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/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/TypeLoc.h"
23 #include "clang/AST/TypeLocVisitor.h"
24 #include "clang/Basic/PartialDiagnostic.h"
25 #include "clang/Basic/TargetInfo.h"
26 #include "clang/Lex/Preprocessor.h"
27 #include "clang/Sema/DeclSpec.h"
28 #include "clang/Sema/DelayedDiagnostic.h"
29 #include "clang/Sema/Lookup.h"
30 #include "clang/Sema/ParsedTemplate.h"
31 #include "clang/Sema/ScopeInfo.h"
32 #include "clang/Sema/SemaInternal.h"
33 #include "clang/Sema/Template.h"
34 #include "clang/Sema/TemplateInstCallback.h"
35 #include "llvm/ADT/SmallPtrSet.h"
36 #include "llvm/ADT/SmallString.h"
37 #include "llvm/ADT/StringSwitch.h"
38 #include "llvm/IR/DerivedTypes.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include <bitset>
41
42 using namespace clang;
43
44 enum TypeDiagSelector {
45 TDS_Function,
46 TDS_Pointer,
47 TDS_ObjCObjOrBlock
48 };
49
50 /// isOmittedBlockReturnType - Return true if this declarator is missing a
51 /// return type because this is a omitted return type on a block literal.
isOmittedBlockReturnType(const Declarator & D)52 static bool isOmittedBlockReturnType(const Declarator &D) {
53 if (D.getContext() != DeclaratorContext::BlockLiteral ||
54 D.getDeclSpec().hasTypeSpecifier())
55 return false;
56
57 if (D.getNumTypeObjects() == 0)
58 return true; // ^{ ... }
59
60 if (D.getNumTypeObjects() == 1 &&
61 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
62 return true; // ^(int X, float Y) { ... }
63
64 return false;
65 }
66
67 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
68 /// doesn't apply to the given type.
diagnoseBadTypeAttribute(Sema & S,const ParsedAttr & attr,QualType type)69 static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
70 QualType type) {
71 TypeDiagSelector WhichType;
72 bool useExpansionLoc = true;
73 switch (attr.getKind()) {
74 case ParsedAttr::AT_ObjCGC:
75 WhichType = TDS_Pointer;
76 break;
77 case ParsedAttr::AT_ObjCOwnership:
78 WhichType = TDS_ObjCObjOrBlock;
79 break;
80 default:
81 // Assume everything else was a function attribute.
82 WhichType = TDS_Function;
83 useExpansionLoc = false;
84 break;
85 }
86
87 SourceLocation loc = attr.getLoc();
88 StringRef name = attr.getAttrName()->getName();
89
90 // The GC attributes are usually written with macros; special-case them.
91 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
92 : nullptr;
93 if (useExpansionLoc && loc.isMacroID() && II) {
94 if (II->isStr("strong")) {
95 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
96 } else if (II->isStr("weak")) {
97 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
98 }
99 }
100
101 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
102 << type;
103 }
104
105 // objc_gc applies to Objective-C pointers or, otherwise, to the
106 // smallest available pointer type (i.e. 'void*' in 'void**').
107 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
108 case ParsedAttr::AT_ObjCGC: \
109 case ParsedAttr::AT_ObjCOwnership
110
111 // Calling convention attributes.
112 #define CALLING_CONV_ATTRS_CASELIST \
113 case ParsedAttr::AT_CDecl: \
114 case ParsedAttr::AT_FastCall: \
115 case ParsedAttr::AT_StdCall: \
116 case ParsedAttr::AT_ThisCall: \
117 case ParsedAttr::AT_RegCall: \
118 case ParsedAttr::AT_Pascal: \
119 case ParsedAttr::AT_SwiftCall: \
120 case ParsedAttr::AT_SwiftAsyncCall: \
121 case ParsedAttr::AT_VectorCall: \
122 case ParsedAttr::AT_AArch64VectorPcs: \
123 case ParsedAttr::AT_MSABI: \
124 case ParsedAttr::AT_SysVABI: \
125 case ParsedAttr::AT_Pcs: \
126 case ParsedAttr::AT_IntelOclBicc: \
127 case ParsedAttr::AT_PreserveMost: \
128 case ParsedAttr::AT_PreserveAll
129
130 // Function type attributes.
131 #define FUNCTION_TYPE_ATTRS_CASELIST \
132 case ParsedAttr::AT_NSReturnsRetained: \
133 case ParsedAttr::AT_NoReturn: \
134 case ParsedAttr::AT_Regparm: \
135 case ParsedAttr::AT_CmseNSCall: \
136 case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: \
137 case ParsedAttr::AT_AnyX86NoCfCheck: \
138 CALLING_CONV_ATTRS_CASELIST
139
140 // Microsoft-specific type qualifiers.
141 #define MS_TYPE_ATTRS_CASELIST \
142 case ParsedAttr::AT_Ptr32: \
143 case ParsedAttr::AT_Ptr64: \
144 case ParsedAttr::AT_SPtr: \
145 case ParsedAttr::AT_UPtr
146
147 // Nullability qualifiers.
148 #define NULLABILITY_TYPE_ATTRS_CASELIST \
149 case ParsedAttr::AT_TypeNonNull: \
150 case ParsedAttr::AT_TypeNullable: \
151 case ParsedAttr::AT_TypeNullableResult: \
152 case ParsedAttr::AT_TypeNullUnspecified
153
154 namespace {
155 /// An object which stores processing state for the entire
156 /// GetTypeForDeclarator process.
157 class TypeProcessingState {
158 Sema &sema;
159
160 /// The declarator being processed.
161 Declarator &declarator;
162
163 /// The index of the declarator chunk we're currently processing.
164 /// May be the total number of valid chunks, indicating the
165 /// DeclSpec.
166 unsigned chunkIndex;
167
168 /// Whether there are non-trivial modifications to the decl spec.
169 bool trivial;
170
171 /// Whether we saved the attributes in the decl spec.
172 bool hasSavedAttrs;
173
174 /// The original set of attributes on the DeclSpec.
175 SmallVector<ParsedAttr *, 2> savedAttrs;
176
177 /// A list of attributes to diagnose the uselessness of when the
178 /// processing is complete.
179 SmallVector<ParsedAttr *, 2> ignoredTypeAttrs;
180
181 /// Attributes corresponding to AttributedTypeLocs that we have not yet
182 /// populated.
183 // FIXME: The two-phase mechanism by which we construct Types and fill
184 // their TypeLocs makes it hard to correctly assign these. We keep the
185 // attributes in creation order as an attempt to make them line up
186 // properly.
187 using TypeAttrPair = std::pair<const AttributedType*, const Attr*>;
188 SmallVector<TypeAttrPair, 8> AttrsForTypes;
189 bool AttrsForTypesSorted = true;
190
191 /// MacroQualifiedTypes mapping to macro expansion locations that will be
192 /// stored in a MacroQualifiedTypeLoc.
193 llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros;
194
195 /// Flag to indicate we parsed a noderef attribute. This is used for
196 /// validating that noderef was used on a pointer or array.
197 bool parsedNoDeref;
198
199 public:
TypeProcessingState(Sema & sema,Declarator & declarator)200 TypeProcessingState(Sema &sema, Declarator &declarator)
201 : sema(sema), declarator(declarator),
202 chunkIndex(declarator.getNumTypeObjects()), trivial(true),
203 hasSavedAttrs(false), parsedNoDeref(false) {}
204
getSema() const205 Sema &getSema() const {
206 return sema;
207 }
208
getDeclarator() const209 Declarator &getDeclarator() const {
210 return declarator;
211 }
212
isProcessingDeclSpec() const213 bool isProcessingDeclSpec() const {
214 return chunkIndex == declarator.getNumTypeObjects();
215 }
216
getCurrentChunkIndex() const217 unsigned getCurrentChunkIndex() const {
218 return chunkIndex;
219 }
220
setCurrentChunkIndex(unsigned idx)221 void setCurrentChunkIndex(unsigned idx) {
222 assert(idx <= declarator.getNumTypeObjects());
223 chunkIndex = idx;
224 }
225
getCurrentAttributes() const226 ParsedAttributesView &getCurrentAttributes() const {
227 if (isProcessingDeclSpec())
228 return getMutableDeclSpec().getAttributes();
229 return declarator.getTypeObject(chunkIndex).getAttrs();
230 }
231
232 /// Save the current set of attributes on the DeclSpec.
saveDeclSpecAttrs()233 void saveDeclSpecAttrs() {
234 // Don't try to save them multiple times.
235 if (hasSavedAttrs) return;
236
237 DeclSpec &spec = getMutableDeclSpec();
238 for (ParsedAttr &AL : spec.getAttributes())
239 savedAttrs.push_back(&AL);
240 trivial &= savedAttrs.empty();
241 hasSavedAttrs = true;
242 }
243
244 /// Record that we had nowhere to put the given type attribute.
245 /// We will diagnose such attributes later.
addIgnoredTypeAttr(ParsedAttr & attr)246 void addIgnoredTypeAttr(ParsedAttr &attr) {
247 ignoredTypeAttrs.push_back(&attr);
248 }
249
250 /// Diagnose all the ignored type attributes, given that the
251 /// declarator worked out to the given type.
diagnoseIgnoredTypeAttrs(QualType type) const252 void diagnoseIgnoredTypeAttrs(QualType type) const {
253 for (auto *Attr : ignoredTypeAttrs)
254 diagnoseBadTypeAttribute(getSema(), *Attr, type);
255 }
256
257 /// Get an attributed type for the given attribute, and remember the Attr
258 /// object so that we can attach it to the AttributedTypeLoc.
getAttributedType(Attr * A,QualType ModifiedType,QualType EquivType)259 QualType getAttributedType(Attr *A, QualType ModifiedType,
260 QualType EquivType) {
261 QualType T =
262 sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType);
263 AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A});
264 AttrsForTypesSorted = false;
265 return T;
266 }
267
268 /// Completely replace the \c auto in \p TypeWithAuto by
269 /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if
270 /// necessary.
ReplaceAutoType(QualType TypeWithAuto,QualType Replacement)271 QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) {
272 QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement);
273 if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) {
274 // Attributed type still should be an attributed type after replacement.
275 auto *NewAttrTy = cast<AttributedType>(T.getTypePtr());
276 for (TypeAttrPair &A : AttrsForTypes) {
277 if (A.first == AttrTy)
278 A.first = NewAttrTy;
279 }
280 AttrsForTypesSorted = false;
281 }
282 return T;
283 }
284
285 /// Extract and remove the Attr* for a given attributed type.
takeAttrForAttributedType(const AttributedType * AT)286 const Attr *takeAttrForAttributedType(const AttributedType *AT) {
287 if (!AttrsForTypesSorted) {
288 llvm::stable_sort(AttrsForTypes, llvm::less_first());
289 AttrsForTypesSorted = true;
290 }
291
292 // FIXME: This is quadratic if we have lots of reuses of the same
293 // attributed type.
294 for (auto It = std::partition_point(
295 AttrsForTypes.begin(), AttrsForTypes.end(),
296 [=](const TypeAttrPair &A) { return A.first < AT; });
297 It != AttrsForTypes.end() && It->first == AT; ++It) {
298 if (It->second) {
299 const Attr *Result = It->second;
300 It->second = nullptr;
301 return Result;
302 }
303 }
304
305 llvm_unreachable("no Attr* for AttributedType*");
306 }
307
308 SourceLocation
getExpansionLocForMacroQualifiedType(const MacroQualifiedType * MQT) const309 getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const {
310 auto FoundLoc = LocsForMacros.find(MQT);
311 assert(FoundLoc != LocsForMacros.end() &&
312 "Unable to find macro expansion location for MacroQualifedType");
313 return FoundLoc->second;
314 }
315
setExpansionLocForMacroQualifiedType(const MacroQualifiedType * MQT,SourceLocation Loc)316 void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT,
317 SourceLocation Loc) {
318 LocsForMacros[MQT] = Loc;
319 }
320
setParsedNoDeref(bool parsed)321 void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; }
322
didParseNoDeref() const323 bool didParseNoDeref() const { return parsedNoDeref; }
324
~TypeProcessingState()325 ~TypeProcessingState() {
326 if (trivial) return;
327
328 restoreDeclSpecAttrs();
329 }
330
331 private:
getMutableDeclSpec() const332 DeclSpec &getMutableDeclSpec() const {
333 return const_cast<DeclSpec&>(declarator.getDeclSpec());
334 }
335
restoreDeclSpecAttrs()336 void restoreDeclSpecAttrs() {
337 assert(hasSavedAttrs);
338
339 getMutableDeclSpec().getAttributes().clearListOnly();
340 for (ParsedAttr *AL : savedAttrs)
341 getMutableDeclSpec().getAttributes().addAtEnd(AL);
342 }
343 };
344 } // end anonymous namespace
345
moveAttrFromListToList(ParsedAttr & attr,ParsedAttributesView & fromList,ParsedAttributesView & toList)346 static void moveAttrFromListToList(ParsedAttr &attr,
347 ParsedAttributesView &fromList,
348 ParsedAttributesView &toList) {
349 fromList.remove(&attr);
350 toList.addAtEnd(&attr);
351 }
352
353 /// The location of a type attribute.
354 enum TypeAttrLocation {
355 /// The attribute is in the decl-specifier-seq.
356 TAL_DeclSpec,
357 /// The attribute is part of a DeclaratorChunk.
358 TAL_DeclChunk,
359 /// The attribute is immediately after the declaration's name.
360 TAL_DeclName
361 };
362
363 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
364 TypeAttrLocation TAL, ParsedAttributesView &attrs);
365
366 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
367 QualType &type);
368
369 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
370 ParsedAttr &attr, QualType &type);
371
372 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
373 QualType &type);
374
375 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
376 ParsedAttr &attr, QualType &type);
377
handleObjCPointerTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)378 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
379 ParsedAttr &attr, QualType &type) {
380 if (attr.getKind() == ParsedAttr::AT_ObjCGC)
381 return handleObjCGCTypeAttr(state, attr, type);
382 assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership);
383 return handleObjCOwnershipTypeAttr(state, attr, type);
384 }
385
386 /// Given the index of a declarator chunk, check whether that chunk
387 /// directly specifies the return type of a function and, if so, find
388 /// an appropriate place for it.
389 ///
390 /// \param i - a notional index which the search will start
391 /// immediately inside
392 ///
393 /// \param onlyBlockPointers Whether we should only look into block
394 /// pointer types (vs. all pointer types).
maybeMovePastReturnType(Declarator & declarator,unsigned i,bool onlyBlockPointers)395 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
396 unsigned i,
397 bool onlyBlockPointers) {
398 assert(i <= declarator.getNumTypeObjects());
399
400 DeclaratorChunk *result = nullptr;
401
402 // First, look inwards past parens for a function declarator.
403 for (; i != 0; --i) {
404 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
405 switch (fnChunk.Kind) {
406 case DeclaratorChunk::Paren:
407 continue;
408
409 // If we find anything except a function, bail out.
410 case DeclaratorChunk::Pointer:
411 case DeclaratorChunk::BlockPointer:
412 case DeclaratorChunk::Array:
413 case DeclaratorChunk::Reference:
414 case DeclaratorChunk::MemberPointer:
415 case DeclaratorChunk::Pipe:
416 return result;
417
418 // If we do find a function declarator, scan inwards from that,
419 // looking for a (block-)pointer declarator.
420 case DeclaratorChunk::Function:
421 for (--i; i != 0; --i) {
422 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
423 switch (ptrChunk.Kind) {
424 case DeclaratorChunk::Paren:
425 case DeclaratorChunk::Array:
426 case DeclaratorChunk::Function:
427 case DeclaratorChunk::Reference:
428 case DeclaratorChunk::Pipe:
429 continue;
430
431 case DeclaratorChunk::MemberPointer:
432 case DeclaratorChunk::Pointer:
433 if (onlyBlockPointers)
434 continue;
435
436 LLVM_FALLTHROUGH;
437
438 case DeclaratorChunk::BlockPointer:
439 result = &ptrChunk;
440 goto continue_outer;
441 }
442 llvm_unreachable("bad declarator chunk kind");
443 }
444
445 // If we run out of declarators doing that, we're done.
446 return result;
447 }
448 llvm_unreachable("bad declarator chunk kind");
449
450 // Okay, reconsider from our new point.
451 continue_outer: ;
452 }
453
454 // Ran out of chunks, bail out.
455 return result;
456 }
457
458 /// Given that an objc_gc attribute was written somewhere on a
459 /// declaration *other* than on the declarator itself (for which, use
460 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
461 /// didn't apply in whatever position it was written in, try to move
462 /// it to a more appropriate position.
distributeObjCPointerTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType type)463 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
464 ParsedAttr &attr, QualType type) {
465 Declarator &declarator = state.getDeclarator();
466
467 // Move it to the outermost normal or block pointer declarator.
468 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
469 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
470 switch (chunk.Kind) {
471 case DeclaratorChunk::Pointer:
472 case DeclaratorChunk::BlockPointer: {
473 // But don't move an ARC ownership attribute to the return type
474 // of a block.
475 DeclaratorChunk *destChunk = nullptr;
476 if (state.isProcessingDeclSpec() &&
477 attr.getKind() == ParsedAttr::AT_ObjCOwnership)
478 destChunk = maybeMovePastReturnType(declarator, i - 1,
479 /*onlyBlockPointers=*/true);
480 if (!destChunk) destChunk = &chunk;
481
482 moveAttrFromListToList(attr, state.getCurrentAttributes(),
483 destChunk->getAttrs());
484 return;
485 }
486
487 case DeclaratorChunk::Paren:
488 case DeclaratorChunk::Array:
489 continue;
490
491 // We may be starting at the return type of a block.
492 case DeclaratorChunk::Function:
493 if (state.isProcessingDeclSpec() &&
494 attr.getKind() == ParsedAttr::AT_ObjCOwnership) {
495 if (DeclaratorChunk *dest = maybeMovePastReturnType(
496 declarator, i,
497 /*onlyBlockPointers=*/true)) {
498 moveAttrFromListToList(attr, state.getCurrentAttributes(),
499 dest->getAttrs());
500 return;
501 }
502 }
503 goto error;
504
505 // Don't walk through these.
506 case DeclaratorChunk::Reference:
507 case DeclaratorChunk::MemberPointer:
508 case DeclaratorChunk::Pipe:
509 goto error;
510 }
511 }
512 error:
513
514 diagnoseBadTypeAttribute(state.getSema(), attr, type);
515 }
516
517 /// Distribute an objc_gc type attribute that was written on the
518 /// declarator.
distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType)519 static void distributeObjCPointerTypeAttrFromDeclarator(
520 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) {
521 Declarator &declarator = state.getDeclarator();
522
523 // objc_gc goes on the innermost pointer to something that's not a
524 // pointer.
525 unsigned innermost = -1U;
526 bool considerDeclSpec = true;
527 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
528 DeclaratorChunk &chunk = declarator.getTypeObject(i);
529 switch (chunk.Kind) {
530 case DeclaratorChunk::Pointer:
531 case DeclaratorChunk::BlockPointer:
532 innermost = i;
533 continue;
534
535 case DeclaratorChunk::Reference:
536 case DeclaratorChunk::MemberPointer:
537 case DeclaratorChunk::Paren:
538 case DeclaratorChunk::Array:
539 case DeclaratorChunk::Pipe:
540 continue;
541
542 case DeclaratorChunk::Function:
543 considerDeclSpec = false;
544 goto done;
545 }
546 }
547 done:
548
549 // That might actually be the decl spec if we weren't blocked by
550 // anything in the declarator.
551 if (considerDeclSpec) {
552 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
553 // Splice the attribute into the decl spec. Prevents the
554 // attribute from being applied multiple times and gives
555 // the source-location-filler something to work with.
556 state.saveDeclSpecAttrs();
557 declarator.getMutableDeclSpec().getAttributes().takeOneFrom(
558 declarator.getAttributes(), &attr);
559 return;
560 }
561 }
562
563 // Otherwise, if we found an appropriate chunk, splice the attribute
564 // into it.
565 if (innermost != -1U) {
566 moveAttrFromListToList(attr, declarator.getAttributes(),
567 declarator.getTypeObject(innermost).getAttrs());
568 return;
569 }
570
571 // Otherwise, diagnose when we're done building the type.
572 declarator.getAttributes().remove(&attr);
573 state.addIgnoredTypeAttr(attr);
574 }
575
576 /// A function type attribute was written somewhere in a declaration
577 /// *other* than on the declarator itself or in the decl spec. Given
578 /// that it didn't apply in whatever position it was written in, try
579 /// to move it to a more appropriate position.
distributeFunctionTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType type)580 static void distributeFunctionTypeAttr(TypeProcessingState &state,
581 ParsedAttr &attr, QualType type) {
582 Declarator &declarator = state.getDeclarator();
583
584 // Try to push the attribute from the return type of a function to
585 // the function itself.
586 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
587 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
588 switch (chunk.Kind) {
589 case DeclaratorChunk::Function:
590 moveAttrFromListToList(attr, state.getCurrentAttributes(),
591 chunk.getAttrs());
592 return;
593
594 case DeclaratorChunk::Paren:
595 case DeclaratorChunk::Pointer:
596 case DeclaratorChunk::BlockPointer:
597 case DeclaratorChunk::Array:
598 case DeclaratorChunk::Reference:
599 case DeclaratorChunk::MemberPointer:
600 case DeclaratorChunk::Pipe:
601 continue;
602 }
603 }
604
605 diagnoseBadTypeAttribute(state.getSema(), attr, type);
606 }
607
608 /// Try to distribute a function type attribute to the innermost
609 /// function chunk or type. Returns true if the attribute was
610 /// distributed, false if no location was found.
distributeFunctionTypeAttrToInnermost(TypeProcessingState & state,ParsedAttr & attr,ParsedAttributesView & attrList,QualType & declSpecType)611 static bool distributeFunctionTypeAttrToInnermost(
612 TypeProcessingState &state, ParsedAttr &attr,
613 ParsedAttributesView &attrList, QualType &declSpecType) {
614 Declarator &declarator = state.getDeclarator();
615
616 // Put it on the innermost function chunk, if there is one.
617 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
618 DeclaratorChunk &chunk = declarator.getTypeObject(i);
619 if (chunk.Kind != DeclaratorChunk::Function) continue;
620
621 moveAttrFromListToList(attr, attrList, chunk.getAttrs());
622 return true;
623 }
624
625 return handleFunctionTypeAttr(state, attr, declSpecType);
626 }
627
628 /// A function type attribute was written in the decl spec. Try to
629 /// apply it somewhere.
distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType)630 static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
631 ParsedAttr &attr,
632 QualType &declSpecType) {
633 state.saveDeclSpecAttrs();
634
635 // C++11 attributes before the decl specifiers actually appertain to
636 // the declarators. Move them straight there. We don't support the
637 // 'put them wherever you like' semantics we allow for GNU attributes.
638 if (attr.isStandardAttributeSyntax()) {
639 moveAttrFromListToList(attr, state.getCurrentAttributes(),
640 state.getDeclarator().getAttributes());
641 return;
642 }
643
644 // Try to distribute to the innermost.
645 if (distributeFunctionTypeAttrToInnermost(
646 state, attr, state.getCurrentAttributes(), declSpecType))
647 return;
648
649 // If that failed, diagnose the bad attribute when the declarator is
650 // fully built.
651 state.addIgnoredTypeAttr(attr);
652 }
653
654 /// A function type attribute was written on the declarator. Try to
655 /// apply it somewhere.
distributeFunctionTypeAttrFromDeclarator(TypeProcessingState & state,ParsedAttr & attr,QualType & declSpecType)656 static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
657 ParsedAttr &attr,
658 QualType &declSpecType) {
659 Declarator &declarator = state.getDeclarator();
660
661 // Try to distribute to the innermost.
662 if (distributeFunctionTypeAttrToInnermost(
663 state, attr, declarator.getAttributes(), declSpecType))
664 return;
665
666 // If that failed, diagnose the bad attribute when the declarator is
667 // fully built.
668 declarator.getAttributes().remove(&attr);
669 state.addIgnoredTypeAttr(attr);
670 }
671
672 /// Given that there are attributes written on the declarator
673 /// itself, try to distribute any type attributes to the appropriate
674 /// declarator chunk.
675 ///
676 /// These are attributes like the following:
677 /// int f ATTR;
678 /// int (f ATTR)();
679 /// but not necessarily this:
680 /// int f() ATTR;
distributeTypeAttrsFromDeclarator(TypeProcessingState & state,QualType & declSpecType)681 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
682 QualType &declSpecType) {
683 // Collect all the type attributes from the declarator itself.
684 assert(!state.getDeclarator().getAttributes().empty() &&
685 "declarator has no attrs!");
686 // The called functions in this loop actually remove things from the current
687 // list, so iterating over the existing list isn't possible. Instead, make a
688 // non-owning copy and iterate over that.
689 ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()};
690 for (ParsedAttr &attr : AttrsCopy) {
691 // Do not distribute [[]] attributes. They have strict rules for what
692 // they appertain to.
693 if (attr.isStandardAttributeSyntax())
694 continue;
695
696 switch (attr.getKind()) {
697 OBJC_POINTER_TYPE_ATTRS_CASELIST:
698 distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType);
699 break;
700
701 FUNCTION_TYPE_ATTRS_CASELIST:
702 distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType);
703 break;
704
705 MS_TYPE_ATTRS_CASELIST:
706 // Microsoft type attributes cannot go after the declarator-id.
707 continue;
708
709 NULLABILITY_TYPE_ATTRS_CASELIST:
710 // Nullability specifiers cannot go after the declarator-id.
711
712 // Objective-C __kindof does not get distributed.
713 case ParsedAttr::AT_ObjCKindOf:
714 continue;
715
716 default:
717 break;
718 }
719 }
720 }
721
722 /// Add a synthetic '()' to a block-literal declarator if it is
723 /// required, given the return type.
maybeSynthesizeBlockSignature(TypeProcessingState & state,QualType declSpecType)724 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
725 QualType declSpecType) {
726 Declarator &declarator = state.getDeclarator();
727
728 // First, check whether the declarator would produce a function,
729 // i.e. whether the innermost semantic chunk is a function.
730 if (declarator.isFunctionDeclarator()) {
731 // If so, make that declarator a prototyped declarator.
732 declarator.getFunctionTypeInfo().hasPrototype = true;
733 return;
734 }
735
736 // If there are any type objects, the type as written won't name a
737 // function, regardless of the decl spec type. This is because a
738 // block signature declarator is always an abstract-declarator, and
739 // abstract-declarators can't just be parentheses chunks. Therefore
740 // we need to build a function chunk unless there are no type
741 // objects and the decl spec type is a function.
742 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
743 return;
744
745 // Note that there *are* cases with invalid declarators where
746 // declarators consist solely of parentheses. In general, these
747 // occur only in failed efforts to make function declarators, so
748 // faking up the function chunk is still the right thing to do.
749
750 // Otherwise, we need to fake up a function declarator.
751 SourceLocation loc = declarator.getBeginLoc();
752
753 // ...and *prepend* it to the declarator.
754 SourceLocation NoLoc;
755 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
756 /*HasProto=*/true,
757 /*IsAmbiguous=*/false,
758 /*LParenLoc=*/NoLoc,
759 /*ArgInfo=*/nullptr,
760 /*NumParams=*/0,
761 /*EllipsisLoc=*/NoLoc,
762 /*RParenLoc=*/NoLoc,
763 /*RefQualifierIsLvalueRef=*/true,
764 /*RefQualifierLoc=*/NoLoc,
765 /*MutableLoc=*/NoLoc, EST_None,
766 /*ESpecRange=*/SourceRange(),
767 /*Exceptions=*/nullptr,
768 /*ExceptionRanges=*/nullptr,
769 /*NumExceptions=*/0,
770 /*NoexceptExpr=*/nullptr,
771 /*ExceptionSpecTokens=*/nullptr,
772 /*DeclsInPrototype=*/None, loc, loc, declarator));
773
774 // For consistency, make sure the state still has us as processing
775 // the decl spec.
776 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
777 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
778 }
779
diagnoseAndRemoveTypeQualifiers(Sema & S,const DeclSpec & DS,unsigned & TypeQuals,QualType TypeSoFar,unsigned RemoveTQs,unsigned DiagID)780 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
781 unsigned &TypeQuals,
782 QualType TypeSoFar,
783 unsigned RemoveTQs,
784 unsigned DiagID) {
785 // If this occurs outside a template instantiation, warn the user about
786 // it; they probably didn't mean to specify a redundant qualifier.
787 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
788 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
789 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
790 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
791 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
792 if (!(RemoveTQs & Qual.first))
793 continue;
794
795 if (!S.inTemplateInstantiation()) {
796 if (TypeQuals & Qual.first)
797 S.Diag(Qual.second, DiagID)
798 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
799 << FixItHint::CreateRemoval(Qual.second);
800 }
801
802 TypeQuals &= ~Qual.first;
803 }
804 }
805
806 /// Return true if this is omitted block return type. Also check type
807 /// attributes and type qualifiers when returning true.
checkOmittedBlockReturnType(Sema & S,Declarator & declarator,QualType Result)808 static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
809 QualType Result) {
810 if (!isOmittedBlockReturnType(declarator))
811 return false;
812
813 // Warn if we see type attributes for omitted return type on a block literal.
814 SmallVector<ParsedAttr *, 2> ToBeRemoved;
815 for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
816 if (AL.isInvalid() || !AL.isTypeAttr())
817 continue;
818 S.Diag(AL.getLoc(),
819 diag::warn_block_literal_attributes_on_omitted_return_type)
820 << AL;
821 ToBeRemoved.push_back(&AL);
822 }
823 // Remove bad attributes from the list.
824 for (ParsedAttr *AL : ToBeRemoved)
825 declarator.getMutableDeclSpec().getAttributes().remove(AL);
826
827 // Warn if we see type qualifiers for omitted return type on a block literal.
828 const DeclSpec &DS = declarator.getDeclSpec();
829 unsigned TypeQuals = DS.getTypeQualifiers();
830 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
831 diag::warn_block_literal_qualifiers_on_omitted_return_type);
832 declarator.getMutableDeclSpec().ClearTypeQualifiers();
833
834 return true;
835 }
836
837 /// Apply Objective-C type arguments to the given type.
applyObjCTypeArgs(Sema & S,SourceLocation loc,QualType type,ArrayRef<TypeSourceInfo * > typeArgs,SourceRange typeArgsRange,bool failOnError=false)838 static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
839 ArrayRef<TypeSourceInfo *> typeArgs,
840 SourceRange typeArgsRange,
841 bool failOnError = false) {
842 // We can only apply type arguments to an Objective-C class type.
843 const auto *objcObjectType = type->getAs<ObjCObjectType>();
844 if (!objcObjectType || !objcObjectType->getInterface()) {
845 S.Diag(loc, diag::err_objc_type_args_non_class)
846 << type
847 << typeArgsRange;
848
849 if (failOnError)
850 return QualType();
851 return type;
852 }
853
854 // The class type must be parameterized.
855 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
856 ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
857 if (!typeParams) {
858 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
859 << objcClass->getDeclName()
860 << FixItHint::CreateRemoval(typeArgsRange);
861
862 if (failOnError)
863 return QualType();
864
865 return type;
866 }
867
868 // The type must not already be specialized.
869 if (objcObjectType->isSpecialized()) {
870 S.Diag(loc, diag::err_objc_type_args_specialized_class)
871 << type
872 << FixItHint::CreateRemoval(typeArgsRange);
873
874 if (failOnError)
875 return QualType();
876
877 return type;
878 }
879
880 // Check the type arguments.
881 SmallVector<QualType, 4> finalTypeArgs;
882 unsigned numTypeParams = typeParams->size();
883 bool anyPackExpansions = false;
884 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
885 TypeSourceInfo *typeArgInfo = typeArgs[i];
886 QualType typeArg = typeArgInfo->getType();
887
888 // Type arguments cannot have explicit qualifiers or nullability.
889 // We ignore indirect sources of these, e.g. behind typedefs or
890 // template arguments.
891 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
892 bool diagnosed = false;
893 SourceRange rangeToRemove;
894 if (auto attr = qual.getAs<AttributedTypeLoc>()) {
895 rangeToRemove = attr.getLocalSourceRange();
896 if (attr.getTypePtr()->getImmediateNullability()) {
897 typeArg = attr.getTypePtr()->getModifiedType();
898 S.Diag(attr.getBeginLoc(),
899 diag::err_objc_type_arg_explicit_nullability)
900 << typeArg << FixItHint::CreateRemoval(rangeToRemove);
901 diagnosed = true;
902 }
903 }
904
905 if (!diagnosed) {
906 S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
907 << typeArg << typeArg.getQualifiers().getAsString()
908 << FixItHint::CreateRemoval(rangeToRemove);
909 }
910 }
911
912 // Remove qualifiers even if they're non-local.
913 typeArg = typeArg.getUnqualifiedType();
914
915 finalTypeArgs.push_back(typeArg);
916
917 if (typeArg->getAs<PackExpansionType>())
918 anyPackExpansions = true;
919
920 // Find the corresponding type parameter, if there is one.
921 ObjCTypeParamDecl *typeParam = nullptr;
922 if (!anyPackExpansions) {
923 if (i < numTypeParams) {
924 typeParam = typeParams->begin()[i];
925 } else {
926 // Too many arguments.
927 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
928 << false
929 << objcClass->getDeclName()
930 << (unsigned)typeArgs.size()
931 << numTypeParams;
932 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
933 << objcClass;
934
935 if (failOnError)
936 return QualType();
937
938 return type;
939 }
940 }
941
942 // Objective-C object pointer types must be substitutable for the bounds.
943 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
944 // If we don't have a type parameter to match against, assume
945 // everything is fine. There was a prior pack expansion that
946 // means we won't be able to match anything.
947 if (!typeParam) {
948 assert(anyPackExpansions && "Too many arguments?");
949 continue;
950 }
951
952 // Retrieve the bound.
953 QualType bound = typeParam->getUnderlyingType();
954 const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
955
956 // Determine whether the type argument is substitutable for the bound.
957 if (typeArgObjC->isObjCIdType()) {
958 // When the type argument is 'id', the only acceptable type
959 // parameter bound is 'id'.
960 if (boundObjC->isObjCIdType())
961 continue;
962 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
963 // Otherwise, we follow the assignability rules.
964 continue;
965 }
966
967 // Diagnose the mismatch.
968 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
969 diag::err_objc_type_arg_does_not_match_bound)
970 << typeArg << bound << typeParam->getDeclName();
971 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
972 << typeParam->getDeclName();
973
974 if (failOnError)
975 return QualType();
976
977 return type;
978 }
979
980 // Block pointer types are permitted for unqualified 'id' bounds.
981 if (typeArg->isBlockPointerType()) {
982 // If we don't have a type parameter to match against, assume
983 // everything is fine. There was a prior pack expansion that
984 // means we won't be able to match anything.
985 if (!typeParam) {
986 assert(anyPackExpansions && "Too many arguments?");
987 continue;
988 }
989
990 // Retrieve the bound.
991 QualType bound = typeParam->getUnderlyingType();
992 if (bound->isBlockCompatibleObjCPointerType(S.Context))
993 continue;
994
995 // Diagnose the mismatch.
996 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
997 diag::err_objc_type_arg_does_not_match_bound)
998 << typeArg << bound << typeParam->getDeclName();
999 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
1000 << typeParam->getDeclName();
1001
1002 if (failOnError)
1003 return QualType();
1004
1005 return type;
1006 }
1007
1008 // Dependent types will be checked at instantiation time.
1009 if (typeArg->isDependentType()) {
1010 continue;
1011 }
1012
1013 // Diagnose non-id-compatible type arguments.
1014 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
1015 diag::err_objc_type_arg_not_id_compatible)
1016 << typeArg << typeArgInfo->getTypeLoc().getSourceRange();
1017
1018 if (failOnError)
1019 return QualType();
1020
1021 return type;
1022 }
1023
1024 // Make sure we didn't have the wrong number of arguments.
1025 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
1026 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
1027 << (typeArgs.size() < typeParams->size())
1028 << objcClass->getDeclName()
1029 << (unsigned)finalTypeArgs.size()
1030 << (unsigned)numTypeParams;
1031 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
1032 << objcClass;
1033
1034 if (failOnError)
1035 return QualType();
1036
1037 return type;
1038 }
1039
1040 // Success. Form the specialized type.
1041 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1042 }
1043
BuildObjCTypeParamType(const ObjCTypeParamDecl * Decl,SourceLocation ProtocolLAngleLoc,ArrayRef<ObjCProtocolDecl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc,bool FailOnError)1044 QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
1045 SourceLocation ProtocolLAngleLoc,
1046 ArrayRef<ObjCProtocolDecl *> Protocols,
1047 ArrayRef<SourceLocation> ProtocolLocs,
1048 SourceLocation ProtocolRAngleLoc,
1049 bool FailOnError) {
1050 QualType Result = QualType(Decl->getTypeForDecl(), 0);
1051 if (!Protocols.empty()) {
1052 bool HasError;
1053 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1054 HasError);
1055 if (HasError) {
1056 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
1057 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1058 if (FailOnError) Result = QualType();
1059 }
1060 if (FailOnError && Result.isNull())
1061 return QualType();
1062 }
1063
1064 return Result;
1065 }
1066
BuildObjCObjectType(QualType BaseType,SourceLocation Loc,SourceLocation TypeArgsLAngleLoc,ArrayRef<TypeSourceInfo * > TypeArgs,SourceLocation TypeArgsRAngleLoc,SourceLocation ProtocolLAngleLoc,ArrayRef<ObjCProtocolDecl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc,bool FailOnError)1067 QualType Sema::BuildObjCObjectType(QualType BaseType,
1068 SourceLocation Loc,
1069 SourceLocation TypeArgsLAngleLoc,
1070 ArrayRef<TypeSourceInfo *> TypeArgs,
1071 SourceLocation TypeArgsRAngleLoc,
1072 SourceLocation ProtocolLAngleLoc,
1073 ArrayRef<ObjCProtocolDecl *> Protocols,
1074 ArrayRef<SourceLocation> ProtocolLocs,
1075 SourceLocation ProtocolRAngleLoc,
1076 bool FailOnError) {
1077 QualType Result = BaseType;
1078 if (!TypeArgs.empty()) {
1079 Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
1080 SourceRange(TypeArgsLAngleLoc,
1081 TypeArgsRAngleLoc),
1082 FailOnError);
1083 if (FailOnError && Result.isNull())
1084 return QualType();
1085 }
1086
1087 if (!Protocols.empty()) {
1088 bool HasError;
1089 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1090 HasError);
1091 if (HasError) {
1092 Diag(Loc, diag::err_invalid_protocol_qualifiers)
1093 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1094 if (FailOnError) Result = QualType();
1095 }
1096 if (FailOnError && Result.isNull())
1097 return QualType();
1098 }
1099
1100 return Result;
1101 }
1102
actOnObjCProtocolQualifierType(SourceLocation lAngleLoc,ArrayRef<Decl * > protocols,ArrayRef<SourceLocation> protocolLocs,SourceLocation rAngleLoc)1103 TypeResult Sema::actOnObjCProtocolQualifierType(
1104 SourceLocation lAngleLoc,
1105 ArrayRef<Decl *> protocols,
1106 ArrayRef<SourceLocation> protocolLocs,
1107 SourceLocation rAngleLoc) {
1108 // Form id<protocol-list>.
1109 QualType Result = Context.getObjCObjectType(
1110 Context.ObjCBuiltinIdTy, { },
1111 llvm::makeArrayRef(
1112 (ObjCProtocolDecl * const *)protocols.data(),
1113 protocols.size()),
1114 false);
1115 Result = Context.getObjCObjectPointerType(Result);
1116
1117 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1118 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1119
1120 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
1121 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
1122
1123 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
1124 .castAs<ObjCObjectTypeLoc>();
1125 ObjCObjectTL.setHasBaseTypeAsWritten(false);
1126 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
1127
1128 // No type arguments.
1129 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1130 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1131
1132 // Fill in protocol qualifiers.
1133 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
1134 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
1135 for (unsigned i = 0, n = protocols.size(); i != n; ++i)
1136 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
1137
1138 // We're done. Return the completed type to the parser.
1139 return CreateParsedType(Result, ResultTInfo);
1140 }
1141
actOnObjCTypeArgsAndProtocolQualifiers(Scope * S,SourceLocation Loc,ParsedType BaseType,SourceLocation TypeArgsLAngleLoc,ArrayRef<ParsedType> TypeArgs,SourceLocation TypeArgsRAngleLoc,SourceLocation ProtocolLAngleLoc,ArrayRef<Decl * > Protocols,ArrayRef<SourceLocation> ProtocolLocs,SourceLocation ProtocolRAngleLoc)1142 TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
1143 Scope *S,
1144 SourceLocation Loc,
1145 ParsedType BaseType,
1146 SourceLocation TypeArgsLAngleLoc,
1147 ArrayRef<ParsedType> TypeArgs,
1148 SourceLocation TypeArgsRAngleLoc,
1149 SourceLocation ProtocolLAngleLoc,
1150 ArrayRef<Decl *> Protocols,
1151 ArrayRef<SourceLocation> ProtocolLocs,
1152 SourceLocation ProtocolRAngleLoc) {
1153 TypeSourceInfo *BaseTypeInfo = nullptr;
1154 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
1155 if (T.isNull())
1156 return true;
1157
1158 // Handle missing type-source info.
1159 if (!BaseTypeInfo)
1160 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
1161
1162 // Extract type arguments.
1163 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
1164 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
1165 TypeSourceInfo *TypeArgInfo = nullptr;
1166 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
1167 if (TypeArg.isNull()) {
1168 ActualTypeArgInfos.clear();
1169 break;
1170 }
1171
1172 assert(TypeArgInfo && "No type source info?");
1173 ActualTypeArgInfos.push_back(TypeArgInfo);
1174 }
1175
1176 // Build the object type.
1177 QualType Result = BuildObjCObjectType(
1178 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
1179 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
1180 ProtocolLAngleLoc,
1181 llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
1182 Protocols.size()),
1183 ProtocolLocs, ProtocolRAngleLoc,
1184 /*FailOnError=*/false);
1185
1186 if (Result == T)
1187 return BaseType;
1188
1189 // Create source information for this type.
1190 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1191 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1192
1193 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
1194 // object pointer type. Fill in source information for it.
1195 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
1196 // The '*' is implicit.
1197 ObjCObjectPointerTL.setStarLoc(SourceLocation());
1198 ResultTL = ObjCObjectPointerTL.getPointeeLoc();
1199 }
1200
1201 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
1202 // Protocol qualifier information.
1203 if (OTPTL.getNumProtocols() > 0) {
1204 assert(OTPTL.getNumProtocols() == Protocols.size());
1205 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1206 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1207 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1208 OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
1209 }
1210
1211 // We're done. Return the completed type to the parser.
1212 return CreateParsedType(Result, ResultTInfo);
1213 }
1214
1215 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
1216
1217 // Type argument information.
1218 if (ObjCObjectTL.getNumTypeArgs() > 0) {
1219 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
1220 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
1221 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
1222 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
1223 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
1224 } else {
1225 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1226 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1227 }
1228
1229 // Protocol qualifier information.
