:
9768 // Every occurrence of decltype((x)) where x is a possibly
9769 // parenthesized id-expression that names an entity of automatic
9770 // storage duration is treated as if x were transformed into an
9771 // access to a corresponding data member of the closure type that
9772 // would have been declared if x were an odr-use of the denoted
9773 // entity.
9774 if (getCurLambda() && isa<ParenExpr>(IDExpr)) {
9775 if (auto *DRE = dyn_cast<DeclRefExpr>(IDExpr->IgnoreParens())) {
9776 if (auto *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
9777 QualType T = getCapturedDeclRefType(Var, DRE->getLocation());
9778 if (!T.isNull())
9779 return Context.getLValueReferenceType(T);
9780 }
9781 }
9782 }
9783
9784 return Context.getReferenceQualifiedType(E);
9785 }
9786
BuildDecltypeType(Expr * E,bool AsUnevaluated)9787 QualType Sema::BuildDecltypeType(Expr *E, bool AsUnevaluated) {
9788 assert(!E->hasPlaceholderType() && "unexpected placeholder");
9789
9790 if (AsUnevaluated && CodeSynthesisContexts.empty() &&
9791 !E->isInstantiationDependent() && E->HasSideEffects(Context, false)) {
9792 // The expression operand for decltype is in an unevaluated expression
9793 // context, so side effects could result in unintended consequences.
9794 // Exclude instantiation-dependent expressions, because 'decltype' is often
9795 // used to build SFINAE gadgets.
9796 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
9797 }
9798 return Context.getDecltypeType(E, getDecltypeForExpr(E));
9799 }
9800
GetEnumUnderlyingType(Sema & S,QualType BaseType,SourceLocation Loc)9801 static QualType GetEnumUnderlyingType(Sema &S, QualType BaseType,
9802 SourceLocation Loc) {
9803 assert(BaseType->isEnumeralType());
9804 EnumDecl *ED = BaseType->castAs<EnumType>()->getDecl();
9805 assert(ED && "EnumType has no EnumDecl");
9806
9807 S.DiagnoseUseOfDecl(ED, Loc);
9808
9809 QualType Underlying = ED->getIntegerType();
9810 assert(!Underlying.isNull());
9811
9812 return Underlying;
9813 }
9814
BuiltinEnumUnderlyingType(QualType BaseType,SourceLocation Loc)9815 QualType Sema::BuiltinEnumUnderlyingType(QualType BaseType,
9816 SourceLocation Loc) {
9817 if (!BaseType->isEnumeralType()) {
9818 Diag(Loc, diag::err_only_enums_have_underlying_types);
9819 return QualType();
9820 }
9821
9822 // The enum could be incomplete if we're parsing its definition or
9823 // recovering from an error.
9824 NamedDecl *FwdDecl = nullptr;
9825 if (BaseType->isIncompleteType(&FwdDecl)) {
9826 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
9827 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
9828 return QualType();
9829 }
9830
9831 return GetEnumUnderlyingType(*this, BaseType, Loc);
9832 }
9833
BuiltinAddPointer(QualType BaseType,SourceLocation Loc)9834 QualType Sema::BuiltinAddPointer(QualType BaseType, SourceLocation Loc) {
9835 QualType Pointer = BaseType.isReferenceable() || BaseType->isVoidType()
9836 ? BuildPointerType(BaseType.getNonReferenceType(), Loc,
9837 DeclarationName())
9838 : BaseType;
9839
9840 return Pointer.isNull() ? QualType() : Pointer;
9841 }
9842
BuiltinRemovePointer(QualType BaseType,SourceLocation Loc)9843 QualType Sema::BuiltinRemovePointer(QualType BaseType, SourceLocation Loc) {
9844 // We don't want block pointers or ObjectiveC's id type.
