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/ScopeInfo.h" 31 #include "clang/Sema/SemaInternal.h" 32 #include "clang/Sema/Template.h" 33 #include "clang/Sema/TemplateInstCallback.h" 34 #include "llvm/ADT/SmallPtrSet.h" 35 #include "llvm/ADT/SmallString.h" 36 #include "llvm/ADT/StringSwitch.h" 37 #include "llvm/Support/ErrorHandling.h" 38 39 using namespace clang; 40 41 enum TypeDiagSelector { 42 TDS_Function, 43 TDS_Pointer, 44 TDS_ObjCObjOrBlock 45 }; 46 47 /// isOmittedBlockReturnType - Return true if this declarator is missing a 48 /// return type because this is a omitted return type on a block literal. 49 static bool isOmittedBlockReturnType(const Declarator &D) { 50 if (D.getContext() != DeclaratorContext::BlockLiteralContext || 51 D.getDeclSpec().hasTypeSpecifier()) 52 return false; 53 54 if (D.getNumTypeObjects() == 0) 55 return true; // ^{ ... } 56 57 if (D.getNumTypeObjects() == 1 && 58 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 59 return true; // ^(int X, float Y) { ... } 60 61 return false; 62 } 63 64 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which 65 /// doesn't apply to the given type. 66 static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr, 67 QualType type) { 68 TypeDiagSelector WhichType; 69 bool useExpansionLoc = true; 70 switch (attr.getKind()) { 71 case ParsedAttr::AT_ObjCGC: 72 WhichType = TDS_Pointer; 73 break; 74 case ParsedAttr::AT_ObjCOwnership: 75 WhichType = TDS_ObjCObjOrBlock; 76 break; 77 default: 78 // Assume everything else was a function attribute. 79 WhichType = TDS_Function; 80 useExpansionLoc = false; 81 break; 82 } 83 84 SourceLocation loc = attr.getLoc(); 85 StringRef name = attr.getName()->getName(); 86 87 // The GC attributes are usually written with macros; special-case them. 88 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident 89 : nullptr; 90 if (useExpansionLoc && loc.isMacroID() && II) { 91 if (II->isStr("strong")) { 92 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 93 } else if (II->isStr("weak")) { 94 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 95 } 96 } 97 98 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType 99 << type; 100 } 101 102 // objc_gc applies to Objective-C pointers or, otherwise, to the 103 // smallest available pointer type (i.e. 'void*' in 'void**'). 104 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 105 case ParsedAttr::AT_ObjCGC: \ 106 case ParsedAttr::AT_ObjCOwnership 107 108 // Calling convention attributes. 109 #define CALLING_CONV_ATTRS_CASELIST \ 110 case ParsedAttr::AT_CDecl: \ 111 case ParsedAttr::AT_FastCall: \ 112 case ParsedAttr::AT_StdCall: \ 113 case ParsedAttr::AT_ThisCall: \ 114 case ParsedAttr::AT_RegCall: \ 115 case ParsedAttr::AT_Pascal: \ 116 case ParsedAttr::AT_SwiftCall: \ 117 case ParsedAttr::AT_VectorCall: \ 118 case ParsedAttr::AT_AArch64VectorPcs: \ 119 case ParsedAttr::AT_MSABI: \ 120 case ParsedAttr::AT_SysVABI: \ 121 case ParsedAttr::AT_Pcs: \ 122 case ParsedAttr::AT_IntelOclBicc: \ 123 case ParsedAttr::AT_PreserveMost: \ 124 case ParsedAttr::AT_PreserveAll 125 126 // Function type attributes. 127 #define FUNCTION_TYPE_ATTRS_CASELIST \ 128 case ParsedAttr::AT_NSReturnsRetained: \ 129 case ParsedAttr::AT_NoReturn: \ 130 case ParsedAttr::AT_Regparm: \ 131 case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: \ 132 case ParsedAttr::AT_AnyX86NoCfCheck: \ 133 CALLING_CONV_ATTRS_CASELIST 134 135 // Microsoft-specific type qualifiers. 136 #define MS_TYPE_ATTRS_CASELIST \ 137 case ParsedAttr::AT_Ptr32: \ 138 case ParsedAttr::AT_Ptr64: \ 139 case ParsedAttr::AT_SPtr: \ 140 case ParsedAttr::AT_UPtr 141 142 // Nullability qualifiers. 143 #define NULLABILITY_TYPE_ATTRS_CASELIST \ 144 case ParsedAttr::AT_TypeNonNull: \ 145 case ParsedAttr::AT_TypeNullable: \ 146 case ParsedAttr::AT_TypeNullUnspecified 147 148 namespace { 149 /// An object which stores processing state for the entire 150 /// GetTypeForDeclarator process. 151 class TypeProcessingState { 152 Sema &sema; 153 154 /// The declarator being processed. 155 Declarator &declarator; 156 157 /// The index of the declarator chunk we're currently processing. 158 /// May be the total number of valid chunks, indicating the 159 /// DeclSpec. 160 unsigned chunkIndex; 161 162 /// Whether there are non-trivial modifications to the decl spec. 163 bool trivial; 164 165 /// Whether we saved the attributes in the decl spec. 166 bool hasSavedAttrs; 167 168 /// The original set of attributes on the DeclSpec. 169 SmallVector<ParsedAttr *, 2> savedAttrs; 170 171 /// A list of attributes to diagnose the uselessness of when the 172 /// processing is complete. 173 SmallVector<ParsedAttr *, 2> ignoredTypeAttrs; 174 175 /// Attributes corresponding to AttributedTypeLocs that we have not yet 176 /// populated. 177 // FIXME: The two-phase mechanism by which we construct Types and fill 178 // their TypeLocs makes it hard to correctly assign these. We keep the 179 // attributes in creation order as an attempt to make them line up 180 // properly. 181 using TypeAttrPair = std::pair<const AttributedType*, const Attr*>; 182 SmallVector<TypeAttrPair, 8> AttrsForTypes; 183 bool AttrsForTypesSorted = true; 184 185 /// MacroQualifiedTypes mapping to macro expansion locations that will be 186 /// stored in a MacroQualifiedTypeLoc. 187 llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros; 188 189 /// Flag to indicate we parsed a noderef attribute. This is used for 190 /// validating that noderef was used on a pointer or array. 191 bool parsedNoDeref; 192 193 public: 194 TypeProcessingState(Sema &sema, Declarator &declarator) 195 : sema(sema), declarator(declarator), 196 chunkIndex(declarator.getNumTypeObjects()), trivial(true), 197 hasSavedAttrs(false), parsedNoDeref(false) {} 198 199 Sema &getSema() const { 200 return sema; 201 } 202 203 Declarator &getDeclarator() const { 204 return declarator; 205 } 206 207 bool isProcessingDeclSpec() const { 208 return chunkIndex == declarator.getNumTypeObjects(); 209 } 210 211 unsigned getCurrentChunkIndex() const { 212 return chunkIndex; 213 } 214 215 void setCurrentChunkIndex(unsigned idx) { 216 assert(idx <= declarator.getNumTypeObjects()); 217 chunkIndex = idx; 218 } 219 220 ParsedAttributesView &getCurrentAttributes() const { 221 if (isProcessingDeclSpec()) 222 return getMutableDeclSpec().getAttributes(); 223 return declarator.getTypeObject(chunkIndex).getAttrs(); 224 } 225 226 /// Save the current set of attributes on the DeclSpec. 227 void saveDeclSpecAttrs() { 228 // Don't try to save them multiple times. 229 if (hasSavedAttrs) return; 230 231 DeclSpec &spec = getMutableDeclSpec(); 232 for (ParsedAttr &AL : spec.getAttributes()) 233 savedAttrs.push_back(&AL); 234 trivial &= savedAttrs.empty(); 235 hasSavedAttrs = true; 236 } 237 238 /// Record that we had nowhere to put the given type attribute. 239 /// We will diagnose such attributes later. 240 void addIgnoredTypeAttr(ParsedAttr &attr) { 241 ignoredTypeAttrs.push_back(&attr); 242 } 243 244 /// Diagnose all the ignored type attributes, given that the 245 /// declarator worked out to the given type. 246 void diagnoseIgnoredTypeAttrs(QualType type) const { 247 for (auto *Attr : ignoredTypeAttrs) 248 diagnoseBadTypeAttribute(getSema(), *Attr, type); 249 } 250 251 /// Get an attributed type for the given attribute, and remember the Attr 252 /// object so that we can attach it to the AttributedTypeLoc. 253 QualType getAttributedType(Attr *A, QualType ModifiedType, 254 QualType EquivType) { 255 QualType T = 256 sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType); 257 AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A}); 258 AttrsForTypesSorted = false; 259 return T; 260 } 261 262 /// Completely replace the \c auto in \p TypeWithAuto by 263 /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if 264 /// necessary. 265 QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) { 266 QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement); 267 if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) { 268 // Attributed type still should be an attributed type after replacement. 269 auto *NewAttrTy = cast<AttributedType>(T.getTypePtr()); 270 for (TypeAttrPair &A : AttrsForTypes) { 271 if (A.first == AttrTy) 272 A.first = NewAttrTy; 273 } 274 AttrsForTypesSorted = false; 275 } 276 return T; 277 } 278 279 /// Extract and remove the Attr* for a given attributed type. 280 const Attr *takeAttrForAttributedType(const AttributedType *AT) { 281 if (!AttrsForTypesSorted) { 282 llvm::stable_sort(AttrsForTypes, llvm::less_first()); 283 AttrsForTypesSorted = true; 284 } 285 286 // FIXME: This is quadratic if we have lots of reuses of the same 287 // attributed type. 288 for (auto It = std::partition_point( 289 AttrsForTypes.begin(), AttrsForTypes.end(), 290 [=](const TypeAttrPair &A) { return A.first < AT; }); 291 It != AttrsForTypes.end() && It->first == AT; ++It) { 292 if (It->second) { 293 const Attr *Result = It->second; 294 It->second = nullptr; 295 return Result; 296 } 297 } 298 299 llvm_unreachable("no Attr* for AttributedType*"); 300 } 301 302 SourceLocation 303 getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const { 304 auto FoundLoc = LocsForMacros.find(MQT); 305 assert(FoundLoc != LocsForMacros.end() && 306 "Unable to find macro expansion location for MacroQualifedType"); 307 return FoundLoc->second; 308 } 309 310 void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT, 311 SourceLocation Loc) { 312 LocsForMacros[MQT] = Loc; 313 } 314 315 void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; } 316 317 bool didParseNoDeref() const { return parsedNoDeref; } 318 319 ~TypeProcessingState() { 320 if (trivial) return; 321 322 restoreDeclSpecAttrs(); 323 } 324 325 private: 326 DeclSpec &getMutableDeclSpec() const { 327 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 328 } 329 330 void restoreDeclSpecAttrs() { 331 assert(hasSavedAttrs); 332 333 getMutableDeclSpec().getAttributes().clearListOnly(); 334 for (ParsedAttr *AL : savedAttrs) 335 getMutableDeclSpec().getAttributes().addAtEnd(AL); 336 } 337 }; 338 } // end anonymous namespace 339 340 static void moveAttrFromListToList(ParsedAttr &attr, 341 ParsedAttributesView &fromList, 342 ParsedAttributesView &toList) { 343 fromList.remove(&attr); 344 toList.addAtEnd(&attr); 345 } 346 347 /// The location of a type attribute. 348 enum TypeAttrLocation { 349 /// The attribute is in the decl-specifier-seq. 350 TAL_DeclSpec, 351 /// The attribute is part of a DeclaratorChunk. 352 TAL_DeclChunk, 353 /// The attribute is immediately after the declaration's name. 354 TAL_DeclName 355 }; 356 357 static void processTypeAttrs(TypeProcessingState &state, QualType &type, 358 TypeAttrLocation TAL, ParsedAttributesView &attrs); 359 360 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr, 361 QualType &type); 362 363 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state, 364 ParsedAttr &attr, QualType &type); 365 366 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr, 367 QualType &type); 368 369 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 370 ParsedAttr &attr, QualType &type); 371 372 static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 373 ParsedAttr &attr, QualType &type) { 374 if (attr.getKind() == ParsedAttr::AT_ObjCGC) 375 return handleObjCGCTypeAttr(state, attr, type); 376 assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership); 377 return handleObjCOwnershipTypeAttr(state, attr, type); 378 } 379 380 /// Given the index of a declarator chunk, check whether that chunk 381 /// directly specifies the return type of a function and, if so, find 382 /// an appropriate place for it. 383 /// 384 /// \param i - a notional index which the search will start 385 /// immediately inside 386 /// 387 /// \param onlyBlockPointers Whether we should only look into block 388 /// pointer types (vs. all pointer types). 389 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, 390 unsigned i, 391 bool onlyBlockPointers) { 392 assert(i <= declarator.getNumTypeObjects()); 393 394 DeclaratorChunk *result = nullptr; 395 396 // First, look inwards past parens for a function declarator. 397 for (; i != 0; --i) { 398 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); 399 switch (fnChunk.Kind) { 400 case DeclaratorChunk::Paren: 401 continue; 402 403 // If we find anything except a function, bail out. 404 case DeclaratorChunk::Pointer: 405 case DeclaratorChunk::BlockPointer: 406 case DeclaratorChunk::Array: 407 case DeclaratorChunk::Reference: 408 case DeclaratorChunk::MemberPointer: 409 case DeclaratorChunk::Pipe: 410 return result; 411 412 // If we do find a function declarator, scan inwards from that, 413 // looking for a (block-)pointer declarator. 414 case DeclaratorChunk::Function: 415 for (--i; i != 0; --i) { 416 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1); 417 switch (ptrChunk.Kind) { 418 case DeclaratorChunk::Paren: 419 case DeclaratorChunk::Array: 420 case DeclaratorChunk::Function: 421 case DeclaratorChunk::Reference: 422 case DeclaratorChunk::Pipe: 423 continue; 424 425 case DeclaratorChunk::MemberPointer: 426 case DeclaratorChunk::Pointer: 427 if (onlyBlockPointers) 428 continue; 429 430 LLVM_FALLTHROUGH; 431 432 case DeclaratorChunk::BlockPointer: 433 result = &ptrChunk; 434 goto continue_outer; 435 } 436 llvm_unreachable("bad declarator chunk kind"); 437 } 438 439 // If we run out of declarators doing that, we're done. 440 return result; 441 } 442 llvm_unreachable("bad declarator chunk kind"); 443 444 // Okay, reconsider from our new point. 445 continue_outer: ; 446 } 447 448 // Ran out of chunks, bail out. 449 return result; 450 } 451 452 /// Given that an objc_gc attribute was written somewhere on a 453 /// declaration *other* than on the declarator itself (for which, use 454 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it 455 /// didn't apply in whatever position it was written in, try to move 456 /// it to a more appropriate position. 457 static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 458 ParsedAttr &attr, QualType type) { 459 Declarator &declarator = state.getDeclarator(); 460 461 // Move it to the outermost normal or block pointer declarator. 462 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 463 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 464 switch (chunk.Kind) { 465 case DeclaratorChunk::Pointer: 466 case DeclaratorChunk::BlockPointer: { 467 // But don't move an ARC ownership attribute to the return type 468 // of a block. 469 DeclaratorChunk *destChunk = nullptr; 470 if (state.isProcessingDeclSpec() && 471 attr.getKind() == ParsedAttr::AT_ObjCOwnership) 472 destChunk = maybeMovePastReturnType(declarator, i - 1, 473 /*onlyBlockPointers=*/true); 474 if (!destChunk) destChunk = &chunk; 475 476 moveAttrFromListToList(attr, state.getCurrentAttributes(), 477 destChunk->getAttrs()); 478 return; 479 } 480 481 case DeclaratorChunk::Paren: 482 case DeclaratorChunk::Array: 483 continue; 484 485 // We may be starting at the return type of a block. 486 case DeclaratorChunk::Function: 487 if (state.isProcessingDeclSpec() && 488 attr.getKind() == ParsedAttr::AT_ObjCOwnership) { 489 if (DeclaratorChunk *dest = maybeMovePastReturnType( 490 declarator, i, 491 /*onlyBlockPointers=*/true)) { 492 moveAttrFromListToList(attr, state.getCurrentAttributes(), 493 dest->getAttrs()); 494 return; 495 } 496 } 497 goto error; 498 499 // Don't walk through these. 500 case DeclaratorChunk::Reference: 501 case DeclaratorChunk::MemberPointer: 502 case DeclaratorChunk::Pipe: 503 goto error; 504 } 505 } 506 error: 507 508 diagnoseBadTypeAttribute(state.getSema(), attr, type); 509 } 510 511 /// Distribute an objc_gc type attribute that was written on the 512 /// declarator. 513 static void distributeObjCPointerTypeAttrFromDeclarator( 514 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) { 515 Declarator &declarator = state.getDeclarator(); 516 517 // objc_gc goes on the innermost pointer to something that's not a 518 // pointer. 519 unsigned innermost = -1U; 520 bool considerDeclSpec = true; 521 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 522 DeclaratorChunk &chunk = declarator.getTypeObject(i); 523 switch (chunk.Kind) { 524 case DeclaratorChunk::Pointer: 525 case DeclaratorChunk::BlockPointer: 526 innermost = i; 527 continue; 528 529 case DeclaratorChunk::Reference: 530 case DeclaratorChunk::MemberPointer: 531 case DeclaratorChunk::Paren: 532 case DeclaratorChunk::Array: 533 case DeclaratorChunk::Pipe: 534 continue; 535 536 case DeclaratorChunk::Function: 537 considerDeclSpec = false; 538 goto done; 539 } 540 } 541 done: 542 543 // That might actually be the decl spec if we weren't blocked by 544 // anything in the declarator. 545 if (considerDeclSpec) { 546 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 547 // Splice the attribute into the decl spec. Prevents the 548 // attribute from being applied multiple times and gives 549 // the source-location-filler something to work with. 550 state.saveDeclSpecAttrs(); 551 declarator.getMutableDeclSpec().getAttributes().takeOneFrom( 552 declarator.getAttributes(), &attr); 553 return; 554 } 555 } 556 557 // Otherwise, if we found an appropriate chunk, splice the attribute 558 // into it. 559 if (innermost != -1U) { 560 moveAttrFromListToList(attr, declarator.getAttributes(), 561 declarator.getTypeObject(innermost).getAttrs()); 562 return; 563 } 564 565 // Otherwise, diagnose when we're done building the type. 566 declarator.getAttributes().remove(&attr); 567 state.addIgnoredTypeAttr(attr); 568 } 569 570 /// A function type attribute was written somewhere in a declaration 571 /// *other* than on the declarator itself or in the decl spec. Given 572 /// that it didn't apply in whatever position it was written in, try 573 /// to move it to a more appropriate position. 574 static void distributeFunctionTypeAttr(TypeProcessingState &state, 575 ParsedAttr &attr, QualType type) { 576 Declarator &declarator = state.getDeclarator(); 577 578 // Try to push the attribute from the return type of a function to 579 // the function itself. 580 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 581 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 582 switch (chunk.Kind) { 583 case DeclaratorChunk::Function: 584 moveAttrFromListToList(attr, state.getCurrentAttributes(), 585 chunk.getAttrs()); 586 return; 587 588 case DeclaratorChunk::Paren: 589 case DeclaratorChunk::Pointer: 590 case DeclaratorChunk::BlockPointer: 591 case DeclaratorChunk::Array: 592 case DeclaratorChunk::Reference: 593 case DeclaratorChunk::MemberPointer: 594 case DeclaratorChunk::Pipe: 595 continue; 596 } 597 } 598 599 diagnoseBadTypeAttribute(state.getSema(), attr, type); 600 } 601 602 /// Try to distribute a function type attribute to the innermost 603 /// function chunk or type. Returns true if the attribute was 604 /// distributed, false if no location was found. 605 static bool distributeFunctionTypeAttrToInnermost( 606 TypeProcessingState &state, ParsedAttr &attr, 607 ParsedAttributesView &attrList, QualType &declSpecType) { 608 Declarator &declarator = state.getDeclarator(); 609 610 // Put it on the innermost function chunk, if there is one. 611 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 612 DeclaratorChunk &chunk = declarator.getTypeObject(i); 613 if (chunk.Kind != DeclaratorChunk::Function) continue; 614 615 moveAttrFromListToList(attr, attrList, chunk.getAttrs()); 616 return true; 617 } 618 619 return handleFunctionTypeAttr(state, attr, declSpecType); 620 } 621 622 /// A function type attribute was written in the decl spec. Try to 623 /// apply it somewhere. 624 static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 625 ParsedAttr &attr, 626 QualType &declSpecType) { 627 state.saveDeclSpecAttrs(); 628 629 // C++11 attributes before the decl specifiers actually appertain to 630 // the declarators. Move them straight there. We don't support the 631 // 'put them wherever you like' semantics we allow for GNU attributes. 632 if (attr.isCXX11Attribute()) { 633 moveAttrFromListToList(attr, state.getCurrentAttributes(), 634 state.getDeclarator().getAttributes()); 635 return; 636 } 637 638 // Try to distribute to the innermost. 639 if (distributeFunctionTypeAttrToInnermost( 640 state, attr, state.getCurrentAttributes(), declSpecType)) 641 return; 642 643 // If that failed, diagnose the bad attribute when the declarator is 644 // fully built. 645 state.addIgnoredTypeAttr(attr); 646 } 647 648 /// A function type attribute was written on the declarator. Try to 649 /// apply it somewhere. 650 static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 651 ParsedAttr &attr, 652 QualType &declSpecType) { 653 Declarator &declarator = state.getDeclarator(); 654 655 // Try to distribute to the innermost. 656 if (distributeFunctionTypeAttrToInnermost( 657 state, attr, declarator.getAttributes(), declSpecType)) 658 return; 659 660 // If that failed, diagnose the bad attribute when the declarator is 661 // fully built. 662 declarator.getAttributes().remove(&attr); 663 state.addIgnoredTypeAttr(attr); 664 } 665 666 /// Given that there are attributes written on the declarator 667 /// itself, try to distribute any type attributes to the appropriate 668 /// declarator chunk. 669 /// 670 /// These are attributes like the following: 671 /// int f ATTR; 672 /// int (f ATTR)(); 673 /// but not necessarily this: 674 /// int f() ATTR; 675 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 676 QualType &declSpecType) { 677 // Collect all the type attributes from the declarator itself. 678 assert(!state.getDeclarator().getAttributes().empty() && 679 "declarator has no attrs!"); 680 // The called functions in this loop actually remove things from the current 681 // list, so iterating over the existing list isn't possible. Instead, make a 682 // non-owning copy and iterate over that. 683 ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()}; 684 for (ParsedAttr &attr : AttrsCopy) { 685 // Do not distribute C++11 attributes. They have strict rules for what 686 // they appertain to. 687 if (attr.isCXX11Attribute()) 688 continue; 689 690 switch (attr.getKind()) { 691 OBJC_POINTER_TYPE_ATTRS_CASELIST: 692 distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType); 693 break; 694 695 FUNCTION_TYPE_ATTRS_CASELIST: 696 distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType); 697 break; 698 699 MS_TYPE_ATTRS_CASELIST: 700 // Microsoft type attributes cannot go after the declarator-id. 701 continue; 702 703 NULLABILITY_TYPE_ATTRS_CASELIST: 704 // Nullability specifiers cannot go after the declarator-id. 705 706 // Objective-C __kindof does not get distributed. 707 case ParsedAttr::AT_ObjCKindOf: 708 continue; 709 710 default: 711 break; 712 } 713 } 714 } 715 716 /// Add a synthetic '()' to a block-literal declarator if it is 717 /// required, given the return type. 718 static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 719 QualType declSpecType) { 720 Declarator &declarator = state.getDeclarator(); 721 722 // First, check whether the declarator would produce a function, 723 // i.e. whether the innermost semantic chunk is a function. 724 if (declarator.isFunctionDeclarator()) { 725 // If so, make that declarator a prototyped declarator. 726 declarator.getFunctionTypeInfo().hasPrototype = true; 727 return; 728 } 729 730 // If there are any type objects, the type as written won't name a 731 // function, regardless of the decl spec type. This is because a 732 // block signature declarator is always an abstract-declarator, and 733 // abstract-declarators can't just be parentheses chunks. Therefore 734 // we need to build a function chunk unless there are no type 735 // objects and the decl spec type is a function. 736 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 737 return; 738 739 // Note that there *are* cases with invalid declarators where 740 // declarators consist solely of parentheses. In general, these 741 // occur only in failed efforts to make function declarators, so 742 // faking up the function chunk is still the right thing to do. 743 744 // Otherwise, we need to fake up a function declarator. 745 SourceLocation loc = declarator.getBeginLoc(); 746 747 // ...and *prepend* it to the declarator. 748 SourceLocation NoLoc; 749 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 750 /*HasProto=*/true, 751 /*IsAmbiguous=*/false, 752 /*LParenLoc=*/NoLoc, 753 /*ArgInfo=*/nullptr, 754 /*NumParams=*/0, 755 /*EllipsisLoc=*/NoLoc, 756 /*RParenLoc=*/NoLoc, 757 /*RefQualifierIsLvalueRef=*/true, 758 /*RefQualifierLoc=*/NoLoc, 759 /*MutableLoc=*/NoLoc, EST_None, 760 /*ESpecRange=*/SourceRange(), 761 /*Exceptions=*/nullptr, 762 /*ExceptionRanges=*/nullptr, 763 /*NumExceptions=*/0, 764 /*NoexceptExpr=*/nullptr, 765 /*ExceptionSpecTokens=*/nullptr, 766 /*DeclsInPrototype=*/None, loc, loc, declarator)); 767 768 // For consistency, make sure the state still has us as processing 769 // the decl spec. 770 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 771 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 772 } 773 774 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS, 775 unsigned &TypeQuals, 776 QualType TypeSoFar, 777 unsigned RemoveTQs, 778 unsigned DiagID) { 779 // If this occurs outside a template instantiation, warn the user about 780 // it; they probably didn't mean to specify a redundant qualifier. 781 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc; 782 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()), 783 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()), 784 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()), 785 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) { 786 if (!(RemoveTQs & Qual.first)) 787 continue; 788 789 if (!S.inTemplateInstantiation()) { 790 if (TypeQuals & Qual.first) 791 S.Diag(Qual.second, DiagID) 792 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar 793 << FixItHint::CreateRemoval(Qual.second); 794 } 795 796 TypeQuals &= ~Qual.first; 797 } 798 } 799 800 /// Return true if this is omitted block return type. Also check type 801 /// attributes and type qualifiers when returning true. 802 static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator, 803 QualType Result) { 804 if (!isOmittedBlockReturnType(declarator)) 805 return false; 806 807 // Warn if we see type attributes for omitted return type on a block literal. 808 SmallVector<ParsedAttr *, 2> ToBeRemoved; 809 for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) { 810 if (AL.isInvalid() || !AL.isTypeAttr()) 811 continue; 812 S.Diag(AL.getLoc(), 813 diag::warn_block_literal_attributes_on_omitted_return_type) 814 << AL.getName(); 815 ToBeRemoved.push_back(&AL); 816 } 817 // Remove bad attributes from the list. 818 for (ParsedAttr *AL : ToBeRemoved) 819 declarator.getMutableDeclSpec().getAttributes().remove(AL); 820 821 // Warn if we see type qualifiers for omitted return type on a block literal. 822 const DeclSpec &DS = declarator.getDeclSpec(); 823 unsigned TypeQuals = DS.getTypeQualifiers(); 824 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1, 825 diag::warn_block_literal_qualifiers_on_omitted_return_type); 826 declarator.getMutableDeclSpec().ClearTypeQualifiers(); 827 828 return true; 829 } 830 831 /// Apply Objective-C type arguments to the given type. 832 static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type, 833 ArrayRef<TypeSourceInfo *> typeArgs, 834 SourceRange typeArgsRange, 835 bool failOnError = false) { 836 // We can only apply type arguments to an Objective-C class type. 837 const auto *objcObjectType = type->getAs<ObjCObjectType>(); 838 if (!objcObjectType || !objcObjectType->getInterface()) { 839 S.Diag(loc, diag::err_objc_type_args_non_class) 840 << type 841 << typeArgsRange; 842 843 if (failOnError) 844 return QualType(); 845 return type; 846 } 847 848 // The class type must be parameterized. 849 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface(); 850 ObjCTypeParamList *typeParams = objcClass->getTypeParamList(); 851 if (!typeParams) { 852 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class) 853 << objcClass->getDeclName() 854 << FixItHint::CreateRemoval(typeArgsRange); 855 856 if (failOnError) 857 return QualType(); 858 859 return type; 860 } 861 862 // The type must not already be specialized. 863 if (objcObjectType->isSpecialized()) { 864 S.Diag(loc, diag::err_objc_type_args_specialized_class) 865 << type 866 << FixItHint::CreateRemoval(typeArgsRange); 867 868 if (failOnError) 869 return QualType(); 870 871 return type; 872 } 873 874 // Check the type arguments. 875 SmallVector<QualType, 4> finalTypeArgs; 876 unsigned numTypeParams = typeParams->size(); 877 bool anyPackExpansions = false; 878 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) { 879 TypeSourceInfo *typeArgInfo = typeArgs[i]; 880 QualType typeArg = typeArgInfo->getType(); 881 882 // Type arguments cannot have explicit qualifiers or nullability. 883 // We ignore indirect sources of these, e.g. behind typedefs or 884 // template arguments. 885 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) { 886 bool diagnosed = false; 887 SourceRange rangeToRemove; 888 if (auto attr = qual.getAs<AttributedTypeLoc>()) { 889 rangeToRemove = attr.getLocalSourceRange(); 890 if (attr.getTypePtr()->getImmediateNullability()) { 891 typeArg = attr.getTypePtr()->getModifiedType(); 892 S.Diag(attr.getBeginLoc(), 893 diag::err_objc_type_arg_explicit_nullability) 894 << typeArg << FixItHint::CreateRemoval(rangeToRemove); 895 diagnosed = true; 896 } 897 } 898 899 if (!diagnosed) { 900 S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified) 901 << typeArg << typeArg.getQualifiers().getAsString() 902 << FixItHint::CreateRemoval(rangeToRemove); 903 } 904 } 905 906 // Remove qualifiers even if they're non-local. 907 typeArg = typeArg.getUnqualifiedType(); 908 909 finalTypeArgs.push_back(typeArg); 910 911 if (typeArg->getAs<PackExpansionType>()) 912 anyPackExpansions = true; 913 914 // Find the corresponding type parameter, if there is one. 915 ObjCTypeParamDecl *typeParam = nullptr; 916 if (!anyPackExpansions) { 917 if (i < numTypeParams) { 918 typeParam = typeParams->begin()[i]; 919 } else { 920 // Too many arguments. 921 S.Diag(loc, diag::err_objc_type_args_wrong_arity) 922 << false 923 << objcClass->getDeclName() 924 << (unsigned)typeArgs.size() 925 << numTypeParams; 926 S.Diag(objcClass->getLocation(), diag::note_previous_decl) 927 << objcClass; 928 929 if (failOnError) 930 return QualType(); 931 932 return type; 933 } 934 } 935 936 // Objective-C object pointer types must be substitutable for the bounds. 937 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) { 938 // If we don't have a type parameter to match against, assume 939 // everything is fine. There was a prior pack expansion that 940 // means we won't be able to match anything. 941 if (!typeParam) { 942 assert(anyPackExpansions && "Too many arguments?"); 943 continue; 944 } 945 946 // Retrieve the bound. 947 QualType bound = typeParam->getUnderlyingType(); 948 const auto *boundObjC = bound->getAs<ObjCObjectPointerType>(); 949 950 // Determine whether the type argument is substitutable for the bound. 951 if (typeArgObjC->isObjCIdType()) { 952 // When the type argument is 'id', the only acceptable type 953 // parameter bound is 'id'. 954 if (boundObjC->isObjCIdType()) 955 continue; 956 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) { 957 // Otherwise, we follow the assignability rules. 958 continue; 959 } 960 961 // Diagnose the mismatch. 962 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(), 963 diag::err_objc_type_arg_does_not_match_bound) 964 << typeArg << bound << typeParam->getDeclName(); 965 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here) 966 << typeParam->getDeclName(); 967 968 if (failOnError) 969 return QualType(); 970 971 return type; 972 } 973 974 // Block pointer types are permitted for unqualified 'id' bounds. 975 if (typeArg->isBlockPointerType()) { 976 // If we don't have a type parameter to match against, assume 977 // everything is fine. There was a prior pack expansion that 978 // means we won't be able to match anything. 979 if (!typeParam) { 980 assert(anyPackExpansions && "Too many arguments?"); 981 continue; 982 } 983 984 // Retrieve the bound. 985 QualType bound = typeParam->getUnderlyingType(); 986 if (bound->isBlockCompatibleObjCPointerType(S.Context)) 987 continue; 988 989 // Diagnose the mismatch. 990 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(), 991 diag::err_objc_type_arg_does_not_match_bound) 992 << typeArg << bound << typeParam->getDeclName(); 993 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here) 994 << typeParam->getDeclName(); 995 996 if (failOnError) 997 return QualType(); 998 999 return type; 1000 } 1001 1002 // Dependent types will be checked at instantiation time. 1003 if (typeArg->isDependentType()) { 1004 continue; 1005 } 1006 1007 // Diagnose non-id-compatible type arguments. 1008 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(), 1009 diag::err_objc_type_arg_not_id_compatible) 1010 << typeArg << typeArgInfo->getTypeLoc().getSourceRange(); 1011 1012 if (failOnError) 1013 return QualType(); 1014 1015 return type; 1016 } 1017 1018 // Make sure we didn't have the wrong number of arguments. 1019 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) { 1020 S.Diag(loc, diag::err_objc_type_args_wrong_arity) 1021 << (typeArgs.size() < typeParams->size()) 1022 << objcClass->getDeclName() 1023 << (unsigned)finalTypeArgs.size() 1024 << (unsigned)numTypeParams; 1025 S.Diag(objcClass->getLocation(), diag::note_previous_decl) 1026 << objcClass; 1027 1028 if (failOnError) 1029 return QualType(); 1030 1031 return type; 1032 } 1033 1034 // Success. Form the specialized type. 1035 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false); 1036 } 1037 1038 QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl, 1039 SourceLocation ProtocolLAngleLoc, 1040 ArrayRef<ObjCProtocolDecl *> Protocols, 1041 ArrayRef<SourceLocation> ProtocolLocs, 1042 SourceLocation ProtocolRAngleLoc, 1043 bool FailOnError) { 1044 QualType Result = QualType(Decl->getTypeForDecl(), 0); 1045 if (!Protocols.empty()) { 1046 bool HasError; 1047 Result = Context.applyObjCProtocolQualifiers(Result, Protocols, 1048 HasError); 1049 if (HasError) { 1050 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers) 1051 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc); 1052 if (FailOnError) Result = QualType(); 1053 } 1054 if (FailOnError && Result.isNull()) 1055 return QualType(); 1056 } 1057 1058 return Result; 1059 } 1060 1061 QualType Sema::BuildObjCObjectType(QualType BaseType, 1062 SourceLocation Loc, 1063 SourceLocation TypeArgsLAngleLoc, 1064 ArrayRef<TypeSourceInfo *> TypeArgs, 1065 SourceLocation TypeArgsRAngleLoc, 1066 SourceLocation ProtocolLAngleLoc, 1067 ArrayRef<ObjCProtocolDecl *> Protocols, 1068 ArrayRef<SourceLocation> ProtocolLocs, 1069 SourceLocation ProtocolRAngleLoc, 1070 bool FailOnError) { 1071 QualType Result = BaseType; 1072 if (!TypeArgs.empty()) { 1073 Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs, 1074 SourceRange(TypeArgsLAngleLoc, 1075 TypeArgsRAngleLoc), 1076 FailOnError); 1077 if (FailOnError && Result.isNull()) 1078 return QualType(); 1079 } 1080 1081 if (!Protocols.empty()) { 1082 bool HasError; 1083 Result = Context.applyObjCProtocolQualifiers(Result, Protocols, 1084 HasError); 1085 if (HasError) { 1086 Diag(Loc, diag::err_invalid_protocol_qualifiers) 1087 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc); 1088 if (FailOnError) Result = QualType(); 1089 } 1090 if (FailOnError && Result.isNull()) 1091 return QualType(); 1092 } 1093 1094 return Result; 1095 } 1096 1097 TypeResult Sema::actOnObjCProtocolQualifierType( 1098 SourceLocation lAngleLoc, 1099 ArrayRef<Decl *> protocols, 1100 ArrayRef<SourceLocation> protocolLocs, 1101 SourceLocation rAngleLoc) { 1102 // Form id<protocol-list>. 1103 QualType Result = Context.getObjCObjectType( 1104 Context.ObjCBuiltinIdTy, { }, 1105 llvm::makeArrayRef( 1106 (ObjCProtocolDecl * const *)protocols.data(), 1107 protocols.size()), 1108 false); 1109 Result = Context.getObjCObjectPointerType(Result); 1110 1111 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result); 1112 TypeLoc ResultTL = ResultTInfo->getTypeLoc(); 1113 1114 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>(); 1115 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit 1116 1117 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc() 1118 .castAs<ObjCObjectTypeLoc>(); 1119 ObjCObjectTL.setHasBaseTypeAsWritten(false); 1120 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation()); 1121 1122 // No type arguments. 1123 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation()); 1124 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation()); 1125 1126 // Fill in protocol qualifiers. 1127 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc); 1128 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc); 1129 for (unsigned i = 0, n = protocols.size(); i != n; ++i) 1130 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]); 1131 1132 // We're done. Return the completed type to the parser. 1133 return CreateParsedType(Result, ResultTInfo); 1134 } 1135 1136 TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers( 1137 Scope *S, 1138 SourceLocation Loc, 1139 ParsedType BaseType, 1140 SourceLocation TypeArgsLAngleLoc, 1141 ArrayRef<ParsedType> TypeArgs, 1142 SourceLocation TypeArgsRAngleLoc, 1143 SourceLocation ProtocolLAngleLoc, 1144 ArrayRef<Decl *> Protocols, 1145 ArrayRef<SourceLocation> ProtocolLocs, 1146 SourceLocation ProtocolRAngleLoc) { 1147 TypeSourceInfo *BaseTypeInfo = nullptr; 1148 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo); 1149 if (T.isNull()) 1150 return true; 1151 1152 // Handle missing type-source info. 1153 if (!BaseTypeInfo) 1154 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc); 1155 1156 // Extract type arguments. 