1230 if (ObjCObjectTL.getNumProtocols() > 0) {
1231 assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
1232 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1233 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1234 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1235 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
1236 } else {
1237 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
1238 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
1239 }
1240
1241 // Base type.
1242 ObjCObjectTL.setHasBaseTypeAsWritten(true);
1243 if (ObjCObjectTL.getType() == T)
1244 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
1245 else
1246 ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
1247
1248 // We're done. Return the completed type to the parser.
1249 return CreateParsedType(Result, ResultTInfo);
1250 }
1251
1252 static OpenCLAccessAttr::Spelling
getImageAccess(const ParsedAttributesView & Attrs)1253 getImageAccess(const ParsedAttributesView &Attrs) {
1254 for (const ParsedAttr &AL : Attrs)
1255 if (AL.getKind() == ParsedAttr::AT_OpenCLAccess)
1256 return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling());
1257 return OpenCLAccessAttr::Keyword_read_only;
1258 }
1259
1260 /// Convert the specified declspec to the appropriate type
1261 /// object.
1262 /// \param state Specifies the declarator containing the declaration specifier
1263 /// to be converted, along with other associated processing state.
1264 /// \returns The type described by the declaration specifiers. This function
1265 /// never returns null.
ConvertDeclSpecToType(TypeProcessingState & state)1266 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
1267 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
1268 // checking.
1269
1270 Sema &S = state.getSema();
1271 Declarator &declarator = state.getDeclarator();
1272 DeclSpec &DS = declarator.getMutableDeclSpec();
1273 SourceLocation DeclLoc = declarator.getIdentifierLoc();
1274 if (DeclLoc.isInvalid())
1275 DeclLoc = DS.getBeginLoc();
1276
1277 ASTContext &Context = S.Context;
1278
1279 QualType Result;
1280 switch (DS.getTypeSpecType()) {
1281 case DeclSpec::TST_void:
1282 Result = Context.VoidTy;
1283 break;
1284 case DeclSpec::TST_char:
1285 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1286 Result = Context.CharTy;
1287 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed)
1288 Result = Context.SignedCharTy;
1289 else {
1290 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1291 "Unknown TSS value");
1292 Result = Context.UnsignedCharTy;
1293 }
1294 break;
1295 case DeclSpec::TST_wchar:
1296 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1297 Result = Context.WCharTy;
1298 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed) {
1299 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1300 << DS.getSpecifierName(DS.getTypeSpecType(),
1301 Context.getPrintingPolicy());
1302 Result = Context.getSignedWCharType();
1303 } else {
1304 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1305 "Unknown TSS value");
1306 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1307 << DS.getSpecifierName(DS.getTypeSpecType(),
1308 Context.getPrintingPolicy());
1309 Result = Context.getUnsignedWCharType();
1310 }
1311 break;
1312 case DeclSpec::TST_char8:
1313 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1314 "Unknown TSS value");
1315 Result = Context.Char8Ty;
1316 break;
1317 case DeclSpec::TST_char16:
1318 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1319 "Unknown TSS value");
1320 Result = Context.Char16Ty;
1321 break;
1322 case DeclSpec::TST_char32:
1323 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1324 "Unknown TSS value");
1325 Result = Context.Char32Ty;
1326 break;
1327 case DeclSpec::TST_unspecified:
1328 // If this is a missing declspec in a block literal return context, then it
1329 // is inferred from the return statements inside the block.
1330 // The declspec is always missing in a lambda expr context; it is either
1331 // specified with a trailing return type or inferred.
1332 if (S.getLangOpts().CPlusPlus14 &&
1333 declarator.getContext() == DeclaratorContext::LambdaExpr) {
1334 // In C++1y, a lambda's implicit return type is 'auto'.
1335 Result = Context.getAutoDeductType();
1336 break;
1337 } else if (declarator.getContext() == DeclaratorContext::LambdaExpr ||
1338 checkOmittedBlockReturnType(S, declarator,
1339 Context.DependentTy)) {
1340 Result = Context.DependentTy;
1341 break;
1342 }
1343
1344 // Unspecified typespec defaults to int in C90. However, the C90 grammar
1345 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
1346 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
1347 // Note that the one exception to this is function definitions, which are
1348 // allowed to be completely missing a declspec. This is handled in the
1349 // parser already though by it pretending to have seen an 'int' in this
1350 // case.
1351 if (S.getLangOpts().ImplicitInt) {
1352 // In C89 mode, we only warn if there is a completely missing declspec
1353 // when one is not allowed.
1354 if (DS.isEmpty()) {
1355 S.Diag(DeclLoc, diag::ext_missing_declspec)
1356 << DS.getSourceRange()
1357 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1358 }
1359 } else if (!DS.hasTypeSpecifier()) {
1360 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
1361 // "At least one type specifier shall be given in the declaration
1362 // specifiers in each declaration, and in the specifier-qualifier list in
1363 // each struct declaration and type name."
1364 if (S.getLangOpts().CPlusPlus && !DS.isTypeSpecPipe()) {
1365 S.Diag(DeclLoc, diag::err_missing_type_specifier)
1366 << DS.getSourceRange();
1367
1368 // When this occurs in C++ code, often something is very broken with the
1369 // value being declared, poison it as invalid so we don't get chains of
1370 // errors.
1371 declarator.setInvalidType(true);
1372 } else if (S.getLangOpts().getOpenCLCompatibleVersion() >= 200 &&
1373 DS.isTypeSpecPipe()) {
1374 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
1375 << DS.getSourceRange();
1376 declarator.setInvalidType(true);
1377 } else {
1378 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
1379 << DS.getSourceRange();
1380 }
1381 }
1382
1383 LLVM_FALLTHROUGH;
1384 case DeclSpec::TST_int: {
1385 if (DS.getTypeSpecSign() != TypeSpecifierSign::Unsigned) {
1386 switch (DS.getTypeSpecWidth()) {
1387 case TypeSpecifierWidth::Unspecified:
1388 Result = Context.IntTy;
1389 break;
1390 case TypeSpecifierWidth::Short:
1391 Result = Context.ShortTy;
1392 break;
1393 case TypeSpecifierWidth::Long:
1394 Result = Context.LongTy;
1395 break;
1396 case TypeSpecifierWidth::LongLong:
1397 Result = Context.LongLongTy;
1398
1399 // 'long long' is a C99 or C++11 feature.
1400 if (!S.getLangOpts().C99) {
1401 if (S.getLangOpts().CPlusPlus)
1402 S.Diag(DS.getTypeSpecWidthLoc(),
1403 S.getLangOpts().CPlusPlus11 ?
1404 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1405 else
1406 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1407 }
1408 break;
1409 }
1410 } else {
1411 switch (DS.getTypeSpecWidth()) {
1412 case TypeSpecifierWidth::Unspecified:
1413 Result = Context.UnsignedIntTy;
1414 break;
1415 case TypeSpecifierWidth::Short:
1416 Result = Context.UnsignedShortTy;
1417 break;
1418 case TypeSpecifierWidth::Long:
1419 Result = Context.UnsignedLongTy;
1420 break;
1421 case TypeSpecifierWidth::LongLong:
1422 Result = Context.UnsignedLongLongTy;
1423
1424 // 'long long' is a C99 or C++11 feature.
1425 if (!S.getLangOpts().C99) {
1426 if (S.getLangOpts().CPlusPlus)
1427 S.Diag(DS.getTypeSpecWidthLoc(),
1428 S.getLangOpts().CPlusPlus11 ?
1429 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1430 else
1431 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1432 }
1433 break;
1434 }
1435 }
1436 break;
1437 }
1438 case DeclSpec::TST_extint: {
1439 if (!S.Context.getTargetInfo().hasExtIntType())
1440 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1441 << "_ExtInt";
1442 Result =
1443 S.BuildExtIntType(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned,
1444 DS.getRepAsExpr(), DS.getBeginLoc());
1445 if (Result.isNull()) {
1446 Result = Context.IntTy;
1447 declarator.setInvalidType(true);
1448 }
1449 break;
1450 }
1451 case DeclSpec::TST_accum: {
1452 switch (DS.getTypeSpecWidth()) {
1453 case TypeSpecifierWidth::Short:
1454 Result = Context.ShortAccumTy;
1455 break;
1456 case TypeSpecifierWidth::Unspecified:
1457 Result = Context.AccumTy;
1458 break;
1459 case TypeSpecifierWidth::Long:
1460 Result = Context.LongAccumTy;
1461 break;
1462 case TypeSpecifierWidth::LongLong:
1463 llvm_unreachable("Unable to specify long long as _Accum width");
1464 }
1465
1466 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1467 Result = Context.getCorrespondingUnsignedType(Result);
1468
1469 if (DS.isTypeSpecSat())
1470 Result = Context.getCorrespondingSaturatedType(Result);
1471
1472 break;
1473 }
1474 case DeclSpec::TST_fract: {
1475 switch (DS.getTypeSpecWidth()) {
1476 case TypeSpecifierWidth::Short:
1477 Result = Context.ShortFractTy;
1478 break;
1479 case TypeSpecifierWidth::Unspecified:
1480 Result = Context.FractTy;
1481 break;
1482 case TypeSpecifierWidth::Long:
1483 Result = Context.LongFractTy;
1484 break;
1485 case TypeSpecifierWidth::LongLong:
1486 llvm_unreachable("Unable to specify long long as _Fract width");
1487 }
1488
1489 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1490 Result = Context.getCorrespondingUnsignedType(Result);
1491
1492 if (DS.isTypeSpecSat())
1493 Result = Context.getCorrespondingSaturatedType(Result);
1494
1495 break;
1496 }
1497 case DeclSpec::TST_int128:
1498 if (!S.Context.getTargetInfo().hasInt128Type() &&
1499 !S.getLangOpts().SYCLIsDevice &&
1500 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1501 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1502 << "__int128";
1503 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1504 Result = Context.UnsignedInt128Ty;
1505 else
1506 Result = Context.Int128Ty;
1507 break;
1508 case DeclSpec::TST_float16:
1509 // CUDA host and device may have different _Float16 support, therefore
1510 // do not diagnose _Float16 usage to avoid false alarm.
1511 // ToDo: more precise diagnostics for CUDA.
1512 if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA &&
1513 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1514 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1515 << "_Float16";
1516 Result = Context.Float16Ty;
1517 break;
1518 case DeclSpec::TST_half: Result = Context.HalfTy; break;
1519 case DeclSpec::TST_BFloat16:
1520 if (!S.Context.getTargetInfo().hasBFloat16Type())
1521 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1522 << "__bf16";
1523 Result = Context.BFloat16Ty;
1524 break;
1525 case DeclSpec::TST_float: Result = Context.FloatTy; break;
1526 case DeclSpec::TST_double:
1527 if (DS.getTypeSpecWidth() == TypeSpecifierWidth::Long)
1528 Result = Context.LongDoubleTy;
1529 else
1530 Result = Context.DoubleTy;
1531 if (S.getLangOpts().OpenCL) {
1532 if (!S.getOpenCLOptions().isSupported("cl_khr_fp64", S.getLangOpts()))
1533 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1534 << 0 << Result
1535 << (S.getLangOpts().getOpenCLCompatibleVersion() == 300
1536 ? "cl_khr_fp64 and __opencl_c_fp64"
1537 : "cl_khr_fp64");
1538 else if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp64", S.getLangOpts()))
1539 S.Diag(DS.getTypeSpecTypeLoc(), diag::ext_opencl_double_without_pragma);
1540 }
1541 break;
1542 case DeclSpec::TST_float128:
1543 if (!S.Context.getTargetInfo().hasFloat128Type() &&
1544 !S.getLangOpts().SYCLIsDevice &&
1545 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1546 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1547 << "__float128";
1548 Result = Context.Float128Ty;
1549 break;
1550 case DeclSpec::TST_ibm128:
1551 if (!S.Context.getTargetInfo().hasIbm128Type() &&
1552 !S.getLangOpts().SYCLIsDevice &&
1553 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1554 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__ibm128";
1555 Result = Context.Ibm128Ty;
1556 break;
1557 case DeclSpec::TST_bool:
1558 Result = Context.BoolTy; // _Bool or bool
1559 break;
1560 case DeclSpec::TST_decimal32: // _Decimal32
1561 case DeclSpec::TST_decimal64: // _Decimal64
1562 case DeclSpec::TST_decimal128: // _Decimal128
1563 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
1564 Result = Context.IntTy;
1565 declarator.setInvalidType(true);
1566 break;
1567 case DeclSpec::TST_class:
1568 case DeclSpec::TST_enum:
1569 case DeclSpec::TST_union:
1570 case DeclSpec::TST_struct:
1571 case DeclSpec::TST_interface: {
1572 TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl());
1573 if (!D) {
1574 // This can happen in C++ with ambiguous lookups.
1575 Result = Context.IntTy;
1576 declarator.setInvalidType(true);
1577 break;
1578 }
1579
1580 // If the type is deprecated or unavailable, diagnose it.
1581 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
1582
1583 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1584 DS.getTypeSpecComplex() == 0 &&
1585 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1586 "No qualifiers on tag names!");
1587
1588 // TypeQuals handled by caller.
1589 Result = Context.getTypeDeclType(D);
1590
1591 // In both C and C++, make an ElaboratedType.
1592 ElaboratedTypeKeyword Keyword
1593 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
1594 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result,
1595 DS.isTypeSpecOwned() ? D : nullptr);
1596 break;
1597 }
1598 case DeclSpec::TST_typename: {
1599 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1600 DS.getTypeSpecComplex() == 0 &&
1601 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1602 "Can't handle qualifiers on typedef names yet!");
1603 Result = S.GetTypeFromParser(DS.getRepAsType());
1604 if (Result.isNull()) {
1605 declarator.setInvalidType(true);
1606 }
1607
1608 // TypeQuals handled by caller.
1609 break;
1610 }
1611 case DeclSpec::TST_typeofType:
1612 // FIXME: Preserve type source info.
1613 Result = S.GetTypeFromParser(DS.getRepAsType());
1614 assert(!Result.isNull() && "Didn't get a type for typeof?");
1615 if (!Result->isDependentType())
1616 if (const TagType *TT = Result->getAs<TagType>())
1617 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1618 // TypeQuals handled by caller.
1619 Result = Context.getTypeOfType(Result);
1620 break;
1621 case DeclSpec::TST_typeofExpr: {
1622 Expr *E = DS.getRepAsExpr();
1623 assert(E && "Didn't get an expression for typeof?");
1624 // TypeQuals handled by caller.
1625 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
1626 if (Result.isNull()) {
1627 Result = Context.IntTy;
1628 declarator.setInvalidType(true);
1629 }
1630 break;
1631 }
1632 case DeclSpec::TST_decltype: {
1633 Expr *E = DS.getRepAsExpr();
1634 assert(E && "Didn't get an expression for decltype?");
1635 // TypeQuals handled by caller.
1636 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
1637 if (Result.isNull()) {
1638 Result = Context.IntTy;
1639 declarator.setInvalidType(true);
1640 }
1641 break;
1642 }
1643 case DeclSpec::TST_underlyingType:
1644 Result = S.GetTypeFromParser(DS.getRepAsType());
1645 assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
1646 Result = S.BuildUnaryTransformType(Result,
1647 UnaryTransformType::EnumUnderlyingType,
1648 DS.getTypeSpecTypeLoc());
1649 if (Result.isNull()) {
1650 Result = Context.IntTy;
1651 declarator.setInvalidType(true);
1652 }
1653 break;
1654
1655 case DeclSpec::TST_auto:
1656 case DeclSpec::TST_decltype_auto: {
1657 auto AutoKW = DS.getTypeSpecType() == DeclSpec::TST_decltype_auto
1658 ? AutoTypeKeyword::DecltypeAuto
1659 : AutoTypeKeyword::Auto;
1660
1661 ConceptDecl *TypeConstraintConcept = nullptr;
1662 llvm::SmallVector<TemplateArgument, 8> TemplateArgs;
1663 if (DS.isConstrainedAuto()) {
1664 if (TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId()) {
1665 TypeConstraintConcept =
1666 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl());
1667 TemplateArgumentListInfo TemplateArgsInfo;
1668 TemplateArgsInfo.setLAngleLoc(TemplateId->LAngleLoc);
1669 TemplateArgsInfo.setRAngleLoc(TemplateId->RAngleLoc);
1670 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1671 TemplateId->NumArgs);
1672 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
1673 for (const auto &ArgLoc : TemplateArgsInfo.arguments())
1674 TemplateArgs.push_back(ArgLoc.getArgument());
1675 } else {
1676 declarator.setInvalidType(true);
1677 }
1678 }
1679 Result = S.Context.getAutoType(QualType(), AutoKW,
1680 /*IsDependent*/ false, /*IsPack=*/false,
1681 TypeConstraintConcept, TemplateArgs);
1682 break;
1683 }
1684
1685 case DeclSpec::TST_auto_type:
1686 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
1687 break;
1688
1689 case DeclSpec::TST_unknown_anytype:
1690 Result = Context.UnknownAnyTy;
1691 break;
1692
1693 case DeclSpec::TST_atomic:
1694 Result = S.GetTypeFromParser(DS.getRepAsType());
1695 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
1696 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1697 if (Result.isNull()) {
1698 Result = Context.IntTy;
1699 declarator.setInvalidType(true);
1700 }
1701 break;
1702
1703 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
1704 case DeclSpec::TST_##ImgType##_t: \
1705 switch (getImageAccess(DS.getAttributes())) { \
1706 case OpenCLAccessAttr::Keyword_write_only: \
1707 Result = Context.Id##WOTy; \
1708 break; \
1709 case OpenCLAccessAttr::Keyword_read_write: \
1710 Result = Context.Id##RWTy; \
1711 break; \
1712 case OpenCLAccessAttr::Keyword_read_only: \
1713 Result = Context.Id##ROTy; \
1714 break; \
1715 case OpenCLAccessAttr::SpellingNotCalculated: \
1716 llvm_unreachable("Spelling not yet calculated"); \
1717 } \
1718 break;
1719 #include "clang/Basic/OpenCLImageTypes.def"
1720
1721 case DeclSpec::TST_error:
1722 Result = Context.IntTy;
1723 declarator.setInvalidType(true);
1724 break;
1725 }
1726
1727 // FIXME: we want resulting declarations to be marked invalid, but claiming
1728 // the type is invalid is too strong - e.g. it causes ActOnTypeName to return
1729 // a null type.
1730 if (Result->containsErrors())
1731 declarator.setInvalidType();
1732
1733 if (S.getLangOpts().OpenCL) {
1734 const auto &OpenCLOptions = S.getOpenCLOptions();
1735 bool IsOpenCLC30Compatible =
1736 S.getLangOpts().getOpenCLCompatibleVersion() == 300;
1737 // OpenCL C v3.0 s6.3.3 - OpenCL image types require __opencl_c_images
1738 // support.
1739 // OpenCL C v3.0 s6.2.1 - OpenCL 3d image write types requires support
1740 // for OpenCL C 2.0, or OpenCL C 3.0 or newer and the
1741 // __opencl_c_3d_image_writes feature. OpenCL C v3.0 API s4.2 - For devices
1742 // that support OpenCL 3.0, cl_khr_3d_image_writes must be returned when and
1743 // only when the optional feature is supported
1744 if ((Result->isImageType() || Result->isSamplerT()) &&
1745 (IsOpenCLC30Compatible &&
1746 !OpenCLOptions.isSupported("__opencl_c_images", S.getLangOpts()))) {
1747 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1748 << 0 << Result << "__opencl_c_images";
1749 declarator.setInvalidType();
1750 } else if (Result->isOCLImage3dWOType() &&
1751 !OpenCLOptions.isSupported("cl_khr_3d_image_writes",
1752 S.getLangOpts())) {
1753 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1754 << 0 << Result
1755 << (IsOpenCLC30Compatible
1756 ? "cl_khr_3d_image_writes and __opencl_c_3d_image_writes"
1757 : "cl_khr_3d_image_writes");
1758 declarator.setInvalidType();
1759 }
1760 }
1761
1762 bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum ||
1763 DS.getTypeSpecType() == DeclSpec::TST_fract;
1764
1765 // Only fixed point types can be saturated
1766 if (DS.isTypeSpecSat() && !IsFixedPointType)
1767 S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec)
1768 << DS.getSpecifierName(DS.getTypeSpecType(),
1769 Context.getPrintingPolicy());
1770
1771 // Handle complex types.
1772 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1773 if (S.getLangOpts().Freestanding)
1774 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1775 Result = Context.getComplexType(Result);
1776 } else if (DS.isTypeAltiVecVector()) {
1777 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1778 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
1779 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
1780 if (DS.isTypeAltiVecPixel())
1781 VecKind = VectorType::AltiVecPixel;
1782 else if (DS.isTypeAltiVecBool())
1783 VecKind = VectorType::AltiVecBool;
1784 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1785 }
1786
1787 // FIXME: Imaginary.
1788 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1789 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1790
1791 // Before we process any type attributes, synthesize a block literal
1792 // function declarator if necessary.
1793 if (declarator.getContext() == DeclaratorContext::BlockLiteral)
1794 maybeSynthesizeBlockSignature(state, Result);
1795
1796 // Apply any type attributes from the decl spec. This may cause the
1797 // list of type attributes to be temporarily saved while the type
1798 // attributes are pushed around.
1799 // pipe attributes will be handled later ( at GetFullTypeForDeclarator )
1800 if (!DS.isTypeSpecPipe())
1801 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes());
1802
1803 // Apply const/volatile/restrict qualifiers to T.
1804 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1805 // Warn about CV qualifiers on function types.
1806 // C99 6.7.3p8:
1807 // If the specification of a function type includes any type qualifiers,
1808 // the behavior is undefined.
1809 // C++11 [dcl.fct]p7:
1810 // The effect of a cv-qualifier-seq in a function declarator is not the
1811 // same as adding cv-qualification on top of the function type. In the
1812 // latter case, the cv-qualifiers are ignored.
1813 if (Result->isFunctionType()) {
1814 diagnoseAndRemoveTypeQualifiers(
1815 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1816 S.getLangOpts().CPlusPlus
1817 ? diag::warn_typecheck_function_qualifiers_ignored
1818 : diag::warn_typecheck_function_qualifiers_unspecified);
1819 // No diagnostic for 'restrict' or '_Atomic' applied to a
1820 // function type; we'll diagnose those later, in BuildQualifiedType.
1821 }
1822
1823 // C++11 [dcl.ref]p1:
1824 // Cv-qualified references are ill-formed except when the
1825 // cv-qualifiers are introduced through the use of a typedef-name
1826 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1827 //
1828 // There don't appear to be any other contexts in which a cv-qualified
1829 // reference type could be formed, so the 'ill-formed' clause here appears
1830 // to never happen.
1831 if (TypeQuals && Result->isReferenceType()) {
1832 diagnoseAndRemoveTypeQualifiers(
1833 S, DS, TypeQuals, Result,
1834 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1835 diag::warn_typecheck_reference_qualifiers);
1836 }
1837
1838 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1839 // than once in the same specifier-list or qualifier-list, either directly
1840 // or via one or more typedefs."
1841 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1842 && TypeQuals & Result.getCVRQualifiers()) {
1843 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1844 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1845 << "const";
1846 }
1847
1848 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1849 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1850 << "volatile";
1851 }
1852
1853 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1854 // produce a warning in this case.
1855 }
1856
1857 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1858
1859 // If adding qualifiers fails, just use the unqualified type.
1860 if (Qualified.isNull())
1861 declarator.setInvalidType(true);
1862 else
1863 Result = Qualified;
1864 }
1865
1866 assert(!Result.isNull() && "This function should not return a null type");
1867 return Result;
1868 }
1869
getPrintableNameForEntity(DeclarationName Entity)1870 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1871 if (Entity)
1872 return Entity.getAsString();
1873
1874 return "type name";
1875 }
1876
BuildQualifiedType(QualType T,SourceLocation Loc,Qualifiers Qs,const DeclSpec * DS)1877 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1878 Qualifiers Qs, const DeclSpec *DS) {
1879 if (T.isNull())
1880 return QualType();
1881
1882 // Ignore any attempt to form a cv-qualified reference.
1883 if (T->isReferenceType()) {
1884 Qs.removeConst();
1885 Qs.removeVolatile();
1886 }
1887
1888 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1889 // object or incomplete types shall not be restrict-qualified."
1890 if (Qs.hasRestrict()) {
1891 unsigned DiagID = 0;
1892 QualType ProblemTy;
1893
1894 if (T->isAnyPointerType() || T->isReferenceType() ||
1895 T->isMemberPointerType()) {
1896 QualType EltTy;
1897 if (T->isObjCObjectPointerType())
1898 EltTy = T;
1899 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1900 EltTy = PTy->getPointeeType();
1901 else
1902 EltTy = T->getPointeeType();
1903
1904 // If we have a pointer or reference, the pointee must have an object
1905 // incomplete type.
1906 if (!EltTy->isIncompleteOrObjectType()) {
1907 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1908 ProblemTy = EltTy;
1909 }
1910 } else if (!T->isDependentType()) {
1911 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1912 ProblemTy = T;
1913 }
1914
1915 if (DiagID) {
1916 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1917 Qs.removeRestrict();
1918 }
1919 }
1920
1921 return Context.getQualifiedType(T, Qs);
1922 }
1923
BuildQualifiedType(QualType T,SourceLocation Loc,unsigned CVRAU,const DeclSpec * DS)1924 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1925 unsigned CVRAU, const DeclSpec *DS) {
1926 if (T.isNull())
1927 return QualType();
1928
1929 // Ignore any attempt to form a cv-qualified reference.
1930 if (T->isReferenceType())
1931 CVRAU &=
1932 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);
1933
1934 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
1935 // TQ_unaligned;
1936 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);
1937
1938 // C11 6.7.3/5:
1939 // If the same qualifier appears more than once in the same
1940 // specifier-qualifier-list, either directly or via one or more typedefs,
1941 // the behavior is the same as if it appeared only once.
1942 //
1943 // It's not specified what happens when the _Atomic qualifier is applied to
1944 // a type specified with the _Atomic specifier, but we assume that this
1945 // should be treated as if the _Atomic qualifier appeared multiple times.
1946 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
1947 // C11 6.7.3/5:
1948 // If other qualifiers appear along with the _Atomic qualifier in a
1949 // specifier-qualifier-list, the resulting type is the so-qualified
1950 // atomic type.
1951 //
1952 // Don't need to worry about array types here, since _Atomic can't be
1953 // applied to such types.
1954 SplitQualType Split = T.getSplitUnqualifiedType();
1955 T = BuildAtomicType(QualType(Split.Ty, 0),
1956 DS ? DS->getAtomicSpecLoc() : Loc);
1957 if (T.isNull())
1958 return T;
1959 Split.Quals.addCVRQualifiers(CVR);
1960 return BuildQualifiedType(T, Loc, Split.Quals);
1961 }
1962
1963 Qualifiers Q = Qualifiers::fromCVRMask(CVR);
1964 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
1965 return BuildQualifiedType(T, Loc, Q, DS);
1966 }
1967
1968 /// Build a paren type including \p T.
BuildParenType(QualType T)1969 QualType Sema::BuildParenType(QualType T) {
1970 return Context.getParenType(T);
1971 }
1972
1973 /// Given that we're building a pointer or reference to the given
inferARCLifetimeForPointee(Sema & S,QualType type,SourceLocation loc,bool isReference)1974 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
1975 SourceLocation loc,
1976 bool isReference) {
1977 // Bail out if retention is unrequired or already specified.
1978 if (!type->isObjCLifetimeType() ||
1979 type.getObjCLifetime() != Qualifiers::OCL_None)
1980 return type;
1981
1982 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
1983
1984 // If the object type is const-qualified, we can safely use
1985 // __unsafe_unretained. This is safe (because there are no read
1986 // barriers), and it'll be safe to coerce anything but __weak* to
1987 // the resulting type.
1988 if (type.isConstQualified()) {
1989 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1990
1991 // Otherwise, check whether the static type does not require
1992 // retaining. This currently only triggers for Class (possibly
1993 // protocol-qualifed, and arrays thereof).
1994 } else if (type->isObjCARCImplicitlyUnretainedType()) {
1995 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1996
1997 // If we are in an unevaluated context, like sizeof, skip adding a
1998 // qualification.
1999 } else if (S.isUnevaluatedContext()) {
2000 return type;
2001
2002 // If that failed, give an error and recover using __strong. __strong
2003 // is the option most likely to prevent spurious second-order diagnostics,
2004 // like when binding a reference to a field.
2005 } else {
2006 // These types can show up in private ivars in system headers, so
2007 // we need this to not be an error in those cases. Instead we
2008 // want to delay.
2009 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
2010 S.DelayedDiagnostics.add(
2011 sema::DelayedDiagnostic::makeForbiddenType(loc,
2012 diag::err_arc_indirect_no_ownership, type, isReference));
2013 } else {
2014 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
2015 }
2016 implicitLifetime = Qualifiers::OCL_Strong;
2017 }
2018 assert(implicitLifetime && "didn't infer any lifetime!");
2019
2020 Qualifiers qs;
2021 qs.addObjCLifetime(implicitLifetime);
2022 return S.Context.getQualifiedType(type, qs);
2023 }
2024
getFunctionQualifiersAsString(const FunctionProtoType * FnTy)2025 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
2026 std::string Quals = FnTy->getMethodQuals().getAsString();
2027
2028 switch (FnTy->getRefQualifier()) {
2029 case RQ_None:
2030 break;
2031
2032 case RQ_LValue:
2033 if (!Quals.empty())
2034 Quals += ' ';
2035 Quals += '&';
2036 break;
2037
2038 case RQ_RValue:
2039 if (!Quals.empty())
2040 Quals += ' ';
2041 Quals += "&&";
2042 break;
2043 }
2044
2045 return Quals;
2046 }
2047
2048 namespace {
2049 /// Kinds of declarator that cannot contain a qualified function type.
2050 ///
2051 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
2052 /// a function type with a cv-qualifier or a ref-qualifier can only appear
2053 /// at the topmost level of a type.
2054 ///
2055 /// Parens and member pointers are permitted. We don't diagnose array and
2056 /// function declarators, because they don't allow function types at all.
2057 ///
2058 /// The values of this enum are used in diagnostics.
2059 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
2060 } // end anonymous namespace
2061
2062 /// Check whether the type T is a qualified function type, and if it is,
2063 /// diagnose that it cannot be contained within the given kind of declarator.
checkQualifiedFunction(Sema & S,QualType T,SourceLocation Loc,QualifiedFunctionKind QFK)2064 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
2065 QualifiedFunctionKind QFK) {
2066 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
2067 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2068 if (!FPT ||
2069 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2070 return false;
2071
2072 S.Diag(Loc, diag::err_compound_qualified_function_type)
2073 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
2074 << getFunctionQualifiersAsString(FPT);
2075 return true;
2076 }
2077
CheckQualifiedFunctionForTypeId(QualType T,SourceLocation Loc)2078 bool Sema::CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc) {
2079 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2080 if (!FPT ||
2081 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2082 return false;
2083
2084 Diag(Loc, diag::err_qualified_function_typeid)
2085 << T << getFunctionQualifiersAsString(FPT);
2086 return true;
2087 }
2088
2089 // Helper to deduce addr space of a pointee type in OpenCL mode.
deduceOpenCLPointeeAddrSpace(Sema & S,QualType PointeeType)2090 static QualType deduceOpenCLPointeeAddrSpace(Sema &S, QualType PointeeType) {
2091 if (!PointeeType->isUndeducedAutoType() && !PointeeType->isDependentType() &&
2092 !PointeeType->isSamplerT() &&
2093 !PointeeType.hasAddressSpace())
2094 PointeeType = S.getASTContext().getAddrSpaceQualType(
2095 PointeeType, S.getASTContext().getDefaultOpenCLPointeeAddrSpace());
2096 return PointeeType;
2097 }
2098
2099 /// Build a pointer type.
2100 ///
2101 /// \param T The type to which we'll be building a pointer.
2102 ///
2103 /// \param Loc The location of the entity whose type involves this
2104 /// pointer type or, if there is no such entity, the location of the
2105 /// type that will have pointer type.
2106 ///
2107 /// \param Entity The name of the entity that involves the pointer
2108 /// type, if known.
2109 ///
2110 /// \returns A suitable pointer type, if there are no
2111 /// errors. Otherwise, returns a NULL type.
BuildPointerType(QualType T,SourceLocation Loc,DeclarationName Entity)2112 QualType Sema::BuildPointerType(QualType T,
2113 SourceLocation Loc, DeclarationName Entity) {
2114 if (T->isReferenceType()) {
2115 // C++ 8.3.2p4: There shall be no ... pointers to references ...
2116 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
2117 << getPrintableNameForEntity(Entity) << T;
2118 return QualType();
2119 }
2120
2121 if (T->isFunctionType() && getLangOpts().OpenCL &&
2122 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2123 getLangOpts())) {
2124 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
2125 return QualType();
2126 }
2127
2128 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
2129 return QualType();
2130
2131 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
2132
2133 // In ARC, it is forbidden to build pointers to unqualified pointers.
2134 if (getLangOpts().ObjCAutoRefCount)
2135 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
2136
2137 if (getLangOpts().OpenCL)
2138 T = deduceOpenCLPointeeAddrSpace(*this, T);
2139
2140 // Build the pointer type.
2141 return Context.getPointerType(T);
2142 }
2143
2144 /// Build a reference type.
2145 ///
2146 /// \param T The type to which we'll be building a reference.
2147 ///
2148 /// \param Loc The location of the entity whose type involves this
2149 /// reference type or, if there is no such entity, the location of the
2150 /// type that will have reference type.
2151 ///
2152 /// \param Entity The name of the entity that involves the reference
2153 /// type, if known.
2154 ///
2155 /// \returns A suitable reference type, if there are no
2156 /// errors. Otherwise, returns a NULL type.
BuildReferenceType(QualType T,bool SpelledAsLValue,SourceLocation Loc,DeclarationName Entity)2157 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
2158 SourceLocation Loc,
2159 DeclarationName Entity) {
2160 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
2161 "Unresolved overloaded function type");
2162
2163 // C++0x [dcl.ref]p6:
2164 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
2165 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
2166 // type T, an attempt to create the type "lvalue reference to cv TR" creates
2167 // the type "lvalue reference to T", while an attempt to create the type
2168 // "rvalue reference to cv TR" creates the type TR.
2169 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
2170
2171 // C++ [dcl.ref]p4: There shall be no references to references.
2172 //
2173 // According to C++ DR 106, references to references are only
2174 // diagnosed when they are written directly (e.g., "int & &"),
2175 // but not when they happen via a typedef:
2176 //
2177 // typedef int& intref;
2178 // typedef intref& intref2;
2179 //
2180 // Parser::ParseDeclaratorInternal diagnoses the case where
2181 // references are written directly; here, we handle the
2182 // collapsing of references-to-references as described in C++0x.
2183 // DR 106 and 540 introduce reference-collapsing into C++98/03.
2184
2185 // C++ [dcl.ref]p1:
2186 // A declarator that specifies the type "reference to cv void"
2187 // is ill-formed.
2188 if (T->isVoidType()) {
2189 Diag(Loc, diag::err_reference_to_void);
2190 return QualType();
2191 }
2192
2193 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
2194 return QualType();
2195
2196 if (T->isFunctionType() && getLangOpts().OpenCL &&
2197 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2198 getLangOpts())) {
2199 Diag(Loc, diag::err_opencl_function_pointer) << /*reference*/ 1;
2200 return QualType();
2201 }
2202
2203 // In ARC, it is forbidden to build references to unqualified pointers.
2204 if (getLangOpts().ObjCAutoRefCount)
2205 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
2206
2207 if (getLangOpts().OpenCL)
2208 T = deduceOpenCLPointeeAddrSpace(*this, T);
2209
2210 // Handle restrict on references.
2211 if (LValueRef)
2212 return Context.getLValueReferenceType(T, SpelledAsLValue);
2213 return Context.getRValueReferenceType(T);
2214 }
2215
2216 /// Build a Read-only Pipe type.
2217 ///
2218 /// \param T The type to which we'll be building a Pipe.
2219 ///
2220 /// \param Loc We do not use it for now.
2221 ///
2222 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2223 /// NULL type.
BuildReadPipeType(QualType T,SourceLocation Loc)2224 QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
2225 return Context.getReadPipeType(T);
2226 }
2227
2228 /// Build a Write-only Pipe type.
2229 ///
2230 /// \param T The type to which we'll be building a Pipe.
2231 ///
2232 /// \param Loc We do not use it for now.
2233 ///
2234 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2235 /// NULL type.
BuildWritePipeType(QualType T,SourceLocation Loc)2236 QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
2237 return Context.getWritePipeType(T);
2238 }
2239
2240 /// Build a extended int type.
2241 ///
2242 /// \param IsUnsigned Boolean representing the signedness of the type.
2243 ///
2244 /// \param BitWidth Size of this int type in bits, or an expression representing
2245 /// that.
2246 ///
2247 /// \param Loc Location of the keyword.
BuildExtIntType(bool IsUnsigned,Expr * BitWidth,SourceLocation Loc)2248 QualType Sema::BuildExtIntType(bool IsUnsigned, Expr *BitWidth,
2249 SourceLocation Loc) {
2250 if (BitWidth->isInstantiationDependent())
2251 return Context.getDependentExtIntType(IsUnsigned, BitWidth);
2252
2253 llvm::APSInt Bits(32);
2254 ExprResult ICE =
2255 VerifyIntegerConstantExpression(BitWidth, &Bits, /*FIXME*/ AllowFold);
2256
2257 if (ICE.isInvalid())
2258 return QualType();
2259
2260 int64_t NumBits = Bits.getSExtValue();
2261 if (!IsUnsigned && NumBits < 2) {
2262 Diag(Loc, diag::err_ext_int_bad_size) << 0;
2263 return QualType();
2264 }
2265
2266 if (IsUnsigned && NumBits < 1) {
2267 Diag(Loc, diag::err_ext_int_bad_size) << 1;
2268 return QualType();
2269 }
2270
2271 if (NumBits > llvm::IntegerType::MAX_INT_BITS) {
2272 Diag(Loc, diag::err_ext_int_max_size) << IsUnsigned
2273 << llvm::IntegerType::MAX_INT_BITS;
2274 return QualType();
2275 }
2276
2277 return Context.getExtIntType(IsUnsigned, NumBits);
2278 }
2279
2280 /// Check whether the specified array bound can be evaluated using the relevant
2281 /// language rules. If so, returns the possibly-converted expression and sets
2282 /// SizeVal to the size. If not, but the expression might be a VLA bound,
2283 /// returns ExprResult(). Otherwise, produces a diagnostic and returns
2284 /// ExprError().
checkArraySize(Sema & S,Expr * & ArraySize,llvm::APSInt & SizeVal,unsigned VLADiag,bool VLAIsError)2285 static ExprResult checkArraySize(Sema &S, Expr *&ArraySize,
2286 llvm::APSInt &SizeVal, unsigned VLADiag,
2287 bool VLAIsError) {
2288 if (S.getLangOpts().CPlusPlus14 &&
2289 (VLAIsError ||
2290 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType())) {
2291 // C++14 [dcl.array]p1:
2292 // The constant-expression shall be a converted constant expression of
2293 // type std::size_t.
2294 //
2295 // Don't apply this rule if we might be forming a VLA: in that case, we
2296 // allow non-constant expressions and constant-folding. We only need to use
2297 // the converted constant expression rules (to properly convert the source)
2298 // when the source expression is of class type.
2299 return S.CheckConvertedConstantExpression(
2300 ArraySize, S.Context.getSizeType(), SizeVal, Sema::CCEK_ArrayBound);
2301 }
2302
2303 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
2304 // (like gnu99, but not c99) accept any evaluatable value as an extension.
2305 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
2306 public:
2307 unsigned VLADiag;
2308 bool VLAIsError;
2309 bool IsVLA = false;
2310
2311 VLADiagnoser(unsigned VLADiag, bool VLAIsError)
2312 : VLADiag(VLADiag), VLAIsError(VLAIsError) {}
2313
2314 Sema::SemaDiagnosticBuilder diagnoseNotICEType(Sema &S, SourceLocation Loc,
2315 QualType T) override {
2316 return S.Diag(Loc, diag::err_array_size_non_int) << T;
2317 }
2318
2319 Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S,
2320 SourceLocation Loc) override {
2321 IsVLA = !VLAIsError;
2322 return S.Diag(Loc, VLADiag);
2323 }
2324
2325 Sema::SemaDiagnosticBuilder diagnoseFold(Sema &S,
2326 SourceLocation Loc) override {
2327 return S.Diag(Loc, diag::ext_vla_folded_to_constant);
2328 }
2329 } Diagnoser(VLADiag, VLAIsError);
2330
2331 ExprResult R =
2332 S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser);
2333 if (Diagnoser.IsVLA)
2334 return ExprResult();
2335 return R;
2336 }
2337
2338 /// Build an array type.
2339 ///
2340 /// \param T The type of each element in the array.
2341 ///
2342 /// \param ASM C99 array size modifier (e.g., '*', 'static').
2343 ///
2344 /// \param ArraySize Expression describing the size of the array.
2345 ///
2346 /// \param Brackets The range from the opening '[' to the closing ']'.
2347 ///
2348 /// \param Entity The name of the entity that involves the array
2349 /// type, if known.
2350 ///
2351 /// \returns A suitable array type, if there are no errors. Otherwise,
2352 /// returns a NULL type.
BuildArrayType(QualType T,ArrayType::ArraySizeModifier ASM,Expr * ArraySize,unsigned Quals,SourceRange Brackets,DeclarationName Entity)2353 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
2354 Expr *ArraySize, unsigned Quals,
2355 SourceRange Brackets, DeclarationName Entity) {
2356
2357 SourceLocation Loc = Brackets.getBegin();
2358 if (getLangOpts().CPlusPlus) {
2359 // C++ [dcl.array]p1:
2360 // T is called the array element type; this type shall not be a reference
2361 // type, the (possibly cv-qualified) type void, a function type or an
2362 // abstract class type.
2363 //
2364 // C++ [dcl.array]p3:
2365 // When several "array of" specifications are adjacent, [...] only the
2366 // first of the constant expressions that specify the bounds of the arrays
2367 // may be omitted.
2368 //
2369 // Note: function types are handled in the common path with C.
2370 if (T->isReferenceType()) {
2371 Diag(Loc, diag::err_illegal_decl_array_of_references)
2372 << getPrintableNameForEntity(Entity) << T;
2373 return QualType();
2374 }
2375
2376 if (T->isVoidType() || T->isIncompleteArrayType()) {
2377 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 0 << T;
2378 return QualType();
2379 }
2380
2381 if (RequireNonAbstractType(Brackets.getBegin(), T,
2382 diag::err_array_of_abstract_type))
2383 return QualType();
2384
2385 // Mentioning a member pointer type for an array type causes us to lock in
2386 // an inheritance model, even if it's inside an unused typedef.