9845 if (!BaseType->isAnyPointerType() || BaseType->isObjCIdType())
9846 return BaseType;
9847
9848 return BaseType->getPointeeType();
9849 }
9850
BuiltinDecay(QualType BaseType,SourceLocation Loc)9851 QualType Sema::BuiltinDecay(QualType BaseType, SourceLocation Loc) {
9852 QualType Underlying = BaseType.getNonReferenceType();
9853 if (Underlying->isArrayType())
9854 return Context.getDecayedType(Underlying);
9855
9856 if (Underlying->isFunctionType())
9857 return BuiltinAddPointer(BaseType, Loc);
9858
9859 SplitQualType Split = Underlying.getSplitUnqualifiedType();
9860 // std::decay is supposed to produce 'std::remove_cv', but since 'restrict' is
9861 // in the same group of qualifiers as 'const' and 'volatile', we're extending
9862 // '__decay(T)' so that it removes all qualifiers.
9863 Split.Quals.removeCVRQualifiers();
9864 return Context.getQualifiedType(Split);
9865 }
9866
BuiltinAddReference(QualType BaseType,UTTKind UKind,SourceLocation Loc)9867 QualType Sema::BuiltinAddReference(QualType BaseType, UTTKind UKind,
9868 SourceLocation Loc) {
9869 assert(LangOpts.CPlusPlus);
9870 QualType Reference =
9871 BaseType.isReferenceable()
9872 ? BuildReferenceType(BaseType,
9873 UKind == UnaryTransformType::AddLvalueReference,
9874 Loc, DeclarationName())
9875 : BaseType;
9876 return Reference.isNull() ? QualType() : Reference;
9877 }
9878
BuiltinRemoveExtent(QualType BaseType,UTTKind UKind,SourceLocation Loc)9879 QualType Sema::BuiltinRemoveExtent(QualType BaseType, UTTKind UKind,
9880 SourceLocation Loc) {
9881 if (UKind == UnaryTransformType::RemoveAllExtents)
9882 return Context.getBaseElementType(BaseType);
9883
9884 if (const auto *AT = Context.getAsArrayType(BaseType))
9885 return AT->getElementType();
9886
9887 return BaseType;
9888 }
9889
BuiltinRemoveReference(QualType BaseType,UTTKind UKind,SourceLocation Loc)9890 QualType Sema::BuiltinRemoveReference(QualType BaseType, UTTKind UKind,
9891 SourceLocation Loc) {
9892 assert(LangOpts.CPlusPlus);
9893 QualType T = BaseType.getNonReferenceType();
9894 if (UKind == UTTKind::RemoveCVRef &&
9895 (T.isConstQualified() || T.isVolatileQualified())) {
9896 Qualifiers Quals;
9897 QualType Unqual = Context.getUnqualifiedArrayType(T, Quals);
9898 Quals.removeConst();
9899 Quals.removeVolatile();
9900 T = Context.getQualifiedType(Unqual, Quals);
9901 }
9902 return T;
9903 }
9904
BuiltinChangeCVRQualifiers(QualType BaseType,UTTKind UKind,SourceLocation Loc)9905 QualType Sema::BuiltinChangeCVRQualifiers(QualType BaseType, UTTKind UKind,
9906 SourceLocation Loc) {
9907 if ((BaseType->isReferenceType() && UKind != UTTKind::RemoveRestrict) ||
9908 BaseType->isFunctionType())
9909 return BaseType;
9910
9911 Qualifiers Quals;
9912 QualType Unqual = Context.getUnqualifiedArrayType(BaseType, Quals);
9913
9914 if (UKind == UTTKind::RemoveConst || UKind == UTTKind::RemoveCV)
9915 Quals.removeConst();
9916 if (UKind == UTTKind::RemoveVolatile || UKind == UTTKind::RemoveCV)
9917 Quals.removeVolatile();
9918 if (UKind == UTTKind::RemoveRestrict)
9919 Quals.removeRestrict();
9920
9921 return Context.getQualifiedType(Unqual, Quals);
9922 }
9923
ChangeIntegralSignedness(Sema & S,QualType BaseType,bool IsMakeSigned,SourceLocation Loc)9924 static QualType ChangeIntegralSignedness(Sema &S, QualType BaseType,