1157 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos; 1158 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) { 1159 TypeSourceInfo *TypeArgInfo = nullptr; 1160 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo); 1161 if (TypeArg.isNull()) { 1162 ActualTypeArgInfos.clear(); 1163 break; 1164 } 1165 1166 assert(TypeArgInfo && "No type source info?"); 1167 ActualTypeArgInfos.push_back(TypeArgInfo); 1168 } 1169 1170 // Build the object type. 1171 QualType Result = BuildObjCObjectType( 1172 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(), 1173 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc, 1174 ProtocolLAngleLoc, 1175 llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(), 1176 Protocols.size()), 1177 ProtocolLocs, ProtocolRAngleLoc, 1178 /*FailOnError=*/false); 1179 1180 if (Result == T) 1181 return BaseType; 1182 1183 // Create source information for this type. 1184 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result); 1185 TypeLoc ResultTL = ResultTInfo->getTypeLoc(); 1186 1187 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an 1188 // object pointer type. Fill in source information for it. 1189 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) { 1190 // The '*' is implicit. 1191 ObjCObjectPointerTL.setStarLoc(SourceLocation()); 1192 ResultTL = ObjCObjectPointerTL.getPointeeLoc(); 1193 } 1194 1195 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) { 1196 // Protocol qualifier information. 1197 if (OTPTL.getNumProtocols() > 0) { 1198 assert(OTPTL.getNumProtocols() == Protocols.size()); 1199 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc); 1200 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc); 1201 for (unsigned i = 0, n = Protocols.size(); i != n; ++i) 1202 OTPTL.setProtocolLoc(i, ProtocolLocs[i]); 1203 } 1204 1205 // We're done. Return the completed type to the parser. 1206 return CreateParsedType(Result, ResultTInfo); 1207 } 1208 1209 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>(); 1210 1211 // Type argument information. 1212 if (ObjCObjectTL.getNumTypeArgs() > 0) { 1213 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size()); 1214 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc); 1215 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc); 1216 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i) 1217 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]); 1218 } else { 1219 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation()); 1220 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation()); 1221 } 1222 1223 // Protocol qualifier information. 1224 if (ObjCObjectTL.getNumProtocols() > 0) { 1225 assert(ObjCObjectTL.getNumProtocols() == Protocols.size()); 1226 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc); 1227 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc); 1228 for (unsigned i = 0, n = Protocols.size(); i != n; ++i) 1229 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]); 1230 } else { 1231 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation()); 1232 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation()); 1233 } 1234 1235 // Base type. 1236 ObjCObjectTL.setHasBaseTypeAsWritten(true); 1237 if (ObjCObjectTL.getType() == T) 1238 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc()); 1239 else 1240 ObjCObjectTL.getBaseLoc().initialize(Context, Loc); 1241 1242 // We're done. Return the completed type to the parser. 1243 return CreateParsedType(Result, ResultTInfo); 1244 } 1245 1246 static OpenCLAccessAttr::Spelling 1247 getImageAccess(const ParsedAttributesView &Attrs) { 1248 for (const ParsedAttr &AL : Attrs) 1249 if (AL.getKind() == ParsedAttr::AT_OpenCLAccess) 1250 return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling()); 1251 return OpenCLAccessAttr::Keyword_read_only; 1252 } 1253 1254 /// Convert the specified declspec to the appropriate type 1255 /// object. 1256 /// \param state Specifies the declarator containing the declaration specifier 1257 /// to be converted, along with other associated processing state. 1258 /// \returns The type described by the declaration specifiers. This function 1259 /// never returns null. 1260 static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 1261 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 1262 // checking. 1263 1264 Sema &S = state.getSema(); 1265 Declarator &declarator = state.getDeclarator(); 1266 DeclSpec &DS = declarator.getMutableDeclSpec(); 1267 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 1268 if (DeclLoc.isInvalid()) 1269 DeclLoc = DS.getBeginLoc(); 1270 1271 ASTContext &Context = S.Context; 1272 1273 QualType Result; 1274 switch (DS.getTypeSpecType()) { 1275 case DeclSpec::TST_void: 1276 Result = Context.VoidTy; 1277 break; 1278 case DeclSpec::TST_char: 1279 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 1280 Result = Context.CharTy; 1281 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 1282 Result = Context.SignedCharTy; 1283 else { 1284 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 1285 "Unknown TSS value"); 1286 Result = Context.UnsignedCharTy; 1287 } 1288 break; 1289 case DeclSpec::TST_wchar: 1290 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 1291 Result = Context.WCharTy; 1292 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 1293 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 1294 << DS.getSpecifierName(DS.getTypeSpecType(), 1295 Context.getPrintingPolicy()); 1296 Result = Context.getSignedWCharType(); 1297 } else { 1298 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 1299 "Unknown TSS value"); 1300 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 1301 << DS.getSpecifierName(DS.getTypeSpecType(), 1302 Context.getPrintingPolicy()); 1303 Result = Context.getUnsignedWCharType(); 1304 } 1305 break; 1306 case DeclSpec::TST_char8: 1307 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 1308 "Unknown TSS value"); 1309 Result = Context.Char8Ty; 1310 break; 1311 case DeclSpec::TST_char16: 1312 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 1313 "Unknown TSS value"); 1314 Result = Context.Char16Ty; 1315 break; 1316 case DeclSpec::TST_char32: 1317 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 1318 "Unknown TSS value"); 1319 Result = Context.Char32Ty; 1320 break; 1321 case DeclSpec::TST_unspecified: 1322 // If this is a missing declspec in a block literal return context, then it 1323 // is inferred from the return statements inside the block. 1324 // The declspec is always missing in a lambda expr context; it is either 1325 // specified with a trailing return type or inferred. 1326 if (S.getLangOpts().CPlusPlus14 && 1327 declarator.getContext() == DeclaratorContext::LambdaExprContext) { 1328 // In C++1y, a lambda's implicit return type is 'auto'. 1329 Result = Context.getAutoDeductType(); 1330 break; 1331 } else if (declarator.getContext() == 1332 DeclaratorContext::LambdaExprContext || 1333 checkOmittedBlockReturnType(S, declarator, 1334 Context.DependentTy)) { 1335 Result = Context.DependentTy; 1336 break; 1337 } 1338 1339 // Unspecified typespec defaults to int in C90. However, the C90 grammar 1340 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 1341 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 1342 // Note that the one exception to this is function definitions, which are 1343 // allowed to be completely missing a declspec. This is handled in the 1344 // parser already though by it pretending to have seen an 'int' in this 1345 // case. 1346 if (S.getLangOpts().ImplicitInt) { 1347 // In C89 mode, we only warn if there is a completely missing declspec 1348 // when one is not allowed. 1349 if (DS.isEmpty()) { 1350 S.Diag(DeclLoc, diag::ext_missing_declspec) 1351 << DS.getSourceRange() 1352 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int"); 1353 } 1354 } else if (!DS.hasTypeSpecifier()) { 1355 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 1356 // "At least one type specifier shall be given in the declaration 1357 // specifiers in each declaration, and in the specifier-qualifier list in 1358 // each struct declaration and type name." 1359 if (S.getLangOpts().CPlusPlus && !DS.isTypeSpecPipe()) { 1360 S.Diag(DeclLoc, diag::err_missing_type_specifier) 1361 << DS.getSourceRange(); 1362 1363 // When this occurs in C++ code, often something is very broken with the 1364 // value being declared, poison it as invalid so we don't get chains of 1365 // errors. 1366 declarator.setInvalidType(true); 1367 } else if ((S.getLangOpts().OpenCLVersion >= 200 || 1368 S.getLangOpts().OpenCLCPlusPlus) && 1369 DS.isTypeSpecPipe()) { 1370 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type) 1371 << DS.getSourceRange(); 1372 declarator.setInvalidType(true); 1373 } else { 1374 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 1375 << DS.getSourceRange(); 1376 } 1377 } 1378 1379 LLVM_FALLTHROUGH; 1380 case DeclSpec::TST_int: { 1381 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 1382 switch (DS.getTypeSpecWidth()) { 1383 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 1384 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 1385 case DeclSpec::TSW_long: Result = Context.LongTy; break; 1386 case DeclSpec::TSW_longlong: 1387 Result = Context.LongLongTy; 1388 1389 // 'long long' is a C99 or C++11 feature. 1390 if (!S.getLangOpts().C99) { 1391 if (S.getLangOpts().CPlusPlus) 1392 S.Diag(DS.getTypeSpecWidthLoc(), 1393 S.getLangOpts().CPlusPlus11 ? 1394 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 1395 else 1396 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 1397 } 1398 break; 1399 } 1400 } else { 1401 switch (DS.getTypeSpecWidth()) { 1402 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 1403 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 1404 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 1405 case DeclSpec::TSW_longlong: 1406 Result = Context.UnsignedLongLongTy; 1407 1408 // 'long long' is a C99 or C++11 feature. 1409 if (!S.getLangOpts().C99) { 1410 if (S.getLangOpts().CPlusPlus) 1411 S.Diag(DS.getTypeSpecWidthLoc(), 1412 S.getLangOpts().CPlusPlus11 ? 1413 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 1414 else 1415 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 1416 } 1417 break; 1418 } 1419 } 1420 break; 1421 } 1422 case DeclSpec::TST_accum: { 1423 switch (DS.getTypeSpecWidth()) { 1424 case DeclSpec::TSW_short: 1425 Result = Context.ShortAccumTy; 1426 break; 1427 case DeclSpec::TSW_unspecified: 1428 Result = Context.AccumTy; 1429 break; 1430 case DeclSpec::TSW_long: 1431 Result = Context.LongAccumTy; 1432 break; 1433 case DeclSpec::TSW_longlong: 1434 llvm_unreachable("Unable to specify long long as _Accum width"); 1435 } 1436 1437 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 1438 Result = Context.getCorrespondingUnsignedType(Result); 1439 1440 if (DS.isTypeSpecSat()) 1441 Result = Context.getCorrespondingSaturatedType(Result); 1442 1443 break; 1444 } 1445 case DeclSpec::TST_fract: { 1446 switch (DS.getTypeSpecWidth()) { 1447 case DeclSpec::TSW_short: 1448 Result = Context.ShortFractTy; 1449 break; 1450 case DeclSpec::TSW_unspecified: 1451 Result = Context.FractTy; 1452 break; 1453 case DeclSpec::TSW_long: 1454 Result = Context.LongFractTy; 1455 break; 1456 case DeclSpec::TSW_longlong: 1457 llvm_unreachable("Unable to specify long long as _Fract width"); 1458 } 1459 1460 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 1461 Result = Context.getCorrespondingUnsignedType(Result); 1462 1463 if (DS.isTypeSpecSat()) 1464 Result = Context.getCorrespondingSaturatedType(Result); 1465 1466 break; 1467 } 1468 case DeclSpec::TST_int128: 1469 if (!S.Context.getTargetInfo().hasInt128Type() && 1470 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice)) 1471 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) 1472 << "__int128"; 1473 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 1474 Result = Context.UnsignedInt128Ty; 1475 else 1476 Result = Context.Int128Ty; 1477 break; 1478 case DeclSpec::TST_float16: 1479 // CUDA host and device may have different _Float16 support, therefore 1480 // do not diagnose _Float16 usage to avoid false alarm. 1481 // ToDo: more precise diagnostics for CUDA. 1482 if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA && 1483 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice)) 1484 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) 1485 << "_Float16"; 1486 Result = Context.Float16Ty; 1487 break; 1488 case DeclSpec::TST_half: Result = Context.HalfTy; break; 1489 case DeclSpec::TST_float: Result = Context.FloatTy; break; 1490 case DeclSpec::TST_double: 1491 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 1492 Result = Context.LongDoubleTy; 1493 else 1494 Result = Context.DoubleTy; 1495 break; 1496 case DeclSpec::TST_float128: 1497 if (!S.Context.getTargetInfo().hasFloat128Type() && 1498 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice)) 1499 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) 1500 << "__float128"; 1501 Result = Context.Float128Ty; 1502 break; 1503 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 1504 break; 1505 case DeclSpec::TST_decimal32: // _Decimal32 1506 case DeclSpec::TST_decimal64: // _Decimal64 1507 case DeclSpec::TST_decimal128: // _Decimal128 1508 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 1509 Result = Context.IntTy; 1510 declarator.setInvalidType(true); 1511 break; 1512 case DeclSpec::TST_class: 1513 case DeclSpec::TST_enum: 1514 case DeclSpec::TST_union: 1515 case DeclSpec::TST_struct: 1516 case DeclSpec::TST_interface: { 1517 TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl()); 1518 if (!D) { 1519 // This can happen in C++ with ambiguous lookups. 1520 Result = Context.IntTy; 1521 declarator.setInvalidType(true); 1522 break; 1523 } 1524 1525 // If the type is deprecated or unavailable, diagnose it. 1526 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 1527 1528 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 1529 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 1530 1531 // TypeQuals handled by caller. 1532 Result = Context.getTypeDeclType(D); 1533 1534 // In both C and C++, make an ElaboratedType. 1535 ElaboratedTypeKeyword Keyword 1536 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 1537 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result, 1538 DS.isTypeSpecOwned() ? D : nullptr); 1539 break; 1540 } 1541 case DeclSpec::TST_typename: { 1542 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 1543 DS.getTypeSpecSign() == 0 && 1544 "Can't handle qualifiers on typedef names yet!"); 1545 Result = S.GetTypeFromParser(DS.getRepAsType()); 1546 if (Result.isNull()) { 1547 declarator.setInvalidType(true); 1548 } 1549 1550 // TypeQuals handled by caller. 1551 break; 1552 } 1553 case DeclSpec::TST_typeofType: 1554 // FIXME: Preserve type source info. 1555 Result = S.GetTypeFromParser(DS.getRepAsType()); 1556 assert(!Result.isNull() && "Didn't get a type for typeof?"); 1557 if (!Result->isDependentType()) 1558 if (const TagType *TT = Result->getAs<TagType>()) 1559 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 1560 // TypeQuals handled by caller. 1561 Result = Context.getTypeOfType(Result); 1562 break; 1563 case DeclSpec::TST_typeofExpr: { 1564 Expr *E = DS.getRepAsExpr(); 1565 assert(E && "Didn't get an expression for typeof?"); 1566 // TypeQuals handled by caller. 1567 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 1568 if (Result.isNull()) { 1569 Result = Context.IntTy; 1570 declarator.setInvalidType(true); 1571 } 1572 break; 1573 } 1574 case DeclSpec::TST_decltype: { 1575 Expr *E = DS.getRepAsExpr(); 1576 assert(E && "Didn't get an expression for decltype?"); 1577 // TypeQuals handled by caller. 1578 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 1579 if (Result.isNull()) { 1580 Result = Context.IntTy; 1581 declarator.setInvalidType(true); 1582 } 1583 break; 1584 } 1585 case DeclSpec::TST_underlyingType: 1586 Result = S.GetTypeFromParser(DS.getRepAsType()); 1587 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 1588 Result = S.BuildUnaryTransformType(Result, 1589 UnaryTransformType::EnumUnderlyingType, 1590 DS.getTypeSpecTypeLoc()); 1591 if (Result.isNull()) { 1592 Result = Context.IntTy; 1593 declarator.setInvalidType(true); 1594 } 1595 break; 1596 1597 case DeclSpec::TST_auto: 1598 Result = Context.getAutoType(QualType(), AutoTypeKeyword::Auto, false); 1599 break; 1600 1601 case DeclSpec::TST_auto_type: 1602 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false); 1603 break; 1604 1605 case DeclSpec::TST_decltype_auto: 1606 Result = Context.getAutoType(QualType(), AutoTypeKeyword::DecltypeAuto, 1607 /*IsDependent*/ false); 1608 break; 1609 1610 case DeclSpec::TST_unknown_anytype: 1611 Result = Context.UnknownAnyTy; 1612 break; 1613 1614 case DeclSpec::TST_atomic: 1615 Result = S.GetTypeFromParser(DS.getRepAsType()); 1616 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 1617 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 1618 if (Result.isNull()) { 1619 Result = Context.IntTy; 1620 declarator.setInvalidType(true); 1621 } 1622 break; 1623 1624 #define GENERIC_IMAGE_TYPE(ImgType, Id) \ 1625 case DeclSpec::TST_##ImgType##_t: \ 1626 switch (getImageAccess(DS.getAttributes())) { \ 1627 case OpenCLAccessAttr::Keyword_write_only: \ 1628 Result = Context.Id##WOTy; \ 1629 break; \ 1630 case OpenCLAccessAttr::Keyword_read_write: \ 1631 Result = Context.Id##RWTy; \ 1632 break; \ 1633 case OpenCLAccessAttr::Keyword_read_only: \ 1634 Result = Context.Id##ROTy; \ 1635 break; \ 1636 } \ 1637 break; 1638 #include "clang/Basic/OpenCLImageTypes.def" 1639 1640 case DeclSpec::TST_error: 1641 Result = Context.IntTy; 1642 declarator.setInvalidType(true); 1643 break; 1644 } 1645 1646 if (S.getLangOpts().OpenCL && 1647 S.checkOpenCLDisabledTypeDeclSpec(DS, Result)) 1648 declarator.setInvalidType(true); 1649 1650 bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum || 1651 DS.getTypeSpecType() == DeclSpec::TST_fract; 1652 1653 // Only fixed point types can be saturated 1654 if (DS.isTypeSpecSat() && !IsFixedPointType) 1655 S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec) 1656 << DS.getSpecifierName(DS.getTypeSpecType(), 1657 Context.getPrintingPolicy()); 1658 1659 // Handle complex types. 1660 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 1661 if (S.getLangOpts().Freestanding) 1662 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 1663 Result = Context.getComplexType(Result); 1664 } else if (DS.isTypeAltiVecVector()) { 1665 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 1666 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 1667 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 1668 if (DS.isTypeAltiVecPixel()) 1669 VecKind = VectorType::AltiVecPixel; 1670 else if (DS.isTypeAltiVecBool()) 1671 VecKind = VectorType::AltiVecBool; 1672 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 1673 } 1674 1675 // FIXME: Imaginary. 1676 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 1677 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 1678 1679 // Before we process any type attributes, synthesize a block literal 1680 // function declarator if necessary. 1681 if (declarator.getContext() == DeclaratorContext::BlockLiteralContext) 1682 maybeSynthesizeBlockSignature(state, Result); 1683 1684 // Apply any type attributes from the decl spec. This may cause the 1685 // list of type attributes to be temporarily saved while the type 1686 // attributes are pushed around. 1687 // pipe attributes will be handled later ( at GetFullTypeForDeclarator ) 1688 if (!DS.isTypeSpecPipe()) 1689 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes()); 1690 1691 // Apply const/volatile/restrict qualifiers to T. 1692 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1693 // Warn about CV qualifiers on function types. 1694 // C99 6.7.3p8: 1695 // If the specification of a function type includes any type qualifiers, 1696 // the behavior is undefined. 1697 // C++11 [dcl.fct]p7: 1698 // The effect of a cv-qualifier-seq in a function declarator is not the 1699 // same as adding cv-qualification on top of the function type. In the 1700 // latter case, the cv-qualifiers are ignored. 1701 if (TypeQuals && Result->isFunctionType()) { 1702 diagnoseAndRemoveTypeQualifiers( 1703 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile, 1704 S.getLangOpts().CPlusPlus 1705 ? diag::warn_typecheck_function_qualifiers_ignored 1706 : diag::warn_typecheck_function_qualifiers_unspecified); 1707 // No diagnostic for 'restrict' or '_Atomic' applied to a 1708 // function type; we'll diagnose those later, in BuildQualifiedType. 1709 } 1710 1711 // C++11 [dcl.ref]p1: 1712 // Cv-qualified references are ill-formed except when the 1713 // cv-qualifiers are introduced through the use of a typedef-name 1714 // or decltype-specifier, in which case the cv-qualifiers are ignored. 1715 // 1716 // There don't appear to be any other contexts in which a cv-qualified 1717 // reference type could be formed, so the 'ill-formed' clause here appears 1718 // to never happen. 1719 if (TypeQuals && Result->isReferenceType()) { 1720 diagnoseAndRemoveTypeQualifiers( 1721 S, DS, TypeQuals, Result, 1722 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic, 1723 diag::warn_typecheck_reference_qualifiers); 1724 } 1725 1726 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1727 // than once in the same specifier-list or qualifier-list, either directly 1728 // or via one or more typedefs." 1729 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1730 && TypeQuals & Result.getCVRQualifiers()) { 1731 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1732 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1733 << "const"; 1734 } 1735 1736 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1737 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1738 << "volatile"; 1739 } 1740 1741 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to 1742 // produce a warning in this case. 1743 } 1744 1745 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); 1746 1747 // If adding qualifiers fails, just use the unqualified type. 1748 if (Qualified.isNull()) 1749 declarator.setInvalidType(true); 1750 else 1751 Result = Qualified; 1752 } 1753 1754 assert(!Result.isNull() && "This function should not return a null type"); 1755 return Result; 1756 } 1757 1758 static std::string getPrintableNameForEntity(DeclarationName Entity) { 1759 if (Entity) 1760 return Entity.getAsString(); 1761 1762 return "type name"; 1763 } 1764 1765 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1766 Qualifiers Qs, const DeclSpec *DS) { 1767 if (T.isNull()) 1768 return QualType(); 1769 1770 // Ignore any attempt to form a cv-qualified reference. 1771 if (T->isReferenceType()) { 1772 Qs.removeConst(); 1773 Qs.removeVolatile(); 1774 } 1775 1776 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1777 // object or incomplete types shall not be restrict-qualified." 1778 if (Qs.hasRestrict()) { 1779 unsigned DiagID = 0; 1780 QualType ProblemTy; 1781 1782 if (T->isAnyPointerType() || T->isReferenceType() || 1783 T->isMemberPointerType()) { 1784 QualType EltTy; 1785 if (T->isObjCObjectPointerType()) 1786 EltTy = T; 1787 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>()) 1788 EltTy = PTy->getPointeeType(); 1789 else 1790 EltTy = T->getPointeeType(); 1791 1792 // If we have a pointer or reference, the pointee must have an object 1793 // incomplete type. 1794 if (!EltTy->isIncompleteOrObjectType()) { 1795 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1796 ProblemTy = EltTy; 1797 } 1798 } else if (!T->isDependentType()) { 1799 DiagID = diag::err_typecheck_invalid_restrict_not_pointer; 1800 ProblemTy = T; 1801 } 1802 1803 if (DiagID) { 1804 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; 1805 Qs.removeRestrict(); 1806 } 1807 } 1808 1809 return Context.getQualifiedType(T, Qs); 1810 } 1811 1812 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1813 unsigned CVRAU, const DeclSpec *DS) { 1814 if (T.isNull()) 1815 return QualType(); 1816 1817 // Ignore any attempt to form a cv-qualified reference. 1818 if (T->isReferenceType()) 1819 CVRAU &= 1820 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic); 1821 1822 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and 1823 // TQ_unaligned; 1824 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned); 1825 1826 // C11 6.7.3/5: 1827 // If the same qualifier appears more than once in the same 1828 // specifier-qualifier-list, either directly or via one or more typedefs, 1829 // the behavior is the same as if it appeared only once. 1830 // 1831 // It's not specified what happens when the _Atomic qualifier is applied to 1832 // a type specified with the _Atomic specifier, but we assume that this 1833 // should be treated as if the _Atomic qualifier appeared multiple times. 1834 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) { 1835 // C11 6.7.3/5: 1836 // If other qualifiers appear along with the _Atomic qualifier in a 1837 // specifier-qualifier-list, the resulting type is the so-qualified 1838 // atomic type. 1839 // 1840 // Don't need to worry about array types here, since _Atomic can't be 1841 // applied to such types. 1842 SplitQualType Split = T.getSplitUnqualifiedType(); 1843 T = BuildAtomicType(QualType(Split.Ty, 0), 1844 DS ? DS->getAtomicSpecLoc() : Loc); 1845 if (T.isNull()) 1846 return T; 1847 Split.Quals.addCVRQualifiers(CVR); 1848 return BuildQualifiedType(T, Loc, Split.Quals); 1849 } 1850 1851 Qualifiers Q = Qualifiers::fromCVRMask(CVR); 1852 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned); 1853 return BuildQualifiedType(T, Loc, Q, DS); 1854 } 1855 1856 /// Build a paren type including \p T. 1857 QualType Sema::BuildParenType(QualType T) { 1858 return Context.getParenType(T); 1859 } 1860 1861 /// Given that we're building a pointer or reference to the given 1862 static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1863 SourceLocation loc, 1864 bool isReference) { 1865 // Bail out if retention is unrequired or already specified. 1866 if (!type->isObjCLifetimeType() || 1867 type.getObjCLifetime() != Qualifiers::OCL_None) 1868 return type; 1869 1870 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1871 1872 // If the object type is const-qualified, we can safely use 1873 // __unsafe_unretained. This is safe (because there are no read 1874 // barriers), and it'll be safe to coerce anything but __weak* to 1875 // the resulting type. 1876 if (type.isConstQualified()) { 1877 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1878 1879 // Otherwise, check whether the static type does not require 1880 // retaining. This currently only triggers for Class (possibly 1881 // protocol-qualifed, and arrays thereof). 1882 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1883 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1884 1885 // If we are in an unevaluated context, like sizeof, skip adding a 1886 // qualification. 1887 } else if (S.isUnevaluatedContext()) { 1888 return type; 1889 1890 // If that failed, give an error and recover using __strong. __strong 1891 // is the option most likely to prevent spurious second-order diagnostics, 1892 // like when binding a reference to a field. 1893 } else { 1894 // These types can show up in private ivars in system headers, so 1895 // we need this to not be an error in those cases. Instead we 1896 // want to delay. 1897 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1898 S.DelayedDiagnostics.add( 1899 sema::DelayedDiagnostic::makeForbiddenType(loc, 1900 diag::err_arc_indirect_no_ownership, type, isReference)); 1901 } else { 1902 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1903 } 1904 implicitLifetime = Qualifiers::OCL_Strong; 1905 } 1906 assert(implicitLifetime && "didn't infer any lifetime!"); 1907 1908 Qualifiers qs; 1909 qs.addObjCLifetime(implicitLifetime); 1910 return S.Context.getQualifiedType(type, qs); 1911 } 1912 1913 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 1914 std::string Quals = FnTy->getMethodQuals().getAsString(); 1915 1916 switch (FnTy->getRefQualifier()) { 1917 case RQ_None: 1918 break; 1919 1920 case RQ_LValue: 1921 if (!Quals.empty()) 1922 Quals += ' '; 1923 Quals += '&'; 1924 break; 1925 1926 case RQ_RValue: 1927 if (!Quals.empty()) 1928 Quals += ' '; 1929 Quals += "&&"; 1930 break; 1931 } 1932 1933 return Quals; 1934 } 1935 1936 namespace { 1937 /// Kinds of declarator that cannot contain a qualified function type. 1938 /// 1939 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: 1940 /// a function type with a cv-qualifier or a ref-qualifier can only appear 1941 /// at the topmost level of a type. 1942 /// 1943 /// Parens and member pointers are permitted. We don't diagnose array and 1944 /// function declarators, because they don't allow function types at all. 1945 /// 1946 /// The values of this enum are used in diagnostics. 1947 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference }; 1948 } // end anonymous namespace 1949 1950 /// Check whether the type T is a qualified function type, and if it is, 1951 /// diagnose that it cannot be contained within the given kind of declarator. 1952 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc, 1953 QualifiedFunctionKind QFK) { 1954 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 1955 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>(); 1956 if (!FPT || (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None)) 1957 return false; 1958 1959 S.Diag(Loc, diag::err_compound_qualified_function_type) 1960 << QFK << isa<FunctionType>(T.IgnoreParens()) << T 1961 << getFunctionQualifiersAsString(FPT); 1962 return true; 1963 } 1964 1965 /// Build a pointer type. 1966 /// 1967 /// \param T The type to which we'll be building a pointer. 1968 /// 1969 /// \param Loc The location of the entity whose type involves this 1970 /// pointer type or, if there is no such entity, the location of the 1971 /// type that will have pointer type. 1972 /// 1973 /// \param Entity The name of the entity that involves the pointer 1974 /// type, if known. 1975 /// 1976 /// \returns A suitable pointer type, if there are no 1977 /// errors. Otherwise, returns a NULL type. 1978 QualType Sema::BuildPointerType(QualType T, 1979 SourceLocation Loc, DeclarationName Entity) { 1980 if (T->isReferenceType()) { 1981 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1982 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1983 << getPrintableNameForEntity(Entity) << T; 1984 return QualType(); 1985 } 1986 1987 if (T->isFunctionType() && getLangOpts().OpenCL) { 1988 Diag(Loc, diag::err_opencl_function_pointer); 1989 return QualType(); 1990 } 1991 1992 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer)) 1993 return QualType(); 1994 1995 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1996 1997 // In ARC, it is forbidden to build pointers to unqualified pointers. 1998 if (getLangOpts().ObjCAutoRefCount) 1999 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 2000 2001 // Build the pointer type. 2002 return Context.getPointerType(T); 2003 } 2004 2005 /// Build a reference type. 2006 /// 2007 /// \param T The type to which we'll be building a reference. 2008 /// 2009 /// \param Loc The location of the entity whose type involves this 2010 /// reference type or, if there is no such entity, the location of the 2011 /// type that will have reference type. 2012 /// 2013 /// \param Entity The name of the entity that involves the reference 2014 /// type, if known. 2015 /// 2016 /// \returns A suitable reference type, if there are no 2017 /// errors. Otherwise, returns a NULL type. 2018 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 2019 SourceLocation Loc, 2020 DeclarationName Entity) { 2021 assert(Context.getCanonicalType(T) != Context.OverloadTy && 2022 "Unresolved overloaded function type"); 2023 2024 // C++0x [dcl.ref]p6: 2025 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 2026 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 2027 // type T, an attempt to create the type "lvalue reference to cv TR" creates 2028 // the type "lvalue reference to T", while an attempt to create the type 2029 // "rvalue reference to cv TR" creates the type TR. 2030 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 2031 2032 // C++ [dcl.ref]p4: There shall be no references to references. 2033 // 2034 // According to C++ DR 106, references to references are only 2035 // diagnosed when they are written directly (e.g., "int & &"), 2036 // but not when they happen via a typedef: 2037 // 2038 // typedef int& intref; 2039 // typedef intref& intref2; 2040 // 2041 // Parser::ParseDeclaratorInternal diagnoses the case where 2042 // references are written directly; here, we handle the 2043 // collapsing of references-to-references as described in C++0x. 2044 // DR 106 and 540 introduce reference-collapsing into C++98/03. 2045 2046 // C++ [dcl.ref]p1: 2047 // A declarator that specifies the type "reference to cv void" 2048 // is ill-formed. 2049 if (T->isVoidType()) { 2050 Diag(Loc, diag::err_reference_to_void); 2051 return QualType(); 2052 } 2053 2054 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference)) 2055 return QualType(); 2056 2057 // In ARC, it is forbidden to build references to unqualified pointers. 2058 if (getLangOpts().ObjCAutoRefCount) 2059 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 2060 2061 // Handle restrict on references. 2062 if (LValueRef) 2063 return Context.getLValueReferenceType(T, SpelledAsLValue); 2064 return Context.getRValueReferenceType(T); 2065 } 2066 2067 /// Build a Read-only Pipe type. 2068 /// 2069 /// \param T The type to which we'll be building a Pipe. 2070 /// 2071 /// \param Loc We do not use it for now. 2072 /// 2073 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a 2074 /// NULL type. 2075 QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) { 2076 return Context.getReadPipeType(T); 2077 } 2078 2079 /// Build a Write-only Pipe type. 2080 /// 2081 /// \param T The type to which we'll be building a Pipe. 2082 /// 2083 /// \param Loc We do not use it for now. 2084 /// 2085 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a 2086 /// NULL type. 2087 QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) { 2088 return Context.getWritePipeType(T); 2089 } 2090 2091 /// Check whether the specified array size makes the array type a VLA. If so, 2092 /// return true, if not, return the size of the array in SizeVal. 2093 static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 2094 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 2095 // (like gnu99, but not c99) accept any evaluatable value as an extension. 2096 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 2097 public: 2098 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 2099 2100 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override { 2101 } 2102 2103 void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override { 2104 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 2105 } 2106 } Diagnoser; 2107 2108 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 2109 S.LangOpts.GNUMode || 2110 S.LangOpts.OpenCL).isInvalid(); 2111 } 2112 2113 /// Build an array type. 2114 /// 2115 /// \param T The type of each element in the array. 2116 /// 2117 /// \param ASM C99 array size modifier (e.g., '*', 'static'). 2118 /// 2119 /// \param ArraySize Expression describing the size of the array. 2120 /// 2121 /// \param Brackets The range from the opening '[' to the closing ']'. 2122 /// 2123 /// \param Entity The name of the entity that involves the array 2124 /// type, if known. 2125 /// 2126 /// \returns A suitable array type, if there are no errors. Otherwise, 2127 /// returns a NULL type. 2128 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 2129 Expr *ArraySize, unsigned Quals, 2130 SourceRange Brackets, DeclarationName Entity) { 2131 2132 SourceLocation Loc = Brackets.getBegin(); 2133 if (getLangOpts().CPlusPlus) { 2134 // C++ [dcl.array]p1: 2135 // T is called the array element type; this type shall not be a reference 2136 // type, the (possibly cv-qualified) type void, a function type or an 2137 // abstract class type. 2138 // 2139 // C++ [dcl.array]p3: 2140 // When several "array of" specifications are adjacent, [...] only the 2141 // first of the constant expressions that specify the bounds of the arrays 2142 // may be omitted. 2143 // 2144 // Note: function types are handled in the common path with C. 2145 if (T->isReferenceType()) { 2146 Diag(Loc, diag::err_illegal_decl_array_of_references) 2147 << getPrintableNameForEntity(Entity) << T; 2148 return QualType(); 2149 } 2150 2151 if (T->isVoidType() || T->isIncompleteArrayType()) { 2152 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 2153 return QualType(); 2154 } 2155 2156 if (RequireNonAbstractType(Brackets.getBegin(), T, 2157 diag::err_array_of_abstract_type)) 2158 return QualType(); 2159 2160 // Mentioning a member pointer type for an array type causes us to lock in 2161 // an inheritance model, even if it's inside an unused typedef. 2162 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) 2163 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) 2164 if (!MPTy->getClass()->isDependentType()) 2165 (void)isCompleteType(Loc, T); 2166 2167 } else { 2168 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 2169 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 2170 if (RequireCompleteType(Loc, T, 2171 diag::err_illegal_decl_array_incomplete_type)) 2172 return QualType(); 2173 } 2174 2175 if (T->isFunctionType()) { 2176 Diag(Loc, diag::err_illegal_decl_array_of_functions) 2177 << getPrintableNameForEntity(Entity) << T; 2178 return QualType(); 2179 } 2180 2181 if (const RecordType *EltTy = T->getAs<RecordType>()) { 2182 // If the element type is a struct or union that contains a variadic 2183 // array, accept it as a GNU extension: C99 6.7.2.1p2. 2184 if (EltTy->getDecl()->hasFlexibleArrayMember()) 2185 Diag(Loc, diag::ext_flexible_array_in_array) << T; 2186 } else if (T->isObjCObjectType()) { 2187 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 2188 return QualType(); 2189 } 2190 2191 // Do placeholder conversions on the array size expression. 2192 if (ArraySize && ArraySize->hasPlaceholderType()) { 2193 ExprResult Result = CheckPlaceholderExpr(ArraySize); 2194 if (Result.isInvalid()) return QualType(); 2195 ArraySize = Result.get(); 2196 } 2197 2198 // Do lvalue-to-rvalue conversions on the array size expression. 2199 if (ArraySize && !ArraySize->isRValue()) { 2200 ExprResult Result = DefaultLvalueConversion(ArraySize); 2201 if (Result.isInvalid()) 2202 return QualType(); 2203 2204 ArraySize = Result.get(); 2205 } 2206 2207 // C99 6.7.5.2p1: The size expression shall have integer type. 2208 // C++11 allows contextual conversions to such types. 