2387 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
2388 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
2389 if (!MPTy->getClass()->isDependentType())
2390 (void)isCompleteType(Loc, T);
2391
2392 } else {
2393 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
2394 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
2395 if (RequireCompleteSizedType(Loc, T,
2396 diag::err_array_incomplete_or_sizeless_type))
2397 return QualType();
2398 }
2399
2400 if (T->isSizelessType()) {
2401 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 1 << T;
2402 return QualType();
2403 }
2404
2405 if (T->isFunctionType()) {
2406 Diag(Loc, diag::err_illegal_decl_array_of_functions)
2407 << getPrintableNameForEntity(Entity) << T;
2408 return QualType();
2409 }
2410
2411 if (const RecordType *EltTy = T->getAs<RecordType>()) {
2412 // If the element type is a struct or union that contains a variadic
2413 // array, accept it as a GNU extension: C99 6.7.2.1p2.
2414 if (EltTy->getDecl()->hasFlexibleArrayMember())
2415 Diag(Loc, diag::ext_flexible_array_in_array) << T;
2416 } else if (T->isObjCObjectType()) {
2417 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
2418 return QualType();
2419 }
2420
2421 // Do placeholder conversions on the array size expression.
2422 if (ArraySize && ArraySize->hasPlaceholderType()) {
2423 ExprResult Result = CheckPlaceholderExpr(ArraySize);
2424 if (Result.isInvalid()) return QualType();
2425 ArraySize = Result.get();
2426 }
2427
2428 // Do lvalue-to-rvalue conversions on the array size expression.
2429 if (ArraySize && !ArraySize->isPRValue()) {
2430 ExprResult Result = DefaultLvalueConversion(ArraySize);
2431 if (Result.isInvalid())
2432 return QualType();
2433
2434 ArraySize = Result.get();
2435 }
2436
2437 // C99 6.7.5.2p1: The size expression shall have integer type.
2438 // C++11 allows contextual conversions to such types.
2439 if (!getLangOpts().CPlusPlus11 &&
2440 ArraySize && !ArraySize->isTypeDependent() &&
2441 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2442 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
2443 << ArraySize->getType() << ArraySize->getSourceRange();
2444 return QualType();
2445 }
2446
2447 // VLAs always produce at least a -Wvla diagnostic, sometimes an error.
2448 unsigned VLADiag;
2449 bool VLAIsError;
2450 if (getLangOpts().OpenCL) {
2451 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
2452 VLADiag = diag::err_opencl_vla;
2453 VLAIsError = true;
2454 } else if (getLangOpts().C99) {
2455 VLADiag = diag::warn_vla_used;
2456 VLAIsError = false;
2457 } else if (isSFINAEContext()) {
2458 VLADiag = diag::err_vla_in_sfinae;
2459 VLAIsError = true;
2460 } else {
2461 VLADiag = diag::ext_vla;
2462 VLAIsError = false;
2463 }
2464
2465 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
2466 if (!ArraySize) {
2467 if (ASM == ArrayType::Star) {
2468 Diag(Loc, VLADiag);
2469 if (VLAIsError)
2470 return QualType();
2471
2472 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
2473 } else {
2474 T = Context.getIncompleteArrayType(T, ASM, Quals);
2475 }
2476 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
2477 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
2478 } else {
2479 ExprResult R =
2480 checkArraySize(*this, ArraySize, ConstVal, VLADiag, VLAIsError);
2481 if (R.isInvalid())
2482 return QualType();
2483
2484 if (!R.isUsable()) {
2485 // C99: an array with a non-ICE size is a VLA. We accept any expression
2486 // that we can fold to a non-zero positive value as a non-VLA as an
2487 // extension.
2488 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2489 } else if (!T->isDependentType() && !T->isIncompleteType() &&
2490 !T->isConstantSizeType()) {
2491 // C99: an array with an element type that has a non-constant-size is a
2492 // VLA.
2493 // FIXME: Add a note to explain why this isn't a VLA.
2494 Diag(Loc, VLADiag);
2495 if (VLAIsError)
2496 return QualType();
2497 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2498 } else {
2499 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
2500 // have a value greater than zero.
2501 // In C++, this follows from narrowing conversions being disallowed.
2502 if (ConstVal.isSigned() && ConstVal.isNegative()) {
2503 if (Entity)
2504 Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size)
2505 << getPrintableNameForEntity(Entity)
2506 << ArraySize->getSourceRange();
2507 else
2508 Diag(ArraySize->getBeginLoc(),
2509 diag::err_typecheck_negative_array_size)
2510 << ArraySize->getSourceRange();
2511 return QualType();
2512 }
2513 if (ConstVal == 0) {
2514 // GCC accepts zero sized static arrays. We allow them when
2515 // we're not in a SFINAE context.
2516 Diag(ArraySize->getBeginLoc(),
2517 isSFINAEContext() ? diag::err_typecheck_zero_array_size
2518 : diag::ext_typecheck_zero_array_size)
2519 << ArraySize->getSourceRange();
2520 }
2521
2522 // Is the array too large?
2523 unsigned ActiveSizeBits =
2524 (!T->isDependentType() && !T->isVariablyModifiedType() &&
2525 !T->isIncompleteType() && !T->isUndeducedType())
2526 ? ConstantArrayType::getNumAddressingBits(Context, T, ConstVal)
2527 : ConstVal.getActiveBits();
2528 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2529 Diag(ArraySize->getBeginLoc(), diag::err_array_too_large)
2530 << toString(ConstVal, 10) << ArraySize->getSourceRange();
2531 return QualType();
2532 }
2533
2534 T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
2535 }
2536 }
2537
2538 if (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) {
2539 // CUDA device code and some other targets don't support VLAs.
2540 targetDiag(Loc, (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2541 ? diag::err_cuda_vla
2542 : diag::err_vla_unsupported)
2543 << ((getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2544 ? CurrentCUDATarget()
2545 : CFT_InvalidTarget);
2546 }
2547
2548 // If this is not C99, diagnose array size modifiers on non-VLAs.
2549 if (!getLangOpts().C99 && !T->isVariableArrayType() &&
2550 (ASM != ArrayType::Normal || Quals != 0)) {
2551 Diag(Loc, getLangOpts().CPlusPlus ? diag::err_c99_array_usage_cxx
2552 : diag::ext_c99_array_usage)
2553 << ASM;
2554 }
2555
2556 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
2557 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
2558 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
2559 if (getLangOpts().OpenCL) {
2560 const QualType ArrType = Context.getBaseElementType(T);
2561 if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
2562 ArrType->isSamplerT() || ArrType->isImageType()) {
2563 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
2564 return QualType();
2565 }
2566 }
2567
2568 return T;
2569 }
2570
BuildVectorType(QualType CurType,Expr * SizeExpr,SourceLocation AttrLoc)2571 QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr,
2572 SourceLocation AttrLoc) {
2573 // The base type must be integer (not Boolean or enumeration) or float, and
2574 // can't already be a vector.
2575 if ((!CurType->isDependentType() &&
2576 (!CurType->isBuiltinType() || CurType->isBooleanType() ||
2577 (!CurType->isIntegerType() && !CurType->isRealFloatingType()))) ||
2578 CurType->isArrayType()) {
2579 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType;
2580 return QualType();
2581 }
2582
2583 if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent())
2584 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2585 VectorType::GenericVector);
2586
2587 Optional<llvm::APSInt> VecSize = SizeExpr->getIntegerConstantExpr(Context);
2588 if (!VecSize) {
2589 Diag(AttrLoc, diag::err_attribute_argument_type)
2590 << "vector_size" << AANT_ArgumentIntegerConstant
2591 << SizeExpr->getSourceRange();
2592 return QualType();
2593 }
2594
2595 if (CurType->isDependentType())
2596 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2597 VectorType::GenericVector);
2598
2599 // vecSize is specified in bytes - convert to bits.
2600 if (!VecSize->isIntN(61)) {
2601 // Bit size will overflow uint64.
2602 Diag(AttrLoc, diag::err_attribute_size_too_large)
2603 << SizeExpr->getSourceRange() << "vector";
2604 return QualType();
2605 }
2606 uint64_t VectorSizeBits = VecSize->getZExtValue() * 8;
2607 unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType));
2608
2609 if (VectorSizeBits == 0) {
2610 Diag(AttrLoc, diag::err_attribute_zero_size)
2611 << SizeExpr->getSourceRange() << "vector";
2612 return QualType();
2613 }
2614
2615 if (VectorSizeBits % TypeSize) {
2616 Diag(AttrLoc, diag::err_attribute_invalid_size)
2617 << SizeExpr->getSourceRange();
2618 return QualType();
2619 }
2620
2621 if (VectorSizeBits / TypeSize > std::numeric_limits<uint32_t>::max()) {
2622 Diag(AttrLoc, diag::err_attribute_size_too_large)
2623 << SizeExpr->getSourceRange() << "vector";
2624 return QualType();
2625 }
2626
2627 return Context.getVectorType(CurType, VectorSizeBits / TypeSize,
2628 VectorType::GenericVector);
2629 }
2630
2631 /// Build an ext-vector type.
2632 ///
2633 /// Run the required checks for the extended vector type.
BuildExtVectorType(QualType T,Expr * ArraySize,SourceLocation AttrLoc)2634 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
2635 SourceLocation AttrLoc) {
2636 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined
2637 // in conjunction with complex types (pointers, arrays, functions, etc.).
2638 //
2639 // Additionally, OpenCL prohibits vectors of booleans (they're considered a
2640 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
2641 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
2642 // of bool aren't allowed.
2643 if ((!T->isDependentType() && !T->isIntegerType() &&
2644 !T->isRealFloatingType()) ||
2645 T->isBooleanType()) {
2646 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
2647 return QualType();
2648 }
2649
2650 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
2651 Optional<llvm::APSInt> vecSize = ArraySize->getIntegerConstantExpr(Context);
2652 if (!vecSize) {
2653 Diag(AttrLoc, diag::err_attribute_argument_type)
2654 << "ext_vector_type" << AANT_ArgumentIntegerConstant
2655 << ArraySize->getSourceRange();
2656 return QualType();
2657 }
2658
2659 if (!vecSize->isIntN(32)) {
2660 Diag(AttrLoc, diag::err_attribute_size_too_large)
2661 << ArraySize->getSourceRange() << "vector";
2662 return QualType();
2663 }
2664 // Unlike gcc's vector_size attribute, the size is specified as the
2665 // number of elements, not the number of bytes.
2666 unsigned vectorSize = static_cast<unsigned>(vecSize->getZExtValue());
2667
2668 if (vectorSize == 0) {
2669 Diag(AttrLoc, diag::err_attribute_zero_size)
2670 << ArraySize->getSourceRange() << "vector";
2671 return QualType();
2672 }
2673
2674 return Context.getExtVectorType(T, vectorSize);
2675 }
2676
2677 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2678 }
2679
BuildMatrixType(QualType ElementTy,Expr * NumRows,Expr * NumCols,SourceLocation AttrLoc)2680 QualType Sema::BuildMatrixType(QualType ElementTy, Expr *NumRows, Expr *NumCols,
2681 SourceLocation AttrLoc) {
2682 assert(Context.getLangOpts().MatrixTypes &&
2683 "Should never build a matrix type when it is disabled");
2684
2685 // Check element type, if it is not dependent.
2686 if (!ElementTy->isDependentType() &&
2687 !MatrixType::isValidElementType(ElementTy)) {
2688 Diag(AttrLoc, diag::err_attribute_invalid_matrix_type) << ElementTy;
2689 return QualType();
2690 }
2691
2692 if (NumRows->isTypeDependent() || NumCols->isTypeDependent() ||
2693 NumRows->isValueDependent() || NumCols->isValueDependent())
2694 return Context.getDependentSizedMatrixType(ElementTy, NumRows, NumCols,
2695 AttrLoc);
2696
2697 Optional<llvm::APSInt> ValueRows = NumRows->getIntegerConstantExpr(Context);
2698 Optional<llvm::APSInt> ValueColumns =
2699 NumCols->getIntegerConstantExpr(Context);
2700
2701 auto const RowRange = NumRows->getSourceRange();
2702 auto const ColRange = NumCols->getSourceRange();
2703
2704 // Both are row and column expressions are invalid.
2705 if (!ValueRows && !ValueColumns) {
2706 Diag(AttrLoc, diag::err_attribute_argument_type)
2707 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange
2708 << ColRange;
2709 return QualType();
2710 }
2711
2712 // Only the row expression is invalid.
2713 if (!ValueRows) {
2714 Diag(AttrLoc, diag::err_attribute_argument_type)
2715 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange;
2716 return QualType();
2717 }
2718
2719 // Only the column expression is invalid.
2720 if (!ValueColumns) {
2721 Diag(AttrLoc, diag::err_attribute_argument_type)
2722 << "matrix_type" << AANT_ArgumentIntegerConstant << ColRange;
2723 return QualType();
2724 }
2725
2726 // Check the matrix dimensions.
2727 unsigned MatrixRows = static_cast<unsigned>(ValueRows->getZExtValue());
2728 unsigned MatrixColumns = static_cast<unsigned>(ValueColumns->getZExtValue());
2729 if (MatrixRows == 0 && MatrixColumns == 0) {
2730 Diag(AttrLoc, diag::err_attribute_zero_size)
2731 << "matrix" << RowRange << ColRange;
2732 return QualType();
2733 }
2734 if (MatrixRows == 0) {
2735 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << RowRange;
2736 return QualType();
2737 }
2738 if (MatrixColumns == 0) {
2739 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << ColRange;
2740 return QualType();
2741 }
2742 if (!ConstantMatrixType::isDimensionValid(MatrixRows)) {
2743 Diag(AttrLoc, diag::err_attribute_size_too_large)
2744 << RowRange << "matrix row";
2745 return QualType();
2746 }
2747 if (!ConstantMatrixType::isDimensionValid(MatrixColumns)) {
2748 Diag(AttrLoc, diag::err_attribute_size_too_large)
2749 << ColRange << "matrix column";
2750 return QualType();
2751 }
2752 return Context.getConstantMatrixType(ElementTy, MatrixRows, MatrixColumns);
2753 }
2754
CheckFunctionReturnType(QualType T,SourceLocation Loc)2755 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
2756 if (T->isArrayType() || T->isFunctionType()) {
2757 Diag(Loc, diag::err_func_returning_array_function)
2758 << T->isFunctionType() << T;
2759 return true;
2760 }
2761
2762 // Functions cannot return half FP.
2763 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2764 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
2765 FixItHint::CreateInsertion(Loc, "*");
2766 return true;
2767 }
2768
2769 // Methods cannot return interface types. All ObjC objects are
2770 // passed by reference.
2771 if (T->isObjCObjectType()) {
2772 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
2773 << 0 << T << FixItHint::CreateInsertion(Loc, "*");
2774 return true;
2775 }
2776
2777 if (T.hasNonTrivialToPrimitiveDestructCUnion() ||
2778 T.hasNonTrivialToPrimitiveCopyCUnion())
2779 checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn,
2780 NTCUK_Destruct|NTCUK_Copy);
2781
2782 // C++2a [dcl.fct]p12:
2783 // A volatile-qualified return type is deprecated
2784 if (T.isVolatileQualified() && getLangOpts().CPlusPlus20)
2785 Diag(Loc, diag::warn_deprecated_volatile_return) << T;
2786
2787 return false;
2788 }
2789
2790 /// Check the extended parameter information. Most of the necessary
2791 /// checking should occur when applying the parameter attribute; the
2792 /// only other checks required are positional restrictions.
checkExtParameterInfos(Sema & S,ArrayRef<QualType> paramTypes,const FunctionProtoType::ExtProtoInfo & EPI,llvm::function_ref<SourceLocation (unsigned)> getParamLoc)2793 static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
2794 const FunctionProtoType::ExtProtoInfo &EPI,
2795 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
2796 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos");
2797
2798 bool emittedError = false;
2799 auto actualCC = EPI.ExtInfo.getCC();
2800 enum class RequiredCC { OnlySwift, SwiftOrSwiftAsync };
2801 auto checkCompatible = [&](unsigned paramIndex, RequiredCC required) {
2802 bool isCompatible =
2803 (required == RequiredCC::OnlySwift)
2804 ? (actualCC == CC_Swift)
2805 : (actualCC == CC_Swift || actualCC == CC_SwiftAsync);
2806 if (isCompatible || emittedError)
2807 return;
2808 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
2809 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI())
2810 << (required == RequiredCC::OnlySwift);
2811 emittedError = true;
2812 };
2813 for (size_t paramIndex = 0, numParams = paramTypes.size();
2814 paramIndex != numParams; ++paramIndex) {
2815 switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
2816 // Nothing interesting to check for orindary-ABI parameters.
2817 case ParameterABI::Ordinary:
2818 continue;
2819
2820 // swift_indirect_result parameters must be a prefix of the function
2821 // arguments.
2822 case ParameterABI::SwiftIndirectResult:
2823 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
2824 if (paramIndex != 0 &&
2825 EPI.ExtParameterInfos[paramIndex - 1].getABI()
2826 != ParameterABI::SwiftIndirectResult) {
2827 S.Diag(getParamLoc(paramIndex),
2828 diag::err_swift_indirect_result_not_first);
2829 }
2830 continue;
2831
2832 case ParameterABI::SwiftContext:
2833 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
2834 continue;
2835
2836 // SwiftAsyncContext is not limited to swiftasynccall functions.
2837 case ParameterABI::SwiftAsyncContext:
2838 continue;
2839
2840 // swift_error parameters must be preceded by a swift_context parameter.
2841 case ParameterABI::SwiftErrorResult:
2842 checkCompatible(paramIndex, RequiredCC::OnlySwift);
2843 if (paramIndex == 0 ||
2844 EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
2845 ParameterABI::SwiftContext) {
2846 S.Diag(getParamLoc(paramIndex),
2847 diag::err_swift_error_result_not_after_swift_context);
2848 }
2849 continue;
2850 }
2851 llvm_unreachable("bad ABI kind");
2852 }
2853 }
2854
BuildFunctionType(QualType T,MutableArrayRef<QualType> ParamTypes,SourceLocation Loc,DeclarationName Entity,const FunctionProtoType::ExtProtoInfo & EPI)2855 QualType Sema::BuildFunctionType(QualType T,
2856 MutableArrayRef<QualType> ParamTypes,
2857 SourceLocation Loc, DeclarationName Entity,
2858 const FunctionProtoType::ExtProtoInfo &EPI) {
2859 bool Invalid = false;
2860
2861 Invalid |= CheckFunctionReturnType(T, Loc);
2862
2863 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
2864 // FIXME: Loc is too inprecise here, should use proper locations for args.
2865 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
2866 if (ParamType->isVoidType()) {
2867 Diag(Loc, diag::err_param_with_void_type);
2868 Invalid = true;
2869 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2870 // Disallow half FP arguments.
2871 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
2872 FixItHint::CreateInsertion(Loc, "*");
2873 Invalid = true;
2874 }
2875
2876 // C++2a [dcl.fct]p4:
2877 // A parameter with volatile-qualified type is deprecated
2878 if (ParamType.isVolatileQualified() && getLangOpts().CPlusPlus20)
2879 Diag(Loc, diag::warn_deprecated_volatile_param) << ParamType;
2880
2881 ParamTypes[Idx] = ParamType;
2882 }
2883
2884 if (EPI.ExtParameterInfos) {
2885 checkExtParameterInfos(*this, ParamTypes, EPI,
2886 [=](unsigned i) { return Loc; });
2887 }
2888
2889 if (EPI.ExtInfo.getProducesResult()) {
2890 // This is just a warning, so we can't fail to build if we see it.
2891 checkNSReturnsRetainedReturnType(Loc, T);
2892 }
2893
2894 if (Invalid)
2895 return QualType();
2896
2897 return Context.getFunctionType(T, ParamTypes, EPI);
2898 }
2899
2900 /// Build a member pointer type \c T Class::*.
2901 ///
2902 /// \param T the type to which the member pointer refers.
2903 /// \param Class the class type into which the member pointer points.
2904 /// \param Loc the location where this type begins
2905 /// \param Entity the name of the entity that will have this member pointer type
2906 ///
2907 /// \returns a member pointer type, if successful, or a NULL type if there was
2908 /// an error.
BuildMemberPointerType(QualType T,QualType Class,SourceLocation Loc,DeclarationName Entity)2909 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
2910 SourceLocation Loc,
2911 DeclarationName Entity) {
2912 // Verify that we're not building a pointer to pointer to function with
2913 // exception specification.
2914 if (CheckDistantExceptionSpec(T)) {
2915 Diag(Loc, diag::err_distant_exception_spec);
2916 return QualType();
2917 }
2918
2919 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
2920 // with reference type, or "cv void."
2921 if (T->isReferenceType()) {
2922 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
2923 << getPrintableNameForEntity(Entity) << T;
2924 return QualType();
2925 }
2926
2927 if (T->isVoidType()) {
2928 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
2929 << getPrintableNameForEntity(Entity);
2930 return QualType();
2931 }
2932
2933 if (!Class->isDependentType() && !Class->isRecordType()) {
2934 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
2935 return QualType();
2936 }
2937
2938 if (T->isFunctionType() && getLangOpts().OpenCL &&
2939 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2940 getLangOpts())) {
2941 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
2942 return QualType();
2943 }
2944
2945 // Adjust the default free function calling convention to the default method
2946 // calling convention.
2947 bool IsCtorOrDtor =
2948 (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
2949 (Entity.getNameKind() == DeclarationName::CXXDestructorName);
2950 if (T->isFunctionType())
2951 adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);
2952
2953 return Context.getMemberPointerType(T, Class.getTypePtr());
2954 }
2955
2956 /// Build a block pointer type.
2957 ///
2958 /// \param T The type to which we'll be building a block pointer.
2959 ///
2960 /// \param Loc The source location, used for diagnostics.
2961 ///
2962 /// \param Entity The name of the entity that involves the block pointer
2963 /// type, if known.
2964 ///
2965 /// \returns A suitable block pointer type, if there are no
2966 /// errors. Otherwise, returns a NULL type.
BuildBlockPointerType(QualType T,SourceLocation Loc,DeclarationName Entity)2967 QualType Sema::BuildBlockPointerType(QualType T,
2968 SourceLocation Loc,
2969 DeclarationName Entity) {
2970 if (!T->isFunctionType()) {
2971 Diag(Loc, diag::err_nonfunction_block_type);
2972 return QualType();
2973 }
2974
2975 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
2976 return QualType();
2977
2978 if (getLangOpts().OpenCL)
2979 T = deduceOpenCLPointeeAddrSpace(*this, T);
2980
2981 return Context.getBlockPointerType(T);
2982 }
2983
GetTypeFromParser(ParsedType Ty,TypeSourceInfo ** TInfo)2984 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
2985 QualType QT = Ty.get();
2986 if (QT.isNull()) {
2987 if (TInfo) *TInfo = nullptr;
2988 return QualType();
2989 }
2990
2991 TypeSourceInfo *DI = nullptr;
2992 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
2993 QT = LIT->getType();
2994 DI = LIT->getTypeSourceInfo();
2995 }
2996
2997 if (TInfo) *TInfo = DI;
2998 return QT;
2999 }
3000
3001 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
3002 Qualifiers::ObjCLifetime ownership,
3003 unsigned chunkIndex);
3004
3005 /// Given that this is the declaration of a parameter under ARC,
3006 /// attempt to infer attributes and such for pointer-to-whatever
3007 /// types.
inferARCWriteback(TypeProcessingState & state,QualType & declSpecType)3008 static void inferARCWriteback(TypeProcessingState &state,
3009 QualType &declSpecType) {
3010 Sema &S = state.getSema();
3011 Declarator &declarator = state.getDeclarator();
3012
3013 // TODO: should we care about decl qualifiers?
3014
3015 // Check whether the declarator has the expected form. We walk
3016 // from the inside out in order to make the block logic work.
3017 unsigned outermostPointerIndex = 0;
3018 bool isBlockPointer = false;
3019 unsigned numPointers = 0;
3020 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
3021 unsigned chunkIndex = i;
3022 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
3023 switch (chunk.Kind) {
3024 case DeclaratorChunk::Paren:
3025 // Ignore parens.
3026 break;
3027
3028 case DeclaratorChunk::Reference:
3029 case DeclaratorChunk::Pointer:
3030 // Count the number of pointers. Treat references
3031 // interchangeably as pointers; if they're mis-ordered, normal
3032 // type building will discover that.
3033 outermostPointerIndex = chunkIndex;
3034 numPointers++;
3035 break;
3036
3037 case DeclaratorChunk::BlockPointer:
3038 // If we have a pointer to block pointer, that's an acceptable
3039 // indirect reference; anything else is not an application of
3040 // the rules.
3041 if (numPointers != 1) return;
3042 numPointers++;
3043 outermostPointerIndex = chunkIndex;
3044 isBlockPointer = true;
3045
3046 // We don't care about pointer structure in return values here.
3047 goto done;
3048
3049 case DeclaratorChunk::Array: // suppress if written (id[])?
3050 case DeclaratorChunk::Function:
3051 case DeclaratorChunk::MemberPointer:
3052 case DeclaratorChunk::Pipe:
3053 return;
3054 }
3055 }
3056 done:
3057
3058 // If we have *one* pointer, then we want to throw the qualifier on
3059 // the declaration-specifiers, which means that it needs to be a
3060 // retainable object type.
3061 if (numPointers == 1) {
3062 // If it's not a retainable object type, the rule doesn't apply.
3063 if (!declSpecType->isObjCRetainableType()) return;
3064
3065 // If it already has lifetime, don't do anything.
3066 if (declSpecType.getObjCLifetime()) return;
3067
3068 // Otherwise, modify the type in-place.
3069 Qualifiers qs;
3070
3071 if (declSpecType->isObjCARCImplicitlyUnretainedType())
3072 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
3073 else
3074 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
3075 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
3076
3077 // If we have *two* pointers, then we want to throw the qualifier on
3078 // the outermost pointer.
3079 } else if (numPointers == 2) {
3080 // If we don't have a block pointer, we need to check whether the
3081 // declaration-specifiers gave us something that will turn into a
3082 // retainable object pointer after we slap the first pointer on it.
3083 if (!isBlockPointer && !declSpecType->isObjCObjectType())
3084 return;
3085
3086 // Look for an explicit lifetime attribute there.
3087 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
3088 if (chunk.Kind != DeclaratorChunk::Pointer &&
3089 chunk.Kind != DeclaratorChunk::BlockPointer)
3090 return;
3091 for (const ParsedAttr &AL : chunk.getAttrs())
3092 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership)
3093 return;
3094
3095 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
3096 outermostPointerIndex);
3097
3098 // Any other number of pointers/references does not trigger the rule.
3099 } else return;
3100
3101 // TODO: mark whether we did this inference?
3102 }
3103
diagnoseIgnoredQualifiers(unsigned DiagID,unsigned Quals,SourceLocation FallbackLoc,SourceLocation ConstQualLoc,SourceLocation VolatileQualLoc,SourceLocation RestrictQualLoc,SourceLocation AtomicQualLoc,SourceLocation UnalignedQualLoc)3104 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
3105 SourceLocation FallbackLoc,
3106 SourceLocation ConstQualLoc,
3107 SourceLocation VolatileQualLoc,
3108 SourceLocation RestrictQualLoc,
3109 SourceLocation AtomicQualLoc,
3110 SourceLocation UnalignedQualLoc) {
3111 if (!Quals)
3112 return;
3113
3114 struct Qual {
3115 const char *Name;
3116 unsigned Mask;
3117 SourceLocation Loc;
3118 } const QualKinds[5] = {
3119 { "const", DeclSpec::TQ_const, ConstQualLoc },
3120 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
3121 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
3122 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
3123 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
3124 };
3125
3126 SmallString<32> QualStr;
3127 unsigned NumQuals = 0;
3128 SourceLocation Loc;
3129 FixItHint FixIts[5];
3130
3131 // Build a string naming the redundant qualifiers.
3132 for (auto &E : QualKinds) {
3133 if (Quals & E.Mask) {
3134 if (!QualStr.empty()) QualStr += ' ';
3135 QualStr += E.Name;
3136
3137 // If we have a location for the qualifier, offer a fixit.
3138 SourceLocation QualLoc = E.Loc;
3139 if (QualLoc.isValid()) {
3140 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
3141 if (Loc.isInvalid() ||
3142 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
3143 Loc = QualLoc;
3144 }
3145
3146 ++NumQuals;
3147 }
3148 }
3149
3150 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
3151 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
3152 }
3153
3154 // Diagnose pointless type qualifiers on the return type of a function.
diagnoseRedundantReturnTypeQualifiers(Sema & S,QualType RetTy,Declarator & D,unsigned FunctionChunkIndex)3155 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
3156 Declarator &D,
3157 unsigned FunctionChunkIndex) {
3158 const DeclaratorChunk::FunctionTypeInfo &FTI =
3159 D.getTypeObject(FunctionChunkIndex).Fun;
3160 if (FTI.hasTrailingReturnType()) {
3161 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3162 RetTy.getLocalCVRQualifiers(),
3163 FTI.getTrailingReturnTypeLoc());
3164 return;
3165 }
3166
3167 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
3168 End = D.getNumTypeObjects();
3169 OuterChunkIndex != End; ++OuterChunkIndex) {
3170 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
3171 switch (OuterChunk.Kind) {
3172 case DeclaratorChunk::Paren:
3173 continue;
3174
3175 case DeclaratorChunk::Pointer: {
3176 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
3177 S.diagnoseIgnoredQualifiers(
3178 diag::warn_qual_return_type,
3179 PTI.TypeQuals,
3180 SourceLocation(),
3181 PTI.ConstQualLoc,
3182 PTI.VolatileQualLoc,
3183 PTI.RestrictQualLoc,
3184 PTI.AtomicQualLoc,
3185 PTI.UnalignedQualLoc);
3186 return;
3187 }
3188
3189 case DeclaratorChunk::Function:
3190 case DeclaratorChunk::BlockPointer:
3191 case DeclaratorChunk::Reference:
3192 case DeclaratorChunk::Array:
3193 case DeclaratorChunk::MemberPointer:
3194 case DeclaratorChunk::Pipe:
3195 // FIXME: We can't currently provide an accurate source location and a
3196 // fix-it hint for these.
3197 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
3198 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3199 RetTy.getCVRQualifiers() | AtomicQual,
3200 D.getIdentifierLoc());
3201 return;
3202 }
3203
3204 llvm_unreachable("unknown declarator chunk kind");
3205 }
3206
3207 // If the qualifiers come from a conversion function type, don't diagnose
3208 // them -- they're not necessarily redundant, since such a conversion
3209 // operator can be explicitly called as "x.operator const int()".
3210 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3211 return;
3212
3213 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
3214 // which are present there.
3215 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3216 D.getDeclSpec().getTypeQualifiers(),
3217 D.getIdentifierLoc(),
3218 D.getDeclSpec().getConstSpecLoc(),
3219 D.getDeclSpec().getVolatileSpecLoc(),
3220 D.getDeclSpec().getRestrictSpecLoc(),
3221 D.getDeclSpec().getAtomicSpecLoc(),
3222 D.getDeclSpec().getUnalignedSpecLoc());
3223 }
3224
3225 static std::pair<QualType, TypeSourceInfo *>
InventTemplateParameter(TypeProcessingState & state,QualType T,TypeSourceInfo * TrailingTSI,AutoType * Auto,InventedTemplateParameterInfo & Info)3226 InventTemplateParameter(TypeProcessingState &state, QualType T,
3227 TypeSourceInfo *TrailingTSI, AutoType *Auto,
3228 InventedTemplateParameterInfo &Info) {
3229 Sema &S = state.getSema();
3230 Declarator &D = state.getDeclarator();
3231
3232 const unsigned TemplateParameterDepth = Info.AutoTemplateParameterDepth;
3233 const unsigned AutoParameterPosition = Info.TemplateParams.size();
3234 const bool IsParameterPack = D.hasEllipsis();
3235
3236 // If auto is mentioned in a lambda parameter or abbreviated function
3237 // template context, convert it to a template parameter type.
3238
3239 // Create the TemplateTypeParmDecl here to retrieve the corresponding
3240 // template parameter type. Template parameters are temporarily added
3241 // to the TU until the associated TemplateDecl is created.
3242 TemplateTypeParmDecl *InventedTemplateParam =
3243 TemplateTypeParmDecl::Create(
3244 S.Context, S.Context.getTranslationUnitDecl(),
3245 /*KeyLoc=*/D.getDeclSpec().getTypeSpecTypeLoc(),
3246 /*NameLoc=*/D.getIdentifierLoc(),
3247 TemplateParameterDepth, AutoParameterPosition,
3248 S.InventAbbreviatedTemplateParameterTypeName(
3249 D.getIdentifier(), AutoParameterPosition), false,
3250 IsParameterPack, /*HasTypeConstraint=*/Auto->isConstrained());
3251 InventedTemplateParam->setImplicit();
3252 Info.TemplateParams.push_back(InventedTemplateParam);
3253
3254 // Attach type constraints to the new parameter.
3255 if (Auto->isConstrained()) {
3256 if (TrailingTSI) {
3257 // The 'auto' appears in a trailing return type we've already built;
3258 // extract its type constraints to attach to the template parameter.
3259 AutoTypeLoc AutoLoc = TrailingTSI->getTypeLoc().getContainedAutoTypeLoc();
3260 TemplateArgumentListInfo TAL(AutoLoc.getLAngleLoc(), AutoLoc.getRAngleLoc());
3261 bool Invalid = false;
3262 for (unsigned Idx = 0; Idx < AutoLoc.getNumArgs(); ++Idx) {
3263 if (D.getEllipsisLoc().isInvalid() && !Invalid &&
3264 S.DiagnoseUnexpandedParameterPack(AutoLoc.getArgLoc(Idx),
3265 Sema::UPPC_TypeConstraint))
3266 Invalid = true;
3267 TAL.addArgument(AutoLoc.getArgLoc(Idx));
3268 }
3269
3270 if (!Invalid) {
3271 S.AttachTypeConstraint(
3272 AutoLoc.getNestedNameSpecifierLoc(), AutoLoc.getConceptNameInfo(),
3273 AutoLoc.getNamedConcept(),
3274 AutoLoc.hasExplicitTemplateArgs() ? &TAL : nullptr,
3275 InventedTemplateParam, D.getEllipsisLoc());
3276 }
3277 } else {
3278 // The 'auto' appears in the decl-specifiers; we've not finished forming
3279 // TypeSourceInfo for it yet.
3280 TemplateIdAnnotation *TemplateId = D.getDeclSpec().getRepAsTemplateId();
3281 TemplateArgumentListInfo TemplateArgsInfo;
3282 bool Invalid = false;
3283 if (TemplateId->LAngleLoc.isValid()) {
3284 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
3285 TemplateId->NumArgs);
3286 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
3287
3288 if (D.getEllipsisLoc().isInvalid()) {
3289 for (TemplateArgumentLoc Arg : TemplateArgsInfo.arguments()) {
3290 if (S.DiagnoseUnexpandedParameterPack(Arg,
3291 Sema::UPPC_TypeConstraint)) {
3292 Invalid = true;
3293 break;
3294 }
3295 }
3296 }
3297 }
3298 if (!Invalid) {
3299 S.AttachTypeConstraint(
3300 D.getDeclSpec().getTypeSpecScope().getWithLocInContext(S.Context),
3301 DeclarationNameInfo(DeclarationName(TemplateId->Name),
3302 TemplateId->TemplateNameLoc),
3303 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl()),
3304 TemplateId->LAngleLoc.isValid() ? &TemplateArgsInfo : nullptr,
3305 InventedTemplateParam, D.getEllipsisLoc());
3306 }
3307 }
3308 }
3309
3310 // Replace the 'auto' in the function parameter with this invented
3311 // template type parameter.
3312 // FIXME: Retain some type sugar to indicate that this was written
3313 // as 'auto'?
3314 QualType Replacement(InventedTemplateParam->getTypeForDecl(), 0);
3315 QualType NewT = state.ReplaceAutoType(T, Replacement);
3316 TypeSourceInfo *NewTSI =
3317 TrailingTSI ? S.ReplaceAutoTypeSourceInfo(TrailingTSI, Replacement)
3318 : nullptr;
3319 return {NewT, NewTSI};
3320 }
3321
3322 static TypeSourceInfo *
3323 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
3324 QualType T, TypeSourceInfo *ReturnTypeInfo);
3325
GetDeclSpecTypeForDeclarator(TypeProcessingState & state,TypeSourceInfo * & ReturnTypeInfo)3326 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
3327 TypeSourceInfo *&ReturnTypeInfo) {
3328 Sema &SemaRef = state.getSema();
3329 Declarator &D = state.getDeclarator();
3330 QualType T;
3331 ReturnTypeInfo = nullptr;
3332
3333 // The TagDecl owned by the DeclSpec.
3334 TagDecl *OwnedTagDecl = nullptr;
3335
3336 switch (D.getName().getKind()) {
3337 case UnqualifiedIdKind::IK_ImplicitSelfParam:
3338 case UnqualifiedIdKind::IK_OperatorFunctionId:
3339 case UnqualifiedIdKind::IK_Identifier:
3340 case UnqualifiedIdKind::IK_LiteralOperatorId:
3341 case UnqualifiedIdKind::IK_TemplateId:
3342 T = ConvertDeclSpecToType(state);
3343
3344 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
3345 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
3346 // Owned declaration is embedded in declarator.
3347 OwnedTagDecl->setEmbeddedInDeclarator(true);
3348 }
3349 break;
3350
3351 case UnqualifiedIdKind::IK_ConstructorName:
3352 case UnqualifiedIdKind::IK_ConstructorTemplateId:
3353 case UnqualifiedIdKind::IK_DestructorName:
3354 // Constructors and destructors don't have return types. Use
3355 // "void" instead.
3356 T = SemaRef.Context.VoidTy;
3357 processTypeAttrs(state, T, TAL_DeclSpec,
3358 D.getMutableDeclSpec().getAttributes());
3359 break;
3360
3361 case UnqualifiedIdKind::IK_DeductionGuideName:
3362 // Deduction guides have a trailing return type and no type in their
3363 // decl-specifier sequence. Use a placeholder return type for now.
3364 T = SemaRef.Context.DependentTy;
3365 break;
3366
3367 case UnqualifiedIdKind::IK_ConversionFunctionId:
3368 // The result type of a conversion function is the type that it
3369 // converts to.
3370 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
3371 &ReturnTypeInfo);
3372 break;
3373 }
3374
3375 if (!D.getAttributes().empty())
3376 distributeTypeAttrsFromDeclarator(state, T);
3377
3378 // Find the deduced type in this type. Look in the trailing return type if we
3379 // have one, otherwise in the DeclSpec type.
3380 // FIXME: The standard wording doesn't currently describe this.
3381 DeducedType *Deduced = T->getContainedDeducedType();
3382 bool DeducedIsTrailingReturnType = false;
3383 if (Deduced && isa<AutoType>(Deduced) && D.hasTrailingReturnType()) {
3384 QualType T = SemaRef.GetTypeFromParser(D.getTrailingReturnType());
3385 Deduced = T.isNull() ? nullptr : T->getContainedDeducedType();
3386 DeducedIsTrailingReturnType = true;
3387 }
3388
3389 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
3390 if (Deduced) {
3391 AutoType *Auto = dyn_cast<AutoType>(Deduced);
3392 int Error = -1;
3393
3394 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
3395 // class template argument deduction)?
3396 bool IsCXXAutoType =
3397 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
3398 bool IsDeducedReturnType = false;
3399
3400 switch (D.getContext()) {
3401 case DeclaratorContext::LambdaExpr:
3402 // Declared return type of a lambda-declarator is implicit and is always
3403 // 'auto'.
3404 break;
3405 case DeclaratorContext::ObjCParameter:
3406 case DeclaratorContext::ObjCResult:
3407 Error = 0;
3408 break;
3409 case DeclaratorContext::RequiresExpr:
3410 Error = 22;
3411 break;
3412 case DeclaratorContext::Prototype:
3413 case DeclaratorContext::LambdaExprParameter: {
3414 InventedTemplateParameterInfo *Info = nullptr;
3415 if (D.getContext() == DeclaratorContext::Prototype) {
3416 // With concepts we allow 'auto' in function parameters.
3417 if (!SemaRef.getLangOpts().CPlusPlus20 || !Auto ||
3418 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3419 Error = 0;
3420 break;
3421 } else if (!SemaRef.getCurScope()->isFunctionDeclarationScope()) {
3422 Error = 21;
3423 break;
3424 }
3425
3426 Info = &SemaRef.InventedParameterInfos.back();
3427 } else {
3428 // In C++14, generic lambdas allow 'auto' in their parameters.
3429 if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto ||
3430 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3431 Error = 16;
3432 break;
3433 }
3434 Info = SemaRef.getCurLambda();
3435 assert(Info && "No LambdaScopeInfo on the stack!");
3436 }
3437
3438 // We'll deal with inventing template parameters for 'auto' in trailing
3439 // return types when we pick up the trailing return type when processing
3440 // the function chunk.
3441 if (!DeducedIsTrailingReturnType)
3442 T = InventTemplateParameter(state, T, nullptr, Auto, *Info).first;
3443 break;
3444 }
3445 case DeclaratorContext::Member: {
3446 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
3447 D.isFunctionDeclarator())
3448 break;
3449 bool Cxx = SemaRef.getLangOpts().CPlusPlus;
3450 if (isa<ObjCContainerDecl>(SemaRef.CurContext)) {
3451 Error = 6; // Interface member.
3452 } else {
3453 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
3454 case TTK_Enum: llvm_unreachable("unhandled tag kind");
3455 case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break;
3456 case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break;
3457 case TTK_Class: Error = 5; /* Class member */ break;
3458 case TTK_Interface: Error = 6; /* Interface member */ break;
3459 }
3460 }
3461 if (D.getDeclSpec().isFriendSpecified())
3462 Error = 20; // Friend type
3463 break;
3464 }
3465 case DeclaratorContext::CXXCatch:
3466 case DeclaratorContext::ObjCCatch:
3467 Error = 7; // Exception declaration
3468 break;
3469 case DeclaratorContext::TemplateParam:
3470 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3471 !SemaRef.getLangOpts().CPlusPlus20)
3472 Error = 19; // Template parameter (until C++20)
3473 else if (!SemaRef.getLangOpts().CPlusPlus17)
3474 Error = 8; // Template parameter (until C++17)
3475 break;
3476 case DeclaratorContext::BlockLiteral:
3477 Error = 9; // Block literal
3478 break;
3479 case DeclaratorContext::TemplateArg:
3480 // Within a template argument list, a deduced template specialization
3481 // type will be reinterpreted as a template template argument.