9925 bool IsMakeSigned,
9926 SourceLocation Loc) {
9927 if (BaseType->isEnumeralType()) {
9928 QualType Underlying = GetEnumUnderlyingType(S, BaseType, Loc);
9929 if (auto *BitInt = dyn_cast<BitIntType>(Underlying)) {
9930 unsigned int Bits = BitInt->getNumBits();
9931 if (Bits > 1)
9932 return S.Context.getBitIntType(!IsMakeSigned, Bits);
9933
9934 S.Diag(Loc, diag::err_make_signed_integral_only)
9935 << IsMakeSigned << /*_BitInt(1)*/ true << BaseType << 1 << Underlying;
9936 return QualType();
9937 }
9938 if (Underlying->isBooleanType()) {
9939 S.Diag(Loc, diag::err_make_signed_integral_only)
9940 << IsMakeSigned << /*_BitInt(1)*/ false << BaseType << 1
9941 << Underlying;
9942 return QualType();
9943 }
9944 }
9945
9946 bool Int128Unsupported = !S.Context.getTargetInfo().hasInt128Type();
9947 std::array<CanQualType *, 6> AllSignedIntegers = {
9948 &S.Context.SignedCharTy, &S.Context.ShortTy, &S.Context.IntTy,
9949 &S.Context.LongTy, &S.Context.LongLongTy, &S.Context.Int128Ty};
9950 ArrayRef<CanQualType *> AvailableSignedIntegers(
9951 AllSignedIntegers.data(), AllSignedIntegers.size() - Int128Unsupported);
9952 std::array<CanQualType *, 6> AllUnsignedIntegers = {
9953 &S.Context.UnsignedCharTy, &S.Context.UnsignedShortTy,
9954 &S.Context.UnsignedIntTy, &S.Context.UnsignedLongTy,
9955 &S.Context.UnsignedLongLongTy, &S.Context.UnsignedInt128Ty};
9956 ArrayRef<CanQualType *> AvailableUnsignedIntegers(AllUnsignedIntegers.data(),
9957 AllUnsignedIntegers.size() -
9958 Int128Unsupported);
9959 ArrayRef<CanQualType *> *Consider =
9960 IsMakeSigned ? &AvailableSignedIntegers : &AvailableUnsignedIntegers;
9961
9962 uint64_t BaseSize = S.Context.getTypeSize(BaseType);
9963 auto *Result =
9964 llvm::find_if(*Consider, [&S, BaseSize](const CanQual<Type> *T) {
9965 return BaseSize == S.Context.getTypeSize(T->getTypePtr());
9966 });
9967
9968 assert(Result != Consider->end());
9969 return QualType((*Result)->getTypePtr(), 0);
9970 }
9971
BuiltinChangeSignedness(QualType BaseType,UTTKind UKind,SourceLocation Loc)9972 QualType Sema::BuiltinChangeSignedness(QualType BaseType, UTTKind UKind,
9973 SourceLocation Loc) {
9974 bool IsMakeSigned = UKind == UnaryTransformType::MakeSigned;
9975 if ((!BaseType->isIntegerType() && !BaseType->isEnumeralType()) ||
9976 BaseType->isBooleanType() ||
9977 (BaseType->isBitIntType() &&
9978 BaseType->getAs<BitIntType>()->getNumBits() < 2)) {
9979 Diag(Loc, diag::err_make_signed_integral_only)
9980 << IsMakeSigned << BaseType->isBitIntType() << BaseType << 0;
9981 return QualType();
9982 }
9983
9984 bool IsNonIntIntegral =
9985 BaseType->isChar16Type() || BaseType->isChar32Type() ||
9986 BaseType->isWideCharType() || BaseType->isEnumeralType();
9987
9988 QualType Underlying =
9989 IsNonIntIntegral
9990 ? ChangeIntegralSignedness(*this, BaseType, IsMakeSigned, Loc)
9991 : IsMakeSigned ? Context.getCorrespondingSignedType(BaseType)
9992 : Context.getCorrespondingUnsignedType(BaseType);
9993 if (Underlying.isNull())
9994 return Underlying;
9995 return Context.getQualifiedType(Underlying, BaseType.getQualifiers());
9996 }
9997
BuildUnaryTransformType(QualType BaseType,UTTKind UKind,SourceLocation Loc)9998 QualType Sema::BuildUnaryTransformType(QualType BaseType, UTTKind UKind,