2209 if (!getLangOpts().CPlusPlus11 && 2210 ArraySize && !ArraySize->isTypeDependent() && 2211 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 2212 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int) 2213 << ArraySize->getType() << ArraySize->getSourceRange(); 2214 return QualType(); 2215 } 2216 2217 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 2218 if (!ArraySize) { 2219 if (ASM == ArrayType::Star) 2220 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets); 2221 else 2222 T = Context.getIncompleteArrayType(T, ASM, Quals); 2223 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 2224 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 2225 } else if ((!T->isDependentType() && !T->isIncompleteType() && 2226 !T->isConstantSizeType()) || 2227 isArraySizeVLA(*this, ArraySize, ConstVal)) { 2228 // Even in C++11, don't allow contextual conversions in the array bound 2229 // of a VLA. 2230 if (getLangOpts().CPlusPlus11 && 2231 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 2232 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int) 2233 << ArraySize->getType() << ArraySize->getSourceRange(); 2234 return QualType(); 2235 } 2236 2237 // C99: an array with an element type that has a non-constant-size is a VLA. 2238 // C99: an array with a non-ICE size is a VLA. We accept any expression 2239 // that we can fold to a non-zero positive value as an extension. 2240 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 2241 } else { 2242 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 2243 // have a value greater than zero. 2244 if (ConstVal.isSigned() && ConstVal.isNegative()) { 2245 if (Entity) 2246 Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size) 2247 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 2248 else 2249 Diag(ArraySize->getBeginLoc(), diag::err_typecheck_negative_array_size) 2250 << ArraySize->getSourceRange(); 2251 return QualType(); 2252 } 2253 if (ConstVal == 0) { 2254 // GCC accepts zero sized static arrays. We allow them when 2255 // we're not in a SFINAE context. 2256 Diag(ArraySize->getBeginLoc(), isSFINAEContext() 2257 ? diag::err_typecheck_zero_array_size 2258 : diag::ext_typecheck_zero_array_size) 2259 << ArraySize->getSourceRange(); 2260 2261 if (ASM == ArrayType::Static) { 2262 Diag(ArraySize->getBeginLoc(), 2263 diag::warn_typecheck_zero_static_array_size) 2264 << ArraySize->getSourceRange(); 2265 ASM = ArrayType::Normal; 2266 } 2267 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 2268 !T->isIncompleteType() && !T->isUndeducedType()) { 2269 // Is the array too large? 2270 unsigned ActiveSizeBits 2271 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 2272 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2273 Diag(ArraySize->getBeginLoc(), diag::err_array_too_large) 2274 << ConstVal.toString(10) << ArraySize->getSourceRange(); 2275 return QualType(); 2276 } 2277 } 2278 2279 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 2280 } 2281 2282 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 2283 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 2284 Diag(Loc, diag::err_opencl_vla); 2285 return QualType(); 2286 } 2287 2288 if (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) { 2289 // CUDA device code and some other targets don't support VLAs. 2290 targetDiag(Loc, (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) 2291 ? diag::err_cuda_vla 2292 : diag::err_vla_unsupported) 2293 << ((getLangOpts().CUDA && getLangOpts().CUDAIsDevice) 2294 ? CurrentCUDATarget() 2295 : CFT_InvalidTarget); 2296 } 2297 2298 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 2299 if (!getLangOpts().C99) { 2300 if (T->isVariableArrayType()) { 2301 // Prohibit the use of VLAs during template argument deduction. 2302 if (isSFINAEContext()) { 2303 Diag(Loc, diag::err_vla_in_sfinae); 2304 return QualType(); 2305 } 2306 // Just extwarn about VLAs. 2307 else 2308 Diag(Loc, diag::ext_vla); 2309 } else if (ASM != ArrayType::Normal || Quals != 0) 2310 Diag(Loc, 2311 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 2312 : diag::ext_c99_array_usage) << ASM; 2313 } 2314 2315 if (T->isVariableArrayType()) { 2316 // Warn about VLAs for -Wvla. 2317 Diag(Loc, diag::warn_vla_used); 2318 } 2319 2320 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported. 2321 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported. 2322 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported. 2323 if (getLangOpts().OpenCL) { 2324 const QualType ArrType = Context.getBaseElementType(T); 2325 if (ArrType->isBlockPointerType() || ArrType->isPipeType() || 2326 ArrType->isSamplerT() || ArrType->isImageType()) { 2327 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType; 2328 return QualType(); 2329 } 2330 } 2331 2332 return T; 2333 } 2334 2335 QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr, 2336 SourceLocation AttrLoc) { 2337 // The base type must be integer (not Boolean or enumeration) or float, and 2338 // can't already be a vector. 2339 if (!CurType->isDependentType() && 2340 (!CurType->isBuiltinType() || CurType->isBooleanType() || 2341 (!CurType->isIntegerType() && !CurType->isRealFloatingType()))) { 2342 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType; 2343 return QualType(); 2344 } 2345 2346 if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent()) 2347 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc, 2348 VectorType::GenericVector); 2349 2350 llvm::APSInt VecSize(32); 2351 if (!SizeExpr->isIntegerConstantExpr(VecSize, Context)) { 2352 Diag(AttrLoc, diag::err_attribute_argument_type) 2353 << "vector_size" << AANT_ArgumentIntegerConstant 2354 << SizeExpr->getSourceRange(); 2355 return QualType(); 2356 } 2357 2358 if (CurType->isDependentType()) 2359 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc, 2360 VectorType::GenericVector); 2361 2362 unsigned VectorSize = static_cast<unsigned>(VecSize.getZExtValue() * 8); 2363 unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType)); 2364 2365 if (VectorSize == 0) { 2366 Diag(AttrLoc, diag::err_attribute_zero_size) << SizeExpr->getSourceRange(); 2367 return QualType(); 2368 } 2369 2370 // vecSize is specified in bytes - convert to bits. 2371 if (VectorSize % TypeSize) { 2372 Diag(AttrLoc, diag::err_attribute_invalid_size) 2373 << SizeExpr->getSourceRange(); 2374 return QualType(); 2375 } 2376 2377 if (VectorType::isVectorSizeTooLarge(VectorSize / TypeSize)) { 2378 Diag(AttrLoc, diag::err_attribute_size_too_large) 2379 << SizeExpr->getSourceRange(); 2380 return QualType(); 2381 } 2382 2383 return Context.getVectorType(CurType, VectorSize / TypeSize, 2384 VectorType::GenericVector); 2385 } 2386 2387 /// Build an ext-vector type. 2388 /// 2389 /// Run the required checks for the extended vector type. 2390 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 2391 SourceLocation AttrLoc) { 2392 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined 2393 // in conjunction with complex types (pointers, arrays, functions, etc.). 2394 // 2395 // Additionally, OpenCL prohibits vectors of booleans (they're considered a 2396 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects 2397 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors 2398 // of bool aren't allowed. 2399 if ((!T->isDependentType() && !T->isIntegerType() && 2400 !T->isRealFloatingType()) || 2401 T->isBooleanType()) { 2402 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 2403 return QualType(); 2404 } 2405 2406 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 2407 llvm::APSInt vecSize(32); 2408 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 2409 Diag(AttrLoc, diag::err_attribute_argument_type) 2410 << "ext_vector_type" << AANT_ArgumentIntegerConstant 2411 << ArraySize->getSourceRange(); 2412 return QualType(); 2413 } 2414 2415 // Unlike gcc's vector_size attribute, the size is specified as the 2416 // number of elements, not the number of bytes. 2417 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 2418 2419 if (vectorSize == 0) { 2420 Diag(AttrLoc, diag::err_attribute_zero_size) 2421 << ArraySize->getSourceRange(); 2422 return QualType(); 2423 } 2424 2425 if (VectorType::isVectorSizeTooLarge(vectorSize)) { 2426 Diag(AttrLoc, diag::err_attribute_size_too_large) 2427 << ArraySize->getSourceRange(); 2428 return QualType(); 2429 } 2430 2431 return Context.getExtVectorType(T, vectorSize); 2432 } 2433 2434 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 2435 } 2436 2437 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) { 2438 if (T->isArrayType() || T->isFunctionType()) { 2439 Diag(Loc, diag::err_func_returning_array_function) 2440 << T->isFunctionType() << T; 2441 return true; 2442 } 2443 2444 // Functions cannot return half FP. 2445 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) { 2446 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 2447 FixItHint::CreateInsertion(Loc, "*"); 2448 return true; 2449 } 2450 2451 // Methods cannot return interface types. All ObjC objects are 2452 // passed by reference. 2453 if (T->isObjCObjectType()) { 2454 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) 2455 << 0 << T << FixItHint::CreateInsertion(Loc, "*"); 2456 return true; 2457 } 2458 2459 if (T.hasNonTrivialToPrimitiveDestructCUnion() || 2460 T.hasNonTrivialToPrimitiveCopyCUnion()) 2461 checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn, 2462 NTCUK_Destruct|NTCUK_Copy); 2463 2464 return false; 2465 } 2466 2467 /// Check the extended parameter information. Most of the necessary 2468 /// checking should occur when applying the parameter attribute; the 2469 /// only other checks required are positional restrictions. 2470 static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes, 2471 const FunctionProtoType::ExtProtoInfo &EPI, 2472 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) { 2473 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos"); 2474 2475 bool hasCheckedSwiftCall = false; 2476 auto checkForSwiftCC = [&](unsigned paramIndex) { 2477 // Only do this once. 2478 if (hasCheckedSwiftCall) return; 2479 hasCheckedSwiftCall = true; 2480 if (EPI.ExtInfo.getCC() == CC_Swift) return; 2481 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall) 2482 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI()); 2483 }; 2484 2485 for (size_t paramIndex = 0, numParams = paramTypes.size(); 2486 paramIndex != numParams; ++paramIndex) { 2487 switch (EPI.ExtParameterInfos[paramIndex].getABI()) { 2488 // Nothing interesting to check for orindary-ABI parameters. 2489 case ParameterABI::Ordinary: 2490 continue; 2491 2492 // swift_indirect_result parameters must be a prefix of the function 2493 // arguments. 2494 case ParameterABI::SwiftIndirectResult: 2495 checkForSwiftCC(paramIndex); 2496 if (paramIndex != 0 && 2497 EPI.ExtParameterInfos[paramIndex - 1].getABI() 2498 != ParameterABI::SwiftIndirectResult) { 2499 S.Diag(getParamLoc(paramIndex), 2500 diag::err_swift_indirect_result_not_first); 2501 } 2502 continue; 2503 2504 case ParameterABI::SwiftContext: 2505 checkForSwiftCC(paramIndex); 2506 continue; 2507 2508 // swift_error parameters must be preceded by a swift_context parameter. 2509 case ParameterABI::SwiftErrorResult: 2510 checkForSwiftCC(paramIndex); 2511 if (paramIndex == 0 || 2512 EPI.ExtParameterInfos[paramIndex - 1].getABI() != 2513 ParameterABI::SwiftContext) { 2514 S.Diag(getParamLoc(paramIndex), 2515 diag::err_swift_error_result_not_after_swift_context); 2516 } 2517 continue; 2518 } 2519 llvm_unreachable("bad ABI kind"); 2520 } 2521 } 2522 2523 QualType Sema::BuildFunctionType(QualType T, 2524 MutableArrayRef<QualType> ParamTypes, 2525 SourceLocation Loc, DeclarationName Entity, 2526 const FunctionProtoType::ExtProtoInfo &EPI) { 2527 bool Invalid = false; 2528 2529 Invalid |= CheckFunctionReturnType(T, Loc); 2530 2531 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { 2532 // FIXME: Loc is too inprecise here, should use proper locations for args. 2533 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 2534 if (ParamType->isVoidType()) { 2535 Diag(Loc, diag::err_param_with_void_type); 2536 Invalid = true; 2537 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) { 2538 // Disallow half FP arguments. 2539 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 2540 FixItHint::CreateInsertion(Loc, "*"); 2541 Invalid = true; 2542 } 2543 2544 ParamTypes[Idx] = ParamType; 2545 } 2546 2547 if (EPI.ExtParameterInfos) { 2548 checkExtParameterInfos(*this, ParamTypes, EPI, 2549 [=](unsigned i) { return Loc; }); 2550 } 2551 2552 if (EPI.ExtInfo.getProducesResult()) { 2553 // This is just a warning, so we can't fail to build if we see it. 2554 checkNSReturnsRetainedReturnType(Loc, T); 2555 } 2556 2557 if (Invalid) 2558 return QualType(); 2559 2560 return Context.getFunctionType(T, ParamTypes, EPI); 2561 } 2562 2563 /// Build a member pointer type \c T Class::*. 2564 /// 2565 /// \param T the type to which the member pointer refers. 2566 /// \param Class the class type into which the member pointer points. 2567 /// \param Loc the location where this type begins 2568 /// \param Entity the name of the entity that will have this member pointer type 2569 /// 2570 /// \returns a member pointer type, if successful, or a NULL type if there was 2571 /// an error. 2572 QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 2573 SourceLocation Loc, 2574 DeclarationName Entity) { 2575 // Verify that we're not building a pointer to pointer to function with 2576 // exception specification. 2577 if (CheckDistantExceptionSpec(T)) { 2578 Diag(Loc, diag::err_distant_exception_spec); 2579 return QualType(); 2580 } 2581 2582 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 2583 // with reference type, or "cv void." 2584 if (T->isReferenceType()) { 2585 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 2586 << getPrintableNameForEntity(Entity) << T; 2587 return QualType(); 2588 } 2589 2590 if (T->isVoidType()) { 2591 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 2592 << getPrintableNameForEntity(Entity); 2593 return QualType(); 2594 } 2595 2596 if (!Class->isDependentType() && !Class->isRecordType()) { 2597 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 2598 return QualType(); 2599 } 2600 2601 // Adjust the default free function calling convention to the default method 2602 // calling convention. 2603 bool IsCtorOrDtor = 2604 (Entity.getNameKind() == DeclarationName::CXXConstructorName) || 2605 (Entity.getNameKind() == DeclarationName::CXXDestructorName); 2606 if (T->isFunctionType()) 2607 adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc); 2608 2609 return Context.getMemberPointerType(T, Class.getTypePtr()); 2610 } 2611 2612 /// Build a block pointer type. 2613 /// 2614 /// \param T The type to which we'll be building a block pointer. 2615 /// 2616 /// \param Loc The source location, used for diagnostics. 2617 /// 2618 /// \param Entity The name of the entity that involves the block pointer 2619 /// type, if known. 2620 /// 2621 /// \returns A suitable block pointer type, if there are no 2622 /// errors. Otherwise, returns a NULL type. 2623 QualType Sema::BuildBlockPointerType(QualType T, 2624 SourceLocation Loc, 2625 DeclarationName Entity) { 2626 if (!T->isFunctionType()) { 2627 Diag(Loc, diag::err_nonfunction_block_type); 2628 return QualType(); 2629 } 2630 2631 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer)) 2632 return QualType(); 2633 2634 return Context.getBlockPointerType(T); 2635 } 2636 2637 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 2638 QualType QT = Ty.get(); 2639 if (QT.isNull()) { 2640 if (TInfo) *TInfo = nullptr; 2641 return QualType(); 2642 } 2643 2644 TypeSourceInfo *DI = nullptr; 2645 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 2646 QT = LIT->getType(); 2647 DI = LIT->getTypeSourceInfo(); 2648 } 2649 2650 if (TInfo) *TInfo = DI; 2651 return QT; 2652 } 2653 2654 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2655 Qualifiers::ObjCLifetime ownership, 2656 unsigned chunkIndex); 2657 2658 /// Given that this is the declaration of a parameter under ARC, 2659 /// attempt to infer attributes and such for pointer-to-whatever 2660 /// types. 2661 static void inferARCWriteback(TypeProcessingState &state, 2662 QualType &declSpecType) { 2663 Sema &S = state.getSema(); 2664 Declarator &declarator = state.getDeclarator(); 2665 2666 // TODO: should we care about decl qualifiers? 2667 2668 // Check whether the declarator has the expected form. We walk 2669 // from the inside out in order to make the block logic work. 2670 unsigned outermostPointerIndex = 0; 2671 bool isBlockPointer = false; 2672 unsigned numPointers = 0; 2673 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 2674 unsigned chunkIndex = i; 2675 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 2676 switch (chunk.Kind) { 2677 case DeclaratorChunk::Paren: 2678 // Ignore parens. 2679 break; 2680 2681 case DeclaratorChunk::Reference: 2682 case DeclaratorChunk::Pointer: 2683 // Count the number of pointers. Treat references 2684 // interchangeably as pointers; if they're mis-ordered, normal 2685 // type building will discover that. 2686 outermostPointerIndex = chunkIndex; 2687 numPointers++; 2688 break; 2689 2690 case DeclaratorChunk::BlockPointer: 2691 // If we have a pointer to block pointer, that's an acceptable 2692 // indirect reference; anything else is not an application of 2693 // the rules. 2694 if (numPointers != 1) return; 2695 numPointers++; 2696 outermostPointerIndex = chunkIndex; 2697 isBlockPointer = true; 2698 2699 // We don't care about pointer structure in return values here. 2700 goto done; 2701 2702 case DeclaratorChunk::Array: // suppress if written (id[])? 2703 case DeclaratorChunk::Function: 2704 case DeclaratorChunk::MemberPointer: 2705 case DeclaratorChunk::Pipe: 2706 return; 2707 } 2708 } 2709 done: 2710 2711 // If we have *one* pointer, then we want to throw the qualifier on 2712 // the declaration-specifiers, which means that it needs to be a 2713 // retainable object type. 2714 if (numPointers == 1) { 2715 // If it's not a retainable object type, the rule doesn't apply. 2716 if (!declSpecType->isObjCRetainableType()) return; 2717 2718 // If it already has lifetime, don't do anything. 2719 if (declSpecType.getObjCLifetime()) return; 2720 2721 // Otherwise, modify the type in-place. 2722 Qualifiers qs; 2723 2724 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 2725 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 2726 else 2727 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 2728 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 2729 2730 // If we have *two* pointers, then we want to throw the qualifier on 2731 // the outermost pointer. 2732 } else if (numPointers == 2) { 2733 // If we don't have a block pointer, we need to check whether the 2734 // declaration-specifiers gave us something that will turn into a 2735 // retainable object pointer after we slap the first pointer on it. 2736 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 2737 return; 2738 2739 // Look for an explicit lifetime attribute there. 2740 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 2741 if (chunk.Kind != DeclaratorChunk::Pointer && 2742 chunk.Kind != DeclaratorChunk::BlockPointer) 2743 return; 2744 for (const ParsedAttr &AL : chunk.getAttrs()) 2745 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) 2746 return; 2747 2748 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 2749 outermostPointerIndex); 2750 2751 // Any other number of pointers/references does not trigger the rule. 2752 } else return; 2753 2754 // TODO: mark whether we did this inference? 2755 } 2756 2757 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals, 2758 SourceLocation FallbackLoc, 2759 SourceLocation ConstQualLoc, 2760 SourceLocation VolatileQualLoc, 2761 SourceLocation RestrictQualLoc, 2762 SourceLocation AtomicQualLoc, 2763 SourceLocation UnalignedQualLoc) { 2764 if (!Quals) 2765 return; 2766 2767 struct Qual { 2768 const char *Name; 2769 unsigned Mask; 2770 SourceLocation Loc; 2771 } const QualKinds[5] = { 2772 { "const", DeclSpec::TQ_const, ConstQualLoc }, 2773 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc }, 2774 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc }, 2775 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc }, 2776 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc } 2777 }; 2778 2779 SmallString<32> QualStr; 2780 unsigned NumQuals = 0; 2781 SourceLocation Loc; 2782 FixItHint FixIts[5]; 2783 2784 // Build a string naming the redundant qualifiers. 2785 for (auto &E : QualKinds) { 2786 if (Quals & E.Mask) { 2787 if (!QualStr.empty()) QualStr += ' '; 2788 QualStr += E.Name; 2789 2790 // If we have a location for the qualifier, offer a fixit. 2791 SourceLocation QualLoc = E.Loc; 2792 if (QualLoc.isValid()) { 2793 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); 2794 if (Loc.isInvalid() || 2795 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc)) 2796 Loc = QualLoc; 2797 } 2798 2799 ++NumQuals; 2800 } 2801 } 2802 2803 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID) 2804 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; 2805 } 2806 2807 // Diagnose pointless type qualifiers on the return type of a function. 2808 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy, 2809 Declarator &D, 2810 unsigned FunctionChunkIndex) { 2811 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { 2812 // FIXME: TypeSourceInfo doesn't preserve location information for 2813 // qualifiers. 2814 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, 2815 RetTy.getLocalCVRQualifiers(), 2816 D.getIdentifierLoc()); 2817 return; 2818 } 2819 2820 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1, 2821 End = D.getNumTypeObjects(); 2822 OuterChunkIndex != End; ++OuterChunkIndex) { 2823 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex); 2824 switch (OuterChunk.Kind) { 2825 case DeclaratorChunk::Paren: 2826 continue; 2827 2828 case DeclaratorChunk::Pointer: { 2829 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr; 2830 S.diagnoseIgnoredQualifiers( 2831 diag::warn_qual_return_type, 2832 PTI.TypeQuals, 2833 SourceLocation(), 2834 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2835 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2836 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2837 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc), 2838 SourceLocation::getFromRawEncoding(PTI.UnalignedQualLoc)); 2839 return; 2840 } 2841 2842 case DeclaratorChunk::Function: 2843 case DeclaratorChunk::BlockPointer: 2844 case DeclaratorChunk::Reference: 2845 case DeclaratorChunk::Array: 2846 case DeclaratorChunk::MemberPointer: 2847 case DeclaratorChunk::Pipe: 2848 // FIXME: We can't currently provide an accurate source location and a 2849 // fix-it hint for these. 2850 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0; 2851 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, 2852 RetTy.getCVRQualifiers() | AtomicQual, 2853 D.getIdentifierLoc()); 2854 return; 2855 } 2856 2857 llvm_unreachable("unknown declarator chunk kind"); 2858 } 2859 2860 // If the qualifiers come from a conversion function type, don't diagnose 2861 // them -- they're not necessarily redundant, since such a conversion 2862 // operator can be explicitly called as "x.operator const int()". 2863 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId) 2864 return; 2865 2866 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers 2867 // which are present there. 2868 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, 2869 D.getDeclSpec().getTypeQualifiers(), 2870 D.getIdentifierLoc(), 2871 D.getDeclSpec().getConstSpecLoc(), 2872 D.getDeclSpec().getVolatileSpecLoc(), 2873 D.getDeclSpec().getRestrictSpecLoc(), 2874 D.getDeclSpec().getAtomicSpecLoc(), 2875 D.getDeclSpec().getUnalignedSpecLoc()); 2876 } 2877 2878 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 2879 TypeSourceInfo *&ReturnTypeInfo) { 2880 Sema &SemaRef = state.getSema(); 2881 Declarator &D = state.getDeclarator(); 2882 QualType T; 2883 ReturnTypeInfo = nullptr; 2884 2885 // The TagDecl owned by the DeclSpec. 2886 TagDecl *OwnedTagDecl = nullptr; 2887 2888 switch (D.getName().getKind()) { 2889 case UnqualifiedIdKind::IK_ImplicitSelfParam: 2890 case UnqualifiedIdKind::IK_OperatorFunctionId: 2891 case UnqualifiedIdKind::IK_Identifier: 2892 case UnqualifiedIdKind::IK_LiteralOperatorId: 2893 case UnqualifiedIdKind::IK_TemplateId: 2894 T = ConvertDeclSpecToType(state); 2895 2896 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 2897 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2898 // Owned declaration is embedded in declarator. 2899 OwnedTagDecl->setEmbeddedInDeclarator(true); 2900 } 2901 break; 2902 2903 case UnqualifiedIdKind::IK_ConstructorName: 2904 case UnqualifiedIdKind::IK_ConstructorTemplateId: 2905 case UnqualifiedIdKind::IK_DestructorName: 2906 // Constructors and destructors don't have return types. Use 2907 // "void" instead. 2908 T = SemaRef.Context.VoidTy; 2909 processTypeAttrs(state, T, TAL_DeclSpec, 2910 D.getMutableDeclSpec().getAttributes()); 2911 break; 2912 2913 case UnqualifiedIdKind::IK_DeductionGuideName: 2914 // Deduction guides have a trailing return type and no type in their 2915 // decl-specifier sequence. Use a placeholder return type for now. 2916 T = SemaRef.Context.DependentTy; 2917 break; 2918 2919 case UnqualifiedIdKind::IK_ConversionFunctionId: 2920 // The result type of a conversion function is the type that it 2921 // converts to. 2922 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 2923 &ReturnTypeInfo); 2924 break; 2925 } 2926 2927 if (!D.getAttributes().empty()) 2928 distributeTypeAttrsFromDeclarator(state, T); 2929 2930 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 2931 if (DeducedType *Deduced = T->getContainedDeducedType()) { 2932 AutoType *Auto = dyn_cast<AutoType>(Deduced); 2933 int Error = -1; 2934 2935 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or 2936 // class template argument deduction)? 2937 bool IsCXXAutoType = 2938 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType); 2939 bool IsDeducedReturnType = false; 2940 2941 switch (D.getContext()) { 2942 case DeclaratorContext::LambdaExprContext: 2943 // Declared return type of a lambda-declarator is implicit and is always 2944 // 'auto'. 2945 break; 2946 case DeclaratorContext::ObjCParameterContext: 2947 case DeclaratorContext::ObjCResultContext: 2948 case DeclaratorContext::PrototypeContext: 2949 Error = 0; 2950 break; 2951 case DeclaratorContext::LambdaExprParameterContext: 2952 // In C++14, generic lambdas allow 'auto' in their parameters. 2953 if (!SemaRef.getLangOpts().CPlusPlus14 || 2954 !Auto || Auto->getKeyword() != AutoTypeKeyword::Auto) 2955 Error = 16; 2956 else { 2957 // If auto is mentioned in a lambda parameter context, convert it to a 2958 // template parameter type. 2959 sema::LambdaScopeInfo *LSI = SemaRef.getCurLambda(); 2960 assert(LSI && "No LambdaScopeInfo on the stack!"); 2961 const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth; 2962 const unsigned AutoParameterPosition = LSI->TemplateParams.size(); 2963 const bool IsParameterPack = D.hasEllipsis(); 2964 2965 // Create the TemplateTypeParmDecl here to retrieve the corresponding 2966 // template parameter type. Template parameters are temporarily added 2967 // to the TU until the associated TemplateDecl is created. 2968 TemplateTypeParmDecl *CorrespondingTemplateParam = 2969 TemplateTypeParmDecl::Create( 2970 SemaRef.Context, SemaRef.Context.getTranslationUnitDecl(), 2971 /*KeyLoc*/ SourceLocation(), /*NameLoc*/ D.getBeginLoc(), 2972 TemplateParameterDepth, AutoParameterPosition, 2973 /*Identifier*/ nullptr, false, IsParameterPack); 2974 CorrespondingTemplateParam->setImplicit(); 2975 LSI->TemplateParams.push_back(CorrespondingTemplateParam); 2976 // Replace the 'auto' in the function parameter with this invented 2977 // template type parameter. 2978 // FIXME: Retain some type sugar to indicate that this was written 2979 // as 'auto'. 2980 T = state.ReplaceAutoType( 2981 T, QualType(CorrespondingTemplateParam->getTypeForDecl(), 0)); 2982 } 2983 break; 2984 case DeclaratorContext::MemberContext: { 2985 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static || 2986 D.isFunctionDeclarator()) 2987 break; 2988 bool Cxx = SemaRef.getLangOpts().CPlusPlus; 2989 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2990 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2991 case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break; 2992 case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break; 2993 case TTK_Class: Error = 5; /* Class member */ break; 2994 case TTK_Interface: Error = 6; /* Interface member */ break; 2995 } 2996 if (D.getDeclSpec().isFriendSpecified()) 2997 Error = 20; // Friend type 2998 break; 2999 } 3000 case DeclaratorContext::CXXCatchContext: 3001 case DeclaratorContext::ObjCCatchContext: 3002 Error = 7; // Exception declaration 3003 break; 3004 case DeclaratorContext::TemplateParamContext: 3005 if (isa<DeducedTemplateSpecializationType>(Deduced)) 3006 Error = 19; // Template parameter 3007 else if (!SemaRef.getLangOpts().CPlusPlus17) 3008 Error = 8; // Template parameter (until C++17) 3009 break; 3010 case DeclaratorContext::BlockLiteralContext: 3011 Error = 9; // Block literal 3012 break; 3013 case DeclaratorContext::TemplateArgContext: 3014 // Within a template argument list, a deduced template specialization 3015 // type will be reinterpreted as a template template argument. 3016 if (isa<DeducedTemplateSpecializationType>(Deduced) && 3017 !D.getNumTypeObjects() && 3018 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier) 3019 break; 3020 LLVM_FALLTHROUGH; 3021 case DeclaratorContext::TemplateTypeArgContext: 3022 Error = 10; // Template type argument 3023 break; 3024 case DeclaratorContext::AliasDeclContext: 3025 case DeclaratorContext::AliasTemplateContext: 3026 Error = 12; // Type alias 3027 break; 3028 case DeclaratorContext::TrailingReturnContext: 3029 case DeclaratorContext::TrailingReturnVarContext: 3030 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType) 3031 Error = 13; // Function return type 3032 IsDeducedReturnType = true; 3033 break; 3034 case DeclaratorContext::ConversionIdContext: 3035 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType) 3036 Error = 14; // conversion-type-id 3037 IsDeducedReturnType = true; 3038 break; 3039 case DeclaratorContext::FunctionalCastContext: 3040 if (isa<DeducedTemplateSpecializationType>(Deduced)) 3041 break; 3042 LLVM_FALLTHROUGH; 3043 case DeclaratorContext::TypeNameContext: 3044 Error = 15; // Generic 3045 break; 3046 case DeclaratorContext::FileContext: 3047 case DeclaratorContext::BlockContext: 3048 case DeclaratorContext::ForContext: 3049 case DeclaratorContext::InitStmtContext: 3050 case DeclaratorContext::ConditionContext: 3051 // FIXME: P0091R3 (erroneously) does not permit class template argument 3052 // deduction in conditions, for-init-statements, and other declarations 3053 // that are not simple-declarations. 3054 break; 3055 case DeclaratorContext::CXXNewContext: 3056 // FIXME: P0091R3 does not permit class template argument deduction here, 3057 // but we follow GCC and allow it anyway. 3058 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced)) 3059 Error = 17; // 'new' type 3060 break; 3061 case DeclaratorContext::KNRTypeListContext: 3062 Error = 18; // K&R function parameter 3063 break; 3064 } 3065 3066 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3067 Error = 11; 3068 3069 // In Objective-C it is an error to use 'auto' on a function declarator 3070 // (and everywhere for '__auto_type'). 3071 if (D.isFunctionDeclarator() && 3072 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType)) 3073 Error = 13; 3074 3075 bool HaveTrailing = false; 3076 3077 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 3078 // contains a trailing return type. That is only legal at the outermost 3079 // level. Check all declarator chunks (outermost first) anyway, to give 3080 // better diagnostics. 3081 // We don't support '__auto_type' with trailing return types. 3082 // FIXME: Should we only do this for 'auto' and not 'decltype(auto)'? 3083 if (SemaRef.getLangOpts().CPlusPlus11 && IsCXXAutoType && 3084 D.hasTrailingReturnType()) { 3085 HaveTrailing = true; 3086 Error = -1; 3087 } 3088 3089 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc(); 3090 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId) 3091 AutoRange = D.getName().getSourceRange(); 3092 3093 if (Error != -1) { 3094 unsigned Kind; 3095 if (Auto) { 3096 switch (Auto->getKeyword()) { 3097 case AutoTypeKeyword::Auto: Kind = 0; break; 3098 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break; 3099 case AutoTypeKeyword::GNUAutoType: Kind = 2; break; 3100 } 3101 } else { 3102 assert(isa<DeducedTemplateSpecializationType>(Deduced) && 3103 "unknown auto type"); 3104 Kind = 3; 3105 } 3106 3107 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced); 3108 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName(); 3109 3110 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed) 3111 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN) 3112 << QualType(Deduced, 0) << AutoRange; 3113 if (auto *TD = TN.getAsTemplateDecl()) 3114 SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here); 3115 3116 T = SemaRef.Context.IntTy; 3117 D.setInvalidType(true); 3118 } else if (!HaveTrailing && 3119 D.getContext() != DeclaratorContext::LambdaExprContext) { 3120 // If there was a trailing return type, we already got 3121 // warn_cxx98_compat_trailing_return_type in the parser. 3122 SemaRef.Diag(AutoRange.getBegin(), 3123 D.getContext() == 3124 DeclaratorContext::LambdaExprParameterContext 3125 ? diag::warn_cxx11_compat_generic_lambda 3126 : IsDeducedReturnType 3127 ? diag::warn_cxx11_compat_deduced_return_type 3128 : diag::warn_cxx98_compat_auto_type_specifier) 3129 << AutoRange; 3130 } 3131 } 3132 3133 if (SemaRef.getLangOpts().CPlusPlus && 3134 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 3135 // Check the contexts where C++ forbids the declaration of a new class 3136 // or enumeration in a type-specifier-seq. 3137 unsigned DiagID = 0; 3138 switch (D.getContext()) { 3139 case DeclaratorContext::TrailingReturnContext: 3140 case DeclaratorContext::TrailingReturnVarContext: 3141 // Class and enumeration definitions are syntactically not allowed in 3142 // trailing return types. 3143 llvm_unreachable("parser should not have allowed this"); 3144 break; 3145 case DeclaratorContext::FileContext: 3146 case DeclaratorContext::MemberContext: 3147 case DeclaratorContext::BlockContext: 3148 case DeclaratorContext::ForContext: 3149 case DeclaratorContext::InitStmtContext: 3150 case DeclaratorContext::BlockLiteralContext: 3151 case DeclaratorContext::LambdaExprContext: 3152 // C++11 [dcl.type]p3: 3153 // A type-specifier-seq shall not define a class or enumeration unless 3154 // it appears in the type-id of an alias-declaration (7.1.3) that is not 3155 // the declaration of a template-declaration. 3156 case DeclaratorContext::AliasDeclContext: 3157 break; 3158 case DeclaratorContext::AliasTemplateContext: 3159 DiagID = diag::err_type_defined_in_alias_template; 3160 break; 3161 case DeclaratorContext::TypeNameContext: 3162 case DeclaratorContext::FunctionalCastContext: 3163 case DeclaratorContext::ConversionIdContext: 3164 case DeclaratorContext::TemplateParamContext: 3165 case DeclaratorContext::CXXNewContext: 3166 case DeclaratorContext::CXXCatchContext: 3167 case DeclaratorContext::ObjCCatchContext: 3168 case DeclaratorContext::TemplateArgContext: 3169 case DeclaratorContext::TemplateTypeArgContext: 3170 DiagID = diag::err_type_defined_in_type_specifier; 3171 break; 3172 case DeclaratorContext::PrototypeContext: 3173 case DeclaratorContext::LambdaExprParameterContext: 3174 case DeclaratorContext::ObjCParameterContext: 3175 case DeclaratorContext::ObjCResultContext: 3176 case DeclaratorContext::KNRTypeListContext: 3177 // C++ [dcl.fct]p6: 3178 // Types shall not be defined in return or parameter types. 3179 DiagID = diag::err_type_defined_in_param_type; 3180 break; 3181 case DeclaratorContext::ConditionContext: 3182 // C++ 6.4p2: 3183 // The type-specifier-seq shall not contain typedef and shall not declare 3184 // a new class or enumeration. 3185 DiagID = diag::err_type_defined_in_condition; 3186 break; 3187 } 3188 3189 if (DiagID != 0) { 3190 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID) 3191 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 3192 D.setInvalidType(true); 3193 } 3194 } 3195 3196 assert(!T.isNull() && "This function should not return a null type"); 3197 return T; 3198 } 3199 3200 /// Produce an appropriate diagnostic for an ambiguity between a function 3201 /// declarator and a C++ direct-initializer. 3202 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 3203 DeclaratorChunk &DeclType, QualType RT) { 3204 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 3205 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 3206 3207 // If the return type is void there is no ambiguity. 3208 if (RT->isVoidType()) 3209 return; 3210 3211 // An initializer for a non-class type can have at most one argument. 3212 if (!RT->isRecordType() && FTI.NumParams > 1) 3213 return; 3214 3215 // An initializer for a reference must have exactly one argument. 3216 if (RT->isReferenceType() && FTI.NumParams != 1) 3217 return; 3218 3219 // Only warn if this declarator is declaring a function at block scope, and 3220 // doesn't have a storage class (such as 'extern') specified. 3221 if (!D.isFunctionDeclarator() || 3222 D.getFunctionDefinitionKind() != FDK_Declaration || 3223 !S.CurContext->isFunctionOrMethod() || 3224 D.getDeclSpec().getStorageClassSpec() 3225 != DeclSpec::SCS_unspecified) 3226 return; 3227 3228 // Inside a condition, a direct initializer is not permitted. We allow one to 3229 // be parsed in order to give better diagnostics in condition parsing. 3230 if (D.getContext() == DeclaratorContext::ConditionContext) 3231 return; 3232 3233 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 3234 3235 S.Diag(DeclType.Loc, 3236 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration 3237 : diag::warn_empty_parens_are_function_decl) 3238 << ParenRange; 3239 3240 // If the declaration looks like: 3241 // T var1, 3242 // f(); 3243 // and name lookup finds a function named 'f', then the ',' was 3244 // probably intended to be a ';'. 