3482 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3483 !D.getNumTypeObjects() &&
3484 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier)
3485 break;
3486 LLVM_FALLTHROUGH;
3487 case DeclaratorContext::TemplateTypeArg:
3488 Error = 10; // Template type argument
3489 break;
3490 case DeclaratorContext::AliasDecl:
3491 case DeclaratorContext::AliasTemplate:
3492 Error = 12; // Type alias
3493 break;
3494 case DeclaratorContext::TrailingReturn:
3495 case DeclaratorContext::TrailingReturnVar:
3496 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3497 Error = 13; // Function return type
3498 IsDeducedReturnType = true;
3499 break;
3500 case DeclaratorContext::ConversionId:
3501 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3502 Error = 14; // conversion-type-id
3503 IsDeducedReturnType = true;
3504 break;
3505 case DeclaratorContext::FunctionalCast:
3506 if (isa<DeducedTemplateSpecializationType>(Deduced))
3507 break;
3508 LLVM_FALLTHROUGH;
3509 case DeclaratorContext::TypeName:
3510 Error = 15; // Generic
3511 break;
3512 case DeclaratorContext::File:
3513 case DeclaratorContext::Block:
3514 case DeclaratorContext::ForInit:
3515 case DeclaratorContext::SelectionInit:
3516 case DeclaratorContext::Condition:
3517 // FIXME: P0091R3 (erroneously) does not permit class template argument
3518 // deduction in conditions, for-init-statements, and other declarations
3519 // that are not simple-declarations.
3520 break;
3521 case DeclaratorContext::CXXNew:
3522 // FIXME: P0091R3 does not permit class template argument deduction here,
3523 // but we follow GCC and allow it anyway.
3524 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
3525 Error = 17; // 'new' type
3526 break;
3527 case DeclaratorContext::KNRTypeList:
3528 Error = 18; // K&R function parameter
3529 break;
3530 }
3531
3532 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3533 Error = 11;
3534
3535 // In Objective-C it is an error to use 'auto' on a function declarator
3536 // (and everywhere for '__auto_type').
3537 if (D.isFunctionDeclarator() &&
3538 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
3539 Error = 13;
3540
3541 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
3542 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3543 AutoRange = D.getName().getSourceRange();
3544
3545 if (Error != -1) {
3546 unsigned Kind;
3547 if (Auto) {
3548 switch (Auto->getKeyword()) {
3549 case AutoTypeKeyword::Auto: Kind = 0; break;
3550 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
3551 case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
3552 }
3553 } else {
3554 assert(isa<DeducedTemplateSpecializationType>(Deduced) &&
3555 "unknown auto type");
3556 Kind = 3;
3557 }
3558
3559 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
3560 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();
3561
3562 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
3563 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
3564 << QualType(Deduced, 0) << AutoRange;
3565 if (auto *TD = TN.getAsTemplateDecl())
3566 SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here);
3567
3568 T = SemaRef.Context.IntTy;
3569 D.setInvalidType(true);
3570 } else if (Auto && D.getContext() != DeclaratorContext::LambdaExpr) {
3571 // If there was a trailing return type, we already got
3572 // warn_cxx98_compat_trailing_return_type in the parser.
3573 SemaRef.Diag(AutoRange.getBegin(),
3574 D.getContext() == DeclaratorContext::LambdaExprParameter
3575 ? diag::warn_cxx11_compat_generic_lambda
3576 : IsDeducedReturnType
3577 ? diag::warn_cxx11_compat_deduced_return_type
3578 : diag::warn_cxx98_compat_auto_type_specifier)
3579 << AutoRange;
3580 }
3581 }
3582
3583 if (SemaRef.getLangOpts().CPlusPlus &&
3584 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
3585 // Check the contexts where C++ forbids the declaration of a new class
3586 // or enumeration in a type-specifier-seq.
3587 unsigned DiagID = 0;
3588 switch (D.getContext()) {
3589 case DeclaratorContext::TrailingReturn:
3590 case DeclaratorContext::TrailingReturnVar:
3591 // Class and enumeration definitions are syntactically not allowed in
3592 // trailing return types.
3593 llvm_unreachable("parser should not have allowed this");
3594 break;
3595 case DeclaratorContext::File:
3596 case DeclaratorContext::Member:
3597 case DeclaratorContext::Block:
3598 case DeclaratorContext::ForInit:
3599 case DeclaratorContext::SelectionInit:
3600 case DeclaratorContext::BlockLiteral:
3601 case DeclaratorContext::LambdaExpr:
3602 // C++11 [dcl.type]p3:
3603 // A type-specifier-seq shall not define a class or enumeration unless
3604 // it appears in the type-id of an alias-declaration (7.1.3) that is not
3605 // the declaration of a template-declaration.
3606 case DeclaratorContext::AliasDecl:
3607 break;
3608 case DeclaratorContext::AliasTemplate:
3609 DiagID = diag::err_type_defined_in_alias_template;
3610 break;
3611 case DeclaratorContext::TypeName:
3612 case DeclaratorContext::FunctionalCast:
3613 case DeclaratorContext::ConversionId:
3614 case DeclaratorContext::TemplateParam:
3615 case DeclaratorContext::CXXNew:
3616 case DeclaratorContext::CXXCatch:
3617 case DeclaratorContext::ObjCCatch:
3618 case DeclaratorContext::TemplateArg:
3619 case DeclaratorContext::TemplateTypeArg:
3620 DiagID = diag::err_type_defined_in_type_specifier;
3621 break;
3622 case DeclaratorContext::Prototype:
3623 case DeclaratorContext::LambdaExprParameter:
3624 case DeclaratorContext::ObjCParameter:
3625 case DeclaratorContext::ObjCResult:
3626 case DeclaratorContext::KNRTypeList:
3627 case DeclaratorContext::RequiresExpr:
3628 // C++ [dcl.fct]p6:
3629 // Types shall not be defined in return or parameter types.
3630 DiagID = diag::err_type_defined_in_param_type;
3631 break;
3632 case DeclaratorContext::Condition:
3633 // C++ 6.4p2:
3634 // The type-specifier-seq shall not contain typedef and shall not declare
3635 // a new class or enumeration.
3636 DiagID = diag::err_type_defined_in_condition;
3637 break;
3638 }
3639
3640 if (DiagID != 0) {
3641 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
3642 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
3643 D.setInvalidType(true);
3644 }
3645 }
3646
3647 assert(!T.isNull() && "This function should not return a null type");
3648 return T;
3649 }
3650
3651 /// Produce an appropriate diagnostic for an ambiguity between a function
3652 /// declarator and a C++ direct-initializer.
warnAboutAmbiguousFunction(Sema & S,Declarator & D,DeclaratorChunk & DeclType,QualType RT)3653 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
3654 DeclaratorChunk &DeclType, QualType RT) {
3655 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
3656 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity");
3657
3658 // If the return type is void there is no ambiguity.
3659 if (RT->isVoidType())
3660 return;
3661
3662 // An initializer for a non-class type can have at most one argument.
3663 if (!RT->isRecordType() && FTI.NumParams > 1)
3664 return;
3665
3666 // An initializer for a reference must have exactly one argument.
3667 if (RT->isReferenceType() && FTI.NumParams != 1)
3668 return;
3669
3670 // Only warn if this declarator is declaring a function at block scope, and
3671 // doesn't have a storage class (such as 'extern') specified.
3672 if (!D.isFunctionDeclarator() ||
3673 D.getFunctionDefinitionKind() != FunctionDefinitionKind::Declaration ||
3674 !S.CurContext->isFunctionOrMethod() ||
3675 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_unspecified)
3676 return;
3677
3678 // Inside a condition, a direct initializer is not permitted. We allow one to
3679 // be parsed in order to give better diagnostics in condition parsing.
3680 if (D.getContext() == DeclaratorContext::Condition)
3681 return;
3682
3683 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
3684
3685 S.Diag(DeclType.Loc,
3686 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
3687 : diag::warn_empty_parens_are_function_decl)
3688 << ParenRange;
3689
3690 // If the declaration looks like:
3691 // T var1,
3692 // f();
3693 // and name lookup finds a function named 'f', then the ',' was
3694 // probably intended to be a ';'.
3695 if (!D.isFirstDeclarator() && D.getIdentifier()) {
3696 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
3697 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
3698 if (Comma.getFileID() != Name.getFileID() ||
3699 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
3700 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3701 Sema::LookupOrdinaryName);
3702 if (S.LookupName(Result, S.getCurScope()))
3703 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
3704 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
3705 << D.getIdentifier();
3706 Result.suppressDiagnostics();
3707 }
3708 }
3709
3710 if (FTI.NumParams > 0) {
3711 // For a declaration with parameters, eg. "T var(T());", suggest adding
3712 // parens around the first parameter to turn the declaration into a
3713 // variable declaration.
3714 SourceRange Range = FTI.Params[0].Param->getSourceRange();
3715 SourceLocation B = Range.getBegin();
3716 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
3717 // FIXME: Maybe we should suggest adding braces instead of parens
3718 // in C++11 for classes that don't have an initializer_list constructor.
3719 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
3720 << FixItHint::CreateInsertion(B, "(")
3721 << FixItHint::CreateInsertion(E, ")");
3722 } else {
3723 // For a declaration without parameters, eg. "T var();", suggest replacing
3724 // the parens with an initializer to turn the declaration into a variable
3725 // declaration.
3726 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
3727
3728 // Empty parens mean value-initialization, and no parens mean
3729 // default initialization. These are equivalent if the default
3730 // constructor is user-provided or if zero-initialization is a
3731 // no-op.
3732 if (RD && RD->hasDefinition() &&
3733 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
3734 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
3735 << FixItHint::CreateRemoval(ParenRange);
3736 else {
3737 std::string Init =
3738 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
3739 if (Init.empty() && S.LangOpts.CPlusPlus11)
3740 Init = "{}";
3741 if (!Init.empty())
3742 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
3743 << FixItHint::CreateReplacement(ParenRange, Init);
3744 }
3745 }
3746 }
3747
3748 /// Produce an appropriate diagnostic for a declarator with top-level
3749 /// parentheses.
warnAboutRedundantParens(Sema & S,Declarator & D,QualType T)3750 static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) {
3751 DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1);
3752 assert(Paren.Kind == DeclaratorChunk::Paren &&
3753 "do not have redundant top-level parentheses");
3754
3755 // This is a syntactic check; we're not interested in cases that arise
3756 // during template instantiation.
3757 if (S.inTemplateInstantiation())
3758 return;
3759
3760 // Check whether this could be intended to be a construction of a temporary
3761 // object in C++ via a function-style cast.
3762 bool CouldBeTemporaryObject =
3763 S.getLangOpts().CPlusPlus && D.isExpressionContext() &&
3764 !D.isInvalidType() && D.getIdentifier() &&
3765 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier &&
3766 (T->isRecordType() || T->isDependentType()) &&
3767 D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator();
3768
3769 bool StartsWithDeclaratorId = true;
3770 for (auto &C : D.type_objects()) {
3771 switch (C.Kind) {
3772 case DeclaratorChunk::Paren:
3773 if (&C == &Paren)
3774 continue;
3775 LLVM_FALLTHROUGH;
3776 case DeclaratorChunk::Pointer:
3777 StartsWithDeclaratorId = false;
3778 continue;
3779
3780 case DeclaratorChunk::Array:
3781 if (!C.Arr.NumElts)
3782 CouldBeTemporaryObject = false;
3783 continue;
3784
3785 case DeclaratorChunk::Reference:
3786 // FIXME: Suppress the warning here if there is no initializer; we're
3787 // going to give an error anyway.
3788 // We assume that something like 'T (&x) = y;' is highly likely to not
3789 // be intended to be a temporary object.
3790 CouldBeTemporaryObject = false;
3791 StartsWithDeclaratorId = false;
3792 continue;
3793
3794 case DeclaratorChunk::Function:
3795 // In a new-type-id, function chunks require parentheses.
3796 if (D.getContext() == DeclaratorContext::CXXNew)
3797 return;
3798 // FIXME: "A(f())" deserves a vexing-parse warning, not just a
3799 // redundant-parens warning, but we don't know whether the function
3800 // chunk was syntactically valid as an expression here.
3801 CouldBeTemporaryObject = false;
3802 continue;
3803
3804 case DeclaratorChunk::BlockPointer:
3805 case DeclaratorChunk::MemberPointer:
3806 case DeclaratorChunk::Pipe:
3807 // These cannot appear in expressions.
3808 CouldBeTemporaryObject = false;
3809 StartsWithDeclaratorId = false;
3810 continue;
3811 }
3812 }
3813
3814 // FIXME: If there is an initializer, assume that this is not intended to be
3815 // a construction of a temporary object.
3816
3817 // Check whether the name has already been declared; if not, this is not a
3818 // function-style cast.
3819 if (CouldBeTemporaryObject) {
3820 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3821 Sema::LookupOrdinaryName);
3822 if (!S.LookupName(Result, S.getCurScope()))
3823 CouldBeTemporaryObject = false;
3824 Result.suppressDiagnostics();
3825 }
3826
3827 SourceRange ParenRange(Paren.Loc, Paren.EndLoc);
3828
3829 if (!CouldBeTemporaryObject) {
3830 // If we have A (::B), the parentheses affect the meaning of the program.
3831 // Suppress the warning in that case. Don't bother looking at the DeclSpec
3832 // here: even (e.g.) "int ::x" is visually ambiguous even though it's
3833 // formally unambiguous.
3834 if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) {
3835 for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS;
3836 NNS = NNS->getPrefix()) {
3837 if (NNS->getKind() == NestedNameSpecifier::Global)
3838 return;
3839 }
3840 }
3841
3842 S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator)
3843 << ParenRange << FixItHint::CreateRemoval(Paren.Loc)
3844 << FixItHint::CreateRemoval(Paren.EndLoc);
3845 return;
3846 }
3847
3848 S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration)
3849 << ParenRange << D.getIdentifier();
3850 auto *RD = T->getAsCXXRecordDecl();
3851 if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor())
3852 S.Diag(Paren.Loc, diag::note_raii_guard_add_name)
3853 << FixItHint::CreateInsertion(Paren.Loc, " varname") << T
3854 << D.getIdentifier();
3855 // FIXME: A cast to void is probably a better suggestion in cases where it's
3856 // valid (when there is no initializer and we're not in a condition).
3857 S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses)
3858 << FixItHint::CreateInsertion(D.getBeginLoc(), "(")
3859 << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")");
3860 S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration)
3861 << FixItHint::CreateRemoval(Paren.Loc)
3862 << FixItHint::CreateRemoval(Paren.EndLoc);
3863 }
3864
3865 /// Helper for figuring out the default CC for a function declarator type. If
3866 /// this is the outermost chunk, then we can determine the CC from the
3867 /// declarator context. If not, then this could be either a member function
3868 /// type or normal function type.
getCCForDeclaratorChunk(Sema & S,Declarator & D,const ParsedAttributesView & AttrList,const DeclaratorChunk::FunctionTypeInfo & FTI,unsigned ChunkIndex)3869 static CallingConv getCCForDeclaratorChunk(
3870 Sema &S, Declarator &D, const ParsedAttributesView &AttrList,
3871 const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) {
3872 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function);
3873
3874 // Check for an explicit CC attribute.
3875 for (const ParsedAttr &AL : AttrList) {
3876 switch (AL.getKind()) {
3877 CALLING_CONV_ATTRS_CASELIST : {
3878 // Ignore attributes that don't validate or can't apply to the
3879 // function type. We'll diagnose the failure to apply them in
3880 // handleFunctionTypeAttr.
3881 CallingConv CC;
3882 if (!S.CheckCallingConvAttr(AL, CC) &&
3883 (!FTI.isVariadic || supportsVariadicCall(CC))) {
3884 return CC;
3885 }
3886 break;
3887 }
3888
3889 default:
3890 break;
3891 }
3892 }
3893
3894 bool IsCXXInstanceMethod = false;
3895
3896 if (S.getLangOpts().CPlusPlus) {
3897 // Look inwards through parentheses to see if this chunk will form a
3898 // member pointer type or if we're the declarator. Any type attributes
3899 // between here and there will override the CC we choose here.
3900 unsigned I = ChunkIndex;
3901 bool FoundNonParen = false;
3902 while (I && !FoundNonParen) {
3903 --I;
3904 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
3905 FoundNonParen = true;
3906 }
3907
3908 if (FoundNonParen) {
3909 // If we're not the declarator, we're a regular function type unless we're
3910 // in a member pointer.
3911 IsCXXInstanceMethod =
3912 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
3913 } else if (D.getContext() == DeclaratorContext::LambdaExpr) {
3914 // This can only be a call operator for a lambda, which is an instance
3915 // method.
3916 IsCXXInstanceMethod = true;
3917 } else {
3918 // We're the innermost decl chunk, so must be a function declarator.
3919 assert(D.isFunctionDeclarator());
3920
3921 // If we're inside a record, we're declaring a method, but it could be
3922 // explicitly or implicitly static.
3923 IsCXXInstanceMethod =
3924 D.isFirstDeclarationOfMember() &&
3925 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
3926 !D.isStaticMember();
3927 }
3928 }
3929
3930 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
3931 IsCXXInstanceMethod);
3932
3933 // Attribute AT_OpenCLKernel affects the calling convention for SPIR
3934 // and AMDGPU targets, hence it cannot be treated as a calling
3935 // convention attribute. This is the simplest place to infer
3936 // calling convention for OpenCL kernels.
3937 if (S.getLangOpts().OpenCL) {
3938 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
3939 if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) {
3940 CC = CC_OpenCLKernel;
3941 break;
3942 }
3943 }
3944 }
3945
3946 return CC;
3947 }
3948
3949 namespace {
3950 /// A simple notion of pointer kinds, which matches up with the various
3951 /// pointer declarators.
3952 enum class SimplePointerKind {
3953 Pointer,
3954 BlockPointer,
3955 MemberPointer,
3956 Array,
3957 };
3958 } // end anonymous namespace
3959
getNullabilityKeyword(NullabilityKind nullability)3960 IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
3961 switch (nullability) {
3962 case NullabilityKind::NonNull:
3963 if (!Ident__Nonnull)
3964 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
3965 return Ident__Nonnull;
3966
3967 case NullabilityKind::Nullable:
3968 if (!Ident__Nullable)
3969 Ident__Nullable = PP.getIdentifierInfo("_Nullable");
3970 return Ident__Nullable;
3971
3972 case NullabilityKind::NullableResult:
3973 if (!Ident__Nullable_result)
3974 Ident__Nullable_result = PP.getIdentifierInfo("_Nullable_result");
3975 return Ident__Nullable_result;
3976
3977 case NullabilityKind::Unspecified:
3978 if (!Ident__Null_unspecified)
3979 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
3980 return Ident__Null_unspecified;
3981 }
3982 llvm_unreachable("Unknown nullability kind.");
3983 }
3984
3985 /// Retrieve the identifier "NSError".
getNSErrorIdent()3986 IdentifierInfo *Sema::getNSErrorIdent() {
3987 if (!Ident_NSError)
3988 Ident_NSError = PP.getIdentifierInfo("NSError");
3989
3990 return Ident_NSError;
3991 }
3992
3993 /// Check whether there is a nullability attribute of any kind in the given
3994 /// attribute list.
hasNullabilityAttr(const ParsedAttributesView & attrs)3995 static bool hasNullabilityAttr(const ParsedAttributesView &attrs) {
3996 for (const ParsedAttr &AL : attrs) {
3997 if (AL.getKind() == ParsedAttr::AT_TypeNonNull ||
3998 AL.getKind() == ParsedAttr::AT_TypeNullable ||
3999 AL.getKind() == ParsedAttr::AT_TypeNullableResult ||
4000 AL.getKind() == ParsedAttr::AT_TypeNullUnspecified)
4001 return true;
4002 }
4003
4004 return false;
4005 }
4006
4007 namespace {
4008 /// Describes the kind of a pointer a declarator describes.
4009 enum class PointerDeclaratorKind {
4010 // Not a pointer.
4011 NonPointer,
4012 // Single-level pointer.
4013 SingleLevelPointer,
4014 // Multi-level pointer (of any pointer kind).
4015 MultiLevelPointer,
4016 // CFFooRef*
4017 MaybePointerToCFRef,
4018 // CFErrorRef*
4019 CFErrorRefPointer,
4020 // NSError**
4021 NSErrorPointerPointer,
4022 };
4023
4024 /// Describes a declarator chunk wrapping a pointer that marks inference as
4025 /// unexpected.
4026 // These values must be kept in sync with diagnostics.
4027 enum class PointerWrappingDeclaratorKind {
4028 /// Pointer is top-level.
4029 None = -1,
4030 /// Pointer is an array element.
4031 Array = 0,
4032 /// Pointer is the referent type of a C++ reference.
4033 Reference = 1
4034 };
4035 } // end anonymous namespace
4036
4037 /// Classify the given declarator, whose type-specified is \c type, based on
4038 /// what kind of pointer it refers to.
4039 ///
4040 /// This is used to determine the default nullability.
4041 static PointerDeclaratorKind
classifyPointerDeclarator(Sema & S,QualType type,Declarator & declarator,PointerWrappingDeclaratorKind & wrappingKind)4042 classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
4043 PointerWrappingDeclaratorKind &wrappingKind) {
4044 unsigned numNormalPointers = 0;
4045
4046 // For any dependent type, we consider it a non-pointer.
4047 if (type->isDependentType())
4048 return PointerDeclaratorKind::NonPointer;
4049
4050 // Look through the declarator chunks to identify pointers.
4051 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
4052 DeclaratorChunk &chunk = declarator.getTypeObject(i);
4053 switch (chunk.Kind) {
4054 case DeclaratorChunk::Array:
4055 if (numNormalPointers == 0)
4056 wrappingKind = PointerWrappingDeclaratorKind::Array;
4057 break;
4058
4059 case DeclaratorChunk::Function:
4060 case DeclaratorChunk::Pipe:
4061 break;
4062
4063 case DeclaratorChunk::BlockPointer:
4064 case DeclaratorChunk::MemberPointer:
4065 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4066 : PointerDeclaratorKind::SingleLevelPointer;
4067
4068 case DeclaratorChunk::Paren:
4069 break;
4070
4071 case DeclaratorChunk::Reference:
4072 if (numNormalPointers == 0)
4073 wrappingKind = PointerWrappingDeclaratorKind::Reference;
4074 break;
4075
4076 case DeclaratorChunk::Pointer:
4077 ++numNormalPointers;
4078 if (numNormalPointers > 2)
4079 return PointerDeclaratorKind::MultiLevelPointer;
4080 break;
4081 }
4082 }
4083
4084 // Then, dig into the type specifier itself.
4085 unsigned numTypeSpecifierPointers = 0;
4086 do {
4087 // Decompose normal pointers.
4088 if (auto ptrType = type->getAs<PointerType>()) {
4089 ++numNormalPointers;
4090
4091 if (numNormalPointers > 2)
4092 return PointerDeclaratorKind::MultiLevelPointer;
4093
4094 type = ptrType->getPointeeType();
4095 ++numTypeSpecifierPointers;
4096 continue;
4097 }
4098
4099 // Decompose block pointers.
4100 if (type->getAs<BlockPointerType>()) {
4101 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4102 : PointerDeclaratorKind::SingleLevelPointer;
4103 }
4104
4105 // Decompose member pointers.
4106 if (type->getAs<MemberPointerType>()) {
4107 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4108 : PointerDeclaratorKind::SingleLevelPointer;
4109 }
4110
4111 // Look at Objective-C object pointers.
4112 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
4113 ++numNormalPointers;
4114 ++numTypeSpecifierPointers;
4115
4116 // If this is NSError**, report that.
4117 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
4118 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
4119 numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
4120 return PointerDeclaratorKind::NSErrorPointerPointer;
4121 }
4122 }
4123
4124 break;
4125 }
4126
4127 // Look at Objective-C class types.
4128 if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
4129 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
4130 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
4131 return PointerDeclaratorKind::NSErrorPointerPointer;
4132 }
4133
4134 break;
4135 }
4136
4137 // If at this point we haven't seen a pointer, we won't see one.
4138 if (numNormalPointers == 0)
4139 return PointerDeclaratorKind::NonPointer;
4140
4141 if (auto recordType = type->getAs<RecordType>()) {
4142 RecordDecl *recordDecl = recordType->getDecl();
4143
4144 // If this is CFErrorRef*, report it as such.
4145 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2 &&
4146 S.isCFError(recordDecl)) {
4147 return PointerDeclaratorKind::CFErrorRefPointer;
4148 }
4149 break;
4150 }
4151
4152 break;
4153 } while (true);
4154
4155 switch (numNormalPointers) {
4156 case 0:
4157 return PointerDeclaratorKind::NonPointer;
4158
4159 case 1:
4160 return PointerDeclaratorKind::SingleLevelPointer;
4161
4162 case 2:
4163 return PointerDeclaratorKind::MaybePointerToCFRef;
4164
4165 default:
4166 return PointerDeclaratorKind::MultiLevelPointer;
4167 }
4168 }
4169
isCFError(RecordDecl * RD)4170 bool Sema::isCFError(RecordDecl *RD) {
4171 // If we already know about CFError, test it directly.
4172 if (CFError)
4173 return CFError == RD;
4174
4175 // Check whether this is CFError, which we identify based on its bridge to
4176 // NSError. CFErrorRef used to be declared with "objc_bridge" but is now
4177 // declared with "objc_bridge_mutable", so look for either one of the two
4178 // attributes.
4179 if (RD->getTagKind() == TTK_Struct) {
4180 IdentifierInfo *bridgedType = nullptr;
4181 if (auto bridgeAttr = RD->getAttr<ObjCBridgeAttr>())
4182 bridgedType = bridgeAttr->getBridgedType();
4183 else if (auto bridgeAttr = RD->getAttr<ObjCBridgeMutableAttr>())
4184 bridgedType = bridgeAttr->getBridgedType();
4185
4186 if (bridgedType == getNSErrorIdent()) {
4187 CFError = RD;
4188 return true;
4189 }
4190 }
4191
4192 return false;
4193 }
4194
getNullabilityCompletenessCheckFileID(Sema & S,SourceLocation loc)4195 static FileID getNullabilityCompletenessCheckFileID(Sema &S,
4196 SourceLocation loc) {
4197 // If we're anywhere in a function, method, or closure context, don't perform
4198 // completeness checks.
4199 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
4200 if (ctx->isFunctionOrMethod())
4201 return FileID();
4202
4203 if (ctx->isFileContext())
4204 break;
4205 }
4206
4207 // We only care about the expansion location.
4208 loc = S.SourceMgr.getExpansionLoc(loc);
4209 FileID file = S.SourceMgr.getFileID(loc);
4210 if (file.isInvalid())
4211 return FileID();
4212
4213 // Retrieve file information.
4214 bool invalid = false;
4215 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
4216 if (invalid || !sloc.isFile())
4217 return FileID();
4218
4219 // We don't want to perform completeness checks on the main file or in
4220 // system headers.
4221 const SrcMgr::FileInfo &fileInfo = sloc.getFile();
4222 if (fileInfo.getIncludeLoc().isInvalid())
4223 return FileID();
4224 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
4225 S.Diags.getSuppressSystemWarnings()) {
4226 return FileID();
4227 }
4228
4229 return file;
4230 }
4231
4232 /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
4233 /// taking into account whitespace before and after.
4234 template <typename DiagBuilderT>
fixItNullability(Sema & S,DiagBuilderT & Diag,SourceLocation PointerLoc,NullabilityKind Nullability)4235 static void fixItNullability(Sema &S, DiagBuilderT &Diag,
4236 SourceLocation PointerLoc,
4237 NullabilityKind Nullability) {
4238 assert(PointerLoc.isValid());
4239 if (PointerLoc.isMacroID())
4240 return;
4241
4242 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
4243 if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
4244 return;
4245
4246 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
4247 if (!NextChar)
4248 return;
4249
4250 SmallString<32> InsertionTextBuf{" "};
4251 InsertionTextBuf += getNullabilitySpelling(Nullability);
4252 InsertionTextBuf += " ";
4253 StringRef InsertionText = InsertionTextBuf.str();
4254
4255 if (isWhitespace(*NextChar)) {
4256 InsertionText = InsertionText.drop_back();
4257 } else if (NextChar[-1] == '[') {
4258 if (NextChar[0] == ']')
4259 InsertionText = InsertionText.drop_back().drop_front();
4260 else
4261 InsertionText = InsertionText.drop_front();
4262 } else if (!isAsciiIdentifierContinue(NextChar[0], /*allow dollar*/ true) &&
4263 !isAsciiIdentifierContinue(NextChar[-1], /*allow dollar*/ true)) {
4264 InsertionText = InsertionText.drop_back().drop_front();
4265 }
4266
4267 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
4268 }
4269
emitNullabilityConsistencyWarning(Sema & S,SimplePointerKind PointerKind,SourceLocation PointerLoc,SourceLocation PointerEndLoc)4270 static void emitNullabilityConsistencyWarning(Sema &S,
4271 SimplePointerKind PointerKind,
4272 SourceLocation PointerLoc,
4273 SourceLocation PointerEndLoc) {
4274 assert(PointerLoc.isValid());
4275
4276 if (PointerKind == SimplePointerKind::Array) {
4277 S.Diag(PointerLoc, diag::warn_nullability_missing_array);
4278 } else {
4279 S.Diag(PointerLoc, diag::warn_nullability_missing)
4280 << static_cast<unsigned>(PointerKind);
4281 }
4282
4283 auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc;
4284 if (FixItLoc.isMacroID())
4285 return;
4286
4287 auto addFixIt = [&](NullabilityKind Nullability) {
4288 auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it);
4289 Diag << static_cast<unsigned>(Nullability);
4290 Diag << static_cast<unsigned>(PointerKind);
4291 fixItNullability(S, Diag, FixItLoc, Nullability);
4292 };
4293 addFixIt(NullabilityKind::Nullable);
4294 addFixIt(NullabilityKind::NonNull);
4295 }
4296
4297 /// Complains about missing nullability if the file containing \p pointerLoc
4298 /// has other uses of nullability (either the keywords or the \c assume_nonnull
4299 /// pragma).
4300 ///
4301 /// If the file has \e not seen other uses of nullability, this particular
4302 /// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
4303 static void
checkNullabilityConsistency(Sema & S,SimplePointerKind pointerKind,SourceLocation pointerLoc,SourceLocation pointerEndLoc=SourceLocation ())4304 checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind,
4305 SourceLocation pointerLoc,
4306 SourceLocation pointerEndLoc = SourceLocation()) {
4307 // Determine which file we're performing consistency checking for.
4308 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
4309 if (file.isInvalid())
4310 return;
4311
4312 // If we haven't seen any type nullability in this file, we won't warn now
4313 // about anything.
4314 FileNullability &fileNullability = S.NullabilityMap[file];
4315 if (!fileNullability.SawTypeNullability) {
4316 // If this is the first pointer declarator in the file, and the appropriate
4317 // warning is on, record it in case we need to diagnose it retroactively.
4318 diag::kind diagKind;
4319 if (pointerKind == SimplePointerKind::Array)
4320 diagKind = diag::warn_nullability_missing_array;
4321 else
4322 diagKind = diag::warn_nullability_missing;
4323
4324 if (fileNullability.PointerLoc.isInvalid() &&
4325 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
4326 fileNullability.PointerLoc = pointerLoc;
4327 fileNullability.PointerEndLoc = pointerEndLoc;
4328 fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
4329 }
4330
4331 return;
4332 }
4333
4334 // Complain about missing nullability.
4335 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc);
4336 }
4337
4338 /// Marks that a nullability feature has been used in the file containing
4339 /// \p loc.
4340 ///
4341 /// If this file already had pointer types in it that were missing nullability,
4342 /// the first such instance is retroactively diagnosed.
4343 ///
4344 /// \sa checkNullabilityConsistency
recordNullabilitySeen(Sema & S,SourceLocation loc)4345 static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
4346 FileID file = getNullabilityCompletenessCheckFileID(S, loc);
4347 if (file.isInvalid())
4348 return;
4349
4350 FileNullability &fileNullability = S.NullabilityMap[file];
4351 if (fileNullability.SawTypeNullability)
4352 return;
4353 fileNullability.SawTypeNullability = true;
4354
4355 // If we haven't seen any type nullability before, now we have. Retroactively
4356 // diagnose the first unannotated pointer, if there was one.
4357 if (fileNullability.PointerLoc.isInvalid())
4358 return;
4359
4360 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
4361 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc,
4362 fileNullability.PointerEndLoc);
4363 }
4364
4365 /// Returns true if any of the declarator chunks before \p endIndex include a
4366 /// level of indirection: array, pointer, reference, or pointer-to-member.
4367 ///
4368 /// Because declarator chunks are stored in outer-to-inner order, testing
4369 /// every chunk before \p endIndex is testing all chunks that embed the current
4370 /// chunk as part of their type.
4371 ///
4372 /// It is legal to pass the result of Declarator::getNumTypeObjects() as the
4373 /// end index, in which case all chunks are tested.
hasOuterPointerLikeChunk(const Declarator & D,unsigned endIndex)4374 static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
4375 unsigned i = endIndex;
4376 while (i != 0) {
4377 // Walk outwards along the declarator chunks.
4378 --i;
4379 const DeclaratorChunk &DC = D.getTypeObject(i);
4380 switch (DC.Kind) {
4381 case DeclaratorChunk::Paren:
4382 break;
4383 case DeclaratorChunk::Array:
4384 case DeclaratorChunk::Pointer:
4385 case DeclaratorChunk::Reference:
4386 case DeclaratorChunk::MemberPointer:
4387 return true;
4388 case DeclaratorChunk::Function:
4389 case DeclaratorChunk::BlockPointer:
4390 case DeclaratorChunk::Pipe:
4391 // These are invalid anyway, so just ignore.
4392 break;
4393 }
4394 }
4395 return false;
4396 }
4397
IsNoDerefableChunk(DeclaratorChunk Chunk)4398 static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
4399 return (Chunk.Kind == DeclaratorChunk::Pointer ||
4400 Chunk.Kind == DeclaratorChunk::Array);
4401 }
4402
4403 template<typename AttrT>
createSimpleAttr(ASTContext & Ctx,ParsedAttr & AL)4404 static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
4405 AL.setUsedAsTypeAttr();
4406 return ::new (Ctx) AttrT(Ctx, AL);
4407 }
4408
createNullabilityAttr(ASTContext & Ctx,ParsedAttr & Attr,NullabilityKind NK)4409 static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
4410 NullabilityKind NK) {
4411 switch (NK) {
4412 case NullabilityKind::NonNull:
4413 return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);
4414
4415 case NullabilityKind::Nullable:
4416 return createSimpleAttr<TypeNullableAttr>(Ctx, Attr);
4417
4418 case NullabilityKind::NullableResult:
4419 return createSimpleAttr<TypeNullableResultAttr>(Ctx, Attr);
4420
4421 case NullabilityKind::Unspecified:
4422 return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr);
4423 }
4424 llvm_unreachable("unknown NullabilityKind");
4425 }
4426
4427 // Diagnose whether this is a case with the multiple addr spaces.
4428 // Returns true if this is an invalid case.
4429 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4430 // by qualifiers for two or more different address spaces."
DiagnoseMultipleAddrSpaceAttributes(Sema & S,LangAS ASOld,LangAS ASNew,SourceLocation AttrLoc)4431 static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld,
4432 LangAS ASNew,
4433 SourceLocation AttrLoc) {
4434 if (ASOld != LangAS::Default) {
4435 if (ASOld != ASNew) {
4436 S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
4437 return true;
4438 }
4439 // Emit a warning if they are identical; it's likely unintended.
4440 S.Diag(AttrLoc,
4441 diag::warn_attribute_address_multiple_identical_qualifiers);
4442 }
4443 return false;
4444 }
4445
GetFullTypeForDeclarator(TypeProcessingState & state,QualType declSpecType,TypeSourceInfo * TInfo)4446 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
4447 QualType declSpecType,
4448 TypeSourceInfo *TInfo) {
4449 // The TypeSourceInfo that this function returns will not be a null type.
4450 // If there is an error, this function will fill in a dummy type as fallback.
4451 QualType T = declSpecType;
4452 Declarator &D = state.getDeclarator();
4453 Sema &S = state.getSema();
4454 ASTContext &Context = S.Context;
4455 const LangOptions &LangOpts = S.getLangOpts();
4456
4457 // The name we're declaring, if any.
4458 DeclarationName Name;
4459 if (D.getIdentifier())
4460 Name = D.getIdentifier();
4461
4462 // Does this declaration declare a typedef-name?
4463 bool IsTypedefName =
4464 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
4465 D.getContext() == DeclaratorContext::AliasDecl ||
4466 D.getContext() == DeclaratorContext::AliasTemplate;
4467
4468 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
4469 bool IsQualifiedFunction = T->isFunctionProtoType() &&
4470 (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() ||
4471 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
4472
4473 // If T is 'decltype(auto)', the only declarators we can have are parens
4474 // and at most one function declarator if this is a function declaration.
4475 // If T is a deduced class template specialization type, we can have no
4476 // declarator chunks at all.
4477 if (auto *DT = T->getAs<DeducedType>()) {
4478 const AutoType *AT = T->getAs<AutoType>();
4479 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
4480 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
4481 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4482 unsigned Index = E - I - 1;
4483 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
4484 unsigned DiagId = IsClassTemplateDeduction
4485 ? diag::err_deduced_class_template_compound_type
4486 : diag::err_decltype_auto_compound_type;
4487 unsigned DiagKind = 0;
4488 switch (DeclChunk.Kind) {
4489 case DeclaratorChunk::Paren:
4490 // FIXME: Rejecting this is a little silly.
4491 if (IsClassTemplateDeduction) {
4492 DiagKind = 4;
4493 break;
4494 }
4495 continue;
4496 case DeclaratorChunk::Function: {
4497 if (IsClassTemplateDeduction) {
4498 DiagKind = 3;
4499 break;
4500 }
4501 unsigned FnIndex;
4502 if (D.isFunctionDeclarationContext() &&
4503 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
4504 continue;
4505 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
4506 break;
4507 }
4508 case DeclaratorChunk::Pointer:
4509 case DeclaratorChunk::BlockPointer:
4510 case DeclaratorChunk::MemberPointer:
4511 DiagKind = 0;
4512 break;
4513 case DeclaratorChunk::Reference:
4514 DiagKind = 1;
4515 break;
4516 case DeclaratorChunk::Array:
4517 DiagKind = 2;
4518 break;
4519 case DeclaratorChunk::Pipe:
4520 break;
4521 }
4522
4523 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
4524 D.setInvalidType(true);
4525 break;
4526 }
4527 }
4528 }
4529
4530 // Determine whether we should infer _Nonnull on pointer types.
4531 Optional<NullabilityKind> inferNullability;
4532 bool inferNullabilityCS = false;
4533 bool inferNullabilityInnerOnly = false;
4534 bool inferNullabilityInnerOnlyComplete = false;
4535
4536 // Are we in an assume-nonnull region?
4537 bool inAssumeNonNullRegion = false;
4538 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
4539 if (assumeNonNullLoc.isValid()) {
4540 inAssumeNonNullRegion = true;
4541 recordNullabilitySeen(S, assumeNonNullLoc);
4542 }
4543
4544 // Whether to complain about missing nullability specifiers or not.
4545 enum {
4546 /// Never complain.
4547 CAMN_No,
4548 /// Complain on the inner pointers (but not the outermost
4549 /// pointer).
4550 CAMN_InnerPointers,
4551 /// Complain about any pointers that don't have nullability
4552 /// specified or inferred.
4553 CAMN_Yes
4554 } complainAboutMissingNullability = CAMN_No;
4555 unsigned NumPointersRemaining = 0;
4556 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;
4557
4558 if (IsTypedefName) {
4559 // For typedefs, we do not infer any nullability (the default),
4560 // and we only complain about missing nullability specifiers on
4561 // inner pointers.
4562 complainAboutMissingNullability = CAMN_InnerPointers;
4563
4564 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4565 !T->getNullability(S.Context)) {
4566 // Note that we allow but don't require nullability on dependent types.
4567 ++NumPointersRemaining;
4568 }
4569
4570 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
4571 DeclaratorChunk &chunk = D.getTypeObject(i);
4572 switch (chunk.Kind) {
4573 case DeclaratorChunk::Array:
4574 case DeclaratorChunk::Function:
4575 case DeclaratorChunk::Pipe:
4576 break;
4577
4578 case DeclaratorChunk::BlockPointer:
4579 case DeclaratorChunk::MemberPointer:
4580 ++NumPointersRemaining;
4581 break;
4582
4583 case DeclaratorChunk::Paren:
4584 case DeclaratorChunk::Reference:
4585 continue;
4586
4587 case DeclaratorChunk::Pointer:
4588 ++NumPointersRemaining;
4589 continue;
4590 }
4591 }
4592 } else {
4593 bool isFunctionOrMethod = false;
4594 switch (auto context = state.getDeclarator().getContext()) {
4595 case DeclaratorContext::ObjCParameter:
4596 case DeclaratorContext::ObjCResult:
4597 case DeclaratorContext::Prototype:
4598 case DeclaratorContext::TrailingReturn:
4599 case DeclaratorContext::TrailingReturnVar:
4600 isFunctionOrMethod = true;
4601 LLVM_FALLTHROUGH;
4602
4603 case DeclaratorContext::Member:
4604 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
4605 complainAboutMissingNullability = CAMN_No;
4606 break;
4607 }
4608
4609 // Weak properties are inferred to be nullable.
4610 if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) {
4611 inferNullability = NullabilityKind::Nullable;
4612 break;
4613 }
4614
4615 LLVM_FALLTHROUGH;
4616
4617 case DeclaratorContext::File:
4618 case DeclaratorContext::KNRTypeList: {
4619 complainAboutMissingNullability = CAMN_Yes;
4620
4621 // Nullability inference depends on the type and declarator.
4622 auto wrappingKind = PointerWrappingDeclaratorKind::None;
4623 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
4624 case PointerDeclaratorKind::NonPointer:
4625 case PointerDeclaratorKind::MultiLevelPointer:
4626 // Cannot infer nullability.
4627 break;
4628
4629 case PointerDeclaratorKind::SingleLevelPointer:
4630 // Infer _Nonnull if we are in an assumes-nonnull region.
4631 if (inAssumeNonNullRegion) {
4632 complainAboutInferringWithinChunk = wrappingKind;
4633 inferNullability = NullabilityKind::NonNull;
4634 inferNullabilityCS = (context == DeclaratorContext::ObjCParameter ||
4635 context == DeclaratorContext::ObjCResult);
4636 }
4637 break;
4638
4639 case PointerDeclaratorKind::CFErrorRefPointer:
4640 case PointerDeclaratorKind::NSErrorPointerPointer:
4641 // Within a function or method signature, infer _Nullable at both
4642 // levels.
4643 if (isFunctionOrMethod && inAssumeNonNullRegion)
4644 inferNullability = NullabilityKind::Nullable;
4645 break;
4646
4647 case PointerDeclaratorKind::MaybePointerToCFRef:
4648 if (isFunctionOrMethod) {
4649 // On pointer-to-pointer parameters marked cf_returns_retained or
4650 // cf_returns_not_retained, if the outer pointer is explicit then
4651 // infer the inner pointer as _Nullable.