9999 SourceLocation Loc) {
10000 if (BaseType->isDependentType())
10001 return Context.getUnaryTransformType(BaseType, BaseType, UKind);
10002 QualType Result;
10003 switch (UKind) {
10004 case UnaryTransformType::EnumUnderlyingType: {
10005 Result = BuiltinEnumUnderlyingType(BaseType, Loc);
10006 break;
10007 }
10008 case UnaryTransformType::AddPointer: {
10009 Result = BuiltinAddPointer(BaseType, Loc);
10010 break;
10011 }
10012 case UnaryTransformType::RemovePointer: {
10013 Result = BuiltinRemovePointer(BaseType, Loc);
10014 break;
10015 }
10016 case UnaryTransformType::Decay: {
10017 Result = BuiltinDecay(BaseType, Loc);
10018 break;
10019 }
10020 case UnaryTransformType::AddLvalueReference:
10021 case UnaryTransformType::AddRvalueReference: {
10022 Result = BuiltinAddReference(BaseType, UKind, Loc);
10023 break;
10024 }
10025 case UnaryTransformType::RemoveAllExtents:
10026 case UnaryTransformType::RemoveExtent: {
10027 Result = BuiltinRemoveExtent(BaseType, UKind, Loc);
10028 break;
10029 }
10030 case UnaryTransformType::RemoveCVRef:
10031 case UnaryTransformType::RemoveReference: {
10032 Result = BuiltinRemoveReference(BaseType, UKind, Loc);
10033 break;
10034 }
10035 case UnaryTransformType::RemoveConst:
10036 case UnaryTransformType::RemoveCV:
10037 case UnaryTransformType::RemoveRestrict:
10038 case UnaryTransformType::RemoveVolatile: {
10039 Result = BuiltinChangeCVRQualifiers(BaseType, UKind, Loc);
10040 break;
10041 }
10042 case UnaryTransformType::MakeSigned:
10043 case UnaryTransformType::MakeUnsigned: {
10044 Result = BuiltinChangeSignedness(BaseType, UKind, Loc);
10045 break;
10046 }
10047 }
10048
10049 return !Result.isNull()
10050 ? Context.getUnaryTransformType(BaseType, Result, UKind)
10051 : Result;
10052 }
10053
BuildAtomicType(QualType T,SourceLocation Loc)10054 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
10055 if (!isDependentOrGNUAutoType(T)) {
10056 // FIXME: It isn't entirely clear whether incomplete atomic types
10057 // are allowed or not; for simplicity, ban them for the moment.
10058 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
10059 return QualType();
10060
10061 int DisallowedKind = -1;
10062 if (T->isArrayType())
10063 DisallowedKind = 1;
10064 else if (T->isFunctionType())
10065 DisallowedKind = 2;
10066 else if (T->isReferenceType())
10067 DisallowedKind = 3;
10068 else if (T->isAtomicType())
10069 DisallowedKind = 4;
10070 else if (T.hasQualifiers())
10071 DisallowedKind = 5;
10072 else if (T->isSizelessType())
10073 DisallowedKind = 6;
10074 else if (!T.isTriviallyCopyableType(Context) && getLangOpts().CPlusPlus)
10075 // Some other non-trivially-copyable type (probably a C++ class)
10076 DisallowedKind = 7;
10077 else if (T->isBitIntType())
10078 DisallowedKind = 8;
10079 else if (getLangOpts().C23 && T->isUndeducedAutoType())
10080 // _Atomic auto is prohibited in C23
10081 DisallowedKind = 9;
10082
10083 if (DisallowedKind != -1) {
10084 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
10085 return QualType();
10086 }
10087
10088 // FIXME: Do we need any handling for ARC here?
10089 }
10090
10091 // Build the pointer type.
10092 return Context.getAtomicType(T);
10093 }
10094