3245 if (!D.isFirstDeclarator() && D.getIdentifier()) { 3246 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 3247 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 3248 if (Comma.getFileID() != Name.getFileID() || 3249 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 3250 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 3251 Sema::LookupOrdinaryName); 3252 if (S.LookupName(Result, S.getCurScope())) 3253 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 3254 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 3255 << D.getIdentifier(); 3256 Result.suppressDiagnostics(); 3257 } 3258 } 3259 3260 if (FTI.NumParams > 0) { 3261 // For a declaration with parameters, eg. "T var(T());", suggest adding 3262 // parens around the first parameter to turn the declaration into a 3263 // variable declaration. 3264 SourceRange Range = FTI.Params[0].Param->getSourceRange(); 3265 SourceLocation B = Range.getBegin(); 3266 SourceLocation E = S.getLocForEndOfToken(Range.getEnd()); 3267 // FIXME: Maybe we should suggest adding braces instead of parens 3268 // in C++11 for classes that don't have an initializer_list constructor. 3269 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 3270 << FixItHint::CreateInsertion(B, "(") 3271 << FixItHint::CreateInsertion(E, ")"); 3272 } else { 3273 // For a declaration without parameters, eg. "T var();", suggest replacing 3274 // the parens with an initializer to turn the declaration into a variable 3275 // declaration. 3276 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 3277 3278 // Empty parens mean value-initialization, and no parens mean 3279 // default initialization. These are equivalent if the default 3280 // constructor is user-provided or if zero-initialization is a 3281 // no-op. 3282 if (RD && RD->hasDefinition() && 3283 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 3284 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 3285 << FixItHint::CreateRemoval(ParenRange); 3286 else { 3287 std::string Init = 3288 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin()); 3289 if (Init.empty() && S.LangOpts.CPlusPlus11) 3290 Init = "{}"; 3291 if (!Init.empty()) 3292 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 3293 << FixItHint::CreateReplacement(ParenRange, Init); 3294 } 3295 } 3296 } 3297 3298 /// Produce an appropriate diagnostic for a declarator with top-level 3299 /// parentheses. 3300 static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) { 3301 DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1); 3302 assert(Paren.Kind == DeclaratorChunk::Paren && 3303 "do not have redundant top-level parentheses"); 3304 3305 // This is a syntactic check; we're not interested in cases that arise 3306 // during template instantiation. 3307 if (S.inTemplateInstantiation()) 3308 return; 3309 3310 // Check whether this could be intended to be a construction of a temporary 3311 // object in C++ via a function-style cast. 3312 bool CouldBeTemporaryObject = 3313 S.getLangOpts().CPlusPlus && D.isExpressionContext() && 3314 !D.isInvalidType() && D.getIdentifier() && 3315 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier && 3316 (T->isRecordType() || T->isDependentType()) && 3317 D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator(); 3318 3319 bool StartsWithDeclaratorId = true; 3320 for (auto &C : D.type_objects()) { 3321 switch (C.Kind) { 3322 case DeclaratorChunk::Paren: 3323 if (&C == &Paren) 3324 continue; 3325 LLVM_FALLTHROUGH; 3326 case DeclaratorChunk::Pointer: 3327 StartsWithDeclaratorId = false; 3328 continue; 3329 3330 case DeclaratorChunk::Array: 3331 if (!C.Arr.NumElts) 3332 CouldBeTemporaryObject = false; 3333 continue; 3334 3335 case DeclaratorChunk::Reference: 3336 // FIXME: Suppress the warning here if there is no initializer; we're 3337 // going to give an error anyway. 3338 // We assume that something like 'T (&x) = y;' is highly likely to not 3339 // be intended to be a temporary object. 3340 CouldBeTemporaryObject = false; 3341 StartsWithDeclaratorId = false; 3342 continue; 3343 3344 case DeclaratorChunk::Function: 3345 // In a new-type-id, function chunks require parentheses. 3346 if (D.getContext() == DeclaratorContext::CXXNewContext) 3347 return; 3348 // FIXME: "A(f())" deserves a vexing-parse warning, not just a 3349 // redundant-parens warning, but we don't know whether the function 3350 // chunk was syntactically valid as an expression here. 3351 CouldBeTemporaryObject = false; 3352 continue; 3353 3354 case DeclaratorChunk::BlockPointer: 3355 case DeclaratorChunk::MemberPointer: 3356 case DeclaratorChunk::Pipe: 3357 // These cannot appear in expressions. 3358 CouldBeTemporaryObject = false; 3359 StartsWithDeclaratorId = false; 3360 continue; 3361 } 3362 } 3363 3364 // FIXME: If there is an initializer, assume that this is not intended to be 3365 // a construction of a temporary object. 3366 3367 // Check whether the name has already been declared; if not, this is not a 3368 // function-style cast. 3369 if (CouldBeTemporaryObject) { 3370 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 3371 Sema::LookupOrdinaryName); 3372 if (!S.LookupName(Result, S.getCurScope())) 3373 CouldBeTemporaryObject = false; 3374 Result.suppressDiagnostics(); 3375 } 3376 3377 SourceRange ParenRange(Paren.Loc, Paren.EndLoc); 3378 3379 if (!CouldBeTemporaryObject) { 3380 // If we have A (::B), the parentheses affect the meaning of the program. 3381 // Suppress the warning in that case. Don't bother looking at the DeclSpec 3382 // here: even (e.g.) "int ::x" is visually ambiguous even though it's 3383 // formally unambiguous. 3384 if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) { 3385 for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS; 3386 NNS = NNS->getPrefix()) { 3387 if (NNS->getKind() == NestedNameSpecifier::Global) 3388 return; 3389 } 3390 } 3391 3392 S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator) 3393 << ParenRange << FixItHint::CreateRemoval(Paren.Loc) 3394 << FixItHint::CreateRemoval(Paren.EndLoc); 3395 return; 3396 } 3397 3398 S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration) 3399 << ParenRange << D.getIdentifier(); 3400 auto *RD = T->getAsCXXRecordDecl(); 3401 if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor()) 3402 S.Diag(Paren.Loc, diag::note_raii_guard_add_name) 3403 << FixItHint::CreateInsertion(Paren.Loc, " varname") << T 3404 << D.getIdentifier(); 3405 // FIXME: A cast to void is probably a better suggestion in cases where it's 3406 // valid (when there is no initializer and we're not in a condition). 3407 S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses) 3408 << FixItHint::CreateInsertion(D.getBeginLoc(), "(") 3409 << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")"); 3410 S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration) 3411 << FixItHint::CreateRemoval(Paren.Loc) 3412 << FixItHint::CreateRemoval(Paren.EndLoc); 3413 } 3414 3415 /// Helper for figuring out the default CC for a function declarator type. If 3416 /// this is the outermost chunk, then we can determine the CC from the 3417 /// declarator context. If not, then this could be either a member function 3418 /// type or normal function type. 3419 static CallingConv getCCForDeclaratorChunk( 3420 Sema &S, Declarator &D, const ParsedAttributesView &AttrList, 3421 const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) { 3422 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function); 3423 3424 // Check for an explicit CC attribute. 3425 for (const ParsedAttr &AL : AttrList) { 3426 switch (AL.getKind()) { 3427 CALLING_CONV_ATTRS_CASELIST : { 3428 // Ignore attributes that don't validate or can't apply to the 3429 // function type. We'll diagnose the failure to apply them in 3430 // handleFunctionTypeAttr. 3431 CallingConv CC; 3432 if (!S.CheckCallingConvAttr(AL, CC) && 3433 (!FTI.isVariadic || supportsVariadicCall(CC))) { 3434 return CC; 3435 } 3436 break; 3437 } 3438 3439 default: 3440 break; 3441 } 3442 } 3443 3444 bool IsCXXInstanceMethod = false; 3445 3446 if (S.getLangOpts().CPlusPlus) { 3447 // Look inwards through parentheses to see if this chunk will form a 3448 // member pointer type or if we're the declarator. Any type attributes 3449 // between here and there will override the CC we choose here. 3450 unsigned I = ChunkIndex; 3451 bool FoundNonParen = false; 3452 while (I && !FoundNonParen) { 3453 --I; 3454 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren) 3455 FoundNonParen = true; 3456 } 3457 3458 if (FoundNonParen) { 3459 // If we're not the declarator, we're a regular function type unless we're 3460 // in a member pointer. 3461 IsCXXInstanceMethod = 3462 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer; 3463 } else if (D.getContext() == DeclaratorContext::LambdaExprContext) { 3464 // This can only be a call operator for a lambda, which is an instance 3465 // method. 3466 IsCXXInstanceMethod = true; 3467 } else { 3468 // We're the innermost decl chunk, so must be a function declarator. 3469 assert(D.isFunctionDeclarator()); 3470 3471 // If we're inside a record, we're declaring a method, but it could be 3472 // explicitly or implicitly static. 3473 IsCXXInstanceMethod = 3474 D.isFirstDeclarationOfMember() && 3475 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 3476 !D.isStaticMember(); 3477 } 3478 } 3479 3480 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic, 3481 IsCXXInstanceMethod); 3482 3483 // Attribute AT_OpenCLKernel affects the calling convention for SPIR 3484 // and AMDGPU targets, hence it cannot be treated as a calling 3485 // convention attribute. This is the simplest place to infer 3486 // calling convention for OpenCL kernels. 3487 if (S.getLangOpts().OpenCL) { 3488 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) { 3489 if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) { 3490 CC = CC_OpenCLKernel; 3491 break; 3492 } 3493 } 3494 } 3495 3496 return CC; 3497 } 3498 3499 namespace { 3500 /// A simple notion of pointer kinds, which matches up with the various 3501 /// pointer declarators. 3502 enum class SimplePointerKind { 3503 Pointer, 3504 BlockPointer, 3505 MemberPointer, 3506 Array, 3507 }; 3508 } // end anonymous namespace 3509 3510 IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) { 3511 switch (nullability) { 3512 case NullabilityKind::NonNull: 3513 if (!Ident__Nonnull) 3514 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull"); 3515 return Ident__Nonnull; 3516 3517 case NullabilityKind::Nullable: 3518 if (!Ident__Nullable) 3519 Ident__Nullable = PP.getIdentifierInfo("_Nullable"); 3520 return Ident__Nullable; 3521 3522 case NullabilityKind::Unspecified: 3523 if (!Ident__Null_unspecified) 3524 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified"); 3525 return Ident__Null_unspecified; 3526 } 3527 llvm_unreachable("Unknown nullability kind."); 3528 } 3529 3530 /// Retrieve the identifier "NSError". 3531 IdentifierInfo *Sema::getNSErrorIdent() { 3532 if (!Ident_NSError) 3533 Ident_NSError = PP.getIdentifierInfo("NSError"); 3534 3535 return Ident_NSError; 3536 } 3537 3538 /// Check whether there is a nullability attribute of any kind in the given 3539 /// attribute list. 3540 static bool hasNullabilityAttr(const ParsedAttributesView &attrs) { 3541 for (const ParsedAttr &AL : attrs) { 3542 if (AL.getKind() == ParsedAttr::AT_TypeNonNull || 3543 AL.getKind() == ParsedAttr::AT_TypeNullable || 3544 AL.getKind() == ParsedAttr::AT_TypeNullUnspecified) 3545 return true; 3546 } 3547 3548 return false; 3549 } 3550 3551 namespace { 3552 /// Describes the kind of a pointer a declarator describes. 3553 enum class PointerDeclaratorKind { 3554 // Not a pointer. 3555 NonPointer, 3556 // Single-level pointer. 3557 SingleLevelPointer, 3558 // Multi-level pointer (of any pointer kind). 3559 MultiLevelPointer, 3560 // CFFooRef* 3561 MaybePointerToCFRef, 3562 // CFErrorRef* 3563 CFErrorRefPointer, 3564 // NSError** 3565 NSErrorPointerPointer, 3566 }; 3567 3568 /// Describes a declarator chunk wrapping a pointer that marks inference as 3569 /// unexpected. 3570 // These values must be kept in sync with diagnostics. 3571 enum class PointerWrappingDeclaratorKind { 3572 /// Pointer is top-level. 3573 None = -1, 3574 /// Pointer is an array element. 3575 Array = 0, 3576 /// Pointer is the referent type of a C++ reference. 3577 Reference = 1 3578 }; 3579 } // end anonymous namespace 3580 3581 /// Classify the given declarator, whose type-specified is \c type, based on 3582 /// what kind of pointer it refers to. 3583 /// 3584 /// This is used to determine the default nullability. 3585 static PointerDeclaratorKind 3586 classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator, 3587 PointerWrappingDeclaratorKind &wrappingKind) { 3588 unsigned numNormalPointers = 0; 3589 3590 // For any dependent type, we consider it a non-pointer. 3591 if (type->isDependentType()) 3592 return PointerDeclaratorKind::NonPointer; 3593 3594 // Look through the declarator chunks to identify pointers. 3595 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) { 3596 DeclaratorChunk &chunk = declarator.getTypeObject(i); 3597 switch (chunk.Kind) { 3598 case DeclaratorChunk::Array: 3599 if (numNormalPointers == 0) 3600 wrappingKind = PointerWrappingDeclaratorKind::Array; 3601 break; 3602 3603 case DeclaratorChunk::Function: 3604 case DeclaratorChunk::Pipe: 3605 break; 3606 3607 case DeclaratorChunk::BlockPointer: 3608 case DeclaratorChunk::MemberPointer: 3609 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer 3610 : PointerDeclaratorKind::SingleLevelPointer; 3611 3612 case DeclaratorChunk::Paren: 3613 break; 3614 3615 case DeclaratorChunk::Reference: 3616 if (numNormalPointers == 0) 3617 wrappingKind = PointerWrappingDeclaratorKind::Reference; 3618 break; 3619 3620 case DeclaratorChunk::Pointer: 3621 ++numNormalPointers; 3622 if (numNormalPointers > 2) 3623 return PointerDeclaratorKind::MultiLevelPointer; 3624 break; 3625 } 3626 } 3627 3628 // Then, dig into the type specifier itself. 3629 unsigned numTypeSpecifierPointers = 0; 3630 do { 3631 // Decompose normal pointers. 3632 if (auto ptrType = type->getAs<PointerType>()) { 3633 ++numNormalPointers; 3634 3635 if (numNormalPointers > 2) 3636 return PointerDeclaratorKind::MultiLevelPointer; 3637 3638 type = ptrType->getPointeeType(); 3639 ++numTypeSpecifierPointers; 3640 continue; 3641 } 3642 3643 // Decompose block pointers. 3644 if (type->getAs<BlockPointerType>()) { 3645 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer 3646 : PointerDeclaratorKind::SingleLevelPointer; 3647 } 3648 3649 // Decompose member pointers. 3650 if (type->getAs<MemberPointerType>()) { 3651 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer 3652 : PointerDeclaratorKind::SingleLevelPointer; 3653 } 3654 3655 // Look at Objective-C object pointers. 3656 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) { 3657 ++numNormalPointers; 3658 ++numTypeSpecifierPointers; 3659 3660 // If this is NSError**, report that. 3661 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) { 3662 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() && 3663 numNormalPointers == 2 && numTypeSpecifierPointers < 2) { 3664 return PointerDeclaratorKind::NSErrorPointerPointer; 3665 } 3666 } 3667 3668 break; 3669 } 3670 3671 // Look at Objective-C class types. 3672 if (auto objcClass = type->getAs<ObjCInterfaceType>()) { 3673 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) { 3674 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2) 3675 return PointerDeclaratorKind::NSErrorPointerPointer; 3676 } 3677 3678 break; 3679 } 3680 3681 // If at this point we haven't seen a pointer, we won't see one. 3682 if (numNormalPointers == 0) 3683 return PointerDeclaratorKind::NonPointer; 3684 3685 if (auto recordType = type->getAs<RecordType>()) { 3686 RecordDecl *recordDecl = recordType->getDecl(); 3687 3688 bool isCFError = false; 3689 if (S.CFError) { 3690 // If we already know about CFError, test it directly. 3691 isCFError = (S.CFError == recordDecl); 3692 } else { 3693 // Check whether this is CFError, which we identify based on its bridge 3694 // to NSError. CFErrorRef used to be declared with "objc_bridge" but is 3695 // now declared with "objc_bridge_mutable", so look for either one of 3696 // the two attributes. 3697 if (recordDecl->getTagKind() == TTK_Struct && numNormalPointers > 0) { 3698 IdentifierInfo *bridgedType = nullptr; 3699 if (auto bridgeAttr = recordDecl->getAttr<ObjCBridgeAttr>()) 3700 bridgedType = bridgeAttr->getBridgedType(); 3701 else if (auto bridgeAttr = 3702 recordDecl->getAttr<ObjCBridgeMutableAttr>()) 3703 bridgedType = bridgeAttr->getBridgedType(); 3704 3705 if (bridgedType == S.getNSErrorIdent()) { 3706 S.CFError = recordDecl; 3707 isCFError = true; 3708 } 3709 } 3710 } 3711 3712 // If this is CFErrorRef*, report it as such. 3713 if (isCFError && numNormalPointers == 2 && numTypeSpecifierPointers < 2) { 3714 return PointerDeclaratorKind::CFErrorRefPointer; 3715 } 3716 break; 3717 } 3718 3719 break; 3720 } while (true); 3721 3722 switch (numNormalPointers) { 3723 case 0: 3724 return PointerDeclaratorKind::NonPointer; 3725 3726 case 1: 3727 return PointerDeclaratorKind::SingleLevelPointer; 3728 3729 case 2: 3730 return PointerDeclaratorKind::MaybePointerToCFRef; 3731 3732 default: 3733 return PointerDeclaratorKind::MultiLevelPointer; 3734 } 3735 } 3736 3737 static FileID getNullabilityCompletenessCheckFileID(Sema &S, 3738 SourceLocation loc) { 3739 // If we're anywhere in a function, method, or closure context, don't perform 3740 // completeness checks. 3741 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) { 3742 if (ctx->isFunctionOrMethod()) 3743 return FileID(); 3744 3745 if (ctx->isFileContext()) 3746 break; 3747 } 3748 3749 // We only care about the expansion location. 3750 loc = S.SourceMgr.getExpansionLoc(loc); 3751 FileID file = S.SourceMgr.getFileID(loc); 3752 if (file.isInvalid()) 3753 return FileID(); 3754 3755 // Retrieve file information. 3756 bool invalid = false; 3757 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid); 3758 if (invalid || !sloc.isFile()) 3759 return FileID(); 3760 3761 // We don't want to perform completeness checks on the main file or in 3762 // system headers. 3763 const SrcMgr::FileInfo &fileInfo = sloc.getFile(); 3764 if (fileInfo.getIncludeLoc().isInvalid()) 3765 return FileID(); 3766 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User && 3767 S.Diags.getSuppressSystemWarnings()) { 3768 return FileID(); 3769 } 3770 3771 return file; 3772 } 3773 3774 /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc, 3775 /// taking into account whitespace before and after. 3776 static void fixItNullability(Sema &S, DiagnosticBuilder &Diag, 3777 SourceLocation PointerLoc, 3778 NullabilityKind Nullability) { 3779 assert(PointerLoc.isValid()); 3780 if (PointerLoc.isMacroID()) 3781 return; 3782 3783 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc); 3784 if (!FixItLoc.isValid() || FixItLoc == PointerLoc) 3785 return; 3786 3787 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc); 3788 if (!NextChar) 3789 return; 3790 3791 SmallString<32> InsertionTextBuf{" "}; 3792 InsertionTextBuf += getNullabilitySpelling(Nullability); 3793 InsertionTextBuf += " "; 3794 StringRef InsertionText = InsertionTextBuf.str(); 3795 3796 if (isWhitespace(*NextChar)) { 3797 InsertionText = InsertionText.drop_back(); 3798 } else if (NextChar[-1] == '[') { 3799 if (NextChar[0] == ']') 3800 InsertionText = InsertionText.drop_back().drop_front(); 3801 else 3802 InsertionText = InsertionText.drop_front(); 3803 } else if (!isIdentifierBody(NextChar[0], /*allow dollar*/true) && 3804 !isIdentifierBody(NextChar[-1], /*allow dollar*/true)) { 3805 InsertionText = InsertionText.drop_back().drop_front(); 3806 } 3807 3808 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText); 3809 } 3810 3811 static void emitNullabilityConsistencyWarning(Sema &S, 3812 SimplePointerKind PointerKind, 3813 SourceLocation PointerLoc, 3814 SourceLocation PointerEndLoc) { 3815 assert(PointerLoc.isValid()); 3816 3817 if (PointerKind == SimplePointerKind::Array) { 3818 S.Diag(PointerLoc, diag::warn_nullability_missing_array); 3819 } else { 3820 S.Diag(PointerLoc, diag::warn_nullability_missing) 3821 << static_cast<unsigned>(PointerKind); 3822 } 3823 3824 auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc; 3825 if (FixItLoc.isMacroID()) 3826 return; 3827 3828 auto addFixIt = [&](NullabilityKind Nullability) { 3829 auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it); 3830 Diag << static_cast<unsigned>(Nullability); 3831 Diag << static_cast<unsigned>(PointerKind); 3832 fixItNullability(S, Diag, FixItLoc, Nullability); 3833 }; 3834 addFixIt(NullabilityKind::Nullable); 3835 addFixIt(NullabilityKind::NonNull); 3836 } 3837 3838 /// Complains about missing nullability if the file containing \p pointerLoc 3839 /// has other uses of nullability (either the keywords or the \c assume_nonnull 3840 /// pragma). 3841 /// 3842 /// If the file has \e not seen other uses of nullability, this particular 3843 /// pointer is saved for possible later diagnosis. See recordNullabilitySeen(). 3844 static void 3845 checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind, 3846 SourceLocation pointerLoc, 3847 SourceLocation pointerEndLoc = SourceLocation()) { 3848 // Determine which file we're performing consistency checking for. 3849 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc); 3850 if (file.isInvalid()) 3851 return; 3852 3853 // If we haven't seen any type nullability in this file, we won't warn now 3854 // about anything. 3855 FileNullability &fileNullability = S.NullabilityMap[file]; 3856 if (!fileNullability.SawTypeNullability) { 3857 // If this is the first pointer declarator in the file, and the appropriate 3858 // warning is on, record it in case we need to diagnose it retroactively. 3859 diag::kind diagKind; 3860 if (pointerKind == SimplePointerKind::Array) 3861 diagKind = diag::warn_nullability_missing_array; 3862 else 3863 diagKind = diag::warn_nullability_missing; 3864 3865 if (fileNullability.PointerLoc.isInvalid() && 3866 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) { 3867 fileNullability.PointerLoc = pointerLoc; 3868 fileNullability.PointerEndLoc = pointerEndLoc; 3869 fileNullability.PointerKind = static_cast<unsigned>(pointerKind); 3870 } 3871 3872 return; 3873 } 3874 3875 // Complain about missing nullability. 3876 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc); 3877 } 3878 3879 /// Marks that a nullability feature has been used in the file containing 3880 /// \p loc. 3881 /// 3882 /// If this file already had pointer types in it that were missing nullability, 3883 /// the first such instance is retroactively diagnosed. 3884 /// 3885 /// \sa checkNullabilityConsistency 3886 static void recordNullabilitySeen(Sema &S, SourceLocation loc) { 3887 FileID file = getNullabilityCompletenessCheckFileID(S, loc); 3888 if (file.isInvalid()) 3889 return; 3890 3891 FileNullability &fileNullability = S.NullabilityMap[file]; 3892 if (fileNullability.SawTypeNullability) 3893 return; 3894 fileNullability.SawTypeNullability = true; 3895 3896 // If we haven't seen any type nullability before, now we have. Retroactively 3897 // diagnose the first unannotated pointer, if there was one. 3898 if (fileNullability.PointerLoc.isInvalid()) 3899 return; 3900 3901 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind); 3902 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc, 3903 fileNullability.PointerEndLoc); 3904 } 3905 3906 /// Returns true if any of the declarator chunks before \p endIndex include a 3907 /// level of indirection: array, pointer, reference, or pointer-to-member. 3908 /// 3909 /// Because declarator chunks are stored in outer-to-inner order, testing 3910 /// every chunk before \p endIndex is testing all chunks that embed the current 3911 /// chunk as part of their type. 3912 /// 3913 /// It is legal to pass the result of Declarator::getNumTypeObjects() as the 3914 /// end index, in which case all chunks are tested. 3915 static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) { 3916 unsigned i = endIndex; 3917 while (i != 0) { 3918 // Walk outwards along the declarator chunks. 3919 --i; 3920 const DeclaratorChunk &DC = D.getTypeObject(i); 3921 switch (DC.Kind) { 3922 case DeclaratorChunk::Paren: 3923 break; 3924 case DeclaratorChunk::Array: 3925 case DeclaratorChunk::Pointer: 3926 case DeclaratorChunk::Reference: 3927 case DeclaratorChunk::MemberPointer: 3928 return true; 3929 case DeclaratorChunk::Function: 3930 case DeclaratorChunk::BlockPointer: 3931 case DeclaratorChunk::Pipe: 3932 // These are invalid anyway, so just ignore. 3933 break; 3934 } 3935 } 3936 return false; 3937 } 3938 3939 static bool IsNoDerefableChunk(DeclaratorChunk Chunk) { 3940 return (Chunk.Kind == DeclaratorChunk::Pointer || 3941 Chunk.Kind == DeclaratorChunk::Array); 3942 } 3943 3944 template<typename AttrT> 3945 static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &Attr) { 3946 Attr.setUsedAsTypeAttr(); 3947 return ::new (Ctx) 3948 AttrT(Attr.getRange(), Ctx, Attr.getAttributeSpellingListIndex()); 3949 } 3950 3951 static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr, 3952 NullabilityKind NK) { 3953 switch (NK) { 3954 case NullabilityKind::NonNull: 3955 return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr); 3956 3957 case NullabilityKind::Nullable: 3958 return createSimpleAttr<TypeNullableAttr>(Ctx, Attr); 3959 3960 case NullabilityKind::Unspecified: 3961 return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr); 3962 } 3963 llvm_unreachable("unknown NullabilityKind"); 3964 } 3965 3966 // Diagnose whether this is a case with the multiple addr spaces. 3967 // Returns true if this is an invalid case. 3968 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified 3969 // by qualifiers for two or more different address spaces." 3970 static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld, 3971 LangAS ASNew, 3972 SourceLocation AttrLoc) { 3973 if (ASOld != LangAS::Default) { 3974 if (ASOld != ASNew) { 3975 S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers); 3976 return true; 3977 } 3978 // Emit a warning if they are identical; it's likely unintended. 3979 S.Diag(AttrLoc, 3980 diag::warn_attribute_address_multiple_identical_qualifiers); 3981 } 3982 return false; 3983 } 3984 3985 static TypeSourceInfo * 3986 GetTypeSourceInfoForDeclarator(TypeProcessingState &State, 3987 QualType T, TypeSourceInfo *ReturnTypeInfo); 3988 3989 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 3990 QualType declSpecType, 3991 TypeSourceInfo *TInfo) { 3992 // The TypeSourceInfo that this function returns will not be a null type. 3993 // If there is an error, this function will fill in a dummy type as fallback. 3994 QualType T = declSpecType; 3995 Declarator &D = state.getDeclarator(); 3996 Sema &S = state.getSema(); 3997 ASTContext &Context = S.Context; 3998 const LangOptions &LangOpts = S.getLangOpts(); 3999 4000 // The name we're declaring, if any. 4001 DeclarationName Name; 4002 if (D.getIdentifier()) 4003 Name = D.getIdentifier(); 4004 4005 // Does this declaration declare a typedef-name? 4006 bool IsTypedefName = 4007 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 4008 D.getContext() == DeclaratorContext::AliasDeclContext || 4009 D.getContext() == DeclaratorContext::AliasTemplateContext; 4010 4011 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 4012 bool IsQualifiedFunction = T->isFunctionProtoType() && 4013 (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() || 4014 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 4015 4016 // If T is 'decltype(auto)', the only declarators we can have are parens 4017 // and at most one function declarator if this is a function declaration. 4018 // If T is a deduced class template specialization type, we can have no 4019 // declarator chunks at all. 4020 if (auto *DT = T->getAs<DeducedType>()) { 4021 const AutoType *AT = T->getAs<AutoType>(); 4022 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT); 4023 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) { 4024 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 4025 unsigned Index = E - I - 1; 4026 DeclaratorChunk &DeclChunk = D.getTypeObject(Index); 4027 unsigned DiagId = IsClassTemplateDeduction 4028 ? diag::err_deduced_class_template_compound_type 4029 : diag::err_decltype_auto_compound_type; 4030 unsigned DiagKind = 0; 4031 switch (DeclChunk.Kind) { 4032 case DeclaratorChunk::Paren: 4033 // FIXME: Rejecting this is a little silly. 4034 if (IsClassTemplateDeduction) { 4035 DiagKind = 4; 4036 break; 4037 } 4038 continue; 4039 case DeclaratorChunk::Function: { 4040 if (IsClassTemplateDeduction) { 4041 DiagKind = 3; 4042 break; 4043 } 4044 unsigned FnIndex; 4045 if (D.isFunctionDeclarationContext() && 4046 D.isFunctionDeclarator(FnIndex) && FnIndex == Index) 4047 continue; 4048 DiagId = diag::err_decltype_auto_function_declarator_not_declaration; 4049 break; 4050 } 4051 case DeclaratorChunk::Pointer: 4052 case DeclaratorChunk::BlockPointer: 4053 case DeclaratorChunk::MemberPointer: 4054 DiagKind = 0; 4055 break; 4056 case DeclaratorChunk::Reference: 4057 DiagKind = 1; 4058 break; 4059 case DeclaratorChunk::Array: 4060 DiagKind = 2; 4061 break; 4062 case DeclaratorChunk::Pipe: 4063 break; 4064 } 4065 4066 S.Diag(DeclChunk.Loc, DiagId) << DiagKind; 4067 D.setInvalidType(true); 4068 break; 4069 } 4070 } 4071 } 4072 4073 // Determine whether we should infer _Nonnull on pointer types. 4074 Optional<NullabilityKind> inferNullability; 4075 bool inferNullabilityCS = false; 4076 bool inferNullabilityInnerOnly = false; 4077 bool inferNullabilityInnerOnlyComplete = false; 4078 4079 // Are we in an assume-nonnull region? 4080 bool inAssumeNonNullRegion = false; 4081 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc(); 4082 if (assumeNonNullLoc.isValid()) { 4083 inAssumeNonNullRegion = true; 4084 recordNullabilitySeen(S, assumeNonNullLoc); 4085 } 4086 4087 // Whether to complain about missing nullability specifiers or not. 4088 enum { 4089 /// Never complain. 4090 CAMN_No, 4091 /// Complain on the inner pointers (but not the outermost 4092 /// pointer). 4093 CAMN_InnerPointers, 4094 /// Complain about any pointers that don't have nullability 4095 /// specified or inferred. 4096 CAMN_Yes 4097 } complainAboutMissingNullability = CAMN_No; 4098 unsigned NumPointersRemaining = 0; 4099 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None; 4100 4101 if (IsTypedefName) { 4102 // For typedefs, we do not infer any nullability (the default), 4103 // and we only complain about missing nullability specifiers on 4104 // inner pointers. 4105 complainAboutMissingNullability = CAMN_InnerPointers; 4106 4107 if (T->canHaveNullability(/*ResultIfUnknown*/false) && 4108 !T->getNullability(S.Context)) { 4109 // Note that we allow but don't require nullability on dependent types. 4110 ++NumPointersRemaining; 4111 } 4112 4113 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) { 4114 DeclaratorChunk &chunk = D.getTypeObject(i); 4115 switch (chunk.Kind) { 4116 case DeclaratorChunk::Array: 4117 case DeclaratorChunk::Function: 4118 case DeclaratorChunk::Pipe: 4119 break; 4120 4121 case DeclaratorChunk::BlockPointer: 4122 case DeclaratorChunk::MemberPointer: 4123 ++NumPointersRemaining; 4124 break; 4125 4126 case DeclaratorChunk::Paren: 4127 case DeclaratorChunk::Reference: 4128 continue; 4129 4130 case DeclaratorChunk::Pointer: 4131 ++NumPointersRemaining; 4132 continue; 4133 } 4134 } 4135 } else { 4136 bool isFunctionOrMethod = false; 4137 switch (auto context = state.getDeclarator().getContext()) { 4138 case DeclaratorContext::ObjCParameterContext: 4139 case DeclaratorContext::ObjCResultContext: 4140 case DeclaratorContext::PrototypeContext: 4141 case DeclaratorContext::TrailingReturnContext: 4142 case DeclaratorContext::TrailingReturnVarContext: 4143 isFunctionOrMethod = true; 4144 LLVM_FALLTHROUGH; 4145 4146 case DeclaratorContext::MemberContext: 4147 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) { 4148 complainAboutMissingNullability = CAMN_No; 4149 break; 4150 } 4151 4152 // Weak properties are inferred to be nullable. 4153 if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) { 4154 inferNullability = NullabilityKind::Nullable; 4155 break; 4156 } 4157 4158 LLVM_FALLTHROUGH; 4159 4160 case DeclaratorContext::FileContext: 4161 case DeclaratorContext::KNRTypeListContext: { 4162 complainAboutMissingNullability = CAMN_Yes; 4163 4164 // Nullability inference depends on the type and declarator. 4165 auto wrappingKind = PointerWrappingDeclaratorKind::None; 4166 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) { 4167 case PointerDeclaratorKind::NonPointer: 4168 case PointerDeclaratorKind::MultiLevelPointer: 4169 // Cannot infer nullability. 4170 break; 4171 4172 case PointerDeclaratorKind::SingleLevelPointer: 4173 // Infer _Nonnull if we are in an assumes-nonnull region. 4174 if (inAssumeNonNullRegion) { 4175 complainAboutInferringWithinChunk = wrappingKind; 4176 inferNullability = NullabilityKind::NonNull; 4177 inferNullabilityCS = 4178 (context == DeclaratorContext::ObjCParameterContext || 4179 context == DeclaratorContext::ObjCResultContext); 4180 } 4181 break; 4182 4183 case PointerDeclaratorKind::CFErrorRefPointer: 4184 case PointerDeclaratorKind::NSErrorPointerPointer: 4185 // Within a function or method signature, infer _Nullable at both 4186 // levels. 4187 if (isFunctionOrMethod && inAssumeNonNullRegion) 4188 inferNullability = NullabilityKind::Nullable; 4189 break; 4190 4191 case PointerDeclaratorKind::MaybePointerToCFRef: 4192 if (isFunctionOrMethod) { 4193 // On pointer-to-pointer parameters marked cf_returns_retained or 4194 // cf_returns_not_retained, if the outer pointer is explicit then 4195 // infer the inner pointer as _Nullable. 4196 auto hasCFReturnsAttr = 4197 [](const ParsedAttributesView &AttrList) -> bool { 4198 return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) || 4199 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained); 4200 }; 4201 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) { 4202 if (hasCFReturnsAttr(D.getAttributes()) || 4203 hasCFReturnsAttr(InnermostChunk->getAttrs()) || 4204 hasCFReturnsAttr(D.getDeclSpec().getAttributes())) { 4205 inferNullability = NullabilityKind::Nullable; 4206 inferNullabilityInnerOnly = true; 4207 } 4208 } 4209 } 4210 break; 4211 } 4212 break; 4213 } 4214 4215 case DeclaratorContext::ConversionIdContext: 4216 complainAboutMissingNullability = CAMN_Yes; 4217 break; 4218 4219 case DeclaratorContext::AliasDeclContext: 4220 case DeclaratorContext::AliasTemplateContext: 4221 case DeclaratorContext::BlockContext: 4222 case DeclaratorContext::BlockLiteralContext: 4223 case DeclaratorContext::ConditionContext: 4224 case DeclaratorContext::CXXCatchContext: 4225 case DeclaratorContext::CXXNewContext: 4226 case DeclaratorContext::ForContext: 4227 case DeclaratorContext::InitStmtContext: 4228 case DeclaratorContext::LambdaExprContext: 4229 case DeclaratorContext::LambdaExprParameterContext: 4230 case DeclaratorContext::ObjCCatchContext: 4231 case DeclaratorContext::TemplateParamContext: 4232 case DeclaratorContext::TemplateArgContext: 4233 case DeclaratorContext::TemplateTypeArgContext: 4234 case DeclaratorContext::TypeNameContext: 4235 case DeclaratorContext::FunctionalCastContext: 4236 // Don't infer in these contexts. 4237 break; 4238 } 4239 } 4240 4241 // Local function that returns true if its argument looks like a va_list. 4242 auto isVaList = [&S](QualType T) -> bool { 4243 auto *typedefTy = T->getAs<TypedefType>(); 4244 if (!typedefTy) 4245 return false; 4246 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl(); 4247 do { 4248 if (typedefTy->getDecl() == vaListTypedef) 4249 return true; 4250 if (auto *name = typedefTy->getDecl()->getIdentifier()) 4251 if (name->isStr("va_list")) 4252 return true; 4253 typedefTy = typedefTy->desugar()->getAs<TypedefType>(); 4254 } while (typedefTy); 4255 return false; 4256 }; 4257 4258 // Local function that checks the nullability for a given pointer declarator. 4259 // Returns true if _Nonnull was inferred. 4260 auto inferPointerNullability = 4261 [&](SimplePointerKind pointerKind, SourceLocation pointerLoc, 4262 SourceLocation pointerEndLoc, 4263 ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * { 4264 // We've seen a pointer. 4265 if (NumPointersRemaining > 0) 4266 --NumPointersRemaining; 4267 4268 // If a nullability attribute is present, there's nothing to do. 4269 if (hasNullabilityAttr(attrs)) 4270 return nullptr; 4271 4272 // If we're supposed to infer nullability, do so now. 4273 if (inferNullability && !inferNullabilityInnerOnlyComplete) { 4274 ParsedAttr::Syntax syntax = inferNullabilityCS 4275 ? ParsedAttr::AS_ContextSensitiveKeyword 4276 : ParsedAttr::AS_Keyword; 4277 ParsedAttr *nullabilityAttr = Pool.create( 4278 S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc), 4279 nullptr, SourceLocation(), nullptr, 0, syntax); 4280 4281 attrs.addAtEnd(nullabilityAttr); 4282 4283 if (inferNullabilityCS) { 4284 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers() 4285 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability); 4286 } 4287 4288 if (pointerLoc.isValid() && 4289 complainAboutInferringWithinChunk != 4290 PointerWrappingDeclaratorKind::None) { 4291 auto Diag = 4292 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type); 4293 Diag << static_cast<int>(complainAboutInferringWithinChunk); 4294 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull); 4295 } 4296 4297 if (inferNullabilityInnerOnly) 4298 inferNullabilityInnerOnlyComplete = true; 4299 return nullabilityAttr; 4300 } 4301 4302 // If we're supposed to complain about missing nullability, do so 4303 // now if it's truly missing. 4304 switch (complainAboutMissingNullability) { 4305 case CAMN_No: 4306 break; 4307 4308 case CAMN_InnerPointers: 4309 if (NumPointersRemaining == 0) 4310 break; 4311 LLVM_FALLTHROUGH; 4312 4313 case CAMN_Yes: 4314 checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc); 4315 } 4316 return nullptr; 4317 }; 4318 4319 // If the type itself could have nullability but does not, infer pointer 4320 // nullability and perform consistency checking. 