4652 auto hasCFReturnsAttr =
4653 [](const ParsedAttributesView &AttrList) -> bool {
4654 return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) ||
4655 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained);
4656 };
4657 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
4658 if (hasCFReturnsAttr(D.getAttributes()) ||
4659 hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
4660 hasCFReturnsAttr(D.getDeclSpec().getAttributes())) {
4661 inferNullability = NullabilityKind::Nullable;
4662 inferNullabilityInnerOnly = true;
4663 }
4664 }
4665 }
4666 break;
4667 }
4668 break;
4669 }
4670
4671 case DeclaratorContext::ConversionId:
4672 complainAboutMissingNullability = CAMN_Yes;
4673 break;
4674
4675 case DeclaratorContext::AliasDecl:
4676 case DeclaratorContext::AliasTemplate:
4677 case DeclaratorContext::Block:
4678 case DeclaratorContext::BlockLiteral:
4679 case DeclaratorContext::Condition:
4680 case DeclaratorContext::CXXCatch:
4681 case DeclaratorContext::CXXNew:
4682 case DeclaratorContext::ForInit:
4683 case DeclaratorContext::SelectionInit:
4684 case DeclaratorContext::LambdaExpr:
4685 case DeclaratorContext::LambdaExprParameter:
4686 case DeclaratorContext::ObjCCatch:
4687 case DeclaratorContext::TemplateParam:
4688 case DeclaratorContext::TemplateArg:
4689 case DeclaratorContext::TemplateTypeArg:
4690 case DeclaratorContext::TypeName:
4691 case DeclaratorContext::FunctionalCast:
4692 case DeclaratorContext::RequiresExpr:
4693 // Don't infer in these contexts.
4694 break;
4695 }
4696 }
4697
4698 // Local function that returns true if its argument looks like a va_list.
4699 auto isVaList = [&S](QualType T) -> bool {
4700 auto *typedefTy = T->getAs<TypedefType>();
4701 if (!typedefTy)
4702 return false;
4703 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
4704 do {
4705 if (typedefTy->getDecl() == vaListTypedef)
4706 return true;
4707 if (auto *name = typedefTy->getDecl()->getIdentifier())
4708 if (name->isStr("va_list"))
4709 return true;
4710 typedefTy = typedefTy->desugar()->getAs<TypedefType>();
4711 } while (typedefTy);
4712 return false;
4713 };
4714
4715 // Local function that checks the nullability for a given pointer declarator.
4716 // Returns true if _Nonnull was inferred.
4717 auto inferPointerNullability =
4718 [&](SimplePointerKind pointerKind, SourceLocation pointerLoc,
4719 SourceLocation pointerEndLoc,
4720 ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * {
4721 // We've seen a pointer.
4722 if (NumPointersRemaining > 0)
4723 --NumPointersRemaining;
4724
4725 // If a nullability attribute is present, there's nothing to do.
4726 if (hasNullabilityAttr(attrs))
4727 return nullptr;
4728
4729 // If we're supposed to infer nullability, do so now.
4730 if (inferNullability && !inferNullabilityInnerOnlyComplete) {
4731 ParsedAttr::Syntax syntax = inferNullabilityCS
4732 ? ParsedAttr::AS_ContextSensitiveKeyword
4733 : ParsedAttr::AS_Keyword;
4734 ParsedAttr *nullabilityAttr = Pool.create(
4735 S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
4736 nullptr, SourceLocation(), nullptr, 0, syntax);
4737
4738 attrs.addAtEnd(nullabilityAttr);
4739
4740 if (inferNullabilityCS) {
4741 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
4742 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
4743 }
4744
4745 if (pointerLoc.isValid() &&
4746 complainAboutInferringWithinChunk !=
4747 PointerWrappingDeclaratorKind::None) {
4748 auto Diag =
4749 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
4750 Diag << static_cast<int>(complainAboutInferringWithinChunk);
4751 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
4752 }
4753
4754 if (inferNullabilityInnerOnly)
4755 inferNullabilityInnerOnlyComplete = true;
4756 return nullabilityAttr;
4757 }
4758
4759 // If we're supposed to complain about missing nullability, do so
4760 // now if it's truly missing.
4761 switch (complainAboutMissingNullability) {
4762 case CAMN_No:
4763 break;
4764
4765 case CAMN_InnerPointers:
4766 if (NumPointersRemaining == 0)
4767 break;
4768 LLVM_FALLTHROUGH;
4769
4770 case CAMN_Yes:
4771 checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc);
4772 }
4773 return nullptr;
4774 };
4775
4776 // If the type itself could have nullability but does not, infer pointer
4777 // nullability and perform consistency checking.
4778 if (S.CodeSynthesisContexts.empty()) {
4779 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4780 !T->getNullability(S.Context)) {
4781 if (isVaList(T)) {
4782 // Record that we've seen a pointer, but do nothing else.
4783 if (NumPointersRemaining > 0)
4784 --NumPointersRemaining;
4785 } else {
4786 SimplePointerKind pointerKind = SimplePointerKind::Pointer;
4787 if (T->isBlockPointerType())
4788 pointerKind = SimplePointerKind::BlockPointer;
4789 else if (T->isMemberPointerType())
4790 pointerKind = SimplePointerKind::MemberPointer;
4791
4792 if (auto *attr = inferPointerNullability(
4793 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
4794 D.getDeclSpec().getEndLoc(),
4795 D.getMutableDeclSpec().getAttributes(),
4796 D.getMutableDeclSpec().getAttributePool())) {
4797 T = state.getAttributedType(
4798 createNullabilityAttr(Context, *attr, *inferNullability), T, T);
4799 }
4800 }
4801 }
4802
4803 if (complainAboutMissingNullability == CAMN_Yes &&
4804 T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) &&
4805 D.isPrototypeContext() &&
4806 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
4807 checkNullabilityConsistency(S, SimplePointerKind::Array,
4808 D.getDeclSpec().getTypeSpecTypeLoc());
4809 }
4810 }
4811
4812 bool ExpectNoDerefChunk =
4813 state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref);
4814
4815 // Walk the DeclTypeInfo, building the recursive type as we go.
4816 // DeclTypeInfos are ordered from the identifier out, which is
4817 // opposite of what we want :).
4818 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
4819 unsigned chunkIndex = e - i - 1;
4820 state.setCurrentChunkIndex(chunkIndex);
4821 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
4822 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
4823 switch (DeclType.Kind) {
4824 case DeclaratorChunk::Paren:
4825 if (i == 0)
4826 warnAboutRedundantParens(S, D, T);
4827 T = S.BuildParenType(T);
4828 break;
4829 case DeclaratorChunk::BlockPointer:
4830 // If blocks are disabled, emit an error.
4831 if (!LangOpts.Blocks)
4832 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;
4833
4834 // Handle pointer nullability.
4835 inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc,
4836 DeclType.EndLoc, DeclType.getAttrs(),
4837 state.getDeclarator().getAttributePool());
4838
4839 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
4840 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
4841 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
4842 // qualified with const.
4843 if (LangOpts.OpenCL)
4844 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
4845 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
4846 }
4847 break;
4848 case DeclaratorChunk::Pointer:
4849 // Verify that we're not building a pointer to pointer to function with
4850 // exception specification.
4851 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4852 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4853 D.setInvalidType(true);
4854 // Build the type anyway.
4855 }
4856
4857 // Handle pointer nullability
4858 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
4859 DeclType.EndLoc, DeclType.getAttrs(),
4860 state.getDeclarator().getAttributePool());
4861
4862 if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) {
4863 T = Context.getObjCObjectPointerType(T);
4864 if (DeclType.Ptr.TypeQuals)
4865 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4866 break;
4867 }
4868
4869 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
4870 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
4871 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
4872 if (LangOpts.OpenCL) {
4873 if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
4874 T->isBlockPointerType()) {
4875 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
4876 D.setInvalidType(true);
4877 }
4878 }
4879
4880 T = S.BuildPointerType(T, DeclType.Loc, Name);
4881 if (DeclType.Ptr.TypeQuals)
4882 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4883 break;
4884 case DeclaratorChunk::Reference: {
4885 // Verify that we're not building a reference to pointer to function with
4886 // exception specification.
4887 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4888 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4889 D.setInvalidType(true);
4890 // Build the type anyway.
4891 }
4892 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
4893
4894 if (DeclType.Ref.HasRestrict)
4895 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
4896 break;
4897 }
4898 case DeclaratorChunk::Array: {
4899 // Verify that we're not building an array of pointers to function with
4900 // exception specification.
4901 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4902 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4903 D.setInvalidType(true);
4904 // Build the type anyway.
4905 }
4906 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
4907 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
4908 ArrayType::ArraySizeModifier ASM;
4909 if (ATI.isStar)
4910 ASM = ArrayType::Star;
4911 else if (ATI.hasStatic)
4912 ASM = ArrayType::Static;
4913 else
4914 ASM = ArrayType::Normal;
4915 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
4916 // FIXME: This check isn't quite right: it allows star in prototypes
4917 // for function definitions, and disallows some edge cases detailed
4918 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
4919 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
4920 ASM = ArrayType::Normal;
4921 D.setInvalidType(true);
4922 }
4923
4924 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
4925 // shall appear only in a declaration of a function parameter with an
4926 // array type, ...
4927 if (ASM == ArrayType::Static || ATI.TypeQuals) {
4928 if (!(D.isPrototypeContext() ||
4929 D.getContext() == DeclaratorContext::KNRTypeList)) {
4930 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
4931 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4932 // Remove the 'static' and the type qualifiers.
4933 if (ASM == ArrayType::Static)
4934 ASM = ArrayType::Normal;
4935 ATI.TypeQuals = 0;
4936 D.setInvalidType(true);
4937 }
4938
4939 // C99 6.7.5.2p1: ... and then only in the outermost array type
4940 // derivation.
4941 if (hasOuterPointerLikeChunk(D, chunkIndex)) {
4942 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
4943 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4944 if (ASM == ArrayType::Static)
4945 ASM = ArrayType::Normal;
4946 ATI.TypeQuals = 0;
4947 D.setInvalidType(true);
4948 }
4949 }
4950 const AutoType *AT = T->getContainedAutoType();
4951 // Allow arrays of auto if we are a generic lambda parameter.
4952 // i.e. [](auto (&array)[5]) { return array[0]; }; OK
4953 if (AT && D.getContext() != DeclaratorContext::LambdaExprParameter) {
4954 // We've already diagnosed this for decltype(auto).
4955 if (!AT->isDecltypeAuto())
4956 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
4957 << getPrintableNameForEntity(Name) << T;
4958 T = QualType();
4959 break;
4960 }
4961
4962 // Array parameters can be marked nullable as well, although it's not
4963 // necessary if they're marked 'static'.
4964 if (complainAboutMissingNullability == CAMN_Yes &&
4965 !hasNullabilityAttr(DeclType.getAttrs()) &&
4966 ASM != ArrayType::Static &&
4967 D.isPrototypeContext() &&
4968 !hasOuterPointerLikeChunk(D, chunkIndex)) {
4969 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
4970 }
4971
4972 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
4973 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
4974 break;
4975 }
4976 case DeclaratorChunk::Function: {
4977 // If the function declarator has a prototype (i.e. it is not () and
4978 // does not have a K&R-style identifier list), then the arguments are part
4979 // of the type, otherwise the argument list is ().
4980 DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
4981 IsQualifiedFunction =
4982 FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier();
4983
4984 // Check for auto functions and trailing return type and adjust the
4985 // return type accordingly.
4986 if (!D.isInvalidType()) {
4987 // trailing-return-type is only required if we're declaring a function,
4988 // and not, for instance, a pointer to a function.
4989 if (D.getDeclSpec().hasAutoTypeSpec() &&
4990 !FTI.hasTrailingReturnType() && chunkIndex == 0) {
4991 if (!S.getLangOpts().CPlusPlus14) {
4992 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4993 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
4994 ? diag::err_auto_missing_trailing_return
4995 : diag::err_deduced_return_type);
4996 T = Context.IntTy;
4997 D.setInvalidType(true);
4998 } else {
4999 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5000 diag::warn_cxx11_compat_deduced_return_type);
5001 }
5002 } else if (FTI.hasTrailingReturnType()) {
5003 // T must be exactly 'auto' at this point. See CWG issue 681.
5004 if (isa<ParenType>(T)) {
5005 S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens)
5006 << T << D.getSourceRange();
5007 D.setInvalidType(true);
5008 } else if (D.getName().getKind() ==
5009 UnqualifiedIdKind::IK_DeductionGuideName) {
5010 if (T != Context.DependentTy) {
5011 S.Diag(D.getDeclSpec().getBeginLoc(),
5012 diag::err_deduction_guide_with_complex_decl)
5013 << D.getSourceRange();
5014 D.setInvalidType(true);
5015 }
5016 } else if (D.getContext() != DeclaratorContext::LambdaExpr &&
5017 (T.hasQualifiers() || !isa<AutoType>(T) ||
5018 cast<AutoType>(T)->getKeyword() !=
5019 AutoTypeKeyword::Auto ||
5020 cast<AutoType>(T)->isConstrained())) {
5021 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5022 diag::err_trailing_return_without_auto)
5023 << T << D.getDeclSpec().getSourceRange();
5024 D.setInvalidType(true);
5025 }
5026 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
5027 if (T.isNull()) {
5028 // An error occurred parsing the trailing return type.
5029 T = Context.IntTy;
5030 D.setInvalidType(true);
5031 } else if (AutoType *Auto = T->getContainedAutoType()) {
5032 // If the trailing return type contains an `auto`, we may need to
5033 // invent a template parameter for it, for cases like
5034 // `auto f() -> C auto` or `[](auto (*p) -> auto) {}`.
5035 InventedTemplateParameterInfo *InventedParamInfo = nullptr;
5036 if (D.getContext() == DeclaratorContext::Prototype)
5037 InventedParamInfo = &S.InventedParameterInfos.back();
5038 else if (D.getContext() == DeclaratorContext::LambdaExprParameter)
5039 InventedParamInfo = S.getCurLambda();
5040 if (InventedParamInfo) {
5041 std::tie(T, TInfo) = InventTemplateParameter(
5042 state, T, TInfo, Auto, *InventedParamInfo);
5043 }
5044 }
5045 } else {
5046 // This function type is not the type of the entity being declared,
5047 // so checking the 'auto' is not the responsibility of this chunk.
5048 }
5049 }
5050
5051 // C99 6.7.5.3p1: The return type may not be a function or array type.
5052 // For conversion functions, we'll diagnose this particular error later.
5053 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
5054 (D.getName().getKind() !=
5055 UnqualifiedIdKind::IK_ConversionFunctionId)) {
5056 unsigned diagID = diag::err_func_returning_array_function;
5057 // Last processing chunk in block context means this function chunk
5058 // represents the block.
5059 if (chunkIndex == 0 &&
5060 D.getContext() == DeclaratorContext::BlockLiteral)
5061 diagID = diag::err_block_returning_array_function;
5062 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
5063 T = Context.IntTy;
5064 D.setInvalidType(true);
5065 }
5066
5067 // Do not allow returning half FP value.
5068 // FIXME: This really should be in BuildFunctionType.
5069 if (T->isHalfType()) {
5070 if (S.getLangOpts().OpenCL) {
5071 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5072 S.getLangOpts())) {
5073 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5074 << T << 0 /*pointer hint*/;
5075 D.setInvalidType(true);
5076 }
5077 } else if (!S.getLangOpts().HalfArgsAndReturns) {
5078 S.Diag(D.getIdentifierLoc(),
5079 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
5080 D.setInvalidType(true);
5081 }
5082 }
5083
5084 if (LangOpts.OpenCL) {
5085 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
5086 // function.
5087 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
5088 T->isPipeType()) {
5089 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5090 << T << 1 /*hint off*/;
5091 D.setInvalidType(true);
5092 }
5093 // OpenCL doesn't support variadic functions and blocks
5094 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
5095 // We also allow here any toolchain reserved identifiers.
5096 if (FTI.isVariadic &&
5097 !S.getOpenCLOptions().isAvailableOption(
5098 "__cl_clang_variadic_functions", S.getLangOpts()) &&
5099 !(D.getIdentifier() &&
5100 ((D.getIdentifier()->getName() == "printf" &&
5101 LangOpts.getOpenCLCompatibleVersion() >= 120) ||
5102 D.getIdentifier()->getName().startswith("__")))) {
5103 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
5104 D.setInvalidType(true);
5105 }
5106 }
5107
5108 // Methods cannot return interface types. All ObjC objects are
5109 // passed by reference.
5110 if (T->isObjCObjectType()) {
5111 SourceLocation DiagLoc, FixitLoc;
5112 if (TInfo) {
5113 DiagLoc = TInfo->getTypeLoc().getBeginLoc();
5114 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc());
5115 } else {
5116 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
5117 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc());
5118 }
5119 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
5120 << 0 << T
5121 << FixItHint::CreateInsertion(FixitLoc, "*");
5122
5123 T = Context.getObjCObjectPointerType(T);
5124 if (TInfo) {
5125 TypeLocBuilder TLB;
5126 TLB.pushFullCopy(TInfo->getTypeLoc());
5127 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
5128 TLoc.setStarLoc(FixitLoc);
5129 TInfo = TLB.getTypeSourceInfo(Context, T);
5130 }
5131
5132 D.setInvalidType(true);
5133 }
5134
5135 // cv-qualifiers on return types are pointless except when the type is a
5136 // class type in C++.
5137 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
5138 !(S.getLangOpts().CPlusPlus &&
5139 (T->isDependentType() || T->isRecordType()))) {
5140 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
5141 D.getFunctionDefinitionKind() ==
5142 FunctionDefinitionKind::Definition) {
5143 // [6.9.1/3] qualified void return is invalid on a C
5144 // function definition. Apparently ok on declarations and
5145 // in C++ though (!)
5146 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
5147 } else
5148 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
5149
5150 // C++2a [dcl.fct]p12:
5151 // A volatile-qualified return type is deprecated
5152 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20)
5153 S.Diag(DeclType.Loc, diag::warn_deprecated_volatile_return) << T;
5154 }
5155
5156 // Objective-C ARC ownership qualifiers are ignored on the function
5157 // return type (by type canonicalization). Complain if this attribute
5158 // was written here.
5159 if (T.getQualifiers().hasObjCLifetime()) {
5160 SourceLocation AttrLoc;
5161 if (chunkIndex + 1 < D.getNumTypeObjects()) {
5162 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
5163 for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) {
5164 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5165 AttrLoc = AL.getLoc();
5166 break;
5167 }
5168 }
5169 }
5170 if (AttrLoc.isInvalid()) {
5171 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
5172 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5173 AttrLoc = AL.getLoc();
5174 break;
5175 }
5176 }
5177 }
5178
5179 if (AttrLoc.isValid()) {
5180 // The ownership attributes are almost always written via
5181 // the predefined
5182 // __strong/__weak/__autoreleasing/__unsafe_unretained.
5183 if (AttrLoc.isMacroID())
5184 AttrLoc =
5185 S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin();
5186
5187 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
5188 << T.getQualifiers().getObjCLifetime();
5189 }
5190 }
5191
5192 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
5193 // C++ [dcl.fct]p6:
5194 // Types shall not be defined in return or parameter types.
5195 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
5196 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
5197 << Context.getTypeDeclType(Tag);
5198 }
5199
5200 // Exception specs are not allowed in typedefs. Complain, but add it
5201 // anyway.
5202 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17)
5203 S.Diag(FTI.getExceptionSpecLocBeg(),
5204 diag::err_exception_spec_in_typedef)
5205 << (D.getContext() == DeclaratorContext::AliasDecl ||
5206 D.getContext() == DeclaratorContext::AliasTemplate);
5207
5208 // If we see "T var();" or "T var(T());" at block scope, it is probably
5209 // an attempt to initialize a variable, not a function declaration.
5210 if (FTI.isAmbiguous)
5211 warnAboutAmbiguousFunction(S, D, DeclType, T);
5212
5213 FunctionType::ExtInfo EI(
5214 getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex));
5215
5216 if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus
5217 && !LangOpts.OpenCL) {
5218 // Simple void foo(), where the incoming T is the result type.
5219 T = Context.getFunctionNoProtoType(T, EI);
5220 } else {
5221 // We allow a zero-parameter variadic function in C if the
5222 // function is marked with the "overloadable" attribute. Scan
5223 // for this attribute now.
5224 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus)
5225 if (!D.getAttributes().hasAttribute(ParsedAttr::AT_Overloadable))
5226 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
5227
5228 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
5229 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
5230 // definition.
5231 S.Diag(FTI.Params[0].IdentLoc,
5232 diag::err_ident_list_in_fn_declaration);
5233 D.setInvalidType(true);
5234 // Recover by creating a K&R-style function type.
5235 T = Context.getFunctionNoProtoType(T, EI);
5236 break;
5237 }
5238
5239 FunctionProtoType::ExtProtoInfo EPI;
5240 EPI.ExtInfo = EI;
5241 EPI.Variadic = FTI.isVariadic;
5242 EPI.EllipsisLoc = FTI.getEllipsisLoc();
5243 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
5244 EPI.TypeQuals.addCVRUQualifiers(
5245 FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers()
5246 : 0);
5247 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
5248 : FTI.RefQualifierIsLValueRef? RQ_LValue
5249 : RQ_RValue;
5250
5251 // Otherwise, we have a function with a parameter list that is
5252 // potentially variadic.
5253 SmallVector<QualType, 16> ParamTys;
5254 ParamTys.reserve(FTI.NumParams);
5255
5256 SmallVector<FunctionProtoType::ExtParameterInfo, 16>
5257 ExtParameterInfos(FTI.NumParams);
5258 bool HasAnyInterestingExtParameterInfos = false;
5259
5260 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
5261 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
5262 QualType ParamTy = Param->getType();
5263 assert(!ParamTy.isNull() && "Couldn't parse type?");
5264
5265 // Look for 'void'. void is allowed only as a single parameter to a
5266 // function with no other parameters (C99 6.7.5.3p10). We record
5267 // int(void) as a FunctionProtoType with an empty parameter list.
5268 if (ParamTy->isVoidType()) {
5269 // If this is something like 'float(int, void)', reject it. 'void'
5270 // is an incomplete type (C99 6.2.5p19) and function decls cannot
5271 // have parameters of incomplete type.
5272 if (FTI.NumParams != 1 || FTI.isVariadic) {
5273 S.Diag(FTI.Params[i].IdentLoc, diag::err_void_only_param);
5274 ParamTy = Context.IntTy;
5275 Param->setType(ParamTy);
5276 } else if (FTI.Params[i].Ident) {
5277 // Reject, but continue to parse 'int(void abc)'.
5278 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
5279 ParamTy = Context.IntTy;
5280 Param->setType(ParamTy);
5281 } else {
5282 // Reject, but continue to parse 'float(const void)'.
5283 if (ParamTy.hasQualifiers())
5284 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
5285
5286 // Do not add 'void' to the list.
5287 break;
5288 }
5289 } else if (ParamTy->isHalfType()) {
5290 // Disallow half FP parameters.
5291 // FIXME: This really should be in BuildFunctionType.
5292 if (S.getLangOpts().OpenCL) {
5293 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5294 S.getLangOpts())) {
5295 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5296 << ParamTy << 0;
5297 D.setInvalidType();
5298 Param->setInvalidDecl();
5299 }
5300 } else if (!S.getLangOpts().HalfArgsAndReturns) {
5301 S.Diag(Param->getLocation(),
5302 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
5303 D.setInvalidType();
5304 }
5305 } else if (!FTI.hasPrototype) {
5306 if (ParamTy->isPromotableIntegerType()) {
5307 ParamTy = Context.getPromotedIntegerType(ParamTy);
5308 Param->setKNRPromoted(true);
5309 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
5310 if (BTy->getKind() == BuiltinType::Float) {
5311 ParamTy = Context.DoubleTy;
5312 Param->setKNRPromoted(true);
5313 }
5314 }
5315 } else if (S.getLangOpts().OpenCL && ParamTy->isBlockPointerType()) {
5316 // OpenCL 2.0 s6.12.5: A block cannot be a parameter of a function.
5317 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5318 << ParamTy << 1 /*hint off*/;
5319 D.setInvalidType();
5320 }
5321
5322 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
5323 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
5324 HasAnyInterestingExtParameterInfos = true;
5325 }
5326
5327 if (auto attr = Param->getAttr<ParameterABIAttr>()) {
5328 ExtParameterInfos[i] =
5329 ExtParameterInfos[i].withABI(attr->getABI());
5330 HasAnyInterestingExtParameterInfos = true;
5331 }
5332
5333 if (Param->hasAttr<PassObjectSizeAttr>()) {
5334 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
5335 HasAnyInterestingExtParameterInfos = true;
5336 }
5337
5338 if (Param->hasAttr<NoEscapeAttr>()) {
5339 ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true);
5340 HasAnyInterestingExtParameterInfos = true;
5341 }
5342
5343 ParamTys.push_back(ParamTy);
5344 }
5345
5346 if (HasAnyInterestingExtParameterInfos) {
5347 EPI.ExtParameterInfos = ExtParameterInfos.data();
5348 checkExtParameterInfos(S, ParamTys, EPI,
5349 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
5350 }
5351
5352 SmallVector<QualType, 4> Exceptions;
5353 SmallVector<ParsedType, 2> DynamicExceptions;
5354 SmallVector<SourceRange, 2> DynamicExceptionRanges;
5355 Expr *NoexceptExpr = nullptr;
5356
5357 if (FTI.getExceptionSpecType() == EST_Dynamic) {
5358 // FIXME: It's rather inefficient to have to split into two vectors
5359 // here.
5360 unsigned N = FTI.getNumExceptions();
5361 DynamicExceptions.reserve(N);
5362 DynamicExceptionRanges.reserve(N);
5363 for (unsigned I = 0; I != N; ++I) {
5364 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
5365 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
5366 }
5367 } else if (isComputedNoexcept(FTI.getExceptionSpecType())) {
5368 NoexceptExpr = FTI.NoexceptExpr;
5369 }
5370
5371 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
5372 FTI.getExceptionSpecType(),
5373 DynamicExceptions,
5374 DynamicExceptionRanges,
5375 NoexceptExpr,
5376 Exceptions,
5377 EPI.ExceptionSpec);
5378
5379 // FIXME: Set address space from attrs for C++ mode here.
5380 // OpenCLCPlusPlus: A class member function has an address space.
5381 auto IsClassMember = [&]() {
5382 return (!state.getDeclarator().getCXXScopeSpec().isEmpty() &&
5383 state.getDeclarator()
5384 .getCXXScopeSpec()
5385 .getScopeRep()
5386 ->getKind() == NestedNameSpecifier::TypeSpec) ||
5387 state.getDeclarator().getContext() ==
5388 DeclaratorContext::Member ||
5389 state.getDeclarator().getContext() ==
5390 DeclaratorContext::LambdaExpr;
5391 };
5392
5393 if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) {
5394 LangAS ASIdx = LangAS::Default;
5395 // Take address space attr if any and mark as invalid to avoid adding
5396 // them later while creating QualType.
5397 if (FTI.MethodQualifiers)
5398 for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) {
5399 LangAS ASIdxNew = attr.asOpenCLLangAS();
5400 if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew,
5401 attr.getLoc()))
5402 D.setInvalidType(true);
5403 else
5404 ASIdx = ASIdxNew;
5405 }
5406 // If a class member function's address space is not set, set it to
5407 // __generic.
5408 LangAS AS =
5409 (ASIdx == LangAS::Default ? S.getDefaultCXXMethodAddrSpace()
5410 : ASIdx);
5411 EPI.TypeQuals.addAddressSpace(AS);
5412 }
5413 T = Context.getFunctionType(T, ParamTys, EPI);
5414 }
5415 break;
5416 }
5417 case DeclaratorChunk::MemberPointer: {
5418 // The scope spec must refer to a class, or be dependent.
5419 CXXScopeSpec &SS = DeclType.Mem.Scope();
5420 QualType ClsType;
5421
5422 // Handle pointer nullability.
5423 inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc,
5424 DeclType.EndLoc, DeclType.getAttrs(),
5425 state.getDeclarator().getAttributePool());
5426
5427 if (SS.isInvalid()) {
5428 // Avoid emitting extra errors if we already errored on the scope.
5429 D.setInvalidType(true);
5430 } else if (S.isDependentScopeSpecifier(SS) ||
5431 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) {
5432 NestedNameSpecifier *NNS = SS.getScopeRep();
5433 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
5434 switch (NNS->getKind()) {
5435 case NestedNameSpecifier::Identifier:
5436 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
5437 NNS->getAsIdentifier());
5438 break;
5439
5440 case NestedNameSpecifier::Namespace:
5441 case NestedNameSpecifier::NamespaceAlias:
5442 case NestedNameSpecifier::Global:
5443 case NestedNameSpecifier::Super:
5444 llvm_unreachable("Nested-name-specifier must name a type");
5445
5446 case NestedNameSpecifier::TypeSpec:
5447 case NestedNameSpecifier::TypeSpecWithTemplate:
5448 ClsType = QualType(NNS->getAsType(), 0);
5449 // Note: if the NNS has a prefix and ClsType is a nondependent
5450 // TemplateSpecializationType, then the NNS prefix is NOT included
5451 // in ClsType; hence we wrap ClsType into an ElaboratedType.
5452 // NOTE: in particular, no wrap occurs if ClsType already is an
5453 // Elaborated, DependentName, or DependentTemplateSpecialization.
5454 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
5455 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
5456 break;
5457 }
5458 } else {
5459 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
5460 diag::err_illegal_decl_mempointer_in_nonclass)
5461 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
5462 << DeclType.Mem.Scope().getRange();
5463 D.setInvalidType(true);
5464 }
5465
5466 if (!ClsType.isNull())
5467 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
5468 D.getIdentifier());
5469 if (T.isNull()) {
5470 T = Context.IntTy;
5471 D.setInvalidType(true);
5472 } else if (DeclType.Mem.TypeQuals) {
5473 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
5474 }
5475 break;
5476 }
5477
5478 case DeclaratorChunk::Pipe: {
5479 T = S.BuildReadPipeType(T, DeclType.Loc);
5480 processTypeAttrs(state, T, TAL_DeclSpec,
5481 D.getMutableDeclSpec().getAttributes());
5482 break;
5483 }
5484 }
5485
5486 if (T.isNull()) {
5487 D.setInvalidType(true);
5488 T = Context.IntTy;
5489 }
5490
5491 // See if there are any attributes on this declarator chunk.
5492 processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs());
5493
5494 if (DeclType.Kind != DeclaratorChunk::Paren) {
5495 if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType))
5496 S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array);
5497
5498 ExpectNoDerefChunk = state.didParseNoDeref();
5499 }
5500 }
5501
5502 if (ExpectNoDerefChunk)
5503 S.Diag(state.getDeclarator().getBeginLoc(),
5504 diag::warn_noderef_on_non_pointer_or_array);
5505
5506 // GNU warning -Wstrict-prototypes
5507 // Warn if a function declaration is without a prototype.
5508 // This warning is issued for all kinds of unprototyped function
5509 // declarations (i.e. function type typedef, function pointer etc.)
5510 // C99 6.7.5.3p14:
5511 // The empty list in a function declarator that is not part of a definition
5512 // of that function specifies that no information about the number or types
5513 // of the parameters is supplied.
5514 if (!LangOpts.CPlusPlus &&
5515 D.getFunctionDefinitionKind() == FunctionDefinitionKind::Declaration) {
5516 bool IsBlock = false;
5517 for (const DeclaratorChunk &DeclType : D.type_objects()) {
5518 switch (DeclType.Kind) {
5519 case DeclaratorChunk::BlockPointer:
5520 IsBlock = true;
5521 break;
5522 case DeclaratorChunk::Function: {
5523 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5524 // We suppress the warning when there's no LParen location, as this
5525 // indicates the declaration was an implicit declaration, which gets
5526 // warned about separately via -Wimplicit-function-declaration.
5527 if (FTI.NumParams == 0 && !FTI.isVariadic && FTI.getLParenLoc().isValid())
5528 S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
5529 << IsBlock
5530 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
5531 IsBlock = false;
5532 break;
5533 }
5534 default:
5535 break;
5536 }
5537 }
5538 }
5539
5540 assert(!T.isNull() && "T must not be null after this point");
5541
5542 if (LangOpts.CPlusPlus && T->isFunctionType()) {
5543 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
5544 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
5545
5546 // C++ 8.3.5p4:
5547 // A cv-qualifier-seq shall only be part of the function type
5548 // for a nonstatic member function, the function type to which a pointer
5549 // to member refers, or the top-level function type of a function typedef
5550 // declaration.
5551 //
5552 // Core issue 547 also allows cv-qualifiers on function types that are
5553 // top-level template type arguments.
5554 enum { NonMember, Member, DeductionGuide } Kind = NonMember;
5555 if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName)
5556 Kind = DeductionGuide;
5557 else if (!D.getCXXScopeSpec().isSet()) {
5558 if ((D.getContext() == DeclaratorContext::Member ||
5559 D.getContext() == DeclaratorContext::LambdaExpr) &&
5560 !D.getDeclSpec().isFriendSpecified())
5561 Kind = Member;
5562 } else {
5563 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
5564 if (!DC || DC->isRecord())
5565 Kind = Member;
5566 }
5567
5568 // C++11 [dcl.fct]p6 (w/DR1417):
5569 // An attempt to specify a function type with a cv-qualifier-seq or a
5570 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
5571 // - the function type for a non-static member function,
5572 // - the function type to which a pointer to member refers,
5573 // - the top-level function type of a function typedef declaration or
5574 // alias-declaration,
5575 // - the type-id in the default argument of a type-parameter, or
5576 // - the type-id of a template-argument for a type-parameter
5577 //
5578 // FIXME: Checking this here is insufficient. We accept-invalid on:
5579 //
5580 // template<typename T> struct S { void f(T); };
5581 // S<int() const> s;
5582 //
5583 // ... for instance.
5584 if (IsQualifiedFunction &&
5585 !(Kind == Member &&
5586 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
5587 !IsTypedefName && D.getContext() != DeclaratorContext::TemplateArg &&
5588 D.getContext() != DeclaratorContext::TemplateTypeArg) {
5589 SourceLocation Loc = D.getBeginLoc();
5590 SourceRange RemovalRange;
5591 unsigned I;
5592 if (D.isFunctionDeclarator(I)) {
5593 SmallVector<SourceLocation, 4> RemovalLocs;
5594 const DeclaratorChunk &Chunk = D.getTypeObject(I);
5595 assert(Chunk.Kind == DeclaratorChunk::Function);
5596
5597 if (Chunk.Fun.hasRefQualifier())
5598 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
5599
5600 if (Chunk.Fun.hasMethodTypeQualifiers())
5601 Chunk.Fun.MethodQualifiers->forEachQualifier(
5602 [&](DeclSpec::TQ TypeQual, StringRef QualName,
5603 SourceLocation SL) { RemovalLocs.push_back(SL); });
5604
5605 if (!RemovalLocs.empty()) {
5606 llvm::sort(RemovalLocs,
5607 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
5608 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
5609 Loc = RemovalLocs.front();
5610 }
5611 }
5612
5613 S.Diag(Loc, diag::err_invalid_qualified_function_type)
5614 << Kind << D.isFunctionDeclarator() << T
5615 << getFunctionQualifiersAsString(FnTy)
5616 << FixItHint::CreateRemoval(RemovalRange);
5617
5618 // Strip the cv-qualifiers and ref-qualifiers from the type.
5619 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
5620 EPI.TypeQuals.removeCVRQualifiers();
5621 EPI.RefQualifier = RQ_None;
5622
5623 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
5624 EPI);
5625 // Rebuild any parens around the identifier in the function type.
5626 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5627 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
5628 break;
5629 T = S.BuildParenType(T);
5630 }
5631 }
5632 }
5633
5634 // Apply any undistributed attributes from the declarator.
5635 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());
5636
5637 // Diagnose any ignored type attributes.
5638 state.diagnoseIgnoredTypeAttrs(T);
5639
5640 // C++0x [dcl.constexpr]p9:
5641 // A constexpr specifier used in an object declaration declares the object
5642 // as const.
5643 if (D.getDeclSpec().getConstexprSpecifier() == ConstexprSpecKind::Constexpr &&
5644 T->isObjectType())
5645 T.addConst();
5646
5647 // C++2a [dcl.fct]p4:
5648 // A parameter with volatile-qualified type is deprecated
5649 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20 &&
5650 (D.getContext() == DeclaratorContext::Prototype ||
5651 D.getContext() == DeclaratorContext::LambdaExprParameter))
5652 S.Diag(D.getIdentifierLoc(), diag::warn_deprecated_volatile_param) << T;
5653
5654 // If there was an ellipsis in the declarator, the declaration declares a
5655 // parameter pack whose type may be a pack expansion type.
5656 if (D.hasEllipsis()) {
5657 // C++0x [dcl.fct]p13:
5658 // A declarator-id or abstract-declarator containing an ellipsis shall
5659 // only be used in a parameter-declaration. Such a parameter-declaration
5660 // is a parameter pack (14.5.3). [...]
5661 switch (D.getContext()) {
5662 case DeclaratorContext::Prototype:
5663 case DeclaratorContext::LambdaExprParameter:
5664 case DeclaratorContext::RequiresExpr:
5665 // C++0x [dcl.fct]p13:
5666 // [...] When it is part of a parameter-declaration-clause, the
5667 // parameter pack is a function parameter pack (14.5.3). The type T
5668 // of the declarator-id of the function parameter pack shall contain
5669 // a template parameter pack; each template parameter pack in T is
5670 // expanded by the function parameter pack.
5671 //
5672 // We represent function parameter packs as function parameters whose
5673 // type is a pack expansion.
5674 if (!T->containsUnexpandedParameterPack() &&
5675 (!LangOpts.CPlusPlus20 || !T->getContainedAutoType())) {
5676 S.Diag(D.getEllipsisLoc(),
5677 diag::err_function_parameter_pack_without_parameter_packs)
5678 << T << D.getSourceRange();
5679 D.setEllipsisLoc(SourceLocation());
5680 } else {
5681 T = Context.getPackExpansionType(T, None, /*ExpectPackInType=*/false);
5682 }
5683 break;
5684 case DeclaratorContext::TemplateParam:
5685 // C++0x [temp.param]p15:
5686 // If a template-parameter is a [...] is a parameter-declaration that
5687 // declares a parameter pack (8.3.5), then the template-parameter is a
5688 // template parameter pack (14.5.3).
5689 //
5690 // Note: core issue 778 clarifies that, if there are any unexpanded
5691 // parameter packs in the type of the non-type template parameter, then
5692 // it expands those parameter packs.
5693 if (T->containsUnexpandedParameterPack())
5694 T = Context.getPackExpansionType(T, None);
5695 else
5696 S.Diag(D.getEllipsisLoc(),
5697 LangOpts.CPlusPlus11
5698 ? diag::warn_cxx98_compat_variadic_templates
5699 : diag::ext_variadic_templates);
5700 break;
5701
5702 case DeclaratorContext::File:
5703 case DeclaratorContext::KNRTypeList:
5704 case DeclaratorContext::ObjCParameter: // FIXME: special diagnostic here?
5705 case DeclaratorContext::ObjCResult: // FIXME: special diagnostic here?
5706 case DeclaratorContext::TypeName:
5707 case DeclaratorContext::FunctionalCast:
5708 case DeclaratorContext::CXXNew:
5709 case DeclaratorContext::AliasDecl:
5710 case DeclaratorContext::AliasTemplate:
5711 case DeclaratorContext::Member:
5712 case DeclaratorContext::Block:
5713 case DeclaratorContext::ForInit:
5714 case DeclaratorContext::SelectionInit:
5715 case DeclaratorContext::Condition:
5716 case DeclaratorContext::CXXCatch:
5717 case DeclaratorContext::ObjCCatch:
5718 case DeclaratorContext::BlockLiteral:
5719 case DeclaratorContext::LambdaExpr:
5720 case DeclaratorContext::ConversionId:
5721 case DeclaratorContext::TrailingReturn:
5722 case DeclaratorContext::TrailingReturnVar:
5723 case DeclaratorContext::TemplateArg:
5724 case DeclaratorContext::TemplateTypeArg:
5725 // FIXME: We may want to allow parameter packs in block-literal contexts
5726 // in the future.
5727 S.Diag(D.getEllipsisLoc(),
5728 diag::err_ellipsis_in_declarator_not_parameter);
5729 D.setEllipsisLoc(SourceLocation());
5730 break;
5731 }
5732 }
5733
5734 assert(!T.isNull() && "T must not be null at the end of this function");
5735 if (D.isInvalidType())
5736 return Context.getTrivialTypeSourceInfo(T);
5737
5738 return GetTypeSourceInfoForDeclarator(state, T, TInfo);
5739 }
5740
5741 /// GetTypeForDeclarator - Convert the type for the specified
5742 /// declarator to Type instances.
5743 ///
5744 /// The result of this call will never be null, but the associated
5745 /// type may be a null type if there's an unrecoverable error.
GetTypeForDeclarator(Declarator & D,Scope * S)5746 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
5747 // Determine the type of the declarator. Not all forms of declarator
5748 // have a type.
5749
5750 TypeProcessingState state(*this, D);
5751
5752 TypeSourceInfo *ReturnTypeInfo = nullptr;
5753 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5754 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
5755 inferARCWriteback(state, T);
5756
5757 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
5758 }
5759
transferARCOwnershipToDeclSpec(Sema & S,QualType & declSpecTy,Qualifiers::ObjCLifetime ownership)5760 static void transferARCOwnershipToDeclSpec(Sema &S,
5761 QualType &declSpecTy,
5762 Qualifiers::ObjCLifetime ownership) {
5763 if (declSpecTy->isObjCRetainableType() &&
5764 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
5765 Qualifiers qs;
5766 qs.addObjCLifetime(ownership);
5767 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
5768 }
5769 }
5770
transferARCOwnershipToDeclaratorChunk(TypeProcessingState & state,Qualifiers::ObjCLifetime ownership,unsigned chunkIndex)5771 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
5772 Qualifiers::ObjCLifetime ownership,
5773 unsigned chunkIndex) {
5774 Sema &S = state.getSema();
5775 Declarator &D = state.getDeclarator();
5776
5777 // Look for an explicit lifetime attribute.
5778 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
5779 if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership))
5780 return;
5781
5782 const char *attrStr = nullptr;
5783 switch (ownership) {
5784 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
5785 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
5786 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
5787 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
5788 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
5789 }
5790
5791 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
5792 Arg->Ident = &S.Context.Idents.get(attrStr);
5793 Arg->Loc = SourceLocation();
5794
5795 ArgsUnion Args(Arg);
5796
5797 // If there wasn't one, add one (with an invalid source location
5798 // so that we don't make an AttributedType for it).
5799 ParsedAttr *attr = D.getAttributePool().create(
5800 &S.Context.Idents.get("objc_ownership"), SourceLocation(),
5801 /*scope*/ nullptr, SourceLocation(),
5802 /*args*/ &Args, 1, ParsedAttr::AS_GNU);
5803 chunk.getAttrs().addAtEnd(attr);
5804 // TODO: mark whether we did this inference?
5805 }
5806
5807 /// Used for transferring ownership in casts resulting in l-values.
transferARCOwnership(TypeProcessingState & state,QualType & declSpecTy,Qualifiers::ObjCLifetime ownership)5808 static void transferARCOwnership(TypeProcessingState &state,
5809 QualType &declSpecTy,
5810 Qualifiers::ObjCLifetime ownership) {
5811 Sema &S = state.getSema();
5812 Declarator &D = state.getDeclarator();
5813
5814 int inner = -1;
5815 bool hasIndirection = false;
5816 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5817 DeclaratorChunk &chunk = D.getTypeObject(i);
5818 switch (chunk.Kind) {
5819 case DeclaratorChunk::Paren:
5820 // Ignore parens.