4321 if (S.CodeSynthesisContexts.empty()) { 4322 if (T->canHaveNullability(/*ResultIfUnknown*/false) && 4323 !T->getNullability(S.Context)) { 4324 if (isVaList(T)) { 4325 // Record that we've seen a pointer, but do nothing else. 4326 if (NumPointersRemaining > 0) 4327 --NumPointersRemaining; 4328 } else { 4329 SimplePointerKind pointerKind = SimplePointerKind::Pointer; 4330 if (T->isBlockPointerType()) 4331 pointerKind = SimplePointerKind::BlockPointer; 4332 else if (T->isMemberPointerType()) 4333 pointerKind = SimplePointerKind::MemberPointer; 4334 4335 if (auto *attr = inferPointerNullability( 4336 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(), 4337 D.getDeclSpec().getEndLoc(), 4338 D.getMutableDeclSpec().getAttributes(), 4339 D.getMutableDeclSpec().getAttributePool())) { 4340 T = state.getAttributedType( 4341 createNullabilityAttr(Context, *attr, *inferNullability), T, T); 4342 } 4343 } 4344 } 4345 4346 if (complainAboutMissingNullability == CAMN_Yes && 4347 T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) && 4348 D.isPrototypeContext() && 4349 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) { 4350 checkNullabilityConsistency(S, SimplePointerKind::Array, 4351 D.getDeclSpec().getTypeSpecTypeLoc()); 4352 } 4353 } 4354 4355 bool ExpectNoDerefChunk = 4356 state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref); 4357 4358 // Walk the DeclTypeInfo, building the recursive type as we go. 4359 // DeclTypeInfos are ordered from the identifier out, which is 4360 // opposite of what we want :). 4361 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 4362 unsigned chunkIndex = e - i - 1; 4363 state.setCurrentChunkIndex(chunkIndex); 4364 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 4365 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren; 4366 switch (DeclType.Kind) { 4367 case DeclaratorChunk::Paren: 4368 if (i == 0) 4369 warnAboutRedundantParens(S, D, T); 4370 T = S.BuildParenType(T); 4371 break; 4372 case DeclaratorChunk::BlockPointer: 4373 // If blocks are disabled, emit an error. 4374 if (!LangOpts.Blocks) 4375 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL; 4376 4377 // Handle pointer nullability. 4378 inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc, 4379 DeclType.EndLoc, DeclType.getAttrs(), 4380 state.getDeclarator().getAttributePool()); 4381 4382 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 4383 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) { 4384 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly 4385 // qualified with const. 4386 if (LangOpts.OpenCL) 4387 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const; 4388 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 4389 } 4390 break; 4391 case DeclaratorChunk::Pointer: 4392 // Verify that we're not building a pointer to pointer to function with 4393 // exception specification. 4394 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 4395 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 4396 D.setInvalidType(true); 4397 // Build the type anyway. 4398 } 4399 4400 // Handle pointer nullability 4401 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc, 4402 DeclType.EndLoc, DeclType.getAttrs(), 4403 state.getDeclarator().getAttributePool()); 4404 4405 if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) { 4406 T = Context.getObjCObjectPointerType(T); 4407 if (DeclType.Ptr.TypeQuals) 4408 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 4409 break; 4410 } 4411 4412 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used. 4413 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used. 4414 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed. 4415 if (LangOpts.OpenCL) { 4416 if (T->isImageType() || T->isSamplerT() || T->isPipeType() || 4417 T->isBlockPointerType()) { 4418 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T; 4419 D.setInvalidType(true); 4420 } 4421 } 4422 4423 T = S.BuildPointerType(T, DeclType.Loc, Name); 4424 if (DeclType.Ptr.TypeQuals) 4425 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 4426 break; 4427 case DeclaratorChunk::Reference: { 4428 // Verify that we're not building a reference to pointer to function with 4429 // exception specification. 4430 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 4431 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 4432 D.setInvalidType(true); 4433 // Build the type anyway. 4434 } 4435 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 4436 4437 if (DeclType.Ref.HasRestrict) 4438 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 4439 break; 4440 } 4441 case DeclaratorChunk::Array: { 4442 // Verify that we're not building an array of pointers to function with 4443 // exception specification. 4444 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 4445 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 4446 D.setInvalidType(true); 4447 // Build the type anyway. 4448 } 4449 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 4450 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 4451 ArrayType::ArraySizeModifier ASM; 4452 if (ATI.isStar) 4453 ASM = ArrayType::Star; 4454 else if (ATI.hasStatic) 4455 ASM = ArrayType::Static; 4456 else 4457 ASM = ArrayType::Normal; 4458 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 4459 // FIXME: This check isn't quite right: it allows star in prototypes 4460 // for function definitions, and disallows some edge cases detailed 4461 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 4462 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 4463 ASM = ArrayType::Normal; 4464 D.setInvalidType(true); 4465 } 4466 4467 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 4468 // shall appear only in a declaration of a function parameter with an 4469 // array type, ... 4470 if (ASM == ArrayType::Static || ATI.TypeQuals) { 4471 if (!(D.isPrototypeContext() || 4472 D.getContext() == DeclaratorContext::KNRTypeListContext)) { 4473 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 4474 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 4475 // Remove the 'static' and the type qualifiers. 4476 if (ASM == ArrayType::Static) 4477 ASM = ArrayType::Normal; 4478 ATI.TypeQuals = 0; 4479 D.setInvalidType(true); 4480 } 4481 4482 // C99 6.7.5.2p1: ... and then only in the outermost array type 4483 // derivation. 4484 if (hasOuterPointerLikeChunk(D, chunkIndex)) { 4485 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 4486 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 4487 if (ASM == ArrayType::Static) 4488 ASM = ArrayType::Normal; 4489 ATI.TypeQuals = 0; 4490 D.setInvalidType(true); 4491 } 4492 } 4493 const AutoType *AT = T->getContainedAutoType(); 4494 // Allow arrays of auto if we are a generic lambda parameter. 4495 // i.e. [](auto (&array)[5]) { return array[0]; }; OK 4496 if (AT && 4497 D.getContext() != DeclaratorContext::LambdaExprParameterContext) { 4498 // We've already diagnosed this for decltype(auto). 4499 if (!AT->isDecltypeAuto()) 4500 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto) 4501 << getPrintableNameForEntity(Name) << T; 4502 T = QualType(); 4503 break; 4504 } 4505 4506 // Array parameters can be marked nullable as well, although it's not 4507 // necessary if they're marked 'static'. 4508 if (complainAboutMissingNullability == CAMN_Yes && 4509 !hasNullabilityAttr(DeclType.getAttrs()) && 4510 ASM != ArrayType::Static && 4511 D.isPrototypeContext() && 4512 !hasOuterPointerLikeChunk(D, chunkIndex)) { 4513 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc); 4514 } 4515 4516 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 4517 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 4518 break; 4519 } 4520 case DeclaratorChunk::Function: { 4521 // If the function declarator has a prototype (i.e. it is not () and 4522 // does not have a K&R-style identifier list), then the arguments are part 4523 // of the type, otherwise the argument list is (). 4524 DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 4525 IsQualifiedFunction = 4526 FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier(); 4527 4528 // Check for auto functions and trailing return type and adjust the 4529 // return type accordingly. 4530 if (!D.isInvalidType()) { 4531 // trailing-return-type is only required if we're declaring a function, 4532 // and not, for instance, a pointer to a function. 4533 if (D.getDeclSpec().hasAutoTypeSpec() && 4534 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 4535 if (!S.getLangOpts().CPlusPlus14) { 4536 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 4537 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto 4538 ? diag::err_auto_missing_trailing_return 4539 : diag::err_deduced_return_type); 4540 T = Context.IntTy; 4541 D.setInvalidType(true); 4542 } else { 4543 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 4544 diag::warn_cxx11_compat_deduced_return_type); 4545 } 4546 } else if (FTI.hasTrailingReturnType()) { 4547 // T must be exactly 'auto' at this point. See CWG issue 681. 4548 if (isa<ParenType>(T)) { 4549 S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens) 4550 << T << D.getSourceRange(); 4551 D.setInvalidType(true); 4552 } else if (D.getName().getKind() == 4553 UnqualifiedIdKind::IK_DeductionGuideName) { 4554 if (T != Context.DependentTy) { 4555 S.Diag(D.getDeclSpec().getBeginLoc(), 4556 diag::err_deduction_guide_with_complex_decl) 4557 << D.getSourceRange(); 4558 D.setInvalidType(true); 4559 } 4560 } else if (D.getContext() != DeclaratorContext::LambdaExprContext && 4561 (T.hasQualifiers() || !isa<AutoType>(T) || 4562 cast<AutoType>(T)->getKeyword() != 4563 AutoTypeKeyword::Auto)) { 4564 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 4565 diag::err_trailing_return_without_auto) 4566 << T << D.getDeclSpec().getSourceRange(); 4567 D.setInvalidType(true); 4568 } 4569 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 4570 if (T.isNull()) { 4571 // An error occurred parsing the trailing return type. 4572 T = Context.IntTy; 4573 D.setInvalidType(true); 4574 } 4575 } else { 4576 // This function type is not the type of the entity being declared, 4577 // so checking the 'auto' is not the responsibility of this chunk. 4578 } 4579 } 4580 4581 // C99 6.7.5.3p1: The return type may not be a function or array type. 4582 // For conversion functions, we'll diagnose this particular error later. 4583 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) && 4584 (D.getName().getKind() != 4585 UnqualifiedIdKind::IK_ConversionFunctionId)) { 4586 unsigned diagID = diag::err_func_returning_array_function; 4587 // Last processing chunk in block context means this function chunk 4588 // represents the block. 4589 if (chunkIndex == 0 && 4590 D.getContext() == DeclaratorContext::BlockLiteralContext) 4591 diagID = diag::err_block_returning_array_function; 4592 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 4593 T = Context.IntTy; 4594 D.setInvalidType(true); 4595 } 4596 4597 // Do not allow returning half FP value. 4598 // FIXME: This really should be in BuildFunctionType. 4599 if (T->isHalfType()) { 4600 if (S.getLangOpts().OpenCL) { 4601 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) { 4602 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return) 4603 << T << 0 /*pointer hint*/; 4604 D.setInvalidType(true); 4605 } 4606 } else if (!S.getLangOpts().HalfArgsAndReturns) { 4607 S.Diag(D.getIdentifierLoc(), 4608 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 4609 D.setInvalidType(true); 4610 } 4611 } 4612 4613 if (LangOpts.OpenCL) { 4614 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a 4615 // function. 4616 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() || 4617 T->isPipeType()) { 4618 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return) 4619 << T << 1 /*hint off*/; 4620 D.setInvalidType(true); 4621 } 4622 // OpenCL doesn't support variadic functions and blocks 4623 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf. 4624 // We also allow here any toolchain reserved identifiers. 4625 if (FTI.isVariadic && 4626 !(D.getIdentifier() && 4627 ((D.getIdentifier()->getName() == "printf" && 4628 (LangOpts.OpenCLCPlusPlus || LangOpts.OpenCLVersion >= 120)) || 4629 D.getIdentifier()->getName().startswith("__")))) { 4630 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function); 4631 D.setInvalidType(true); 4632 } 4633 } 4634 4635 // Methods cannot return interface types. All ObjC objects are 4636 // passed by reference. 4637 if (T->isObjCObjectType()) { 4638 SourceLocation DiagLoc, FixitLoc; 4639 if (TInfo) { 4640 DiagLoc = TInfo->getTypeLoc().getBeginLoc(); 4641 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc()); 4642 } else { 4643 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc(); 4644 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc()); 4645 } 4646 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value) 4647 << 0 << T 4648 << FixItHint::CreateInsertion(FixitLoc, "*"); 4649 4650 T = Context.getObjCObjectPointerType(T); 4651 if (TInfo) { 4652 TypeLocBuilder TLB; 4653 TLB.pushFullCopy(TInfo->getTypeLoc()); 4654 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T); 4655 TLoc.setStarLoc(FixitLoc); 4656 TInfo = TLB.getTypeSourceInfo(Context, T); 4657 } 4658 4659 D.setInvalidType(true); 4660 } 4661 4662 // cv-qualifiers on return types are pointless except when the type is a 4663 // class type in C++. 4664 if ((T.getCVRQualifiers() || T->isAtomicType()) && 4665 !(S.getLangOpts().CPlusPlus && 4666 (T->isDependentType() || T->isRecordType()))) { 4667 if (T->isVoidType() && !S.getLangOpts().CPlusPlus && 4668 D.getFunctionDefinitionKind() == FDK_Definition) { 4669 // [6.9.1/3] qualified void return is invalid on a C 4670 // function definition. Apparently ok on declarations and 4671 // in C++ though (!) 4672 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T; 4673 } else 4674 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex); 4675 } 4676 4677 // Objective-C ARC ownership qualifiers are ignored on the function 4678 // return type (by type canonicalization). Complain if this attribute 4679 // was written here. 4680 if (T.getQualifiers().hasObjCLifetime()) { 4681 SourceLocation AttrLoc; 4682 if (chunkIndex + 1 < D.getNumTypeObjects()) { 4683 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 4684 for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) { 4685 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) { 4686 AttrLoc = AL.getLoc(); 4687 break; 4688 } 4689 } 4690 } 4691 if (AttrLoc.isInvalid()) { 4692 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) { 4693 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) { 4694 AttrLoc = AL.getLoc(); 4695 break; 4696 } 4697 } 4698 } 4699 4700 if (AttrLoc.isValid()) { 4701 // The ownership attributes are almost always written via 4702 // the predefined 4703 // __strong/__weak/__autoreleasing/__unsafe_unretained. 4704 if (AttrLoc.isMacroID()) 4705 AttrLoc = 4706 S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin(); 4707 4708 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 4709 << T.getQualifiers().getObjCLifetime(); 4710 } 4711 } 4712 4713 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) { 4714 // C++ [dcl.fct]p6: 4715 // Types shall not be defined in return or parameter types. 4716 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 4717 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 4718 << Context.getTypeDeclType(Tag); 4719 } 4720 4721 // Exception specs are not allowed in typedefs. Complain, but add it 4722 // anyway. 4723 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17) 4724 S.Diag(FTI.getExceptionSpecLocBeg(), 4725 diag::err_exception_spec_in_typedef) 4726 << (D.getContext() == DeclaratorContext::AliasDeclContext || 4727 D.getContext() == DeclaratorContext::AliasTemplateContext); 4728 4729 // If we see "T var();" or "T var(T());" at block scope, it is probably 4730 // an attempt to initialize a variable, not a function declaration. 4731 if (FTI.isAmbiguous) 4732 warnAboutAmbiguousFunction(S, D, DeclType, T); 4733 4734 FunctionType::ExtInfo EI( 4735 getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex)); 4736 4737 if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus 4738 && !LangOpts.OpenCL) { 4739 // Simple void foo(), where the incoming T is the result type. 4740 T = Context.getFunctionNoProtoType(T, EI); 4741 } else { 4742 // We allow a zero-parameter variadic function in C if the 4743 // function is marked with the "overloadable" attribute. Scan 4744 // for this attribute now. 4745 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus) 4746 if (!D.getAttributes().hasAttribute(ParsedAttr::AT_Overloadable)) 4747 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param); 4748 4749 if (FTI.NumParams && FTI.Params[0].Param == nullptr) { 4750 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 4751 // definition. 4752 S.Diag(FTI.Params[0].IdentLoc, 4753 diag::err_ident_list_in_fn_declaration); 4754 D.setInvalidType(true); 4755 // Recover by creating a K&R-style function type. 4756 T = Context.getFunctionNoProtoType(T, EI); 4757 break; 4758 } 4759 4760 FunctionProtoType::ExtProtoInfo EPI; 4761 EPI.ExtInfo = EI; 4762 EPI.Variadic = FTI.isVariadic; 4763 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 4764 EPI.TypeQuals.addCVRUQualifiers( 4765 FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers() 4766 : 0); 4767 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 4768 : FTI.RefQualifierIsLValueRef? RQ_LValue 4769 : RQ_RValue; 4770 4771 // Otherwise, we have a function with a parameter list that is 4772 // potentially variadic. 4773 SmallVector<QualType, 16> ParamTys; 4774 ParamTys.reserve(FTI.NumParams); 4775 4776 SmallVector<FunctionProtoType::ExtParameterInfo, 16> 4777 ExtParameterInfos(FTI.NumParams); 4778 bool HasAnyInterestingExtParameterInfos = false; 4779 4780 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) { 4781 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param); 4782 QualType ParamTy = Param->getType(); 4783 assert(!ParamTy.isNull() && "Couldn't parse type?"); 4784 4785 // Look for 'void'. void is allowed only as a single parameter to a 4786 // function with no other parameters (C99 6.7.5.3p10). We record 4787 // int(void) as a FunctionProtoType with an empty parameter list. 4788 if (ParamTy->isVoidType()) { 4789 // If this is something like 'float(int, void)', reject it. 'void' 4790 // is an incomplete type (C99 6.2.5p19) and function decls cannot 4791 // have parameters of incomplete type. 4792 if (FTI.NumParams != 1 || FTI.isVariadic) { 4793 S.Diag(DeclType.Loc, diag::err_void_only_param); 4794 ParamTy = Context.IntTy; 4795 Param->setType(ParamTy); 4796 } else if (FTI.Params[i].Ident) { 4797 // Reject, but continue to parse 'int(void abc)'. 4798 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type); 4799 ParamTy = Context.IntTy; 4800 Param->setType(ParamTy); 4801 } else { 4802 // Reject, but continue to parse 'float(const void)'. 4803 if (ParamTy.hasQualifiers()) 4804 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 4805 4806 // Do not add 'void' to the list. 4807 break; 4808 } 4809 } else if (ParamTy->isHalfType()) { 4810 // Disallow half FP parameters. 4811 // FIXME: This really should be in BuildFunctionType. 4812 if (S.getLangOpts().OpenCL) { 4813 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) { 4814 S.Diag(Param->getLocation(), 4815 diag::err_opencl_half_param) << ParamTy; 4816 D.setInvalidType(); 4817 Param->setInvalidDecl(); 4818 } 4819 } else if (!S.getLangOpts().HalfArgsAndReturns) { 4820 S.Diag(Param->getLocation(), 4821 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 4822 D.setInvalidType(); 4823 } 4824 } else if (!FTI.hasPrototype) { 4825 if (ParamTy->isPromotableIntegerType()) { 4826 ParamTy = Context.getPromotedIntegerType(ParamTy); 4827 Param->setKNRPromoted(true); 4828 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) { 4829 if (BTy->getKind() == BuiltinType::Float) { 4830 ParamTy = Context.DoubleTy; 4831 Param->setKNRPromoted(true); 4832 } 4833 } 4834 } 4835 4836 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) { 4837 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true); 4838 HasAnyInterestingExtParameterInfos = true; 4839 } 4840 4841 if (auto attr = Param->getAttr<ParameterABIAttr>()) { 4842 ExtParameterInfos[i] = 4843 ExtParameterInfos[i].withABI(attr->getABI()); 4844 HasAnyInterestingExtParameterInfos = true; 4845 } 4846 4847 if (Param->hasAttr<PassObjectSizeAttr>()) { 4848 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize(); 4849 HasAnyInterestingExtParameterInfos = true; 4850 } 4851 4852 if (Param->hasAttr<NoEscapeAttr>()) { 4853 ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true); 4854 HasAnyInterestingExtParameterInfos = true; 4855 } 4856 4857 ParamTys.push_back(ParamTy); 4858 } 4859 4860 if (HasAnyInterestingExtParameterInfos) { 4861 EPI.ExtParameterInfos = ExtParameterInfos.data(); 4862 checkExtParameterInfos(S, ParamTys, EPI, 4863 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); }); 4864 } 4865 4866 SmallVector<QualType, 4> Exceptions; 4867 SmallVector<ParsedType, 2> DynamicExceptions; 4868 SmallVector<SourceRange, 2> DynamicExceptionRanges; 4869 Expr *NoexceptExpr = nullptr; 4870 4871 if (FTI.getExceptionSpecType() == EST_Dynamic) { 4872 // FIXME: It's rather inefficient to have to split into two vectors 4873 // here. 4874 unsigned N = FTI.getNumExceptions(); 4875 DynamicExceptions.reserve(N); 4876 DynamicExceptionRanges.reserve(N); 4877 for (unsigned I = 0; I != N; ++I) { 4878 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 4879 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 4880 } 4881 } else if (isComputedNoexcept(FTI.getExceptionSpecType())) { 4882 NoexceptExpr = FTI.NoexceptExpr; 4883 } 4884 4885 S.checkExceptionSpecification(D.isFunctionDeclarationContext(), 4886 FTI.getExceptionSpecType(), 4887 DynamicExceptions, 4888 DynamicExceptionRanges, 4889 NoexceptExpr, 4890 Exceptions, 4891 EPI.ExceptionSpec); 4892 4893 // FIXME: Set address space from attrs for C++ mode here. 4894 // OpenCLCPlusPlus: A class member function has an address space. 4895 auto IsClassMember = [&]() { 4896 return (!state.getDeclarator().getCXXScopeSpec().isEmpty() && 4897 state.getDeclarator() 4898 .getCXXScopeSpec() 4899 .getScopeRep() 4900 ->getKind() == NestedNameSpecifier::TypeSpec) || 4901 state.getDeclarator().getContext() == 4902 DeclaratorContext::MemberContext; 4903 }; 4904 4905 if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) { 4906 LangAS ASIdx = LangAS::Default; 4907 // Take address space attr if any and mark as invalid to avoid adding 4908 // them later while creating QualType. 4909 if (FTI.MethodQualifiers) 4910 for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) { 4911 LangAS ASIdxNew = attr.asOpenCLLangAS(); 4912 if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew, 4913 attr.getLoc())) 4914 D.setInvalidType(true); 4915 else 4916 ASIdx = ASIdxNew; 4917 } 4918 // If a class member function's address space is not set, set it to 4919 // __generic. 4920 LangAS AS = 4921 (ASIdx == LangAS::Default ? LangAS::opencl_generic : ASIdx); 4922 EPI.TypeQuals.addAddressSpace(AS); 4923 } 4924 T = Context.getFunctionType(T, ParamTys, EPI); 4925 } 4926 break; 4927 } 4928 case DeclaratorChunk::MemberPointer: { 4929 // The scope spec must refer to a class, or be dependent. 4930 CXXScopeSpec &SS = DeclType.Mem.Scope(); 4931 QualType ClsType; 4932 4933 // Handle pointer nullability. 4934 inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc, 4935 DeclType.EndLoc, DeclType.getAttrs(), 4936 state.getDeclarator().getAttributePool()); 4937 4938 if (SS.isInvalid()) { 4939 // Avoid emitting extra errors if we already errored on the scope. 4940 D.setInvalidType(true); 4941 } else if (S.isDependentScopeSpecifier(SS) || 4942 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 4943 NestedNameSpecifier *NNS = SS.getScopeRep(); 4944 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 4945 switch (NNS->getKind()) { 4946 case NestedNameSpecifier::Identifier: 4947 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 4948 NNS->getAsIdentifier()); 4949 break; 4950 4951 case NestedNameSpecifier::Namespace: 4952 case NestedNameSpecifier::NamespaceAlias: 4953 case NestedNameSpecifier::Global: 4954 case NestedNameSpecifier::Super: 4955 llvm_unreachable("Nested-name-specifier must name a type"); 4956 4957 case NestedNameSpecifier::TypeSpec: 4958 case NestedNameSpecifier::TypeSpecWithTemplate: 4959 ClsType = QualType(NNS->getAsType(), 0); 4960 // Note: if the NNS has a prefix and ClsType is a nondependent 4961 // TemplateSpecializationType, then the NNS prefix is NOT included 4962 // in ClsType; hence we wrap ClsType into an ElaboratedType. 4963 // NOTE: in particular, no wrap occurs if ClsType already is an 4964 // Elaborated, DependentName, or DependentTemplateSpecialization. 4965 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 4966 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 4967 break; 4968 } 4969 } else { 4970 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 4971 diag::err_illegal_decl_mempointer_in_nonclass) 4972 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 4973 << DeclType.Mem.Scope().getRange(); 4974 D.setInvalidType(true); 4975 } 4976 4977 if (!ClsType.isNull()) 4978 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, 4979 D.getIdentifier()); 4980 if (T.isNull()) { 4981 T = Context.IntTy; 4982 D.setInvalidType(true); 4983 } else if (DeclType.Mem.TypeQuals) { 4984 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 4985 } 4986 break; 4987 } 4988 4989 case DeclaratorChunk::Pipe: { 4990 T = S.BuildReadPipeType(T, DeclType.Loc); 4991 processTypeAttrs(state, T, TAL_DeclSpec, 4992 D.getMutableDeclSpec().getAttributes()); 4993 break; 4994 } 4995 } 4996 4997 if (T.isNull()) { 4998 D.setInvalidType(true); 4999 T = Context.IntTy; 5000 } 5001 5002 // See if there are any attributes on this declarator chunk. 5003 processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs()); 5004 5005 if (DeclType.Kind != DeclaratorChunk::Paren) { 5006 if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType)) 5007 S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array); 5008 5009 ExpectNoDerefChunk = state.didParseNoDeref(); 5010 } 5011 } 5012 5013 if (ExpectNoDerefChunk) 5014 S.Diag(state.getDeclarator().getBeginLoc(), 5015 diag::warn_noderef_on_non_pointer_or_array); 5016 5017 // GNU warning -Wstrict-prototypes 5018 // Warn if a function declaration is without a prototype. 5019 // This warning is issued for all kinds of unprototyped function 5020 // declarations (i.e. function type typedef, function pointer etc.) 5021 // C99 6.7.5.3p14: 5022 // The empty list in a function declarator that is not part of a definition 5023 // of that function specifies that no information about the number or types 5024 // of the parameters is supplied. 5025 if (!LangOpts.CPlusPlus && D.getFunctionDefinitionKind() == FDK_Declaration) { 5026 bool IsBlock = false; 5027 for (const DeclaratorChunk &DeclType : D.type_objects()) { 5028 switch (DeclType.Kind) { 5029 case DeclaratorChunk::BlockPointer: 5030 IsBlock = true; 5031 break; 5032 case DeclaratorChunk::Function: { 5033 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 5034 // We supress the warning when there's no LParen location, as this 5035 // indicates the declaration was an implicit declaration, which gets 5036 // warned about separately via -Wimplicit-function-declaration. 5037 if (FTI.NumParams == 0 && !FTI.isVariadic && FTI.getLParenLoc().isValid()) 5038 S.Diag(DeclType.Loc, diag::warn_strict_prototypes) 5039 << IsBlock 5040 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void"); 5041 IsBlock = false; 5042 break; 5043 } 5044 default: 5045 break; 5046 } 5047 } 5048 } 5049 5050 assert(!T.isNull() && "T must not be null after this point"); 5051 5052 if (LangOpts.CPlusPlus && T->isFunctionType()) { 5053 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 5054 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 5055 5056 // C++ 8.3.5p4: 5057 // A cv-qualifier-seq shall only be part of the function type 5058 // for a nonstatic member function, the function type to which a pointer 5059 // to member refers, or the top-level function type of a function typedef 5060 // declaration. 5061 // 5062 // Core issue 547 also allows cv-qualifiers on function types that are 5063 // top-level template type arguments. 5064 enum { NonMember, Member, DeductionGuide } Kind = NonMember; 5065 if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName) 5066 Kind = DeductionGuide; 5067 else if (!D.getCXXScopeSpec().isSet()) { 5068 if ((D.getContext() == DeclaratorContext::MemberContext || 5069 D.getContext() == DeclaratorContext::LambdaExprContext) && 5070 !D.getDeclSpec().isFriendSpecified()) 5071 Kind = Member; 5072 } else { 5073 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 5074 if (!DC || DC->isRecord()) 5075 Kind = Member; 5076 } 5077 5078 // C++11 [dcl.fct]p6 (w/DR1417): 5079 // An attempt to specify a function type with a cv-qualifier-seq or a 5080 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 5081 // - the function type for a non-static member function, 5082 // - the function type to which a pointer to member refers, 5083 // - the top-level function type of a function typedef declaration or 5084 // alias-declaration, 5085 // - the type-id in the default argument of a type-parameter, or 5086 // - the type-id of a template-argument for a type-parameter 5087 // 5088 // FIXME: Checking this here is insufficient. We accept-invalid on: 5089 // 5090 // template<typename T> struct S { void f(T); }; 5091 // S<int() const> s; 5092 // 5093 // ... for instance. 5094 if (IsQualifiedFunction && 5095 !(Kind == Member && 5096 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 5097 !IsTypedefName && 5098 D.getContext() != DeclaratorContext::TemplateArgContext && 5099 D.getContext() != DeclaratorContext::TemplateTypeArgContext) { 5100 SourceLocation Loc = D.getBeginLoc(); 5101 SourceRange RemovalRange; 5102 unsigned I; 5103 if (D.isFunctionDeclarator(I)) { 5104 SmallVector<SourceLocation, 4> RemovalLocs; 5105 const DeclaratorChunk &Chunk = D.getTypeObject(I); 5106 assert(Chunk.Kind == DeclaratorChunk::Function); 5107 5108 if (Chunk.Fun.hasRefQualifier()) 5109 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 5110 5111 if (Chunk.Fun.hasMethodTypeQualifiers()) 5112 Chunk.Fun.MethodQualifiers->forEachQualifier( 5113 [&](DeclSpec::TQ TypeQual, StringRef QualName, 5114 SourceLocation SL) { RemovalLocs.push_back(SL); }); 5115 5116 if (!RemovalLocs.empty()) { 5117 llvm::sort(RemovalLocs, 5118 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 5119 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 5120 Loc = RemovalLocs.front(); 5121 } 5122 } 5123 5124 S.Diag(Loc, diag::err_invalid_qualified_function_type) 5125 << Kind << D.isFunctionDeclarator() << T 5126 << getFunctionQualifiersAsString(FnTy) 5127 << FixItHint::CreateRemoval(RemovalRange); 5128 5129 // Strip the cv-qualifiers and ref-qualifiers from the type. 5130 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 5131 EPI.TypeQuals.removeCVRQualifiers(); 5132 EPI.RefQualifier = RQ_None; 5133 5134 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(), 5135 EPI); 5136 // Rebuild any parens around the identifier in the function type. 5137 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 5138 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 5139 break; 5140 T = S.BuildParenType(T); 5141 } 5142 } 5143 } 5144 5145 // Apply any undistributed attributes from the declarator. 5146 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes()); 5147 5148 // Diagnose any ignored type attributes. 5149 state.diagnoseIgnoredTypeAttrs(T); 5150 5151 // C++0x [dcl.constexpr]p9: 5152 // A constexpr specifier used in an object declaration declares the object 5153 // as const. 5154 if (D.getDeclSpec().hasConstexprSpecifier() && T->isObjectType()) { 5155 T.addConst(); 5156 } 5157 5158 // If there was an ellipsis in the declarator, the declaration declares a 5159 // parameter pack whose type may be a pack expansion type. 5160 if (D.hasEllipsis()) { 5161 // C++0x [dcl.fct]p13: 5162 // A declarator-id or abstract-declarator containing an ellipsis shall 5163 // only be used in a parameter-declaration. Such a parameter-declaration 5164 // is a parameter pack (14.5.3). [...] 5165 switch (D.getContext()) { 5166 case DeclaratorContext::PrototypeContext: 5167 case DeclaratorContext::LambdaExprParameterContext: 5168 // C++0x [dcl.fct]p13: 5169 // [...] When it is part of a parameter-declaration-clause, the 5170 // parameter pack is a function parameter pack (14.5.3). The type T 5171 // of the declarator-id of the function parameter pack shall contain 5172 // a template parameter pack; each template parameter pack in T is 5173 // expanded by the function parameter pack. 5174 // 5175 // We represent function parameter packs as function parameters whose 5176 // type is a pack expansion. 5177 if (!T->containsUnexpandedParameterPack()) { 5178 S.Diag(D.getEllipsisLoc(), 5179 diag::err_function_parameter_pack_without_parameter_packs) 5180 << T << D.getSourceRange(); 5181 D.setEllipsisLoc(SourceLocation()); 5182 } else { 5183 T = Context.getPackExpansionType(T, None); 5184 } 5185 break; 5186 case DeclaratorContext::TemplateParamContext: 5187 // C++0x [temp.param]p15: 5188 // If a template-parameter is a [...] is a parameter-declaration that 5189 // declares a parameter pack (8.3.5), then the template-parameter is a 5190 // template parameter pack (14.5.3). 5191 // 5192 // Note: core issue 778 clarifies that, if there are any unexpanded 5193 // parameter packs in the type of the non-type template parameter, then 5194 // it expands those parameter packs. 5195 if (T->containsUnexpandedParameterPack()) 5196 T = Context.getPackExpansionType(T, None); 5197 else 5198 S.Diag(D.getEllipsisLoc(), 5199 LangOpts.CPlusPlus11 5200 ? diag::warn_cxx98_compat_variadic_templates 5201 : diag::ext_variadic_templates); 5202 break; 5203 5204 case DeclaratorContext::FileContext: 5205 case DeclaratorContext::KNRTypeListContext: 5206 case DeclaratorContext::ObjCParameterContext: // FIXME: special diagnostic 5207 // here? 5208 case DeclaratorContext::ObjCResultContext: // FIXME: special diagnostic 5209 // here? 5210 case DeclaratorContext::TypeNameContext: 5211 case DeclaratorContext::FunctionalCastContext: 5212 case DeclaratorContext::CXXNewContext: 5213 case DeclaratorContext::AliasDeclContext: 5214 case DeclaratorContext::AliasTemplateContext: 5215 case DeclaratorContext::MemberContext: 5216 case DeclaratorContext::BlockContext: 5217 case DeclaratorContext::ForContext: 5218 case DeclaratorContext::InitStmtContext: 5219 case DeclaratorContext::ConditionContext: 5220 case DeclaratorContext::CXXCatchContext: 5221 case DeclaratorContext::ObjCCatchContext: 5222 case DeclaratorContext::BlockLiteralContext: 5223 case DeclaratorContext::LambdaExprContext: 5224 case DeclaratorContext::ConversionIdContext: 5225 case DeclaratorContext::TrailingReturnContext: 5226 case DeclaratorContext::TrailingReturnVarContext: 5227 case DeclaratorContext::TemplateArgContext: 5228 case DeclaratorContext::TemplateTypeArgContext: 5229 // FIXME: We may want to allow parameter packs in block-literal contexts 5230 // in the future. 5231 S.Diag(D.getEllipsisLoc(), 5232 diag::err_ellipsis_in_declarator_not_parameter); 5233 D.setEllipsisLoc(SourceLocation()); 5234 break; 5235 } 5236 } 5237 5238 assert(!T.isNull() && "T must not be null at the end of this function"); 5239 if (D.isInvalidType()) 5240 return Context.getTrivialTypeSourceInfo(T); 5241 5242 return GetTypeSourceInfoForDeclarator(state, T, TInfo); 5243 } 5244 5245 /// GetTypeForDeclarator - Convert the type for the specified 5246 /// declarator to Type instances. 5247 /// 5248 /// The result of this call will never be null, but the associated 5249 /// type may be a null type if there's an unrecoverable error. 5250 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 5251 // Determine the type of the declarator. Not all forms of declarator 5252 // have a type. 5253 5254 TypeProcessingState state(*this, D); 5255 5256 TypeSourceInfo *ReturnTypeInfo = nullptr; 5257 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 5258 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 5259 inferARCWriteback(state, T); 5260 5261 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 5262 } 5263 5264 static void transferARCOwnershipToDeclSpec(Sema &S, 5265 QualType &declSpecTy, 5266 Qualifiers::ObjCLifetime ownership) { 5267 if (declSpecTy->isObjCRetainableType() && 5268 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 5269 Qualifiers qs; 5270 qs.addObjCLifetime(ownership); 5271 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 5272 } 5273 } 5274 5275 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 5276 Qualifiers::ObjCLifetime ownership, 5277 unsigned chunkIndex) { 5278 Sema &S = state.getSema(); 5279 Declarator &D = state.getDeclarator(); 5280 5281 // Look for an explicit lifetime attribute. 5282 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 5283 if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership)) 5284 return; 5285 5286 const char *attrStr = nullptr; 5287 switch (ownership) { 5288 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 5289 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 5290 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 5291 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 5292 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 5293 } 5294 5295 IdentifierLoc *Arg = new (S.Context) IdentifierLoc; 5296 Arg->Ident = &S.Context.Idents.get(attrStr); 5297 Arg->Loc = SourceLocation(); 5298 5299 ArgsUnion Args(Arg); 5300 5301 // If there wasn't one, add one (with an invalid source location 5302 // so that we don't make an AttributedType for it). 5303 ParsedAttr *attr = D.getAttributePool().create( 5304 &S.Context.Idents.get("objc_ownership"), SourceLocation(), 5305 /*scope*/ nullptr, SourceLocation(), 5306 /*args*/ &Args, 1, ParsedAttr::AS_GNU); 5307 chunk.getAttrs().addAtEnd(attr); 5308 // TODO: mark whether we did this inference? 5309 } 5310 5311 /// Used for transferring ownership in casts resulting in l-values. 5312 static void transferARCOwnership(TypeProcessingState &state, 5313 QualType &declSpecTy, 5314 Qualifiers::ObjCLifetime ownership) { 5315 Sema &S = state.getSema(); 5316 Declarator &D = state.getDeclarator(); 5317 5318 int inner = -1; 5319 bool hasIndirection = false; 5320 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 5321 DeclaratorChunk &chunk = D.getTypeObject(i); 5322 switch (chunk.Kind) { 5323 case DeclaratorChunk::Paren: 5324 // Ignore parens. 