5821 break;
5822
5823 case DeclaratorChunk::Array:
5824 case DeclaratorChunk::Reference:
5825 case DeclaratorChunk::Pointer:
5826 if (inner != -1)
5827 hasIndirection = true;
5828 inner = i;
5829 break;
5830
5831 case DeclaratorChunk::BlockPointer:
5832 if (inner != -1)
5833 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
5834 return;
5835
5836 case DeclaratorChunk::Function:
5837 case DeclaratorChunk::MemberPointer:
5838 case DeclaratorChunk::Pipe:
5839 return;
5840 }
5841 }
5842
5843 if (inner == -1)
5844 return;
5845
5846 DeclaratorChunk &chunk = D.getTypeObject(inner);
5847 if (chunk.Kind == DeclaratorChunk::Pointer) {
5848 if (declSpecTy->isObjCRetainableType())
5849 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5850 if (declSpecTy->isObjCObjectType() && hasIndirection)
5851 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
5852 } else {
5853 assert(chunk.Kind == DeclaratorChunk::Array ||
5854 chunk.Kind == DeclaratorChunk::Reference);
5855 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5856 }
5857 }
5858
GetTypeForDeclaratorCast(Declarator & D,QualType FromTy)5859 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
5860 TypeProcessingState state(*this, D);
5861
5862 TypeSourceInfo *ReturnTypeInfo = nullptr;
5863 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5864
5865 if (getLangOpts().ObjC) {
5866 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
5867 if (ownership != Qualifiers::OCL_None)
5868 transferARCOwnership(state, declSpecTy, ownership);
5869 }
5870
5871 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
5872 }
5873
fillAttributedTypeLoc(AttributedTypeLoc TL,TypeProcessingState & State)5874 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
5875 TypeProcessingState &State) {
5876 TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr()));
5877 }
5878
5879 namespace {
5880 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
5881 Sema &SemaRef;
5882 ASTContext &Context;
5883 TypeProcessingState &State;
5884 const DeclSpec &DS;
5885
5886 public:
TypeSpecLocFiller(Sema & S,ASTContext & Context,TypeProcessingState & State,const DeclSpec & DS)5887 TypeSpecLocFiller(Sema &S, ASTContext &Context, TypeProcessingState &State,
5888 const DeclSpec &DS)
5889 : SemaRef(S), Context(Context), State(State), DS(DS) {}
5890
VisitAttributedTypeLoc(AttributedTypeLoc TL)5891 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5892 Visit(TL.getModifiedLoc());
5893 fillAttributedTypeLoc(TL, State);
5894 }
VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL)5895 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
5896 Visit(TL.getInnerLoc());
5897 TL.setExpansionLoc(
5898 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
5899 }
VisitQualifiedTypeLoc(QualifiedTypeLoc TL)5900 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
5901 Visit(TL.getUnqualifiedLoc());
5902 }
VisitTypedefTypeLoc(TypedefTypeLoc TL)5903 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
5904 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5905 }
VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL)5906 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
5907 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5908 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
5909 // addition field. What we have is good enough for display of location
5910 // of 'fixit' on interface name.
5911 TL.setNameEndLoc(DS.getEndLoc());
5912 }
VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL)5913 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
5914 TypeSourceInfo *RepTInfo = nullptr;
5915 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5916 TL.copy(RepTInfo->getTypeLoc());
5917 }
VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL)5918 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
5919 TypeSourceInfo *RepTInfo = nullptr;
5920 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5921 TL.copy(RepTInfo->getTypeLoc());
5922 }
VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL)5923 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
5924 TypeSourceInfo *TInfo = nullptr;
5925 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5926
5927 // If we got no declarator info from previous Sema routines,
5928 // just fill with the typespec loc.
5929 if (!TInfo) {
5930 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
5931 return;
5932 }
5933
5934 TypeLoc OldTL = TInfo->getTypeLoc();
5935 if (TInfo->getType()->getAs<ElaboratedType>()) {
5936 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
5937 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
5938 .castAs<TemplateSpecializationTypeLoc>();
5939 TL.copy(NamedTL);
5940 } else {
5941 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
5942 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc());
5943 }
5944
5945 }
VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL)5946 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
5947 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
5948 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5949 TL.setParensRange(DS.getTypeofParensRange());
5950 }
VisitTypeOfTypeLoc(TypeOfTypeLoc TL)5951 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
5952 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
5953 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5954 TL.setParensRange(DS.getTypeofParensRange());
5955 assert(DS.getRepAsType());
5956 TypeSourceInfo *TInfo = nullptr;
5957 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5958 TL.setUnderlyingTInfo(TInfo);
5959 }
VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL)5960 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
5961 // FIXME: This holds only because we only have one unary transform.
5962 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType);
5963 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5964 TL.setParensRange(DS.getTypeofParensRange());
5965 assert(DS.getRepAsType());
5966 TypeSourceInfo *TInfo = nullptr;
5967 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5968 TL.setUnderlyingTInfo(TInfo);
5969 }
VisitBuiltinTypeLoc(BuiltinTypeLoc TL)5970 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
5971 // By default, use the source location of the type specifier.
5972 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
5973 if (TL.needsExtraLocalData()) {
5974 // Set info for the written builtin specifiers.
5975 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
5976 // Try to have a meaningful source location.
5977 if (TL.getWrittenSignSpec() != TypeSpecifierSign::Unspecified)
5978 TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
5979 if (TL.getWrittenWidthSpec() != TypeSpecifierWidth::Unspecified)
5980 TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
5981 }
5982 }
VisitElaboratedTypeLoc(ElaboratedTypeLoc TL)5983 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
5984 ElaboratedTypeKeyword Keyword
5985 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
5986 if (DS.getTypeSpecType() == TST_typename) {
5987 TypeSourceInfo *TInfo = nullptr;
5988 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5989 if (TInfo) {
5990 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>());
5991 return;
5992 }
5993 }
5994 TL.setElaboratedKeywordLoc(Keyword != ETK_None
5995 ? DS.getTypeSpecTypeLoc()
5996 : SourceLocation());
5997 const CXXScopeSpec& SS = DS.getTypeSpecScope();
5998 TL.setQualifierLoc(SS.getWithLocInContext(Context));
5999 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
6000 }
VisitDependentNameTypeLoc(DependentNameTypeLoc TL)6001 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
6002 assert(DS.getTypeSpecType() == TST_typename);
6003 TypeSourceInfo *TInfo = nullptr;
6004 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6005 assert(TInfo);
6006 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
6007 }
VisitDependentTemplateSpecializationTypeLoc(DependentTemplateSpecializationTypeLoc TL)6008 void VisitDependentTemplateSpecializationTypeLoc(
6009 DependentTemplateSpecializationTypeLoc TL) {
6010 assert(DS.getTypeSpecType() == TST_typename);
6011 TypeSourceInfo *TInfo = nullptr;
6012 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6013 assert(TInfo);
6014 TL.copy(
6015 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
6016 }
VisitAutoTypeLoc(AutoTypeLoc TL)6017 void VisitAutoTypeLoc(AutoTypeLoc TL) {
6018 assert(DS.getTypeSpecType() == TST_auto ||
6019 DS.getTypeSpecType() == TST_decltype_auto ||
6020 DS.getTypeSpecType() == TST_auto_type ||
6021 DS.getTypeSpecType() == TST_unspecified);
6022 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6023 if (!DS.isConstrainedAuto())
6024 return;
6025 TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId();
6026 if (!TemplateId)
6027 return;
6028 if (DS.getTypeSpecScope().isNotEmpty())
6029 TL.setNestedNameSpecifierLoc(
6030 DS.getTypeSpecScope().getWithLocInContext(Context));
6031 else
6032 TL.setNestedNameSpecifierLoc(NestedNameSpecifierLoc());
6033 TL.setTemplateKWLoc(TemplateId->TemplateKWLoc);
6034 TL.setConceptNameLoc(TemplateId->TemplateNameLoc);
6035 TL.setFoundDecl(nullptr);
6036 TL.setLAngleLoc(TemplateId->LAngleLoc);
6037 TL.setRAngleLoc(TemplateId->RAngleLoc);
6038 if (TemplateId->NumArgs == 0)
6039 return;
6040 TemplateArgumentListInfo TemplateArgsInfo;
6041 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
6042 TemplateId->NumArgs);
6043 SemaRef.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
6044 for (unsigned I = 0; I < TemplateId->NumArgs; ++I)
6045 TL.setArgLocInfo(I, TemplateArgsInfo.arguments()[I].getLocInfo());
6046 }
VisitTagTypeLoc(TagTypeLoc TL)6047 void VisitTagTypeLoc(TagTypeLoc TL) {
6048 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
6049 }
VisitAtomicTypeLoc(AtomicTypeLoc TL)6050 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
6051 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
6052 // or an _Atomic qualifier.
6053 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
6054 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6055 TL.setParensRange(DS.getTypeofParensRange());
6056
6057 TypeSourceInfo *TInfo = nullptr;
6058 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6059 assert(TInfo);
6060 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6061 } else {
6062 TL.setKWLoc(DS.getAtomicSpecLoc());
6063 // No parens, to indicate this was spelled as an _Atomic qualifier.
6064 TL.setParensRange(SourceRange());
6065 Visit(TL.getValueLoc());
6066 }
6067 }
6068
VisitPipeTypeLoc(PipeTypeLoc TL)6069 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6070 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6071
6072 TypeSourceInfo *TInfo = nullptr;
6073 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6074 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6075 }
6076
VisitExtIntTypeLoc(ExtIntTypeLoc TL)6077 void VisitExtIntTypeLoc(ExtIntTypeLoc TL) {
6078 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6079 }
6080
VisitDependentExtIntTypeLoc(DependentExtIntTypeLoc TL)6081 void VisitDependentExtIntTypeLoc(DependentExtIntTypeLoc TL) {
6082 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6083 }
6084
VisitTypeLoc(TypeLoc TL)6085 void VisitTypeLoc(TypeLoc TL) {
6086 // FIXME: add other typespec types and change this to an assert.
6087 TL.initialize(Context, DS.getTypeSpecTypeLoc());
6088 }
6089 };
6090
6091 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
6092 ASTContext &Context;
6093 TypeProcessingState &State;
6094 const DeclaratorChunk &Chunk;
6095
6096 public:
DeclaratorLocFiller(ASTContext & Context,TypeProcessingState & State,const DeclaratorChunk & Chunk)6097 DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State,
6098 const DeclaratorChunk &Chunk)
6099 : Context(Context), State(State), Chunk(Chunk) {}
6100
VisitQualifiedTypeLoc(QualifiedTypeLoc TL)6101 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
6102 llvm_unreachable("qualified type locs not expected here!");
6103 }
VisitDecayedTypeLoc(DecayedTypeLoc TL)6104 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
6105 llvm_unreachable("decayed type locs not expected here!");
6106 }
6107
VisitAttributedTypeLoc(AttributedTypeLoc TL)6108 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
6109 fillAttributedTypeLoc(TL, State);
6110 }
VisitAdjustedTypeLoc(AdjustedTypeLoc TL)6111 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
6112 // nothing
6113 }
VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL)6114 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
6115 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
6116 TL.setCaretLoc(Chunk.Loc);
6117 }
VisitPointerTypeLoc(PointerTypeLoc TL)6118 void VisitPointerTypeLoc(PointerTypeLoc TL) {
6119 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6120 TL.setStarLoc(Chunk.Loc);
6121 }
VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL)6122 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
6123 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6124 TL.setStarLoc(Chunk.Loc);
6125 }
VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL)6126 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
6127 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
6128 const CXXScopeSpec& SS = Chunk.Mem.Scope();
6129 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
6130
6131 const Type* ClsTy = TL.getClass();
6132 QualType ClsQT = QualType(ClsTy, 0);
6133 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
6134 // Now copy source location info into the type loc component.
6135 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
6136 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
6137 case NestedNameSpecifier::Identifier:
6138 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
6139 {
6140 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
6141 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
6142 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
6143 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
6144 }
6145 break;
6146
6147 case NestedNameSpecifier::TypeSpec:
6148 case NestedNameSpecifier::TypeSpecWithTemplate:
6149 if (isa<ElaboratedType>(ClsTy)) {
6150 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
6151 ETLoc.setElaboratedKeywordLoc(SourceLocation());
6152 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
6153 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
6154 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
6155 } else {
6156 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
6157 }
6158 break;
6159
6160 case NestedNameSpecifier::Namespace:
6161 case NestedNameSpecifier::NamespaceAlias:
6162 case NestedNameSpecifier::Global:
6163 case NestedNameSpecifier::Super:
6164 llvm_unreachable("Nested-name-specifier must name a type");
6165 }
6166
6167 // Finally fill in MemberPointerLocInfo fields.
6168 TL.setStarLoc(Chunk.Mem.StarLoc);
6169 TL.setClassTInfo(ClsTInfo);
6170 }
VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL)6171 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
6172 assert(Chunk.Kind == DeclaratorChunk::Reference);
6173 // 'Amp' is misleading: this might have been originally
6174 /// spelled with AmpAmp.
6175 TL.setAmpLoc(Chunk.Loc);
6176 }
VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL)6177 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
6178 assert(Chunk.Kind == DeclaratorChunk::Reference);
6179 assert(!Chunk.Ref.LValueRef);
6180 TL.setAmpAmpLoc(Chunk.Loc);
6181 }
VisitArrayTypeLoc(ArrayTypeLoc TL)6182 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
6183 assert(Chunk.Kind == DeclaratorChunk::Array);
6184 TL.setLBracketLoc(Chunk.Loc);
6185 TL.setRBracketLoc(Chunk.EndLoc);
6186 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
6187 }
VisitFunctionTypeLoc(FunctionTypeLoc TL)6188 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
6189 assert(Chunk.Kind == DeclaratorChunk::Function);
6190 TL.setLocalRangeBegin(Chunk.Loc);
6191 TL.setLocalRangeEnd(Chunk.EndLoc);
6192
6193 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
6194 TL.setLParenLoc(FTI.getLParenLoc());
6195 TL.setRParenLoc(FTI.getRParenLoc());
6196 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
6197 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
6198 TL.setParam(tpi++, Param);
6199 }
6200 TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
6201 }
VisitParenTypeLoc(ParenTypeLoc TL)6202 void VisitParenTypeLoc(ParenTypeLoc TL) {
6203 assert(Chunk.Kind == DeclaratorChunk::Paren);
6204 TL.setLParenLoc(Chunk.Loc);
6205 TL.setRParenLoc(Chunk.EndLoc);
6206 }
VisitPipeTypeLoc(PipeTypeLoc TL)6207 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6208 assert(Chunk.Kind == DeclaratorChunk::Pipe);
6209 TL.setKWLoc(Chunk.Loc);
6210 }
VisitExtIntTypeLoc(ExtIntTypeLoc TL)6211 void VisitExtIntTypeLoc(ExtIntTypeLoc TL) {
6212 TL.setNameLoc(Chunk.Loc);
6213 }
VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL)6214 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
6215 TL.setExpansionLoc(Chunk.Loc);
6216 }
VisitVectorTypeLoc(VectorTypeLoc TL)6217 void VisitVectorTypeLoc(VectorTypeLoc TL) { TL.setNameLoc(Chunk.Loc); }
VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL)6218 void VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL) {
6219 TL.setNameLoc(Chunk.Loc);
6220 }
VisitExtVectorTypeLoc(ExtVectorTypeLoc TL)6221 void VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
6222 TL.setNameLoc(Chunk.Loc);
6223 }
6224 void
VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL)6225 VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL) {
6226 TL.setNameLoc(Chunk.Loc);
6227 }
6228
VisitTypeLoc(TypeLoc TL)6229 void VisitTypeLoc(TypeLoc TL) {
6230 llvm_unreachable("unsupported TypeLoc kind in declarator!");
6231 }
6232 };
6233 } // end anonymous namespace
6234
fillAtomicQualLoc(AtomicTypeLoc ATL,const DeclaratorChunk & Chunk)6235 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
6236 SourceLocation Loc;
6237 switch (Chunk.Kind) {
6238 case DeclaratorChunk::Function:
6239 case DeclaratorChunk::Array:
6240 case DeclaratorChunk::Paren:
6241 case DeclaratorChunk::Pipe:
6242 llvm_unreachable("cannot be _Atomic qualified");
6243
6244 case DeclaratorChunk::Pointer:
6245 Loc = Chunk.Ptr.AtomicQualLoc;
6246 break;
6247
6248 case DeclaratorChunk::BlockPointer:
6249 case DeclaratorChunk::Reference:
6250 case DeclaratorChunk::MemberPointer:
6251 // FIXME: Provide a source location for the _Atomic keyword.
6252 break;
6253 }
6254
6255 ATL.setKWLoc(Loc);
6256 ATL.setParensRange(SourceRange());
6257 }
6258
6259 static void
fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,const ParsedAttributesView & Attrs)6260 fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,
6261 const ParsedAttributesView &Attrs) {
6262 for (const ParsedAttr &AL : Attrs) {
6263 if (AL.getKind() == ParsedAttr::AT_AddressSpace) {
6264 DASTL.setAttrNameLoc(AL.getLoc());
6265 DASTL.setAttrExprOperand(AL.getArgAsExpr(0));
6266 DASTL.setAttrOperandParensRange(SourceRange());
6267 return;
6268 }
6269 }
6270
6271 llvm_unreachable(
6272 "no address_space attribute found at the expected location!");
6273 }
6274
fillMatrixTypeLoc(MatrixTypeLoc MTL,const ParsedAttributesView & Attrs)6275 static void fillMatrixTypeLoc(MatrixTypeLoc MTL,
6276 const ParsedAttributesView &Attrs) {
6277 for (const ParsedAttr &AL : Attrs) {
6278 if (AL.getKind() == ParsedAttr::AT_MatrixType) {
6279 MTL.setAttrNameLoc(AL.getLoc());
6280 MTL.setAttrRowOperand(AL.getArgAsExpr(0));
6281 MTL.setAttrColumnOperand(AL.getArgAsExpr(1));
6282 MTL.setAttrOperandParensRange(SourceRange());
6283 return;
6284 }
6285 }
6286
6287 llvm_unreachable("no matrix_type attribute found at the expected location!");
6288 }
6289
6290 /// Create and instantiate a TypeSourceInfo with type source information.
6291 ///
6292 /// \param T QualType referring to the type as written in source code.
6293 ///
6294 /// \param ReturnTypeInfo For declarators whose return type does not show
6295 /// up in the normal place in the declaration specifiers (such as a C++
6296 /// conversion function), this pointer will refer to a type source information
6297 /// for that return type.
6298 static TypeSourceInfo *
GetTypeSourceInfoForDeclarator(TypeProcessingState & State,QualType T,TypeSourceInfo * ReturnTypeInfo)6299 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
6300 QualType T, TypeSourceInfo *ReturnTypeInfo) {
6301 Sema &S = State.getSema();
6302 Declarator &D = State.getDeclarator();
6303
6304 TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T);
6305 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
6306
6307 // Handle parameter packs whose type is a pack expansion.
6308 if (isa<PackExpansionType>(T)) {
6309 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
6310 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6311 }
6312
6313 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
6314 // An AtomicTypeLoc might be produced by an atomic qualifier in this
6315 // declarator chunk.
6316 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
6317 fillAtomicQualLoc(ATL, D.getTypeObject(i));
6318 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
6319 }
6320
6321 while (MacroQualifiedTypeLoc TL = CurrTL.getAs<MacroQualifiedTypeLoc>()) {
6322 TL.setExpansionLoc(
6323 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
6324 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6325 }
6326
6327 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
6328 fillAttributedTypeLoc(TL, State);
6329 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6330 }
6331
6332 while (DependentAddressSpaceTypeLoc TL =
6333 CurrTL.getAs<DependentAddressSpaceTypeLoc>()) {
6334 fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
6335 CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc();
6336 }
6337
6338 if (MatrixTypeLoc TL = CurrTL.getAs<MatrixTypeLoc>())
6339 fillMatrixTypeLoc(TL, D.getTypeObject(i).getAttrs());
6340
6341 // FIXME: Ordering here?
6342 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
6343 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6344
6345 DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL);
6346 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6347 }
6348
6349 // If we have different source information for the return type, use
6350 // that. This really only applies to C++ conversion functions.
6351 if (ReturnTypeInfo) {
6352 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
6353 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
6354 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
6355 } else {
6356 TypeSpecLocFiller(S, S.Context, State, D.getDeclSpec()).Visit(CurrTL);
6357 }
6358
6359 return TInfo;
6360 }
6361
6362 /// Create a LocInfoType to hold the given QualType and TypeSourceInfo.
CreateParsedType(QualType T,TypeSourceInfo * TInfo)6363 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
6364 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
6365 // and Sema during declaration parsing. Try deallocating/caching them when
6366 // it's appropriate, instead of allocating them and keeping them around.
6367 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
6368 TypeAlignment);
6369 new (LocT) LocInfoType(T, TInfo);
6370 assert(LocT->getTypeClass() != T->getTypeClass() &&
6371 "LocInfoType's TypeClass conflicts with an existing Type class");
6372 return ParsedType::make(QualType(LocT, 0));
6373 }
6374
getAsStringInternal(std::string & Str,const PrintingPolicy & Policy) const6375 void LocInfoType::getAsStringInternal(std::string &Str,
6376 const PrintingPolicy &Policy) const {
6377 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
6378 " was used directly instead of getting the QualType through"
6379 " GetTypeFromParser");
6380 }
6381
ActOnTypeName(Scope * S,Declarator & D)6382 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
6383 // C99 6.7.6: Type names have no identifier. This is already validated by
6384 // the parser.
6385 assert(D.getIdentifier() == nullptr &&
6386 "Type name should have no identifier!");
6387
6388 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6389 QualType T = TInfo->getType();
6390 if (D.isInvalidType())
6391 return true;
6392
6393 // Make sure there are no unused decl attributes on the declarator.
6394 // We don't want to do this for ObjC parameters because we're going
6395 // to apply them to the actual parameter declaration.
6396 // Likewise, we don't want to do this for alias declarations, because
6397 // we are actually going to build a declaration from this eventually.
6398 if (D.getContext() != DeclaratorContext::ObjCParameter &&
6399 D.getContext() != DeclaratorContext::AliasDecl &&
6400 D.getContext() != DeclaratorContext::AliasTemplate)
6401 checkUnusedDeclAttributes(D);
6402
6403 if (getLangOpts().CPlusPlus) {
6404 // Check that there are no default arguments (C++ only).
6405 CheckExtraCXXDefaultArguments(D);
6406 }
6407
6408 return CreateParsedType(T, TInfo);
6409 }
6410
ActOnObjCInstanceType(SourceLocation Loc)6411 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
6412 QualType T = Context.getObjCInstanceType();
6413 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
6414 return CreateParsedType(T, TInfo);
6415 }
6416
6417 //===----------------------------------------------------------------------===//
6418 // Type Attribute Processing
6419 //===----------------------------------------------------------------------===//
6420
6421 /// Build an AddressSpace index from a constant expression and diagnose any
6422 /// errors related to invalid address_spaces. Returns true on successfully
6423 /// building an AddressSpace index.
BuildAddressSpaceIndex(Sema & S,LangAS & ASIdx,const Expr * AddrSpace,SourceLocation AttrLoc)6424 static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx,
6425 const Expr *AddrSpace,
6426 SourceLocation AttrLoc) {
6427 if (!AddrSpace->isValueDependent()) {
6428 Optional<llvm::APSInt> OptAddrSpace =
6429 AddrSpace->getIntegerConstantExpr(S.Context);
6430 if (!OptAddrSpace) {
6431 S.Diag(AttrLoc, diag::err_attribute_argument_type)
6432 << "'address_space'" << AANT_ArgumentIntegerConstant
6433 << AddrSpace->getSourceRange();
6434 return false;
6435 }
6436 llvm::APSInt &addrSpace = *OptAddrSpace;
6437
6438 // Bounds checking.
6439 if (addrSpace.isSigned()) {
6440 if (addrSpace.isNegative()) {
6441 S.Diag(AttrLoc, diag::err_attribute_address_space_negative)
6442 << AddrSpace->getSourceRange();
6443 return false;
6444 }
6445 addrSpace.setIsSigned(false);
6446 }
6447
6448 llvm::APSInt max(addrSpace.getBitWidth());
6449 max =
6450 Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace;
6451
6452 if (addrSpace > max) {
6453 S.Diag(AttrLoc, diag::err_attribute_address_space_too_high)
6454 << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange();
6455 return false;
6456 }
6457
6458 ASIdx =
6459 getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue()));
6460 return true;
6461 }
6462
6463 // Default value for DependentAddressSpaceTypes
6464 ASIdx = LangAS::Default;
6465 return true;
6466 }
6467
6468 /// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression
6469 /// is uninstantiated. If instantiated it will apply the appropriate address
6470 /// space to the type. This function allows dependent template variables to be
6471 /// used in conjunction with the address_space attribute
BuildAddressSpaceAttr(QualType & T,LangAS ASIdx,Expr * AddrSpace,SourceLocation AttrLoc)6472 QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
6473 SourceLocation AttrLoc) {
6474 if (!AddrSpace->isValueDependent()) {
6475 if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx,
6476 AttrLoc))
6477 return QualType();
6478
6479 return Context.getAddrSpaceQualType(T, ASIdx);
6480 }
6481
6482 // A check with similar intentions as checking if a type already has an
6483 // address space except for on a dependent types, basically if the
6484 // current type is already a DependentAddressSpaceType then its already
6485 // lined up to have another address space on it and we can't have
6486 // multiple address spaces on the one pointer indirection
6487 if (T->getAs<DependentAddressSpaceType>()) {
6488 Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
6489 return QualType();
6490 }
6491
6492 return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc);
6493 }
6494
BuildAddressSpaceAttr(QualType & T,Expr * AddrSpace,SourceLocation AttrLoc)6495 QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
6496 SourceLocation AttrLoc) {
6497 LangAS ASIdx;
6498 if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc))
6499 return QualType();
6500 return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc);
6501 }
6502
6503 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
6504 /// specified type. The attribute contains 1 argument, the id of the address
6505 /// space for the type.
HandleAddressSpaceTypeAttribute(QualType & Type,const ParsedAttr & Attr,TypeProcessingState & State)6506 static void HandleAddressSpaceTypeAttribute(QualType &Type,
6507 const ParsedAttr &Attr,
6508 TypeProcessingState &State) {
6509 Sema &S = State.getSema();
6510
6511 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
6512 // qualified by an address-space qualifier."
6513 if (Type->isFunctionType()) {
6514 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
6515 Attr.setInvalid();
6516 return;
6517 }
6518
6519 LangAS ASIdx;
6520 if (Attr.getKind() == ParsedAttr::AT_AddressSpace) {
6521
6522 // Check the attribute arguments.
6523 if (Attr.getNumArgs() != 1) {
6524 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
6525 << 1;
6526 Attr.setInvalid();
6527 return;
6528 }
6529
6530 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
6531 LangAS ASIdx;
6532 if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) {
6533 Attr.setInvalid();
6534 return;
6535 }
6536
6537 ASTContext &Ctx = S.Context;
6538 auto *ASAttr =
6539 ::new (Ctx) AddressSpaceAttr(Ctx, Attr, static_cast<unsigned>(ASIdx));
6540
6541 // If the expression is not value dependent (not templated), then we can
6542 // apply the address space qualifiers just to the equivalent type.
6543 // Otherwise, we make an AttributedType with the modified and equivalent
6544 // type the same, and wrap it in a DependentAddressSpaceType. When this
6545 // dependent type is resolved, the qualifier is added to the equivalent type
6546 // later.
6547 QualType T;
6548 if (!ASArgExpr->isValueDependent()) {
6549 QualType EquivType =
6550 S.BuildAddressSpaceAttr(Type, ASIdx, ASArgExpr, Attr.getLoc());
6551 if (EquivType.isNull()) {
6552 Attr.setInvalid();
6553 return;
6554 }
6555 T = State.getAttributedType(ASAttr, Type, EquivType);
6556 } else {
6557 T = State.getAttributedType(ASAttr, Type, Type);
6558 T = S.BuildAddressSpaceAttr(T, ASIdx, ASArgExpr, Attr.getLoc());
6559 }
6560
6561 if (!T.isNull())
6562 Type = T;
6563 else
6564 Attr.setInvalid();
6565 } else {
6566 // The keyword-based type attributes imply which address space to use.
6567 ASIdx = S.getLangOpts().SYCLIsDevice ? Attr.asSYCLLangAS()
6568 : Attr.asOpenCLLangAS();
6569
6570 if (ASIdx == LangAS::Default)
6571 llvm_unreachable("Invalid address space");
6572
6573 if (DiagnoseMultipleAddrSpaceAttributes(S, Type.getAddressSpace(), ASIdx,
6574 Attr.getLoc())) {
6575 Attr.setInvalid();
6576 return;
6577 }
6578
6579 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
6580 }
6581 }
6582
6583 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
6584 /// attribute on the specified type.
6585 ///
6586 /// Returns 'true' if the attribute was handled.
handleObjCOwnershipTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)6587 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
6588 ParsedAttr &attr, QualType &type) {
6589 bool NonObjCPointer = false;
6590
6591 if (!type->isDependentType() && !type->isUndeducedType()) {
6592 if (const PointerType *ptr = type->getAs<PointerType>()) {
6593 QualType pointee = ptr->getPointeeType();
6594 if (pointee->isObjCRetainableType() || pointee->isPointerType())
6595 return false;
6596 // It is important not to lose the source info that there was an attribute
6597 // applied to non-objc pointer. We will create an attributed type but
6598 // its type will be the same as the original type.
6599 NonObjCPointer = true;
6600 } else if (!type->isObjCRetainableType()) {
6601 return false;
6602 }
6603
6604 // Don't accept an ownership attribute in the declspec if it would
6605 // just be the return type of a block pointer.
6606 if (state.isProcessingDeclSpec()) {
6607 Declarator &D = state.getDeclarator();
6608 if (maybeMovePastReturnType(D, D.getNumTypeObjects(),
6609 /*onlyBlockPointers=*/true))
6610 return false;
6611 }
6612 }
6613
6614 Sema &S = state.getSema();
6615 SourceLocation AttrLoc = attr.getLoc();
6616 if (AttrLoc.isMacroID())
6617 AttrLoc =
6618 S.getSourceManager().getImmediateExpansionRange(AttrLoc).getBegin();
6619
6620 if (!attr.isArgIdent(0)) {
6621 S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr
6622 << AANT_ArgumentString;
6623 attr.setInvalid();
6624 return true;
6625 }
6626
6627 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
6628 Qualifiers::ObjCLifetime lifetime;
6629 if (II->isStr("none"))
6630 lifetime = Qualifiers::OCL_ExplicitNone;
6631 else if (II->isStr("strong"))
6632 lifetime = Qualifiers::OCL_Strong;
6633 else if (II->isStr("weak"))
6634 lifetime = Qualifiers::OCL_Weak;
6635 else if (II->isStr("autoreleasing"))
6636 lifetime = Qualifiers::OCL_Autoreleasing;
6637 else {
6638 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr << II;
6639 attr.setInvalid();
6640 return true;
6641 }
6642
6643 // Just ignore lifetime attributes other than __weak and __unsafe_unretained
6644 // outside of ARC mode.
6645 if (!S.getLangOpts().ObjCAutoRefCount &&
6646 lifetime != Qualifiers::OCL_Weak &&
6647 lifetime != Qualifiers::OCL_ExplicitNone) {
6648 return true;
6649 }
6650
6651 SplitQualType underlyingType = type.split();
6652
6653 // Check for redundant/conflicting ownership qualifiers.
6654 if (Qualifiers::ObjCLifetime previousLifetime
6655 = type.getQualifiers().getObjCLifetime()) {
6656 // If it's written directly, that's an error.
6657 if (S.Context.hasDirectOwnershipQualifier(type)) {
6658 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
6659 << type;
6660 return true;
6661 }
6662
6663 // Otherwise, if the qualifiers actually conflict, pull sugar off
6664 // and remove the ObjCLifetime qualifiers.
6665 if (previousLifetime != lifetime) {
6666 // It's possible to have multiple local ObjCLifetime qualifiers. We
6667 // can't stop after we reach a type that is directly qualified.
6668 const Type *prevTy = nullptr;
6669 while (!prevTy || prevTy != underlyingType.Ty) {
6670 prevTy = underlyingType.Ty;
6671 underlyingType = underlyingType.getSingleStepDesugaredType();
6672 }
6673 underlyingType.Quals.removeObjCLifetime();
6674 }
6675 }
6676
6677 underlyingType.Quals.addObjCLifetime(lifetime);
6678
6679 if (NonObjCPointer) {
6680 StringRef name = attr.getAttrName()->getName();
6681 switch (lifetime) {
6682 case Qualifiers::OCL_None:
6683 case Qualifiers::OCL_ExplicitNone:
6684 break;
6685 case Qualifiers::OCL_Strong: name = "__strong"; break;
6686 case Qualifiers::OCL_Weak: name = "__weak"; break;
6687 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
6688 }
6689 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
6690 << TDS_ObjCObjOrBlock << type;
6691 }
6692
6693 // Don't actually add the __unsafe_unretained qualifier in non-ARC files,
6694 // because having both 'T' and '__unsafe_unretained T' exist in the type
6695 // system causes unfortunate widespread consistency problems. (For example,
6696 // they're not considered compatible types, and we mangle them identicially
6697 // as template arguments.) These problems are all individually fixable,
6698 // but it's easier to just not add the qualifier and instead sniff it out
6699 // in specific places using isObjCInertUnsafeUnretainedType().
6700 //
6701 // Doing this does means we miss some trivial consistency checks that
6702 // would've triggered in ARC, but that's better than trying to solve all
6703 // the coexistence problems with __unsafe_unretained.
6704 if (!S.getLangOpts().ObjCAutoRefCount &&
6705 lifetime == Qualifiers::OCL_ExplicitNone) {
6706 type = state.getAttributedType(
6707 createSimpleAttr<ObjCInertUnsafeUnretainedAttr>(S.Context, attr),
6708 type, type);
6709 return true;
6710 }
6711
6712 QualType origType = type;
6713 if (!NonObjCPointer)
6714 type = S.Context.getQualifiedType(underlyingType);
6715
6716 // If we have a valid source location for the attribute, use an
6717 // AttributedType instead.
6718 if (AttrLoc.isValid()) {
6719 type = state.getAttributedType(::new (S.Context)
6720 ObjCOwnershipAttr(S.Context, attr, II),
6721 origType, type);
6722 }
6723
6724 auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
6725 unsigned diagnostic, QualType type) {
6726 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
6727 S.DelayedDiagnostics.add(
6728 sema::DelayedDiagnostic::makeForbiddenType(
6729 S.getSourceManager().getExpansionLoc(loc),
6730 diagnostic, type, /*ignored*/ 0));
6731 } else {
6732 S.Diag(loc, diagnostic);
6733 }
6734 };
6735
6736 // Sometimes, __weak isn't allowed.
6737 if (lifetime == Qualifiers::OCL_Weak &&
6738 !S.getLangOpts().ObjCWeak && !NonObjCPointer) {
6739
6740 // Use a specialized diagnostic if the runtime just doesn't support them.
6741 unsigned diagnostic =
6742 (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled
6743 : diag::err_arc_weak_no_runtime);
6744
6745 // In any case, delay the diagnostic until we know what we're parsing.
6746 diagnoseOrDelay(S, AttrLoc, diagnostic, type);
6747
6748 attr.setInvalid();
6749 return true;
6750 }
6751
6752 // Forbid __weak for class objects marked as
6753 // objc_arc_weak_reference_unavailable
6754 if (lifetime == Qualifiers::OCL_Weak) {
6755 if (const ObjCObjectPointerType *ObjT =
6756 type->getAs<ObjCObjectPointerType>()) {
6757 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
6758 if (Class->isArcWeakrefUnavailable()) {
6759 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
6760 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
6761 diag::note_class_declared);
6762 }
6763 }
6764 }
6765 }
6766
6767 return true;
6768 }
6769
6770 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
6771 /// attribute on the specified type. Returns true to indicate that
6772 /// the attribute was handled, false to indicate that the type does
6773 /// not permit the attribute.
handleObjCGCTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)6774 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
6775 QualType &type) {
6776 Sema &S = state.getSema();
6777
6778 // Delay if this isn't some kind of pointer.
6779 if (!type->isPointerType() &&
6780 !type->isObjCObjectPointerType() &&
6781 !type->isBlockPointerType())
6782 return false;
6783
6784 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
6785 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
6786 attr.setInvalid();
6787 return true;
6788 }
6789
6790 // Check the attribute arguments.
6791 if (!attr.isArgIdent(0)) {
6792 S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
6793 << attr << AANT_ArgumentString;
6794 attr.setInvalid();
6795 return true;
6796 }
6797 Qualifiers::GC GCAttr;
6798 if (attr.getNumArgs() > 1) {
6799 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr
6800 << 1;
6801 attr.setInvalid();
6802 return true;
6803 }
6804
6805 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
6806 if (II->isStr("weak"))
6807 GCAttr = Qualifiers::Weak;
6808 else if (II->isStr("strong"))
6809 GCAttr = Qualifiers::Strong;
6810 else {
6811 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
6812 << attr << II;
6813 attr.setInvalid();
6814 return true;
6815 }
6816
6817 QualType origType = type;
6818 type = S.Context.getObjCGCQualType(origType, GCAttr);
6819
6820 // Make an attributed type to preserve the source information.
6821 if (attr.getLoc().isValid())
6822 type = state.getAttributedType(
6823 ::new (S.Context) ObjCGCAttr(S.Context, attr, II), origType, type);
6824
6825 return true;
6826 }
6827
6828 namespace {
6829 /// A helper class to unwrap a type down to a function for the
6830 /// purposes of applying attributes there.
6831 ///
6832 /// Use:
6833 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
6834 /// if (unwrapped.isFunctionType()) {
6835 /// const FunctionType *fn = unwrapped.get();
6836 /// // change fn somehow
6837 /// T = unwrapped.wrap(fn);
6838 /// }
6839 struct FunctionTypeUnwrapper {
6840 enum WrapKind {
6841 Desugar,
6842 Attributed,
6843 Parens,
6844 Array,
6845 Pointer,
6846 BlockPointer,
6847 Reference,
6848 MemberPointer,
6849 MacroQualified,
6850 };
6851
6852 QualType Original;
6853 const FunctionType *Fn;
6854 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
6855
FunctionTypeUnwrapper__anone2590ed01311::FunctionTypeUnwrapper6856 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
6857 while (true) {
6858 const Type *Ty = T.getTypePtr();
6859 if (isa<FunctionType>(Ty)) {
6860 Fn = cast<FunctionType>(Ty);
6861 return;
6862 } else if (isa<ParenType>(Ty)) {
6863 T = cast<ParenType>(Ty)->getInnerType();
6864 Stack.push_back(Parens);
6865 } else if (isa<ConstantArrayType>(Ty) || isa<VariableArrayType>(Ty) ||
6866 isa<IncompleteArrayType>(Ty)) {
6867 T = cast<ArrayType>(Ty)->getElementType();
6868 Stack.push_back(Array);
6869 } else if (isa<PointerType>(Ty)) {
6870 T = cast<PointerType>(Ty)->getPointeeType();
6871 Stack.push_back(Pointer);
6872 } else if (isa<BlockPointerType>(Ty)) {
6873 T = cast<BlockPointerType>(Ty)->getPointeeType();
6874 Stack.push_back(BlockPointer);
6875 } else if (isa<MemberPointerType>(Ty)) {
6876 T = cast<MemberPointerType>(Ty)->getPointeeType();
6877 Stack.push_back(MemberPointer);
6878 } else if (isa<ReferenceType>(Ty)) {
6879 T = cast<ReferenceType>(Ty)->getPointeeType();
6880 Stack.push_back(Reference);
6881 } else if (isa<AttributedType>(Ty)) {
6882 T = cast<AttributedType>(Ty)->getEquivalentType();
6883 Stack.push_back(Attributed);
6884 } else if (isa<MacroQualifiedType>(Ty)) {
6885 T = cast<MacroQualifiedType>(Ty)->getUnderlyingType();
6886 Stack.push_back(MacroQualified);
6887 } else {
6888 const Type *DTy = Ty->getUnqualifiedDesugaredType();
6889 if (Ty == DTy) {
6890 Fn = nullptr;
6891 return;
6892 }
6893
6894 T = QualType(DTy, 0);
6895 Stack.push_back(Desugar);
6896 }
6897 }
6898 }
6899
isFunctionType__anone2590ed01311::FunctionTypeUnwrapper6900 bool isFunctionType() const { return (Fn != nullptr); }
get__anone2590ed01311::FunctionTypeUnwrapper6901 const FunctionType *get() const { return Fn; }
6902
wrap__anone2590ed01311::FunctionTypeUnwrapper6903 QualType wrap(Sema &S, const FunctionType *New) {
6904 // If T wasn't modified from the unwrapped type, do nothing.
6905 if (New == get()) return Original;
6906
6907 Fn = New;
6908 return wrap(S.Context, Original, 0);
6909 }
6910
6911 private:
wrap__anone2590ed01311::FunctionTypeUnwrapper6912 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
6913 if (I == Stack.size())
6914 return C.getQualifiedType(Fn, Old.getQualifiers());
6915
6916 // Build up the inner type, applying the qualifiers from the old
6917 // type to the new type.
6918 SplitQualType SplitOld = Old.split();
6919
6920 // As a special case, tail-recurse if there are no qualifiers.
6921 if (SplitOld.Quals.empty())
6922 return wrap(C, SplitOld.Ty, I);
6923 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
6924 }
6925
wrap__anone2590ed01311::FunctionTypeUnwrapper6926 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
6927 if (I == Stack.size()) return QualType(Fn, 0);
6928
6929 switch (static_cast<WrapKind>(Stack[I++])) {
6930 case Desugar:
6931 // This is the point at which we potentially lose source
6932 // information.