5325 break; 5326 5327 case DeclaratorChunk::Array: 5328 case DeclaratorChunk::Reference: 5329 case DeclaratorChunk::Pointer: 5330 if (inner != -1) 5331 hasIndirection = true; 5332 inner = i; 5333 break; 5334 5335 case DeclaratorChunk::BlockPointer: 5336 if (inner != -1) 5337 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 5338 return; 5339 5340 case DeclaratorChunk::Function: 5341 case DeclaratorChunk::MemberPointer: 5342 case DeclaratorChunk::Pipe: 5343 return; 5344 } 5345 } 5346 5347 if (inner == -1) 5348 return; 5349 5350 DeclaratorChunk &chunk = D.getTypeObject(inner); 5351 if (chunk.Kind == DeclaratorChunk::Pointer) { 5352 if (declSpecTy->isObjCRetainableType()) 5353 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 5354 if (declSpecTy->isObjCObjectType() && hasIndirection) 5355 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 5356 } else { 5357 assert(chunk.Kind == DeclaratorChunk::Array || 5358 chunk.Kind == DeclaratorChunk::Reference); 5359 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 5360 } 5361 } 5362 5363 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 5364 TypeProcessingState state(*this, D); 5365 5366 TypeSourceInfo *ReturnTypeInfo = nullptr; 5367 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 5368 5369 if (getLangOpts().ObjC) { 5370 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 5371 if (ownership != Qualifiers::OCL_None) 5372 transferARCOwnership(state, declSpecTy, ownership); 5373 } 5374 5375 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 5376 } 5377 5378 static void fillAttributedTypeLoc(AttributedTypeLoc TL, 5379 TypeProcessingState &State) { 5380 TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr())); 5381 } 5382 5383 namespace { 5384 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 5385 ASTContext &Context; 5386 TypeProcessingState &State; 5387 const DeclSpec &DS; 5388 5389 public: 5390 TypeSpecLocFiller(ASTContext &Context, TypeProcessingState &State, 5391 const DeclSpec &DS) 5392 : Context(Context), State(State), DS(DS) {} 5393 5394 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 5395 Visit(TL.getModifiedLoc()); 5396 fillAttributedTypeLoc(TL, State); 5397 } 5398 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) { 5399 Visit(TL.getInnerLoc()); 5400 TL.setExpansionLoc( 5401 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr())); 5402 } 5403 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 5404 Visit(TL.getUnqualifiedLoc()); 5405 } 5406 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 5407 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 5408 } 5409 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 5410 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 5411 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 5412 // addition field. What we have is good enough for dispay of location 5413 // of 'fixit' on interface name. 5414 TL.setNameEndLoc(DS.getEndLoc()); 5415 } 5416 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 5417 TypeSourceInfo *RepTInfo = nullptr; 5418 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo); 5419 TL.copy(RepTInfo->getTypeLoc()); 5420 } 5421 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 5422 TypeSourceInfo *RepTInfo = nullptr; 5423 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo); 5424 TL.copy(RepTInfo->getTypeLoc()); 5425 } 5426 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 5427 TypeSourceInfo *TInfo = nullptr; 5428 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5429 5430 // If we got no declarator info from previous Sema routines, 5431 // just fill with the typespec loc. 5432 if (!TInfo) { 5433 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 5434 return; 5435 } 5436 5437 TypeLoc OldTL = TInfo->getTypeLoc(); 5438 if (TInfo->getType()->getAs<ElaboratedType>()) { 5439 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 5440 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 5441 .castAs<TemplateSpecializationTypeLoc>(); 5442 TL.copy(NamedTL); 5443 } else { 5444 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 5445 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc()); 5446 } 5447 5448 } 5449 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 5450 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 5451 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 5452 TL.setParensRange(DS.getTypeofParensRange()); 5453 } 5454 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 5455 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 5456 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 5457 TL.setParensRange(DS.getTypeofParensRange()); 5458 assert(DS.getRepAsType()); 5459 TypeSourceInfo *TInfo = nullptr; 5460 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5461 TL.setUnderlyingTInfo(TInfo); 5462 } 5463 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 5464 // FIXME: This holds only because we only have one unary transform. 5465 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 5466 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 5467 TL.setParensRange(DS.getTypeofParensRange()); 5468 assert(DS.getRepAsType()); 5469 TypeSourceInfo *TInfo = nullptr; 5470 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5471 TL.setUnderlyingTInfo(TInfo); 5472 } 5473 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 5474 // By default, use the source location of the type specifier. 5475 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 5476 if (TL.needsExtraLocalData()) { 5477 // Set info for the written builtin specifiers. 5478 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 5479 // Try to have a meaningful source location. 5480 if (TL.getWrittenSignSpec() != TSS_unspecified) 5481 TL.expandBuiltinRange(DS.getTypeSpecSignLoc()); 5482 if (TL.getWrittenWidthSpec() != TSW_unspecified) 5483 TL.expandBuiltinRange(DS.getTypeSpecWidthRange()); 5484 } 5485 } 5486 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 5487 ElaboratedTypeKeyword Keyword 5488 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 5489 if (DS.getTypeSpecType() == TST_typename) { 5490 TypeSourceInfo *TInfo = nullptr; 5491 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5492 if (TInfo) { 5493 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 5494 return; 5495 } 5496 } 5497 TL.setElaboratedKeywordLoc(Keyword != ETK_None 5498 ? DS.getTypeSpecTypeLoc() 5499 : SourceLocation()); 5500 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 5501 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 5502 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 5503 } 5504 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 5505 assert(DS.getTypeSpecType() == TST_typename); 5506 TypeSourceInfo *TInfo = nullptr; 5507 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5508 assert(TInfo); 5509 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 5510 } 5511 void VisitDependentTemplateSpecializationTypeLoc( 5512 DependentTemplateSpecializationTypeLoc TL) { 5513 assert(DS.getTypeSpecType() == TST_typename); 5514 TypeSourceInfo *TInfo = nullptr; 5515 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5516 assert(TInfo); 5517 TL.copy( 5518 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 5519 } 5520 void VisitTagTypeLoc(TagTypeLoc TL) { 5521 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 5522 } 5523 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 5524 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier 5525 // or an _Atomic qualifier. 5526 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { 5527 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 5528 TL.setParensRange(DS.getTypeofParensRange()); 5529 5530 TypeSourceInfo *TInfo = nullptr; 5531 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5532 assert(TInfo); 5533 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 5534 } else { 5535 TL.setKWLoc(DS.getAtomicSpecLoc()); 5536 // No parens, to indicate this was spelled as an _Atomic qualifier. 5537 TL.setParensRange(SourceRange()); 5538 Visit(TL.getValueLoc()); 5539 } 5540 } 5541 5542 void VisitPipeTypeLoc(PipeTypeLoc TL) { 5543 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 5544 5545 TypeSourceInfo *TInfo = nullptr; 5546 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 5547 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 5548 } 5549 5550 void VisitTypeLoc(TypeLoc TL) { 5551 // FIXME: add other typespec types and change this to an assert. 5552 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 5553 } 5554 }; 5555 5556 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 5557 ASTContext &Context; 5558 TypeProcessingState &State; 5559 const DeclaratorChunk &Chunk; 5560 5561 public: 5562 DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State, 5563 const DeclaratorChunk &Chunk) 5564 : Context(Context), State(State), Chunk(Chunk) {} 5565 5566 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 5567 llvm_unreachable("qualified type locs not expected here!"); 5568 } 5569 void VisitDecayedTypeLoc(DecayedTypeLoc TL) { 5570 llvm_unreachable("decayed type locs not expected here!"); 5571 } 5572 5573 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 5574 fillAttributedTypeLoc(TL, State); 5575 } 5576 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) { 5577 // nothing 5578 } 5579 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 5580 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 5581 TL.setCaretLoc(Chunk.Loc); 5582 } 5583 void VisitPointerTypeLoc(PointerTypeLoc TL) { 5584 assert(Chunk.Kind == DeclaratorChunk::Pointer); 5585 TL.setStarLoc(Chunk.Loc); 5586 } 5587 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 5588 assert(Chunk.Kind == DeclaratorChunk::Pointer); 5589 TL.setStarLoc(Chunk.Loc); 5590 } 5591 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 5592 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 5593 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 5594 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 5595 5596 const Type* ClsTy = TL.getClass(); 5597 QualType ClsQT = QualType(ClsTy, 0); 5598 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 5599 // Now copy source location info into the type loc component. 5600 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 5601 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 5602 case NestedNameSpecifier::Identifier: 5603 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 5604 { 5605 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 5606 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 5607 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 5608 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 5609 } 5610 break; 5611 5612 case NestedNameSpecifier::TypeSpec: 5613 case NestedNameSpecifier::TypeSpecWithTemplate: 5614 if (isa<ElaboratedType>(ClsTy)) { 5615 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 5616 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 5617 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 5618 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 5619 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 5620 } else { 5621 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 5622 } 5623 break; 5624 5625 case NestedNameSpecifier::Namespace: 5626 case NestedNameSpecifier::NamespaceAlias: 5627 case NestedNameSpecifier::Global: 5628 case NestedNameSpecifier::Super: 5629 llvm_unreachable("Nested-name-specifier must name a type"); 5630 } 5631 5632 // Finally fill in MemberPointerLocInfo fields. 5633 TL.setStarLoc(Chunk.Loc); 5634 TL.setClassTInfo(ClsTInfo); 5635 } 5636 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 5637 assert(Chunk.Kind == DeclaratorChunk::Reference); 5638 // 'Amp' is misleading: this might have been originally 5639 /// spelled with AmpAmp. 5640 TL.setAmpLoc(Chunk.Loc); 5641 } 5642 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 5643 assert(Chunk.Kind == DeclaratorChunk::Reference); 5644 assert(!Chunk.Ref.LValueRef); 5645 TL.setAmpAmpLoc(Chunk.Loc); 5646 } 5647 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 5648 assert(Chunk.Kind == DeclaratorChunk::Array); 5649 TL.setLBracketLoc(Chunk.Loc); 5650 TL.setRBracketLoc(Chunk.EndLoc); 5651 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 5652 } 5653 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 5654 assert(Chunk.Kind == DeclaratorChunk::Function); 5655 TL.setLocalRangeBegin(Chunk.Loc); 5656 TL.setLocalRangeEnd(Chunk.EndLoc); 5657 5658 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 5659 TL.setLParenLoc(FTI.getLParenLoc()); 5660 TL.setRParenLoc(FTI.getRParenLoc()); 5661 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) { 5662 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param); 5663 TL.setParam(tpi++, Param); 5664 } 5665 TL.setExceptionSpecRange(FTI.getExceptionSpecRange()); 5666 } 5667 void VisitParenTypeLoc(ParenTypeLoc TL) { 5668 assert(Chunk.Kind == DeclaratorChunk::Paren); 5669 TL.setLParenLoc(Chunk.Loc); 5670 TL.setRParenLoc(Chunk.EndLoc); 5671 } 5672 void VisitPipeTypeLoc(PipeTypeLoc TL) { 5673 assert(Chunk.Kind == DeclaratorChunk::Pipe); 5674 TL.setKWLoc(Chunk.Loc); 5675 } 5676 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) { 5677 TL.setExpansionLoc(Chunk.Loc); 5678 } 5679 5680 void VisitTypeLoc(TypeLoc TL) { 5681 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 5682 } 5683 }; 5684 } // end anonymous namespace 5685 5686 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { 5687 SourceLocation Loc; 5688 switch (Chunk.Kind) { 5689 case DeclaratorChunk::Function: 5690 case DeclaratorChunk::Array: 5691 case DeclaratorChunk::Paren: 5692 case DeclaratorChunk::Pipe: 5693 llvm_unreachable("cannot be _Atomic qualified"); 5694 5695 case DeclaratorChunk::Pointer: 5696 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); 5697 break; 5698 5699 case DeclaratorChunk::BlockPointer: 5700 case DeclaratorChunk::Reference: 5701 case DeclaratorChunk::MemberPointer: 5702 // FIXME: Provide a source location for the _Atomic keyword. 5703 break; 5704 } 5705 5706 ATL.setKWLoc(Loc); 5707 ATL.setParensRange(SourceRange()); 5708 } 5709 5710 static void 5711 fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL, 5712 const ParsedAttributesView &Attrs) { 5713 for (const ParsedAttr &AL : Attrs) { 5714 if (AL.getKind() == ParsedAttr::AT_AddressSpace) { 5715 DASTL.setAttrNameLoc(AL.getLoc()); 5716 DASTL.setAttrExprOperand(AL.getArgAsExpr(0)); 5717 DASTL.setAttrOperandParensRange(SourceRange()); 5718 return; 5719 } 5720 } 5721 5722 llvm_unreachable( 5723 "no address_space attribute found at the expected location!"); 5724 } 5725 5726 /// Create and instantiate a TypeSourceInfo with type source information. 5727 /// 5728 /// \param T QualType referring to the type as written in source code. 5729 /// 5730 /// \param ReturnTypeInfo For declarators whose return type does not show 5731 /// up in the normal place in the declaration specifiers (such as a C++ 5732 /// conversion function), this pointer will refer to a type source information 5733 /// for that return type. 5734 static TypeSourceInfo * 5735 GetTypeSourceInfoForDeclarator(TypeProcessingState &State, 5736 QualType T, TypeSourceInfo *ReturnTypeInfo) { 5737 Sema &S = State.getSema(); 5738 Declarator &D = State.getDeclarator(); 5739 5740 TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T); 5741 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 5742 5743 // Handle parameter packs whose type is a pack expansion. 5744 if (isa<PackExpansionType>(T)) { 5745 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 5746 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 5747 } 5748 5749 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 5750 // An AtomicTypeLoc might be produced by an atomic qualifier in this 5751 // declarator chunk. 5752 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { 5753 fillAtomicQualLoc(ATL, D.getTypeObject(i)); 5754 CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); 5755 } 5756 5757 while (MacroQualifiedTypeLoc TL = CurrTL.getAs<MacroQualifiedTypeLoc>()) { 5758 TL.setExpansionLoc( 5759 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr())); 5760 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 5761 } 5762 5763 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 5764 fillAttributedTypeLoc(TL, State); 5765 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 5766 } 5767 5768 while (DependentAddressSpaceTypeLoc TL = 5769 CurrTL.getAs<DependentAddressSpaceTypeLoc>()) { 5770 fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs()); 5771 CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc(); 5772 } 5773 5774 // FIXME: Ordering here? 5775 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>()) 5776 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 5777 5778 DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL); 5779 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 5780 } 5781 5782 // If we have different source information for the return type, use 5783 // that. This really only applies to C++ conversion functions. 5784 if (ReturnTypeInfo) { 5785 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 5786 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 5787 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 5788 } else { 5789 TypeSpecLocFiller(S.Context, State, D.getDeclSpec()).Visit(CurrTL); 5790 } 5791 5792 return TInfo; 5793 } 5794 5795 /// Create a LocInfoType to hold the given QualType and TypeSourceInfo. 5796 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 5797 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 5798 // and Sema during declaration parsing. Try deallocating/caching them when 5799 // it's appropriate, instead of allocating them and keeping them around. 5800 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 5801 TypeAlignment); 5802 new (LocT) LocInfoType(T, TInfo); 5803 assert(LocT->getTypeClass() != T->getTypeClass() && 5804 "LocInfoType's TypeClass conflicts with an existing Type class"); 5805 return ParsedType::make(QualType(LocT, 0)); 5806 } 5807 5808 void LocInfoType::getAsStringInternal(std::string &Str, 5809 const PrintingPolicy &Policy) const { 5810 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 5811 " was used directly instead of getting the QualType through" 5812 " GetTypeFromParser"); 5813 } 5814 5815 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 5816 // C99 6.7.6: Type names have no identifier. This is already validated by 5817 // the parser. 5818 assert(D.getIdentifier() == nullptr && 5819 "Type name should have no identifier!"); 5820 5821 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5822 QualType T = TInfo->getType(); 5823 if (D.isInvalidType()) 5824 return true; 5825 5826 // Make sure there are no unused decl attributes on the declarator. 5827 // We don't want to do this for ObjC parameters because we're going 5828 // to apply them to the actual parameter declaration. 5829 // Likewise, we don't want to do this for alias declarations, because 5830 // we are actually going to build a declaration from this eventually. 5831 if (D.getContext() != DeclaratorContext::ObjCParameterContext && 5832 D.getContext() != DeclaratorContext::AliasDeclContext && 5833 D.getContext() != DeclaratorContext::AliasTemplateContext) 5834 checkUnusedDeclAttributes(D); 5835 5836 if (getLangOpts().CPlusPlus) { 5837 // Check that there are no default arguments (C++ only). 5838 CheckExtraCXXDefaultArguments(D); 5839 } 5840 5841 return CreateParsedType(T, TInfo); 5842 } 5843 5844 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 5845 QualType T = Context.getObjCInstanceType(); 5846 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 5847 return CreateParsedType(T, TInfo); 5848 } 5849 5850 //===----------------------------------------------------------------------===// 5851 // Type Attribute Processing 5852 //===----------------------------------------------------------------------===// 5853 5854 /// Build an AddressSpace index from a constant expression and diagnose any 5855 /// errors related to invalid address_spaces. Returns true on successfully 5856 /// building an AddressSpace index. 5857 static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx, 5858 const Expr *AddrSpace, 5859 SourceLocation AttrLoc) { 5860 if (!AddrSpace->isValueDependent()) { 5861 llvm::APSInt addrSpace(32); 5862 if (!AddrSpace->isIntegerConstantExpr(addrSpace, S.Context)) { 5863 S.Diag(AttrLoc, diag::err_attribute_argument_type) 5864 << "'address_space'" << AANT_ArgumentIntegerConstant 5865 << AddrSpace->getSourceRange(); 5866 return false; 5867 } 5868 5869 // Bounds checking. 5870 if (addrSpace.isSigned()) { 5871 if (addrSpace.isNegative()) { 5872 S.Diag(AttrLoc, diag::err_attribute_address_space_negative) 5873 << AddrSpace->getSourceRange(); 5874 return false; 5875 } 5876 addrSpace.setIsSigned(false); 5877 } 5878 5879 llvm::APSInt max(addrSpace.getBitWidth()); 5880 max = 5881 Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace; 5882 if (addrSpace > max) { 5883 S.Diag(AttrLoc, diag::err_attribute_address_space_too_high) 5884 << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange(); 5885 return false; 5886 } 5887 5888 ASIdx = 5889 getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue())); 5890 return true; 5891 } 5892 5893 // Default value for DependentAddressSpaceTypes 5894 ASIdx = LangAS::Default; 5895 return true; 5896 } 5897 5898 /// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression 5899 /// is uninstantiated. If instantiated it will apply the appropriate address 5900 /// space to the type. This function allows dependent template variables to be 5901 /// used in conjunction with the address_space attribute 5902 QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace, 5903 SourceLocation AttrLoc) { 5904 if (!AddrSpace->isValueDependent()) { 5905 if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx, 5906 AttrLoc)) 5907 return QualType(); 5908 5909 return Context.getAddrSpaceQualType(T, ASIdx); 5910 } 5911 5912 // A check with similar intentions as checking if a type already has an 5913 // address space except for on a dependent types, basically if the 5914 // current type is already a DependentAddressSpaceType then its already 5915 // lined up to have another address space on it and we can't have 5916 // multiple address spaces on the one pointer indirection 5917 if (T->getAs<DependentAddressSpaceType>()) { 5918 Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers); 5919 return QualType(); 5920 } 5921 5922 return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc); 5923 } 5924 5925 QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace, 5926 SourceLocation AttrLoc) { 5927 LangAS ASIdx; 5928 if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc)) 5929 return QualType(); 5930 return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc); 5931 } 5932 5933 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 5934 /// specified type. The attribute contains 1 argument, the id of the address 5935 /// space for the type. 5936 static void HandleAddressSpaceTypeAttribute(QualType &Type, 5937 const ParsedAttr &Attr, 5938 TypeProcessingState &State) { 5939 Sema &S = State.getSema(); 5940 5941 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 5942 // qualified by an address-space qualifier." 5943 if (Type->isFunctionType()) { 5944 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 5945 Attr.setInvalid(); 5946 return; 5947 } 5948 5949 LangAS ASIdx; 5950 if (Attr.getKind() == ParsedAttr::AT_AddressSpace) { 5951 5952 // Check the attribute arguments. 5953 if (Attr.getNumArgs() != 1) { 5954 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr 5955 << 1; 5956 Attr.setInvalid(); 5957 return; 5958 } 5959 5960 Expr *ASArgExpr; 5961 if (Attr.isArgIdent(0)) { 5962 // Special case where the argument is a template id. 5963 CXXScopeSpec SS; 5964 SourceLocation TemplateKWLoc; 5965 UnqualifiedId id; 5966 id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); 5967 5968 ExprResult AddrSpace = S.ActOnIdExpression( 5969 S.getCurScope(), SS, TemplateKWLoc, id, /*HasTrailingLParen=*/false, 5970 /*IsAddressOfOperand=*/false); 5971 if (AddrSpace.isInvalid()) 5972 return; 5973 5974 ASArgExpr = static_cast<Expr *>(AddrSpace.get()); 5975 } else { 5976 ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 5977 } 5978 5979 LangAS ASIdx; 5980 if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) { 5981 Attr.setInvalid(); 5982 return; 5983 } 5984 5985 ASTContext &Ctx = S.Context; 5986 auto *ASAttr = ::new (Ctx) AddressSpaceAttr( 5987 Attr.getRange(), Ctx, Attr.getAttributeSpellingListIndex(), 5988 static_cast<unsigned>(ASIdx)); 5989 5990 // If the expression is not value dependent (not templated), then we can 5991 // apply the address space qualifiers just to the equivalent type. 5992 // Otherwise, we make an AttributedType with the modified and equivalent 5993 // type the same, and wrap it in a DependentAddressSpaceType. When this 5994 // dependent type is resolved, the qualifier is added to the equivalent type 5995 // later. 5996 QualType T; 5997 if (!ASArgExpr->isValueDependent()) { 5998 QualType EquivType = 5999 S.BuildAddressSpaceAttr(Type, ASIdx, ASArgExpr, Attr.getLoc()); 6000 if (EquivType.isNull()) { 6001 Attr.setInvalid(); 6002 return; 6003 } 6004 T = State.getAttributedType(ASAttr, Type, EquivType); 6005 } else { 6006 T = State.getAttributedType(ASAttr, Type, Type); 6007 T = S.BuildAddressSpaceAttr(T, ASIdx, ASArgExpr, Attr.getLoc()); 6008 } 6009 6010 if (!T.isNull()) 6011 Type = T; 6012 else 6013 Attr.setInvalid(); 6014 } else { 6015 // The keyword-based type attributes imply which address space to use. 6016 ASIdx = Attr.asOpenCLLangAS(); 6017 if (ASIdx == LangAS::Default) 6018 llvm_unreachable("Invalid address space"); 6019 6020 if (DiagnoseMultipleAddrSpaceAttributes(S, Type.getAddressSpace(), ASIdx, 6021 Attr.getLoc())) { 6022 Attr.setInvalid(); 6023 return; 6024 } 6025 6026 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 6027 } 6028 } 6029 6030 /// Does this type have a "direct" ownership qualifier? That is, 6031 /// is it written like "__strong id", as opposed to something like 6032 /// "typeof(foo)", where that happens to be strong? 6033 static bool hasDirectOwnershipQualifier(QualType type) { 6034 // Fast path: no qualifier at all. 6035 assert(type.getQualifiers().hasObjCLifetime()); 6036 6037 while (true) { 6038 // __strong id 6039 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 6040 if (attr->getAttrKind() == attr::ObjCOwnership) 6041 return true; 6042 6043 type = attr->getModifiedType(); 6044 6045 // X *__strong (...) 6046 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 6047 type = paren->getInnerType(); 6048 6049 // That's it for things we want to complain about. In particular, 6050 // we do not want to look through typedefs, typeof(expr), 6051 // typeof(type), or any other way that the type is somehow 6052 // abstracted. 6053 } else { 6054 6055 return false; 6056 } 6057 } 6058 } 6059 6060 /// handleObjCOwnershipTypeAttr - Process an objc_ownership 6061 /// attribute on the specified type. 6062 /// 6063 /// Returns 'true' if the attribute was handled. 6064 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 6065 ParsedAttr &attr, QualType &type) { 6066 bool NonObjCPointer = false; 6067 6068 if (!type->isDependentType() && !type->isUndeducedType()) { 6069 if (const PointerType *ptr = type->getAs<PointerType>()) { 6070 QualType pointee = ptr->getPointeeType(); 6071 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 6072 return false; 6073 // It is important not to lose the source info that there was an attribute 6074 // applied to non-objc pointer. We will create an attributed type but 6075 // its type will be the same as the original type. 6076 NonObjCPointer = true; 6077 } else if (!type->isObjCRetainableType()) { 6078 return false; 6079 } 6080 6081 // Don't accept an ownership attribute in the declspec if it would 6082 // just be the return type of a block pointer. 6083 if (state.isProcessingDeclSpec()) { 6084 Declarator &D = state.getDeclarator(); 6085 if (maybeMovePastReturnType(D, D.getNumTypeObjects(), 6086 /*onlyBlockPointers=*/true)) 6087 return false; 6088 } 6089 } 6090 6091 Sema &S = state.getSema(); 6092 SourceLocation AttrLoc = attr.getLoc(); 6093 if (AttrLoc.isMacroID()) 6094 AttrLoc = 6095 S.getSourceManager().getImmediateExpansionRange(AttrLoc).getBegin(); 6096 6097 if (!attr.isArgIdent(0)) { 6098 S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr 6099 << AANT_ArgumentString; 6100 attr.setInvalid(); 6101 return true; 6102 } 6103 6104 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; 6105 Qualifiers::ObjCLifetime lifetime; 6106 if (II->isStr("none")) 6107 lifetime = Qualifiers::OCL_ExplicitNone; 6108 else if (II->isStr("strong")) 6109 lifetime = Qualifiers::OCL_Strong; 6110 else if (II->isStr("weak")) 6111 lifetime = Qualifiers::OCL_Weak; 6112 else if (II->isStr("autoreleasing")) 6113 lifetime = Qualifiers::OCL_Autoreleasing; 6114 else { 6115 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 6116 << attr.getName() << II; 6117 attr.setInvalid(); 6118 return true; 6119 } 6120 6121 // Just ignore lifetime attributes other than __weak and __unsafe_unretained 6122 // outside of ARC mode. 6123 if (!S.getLangOpts().ObjCAutoRefCount && 6124 lifetime != Qualifiers::OCL_Weak && 6125 lifetime != Qualifiers::OCL_ExplicitNone) { 6126 return true; 6127 } 6128 6129 SplitQualType underlyingType = type.split(); 6130 6131 // Check for redundant/conflicting ownership qualifiers. 6132 if (Qualifiers::ObjCLifetime previousLifetime 6133 = type.getQualifiers().getObjCLifetime()) { 6134 // If it's written directly, that's an error. 6135 if (hasDirectOwnershipQualifier(type)) { 6136 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 6137 << type; 6138 return true; 6139 } 6140 6141 // Otherwise, if the qualifiers actually conflict, pull sugar off 6142 // and remove the ObjCLifetime qualifiers. 6143 if (previousLifetime != lifetime) { 6144 // It's possible to have multiple local ObjCLifetime qualifiers. We 6145 // can't stop after we reach a type that is directly qualified. 6146 const Type *prevTy = nullptr; 6147 while (!prevTy || prevTy != underlyingType.Ty) { 6148 prevTy = underlyingType.Ty; 6149 underlyingType = underlyingType.getSingleStepDesugaredType(); 6150 } 6151 underlyingType.Quals.removeObjCLifetime(); 6152 } 6153 } 6154 6155 underlyingType.Quals.addObjCLifetime(lifetime); 6156 6157 if (NonObjCPointer) { 6158 StringRef name = attr.getName()->getName(); 6159 switch (lifetime) { 6160 case Qualifiers::OCL_None: 6161 case Qualifiers::OCL_ExplicitNone: 6162 break; 6163 case Qualifiers::OCL_Strong: name = "__strong"; break; 6164 case Qualifiers::OCL_Weak: name = "__weak"; break; 6165 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 6166 } 6167 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name 6168 << TDS_ObjCObjOrBlock << type; 6169 } 6170 6171 // Don't actually add the __unsafe_unretained qualifier in non-ARC files, 6172 // because having both 'T' and '__unsafe_unretained T' exist in the type 6173 // system causes unfortunate widespread consistency problems. (For example, 6174 // they're not considered compatible types, and we mangle them identicially 6175 // as template arguments.) These problems are all individually fixable, 6176 // but it's easier to just not add the qualifier and instead sniff it out 6177 // in specific places using isObjCInertUnsafeUnretainedType(). 6178 // 6179 // Doing this does means we miss some trivial consistency checks that 6180 // would've triggered in ARC, but that's better than trying to solve all 6181 // the coexistence problems with __unsafe_unretained. 6182 if (!S.getLangOpts().ObjCAutoRefCount && 6183 lifetime == Qualifiers::OCL_ExplicitNone) { 6184 type = state.getAttributedType( 6185 createSimpleAttr<ObjCInertUnsafeUnretainedAttr>(S.Context, attr), 6186 type, type); 6187 return true; 6188 } 6189 6190 QualType origType = type; 6191 if (!NonObjCPointer) 6192 type = S.Context.getQualifiedType(underlyingType); 6193 6194 // If we have a valid source location for the attribute, use an 6195 // AttributedType instead. 6196 if (AttrLoc.isValid()) { 6197 type = state.getAttributedType(::new (S.Context) ObjCOwnershipAttr( 6198 attr.getRange(), S.Context, II, 6199 attr.getAttributeSpellingListIndex()), 6200 origType, type); 6201 } 6202 6203 auto diagnoseOrDelay = [](Sema &S, SourceLocation loc, 6204 unsigned diagnostic, QualType type) { 6205 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 6206 S.DelayedDiagnostics.add( 6207 sema::DelayedDiagnostic::makeForbiddenType( 6208 S.getSourceManager().getExpansionLoc(loc), 6209 diagnostic, type, /*ignored*/ 0)); 6210 } else { 6211 S.Diag(loc, diagnostic); 6212 } 6213 }; 6214 6215 // Sometimes, __weak isn't allowed. 6216 if (lifetime == Qualifiers::OCL_Weak && 6217 !S.getLangOpts().ObjCWeak && !NonObjCPointer) { 6218 6219 // Use a specialized diagnostic if the runtime just doesn't support them. 6220 unsigned diagnostic = 6221 (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled 6222 : diag::err_arc_weak_no_runtime); 6223 6224 // In any case, delay the diagnostic until we know what we're parsing. 6225 diagnoseOrDelay(S, AttrLoc, diagnostic, type); 6226 6227 attr.setInvalid(); 6228 return true; 6229 } 6230 6231 // Forbid __weak for class objects marked as 6232 // objc_arc_weak_reference_unavailable 6233 if (lifetime == Qualifiers::OCL_Weak) { 6234 if (const ObjCObjectPointerType *ObjT = 6235 type->getAs<ObjCObjectPointerType>()) { 6236 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 6237 if (Class->isArcWeakrefUnavailable()) { 6238 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 6239 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 6240 diag::note_class_declared); 6241 } 6242 } 6243 } 6244 } 6245 6246 return true; 6247 } 6248 6249 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 6250 /// attribute on the specified type. Returns true to indicate that 6251 /// the attribute was handled, false to indicate that the type does 6252 /// not permit the attribute. 6253 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr, 6254 QualType &type) { 6255 Sema &S = state.getSema(); 6256 6257 // Delay if this isn't some kind of pointer. 6258 if (!type->isPointerType() && 6259 !type->isObjCObjectPointerType() && 6260 !type->isBlockPointerType()) 6261 return false; 6262 6263 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 6264 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 6265 attr.setInvalid(); 6266 return true; 6267 } 6268 6269 // Check the attribute arguments. 6270 if (!attr.isArgIdent(0)) { 6271 S.Diag(attr.getLoc(), diag::err_attribute_argument_type) 6272 << attr << AANT_ArgumentString; 6273 attr.setInvalid(); 6274 return true; 6275 } 6276 Qualifiers::GC GCAttr; 6277 if (attr.getNumArgs() > 1) { 6278 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr 6279 << 1; 6280 attr.setInvalid(); 6281 return true; 6282 } 6283 6284 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; 6285 if (II->isStr("weak")) 6286 GCAttr = Qualifiers::Weak; 6287 else if (II->isStr("strong")) 6288 GCAttr = Qualifiers::Strong; 6289 else { 6290 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 6291 << attr.getName() << II; 6292 attr.setInvalid(); 6293 return true; 6294 } 6295 6296 QualType origType = type; 6297 type = S.Context.getObjCGCQualType(origType, GCAttr); 6298 6299 // Make an attributed type to preserve the source information. 6300 if (attr.getLoc().isValid()) 6301 type = state.getAttributedType( 6302 ::new (S.Context) ObjCGCAttr(attr.getRange(), S.Context, II, 6303 attr.getAttributeSpellingListIndex()), 6304 origType, type); 6305 6306 return true; 6307 } 6308 6309 namespace { 6310 /// A helper class to unwrap a type down to a function for the 6311 /// purposes of applying attributes there. 6312 /// 6313 /// Use: 6314 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 6315 /// if (unwrapped.isFunctionType()) { 6316 /// const FunctionType *fn = unwrapped.get(); 6317 /// // change fn somehow 6318 /// T = unwrapped.wrap(fn); 6319 /// } 6320 struct FunctionTypeUnwrapper { 6321 enum WrapKind { 6322 Desugar, 6323 Attributed, 6324 Parens, 6325 Pointer, 6326 BlockPointer, 6327 Reference, 6328 MemberPointer, 6329 MacroQualified, 6330 }; 6331 6332 QualType Original; 6333 const FunctionType *Fn; 6334 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 6335 6336 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 6337 while (true) { 6338 const Type *Ty = T.getTypePtr(); 6339 if (isa<FunctionType>(Ty)) { 6340 Fn = cast<FunctionType>(Ty); 6341 return; 6342 } else if (isa<ParenType>(Ty)) { 6343 T = cast<ParenType>(Ty)->getInnerType(); 6344 Stack.push_back(Parens); 6345 } else if (isa<PointerType>(Ty)) { 6346 T = cast<PointerType>(Ty)->getPointeeType(); 6347 Stack.push_back(Pointer); 6348 } else if (isa<BlockPointerType>(Ty)) { 6349 T = cast<BlockPointerType>(Ty)->getPointeeType(); 6350 Stack.push_back(BlockPointer); 6351 } else if (isa<MemberPointerType>(Ty)) { 6352 T = cast<MemberPointerType>(Ty)->getPointeeType(); 6353 Stack.push_back(MemberPointer); 6354 } else if (isa<ReferenceType>(Ty)) { 6355 T = cast<ReferenceType>(Ty)->getPointeeType(); 6356 Stack.push_back(Reference); 6357 } else if (isa<AttributedType>(Ty)) { 6358 T = cast<AttributedType>(Ty)->getEquivalentType(); 6359 Stack.push_back(Attributed); 6360 } else if (isa<MacroQualifiedType>(Ty)) { 6361 T = cast<MacroQualifiedType>(Ty)->getUnderlyingType(); 6362 Stack.push_back(MacroQualified); 6363 } else { 6364 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 6365 if (Ty == DTy) { 6366 Fn = nullptr; 6367 return; 6368 } 6369 6370 T = QualType(DTy, 0); 6371 Stack.push_back(Desugar); 6372 } 6373 } 6374 } 6375 6376 bool isFunctionType() const { return (Fn != nullptr); } 6377 const FunctionType *get() const { return Fn; } 6378 6379 QualType wrap(Sema &S, const FunctionType *New) { 6380 // If T wasn't modified from the unwrapped type, do nothing. 6381 if (New == get()) return Original; 6382 6383 Fn = New; 6384 return wrap(S.Context, Original, 0); 6385 } 6386 6387 private: 6388 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 6389 if (I == Stack.size()) 6390 return C.getQualifiedType(Fn, Old.getQualifiers()); 6391 6392 // Build up the inner type, applying the qualifiers from the old 6393 // type to the new type. 6394 SplitQualType SplitOld = Old.split(); 6395 6396 // As a special case, tail-recurse if there are no qualifiers. 6397 if (SplitOld.Quals.empty()) 6398 return wrap(C, SplitOld.Ty, I); 6399 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 6400 } 6401 6402 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 6403 if (I == Stack.size()) return QualType(Fn, 0); 6404 6405 switch (static_cast<WrapKind>(Stack[I++])) { 6406 case Desugar: 6407 // This is the point at which we potentially lose source 6408 // information. 6409 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 6410 6411 case Attributed: 6412 return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I); 6413 6414 case Parens: { 6415 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 6416 return C.getParenType(New); 6417 } 6418 6419 case MacroQualified: 6420 return wrap(C, cast<MacroQualifiedType>(Old)->getUnderlyingType(), I); 6421 6422 case Pointer: { 6423 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 6424 return C.getPointerType(New); 6425 } 6426 6427 case BlockPointer: { 6428 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 6429 return C.getBlockPointerType(New); 6430 } 6431 6432 case MemberPointer: { 6433 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 6434 QualType New = wrap(C, OldMPT->getPointeeType(), I); 6435 return C.getMemberPointerType(New, OldMPT->getClass()); 6436 } 6437 6438 case Reference: { 6439 const ReferenceType *OldRef = cast<ReferenceType>(Old); 6440 QualType New = wrap(C, OldRef->getPointeeType(), I); 6441 if (isa<LValueReferenceType>(OldRef)) 6442 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 6443 else 6444 return C.getRValueReferenceType(New); 6445 } 6446 } 6447 6448 llvm_unreachable("unknown wrapping kind"); 6449 } 6450 }; 6451 } // end anonymous namespace 6452 6453 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State, 6454 ParsedAttr &PAttr, QualType &Type) { 6455 Sema &S = State.getSema(); 6456 6457 Attr *A; 6458 switch (PAttr.getKind()) { 6459 default: llvm_unreachable("Unknown attribute kind"); 6460 case ParsedAttr::AT_Ptr32: 6461 A = createSimpleAttr<Ptr32Attr>(S.Context, PAttr); 6462 break; 6463 case ParsedAttr::AT_Ptr64: 6464 A = createSimpleAttr<Ptr64Attr>(S.Context, PAttr); 6465 break; 6466 case ParsedAttr::AT_SPtr: 6467 A = createSimpleAttr<SPtrAttr>(S.Context, PAttr); 6468 break; 6469 case ParsedAttr::AT_UPtr: 6470 A = createSimpleAttr<UPtrAttr>(S.Context, PAttr); 6471 break; 6472 } 6473 6474 attr::Kind NewAttrKind = A->getKind(); 6475 QualType Desugared = Type; 6476 const AttributedType *AT = dyn_cast<AttributedType>(Type); 6477 while (AT) { 6478 attr::Kind CurAttrKind = AT->getAttrKind(); 6479 6480 // You cannot specify duplicate type attributes, so if the attribute has 6481 // already been applied, flag it. 6482 if (NewAttrKind == CurAttrKind) { 6483 S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) 6484 << PAttr.getName(); 6485 return true; 6486 } 6487 6488 // You cannot have both __sptr and __uptr on the same type, nor can you 6489 // have __ptr32 and __ptr64. 6490 if ((CurAttrKind == attr::Ptr32 && NewAttrKind == attr::Ptr64) || 6491 (CurAttrKind == attr::Ptr64 && NewAttrKind == attr::Ptr32)) { 6492 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible) 6493 << "'__ptr32'" << "'__ptr64'"; 6494 return true; 6495 } else if ((CurAttrKind == attr::SPtr && NewAttrKind == attr::UPtr) || 6496 (CurAttrKind == attr::UPtr && NewAttrKind == attr::SPtr)) { 6497 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible) 6498 << "'__sptr'" << "'__uptr'"; 6499 return true; 6500 } 6501 6502 Desugared = AT->getEquivalentType(); 6503 AT = dyn_cast<AttributedType>(Desugared); 6504 } 6505 6506 // Pointer type qualifiers can only operate on pointer types, but not 6507 // pointer-to-member types. 6508 // 6509 // FIXME: Should we really be disallowing this attribute if there is any 6510 // type sugar between it and the pointer (other than attributes)? Eg, this 6511 // disallows the attribute on a parenthesized pointer. 6512 // And if so, should we really allow *any* type attribute? 6513 if (!isa<PointerType>(Desugared)) { 6514 if (Type->isMemberPointerType()) 6515 S.Diag(PAttr.getLoc(), diag::err_attribute_no_member_pointers) << PAttr; 6516 else 6517 S.Diag(PAttr.getLoc(), diag::err_attribute_pointers_only) << PAttr << 0; 6518 return true; 6519 } 6520 6521 Type = State.getAttributedType(A, Type, Type); 6522 return false; 6523 } 6524 6525 /// Map a nullability attribute kind to a nullability kind. 6526 static NullabilityKind mapNullabilityAttrKind(ParsedAttr::Kind kind) { 6527 switch (kind) { 6528 case ParsedAttr::AT_TypeNonNull: 6529 return NullabilityKind::NonNull; 6530 6531 case ParsedAttr::AT_TypeNullable: 6532 return NullabilityKind::Nullable; 6533 6534 case ParsedAttr::AT_TypeNullUnspecified: 6535 return NullabilityKind::Unspecified; 6536 6537 default: 6538 llvm_unreachable("not a nullability attribute kind"); 6539 } 6540 } 6541 6542 /// Applies a nullability type specifier to the given type, if possible. 6543 /// 6544 /// \param state The type processing state. 6545 /// 6546 /// \param type The type to which the nullability specifier will be 6547 /// added. On success, this type will be updated appropriately. 6548 /// 6549 /// \param attr The attribute as written on the type. 6550 /// 6551 /// \param allowOnArrayType Whether to accept nullability specifiers on an 6552 /// array type (e.g., because it will decay to a pointer). 6553 /// 6554 /// \returns true if a problem has been diagnosed, false on success. 6555 static bool checkNullabilityTypeSpecifier(TypeProcessingState &state, 6556 QualType &type, 6557 ParsedAttr &attr, 6558 bool allowOnArrayType) { 6559 Sema &S = state.getSema(); 6560 6561 NullabilityKind nullability = mapNullabilityAttrKind(attr.getKind()); 6562 SourceLocation nullabilityLoc = attr.getLoc(); 6563 bool isContextSensitive = attr.isContextSensitiveKeywordAttribute(); 6564 6565 recordNullabilitySeen(S, nullabilityLoc); 6566 6567 // Check for existing nullability attributes on the type. 6568 QualType desugared = type; 6569 while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) { 6570 // Check whether there is already a null 6571 if (auto existingNullability = attributed->getImmediateNullability()) { 6572 // Duplicated nullability. 6573 if (nullability == *existingNullability) { 6574 S.Diag(nullabilityLoc, diag::warn_nullability_duplicate) 6575 << DiagNullabilityKind(nullability, isContextSensitive) 6576 << FixItHint::CreateRemoval(nullabilityLoc); 6577 6578 break; 6579 } 6580 6581 // Conflicting nullability. 6582 S.Diag(nullabilityLoc, diag::err_nullability_conflicting) 6583 << DiagNullabilityKind(nullability, isContextSensitive) 6584 << DiagNullabilityKind(*existingNullability, false); 6585 return true; 6586 } 6587 6588 desugared = attributed->getModifiedType(); 6589 } 6590 6591 // If there is already a different nullability specifier, complain. 6592 // This (unlike the code above) looks through typedefs that might 6593 // have nullability specifiers on them, which means we cannot 6594 // provide a useful Fix-It. 6595 if (auto existingNullability = desugared->getNullability(S.Context)) { 6596 if (nullability != *existingNullability) { 6597 S.Diag(nullabilityLoc, diag::err_nullability_conflicting) 6598 << DiagNullabilityKind(nullability, isContextSensitive) 6599 << DiagNullabilityKind(*existingNullability, false); 6600 6601 // Try to find the typedef with the existing nullability specifier. 6602 if (auto typedefType = desugared->getAs<TypedefType>()) { 6603 TypedefNameDecl *typedefDecl = typedefType->getDecl(); 6604 QualType underlyingType = typedefDecl->getUnderlyingType(); 6605 if (auto typedefNullability 6606 = AttributedType::stripOuterNullability(underlyingType)) { 6607 if (*typedefNullability == *existingNullability) { 6608 S.Diag(typedefDecl->getLocation(), diag::note_nullability_here) 6609 << DiagNullabilityKind(*existingNullability, false); 6610 } 6611 } 6612 } 6613 6614 return true; 6615 } 6616 } 6617 6618 // If this definitely isn't a pointer type, reject the specifier. 6619 if (!desugared->canHaveNullability() && 6620 !(allowOnArrayType && desugared->isArrayType())) { 6621 S.Diag(nullabilityLoc, diag::err_nullability_nonpointer) 6622 << DiagNullabilityKind(nullability, isContextSensitive) << type; 6623 return true; 6624 } 6625 6626 // For the context-sensitive keywords/Objective-C property 6627 // attributes, require that the type be a single-level pointer. 6628 if (isContextSensitive) { 6629 // Make sure that the pointee isn't itself a pointer type. 6630 const Type *pointeeType; 6631 if (desugared->isArrayType()) 6632 pointeeType = desugared->getArrayElementTypeNoTypeQual(); 6633 else 6634 pointeeType = desugared->getPointeeType().getTypePtr(); 6635 6636 if (pointeeType->isAnyPointerType() || 6637 pointeeType->isObjCObjectPointerType() || 6638 pointeeType->isMemberPointerType()) { 6639 S.Diag(nullabilityLoc, diag::err_nullability_cs_multilevel) 6640 << DiagNullabilityKind(nullability, true) 6641 << type; 6642 S.Diag(nullabilityLoc, diag::note_nullability_type_specifier) 6643 << DiagNullabilityKind(nullability, false) 6644 << type 6645 << FixItHint::CreateReplacement(nullabilityLoc, 6646 getNullabilitySpelling(nullability)); 6647 return true; 6648 } 6649 } 6650 6651 // Form the attributed type. 6652 type = state.getAttributedType( 6653 createNullabilityAttr(S.Context, attr, nullability), type, type); 6654 return false; 6655 } 6656 6657 /// Check the application of the Objective-C '__kindof' qualifier to 6658 /// the given type. 6659 static bool checkObjCKindOfType(TypeProcessingState &state, QualType &type, 6660 ParsedAttr &attr) { 6661 Sema &S = state.getSema(); 6662 6663 if (isa<ObjCTypeParamType>(type)) { 6664 // Build the attributed type to record where __kindof occurred. 6665 type = state.getAttributedType( 6666 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, type); 6667 return false; 6668 } 6669 6670 // Find out if it's an Objective-C object or object pointer type; 6671 const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>(); 6672 const ObjCObjectType *objType = ptrType ? ptrType->getObjectType() 6673 : type->getAs<ObjCObjectType>(); 6674 6675 // If not, we can't apply __kindof. 6676 if (!objType) { 6677 // FIXME: Handle dependent types that aren't yet object types. 6678 S.Diag(attr.getLoc(), diag::err_objc_kindof_nonobject) 6679 << type; 6680 return true; 6681 } 6682 6683 // Rebuild the "equivalent" type, which pushes __kindof down into 6684 // the object type. 6685 // There is no need to apply kindof on an unqualified id type. 6686 QualType equivType = S.Context.getObjCObjectType( 6687 objType->getBaseType(), objType->getTypeArgsAsWritten(), 6688 objType->getProtocols(), 6689 /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true); 6690 6691 // If we started with an object pointer type, rebuild it. 6692 if (ptrType) { 6693 equivType = S.Context.getObjCObjectPointerType(equivType); 6694 if (auto nullability = type->getNullability(S.Context)) { 6695 // We create a nullability attribute from the __kindof attribute. 6696 // Make sure that will make sense. 6697 assert(attr.getAttributeSpellingListIndex() == 0 && 6698 "multiple spellings for __kindof?"); 6699 Attr *A = createNullabilityAttr(S.Context, attr, *nullability); 6700 A->setImplicit(true); 6701 equivType = state.getAttributedType(A, equivType, equivType); 6702 } 6703 } 6704 6705 // Build the attributed type to record where __kindof occurred. 6706 type = state.getAttributedType( 6707 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, equivType); 6708 return false; 6709 } 6710 6711 /// Distribute a nullability type attribute that cannot be applied to 6712 /// the type specifier to a pointer, block pointer, or member pointer 6713 /// declarator, complaining if necessary. 6714 /// 6715 /// \returns true if the nullability annotation was distributed, false 6716 /// otherwise. 6717 static bool distributeNullabilityTypeAttr(TypeProcessingState &state, 6718 QualType type, ParsedAttr &attr) { 6719 Declarator &declarator = state.getDeclarator(); 6720 6721 /// Attempt to move the attribute to the specified chunk. 6722 auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool { 6723 // If there is already a nullability attribute there, don't add 6724 // one. 6725 if (hasNullabilityAttr(chunk.getAttrs())) 6726 return false; 6727 6728 // Complain about the nullability qualifier being in the wrong 6729 // place. 6730 enum { 6731 PK_Pointer, 6732 PK_BlockPointer, 6733 PK_MemberPointer, 6734 PK_FunctionPointer, 6735 PK_MemberFunctionPointer, 6736 } pointerKind 6737 = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer 6738 : PK_Pointer) 6739 : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer 6740 : inFunction? PK_MemberFunctionPointer : PK_MemberPointer; 6741 6742 auto diag = state.getSema().Diag(attr.getLoc(), 6743 diag::warn_nullability_declspec) 6744 << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()), 6745 attr.isContextSensitiveKeywordAttribute()) 6746 << type 6747 << static_cast<unsigned>(pointerKind); 6748 6749 // FIXME: MemberPointer chunks don't carry the location of the *. 6750 if (chunk.Kind != DeclaratorChunk::MemberPointer) { 6751 diag << FixItHint::CreateRemoval(attr.getLoc()) 6752 << FixItHint::CreateInsertion( 6753 state.getSema().getPreprocessor() 6754 .getLocForEndOfToken(chunk.Loc), 6755 " " + attr.getName()->getName().str() + " "); 6756 } 6757 6758 moveAttrFromListToList(attr, state.getCurrentAttributes(), 6759 chunk.getAttrs()); 6760 return true; 6761 }; 6762 6763 // Move it to the outermost pointer, member pointer, or block 6764 // pointer declarator. 6765 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 6766 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 6767 switch (chunk.Kind) { 6768 case DeclaratorChunk::Pointer: 6769 case DeclaratorChunk::BlockPointer: 6770 case DeclaratorChunk::MemberPointer: 6771 return moveToChunk(chunk, false); 6772 6773 case DeclaratorChunk::Paren: 6774 case DeclaratorChunk::Array: 6775 continue; 6776 6777 case DeclaratorChunk::Function: 6778 // Try to move past the return type to a function/block/member 6779 // function pointer. 6780 if (DeclaratorChunk *dest = maybeMovePastReturnType( 6781 declarator, i, 6782 /*onlyBlockPointers=*/false)) { 6783 return moveToChunk(*dest, true); 6784 } 6785 6786 return false; 6787 6788 // Don't walk through these. 6789 case DeclaratorChunk::Reference: 6790 case DeclaratorChunk::Pipe: 6791 return false; 6792 } 6793 } 6794 6795 return false; 6796 } 6797 6798 static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) { 6799 assert(!Attr.isInvalid()); 6800 switch (Attr.getKind()) { 6801 default: 6802 llvm_unreachable("not a calling convention attribute"); 6803 case ParsedAttr::AT_CDecl: 6804 return createSimpleAttr<CDeclAttr>(Ctx, Attr); 6805 case ParsedAttr::AT_FastCall: 6806 return createSimpleAttr<FastCallAttr>(Ctx, Attr); 6807 case ParsedAttr::AT_StdCall: 6808 return createSimpleAttr<StdCallAttr>(Ctx, Attr); 6809 case ParsedAttr::AT_ThisCall: 6810 return createSimpleAttr<ThisCallAttr>(Ctx, Attr); 6811 case ParsedAttr::AT_RegCall: 6812 return createSimpleAttr<RegCallAttr>(Ctx, Attr); 6813 case ParsedAttr::AT_Pascal: 6814 return createSimpleAttr<PascalAttr>(Ctx, Attr); 6815 case ParsedAttr::AT_SwiftCall: 6816 return createSimpleAttr<SwiftCallAttr>(Ctx, Attr); 6817 case ParsedAttr::AT_VectorCall: 6818 return createSimpleAttr<VectorCallAttr>(Ctx, Attr); 6819 case ParsedAttr::AT_AArch64VectorPcs: 6820 return createSimpleAttr<AArch64VectorPcsAttr>(Ctx, Attr); 6821 case ParsedAttr::AT_Pcs: { 6822 // The attribute may have had a fixit applied where we treated an 6823 // identifier as a string literal. The contents of the string are valid, 6824 // but the form may not be. 6825 StringRef Str; 6826 if (Attr.isArgExpr(0)) 6827 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString(); 6828 else 6829 Str = Attr.getArgAsIdent(0)->Ident->getName(); 6830 PcsAttr::PCSType Type; 6831 if (!PcsAttr::ConvertStrToPCSType(Str, Type)) 6832 llvm_unreachable("already validated the attribute"); 6833 return ::new (Ctx) PcsAttr(Attr.getRange(), Ctx, Type, 6834 Attr.getAttributeSpellingListIndex()); 6835 } 6836 case ParsedAttr::AT_IntelOclBicc: 6837 return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr); 6838 case ParsedAttr::AT_MSABI: 6839 return createSimpleAttr<MSABIAttr>(Ctx, Attr); 6840 case ParsedAttr::AT_SysVABI: 6841 return createSimpleAttr<SysVABIAttr>(Ctx, Attr); 6842 case ParsedAttr::AT_PreserveMost: 6843 return createSimpleAttr<PreserveMostAttr>(Ctx, Attr); 6844 case ParsedAttr::AT_PreserveAll: 6845 return createSimpleAttr<PreserveAllAttr>(Ctx, Attr); 6846 } 6847 llvm_unreachable("unexpected attribute kind!"); 6848 } 6849 6850 /// Process an individual function attribute. Returns true to 6851 /// indicate that the attribute was handled, false if it wasn't. 6852 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr, 6853 QualType &type) { 6854 Sema &S = state.getSema(); 6855 6856 FunctionTypeUnwrapper unwrapped(S, type); 6857 6858 if (attr.getKind() == ParsedAttr::AT_NoReturn) { 6859 if (S.CheckAttrNoArgs(attr)) 6860 return true; 6861 6862 // Delay if this is not a function type. 6863 if (!unwrapped.isFunctionType()) 6864 return false; 6865 6866 // Otherwise we can process right away. 6867 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 6868 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 6869 return true; 6870 } 6871 6872 // ns_returns_retained is not always a type attribute, but if we got 6873 // here, we're treating it as one right now. 6874 if (attr.getKind() == ParsedAttr::AT_NSReturnsRetained) { 6875 if (attr.getNumArgs()) return true; 6876 6877 // Delay if this is not a function type. 6878 if (!unwrapped.isFunctionType()) 6879 return false; 6880 6881 // Check whether the return type is reasonable. 6882 if (S.checkNSReturnsRetainedReturnType(attr.getLoc(), 6883 unwrapped.get()->getReturnType())) 6884 return true; 6885 6886 // Only actually change the underlying type in ARC builds. 6887 QualType origType = type; 6888 if (state.getSema().getLangOpts().ObjCAutoRefCount) { 6889 FunctionType::ExtInfo EI 6890 = unwrapped.get()->getExtInfo().withProducesResult(true); 6891 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 6892 } 6893 type = state.getAttributedType( 6894 createSimpleAttr<NSReturnsRetainedAttr>(S.Context, attr), 6895 origType, type); 6896 return true; 6897 } 6898 6899 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCallerSavedRegisters) { 6900 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr)) 6901 return true; 6902 6903 // Delay if this is not a function type. 6904 if (!unwrapped.isFunctionType()) 6905 return false; 6906 6907 FunctionType::ExtInfo EI = 6908 unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true); 6909 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 6910 return true; 6911 } 6912 6913 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCfCheck) { 6914 if (!S.getLangOpts().CFProtectionBranch) { 6915 S.Diag(attr.getLoc(), diag::warn_nocf_check_attribute_ignored); 6916 attr.setInvalid(); 6917 return true; 6918 } 6919 6920 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr)) 6921 return true; 6922 6923 // If this is not a function type, warning will be asserted by subject 6924 // check. 6925 if (!unwrapped.isFunctionType()) 6926 return true; 6927 6928 FunctionType::ExtInfo EI = 6929 unwrapped.get()->getExtInfo().withNoCfCheck(true); 6930 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 6931 return true; 6932 } 6933 6934 if (attr.getKind() == ParsedAttr::AT_Regparm) { 6935 unsigned value; 6936 if (S.CheckRegparmAttr(attr, value)) 6937 return true; 6938 6939 // Delay if this is not a function type. 6940 if (!unwrapped.isFunctionType()) 6941 return false; 6942 6943 // Diagnose regparm with fastcall. 6944 const FunctionType *fn = unwrapped.get(); 6945 CallingConv CC = fn->getCallConv(); 6946 if (CC == CC_X86FastCall) { 6947 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 6948 << FunctionType::getNameForCallConv(CC) 6949 << "regparm"; 6950 attr.setInvalid(); 6951 return true; 6952 } 6953 6954 FunctionType::ExtInfo EI = 6955 unwrapped.get()->getExtInfo().withRegParm(value); 6956 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 6957 return true; 6958 } 6959 6960 if (attr.getKind() == ParsedAttr::AT_NoThrow) { 6961 // Delay if this is not a function type. 6962 if (!unwrapped.isFunctionType()) 6963 return false; 6964 6965 if (S.CheckAttrNoArgs(attr)) { 6966 attr.setInvalid(); 6967 return true; 6968 } 6969 6970 // Otherwise we can process right away. 6971 auto *Proto = unwrapped.get()->castAs<FunctionProtoType>(); 6972 6973 // MSVC ignores nothrow if it is in conflict with an explicit exception 6974 // specification. 6975 if (Proto->hasExceptionSpec()) { 6976 switch (Proto->getExceptionSpecType()) { 6977 case EST_None: 6978 llvm_unreachable("This doesn't have an exception spec!"); 6979 6980 case EST_DynamicNone: 6981 case EST_BasicNoexcept: 6982 case EST_NoexceptTrue: 6983 case EST_NoThrow: 6984 // Exception spec doesn't conflict with nothrow, so don't warn. 6985 LLVM_FALLTHROUGH; 6986 case EST_Unparsed: 6987 case EST_Uninstantiated: 6988 case EST_DependentNoexcept: 6989 case EST_Unevaluated: 6990 // We don't have enough information to properly determine if there is a 6991 // conflict, so suppress the warning. 6992 break; 6993 case EST_Dynamic: 6994 case EST_MSAny: 6995 case EST_NoexceptFalse: 6996 S.Diag(attr.getLoc(), diag::warn_nothrow_attribute_ignored); 6997 break; 6998 } 6999 return true; 7000 } 7001 7002 type = unwrapped.wrap( 7003 S, S.Context 7004 .getFunctionTypeWithExceptionSpec( 7005 QualType{Proto, 0}, 7006 FunctionProtoType::ExceptionSpecInfo{EST_NoThrow}) 7007 ->getAs<FunctionType>()); 7008 return true; 7009 } 7010 7011 // Delay if the type didn't work out to a function. 7012 if (!unwrapped.isFunctionType()) return false; 7013 7014 // Otherwise, a calling convention. 7015 CallingConv CC; 7016 if (S.CheckCallingConvAttr(attr, CC)) 7017 return true; 7018 7019 const FunctionType *fn = unwrapped.get(); 7020 CallingConv CCOld = fn->getCallConv(); 7021 Attr *CCAttr = getCCTypeAttr(S.Context, attr); 7022 7023 if (CCOld != CC) { 7024 // Error out on when there's already an attribute on the type 7025 // and the CCs don't match. 7026 if (S.getCallingConvAttributedType(type)) { 7027 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 7028 << FunctionType::getNameForCallConv(CC) 7029 << FunctionType::getNameForCallConv(CCOld); 7030 attr.setInvalid(); 7031 return true; 7032 } 7033 } 7034 7035 // Diagnose use of variadic functions with calling conventions that 7036 // don't support them (e.g. because they're callee-cleanup). 7037 // We delay warning about this on unprototyped function declarations 7038 // until after redeclaration checking, just in case we pick up a 7039 // prototype that way. And apparently we also "delay" warning about 7040 // unprototyped function types in general, despite not necessarily having 7041 // much ability to diagnose it later. 7042 if (!supportsVariadicCall(CC)) { 7043 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn); 7044 if (FnP && FnP->isVariadic()) { 7045 // stdcall and fastcall are ignored with a warning for GCC and MS 7046 // compatibility. 7047 if (CC == CC_X86StdCall || CC == CC_X86FastCall) 7048 return S.Diag(attr.getLoc(), diag::warn_cconv_unsupported) 7049 << FunctionType::getNameForCallConv(CC) 7050 << (int)Sema::CallingConventionIgnoredReason::VariadicFunction; 7051 7052 attr.setInvalid(); 7053 return S.Diag(attr.getLoc(), diag::err_cconv_varargs) 7054 << FunctionType::getNameForCallConv(CC); 7055 } 7056 } 7057 7058 // Also diagnose fastcall with regparm. 7059 if (CC == CC_X86FastCall && fn->getHasRegParm()) { 7060 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 7061 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall); 7062 attr.setInvalid(); 7063 return true; 7064 } 7065 7066 // Modify the CC from the wrapped function type, wrap it all back, and then 7067 // wrap the whole thing in an AttributedType as written. The modified type 7068 // might have a different CC if we ignored the attribute. 7069 QualType Equivalent; 7070 if (CCOld == CC) { 7071 Equivalent = type; 7072 } else { 7073 auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 7074 Equivalent = 7075 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 7076 } 7077 type = state.getAttributedType(CCAttr, type, Equivalent); 7078 return true; 7079 } 7080 7081 bool Sema::hasExplicitCallingConv(QualType T) { 7082 const AttributedType *AT; 7083 7084 // Stop if we'd be stripping off a typedef sugar node to reach the 7085 // AttributedType. 7086 while ((AT = T->getAs<AttributedType>()) && 7087 AT->getAs<TypedefType>() == T->getAs<TypedefType>()) { 7088 if (AT->isCallingConv()) 7089 return true; 7090 T = AT->getModifiedType(); 7091 } 7092 return false; 7093 } 7094 7095 void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor, 7096 SourceLocation Loc) { 7097 FunctionTypeUnwrapper Unwrapped(*this, T); 7098 const FunctionType *FT = Unwrapped.get(); 7099 bool IsVariadic = (isa<FunctionProtoType>(FT) && 7100 cast<FunctionProtoType>(FT)->isVariadic()); 7101 CallingConv CurCC = FT->getCallConv(); 7102 CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic); 7103 7104 if (CurCC == ToCC) 7105 return; 7106 7107 // MS compiler ignores explicit calling convention attributes on structors. We 7108 // should do the same. 7109 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) { 7110 // Issue a warning on ignored calling convention -- except of __stdcall. 7111 // Again, this is what MS compiler does. 7112 if (CurCC != CC_X86StdCall) 7113 Diag(Loc, diag::warn_cconv_unsupported) 7114 << FunctionType::getNameForCallConv(CurCC) 7115 << (int)Sema::CallingConventionIgnoredReason::ConstructorDestructor; 7116 // Default adjustment. 7117 } else { 7118 // Only adjust types with the default convention. For example, on Windows 7119 // we should adjust a __cdecl type to __thiscall for instance methods, and a 7120 // __thiscall type to __cdecl for static methods. 7121 CallingConv DefaultCC = 7122 Context.getDefaultCallingConvention(IsVariadic, IsStatic); 7123 7124 if (CurCC != DefaultCC || DefaultCC == ToCC) 7125 return; 7126 7127 if (hasExplicitCallingConv(T)) 7128 return; 7129 } 7130 7131 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC)); 7132 QualType Wrapped = Unwrapped.wrap(*this, FT); 7133 T = Context.getAdjustedType(T, Wrapped); 7134 } 7135 7136 /// HandleVectorSizeAttribute - this attribute is only applicable to integral 7137 /// and float scalars, although arrays, pointers, and function return values are 7138 /// allowed in conjunction with this construct. Aggregates with this attribute 7139 /// are invalid, even if they are of the same size as a corresponding scalar. 7140 /// The raw attribute should contain precisely 1 argument, the vector size for 7141 /// the variable, measured in bytes. If curType and rawAttr are well formed, 7142 /// this routine will return a new vector type. 7143 static void HandleVectorSizeAttr(QualType &CurType, const ParsedAttr &Attr, 7144 Sema &S) { 7145 // Check the attribute arguments. 7146 if (Attr.getNumArgs() != 1) { 7147 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr 7148 << 1; 7149 Attr.setInvalid(); 7150 return; 7151 } 7152 7153 Expr *SizeExpr; 7154 // Special case where the argument is a template id. 7155 if (Attr.isArgIdent(0)) { 7156 CXXScopeSpec SS; 7157 SourceLocation TemplateKWLoc; 7158 UnqualifiedId Id; 7159 Id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); 7160 7161 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 7162 Id, /*HasTrailingLParen=*/false, 7163 /*IsAddressOfOperand=*/false); 7164 7165 if (Size.isInvalid()) 7166 return; 7167 SizeExpr = Size.get(); 7168 } else { 7169 SizeExpr = Attr.getArgAsExpr(0); 7170 } 7171 7172 QualType T = S.BuildVectorType(CurType, SizeExpr, Attr.getLoc()); 7173 if (!T.isNull()) 7174 CurType = T; 7175 else 7176 Attr.setInvalid(); 7177 } 7178 7179 /// Process the OpenCL-like ext_vector_type attribute when it occurs on 7180 /// a type. 7181 static void HandleExtVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr, 7182 Sema &S) { 7183 // check the attribute arguments. 7184 if (Attr.getNumArgs() != 1) { 7185 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr 7186 << 1; 7187 return; 7188 } 7189 7190 Expr *sizeExpr; 7191 7192 // Special case where the argument is a template id. 7193 if (Attr.isArgIdent(0)) { 7194 CXXScopeSpec SS; 7195 SourceLocation TemplateKWLoc; 7196 UnqualifiedId id; 7197 id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); 7198 7199 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 7200 id, /*HasTrailingLParen=*/false, 7201 /*IsAddressOfOperand=*/false); 7202 if (Size.isInvalid()) 7203 return; 7204 7205 sizeExpr = Size.get(); 7206 } else { 7207 sizeExpr = Attr.getArgAsExpr(0); 7208 } 7209 7210 // Create the vector type. 7211 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 7212 if (!T.isNull()) 7213 CurType = T; 7214 } 7215 7216 static bool isPermittedNeonBaseType(QualType &Ty, 7217 VectorType::VectorKind VecKind, Sema &S) { 7218 const BuiltinType *BTy = Ty->getAs<BuiltinType>(); 7219 if (!BTy) 7220 return false; 7221 7222 llvm::Triple Triple = S.Context.getTargetInfo().getTriple(); 7223 7224 // Signed poly is mathematically wrong, but has been baked into some ABIs by 7225 // now. 7226 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 || 7227 Triple.getArch() == llvm::Triple::aarch64_be; 7228 if (VecKind == VectorType::NeonPolyVector) { 7229 if (IsPolyUnsigned) { 7230 // AArch64 polynomial vectors are unsigned and support poly64. 7231 return BTy->getKind() == BuiltinType::UChar || 7232 BTy->getKind() == BuiltinType::UShort || 7233 BTy->getKind() == BuiltinType::ULong || 7234 BTy->getKind() == BuiltinType::ULongLong; 7235 } else { 7236 // AArch32 polynomial vector are signed. 7237 return BTy->getKind() == BuiltinType::SChar || 7238 BTy->getKind() == BuiltinType::Short; 7239 } 7240 } 7241 7242 // Non-polynomial vector types: the usual suspects are allowed, as well as 7243 // float64_t on AArch64. 7244 bool Is64Bit = Triple.getArch() == llvm::Triple::aarch64 || 7245 Triple.getArch() == llvm::Triple::aarch64_be; 7246 7247 if (Is64Bit && BTy->getKind() == BuiltinType::Double) 7248 return true; 7249 7250 return BTy->getKind() == BuiltinType::SChar || 7251 BTy->getKind() == BuiltinType::UChar || 7252 BTy->getKind() == BuiltinType::Short || 7253 BTy->getKind() == BuiltinType::UShort || 7254 BTy->getKind() == BuiltinType::Int || 7255 BTy->getKind() == BuiltinType::UInt || 7256 BTy->getKind() == BuiltinType::Long || 7257 BTy->getKind() == BuiltinType::ULong || 7258 BTy->getKind() == BuiltinType::LongLong || 7259 BTy->getKind() == BuiltinType::ULongLong || 7260 BTy->getKind() == BuiltinType::Float || 7261 BTy->getKind() == BuiltinType::Half; 7262 } 7263 7264 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and 7265 /// "neon_polyvector_type" attributes are used to create vector types that 7266 /// are mangled according to ARM's ABI. Otherwise, these types are identical 7267 /// to those created with the "vector_size" attribute. Unlike "vector_size" 7268 /// the argument to these Neon attributes is the number of vector elements, 7269 /// not the vector size in bytes. The vector width and element type must 7270 /// match one of the standard Neon vector types. 7271 static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr, 7272 Sema &S, VectorType::VectorKind VecKind) { 7273 // Target must have NEON 7274 if (!S.Context.getTargetInfo().hasFeature("neon")) { 7275 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr; 7276 Attr.setInvalid(); 7277 return; 7278 } 7279 // Check the attribute arguments. 7280 if (Attr.getNumArgs() != 1) { 7281 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr 7282 << 1; 7283 Attr.setInvalid(); 7284 return; 7285 } 7286 // The number of elements must be an ICE. 7287 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 7288 llvm::APSInt numEltsInt(32); 7289 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 7290 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 7291 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) 7292 << Attr << AANT_ArgumentIntegerConstant 7293 << numEltsExpr->getSourceRange(); 7294 Attr.setInvalid(); 7295 return; 7296 } 7297 // Only certain element types are supported for Neon vectors. 7298 if (!isPermittedNeonBaseType(CurType, VecKind, S)) { 7299 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 7300 Attr.setInvalid(); 7301 return; 7302 } 7303 7304 // The total size of the vector must be 64 or 128 bits. 7305 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 7306 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 7307 unsigned vecSize = typeSize * numElts; 7308 if (vecSize != 64 && vecSize != 128) { 7309 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 7310 Attr.setInvalid(); 7311 return; 7312 } 7313 7314 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 7315 } 7316 7317 /// Handle OpenCL Access Qualifier Attribute. 7318 static void HandleOpenCLAccessAttr(QualType &CurType, const ParsedAttr &Attr, 7319 Sema &S) { 7320 // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type. 7321 if (!(CurType->isImageType() || CurType->isPipeType())) { 7322 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier); 7323 Attr.setInvalid(); 7324 return; 7325 } 7326 7327 if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) { 7328 QualType BaseTy = TypedefTy->desugar(); 7329 7330 std::string PrevAccessQual; 7331 if (BaseTy->isPipeType()) { 7332 if (TypedefTy->getDecl()->hasAttr<OpenCLAccessAttr>()) { 7333 OpenCLAccessAttr *Attr = 7334 TypedefTy->getDecl()->getAttr<OpenCLAccessAttr>(); 7335 PrevAccessQual = Attr->getSpelling(); 7336 } else { 7337 PrevAccessQual = "read_only"; 7338 } 7339 } else if (const BuiltinType* ImgType = BaseTy->getAs<BuiltinType>()) { 7340 7341 switch (ImgType->getKind()) { 7342 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ 7343 case BuiltinType::Id: \ 7344 PrevAccessQual = #Access; \ 7345 break; 7346 #include "clang/Basic/OpenCLImageTypes.def" 7347 default: 7348 llvm_unreachable("Unable to find corresponding image type."); 7349 } 7350 } else { 7351 llvm_unreachable("unexpected type"); 7352 } 7353 StringRef AttrName = Attr.getName()->getName(); 7354 if (PrevAccessQual == AttrName.ltrim("_")) { 7355 // Duplicated qualifiers 7356 S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec) 7357 << AttrName << Attr.getRange(); 7358 } else { 7359 // Contradicting qualifiers 7360 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers); 7361 } 7362 7363 S.Diag(TypedefTy->getDecl()->getBeginLoc(), 7364 diag::note_opencl_typedef_access_qualifier) << PrevAccessQual; 7365 } else if (CurType->isPipeType()) { 7366 if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) { 7367 QualType ElemType = CurType->getAs<PipeType>()->getElementType(); 7368 CurType = S.Context.getWritePipeType(ElemType); 7369 } 7370 } 7371 } 7372 7373 static void deduceOpenCLImplicitAddrSpace(TypeProcessingState &State, 7374 QualType &T, TypeAttrLocation TAL) { 7375 Declarator &D = State.getDeclarator(); 7376 7377 // Handle the cases where address space should not be deduced. 7378 // 7379 // The pointee type of a pointer type is always deduced since a pointer always 7380 // points to some memory location which should has an address space. 7381 // 7382 // There are situations that at the point of certain declarations, the address 7383 // space may be unknown and better to be left as default. For example, when 7384 // defining a typedef or struct type, they are not associated with any 7385 // specific address space. Later on, they may be used with any address space 7386 // to declare a variable. 7387 // 7388 // The return value of a function is r-value, therefore should not have 7389 // address space. 7390 // 7391 // The void type does not occupy memory, therefore should not have address 7392 // space, except when it is used as a pointee type. 7393 // 7394 // Since LLVM assumes function type is in default address space, it should not 7395 // have address space. 7396 auto ChunkIndex = State.getCurrentChunkIndex(); 7397 bool IsPointee = 7398 ChunkIndex > 0 && 7399 (D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::Pointer || 7400 D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::Reference || 7401 D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::BlockPointer); 7402 // For pointers/references to arrays the next chunk is always an array 7403 // followed by any number of parentheses. 7404 if (!IsPointee && ChunkIndex > 1) { 7405 auto AdjustedCI = ChunkIndex - 1; 7406 if (D.getTypeObject(AdjustedCI).Kind == DeclaratorChunk::Array) 7407 AdjustedCI--; 7408 // Skip over all parentheses. 7409 while (AdjustedCI > 0 && 7410 D.getTypeObject(AdjustedCI).Kind == DeclaratorChunk::Paren) 7411 AdjustedCI--; 7412 if (D.getTypeObject(AdjustedCI).Kind == DeclaratorChunk::Pointer || 7413 D.getTypeObject(AdjustedCI).Kind == DeclaratorChunk::Reference) 7414 IsPointee = true; 7415 } 7416 bool IsFuncReturnType = 7417 ChunkIndex > 0 && 7418 D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::Function; 7419 bool IsFuncType = 7420 ChunkIndex < D.getNumTypeObjects() && 7421 D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function; 7422 if ( // Do not deduce addr space for function return type and function type, 7423 // otherwise it will fail some sema check. 7424 IsFuncReturnType || IsFuncType || 7425 // Do not deduce addr space for member types of struct, except the pointee 7426 // type of a pointer member type or static data members. 7427 (D.getContext() == DeclaratorContext::MemberContext && 7428 (!IsPointee && 7429 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)) || 7430 // Do not deduce addr space of non-pointee in type alias because it 7431 // doesn't define any object. 7432 (D.getContext() == DeclaratorContext::AliasDeclContext && !IsPointee) || 7433 // Do not deduce addr space for types used to define a typedef and the 7434 // typedef itself, except the pointee type of a pointer type which is used 7435 // to define the typedef. 7436 (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef && 7437 !IsPointee) || 7438 // Do not deduce addr space of the void type, e.g. in f(void), otherwise 7439 // it will fail some sema check. 7440 (T->isVoidType() && !IsPointee) || 7441 // Do not deduce addr spaces for dependent types because they might end 7442 // up instantiating to a type with an explicit address space qualifier. 7443 // Except for pointer or reference types because the addr space in 7444 // template argument can only belong to a pointee. 