6933 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
6934
6935 case Attributed:
6936 return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I);
6937
6938 case Parens: {
6939 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
6940 return C.getParenType(New);
6941 }
6942
6943 case MacroQualified:
6944 return wrap(C, cast<MacroQualifiedType>(Old)->getUnderlyingType(), I);
6945
6946 case Array: {
6947 if (const auto *CAT = dyn_cast<ConstantArrayType>(Old)) {
6948 QualType New = wrap(C, CAT->getElementType(), I);
6949 return C.getConstantArrayType(New, CAT->getSize(), CAT->getSizeExpr(),
6950 CAT->getSizeModifier(),
6951 CAT->getIndexTypeCVRQualifiers());
6952 }
6953
6954 if (const auto *VAT = dyn_cast<VariableArrayType>(Old)) {
6955 QualType New = wrap(C, VAT->getElementType(), I);
6956 return C.getVariableArrayType(
6957 New, VAT->getSizeExpr(), VAT->getSizeModifier(),
6958 VAT->getIndexTypeCVRQualifiers(), VAT->getBracketsRange());
6959 }
6960
6961 const auto *IAT = cast<IncompleteArrayType>(Old);
6962 QualType New = wrap(C, IAT->getElementType(), I);
6963 return C.getIncompleteArrayType(New, IAT->getSizeModifier(),
6964 IAT->getIndexTypeCVRQualifiers());
6965 }
6966
6967 case Pointer: {
6968 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
6969 return C.getPointerType(New);
6970 }
6971
6972 case BlockPointer: {
6973 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
6974 return C.getBlockPointerType(New);
6975 }
6976
6977 case MemberPointer: {
6978 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
6979 QualType New = wrap(C, OldMPT->getPointeeType(), I);
6980 return C.getMemberPointerType(New, OldMPT->getClass());
6981 }
6982
6983 case Reference: {
6984 const ReferenceType *OldRef = cast<ReferenceType>(Old);
6985 QualType New = wrap(C, OldRef->getPointeeType(), I);
6986 if (isa<LValueReferenceType>(OldRef))
6987 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
6988 else
6989 return C.getRValueReferenceType(New);
6990 }
6991 }
6992
6993 llvm_unreachable("unknown wrapping kind");
6994 }
6995 };
6996 } // end anonymous namespace
6997
handleMSPointerTypeQualifierAttr(TypeProcessingState & State,ParsedAttr & PAttr,QualType & Type)6998 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
6999 ParsedAttr &PAttr, QualType &Type) {
7000 Sema &S = State.getSema();
7001
7002 Attr *A;
7003 switch (PAttr.getKind()) {
7004 default: llvm_unreachable("Unknown attribute kind");
7005 case ParsedAttr::AT_Ptr32:
7006 A = createSimpleAttr<Ptr32Attr>(S.Context, PAttr);
7007 break;
7008 case ParsedAttr::AT_Ptr64:
7009 A = createSimpleAttr<Ptr64Attr>(S.Context, PAttr);
7010 break;
7011 case ParsedAttr::AT_SPtr:
7012 A = createSimpleAttr<SPtrAttr>(S.Context, PAttr);
7013 break;
7014 case ParsedAttr::AT_UPtr:
7015 A = createSimpleAttr<UPtrAttr>(S.Context, PAttr);
7016 break;
7017 }
7018
7019 std::bitset<attr::LastAttr> Attrs;
7020 attr::Kind NewAttrKind = A->getKind();
7021 QualType Desugared = Type;
7022 const AttributedType *AT = dyn_cast<AttributedType>(Type);
7023 while (AT) {
7024 Attrs[AT->getAttrKind()] = true;
7025 Desugared = AT->getModifiedType();
7026 AT = dyn_cast<AttributedType>(Desugared);
7027 }
7028
7029 // You cannot specify duplicate type attributes, so if the attribute has
7030 // already been applied, flag it.
7031 if (Attrs[NewAttrKind]) {
7032 S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
7033 return true;
7034 }
7035 Attrs[NewAttrKind] = true;
7036
7037 // You cannot have both __sptr and __uptr on the same type, nor can you
7038 // have __ptr32 and __ptr64.
7039 if (Attrs[attr::Ptr32] && Attrs[attr::Ptr64]) {
7040 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7041 << "'__ptr32'"
7042 << "'__ptr64'";
7043 return true;
7044 } else if (Attrs[attr::SPtr] && Attrs[attr::UPtr]) {
7045 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7046 << "'__sptr'"
7047 << "'__uptr'";
7048 return true;
7049 }
7050
7051 // Pointer type qualifiers can only operate on pointer types, but not
7052 // pointer-to-member types.
7053 //
7054 // FIXME: Should we really be disallowing this attribute if there is any
7055 // type sugar between it and the pointer (other than attributes)? Eg, this
7056 // disallows the attribute on a parenthesized pointer.
7057 // And if so, should we really allow *any* type attribute?
7058 if (!isa<PointerType>(Desugared)) {
7059 if (Type->isMemberPointerType())
7060 S.Diag(PAttr.getLoc(), diag::err_attribute_no_member_pointers) << PAttr;
7061 else
7062 S.Diag(PAttr.getLoc(), diag::err_attribute_pointers_only) << PAttr << 0;
7063 return true;
7064 }
7065
7066 // Add address space to type based on its attributes.
7067 LangAS ASIdx = LangAS::Default;
7068 uint64_t PtrWidth = S.Context.getTargetInfo().getPointerWidth(0);
7069 if (PtrWidth == 32) {
7070 if (Attrs[attr::Ptr64])
7071 ASIdx = LangAS::ptr64;
7072 else if (Attrs[attr::UPtr])
7073 ASIdx = LangAS::ptr32_uptr;
7074 } else if (PtrWidth == 64 && Attrs[attr::Ptr32]) {
7075 if (Attrs[attr::UPtr])
7076 ASIdx = LangAS::ptr32_uptr;
7077 else
7078 ASIdx = LangAS::ptr32_sptr;
7079 }
7080
7081 QualType Pointee = Type->getPointeeType();
7082 if (ASIdx != LangAS::Default)
7083 Pointee = S.Context.getAddrSpaceQualType(
7084 S.Context.removeAddrSpaceQualType(Pointee), ASIdx);
7085 Type = State.getAttributedType(A, Type, S.Context.getPointerType(Pointee));
7086 return false;
7087 }
7088
7089 /// Map a nullability attribute kind to a nullability kind.
mapNullabilityAttrKind(ParsedAttr::Kind kind)7090 static NullabilityKind mapNullabilityAttrKind(ParsedAttr::Kind kind) {
7091 switch (kind) {
7092 case ParsedAttr::AT_TypeNonNull:
7093 return NullabilityKind::NonNull;
7094
7095 case ParsedAttr::AT_TypeNullable:
7096 return NullabilityKind::Nullable;
7097
7098 case ParsedAttr::AT_TypeNullableResult:
7099 return NullabilityKind::NullableResult;
7100
7101 case ParsedAttr::AT_TypeNullUnspecified:
7102 return NullabilityKind::Unspecified;
7103
7104 default:
7105 llvm_unreachable("not a nullability attribute kind");
7106 }
7107 }
7108
7109 /// Applies a nullability type specifier to the given type, if possible.
7110 ///
7111 /// \param state The type processing state.
7112 ///
7113 /// \param type The type to which the nullability specifier will be
7114 /// added. On success, this type will be updated appropriately.
7115 ///
7116 /// \param attr The attribute as written on the type.
7117 ///
7118 /// \param allowOnArrayType Whether to accept nullability specifiers on an
7119 /// array type (e.g., because it will decay to a pointer).
7120 ///
7121 /// \returns true if a problem has been diagnosed, false on success.
checkNullabilityTypeSpecifier(TypeProcessingState & state,QualType & type,ParsedAttr & attr,bool allowOnArrayType)7122 static bool checkNullabilityTypeSpecifier(TypeProcessingState &state,
7123 QualType &type,
7124 ParsedAttr &attr,
7125 bool allowOnArrayType) {
7126 Sema &S = state.getSema();
7127
7128 NullabilityKind nullability = mapNullabilityAttrKind(attr.getKind());
7129 SourceLocation nullabilityLoc = attr.getLoc();
7130 bool isContextSensitive = attr.isContextSensitiveKeywordAttribute();
7131
7132 recordNullabilitySeen(S, nullabilityLoc);
7133
7134 // Check for existing nullability attributes on the type.
7135 QualType desugared = type;
7136 while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) {
7137 // Check whether there is already a null
7138 if (auto existingNullability = attributed->getImmediateNullability()) {
7139 // Duplicated nullability.
7140 if (nullability == *existingNullability) {
7141 S.Diag(nullabilityLoc, diag::warn_nullability_duplicate)
7142 << DiagNullabilityKind(nullability, isContextSensitive)
7143 << FixItHint::CreateRemoval(nullabilityLoc);
7144
7145 break;
7146 }
7147
7148 // Conflicting nullability.
7149 S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
7150 << DiagNullabilityKind(nullability, isContextSensitive)
7151 << DiagNullabilityKind(*existingNullability, false);
7152 return true;
7153 }
7154
7155 desugared = attributed->getModifiedType();
7156 }
7157
7158 // If there is already a different nullability specifier, complain.
7159 // This (unlike the code above) looks through typedefs that might
7160 // have nullability specifiers on them, which means we cannot
7161 // provide a useful Fix-It.
7162 if (auto existingNullability = desugared->getNullability(S.Context)) {
7163 if (nullability != *existingNullability) {
7164 S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
7165 << DiagNullabilityKind(nullability, isContextSensitive)
7166 << DiagNullabilityKind(*existingNullability, false);
7167
7168 // Try to find the typedef with the existing nullability specifier.
7169 if (auto typedefType = desugared->getAs<TypedefType>()) {
7170 TypedefNameDecl *typedefDecl = typedefType->getDecl();
7171 QualType underlyingType = typedefDecl->getUnderlyingType();
7172 if (auto typedefNullability
7173 = AttributedType::stripOuterNullability(underlyingType)) {
7174 if (*typedefNullability == *existingNullability) {
7175 S.Diag(typedefDecl->getLocation(), diag::note_nullability_here)
7176 << DiagNullabilityKind(*existingNullability, false);
7177 }
7178 }
7179 }
7180
7181 return true;
7182 }
7183 }
7184
7185 // If this definitely isn't a pointer type, reject the specifier.
7186 if (!desugared->canHaveNullability() &&
7187 !(allowOnArrayType && desugared->isArrayType())) {
7188 S.Diag(nullabilityLoc, diag::err_nullability_nonpointer)
7189 << DiagNullabilityKind(nullability, isContextSensitive) << type;
7190 return true;
7191 }
7192
7193 // For the context-sensitive keywords/Objective-C property
7194 // attributes, require that the type be a single-level pointer.
7195 if (isContextSensitive) {
7196 // Make sure that the pointee isn't itself a pointer type.
7197 const Type *pointeeType = nullptr;
7198 if (desugared->isArrayType())
7199 pointeeType = desugared->getArrayElementTypeNoTypeQual();
7200 else if (desugared->isAnyPointerType())
7201 pointeeType = desugared->getPointeeType().getTypePtr();
7202
7203 if (pointeeType && (pointeeType->isAnyPointerType() ||
7204 pointeeType->isObjCObjectPointerType() ||
7205 pointeeType->isMemberPointerType())) {
7206 S.Diag(nullabilityLoc, diag::err_nullability_cs_multilevel)
7207 << DiagNullabilityKind(nullability, true)
7208 << type;
7209 S.Diag(nullabilityLoc, diag::note_nullability_type_specifier)
7210 << DiagNullabilityKind(nullability, false)
7211 << type
7212 << FixItHint::CreateReplacement(nullabilityLoc,
7213 getNullabilitySpelling(nullability));
7214 return true;
7215 }
7216 }
7217
7218 // Form the attributed type.
7219 type = state.getAttributedType(
7220 createNullabilityAttr(S.Context, attr, nullability), type, type);
7221 return false;
7222 }
7223
7224 /// Check the application of the Objective-C '__kindof' qualifier to
7225 /// the given type.
checkObjCKindOfType(TypeProcessingState & state,QualType & type,ParsedAttr & attr)7226 static bool checkObjCKindOfType(TypeProcessingState &state, QualType &type,
7227 ParsedAttr &attr) {
7228 Sema &S = state.getSema();
7229
7230 if (isa<ObjCTypeParamType>(type)) {
7231 // Build the attributed type to record where __kindof occurred.
7232 type = state.getAttributedType(
7233 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, type);
7234 return false;
7235 }
7236
7237 // Find out if it's an Objective-C object or object pointer type;
7238 const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>();
7239 const ObjCObjectType *objType = ptrType ? ptrType->getObjectType()
7240 : type->getAs<ObjCObjectType>();
7241
7242 // If not, we can't apply __kindof.
7243 if (!objType) {
7244 // FIXME: Handle dependent types that aren't yet object types.
7245 S.Diag(attr.getLoc(), diag::err_objc_kindof_nonobject)
7246 << type;
7247 return true;
7248 }
7249
7250 // Rebuild the "equivalent" type, which pushes __kindof down into
7251 // the object type.
7252 // There is no need to apply kindof on an unqualified id type.
7253 QualType equivType = S.Context.getObjCObjectType(
7254 objType->getBaseType(), objType->getTypeArgsAsWritten(),
7255 objType->getProtocols(),
7256 /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true);
7257
7258 // If we started with an object pointer type, rebuild it.
7259 if (ptrType) {
7260 equivType = S.Context.getObjCObjectPointerType(equivType);
7261 if (auto nullability = type->getNullability(S.Context)) {
7262 // We create a nullability attribute from the __kindof attribute.
7263 // Make sure that will make sense.
7264 assert(attr.getAttributeSpellingListIndex() == 0 &&
7265 "multiple spellings for __kindof?");
7266 Attr *A = createNullabilityAttr(S.Context, attr, *nullability);
7267 A->setImplicit(true);
7268 equivType = state.getAttributedType(A, equivType, equivType);
7269 }
7270 }
7271
7272 // Build the attributed type to record where __kindof occurred.
7273 type = state.getAttributedType(
7274 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, equivType);
7275 return false;
7276 }
7277
7278 /// Distribute a nullability type attribute that cannot be applied to
7279 /// the type specifier to a pointer, block pointer, or member pointer
7280 /// declarator, complaining if necessary.
7281 ///
7282 /// \returns true if the nullability annotation was distributed, false
7283 /// otherwise.
distributeNullabilityTypeAttr(TypeProcessingState & state,QualType type,ParsedAttr & attr)7284 static bool distributeNullabilityTypeAttr(TypeProcessingState &state,
7285 QualType type, ParsedAttr &attr) {
7286 Declarator &declarator = state.getDeclarator();
7287
7288 /// Attempt to move the attribute to the specified chunk.
7289 auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool {
7290 // If there is already a nullability attribute there, don't add
7291 // one.
7292 if (hasNullabilityAttr(chunk.getAttrs()))
7293 return false;
7294
7295 // Complain about the nullability qualifier being in the wrong
7296 // place.
7297 enum {
7298 PK_Pointer,
7299 PK_BlockPointer,
7300 PK_MemberPointer,
7301 PK_FunctionPointer,
7302 PK_MemberFunctionPointer,
7303 } pointerKind
7304 = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer
7305 : PK_Pointer)
7306 : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer
7307 : inFunction? PK_MemberFunctionPointer : PK_MemberPointer;
7308
7309 auto diag = state.getSema().Diag(attr.getLoc(),
7310 diag::warn_nullability_declspec)
7311 << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()),
7312 attr.isContextSensitiveKeywordAttribute())
7313 << type
7314 << static_cast<unsigned>(pointerKind);
7315
7316 // FIXME: MemberPointer chunks don't carry the location of the *.
7317 if (chunk.Kind != DeclaratorChunk::MemberPointer) {
7318 diag << FixItHint::CreateRemoval(attr.getLoc())
7319 << FixItHint::CreateInsertion(
7320 state.getSema().getPreprocessor().getLocForEndOfToken(
7321 chunk.Loc),
7322 " " + attr.getAttrName()->getName().str() + " ");
7323 }
7324
7325 moveAttrFromListToList(attr, state.getCurrentAttributes(),
7326 chunk.getAttrs());
7327 return true;
7328 };
7329
7330 // Move it to the outermost pointer, member pointer, or block
7331 // pointer declarator.
7332 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
7333 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
7334 switch (chunk.Kind) {
7335 case DeclaratorChunk::Pointer:
7336 case DeclaratorChunk::BlockPointer:
7337 case DeclaratorChunk::MemberPointer:
7338 return moveToChunk(chunk, false);
7339
7340 case DeclaratorChunk::Paren:
7341 case DeclaratorChunk::Array:
7342 continue;
7343
7344 case DeclaratorChunk::Function:
7345 // Try to move past the return type to a function/block/member
7346 // function pointer.
7347 if (DeclaratorChunk *dest = maybeMovePastReturnType(
7348 declarator, i,
7349 /*onlyBlockPointers=*/false)) {
7350 return moveToChunk(*dest, true);
7351 }
7352
7353 return false;
7354
7355 // Don't walk through these.
7356 case DeclaratorChunk::Reference:
7357 case DeclaratorChunk::Pipe:
7358 return false;
7359 }
7360 }
7361
7362 return false;
7363 }
7364
getCCTypeAttr(ASTContext & Ctx,ParsedAttr & Attr)7365 static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) {
7366 assert(!Attr.isInvalid());
7367 switch (Attr.getKind()) {
7368 default:
7369 llvm_unreachable("not a calling convention attribute");
7370 case ParsedAttr::AT_CDecl:
7371 return createSimpleAttr<CDeclAttr>(Ctx, Attr);
7372 case ParsedAttr::AT_FastCall:
7373 return createSimpleAttr<FastCallAttr>(Ctx, Attr);
7374 case ParsedAttr::AT_StdCall:
7375 return createSimpleAttr<StdCallAttr>(Ctx, Attr);
7376 case ParsedAttr::AT_ThisCall:
7377 return createSimpleAttr<ThisCallAttr>(Ctx, Attr);
7378 case ParsedAttr::AT_RegCall:
7379 return createSimpleAttr<RegCallAttr>(Ctx, Attr);
7380 case ParsedAttr::AT_Pascal:
7381 return createSimpleAttr<PascalAttr>(Ctx, Attr);
7382 case ParsedAttr::AT_SwiftCall:
7383 return createSimpleAttr<SwiftCallAttr>(Ctx, Attr);
7384 case ParsedAttr::AT_SwiftAsyncCall:
7385 return createSimpleAttr<SwiftAsyncCallAttr>(Ctx, Attr);
7386 case ParsedAttr::AT_VectorCall:
7387 return createSimpleAttr<VectorCallAttr>(Ctx, Attr);
7388 case ParsedAttr::AT_AArch64VectorPcs:
7389 return createSimpleAttr<AArch64VectorPcsAttr>(Ctx, Attr);
7390 case ParsedAttr::AT_Pcs: {
7391 // The attribute may have had a fixit applied where we treated an
7392 // identifier as a string literal. The contents of the string are valid,
7393 // but the form may not be.
7394 StringRef Str;
7395 if (Attr.isArgExpr(0))
7396 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
7397 else
7398 Str = Attr.getArgAsIdent(0)->Ident->getName();
7399 PcsAttr::PCSType Type;
7400 if (!PcsAttr::ConvertStrToPCSType(Str, Type))
7401 llvm_unreachable("already validated the attribute");
7402 return ::new (Ctx) PcsAttr(Ctx, Attr, Type);
7403 }
7404 case ParsedAttr::AT_IntelOclBicc:
7405 return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr);
7406 case ParsedAttr::AT_MSABI:
7407 return createSimpleAttr<MSABIAttr>(Ctx, Attr);
7408 case ParsedAttr::AT_SysVABI:
7409 return createSimpleAttr<SysVABIAttr>(Ctx, Attr);
7410 case ParsedAttr::AT_PreserveMost:
7411 return createSimpleAttr<PreserveMostAttr>(Ctx, Attr);
7412 case ParsedAttr::AT_PreserveAll:
7413 return createSimpleAttr<PreserveAllAttr>(Ctx, Attr);
7414 }
7415 llvm_unreachable("unexpected attribute kind!");
7416 }
7417
7418 /// Process an individual function attribute. Returns true to
7419 /// indicate that the attribute was handled, false if it wasn't.
handleFunctionTypeAttr(TypeProcessingState & state,ParsedAttr & attr,QualType & type)7420 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
7421 QualType &type) {
7422 Sema &S = state.getSema();
7423
7424 FunctionTypeUnwrapper unwrapped(S, type);
7425
7426 if (attr.getKind() == ParsedAttr::AT_NoReturn) {
7427 if (S.CheckAttrNoArgs(attr))
7428 return true;
7429
7430 // Delay if this is not a function type.
7431 if (!unwrapped.isFunctionType())
7432 return false;
7433
7434 // Otherwise we can process right away.
7435 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
7436 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7437 return true;
7438 }
7439
7440 if (attr.getKind() == ParsedAttr::AT_CmseNSCall) {
7441 // Delay if this is not a function type.
7442 if (!unwrapped.isFunctionType())
7443 return false;
7444
7445 // Ignore if we don't have CMSE enabled.
7446 if (!S.getLangOpts().Cmse) {
7447 S.Diag(attr.getLoc(), diag::warn_attribute_ignored) << attr;
7448 attr.setInvalid();
7449 return true;
7450 }
7451
7452 // Otherwise we can process right away.
7453 FunctionType::ExtInfo EI =
7454 unwrapped.get()->getExtInfo().withCmseNSCall(true);
7455 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7456 return true;
7457 }
7458
7459 // ns_returns_retained is not always a type attribute, but if we got
7460 // here, we're treating it as one right now.
7461 if (attr.getKind() == ParsedAttr::AT_NSReturnsRetained) {
7462 if (attr.getNumArgs()) return true;
7463
7464 // Delay if this is not a function type.
7465 if (!unwrapped.isFunctionType())
7466 return false;
7467
7468 // Check whether the return type is reasonable.
7469 if (S.checkNSReturnsRetainedReturnType(attr.getLoc(),
7470 unwrapped.get()->getReturnType()))
7471 return true;
7472
7473 // Only actually change the underlying type in ARC builds.
7474 QualType origType = type;
7475 if (state.getSema().getLangOpts().ObjCAutoRefCount) {
7476 FunctionType::ExtInfo EI
7477 = unwrapped.get()->getExtInfo().withProducesResult(true);
7478 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7479 }
7480 type = state.getAttributedType(
7481 createSimpleAttr<NSReturnsRetainedAttr>(S.Context, attr),
7482 origType, type);
7483 return true;
7484 }
7485
7486 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCallerSavedRegisters) {
7487 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
7488 return true;
7489
7490 // Delay if this is not a function type.
7491 if (!unwrapped.isFunctionType())
7492 return false;
7493
7494 FunctionType::ExtInfo EI =
7495 unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true);
7496 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7497 return true;
7498 }
7499
7500 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCfCheck) {
7501 if (!S.getLangOpts().CFProtectionBranch) {
7502 S.Diag(attr.getLoc(), diag::warn_nocf_check_attribute_ignored);
7503 attr.setInvalid();
7504 return true;
7505 }
7506
7507 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
7508 return true;
7509
7510 // If this is not a function type, warning will be asserted by subject
7511 // check.
7512 if (!unwrapped.isFunctionType())
7513 return true;
7514
7515 FunctionType::ExtInfo EI =
7516 unwrapped.get()->getExtInfo().withNoCfCheck(true);
7517 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7518 return true;
7519 }
7520
7521 if (attr.getKind() == ParsedAttr::AT_Regparm) {
7522 unsigned value;
7523 if (S.CheckRegparmAttr(attr, value))
7524 return true;
7525
7526 // Delay if this is not a function type.
7527 if (!unwrapped.isFunctionType())
7528 return false;
7529
7530 // Diagnose regparm with fastcall.
7531 const FunctionType *fn = unwrapped.get();
7532 CallingConv CC = fn->getCallConv();
7533 if (CC == CC_X86FastCall) {
7534 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7535 << FunctionType::getNameForCallConv(CC)
7536 << "regparm";
7537 attr.setInvalid();
7538 return true;
7539 }
7540
7541 FunctionType::ExtInfo EI =
7542 unwrapped.get()->getExtInfo().withRegParm(value);
7543 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7544 return true;
7545 }
7546
7547 if (attr.getKind() == ParsedAttr::AT_NoThrow) {
7548 // Delay if this is not a function type.
7549 if (!unwrapped.isFunctionType())
7550 return false;
7551
7552 if (S.CheckAttrNoArgs(attr)) {
7553 attr.setInvalid();
7554 return true;
7555 }
7556
7557 // Otherwise we can process right away.
7558 auto *Proto = unwrapped.get()->castAs<FunctionProtoType>();
7559
7560 // MSVC ignores nothrow if it is in conflict with an explicit exception
7561 // specification.
7562 if (Proto->hasExceptionSpec()) {
7563 switch (Proto->getExceptionSpecType()) {
7564 case EST_None:
7565 llvm_unreachable("This doesn't have an exception spec!");
7566
7567 case EST_DynamicNone:
7568 case EST_BasicNoexcept:
7569 case EST_NoexceptTrue:
7570 case EST_NoThrow:
7571 // Exception spec doesn't conflict with nothrow, so don't warn.
7572 LLVM_FALLTHROUGH;
7573 case EST_Unparsed:
7574 case EST_Uninstantiated:
7575 case EST_DependentNoexcept:
7576 case EST_Unevaluated:
7577 // We don't have enough information to properly determine if there is a
7578 // conflict, so suppress the warning.
7579 break;
7580 case EST_Dynamic:
7581 case EST_MSAny:
7582 case EST_NoexceptFalse:
7583 S.Diag(attr.getLoc(), diag::warn_nothrow_attribute_ignored);
7584 break;
7585 }
7586 return true;
7587 }
7588
7589 type = unwrapped.wrap(
7590 S, S.Context
7591 .getFunctionTypeWithExceptionSpec(
7592 QualType{Proto, 0},
7593 FunctionProtoType::ExceptionSpecInfo{EST_NoThrow})
7594 ->getAs<FunctionType>());
7595 return true;
7596 }
7597
7598 // Delay if the type didn't work out to a function.
7599 if (!unwrapped.isFunctionType()) return false;
7600
7601 // Otherwise, a calling convention.
7602 CallingConv CC;
7603 if (S.CheckCallingConvAttr(attr, CC))
7604 return true;
7605
7606 const FunctionType *fn = unwrapped.get();
7607 CallingConv CCOld = fn->getCallConv();
7608 Attr *CCAttr = getCCTypeAttr(S.Context, attr);
7609
7610 if (CCOld != CC) {
7611 // Error out on when there's already an attribute on the type
7612 // and the CCs don't match.
7613 if (S.getCallingConvAttributedType(type)) {
7614 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7615 << FunctionType::getNameForCallConv(CC)
7616 << FunctionType::getNameForCallConv(CCOld);
7617 attr.setInvalid();
7618 return true;
7619 }
7620 }
7621
7622 // Diagnose use of variadic functions with calling conventions that
7623 // don't support them (e.g. because they're callee-cleanup).
7624 // We delay warning about this on unprototyped function declarations
7625 // until after redeclaration checking, just in case we pick up a
7626 // prototype that way. And apparently we also "delay" warning about
7627 // unprototyped function types in general, despite not necessarily having
7628 // much ability to diagnose it later.
7629 if (!supportsVariadicCall(CC)) {
7630 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
7631 if (FnP && FnP->isVariadic()) {
7632 // stdcall and fastcall are ignored with a warning for GCC and MS
7633 // compatibility.
7634 if (CC == CC_X86StdCall || CC == CC_X86FastCall)
7635 return S.Diag(attr.getLoc(), diag::warn_cconv_unsupported)
7636 << FunctionType::getNameForCallConv(CC)
7637 << (int)Sema::CallingConventionIgnoredReason::VariadicFunction;
7638
7639 attr.setInvalid();
7640 return S.Diag(attr.getLoc(), diag::err_cconv_varargs)
7641 << FunctionType::getNameForCallConv(CC);
7642 }
7643 }
7644
7645 // Also diagnose fastcall with regparm.
7646 if (CC == CC_X86FastCall && fn->getHasRegParm()) {
7647 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7648 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall);
7649 attr.setInvalid();
7650 return true;
7651 }
7652
7653 // Modify the CC from the wrapped function type, wrap it all back, and then
7654 // wrap the whole thing in an AttributedType as written. The modified type
7655 // might have a different CC if we ignored the attribute.
7656 QualType Equivalent;
7657 if (CCOld == CC) {
7658 Equivalent = type;
7659 } else {
7660 auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
7661 Equivalent =
7662 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7663 }
7664 type = state.getAttributedType(CCAttr, type, Equivalent);
7665 return true;
7666 }
7667
hasExplicitCallingConv(QualType T)7668 bool Sema::hasExplicitCallingConv(QualType T) {
7669 const AttributedType *AT;
7670
7671 // Stop if we'd be stripping off a typedef sugar node to reach the
7672 // AttributedType.
7673 while ((AT = T->getAs<AttributedType>()) &&
7674 AT->getAs<TypedefType>() == T->getAs<TypedefType>()) {
7675 if (AT->isCallingConv())
7676 return true;
7677 T = AT->getModifiedType();
7678 }
7679 return false;
7680 }
7681
adjustMemberFunctionCC(QualType & T,bool IsStatic,bool IsCtorOrDtor,SourceLocation Loc)7682 void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
7683 SourceLocation Loc) {
7684 FunctionTypeUnwrapper Unwrapped(*this, T);
7685 const FunctionType *FT = Unwrapped.get();
7686 bool IsVariadic = (isa<FunctionProtoType>(FT) &&
7687 cast<FunctionProtoType>(FT)->isVariadic());
7688 CallingConv CurCC = FT->getCallConv();
7689 CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic);
7690
7691 if (CurCC == ToCC)
7692 return;
7693
7694 // MS compiler ignores explicit calling convention attributes on structors. We
7695 // should do the same.
7696 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) {
7697 // Issue a warning on ignored calling convention -- except of __stdcall.
7698 // Again, this is what MS compiler does.
7699 if (CurCC != CC_X86StdCall)
7700 Diag(Loc, diag::warn_cconv_unsupported)
7701 << FunctionType::getNameForCallConv(CurCC)
7702 << (int)Sema::CallingConventionIgnoredReason::ConstructorDestructor;
7703 // Default adjustment.
7704 } else {
7705 // Only adjust types with the default convention. For example, on Windows
7706 // we should adjust a __cdecl type to __thiscall for instance methods, and a
7707 // __thiscall type to __cdecl for static methods.
7708 CallingConv DefaultCC =
7709 Context.getDefaultCallingConvention(IsVariadic, IsStatic);
7710
7711 if (CurCC != DefaultCC || DefaultCC == ToCC)
7712 return;
7713
7714 if (hasExplicitCallingConv(T))
7715 return;
7716 }
7717
7718 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
7719 QualType Wrapped = Unwrapped.wrap(*this, FT);
7720 T = Context.getAdjustedType(T, Wrapped);
7721 }
7722
7723 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
7724 /// and float scalars, although arrays, pointers, and function return values are
7725 /// allowed in conjunction with this construct. Aggregates with this attribute
7726 /// are invalid, even if they are of the same size as a corresponding scalar.
7727 /// The raw attribute should contain precisely 1 argument, the vector size for
7728 /// the variable, measured in bytes. If curType and rawAttr are well formed,
7729 /// this routine will return a new vector type.
HandleVectorSizeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)7730 static void HandleVectorSizeAttr(QualType &CurType, const ParsedAttr &Attr,
7731 Sema &S) {
7732 // Check the attribute arguments.
7733 if (Attr.getNumArgs() != 1) {
7734 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
7735 << 1;
7736 Attr.setInvalid();
7737 return;
7738 }
7739
7740 Expr *SizeExpr = Attr.getArgAsExpr(0);
7741 QualType T = S.BuildVectorType(CurType, SizeExpr, Attr.getLoc());
7742 if (!T.isNull())
7743 CurType = T;
7744 else
7745 Attr.setInvalid();
7746 }
7747
7748 /// Process the OpenCL-like ext_vector_type attribute when it occurs on
7749 /// a type.
HandleExtVectorTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)7750 static void HandleExtVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
7751 Sema &S) {
7752 // check the attribute arguments.
7753 if (Attr.getNumArgs() != 1) {
7754 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
7755 << 1;
7756 return;
7757 }
7758
7759 Expr *SizeExpr = Attr.getArgAsExpr(0);
7760 QualType T = S.BuildExtVectorType(CurType, SizeExpr, Attr.getLoc());
7761 if (!T.isNull())
7762 CurType = T;
7763 }
7764
isPermittedNeonBaseType(QualType & Ty,VectorType::VectorKind VecKind,Sema & S)7765 static bool isPermittedNeonBaseType(QualType &Ty,
7766 VectorType::VectorKind VecKind, Sema &S) {
7767 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
7768 if (!BTy)
7769 return false;
7770
7771 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
7772
7773 // Signed poly is mathematically wrong, but has been baked into some ABIs by
7774 // now.
7775 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
7776 Triple.getArch() == llvm::Triple::aarch64_32 ||
7777 Triple.getArch() == llvm::Triple::aarch64_be;
7778 if (VecKind == VectorType::NeonPolyVector) {
7779 if (IsPolyUnsigned) {
7780 // AArch64 polynomial vectors are unsigned.
7781 return BTy->getKind() == BuiltinType::UChar ||
7782 BTy->getKind() == BuiltinType::UShort ||
7783 BTy->getKind() == BuiltinType::ULong ||
7784 BTy->getKind() == BuiltinType::ULongLong;
7785 } else {
7786 // AArch32 polynomial vectors are signed.
7787 return BTy->getKind() == BuiltinType::SChar ||
7788 BTy->getKind() == BuiltinType::Short ||
7789 BTy->getKind() == BuiltinType::LongLong;
7790 }
7791 }
7792
7793 // Non-polynomial vector types: the usual suspects are allowed, as well as
7794 // float64_t on AArch64.
7795 if ((Triple.isArch64Bit() || Triple.getArch() == llvm::Triple::aarch64_32) &&
7796 BTy->getKind() == BuiltinType::Double)
7797 return true;
7798
7799 return BTy->getKind() == BuiltinType::SChar ||
7800 BTy->getKind() == BuiltinType::UChar ||
7801 BTy->getKind() == BuiltinType::Short ||
7802 BTy->getKind() == BuiltinType::UShort ||
7803 BTy->getKind() == BuiltinType::Int ||
7804 BTy->getKind() == BuiltinType::UInt ||
7805 BTy->getKind() == BuiltinType::Long ||
7806 BTy->getKind() == BuiltinType::ULong ||
7807 BTy->getKind() == BuiltinType::LongLong ||
7808 BTy->getKind() == BuiltinType::ULongLong ||
7809 BTy->getKind() == BuiltinType::Float ||
7810 BTy->getKind() == BuiltinType::Half ||
7811 BTy->getKind() == BuiltinType::BFloat16;
7812 }
7813
verifyValidIntegerConstantExpr(Sema & S,const ParsedAttr & Attr,llvm::APSInt & Result)7814 static bool verifyValidIntegerConstantExpr(Sema &S, const ParsedAttr &Attr,
7815 llvm::APSInt &Result) {
7816 const auto *AttrExpr = Attr.getArgAsExpr(0);
7817 if (!AttrExpr->isTypeDependent() && !AttrExpr->isValueDependent()) {
7818 if (Optional<llvm::APSInt> Res =
7819 AttrExpr->getIntegerConstantExpr(S.Context)) {
7820 Result = *Res;
7821 return true;
7822 }
7823 }
7824 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
7825 << Attr << AANT_ArgumentIntegerConstant << AttrExpr->getSourceRange();
7826 Attr.setInvalid();
7827 return false;
7828 }
7829
7830 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
7831 /// "neon_polyvector_type" attributes are used to create vector types that
7832 /// are mangled according to ARM's ABI. Otherwise, these types are identical
7833 /// to those created with the "vector_size" attribute. Unlike "vector_size"
7834 /// the argument to these Neon attributes is the number of vector elements,
7835 /// not the vector size in bytes. The vector width and element type must
7836 /// match one of the standard Neon vector types.
HandleNeonVectorTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S,VectorType::VectorKind VecKind)7837 static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
7838 Sema &S, VectorType::VectorKind VecKind) {
7839 // Target must have NEON (or MVE, whose vectors are similar enough
7840 // not to need a separate attribute)
7841 if (!S.Context.getTargetInfo().hasFeature("neon") &&
7842 !S.Context.getTargetInfo().hasFeature("mve")) {
7843 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
7844 << Attr << "'neon' or 'mve'";
7845 Attr.setInvalid();
7846 return;
7847 }
7848 // Check the attribute arguments.
7849 if (Attr.getNumArgs() != 1) {
7850 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
7851 << 1;
7852 Attr.setInvalid();
7853 return;
7854 }
7855 // The number of elements must be an ICE.
7856 llvm::APSInt numEltsInt(32);
7857 if (!verifyValidIntegerConstantExpr(S, Attr, numEltsInt))
7858 return;
7859
7860 // Only certain element types are supported for Neon vectors.
7861 if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
7862 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
7863 Attr.setInvalid();
7864 return;
7865 }
7866
7867 // The total size of the vector must be 64 or 128 bits.
7868 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
7869 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
7870 unsigned vecSize = typeSize * numElts;
7871 if (vecSize != 64 && vecSize != 128) {
7872 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
7873 Attr.setInvalid();
7874 return;
7875 }
7876
7877 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
7878 }
7879
7880 /// HandleArmSveVectorBitsTypeAttr - The "arm_sve_vector_bits" attribute is
7881 /// used to create fixed-length versions of sizeless SVE types defined by
7882 /// the ACLE, such as svint32_t and svbool_t.
HandleArmSveVectorBitsTypeAttr(QualType & CurType,ParsedAttr & Attr,Sema & S)7883 static void HandleArmSveVectorBitsTypeAttr(QualType &CurType, ParsedAttr &Attr,
7884 Sema &S) {
7885 // Target must have SVE.
7886 if (!S.Context.getTargetInfo().hasFeature("sve")) {
7887 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr << "'sve'";
7888 Attr.setInvalid();
7889 return;
7890 }
7891
7892 // Attribute is unsupported if '-msve-vector-bits=<bits>' isn't specified.
7893 if (!S.getLangOpts().ArmSveVectorBits) {
7894 S.Diag(Attr.getLoc(), diag::err_attribute_arm_feature_sve_bits_unsupported)
7895 << Attr;
7896 Attr.setInvalid();
7897 return;
7898 }
7899
7900 // Check the attribute arguments.
7901 if (Attr.getNumArgs() != 1) {
7902 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
7903 << Attr << 1;
7904 Attr.setInvalid();
7905 return;
7906 }
7907
7908 // The vector size must be an integer constant expression.
7909 llvm::APSInt SveVectorSizeInBits(32);
7910 if (!verifyValidIntegerConstantExpr(S, Attr, SveVectorSizeInBits))
7911 return;
7912
7913 unsigned VecSize = static_cast<unsigned>(SveVectorSizeInBits.getZExtValue());
7914
7915 // The attribute vector size must match -msve-vector-bits.
7916 if (VecSize != S.getLangOpts().ArmSveVectorBits) {
7917 S.Diag(Attr.getLoc(), diag::err_attribute_bad_sve_vector_size)
7918 << VecSize << S.getLangOpts().ArmSveVectorBits;
7919 Attr.setInvalid();
7920 return;
7921 }
7922
7923 // Attribute can only be attached to a single SVE vector or predicate type.
7924 if (!CurType->isVLSTBuiltinType()) {
7925 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_sve_type)
7926 << Attr << CurType;
7927 Attr.setInvalid();
7928 return;
7929 }
7930
7931 const auto *BT = CurType->castAs<BuiltinType>();
7932
7933 QualType EltType = CurType->getSveEltType(S.Context);
7934 unsigned TypeSize = S.Context.getTypeSize(EltType);
7935 VectorType::VectorKind VecKind = VectorType::SveFixedLengthDataVector;
7936 if (BT->getKind() == BuiltinType::SveBool) {
7937 // Predicates are represented as i8.
7938 VecSize /= S.Context.getCharWidth() * S.Context.getCharWidth();
7939 VecKind = VectorType::SveFixedLengthPredicateVector;
7940 } else
7941 VecSize /= TypeSize;
7942 CurType = S.Context.getVectorType(EltType, VecSize, VecKind);
7943 }
7944
HandleArmMveStrictPolymorphismAttr(TypeProcessingState & State,QualType & CurType,ParsedAttr & Attr)7945 static void HandleArmMveStrictPolymorphismAttr(TypeProcessingState &State,
7946 QualType &CurType,
7947 ParsedAttr &Attr) {
7948 const VectorType *VT = dyn_cast<VectorType>(CurType);
7949 if (!VT || VT->getVectorKind() != VectorType::NeonVector) {
7950 State.getSema().Diag(Attr.getLoc(),
7951 diag::err_attribute_arm_mve_polymorphism);
7952 Attr.setInvalid();
7953 return;
7954 }
7955
7956 CurType =
7957 State.getAttributedType(createSimpleAttr<ArmMveStrictPolymorphismAttr>(
7958 State.getSema().Context, Attr),
7959 CurType, CurType);
7960 }
7961
7962 /// Handle OpenCL Access Qualifier Attribute.
HandleOpenCLAccessAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)7963 static void HandleOpenCLAccessAttr(QualType &CurType, const ParsedAttr &Attr,
7964 Sema &S) {
7965 // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type.