7445 (T->isDependentType() && !T->isPointerType() && !T->isReferenceType()) || 7446 // Do not deduce addr space of decltype because it will be taken from 7447 // its argument. 7448 T->isDecltypeType() || 7449 // OpenCL spec v2.0 s6.9.b: 7450 // The sampler type cannot be used with the __local and __global address 7451 // space qualifiers. 7452 // OpenCL spec v2.0 s6.13.14: 7453 // Samplers can also be declared as global constants in the program 7454 // source using the following syntax. 7455 // const sampler_t <sampler name> = <value> 7456 // In codegen, file-scope sampler type variable has special handing and 7457 // does not rely on address space qualifier. On the other hand, deducing 7458 // address space of const sampler file-scope variable as global address 7459 // space causes spurious diagnostic about __global address space 7460 // qualifier, therefore do not deduce address space of file-scope sampler 7461 // type variable. 7462 (D.getContext() == DeclaratorContext::FileContext && T->isSamplerT())) 7463 return; 7464 7465 LangAS ImpAddr = LangAS::Default; 7466 // Put OpenCL automatic variable in private address space. 7467 // OpenCL v1.2 s6.5: 7468 // The default address space name for arguments to a function in a 7469 // program, or local variables of a function is __private. All function 7470 // arguments shall be in the __private address space. 7471 if (State.getSema().getLangOpts().OpenCLVersion <= 120 && 7472 !State.getSema().getLangOpts().OpenCLCPlusPlus) { 7473 ImpAddr = LangAS::opencl_private; 7474 } else { 7475 // If address space is not set, OpenCL 2.0 defines non private default 7476 // address spaces for some cases: 7477 // OpenCL 2.0, section 6.5: 7478 // The address space for a variable at program scope or a static variable 7479 // inside a function can either be __global or __constant, but defaults to 7480 // __global if not specified. 7481 // (...) 7482 // Pointers that are declared without pointing to a named address space 7483 // point to the generic address space. 7484 if (IsPointee) { 7485 ImpAddr = LangAS::opencl_generic; 7486 } else { 7487 if (D.getContext() == DeclaratorContext::TemplateArgContext) { 7488 // Do not deduce address space for non-pointee type in template arg. 7489 } else if (D.getContext() == DeclaratorContext::FileContext) { 7490 ImpAddr = LangAS::opencl_global; 7491 } else { 7492 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static || 7493 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) { 7494 ImpAddr = LangAS::opencl_global; 7495 } else { 7496 ImpAddr = LangAS::opencl_private; 7497 } 7498 } 7499 } 7500 } 7501 T = State.getSema().Context.getAddrSpaceQualType(T, ImpAddr); 7502 } 7503 7504 static void HandleLifetimeBoundAttr(TypeProcessingState &State, 7505 QualType &CurType, 7506 ParsedAttr &Attr) { 7507 if (State.getDeclarator().isDeclarationOfFunction()) { 7508 CurType = State.getAttributedType( 7509 createSimpleAttr<LifetimeBoundAttr>(State.getSema().Context, Attr), 7510 CurType, CurType); 7511 } else { 7512 Attr.diagnoseAppertainsTo(State.getSema(), nullptr); 7513 } 7514 } 7515 7516 7517 static void processTypeAttrs(TypeProcessingState &state, QualType &type, 7518 TypeAttrLocation TAL, 7519 ParsedAttributesView &attrs) { 7520 // Scan through and apply attributes to this type where it makes sense. Some 7521 // attributes (such as __address_space__, __vector_size__, etc) apply to the 7522 // type, but others can be present in the type specifiers even though they 7523 // apply to the decl. Here we apply type attributes and ignore the rest. 7524 7525 // This loop modifies the list pretty frequently, but we still need to make 7526 // sure we visit every element once. Copy the attributes list, and iterate 7527 // over that. 7528 ParsedAttributesView AttrsCopy{attrs}; 7529 7530 state.setParsedNoDeref(false); 7531 7532 for (ParsedAttr &attr : AttrsCopy) { 7533 7534 // Skip attributes that were marked to be invalid. 7535 if (attr.isInvalid()) 7536 continue; 7537 7538 if (attr.isCXX11Attribute()) { 7539 // [[gnu::...]] attributes are treated as declaration attributes, so may 7540 // not appertain to a DeclaratorChunk. If we handle them as type 7541 // attributes, accept them in that position and diagnose the GCC 7542 // incompatibility. 7543 if (attr.isGNUScope()) { 7544 bool IsTypeAttr = attr.isTypeAttr(); 7545 if (TAL == TAL_DeclChunk) { 7546 state.getSema().Diag(attr.getLoc(), 7547 IsTypeAttr 7548 ? diag::warn_gcc_ignores_type_attr 7549 : diag::warn_cxx11_gnu_attribute_on_type) 7550 << attr.getName(); 7551 if (!IsTypeAttr) 7552 continue; 7553 } 7554 } else if (TAL != TAL_DeclChunk && 7555 attr.getKind() != ParsedAttr::AT_AddressSpace) { 7556 // Otherwise, only consider type processing for a C++11 attribute if 7557 // it's actually been applied to a type. 7558 // We also allow C++11 address_space attributes to pass through. 7559 continue; 7560 } 7561 } 7562 7563 // If this is an attribute we can handle, do so now, 7564 // otherwise, add it to the FnAttrs list for rechaining. 7565 switch (attr.getKind()) { 7566 default: 7567 // A C++11 attribute on a declarator chunk must appertain to a type. 7568 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 7569 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 7570 << attr; 7571 attr.setUsedAsTypeAttr(); 7572 } 7573 break; 7574 7575 case ParsedAttr::UnknownAttribute: 7576 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 7577 state.getSema().Diag(attr.getLoc(), 7578 diag::warn_unknown_attribute_ignored) 7579 << attr.getName(); 7580 break; 7581 7582 case ParsedAttr::IgnoredAttribute: 7583 break; 7584 7585 case ParsedAttr::AT_MayAlias: 7586 // FIXME: This attribute needs to actually be handled, but if we ignore 7587 // it it breaks large amounts of Linux software. 7588 attr.setUsedAsTypeAttr(); 7589 break; 7590 case ParsedAttr::AT_OpenCLPrivateAddressSpace: 7591 case ParsedAttr::AT_OpenCLGlobalAddressSpace: 7592 case ParsedAttr::AT_OpenCLLocalAddressSpace: 7593 case ParsedAttr::AT_OpenCLConstantAddressSpace: 7594 case ParsedAttr::AT_OpenCLGenericAddressSpace: 7595 case ParsedAttr::AT_AddressSpace: 7596 HandleAddressSpaceTypeAttribute(type, attr, state); 7597 attr.setUsedAsTypeAttr(); 7598 break; 7599 OBJC_POINTER_TYPE_ATTRS_CASELIST: 7600 if (!handleObjCPointerTypeAttr(state, attr, type)) 7601 distributeObjCPointerTypeAttr(state, attr, type); 7602 attr.setUsedAsTypeAttr(); 7603 break; 7604 case ParsedAttr::AT_VectorSize: 7605 HandleVectorSizeAttr(type, attr, state.getSema()); 7606 attr.setUsedAsTypeAttr(); 7607 break; 7608 case ParsedAttr::AT_ExtVectorType: 7609 HandleExtVectorTypeAttr(type, attr, state.getSema()); 7610 attr.setUsedAsTypeAttr(); 7611 break; 7612 case ParsedAttr::AT_NeonVectorType: 7613 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 7614 VectorType::NeonVector); 7615 attr.setUsedAsTypeAttr(); 7616 break; 7617 case ParsedAttr::AT_NeonPolyVectorType: 7618 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 7619 VectorType::NeonPolyVector); 7620 attr.setUsedAsTypeAttr(); 7621 break; 7622 case ParsedAttr::AT_OpenCLAccess: 7623 HandleOpenCLAccessAttr(type, attr, state.getSema()); 7624 attr.setUsedAsTypeAttr(); 7625 break; 7626 case ParsedAttr::AT_LifetimeBound: 7627 if (TAL == TAL_DeclChunk) 7628 HandleLifetimeBoundAttr(state, type, attr); 7629 break; 7630 7631 case ParsedAttr::AT_NoDeref: { 7632 ASTContext &Ctx = state.getSema().Context; 7633 type = state.getAttributedType(createSimpleAttr<NoDerefAttr>(Ctx, attr), 7634 type, type); 7635 attr.setUsedAsTypeAttr(); 7636 state.setParsedNoDeref(true); 7637 break; 7638 } 7639 7640 MS_TYPE_ATTRS_CASELIST: 7641 if (!handleMSPointerTypeQualifierAttr(state, attr, type)) 7642 attr.setUsedAsTypeAttr(); 7643 break; 7644 7645 7646 NULLABILITY_TYPE_ATTRS_CASELIST: 7647 // Either add nullability here or try to distribute it. We 7648 // don't want to distribute the nullability specifier past any 7649 // dependent type, because that complicates the user model. 7650 if (type->canHaveNullability() || type->isDependentType() || 7651 type->isArrayType() || 7652 !distributeNullabilityTypeAttr(state, type, attr)) { 7653 unsigned endIndex; 7654 if (TAL == TAL_DeclChunk) 7655 endIndex = state.getCurrentChunkIndex(); 7656 else 7657 endIndex = state.getDeclarator().getNumTypeObjects(); 7658 bool allowOnArrayType = 7659 state.getDeclarator().isPrototypeContext() && 7660 !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex); 7661 if (checkNullabilityTypeSpecifier( 7662 state, 7663 type, 7664 attr, 7665 allowOnArrayType)) { 7666 attr.setInvalid(); 7667 } 7668 7669 attr.setUsedAsTypeAttr(); 7670 } 7671 break; 7672 7673 case ParsedAttr::AT_ObjCKindOf: 7674 // '__kindof' must be part of the decl-specifiers. 7675 switch (TAL) { 7676 case TAL_DeclSpec: 7677 break; 7678 7679 case TAL_DeclChunk: 7680 case TAL_DeclName: 7681 state.getSema().Diag(attr.getLoc(), 7682 diag::err_objc_kindof_wrong_position) 7683 << FixItHint::CreateRemoval(attr.getLoc()) 7684 << FixItHint::CreateInsertion( 7685 state.getDeclarator().getDeclSpec().getBeginLoc(), 7686 "__kindof "); 7687 break; 7688 } 7689 7690 // Apply it regardless. 7691 if (checkObjCKindOfType(state, type, attr)) 7692 attr.setInvalid(); 7693 break; 7694 7695 case ParsedAttr::AT_NoThrow: 7696 // Exception Specifications aren't generally supported in C mode throughout 7697 // clang, so revert to attribute-based handling for C. 7698 if (!state.getSema().getLangOpts().CPlusPlus) 7699 break; 7700 LLVM_FALLTHROUGH; 7701 FUNCTION_TYPE_ATTRS_CASELIST: 7702 attr.setUsedAsTypeAttr(); 7703 7704 // Never process function type attributes as part of the 7705 // declaration-specifiers. 7706 if (TAL == TAL_DeclSpec) 7707 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 7708 7709 // Otherwise, handle the possible delays. 7710 else if (!handleFunctionTypeAttr(state, attr, type)) 7711 distributeFunctionTypeAttr(state, attr, type); 7712 break; 7713 } 7714 7715 // Handle attributes that are defined in a macro. We do not want this to be 7716 // applied to ObjC builtin attributes. 7717 if (isa<AttributedType>(type) && attr.hasMacroIdentifier() && 7718 !type.getQualifiers().hasObjCLifetime() && 7719 !type.getQualifiers().hasObjCGCAttr() && 7720 attr.getKind() != ParsedAttr::AT_ObjCGC && 7721 attr.getKind() != ParsedAttr::AT_ObjCOwnership) { 7722 const IdentifierInfo *MacroII = attr.getMacroIdentifier(); 7723 type = state.getSema().Context.getMacroQualifiedType(type, MacroII); 7724 state.setExpansionLocForMacroQualifiedType( 7725 cast<MacroQualifiedType>(type.getTypePtr()), 7726 attr.getMacroExpansionLoc()); 7727 } 7728 } 7729 7730 if (!state.getSema().getLangOpts().OpenCL || 7731 type.getAddressSpace() != LangAS::Default) 7732 return; 7733 7734 deduceOpenCLImplicitAddrSpace(state, type, TAL); 7735 } 7736 7737 void Sema::completeExprArrayBound(Expr *E) { 7738 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 7739 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 7740 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) { 7741 auto *Def = Var->getDefinition(); 7742 if (!Def) { 7743 SourceLocation PointOfInstantiation = E->getExprLoc(); 7744 InstantiateVariableDefinition(PointOfInstantiation, Var); 7745 Def = Var->getDefinition(); 7746 7747 // If we don't already have a point of instantiation, and we managed 7748 // to instantiate a definition, this is the point of instantiation. 7749 // Otherwise, we don't request an end-of-TU instantiation, so this is 7750 // not a point of instantiation. 7751 // FIXME: Is this really the right behavior? 7752 if (Var->getPointOfInstantiation().isInvalid() && Def) { 7753 assert(Var->getTemplateSpecializationKind() == 7754 TSK_ImplicitInstantiation && 7755 "explicit instantiation with no point of instantiation"); 7756 Var->setTemplateSpecializationKind( 7757 Var->getTemplateSpecializationKind(), PointOfInstantiation); 7758 } 7759 } 7760 7761 // Update the type to the definition's type both here and within the 7762 // expression. 7763 if (Def) { 7764 DRE->setDecl(Def); 7765 QualType T = Def->getType(); 7766 DRE->setType(T); 7767 // FIXME: Update the type on all intervening expressions. 7768 E->setType(T); 7769 } 7770 7771 // We still go on to try to complete the type independently, as it 7772 // may also require instantiations or diagnostics if it remains 7773 // incomplete. 7774 } 7775 } 7776 } 7777 } 7778 7779 /// Ensure that the type of the given expression is complete. 7780 /// 7781 /// This routine checks whether the expression \p E has a complete type. If the 7782 /// expression refers to an instantiable construct, that instantiation is 7783 /// performed as needed to complete its type. Furthermore 7784 /// Sema::RequireCompleteType is called for the expression's type (or in the 7785 /// case of a reference type, the referred-to type). 7786 /// 7787 /// \param E The expression whose type is required to be complete. 7788 /// \param Diagnoser The object that will emit a diagnostic if the type is 7789 /// incomplete. 7790 /// 7791 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 7792 /// otherwise. 7793 bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser) { 7794 QualType T = E->getType(); 7795 7796 // Incomplete array types may be completed by the initializer attached to 7797 // their definitions. For static data members of class templates and for 7798 // variable templates, we need to instantiate the definition to get this 7799 // initializer and complete the type. 7800 if (T->isIncompleteArrayType()) { 7801 completeExprArrayBound(E); 7802 T = E->getType(); 7803 } 7804 7805 // FIXME: Are there other cases which require instantiating something other 7806 // than the type to complete the type of an expression? 7807 7808 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 7809 } 7810 7811 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 7812 BoundTypeDiagnoser<> Diagnoser(DiagID); 7813 return RequireCompleteExprType(E, Diagnoser); 7814 } 7815 7816 /// Ensure that the type T is a complete type. 7817 /// 7818 /// This routine checks whether the type @p T is complete in any 7819 /// context where a complete type is required. If @p T is a complete 7820 /// type, returns false. If @p T is a class template specialization, 7821 /// this routine then attempts to perform class template 7822 /// instantiation. If instantiation fails, or if @p T is incomplete 7823 /// and cannot be completed, issues the diagnostic @p diag (giving it 7824 /// the type @p T) and returns true. 7825 /// 7826 /// @param Loc The location in the source that the incomplete type 7827 /// diagnostic should refer to. 7828 /// 7829 /// @param T The type that this routine is examining for completeness. 7830 /// 7831 /// @returns @c true if @p T is incomplete and a diagnostic was emitted, 7832 /// @c false otherwise. 7833 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 7834 TypeDiagnoser &Diagnoser) { 7835 if (RequireCompleteTypeImpl(Loc, T, &Diagnoser)) 7836 return true; 7837 if (const TagType *Tag = T->getAs<TagType>()) { 7838 if (!Tag->getDecl()->isCompleteDefinitionRequired()) { 7839 Tag->getDecl()->setCompleteDefinitionRequired(); 7840 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl()); 7841 } 7842 } 7843 return false; 7844 } 7845 7846 bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) { 7847 llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls; 7848 if (!Suggested) 7849 return false; 7850 7851 // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext 7852 // and isolate from other C++ specific checks. 7853 StructuralEquivalenceContext Ctx( 7854 D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls, 7855 StructuralEquivalenceKind::Default, 7856 false /*StrictTypeSpelling*/, true /*Complain*/, 7857 true /*ErrorOnTagTypeMismatch*/); 7858 return Ctx.IsEquivalent(D, Suggested); 7859 } 7860 7861 /// Determine whether there is any declaration of \p D that was ever a 7862 /// definition (perhaps before module merging) and is currently visible. 7863 /// \param D The definition of the entity. 7864 /// \param Suggested Filled in with the declaration that should be made visible 7865 /// in order to provide a definition of this entity. 7866 /// \param OnlyNeedComplete If \c true, we only need the type to be complete, 7867 /// not defined. This only matters for enums with a fixed underlying 7868 /// type, since in all other cases, a type is complete if and only if it 7869 /// is defined. 7870 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested, 7871 bool OnlyNeedComplete) { 7872 // Easy case: if we don't have modules, all declarations are visible. 7873 if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility) 7874 return true; 7875 7876 // If this definition was instantiated from a template, map back to the 7877 // pattern from which it was instantiated. 7878 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) { 7879 // We're in the middle of defining it; this definition should be treated 7880 // as visible. 7881 return true; 7882 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) { 7883 if (auto *Pattern = RD->getTemplateInstantiationPattern()) 7884 RD = Pattern; 7885 D = RD->getDefinition(); 7886 } else if (auto *ED = dyn_cast<EnumDecl>(D)) { 7887 if (auto *Pattern = ED->getTemplateInstantiationPattern()) 7888 ED = Pattern; 7889 if (OnlyNeedComplete && ED->isFixed()) { 7890 // If the enum has a fixed underlying type, and we're only looking for a 7891 // complete type (not a definition), any visible declaration of it will 7892 // do. 7893 *Suggested = nullptr; 7894 for (auto *Redecl : ED->redecls()) { 7895 if (isVisible(Redecl)) 7896 return true; 7897 if (Redecl->isThisDeclarationADefinition() || 7898 (Redecl->isCanonicalDecl() && !*Suggested)) 7899 *Suggested = Redecl; 7900 } 7901 return false; 7902 } 7903 D = ED->getDefinition(); 7904 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) { 7905 if (auto *Pattern = FD->getTemplateInstantiationPattern()) 7906 FD = Pattern; 7907 D = FD->getDefinition(); 7908 } else if (auto *VD = dyn_cast<VarDecl>(D)) { 7909 if (auto *Pattern = VD->getTemplateInstantiationPattern()) 7910 VD = Pattern; 7911 D = VD->getDefinition(); 7912 } 7913 assert(D && "missing definition for pattern of instantiated definition"); 7914 7915 *Suggested = D; 7916 7917 auto DefinitionIsVisible = [&] { 7918 // The (primary) definition might be in a visible module. 7919 if (isVisible(D)) 7920 return true; 7921 7922 // A visible module might have a merged definition instead. 7923 if (D->isModulePrivate() ? hasMergedDefinitionInCurrentModule(D) 7924 : hasVisibleMergedDefinition(D)) { 7925 if (CodeSynthesisContexts.empty() && 7926 !getLangOpts().ModulesLocalVisibility) { 7927 // Cache the fact that this definition is implicitly visible because 7928 // there is a visible merged definition. 7929 D->setVisibleDespiteOwningModule(); 7930 } 7931 return true; 7932 } 7933 7934 return false; 7935 }; 7936 7937 if (DefinitionIsVisible()) 7938 return true; 7939 7940 // The external source may have additional definitions of this entity that are 7941 // visible, so complete the redeclaration chain now and ask again. 7942 if (auto *Source = Context.getExternalSource()) { 7943 Source->CompleteRedeclChain(D); 7944 return DefinitionIsVisible(); 7945 } 7946 7947 return false; 7948 } 7949 7950 /// Locks in the inheritance model for the given class and all of its bases. 7951 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) { 7952 RD = RD->getMostRecentNonInjectedDecl(); 7953 if (!RD->hasAttr<MSInheritanceAttr>()) { 7954 MSInheritanceAttr::Spelling IM; 7955 7956 switch (S.MSPointerToMemberRepresentationMethod) { 7957 case LangOptions::PPTMK_BestCase: 7958 IM = RD->calculateInheritanceModel(); 7959 break; 7960 case LangOptions::PPTMK_FullGeneralitySingleInheritance: 7961 IM = MSInheritanceAttr::Keyword_single_inheritance; 7962 break; 7963 case LangOptions::PPTMK_FullGeneralityMultipleInheritance: 7964 IM = MSInheritanceAttr::Keyword_multiple_inheritance; 7965 break; 7966 case LangOptions::PPTMK_FullGeneralityVirtualInheritance: 7967 IM = MSInheritanceAttr::Keyword_unspecified_inheritance; 7968 break; 7969 } 7970 7971 RD->addAttr(MSInheritanceAttr::CreateImplicit( 7972 S.getASTContext(), IM, 7973 /*BestCase=*/S.MSPointerToMemberRepresentationMethod == 7974 LangOptions::PPTMK_BestCase, 7975 S.ImplicitMSInheritanceAttrLoc.isValid() 7976 ? S.ImplicitMSInheritanceAttrLoc 7977 : RD->getSourceRange())); 7978 S.Consumer.AssignInheritanceModel(RD); 7979 } 7980 } 7981 7982 /// The implementation of RequireCompleteType 7983 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T, 7984 TypeDiagnoser *Diagnoser) { 7985 // FIXME: Add this assertion to make sure we always get instantiation points. 7986 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 7987 // FIXME: Add this assertion to help us flush out problems with 7988 // checking for dependent types and type-dependent expressions. 7989 // 7990 // assert(!T->isDependentType() && 7991 // "Can't ask whether a dependent type is complete"); 7992 7993 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) { 7994 if (!MPTy->getClass()->isDependentType()) { 7995 if (getLangOpts().CompleteMemberPointers && 7996 !MPTy->getClass()->getAsCXXRecordDecl()->isBeingDefined() && 7997 RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), 7998 diag::err_memptr_incomplete)) 7999 return true; 8000 8001 // We lock in the inheritance model once somebody has asked us to ensure 8002 // that a pointer-to-member type is complete. 8003 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { 8004 (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0)); 8005 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl()); 8006 } 8007 } 8008 } 8009 8010 NamedDecl *Def = nullptr; 8011 bool Incomplete = T->isIncompleteType(&Def); 8012 8013 // Check that any necessary explicit specializations are visible. For an 8014 // enum, we just need the declaration, so don't check this. 8015 if (Def && !isa<EnumDecl>(Def)) 8016 checkSpecializationVisibility(Loc, Def); 8017 8018 // If we have a complete type, we're done. 8019 if (!Incomplete) { 8020 // If we know about the definition but it is not visible, complain. 8021 NamedDecl *SuggestedDef = nullptr; 8022 if (Def && 8023 !hasVisibleDefinition(Def, &SuggestedDef, /*OnlyNeedComplete*/true)) { 8024 // If the user is going to see an error here, recover by making the 8025 // definition visible. 8026 bool TreatAsComplete = Diagnoser && !isSFINAEContext(); 8027 if (Diagnoser && SuggestedDef) 8028 diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition, 8029 /*Recover*/TreatAsComplete); 8030 return !TreatAsComplete; 8031 } else if (Def && !TemplateInstCallbacks.empty()) { 8032 CodeSynthesisContext TempInst; 8033 TempInst.Kind = CodeSynthesisContext::Memoization; 8034 TempInst.Template = Def; 8035 TempInst.Entity = Def; 8036 TempInst.PointOfInstantiation = Loc; 8037 atTemplateBegin(TemplateInstCallbacks, *this, TempInst); 8038 atTemplateEnd(TemplateInstCallbacks, *this, TempInst); 8039 } 8040 8041 return false; 8042 } 8043 8044 TagDecl *Tag = dyn_cast_or_null<TagDecl>(Def); 8045 ObjCInterfaceDecl *IFace = dyn_cast_or_null<ObjCInterfaceDecl>(Def); 8046 8047 // Give the external source a chance to provide a definition of the type. 8048 // This is kept separate from completing the redeclaration chain so that 8049 // external sources such as LLDB can avoid synthesizing a type definition 8050 // unless it's actually needed. 8051 if (Tag || IFace) { 8052 // Avoid diagnosing invalid decls as incomplete. 8053 if (Def->isInvalidDecl()) 8054 return true; 8055 8056 // Give the external AST source a chance to complete the type. 8057 if (auto *Source = Context.getExternalSource()) { 8058 if (Tag && Tag->hasExternalLexicalStorage()) 8059 Source->CompleteType(Tag); 8060 if (IFace && IFace->hasExternalLexicalStorage()) 8061 Source->CompleteType(IFace); 8062 // If the external source completed the type, go through the motions 8063 // again to ensure we're allowed to use the completed type. 8064 if (!T->isIncompleteType()) 8065 return RequireCompleteTypeImpl(Loc, T, Diagnoser); 8066 } 8067 } 8068 8069 // If we have a class template specialization or a class member of a 8070 // class template specialization, or an array with known size of such, 8071 // try to instantiate it. 8072 if (auto *RD = dyn_cast_or_null<CXXRecordDecl>(Tag)) { 8073 bool Instantiated = false; 8074 bool Diagnosed = false; 8075 if (RD->isDependentContext()) { 8076 // Don't try to instantiate a dependent class (eg, a member template of 8077 // an instantiated class template specialization). 8078 // FIXME: Can this ever happen? 8079 } else if (auto *ClassTemplateSpec = 8080 dyn_cast<ClassTemplateSpecializationDecl>(RD)) { 8081 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 8082 Diagnosed = InstantiateClassTemplateSpecialization( 8083 Loc, ClassTemplateSpec, TSK_ImplicitInstantiation, 8084 /*Complain=*/Diagnoser); 8085 Instantiated = true; 8086 } 8087 } else { 8088 CXXRecordDecl *Pattern = RD->getInstantiatedFromMemberClass(); 8089 if (!RD->isBeingDefined() && Pattern) { 8090 MemberSpecializationInfo *MSI = RD->getMemberSpecializationInfo(); 8091 assert(MSI && "Missing member specialization information?"); 8092 // This record was instantiated from a class within a template. 8093 if (MSI->getTemplateSpecializationKind() != 8094 TSK_ExplicitSpecialization) { 8095 Diagnosed = InstantiateClass(Loc, RD, Pattern, 8096 getTemplateInstantiationArgs(RD), 8097 TSK_ImplicitInstantiation, 8098 /*Complain=*/Diagnoser); 8099 Instantiated = true; 8100 } 8101 } 8102 } 8103 8104 if (Instantiated) { 8105 // Instantiate* might have already complained that the template is not 8106 // defined, if we asked it to. 8107 if (Diagnoser && Diagnosed) 8108 return true; 8109 // If we instantiated a definition, check that it's usable, even if 8110 // instantiation produced an error, so that repeated calls to this 8111 // function give consistent answers. 8112 if (!T->isIncompleteType()) 8113 return RequireCompleteTypeImpl(Loc, T, Diagnoser); 8114 } 8115 } 8116 8117 // FIXME: If we didn't instantiate a definition because of an explicit 8118 // specialization declaration, check that it's visible. 8119 8120 if (!Diagnoser) 8121 return true; 8122 8123 Diagnoser->diagnose(*this, Loc, T); 8124 8125 // If the type was a forward declaration of a class/struct/union 8126 // type, produce a note. 8127 if (Tag && !Tag->isInvalidDecl()) 8128 Diag(Tag->getLocation(), 8129 Tag->isBeingDefined() ? diag::note_type_being_defined 8130 : diag::note_forward_declaration) 8131 << Context.getTagDeclType(Tag); 8132 8133 // If the Objective-C class was a forward declaration, produce a note. 8134 if (IFace && !IFace->isInvalidDecl()) 8135 Diag(IFace->getLocation(), diag::note_forward_class); 8136 8137 // If we have external information that we can use to suggest a fix, 8138 // produce a note. 8139 if (ExternalSource) 8140 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T); 8141 8142 return true; 8143 } 8144 8145 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 8146 unsigned DiagID) { 8147 BoundTypeDiagnoser<> Diagnoser(DiagID); 8148 return RequireCompleteType(Loc, T, Diagnoser); 8149 } 8150 8151 /// Get diagnostic %select index for tag kind for 8152 /// literal type diagnostic message. 8153 /// WARNING: Indexes apply to particular diagnostics only! 8154 /// 8155 /// \returns diagnostic %select index. 8156 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 8157 switch (Tag) { 8158 case TTK_Struct: return 0; 8159 case TTK_Interface: return 1; 8160 case TTK_Class: return 2; 8161 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 8162 } 8163 } 8164 8165 /// Ensure that the type T is a literal type. 8166 /// 8167 /// This routine checks whether the type @p T is a literal type. If @p T is an 8168 /// incomplete type, an attempt is made to complete it. If @p T is a literal 8169 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 8170 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 8171 /// it the type @p T), along with notes explaining why the type is not a 8172 /// literal type, and returns true. 8173 /// 8174 /// @param Loc The location in the source that the non-literal type 8175 /// diagnostic should refer to. 8176 /// 8177 /// @param T The type that this routine is examining for literalness. 8178 /// 8179 /// @param Diagnoser Emits a diagnostic if T is not a literal type. 8180 /// 8181 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 8182 /// @c false otherwise. 8183 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 8184 TypeDiagnoser &Diagnoser) { 8185 assert(!T->isDependentType() && "type should not be dependent"); 8186 8187 QualType ElemType = Context.getBaseElementType(T); 8188 if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) && 8189 T->isLiteralType(Context)) 8190 return false; 8191 8192 Diagnoser.diagnose(*this, Loc, T); 8193 8194 if (T->isVariableArrayType()) 8195 return true; 8196 8197 const RecordType *RT = ElemType->getAs<RecordType>(); 8198 if (!RT) 8199 return true; 8200 8201 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 8202 8203 // A partially-defined class type can't be a literal type, because a literal 8204 // class type must have a trivial destructor (which can't be checked until 8205 // the class definition is complete). 8206 if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T)) 8207 return true; 8208 8209 // [expr.prim.lambda]p3: 8210 // This class type is [not] a literal type. 8211 if (RD->isLambda() && !getLangOpts().CPlusPlus17) { 8212 Diag(RD->getLocation(), diag::note_non_literal_lambda); 8213 return true; 8214 } 8215 8216 // If the class has virtual base classes, then it's not an aggregate, and 8217 // cannot have any constexpr constructors or a trivial default constructor, 8218 // so is non-literal. This is better to diagnose than the resulting absence 8219 // of constexpr constructors. 8220 if (RD->getNumVBases()) { 8221 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 8222 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 8223 for (const auto &I : RD->vbases()) 8224 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) 8225 << I.getSourceRange(); 8226 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 8227 !RD->hasTrivialDefaultConstructor()) { 8228 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 8229 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 8230 for (const auto &I : RD->bases()) { 8231 if (!I.getType()->isLiteralType(Context)) { 8232 Diag(I.getBeginLoc(), diag::note_non_literal_base_class) 8233 << RD << I.getType() << I.getSourceRange(); 8234 return true; 8235 } 8236 } 8237 for (const auto *I : RD->fields()) { 8238 if (!I->getType()->isLiteralType(Context) || 8239 I->getType().isVolatileQualified()) { 8240 Diag(I->getLocation(), diag::note_non_literal_field) 8241 << RD << I << I->getType() 8242 << I->getType().isVolatileQualified(); 8243 return true; 8244 } 8245 } 8246 } else if (!RD->hasTrivialDestructor()) { 8247 // All fields and bases are of literal types, so have trivial destructors. 8248 // If this class's destructor is non-trivial it must be user-declared. 8249 CXXDestructorDecl *Dtor = RD->getDestructor(); 8250 assert(Dtor && "class has literal fields and bases but no dtor?"); 8251 if (!Dtor) 8252 return true; 8253 8254 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 8255 diag::note_non_literal_user_provided_dtor : 8256 diag::note_non_literal_nontrivial_dtor) << RD; 8257 if (!Dtor->isUserProvided()) 8258 SpecialMemberIsTrivial(Dtor, CXXDestructor, TAH_IgnoreTrivialABI, 8259 /*Diagnose*/true); 8260 } 8261 8262 return true; 8263 } 8264 8265 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 8266 BoundTypeDiagnoser<> Diagnoser(DiagID); 8267 return RequireLiteralType(Loc, T, Diagnoser); 8268 } 8269 8270 /// Retrieve a version of the type 'T' that is elaborated by Keyword, qualified 8271 /// by the nested-name-specifier contained in SS, and that is (re)declared by 8272 /// OwnedTagDecl, which is nullptr if this is not a (re)declaration. 8273 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 8274 const CXXScopeSpec &SS, QualType T, 8275 TagDecl *OwnedTagDecl) { 8276 if (T.isNull()) 8277 return T; 8278 NestedNameSpecifier *NNS; 8279 if (SS.isValid()) 8280 NNS = SS.getScopeRep(); 8281 else { 8282 if (Keyword == ETK_None) 8283 return T; 8284 NNS = nullptr; 8285 } 8286 return Context.getElaboratedType(Keyword, NNS, T, OwnedTagDecl); 8287 } 8288 8289 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 8290 assert(!E->hasPlaceholderType() && "unexpected placeholder"); 8291 8292 if (!getLangOpts().CPlusPlus && E->refersToBitField()) 8293 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2; 8294 8295 if (!E->isTypeDependent()) { 8296 QualType T = E->getType(); 8297 if (const TagType *TT = T->getAs<TagType>()) 8298 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 8299 } 8300 return Context.getTypeOfExprType(E); 8301 } 8302 8303 /// getDecltypeForExpr - Given an expr, will return the decltype for 8304 /// that expression, according to the rules in C++11 8305 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 8306 static QualType getDecltypeForExpr(Sema &S, Expr *E) { 8307 if (E->isTypeDependent()) 8308 return S.Context.DependentTy; 8309 8310 // C++11 [dcl.type.simple]p4: 8311 // The type denoted by decltype(e) is defined as follows: 8312 // 8313 // - if e is an unparenthesized id-expression or an unparenthesized class 8314 // member access (5.2.5), decltype(e) is the type of the entity named 8315 // by e. If there is no such entity, or if e names a set of overloaded 8316 // functions, the program is ill-formed; 8317 // 8318 // We apply the same rules for Objective-C ivar and property references. 8319 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 8320 const ValueDecl *VD = DRE->getDecl(); 8321 return VD->getType(); 8322 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 8323 if (const ValueDecl *VD = ME->getMemberDecl()) 8324 if (isa<FieldDecl>(VD) || isa<VarDecl>(VD)) 8325 return VD->getType(); 8326 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 8327 return IR->getDecl()->getType(); 8328 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 8329 if (PR->isExplicitProperty()) 8330 return PR->getExplicitProperty()->getType(); 8331 } else if (auto *PE = dyn_cast<PredefinedExpr>(E)) { 8332 return PE->getType(); 8333 } 8334 8335 // C++11 [expr.lambda.prim]p18: 8336 // Every occurrence of decltype((x)) where x is a possibly 8337 // parenthesized id-expression that names an entity of automatic 8338 // storage duration is treated as if x were transformed into an 8339 // access to a corresponding data member of the closure type that 8340 // would have been declared if x were an odr-use of the denoted 8341 // entity. 8342 using namespace sema; 8343 if (S.getCurLambda()) { 8344 if (isa<ParenExpr>(E)) { 8345 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 8346 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 8347 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 8348 if (!T.isNull()) 8349 return S.Context.getLValueReferenceType(T); 8350 } 8351 } 8352 } 8353 } 8354 8355 8356 // C++11 [dcl.type.simple]p4: 8357 // [...] 8358 QualType T = E->getType(); 8359 switch (E->getValueKind()) { 8360 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 8361 // type of e; 8362 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 8363 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 8364 // type of e; 8365 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 8366 // - otherwise, decltype(e) is the type of e. 8367 case VK_RValue: break; 8368 } 8369 8370 return T; 8371 } 8372 8373 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc, 8374 bool AsUnevaluated) { 8375 assert(!E->hasPlaceholderType() && "unexpected placeholder"); 8376 8377 if (AsUnevaluated && CodeSynthesisContexts.empty() && 8378 E->HasSideEffects(Context, false)) { 8379 // The expression operand for decltype is in an unevaluated expression 8380 // context, so side effects could result in unintended consequences. 8381 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context); 8382 } 8383 8384 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 8385 } 8386 8387 QualType Sema::BuildUnaryTransformType(QualType BaseType, 8388 UnaryTransformType::UTTKind UKind, 8389 SourceLocation Loc) { 8390 switch (UKind) { 8391 case UnaryTransformType::EnumUnderlyingType: 8392 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 8393 Diag(Loc, diag::err_only_enums_have_underlying_types); 8394 return QualType(); 8395 } else { 8396 QualType Underlying = BaseType; 8397 if (!BaseType->isDependentType()) { 8398 // The enum could be incomplete if we're parsing its definition or 8399 // recovering from an error. 8400 NamedDecl *FwdDecl = nullptr; 8401 if (BaseType->isIncompleteType(&FwdDecl)) { 8402 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType; 8403 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl; 8404 return QualType(); 8405 } 8406 8407 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 8408 assert(ED && "EnumType has no EnumDecl"); 8409 8410 DiagnoseUseOfDecl(ED, Loc); 8411 8412 Underlying = ED->getIntegerType(); 8413 assert(!Underlying.isNull()); 8414 } 8415 return Context.getUnaryTransformType(BaseType, Underlying, 8416 UnaryTransformType::EnumUnderlyingType); 8417 } 8418 } 8419 llvm_unreachable("unknown unary transform type"); 8420 } 8421 8422 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 8423 if (!T->isDependentType()) { 8424 // FIXME: It isn't entirely clear whether incomplete atomic types 8425 // are allowed or not; for simplicity, ban them for the moment. 8426 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 8427 return QualType(); 8428 8429 int DisallowedKind = -1; 8430 if (T->isArrayType()) 8431 DisallowedKind = 1; 8432 else if (T->isFunctionType()) 8433 DisallowedKind = 2; 8434 else if (T->isReferenceType()) 8435 DisallowedKind = 3; 8436 else if (T->isAtomicType()) 8437 DisallowedKind = 4; 8438 else if (T.hasQualifiers()) 8439 DisallowedKind = 5; 8440 else if (!T.isTriviallyCopyableType(Context)) 8441 // Some other non-trivially-copyable type (probably a C++ class) 8442 DisallowedKind = 6; 8443 8444 if (DisallowedKind != -1) { 8445 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 8446 return QualType(); 8447 } 8448 8449 // FIXME: Do we need any handling for ARC here? 8450 } 8451 8452 // Build the pointer type. 8453 return Context.getAtomicType(T); 8454 } 8455