7966 if (!(CurType->isImageType() || CurType->isPipeType())) {
7967 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier);
7968 Attr.setInvalid();
7969 return;
7970 }
7971
7972 if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) {
7973 QualType BaseTy = TypedefTy->desugar();
7974
7975 std::string PrevAccessQual;
7976 if (BaseTy->isPipeType()) {
7977 if (TypedefTy->getDecl()->hasAttr<OpenCLAccessAttr>()) {
7978 OpenCLAccessAttr *Attr =
7979 TypedefTy->getDecl()->getAttr<OpenCLAccessAttr>();
7980 PrevAccessQual = Attr->getSpelling();
7981 } else {
7982 PrevAccessQual = "read_only";
7983 }
7984 } else if (const BuiltinType* ImgType = BaseTy->getAs<BuiltinType>()) {
7985
7986 switch (ImgType->getKind()) {
7987 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
7988 case BuiltinType::Id: \
7989 PrevAccessQual = #Access; \
7990 break;
7991 #include "clang/Basic/OpenCLImageTypes.def"
7992 default:
7993 llvm_unreachable("Unable to find corresponding image type.");
7994 }
7995 } else {
7996 llvm_unreachable("unexpected type");
7997 }
7998 StringRef AttrName = Attr.getAttrName()->getName();
7999 if (PrevAccessQual == AttrName.ltrim("_")) {
8000 // Duplicated qualifiers
8001 S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec)
8002 << AttrName << Attr.getRange();
8003 } else {
8004 // Contradicting qualifiers
8005 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
8006 }
8007
8008 S.Diag(TypedefTy->getDecl()->getBeginLoc(),
8009 diag::note_opencl_typedef_access_qualifier) << PrevAccessQual;
8010 } else if (CurType->isPipeType()) {
8011 if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) {
8012 QualType ElemType = CurType->castAs<PipeType>()->getElementType();
8013 CurType = S.Context.getWritePipeType(ElemType);
8014 }
8015 }
8016 }
8017
8018 /// HandleMatrixTypeAttr - "matrix_type" attribute, like ext_vector_type
HandleMatrixTypeAttr(QualType & CurType,const ParsedAttr & Attr,Sema & S)8019 static void HandleMatrixTypeAttr(QualType &CurType, const ParsedAttr &Attr,
8020 Sema &S) {
8021 if (!S.getLangOpts().MatrixTypes) {
8022 S.Diag(Attr.getLoc(), diag::err_builtin_matrix_disabled);
8023 return;
8024 }
8025
8026 if (Attr.getNumArgs() != 2) {
8027 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8028 << Attr << 2;
8029 return;
8030 }
8031
8032 Expr *RowsExpr = Attr.getArgAsExpr(0);
8033 Expr *ColsExpr = Attr.getArgAsExpr(1);
8034 QualType T = S.BuildMatrixType(CurType, RowsExpr, ColsExpr, Attr.getLoc());
8035 if (!T.isNull())
8036 CurType = T;
8037 }
8038
HandleLifetimeBoundAttr(TypeProcessingState & State,QualType & CurType,ParsedAttr & Attr)8039 static void HandleLifetimeBoundAttr(TypeProcessingState &State,
8040 QualType &CurType,
8041 ParsedAttr &Attr) {
8042 if (State.getDeclarator().isDeclarationOfFunction()) {
8043 CurType = State.getAttributedType(
8044 createSimpleAttr<LifetimeBoundAttr>(State.getSema().Context, Attr),
8045 CurType, CurType);
8046 }
8047 }
8048
isAddressSpaceKind(const ParsedAttr & attr)8049 static bool isAddressSpaceKind(const ParsedAttr &attr) {
8050 auto attrKind = attr.getKind();
8051
8052 return attrKind == ParsedAttr::AT_AddressSpace ||
8053 attrKind == ParsedAttr::AT_OpenCLPrivateAddressSpace ||
8054 attrKind == ParsedAttr::AT_OpenCLGlobalAddressSpace ||
8055 attrKind == ParsedAttr::AT_OpenCLGlobalDeviceAddressSpace ||
8056 attrKind == ParsedAttr::AT_OpenCLGlobalHostAddressSpace ||
8057 attrKind == ParsedAttr::AT_OpenCLLocalAddressSpace ||
8058 attrKind == ParsedAttr::AT_OpenCLConstantAddressSpace ||
8059 attrKind == ParsedAttr::AT_OpenCLGenericAddressSpace;
8060 }
8061
processTypeAttrs(TypeProcessingState & state,QualType & type,TypeAttrLocation TAL,ParsedAttributesView & attrs)8062 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
8063 TypeAttrLocation TAL,
8064 ParsedAttributesView &attrs) {
8065 // Scan through and apply attributes to this type where it makes sense. Some
8066 // attributes (such as __address_space__, __vector_size__, etc) apply to the
8067 // type, but others can be present in the type specifiers even though they
8068 // apply to the decl. Here we apply type attributes and ignore the rest.
8069
8070 // This loop modifies the list pretty frequently, but we still need to make
8071 // sure we visit every element once. Copy the attributes list, and iterate
8072 // over that.
8073 ParsedAttributesView AttrsCopy{attrs};
8074
8075 state.setParsedNoDeref(false);
8076
8077 for (ParsedAttr &attr : AttrsCopy) {
8078
8079 // Skip attributes that were marked to be invalid.
8080 if (attr.isInvalid())
8081 continue;
8082
8083 if (attr.isStandardAttributeSyntax()) {
8084 // [[gnu::...]] attributes are treated as declaration attributes, so may
8085 // not appertain to a DeclaratorChunk. If we handle them as type
8086 // attributes, accept them in that position and diagnose the GCC
8087 // incompatibility.
8088 if (attr.isGNUScope()) {
8089 bool IsTypeAttr = attr.isTypeAttr();
8090 if (TAL == TAL_DeclChunk) {
8091 state.getSema().Diag(attr.getLoc(),
8092 IsTypeAttr
8093 ? diag::warn_gcc_ignores_type_attr
8094 : diag::warn_cxx11_gnu_attribute_on_type)
8095 << attr;
8096 if (!IsTypeAttr)
8097 continue;
8098 }
8099 } else if (TAL != TAL_DeclChunk && !isAddressSpaceKind(attr)) {
8100 // Otherwise, only consider type processing for a C++11 attribute if
8101 // it's actually been applied to a type.
8102 // We also allow C++11 address_space and
8103 // OpenCL language address space attributes to pass through.
8104 continue;
8105 }
8106 }
8107
8108 // If this is an attribute we can handle, do so now,
8109 // otherwise, add it to the FnAttrs list for rechaining.
8110 switch (attr.getKind()) {
8111 default:
8112 // A [[]] attribute on a declarator chunk must appertain to a type.
8113 if (attr.isStandardAttributeSyntax() && TAL == TAL_DeclChunk) {
8114 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
8115 << attr;
8116 attr.setUsedAsTypeAttr();
8117 }
8118 break;
8119
8120 case ParsedAttr::UnknownAttribute:
8121 if (attr.isStandardAttributeSyntax() && TAL == TAL_DeclChunk)
8122 state.getSema().Diag(attr.getLoc(),
8123 diag::warn_unknown_attribute_ignored)
8124 << attr << attr.getRange();
8125 break;
8126
8127 case ParsedAttr::IgnoredAttribute:
8128 break;
8129
8130 case ParsedAttr::AT_MayAlias:
8131 // FIXME: This attribute needs to actually be handled, but if we ignore
8132 // it it breaks large amounts of Linux software.
8133 attr.setUsedAsTypeAttr();
8134 break;
8135 case ParsedAttr::AT_OpenCLPrivateAddressSpace:
8136 case ParsedAttr::AT_OpenCLGlobalAddressSpace:
8137 case ParsedAttr::AT_OpenCLGlobalDeviceAddressSpace:
8138 case ParsedAttr::AT_OpenCLGlobalHostAddressSpace:
8139 case ParsedAttr::AT_OpenCLLocalAddressSpace:
8140 case ParsedAttr::AT_OpenCLConstantAddressSpace:
8141 case ParsedAttr::AT_OpenCLGenericAddressSpace:
8142 case ParsedAttr::AT_AddressSpace:
8143 HandleAddressSpaceTypeAttribute(type, attr, state);
8144 attr.setUsedAsTypeAttr();
8145 break;
8146 OBJC_POINTER_TYPE_ATTRS_CASELIST:
8147 if (!handleObjCPointerTypeAttr(state, attr, type))
8148 distributeObjCPointerTypeAttr(state, attr, type);
8149 attr.setUsedAsTypeAttr();
8150 break;
8151 case ParsedAttr::AT_VectorSize:
8152 HandleVectorSizeAttr(type, attr, state.getSema());
8153 attr.setUsedAsTypeAttr();
8154 break;
8155 case ParsedAttr::AT_ExtVectorType:
8156 HandleExtVectorTypeAttr(type, attr, state.getSema());
8157 attr.setUsedAsTypeAttr();
8158 break;
8159 case ParsedAttr::AT_NeonVectorType:
8160 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
8161 VectorType::NeonVector);
8162 attr.setUsedAsTypeAttr();
8163 break;
8164 case ParsedAttr::AT_NeonPolyVectorType:
8165 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
8166 VectorType::NeonPolyVector);
8167 attr.setUsedAsTypeAttr();
8168 break;
8169 case ParsedAttr::AT_ArmSveVectorBits:
8170 HandleArmSveVectorBitsTypeAttr(type, attr, state.getSema());
8171 attr.setUsedAsTypeAttr();
8172 break;
8173 case ParsedAttr::AT_ArmMveStrictPolymorphism: {
8174 HandleArmMveStrictPolymorphismAttr(state, type, attr);
8175 attr.setUsedAsTypeAttr();
8176 break;
8177 }
8178 case ParsedAttr::AT_OpenCLAccess:
8179 HandleOpenCLAccessAttr(type, attr, state.getSema());
8180 attr.setUsedAsTypeAttr();
8181 break;
8182 case ParsedAttr::AT_LifetimeBound:
8183 if (TAL == TAL_DeclChunk)
8184 HandleLifetimeBoundAttr(state, type, attr);
8185 break;
8186
8187 case ParsedAttr::AT_NoDeref: {
8188 ASTContext &Ctx = state.getSema().Context;
8189 type = state.getAttributedType(createSimpleAttr<NoDerefAttr>(Ctx, attr),
8190 type, type);
8191 attr.setUsedAsTypeAttr();
8192 state.setParsedNoDeref(true);
8193 break;
8194 }
8195
8196 case ParsedAttr::AT_MatrixType:
8197 HandleMatrixTypeAttr(type, attr, state.getSema());
8198 attr.setUsedAsTypeAttr();
8199 break;
8200
8201 MS_TYPE_ATTRS_CASELIST:
8202 if (!handleMSPointerTypeQualifierAttr(state, attr, type))
8203 attr.setUsedAsTypeAttr();
8204 break;
8205
8206
8207 NULLABILITY_TYPE_ATTRS_CASELIST:
8208 // Either add nullability here or try to distribute it. We
8209 // don't want to distribute the nullability specifier past any
8210 // dependent type, because that complicates the user model.
8211 if (type->canHaveNullability() || type->isDependentType() ||
8212 type->isArrayType() ||
8213 !distributeNullabilityTypeAttr(state, type, attr)) {
8214 unsigned endIndex;
8215 if (TAL == TAL_DeclChunk)
8216 endIndex = state.getCurrentChunkIndex();
8217 else
8218 endIndex = state.getDeclarator().getNumTypeObjects();
8219 bool allowOnArrayType =
8220 state.getDeclarator().isPrototypeContext() &&
8221 !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex);
8222 if (checkNullabilityTypeSpecifier(
8223 state,
8224 type,
8225 attr,
8226 allowOnArrayType)) {
8227 attr.setInvalid();
8228 }
8229
8230 attr.setUsedAsTypeAttr();
8231 }
8232 break;
8233
8234 case ParsedAttr::AT_ObjCKindOf:
8235 // '__kindof' must be part of the decl-specifiers.
8236 switch (TAL) {
8237 case TAL_DeclSpec:
8238 break;
8239
8240 case TAL_DeclChunk:
8241 case TAL_DeclName:
8242 state.getSema().Diag(attr.getLoc(),
8243 diag::err_objc_kindof_wrong_position)
8244 << FixItHint::CreateRemoval(attr.getLoc())
8245 << FixItHint::CreateInsertion(
8246 state.getDeclarator().getDeclSpec().getBeginLoc(),
8247 "__kindof ");
8248 break;
8249 }
8250
8251 // Apply it regardless.
8252 if (checkObjCKindOfType(state, type, attr))
8253 attr.setInvalid();
8254 break;
8255
8256 case ParsedAttr::AT_NoThrow:
8257 // Exception Specifications aren't generally supported in C mode throughout
8258 // clang, so revert to attribute-based handling for C.
8259 if (!state.getSema().getLangOpts().CPlusPlus)
8260 break;
8261 LLVM_FALLTHROUGH;
8262 FUNCTION_TYPE_ATTRS_CASELIST:
8263 attr.setUsedAsTypeAttr();
8264
8265 // Never process function type attributes as part of the
8266 // declaration-specifiers.
8267 if (TAL == TAL_DeclSpec)
8268 distributeFunctionTypeAttrFromDeclSpec(state, attr, type);
8269
8270 // Otherwise, handle the possible delays.
8271 else if (!handleFunctionTypeAttr(state, attr, type))
8272 distributeFunctionTypeAttr(state, attr, type);
8273 break;
8274 case ParsedAttr::AT_AcquireHandle: {
8275 if (!type->isFunctionType())
8276 return;
8277
8278 if (attr.getNumArgs() != 1) {
8279 state.getSema().Diag(attr.getLoc(),
8280 diag::err_attribute_wrong_number_arguments)
8281 << attr << 1;
8282 attr.setInvalid();
8283 return;
8284 }
8285
8286 StringRef HandleType;
8287 if (!state.getSema().checkStringLiteralArgumentAttr(attr, 0, HandleType))
8288 return;
8289 type = state.getAttributedType(
8290 AcquireHandleAttr::Create(state.getSema().Context, HandleType, attr),
8291 type, type);
8292 attr.setUsedAsTypeAttr();
8293 break;
8294 }
8295 }
8296
8297 // Handle attributes that are defined in a macro. We do not want this to be
8298 // applied to ObjC builtin attributes.
8299 if (isa<AttributedType>(type) && attr.hasMacroIdentifier() &&
8300 !type.getQualifiers().hasObjCLifetime() &&
8301 !type.getQualifiers().hasObjCGCAttr() &&
8302 attr.getKind() != ParsedAttr::AT_ObjCGC &&
8303 attr.getKind() != ParsedAttr::AT_ObjCOwnership) {
8304 const IdentifierInfo *MacroII = attr.getMacroIdentifier();
8305 type = state.getSema().Context.getMacroQualifiedType(type, MacroII);
8306 state.setExpansionLocForMacroQualifiedType(
8307 cast<MacroQualifiedType>(type.getTypePtr()),
8308 attr.getMacroExpansionLoc());
8309 }
8310 }
8311 }
8312
completeExprArrayBound(Expr * E)8313 void Sema::completeExprArrayBound(Expr *E) {
8314 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
8315 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
8316 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
8317 auto *Def = Var->getDefinition();
8318 if (!Def) {
8319 SourceLocation PointOfInstantiation = E->getExprLoc();
8320 runWithSufficientStackSpace(PointOfInstantiation, [&] {
8321 InstantiateVariableDefinition(PointOfInstantiation, Var);
8322 });
8323 Def = Var->getDefinition();
8324
8325 // If we don't already have a point of instantiation, and we managed
8326 // to instantiate a definition, this is the point of instantiation.
8327 // Otherwise, we don't request an end-of-TU instantiation, so this is
8328 // not a point of instantiation.
8329 // FIXME: Is this really the right behavior?
8330 if (Var->getPointOfInstantiation().isInvalid() && Def) {
8331 assert(Var->getTemplateSpecializationKind() ==
8332 TSK_ImplicitInstantiation &&
8333 "explicit instantiation with no point of instantiation");
8334 Var->setTemplateSpecializationKind(
8335 Var->getTemplateSpecializationKind(), PointOfInstantiation);
8336 }
8337 }
8338
8339 // Update the type to the definition's type both here and within the
8340 // expression.
8341 if (Def) {
8342 DRE->setDecl(Def);
8343 QualType T = Def->getType();
8344 DRE->setType(T);
8345 // FIXME: Update the type on all intervening expressions.
8346 E->setType(T);
8347 }
8348
8349 // We still go on to try to complete the type independently, as it
8350 // may also require instantiations or diagnostics if it remains
8351 // incomplete.
8352 }
8353 }
8354 }
8355 }
8356
getCompletedType(Expr * E)8357 QualType Sema::getCompletedType(Expr *E) {
8358 // Incomplete array types may be completed by the initializer attached to
8359 // their definitions. For static data members of class templates and for
8360 // variable templates, we need to instantiate the definition to get this
8361 // initializer and complete the type.
8362 if (E->getType()->isIncompleteArrayType())
8363 completeExprArrayBound(E);
8364
8365 // FIXME: Are there other cases which require instantiating something other
8366 // than the type to complete the type of an expression?
8367
8368 return E->getType();
8369 }
8370
8371 /// Ensure that the type of the given expression is complete.
8372 ///
8373 /// This routine checks whether the expression \p E has a complete type. If the
8374 /// expression refers to an instantiable construct, that instantiation is
8375 /// performed as needed to complete its type. Furthermore
8376 /// Sema::RequireCompleteType is called for the expression's type (or in the
8377 /// case of a reference type, the referred-to type).
8378 ///
8379 /// \param E The expression whose type is required to be complete.
8380 /// \param Kind Selects which completeness rules should be applied.
8381 /// \param Diagnoser The object that will emit a diagnostic if the type is
8382 /// incomplete.
8383 ///
8384 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
8385 /// otherwise.
RequireCompleteExprType(Expr * E,CompleteTypeKind Kind,TypeDiagnoser & Diagnoser)8386 bool Sema::RequireCompleteExprType(Expr *E, CompleteTypeKind Kind,
8387 TypeDiagnoser &Diagnoser) {
8388 return RequireCompleteType(E->getExprLoc(), getCompletedType(E), Kind,
8389 Diagnoser);
8390 }
8391
RequireCompleteExprType(Expr * E,unsigned DiagID)8392 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
8393 BoundTypeDiagnoser<> Diagnoser(DiagID);
8394 return RequireCompleteExprType(E, CompleteTypeKind::Default, Diagnoser);
8395 }
8396
8397 /// Ensure that the type T is a complete type.
8398 ///
8399 /// This routine checks whether the type @p T is complete in any
8400 /// context where a complete type is required. If @p T is a complete
8401 /// type, returns false. If @p T is a class template specialization,
8402 /// this routine then attempts to perform class template
8403 /// instantiation. If instantiation fails, or if @p T is incomplete
8404 /// and cannot be completed, issues the diagnostic @p diag (giving it
8405 /// the type @p T) and returns true.
8406 ///
8407 /// @param Loc The location in the source that the incomplete type
8408 /// diagnostic should refer to.
8409 ///
8410 /// @param T The type that this routine is examining for completeness.
8411 ///
8412 /// @param Kind Selects which completeness rules should be applied.
8413 ///
8414 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
8415 /// @c false otherwise.
RequireCompleteType(SourceLocation Loc,QualType T,CompleteTypeKind Kind,TypeDiagnoser & Diagnoser)8416 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
8417 CompleteTypeKind Kind,
8418 TypeDiagnoser &Diagnoser) {
8419 if (RequireCompleteTypeImpl(Loc, T, Kind, &Diagnoser))
8420 return true;
8421 if (const TagType *Tag = T->getAs<TagType>()) {
8422 if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
8423 Tag->getDecl()->setCompleteDefinitionRequired();
8424 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
8425 }
8426 }
8427 return false;
8428 }
8429
hasStructuralCompatLayout(Decl * D,Decl * Suggested)8430 bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
8431 llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
8432 if (!Suggested)
8433 return false;
8434
8435 // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
8436 // and isolate from other C++ specific checks.
8437 StructuralEquivalenceContext Ctx(
8438 D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
8439 StructuralEquivalenceKind::Default,
8440 false /*StrictTypeSpelling*/, true /*Complain*/,
8441 true /*ErrorOnTagTypeMismatch*/);
8442 return Ctx.IsEquivalent(D, Suggested);
8443 }
8444
8445 /// Determine whether there is any declaration of \p D that was ever a
8446 /// definition (perhaps before module merging) and is currently visible.
8447 /// \param D The definition of the entity.
8448 /// \param Suggested Filled in with the declaration that should be made visible
8449 /// in order to provide a definition of this entity.
8450 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
8451 /// not defined. This only matters for enums with a fixed underlying
8452 /// type, since in all other cases, a type is complete if and only if it
8453 /// is defined.
hasVisibleDefinition(NamedDecl * D,NamedDecl ** Suggested,bool OnlyNeedComplete)8454 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
8455 bool OnlyNeedComplete) {
8456 // Easy case: if we don't have modules, all declarations are visible.
8457 if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility)
8458 return true;
8459
8460 // If this definition was instantiated from a template, map back to the
8461 // pattern from which it was instantiated.
8462 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
8463 // We're in the middle of defining it; this definition should be treated
8464 // as visible.
8465 return true;
8466 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
8467 if (auto *Pattern = RD->getTemplateInstantiationPattern())
8468 RD = Pattern;
8469 D = RD->getDefinition();
8470 } else if (auto *ED = dyn_cast<EnumDecl>(D)) {
8471 if (auto *Pattern = ED->getTemplateInstantiationPattern())
8472 ED = Pattern;
8473 if (OnlyNeedComplete && (ED->isFixed() || getLangOpts().MSVCCompat)) {
8474 // If the enum has a fixed underlying type, it may have been forward
8475 // declared. In -fms-compatibility, `enum Foo;` will also forward declare
8476 // the enum and assign it the underlying type of `int`. Since we're only
8477 // looking for a complete type (not a definition), any visible declaration
8478 // of it will do.
8479 *Suggested = nullptr;
8480 for (auto *Redecl : ED->redecls()) {
8481 if (isVisible(Redecl))
8482 return true;
8483 if (Redecl->isThisDeclarationADefinition() ||
8484 (Redecl->isCanonicalDecl() && !*Suggested))
8485 *Suggested = Redecl;
8486 }
8487 return false;
8488 }
8489 D = ED->getDefinition();
8490 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
8491 if (auto *Pattern = FD->getTemplateInstantiationPattern())
8492 FD = Pattern;
8493 D = FD->getDefinition();
8494 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
8495 if (auto *Pattern = VD->getTemplateInstantiationPattern())
8496 VD = Pattern;
8497 D = VD->getDefinition();
8498 }
8499 assert(D && "missing definition for pattern of instantiated definition");
8500
8501 *Suggested = D;
8502
8503 auto DefinitionIsVisible = [&] {
8504 // The (primary) definition might be in a visible module.
8505 if (isVisible(D))
8506 return true;
8507
8508 // A visible module might have a merged definition instead.
8509 if (D->isModulePrivate() ? hasMergedDefinitionInCurrentModule(D)
8510 : hasVisibleMergedDefinition(D)) {
8511 if (CodeSynthesisContexts.empty() &&
8512 !getLangOpts().ModulesLocalVisibility) {
8513 // Cache the fact that this definition is implicitly visible because
8514 // there is a visible merged definition.
8515 D->setVisibleDespiteOwningModule();
8516 }
8517 return true;
8518 }
8519
8520 return false;
8521 };
8522
8523 if (DefinitionIsVisible())
8524 return true;
8525
8526 // The external source may have additional definitions of this entity that are
8527 // visible, so complete the redeclaration chain now and ask again.
8528 if (auto *Source = Context.getExternalSource()) {
8529 Source->CompleteRedeclChain(D);
8530 return DefinitionIsVisible();
8531 }
8532
8533 return false;
8534 }
8535
8536 /// Locks in the inheritance model for the given class and all of its bases.
assignInheritanceModel(Sema & S,CXXRecordDecl * RD)8537 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
8538 RD = RD->getMostRecentNonInjectedDecl();
8539 if (!RD->hasAttr<MSInheritanceAttr>()) {
8540 MSInheritanceModel IM;
8541 bool BestCase = false;
8542 switch (S.MSPointerToMemberRepresentationMethod) {
8543 case LangOptions::PPTMK_BestCase:
8544 BestCase = true;
8545 IM = RD->calculateInheritanceModel();
8546 break;
8547 case LangOptions::PPTMK_FullGeneralitySingleInheritance:
8548 IM = MSInheritanceModel::Single;
8549 break;
8550 case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
8551 IM = MSInheritanceModel::Multiple;
8552 break;
8553 case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
8554 IM = MSInheritanceModel::Unspecified;
8555 break;
8556 }
8557
8558 SourceRange Loc = S.ImplicitMSInheritanceAttrLoc.isValid()
8559 ? S.ImplicitMSInheritanceAttrLoc
8560 : RD->getSourceRange();
8561 RD->addAttr(MSInheritanceAttr::CreateImplicit(
8562 S.getASTContext(), BestCase, Loc, AttributeCommonInfo::AS_Microsoft,
8563 MSInheritanceAttr::Spelling(IM)));
8564 S.Consumer.AssignInheritanceModel(RD);
8565 }
8566 }
8567
8568 /// The implementation of RequireCompleteType
RequireCompleteTypeImpl(SourceLocation Loc,QualType T,CompleteTypeKind Kind,TypeDiagnoser * Diagnoser)8569 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
8570 CompleteTypeKind Kind,
8571 TypeDiagnoser *Diagnoser) {
8572 // FIXME: Add this assertion to make sure we always get instantiation points.
8573 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
8574 // FIXME: Add this assertion to help us flush out problems with
8575 // checking for dependent types and type-dependent expressions.
8576 //
8577 // assert(!T->isDependentType() &&
8578 // "Can't ask whether a dependent type is complete");
8579
8580 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
8581 if (!MPTy->getClass()->isDependentType()) {
8582 if (getLangOpts().CompleteMemberPointers &&
8583 !MPTy->getClass()->getAsCXXRecordDecl()->isBeingDefined() &&
8584 RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), Kind,
8585 diag::err_memptr_incomplete))
8586 return true;
8587
8588 // We lock in the inheritance model once somebody has asked us to ensure
8589 // that a pointer-to-member type is complete.
8590 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
8591 (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0));
8592 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
8593 }
8594 }
8595 }
8596
8597 NamedDecl *Def = nullptr;
8598 bool AcceptSizeless = (Kind == CompleteTypeKind::AcceptSizeless);
8599 bool Incomplete = (T->isIncompleteType(&Def) ||
8600 (!AcceptSizeless && T->isSizelessBuiltinType()));
8601
8602 // Check that any necessary explicit specializations are visible. For an
8603 // enum, we just need the declaration, so don't check this.
8604 if (Def && !isa<EnumDecl>(Def))
8605 checkSpecializationVisibility(Loc, Def);
8606
8607 // If we have a complete type, we're done.
8608 if (!Incomplete) {
8609 // If we know about the definition but it is not visible, complain.
8610 NamedDecl *SuggestedDef = nullptr;
8611 if (Def &&
8612 !hasVisibleDefinition(Def, &SuggestedDef, /*OnlyNeedComplete*/true)) {
8613 // If the user is going to see an error here, recover by making the
8614 // definition visible.
8615 bool TreatAsComplete = Diagnoser && !isSFINAEContext();
8616 if (Diagnoser && SuggestedDef)
8617 diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition,
8618 /*Recover*/TreatAsComplete);
8619 return !TreatAsComplete;
8620 } else if (Def && !TemplateInstCallbacks.empty()) {
8621 CodeSynthesisContext TempInst;
8622 TempInst.Kind = CodeSynthesisContext::Memoization;
8623 TempInst.Template = Def;
8624 TempInst.Entity = Def;
8625 TempInst.PointOfInstantiation = Loc;
8626 atTemplateBegin(TemplateInstCallbacks, *this, TempInst);
8627 atTemplateEnd(TemplateInstCallbacks, *this, TempInst);
8628 }
8629
8630 return false;
8631 }
8632
8633 TagDecl *Tag = dyn_cast_or_null<TagDecl>(Def);
8634 ObjCInterfaceDecl *IFace = dyn_cast_or_null<ObjCInterfaceDecl>(Def);
8635
8636 // Give the external source a chance to provide a definition of the type.
8637 // This is kept separate from completing the redeclaration chain so that
8638 // external sources such as LLDB can avoid synthesizing a type definition
8639 // unless it's actually needed.
8640 if (Tag || IFace) {
8641 // Avoid diagnosing invalid decls as incomplete.
8642 if (Def->isInvalidDecl())
8643 return true;
8644
8645 // Give the external AST source a chance to complete the type.
8646 if (auto *Source = Context.getExternalSource()) {
8647 if (Tag && Tag->hasExternalLexicalStorage())
8648 Source->CompleteType(Tag);
8649 if (IFace && IFace->hasExternalLexicalStorage())
8650 Source->CompleteType(IFace);
8651 // If the external source completed the type, go through the motions
8652 // again to ensure we're allowed to use the completed type.
8653 if (!T->isIncompleteType())
8654 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
8655 }
8656 }
8657
8658 // If we have a class template specialization or a class member of a
8659 // class template specialization, or an array with known size of such,
8660 // try to instantiate it.
8661 if (auto *RD = dyn_cast_or_null<CXXRecordDecl>(Tag)) {
8662 bool Instantiated = false;
8663 bool Diagnosed = false;
8664 if (RD->isDependentContext()) {
8665 // Don't try to instantiate a dependent class (eg, a member template of
8666 // an instantiated class template specialization).
8667 // FIXME: Can this ever happen?
8668 } else if (auto *ClassTemplateSpec =
8669 dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
8670 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
8671 runWithSufficientStackSpace(Loc, [&] {
8672 Diagnosed = InstantiateClassTemplateSpecialization(
8673 Loc, ClassTemplateSpec, TSK_ImplicitInstantiation,
8674 /*Complain=*/Diagnoser);
8675 });
8676 Instantiated = true;
8677 }
8678 } else {
8679 CXXRecordDecl *Pattern = RD->getInstantiatedFromMemberClass();
8680 if (!RD->isBeingDefined() && Pattern) {
8681 MemberSpecializationInfo *MSI = RD->getMemberSpecializationInfo();
8682 assert(MSI && "Missing member specialization information?");
8683 // This record was instantiated from a class within a template.
8684 if (MSI->getTemplateSpecializationKind() !=
8685 TSK_ExplicitSpecialization) {
8686 runWithSufficientStackSpace(Loc, [&] {
8687 Diagnosed = InstantiateClass(Loc, RD, Pattern,
8688 getTemplateInstantiationArgs(RD),
8689 TSK_ImplicitInstantiation,
8690 /*Complain=*/Diagnoser);
8691 });
8692 Instantiated = true;
8693 }
8694 }
8695 }
8696
8697 if (Instantiated) {
8698 // Instantiate* might have already complained that the template is not
8699 // defined, if we asked it to.
8700 if (Diagnoser && Diagnosed)
8701 return true;
8702 // If we instantiated a definition, check that it's usable, even if
8703 // instantiation produced an error, so that repeated calls to this
8704 // function give consistent answers.
8705 if (!T->isIncompleteType())
8706 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
8707 }
8708 }
8709
8710 // FIXME: If we didn't instantiate a definition because of an explicit
8711 // specialization declaration, check that it's visible.
8712
8713 if (!Diagnoser)
8714 return true;
8715
8716 Diagnoser->diagnose(*this, Loc, T);
8717
8718 // If the type was a forward declaration of a class/struct/union
8719 // type, produce a note.
8720 if (Tag && !Tag->isInvalidDecl() && !Tag->getLocation().isInvalid())
8721 Diag(Tag->getLocation(),
8722 Tag->isBeingDefined() ? diag::note_type_being_defined
8723 : diag::note_forward_declaration)
8724 << Context.getTagDeclType(Tag);
8725
8726 // If the Objective-C class was a forward declaration, produce a note.
8727 if (IFace && !IFace->isInvalidDecl() && !IFace->getLocation().isInvalid())
8728 Diag(IFace->getLocation(), diag::note_forward_class);
8729
8730 // If we have external information that we can use to suggest a fix,
8731 // produce a note.
8732 if (ExternalSource)
8733 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);
8734
8735 return true;
8736 }
8737
RequireCompleteType(SourceLocation Loc,QualType T,CompleteTypeKind Kind,unsigned DiagID)8738 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
8739 CompleteTypeKind Kind, unsigned DiagID) {
8740 BoundTypeDiagnoser<> Diagnoser(DiagID);
8741 return RequireCompleteType(Loc, T, Kind, Diagnoser);
8742 }
8743
8744 /// Get diagnostic %select index for tag kind for
8745 /// literal type diagnostic message.
8746 /// WARNING: Indexes apply to particular diagnostics only!
8747 ///
8748 /// \returns diagnostic %select index.
getLiteralDiagFromTagKind(TagTypeKind Tag)8749 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
8750 switch (Tag) {
8751 case TTK_Struct: return 0;
8752 case TTK_Interface: return 1;
8753 case TTK_Class: return 2;
8754 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!");
8755 }
8756 }
8757
8758 /// Ensure that the type T is a literal type.
8759 ///
8760 /// This routine checks whether the type @p T is a literal type. If @p T is an
8761 /// incomplete type, an attempt is made to complete it. If @p T is a literal
8762 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
8763 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
8764 /// it the type @p T), along with notes explaining why the type is not a
8765 /// literal type, and returns true.
8766 ///
8767 /// @param Loc The location in the source that the non-literal type
8768 /// diagnostic should refer to.
8769 ///
8770 /// @param T The type that this routine is examining for literalness.
8771 ///
8772 /// @param Diagnoser Emits a diagnostic if T is not a literal type.
8773 ///
8774 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
8775 /// @c false otherwise.
RequireLiteralType(SourceLocation Loc,QualType T,TypeDiagnoser & Diagnoser)8776 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
8777 TypeDiagnoser &Diagnoser) {
8778 assert(!T->isDependentType() && "type should not be dependent");
8779
8780 QualType ElemType = Context.getBaseElementType(T);
8781 if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) &&
8782 T->isLiteralType(Context))
8783 return false;
8784
8785 Diagnoser.diagnose(*this, Loc, T);
8786
8787 if (T->isVariableArrayType())
8788 return true;
8789
8790 const RecordType *RT = ElemType->getAs<RecordType>();
8791 if (!RT)
8792 return true;
8793
8794 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
8795
8796 // A partially-defined class type can't be a literal type, because a literal
8797 // class type must have a trivial destructor (which can't be checked until
8798 // the class definition is complete).
8799 if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T))
8800 return true;
8801
8802 // [expr.prim.lambda]p3:
8803 // This class type is [not] a literal type.
8804 if (RD->isLambda() && !getLangOpts().CPlusPlus17) {
8805 Diag(RD->getLocation(), diag::note_non_literal_lambda);
8806 return true;
8807 }
8808
8809 // If the class has virtual base classes, then it's not an aggregate, and
8810 // cannot have any constexpr constructors or a trivial default constructor,
8811 // so is non-literal. This is better to diagnose than the resulting absence
8812 // of constexpr constructors.
8813 if (RD->getNumVBases()) {
8814 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
8815 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
8816 for (const auto &I : RD->vbases())
8817 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
8818 << I.getSourceRange();
8819 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
8820 !RD->hasTrivialDefaultConstructor()) {
8821 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
8822 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
8823 for (const auto &I : RD->bases()) {
8824 if (!I.getType()->isLiteralType(Context)) {
8825 Diag(I.getBeginLoc(), diag::note_non_literal_base_class)
8826 << RD << I.getType() << I.getSourceRange();
8827 return true;
8828 }
8829 }
8830 for (const auto *I : RD->fields()) {
8831 if (!I->getType()->isLiteralType(Context) ||
8832 I->getType().isVolatileQualified()) {
8833 Diag(I->getLocation(), diag::note_non_literal_field)
8834 << RD << I << I->getType()
8835 << I->getType().isVolatileQualified();
8836 return true;
8837 }
8838 }
8839 } else if (getLangOpts().CPlusPlus20 ? !RD->hasConstexprDestructor()
8840 : !RD->hasTrivialDestructor()) {
8841 // All fields and bases are of literal types, so have trivial or constexpr
8842 // destructors. If this class's destructor is non-trivial / non-constexpr,
8843 // it must be user-declared.
8844 CXXDestructorDecl *Dtor = RD->getDestructor();
8845 assert(Dtor && "class has literal fields and bases but no dtor?");
8846 if (!Dtor)
8847 return true;
8848
8849 if (getLangOpts().CPlusPlus20) {
8850 Diag(Dtor->getLocation(), diag::note_non_literal_non_constexpr_dtor)
8851 << RD;
8852 } else {
8853 Diag(Dtor->getLocation(), Dtor->isUserProvided()
8854 ? diag::note_non_literal_user_provided_dtor
8855 : diag::note_non_literal_nontrivial_dtor)
8856 << RD;
8857 if (!Dtor->isUserProvided())
8858 SpecialMemberIsTrivial(Dtor, CXXDestructor, TAH_IgnoreTrivialABI,
8859 /*Diagnose*/ true);
8860 }
8861 }
8862
8863 return true;
8864 }
8865
RequireLiteralType(SourceLocation Loc,QualType T,unsigned DiagID)8866 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
8867 BoundTypeDiagnoser<> Diagnoser(DiagID);
8868 return RequireLiteralType(Loc, T, Diagnoser);
8869 }
8870
8871 /// Retrieve a version of the type 'T' that is elaborated by Keyword, qualified
8872 /// by the nested-name-specifier contained in SS, and that is (re)declared by
8873 /// OwnedTagDecl, which is nullptr if this is not a (re)declaration.
getElaboratedType(ElaboratedTypeKeyword Keyword,const CXXScopeSpec & SS,QualType T,TagDecl * OwnedTagDecl)8874 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
8875 const CXXScopeSpec &SS, QualType T,
8876 TagDecl *OwnedTagDecl) {
8877 if (T.isNull())
8878 return T;
8879 NestedNameSpecifier *NNS;
8880 if (SS.isValid())
8881 NNS = SS.getScopeRep();
8882 else {
8883 if (Keyword == ETK_None)
8884 return T;
8885 NNS = nullptr;
8886 }
8887 return Context.getElaboratedType(Keyword, NNS, T, OwnedTagDecl);
8888 }
8889
BuildTypeofExprType(Expr * E,SourceLocation Loc)8890 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) {
8891 assert(!E->hasPlaceholderType() && "unexpected placeholder");
8892
8893 if (!getLangOpts().CPlusPlus && E->refersToBitField())
8894 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2;
8895
8896 if (!E->isTypeDependent()) {
8897 QualType T = E->getType();
8898 if (const TagType *TT = T->getAs<TagType>())
8899 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
8900 }
8901 return Context.getTypeOfExprType(E);
8902 }
8903
8904 /// getDecltypeForExpr - Given an expr, will return the decltype for
8905 /// that expression, according to the rules in C++11
8906 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
getDecltypeForExpr(Sema & S,Expr * E)8907 static QualType getDecltypeForExpr(Sema &S, Expr *E) {
8908 if (E->isTypeDependent())
8909 return S.Context.DependentTy;
8910
8911 Expr *IDExpr = E;
8912 if (auto *ImplCastExpr = dyn_cast<ImplicitCastExpr>(E))
8913 IDExpr = ImplCastExpr->getSubExpr();
8914
8915 // C++11 [dcl.type.simple]p4:
8916 // The type denoted by decltype(e) is defined as follows:
8917
8918 // C++20:
8919 // - if E is an unparenthesized id-expression naming a non-type
8920 // template-parameter (13.2), decltype(E) is the type of the
8921 // template-parameter after performing any necessary type deduction
8922 // Note that this does not pick up the implicit 'const' for a template
8923 // parameter object. This rule makes no difference before C++20 so we apply
8924 // it unconditionally.
8925 if (const auto *SNTTPE = dyn_cast<SubstNonTypeTemplateParmExpr>(IDExpr))
8926 return SNTTPE->getParameterType(S.Context);
8927
8928 // - if e is an unparenthesized id-expression or an unparenthesized class
8929 // member access (5.2.5), decltype(e) is the type of the entity named
8930 // by e. If there is no such entity, or if e names a set of overloaded
8931 // functions, the program is ill-formed;
8932 //
8933 // We apply the same rules for Objective-C ivar and property references.
8934 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(IDExpr)) {
8935 const ValueDecl *VD = DRE->getDecl();
8936 if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(VD))
8937 return TPO->getType().getUnqualifiedType();
8938 return VD->getType();
8939 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(IDExpr)) {
8940 if (const ValueDecl *VD = ME->getMemberDecl())
8941 if (isa<FieldDecl>(VD) || isa<VarDecl>(VD))
8942 return VD->getType();
8943 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(IDExpr)) {
8944 return IR->getDecl()->getType();
8945 } else if (const ObjCPropertyRefExpr *PR =
8946 dyn_cast<ObjCPropertyRefExpr>(IDExpr)) {
8947 if (PR->isExplicitProperty())
8948 return PR->getExplicitProperty()->getType();
8949 } else if (auto *PE = dyn_cast<PredefinedExpr>(IDExpr)) {
8950 return PE->getType();
8951 }
8952
8953 // C++11 [expr.lambda.prim]p18:
8954 // Every occurrence of decltype((x)) where x is a possibly
8955 // parenthesized id-expression that names an entity of automatic
8956 // storage duration is treated as if x were transformed into an
8957 // access to a corresponding data member of the closure type that
8958 // would have been declared if x were an odr-use of the denoted
8959 // entity.
8960 using namespace sema;
8961 if (S.getCurLambda()) {
8962 if (isa<ParenExpr>(IDExpr)) {
8963 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(IDExpr->IgnoreParens())) {
8964 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
8965 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation());
8966 if (!T.isNull())
8967 return S.Context.getLValueReferenceType(T);
8968 }
8969 }
8970 }
8971 }
8972
8973 return S.Context.getReferenceQualifiedType(E);
8974 }
8975
BuildDecltypeType(Expr * E,SourceLocation Loc,bool AsUnevaluated)8976 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc,
8977 bool AsUnevaluated) {
8978 assert(!E->hasPlaceholderType() && "unexpected placeholder");
8979
8980 if (AsUnevaluated && CodeSynthesisContexts.empty() &&
8981 !E->isInstantiationDependent() && E->HasSideEffects(Context, false)) {
8982 // The expression operand for decltype is in an unevaluated expression
8983 // context, so side effects could result in unintended consequences.
8984 // Exclude instantiation-dependent expressions, because 'decltype' is often
8985 // used to build SFINAE gadgets.
8986 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
8987 }
8988
8989 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E));
8990 }
8991
BuildUnaryTransformType(QualType BaseType,UnaryTransformType::UTTKind UKind,SourceLocation Loc)8992 QualType Sema::BuildUnaryTransformType(QualType BaseType,
8993 UnaryTransformType::UTTKind UKind,
8994 SourceLocation Loc) {
8995 switch (UKind) {
8996 case UnaryTransformType::EnumUnderlyingType:
8997 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) {
8998 Diag(Loc, diag::err_only_enums_have_underlying_types);
8999 return QualType();
9000 } else {
9001 QualType Underlying = BaseType;
9002 if (!BaseType->isDependentType()) {
9003 // The enum could be incomplete if we're parsing its definition or
9004 // recovering from an error.
9005 NamedDecl *FwdDecl = nullptr;
9006 if (BaseType->isIncompleteType(&FwdDecl)) {
9007 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
9008 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
9009 return QualType();
9010 }
9011
9012 EnumDecl *ED = BaseType->castAs<EnumType>()->getDecl();
9013 assert(ED && "EnumType has no EnumDecl");
9014
9015 DiagnoseUseOfDecl(ED, Loc);
9016
9017 Underlying = ED->getIntegerType();
9018 assert(!Underlying.isNull());
9019 }
9020 return Context.getUnaryTransformType(BaseType, Underlying,
9021 UnaryTransformType::EnumUnderlyingType);
9022 }
9023 }
9024 llvm_unreachable("unknown unary transform type");
9025 }
9026
BuildAtomicType(QualType T,SourceLocation Loc)9027 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
9028 if (!T->isDependentType()) {
9029 // FIXME: It isn't entirely clear whether incomplete atomic types
9030 // are allowed or not; for simplicity, ban them for the moment.
9031 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
9032 return QualType();
9033
9034 int DisallowedKind = -1;
9035 if (T->isArrayType())
9036 DisallowedKind = 1;
9037 else if (T->isFunctionType())
9038 DisallowedKind = 2;
9039 else if (T->isReferenceType())
9040 DisallowedKind = 3;
9041 else if (T->isAtomicType())
9042 DisallowedKind = 4;
9043 else if (T.hasQualifiers())
9044 DisallowedKind = 5;
9045 else if (T->isSizelessType())
9046 DisallowedKind = 6;
9047 else if (!T.isTriviallyCopyableType(Context))
9048 // Some other non-trivially-copyable type (probably a C++ class)
9049 DisallowedKind = 7;
9050 else if (T->isExtIntType()) {
9051 DisallowedKind = 8;
9052 }
9053
9054 if (DisallowedKind != -1) {
9055 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
9056 return QualType();
9057 }
9058
9059 // FIXME: Do we need any handling for ARC here?
9060 }
9061
9062 // Build the pointer type.
9063 return Context.getAtomicType(T);
9064 }
9065